blob: 00d1c5a91e9db1b89459021e9d4cac59a96d742f [file] [log] [blame]
William Juulc051bbe2007-11-15 11:13:05 +01001/*
2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
3 *
Charles Manning3796e1f2012-05-09 16:55:17 +00004 * Copyright (C) 2002-2011 Aleph One Ltd.
William Juulc051bbe2007-11-15 11:13:05 +01005 * for Toby Churchill Ltd and Brightstar Engineering
6 *
7 * Created by Charles Manning <charles@aleph1.co.uk>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
William Juulc051bbe2007-11-15 11:13:05 +010014#include "yportenv.h"
Charles Manning3796e1f2012-05-09 16:55:17 +000015#include "yaffs_trace.h"
William Juulc051bbe2007-11-15 11:13:05 +010016
William Juulc051bbe2007-11-15 11:13:05 +010017#include "yaffs_guts.h"
Charles Manning3796e1f2012-05-09 16:55:17 +000018#include "yaffs_getblockinfo.h"
William Juulc051bbe2007-11-15 11:13:05 +010019#include "yaffs_tagscompat.h"
William Juulc051bbe2007-11-15 11:13:05 +010020#include "yaffs_nand.h"
Charles Manning3796e1f2012-05-09 16:55:17 +000021#include "yaffs_yaffs1.h"
22#include "yaffs_yaffs2.h"
23#include "yaffs_bitmap.h"
24#include "yaffs_verify.h"
William Juulc051bbe2007-11-15 11:13:05 +010025#include "yaffs_nand.h"
26#include "yaffs_packedtags2.h"
Charles Manning3796e1f2012-05-09 16:55:17 +000027#include "yaffs_nameval.h"
28#include "yaffs_allocator.h"
29#include "yaffs_attribs.h"
30#include "yaffs_summary.h"
William Juulc051bbe2007-11-15 11:13:05 +010031
Charles Manning3796e1f2012-05-09 16:55:17 +000032/* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
33#define YAFFS_GC_GOOD_ENOUGH 2
34#define YAFFS_GC_PASSIVE_THRESHOLD 4
William Juulc051bbe2007-11-15 11:13:05 +010035
36#include "yaffs_ecc.h"
37
Charles Manning3796e1f2012-05-09 16:55:17 +000038/* Forward declarations */
William Juulc051bbe2007-11-15 11:13:05 +010039
Charles Manning3796e1f2012-05-09 16:55:17 +000040static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
41 const u8 *buffer, int n_bytes, int use_reserve);
William Juulc051bbe2007-11-15 11:13:05 +010042
William Juulc051bbe2007-11-15 11:13:05 +010043
William Juulc051bbe2007-11-15 11:13:05 +010044
Charles Manning3796e1f2012-05-09 16:55:17 +000045/* Function to calculate chunk and offset */
William Juulc051bbe2007-11-15 11:13:05 +010046
Charles Manning3796e1f2012-05-09 16:55:17 +000047void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr,
48 int *chunk_out, u32 *offset_out)
49{
50 int chunk;
51 u32 offset;
William Juulc051bbe2007-11-15 11:13:05 +010052
Charles Manning3796e1f2012-05-09 16:55:17 +000053 chunk = (u32) (addr >> dev->chunk_shift);
William Juulc051bbe2007-11-15 11:13:05 +010054
Charles Manning3796e1f2012-05-09 16:55:17 +000055 if (dev->chunk_div == 1) {
56 /* easy power of 2 case */
57 offset = (u32) (addr & dev->chunk_mask);
58 } else {
59 /* Non power-of-2 case */
William Juulc051bbe2007-11-15 11:13:05 +010060
Charles Manning3796e1f2012-05-09 16:55:17 +000061 loff_t chunk_base;
William Juulc051bbe2007-11-15 11:13:05 +010062
Charles Manning3796e1f2012-05-09 16:55:17 +000063 chunk /= dev->chunk_div;
William Juulc051bbe2007-11-15 11:13:05 +010064
Charles Manning3796e1f2012-05-09 16:55:17 +000065 chunk_base = ((loff_t) chunk) * dev->data_bytes_per_chunk;
66 offset = (u32) (addr - chunk_base);
William Juulc051bbe2007-11-15 11:13:05 +010067 }
Charles Manning3796e1f2012-05-09 16:55:17 +000068
69 *chunk_out = chunk;
70 *offset_out = offset;
William Juulc051bbe2007-11-15 11:13:05 +010071}
72
Charles Manning3796e1f2012-05-09 16:55:17 +000073/* Function to return the number of shifts for a power of 2 greater than or
74 * equal to the given number
William Juulc051bbe2007-11-15 11:13:05 +010075 * Note we don't try to cater for all possible numbers and this does not have to
76 * be hellishly efficient.
77 */
Wolfgang Denk74e0dde2008-08-14 14:41:06 +020078
Charles Manning3796e1f2012-05-09 16:55:17 +000079static inline u32 calc_shifts_ceiling(u32 x)
William Juulc051bbe2007-11-15 11:13:05 +010080{
Charles Manning3796e1f2012-05-09 16:55:17 +000081 int extra_bits;
82 int shifts;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +020083
Charles Manning3796e1f2012-05-09 16:55:17 +000084 shifts = extra_bits = 0;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +020085
Charles Manning3796e1f2012-05-09 16:55:17 +000086 while (x > 1) {
87 if (x & 1)
88 extra_bits++;
89 x >>= 1;
90 shifts++;
William Juulc051bbe2007-11-15 11:13:05 +010091 }
92
Charles Manning3796e1f2012-05-09 16:55:17 +000093 if (extra_bits)
94 shifts++;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +020095
Charles Manning3796e1f2012-05-09 16:55:17 +000096 return shifts;
William Juulc051bbe2007-11-15 11:13:05 +010097}
98
99/* Function to return the number of shifts to get a 1 in bit 0
100 */
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200101
Charles Manning3796e1f2012-05-09 16:55:17 +0000102static inline u32 calc_shifts(u32 x)
William Juulc051bbe2007-11-15 11:13:05 +0100103{
Charles Manning3796e1f2012-05-09 16:55:17 +0000104 u32 shifts;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200105
Charles Manning3796e1f2012-05-09 16:55:17 +0000106 shifts = 0;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200107
Charles Manning3796e1f2012-05-09 16:55:17 +0000108 if (!x)
109 return 0;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200110
Charles Manning3796e1f2012-05-09 16:55:17 +0000111 while (!(x & 1)) {
112 x >>= 1;
113 shifts++;
William Juulc051bbe2007-11-15 11:13:05 +0100114 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200115
Charles Manning3796e1f2012-05-09 16:55:17 +0000116 return shifts;
William Juulc051bbe2007-11-15 11:13:05 +0100117}
118
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200119/*
William Juulc051bbe2007-11-15 11:13:05 +0100120 * Temporary buffer manipulations.
121 */
122
Charles Manning3796e1f2012-05-09 16:55:17 +0000123static int yaffs_init_tmp_buffers(struct yaffs_dev *dev)
William Juulc051bbe2007-11-15 11:13:05 +0100124{
125 int i;
Charles Manning3796e1f2012-05-09 16:55:17 +0000126 u8 *buf = (u8 *) 1;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200127
Charles Manning3796e1f2012-05-09 16:55:17 +0000128 memset(dev->temp_buffer, 0, sizeof(dev->temp_buffer));
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200129
William Juulc051bbe2007-11-15 11:13:05 +0100130 for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
Charles Manning3796e1f2012-05-09 16:55:17 +0000131 dev->temp_buffer[i].in_use = 0;
132 buf = kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
133 dev->temp_buffer[i].buffer = buf;
William Juulc051bbe2007-11-15 11:13:05 +0100134 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200135
William Juulc051bbe2007-11-15 11:13:05 +0100136 return buf ? YAFFS_OK : YAFFS_FAIL;
William Juulc051bbe2007-11-15 11:13:05 +0100137}
138
Charles Manning3796e1f2012-05-09 16:55:17 +0000139u8 *yaffs_get_temp_buffer(struct yaffs_dev * dev)
William Juulc051bbe2007-11-15 11:13:05 +0100140{
Charles Manning3796e1f2012-05-09 16:55:17 +0000141 int i;
William Juulc051bbe2007-11-15 11:13:05 +0100142
Charles Manning3796e1f2012-05-09 16:55:17 +0000143 dev->temp_in_use++;
144 if (dev->temp_in_use > dev->max_temp)
145 dev->max_temp = dev->temp_in_use;
William Juulc051bbe2007-11-15 11:13:05 +0100146
William Juulc051bbe2007-11-15 11:13:05 +0100147 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
Charles Manning3796e1f2012-05-09 16:55:17 +0000148 if (dev->temp_buffer[i].in_use == 0) {
149 dev->temp_buffer[i].in_use = 1;
150 return dev->temp_buffer[i].buffer;
151 }
William Juulc051bbe2007-11-15 11:13:05 +0100152 }
William Juulc051bbe2007-11-15 11:13:05 +0100153
Charles Manning3796e1f2012-05-09 16:55:17 +0000154 yaffs_trace(YAFFS_TRACE_BUFFERS, "Out of temp buffers");
William Juulc051bbe2007-11-15 11:13:05 +0100155 /*
156 * If we got here then we have to allocate an unmanaged one
157 * This is not good.
158 */
159
Charles Manning3796e1f2012-05-09 16:55:17 +0000160 dev->unmanaged_buffer_allocs++;
161 return kmalloc(dev->data_bytes_per_chunk, GFP_NOFS);
William Juulc051bbe2007-11-15 11:13:05 +0100162
163}
164
Charles Manning3796e1f2012-05-09 16:55:17 +0000165void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 *buffer)
William Juulc051bbe2007-11-15 11:13:05 +0100166{
167 int i;
Charles Manning3796e1f2012-05-09 16:55:17 +0000168
169 dev->temp_in_use--;
170
William Juulc051bbe2007-11-15 11:13:05 +0100171 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
Charles Manning3796e1f2012-05-09 16:55:17 +0000172 if (dev->temp_buffer[i].buffer == buffer) {
173 dev->temp_buffer[i].in_use = 0;
William Juulc051bbe2007-11-15 11:13:05 +0100174 return;
175 }
176 }
177
178 if (buffer) {
179 /* assume it is an unmanaged one. */
Charles Manning3796e1f2012-05-09 16:55:17 +0000180 yaffs_trace(YAFFS_TRACE_BUFFERS,
181 "Releasing unmanaged temp buffer");
182 kfree(buffer);
183 dev->unmanaged_buffer_deallocs++;
William Juulc051bbe2007-11-15 11:13:05 +0100184 }
185
186}
187
188/*
189 * Determine if we have a managed buffer.
190 */
Charles Manning3796e1f2012-05-09 16:55:17 +0000191int yaffs_is_managed_tmp_buffer(struct yaffs_dev *dev, const u8 *buffer)
William Juulc051bbe2007-11-15 11:13:05 +0100192{
193 int i;
Charles Manning3796e1f2012-05-09 16:55:17 +0000194
William Juulc051bbe2007-11-15 11:13:05 +0100195 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
Charles Manning3796e1f2012-05-09 16:55:17 +0000196 if (dev->temp_buffer[i].buffer == buffer)
William Juulc051bbe2007-11-15 11:13:05 +0100197 return 1;
William Juulc051bbe2007-11-15 11:13:05 +0100198 }
199
Charles Manning3796e1f2012-05-09 16:55:17 +0000200 for (i = 0; i < dev->param.n_caches; i++) {
201 if (dev->cache[i].data == buffer)
202 return 1;
203 }
William Juulc051bbe2007-11-15 11:13:05 +0100204
Charles Manning3796e1f2012-05-09 16:55:17 +0000205 if (buffer == dev->checkpt_buffer)
206 return 1;
William Juulc051bbe2007-11-15 11:13:05 +0100207
Charles Manning3796e1f2012-05-09 16:55:17 +0000208 yaffs_trace(YAFFS_TRACE_ALWAYS,
209 "yaffs: unmaged buffer detected.");
210 return 0;
William Juulc051bbe2007-11-15 11:13:05 +0100211}
212
William Juulc051bbe2007-11-15 11:13:05 +0100213/*
Charles Manning3796e1f2012-05-09 16:55:17 +0000214 * Functions for robustisizing TODO
215 *
William Juulc051bbe2007-11-15 11:13:05 +0100216 */
217
Charles Manning3796e1f2012-05-09 16:55:17 +0000218static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk,
219 const u8 *data,
220 const struct yaffs_ext_tags *tags)
William Juulc051bbe2007-11-15 11:13:05 +0100221{
Charles Manning3796e1f2012-05-09 16:55:17 +0000222 dev = dev;
223 nand_chunk = nand_chunk;
224 data = data;
225 tags = tags;
William Juulc051bbe2007-11-15 11:13:05 +0100226}
227
Charles Manning3796e1f2012-05-09 16:55:17 +0000228static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk,
229 const struct yaffs_ext_tags *tags)
William Juulc051bbe2007-11-15 11:13:05 +0100230{
Charles Manning3796e1f2012-05-09 16:55:17 +0000231 dev = dev;
232 nand_chunk = nand_chunk;
233 tags = tags;
William Juulc051bbe2007-11-15 11:13:05 +0100234}
235
Charles Manning3796e1f2012-05-09 16:55:17 +0000236void yaffs_handle_chunk_error(struct yaffs_dev *dev,
237 struct yaffs_block_info *bi)
William Juulc051bbe2007-11-15 11:13:05 +0100238{
Charles Manning3796e1f2012-05-09 16:55:17 +0000239 if (!bi->gc_prioritise) {
240 bi->gc_prioritise = 1;
241 dev->has_pending_prioritised_gc = 1;
242 bi->chunk_error_strikes++;
William Juulc051bbe2007-11-15 11:13:05 +0100243
Charles Manning3796e1f2012-05-09 16:55:17 +0000244 if (bi->chunk_error_strikes > 3) {
245 bi->needs_retiring = 1; /* Too many stikes, so retire */
246 yaffs_trace(YAFFS_TRACE_ALWAYS,
247 "yaffs: Block struck out");
248
249 }
250 }
William Juulc051bbe2007-11-15 11:13:05 +0100251}
252
Charles Manning3796e1f2012-05-09 16:55:17 +0000253static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk,
254 int erased_ok)
William Juulc051bbe2007-11-15 11:13:05 +0100255{
Charles Manning3796e1f2012-05-09 16:55:17 +0000256 int flash_block = nand_chunk / dev->param.chunks_per_block;
257 struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
William Juulc051bbe2007-11-15 11:13:05 +0100258
Charles Manning3796e1f2012-05-09 16:55:17 +0000259 yaffs_handle_chunk_error(dev, bi);
William Juulc051bbe2007-11-15 11:13:05 +0100260
Charles Manning3796e1f2012-05-09 16:55:17 +0000261 if (erased_ok) {
262 /* Was an actual write failure,
263 * so mark the block for retirement.*/
264 bi->needs_retiring = 1;
265 yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
266 "**>> Block %d needs retiring", flash_block);
267 }
William Juulc051bbe2007-11-15 11:13:05 +0100268
Charles Manning3796e1f2012-05-09 16:55:17 +0000269 /* Delete the chunk */
270 yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
271 yaffs_skip_rest_of_block(dev);
272}
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200273
Charles Manning3796e1f2012-05-09 16:55:17 +0000274/*
275 * Verification code
276 */
William Juulc051bbe2007-11-15 11:13:05 +0100277
Charles Manning3796e1f2012-05-09 16:55:17 +0000278/*
279 * Simple hash function. Needs to have a reasonable spread
280 */
William Juulc051bbe2007-11-15 11:13:05 +0100281
Charles Manning3796e1f2012-05-09 16:55:17 +0000282static inline int yaffs_hash_fn(int n)
William Juulc051bbe2007-11-15 11:13:05 +0100283{
Charles Manning3796e1f2012-05-09 16:55:17 +0000284 if (n < 0)
285 n = -n;
286 return n % YAFFS_NOBJECT_BUCKETS;
William Juulc051bbe2007-11-15 11:13:05 +0100287}
288
Charles Manning3796e1f2012-05-09 16:55:17 +0000289/*
290 * Access functions to useful fake objects.
291 * Note that root might have a presence in NAND if permissions are set.
292 */
293
294struct yaffs_obj *yaffs_root(struct yaffs_dev *dev)
William Juulc051bbe2007-11-15 11:13:05 +0100295{
Charles Manning3796e1f2012-05-09 16:55:17 +0000296 return dev->root_dir;
William Juulc051bbe2007-11-15 11:13:05 +0100297}
298
Charles Manning3796e1f2012-05-09 16:55:17 +0000299struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev)
William Juulc051bbe2007-11-15 11:13:05 +0100300{
Charles Manning3796e1f2012-05-09 16:55:17 +0000301 return dev->lost_n_found;
William Juulc051bbe2007-11-15 11:13:05 +0100302}
303
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200304/*
Charles Manning3796e1f2012-05-09 16:55:17 +0000305 * Erased NAND checking functions
William Juulc051bbe2007-11-15 11:13:05 +0100306 */
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200307
Charles Manning3796e1f2012-05-09 16:55:17 +0000308int yaffs_check_ff(u8 *buffer, int n_bytes)
William Juulc051bbe2007-11-15 11:13:05 +0100309{
Charles Manning3796e1f2012-05-09 16:55:17 +0000310 /* Horrible, slow implementation */
311 while (n_bytes--) {
312 if (*buffer != 0xff)
313 return 0;
314 buffer++;
315 }
316 return 1;
William Juulc051bbe2007-11-15 11:13:05 +0100317}
318
Charles Manning3796e1f2012-05-09 16:55:17 +0000319static int yaffs_check_chunk_erased(struct yaffs_dev *dev, int nand_chunk)
William Juulc051bbe2007-11-15 11:13:05 +0100320{
Charles Manning3796e1f2012-05-09 16:55:17 +0000321 int retval = YAFFS_OK;
322 u8 *data = yaffs_get_temp_buffer(dev);
323 struct yaffs_ext_tags tags;
324 int result;
325
326 result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, data, &tags);
327
328 if (tags.ecc_result > YAFFS_ECC_RESULT_NO_ERROR)
329 retval = YAFFS_FAIL;
330
331 if (!yaffs_check_ff(data, dev->data_bytes_per_chunk) ||
332 tags.chunk_used) {
333 yaffs_trace(YAFFS_TRACE_NANDACCESS,
334 "Chunk %d not erased", nand_chunk);
335 retval = YAFFS_FAIL;
336 }
337
338 yaffs_release_temp_buffer(dev, data);
339
340 return retval;
341
William Juulc051bbe2007-11-15 11:13:05 +0100342}
343
Charles Manning3796e1f2012-05-09 16:55:17 +0000344static int yaffs_verify_chunk_written(struct yaffs_dev *dev,
345 int nand_chunk,
346 const u8 *data,
347 struct yaffs_ext_tags *tags)
William Juulc051bbe2007-11-15 11:13:05 +0100348{
Charles Manning3796e1f2012-05-09 16:55:17 +0000349 int retval = YAFFS_OK;
350 struct yaffs_ext_tags temp_tags;
351 u8 *buffer = yaffs_get_temp_buffer(dev);
352 int result;
353
354 result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, buffer, &temp_tags);
355 if (memcmp(buffer, data, dev->data_bytes_per_chunk) ||
356 temp_tags.obj_id != tags->obj_id ||
357 temp_tags.chunk_id != tags->chunk_id ||
358 temp_tags.n_bytes != tags->n_bytes)
359 retval = YAFFS_FAIL;
360
361 yaffs_release_temp_buffer(dev, buffer);
362
363 return retval;
William Juulc051bbe2007-11-15 11:13:05 +0100364}
365
William Juulc051bbe2007-11-15 11:13:05 +0100366
Charles Manning3796e1f2012-05-09 16:55:17 +0000367int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks)
William Juulc051bbe2007-11-15 11:13:05 +0100368{
Charles Manning3796e1f2012-05-09 16:55:17 +0000369 int reserved_chunks;
370 int reserved_blocks = dev->param.n_reserved_blocks;
371 int checkpt_blocks;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200372
Charles Manning3796e1f2012-05-09 16:55:17 +0000373 checkpt_blocks = yaffs_calc_checkpt_blocks_required(dev);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200374
Charles Manning3796e1f2012-05-09 16:55:17 +0000375 reserved_chunks =
376 (reserved_blocks + checkpt_blocks) * dev->param.chunks_per_block;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200377
Charles Manning3796e1f2012-05-09 16:55:17 +0000378 return (dev->n_free_chunks > (reserved_chunks + n_chunks));
379}
380
381static int yaffs_find_alloc_block(struct yaffs_dev *dev)
382{
383 int i;
384 struct yaffs_block_info *bi;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200385
Charles Manning3796e1f2012-05-09 16:55:17 +0000386 if (dev->n_erased_blocks < 1) {
387 /* Hoosterman we've got a problem.
388 * Can't get space to gc
389 */
390 yaffs_trace(YAFFS_TRACE_ERROR,
391 "yaffs tragedy: no more erased blocks");
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200392
Charles Manning3796e1f2012-05-09 16:55:17 +0000393 return -1;
394 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200395
Charles Manning3796e1f2012-05-09 16:55:17 +0000396 /* Find an empty block. */
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200397
Charles Manning3796e1f2012-05-09 16:55:17 +0000398 for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
399 dev->alloc_block_finder++;
400 if (dev->alloc_block_finder < dev->internal_start_block
401 || dev->alloc_block_finder > dev->internal_end_block) {
402 dev->alloc_block_finder = dev->internal_start_block;
403 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200404
Charles Manning3796e1f2012-05-09 16:55:17 +0000405 bi = yaffs_get_block_info(dev, dev->alloc_block_finder);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200406
Charles Manning3796e1f2012-05-09 16:55:17 +0000407 if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
408 bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING;
409 dev->seq_number++;
410 bi->seq_number = dev->seq_number;
411 dev->n_erased_blocks--;
412 yaffs_trace(YAFFS_TRACE_ALLOCATE,
413 "Allocated block %d, seq %d, %d left" ,
414 dev->alloc_block_finder, dev->seq_number,
415 dev->n_erased_blocks);
416 return dev->alloc_block_finder;
417 }
418 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200419
Charles Manning3796e1f2012-05-09 16:55:17 +0000420 yaffs_trace(YAFFS_TRACE_ALWAYS,
421 "yaffs tragedy: no more erased blocks, but there should have been %d",
422 dev->n_erased_blocks);
423
424 return -1;
William Juulc051bbe2007-11-15 11:13:05 +0100425}
426
Charles Manning3796e1f2012-05-09 16:55:17 +0000427static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver,
428 struct yaffs_block_info **block_ptr)
William Juulc051bbe2007-11-15 11:13:05 +0100429{
Charles Manning3796e1f2012-05-09 16:55:17 +0000430 int ret_val;
431 struct yaffs_block_info *bi;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200432
Charles Manning3796e1f2012-05-09 16:55:17 +0000433 if (dev->alloc_block < 0) {
434 /* Get next block to allocate off */
435 dev->alloc_block = yaffs_find_alloc_block(dev);
436 dev->alloc_page = 0;
437 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200438
Charles Manning3796e1f2012-05-09 16:55:17 +0000439 if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) {
440 /* No space unless we're allowed to use the reserve. */
441 return -1;
William Juulc051bbe2007-11-15 11:13:05 +0100442 }
William Juulc051bbe2007-11-15 11:13:05 +0100443
Charles Manning3796e1f2012-05-09 16:55:17 +0000444 if (dev->n_erased_blocks < dev->param.n_reserved_blocks
445 && dev->alloc_page == 0)
446 yaffs_trace(YAFFS_TRACE_ALLOCATE, "Allocating reserve");
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200447
Charles Manning3796e1f2012-05-09 16:55:17 +0000448 /* Next page please.... */
449 if (dev->alloc_block >= 0) {
450 bi = yaffs_get_block_info(dev, dev->alloc_block);
William Juulc051bbe2007-11-15 11:13:05 +0100451
Charles Manning3796e1f2012-05-09 16:55:17 +0000452 ret_val = (dev->alloc_block * dev->param.chunks_per_block) +
453 dev->alloc_page;
454 bi->pages_in_use++;
455 yaffs_set_chunk_bit(dev, dev->alloc_block, dev->alloc_page);
William Juulc051bbe2007-11-15 11:13:05 +0100456
Charles Manning3796e1f2012-05-09 16:55:17 +0000457 dev->alloc_page++;
William Juulc051bbe2007-11-15 11:13:05 +0100458
Charles Manning3796e1f2012-05-09 16:55:17 +0000459 dev->n_free_chunks--;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200460
Charles Manning3796e1f2012-05-09 16:55:17 +0000461 /* If the block is full set the state to full */
462 if (dev->alloc_page >= dev->param.chunks_per_block) {
463 bi->block_state = YAFFS_BLOCK_STATE_FULL;
464 dev->alloc_block = -1;
465 }
William Juulc051bbe2007-11-15 11:13:05 +0100466
Charles Manning3796e1f2012-05-09 16:55:17 +0000467 if (block_ptr)
468 *block_ptr = bi;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200469
Charles Manning3796e1f2012-05-09 16:55:17 +0000470 return ret_val;
William Juulc051bbe2007-11-15 11:13:05 +0100471 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200472
Charles Manning3796e1f2012-05-09 16:55:17 +0000473 yaffs_trace(YAFFS_TRACE_ERROR,
474 "!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!");
William Juulc051bbe2007-11-15 11:13:05 +0100475
Charles Manning3796e1f2012-05-09 16:55:17 +0000476 return -1;
477}
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200478
Charles Manning3796e1f2012-05-09 16:55:17 +0000479static int yaffs_get_erased_chunks(struct yaffs_dev *dev)
480{
481 int n;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200482
Charles Manning3796e1f2012-05-09 16:55:17 +0000483 n = dev->n_erased_blocks * dev->param.chunks_per_block;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200484
Charles Manning3796e1f2012-05-09 16:55:17 +0000485 if (dev->alloc_block > 0)
486 n += (dev->param.chunks_per_block - dev->alloc_page);
William Juulc051bbe2007-11-15 11:13:05 +0100487
Charles Manning3796e1f2012-05-09 16:55:17 +0000488 return n;
William Juulc051bbe2007-11-15 11:13:05 +0100489
490}
491
492/*
Charles Manning3796e1f2012-05-09 16:55:17 +0000493 * yaffs_skip_rest_of_block() skips over the rest of the allocation block
494 * if we don't want to write to it.
William Juulc051bbe2007-11-15 11:13:05 +0100495 */
Charles Manning3796e1f2012-05-09 16:55:17 +0000496void yaffs_skip_rest_of_block(struct yaffs_dev *dev)
William Juulc051bbe2007-11-15 11:13:05 +0100497{
Charles Manning3796e1f2012-05-09 16:55:17 +0000498 struct yaffs_block_info *bi;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200499
Charles Manning3796e1f2012-05-09 16:55:17 +0000500 if (dev->alloc_block > 0) {
501 bi = yaffs_get_block_info(dev, dev->alloc_block);
502 if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) {
503 bi->block_state = YAFFS_BLOCK_STATE_FULL;
504 dev->alloc_block = -1;
505 }
William Juulc051bbe2007-11-15 11:13:05 +0100506 }
Charles Manning3796e1f2012-05-09 16:55:17 +0000507}
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200508
Charles Manning3796e1f2012-05-09 16:55:17 +0000509static int yaffs_write_new_chunk(struct yaffs_dev *dev,
510 const u8 *data,
511 struct yaffs_ext_tags *tags, int use_reserver)
512{
513 int attempts = 0;
514 int write_ok = 0;
515 int chunk;
William Juulc051bbe2007-11-15 11:13:05 +0100516
Charles Manning3796e1f2012-05-09 16:55:17 +0000517 yaffs2_checkpt_invalidate(dev);
William Juulc051bbe2007-11-15 11:13:05 +0100518
Charles Manning3796e1f2012-05-09 16:55:17 +0000519 do {
520 struct yaffs_block_info *bi = 0;
521 int erased_ok = 0;
William Juulc051bbe2007-11-15 11:13:05 +0100522
Charles Manning3796e1f2012-05-09 16:55:17 +0000523 chunk = yaffs_alloc_chunk(dev, use_reserver, &bi);
524 if (chunk < 0) {
525 /* no space */
526 break;
527 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200528
Charles Manning3796e1f2012-05-09 16:55:17 +0000529 /* First check this chunk is erased, if it needs
530 * checking. The checking policy (unless forced
531 * always on) is as follows:
532 *
533 * Check the first page we try to write in a block.
534 * If the check passes then we don't need to check any
535 * more. If the check fails, we check again...
536 * If the block has been erased, we don't need to check.
537 *
538 * However, if the block has been prioritised for gc,
539 * then we think there might be something odd about
540 * this block and stop using it.
541 *
542 * Rationale: We should only ever see chunks that have
543 * not been erased if there was a partially written
544 * chunk due to power loss. This checking policy should
545 * catch that case with very few checks and thus save a
546 * lot of checks that are most likely not needed.
547 *
548 * Mods to the above
549 * If an erase check fails or the write fails we skip the
550 * rest of the block.
551 */
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200552
Charles Manning3796e1f2012-05-09 16:55:17 +0000553 /* let's give it a try */
554 attempts++;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200555
Charles Manning3796e1f2012-05-09 16:55:17 +0000556 if (dev->param.always_check_erased)
557 bi->skip_erased_check = 0;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200558
Charles Manning3796e1f2012-05-09 16:55:17 +0000559 if (!bi->skip_erased_check) {
560 erased_ok = yaffs_check_chunk_erased(dev, chunk);
561 if (erased_ok != YAFFS_OK) {
562 yaffs_trace(YAFFS_TRACE_ERROR,
563 "**>> yaffs chunk %d was not erased",
564 chunk);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200565
Charles Manning3796e1f2012-05-09 16:55:17 +0000566 /* If not erased, delete this one,
567 * skip rest of block and
568 * try another chunk */
569 yaffs_chunk_del(dev, chunk, 1, __LINE__);
570 yaffs_skip_rest_of_block(dev);
571 continue;
572 }
573 }
William Juulc051bbe2007-11-15 11:13:05 +0100574
Charles Manning3796e1f2012-05-09 16:55:17 +0000575 write_ok = yaffs_wr_chunk_tags_nand(dev, chunk, data, tags);
William Juulc051bbe2007-11-15 11:13:05 +0100576
Charles Manning3796e1f2012-05-09 16:55:17 +0000577 if (!bi->skip_erased_check)
578 write_ok =
579 yaffs_verify_chunk_written(dev, chunk, data, tags);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200580
Charles Manning3796e1f2012-05-09 16:55:17 +0000581 if (write_ok != YAFFS_OK) {
582 /* Clean up aborted write, skip to next block and
583 * try another chunk */
584 yaffs_handle_chunk_wr_error(dev, chunk, erased_ok);
585 continue;
586 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200587
Charles Manning3796e1f2012-05-09 16:55:17 +0000588 bi->skip_erased_check = 1;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200589
Charles Manning3796e1f2012-05-09 16:55:17 +0000590 /* Copy the data into the robustification buffer */
591 yaffs_handle_chunk_wr_ok(dev, chunk, data, tags);
592
593 } while (write_ok != YAFFS_OK &&
594 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
595
596 if (!write_ok)
597 chunk = -1;
598
599 if (attempts > 1) {
600 yaffs_trace(YAFFS_TRACE_ERROR,
601 "**>> yaffs write required %d attempts",
602 attempts);
603 dev->n_retried_writes += (attempts - 1);
William Juulc051bbe2007-11-15 11:13:05 +0100604 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200605
Charles Manning3796e1f2012-05-09 16:55:17 +0000606 return chunk;
607}
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200608
Charles Manning3796e1f2012-05-09 16:55:17 +0000609/*
610 * Block retiring for handling a broken block.
611 */
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200612
Charles Manning3796e1f2012-05-09 16:55:17 +0000613static void yaffs_retire_block(struct yaffs_dev *dev, int flash_block)
614{
615 struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200616
Charles Manning3796e1f2012-05-09 16:55:17 +0000617 yaffs2_checkpt_invalidate(dev);
William Juulc051bbe2007-11-15 11:13:05 +0100618
Charles Manning3796e1f2012-05-09 16:55:17 +0000619 yaffs2_clear_oldest_dirty_seq(dev, bi);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200620
Charles Manning3796e1f2012-05-09 16:55:17 +0000621 if (yaffs_mark_bad(dev, flash_block) != YAFFS_OK) {
622 if (yaffs_erase_block(dev, flash_block) != YAFFS_OK) {
623 yaffs_trace(YAFFS_TRACE_ALWAYS,
624 "yaffs: Failed to mark bad and erase block %d",
625 flash_block);
626 } else {
627 struct yaffs_ext_tags tags;
628 int chunk_id =
629 flash_block * dev->param.chunks_per_block;
William Juulc051bbe2007-11-15 11:13:05 +0100630
Charles Manning3796e1f2012-05-09 16:55:17 +0000631 u8 *buffer = yaffs_get_temp_buffer(dev);
William Juulc051bbe2007-11-15 11:13:05 +0100632
Charles Manning3796e1f2012-05-09 16:55:17 +0000633 memset(buffer, 0xff, dev->data_bytes_per_chunk);
634 memset(&tags, 0, sizeof(tags));
635 tags.seq_number = YAFFS_SEQUENCE_BAD_BLOCK;
636 if (dev->param.write_chunk_tags_fn(dev, chunk_id -
637 dev->chunk_offset,
638 buffer,
639 &tags) != YAFFS_OK)
640 yaffs_trace(YAFFS_TRACE_ALWAYS,
641 "yaffs: Failed to write bad block marker to block %d",
642 flash_block);
643
644 yaffs_release_temp_buffer(dev, buffer);
645 }
William Juulc051bbe2007-11-15 11:13:05 +0100646 }
647
Charles Manning3796e1f2012-05-09 16:55:17 +0000648 bi->block_state = YAFFS_BLOCK_STATE_DEAD;
649 bi->gc_prioritise = 0;
650 bi->needs_retiring = 0;
651
652 dev->n_retired_blocks++;
William Juulc051bbe2007-11-15 11:13:05 +0100653}
654
Charles Manning3796e1f2012-05-09 16:55:17 +0000655/*---------------- Name handling functions ------------*/
656
657static u16 yaffs_calc_name_sum(const YCHAR *name)
William Juulc051bbe2007-11-15 11:13:05 +0100658{
Charles Manning3796e1f2012-05-09 16:55:17 +0000659 u16 sum = 0;
660 u16 i = 1;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200661
Charles Manning3796e1f2012-05-09 16:55:17 +0000662 if (!name)
663 return 0;
William Juulc051bbe2007-11-15 11:13:05 +0100664
Charles Manning3796e1f2012-05-09 16:55:17 +0000665 while ((*name) && i < (YAFFS_MAX_NAME_LENGTH / 2)) {
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200666
Charles Manning3796e1f2012-05-09 16:55:17 +0000667 /* 0x1f mask is case insensitive */
668 sum += ((*name) & 0x1f) * i;
669 i++;
670 name++;
671 }
672 return sum;
William Juulc051bbe2007-11-15 11:13:05 +0100673}
674
Charles Manning3796e1f2012-05-09 16:55:17 +0000675void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR * name)
William Juulc051bbe2007-11-15 11:13:05 +0100676{
Charles Manning3796e1f2012-05-09 16:55:17 +0000677 memset(obj->short_name, 0, sizeof(obj->short_name));
678 if (name &&
679 yaffs_strnlen(name, YAFFS_SHORT_NAME_LENGTH + 1) <=
680 YAFFS_SHORT_NAME_LENGTH)
681 yaffs_strcpy(obj->short_name, name);
682 else
683 obj->short_name[0] = _Y('\0');
684 obj->sum = yaffs_calc_name_sum(name);
685}
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200686
Charles Manning3796e1f2012-05-09 16:55:17 +0000687void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj,
688 const struct yaffs_obj_hdr *oh)
689{
690#ifdef CONFIG_YAFFS_AUTO_UNICODE
691 YCHAR tmp_name[YAFFS_MAX_NAME_LENGTH + 1];
692 memset(tmp_name, 0, sizeof(tmp_name));
693 yaffs_load_name_from_oh(obj->my_dev, tmp_name, oh->name,
694 YAFFS_MAX_NAME_LENGTH + 1);
695 yaffs_set_obj_name(obj, tmp_name);
696#else
697 yaffs_set_obj_name(obj, oh->name);
698#endif
William Juulc051bbe2007-11-15 11:13:05 +0100699}
700
Charles Manning3796e1f2012-05-09 16:55:17 +0000701loff_t yaffs_max_file_size(struct yaffs_dev *dev)
William Juulc051bbe2007-11-15 11:13:05 +0100702{
Charles Manning3796e1f2012-05-09 16:55:17 +0000703 return ((loff_t) YAFFS_MAX_CHUNK_ID) * dev->data_bytes_per_chunk;
William Juulc051bbe2007-11-15 11:13:05 +0100704}
705
Charles Manning3796e1f2012-05-09 16:55:17 +0000706/*-------------------- TNODES -------------------
707
708 * List of spare tnodes
709 * The list is hooked together using the first pointer
710 * in the tnode.
711 */
712
713struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev)
William Juulc051bbe2007-11-15 11:13:05 +0100714{
Charles Manning3796e1f2012-05-09 16:55:17 +0000715 struct yaffs_tnode *tn = yaffs_alloc_raw_tnode(dev);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200716
Charles Manning3796e1f2012-05-09 16:55:17 +0000717 if (tn) {
718 memset(tn, 0, dev->tnode_size);
719 dev->n_tnodes++;
720 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200721
Charles Manning3796e1f2012-05-09 16:55:17 +0000722 dev->checkpoint_blocks_required = 0; /* force recalculation */
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200723
Charles Manning3796e1f2012-05-09 16:55:17 +0000724 return tn;
725}
726
727/* FreeTnode frees up a tnode and puts it back on the free list */
728static void yaffs_free_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
729{
730 yaffs_free_raw_tnode(dev, tn);
731 dev->n_tnodes--;
732 dev->checkpoint_blocks_required = 0; /* force recalculation */
733}
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200734
Charles Manning3796e1f2012-05-09 16:55:17 +0000735static void yaffs_deinit_tnodes_and_objs(struct yaffs_dev *dev)
736{
737 yaffs_deinit_raw_tnodes_and_objs(dev);
738 dev->n_obj = 0;
739 dev->n_tnodes = 0;
740}
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200741
Charles Manning3796e1f2012-05-09 16:55:17 +0000742void yaffs_load_tnode_0(struct yaffs_dev *dev, struct yaffs_tnode *tn,
743 unsigned pos, unsigned val)
744{
745 u32 *map = (u32 *) tn;
746 u32 bit_in_map;
747 u32 bit_in_word;
748 u32 word_in_map;
749 u32 mask;
750
751 pos &= YAFFS_TNODES_LEVEL0_MASK;
752 val >>= dev->chunk_grp_bits;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200753
Charles Manning3796e1f2012-05-09 16:55:17 +0000754 bit_in_map = pos * dev->tnode_width;
755 word_in_map = bit_in_map / 32;
756 bit_in_word = bit_in_map & (32 - 1);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200757
Charles Manning3796e1f2012-05-09 16:55:17 +0000758 mask = dev->tnode_mask << bit_in_word;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200759
Charles Manning3796e1f2012-05-09 16:55:17 +0000760 map[word_in_map] &= ~mask;
761 map[word_in_map] |= (mask & (val << bit_in_word));
762
763 if (dev->tnode_width > (32 - bit_in_word)) {
764 bit_in_word = (32 - bit_in_word);
765 word_in_map++;
766 mask =
767 dev->tnode_mask >> bit_in_word;
768 map[word_in_map] &= ~mask;
769 map[word_in_map] |= (mask & (val >> bit_in_word));
William Juulc051bbe2007-11-15 11:13:05 +0100770 }
Charles Manning3796e1f2012-05-09 16:55:17 +0000771}
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200772
Charles Manning3796e1f2012-05-09 16:55:17 +0000773u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn,
774 unsigned pos)
775{
776 u32 *map = (u32 *) tn;
777 u32 bit_in_map;
778 u32 bit_in_word;
779 u32 word_in_map;
780 u32 val;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200781
Charles Manning3796e1f2012-05-09 16:55:17 +0000782 pos &= YAFFS_TNODES_LEVEL0_MASK;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200783
Charles Manning3796e1f2012-05-09 16:55:17 +0000784 bit_in_map = pos * dev->tnode_width;
785 word_in_map = bit_in_map / 32;
786 bit_in_word = bit_in_map & (32 - 1);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200787
Charles Manning3796e1f2012-05-09 16:55:17 +0000788 val = map[word_in_map] >> bit_in_word;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200789
Charles Manning3796e1f2012-05-09 16:55:17 +0000790 if (dev->tnode_width > (32 - bit_in_word)) {
791 bit_in_word = (32 - bit_in_word);
792 word_in_map++;
793 val |= (map[word_in_map] << bit_in_word);
William Juulc051bbe2007-11-15 11:13:05 +0100794 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200795
Charles Manning3796e1f2012-05-09 16:55:17 +0000796 val &= dev->tnode_mask;
797 val <<= dev->chunk_grp_bits;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200798
Charles Manning3796e1f2012-05-09 16:55:17 +0000799 return val;
800}
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200801
Charles Manning3796e1f2012-05-09 16:55:17 +0000802/* ------------------- End of individual tnode manipulation -----------------*/
William Juulc051bbe2007-11-15 11:13:05 +0100803
Charles Manning3796e1f2012-05-09 16:55:17 +0000804/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
805 * The look up tree is represented by the top tnode and the number of top_level
806 * in the tree. 0 means only the level 0 tnode is in the tree.
William Juulc051bbe2007-11-15 11:13:05 +0100807 */
William Juulc051bbe2007-11-15 11:13:05 +0100808
Charles Manning3796e1f2012-05-09 16:55:17 +0000809/* FindLevel0Tnode finds the level 0 tnode, if one exists. */
810struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev,
811 struct yaffs_file_var *file_struct,
812 u32 chunk_id)
813{
814 struct yaffs_tnode *tn = file_struct->top;
815 u32 i;
816 int required_depth;
817 int level = file_struct->top_level;
William Juulc051bbe2007-11-15 11:13:05 +0100818
Charles Manning3796e1f2012-05-09 16:55:17 +0000819 dev = dev;
William Juulc051bbe2007-11-15 11:13:05 +0100820
Charles Manning3796e1f2012-05-09 16:55:17 +0000821 /* Check sane level and chunk Id */
822 if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
823 return NULL;
William Juulc051bbe2007-11-15 11:13:05 +0100824
Charles Manning3796e1f2012-05-09 16:55:17 +0000825 if (chunk_id > YAFFS_MAX_CHUNK_ID)
826 return NULL;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200827
Charles Manning3796e1f2012-05-09 16:55:17 +0000828 /* First check we're tall enough (ie enough top_level) */
William Juulc051bbe2007-11-15 11:13:05 +0100829
Charles Manning3796e1f2012-05-09 16:55:17 +0000830 i = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
831 required_depth = 0;
832 while (i) {
833 i >>= YAFFS_TNODES_INTERNAL_BITS;
834 required_depth++;
835 }
William Juulc051bbe2007-11-15 11:13:05 +0100836
Charles Manning3796e1f2012-05-09 16:55:17 +0000837 if (required_depth > file_struct->top_level)
838 return NULL; /* Not tall enough, so we can't find it */
William Juulc051bbe2007-11-15 11:13:05 +0100839
Charles Manning3796e1f2012-05-09 16:55:17 +0000840 /* Traverse down to level 0 */
841 while (level > 0 && tn) {
842 tn = tn->internal[(chunk_id >>
843 (YAFFS_TNODES_LEVEL0_BITS +
844 (level - 1) *
845 YAFFS_TNODES_INTERNAL_BITS)) &
846 YAFFS_TNODES_INTERNAL_MASK];
847 level--;
848 }
William Juulc051bbe2007-11-15 11:13:05 +0100849
Charles Manning3796e1f2012-05-09 16:55:17 +0000850 return tn;
851}
William Juulc051bbe2007-11-15 11:13:05 +0100852
Charles Manning3796e1f2012-05-09 16:55:17 +0000853/* add_find_tnode_0 finds the level 0 tnode if it exists,
854 * otherwise first expands the tree.
855 * This happens in two steps:
856 * 1. If the tree isn't tall enough, then make it taller.
857 * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
858 *
859 * Used when modifying the tree.
860 *
861 * If the tn argument is NULL, then a fresh tnode will be added otherwise the
862 * specified tn will be plugged into the ttree.
863 */
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200864
Charles Manning3796e1f2012-05-09 16:55:17 +0000865struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev,
866 struct yaffs_file_var *file_struct,
867 u32 chunk_id,
868 struct yaffs_tnode *passed_tn)
869{
870 int required_depth;
871 int i;
872 int l;
873 struct yaffs_tnode *tn;
874 u32 x;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200875
Charles Manning3796e1f2012-05-09 16:55:17 +0000876 /* Check sane level and page Id */
877 if (file_struct->top_level < 0 ||
878 file_struct->top_level > YAFFS_TNODES_MAX_LEVEL)
879 return NULL;
William Juulc051bbe2007-11-15 11:13:05 +0100880
Charles Manning3796e1f2012-05-09 16:55:17 +0000881 if (chunk_id > YAFFS_MAX_CHUNK_ID)
882 return NULL;
William Juulc051bbe2007-11-15 11:13:05 +0100883
Charles Manning3796e1f2012-05-09 16:55:17 +0000884 /* First check we're tall enough (ie enough top_level) */
William Juulc051bbe2007-11-15 11:13:05 +0100885
Charles Manning3796e1f2012-05-09 16:55:17 +0000886 x = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
887 required_depth = 0;
888 while (x) {
889 x >>= YAFFS_TNODES_INTERNAL_BITS;
890 required_depth++;
891 }
William Juulc051bbe2007-11-15 11:13:05 +0100892
Charles Manning3796e1f2012-05-09 16:55:17 +0000893 if (required_depth > file_struct->top_level) {
894 /* Not tall enough, gotta make the tree taller */
895 for (i = file_struct->top_level; i < required_depth; i++) {
William Juulc051bbe2007-11-15 11:13:05 +0100896
Charles Manning3796e1f2012-05-09 16:55:17 +0000897 tn = yaffs_get_tnode(dev);
William Juulc051bbe2007-11-15 11:13:05 +0100898
Charles Manning3796e1f2012-05-09 16:55:17 +0000899 if (tn) {
900 tn->internal[0] = file_struct->top;
901 file_struct->top = tn;
902 file_struct->top_level++;
903 } else {
904 yaffs_trace(YAFFS_TRACE_ERROR,
905 "yaffs: no more tnodes");
906 return NULL;
907 }
William Juulc051bbe2007-11-15 11:13:05 +0100908 }
Charles Manning3796e1f2012-05-09 16:55:17 +0000909 }
William Juulc051bbe2007-11-15 11:13:05 +0100910
Charles Manning3796e1f2012-05-09 16:55:17 +0000911 /* Traverse down to level 0, adding anything we need */
William Juulc051bbe2007-11-15 11:13:05 +0100912
Charles Manning3796e1f2012-05-09 16:55:17 +0000913 l = file_struct->top_level;
914 tn = file_struct->top;
William Juulc051bbe2007-11-15 11:13:05 +0100915
Charles Manning3796e1f2012-05-09 16:55:17 +0000916 if (l > 0) {
917 while (l > 0 && tn) {
918 x = (chunk_id >>
919 (YAFFS_TNODES_LEVEL0_BITS +
920 (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
921 YAFFS_TNODES_INTERNAL_MASK;
William Juulc051bbe2007-11-15 11:13:05 +0100922
Charles Manning3796e1f2012-05-09 16:55:17 +0000923 if ((l > 1) && !tn->internal[x]) {
924 /* Add missing non-level-zero tnode */
925 tn->internal[x] = yaffs_get_tnode(dev);
926 if (!tn->internal[x])
927 return NULL;
928 } else if (l == 1) {
929 /* Looking from level 1 at level 0 */
930 if (passed_tn) {
931 /* If we already have one, release it */
932 if (tn->internal[x])
933 yaffs_free_tnode(dev,
934 tn->internal[x]);
935 tn->internal[x] = passed_tn;
William Juulc051bbe2007-11-15 11:13:05 +0100936
Charles Manning3796e1f2012-05-09 16:55:17 +0000937 } else if (!tn->internal[x]) {
938 /* Don't have one, none passed in */
939 tn->internal[x] = yaffs_get_tnode(dev);
940 if (!tn->internal[x])
941 return NULL;
942 }
William Juulc051bbe2007-11-15 11:13:05 +0100943 }
944
Charles Manning3796e1f2012-05-09 16:55:17 +0000945 tn = tn->internal[x];
946 l--;
William Juulc051bbe2007-11-15 11:13:05 +0100947 }
Charles Manning3796e1f2012-05-09 16:55:17 +0000948 } else {
949 /* top is level 0 */
950 if (passed_tn) {
951 memcpy(tn, passed_tn,
952 (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8);
953 yaffs_free_tnode(dev, passed_tn);
954 }
William Juulc051bbe2007-11-15 11:13:05 +0100955 }
956
Charles Manning3796e1f2012-05-09 16:55:17 +0000957 return tn;
William Juulc051bbe2007-11-15 11:13:05 +0100958}
959
Charles Manning3796e1f2012-05-09 16:55:17 +0000960static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id,
961 int chunk_obj)
William Juulc051bbe2007-11-15 11:13:05 +0100962{
Charles Manning3796e1f2012-05-09 16:55:17 +0000963 return (tags->chunk_id == chunk_obj &&
964 tags->obj_id == obj_id &&
965 !tags->is_deleted) ? 1 : 0;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +0200966
William Juulc051bbe2007-11-15 11:13:05 +0100967}
968
Charles Manning3796e1f2012-05-09 16:55:17 +0000969static int yaffs_find_chunk_in_group(struct yaffs_dev *dev, int the_chunk,
970 struct yaffs_ext_tags *tags, int obj_id,
971 int inode_chunk)
William Juulc051bbe2007-11-15 11:13:05 +0100972{
Charles Manning3796e1f2012-05-09 16:55:17 +0000973 int j;
William Juulc051bbe2007-11-15 11:13:05 +0100974
Charles Manning3796e1f2012-05-09 16:55:17 +0000975 for (j = 0; the_chunk && j < dev->chunk_grp_size; j++) {
976 if (yaffs_check_chunk_bit
977 (dev, the_chunk / dev->param.chunks_per_block,
978 the_chunk % dev->param.chunks_per_block)) {
William Juulc051bbe2007-11-15 11:13:05 +0100979
Charles Manning3796e1f2012-05-09 16:55:17 +0000980 if (dev->chunk_grp_size == 1)
981 return the_chunk;
982 else {
983 yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL,
984 tags);
985 if (yaffs_tags_match(tags,
986 obj_id, inode_chunk)) {
987 /* found it; */
988 return the_chunk;
William Juulc051bbe2007-11-15 11:13:05 +0100989 }
990 }
Charles Manning3796e1f2012-05-09 16:55:17 +0000991 }
992 the_chunk++;
993 }
994 return -1;
995}
William Juulc051bbe2007-11-15 11:13:05 +0100996
Charles Manning3796e1f2012-05-09 16:55:17 +0000997static int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
998 struct yaffs_ext_tags *tags)
999{
1000 /*Get the Tnode, then get the level 0 offset chunk offset */
1001 struct yaffs_tnode *tn;
1002 int the_chunk = -1;
1003 struct yaffs_ext_tags local_tags;
1004 int ret_val = -1;
1005 struct yaffs_dev *dev = in->my_dev;
William Juulc051bbe2007-11-15 11:13:05 +01001006
Charles Manning3796e1f2012-05-09 16:55:17 +00001007 if (!tags) {
1008 /* Passed a NULL, so use our own tags space */
1009 tags = &local_tags;
1010 }
William Juulc051bbe2007-11-15 11:13:05 +01001011
Charles Manning3796e1f2012-05-09 16:55:17 +00001012 tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
William Juulc051bbe2007-11-15 11:13:05 +01001013
Charles Manning3796e1f2012-05-09 16:55:17 +00001014 if (!tn)
1015 return ret_val;
William Juulc051bbe2007-11-15 11:13:05 +01001016
Charles Manning3796e1f2012-05-09 16:55:17 +00001017 the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
William Juulc051bbe2007-11-15 11:13:05 +01001018
Charles Manning3796e1f2012-05-09 16:55:17 +00001019 ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
1020 inode_chunk);
1021 return ret_val;
William Juulc051bbe2007-11-15 11:13:05 +01001022}
1023
Charles Manning3796e1f2012-05-09 16:55:17 +00001024static int yaffs_find_del_file_chunk(struct yaffs_obj *in, int inode_chunk,
1025 struct yaffs_ext_tags *tags)
William Juulc051bbe2007-11-15 11:13:05 +01001026{
Charles Manning3796e1f2012-05-09 16:55:17 +00001027 /* Get the Tnode, then get the level 0 offset chunk offset */
1028 struct yaffs_tnode *tn;
1029 int the_chunk = -1;
1030 struct yaffs_ext_tags local_tags;
1031 struct yaffs_dev *dev = in->my_dev;
1032 int ret_val = -1;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001033
Charles Manning3796e1f2012-05-09 16:55:17 +00001034 if (!tags) {
1035 /* Passed a NULL, so use our own tags space */
1036 tags = &local_tags;
1037 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001038
Charles Manning3796e1f2012-05-09 16:55:17 +00001039 tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001040
Charles Manning3796e1f2012-05-09 16:55:17 +00001041 if (!tn)
1042 return ret_val;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001043
Charles Manning3796e1f2012-05-09 16:55:17 +00001044 the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
William Juulc051bbe2007-11-15 11:13:05 +01001045
Charles Manning3796e1f2012-05-09 16:55:17 +00001046 ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
1047 inode_chunk);
William Juulc051bbe2007-11-15 11:13:05 +01001048
Charles Manning3796e1f2012-05-09 16:55:17 +00001049 /* Delete the entry in the filestructure (if found) */
1050 if (ret_val != -1)
1051 yaffs_load_tnode_0(dev, tn, inode_chunk, 0);
William Juulc051bbe2007-11-15 11:13:05 +01001052
Charles Manning3796e1f2012-05-09 16:55:17 +00001053 return ret_val;
1054}
William Juulc051bbe2007-11-15 11:13:05 +01001055
Charles Manning3796e1f2012-05-09 16:55:17 +00001056int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
1057 int nand_chunk, int in_scan)
1058{
1059 /* NB in_scan is zero unless scanning.
1060 * For forward scanning, in_scan is > 0;
1061 * for backward scanning in_scan is < 0
1062 *
1063 * nand_chunk = 0 is a dummy insert to make sure the tnodes are there.
1064 */
William Juulc051bbe2007-11-15 11:13:05 +01001065
Charles Manning3796e1f2012-05-09 16:55:17 +00001066 struct yaffs_tnode *tn;
1067 struct yaffs_dev *dev = in->my_dev;
1068 int existing_cunk;
1069 struct yaffs_ext_tags existing_tags;
1070 struct yaffs_ext_tags new_tags;
1071 unsigned existing_serial, new_serial;
William Juulc051bbe2007-11-15 11:13:05 +01001072
Charles Manning3796e1f2012-05-09 16:55:17 +00001073 if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) {
1074 /* Just ignore an attempt at putting a chunk into a non-file
1075 * during scanning.
1076 * If it is not during Scanning then something went wrong!
1077 */
1078 if (!in_scan) {
1079 yaffs_trace(YAFFS_TRACE_ERROR,
1080 "yaffs tragedy:attempt to put data chunk into a non-file"
1081 );
1082 BUG();
William Juulc051bbe2007-11-15 11:13:05 +01001083 }
1084
Charles Manning3796e1f2012-05-09 16:55:17 +00001085 yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
1086 return YAFFS_OK;
William Juulc051bbe2007-11-15 11:13:05 +01001087 }
1088
Charles Manning3796e1f2012-05-09 16:55:17 +00001089 tn = yaffs_add_find_tnode_0(dev,
1090 &in->variant.file_variant,
1091 inode_chunk, NULL);
1092 if (!tn)
1093 return YAFFS_FAIL;
William Juulc051bbe2007-11-15 11:13:05 +01001094
Charles Manning3796e1f2012-05-09 16:55:17 +00001095 if (!nand_chunk)
1096 /* Dummy insert, bail now */
1097 return YAFFS_OK;
William Juulc051bbe2007-11-15 11:13:05 +01001098
Charles Manning3796e1f2012-05-09 16:55:17 +00001099 existing_cunk = yaffs_get_group_base(dev, tn, inode_chunk);
William Juulc051bbe2007-11-15 11:13:05 +01001100
Charles Manning3796e1f2012-05-09 16:55:17 +00001101 if (in_scan != 0) {
1102 /* If we're scanning then we need to test for duplicates
1103 * NB This does not need to be efficient since it should only
1104 * happen when the power fails during a write, then only one
1105 * chunk should ever be affected.
1106 *
1107 * Correction for YAFFS2: This could happen quite a lot and we
1108 * need to think about efficiency! TODO
1109 * Update: For backward scanning we don't need to re-read tags
1110 * so this is quite cheap.
1111 */
William Juulc051bbe2007-11-15 11:13:05 +01001112
Charles Manning3796e1f2012-05-09 16:55:17 +00001113 if (existing_cunk > 0) {
1114 /* NB Right now existing chunk will not be real
1115 * chunk_id if the chunk group size > 1
1116 * thus we have to do a FindChunkInFile to get the
1117 * real chunk id.
1118 *
1119 * We have a duplicate now we need to decide which
1120 * one to use:
1121 *
1122 * Backwards scanning YAFFS2: The old one is what
1123 * we use, dump the new one.
1124 * YAFFS1: Get both sets of tags and compare serial
1125 * numbers.
William Juulc051bbe2007-11-15 11:13:05 +01001126 */
1127
Charles Manning3796e1f2012-05-09 16:55:17 +00001128 if (in_scan > 0) {
1129 /* Only do this for forward scanning */
1130 yaffs_rd_chunk_tags_nand(dev,
1131 nand_chunk,
1132 NULL, &new_tags);
William Juulc051bbe2007-11-15 11:13:05 +01001133
Charles Manning3796e1f2012-05-09 16:55:17 +00001134 /* Do a proper find */
1135 existing_cunk =
1136 yaffs_find_chunk_in_file(in, inode_chunk,
1137 &existing_tags);
William Juulc051bbe2007-11-15 11:13:05 +01001138 }
1139
Charles Manning3796e1f2012-05-09 16:55:17 +00001140 if (existing_cunk <= 0) {
1141 /*Hoosterman - how did this happen? */
William Juulc051bbe2007-11-15 11:13:05 +01001142
Charles Manning3796e1f2012-05-09 16:55:17 +00001143 yaffs_trace(YAFFS_TRACE_ERROR,
1144 "yaffs tragedy: existing chunk < 0 in scan"
1145 );
William Juulc051bbe2007-11-15 11:13:05 +01001146
Charles Manning3796e1f2012-05-09 16:55:17 +00001147 }
William Juulc051bbe2007-11-15 11:13:05 +01001148
Charles Manning3796e1f2012-05-09 16:55:17 +00001149 /* NB The deleted flags should be false, otherwise
1150 * the chunks will not be loaded during a scan
1151 */
William Juulc051bbe2007-11-15 11:13:05 +01001152
Charles Manning3796e1f2012-05-09 16:55:17 +00001153 if (in_scan > 0) {
1154 new_serial = new_tags.serial_number;
1155 existing_serial = existing_tags.serial_number;
William Juulc051bbe2007-11-15 11:13:05 +01001156 }
William Juulc051bbe2007-11-15 11:13:05 +01001157
Charles Manning3796e1f2012-05-09 16:55:17 +00001158 if ((in_scan > 0) &&
1159 (existing_cunk <= 0 ||
1160 ((existing_serial + 1) & 3) == new_serial)) {
1161 /* Forward scanning.
1162 * Use new
1163 * Delete the old one and drop through to
1164 * update the tnode
1165 */
1166 yaffs_chunk_del(dev, existing_cunk, 1,
1167 __LINE__);
1168 } else {
1169 /* Backward scanning or we want to use the
1170 * existing one
1171 * Delete the new one and return early so that
1172 * the tnode isn't changed
1173 */
1174 yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
1175 return YAFFS_OK;
William Juulc051bbe2007-11-15 11:13:05 +01001176 }
William Juulc051bbe2007-11-15 11:13:05 +01001177 }
1178
Charles Manning3796e1f2012-05-09 16:55:17 +00001179 }
William Juulc051bbe2007-11-15 11:13:05 +01001180
Charles Manning3796e1f2012-05-09 16:55:17 +00001181 if (existing_cunk == 0)
1182 in->n_data_chunks++;
William Juulc051bbe2007-11-15 11:13:05 +01001183
Charles Manning3796e1f2012-05-09 16:55:17 +00001184 yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk);
1185
1186 return YAFFS_OK;
William Juulc051bbe2007-11-15 11:13:05 +01001187}
1188
Charles Manning3796e1f2012-05-09 16:55:17 +00001189static void yaffs_soft_del_chunk(struct yaffs_dev *dev, int chunk)
William Juulc051bbe2007-11-15 11:13:05 +01001190{
Charles Manning3796e1f2012-05-09 16:55:17 +00001191 struct yaffs_block_info *the_block;
1192 unsigned block_no;
William Juulc051bbe2007-11-15 11:13:05 +01001193
Charles Manning3796e1f2012-05-09 16:55:17 +00001194 yaffs_trace(YAFFS_TRACE_DELETION, "soft delete chunk %d", chunk);
1195
1196 block_no = chunk / dev->param.chunks_per_block;
1197 the_block = yaffs_get_block_info(dev, block_no);
1198 if (the_block) {
1199 the_block->soft_del_pages++;
1200 dev->n_free_chunks++;
1201 yaffs2_update_oldest_dirty_seq(dev, block_no, the_block);
William Juulc051bbe2007-11-15 11:13:05 +01001202 }
1203}
1204
Charles Manning3796e1f2012-05-09 16:55:17 +00001205/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all
1206 * the chunks in the file.
1207 * All soft deleting does is increment the block's softdelete count and pulls
1208 * the chunk out of the tnode.
1209 * Thus, essentially this is the same as DeleteWorker except that the chunks
1210 * are soft deleted.
William Juulc051bbe2007-11-15 11:13:05 +01001211 */
Charles Manning3796e1f2012-05-09 16:55:17 +00001212
1213static int yaffs_soft_del_worker(struct yaffs_obj *in, struct yaffs_tnode *tn,
1214 u32 level, int chunk_offset)
William Juulc051bbe2007-11-15 11:13:05 +01001215{
1216 int i;
Charles Manning3796e1f2012-05-09 16:55:17 +00001217 int the_chunk;
1218 int all_done = 1;
1219 struct yaffs_dev *dev = in->my_dev;
William Juulc051bbe2007-11-15 11:13:05 +01001220
Charles Manning3796e1f2012-05-09 16:55:17 +00001221 if (!tn)
1222 return 1;
1223
1224 if (level > 0) {
1225 for (i = YAFFS_NTNODES_INTERNAL - 1;
1226 all_done && i >= 0;
1227 i--) {
1228 if (tn->internal[i]) {
1229 all_done =
1230 yaffs_soft_del_worker(in,
1231 tn->internal[i],
1232 level - 1,
1233 (chunk_offset <<
1234 YAFFS_TNODES_INTERNAL_BITS)
1235 + i);
1236 if (all_done) {
1237 yaffs_free_tnode(dev,
1238 tn->internal[i]);
1239 tn->internal[i] = NULL;
1240 } else {
1241 /* Can this happen? */
1242 }
William Juulc051bbe2007-11-15 11:13:05 +01001243 }
1244 }
Charles Manning3796e1f2012-05-09 16:55:17 +00001245 return (all_done) ? 1 : 0;
William Juulc051bbe2007-11-15 11:13:05 +01001246 }
William Juulc051bbe2007-11-15 11:13:05 +01001247
Charles Manning3796e1f2012-05-09 16:55:17 +00001248 /* level 0 */
1249 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1250 the_chunk = yaffs_get_group_base(dev, tn, i);
1251 if (the_chunk) {
1252 yaffs_soft_del_chunk(dev, the_chunk);
1253 yaffs_load_tnode_0(dev, tn, i, 0);
1254 }
1255 }
1256 return 1;
William Juulc051bbe2007-11-15 11:13:05 +01001257}
1258
Charles Manning3796e1f2012-05-09 16:55:17 +00001259static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj)
William Juulc051bbe2007-11-15 11:13:05 +01001260{
Charles Manning3796e1f2012-05-09 16:55:17 +00001261 struct yaffs_dev *dev = obj->my_dev;
1262 struct yaffs_obj *parent;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001263
Charles Manning3796e1f2012-05-09 16:55:17 +00001264 yaffs_verify_obj_in_dir(obj);
1265 parent = obj->parent;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001266
Charles Manning3796e1f2012-05-09 16:55:17 +00001267 yaffs_verify_dir(parent);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001268
Charles Manning3796e1f2012-05-09 16:55:17 +00001269 if (dev && dev->param.remove_obj_fn)
1270 dev->param.remove_obj_fn(obj);
William Juulc051bbe2007-11-15 11:13:05 +01001271
Charles Manning3796e1f2012-05-09 16:55:17 +00001272 list_del_init(&obj->siblings);
1273 obj->parent = NULL;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001274
Charles Manning3796e1f2012-05-09 16:55:17 +00001275 yaffs_verify_dir(parent);
William Juulc051bbe2007-11-15 11:13:05 +01001276}
1277
Charles Manning3796e1f2012-05-09 16:55:17 +00001278void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj)
William Juulc051bbe2007-11-15 11:13:05 +01001279{
Charles Manning3796e1f2012-05-09 16:55:17 +00001280 if (!directory) {
1281 yaffs_trace(YAFFS_TRACE_ALWAYS,
1282 "tragedy: Trying to add an object to a null pointer directory"
1283 );
1284 BUG();
1285 return;
William Juulc051bbe2007-11-15 11:13:05 +01001286 }
Charles Manning3796e1f2012-05-09 16:55:17 +00001287 if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
1288 yaffs_trace(YAFFS_TRACE_ALWAYS,
1289 "tragedy: Trying to add an object to a non-directory"
1290 );
1291 BUG();
William Juulc051bbe2007-11-15 11:13:05 +01001292 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001293
Charles Manning3796e1f2012-05-09 16:55:17 +00001294 if (obj->siblings.prev == NULL) {
1295 /* Not initialised */
1296 BUG();
1297 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001298
Charles Manning3796e1f2012-05-09 16:55:17 +00001299 yaffs_verify_dir(directory);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001300
Charles Manning3796e1f2012-05-09 16:55:17 +00001301 yaffs_remove_obj_from_dir(obj);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001302
Charles Manning3796e1f2012-05-09 16:55:17 +00001303 /* Now add it */
1304 list_add(&obj->siblings, &directory->variant.dir_variant.children);
1305 obj->parent = directory;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001306
Charles Manning3796e1f2012-05-09 16:55:17 +00001307 if (directory == obj->my_dev->unlinked_dir
1308 || directory == obj->my_dev->del_dir) {
1309 obj->unlinked = 1;
1310 obj->my_dev->n_unlinked_files++;
1311 obj->rename_allowed = 0;
1312 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001313
Charles Manning3796e1f2012-05-09 16:55:17 +00001314 yaffs_verify_dir(directory);
1315 yaffs_verify_obj_in_dir(obj);
William Juulc051bbe2007-11-15 11:13:05 +01001316}
1317
Charles Manning3796e1f2012-05-09 16:55:17 +00001318static int yaffs_change_obj_name(struct yaffs_obj *obj,
1319 struct yaffs_obj *new_dir,
1320 const YCHAR *new_name, int force, int shadows)
William Juulc051bbe2007-11-15 11:13:05 +01001321{
Charles Manning3796e1f2012-05-09 16:55:17 +00001322 int unlink_op;
1323 int del_op;
1324 struct yaffs_obj *existing_target;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001325
Charles Manning3796e1f2012-05-09 16:55:17 +00001326 if (new_dir == NULL)
1327 new_dir = obj->parent; /* use the old directory */
William Juulc051bbe2007-11-15 11:13:05 +01001328
Charles Manning3796e1f2012-05-09 16:55:17 +00001329 if (new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
1330 yaffs_trace(YAFFS_TRACE_ALWAYS,
1331 "tragedy: yaffs_change_obj_name: new_dir is not a directory"
1332 );
1333 BUG();
1334 }
William Juulc051bbe2007-11-15 11:13:05 +01001335
Charles Manning3796e1f2012-05-09 16:55:17 +00001336 unlink_op = (new_dir == obj->my_dev->unlinked_dir);
1337 del_op = (new_dir == obj->my_dev->del_dir);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001338
Charles Manning3796e1f2012-05-09 16:55:17 +00001339 existing_target = yaffs_find_by_name(new_dir, new_name);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001340
Charles Manning3796e1f2012-05-09 16:55:17 +00001341 /* If the object is a file going into the unlinked directory,
1342 * then it is OK to just stuff it in since duplicate names are OK.
1343 * else only proceed if the new name does not exist and we're putting
1344 * it into a directory.
1345 */
1346 if (!(unlink_op || del_op || force ||
1347 shadows > 0 || !existing_target) ||
1348 new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
1349 return YAFFS_FAIL;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001350
Charles Manning3796e1f2012-05-09 16:55:17 +00001351 yaffs_set_obj_name(obj, new_name);
1352 obj->dirty = 1;
1353 yaffs_add_obj_to_dir(new_dir, obj);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001354
Charles Manning3796e1f2012-05-09 16:55:17 +00001355 if (unlink_op)
1356 obj->unlinked = 1;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001357
Charles Manning3796e1f2012-05-09 16:55:17 +00001358 /* If it is a deletion then we mark it as a shrink for gc */
1359 if (yaffs_update_oh(obj, new_name, 0, del_op, shadows, NULL) >= 0)
1360 return YAFFS_OK;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001361
Charles Manning3796e1f2012-05-09 16:55:17 +00001362 return YAFFS_FAIL;
William Juulc051bbe2007-11-15 11:13:05 +01001363}
1364
Charles Manning3796e1f2012-05-09 16:55:17 +00001365/*------------------------ Short Operations Cache ------------------------------
1366 * In many situations where there is no high level buffering a lot of
1367 * reads might be short sequential reads, and a lot of writes may be short
1368 * sequential writes. eg. scanning/writing a jpeg file.
1369 * In these cases, a short read/write cache can provide a huge perfomance
1370 * benefit with dumb-as-a-rock code.
1371 * In Linux, the page cache provides read buffering and the short op cache
1372 * provides write buffering.
1373 *
1374 * There are a small number (~10) of cache chunks per device so that we don't
1375 * need a very intelligent search.
1376 */
1377
1378static int yaffs_obj_cache_dirty(struct yaffs_obj *obj)
1379{
1380 struct yaffs_dev *dev = obj->my_dev;
1381 int i;
1382 struct yaffs_cache *cache;
1383 int n_caches = obj->my_dev->param.n_caches;
1384
1385 for (i = 0; i < n_caches; i++) {
1386 cache = &dev->cache[i];
1387 if (cache->object == obj && cache->dirty)
1388 return 1;
1389 }
William Juulc051bbe2007-11-15 11:13:05 +01001390
Charles Manning3796e1f2012-05-09 16:55:17 +00001391 return 0;
1392}
William Juulc051bbe2007-11-15 11:13:05 +01001393
Charles Manning3796e1f2012-05-09 16:55:17 +00001394static void yaffs_flush_file_cache(struct yaffs_obj *obj)
William Juulc051bbe2007-11-15 11:13:05 +01001395{
Charles Manning3796e1f2012-05-09 16:55:17 +00001396 struct yaffs_dev *dev = obj->my_dev;
1397 int lowest = -99; /* Stop compiler whining. */
William Juulc051bbe2007-11-15 11:13:05 +01001398 int i;
Charles Manning3796e1f2012-05-09 16:55:17 +00001399 struct yaffs_cache *cache;
1400 int chunk_written = 0;
1401 int n_caches = obj->my_dev->param.n_caches;
William Juulc051bbe2007-11-15 11:13:05 +01001402
Charles Manning3796e1f2012-05-09 16:55:17 +00001403 if (n_caches < 1)
1404 return;
1405 do {
1406 cache = NULL;
William Juulc051bbe2007-11-15 11:13:05 +01001407
Charles Manning3796e1f2012-05-09 16:55:17 +00001408 /* Find the lowest dirty chunk for this object */
1409 for (i = 0; i < n_caches; i++) {
1410 if (dev->cache[i].object == obj &&
1411 dev->cache[i].dirty) {
1412 if (!cache ||
1413 dev->cache[i].chunk_id < lowest) {
1414 cache = &dev->cache[i];
1415 lowest = cache->chunk_id;
William Juulc051bbe2007-11-15 11:13:05 +01001416 }
1417 }
William Juulc051bbe2007-11-15 11:13:05 +01001418 }
William Juulc051bbe2007-11-15 11:13:05 +01001419
Charles Manning3796e1f2012-05-09 16:55:17 +00001420 if (cache && !cache->locked) {
1421 /* Write it out and free it up */
1422 chunk_written =
1423 yaffs_wr_data_obj(cache->object,
1424 cache->chunk_id,
1425 cache->data,
1426 cache->n_bytes, 1);
1427 cache->dirty = 0;
1428 cache->object = NULL;
1429 }
1430 } while (cache && chunk_written > 0);
William Juulc051bbe2007-11-15 11:13:05 +01001431
Charles Manning3796e1f2012-05-09 16:55:17 +00001432 if (cache)
1433 /* Hoosterman, disk full while writing cache out. */
1434 yaffs_trace(YAFFS_TRACE_ERROR,
1435 "yaffs tragedy: no space during cache write");
William Juulc051bbe2007-11-15 11:13:05 +01001436}
1437
Charles Manning3796e1f2012-05-09 16:55:17 +00001438/*yaffs_flush_whole_cache(dev)
1439 *
1440 *
1441 */
1442
1443void yaffs_flush_whole_cache(struct yaffs_dev *dev)
William Juulc051bbe2007-11-15 11:13:05 +01001444{
Charles Manning3796e1f2012-05-09 16:55:17 +00001445 struct yaffs_obj *obj;
1446 int n_caches = dev->param.n_caches;
1447 int i;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001448
Charles Manning3796e1f2012-05-09 16:55:17 +00001449 /* Find a dirty object in the cache and flush it...
1450 * until there are no further dirty objects.
1451 */
1452 do {
1453 obj = NULL;
1454 for (i = 0; i < n_caches && !obj; i++) {
1455 if (dev->cache[i].object && dev->cache[i].dirty)
1456 obj = dev->cache[i].object;
1457 }
1458 if (obj)
1459 yaffs_flush_file_cache(obj);
1460 } while (obj);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001461
William Juulc051bbe2007-11-15 11:13:05 +01001462}
1463
Charles Manning3796e1f2012-05-09 16:55:17 +00001464/* Grab us a cache chunk for use.
1465 * First look for an empty one.
1466 * Then look for the least recently used non-dirty one.
1467 * Then look for the least recently used dirty one...., flush and look again.
1468 */
1469static struct yaffs_cache *yaffs_grab_chunk_worker(struct yaffs_dev *dev)
William Juulc051bbe2007-11-15 11:13:05 +01001470{
Charles Manning3796e1f2012-05-09 16:55:17 +00001471 int i;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001472
Charles Manning3796e1f2012-05-09 16:55:17 +00001473 if (dev->param.n_caches > 0) {
1474 for (i = 0; i < dev->param.n_caches; i++) {
1475 if (!dev->cache[i].object)
1476 return &dev->cache[i];
William Juulc051bbe2007-11-15 11:13:05 +01001477 }
William Juulc051bbe2007-11-15 11:13:05 +01001478 }
Charles Manning3796e1f2012-05-09 16:55:17 +00001479 return NULL;
William Juulc051bbe2007-11-15 11:13:05 +01001480}
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001481
Charles Manning3796e1f2012-05-09 16:55:17 +00001482static struct yaffs_cache *yaffs_grab_chunk_cache(struct yaffs_dev *dev)
William Juulc051bbe2007-11-15 11:13:05 +01001483{
Charles Manning3796e1f2012-05-09 16:55:17 +00001484 struct yaffs_cache *cache;
1485 struct yaffs_obj *the_obj;
1486 int usage;
William Juulc051bbe2007-11-15 11:13:05 +01001487 int i;
Charles Manning3796e1f2012-05-09 16:55:17 +00001488 int pushout;
William Juulc051bbe2007-11-15 11:13:05 +01001489
Charles Manning3796e1f2012-05-09 16:55:17 +00001490 if (dev->param.n_caches < 1)
1491 return NULL;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001492
Charles Manning3796e1f2012-05-09 16:55:17 +00001493 /* Try find a non-dirty one... */
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001494
Charles Manning3796e1f2012-05-09 16:55:17 +00001495 cache = yaffs_grab_chunk_worker(dev);
William Juulc051bbe2007-11-15 11:13:05 +01001496
Charles Manning3796e1f2012-05-09 16:55:17 +00001497 if (!cache) {
1498 /* They were all dirty, find the LRU object and flush
1499 * its cache, then find again.
1500 * NB what's here is not very accurate,
1501 * we actually flush the object with the LRU chunk.
1502 */
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001503
Charles Manning3796e1f2012-05-09 16:55:17 +00001504 /* With locking we can't assume we can use entry zero,
1505 * Set the_obj to a valid pointer for Coverity. */
1506 the_obj = dev->cache[0].object;
1507 usage = -1;
1508 cache = NULL;
1509 pushout = -1;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001510
Charles Manning3796e1f2012-05-09 16:55:17 +00001511 for (i = 0; i < dev->param.n_caches; i++) {
1512 if (dev->cache[i].object &&
1513 !dev->cache[i].locked &&
1514 (dev->cache[i].last_use < usage ||
1515 !cache)) {
1516 usage = dev->cache[i].last_use;
1517 the_obj = dev->cache[i].object;
1518 cache = &dev->cache[i];
1519 pushout = i;
William Juulc051bbe2007-11-15 11:13:05 +01001520 }
1521 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001522
Charles Manning3796e1f2012-05-09 16:55:17 +00001523 if (!cache || cache->dirty) {
1524 /* Flush and try again */
1525 yaffs_flush_file_cache(the_obj);
1526 cache = yaffs_grab_chunk_worker(dev);
1527 }
1528 }
1529 return cache;
William Juulc051bbe2007-11-15 11:13:05 +01001530}
1531
Charles Manning3796e1f2012-05-09 16:55:17 +00001532/* Find a cached chunk */
1533static struct yaffs_cache *yaffs_find_chunk_cache(const struct yaffs_obj *obj,
1534 int chunk_id)
William Juulc051bbe2007-11-15 11:13:05 +01001535{
Charles Manning3796e1f2012-05-09 16:55:17 +00001536 struct yaffs_dev *dev = obj->my_dev;
1537 int i;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001538
Charles Manning3796e1f2012-05-09 16:55:17 +00001539 if (dev->param.n_caches < 1)
1540 return NULL;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001541
Charles Manning3796e1f2012-05-09 16:55:17 +00001542 for (i = 0; i < dev->param.n_caches; i++) {
1543 if (dev->cache[i].object == obj &&
1544 dev->cache[i].chunk_id == chunk_id) {
1545 dev->cache_hits++;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001546
Charles Manning3796e1f2012-05-09 16:55:17 +00001547 return &dev->cache[i];
William Juulc051bbe2007-11-15 11:13:05 +01001548 }
1549 }
Charles Manning3796e1f2012-05-09 16:55:17 +00001550 return NULL;
William Juulc051bbe2007-11-15 11:13:05 +01001551}
1552
Charles Manning3796e1f2012-05-09 16:55:17 +00001553/* Mark the chunk for the least recently used algorithym */
1554static void yaffs_use_cache(struct yaffs_dev *dev, struct yaffs_cache *cache,
1555 int is_write)
William Juulc051bbe2007-11-15 11:13:05 +01001556{
Charles Manning3796e1f2012-05-09 16:55:17 +00001557 int i;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001558
Charles Manning3796e1f2012-05-09 16:55:17 +00001559 if (dev->param.n_caches < 1)
1560 return;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001561
Charles Manning3796e1f2012-05-09 16:55:17 +00001562 if (dev->cache_last_use < 0 ||
1563 dev->cache_last_use > 100000000) {
1564 /* Reset the cache usages */
1565 for (i = 1; i < dev->param.n_caches; i++)
1566 dev->cache[i].last_use = 0;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001567
Charles Manning3796e1f2012-05-09 16:55:17 +00001568 dev->cache_last_use = 0;
1569 }
1570 dev->cache_last_use++;
1571 cache->last_use = dev->cache_last_use;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001572
Charles Manning3796e1f2012-05-09 16:55:17 +00001573 if (is_write)
1574 cache->dirty = 1;
William Juulc051bbe2007-11-15 11:13:05 +01001575}
1576
Charles Manning3796e1f2012-05-09 16:55:17 +00001577/* Invalidate a single cache page.
1578 * Do this when a whole page gets written,
1579 * ie the short cache for this page is no longer valid.
1580 */
1581static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object, int chunk_id)
William Juulc051bbe2007-11-15 11:13:05 +01001582{
Charles Manning3796e1f2012-05-09 16:55:17 +00001583 struct yaffs_cache *cache;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001584
Charles Manning3796e1f2012-05-09 16:55:17 +00001585 if (object->my_dev->param.n_caches > 0) {
1586 cache = yaffs_find_chunk_cache(object, chunk_id);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001587
Charles Manning3796e1f2012-05-09 16:55:17 +00001588 if (cache)
1589 cache->object = NULL;
1590 }
1591}
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001592
Charles Manning3796e1f2012-05-09 16:55:17 +00001593/* Invalidate all the cache pages associated with this object
1594 * Do this whenever ther file is deleted or resized.
1595 */
1596static void yaffs_invalidate_whole_cache(struct yaffs_obj *in)
1597{
1598 int i;
1599 struct yaffs_dev *dev = in->my_dev;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001600
Charles Manning3796e1f2012-05-09 16:55:17 +00001601 if (dev->param.n_caches > 0) {
1602 /* Invalidate it. */
1603 for (i = 0; i < dev->param.n_caches; i++) {
1604 if (dev->cache[i].object == in)
1605 dev->cache[i].object = NULL;
1606 }
1607 }
William Juulc051bbe2007-11-15 11:13:05 +01001608}
1609
Charles Manning3796e1f2012-05-09 16:55:17 +00001610static void yaffs_unhash_obj(struct yaffs_obj *obj)
William Juulc051bbe2007-11-15 11:13:05 +01001611{
Charles Manning3796e1f2012-05-09 16:55:17 +00001612 int bucket;
1613 struct yaffs_dev *dev = obj->my_dev;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001614
Charles Manning3796e1f2012-05-09 16:55:17 +00001615 /* If it is still linked into the bucket list, free from the list */
1616 if (!list_empty(&obj->hash_link)) {
1617 list_del_init(&obj->hash_link);
1618 bucket = yaffs_hash_fn(obj->obj_id);
1619 dev->obj_bucket[bucket].count--;
William Juulc051bbe2007-11-15 11:13:05 +01001620 }
Charles Manning3796e1f2012-05-09 16:55:17 +00001621}
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001622
Charles Manning3796e1f2012-05-09 16:55:17 +00001623/* FreeObject frees up a Object and puts it back on the free list */
1624static void yaffs_free_obj(struct yaffs_obj *obj)
1625{
1626 struct yaffs_dev *dev;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001627
Charles Manning3796e1f2012-05-09 16:55:17 +00001628 if (!obj) {
1629 BUG();
1630 return;
William Juulc051bbe2007-11-15 11:13:05 +01001631 }
Charles Manning3796e1f2012-05-09 16:55:17 +00001632 dev = obj->my_dev;
1633 yaffs_trace(YAFFS_TRACE_OS, "FreeObject %p inode %p",
1634 obj, obj->my_inode);
1635 if (obj->parent)
1636 BUG();
1637 if (!list_empty(&obj->siblings))
1638 BUG();
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001639
Charles Manning3796e1f2012-05-09 16:55:17 +00001640 if (obj->my_inode) {
1641 /* We're still hooked up to a cached inode.
1642 * Don't delete now, but mark for later deletion
1643 */
1644 obj->defered_free = 1;
1645 return;
William Juulc051bbe2007-11-15 11:13:05 +01001646 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001647
Charles Manning3796e1f2012-05-09 16:55:17 +00001648 yaffs_unhash_obj(obj);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001649
Charles Manning3796e1f2012-05-09 16:55:17 +00001650 yaffs_free_raw_obj(dev, obj);
1651 dev->n_obj--;
1652 dev->checkpoint_blocks_required = 0; /* force recalculation */
William Juulc051bbe2007-11-15 11:13:05 +01001653}
1654
Charles Manning3796e1f2012-05-09 16:55:17 +00001655void yaffs_handle_defered_free(struct yaffs_obj *obj)
William Juulc051bbe2007-11-15 11:13:05 +01001656{
Charles Manning3796e1f2012-05-09 16:55:17 +00001657 if (obj->defered_free)
1658 yaffs_free_obj(obj);
1659}
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001660
Charles Manning3796e1f2012-05-09 16:55:17 +00001661static int yaffs_generic_obj_del(struct yaffs_obj *in)
1662{
1663 /* Iinvalidate the file's data in the cache, without flushing. */
1664 yaffs_invalidate_whole_cache(in);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001665
Charles Manning3796e1f2012-05-09 16:55:17 +00001666 if (in->my_dev->param.is_yaffs2 && in->parent != in->my_dev->del_dir) {
1667 /* Move to unlinked directory so we have a deletion record */
1668 yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0,
1669 0);
William Juulc051bbe2007-11-15 11:13:05 +01001670 }
1671
Charles Manning3796e1f2012-05-09 16:55:17 +00001672 yaffs_remove_obj_from_dir(in);
1673 yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__);
1674 in->hdr_chunk = 0;
William Juulc051bbe2007-11-15 11:13:05 +01001675
Charles Manning3796e1f2012-05-09 16:55:17 +00001676 yaffs_free_obj(in);
1677 return YAFFS_OK;
William Juulc051bbe2007-11-15 11:13:05 +01001678
1679}
1680
Charles Manning3796e1f2012-05-09 16:55:17 +00001681static void yaffs_soft_del_file(struct yaffs_obj *obj)
William Juulc051bbe2007-11-15 11:13:05 +01001682{
Charles Manning3796e1f2012-05-09 16:55:17 +00001683 if (!obj->deleted ||
1684 obj->variant_type != YAFFS_OBJECT_TYPE_FILE ||
1685 obj->soft_del)
1686 return;
1687
1688 if (obj->n_data_chunks <= 0) {
1689 /* Empty file with no duplicate object headers,
1690 * just delete it immediately */
1691 yaffs_free_tnode(obj->my_dev, obj->variant.file_variant.top);
1692 obj->variant.file_variant.top = NULL;
1693 yaffs_trace(YAFFS_TRACE_TRACING,
1694 "yaffs: Deleting empty file %d",
1695 obj->obj_id);
1696 yaffs_generic_obj_del(obj);
1697 } else {
1698 yaffs_soft_del_worker(obj,
1699 obj->variant.file_variant.top,
1700 obj->variant.
1701 file_variant.top_level, 0);
1702 obj->soft_del = 1;
William Juulc051bbe2007-11-15 11:13:05 +01001703 }
1704}
1705
Charles Manning3796e1f2012-05-09 16:55:17 +00001706/* Pruning removes any part of the file structure tree that is beyond the
1707 * bounds of the file (ie that does not point to chunks).
1708 *
1709 * A file should only get pruned when its size is reduced.
1710 *
1711 * Before pruning, the chunks must be pulled from the tree and the
1712 * level 0 tnode entries must be zeroed out.
1713 * Could also use this for file deletion, but that's probably better handled
1714 * by a special case.
1715 *
1716 * This function is recursive. For levels > 0 the function is called again on
1717 * any sub-tree. For level == 0 we just check if the sub-tree has data.
1718 * If there is no data in a subtree then it is pruned.
1719 */
William Juulc051bbe2007-11-15 11:13:05 +01001720
Charles Manning3796e1f2012-05-09 16:55:17 +00001721static struct yaffs_tnode *yaffs_prune_worker(struct yaffs_dev *dev,
1722 struct yaffs_tnode *tn, u32 level,
1723 int del0)
William Juulc051bbe2007-11-15 11:13:05 +01001724{
Charles Manning3796e1f2012-05-09 16:55:17 +00001725 int i;
1726 int has_data;
William Juulc051bbe2007-11-15 11:13:05 +01001727
Charles Manning3796e1f2012-05-09 16:55:17 +00001728 if (!tn)
1729 return tn;
William Juulc051bbe2007-11-15 11:13:05 +01001730
Charles Manning3796e1f2012-05-09 16:55:17 +00001731 has_data = 0;
William Juulc051bbe2007-11-15 11:13:05 +01001732
Charles Manning3796e1f2012-05-09 16:55:17 +00001733 if (level > 0) {
1734 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1735 if (tn->internal[i]) {
1736 tn->internal[i] =
1737 yaffs_prune_worker(dev,
1738 tn->internal[i],
1739 level - 1,
1740 (i == 0) ? del0 : 1);
1741 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001742
Charles Manning3796e1f2012-05-09 16:55:17 +00001743 if (tn->internal[i])
1744 has_data++;
1745 }
1746 } else {
1747 int tnode_size_u32 = dev->tnode_size / sizeof(u32);
1748 u32 *map = (u32 *) tn;
1749
1750 for (i = 0; !has_data && i < tnode_size_u32; i++) {
1751 if (map[i])
1752 has_data++;
1753 }
1754 }
William Juulc051bbe2007-11-15 11:13:05 +01001755
Charles Manning3796e1f2012-05-09 16:55:17 +00001756 if (has_data == 0 && del0) {
1757 /* Free and return NULL */
1758 yaffs_free_tnode(dev, tn);
1759 tn = NULL;
1760 }
1761 return tn;
William Juulc051bbe2007-11-15 11:13:05 +01001762}
1763
Charles Manning3796e1f2012-05-09 16:55:17 +00001764static int yaffs_prune_tree(struct yaffs_dev *dev,
1765 struct yaffs_file_var *file_struct)
William Juulc051bbe2007-11-15 11:13:05 +01001766{
Charles Manning3796e1f2012-05-09 16:55:17 +00001767 int i;
1768 int has_data;
1769 int done = 0;
1770 struct yaffs_tnode *tn;
1771
1772 if (file_struct->top_level < 1)
1773 return YAFFS_OK;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001774
Charles Manning3796e1f2012-05-09 16:55:17 +00001775 file_struct->top =
1776 yaffs_prune_worker(dev, file_struct->top, file_struct->top_level, 0);
William Juulc051bbe2007-11-15 11:13:05 +01001777
Charles Manning3796e1f2012-05-09 16:55:17 +00001778 /* Now we have a tree with all the non-zero branches NULL but
1779 * the height is the same as it was.
1780 * Let's see if we can trim internal tnodes to shorten the tree.
1781 * We can do this if only the 0th element in the tnode is in use
1782 * (ie all the non-zero are NULL)
1783 */
William Juulc051bbe2007-11-15 11:13:05 +01001784
Charles Manning3796e1f2012-05-09 16:55:17 +00001785 while (file_struct->top_level && !done) {
1786 tn = file_struct->top;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02001787
Charles Manning3796e1f2012-05-09 16:55:17 +00001788 has_data = 0;
1789 for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1790 if (tn->internal[i])
1791 has_data++;
1792 }
1793
1794 if (!has_data) {
1795 file_struct->top = tn->internal[0];
1796 file_struct->top_level--;
1797 yaffs_free_tnode(dev, tn);
1798 } else {
1799 done = 1;
1800 }
1801 }
1802
1803 return YAFFS_OK;
William Juulc051bbe2007-11-15 11:13:05 +01001804}
1805
Charles Manning3796e1f2012-05-09 16:55:17 +00001806/*-------------------- End of File Structure functions.-------------------*/
William Juulc051bbe2007-11-15 11:13:05 +01001807
Charles Manning3796e1f2012-05-09 16:55:17 +00001808/* alloc_empty_obj gets us a clean Object.*/
1809static struct yaffs_obj *yaffs_alloc_empty_obj(struct yaffs_dev *dev)
William Juulc051bbe2007-11-15 11:13:05 +01001810{
Charles Manning3796e1f2012-05-09 16:55:17 +00001811 struct yaffs_obj *obj = yaffs_alloc_raw_obj(dev);
William Juulc051bbe2007-11-15 11:13:05 +01001812
Charles Manning3796e1f2012-05-09 16:55:17 +00001813 if (!obj)
1814 return obj;
William Juulc051bbe2007-11-15 11:13:05 +01001815
Charles Manning3796e1f2012-05-09 16:55:17 +00001816 dev->n_obj++;
William Juulc051bbe2007-11-15 11:13:05 +01001817
Charles Manning3796e1f2012-05-09 16:55:17 +00001818 /* Now sweeten it up... */
William Juulc051bbe2007-11-15 11:13:05 +01001819
Charles Manning3796e1f2012-05-09 16:55:17 +00001820 memset(obj, 0, sizeof(struct yaffs_obj));
1821 obj->being_created = 1;
William Juulc051bbe2007-11-15 11:13:05 +01001822
Charles Manning3796e1f2012-05-09 16:55:17 +00001823 obj->my_dev = dev;
1824 obj->hdr_chunk = 0;
1825 obj->variant_type = YAFFS_OBJECT_TYPE_UNKNOWN;
1826 INIT_LIST_HEAD(&(obj->hard_links));
1827 INIT_LIST_HEAD(&(obj->hash_link));
1828 INIT_LIST_HEAD(&obj->siblings);
William Juulc051bbe2007-11-15 11:13:05 +01001829
Charles Manning3796e1f2012-05-09 16:55:17 +00001830 /* Now make the directory sane */
1831 if (dev->root_dir) {
1832 obj->parent = dev->root_dir;
1833 list_add(&(obj->siblings),
1834 &dev->root_dir->variant.dir_variant.children);
1835 }
William Juulc051bbe2007-11-15 11:13:05 +01001836
Charles Manning3796e1f2012-05-09 16:55:17 +00001837 /* Add it to the lost and found directory.
1838 * NB Can't put root or lost-n-found in lost-n-found so
1839 * check if lost-n-found exists first
1840 */
1841 if (dev->lost_n_found)
1842 yaffs_add_obj_to_dir(dev->lost_n_found, obj);
William Juulc051bbe2007-11-15 11:13:05 +01001843
Charles Manning3796e1f2012-05-09 16:55:17 +00001844 obj->being_created = 0;
William Juulc051bbe2007-11-15 11:13:05 +01001845
Charles Manning3796e1f2012-05-09 16:55:17 +00001846 dev->checkpoint_blocks_required = 0; /* force recalculation */
William Juulc051bbe2007-11-15 11:13:05 +01001847
Charles Manning3796e1f2012-05-09 16:55:17 +00001848 return obj;
1849}
William Juulc051bbe2007-11-15 11:13:05 +01001850
Charles Manning3796e1f2012-05-09 16:55:17 +00001851static int yaffs_find_nice_bucket(struct yaffs_dev *dev)
1852{
1853 int i;
1854 int l = 999;
1855 int lowest = 999999;
William Juulc051bbe2007-11-15 11:13:05 +01001856
Charles Manning3796e1f2012-05-09 16:55:17 +00001857 /* Search for the shortest list or one that
1858 * isn't too long.
1859 */
William Juulc051bbe2007-11-15 11:13:05 +01001860
Charles Manning3796e1f2012-05-09 16:55:17 +00001861 for (i = 0; i < 10 && lowest > 4; i++) {
1862 dev->bucket_finder++;
1863 dev->bucket_finder %= YAFFS_NOBJECT_BUCKETS;
1864 if (dev->obj_bucket[dev->bucket_finder].count < lowest) {
1865 lowest = dev->obj_bucket[dev->bucket_finder].count;
1866 l = dev->bucket_finder;
1867 }
1868 }
William Juulc051bbe2007-11-15 11:13:05 +01001869
Charles Manning3796e1f2012-05-09 16:55:17 +00001870 return l;
1871}
William Juulc051bbe2007-11-15 11:13:05 +01001872
Charles Manning3796e1f2012-05-09 16:55:17 +00001873static int yaffs_new_obj_id(struct yaffs_dev *dev)
1874{
1875 int bucket = yaffs_find_nice_bucket(dev);
1876 int found = 0;
1877 struct list_head *i;
1878 u32 n = (u32) bucket;
1879
1880 /* Now find an object value that has not already been taken
1881 * by scanning the list.
1882 */
1883
1884 while (!found) {
1885 found = 1;
1886 n += YAFFS_NOBJECT_BUCKETS;
1887 if (1 || dev->obj_bucket[bucket].count > 0) {
1888 list_for_each(i, &dev->obj_bucket[bucket].list) {
1889 /* If there is already one in the list */
1890 if (i && list_entry(i, struct yaffs_obj,
1891 hash_link)->obj_id == n) {
1892 found = 0;
1893 }
William Juulc051bbe2007-11-15 11:13:05 +01001894 }
Charles Manning3796e1f2012-05-09 16:55:17 +00001895 }
1896 }
1897 return n;
1898}
William Juulc051bbe2007-11-15 11:13:05 +01001899
Charles Manning3796e1f2012-05-09 16:55:17 +00001900static void yaffs_hash_obj(struct yaffs_obj *in)
1901{
1902 int bucket = yaffs_hash_fn(in->obj_id);
1903 struct yaffs_dev *dev = in->my_dev;
William Juulc051bbe2007-11-15 11:13:05 +01001904
Charles Manning3796e1f2012-05-09 16:55:17 +00001905 list_add(&in->hash_link, &dev->obj_bucket[bucket].list);
1906 dev->obj_bucket[bucket].count++;
1907}
William Juulc051bbe2007-11-15 11:13:05 +01001908
Charles Manning3796e1f2012-05-09 16:55:17 +00001909struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number)
1910{
1911 int bucket = yaffs_hash_fn(number);
1912 struct list_head *i;
1913 struct yaffs_obj *in;
1914
1915 list_for_each(i, &dev->obj_bucket[bucket].list) {
1916 /* Look if it is in the list */
1917 in = list_entry(i, struct yaffs_obj, hash_link);
1918 if (in->obj_id == number) {
1919 /* Don't show if it is defered free */
1920 if (in->defered_free)
1921 return NULL;
1922 return in;
1923 }
1924 }
1925
1926 return NULL;
1927}
William Juulc051bbe2007-11-15 11:13:05 +01001928
Charles Manning3796e1f2012-05-09 16:55:17 +00001929struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number,
1930 enum yaffs_obj_type type)
1931{
1932 struct yaffs_obj *the_obj = NULL;
1933 struct yaffs_tnode *tn = NULL;
William Juulc051bbe2007-11-15 11:13:05 +01001934
Charles Manning3796e1f2012-05-09 16:55:17 +00001935 if (number < 0)
1936 number = yaffs_new_obj_id(dev);
William Juulc051bbe2007-11-15 11:13:05 +01001937
Charles Manning3796e1f2012-05-09 16:55:17 +00001938 if (type == YAFFS_OBJECT_TYPE_FILE) {
1939 tn = yaffs_get_tnode(dev);
1940 if (!tn)
1941 return NULL;
1942 }
William Juulc051bbe2007-11-15 11:13:05 +01001943
Charles Manning3796e1f2012-05-09 16:55:17 +00001944 the_obj = yaffs_alloc_empty_obj(dev);
1945 if (!the_obj) {
1946 if (tn)
1947 yaffs_free_tnode(dev, tn);
1948 return NULL;
William Juulc051bbe2007-11-15 11:13:05 +01001949 }
1950
Charles Manning3796e1f2012-05-09 16:55:17 +00001951 the_obj->fake = 0;
1952 the_obj->rename_allowed = 1;
1953 the_obj->unlink_allowed = 1;
1954 the_obj->obj_id = number;
1955 yaffs_hash_obj(the_obj);
1956 the_obj->variant_type = type;
1957 yaffs_load_current_time(the_obj, 1, 1);
1958
1959 switch (type) {
1960 case YAFFS_OBJECT_TYPE_FILE:
1961 the_obj->variant.file_variant.file_size = 0;
1962 the_obj->variant.file_variant.scanned_size = 0;
1963 the_obj->variant.file_variant.shrink_size =
1964 yaffs_max_file_size(dev);
1965 the_obj->variant.file_variant.top_level = 0;
1966 the_obj->variant.file_variant.top = tn;
1967 break;
1968 case YAFFS_OBJECT_TYPE_DIRECTORY:
1969 INIT_LIST_HEAD(&the_obj->variant.dir_variant.children);
1970 INIT_LIST_HEAD(&the_obj->variant.dir_variant.dirty);
1971 break;
1972 case YAFFS_OBJECT_TYPE_SYMLINK:
1973 case YAFFS_OBJECT_TYPE_HARDLINK:
1974 case YAFFS_OBJECT_TYPE_SPECIAL:
1975 /* No action required */
1976 break;
1977 case YAFFS_OBJECT_TYPE_UNKNOWN:
1978 /* todo this should not happen */
1979 break;
1980 }
1981 return the_obj;
William Juulc051bbe2007-11-15 11:13:05 +01001982}
1983
Charles Manning3796e1f2012-05-09 16:55:17 +00001984static struct yaffs_obj *yaffs_create_fake_dir(struct yaffs_dev *dev,
1985 int number, u32 mode)
William Juulc051bbe2007-11-15 11:13:05 +01001986{
1987
Charles Manning3796e1f2012-05-09 16:55:17 +00001988 struct yaffs_obj *obj =
1989 yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
William Juulc051bbe2007-11-15 11:13:05 +01001990
Charles Manning3796e1f2012-05-09 16:55:17 +00001991 if (!obj)
1992 return NULL;
William Juulc051bbe2007-11-15 11:13:05 +01001993
Charles Manning3796e1f2012-05-09 16:55:17 +00001994 obj->fake = 1; /* it is fake so it might not use NAND */
1995 obj->rename_allowed = 0;
1996 obj->unlink_allowed = 0;
1997 obj->deleted = 0;
1998 obj->unlinked = 0;
1999 obj->yst_mode = mode;
2000 obj->my_dev = dev;
2001 obj->hdr_chunk = 0; /* Not a valid chunk. */
2002 return obj;
William Juulc051bbe2007-11-15 11:13:05 +01002003
Charles Manning3796e1f2012-05-09 16:55:17 +00002004}
William Juulc051bbe2007-11-15 11:13:05 +01002005
William Juulc051bbe2007-11-15 11:13:05 +01002006
Charles Manning3796e1f2012-05-09 16:55:17 +00002007static void yaffs_init_tnodes_and_objs(struct yaffs_dev *dev)
2008{
2009 int i;
William Juulc051bbe2007-11-15 11:13:05 +01002010
Charles Manning3796e1f2012-05-09 16:55:17 +00002011 dev->n_obj = 0;
2012 dev->n_tnodes = 0;
2013 yaffs_init_raw_tnodes_and_objs(dev);
William Juulc051bbe2007-11-15 11:13:05 +01002014
Charles Manning3796e1f2012-05-09 16:55:17 +00002015 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
2016 INIT_LIST_HEAD(&dev->obj_bucket[i].list);
2017 dev->obj_bucket[i].count = 0;
2018 }
2019}
William Juulc051bbe2007-11-15 11:13:05 +01002020
Charles Manning3796e1f2012-05-09 16:55:17 +00002021struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
2022 int number,
2023 enum yaffs_obj_type type)
2024{
2025 struct yaffs_obj *the_obj = NULL;
William Juulc051bbe2007-11-15 11:13:05 +01002026
Charles Manning3796e1f2012-05-09 16:55:17 +00002027 if (number > 0)
2028 the_obj = yaffs_find_by_number(dev, number);
William Juulc051bbe2007-11-15 11:13:05 +01002029
Charles Manning3796e1f2012-05-09 16:55:17 +00002030 if (!the_obj)
2031 the_obj = yaffs_new_obj(dev, number, type);
William Juulc051bbe2007-11-15 11:13:05 +01002032
Charles Manning3796e1f2012-05-09 16:55:17 +00002033 return the_obj;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02002034
Charles Manning3796e1f2012-05-09 16:55:17 +00002035}
William Juulc051bbe2007-11-15 11:13:05 +01002036
Charles Manning3796e1f2012-05-09 16:55:17 +00002037YCHAR *yaffs_clone_str(const YCHAR *str)
2038{
2039 YCHAR *new_str = NULL;
2040 int len;
William Juulc051bbe2007-11-15 11:13:05 +01002041
Charles Manning3796e1f2012-05-09 16:55:17 +00002042 if (!str)
2043 str = _Y("");
William Juulc051bbe2007-11-15 11:13:05 +01002044
Charles Manning3796e1f2012-05-09 16:55:17 +00002045 len = yaffs_strnlen(str, YAFFS_MAX_ALIAS_LENGTH);
2046 new_str = kmalloc((len + 1) * sizeof(YCHAR), GFP_NOFS);
2047 if (new_str) {
2048 yaffs_strncpy(new_str, str, len);
2049 new_str[len] = 0;
2050 }
2051 return new_str;
William Juulc051bbe2007-11-15 11:13:05 +01002052
Charles Manning3796e1f2012-05-09 16:55:17 +00002053}
2054/*
2055 *yaffs_update_parent() handles fixing a directories mtime and ctime when a new
2056 * link (ie. name) is created or deleted in the directory.
2057 *
2058 * ie.
2059 * create dir/a : update dir's mtime/ctime
2060 * rm dir/a: update dir's mtime/ctime
2061 * modify dir/a: don't update dir's mtimme/ctime
2062 *
2063 * This can be handled immediately or defered. Defering helps reduce the number
2064 * of updates when many files in a directory are changed within a brief period.
2065 *
2066 * If the directory updating is defered then yaffs_update_dirty_dirs must be
2067 * called periodically.
2068 */
William Juulc051bbe2007-11-15 11:13:05 +01002069
Charles Manning3796e1f2012-05-09 16:55:17 +00002070static void yaffs_update_parent(struct yaffs_obj *obj)
2071{
2072 struct yaffs_dev *dev;
William Juulc051bbe2007-11-15 11:13:05 +01002073
Charles Manning3796e1f2012-05-09 16:55:17 +00002074 if (!obj)
2075 return;
2076 dev = obj->my_dev;
2077 obj->dirty = 1;
2078 yaffs_load_current_time(obj, 0, 1);
2079 if (dev->param.defered_dir_update) {
2080 struct list_head *link = &obj->variant.dir_variant.dirty;
William Juulc051bbe2007-11-15 11:13:05 +01002081
Charles Manning3796e1f2012-05-09 16:55:17 +00002082 if (list_empty(link)) {
2083 list_add(link, &dev->dirty_dirs);
2084 yaffs_trace(YAFFS_TRACE_BACKGROUND,
2085 "Added object %d to dirty directories",
2086 obj->obj_id);
2087 }
William Juulc051bbe2007-11-15 11:13:05 +01002088
Charles Manning3796e1f2012-05-09 16:55:17 +00002089 } else {
2090 yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
2091 }
2092}
William Juulc051bbe2007-11-15 11:13:05 +01002093
Charles Manning3796e1f2012-05-09 16:55:17 +00002094void yaffs_update_dirty_dirs(struct yaffs_dev *dev)
2095{
2096 struct list_head *link;
2097 struct yaffs_obj *obj;
2098 struct yaffs_dir_var *d_s;
2099 union yaffs_obj_var *o_v;
William Juulc051bbe2007-11-15 11:13:05 +01002100
Charles Manning3796e1f2012-05-09 16:55:17 +00002101 yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update dirty directories");
William Juulc051bbe2007-11-15 11:13:05 +01002102
Charles Manning3796e1f2012-05-09 16:55:17 +00002103 while (!list_empty(&dev->dirty_dirs)) {
2104 link = dev->dirty_dirs.next;
2105 list_del_init(link);
William Juulc051bbe2007-11-15 11:13:05 +01002106
Charles Manning3796e1f2012-05-09 16:55:17 +00002107 d_s = list_entry(link, struct yaffs_dir_var, dirty);
2108 o_v = list_entry(d_s, union yaffs_obj_var, dir_variant);
2109 obj = list_entry(o_v, struct yaffs_obj, variant);
William Juulc051bbe2007-11-15 11:13:05 +01002110
Charles Manning3796e1f2012-05-09 16:55:17 +00002111 yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update directory %d",
2112 obj->obj_id);
William Juulc051bbe2007-11-15 11:13:05 +01002113
Charles Manning3796e1f2012-05-09 16:55:17 +00002114 if (obj->dirty)
2115 yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
2116 }
2117}
William Juulc051bbe2007-11-15 11:13:05 +01002118
Charles Manning3796e1f2012-05-09 16:55:17 +00002119/*
2120 * Mknod (create) a new object.
2121 * equiv_obj only has meaning for a hard link;
2122 * alias_str only has meaning for a symlink.
2123 * rdev only has meaning for devices (a subset of special objects)
2124 */
William Juulc051bbe2007-11-15 11:13:05 +01002125
Charles Manning3796e1f2012-05-09 16:55:17 +00002126static struct yaffs_obj *yaffs_create_obj(enum yaffs_obj_type type,
2127 struct yaffs_obj *parent,
2128 const YCHAR *name,
2129 u32 mode,
2130 u32 uid,
2131 u32 gid,
2132 struct yaffs_obj *equiv_obj,
2133 const YCHAR *alias_str, u32 rdev)
2134{
2135 struct yaffs_obj *in;
2136 YCHAR *str = NULL;
2137 struct yaffs_dev *dev = parent->my_dev;
William Juulc051bbe2007-11-15 11:13:05 +01002138
Charles Manning3796e1f2012-05-09 16:55:17 +00002139 /* Check if the entry exists.
2140 * If it does then fail the call since we don't want a dup. */
2141 if (yaffs_find_by_name(parent, name))
2142 return NULL;
William Juulc051bbe2007-11-15 11:13:05 +01002143
Charles Manning3796e1f2012-05-09 16:55:17 +00002144 if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
2145 str = yaffs_clone_str(alias_str);
2146 if (!str)
2147 return NULL;
William Juulc051bbe2007-11-15 11:13:05 +01002148 }
2149
Charles Manning3796e1f2012-05-09 16:55:17 +00002150 in = yaffs_new_obj(dev, -1, type);
William Juulc051bbe2007-11-15 11:13:05 +01002151
Charles Manning3796e1f2012-05-09 16:55:17 +00002152 if (!in) {
2153 kfree(str);
2154 return NULL;
2155 }
William Juulc051bbe2007-11-15 11:13:05 +01002156
Charles Manning3796e1f2012-05-09 16:55:17 +00002157 in->hdr_chunk = 0;
2158 in->valid = 1;
2159 in->variant_type = type;
William Juulc051bbe2007-11-15 11:13:05 +01002160
Charles Manning3796e1f2012-05-09 16:55:17 +00002161 in->yst_mode = mode;
William Juulc051bbe2007-11-15 11:13:05 +01002162
Charles Manning3796e1f2012-05-09 16:55:17 +00002163 yaffs_attribs_init(in, gid, uid, rdev);
William Juulc051bbe2007-11-15 11:13:05 +01002164
Charles Manning3796e1f2012-05-09 16:55:17 +00002165 in->n_data_chunks = 0;
William Juulc051bbe2007-11-15 11:13:05 +01002166
Charles Manning3796e1f2012-05-09 16:55:17 +00002167 yaffs_set_obj_name(in, name);
2168 in->dirty = 1;
William Juulc051bbe2007-11-15 11:13:05 +01002169
Charles Manning3796e1f2012-05-09 16:55:17 +00002170 yaffs_add_obj_to_dir(parent, in);
William Juulc051bbe2007-11-15 11:13:05 +01002171
Charles Manning3796e1f2012-05-09 16:55:17 +00002172 in->my_dev = parent->my_dev;
William Juulc051bbe2007-11-15 11:13:05 +01002173
Charles Manning3796e1f2012-05-09 16:55:17 +00002174 switch (type) {
2175 case YAFFS_OBJECT_TYPE_SYMLINK:
2176 in->variant.symlink_variant.alias = str;
2177 break;
2178 case YAFFS_OBJECT_TYPE_HARDLINK:
2179 in->variant.hardlink_variant.equiv_obj = equiv_obj;
2180 in->variant.hardlink_variant.equiv_id = equiv_obj->obj_id;
2181 list_add(&in->hard_links, &equiv_obj->hard_links);
2182 break;
2183 case YAFFS_OBJECT_TYPE_FILE:
2184 case YAFFS_OBJECT_TYPE_DIRECTORY:
2185 case YAFFS_OBJECT_TYPE_SPECIAL:
2186 case YAFFS_OBJECT_TYPE_UNKNOWN:
2187 /* do nothing */
2188 break;
2189 }
2190
2191 if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) {
2192 /* Could not create the object header, fail */
2193 yaffs_del_obj(in);
2194 in = NULL;
William Juulc051bbe2007-11-15 11:13:05 +01002195 }
2196
Charles Manning3796e1f2012-05-09 16:55:17 +00002197 if (in)
2198 yaffs_update_parent(parent);
2199
2200 return in;
William Juulc051bbe2007-11-15 11:13:05 +01002201}
2202
Charles Manning3796e1f2012-05-09 16:55:17 +00002203struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
2204 const YCHAR *name, u32 mode, u32 uid,
2205 u32 gid)
William Juulc051bbe2007-11-15 11:13:05 +01002206{
Charles Manning3796e1f2012-05-09 16:55:17 +00002207 return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
2208 uid, gid, NULL, NULL, 0);
2209}
William Juulc051bbe2007-11-15 11:13:05 +01002210
Charles Manning3796e1f2012-05-09 16:55:17 +00002211struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR *name,
2212 u32 mode, u32 uid, u32 gid)
2213{
2214 return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
2215 mode, uid, gid, NULL, NULL, 0);
2216}
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02002217
Charles Manning3796e1f2012-05-09 16:55:17 +00002218struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
2219 const YCHAR *name, u32 mode, u32 uid,
2220 u32 gid, u32 rdev)
2221{
2222 return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
2223 uid, gid, NULL, NULL, rdev);
2224}
William Juulc051bbe2007-11-15 11:13:05 +01002225
Charles Manning3796e1f2012-05-09 16:55:17 +00002226struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
2227 const YCHAR *name, u32 mode, u32 uid,
2228 u32 gid, const YCHAR *alias)
2229{
2230 return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
2231 uid, gid, NULL, alias, 0);
2232}
William Juulc051bbe2007-11-15 11:13:05 +01002233
Charles Manning3796e1f2012-05-09 16:55:17 +00002234/* yaffs_link_obj returns the object id of the equivalent object.*/
2235struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name,
2236 struct yaffs_obj *equiv_obj)
2237{
2238 /* Get the real object in case we were fed a hard link obj */
2239 equiv_obj = yaffs_get_equivalent_obj(equiv_obj);
William Juulc051bbe2007-11-15 11:13:05 +01002240
Charles Manning3796e1f2012-05-09 16:55:17 +00002241 if (yaffs_create_obj(YAFFS_OBJECT_TYPE_HARDLINK,
2242 parent, name, 0, 0, 0,
2243 equiv_obj, NULL, 0))
2244 return equiv_obj;
William Juulc051bbe2007-11-15 11:13:05 +01002245
Charles Manning3796e1f2012-05-09 16:55:17 +00002246 return NULL;
William Juulc051bbe2007-11-15 11:13:05 +01002247
Charles Manning3796e1f2012-05-09 16:55:17 +00002248}
William Juulc051bbe2007-11-15 11:13:05 +01002249
William Juulc051bbe2007-11-15 11:13:05 +01002250
William Juulc051bbe2007-11-15 11:13:05 +01002251
Charles Manning3796e1f2012-05-09 16:55:17 +00002252/*---------------------- Block Management and Page Allocation -------------*/
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02002253
Charles Manning3796e1f2012-05-09 16:55:17 +00002254static void yaffs_deinit_blocks(struct yaffs_dev *dev)
2255{
2256 if (dev->block_info_alt && dev->block_info)
2257 vfree(dev->block_info);
2258 else
2259 kfree(dev->block_info);
William Juulc051bbe2007-11-15 11:13:05 +01002260
Charles Manning3796e1f2012-05-09 16:55:17 +00002261 dev->block_info_alt = 0;
William Juulc051bbe2007-11-15 11:13:05 +01002262
Charles Manning3796e1f2012-05-09 16:55:17 +00002263 dev->block_info = NULL;
William Juulc051bbe2007-11-15 11:13:05 +01002264
Charles Manning3796e1f2012-05-09 16:55:17 +00002265 if (dev->chunk_bits_alt && dev->chunk_bits)
2266 vfree(dev->chunk_bits);
2267 else
2268 kfree(dev->chunk_bits);
2269 dev->chunk_bits_alt = 0;
2270 dev->chunk_bits = NULL;
2271}
William Juulc051bbe2007-11-15 11:13:05 +01002272
Charles Manning3796e1f2012-05-09 16:55:17 +00002273static int yaffs_init_blocks(struct yaffs_dev *dev)
2274{
2275 int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
William Juulc051bbe2007-11-15 11:13:05 +01002276
Charles Manning3796e1f2012-05-09 16:55:17 +00002277 dev->block_info = NULL;
2278 dev->chunk_bits = NULL;
2279 dev->alloc_block = -1; /* force it to get a new one */
William Juulc051bbe2007-11-15 11:13:05 +01002280
Charles Manning3796e1f2012-05-09 16:55:17 +00002281 /* If the first allocation strategy fails, thry the alternate one */
2282 dev->block_info =
2283 kmalloc(n_blocks * sizeof(struct yaffs_block_info), GFP_NOFS);
2284 if (!dev->block_info) {
2285 dev->block_info =
2286 vmalloc(n_blocks * sizeof(struct yaffs_block_info));
2287 dev->block_info_alt = 1;
William Juulc051bbe2007-11-15 11:13:05 +01002288 } else {
Charles Manning3796e1f2012-05-09 16:55:17 +00002289 dev->block_info_alt = 0;
William Juulc051bbe2007-11-15 11:13:05 +01002290 }
2291
Charles Manning3796e1f2012-05-09 16:55:17 +00002292 if (!dev->block_info)
2293 goto alloc_error;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02002294
Charles Manning3796e1f2012-05-09 16:55:17 +00002295 /* Set up dynamic blockinfo stuff. Round up bytes. */
2296 dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8;
2297 dev->chunk_bits =
2298 kmalloc(dev->chunk_bit_stride * n_blocks, GFP_NOFS);
2299 if (!dev->chunk_bits) {
2300 dev->chunk_bits =
2301 vmalloc(dev->chunk_bit_stride * n_blocks);
2302 dev->chunk_bits_alt = 1;
2303 } else {
2304 dev->chunk_bits_alt = 0;
William Juulc051bbe2007-11-15 11:13:05 +01002305 }
Charles Manning3796e1f2012-05-09 16:55:17 +00002306 if (!dev->chunk_bits)
2307 goto alloc_error;
2308
William Juulc051bbe2007-11-15 11:13:05 +01002309
Charles Manning3796e1f2012-05-09 16:55:17 +00002310 memset(dev->block_info, 0, n_blocks * sizeof(struct yaffs_block_info));
2311 memset(dev->chunk_bits, 0, dev->chunk_bit_stride * n_blocks);
William Juulc051bbe2007-11-15 11:13:05 +01002312 return YAFFS_OK;
Charles Manning3796e1f2012-05-09 16:55:17 +00002313
2314alloc_error:
2315 yaffs_deinit_blocks(dev);
2316 return YAFFS_FAIL;
William Juulc051bbe2007-11-15 11:13:05 +01002317}
2318
Charles Manning3796e1f2012-05-09 16:55:17 +00002319
2320void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no)
William Juulc051bbe2007-11-15 11:13:05 +01002321{
Charles Manning3796e1f2012-05-09 16:55:17 +00002322 struct yaffs_block_info *bi = yaffs_get_block_info(dev, block_no);
2323 int erased_ok = 0;
2324 int i;
William Juulc051bbe2007-11-15 11:13:05 +01002325
Charles Manning3796e1f2012-05-09 16:55:17 +00002326 /* If the block is still healthy erase it and mark as clean.
2327 * If the block has had a data failure, then retire it.
2328 */
William Juulc051bbe2007-11-15 11:13:05 +01002329
Charles Manning3796e1f2012-05-09 16:55:17 +00002330 yaffs_trace(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
2331 "yaffs_block_became_dirty block %d state %d %s",
2332 block_no, bi->block_state,
2333 (bi->needs_retiring) ? "needs retiring" : "");
William Juulc051bbe2007-11-15 11:13:05 +01002334
Charles Manning3796e1f2012-05-09 16:55:17 +00002335 yaffs2_clear_oldest_dirty_seq(dev, bi);
William Juulc051bbe2007-11-15 11:13:05 +01002336
Charles Manning3796e1f2012-05-09 16:55:17 +00002337 bi->block_state = YAFFS_BLOCK_STATE_DIRTY;
William Juulc051bbe2007-11-15 11:13:05 +01002338
Charles Manning3796e1f2012-05-09 16:55:17 +00002339 /* If this is the block being garbage collected then stop gc'ing */
2340 if (block_no == dev->gc_block)
2341 dev->gc_block = 0;
William Juulc051bbe2007-11-15 11:13:05 +01002342
Charles Manning3796e1f2012-05-09 16:55:17 +00002343 /* If this block is currently the best candidate for gc
2344 * then drop as a candidate */
2345 if (block_no == dev->gc_dirtiest) {
2346 dev->gc_dirtiest = 0;
2347 dev->gc_pages_in_use = 0;
2348 }
2349
2350 if (!bi->needs_retiring) {
2351 yaffs2_checkpt_invalidate(dev);
2352 erased_ok = yaffs_erase_block(dev, block_no);
2353 if (!erased_ok) {
2354 dev->n_erase_failures++;
2355 yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2356 "**>> Erasure failed %d", block_no);
William Juulc051bbe2007-11-15 11:13:05 +01002357 }
Charles Manning3796e1f2012-05-09 16:55:17 +00002358 }
William Juulc051bbe2007-11-15 11:13:05 +01002359
Charles Manning3796e1f2012-05-09 16:55:17 +00002360 /* Verify erasure if needed */
2361 if (erased_ok &&
2362 ((yaffs_trace_mask & YAFFS_TRACE_ERASE) ||
2363 !yaffs_skip_verification(dev))) {
2364 for (i = 0; i < dev->param.chunks_per_block; i++) {
2365 if (!yaffs_check_chunk_erased(dev,
2366 block_no * dev->param.chunks_per_block + i)) {
2367 yaffs_trace(YAFFS_TRACE_ERROR,
2368 ">>Block %d erasure supposedly OK, but chunk %d not erased",
2369 block_no, i);
2370 }
2371 }
William Juulc051bbe2007-11-15 11:13:05 +01002372 }
2373
Charles Manning3796e1f2012-05-09 16:55:17 +00002374 if (!erased_ok) {
2375 /* We lost a block of free space */
2376 dev->n_free_chunks -= dev->param.chunks_per_block;
2377 yaffs_retire_block(dev, block_no);
2378 yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2379 "**>> Block %d retired", block_no);
2380 return;
2381 }
2382
2383 /* Clean it up... */
2384 bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
2385 bi->seq_number = 0;
2386 dev->n_erased_blocks++;
2387 bi->pages_in_use = 0;
2388 bi->soft_del_pages = 0;
2389 bi->has_shrink_hdr = 0;
2390 bi->skip_erased_check = 1; /* Clean, so no need to check */
2391 bi->gc_prioritise = 0;
2392 bi->has_summary = 0;
2393
2394 yaffs_clear_chunk_bits(dev, block_no);
William Juulc051bbe2007-11-15 11:13:05 +01002395
Charles Manning3796e1f2012-05-09 16:55:17 +00002396 yaffs_trace(YAFFS_TRACE_ERASE, "Erased block %d", block_no);
William Juulc051bbe2007-11-15 11:13:05 +01002397}
2398
Charles Manning3796e1f2012-05-09 16:55:17 +00002399static inline int yaffs_gc_process_chunk(struct yaffs_dev *dev,
2400 struct yaffs_block_info *bi,
2401 int old_chunk, u8 *buffer)
William Juulc051bbe2007-11-15 11:13:05 +01002402{
Charles Manning3796e1f2012-05-09 16:55:17 +00002403 int new_chunk;
2404 int mark_flash = 1;
2405 struct yaffs_ext_tags tags;
2406 struct yaffs_obj *object;
2407 int matching_chunk;
2408 int ret_val = YAFFS_OK;
William Juulc051bbe2007-11-15 11:13:05 +01002409
Charles Manning3796e1f2012-05-09 16:55:17 +00002410 memset(&tags, 0, sizeof(tags));
2411 yaffs_rd_chunk_tags_nand(dev, old_chunk,
2412 buffer, &tags);
2413 object = yaffs_find_by_number(dev, tags.obj_id);
William Juulc051bbe2007-11-15 11:13:05 +01002414
Charles Manning3796e1f2012-05-09 16:55:17 +00002415 yaffs_trace(YAFFS_TRACE_GC_DETAIL,
2416 "Collecting chunk in block %d, %d %d %d ",
2417 dev->gc_chunk, tags.obj_id,
2418 tags.chunk_id, tags.n_bytes);
William Juulc051bbe2007-11-15 11:13:05 +01002419
Charles Manning3796e1f2012-05-09 16:55:17 +00002420 if (object && !yaffs_skip_verification(dev)) {
2421 if (tags.chunk_id == 0)
2422 matching_chunk =
2423 object->hdr_chunk;
2424 else if (object->soft_del)
2425 /* Defeat the test */
2426 matching_chunk = old_chunk;
2427 else
2428 matching_chunk =
2429 yaffs_find_chunk_in_file
2430 (object, tags.chunk_id,
2431 NULL);
William Juulc051bbe2007-11-15 11:13:05 +01002432
Charles Manning3796e1f2012-05-09 16:55:17 +00002433 if (old_chunk != matching_chunk)
2434 yaffs_trace(YAFFS_TRACE_ERROR,
2435 "gc: page in gc mismatch: %d %d %d %d",
2436 old_chunk,
2437 matching_chunk,
2438 tags.obj_id,
2439 tags.chunk_id);
2440 }
William Juulc051bbe2007-11-15 11:13:05 +01002441
Charles Manning3796e1f2012-05-09 16:55:17 +00002442 if (!object) {
2443 yaffs_trace(YAFFS_TRACE_ERROR,
2444 "page %d in gc has no object: %d %d %d ",
2445 old_chunk,
2446 tags.obj_id, tags.chunk_id,
2447 tags.n_bytes);
2448 }
William Juulc051bbe2007-11-15 11:13:05 +01002449
Charles Manning3796e1f2012-05-09 16:55:17 +00002450 if (object &&
2451 object->deleted &&
2452 object->soft_del && tags.chunk_id != 0) {
2453 /* Data chunk in a soft deleted file,
2454 * throw it away.
2455 * It's a soft deleted data chunk,
2456 * No need to copy this, just forget
2457 * about it and fix up the object.
2458 */
William Juulc051bbe2007-11-15 11:13:05 +01002459
Charles Manning3796e1f2012-05-09 16:55:17 +00002460 /* Free chunks already includes
2461 * softdeleted chunks, how ever this
2462 * chunk is going to soon be really
2463 * deleted which will increment free
2464 * chunks. We have to decrement free
2465 * chunks so this works out properly.
2466 */
2467 dev->n_free_chunks--;
2468 bi->soft_del_pages--;
William Juulc051bbe2007-11-15 11:13:05 +01002469
Charles Manning3796e1f2012-05-09 16:55:17 +00002470 object->n_data_chunks--;
2471 if (object->n_data_chunks <= 0) {
2472 /* remeber to clean up obj */
2473 dev->gc_cleanup_list[dev->n_clean_ups] = tags.obj_id;
2474 dev->n_clean_ups++;
2475 }
2476 mark_flash = 0;
2477 } else if (object) {
2478 /* It's either a data chunk in a live
2479 * file or an ObjectHeader, so we're
2480 * interested in it.
2481 * NB Need to keep the ObjectHeaders of
2482 * deleted files until the whole file
2483 * has been deleted off
2484 */
2485 tags.serial_number++;
2486 dev->n_gc_copies++;
William Juulc051bbe2007-11-15 11:13:05 +01002487
Charles Manning3796e1f2012-05-09 16:55:17 +00002488 if (tags.chunk_id == 0) {
2489 /* It is an object Id,
2490 * We need to nuke the
2491 * shrinkheader flags since its
2492 * work is done.
2493 * Also need to clean up
2494 * shadowing.
2495 */
2496 struct yaffs_obj_hdr *oh;
2497 oh = (struct yaffs_obj_hdr *) buffer;
William Juulc051bbe2007-11-15 11:13:05 +01002498
Charles Manning3796e1f2012-05-09 16:55:17 +00002499 oh->is_shrink = 0;
2500 tags.extra_is_shrink = 0;
2501 oh->shadows_obj = 0;
2502 oh->inband_shadowed_obj_id = 0;
2503 tags.extra_shadows = 0;
William Juulc051bbe2007-11-15 11:13:05 +01002504
Charles Manning3796e1f2012-05-09 16:55:17 +00002505 /* Update file size */
2506 if (object->variant_type == YAFFS_OBJECT_TYPE_FILE) {
2507 yaffs_oh_size_load(oh,
2508 object->variant.file_variant.file_size);
2509 tags.extra_file_size =
2510 object->variant.file_variant.file_size;
William Juulc051bbe2007-11-15 11:13:05 +01002511 }
Charles Manning3796e1f2012-05-09 16:55:17 +00002512
2513 yaffs_verify_oh(object, oh, &tags, 1);
2514 new_chunk =
2515 yaffs_write_new_chunk(dev, (u8 *) oh, &tags, 1);
William Juulc051bbe2007-11-15 11:13:05 +01002516 } else {
Charles Manning3796e1f2012-05-09 16:55:17 +00002517 new_chunk =
2518 yaffs_write_new_chunk(dev, buffer, &tags, 1);
William Juulc051bbe2007-11-15 11:13:05 +01002519 }
2520
Charles Manning3796e1f2012-05-09 16:55:17 +00002521 if (new_chunk < 0) {
2522 ret_val = YAFFS_FAIL;
2523 } else {
William Juulc051bbe2007-11-15 11:13:05 +01002524
Charles Manning3796e1f2012-05-09 16:55:17 +00002525 /* Now fix up the Tnodes etc. */
William Juulc051bbe2007-11-15 11:13:05 +01002526
Charles Manning3796e1f2012-05-09 16:55:17 +00002527 if (tags.chunk_id == 0) {
2528 /* It's a header */
2529 object->hdr_chunk = new_chunk;
2530 object->serial = tags.serial_number;
2531 } else {
2532 /* It's a data chunk */
2533 yaffs_put_chunk_in_file(object, tags.chunk_id,
2534 new_chunk, 0);
2535 }
William Juulc051bbe2007-11-15 11:13:05 +01002536 }
William Juulc051bbe2007-11-15 11:13:05 +01002537 }
Charles Manning3796e1f2012-05-09 16:55:17 +00002538 if (ret_val == YAFFS_OK)
2539 yaffs_chunk_del(dev, old_chunk, mark_flash, __LINE__);
2540 return ret_val;
William Juulc051bbe2007-11-15 11:13:05 +01002541}
2542
Charles Manning3796e1f2012-05-09 16:55:17 +00002543static int yaffs_gc_block(struct yaffs_dev *dev, int block, int whole_block)
William Juulc051bbe2007-11-15 11:13:05 +01002544{
Charles Manning3796e1f2012-05-09 16:55:17 +00002545 int old_chunk;
2546 int ret_val = YAFFS_OK;
2547 int i;
2548 int is_checkpt_block;
2549 int max_copies;
2550 int chunks_before = yaffs_get_erased_chunks(dev);
2551 int chunks_after;
2552 struct yaffs_block_info *bi = yaffs_get_block_info(dev, block);
William Juulc051bbe2007-11-15 11:13:05 +01002553
Charles Manning3796e1f2012-05-09 16:55:17 +00002554 is_checkpt_block = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT);
William Juulc051bbe2007-11-15 11:13:05 +01002555
Charles Manning3796e1f2012-05-09 16:55:17 +00002556 yaffs_trace(YAFFS_TRACE_TRACING,
2557 "Collecting block %d, in use %d, shrink %d, whole_block %d",
2558 block, bi->pages_in_use, bi->has_shrink_hdr,
2559 whole_block);
William Juulc051bbe2007-11-15 11:13:05 +01002560
Charles Manning3796e1f2012-05-09 16:55:17 +00002561 /*yaffs_verify_free_chunks(dev); */
William Juulc051bbe2007-11-15 11:13:05 +01002562
Charles Manning3796e1f2012-05-09 16:55:17 +00002563 if (bi->block_state == YAFFS_BLOCK_STATE_FULL)
2564 bi->block_state = YAFFS_BLOCK_STATE_COLLECTING;
William Juulc051bbe2007-11-15 11:13:05 +01002565
Charles Manning3796e1f2012-05-09 16:55:17 +00002566 bi->has_shrink_hdr = 0; /* clear the flag so that the block can erase */
William Juulc051bbe2007-11-15 11:13:05 +01002567
Charles Manning3796e1f2012-05-09 16:55:17 +00002568 dev->gc_disable = 1;
2569
2570 yaffs_summary_gc(dev, block);
2571
2572 if (is_checkpt_block || !yaffs_still_some_chunks(dev, block)) {
2573 yaffs_trace(YAFFS_TRACE_TRACING,
2574 "Collecting block %d that has no chunks in use",
2575 block);
2576 yaffs_block_became_dirty(dev, block);
2577 } else {
2578
2579 u8 *buffer = yaffs_get_temp_buffer(dev);
2580
2581 yaffs_verify_blk(dev, bi, block);
2582
2583 max_copies = (whole_block) ? dev->param.chunks_per_block : 5;
2584 old_chunk = block * dev->param.chunks_per_block + dev->gc_chunk;
2585
2586 for (/* init already done */ ;
2587 ret_val == YAFFS_OK &&
2588 dev->gc_chunk < dev->param.chunks_per_block &&
2589 (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) &&
2590 max_copies > 0;
2591 dev->gc_chunk++, old_chunk++) {
2592 if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) {
2593 /* Page is in use and might need to be copied */
2594 max_copies--;
2595 ret_val = yaffs_gc_process_chunk(dev, bi,
2596 old_chunk, buffer);
2597 }
2598 }
2599 yaffs_release_temp_buffer(dev, buffer);
2600 }
2601
2602 yaffs_verify_collected_blk(dev, bi, block);
2603
2604 if (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
2605 /*
2606 * The gc did not complete. Set block state back to FULL
2607 * because checkpointing does not restore gc.
2608 */
2609 bi->block_state = YAFFS_BLOCK_STATE_FULL;
2610 } else {
2611 /* The gc completed. */
2612 /* Do any required cleanups */
2613 for (i = 0; i < dev->n_clean_ups; i++) {
2614 /* Time to delete the file too */
2615 struct yaffs_obj *object =
2616 yaffs_find_by_number(dev, dev->gc_cleanup_list[i]);
2617 if (object) {
2618 yaffs_free_tnode(dev,
2619 object->variant.file_variant.top);
2620 object->variant.file_variant.top = NULL;
2621 yaffs_trace(YAFFS_TRACE_GC,
2622 "yaffs: About to finally delete object %d",
2623 object->obj_id);
2624 yaffs_generic_obj_del(object);
2625 object->my_dev->n_deleted_files--;
2626 }
2627
2628 }
2629 chunks_after = yaffs_get_erased_chunks(dev);
2630 if (chunks_before >= chunks_after)
2631 yaffs_trace(YAFFS_TRACE_GC,
2632 "gc did not increase free chunks before %d after %d",
2633 chunks_before, chunks_after);
2634 dev->gc_block = 0;
2635 dev->gc_chunk = 0;
2636 dev->n_clean_ups = 0;
William Juulc051bbe2007-11-15 11:13:05 +01002637 }
Charles Manning3796e1f2012-05-09 16:55:17 +00002638
2639 dev->gc_disable = 0;
2640
2641 return ret_val;
William Juulc051bbe2007-11-15 11:13:05 +01002642}
2643
Charles Manning3796e1f2012-05-09 16:55:17 +00002644/*
2645 * find_gc_block() selects the dirtiest block (or close enough)
2646 * for garbage collection.
2647 */
2648
2649static unsigned yaffs_find_gc_block(struct yaffs_dev *dev,
2650 int aggressive, int background)
William Juulc051bbe2007-11-15 11:13:05 +01002651{
Charles Manning3796e1f2012-05-09 16:55:17 +00002652 int i;
2653 int iterations;
2654 unsigned selected = 0;
2655 int prioritised = 0;
2656 int prioritised_exist = 0;
2657 struct yaffs_block_info *bi;
2658 int threshold;
William Juulc051bbe2007-11-15 11:13:05 +01002659
Charles Manning3796e1f2012-05-09 16:55:17 +00002660 /* First let's see if we need to grab a prioritised block */
2661 if (dev->has_pending_prioritised_gc && !aggressive) {
2662 dev->gc_dirtiest = 0;
2663 bi = dev->block_info;
2664 for (i = dev->internal_start_block;
2665 i <= dev->internal_end_block && !selected; i++) {
2666
2667 if (bi->gc_prioritise) {
2668 prioritised_exist = 1;
2669 if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
2670 yaffs_block_ok_for_gc(dev, bi)) {
2671 selected = i;
2672 prioritised = 1;
2673 }
2674 }
2675 bi++;
2676 }
2677
2678 /*
2679 * If there is a prioritised block and none was selected then
2680 * this happened because there is at least one old dirty block
2681 * gumming up the works. Let's gc the oldest dirty block.
William Juulc051bbe2007-11-15 11:13:05 +01002682 */
2683
Charles Manning3796e1f2012-05-09 16:55:17 +00002684 if (prioritised_exist &&
2685 !selected && dev->oldest_dirty_block > 0)
2686 selected = dev->oldest_dirty_block;
2687
2688 if (!prioritised_exist) /* None found, so we can clear this */
2689 dev->has_pending_prioritised_gc = 0;
2690 }
2691
2692 /* If we're doing aggressive GC then we are happy to take a less-dirty
2693 * block, and search harder.
2694 * else (leasurely gc), then we only bother to do this if the
2695 * block has only a few pages in use.
2696 */
William Juulc051bbe2007-11-15 11:13:05 +01002697
Charles Manning3796e1f2012-05-09 16:55:17 +00002698 if (!selected) {
2699 int pages_used;
2700 int n_blocks =
2701 dev->internal_end_block - dev->internal_start_block + 1;
2702 if (aggressive) {
2703 threshold = dev->param.chunks_per_block;
2704 iterations = n_blocks;
2705 } else {
2706 int max_threshold;
William Juulc051bbe2007-11-15 11:13:05 +01002707
Charles Manning3796e1f2012-05-09 16:55:17 +00002708 if (background)
2709 max_threshold = dev->param.chunks_per_block / 2;
2710 else
2711 max_threshold = dev->param.chunks_per_block / 8;
William Juulc051bbe2007-11-15 11:13:05 +01002712
Charles Manning3796e1f2012-05-09 16:55:17 +00002713 if (max_threshold < YAFFS_GC_PASSIVE_THRESHOLD)
2714 max_threshold = YAFFS_GC_PASSIVE_THRESHOLD;
William Juulc051bbe2007-11-15 11:13:05 +01002715
Charles Manning3796e1f2012-05-09 16:55:17 +00002716 threshold = background ? (dev->gc_not_done + 2) * 2 : 0;
2717 if (threshold < YAFFS_GC_PASSIVE_THRESHOLD)
2718 threshold = YAFFS_GC_PASSIVE_THRESHOLD;
2719 if (threshold > max_threshold)
2720 threshold = max_threshold;
William Juulc051bbe2007-11-15 11:13:05 +01002721
Charles Manning3796e1f2012-05-09 16:55:17 +00002722 iterations = n_blocks / 16 + 1;
2723 if (iterations > 100)
2724 iterations = 100;
William Juulc051bbe2007-11-15 11:13:05 +01002725 }
William Juulc051bbe2007-11-15 11:13:05 +01002726
Charles Manning3796e1f2012-05-09 16:55:17 +00002727 for (i = 0;
2728 i < iterations &&
2729 (dev->gc_dirtiest < 1 ||
2730 dev->gc_pages_in_use > YAFFS_GC_GOOD_ENOUGH);
2731 i++) {
2732 dev->gc_block_finder++;
2733 if (dev->gc_block_finder < dev->internal_start_block ||
2734 dev->gc_block_finder > dev->internal_end_block)
2735 dev->gc_block_finder =
2736 dev->internal_start_block;
2737
2738 bi = yaffs_get_block_info(dev, dev->gc_block_finder);
2739
2740 pages_used = bi->pages_in_use - bi->soft_del_pages;
2741
2742 if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
2743 pages_used < dev->param.chunks_per_block &&
2744 (dev->gc_dirtiest < 1 ||
2745 pages_used < dev->gc_pages_in_use) &&
2746 yaffs_block_ok_for_gc(dev, bi)) {
2747 dev->gc_dirtiest = dev->gc_block_finder;
2748 dev->gc_pages_in_use = pages_used;
2749 }
William Juulc051bbe2007-11-15 11:13:05 +01002750 }
William Juulc051bbe2007-11-15 11:13:05 +01002751
Charles Manning3796e1f2012-05-09 16:55:17 +00002752 if (dev->gc_dirtiest > 0 && dev->gc_pages_in_use <= threshold)
2753 selected = dev->gc_dirtiest;
2754 }
William Juulc051bbe2007-11-15 11:13:05 +01002755
Charles Manning3796e1f2012-05-09 16:55:17 +00002756 /*
2757 * If nothing has been selected for a while, try the oldest dirty
2758 * because that's gumming up the works.
2759 */
William Juulc051bbe2007-11-15 11:13:05 +01002760
Charles Manning3796e1f2012-05-09 16:55:17 +00002761 if (!selected && dev->param.is_yaffs2 &&
2762 dev->gc_not_done >= (background ? 10 : 20)) {
2763 yaffs2_find_oldest_dirty_seq(dev);
2764 if (dev->oldest_dirty_block > 0) {
2765 selected = dev->oldest_dirty_block;
2766 dev->gc_dirtiest = selected;
2767 dev->oldest_dirty_gc_count++;
2768 bi = yaffs_get_block_info(dev, selected);
2769 dev->gc_pages_in_use =
2770 bi->pages_in_use - bi->soft_del_pages;
2771 } else {
2772 dev->gc_not_done = 0;
2773 }
William Juulc051bbe2007-11-15 11:13:05 +01002774 }
2775
Charles Manning3796e1f2012-05-09 16:55:17 +00002776 if (selected) {
2777 yaffs_trace(YAFFS_TRACE_GC,
2778 "GC Selected block %d with %d free, prioritised:%d",
2779 selected,
2780 dev->param.chunks_per_block - dev->gc_pages_in_use,
2781 prioritised);
William Juulc051bbe2007-11-15 11:13:05 +01002782
Charles Manning3796e1f2012-05-09 16:55:17 +00002783 dev->n_gc_blocks++;
2784 if (background)
2785 dev->bg_gcs++;
William Juulc051bbe2007-11-15 11:13:05 +01002786
Charles Manning3796e1f2012-05-09 16:55:17 +00002787 dev->gc_dirtiest = 0;
2788 dev->gc_pages_in_use = 0;
2789 dev->gc_not_done = 0;
2790 if (dev->refresh_skip > 0)
2791 dev->refresh_skip--;
2792 } else {
2793 dev->gc_not_done++;
2794 yaffs_trace(YAFFS_TRACE_GC,
2795 "GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s",
2796 dev->gc_block_finder, dev->gc_not_done, threshold,
2797 dev->gc_dirtiest, dev->gc_pages_in_use,
2798 dev->oldest_dirty_block, background ? " bg" : "");
2799 }
William Juulc051bbe2007-11-15 11:13:05 +01002800
Charles Manning3796e1f2012-05-09 16:55:17 +00002801 return selected;
2802}
William Juulc051bbe2007-11-15 11:13:05 +01002803
Charles Manning3796e1f2012-05-09 16:55:17 +00002804/* New garbage collector
2805 * If we're very low on erased blocks then we do aggressive garbage collection
2806 * otherwise we do "leasurely" garbage collection.
2807 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
2808 * Passive gc only inspects smaller areas and only accepts more dirty blocks.
2809 *
2810 * The idea is to help clear out space in a more spread-out manner.
2811 * Dunno if it really does anything useful.
2812 */
2813static int yaffs_check_gc(struct yaffs_dev *dev, int background)
William Juulc051bbe2007-11-15 11:13:05 +01002814{
Charles Manning3796e1f2012-05-09 16:55:17 +00002815 int aggressive = 0;
2816 int gc_ok = YAFFS_OK;
2817 int max_tries = 0;
2818 int min_erased;
2819 int erased_chunks;
2820 int checkpt_block_adjust;
William Juulc051bbe2007-11-15 11:13:05 +01002821
Charles Manning3796e1f2012-05-09 16:55:17 +00002822 if (dev->param.gc_control && (dev->param.gc_control(dev) & 1) == 0)
2823 return YAFFS_OK;
William Juulc051bbe2007-11-15 11:13:05 +01002824
Charles Manning3796e1f2012-05-09 16:55:17 +00002825 if (dev->gc_disable)
2826 /* Bail out so we don't get recursive gc */
2827 return YAFFS_OK;
William Juulc051bbe2007-11-15 11:13:05 +01002828
Charles Manning3796e1f2012-05-09 16:55:17 +00002829 /* This loop should pass the first time.
2830 * Only loops here if the collection does not increase space.
William Juulc051bbe2007-11-15 11:13:05 +01002831 */
William Juulc051bbe2007-11-15 11:13:05 +01002832
Charles Manning3796e1f2012-05-09 16:55:17 +00002833 do {
2834 max_tries++;
William Juulc051bbe2007-11-15 11:13:05 +01002835
Charles Manning3796e1f2012-05-09 16:55:17 +00002836 checkpt_block_adjust = yaffs_calc_checkpt_blocks_required(dev);
William Juulc051bbe2007-11-15 11:13:05 +01002837
Charles Manning3796e1f2012-05-09 16:55:17 +00002838 min_erased =
2839 dev->param.n_reserved_blocks + checkpt_block_adjust + 1;
2840 erased_chunks =
2841 dev->n_erased_blocks * dev->param.chunks_per_block;
William Juulc051bbe2007-11-15 11:13:05 +01002842
Charles Manning3796e1f2012-05-09 16:55:17 +00002843 /* If we need a block soon then do aggressive gc. */
2844 if (dev->n_erased_blocks < min_erased)
2845 aggressive = 1;
2846 else {
2847 if (!background
2848 && erased_chunks > (dev->n_free_chunks / 4))
2849 break;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02002850
Charles Manning3796e1f2012-05-09 16:55:17 +00002851 if (dev->gc_skip > 20)
2852 dev->gc_skip = 20;
2853 if (erased_chunks < dev->n_free_chunks / 2 ||
2854 dev->gc_skip < 1 || background)
2855 aggressive = 0;
2856 else {
2857 dev->gc_skip--;
2858 break;
2859 }
2860 }
William Juulc051bbe2007-11-15 11:13:05 +01002861
Charles Manning3796e1f2012-05-09 16:55:17 +00002862 dev->gc_skip = 5;
William Juulc051bbe2007-11-15 11:13:05 +01002863
Charles Manning3796e1f2012-05-09 16:55:17 +00002864 /* If we don't already have a block being gc'd then see if we
2865 * should start another */
William Juulc051bbe2007-11-15 11:13:05 +01002866
Charles Manning3796e1f2012-05-09 16:55:17 +00002867 if (dev->gc_block < 1 && !aggressive) {
2868 dev->gc_block = yaffs2_find_refresh_block(dev);
2869 dev->gc_chunk = 0;
2870 dev->n_clean_ups = 0;
2871 }
2872 if (dev->gc_block < 1) {
2873 dev->gc_block =
2874 yaffs_find_gc_block(dev, aggressive, background);
2875 dev->gc_chunk = 0;
2876 dev->n_clean_ups = 0;
William Juulc051bbe2007-11-15 11:13:05 +01002877 }
2878
Charles Manning3796e1f2012-05-09 16:55:17 +00002879 if (dev->gc_block > 0) {
2880 dev->all_gcs++;
2881 if (!aggressive)
2882 dev->passive_gc_count++;
William Juulc051bbe2007-11-15 11:13:05 +01002883
Charles Manning3796e1f2012-05-09 16:55:17 +00002884 yaffs_trace(YAFFS_TRACE_GC,
2885 "yaffs: GC n_erased_blocks %d aggressive %d",
2886 dev->n_erased_blocks, aggressive);
William Juulc051bbe2007-11-15 11:13:05 +01002887
Charles Manning3796e1f2012-05-09 16:55:17 +00002888 gc_ok = yaffs_gc_block(dev, dev->gc_block, aggressive);
2889 }
William Juulc051bbe2007-11-15 11:13:05 +01002890
Charles Manning3796e1f2012-05-09 16:55:17 +00002891 if (dev->n_erased_blocks < (dev->param.n_reserved_blocks) &&
2892 dev->gc_block > 0) {
2893 yaffs_trace(YAFFS_TRACE_GC,
2894 "yaffs: GC !!!no reclaim!!! n_erased_blocks %d after try %d block %d",
2895 dev->n_erased_blocks, max_tries,
2896 dev->gc_block);
2897 }
2898 } while ((dev->n_erased_blocks < dev->param.n_reserved_blocks) &&
2899 (dev->gc_block > 0) && (max_tries < 2));
William Juulc051bbe2007-11-15 11:13:05 +01002900
Charles Manning3796e1f2012-05-09 16:55:17 +00002901 return aggressive ? gc_ok : YAFFS_OK;
2902}
William Juulc051bbe2007-11-15 11:13:05 +01002903
Charles Manning3796e1f2012-05-09 16:55:17 +00002904/*
2905 * yaffs_bg_gc()
2906 * Garbage collects. Intended to be called from a background thread.
2907 * Returns non-zero if at least half the free chunks are erased.
2908 */
2909int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency)
2910{
2911 int erased_chunks = dev->n_erased_blocks * dev->param.chunks_per_block;
William Juulc051bbe2007-11-15 11:13:05 +01002912
Charles Manning3796e1f2012-05-09 16:55:17 +00002913 yaffs_trace(YAFFS_TRACE_BACKGROUND, "Background gc %u", urgency);
William Juulc051bbe2007-11-15 11:13:05 +01002914
Charles Manning3796e1f2012-05-09 16:55:17 +00002915 yaffs_check_gc(dev, 1);
2916 return erased_chunks > dev->n_free_chunks / 2;
William Juulc051bbe2007-11-15 11:13:05 +01002917}
2918
Charles Manning3796e1f2012-05-09 16:55:17 +00002919/*-------------------- Data file manipulation -----------------*/
2920
2921static int yaffs_rd_data_obj(struct yaffs_obj *in, int inode_chunk, u8 * buffer)
William Juulc051bbe2007-11-15 11:13:05 +01002922{
Charles Manning3796e1f2012-05-09 16:55:17 +00002923 int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL);
William Juulc051bbe2007-11-15 11:13:05 +01002924
Charles Manning3796e1f2012-05-09 16:55:17 +00002925 if (nand_chunk >= 0)
2926 return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk,
2927 buffer, NULL);
2928 else {
2929 yaffs_trace(YAFFS_TRACE_NANDACCESS,
2930 "Chunk %d not found zero instead",
2931 nand_chunk);
2932 /* get sane (zero) data if you read a hole */
2933 memset(buffer, 0, in->my_dev->data_bytes_per_chunk);
2934 return 0;
2935 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02002936
Charles Manning3796e1f2012-05-09 16:55:17 +00002937}
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02002938
Charles Manning3796e1f2012-05-09 16:55:17 +00002939void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash,
2940 int lyn)
2941{
2942 int block;
2943 int page;
2944 struct yaffs_ext_tags tags;
2945 struct yaffs_block_info *bi;
William Juulc051bbe2007-11-15 11:13:05 +01002946
Charles Manning3796e1f2012-05-09 16:55:17 +00002947 if (chunk_id <= 0)
2948 return;
William Juulc051bbe2007-11-15 11:13:05 +01002949
Charles Manning3796e1f2012-05-09 16:55:17 +00002950 dev->n_deletions++;
2951 block = chunk_id / dev->param.chunks_per_block;
2952 page = chunk_id % dev->param.chunks_per_block;
William Juulc051bbe2007-11-15 11:13:05 +01002953
Charles Manning3796e1f2012-05-09 16:55:17 +00002954 if (!yaffs_check_chunk_bit(dev, block, page))
2955 yaffs_trace(YAFFS_TRACE_VERIFY,
2956 "Deleting invalid chunk %d", chunk_id);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02002957
Charles Manning3796e1f2012-05-09 16:55:17 +00002958 bi = yaffs_get_block_info(dev, block);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02002959
Charles Manning3796e1f2012-05-09 16:55:17 +00002960 yaffs2_update_oldest_dirty_seq(dev, block, bi);
William Juulc051bbe2007-11-15 11:13:05 +01002961
Charles Manning3796e1f2012-05-09 16:55:17 +00002962 yaffs_trace(YAFFS_TRACE_DELETION,
2963 "line %d delete of chunk %d",
2964 lyn, chunk_id);
William Juulc051bbe2007-11-15 11:13:05 +01002965
Charles Manning3796e1f2012-05-09 16:55:17 +00002966 if (!dev->param.is_yaffs2 && mark_flash &&
2967 bi->block_state != YAFFS_BLOCK_STATE_COLLECTING) {
William Juulc051bbe2007-11-15 11:13:05 +01002968
Charles Manning3796e1f2012-05-09 16:55:17 +00002969 memset(&tags, 0, sizeof(tags));
2970 tags.is_deleted = 1;
2971 yaffs_wr_chunk_tags_nand(dev, chunk_id, NULL, &tags);
2972 yaffs_handle_chunk_update(dev, chunk_id, &tags);
2973 } else {
2974 dev->n_unmarked_deletions++;
William Juulc051bbe2007-11-15 11:13:05 +01002975 }
2976
Charles Manning3796e1f2012-05-09 16:55:17 +00002977 /* Pull out of the management area.
2978 * If the whole block became dirty, this will kick off an erasure.
2979 */
2980 if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING ||
2981 bi->block_state == YAFFS_BLOCK_STATE_FULL ||
2982 bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN ||
2983 bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
2984 dev->n_free_chunks++;
2985 yaffs_clear_chunk_bit(dev, block, page);
2986 bi->pages_in_use--;
William Juulc051bbe2007-11-15 11:13:05 +01002987
Charles Manning3796e1f2012-05-09 16:55:17 +00002988 if (bi->pages_in_use == 0 &&
2989 !bi->has_shrink_hdr &&
2990 bi->block_state != YAFFS_BLOCK_STATE_ALLOCATING &&
2991 bi->block_state != YAFFS_BLOCK_STATE_NEEDS_SCAN) {
2992 yaffs_block_became_dirty(dev, block);
2993 }
2994 }
2995}
William Juulc051bbe2007-11-15 11:13:05 +01002996
Charles Manning3796e1f2012-05-09 16:55:17 +00002997static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
2998 const u8 *buffer, int n_bytes, int use_reserve)
2999{
3000 /* Find old chunk Need to do this to get serial number
3001 * Write new one and patch into tree.
3002 * Invalidate old tags.
3003 */
William Juulc051bbe2007-11-15 11:13:05 +01003004
Charles Manning3796e1f2012-05-09 16:55:17 +00003005 int prev_chunk_id;
3006 struct yaffs_ext_tags prev_tags;
3007 int new_chunk_id;
3008 struct yaffs_ext_tags new_tags;
3009 struct yaffs_dev *dev = in->my_dev;
William Juulc051bbe2007-11-15 11:13:05 +01003010
Charles Manning3796e1f2012-05-09 16:55:17 +00003011 yaffs_check_gc(dev, 0);
William Juulc051bbe2007-11-15 11:13:05 +01003012
Charles Manning3796e1f2012-05-09 16:55:17 +00003013 /* Get the previous chunk at this location in the file if it exists.
3014 * If it does not exist then put a zero into the tree. This creates
3015 * the tnode now, rather than later when it is harder to clean up.
3016 */
3017 prev_chunk_id = yaffs_find_chunk_in_file(in, inode_chunk, &prev_tags);
3018 if (prev_chunk_id < 1 &&
3019 !yaffs_put_chunk_in_file(in, inode_chunk, 0, 0))
3020 return 0;
William Juulc051bbe2007-11-15 11:13:05 +01003021
Charles Manning3796e1f2012-05-09 16:55:17 +00003022 /* Set up new tags */
3023 memset(&new_tags, 0, sizeof(new_tags));
William Juulc051bbe2007-11-15 11:13:05 +01003024
Charles Manning3796e1f2012-05-09 16:55:17 +00003025 new_tags.chunk_id = inode_chunk;
3026 new_tags.obj_id = in->obj_id;
3027 new_tags.serial_number =
3028 (prev_chunk_id > 0) ? prev_tags.serial_number + 1 : 1;
3029 new_tags.n_bytes = n_bytes;
William Juulc051bbe2007-11-15 11:13:05 +01003030
Charles Manning3796e1f2012-05-09 16:55:17 +00003031 if (n_bytes < 1 || n_bytes > dev->param.total_bytes_per_chunk) {
3032 yaffs_trace(YAFFS_TRACE_ERROR,
3033 "Writing %d bytes to chunk!!!!!!!!!",
3034 n_bytes);
3035 BUG();
William Juulc051bbe2007-11-15 11:13:05 +01003036 }
3037
Charles Manning3796e1f2012-05-09 16:55:17 +00003038 new_chunk_id =
3039 yaffs_write_new_chunk(dev, buffer, &new_tags, use_reserve);
William Juulc051bbe2007-11-15 11:13:05 +01003040
Charles Manning3796e1f2012-05-09 16:55:17 +00003041 if (new_chunk_id > 0) {
3042 yaffs_put_chunk_in_file(in, inode_chunk, new_chunk_id, 0);
William Juulc051bbe2007-11-15 11:13:05 +01003043
Charles Manning3796e1f2012-05-09 16:55:17 +00003044 if (prev_chunk_id > 0)
3045 yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
3046
3047 yaffs_verify_file_sane(in);
William Juulc051bbe2007-11-15 11:13:05 +01003048 }
Charles Manning3796e1f2012-05-09 16:55:17 +00003049 return new_chunk_id;
William Juulc051bbe2007-11-15 11:13:05 +01003050
Charles Manning3796e1f2012-05-09 16:55:17 +00003051}
William Juulc051bbe2007-11-15 11:13:05 +01003052
William Juulc051bbe2007-11-15 11:13:05 +01003053
William Juulc051bbe2007-11-15 11:13:05 +01003054
Charles Manning3796e1f2012-05-09 16:55:17 +00003055static int yaffs_do_xattrib_mod(struct yaffs_obj *obj, int set,
3056 const YCHAR *name, const void *value, int size,
3057 int flags)
3058{
3059 struct yaffs_xattr_mod xmod;
3060 int result;
William Juulc051bbe2007-11-15 11:13:05 +01003061
Charles Manning3796e1f2012-05-09 16:55:17 +00003062 xmod.set = set;
3063 xmod.name = name;
3064 xmod.data = value;
3065 xmod.size = size;
3066 xmod.flags = flags;
3067 xmod.result = -ENOSPC;
William Juulc051bbe2007-11-15 11:13:05 +01003068
Charles Manning3796e1f2012-05-09 16:55:17 +00003069 result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod);
William Juulc051bbe2007-11-15 11:13:05 +01003070
Charles Manning3796e1f2012-05-09 16:55:17 +00003071 if (result > 0)
3072 return xmod.result;
3073 else
3074 return -ENOSPC;
3075}
William Juulc051bbe2007-11-15 11:13:05 +01003076
Charles Manning3796e1f2012-05-09 16:55:17 +00003077static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer,
3078 struct yaffs_xattr_mod *xmod)
3079{
3080 int retval = 0;
3081 int x_offs = sizeof(struct yaffs_obj_hdr);
3082 struct yaffs_dev *dev = obj->my_dev;
3083 int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
3084 char *x_buffer = buffer + x_offs;
William Juulc051bbe2007-11-15 11:13:05 +01003085
Charles Manning3796e1f2012-05-09 16:55:17 +00003086 if (xmod->set)
3087 retval =
3088 nval_set(x_buffer, x_size, xmod->name, xmod->data,
3089 xmod->size, xmod->flags);
3090 else
3091 retval = nval_del(x_buffer, x_size, xmod->name);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003092
Charles Manning3796e1f2012-05-09 16:55:17 +00003093 obj->has_xattr = nval_hasvalues(x_buffer, x_size);
3094 obj->xattr_known = 1;
3095 xmod->result = retval;
William Juulc051bbe2007-11-15 11:13:05 +01003096
Charles Manning3796e1f2012-05-09 16:55:17 +00003097 return retval;
3098}
William Juulc051bbe2007-11-15 11:13:05 +01003099
Charles Manning3796e1f2012-05-09 16:55:17 +00003100static int yaffs_do_xattrib_fetch(struct yaffs_obj *obj, const YCHAR *name,
3101 void *value, int size)
3102{
3103 char *buffer = NULL;
3104 int result;
3105 struct yaffs_ext_tags tags;
3106 struct yaffs_dev *dev = obj->my_dev;
3107 int x_offs = sizeof(struct yaffs_obj_hdr);
3108 int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
3109 char *x_buffer;
3110 int retval = 0;
William Juulc051bbe2007-11-15 11:13:05 +01003111
Charles Manning3796e1f2012-05-09 16:55:17 +00003112 if (obj->hdr_chunk < 1)
3113 return -ENODATA;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003114
Charles Manning3796e1f2012-05-09 16:55:17 +00003115 /* If we know that the object has no xattribs then don't do all the
3116 * reading and parsing.
3117 */
3118 if (obj->xattr_known && !obj->has_xattr) {
3119 if (name)
3120 return -ENODATA;
3121 else
3122 return 0;
3123 }
William Juulc051bbe2007-11-15 11:13:05 +01003124
Charles Manning3796e1f2012-05-09 16:55:17 +00003125 buffer = (char *)yaffs_get_temp_buffer(dev);
3126 if (!buffer)
3127 return -ENOMEM;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003128
Charles Manning3796e1f2012-05-09 16:55:17 +00003129 result =
3130 yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, (u8 *) buffer, &tags);
William Juulc051bbe2007-11-15 11:13:05 +01003131
Charles Manning3796e1f2012-05-09 16:55:17 +00003132 if (result != YAFFS_OK)
3133 retval = -ENOENT;
3134 else {
3135 x_buffer = buffer + x_offs;
William Juulc051bbe2007-11-15 11:13:05 +01003136
Charles Manning3796e1f2012-05-09 16:55:17 +00003137 if (!obj->xattr_known) {
3138 obj->has_xattr = nval_hasvalues(x_buffer, x_size);
3139 obj->xattr_known = 1;
3140 }
William Juulc051bbe2007-11-15 11:13:05 +01003141
Charles Manning3796e1f2012-05-09 16:55:17 +00003142 if (name)
3143 retval = nval_get(x_buffer, x_size, name, value, size);
3144 else
3145 retval = nval_list(x_buffer, x_size, value, size);
3146 }
3147 yaffs_release_temp_buffer(dev, (u8 *) buffer);
3148 return retval;
3149}
William Juulc051bbe2007-11-15 11:13:05 +01003150
Charles Manning3796e1f2012-05-09 16:55:17 +00003151int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR * name,
3152 const void *value, int size, int flags)
3153{
3154 return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags);
3155}
William Juulc051bbe2007-11-15 11:13:05 +01003156
Charles Manning3796e1f2012-05-09 16:55:17 +00003157int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR * name)
3158{
3159 return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0);
3160}
William Juulc051bbe2007-11-15 11:13:05 +01003161
Charles Manning3796e1f2012-05-09 16:55:17 +00003162int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR * name, void *value,
3163 int size)
3164{
3165 return yaffs_do_xattrib_fetch(obj, name, value, size);
3166}
William Juulc051bbe2007-11-15 11:13:05 +01003167
Charles Manning3796e1f2012-05-09 16:55:17 +00003168int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size)
3169{
3170 return yaffs_do_xattrib_fetch(obj, NULL, buffer, size);
3171}
William Juulc051bbe2007-11-15 11:13:05 +01003172
Charles Manning3796e1f2012-05-09 16:55:17 +00003173static void yaffs_check_obj_details_loaded(struct yaffs_obj *in)
3174{
3175 u8 *buf;
3176 struct yaffs_obj_hdr *oh;
3177 struct yaffs_dev *dev;
3178 struct yaffs_ext_tags tags;
3179 int result;
3180 int alloc_failed = 0;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003181
Charles Manning3796e1f2012-05-09 16:55:17 +00003182 if (!in || !in->lazy_loaded || in->hdr_chunk < 1)
3183 return;
William Juulc051bbe2007-11-15 11:13:05 +01003184
Charles Manning3796e1f2012-05-09 16:55:17 +00003185 dev = in->my_dev;
3186 in->lazy_loaded = 0;
3187 buf = yaffs_get_temp_buffer(dev);
William Juulc051bbe2007-11-15 11:13:05 +01003188
Charles Manning3796e1f2012-05-09 16:55:17 +00003189 result = yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, buf, &tags);
3190 oh = (struct yaffs_obj_hdr *)buf;
William Juulc051bbe2007-11-15 11:13:05 +01003191
Charles Manning3796e1f2012-05-09 16:55:17 +00003192 in->yst_mode = oh->yst_mode;
3193 yaffs_load_attribs(in, oh);
3194 yaffs_set_obj_name_from_oh(in, oh);
William Juulc051bbe2007-11-15 11:13:05 +01003195
Charles Manning3796e1f2012-05-09 16:55:17 +00003196 if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
3197 in->variant.symlink_variant.alias =
3198 yaffs_clone_str(oh->alias);
3199 if (!in->variant.symlink_variant.alias)
3200 alloc_failed = 1; /* Not returned */
3201 }
3202 yaffs_release_temp_buffer(dev, buf);
3203}
William Juulc051bbe2007-11-15 11:13:05 +01003204
Charles Manning3796e1f2012-05-09 16:55:17 +00003205static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR *name,
3206 const YCHAR *oh_name, int buff_size)
3207{
3208#ifdef CONFIG_YAFFS_AUTO_UNICODE
3209 if (dev->param.auto_unicode) {
3210 if (*oh_name) {
3211 /* It is an ASCII name, do an ASCII to
3212 * unicode conversion */
3213 const char *ascii_oh_name = (const char *)oh_name;
3214 int n = buff_size - 1;
3215 while (n > 0 && *ascii_oh_name) {
3216 *name = *ascii_oh_name;
3217 name++;
3218 ascii_oh_name++;
3219 n--;
3220 }
3221 } else {
3222 yaffs_strncpy(name, oh_name + 1, buff_size - 1);
3223 }
3224 } else {
William Juulc051bbe2007-11-15 11:13:05 +01003225#else
Charles Manning3796e1f2012-05-09 16:55:17 +00003226 dev = dev;
3227 {
William Juulc051bbe2007-11-15 11:13:05 +01003228#endif
Charles Manning3796e1f2012-05-09 16:55:17 +00003229 yaffs_strncpy(name, oh_name, buff_size - 1);
3230 }
3231}
3232
3233static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR *oh_name,
3234 const YCHAR *name)
3235{
3236#ifdef CONFIG_YAFFS_AUTO_UNICODE
3237
3238 int is_ascii;
3239 YCHAR *w;
William Juulc051bbe2007-11-15 11:13:05 +01003240
Charles Manning3796e1f2012-05-09 16:55:17 +00003241 if (dev->param.auto_unicode) {
William Juulc051bbe2007-11-15 11:13:05 +01003242
Charles Manning3796e1f2012-05-09 16:55:17 +00003243 is_ascii = 1;
3244 w = name;
William Juulc051bbe2007-11-15 11:13:05 +01003245
Charles Manning3796e1f2012-05-09 16:55:17 +00003246 /* Figure out if the name will fit in ascii character set */
3247 while (is_ascii && *w) {
3248 if ((*w) & 0xff00)
3249 is_ascii = 0;
3250 w++;
3251 }
3252
3253 if (is_ascii) {
3254 /* It is an ASCII name, so convert unicode to ascii */
3255 char *ascii_oh_name = (char *)oh_name;
3256 int n = YAFFS_MAX_NAME_LENGTH - 1;
3257 while (n > 0 && *name) {
3258 *ascii_oh_name = *name;
3259 name++;
3260 ascii_oh_name++;
3261 n--;
3262 }
3263 } else {
3264 /* Unicode name, so save starting at the second YCHAR */
3265 *oh_name = 0;
3266 yaffs_strncpy(oh_name + 1, name, YAFFS_MAX_NAME_LENGTH - 2);
3267 }
3268 } else {
William Juulc051bbe2007-11-15 11:13:05 +01003269#else
Charles Manning3796e1f2012-05-09 16:55:17 +00003270 dev = dev;
3271 {
William Juulc051bbe2007-11-15 11:13:05 +01003272#endif
Charles Manning3796e1f2012-05-09 16:55:17 +00003273 yaffs_strncpy(oh_name, name, YAFFS_MAX_NAME_LENGTH - 1);
3274 }
3275}
3276
3277/* UpdateObjectHeader updates the header on NAND for an object.
3278 * If name is not NULL, then that new name is used.
3279 */
3280int yaffs_update_oh(struct yaffs_obj *in, const YCHAR *name, int force,
3281 int is_shrink, int shadows, struct yaffs_xattr_mod *xmod)
3282{
William Juulc051bbe2007-11-15 11:13:05 +01003283
Charles Manning3796e1f2012-05-09 16:55:17 +00003284 struct yaffs_block_info *bi;
3285 struct yaffs_dev *dev = in->my_dev;
3286 int prev_chunk_id;
3287 int ret_val = 0;
3288 int result = 0;
3289 int new_chunk_id;
3290 struct yaffs_ext_tags new_tags;
3291 struct yaffs_ext_tags old_tags;
3292 const YCHAR *alias = NULL;
3293 u8 *buffer = NULL;
3294 YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1];
3295 struct yaffs_obj_hdr *oh = NULL;
3296 loff_t file_size = 0;
William Juulc051bbe2007-11-15 11:13:05 +01003297
Charles Manning3796e1f2012-05-09 16:55:17 +00003298 yaffs_strcpy(old_name, _Y("silly old name"));
William Juulc051bbe2007-11-15 11:13:05 +01003299
Charles Manning3796e1f2012-05-09 16:55:17 +00003300 if (in->fake && in != dev->root_dir && !force && !xmod)
3301 return ret_val;
William Juulc051bbe2007-11-15 11:13:05 +01003302
Charles Manning3796e1f2012-05-09 16:55:17 +00003303 yaffs_check_gc(dev, 0);
3304 yaffs_check_obj_details_loaded(in);
William Juulc051bbe2007-11-15 11:13:05 +01003305
Charles Manning3796e1f2012-05-09 16:55:17 +00003306 buffer = yaffs_get_temp_buffer(in->my_dev);
3307 oh = (struct yaffs_obj_hdr *)buffer;
William Juulc051bbe2007-11-15 11:13:05 +01003308
Charles Manning3796e1f2012-05-09 16:55:17 +00003309 prev_chunk_id = in->hdr_chunk;
3310
3311 if (prev_chunk_id > 0) {
3312 result = yaffs_rd_chunk_tags_nand(dev, prev_chunk_id,
3313 buffer, &old_tags);
3314
3315 yaffs_verify_oh(in, oh, &old_tags, 0);
3316 memcpy(old_name, oh->name, sizeof(oh->name));
3317 memset(buffer, 0xff, sizeof(struct yaffs_obj_hdr));
3318 } else {
3319 memset(buffer, 0xff, dev->data_bytes_per_chunk);
3320 }
3321
3322 oh->type = in->variant_type;
3323 oh->yst_mode = in->yst_mode;
3324 oh->shadows_obj = oh->inband_shadowed_obj_id = shadows;
3325
3326 yaffs_load_attribs_oh(oh, in);
3327
3328 if (in->parent)
3329 oh->parent_obj_id = in->parent->obj_id;
3330 else
3331 oh->parent_obj_id = 0;
3332
3333 if (name && *name) {
3334 memset(oh->name, 0, sizeof(oh->name));
3335 yaffs_load_oh_from_name(dev, oh->name, name);
3336 } else if (prev_chunk_id > 0) {
3337 memcpy(oh->name, old_name, sizeof(oh->name));
3338 } else {
3339 memset(oh->name, 0, sizeof(oh->name));
3340 }
3341
3342 oh->is_shrink = is_shrink;
3343
3344 switch (in->variant_type) {
3345 case YAFFS_OBJECT_TYPE_UNKNOWN:
3346 /* Should not happen */
3347 break;
3348 case YAFFS_OBJECT_TYPE_FILE:
3349 if (oh->parent_obj_id != YAFFS_OBJECTID_DELETED &&
3350 oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED)
3351 file_size = in->variant.file_variant.file_size;
3352 yaffs_oh_size_load(oh, file_size);
3353 break;
3354 case YAFFS_OBJECT_TYPE_HARDLINK:
3355 oh->equiv_id = in->variant.hardlink_variant.equiv_id;
3356 break;
3357 case YAFFS_OBJECT_TYPE_SPECIAL:
3358 /* Do nothing */
3359 break;
3360 case YAFFS_OBJECT_TYPE_DIRECTORY:
3361 /* Do nothing */
3362 break;
3363 case YAFFS_OBJECT_TYPE_SYMLINK:
3364 alias = in->variant.symlink_variant.alias;
3365 if (!alias)
3366 alias = _Y("no alias");
3367 yaffs_strncpy(oh->alias, alias, YAFFS_MAX_ALIAS_LENGTH);
3368 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3369 break;
3370 }
William Juulc051bbe2007-11-15 11:13:05 +01003371
Charles Manning3796e1f2012-05-09 16:55:17 +00003372 /* process any xattrib modifications */
3373 if (xmod)
3374 yaffs_apply_xattrib_mod(in, (char *)buffer, xmod);
William Juulc051bbe2007-11-15 11:13:05 +01003375
Charles Manning3796e1f2012-05-09 16:55:17 +00003376 /* Tags */
3377 memset(&new_tags, 0, sizeof(new_tags));
3378 in->serial++;
3379 new_tags.chunk_id = 0;
3380 new_tags.obj_id = in->obj_id;
3381 new_tags.serial_number = in->serial;
William Juulc051bbe2007-11-15 11:13:05 +01003382
Charles Manning3796e1f2012-05-09 16:55:17 +00003383 /* Add extra info for file header */
3384 new_tags.extra_available = 1;
3385 new_tags.extra_parent_id = oh->parent_obj_id;
3386 new_tags.extra_file_size = file_size;
3387 new_tags.extra_is_shrink = oh->is_shrink;
3388 new_tags.extra_equiv_id = oh->equiv_id;
3389 new_tags.extra_shadows = (oh->shadows_obj > 0) ? 1 : 0;
3390 new_tags.extra_obj_type = in->variant_type;
3391 yaffs_verify_oh(in, oh, &new_tags, 1);
William Juulc051bbe2007-11-15 11:13:05 +01003392
Charles Manning3796e1f2012-05-09 16:55:17 +00003393 /* Create new chunk in NAND */
3394 new_chunk_id =
3395 yaffs_write_new_chunk(dev, buffer, &new_tags,
3396 (prev_chunk_id > 0) ? 1 : 0);
William Juulc051bbe2007-11-15 11:13:05 +01003397
Charles Manning3796e1f2012-05-09 16:55:17 +00003398 if (buffer)
3399 yaffs_release_temp_buffer(dev, buffer);
William Juulc051bbe2007-11-15 11:13:05 +01003400
Charles Manning3796e1f2012-05-09 16:55:17 +00003401 if (new_chunk_id < 0)
3402 return new_chunk_id;
William Juulc051bbe2007-11-15 11:13:05 +01003403
Charles Manning3796e1f2012-05-09 16:55:17 +00003404 in->hdr_chunk = new_chunk_id;
William Juulc051bbe2007-11-15 11:13:05 +01003405
Charles Manning3796e1f2012-05-09 16:55:17 +00003406 if (prev_chunk_id > 0)
3407 yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
William Juulc051bbe2007-11-15 11:13:05 +01003408
Charles Manning3796e1f2012-05-09 16:55:17 +00003409 if (!yaffs_obj_cache_dirty(in))
3410 in->dirty = 0;
William Juulc051bbe2007-11-15 11:13:05 +01003411
Charles Manning3796e1f2012-05-09 16:55:17 +00003412 /* If this was a shrink, then mark the block
3413 * that the chunk lives on */
3414 if (is_shrink) {
3415 bi = yaffs_get_block_info(in->my_dev,
3416 new_chunk_id /
3417 in->my_dev->param.chunks_per_block);
3418 bi->has_shrink_hdr = 1;
William Juulc051bbe2007-11-15 11:13:05 +01003419 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003420
3421
Charles Manning3796e1f2012-05-09 16:55:17 +00003422 return new_chunk_id;
3423}
William Juulc051bbe2007-11-15 11:13:05 +01003424
Charles Manning3796e1f2012-05-09 16:55:17 +00003425/*--------------------- File read/write ------------------------
3426 * Read and write have very similar structures.
3427 * In general the read/write has three parts to it
3428 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
3429 * Some complete chunks
3430 * An incomplete chunk to end off with
3431 *
3432 * Curve-balls: the first chunk might also be the last chunk.
3433 */
William Juulc051bbe2007-11-15 11:13:05 +01003434
Charles Manning3796e1f2012-05-09 16:55:17 +00003435int yaffs_file_rd(struct yaffs_obj *in, u8 * buffer, loff_t offset, int n_bytes)
3436{
3437 int chunk;
3438 u32 start;
3439 int n_copy;
3440 int n = n_bytes;
3441 int n_done = 0;
3442 struct yaffs_cache *cache;
3443 struct yaffs_dev *dev;
William Juulc051bbe2007-11-15 11:13:05 +01003444
Charles Manning3796e1f2012-05-09 16:55:17 +00003445 dev = in->my_dev;
William Juulc051bbe2007-11-15 11:13:05 +01003446
Charles Manning3796e1f2012-05-09 16:55:17 +00003447 while (n > 0) {
3448 yaffs_addr_to_chunk(dev, offset, &chunk, &start);
3449 chunk++;
William Juulc051bbe2007-11-15 11:13:05 +01003450
Charles Manning3796e1f2012-05-09 16:55:17 +00003451 /* OK now check for the curveball where the start and end are in
3452 * the same chunk.
3453 */
3454 if ((start + n) < dev->data_bytes_per_chunk)
3455 n_copy = n;
3456 else
3457 n_copy = dev->data_bytes_per_chunk - start;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003458
Charles Manning3796e1f2012-05-09 16:55:17 +00003459 cache = yaffs_find_chunk_cache(in, chunk);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003460
Charles Manning3796e1f2012-05-09 16:55:17 +00003461 /* If the chunk is already in the cache or it is less than
3462 * a whole chunk or we're using inband tags then use the cache
3463 * (if there is caching) else bypass the cache.
3464 */
3465 if (cache || n_copy != dev->data_bytes_per_chunk ||
3466 dev->param.inband_tags) {
3467 if (dev->param.n_caches > 0) {
William Juulc051bbe2007-11-15 11:13:05 +01003468
Charles Manning3796e1f2012-05-09 16:55:17 +00003469 /* If we can't find the data in the cache,
3470 * then load it up. */
William Juulc051bbe2007-11-15 11:13:05 +01003471
Charles Manning3796e1f2012-05-09 16:55:17 +00003472 if (!cache) {
3473 cache =
3474 yaffs_grab_chunk_cache(in->my_dev);
3475 cache->object = in;
3476 cache->chunk_id = chunk;
3477 cache->dirty = 0;
3478 cache->locked = 0;
3479 yaffs_rd_data_obj(in, chunk,
3480 cache->data);
3481 cache->n_bytes = 0;
3482 }
William Juulc051bbe2007-11-15 11:13:05 +01003483
Charles Manning3796e1f2012-05-09 16:55:17 +00003484 yaffs_use_cache(dev, cache, 0);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003485
Charles Manning3796e1f2012-05-09 16:55:17 +00003486 cache->locked = 1;
William Juulc051bbe2007-11-15 11:13:05 +01003487
Charles Manning3796e1f2012-05-09 16:55:17 +00003488 memcpy(buffer, &cache->data[start], n_copy);
William Juulc051bbe2007-11-15 11:13:05 +01003489
Charles Manning3796e1f2012-05-09 16:55:17 +00003490 cache->locked = 0;
3491 } else {
3492 /* Read into the local buffer then copy.. */
William Juulc051bbe2007-11-15 11:13:05 +01003493
Charles Manning3796e1f2012-05-09 16:55:17 +00003494 u8 *local_buffer =
3495 yaffs_get_temp_buffer(dev);
3496 yaffs_rd_data_obj(in, chunk, local_buffer);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003497
Charles Manning3796e1f2012-05-09 16:55:17 +00003498 memcpy(buffer, &local_buffer[start], n_copy);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003499
Charles Manning3796e1f2012-05-09 16:55:17 +00003500 yaffs_release_temp_buffer(dev, local_buffer);
3501 }
3502 } else {
3503 /* A full chunk. Read directly into the buffer. */
3504 yaffs_rd_data_obj(in, chunk, buffer);
William Juulc051bbe2007-11-15 11:13:05 +01003505 }
Charles Manning3796e1f2012-05-09 16:55:17 +00003506 n -= n_copy;
3507 offset += n_copy;
3508 buffer += n_copy;
3509 n_done += n_copy;
William Juulc051bbe2007-11-15 11:13:05 +01003510 }
Charles Manning3796e1f2012-05-09 16:55:17 +00003511 return n_done;
William Juulc051bbe2007-11-15 11:13:05 +01003512}
3513
Charles Manning3796e1f2012-05-09 16:55:17 +00003514int yaffs_do_file_wr(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
3515 int n_bytes, int write_through)
William Juulc051bbe2007-11-15 11:13:05 +01003516{
William Juulc051bbe2007-11-15 11:13:05 +01003517
3518 int chunk;
Charles Manning3796e1f2012-05-09 16:55:17 +00003519 u32 start;
3520 int n_copy;
3521 int n = n_bytes;
3522 int n_done = 0;
3523 int n_writeback;
3524 loff_t start_write = offset;
3525 int chunk_written = 0;
3526 u32 n_bytes_read;
3527 loff_t chunk_start;
3528 struct yaffs_dev *dev;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003529
Charles Manning3796e1f2012-05-09 16:55:17 +00003530 dev = in->my_dev;
William Juulc051bbe2007-11-15 11:13:05 +01003531
Charles Manning3796e1f2012-05-09 16:55:17 +00003532 while (n > 0 && chunk_written >= 0) {
3533 yaffs_addr_to_chunk(dev, offset, &chunk, &start);
William Juulc051bbe2007-11-15 11:13:05 +01003534
Charles Manning3796e1f2012-05-09 16:55:17 +00003535 if (((loff_t)chunk) *
3536 dev->data_bytes_per_chunk + start != offset ||
3537 start >= dev->data_bytes_per_chunk) {
3538 yaffs_trace(YAFFS_TRACE_ERROR,
3539 "AddrToChunk of offset %lld gives chunk %d start %d",
3540 offset, chunk, start);
3541 }
3542 chunk++; /* File pos to chunk in file offset */
William Juulc051bbe2007-11-15 11:13:05 +01003543
Charles Manning3796e1f2012-05-09 16:55:17 +00003544 /* OK now check for the curveball where the start and end are in
3545 * the same chunk.
3546 */
William Juulc051bbe2007-11-15 11:13:05 +01003547
Charles Manning3796e1f2012-05-09 16:55:17 +00003548 if ((start + n) < dev->data_bytes_per_chunk) {
3549 n_copy = n;
William Juulc051bbe2007-11-15 11:13:05 +01003550
Charles Manning3796e1f2012-05-09 16:55:17 +00003551 /* Now calculate how many bytes to write back....
3552 * If we're overwriting and not writing to then end of
3553 * file then we need to write back as much as was there
3554 * before.
3555 */
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003556
Charles Manning3796e1f2012-05-09 16:55:17 +00003557 chunk_start = (((loff_t)(chunk - 1)) *
3558 dev->data_bytes_per_chunk);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003559
Charles Manning3796e1f2012-05-09 16:55:17 +00003560 if (chunk_start > in->variant.file_variant.file_size)
3561 n_bytes_read = 0; /* Past end of file */
3562 else
3563 n_bytes_read =
3564 in->variant.file_variant.file_size -
3565 chunk_start;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003566
Charles Manning3796e1f2012-05-09 16:55:17 +00003567 if (n_bytes_read > dev->data_bytes_per_chunk)
3568 n_bytes_read = dev->data_bytes_per_chunk;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003569
Charles Manning3796e1f2012-05-09 16:55:17 +00003570 n_writeback =
3571 (n_bytes_read >
3572 (start + n)) ? n_bytes_read : (start + n);
William Juulc051bbe2007-11-15 11:13:05 +01003573
Charles Manning3796e1f2012-05-09 16:55:17 +00003574 if (n_writeback < 0 ||
3575 n_writeback > dev->data_bytes_per_chunk)
3576 BUG();
William Juulc051bbe2007-11-15 11:13:05 +01003577
Charles Manning3796e1f2012-05-09 16:55:17 +00003578 } else {
3579 n_copy = dev->data_bytes_per_chunk - start;
3580 n_writeback = dev->data_bytes_per_chunk;
3581 }
William Juulc051bbe2007-11-15 11:13:05 +01003582
Charles Manning3796e1f2012-05-09 16:55:17 +00003583 if (n_copy != dev->data_bytes_per_chunk ||
3584 dev->param.inband_tags) {
3585 /* An incomplete start or end chunk (or maybe both
3586 * start and end chunk), or we're using inband tags,
3587 * so we want to use the cache buffers.
3588 */
3589 if (dev->param.n_caches > 0) {
3590 struct yaffs_cache *cache;
William Juulc051bbe2007-11-15 11:13:05 +01003591
Charles Manning3796e1f2012-05-09 16:55:17 +00003592 /* If we can't find the data in the cache, then
3593 * load the cache */
3594 cache = yaffs_find_chunk_cache(in, chunk);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003595
Charles Manning3796e1f2012-05-09 16:55:17 +00003596 if (!cache &&
3597 yaffs_check_alloc_available(dev, 1)) {
3598 cache = yaffs_grab_chunk_cache(dev);
3599 cache->object = in;
3600 cache->chunk_id = chunk;
3601 cache->dirty = 0;
3602 cache->locked = 0;
3603 yaffs_rd_data_obj(in, chunk,
3604 cache->data);
3605 } else if (cache &&
3606 !cache->dirty &&
3607 !yaffs_check_alloc_available(dev,
3608 1)) {
3609 /* Drop the cache if it was a read cache
3610 * item and no space check has been made
3611 * for it.
3612 */
3613 cache = NULL;
3614 }
William Juulc051bbe2007-11-15 11:13:05 +01003615
Charles Manning3796e1f2012-05-09 16:55:17 +00003616 if (cache) {
3617 yaffs_use_cache(dev, cache, 1);
3618 cache->locked = 1;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003619
Charles Manning3796e1f2012-05-09 16:55:17 +00003620 memcpy(&cache->data[start], buffer,
3621 n_copy);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003622
Charles Manning3796e1f2012-05-09 16:55:17 +00003623 cache->locked = 0;
3624 cache->n_bytes = n_writeback;
William Juulc051bbe2007-11-15 11:13:05 +01003625
Charles Manning3796e1f2012-05-09 16:55:17 +00003626 if (write_through) {
3627 chunk_written =
3628 yaffs_wr_data_obj
3629 (cache->object,
3630 cache->chunk_id,
3631 cache->data,
3632 cache->n_bytes, 1);
3633 cache->dirty = 0;
3634 }
3635 } else {
3636 chunk_written = -1; /* fail write */
3637 }
3638 } else {
3639 /* An incomplete start or end chunk (or maybe
3640 * both start and end chunk). Read into the
3641 * local buffer then copy over and write back.
3642 */
William Juulc051bbe2007-11-15 11:13:05 +01003643
Charles Manning3796e1f2012-05-09 16:55:17 +00003644 u8 *local_buffer = yaffs_get_temp_buffer(dev);
William Juulc051bbe2007-11-15 11:13:05 +01003645
Charles Manning3796e1f2012-05-09 16:55:17 +00003646 yaffs_rd_data_obj(in, chunk, local_buffer);
3647 memcpy(&local_buffer[start], buffer, n_copy);
William Juulc051bbe2007-11-15 11:13:05 +01003648
Charles Manning3796e1f2012-05-09 16:55:17 +00003649 chunk_written =
3650 yaffs_wr_data_obj(in, chunk,
3651 local_buffer,
3652 n_writeback, 0);
William Juulc051bbe2007-11-15 11:13:05 +01003653
Charles Manning3796e1f2012-05-09 16:55:17 +00003654 yaffs_release_temp_buffer(dev, local_buffer);
William Juulc051bbe2007-11-15 11:13:05 +01003655 }
Charles Manning3796e1f2012-05-09 16:55:17 +00003656 } else {
3657 /* A full chunk. Write directly from the buffer. */
William Juulc051bbe2007-11-15 11:13:05 +01003658
Charles Manning3796e1f2012-05-09 16:55:17 +00003659 chunk_written =
3660 yaffs_wr_data_obj(in, chunk, buffer,
3661 dev->data_bytes_per_chunk, 0);
William Juulc051bbe2007-11-15 11:13:05 +01003662
Charles Manning3796e1f2012-05-09 16:55:17 +00003663 /* Since we've overwritten the cached data,
3664 * we better invalidate it. */
3665 yaffs_invalidate_chunk_cache(in, chunk);
3666 }
William Juulc051bbe2007-11-15 11:13:05 +01003667
Charles Manning3796e1f2012-05-09 16:55:17 +00003668 if (chunk_written >= 0) {
3669 n -= n_copy;
3670 offset += n_copy;
3671 buffer += n_copy;
3672 n_done += n_copy;
3673 }
William Juulc051bbe2007-11-15 11:13:05 +01003674 }
William Juulc051bbe2007-11-15 11:13:05 +01003675
Charles Manning3796e1f2012-05-09 16:55:17 +00003676 /* Update file object */
William Juulc051bbe2007-11-15 11:13:05 +01003677
Charles Manning3796e1f2012-05-09 16:55:17 +00003678 if ((start_write + n_done) > in->variant.file_variant.file_size)
3679 in->variant.file_variant.file_size = (start_write + n_done);
William Juulc051bbe2007-11-15 11:13:05 +01003680
Charles Manning3796e1f2012-05-09 16:55:17 +00003681 in->dirty = 1;
3682 return n_done;
3683}
William Juulc051bbe2007-11-15 11:13:05 +01003684
Charles Manning3796e1f2012-05-09 16:55:17 +00003685int yaffs_wr_file(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
3686 int n_bytes, int write_through)
3687{
3688 yaffs2_handle_hole(in, offset);
3689 return yaffs_do_file_wr(in, buffer, offset, n_bytes, write_through);
3690}
William Juulc051bbe2007-11-15 11:13:05 +01003691
Charles Manning3796e1f2012-05-09 16:55:17 +00003692/* ---------------------- File resizing stuff ------------------ */
William Juulc051bbe2007-11-15 11:13:05 +01003693
Charles Manning3796e1f2012-05-09 16:55:17 +00003694static void yaffs_prune_chunks(struct yaffs_obj *in, loff_t new_size)
3695{
William Juulc051bbe2007-11-15 11:13:05 +01003696
Charles Manning3796e1f2012-05-09 16:55:17 +00003697 struct yaffs_dev *dev = in->my_dev;
3698 loff_t old_size = in->variant.file_variant.file_size;
3699 int i;
3700 int chunk_id;
3701 u32 dummy;
3702 int last_del;
3703 int start_del;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003704
Charles Manning3796e1f2012-05-09 16:55:17 +00003705 if (old_size > 0)
3706 yaffs_addr_to_chunk(dev, old_size - 1, &last_del, &dummy);
3707 else
3708 last_del = 0;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003709
Charles Manning3796e1f2012-05-09 16:55:17 +00003710 yaffs_addr_to_chunk(dev, new_size + dev->data_bytes_per_chunk - 1,
3711 &start_del, &dummy);
3712 last_del++;
3713 start_del++;
William Juulc051bbe2007-11-15 11:13:05 +01003714
Charles Manning3796e1f2012-05-09 16:55:17 +00003715 /* Delete backwards so that we don't end up with holes if
3716 * power is lost part-way through the operation.
3717 */
3718 for (i = last_del; i >= start_del; i--) {
3719 /* NB this could be optimised somewhat,
3720 * eg. could retrieve the tags and write them without
3721 * using yaffs_chunk_del
3722 */
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003723
Charles Manning3796e1f2012-05-09 16:55:17 +00003724 chunk_id = yaffs_find_del_file_chunk(in, i, NULL);
William Juulc051bbe2007-11-15 11:13:05 +01003725
Charles Manning3796e1f2012-05-09 16:55:17 +00003726 if (chunk_id < 1)
3727 continue;
William Juulc051bbe2007-11-15 11:13:05 +01003728
Charles Manning3796e1f2012-05-09 16:55:17 +00003729 if (chunk_id <
3730 (dev->internal_start_block * dev->param.chunks_per_block) ||
3731 chunk_id >=
3732 ((dev->internal_end_block + 1) *
3733 dev->param.chunks_per_block)) {
3734 yaffs_trace(YAFFS_TRACE_ALWAYS,
3735 "Found daft chunk_id %d for %d",
3736 chunk_id, i);
3737 } else {
3738 in->n_data_chunks--;
3739 yaffs_chunk_del(dev, chunk_id, 1, __LINE__);
3740 }
3741 }
3742}
William Juulc051bbe2007-11-15 11:13:05 +01003743
Charles Manning3796e1f2012-05-09 16:55:17 +00003744void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size)
3745{
3746 int new_full;
3747 u32 new_partial;
3748 struct yaffs_dev *dev = obj->my_dev;
William Juulc051bbe2007-11-15 11:13:05 +01003749
Charles Manning3796e1f2012-05-09 16:55:17 +00003750 yaffs_addr_to_chunk(dev, new_size, &new_full, &new_partial);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003751
Charles Manning3796e1f2012-05-09 16:55:17 +00003752 yaffs_prune_chunks(obj, new_size);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003753
Charles Manning3796e1f2012-05-09 16:55:17 +00003754 if (new_partial != 0) {
3755 int last_chunk = 1 + new_full;
3756 u8 *local_buffer = yaffs_get_temp_buffer(dev);
William Juulc051bbe2007-11-15 11:13:05 +01003757
Charles Manning3796e1f2012-05-09 16:55:17 +00003758 /* Rewrite the last chunk with its new size and zero pad */
3759 yaffs_rd_data_obj(obj, last_chunk, local_buffer);
3760 memset(local_buffer + new_partial, 0,
3761 dev->data_bytes_per_chunk - new_partial);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003762
Charles Manning3796e1f2012-05-09 16:55:17 +00003763 yaffs_wr_data_obj(obj, last_chunk, local_buffer,
3764 new_partial, 1);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003765
Charles Manning3796e1f2012-05-09 16:55:17 +00003766 yaffs_release_temp_buffer(dev, local_buffer);
3767 }
William Juulc051bbe2007-11-15 11:13:05 +01003768
Charles Manning3796e1f2012-05-09 16:55:17 +00003769 obj->variant.file_variant.file_size = new_size;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003770
Charles Manning3796e1f2012-05-09 16:55:17 +00003771 yaffs_prune_tree(dev, &obj->variant.file_variant);
3772}
William Juulc051bbe2007-11-15 11:13:05 +01003773
Charles Manning3796e1f2012-05-09 16:55:17 +00003774int yaffs_resize_file(struct yaffs_obj *in, loff_t new_size)
3775{
3776 struct yaffs_dev *dev = in->my_dev;
3777 loff_t old_size = in->variant.file_variant.file_size;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003778
Charles Manning3796e1f2012-05-09 16:55:17 +00003779 yaffs_flush_file_cache(in);
3780 yaffs_invalidate_whole_cache(in);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003781
Charles Manning3796e1f2012-05-09 16:55:17 +00003782 yaffs_check_gc(dev, 0);
William Juulc051bbe2007-11-15 11:13:05 +01003783
Charles Manning3796e1f2012-05-09 16:55:17 +00003784 if (in->variant_type != YAFFS_OBJECT_TYPE_FILE)
3785 return YAFFS_FAIL;
William Juulc051bbe2007-11-15 11:13:05 +01003786
Charles Manning3796e1f2012-05-09 16:55:17 +00003787 if (new_size == old_size)
3788 return YAFFS_OK;
William Juulc051bbe2007-11-15 11:13:05 +01003789
Charles Manning3796e1f2012-05-09 16:55:17 +00003790 if (new_size > old_size) {
3791 yaffs2_handle_hole(in, new_size);
3792 in->variant.file_variant.file_size = new_size;
3793 } else {
3794 /* new_size < old_size */
3795 yaffs_resize_file_down(in, new_size);
3796 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003797
Charles Manning3796e1f2012-05-09 16:55:17 +00003798 /* Write a new object header to reflect the resize.
3799 * show we've shrunk the file, if need be
3800 * Do this only if the file is not in the deleted directories
3801 * and is not shadowed.
3802 */
3803 if (in->parent &&
3804 !in->is_shadowed &&
3805 in->parent->obj_id != YAFFS_OBJECTID_UNLINKED &&
3806 in->parent->obj_id != YAFFS_OBJECTID_DELETED)
3807 yaffs_update_oh(in, NULL, 0, 0, 0, NULL);
William Juulc051bbe2007-11-15 11:13:05 +01003808
Charles Manning3796e1f2012-05-09 16:55:17 +00003809 return YAFFS_OK;
3810}
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003811
Charles Manning3796e1f2012-05-09 16:55:17 +00003812int yaffs_flush_file(struct yaffs_obj *in, int update_time, int data_sync)
3813{
3814 if (!in->dirty)
3815 return YAFFS_OK;
William Juulc051bbe2007-11-15 11:13:05 +01003816
Charles Manning3796e1f2012-05-09 16:55:17 +00003817 yaffs_flush_file_cache(in);
William Juulc051bbe2007-11-15 11:13:05 +01003818
Charles Manning3796e1f2012-05-09 16:55:17 +00003819 if (data_sync)
3820 return YAFFS_OK;
William Juulc051bbe2007-11-15 11:13:05 +01003821
Charles Manning3796e1f2012-05-09 16:55:17 +00003822 if (update_time)
3823 yaffs_load_current_time(in, 0, 0);
William Juulc051bbe2007-11-15 11:13:05 +01003824
Charles Manning3796e1f2012-05-09 16:55:17 +00003825 return (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >= 0) ?
3826 YAFFS_OK : YAFFS_FAIL;
3827}
William Juulc051bbe2007-11-15 11:13:05 +01003828
William Juulc051bbe2007-11-15 11:13:05 +01003829
Charles Manning3796e1f2012-05-09 16:55:17 +00003830/* yaffs_del_file deletes the whole file data
3831 * and the inode associated with the file.
3832 * It does not delete the links associated with the file.
3833 */
3834static int yaffs_unlink_file_if_needed(struct yaffs_obj *in)
3835{
3836 int ret_val;
3837 int del_now = 0;
3838 struct yaffs_dev *dev = in->my_dev;
William Juulc051bbe2007-11-15 11:13:05 +01003839
Charles Manning3796e1f2012-05-09 16:55:17 +00003840 if (!in->my_inode)
3841 del_now = 1;
William Juulc051bbe2007-11-15 11:13:05 +01003842
Charles Manning3796e1f2012-05-09 16:55:17 +00003843 if (del_now) {
3844 ret_val =
3845 yaffs_change_obj_name(in, in->my_dev->del_dir,
3846 _Y("deleted"), 0, 0);
3847 yaffs_trace(YAFFS_TRACE_TRACING,
3848 "yaffs: immediate deletion of file %d",
3849 in->obj_id);
3850 in->deleted = 1;
3851 in->my_dev->n_deleted_files++;
3852 if (dev->param.disable_soft_del || dev->param.is_yaffs2)
3853 yaffs_resize_file(in, 0);
3854 yaffs_soft_del_file(in);
3855 } else {
3856 ret_val =
3857 yaffs_change_obj_name(in, in->my_dev->unlinked_dir,
3858 _Y("unlinked"), 0, 0);
3859 }
3860 return ret_val;
3861}
William Juulc051bbe2007-11-15 11:13:05 +01003862
Charles Manning3796e1f2012-05-09 16:55:17 +00003863int yaffs_del_file(struct yaffs_obj *in)
3864{
3865 int ret_val = YAFFS_OK;
3866 int deleted; /* Need to cache value on stack if in is freed */
3867 struct yaffs_dev *dev = in->my_dev;
William Juulc051bbe2007-11-15 11:13:05 +01003868
Charles Manning3796e1f2012-05-09 16:55:17 +00003869 if (dev->param.disable_soft_del || dev->param.is_yaffs2)
3870 yaffs_resize_file(in, 0);
William Juulc051bbe2007-11-15 11:13:05 +01003871
Charles Manning3796e1f2012-05-09 16:55:17 +00003872 if (in->n_data_chunks > 0) {
3873 /* Use soft deletion if there is data in the file.
3874 * That won't be the case if it has been resized to zero.
3875 */
3876 if (!in->unlinked)
3877 ret_val = yaffs_unlink_file_if_needed(in);
William Juulc051bbe2007-11-15 11:13:05 +01003878
Charles Manning3796e1f2012-05-09 16:55:17 +00003879 deleted = in->deleted;
William Juulc051bbe2007-11-15 11:13:05 +01003880
Charles Manning3796e1f2012-05-09 16:55:17 +00003881 if (ret_val == YAFFS_OK && in->unlinked && !in->deleted) {
3882 in->deleted = 1;
3883 deleted = 1;
3884 in->my_dev->n_deleted_files++;
3885 yaffs_soft_del_file(in);
3886 }
3887 return deleted ? YAFFS_OK : YAFFS_FAIL;
3888 } else {
3889 /* The file has no data chunks so we toss it immediately */
3890 yaffs_free_tnode(in->my_dev, in->variant.file_variant.top);
3891 in->variant.file_variant.top = NULL;
3892 yaffs_generic_obj_del(in);
William Juulc051bbe2007-11-15 11:13:05 +01003893
Charles Manning3796e1f2012-05-09 16:55:17 +00003894 return YAFFS_OK;
3895 }
3896}
William Juulc051bbe2007-11-15 11:13:05 +01003897
Charles Manning3796e1f2012-05-09 16:55:17 +00003898int yaffs_is_non_empty_dir(struct yaffs_obj *obj)
3899{
3900 return (obj &&
3901 obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) &&
3902 !(list_empty(&obj->variant.dir_variant.children));
3903}
William Juulc051bbe2007-11-15 11:13:05 +01003904
Charles Manning3796e1f2012-05-09 16:55:17 +00003905static int yaffs_del_dir(struct yaffs_obj *obj)
3906{
3907 /* First check that the directory is empty. */
3908 if (yaffs_is_non_empty_dir(obj))
3909 return YAFFS_FAIL;
William Juulc051bbe2007-11-15 11:13:05 +01003910
Charles Manning3796e1f2012-05-09 16:55:17 +00003911 return yaffs_generic_obj_del(obj);
3912}
William Juulc051bbe2007-11-15 11:13:05 +01003913
Charles Manning3796e1f2012-05-09 16:55:17 +00003914static int yaffs_del_symlink(struct yaffs_obj *in)
3915{
3916 kfree(in->variant.symlink_variant.alias);
3917 in->variant.symlink_variant.alias = NULL;
William Juulc051bbe2007-11-15 11:13:05 +01003918
Charles Manning3796e1f2012-05-09 16:55:17 +00003919 return yaffs_generic_obj_del(in);
3920}
William Juulc051bbe2007-11-15 11:13:05 +01003921
Charles Manning3796e1f2012-05-09 16:55:17 +00003922static int yaffs_del_link(struct yaffs_obj *in)
3923{
3924 /* remove this hardlink from the list associated with the equivalent
3925 * object
3926 */
3927 list_del_init(&in->hard_links);
3928 return yaffs_generic_obj_del(in);
3929}
William Juulc051bbe2007-11-15 11:13:05 +01003930
Charles Manning3796e1f2012-05-09 16:55:17 +00003931int yaffs_del_obj(struct yaffs_obj *obj)
3932{
3933 int ret_val = -1;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003934
Charles Manning3796e1f2012-05-09 16:55:17 +00003935 switch (obj->variant_type) {
3936 case YAFFS_OBJECT_TYPE_FILE:
3937 ret_val = yaffs_del_file(obj);
3938 break;
3939 case YAFFS_OBJECT_TYPE_DIRECTORY:
3940 if (!list_empty(&obj->variant.dir_variant.dirty)) {
3941 yaffs_trace(YAFFS_TRACE_BACKGROUND,
3942 "Remove object %d from dirty directories",
3943 obj->obj_id);
3944 list_del_init(&obj->variant.dir_variant.dirty);
3945 }
3946 return yaffs_del_dir(obj);
3947 break;
3948 case YAFFS_OBJECT_TYPE_SYMLINK:
3949 ret_val = yaffs_del_symlink(obj);
3950 break;
3951 case YAFFS_OBJECT_TYPE_HARDLINK:
3952 ret_val = yaffs_del_link(obj);
3953 break;
3954 case YAFFS_OBJECT_TYPE_SPECIAL:
3955 ret_val = yaffs_generic_obj_del(obj);
3956 break;
3957 case YAFFS_OBJECT_TYPE_UNKNOWN:
3958 ret_val = 0;
3959 break; /* should not happen. */
3960 }
3961 return ret_val;
3962}
William Juulc051bbe2007-11-15 11:13:05 +01003963
Charles Manning3796e1f2012-05-09 16:55:17 +00003964static int yaffs_unlink_worker(struct yaffs_obj *obj)
3965{
3966 int del_now = 0;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003967
Charles Manning3796e1f2012-05-09 16:55:17 +00003968 if (!obj)
3969 return YAFFS_FAIL;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003970
Charles Manning3796e1f2012-05-09 16:55:17 +00003971 if (!obj->my_inode)
3972 del_now = 1;
William Juulc051bbe2007-11-15 11:13:05 +01003973
Charles Manning3796e1f2012-05-09 16:55:17 +00003974 yaffs_update_parent(obj->parent);
William Juulc051bbe2007-11-15 11:13:05 +01003975
Charles Manning3796e1f2012-05-09 16:55:17 +00003976 if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
3977 return yaffs_del_link(obj);
3978 } else if (!list_empty(&obj->hard_links)) {
3979 /* Curve ball: We're unlinking an object that has a hardlink.
3980 *
3981 * This problem arises because we are not strictly following
3982 * The Linux link/inode model.
3983 *
3984 * We can't really delete the object.
3985 * Instead, we do the following:
3986 * - Select a hardlink.
3987 * - Unhook it from the hard links
3988 * - Move it from its parent directory so that the rename works.
3989 * - Rename the object to the hardlink's name.
3990 * - Delete the hardlink
3991 */
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02003992
Charles Manning3796e1f2012-05-09 16:55:17 +00003993 struct yaffs_obj *hl;
3994 struct yaffs_obj *parent;
3995 int ret_val;
3996 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
William Juulc051bbe2007-11-15 11:13:05 +01003997
Charles Manning3796e1f2012-05-09 16:55:17 +00003998 hl = list_entry(obj->hard_links.next, struct yaffs_obj,
3999 hard_links);
William Juulc051bbe2007-11-15 11:13:05 +01004000
Charles Manning3796e1f2012-05-09 16:55:17 +00004001 yaffs_get_obj_name(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
4002 parent = hl->parent;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004003
Charles Manning3796e1f2012-05-09 16:55:17 +00004004 list_del_init(&hl->hard_links);
William Juulc051bbe2007-11-15 11:13:05 +01004005
Charles Manning3796e1f2012-05-09 16:55:17 +00004006 yaffs_add_obj_to_dir(obj->my_dev->unlinked_dir, hl);
William Juulc051bbe2007-11-15 11:13:05 +01004007
Charles Manning3796e1f2012-05-09 16:55:17 +00004008 ret_val = yaffs_change_obj_name(obj, parent, name, 0, 0);
William Juulc051bbe2007-11-15 11:13:05 +01004009
Charles Manning3796e1f2012-05-09 16:55:17 +00004010 if (ret_val == YAFFS_OK)
4011 ret_val = yaffs_generic_obj_del(hl);
William Juulc051bbe2007-11-15 11:13:05 +01004012
Charles Manning3796e1f2012-05-09 16:55:17 +00004013 return ret_val;
William Juulc051bbe2007-11-15 11:13:05 +01004014
Charles Manning3796e1f2012-05-09 16:55:17 +00004015 } else if (del_now) {
4016 switch (obj->variant_type) {
4017 case YAFFS_OBJECT_TYPE_FILE:
4018 return yaffs_del_file(obj);
4019 break;
4020 case YAFFS_OBJECT_TYPE_DIRECTORY:
4021 list_del_init(&obj->variant.dir_variant.dirty);
4022 return yaffs_del_dir(obj);
4023 break;
4024 case YAFFS_OBJECT_TYPE_SYMLINK:
4025 return yaffs_del_symlink(obj);
4026 break;
4027 case YAFFS_OBJECT_TYPE_SPECIAL:
4028 return yaffs_generic_obj_del(obj);
4029 break;
4030 case YAFFS_OBJECT_TYPE_HARDLINK:
4031 case YAFFS_OBJECT_TYPE_UNKNOWN:
4032 default:
4033 return YAFFS_FAIL;
4034 }
4035 } else if (yaffs_is_non_empty_dir(obj)) {
4036 return YAFFS_FAIL;
4037 } else {
4038 return yaffs_change_obj_name(obj, obj->my_dev->unlinked_dir,
4039 _Y("unlinked"), 0, 0);
4040 }
4041}
William Juulc051bbe2007-11-15 11:13:05 +01004042
Charles Manning3796e1f2012-05-09 16:55:17 +00004043static int yaffs_unlink_obj(struct yaffs_obj *obj)
4044{
4045 if (obj && obj->unlink_allowed)
4046 return yaffs_unlink_worker(obj);
William Juulc051bbe2007-11-15 11:13:05 +01004047
Charles Manning3796e1f2012-05-09 16:55:17 +00004048 return YAFFS_FAIL;
4049}
William Juulc051bbe2007-11-15 11:13:05 +01004050
Charles Manning3796e1f2012-05-09 16:55:17 +00004051int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR *name)
4052{
4053 struct yaffs_obj *obj;
William Juulc051bbe2007-11-15 11:13:05 +01004054
Charles Manning3796e1f2012-05-09 16:55:17 +00004055 obj = yaffs_find_by_name(dir, name);
4056 return yaffs_unlink_obj(obj);
4057}
William Juulc051bbe2007-11-15 11:13:05 +01004058
Charles Manning3796e1f2012-05-09 16:55:17 +00004059/* Note:
4060 * If old_name is NULL then we take old_dir as the object to be renamed.
4061 */
4062int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR *old_name,
4063 struct yaffs_obj *new_dir, const YCHAR *new_name)
4064{
4065 struct yaffs_obj *obj = NULL;
4066 struct yaffs_obj *existing_target = NULL;
4067 int force = 0;
4068 int result;
4069 struct yaffs_dev *dev;
William Juulc051bbe2007-11-15 11:13:05 +01004070
Charles Manning3796e1f2012-05-09 16:55:17 +00004071 if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4072 BUG();
4073 return YAFFS_FAIL;
4074 }
4075 if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4076 BUG();
4077 return YAFFS_FAIL;
4078 }
William Juulc051bbe2007-11-15 11:13:05 +01004079
Charles Manning3796e1f2012-05-09 16:55:17 +00004080 dev = old_dir->my_dev;
William Juulc051bbe2007-11-15 11:13:05 +01004081
Charles Manning3796e1f2012-05-09 16:55:17 +00004082#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
4083 /* Special case for case insemsitive systems.
4084 * While look-up is case insensitive, the name isn't.
4085 * Therefore we might want to change x.txt to X.txt
4086 */
4087 if (old_dir == new_dir &&
4088 old_name && new_name &&
4089 yaffs_strcmp(old_name, new_name) == 0)
4090 force = 1;
4091#endif
William Juulc051bbe2007-11-15 11:13:05 +01004092
Charles Manning3796e1f2012-05-09 16:55:17 +00004093 if (yaffs_strnlen(new_name, YAFFS_MAX_NAME_LENGTH + 1) >
4094 YAFFS_MAX_NAME_LENGTH)
4095 /* ENAMETOOLONG */
4096 return YAFFS_FAIL;
William Juulc051bbe2007-11-15 11:13:05 +01004097
Charles Manning3796e1f2012-05-09 16:55:17 +00004098 if (old_name)
4099 obj = yaffs_find_by_name(old_dir, old_name);
4100 else{
4101 obj = old_dir;
4102 old_dir = obj->parent;
4103 }
William Juulc051bbe2007-11-15 11:13:05 +01004104
Charles Manning3796e1f2012-05-09 16:55:17 +00004105 if (obj && obj->rename_allowed) {
4106 /* Now handle an existing target, if there is one */
4107 existing_target = yaffs_find_by_name(new_dir, new_name);
4108 if (yaffs_is_non_empty_dir(existing_target)) {
4109 return YAFFS_FAIL; /* ENOTEMPTY */
4110 } else if (existing_target && existing_target != obj) {
4111 /* Nuke the target first, using shadowing,
4112 * but only if it isn't the same object.
4113 *
4114 * Note we must disable gc here otherwise it can mess
4115 * up the shadowing.
4116 *
4117 */
4118 dev->gc_disable = 1;
4119 yaffs_change_obj_name(obj, new_dir, new_name, force,
4120 existing_target->obj_id);
4121 existing_target->is_shadowed = 1;
4122 yaffs_unlink_obj(existing_target);
4123 dev->gc_disable = 0;
4124 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004125
Charles Manning3796e1f2012-05-09 16:55:17 +00004126 result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0);
William Juulc051bbe2007-11-15 11:13:05 +01004127
Charles Manning3796e1f2012-05-09 16:55:17 +00004128 yaffs_update_parent(old_dir);
4129 if (new_dir != old_dir)
4130 yaffs_update_parent(new_dir);
William Juulc051bbe2007-11-15 11:13:05 +01004131
Charles Manning3796e1f2012-05-09 16:55:17 +00004132 return result;
4133 }
4134 return YAFFS_FAIL;
4135}
William Juulc051bbe2007-11-15 11:13:05 +01004136
Charles Manning3796e1f2012-05-09 16:55:17 +00004137/*----------------------- Initialisation Scanning ---------------------- */
William Juulc051bbe2007-11-15 11:13:05 +01004138
Charles Manning3796e1f2012-05-09 16:55:17 +00004139void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
4140 int backward_scanning)
4141{
4142 struct yaffs_obj *obj;
William Juulc051bbe2007-11-15 11:13:05 +01004143
Charles Manning3796e1f2012-05-09 16:55:17 +00004144 if (backward_scanning) {
4145 /* Handle YAFFS2 case (backward scanning)
4146 * If the shadowed object exists then ignore.
4147 */
4148 obj = yaffs_find_by_number(dev, obj_id);
4149 if (obj)
4150 return;
William Juulc051bbe2007-11-15 11:13:05 +01004151 }
4152
Charles Manning3796e1f2012-05-09 16:55:17 +00004153 /* Let's create it (if it does not exist) assuming it is a file so that
4154 * it can do shrinking etc.
4155 * We put it in unlinked dir to be cleaned up after the scanning
William Juulc051bbe2007-11-15 11:13:05 +01004156 */
Charles Manning3796e1f2012-05-09 16:55:17 +00004157 obj =
4158 yaffs_find_or_create_by_number(dev, obj_id, YAFFS_OBJECT_TYPE_FILE);
4159 if (!obj)
4160 return;
4161 obj->is_shadowed = 1;
4162 yaffs_add_obj_to_dir(dev->unlinked_dir, obj);
4163 obj->variant.file_variant.shrink_size = 0;
4164 obj->valid = 1; /* So that we don't read any other info. */
4165}
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004166
Charles Manning3796e1f2012-05-09 16:55:17 +00004167void yaffs_link_fixup(struct yaffs_dev *dev, struct list_head *hard_list)
4168{
4169 struct list_head *lh;
4170 struct list_head *save;
4171 struct yaffs_obj *hl;
4172 struct yaffs_obj *in;
William Juulc051bbe2007-11-15 11:13:05 +01004173
Charles Manning3796e1f2012-05-09 16:55:17 +00004174 list_for_each_safe(lh, save, hard_list) {
4175 hl = list_entry(lh, struct yaffs_obj, hard_links);
4176 in = yaffs_find_by_number(dev,
4177 hl->variant.hardlink_variant.equiv_id);
William Juulc051bbe2007-11-15 11:13:05 +01004178
Charles Manning3796e1f2012-05-09 16:55:17 +00004179 if (in) {
4180 /* Add the hardlink pointers */
4181 hl->variant.hardlink_variant.equiv_obj = in;
4182 list_add(&hl->hard_links, &in->hard_links);
4183 } else {
4184 /* Todo Need to report/handle this better.
4185 * Got a problem... hardlink to a non-existant object
4186 */
4187 hl->variant.hardlink_variant.equiv_obj = NULL;
4188 INIT_LIST_HEAD(&hl->hard_links);
William Juulc051bbe2007-11-15 11:13:05 +01004189 }
Charles Manning3796e1f2012-05-09 16:55:17 +00004190 }
4191}
William Juulc051bbe2007-11-15 11:13:05 +01004192
Charles Manning3796e1f2012-05-09 16:55:17 +00004193static void yaffs_strip_deleted_objs(struct yaffs_dev *dev)
4194{
4195 /*
4196 * Sort out state of unlinked and deleted objects after scanning.
4197 */
4198 struct list_head *i;
4199 struct list_head *n;
4200 struct yaffs_obj *l;
William Juulc051bbe2007-11-15 11:13:05 +01004201
Charles Manning3796e1f2012-05-09 16:55:17 +00004202 if (dev->read_only)
4203 return;
William Juulc051bbe2007-11-15 11:13:05 +01004204
Charles Manning3796e1f2012-05-09 16:55:17 +00004205 /* Soft delete all the unlinked files */
4206 list_for_each_safe(i, n,
4207 &dev->unlinked_dir->variant.dir_variant.children) {
4208 l = list_entry(i, struct yaffs_obj, siblings);
4209 yaffs_del_obj(l);
4210 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004211
Charles Manning3796e1f2012-05-09 16:55:17 +00004212 list_for_each_safe(i, n, &dev->del_dir->variant.dir_variant.children) {
4213 l = list_entry(i, struct yaffs_obj, siblings);
4214 yaffs_del_obj(l);
William Juulc051bbe2007-11-15 11:13:05 +01004215 }
Charles Manning3796e1f2012-05-09 16:55:17 +00004216}
William Juulc051bbe2007-11-15 11:13:05 +01004217
Charles Manning3796e1f2012-05-09 16:55:17 +00004218/*
4219 * This code iterates through all the objects making sure that they are rooted.
4220 * Any unrooted objects are re-rooted in lost+found.
4221 * An object needs to be in one of:
4222 * - Directly under deleted, unlinked
4223 * - Directly or indirectly under root.
4224 *
4225 * Note:
4226 * This code assumes that we don't ever change the current relationships
4227 * between directories:
4228 * root_dir->parent == unlinked_dir->parent == del_dir->parent == NULL
4229 * lost-n-found->parent == root_dir
4230 *
4231 * This fixes the problem where directories might have inadvertently been
4232 * deleted leaving the object "hanging" without being rooted in the
4233 * directory tree.
4234 */
William Juulc051bbe2007-11-15 11:13:05 +01004235
Charles Manning3796e1f2012-05-09 16:55:17 +00004236static int yaffs_has_null_parent(struct yaffs_dev *dev, struct yaffs_obj *obj)
4237{
4238 return (obj == dev->del_dir ||
4239 obj == dev->unlinked_dir || obj == dev->root_dir);
William Juulc051bbe2007-11-15 11:13:05 +01004240}
4241
Charles Manning3796e1f2012-05-09 16:55:17 +00004242static void yaffs_fix_hanging_objs(struct yaffs_dev *dev)
William Juulc051bbe2007-11-15 11:13:05 +01004243{
Charles Manning3796e1f2012-05-09 16:55:17 +00004244 struct yaffs_obj *obj;
4245 struct yaffs_obj *parent;
4246 int i;
4247 struct list_head *lh;
4248 struct list_head *n;
4249 int depth_limit;
4250 int hanging;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004251
Charles Manning3796e1f2012-05-09 16:55:17 +00004252 if (dev->read_only)
4253 return;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004254
Charles Manning3796e1f2012-05-09 16:55:17 +00004255 /* Iterate through the objects in each hash entry,
4256 * looking at each object.
4257 * Make sure it is rooted.
4258 */
William Juulc051bbe2007-11-15 11:13:05 +01004259
Charles Manning3796e1f2012-05-09 16:55:17 +00004260 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
4261 list_for_each_safe(lh, n, &dev->obj_bucket[i].list) {
4262 obj = list_entry(lh, struct yaffs_obj, hash_link);
4263 parent = obj->parent;
William Juulc051bbe2007-11-15 11:13:05 +01004264
Charles Manning3796e1f2012-05-09 16:55:17 +00004265 if (yaffs_has_null_parent(dev, obj)) {
4266 /* These directories are not hanging */
4267 hanging = 0;
4268 } else if (!parent ||
4269 parent->variant_type !=
4270 YAFFS_OBJECT_TYPE_DIRECTORY) {
4271 hanging = 1;
4272 } else if (yaffs_has_null_parent(dev, parent)) {
4273 hanging = 0;
4274 } else {
4275 /*
4276 * Need to follow the parent chain to
4277 * see if it is hanging.
4278 */
4279 hanging = 0;
4280 depth_limit = 100;
William Juulc051bbe2007-11-15 11:13:05 +01004281
Charles Manning3796e1f2012-05-09 16:55:17 +00004282 while (parent != dev->root_dir &&
4283 parent->parent &&
4284 parent->parent->variant_type ==
4285 YAFFS_OBJECT_TYPE_DIRECTORY &&
4286 depth_limit > 0) {
4287 parent = parent->parent;
4288 depth_limit--;
4289 }
4290 if (parent != dev->root_dir)
4291 hanging = 1;
4292 }
4293 if (hanging) {
4294 yaffs_trace(YAFFS_TRACE_SCAN,
4295 "Hanging object %d moved to lost and found",
4296 obj->obj_id);
4297 yaffs_add_obj_to_dir(dev->lost_n_found, obj);
4298 }
4299 }
William Juulc051bbe2007-11-15 11:13:05 +01004300 }
Charles Manning3796e1f2012-05-09 16:55:17 +00004301}
William Juulc051bbe2007-11-15 11:13:05 +01004302
Charles Manning3796e1f2012-05-09 16:55:17 +00004303/*
4304 * Delete directory contents for cleaning up lost and found.
4305 */
4306static void yaffs_del_dir_contents(struct yaffs_obj *dir)
4307{
4308 struct yaffs_obj *obj;
4309 struct list_head *lh;
4310 struct list_head *n;
William Juulc051bbe2007-11-15 11:13:05 +01004311
Charles Manning3796e1f2012-05-09 16:55:17 +00004312 if (dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
4313 BUG();
William Juulc051bbe2007-11-15 11:13:05 +01004314
Charles Manning3796e1f2012-05-09 16:55:17 +00004315 list_for_each_safe(lh, n, &dir->variant.dir_variant.children) {
4316 obj = list_entry(lh, struct yaffs_obj, siblings);
4317 if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
4318 yaffs_del_dir_contents(obj);
4319 yaffs_trace(YAFFS_TRACE_SCAN,
4320 "Deleting lost_found object %d",
4321 obj->obj_id);
4322 yaffs_unlink_obj(obj);
William Juulc051bbe2007-11-15 11:13:05 +01004323 }
4324}
4325
Charles Manning3796e1f2012-05-09 16:55:17 +00004326static void yaffs_empty_l_n_f(struct yaffs_dev *dev)
William Juulc051bbe2007-11-15 11:13:05 +01004327{
Charles Manning3796e1f2012-05-09 16:55:17 +00004328 yaffs_del_dir_contents(dev->lost_n_found);
4329}
4330
William Juulc051bbe2007-11-15 11:13:05 +01004331
Charles Manning3796e1f2012-05-09 16:55:17 +00004332struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *directory,
4333 const YCHAR *name)
4334{
4335 int sum;
William Juulc051bbe2007-11-15 11:13:05 +01004336 struct list_head *i;
4337 YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
Charles Manning3796e1f2012-05-09 16:55:17 +00004338 struct yaffs_obj *l;
William Juulc051bbe2007-11-15 11:13:05 +01004339
Charles Manning3796e1f2012-05-09 16:55:17 +00004340 if (!name)
William Juulc051bbe2007-11-15 11:13:05 +01004341 return NULL;
William Juulc051bbe2007-11-15 11:13:05 +01004342
4343 if (!directory) {
Charles Manning3796e1f2012-05-09 16:55:17 +00004344 yaffs_trace(YAFFS_TRACE_ALWAYS,
4345 "tragedy: yaffs_find_by_name: null pointer directory"
4346 );
4347 BUG();
4348 return NULL;
William Juulc051bbe2007-11-15 11:13:05 +01004349 }
Charles Manning3796e1f2012-05-09 16:55:17 +00004350 if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4351 yaffs_trace(YAFFS_TRACE_ALWAYS,
4352 "tragedy: yaffs_find_by_name: non-directory"
4353 );
4354 BUG();
William Juulc051bbe2007-11-15 11:13:05 +01004355 }
4356
Charles Manning3796e1f2012-05-09 16:55:17 +00004357 sum = yaffs_calc_name_sum(name);
William Juulc051bbe2007-11-15 11:13:05 +01004358
Charles Manning3796e1f2012-05-09 16:55:17 +00004359 list_for_each(i, &directory->variant.dir_variant.children) {
4360 l = list_entry(i, struct yaffs_obj, siblings);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004361
Charles Manning3796e1f2012-05-09 16:55:17 +00004362 if (l->parent != directory)
4363 BUG();
William Juulc051bbe2007-11-15 11:13:05 +01004364
Charles Manning3796e1f2012-05-09 16:55:17 +00004365 yaffs_check_obj_details_loaded(l);
William Juulc051bbe2007-11-15 11:13:05 +01004366
Charles Manning3796e1f2012-05-09 16:55:17 +00004367 /* Special case for lost-n-found */
4368 if (l->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
4369 if (!yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME))
4370 return l;
4371 } else if (l->sum == sum || l->hdr_chunk <= 0) {
4372 /* LostnFound chunk called Objxxx
4373 * Do a real check
4374 */
4375 yaffs_get_obj_name(l, buffer,
4376 YAFFS_MAX_NAME_LENGTH + 1);
4377 if (!yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH))
4378 return l;
William Juulc051bbe2007-11-15 11:13:05 +01004379 }
4380 }
William Juulc051bbe2007-11-15 11:13:05 +01004381 return NULL;
4382}
William Juulc051bbe2007-11-15 11:13:05 +01004383
4384/* GetEquivalentObject dereferences any hard links to get to the
4385 * actual object.
4386 */
4387
Charles Manning3796e1f2012-05-09 16:55:17 +00004388struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj)
William Juulc051bbe2007-11-15 11:13:05 +01004389{
Charles Manning3796e1f2012-05-09 16:55:17 +00004390 if (obj && obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
4391 obj = obj->variant.hardlink_variant.equiv_obj;
4392 yaffs_check_obj_details_loaded(obj);
William Juulc051bbe2007-11-15 11:13:05 +01004393 }
4394 return obj;
William Juulc051bbe2007-11-15 11:13:05 +01004395}
4396
Charles Manning3796e1f2012-05-09 16:55:17 +00004397/*
4398 * A note or two on object names.
4399 * * If the object name is missing, we then make one up in the form objnnn
4400 *
4401 * * ASCII names are stored in the object header's name field from byte zero
4402 * * Unicode names are historically stored starting from byte zero.
4403 *
4404 * Then there are automatic Unicode names...
4405 * The purpose of these is to save names in a way that can be read as
4406 * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII
4407 * system to share files.
4408 *
4409 * These automatic unicode are stored slightly differently...
4410 * - If the name can fit in the ASCII character space then they are saved as
4411 * ascii names as per above.
4412 * - If the name needs Unicode then the name is saved in Unicode
4413 * starting at oh->name[1].
William Juulc051bbe2007-11-15 11:13:05 +01004414
Charles Manning3796e1f2012-05-09 16:55:17 +00004415 */
4416static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR *name,
4417 int buffer_size)
4418{
4419 /* Create an object name if we could not find one. */
4420 if (yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH) == 0) {
4421 YCHAR local_name[20];
4422 YCHAR num_string[20];
4423 YCHAR *x = &num_string[19];
4424 unsigned v = obj->obj_id;
4425 num_string[19] = 0;
4426 while (v > 0) {
4427 x--;
4428 *x = '0' + (v % 10);
4429 v /= 10;
4430 }
William Juulc051bbe2007-11-15 11:13:05 +01004431 /* make up a name */
Charles Manning3796e1f2012-05-09 16:55:17 +00004432 yaffs_strcpy(local_name, YAFFS_LOSTNFOUND_PREFIX);
4433 yaffs_strcat(local_name, x);
4434 yaffs_strncpy(name, local_name, buffer_size - 1);
William Juulc051bbe2007-11-15 11:13:05 +01004435 }
Charles Manning3796e1f2012-05-09 16:55:17 +00004436}
William Juulc051bbe2007-11-15 11:13:05 +01004437
Charles Manning3796e1f2012-05-09 16:55:17 +00004438int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR *name, int buffer_size)
4439{
4440 memset(name, 0, buffer_size * sizeof(YCHAR));
4441 yaffs_check_obj_details_loaded(obj);
4442 if (obj->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
4443 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1);
4444 } else if (obj->short_name[0]) {
4445 yaffs_strcpy(name, obj->short_name);
4446 } else if (obj->hdr_chunk > 0) {
4447 int result;
4448 u8 *buffer = yaffs_get_temp_buffer(obj->my_dev);
4449
4450 struct yaffs_obj_hdr *oh = (struct yaffs_obj_hdr *)buffer;
William Juulc051bbe2007-11-15 11:13:05 +01004451
Charles Manning3796e1f2012-05-09 16:55:17 +00004452 memset(buffer, 0, obj->my_dev->data_bytes_per_chunk);
William Juulc051bbe2007-11-15 11:13:05 +01004453
Charles Manning3796e1f2012-05-09 16:55:17 +00004454 if (obj->hdr_chunk > 0) {
4455 result = yaffs_rd_chunk_tags_nand(obj->my_dev,
4456 obj->hdr_chunk,
4457 buffer, NULL);
William Juulc051bbe2007-11-15 11:13:05 +01004458 }
Charles Manning3796e1f2012-05-09 16:55:17 +00004459 yaffs_load_name_from_oh(obj->my_dev, name, oh->name,
4460 buffer_size);
William Juulc051bbe2007-11-15 11:13:05 +01004461
Charles Manning3796e1f2012-05-09 16:55:17 +00004462 yaffs_release_temp_buffer(obj->my_dev, buffer);
William Juulc051bbe2007-11-15 11:13:05 +01004463 }
4464
Charles Manning3796e1f2012-05-09 16:55:17 +00004465 yaffs_fix_null_name(obj, name, buffer_size);
4466
4467 return yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH);
William Juulc051bbe2007-11-15 11:13:05 +01004468}
4469
Charles Manning3796e1f2012-05-09 16:55:17 +00004470loff_t yaffs_get_obj_length(struct yaffs_obj *obj)
William Juulc051bbe2007-11-15 11:13:05 +01004471{
William Juulc051bbe2007-11-15 11:13:05 +01004472 /* Dereference any hard linking */
Charles Manning3796e1f2012-05-09 16:55:17 +00004473 obj = yaffs_get_equivalent_obj(obj);
William Juulc051bbe2007-11-15 11:13:05 +01004474
Charles Manning3796e1f2012-05-09 16:55:17 +00004475 if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
4476 return obj->variant.file_variant.file_size;
4477 if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
4478 if (!obj->variant.symlink_variant.alias)
4479 return 0;
4480 return yaffs_strnlen(obj->variant.symlink_variant.alias,
4481 YAFFS_MAX_ALIAS_LENGTH);
William Juulc051bbe2007-11-15 11:13:05 +01004482 } else {
4483 /* Only a directory should drop through to here */
Charles Manning3796e1f2012-05-09 16:55:17 +00004484 return obj->my_dev->data_bytes_per_chunk;
William Juulc051bbe2007-11-15 11:13:05 +01004485 }
4486}
4487
Charles Manning3796e1f2012-05-09 16:55:17 +00004488int yaffs_get_obj_link_count(struct yaffs_obj *obj)
William Juulc051bbe2007-11-15 11:13:05 +01004489{
4490 int count = 0;
4491 struct list_head *i;
4492
Charles Manning3796e1f2012-05-09 16:55:17 +00004493 if (!obj->unlinked)
William Juulc051bbe2007-11-15 11:13:05 +01004494 count++; /* the object itself */
Charles Manning3796e1f2012-05-09 16:55:17 +00004495
4496 list_for_each(i, &obj->hard_links)
4497 count++; /* add the hard links; */
William Juulc051bbe2007-11-15 11:13:05 +01004498
Charles Manning3796e1f2012-05-09 16:55:17 +00004499 return count;
William Juulc051bbe2007-11-15 11:13:05 +01004500}
4501
Charles Manning3796e1f2012-05-09 16:55:17 +00004502int yaffs_get_obj_inode(struct yaffs_obj *obj)
William Juulc051bbe2007-11-15 11:13:05 +01004503{
Charles Manning3796e1f2012-05-09 16:55:17 +00004504 obj = yaffs_get_equivalent_obj(obj);
William Juulc051bbe2007-11-15 11:13:05 +01004505
Charles Manning3796e1f2012-05-09 16:55:17 +00004506 return obj->obj_id;
William Juulc051bbe2007-11-15 11:13:05 +01004507}
4508
Charles Manning3796e1f2012-05-09 16:55:17 +00004509unsigned yaffs_get_obj_type(struct yaffs_obj *obj)
William Juulc051bbe2007-11-15 11:13:05 +01004510{
Charles Manning3796e1f2012-05-09 16:55:17 +00004511 obj = yaffs_get_equivalent_obj(obj);
William Juulc051bbe2007-11-15 11:13:05 +01004512
Charles Manning3796e1f2012-05-09 16:55:17 +00004513 switch (obj->variant_type) {
William Juulc051bbe2007-11-15 11:13:05 +01004514 case YAFFS_OBJECT_TYPE_FILE:
4515 return DT_REG;
4516 break;
4517 case YAFFS_OBJECT_TYPE_DIRECTORY:
4518 return DT_DIR;
4519 break;
4520 case YAFFS_OBJECT_TYPE_SYMLINK:
4521 return DT_LNK;
4522 break;
4523 case YAFFS_OBJECT_TYPE_HARDLINK:
4524 return DT_REG;
4525 break;
4526 case YAFFS_OBJECT_TYPE_SPECIAL:
4527 if (S_ISFIFO(obj->yst_mode))
4528 return DT_FIFO;
4529 if (S_ISCHR(obj->yst_mode))
4530 return DT_CHR;
4531 if (S_ISBLK(obj->yst_mode))
4532 return DT_BLK;
4533 if (S_ISSOCK(obj->yst_mode))
4534 return DT_SOCK;
Charles Manning3796e1f2012-05-09 16:55:17 +00004535 return DT_REG;
4536 break;
William Juulc051bbe2007-11-15 11:13:05 +01004537 default:
4538 return DT_REG;
4539 break;
4540 }
4541}
4542
Charles Manning3796e1f2012-05-09 16:55:17 +00004543YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj)
William Juulc051bbe2007-11-15 11:13:05 +01004544{
Charles Manning3796e1f2012-05-09 16:55:17 +00004545 obj = yaffs_get_equivalent_obj(obj);
4546 if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
4547 return yaffs_clone_str(obj->variant.symlink_variant.alias);
4548 else
4549 return yaffs_clone_str(_Y(""));
William Juulc051bbe2007-11-15 11:13:05 +01004550}
William Juulc051bbe2007-11-15 11:13:05 +01004551
Charles Manning3796e1f2012-05-09 16:55:17 +00004552/*--------------------------- Initialisation code -------------------------- */
William Juulc051bbe2007-11-15 11:13:05 +01004553
Charles Manning3796e1f2012-05-09 16:55:17 +00004554static int yaffs_check_dev_fns(const struct yaffs_dev *dev)
William Juulc051bbe2007-11-15 11:13:05 +01004555{
William Juulc051bbe2007-11-15 11:13:05 +01004556 /* Common functions, gotta have */
Charles Manning3796e1f2012-05-09 16:55:17 +00004557 if (!dev->param.erase_fn || !dev->param.initialise_flash_fn)
William Juulc051bbe2007-11-15 11:13:05 +01004558 return 0;
4559
William Juulc051bbe2007-11-15 11:13:05 +01004560 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
Charles Manning3796e1f2012-05-09 16:55:17 +00004561 if (dev->param.write_chunk_tags_fn &&
4562 dev->param.read_chunk_tags_fn &&
4563 !dev->param.write_chunk_fn &&
4564 !dev->param.read_chunk_fn &&
4565 dev->param.bad_block_fn && dev->param.query_block_fn)
William Juulc051bbe2007-11-15 11:13:05 +01004566 return 1;
William Juulc051bbe2007-11-15 11:13:05 +01004567
4568 /* Can use the "spare" style interface for yaffs1 */
Charles Manning3796e1f2012-05-09 16:55:17 +00004569 if (!dev->param.is_yaffs2 &&
4570 !dev->param.write_chunk_tags_fn &&
4571 !dev->param.read_chunk_tags_fn &&
4572 dev->param.write_chunk_fn &&
4573 dev->param.read_chunk_fn &&
4574 !dev->param.bad_block_fn && !dev->param.query_block_fn)
William Juulc051bbe2007-11-15 11:13:05 +01004575 return 1;
4576
4577 return 0; /* bad */
4578}
4579
Charles Manning3796e1f2012-05-09 16:55:17 +00004580static int yaffs_create_initial_dir(struct yaffs_dev *dev)
William Juulc051bbe2007-11-15 11:13:05 +01004581{
Charles Manning3796e1f2012-05-09 16:55:17 +00004582 /* Initialise the unlinked, deleted, root and lost+found directories */
4583 dev->lost_n_found = dev->root_dir = NULL;
4584 dev->unlinked_dir = dev->del_dir = NULL;
4585 dev->unlinked_dir =
4586 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
4587 dev->del_dir =
4588 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
4589 dev->root_dir =
4590 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_ROOT,
4591 YAFFS_ROOT_MODE | S_IFDIR);
4592 dev->lost_n_found =
4593 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_LOSTNFOUND,
4594 YAFFS_LOSTNFOUND_MODE | S_IFDIR);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004595
Charles Manning3796e1f2012-05-09 16:55:17 +00004596 if (dev->lost_n_found && dev->root_dir && dev->unlinked_dir
4597 && dev->del_dir) {
4598 yaffs_add_obj_to_dir(dev->root_dir, dev->lost_n_found);
William Juulc051bbe2007-11-15 11:13:05 +01004599 return YAFFS_OK;
4600 }
William Juulc051bbe2007-11-15 11:13:05 +01004601 return YAFFS_FAIL;
4602}
4603
Charles Manning3796e1f2012-05-09 16:55:17 +00004604int yaffs_guts_initialise(struct yaffs_dev *dev)
William Juulc051bbe2007-11-15 11:13:05 +01004605{
4606 int init_failed = 0;
4607 unsigned x;
4608 int bits;
4609
Charles Manning3796e1f2012-05-09 16:55:17 +00004610 yaffs_trace(YAFFS_TRACE_TRACING, "yaffs: yaffs_guts_initialise()");
William Juulc051bbe2007-11-15 11:13:05 +01004611
4612 /* Check stuff that must be set */
4613
4614 if (!dev) {
Charles Manning3796e1f2012-05-09 16:55:17 +00004615 yaffs_trace(YAFFS_TRACE_ALWAYS,
4616 "yaffs: Need a device"
4617 );
4618 return YAFFS_FAIL;
4619 }
4620
4621 if (dev->is_mounted) {
4622 yaffs_trace(YAFFS_TRACE_ALWAYS, "device already mounted");
William Juulc051bbe2007-11-15 11:13:05 +01004623 return YAFFS_FAIL;
4624 }
4625
Charles Manning3796e1f2012-05-09 16:55:17 +00004626 dev->internal_start_block = dev->param.start_block;
4627 dev->internal_end_block = dev->param.end_block;
4628 dev->block_offset = 0;
4629 dev->chunk_offset = 0;
4630 dev->n_free_chunks = 0;
William Juulc051bbe2007-11-15 11:13:05 +01004631
Charles Manning3796e1f2012-05-09 16:55:17 +00004632 dev->gc_block = 0;
4633
4634 if (dev->param.start_block == 0) {
4635 dev->internal_start_block = dev->param.start_block + 1;
4636 dev->internal_end_block = dev->param.end_block + 1;
4637 dev->block_offset = 1;
4638 dev->chunk_offset = dev->param.chunks_per_block;
William Juulc051bbe2007-11-15 11:13:05 +01004639 }
4640
4641 /* Check geometry parameters. */
4642
Charles Manning3796e1f2012-05-09 16:55:17 +00004643 if ((!dev->param.inband_tags && dev->param.is_yaffs2 &&
4644 dev->param.total_bytes_per_chunk < 1024) ||
4645 (!dev->param.is_yaffs2 &&
4646 dev->param.total_bytes_per_chunk < 512) ||
4647 (dev->param.inband_tags && !dev->param.is_yaffs2) ||
4648 dev->param.chunks_per_block < 2 ||
4649 dev->param.n_reserved_blocks < 2 ||
4650 dev->internal_start_block <= 0 ||
4651 dev->internal_end_block <= 0 ||
4652 dev->internal_end_block <=
4653 (dev->internal_start_block + dev->param.n_reserved_blocks + 2)
4654 ) {
4655 /* otherwise it is too small */
4656 yaffs_trace(YAFFS_TRACE_ALWAYS,
4657 "NAND geometry problems: chunk size %d, type is yaffs%s, inband_tags %d ",
4658 dev->param.total_bytes_per_chunk,
4659 dev->param.is_yaffs2 ? "2" : "",
4660 dev->param.inband_tags);
William Juulc051bbe2007-11-15 11:13:05 +01004661 return YAFFS_FAIL;
4662 }
4663
Charles Manning3796e1f2012-05-09 16:55:17 +00004664 if (yaffs_init_nand(dev) != YAFFS_OK) {
4665 yaffs_trace(YAFFS_TRACE_ALWAYS, "InitialiseNAND failed");
William Juulc051bbe2007-11-15 11:13:05 +01004666 return YAFFS_FAIL;
4667 }
4668
Charles Manning3796e1f2012-05-09 16:55:17 +00004669 /* Sort out space for inband tags, if required */
4670 if (dev->param.inband_tags)
4671 dev->data_bytes_per_chunk =
4672 dev->param.total_bytes_per_chunk -
4673 sizeof(struct yaffs_packed_tags2_tags_only);
4674 else
4675 dev->data_bytes_per_chunk = dev->param.total_bytes_per_chunk;
4676
William Juulc051bbe2007-11-15 11:13:05 +01004677 /* Got the right mix of functions? */
Charles Manning3796e1f2012-05-09 16:55:17 +00004678 if (!yaffs_check_dev_fns(dev)) {
William Juulc051bbe2007-11-15 11:13:05 +01004679 /* Function missing */
Charles Manning3796e1f2012-05-09 16:55:17 +00004680 yaffs_trace(YAFFS_TRACE_ALWAYS,
4681 "device function(s) missing or wrong");
William Juulc051bbe2007-11-15 11:13:05 +01004682
William Juulc051bbe2007-11-15 11:13:05 +01004683 return YAFFS_FAIL;
4684 }
4685
Charles Manning3796e1f2012-05-09 16:55:17 +00004686 /* Finished with most checks. Further checks happen later on too. */
William Juulc051bbe2007-11-15 11:13:05 +01004687
Charles Manning3796e1f2012-05-09 16:55:17 +00004688 dev->is_mounted = 1;
William Juulc051bbe2007-11-15 11:13:05 +01004689
4690 /* OK now calculate a few things for the device */
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004691
William Juulc051bbe2007-11-15 11:13:05 +01004692 /*
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004693 * Calculate all the chunk size manipulation numbers:
William Juulc051bbe2007-11-15 11:13:05 +01004694 */
Charles Manning3796e1f2012-05-09 16:55:17 +00004695 x = dev->data_bytes_per_chunk;
4696 /* We always use dev->chunk_shift and dev->chunk_div */
4697 dev->chunk_shift = calc_shifts(x);
4698 x >>= dev->chunk_shift;
4699 dev->chunk_div = x;
4700 /* We only use chunk mask if chunk_div is 1 */
4701 dev->chunk_mask = (1 << dev->chunk_shift) - 1;
William Juulc051bbe2007-11-15 11:13:05 +01004702
4703 /*
Charles Manning3796e1f2012-05-09 16:55:17 +00004704 * Calculate chunk_grp_bits.
4705 * We need to find the next power of 2 > than internal_end_block
William Juulc051bbe2007-11-15 11:13:05 +01004706 */
4707
Charles Manning3796e1f2012-05-09 16:55:17 +00004708 x = dev->param.chunks_per_block * (dev->internal_end_block + 1);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004709
Charles Manning3796e1f2012-05-09 16:55:17 +00004710 bits = calc_shifts_ceiling(x);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004711
William Juulc051bbe2007-11-15 11:13:05 +01004712 /* Set up tnode width if wide tnodes are enabled. */
Charles Manning3796e1f2012-05-09 16:55:17 +00004713 if (!dev->param.wide_tnodes_disabled) {
William Juulc051bbe2007-11-15 11:13:05 +01004714 /* bits must be even so that we end up with 32-bit words */
Charles Manning3796e1f2012-05-09 16:55:17 +00004715 if (bits & 1)
William Juulc051bbe2007-11-15 11:13:05 +01004716 bits++;
Charles Manning3796e1f2012-05-09 16:55:17 +00004717 if (bits < 16)
4718 dev->tnode_width = 16;
William Juulc051bbe2007-11-15 11:13:05 +01004719 else
Charles Manning3796e1f2012-05-09 16:55:17 +00004720 dev->tnode_width = bits;
4721 } else {
4722 dev->tnode_width = 16;
William Juulc051bbe2007-11-15 11:13:05 +01004723 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004724
Charles Manning3796e1f2012-05-09 16:55:17 +00004725 dev->tnode_mask = (1 << dev->tnode_width) - 1;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004726
William Juulc051bbe2007-11-15 11:13:05 +01004727 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
4728 * so if the bitwidth of the
4729 * chunk range we're using is greater than 16 we need
Charles Manning3796e1f2012-05-09 16:55:17 +00004730 * to figure out chunk shift and chunk_grp_size
William Juulc051bbe2007-11-15 11:13:05 +01004731 */
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004732
Charles Manning3796e1f2012-05-09 16:55:17 +00004733 if (bits <= dev->tnode_width)
4734 dev->chunk_grp_bits = 0;
William Juulc051bbe2007-11-15 11:13:05 +01004735 else
Charles Manning3796e1f2012-05-09 16:55:17 +00004736 dev->chunk_grp_bits = bits - dev->tnode_width;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004737
Charles Manning3796e1f2012-05-09 16:55:17 +00004738 dev->tnode_size = (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8;
4739 if (dev->tnode_size < sizeof(struct yaffs_tnode))
4740 dev->tnode_size = sizeof(struct yaffs_tnode);
William Juulc051bbe2007-11-15 11:13:05 +01004741
Charles Manning3796e1f2012-05-09 16:55:17 +00004742 dev->chunk_grp_size = 1 << dev->chunk_grp_bits;
William Juulc051bbe2007-11-15 11:13:05 +01004743
Charles Manning3796e1f2012-05-09 16:55:17 +00004744 if (dev->param.chunks_per_block < dev->chunk_grp_size) {
William Juulc051bbe2007-11-15 11:13:05 +01004745 /* We have a problem because the soft delete won't work if
4746 * the chunk group size > chunks per block.
4747 * This can be remedied by using larger "virtual blocks".
4748 */
Charles Manning3796e1f2012-05-09 16:55:17 +00004749 yaffs_trace(YAFFS_TRACE_ALWAYS, "chunk group too large");
William Juulc051bbe2007-11-15 11:13:05 +01004750
4751 return YAFFS_FAIL;
4752 }
4753
Charles Manning3796e1f2012-05-09 16:55:17 +00004754 /* Finished verifying the device, continue with initialisation */
William Juulc051bbe2007-11-15 11:13:05 +01004755
4756 /* More device initialisation */
Charles Manning3796e1f2012-05-09 16:55:17 +00004757 dev->all_gcs = 0;
4758 dev->passive_gc_count = 0;
4759 dev->oldest_dirty_gc_count = 0;
4760 dev->bg_gcs = 0;
4761 dev->gc_block_finder = 0;
4762 dev->buffered_block = -1;
4763 dev->doing_buffered_block_rewrite = 0;
4764 dev->n_deleted_files = 0;
4765 dev->n_bg_deletions = 0;
4766 dev->n_unlinked_files = 0;
4767 dev->n_ecc_fixed = 0;
4768 dev->n_ecc_unfixed = 0;
4769 dev->n_tags_ecc_fixed = 0;
4770 dev->n_tags_ecc_unfixed = 0;
4771 dev->n_erase_failures = 0;
4772 dev->n_erased_blocks = 0;
4773 dev->gc_disable = 0;
4774 dev->has_pending_prioritised_gc = 1;
4775 /* Assume the worst for now, will get fixed on first GC */
4776 INIT_LIST_HEAD(&dev->dirty_dirs);
4777 dev->oldest_dirty_seq = 0;
4778 dev->oldest_dirty_block = 0;
William Juulc051bbe2007-11-15 11:13:05 +01004779
4780 /* Initialise temporary buffers and caches. */
Charles Manning3796e1f2012-05-09 16:55:17 +00004781 if (!yaffs_init_tmp_buffers(dev))
William Juulc051bbe2007-11-15 11:13:05 +01004782 init_failed = 1;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004783
Charles Manning3796e1f2012-05-09 16:55:17 +00004784 dev->cache = NULL;
4785 dev->gc_cleanup_list = NULL;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004786
Charles Manning3796e1f2012-05-09 16:55:17 +00004787 if (!init_failed && dev->param.n_caches > 0) {
William Juulc051bbe2007-11-15 11:13:05 +01004788 int i;
Charles Manning3796e1f2012-05-09 16:55:17 +00004789 void *buf;
4790 int cache_bytes =
4791 dev->param.n_caches * sizeof(struct yaffs_cache);
William Juulc051bbe2007-11-15 11:13:05 +01004792
Charles Manning3796e1f2012-05-09 16:55:17 +00004793 if (dev->param.n_caches > YAFFS_MAX_SHORT_OP_CACHES)
4794 dev->param.n_caches = YAFFS_MAX_SHORT_OP_CACHES;
William Juulc051bbe2007-11-15 11:13:05 +01004795
Charles Manning3796e1f2012-05-09 16:55:17 +00004796 dev->cache = kmalloc(cache_bytes, GFP_NOFS);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004797
Charles Manning3796e1f2012-05-09 16:55:17 +00004798 buf = (u8 *) dev->cache;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004799
Charles Manning3796e1f2012-05-09 16:55:17 +00004800 if (dev->cache)
4801 memset(dev->cache, 0, cache_bytes);
4802
4803 for (i = 0; i < dev->param.n_caches && buf; i++) {
4804 dev->cache[i].object = NULL;
4805 dev->cache[i].last_use = 0;
4806 dev->cache[i].dirty = 0;
4807 dev->cache[i].data = buf =
4808 kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
William Juulc051bbe2007-11-15 11:13:05 +01004809 }
Charles Manning3796e1f2012-05-09 16:55:17 +00004810 if (!buf)
William Juulc051bbe2007-11-15 11:13:05 +01004811 init_failed = 1;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004812
Charles Manning3796e1f2012-05-09 16:55:17 +00004813 dev->cache_last_use = 0;
William Juulc051bbe2007-11-15 11:13:05 +01004814 }
4815
Charles Manning3796e1f2012-05-09 16:55:17 +00004816 dev->cache_hits = 0;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004817
Charles Manning3796e1f2012-05-09 16:55:17 +00004818 if (!init_failed) {
4819 dev->gc_cleanup_list =
4820 kmalloc(dev->param.chunks_per_block * sizeof(u32),
4821 GFP_NOFS);
4822 if (!dev->gc_cleanup_list)
William Juulc051bbe2007-11-15 11:13:05 +01004823 init_failed = 1;
4824 }
4825
Charles Manning3796e1f2012-05-09 16:55:17 +00004826 if (dev->param.is_yaffs2)
4827 dev->param.use_header_file_size = 1;
4828
4829 if (!init_failed && !yaffs_init_blocks(dev))
William Juulc051bbe2007-11-15 11:13:05 +01004830 init_failed = 1;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004831
Charles Manning3796e1f2012-05-09 16:55:17 +00004832 yaffs_init_tnodes_and_objs(dev);
William Juulc051bbe2007-11-15 11:13:05 +01004833
Charles Manning3796e1f2012-05-09 16:55:17 +00004834 if (!init_failed && !yaffs_create_initial_dir(dev))
William Juulc051bbe2007-11-15 11:13:05 +01004835 init_failed = 1;
4836
Charles Manning3796e1f2012-05-09 16:55:17 +00004837 if (!init_failed && dev->param.is_yaffs2 &&
4838 !dev->param.disable_summary &&
4839 !yaffs_summary_init(dev))
4840 init_failed = 1;
William Juulc051bbe2007-11-15 11:13:05 +01004841
Charles Manning3796e1f2012-05-09 16:55:17 +00004842 if (!init_failed) {
William Juulc051bbe2007-11-15 11:13:05 +01004843 /* Now scan the flash. */
Charles Manning3796e1f2012-05-09 16:55:17 +00004844 if (dev->param.is_yaffs2) {
4845 if (yaffs2_checkpt_restore(dev)) {
4846 yaffs_check_obj_details_loaded(dev->root_dir);
4847 yaffs_trace(YAFFS_TRACE_CHECKPOINT |
4848 YAFFS_TRACE_MOUNT,
4849 "yaffs: restored from checkpoint"
4850 );
William Juulc051bbe2007-11-15 11:13:05 +01004851 } else {
4852
Charles Manning3796e1f2012-05-09 16:55:17 +00004853 /* Clean up the mess caused by an aborted
4854 * checkpoint load then scan backwards.
William Juulc051bbe2007-11-15 11:13:05 +01004855 */
Charles Manning3796e1f2012-05-09 16:55:17 +00004856 yaffs_deinit_blocks(dev);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004857
Charles Manning3796e1f2012-05-09 16:55:17 +00004858 yaffs_deinit_tnodes_and_objs(dev);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004859
Charles Manning3796e1f2012-05-09 16:55:17 +00004860 dev->n_erased_blocks = 0;
4861 dev->n_free_chunks = 0;
4862 dev->alloc_block = -1;
4863 dev->alloc_page = -1;
4864 dev->n_deleted_files = 0;
4865 dev->n_unlinked_files = 0;
4866 dev->n_bg_deletions = 0;
William Juulc051bbe2007-11-15 11:13:05 +01004867
Charles Manning3796e1f2012-05-09 16:55:17 +00004868 if (!init_failed && !yaffs_init_blocks(dev))
William Juulc051bbe2007-11-15 11:13:05 +01004869 init_failed = 1;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004870
Charles Manning3796e1f2012-05-09 16:55:17 +00004871 yaffs_init_tnodes_and_objs(dev);
William Juulc051bbe2007-11-15 11:13:05 +01004872
Charles Manning3796e1f2012-05-09 16:55:17 +00004873 if (!init_failed
4874 && !yaffs_create_initial_dir(dev))
William Juulc051bbe2007-11-15 11:13:05 +01004875 init_failed = 1;
4876
Charles Manning3796e1f2012-05-09 16:55:17 +00004877 if (!init_failed && !yaffs2_scan_backwards(dev))
William Juulc051bbe2007-11-15 11:13:05 +01004878 init_failed = 1;
4879 }
Charles Manning3796e1f2012-05-09 16:55:17 +00004880 } else if (!yaffs1_scan(dev)) {
4881 init_failed = 1;
4882 }
4883
4884 yaffs_strip_deleted_objs(dev);
4885 yaffs_fix_hanging_objs(dev);
4886 if (dev->param.empty_lost_n_found)
4887 yaffs_empty_l_n_f(dev);
William Juulc051bbe2007-11-15 11:13:05 +01004888 }
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004889
Charles Manning3796e1f2012-05-09 16:55:17 +00004890 if (init_failed) {
William Juulc051bbe2007-11-15 11:13:05 +01004891 /* Clean up the mess */
Charles Manning3796e1f2012-05-09 16:55:17 +00004892 yaffs_trace(YAFFS_TRACE_TRACING,
4893 "yaffs: yaffs_guts_initialise() aborted.");
William Juulc051bbe2007-11-15 11:13:05 +01004894
Charles Manning3796e1f2012-05-09 16:55:17 +00004895 yaffs_deinitialise(dev);
William Juulc051bbe2007-11-15 11:13:05 +01004896 return YAFFS_FAIL;
4897 }
4898
4899 /* Zero out stats */
Charles Manning3796e1f2012-05-09 16:55:17 +00004900 dev->n_page_reads = 0;
4901 dev->n_page_writes = 0;
4902 dev->n_erasures = 0;
4903 dev->n_gc_copies = 0;
4904 dev->n_retried_writes = 0;
William Juulc051bbe2007-11-15 11:13:05 +01004905
Charles Manning3796e1f2012-05-09 16:55:17 +00004906 dev->n_retired_blocks = 0;
William Juulc051bbe2007-11-15 11:13:05 +01004907
Charles Manning3796e1f2012-05-09 16:55:17 +00004908 yaffs_verify_free_chunks(dev);
4909 yaffs_verify_blocks(dev);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004910
Charles Manning3796e1f2012-05-09 16:55:17 +00004911 /* Clean up any aborted checkpoint data */
4912 if (!dev->is_checkpointed && dev->blocks_in_checkpt > 0)
4913 yaffs2_checkpt_invalidate(dev);
William Juulc051bbe2007-11-15 11:13:05 +01004914
Charles Manning3796e1f2012-05-09 16:55:17 +00004915 yaffs_trace(YAFFS_TRACE_TRACING,
4916 "yaffs: yaffs_guts_initialise() done.");
William Juulc051bbe2007-11-15 11:13:05 +01004917 return YAFFS_OK;
William Juulc051bbe2007-11-15 11:13:05 +01004918}
4919
Charles Manning3796e1f2012-05-09 16:55:17 +00004920void yaffs_deinitialise(struct yaffs_dev *dev)
William Juulc051bbe2007-11-15 11:13:05 +01004921{
Charles Manning3796e1f2012-05-09 16:55:17 +00004922 if (dev->is_mounted) {
William Juulc051bbe2007-11-15 11:13:05 +01004923 int i;
4924
Charles Manning3796e1f2012-05-09 16:55:17 +00004925 yaffs_deinit_blocks(dev);
4926 yaffs_deinit_tnodes_and_objs(dev);
4927 yaffs_summary_deinit(dev);
William Juulc051bbe2007-11-15 11:13:05 +01004928
Charles Manning3796e1f2012-05-09 16:55:17 +00004929 if (dev->param.n_caches > 0 && dev->cache) {
4930
4931 for (i = 0; i < dev->param.n_caches; i++) {
4932 kfree(dev->cache[i].data);
4933 dev->cache[i].data = NULL;
William Juulc051bbe2007-11-15 11:13:05 +01004934 }
4935
Charles Manning3796e1f2012-05-09 16:55:17 +00004936 kfree(dev->cache);
4937 dev->cache = NULL;
William Juulc051bbe2007-11-15 11:13:05 +01004938 }
4939
Charles Manning3796e1f2012-05-09 16:55:17 +00004940 kfree(dev->gc_cleanup_list);
William Juulc051bbe2007-11-15 11:13:05 +01004941
Charles Manning3796e1f2012-05-09 16:55:17 +00004942 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
4943 kfree(dev->temp_buffer[i].buffer);
William Juulc051bbe2007-11-15 11:13:05 +01004944
Charles Manning3796e1f2012-05-09 16:55:17 +00004945 dev->is_mounted = 0;
William Juulc051bbe2007-11-15 11:13:05 +01004946
Charles Manning3796e1f2012-05-09 16:55:17 +00004947 if (dev->param.deinitialise_flash_fn)
4948 dev->param.deinitialise_flash_fn(dev);
4949 }
William Juulc051bbe2007-11-15 11:13:05 +01004950}
4951
Charles Manning3796e1f2012-05-09 16:55:17 +00004952int yaffs_count_free_chunks(struct yaffs_dev *dev)
William Juulc051bbe2007-11-15 11:13:05 +01004953{
Charles Manning3796e1f2012-05-09 16:55:17 +00004954 int n_free = 0;
William Juulc051bbe2007-11-15 11:13:05 +01004955 int b;
Charles Manning3796e1f2012-05-09 16:55:17 +00004956 struct yaffs_block_info *blk;
William Juulc051bbe2007-11-15 11:13:05 +01004957
Charles Manning3796e1f2012-05-09 16:55:17 +00004958 blk = dev->block_info;
4959 for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) {
4960 switch (blk->block_state) {
William Juulc051bbe2007-11-15 11:13:05 +01004961 case YAFFS_BLOCK_STATE_EMPTY:
4962 case YAFFS_BLOCK_STATE_ALLOCATING:
4963 case YAFFS_BLOCK_STATE_COLLECTING:
4964 case YAFFS_BLOCK_STATE_FULL:
Charles Manning3796e1f2012-05-09 16:55:17 +00004965 n_free +=
4966 (dev->param.chunks_per_block - blk->pages_in_use +
4967 blk->soft_del_pages);
William Juulc051bbe2007-11-15 11:13:05 +01004968 break;
4969 default:
4970 break;
4971 }
Charles Manning3796e1f2012-05-09 16:55:17 +00004972 blk++;
William Juulc051bbe2007-11-15 11:13:05 +01004973 }
Charles Manning3796e1f2012-05-09 16:55:17 +00004974 return n_free;
William Juulc051bbe2007-11-15 11:13:05 +01004975}
4976
Charles Manning3796e1f2012-05-09 16:55:17 +00004977int yaffs_get_n_free_chunks(struct yaffs_dev *dev)
William Juulc051bbe2007-11-15 11:13:05 +01004978{
4979 /* This is what we report to the outside world */
Charles Manning3796e1f2012-05-09 16:55:17 +00004980 int n_free;
4981 int n_dirty_caches;
4982 int blocks_for_checkpt;
4983 int i;
William Juulc051bbe2007-11-15 11:13:05 +01004984
Charles Manning3796e1f2012-05-09 16:55:17 +00004985 n_free = dev->n_free_chunks;
4986 n_free += dev->n_deleted_files;
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004987
Charles Manning3796e1f2012-05-09 16:55:17 +00004988 /* Now count and subtract the number of dirty chunks in the cache. */
William Juulc051bbe2007-11-15 11:13:05 +01004989
Charles Manning3796e1f2012-05-09 16:55:17 +00004990 for (n_dirty_caches = 0, i = 0; i < dev->param.n_caches; i++) {
4991 if (dev->cache[i].dirty)
4992 n_dirty_caches++;
William Juulc051bbe2007-11-15 11:13:05 +01004993 }
4994
Charles Manning3796e1f2012-05-09 16:55:17 +00004995 n_free -= n_dirty_caches;
William Juulc051bbe2007-11-15 11:13:05 +01004996
Charles Manning3796e1f2012-05-09 16:55:17 +00004997 n_free -=
4998 ((dev->param.n_reserved_blocks + 1) * dev->param.chunks_per_block);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02004999
Charles Manning3796e1f2012-05-09 16:55:17 +00005000 /* Now figure checkpoint space and report that... */
5001 blocks_for_checkpt = yaffs_calc_checkpt_blocks_required(dev);
Wolfgang Denk74e0dde2008-08-14 14:41:06 +02005002
Charles Manning3796e1f2012-05-09 16:55:17 +00005003 n_free -= (blocks_for_checkpt * dev->param.chunks_per_block);
William Juulc051bbe2007-11-15 11:13:05 +01005004
Charles Manning3796e1f2012-05-09 16:55:17 +00005005 if (n_free < 0)
5006 n_free = 0;
William Juulc051bbe2007-11-15 11:13:05 +01005007
Charles Manning3796e1f2012-05-09 16:55:17 +00005008 return n_free;
William Juulc051bbe2007-11-15 11:13:05 +01005009}
5010
Charles Manning3796e1f2012-05-09 16:55:17 +00005011/*\
5012 * Marshalling functions to get loff_t file sizes into aand out of
5013 * object headers.
5014 */
5015void yaffs_oh_size_load(struct yaffs_obj_hdr *oh, loff_t fsize)
William Juulc051bbe2007-11-15 11:13:05 +01005016{
Charles Manning3796e1f2012-05-09 16:55:17 +00005017 oh->file_size_low = (fsize & 0xFFFFFFFF);
5018 oh->file_size_high = ((fsize >> 32) & 0xFFFFFFFF);
William Juulc051bbe2007-11-15 11:13:05 +01005019}
5020
Charles Manning3796e1f2012-05-09 16:55:17 +00005021loff_t yaffs_oh_to_size(struct yaffs_obj_hdr *oh)
William Juulc051bbe2007-11-15 11:13:05 +01005022{
Charles Manning3796e1f2012-05-09 16:55:17 +00005023 loff_t retval;
5024
5025 if (~(oh->file_size_high))
5026 retval = (((loff_t) oh->file_size_high) << 32) |
5027 (((loff_t) oh->file_size_low) & 0xFFFFFFFF);
5028 else
5029 retval = (loff_t) oh->file_size_low;
William Juulc051bbe2007-11-15 11:13:05 +01005030
Charles Manning3796e1f2012-05-09 16:55:17 +00005031 return retval;
William Juulc051bbe2007-11-15 11:13:05 +01005032}