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Chris Masond1310b22008-01-24 16:13:08 -05001#ifndef __EXTENTIO__
2#define __EXTENTIO__
3
4#include <linux/rbtree.h>
Qu Wenruoac467772015-10-12 12:08:16 +08005#include "ulist.h"
Chris Masond1310b22008-01-24 16:13:08 -05006
7/* bits for the extent state */
David Sterba9ee49a042015-01-14 19:52:13 +01008#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)
Qu Wenruo52472552015-10-12 16:05:40 +080022#define EXTENT_QGROUP_RESERVED (1U << 16)
David Sterba9ee49a042015-01-14 19:52:13 +010023#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
24#define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
Chris Masond1310b22008-01-24 16:13:08 -050025
Li Zefan261507a02010-12-17 14:21:50 +080026/*
27 * flags for bio submission. The high bits indicate the compression
28 * type for this bio
29 */
Chris Masonc8b97812008-10-29 14:49:59 -040030#define EXTENT_BIO_COMPRESSED 1
Josef Bacikde0022b2012-09-25 14:25:58 -040031#define EXTENT_BIO_TREE_LOG 2
Li Zefan261507a02010-12-17 14:21:50 +080032#define EXTENT_BIO_FLAG_SHIFT 16
Chris Masonc8b97812008-10-29 14:49:59 -040033
Chris Masonb4ce94d2009-02-04 09:25:08 -050034/* these are bit numbers for test/set bit */
35#define EXTENT_BUFFER_UPTODATE 0
Chris Masonb9473432009-03-13 11:00:37 -040036#define EXTENT_BUFFER_DIRTY 2
Josef Bacika826d6d2011-03-16 13:42:43 -040037#define EXTENT_BUFFER_CORRUPT 3
Arne Jansenab0fff02011-05-23 14:25:41 +020038#define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */
Josef Bacik3083ee22012-03-09 16:01:49 -050039#define EXTENT_BUFFER_TREE_REF 5
40#define EXTENT_BUFFER_STALE 6
Josef Bacik0b32f4b2012-03-13 09:38:00 -040041#define EXTENT_BUFFER_WRITEBACK 7
Filipe Manana656f30d2014-09-26 12:25:56 +010042#define EXTENT_BUFFER_READ_ERR 8 /* read IO error */
Jan Schmidt815a51c2012-05-16 17:00:02 +020043#define EXTENT_BUFFER_DUMMY 9
Josef Bacik34b41ac2013-12-13 10:41:51 -050044#define EXTENT_BUFFER_IN_TREE 10
Filipe Manana656f30d2014-09-26 12:25:56 +010045#define EXTENT_BUFFER_WRITE_ERR 11 /* write IO error */
Chris Masonb4ce94d2009-02-04 09:25:08 -050046
Chris Masona791e352009-10-08 11:27:10 -040047/* these are flags for extent_clear_unlock_delalloc */
Josef Bacikc2790a22013-07-29 11:20:47 -040048#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)
Filipe Manana704de492014-10-06 22:14:22 +010053#define PAGE_SET_ERROR (1 << 5)
Chris Masona791e352009-10-08 11:27:10 -040054
Chris Masond1310b22008-01-24 16:13:08 -050055/*
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
Chris Masond1310b22008-01-24 16:13:08 -050060
Chris Mason70dec802008-01-29 09:59:12 -050061struct extent_state;
Josef Bacikea466792012-03-26 21:57:36 -040062struct btrfs_root;
Miao Xiefacc8a222013-07-25 19:22:34 +080063struct btrfs_io_bio;
David Sterba47dc1962016-02-11 13:24:13 +010064struct io_failure_record;
Chris Mason70dec802008-01-29 09:59:12 -050065
Chris Mason44b8bd72008-04-16 11:14:51 -040066typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
Chris Masonc8b97812008-10-29 14:49:59 -040067 struct bio *bio, int mirror_num,
Chris Masoneaf25d92010-05-25 09:48:28 -040068 unsigned long bio_flags, u64 bio_offset);
Chris Masond1310b22008-01-24 16:13:08 -050069struct extent_io_ops {
Chris Masonc8b97812008-10-29 14:49:59 -040070 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
Chris Mason771ed682008-11-06 22:02:51 -050071 u64 start, u64 end, int *page_started,
72 unsigned long *nr_written);
Chris Mason247e7432008-07-17 12:53:51 -040073 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
Chris Masond1310b22008-01-24 16:13:08 -050074 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
Chris Mason44b8bd72008-04-16 11:14:51 -040075 extent_submit_bio_hook_t *submit_bio_hook;
David Woodhouse64a16702009-07-15 23:29:37 +010076 int (*merge_bio_hook)(int rw, struct page *page, unsigned long offset,
Chris Masonc8b97812008-10-29 14:49:59 -040077 size_t size, struct bio *bio,
78 unsigned long bio_flags);
Josef Bacikea466792012-03-26 21:57:36 -040079 int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
Miao Xiefacc8a222013-07-25 19:22:34 +080080 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);
Chris Mason1259ab72008-05-12 13:39:03 -040083 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
Chris Masone6dcd2d2008-07-17 12:53:50 -040084 struct extent_state *state, int uptodate);
Jeff Mahoney1bf85042011-07-21 16:56:09 +000085 void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
David Sterba9ee49a042015-01-14 19:52:13 +010086 unsigned *bits);
Jeff Mahoney1bf85042011-07-21 16:56:09 +000087 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
David Sterba9ee49a042015-01-14 19:52:13 +010088 unsigned *bits);
Jeff Mahoney1bf85042011-07-21 16:56:09 +000089 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);
Chris Masond1310b22008-01-24 16:13:08 -050094};
95
96struct extent_io_tree {
97 struct rb_root state;
98 struct address_space *mapping;
99 u64 dirty_bytes;
Josef Bacik0b32f4b2012-03-13 09:38:00 -0400100 int track_uptodate;
Chris Mason70dec802008-01-29 09:59:12 -0500101 spinlock_t lock;
David Sterbae8c9f182015-01-02 18:23:10 +0100102 const struct extent_io_ops *ops;
Chris Masond1310b22008-01-24 16:13:08 -0500103};
104
105struct extent_state {
106 u64 start;
107 u64 end; /* inclusive */
Chris Masond1310b22008-01-24 16:13:08 -0500108 struct rb_node rb_node;
Josef Bacik9ed74f22009-09-11 16:12:44 -0400109
110 /* ADD NEW ELEMENTS AFTER THIS */
Chris Masond1310b22008-01-24 16:13:08 -0500111 wait_queue_head_t wq;
112 atomic_t refs;
David Sterba9ee49a042015-01-14 19:52:13 +0100113 unsigned state;
Chris Masond1310b22008-01-24 16:13:08 -0500114
David Sterba47dc1962016-02-11 13:24:13 +0100115 struct io_failure_record *failrec;
Chris Masond1310b22008-01-24 16:13:08 -0500116
Eric Sandeen6d49ba12013-04-22 16:12:31 +0000117#ifdef CONFIG_BTRFS_DEBUG
Chris Mason2d2ae542008-03-26 16:24:23 -0400118 struct list_head leak_list;
Eric Sandeen6d49ba12013-04-22 16:12:31 +0000119#endif
Chris Masond1310b22008-01-24 16:13:08 -0500120};
121
Chris Mason727011e2010-08-06 13:21:20 -0400122#define INLINE_EXTENT_BUFFER_PAGES 16
123#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
Chris Masond1310b22008-01-24 16:13:08 -0500124struct extent_buffer {
125 u64 start;
126 unsigned long len;
Chris Masonb4ce94d2009-02-04 09:25:08 -0500127 unsigned long bflags;
Josef Bacikf28491e2013-12-16 13:24:27 -0500128 struct btrfs_fs_info *fs_info;
Josef Bacik3083ee22012-03-09 16:01:49 -0500129 spinlock_t refs_lock;
Chris Mason727011e2010-08-06 13:21:20 -0400130 atomic_t refs;
Josef Bacik0b32f4b2012-03-13 09:38:00 -0400131 atomic_t io_pages;
Josef Bacik5cf1ab52012-04-16 09:42:26 -0400132 int read_mirror;
Miao Xie19fe0a82010-10-26 20:57:29 -0400133 struct rcu_head rcu_head;
Arne Jansen5b25f702011-09-13 10:55:48 +0200134 pid_t lock_owner;
Chris Masonb4ce94d2009-02-04 09:25:08 -0500135
Chris Masonbd681512011-07-16 15:23:14 -0400136 /* 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;
Filipe Manana656f30d2014-09-26 12:25:56 +0100143 short lock_nested;
144 /* >= 0 if eb belongs to a log tree, -1 otherwise */
145 short log_index;
Chris Masonb4ce94d2009-02-04 09:25:08 -0500146
Chris Masonbd681512011-07-16 15:23:14 -0400147 /* protects write locks */
148 rwlock_t lock;
149
150 /* readers use lock_wq while they wait for the write
151 * lock holders to unlock
Chris Masonb4ce94d2009-02-04 09:25:08 -0500152 */
Chris Masonbd681512011-07-16 15:23:14 -0400153 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;
David Sterbab8dae312013-02-28 14:54:18 +0000159 struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
Eric Sandeen6d49ba12013-04-22 16:12:31 +0000160#ifdef CONFIG_BTRFS_DEBUG
161 struct list_head leak_list;
162#endif
Chris Masond1310b22008-01-24 16:13:08 -0500163};
164
Qu Wenruoac467772015-10-12 12:08:16 +0800165/*
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
Li Zefan261507a02010-12-17 14:21:50 +0800176static 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
Chris Masond1310b22008-01-24 16:13:08 -0500187struct extent_map_tree;
188
189typedef struct extent_map *(get_extent_t)(struct inode *inode,
190 struct page *page,
David Sterba306e16c2011-04-19 14:29:38 +0200191 size_t pg_offset,
Chris Masond1310b22008-01-24 16:13:08 -0500192 u64 start, u64 len,
193 int create);
194
195void extent_io_tree_init(struct extent_io_tree *tree,
David Sterbaf993c882011-04-20 23:35:57 +0200196 struct address_space *mapping);
Chris Masond1310b22008-01-24 16:13:08 -0500197int try_release_extent_mapping(struct extent_map_tree *map,
Chris Mason70dec802008-01-29 09:59:12 -0500198 struct extent_io_tree *tree, struct page *page,
199 gfp_t mask);
David Sterbaf7a52a42013-04-26 14:56:29 +0000200int try_release_extent_buffer(struct page *page);
Chris Mason1edbb732009-09-02 13:24:36 -0400201int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
David Sterbaff13db42015-12-03 14:30:40 +0100202 struct extent_state **cached);
David Sterbacd716d82015-12-03 14:41:30 +0100203
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
Jeff Mahoneyd0082372012-03-01 14:57:19 +0100209int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
Chris Masond1310b22008-01-24 16:13:08 -0500210int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
Jan Schmidt8ddc7d92011-06-13 20:02:58 +0200211 get_extent_t *get_extent, int mirror_num);
Chris Masond1310b22008-01-24 16:13:08 -0500212int __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,
David Sterba9ee49a042015-01-14 19:52:13 +0100217 u64 max_bytes, unsigned bits, int contig);
Chris Masond1310b22008-01-24 16:13:08 -0500218
Chris Mason4845e442010-05-25 20:56:50 -0400219void free_extent_state(struct extent_state *state);
Chris Masond1310b22008-01-24 16:13:08 -0500220int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
David Sterba9ee49a042015-01-14 19:52:13 +0100221 unsigned bits, int filled,
David Sterba41074882013-04-29 13:38:46 +0000222 struct extent_state *cached_state);
Qu Wenruofefdc552015-10-12 15:35:38 +0800223int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
224 unsigned bits, gfp_t mask,
225 struct extent_changeset *changeset);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400226int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
David Sterba9ee49a042015-01-14 19:52:13 +0100227 unsigned bits, int wake, int delete,
David Sterba41074882013-04-29 13:38:46 +0000228 struct extent_state **cached, gfp_t mask);
David Sterbac6317952015-12-03 14:08:11 +0100229
David Sterbae83b1d92015-12-03 14:08:11 +0100230static 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
Qu Wenruod38ed272015-10-12 14:53:37 +0800254int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
255 unsigned bits, gfp_t mask,
256 struct extent_changeset *changeset);
Chris Mason4845e442010-05-25 20:56:50 -0400257int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
David Sterba9ee49a042015-01-14 19:52:13 +0100258 unsigned bits, u64 *failed_start,
Chris Mason4845e442010-05-25 20:56:50 -0400259 struct extent_state **cached_state, gfp_t mask);
David Sterbac6317952015-12-03 14:08:11 +0100260
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
David Sterbae83b1d92015-12-03 14:08:11 +0100267static 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}
David Sterbac6317952015-12-03 14:08:11 +0100273
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
David Sterbae83b1d92015-12-03 14:08:11 +0100281static 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
Josef Bacik462d6fa2011-09-26 13:56:12 -0400289int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
David Sterba9ee49a042015-01-14 19:52:13 +0100290 unsigned bits, unsigned clear_bits,
Josef Bacike6138872012-09-27 17:07:30 -0400291 struct extent_state **cached_state, gfp_t mask);
David Sterbac6317952015-12-03 14:08:11 +0100292
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
Chris Masond1310b22008-01-24 16:13:08 -0500322int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
David Sterba9ee49a042015-01-14 19:52:13 +0100323 u64 *start_ret, u64 *end_ret, unsigned bits,
Josef Bacike6138872012-09-27 17:07:30 -0400324 struct extent_state **cached_state);
Chris Masond1310b22008-01-24 16:13:08 -0500325int 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);
Chris Mason771ed682008-11-06 22:02:51 -0500330int 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);
Chris Masond1310b22008-01-24 16:13:08 -0500333int extent_writepages(struct extent_io_tree *tree,
334 struct address_space *mapping,
335 get_extent_t *get_extent,
336 struct writeback_control *wbc);
Josef Bacik0b32f4b2012-03-13 09:38:00 -0400337int btree_write_cache_pages(struct address_space *mapping,
338 struct writeback_control *wbc);
Chris Masond1310b22008-01-24 16:13:08 -0500339int 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);
Yehuda Sadeh1506fcc2009-01-21 14:39:14 -0500343int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
344 __u64 start, __u64 len, get_extent_t *get_extent);
Chris Masond1310b22008-01-24 16:13:08 -0500345void set_page_extent_mapped(struct page *page);
346
Josef Bacikf28491e2013-12-16 13:24:27 -0500347struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
David Sterbace3e6982014-06-15 03:00:04 +0200348 u64 start);
Omar Sandoval0f331222015-09-29 20:50:31 -0700349struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
350 u64 start, unsigned long len);
David Sterba3f556f72014-06-15 03:20:26 +0200351struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
Omar Sandoval0f331222015-09-29 20:50:31 -0700352 u64 start);
Jan Schmidt815a51c2012-05-16 17:00:02 +0200353struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
Josef Bacikf28491e2013-12-16 13:24:27 -0500354struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
Chandra Seetharaman452c75c2013-10-07 10:45:25 -0500355 u64 start);
Chris Masond1310b22008-01-24 16:13:08 -0500356void free_extent_buffer(struct extent_buffer *eb);
Josef Bacik3083ee22012-03-09 16:01:49 -0500357void free_extent_buffer_stale(struct extent_buffer *eb);
Arne Jansenbb82ab82011-06-10 14:06:53 +0200358#define WAIT_NONE 0
359#define WAIT_COMPLETE 1
360#define WAIT_PAGE_LOCK 2
Chris Masond1310b22008-01-24 16:13:08 -0500361int read_extent_buffer_pages(struct extent_io_tree *tree,
Chris Masona86c12c2008-02-07 10:50:54 -0500362 struct extent_buffer *eb, u64 start, int wait,
Chris Masonf1885912008-04-09 16:28:12 -0400363 get_extent_t *get_extent, int mirror_num);
Josef Bacikfd8b2b62013-04-24 16:41:19 -0400364void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
Robin Dong479ed9a2012-09-29 02:07:47 -0600365
366static inline unsigned long num_extent_pages(u64 start, u64 len)
367{
368 return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
369 (start >> PAGE_CACHE_SHIFT);
370}
371
Chris Masond1310b22008-01-24 16:13:08 -0500372static 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);
Gerhard Heift550ac1d2014-01-30 16:24:01 +0100383int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst,
384 unsigned long start,
385 unsigned long len);
Chris Masond1310b22008-01-24 16:13:08 -0500386void 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);
Omar Sandoval3e1e8bb2015-09-29 20:50:30 -0700397int 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);
Chris Mason1d4284b2012-03-28 20:31:37 -0400403void clear_extent_buffer_dirty(struct extent_buffer *eb);
Josef Bacik0b32f4b2012-03-13 09:38:00 -0400404int set_extent_buffer_dirty(struct extent_buffer *eb);
David Sterba09c25a82015-12-03 13:08:59 +0100405void set_extent_buffer_uptodate(struct extent_buffer *eb);
David Sterba69ba3922015-12-03 13:08:59 +0100406void clear_extent_buffer_uptodate(struct extent_buffer *eb);
Josef Bacik0b32f4b2012-03-13 09:38:00 -0400407int extent_buffer_uptodate(struct extent_buffer *eb);
Josef Bacika26e8c92014-03-28 17:07:27 -0400408int extent_buffer_under_io(struct extent_buffer *eb);
Chris Masond1310b22008-01-24 16:13:08 -0500409int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
Chris Masona6591712011-07-19 12:04:14 -0400410 unsigned long min_len, char **map,
Chris Masond1310b22008-01-24 16:13:08 -0500411 unsigned long *map_start,
Chris Masona6591712011-07-19 12:04:14 -0400412 unsigned long *map_len);
David Sterbabd1fa4f2015-12-03 13:08:59 +0100413void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
David Sterbaf6311572015-12-03 13:08:59 +0100414void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
David Sterbaa9d93e12015-12-03 13:08:59 +0100415void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
Josef Bacikc2790a22013-07-29 11:20:47 -0400416 struct page *locked_page,
David Sterba9ee49a042015-01-14 19:52:13 +0100417 unsigned bits_to_clear,
Josef Bacikc2790a22013-07-29 11:20:47 -0400418 unsigned long page_ops);
Miao Xie88f794e2010-11-22 03:02:55 +0000419struct bio *
420btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
421 gfp_t gfp_flags);
Chris Mason9be33952013-05-17 18:30:14 -0400422struct 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);
Jan Schmidt4a54c8c2011-07-22 15:41:52 +0200424
Stefan Behrens3ec706c2012-11-05 15:46:42 +0100425struct btrfs_fs_info;
Jan Schmidt4a54c8c2011-07-22 15:41:52 +0200426
Miao Xie1203b682014-09-12 18:44:01 +0800427int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical,
428 struct page *page, unsigned int pg_offset,
429 int mirror_num);
Miao Xie8b110e32014-09-12 18:44:03 +0800430int clean_io_failure(struct inode *inode, u64 start, struct page *page,
431 unsigned int pg_offset);
David Sterbab5227c02015-12-03 13:08:59 +0100432void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
Josef Bacikea466792012-03-26 21:57:36 -0400433int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
434 int mirror_num);
Miao Xie2fe63032014-09-12 18:43:59 +0800435
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
Miao Xief6124962014-09-12 18:44:04 +0800455void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end);
Miao Xie2fe63032014-09-12 18:43:59 +0800456int 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,
Miao Xie8b110e32014-09-12 18:44:03 +0800463 bio_end_io_t *endio_func, void *data);
464int free_io_failure(struct inode *inode, struct io_failure_record *rec);
Josef Bacik294e30f2013-10-09 12:00:56 -0400465#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);
Chris Mason0d4cf4e2014-10-07 13:24:20 -0700470#endif
Josef Bacikfaa2dbf2014-05-07 17:06:09 -0400471struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
David Sterbace3e6982014-06-15 03:00:04 +0200472 u64 start);
Josef Bacik294e30f2013-10-09 12:00:56 -0400473#endif