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fs: Add a new command to create symbolic links

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The command line is:
ln <interface> <dev[:part]> target linkname

Currently symbolic links are supported only in ext4 and only if the option
CMD_EXT4_WRITE is enabled.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Jean-Jacques Hiblot
2019-02-13 12:15:26 +01:00
committed by Tom Rini
parent 5efc0686ee
commit aaa12157c7
3 changed files with 60 additions and 0 deletions
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44
fs/fs.c
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@@ -90,6 +90,11 @@ static inline int fs_write_unsupported(const char *filename, void *buf,
return -1;
}
static inline int fs_ln_unsupported(const char *filename, const char *target)
{
return -1;
}
static inline void fs_close_unsupported(void)
{
}
@@ -154,6 +159,7 @@ struct fstype_info {
void (*closedir)(struct fs_dir_stream *dirs);
int (*unlink)(const char *filename);
int (*mkdir)(const char *dirname);
int (*ln)(const char *filename, const char *target);
};
static struct fstype_info fstypes[] = {
@@ -181,6 +187,7 @@ static struct fstype_info fstypes[] = {
.opendir = fat_opendir,
.readdir = fat_readdir,
.closedir = fat_closedir,
.ln = fs_ln_unsupported,
},
#endif
@@ -197,8 +204,10 @@ static struct fstype_info fstypes[] = {
.read = ext4_read_file,
#ifdef CONFIG_CMD_EXT4_WRITE
.write = ext4_write_file,
.ln = ext4fs_create_link,
#else
.write = fs_write_unsupported,
.ln = fs_ln_unsupported,
#endif
.uuid = ext4fs_uuid,
.opendir = fs_opendir_unsupported,
@@ -222,6 +231,7 @@ static struct fstype_info fstypes[] = {
.opendir = fs_opendir_unsupported,
.unlink = fs_unlink_unsupported,
.mkdir = fs_mkdir_unsupported,
.ln = fs_ln_unsupported,
},
#endif
#ifdef CONFIG_CMD_UBIFS
@@ -240,6 +250,7 @@ static struct fstype_info fstypes[] = {
.opendir = fs_opendir_unsupported,
.unlink = fs_unlink_unsupported,
.mkdir = fs_mkdir_unsupported,
.ln = fs_ln_unsupported,
},
#endif
#ifdef CONFIG_FS_BTRFS
@@ -258,6 +269,7 @@ static struct fstype_info fstypes[] = {
.opendir = fs_opendir_unsupported,
.unlink = fs_unlink_unsupported,
.mkdir = fs_mkdir_unsupported,
.ln = fs_ln_unsupported,
},
#endif
{
@@ -275,6 +287,7 @@ static struct fstype_info fstypes[] = {
.opendir = fs_opendir_unsupported,
.unlink = fs_unlink_unsupported,
.mkdir = fs_mkdir_unsupported,
.ln = fs_ln_unsupported,
},
};
@@ -602,6 +615,22 @@ int fs_mkdir(const char *dirname)
return ret;
}
int fs_ln(const char *fname, const char *target)
{
struct fstype_info *info = fs_get_info(fs_type);
int ret;
ret = info->ln(fname, target);
if (ret < 0) {
printf("** Unable to create link %s -> %s **\n", fname, target);
ret = -1;
}
fs_close();
return ret;
}
int do_size(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
int fstype)
{
@@ -840,3 +869,18 @@ int do_mkdir(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
return 0;
}
int do_ln(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
int fstype)
{
if (argc != 5)
return CMD_RET_USAGE;
if (fs_set_blk_dev(argv[1], argv[2], fstype))
return 1;
if (fs_ln(argv[3], argv[4]))
return 1;
return 0;
}