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/*
 156 * we need the mirror number and stripe index to be passed around
 157 * the call chain while we are processing end_io (especially errors).
 158 * Really, what we need is a btrfs_bio structure that has this info
 159 * and is properly sized with its stripe array, but we're not there
 160 * quite yet.  We have our own btrfs bioset, and all of the bios
 161 * we allocate are actually btrfs_io_bios.  We'll cram as much of
 162 * struct btrfs_bio as we can into this over time.
 163 */
 164struct btrfs_io_bio {
 165        unsigned long mirror_num;
 166        unsigned long stripe_index;
 167        struct bio bio;
 168};
 169
 170static inline struct btrfs_io_bio *btrfs_io_bio(struct bio *bio)
 171{
 172        return container_of(bio, struct btrfs_io_bio, bio);
 173}
 174
 175struct btrfs_bio_stripe {
 176        struct btrfs_device *dev;
 177        u64 physical;
 178        u64 length; /* only used for discard mappings */
 179};
 180
 181struct btrfs_bio;
 182typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
 183
 184struct btrfs_bio {
 185        atomic_t stripes_pending;
 186        bio_end_io_t *end_io;
 187        struct bio *orig_bio;
 188        void *private;
 189        atomic_t error;
 190        int max_errors;
 191        int num_stripes;
 192        int mirror_num;
 193        struct btrfs_bio_stripe stripes[];
 194};
 195
 196struct btrfs_device_info {
 197        struct btrfs_device *dev;
 198        u64 dev_offset;
 199        u64 max_avail;
 200        u64 total_avail;
 201};
 202
 203struct btrfs_raid_attr {
 204        int sub_stripes;        /* sub_stripes info for map */
 205        int dev_stripes;        /* stripes per dev */
 206        int devs_max;           /* max devs to use */
 207        int devs_min;           /* min devs needed */
 208        int devs_increment;     /* ndevs has to be a multiple of this */
 209        int ncopies;            /* how many copies to data has */
 210};
 211
 212struct map_lookup {
 213        u64 type;
 214        int io_align;
 215        int io_width;
 216        int stripe_len;
 217        int sector_size;
 218        int num_stripes;
 219        int sub_stripes;
 220        struct btrfs_bio_stripe stripes[];
 221};
 222
 223#define map_lookup_size(n) (sizeof(struct map_lookup) + \
 224                            (sizeof(struct btrfs_bio_stripe) * (n)))
 225
 226/*
 227 * Restriper's general type filter
 228 */
 229#define BTRFS_BALANCE_DATA              (1ULL << 0)
 230#define BTRFS_BALANCE_SYSTEM            (1ULL << 1)
 231#define BTRFS_BALANCE_METADATA          (1ULL << 2)
 232
 233#define BTRFS_BALANCE_TYPE_MASK         (BTRFS_BALANCE_DATA |       \
 234                                         BTRFS_BALANCE_SYSTEM |     \
 235                                         BTRFS_BALANCE_METADATA)
 236
 237#define BTRFS_BALANCE_FORCE             (1ULL << 3)
 238#define BTRFS_BALANCE_RESUME            (1ULL << 4)
 239
 240/*
 241 * Balance filters
 242 */
 243#define BTRFS_BALANCE_ARGS_PROFILES     (1ULL << 0)
 244#define BTRFS_BALANCE_ARGS_USAGE        (1ULL << 1)
 245#define BTRFS_BALANCE_ARGS_DEVID        (1ULL << 2)
 246#define BTRFS_BALANCE_ARGS_DRANGE       (1ULL << 3)
 247#define BTRFS_BALANCE_ARGS_VRANGE       (1ULL << 4)
 248
 249/*
 250 * Profile changing flags.  When SOFT is set we won't relocate chunk if
 251 * it already has the target profile (even though it may be
 252 * half-filled).
 253 */
 254#define BTRFS_BALANCE_ARGS_CONVERT      (1ULL << 8)
 255#define BTRFS_BALANCE_ARGS_SOFT         (1ULL << 9)
 256
 257struct btrfs_balance_args;
 258struct btrfs_balance_progress;
 259struct btrfs_balance_control {
 260        struct btrfs_fs_info *fs_info;
 261
 262        struct btrfs_balance_args data;
 263        struct btrfs_balance_args meta;
 264        struct btrfs_balance_args sys;
 265
 266        u64 flags;
 267
 268        struct btrfs_balance_progress stat;
 269};
 270
 271int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
 272                                   u64 end, u64 *length);
 273
 274#define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \
 275                            (sizeof(struct btrfs_bio_stripe) * (n)))
 276
 277int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
 278                    u64 logical, u64 *length,
 279                    struct btrfs_bio **bbio_ret, int mirror_num);
 280int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
 281                     u64 chunk_start, u64 physical, u64 devid,
 282                     u64 **logical, int *naddrs, int *stripe_len);
 283int btrfs_read_sys_array(struct btrfs_root *root);
 284int btrfs_read_chunk_tree(struct btrfs_root *root);
 285int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 286                      struct btrfs_root *extent_root, u64 type);
 287void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
 288void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
 289int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
 290                  int mirror_num, int async_submit);
 291int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
 292                       fmode_t flags, void *holder);
 293int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
 294                          struct btrfs_fs_devices **fs_devices_ret);
 295int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
 296void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info,
 297                               struct btrfs_fs_devices *fs_devices, int step);
 298int btrfs_find_device_missing_or_by_path(struct btrfs_root *root,
 299                                         char *device_path,
 300                                         struct btrfs_device **device);
 301int btrfs_rm_device(struct btrfs_root *root, char *device_path);
 302void btrfs_cleanup_fs_uuids(void);
 303int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
 304int btrfs_grow_device(struct btrfs_trans_handle *trans,
 305                      struct btrfs_device *device, u64 new_size);
 306struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
 307                                       u8 *uuid, u8 *fsid);
 308int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
 309int btrfs_init_new_device(struct btrfs_root *root, char *path);
 310int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path,
 311                                  struct btrfs_device **device_out);
 312int btrfs_balance(struct btrfs_balance_control *bctl,
 313                  struct btrfs_ioctl_balance_args *bargs);
 314int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
 315int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
 316int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
 317int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
 318int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
 319int find_free_dev_extent(struct btrfs_trans_handle *trans,
 320                         struct btrfs_device *device, u64 num_bytes,
 321                         u64 *start, u64 *max_avail);
 322void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
 323int btrfs_get_dev_stats(struct btrfs_root *root,
 324                        struct btrfs_ioctl_get_dev_stats *stats);
 325void btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
 326int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
 327int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
 328                        struct btrfs_fs_info *fs_info);
 329void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
 330                                 struct btrfs_device *srcdev);
 331void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
 332                                      struct btrfs_device *tgtdev);
 333void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
 334                                              struct btrfs_device *tgtdev);
 335int btrfs_scratch_superblock(struct btrfs_device *device);
 336int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree,
 337                           u64 logical, u64 len, int mirror_num);
 338unsigned long btrfs_full_stripe_len(struct btrfs_root *root,
 339                                    struct btrfs_mapping_tree *map_tree,
 340                                    u64 logical);
 341int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
 342                                struct btrfs_root *extent_root,
 343                                u64 chunk_offset, u64 chunk_size);
 344static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
 345                                      int index)
 346{
 347        atomic_inc(dev->dev_stat_values + index);
 348        dev->dev_stats_dirty = 1;
 349}
 350
 351static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
 352                                      int index)
 353{
 354        return atomic_read(dev->dev_stat_values + index);
 355}
 356
 357static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
 358                                                int index)
 359{
 360        int ret;
 361
 362        ret = atomic_xchg(dev->dev_stat_values + index, 0);
 363        dev->dev_stats_dirty = 1;
 364        return ret;
 365}
 366
 367static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
 368                                      int index, unsigned long val)
 369{
 370        atomic_set(dev->dev_stat_values + index, val);
 371        dev->dev_stats_dirty = 1;
 372}
 373
 374static inline void btrfs_dev_stat_reset(struct btrfs_device *dev,
 375                                        int index)
 376{
 377        btrfs_dev_stat_set(dev, index, 0);
 378}
 379#endif
 380