linux-ext4 - [PATCH 13/17] block: don't plug in blkdev_write

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Date:   Mon, 24 Apr 2023 07:49:22 +0200
From:   Christoph Hellwig <hch@....de>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Miklos Szeredi <miklos@...redi.hu>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Howells <dhowells@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        ceph-devel@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
        linux-xfs@...r.kernel.org, linux-nfs@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH 13/17] block: don't plug in blkdev_write_iter

Remove the no needed plug in blkdev_write_iter.  For direct I/O that
issues more than a single I/O, the plug is already done in
__blkdev_direct_IO, and for synchronous buffered writes, the plug
is done in writeback_inodes_wb / wb_writeback, while for the other
cases a plug doesn't make sense.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 block/fops.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/block/fops.c b/block/fops.c
index c194939b851cfb..b670aa7c5bb745 100644
--- a/block/fops.c
+++ b/block/fops.c
@@ -520,7 +520,6 @@ static ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
 	struct block_device *bdev = iocb->ki_filp->private_data;
 	struct inode *bd_inode = bdev->bd_inode;
 	loff_t size = bdev_nr_bytes(bdev);
-	struct blk_plug plug;
 	size_t shorted = 0;
 	ssize_t ret;
 
@@ -545,12 +544,10 @@ static ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
 		iov_iter_truncate(from, size);
 	}
 
-	blk_start_plug(&plug);
 	ret = __generic_file_write_iter(iocb, from);
 	if (ret > 0)
 		ret = generic_write_sync(iocb, ret);
 	iov_iter_reexpand(from, iov_iter_count(from) + shorted);
-	blk_finish_plug(&plug);
 	return ret;
 }
 
-- 
2.39.2