[3/3] btrfs: Add missed segment checking in reada_find_zone
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Message ID 9df6577e7e2660fc61483b9fdf96aa51f81e8a10.1450447809.git.zhaolei@cn.fujitsu.com
State New
Headers show

Commit Message

Zhaolei Dec. 18, 2015, 2:10 p.m. UTC
In rechecking zone-in-tree, we still need to check zone include
our logical address.

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
---
 fs/btrfs/reada.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Patch
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diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c
index d8116fe..c65b42f 100644
--- a/fs/btrfs/reada.c
+++ b/fs/btrfs/reada.c
@@ -303,8 +303,10 @@  static struct reada_zone *reada_find_zone(struct btrfs_fs_info *fs_info,
 		kfree(zone);
 		ret = radix_tree_gang_lookup(&dev->reada_zones, (void **)&zone,
 					     logical >> PAGE_CACHE_SHIFT, 1);
-		if (ret == 1)
+		if (ret == 1 && logical >= zone->start && logical <= zone->end)
 			kref_get(&zone->refcnt);
+		else
+			zone = NULL;
 	}
 	spin_unlock(&fs_info->reada_lock);