xfs: use iomap_dio_rw

Straight switch over to using iomap for direct I/O - we already have the
non-COW dio path in write_begin for DAX and files with extent size hints,
so nothing to add there.  The COW path is ported over from the old
get_blocks version and a bit of a mess, but I have some work in progress
to make it look more like the buffered I/O COW path.

This gets rid of xfs_get_blocks_direct and the last caller of
xfs_get_blocks with the create flag set, so all that code can be removed.

Last but not least I've removed a comment in xfs_filemap_fault that
refers to xfs_get_blocks entirely instead of updating it - while the
reference is correct, the whole DAX fault path looks different than
the non-DAX one, so it seems rather pointless.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Jens Axboe <axboe@fb.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

1 files changed, 0 insertions, 6 deletions

diff --git a/fs/xfs/xfs_aops.h b/fs/xfs/xfs_aops.h
index 34dc00dfb91d..cc174ec6c2fd 100644
--- a/fs/xfs/xfs_aops.h
+++ b/fs/xfs/xfs_aops.h
@@ -55,12 +55,6 @@ struct xfs_ioend {
 
 extern const struct address_space_operations xfs_address_space_operations;
 
-int	xfs_get_blocks(struct inode *inode, sector_t offset,
-		       struct buffer_head *map_bh, int create);
-int	xfs_get_blocks_direct(struct inode *inode, sector_t offset,
-			      struct buffer_head *map_bh, int create);
-int	xfs_end_io_direct_write(struct kiocb *iocb, loff_t offset,
-		ssize_t size, void *private);
 int	xfs_setfilesize(struct xfs_inode *ip, xfs_off_t offset, size_t size);
 
 extern void xfs_count_page_state(struct page *, int *, int *);