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