ext4, dax: add ext4_bmap to ext4_dax_aops

commit 94dbb63117e82253c9592816aa4465f0a9c94850 upstream.

Ext4 mount path calls .bmap to the journal inode. This currently
works for the DAX mount case because ext4_iget() always set
'ext4_da_aops' to any regular files.

In preparation to fix ext4_iget() to set 'ext4_dax_aops' for ext4
DAX files, add ext4_bmap() to 'ext4_dax_aops', since bmap works for
DAX inodes.

Fixes: 5f0663bb4a64 ("ext4, dax: introduce ext4_dax_aops")
Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Suggested-by: Jan Kara <jack@suse.cz>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 0f730a5eda6775f6bf6c207b3f626d8761434966..6042c019ea54bcc0a91f9a8af8212795bd50d49d 100644 (file)
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3951,6 +3951,7 @@ static const struct address_space_operations ext4_dax_aops = {
        .writepages             = ext4_dax_writepages,
        .direct_IO              = noop_direct_IO,
        .set_page_dirty         = noop_set_page_dirty,
+       .bmap                   = ext4_bmap,
        .invalidatepage         = noop_invalidatepage,
 };