From 8017553980d0bbfef3e66c583363828565afd6da Mon Sep 17 00:00:00 2001 From: Stefan Roesch Date: Thu, 23 Jun 2022 10:51:50 -0700 Subject: fs: add a FMODE_BUF_WASYNC flags for f_mode This introduces the flag FMODE_BUF_WASYNC. If devices support async buffered writes, this flag can be set. It also modifies the check in generic_write_checks to take async buffered writes into consideration. Signed-off-by: Stefan Roesch Reviewed-by: Christoph Hellwig Reviewed-by: Christian Brauner (Microsoft) Reviewed-by: Darrick J. Wong Link: https://lore.kernel.org/r/20220623175157.1715274-8-shr@fb.com Signed-off-by: Jens Axboe --- fs/read_write.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'fs') diff --git a/fs/read_write.c b/fs/read_write.c index e0777eefd846..319d88825d1c 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -1660,7 +1660,9 @@ int generic_write_checks_count(struct kiocb *iocb, loff_t *count) if (iocb->ki_flags & IOCB_APPEND) iocb->ki_pos = i_size_read(inode); - if ((iocb->ki_flags & IOCB_NOWAIT) && !(iocb->ki_flags & IOCB_DIRECT)) + if ((iocb->ki_flags & IOCB_NOWAIT) && + !((iocb->ki_flags & IOCB_DIRECT) || + (file->f_mode & FMODE_BUF_WASYNC))) return -EINVAL; return generic_write_check_limits(iocb->ki_filp, iocb->ki_pos, count); -- cgit