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fs/squashfs: implement exists() function

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This permits to find a file and use the distro_bootcmd

Reviewed-by: Joao Marcos Costa <jmcosta944@gmail.com>
Signed-off-by: Richard Genoud <richard.genoud@posteo.net>
This commit is contained in:
Richard Genoud 2020-11-03 12:11:26 +01:00 committed by Tom Rini
parent 21b1b3bad5
commit dd4866b437
3 changed files with 40 additions and 1 deletions
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2
fs/fs.c
View File

@ -296,7 +296,7 @@ static struct fstype_info fstypes[] = {
.size = sqfs_size,
.close = sqfs_close,
.closedir = sqfs_closedir,
.exists = fs_exists_unsupported,
.exists = sqfs_exists,
.uuid = fs_uuid_unsupported,
.write = fs_write_unsupported,
.ln = fs_ln_unsupported,

38
fs/squashfs/sqfs.c
View File

@ -1649,6 +1649,44 @@ free_strings:
return ret;
}
int sqfs_exists(const char *filename)
{
struct fs_dir_stream *dirsp = NULL;
struct squashfs_dir_stream *dirs;
char *dir, *file;
struct fs_dirent *dent;
int ret;
sqfs_split_path(&file, &dir, filename);
/*
* sqfs_opendir will uncompress inode and directory tables, and will
* return a pointer to the directory that contains the requested file.
*/
ret = sqfs_opendir(dir, &dirsp);
if (ret) {
ret = -EINVAL;
goto free_strings;
}
dirs = (struct squashfs_dir_stream *)dirsp;
while (!sqfs_readdir(dirsp, &dent)) {
ret = strcmp(dent->name, file);
if (!ret)
break;
free(dirs->entry);
dirs->entry = NULL;
}
sqfs_closedir(dirsp);
free_strings:
free(dir);
free(file);
return ret == 0;
}
void sqfs_close(void)
{
free(ctxt.sblk);

1
include/squashfs.h
View File

@ -19,6 +19,7 @@ int sqfs_probe(struct blk_desc *fs_dev_desc,
int sqfs_read(const char *filename, void *buf, loff_t offset,
loff_t len, loff_t *actread);
int sqfs_size(const char *filename, loff_t *size);
int sqfs_exists(const char *filename);
void sqfs_close(void);
void sqfs_closedir(struct fs_dir_stream *dirs);