Merge branch 'stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux...

[karo-tx-linux.git] / fs / btrfs / volumes.c

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 5989a92236f7f1b578ec3ccf88078bb69c1093d3..2854c824ab6443d04eac19cf0b540f79c257cfa0 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -4935,7 +4935,18 @@ int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
        em = lookup_extent_mapping(em_tree, chunk_start, 1);
        read_unlock(&em_tree->lock);
 
-       BUG_ON(!em || em->start != chunk_start);
+       if (!em) {
+               printk(KERN_ERR "btrfs: couldn't find em for chunk %Lu\n",
+                      chunk_start);
+               return -EIO;
+       }
+
+       if (em->start != chunk_start) {
+               printk(KERN_ERR "btrfs: bad chunk start, em=%Lu, wanted=%Lu\n",
+                      em->start, chunk_start);
+               free_extent_map(em);
+               return -EIO;
+       }
        map = (struct map_lookup *)em->bdev;
 
        length = em->len;