LXR linux/fs/btrfs/volumes.h

   1/*
   2 * Copyright (C) 2007 Oracle.  All rights reserved.
   3 *
   4 * This program is free software; you can redistribute it and/or
   5 * modify it under the terms of the GNU General Public
   6 * License v2 as published by the Free Software Foundation.
   7 *
   8 * This program is distributed in the hope that it will be useful,
   9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11 * General Public License for more details.
  12 *
  13 * You should have received a copy of the GNU General Public
  14 * License along with this program; if not, write to the
  15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16 * Boston, MA 021110-1307, USA.
  17 */
  18
  19#ifndef __BTRFS_VOLUMES_
  20#define __BTRFS_VOLUMES_
  21
  22#include <linux/bio.h>
  23#include <linux/sort.h>
  24#include <linux/btrfs.h>
  25#include "async-thread.h"
  26
  27#define BTRFS_STRIPE_LEN        (64 * 1024)
  28
  29struct buffer_head;
  30struct btrfs_pending_bios {
  31        struct bio *head;
  32        struct bio *tail;
  33};
  34
  35struct btrfs_device {
  36        struct list_head dev_list;
  37        struct list_head dev_alloc_list;
  38        struct btrfs_fs_devices *fs_devices;
  39        struct btrfs_root *dev_root;
  40
  41        /* regular prio bios */
  42        struct btrfs_pending_bios pending_bios;
  43        /* WRITE_SYNC bios */
  44        struct btrfs_pending_bios pending_sync_bios;
  45
  46        u64 generation;
  47        int running_pending;
  48        int writeable;
  49        int in_fs_metadata;
  50        int missing;
  51        int can_discard;
  52        int is_tgtdev_for_dev_replace;
  53
  54        spinlock_t io_lock;
  55        /* the mode sent to blkdev_get */
  56        fmode_t mode;
  57
  58        struct block_device *bdev;
  59
  60
  61        struct rcu_string *name;
  62
  63        /* the internal btrfs device id */
  64        u64 devid;
  65
  66        /* size of the device */
  67        u64 total_bytes;
  68
  69        /* size of the disk */
  70        u64 disk_total_bytes;
  71
  72        /* bytes used */
  73        u64 bytes_used;
  74
  75        /* optimal io alignment for this device */
  76        u32 io_align;
  77
  78        /* optimal io width for this device */
  79        u32 io_width;
  80        /* type and info about this device */
  81        u64 type;
  82
  83        /* minimal io size for this device */
  84        u32 sector_size;
  85
  86
  87        /* physical drive uuid (or lvm uuid) */
  88        u8 uuid[BTRFS_UUID_SIZE];
  89
  90        /* for sending down flush barriers */
  91        int nobarriers;
  92        struct bio *flush_bio;
  93        struct completion flush_wait;
  94
  95        /* per-device scrub information */
  96        struct scrub_ctx *scrub_device;
  97
  98        struct btrfs_work work;
  99        struct rcu_head rcu;
 100        struct work_struct rcu_work;
 101
 102        /* readahead state */
 103        spinlock_t reada_lock;
 104        atomic_t reada_in_flight;
 105        u64 reada_next;
 106        struct reada_zone *reada_curr_zone;
 107        struct radix_tree_root reada_zones;
 108        struct radix_tree_root reada_extents;
 109
 110
 111        /* disk I/O failure stats. For detailed description refer to
 112         * enum btrfs_dev_stat_values in ioctl.h */
 113        int dev_stats_valid;
 114        int dev_stats_dirty; /* counters need to be written to disk */
 115        atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
 116};
 117
 118struct btrfs_fs_devices {
 119        u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
 120
 121        /* the device with this id has the most recent copy of the super */
 122        u64 latest_devid;
 123        u64 latest_trans;
 124        u64 num_devices;
 125        u64 open_devices;
 126        u64 rw_devices;
 127        u64 missing_devices;
 128        u64 total_rw_bytes;
 129        u64 num_can_discard;
 130        u64 total_devices;
 131        struct block_device *latest_bdev;
 132
 133        /* all of the devices in the FS, protected by a mutex
 134         * so we can safely walk it to write out the supers without
 135         * worrying about add/remove by the multi-device code.
 136         * Scrubbing super can kick off supers writing by holding
 137         * this mutex lock.
 138         */
 139        struct mutex device_list_mutex;
 140        struct list_head devices;
 141
 142        /* devices not currently being allocated */
 143        struct list_head alloc_list;
 144        struct list_head list;
 145
 146        struct btrfs_fs_devices *seed;
 147        int seeding;
 148
 149        int opened;
 150
 151        /* set when we find or add a device that doesn't have the
 152         * nonrot flag set
 153         */
 154        int rotating;
 155};
 156
 157#define BTRFS_BIO_INLINE_CSUM_SIZE      64
 158
 159/*
 160 * we need the mirror number and stripe index to be passed around
 161 * the call chain while we are processing end_io (especially errors).
 162 * Really, what we need is a btrfs_bio structure that has this info
 163 * and is properly sized with its stripe array, but we're not there
 164 * quite yet.  We have our own btrfs bioset, and all of the bios
 165 * we allocate are actually btrfs_io_bios.  We'll cram as much of
 166 * struct btrfs_bio as we can into this over time.
 167 */
 168typedef void (btrfs_io_bio_end_io_t) (struct btrfs_io_bio *bio, int err);
 169struct btrfs_io_bio {
 170        unsigned long mirror_num;
 171        unsigned long stripe_index;
 172        u8 *csum;
 173        u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
 174        u8 *csum_allocated;
 175        btrfs_io_bio_end_io_t *end_io;
 176        struct bio bio;
 177};
 178
 179static inline struct btrfs_io_bio *btrfs_io_bio(struct bio *bio)
 180{
 181        return container_of(bio, struct btrfs_io_bio, bio);
 182}
 183
 184struct btrfs_bio_stripe {
 185        struct btrfs_device *dev;
 186        u64 physical;
 187        u64 length; /* only used for discard mappings */
 188};
 189
 190struct btrfs_bio;
 191typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
 192
 193struct btrfs_bio {
 194        atomic_t stripes_pending;
 195        bio_end_io_t *end_io;
 196        struct bio *orig_bio;
 197        void *private;
 198        atomic_t error;
 199        int max_errors;
 200        int num_stripes;
 201        int mirror_num;
 202        struct btrfs_bio_stripe stripes[];
 203};
 204
 205struct btrfs_device_info {
 206        struct btrfs_device *dev;
 207        u64 dev_offset;
 208        u64 max_avail;
 209        u64 total_avail;
 210};
 211
 212struct btrfs_raid_attr {
 213        int sub_stripes;        /* sub_stripes info for map */
 214        int dev_stripes;        /* stripes per dev */
 215        int devs_max;           /* max devs to use */
 216        int devs_min;           /* min devs needed */
 217        int devs_increment;     /* ndevs has to be a multiple of this */
 218        int ncopies;            /* how many copies to data has */
 219};
 220
 221struct map_lookup {
 222        u64 type;
 223        int io_align;
 224        int io_width;
 225        int stripe_len;
 226        int sector_size;
 227        int num_stripes;
 228        int sub_stripes;
 229        struct btrfs_bio_stripe stripes[];
 230};
 231
 232#define map_lookup_size(n) (sizeof(struct map_lookup) + \
 233                            (sizeof(struct btrfs_bio_stripe) * (n)))
 234
 235/*
 236 * Restriper's general type filter
 237 */
 238#define BTRFS_BALANCE_DATA              (1ULL << 0)
 239#define BTRFS_BALANCE_SYSTEM            (1ULL << 1)
 240#define BTRFS_BALANCE_METADATA          (1ULL << 2)
 241
 242#define BTRFS_BALANCE_TYPE_MASK         (BTRFS_BALANCE_DATA |       \
 243                                         BTRFS_BALANCE_SYSTEM |     \
 244                                         BTRFS_BALANCE_METADATA)
 245
 246#define BTRFS_BALANCE_FORCE             (1ULL << 3)
 247#define BTRFS_BALANCE_RESUME            (1ULL << 4)
 248
 249/*
 250 * Balance filters
 251 */
 252#define BTRFS_BALANCE_ARGS_PROFILES     (1ULL << 0)
 253#define BTRFS_BALANCE_ARGS_USAGE        (1ULL << 1)
 254#define BTRFS_BALANCE_ARGS_DEVID        (1ULL << 2)
 255#define BTRFS_BALANCE_ARGS_DRANGE       (1ULL << 3)
 256#define BTRFS_BALANCE_ARGS_VRANGE       (1ULL << 4)
 257
 258/*
 259 * Profile changing flags.  When SOFT is set we won't relocate chunk if
 260 * it already has the target profile (even though it may be
 261 * half-filled).
 262 */
 263#define BTRFS_BALANCE_ARGS_CONVERT      (1ULL << 8)
 264#define BTRFS_BALANCE_ARGS_SOFT         (1ULL << 9)
 265
 266struct btrfs_balance_args;
 267struct btrfs_balance_progress;
 268struct btrfs_balance_control {
 269        struct btrfs_fs_info *fs_info;
 270
 271        struct btrfs_balance_args data;
 272        struct btrfs_balance_args meta;
 273        struct btrfs_balance_args sys;
 274
 275        u64 flags;
 276
 277        struct btrfs_balance_progress stat;
 278};
 279
 280int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
 281                                   u64 end, u64 *length);
 282
 283#define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \
 284                            (sizeof(struct btrfs_bio_stripe) * (n)))
 285
 286int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
 287                    u64 logical, u64 *length,
 288                    struct btrfs_bio **bbio_ret, int mirror_num);
 289int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
 290                     u64 chunk_start, u64 physical, u64 devid,
 291                     u64 **logical, int *naddrs, int *stripe_len);
 292int btrfs_read_sys_array(struct btrfs_root *root);
 293int btrfs_read_chunk_tree(struct btrfs_root *root);
 294int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 295                      struct btrfs_root *extent_root, u64 type);
 296void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
 297void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
 298int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
 299                  int mirror_num, int async_submit);
 300int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
 301                       fmode_t flags, void *holder);
 302int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
 303                          struct btrfs_fs_devices **fs_devices_ret);
 304int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
 305void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info,
 306                               struct btrfs_fs_devices *fs_devices, int step);
 307int btrfs_find_device_missing_or_by_path(struct btrfs_root *root,
 308                                         char *device_path,
 309                                         struct btrfs_device **device);
 310struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
 311                                        const u64 *devid,
 312                                        const u8 *uuid);
 313int btrfs_rm_device(struct btrfs_root *root, char *device_path);
 314void btrfs_cleanup_fs_uuids(void);
 315int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
 316int btrfs_grow_device(struct btrfs_trans_handle *trans,
 317                      struct btrfs_device *device, u64 new_size);
 318struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
 319                                       u8 *uuid, u8 *fsid);
 320int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
 321int btrfs_init_new_device(struct btrfs_root *root, char *path);
 322int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path,
 323                                  struct btrfs_device **device_out);
 324int btrfs_balance(struct btrfs_balance_control *bctl,
 325                  struct btrfs_ioctl_balance_args *bargs);
 326int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
 327int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
 328int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
 329int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
 330int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
 331int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info);
 332int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
 333int find_free_dev_extent(struct btrfs_trans_handle *trans,
 334                         struct btrfs_device *device, u64 num_bytes,
 335                         u64 *start, u64 *max_avail);
 336void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
 337int btrfs_get_dev_stats(struct btrfs_root *root,
 338                        struct btrfs_ioctl_get_dev_stats *stats);
 339void btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
 340int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
 341int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
 342                        struct btrfs_fs_info *fs_info);
 343void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
 344                                 struct btrfs_device *srcdev);
 345void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
 346                                      struct btrfs_device *tgtdev);
 347void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
 348                                              struct btrfs_device *tgtdev);
 349int btrfs_scratch_superblock(struct btrfs_device *device);
 350int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree,
 351                           u64 logical, u64 len, int mirror_num);
 352unsigned long btrfs_full_stripe_len(struct btrfs_root *root,
 353                                    struct btrfs_mapping_tree *map_tree,
 354                                    u64 logical);
 355int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
 356                                struct btrfs_root *extent_root,
 357                                u64 chunk_offset, u64 chunk_size);
 358static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
 359                                      int index)
 360{
 361        atomic_inc(dev->dev_stat_values + index);
 362        dev->dev_stats_dirty = 1;
 363}
 364
 365static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
 366                                      int index)
 367{
 368        return atomic_read(dev->dev_stat_values + index);
 369}
 370
 371static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
 372                                                int index)
 373{
 374        int ret;
 375
 376        ret = atomic_xchg(dev->dev_stat_values + index, 0);
 377        dev->dev_stats_dirty = 1;
 378        return ret;
 379}
 380
 381static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
 382                                      int index, unsigned long val)
 383{
 384        atomic_set(dev->dev_stat_values + index, val);
 385        dev->dev_stats_dirty = 1;
 386}
 387
 388static inline void btrfs_dev_stat_reset(struct btrfs_device *dev,
 389                                        int index)
 390{
 391        btrfs_dev_stat_set(dev, index, 0);
 392}
 393#endif
 394