XFS_FILBLKS_MIN uses min_t and thus does the comparison using the correct
xfs_filblks_t type. Use it in xfs_bmapi_write and slightly adjust the
comment document th potential pitfall to take account of this
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
fs/xfs/libxfs/xfs_bmap.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index 3b5816de4af2a1..f2e934c2fb423c 100644
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -4537,14 +4537,11 @@ xfs_bmapi_write(
* allocation length request (which can be 64 bits in
* length) and the bma length request, which is
* xfs_extlen_t and therefore 32 bits. Hence we have to
- * check for 32-bit overflows and handle them here.
+ * be careful and do the min() using the larger type to
+ * avoid overflows.
*/
- if (len > (xfs_filblks_t)XFS_MAX_BMBT_EXTLEN)
- bma.length = XFS_MAX_BMBT_EXTLEN;
- else
- bma.length = len;
+ bma.length = XFS_FILBLKS_MIN(len, XFS_MAX_BMBT_EXTLEN);
- ASSERT(len > 0);
ASSERT(bma.length > 0);
error = xfs_bmapi_allocate(&bma);
if (error) {
--
2.39.2
