btrfs: struct-funcs, constify readers
We have reader helpers for most of the on-disk structures that use an extent_buffer and pointer as offset into the buffer that are read-only. We should mark them as const and, in turn, allow consumers of these interfaces to mark the buffers const as well. No impact on code, but serves as documentation that a buffer is intended not to be modified. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Jeff Mahoney
David Sterba
parent
23d1f73788
commit
1cbb1f454e
128
fs/btrfs/ctree.h
128
fs/btrfs/ctree.h
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@ -1434,7 +1434,7 @@ do { \
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#define BTRFS_INODE_ROOT_ITEM_INIT (1 << 31)
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struct btrfs_map_token {
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struct extent_buffer *eb;
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const struct extent_buffer *eb;
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char *kaddr;
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unsigned long offset;
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};
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@ -1468,18 +1468,19 @@ static inline void btrfs_init_map_token (struct btrfs_map_token *token)
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sizeof(((type *)0)->member)))
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#define DECLARE_BTRFS_SETGET_BITS(bits) \
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u##bits btrfs_get_token_##bits(struct extent_buffer *eb, void *ptr, \
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unsigned long off, \
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struct btrfs_map_token *token); \
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void btrfs_set_token_##bits(struct extent_buffer *eb, void *ptr, \
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u##bits btrfs_get_token_##bits(const struct extent_buffer *eb, \
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const void *ptr, unsigned long off, \
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struct btrfs_map_token *token); \
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void btrfs_set_token_##bits(struct extent_buffer *eb, const void *ptr, \
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unsigned long off, u##bits val, \
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struct btrfs_map_token *token); \
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static inline u##bits btrfs_get_##bits(struct extent_buffer *eb, void *ptr, \
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static inline u##bits btrfs_get_##bits(const struct extent_buffer *eb, \
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const void *ptr, \
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unsigned long off) \
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{ \
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return btrfs_get_token_##bits(eb, ptr, off, NULL); \
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} \
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static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr, \
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static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr,\
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unsigned long off, u##bits val) \
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{ \
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btrfs_set_token_##bits(eb, ptr, off, val, NULL); \
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@ -1491,7 +1492,8 @@ DECLARE_BTRFS_SETGET_BITS(32)
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DECLARE_BTRFS_SETGET_BITS(64)
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#define BTRFS_SETGET_FUNCS(name, type, member, bits) \
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static inline u##bits btrfs_##name(struct extent_buffer *eb, type *s) \
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static inline u##bits btrfs_##name(const struct extent_buffer *eb, \
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const type *s) \
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{ \
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BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
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return btrfs_get_##bits(eb, s, offsetof(type, member)); \
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@ -1502,7 +1504,8 @@ static inline void btrfs_set_##name(struct extent_buffer *eb, type *s, \
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BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
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btrfs_set_##bits(eb, s, offsetof(type, member), val); \
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} \
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static inline u##bits btrfs_token_##name(struct extent_buffer *eb, type *s, \
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static inline u##bits btrfs_token_##name(const struct extent_buffer *eb,\
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const type *s, \
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struct btrfs_map_token *token) \
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{ \
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BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
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@ -1517,9 +1520,9 @@ static inline void btrfs_set_token_##name(struct extent_buffer *eb, \
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}
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#define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
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static inline u##bits btrfs_##name(struct extent_buffer *eb) \
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static inline u##bits btrfs_##name(const struct extent_buffer *eb) \
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{ \
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type *p = page_address(eb->pages[0]); \
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const type *p = page_address(eb->pages[0]); \
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u##bits res = le##bits##_to_cpu(p->member); \
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return res; \
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} \
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@ -1531,7 +1534,7 @@ static inline void btrfs_set_##name(struct extent_buffer *eb, \
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}
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#define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
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static inline u##bits btrfs_##name(type *s) \
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static inline u##bits btrfs_##name(const type *s) \
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{ \
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return le##bits##_to_cpu(s->member); \
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} \
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@ -1856,7 +1859,7 @@ static inline unsigned long btrfs_node_key_ptr_offset(int nr)
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sizeof(struct btrfs_key_ptr) * nr;
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}
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void btrfs_node_key(struct extent_buffer *eb,
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void btrfs_node_key(const struct extent_buffer *eb,
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struct btrfs_disk_key *disk_key, int nr);
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static inline void btrfs_set_node_key(struct extent_buffer *eb,
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@ -1885,28 +1888,28 @@ static inline struct btrfs_item *btrfs_item_nr(int nr)
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return (struct btrfs_item *)btrfs_item_nr_offset(nr);
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}
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static inline u32 btrfs_item_end(struct extent_buffer *eb,
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static inline u32 btrfs_item_end(const struct extent_buffer *eb,
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struct btrfs_item *item)
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{
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return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
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}
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static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
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static inline u32 btrfs_item_end_nr(const struct extent_buffer *eb, int nr)
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{
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return btrfs_item_end(eb, btrfs_item_nr(nr));
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}
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static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
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static inline u32 btrfs_item_offset_nr(const struct extent_buffer *eb, int nr)
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{
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return btrfs_item_offset(eb, btrfs_item_nr(nr));
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}
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static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
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static inline u32 btrfs_item_size_nr(const struct extent_buffer *eb, int nr)
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{
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return btrfs_item_size(eb, btrfs_item_nr(nr));
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}
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static inline void btrfs_item_key(struct extent_buffer *eb,
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static inline void btrfs_item_key(const struct extent_buffer *eb,
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struct btrfs_disk_key *disk_key, int nr)
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{
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struct btrfs_item *item = btrfs_item_nr(nr);
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@ -1942,8 +1945,8 @@ BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
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BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
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transid, 64);
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static inline void btrfs_dir_item_key(struct extent_buffer *eb,
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struct btrfs_dir_item *item,
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static inline void btrfs_dir_item_key(const struct extent_buffer *eb,
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const struct btrfs_dir_item *item,
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struct btrfs_disk_key *key)
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{
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read_eb_member(eb, item, struct btrfs_dir_item, location, key);
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@ -1951,7 +1954,7 @@ static inline void btrfs_dir_item_key(struct extent_buffer *eb,
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static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
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struct btrfs_dir_item *item,
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struct btrfs_disk_key *key)
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const struct btrfs_disk_key *key)
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{
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write_eb_member(eb, item, struct btrfs_dir_item, location, key);
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}
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@ -1963,8 +1966,8 @@ BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
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BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
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generation, 64);
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static inline void btrfs_free_space_key(struct extent_buffer *eb,
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struct btrfs_free_space_header *h,
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static inline void btrfs_free_space_key(const struct extent_buffer *eb,
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const struct btrfs_free_space_header *h,
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struct btrfs_disk_key *key)
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{
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read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
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@ -1972,7 +1975,7 @@ static inline void btrfs_free_space_key(struct extent_buffer *eb,
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static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
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struct btrfs_free_space_header *h,
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struct btrfs_disk_key *key)
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const struct btrfs_disk_key *key)
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{
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write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
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}
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@ -1999,25 +2002,25 @@ static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
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disk->objectid = cpu_to_le64(cpu->objectid);
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}
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static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
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struct btrfs_key *key, int nr)
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static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
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struct btrfs_key *key, int nr)
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{
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struct btrfs_disk_key disk_key;
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btrfs_node_key(eb, &disk_key, nr);
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btrfs_disk_key_to_cpu(key, &disk_key);
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}
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static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
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struct btrfs_key *key, int nr)
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static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
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struct btrfs_key *key, int nr)
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{
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struct btrfs_disk_key disk_key;
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btrfs_item_key(eb, &disk_key, nr);
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btrfs_disk_key_to_cpu(key, &disk_key);
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}
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static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
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struct btrfs_dir_item *item,
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struct btrfs_key *key)
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static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
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const struct btrfs_dir_item *item,
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struct btrfs_key *key)
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{
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struct btrfs_disk_key disk_key;
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btrfs_dir_item_key(eb, item, &disk_key);
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@ -2049,7 +2052,7 @@ BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
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nritems, 32);
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BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
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static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
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static inline int btrfs_header_flag(const struct extent_buffer *eb, u64 flag)
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{
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return (btrfs_header_flags(eb) & flag) == flag;
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}
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@ -2068,7 +2071,7 @@ static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
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return (flags & flag) == flag;
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}
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static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
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static inline int btrfs_header_backref_rev(const struct extent_buffer *eb)
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{
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u64 flags = btrfs_header_flags(eb);
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return flags >> BTRFS_BACKREF_REV_SHIFT;
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@ -2088,12 +2091,12 @@ static inline unsigned long btrfs_header_fsid(void)
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return offsetof(struct btrfs_header, fsid);
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}
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static inline unsigned long btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
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static inline unsigned long btrfs_header_chunk_tree_uuid(const struct extent_buffer *eb)
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{
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return offsetof(struct btrfs_header, chunk_tree_uuid);
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}
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static inline int btrfs_is_leaf(struct extent_buffer *eb)
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static inline int btrfs_is_leaf(const struct extent_buffer *eb)
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{
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return btrfs_header_level(eb) == 0;
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}
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@ -2127,12 +2130,12 @@ BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
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BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
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rtransid, 64);
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static inline bool btrfs_root_readonly(struct btrfs_root *root)
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static inline bool btrfs_root_readonly(const struct btrfs_root *root)
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{
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return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
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}
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static inline bool btrfs_root_dead(struct btrfs_root *root)
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static inline bool btrfs_root_dead(const struct btrfs_root *root)
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{
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return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
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}
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@ -2189,51 +2192,51 @@ BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
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/* struct btrfs_balance_item */
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BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
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static inline void btrfs_balance_data(struct extent_buffer *eb,
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struct btrfs_balance_item *bi,
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static inline void btrfs_balance_data(const struct extent_buffer *eb,
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const struct btrfs_balance_item *bi,
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struct btrfs_disk_balance_args *ba)
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{
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read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
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}
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static inline void btrfs_set_balance_data(struct extent_buffer *eb,
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struct btrfs_balance_item *bi,
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struct btrfs_disk_balance_args *ba)
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struct btrfs_balance_item *bi,
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const struct btrfs_disk_balance_args *ba)
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{
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write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
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}
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static inline void btrfs_balance_meta(struct extent_buffer *eb,
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struct btrfs_balance_item *bi,
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static inline void btrfs_balance_meta(const struct extent_buffer *eb,
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const struct btrfs_balance_item *bi,
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struct btrfs_disk_balance_args *ba)
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{
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read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
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}
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static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
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struct btrfs_balance_item *bi,
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struct btrfs_disk_balance_args *ba)
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struct btrfs_balance_item *bi,
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const struct btrfs_disk_balance_args *ba)
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{
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write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
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}
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static inline void btrfs_balance_sys(struct extent_buffer *eb,
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struct btrfs_balance_item *bi,
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static inline void btrfs_balance_sys(const struct extent_buffer *eb,
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const struct btrfs_balance_item *bi,
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struct btrfs_disk_balance_args *ba)
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{
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read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
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}
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static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
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struct btrfs_balance_item *bi,
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struct btrfs_disk_balance_args *ba)
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struct btrfs_balance_item *bi,
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const struct btrfs_disk_balance_args *ba)
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{
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write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
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}
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static inline void
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btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
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struct btrfs_disk_balance_args *disk)
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const struct btrfs_disk_balance_args *disk)
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{
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memset(cpu, 0, sizeof(*cpu));
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@ -2253,7 +2256,7 @@ btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
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static inline void
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btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
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struct btrfs_balance_args *cpu)
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const struct btrfs_balance_args *cpu)
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{
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memset(disk, 0, sizeof(*disk));
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@ -2321,7 +2324,7 @@ BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
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BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
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uuid_tree_generation, 64);
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static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
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static inline int btrfs_super_csum_size(const struct btrfs_super_block *s)
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{
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u16 t = btrfs_super_csum_type(s);
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/*
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@ -2336,8 +2339,8 @@ static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
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* this returns the address of the start of the last item,
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* which is the stop of the leaf data stack
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*/
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static inline unsigned int leaf_data_end(struct btrfs_fs_info *fs_info,
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struct extent_buffer *leaf)
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static inline unsigned int leaf_data_end(const struct btrfs_fs_info *fs_info,
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const struct extent_buffer *leaf)
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{
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u32 nr = btrfs_header_nritems(leaf);
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@ -2362,7 +2365,7 @@ BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
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struct btrfs_file_extent_item, compression, 8);
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static inline unsigned long
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btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e)
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btrfs_file_extent_inline_start(const struct btrfs_file_extent_item *e)
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{
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return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
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}
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@ -2396,8 +2399,9 @@ BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
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* size of any extent headers. If a file is compressed on disk, this is
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* the compressed size
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*/
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static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
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struct btrfs_item *e)
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static inline u32 btrfs_file_extent_inline_item_len(
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const struct extent_buffer *eb,
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struct btrfs_item *e)
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{
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return btrfs_item_size(eb, e) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
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}
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@ -2405,9 +2409,9 @@ static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
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/* this returns the number of file bytes represented by the inline item.
|
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* If an item is compressed, this is the uncompressed size
|
||||
*/
|
||||
static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
|
||||
int slot,
|
||||
struct btrfs_file_extent_item *fi)
|
||||
static inline u32 btrfs_file_extent_inline_len(const struct extent_buffer *eb,
|
||||
int slot,
|
||||
const struct btrfs_file_extent_item *fi)
|
||||
{
|
||||
struct btrfs_map_token token;
|
||||
|
||||
|
|
@ -2429,8 +2433,8 @@ static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
|
|||
|
||||
|
||||
/* btrfs_dev_stats_item */
|
||||
static inline u64 btrfs_dev_stats_value(struct extent_buffer *eb,
|
||||
struct btrfs_dev_stats_item *ptr,
|
||||
static inline u64 btrfs_dev_stats_value(const struct extent_buffer *eb,
|
||||
const struct btrfs_dev_stats_item *ptr,
|
||||
int index)
|
||||
{
|
||||
u64 val;
|
||||
|
|
|
|||
|
|
@ -5405,9 +5405,8 @@ unlock_exit:
|
|||
return ret;
|
||||
}
|
||||
|
||||
void read_extent_buffer(struct extent_buffer *eb, void *dstv,
|
||||
unsigned long start,
|
||||
unsigned long len)
|
||||
void read_extent_buffer(const struct extent_buffer *eb, void *dstv,
|
||||
unsigned long start, unsigned long len)
|
||||
{
|
||||
size_t cur;
|
||||
size_t offset;
|
||||
|
|
@ -5436,9 +5435,9 @@ void read_extent_buffer(struct extent_buffer *eb, void *dstv,
|
|||
}
|
||||
}
|
||||
|
||||
int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dstv,
|
||||
unsigned long start,
|
||||
unsigned long len)
|
||||
int read_extent_buffer_to_user(const struct extent_buffer *eb,
|
||||
void __user *dstv,
|
||||
unsigned long start, unsigned long len)
|
||||
{
|
||||
size_t cur;
|
||||
size_t offset;
|
||||
|
|
@ -5478,10 +5477,10 @@ int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dstv,
|
|||
* return 1 if the item spans two pages.
|
||||
* return -EINVAL otherwise.
|
||||
*/
|
||||
int map_private_extent_buffer(struct extent_buffer *eb, unsigned long start,
|
||||
unsigned long min_len, char **map,
|
||||
unsigned long *map_start,
|
||||
unsigned long *map_len)
|
||||
int map_private_extent_buffer(const struct extent_buffer *eb,
|
||||
unsigned long start, unsigned long min_len,
|
||||
char **map, unsigned long *map_start,
|
||||
unsigned long *map_len)
|
||||
{
|
||||
size_t offset = start & (PAGE_SIZE - 1);
|
||||
char *kaddr;
|
||||
|
|
@ -5515,9 +5514,8 @@ int map_private_extent_buffer(struct extent_buffer *eb, unsigned long start,
|
|||
return 0;
|
||||
}
|
||||
|
||||
int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
|
||||
unsigned long start,
|
||||
unsigned long len)
|
||||
int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
|
||||
unsigned long start, unsigned long len)
|
||||
{
|
||||
size_t cur;
|
||||
size_t offset;
|
||||
|
|
|
|||
|
|
@ -449,14 +449,13 @@ static inline void extent_buffer_get(struct extent_buffer *eb)
|
|||
atomic_inc(&eb->refs);
|
||||
}
|
||||
|
||||
int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
|
||||
unsigned long start,
|
||||
unsigned long len);
|
||||
void read_extent_buffer(struct extent_buffer *eb, void *dst,
|
||||
int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
|
||||
unsigned long start, unsigned long len);
|
||||
void read_extent_buffer(const struct extent_buffer *eb, void *dst,
|
||||
unsigned long start,
|
||||
unsigned long len);
|
||||
int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst,
|
||||
unsigned long start,
|
||||
int read_extent_buffer_to_user(const struct extent_buffer *eb,
|
||||
void __user *dst, unsigned long start,
|
||||
unsigned long len);
|
||||
void write_extent_buffer_fsid(struct extent_buffer *eb, const void *src);
|
||||
void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb,
|
||||
|
|
@ -486,10 +485,10 @@ void set_extent_buffer_uptodate(struct extent_buffer *eb);
|
|||
void clear_extent_buffer_uptodate(struct extent_buffer *eb);
|
||||
int extent_buffer_uptodate(struct extent_buffer *eb);
|
||||
int extent_buffer_under_io(struct extent_buffer *eb);
|
||||
int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
|
||||
unsigned long min_len, char **map,
|
||||
unsigned long *map_start,
|
||||
unsigned long *map_len);
|
||||
int map_private_extent_buffer(const struct extent_buffer *eb,
|
||||
unsigned long offset, unsigned long min_len,
|
||||
char **map, unsigned long *map_start,
|
||||
unsigned long *map_len);
|
||||
void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
|
||||
void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
|
||||
void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
|
||||
|
|
|
|||
|
|
@ -50,8 +50,8 @@ static inline void put_unaligned_le8(u8 val, void *p)
|
|||
*/
|
||||
|
||||
#define DEFINE_BTRFS_SETGET_BITS(bits) \
|
||||
u##bits btrfs_get_token_##bits(struct extent_buffer *eb, void *ptr, \
|
||||
unsigned long off, \
|
||||
u##bits btrfs_get_token_##bits(const struct extent_buffer *eb, \
|
||||
const void *ptr, unsigned long off, \
|
||||
struct btrfs_map_token *token) \
|
||||
{ \
|
||||
unsigned long part_offset = (unsigned long)ptr; \
|
||||
|
|
@ -90,7 +90,8 @@ u##bits btrfs_get_token_##bits(struct extent_buffer *eb, void *ptr, \
|
|||
return res; \
|
||||
} \
|
||||
void btrfs_set_token_##bits(struct extent_buffer *eb, \
|
||||
void *ptr, unsigned long off, u##bits val, \
|
||||
const void *ptr, unsigned long off, \
|
||||
u##bits val, \
|
||||
struct btrfs_map_token *token) \
|
||||
{ \
|
||||
unsigned long part_offset = (unsigned long)ptr; \
|
||||
|
|
@ -133,7 +134,7 @@ DEFINE_BTRFS_SETGET_BITS(16)
|
|||
DEFINE_BTRFS_SETGET_BITS(32)
|
||||
DEFINE_BTRFS_SETGET_BITS(64)
|
||||
|
||||
void btrfs_node_key(struct extent_buffer *eb,
|
||||
void btrfs_node_key(const struct extent_buffer *eb,
|
||||
struct btrfs_disk_key *disk_key, int nr)
|
||||
{
|
||||
unsigned long ptr = btrfs_node_key_ptr_offset(nr);
|
||||
|
|
|
|||
Loading…
Reference in New Issue