1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2007 Oracle. All rights reserved. 4 */ 5 6 #ifndef BTRFS_VOLUMES_H 7 #define BTRFS_VOLUMES_H 8 9 #include <linux/sort.h> 10 #include <linux/btrfs.h> 11 #include "async-thread.h" 12 #include "messages.h" 13 #include "tree-checker.h" 14 #include "rcu-string.h" 15 16 #define BTRFS_MAX_DATA_CHUNK_SIZE (10ULL * SZ_1G) 17 18 /* 19 * Arbitratry maximum size of one discard request to limit potentially long time 20 * spent in blkdev_issue_discard(). 21 */ 22 #define BTRFS_MAX_DISCARD_CHUNK_SIZE (SZ_1G) 23 24 extern struct mutex uuid_mutex; 25 26 #define BTRFS_STRIPE_LEN SZ_64K 27 #define BTRFS_STRIPE_LEN_SHIFT (16) 28 #define BTRFS_STRIPE_LEN_MASK (BTRFS_STRIPE_LEN - 1) 29 30 static_assert(const_ilog2(BTRFS_STRIPE_LEN) == BTRFS_STRIPE_LEN_SHIFT); 31 32 /* Used by sanity check for btrfs_raid_types. */ 33 #define const_ffs(n) (__builtin_ctzll(n) + 1) 34 35 /* 36 * The conversion from BTRFS_BLOCK_GROUP_* bits to btrfs_raid_type requires 37 * RAID0 always to be the lowest profile bit. 38 * Although it's part of on-disk format and should never change, do extra 39 * compile-time sanity checks. 40 */ 41 static_assert(const_ffs(BTRFS_BLOCK_GROUP_RAID0) < 42 const_ffs(BTRFS_BLOCK_GROUP_PROFILE_MASK & ~BTRFS_BLOCK_GROUP_RAID0)); 43 static_assert(const_ilog2(BTRFS_BLOCK_GROUP_RAID0) > 44 ilog2(BTRFS_BLOCK_GROUP_TYPE_MASK)); 45 46 /* ilog2() can handle both constants and variables */ 47 #define BTRFS_BG_FLAG_TO_INDEX(profile) \ 48 ilog2((profile) >> (ilog2(BTRFS_BLOCK_GROUP_RAID0) - 1)) 49 50 enum btrfs_raid_types { 51 /* SINGLE is the special one as it doesn't have on-disk bit. */ 52 BTRFS_RAID_SINGLE = 0, 53 54 BTRFS_RAID_RAID0 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID0), 55 BTRFS_RAID_RAID1 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1), 56 BTRFS_RAID_DUP = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_DUP), 57 BTRFS_RAID_RAID10 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID10), 58 BTRFS_RAID_RAID5 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID5), 59 BTRFS_RAID_RAID6 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID6), 60 BTRFS_RAID_RAID1C3 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1C3), 61 BTRFS_RAID_RAID1C4 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1C4), 62 63 BTRFS_NR_RAID_TYPES 64 }; 65 66 /* 67 * Use sequence counter to get consistent device stat data on 68 * 32-bit processors. 69 */ 70 #if BITS_PER_LONG==32 && defined(CONFIG_SMP) 71 #include <linux/seqlock.h> 72 #define __BTRFS_NEED_DEVICE_DATA_ORDERED 73 #define btrfs_device_data_ordered_init(device) \ 74 seqcount_init(&device->data_seqcount) 75 #else 76 #define btrfs_device_data_ordered_init(device) do { } while (0) 77 #endif 78 79 #define BTRFS_DEV_STATE_WRITEABLE (0) 80 #define BTRFS_DEV_STATE_IN_FS_METADATA (1) 81 #define BTRFS_DEV_STATE_MISSING (2) 82 #define BTRFS_DEV_STATE_REPLACE_TGT (3) 83 #define BTRFS_DEV_STATE_FLUSH_SENT (4) 84 #define BTRFS_DEV_STATE_NO_READA (5) 85 86 struct btrfs_zoned_device_info; 87 88 struct btrfs_device { 89 struct list_head dev_list; /* device_list_mutex */ 90 struct list_head dev_alloc_list; /* chunk mutex */ 91 struct list_head post_commit_list; /* chunk mutex */ 92 struct btrfs_fs_devices *fs_devices; 93 struct btrfs_fs_info *fs_info; 94 95 struct rcu_string __rcu *name; 96 97 u64 generation; 98 99 struct block_device *bdev; 100 101 struct btrfs_zoned_device_info *zone_info; 102 103 /* block device holder for blkdev_get/put */ 104 void *holder; 105 106 /* 107 * Device's major-minor number. Must be set even if the device is not 108 * opened (bdev == NULL), unless the device is missing. 109 */ 110 dev_t devt; 111 unsigned long dev_state; 112 blk_status_t last_flush_error; 113 114 #ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED 115 seqcount_t data_seqcount; 116 #endif 117 118 /* the internal btrfs device id */ 119 u64 devid; 120 121 /* size of the device in memory */ 122 u64 total_bytes; 123 124 /* size of the device on disk */ 125 u64 disk_total_bytes; 126 127 /* bytes used */ 128 u64 bytes_used; 129 130 /* optimal io alignment for this device */ 131 u32 io_align; 132 133 /* optimal io width for this device */ 134 u32 io_width; 135 /* type and info about this device */ 136 u64 type; 137 138 /* minimal io size for this device */ 139 u32 sector_size; 140 141 /* physical drive uuid (or lvm uuid) */ 142 u8 uuid[BTRFS_UUID_SIZE]; 143 144 /* 145 * size of the device on the current transaction 146 * 147 * This variant is update when committing the transaction, 148 * and protected by chunk mutex 149 */ 150 u64 commit_total_bytes; 151 152 /* bytes used on the current transaction */ 153 u64 commit_bytes_used; 154 155 /* Bio used for flushing device barriers */ 156 struct bio flush_bio; 157 struct completion flush_wait; 158 159 /* per-device scrub information */ 160 struct scrub_ctx *scrub_ctx; 161 162 /* disk I/O failure stats. For detailed description refer to 163 * enum btrfs_dev_stat_values in ioctl.h */ 164 int dev_stats_valid; 165 166 /* Counter to record the change of device stats */ 167 atomic_t dev_stats_ccnt; 168 atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX]; 169 170 struct extent_io_tree alloc_state; 171 172 struct completion kobj_unregister; 173 /* For sysfs/FSID/devinfo/devid/ */ 174 struct kobject devid_kobj; 175 176 /* Bandwidth limit for scrub, in bytes */ 177 u64 scrub_speed_max; 178 }; 179 180 /* 181 * Block group or device which contains an active swapfile. Used for preventing 182 * unsafe operations while a swapfile is active. 183 * 184 * These are sorted on (ptr, inode) (note that a block group or device can 185 * contain more than one swapfile). We compare the pointer values because we 186 * don't actually care what the object is, we just need a quick check whether 187 * the object exists in the rbtree. 188 */ 189 struct btrfs_swapfile_pin { 190 struct rb_node node; 191 void *ptr; 192 struct inode *inode; 193 /* 194 * If true, ptr points to a struct btrfs_block_group. Otherwise, ptr 195 * points to a struct btrfs_device. 196 */ 197 bool is_block_group; 198 /* 199 * Only used when 'is_block_group' is true and it is the number of 200 * extents used by a swapfile for this block group ('ptr' field). 201 */ 202 int bg_extent_count; 203 }; 204 205 /* 206 * If we read those variants at the context of their own lock, we needn't 207 * use the following helpers, reading them directly is safe. 208 */ 209 #if BITS_PER_LONG==32 && defined(CONFIG_SMP) 210 #define BTRFS_DEVICE_GETSET_FUNCS(name) \ 211 static inline u64 \ 212 btrfs_device_get_##name(const struct btrfs_device *dev) \ 213 { \ 214 u64 size; \ 215 unsigned int seq; \ 216 \ 217 do { \ 218 seq = read_seqcount_begin(&dev->data_seqcount); \ 219 size = dev->name; \ 220 } while (read_seqcount_retry(&dev->data_seqcount, seq)); \ 221 return size; \ 222 } \ 223 \ 224 static inline void \ 225 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \ 226 { \ 227 preempt_disable(); \ 228 write_seqcount_begin(&dev->data_seqcount); \ 229 dev->name = size; \ 230 write_seqcount_end(&dev->data_seqcount); \ 231 preempt_enable(); \ 232 } 233 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION) 234 #define BTRFS_DEVICE_GETSET_FUNCS(name) \ 235 static inline u64 \ 236 btrfs_device_get_##name(const struct btrfs_device *dev) \ 237 { \ 238 u64 size; \ 239 \ 240 preempt_disable(); \ 241 size = dev->name; \ 242 preempt_enable(); \ 243 return size; \ 244 } \ 245 \ 246 static inline void \ 247 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \ 248 { \ 249 preempt_disable(); \ 250 dev->name = size; \ 251 preempt_enable(); \ 252 } 253 #else 254 #define BTRFS_DEVICE_GETSET_FUNCS(name) \ 255 static inline u64 \ 256 btrfs_device_get_##name(const struct btrfs_device *dev) \ 257 { \ 258 return dev->name; \ 259 } \ 260 \ 261 static inline void \ 262 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \ 263 { \ 264 dev->name = size; \ 265 } 266 #endif 267 268 BTRFS_DEVICE_GETSET_FUNCS(total_bytes); 269 BTRFS_DEVICE_GETSET_FUNCS(disk_total_bytes); 270 BTRFS_DEVICE_GETSET_FUNCS(bytes_used); 271 272 enum btrfs_chunk_allocation_policy { 273 BTRFS_CHUNK_ALLOC_REGULAR, 274 BTRFS_CHUNK_ALLOC_ZONED, 275 }; 276 277 /* 278 * Read policies for mirrored block group profiles, read picks the stripe based 279 * on these policies. 280 */ 281 enum btrfs_read_policy { 282 /* Use process PID to choose the stripe */ 283 BTRFS_READ_POLICY_PID, 284 BTRFS_NR_READ_POLICY, 285 }; 286 287 struct btrfs_fs_devices { 288 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 289 290 /* 291 * UUID written into the btree blocks: 292 * 293 * - If metadata_uuid != fsid then super block must have 294 * BTRFS_FEATURE_INCOMPAT_METADATA_UUID flag set. 295 * 296 * - Following shall be true at all times: 297 * - metadata_uuid == btrfs_header::fsid 298 * - metadata_uuid == btrfs_dev_item::fsid 299 */ 300 u8 metadata_uuid[BTRFS_FSID_SIZE]; 301 302 struct list_head fs_list; 303 304 /* 305 * Number of devices under this fsid including missing and 306 * replace-target device and excludes seed devices. 307 */ 308 u64 num_devices; 309 310 /* 311 * The number of devices that successfully opened, including 312 * replace-target, excludes seed devices. 313 */ 314 u64 open_devices; 315 316 /* The number of devices that are under the chunk allocation list. */ 317 u64 rw_devices; 318 319 /* Count of missing devices under this fsid excluding seed device. */ 320 u64 missing_devices; 321 u64 total_rw_bytes; 322 323 /* 324 * Count of devices from btrfs_super_block::num_devices for this fsid, 325 * which includes the seed device, excludes the transient replace-target 326 * device. 327 */ 328 u64 total_devices; 329 330 /* Highest generation number of seen devices */ 331 u64 latest_generation; 332 333 /* 334 * The mount device or a device with highest generation after removal 335 * or replace. 336 */ 337 struct btrfs_device *latest_dev; 338 339 /* 340 * All of the devices in the filesystem, protected by a mutex so we can 341 * safely walk it to write out the super blocks without worrying about 342 * adding/removing by the multi-device code. Scrubbing super block can 343 * kick off supers writing by holding this mutex lock. 344 */ 345 struct mutex device_list_mutex; 346 347 /* List of all devices, protected by device_list_mutex */ 348 struct list_head devices; 349 350 /* Devices which can satisfy space allocation. Protected by * chunk_mutex. */ 351 struct list_head alloc_list; 352 353 struct list_head seed_list; 354 355 /* Count fs-devices opened. */ 356 int opened; 357 358 /* Set when we find or add a device that doesn't have the nonrot flag set. */ 359 bool rotating; 360 /* Devices support TRIM/discard commands. */ 361 bool discardable; 362 bool fsid_change; 363 /* The filesystem is a seed filesystem. */ 364 bool seeding; 365 366 struct btrfs_fs_info *fs_info; 367 /* sysfs kobjects */ 368 struct kobject fsid_kobj; 369 struct kobject *devices_kobj; 370 struct kobject *devinfo_kobj; 371 struct completion kobj_unregister; 372 373 enum btrfs_chunk_allocation_policy chunk_alloc_policy; 374 375 /* Policy used to read the mirrored stripes. */ 376 enum btrfs_read_policy read_policy; 377 }; 378 379 #define BTRFS_MAX_DEVS(info) ((BTRFS_MAX_ITEM_SIZE(info) \ 380 - sizeof(struct btrfs_chunk)) \ 381 / sizeof(struct btrfs_stripe) + 1) 382 383 #define BTRFS_MAX_DEVS_SYS_CHUNK ((BTRFS_SYSTEM_CHUNK_ARRAY_SIZE \ 384 - 2 * sizeof(struct btrfs_disk_key) \ 385 - 2 * sizeof(struct btrfs_chunk)) \ 386 / sizeof(struct btrfs_stripe) + 1) 387 388 struct btrfs_io_stripe { 389 struct btrfs_device *dev; 390 union { 391 /* Block mapping */ 392 u64 physical; 393 /* For the endio handler */ 394 struct btrfs_io_context *bioc; 395 }; 396 }; 397 398 struct btrfs_discard_stripe { 399 struct btrfs_device *dev; 400 u64 physical; 401 u64 length; 402 }; 403 404 /* 405 * Context for IO subsmission for device stripe. 406 * 407 * - Track the unfinished mirrors for mirror based profiles 408 * Mirror based profiles are SINGLE/DUP/RAID1/RAID10. 409 * 410 * - Contain the logical -> physical mapping info 411 * Used by submit_stripe_bio() for mapping logical bio 412 * into physical device address. 413 * 414 * - Contain device replace info 415 * Used by handle_ops_on_dev_replace() to copy logical bios 416 * into the new device. 417 * 418 * - Contain RAID56 full stripe logical bytenrs 419 */ 420 struct btrfs_io_context { 421 refcount_t refs; 422 struct btrfs_fs_info *fs_info; 423 u64 map_type; /* get from map_lookup->type */ 424 struct bio *orig_bio; 425 atomic_t error; 426 u16 max_errors; 427 428 /* 429 * The total number of stripes, including the extra duplicated 430 * stripe for replace. 431 */ 432 u16 num_stripes; 433 434 /* 435 * The mirror_num of this bioc. 436 * 437 * This is for reads which use 0 as mirror_num, thus we should return a 438 * valid mirror_num (>0) for the reader. 439 */ 440 u16 mirror_num; 441 442 /* 443 * The following two members are for dev-replace case only. 444 * 445 * @replace_nr_stripes: Number of duplicated stripes which need to be 446 * written to replace target. 447 * Should be <= 2 (2 for DUP, otherwise <= 1). 448 * @replace_stripe_src: The array indicates where the duplicated stripes 449 * are from. 450 * 451 * The @replace_stripe_src[] array is mostly for RAID56 cases. 452 * As non-RAID56 stripes share the same contents of the mapped range, 453 * thus no need to bother where the duplicated ones are from. 454 * 455 * But for RAID56 case, all stripes contain different contents, thus 456 * we need a way to know the mapping. 457 * 458 * There is an example for the two members, using a RAID5 write: 459 * 460 * num_stripes: 4 (3 + 1 duplicated write) 461 * stripes[0]: dev = devid 1, physical = X 462 * stripes[1]: dev = devid 2, physical = Y 463 * stripes[2]: dev = devid 3, physical = Z 464 * stripes[3]: dev = devid 0, physical = Y 465 * 466 * replace_nr_stripes = 1 467 * replace_stripe_src = 1 <- Means stripes[1] is involved in replace. 468 * The duplicated stripe index would be 469 * (@num_stripes - 1). 470 * 471 * Note, that we can still have cases replace_nr_stripes = 2 for DUP. 472 * In that case, all stripes share the same content, thus we don't 473 * need to bother @replace_stripe_src value at all. 474 */ 475 u16 replace_nr_stripes; 476 s16 replace_stripe_src; 477 /* 478 * Logical bytenr of the full stripe start, only for RAID56 cases. 479 * 480 * When this value is set to other than (u64)-1, the stripes[] should 481 * follow this pattern: 482 * 483 * (real_stripes = num_stripes - replace_nr_stripes) 484 * (data_stripes = (is_raid6) ? (real_stripes - 2) : (real_stripes - 1)) 485 * 486 * stripes[0]: The first data stripe 487 * stripes[1]: The second data stripe 488 * ... 489 * stripes[data_stripes - 1]: The last data stripe 490 * stripes[data_stripes]: The P stripe 491 * stripes[data_stripes + 1]: The Q stripe (only for RAID6). 492 */ 493 u64 full_stripe_logical; 494 struct btrfs_io_stripe stripes[]; 495 }; 496 497 struct btrfs_device_info { 498 struct btrfs_device *dev; 499 u64 dev_offset; 500 u64 max_avail; 501 u64 total_avail; 502 }; 503 504 struct btrfs_raid_attr { 505 u8 sub_stripes; /* sub_stripes info for map */ 506 u8 dev_stripes; /* stripes per dev */ 507 u8 devs_max; /* max devs to use */ 508 u8 devs_min; /* min devs needed */ 509 u8 tolerated_failures; /* max tolerated fail devs */ 510 u8 devs_increment; /* ndevs has to be a multiple of this */ 511 u8 ncopies; /* how many copies to data has */ 512 u8 nparity; /* number of stripes worth of bytes to store 513 * parity information */ 514 u8 mindev_error; /* error code if min devs requisite is unmet */ 515 const char raid_name[8]; /* name of the raid */ 516 u64 bg_flag; /* block group flag of the raid */ 517 }; 518 519 extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES]; 520 521 struct map_lookup { 522 u64 type; 523 int io_align; 524 int io_width; 525 int num_stripes; 526 int sub_stripes; 527 int verified_stripes; /* For mount time dev extent verification */ 528 struct btrfs_io_stripe stripes[]; 529 }; 530 531 #define map_lookup_size(n) (sizeof(struct map_lookup) + \ 532 (sizeof(struct btrfs_io_stripe) * (n))) 533 534 struct btrfs_balance_args; 535 struct btrfs_balance_progress; 536 struct btrfs_balance_control { 537 struct btrfs_balance_args data; 538 struct btrfs_balance_args meta; 539 struct btrfs_balance_args sys; 540 541 u64 flags; 542 543 struct btrfs_balance_progress stat; 544 }; 545 546 /* 547 * Search for a given device by the set parameters 548 */ 549 struct btrfs_dev_lookup_args { 550 u64 devid; 551 u8 *uuid; 552 u8 *fsid; 553 bool missing; 554 }; 555 556 /* We have to initialize to -1 because BTRFS_DEV_REPLACE_DEVID is 0 */ 557 #define BTRFS_DEV_LOOKUP_ARGS_INIT { .devid = (u64)-1 } 558 559 #define BTRFS_DEV_LOOKUP_ARGS(name) \ 560 struct btrfs_dev_lookup_args name = BTRFS_DEV_LOOKUP_ARGS_INIT 561 562 enum btrfs_map_op { 563 BTRFS_MAP_READ, 564 BTRFS_MAP_WRITE, 565 BTRFS_MAP_GET_READ_MIRRORS, 566 }; 567 568 static inline enum btrfs_map_op btrfs_op(struct bio *bio) 569 { 570 switch (bio_op(bio)) { 571 case REQ_OP_WRITE: 572 case REQ_OP_ZONE_APPEND: 573 return BTRFS_MAP_WRITE; 574 default: 575 WARN_ON_ONCE(1); 576 fallthrough; 577 case REQ_OP_READ: 578 return BTRFS_MAP_READ; 579 } 580 } 581 582 static inline unsigned long btrfs_chunk_item_size(int num_stripes) 583 { 584 ASSERT(num_stripes); 585 return sizeof(struct btrfs_chunk) + 586 sizeof(struct btrfs_stripe) * (num_stripes - 1); 587 } 588 589 /* 590 * Do the type safe converstion from stripe_nr to offset inside the chunk. 591 * 592 * @stripe_nr is u32, with left shift it can overflow u32 for chunks larger 593 * than 4G. This does the proper type cast to avoid overflow. 594 */ 595 static inline u64 btrfs_stripe_nr_to_offset(u32 stripe_nr) 596 { 597 return (u64)stripe_nr << BTRFS_STRIPE_LEN_SHIFT; 598 } 599 600 void btrfs_get_bioc(struct btrfs_io_context *bioc); 601 void btrfs_put_bioc(struct btrfs_io_context *bioc); 602 int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, 603 u64 logical, u64 *length, 604 struct btrfs_io_context **bioc_ret, 605 struct btrfs_io_stripe *smap, int *mirror_num_ret, 606 int need_raid_map); 607 int btrfs_map_repair_block(struct btrfs_fs_info *fs_info, 608 struct btrfs_io_stripe *smap, u64 logical, 609 u32 length, int mirror_num); 610 struct btrfs_discard_stripe *btrfs_map_discard(struct btrfs_fs_info *fs_info, 611 u64 logical, u64 *length_ret, 612 u32 *num_stripes); 613 int btrfs_read_sys_array(struct btrfs_fs_info *fs_info); 614 int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info); 615 struct btrfs_block_group *btrfs_create_chunk(struct btrfs_trans_handle *trans, 616 u64 type); 617 void btrfs_mapping_tree_free(struct extent_map_tree *tree); 618 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, 619 blk_mode_t flags, void *holder); 620 struct btrfs_device *btrfs_scan_one_device(const char *path, blk_mode_t flags); 621 int btrfs_forget_devices(dev_t devt); 622 void btrfs_close_devices(struct btrfs_fs_devices *fs_devices); 623 void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices); 624 void btrfs_assign_next_active_device(struct btrfs_device *device, 625 struct btrfs_device *this_dev); 626 struct btrfs_device *btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info, 627 u64 devid, 628 const char *devpath); 629 int btrfs_get_dev_args_from_path(struct btrfs_fs_info *fs_info, 630 struct btrfs_dev_lookup_args *args, 631 const char *path); 632 struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info, 633 const u64 *devid, const u8 *uuid, 634 const char *path); 635 void btrfs_put_dev_args_from_path(struct btrfs_dev_lookup_args *args); 636 int btrfs_rm_device(struct btrfs_fs_info *fs_info, 637 struct btrfs_dev_lookup_args *args, 638 struct block_device **bdev, void **holder); 639 void __exit btrfs_cleanup_fs_uuids(void); 640 int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len); 641 int btrfs_grow_device(struct btrfs_trans_handle *trans, 642 struct btrfs_device *device, u64 new_size); 643 struct btrfs_device *btrfs_find_device(const struct btrfs_fs_devices *fs_devices, 644 const struct btrfs_dev_lookup_args *args); 645 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); 646 int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *path); 647 int btrfs_balance(struct btrfs_fs_info *fs_info, 648 struct btrfs_balance_control *bctl, 649 struct btrfs_ioctl_balance_args *bargs); 650 void btrfs_describe_block_groups(u64 flags, char *buf, u32 size_buf); 651 int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info); 652 int btrfs_recover_balance(struct btrfs_fs_info *fs_info); 653 int btrfs_pause_balance(struct btrfs_fs_info *fs_info); 654 int btrfs_relocate_chunk(struct btrfs_fs_info *fs_info, u64 chunk_offset); 655 int btrfs_cancel_balance(struct btrfs_fs_info *fs_info); 656 int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info); 657 int btrfs_uuid_scan_kthread(void *data); 658 bool btrfs_chunk_writeable(struct btrfs_fs_info *fs_info, u64 chunk_offset); 659 void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index); 660 int btrfs_get_dev_stats(struct btrfs_fs_info *fs_info, 661 struct btrfs_ioctl_get_dev_stats *stats); 662 int btrfs_init_devices_late(struct btrfs_fs_info *fs_info); 663 int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info); 664 int btrfs_run_dev_stats(struct btrfs_trans_handle *trans); 665 void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_device *srcdev); 666 void btrfs_rm_dev_replace_free_srcdev(struct btrfs_device *srcdev); 667 void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device *tgtdev); 668 int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info, 669 u64 logical, u64 len); 670 unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info, 671 u64 logical); 672 u64 btrfs_calc_stripe_length(const struct extent_map *em); 673 int btrfs_nr_parity_stripes(u64 type); 674 int btrfs_chunk_alloc_add_chunk_item(struct btrfs_trans_handle *trans, 675 struct btrfs_block_group *bg); 676 int btrfs_remove_chunk(struct btrfs_trans_handle *trans, u64 chunk_offset); 677 struct extent_map *btrfs_get_chunk_map(struct btrfs_fs_info *fs_info, 678 u64 logical, u64 length); 679 void btrfs_release_disk_super(struct btrfs_super_block *super); 680 681 static inline void btrfs_dev_stat_inc(struct btrfs_device *dev, 682 int index) 683 { 684 atomic_inc(dev->dev_stat_values + index); 685 /* 686 * This memory barrier orders stores updating statistics before stores 687 * updating dev_stats_ccnt. 688 * 689 * It pairs with smp_rmb() in btrfs_run_dev_stats(). 690 */ 691 smp_mb__before_atomic(); 692 atomic_inc(&dev->dev_stats_ccnt); 693 } 694 695 static inline int btrfs_dev_stat_read(struct btrfs_device *dev, 696 int index) 697 { 698 return atomic_read(dev->dev_stat_values + index); 699 } 700 701 static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev, 702 int index) 703 { 704 int ret; 705 706 ret = atomic_xchg(dev->dev_stat_values + index, 0); 707 /* 708 * atomic_xchg implies a full memory barriers as per atomic_t.txt: 709 * - RMW operations that have a return value are fully ordered; 710 * 711 * This implicit memory barriers is paired with the smp_rmb in 712 * btrfs_run_dev_stats 713 */ 714 atomic_inc(&dev->dev_stats_ccnt); 715 return ret; 716 } 717 718 static inline void btrfs_dev_stat_set(struct btrfs_device *dev, 719 int index, unsigned long val) 720 { 721 atomic_set(dev->dev_stat_values + index, val); 722 /* 723 * This memory barrier orders stores updating statistics before stores 724 * updating dev_stats_ccnt. 725 * 726 * It pairs with smp_rmb() in btrfs_run_dev_stats(). 727 */ 728 smp_mb__before_atomic(); 729 atomic_inc(&dev->dev_stats_ccnt); 730 } 731 732 static inline const char *btrfs_dev_name(const struct btrfs_device *device) 733 { 734 if (!device || test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state)) 735 return "<missing disk>"; 736 else 737 return rcu_str_deref(device->name); 738 } 739 740 void btrfs_commit_device_sizes(struct btrfs_transaction *trans); 741 742 struct list_head * __attribute_const__ btrfs_get_fs_uuids(void); 743 bool btrfs_check_rw_degradable(struct btrfs_fs_info *fs_info, 744 struct btrfs_device *failing_dev); 745 void btrfs_scratch_superblocks(struct btrfs_fs_info *fs_info, 746 struct block_device *bdev, 747 const char *device_path); 748 749 enum btrfs_raid_types __attribute_const__ btrfs_bg_flags_to_raid_index(u64 flags); 750 int btrfs_bg_type_to_factor(u64 flags); 751 const char *btrfs_bg_type_to_raid_name(u64 flags); 752 int btrfs_verify_dev_extents(struct btrfs_fs_info *fs_info); 753 bool btrfs_repair_one_zone(struct btrfs_fs_info *fs_info, u64 logical); 754 755 bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr); 756 u8 *btrfs_sb_fsid_ptr(struct btrfs_super_block *sb); 757 758 #endif 759