diff options
| author |   Bart Van Assche <bvanassche@acm.org> | 2024-02-02 12:39:24 -0800 |
|---|---|---|
| committer |   Christian Brauner <brauner@kernel.org> | 2024-02-06 14:30:48 +0100 |
| commit | ea7d898676d9e94558c46ba927db35403362389f (patch) | |
| tree | a0e8fa62b729f1ab419178ec092fa20124bd831e /fs/fcntl.c | |
| parent | fs: Move enum rw_hint into a new header file (diff) | |
| download | wireguard-linux-ea7d898676d9e94558c46ba927db35403362389f.tar.xz wireguard-linux-ea7d898676d9e94558c46ba927db35403362389f.zip | |
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>
Diffstat (limited to 'fs/fcntl.c')
| -rw-r--r-- | fs/fcntl.c | 7 |
1 files changed, 7 insertions, 0 deletions
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; } |