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xfs: allow writeback on pages without buffer heads

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Disable the IOMAP_F_BUFFER_HEAD flag on file systems with a block size
equal to the page size, and deal with pages without buffer heads in
writeback.  Thanks to the previous refactoring this is basically trivial
now.

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 22:26:04 -07:00
committed by Darrick J. Wong
parent 8e1f065bea
commit ac8ee54669
2 changed files with 40 additions and 16 deletions
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3
fs/xfs/xfs_iomap.c
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@@ -1032,7 +1032,8 @@ xfs_file_iomap_begin(
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
iomap->flags |= IOMAP_F_BUFFER_HEAD;
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)) {