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block: reject NOWAIT buffered write fallback

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blkdev_write_iter() rejects NOWAIT buffered writes, but does not
enforce this restriction when direct I/O falls back to buffered I/O.
Successful fallback waits for writeback, violating NOWAIT semantics.

Reject NOWAIT requests in blkdev_buffered_write() with -EAGAIN.

Fixes: c35fc7a5ab ("block_dev: support RFW_NOWAIT on block device nodes")
Signed-off-by: Julian Sun <sunjunchao@bytedance.com>
Link: https://patch.msgid.link/20261015091105.1315605-2-sunjunchao@bytedance.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Julian Sun 2026-10-15 17:11:04 +08:00 committed by Jens Axboe
parent 0f6b042f9a
commit a08bf4b9f8
1 changed files with 4 additions and 0 deletions
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4
block/fops.c
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@ -714,6 +714,10 @@ blkdev_direct_write(struct kiocb *iocb, struct iov_iter *from)
static ssize_t blkdev_buffered_write(struct kiocb *iocb, struct iov_iter *from)
{
/* Buffered fallback waits for writeback, which NOWAIT cannot allow. */
if (iocb->ki_flags & IOCB_NOWAIT)
return -EAGAIN;
return iomap_file_buffered_write(iocb, from, &blkdev_iomap_ops, NULL,
NULL);
}