diff options
| author | Jeff Mahoney <jeffm@suse.com> | 2017-06-28 21:56:53 -0600 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2017-08-16 14:19:53 +0200 |
| commit | 1cbb1f454e5321e47fc1e6b233066c7ccc979d15 (patch) | |
| tree | 574441acf725ed6fc7dc370c0c1d298989051981 /fs/btrfs/extent_io.h | |
| parent | 23d1f73788785a770fe6eb348fee4b26281d2064 (diff) | |
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>
Diffstat (limited to 'fs/btrfs/extent_io.h')
| -rw-r--r-- | fs/btrfs/extent_io.h | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index 4f030912f3ef..faffa28ba707 100644 --- a/fs/btrfs/extent_io.h +++ b/fs/btrfs/extent_io.h @@ -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, |