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authorStefan Roesch <shr@fb.com>2022-06-23 10:51:50 -0700
committerJens Axboe <axboe@kernel.dk>2022-07-24 18:39:31 -0600
commit8017553980d0bbfef3e66c583363828565afd6da (patch)
treec02bf0bc996e1ba246d94070b937f727109ac9a0
parent18e419f6e80a6d3c8aaab94abd55c3b41741d8df (diff)
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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 <shr@fb.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Christian Brauner (Microsoft) <brauner@kernel.org> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Link: https://lore.kernel.org/r/20220623175157.1715274-8-shr@fb.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--fs/read_write.c4
-rw-r--r--include/linux/fs.h3
2 files changed, 6 insertions, 1 deletions
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);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 9ad5e3520fae..bc84847c201e 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -180,6 +180,9 @@ typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
/* File supports async buffered reads */
#define FMODE_BUF_RASYNC ((__force fmode_t)0x40000000)
+/* File supports async nowait buffered writes */
+#define FMODE_BUF_WASYNC ((__force fmode_t)0x80000000)
+
/*
* Attribute flags. These should be or-ed together to figure out what
* has been changed!