On 10/31/2014 09:08 AM, Christian Gmeiner wrote:
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.
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
=>
Acked-by: Stephen Warren <swar...@nvidia.com>
It'd be nice if you could implement fat_uuid() too, and plumb that in.
That could be a separate commit though I suppose.
IIRC, the kernel accepts the format NNNNNNNN-MM where NNNNNNNN is the
32-bit FAT disk ID (I don't recall the exact correct term) in 0-filled
hex and MM is the partition number in 0-filled decimal.
diff --git a/fs/fs.c b/fs/fs.c
+int fs_uuid(char *uuid_str)
+{
+ struct fstype_info *info = fs_get_info(fs_type);
+ int ret = -ENOSYS;
+
+ if (info->uuid)
+ ret = info->uuid(uuid_str);
+
+ return ret;
+}
Actually, that might be better as:
return info->uuid(uuid_str);
To make that work, you'd need to implement a fs_uuid_unsuported()
function and fill it in for all the fs types in fstypes[]. That would be
more consistent with the way other optional functionality works in this
file.
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