linux-kernel - [PATCH v11 08/10] xfs: expose block size in stat

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Message-ID: <20240726115956.643538-9-kernel@pankajraghav.com>
Date: Fri, 26 Jul 2024 13:59:54 +0200
From: "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>
To: david@...morbit.com,
	willy@...radead.org,
	chandan.babu@...cle.com,
	djwong@...nel.org,
	brauner@...nel.org,
	akpm@...ux-foundation.org
Cc: yang@...amperecomputing.com,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	john.g.garry@...cle.com,
	linux-fsdevel@...r.kernel.org,
	hare@...e.de,
	p.raghav@...sung.com,
	mcgrof@...nel.org,
	gost.dev@...sung.com,
	cl@...amperecomputing.com,
	linux-xfs@...r.kernel.org,
	kernel@...kajraghav.com,
	ryan.roberts@....com,
	hch@....de,
	Zi Yan <ziy@...dia.com>,
	Dave Chinner <dchinner@...hat.com>
Subject: [PATCH v11 08/10] xfs: expose block size in stat

From: Pankaj Raghav <p.raghav@...sung.com>

For block size larger than page size, the unit of efficient IO is
the block size, not the page size. Leaving stat() to report
PAGE_SIZE as the block size causes test programs like fsx to issue
illegal ranges for operations that require block size alignment
(e.g. fallocate() insert range). Hence update the preferred IO size
to reflect the block size in this case.

This change is based on a patch originally from Dave Chinner.[1]

[1] https://lwn.net/ml/linux-fsdevel/20181107063127.3902-16-david@fromorbit.com/

Signed-off-by: Pankaj Raghav <p.raghav@...sung.com>
Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
Reviewed-by: Darrick J. Wong <djwong@...nel.org>
Reviewed-by: Dave Chinner <dchinner@...hat.com>
---
 fs/xfs/xfs_iops.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 1cdc8034f54d9..6483b4c4cf355 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -567,7 +567,7 @@ xfs_stat_blksize(
 			return 1U << mp->m_allocsize_log;
 	}
 
-	return PAGE_SIZE;
+	return max_t(uint32_t, PAGE_SIZE, mp->m_sb.sb_blocksize);
 }
 
 STATIC int
-- 
2.44.1