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FAILED: patch "[PATCH] dm-crypt: don't update io->sector after" failed to apply to 5.4-stable tree

PATCH [email protected] 1 participant 1 message Feb 10, 2025

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The patch below does not apply to the 5.4-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-5.4.y
git checkout FETCH_HEAD
git cherry-pick -x 9fdbbdbbc92b1474a87b89f8b964892a63734492
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2025021037-walk-outmatch-5872@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

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

From 9fdbbdbbc92b1474a87b89f8b964892a63734492 Mon Sep 17 00:00:00 2001
From: Hou Tao <[email protected]>
Date: Mon, 20 Jan 2025 16:29:49 +0800
Subject: [PATCH] dm-crypt: don't update io->sector after
kcryptd_crypt_write_io_submit()

The updates of io->sector are the leftovers when dm-crypt allocated pages for partial write request. However, since commit cf2f1abfbd0db ("dm crypt: don't allocate pages for a partial request"), there is no partial request anymore.

After the introduction of write request rb-tree, the updates of io->sectors may interfere the insertion procedure, because ->sectors of these write requests which have already been added in the rb-tree may be changed during the insertion of new write request.

Fix it by removing these buggy updates of io->sectors. Considering these updates only effect the write request rb-tree, the commit which introduces the write request rb-tree is used as the fix tag.

Fixes b3c5fd305249 ("dm crypt: sort writes")
Cc [email protected]
Signed-off-by Hou Tao <[email protected]>
Signed-off-by Mikulas Patocka <[email protected]>
drivers/md/dm-crypt.c +3 -11
index 8a4c24d4ee02..605859ef01b5 100644
@@ -2090,7 +2090,6 @@ static void kcryptd_crypt_write_continue(struct work_struct *work)
 	struct crypt_config *cc = io->cc;
 	struct convert_context *ctx = &io->ctx;
 	int crypt_finished;
-	sector_t sector = io->sector;
 	blk_status_t r;
 
 	wait_for_completion(&ctx->restart);

@@ -2107,10 +2106,8 @@ static void kcryptd_crypt_write_continue(struct work_struct *work)
 	}
 
 	/* Encryption was already finished, submit io now */
-	if (crypt_finished) {
+	if (crypt_finished)
 		kcryptd_crypt_write_io_submit(io, 0);
-		io->sector = sector;
-	}
 
 	crypt_dec_pending(io);
 }

@@ -2121,14 +2118,13 @@ static void kcryptd_crypt_write_convert(struct dm_crypt_io *io)
 	struct convert_context *ctx = &io->ctx;
 	struct bio *clone;
 	int crypt_finished;
-	sector_t sector = io->sector;
 	blk_status_t r;
 
 	/*
 	 * Prevent io from disappearing until this function completes.
 	 */
 	crypt_inc_pending(io);
-	crypt_convert_init(cc, ctx, NULL, io->base_bio, sector);
+	crypt_convert_init(cc, ctx, NULL, io->base_bio, io->sector);
 
 	clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size);
 	if (unlikely(!clone)) {

@@ -2145,8 +2141,6 @@ static void kcryptd_crypt_write_convert(struct dm_crypt_io *io)
 		io->ctx.iter_in = clone->bi_iter;
 	}
 
-	sector += bio_sectors(clone);
-
 	crypt_inc_pending(io);
 	r = crypt_convert(cc, ctx,
 			  test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags), true);

@@ -2170,10 +2164,8 @@ static void kcryptd_crypt_write_convert(struct dm_crypt_io *io)
 	}
 
 	/* Encryption was already finished, submit io now */
-	if (crypt_finished) {
+	if (crypt_finished)
 		kcryptd_crypt_write_io_submit(io, 0);
-		io->sector = sector;
-	}
 
 dec:
 	crypt_dec_pending(io);