xfs: growfs not aware of sb_meta_uuid

Adding this simple change to xfstests:common/rc::_scratch_mkfs_xfs:

+ if [ $mkfs_status -eq 0 ]; then
+ xfs_admin -U generate $SCRATCH_DEV > /dev/null
+ fi

triggers all sorts of errors in xfstests. xfs/104 is an example,
where growfs fails with a UUID mismatch corruption detected by
xfs_agf_write_verify() when trying to write the first new AG
headers.

Fix this problem by making sure we copy the sb_meta_uuid into new
metadata written by growfs.

Signed-off-by: Dave Chinner <[e-mail]>
Reviewed-by: Eric Sandeen <[e-mail]>
Signed-off-by: Dave Chinner <[e-mail]>

fs/xfs/xfs_fsops.c

···
 		agf->agf_freeblks = cpu_to_be32(tmpsize);
 		agf->agf_longest = cpu_to_be32(tmpsize);
 		if (xfs_sb_version_hascrc(&mp->m_sb))
-			uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_uuid);
+			uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid);
 
 		error = xfs_bwrite(bp);
 		xfs_buf_relse(bp);
···
 		if (xfs_sb_version_hascrc(&mp->m_sb)) {
 			agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
 			agfl->agfl_seqno = cpu_to_be32(agno);
-			uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_uuid);
+			uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid);
 		}
 
 		agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp);
···
 		agi->agi_newino = cpu_to_be32(NULLAGINO);
 		agi->agi_dirino = cpu_to_be32(NULLAGINO);
 		if (xfs_sb_version_hascrc(&mp->m_sb))
-			uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_uuid);
+			uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid);
 		if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
 			agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp));
 			agi->agi_free_level = cpu_to_be32(1);