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
  29 struct buffer_head;
  30 struct btrfs_pending_bios {
  31         struct bio *head;
  32         struct bio *tail;
  33 };
  34
  35 struct 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
 118 struct 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  */
 164 struct btrfs_io_bio {
 165         unsigned long mirror_num;
 166         unsigned long stripe_index;
 167         struct bio bio;
 168 };
 169
 170 static inline struct btrfs_io_bio *btrfs_io_bio(struct bio *bio)
 171 {
 172         return container_of(bio, struct btrfs_io_bio, bio);
 173 }
 174
 175 struct btrfs_bio_stripe {
 176         struct btrfs_device *dev;
 177         u64 physical;
 178         u64 length; /* only used for discard mappings */
 179 };
 180
 181 struct btrfs_bio;
 182 typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
 183
 184 struct 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
 196 struct btrfs_device_info {
 197         struct btrfs_device *dev;
 198         u64 dev_offset;
 199         u64 max_avail;
 200         u64 total_avail;
 201 };
 202
 203 struct 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
 212 struct 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
 257 struct btrfs_balance_args;
 258 struct btrfs_balance_progress;
 259 struct 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
 271 int 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
 277 int 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);
 280 int 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);
 283 int btrfs_read_sys_array(struct btrfs_root *root);
 284 int btrfs_read_chunk_tree(struct btrfs_root *root);
 285 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 286                       struct btrfs_root *extent_root, u64 type);
 287 void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
 288 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
 289 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
 290                   int mirror_num, int async_submit);
 291 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
 292                        fmode_t flags, void *holder);
 293 int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
 294                           struct btrfs_fs_devices **fs_devices_ret);
 295 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
 296 void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info,
 297                                struct btrfs_fs_devices *fs_devices, int step);
 298 int btrfs_find_device_missing_or_by_path(struct btrfs_root *root,
 299                                          char *device_path,
 300                                          struct btrfs_device **device);
 301 int btrfs_rm_device(struct btrfs_root *root, char *device_path);
 302 void btrfs_cleanup_fs_uuids(void);
 303 int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
 304 int btrfs_grow_device(struct btrfs_trans_handle *trans,
 305                       struct btrfs_device *device, u64 new_size);
 306 struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
 307                                        u8 *uuid, u8 *fsid);
 308 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
 309 int btrfs_init_new_device(struct btrfs_root *root, char *path);
 310 int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path,
 311                                   struct btrfs_device **device_out);
 312 int btrfs_balance(struct btrfs_balance_control *bctl,
 313                   struct btrfs_ioctl_balance_args *bargs);
 314 int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
 315 int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
 316 int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
 317 int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
 318 int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
 319 int find_free_dev_extent(struct btrfs_trans_handle *trans,
 320                          struct btrfs_device *device, u64 num_bytes,
 321                          u64 *start, u64 *max_avail);
 322 void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
 323 int btrfs_get_dev_stats(struct btrfs_root *root,
 324                         struct btrfs_ioctl_get_dev_stats *stats);
 325 void btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
 326 int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
 327 int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
 328                         struct btrfs_fs_info *fs_info);
 329 void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
 330                                  struct btrfs_device *srcdev);
 331 void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
 332                                       struct btrfs_device *tgtdev);
 333 void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
 334                                               struct btrfs_device *tgtdev);
 335 int btrfs_scratch_superblock(struct btrfs_device *device);
 336 int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree,
 337                            u64 logical, u64 len, int mirror_num);
 338 unsigned long btrfs_full_stripe_len(struct btrfs_root *root,
 339                                     struct btrfs_mapping_tree *map_tree,
 340                                     u64 logical);
 341 int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
 342                                 struct btrfs_root *extent_root,
 343                                 u64 chunk_offset, u64 chunk_size);
 344 static 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
 351 static 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
 357 static 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
 367 static 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
 374 static 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