diff mbox series

[v2,12/13] xfs: make the calculation generic in xfs_sb_validate_fsb_count()

Message ID 20240301164444.3799288-13-kernel@pankajraghav.com (mailing list archive)
State Superseded
Headers show
Series enable bs > ps in XFS | expand

Commit Message

Pankaj Raghav (Samsung) March 1, 2024, 4:44 p.m. UTC 
From: Pankaj Raghav <p.raghav@samsung.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.

Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
---
 fs/xfs/xfs_mount.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index aabb25dc3efa..9cf800586da7 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -133,9 +133,16 @@  xfs_sb_validate_fsb_count(
 {
 	ASSERT(PAGE_SHIFT >= sbp->sb_blocklog);
 	ASSERT(sbp->sb_blocklog >= BBSHIFT);
+	uint64_t max_index;
+	uint64_t max_bytes;
+
+	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;
 }