Commit 0e4656a2 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'iomap-5.9-merge-5' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux 

Pull iomap updates from Darrick Wong:
 "The most notable changes are:

   - iomap no longer invalidates the page cache when performing a direct
     read, since doing so is unnecessary and the old directio code
     doesn't do that either.

   - iomap embraced the use of returning ENOTBLK from a direct write to
     trigger falling back to a buffered write since ext4 already did
     this and btrfs wants it for their port.

   - iomap falls back to buffered writes if we're doing a direct write
     and the page cache invalidation after the flush fails; this was
     necessary to handle a corner case in the btrfs port.

   - Remove email virus scanner detritus that was accidentally included
     in yesterday's pull request. Clearly I need(ed) to update my git
     branch checker scripts. :("

* tag 'iomap-5.9-merge-5' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  iomap: fall back to buffered writes for invalidation failures
  xfs: use ENOTBLK for direct I/O to buffered I/O fallback
  iomap: Only invalidate page cache pages on direct IO writes
  iomap: Make sure iomap_end is called after iomap_begin
parents eb65405e 60263d58

fs/ext4/file.c

+2 −0
Original line number Diff line number Diff line
@@ -544,6 +544,8 @@ static ssize_t ext4_dio_write_iter(struct kiocb *iocb, struct iov_iter *from) 
		iomap_ops = &ext4_iomap_overwrite_ops;

	ret = iomap_dio_rw(iocb, from, iomap_ops, &ext4_dio_write_ops,

			   is_sync_kiocb(iocb) || unaligned_io || extend);

	if (ret == -ENOTBLK)

		ret = 0;



	if (extend)

		ret = ext4_handle_inode_extension(inode, offset, ret, count);

fs/gfs2/file.c

+2 −1
Original line number Diff line number Diff line
@@ -835,7 +835,8 @@ static ssize_t gfs2_file_direct_write(struct kiocb *iocb, struct iov_iter *from) 


	ret = iomap_dio_rw(iocb, from, &gfs2_iomap_ops, NULL,

			   is_sync_kiocb(iocb));



	if (ret == -ENOTBLK)

		ret = 0;

out:

	gfs2_glock_dq(&gh);

out_uninit:

fs/iomap/apply.c

+9 −4
Original line number Diff line number Diff line
@@ -46,10 +46,14 @@ iomap_apply(struct inode *inode, loff_t pos, loff_t length, unsigned flags, 
	ret = ops->iomap_begin(inode, pos, length, flags, &iomap, &srcmap);

	if (ret)

		return ret;

	if (WARN_ON(iomap.offset > pos))

		return -EIO;

	if (WARN_ON(iomap.length == 0))

		return -EIO;

	if (WARN_ON(iomap.offset > pos)) {

		written = -EIO;

		goto out;

	}

	if (WARN_ON(iomap.length == 0)) {

		written = -EIO;

		goto out;

	}



	trace_iomap_apply_dstmap(inode, &iomap);

	if (srcmap.type != IOMAP_HOLE)
@@ -80,6 +84,7 @@ iomap_apply(struct inode *inode, loff_t pos, loff_t length, unsigned flags, 
	written = actor(inode, pos, length, data, &iomap,

			srcmap.type != IOMAP_HOLE ? &srcmap : &iomap);



out:

	/*

	 * Now the data has been copied, commit the range we've copied.  This

	 * should not fail unless the filesystem has had a fatal error.

fs/iomap/direct-io.c

+21 −16
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
#include <linux/backing-dev.h>

#include <linux/uio.h>

#include <linux/task_io_accounting_ops.h>

#include "trace.h"



#include "../internal.h"
@@ -401,6 +402,9 @@ iomap_dio_actor(struct inode *inode, loff_t pos, loff_t length, 
 * can be mapped into multiple disjoint IOs and only a subset of the IOs issued

 * may be pure data writes. In that case, we still need to do a full data sync

 * completion.

 *

 * Returns -ENOTBLK In case of a page invalidation invalidation failure for

 * writes.  The callers needs to fall back to buffered I/O in this case.

 */

ssize_t

iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
@@ -475,24 +479,25 @@ iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter, 
	if (ret)

		goto out_free_dio;



	if (iov_iter_rw(iter) == WRITE) {

		/*

	 * Try to invalidate cache pages for the range we're direct

	 * writing.  If this invalidation fails, tough, the write will

	 * still work, but racing two incompatible write paths is a

	 * pretty crazy thing to do, so we don't support it 100%.

		 * Try to invalidate cache pages for the range we are writing.

		 * If this invalidation fails, let the caller fall back to

		 * buffered I/O.

		 */

	ret = invalidate_inode_pages2_range(mapping,

			pos >> PAGE_SHIFT, end >> PAGE_SHIFT);

	if (ret)

		dio_warn_stale_pagecache(iocb->ki_filp);

	ret = 0;

		if (invalidate_inode_pages2_range(mapping, pos >> PAGE_SHIFT,

				end >> PAGE_SHIFT)) {

			trace_iomap_dio_invalidate_fail(inode, pos, count);

			ret = -ENOTBLK;

			goto out_free_dio;

		}



	if (iov_iter_rw(iter) == WRITE && !wait_for_completion &&

	    !inode->i_sb->s_dio_done_wq) {

		if (!wait_for_completion && !inode->i_sb->s_dio_done_wq) {

			ret = sb_init_dio_done_wq(inode->i_sb);

			if (ret < 0)

				goto out_free_dio;

		}

	}



	inode_dio_begin(inode);

fs/iomap/trace.h

+1 −0
Original line number Diff line number Diff line
@@ -74,6 +74,7 @@ DEFINE_EVENT(iomap_range_class, name, \ 
DEFINE_RANGE_EVENT(iomap_writepage);

DEFINE_RANGE_EVENT(iomap_releasepage);

DEFINE_RANGE_EVENT(iomap_invalidatepage);

DEFINE_RANGE_EVENT(iomap_dio_invalidate_fail);



#define IOMAP_TYPE_STRINGS \

	{ IOMAP_HOLE,		"HOLE" }, \

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