xfs: make the start pointer passed to btree update_lastrec functions const

This btree function is called when updating a record in the rightmost
block of a btree so that we can update the AGF's longest free extent
length field.  Neither parameter is supposed to be updated, so mark them
both const.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>

diff --git a/fs/xfs/libxfs/xfs_alloc_btree.c b/fs/xfs/libxfs/xfs_alloc_btree.c
index 0b9303c..26480ca 100644 (file)
--- a/fs/xfs/libxfs/xfs_alloc_btree.c
+++ b/fs/xfs/libxfs/xfs_alloc_btree.c
@@ -103,11 +103,11 @@ xfs_allocbt_free_block(
  */
 STATIC void
 xfs_allocbt_update_lastrec(
-       struct xfs_btree_cur    *cur,
-       struct xfs_btree_block  *block,
-       union xfs_btree_rec     *rec,
-       int                     ptr,
-       int                     reason)
+       struct xfs_btree_cur            *cur,
+       const struct xfs_btree_block    *block,
+       const union xfs_btree_rec       *rec,
+       int                             ptr,
+       int                             reason)
 {
        struct xfs_agf          *agf = cur->bc_ag.agbp->b_addr;
        struct xfs_perag        *pag;

diff --git a/fs/xfs/libxfs/xfs_btree.h b/fs/xfs/libxfs/xfs_btree.h
index 8a36012..830702b 100644 (file)
--- a/fs/xfs/libxfs/xfs_btree.h
+++ b/fs/xfs/libxfs/xfs_btree.h
@@ -117,8 +117,8 @@ struct xfs_btree_ops {
 
        /* update last record information */
        void    (*update_lastrec)(struct xfs_btree_cur *cur,
-                                 struct xfs_btree_block *block,
-                                 union xfs_btree_rec *rec,
+                                 const struct xfs_btree_block *block,
+                                 const union xfs_btree_rec *rec,
                                  int ptr, int reason);
 
        /* records in block/level */
@@ -423,7 +423,7 @@ void xfs_btree_log_recs(struct xfs_btree_cur *, struct xfs_buf *, int, int);
 /*
  * Helpers.
  */
-static inline int xfs_btree_get_numrecs(struct xfs_btree_block *block)
+static inline int xfs_btree_get_numrecs(const struct xfs_btree_block *block)
 {
        return be16_to_cpu(block->bb_numrecs);
 }
@@ -434,7 +434,7 @@ static inline void xfs_btree_set_numrecs(struct xfs_btree_block *block,
        block->bb_numrecs = cpu_to_be16(numrecs);
 }
 
-static inline int xfs_btree_get_level(struct xfs_btree_block *block)
+static inline int xfs_btree_get_level(const struct xfs_btree_block *block)
 {
        return be16_to_cpu(block->bb_level);
 }