xfs: constify btree function parameters that are not modified

Constify the rest of the btree functions that take structure and union
pointers and are not supposed to modify them.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>

fs/xfs/libxfs/xfs_btree.c

@@ -226,7 +226,7 @@ xfs_btree_check_sptr(
 static int
 xfs_btree_check_ptr(
 	struct xfs_btree_cur		*cur,
-	union xfs_btree_ptr	*ptr,
+	const union xfs_btree_ptr	*ptr,
 	int				index,
 	int				level)
 {
@@ -936,7 +936,7 @@ xfs_btree_readahead(
 STATIC int
 xfs_btree_ptr_to_daddr(
 	struct xfs_btree_cur		*cur,
-	union xfs_btree_ptr	*ptr,
+	const union xfs_btree_ptr	*ptr,
 	xfs_daddr_t			*daddr)
 {
 	xfs_fsblock_t		fsbno;
@@ -1013,7 +1013,7 @@ xfs_btree_setbuf(
 bool
 xfs_btree_ptr_is_null(
 	struct xfs_btree_cur		*cur,
-	union xfs_btree_ptr	*ptr)
+	const union xfs_btree_ptr	*ptr)
 {
 	if (cur->bc_flags & XFS_BTREE_LONG_PTRS)
 		return ptr->l == cpu_to_be64(NULLFSBLOCK);
@@ -1061,7 +1061,7 @@ void
 xfs_btree_set_sibling(
 	struct xfs_btree_cur		*cur,
 	struct xfs_btree_block		*block,
-	union xfs_btree_ptr	*ptr,
+	const union xfs_btree_ptr	*ptr,
 	int				lr)
 {
 	ASSERT(lr == XFS_BB_LEFTSIB || lr == XFS_BB_RIGHTSIB);
@@ -1230,7 +1230,7 @@ xfs_btree_set_refs(
 int
 xfs_btree_get_buf_block(
 	struct xfs_btree_cur		*cur,
-	union xfs_btree_ptr	*ptr,
+	const union xfs_btree_ptr	*ptr,
 	struct xfs_btree_block		**block,
 	struct xfs_buf			**bpp)
 {
@@ -1258,7 +1258,7 @@ xfs_btree_get_buf_block(
 STATIC int
 xfs_btree_read_buf_block(
 	struct xfs_btree_cur		*cur,
-	union xfs_btree_ptr	*ptr,
+	const union xfs_btree_ptr	*ptr,
 	int				flags,
 	struct xfs_btree_block		**block,
 	struct xfs_buf			**bpp)
@@ -1291,7 +1291,7 @@ void
 xfs_btree_copy_keys(
 	struct xfs_btree_cur		*cur,
 	union xfs_btree_key		*dst_key,
-	union xfs_btree_key	*src_key,
+	const union xfs_btree_key	*src_key,
 	int				numkeys)
 {
 	ASSERT(numkeys >= 0);
@@ -1715,7 +1715,7 @@ int
 xfs_btree_lookup_get_block(
 	struct xfs_btree_cur		*cur,	/* btree cursor */
 	int				level,	/* level in the btree */
-	union xfs_btree_ptr	*pp,	/* ptr to btree block */
+	const union xfs_btree_ptr	*pp,	/* ptr to btree block */
 	struct xfs_btree_block		**blkp) /* return btree block */
 {
 	struct xfs_buf		*bp;	/* buffer pointer for btree block */
@@ -4887,8 +4887,8 @@ xfs_btree_has_record_helper(
 int
 xfs_btree_has_record(
 	struct xfs_btree_cur		*cur,
-	union xfs_btree_irec	*low,
-	union xfs_btree_irec	*high,
+	const union xfs_btree_irec	*low,
+	const union xfs_btree_irec	*high,
 	bool				*exists)
 {
 	int				error;

fs/xfs/libxfs/xfs_btree.h

@@ -503,10 +503,11 @@ union xfs_btree_key *xfs_btree_high_key_addr(struct xfs_btree_cur *cur, int n,
 union xfs_btree_ptr *xfs_btree_ptr_addr(struct xfs_btree_cur *cur, int n,
 		struct xfs_btree_block *block);
 int xfs_btree_lookup_get_block(struct xfs_btree_cur *cur, int level,
-		union xfs_btree_ptr *pp, struct xfs_btree_block **blkp);
+		const union xfs_btree_ptr *pp, struct xfs_btree_block **blkp);
 struct xfs_btree_block *xfs_btree_get_block(struct xfs_btree_cur *cur,
 		int level, struct xfs_buf **bpp);
-bool xfs_btree_ptr_is_null(struct xfs_btree_cur *cur, union xfs_btree_ptr *ptr);
+bool xfs_btree_ptr_is_null(struct xfs_btree_cur *cur,
+		const union xfs_btree_ptr *ptr);
 int64_t xfs_btree_diff_two_ptrs(struct xfs_btree_cur *cur,
 				const union xfs_btree_ptr *a,
 				const union xfs_btree_ptr *b);
@@ -517,8 +518,9 @@ void xfs_btree_get_keys(struct xfs_btree_cur *cur,
 		struct xfs_btree_block *block, union xfs_btree_key *key);
 union xfs_btree_key *xfs_btree_high_key_from_key(struct xfs_btree_cur *cur,
 		union xfs_btree_key *key);
-int xfs_btree_has_record(struct xfs_btree_cur *cur, union xfs_btree_irec *low,
-		union xfs_btree_irec *high, bool *exists);
+int xfs_btree_has_record(struct xfs_btree_cur *cur,
+		const union xfs_btree_irec *low,
+		const union xfs_btree_irec *high, bool *exists);
 bool xfs_btree_has_more_records(struct xfs_btree_cur *cur);
 struct xfs_ifork *xfs_btree_ifork_ptr(struct xfs_btree_cur *cur);
 
@@ -541,10 +543,11 @@ xfs_btree_islastblock(
 
 void xfs_btree_set_ptr_null(struct xfs_btree_cur *cur,
 		union xfs_btree_ptr *ptr);
-int xfs_btree_get_buf_block(struct xfs_btree_cur *cur, union xfs_btree_ptr *ptr,
-		struct xfs_btree_block **block, struct xfs_buf **bpp);
+int xfs_btree_get_buf_block(struct xfs_btree_cur *cur,
+		const union xfs_btree_ptr *ptr, struct xfs_btree_block **block,
+		struct xfs_buf **bpp);
 void xfs_btree_set_sibling(struct xfs_btree_cur *cur,
-		struct xfs_btree_block *block, union xfs_btree_ptr *ptr,
+		struct xfs_btree_block *block, const union xfs_btree_ptr *ptr,
 		int lr);
 void xfs_btree_init_block_cur(struct xfs_btree_cur *cur,
 		struct xfs_buf *bp, int level, int numrecs);
@@ -552,7 +555,7 @@ void xfs_btree_copy_ptrs(struct xfs_btree_cur *cur,
 		union xfs_btree_ptr *dst_ptr,
 		const union xfs_btree_ptr *src_ptr, int numptrs);
 void xfs_btree_copy_keys(struct xfs_btree_cur *cur,
-		union xfs_btree_key *dst_key, union xfs_btree_key *src_key,
-		int numkeys);
+		union xfs_btree_key *dst_key,
+		const union xfs_btree_key *src_key, int numkeys);
 
 #endif	/* __XFS_BTREE_H__ */