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Release 4.11 fs/btrfs/extent_io.h

Directory: fs/btrfs
#ifndef __EXTENTIO__

#define __EXTENTIO__

#include <linux/rbtree.h>
#include "ulist.h"

/* bits for the extent state */

#define EXTENT_DIRTY		(1U << 0)

#define EXTENT_WRITEBACK	(1U << 1)

#define EXTENT_UPTODATE		(1U << 2)

#define EXTENT_LOCKED		(1U << 3)

#define EXTENT_NEW		(1U << 4)

#define EXTENT_DELALLOC		(1U << 5)

#define EXTENT_DEFRAG		(1U << 6)

#define EXTENT_BOUNDARY		(1U << 9)

#define EXTENT_NODATASUM	(1U << 10)

#define EXTENT_DO_ACCOUNTING	(1U << 11)

#define EXTENT_FIRST_DELALLOC	(1U << 12)

#define EXTENT_NEED_WAIT	(1U << 13)

#define EXTENT_DAMAGED		(1U << 14)

#define EXTENT_NORESERVE	(1U << 15)

#define EXTENT_QGROUP_RESERVED	(1U << 16)

#define EXTENT_CLEAR_DATA_RESV	(1U << 17)

#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_TREE_LOG 2

#define EXTENT_BIO_FLAG_SHIFT 16

/* these are bit numbers for test/set bit */

#define EXTENT_BUFFER_UPTODATE 0

#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_READ_ERR 8        
/* read IO error */

#define EXTENT_BUFFER_DUMMY 9

#define EXTENT_BUFFER_IN_TREE 10

#define EXTENT_BUFFER_WRITE_ERR 11    
/* write IO error */

/* these are flags for __process_pages_contig */

#define PAGE_UNLOCK		(1 << 0)

#define PAGE_CLEAR_DIRTY	(1 << 1)

#define PAGE_SET_WRITEBACK	(1 << 2)

#define PAGE_END_WRITEBACK	(1 << 3)

#define PAGE_SET_PRIVATE2	(1 << 4)

#define PAGE_SET_ERROR		(1 << 5)

#define PAGE_LOCK		(1 << 6)

/*
 * page->private values.  Every page that is controlled by the extent
 * map has page->private set to one.
 */

#define EXTENT_PAGE_PRIVATE 1

/*
 * The extent buffer bitmap operations are done with byte granularity instead of
 * word granularity for two reasons:
 * 1. The bitmaps must be little-endian on disk.
 * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
 *    single word in a bitmap may straddle two pages in the extent buffer.
 */

#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)

#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)

#define BITMAP_FIRST_BYTE_MASK(start) \
	((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)

#define BITMAP_LAST_BYTE_MASK(nbits) \
	(BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))


static inline int le_test_bit(int nr, const u8 *addr) { return 1U & (addr[BIT_BYTE(nr)] >> (nr & (BITS_PER_BYTE-1))); }

Contributors

PersonTokensPropCommitsCommitProp
Omar Sandoval38100.00%1100.00%
Total38100.00%1100.00%

extern void le_bitmap_set(u8 *map, unsigned int start, int len); extern void le_bitmap_clear(u8 *map, unsigned int start, int len); struct extent_state; struct btrfs_root; struct btrfs_inode; struct btrfs_io_bio; struct io_failure_record; typedef int (extent_submit_bio_hook_t)(struct inode *inode, struct bio *bio, int mirror_num, unsigned long bio_flags, u64 bio_offset); struct extent_io_ops { /* * The following callbacks must be allways defined, the function * pointer will be called unconditionally. */ extent_submit_bio_hook_t *submit_bio_hook; int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset, struct page *page, u64 start, u64 end, int mirror); int (*merge_bio_hook)(struct page *page, unsigned long offset, size_t size, struct bio *bio, unsigned long bio_flags); int (*readpage_io_failed_hook)(struct page *page, int failed_mirror); /* * Optional hooks, called if the pointer is not NULL */ 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); void (*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, unsigned *bits); void (*clear_bit_hook)(struct btrfs_inode *inode, struct extent_state *state, unsigned *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); }; struct extent_io_tree { struct rb_root state; struct address_space *mapping; u64 dirty_bytes; int track_uptodate; spinlock_t lock; const struct extent_io_ops *ops; }; struct extent_state { u64 start; u64 end; /* inclusive */ struct rb_node rb_node; /* ADD NEW ELEMENTS AFTER THIS */ wait_queue_head_t wq; atomic_t refs; unsigned state; struct io_failure_record *failrec; #ifdef CONFIG_BTRFS_DEBUG struct list_head leak_list; #endif }; #define INLINE_EXTENT_BUFFER_PAGES 16 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE) struct extent_buffer { u64 start; unsigned long len; unsigned long bflags; struct btrfs_fs_info *fs_info; spinlock_t refs_lock; atomic_t refs; atomic_t io_pages; int read_mirror; 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; short lock_nested; /* >= 0 if eb belongs to a log tree, -1 otherwise */ short log_index; /* 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; struct page *pages[INLINE_EXTENT_BUFFER_PAGES]; #ifdef CONFIG_BTRFS_DEBUG struct list_head leak_list; #endif }; /* * Structure to record how many bytes and which ranges are set/cleared */ struct extent_changeset { /* How many bytes are set/cleared in this operation */ u64 bytes_changed; /* Changed ranges */ struct ulist range_changed; };
static inline void extent_set_compress_type(unsigned long *bio_flags, int compress_type) { *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT; }

Contributors

PersonTokensPropCommitsCommitProp
Li Zefan22100.00%1100.00%
Total22100.00%1100.00%


static inline int extent_compress_type(unsigned long bio_flags) { return bio_flags >> EXTENT_BIO_FLAG_SHIFT; }

Contributors

PersonTokensPropCommitsCommitProp
Li Zefan16100.00%1100.00%
Total16100.00%1100.00%

struct extent_map_tree; typedef struct extent_map *(get_extent_t)(struct btrfs_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); int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, struct extent_state **cached);
static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end) { return lock_extent_bits(tree, start, end, NULL); }

Contributors

PersonTokensPropCommitsCommitProp
David Sterba1446.67%125.00%
Chris Mason1343.33%250.00%
Josef Bacik310.00%125.00%
Total30100.00%4100.00%

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 bits, int contig); void free_extent_state(struct extent_state *state); int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, unsigned bits, int filled, struct extent_state *cached_state); int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, unsigned bits, struct extent_changeset *changeset); int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, unsigned bits, int wake, int delete, struct extent_state **cached, gfp_t mask);
static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end) { return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL, GFP_NOFS); }

Contributors

PersonTokensPropCommitsCommitProp
David Sterba2668.42%133.33%
Chris Mason1128.95%133.33%
Qu Wenruo12.63%133.33%
Total38100.00%3100.00%


static inline int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end, struct extent_state **cached, gfp_t mask) { return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached, mask); }

Contributors

PersonTokensPropCommitsCommitProp
David Sterba3574.47%133.33%
Chris Mason1225.53%266.67%
Total47100.00%3100.00%


static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, unsigned bits) { int wake = 0; if (bits & EXTENT_LOCKED) wake = 1; return clear_extent_bit(tree, start, end, bits, wake, 0, NULL, GFP_NOFS); }

Contributors

PersonTokensPropCommitsCommitProp
David Sterba4173.21%360.00%
Chris Mason1526.79%240.00%
Total56100.00%5100.00%

int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, unsigned bits, struct extent_changeset *changeset); int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, unsigned bits, u64 *failed_start, struct extent_state **cached_state, gfp_t mask);
static inline int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, unsigned bits) { return set_extent_bit(tree, start, end, bits, NULL, NULL, GFP_NOFS); }

Contributors

PersonTokensPropCommitsCommitProp
David Sterba2564.10%250.00%
Chris Mason1435.90%250.00%
Total39100.00%4100.00%


static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, struct extent_state **cached_state, gfp_t mask) { return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0, cached_state, mask); }

Contributors

PersonTokensPropCommitsCommitProp
David Sterba2451.06%133.33%
Josef Bacik2246.81%133.33%
Chris Mason12.13%133.33%
Total47100.00%3100.00%


static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask) { return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL, NULL, mask); }

Contributors

PersonTokensPropCommitsCommitProp
David Sterba2358.97%133.33%
Chris Mason1538.46%133.33%
Josef Bacik12.56%133.33%
Total39100.00%3100.00%


static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end) { return clear_extent_bit(tree, start, end, EXTENT_DIRTY | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING, 0, 0, NULL, GFP_NOFS); }

Contributors

PersonTokensPropCommitsCommitProp
David Sterba2969.05%375.00%
Chris Mason1330.95%125.00%
Total42100.00%4100.00%

int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, unsigned bits, unsigned clear_bits, struct extent_state **cached_state);
static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, struct extent_state **cached_state) { return set_extent_bit(tree, start, end, EXTENT_DELALLOC | EXTENT_UPTODATE, NULL, cached_state, GFP_NOFS); }

Contributors

PersonTokensPropCommitsCommitProp
David Sterba2556.82%240.00%
Josef Bacik1840.91%240.00%
Chris Mason12.27%120.00%
Total44100.00%5100.00%


static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end, struct extent_state **cached_state) { return set_extent_bit(tree, start, end, EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG, NULL, cached_state, GFP_NOFS); }

Contributors

PersonTokensPropCommitsCommitProp
David Sterba2758.70%240.00%
Chris Mason1328.26%120.00%
Josef Bacik613.04%240.00%
Total46100.00%5100.00%


static inline int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end) { return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL, GFP_NOFS); }

Contributors

PersonTokensPropCommitsCommitProp
David Sterba3597.22%266.67%
Chris Mason12.78%133.33%
Total36100.00%3100.00%


static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, struct extent_state **cached_state, gfp_t mask) { return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL, cached_state, mask); }

Contributors

PersonTokensPropCommitsCommitProp
David Sterba2453.33%150.00%
Liu Bo2146.67%150.00%
Total45100.00%2100.00%

int find_first_extent_bit(struct extent_io_tree *tree, u64 start, u64 *start_ret, u64 *end_ret, unsigned bits, struct extent_state **cached_state); 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); void set_page_extent_mapped(struct page *page); struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start); 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 *find_extent_buffer(struct btrfs_fs_info *fs_info, u64 start); 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, int wait, get_extent_t *get_extent, int mirror_num); void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
static inline unsigned long num_extent_pages(u64 start, u64 len) { return ((start + len + PAGE_SIZE - 1) >> PAGE_SHIFT) - (start >> PAGE_SHIFT); }

Contributors

PersonTokensPropCommitsCommitProp
Robin Dong2262.86%133.33%
Jan Schmidt1028.57%133.33%
Kirill A. Shutemov38.57%133.33%
Total35100.00%3100.00%


static inline void extent_buffer_get(struct extent_buffer *eb) { atomic_inc(&eb->refs); }

Contributors

PersonTokensPropCommitsCommitProp
Chris Mason20100.00%1100.00%
Total20100.00%1100.00%

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); int read_extent_buffer_to_user(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, const void *src); void write_extent_buffer(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, 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, unsigned long len); int extent_buffer_test_bit(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, unsigned long pos, unsigned long len); void clear_extent_buffer_dirty(struct extent_buffer *eb); int 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_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); 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, u64 delalloc_end, struct page *locked_page, unsigned bits_to_clear, unsigned long page_ops); struct bio * btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, gfp_t gfp_flags); struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs); struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask); struct btrfs_fs_info; struct btrfs_inode; int repair_io_failure(struct btrfs_inode *inode, u64 start, u64 length, u64 logical, struct page *page, unsigned int pg_offset, int mirror_num); int clean_io_failure(struct btrfs_inode *inode, u64 start, struct page *page, unsigned int pg_offset); void end_extent_writepage(struct page *page, int err, u64 start, u64 end); int repair_eb_io_failure(struct btrfs_fs_info *fs_info, struct extent_buffer *eb, int mirror_num); /* * When IO fails, either with EIO or csum verification fails, we * try other mirrors that might have a good copy of the data. This * io_failure_record is used to record state as we go through all the * mirrors. If another mirror has good data, the page is set up to date * and things continue. If a good mirror can't be found, the original * bio end_io callback is called to indicate things have failed. */ struct io_failure_record { struct page *page; u64 start; u64 len; u64 logical; unsigned long bio_flags; int this_mirror; int failed_mirror; int in_validation; }; void btrfs_free_io_failure_record(struct btrfs_inode *inode, u64 start, u64 end); int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end, struct io_failure_record **failrec_ret); int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio, struct io_failure_record *failrec, int fail_mirror); struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio, struct io_failure_record *failrec, struct page *page, int pg_offset, int icsum, bio_end_io_t *endio_func, void *data); int free_io_failure(struct btrfs_inode *inode, struct io_failure_record *rec); #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS noinline u64 find_lock_delalloc_range(struct inode *inode, struct extent_io_tree *tree, struct page *locked_page, u64 *start, u64 *end, u64 max_bytes); #endif struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info, u64 start); #endif

Overall Contributors

PersonTokensPropCommitsCommitProp
Chris Mason122143.94%3123.66%
David Sterba50318.10%2821.37%
Josef Bacik29810.72%2317.56%
Miao Xie1926.91%86.11%
Omar Sandoval1756.30%32.29%
Qu Wenruo692.48%53.82%
Jan Schmidt662.37%43.05%
Li Zefan431.55%10.76%
Liu Bo270.97%21.53%
Jeff Mahoney250.90%43.05%
Yehuda Sadeh Weinraub230.83%10.76%
Gerhard Heift220.79%10.76%
Arne Jansen220.79%32.29%
Robin Dong220.79%10.76%
Zheng Yan190.68%32.29%
Filipe David Borba Manana160.58%21.53%
Eric Sandeen140.50%10.76%
Nikolay Borisov120.43%64.58%
Kirill A. Shutemov40.14%10.76%
Xiaoguang Wang40.14%10.76%
Stefan Behrens10.04%10.76%
Mark Fasheh10.04%10.76%
Total2779100.00%131100.00%
Directory: fs/btrfs
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