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/sort.h>
10 #include <linux/btrfs.h>
11 #include "async-thread.h"
12 #include "messages.h"
13 #include "tree-checker.h"
14 #include "rcu-string.h"
15
16 #define BTRFS_MAX_DATA_CHUNK_SIZE (10ULL * SZ_1G)
17
18 extern struct mutex uuid_mutex;
19
20 #define BTRFS_STRIPE_LEN SZ_64K
21 #define BTRFS_STRIPE_LEN_SHIFT (16)
22 #define BTRFS_STRIPE_LEN_MASK (BTRFS_STRIPE_LEN - 1)
23
24 static_assert(const_ilog2(BTRFS_STRIPE_LEN) == BTRFS_STRIPE_LEN_SHIFT);
25
26 /* Used by sanity check for btrfs_raid_types. */
27 #define const_ffs(n) (__builtin_ctzll(n) + 1)
28
29 /*
30 * The conversion from BTRFS_BLOCK_GROUP_* bits to btrfs_raid_type requires
31 * RAID0 always to be the lowest profile bit.
32 * Although it's part of on-disk format and should never change, do extra
33 * compile-time sanity checks.
34 */
35 static_assert(const_ffs(BTRFS_BLOCK_GROUP_RAID0) <
36 const_ffs(BTRFS_BLOCK_GROUP_PROFILE_MASK & ~BTRFS_BLOCK_GROUP_RAID0));
37 static_assert(const_ilog2(BTRFS_BLOCK_GROUP_RAID0) >
38 ilog2(BTRFS_BLOCK_GROUP_TYPE_MASK));
39
40 /* ilog2() can handle both constants and variables */
41 #define BTRFS_BG_FLAG_TO_INDEX(profile) \
42 ilog2((profile) >> (ilog2(BTRFS_BLOCK_GROUP_RAID0) - 1))
43
44 enum btrfs_raid_types {
45 /* SINGLE is the special one as it doesn't have on-disk bit. */
46 BTRFS_RAID_SINGLE = 0,
47
48 BTRFS_RAID_RAID0 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID0),
49 BTRFS_RAID_RAID1 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1),
50 BTRFS_RAID_DUP = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_DUP),
51 BTRFS_RAID_RAID10 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID10),
52 BTRFS_RAID_RAID5 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID5),
53 BTRFS_RAID_RAID6 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID6),
54 BTRFS_RAID_RAID1C3 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1C3),
55 BTRFS_RAID_RAID1C4 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1C4),
56
57 BTRFS_NR_RAID_TYPES
58 };
59
60 /*
61 * Use sequence counter to get consistent device stat data on
62 * 32-bit processors.
63 */
64 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
65 #include <linux/seqlock.h>
66 #define __BTRFS_NEED_DEVICE_DATA_ORDERED
67 #define btrfs_device_data_ordered_init(device) \
68 seqcount_init(&device->data_seqcount)
69 #else
70 #define btrfs_device_data_ordered_init(device) do { } while (0)
71 #endif
72
73 #define BTRFS_DEV_STATE_WRITEABLE (0)
74 #define BTRFS_DEV_STATE_IN_FS_METADATA (1)
75 #define BTRFS_DEV_STATE_MISSING (2)
76 #define BTRFS_DEV_STATE_REPLACE_TGT (3)
77 #define BTRFS_DEV_STATE_FLUSH_SENT (4)
78 #define BTRFS_DEV_STATE_NO_READA (5)
79
80 struct btrfs_zoned_device_info;
81
82 struct btrfs_device {
83 struct list_head dev_list; /* device_list_mutex */
84 struct list_head dev_alloc_list; /* chunk mutex */
85 struct list_head post_commit_list; /* chunk mutex */
86 struct btrfs_fs_devices *fs_devices;
87 struct btrfs_fs_info *fs_info;
88
89 struct rcu_string __rcu *name;
90
91 u64 generation;
92
93 struct block_device *bdev;
94
95 struct btrfs_zoned_device_info *zone_info;
96
97 /* block device holder for blkdev_get/put */
98 void *holder;
99
100 /*
101 * Device's major-minor number. Must be set even if the device is not
102 * opened (bdev == NULL), unless the device is missing.
103 */
104 dev_t devt;
105 unsigned long dev_state;
106 blk_status_t last_flush_error;
107
108 #ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED
109 seqcount_t data_seqcount;
110 #endif
111
112 /* the internal btrfs device id */
113 u64 devid;
114
115 /* size of the device in memory */
116 u64 total_bytes;
117
118 /* size of the device on disk */
119 u64 disk_total_bytes;
120
121 /* bytes used */
122 u64 bytes_used;
123
124 /* optimal io alignment for this device */
125 u32 io_align;
126
127 /* optimal io width for this device */
128 u32 io_width;
129 /* type and info about this device */
130 u64 type;
131
132 /* minimal io size for this device */
133 u32 sector_size;
134
135 /* physical drive uuid (or lvm uuid) */
136 u8 uuid[BTRFS_UUID_SIZE];
137
138 /*
139 * size of the device on the current transaction
140 *
141 * This variant is update when committing the transaction,
142 * and protected by chunk mutex
143 */
144 u64 commit_total_bytes;
145
146 /* bytes used on the current transaction */
147 u64 commit_bytes_used;
148
149 /* Bio used for flushing device barriers */
150 struct bio flush_bio;
151 struct completion flush_wait;
152
153 /* per-device scrub information */
154 struct scrub_ctx *scrub_ctx;
155
156 /* disk I/O failure stats. For detailed description refer to
157 * enum btrfs_dev_stat_values in ioctl.h */
158 int dev_stats_valid;
159
160 /* Counter to record the change of device stats */
161 atomic_t dev_stats_ccnt;
162 atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
163
164 struct extent_io_tree alloc_state;
165
166 struct completion kobj_unregister;
167 /* For sysfs/FSID/devinfo/devid/ */
168 struct kobject devid_kobj;
169
170 /* Bandwidth limit for scrub, in bytes */
171 u64 scrub_speed_max;
172 };
173
174 /*
175 * Block group or device which contains an active swapfile. Used for preventing
176 * unsafe operations while a swapfile is active.
177 *
178 * These are sorted on (ptr, inode) (note that a block group or device can
179 * contain more than one swapfile). We compare the pointer values because we
180 * don't actually care what the object is, we just need a quick check whether
181 * the object exists in the rbtree.
182 */
183 struct btrfs_swapfile_pin {
184 struct rb_node node;
185 void *ptr;
186 struct inode *inode;
187 /*
188 * If true, ptr points to a struct btrfs_block_group. Otherwise, ptr
189 * points to a struct btrfs_device.
190 */
191 bool is_block_group;
192 /*
193 * Only used when 'is_block_group' is true and it is the number of
194 * extents used by a swapfile for this block group ('ptr' field).
195 */
196 int bg_extent_count;
197 };
198
199 /*
200 * If we read those variants at the context of their own lock, we needn't
201 * use the following helpers, reading them directly is safe.
202 */
203 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
204 #define BTRFS_DEVICE_GETSET_FUNCS(name) \
205 static inline u64 \
206 btrfs_device_get_##name(const struct btrfs_device *dev) \
207 { \
208 u64 size; \
209 unsigned int seq; \
210 \
211 do { \
212 seq = read_seqcount_begin(&dev->data_seqcount); \
213 size = dev->name; \
214 } while (read_seqcount_retry(&dev->data_seqcount, seq)); \
215 return size; \
216 } \
217 \
218 static inline void \
219 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
220 { \
221 preempt_disable(); \
222 write_seqcount_begin(&dev->data_seqcount); \
223 dev->name = size; \
224 write_seqcount_end(&dev->data_seqcount); \
225 preempt_enable(); \
226 }
227 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
228 #define BTRFS_DEVICE_GETSET_FUNCS(name) \
229 static inline u64 \
230 btrfs_device_get_##name(const struct btrfs_device *dev) \
231 { \
232 u64 size; \
233 \
234 preempt_disable(); \
235 size = dev->name; \
236 preempt_enable(); \
237 return size; \
238 } \
239 \
240 static inline void \
241 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
242 { \
243 preempt_disable(); \
244 dev->name = size; \
245 preempt_enable(); \
246 }
247 #else
248 #define BTRFS_DEVICE_GETSET_FUNCS(name) \
249 static inline u64 \
250 btrfs_device_get_##name(const struct btrfs_device *dev) \
251 { \
252 return dev->name; \
253 } \
254 \
255 static inline void \
256 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
257 { \
258 dev->name = size; \
259 }
260 #endif
261
262 BTRFS_DEVICE_GETSET_FUNCS(total_bytes);
263 BTRFS_DEVICE_GETSET_FUNCS(disk_total_bytes);
264 BTRFS_DEVICE_GETSET_FUNCS(bytes_used);
265
266 enum btrfs_chunk_allocation_policy {
267 BTRFS_CHUNK_ALLOC_REGULAR,
268 BTRFS_CHUNK_ALLOC_ZONED,
269 };
270
271 /*
272 * Read policies for mirrored block group profiles, read picks the stripe based
273 * on these policies.
274 */
275 enum btrfs_read_policy {
276 /* Use process PID to choose the stripe */
277 BTRFS_READ_POLICY_PID,
278 BTRFS_NR_READ_POLICY,
279 };
280
281 struct btrfs_fs_devices {
282 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
283
284 /*
285 * UUID written into the btree blocks:
286 *
287 * - If metadata_uuid != fsid then super block must have
288 * BTRFS_FEATURE_INCOMPAT_METADATA_UUID flag set.
289 *
290 * - Following shall be true at all times:
291 * - metadata_uuid == btrfs_header::fsid
292 * - metadata_uuid == btrfs_dev_item::fsid
293 */
294 u8 metadata_uuid[BTRFS_FSID_SIZE];
295
296 struct list_head fs_list;
297
298 /*
299 * Number of devices under this fsid including missing and
300 * replace-target device and excludes seed devices.
301 */
302 u64 num_devices;
303
304 /*
305 * The number of devices that successfully opened, including
306 * replace-target, excludes seed devices.
307 */
308 u64 open_devices;
309
310 /* The number of devices that are under the chunk allocation list. */
311 u64 rw_devices;
312
313 /* Count of missing devices under this fsid excluding seed device. */
314 u64 missing_devices;
315 u64 total_rw_bytes;
316
317 /*
318 * Count of devices from btrfs_super_block::num_devices for this fsid,
319 * which includes the seed device, excludes the transient replace-target
320 * device.
321 */
322 u64 total_devices;
323
324 /* Highest generation number of seen devices */
325 u64 latest_generation;
326
327 /*
328 * The mount device or a device with highest generation after removal
329 * or replace.
330 */
331 struct btrfs_device *latest_dev;
332
333 /*
334 * All of the devices in the filesystem, protected by a mutex so we can
335 * safely walk it to write out the super blocks without worrying about
336 * adding/removing by the multi-device code. Scrubbing super block can
337 * kick off supers writing by holding this mutex lock.
338 */
339 struct mutex device_list_mutex;
340
341 /* List of all devices, protected by device_list_mutex */
342 struct list_head devices;
343
344 /* Devices which can satisfy space allocation. Protected by * chunk_mutex. */
345 struct list_head alloc_list;
346
347 struct list_head seed_list;
348
349 /* Count fs-devices opened. */
350 int opened;
351
352 /* Set when we find or add a device that doesn't have the nonrot flag set. */
353 bool rotating;
354 /* Devices support TRIM/discard commands. */
355 bool discardable;
356 bool fsid_change;
357 /* The filesystem is a seed filesystem. */
358 bool seeding;
359
360 struct btrfs_fs_info *fs_info;
361 /* sysfs kobjects */
362 struct kobject fsid_kobj;
363 struct kobject *devices_kobj;
364 struct kobject *devinfo_kobj;
365 struct completion kobj_unregister;
366
367 enum btrfs_chunk_allocation_policy chunk_alloc_policy;
368
369 /* Policy used to read the mirrored stripes. */
370 enum btrfs_read_policy read_policy;
371 };
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 struct btrfs_io_stripe {
383 struct btrfs_device *dev;
384 union {
385 /* Block mapping */
386 u64 physical;
387 /* For the endio handler */
388 struct btrfs_io_context *bioc;
389 };
390 };
391
392 struct btrfs_discard_stripe {
393 struct btrfs_device *dev;
394 u64 physical;
395 u64 length;
396 };
397
398 /*
399 * Context for IO subsmission for device stripe.
400 *
401 * - Track the unfinished mirrors for mirror based profiles
402 * Mirror based profiles are SINGLE/DUP/RAID1/RAID10.
403 *
404 * - Contain the logical -> physical mapping info
405 * Used by submit_stripe_bio() for mapping logical bio
406 * into physical device address.
407 *
408 * - Contain device replace info
409 * Used by handle_ops_on_dev_replace() to copy logical bios
410 * into the new device.
411 *
412 * - Contain RAID56 full stripe logical bytenrs
413 */
414 struct btrfs_io_context {
415 refcount_t refs;
416 struct btrfs_fs_info *fs_info;
417 u64 map_type; /* get from map_lookup->type */
418 struct bio *orig_bio;
419 atomic_t error;
420 u16 max_errors;
421
422 /*
423 * The total number of stripes, including the extra duplicated
424 * stripe for replace.
425 */
426 u16 num_stripes;
427
428 /*
429 * The mirror_num of this bioc.
430 *
431 * This is for reads which use 0 as mirror_num, thus we should return a
432 * valid mirror_num (>0) for the reader.
433 */
434 u16 mirror_num;
435
436 /*
437 * The following two members are for dev-replace case only.
438 *
439 * @replace_nr_stripes: Number of duplicated stripes which need to be
440 * written to replace target.
441 * Should be <= 2 (2 for DUP, otherwise <= 1).
442 * @replace_stripe_src: The array indicates where the duplicated stripes
443 * are from.
444 *
445 * The @replace_stripe_src[] array is mostly for RAID56 cases.
446 * As non-RAID56 stripes share the same contents of the mapped range,
447 * thus no need to bother where the duplicated ones are from.
448 *
449 * But for RAID56 case, all stripes contain different contents, thus
450 * we need a way to know the mapping.
451 *
452 * There is an example for the two members, using a RAID5 write:
453 *
454 * num_stripes: 4 (3 + 1 duplicated write)
455 * stripes[0]: dev = devid 1, physical = X
456 * stripes[1]: dev = devid 2, physical = Y
457 * stripes[2]: dev = devid 3, physical = Z
458 * stripes[3]: dev = devid 0, physical = Y
459 *
460 * replace_nr_stripes = 1
461 * replace_stripe_src = 1 <- Means stripes[1] is involved in replace.
462 * The duplicated stripe index would be
463 * (@num_stripes - 1).
464 *
465 * Note, that we can still have cases replace_nr_stripes = 2 for DUP.
466 * In that case, all stripes share the same content, thus we don't
467 * need to bother @replace_stripe_src value at all.
468 */
469 u16 replace_nr_stripes;
470 s16 replace_stripe_src;
471 /*
472 * Logical bytenr of the full stripe start, only for RAID56 cases.
473 *
474 * When this value is set to other than (u64)-1, the stripes[] should
475 * follow this pattern:
476 *
477 * (real_stripes = num_stripes - replace_nr_stripes)
478 * (data_stripes = (is_raid6) ? (real_stripes - 2) : (real_stripes - 1))
479 *
480 * stripes[0]: The first data stripe
481 * stripes[1]: The second data stripe
482 * ...
483 * stripes[data_stripes - 1]: The last data stripe
484 * stripes[data_stripes]: The P stripe
485 * stripes[data_stripes + 1]: The Q stripe (only for RAID6).
486 */
487 u64 full_stripe_logical;
488 struct btrfs_io_stripe stripes[];
489 };
490
491 struct btrfs_device_info {
492 struct btrfs_device *dev;
493 u64 dev_offset;
494 u64 max_avail;
495 u64 total_avail;
496 };
497
498 struct btrfs_raid_attr {
499 u8 sub_stripes; /* sub_stripes info for map */
500 u8 dev_stripes; /* stripes per dev */
501 u8 devs_max; /* max devs to use */
502 u8 devs_min; /* min devs needed */
503 u8 tolerated_failures; /* max tolerated fail devs */
504 u8 devs_increment; /* ndevs has to be a multiple of this */
505 u8 ncopies; /* how many copies to data has */
506 u8 nparity; /* number of stripes worth of bytes to store
507 * parity information */
508 u8 mindev_error; /* error code if min devs requisite is unmet */
509 const char raid_name[8]; /* name of the raid */
510 u64 bg_flag; /* block group flag of the raid */
511 };
512
513 extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES];
514
515 struct map_lookup {
516 u64 type;
517 int io_align;
518 int io_width;
519 int num_stripes;
520 int sub_stripes;
521 int verified_stripes; /* For mount time dev extent verification */
522 struct btrfs_io_stripe stripes[];
523 };
524
525 #define map_lookup_size(n) (sizeof(struct map_lookup) + \
526 (sizeof(struct btrfs_io_stripe) * (n)))
527
528 struct btrfs_balance_args;
529 struct btrfs_balance_progress;
530 struct btrfs_balance_control {
531 struct btrfs_balance_args data;
532 struct btrfs_balance_args meta;
533 struct btrfs_balance_args sys;
534
535 u64 flags;
536
537 struct btrfs_balance_progress stat;
538 };
539
540 /*
541 * Search for a given device by the set parameters
542 */
543 struct btrfs_dev_lookup_args {
544 u64 devid;
545 u8 *uuid;
546 u8 *fsid;
547 bool missing;
548 };
549
550 /* We have to initialize to -1 because BTRFS_DEV_REPLACE_DEVID is 0 */
551 #define BTRFS_DEV_LOOKUP_ARGS_INIT { .devid = (u64)-1 }
552
553 #define BTRFS_DEV_LOOKUP_ARGS(name) \
554 struct btrfs_dev_lookup_args name = BTRFS_DEV_LOOKUP_ARGS_INIT
555
556 enum btrfs_map_op {
557 BTRFS_MAP_READ,
558 BTRFS_MAP_WRITE,
559 BTRFS_MAP_GET_READ_MIRRORS,
560 };
561
btrfs_op(struct bio * bio)562 static inline enum btrfs_map_op btrfs_op(struct bio *bio)
563 {
564 switch (bio_op(bio)) {
565 case REQ_OP_WRITE:
566 case REQ_OP_ZONE_APPEND:
567 return BTRFS_MAP_WRITE;
568 default:
569 WARN_ON_ONCE(1);
570 fallthrough;
571 case REQ_OP_READ:
572 return BTRFS_MAP_READ;
573 }
574 }
575
btrfs_chunk_item_size(int num_stripes)576 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
577 {
578 ASSERT(num_stripes);
579 return sizeof(struct btrfs_chunk) +
580 sizeof(struct btrfs_stripe) * (num_stripes - 1);
581 }
582
583 /*
584 * Do the type safe converstion from stripe_nr to offset inside the chunk.
585 *
586 * @stripe_nr is u32, with left shift it can overflow u32 for chunks larger
587 * than 4G. This does the proper type cast to avoid overflow.
588 */
btrfs_stripe_nr_to_offset(u32 stripe_nr)589 static inline u64 btrfs_stripe_nr_to_offset(u32 stripe_nr)
590 {
591 return (u64)stripe_nr << BTRFS_STRIPE_LEN_SHIFT;
592 }
593
594 void btrfs_get_bioc(struct btrfs_io_context *bioc);
595 void btrfs_put_bioc(struct btrfs_io_context *bioc);
596 int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
597 u64 logical, u64 *length,
598 struct btrfs_io_context **bioc_ret,
599 struct btrfs_io_stripe *smap, int *mirror_num_ret,
600 int need_raid_map);
601 int btrfs_map_repair_block(struct btrfs_fs_info *fs_info,
602 struct btrfs_io_stripe *smap, u64 logical,
603 u32 length, int mirror_num);
604 struct btrfs_discard_stripe *btrfs_map_discard(struct btrfs_fs_info *fs_info,
605 u64 logical, u64 *length_ret,
606 u32 *num_stripes);
607 int btrfs_read_sys_array(struct btrfs_fs_info *fs_info);
608 int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info);
609 struct btrfs_block_group *btrfs_create_chunk(struct btrfs_trans_handle *trans,
610 u64 type);
611 void btrfs_mapping_tree_free(struct extent_map_tree *tree);
612 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
613 blk_mode_t flags, void *holder);
614 struct btrfs_device *btrfs_scan_one_device(const char *path, blk_mode_t flags);
615 int btrfs_forget_devices(dev_t devt);
616 void btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
617 void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices);
618 void btrfs_assign_next_active_device(struct btrfs_device *device,
619 struct btrfs_device *this_dev);
620 struct btrfs_device *btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info,
621 u64 devid,
622 const char *devpath);
623 int btrfs_get_dev_args_from_path(struct btrfs_fs_info *fs_info,
624 struct btrfs_dev_lookup_args *args,
625 const char *path);
626 struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
627 const u64 *devid, const u8 *uuid,
628 const char *path);
629 void btrfs_put_dev_args_from_path(struct btrfs_dev_lookup_args *args);
630 int btrfs_rm_device(struct btrfs_fs_info *fs_info,
631 struct btrfs_dev_lookup_args *args,
632 struct block_device **bdev, void **holder);
633 void __exit btrfs_cleanup_fs_uuids(void);
634 int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
635 int btrfs_grow_device(struct btrfs_trans_handle *trans,
636 struct btrfs_device *device, u64 new_size);
637 struct btrfs_device *btrfs_find_device(const struct btrfs_fs_devices *fs_devices,
638 const struct btrfs_dev_lookup_args *args);
639 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
640 int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *path);
641 int btrfs_balance(struct btrfs_fs_info *fs_info,
642 struct btrfs_balance_control *bctl,
643 struct btrfs_ioctl_balance_args *bargs);
644 void btrfs_describe_block_groups(u64 flags, char *buf, u32 size_buf);
645 int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
646 int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
647 int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
648 int btrfs_relocate_chunk(struct btrfs_fs_info *fs_info, u64 chunk_offset);
649 int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
650 int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
651 int btrfs_uuid_scan_kthread(void *data);
652 bool btrfs_chunk_writeable(struct btrfs_fs_info *fs_info, u64 chunk_offset);
653 void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
654 int btrfs_get_dev_stats(struct btrfs_fs_info *fs_info,
655 struct btrfs_ioctl_get_dev_stats *stats);
656 int btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
657 int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
658 int btrfs_run_dev_stats(struct btrfs_trans_handle *trans);
659 void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_device *srcdev);
660 void btrfs_rm_dev_replace_free_srcdev(struct btrfs_device *srcdev);
661 void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device *tgtdev);
662 int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info,
663 u64 logical, u64 len);
664 unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
665 u64 logical);
666 u64 btrfs_calc_stripe_length(const struct extent_map *em);
667 int btrfs_nr_parity_stripes(u64 type);
668 int btrfs_chunk_alloc_add_chunk_item(struct btrfs_trans_handle *trans,
669 struct btrfs_block_group *bg);
670 int btrfs_remove_chunk(struct btrfs_trans_handle *trans, u64 chunk_offset);
671 struct extent_map *btrfs_get_chunk_map(struct btrfs_fs_info *fs_info,
672 u64 logical, u64 length);
673 void btrfs_release_disk_super(struct btrfs_super_block *super);
674
btrfs_dev_stat_inc(struct btrfs_device * dev,int index)675 static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
676 int index)
677 {
678 atomic_inc(dev->dev_stat_values + index);
679 /*
680 * This memory barrier orders stores updating statistics before stores
681 * updating dev_stats_ccnt.
682 *
683 * It pairs with smp_rmb() in btrfs_run_dev_stats().
684 */
685 smp_mb__before_atomic();
686 atomic_inc(&dev->dev_stats_ccnt);
687 }
688
btrfs_dev_stat_read(struct btrfs_device * dev,int index)689 static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
690 int index)
691 {
692 return atomic_read(dev->dev_stat_values + index);
693 }
694
btrfs_dev_stat_read_and_reset(struct btrfs_device * dev,int index)695 static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
696 int index)
697 {
698 int ret;
699
700 ret = atomic_xchg(dev->dev_stat_values + index, 0);
701 /*
702 * atomic_xchg implies a full memory barriers as per atomic_t.txt:
703 * - RMW operations that have a return value are fully ordered;
704 *
705 * This implicit memory barriers is paired with the smp_rmb in
706 * btrfs_run_dev_stats
707 */
708 atomic_inc(&dev->dev_stats_ccnt);
709 return ret;
710 }
711
btrfs_dev_stat_set(struct btrfs_device * dev,int index,unsigned long val)712 static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
713 int index, unsigned long val)
714 {
715 atomic_set(dev->dev_stat_values + index, val);
716 /*
717 * This memory barrier orders stores updating statistics before stores
718 * updating dev_stats_ccnt.
719 *
720 * It pairs with smp_rmb() in btrfs_run_dev_stats().
721 */
722 smp_mb__before_atomic();
723 atomic_inc(&dev->dev_stats_ccnt);
724 }
725
btrfs_dev_name(const struct btrfs_device * device)726 static inline const char *btrfs_dev_name(const struct btrfs_device *device)
727 {
728 if (!device || test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state))
729 return "<missing disk>";
730 else
731 return rcu_str_deref(device->name);
732 }
733
734 void btrfs_commit_device_sizes(struct btrfs_transaction *trans);
735
736 struct list_head * __attribute_const__ btrfs_get_fs_uuids(void);
737 bool btrfs_check_rw_degradable(struct btrfs_fs_info *fs_info,
738 struct btrfs_device *failing_dev);
739 void btrfs_scratch_superblocks(struct btrfs_fs_info *fs_info,
740 struct block_device *bdev,
741 const char *device_path);
742
743 enum btrfs_raid_types __attribute_const__ btrfs_bg_flags_to_raid_index(u64 flags);
744 int btrfs_bg_type_to_factor(u64 flags);
745 const char *btrfs_bg_type_to_raid_name(u64 flags);
746 int btrfs_verify_dev_extents(struct btrfs_fs_info *fs_info);
747 bool btrfs_repair_one_zone(struct btrfs_fs_info *fs_info, u64 logical);
748
749 bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr);
750 u8 *btrfs_sb_fsid_ptr(struct btrfs_super_block *sb);
751
752 #endif
753