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xfs: add support for sub-pagesize writeback without buffer_heads

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Switch to using the iomap_page structure for checking sub-page uptodate
status and track sub-page I/O completion status, and remove large
quantities of boilerplate code working around buffer heads.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig
2018-07-11 22:26:05 -07:00
committed by Darrick J. Wong
parent 9dc55f1389
commit 82cb14175e
5 changed files with 61 additions and 455 deletions
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3
fs/xfs/xfs_iomap.c
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@@ -1032,9 +1032,6 @@ xfs_file_iomap_begin(
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
if (i_blocksize(inode) < PAGE_SIZE)
iomap->flags |= IOMAP_F_BUFFER_HEAD;
if (((flags & (IOMAP_WRITE | IOMAP_DIRECT)) == IOMAP_WRITE) &&
!IS_DAX(inode) && !xfs_get_extsz_hint(ip)) {
/* Reserve delalloc blocks for regular writeback. */