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xfs: publish UUID in struct super_block

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Copy the uuid of the filesystem to struct super_block s_uuid field,
as several other filesystems already do.  Copy regardless of the nouuid
mount option, because other filesystems also do not guaranty uniqueness
of the s_uuid field in super_block struct.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Amir Goldstein 2017-04-28 08:10:53 -07:00 committed by Darrick J. Wong
parent 3c3781951c
commit 8f720d9f89
1 changed files with 4 additions and 0 deletions
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4
fs/xfs/xfs_mount.c
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@ -73,6 +73,10 @@ xfs_uuid_mount(
uuid_t *uuid = &mp->m_sb.sb_uuid;
int hole, i;
/* Publish UUID in struct super_block */
BUILD_BUG_ON(sizeof(mp->m_super->s_uuid) != sizeof(uuid_t));
memcpy(&mp->m_super->s_uuid, uuid, sizeof(uuid_t));
if (mp->m_flags & XFS_MOUNT_NOUUID)
return 0;