fs: exfat: Add U-Boot porting layer
Add U-Boot adjustments to the libexfat code and integrate
the result into U-Boot filesystem layer. This provides full
read-write exfat support for U-Boot available via generic
filesystem interface.
FS_DIRENT_NAME_LEN is increased to 1024 in case exfat is
enabled, because EXFAT can use UTF16 names, which do not
fit into current FS_DIRENT_NAME_LEN. To avoid affecting
every configuration, increase FS_DIRENT_NAME_LEN only in
case EXFAT is enabled.
Example usage via sandbox, assuming disk.img with one exfat partition:
Drive info:
$ ./u-boot -Tc 'host bind 0 ../disk.img ; host info 0'
dev blocks blksz label path
0 262144 512 0 ../disk.img
List files:
$ ./u-boot -Tc 'host bind 0 ../disk.img ; ls host 0:1 /api'
475 Kconfig
230 Makefile
1873 README
...
10 file(s), 0 dir(s)
Load and checksum a file:
$ ./u-boot -Tc 'host bind 0 ../disk.img ; load host 0:1 $loadaddr .config ; \
crc32 $loadaddr $filesize'
56724 bytes read in 1 ms (54.1 MiB/s)
crc32 for 00000000 ... 0000dd93 ==> b2e847c9
$ crc32 .config
b2e847c9
Load .config file to RAM, store the file into FS as /newconfig,
load the /newconfig into RAM and checksum the file:
$ ./u-boot -Tc 'host bind 0 ../disk.img ; load host 0:1 $loadaddr .config ; \
save host 0:1 $loadaddr /newconfig $filesize ; \
load host 0:1 0x10000 /newconfig ; \
crc32 0x10000 $filesize'
56724 bytes read in 1 ms (54.1 MiB/s)
56724 bytes written in 0 ms
56724 bytes read in 0 ms
crc32 for 00010000 ... 0001dd93 ==> b2e847c9
Remove file 3.txt and create new directory /newdir:
$ ./u-boot -Tc 'host bind 0 ../disk.img ; ls host 0:1 / ; \
rm host 0:1 3.txt ; mkdir host 0:1 /newdir ; \
ls host 0:1 /'
...
0 1.txt
0 2.txt
0 3.txt
0 4.txt
0 5.txt
7 file(s), 4 dir(s)
...
0 1.txt
0 2.txt
newdir/
0 4.txt
0 5.txt
6 file(s), 5 dir(s)
Acked-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Marek Vasut <marex@denx.de>
diff --git a/fs/exfat/io.c b/fs/exfat/io.c
index 7af5316..81e8282 100644
--- a/fs/exfat/io.c
+++ b/fs/exfat/io.c
@@ -22,6 +22,7 @@
#include "exfat.h"
#include <inttypes.h>
+#ifndef __UBOOT__
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
@@ -44,6 +45,16 @@
#include <sys/uio.h>
#include <ublio.h>
#endif
+#else
+#include <fs.h>
+#include <fs_internal.h>
+
+static struct exfat_ctxt {
+ struct disk_partition cur_part_info;
+ struct blk_desc *cur_dev;
+ struct exfat ef;
+} ctxt;
+#endif
struct exfat_dev
{
@@ -54,8 +65,12 @@
off_t pos;
ublio_filehandle_t ufh;
#endif
+#ifdef __UBOOT__
+ struct exfat_ctxt *ctxt;
+#endif
};
+#ifndef __UBOOT__
static bool is_open(int fd)
{
return fcntl(fd, F_GETFD) != -1;
@@ -386,6 +401,74 @@
return pwrite(dev->fd, buffer, size, offset);
#endif
}
+#else /* U-Boot */
+struct exfat_dev* exfat_open(const char* spec, enum exfat_mode mode)
+{
+ struct exfat_dev* dev;
+
+ dev = malloc(sizeof(struct exfat_dev));
+ if (!dev) {
+ exfat_error("failed to allocate memory for device structure");
+ return NULL;
+ }
+ dev->mode = EXFAT_MODE_RW;
+ dev->size = ctxt.cur_part_info.size * ctxt.cur_part_info.blksz;
+ dev->ctxt = &ctxt;
+
+ return dev;
+}
+
+int exfat_close(struct exfat_dev* dev)
+{
+ free(dev);
+ return 0;
+}
+
+int exfat_fsync(struct exfat_dev* dev)
+{
+ return 0;
+}
+
+enum exfat_mode exfat_get_mode(const struct exfat_dev* dev)
+{
+ return dev->mode;
+}
+
+off_t exfat_get_size(const struct exfat_dev* dev)
+{
+ return dev->size;
+}
+
+ssize_t exfat_pread(struct exfat_dev* dev, void* buffer, size_t size,
+ off_t offset)
+{
+ lbaint_t sect = offset >> ctxt.cur_dev->log2blksz;
+ int off = offset & (ctxt.cur_dev->blksz - 1);
+
+ if (!ctxt.cur_dev)
+ return -EIO;
+
+ if (fs_devread(ctxt.cur_dev, &ctxt.cur_part_info, sect,
+ off, size, buffer))
+ return 0;
+ return -EIO;
+}
+
+ssize_t exfat_pwrite(struct exfat_dev* dev, const void* buffer, size_t size,
+ off_t offset)
+{
+ lbaint_t sect = offset >> ctxt.cur_dev->log2blksz;
+ int off = offset & (ctxt.cur_dev->blksz - 1);
+
+ if (!ctxt.cur_dev)
+ return -EIO;
+
+ if (fs_devwrite(ctxt.cur_dev, &ctxt.cur_part_info, sect,
+ off, size, buffer))
+ return 0;
+ return -EIO;
+}
+#endif
ssize_t exfat_generic_pread(const struct exfat* ef, struct exfat_node* node,
void* buffer, size_t size, off_t offset)
@@ -512,3 +595,406 @@
exfat_update_mtime(node);
return size - remainder;
}
+
+#ifdef __UBOOT__
+struct exfat_dir_stream {
+ struct fs_dir_stream fs_dirs;
+ struct fs_dirent dirent;
+
+ struct exfat_node* node;
+ struct exfat_iterator it;
+ /* State tracker flags for emulated . and .. dirents */
+ bool dot;
+ bool dotdot;
+};
+
+int exfat_fs_probe(struct blk_desc *fs_dev_desc,
+ struct disk_partition *fs_partition)
+{
+ int ret;
+
+ ctxt.cur_dev = fs_dev_desc;
+ ctxt.cur_part_info = *fs_partition;
+
+ ret = exfat_mount(&ctxt.ef, NULL, "");
+ if (ret)
+ goto error;
+
+ return 0;
+error:
+ ctxt.cur_dev = NULL;
+ return ret;
+}
+
+#define PATH_MAX FS_DIRENT_NAME_LEN
+
+/* Adapted from uclibc 1.0.35 */
+static char *exfat_realpath(const char *path, char got_path[])
+{
+ char copy_path[PATH_MAX];
+ char *max_path, *new_path;
+ size_t path_len;
+
+ if (path == NULL)
+ return NULL;
+
+ if (*path == '\0')
+ return NULL;
+
+ /* Make a copy of the source path since we may need to modify it. */
+ path_len = strlen(path);
+ if (path_len >= PATH_MAX - 2)
+ return NULL;
+
+ /* Copy so that path is at the end of copy_path[] */
+ strcpy(copy_path + (PATH_MAX-1) - path_len, path);
+ path = copy_path + (PATH_MAX-1) - path_len;
+ max_path = got_path + PATH_MAX - 2; /* points to last non-NUL char */
+ new_path = got_path;
+ *new_path++ = '/';
+ path++;
+
+ /* Expand each slash-separated pathname component. */
+ while (*path != '\0') {
+ /* Ignore stray "/". */
+ if (*path == '/') {
+ path++;
+ continue;
+ }
+
+ if (*path == '.') {
+ /* Ignore ".". */
+ if (path[1] == '\0' || path[1] == '/') {
+ path++;
+ continue;
+ }
+
+ if (path[1] == '.') {
+ if (path[2] == '\0' || path[2] == '/') {
+ path += 2;
+ /* Ignore ".." at root. */
+ if (new_path == got_path + 1)
+ continue;
+ /* Handle ".." by backing up. */
+ while ((--new_path)[-1] != '/')
+ ;
+ continue;
+ }
+ }
+ }
+
+ /* Safely copy the next pathname component. */
+ while (*path != '\0' && *path != '/') {
+ if (new_path > max_path)
+ return NULL;
+ *new_path++ = *path++;
+ }
+
+ *new_path++ = '/';
+ }
+
+ /* Delete trailing slash but don't whomp a lone slash. */
+ if (new_path != got_path + 1 && new_path[-1] == '/')
+ new_path--;
+
+ /* Make sure it's null terminated. */
+ *new_path = '\0';
+ return got_path;
+}
+
+int exfat_lookup_realpath(struct exfat* ef, struct exfat_node** node,
+ const char* path)
+{
+ char input_path[FS_DIRENT_NAME_LEN];
+ char real_path[FS_DIRENT_NAME_LEN];
+ char *name;
+
+ /* Input is always absolute path */
+ snprintf(input_path, FS_DIRENT_NAME_LEN, "/%s", path);
+ name = exfat_realpath(input_path, real_path);
+ if (!name)
+ return -EINVAL;
+
+ return exfat_lookup(ef, node, real_path);
+}
+
+int exfat_fs_opendir(const char *filename, struct fs_dir_stream **dirsp)
+{
+ struct exfat_dir_stream *dirs;
+ int err;
+
+ dirs = calloc(1, sizeof(*dirs));
+ if (!dirs)
+ return -ENOMEM;
+
+ err = exfat_lookup_realpath(&ctxt.ef, &dirs->node, filename);
+ if (err)
+ goto err_out;
+
+ if (!(dirs->node->attrib & EXFAT_ATTRIB_DIR)) {
+ err = -ENOTDIR;
+ goto err_out;
+ }
+
+ err = exfat_opendir(&ctxt.ef, dirs->node, &dirs->it);
+ if (err)
+ goto err_out;
+
+ *dirsp = &dirs->fs_dirs;
+
+ return 0;
+err_out:
+ free(dirs);
+ return err;
+}
+
+int exfat_fs_readdir(struct fs_dir_stream *fs_dirs, struct fs_dirent **dentp)
+{
+ struct exfat_dir_stream *dirs =
+ container_of(fs_dirs, struct exfat_dir_stream, fs_dirs);
+ struct fs_dirent *dent = &dirs->dirent;
+ struct exfat_node* node;
+
+ /* Emulate current directory ./ */
+ if (!dirs->dot) {
+ dirs->dot = true;
+ snprintf(dent->name, FS_DIRENT_NAME_LEN, ".");
+ dent->type = FS_DT_DIR;
+ *dentp = dent;
+ return 0;
+ }
+
+ /* Emulate parent directory ../ */
+ if (!dirs->dotdot) {
+ dirs->dotdot = true;
+ snprintf(dent->name, FS_DIRENT_NAME_LEN, "..");
+ dent->type = FS_DT_DIR;
+ *dentp = dent;
+ return 0;
+ }
+
+ /* Read actual directory content */
+ node = exfat_readdir(&dirs->it);
+ if (!node) { /* No more content, reset . and .. emulation */
+ dirs->dot = false;
+ dirs->dotdot = false;
+ return 1;
+ }
+
+ exfat_get_name(node, dent->name);
+ if (node->attrib & EXFAT_ATTRIB_DIR) {
+ dent->type = FS_DT_DIR;
+ } else {
+ dent->type = FS_DT_REG;
+ dent->size = node->size;
+ }
+
+ *dentp = dent;
+
+ return 0;
+}
+
+void exfat_fs_closedir(struct fs_dir_stream *fs_dirs)
+{
+ free(fs_dirs);
+}
+
+int exfat_fs_ls(const char *dirname)
+{
+ struct exfat_node *dnode, *node;
+ char name[FS_DIRENT_NAME_LEN];
+ int nfiles = 0, ndirs = 2;
+ struct exfat_iterator it;
+ int err;
+
+ err = exfat_lookup_realpath(&ctxt.ef, &dnode, dirname);
+ if (err)
+ return err;
+
+ if (!(dnode->attrib & EXFAT_ATTRIB_DIR)) {
+ err = -ENOTDIR;
+ goto err_out;
+ }
+
+ err = exfat_opendir(&ctxt.ef, dnode, &it);
+ if (err)
+ goto err_out;
+
+ printf(" ./\n");
+ printf(" ../\n");
+
+ /* Read actual directory content */
+ while ((node = exfat_readdir(&it))) {
+ exfat_get_name(node, name);
+ if (node->attrib & EXFAT_ATTRIB_DIR) {
+ printf(" %s/\n", name);
+ ndirs++;
+ } else {
+ printf(" %8lld %s\n", node->size, name);
+ nfiles++;
+ }
+ exfat_put_node(&ctxt.ef, node);
+ }
+
+ printf("\n%d file(s), %d dir(s)\n\n", nfiles, ndirs);
+
+ exfat_closedir(&ctxt.ef, &it);
+
+err_out:
+ exfat_put_node(&ctxt.ef, dnode);
+ return err;
+}
+
+int exfat_fs_exists(const char *filename)
+{
+ struct exfat_node* node;
+ int err;
+
+ err = exfat_lookup_realpath(&ctxt.ef, &node, filename);
+ if (err)
+ return err;
+
+ exfat_put_node(&ctxt.ef, node);
+
+ return 0;
+}
+
+int exfat_fs_size(const char *filename, loff_t *size)
+{
+ struct exfat_node* node;
+ int err;
+
+ err = exfat_lookup_realpath(&ctxt.ef, &node, filename);
+ if (err)
+ return err;
+
+ *size = node->size;
+
+ exfat_put_node(&ctxt.ef, node);
+
+ return 0;
+}
+
+int exfat_fs_read(const char *filename, void *buf, loff_t offset, loff_t len,
+ loff_t *actread)
+{
+ struct exfat_node* node;
+ ssize_t sz;
+ int err;
+
+ err = exfat_lookup_realpath(&ctxt.ef, &node, filename);
+ if (err)
+ return err;
+
+ if (!len)
+ len = node->size;
+
+ sz = exfat_generic_pread(&ctxt.ef, node, buf, len, offset);
+ if (sz < 0) {
+ *actread = 0;
+ err = -EINVAL;
+ goto exit;
+ }
+
+ *actread = sz;
+
+ exfat_put_node(&ctxt.ef, node);
+
+ return exfat_flush_node(&ctxt.ef, node);
+exit:
+ exfat_put_node(&ctxt.ef, node);
+ return err;
+}
+
+int exfat_fs_unlink(const char *filename)
+{
+ struct exfat_node* node;
+ int err;
+
+ err = exfat_lookup_realpath(&ctxt.ef, &node, filename);
+ if (err) {
+ printf("%s: doesn't exist (%d)\n", filename, err);
+ return err;
+ }
+
+ if (node->attrib & EXFAT_ATTRIB_DIR) {
+ err = exfat_rmdir(&ctxt.ef, node);
+ if (err == -ENOTEMPTY)
+ printf("Error: directory is not empty: %d\n", err);
+ } else {
+ err = exfat_unlink(&ctxt.ef, node);
+ }
+
+ if (err)
+ goto exit;
+
+ exfat_put_node(&ctxt.ef, node);
+
+ return exfat_cleanup_node(&ctxt.ef, node);
+exit:
+ exfat_put_node(&ctxt.ef, node);
+ return err;
+}
+
+int exfat_fs_mkdir(const char *dirname)
+{
+ if (!strcmp(dirname, ".") || !strcmp(dirname, ".."))
+ return -EINVAL;
+
+ return exfat_mkdir(&ctxt.ef, dirname);
+}
+
+int exfat_fs_write(const char *filename, void *buf, loff_t offset,
+ loff_t len, loff_t *actwrite)
+{
+ struct exfat_node* node;
+ ssize_t sz;
+ int err;
+
+ /*
+ * Ignore -EEXIST error here, if the file exists,
+ * this write should act as an append to offset.
+ */
+ err = exfat_mknod(&ctxt.ef, filename);
+ if (err && err != -EEXIST)
+ return err;
+
+ err = exfat_lookup_realpath(&ctxt.ef, &node, filename);
+ if (err)
+ return err;
+
+ /* Write into directories is not allowed. */
+ if (node->attrib & EXFAT_ATTRIB_DIR)
+ return -EISDIR;
+
+ /* Write past end of file is not allowed. */
+ if (offset > node->size) {
+ err = -EINVAL;
+ goto exit;
+ }
+
+ sz = exfat_generic_pwrite(&ctxt.ef, node, buf, len, offset);
+ if (sz < 0) {
+ *actwrite = 0;
+ err = -EINVAL;
+ goto exit;
+ }
+
+ err = exfat_truncate(&ctxt.ef, node, offset + sz, false);
+ if (err)
+ goto exit;
+
+ *actwrite = sz;
+
+ err = exfat_flush_node(&ctxt.ef, node);
+exit:
+ exfat_put_node(&ctxt.ef, node);
+ return err;
+}
+
+void exfat_fs_close(void)
+{
+ exfat_unmount(&ctxt.ef);
+ ctxt.cur_dev = NULL;
+}
+#endif /* __U_BOOT__ */