xfs: fix integer overflow in deferred intent sort comparators

xfs_extent_free_diff_items(), xfs_refcount_update_diff_items(), and
xfs_rmap_update_diff_items() subtract two uint32_t group numbers
and return the result as int, which can overflow when the difference
exceeds INT_MAX.

Use cmp_int() instead, as was done in commit 362c490 ("xfs:
fix integer overflow in bmap intent sort comparator").

Fixes: c13418e ("xfs: give xfs_rmap_intent its own perag reference")
Fixes: f6b3846 ("xfs: give xfs_extfree_intent its own perag reference")
Fixes: 00e7b3b ("xfs: give xfs_refcount_intent its own perag reference")
Signed-off-by: Yuto Ohnuki <ytohnuki@amazon.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

Author: Yuto Ohnuki

fs/xfs/xfs_extfree_item.c

@@ -387,7 +387,7 @@ xfs_extent_free_diff_items(
 	struct xfs_extent_free_item	*ra = xefi_entry(a);
 	struct xfs_extent_free_item	*rb = xefi_entry(b);
 
-	return ra->xefi_group->xg_gno - rb->xefi_group->xg_gno;
+	return cmp_int(ra->xefi_group->xg_gno, rb->xefi_group->xg_gno);
 }
 
 /* Log a free extent to the intent item. */

fs/xfs/xfs_refcount_item.c

@@ -266,7 +266,7 @@ xfs_refcount_update_diff_items(
 	struct xfs_refcount_intent	*ra = ci_entry(a);
 	struct xfs_refcount_intent	*rb = ci_entry(b);
 
-	return ra->ri_group->xg_gno - rb->ri_group->xg_gno;
+	return cmp_int(ra->ri_group->xg_gno, rb->ri_group->xg_gno);
 }
 
 /* Log refcount updates in the intent item. */

fs/xfs/xfs_rmap_item.c

@@ -267,7 +267,7 @@ xfs_rmap_update_diff_items(
 	struct xfs_rmap_intent		*ra = ri_entry(a);
 	struct xfs_rmap_intent		*rb = ri_entry(b);
 
-	return ra->ri_group->xg_gno - rb->ri_group->xg_gno;
+	return cmp_int(ra->ri_group->xg_gno, rb->ri_group->xg_gno);
 }
 
 /* Log rmap updates in the intent item. */