f2fs: Mark some functions as taking a const page pointer

The compiler can make some optimisations if we tell it that a function
call doesn't change this memory.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 954baa08957ec67ef5334dd07b32bef252c12ce3..e0af6b44197a2189b226553bd3d8343508122d8b 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -2026,7 +2026,7 @@ static inline struct f2fs_checkpoint *F2FS_CKPT(struct f2fs_sb_info *sbi)
        return (struct f2fs_checkpoint *)(sbi->ckpt);
 }
 
-static inline struct f2fs_node *F2FS_NODE(struct page *page)
+static inline struct f2fs_node *F2FS_NODE(const struct page *page)
 {
        return (struct f2fs_node *)page_address(page);
 }

diff --git a/fs/f2fs/node.h b/fs/f2fs/node.h
index 6aea13024ac1659f83fe412849bbb64cb0ec2abd..281d53c95c9a4923275ceec4eafacc7fe5a870c1 100644 (file)
--- a/fs/f2fs/node.h
+++ b/fs/f2fs/node.h
@@ -248,7 +248,7 @@ static inline nid_t nid_of_node(struct page *node_page)
        return le32_to_cpu(rn->footer.nid);
 }
 
-static inline unsigned int ofs_of_node(struct page *node_page)
+static inline unsigned int ofs_of_node(const struct page *node_page)
 {
        struct f2fs_node *rn = F2FS_NODE(node_page);
        unsigned flag = le32_to_cpu(rn->footer.flag);
@@ -342,7 +342,7 @@ static inline bool is_recoverable_dnode(struct page *page)
  *                 `- indirect node ((6 + 2N) + (N - 1)(N + 1))
  *                       `- direct node
  */
-static inline bool IS_DNODE(struct page *node_page)
+static inline bool IS_DNODE(const struct page *node_page)
 {
        unsigned int ofs = ofs_of_node(node_page);
 
@@ -389,7 +389,7 @@ static inline nid_t get_nid(struct page *p, int off, bool i)
  *  - Mark cold data pages in page cache
  */
 
-static inline int is_node(struct page *page, int type)
+static inline int is_node(const struct page *page, int type)
 {
        struct f2fs_node *rn = F2FS_NODE(page);
        return le32_to_cpu(rn->footer.flag) & BIT(type);