linux-kernel - [PATCH v7 2/6] block: sanitize chunk

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Message-ID: <20250711105258.3135198-3-john.g.garry@oracle.com>
Date: Fri, 11 Jul 2025 10:52:54 +0000
From: John Garry <john.g.garry@...cle.com>
To: agk@...hat.com, snitzer@...nel.org, mpatocka@...hat.com, song@...nel.org,
        yukuai3@...wei.com, hch@....de, nilay@...ux.ibm.com, axboe@...nel.dk,
        cem@...nel.org
Cc: dm-devel@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-raid@...r.kernel.org, linux-block@...r.kernel.org,
        ojaswin@...ux.ibm.com, martin.petersen@...cle.com,
        akpm@...ux-foundation.org, linux-xfs@...r.kernel.org,
        djwong@...nel.org, dlemoal@...nel.org,
        John Garry <john.g.garry@...cle.com>
Subject: [PATCH v7 2/6] block: sanitize chunk_sectors for atomic write limits

Currently we just ensure that a non-zero value in chunk_sectors aligns
with any atomic write boundary, as the blk boundary functionality uses
both these values.

However it is also improper to have atomic write unit max > chunk_sectors
(for non-zero chunk_sectors), as this would lead to splitting of atomic
write bios (which is disallowed).

Sanitize atomic write unit max against chunk_sectors to avoid any
potential problems.

Fixes: d00eea91deaf3 ("block: Add extra checks in blk_validate_atomic_write_limits()")
Reviewed-by: Nilay Shroff <nilay@...ux.ibm.com>
Signed-off-by: John Garry <john.g.garry@...cle.com>
---
 block/blk-settings.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/block/blk-settings.c b/block/blk-settings.c
index a000daafbfb48..3425ae1b1f014 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -181,6 +181,8 @@ static void blk_atomic_writes_update_limits(struct queue_limits *lim)
 static void blk_validate_atomic_write_limits(struct queue_limits *lim)
 {
 	unsigned int boundary_sectors;
+	unsigned int atomic_write_hw_max_sectors =
+			lim->atomic_write_hw_max >> SECTOR_SHIFT;
 
 	if (!(lim->features & BLK_FEAT_ATOMIC_WRITES))
 		goto unsupported;
@@ -202,6 +204,10 @@ static void blk_validate_atomic_write_limits(struct queue_limits *lim)
 			 lim->atomic_write_hw_max))
 		goto unsupported;
 
+	if (WARN_ON_ONCE(lim->chunk_sectors &&
+			atomic_write_hw_max_sectors > lim->chunk_sectors))
+		goto unsupported;
+
 	boundary_sectors = lim->atomic_write_hw_boundary >> SECTOR_SHIFT;
 
 	if (boundary_sectors) {
-- 
2.43.5