#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_NEED_WAIT (1 << 13) #define EXTENT_DAMAGED (1 << 14) #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 #define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */ #define EXTENT_BUFFER_TREE_REF 5 #define EXTENT_BUFFER_STALE 6 #define EXTENT_BUFFER_WRITEBACK 7 #define EXTENT_BUFFER_IOERR 8 #define EXTENT_BUFFER_DUMMY 9 /* 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; struct btrfs_root; 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 page *page, int failed_mirror); int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end, struct extent_state *state, int mirror); 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, void *data, void (*flush_fn)(void *)); }; struct extent_io_tree { struct rb_root state; struct radix_tree_root buffer; struct address_space *mapping; u64 dirty_bytes; int track_uptodate; 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; }; #define INLINE_EXTENT_BUFFER_PAGES 16 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE) struct extent_buffer { u64 start; unsigned long len; unsigned long map_start; unsigned long map_len; unsigned long bflags; struct extent_io_tree *tree; spinlock_t refs_lock; atomic_t refs; atomic_t io_pages; int read_mirror; struct list_head leak_list; struct rcu_head rcu_head; pid_t lock_owner; /* 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; int lock_nested; /* 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; wait_queue_head_t lock_wq; struct page *inline_pages[INLINE_EXTENT_BUFFER_PAGES]; struct page **pages; }; 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 page *page, gfp_t mask); 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); int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, int bits, struct extent_state **cached); int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end); 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); int extent_read_full_page(struct extent_io_tree *tree, struct page *page, get_extent_t *get_extent, int mirror_num); 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, 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 clear_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 convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits, int clear_bits, 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 btree_write_cache_pages(struct address_space *mapping, 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 extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len); struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src); struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree, u64 start, unsigned long len); void free_extent_buffer(struct extent_buffer *eb); void free_extent_buffer_stale(struct extent_buffer *eb); #define WAIT_NONE 0 #define WAIT_COMPLETE 1 #define WAIT_PAGE_LOCK 2 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); unsigned long num_extent_pages(u64 start, u64 len); struct page *extent_buffer_page(struct extent_buffer *eb, unsigned long i); 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); void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits); void clear_extent_buffer_dirty(struct extent_buffer *eb); int set_extent_buffer_dirty(struct extent_buffer *eb); int set_extent_buffer_uptodate(struct extent_buffer *eb); int clear_extent_buffer_uptodate(struct extent_buffer *eb); int extent_buffer_uptodate(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 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); struct btrfs_mapping_tree; int repair_io_failure(struct btrfs_mapping_tree *map_tree, u64 start, u64 length, u64 logical, struct page *page, int mirror_num); int end_extent_writepage(struct page *page, int err, u64 start, u64 end); int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb, int mirror_num); #endif