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xfs: simple btree query range should look right if LE lookup fails

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If the initial LOOKUP_LE in the simple query range fails to find
anything, we should attempt to increment the btree cursor to see
if there actually /are/ records for what we're trying to find.
Without this patch, a bnobt range query of (0, $agsize) returns
no results because the leftmost record never has a startblock
of zero.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Darrick J. Wong 2016-08-26 16:00:10 +10:00 committed by Dave Chinner
parent 722278997b
commit 5b5c2dbd3c
1 changed files with 7 additions and 0 deletions
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7
fs/xfs/libxfs/xfs_btree.c
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@ -4558,6 +4558,13 @@ xfs_btree_simple_query_range(
if (error)
goto out;
/* Nothing? See if there's anything to the right. */
if (!stat) {
error = xfs_btree_increment(cur, 0, &stat);
if (error)
goto out;
}
while (stat) {
/* Find the record. */
error = xfs_btree_get_rec(cur, &recp, &stat);