1 files changed, 8 insertions, 1 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 86e84a8579e3..7ce3f83c5dd6 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1011,9 +1011,16 @@ void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
         spin_lock(&em_tree->lock);
         em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
         spin_unlock(&em_tree->lock);
-        if (!em)
+        if (!em) {
+                __unplug_io_fn(bdi, page);
                 return;
+        }
 
+        if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
+                free_extent_map(em);
+                __unplug_io_fn(bdi, page);
+                return;
+        }
         offset = offset - em->start;
         btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree,
                           em->block_start + offset, page);