| #ifndef __EXTENTIO__ |
| #define __EXTENTIO__ |
| |
| #include <linux/rbtree.h> |
| |
| /* bits for the extent state */ |
| #define EXTENT_DIRTY 1 |
| #define EXTENT_WRITEBACK (1 << 1) |
| #define EXTENT_UPTODATE (1 << 2) |
| #define EXTENT_LOCKED (1 << 3) |
| #define EXTENT_NEW (1 << 4) |
| #define EXTENT_DELALLOC (1 << 5) |
| #define EXTENT_DEFRAG (1 << 6) |
| #define EXTENT_DEFRAG_DONE (1 << 7) |
| #define EXTENT_BUFFER_FILLED (1 << 8) |
| #define EXTENT_BOUNDARY (1 << 9) |
| #define EXTENT_NODATASUM (1 << 10) |
| #define EXTENT_DO_ACCOUNTING (1 << 11) |
| #define EXTENT_FIRST_DELALLOC (1 << 12) |
| #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK) |
| #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC) |
| |
| /* |
| * flags for bio submission. The high bits indicate the compression |
| * type for this bio |
| */ |
| #define EXTENT_BIO_COMPRESSED 1 |
| #define EXTENT_BIO_FLAG_SHIFT 16 |
| |
| /* these are bit numbers for test/set bit */ |
| #define EXTENT_BUFFER_UPTODATE 0 |
| #define EXTENT_BUFFER_BLOCKING 1 |
| #define EXTENT_BUFFER_DIRTY 2 |
| #define EXTENT_BUFFER_CORRUPT 3 |
| |
| /* these are flags for extent_clear_unlock_delalloc */ |
| #define EXTENT_CLEAR_UNLOCK_PAGE 0x1 |
| #define EXTENT_CLEAR_UNLOCK 0x2 |
| #define EXTENT_CLEAR_DELALLOC 0x4 |
| #define EXTENT_CLEAR_DIRTY 0x8 |
| #define EXTENT_SET_WRITEBACK 0x10 |
| #define EXTENT_END_WRITEBACK 0x20 |
| #define EXTENT_SET_PRIVATE2 0x40 |
| #define EXTENT_CLEAR_ACCOUNTING 0x80 |
| |
| /* |
| * page->private values. Every page that is controlled by the extent |
| * map has page->private set to one. |
| */ |
| #define EXTENT_PAGE_PRIVATE 1 |
| #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3 |
| |
| struct extent_state; |
| |
| typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw, |
| struct bio *bio, int mirror_num, |
| unsigned long bio_flags, u64 bio_offset); |
| struct extent_io_ops { |
| int (*fill_delalloc)(struct inode *inode, struct page *locked_page, |
| u64 start, u64 end, int *page_started, |
| unsigned long *nr_written); |
| int (*writepage_start_hook)(struct page *page, u64 start, u64 end); |
| int (*writepage_io_hook)(struct page *page, u64 start, u64 end); |
| extent_submit_bio_hook_t *submit_bio_hook; |
| int (*merge_bio_hook)(struct page *page, unsigned long offset, |
| size_t size, struct bio *bio, |
| unsigned long bio_flags); |
| int (*readpage_io_hook)(struct page *page, u64 start, u64 end); |
| int (*readpage_io_failed_hook)(struct bio *bio, struct page *page, |
| u64 start, u64 end, |
| struct extent_state *state); |
| int (*writepage_io_failed_hook)(struct bio *bio, struct page *page, |
| u64 start, u64 end, |
| struct extent_state *state); |
| int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end, |
| struct extent_state *state); |
| int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end, |
| struct extent_state *state, int uptodate); |
| void (*set_bit_hook)(struct inode *inode, struct extent_state *state, |
| int *bits); |
| void (*clear_bit_hook)(struct inode *inode, struct extent_state *state, |
| int *bits); |
| void (*merge_extent_hook)(struct inode *inode, |
| struct extent_state *new, |
| struct extent_state *other); |
| void (*split_extent_hook)(struct inode *inode, |
| struct extent_state *orig, u64 split); |
| int (*write_cache_pages_lock_hook)(struct page *page); |
| }; |
| |
| struct extent_io_tree { |
| struct rb_root state; |
| struct radix_tree_root buffer; |
| struct address_space *mapping; |
| u64 dirty_bytes; |
| spinlock_t lock; |
| spinlock_t buffer_lock; |
| struct extent_io_ops *ops; |
| }; |
| |
| struct extent_state { |
| u64 start; |
| u64 end; /* inclusive */ |
| struct rb_node rb_node; |
| |
| /* ADD NEW ELEMENTS AFTER THIS */ |
| struct extent_io_tree *tree; |
| wait_queue_head_t wq; |
| atomic_t refs; |
| unsigned long state; |
| |
| /* for use by the FS */ |
| u64 private; |
| |
| struct list_head leak_list; |
| }; |
| |
| struct extent_buffer { |
| u64 start; |
| unsigned long len; |
| unsigned long map_start; |
| unsigned long map_len; |
| struct page *first_page; |
| unsigned long bflags; |
| struct list_head leak_list; |
| struct rcu_head rcu_head; |
| atomic_t refs; |
| |
| /* count of read lock holders on the extent buffer */ |
| atomic_t write_locks; |
| atomic_t read_locks; |
| atomic_t blocking_writers; |
| atomic_t blocking_readers; |
| atomic_t spinning_readers; |
| atomic_t spinning_writers; |
| |
| /* protects write locks */ |
| rwlock_t lock; |
| |
| /* readers use lock_wq while they wait for the write |
| * lock holders to unlock |
| */ |
| wait_queue_head_t write_lock_wq; |
| |
| /* writers use read_lock_wq while they wait for readers |
| * to unlock |
| */ |
| wait_queue_head_t read_lock_wq; |
| }; |
| |
| static inline void extent_set_compress_type(unsigned long *bio_flags, |
| int compress_type) |
| { |
| *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT; |
| } |
| |
| static inline int extent_compress_type(unsigned long bio_flags) |
| { |
| return bio_flags >> EXTENT_BIO_FLAG_SHIFT; |
| } |
| |
| struct extent_map_tree; |
| |
| typedef struct extent_map *(get_extent_t)(struct inode *inode, |
| struct page *page, |
| size_t pg_offset, |
| u64 start, u64 len, |
| int create); |
| |
| void extent_io_tree_init(struct extent_io_tree *tree, |
| struct address_space *mapping); |
| int try_release_extent_mapping(struct extent_map_tree *map, |
| struct extent_io_tree *tree, struct page *page, |
| gfp_t mask); |
| int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page); |
| int try_release_extent_state(struct extent_map_tree *map, |
| struct extent_io_tree *tree, struct page *page, |
| gfp_t mask); |
| int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask); |
| int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
| int bits, struct extent_state **cached, gfp_t mask); |
| int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask); |
| int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end, |
| struct extent_state **cached, gfp_t mask); |
| int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end, |
| gfp_t mask); |
| int extent_read_full_page(struct extent_io_tree *tree, struct page *page, |
| get_extent_t *get_extent); |
| int __init extent_io_init(void); |
| void extent_io_exit(void); |
| |
| u64 count_range_bits(struct extent_io_tree *tree, |
| u64 *start, u64 search_end, |
| u64 max_bytes, unsigned long bits, int contig); |
| |
| void free_extent_state(struct extent_state *state); |
| int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, |
| int bits, int filled, struct extent_state *cached_state); |
| int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
| int bits, gfp_t mask); |
| int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
| int bits, int wake, int delete, struct extent_state **cached, |
| gfp_t mask); |
| int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
| int bits, gfp_t mask); |
| int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
| int bits, int exclusive_bits, u64 *failed_start, |
| struct extent_state **cached_state, gfp_t mask); |
| int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, |
| struct extent_state **cached_state, gfp_t mask); |
| int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end, |
| gfp_t mask); |
| int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, |
| gfp_t mask); |
| int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, |
| gfp_t mask); |
| int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, |
| struct extent_state **cached_state, gfp_t mask); |
| int find_first_extent_bit(struct extent_io_tree *tree, u64 start, |
| u64 *start_ret, u64 *end_ret, int bits); |
| struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree, |
| u64 start, int bits); |
| int extent_invalidatepage(struct extent_io_tree *tree, |
| struct page *page, unsigned long offset); |
| int extent_write_full_page(struct extent_io_tree *tree, struct page *page, |
| get_extent_t *get_extent, |
| struct writeback_control *wbc); |
| int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, |
| u64 start, u64 end, get_extent_t *get_extent, |
| int mode); |
| int extent_writepages(struct extent_io_tree *tree, |
| struct address_space *mapping, |
| get_extent_t *get_extent, |
| struct writeback_control *wbc); |
| int extent_readpages(struct extent_io_tree *tree, |
| struct address_space *mapping, |
| struct list_head *pages, unsigned nr_pages, |
| get_extent_t get_extent); |
| int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
| __u64 start, __u64 len, get_extent_t *get_extent); |
| int set_state_private(struct extent_io_tree *tree, u64 start, u64 private); |
| int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private); |
| void set_page_extent_mapped(struct page *page); |
| |
| struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree, |
| u64 start, unsigned long len, |
| struct page *page0); |
| struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree, |
| u64 start, unsigned long len); |
| void free_extent_buffer(struct extent_buffer *eb); |
| int read_extent_buffer_pages(struct extent_io_tree *tree, |
| struct extent_buffer *eb, u64 start, int wait, |
| get_extent_t *get_extent, int mirror_num); |
| |
| 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, |
| unsigned long start, |
| unsigned long len); |
| void write_extent_buffer(struct extent_buffer *eb, const void *src, |
| unsigned long start, unsigned long len); |
| void copy_extent_buffer(struct extent_buffer *dst, 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 memset_extent_buffer(struct extent_buffer *eb, char c, |
| unsigned long start, unsigned long len); |
| int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits); |
| int clear_extent_buffer_dirty(struct extent_io_tree *tree, |
| struct extent_buffer *eb); |
| int set_extent_buffer_dirty(struct extent_io_tree *tree, |
| struct extent_buffer *eb); |
| int set_extent_buffer_uptodate(struct extent_io_tree *tree, |
| struct extent_buffer *eb); |
| int clear_extent_buffer_uptodate(struct extent_io_tree *tree, |
| struct extent_buffer *eb, |
| struct extent_state **cached_state); |
| int extent_buffer_uptodate(struct extent_io_tree *tree, |
| struct extent_buffer *eb, |
| struct extent_state *cached_state); |
| 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 extent_range_uptodate(struct extent_io_tree *tree, |
| u64 start, u64 end); |
| int extent_clear_unlock_delalloc(struct inode *inode, |
| struct extent_io_tree *tree, |
| u64 start, u64 end, struct page *locked_page, |
| unsigned long op); |
| struct bio * |
| btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, |
| gfp_t gfp_flags); |
| #endif |