fs/btrfs/volumes.h

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
btrfs_io_bio_free_csum
btrfs_op
btrfs_dev_stat_inc
btrfs_dev_stat_read
btrfs_dev_stat_read_and_reset
btrfs_dev_stat_set
btrfs_bg_flags_to_raid_index
   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 
  16 extern struct mutex uuid_mutex;
  17 
  18 #define BTRFS_STRIPE_LEN        SZ_64K
  19 
  20 struct buffer_head;
  21 struct btrfs_pending_bios {
  22         struct bio *head;
  23         struct bio *tail;
  24 };
  25 
  26 struct btrfs_io_geometry {
  27         /* remaining bytes before crossing a stripe */
  28         u64 len;
  29         /* offset of logical address in chunk */
  30         u64 offset;
  31         /* length of single IO stripe */
  32         u64 stripe_len;
  33         /* number of stripe where address falls */
  34         u64 stripe_nr;
  35         /* offset of address in stripe */
  36         u64 stripe_offset;
  37         /* offset of raid56 stripe into the chunk */
  38         u64 raid56_stripe_offset;
  39 };
  40 
  41 /*
  42  * Use sequence counter to get consistent device stat data on
  43  * 32-bit processors.
  44  */
  45 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
  46 #include <linux/seqlock.h>
  47 #define __BTRFS_NEED_DEVICE_DATA_ORDERED
  48 #define btrfs_device_data_ordered_init(device)  \
  49         seqcount_init(&device->data_seqcount)
  50 #else
  51 #define btrfs_device_data_ordered_init(device) do { } while (0)
  52 #endif
  53 
  54 #define BTRFS_DEV_STATE_WRITEABLE       (0)
  55 #define BTRFS_DEV_STATE_IN_FS_METADATA  (1)
  56 #define BTRFS_DEV_STATE_MISSING         (2)
  57 #define BTRFS_DEV_STATE_REPLACE_TGT     (3)
  58 #define BTRFS_DEV_STATE_FLUSH_SENT      (4)
  59 
  60 struct btrfs_device {
  61         struct list_head dev_list; /* device_list_mutex */
  62         struct list_head dev_alloc_list; /* chunk mutex */
  63         struct list_head post_commit_list; /* chunk mutex */
  64         struct btrfs_fs_devices *fs_devices;
  65         struct btrfs_fs_info *fs_info;
  66 
  67         struct rcu_string *name;
  68 
  69         u64 generation;
  70 
  71         spinlock_t io_lock ____cacheline_aligned;
  72         int running_pending;
  73         /* regular prio bios */
  74         struct btrfs_pending_bios pending_bios;
  75         /* sync bios */
  76         struct btrfs_pending_bios pending_sync_bios;
  77 
  78         struct block_device *bdev;
  79 
  80         /* the mode sent to blkdev_get */
  81         fmode_t mode;
  82 
  83         unsigned long dev_state;
  84         blk_status_t last_flush_error;
  85 
  86 #ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED
  87         seqcount_t data_seqcount;
  88 #endif
  89 
  90         /* the internal btrfs device id */
  91         u64 devid;
  92 
  93         /* size of the device in memory */
  94         u64 total_bytes;
  95 
  96         /* size of the device on disk */
  97         u64 disk_total_bytes;
  98 
  99         /* bytes used */
 100         u64 bytes_used;
 101 
 102         /* optimal io alignment for this device */
 103         u32 io_align;
 104 
 105         /* optimal io width for this device */
 106         u32 io_width;
 107         /* type and info about this device */
 108         u64 type;
 109 
 110         /* minimal io size for this device */
 111         u32 sector_size;
 112 
 113         /* physical drive uuid (or lvm uuid) */
 114         u8 uuid[BTRFS_UUID_SIZE];
 115 
 116         /*
 117          * size of the device on the current transaction
 118          *
 119          * This variant is update when committing the transaction,
 120          * and protected by chunk mutex
 121          */
 122         u64 commit_total_bytes;
 123 
 124         /* bytes used on the current transaction */
 125         u64 commit_bytes_used;
 126 
 127         /* for sending down flush barriers */
 128         struct bio *flush_bio;
 129         struct completion flush_wait;
 130 
 131         /* per-device scrub information */
 132         struct scrub_ctx *scrub_ctx;
 133 
 134         struct btrfs_work work;
 135 
 136         /* readahead state */
 137         atomic_t reada_in_flight;
 138         u64 reada_next;
 139         struct reada_zone *reada_curr_zone;
 140         struct radix_tree_root reada_zones;
 141         struct radix_tree_root reada_extents;
 142 
 143         /* disk I/O failure stats. For detailed description refer to
 144          * enum btrfs_dev_stat_values in ioctl.h */
 145         int dev_stats_valid;
 146 
 147         /* Counter to record the change of device stats */
 148         atomic_t dev_stats_ccnt;
 149         atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
 150 
 151         struct extent_io_tree alloc_state;
 152 };
 153 
 154 /*
 155  * If we read those variants at the context of their own lock, we needn't
 156  * use the following helpers, reading them directly is safe.
 157  */
 158 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
 159 #define BTRFS_DEVICE_GETSET_FUNCS(name)                                 \
 160 static inline u64                                                       \
 161 btrfs_device_get_##name(const struct btrfs_device *dev)                 \
 162 {                                                                       \
 163         u64 size;                                                       \
 164         unsigned int seq;                                               \
 165                                                                         \
 166         do {                                                            \
 167                 seq = read_seqcount_begin(&dev->data_seqcount);         \
 168                 size = dev->name;                                       \
 169         } while (read_seqcount_retry(&dev->data_seqcount, seq));        \
 170         return size;                                                    \
 171 }                                                                       \
 172                                                                         \
 173 static inline void                                                      \
 174 btrfs_device_set_##name(struct btrfs_device *dev, u64 size)             \
 175 {                                                                       \
 176         preempt_disable();                                              \
 177         write_seqcount_begin(&dev->data_seqcount);                      \
 178         dev->name = size;                                               \
 179         write_seqcount_end(&dev->data_seqcount);                        \
 180         preempt_enable();                                               \
 181 }
 182 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
 183 #define BTRFS_DEVICE_GETSET_FUNCS(name)                                 \
 184 static inline u64                                                       \
 185 btrfs_device_get_##name(const struct btrfs_device *dev)                 \
 186 {                                                                       \
 187         u64 size;                                                       \
 188                                                                         \
 189         preempt_disable();                                              \
 190         size = dev->name;                                               \
 191         preempt_enable();                                               \
 192         return size;                                                    \
 193 }                                                                       \
 194                                                                         \
 195 static inline void                                                      \
 196 btrfs_device_set_##name(struct btrfs_device *dev, u64 size)             \
 197 {                                                                       \
 198         preempt_disable();                                              \
 199         dev->name = size;                                               \
 200         preempt_enable();                                               \
 201 }
 202 #else
 203 #define BTRFS_DEVICE_GETSET_FUNCS(name)                                 \
 204 static inline u64                                                       \
 205 btrfs_device_get_##name(const struct btrfs_device *dev)                 \
 206 {                                                                       \
 207         return dev->name;                                               \
 208 }                                                                       \
 209                                                                         \
 210 static inline void                                                      \
 211 btrfs_device_set_##name(struct btrfs_device *dev, u64 size)             \
 212 {                                                                       \
 213         dev->name = size;                                               \
 214 }
 215 #endif
 216 
 217 BTRFS_DEVICE_GETSET_FUNCS(total_bytes);
 218 BTRFS_DEVICE_GETSET_FUNCS(disk_total_bytes);
 219 BTRFS_DEVICE_GETSET_FUNCS(bytes_used);
 220 
 221 struct btrfs_fs_devices {
 222         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
 223         u8 metadata_uuid[BTRFS_FSID_SIZE];
 224         bool fsid_change;
 225         struct list_head fs_list;
 226 
 227         u64 num_devices;
 228         u64 open_devices;
 229         u64 rw_devices;
 230         u64 missing_devices;
 231         u64 total_rw_bytes;
 232         u64 total_devices;
 233 
 234         /* Highest generation number of seen devices */
 235         u64 latest_generation;
 236 
 237         struct block_device *latest_bdev;
 238 
 239         /* all of the devices in the FS, protected by a mutex
 240          * so we can safely walk it to write out the supers without
 241          * worrying about add/remove by the multi-device code.
 242          * Scrubbing super can kick off supers writing by holding
 243          * this mutex lock.
 244          */
 245         struct mutex device_list_mutex;
 246 
 247         /* List of all devices, protected by device_list_mutex */
 248         struct list_head devices;
 249 
 250         /*
 251          * Devices which can satisfy space allocation. Protected by
 252          * chunk_mutex
 253          */
 254         struct list_head alloc_list;
 255 
 256         struct btrfs_fs_devices *seed;
 257         int seeding;
 258 
 259         int opened;
 260 
 261         /* set when we find or add a device that doesn't have the
 262          * nonrot flag set
 263          */
 264         int rotating;
 265 
 266         struct btrfs_fs_info *fs_info;
 267         /* sysfs kobjects */
 268         struct kobject fsid_kobj;
 269         struct kobject *device_dir_kobj;
 270         struct completion kobj_unregister;
 271 };
 272 
 273 #define BTRFS_BIO_INLINE_CSUM_SIZE      64
 274 
 275 #define BTRFS_MAX_DEVS(info) ((BTRFS_MAX_ITEM_SIZE(info)        \
 276                         - sizeof(struct btrfs_chunk))           \
 277                         / sizeof(struct btrfs_stripe) + 1)
 278 
 279 #define BTRFS_MAX_DEVS_SYS_CHUNK ((BTRFS_SYSTEM_CHUNK_ARRAY_SIZE        \
 280                                 - 2 * sizeof(struct btrfs_disk_key)     \
 281                                 - 2 * sizeof(struct btrfs_chunk))       \
 282                                 / sizeof(struct btrfs_stripe) + 1)
 283 
 284 /*
 285  * we need the mirror number and stripe index to be passed around
 286  * the call chain while we are processing end_io (especially errors).
 287  * Really, what we need is a btrfs_bio structure that has this info
 288  * and is properly sized with its stripe array, but we're not there
 289  * quite yet.  We have our own btrfs bioset, and all of the bios
 290  * we allocate are actually btrfs_io_bios.  We'll cram as much of
 291  * struct btrfs_bio as we can into this over time.
 292  */
 293 struct btrfs_io_bio {
 294         unsigned int mirror_num;
 295         unsigned int stripe_index;
 296         u64 logical;
 297         u8 *csum;
 298         u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
 299         struct bvec_iter iter;
 300         /*
 301          * This member must come last, bio_alloc_bioset will allocate enough
 302          * bytes for entire btrfs_io_bio but relies on bio being last.
 303          */
 304         struct bio bio;
 305 };
 306 
 307 static inline struct btrfs_io_bio *btrfs_io_bio(struct bio *bio)
 308 {
 309         return container_of(bio, struct btrfs_io_bio, bio);
 310 }
 311 
 312 static inline void btrfs_io_bio_free_csum(struct btrfs_io_bio *io_bio)
 313 {
 314         if (io_bio->csum != io_bio->csum_inline) {
 315                 kfree(io_bio->csum);
 316                 io_bio->csum = NULL;
 317         }
 318 }
 319 
 320 struct btrfs_bio_stripe {
 321         struct btrfs_device *dev;
 322         u64 physical;
 323         u64 length; /* only used for discard mappings */
 324 };
 325 
 326 struct btrfs_bio {
 327         refcount_t refs;
 328         atomic_t stripes_pending;
 329         struct btrfs_fs_info *fs_info;
 330         u64 map_type; /* get from map_lookup->type */
 331         bio_end_io_t *end_io;
 332         struct bio *orig_bio;
 333         void *private;
 334         atomic_t error;
 335         int max_errors;
 336         int num_stripes;
 337         int mirror_num;
 338         int num_tgtdevs;
 339         int *tgtdev_map;
 340         /*
 341          * logical block numbers for the start of each stripe
 342          * The last one or two are p/q.  These are sorted,
 343          * so raid_map[0] is the start of our full stripe
 344          */
 345         u64 *raid_map;
 346         struct btrfs_bio_stripe stripes[];
 347 };
 348 
 349 struct btrfs_device_info {
 350         struct btrfs_device *dev;
 351         u64 dev_offset;
 352         u64 max_avail;
 353         u64 total_avail;
 354 };
 355 
 356 struct btrfs_raid_attr {
 357         u8 sub_stripes;         /* sub_stripes info for map */
 358         u8 dev_stripes;         /* stripes per dev */
 359         u8 devs_max;            /* max devs to use */
 360         u8 devs_min;            /* min devs needed */
 361         u8 tolerated_failures;  /* max tolerated fail devs */
 362         u8 devs_increment;      /* ndevs has to be a multiple of this */
 363         u8 ncopies;             /* how many copies to data has */
 364         u8 nparity;             /* number of stripes worth of bytes to store
 365                                  * parity information */
 366         u8 mindev_error;        /* error code if min devs requisite is unmet */
 367         const char raid_name[8]; /* name of the raid */
 368         u64 bg_flag;            /* block group flag of the raid */
 369 };
 370 
 371 extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES];
 372 
 373 struct map_lookup {
 374         u64 type;
 375         int io_align;
 376         int io_width;
 377         u64 stripe_len;
 378         int num_stripes;
 379         int sub_stripes;
 380         int verified_stripes; /* For mount time dev extent verification */
 381         struct btrfs_bio_stripe stripes[];
 382 };
 383 
 384 #define map_lookup_size(n) (sizeof(struct map_lookup) + \
 385                             (sizeof(struct btrfs_bio_stripe) * (n)))
 386 
 387 struct btrfs_balance_args;
 388 struct btrfs_balance_progress;
 389 struct btrfs_balance_control {
 390         struct btrfs_balance_args data;
 391         struct btrfs_balance_args meta;
 392         struct btrfs_balance_args sys;
 393 
 394         u64 flags;
 395 
 396         struct btrfs_balance_progress stat;
 397 };
 398 
 399 enum btrfs_map_op {
 400         BTRFS_MAP_READ,
 401         BTRFS_MAP_WRITE,
 402         BTRFS_MAP_DISCARD,
 403         BTRFS_MAP_GET_READ_MIRRORS,
 404 };
 405 
 406 static inline enum btrfs_map_op btrfs_op(struct bio *bio)
 407 {
 408         switch (bio_op(bio)) {
 409         case REQ_OP_DISCARD:
 410                 return BTRFS_MAP_DISCARD;
 411         case REQ_OP_WRITE:
 412                 return BTRFS_MAP_WRITE;
 413         default:
 414                 WARN_ON_ONCE(1);
 415                 /* fall through */
 416         case REQ_OP_READ:
 417                 return BTRFS_MAP_READ;
 418         }
 419 }
 420 
 421 void btrfs_get_bbio(struct btrfs_bio *bbio);
 422 void btrfs_put_bbio(struct btrfs_bio *bbio);
 423 int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
 424                     u64 logical, u64 *length,
 425                     struct btrfs_bio **bbio_ret, int mirror_num);
 426 int btrfs_map_sblock(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
 427                      u64 logical, u64 *length,
 428                      struct btrfs_bio **bbio_ret);
 429 int btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
 430                 u64 logical, u64 len, struct btrfs_io_geometry *io_geom);
 431 int btrfs_rmap_block(struct btrfs_fs_info *fs_info, u64 chunk_start,
 432                      u64 physical, u64 **logical, int *naddrs, int *stripe_len);
 433 int btrfs_read_sys_array(struct btrfs_fs_info *fs_info);
 434 int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info);
 435 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, u64 type);
 436 void btrfs_mapping_tree_free(struct extent_map_tree *tree);
 437 blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
 438                            int mirror_num, int async_submit);
 439 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
 440                        fmode_t flags, void *holder);
 441 struct btrfs_device *btrfs_scan_one_device(const char *path,
 442                                            fmode_t flags, void *holder);
 443 int btrfs_forget_devices(const char *path);
 444 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
 445 void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices, int step);
 446 void btrfs_assign_next_active_device(struct btrfs_device *device,
 447                                      struct btrfs_device *this_dev);
 448 struct btrfs_device *btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info,
 449                                                   u64 devid,
 450                                                   const char *devpath);
 451 struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
 452                                         const u64 *devid,
 453                                         const u8 *uuid);
 454 void btrfs_free_device(struct btrfs_device *device);
 455 int btrfs_rm_device(struct btrfs_fs_info *fs_info,
 456                     const char *device_path, u64 devid);
 457 void __exit btrfs_cleanup_fs_uuids(void);
 458 int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
 459 int btrfs_grow_device(struct btrfs_trans_handle *trans,
 460                       struct btrfs_device *device, u64 new_size);
 461 struct btrfs_device *btrfs_find_device(struct btrfs_fs_devices *fs_devices,
 462                                        u64 devid, u8 *uuid, u8 *fsid, bool seed);
 463 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
 464 int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *path);
 465 int btrfs_balance(struct btrfs_fs_info *fs_info,
 466                   struct btrfs_balance_control *bctl,
 467                   struct btrfs_ioctl_balance_args *bargs);
 468 void btrfs_describe_block_groups(u64 flags, char *buf, u32 size_buf);
 469 int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
 470 int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
 471 int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
 472 int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
 473 int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
 474 int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info);
 475 int btrfs_chunk_readonly(struct btrfs_fs_info *fs_info, u64 chunk_offset);
 476 int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes,
 477                          u64 *start, u64 *max_avail);
 478 void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
 479 int btrfs_get_dev_stats(struct btrfs_fs_info *fs_info,
 480                         struct btrfs_ioctl_get_dev_stats *stats);
 481 void btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
 482 int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
 483 int btrfs_run_dev_stats(struct btrfs_trans_handle *trans);
 484 void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_device *srcdev);
 485 void btrfs_rm_dev_replace_free_srcdev(struct btrfs_device *srcdev);
 486 void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device *tgtdev);
 487 void btrfs_scratch_superblocks(struct block_device *bdev, const char *device_path);
 488 int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info,
 489                            u64 logical, u64 len);
 490 unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
 491                                     u64 logical);
 492 int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
 493                              u64 chunk_offset, u64 chunk_size);
 494 int btrfs_remove_chunk(struct btrfs_trans_handle *trans, u64 chunk_offset);
 495 struct extent_map *btrfs_get_chunk_map(struct btrfs_fs_info *fs_info,
 496                                        u64 logical, u64 length);
 497 
 498 static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
 499                                       int index)
 500 {
 501         atomic_inc(dev->dev_stat_values + index);
 502         /*
 503          * This memory barrier orders stores updating statistics before stores
 504          * updating dev_stats_ccnt.
 505          *
 506          * It pairs with smp_rmb() in btrfs_run_dev_stats().
 507          */
 508         smp_mb__before_atomic();
 509         atomic_inc(&dev->dev_stats_ccnt);
 510 }
 511 
 512 static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
 513                                       int index)
 514 {
 515         return atomic_read(dev->dev_stat_values + index);
 516 }
 517 
 518 static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
 519                                                 int index)
 520 {
 521         int ret;
 522 
 523         ret = atomic_xchg(dev->dev_stat_values + index, 0);
 524         /*
 525          * atomic_xchg implies a full memory barriers as per atomic_t.txt:
 526          * - RMW operations that have a return value are fully ordered;
 527          *
 528          * This implicit memory barriers is paired with the smp_rmb in
 529          * btrfs_run_dev_stats
 530          */
 531         atomic_inc(&dev->dev_stats_ccnt);
 532         return ret;
 533 }
 534 
 535 static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
 536                                       int index, unsigned long val)
 537 {
 538         atomic_set(dev->dev_stat_values + index, val);
 539         /*
 540          * This memory barrier orders stores updating statistics before stores
 541          * updating dev_stats_ccnt.
 542          *
 543          * It pairs with smp_rmb() in btrfs_run_dev_stats().
 544          */
 545         smp_mb__before_atomic();
 546         atomic_inc(&dev->dev_stats_ccnt);
 547 }
 548 
 549 /*
 550  * Convert block group flags (BTRFS_BLOCK_GROUP_*) to btrfs_raid_types, which
 551  * can be used as index to access btrfs_raid_array[].
 552  */
 553 static inline enum btrfs_raid_types btrfs_bg_flags_to_raid_index(u64 flags)
 554 {
 555         if (flags & BTRFS_BLOCK_GROUP_RAID10)
 556                 return BTRFS_RAID_RAID10;
 557         else if (flags & BTRFS_BLOCK_GROUP_RAID1)
 558                 return BTRFS_RAID_RAID1;
 559         else if (flags & BTRFS_BLOCK_GROUP_DUP)
 560                 return BTRFS_RAID_DUP;
 561         else if (flags & BTRFS_BLOCK_GROUP_RAID0)
 562                 return BTRFS_RAID_RAID0;
 563         else if (flags & BTRFS_BLOCK_GROUP_RAID5)
 564                 return BTRFS_RAID_RAID5;
 565         else if (flags & BTRFS_BLOCK_GROUP_RAID6)
 566                 return BTRFS_RAID_RAID6;
 567 
 568         return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */
 569 }
 570 
 571 void btrfs_commit_device_sizes(struct btrfs_transaction *trans);
 572 
 573 struct list_head *btrfs_get_fs_uuids(void);
 574 void btrfs_set_fs_info_ptr(struct btrfs_fs_info *fs_info);
 575 void btrfs_reset_fs_info_ptr(struct btrfs_fs_info *fs_info);
 576 bool btrfs_check_rw_degradable(struct btrfs_fs_info *fs_info,
 577                                         struct btrfs_device *failing_dev);
 578 
 579 int btrfs_bg_type_to_factor(u64 flags);
 580 const char *btrfs_bg_type_to_raid_name(u64 flags);
 581 int btrfs_verify_dev_extents(struct btrfs_fs_info *fs_info);
 582 
 583 #endif
/* [<][>][^][v][top][bottom][index][help] */
root/fs/btrfs/volumes.h

INCLUDED FROM

DEFINITIONS
