linux-kernel - [PATCH v6 09/11] xfs: expose block size in stat

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20240529134509.120826-10-kernel@pankajraghav.com>
Date: Wed, 29 May 2024 15:45:07 +0200
From: "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>
To: david@...morbit.com,
	chandan.babu@...cle.com,
	akpm@...ux-foundation.org,
	brauner@...nel.org,
	willy@...radead.org,
	djwong@...nel.org
Cc: linux-kernel@...r.kernel.org,
	hare@...e.de,
	john.g.garry@...cle.com,
	gost.dev@...sung.com,
	yang@...amperecomputing.com,
	p.raghav@...sung.com,
	cl@...amperecomputing.com,
	linux-xfs@...r.kernel.org,
	hch@....de,
	mcgrof@...nel.org,
	linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org
Subject: [PATCH v6 09/11] 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/

Reviewed-by: Darrick J. Wong <djwong@...nel.org>
Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
Signed-off-by: Pankaj Raghav <p.raghav@...sung.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 ff222827e550..a7883303dee8 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -560,7 +560,7 @@ 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
-- 
2.34.1