From: Darrick J. Wong <darrick.wong@oracle.com>
Date: Fri, 26 Aug 2016 06:00:10 +0000 (+1000)
Subject: xfs: simple btree query range should look right if LE lookup fails
X-Git-Tag: v4.8-rc5~23^2~4
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5b5c2dbd3c9bcfa89fba9709c12ecc0a445c6e40;p=platform%2Fkernel%2Flinux-exynos.git

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

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>
---

diff --git a/fs/xfs/libxfs/xfs_btree.c b/fs/xfs/libxfs/xfs_btree.c
index b70d9f9..0856979 100644
--- a/fs/xfs/libxfs/xfs_btree.c
+++ b/fs/xfs/libxfs/xfs_btree.c
@@ -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);