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
18extern 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
24static_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 */
35static_assert(const_ffs(BTRFS_BLOCK_GROUP_RAID0) <
36 const_ffs(BTRFS_BLOCK_GROUP_PROFILE_MASK & ~BTRFS_BLOCK_GROUP_RAID0));
37static_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
44enum 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
80struct btrfs_zoned_device_info;
81
82struct 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 bdev_handle *bdev_handle;
94 struct block_device *bdev;
95
96 struct btrfs_zoned_device_info *zone_info;
97
98 /*
99 * Device's major-minor number. Must be set even if the device is not
100 * opened (bdev == NULL), unless the device is missing.
101 */
102 dev_t devt;
103 unsigned long dev_state;
104 blk_status_t last_flush_error;
105
106#ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED
107 seqcount_t data_seqcount;
108#endif
109
110 /* the internal btrfs device id */
111 u64 devid;
112
113 /* size of the device in memory */
114 u64 total_bytes;
115
116 /* size of the device on disk */
117 u64 disk_total_bytes;
118
119 /* bytes used */
120 u64 bytes_used;
121
122 /* optimal io alignment for this device */
123 u32 io_align;
124
125 /* optimal io width for this device */
126 u32 io_width;
127 /* type and info about this device */
128 u64 type;
129
130 /* minimal io size for this device */
131 u32 sector_size;
132
133 /* physical drive uuid (or lvm uuid) */
134 u8 uuid[BTRFS_UUID_SIZE];
135
136 /*
137 * size of the device on the current transaction
138 *
139 * This variant is update when committing the transaction,
140 * and protected by chunk mutex
141 */
142 u64 commit_total_bytes;
143
144 /* bytes used on the current transaction */
145 u64 commit_bytes_used;
146
147 /* Bio used for flushing device barriers */
148 struct bio flush_bio;
149 struct completion flush_wait;
150
151 /* per-device scrub information */
152 struct scrub_ctx *scrub_ctx;
153
154 /* disk I/O failure stats. For detailed description refer to
155 * enum btrfs_dev_stat_values in ioctl.h */
156 int dev_stats_valid;
157
158 /* Counter to record the change of device stats */
159 atomic_t dev_stats_ccnt;
160 atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
161
162 struct extent_io_tree alloc_state;
163
164 struct completion kobj_unregister;
165 /* For sysfs/FSID/devinfo/devid/ */
166 struct kobject devid_kobj;
167
168 /* Bandwidth limit for scrub, in bytes */
169 u64 scrub_speed_max;
170};
171
172/*
173 * Block group or device which contains an active swapfile. Used for preventing
174 * unsafe operations while a swapfile is active.
175 *
176 * These are sorted on (ptr, inode) (note that a block group or device can
177 * contain more than one swapfile). We compare the pointer values because we
178 * don't actually care what the object is, we just need a quick check whether
179 * the object exists in the rbtree.
180 */
181struct btrfs_swapfile_pin {
182 struct rb_node node;
183 void *ptr;
184 struct inode *inode;
185 /*
186 * If true, ptr points to a struct btrfs_block_group. Otherwise, ptr
187 * points to a struct btrfs_device.
188 */
189 bool is_block_group;
190 /*
191 * Only used when 'is_block_group' is true and it is the number of
192 * extents used by a swapfile for this block group ('ptr' field).
193 */
194 int bg_extent_count;
195};
196
197/*
198 * If we read those variants at the context of their own lock, we needn't
199 * use the following helpers, reading them directly is safe.
200 */
201#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
202#define BTRFS_DEVICE_GETSET_FUNCS(name) \
203static inline u64 \
204btrfs_device_get_##name(const struct btrfs_device *dev) \
205{ \
206 u64 size; \
207 unsigned int seq; \
208 \
209 do { \
210 seq = read_seqcount_begin(&dev->data_seqcount); \
211 size = dev->name; \
212 } while (read_seqcount_retry(&dev->data_seqcount, seq)); \
213 return size; \
214} \
215 \
216static inline void \
217btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
218{ \
219 preempt_disable(); \
220 write_seqcount_begin(&dev->data_seqcount); \
221 dev->name = size; \
222 write_seqcount_end(&dev->data_seqcount); \
223 preempt_enable(); \
224}
225#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
226#define BTRFS_DEVICE_GETSET_FUNCS(name) \
227static inline u64 \
228btrfs_device_get_##name(const struct btrfs_device *dev) \
229{ \
230 u64 size; \
231 \
232 preempt_disable(); \
233 size = dev->name; \
234 preempt_enable(); \
235 return size; \
236} \
237 \
238static inline void \
239btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
240{ \
241 preempt_disable(); \
242 dev->name = size; \
243 preempt_enable(); \
244}
245#else
246#define BTRFS_DEVICE_GETSET_FUNCS(name) \
247static inline u64 \
248btrfs_device_get_##name(const struct btrfs_device *dev) \
249{ \
250 return dev->name; \
251} \
252 \
253static inline void \
254btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
255{ \
256 dev->name = size; \
257}
258#endif
259
260BTRFS_DEVICE_GETSET_FUNCS(total_bytes);
261BTRFS_DEVICE_GETSET_FUNCS(disk_total_bytes);
262BTRFS_DEVICE_GETSET_FUNCS(bytes_used);
263
264enum btrfs_chunk_allocation_policy {
265 BTRFS_CHUNK_ALLOC_REGULAR,
266 BTRFS_CHUNK_ALLOC_ZONED,
267};
268
269/*
270 * Read policies for mirrored block group profiles, read picks the stripe based
271 * on these policies.
272 */
273enum btrfs_read_policy {
274 /* Use process PID to choose the stripe */
275 BTRFS_READ_POLICY_PID,
276 BTRFS_NR_READ_POLICY,
277};
278
279struct btrfs_fs_devices {
280 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
281
282 /*
283 * UUID written into the btree blocks:
284 *
285 * - If metadata_uuid != fsid then super block must have
286 * BTRFS_FEATURE_INCOMPAT_METADATA_UUID flag set.
287 *
288 * - Following shall be true at all times:
289 * - metadata_uuid == btrfs_header::fsid
290 * - metadata_uuid == btrfs_dev_item::fsid
291 *
292 * - Relations between fsid and metadata_uuid in sb and fs_devices:
293 * - Normal:
294 * fs_devices->fsid == fs_devices->metadata_uuid == sb->fsid
295 * sb->metadata_uuid == 0
296 *
297 * - When the BTRFS_FEATURE_INCOMPAT_METADATA_UUID flag is set:
298 * fs_devices->fsid == sb->fsid
299 * fs_devices->metadata_uuid == sb->metadata_uuid
300 *
301 * - When in-memory fs_devices->temp_fsid is true
302 * fs_devices->fsid = random
303 * fs_devices->metadata_uuid == sb->fsid
304 */
305 u8 metadata_uuid[BTRFS_FSID_SIZE];
306
307 struct list_head fs_list;
308
309 /*
310 * Number of devices under this fsid including missing and
311 * replace-target device and excludes seed devices.
312 */
313 u64 num_devices;
314
315 /*
316 * The number of devices that successfully opened, including
317 * replace-target, excludes seed devices.
318 */
319 u64 open_devices;
320
321 /* The number of devices that are under the chunk allocation list. */
322 u64 rw_devices;
323
324 /* Count of missing devices under this fsid excluding seed device. */
325 u64 missing_devices;
326 u64 total_rw_bytes;
327
328 /*
329 * Count of devices from btrfs_super_block::num_devices for this fsid,
330 * which includes the seed device, excludes the transient replace-target
331 * device.
332 */
333 u64 total_devices;
334
335 /* Highest generation number of seen devices */
336 u64 latest_generation;
337
338 /*
339 * The mount device or a device with highest generation after removal
340 * or replace.
341 */
342 struct btrfs_device *latest_dev;
343
344 /*
345 * All of the devices in the filesystem, protected by a mutex so we can
346 * safely walk it to write out the super blocks without worrying about
347 * adding/removing by the multi-device code. Scrubbing super block can
348 * kick off supers writing by holding this mutex lock.
349 */
350 struct mutex device_list_mutex;
351
352 /* List of all devices, protected by device_list_mutex */
353 struct list_head devices;
354
355 /* Devices which can satisfy space allocation. Protected by * chunk_mutex. */
356 struct list_head alloc_list;
357
358 struct list_head seed_list;
359
360 /* Count fs-devices opened. */
361 int opened;
362
363 /* Set when we find or add a device that doesn't have the nonrot flag set. */
364 bool rotating;
365 /* Devices support TRIM/discard commands. */
366 bool discardable;
367 /* The filesystem is a seed filesystem. */
368 bool seeding;
369 /* The mount needs to use a randomly generated fsid. */
370 bool temp_fsid;
371
372 struct btrfs_fs_info *fs_info;
373 /* sysfs kobjects */
374 struct kobject fsid_kobj;
375 struct kobject *devices_kobj;
376 struct kobject *devinfo_kobj;
377 struct completion kobj_unregister;
378
379 enum btrfs_chunk_allocation_policy chunk_alloc_policy;
380
381 /* Policy used to read the mirrored stripes. */
382 enum btrfs_read_policy read_policy;
383};
384
385#define BTRFS_MAX_DEVS(info) ((BTRFS_MAX_ITEM_SIZE(info) \
386 - sizeof(struct btrfs_chunk)) \
387 / sizeof(struct btrfs_stripe) + 1)
388
389#define BTRFS_MAX_DEVS_SYS_CHUNK ((BTRFS_SYSTEM_CHUNK_ARRAY_SIZE \
390 - 2 * sizeof(struct btrfs_disk_key) \
391 - 2 * sizeof(struct btrfs_chunk)) \
392 / sizeof(struct btrfs_stripe) + 1)
393
394struct btrfs_io_stripe {
395 struct btrfs_device *dev;
396 /* Block mapping. */
397 u64 physical;
398 u64 length;
399 bool is_scrub;
400 /* For the endio handler. */
401 struct btrfs_io_context *bioc;
402};
403
404struct btrfs_discard_stripe {
405 struct btrfs_device *dev;
406 u64 physical;
407 u64 length;
408};
409
410/*
411 * Context for IO subsmission for device stripe.
412 *
413 * - Track the unfinished mirrors for mirror based profiles
414 * Mirror based profiles are SINGLE/DUP/RAID1/RAID10.
415 *
416 * - Contain the logical -> physical mapping info
417 * Used by submit_stripe_bio() for mapping logical bio
418 * into physical device address.
419 *
420 * - Contain device replace info
421 * Used by handle_ops_on_dev_replace() to copy logical bios
422 * into the new device.
423 *
424 * - Contain RAID56 full stripe logical bytenrs
425 */
426struct btrfs_io_context {
427 refcount_t refs;
428 struct btrfs_fs_info *fs_info;
429 u64 map_type; /* get from map_lookup->type */
430 struct bio *orig_bio;
431 atomic_t error;
432 u16 max_errors;
433
434 u64 logical;
435 u64 size;
436 /* Raid stripe tree ordered entry. */
437 struct list_head rst_ordered_entry;
438
439 /*
440 * The total number of stripes, including the extra duplicated
441 * stripe for replace.
442 */
443 u16 num_stripes;
444
445 /*
446 * The mirror_num of this bioc.
447 *
448 * This is for reads which use 0 as mirror_num, thus we should return a
449 * valid mirror_num (>0) for the reader.
450 */
451 u16 mirror_num;
452
453 /*
454 * The following two members are for dev-replace case only.
455 *
456 * @replace_nr_stripes: Number of duplicated stripes which need to be
457 * written to replace target.
458 * Should be <= 2 (2 for DUP, otherwise <= 1).
459 * @replace_stripe_src: The array indicates where the duplicated stripes
460 * are from.
461 *
462 * The @replace_stripe_src[] array is mostly for RAID56 cases.
463 * As non-RAID56 stripes share the same contents of the mapped range,
464 * thus no need to bother where the duplicated ones are from.
465 *
466 * But for RAID56 case, all stripes contain different contents, thus
467 * we need a way to know the mapping.
468 *
469 * There is an example for the two members, using a RAID5 write:
470 *
471 * num_stripes: 4 (3 + 1 duplicated write)
472 * stripes[0]: dev = devid 1, physical = X
473 * stripes[1]: dev = devid 2, physical = Y
474 * stripes[2]: dev = devid 3, physical = Z
475 * stripes[3]: dev = devid 0, physical = Y
476 *
477 * replace_nr_stripes = 1
478 * replace_stripe_src = 1 <- Means stripes[1] is involved in replace.
479 * The duplicated stripe index would be
480 * (@num_stripes - 1).
481 *
482 * Note, that we can still have cases replace_nr_stripes = 2 for DUP.
483 * In that case, all stripes share the same content, thus we don't
484 * need to bother @replace_stripe_src value at all.
485 */
486 u16 replace_nr_stripes;
487 s16 replace_stripe_src;
488 /*
489 * Logical bytenr of the full stripe start, only for RAID56 cases.
490 *
491 * When this value is set to other than (u64)-1, the stripes[] should
492 * follow this pattern:
493 *
494 * (real_stripes = num_stripes - replace_nr_stripes)
495 * (data_stripes = (is_raid6) ? (real_stripes - 2) : (real_stripes - 1))
496 *
497 * stripes[0]: The first data stripe
498 * stripes[1]: The second data stripe
499 * ...
500 * stripes[data_stripes - 1]: The last data stripe
501 * stripes[data_stripes]: The P stripe
502 * stripes[data_stripes + 1]: The Q stripe (only for RAID6).
503 */
504 u64 full_stripe_logical;
505 struct btrfs_io_stripe stripes[];
506};
507
508struct btrfs_device_info {
509 struct btrfs_device *dev;
510 u64 dev_offset;
511 u64 max_avail;
512 u64 total_avail;
513};
514
515struct btrfs_raid_attr {
516 u8 sub_stripes; /* sub_stripes info for map */
517 u8 dev_stripes; /* stripes per dev */
518 u8 devs_max; /* max devs to use */
519 u8 devs_min; /* min devs needed */
520 u8 tolerated_failures; /* max tolerated fail devs */
521 u8 devs_increment; /* ndevs has to be a multiple of this */
522 u8 ncopies; /* how many copies to data has */
523 u8 nparity; /* number of stripes worth of bytes to store
524 * parity information */
525 u8 mindev_error; /* error code if min devs requisite is unmet */
526 const char raid_name[8]; /* name of the raid */
527 u64 bg_flag; /* block group flag of the raid */
528};
529
530extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES];
531
532struct map_lookup {
533 u64 type;
534 int io_align;
535 int io_width;
536 int num_stripes;
537 int sub_stripes;
538 int verified_stripes; /* For mount time dev extent verification */
539 struct btrfs_io_stripe stripes[];
540};
541
542#define map_lookup_size(n) (sizeof(struct map_lookup) + \
543 (sizeof(struct btrfs_io_stripe) * (n)))
544
545struct btrfs_balance_args;
546struct btrfs_balance_progress;
547struct btrfs_balance_control {
548 struct btrfs_balance_args data;
549 struct btrfs_balance_args meta;
550 struct btrfs_balance_args sys;
551
552 u64 flags;
553
554 struct btrfs_balance_progress stat;
555};
556
557/*
558 * Search for a given device by the set parameters
559 */
560struct btrfs_dev_lookup_args {
561 u64 devid;
562 u8 *uuid;
563 u8 *fsid;
564 bool missing;
565};
566
567/* We have to initialize to -1 because BTRFS_DEV_REPLACE_DEVID is 0 */
568#define BTRFS_DEV_LOOKUP_ARGS_INIT { .devid = (u64)-1 }
569
570#define BTRFS_DEV_LOOKUP_ARGS(name) \
571 struct btrfs_dev_lookup_args name = BTRFS_DEV_LOOKUP_ARGS_INIT
572
573enum btrfs_map_op {
574 BTRFS_MAP_READ,
575 BTRFS_MAP_WRITE,
576 BTRFS_MAP_GET_READ_MIRRORS,
577};
578
579static inline enum btrfs_map_op btrfs_op(struct bio *bio)
580{
581 switch (bio_op(bio)) {
582 case REQ_OP_WRITE:
583 case REQ_OP_ZONE_APPEND:
584 return BTRFS_MAP_WRITE;
585 default:
586 WARN_ON_ONCE(1);
587 fallthrough;
588 case REQ_OP_READ:
589 return BTRFS_MAP_READ;
590 }
591}
592
593static inline unsigned long btrfs_chunk_item_size(int num_stripes)
594{
595 ASSERT(num_stripes);
596 return sizeof(struct btrfs_chunk) +
597 sizeof(struct btrfs_stripe) * (num_stripes - 1);
598}
599
600/*
601 * Do the type safe converstion from stripe_nr to offset inside the chunk.
602 *
603 * @stripe_nr is u32, with left shift it can overflow u32 for chunks larger
604 * than 4G. This does the proper type cast to avoid overflow.
605 */
606static inline u64 btrfs_stripe_nr_to_offset(u32 stripe_nr)
607{
608 return (u64)stripe_nr << BTRFS_STRIPE_LEN_SHIFT;
609}
610
611void btrfs_get_bioc(struct btrfs_io_context *bioc);
612void btrfs_put_bioc(struct btrfs_io_context *bioc);
613int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
614 u64 logical, u64 *length,
615 struct btrfs_io_context **bioc_ret,
616 struct btrfs_io_stripe *smap, int *mirror_num_ret);
617int btrfs_map_repair_block(struct btrfs_fs_info *fs_info,
618 struct btrfs_io_stripe *smap, u64 logical,
619 u32 length, int mirror_num);
620struct btrfs_discard_stripe *btrfs_map_discard(struct btrfs_fs_info *fs_info,
621 u64 logical, u64 *length_ret,
622 u32 *num_stripes);
623int btrfs_read_sys_array(struct btrfs_fs_info *fs_info);
624int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info);
625struct btrfs_block_group *btrfs_create_chunk(struct btrfs_trans_handle *trans,
626 u64 type);
627void btrfs_mapping_tree_free(struct extent_map_tree *tree);
628int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
629 blk_mode_t flags, void *holder);
630struct btrfs_device *btrfs_scan_one_device(const char *path, blk_mode_t flags,
631 bool mount_arg_dev);
632int btrfs_forget_devices(dev_t devt);
633void btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
634void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices);
635void btrfs_assign_next_active_device(struct btrfs_device *device,
636 struct btrfs_device *this_dev);
637struct btrfs_device *btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info,
638 u64 devid,
639 const char *devpath);
640int btrfs_get_dev_args_from_path(struct btrfs_fs_info *fs_info,
641 struct btrfs_dev_lookup_args *args,
642 const char *path);
643struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
644 const u64 *devid, const u8 *uuid,
645 const char *path);
646void btrfs_put_dev_args_from_path(struct btrfs_dev_lookup_args *args);
647int btrfs_rm_device(struct btrfs_fs_info *fs_info,
648 struct btrfs_dev_lookup_args *args,
649 struct bdev_handle **bdev_handle);
650void __exit btrfs_cleanup_fs_uuids(void);
651int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
652int btrfs_grow_device(struct btrfs_trans_handle *trans,
653 struct btrfs_device *device, u64 new_size);
654struct btrfs_device *btrfs_find_device(const struct btrfs_fs_devices *fs_devices,
655 const struct btrfs_dev_lookup_args *args);
656int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
657int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *path);
658int btrfs_balance(struct btrfs_fs_info *fs_info,
659 struct btrfs_balance_control *bctl,
660 struct btrfs_ioctl_balance_args *bargs);
661void btrfs_describe_block_groups(u64 flags, char *buf, u32 size_buf);
662int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
663int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
664int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
665int btrfs_relocate_chunk(struct btrfs_fs_info *fs_info, u64 chunk_offset);
666int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
667int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
668int btrfs_uuid_scan_kthread(void *data);
669bool btrfs_chunk_writeable(struct btrfs_fs_info *fs_info, u64 chunk_offset);
670void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
671int btrfs_get_dev_stats(struct btrfs_fs_info *fs_info,
672 struct btrfs_ioctl_get_dev_stats *stats);
673int btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
674int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
675int btrfs_run_dev_stats(struct btrfs_trans_handle *trans);
676void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_device *srcdev);
677void btrfs_rm_dev_replace_free_srcdev(struct btrfs_device *srcdev);
678void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device *tgtdev);
679int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info,
680 u64 logical, u64 len);
681unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
682 u64 logical);
683u64 btrfs_calc_stripe_length(const struct extent_map *em);
684int btrfs_nr_parity_stripes(u64 type);
685int btrfs_chunk_alloc_add_chunk_item(struct btrfs_trans_handle *trans,
686 struct btrfs_block_group *bg);
687int btrfs_remove_chunk(struct btrfs_trans_handle *trans, u64 chunk_offset);
688struct extent_map *btrfs_get_chunk_map(struct btrfs_fs_info *fs_info,
689 u64 logical, u64 length);
690void btrfs_release_disk_super(struct btrfs_super_block *super);
691
692static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
693 int index)
694{
695 atomic_inc(v: dev->dev_stat_values + index);
696 /*
697 * This memory barrier orders stores updating statistics before stores
698 * updating dev_stats_ccnt.
699 *
700 * It pairs with smp_rmb() in btrfs_run_dev_stats().
701 */
702 smp_mb__before_atomic();
703 atomic_inc(v: &dev->dev_stats_ccnt);
704}
705
706static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
707 int index)
708{
709 return atomic_read(v: dev->dev_stat_values + index);
710}
711
712static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
713 int index)
714{
715 int ret;
716
717 ret = atomic_xchg(v: dev->dev_stat_values + index, new: 0);
718 /*
719 * atomic_xchg implies a full memory barriers as per atomic_t.txt:
720 * - RMW operations that have a return value are fully ordered;
721 *
722 * This implicit memory barriers is paired with the smp_rmb in
723 * btrfs_run_dev_stats
724 */
725 atomic_inc(v: &dev->dev_stats_ccnt);
726 return ret;
727}
728
729static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
730 int index, unsigned long val)
731{
732 atomic_set(v: dev->dev_stat_values + index, i: val);
733 /*
734 * This memory barrier orders stores updating statistics before stores
735 * updating dev_stats_ccnt.
736 *
737 * It pairs with smp_rmb() in btrfs_run_dev_stats().
738 */
739 smp_mb__before_atomic();
740 atomic_inc(v: &dev->dev_stats_ccnt);
741}
742
743static inline const char *btrfs_dev_name(const struct btrfs_device *device)
744{
745 if (!device || test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state))
746 return "<missing disk>";
747 else
748 return rcu_str_deref(device->name);
749}
750
751void btrfs_commit_device_sizes(struct btrfs_transaction *trans);
752
753struct list_head * __attribute_const__ btrfs_get_fs_uuids(void);
754bool btrfs_check_rw_degradable(struct btrfs_fs_info *fs_info,
755 struct btrfs_device *failing_dev);
756void btrfs_scratch_superblocks(struct btrfs_fs_info *fs_info,
757 struct block_device *bdev,
758 const char *device_path);
759
760enum btrfs_raid_types __attribute_const__ btrfs_bg_flags_to_raid_index(u64 flags);
761int btrfs_bg_type_to_factor(u64 flags);
762const char *btrfs_bg_type_to_raid_name(u64 flags);
763int btrfs_verify_dev_extents(struct btrfs_fs_info *fs_info);
764bool btrfs_repair_one_zone(struct btrfs_fs_info *fs_info, u64 logical);
765
766bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr);
767u8 *btrfs_sb_fsid_ptr(struct btrfs_super_block *sb);
768
769#endif
770

source code of linux/fs/btrfs/volumes.h