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 "async-thread.h"
  25#include "ioctl.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
  54        spinlock_t io_lock;
  55
  56        struct block_device *bdev;
  57
  58        /* the mode sent to blkdev_get */
  59        fmode_t mode;
  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
  81        /* minimal io size for this device */
  82        u32 sector_size;
  83
  84        /* type and info about this device */
  85        u64 type;
  86
  87        /* physical drive uuid (or lvm uuid) */
  88        u8 uuid[BTRFS_UUID_SIZE];
  89
  90        /* per-device scrub information */
  91        struct scrub_dev *scrub_device;
  92
  93        struct btrfs_work work;
  94        struct rcu_head rcu;
  95        struct work_struct rcu_work;
  96
  97        /* readahead state */
  98        spinlock_t reada_lock;
  99        atomic_t reada_in_flight;
 100        u64 reada_next;
 101        struct reada_zone *reada_curr_zone;
 102        struct radix_tree_root reada_zones;
 103        struct radix_tree_root reada_extents;
 104
 105        /* for sending down flush barriers */
 106        struct bio *flush_bio;
 107        struct completion flush_wait;
 108        int nobarriers;
 109
 110        /* disk I/O failure stats. For detailed description refer to
 111         * enum btrfs_dev_stat_values in ioctl.h */
 112        int dev_stats_valid;
 113        int dev_stats_dirty; /* counters need to be written to disk */
 114        atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
 115};
 116
 117struct btrfs_fs_devices {
 118        u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
 119
 120        /* the device with this id has the most recent copy of the super */
 121        u64 latest_devid;
 122        u64 latest_trans;
 123        u64 num_devices;
 124        u64 open_devices;
 125        u64 rw_devices;
 126        u64 missing_devices;
 127        u64 total_rw_bytes;
 128        u64 num_can_discard;
 129        u64 total_devices;
 130        struct block_device *latest_bdev;
 131
 132        /* all of the devices in the FS, protected by a mutex
 133         * so we can safely walk it to write out the supers without
 134         * worrying about add/remove by the multi-device code
 135         */
 136        struct mutex device_list_mutex;
 137        struct list_head devices;
 138
 139        /* devices not currently being allocated */
 140        struct list_head alloc_list;
 141        struct list_head list;
 142
 143        struct btrfs_fs_devices *seed;
 144        int seeding;
 145
 146        int opened;
 147
 148        /* set when we find or add a device that doesn't have the
 149         * nonrot flag set
 150         */
 151        int rotating;
 152};
 153
 154struct btrfs_bio_stripe {
 155        struct btrfs_device *dev;
 156        u64 physical;
 157        u64 length; /* only used for discard mappings */
 158};
 159
 160struct btrfs_bio;
 161typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
 162
 163struct btrfs_bio {
 164        atomic_t stripes_pending;
 165        bio_end_io_t *end_io;
 166        struct bio *orig_bio;
 167        void *private;
 168        atomic_t error;
 169        int max_errors;
 170        int num_stripes;
 171        int mirror_num;
 172        struct btrfs_bio_stripe stripes[];
 173};
 174
 175struct btrfs_device_info {
 176        struct btrfs_device *dev;
 177        u64 dev_offset;
 178        u64 max_avail;
 179        u64 total_avail;
 180};
 181
 182struct map_lookup {
 183        u64 type;
 184        int io_align;
 185        int io_width;
 186        int stripe_len;
 187        int sector_size;
 188        int num_stripes;
 189        int sub_stripes;
 190        struct btrfs_bio_stripe stripes[];
 191};
 192
 193#define map_lookup_size(n) (sizeof(struct map_lookup) + \
 194                            (sizeof(struct btrfs_bio_stripe) * (n)))
 195
 196/*
 197 * Restriper's general type filter
 198 */
 199#define BTRFS_BALANCE_DATA              (1ULL << 0)
 200#define BTRFS_BALANCE_SYSTEM            (1ULL << 1)
 201#define BTRFS_BALANCE_METADATA          (1ULL << 2)
 202
 203#define BTRFS_BALANCE_TYPE_MASK         (BTRFS_BALANCE_DATA |       \
 204                                         BTRFS_BALANCE_SYSTEM |     \
 205                                         BTRFS_BALANCE_METADATA)
 206
 207#define BTRFS_BALANCE_FORCE             (1ULL << 3)
 208#define BTRFS_BALANCE_RESUME            (1ULL << 4)
 209
 210/*
 211 * Balance filters
 212 */
 213#define BTRFS_BALANCE_ARGS_PROFILES     (1ULL << 0)
 214#define BTRFS_BALANCE_ARGS_USAGE        (1ULL << 1)
 215#define BTRFS_BALANCE_ARGS_DEVID        (1ULL << 2)
 216#define BTRFS_BALANCE_ARGS_DRANGE       (1ULL << 3)
 217#define BTRFS_BALANCE_ARGS_VRANGE       (1ULL << 4)
 218
 219/*
 220 * Profile changing flags.  When SOFT is set we won't relocate chunk if
 221 * it already has the target profile (even though it may be
 222 * half-filled).
 223 */
 224#define BTRFS_BALANCE_ARGS_CONVERT      (1ULL << 8)
 225#define BTRFS_BALANCE_ARGS_SOFT         (1ULL << 9)
 226
 227struct btrfs_balance_args;
 228struct btrfs_balance_progress;
 229struct btrfs_balance_control {
 230        struct btrfs_fs_info *fs_info;
 231
 232        struct btrfs_balance_args data;
 233        struct btrfs_balance_args meta;
 234        struct btrfs_balance_args sys;
 235
 236        u64 flags;
 237
 238        struct btrfs_balance_progress stat;
 239};
 240
 241int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
 242                                   u64 end, u64 *length);
 243
 244#define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \
 245                            (sizeof(struct btrfs_bio_stripe) * (n)))
 246
 247int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
 248                           struct btrfs_device *device,
 249                           u64 chunk_tree, u64 chunk_objectid,
 250                           u64 chunk_offset, u64 start, u64 num_bytes);
 251int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
 252                    u64 logical, u64 *length,
 253                    struct btrfs_bio **bbio_ret, int mirror_num);
 254int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
 255                     u64 chunk_start, u64 physical, u64 devid,
 256                     u64 **logical, int *naddrs, int *stripe_len);
 257int btrfs_read_sys_array(struct btrfs_root *root);
 258int btrfs_read_chunk_tree(struct btrfs_root *root);
 259int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 260                      struct btrfs_root *extent_root, u64 type);
 261void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
 262void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
 263int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
 264                  int mirror_num, int async_submit);
 265int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
 266                       fmode_t flags, void *holder);
 267int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
 268                          struct btrfs_fs_devices **fs_devices_ret);
 269int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
 270void btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices);
 271int btrfs_add_device(struct btrfs_trans_handle *trans,
 272                     struct btrfs_root *root,
 273                     struct btrfs_device *device);
 274int btrfs_rm_device(struct btrfs_root *root, char *device_path);
 275void btrfs_cleanup_fs_uuids(void);
 276int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
 277int btrfs_grow_device(struct btrfs_trans_handle *trans,
 278                      struct btrfs_device *device, u64 new_size);
 279struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
 280                                       u8 *uuid, u8 *fsid);
 281int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
 282int btrfs_init_new_device(struct btrfs_root *root, char *path);
 283int btrfs_balance(struct btrfs_balance_control *bctl,
 284                  struct btrfs_ioctl_balance_args *bargs);
 285int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
 286int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
 287int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
 288int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
 289int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
 290int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes,
 291                         u64 *start, u64 *max_avail);
 292void btrfs_dev_stat_print_on_error(struct btrfs_device *device);
 293void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
 294int btrfs_get_dev_stats(struct btrfs_root *root,
 295                        struct btrfs_ioctl_get_dev_stats *stats);
 296int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
 297int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
 298                        struct btrfs_fs_info *fs_info);
 299
 300static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
 301                                      int index)
 302{
 303        atomic_inc(dev->dev_stat_values + index);
 304        dev->dev_stats_dirty = 1;
 305}
 306
 307static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
 308                                      int index)
 309{
 310        return atomic_read(dev->dev_stat_values + index);
 311}
 312
 313static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
 314                                                int index)
 315{
 316        int ret;
 317
 318        ret = atomic_xchg(dev->dev_stat_values + index, 0);
 319        dev->dev_stats_dirty = 1;
 320        return ret;
 321}
 322
 323static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
 324                                      int index, unsigned long val)
 325{
 326        atomic_set(dev->dev_stat_values + index, val);
 327        dev->dev_stats_dirty = 1;
 328}
 329
 330static inline void btrfs_dev_stat_reset(struct btrfs_device *dev,
 331                                        int index)
 332{
 333        btrfs_dev_stat_set(dev, index, 0);
 334}
 335#endif
 336