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        int running_pending;
  47        u64 generation;
  48
  49        int writeable;
  50        int in_fs_metadata;
  51        int missing;
  52        int can_discard;
  53        int is_tgtdev_for_dev_replace;
  54
  55        spinlock_t io_lock;
  56
  57        struct block_device *bdev;
  58
  59        /* the mode sent to blkdev_get */
  60        fmode_t mode;
  61
  62        struct rcu_string *name;
  63
  64        /* the internal btrfs device id */
  65        u64 devid;
  66
  67        /* size of the device */
  68        u64 total_bytes;
  69
  70        /* size of the disk */
  71        u64 disk_total_bytes;
  72
  73        /* bytes used */
  74        u64 bytes_used;
  75
  76        /* optimal io alignment for this device */
  77        u32 io_align;
  78
  79        /* optimal io width for this device */
  80        u32 io_width;
  81
  82        /* minimal io size for this device */
  83        u32 sector_size;
  84
  85        /* type and info about this device */
  86        u64 type;
  87
  88        /* physical drive uuid (or lvm uuid) */
  89        u8 uuid[BTRFS_UUID_SIZE];
  90
  91        /* per-device scrub information */
  92        struct scrub_ctx *scrub_device;
  93
  94        struct btrfs_work work;
  95        struct rcu_head rcu;
  96        struct work_struct rcu_work;
  97
  98        /* readahead state */
  99        spinlock_t reada_lock;
 100        atomic_t reada_in_flight;
 101        u64 reada_next;
 102        struct reada_zone *reada_curr_zone;
 103        struct radix_tree_root reada_zones;
 104        struct radix_tree_root reada_extents;
 105
 106        /* for sending down flush barriers */
 107        struct bio *flush_bio;
 108        struct completion flush_wait;
 109        int nobarriers;
 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         */
 137        struct mutex device_list_mutex;
 138        struct list_head devices;
 139
 140        /* devices not currently being allocated */
 141        struct list_head alloc_list;
 142        struct list_head list;
 143
 144        struct btrfs_fs_devices *seed;
 145        int seeding;
 146
 147        int opened;
 148
 149        /* set when we find or add a device that doesn't have the
 150         * nonrot flag set
 151         */
 152        int rotating;
 153};
 154
 155#define BTRFS_BIO_INLINE_CSUM_SIZE      64
 156
 157/*
 158 * we need the mirror number and stripe index to be passed around
 159 * the call chain while we are processing end_io (especially errors).
 160 * Really, what we need is a btrfs_bio structure that has this info
 161 * and is properly sized with its stripe array, but we're not there
 162 * quite yet.  We have our own btrfs bioset, and all of the bios
 163 * we allocate are actually btrfs_io_bios.  We'll cram as much of
 164 * struct btrfs_bio as we can into this over time.
 165 */
 166typedef void (btrfs_io_bio_end_io_t) (struct btrfs_io_bio *bio, int err);
 167struct btrfs_io_bio {
 168        unsigned long mirror_num;
 169        unsigned long stripe_index;
 170        u8 *csum;
 171        u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
 172        u8 *csum_allocated;
 173        btrfs_io_bio_end_io_t *end_io;
 174        struct bio bio;
 175};
 176
 177static inline struct btrfs_io_bio *btrfs_io_bio(struct bio *bio)
 178{
 179        return container_of(bio, struct btrfs_io_bio, bio);
 180}
 181
 182struct btrfs_bio_stripe {
 183        struct btrfs_device *dev;
 184        u64 physical;
 185        u64 length; /* only used for discard mappings */
 186};
 187
 188struct btrfs_bio;
 189typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
 190
 191struct btrfs_bio {
 192        atomic_t stripes_pending;
 193        bio_end_io_t *end_io;
 194        struct bio *orig_bio;
 195        void *private;
 196        atomic_t error;
 197        int max_errors;
 198        int num_stripes;
 199        int mirror_num;
 200        struct btrfs_bio_stripe stripes[];
 201};
 202
 203struct btrfs_device_info {
 204        struct btrfs_device *dev;
 205        u64 dev_offset;
 206        u64 max_avail;
 207        u64 total_avail;
 208};
 209
 210struct btrfs_raid_attr {
 211        int sub_stripes;        /* sub_stripes info for map */
 212        int dev_stripes;        /* stripes per dev */
 213        int devs_max;           /* max devs to use */
 214        int devs_min;           /* min devs needed */
 215        int devs_increment;     /* ndevs has to be a multiple of this */
 216        int ncopies;            /* how many copies to data has */
 217};
 218
 219struct map_lookup {
 220        u64 type;
 221        int io_align;
 222        int io_width;
 223        int stripe_len;
 224        int sector_size;
 225        int num_stripes;
 226        int sub_stripes;
 227        struct btrfs_bio_stripe stripes[];
 228};
 229
 230#define map_lookup_size(n) (sizeof(struct map_lookup) + \
 231                            (sizeof(struct btrfs_bio_stripe) * (n)))
 232
 233/*
 234 * Restriper's general type filter
 235 */
 236#define BTRFS_BALANCE_DATA              (1ULL << 0)
 237#define BTRFS_BALANCE_SYSTEM            (1ULL << 1)
 238#define BTRFS_BALANCE_METADATA          (1ULL << 2)
 239
 240#define BTRFS_BALANCE_TYPE_MASK         (BTRFS_BALANCE_DATA |       \
 241                                         BTRFS_BALANCE_SYSTEM |     \
 242                                         BTRFS_BALANCE_METADATA)
 243
 244#define BTRFS_BALANCE_FORCE             (1ULL << 3)
 245#define BTRFS_BALANCE_RESUME            (1ULL << 4)
 246
 247/*
 248 * Balance filters
 249 */
 250#define BTRFS_BALANCE_ARGS_PROFILES     (1ULL << 0)
 251#define BTRFS_BALANCE_ARGS_USAGE        (1ULL << 1)
 252#define BTRFS_BALANCE_ARGS_DEVID        (1ULL << 2)
 253#define BTRFS_BALANCE_ARGS_DRANGE       (1ULL << 3)
 254#define BTRFS_BALANCE_ARGS_VRANGE       (1ULL << 4)
 255
 256/*
 257 * Profile changing flags.  When SOFT is set we won't relocate chunk if
 258 * it already has the target profile (even though it may be
 259 * half-filled).
 260 */
 261#define BTRFS_BALANCE_ARGS_CONVERT      (1ULL << 8)
 262#define BTRFS_BALANCE_ARGS_SOFT         (1ULL << 9)
 263
 264struct btrfs_balance_args;
 265struct btrfs_balance_progress;
 266struct btrfs_balance_control {
 267        struct btrfs_fs_info *fs_info;
 268
 269        struct btrfs_balance_args data;
 270        struct btrfs_balance_args meta;
 271        struct btrfs_balance_args sys;
 272
 273        u64 flags;
 274
 275        struct btrfs_balance_progress stat;
 276};
 277
 278int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
 279                                   u64 end, u64 *length);
 280
 281#define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \
 282                            (sizeof(struct btrfs_bio_stripe) * (n)))
 283
 284int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
 285                    u64 logical, u64 *length,
 286                    struct btrfs_bio **bbio_ret, int mirror_num);
 287int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
 288                     u64 chunk_start, u64 physical, u64 devid,
 289                     u64 **logical, int *naddrs, int *stripe_len);
 290int btrfs_read_sys_array(struct btrfs_root *root);
 291int btrfs_read_chunk_tree(struct btrfs_root *root);
 292int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 293                      struct btrfs_root *extent_root, u64 type);
 294void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
 295void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
 296int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
 297                  int mirror_num, int async_submit);
 298int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
 299                       fmode_t flags, void *holder);
 300int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
 301                          struct btrfs_fs_devices **fs_devices_ret);
 302int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
 303void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info,
 304                               struct btrfs_fs_devices *fs_devices, int step);
 305int btrfs_find_device_missing_or_by_path(struct btrfs_root *root,
 306                                         char *device_path,
 307                                         struct btrfs_device **device);
 308struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
 309                                        const u64 *devid,
 310                                        const u8 *uuid);
 311int btrfs_rm_device(struct btrfs_root *root, char *device_path);
 312void btrfs_cleanup_fs_uuids(void);
 313int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
 314int btrfs_grow_device(struct btrfs_trans_handle *trans,
 315                      struct btrfs_device *device, u64 new_size);
 316struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
 317                                       u8 *uuid, u8 *fsid);
 318int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
 319int btrfs_init_new_device(struct btrfs_root *root, char *path);
 320int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path,
 321                                  struct btrfs_device **device_out);
 322int btrfs_balance(struct btrfs_balance_control *bctl,
 323                  struct btrfs_ioctl_balance_args *bargs);
 324int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
 325int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
 326int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
 327int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
 328int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
 329int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info);
 330int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
 331int find_free_dev_extent(struct btrfs_trans_handle *trans,
 332                         struct btrfs_device *device, u64 num_bytes,
 333                         u64 *start, u64 *max_avail);
 334void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
 335int btrfs_get_dev_stats(struct btrfs_root *root,
 336                        struct btrfs_ioctl_get_dev_stats *stats);
 337void btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
 338int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
 339int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
 340                        struct btrfs_fs_info *fs_info);
 341void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
 342                                 struct btrfs_device *srcdev);
 343void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
 344                                      struct btrfs_device *tgtdev);
 345void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
 346                                              struct btrfs_device *tgtdev);
 347int btrfs_scratch_superblock(struct btrfs_device *device);
 348int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree,
 349                           u64 logical, u64 len, int mirror_num);
 350unsigned long btrfs_full_stripe_len(struct btrfs_root *root,
 351                                    struct btrfs_mapping_tree *map_tree,
 352                                    u64 logical);
 353int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
 354                                struct btrfs_root *extent_root,
 355                                u64 chunk_offset, u64 chunk_size);
 356static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
 357                                      int index)
 358{
 359        atomic_inc(dev->dev_stat_values + index);
 360        dev->dev_stats_dirty = 1;
 361}
 362
 363static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
 364                                      int index)
 365{
 366        return atomic_read(dev->dev_stat_values + index);
 367}
 368
 369static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
 370                                                int index)
 371{
 372        int ret;
 373
 374        ret = atomic_xchg(dev->dev_stat_values + index, 0);
 375        dev->dev_stats_dirty = 1;
 376        return ret;
 377}
 378
 379static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
 380                                      int index, unsigned long val)
 381{
 382        atomic_set(dev->dev_stat_values + index, val);
 383        dev->dev_stats_dirty = 1;
 384}
 385
 386static inline void btrfs_dev_stat_reset(struct btrfs_device *dev,
 387                                        int index)
 388{
 389        btrfs_dev_stat_set(dev, index, 0);
 390}
 391#endif
 392