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authorBart Van Assche <bvanassche@acm.org>2024-02-02 12:39:24 -0800
committerChristian Brauner <brauner@kernel.org>2024-02-06 14:30:48 +0100
commitea7d898676d9e94558c46ba927db35403362389f (patch)
treea0e8fa62b729f1ab419178ec092fa20124bd831e /fs/fcntl.c
parentfe3944fb245ab99570552a3bf970b00058a9ca6d (diff)
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.c7
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;
}