Re: [PATCH 09/11] block: bypass the STABLE_WRITES flag for protection information

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On 6/7/24 07:59, Christoph Hellwig wrote:
Currently registering a checksum-enabled (aka PI) integrity profile sets
the QUEUE_FLAG_STABLE_WRITE flag, and unregistering it clears the flag.
This can incorrectly clear the flag when the driver requires stable
writes even without PI, e.g. in case of iSCSI or NVMe/TCP with data
digest enabled.

Fix this by looking at the csum_type directly in bdev_stable_writes and
not setting the queue flag.  Also remove the blk_queue_stable_writes
helper as the only user in nvme wants to only look at the actual
QUEUE_FLAG_STABLE_WRITE flag as it inherits the integrity configuration
by other means.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
  block/blk-integrity.c         |  6 ------
  drivers/nvme/host/multipath.c |  3 ++-
  include/linux/blkdev.h        | 12 ++++++++----
  3 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/block/blk-integrity.c b/block/blk-integrity.c
index 1d2d371cd632d3..bec0d1df387ce9 100644
--- a/block/blk-integrity.c
+++ b/block/blk-integrity.c
@@ -379,9 +379,6 @@ void blk_integrity_register(struct gendisk *disk, struct blk_integrity *template
  	bi->tag_size = template->tag_size;
  	bi->pi_offset = template->pi_offset;
- if (bi->csum_type != BLK_INTEGRITY_CSUM_NONE)
-		blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, disk->queue);
-
  #ifdef CONFIG_BLK_INLINE_ENCRYPTION
  	if (disk->queue->crypto_profile) {
  		pr_warn("blk-integrity: Integrity and hardware inline encryption are not supported together. Disabling hardware inline encryption.\n");
@@ -404,9 +401,6 @@ void blk_integrity_unregister(struct gendisk *disk)
if (!bi->tuple_size)
  		return;
-
-	if (bi->csum_type != BLK_INTEGRITY_CSUM_NONE)
-		blk_queue_flag_clear(QUEUE_FLAG_STABLE_WRITES, disk->queue);
  	memset(bi, 0, sizeof(*bi));
  }
  EXPORT_SYMBOL(blk_integrity_unregister);
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index d8b6b4648eaff9..12c59db02539e5 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -875,7 +875,8 @@ void nvme_mpath_add_disk(struct nvme_ns *ns, __le32 anagrpid)
  		nvme_mpath_set_live(ns);
  	}
- if (blk_queue_stable_writes(ns->queue) && ns->head->disk)
+	if (test_bit(QUEUE_FLAG_STABLE_WRITES, &ns->queue->queue_flags) &&
+	    ns->head->disk)
  		blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES,
  				   ns->head->disk->queue);
  #ifdef CONFIG_BLK_DEV_ZONED
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index bdd33388e1ced8..f9089750919c6b 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -571,8 +571,6 @@ bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
  #define blk_queue_noxmerges(q)	\
  	test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
  #define blk_queue_nonrot(q)	test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
-#define blk_queue_stable_writes(q) \
-	test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags)
  #define blk_queue_io_stat(q)	test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
  #define blk_queue_add_random(q)	test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
  #define blk_queue_zone_resetall(q)	\
@@ -1300,8 +1298,14 @@ static inline bool bdev_synchronous(struct block_device *bdev)
static inline bool bdev_stable_writes(struct block_device *bdev)
  {
-	return test_bit(QUEUE_FLAG_STABLE_WRITES,
-			&bdev_get_queue(bdev)->queue_flags);
+	struct request_queue *q = bdev_get_queue(bdev);
+
+#ifdef CONFIG_BLK_DEV_INTEGRITY
+	/* BLK_INTEGRITY_CSUM_NONE is not available in blkdev.h */
+	if (q->integrity.csum_type != 0)
+		return true;
+#endif
+	return test_bit(QUEUE_FLAG_STABLE_WRITES, &q->queue_flags);
  }
static inline bool bdev_write_cache(struct block_device *bdev)

Reviewed-by: Hannes Reinecke <hare@xxxxxxx>

Cheers,

Hannes
--
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@xxxxxxx                                +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich





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