From: Bart Van Assche <bvanassche@acm.org>
Date: Fri, 2 Feb 2024 20:39:24 +0000 (-0800)
Subject: fs: Propagate write hints to the struct block_device inode
X-Git-Tag: block-6.9-20240315~88^2^2~1
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=ea7d898676d9e94558c46ba927db35403362389f;p=linux-block.git

fs: Propagate write hints to the struct block_device inode

Write hints applied with F_SET_RW_HINT on a block device affect the
block device inode only. Propagate these hints to the inode associated
with struct block_device because that is the inode used when writing
back dirty pages.

Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Kanchan Joshi <joshi.k@samsung.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20240202203926.2478590-6-bvanassche@acm.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
---

diff --git a/fs/fcntl.c b/fs/fcntl.c
index 00be0a710bba..8eb6d64a985b 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -317,6 +317,13 @@ static long fcntl_set_rw_hint(struct file *file, unsigned int cmd,
 
 	WRITE_ONCE(inode->i_write_hint, hint);
 
+	/*
+	 * file->f_mapping->host may differ from inode. As an example,
+	 * blkdev_open() modifies file->f_mapping.
+	 */
+	if (file->f_mapping->host != inode)
+		WRITE_ONCE(file->f_mapping->host->i_write_hint, hint);
+
 	return 0;
 }