linux-kernel - [PATCH 4.5 084/101] btrfs: reada: Fix in-segment calculation for reada

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Message-Id: <20160517011509.815871492@linuxfoundation.org>
Date:	Mon, 16 May 2016 18:21:29 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Zhao Lei <zhaolei@...fujitsu.com>,
	David Sterba <dsterba@...e.com>
Subject: [PATCH 4.5 084/101] btrfs: reada: Fix in-segment calculation for reada

4.5-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Zhao Lei <zhaolei@...fujitsu.com>

commit 503785306d182ab624a2232856ef8ab503ee85f9 upstream.

reada_zone->end is end pos of segment:
 end = start + cache->key.offset - 1;

So we need to use "<=" in condition to judge is a pos in the
segment.

The problem happened rearly, because logical pos rarely pointed
to last 4k of a blockgroup, but we need to fix it to make code
right in logic.

Signed-off-by: Zhao Lei <zhaolei@...fujitsu.com>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/btrfs/reada.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/btrfs/reada.c
+++ b/fs/btrfs/reada.c
@@ -265,7 +265,7 @@ static struct reada_zone *reada_find_zon
 	spin_unlock(&fs_info->reada_lock);
 
 	if (ret == 1) {
-		if (logical >= zone->start && logical < zone->end)
+		if (logical >= zone->start && logical <= zone->end)
 			return zone;
 		spin_lock(&fs_info->reada_lock);
 		kref_put(&zone->refcnt, reada_zone_release);
@@ -679,7 +679,7 @@ static int reada_start_machine_dev(struc
 	 */
 	ret = radix_tree_gang_lookup(&dev->reada_extents, (void **)&re,
 				     dev->reada_next >> PAGE_CACHE_SHIFT, 1);
-	if (ret == 0 || re->logical >= dev->reada_curr_zone->end) {
+	if (ret == 0 || re->logical > dev->reada_curr_zone->end) {
 		ret = reada_pick_zone(dev);
 		if (!ret) {
 			spin_unlock(&fs_info->reada_lock);