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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
Mark Fasheh4b384312013-08-06 11:42:50 -070032#define EXTENT_BIO_PARENT_LOCKED 4
Li Zefan261507a02010-12-17 14:21:50 +080033#define EXTENT_BIO_FLAG_SHIFT 16
Chris Masonc8b97812008-10-29 14:49:59 -040034
Chris Masonb4ce94d2009-02-04 09:25:08 -050035/* these are bit numbers for test/set bit */
36#define EXTENT_BUFFER_UPTODATE 0
Chris Masonb9473432009-03-13 11:00:37 -040037#define EXTENT_BUFFER_DIRTY 2
Josef Bacika826d6d2011-03-16 13:42:43 -040038#define EXTENT_BUFFER_CORRUPT 3
Arne Jansenab0fff02011-05-23 14:25:41 +020039#define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */
Josef Bacik3083ee22012-03-09 16:01:49 -050040#define EXTENT_BUFFER_TREE_REF 5
41#define EXTENT_BUFFER_STALE 6
Josef Bacik0b32f4b2012-03-13 09:38:00 -040042#define EXTENT_BUFFER_WRITEBACK 7
Filipe Manana656f30d2014-09-26 12:25:56 +010043#define EXTENT_BUFFER_READ_ERR 8 /* read IO error */
Jan Schmidt815a51c2012-05-16 17:00:02 +020044#define EXTENT_BUFFER_DUMMY 9
Josef Bacik34b41ac2013-12-13 10:41:51 -050045#define EXTENT_BUFFER_IN_TREE 10
Filipe Manana656f30d2014-09-26 12:25:56 +010046#define EXTENT_BUFFER_WRITE_ERR 11 /* write IO error */
Chris Masonb4ce94d2009-02-04 09:25:08 -050047
Chris Masona791e352009-10-08 11:27:10 -040048/* these are flags for extent_clear_unlock_delalloc */
Josef Bacikc2790a22013-07-29 11:20:47 -040049#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)
Filipe Manana704de492014-10-06 22:14:22 +010054#define PAGE_SET_ERROR (1 << 5)
Chris Masona791e352009-10-08 11:27:10 -040055
Chris Masond1310b22008-01-24 16:13:08 -050056/*
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
Chris Masond1310b22008-01-24 16:13:08 -050061
Chris Mason70dec802008-01-29 09:59:12 -050062struct extent_state;
Josef Bacikea466792012-03-26 21:57:36 -040063struct btrfs_root;
Miao Xiefacc8a222013-07-25 19:22:34 +080064struct btrfs_io_bio;
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
115 /* for use by the FS */
116 u64 private;
117
Eric Sandeen6d49ba12013-04-22 16:12:31 +0000118#ifdef CONFIG_BTRFS_DEBUG
Chris Mason2d2ae542008-03-26 16:24:23 -0400119 struct list_head leak_list;
Eric Sandeen6d49ba12013-04-22 16:12:31 +0000120#endif
Chris Masond1310b22008-01-24 16:13:08 -0500121};
122
Chris Mason727011e2010-08-06 13:21:20 -0400123#define INLINE_EXTENT_BUFFER_PAGES 16
124#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
Chris Masond1310b22008-01-24 16:13:08 -0500125struct extent_buffer {
126 u64 start;
127 unsigned long len;
Chris Masonb4ce94d2009-02-04 09:25:08 -0500128 unsigned long bflags;
Josef Bacikf28491e2013-12-16 13:24:27 -0500129 struct btrfs_fs_info *fs_info;
Josef Bacik3083ee22012-03-09 16:01:49 -0500130 spinlock_t refs_lock;
Chris Mason727011e2010-08-06 13:21:20 -0400131 atomic_t refs;
Josef Bacik0b32f4b2012-03-13 09:38:00 -0400132 atomic_t io_pages;
Josef Bacik5cf1ab52012-04-16 09:42:26 -0400133 int read_mirror;
Miao Xie19fe0a82010-10-26 20:57:29 -0400134 struct rcu_head rcu_head;
Arne Jansen5b25f702011-09-13 10:55:48 +0200135 pid_t lock_owner;
Chris Masonb4ce94d2009-02-04 09:25:08 -0500136
Chris Masonbd681512011-07-16 15:23:14 -0400137 /* count of read lock holders on the extent buffer */
138 atomic_t write_locks;
139 atomic_t read_locks;
140 atomic_t blocking_writers;
141 atomic_t blocking_readers;
142 atomic_t spinning_readers;
143 atomic_t spinning_writers;
Filipe Manana656f30d2014-09-26 12:25:56 +0100144 short lock_nested;
145 /* >= 0 if eb belongs to a log tree, -1 otherwise */
146 short log_index;
Chris Masonb4ce94d2009-02-04 09:25:08 -0500147
Chris Masonbd681512011-07-16 15:23:14 -0400148 /* protects write locks */
149 rwlock_t lock;
150
151 /* readers use lock_wq while they wait for the write
152 * lock holders to unlock
Chris Masonb4ce94d2009-02-04 09:25:08 -0500153 */
Chris Masonbd681512011-07-16 15:23:14 -0400154 wait_queue_head_t write_lock_wq;
155
156 /* writers use read_lock_wq while they wait for readers
157 * to unlock
158 */
159 wait_queue_head_t read_lock_wq;
David Sterbab8dae312013-02-28 14:54:18 +0000160 struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
Eric Sandeen6d49ba12013-04-22 16:12:31 +0000161#ifdef CONFIG_BTRFS_DEBUG
162 struct list_head leak_list;
163#endif
Chris Masond1310b22008-01-24 16:13:08 -0500164};
165
Qu Wenruoac467772015-10-12 12:08:16 +0800166/*
167 * Structure to record how many bytes and which ranges are set/cleared
168 */
169struct extent_changeset {
170 /* How many bytes are set/cleared in this operation */
171 u64 bytes_changed;
172
173 /* Changed ranges */
174 struct ulist *range_changed;
175};
176
Li Zefan261507a02010-12-17 14:21:50 +0800177static inline void extent_set_compress_type(unsigned long *bio_flags,
178 int compress_type)
179{
180 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
181}
182
183static inline int extent_compress_type(unsigned long bio_flags)
184{
185 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
186}
187
Chris Masond1310b22008-01-24 16:13:08 -0500188struct extent_map_tree;
189
190typedef struct extent_map *(get_extent_t)(struct inode *inode,
191 struct page *page,
David Sterba306e16c2011-04-19 14:29:38 +0200192 size_t pg_offset,
Chris Masond1310b22008-01-24 16:13:08 -0500193 u64 start, u64 len,
194 int create);
195
196void extent_io_tree_init(struct extent_io_tree *tree,
David Sterbaf993c882011-04-20 23:35:57 +0200197 struct address_space *mapping);
Chris Masond1310b22008-01-24 16:13:08 -0500198int try_release_extent_mapping(struct extent_map_tree *map,
Chris Mason70dec802008-01-29 09:59:12 -0500199 struct extent_io_tree *tree, struct page *page,
200 gfp_t mask);
David Sterbaf7a52a42013-04-26 14:56:29 +0000201int try_release_extent_buffer(struct page *page);
Jeff Mahoneyd0082372012-03-01 14:57:19 +0100202int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
Chris Mason1edbb732009-09-02 13:24:36 -0400203int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
David Sterba9ee49a042015-01-14 19:52:13 +0100204 unsigned bits, struct extent_state **cached);
Jeff Mahoneyd0082372012-03-01 14:57:19 +0100205int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
Josef Bacik2ac55d42010-02-03 19:33:23 +0000206int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
207 struct extent_state **cached, gfp_t mask);
Jeff Mahoneyd0082372012-03-01 14:57:19 +0100208int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
Chris Masond1310b22008-01-24 16:13:08 -0500209int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
Jan Schmidt8ddc7d92011-06-13 20:02:58 +0200210 get_extent_t *get_extent, int mirror_num);
Mark Fasheh4b384312013-08-06 11:42:50 -0700211int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page,
212 get_extent_t *get_extent, int mirror_num);
Chris Masond1310b22008-01-24 16:13:08 -0500213int __init extent_io_init(void);
214void extent_io_exit(void);
215
216u64 count_range_bits(struct extent_io_tree *tree,
217 u64 *start, u64 search_end,
David Sterba9ee49a042015-01-14 19:52:13 +0100218 u64 max_bytes, unsigned bits, int contig);
Chris Masond1310b22008-01-24 16:13:08 -0500219
Chris Mason4845e442010-05-25 20:56:50 -0400220void free_extent_state(struct extent_state *state);
Chris Masond1310b22008-01-24 16:13:08 -0500221int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
David Sterba9ee49a042015-01-14 19:52:13 +0100222 unsigned bits, int filled,
David Sterba41074882013-04-29 13:38:46 +0000223 struct extent_state *cached_state);
Chris Masond1310b22008-01-24 16:13:08 -0500224int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
David Sterba9ee49a042015-01-14 19:52:13 +0100225 unsigned bits, gfp_t mask);
Qu Wenruofefdc552015-10-12 15:35:38 +0800226int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
227 unsigned bits, gfp_t mask,
228 struct extent_changeset *changeset);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400229int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
David Sterba9ee49a042015-01-14 19:52:13 +0100230 unsigned bits, int wake, int delete,
David Sterba41074882013-04-29 13:38:46 +0000231 struct extent_state **cached, gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500232int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
David Sterba9ee49a042015-01-14 19:52:13 +0100233 unsigned bits, gfp_t mask);
Qu Wenruod38ed272015-10-12 14:53:37 +0800234int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
235 unsigned bits, gfp_t mask,
236 struct extent_changeset *changeset);
Chris Mason4845e442010-05-25 20:56:50 -0400237int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
David Sterba9ee49a042015-01-14 19:52:13 +0100238 unsigned bits, u64 *failed_start,
Chris Mason4845e442010-05-25 20:56:50 -0400239 struct extent_state **cached_state, gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500240int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
Arne Jansen507903b2011-04-06 10:02:20 +0000241 struct extent_state **cached_state, gfp_t mask);
Josef Bacik5fd02042012-05-02 14:00:54 -0400242int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
243 struct extent_state **cached_state, gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500244int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
245 gfp_t mask);
246int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
247 gfp_t mask);
248int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
249 gfp_t mask);
Josef Bacik462d6fa2011-09-26 13:56:12 -0400250int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
David Sterba9ee49a042015-01-14 19:52:13 +0100251 unsigned bits, unsigned clear_bits,
Josef Bacike6138872012-09-27 17:07:30 -0400252 struct extent_state **cached_state, gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500253int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
Josef Bacik2ac55d42010-02-03 19:33:23 +0000254 struct extent_state **cached_state, gfp_t mask);
Liu Bo9e8a4a82012-09-05 19:10:51 -0600255int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
256 struct extent_state **cached_state, gfp_t mask);
Chris Masond1310b22008-01-24 16:13:08 -0500257int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
David Sterba9ee49a042015-01-14 19:52:13 +0100258 u64 *start_ret, u64 *end_ret, unsigned bits,
Josef Bacike6138872012-09-27 17:07:30 -0400259 struct extent_state **cached_state);
Chris Masond1310b22008-01-24 16:13:08 -0500260int extent_invalidatepage(struct extent_io_tree *tree,
261 struct page *page, unsigned long offset);
262int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
263 get_extent_t *get_extent,
264 struct writeback_control *wbc);
Chris Mason771ed682008-11-06 22:02:51 -0500265int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
266 u64 start, u64 end, get_extent_t *get_extent,
267 int mode);
Chris Masond1310b22008-01-24 16:13:08 -0500268int extent_writepages(struct extent_io_tree *tree,
269 struct address_space *mapping,
270 get_extent_t *get_extent,
271 struct writeback_control *wbc);
Josef Bacik0b32f4b2012-03-13 09:38:00 -0400272int btree_write_cache_pages(struct address_space *mapping,
273 struct writeback_control *wbc);
Chris Masond1310b22008-01-24 16:13:08 -0500274int extent_readpages(struct extent_io_tree *tree,
275 struct address_space *mapping,
276 struct list_head *pages, unsigned nr_pages,
277 get_extent_t get_extent);
Yehuda Sadeh1506fcc2009-01-21 14:39:14 -0500278int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
279 __u64 start, __u64 len, get_extent_t *get_extent);
Chris Masond1310b22008-01-24 16:13:08 -0500280int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
281void set_page_extent_mapped(struct page *page);
282
Josef Bacikf28491e2013-12-16 13:24:27 -0500283struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
David Sterbace3e6982014-06-15 03:00:04 +0200284 u64 start);
David Sterba3f556f72014-06-15 03:20:26 +0200285struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
286 u64 start);
Jan Schmidt815a51c2012-05-16 17:00:02 +0200287struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
Josef Bacikf28491e2013-12-16 13:24:27 -0500288struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
Chandra Seetharaman452c75c2013-10-07 10:45:25 -0500289 u64 start);
Chris Masond1310b22008-01-24 16:13:08 -0500290void free_extent_buffer(struct extent_buffer *eb);
Josef Bacik3083ee22012-03-09 16:01:49 -0500291void free_extent_buffer_stale(struct extent_buffer *eb);
Arne Jansenbb82ab82011-06-10 14:06:53 +0200292#define WAIT_NONE 0
293#define WAIT_COMPLETE 1
294#define WAIT_PAGE_LOCK 2
Chris Masond1310b22008-01-24 16:13:08 -0500295int read_extent_buffer_pages(struct extent_io_tree *tree,
Chris Masona86c12c2008-02-07 10:50:54 -0500296 struct extent_buffer *eb, u64 start, int wait,
Chris Masonf1885912008-04-09 16:28:12 -0400297 get_extent_t *get_extent, int mirror_num);
Josef Bacikfd8b2b62013-04-24 16:41:19 -0400298void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
Robin Dong479ed9a2012-09-29 02:07:47 -0600299
300static inline unsigned long num_extent_pages(u64 start, u64 len)
301{
302 return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
303 (start >> PAGE_CACHE_SHIFT);
304}
305
Chris Masond1310b22008-01-24 16:13:08 -0500306static inline void extent_buffer_get(struct extent_buffer *eb)
307{
308 atomic_inc(&eb->refs);
309}
310
311int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
312 unsigned long start,
313 unsigned long len);
314void read_extent_buffer(struct extent_buffer *eb, void *dst,
315 unsigned long start,
316 unsigned long len);
Gerhard Heift550ac1d2014-01-30 16:24:01 +0100317int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst,
318 unsigned long start,
319 unsigned long len);
Chris Masond1310b22008-01-24 16:13:08 -0500320void write_extent_buffer(struct extent_buffer *eb, const void *src,
321 unsigned long start, unsigned long len);
322void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
323 unsigned long dst_offset, unsigned long src_offset,
324 unsigned long len);
325void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
326 unsigned long src_offset, unsigned long len);
327void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
328 unsigned long src_offset, unsigned long len);
329void memset_extent_buffer(struct extent_buffer *eb, char c,
330 unsigned long start, unsigned long len);
Chris Mason1d4284b2012-03-28 20:31:37 -0400331void clear_extent_buffer_dirty(struct extent_buffer *eb);
Josef Bacik0b32f4b2012-03-13 09:38:00 -0400332int set_extent_buffer_dirty(struct extent_buffer *eb);
333int set_extent_buffer_uptodate(struct extent_buffer *eb);
334int clear_extent_buffer_uptodate(struct extent_buffer *eb);
335int extent_buffer_uptodate(struct extent_buffer *eb);
Josef Bacika26e8c92014-03-28 17:07:27 -0400336int extent_buffer_under_io(struct extent_buffer *eb);
Chris Masond1310b22008-01-24 16:13:08 -0500337int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
Chris Masona6591712011-07-19 12:04:14 -0400338 unsigned long min_len, char **map,
Chris Masond1310b22008-01-24 16:13:08 -0500339 unsigned long *map_start,
Chris Masona6591712011-07-19 12:04:14 -0400340 unsigned long *map_len);
Chris Mason4adaa612013-03-26 13:07:00 -0400341int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
342int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
Josef Bacikc2790a22013-07-29 11:20:47 -0400343int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
344 struct page *locked_page,
David Sterba9ee49a042015-01-14 19:52:13 +0100345 unsigned bits_to_clear,
Josef Bacikc2790a22013-07-29 11:20:47 -0400346 unsigned long page_ops);
Miao Xie88f794e2010-11-22 03:02:55 +0000347struct bio *
348btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
349 gfp_t gfp_flags);
Chris Mason9be33952013-05-17 18:30:14 -0400350struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
351struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
Jan Schmidt4a54c8c2011-07-22 15:41:52 +0200352
Stefan Behrens3ec706c2012-11-05 15:46:42 +0100353struct btrfs_fs_info;
Jan Schmidt4a54c8c2011-07-22 15:41:52 +0200354
Miao Xie1203b682014-09-12 18:44:01 +0800355int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical,
356 struct page *page, unsigned int pg_offset,
357 int mirror_num);
Miao Xie8b110e32014-09-12 18:44:03 +0800358int clean_io_failure(struct inode *inode, u64 start, struct page *page,
359 unsigned int pg_offset);
Jeff Mahoney87826df2012-02-15 16:23:57 +0100360int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
Josef Bacikea466792012-03-26 21:57:36 -0400361int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
362 int mirror_num);
Miao Xie2fe63032014-09-12 18:43:59 +0800363
364/*
365 * When IO fails, either with EIO or csum verification fails, we
366 * try other mirrors that might have a good copy of the data. This
367 * io_failure_record is used to record state as we go through all the
368 * mirrors. If another mirror has good data, the page is set up to date
369 * and things continue. If a good mirror can't be found, the original
370 * bio end_io callback is called to indicate things have failed.
371 */
372struct io_failure_record {
373 struct page *page;
374 u64 start;
375 u64 len;
376 u64 logical;
377 unsigned long bio_flags;
378 int this_mirror;
379 int failed_mirror;
380 int in_validation;
381};
382
Miao Xief6124962014-09-12 18:44:04 +0800383void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end);
Miao Xie2fe63032014-09-12 18:43:59 +0800384int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
385 struct io_failure_record **failrec_ret);
386int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio,
387 struct io_failure_record *failrec, int fail_mirror);
388struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
389 struct io_failure_record *failrec,
390 struct page *page, int pg_offset, int icsum,
Miao Xie8b110e32014-09-12 18:44:03 +0800391 bio_end_io_t *endio_func, void *data);
392int free_io_failure(struct inode *inode, struct io_failure_record *rec);
Josef Bacik294e30f2013-10-09 12:00:56 -0400393#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
394noinline u64 find_lock_delalloc_range(struct inode *inode,
395 struct extent_io_tree *tree,
396 struct page *locked_page, u64 *start,
397 u64 *end, u64 max_bytes);
Chris Mason0d4cf4e2014-10-07 13:24:20 -0700398#endif
Josef Bacikfaa2dbf2014-05-07 17:06:09 -0400399struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
David Sterbace3e6982014-06-15 03:00:04 +0200400 u64 start);
Josef Bacik294e30f2013-10-09 12:00:56 -0400401#endif