btrfs: reada: Add missed segment checking in reada_find_zone

In rechecking zone-in-tree, we still need to check zone include
our logical address.

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c
index 7448080..7e5d4ac 100644 (file)
--- 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);