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