Unverified Commit ea7d8986 authored by Bart Van Assche's avatar Bart Van Assche Committed by Christian Brauner
Browse files

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: default avatarBart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20240202203926.2478590-6-bvanassche@acm.org


Signed-off-by: default avatarChristian Brauner <brauner@kernel.org>
parent fe3944fb

fs/fcntl.c

+7 −0
Original line number Diff line number Diff line
@@ -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;

}