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>

diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 658c39b70fba2e5878693aadbb317389b0970969..7a4d9c81aa2a38364c43435bb505c190646a7a6a 100644 (file)
--- 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;