From: Pankaj Raghav <p.raghav@xxxxxxxxxxx>
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@xxxxxxxxxxx>
---
fs/xfs/xfs_mount.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index aabb25dc3efa..69af3b06be99 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -133,9 +133,15 @@ xfs_sb_validate_fsb_count(
{
ASSERT(PAGE_SHIFT >= sbp->sb_blocklog);
ASSERT(sbp->sb_blocklog >= BBSHIFT);
+ uint64_t mapping_count;
+ uint64_t bytes;
+ if (check_mul_overflow(nblocks, (1 << sbp->sb_blocklog), &bytes))
+ return -EFBIG;
+
+ mapping_count = bytes >> PAGE_SHIFT;
/* Limited by ULONG_MAX of page cache index */
- if (nblocks >> (PAGE_SHIFT - sbp->sb_blocklog) > ULONG_MAX)
+ if (mapping_count > ULONG_MAX)
return -EFBIG;
return 0;
}
--
2.43.0
