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author | Lachlan McIlroy <lachlan@redback.melbourne.sgi.com> | 2009-01-14 16:29:51 +1100 |
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committer | Lachlan McIlroy <lachlan@redback.melbourne.sgi.com> | 2009-01-14 16:29:51 +1100 |
commit | cb7a97d01521797cad9f63e8478403c3e51fea49 (patch) | |
tree | 84cddf20369f82f10c1c3712e6cce20dd1b9d863 /fs/btrfs/extent_io.h | |
parent | 0335cb76aa3fa913a2164bc9b669e5aef9d56fa3 (diff) | |
parent | a6525042bfdfcab128bd91fad264de10fd24a55e (diff) | |
download | linux-cb7a97d01521797cad9f63e8478403c3e51fea49.tar.bz2 |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 into for-linus
Diffstat (limited to 'fs/btrfs/extent_io.h')
-rw-r--r-- | fs/btrfs/extent_io.h | 269 |
1 files changed, 269 insertions, 0 deletions
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h new file mode 100644 index 000000000000..c5b483a79137 --- /dev/null +++ b/fs/btrfs/extent_io.h @@ -0,0 +1,269 @@ +#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_ORDERED (1 << 9) +#define EXTENT_ORDERED_METADATA (1 << 10) +#define EXTENT_BOUNDARY (1 << 11) +#define EXTENT_NODATASUM (1 << 12) +#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK) + +/* flags for bio submission */ +#define EXTENT_BIO_COMPRESSED 1 + +/* + * 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); +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); + int (*set_bit_hook)(struct inode *inode, u64 start, u64 end, + unsigned long old, unsigned long bits); + int (*clear_bit_hook)(struct inode *inode, u64 start, u64 end, + unsigned long old, unsigned long bits); + int (*write_cache_pages_lock_hook)(struct page *page); +}; + +struct extent_io_tree { + struct rb_root state; + struct rb_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; + 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; + char *map_token; + char *kaddr; + unsigned long map_start; + unsigned long map_len; + struct page *first_page; + atomic_t refs; + int flags; + struct list_head leak_list; + struct rb_node rb_node; + struct mutex mutex; +}; + +struct extent_map_tree; + +static inline struct extent_state *extent_state_next(struct extent_state *state) +{ + struct rb_node *node; + node = rb_next(&state->rb_node); + if (!node) + return NULL; + return rb_entry(node, struct extent_state, rb_node); +} + +typedef struct extent_map *(get_extent_t)(struct inode *inode, + struct page *page, + size_t page_offset, + u64 start, u64 len, + int create); + +void extent_io_tree_init(struct extent_io_tree *tree, + struct address_space *mapping, gfp_t mask); +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 unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, 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 test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, + int bits, int filled); +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, gfp_t mask); +int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, + int bits, gfp_t mask); +int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, + 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 clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end, + gfp_t mask); +int clear_extent_ordered_metadata(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, + gfp_t mask); +int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end, + 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_prepare_write(struct extent_io_tree *tree, + struct inode *inode, struct page *page, + unsigned from, unsigned to, get_extent_t *get_extent); +int extent_commit_write(struct extent_io_tree *tree, + struct inode *inode, struct page *page, + unsigned from, unsigned to); +sector_t extent_bmap(struct address_space *mapping, sector_t iblock, + get_extent_t *get_extent); +int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end); +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, + gfp_t mask); +struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree, + u64 start, unsigned long len, + gfp_t mask); +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_on_extent_buffer_writeback(struct extent_io_tree *tree, + struct extent_buffer *eb); +int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end); +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); +int extent_buffer_uptodate(struct extent_io_tree *tree, + struct extent_buffer *eb); +int map_extent_buffer(struct extent_buffer *eb, unsigned long offset, + unsigned long min_len, char **token, char **map, + unsigned long *map_start, + unsigned long *map_len, int km); +int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset, + unsigned long min_len, char **token, char **map, + unsigned long *map_start, + unsigned long *map_len, int km); +void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km); +int release_extent_buffer_tail_pages(struct extent_buffer *eb); +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, + int unlock_page, + int clear_unlock, + int clear_delalloc, int clear_dirty, + int set_writeback, + int end_writeback); +#endif |