linux-ext4 - [PATCH 08/13] iomap: assign current->backing_dev_info in iomap_file_buffered

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Date:   Fri, 19 May 2023 11:35:16 +0200
From:   Christoph Hellwig <hch@....de>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Jens Axboe <axboe@...nel.dk>, Xiubo Li <xiubli@...hat.com>,
        Ilya Dryomov <idryomov@...il.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        "Theodore Ts'o" <tytso@....edu>, Jaegeuk Kim <jaegeuk@...nel.org>,
        Chao Yu <chao@...nel.org>, Miklos Szeredi <miklos@...redi.hu>,
        Andreas Gruenbacher <agruenba@...hat.com>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna@...nel.org>,
        Damien Le Moal <dlemoal@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-block@...r.kernel.org, ceph-devel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net (open list:F2FS FILE SYSTEM),
        cluster-devel@...hat.com, linux-xfs@...r.kernel.org,
        linux-nfs@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH 08/13] iomap: assign current->backing_dev_info in iomap_file_buffered_write

Move the assignment to current->backing_dev_info from the callers into
iomap_file_buffered_write to reduce boiler plate code and reduce the
scope to just around the page dirtying loop.

Note that zonefs was missing this assignment before.

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

diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 499ef174dec138..261897fcfbc495 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)
 		written += ret;
 
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 550525a525c45c..b2779bd1f10611 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>
@@ -869,8 +870,10 @@ 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 (unlikely(ret < 0))
 		return ret;
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index bfba10e0b0f3c2..98d763cc3b114c 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);
@@ -751,7 +747,6 @@ xfs_file_buffered_write(
 		goto write_retry;
 	}
 
-	current->backing_dev_info = NULL;
 out:
 	if (iolock)
 		xfs_iunlock(ip, iolock);
-- 
2.39.2