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