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xfs: make the calculation generic in xfs_sb_validate_fsb_count()

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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>
Link: https://lore.kernel.org/r/20240822135018.1931258-10-kernel@pankajraghav.com
Acked-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Daniel Gomez <da.gomez@samsung.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Pankaj Raghav 2024-08-22 15:50:17 +02:00 committed by Christian Brauner
parent 79012cfa00
commit cebf9dacd5
1 changed files with 6 additions and 1 deletions
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7
fs/xfs/xfs_mount.c
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@ -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;
}