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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>
This commit is contained in:
Bart Van Assche 2024-02-02 12:39:24 -08:00 committed by Christian Brauner
parent fe3944fb24
commit ea7d898676
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1 changed files with 7 additions and 0 deletions
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7
fs/fcntl.c
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@ -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;
}