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)(struct page *page, unsigned long offset,
76 size_t size, struct bio *bio,
77 unsigned long bio_flags);
78 int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
79 int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
80 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
81 struct extent_state *state, int mirror);
82 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
83 struct extent_state *state, int uptodate);
84 void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
85 int *bits);
86 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
87 int *bits);
88 void (*merge_extent_hook)(struct inode *inode,
89 struct extent_state *new,
90 struct extent_state *other);
91 void (*split_extent_hook)(struct inode *inode,
92 struct extent_state *orig, u64 split);
93 int (*write_cache_pages_lock_hook)(struct page *page, void *data,
94 void (*flush_fn)(void *));
95};
96
97struct extent_io_tree {
98 struct rb_root state;
99 struct radix_tree_root buffer;
100 struct address_space *mapping;
101 u64 dirty_bytes;
102 int track_uptodate;
103 spinlock_t lock;
104 spinlock_t buffer_lock;
105 struct extent_io_ops *ops;
106};
107
108struct extent_state {
109 u64 start;
110 u64 end; /* inclusive */
111 struct rb_node rb_node;
112
113 /* ADD NEW ELEMENTS AFTER THIS */
114 struct extent_io_tree *tree;
115 wait_queue_head_t wq;
116 atomic_t refs;
117 unsigned long state;
118
119 /* for use by the FS */
120 u64 private;
121
122 struct list_head leak_list;
123};
124
125#define INLINE_EXTENT_BUFFER_PAGES 16
126#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
127struct extent_buffer {
128 u64 start;
129 unsigned long len;
130 unsigned long map_start;
131 unsigned long map_len;
132 unsigned long bflags;
133 struct extent_io_tree *tree;
134 spinlock_t refs_lock;
135 atomic_t refs;
136 atomic_t io_pages;
137 int read_mirror;
138 struct list_head leak_list;
139 struct rcu_head rcu_head;
140 pid_t lock_owner;
141
142 /* count of read lock holders on the extent buffer */
143 atomic_t write_locks;
144 atomic_t read_locks;
145 atomic_t blocking_writers;
146 atomic_t blocking_readers;
147 atomic_t spinning_readers;
148 atomic_t spinning_writers;
149 int lock_nested;
150
151 /* protects write locks */
152 rwlock_t lock;
153
154 /* readers use lock_wq while they wait for the write
155 * lock holders to unlock
156 */
157 wait_queue_head_t write_lock_wq;
158
159 /* writers use read_lock_wq while they wait for readers
160 * to unlock
161 */
162 wait_queue_head_t read_lock_wq;
163 wait_queue_head_t lock_wq;
164 struct page *inline_pages[INLINE_EXTENT_BUFFER_PAGES];
165 struct page **pages;
166};
167
168static inline void extent_set_compress_type(unsigned long *bio_flags,
169 int compress_type)
170{
171 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
172}
173
174static inline int extent_compress_type(unsigned long bio_flags)
175{
176 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
177}
178
179struct extent_map_tree;
180
181typedef struct extent_map *(get_extent_t)(struct inode *inode,
182 struct page *page,
183 size_t pg_offset,
184 u64 start, u64 len,
185 int create);
186
187void extent_io_tree_init(struct extent_io_tree *tree,
188 struct address_space *mapping);
189int try_release_extent_mapping(struct extent_map_tree *map,
190 struct extent_io_tree *tree, struct page *page,
191 gfp_t mask);
192int try_release_extent_buffer(struct page *page, gfp_t mask);
193int try_release_extent_state(struct extent_map_tree *map,
194 struct extent_io_tree *tree, struct page *page,
195 gfp_t mask);
196int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
197int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
198 int bits, struct extent_state **cached);
199int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
200int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
201 struct extent_state **cached, gfp_t mask);
202int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
203int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
204 get_extent_t *get_extent, int mirror_num);
205int __init extent_io_init(void);
206void extent_io_exit(void);
207
208u64 count_range_bits(struct extent_io_tree *tree,
209 u64 *start, u64 search_end,
210 u64 max_bytes, unsigned long bits, int contig);
211
212void free_extent_state(struct extent_state *state);
213int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
214 int bits, int filled, struct extent_state *cached_state);
215int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
216 int bits, gfp_t mask);
217int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
218 int bits, int wake, int delete, struct extent_state **cached,
219 gfp_t mask);
220int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
221 int bits, gfp_t mask);
222int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
223 int bits, u64 *failed_start,
224 struct extent_state **cached_state, gfp_t mask);
225int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
226 struct extent_state **cached_state, gfp_t mask);
227int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
228 struct extent_state **cached_state, gfp_t mask);
229int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
230 gfp_t mask);
231int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
232 gfp_t mask);
233int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
234 gfp_t mask);
235int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
236 int bits, int clear_bits,
237 struct extent_state **cached_state, gfp_t mask);
238int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
239 struct extent_state **cached_state, gfp_t mask);
240int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
241 struct extent_state **cached_state, gfp_t mask);
242int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
243 u64 *start_ret, u64 *end_ret, int bits,
244 struct extent_state **cached_state);
245struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
246 u64 start, int bits);
247int extent_invalidatepage(struct extent_io_tree *tree,
248 struct page *page, unsigned long offset);
249int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
250 get_extent_t *get_extent,
251 struct writeback_control *wbc);
252int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
253 u64 start, u64 end, get_extent_t *get_extent,
254 int mode);
255int extent_writepages(struct extent_io_tree *tree,
256 struct address_space *mapping,
257 get_extent_t *get_extent,
258 struct writeback_control *wbc);
259int btree_write_cache_pages(struct address_space *mapping,
260 struct writeback_control *wbc);
261int extent_readpages(struct extent_io_tree *tree,
262 struct address_space *mapping,
263 struct list_head *pages, unsigned nr_pages,
264 get_extent_t get_extent);
265int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
266 __u64 start, __u64 len, get_extent_t *get_extent);
267int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
268int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
269void set_page_extent_mapped(struct page *page);
270
271struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
272 u64 start, unsigned long len);
273struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
274struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
275struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
276 u64 start, unsigned long len);
277void free_extent_buffer(struct extent_buffer *eb);
278void free_extent_buffer_stale(struct extent_buffer *eb);
279#define WAIT_NONE 0
280#define WAIT_COMPLETE 1
281#define WAIT_PAGE_LOCK 2
282int read_extent_buffer_pages(struct extent_io_tree *tree,
283 struct extent_buffer *eb, u64 start, int wait,
284 get_extent_t *get_extent, int mirror_num);
285
286static inline unsigned long num_extent_pages(u64 start, u64 len)
287{
288 return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
289 (start >> PAGE_CACHE_SHIFT);
290}
291
292static inline struct page *extent_buffer_page(struct extent_buffer *eb,
293 unsigned long i)
294{
295 return eb->pages[i];
296}
297
298static inline void extent_buffer_get(struct extent_buffer *eb)
299{
300 atomic_inc(&eb->refs);
301}
302
303int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
304 unsigned long start,
305 unsigned long len);
306void read_extent_buffer(struct extent_buffer *eb, void *dst,
307 unsigned long start,
308 unsigned long len);
309void write_extent_buffer(struct extent_buffer *eb, const void *src,
310 unsigned long start, unsigned long len);
311void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
312 unsigned long dst_offset, unsigned long src_offset,
313 unsigned long len);
314void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
315 unsigned long src_offset, unsigned long len);
316void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
317 unsigned long src_offset, unsigned long len);
318void memset_extent_buffer(struct extent_buffer *eb, char c,
319 unsigned long start, unsigned long len);
320void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
321void clear_extent_buffer_dirty(struct extent_buffer *eb);
322int set_extent_buffer_dirty(struct extent_buffer *eb);
323int set_extent_buffer_uptodate(struct extent_buffer *eb);
324int clear_extent_buffer_uptodate(struct extent_buffer *eb);
325int extent_buffer_uptodate(struct extent_buffer *eb);
326int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
327 unsigned long min_len, char **map,
328 unsigned long *map_start,
329 unsigned long *map_len);
330int extent_range_uptodate(struct extent_io_tree *tree,
331 u64 start, u64 end);
332int extent_clear_unlock_delalloc(struct inode *inode,
333 struct extent_io_tree *tree,
334 u64 start, u64 end, struct page *locked_page,
335 unsigned long op);
336struct bio *
337btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
338 gfp_t gfp_flags);
339
340struct btrfs_mapping_tree;
341
342int repair_io_failure(struct btrfs_mapping_tree *map_tree, u64 start,
343 u64 length, u64 logical, struct page *page,
344 int mirror_num);
345int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
346int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
347 int mirror_num);
348#endif