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From:   "NeilBrown" <neilb@suse.de>
To:     "OGAWA Hirofumi" <hirofumi@mail.parknet.co.jp>
Cc:     linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
        "Christoph Hellwig" <hch@infradead.org>
Subject: [PATCH v2] FAT: use schedule_timeout_uninterruptible() instead of
 congestion_wait()
In-reply-to: <163911011670.9928.6438117555175130033@noble.neil.brown.name>
References: <163712349419.13692.2859038330142282757@noble.neil.brown.name>,
 <87ee79yiik.fsf@mail.parknet.co.jp>,
 <163754226639.13692.10449616189734943162@noble.neil.brown.name>,
 <874k84hi5q.fsf@mail.parknet.co.jp>,
 <163911011670.9928.6438117555175130033@noble.neil.brown.name>
Date:   Fri, 10 Dec 2021 15:22:49 +1100
Message-id: <163911016975.9928.6568675782275129@noble.neil.brown.name>
Precedence: bulk


congestion_wait() in this context is just a sleep - block devices do not
in general support congestion signalling any more.

The goal here is to wait for any recently written data to get to
storage.  blkdev_issue_flush() is thought to be too expensive, so
replace congestion_wait() with an explicit timeout.

Signed-off-by: NeilBrown <neilb@suse.de>
---
 fs/fat/file.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/fat/file.c b/fs/fat/file.c
index 13855ba49cd9..2321fb3eded5 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -175,9 +175,9 @@ long fat_generic_ioctl(struct file *filp, unsigned int cm=
d, unsigned long arg)
 static int fat_file_release(struct inode *inode, struct file *filp)
 {
 	if ((filp->f_mode & FMODE_WRITE) &&
-	     MSDOS_SB(inode->i_sb)->options.flush) {
+	    MSDOS_SB(inode->i_sb)->options.flush) {
 		fat_flush_inodes(inode->i_sb, inode, NULL);
-		congestion_wait(BLK_RW_ASYNC, HZ/10);
+		schedule_timeout_uninterruptible(HZ/10);
 	}
 	return 0;
 }
--=20
2.34.1