diff mbox series

[11/17] iomap: assign current->backing_dev_info in iomap_file_buffered_write

Message ID 20230424054926.26927-12-hch@lst.de
State Superseded
Headers show
Series None | expand

Commit Message

Christoph Hellwig April 24, 2023, 5:49 a.m. UTC 
Move the assignment to current->backing_dev_info from the callers into
iomap_file_buffered_write.  Note that zonefs was missing this assignment
before.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/gfs2/file.c         | 3 ---
 fs/iomap/buffered-io.c | 4 ++++
 fs/xfs/xfs_file.c      | 5 -----
 3 files changed, 4 insertions(+), 8 deletions(-)

Comments

Christoph Hellwig April 24, 2023, 6:22 a.m. UTC | #1 
On Sun, Apr 23, 2023 at 11:18:25PM -0700, Darrick J. Wong wrote:
> > @@ -876,8 +877,11 @@ iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *i,
> >  	if (iocb->ki_flags & IOCB_NOWAIT)
> >  		iter.flags |= IOMAP_NOWAIT;
> >  
> > +	current->backing_dev_info = inode_to_bdi(iter.inode);
> 
> Dumb question from me late on a Sunday night, but does the iomap_unshare
> code need to set this too?  Since it works by dirtying pagecache folios
> without actually changing the contents?

A very good question that I have no answer for.  The
current->backing_dev_info mechanism confuses the heck out of me and
appears basically undocumented.
diff mbox series

Patch

diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 8c4fad359ff538..4d88c6080b3e30 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -25,7 +25,6 @@ 
 #include <linux/dlm.h>
 #include <linux/dlm_plock.h>
 #include <linux/delay.h>
-#include <linux/backing-dev.h>
 #include <linux/fileattr.h>
 
 #include "gfs2.h"
@@ -1041,11 +1040,9 @@  static ssize_t gfs2_file_buffered_write(struct kiocb *iocb,
 			goto out_unlock;
 	}
 
-	current->backing_dev_info = inode_to_bdi(inode);
 	pagefault_disable();
 	ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
 	pagefault_enable();
-	current->backing_dev_info = NULL;
 	if (ret > 0) {
 		iocb->ki_pos += ret;
 		written += ret;
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 2986be63d2bea6..3d5042efda202a 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -3,6 +3,7 @@ 
  * Copyright (C) 2010 Red Hat, Inc.
  * Copyright (C) 2016-2019 Christoph Hellwig.
  */
+#include <linux/backing-dev.h>
 #include <linux/module.h>
 #include <linux/compiler.h>
 #include <linux/fs.h>
@@ -876,8 +877,11 @@  iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *i,
 	if (iocb->ki_flags & IOCB_NOWAIT)
 		iter.flags |= IOMAP_NOWAIT;
 
+	current->backing_dev_info = inode_to_bdi(iter.inode);
 	while ((ret = iomap_iter(&iter, ops)) > 0)
 		iter.processed = iomap_write_iter(&iter, i);
+	current->backing_dev_info = NULL;
+
 	if (iter.pos == iocb->ki_pos)
 		return ret;
 	return iter.pos - iocb->ki_pos;
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 705250f9f90a1b..f5442e689baf15 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -27,7 +27,6 @@ 
 
 #include <linux/dax.h>
 #include <linux/falloc.h>
-#include <linux/backing-dev.h>
 #include <linux/mman.h>
 #include <linux/fadvise.h>
 #include <linux/mount.h>
@@ -717,9 +716,6 @@  xfs_file_buffered_write(
 	if (ret)
 		goto out;
 
-	/* We can write back this queue in page reclaim */
-	current->backing_dev_info = inode_to_bdi(inode);
-
 	trace_xfs_file_buffered_write(iocb, from);
 	ret = iomap_file_buffered_write(iocb, from,
 			&xfs_buffered_write_iomap_ops);
@@ -753,7 +749,6 @@  xfs_file_buffered_write(
 		goto write_retry;
 	}
 
-	current->backing_dev_info = NULL;
 out:
 	if (iolock)
 		xfs_iunlock(ip, iolock);