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'. .bmap works for DAX inodes. [1]

[1]: https://lkml.org/lkml/2018/9/12/803 Fixes: 5f0663bb4a64 ("ext4, dax: introduce ext4_dax_aops") Signed-off-by: Toshi Kani toshi.kani@hpe.com Suggested-by: Jan Kara jack@suse.cz Cc: Jan Kara jack@suse.cz Cc: Dan Williams dan.j.williams@intel.com Cc: "Theodore Ts'o" tytso@mit.edu Cc: Andreas Dilger adilger.kernel@dilger.ca Cc: stable@vger.kernel.org --- fs/ext4/inode.c | 1 + 1 file changed, 1 insertion(+)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index d0dd585add6a..e4acaa980467 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -3948,6 +3948,7 @@ 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, };