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iomap: lift the xfs writeback code to iomap

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Take the xfs writeback code and move it to fs/iomap.  A new structure
with three methods is added as the abstraction from the generic writeback
code to the file system.  These methods are used to map blocks, submit an
ioend, and cancel a page that encountered an error before it was added to
an ioend.

Signed-off-by: Christoph Hellwig <hch@lst.de>
[darrick: rename ->submit_ioend to ->prepare_ioend to clarify what it
does]
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Christoph Hellwig
2019-10-17 13:12:15 -07:00
committed by Darrick J. Wong
parent 9e91c5728c
commit 598ecfbaa7
7 changed files with 669 additions and 648 deletions
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17
fs/xfs/xfs_aops.h
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@@ -6,23 +6,6 @@
#ifndef __XFS_AOPS_H__
#define __XFS_AOPS_H__
extern struct bio_set xfs_ioend_bioset;
/*
* Structure for buffered I/O completions.
*/
struct xfs_ioend {
struct list_head io_list; /* next ioend in chain */
u16 io_type;
u16 io_flags; /* IOMAP_F_* */
struct inode *io_inode; /* file being written to */
size_t io_size; /* size of the extent */
xfs_off_t io_offset; /* offset in the file */
void *io_private; /* file system private data */
struct bio *io_bio; /* bio being built */
struct bio io_inline_bio; /* MUST BE LAST! */
};
extern const struct address_space_operations xfs_address_space_operations;
extern const struct address_space_operations xfs_dax_aops;