This is a note to let you know that I've just added the patch titled
virtio_pmem: add the missing REQ_OP_WRITE for flush bio
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
virtio_pmem-add-the-missing-req_op_write-for-flush-bio.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c1dbd8a849183b9c12d257ad3043ecec50db50b3 Mon Sep 17 00:00:00 2001
From: Hou Tao <houtao1@xxxxxxxxxx>
Date: Thu, 13 Jul 2023 21:54:13 +0800
Subject: virtio_pmem: add the missing REQ_OP_WRITE for flush bio
From: Hou Tao <houtao1@xxxxxxxxxx>
commit c1dbd8a849183b9c12d257ad3043ecec50db50b3 upstream.
When doing mkfs.xfs on a pmem device, the following warning was
reported:
------------[ cut here ]------------
WARNING: CPU: 2 PID: 384 at block/blk-core.c:751 submit_bio_noacct
Modules linked in:
CPU: 2 PID: 384 Comm: mkfs.xfs Not tainted 6.4.0-rc7+ #154
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)
RIP: 0010:submit_bio_noacct+0x340/0x520
......
Call Trace:
<TASK>
? submit_bio_noacct+0xd5/0x520
submit_bio+0x37/0x60
async_pmem_flush+0x79/0xa0
nvdimm_flush+0x17/0x40
pmem_submit_bio+0x370/0x390
__submit_bio+0xbc/0x190
submit_bio_noacct_nocheck+0x14d/0x370
submit_bio_noacct+0x1ef/0x520
submit_bio+0x55/0x60
submit_bio_wait+0x5a/0xc0
blkdev_issue_flush+0x44/0x60
The root cause is that submit_bio_noacct() needs bio_op() is either
WRITE or ZONE_APPEND for flush bio and async_pmem_flush() doesn't assign
REQ_OP_WRITE when allocating flush bio, so submit_bio_noacct just fail
the flush bio.
Simply fix it by adding the missing REQ_OP_WRITE for flush bio. And we
could fix the flush order issue and do flush optimization later.
Cc: stable@xxxxxxxxxxxxxxx # 6.3+
Fixes: b4a6bb3a67aa ("block: add a sanity check for non-write flush/fua bios")
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Chaitanya Kulkarni <kch@xxxxxxxxxx>
Reviewed-by: Pankaj Gupta <pankaj.gupta@xxxxxxx>
Tested-by: Pankaj Gupta <pankaj.gupta@xxxxxxx>
Signed-off-by: Hou Tao <houtao1@xxxxxxxxxx>
Signed-off-by: Dave Jiang <dave.jiang@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/nvdimm/nd_virtio.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/nvdimm/nd_virtio.c b/drivers/nvdimm/nd_virtio.c
index c6a648fd8744..1f8c667c6f1e 100644
--- a/drivers/nvdimm/nd_virtio.c
+++ b/drivers/nvdimm/nd_virtio.c
@@ -105,7 +105,8 @@ int async_pmem_flush(struct nd_region *nd_region, struct bio *bio)
* parent bio. Otherwise directly call nd_region flush.
*/
if (bio && bio->bi_iter.bi_sector != -1) {
- struct bio *child = bio_alloc(bio->bi_bdev, 0, REQ_PREFLUSH,
+ struct bio *child = bio_alloc(bio->bi_bdev, 0,
+ REQ_OP_WRITE | REQ_PREFLUSH,
GFP_ATOMIC);
if (!child)
--
2.42.0
Patches currently in stable-queue which might be from houtao1@xxxxxxxxxx are
queue-6.4/virtio_pmem-add-the-missing-req_op_write-for-flush-bio.patch
