blob: 0bf52db0cef5c1ce0ecb271ab234e5cd5a174d03 [file] [log] [blame]
Stefan Roese2fc10f62009-03-19 15:35:05 +01001/*
2 * This file is part of UBIFS.
3 *
4 * Copyright (C) 2006-2008 Nokia Corporation.
5 *
Heiko Schocherf5895d12014-06-24 10:10:04 +02006 * SPDX-License-Identifier: GPL-2.0+
Stefan Roese2fc10f62009-03-19 15:35:05 +01007 *
8 * Authors: Artem Bityutskiy (Битюцкий Артём)
9 * Adrian Hunter
10 */
11
12/*
13 * This file implements UBIFS initialization and VFS superblock operations. Some
14 * initialization stuff which is rather large and complex is placed at
15 * corresponding subsystems, but most of it is here.
16 */
17
Heiko Schocherf5895d12014-06-24 10:10:04 +020018#ifndef __UBOOT__
19#include <linux/init.h>
20#include <linux/slab.h>
21#include <linux/module.h>
22#include <linux/ctype.h>
23#include <linux/kthread.h>
24#include <linux/parser.h>
25#include <linux/seq_file.h>
26#include <linux/mount.h>
Stefan Roese2fc10f62009-03-19 15:35:05 +010027#include <linux/math64.h>
Heiko Schocherf5895d12014-06-24 10:10:04 +020028#include <linux/writeback.h>
29#else
Stefan Roese2fc10f62009-03-19 15:35:05 +010030
Heiko Schocherf5895d12014-06-24 10:10:04 +020031#include <linux/compat.h>
32#include <linux/stat.h>
33#include <linux/err.h>
34#include "ubifs.h"
35#include <ubi_uboot.h>
36#include <mtd/ubi-user.h>
Stefan Roese2fc10f62009-03-19 15:35:05 +010037
Heiko Schocherf5895d12014-06-24 10:10:04 +020038struct dentry;
39struct file;
40struct iattr;
41struct kstat;
42struct vfsmount;
Stefan Roese2fc10f62009-03-19 15:35:05 +010043
Heiko Schocherf5895d12014-06-24 10:10:04 +020044#define INODE_LOCKED_MAX 64
Stefan Roese2fc10f62009-03-19 15:35:05 +010045
Heiko Schocherf5895d12014-06-24 10:10:04 +020046struct super_block *ubifs_sb;
47LIST_HEAD(super_blocks);
Stefan Roese2fc10f62009-03-19 15:35:05 +010048
Heiko Schocherf5895d12014-06-24 10:10:04 +020049static struct inode *inodes_locked_down[INODE_LOCKED_MAX];
Stefan Roese2fc10f62009-03-19 15:35:05 +010050
Heiko Schocherf5895d12014-06-24 10:10:04 +020051int set_anon_super(struct super_block *s, void *data)
Stefan Roese2fc10f62009-03-19 15:35:05 +010052{
Stefan Roese2fc10f62009-03-19 15:35:05 +010053 return 0;
54}
55
Stefan Roese2fc10f62009-03-19 15:35:05 +010056struct inode *iget_locked(struct super_block *sb, unsigned long ino)
57{
58 struct inode *inode;
59
Marcel Ziswilerabc574b2015-08-18 13:06:37 +020060 inode = (struct inode *)malloc_cache_aligned(
61 sizeof(struct ubifs_inode));
Stefan Roese2fc10f62009-03-19 15:35:05 +010062 if (inode) {
63 inode->i_ino = ino;
64 inode->i_sb = sb;
65 list_add(&inode->i_sb_list, &sb->s_inodes);
66 inode->i_state = I_LOCK | I_NEW;
67 }
68
69 return inode;
70}
71
Heiko Schocherf5895d12014-06-24 10:10:04 +020072void iget_failed(struct inode *inode)
73{
74}
75
Stefan Roese2fc10f62009-03-19 15:35:05 +010076int ubifs_iput(struct inode *inode)
77{
78 list_del_init(&inode->i_sb_list);
79
80 free(inode);
81 return 0;
82}
83
84/*
85 * Lock (save) inode in inode array for readback after recovery
86 */
87void iput(struct inode *inode)
88{
89 int i;
90 struct inode *ino;
91
92 /*
93 * Search end of list
94 */
95 for (i = 0; i < INODE_LOCKED_MAX; i++) {
96 if (inodes_locked_down[i] == NULL)
97 break;
98 }
99
100 if (i >= INODE_LOCKED_MAX) {
101 ubifs_err("Error, can't lock (save) more inodes while recovery!!!");
102 return;
103 }
104
105 /*
106 * Allocate and use new inode
107 */
Marcel Ziswilerabc574b2015-08-18 13:06:37 +0200108 ino = (struct inode *)malloc_cache_aligned(sizeof(struct ubifs_inode));
Stefan Roese2fc10f62009-03-19 15:35:05 +0100109 memcpy(ino, inode, sizeof(struct ubifs_inode));
110
111 /*
112 * Finally save inode in array
113 */
114 inodes_locked_down[i] = ino;
115}
116
Heiko Schocherf5895d12014-06-24 10:10:04 +0200117/* from fs/inode.c */
118/**
119 * clear_nlink - directly zero an inode's link count
120 * @inode: inode
121 *
122 * This is a low-level filesystem helper to replace any
123 * direct filesystem manipulation of i_nlink. See
124 * drop_nlink() for why we care about i_nlink hitting zero.
125 */
126void clear_nlink(struct inode *inode)
127{
128 if (inode->i_nlink) {
129 inode->__i_nlink = 0;
130 atomic_long_inc(&inode->i_sb->s_remove_count);
131 }
132}
133EXPORT_SYMBOL(clear_nlink);
134
135/**
136 * set_nlink - directly set an inode's link count
137 * @inode: inode
138 * @nlink: new nlink (should be non-zero)
139 *
140 * This is a low-level filesystem helper to replace any
141 * direct filesystem manipulation of i_nlink.
142 */
143void set_nlink(struct inode *inode, unsigned int nlink)
144{
145 if (!nlink) {
146 clear_nlink(inode);
147 } else {
148 /* Yes, some filesystems do change nlink from zero to one */
149 if (inode->i_nlink == 0)
150 atomic_long_dec(&inode->i_sb->s_remove_count);
151
152 inode->__i_nlink = nlink;
153 }
154}
155EXPORT_SYMBOL(set_nlink);
156
157/* from include/linux/fs.h */
158static inline void i_uid_write(struct inode *inode, uid_t uid)
159{
160 inode->i_uid.val = uid;
161}
162
163static inline void i_gid_write(struct inode *inode, gid_t gid)
164{
165 inode->i_gid.val = gid;
166}
167
168void unlock_new_inode(struct inode *inode)
169{
170 return;
171}
172#endif
173
174/*
175 * Maximum amount of memory we may 'kmalloc()' without worrying that we are
176 * allocating too much.
177 */
178#define UBIFS_KMALLOC_OK (128*1024)
179
180/* Slab cache for UBIFS inodes */
181struct kmem_cache *ubifs_inode_slab;
182
183#ifndef __UBOOT__
184/* UBIFS TNC shrinker description */
185static struct shrinker ubifs_shrinker_info = {
186 .scan_objects = ubifs_shrink_scan,
187 .count_objects = ubifs_shrink_count,
188 .seeks = DEFAULT_SEEKS,
189};
190#endif
191
192/**
193 * validate_inode - validate inode.
194 * @c: UBIFS file-system description object
195 * @inode: the inode to validate
196 *
197 * This is a helper function for 'ubifs_iget()' which validates various fields
198 * of a newly built inode to make sure they contain sane values and prevent
199 * possible vulnerabilities. Returns zero if the inode is all right and
200 * a non-zero error code if not.
201 */
202static int validate_inode(struct ubifs_info *c, const struct inode *inode)
203{
204 int err;
205 const struct ubifs_inode *ui = ubifs_inode(inode);
206
207 if (inode->i_size > c->max_inode_sz) {
208 ubifs_err("inode is too large (%lld)",
209 (long long)inode->i_size);
210 return 1;
211 }
212
213 if (ui->compr_type < 0 || ui->compr_type >= UBIFS_COMPR_TYPES_CNT) {
214 ubifs_err("unknown compression type %d", ui->compr_type);
215 return 2;
216 }
217
218 if (ui->xattr_names + ui->xattr_cnt > XATTR_LIST_MAX)
219 return 3;
220
221 if (ui->data_len < 0 || ui->data_len > UBIFS_MAX_INO_DATA)
222 return 4;
223
224 if (ui->xattr && !S_ISREG(inode->i_mode))
225 return 5;
226
227 if (!ubifs_compr_present(ui->compr_type)) {
228 ubifs_warn("inode %lu uses '%s' compression, but it was not compiled in",
229 inode->i_ino, ubifs_compr_name(ui->compr_type));
230 }
231
232 err = dbg_check_dir(c, inode);
233 return err;
234}
235
Stefan Roese2fc10f62009-03-19 15:35:05 +0100236struct inode *ubifs_iget(struct super_block *sb, unsigned long inum)
237{
238 int err;
239 union ubifs_key key;
240 struct ubifs_ino_node *ino;
241 struct ubifs_info *c = sb->s_fs_info;
242 struct inode *inode;
243 struct ubifs_inode *ui;
Heiko Schocherf5895d12014-06-24 10:10:04 +0200244#ifdef __UBOOT__
Stefan Roese2fc10f62009-03-19 15:35:05 +0100245 int i;
Heiko Schocherf5895d12014-06-24 10:10:04 +0200246#endif
Stefan Roese2fc10f62009-03-19 15:35:05 +0100247
248 dbg_gen("inode %lu", inum);
249
Heiko Schocherf5895d12014-06-24 10:10:04 +0200250#ifdef __UBOOT__
Stefan Roese2fc10f62009-03-19 15:35:05 +0100251 /*
252 * U-Boot special handling of locked down inodes via recovery
253 * e.g. ubifs_recover_size()
254 */
255 for (i = 0; i < INODE_LOCKED_MAX; i++) {
256 /*
257 * Exit on last entry (NULL), inode not found in list
258 */
259 if (inodes_locked_down[i] == NULL)
260 break;
261
262 if (inodes_locked_down[i]->i_ino == inum) {
263 /*
264 * We found the locked down inode in our array,
265 * so just return this pointer instead of creating
266 * a new one.
267 */
268 return inodes_locked_down[i];
269 }
270 }
Heiko Schocherf5895d12014-06-24 10:10:04 +0200271#endif
Stefan Roese2fc10f62009-03-19 15:35:05 +0100272
273 inode = iget_locked(sb, inum);
274 if (!inode)
275 return ERR_PTR(-ENOMEM);
276 if (!(inode->i_state & I_NEW))
277 return inode;
278 ui = ubifs_inode(inode);
279
280 ino = kmalloc(UBIFS_MAX_INO_NODE_SZ, GFP_NOFS);
281 if (!ino) {
282 err = -ENOMEM;
283 goto out;
284 }
285
286 ino_key_init(c, &key, inode->i_ino);
287
288 err = ubifs_tnc_lookup(c, &key, ino);
289 if (err)
290 goto out_ino;
291
292 inode->i_flags |= (S_NOCMTIME | S_NOATIME);
Heiko Schocherf5895d12014-06-24 10:10:04 +0200293 set_nlink(inode, le32_to_cpu(ino->nlink));
294 i_uid_write(inode, le32_to_cpu(ino->uid));
295 i_gid_write(inode, le32_to_cpu(ino->gid));
Stefan Roese2fc10f62009-03-19 15:35:05 +0100296 inode->i_atime.tv_sec = (int64_t)le64_to_cpu(ino->atime_sec);
297 inode->i_atime.tv_nsec = le32_to_cpu(ino->atime_nsec);
298 inode->i_mtime.tv_sec = (int64_t)le64_to_cpu(ino->mtime_sec);
299 inode->i_mtime.tv_nsec = le32_to_cpu(ino->mtime_nsec);
300 inode->i_ctime.tv_sec = (int64_t)le64_to_cpu(ino->ctime_sec);
301 inode->i_ctime.tv_nsec = le32_to_cpu(ino->ctime_nsec);
302 inode->i_mode = le32_to_cpu(ino->mode);
303 inode->i_size = le64_to_cpu(ino->size);
304
305 ui->data_len = le32_to_cpu(ino->data_len);
306 ui->flags = le32_to_cpu(ino->flags);
307 ui->compr_type = le16_to_cpu(ino->compr_type);
308 ui->creat_sqnum = le64_to_cpu(ino->creat_sqnum);
Heiko Schocherf5895d12014-06-24 10:10:04 +0200309 ui->xattr_cnt = le32_to_cpu(ino->xattr_cnt);
310 ui->xattr_size = le32_to_cpu(ino->xattr_size);
311 ui->xattr_names = le32_to_cpu(ino->xattr_names);
Stefan Roese2fc10f62009-03-19 15:35:05 +0100312 ui->synced_i_size = ui->ui_size = inode->i_size;
313
Heiko Schocherf5895d12014-06-24 10:10:04 +0200314 ui->xattr = (ui->flags & UBIFS_XATTR_FL) ? 1 : 0;
315
Stefan Roese2fc10f62009-03-19 15:35:05 +0100316 err = validate_inode(c, inode);
317 if (err)
318 goto out_invalid;
319
Heiko Schocherf5895d12014-06-24 10:10:04 +0200320#ifndef __UBOOT__
321 /* Disable read-ahead */
322 inode->i_mapping->backing_dev_info = &c->bdi;
323
324 switch (inode->i_mode & S_IFMT) {
325 case S_IFREG:
326 inode->i_mapping->a_ops = &ubifs_file_address_operations;
327 inode->i_op = &ubifs_file_inode_operations;
328 inode->i_fop = &ubifs_file_operations;
329 if (ui->xattr) {
330 ui->data = kmalloc(ui->data_len + 1, GFP_NOFS);
331 if (!ui->data) {
332 err = -ENOMEM;
333 goto out_ino;
334 }
335 memcpy(ui->data, ino->data, ui->data_len);
336 ((char *)ui->data)[ui->data_len] = '\0';
337 } else if (ui->data_len != 0) {
338 err = 10;
339 goto out_invalid;
340 }
341 break;
342 case S_IFDIR:
343 inode->i_op = &ubifs_dir_inode_operations;
344 inode->i_fop = &ubifs_dir_operations;
345 if (ui->data_len != 0) {
346 err = 11;
347 goto out_invalid;
348 }
349 break;
350 case S_IFLNK:
351 inode->i_op = &ubifs_symlink_inode_operations;
352 if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) {
353 err = 12;
354 goto out_invalid;
355 }
356 ui->data = kmalloc(ui->data_len + 1, GFP_NOFS);
357 if (!ui->data) {
358 err = -ENOMEM;
359 goto out_ino;
360 }
361 memcpy(ui->data, ino->data, ui->data_len);
362 ((char *)ui->data)[ui->data_len] = '\0';
363 break;
364 case S_IFBLK:
365 case S_IFCHR:
366 {
367 dev_t rdev;
368 union ubifs_dev_desc *dev;
369
370 ui->data = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
371 if (!ui->data) {
372 err = -ENOMEM;
373 goto out_ino;
374 }
375
376 dev = (union ubifs_dev_desc *)ino->data;
377 if (ui->data_len == sizeof(dev->new))
378 rdev = new_decode_dev(le32_to_cpu(dev->new));
379 else if (ui->data_len == sizeof(dev->huge))
380 rdev = huge_decode_dev(le64_to_cpu(dev->huge));
381 else {
382 err = 13;
383 goto out_invalid;
384 }
385 memcpy(ui->data, ino->data, ui->data_len);
386 inode->i_op = &ubifs_file_inode_operations;
387 init_special_inode(inode, inode->i_mode, rdev);
388 break;
389 }
390 case S_IFSOCK:
391 case S_IFIFO:
392 inode->i_op = &ubifs_file_inode_operations;
393 init_special_inode(inode, inode->i_mode, 0);
394 if (ui->data_len != 0) {
395 err = 14;
396 goto out_invalid;
397 }
398 break;
399 default:
400 err = 15;
401 goto out_invalid;
402 }
403#else
Stefan Roese2fc10f62009-03-19 15:35:05 +0100404 if ((inode->i_mode & S_IFMT) == S_IFLNK) {
405 if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) {
406 err = 12;
407 goto out_invalid;
408 }
409 ui->data = kmalloc(ui->data_len + 1, GFP_NOFS);
410 if (!ui->data) {
411 err = -ENOMEM;
412 goto out_ino;
413 }
414 memcpy(ui->data, ino->data, ui->data_len);
415 ((char *)ui->data)[ui->data_len] = '\0';
416 }
Heiko Schocherf5895d12014-06-24 10:10:04 +0200417#endif
Stefan Roese2fc10f62009-03-19 15:35:05 +0100418
419 kfree(ino);
Heiko Schocherf5895d12014-06-24 10:10:04 +0200420#ifndef __UBOOT__
421 ubifs_set_inode_flags(inode);
422#endif
423 unlock_new_inode(inode);
Stefan Roese2fc10f62009-03-19 15:35:05 +0100424 return inode;
425
426out_invalid:
427 ubifs_err("inode %lu validation failed, error %d", inode->i_ino, err);
Heiko Schocherf5895d12014-06-24 10:10:04 +0200428 ubifs_dump_node(c, ino);
429 ubifs_dump_inode(c, inode);
Stefan Roese2fc10f62009-03-19 15:35:05 +0100430 err = -EINVAL;
431out_ino:
432 kfree(ino);
433out:
434 ubifs_err("failed to read inode %lu, error %d", inode->i_ino, err);
Heiko Schocherf5895d12014-06-24 10:10:04 +0200435 iget_failed(inode);
Stefan Roese2fc10f62009-03-19 15:35:05 +0100436 return ERR_PTR(err);
437}
438
Heiko Schocherf5895d12014-06-24 10:10:04 +0200439static struct inode *ubifs_alloc_inode(struct super_block *sb)
Stefan Roese2fc10f62009-03-19 15:35:05 +0100440{
Heiko Schocherf5895d12014-06-24 10:10:04 +0200441 struct ubifs_inode *ui;
Stefan Roese2fc10f62009-03-19 15:35:05 +0100442
Heiko Schocherf5895d12014-06-24 10:10:04 +0200443 ui = kmem_cache_alloc(ubifs_inode_slab, GFP_NOFS);
444 if (!ui)
445 return NULL;
Stefan Roese2fc10f62009-03-19 15:35:05 +0100446
Heiko Schocherf5895d12014-06-24 10:10:04 +0200447 memset((void *)ui + sizeof(struct inode), 0,
448 sizeof(struct ubifs_inode) - sizeof(struct inode));
449 mutex_init(&ui->ui_mutex);
450 spin_lock_init(&ui->ui_lock);
451 return &ui->vfs_inode;
452};
Stefan Roese2fc10f62009-03-19 15:35:05 +0100453
Heiko Schocherf5895d12014-06-24 10:10:04 +0200454#ifndef __UBOOT__
455static void ubifs_i_callback(struct rcu_head *head)
456{
457 struct inode *inode = container_of(head, struct inode, i_rcu);
458 struct ubifs_inode *ui = ubifs_inode(inode);
459 kmem_cache_free(ubifs_inode_slab, ui);
460}
Stefan Roese2fc10f62009-03-19 15:35:05 +0100461
Heiko Schocherf5895d12014-06-24 10:10:04 +0200462static void ubifs_destroy_inode(struct inode *inode)
463{
464 struct ubifs_inode *ui = ubifs_inode(inode);
Stefan Roese2fc10f62009-03-19 15:35:05 +0100465
Heiko Schocherf5895d12014-06-24 10:10:04 +0200466 kfree(ui->data);
467 call_rcu(&inode->i_rcu, ubifs_i_callback);
468}
Stefan Roese2fc10f62009-03-19 15:35:05 +0100469
Heiko Schocherf5895d12014-06-24 10:10:04 +0200470/*
471 * Note, Linux write-back code calls this without 'i_mutex'.
472 */
473static int ubifs_write_inode(struct inode *inode, struct writeback_control *wbc)
474{
475 int err = 0;
476 struct ubifs_info *c = inode->i_sb->s_fs_info;
477 struct ubifs_inode *ui = ubifs_inode(inode);
478
479 ubifs_assert(!ui->xattr);
480 if (is_bad_inode(inode))
481 return 0;
Stefan Roese2fc10f62009-03-19 15:35:05 +0100482
Heiko Schocherf5895d12014-06-24 10:10:04 +0200483 mutex_lock(&ui->ui_mutex);
Stefan Roese2fc10f62009-03-19 15:35:05 +0100484 /*
Heiko Schocherf5895d12014-06-24 10:10:04 +0200485 * Due to races between write-back forced by budgeting
486 * (see 'sync_some_inodes()') and background write-back, the inode may
487 * have already been synchronized, do not do this again. This might
488 * also happen if it was synchronized in an VFS operation, e.g.
489 * 'ubifs_link()'.
Stefan Roese2fc10f62009-03-19 15:35:05 +0100490 */
Heiko Schocherf5895d12014-06-24 10:10:04 +0200491 if (!ui->dirty) {
492 mutex_unlock(&ui->ui_mutex);
493 return 0;
Stefan Roese2fc10f62009-03-19 15:35:05 +0100494 }
495
Stefan Roese2fc10f62009-03-19 15:35:05 +0100496 /*
Heiko Schocherf5895d12014-06-24 10:10:04 +0200497 * As an optimization, do not write orphan inodes to the media just
498 * because this is not needed.
Stefan Roese2fc10f62009-03-19 15:35:05 +0100499 */
Heiko Schocherf5895d12014-06-24 10:10:04 +0200500 dbg_gen("inode %lu, mode %#x, nlink %u",
501 inode->i_ino, (int)inode->i_mode, inode->i_nlink);
502 if (inode->i_nlink) {
503 err = ubifs_jnl_write_inode(c, inode);
504 if (err)
505 ubifs_err("can't write inode %lu, error %d",
506 inode->i_ino, err);
507 else
508 err = dbg_check_inode_size(c, inode, ui->ui_size);
509 }
Stefan Roese2fc10f62009-03-19 15:35:05 +0100510
Heiko Schocherf5895d12014-06-24 10:10:04 +0200511 ui->dirty = 0;
512 mutex_unlock(&ui->ui_mutex);
513 ubifs_release_dirty_inode_budget(c, ui);
514 return err;
515}
516
517static void ubifs_evict_inode(struct inode *inode)
518{
519 int err;
520 struct ubifs_info *c = inode->i_sb->s_fs_info;
521 struct ubifs_inode *ui = ubifs_inode(inode);
522
523 if (ui->xattr)
524 /*
525 * Extended attribute inode deletions are fully handled in
526 * 'ubifs_removexattr()'. These inodes are special and have
527 * limited usage, so there is nothing to do here.
528 */
529 goto out;
530
531 dbg_gen("inode %lu, mode %#x", inode->i_ino, (int)inode->i_mode);
532 ubifs_assert(!atomic_read(&inode->i_count));
533
Heiko Schocher081fe9e2014-07-15 16:08:43 +0200534 truncate_inode_pages_final(&inode->i_data);
Heiko Schocherf5895d12014-06-24 10:10:04 +0200535
536 if (inode->i_nlink)
537 goto done;
538
539 if (is_bad_inode(inode))
540 goto out;
541
542 ui->ui_size = inode->i_size = 0;
543 err = ubifs_jnl_delete_inode(c, inode);
544 if (err)
545 /*
546 * Worst case we have a lost orphan inode wasting space, so a
547 * simple error message is OK here.
548 */
549 ubifs_err("can't delete inode %lu, error %d",
550 inode->i_ino, err);
551
552out:
553 if (ui->dirty)
554 ubifs_release_dirty_inode_budget(c, ui);
555 else {
556 /* We've deleted something - clean the "no space" flags */
557 c->bi.nospace = c->bi.nospace_rp = 0;
558 smp_wmb();
559 }
560done:
561 clear_inode(inode);
562}
563#endif
564
565static void ubifs_dirty_inode(struct inode *inode, int flags)
566{
567 struct ubifs_inode *ui = ubifs_inode(inode);
568
569 ubifs_assert(mutex_is_locked(&ui->ui_mutex));
570 if (!ui->dirty) {
571 ui->dirty = 1;
572 dbg_gen("inode %lu", inode->i_ino);
573 }
574}
575
576#ifndef __UBOOT__
577static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf)
578{
579 struct ubifs_info *c = dentry->d_sb->s_fs_info;
580 unsigned long long free;
581 __le32 *uuid = (__le32 *)c->uuid;
582
583 free = ubifs_get_free_space(c);
584 dbg_gen("free space %lld bytes (%lld blocks)",
585 free, free >> UBIFS_BLOCK_SHIFT);
586
587 buf->f_type = UBIFS_SUPER_MAGIC;
588 buf->f_bsize = UBIFS_BLOCK_SIZE;
589 buf->f_blocks = c->block_cnt;
590 buf->f_bfree = free >> UBIFS_BLOCK_SHIFT;
591 if (free > c->report_rp_size)
592 buf->f_bavail = (free - c->report_rp_size) >> UBIFS_BLOCK_SHIFT;
593 else
594 buf->f_bavail = 0;
595 buf->f_files = 0;
596 buf->f_ffree = 0;
597 buf->f_namelen = UBIFS_MAX_NLEN;
598 buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]);
599 buf->f_fsid.val[1] = le32_to_cpu(uuid[1]) ^ le32_to_cpu(uuid[3]);
600 ubifs_assert(buf->f_bfree <= c->block_cnt);
601 return 0;
602}
603
604static int ubifs_show_options(struct seq_file *s, struct dentry *root)
605{
606 struct ubifs_info *c = root->d_sb->s_fs_info;
607
608 if (c->mount_opts.unmount_mode == 2)
609 seq_printf(s, ",fast_unmount");
610 else if (c->mount_opts.unmount_mode == 1)
611 seq_printf(s, ",norm_unmount");
612
613 if (c->mount_opts.bulk_read == 2)
614 seq_printf(s, ",bulk_read");
615 else if (c->mount_opts.bulk_read == 1)
616 seq_printf(s, ",no_bulk_read");
617
618 if (c->mount_opts.chk_data_crc == 2)
619 seq_printf(s, ",chk_data_crc");
620 else if (c->mount_opts.chk_data_crc == 1)
621 seq_printf(s, ",no_chk_data_crc");
622
623 if (c->mount_opts.override_compr) {
624 seq_printf(s, ",compr=%s",
625 ubifs_compr_name(c->mount_opts.compr_type));
626 }
627
628 return 0;
629}
630
631static int ubifs_sync_fs(struct super_block *sb, int wait)
632{
633 int i, err;
634 struct ubifs_info *c = sb->s_fs_info;
635
636 /*
637 * Zero @wait is just an advisory thing to help the file system shove
638 * lots of data into the queues, and there will be the second
639 * '->sync_fs()' call, with non-zero @wait.
640 */
641 if (!wait)
642 return 0;
643
644 /*
645 * Synchronize write buffers, because 'ubifs_run_commit()' does not
646 * do this if it waits for an already running commit.
647 */
648 for (i = 0; i < c->jhead_cnt; i++) {
649 err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
650 if (err)
651 return err;
652 }
653
654 /*
655 * Strictly speaking, it is not necessary to commit the journal here,
656 * synchronizing write-buffers would be enough. But committing makes
657 * UBIFS free space predictions much more accurate, so we want to let
658 * the user be able to get more accurate results of 'statfs()' after
659 * they synchronize the file system.
660 */
661 err = ubifs_run_commit(c);
662 if (err)
663 return err;
664
665 return ubi_sync(c->vi.ubi_num);
666}
667#endif
668
669/**
670 * init_constants_early - initialize UBIFS constants.
671 * @c: UBIFS file-system description object
672 *
673 * This function initialize UBIFS constants which do not need the superblock to
674 * be read. It also checks that the UBI volume satisfies basic UBIFS
675 * requirements. Returns zero in case of success and a negative error code in
676 * case of failure.
677 */
678static int init_constants_early(struct ubifs_info *c)
679{
680 if (c->vi.corrupted) {
681 ubifs_warn("UBI volume is corrupted - read-only mode");
682 c->ro_media = 1;
683 }
684
685 if (c->di.ro_mode) {
686 ubifs_msg("read-only UBI device");
687 c->ro_media = 1;
688 }
689
690 if (c->vi.vol_type == UBI_STATIC_VOLUME) {
691 ubifs_msg("static UBI volume - read-only mode");
692 c->ro_media = 1;
693 }
694
695 c->leb_cnt = c->vi.size;
696 c->leb_size = c->vi.usable_leb_size;
697 c->leb_start = c->di.leb_start;
698 c->half_leb_size = c->leb_size / 2;
699 c->min_io_size = c->di.min_io_size;
700 c->min_io_shift = fls(c->min_io_size) - 1;
701 c->max_write_size = c->di.max_write_size;
702 c->max_write_shift = fls(c->max_write_size) - 1;
703
704 if (c->leb_size < UBIFS_MIN_LEB_SZ) {
705 ubifs_err("too small LEBs (%d bytes), min. is %d bytes",
706 c->leb_size, UBIFS_MIN_LEB_SZ);
707 return -EINVAL;
708 }
709
710 if (c->leb_cnt < UBIFS_MIN_LEB_CNT) {
711 ubifs_err("too few LEBs (%d), min. is %d",
712 c->leb_cnt, UBIFS_MIN_LEB_CNT);
713 return -EINVAL;
714 }
715
716 if (!is_power_of_2(c->min_io_size)) {
717 ubifs_err("bad min. I/O size %d", c->min_io_size);
718 return -EINVAL;
719 }
720
721 /*
722 * Maximum write size has to be greater or equivalent to min. I/O
723 * size, and be multiple of min. I/O size.
724 */
725 if (c->max_write_size < c->min_io_size ||
726 c->max_write_size % c->min_io_size ||
727 !is_power_of_2(c->max_write_size)) {
728 ubifs_err("bad write buffer size %d for %d min. I/O unit",
729 c->max_write_size, c->min_io_size);
730 return -EINVAL;
731 }
732
733 /*
734 * UBIFS aligns all node to 8-byte boundary, so to make function in
735 * io.c simpler, assume minimum I/O unit size to be 8 bytes if it is
736 * less than 8.
737 */
738 if (c->min_io_size < 8) {
739 c->min_io_size = 8;
740 c->min_io_shift = 3;
741 if (c->max_write_size < c->min_io_size) {
742 c->max_write_size = c->min_io_size;
743 c->max_write_shift = c->min_io_shift;
744 }
745 }
746
747 c->ref_node_alsz = ALIGN(UBIFS_REF_NODE_SZ, c->min_io_size);
748 c->mst_node_alsz = ALIGN(UBIFS_MST_NODE_SZ, c->min_io_size);
749
750 /*
751 * Initialize node length ranges which are mostly needed for node
752 * length validation.
753 */
754 c->ranges[UBIFS_PAD_NODE].len = UBIFS_PAD_NODE_SZ;
755 c->ranges[UBIFS_SB_NODE].len = UBIFS_SB_NODE_SZ;
756 c->ranges[UBIFS_MST_NODE].len = UBIFS_MST_NODE_SZ;
757 c->ranges[UBIFS_REF_NODE].len = UBIFS_REF_NODE_SZ;
758 c->ranges[UBIFS_TRUN_NODE].len = UBIFS_TRUN_NODE_SZ;
759 c->ranges[UBIFS_CS_NODE].len = UBIFS_CS_NODE_SZ;
760
761 c->ranges[UBIFS_INO_NODE].min_len = UBIFS_INO_NODE_SZ;
762 c->ranges[UBIFS_INO_NODE].max_len = UBIFS_MAX_INO_NODE_SZ;
763 c->ranges[UBIFS_ORPH_NODE].min_len =
Stefan Roese2fc10f62009-03-19 15:35:05 +0100764 UBIFS_ORPH_NODE_SZ + sizeof(__le64);
765 c->ranges[UBIFS_ORPH_NODE].max_len = c->leb_size;
766 c->ranges[UBIFS_DENT_NODE].min_len = UBIFS_DENT_NODE_SZ;
767 c->ranges[UBIFS_DENT_NODE].max_len = UBIFS_MAX_DENT_NODE_SZ;
768 c->ranges[UBIFS_XENT_NODE].min_len = UBIFS_XENT_NODE_SZ;
769 c->ranges[UBIFS_XENT_NODE].max_len = UBIFS_MAX_XENT_NODE_SZ;
770 c->ranges[UBIFS_DATA_NODE].min_len = UBIFS_DATA_NODE_SZ;
771 c->ranges[UBIFS_DATA_NODE].max_len = UBIFS_MAX_DATA_NODE_SZ;
772 /*
773 * Minimum indexing node size is amended later when superblock is
774 * read and the key length is known.
775 */
776 c->ranges[UBIFS_IDX_NODE].min_len = UBIFS_IDX_NODE_SZ + UBIFS_BRANCH_SZ;
777 /*
778 * Maximum indexing node size is amended later when superblock is
779 * read and the fanout is known.
780 */
781 c->ranges[UBIFS_IDX_NODE].max_len = INT_MAX;
782
783 /*
784 * Initialize dead and dark LEB space watermarks. See gc.c for comments
785 * about these values.
786 */
787 c->dead_wm = ALIGN(MIN_WRITE_SZ, c->min_io_size);
788 c->dark_wm = ALIGN(UBIFS_MAX_NODE_SZ, c->min_io_size);
789
790 /*
791 * Calculate how many bytes would be wasted at the end of LEB if it was
792 * fully filled with data nodes of maximum size. This is used in
793 * calculations when reporting free space.
794 */
795 c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ;
796
Heiko Schocherf5895d12014-06-24 10:10:04 +0200797 /* Buffer size for bulk-reads */
798 c->max_bu_buf_len = UBIFS_MAX_BULK_READ * UBIFS_MAX_DATA_NODE_SZ;
799 if (c->max_bu_buf_len > c->leb_size)
800 c->max_bu_buf_len = c->leb_size;
Stefan Roese2fc10f62009-03-19 15:35:05 +0100801 return 0;
802}
803
Heiko Schocherf5895d12014-06-24 10:10:04 +0200804/**
805 * bud_wbuf_callback - bud LEB write-buffer synchronization call-back.
806 * @c: UBIFS file-system description object
807 * @lnum: LEB the write-buffer was synchronized to
808 * @free: how many free bytes left in this LEB
809 * @pad: how many bytes were padded
810 *
811 * This is a callback function which is called by the I/O unit when the
812 * write-buffer is synchronized. We need this to correctly maintain space
813 * accounting in bud logical eraseblocks. This function returns zero in case of
814 * success and a negative error code in case of failure.
815 *
816 * This function actually belongs to the journal, but we keep it here because
817 * we want to keep it static.
818 */
819static int bud_wbuf_callback(struct ubifs_info *c, int lnum, int free, int pad)
820{
821 return ubifs_update_one_lp(c, lnum, free, pad, 0, 0);
822}
823
Stefan Roese2fc10f62009-03-19 15:35:05 +0100824/*
825 * init_constants_sb - initialize UBIFS constants.
826 * @c: UBIFS file-system description object
827 *
828 * This is a helper function which initializes various UBIFS constants after
829 * the superblock has been read. It also checks various UBIFS parameters and
830 * makes sure they are all right. Returns zero in case of success and a
831 * negative error code in case of failure.
832 */
833static int init_constants_sb(struct ubifs_info *c)
834{
835 int tmp, err;
836 long long tmp64;
837
838 c->main_bytes = (long long)c->main_lebs * c->leb_size;
839 c->max_znode_sz = sizeof(struct ubifs_znode) +
840 c->fanout * sizeof(struct ubifs_zbranch);
841
842 tmp = ubifs_idx_node_sz(c, 1);
843 c->ranges[UBIFS_IDX_NODE].min_len = tmp;
844 c->min_idx_node_sz = ALIGN(tmp, 8);
845
846 tmp = ubifs_idx_node_sz(c, c->fanout);
847 c->ranges[UBIFS_IDX_NODE].max_len = tmp;
848 c->max_idx_node_sz = ALIGN(tmp, 8);
849
850 /* Make sure LEB size is large enough to fit full commit */
851 tmp = UBIFS_CS_NODE_SZ + UBIFS_REF_NODE_SZ * c->jhead_cnt;
852 tmp = ALIGN(tmp, c->min_io_size);
853 if (tmp > c->leb_size) {
Heiko Schocherf5895d12014-06-24 10:10:04 +0200854 ubifs_err("too small LEB size %d, at least %d needed",
855 c->leb_size, tmp);
Stefan Roese2fc10f62009-03-19 15:35:05 +0100856 return -EINVAL;
857 }
858
859 /*
860 * Make sure that the log is large enough to fit reference nodes for
861 * all buds plus one reserved LEB.
862 */
863 tmp64 = c->max_bud_bytes + c->leb_size - 1;
864 c->max_bud_cnt = div_u64(tmp64, c->leb_size);
865 tmp = (c->ref_node_alsz * c->max_bud_cnt + c->leb_size - 1);
866 tmp /= c->leb_size;
867 tmp += 1;
868 if (c->log_lebs < tmp) {
Heiko Schocherf5895d12014-06-24 10:10:04 +0200869 ubifs_err("too small log %d LEBs, required min. %d LEBs",
870 c->log_lebs, tmp);
Stefan Roese2fc10f62009-03-19 15:35:05 +0100871 return -EINVAL;
872 }
873
874 /*
875 * When budgeting we assume worst-case scenarios when the pages are not
876 * be compressed and direntries are of the maximum size.
877 *
878 * Note, data, which may be stored in inodes is budgeted separately, so
Heiko Schocherf5895d12014-06-24 10:10:04 +0200879 * it is not included into 'c->bi.inode_budget'.
Stefan Roese2fc10f62009-03-19 15:35:05 +0100880 */
Heiko Schocherf5895d12014-06-24 10:10:04 +0200881 c->bi.page_budget = UBIFS_MAX_DATA_NODE_SZ * UBIFS_BLOCKS_PER_PAGE;
882 c->bi.inode_budget = UBIFS_INO_NODE_SZ;
883 c->bi.dent_budget = UBIFS_MAX_DENT_NODE_SZ;
Stefan Roese2fc10f62009-03-19 15:35:05 +0100884
885 /*
886 * When the amount of flash space used by buds becomes
887 * 'c->max_bud_bytes', UBIFS just blocks all writers and starts commit.
888 * The writers are unblocked when the commit is finished. To avoid
889 * writers to be blocked UBIFS initiates background commit in advance,
890 * when number of bud bytes becomes above the limit defined below.
891 */
892 c->bg_bud_bytes = (c->max_bud_bytes * 13) >> 4;
893
894 /*
895 * Ensure minimum journal size. All the bytes in the journal heads are
896 * considered to be used, when calculating the current journal usage.
897 * Consequently, if the journal is too small, UBIFS will treat it as
898 * always full.
899 */
900 tmp64 = (long long)(c->jhead_cnt + 1) * c->leb_size + 1;
901 if (c->bg_bud_bytes < tmp64)
902 c->bg_bud_bytes = tmp64;
903 if (c->max_bud_bytes < tmp64 + c->leb_size)
904 c->max_bud_bytes = tmp64 + c->leb_size;
905
906 err = ubifs_calc_lpt_geom(c);
907 if (err)
908 return err;
909
Heiko Schocherf5895d12014-06-24 10:10:04 +0200910 /* Initialize effective LEB size used in budgeting calculations */
911 c->idx_leb_size = c->leb_size - c->max_idx_node_sz;
Stefan Roese2fc10f62009-03-19 15:35:05 +0100912 return 0;
913}
914
915/*
916 * init_constants_master - initialize UBIFS constants.
917 * @c: UBIFS file-system description object
918 *
919 * This is a helper function which initializes various UBIFS constants after
920 * the master node has been read. It also checks various UBIFS parameters and
921 * makes sure they are all right.
922 */
923static void init_constants_master(struct ubifs_info *c)
924{
925 long long tmp64;
926
Heiko Schocherf5895d12014-06-24 10:10:04 +0200927 c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c);
928 c->report_rp_size = ubifs_reported_space(c, c->rp_size);
Stefan Roese2fc10f62009-03-19 15:35:05 +0100929
930 /*
931 * Calculate total amount of FS blocks. This number is not used
932 * internally because it does not make much sense for UBIFS, but it is
933 * necessary to report something for the 'statfs()' call.
934 *
935 * Subtract the LEB reserved for GC, the LEB which is reserved for
936 * deletions, minimum LEBs for the index, and assume only one journal
937 * head is available.
938 */
939 tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1;
940 tmp64 *= (long long)c->leb_size - c->leb_overhead;
941 tmp64 = ubifs_reported_space(c, tmp64);
942 c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT;
943}
944
945/**
Heiko Schocherf5895d12014-06-24 10:10:04 +0200946 * take_gc_lnum - reserve GC LEB.
947 * @c: UBIFS file-system description object
948 *
949 * This function ensures that the LEB reserved for garbage collection is marked
950 * as "taken" in lprops. We also have to set free space to LEB size and dirty
951 * space to zero, because lprops may contain out-of-date information if the
952 * file-system was un-mounted before it has been committed. This function
953 * returns zero in case of success and a negative error code in case of
954 * failure.
955 */
956static int take_gc_lnum(struct ubifs_info *c)
957{
958 int err;
959
960 if (c->gc_lnum == -1) {
961 ubifs_err("no LEB for GC");
962 return -EINVAL;
963 }
964
965 /* And we have to tell lprops that this LEB is taken */
966 err = ubifs_change_one_lp(c, c->gc_lnum, c->leb_size, 0,
967 LPROPS_TAKEN, 0, 0);
968 return err;
969}
970
971/**
972 * alloc_wbufs - allocate write-buffers.
973 * @c: UBIFS file-system description object
974 *
975 * This helper function allocates and initializes UBIFS write-buffers. Returns
976 * zero in case of success and %-ENOMEM in case of failure.
977 */
978static int alloc_wbufs(struct ubifs_info *c)
979{
980 int i, err;
981
982 c->jheads = kzalloc(c->jhead_cnt * sizeof(struct ubifs_jhead),
983 GFP_KERNEL);
984 if (!c->jheads)
985 return -ENOMEM;
986
987 /* Initialize journal heads */
988 for (i = 0; i < c->jhead_cnt; i++) {
989 INIT_LIST_HEAD(&c->jheads[i].buds_list);
990 err = ubifs_wbuf_init(c, &c->jheads[i].wbuf);
991 if (err)
992 return err;
993
994 c->jheads[i].wbuf.sync_callback = &bud_wbuf_callback;
995 c->jheads[i].wbuf.jhead = i;
996 c->jheads[i].grouped = 1;
997 }
998
999 /*
1000 * Garbage Collector head does not need to be synchronized by timer.
1001 * Also GC head nodes are not grouped.
1002 */
1003 c->jheads[GCHD].wbuf.no_timer = 1;
1004 c->jheads[GCHD].grouped = 0;
1005
1006 return 0;
1007}
1008
1009/**
1010 * free_wbufs - free write-buffers.
1011 * @c: UBIFS file-system description object
1012 */
1013static void free_wbufs(struct ubifs_info *c)
1014{
1015 int i;
1016
1017 if (c->jheads) {
1018 for (i = 0; i < c->jhead_cnt; i++) {
1019 kfree(c->jheads[i].wbuf.buf);
1020 kfree(c->jheads[i].wbuf.inodes);
1021 }
1022 kfree(c->jheads);
1023 c->jheads = NULL;
1024 }
1025}
1026
1027/**
Stefan Roese2fc10f62009-03-19 15:35:05 +01001028 * free_orphans - free orphans.
1029 * @c: UBIFS file-system description object
1030 */
1031static void free_orphans(struct ubifs_info *c)
1032{
1033 struct ubifs_orphan *orph;
1034
1035 while (c->orph_dnext) {
1036 orph = c->orph_dnext;
1037 c->orph_dnext = orph->dnext;
1038 list_del(&orph->list);
1039 kfree(orph);
1040 }
1041
1042 while (!list_empty(&c->orph_list)) {
1043 orph = list_entry(c->orph_list.next, struct ubifs_orphan, list);
1044 list_del(&orph->list);
1045 kfree(orph);
Heiko Schocherf5895d12014-06-24 10:10:04 +02001046 ubifs_err("orphan list not empty at unmount");
Stefan Roese2fc10f62009-03-19 15:35:05 +01001047 }
1048
1049 vfree(c->orph_buf);
1050 c->orph_buf = NULL;
1051}
Heiko Schocherf5895d12014-06-24 10:10:04 +02001052
Heiko Schocherf5895d12014-06-24 10:10:04 +02001053/**
1054 * free_buds - free per-bud objects.
1055 * @c: UBIFS file-system description object
1056 */
1057static void free_buds(struct ubifs_info *c)
1058{
1059 struct ubifs_bud *bud, *n;
1060
1061 rbtree_postorder_for_each_entry_safe(bud, n, &c->buds, rb)
1062 kfree(bud);
1063}
Stefan Roese2fc10f62009-03-19 15:35:05 +01001064
1065/**
1066 * check_volume_empty - check if the UBI volume is empty.
1067 * @c: UBIFS file-system description object
1068 *
1069 * This function checks if the UBIFS volume is empty by looking if its LEBs are
1070 * mapped or not. The result of checking is stored in the @c->empty variable.
1071 * Returns zero in case of success and a negative error code in case of
1072 * failure.
1073 */
1074static int check_volume_empty(struct ubifs_info *c)
1075{
1076 int lnum, err;
1077
1078 c->empty = 1;
1079 for (lnum = 0; lnum < c->leb_cnt; lnum++) {
Heiko Schocherf5895d12014-06-24 10:10:04 +02001080 err = ubifs_is_mapped(c, lnum);
Stefan Roese2fc10f62009-03-19 15:35:05 +01001081 if (unlikely(err < 0))
1082 return err;
1083 if (err == 1) {
1084 c->empty = 0;
1085 break;
1086 }
1087
1088 cond_resched();
1089 }
1090
1091 return 0;
1092}
1093
Heiko Schocherf5895d12014-06-24 10:10:04 +02001094/*
1095 * UBIFS mount options.
1096 *
1097 * Opt_fast_unmount: do not run a journal commit before un-mounting
1098 * Opt_norm_unmount: run a journal commit before un-mounting
1099 * Opt_bulk_read: enable bulk-reads
1100 * Opt_no_bulk_read: disable bulk-reads
1101 * Opt_chk_data_crc: check CRCs when reading data nodes
1102 * Opt_no_chk_data_crc: do not check CRCs when reading data nodes
1103 * Opt_override_compr: override default compressor
1104 * Opt_err: just end of array marker
1105 */
1106enum {
1107 Opt_fast_unmount,
1108 Opt_norm_unmount,
1109 Opt_bulk_read,
1110 Opt_no_bulk_read,
1111 Opt_chk_data_crc,
1112 Opt_no_chk_data_crc,
1113 Opt_override_compr,
1114 Opt_err,
1115};
1116
1117#ifndef __UBOOT__
1118static const match_table_t tokens = {
1119 {Opt_fast_unmount, "fast_unmount"},
1120 {Opt_norm_unmount, "norm_unmount"},
1121 {Opt_bulk_read, "bulk_read"},
1122 {Opt_no_bulk_read, "no_bulk_read"},
1123 {Opt_chk_data_crc, "chk_data_crc"},
1124 {Opt_no_chk_data_crc, "no_chk_data_crc"},
1125 {Opt_override_compr, "compr=%s"},
1126 {Opt_err, NULL},
1127};
1128
1129/**
1130 * parse_standard_option - parse a standard mount option.
1131 * @option: the option to parse
1132 *
1133 * Normally, standard mount options like "sync" are passed to file-systems as
1134 * flags. However, when a "rootflags=" kernel boot parameter is used, they may
1135 * be present in the options string. This function tries to deal with this
1136 * situation and parse standard options. Returns 0 if the option was not
1137 * recognized, and the corresponding integer flag if it was.
1138 *
1139 * UBIFS is only interested in the "sync" option, so do not check for anything
1140 * else.
1141 */
1142static int parse_standard_option(const char *option)
1143{
1144 ubifs_msg("parse %s", option);
1145 if (!strcmp(option, "sync"))
1146 return MS_SYNCHRONOUS;
1147 return 0;
1148}
1149
1150/**
1151 * ubifs_parse_options - parse mount parameters.
1152 * @c: UBIFS file-system description object
1153 * @options: parameters to parse
1154 * @is_remount: non-zero if this is FS re-mount
1155 *
1156 * This function parses UBIFS mount options and returns zero in case success
1157 * and a negative error code in case of failure.
1158 */
1159static int ubifs_parse_options(struct ubifs_info *c, char *options,
1160 int is_remount)
1161{
1162 char *p;
1163 substring_t args[MAX_OPT_ARGS];
1164
1165 if (!options)
1166 return 0;
1167
1168 while ((p = strsep(&options, ","))) {
1169 int token;
1170
1171 if (!*p)
1172 continue;
1173
1174 token = match_token(p, tokens, args);
1175 switch (token) {
1176 /*
1177 * %Opt_fast_unmount and %Opt_norm_unmount options are ignored.
1178 * We accept them in order to be backward-compatible. But this
1179 * should be removed at some point.
1180 */
1181 case Opt_fast_unmount:
1182 c->mount_opts.unmount_mode = 2;
1183 break;
1184 case Opt_norm_unmount:
1185 c->mount_opts.unmount_mode = 1;
1186 break;
1187 case Opt_bulk_read:
1188 c->mount_opts.bulk_read = 2;
1189 c->bulk_read = 1;
1190 break;
1191 case Opt_no_bulk_read:
1192 c->mount_opts.bulk_read = 1;
1193 c->bulk_read = 0;
1194 break;
1195 case Opt_chk_data_crc:
1196 c->mount_opts.chk_data_crc = 2;
1197 c->no_chk_data_crc = 0;
1198 break;
1199 case Opt_no_chk_data_crc:
1200 c->mount_opts.chk_data_crc = 1;
1201 c->no_chk_data_crc = 1;
1202 break;
1203 case Opt_override_compr:
1204 {
1205 char *name = match_strdup(&args[0]);
1206
1207 if (!name)
1208 return -ENOMEM;
1209 if (!strcmp(name, "none"))
1210 c->mount_opts.compr_type = UBIFS_COMPR_NONE;
1211 else if (!strcmp(name, "lzo"))
1212 c->mount_opts.compr_type = UBIFS_COMPR_LZO;
1213 else if (!strcmp(name, "zlib"))
1214 c->mount_opts.compr_type = UBIFS_COMPR_ZLIB;
1215 else {
1216 ubifs_err("unknown compressor \"%s\"", name);
1217 kfree(name);
1218 return -EINVAL;
1219 }
1220 kfree(name);
1221 c->mount_opts.override_compr = 1;
1222 c->default_compr = c->mount_opts.compr_type;
1223 break;
1224 }
1225 default:
1226 {
1227 unsigned long flag;
1228 struct super_block *sb = c->vfs_sb;
1229
1230 flag = parse_standard_option(p);
1231 if (!flag) {
1232 ubifs_err("unrecognized mount option \"%s\" or missing value",
1233 p);
1234 return -EINVAL;
1235 }
1236 sb->s_flags |= flag;
1237 break;
1238 }
1239 }
1240 }
1241
1242 return 0;
1243}
Anton Habegger7c470312015-01-22 22:29:11 +01001244#endif
Heiko Schocherf5895d12014-06-24 10:10:04 +02001245
Stefan Roese2fc10f62009-03-19 15:35:05 +01001246/**
Heiko Schocherf5895d12014-06-24 10:10:04 +02001247 * destroy_journal - destroy journal data structures.
1248 * @c: UBIFS file-system description object
1249 *
1250 * This function destroys journal data structures including those that may have
1251 * been created by recovery functions.
1252 */
1253static void destroy_journal(struct ubifs_info *c)
1254{
1255 while (!list_empty(&c->unclean_leb_list)) {
1256 struct ubifs_unclean_leb *ucleb;
1257
1258 ucleb = list_entry(c->unclean_leb_list.next,
1259 struct ubifs_unclean_leb, list);
1260 list_del(&ucleb->list);
1261 kfree(ucleb);
1262 }
1263 while (!list_empty(&c->old_buds)) {
1264 struct ubifs_bud *bud;
1265
1266 bud = list_entry(c->old_buds.next, struct ubifs_bud, list);
1267 list_del(&bud->list);
1268 kfree(bud);
1269 }
1270 ubifs_destroy_idx_gc(c);
1271 ubifs_destroy_size_tree(c);
1272 ubifs_tnc_close(c);
1273 free_buds(c);
1274}
Heiko Schocherf5895d12014-06-24 10:10:04 +02001275
1276/**
1277 * bu_init - initialize bulk-read information.
1278 * @c: UBIFS file-system description object
1279 */
1280static void bu_init(struct ubifs_info *c)
1281{
1282 ubifs_assert(c->bulk_read == 1);
1283
1284 if (c->bu.buf)
1285 return; /* Already initialized */
1286
1287again:
1288 c->bu.buf = kmalloc(c->max_bu_buf_len, GFP_KERNEL | __GFP_NOWARN);
1289 if (!c->bu.buf) {
1290 if (c->max_bu_buf_len > UBIFS_KMALLOC_OK) {
1291 c->max_bu_buf_len = UBIFS_KMALLOC_OK;
1292 goto again;
1293 }
1294
1295 /* Just disable bulk-read */
1296 ubifs_warn("cannot allocate %d bytes of memory for bulk-read, disabling it",
1297 c->max_bu_buf_len);
1298 c->mount_opts.bulk_read = 1;
1299 c->bulk_read = 0;
1300 return;
1301 }
1302}
1303
1304#ifndef __UBOOT__
1305/**
1306 * check_free_space - check if there is enough free space to mount.
1307 * @c: UBIFS file-system description object
1308 *
1309 * This function makes sure UBIFS has enough free space to be mounted in
1310 * read/write mode. UBIFS must always have some free space to allow deletions.
1311 */
1312static int check_free_space(struct ubifs_info *c)
1313{
1314 ubifs_assert(c->dark_wm > 0);
1315 if (c->lst.total_free + c->lst.total_dirty < c->dark_wm) {
1316 ubifs_err("insufficient free space to mount in R/W mode");
1317 ubifs_dump_budg(c, &c->bi);
1318 ubifs_dump_lprops(c);
1319 return -ENOSPC;
1320 }
1321 return 0;
1322}
1323#endif
1324
1325/**
Stefan Roese2fc10f62009-03-19 15:35:05 +01001326 * mount_ubifs - mount UBIFS file-system.
1327 * @c: UBIFS file-system description object
1328 *
1329 * This function mounts UBIFS file system. Returns zero in case of success and
1330 * a negative error code in case of failure.
Stefan Roese2fc10f62009-03-19 15:35:05 +01001331 */
1332static int mount_ubifs(struct ubifs_info *c)
1333{
Heiko Schocherf5895d12014-06-24 10:10:04 +02001334 int err;
1335 long long x, y;
Stefan Roese2fc10f62009-03-19 15:35:05 +01001336 size_t sz;
1337
Heiko Schocherf5895d12014-06-24 10:10:04 +02001338 c->ro_mount = !!(c->vfs_sb->s_flags & MS_RDONLY);
1339#ifdef __UBOOT__
1340 if (!c->ro_mount) {
1341 printf("UBIFS: only ro mode in U-Boot allowed.\n");
1342 return -EACCES;
1343 }
1344#endif
1345
Stefan Roese2fc10f62009-03-19 15:35:05 +01001346 err = init_constants_early(c);
1347 if (err)
1348 return err;
1349
1350 err = ubifs_debugging_init(c);
1351 if (err)
1352 return err;
1353
1354 err = check_volume_empty(c);
1355 if (err)
1356 goto out_free;
1357
Heiko Schocherf5895d12014-06-24 10:10:04 +02001358 if (c->empty && (c->ro_mount || c->ro_media)) {
Stefan Roese2fc10f62009-03-19 15:35:05 +01001359 /*
1360 * This UBI volume is empty, and read-only, or the file system
1361 * is mounted read-only - we cannot format it.
1362 */
1363 ubifs_err("can't format empty UBI volume: read-only %s",
1364 c->ro_media ? "UBI volume" : "mount");
1365 err = -EROFS;
1366 goto out_free;
1367 }
1368
Heiko Schocherf5895d12014-06-24 10:10:04 +02001369 if (c->ro_media && !c->ro_mount) {
Stefan Roese2fc10f62009-03-19 15:35:05 +01001370 ubifs_err("cannot mount read-write - read-only media");
1371 err = -EROFS;
1372 goto out_free;
1373 }
1374
1375 /*
1376 * The requirement for the buffer is that it should fit indexing B-tree
1377 * height amount of integers. We assume the height if the TNC tree will
1378 * never exceed 64.
1379 */
1380 err = -ENOMEM;
1381 c->bottom_up_buf = kmalloc(BOTTOM_UP_HEIGHT * sizeof(int), GFP_KERNEL);
1382 if (!c->bottom_up_buf)
1383 goto out_free;
1384
1385 c->sbuf = vmalloc(c->leb_size);
1386 if (!c->sbuf)
1387 goto out_free;
1388
Heiko Schocherf5895d12014-06-24 10:10:04 +02001389#ifndef __UBOOT__
1390 if (!c->ro_mount) {
1391 c->ileb_buf = vmalloc(c->leb_size);
1392 if (!c->ileb_buf)
1393 goto out_free;
1394 }
1395#endif
1396
1397 if (c->bulk_read == 1)
1398 bu_init(c);
1399
1400#ifndef __UBOOT__
1401 if (!c->ro_mount) {
1402 c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ,
1403 GFP_KERNEL);
1404 if (!c->write_reserve_buf)
1405 goto out_free;
1406 }
1407#endif
1408
1409 c->mounting = 1;
Stefan Roese2fc10f62009-03-19 15:35:05 +01001410
1411 err = ubifs_read_superblock(c);
1412 if (err)
1413 goto out_free;
1414
1415 /*
1416 * Make sure the compressor which is set as default in the superblock
1417 * or overridden by mount options is actually compiled in.
1418 */
1419 if (!ubifs_compr_present(c->default_compr)) {
1420 ubifs_err("'compressor \"%s\" is not compiled in",
1421 ubifs_compr_name(c->default_compr));
Heiko Schocherf5895d12014-06-24 10:10:04 +02001422 err = -ENOTSUPP;
Stefan Roese2fc10f62009-03-19 15:35:05 +01001423 goto out_free;
1424 }
1425
Stefan Roese2fc10f62009-03-19 15:35:05 +01001426 err = init_constants_sb(c);
1427 if (err)
1428 goto out_free;
1429
1430 sz = ALIGN(c->max_idx_node_sz, c->min_io_size);
1431 sz = ALIGN(sz + c->max_idx_node_sz, c->min_io_size);
1432 c->cbuf = kmalloc(sz, GFP_NOFS);
1433 if (!c->cbuf) {
1434 err = -ENOMEM;
1435 goto out_free;
1436 }
1437
Heiko Schocherf5895d12014-06-24 10:10:04 +02001438 err = alloc_wbufs(c);
1439 if (err)
1440 goto out_cbuf;
1441
Stefan Roese2fc10f62009-03-19 15:35:05 +01001442 sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id);
Heiko Schocherf5895d12014-06-24 10:10:04 +02001443#ifndef __UBOOT__
1444 if (!c->ro_mount) {
1445 /* Create background thread */
1446 c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name);
1447 if (IS_ERR(c->bgt)) {
1448 err = PTR_ERR(c->bgt);
1449 c->bgt = NULL;
1450 ubifs_err("cannot spawn \"%s\", error %d",
1451 c->bgt_name, err);
1452 goto out_wbufs;
1453 }
1454 wake_up_process(c->bgt);
1455 }
1456#endif
Stefan Roese2fc10f62009-03-19 15:35:05 +01001457
1458 err = ubifs_read_master(c);
1459 if (err)
1460 goto out_master;
1461
1462 init_constants_master(c);
1463
1464 if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) {
1465 ubifs_msg("recovery needed");
1466 c->need_recovery = 1;
1467 }
1468
Heiko Schocherf5895d12014-06-24 10:10:04 +02001469#ifndef __UBOOT__
1470 if (c->need_recovery && !c->ro_mount) {
1471 err = ubifs_recover_inl_heads(c, c->sbuf);
1472 if (err)
1473 goto out_master;
1474 }
1475#endif
1476
1477 err = ubifs_lpt_init(c, 1, !c->ro_mount);
Stefan Roese2fc10f62009-03-19 15:35:05 +01001478 if (err)
Heiko Schocherf5895d12014-06-24 10:10:04 +02001479 goto out_master;
1480
1481#ifndef __UBOOT__
1482 if (!c->ro_mount && c->space_fixup) {
1483 err = ubifs_fixup_free_space(c);
1484 if (err)
1485 goto out_lpt;
1486 }
1487
1488 if (!c->ro_mount) {
1489 /*
1490 * Set the "dirty" flag so that if we reboot uncleanly we
1491 * will notice this immediately on the next mount.
1492 */
1493 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY);
1494 err = ubifs_write_master(c);
1495 if (err)
1496 goto out_lpt;
1497 }
1498#endif
Stefan Roese2fc10f62009-03-19 15:35:05 +01001499
Heiko Schocherf5895d12014-06-24 10:10:04 +02001500 err = dbg_check_idx_size(c, c->bi.old_idx_sz);
Stefan Roese2fc10f62009-03-19 15:35:05 +01001501 if (err)
1502 goto out_lpt;
1503
1504 err = ubifs_replay_journal(c);
1505 if (err)
1506 goto out_journal;
1507
Heiko Schocherf5895d12014-06-24 10:10:04 +02001508 /* Calculate 'min_idx_lebs' after journal replay */
1509 c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c);
1510
1511 err = ubifs_mount_orphans(c, c->need_recovery, c->ro_mount);
Stefan Roese2fc10f62009-03-19 15:35:05 +01001512 if (err)
1513 goto out_orphans;
1514
Heiko Schocherf5895d12014-06-24 10:10:04 +02001515 if (!c->ro_mount) {
1516#ifndef __UBOOT__
1517 int lnum;
1518
1519 err = check_free_space(c);
1520 if (err)
1521 goto out_orphans;
1522
1523 /* Check for enough log space */
1524 lnum = c->lhead_lnum + 1;
1525 if (lnum >= UBIFS_LOG_LNUM + c->log_lebs)
1526 lnum = UBIFS_LOG_LNUM;
1527 if (lnum == c->ltail_lnum) {
1528 err = ubifs_consolidate_log(c);
1529 if (err)
1530 goto out_orphans;
1531 }
1532
1533 if (c->need_recovery) {
1534 err = ubifs_recover_size(c);
1535 if (err)
1536 goto out_orphans;
1537 err = ubifs_rcvry_gc_commit(c);
1538 if (err)
1539 goto out_orphans;
1540 } else {
1541 err = take_gc_lnum(c);
1542 if (err)
1543 goto out_orphans;
1544
1545 /*
1546 * GC LEB may contain garbage if there was an unclean
1547 * reboot, and it should be un-mapped.
1548 */
1549 err = ubifs_leb_unmap(c, c->gc_lnum);
1550 if (err)
1551 goto out_orphans;
1552 }
1553
1554 err = dbg_check_lprops(c);
1555 if (err)
1556 goto out_orphans;
1557#endif
1558 } else if (c->need_recovery) {
Stefan Roese2fc10f62009-03-19 15:35:05 +01001559 err = ubifs_recover_size(c);
1560 if (err)
1561 goto out_orphans;
Heiko Schocherf5895d12014-06-24 10:10:04 +02001562 } else {
1563 /*
1564 * Even if we mount read-only, we have to set space in GC LEB
1565 * to proper value because this affects UBIFS free space
1566 * reporting. We do not want to have a situation when
1567 * re-mounting from R/O to R/W changes amount of free space.
1568 */
1569 err = take_gc_lnum(c);
1570 if (err)
1571 goto out_orphans;
Stefan Roese2fc10f62009-03-19 15:35:05 +01001572 }
1573
Heiko Schocherf5895d12014-06-24 10:10:04 +02001574#ifndef __UBOOT__
Stefan Roese2fc10f62009-03-19 15:35:05 +01001575 spin_lock(&ubifs_infos_lock);
1576 list_add_tail(&c->infos_list, &ubifs_infos);
1577 spin_unlock(&ubifs_infos_lock);
Heiko Schocherf5895d12014-06-24 10:10:04 +02001578#endif
Stefan Roese2fc10f62009-03-19 15:35:05 +01001579
1580 if (c->need_recovery) {
Heiko Schocherf5895d12014-06-24 10:10:04 +02001581 if (c->ro_mount)
Stefan Roese2fc10f62009-03-19 15:35:05 +01001582 ubifs_msg("recovery deferred");
1583 else {
1584 c->need_recovery = 0;
1585 ubifs_msg("recovery completed");
Heiko Schocherf5895d12014-06-24 10:10:04 +02001586 /*
1587 * GC LEB has to be empty and taken at this point. But
1588 * the journal head LEBs may also be accounted as
1589 * "empty taken" if they are empty.
1590 */
1591 ubifs_assert(c->lst.taken_empty_lebs > 0);
Stefan Roese2fc10f62009-03-19 15:35:05 +01001592 }
Heiko Schocherf5895d12014-06-24 10:10:04 +02001593 } else
1594 ubifs_assert(c->lst.taken_empty_lebs > 0);
Stefan Roese2fc10f62009-03-19 15:35:05 +01001595
1596 err = dbg_check_filesystem(c);
1597 if (err)
1598 goto out_infos;
1599
Heiko Schocherf5895d12014-06-24 10:10:04 +02001600 err = dbg_debugfs_init_fs(c);
1601 if (err)
1602 goto out_infos;
1603
1604 c->mounting = 0;
Stefan Roese2fc10f62009-03-19 15:35:05 +01001605
Heiko Schocherf5895d12014-06-24 10:10:04 +02001606 ubifs_msg("mounted UBI device %d, volume %d, name \"%s\"%s",
1607 c->vi.ubi_num, c->vi.vol_id, c->vi.name,
1608 c->ro_mount ? ", R/O mode" : "");
Stefan Roese2fc10f62009-03-19 15:35:05 +01001609 x = (long long)c->main_lebs * c->leb_size;
Heiko Schocherf5895d12014-06-24 10:10:04 +02001610 y = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes;
1611 ubifs_msg("LEB size: %d bytes (%d KiB), min./max. I/O unit sizes: %d bytes/%d bytes",
1612 c->leb_size, c->leb_size >> 10, c->min_io_size,
1613 c->max_write_size);
1614 ubifs_msg("FS size: %lld bytes (%lld MiB, %d LEBs), journal size %lld bytes (%lld MiB, %d LEBs)",
1615 x, x >> 20, c->main_lebs,
1616 y, y >> 20, c->log_lebs + c->max_bud_cnt);
1617 ubifs_msg("reserved for root: %llu bytes (%llu KiB)",
1618 c->report_rp_size, c->report_rp_size >> 10);
1619 ubifs_msg("media format: w%d/r%d (latest is w%d/r%d), UUID %pUB%s",
Artem Bityutskiy619697a2009-03-27 10:21:14 +01001620 c->fmt_version, c->ro_compat_version,
Heiko Schocherf5895d12014-06-24 10:10:04 +02001621 UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION, c->uuid,
1622 c->big_lpt ? ", big LPT model" : ", small LPT model");
Stefan Roese2fc10f62009-03-19 15:35:05 +01001623
Heiko Schocherf5895d12014-06-24 10:10:04 +02001624 dbg_gen("default compressor: %s", ubifs_compr_name(c->default_compr));
1625 dbg_gen("data journal heads: %d",
Stefan Roese2fc10f62009-03-19 15:35:05 +01001626 c->jhead_cnt - NONDATA_JHEADS_CNT);
Heiko Schocherf5895d12014-06-24 10:10:04 +02001627 dbg_gen("log LEBs: %d (%d - %d)",
Stefan Roese2fc10f62009-03-19 15:35:05 +01001628 c->log_lebs, UBIFS_LOG_LNUM, c->log_last);
Heiko Schocherf5895d12014-06-24 10:10:04 +02001629 dbg_gen("LPT area LEBs: %d (%d - %d)",
Stefan Roese2fc10f62009-03-19 15:35:05 +01001630 c->lpt_lebs, c->lpt_first, c->lpt_last);
Heiko Schocherf5895d12014-06-24 10:10:04 +02001631 dbg_gen("orphan area LEBs: %d (%d - %d)",
Stefan Roese2fc10f62009-03-19 15:35:05 +01001632 c->orph_lebs, c->orph_first, c->orph_last);
Heiko Schocherf5895d12014-06-24 10:10:04 +02001633 dbg_gen("main area LEBs: %d (%d - %d)",
Stefan Roese2fc10f62009-03-19 15:35:05 +01001634 c->main_lebs, c->main_first, c->leb_cnt - 1);
Heiko Schocherf5895d12014-06-24 10:10:04 +02001635 dbg_gen("index LEBs: %d", c->lst.idx_lebs);
1636 dbg_gen("total index bytes: %lld (%lld KiB, %lld MiB)",
1637 c->bi.old_idx_sz, c->bi.old_idx_sz >> 10,
1638 c->bi.old_idx_sz >> 20);
1639 dbg_gen("key hash type: %d", c->key_hash_type);
1640 dbg_gen("tree fanout: %d", c->fanout);
1641 dbg_gen("reserved GC LEB: %d", c->gc_lnum);
1642 dbg_gen("max. znode size %d", c->max_znode_sz);
1643 dbg_gen("max. index node size %d", c->max_idx_node_sz);
1644 dbg_gen("node sizes: data %zu, inode %zu, dentry %zu",
Stefan Roese2fc10f62009-03-19 15:35:05 +01001645 UBIFS_DATA_NODE_SZ, UBIFS_INO_NODE_SZ, UBIFS_DENT_NODE_SZ);
Heiko Schocherf5895d12014-06-24 10:10:04 +02001646 dbg_gen("node sizes: trun %zu, sb %zu, master %zu",
Stefan Roese2fc10f62009-03-19 15:35:05 +01001647 UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ);
Heiko Schocherf5895d12014-06-24 10:10:04 +02001648 dbg_gen("node sizes: ref %zu, cmt. start %zu, orph %zu",
Stefan Roese2fc10f62009-03-19 15:35:05 +01001649 UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ);
Heiko Schocherf5895d12014-06-24 10:10:04 +02001650 dbg_gen("max. node sizes: data %zu, inode %zu dentry %zu, idx %d",
Wolfgang Denkec7fbf52013-10-04 17:43:24 +02001651 UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ,
Heiko Schocherf5895d12014-06-24 10:10:04 +02001652 UBIFS_MAX_DENT_NODE_SZ, ubifs_idx_node_sz(c, c->fanout));
1653 dbg_gen("dead watermark: %d", c->dead_wm);
1654 dbg_gen("dark watermark: %d", c->dark_wm);
1655 dbg_gen("LEB overhead: %d", c->leb_overhead);
Stefan Roese2fc10f62009-03-19 15:35:05 +01001656 x = (long long)c->main_lebs * c->dark_wm;
Heiko Schocherf5895d12014-06-24 10:10:04 +02001657 dbg_gen("max. dark space: %lld (%lld KiB, %lld MiB)",
Stefan Roese2fc10f62009-03-19 15:35:05 +01001658 x, x >> 10, x >> 20);
Heiko Schocherf5895d12014-06-24 10:10:04 +02001659 dbg_gen("maximum bud bytes: %lld (%lld KiB, %lld MiB)",
Stefan Roese2fc10f62009-03-19 15:35:05 +01001660 c->max_bud_bytes, c->max_bud_bytes >> 10,
1661 c->max_bud_bytes >> 20);
Heiko Schocherf5895d12014-06-24 10:10:04 +02001662 dbg_gen("BG commit bud bytes: %lld (%lld KiB, %lld MiB)",
Stefan Roese2fc10f62009-03-19 15:35:05 +01001663 c->bg_bud_bytes, c->bg_bud_bytes >> 10,
1664 c->bg_bud_bytes >> 20);
Heiko Schocherf5895d12014-06-24 10:10:04 +02001665 dbg_gen("current bud bytes %lld (%lld KiB, %lld MiB)",
Stefan Roese2fc10f62009-03-19 15:35:05 +01001666 c->bud_bytes, c->bud_bytes >> 10, c->bud_bytes >> 20);
Heiko Schocherf5895d12014-06-24 10:10:04 +02001667 dbg_gen("max. seq. number: %llu", c->max_sqnum);
1668 dbg_gen("commit number: %llu", c->cmt_no);
1669
1670 return 0;
1671
1672out_infos:
1673 spin_lock(&ubifs_infos_lock);
1674 list_del(&c->infos_list);
1675 spin_unlock(&ubifs_infos_lock);
1676out_orphans:
1677 free_orphans(c);
Heiko Schocherf5895d12014-06-24 10:10:04 +02001678out_journal:
1679 destroy_journal(c);
Heiko Schocherf5895d12014-06-24 10:10:04 +02001680out_lpt:
1681 ubifs_lpt_free(c, 0);
1682out_master:
1683 kfree(c->mst_node);
1684 kfree(c->rcvrd_mst_node);
1685 if (c->bgt)
1686 kthread_stop(c->bgt);
1687#ifndef __UBOOT__
1688out_wbufs:
1689#endif
1690 free_wbufs(c);
1691out_cbuf:
1692 kfree(c->cbuf);
1693out_free:
1694 kfree(c->write_reserve_buf);
1695 kfree(c->bu.buf);
1696 vfree(c->ileb_buf);
1697 vfree(c->sbuf);
1698 kfree(c->bottom_up_buf);
1699 ubifs_debugging_exit(c);
1700 return err;
1701}
1702
1703/**
1704 * ubifs_umount - un-mount UBIFS file-system.
1705 * @c: UBIFS file-system description object
1706 *
1707 * Note, this function is called to free allocated resourced when un-mounting,
1708 * as well as free resources when an error occurred while we were half way
1709 * through mounting (error path cleanup function). So it has to make sure the
1710 * resource was actually allocated before freeing it.
1711 */
1712#ifndef __UBOOT__
1713static void ubifs_umount(struct ubifs_info *c)
1714#else
1715void ubifs_umount(struct ubifs_info *c)
1716#endif
1717{
1718 dbg_gen("un-mounting UBI device %d, volume %d", c->vi.ubi_num,
1719 c->vi.vol_id);
1720
1721 dbg_debugfs_exit_fs(c);
1722 spin_lock(&ubifs_infos_lock);
1723 list_del(&c->infos_list);
1724 spin_unlock(&ubifs_infos_lock);
1725
1726#ifndef __UBOOT__
1727 if (c->bgt)
1728 kthread_stop(c->bgt);
1729
1730 destroy_journal(c);
1731#endif
1732 free_wbufs(c);
1733 free_orphans(c);
1734 ubifs_lpt_free(c, 0);
1735
1736 kfree(c->cbuf);
1737 kfree(c->rcvrd_mst_node);
1738 kfree(c->mst_node);
1739 kfree(c->write_reserve_buf);
1740 kfree(c->bu.buf);
1741 vfree(c->ileb_buf);
1742 vfree(c->sbuf);
1743 kfree(c->bottom_up_buf);
1744 ubifs_debugging_exit(c);
1745#ifdef __UBOOT__
1746 /* Finally free U-Boot's global copy of superblock */
1747 if (ubifs_sb != NULL) {
1748 free(ubifs_sb->s_fs_info);
1749 free(ubifs_sb);
1750 }
1751#endif
1752}
1753
1754#ifndef __UBOOT__
1755/**
1756 * ubifs_remount_rw - re-mount in read-write mode.
1757 * @c: UBIFS file-system description object
1758 *
1759 * UBIFS avoids allocating many unnecessary resources when mounted in read-only
1760 * mode. This function allocates the needed resources and re-mounts UBIFS in
1761 * read-write mode.
1762 */
1763static int ubifs_remount_rw(struct ubifs_info *c)
1764{
1765 int err, lnum;
1766
1767 if (c->rw_incompat) {
1768 ubifs_err("the file-system is not R/W-compatible");
1769 ubifs_msg("on-flash format version is w%d/r%d, but software only supports up to version w%d/r%d",
1770 c->fmt_version, c->ro_compat_version,
1771 UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION);
1772 return -EROFS;
1773 }
1774
1775 mutex_lock(&c->umount_mutex);
1776 dbg_save_space_info(c);
1777 c->remounting_rw = 1;
1778 c->ro_mount = 0;
1779
1780 if (c->space_fixup) {
1781 err = ubifs_fixup_free_space(c);
1782 if (err)
Heiko Schocher081fe9e2014-07-15 16:08:43 +02001783 goto out;
Heiko Schocherf5895d12014-06-24 10:10:04 +02001784 }
1785
1786 err = check_free_space(c);
1787 if (err)
1788 goto out;
1789
1790 if (c->old_leb_cnt != c->leb_cnt) {
1791 struct ubifs_sb_node *sup;
1792
1793 sup = ubifs_read_sb_node(c);
1794 if (IS_ERR(sup)) {
1795 err = PTR_ERR(sup);
1796 goto out;
1797 }
1798 sup->leb_cnt = cpu_to_le32(c->leb_cnt);
1799 err = ubifs_write_sb_node(c, sup);
1800 kfree(sup);
1801 if (err)
1802 goto out;
1803 }
1804
1805 if (c->need_recovery) {
1806 ubifs_msg("completing deferred recovery");
1807 err = ubifs_write_rcvrd_mst_node(c);
1808 if (err)
1809 goto out;
1810 err = ubifs_recover_size(c);
1811 if (err)
1812 goto out;
1813 err = ubifs_clean_lebs(c, c->sbuf);
1814 if (err)
1815 goto out;
1816 err = ubifs_recover_inl_heads(c, c->sbuf);
1817 if (err)
1818 goto out;
1819 } else {
1820 /* A readonly mount is not allowed to have orphans */
1821 ubifs_assert(c->tot_orphans == 0);
1822 err = ubifs_clear_orphans(c);
1823 if (err)
1824 goto out;
1825 }
1826
1827 if (!(c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY))) {
1828 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY);
1829 err = ubifs_write_master(c);
1830 if (err)
1831 goto out;
1832 }
1833
1834 c->ileb_buf = vmalloc(c->leb_size);
1835 if (!c->ileb_buf) {
1836 err = -ENOMEM;
1837 goto out;
1838 }
1839
1840 c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ, GFP_KERNEL);
1841 if (!c->write_reserve_buf) {
1842 err = -ENOMEM;
1843 goto out;
1844 }
1845
1846 err = ubifs_lpt_init(c, 0, 1);
1847 if (err)
1848 goto out;
1849
1850 /* Create background thread */
1851 c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name);
1852 if (IS_ERR(c->bgt)) {
1853 err = PTR_ERR(c->bgt);
1854 c->bgt = NULL;
1855 ubifs_err("cannot spawn \"%s\", error %d",
1856 c->bgt_name, err);
1857 goto out;
1858 }
1859 wake_up_process(c->bgt);
1860
1861 c->orph_buf = vmalloc(c->leb_size);
1862 if (!c->orph_buf) {
1863 err = -ENOMEM;
1864 goto out;
1865 }
1866
1867 /* Check for enough log space */
1868 lnum = c->lhead_lnum + 1;
1869 if (lnum >= UBIFS_LOG_LNUM + c->log_lebs)
1870 lnum = UBIFS_LOG_LNUM;
1871 if (lnum == c->ltail_lnum) {
1872 err = ubifs_consolidate_log(c);
1873 if (err)
1874 goto out;
1875 }
Stefan Roese2fc10f62009-03-19 15:35:05 +01001876
Heiko Schocherf5895d12014-06-24 10:10:04 +02001877 if (c->need_recovery)
1878 err = ubifs_rcvry_gc_commit(c);
1879 else
1880 err = ubifs_leb_unmap(c, c->gc_lnum);
1881 if (err)
1882 goto out;
Stefan Roese2fc10f62009-03-19 15:35:05 +01001883
Heiko Schocherf5895d12014-06-24 10:10:04 +02001884 dbg_gen("re-mounted read-write");
1885 c->remounting_rw = 0;
1886
1887 if (c->need_recovery) {
1888 c->need_recovery = 0;
1889 ubifs_msg("deferred recovery completed");
1890 } else {
1891 /*
1892 * Do not run the debugging space check if the were doing
1893 * recovery, because when we saved the information we had the
1894 * file-system in a state where the TNC and lprops has been
1895 * modified in memory, but all the I/O operations (including a
1896 * commit) were deferred. So the file-system was in
1897 * "non-committed" state. Now the file-system is in committed
1898 * state, and of course the amount of free space will change
1899 * because, for example, the old index size was imprecise.
1900 */
1901 err = dbg_check_space_info(c);
1902 }
1903
1904 mutex_unlock(&c->umount_mutex);
1905 return err;
1906
1907out:
1908 c->ro_mount = 1;
1909 vfree(c->orph_buf);
1910 c->orph_buf = NULL;
1911 if (c->bgt) {
Stefan Roese2fc10f62009-03-19 15:35:05 +01001912 kthread_stop(c->bgt);
Heiko Schocherf5895d12014-06-24 10:10:04 +02001913 c->bgt = NULL;
1914 }
1915 free_wbufs(c);
1916 kfree(c->write_reserve_buf);
1917 c->write_reserve_buf = NULL;
Stefan Roese2fc10f62009-03-19 15:35:05 +01001918 vfree(c->ileb_buf);
Heiko Schocherf5895d12014-06-24 10:10:04 +02001919 c->ileb_buf = NULL;
1920 ubifs_lpt_free(c, 1);
1921 c->remounting_rw = 0;
1922 mutex_unlock(&c->umount_mutex);
Stefan Roese2fc10f62009-03-19 15:35:05 +01001923 return err;
1924}
1925
1926/**
Heiko Schocherf5895d12014-06-24 10:10:04 +02001927 * ubifs_remount_ro - re-mount in read-only mode.
Stefan Roese2fc10f62009-03-19 15:35:05 +01001928 * @c: UBIFS file-system description object
1929 *
Heiko Schocherf5895d12014-06-24 10:10:04 +02001930 * We assume VFS has stopped writing. Possibly the background thread could be
1931 * running a commit, however kthread_stop will wait in that case.
Stefan Roese2fc10f62009-03-19 15:35:05 +01001932 */
Heiko Schocherf5895d12014-06-24 10:10:04 +02001933static void ubifs_remount_ro(struct ubifs_info *c)
Stefan Roese2fc10f62009-03-19 15:35:05 +01001934{
Heiko Schocherf5895d12014-06-24 10:10:04 +02001935 int i, err;
Stefan Roese2fc10f62009-03-19 15:35:05 +01001936
Heiko Schocherf5895d12014-06-24 10:10:04 +02001937 ubifs_assert(!c->need_recovery);
1938 ubifs_assert(!c->ro_mount);
Stefan Roese2fc10f62009-03-19 15:35:05 +01001939
Heiko Schocherf5895d12014-06-24 10:10:04 +02001940 mutex_lock(&c->umount_mutex);
1941 if (c->bgt) {
Stefan Roese2fc10f62009-03-19 15:35:05 +01001942 kthread_stop(c->bgt);
Heiko Schocherf5895d12014-06-24 10:10:04 +02001943 c->bgt = NULL;
1944 }
Stefan Roese2fc10f62009-03-19 15:35:05 +01001945
Heiko Schocherf5895d12014-06-24 10:10:04 +02001946 dbg_save_space_info(c);
Stefan Roese2fc10f62009-03-19 15:35:05 +01001947
Heiko Schocherf5895d12014-06-24 10:10:04 +02001948 for (i = 0; i < c->jhead_cnt; i++)
1949 ubifs_wbuf_sync(&c->jheads[i].wbuf);
1950
1951 c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
1952 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
1953 c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum);
1954 err = ubifs_write_master(c);
1955 if (err)
1956 ubifs_ro_mode(c, err);
1957
1958 vfree(c->orph_buf);
1959 c->orph_buf = NULL;
1960 kfree(c->write_reserve_buf);
1961 c->write_reserve_buf = NULL;
Stefan Roese2fc10f62009-03-19 15:35:05 +01001962 vfree(c->ileb_buf);
Heiko Schocherf5895d12014-06-24 10:10:04 +02001963 c->ileb_buf = NULL;
1964 ubifs_lpt_free(c, 1);
1965 c->ro_mount = 1;
1966 err = dbg_check_space_info(c);
1967 if (err)
1968 ubifs_ro_mode(c, err);
1969 mutex_unlock(&c->umount_mutex);
1970}
Stefan Roese2fc10f62009-03-19 15:35:05 +01001971
Heiko Schocherf5895d12014-06-24 10:10:04 +02001972static void ubifs_put_super(struct super_block *sb)
1973{
1974 int i;
1975 struct ubifs_info *c = sb->s_fs_info;
1976
1977 ubifs_msg("un-mount UBI device %d, volume %d", c->vi.ubi_num,
1978 c->vi.vol_id);
1979
1980 /*
1981 * The following asserts are only valid if there has not been a failure
1982 * of the media. For example, there will be dirty inodes if we failed
1983 * to write them back because of I/O errors.
1984 */
1985 if (!c->ro_error) {
1986 ubifs_assert(c->bi.idx_growth == 0);
1987 ubifs_assert(c->bi.dd_growth == 0);
1988 ubifs_assert(c->bi.data_growth == 0);
1989 }
1990
1991 /*
1992 * The 'c->umount_lock' prevents races between UBIFS memory shrinker
1993 * and file system un-mount. Namely, it prevents the shrinker from
1994 * picking this superblock for shrinking - it will be just skipped if
1995 * the mutex is locked.
1996 */
1997 mutex_lock(&c->umount_mutex);
1998 if (!c->ro_mount) {
1999 /*
2000 * First of all kill the background thread to make sure it does
2001 * not interfere with un-mounting and freeing resources.
2002 */
2003 if (c->bgt) {
2004 kthread_stop(c->bgt);
2005 c->bgt = NULL;
2006 }
2007
2008 /*
2009 * On fatal errors c->ro_error is set to 1, in which case we do
2010 * not write the master node.
2011 */
2012 if (!c->ro_error) {
2013 int err;
2014
2015 /* Synchronize write-buffers */
2016 for (i = 0; i < c->jhead_cnt; i++)
2017 ubifs_wbuf_sync(&c->jheads[i].wbuf);
2018
2019 /*
2020 * We are being cleanly unmounted which means the
2021 * orphans were killed - indicate this in the master
2022 * node. Also save the reserved GC LEB number.
2023 */
2024 c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
2025 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
2026 c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum);
2027 err = ubifs_write_master(c);
2028 if (err)
2029 /*
2030 * Recovery will attempt to fix the master area
2031 * next mount, so we just print a message and
2032 * continue to unmount normally.
2033 */
2034 ubifs_err("failed to write master node, error %d",
2035 err);
2036 } else {
2037#ifndef __UBOOT__
2038 for (i = 0; i < c->jhead_cnt; i++)
2039 /* Make sure write-buffer timers are canceled */
2040 hrtimer_cancel(&c->jheads[i].wbuf.timer);
2041#endif
2042 }
2043 }
2044
2045 ubifs_umount(c);
2046#ifndef __UBOOT__
2047 bdi_destroy(&c->bdi);
2048#endif
2049 ubi_close_volume(c->ubi);
2050 mutex_unlock(&c->umount_mutex);
2051}
2052#endif
2053
2054#ifndef __UBOOT__
2055static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data)
2056{
2057 int err;
2058 struct ubifs_info *c = sb->s_fs_info;
2059
Heiko Schocher081fe9e2014-07-15 16:08:43 +02002060 sync_filesystem(sb);
Heiko Schocherf5895d12014-06-24 10:10:04 +02002061 dbg_gen("old flags %#lx, new flags %#x", sb->s_flags, *flags);
2062
2063 err = ubifs_parse_options(c, data, 1);
2064 if (err) {
2065 ubifs_err("invalid or unknown remount parameter");
2066 return err;
2067 }
2068
2069 if (c->ro_mount && !(*flags & MS_RDONLY)) {
2070 if (c->ro_error) {
2071 ubifs_msg("cannot re-mount R/W due to prior errors");
2072 return -EROFS;
2073 }
2074 if (c->ro_media) {
2075 ubifs_msg("cannot re-mount R/W - UBI volume is R/O");
2076 return -EROFS;
2077 }
2078 err = ubifs_remount_rw(c);
2079 if (err)
2080 return err;
2081 } else if (!c->ro_mount && (*flags & MS_RDONLY)) {
2082 if (c->ro_error) {
2083 ubifs_msg("cannot re-mount R/O due to prior errors");
2084 return -EROFS;
2085 }
2086 ubifs_remount_ro(c);
Lars Poeschel384b1fb2011-10-12 11:31:19 +02002087 }
Heiko Schocherf5895d12014-06-24 10:10:04 +02002088
2089 if (c->bulk_read == 1)
2090 bu_init(c);
2091 else {
2092 dbg_gen("disable bulk-read");
2093 kfree(c->bu.buf);
2094 c->bu.buf = NULL;
2095 }
2096
2097 ubifs_assert(c->lst.taken_empty_lebs > 0);
2098 return 0;
Stefan Roese2fc10f62009-03-19 15:35:05 +01002099}
Heiko Schocherf5895d12014-06-24 10:10:04 +02002100#endif
2101
2102const struct super_operations ubifs_super_operations = {
2103 .alloc_inode = ubifs_alloc_inode,
2104#ifndef __UBOOT__
2105 .destroy_inode = ubifs_destroy_inode,
2106 .put_super = ubifs_put_super,
2107 .write_inode = ubifs_write_inode,
2108 .evict_inode = ubifs_evict_inode,
2109 .statfs = ubifs_statfs,
2110#endif
2111 .dirty_inode = ubifs_dirty_inode,
2112#ifndef __UBOOT__
2113 .remount_fs = ubifs_remount_fs,
2114 .show_options = ubifs_show_options,
2115 .sync_fs = ubifs_sync_fs,
2116#endif
2117};
Stefan Roese2fc10f62009-03-19 15:35:05 +01002118
2119/**
2120 * open_ubi - parse UBI device name string and open the UBI device.
2121 * @name: UBI volume name
2122 * @mode: UBI volume open mode
2123 *
Heiko Schocherf5895d12014-06-24 10:10:04 +02002124 * The primary method of mounting UBIFS is by specifying the UBI volume
2125 * character device node path. However, UBIFS may also be mounted withoug any
2126 * character device node using one of the following methods:
2127 *
2128 * o ubiX_Y - mount UBI device number X, volume Y;
2129 * o ubiY - mount UBI device number 0, volume Y;
Stefan Roese2fc10f62009-03-19 15:35:05 +01002130 * o ubiX:NAME - mount UBI device X, volume with name NAME;
2131 * o ubi:NAME - mount UBI device 0, volume with name NAME.
2132 *
2133 * Alternative '!' separator may be used instead of ':' (because some shells
2134 * like busybox may interpret ':' as an NFS host name separator). This function
Heiko Schocherf5895d12014-06-24 10:10:04 +02002135 * returns UBI volume description object in case of success and a negative
2136 * error code in case of failure.
Stefan Roese2fc10f62009-03-19 15:35:05 +01002137 */
2138static struct ubi_volume_desc *open_ubi(const char *name, int mode)
2139{
Heiko Schocherf5895d12014-06-24 10:10:04 +02002140#ifndef __UBOOT__
2141 struct ubi_volume_desc *ubi;
2142#endif
Stefan Roese2fc10f62009-03-19 15:35:05 +01002143 int dev, vol;
2144 char *endptr;
2145
Heiko Schocherf5895d12014-06-24 10:10:04 +02002146#ifndef __UBOOT__
2147 /* First, try to open using the device node path method */
2148 ubi = ubi_open_volume_path(name, mode);
2149 if (!IS_ERR(ubi))
2150 return ubi;
2151#endif
2152
2153 /* Try the "nodev" method */
Stefan Roese2fc10f62009-03-19 15:35:05 +01002154 if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i')
2155 return ERR_PTR(-EINVAL);
2156
2157 /* ubi:NAME method */
2158 if ((name[3] == ':' || name[3] == '!') && name[4] != '\0')
2159 return ubi_open_volume_nm(0, name + 4, mode);
2160
2161 if (!isdigit(name[3]))
2162 return ERR_PTR(-EINVAL);
2163
2164 dev = simple_strtoul(name + 3, &endptr, 0);
2165
2166 /* ubiY method */
2167 if (*endptr == '\0')
2168 return ubi_open_volume(0, dev, mode);
2169
2170 /* ubiX_Y method */
2171 if (*endptr == '_' && isdigit(endptr[1])) {
2172 vol = simple_strtoul(endptr + 1, &endptr, 0);
2173 if (*endptr != '\0')
2174 return ERR_PTR(-EINVAL);
2175 return ubi_open_volume(dev, vol, mode);
2176 }
2177
2178 /* ubiX:NAME method */
2179 if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0')
2180 return ubi_open_volume_nm(dev, ++endptr, mode);
2181
2182 return ERR_PTR(-EINVAL);
2183}
2184
Heiko Schocherf5895d12014-06-24 10:10:04 +02002185static struct ubifs_info *alloc_ubifs_info(struct ubi_volume_desc *ubi)
Stefan Roese2fc10f62009-03-19 15:35:05 +01002186{
Stefan Roese2fc10f62009-03-19 15:35:05 +01002187 struct ubifs_info *c;
Stefan Roese2fc10f62009-03-19 15:35:05 +01002188
2189 c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL);
Heiko Schocherf5895d12014-06-24 10:10:04 +02002190 if (c) {
2191 spin_lock_init(&c->cnt_lock);
2192 spin_lock_init(&c->cs_lock);
2193 spin_lock_init(&c->buds_lock);
2194 spin_lock_init(&c->space_lock);
2195 spin_lock_init(&c->orphan_lock);
2196 init_rwsem(&c->commit_sem);
2197 mutex_init(&c->lp_mutex);
2198 mutex_init(&c->tnc_mutex);
2199 mutex_init(&c->log_mutex);
2200 mutex_init(&c->mst_mutex);
2201 mutex_init(&c->umount_mutex);
2202 mutex_init(&c->bu_mutex);
2203 mutex_init(&c->write_reserve_mutex);
2204 init_waitqueue_head(&c->cmt_wq);
2205 c->buds = RB_ROOT;
2206 c->old_idx = RB_ROOT;
2207 c->size_tree = RB_ROOT;
2208 c->orph_tree = RB_ROOT;
2209 INIT_LIST_HEAD(&c->infos_list);
2210 INIT_LIST_HEAD(&c->idx_gc);
2211 INIT_LIST_HEAD(&c->replay_list);
2212 INIT_LIST_HEAD(&c->replay_buds);
2213 INIT_LIST_HEAD(&c->uncat_list);
2214 INIT_LIST_HEAD(&c->empty_list);
2215 INIT_LIST_HEAD(&c->freeable_list);
2216 INIT_LIST_HEAD(&c->frdi_idx_list);
2217 INIT_LIST_HEAD(&c->unclean_leb_list);
2218 INIT_LIST_HEAD(&c->old_buds);
2219 INIT_LIST_HEAD(&c->orph_list);
2220 INIT_LIST_HEAD(&c->orph_new);
2221 c->no_chk_data_crc = 1;
Stefan Roese2fc10f62009-03-19 15:35:05 +01002222
Heiko Schocherf5895d12014-06-24 10:10:04 +02002223 c->highest_inum = UBIFS_FIRST_INO;
2224 c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM;
Stefan Roese2fc10f62009-03-19 15:35:05 +01002225
Heiko Schocherf5895d12014-06-24 10:10:04 +02002226 ubi_get_volume_info(ubi, &c->vi);
2227 ubi_get_device_info(c->vi.ubi_num, &c->di);
2228 }
2229 return c;
2230}
Stefan Roese2fc10f62009-03-19 15:35:05 +01002231
Heiko Schocherf5895d12014-06-24 10:10:04 +02002232static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
2233{
2234 struct ubifs_info *c = sb->s_fs_info;
2235 struct inode *root;
2236 int err;
Stefan Roese2fc10f62009-03-19 15:35:05 +01002237
Heiko Schocherf5895d12014-06-24 10:10:04 +02002238 c->vfs_sb = sb;
Heiko Schocherb24c4272014-07-15 16:08:42 +02002239#ifndef __UBOOT__
Stefan Roese2fc10f62009-03-19 15:35:05 +01002240 /* Re-open the UBI device in read-write mode */
Heiko Schocherf5895d12014-06-24 10:10:04 +02002241 c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READWRITE);
Heiko Schocherb24c4272014-07-15 16:08:42 +02002242#else
2243 /* U-Boot read only mode */
2244 c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READONLY);
2245#endif
2246
Stefan Roese2fc10f62009-03-19 15:35:05 +01002247 if (IS_ERR(c->ubi)) {
2248 err = PTR_ERR(c->ubi);
Heiko Schocherf5895d12014-06-24 10:10:04 +02002249 goto out;
Stefan Roese2fc10f62009-03-19 15:35:05 +01002250 }
2251
Heiko Schocherf5895d12014-06-24 10:10:04 +02002252#ifndef __UBOOT__
2253 /*
2254 * UBIFS provides 'backing_dev_info' in order to disable read-ahead. For
2255 * UBIFS, I/O is not deferred, it is done immediately in readpage,
2256 * which means the user would have to wait not just for their own I/O
2257 * but the read-ahead I/O as well i.e. completely pointless.
2258 *
2259 * Read-ahead will be disabled because @c->bdi.ra_pages is 0.
2260 */
2261 co>bdi.name = "ubifs",
2262 c->bdi.capabilities = BDI_CAP_MAP_COPY;
2263 err = bdi_init(&c->bdi);
2264 if (err)
2265 goto out_close;
2266 err = bdi_register(&c->bdi, NULL, "ubifs_%d_%d",
2267 c->vi.ubi_num, c->vi.vol_id);
2268 if (err)
2269 goto out_bdi;
2270
2271 err = ubifs_parse_options(c, data, 0);
2272 if (err)
2273 goto out_bdi;
Stefan Roese2fc10f62009-03-19 15:35:05 +01002274
Heiko Schocherf5895d12014-06-24 10:10:04 +02002275 sb->s_bdi = &c->bdi;
2276#endif
Stefan Roese2fc10f62009-03-19 15:35:05 +01002277 sb->s_fs_info = c;
2278 sb->s_magic = UBIFS_SUPER_MAGIC;
2279 sb->s_blocksize = UBIFS_BLOCK_SIZE;
2280 sb->s_blocksize_bits = UBIFS_BLOCK_SHIFT;
Stefan Roese2fc10f62009-03-19 15:35:05 +01002281 sb->s_maxbytes = c->max_inode_sz = key_max_inode_size(c);
2282 if (c->max_inode_sz > MAX_LFS_FILESIZE)
2283 sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE;
Heiko Schocherf5895d12014-06-24 10:10:04 +02002284 sb->s_op = &ubifs_super_operations;
Artem Bityutskiy619697a2009-03-27 10:21:14 +01002285
Stefan Roese2fc10f62009-03-19 15:35:05 +01002286 mutex_lock(&c->umount_mutex);
2287 err = mount_ubifs(c);
2288 if (err) {
2289 ubifs_assert(err < 0);
2290 goto out_unlock;
2291 }
2292
2293 /* Read the root inode */
2294 root = ubifs_iget(sb, UBIFS_ROOT_INO);
2295 if (IS_ERR(root)) {
2296 err = PTR_ERR(root);
2297 goto out_umount;
2298 }
2299
Heiko Schocherf5895d12014-06-24 10:10:04 +02002300#ifndef __UBOOT__
2301 sb->s_root = d_make_root(root);
2302 if (!sb->s_root) {
2303 err = -ENOMEM;
2304 goto out_umount;
2305 }
2306#else
Stefan Roese2fc10f62009-03-19 15:35:05 +01002307 sb->s_root = NULL;
Heiko Schocherf5895d12014-06-24 10:10:04 +02002308#endif
Stefan Roese2fc10f62009-03-19 15:35:05 +01002309
2310 mutex_unlock(&c->umount_mutex);
2311 return 0;
2312
2313out_umount:
2314 ubifs_umount(c);
2315out_unlock:
2316 mutex_unlock(&c->umount_mutex);
Heiko Schocherf5895d12014-06-24 10:10:04 +02002317#ifndef __UBOOT__
2318out_bdi:
2319 bdi_destroy(&c->bdi);
2320out_close:
2321#endif
Stefan Roese2fc10f62009-03-19 15:35:05 +01002322 ubi_close_volume(c->ubi);
Heiko Schocherf5895d12014-06-24 10:10:04 +02002323out:
Stefan Roese2fc10f62009-03-19 15:35:05 +01002324 return err;
2325}
2326
2327static int sb_test(struct super_block *sb, void *data)
2328{
Heiko Schocherf5895d12014-06-24 10:10:04 +02002329 struct ubifs_info *c1 = data;
2330 struct ubifs_info *c = sb->s_fs_info;
2331
2332 return c->vi.cdev == c1->vi.cdev;
2333}
2334
2335static int sb_set(struct super_block *sb, void *data)
2336{
2337 sb->s_fs_info = data;
2338 return set_anon_super(sb, NULL);
2339}
2340
2341static struct super_block *alloc_super(struct file_system_type *type, int flags)
2342{
2343 struct super_block *s;
2344 int err;
2345
2346 s = kzalloc(sizeof(struct super_block), GFP_USER);
2347 if (!s) {
2348 err = -ENOMEM;
2349 return ERR_PTR(err);
2350 }
2351
2352 INIT_HLIST_NODE(&s->s_instances);
2353 INIT_LIST_HEAD(&s->s_inodes);
2354 s->s_time_gran = 1000000000;
2355 s->s_flags = flags;
2356
2357 return s;
2358}
2359
2360/**
2361 * sget - find or create a superblock
2362 * @type: filesystem type superblock should belong to
2363 * @test: comparison callback
2364 * @set: setup callback
2365 * @flags: mount flags
2366 * @data: argument to each of them
2367 */
2368struct super_block *sget(struct file_system_type *type,
2369 int (*test)(struct super_block *,void *),
2370 int (*set)(struct super_block *,void *),
2371 int flags,
2372 void *data)
2373{
2374 struct super_block *s = NULL;
2375#ifndef __UBOOT__
2376 struct super_block *old;
2377#endif
2378 int err;
Stefan Roese2fc10f62009-03-19 15:35:05 +01002379
Heiko Schocherf5895d12014-06-24 10:10:04 +02002380#ifndef __UBOOT__
2381retry:
2382 spin_lock(&sb_lock);
2383 if (test) {
2384 hlist_for_each_entry(old, &type->fs_supers, s_instances) {
2385 if (!test(old, data))
2386 continue;
2387 if (!grab_super(old))
2388 goto retry;
2389 if (s) {
2390 up_write(&s->s_umount);
2391 destroy_super(s);
2392 s = NULL;
2393 }
2394 return old;
2395 }
2396 }
2397#endif
2398 if (!s) {
2399 spin_unlock(&sb_lock);
2400 s = alloc_super(type, flags);
2401 if (!s)
2402 return ERR_PTR(-ENOMEM);
2403#ifndef __UBOOT__
2404 goto retry;
2405#endif
2406 }
2407
2408 err = set(s, data);
2409 if (err) {
2410#ifndef __UBOOT__
2411 spin_unlock(&sb_lock);
2412 up_write(&s->s_umount);
2413 destroy_super(s);
2414#endif
2415 return ERR_PTR(err);
2416 }
2417 s->s_type = type;
2418#ifndef __UBOOT__
2419 strlcpy(s->s_id, type->name, sizeof(s->s_id));
2420#else
2421 strncpy(s->s_id, type->name, sizeof(s->s_id));
2422#endif
2423 list_add_tail(&s->s_list, &super_blocks);
2424 hlist_add_head(&s->s_instances, &type->fs_supers);
2425#ifndef __UBOOT__
2426 spin_unlock(&sb_lock);
2427 get_filesystem(type);
2428 register_shrinker(&s->s_shrink);
2429#endif
2430 return s;
Stefan Roese2fc10f62009-03-19 15:35:05 +01002431}
2432
Heiko Schocherf5895d12014-06-24 10:10:04 +02002433EXPORT_SYMBOL(sget);
2434
2435
2436static struct dentry *ubifs_mount(struct file_system_type *fs_type, int flags,
2437 const char *name, void *data)
Stefan Roese2fc10f62009-03-19 15:35:05 +01002438{
2439 struct ubi_volume_desc *ubi;
Heiko Schocherf5895d12014-06-24 10:10:04 +02002440 struct ubifs_info *c;
Stefan Roese2fc10f62009-03-19 15:35:05 +01002441 struct super_block *sb;
2442 int err;
2443
2444 dbg_gen("name %s, flags %#x", name, flags);
2445
2446 /*
2447 * Get UBI device number and volume ID. Mount it read-only so far
2448 * because this might be a new mount point, and UBI allows only one
2449 * read-write user at a time.
2450 */
2451 ubi = open_ubi(name, UBI_READONLY);
2452 if (IS_ERR(ubi)) {
2453 ubifs_err("cannot open \"%s\", error %d",
2454 name, (int)PTR_ERR(ubi));
Heiko Schocherf5895d12014-06-24 10:10:04 +02002455 return ERR_CAST(ubi);
2456 }
2457
2458 c = alloc_ubifs_info(ubi);
2459 if (!c) {
2460 err = -ENOMEM;
2461 goto out_close;
Stefan Roese2fc10f62009-03-19 15:35:05 +01002462 }
Stefan Roese2fc10f62009-03-19 15:35:05 +01002463
Heiko Schocherf5895d12014-06-24 10:10:04 +02002464 dbg_gen("opened ubi%d_%d", c->vi.ubi_num, c->vi.vol_id);
Stefan Roese2fc10f62009-03-19 15:35:05 +01002465
Heiko Schocherf5895d12014-06-24 10:10:04 +02002466 sb = sget(fs_type, sb_test, sb_set, flags, c);
Stefan Roese2fc10f62009-03-19 15:35:05 +01002467 if (IS_ERR(sb)) {
2468 err = PTR_ERR(sb);
Heiko Schocherf5895d12014-06-24 10:10:04 +02002469 kfree(c);
Stefan Roese2fc10f62009-03-19 15:35:05 +01002470 goto out_close;
2471 }
2472
2473 if (sb->s_root) {
Heiko Schocherf5895d12014-06-24 10:10:04 +02002474 struct ubifs_info *c1 = sb->s_fs_info;
2475 kfree(c);
Stefan Roese2fc10f62009-03-19 15:35:05 +01002476 /* A new mount point for already mounted UBIFS */
2477 dbg_gen("this ubi volume is already mounted");
Heiko Schocherf5895d12014-06-24 10:10:04 +02002478 if (!!(flags & MS_RDONLY) != c1->ro_mount) {
Stefan Roese2fc10f62009-03-19 15:35:05 +01002479 err = -EBUSY;
2480 goto out_deact;
2481 }
2482 } else {
Stefan Roese2fc10f62009-03-19 15:35:05 +01002483 err = ubifs_fill_super(sb, data, flags & MS_SILENT ? 1 : 0);
2484 if (err)
2485 goto out_deact;
2486 /* We do not support atime */
2487 sb->s_flags |= MS_ACTIVE | MS_NOATIME;
2488 }
2489
2490 /* 'fill_super()' opens ubi again so we must close it here */
2491 ubi_close_volume(ubi);
2492
Heiko Schocherf5895d12014-06-24 10:10:04 +02002493#ifdef __UBOOT__
Stefan Roese2fc10f62009-03-19 15:35:05 +01002494 ubifs_sb = sb;
2495 return 0;
Heiko Schocherf5895d12014-06-24 10:10:04 +02002496#else
2497 return dget(sb->s_root);
2498#endif
Stefan Roese2fc10f62009-03-19 15:35:05 +01002499
2500out_deact:
Heiko Schocherf5895d12014-06-24 10:10:04 +02002501#ifndef __UBOOT__
2502 deactivate_locked_super(sb);
2503#endif
Stefan Roese2fc10f62009-03-19 15:35:05 +01002504out_close:
2505 ubi_close_volume(ubi);
Heiko Schocherf5895d12014-06-24 10:10:04 +02002506 return ERR_PTR(err);
2507}
2508
2509static void kill_ubifs_super(struct super_block *s)
2510{
2511 struct ubifs_info *c = s->s_fs_info;
2512#ifndef __UBOOT__
2513 kill_anon_super(s);
2514#endif
2515 kfree(c);
Stefan Roese2fc10f62009-03-19 15:35:05 +01002516}
2517
Heiko Schocherf5895d12014-06-24 10:10:04 +02002518static struct file_system_type ubifs_fs_type = {
2519 .name = "ubifs",
2520 .owner = THIS_MODULE,
2521 .mount = ubifs_mount,
2522 .kill_sb = kill_ubifs_super,
2523};
2524#ifndef __UBOOT__
2525MODULE_ALIAS_FS("ubifs");
2526
2527/*
2528 * Inode slab cache constructor.
2529 */
2530static void inode_slab_ctor(void *obj)
2531{
2532 struct ubifs_inode *ui = obj;
2533 inode_init_once(&ui->vfs_inode);
2534}
2535
2536static int __init ubifs_init(void)
2537#else
2538int ubifs_init(void)
2539#endif
Stefan Roese2fc10f62009-03-19 15:35:05 +01002540{
2541 int err;
2542
2543 BUILD_BUG_ON(sizeof(struct ubifs_ch) != 24);
2544
2545 /* Make sure node sizes are 8-byte aligned */
2546 BUILD_BUG_ON(UBIFS_CH_SZ & 7);
2547 BUILD_BUG_ON(UBIFS_INO_NODE_SZ & 7);
2548 BUILD_BUG_ON(UBIFS_DENT_NODE_SZ & 7);
2549 BUILD_BUG_ON(UBIFS_XENT_NODE_SZ & 7);
2550 BUILD_BUG_ON(UBIFS_DATA_NODE_SZ & 7);
2551 BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ & 7);
2552 BUILD_BUG_ON(UBIFS_SB_NODE_SZ & 7);
2553 BUILD_BUG_ON(UBIFS_MST_NODE_SZ & 7);
2554 BUILD_BUG_ON(UBIFS_REF_NODE_SZ & 7);
2555 BUILD_BUG_ON(UBIFS_CS_NODE_SZ & 7);
2556 BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ & 7);
2557
2558 BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ & 7);
2559 BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ & 7);
2560 BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ & 7);
2561 BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ & 7);
2562 BUILD_BUG_ON(UBIFS_MAX_NODE_SZ & 7);
2563 BUILD_BUG_ON(MIN_WRITE_SZ & 7);
2564
2565 /* Check min. node size */
2566 BUILD_BUG_ON(UBIFS_INO_NODE_SZ < MIN_WRITE_SZ);
2567 BUILD_BUG_ON(UBIFS_DENT_NODE_SZ < MIN_WRITE_SZ);
2568 BUILD_BUG_ON(UBIFS_XENT_NODE_SZ < MIN_WRITE_SZ);
2569 BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ < MIN_WRITE_SZ);
2570
2571 BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
2572 BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
2573 BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ > UBIFS_MAX_NODE_SZ);
2574 BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ > UBIFS_MAX_NODE_SZ);
2575
2576 /* Defined node sizes */
2577 BUILD_BUG_ON(UBIFS_SB_NODE_SZ != 4096);
2578 BUILD_BUG_ON(UBIFS_MST_NODE_SZ != 512);
2579 BUILD_BUG_ON(UBIFS_INO_NODE_SZ != 160);
2580 BUILD_BUG_ON(UBIFS_REF_NODE_SZ != 64);
2581
2582 /*
2583 * We use 2 bit wide bit-fields to store compression type, which should
2584 * be amended if more compressors are added. The bit-fields are:
2585 * @compr_type in 'struct ubifs_inode', @default_compr in
2586 * 'struct ubifs_info' and @compr_type in 'struct ubifs_mount_opts'.
2587 */
2588 BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4);
2589
2590 /*
2591 * We require that PAGE_CACHE_SIZE is greater-than-or-equal-to
2592 * UBIFS_BLOCK_SIZE. It is assumed that both are powers of 2.
2593 */
2594 if (PAGE_CACHE_SIZE < UBIFS_BLOCK_SIZE) {
Heiko Schocherf5895d12014-06-24 10:10:04 +02002595 ubifs_err("VFS page cache size is %u bytes, but UBIFS requires at least 4096 bytes",
Stefan Roese2fc10f62009-03-19 15:35:05 +01002596 (unsigned int)PAGE_CACHE_SIZE);
2597 return -EINVAL;
2598 }
2599
Heiko Schocherf5895d12014-06-24 10:10:04 +02002600#ifndef __UBOOT__
2601 ubifs_inode_slab = kmem_cache_create("ubifs_inode_slab",
2602 sizeof(struct ubifs_inode), 0,
2603 SLAB_MEM_SPREAD | SLAB_RECLAIM_ACCOUNT,
2604 &inode_slab_ctor);
2605 if (!ubifs_inode_slab)
2606 return -ENOMEM;
2607
2608 register_shrinker(&ubifs_shrinker_info);
2609#endif
Stefan Roese2fc10f62009-03-19 15:35:05 +01002610
2611 err = ubifs_compressors_init();
2612 if (err)
2613 goto out_shrinker;
2614
Heiko Schocherf5895d12014-06-24 10:10:04 +02002615#ifndef __UBOOT__
2616 err = dbg_debugfs_init();
2617 if (err)
2618 goto out_compr;
2619
2620 err = register_filesystem(&ubifs_fs_type);
2621 if (err) {
2622 ubifs_err("cannot register file system, error %d", err);
2623 goto out_dbg;
2624 }
2625#endif
Stefan Roese2fc10f62009-03-19 15:35:05 +01002626 return 0;
2627
Heiko Schocherf5895d12014-06-24 10:10:04 +02002628#ifndef __UBOOT__
2629out_dbg:
2630 dbg_debugfs_exit();
2631out_compr:
2632 ubifs_compressors_exit();
2633#endif
Stefan Roese2fc10f62009-03-19 15:35:05 +01002634out_shrinker:
Heiko Schocherf5895d12014-06-24 10:10:04 +02002635#ifndef __UBOOT__
2636 unregister_shrinker(&ubifs_shrinker_info);
2637#endif
2638 kmem_cache_destroy(ubifs_inode_slab);
Stefan Roese2fc10f62009-03-19 15:35:05 +01002639 return err;
2640}
Heiko Schocherf5895d12014-06-24 10:10:04 +02002641/* late_initcall to let compressors initialize first */
2642late_initcall(ubifs_init);
Stefan Roese2fc10f62009-03-19 15:35:05 +01002643
Heiko Schocherf5895d12014-06-24 10:10:04 +02002644#ifndef __UBOOT__
2645static void __exit ubifs_exit(void)
2646{
2647 ubifs_assert(list_empty(&ubifs_infos));
2648 ubifs_assert(atomic_long_read(&ubifs_clean_zn_cnt) == 0);
Stefan Roese2fc10f62009-03-19 15:35:05 +01002649
Heiko Schocherf5895d12014-06-24 10:10:04 +02002650 dbg_debugfs_exit();
2651 ubifs_compressors_exit();
2652 unregister_shrinker(&ubifs_shrinker_info);
Stefan Roese2fc10f62009-03-19 15:35:05 +01002653
Heiko Schocherf5895d12014-06-24 10:10:04 +02002654 /*
2655 * Make sure all delayed rcu free inodes are flushed before we
2656 * destroy cache.
2657 */
2658 rcu_barrier();
2659 kmem_cache_destroy(ubifs_inode_slab);
2660 unregister_filesystem(&ubifs_fs_type);
2661}
2662module_exit(ubifs_exit);
2663
2664MODULE_LICENSE("GPL");
2665MODULE_VERSION(__stringify(UBIFS_VERSION));
2666MODULE_AUTHOR("Artem Bityutskiy, Adrian Hunter");
2667MODULE_DESCRIPTION("UBIFS - UBI File System");
2668#else
2669int uboot_ubifs_mount(char *vol_name)
Stefan Roese2fc10f62009-03-19 15:35:05 +01002670{
Heiko Schocherf5895d12014-06-24 10:10:04 +02002671 struct dentry *ret;
Stefan Roese2fc10f62009-03-19 15:35:05 +01002672 int flags;
Stefan Roese2fc10f62009-03-19 15:35:05 +01002673
2674 /*
2675 * First unmount if allready mounted
2676 */
2677 if (ubifs_sb)
2678 ubifs_umount(ubifs_sb->s_fs_info);
2679
Stefan Roese2fc10f62009-03-19 15:35:05 +01002680 /*
2681 * Mount in read-only mode
2682 */
2683 flags = MS_RDONLY;
Heiko Schocherf5895d12014-06-24 10:10:04 +02002684 ret = ubifs_mount(&ubifs_fs_type, flags, vol_name, NULL);
2685 if (IS_ERR(ret)) {
2686 printf("Error reading superblock on volume '%s' " \
2687 "errno=%d!\n", vol_name, (int)PTR_ERR(ret));
Stefan Roese2fc10f62009-03-19 15:35:05 +01002688 return -1;
2689 }
2690
Stefan Roese2fc10f62009-03-19 15:35:05 +01002691 return 0;
2692}
Heiko Schocherf5895d12014-06-24 10:10:04 +02002693#endif