Commit 2b48966a authored by David Sterba's avatar David Sterba
Browse files

btrfs: constify extent_buffer in the API functions 



There are many helpers around extent buffers, found in extent_io.h and
ctree.h. Most of them can be converted to take constified eb as there
are no changes to the extent buffer structure itself but rather the
pages.

Reviewed-by: default avatarJohannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent db3756c8

fs/btrfs/ctree.h

+14 −14
Original line number Diff line number Diff line
@@ -1384,7 +1384,7 @@ void btrfs_set_token_##bits(struct btrfs_map_token *token, \ 
			    u##bits val);				\

u##bits btrfs_get_##bits(const struct extent_buffer *eb,		\

			 const void *ptr, unsigned long off);		\

void btrfs_set_##bits(struct extent_buffer *eb, void *ptr,		\

void btrfs_set_##bits(const struct extent_buffer *eb, void *ptr,	\

		      unsigned long off, u##bits val);



DECLARE_BTRFS_SETGET_BITS(8)
@@ -1399,7 +1399,7 @@ static inline u##bits btrfs_##name(const struct extent_buffer *eb, \ 
	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\

	return btrfs_get_##bits(eb, s, offsetof(type, member));		\

}									\

static inline void btrfs_set_##name(struct extent_buffer *eb, type *s,	\

static inline void btrfs_set_##name(const struct extent_buffer *eb, type *s, \

				    u##bits val)			\

{									\

	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
@@ -1425,7 +1425,7 @@ static inline u##bits btrfs_##name(const struct extent_buffer *eb) \ 
	u##bits res = le##bits##_to_cpu(p->member);			\

	return res;							\

}									\

static inline void btrfs_set_##name(struct extent_buffer *eb,		\

static inline void btrfs_set_##name(const struct extent_buffer *eb,	\

				    u##bits val)			\

{									\

	type *p = page_address(eb->pages[0]);				\
@@ -1443,7 +1443,7 @@ static inline void btrfs_set_##name(type *s, u##bits val) \ 
}





static inline u64 btrfs_device_total_bytes(struct extent_buffer *eb,

static inline u64 btrfs_device_total_bytes(const struct extent_buffer *eb,

					   struct btrfs_dev_item *s)

{

	BUILD_BUG_ON(sizeof(u64) !=
@@ -1451,7 +1451,7 @@ static inline u64 btrfs_device_total_bytes(struct extent_buffer *eb, 
	return btrfs_get_64(eb, s, offsetof(struct btrfs_dev_item,

					    total_bytes));

}

static inline void btrfs_set_device_total_bytes(struct extent_buffer *eb,

static inline void btrfs_set_device_total_bytes(const struct extent_buffer *eb,

						struct btrfs_dev_item *s,

						u64 val)

{
@@ -1555,13 +1555,13 @@ static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr) 
	return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));

}



static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,

static inline u64 btrfs_stripe_offset_nr(const struct extent_buffer *eb,

					 struct btrfs_chunk *c, int nr)

{

	return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));

}



static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,

static inline u64 btrfs_stripe_devid_nr(const struct extent_buffer *eb,

					 struct btrfs_chunk *c, int nr)

{

	return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
@@ -1648,14 +1648,14 @@ BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64); 


BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);



static inline void btrfs_tree_block_key(struct extent_buffer *eb,

static inline void btrfs_tree_block_key(const struct extent_buffer *eb,

					struct btrfs_tree_block_info *item,

					struct btrfs_disk_key *key)

{

	read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);

}



static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,

static inline void btrfs_set_tree_block_key(const struct extent_buffer *eb,

					    struct btrfs_tree_block_info *item,

					    struct btrfs_disk_key *key)

{
@@ -1701,7 +1701,7 @@ BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr, 
BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,

			 generation, 64);



static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)

static inline u64 btrfs_node_blockptr(const struct extent_buffer *eb, int nr)

{

	unsigned long ptr;

	ptr = offsetof(struct btrfs_node, ptrs) +
@@ -1709,7 +1709,7 @@ static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr) 
	return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);

}



static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,

static inline void btrfs_set_node_blockptr(const struct extent_buffer *eb,

					   int nr, u64 val)

{

	unsigned long ptr;
@@ -1718,7 +1718,7 @@ static inline void btrfs_set_node_blockptr(struct extent_buffer *eb, 
	btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);

}



static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)

static inline u64 btrfs_node_ptr_generation(const struct extent_buffer *eb, int nr)

{

	unsigned long ptr;

	ptr = offsetof(struct btrfs_node, ptrs) +
@@ -1726,7 +1726,7 @@ static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr) 
	return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);

}



static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,

static inline void btrfs_set_node_ptr_generation(const struct extent_buffer *eb,

						 int nr, u64 val)

{

	unsigned long ptr;
@@ -1744,7 +1744,7 @@ static inline unsigned long btrfs_node_key_ptr_offset(int nr) 
void btrfs_node_key(const struct extent_buffer *eb,

		    struct btrfs_disk_key *disk_key, int nr);



static inline void btrfs_set_node_key(struct extent_buffer *eb,

static inline void btrfs_set_node_key(const struct extent_buffer *eb,

				      struct btrfs_disk_key *disk_key, int nr)

{

	unsigned long ptr;

fs/btrfs/extent_io.c

+24 −20
Original line number Diff line number Diff line
@@ -2333,7 +2333,7 @@ int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start, 
	return 0;

}



int btrfs_repair_eb_io_failure(struct extent_buffer *eb, int mirror_num)

int btrfs_repair_eb_io_failure(const struct extent_buffer *eb, int mirror_num)

{

	struct btrfs_fs_info *fs_info = eb->fs_info;

	u64 start = eb->start;
@@ -4910,7 +4910,7 @@ static void __free_extent_buffer(struct extent_buffer *eb) 
	kmem_cache_free(extent_buffer_cache, eb);

}



int extent_buffer_under_io(struct extent_buffer *eb)

int extent_buffer_under_io(const struct extent_buffer *eb)

{

	return (atomic_read(&eb->io_pages) ||

		test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags) ||
@@ -5018,7 +5018,7 @@ __alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start, 
	return eb;

}



struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src)

struct extent_buffer *btrfs_clone_extent_buffer(const struct extent_buffer *src)

{

	int i;

	struct page *p;
@@ -5424,7 +5424,7 @@ void free_extent_buffer_stale(struct extent_buffer *eb) 
	release_extent_buffer(eb);

}



void clear_extent_buffer_dirty(struct extent_buffer *eb)

void clear_extent_buffer_dirty(const struct extent_buffer *eb)

{

	int i;

	int num_pages;
@@ -5720,7 +5720,7 @@ int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv, 
	return ret;

}



void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb,

void write_extent_buffer_chunk_tree_uuid(const struct extent_buffer *eb,

		const void *srcv)

{

	char *kaddr;
@@ -5731,7 +5731,7 @@ void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb, 
			BTRFS_FSID_SIZE);

}



void write_extent_buffer_fsid(struct extent_buffer *eb, const void *srcv)

void write_extent_buffer_fsid(const struct extent_buffer *eb, const void *srcv)

{

	char *kaddr;
@@ -5741,7 +5741,7 @@ void write_extent_buffer_fsid(struct extent_buffer *eb, const void *srcv) 
			BTRFS_FSID_SIZE);

}



void write_extent_buffer(struct extent_buffer *eb, const void *srcv,

void write_extent_buffer(const struct extent_buffer *eb, const void *srcv,

			 unsigned long start, unsigned long len)

{

	size_t cur;
@@ -5772,7 +5772,7 @@ void write_extent_buffer(struct extent_buffer *eb, const void *srcv, 
	}

}



void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start,

void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start,

		unsigned long len)

{

	size_t cur;
@@ -5801,8 +5801,8 @@ void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start, 
	}

}



void copy_extent_buffer_full(struct extent_buffer *dst,

			     struct extent_buffer *src)

void copy_extent_buffer_full(const struct extent_buffer *dst,

			     const struct extent_buffer *src)

{

	int i;

	int num_pages;
@@ -5815,7 +5815,8 @@ void copy_extent_buffer_full(struct extent_buffer *dst, 
				page_address(src->pages[i]));

}



void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,

void copy_extent_buffer(const struct extent_buffer *dst,

			const struct extent_buffer *src,

			unsigned long dst_offset, unsigned long src_offset,

			unsigned long len)

{
@@ -5860,7 +5861,7 @@ void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, 
 * This helper hides the ugliness of finding the byte in an extent buffer which

 * contains a given bit.

 */

static inline void eb_bitmap_offset(struct extent_buffer *eb,

static inline void eb_bitmap_offset(const struct extent_buffer *eb,

				    unsigned long start, unsigned long nr,

				    unsigned long *page_index,

				    size_t *page_offset)
@@ -5886,7 +5887,7 @@ static inline void eb_bitmap_offset(struct extent_buffer *eb, 
 * @start: offset of the bitmap item in the extent buffer

 * @nr: bit number to test

 */

int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,

int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start,

			   unsigned long nr)

{

	u8 *kaddr;
@@ -5908,7 +5909,7 @@ int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start, 
 * @pos: bit number of the first bit

 * @len: number of bits to set

 */

void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,

void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start,

			      unsigned long pos, unsigned long len)

{

	u8 *kaddr;
@@ -5950,8 +5951,9 @@ void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start, 
 * @pos: bit number of the first bit

 * @len: number of bits to clear

 */

void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,

				unsigned long pos, unsigned long len)

void extent_buffer_bitmap_clear(const struct extent_buffer *eb,

				unsigned long start, unsigned long pos,

				unsigned long len)

{

	u8 *kaddr;

	struct page *page;
@@ -6012,8 +6014,9 @@ static void copy_pages(struct page *dst_page, struct page *src_page, 
		memcpy(dst_kaddr + dst_off, src_kaddr + src_off, len);

}



void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,

			   unsigned long src_offset, unsigned long len)

void memcpy_extent_buffer(const struct extent_buffer *dst,

			  unsigned long dst_offset, unsigned long src_offset,

			  unsigned long len)

{

	struct btrfs_fs_info *fs_info = dst->fs_info;

	size_t cur;
@@ -6057,8 +6060,9 @@ void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 
	}

}



void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,

			   unsigned long src_offset, unsigned long len)

void memmove_extent_buffer(const struct extent_buffer *dst,

			   unsigned long dst_offset, unsigned long src_offset,

			   unsigned long len)

{

	struct btrfs_fs_info *fs_info = dst->fs_info;

	size_t cur;

fs/btrfs/extent_io.h

+24 −20
Original line number Diff line number Diff line
@@ -213,7 +213,7 @@ struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, 
						  u64 start, unsigned long len);

struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,

						u64 start);

struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);

struct extent_buffer *btrfs_clone_extent_buffer(const struct extent_buffer *src);

struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,

					 u64 start);

void free_extent_buffer(struct extent_buffer *eb);
@@ -231,7 +231,7 @@ static inline int num_extent_pages(const struct extent_buffer *eb) 
	       (eb->start >> PAGE_SHIFT);

}



static inline int extent_buffer_uptodate(struct extent_buffer *eb)

static inline int extent_buffer_uptodate(const struct extent_buffer *eb)

{

	return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);

}
@@ -244,33 +244,37 @@ void read_extent_buffer(const struct extent_buffer *eb, void *dst, 
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,

void write_extent_buffer_fsid(const struct extent_buffer *eb, const void *src);

void write_extent_buffer_chunk_tree_uuid(const struct extent_buffer *eb,

		const void *src);

void write_extent_buffer(struct extent_buffer *eb, const void *src,

void write_extent_buffer(const struct extent_buffer *eb, const void *src,

			 unsigned long start, unsigned long len);

void copy_extent_buffer_full(struct extent_buffer *dst,

			     struct extent_buffer *src);

void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,

void copy_extent_buffer_full(const struct extent_buffer *dst,

			     const struct extent_buffer *src);

void copy_extent_buffer(const struct extent_buffer *dst,

			const struct extent_buffer *src,

			unsigned long dst_offset, unsigned long src_offset,

			unsigned long len);

void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,

			   unsigned long src_offset, unsigned long len);

void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,

			   unsigned long src_offset, unsigned long len);

void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start,

void memcpy_extent_buffer(const struct extent_buffer *dst,

			  unsigned long dst_offset, unsigned long src_offset,

			  unsigned long len);

void memmove_extent_buffer(const struct extent_buffer *dst,

			   unsigned long dst_offset, unsigned long src_offset,

			   unsigned long len);

int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,

void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start,

			   unsigned long len);

int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start,

			   unsigned long pos);

void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,

			      unsigned long pos, unsigned long len);

void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,

void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start,

			      unsigned long pos, unsigned long len);

void clear_extent_buffer_dirty(struct extent_buffer *eb);

void extent_buffer_bitmap_clear(const struct extent_buffer *eb,

				unsigned long start, unsigned long pos,

				unsigned long len);

void clear_extent_buffer_dirty(const struct extent_buffer *eb);

bool set_extent_buffer_dirty(struct extent_buffer *eb);

void set_extent_buffer_uptodate(struct extent_buffer *eb);

void clear_extent_buffer_uptodate(struct extent_buffer *eb);

int extent_buffer_under_io(struct extent_buffer *eb);

int extent_buffer_under_io(const struct extent_buffer *eb);

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,
@@ -289,7 +293,7 @@ int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start, 
		      u64 length, u64 logical, struct page *page,

		      unsigned int pg_offset, int mirror_num);

void end_extent_writepage(struct page *page, int err, u64 start, u64 end);

int btrfs_repair_eb_io_failure(struct extent_buffer *eb, int mirror_num);

int btrfs_repair_eb_io_failure(const struct extent_buffer *eb, int mirror_num);



/*

 * When IO fails, either with EIO or csum verification fails, we

fs/btrfs/struct-funcs.c

+1 −1
Original line number Diff line number Diff line
@@ -131,7 +131,7 @@ void btrfs_set_token_##bits(struct btrfs_map_token *token, \ 
	leres = cpu_to_le##bits(val);					\

	write_extent_buffer(token->eb, &leres, member_offset, size);	\

}									\

void btrfs_set_##bits(struct extent_buffer *eb, void *ptr,		\

void btrfs_set_##bits(const struct extent_buffer *eb, void *ptr,	\

		      unsigned long off, u##bits val)			\

{									\

	const unsigned long member_offset = (unsigned long)ptr + off;	\

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