Patch "dm thin: fix issue_discard to pass GFP_NOIO to __blkdev_issue_discard" has been added to the 6.1-stable tree

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This is a note to let you know that I've just added the patch titled

    dm thin: fix issue_discard to pass GFP_NOIO to __blkdev_issue_discard

to the 6.1-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:
     dm-thin-fix-issue_discard-to-pass-gfp_noio-to-__blkdev_issue_discard.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 722d90822321497e2837cfc9000202e256e6b32f Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@xxxxxxxxxx>
Date: Tue, 13 Jun 2023 20:05:34 -0400
Subject: dm thin: fix issue_discard to pass GFP_NOIO to __blkdev_issue_discard

From: Mike Snitzer <snitzer@xxxxxxxxxx>

commit 722d90822321497e2837cfc9000202e256e6b32f upstream.

issue_discard() passes GFP_NOWAIT to __blkdev_issue_discard() despite
its code assuming bio_alloc() always succeeds.

Commit 3dba53a958a75 ("dm thin: use __blkdev_issue_discard for async
discard support") clearly shows where things went bad:

Before commit 3dba53a958a75, dm-thin.c's open-coded
__blkdev_issue_discard_async() properly handled using GFP_NOWAIT.
Unfortunately __blkdev_issue_discard() doesn't and it was missed
during review.

Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/md/dm-thin.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -398,8 +398,7 @@ static int issue_discard(struct discard_
 	sector_t s = block_to_sectors(tc->pool, data_b);
 	sector_t len = block_to_sectors(tc->pool, data_e - data_b);
 
-	return __blkdev_issue_discard(tc->pool_dev->bdev, s, len, GFP_NOWAIT,
-				      &op->bio);
+	return __blkdev_issue_discard(tc->pool_dev->bdev, s, len, GFP_NOIO, &op->bio);
 }
 
 static void end_discard(struct discard_op *op, int r)


Patches currently in stable-queue which might be from snitzer@xxxxxxxxxx are

queue-6.1/dm-thin-fix-issue_discard-to-pass-gfp_noio-to-__blkdev_issue_discard.patch
queue-6.1/dm-thin-metadata-check-fail_io-before-using-data_sm.patch



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