Btrfs: sysfs: introduce function btrfs_sysfs_add_fsid() to create sysfs fsid
We need it in a seperate function so that it can be called from the device discovery thread as well. Signed-off-by: NAnand Jain <anand.jain@oracle.com> Signed-off-by: NDavid Sterba <dsterba@suse.cz>
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