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/blk_types.h>
10 #include <linux/sizes.h>
11 #include <linux/atomic.h>
12 #include <linux/sort.h>
13 #include <linux/list.h>
14 #include <linux/mutex.h>
15 #include <linux/log2.h>
16 #include <linux/kobject.h>
17 #include <linux/refcount.h>
18 #include <linux/completion.h>
19 #include <linux/rbtree.h>
20 #include <uapi/linux/btrfs.h>
21 #include "messages.h"
22 #include "rcu-string.h"
23
24 struct block_device;
25 struct bdev_handle;
26 struct btrfs_fs_info;
27 struct btrfs_block_group;
28 struct btrfs_trans_handle;
29 struct btrfs_zoned_device_info;
30
31 #define BTRFS_MAX_DATA_CHUNK_SIZE (10ULL * SZ_1G)
32
33 extern struct mutex uuid_mutex;
34
35 #define BTRFS_STRIPE_LEN SZ_64K
36 #define BTRFS_STRIPE_LEN_SHIFT (16)
37 #define BTRFS_STRIPE_LEN_MASK (BTRFS_STRIPE_LEN - 1)
38
39 static_assert(const_ilog2(BTRFS_STRIPE_LEN) == BTRFS_STRIPE_LEN_SHIFT);
40
41 /* Used by sanity check for btrfs_raid_types. */
42 #define const_ffs(n) (__builtin_ctzll(n) + 1)
43
44 /*
45 * The conversion from BTRFS_BLOCK_GROUP_* bits to btrfs_raid_type requires
46 * RAID0 always to be the lowest profile bit.
47 * Although it's part of on-disk format and should never change, do extra
48 * compile-time sanity checks.
49 */
50 static_assert(const_ffs(BTRFS_BLOCK_GROUP_RAID0) <
51 const_ffs(BTRFS_BLOCK_GROUP_PROFILE_MASK & ~BTRFS_BLOCK_GROUP_RAID0));
52 static_assert(const_ilog2(BTRFS_BLOCK_GROUP_RAID0) >
53 ilog2(BTRFS_BLOCK_GROUP_TYPE_MASK));
54
55 /* ilog2() can handle both constants and variables */
56 #define BTRFS_BG_FLAG_TO_INDEX(profile) \
57 ilog2((profile) >> (ilog2(BTRFS_BLOCK_GROUP_RAID0) - 1))
58
59 enum btrfs_raid_types {
60 /* SINGLE is the special one as it doesn't have on-disk bit. */
61 BTRFS_RAID_SINGLE = 0,
62
63 BTRFS_RAID_RAID0 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID0),
64 BTRFS_RAID_RAID1 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1),
65 BTRFS_RAID_DUP = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_DUP),
66 BTRFS_RAID_RAID10 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID10),
67 BTRFS_RAID_RAID5 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID5),
68 BTRFS_RAID_RAID6 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID6),
69 BTRFS_RAID_RAID1C3 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1C3),
70 BTRFS_RAID_RAID1C4 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1C4),
71
72 BTRFS_NR_RAID_TYPES
73 };
74
75 /*
76 * Use sequence counter to get consistent device stat data on
77 * 32-bit processors.
78 */
79 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
80 #include <linux/seqlock.h>
81 #define __BTRFS_NEED_DEVICE_DATA_ORDERED
82 #define btrfs_device_data_ordered_init(device) \
83 seqcount_init(&device->data_seqcount)
84 #else
85 #define btrfs_device_data_ordered_init(device) do { } while (0)
86 #endif
87
88 #define BTRFS_DEV_STATE_WRITEABLE (0)
89 #define BTRFS_DEV_STATE_IN_FS_METADATA (1)
90 #define BTRFS_DEV_STATE_MISSING (2)
91 #define BTRFS_DEV_STATE_REPLACE_TGT (3)
92 #define BTRFS_DEV_STATE_FLUSH_SENT (4)
93 #define BTRFS_DEV_STATE_NO_READA (5)
94
95 /* Special value encoding failure to write primary super block. */
96 #define BTRFS_SUPER_PRIMARY_WRITE_ERROR (INT_MAX / 2)
97
98 struct btrfs_fs_devices;
99
100 struct btrfs_device {
101 struct list_head dev_list; /* device_list_mutex */
102 struct list_head dev_alloc_list; /* chunk mutex */
103 struct list_head post_commit_list; /* chunk mutex */
104 struct btrfs_fs_devices *fs_devices;
105 struct btrfs_fs_info *fs_info;
106
107 struct rcu_string __rcu *name;
108
109 u64 generation;
110
111 struct file *bdev_file;
112 struct block_device *bdev;
113
114 struct btrfs_zoned_device_info *zone_info;
115
116 /*
117 * Device's major-minor number. Must be set even if the device is not
118 * opened (bdev == NULL), unless the device is missing.
119 */
120 dev_t devt;
121 unsigned long dev_state;
122 blk_status_t last_flush_error;
123
124 #ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED
125 seqcount_t data_seqcount;
126 #endif
127
128 /* the internal btrfs device id */
129 u64 devid;
130
131 /* size of the device in memory */
132 u64 total_bytes;
133
134 /* size of the device on disk */
135 u64 disk_total_bytes;
136
137 /* bytes used */
138 u64 bytes_used;
139
140 /* optimal io alignment for this device */
141 u32 io_align;
142
143 /* optimal io width for this device */
144 u32 io_width;
145 /* type and info about this device */
146 u64 type;
147
148 /*
149 * Counter of super block write errors, values larger than
150 * BTRFS_SUPER_PRIMARY_WRITE_ERROR encode primary super block write failure.
151 */
152 atomic_t sb_write_errors;
153
154 /* minimal io size for this device */
155 u32 sector_size;
156
157 /* physical drive uuid (or lvm uuid) */
158 u8 uuid[BTRFS_UUID_SIZE];
159
160 /*
161 * size of the device on the current transaction
162 *
163 * This variant is update when committing the transaction,
164 * and protected by chunk mutex
165 */
166 u64 commit_total_bytes;
167
168 /* bytes used on the current transaction */
169 u64 commit_bytes_used;
170
171 /* Bio used for flushing device barriers */
172 struct bio flush_bio;
173 struct completion flush_wait;
174
175 /* per-device scrub information */
176 struct scrub_ctx *scrub_ctx;
177
178 /* disk I/O failure stats. For detailed description refer to
179 * enum btrfs_dev_stat_values in ioctl.h */
180 int dev_stats_valid;
181
182 /* Counter to record the change of device stats */
183 atomic_t dev_stats_ccnt;
184 atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
185
186 struct extent_io_tree alloc_state;
187
188 struct completion kobj_unregister;
189 /* For sysfs/FSID/devinfo/devid/ */
190 struct kobject devid_kobj;
191
192 /* Bandwidth limit for scrub, in bytes */
193 u64 scrub_speed_max;
194 };
195
196 /*
197 * Block group or device which contains an active swapfile. Used for preventing
198 * unsafe operations while a swapfile is active.
199 *
200 * These are sorted on (ptr, inode) (note that a block group or device can
201 * contain more than one swapfile). We compare the pointer values because we
202 * don't actually care what the object is, we just need a quick check whether
203 * the object exists in the rbtree.
204 */
205 struct btrfs_swapfile_pin {
206 struct rb_node node;
207 void *ptr;
208 struct inode *inode;
209 /*
210 * If true, ptr points to a struct btrfs_block_group. Otherwise, ptr
211 * points to a struct btrfs_device.
212 */
213 bool is_block_group;
214 /*
215 * Only used when 'is_block_group' is true and it is the number of
216 * extents used by a swapfile for this block group ('ptr' field).
217 */
218 int bg_extent_count;
219 };
220
221 /*
222 * If we read those variants at the context of their own lock, we needn't
223 * use the following helpers, reading them directly is safe.
224 */
225 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
226 #define BTRFS_DEVICE_GETSET_FUNCS(name) \
227 static inline u64 \
228 btrfs_device_get_##name(const struct btrfs_device *dev) \
229 { \
230 u64 size; \
231 unsigned int seq; \
232 \
233 do { \
234 seq = read_seqcount_begin(&dev->data_seqcount); \
235 size = dev->name; \
236 } while (read_seqcount_retry(&dev->data_seqcount, seq)); \
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 write_seqcount_begin(&dev->data_seqcount); \
245 dev->name = size; \
246 write_seqcount_end(&dev->data_seqcount); \
247 preempt_enable(); \
248 }
249 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
250 #define BTRFS_DEVICE_GETSET_FUNCS(name) \
251 static inline u64 \
252 btrfs_device_get_##name(const struct btrfs_device *dev) \
253 { \
254 u64 size; \
255 \
256 preempt_disable(); \
257 size = dev->name; \
258 preempt_enable(); \
259 return size; \
260 } \
261 \
262 static inline void \
263 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
264 { \
265 preempt_disable(); \
266 dev->name = size; \
267 preempt_enable(); \
268 }
269 #else
270 #define BTRFS_DEVICE_GETSET_FUNCS(name) \
271 static inline u64 \
272 btrfs_device_get_##name(const struct btrfs_device *dev) \
273 { \
274 return dev->name; \
275 } \
276 \
277 static inline void \
278 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
279 { \
280 dev->name = size; \
281 }
282 #endif
283
284 BTRFS_DEVICE_GETSET_FUNCS(total_bytes);
285 BTRFS_DEVICE_GETSET_FUNCS(disk_total_bytes);
286 BTRFS_DEVICE_GETSET_FUNCS(bytes_used);
287
288 enum btrfs_chunk_allocation_policy {
289 BTRFS_CHUNK_ALLOC_REGULAR,
290 BTRFS_CHUNK_ALLOC_ZONED,
291 };
292
293 /*
294 * Read policies for mirrored block group profiles, read picks the stripe based
295 * on these policies.
296 */
297 enum btrfs_read_policy {
298 /* Use process PID to choose the stripe */
299 BTRFS_READ_POLICY_PID,
300 BTRFS_NR_READ_POLICY,
301 };
302
303 #ifdef CONFIG_BTRFS_DEBUG
304 /*
305 * Checksum mode - offload it to workqueues or do it synchronously in
306 * btrfs_submit_chunk().
307 */
308 enum btrfs_offload_csum_mode {
309 /*
310 * Choose offloading checksum or do it synchronously automatically.
311 * Do it synchronously if the checksum is fast, or offload to workqueues
312 * otherwise.
313 */
314 BTRFS_OFFLOAD_CSUM_AUTO,
315 /* Always offload checksum to workqueues. */
316 BTRFS_OFFLOAD_CSUM_FORCE_ON,
317 /* Never offload checksum to workqueues. */
318 BTRFS_OFFLOAD_CSUM_FORCE_OFF,
319 };
320 #endif
321
322 struct btrfs_fs_devices {
323 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
324
325 /*
326 * UUID written into the btree blocks:
327 *
328 * - If metadata_uuid != fsid then super block must have
329 * BTRFS_FEATURE_INCOMPAT_METADATA_UUID flag set.
330 *
331 * - Following shall be true at all times:
332 * - metadata_uuid == btrfs_header::fsid
333 * - metadata_uuid == btrfs_dev_item::fsid
334 *
335 * - Relations between fsid and metadata_uuid in sb and fs_devices:
336 * - Normal:
337 * fs_devices->fsid == fs_devices->metadata_uuid == sb->fsid
338 * sb->metadata_uuid == 0
339 *
340 * - When the BTRFS_FEATURE_INCOMPAT_METADATA_UUID flag is set:
341 * fs_devices->fsid == sb->fsid
342 * fs_devices->metadata_uuid == sb->metadata_uuid
343 *
344 * - When in-memory fs_devices->temp_fsid is true
345 * fs_devices->fsid = random
346 * fs_devices->metadata_uuid == sb->fsid
347 */
348 u8 metadata_uuid[BTRFS_FSID_SIZE];
349
350 struct list_head fs_list;
351
352 /*
353 * Number of devices under this fsid including missing and
354 * replace-target device and excludes seed devices.
355 */
356 u64 num_devices;
357
358 /*
359 * The number of devices that successfully opened, including
360 * replace-target, excludes seed devices.
361 */
362 u64 open_devices;
363
364 /* The number of devices that are under the chunk allocation list. */
365 u64 rw_devices;
366
367 /* Count of missing devices under this fsid excluding seed device. */
368 u64 missing_devices;
369 u64 total_rw_bytes;
370
371 /*
372 * Count of devices from btrfs_super_block::num_devices for this fsid,
373 * which includes the seed device, excludes the transient replace-target
374 * device.
375 */
376 u64 total_devices;
377
378 /* Highest generation number of seen devices */
379 u64 latest_generation;
380
381 /*
382 * The mount device or a device with highest generation after removal
383 * or replace.
384 */
385 struct btrfs_device *latest_dev;
386
387 /*
388 * All of the devices in the filesystem, protected by a mutex so we can
389 * safely walk it to write out the super blocks without worrying about
390 * adding/removing by the multi-device code. Scrubbing super block can
391 * kick off supers writing by holding this mutex lock.
392 */
393 struct mutex device_list_mutex;
394
395 /* List of all devices, protected by device_list_mutex */
396 struct list_head devices;
397
398 /* Devices which can satisfy space allocation. Protected by * chunk_mutex. */
399 struct list_head alloc_list;
400
401 struct list_head seed_list;
402
403 /* Count fs-devices opened. */
404 int opened;
405
406 /* Set when we find or add a device that doesn't have the nonrot flag set. */
407 bool rotating;
408 /* Devices support TRIM/discard commands. */
409 bool discardable;
410 /* The filesystem is a seed filesystem. */
411 bool seeding;
412 /* The mount needs to use a randomly generated fsid. */
413 bool temp_fsid;
414
415 struct btrfs_fs_info *fs_info;
416 /* sysfs kobjects */
417 struct kobject fsid_kobj;
418 struct kobject *devices_kobj;
419 struct kobject *devinfo_kobj;
420 struct completion kobj_unregister;
421
422 enum btrfs_chunk_allocation_policy chunk_alloc_policy;
423
424 /* Policy used to read the mirrored stripes. */
425 enum btrfs_read_policy read_policy;
426
427 #ifdef CONFIG_BTRFS_DEBUG
428 /* Checksum mode - offload it or do it synchronously. */
429 enum btrfs_offload_csum_mode offload_csum_mode;
430 #endif
431 };
432
433 #define BTRFS_MAX_DEVS(info) ((BTRFS_MAX_ITEM_SIZE(info) \
434 - sizeof(struct btrfs_chunk)) \
435 / sizeof(struct btrfs_stripe) + 1)
436
437 #define BTRFS_MAX_DEVS_SYS_CHUNK ((BTRFS_SYSTEM_CHUNK_ARRAY_SIZE \
438 - 2 * sizeof(struct btrfs_disk_key) \
439 - 2 * sizeof(struct btrfs_chunk)) \
440 / sizeof(struct btrfs_stripe) + 1)
441
442 struct btrfs_io_stripe {
443 struct btrfs_device *dev;
444 /* Block mapping. */
445 u64 physical;
446 u64 length;
447 bool rst_search_commit_root;
448 /* For the endio handler. */
449 struct btrfs_io_context *bioc;
450 };
451
452 struct btrfs_discard_stripe {
453 struct btrfs_device *dev;
454 u64 physical;
455 u64 length;
456 };
457
458 /*
459 * Context for IO subsmission for device stripe.
460 *
461 * - Track the unfinished mirrors for mirror based profiles
462 * Mirror based profiles are SINGLE/DUP/RAID1/RAID10.
463 *
464 * - Contain the logical -> physical mapping info
465 * Used by submit_stripe_bio() for mapping logical bio
466 * into physical device address.
467 *
468 * - Contain device replace info
469 * Used by handle_ops_on_dev_replace() to copy logical bios
470 * into the new device.
471 *
472 * - Contain RAID56 full stripe logical bytenrs
473 */
474 struct btrfs_io_context {
475 refcount_t refs;
476 struct btrfs_fs_info *fs_info;
477 /* Taken from struct btrfs_chunk_map::type. */
478 u64 map_type;
479 struct bio *orig_bio;
480 atomic_t error;
481 u16 max_errors;
482
483 u64 logical;
484 u64 size;
485 /* Raid stripe tree ordered entry. */
486 struct list_head rst_ordered_entry;
487
488 /*
489 * The total number of stripes, including the extra duplicated
490 * stripe for replace.
491 */
492 u16 num_stripes;
493
494 /*
495 * The mirror_num of this bioc.
496 *
497 * This is for reads which use 0 as mirror_num, thus we should return a
498 * valid mirror_num (>0) for the reader.
499 */
500 u16 mirror_num;
501
502 /*
503 * The following two members are for dev-replace case only.
504 *
505 * @replace_nr_stripes: Number of duplicated stripes which need to be
506 * written to replace target.
507 * Should be <= 2 (2 for DUP, otherwise <= 1).
508 * @replace_stripe_src: The array indicates where the duplicated stripes
509 * are from.
510 *
511 * The @replace_stripe_src[] array is mostly for RAID56 cases.
512 * As non-RAID56 stripes share the same contents of the mapped range,
513 * thus no need to bother where the duplicated ones are from.
514 *
515 * But for RAID56 case, all stripes contain different contents, thus
516 * we need a way to know the mapping.
517 *
518 * There is an example for the two members, using a RAID5 write:
519 *
520 * num_stripes: 4 (3 + 1 duplicated write)
521 * stripes[0]: dev = devid 1, physical = X
522 * stripes[1]: dev = devid 2, physical = Y
523 * stripes[2]: dev = devid 3, physical = Z
524 * stripes[3]: dev = devid 0, physical = Y
525 *
526 * replace_nr_stripes = 1
527 * replace_stripe_src = 1 <- Means stripes[1] is involved in replace.
528 * The duplicated stripe index would be
529 * (@num_stripes - 1).
530 *
531 * Note, that we can still have cases replace_nr_stripes = 2 for DUP.
532 * In that case, all stripes share the same content, thus we don't
533 * need to bother @replace_stripe_src value at all.
534 */
535 u16 replace_nr_stripes;
536 s16 replace_stripe_src;
537 /*
538 * Logical bytenr of the full stripe start, only for RAID56 cases.
539 *
540 * When this value is set to other than (u64)-1, the stripes[] should
541 * follow this pattern:
542 *
543 * (real_stripes = num_stripes - replace_nr_stripes)
544 * (data_stripes = (is_raid6) ? (real_stripes - 2) : (real_stripes - 1))
545 *
546 * stripes[0]: The first data stripe
547 * stripes[1]: The second data stripe
548 * ...
549 * stripes[data_stripes - 1]: The last data stripe
550 * stripes[data_stripes]: The P stripe
551 * stripes[data_stripes + 1]: The Q stripe (only for RAID6).
552 */
553 u64 full_stripe_logical;
554 struct btrfs_io_stripe stripes[];
555 };
556
557 struct btrfs_device_info {
558 struct btrfs_device *dev;
559 u64 dev_offset;
560 u64 max_avail;
561 u64 total_avail;
562 };
563
564 struct btrfs_raid_attr {
565 u8 sub_stripes; /* sub_stripes info for map */
566 u8 dev_stripes; /* stripes per dev */
567 u8 devs_max; /* max devs to use */
568 u8 devs_min; /* min devs needed */
569 u8 tolerated_failures; /* max tolerated fail devs */
570 u8 devs_increment; /* ndevs has to be a multiple of this */
571 u8 ncopies; /* how many copies to data has */
572 u8 nparity; /* number of stripes worth of bytes to store
573 * parity information */
574 u8 mindev_error; /* error code if min devs requisite is unmet */
575 const char raid_name[8]; /* name of the raid */
576 u64 bg_flag; /* block group flag of the raid */
577 };
578
579 extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES];
580
581 struct btrfs_chunk_map {
582 struct rb_node rb_node;
583 /* For mount time dev extent verification. */
584 int verified_stripes;
585 refcount_t refs;
586 u64 start;
587 u64 chunk_len;
588 u64 stripe_size;
589 u64 type;
590 int io_align;
591 int io_width;
592 int num_stripes;
593 int sub_stripes;
594 struct btrfs_io_stripe stripes[];
595 };
596
597 #define btrfs_chunk_map_size(n) (sizeof(struct btrfs_chunk_map) + \
598 (sizeof(struct btrfs_io_stripe) * (n)))
599
btrfs_free_chunk_map(struct btrfs_chunk_map * map)600 static inline void btrfs_free_chunk_map(struct btrfs_chunk_map *map)
601 {
602 if (map && refcount_dec_and_test(&map->refs)) {
603 ASSERT(RB_EMPTY_NODE(&map->rb_node));
604 kfree(map);
605 }
606 }
607
608 struct btrfs_balance_control {
609 struct btrfs_balance_args data;
610 struct btrfs_balance_args meta;
611 struct btrfs_balance_args sys;
612
613 u64 flags;
614
615 struct btrfs_balance_progress stat;
616 };
617
618 /*
619 * Search for a given device by the set parameters
620 */
621 struct btrfs_dev_lookup_args {
622 u64 devid;
623 u8 *uuid;
624 u8 *fsid;
625 bool missing;
626 };
627
628 /* We have to initialize to -1 because BTRFS_DEV_REPLACE_DEVID is 0 */
629 #define BTRFS_DEV_LOOKUP_ARGS_INIT { .devid = (u64)-1 }
630
631 #define BTRFS_DEV_LOOKUP_ARGS(name) \
632 struct btrfs_dev_lookup_args name = BTRFS_DEV_LOOKUP_ARGS_INIT
633
634 enum btrfs_map_op {
635 BTRFS_MAP_READ,
636 BTRFS_MAP_WRITE,
637 BTRFS_MAP_GET_READ_MIRRORS,
638 };
639
btrfs_op(struct bio * bio)640 static inline enum btrfs_map_op btrfs_op(struct bio *bio)
641 {
642 switch (bio_op(bio)) {
643 case REQ_OP_WRITE:
644 case REQ_OP_ZONE_APPEND:
645 return BTRFS_MAP_WRITE;
646 default:
647 WARN_ON_ONCE(1);
648 fallthrough;
649 case REQ_OP_READ:
650 return BTRFS_MAP_READ;
651 }
652 }
653
btrfs_chunk_item_size(int num_stripes)654 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
655 {
656 ASSERT(num_stripes);
657 return sizeof(struct btrfs_chunk) +
658 sizeof(struct btrfs_stripe) * (num_stripes - 1);
659 }
660
661 /*
662 * Do the type safe conversion from stripe_nr to offset inside the chunk.
663 *
664 * @stripe_nr is u32, with left shift it can overflow u32 for chunks larger
665 * than 4G. This does the proper type cast to avoid overflow.
666 */
btrfs_stripe_nr_to_offset(u32 stripe_nr)667 static inline u64 btrfs_stripe_nr_to_offset(u32 stripe_nr)
668 {
669 return (u64)stripe_nr << BTRFS_STRIPE_LEN_SHIFT;
670 }
671
672 void btrfs_get_bioc(struct btrfs_io_context *bioc);
673 void btrfs_put_bioc(struct btrfs_io_context *bioc);
674 int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
675 u64 logical, u64 *length,
676 struct btrfs_io_context **bioc_ret,
677 struct btrfs_io_stripe *smap, int *mirror_num_ret);
678 int btrfs_map_repair_block(struct btrfs_fs_info *fs_info,
679 struct btrfs_io_stripe *smap, u64 logical,
680 u32 length, int mirror_num);
681 struct btrfs_discard_stripe *btrfs_map_discard(struct btrfs_fs_info *fs_info,
682 u64 logical, u64 *length_ret,
683 u32 *num_stripes);
684 int btrfs_read_sys_array(struct btrfs_fs_info *fs_info);
685 int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info);
686 struct btrfs_block_group *btrfs_create_chunk(struct btrfs_trans_handle *trans,
687 u64 type);
688 void btrfs_mapping_tree_free(struct btrfs_fs_info *fs_info);
689 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
690 blk_mode_t flags, void *holder);
691 struct btrfs_device *btrfs_scan_one_device(const char *path, blk_mode_t flags,
692 bool mount_arg_dev);
693 int btrfs_forget_devices(dev_t devt);
694 void btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
695 void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices);
696 void btrfs_assign_next_active_device(struct btrfs_device *device,
697 struct btrfs_device *this_dev);
698 struct btrfs_device *btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info,
699 u64 devid,
700 const char *devpath);
701 int btrfs_get_dev_args_from_path(struct btrfs_fs_info *fs_info,
702 struct btrfs_dev_lookup_args *args,
703 const char *path);
704 struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
705 const u64 *devid, const u8 *uuid,
706 const char *path);
707 void btrfs_put_dev_args_from_path(struct btrfs_dev_lookup_args *args);
708 int btrfs_rm_device(struct btrfs_fs_info *fs_info,
709 struct btrfs_dev_lookup_args *args,
710 struct file **bdev_file);
711 void __exit btrfs_cleanup_fs_uuids(void);
712 int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
713 int btrfs_grow_device(struct btrfs_trans_handle *trans,
714 struct btrfs_device *device, u64 new_size);
715 struct btrfs_device *btrfs_find_device(const struct btrfs_fs_devices *fs_devices,
716 const struct btrfs_dev_lookup_args *args);
717 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
718 int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *path);
719 int btrfs_balance(struct btrfs_fs_info *fs_info,
720 struct btrfs_balance_control *bctl,
721 struct btrfs_ioctl_balance_args *bargs);
722 void btrfs_describe_block_groups(u64 flags, char *buf, u32 size_buf);
723 int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
724 int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
725 int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
726 int btrfs_relocate_chunk(struct btrfs_fs_info *fs_info, u64 chunk_offset);
727 int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
728 bool btrfs_chunk_writeable(struct btrfs_fs_info *fs_info, u64 chunk_offset);
729 void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
730 int btrfs_get_dev_stats(struct btrfs_fs_info *fs_info,
731 struct btrfs_ioctl_get_dev_stats *stats);
732 int btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
733 int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
734 int btrfs_run_dev_stats(struct btrfs_trans_handle *trans);
735 void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_device *srcdev);
736 void btrfs_rm_dev_replace_free_srcdev(struct btrfs_device *srcdev);
737 void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device *tgtdev);
738 int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info,
739 u64 logical, u64 len);
740 unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
741 u64 logical);
742 u64 btrfs_calc_stripe_length(const struct btrfs_chunk_map *map);
743 int btrfs_nr_parity_stripes(u64 type);
744 int btrfs_chunk_alloc_add_chunk_item(struct btrfs_trans_handle *trans,
745 struct btrfs_block_group *bg);
746 int btrfs_remove_chunk(struct btrfs_trans_handle *trans, u64 chunk_offset);
747
748 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
749 struct btrfs_chunk_map *btrfs_alloc_chunk_map(int num_stripes, gfp_t gfp);
750 int btrfs_add_chunk_map(struct btrfs_fs_info *fs_info, struct btrfs_chunk_map *map);
751 #endif
752
753 struct btrfs_chunk_map *btrfs_find_chunk_map(struct btrfs_fs_info *fs_info,
754 u64 logical, u64 length);
755 struct btrfs_chunk_map *btrfs_find_chunk_map_nolock(struct btrfs_fs_info *fs_info,
756 u64 logical, u64 length);
757 struct btrfs_chunk_map *btrfs_get_chunk_map(struct btrfs_fs_info *fs_info,
758 u64 logical, u64 length);
759 void btrfs_remove_chunk_map(struct btrfs_fs_info *fs_info, struct btrfs_chunk_map *map);
760 void btrfs_release_disk_super(struct btrfs_super_block *super);
761
btrfs_dev_stat_inc(struct btrfs_device * dev,int index)762 static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
763 int index)
764 {
765 atomic_inc(dev->dev_stat_values + index);
766 /*
767 * This memory barrier orders stores updating statistics before stores
768 * updating dev_stats_ccnt.
769 *
770 * It pairs with smp_rmb() in btrfs_run_dev_stats().
771 */
772 smp_mb__before_atomic();
773 atomic_inc(&dev->dev_stats_ccnt);
774 }
775
btrfs_dev_stat_read(struct btrfs_device * dev,int index)776 static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
777 int index)
778 {
779 return atomic_read(dev->dev_stat_values + index);
780 }
781
btrfs_dev_stat_read_and_reset(struct btrfs_device * dev,int index)782 static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
783 int index)
784 {
785 int ret;
786
787 ret = atomic_xchg(dev->dev_stat_values + index, 0);
788 /*
789 * atomic_xchg implies a full memory barriers as per atomic_t.txt:
790 * - RMW operations that have a return value are fully ordered;
791 *
792 * This implicit memory barriers is paired with the smp_rmb in
793 * btrfs_run_dev_stats
794 */
795 atomic_inc(&dev->dev_stats_ccnt);
796 return ret;
797 }
798
btrfs_dev_stat_set(struct btrfs_device * dev,int index,unsigned long val)799 static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
800 int index, unsigned long val)
801 {
802 atomic_set(dev->dev_stat_values + index, val);
803 /*
804 * This memory barrier orders stores updating statistics before stores
805 * updating dev_stats_ccnt.
806 *
807 * It pairs with smp_rmb() in btrfs_run_dev_stats().
808 */
809 smp_mb__before_atomic();
810 atomic_inc(&dev->dev_stats_ccnt);
811 }
812
btrfs_dev_name(const struct btrfs_device * device)813 static inline const char *btrfs_dev_name(const struct btrfs_device *device)
814 {
815 if (!device || test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state))
816 return "<missing disk>";
817 else
818 return rcu_str_deref(device->name);
819 }
820
821 void btrfs_commit_device_sizes(struct btrfs_transaction *trans);
822
823 struct list_head * __attribute_const__ btrfs_get_fs_uuids(void);
824 bool btrfs_check_rw_degradable(struct btrfs_fs_info *fs_info,
825 struct btrfs_device *failing_dev);
826 void btrfs_scratch_superblocks(struct btrfs_fs_info *fs_info, struct btrfs_device *device);
827
828 enum btrfs_raid_types __attribute_const__ btrfs_bg_flags_to_raid_index(u64 flags);
829 int btrfs_bg_type_to_factor(u64 flags);
830 const char *btrfs_bg_type_to_raid_name(u64 flags);
831 int btrfs_verify_dev_extents(struct btrfs_fs_info *fs_info);
832 bool btrfs_repair_one_zone(struct btrfs_fs_info *fs_info, u64 logical);
833
834 bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr);
835 const u8 *btrfs_sb_fsid_ptr(const struct btrfs_super_block *sb);
836
837 #endif
838