Btrfs: fix BUG_ON in btrfs_submit_compressed_write

This is similar to btrfs_submit_compressed_read(), if we fail after
bio is allocated, then we can use bio_endio() and errors are saved
 in bio->bi_error.  But please note that we don't return errors to
its caller because the caller assumes it won't call endio to cleanup
on error.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 658c39b70fba..7a4d9c81aa2a 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -402,7 +402,10 @@ int btrfs_submit_compressed_write(struct inode *inode, u64 start,
                         }
 
                         ret = btrfs_map_bio(root, WRITE, bio, 0, 1);
-                        BUG_ON(ret); /* -ENOMEM */
+                        if (ret) {
+                                bio->bi_error = ret;
+                                bio_endio(bio);
+                        }
 
                         bio_put(bio);
 
@@ -432,7 +435,10 @@ int btrfs_submit_compressed_write(struct inode *inode, u64 start,
         }
 
         ret = btrfs_map_bio(root, WRITE, bio, 0, 1);
-        BUG_ON(ret); /* -ENOMEM */
+        if (ret) {
+                bio->bi_error = ret;
+                bio_endio(bio);
+        }
 
         bio_put(bio);
         return 0;