linux-kernel - [PATCH v8 09/10] xfs: make the calculation generic in xfs_sb_validate_fsb

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Date: Tue, 25 Jun 2024 11:44:19 +0000
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: linux-kernel@...r.kernel.org,
	yang@...amperecomputing.com,
	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,
	hch@....de,
	Zi Yan <zi.yan@...t.com>
Subject: [PATCH v8 09/10] xfs: make the calculation generic in xfs_sb_validate_fsb_count()

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

Instead of assuming that PAGE_SHIFT is always higher than the blocklog,
make the calculation generic so that page cache count can be calculated
correctly for LBS.

Reviewed-by: Darrick J. Wong <djwong@...nel.org>
Signed-off-by: Pankaj Raghav <p.raghav@...sung.com>
---
 fs/xfs/xfs_mount.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 09eef1721ef4..3949f720b535 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -132,11 +132,16 @@ xfs_sb_validate_fsb_count(
 	xfs_sb_t	*sbp,
 	uint64_t	nblocks)
 {
+	uint64_t		max_bytes;
+
 	ASSERT(PAGE_SHIFT >= sbp->sb_blocklog);
 	ASSERT(sbp->sb_blocklog >= BBSHIFT);
 
+	if (check_shl_overflow(nblocks, sbp->sb_blocklog, &max_bytes))
+		return -EFBIG;
+
 	/* Limited by ULONG_MAX of page cache index */
-	if (nblocks >> (PAGE_SHIFT - sbp->sb_blocklog) > ULONG_MAX)
+	if (max_bytes >> PAGE_SHIFT > ULONG_MAX)
 		return -EFBIG;
 	return 0;
 }
-- 
2.44.1