FAILED: patch "[PATCH] dm-integrity: require stable writes for internal hash modes" failed to apply to 6.1-stable tree

The patch below does not apply to the 6.1-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y
git checkout FETCH_HEAD
git cherry-pick -x b2fd92f016e9d692fd3c8c08d0ee014e9212279d
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026102132-liver-overdraft-11ac@gregkh' --subject-prefix 'PATCH 6.1.y' 'HEAD^..'

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From b2fd92f016e9d692fd3c8c08d0ee014e9212279d Mon Sep 17 00:00:00 2001
From: Chen Cheng <[email protected]>
Date: Mon, 24 Aug 2026 19:34:49 +0800
Subject: [PATCH] dm-integrity: require stable writes for internal hash modes

dm-integrity direct, bitmap and inline internal-hash modes compute integrity tags from the pages carried by the write bio. The lower data write also uses those pages, so the tag and the data write depend on the same memory contents staying unchanged while writeback is in flight.

Without stable writes, a buffered writer can modify a writeback folio after dm-integrity has submitted the data bio and before the lower device has consumed the data. After a crash, this can leave data from the later contents with a tag calculated from the earlier contents, causing permanent checksum failures on read.

Set BLK_FEAT_STABLE_WRITES for internal-hash D, B and I modes so filesystems wait for writeback folios to become stable before modifying them again. Journal mode is left unchanged because it copies data into the journal before computing and persisting the tag.

Tested using dm-delay over a virtio-blk test disk, dm-integrity internal_hash:crc32c and no-journal ext4. The D and B reproducers both failed with checksum errors before this change and completed with READ_RC=0 and zero mismatches after it.

index c50feaa98bf9..0370d7d7ce72 100644
@@ -4130,6 +4130,10 @@ static void dm_integrity_io_hints(struct dm_target *ti, struct queue_limits *lim
 	limits->dma_alignment = limits->logical_block_size - 1;
 	limits->discard_granularity = ic->sectors_per_block << SECTOR_SHIFT;
 
+	if (ic->internal_hash &&
+	    (ic->mode == 'D' || ic->mode == 'B' || ic->mode == 'I'))
+		limits->features |= BLK_FEAT_STABLE_WRITES;
+
 	if (!ic->internal_hash) {
 		struct blk_integrity *bi = &limits->integrity;
 

From: Chen Cheng <[email protected]>

[ Upstream commit b2fd92f016e9d692fd3c8c08d0ee014e9212279d ]

dm-integrity direct, bitmap and inline internal-hash modes compute integrity tags from the pages carried by the write bio. The lower data write also uses those pages, so the tag and the data write depend on the same memory contents staying unchanged while writeback is in flight.

Without stable writes, a buffered writer can modify a writeback folio after dm-integrity has submitted the data bio and before the lower device has consumed the data. After a crash, this can leave data from the later contents with a tag calculated from the earlier contents, causing permanent checksum failures on read.

Set BLK_FEAT_STABLE_WRITES for internal-hash D, B and I modes so filesystems wait for writeback folios to become stable before modifying them again. Journal mode is left unchanged because it copies data into the journal before computing and persisting the tag.

Tested using dm-delay over a virtio-blk test disk, dm-integrity internal_hash:crc32c and no-journal ext4. The D and B reproducers both failed with checksum errors before this change and completed with READ_RC=0 and zero mismatches after it.

---
 drivers/md/dm-integrity.c     | 3 +++
 drivers/md/dm-table.c         | 2 +-
 include/linux/device-mapper.h | 5 +++++
 3 files changed, 9 insertions(+), 1 deletion(-)

index f552c402b3c17..4fcd7d821568f 100644
@@ -3503,6 +3503,9 @@ static void dm_integrity_io_hints(struct dm_target *ti, struct queue_limits *lim
 		blk_limits_io_min(limits, ic->sectors_per_block << SECTOR_SHIFT);
 		limits->dma_alignment = limits->logical_block_size - 1;
 	}
+
+	if (ic->internal_hash && (ic->mode == 'D' || ic->mode == 'B'))
+		ti->needs_stable_writes = true;
 }
 
 static void calculate_journal_section_size(struct dm_integrity_c *ic)

index 8e0b9783f3da3..214a7af330f89 100644
@@ -1941,7 +1941,7 @@ static int device_requires_stable_pages(struct dm_target *ti,
 					struct dm_dev *dev, sector_t start,
 					sector_t len, void *data)
 {
-	return bdev_stable_writes(dev->bdev);
+	return ti->needs_stable_writes || bdev_stable_writes(dev->bdev);
 }
 
 int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,

index 9505674dc883d..bda8f373c91b6 100644
@@ -357,6 +357,11 @@ struct dm_target {
 	 */
 	bool discards_supported:1;
 
+	/*
+	 * Set if this target requires stable data during writeback.
+	 */
+	bool needs_stable_writes:1;
+
 	/*
 	 * Set if we need to limit the number of in-flight bios when swapping.
 	 */

2.53.0