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v6.13.7
  1/* SPDX-License-Identifier: GPL-2.0 */
  2
  3#ifndef BTRFS_EXTENT_IO_H
  4#define BTRFS_EXTENT_IO_H
  5
  6#include <linux/rbtree.h>
  7#include <linux/refcount.h>
  8#include <linux/fiemap.h>
  9#include <linux/btrfs_tree.h>
 10#include <linux/spinlock.h>
 11#include <linux/atomic.h>
 12#include <linux/rwsem.h>
 13#include <linux/list.h>
 14#include <linux/slab.h>
 15#include "compression.h"
 16#include "messages.h"
 17#include "ulist.h"
 18#include "misc.h"
 19
 20struct page;
 21struct file;
 22struct folio;
 23struct inode;
 24struct fiemap_extent_info;
 25struct readahead_control;
 26struct address_space;
 27struct writeback_control;
 28struct extent_io_tree;
 29struct extent_map_tree;
 30struct extent_state;
 31struct btrfs_block_group;
 32struct btrfs_fs_info;
 33struct btrfs_inode;
 34struct btrfs_root;
 35struct btrfs_trans_handle;
 36struct btrfs_tree_parent_check;
 37
 38enum {
 39	EXTENT_BUFFER_UPTODATE,
 40	EXTENT_BUFFER_DIRTY,
 41	EXTENT_BUFFER_CORRUPT,
 42	/* this got triggered by readahead */
 43	EXTENT_BUFFER_READAHEAD,
 44	EXTENT_BUFFER_TREE_REF,
 45	EXTENT_BUFFER_STALE,
 46	EXTENT_BUFFER_WRITEBACK,
 47	/* read IO error */
 48	EXTENT_BUFFER_READ_ERR,
 49	EXTENT_BUFFER_UNMAPPED,
 50	EXTENT_BUFFER_IN_TREE,
 51	/* write IO error */
 52	EXTENT_BUFFER_WRITE_ERR,
 53	/* Indicate the extent buffer is written zeroed out (for zoned) */
 54	EXTENT_BUFFER_ZONED_ZEROOUT,
 55	/* Indicate that extent buffer pages a being read */
 56	EXTENT_BUFFER_READING,
 57};
 58
 59/* these are flags for __process_pages_contig */
 60enum {
 61	ENUM_BIT(PAGE_UNLOCK),
 62	/* Page starts writeback, clear dirty bit and set writeback bit */
 63	ENUM_BIT(PAGE_START_WRITEBACK),
 64	ENUM_BIT(PAGE_END_WRITEBACK),
 65	ENUM_BIT(PAGE_SET_ORDERED),
 66};
 67
 68/*
 69 * Folio private values.  Every page that is controlled by the extent map has
 70 * folio private set to this value.
 71 */
 72#define EXTENT_FOLIO_PRIVATE			1
 73
 74/*
 75 * The extent buffer bitmap operations are done with byte granularity instead of
 76 * word granularity for two reasons:
 77 * 1. The bitmaps must be little-endian on disk.
 78 * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
 79 *    single word in a bitmap may straddle two pages in the extent buffer.
 80 */
 81#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
 82#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
 83#define BITMAP_FIRST_BYTE_MASK(start) \
 84	((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
 85#define BITMAP_LAST_BYTE_MASK(nbits) \
 86	(BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
 87
 
 
 
 
 
 88
 89int __init extent_buffer_init_cachep(void);
 90void __cold extent_buffer_free_cachep(void);
 
 91
 92#define INLINE_EXTENT_BUFFER_PAGES     (BTRFS_MAX_METADATA_BLOCKSIZE / PAGE_SIZE)
 93struct extent_buffer {
 94	u64 start;
 95	u32 len;
 96	u32 folio_size;
 97	unsigned long bflags;
 98	struct btrfs_fs_info *fs_info;
 99
 
100	/*
101	 * The address where the eb can be accessed without any cross-page handling.
102	 * This can be NULL if not possible.
103	 */
104	void *addr;
 
 
 
 
 
105
 
 
 
 
 
 
 
106	spinlock_t refs_lock;
107	atomic_t refs;
 
108	int read_mirror;
109	/* >= 0 if eb belongs to a log tree, -1 otherwise */
110	s8 log_index;
111	u8 folio_shift;
112	struct rcu_head rcu_head;
113
114	struct rw_semaphore lock;
115
116	/*
117	 * Pointers to all the folios of the extent buffer.
118	 *
119	 * For now the folio is always order 0 (aka, a single page).
120	 */
121	struct folio *folios[INLINE_EXTENT_BUFFER_PAGES];
122#ifdef CONFIG_BTRFS_DEBUG
123	struct list_head leak_list;
124	pid_t lock_owner;
125#endif
126};
127
128struct btrfs_eb_write_context {
129	struct writeback_control *wbc;
130	struct extent_buffer *eb;
131	/* Block group @eb resides in. Only used for zoned mode. */
132	struct btrfs_block_group *zoned_bg;
133};
134
135static inline unsigned long offset_in_eb_folio(const struct extent_buffer *eb,
136					       u64 start)
137{
138	ASSERT(eb->folio_size);
139	return start & (eb->folio_size - 1);
140}
141
142/*
143 * Get the correct offset inside the page of extent buffer.
144 *
145 * @eb:		target extent buffer
146 * @start:	offset inside the extent buffer
147 *
148 * Will handle both sectorsize == PAGE_SIZE and sectorsize < PAGE_SIZE cases.
149 */
150static inline size_t get_eb_offset_in_folio(const struct extent_buffer *eb,
151					    unsigned long offset)
152{
153	/*
154	 * 1) sectorsize == PAGE_SIZE and nodesize >= PAGE_SIZE case
155	 *    1.1) One large folio covering the whole eb
156	 *	   The eb->start is aligned to folio size, thus adding it
157	 *	   won't cause any difference.
158	 *    1.2) Several page sized folios
159	 *	   The eb->start is aligned to folio (page) size, thus
160	 *	   adding it won't cause any difference.
161	 *
162	 * 2) sectorsize < PAGE_SIZE and nodesize < PAGE_SIZE case
163	 *    In this case there would only be one page sized folio, and there
164	 *    may be several different extent buffers in the page/folio.
165	 *    We need to add eb->start to properly access the offset inside
166	 *    that eb.
167	 */
168	return offset_in_folio(eb->folios[0], offset + eb->start);
169}
170
171static inline unsigned long get_eb_folio_index(const struct extent_buffer *eb,
172					       unsigned long offset)
173{
174	/*
175	 * 1) sectorsize == PAGE_SIZE and nodesize >= PAGE_SIZE case
176	 *    1.1) One large folio covering the whole eb.
177	 *	   the folio_shift would be large enough to always make us
178	 *	   return 0 as index.
179	 *    1.2) Several page sized folios
180	 *         The folio_shift would be PAGE_SHIFT, giving us the correct
181	 *         index.
182	 *
183	 * 2) sectorsize < PAGE_SIZE and nodesize < PAGE_SIZE case
184	 *    The folio would only be page sized, and always give us 0 as index.
185	 */
186	return offset >> eb->folio_shift;
187}
 
 
 
 
 
 
 
 
188
189/*
190 * Structure to record how many bytes and which ranges are set/cleared
191 */
192struct extent_changeset {
193	/* How many bytes are set/cleared in this operation */
194	u64 bytes_changed;
195
196	/* Changed ranges */
197	struct ulist range_changed;
198};
199
200static inline void extent_changeset_init(struct extent_changeset *changeset)
201{
202	changeset->bytes_changed = 0;
203	ulist_init(&changeset->range_changed);
204}
205
206static inline struct extent_changeset *extent_changeset_alloc(void)
207{
208	struct extent_changeset *ret;
209
210	ret = kmalloc(sizeof(*ret), GFP_KERNEL);
211	if (!ret)
212		return NULL;
213
214	extent_changeset_init(ret);
215	return ret;
216}
217
218static inline void extent_changeset_prealloc(struct extent_changeset *changeset, gfp_t gfp_mask)
219{
220	ulist_prealloc(&changeset->range_changed, gfp_mask);
221}
222
223static inline void extent_changeset_release(struct extent_changeset *changeset)
224{
225	if (!changeset)
226		return;
227	changeset->bytes_changed = 0;
228	ulist_release(&changeset->range_changed);
229}
230
231static inline void extent_changeset_free(struct extent_changeset *changeset)
232{
233	if (!changeset)
234		return;
235	extent_changeset_release(changeset);
236	kfree(changeset);
237}
238
239bool try_release_extent_mapping(struct folio *folio, gfp_t mask);
240int try_release_extent_buffer(struct folio *folio);
 
 
 
241
242int btrfs_read_folio(struct file *file, struct folio *folio);
243void extent_write_locked_range(struct inode *inode, const struct folio *locked_folio,
244			       u64 start, u64 end, struct writeback_control *wbc,
245			       bool pages_dirty);
246int btrfs_writepages(struct address_space *mapping, struct writeback_control *wbc);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
247int btree_write_cache_pages(struct address_space *mapping,
248			    struct writeback_control *wbc);
249void btrfs_readahead(struct readahead_control *rac);
250int set_folio_extent_mapped(struct folio *folio);
251int set_page_extent_mapped(struct page *page);
252void clear_folio_extent_mapped(struct folio *folio);
253
254struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
255					  u64 start, u64 owner_root, int level);
256struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
257						  u64 start, unsigned long len);
258struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
259						u64 start);
260struct extent_buffer *btrfs_clone_extent_buffer(const struct extent_buffer *src);
261struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
262					 u64 start);
263void free_extent_buffer(struct extent_buffer *eb);
264void free_extent_buffer_stale(struct extent_buffer *eb);
265#define WAIT_NONE	0
266#define WAIT_COMPLETE	1
267#define WAIT_PAGE_LOCK	2
268int read_extent_buffer_pages(struct extent_buffer *eb, int wait, int mirror_num,
269			     const struct btrfs_tree_parent_check *parent_check);
270void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
271void btrfs_readahead_tree_block(struct btrfs_fs_info *fs_info,
272				u64 bytenr, u64 owner_root, u64 gen, int level);
273void btrfs_readahead_node_child(struct extent_buffer *node, int slot);
274
275static inline int num_extent_pages(const struct extent_buffer *eb)
276{
277	/*
278	 * For sectorsize == PAGE_SIZE case, since nodesize is always aligned to
279	 * sectorsize, it's just eb->len >> PAGE_SHIFT.
280	 *
281	 * For sectorsize < PAGE_SIZE case, we could have nodesize < PAGE_SIZE,
282	 * thus have to ensure we get at least one page.
283	 */
284	return (eb->len >> PAGE_SHIFT) ?: 1;
285}
286
287/*
288 * This can only be determined at runtime by checking eb::folios[0].
289 *
290 * As we can have either one large folio covering the whole eb
291 * (either nodesize <= PAGE_SIZE, or high order folio), or multiple
292 * single-paged folios.
293 */
294static inline int num_extent_folios(const struct extent_buffer *eb)
295{
296	if (folio_order(eb->folios[0]))
297		return 1;
298	return num_extent_pages(eb);
299}
300
301static inline int extent_buffer_uptodate(const struct extent_buffer *eb)
302{
303	return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
304}
305
306int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
307			 unsigned long start, unsigned long len);
308void read_extent_buffer(const struct extent_buffer *eb, void *dst,
309			unsigned long start,
310			unsigned long len);
311int read_extent_buffer_to_user_nofault(const struct extent_buffer *eb,
312				       void __user *dst, unsigned long start,
313				       unsigned long len);
 
 
 
314void write_extent_buffer(const struct extent_buffer *eb, const void *src,
315			 unsigned long start, unsigned long len);
316
317static inline void write_extent_buffer_chunk_tree_uuid(
318		const struct extent_buffer *eb, const void *chunk_tree_uuid)
319{
320	write_extent_buffer(eb, chunk_tree_uuid,
321			    offsetof(struct btrfs_header, chunk_tree_uuid),
322			    BTRFS_FSID_SIZE);
323}
324
325static inline void write_extent_buffer_fsid(const struct extent_buffer *eb,
326					    const void *fsid)
327{
328	write_extent_buffer(eb, fsid, offsetof(struct btrfs_header, fsid),
329			    BTRFS_FSID_SIZE);
330}
331
332void copy_extent_buffer_full(const struct extent_buffer *dst,
333			     const struct extent_buffer *src);
334void copy_extent_buffer(const struct extent_buffer *dst,
335			const struct extent_buffer *src,
336			unsigned long dst_offset, unsigned long src_offset,
337			unsigned long len);
338void memcpy_extent_buffer(const struct extent_buffer *dst,
339			  unsigned long dst_offset, unsigned long src_offset,
340			  unsigned long len);
341void memmove_extent_buffer(const struct extent_buffer *dst,
342			   unsigned long dst_offset, unsigned long src_offset,
343			   unsigned long len);
344void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start,
345			   unsigned long len);
346int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start,
347			   unsigned long pos);
348void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start,
349			      unsigned long pos, unsigned long len);
350void extent_buffer_bitmap_clear(const struct extent_buffer *eb,
351				unsigned long start, unsigned long pos,
352				unsigned long len);
353void set_extent_buffer_dirty(struct extent_buffer *eb);
 
354void set_extent_buffer_uptodate(struct extent_buffer *eb);
355void clear_extent_buffer_uptodate(struct extent_buffer *eb);
 
 
 
356void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
357				  const struct folio *locked_folio,
358				  struct extent_state **cached,
359				  u32 bits_to_clear, unsigned long page_ops);
360int extent_invalidate_folio(struct extent_io_tree *tree,
361			    struct folio *folio, size_t offset);
362void btrfs_clear_buffer_dirty(struct btrfs_trans_handle *trans,
363			      struct extent_buffer *buf);
364
365int btrfs_alloc_page_array(unsigned int nr_pages, struct page **page_array,
366			   bool nofail);
367int btrfs_alloc_folio_array(unsigned int nr_folios, struct folio **folio_array);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
368
369#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
370bool find_lock_delalloc_range(struct inode *inode,
371			      struct folio *locked_folio, u64 *start,
372			     u64 *end);
373#endif
374struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
375					       u64 start);
376
377#ifdef CONFIG_BTRFS_DEBUG
378void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info);
379#else
380#define btrfs_extent_buffer_leak_debug_check(fs_info)	do {} while (0)
381#endif
382
383#endif
v5.9
  1/* SPDX-License-Identifier: GPL-2.0 */
  2
  3#ifndef BTRFS_EXTENT_IO_H
  4#define BTRFS_EXTENT_IO_H
  5
  6#include <linux/rbtree.h>
  7#include <linux/refcount.h>
  8#include <linux/fiemap.h>
 
 
 
 
 
 
 
 
  9#include "ulist.h"
 
 10
 11/*
 12 * flags for bio submission. The high bits indicate the compression
 13 * type for this bio
 14 */
 15#define EXTENT_BIO_COMPRESSED 1
 16#define EXTENT_BIO_FLAG_SHIFT 16
 
 
 
 
 
 
 
 
 
 
 
 17
 18enum {
 19	EXTENT_BUFFER_UPTODATE,
 20	EXTENT_BUFFER_DIRTY,
 21	EXTENT_BUFFER_CORRUPT,
 22	/* this got triggered by readahead */
 23	EXTENT_BUFFER_READAHEAD,
 24	EXTENT_BUFFER_TREE_REF,
 25	EXTENT_BUFFER_STALE,
 26	EXTENT_BUFFER_WRITEBACK,
 27	/* read IO error */
 28	EXTENT_BUFFER_READ_ERR,
 29	EXTENT_BUFFER_UNMAPPED,
 30	EXTENT_BUFFER_IN_TREE,
 31	/* write IO error */
 32	EXTENT_BUFFER_WRITE_ERR,
 
 
 
 
 33};
 34
 35/* these are flags for __process_pages_contig */
 36#define PAGE_UNLOCK		(1 << 0)
 37#define PAGE_CLEAR_DIRTY	(1 << 1)
 38#define PAGE_SET_WRITEBACK	(1 << 2)
 39#define PAGE_END_WRITEBACK	(1 << 3)
 40#define PAGE_SET_PRIVATE2	(1 << 4)
 41#define PAGE_SET_ERROR		(1 << 5)
 42#define PAGE_LOCK		(1 << 6)
 43
 44/*
 45 * page->private values.  Every page that is controlled by the extent
 46 * map has page->private set to one.
 47 */
 48#define EXTENT_PAGE_PRIVATE 1
 49
 50/*
 51 * The extent buffer bitmap operations are done with byte granularity instead of
 52 * word granularity for two reasons:
 53 * 1. The bitmaps must be little-endian on disk.
 54 * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
 55 *    single word in a bitmap may straddle two pages in the extent buffer.
 56 */
 57#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
 58#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
 59#define BITMAP_FIRST_BYTE_MASK(start) \
 60	((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
 61#define BITMAP_LAST_BYTE_MASK(nbits) \
 62	(BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
 63
 64struct btrfs_root;
 65struct btrfs_inode;
 66struct btrfs_io_bio;
 67struct io_failure_record;
 68struct extent_io_tree;
 69
 70typedef blk_status_t (submit_bio_hook_t)(struct inode *inode, struct bio *bio,
 71					 int mirror_num,
 72					 unsigned long bio_flags);
 73
 74typedef blk_status_t (extent_submit_bio_start_t)(void *private_data,
 75		struct bio *bio, u64 bio_offset);
 
 
 
 
 
 76
 77struct extent_io_ops {
 78	/*
 79	 * The following callbacks must be always defined, the function
 80	 * pointer will be called unconditionally.
 81	 */
 82	submit_bio_hook_t *submit_bio_hook;
 83	int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
 84				    struct page *page, u64 start, u64 end,
 85				    int mirror);
 86};
 87
 88
 89#define INLINE_EXTENT_BUFFER_PAGES 16
 90#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE)
 91struct extent_buffer {
 92	u64 start;
 93	unsigned long len;
 94	unsigned long bflags;
 95	struct btrfs_fs_info *fs_info;
 96	spinlock_t refs_lock;
 97	atomic_t refs;
 98	atomic_t io_pages;
 99	int read_mirror;
 
 
 
100	struct rcu_head rcu_head;
 
 
 
 
 
 
 
 
 
 
 
101	pid_t lock_owner;
 
 
102
103	int blocking_writers;
104	atomic_t blocking_readers;
105	bool lock_nested;
106	/* >= 0 if eb belongs to a log tree, -1 otherwise */
107	short log_index;
 
108
109	/* protects write locks */
110	rwlock_t lock;
 
 
 
 
111
112	/* readers use lock_wq while they wait for the write
113	 * lock holders to unlock
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
114	 */
115	wait_queue_head_t write_lock_wq;
 
116
117	/* writers use read_lock_wq while they wait for readers
118	 * to unlock
 
 
 
 
 
 
 
 
 
 
 
 
119	 */
120	wait_queue_head_t read_lock_wq;
121	struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
122#ifdef CONFIG_BTRFS_DEBUG
123	int spinning_writers;
124	atomic_t spinning_readers;
125	atomic_t read_locks;
126	int write_locks;
127	struct list_head leak_list;
128#endif
129};
130
131/*
132 * Structure to record how many bytes and which ranges are set/cleared
133 */
134struct extent_changeset {
135	/* How many bytes are set/cleared in this operation */
136	unsigned int bytes_changed;
137
138	/* Changed ranges */
139	struct ulist range_changed;
140};
141
142static inline void extent_changeset_init(struct extent_changeset *changeset)
143{
144	changeset->bytes_changed = 0;
145	ulist_init(&changeset->range_changed);
146}
147
148static inline struct extent_changeset *extent_changeset_alloc(void)
149{
150	struct extent_changeset *ret;
151
152	ret = kmalloc(sizeof(*ret), GFP_KERNEL);
153	if (!ret)
154		return NULL;
155
156	extent_changeset_init(ret);
157	return ret;
158}
159
 
 
 
 
 
160static inline void extent_changeset_release(struct extent_changeset *changeset)
161{
162	if (!changeset)
163		return;
164	changeset->bytes_changed = 0;
165	ulist_release(&changeset->range_changed);
166}
167
168static inline void extent_changeset_free(struct extent_changeset *changeset)
169{
170	if (!changeset)
171		return;
172	extent_changeset_release(changeset);
173	kfree(changeset);
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 btrfs_inode *inode,
190					  struct page *page, size_t pg_offset,
191					  u64 start, u64 len);
192
193int try_release_extent_mapping(struct page *page, gfp_t mask);
194int try_release_extent_buffer(struct page *page);
195
196int extent_read_full_page(struct page *page, get_extent_t *get_extent,
197			  int mirror_num);
198int extent_write_full_page(struct page *page, struct writeback_control *wbc);
199int extent_write_locked_range(struct inode *inode, u64 start, u64 end,
200			      int mode);
201int extent_writepages(struct address_space *mapping,
202		      struct writeback_control *wbc);
203int btree_write_cache_pages(struct address_space *mapping,
204			    struct writeback_control *wbc);
205void extent_readahead(struct readahead_control *rac);
206int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
207		  u64 start, u64 len);
208void set_page_extent_mapped(struct page *page);
209
210struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
211					  u64 start);
212struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
213						  u64 start, unsigned long len);
214struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
215						u64 start);
216struct extent_buffer *btrfs_clone_extent_buffer(const struct extent_buffer *src);
217struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
218					 u64 start);
219void free_extent_buffer(struct extent_buffer *eb);
220void free_extent_buffer_stale(struct extent_buffer *eb);
221#define WAIT_NONE	0
222#define WAIT_COMPLETE	1
223#define WAIT_PAGE_LOCK	2
224int read_extent_buffer_pages(struct extent_buffer *eb, int wait,
225			     int mirror_num);
226void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
 
 
 
227
228static inline int num_extent_pages(const struct extent_buffer *eb)
229{
230	return (round_up(eb->start + eb->len, PAGE_SIZE) >> PAGE_SHIFT) -
231	       (eb->start >> PAGE_SHIFT);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
232}
233
234static inline int extent_buffer_uptodate(const struct extent_buffer *eb)
235{
236	return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
237}
238
239int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
240			 unsigned long start, unsigned long len);
241void read_extent_buffer(const struct extent_buffer *eb, void *dst,
242			unsigned long start,
243			unsigned long len);
244int read_extent_buffer_to_user_nofault(const struct extent_buffer *eb,
245				       void __user *dst, unsigned long start,
246				       unsigned long len);
247void write_extent_buffer_fsid(const struct extent_buffer *eb, const void *src);
248void write_extent_buffer_chunk_tree_uuid(const struct extent_buffer *eb,
249		const void *src);
250void write_extent_buffer(const struct extent_buffer *eb, const void *src,
251			 unsigned long start, unsigned long len);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
252void copy_extent_buffer_full(const struct extent_buffer *dst,
253			     const struct extent_buffer *src);
254void copy_extent_buffer(const struct extent_buffer *dst,
255			const struct extent_buffer *src,
256			unsigned long dst_offset, unsigned long src_offset,
257			unsigned long len);
258void memcpy_extent_buffer(const struct extent_buffer *dst,
259			  unsigned long dst_offset, unsigned long src_offset,
260			  unsigned long len);
261void memmove_extent_buffer(const struct extent_buffer *dst,
262			   unsigned long dst_offset, unsigned long src_offset,
263			   unsigned long len);
264void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start,
265			   unsigned long len);
266int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start,
267			   unsigned long pos);
268void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start,
269			      unsigned long pos, unsigned long len);
270void extent_buffer_bitmap_clear(const struct extent_buffer *eb,
271				unsigned long start, unsigned long pos,
272				unsigned long len);
273void clear_extent_buffer_dirty(const struct extent_buffer *eb);
274bool set_extent_buffer_dirty(struct extent_buffer *eb);
275void set_extent_buffer_uptodate(struct extent_buffer *eb);
276void clear_extent_buffer_uptodate(struct extent_buffer *eb);
277int extent_buffer_under_io(const struct extent_buffer *eb);
278void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
279void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
280void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
281				  struct page *locked_page,
282				  unsigned bits_to_clear,
283				  unsigned long page_ops);
284struct bio *btrfs_bio_alloc(u64 first_byte);
285struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs);
286struct bio *btrfs_bio_clone(struct bio *bio);
287struct bio *btrfs_bio_clone_partial(struct bio *orig, int offset, int size);
288
289struct btrfs_fs_info;
290struct btrfs_inode;
291
292int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start,
293		      u64 length, u64 logical, struct page *page,
294		      unsigned int pg_offset, int mirror_num);
295void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
296int btrfs_repair_eb_io_failure(const struct extent_buffer *eb, int mirror_num);
297
298/*
299 * When IO fails, either with EIO or csum verification fails, we
300 * try other mirrors that might have a good copy of the data.  This
301 * io_failure_record is used to record state as we go through all the
302 * mirrors.  If another mirror has good data, the page is set up to date
303 * and things continue.  If a good mirror can't be found, the original
304 * bio end_io callback is called to indicate things have failed.
305 */
306struct io_failure_record {
307	struct page *page;
308	u64 start;
309	u64 len;
310	u64 logical;
311	unsigned long bio_flags;
312	int this_mirror;
313	int failed_mirror;
314	int in_validation;
315};
316
317
318blk_status_t btrfs_submit_read_repair(struct inode *inode,
319				      struct bio *failed_bio, u64 phy_offset,
320				      struct page *page, unsigned int pgoff,
321				      u64 start, u64 end, int failed_mirror,
322				      submit_bio_hook_t *submit_bio_hook);
323
324#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
325bool find_lock_delalloc_range(struct inode *inode,
326			     struct page *locked_page, u64 *start,
327			     u64 *end);
328#endif
329struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
330					       u64 start);
331
332#ifdef CONFIG_BTRFS_DEBUG
333void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info);
334#else
335#define btrfs_extent_buffer_leak_debug_check(fs_info)	do {} while (0)
336#endif
337
338#endif