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5
6#ifndef BTRFS_VOLUMES_H
7#define BTRFS_VOLUMES_H
8
9#include <linux/bio.h>
10#include <linux/sort.h>
11#include <linux/btrfs.h>
12#include "async-thread.h"
13
14#define BTRFS_MAX_DATA_CHUNK_SIZE (10ULL * SZ_1G)
15
16extern struct mutex uuid_mutex;
17
18#define BTRFS_STRIPE_LEN SZ_64K
19
20struct btrfs_io_geometry {
21
22 u64 len;
23
24 u64 offset;
25
26 u64 stripe_len;
27
28 u64 stripe_nr;
29
30 u64 stripe_offset;
31
32 u64 raid56_stripe_offset;
33};
34
35
36
37
38
39#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
40#include <linux/seqlock.h>
41#define __BTRFS_NEED_DEVICE_DATA_ORDERED
42#define btrfs_device_data_ordered_init(device) \
43 seqcount_init(&device->data_seqcount)
44#else
45#define btrfs_device_data_ordered_init(device) do { } while (0)
46#endif
47
48#define BTRFS_DEV_STATE_WRITEABLE (0)
49#define BTRFS_DEV_STATE_IN_FS_METADATA (1)
50#define BTRFS_DEV_STATE_MISSING (2)
51#define BTRFS_DEV_STATE_REPLACE_TGT (3)
52#define BTRFS_DEV_STATE_FLUSH_SENT (4)
53#define BTRFS_DEV_STATE_NO_READA (5)
54
55struct btrfs_zoned_device_info;
56
57struct btrfs_device {
58 struct list_head dev_list;
59 struct list_head dev_alloc_list;
60 struct list_head post_commit_list;
61 struct btrfs_fs_devices *fs_devices;
62 struct btrfs_fs_info *fs_info;
63
64 struct rcu_string __rcu *name;
65
66 u64 generation;
67
68 struct block_device *bdev;
69
70 struct btrfs_zoned_device_info *zone_info;
71
72
73 fmode_t mode;
74
75 unsigned long dev_state;
76 blk_status_t last_flush_error;
77
78#ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED
79 seqcount_t data_seqcount;
80#endif
81
82
83 u64 devid;
84
85
86 u64 total_bytes;
87
88
89 u64 disk_total_bytes;
90
91
92 u64 bytes_used;
93
94
95 u32 io_align;
96
97
98 u32 io_width;
99
100 u64 type;
101
102
103 u32 sector_size;
104
105
106 u8 uuid[BTRFS_UUID_SIZE];
107
108
109
110
111
112
113
114 u64 commit_total_bytes;
115
116
117 u64 commit_bytes_used;
118
119
120 struct bio *flush_bio;
121 struct completion flush_wait;
122
123
124 struct scrub_ctx *scrub_ctx;
125
126
127 atomic_t reada_in_flight;
128 u64 reada_next;
129 struct reada_zone *reada_curr_zone;
130 struct radix_tree_root reada_zones;
131 struct radix_tree_root reada_extents;
132
133
134
135 int dev_stats_valid;
136
137
138 atomic_t dev_stats_ccnt;
139 atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
140
141 struct extent_io_tree alloc_state;
142
143 struct completion kobj_unregister;
144
145 struct kobject devid_kobj;
146
147
148 u64 scrub_speed_max;
149};
150
151
152
153
154
155#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
156#define BTRFS_DEVICE_GETSET_FUNCS(name) \
157static inline u64 \
158btrfs_device_get_##name(const struct btrfs_device *dev) \
159{ \
160 u64 size; \
161 unsigned int seq; \
162 \
163 do { \
164 seq = read_seqcount_begin(&dev->data_seqcount); \
165 size = dev->name; \
166 } while (read_seqcount_retry(&dev->data_seqcount, seq)); \
167 return size; \
168} \
169 \
170static inline void \
171btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
172{ \
173 preempt_disable(); \
174 write_seqcount_begin(&dev->data_seqcount); \
175 dev->name = size; \
176 write_seqcount_end(&dev->data_seqcount); \
177 preempt_enable(); \
178}
179#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
180#define BTRFS_DEVICE_GETSET_FUNCS(name) \
181static inline u64 \
182btrfs_device_get_##name(const struct btrfs_device *dev) \
183{ \
184 u64 size; \
185 \
186 preempt_disable(); \
187 size = dev->name; \
188 preempt_enable(); \
189 return size; \
190} \
191 \
192static inline void \
193btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
194{ \
195 preempt_disable(); \
196 dev->name = size; \
197 preempt_enable(); \
198}
199#else
200#define BTRFS_DEVICE_GETSET_FUNCS(name) \
201static inline u64 \
202btrfs_device_get_##name(const struct btrfs_device *dev) \
203{ \
204 return dev->name; \
205} \
206 \
207static inline void \
208btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
209{ \
210 dev->name = size; \
211}
212#endif
213
214BTRFS_DEVICE_GETSET_FUNCS(total_bytes);
215BTRFS_DEVICE_GETSET_FUNCS(disk_total_bytes);
216BTRFS_DEVICE_GETSET_FUNCS(bytes_used);
217
218enum btrfs_chunk_allocation_policy {
219 BTRFS_CHUNK_ALLOC_REGULAR,
220 BTRFS_CHUNK_ALLOC_ZONED,
221};
222
223
224
225
226
227enum btrfs_read_policy {
228
229 BTRFS_READ_POLICY_PID,
230 BTRFS_NR_READ_POLICY,
231};
232
233struct btrfs_fs_devices {
234 u8 fsid[BTRFS_FSID_SIZE];
235 u8 metadata_uuid[BTRFS_FSID_SIZE];
236 bool fsid_change;
237 struct list_head fs_list;
238
239 u64 num_devices;
240 u64 open_devices;
241 u64 rw_devices;
242 u64 missing_devices;
243 u64 total_rw_bytes;
244 u64 total_devices;
245
246
247 u64 latest_generation;
248
249 struct block_device *latest_bdev;
250
251
252
253
254
255
256
257 struct mutex device_list_mutex;
258
259
260 struct list_head devices;
261
262
263
264
265
266 struct list_head alloc_list;
267
268 struct list_head seed_list;
269 bool seeding;
270
271 int opened;
272
273
274
275
276 bool rotating;
277
278 struct btrfs_fs_info *fs_info;
279
280 struct kobject fsid_kobj;
281 struct kobject *devices_kobj;
282 struct kobject *devinfo_kobj;
283 struct completion kobj_unregister;
284
285 enum btrfs_chunk_allocation_policy chunk_alloc_policy;
286
287
288 enum btrfs_read_policy read_policy;
289};
290
291#define BTRFS_BIO_INLINE_CSUM_SIZE 64
292
293#define BTRFS_MAX_DEVS(info) ((BTRFS_MAX_ITEM_SIZE(info) \
294 - sizeof(struct btrfs_chunk)) \
295 / sizeof(struct btrfs_stripe) + 1)
296
297#define BTRFS_MAX_DEVS_SYS_CHUNK ((BTRFS_SYSTEM_CHUNK_ARRAY_SIZE \
298 - 2 * sizeof(struct btrfs_disk_key) \
299 - 2 * sizeof(struct btrfs_chunk)) \
300 / sizeof(struct btrfs_stripe) + 1)
301
302
303
304
305
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307
308
309
310
311struct btrfs_io_bio {
312 unsigned int mirror_num;
313 struct btrfs_device *device;
314 u64 logical;
315 u8 *csum;
316 u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
317 struct bvec_iter iter;
318
319
320
321
322 struct bio bio;
323};
324
325static inline struct btrfs_io_bio *btrfs_io_bio(struct bio *bio)
326{
327 return container_of(bio, struct btrfs_io_bio, bio);
328}
329
330static inline void btrfs_io_bio_free_csum(struct btrfs_io_bio *io_bio)
331{
332 if (io_bio->csum != io_bio->csum_inline) {
333 kfree(io_bio->csum);
334 io_bio->csum = NULL;
335 }
336}
337
338struct btrfs_bio_stripe {
339 struct btrfs_device *dev;
340 u64 physical;
341 u64 length;
342};
343
344struct btrfs_bio {
345 refcount_t refs;
346 atomic_t stripes_pending;
347 struct btrfs_fs_info *fs_info;
348 u64 map_type;
349 bio_end_io_t *end_io;
350 struct bio *orig_bio;
351 void *private;
352 atomic_t error;
353 int max_errors;
354 int num_stripes;
355 int mirror_num;
356 int num_tgtdevs;
357 int *tgtdev_map;
358
359
360
361
362
363 u64 *raid_map;
364 struct btrfs_bio_stripe stripes[];
365};
366
367struct btrfs_device_info {
368 struct btrfs_device *dev;
369 u64 dev_offset;
370 u64 max_avail;
371 u64 total_avail;
372};
373
374struct btrfs_raid_attr {
375 u8 sub_stripes;
376 u8 dev_stripes;
377 u8 devs_max;
378 u8 devs_min;
379 u8 tolerated_failures;
380 u8 devs_increment;
381 u8 ncopies;
382 u8 nparity;
383
384 u8 mindev_error;
385 const char raid_name[8];
386 u64 bg_flag;
387};
388
389extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES];
390
391struct map_lookup {
392 u64 type;
393 int io_align;
394 int io_width;
395 u64 stripe_len;
396 int num_stripes;
397 int sub_stripes;
398 int verified_stripes;
399 struct btrfs_bio_stripe stripes[];
400};
401
402#define map_lookup_size(n) (sizeof(struct map_lookup) + \
403 (sizeof(struct btrfs_bio_stripe) * (n)))
404
405struct btrfs_balance_args;
406struct btrfs_balance_progress;
407struct btrfs_balance_control {
408 struct btrfs_balance_args data;
409 struct btrfs_balance_args meta;
410 struct btrfs_balance_args sys;
411
412 u64 flags;
413
414 struct btrfs_balance_progress stat;
415};
416
417enum btrfs_map_op {
418 BTRFS_MAP_READ,
419 BTRFS_MAP_WRITE,
420 BTRFS_MAP_DISCARD,
421 BTRFS_MAP_GET_READ_MIRRORS,
422};
423
424static inline enum btrfs_map_op btrfs_op(struct bio *bio)
425{
426 switch (bio_op(bio)) {
427 case REQ_OP_DISCARD:
428 return BTRFS_MAP_DISCARD;
429 case REQ_OP_WRITE:
430 case REQ_OP_ZONE_APPEND:
431 return BTRFS_MAP_WRITE;
432 default:
433 WARN_ON_ONCE(1);
434 fallthrough;
435 case REQ_OP_READ:
436 return BTRFS_MAP_READ;
437 }
438}
439
440void btrfs_get_bbio(struct btrfs_bio *bbio);
441void btrfs_put_bbio(struct btrfs_bio *bbio);
442int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
443 u64 logical, u64 *length,
444 struct btrfs_bio **bbio_ret, int mirror_num);
445int btrfs_map_sblock(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
446 u64 logical, u64 *length,
447 struct btrfs_bio **bbio_ret);
448int btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, struct extent_map *map,
449 enum btrfs_map_op op, u64 logical,
450 struct btrfs_io_geometry *io_geom);
451int btrfs_read_sys_array(struct btrfs_fs_info *fs_info);
452int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info);
453struct btrfs_block_group *btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
454 u64 type);
455void btrfs_mapping_tree_free(struct extent_map_tree *tree);
456blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
457 int mirror_num);
458int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
459 fmode_t flags, void *holder);
460struct btrfs_device *btrfs_scan_one_device(const char *path,
461 fmode_t flags, void *holder);
462int btrfs_forget_devices(const char *path);
463void btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
464void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices);
465void btrfs_assign_next_active_device(struct btrfs_device *device,
466 struct btrfs_device *this_dev);
467struct btrfs_device *btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info,
468 u64 devid,
469 const char *devpath);
470struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
471 const u64 *devid,
472 const u8 *uuid);
473void btrfs_free_device(struct btrfs_device *device);
474int btrfs_rm_device(struct btrfs_fs_info *fs_info,
475 const char *device_path, u64 devid,
476 struct block_device **bdev, fmode_t *mode);
477void __exit btrfs_cleanup_fs_uuids(void);
478int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
479int btrfs_grow_device(struct btrfs_trans_handle *trans,
480 struct btrfs_device *device, u64 new_size);
481struct btrfs_device *btrfs_find_device(struct btrfs_fs_devices *fs_devices,
482 u64 devid, u8 *uuid, u8 *fsid);
483int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
484int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *path);
485int btrfs_balance(struct btrfs_fs_info *fs_info,
486 struct btrfs_balance_control *bctl,
487 struct btrfs_ioctl_balance_args *bargs);
488void btrfs_describe_block_groups(u64 flags, char *buf, u32 size_buf);
489int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
490int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
491int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
492int btrfs_relocate_chunk(struct btrfs_fs_info *fs_info, u64 chunk_offset);
493int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
494int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
495int btrfs_uuid_scan_kthread(void *data);
496int btrfs_chunk_readonly(struct btrfs_fs_info *fs_info, u64 chunk_offset);
497int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes,
498 u64 *start, u64 *max_avail);
499void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
500int btrfs_get_dev_stats(struct btrfs_fs_info *fs_info,
501 struct btrfs_ioctl_get_dev_stats *stats);
502void btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
503int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
504int btrfs_run_dev_stats(struct btrfs_trans_handle *trans);
505void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_device *srcdev);
506void btrfs_rm_dev_replace_free_srcdev(struct btrfs_device *srcdev);
507void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device *tgtdev);
508int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info,
509 u64 logical, u64 len);
510unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
511 u64 logical);
512int btrfs_chunk_alloc_add_chunk_item(struct btrfs_trans_handle *trans,
513 struct btrfs_block_group *bg);
514int btrfs_remove_chunk(struct btrfs_trans_handle *trans, u64 chunk_offset);
515struct extent_map *btrfs_get_chunk_map(struct btrfs_fs_info *fs_info,
516 u64 logical, u64 length);
517void btrfs_release_disk_super(struct btrfs_super_block *super);
518
519static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
520 int index)
521{
522 atomic_inc(dev->dev_stat_values + index);
523
524
525
526
527
528
529 smp_mb__before_atomic();
530 atomic_inc(&dev->dev_stats_ccnt);
531}
532
533static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
534 int index)
535{
536 return atomic_read(dev->dev_stat_values + index);
537}
538
539static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
540 int index)
541{
542 int ret;
543
544 ret = atomic_xchg(dev->dev_stat_values + index, 0);
545
546
547
548
549
550
551
552 atomic_inc(&dev->dev_stats_ccnt);
553 return ret;
554}
555
556static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
557 int index, unsigned long val)
558{
559 atomic_set(dev->dev_stat_values + index, val);
560
561
562
563
564
565
566 smp_mb__before_atomic();
567 atomic_inc(&dev->dev_stats_ccnt);
568}
569
570void btrfs_commit_device_sizes(struct btrfs_transaction *trans);
571
572struct list_head * __attribute_const__ btrfs_get_fs_uuids(void);
573bool btrfs_check_rw_degradable(struct btrfs_fs_info *fs_info,
574 struct btrfs_device *failing_dev);
575void btrfs_scratch_superblocks(struct btrfs_fs_info *fs_info,
576 struct block_device *bdev,
577 const char *device_path);
578
579enum btrfs_raid_types __attribute_const__ btrfs_bg_flags_to_raid_index(u64 flags);
580int btrfs_bg_type_to_factor(u64 flags);
581const char *btrfs_bg_type_to_raid_name(u64 flags);
582int btrfs_verify_dev_extents(struct btrfs_fs_info *fs_info);
583int btrfs_repair_one_zone(struct btrfs_fs_info *fs_info, u64 logical);
584
585#endif
586