linux-kernel - [RFC PATCH 8/8] xfs: Lift the bs == ps restriction for HW buffered atomic writes

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Message-ID: <0f1f53d6fad8c25118b0348b0cb91dc2e4ecf456.1762945505.git.ojaswin@linux.ibm.com>
Date: Wed, 12 Nov 2025 16:36:11 +0530
From: Ojaswin Mujoo <ojaswin@...ux.ibm.com>
To: Christian Brauner <brauner@...nel.org>, djwong@...nel.org,
        ritesh.list@...il.com, john.g.garry@...cle.com, tytso@....edu,
        willy@...radead.org, dchinner@...hat.com, hch@....de
Cc: linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, jack@...e.cz, nilay@...ux.ibm.com,
        martin.petersen@...cle.com, rostedt@...dmis.org, axboe@...nel.dk,
        linux-block@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Subject: [RFC PATCH 8/8] xfs: Lift the bs == ps restriction for HW buffered atomic writes

Now that we support bs < ps for HW atomic writes, lift this restirction from XFS
statx reporting

Signed-off-by: Ojaswin Mujoo <ojaswin@...ux.ibm.com>
---
 fs/xfs/xfs_iops.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 67d370947d95..5bd31aacf514 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -622,10 +622,9 @@ xfs_get_atomic_write_min(
 			return bs;
 	}
 	/*
-	 * Buffered IO only supports hw single block atomic writes and bs == ps
-	 * configurations.
+	 * Buffered IO only supports hw single block atomic writes
 	 */
-	if (xfs_inode_can_hw_atomic_write(ip) && bs == PAGE_SIZE)
+	if (xfs_inode_can_hw_atomic_write(ip))
 		return bs;
 
 	return 0;
@@ -661,10 +660,9 @@ xfs_get_atomic_write_max(
 		return XFS_FSB_TO_B(mp, mp->m_groups[XG_TYPE_AG].awu_max);
 	}
 	/*
-	 * Buffered IO only supports hw single block atomic writes and bs == ps
-	 * configurations.
+	 * Buffered IO only supports hw single block atomic writes
 	 */
-	if (xfs_inode_can_hw_atomic_write(ip) && bs == PAGE_SIZE)
+	if (xfs_inode_can_hw_atomic_write(ip))
 		return bs;
 
 	return 0;
-- 
2.51.0