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xfs: fix the forward progress assertion in xfs_iwalk_run_callbacks

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commit a5336d6bb2d02d0e9d4d3c8be04b80b8b68d56c8 upstream.

In commit 27c14b5daa we started tracking the last inode seen during an
inode walk to avoid infinite loops if a corrupt inobt record happens to
have a lower ir_startino than the record preceeding it.  Unfortunately,
the assertion trips over the case where there are completely empty inobt
records (which can happen quite easily on 64k page filesystems) because
we advance the tracking cursor without actually putting the empty record
into the processing buffer.  Fix the assert to allow for this case.

Reported-by: zlang@redhat.com
Fixes: 27c14b5daa ("xfs: ensure inobt record walks always make forward progress")
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Zorro Lang <zlang@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Darrick J. Wong 2022-05-27 16:02:17 +03:00 committed by Greg Kroah-Hartman
parent 45d97f70da
commit 72464fd2b4
1 changed files with 1 additions and 1 deletions
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fs/xfs/xfs_iwalk.c
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@ -363,7 +363,7 @@ xfs_iwalk_run_callbacks(
/* Delete cursor but remember the last record we cached... */
xfs_iwalk_del_inobt(tp, curpp, agi_bpp, 0);
irec = &iwag->recs[iwag->nr_recs - 1];
ASSERT(next_agino == irec->ir_startino + XFS_INODES_PER_CHUNK);
ASSERT(next_agino >= irec->ir_startino + XFS_INODES_PER_CHUNK);
error = xfs_iwalk_ag_recs(iwag);
if (error)