1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright (C) 2007 Oracle. All rights reserved.
4 */
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
16 extern struct mutex uuid_mutex;
17
18 #define BTRFS_STRIPE_LEN SZ_64K
19
20 /* Used by sanity check for btrfs_raid_types. */
21 #define const_ffs(n) (__builtin_ctzll(n) + 1)
22
23 /*
24 * The conversion from BTRFS_BLOCK_GROUP_* bits to btrfs_raid_type requires
25 * RAID0 always to be the lowest profile bit.
26 * Although it's part of on-disk format and should never change, do extra
27 * compile-time sanity checks.
28 */
29 static_assert(const_ffs(BTRFS_BLOCK_GROUP_RAID0) <
30 const_ffs(BTRFS_BLOCK_GROUP_PROFILE_MASK & ~BTRFS_BLOCK_GROUP_RAID0));
31 static_assert(const_ilog2(BTRFS_BLOCK_GROUP_RAID0) >
32 ilog2(BTRFS_BLOCK_GROUP_TYPE_MASK));
33
34 /* ilog2() can handle both constants and variables */
35 #define BTRFS_BG_FLAG_TO_INDEX(profile) \
36 ilog2((profile) >> (ilog2(BTRFS_BLOCK_GROUP_RAID0) - 1))
37
38 enum btrfs_raid_types {
39 /* SINGLE is the special one as it doesn't have on-disk bit. */
40 BTRFS_RAID_SINGLE = 0,
41
42 BTRFS_RAID_RAID0 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID0),
43 BTRFS_RAID_RAID1 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1),
44 BTRFS_RAID_DUP = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_DUP),
45 BTRFS_RAID_RAID10 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID10),
46 BTRFS_RAID_RAID5 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID5),
47 BTRFS_RAID_RAID6 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID6),
48 BTRFS_RAID_RAID1C3 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1C3),
49 BTRFS_RAID_RAID1C4 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1C4),
50
51 BTRFS_NR_RAID_TYPES
52 };
53
54 struct btrfs_io_geometry {
55 /* remaining bytes before crossing a stripe */
56 u64 len;
57 /* offset of logical address in chunk */
58 u64 offset;
59 /* length of single IO stripe */
60 u32 stripe_len;
61 /* offset of address in stripe */
62 u32 stripe_offset;
63 /* number of stripe where address falls */
64 u64 stripe_nr;
65 /* offset of raid56 stripe into the chunk */
66 u64 raid56_stripe_offset;
67 };
68
69 /*
70 * Use sequence counter to get consistent device stat data on
71 * 32-bit processors.
72 */
73 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
74 #include <linux/seqlock.h>
75 #define __BTRFS_NEED_DEVICE_DATA_ORDERED
76 #define btrfs_device_data_ordered_init(device) \
77 seqcount_init(&device->data_seqcount)
78 #else
79 #define btrfs_device_data_ordered_init(device) do { } while (0)
80 #endif
81
82 #define BTRFS_DEV_STATE_WRITEABLE (0)
83 #define BTRFS_DEV_STATE_IN_FS_METADATA (1)
84 #define BTRFS_DEV_STATE_MISSING (2)
85 #define BTRFS_DEV_STATE_REPLACE_TGT (3)
86 #define BTRFS_DEV_STATE_FLUSH_SENT (4)
87 #define BTRFS_DEV_STATE_NO_READA (5)
88
89 struct btrfs_zoned_device_info;
90
91 struct btrfs_device {
92 struct list_head dev_list; /* device_list_mutex */
93 struct list_head dev_alloc_list; /* chunk mutex */
94 struct list_head post_commit_list; /* chunk mutex */
95 struct btrfs_fs_devices *fs_devices;
96 struct btrfs_fs_info *fs_info;
97
98 struct rcu_string __rcu *name;
99
100 u64 generation;
101
102 struct block_device *bdev;
103
104 struct btrfs_zoned_device_info *zone_info;
105
106 /* the mode sent to blkdev_get */
107 fmode_t mode;
108
109 /*
110 * Device's major-minor number. Must be set even if the device is not
111 * opened (bdev == NULL), unless the device is missing.
112 */
113 dev_t devt;
114 unsigned long dev_state;
115 blk_status_t last_flush_error;
116
117 #ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED
118 seqcount_t data_seqcount;
119 #endif
120
121 /* the internal btrfs device id */
122 u64 devid;
123
124 /* size of the device in memory */
125 u64 total_bytes;
126
127 /* size of the device on disk */
128 u64 disk_total_bytes;
129
130 /* bytes used */
131 u64 bytes_used;
132
133 /* optimal io alignment for this device */
134 u32 io_align;
135
136 /* optimal io width for this device */
137 u32 io_width;
138 /* type and info about this device */
139 u64 type;
140
141 /* minimal io size for this device */
142 u32 sector_size;
143
144 /* physical drive uuid (or lvm uuid) */
145 u8 uuid[BTRFS_UUID_SIZE];
146
147 /*
148 * size of the device on the current transaction
149 *
150 * This variant is update when committing the transaction,
151 * and protected by chunk mutex
152 */
153 u64 commit_total_bytes;
154
155 /* bytes used on the current transaction */
156 u64 commit_bytes_used;
157
158 /* Bio used for flushing device barriers */
159 struct bio flush_bio;
160 struct completion flush_wait;
161
162 /* per-device scrub information */
163 struct scrub_ctx *scrub_ctx;
164
165 /* disk I/O failure stats. For detailed description refer to
166 * enum btrfs_dev_stat_values in ioctl.h */
167 int dev_stats_valid;
168
169 /* Counter to record the change of device stats */
170 atomic_t dev_stats_ccnt;
171 atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
172
173 struct extent_io_tree alloc_state;
174
175 struct completion kobj_unregister;
176 /* For sysfs/FSID/devinfo/devid/ */
177 struct kobject devid_kobj;
178
179 /* Bandwidth limit for scrub, in bytes */
180 u64 scrub_speed_max;
181 };
182
183 /*
184 * Block group or device which contains an active swapfile. Used for preventing
185 * unsafe operations while a swapfile is active.
186 *
187 * These are sorted on (ptr, inode) (note that a block group or device can
188 * contain more than one swapfile). We compare the pointer values because we
189 * don't actually care what the object is, we just need a quick check whether
190 * the object exists in the rbtree.
191 */
192 struct btrfs_swapfile_pin {
193 struct rb_node node;
194 void *ptr;
195 struct inode *inode;
196 /*
197 * If true, ptr points to a struct btrfs_block_group. Otherwise, ptr
198 * points to a struct btrfs_device.
199 */
200 bool is_block_group;
201 /*
202 * Only used when 'is_block_group' is true and it is the number of
203 * extents used by a swapfile for this block group ('ptr' field).
204 */
205 int bg_extent_count;
206 };
207
208 /*
209 * If we read those variants at the context of their own lock, we needn't
210 * use the following helpers, reading them directly is safe.
211 */
212 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
213 #define BTRFS_DEVICE_GETSET_FUNCS(name) \
214 static inline u64 \
215 btrfs_device_get_##name(const struct btrfs_device *dev) \
216 { \
217 u64 size; \
218 unsigned int seq; \
219 \
220 do { \
221 seq = read_seqcount_begin(&dev->data_seqcount); \
222 size = dev->name; \
223 } while (read_seqcount_retry(&dev->data_seqcount, seq)); \
224 return size; \
225 } \
226 \
227 static inline void \
228 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
229 { \
230 preempt_disable(); \
231 write_seqcount_begin(&dev->data_seqcount); \
232 dev->name = size; \
233 write_seqcount_end(&dev->data_seqcount); \
234 preempt_enable(); \
235 }
236 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
237 #define BTRFS_DEVICE_GETSET_FUNCS(name) \
238 static inline u64 \
239 btrfs_device_get_##name(const struct btrfs_device *dev) \
240 { \
241 u64 size; \
242 \
243 preempt_disable(); \
244 size = dev->name; \
245 preempt_enable(); \
246 return size; \
247 } \
248 \
249 static inline void \
250 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
251 { \
252 preempt_disable(); \
253 dev->name = size; \
254 preempt_enable(); \
255 }
256 #else
257 #define BTRFS_DEVICE_GETSET_FUNCS(name) \
258 static inline u64 \
259 btrfs_device_get_##name(const struct btrfs_device *dev) \
260 { \
261 return dev->name; \
262 } \
263 \
264 static inline void \
265 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
266 { \
267 dev->name = size; \
268 }
269 #endif
270
271 BTRFS_DEVICE_GETSET_FUNCS(total_bytes);
272 BTRFS_DEVICE_GETSET_FUNCS(disk_total_bytes);
273 BTRFS_DEVICE_GETSET_FUNCS(bytes_used);
274
275 enum btrfs_chunk_allocation_policy {
276 BTRFS_CHUNK_ALLOC_REGULAR,
277 BTRFS_CHUNK_ALLOC_ZONED,
278 };
279
280 /*
281 * Read policies for mirrored block group profiles, read picks the stripe based
282 * on these policies.
283 */
284 enum btrfs_read_policy {
285 /* Use process PID to choose the stripe */
286 BTRFS_READ_POLICY_PID,
287 BTRFS_NR_READ_POLICY,
288 };
289
290 struct btrfs_fs_devices {
291 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
292 u8 metadata_uuid[BTRFS_FSID_SIZE];
293 bool fsid_change;
294 struct list_head fs_list;
295
296 /*
297 * Number of devices under this fsid including missing and
298 * replace-target device and excludes seed devices.
299 */
300 u64 num_devices;
301
302 /*
303 * The number of devices that successfully opened, including
304 * replace-target, excludes seed devices.
305 */
306 u64 open_devices;
307
308 /* The number of devices that are under the chunk allocation list. */
309 u64 rw_devices;
310
311 /* Count of missing devices under this fsid excluding seed device. */
312 u64 missing_devices;
313 u64 total_rw_bytes;
314
315 /*
316 * Count of devices from btrfs_super_block::num_devices for this fsid,
317 * which includes the seed device, excludes the transient replace-target
318 * device.
319 */
320 u64 total_devices;
321
322 /* Highest generation number of seen devices */
323 u64 latest_generation;
324
325 /*
326 * The mount device or a device with highest generation after removal
327 * or replace.
328 */
329 struct btrfs_device *latest_dev;
330
331 /* all of the devices in the FS, protected by a mutex
332 * so we can safely walk it to write out the supers without
333 * worrying about add/remove by the multi-device code.
334 * Scrubbing super can kick off supers writing by holding
335 * this mutex lock.
336 */
337 struct mutex device_list_mutex;
338
339 /* List of all devices, protected by device_list_mutex */
340 struct list_head devices;
341
342 /*
343 * Devices which can satisfy space allocation. Protected by
344 * chunk_mutex
345 */
346 struct list_head alloc_list;
347
348 struct list_head seed_list;
349 bool seeding;
350
351 int opened;
352
353 /* set when we find or add a device that doesn't have the
354 * nonrot flag set
355 */
356 bool rotating;
357
358 struct btrfs_fs_info *fs_info;
359 /* sysfs kobjects */
360 struct kobject fsid_kobj;
361 struct kobject *devices_kobj;
362 struct kobject *devinfo_kobj;
363 struct completion kobj_unregister;
364
365 enum btrfs_chunk_allocation_policy chunk_alloc_policy;
366
367 /* Policy used to read the mirrored stripes */
368 enum btrfs_read_policy read_policy;
369 };
370
371 #define BTRFS_BIO_INLINE_CSUM_SIZE 64
372
373 #define BTRFS_MAX_DEVS(info) ((BTRFS_MAX_ITEM_SIZE(info) \
374 - sizeof(struct btrfs_chunk)) \
375 / sizeof(struct btrfs_stripe) + 1)
376
377 #define BTRFS_MAX_DEVS_SYS_CHUNK ((BTRFS_SYSTEM_CHUNK_ARRAY_SIZE \
378 - 2 * sizeof(struct btrfs_disk_key) \
379 - 2 * sizeof(struct btrfs_chunk)) \
380 / sizeof(struct btrfs_stripe) + 1)
381
382 /*
383 * Maximum number of sectors for a single bio to limit the size of the
384 * checksum array. This matches the number of bio_vecs per bio and thus the
385 * I/O size for buffered I/O.
386 */
387 #define BTRFS_MAX_BIO_SECTORS (256)
388
389 typedef void (*btrfs_bio_end_io_t)(struct btrfs_bio *bbio);
390
391 /*
392 * Additional info to pass along bio.
393 *
394 * Mostly for btrfs specific features like csum and mirror_num.
395 */
396 struct btrfs_bio {
397 unsigned int mirror_num;
398 struct bvec_iter iter;
399
400 /* for direct I/O */
401 u64 file_offset;
402
403 /* @device is for stripe IO submission. */
404 struct btrfs_device *device;
405 u8 *csum;
406 u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
407
408 /* End I/O information supplied to btrfs_bio_alloc */
409 btrfs_bio_end_io_t end_io;
410 void *private;
411
412 /* For read end I/O handling */
413 struct work_struct end_io_work;
414
415 /*
416 * This member must come last, bio_alloc_bioset will allocate enough
417 * bytes for entire btrfs_bio but relies on bio being last.
418 */
419 struct bio bio;
420 };
421
btrfs_bio(struct bio * bio)422 static inline struct btrfs_bio *btrfs_bio(struct bio *bio)
423 {
424 return container_of(bio, struct btrfs_bio, bio);
425 }
426
427 int __init btrfs_bioset_init(void);
428 void __cold btrfs_bioset_exit(void);
429
430 struct bio *btrfs_bio_alloc(unsigned int nr_vecs, blk_opf_t opf,
431 btrfs_bio_end_io_t end_io, void *private);
432 struct bio *btrfs_bio_clone_partial(struct bio *orig, u64 offset, u64 size,
433 btrfs_bio_end_io_t end_io, void *private);
434
btrfs_bio_end_io(struct btrfs_bio * bbio,blk_status_t status)435 static inline void btrfs_bio_end_io(struct btrfs_bio *bbio, blk_status_t status)
436 {
437 bbio->bio.bi_status = status;
438 bbio->end_io(bbio);
439 }
440
btrfs_bio_free_csum(struct btrfs_bio * bbio)441 static inline void btrfs_bio_free_csum(struct btrfs_bio *bbio)
442 {
443 if (bbio->csum != bbio->csum_inline) {
444 kfree(bbio->csum);
445 bbio->csum = NULL;
446 }
447 }
448
449 /*
450 * Iterate through a btrfs_bio (@bbio) on a per-sector basis.
451 *
452 * bvl - struct bio_vec
453 * bbio - struct btrfs_bio
454 * iters - struct bvec_iter
455 * bio_offset - unsigned int
456 */
457 #define btrfs_bio_for_each_sector(fs_info, bvl, bbio, iter, bio_offset) \
458 for ((iter) = (bbio)->iter, (bio_offset) = 0; \
459 (iter).bi_size && \
460 (((bvl) = bio_iter_iovec((&(bbio)->bio), (iter))), 1); \
461 (bio_offset) += fs_info->sectorsize, \
462 bio_advance_iter_single(&(bbio)->bio, &(iter), \
463 (fs_info)->sectorsize))
464
465 struct btrfs_io_stripe {
466 struct btrfs_device *dev;
467 union {
468 /* Block mapping */
469 u64 physical;
470 /* For the endio handler */
471 struct btrfs_io_context *bioc;
472 };
473 };
474
475 struct btrfs_discard_stripe {
476 struct btrfs_device *dev;
477 u64 physical;
478 u64 length;
479 };
480
481 /*
482 * Context for IO subsmission for device stripe.
483 *
484 * - Track the unfinished mirrors for mirror based profiles
485 * Mirror based profiles are SINGLE/DUP/RAID1/RAID10.
486 *
487 * - Contain the logical -> physical mapping info
488 * Used by submit_stripe_bio() for mapping logical bio
489 * into physical device address.
490 *
491 * - Contain device replace info
492 * Used by handle_ops_on_dev_replace() to copy logical bios
493 * into the new device.
494 *
495 * - Contain RAID56 full stripe logical bytenrs
496 */
497 struct btrfs_io_context {
498 refcount_t refs;
499 struct btrfs_fs_info *fs_info;
500 u64 map_type; /* get from map_lookup->type */
501 struct bio *orig_bio;
502 atomic_t error;
503 int max_errors;
504 int num_stripes;
505 int mirror_num;
506 int num_tgtdevs;
507 int *tgtdev_map;
508 /*
509 * logical block numbers for the start of each stripe
510 * The last one or two are p/q. These are sorted,
511 * so raid_map[0] is the start of our full stripe
512 */
513 u64 *raid_map;
514 struct btrfs_io_stripe stripes[];
515 };
516
517 struct btrfs_device_info {
518 struct btrfs_device *dev;
519 u64 dev_offset;
520 u64 max_avail;
521 u64 total_avail;
522 };
523
524 struct btrfs_raid_attr {
525 u8 sub_stripes; /* sub_stripes info for map */
526 u8 dev_stripes; /* stripes per dev */
527 u8 devs_max; /* max devs to use */
528 u8 devs_min; /* min devs needed */
529 u8 tolerated_failures; /* max tolerated fail devs */
530 u8 devs_increment; /* ndevs has to be a multiple of this */
531 u8 ncopies; /* how many copies to data has */
532 u8 nparity; /* number of stripes worth of bytes to store
533 * parity information */
534 u8 mindev_error; /* error code if min devs requisite is unmet */
535 const char raid_name[8]; /* name of the raid */
536 u64 bg_flag; /* block group flag of the raid */
537 };
538
539 extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES];
540
541 struct map_lookup {
542 u64 type;
543 int io_align;
544 int io_width;
545 u32 stripe_len;
546 int num_stripes;
547 int sub_stripes;
548 int verified_stripes; /* For mount time dev extent verification */
549 struct btrfs_io_stripe stripes[];
550 };
551
552 #define map_lookup_size(n) (sizeof(struct map_lookup) + \
553 (sizeof(struct btrfs_io_stripe) * (n)))
554
555 struct btrfs_balance_args;
556 struct btrfs_balance_progress;
557 struct btrfs_balance_control {
558 struct btrfs_balance_args data;
559 struct btrfs_balance_args meta;
560 struct btrfs_balance_args sys;
561
562 u64 flags;
563
564 struct btrfs_balance_progress stat;
565 };
566
567 /*
568 * Search for a given device by the set parameters
569 */
570 struct btrfs_dev_lookup_args {
571 u64 devid;
572 u8 *uuid;
573 u8 *fsid;
574 bool missing;
575 };
576
577 /* We have to initialize to -1 because BTRFS_DEV_REPLACE_DEVID is 0 */
578 #define BTRFS_DEV_LOOKUP_ARGS_INIT { .devid = (u64)-1 }
579
580 #define BTRFS_DEV_LOOKUP_ARGS(name) \
581 struct btrfs_dev_lookup_args name = BTRFS_DEV_LOOKUP_ARGS_INIT
582
583 enum btrfs_map_op {
584 BTRFS_MAP_READ,
585 BTRFS_MAP_WRITE,
586 BTRFS_MAP_DISCARD,
587 BTRFS_MAP_GET_READ_MIRRORS,
588 };
589
btrfs_op(struct bio * bio)590 static inline enum btrfs_map_op btrfs_op(struct bio *bio)
591 {
592 switch (bio_op(bio)) {
593 case REQ_OP_DISCARD:
594 return BTRFS_MAP_DISCARD;
595 case REQ_OP_WRITE:
596 case REQ_OP_ZONE_APPEND:
597 return BTRFS_MAP_WRITE;
598 default:
599 WARN_ON_ONCE(1);
600 fallthrough;
601 case REQ_OP_READ:
602 return BTRFS_MAP_READ;
603 }
604 }
605
606 void btrfs_get_bioc(struct btrfs_io_context *bioc);
607 void btrfs_put_bioc(struct btrfs_io_context *bioc);
608 int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
609 u64 logical, u64 *length,
610 struct btrfs_io_context **bioc_ret, int mirror_num);
611 int btrfs_map_sblock(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
612 u64 logical, u64 *length,
613 struct btrfs_io_context **bioc_ret);
614 struct btrfs_discard_stripe *btrfs_map_discard(struct btrfs_fs_info *fs_info,
615 u64 logical, u64 *length_ret,
616 u32 *num_stripes);
617 int btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, struct extent_map *map,
618 enum btrfs_map_op op, u64 logical,
619 struct btrfs_io_geometry *io_geom);
620 int btrfs_read_sys_array(struct btrfs_fs_info *fs_info);
621 int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info);
622 struct btrfs_block_group *btrfs_create_chunk(struct btrfs_trans_handle *trans,
623 u64 type);
624 void btrfs_mapping_tree_free(struct extent_map_tree *tree);
625 void btrfs_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio, int mirror_num);
626 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
627 fmode_t flags, void *holder);
628 struct btrfs_device *btrfs_scan_one_device(const char *path,
629 fmode_t flags, void *holder);
630 int btrfs_forget_devices(dev_t devt);
631 void btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
632 void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices);
633 void btrfs_assign_next_active_device(struct btrfs_device *device,
634 struct btrfs_device *this_dev);
635 struct btrfs_device *btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info,
636 u64 devid,
637 const char *devpath);
638 int btrfs_get_dev_args_from_path(struct btrfs_fs_info *fs_info,
639 struct btrfs_dev_lookup_args *args,
640 const char *path);
641 struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
642 const u64 *devid,
643 const u8 *uuid);
644 void btrfs_put_dev_args_from_path(struct btrfs_dev_lookup_args *args);
645 void btrfs_free_device(struct btrfs_device *device);
646 int btrfs_rm_device(struct btrfs_fs_info *fs_info,
647 struct btrfs_dev_lookup_args *args,
648 struct block_device **bdev, fmode_t *mode);
649 void __exit btrfs_cleanup_fs_uuids(void);
650 int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
651 int btrfs_grow_device(struct btrfs_trans_handle *trans,
652 struct btrfs_device *device, u64 new_size);
653 struct btrfs_device *btrfs_find_device(const struct btrfs_fs_devices *fs_devices,
654 const struct btrfs_dev_lookup_args *args);
655 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
656 int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *path);
657 int btrfs_balance(struct btrfs_fs_info *fs_info,
658 struct btrfs_balance_control *bctl,
659 struct btrfs_ioctl_balance_args *bargs);
660 void btrfs_describe_block_groups(u64 flags, char *buf, u32 size_buf);
661 int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
662 int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
663 int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
664 int btrfs_relocate_chunk(struct btrfs_fs_info *fs_info, u64 chunk_offset);
665 int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
666 int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
667 int btrfs_uuid_scan_kthread(void *data);
668 bool btrfs_chunk_writeable(struct btrfs_fs_info *fs_info, u64 chunk_offset);
669 int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes,
670 u64 *start, u64 *max_avail);
671 void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
672 int btrfs_get_dev_stats(struct btrfs_fs_info *fs_info,
673 struct btrfs_ioctl_get_dev_stats *stats);
674 int btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
675 int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
676 int btrfs_run_dev_stats(struct btrfs_trans_handle *trans);
677 void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_device *srcdev);
678 void btrfs_rm_dev_replace_free_srcdev(struct btrfs_device *srcdev);
679 void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device *tgtdev);
680 int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info,
681 u64 logical, u64 len);
682 unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
683 u64 logical);
684 u64 btrfs_calc_stripe_length(const struct extent_map *em);
685 int btrfs_nr_parity_stripes(u64 type);
686 int btrfs_chunk_alloc_add_chunk_item(struct btrfs_trans_handle *trans,
687 struct btrfs_block_group *bg);
688 int btrfs_remove_chunk(struct btrfs_trans_handle *trans, u64 chunk_offset);
689 struct extent_map *btrfs_get_chunk_map(struct btrfs_fs_info *fs_info,
690 u64 logical, u64 length);
691 void btrfs_release_disk_super(struct btrfs_super_block *super);
692
btrfs_dev_stat_inc(struct btrfs_device * dev,int index)693 static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
694 int index)
695 {
696 atomic_inc(dev->dev_stat_values + index);
697 /*
698 * This memory barrier orders stores updating statistics before stores
699 * updating dev_stats_ccnt.
700 *
701 * It pairs with smp_rmb() in btrfs_run_dev_stats().
702 */
703 smp_mb__before_atomic();
704 atomic_inc(&dev->dev_stats_ccnt);
705 }
706
btrfs_dev_stat_read(struct btrfs_device * dev,int index)707 static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
708 int index)
709 {
710 return atomic_read(dev->dev_stat_values + index);
711 }
712
btrfs_dev_stat_read_and_reset(struct btrfs_device * dev,int index)713 static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
714 int index)
715 {
716 int ret;
717
718 ret = atomic_xchg(dev->dev_stat_values + index, 0);
719 /*
720 * atomic_xchg implies a full memory barriers as per atomic_t.txt:
721 * - RMW operations that have a return value are fully ordered;
722 *
723 * This implicit memory barriers is paired with the smp_rmb in
724 * btrfs_run_dev_stats
725 */
726 atomic_inc(&dev->dev_stats_ccnt);
727 return ret;
728 }
729
btrfs_dev_stat_set(struct btrfs_device * dev,int index,unsigned long val)730 static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
731 int index, unsigned long val)
732 {
733 atomic_set(dev->dev_stat_values + index, val);
734 /*
735 * This memory barrier orders stores updating statistics before stores
736 * updating dev_stats_ccnt.
737 *
738 * It pairs with smp_rmb() in btrfs_run_dev_stats().
739 */
740 smp_mb__before_atomic();
741 atomic_inc(&dev->dev_stats_ccnt);
742 }
743
744 void btrfs_commit_device_sizes(struct btrfs_transaction *trans);
745
746 struct list_head * __attribute_const__ btrfs_get_fs_uuids(void);
747 bool btrfs_check_rw_degradable(struct btrfs_fs_info *fs_info,
748 struct btrfs_device *failing_dev);
749 void btrfs_scratch_superblocks(struct btrfs_fs_info *fs_info,
750 struct block_device *bdev,
751 const char *device_path);
752
753 enum btrfs_raid_types __attribute_const__ btrfs_bg_flags_to_raid_index(u64 flags);
754 int btrfs_bg_type_to_factor(u64 flags);
755 const char *btrfs_bg_type_to_raid_name(u64 flags);
756 int btrfs_verify_dev_extents(struct btrfs_fs_info *fs_info);
757 bool btrfs_repair_one_zone(struct btrfs_fs_info *fs_info, u64 logical);
758
759 bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr);
760
761 #endif
762