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Message-ID: <20240607145902.1137853-11-kernel@pankajraghav.com>
Date: Fri, 7 Jun 2024 14:59:01 +0000
From: "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>
To: david@...morbit.com,
djwong@...nel.org,
chandan.babu@...cle.com,
brauner@...nel.org,
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Cc: mcgrof@...nel.org,
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hare@...e.de,
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yang@...amperecomputing.com,
Zi Yan <zi.yan@...t.com>,
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john.g.garry@...cle.com
Subject: [PATCH v7 10/11] 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 | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 09eef1721ef4..46cb0384143b 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -132,11 +132,19 @@ xfs_sb_validate_fsb_count(
xfs_sb_t *sbp,
uint64_t nblocks)
{
+ uint64_t max_index;
+ 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)
+ max_index = max_bytes >> PAGE_SHIFT;
+
+ if (max_index > ULONG_MAX)
return -EFBIG;
return 0;
}
--
2.44.1
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