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xfs: fix getfsmap reporting past the last rt extent

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The realtime section ends at the last rt extent.  If the user configures
the rt geometry with an extent size that is not an integer factor of the
number of rt blocks, it's possible for there to be rt blocks past the
end of the last rt extent.  These tail blocks cannot ever be allocated
and will cause corruption reports if the last extent coincides with the
end of an rt bitmap block, so do not report consider them for the
GETFSMAP output.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2023-06-29 17:39:44 -07:00
parent 7975aba19c
commit d898137d78
1 changed files with 1 additions and 1 deletions
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2
fs/xfs/xfs_fsmap.c
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@ -529,7 +529,7 @@ __xfs_getfsmap_rtdev(
uint64_t eofs;
int error = 0;
eofs = XFS_FSB_TO_BB(mp, mp->m_sb.sb_rblocks);
eofs = XFS_FSB_TO_BB(mp, mp->m_sb.sb_rextents * mp->m_sb.sb_rextsize);
if (keys[0].fmr_physical >= eofs)
return 0;
start_rtb = XFS_BB_TO_FSBT(mp,