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xfs: revert "xfs: fix rmap key and record comparison functions"

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This reverts commit 6ff646b2ce.

Your maintainer committed a major braino in the rmap code by adding the
attr fork, bmbt, and unwritten extent usage bits into rmap record key
comparisons.  While XFS uses the usage bits *in the rmap records* for
cross-referencing metadata in xfs_scrub and xfs_repair, it only needs
the owner and offset information to distinguish between reverse mappings
of the same physical extent into the data fork of a file at multiple
offsets.  The other bits are not important for key comparisons for index
lookups, and never have been.

Eric Sandeen reports that this causes regressions in generic/299, so
undo this patch before it does more damage.

Reported-by: Eric Sandeen <sandeen@sandeen.net>
Fixes: 6ff646b2ce ("xfs: fix rmap key and record comparison functions")
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
This commit is contained in:
Darrick J. Wong 2020-11-19 15:17:50 -08:00
parent 883a790a84
commit eb8409071a
1 changed files with 8 additions and 8 deletions
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16
fs/xfs/libxfs/xfs_rmap_btree.c
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@ -243,8 +243,8 @@ xfs_rmapbt_key_diff(
else if (y > x)
return -1;
x = be64_to_cpu(kp->rm_offset);
y = xfs_rmap_irec_offset_pack(rec);
x = XFS_RMAP_OFF(be64_to_cpu(kp->rm_offset));
y = rec->rm_offset;
if (x > y)
return 1;
else if (y > x)
@ -275,8 +275,8 @@ xfs_rmapbt_diff_two_keys(
else if (y > x)
return -1;
x = be64_to_cpu(kp1->rm_offset);
y = be64_to_cpu(kp2->rm_offset);
x = XFS_RMAP_OFF(be64_to_cpu(kp1->rm_offset));
y = XFS_RMAP_OFF(be64_to_cpu(kp2->rm_offset));
if (x > y)
return 1;
else if (y > x)
@ -390,8 +390,8 @@ xfs_rmapbt_keys_inorder(
return 1;
else if (a > b)
return 0;
a = be64_to_cpu(k1->rmap.rm_offset);
b = be64_to_cpu(k2->rmap.rm_offset);
a = XFS_RMAP_OFF(be64_to_cpu(k1->rmap.rm_offset));
b = XFS_RMAP_OFF(be64_to_cpu(k2->rmap.rm_offset));
if (a <= b)
return 1;
return 0;
@ -420,8 +420,8 @@ xfs_rmapbt_recs_inorder(
return 1;
else if (a > b)
return 0;
a = be64_to_cpu(r1->rmap.rm_offset);
b = be64_to_cpu(r2->rmap.rm_offset);
a = XFS_RMAP_OFF(be64_to_cpu(r1->rmap.rm_offset));
b = XFS_RMAP_OFF(be64_to_cpu(r2->rmap.rm_offset));
if (a <= b)
return 1;
return 0;