diff options
| author | Christian Gmeiner | 2014-11-12 14:35:04 +0100 |
|---|---|---|
| committer | Tom Rini | 2014-11-23 06:49:01 -0500 |
| commit | 59e890ef7bf5b80d96802e115255f969491ef645 (patch) | |
| tree | 570d6ef6e5a64a25e3a71eaf67273f8e0b8aa013 /include/fs.h | |
| parent | 1b51d32c0f0ac7cdcab0ae04d531129a020cc903 (diff) | |
fs: make it possible to read the filesystem UUID
Some filesystems have a UUID stored in its superblock. To
allow using root=UUID=... for the kernel command line we
need a way to read-out the filesystem UUID.
changes rfc -> v1:
- make the environment variable an option parameter. If not
given, the UUID is printed out. If given, it is stored in the env
variable.
- corrected typos
- return error codes
changes v1 -> v2:
- fix return code of do_fs_uuid(..)
- document do_fs_uuid(..)
- implement fs_uuid_unsuported(..) be more consistent with the
way other optional functionality works
changes v2 -> v3:
- change ext4fs_uuid(..) to make use of #if .. #else .. #endif
construct to get rid of unreachable code
Hit any key to stop autoboot: 0
=> fsuuid
fsuuid - Look up a filesystem UUID
Usage:
fsuuid <interface> <dev>:<part>
- print filesystem UUID
fsuuid <interface> <dev>:<part> <varname>
- set environment variable to filesystem UUID
=> fsuuid mmc 0:1
d9f9fc05-45ae-4a36-a616-fccce0e4f887
=> fsuuid mmc 0:2
eb3db83c-7b28-499f-95ce-9e0bb21cda81
=> fsuuid mmc 0:1 uuid1
=> fsuuid mmc 0:2 uuid2
=> printenv uuid1
uuid1=d9f9fc05-45ae-4a36-a616-fccce0e4f887
=> printenv uuid2
uuid2=eb3db83c-7b28-499f-95ce-9e0bb21cda81
=>
Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
Diffstat (limited to 'include/fs.h')
| -rw-r--r-- | include/fs.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/fs.h b/include/fs.h index 06a45f27883..491c60a7cb9 100644 --- a/include/fs.h +++ b/include/fs.h @@ -93,4 +93,11 @@ int file_exists(const char *dev_type, const char *dev_part, const char *file, int do_save(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[], int fstype); +/* + * Determine the UUID of the specified filesystem and print it. Optionally it is + * possible to store the UUID directly in env. + */ +int do_fs_uuid(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[], + int fstype); + #endif /* _FS_H */ |