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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 /* Taken from struct btrfs_chunk_map::type. */
430 u64 map_type;
431 struct bio *orig_bio;
432 atomic_t error;
433 u16 max_errors;
434
435 u64 logical;
436 u64 size;
437 /* Raid stripe tree ordered entry. */
438 struct list_head rst_ordered_entry;
439
440 /*
441 * The total number of stripes, including the extra duplicated
442 * stripe for replace.
443 */
444 u16 num_stripes;
445
446 /*
447 * The mirror_num of this bioc.
448 *
449 * This is for reads which use 0 as mirror_num, thus we should return a
450 * valid mirror_num (>0) for the reader.
451 */
452 u16 mirror_num;
453
454 /*
455 * The following two members are for dev-replace case only.
456 *
457 * @replace_nr_stripes: Number of duplicated stripes which need to be
458 * written to replace target.
459 * Should be <= 2 (2 for DUP, otherwise <= 1).
460 * @replace_stripe_src: The array indicates where the duplicated stripes
461 * are from.
462 *
463 * The @replace_stripe_src[] array is mostly for RAID56 cases.
464 * As non-RAID56 stripes share the same contents of the mapped range,
465 * thus no need to bother where the duplicated ones are from.
466 *
467 * But for RAID56 case, all stripes contain different contents, thus
468 * we need a way to know the mapping.
469 *
470 * There is an example for the two members, using a RAID5 write:
471 *
472 * num_stripes: 4 (3 + 1 duplicated write)
473 * stripes[0]: dev = devid 1, physical = X
474 * stripes[1]: dev = devid 2, physical = Y
475 * stripes[2]: dev = devid 3, physical = Z
476 * stripes[3]: dev = devid 0, physical = Y
477 *
478 * replace_nr_stripes = 1
479 * replace_stripe_src = 1 <- Means stripes[1] is involved in replace.
480 * The duplicated stripe index would be
481 * (@num_stripes - 1).
482 *
483 * Note, that we can still have cases replace_nr_stripes = 2 for DUP.
484 * In that case, all stripes share the same content, thus we don't
485 * need to bother @replace_stripe_src value at all.
486 */
487 u16 replace_nr_stripes;
488 s16 replace_stripe_src;
489 /*
490 * Logical bytenr of the full stripe start, only for RAID56 cases.
491 *
492 * When this value is set to other than (u64)-1, the stripes[] should
493 * follow this pattern:
494 *
495 * (real_stripes = num_stripes - replace_nr_stripes)
496 * (data_stripes = (is_raid6) ? (real_stripes - 2) : (real_stripes - 1))
497 *
498 * stripes[0]: The first data stripe
499 * stripes[1]: The second data stripe
500 * ...
501 * stripes[data_stripes - 1]: The last data stripe
502 * stripes[data_stripes]: The P stripe
503 * stripes[data_stripes + 1]: The Q stripe (only for RAID6).
504 */
505 u64 full_stripe_logical;
506 struct btrfs_io_stripe stripes[];
507};
508
509struct btrfs_device_info {
510 struct btrfs_device *dev;
511 u64 dev_offset;
512 u64 max_avail;
513 u64 total_avail;
514};
515
516struct btrfs_raid_attr {
517 u8 sub_stripes; /* sub_stripes info for map */
518 u8 dev_stripes; /* stripes per dev */
519 u8 devs_max; /* max devs to use */
520 u8 devs_min; /* min devs needed */
521 u8 tolerated_failures; /* max tolerated fail devs */
522 u8 devs_increment; /* ndevs has to be a multiple of this */
523 u8 ncopies; /* how many copies to data has */
524 u8 nparity; /* number of stripes worth of bytes to store
525 * parity information */
526 u8 mindev_error; /* error code if min devs requisite is unmet */
527 const char raid_name[8]; /* name of the raid */
528 u64 bg_flag; /* block group flag of the raid */
529};
530
531extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES];
532
533struct btrfs_chunk_map {
534 struct rb_node rb_node;
535 /* For mount time dev extent verification. */
536 int verified_stripes;
537 refcount_t refs;
538 u64 start;
539 u64 chunk_len;
540 u64 stripe_size;
541 u64 type;
542 int io_align;
543 int io_width;
544 int num_stripes;
545 int sub_stripes;
546 struct btrfs_io_stripe stripes[];
547};
548
549#define btrfs_chunk_map_size(n) (sizeof(struct btrfs_chunk_map) + \
550 (sizeof(struct btrfs_io_stripe) * (n)))
551
552static inline void btrfs_free_chunk_map(struct btrfs_chunk_map *map)
553{
554 if (map && refcount_dec_and_test(&map->refs)) {
555 ASSERT(RB_EMPTY_NODE(&map->rb_node));
556 kfree(map);
557 }
558}
559
560struct btrfs_balance_args;
561struct btrfs_balance_progress;
562struct btrfs_balance_control {
563 struct btrfs_balance_args data;
564 struct btrfs_balance_args meta;
565 struct btrfs_balance_args sys;
566
567 u64 flags;
568
569 struct btrfs_balance_progress stat;
570};
571
572/*
573 * Search for a given device by the set parameters
574 */
575struct btrfs_dev_lookup_args {
576 u64 devid;
577 u8 *uuid;
578 u8 *fsid;
579 bool missing;
580};
581
582/* We have to initialize to -1 because BTRFS_DEV_REPLACE_DEVID is 0 */
583#define BTRFS_DEV_LOOKUP_ARGS_INIT { .devid = (u64)-1 }
584
585#define BTRFS_DEV_LOOKUP_ARGS(name) \
586 struct btrfs_dev_lookup_args name = BTRFS_DEV_LOOKUP_ARGS_INIT
587
588enum btrfs_map_op {
589 BTRFS_MAP_READ,
590 BTRFS_MAP_WRITE,
591 BTRFS_MAP_GET_READ_MIRRORS,
592};
593
594static inline enum btrfs_map_op btrfs_op(struct bio *bio)
595{
596 switch (bio_op(bio)) {
597 case REQ_OP_WRITE:
598 case REQ_OP_ZONE_APPEND:
599 return BTRFS_MAP_WRITE;
600 default:
601 WARN_ON_ONCE(1);
602 fallthrough;
603 case REQ_OP_READ:
604 return BTRFS_MAP_READ;
605 }
606}
607
608static inline unsigned long btrfs_chunk_item_size(int num_stripes)
609{
610 ASSERT(num_stripes);
611 return sizeof(struct btrfs_chunk) +
612 sizeof(struct btrfs_stripe) * (num_stripes - 1);
613}
614
615/*
616 * Do the type safe conversion from stripe_nr to offset inside the chunk.
617 *
618 * @stripe_nr is u32, with left shift it can overflow u32 for chunks larger
619 * than 4G. This does the proper type cast to avoid overflow.
620 */
621static inline u64 btrfs_stripe_nr_to_offset(u32 stripe_nr)
622{
623 return (u64)stripe_nr << BTRFS_STRIPE_LEN_SHIFT;
624}
625
626void btrfs_get_bioc(struct btrfs_io_context *bioc);
627void btrfs_put_bioc(struct btrfs_io_context *bioc);
628int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
629 u64 logical, u64 *length,
630 struct btrfs_io_context **bioc_ret,
631 struct btrfs_io_stripe *smap, int *mirror_num_ret);
632int btrfs_map_repair_block(struct btrfs_fs_info *fs_info,
633 struct btrfs_io_stripe *smap, u64 logical,
634 u32 length, int mirror_num);
635struct btrfs_discard_stripe *btrfs_map_discard(struct btrfs_fs_info *fs_info,
636 u64 logical, u64 *length_ret,
637 u32 *num_stripes);
638int btrfs_read_sys_array(struct btrfs_fs_info *fs_info);
639int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info);
640struct btrfs_block_group *btrfs_create_chunk(struct btrfs_trans_handle *trans,
641 u64 type);
642void btrfs_mapping_tree_free(struct btrfs_fs_info *fs_info);
643int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
644 blk_mode_t flags, void *holder);
645struct btrfs_device *btrfs_scan_one_device(const char *path, blk_mode_t flags,
646 bool mount_arg_dev);
647int btrfs_forget_devices(dev_t devt);
648void btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
649void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices);
650void btrfs_assign_next_active_device(struct btrfs_device *device,
651 struct btrfs_device *this_dev);
652struct btrfs_device *btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info,
653 u64 devid,
654 const char *devpath);
655int btrfs_get_dev_args_from_path(struct btrfs_fs_info *fs_info,
656 struct btrfs_dev_lookup_args *args,
657 const char *path);
658struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
659 const u64 *devid, const u8 *uuid,
660 const char *path);
661void btrfs_put_dev_args_from_path(struct btrfs_dev_lookup_args *args);
662int btrfs_rm_device(struct btrfs_fs_info *fs_info,
663 struct btrfs_dev_lookup_args *args,
664 struct bdev_handle **bdev_handle);
665void __exit btrfs_cleanup_fs_uuids(void);
666int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
667int btrfs_grow_device(struct btrfs_trans_handle *trans,
668 struct btrfs_device *device, u64 new_size);
669struct btrfs_device *btrfs_find_device(const struct btrfs_fs_devices *fs_devices,
670 const struct btrfs_dev_lookup_args *args);
671int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
672int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *path);
673int btrfs_balance(struct btrfs_fs_info *fs_info,
674 struct btrfs_balance_control *bctl,
675 struct btrfs_ioctl_balance_args *bargs);
676void btrfs_describe_block_groups(u64 flags, char *buf, u32 size_buf);
677int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
678int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
679int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
680int btrfs_relocate_chunk(struct btrfs_fs_info *fs_info, u64 chunk_offset);
681int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
682int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
683int btrfs_uuid_scan_kthread(void *data);
684bool btrfs_chunk_writeable(struct btrfs_fs_info *fs_info, u64 chunk_offset);
685void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
686int btrfs_get_dev_stats(struct btrfs_fs_info *fs_info,
687 struct btrfs_ioctl_get_dev_stats *stats);
688int btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
689int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
690int btrfs_run_dev_stats(struct btrfs_trans_handle *trans);
691void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_device *srcdev);
692void btrfs_rm_dev_replace_free_srcdev(struct btrfs_device *srcdev);
693void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device *tgtdev);
694int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info,
695 u64 logical, u64 len);
696unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
697 u64 logical);
698u64 btrfs_calc_stripe_length(const struct btrfs_chunk_map *map);
699int btrfs_nr_parity_stripes(u64 type);
700int btrfs_chunk_alloc_add_chunk_item(struct btrfs_trans_handle *trans,
701 struct btrfs_block_group *bg);
702int btrfs_remove_chunk(struct btrfs_trans_handle *trans, u64 chunk_offset);
703
704#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
705struct btrfs_chunk_map *btrfs_alloc_chunk_map(int num_stripes, gfp_t gfp);
706int btrfs_add_chunk_map(struct btrfs_fs_info *fs_info, struct btrfs_chunk_map *map);
707#endif
708
709struct btrfs_chunk_map *btrfs_clone_chunk_map(struct btrfs_chunk_map *map, gfp_t gfp);
710struct btrfs_chunk_map *btrfs_find_chunk_map(struct btrfs_fs_info *fs_info,
711 u64 logical, u64 length);
712struct btrfs_chunk_map *btrfs_find_chunk_map_nolock(struct btrfs_fs_info *fs_info,
713 u64 logical, u64 length);
714struct btrfs_chunk_map *btrfs_get_chunk_map(struct btrfs_fs_info *fs_info,
715 u64 logical, u64 length);
716void btrfs_remove_chunk_map(struct btrfs_fs_info *fs_info, struct btrfs_chunk_map *map);
717void btrfs_release_disk_super(struct btrfs_super_block *super);
718
719static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
720 int index)
721{
722 atomic_inc(dev->dev_stat_values + index);
723 /*
724 * This memory barrier orders stores updating statistics before stores
725 * updating dev_stats_ccnt.
726 *
727 * It pairs with smp_rmb() in btrfs_run_dev_stats().
728 */
729 smp_mb__before_atomic();
730 atomic_inc(&dev->dev_stats_ccnt);
731}
732
733static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
734 int index)
735{
736 return atomic_read(dev->dev_stat_values + index);
737}
738
739static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
740 int index)
741{
742 int ret;
743
744 ret = atomic_xchg(dev->dev_stat_values + index, 0);
745 /*
746 * atomic_xchg implies a full memory barriers as per atomic_t.txt:
747 * - RMW operations that have a return value are fully ordered;
748 *
749 * This implicit memory barriers is paired with the smp_rmb in
750 * btrfs_run_dev_stats
751 */
752 atomic_inc(&dev->dev_stats_ccnt);
753 return ret;
754}
755
756static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
757 int index, unsigned long val)
758{
759 atomic_set(dev->dev_stat_values + index, val);
760 /*
761 * This memory barrier orders stores updating statistics before stores
762 * updating dev_stats_ccnt.
763 *
764 * It pairs with smp_rmb() in btrfs_run_dev_stats().
765 */
766 smp_mb__before_atomic();
767 atomic_inc(&dev->dev_stats_ccnt);
768}
769
770static inline const char *btrfs_dev_name(const struct btrfs_device *device)
771{
772 if (!device || test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state))
773 return "<missing disk>";
774 else
775 return rcu_str_deref(device->name);
776}
777
778void btrfs_commit_device_sizes(struct btrfs_transaction *trans);
779
780struct list_head * __attribute_const__ btrfs_get_fs_uuids(void);
781bool btrfs_check_rw_degradable(struct btrfs_fs_info *fs_info,
782 struct btrfs_device *failing_dev);
783void btrfs_scratch_superblocks(struct btrfs_fs_info *fs_info,
784 struct block_device *bdev,
785 const char *device_path);
786
787enum btrfs_raid_types __attribute_const__ btrfs_bg_flags_to_raid_index(u64 flags);
788int btrfs_bg_type_to_factor(u64 flags);
789const char *btrfs_bg_type_to_raid_name(u64 flags);
790int btrfs_verify_dev_extents(struct btrfs_fs_info *fs_info);
791bool btrfs_repair_one_zone(struct btrfs_fs_info *fs_info, u64 logical);
792
793bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr);
794u8 *btrfs_sb_fsid_ptr(struct btrfs_super_block *sb);
795
796#endif
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
16extern struct mutex uuid_mutex;
17
18#define BTRFS_STRIPE_LEN SZ_64K
19
20struct btrfs_io_geometry {
21 /* remaining bytes before crossing a stripe */
22 u64 len;
23 /* offset of logical address in chunk */
24 u64 offset;
25 /* length of single IO stripe */
26 u64 stripe_len;
27 /* number of stripe where address falls */
28 u64 stripe_nr;
29 /* offset of address in stripe */
30 u64 stripe_offset;
31 /* offset of raid56 stripe into the chunk */
32 u64 raid56_stripe_offset;
33};
34
35/*
36 * Use sequence counter to get consistent device stat data on
37 * 32-bit processors.
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
54struct btrfs_device {
55 struct list_head dev_list; /* device_list_mutex */
56 struct list_head dev_alloc_list; /* chunk mutex */
57 struct list_head post_commit_list; /* chunk mutex */
58 struct btrfs_fs_devices *fs_devices;
59 struct btrfs_fs_info *fs_info;
60
61 struct rcu_string *name;
62
63 u64 generation;
64
65 struct block_device *bdev;
66
67 /* the mode sent to blkdev_get */
68 fmode_t mode;
69
70 unsigned long dev_state;
71 blk_status_t last_flush_error;
72
73#ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED
74 seqcount_t data_seqcount;
75#endif
76
77 /* the internal btrfs device id */
78 u64 devid;
79
80 /* size of the device in memory */
81 u64 total_bytes;
82
83 /* size of the device on disk */
84 u64 disk_total_bytes;
85
86 /* bytes used */
87 u64 bytes_used;
88
89 /* optimal io alignment for this device */
90 u32 io_align;
91
92 /* optimal io width for this device */
93 u32 io_width;
94 /* type and info about this device */
95 u64 type;
96
97 /* minimal io size for this device */
98 u32 sector_size;
99
100 /* physical drive uuid (or lvm uuid) */
101 u8 uuid[BTRFS_UUID_SIZE];
102
103 /*
104 * size of the device on the current transaction
105 *
106 * This variant is update when committing the transaction,
107 * and protected by chunk mutex
108 */
109 u64 commit_total_bytes;
110
111 /* bytes used on the current transaction */
112 u64 commit_bytes_used;
113
114 /* for sending down flush barriers */
115 struct bio *flush_bio;
116 struct completion flush_wait;
117
118 /* per-device scrub information */
119 struct scrub_ctx *scrub_ctx;
120
121 /* readahead state */
122 atomic_t reada_in_flight;
123 u64 reada_next;
124 struct reada_zone *reada_curr_zone;
125 struct radix_tree_root reada_zones;
126 struct radix_tree_root reada_extents;
127
128 /* disk I/O failure stats. For detailed description refer to
129 * enum btrfs_dev_stat_values in ioctl.h */
130 int dev_stats_valid;
131
132 /* Counter to record the change of device stats */
133 atomic_t dev_stats_ccnt;
134 atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
135
136 struct extent_io_tree alloc_state;
137
138 struct completion kobj_unregister;
139 /* For sysfs/FSID/devinfo/devid/ */
140 struct kobject devid_kobj;
141};
142
143/*
144 * If we read those variants at the context of their own lock, we needn't
145 * use the following helpers, reading them directly is safe.
146 */
147#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
148#define BTRFS_DEVICE_GETSET_FUNCS(name) \
149static inline u64 \
150btrfs_device_get_##name(const struct btrfs_device *dev) \
151{ \
152 u64 size; \
153 unsigned int seq; \
154 \
155 do { \
156 seq = read_seqcount_begin(&dev->data_seqcount); \
157 size = dev->name; \
158 } while (read_seqcount_retry(&dev->data_seqcount, seq)); \
159 return size; \
160} \
161 \
162static inline void \
163btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
164{ \
165 preempt_disable(); \
166 write_seqcount_begin(&dev->data_seqcount); \
167 dev->name = size; \
168 write_seqcount_end(&dev->data_seqcount); \
169 preempt_enable(); \
170}
171#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
172#define BTRFS_DEVICE_GETSET_FUNCS(name) \
173static inline u64 \
174btrfs_device_get_##name(const struct btrfs_device *dev) \
175{ \
176 u64 size; \
177 \
178 preempt_disable(); \
179 size = dev->name; \
180 preempt_enable(); \
181 return size; \
182} \
183 \
184static inline void \
185btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
186{ \
187 preempt_disable(); \
188 dev->name = size; \
189 preempt_enable(); \
190}
191#else
192#define BTRFS_DEVICE_GETSET_FUNCS(name) \
193static inline u64 \
194btrfs_device_get_##name(const struct btrfs_device *dev) \
195{ \
196 return dev->name; \
197} \
198 \
199static inline void \
200btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
201{ \
202 dev->name = size; \
203}
204#endif
205
206BTRFS_DEVICE_GETSET_FUNCS(total_bytes);
207BTRFS_DEVICE_GETSET_FUNCS(disk_total_bytes);
208BTRFS_DEVICE_GETSET_FUNCS(bytes_used);
209
210enum btrfs_chunk_allocation_policy {
211 BTRFS_CHUNK_ALLOC_REGULAR,
212};
213
214struct btrfs_fs_devices {
215 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
216 u8 metadata_uuid[BTRFS_FSID_SIZE];
217 bool fsid_change;
218 struct list_head fs_list;
219
220 u64 num_devices;
221 u64 open_devices;
222 u64 rw_devices;
223 u64 missing_devices;
224 u64 total_rw_bytes;
225 u64 total_devices;
226
227 /* Highest generation number of seen devices */
228 u64 latest_generation;
229
230 struct block_device *latest_bdev;
231
232 /* all of the devices in the FS, protected by a mutex
233 * so we can safely walk it to write out the supers without
234 * worrying about add/remove by the multi-device code.
235 * Scrubbing super can kick off supers writing by holding
236 * this mutex lock.
237 */
238 struct mutex device_list_mutex;
239
240 /* List of all devices, protected by device_list_mutex */
241 struct list_head devices;
242
243 /*
244 * Devices which can satisfy space allocation. Protected by
245 * chunk_mutex
246 */
247 struct list_head alloc_list;
248
249 struct btrfs_fs_devices *seed;
250 bool seeding;
251
252 int opened;
253
254 /* set when we find or add a device that doesn't have the
255 * nonrot flag set
256 */
257 bool rotating;
258
259 struct btrfs_fs_info *fs_info;
260 /* sysfs kobjects */
261 struct kobject fsid_kobj;
262 struct kobject *devices_kobj;
263 struct kobject *devinfo_kobj;
264 struct completion kobj_unregister;
265
266 enum btrfs_chunk_allocation_policy chunk_alloc_policy;
267};
268
269#define BTRFS_BIO_INLINE_CSUM_SIZE 64
270
271#define BTRFS_MAX_DEVS(info) ((BTRFS_MAX_ITEM_SIZE(info) \
272 - sizeof(struct btrfs_chunk)) \
273 / sizeof(struct btrfs_stripe) + 1)
274
275#define BTRFS_MAX_DEVS_SYS_CHUNK ((BTRFS_SYSTEM_CHUNK_ARRAY_SIZE \
276 - 2 * sizeof(struct btrfs_disk_key) \
277 - 2 * sizeof(struct btrfs_chunk)) \
278 / sizeof(struct btrfs_stripe) + 1)
279
280/*
281 * we need the mirror number and stripe index to be passed around
282 * the call chain while we are processing end_io (especially errors).
283 * Really, what we need is a btrfs_bio structure that has this info
284 * and is properly sized with its stripe array, but we're not there
285 * quite yet. We have our own btrfs bioset, and all of the bios
286 * we allocate are actually btrfs_io_bios. We'll cram as much of
287 * struct btrfs_bio as we can into this over time.
288 */
289struct btrfs_io_bio {
290 unsigned int mirror_num;
291 struct btrfs_device *device;
292 u64 logical;
293 u8 *csum;
294 u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
295 struct bvec_iter iter;
296 /*
297 * This member must come last, bio_alloc_bioset will allocate enough
298 * bytes for entire btrfs_io_bio but relies on bio being last.
299 */
300 struct bio bio;
301};
302
303static inline struct btrfs_io_bio *btrfs_io_bio(struct bio *bio)
304{
305 return container_of(bio, struct btrfs_io_bio, bio);
306}
307
308static inline void btrfs_io_bio_free_csum(struct btrfs_io_bio *io_bio)
309{
310 if (io_bio->csum != io_bio->csum_inline) {
311 kfree(io_bio->csum);
312 io_bio->csum = NULL;
313 }
314}
315
316struct btrfs_bio_stripe {
317 struct btrfs_device *dev;
318 u64 physical;
319 u64 length; /* only used for discard mappings */
320};
321
322struct btrfs_bio {
323 refcount_t refs;
324 atomic_t stripes_pending;
325 struct btrfs_fs_info *fs_info;
326 u64 map_type; /* get from map_lookup->type */
327 bio_end_io_t *end_io;
328 struct bio *orig_bio;
329 void *private;
330 atomic_t error;
331 int max_errors;
332 int num_stripes;
333 int mirror_num;
334 int num_tgtdevs;
335 int *tgtdev_map;
336 /*
337 * logical block numbers for the start of each stripe
338 * The last one or two are p/q. These are sorted,
339 * so raid_map[0] is the start of our full stripe
340 */
341 u64 *raid_map;
342 struct btrfs_bio_stripe stripes[];
343};
344
345struct btrfs_device_info {
346 struct btrfs_device *dev;
347 u64 dev_offset;
348 u64 max_avail;
349 u64 total_avail;
350};
351
352struct btrfs_raid_attr {
353 u8 sub_stripes; /* sub_stripes info for map */
354 u8 dev_stripes; /* stripes per dev */
355 u8 devs_max; /* max devs to use */
356 u8 devs_min; /* min devs needed */
357 u8 tolerated_failures; /* max tolerated fail devs */
358 u8 devs_increment; /* ndevs has to be a multiple of this */
359 u8 ncopies; /* how many copies to data has */
360 u8 nparity; /* number of stripes worth of bytes to store
361 * parity information */
362 u8 mindev_error; /* error code if min devs requisite is unmet */
363 const char raid_name[8]; /* name of the raid */
364 u64 bg_flag; /* block group flag of the raid */
365};
366
367extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES];
368
369struct map_lookup {
370 u64 type;
371 int io_align;
372 int io_width;
373 u64 stripe_len;
374 int num_stripes;
375 int sub_stripes;
376 int verified_stripes; /* For mount time dev extent verification */
377 struct btrfs_bio_stripe stripes[];
378};
379
380#define map_lookup_size(n) (sizeof(struct map_lookup) + \
381 (sizeof(struct btrfs_bio_stripe) * (n)))
382
383struct btrfs_balance_args;
384struct btrfs_balance_progress;
385struct btrfs_balance_control {
386 struct btrfs_balance_args data;
387 struct btrfs_balance_args meta;
388 struct btrfs_balance_args sys;
389
390 u64 flags;
391
392 struct btrfs_balance_progress stat;
393};
394
395enum btrfs_map_op {
396 BTRFS_MAP_READ,
397 BTRFS_MAP_WRITE,
398 BTRFS_MAP_DISCARD,
399 BTRFS_MAP_GET_READ_MIRRORS,
400};
401
402static inline enum btrfs_map_op btrfs_op(struct bio *bio)
403{
404 switch (bio_op(bio)) {
405 case REQ_OP_DISCARD:
406 return BTRFS_MAP_DISCARD;
407 case REQ_OP_WRITE:
408 return BTRFS_MAP_WRITE;
409 default:
410 WARN_ON_ONCE(1);
411 fallthrough;
412 case REQ_OP_READ:
413 return BTRFS_MAP_READ;
414 }
415}
416
417void btrfs_get_bbio(struct btrfs_bio *bbio);
418void btrfs_put_bbio(struct btrfs_bio *bbio);
419int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
420 u64 logical, u64 *length,
421 struct btrfs_bio **bbio_ret, int mirror_num);
422int btrfs_map_sblock(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
423 u64 logical, u64 *length,
424 struct btrfs_bio **bbio_ret);
425int btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
426 u64 logical, u64 len, struct btrfs_io_geometry *io_geom);
427int btrfs_read_sys_array(struct btrfs_fs_info *fs_info);
428int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info);
429int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, u64 type);
430void btrfs_mapping_tree_free(struct extent_map_tree *tree);
431blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
432 int mirror_num);
433int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
434 fmode_t flags, void *holder);
435struct btrfs_device *btrfs_scan_one_device(const char *path,
436 fmode_t flags, void *holder);
437int btrfs_forget_devices(const char *path);
438int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
439void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices, int step);
440void btrfs_assign_next_active_device(struct btrfs_device *device,
441 struct btrfs_device *this_dev);
442struct btrfs_device *btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info,
443 u64 devid,
444 const char *devpath);
445struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
446 const u64 *devid,
447 const u8 *uuid);
448void btrfs_free_device(struct btrfs_device *device);
449int btrfs_rm_device(struct btrfs_fs_info *fs_info,
450 const char *device_path, u64 devid);
451void __exit btrfs_cleanup_fs_uuids(void);
452int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
453int btrfs_grow_device(struct btrfs_trans_handle *trans,
454 struct btrfs_device *device, u64 new_size);
455struct btrfs_device *btrfs_find_device(struct btrfs_fs_devices *fs_devices,
456 u64 devid, u8 *uuid, u8 *fsid, bool seed);
457int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
458int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *path);
459int btrfs_balance(struct btrfs_fs_info *fs_info,
460 struct btrfs_balance_control *bctl,
461 struct btrfs_ioctl_balance_args *bargs);
462void btrfs_describe_block_groups(u64 flags, char *buf, u32 size_buf);
463int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
464int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
465int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
466int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
467int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
468int btrfs_uuid_scan_kthread(void *data);
469int btrfs_chunk_readonly(struct btrfs_fs_info *fs_info, u64 chunk_offset);
470int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes,
471 u64 *start, u64 *max_avail);
472void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
473int btrfs_get_dev_stats(struct btrfs_fs_info *fs_info,
474 struct btrfs_ioctl_get_dev_stats *stats);
475void btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
476int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
477int btrfs_run_dev_stats(struct btrfs_trans_handle *trans);
478void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_device *srcdev);
479void btrfs_rm_dev_replace_free_srcdev(struct btrfs_device *srcdev);
480void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device *tgtdev);
481int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info,
482 u64 logical, u64 len);
483unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
484 u64 logical);
485int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
486 u64 chunk_offset, u64 chunk_size);
487int btrfs_remove_chunk(struct btrfs_trans_handle *trans, u64 chunk_offset);
488struct extent_map *btrfs_get_chunk_map(struct btrfs_fs_info *fs_info,
489 u64 logical, u64 length);
490void btrfs_release_disk_super(struct btrfs_super_block *super);
491
492static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
493 int index)
494{
495 atomic_inc(dev->dev_stat_values + index);
496 /*
497 * This memory barrier orders stores updating statistics before stores
498 * updating dev_stats_ccnt.
499 *
500 * It pairs with smp_rmb() in btrfs_run_dev_stats().
501 */
502 smp_mb__before_atomic();
503 atomic_inc(&dev->dev_stats_ccnt);
504}
505
506static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
507 int index)
508{
509 return atomic_read(dev->dev_stat_values + index);
510}
511
512static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
513 int index)
514{
515 int ret;
516
517 ret = atomic_xchg(dev->dev_stat_values + index, 0);
518 /*
519 * atomic_xchg implies a full memory barriers as per atomic_t.txt:
520 * - RMW operations that have a return value are fully ordered;
521 *
522 * This implicit memory barriers is paired with the smp_rmb in
523 * btrfs_run_dev_stats
524 */
525 atomic_inc(&dev->dev_stats_ccnt);
526 return ret;
527}
528
529static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
530 int index, unsigned long val)
531{
532 atomic_set(dev->dev_stat_values + index, val);
533 /*
534 * This memory barrier orders stores updating statistics before stores
535 * updating dev_stats_ccnt.
536 *
537 * It pairs with smp_rmb() in btrfs_run_dev_stats().
538 */
539 smp_mb__before_atomic();
540 atomic_inc(&dev->dev_stats_ccnt);
541}
542
543/*
544 * Convert block group flags (BTRFS_BLOCK_GROUP_*) to btrfs_raid_types, which
545 * can be used as index to access btrfs_raid_array[].
546 */
547static inline enum btrfs_raid_types btrfs_bg_flags_to_raid_index(u64 flags)
548{
549 if (flags & BTRFS_BLOCK_GROUP_RAID10)
550 return BTRFS_RAID_RAID10;
551 else if (flags & BTRFS_BLOCK_GROUP_RAID1)
552 return BTRFS_RAID_RAID1;
553 else if (flags & BTRFS_BLOCK_GROUP_RAID1C3)
554 return BTRFS_RAID_RAID1C3;
555 else if (flags & BTRFS_BLOCK_GROUP_RAID1C4)
556 return BTRFS_RAID_RAID1C4;
557 else if (flags & BTRFS_BLOCK_GROUP_DUP)
558 return BTRFS_RAID_DUP;
559 else if (flags & BTRFS_BLOCK_GROUP_RAID0)
560 return BTRFS_RAID_RAID0;
561 else if (flags & BTRFS_BLOCK_GROUP_RAID5)
562 return BTRFS_RAID_RAID5;
563 else if (flags & BTRFS_BLOCK_GROUP_RAID6)
564 return BTRFS_RAID_RAID6;
565
566 return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */
567}
568
569void btrfs_commit_device_sizes(struct btrfs_transaction *trans);
570
571struct list_head * __attribute_const__ btrfs_get_fs_uuids(void);
572void btrfs_set_fs_info_ptr(struct btrfs_fs_info *fs_info);
573void btrfs_reset_fs_info_ptr(struct btrfs_fs_info *fs_info);
574bool btrfs_check_rw_degradable(struct btrfs_fs_info *fs_info,
575 struct btrfs_device *failing_dev);
576void btrfs_scratch_superblocks(struct btrfs_fs_info *fs_info,
577 struct block_device *bdev,
578 const char *device_path);
579
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);
583
584#endif