tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef __EXTENTIO__
2#define __EXTENTIO__
3
4#include <linux/rbtree.h>
5
6/* bits for the extent state */
7#define EXTENT_DIRTY 1
8#define EXTENT_WRITEBACK (1 << 1)
9#define EXTENT_UPTODATE (1 << 2)
10#define EXTENT_LOCKED (1 << 3)
11#define EXTENT_NEW (1 << 4)
12#define EXTENT_DELALLOC (1 << 5)
13#define EXTENT_DEFRAG (1 << 6)
14#define EXTENT_DEFRAG_DONE (1 << 7)
15#define EXTENT_BUFFER_FILLED (1 << 8)
16#define EXTENT_BOUNDARY (1 << 9)
17#define EXTENT_NODATASUM (1 << 10)
18#define EXTENT_DO_ACCOUNTING (1 << 11)
19#define EXTENT_FIRST_DELALLOC (1 << 12)
20#define EXTENT_NEED_WAIT (1 << 13)
21#define EXTENT_DAMAGED (1 << 14)
22#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
23#define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
24
25/*
26 * flags for bio submission. The high bits indicate the compression
27 * type for this bio
28 */
29#define EXTENT_BIO_COMPRESSED 1
30#define EXTENT_BIO_TREE_LOG 2
31#define EXTENT_BIO_FLAG_SHIFT 16
32
33/* these are bit numbers for test/set bit */
34#define EXTENT_BUFFER_UPTODATE 0
35#define EXTENT_BUFFER_BLOCKING 1
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_IOERR 8
43#define EXTENT_BUFFER_DUMMY 9
44
45/* these are flags for extent_clear_unlock_delalloc */
46#define EXTENT_CLEAR_UNLOCK_PAGE 0x1
47#define EXTENT_CLEAR_UNLOCK 0x2
48#define EXTENT_CLEAR_DELALLOC 0x4
49#define EXTENT_CLEAR_DIRTY 0x8
50#define EXTENT_SET_WRITEBACK 0x10
51#define EXTENT_END_WRITEBACK 0x20
52#define EXTENT_SET_PRIVATE2 0x40
53#define EXTENT_CLEAR_ACCOUNTING 0x80
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#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
61
62struct extent_state;
63struct btrfs_root;
64
65typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
66 struct bio *bio, int mirror_num,
67 unsigned long bio_flags, u64 bio_offset);
68struct extent_io_ops {
69 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
70 u64 start, u64 end, int *page_started,
71 unsigned long *nr_written);
72 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
73 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
74 extent_submit_bio_hook_t *submit_bio_hook;
75 int (*merge_bio_hook)(int rw, struct page *page, unsigned long offset,
76 size_t size, struct bio *bio,
77 unsigned long bio_flags);
78 int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
79 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
80 struct extent_state *state, int mirror);
81 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
82 struct extent_state *state, int uptodate);
83 void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
84 int *bits);
85 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
86 int *bits);
87 void (*merge_extent_hook)(struct inode *inode,
88 struct extent_state *new,
89 struct extent_state *other);
90 void (*split_extent_hook)(struct inode *inode,
91 struct extent_state *orig, u64 split);
92};
93
94struct extent_io_tree {
95 struct rb_root state;
96 struct radix_tree_root buffer;
97 struct address_space *mapping;
98 u64 dirty_bytes;
99 int track_uptodate;
100 spinlock_t lock;
101 spinlock_t buffer_lock;
102 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 struct extent_io_tree *tree;
112 wait_queue_head_t wq;
113 atomic_t refs;
114 unsigned long state;
115
116 /* for use by the FS */
117 u64 private;
118
119 struct list_head leak_list;
120};
121
122#define INLINE_EXTENT_BUFFER_PAGES 16
123#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
124struct extent_buffer {
125 u64 start;
126 unsigned long len;
127 unsigned long map_start;
128 unsigned long map_len;
129 unsigned long bflags;
130 struct extent_io_tree *tree;
131 spinlock_t refs_lock;
132 atomic_t refs;
133 atomic_t io_pages;
134 int read_mirror;
135 struct list_head leak_list;
136 struct rcu_head rcu_head;
137 pid_t lock_owner;
138
139 /* count of read lock holders on the extent buffer */
140 atomic_t write_locks;
141 atomic_t read_locks;
142 atomic_t blocking_writers;
143 atomic_t blocking_readers;
144 atomic_t spinning_readers;
145 atomic_t spinning_writers;
146 int lock_nested;
147
148 /* protects write locks */
149 rwlock_t lock;
150
151 /* readers use lock_wq while they wait for the write
152 * lock holders to unlock
153 */
154 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;
160 wait_queue_head_t lock_wq;
161 struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
162};
163
164static inline void extent_set_compress_type(unsigned long *bio_flags,
165 int compress_type)
166{
167 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
168}
169
170static inline int extent_compress_type(unsigned long bio_flags)
171{
172 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
173}
174
175struct extent_map_tree;
176
177typedef struct extent_map *(get_extent_t)(struct inode *inode,
178 struct page *page,
179 size_t pg_offset,
180 u64 start, u64 len,
181 int create);
182
183void extent_io_tree_init(struct extent_io_tree *tree,
184 struct address_space *mapping);
185int try_release_extent_mapping(struct extent_map_tree *map,
186 struct extent_io_tree *tree, struct page *page,
187 gfp_t mask);
188int try_release_extent_buffer(struct page *page, gfp_t mask);
189int try_release_extent_state(struct extent_map_tree *map,
190 struct extent_io_tree *tree, struct page *page,
191 gfp_t mask);
192int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
193int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
194 int bits, struct extent_state **cached);
195int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
196int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
197 struct extent_state **cached, gfp_t mask);
198int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
199int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
200 get_extent_t *get_extent, int mirror_num);
201int __init extent_io_init(void);
202void extent_io_exit(void);
203
204u64 count_range_bits(struct extent_io_tree *tree,
205 u64 *start, u64 search_end,
206 u64 max_bytes, unsigned long bits, int contig);
207
208void free_extent_state(struct extent_state *state);
209int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
210 int bits, int filled, struct extent_state *cached_state);
211int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
212 int bits, gfp_t mask);
213int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
214 int bits, int wake, int delete, struct extent_state **cached,
215 gfp_t mask);
216int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
217 int bits, gfp_t mask);
218int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
219 int bits, u64 *failed_start,
220 struct extent_state **cached_state, gfp_t mask);
221int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
222 struct extent_state **cached_state, gfp_t mask);
223int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
224 struct extent_state **cached_state, gfp_t mask);
225int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
226 gfp_t mask);
227int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
228 gfp_t mask);
229int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
230 gfp_t mask);
231int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
232 int bits, int clear_bits,
233 struct extent_state **cached_state, gfp_t mask);
234int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
235 struct extent_state **cached_state, gfp_t mask);
236int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
237 struct extent_state **cached_state, gfp_t mask);
238int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
239 u64 *start_ret, u64 *end_ret, int bits,
240 struct extent_state **cached_state);
241struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
242 u64 start, int bits);
243int extent_invalidatepage(struct extent_io_tree *tree,
244 struct page *page, unsigned long offset);
245int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
246 get_extent_t *get_extent,
247 struct writeback_control *wbc);
248int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
249 u64 start, u64 end, get_extent_t *get_extent,
250 int mode);
251int extent_writepages(struct extent_io_tree *tree,
252 struct address_space *mapping,
253 get_extent_t *get_extent,
254 struct writeback_control *wbc);
255int btree_write_cache_pages(struct address_space *mapping,
256 struct writeback_control *wbc);
257int extent_readpages(struct extent_io_tree *tree,
258 struct address_space *mapping,
259 struct list_head *pages, unsigned nr_pages,
260 get_extent_t get_extent);
261int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
262 __u64 start, __u64 len, get_extent_t *get_extent);
263int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
264int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
265void set_page_extent_mapped(struct page *page);
266
267struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
268 u64 start, unsigned long len);
269struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
270struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
271struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
272 u64 start, unsigned long len);
273void free_extent_buffer(struct extent_buffer *eb);
274void free_extent_buffer_stale(struct extent_buffer *eb);
275#define WAIT_NONE 0
276#define WAIT_COMPLETE 1
277#define WAIT_PAGE_LOCK 2
278int read_extent_buffer_pages(struct extent_io_tree *tree,
279 struct extent_buffer *eb, u64 start, int wait,
280 get_extent_t *get_extent, int mirror_num);
281
282static inline unsigned long num_extent_pages(u64 start, u64 len)
283{
284 return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
285 (start >> PAGE_CACHE_SHIFT);
286}
287
288static inline struct page *extent_buffer_page(struct extent_buffer *eb,
289 unsigned long i)
290{
291 return eb->pages[i];
292}
293
294static inline void extent_buffer_get(struct extent_buffer *eb)
295{
296 atomic_inc(&eb->refs);
297}
298
299int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
300 unsigned long start,
301 unsigned long len);
302void read_extent_buffer(struct extent_buffer *eb, void *dst,
303 unsigned long start,
304 unsigned long len);
305void write_extent_buffer(struct extent_buffer *eb, const void *src,
306 unsigned long start, unsigned long len);
307void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
308 unsigned long dst_offset, unsigned long src_offset,
309 unsigned long len);
310void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
311 unsigned long src_offset, unsigned long len);
312void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
313 unsigned long src_offset, unsigned long len);
314void memset_extent_buffer(struct extent_buffer *eb, char c,
315 unsigned long start, unsigned long len);
316void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
317void clear_extent_buffer_dirty(struct extent_buffer *eb);
318int set_extent_buffer_dirty(struct extent_buffer *eb);
319int set_extent_buffer_uptodate(struct extent_buffer *eb);
320int clear_extent_buffer_uptodate(struct extent_buffer *eb);
321int extent_buffer_uptodate(struct extent_buffer *eb);
322int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
323 unsigned long min_len, char **map,
324 unsigned long *map_start,
325 unsigned long *map_len);
326int extent_range_uptodate(struct extent_io_tree *tree,
327 u64 start, u64 end);
328int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
329int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
330int extent_clear_unlock_delalloc(struct inode *inode,
331 struct extent_io_tree *tree,
332 u64 start, u64 end, struct page *locked_page,
333 unsigned long op);
334struct bio *
335btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
336 gfp_t gfp_flags);
337
338struct btrfs_fs_info;
339
340int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start,
341 u64 length, u64 logical, struct page *page,
342 int mirror_num);
343int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
344int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
345 int mirror_num);
346#endif