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v4.6
  1#ifndef __EXTENTIO__
  2#define __EXTENTIO__
  3
  4#include <linux/rbtree.h>
  5#include "ulist.h"
  6
  7/* bits for the extent state */
  8#define EXTENT_DIRTY		(1U << 0)
  9#define EXTENT_WRITEBACK	(1U << 1)
 10#define EXTENT_UPTODATE		(1U << 2)
 11#define EXTENT_LOCKED		(1U << 3)
 12#define EXTENT_NEW		(1U << 4)
 13#define EXTENT_DELALLOC		(1U << 5)
 14#define EXTENT_DEFRAG		(1U << 6)
 15#define EXTENT_BOUNDARY		(1U << 9)
 16#define EXTENT_NODATASUM	(1U << 10)
 17#define EXTENT_DO_ACCOUNTING	(1U << 11)
 18#define EXTENT_FIRST_DELALLOC	(1U << 12)
 19#define EXTENT_NEED_WAIT	(1U << 13)
 20#define EXTENT_DAMAGED		(1U << 14)
 21#define EXTENT_NORESERVE	(1U << 15)
 22#define EXTENT_QGROUP_RESERVED	(1U << 16)
 
 23#define EXTENT_IOBITS		(EXTENT_LOCKED | EXTENT_WRITEBACK)
 24#define EXTENT_CTLBITS		(EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
 25
 26/*
 27 * flags for bio submission. The high bits indicate the compression
 28 * type for this bio
 29 */
 30#define EXTENT_BIO_COMPRESSED 1
 31#define EXTENT_BIO_TREE_LOG 2
 32#define EXTENT_BIO_FLAG_SHIFT 16
 33
 34/* these are bit numbers for test/set bit */
 35#define EXTENT_BUFFER_UPTODATE 0
 36#define EXTENT_BUFFER_DIRTY 2
 37#define EXTENT_BUFFER_CORRUPT 3
 38#define EXTENT_BUFFER_READAHEAD 4	/* this got triggered by readahead */
 39#define EXTENT_BUFFER_TREE_REF 5
 40#define EXTENT_BUFFER_STALE 6
 41#define EXTENT_BUFFER_WRITEBACK 7
 42#define EXTENT_BUFFER_READ_ERR 8        /* read IO error */
 43#define EXTENT_BUFFER_DUMMY 9
 44#define EXTENT_BUFFER_IN_TREE 10
 45#define EXTENT_BUFFER_WRITE_ERR 11    /* write IO error */
 46
 47/* these are flags for extent_clear_unlock_delalloc */
 48#define PAGE_UNLOCK		(1 << 0)
 49#define PAGE_CLEAR_DIRTY	(1 << 1)
 50#define PAGE_SET_WRITEBACK	(1 << 2)
 51#define PAGE_END_WRITEBACK	(1 << 3)
 52#define PAGE_SET_PRIVATE2	(1 << 4)
 53#define PAGE_SET_ERROR		(1 << 5)
 54
 55/*
 56 * page->private values.  Every page that is controlled by the extent
 57 * map has page->private set to one.
 58 */
 59#define EXTENT_PAGE_PRIVATE 1
 60
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 61struct extent_state;
 62struct btrfs_root;
 63struct btrfs_io_bio;
 64struct io_failure_record;
 65
 66typedef	int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
 67				       struct bio *bio, int mirror_num,
 68				       unsigned long bio_flags, u64 bio_offset);
 69struct extent_io_ops {
 70	int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
 71			     u64 start, u64 end, int *page_started,
 72			     unsigned long *nr_written);
 73	int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
 74	int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
 75	extent_submit_bio_hook_t *submit_bio_hook;
 76	int (*merge_bio_hook)(int rw, struct page *page, unsigned long offset,
 77			      size_t size, struct bio *bio,
 78			      unsigned long bio_flags);
 79	int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
 80	int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
 81				    struct page *page, u64 start, u64 end,
 82				    int mirror);
 83	int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
 84				      struct extent_state *state, int uptodate);
 85	void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
 86			     unsigned *bits);
 87	void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
 88			       unsigned *bits);
 89	void (*merge_extent_hook)(struct inode *inode,
 90				  struct extent_state *new,
 91				  struct extent_state *other);
 92	void (*split_extent_hook)(struct inode *inode,
 93				  struct extent_state *orig, u64 split);
 94};
 95
 96struct extent_io_tree {
 97	struct rb_root state;
 98	struct address_space *mapping;
 99	u64 dirty_bytes;
100	int track_uptodate;
101	spinlock_t lock;
102	const struct extent_io_ops *ops;
103};
104
105struct extent_state {
106	u64 start;
107	u64 end; /* inclusive */
108	struct rb_node rb_node;
109
110	/* ADD NEW ELEMENTS AFTER THIS */
111	wait_queue_head_t wq;
112	atomic_t refs;
113	unsigned state;
114
115	struct io_failure_record *failrec;
116
117#ifdef CONFIG_BTRFS_DEBUG
118	struct list_head leak_list;
119#endif
120};
121
122#define INLINE_EXTENT_BUFFER_PAGES 16
123#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE)
124struct extent_buffer {
125	u64 start;
126	unsigned long len;
127	unsigned long bflags;
128	struct btrfs_fs_info *fs_info;
129	spinlock_t refs_lock;
130	atomic_t refs;
131	atomic_t io_pages;
132	int read_mirror;
133	struct rcu_head rcu_head;
134	pid_t lock_owner;
135
136	/* count of read lock holders on the extent buffer */
137	atomic_t write_locks;
138	atomic_t read_locks;
139	atomic_t blocking_writers;
140	atomic_t blocking_readers;
141	atomic_t spinning_readers;
142	atomic_t spinning_writers;
143	short lock_nested;
144	/* >= 0 if eb belongs to a log tree, -1 otherwise */
145	short log_index;
146
147	/* protects write locks */
148	rwlock_t lock;
149
150	/* readers use lock_wq while they wait for the write
151	 * lock holders to unlock
152	 */
153	wait_queue_head_t write_lock_wq;
154
155	/* writers use read_lock_wq while they wait for readers
156	 * to unlock
157	 */
158	wait_queue_head_t read_lock_wq;
159	struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
160#ifdef CONFIG_BTRFS_DEBUG
161	struct list_head leak_list;
162#endif
163};
164
165/*
166 * Structure to record how many bytes and which ranges are set/cleared
167 */
168struct extent_changeset {
169	/* How many bytes are set/cleared in this operation */
170	u64 bytes_changed;
171
172	/* Changed ranges */
173	struct ulist *range_changed;
174};
175
176static inline void extent_set_compress_type(unsigned long *bio_flags,
177					    int compress_type)
178{
179	*bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
180}
181
182static inline int extent_compress_type(unsigned long bio_flags)
183{
184	return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
185}
186
187struct extent_map_tree;
188
189typedef struct extent_map *(get_extent_t)(struct inode *inode,
190					  struct page *page,
191					  size_t pg_offset,
192					  u64 start, u64 len,
193					  int create);
194
195void extent_io_tree_init(struct extent_io_tree *tree,
196			 struct address_space *mapping);
197int try_release_extent_mapping(struct extent_map_tree *map,
198			       struct extent_io_tree *tree, struct page *page,
199			       gfp_t mask);
200int try_release_extent_buffer(struct page *page);
201int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
202		     struct extent_state **cached);
203
204static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end)
205{
206	return lock_extent_bits(tree, start, end, NULL);
207}
208
209int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
210int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
211			  get_extent_t *get_extent, int mirror_num);
212int __init extent_io_init(void);
213void extent_io_exit(void);
214
215u64 count_range_bits(struct extent_io_tree *tree,
216		     u64 *start, u64 search_end,
217		     u64 max_bytes, unsigned bits, int contig);
218
219void free_extent_state(struct extent_state *state);
220int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
221		   unsigned bits, int filled,
222		   struct extent_state *cached_state);
223int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
224			     unsigned bits, gfp_t mask,
225			     struct extent_changeset *changeset);
226int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
227		     unsigned bits, int wake, int delete,
228		     struct extent_state **cached, gfp_t mask);
229
230static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end)
231{
232	return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL,
233				GFP_NOFS);
234}
235
236static inline int unlock_extent_cached(struct extent_io_tree *tree, u64 start,
237		u64 end, struct extent_state **cached, gfp_t mask)
238{
239	return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached,
240				mask);
241}
242
243static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start,
244		u64 end, unsigned bits, gfp_t mask)
245{
246	int wake = 0;
247
248	if (bits & EXTENT_LOCKED)
249		wake = 1;
250
251	return clear_extent_bit(tree, start, end, bits, wake, 0, NULL, mask);
 
252}
253
254int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
255			   unsigned bits, gfp_t mask,
256			   struct extent_changeset *changeset);
257int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
258		   unsigned bits, u64 *failed_start,
259		   struct extent_state **cached_state, gfp_t mask);
260
261static inline int set_extent_bits(struct extent_io_tree *tree, u64 start,
262		u64 end, unsigned bits, gfp_t mask)
263{
264	return set_extent_bit(tree, start, end, bits, NULL, NULL, mask);
265}
266
267static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
268		u64 end, struct extent_state **cached_state, gfp_t mask)
269{
270	return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0,
271				cached_state, mask);
272}
273
274static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start,
275		u64 end, gfp_t mask)
276{
277	return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL,
278			      NULL, mask);
279}
280
281static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
282		u64 end, gfp_t mask)
283{
284	return clear_extent_bit(tree, start, end,
285				EXTENT_DIRTY | EXTENT_DELALLOC |
286				EXTENT_DO_ACCOUNTING, 0, 0, NULL, mask);
287}
288
289int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
290		       unsigned bits, unsigned clear_bits,
291		       struct extent_state **cached_state, gfp_t mask);
292
293static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start,
294		u64 end, struct extent_state **cached_state, gfp_t mask)
295{
296	return set_extent_bit(tree, start, end,
297			      EXTENT_DELALLOC | EXTENT_UPTODATE,
298			      NULL, cached_state, mask);
299}
300
301static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start,
302		u64 end, struct extent_state **cached_state, gfp_t mask)
303{
304	return set_extent_bit(tree, start, end,
305			      EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG,
306			      NULL, cached_state, mask);
307}
308
309static inline int set_extent_new(struct extent_io_tree *tree, u64 start,
310		u64 end, gfp_t mask)
311{
312	return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL, mask);
 
313}
314
315static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start,
316		u64 end, struct extent_state **cached_state, gfp_t mask)
317{
318	return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL,
319			      cached_state, mask);
320}
321
322int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
323			  u64 *start_ret, u64 *end_ret, unsigned bits,
324			  struct extent_state **cached_state);
325int extent_invalidatepage(struct extent_io_tree *tree,
326			  struct page *page, unsigned long offset);
327int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
328			  get_extent_t *get_extent,
329			  struct writeback_control *wbc);
330int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
331			      u64 start, u64 end, get_extent_t *get_extent,
332			      int mode);
333int extent_writepages(struct extent_io_tree *tree,
334		      struct address_space *mapping,
335		      get_extent_t *get_extent,
336		      struct writeback_control *wbc);
337int btree_write_cache_pages(struct address_space *mapping,
338			    struct writeback_control *wbc);
339int extent_readpages(struct extent_io_tree *tree,
340		     struct address_space *mapping,
341		     struct list_head *pages, unsigned nr_pages,
342		     get_extent_t get_extent);
343int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
344		__u64 start, __u64 len, get_extent_t *get_extent);
345void set_page_extent_mapped(struct page *page);
346
347struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
348					  u64 start);
349struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
350						  u64 start, unsigned long len);
351struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
352						u64 start);
353struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
354struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
355					 u64 start);
356void free_extent_buffer(struct extent_buffer *eb);
357void free_extent_buffer_stale(struct extent_buffer *eb);
358#define WAIT_NONE	0
359#define WAIT_COMPLETE	1
360#define WAIT_PAGE_LOCK	2
361int read_extent_buffer_pages(struct extent_io_tree *tree,
362			     struct extent_buffer *eb, u64 start, int wait,
363			     get_extent_t *get_extent, int mirror_num);
364void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
365
366static inline unsigned long num_extent_pages(u64 start, u64 len)
367{
368	return ((start + len + PAGE_SIZE - 1) >> PAGE_SHIFT) -
369		(start >> PAGE_SHIFT);
370}
371
372static inline void extent_buffer_get(struct extent_buffer *eb)
373{
374	atomic_inc(&eb->refs);
375}
376
377int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
378			  unsigned long start,
379			  unsigned long len);
380void read_extent_buffer(struct extent_buffer *eb, void *dst,
381			unsigned long start,
382			unsigned long len);
383int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst,
384			       unsigned long start,
385			       unsigned long len);
 
 
 
386void write_extent_buffer(struct extent_buffer *eb, const void *src,
387			 unsigned long start, unsigned long len);
 
 
388void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
389			unsigned long dst_offset, unsigned long src_offset,
390			unsigned long len);
391void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
392			   unsigned long src_offset, unsigned long len);
393void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
394			   unsigned long src_offset, unsigned long len);
395void memset_extent_buffer(struct extent_buffer *eb, char c,
396			  unsigned long start, unsigned long len);
397int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
398			   unsigned long pos);
399void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
400			      unsigned long pos, unsigned long len);
401void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
402				unsigned long pos, unsigned long len);
403void clear_extent_buffer_dirty(struct extent_buffer *eb);
404int set_extent_buffer_dirty(struct extent_buffer *eb);
405void set_extent_buffer_uptodate(struct extent_buffer *eb);
406void clear_extent_buffer_uptodate(struct extent_buffer *eb);
407int extent_buffer_uptodate(struct extent_buffer *eb);
408int extent_buffer_under_io(struct extent_buffer *eb);
409int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
410		      unsigned long min_len, char **map,
411		      unsigned long *map_start,
412		      unsigned long *map_len);
413void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
414void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
415void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
416				 struct page *locked_page,
417				 unsigned bits_to_clear,
418				 unsigned long page_ops);
419struct bio *
420btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
421		gfp_t gfp_flags);
422struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
423struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
424
425struct btrfs_fs_info;
426
427int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical,
428		      struct page *page, unsigned int pg_offset,
429		      int mirror_num);
430int clean_io_failure(struct inode *inode, u64 start, struct page *page,
431		     unsigned int pg_offset);
432void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
433int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
434			 int mirror_num);
435
436/*
437 * When IO fails, either with EIO or csum verification fails, we
438 * try other mirrors that might have a good copy of the data.  This
439 * io_failure_record is used to record state as we go through all the
440 * mirrors.  If another mirror has good data, the page is set up to date
441 * and things continue.  If a good mirror can't be found, the original
442 * bio end_io callback is called to indicate things have failed.
443 */
444struct io_failure_record {
445	struct page *page;
446	u64 start;
447	u64 len;
448	u64 logical;
449	unsigned long bio_flags;
450	int this_mirror;
451	int failed_mirror;
452	int in_validation;
453};
454
455void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end);
456int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
457				struct io_failure_record **failrec_ret);
458int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio,
459			   struct io_failure_record *failrec, int fail_mirror);
460struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
461				    struct io_failure_record *failrec,
462				    struct page *page, int pg_offset, int icsum,
463				    bio_end_io_t *endio_func, void *data);
464int free_io_failure(struct inode *inode, struct io_failure_record *rec);
465#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
466noinline u64 find_lock_delalloc_range(struct inode *inode,
467				      struct extent_io_tree *tree,
468				      struct page *locked_page, u64 *start,
469				      u64 *end, u64 max_bytes);
470#endif
471struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
472					       u64 start);
473#endif
v4.10.11
  1#ifndef __EXTENTIO__
  2#define __EXTENTIO__
  3
  4#include <linux/rbtree.h>
  5#include "ulist.h"
  6
  7/* bits for the extent state */
  8#define EXTENT_DIRTY		(1U << 0)
  9#define EXTENT_WRITEBACK	(1U << 1)
 10#define EXTENT_UPTODATE		(1U << 2)
 11#define EXTENT_LOCKED		(1U << 3)
 12#define EXTENT_NEW		(1U << 4)
 13#define EXTENT_DELALLOC		(1U << 5)
 14#define EXTENT_DEFRAG		(1U << 6)
 15#define EXTENT_BOUNDARY		(1U << 9)
 16#define EXTENT_NODATASUM	(1U << 10)
 17#define EXTENT_DO_ACCOUNTING	(1U << 11)
 18#define EXTENT_FIRST_DELALLOC	(1U << 12)
 19#define EXTENT_NEED_WAIT	(1U << 13)
 20#define EXTENT_DAMAGED		(1U << 14)
 21#define EXTENT_NORESERVE	(1U << 15)
 22#define EXTENT_QGROUP_RESERVED	(1U << 16)
 23#define EXTENT_CLEAR_DATA_RESV	(1U << 17)
 24#define EXTENT_IOBITS		(EXTENT_LOCKED | EXTENT_WRITEBACK)
 25#define EXTENT_CTLBITS		(EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
 26
 27/*
 28 * flags for bio submission. The high bits indicate the compression
 29 * type for this bio
 30 */
 31#define EXTENT_BIO_COMPRESSED 1
 32#define EXTENT_BIO_TREE_LOG 2
 33#define EXTENT_BIO_FLAG_SHIFT 16
 34
 35/* these are bit numbers for test/set bit */
 36#define EXTENT_BUFFER_UPTODATE 0
 37#define EXTENT_BUFFER_DIRTY 2
 38#define EXTENT_BUFFER_CORRUPT 3
 39#define EXTENT_BUFFER_READAHEAD 4	/* this got triggered by readahead */
 40#define EXTENT_BUFFER_TREE_REF 5
 41#define EXTENT_BUFFER_STALE 6
 42#define EXTENT_BUFFER_WRITEBACK 7
 43#define EXTENT_BUFFER_READ_ERR 8        /* read IO error */
 44#define EXTENT_BUFFER_DUMMY 9
 45#define EXTENT_BUFFER_IN_TREE 10
 46#define EXTENT_BUFFER_WRITE_ERR 11    /* write IO error */
 47
 48/* these are flags for extent_clear_unlock_delalloc */
 49#define PAGE_UNLOCK		(1 << 0)
 50#define PAGE_CLEAR_DIRTY	(1 << 1)
 51#define PAGE_SET_WRITEBACK	(1 << 2)
 52#define PAGE_END_WRITEBACK	(1 << 3)
 53#define PAGE_SET_PRIVATE2	(1 << 4)
 54#define PAGE_SET_ERROR		(1 << 5)
 55
 56/*
 57 * page->private values.  Every page that is controlled by the extent
 58 * map has page->private set to one.
 59 */
 60#define EXTENT_PAGE_PRIVATE 1
 61
 62/*
 63 * The extent buffer bitmap operations are done with byte granularity instead of
 64 * word granularity for two reasons:
 65 * 1. The bitmaps must be little-endian on disk.
 66 * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
 67 *    single word in a bitmap may straddle two pages in the extent buffer.
 68 */
 69#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
 70#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
 71#define BITMAP_FIRST_BYTE_MASK(start) \
 72	((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
 73#define BITMAP_LAST_BYTE_MASK(nbits) \
 74	(BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
 75
 76static inline int le_test_bit(int nr, const u8 *addr)
 77{
 78	return 1U & (addr[BIT_BYTE(nr)] >> (nr & (BITS_PER_BYTE-1)));
 79}
 80
 81extern void le_bitmap_set(u8 *map, unsigned int start, int len);
 82extern void le_bitmap_clear(u8 *map, unsigned int start, int len);
 83
 84struct extent_state;
 85struct btrfs_root;
 86struct btrfs_io_bio;
 87struct io_failure_record;
 88
 89typedef	int (extent_submit_bio_hook_t)(struct inode *inode, struct bio *bio,
 90				       int mirror_num, unsigned long bio_flags,
 91				       u64 bio_offset);
 92struct extent_io_ops {
 93	int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
 94			     u64 start, u64 end, int *page_started,
 95			     unsigned long *nr_written);
 96	int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
 
 97	extent_submit_bio_hook_t *submit_bio_hook;
 98	int (*merge_bio_hook)(struct page *page, unsigned long offset,
 99			      size_t size, struct bio *bio,
100			      unsigned long bio_flags);
101	int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
102	int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
103				    struct page *page, u64 start, u64 end,
104				    int mirror);
105	int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
106				      struct extent_state *state, int uptodate);
107	void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
108			     unsigned *bits);
109	void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
110			       unsigned *bits);
111	void (*merge_extent_hook)(struct inode *inode,
112				  struct extent_state *new,
113				  struct extent_state *other);
114	void (*split_extent_hook)(struct inode *inode,
115				  struct extent_state *orig, u64 split);
116};
117
118struct extent_io_tree {
119	struct rb_root state;
120	struct address_space *mapping;
121	u64 dirty_bytes;
122	int track_uptodate;
123	spinlock_t lock;
124	const struct extent_io_ops *ops;
125};
126
127struct extent_state {
128	u64 start;
129	u64 end; /* inclusive */
130	struct rb_node rb_node;
131
132	/* ADD NEW ELEMENTS AFTER THIS */
133	wait_queue_head_t wq;
134	atomic_t refs;
135	unsigned state;
136
137	struct io_failure_record *failrec;
138
139#ifdef CONFIG_BTRFS_DEBUG
140	struct list_head leak_list;
141#endif
142};
143
144#define INLINE_EXTENT_BUFFER_PAGES 16
145#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE)
146struct extent_buffer {
147	u64 start;
148	unsigned long len;
149	unsigned long bflags;
150	struct btrfs_fs_info *fs_info;
151	spinlock_t refs_lock;
152	atomic_t refs;
153	atomic_t io_pages;
154	int read_mirror;
155	struct rcu_head rcu_head;
156	pid_t lock_owner;
157
158	/* count of read lock holders on the extent buffer */
159	atomic_t write_locks;
160	atomic_t read_locks;
161	atomic_t blocking_writers;
162	atomic_t blocking_readers;
163	atomic_t spinning_readers;
164	atomic_t spinning_writers;
165	short lock_nested;
166	/* >= 0 if eb belongs to a log tree, -1 otherwise */
167	short log_index;
168
169	/* protects write locks */
170	rwlock_t lock;
171
172	/* readers use lock_wq while they wait for the write
173	 * lock holders to unlock
174	 */
175	wait_queue_head_t write_lock_wq;
176
177	/* writers use read_lock_wq while they wait for readers
178	 * to unlock
179	 */
180	wait_queue_head_t read_lock_wq;
181	struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
182#ifdef CONFIG_BTRFS_DEBUG
183	struct list_head leak_list;
184#endif
185};
186
187/*
188 * Structure to record how many bytes and which ranges are set/cleared
189 */
190struct extent_changeset {
191	/* How many bytes are set/cleared in this operation */
192	u64 bytes_changed;
193
194	/* Changed ranges */
195	struct ulist *range_changed;
196};
197
198static inline void extent_set_compress_type(unsigned long *bio_flags,
199					    int compress_type)
200{
201	*bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
202}
203
204static inline int extent_compress_type(unsigned long bio_flags)
205{
206	return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
207}
208
209struct extent_map_tree;
210
211typedef struct extent_map *(get_extent_t)(struct inode *inode,
212					  struct page *page,
213					  size_t pg_offset,
214					  u64 start, u64 len,
215					  int create);
216
217void extent_io_tree_init(struct extent_io_tree *tree,
218			 struct address_space *mapping);
219int try_release_extent_mapping(struct extent_map_tree *map,
220			       struct extent_io_tree *tree, struct page *page,
221			       gfp_t mask);
222int try_release_extent_buffer(struct page *page);
223int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
224		     struct extent_state **cached);
225
226static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end)
227{
228	return lock_extent_bits(tree, start, end, NULL);
229}
230
231int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
232int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
233			  get_extent_t *get_extent, int mirror_num);
234int __init extent_io_init(void);
235void extent_io_exit(void);
236
237u64 count_range_bits(struct extent_io_tree *tree,
238		     u64 *start, u64 search_end,
239		     u64 max_bytes, unsigned bits, int contig);
240
241void free_extent_state(struct extent_state *state);
242int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
243		   unsigned bits, int filled,
244		   struct extent_state *cached_state);
245int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
246		unsigned bits, struct extent_changeset *changeset);
 
247int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
248		     unsigned bits, int wake, int delete,
249		     struct extent_state **cached, gfp_t mask);
250
251static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end)
252{
253	return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL,
254				GFP_NOFS);
255}
256
257static inline int unlock_extent_cached(struct extent_io_tree *tree, u64 start,
258		u64 end, struct extent_state **cached, gfp_t mask)
259{
260	return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached,
261				mask);
262}
263
264static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start,
265		u64 end, unsigned bits)
266{
267	int wake = 0;
268
269	if (bits & EXTENT_LOCKED)
270		wake = 1;
271
272	return clear_extent_bit(tree, start, end, bits, wake, 0, NULL,
273			GFP_NOFS);
274}
275
276int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
277			   unsigned bits, struct extent_changeset *changeset);
 
278int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
279		   unsigned bits, u64 *failed_start,
280		   struct extent_state **cached_state, gfp_t mask);
281
282static inline int set_extent_bits(struct extent_io_tree *tree, u64 start,
283		u64 end, unsigned bits)
284{
285	return set_extent_bit(tree, start, end, bits, NULL, NULL, GFP_NOFS);
286}
287
288static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
289		u64 end, struct extent_state **cached_state, gfp_t mask)
290{
291	return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0,
292				cached_state, mask);
293}
294
295static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start,
296		u64 end, gfp_t mask)
297{
298	return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL,
299			      NULL, mask);
300}
301
302static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
303		u64 end)
304{
305	return clear_extent_bit(tree, start, end,
306				EXTENT_DIRTY | EXTENT_DELALLOC |
307				EXTENT_DO_ACCOUNTING, 0, 0, NULL, GFP_NOFS);
308}
309
310int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
311		       unsigned bits, unsigned clear_bits,
312		       struct extent_state **cached_state);
313
314static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start,
315		u64 end, struct extent_state **cached_state)
316{
317	return set_extent_bit(tree, start, end,
318			      EXTENT_DELALLOC | EXTENT_UPTODATE,
319			      NULL, cached_state, GFP_NOFS);
320}
321
322static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start,
323		u64 end, struct extent_state **cached_state)
324{
325	return set_extent_bit(tree, start, end,
326			      EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG,
327			      NULL, cached_state, GFP_NOFS);
328}
329
330static inline int set_extent_new(struct extent_io_tree *tree, u64 start,
331		u64 end)
332{
333	return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL,
334			GFP_NOFS);
335}
336
337static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start,
338		u64 end, struct extent_state **cached_state, gfp_t mask)
339{
340	return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL,
341			      cached_state, mask);
342}
343
344int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
345			  u64 *start_ret, u64 *end_ret, unsigned bits,
346			  struct extent_state **cached_state);
347int extent_invalidatepage(struct extent_io_tree *tree,
348			  struct page *page, unsigned long offset);
349int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
350			  get_extent_t *get_extent,
351			  struct writeback_control *wbc);
352int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
353			      u64 start, u64 end, get_extent_t *get_extent,
354			      int mode);
355int extent_writepages(struct extent_io_tree *tree,
356		      struct address_space *mapping,
357		      get_extent_t *get_extent,
358		      struct writeback_control *wbc);
359int btree_write_cache_pages(struct address_space *mapping,
360			    struct writeback_control *wbc);
361int extent_readpages(struct extent_io_tree *tree,
362		     struct address_space *mapping,
363		     struct list_head *pages, unsigned nr_pages,
364		     get_extent_t get_extent);
365int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
366		__u64 start, __u64 len, get_extent_t *get_extent);
367void set_page_extent_mapped(struct page *page);
368
369struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
370					  u64 start);
371struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
372						  u64 start, unsigned long len);
373struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
374						u64 start);
375struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
376struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
377					 u64 start);
378void free_extent_buffer(struct extent_buffer *eb);
379void free_extent_buffer_stale(struct extent_buffer *eb);
380#define WAIT_NONE	0
381#define WAIT_COMPLETE	1
382#define WAIT_PAGE_LOCK	2
383int read_extent_buffer_pages(struct extent_io_tree *tree,
384			     struct extent_buffer *eb, int wait,
385			     get_extent_t *get_extent, int mirror_num);
386void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
387
388static inline unsigned long num_extent_pages(u64 start, u64 len)
389{
390	return ((start + len + PAGE_SIZE - 1) >> PAGE_SHIFT) -
391		(start >> PAGE_SHIFT);
392}
393
394static inline void extent_buffer_get(struct extent_buffer *eb)
395{
396	atomic_inc(&eb->refs);
397}
398
399int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
400			  unsigned long start,
401			  unsigned long len);
402void read_extent_buffer(struct extent_buffer *eb, void *dst,
403			unsigned long start,
404			unsigned long len);
405int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst,
406			       unsigned long start,
407			       unsigned long len);
408void write_extent_buffer_fsid(struct extent_buffer *eb, const void *src);
409void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb,
410		const void *src);
411void write_extent_buffer(struct extent_buffer *eb, const void *src,
412			 unsigned long start, unsigned long len);
413void copy_extent_buffer_full(struct extent_buffer *dst,
414			     struct extent_buffer *src);
415void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
416			unsigned long dst_offset, unsigned long src_offset,
417			unsigned long len);
418void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
419			   unsigned long src_offset, unsigned long len);
420void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
421			   unsigned long src_offset, unsigned long len);
422void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start,
423			   unsigned long len);
424int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
425			   unsigned long pos);
426void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
427			      unsigned long pos, unsigned long len);
428void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
429				unsigned long pos, unsigned long len);
430void clear_extent_buffer_dirty(struct extent_buffer *eb);
431int set_extent_buffer_dirty(struct extent_buffer *eb);
432void set_extent_buffer_uptodate(struct extent_buffer *eb);
433void clear_extent_buffer_uptodate(struct extent_buffer *eb);
434int extent_buffer_uptodate(struct extent_buffer *eb);
435int extent_buffer_under_io(struct extent_buffer *eb);
436int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
437		      unsigned long min_len, char **map,
438		      unsigned long *map_start,
439		      unsigned long *map_len);
440void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
441void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
442void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
443				 u64 delalloc_end, struct page *locked_page,
444				 unsigned bits_to_clear,
445				 unsigned long page_ops);
446struct bio *
447btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
448		gfp_t gfp_flags);
449struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
450struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
451
452struct btrfs_fs_info;
453
454int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical,
455		      struct page *page, unsigned int pg_offset,
456		      int mirror_num);
457int clean_io_failure(struct inode *inode, u64 start, struct page *page,
458		     unsigned int pg_offset);
459void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
460int repair_eb_io_failure(struct btrfs_fs_info *fs_info,
461			 struct extent_buffer *eb, int mirror_num);
462
463/*
464 * When IO fails, either with EIO or csum verification fails, we
465 * try other mirrors that might have a good copy of the data.  This
466 * io_failure_record is used to record state as we go through all the
467 * mirrors.  If another mirror has good data, the page is set up to date
468 * and things continue.  If a good mirror can't be found, the original
469 * bio end_io callback is called to indicate things have failed.
470 */
471struct io_failure_record {
472	struct page *page;
473	u64 start;
474	u64 len;
475	u64 logical;
476	unsigned long bio_flags;
477	int this_mirror;
478	int failed_mirror;
479	int in_validation;
480};
481
482void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end);
483int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
484				struct io_failure_record **failrec_ret);
485int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio,
486			   struct io_failure_record *failrec, int fail_mirror);
487struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
488				    struct io_failure_record *failrec,
489				    struct page *page, int pg_offset, int icsum,
490				    bio_end_io_t *endio_func, void *data);
491int free_io_failure(struct inode *inode, struct io_failure_record *rec);
492#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
493noinline u64 find_lock_delalloc_range(struct inode *inode,
494				      struct extent_io_tree *tree,
495				      struct page *locked_page, u64 *start,
496				      u64 *end, u64 max_bytes);
497#endif
498struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
499					       u64 start);
500#endif