ext4: Fix BUG_ON at fs/buffer.c:652 in no journal mode

Calls to ext4_handle_dirty_metadata should only pass in an inode
pointer for inode-specific metadata, and not for shared metadata
blocks such as inode table blocks, block group descriptors, the
superblock, etc.

The BUG_ON can get tripped when updating a special device (such as a
block device) that is opened (so that i_mapping is set in
fs/block_dev.c) and the file system is mounted in no journal mode.

Addresses-Google-Bug: #2404870

Signed-off-by: Curt Wohlgemuth <curtw@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index e4aaf619b56d..004c9da9e5c6 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -898,7 +898,7 @@ repeat_in_this_group:
                                 BUFFER_TRACE(inode_bitmap_bh,
                                         "call ext4_handle_dirty_metadata");
                                 err = ext4_handle_dirty_metadata(handle,
-                                                                 inode,
+                                                                 NULL,
                                                         inode_bitmap_bh);
                                 if (err)
                                         goto fail;