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 #define BTRFS_BIO_INLINE_CSUM_SIZE 64 156 157 /* 158 * we need the mirror number and stripe index to be passed around 159 * the call chain while we are processing end_io (especially errors). 160 * Really, what we need is a btrfs_bio structure that has this info 161 * and is properly sized with its stripe array, but we're not there 162 * quite yet. We have our own btrfs bioset, and all of the bios 163 * we allocate are actually btrfs_io_bios. We'll cram as much of 164 * struct btrfs_bio as we can into this over time. 165 */ 166 typedef void (btrfs_io_bio_end_io_t) (struct btrfs_io_bio *bio, int err); 167 struct btrfs_io_bio { 168 unsigned long mirror_num; 169 unsigned long stripe_index; 170 u8 *csum; 171 u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE]; 172 u8 *csum_allocated; 173 btrfs_io_bio_end_io_t *end_io; 174 struct bio bio; 175 }; 176 177 static inline struct btrfs_io_bio *btrfs_io_bio(struct bio *bio) 178 { 179 return container_of(bio, struct btrfs_io_bio, bio); 180 } 181 182 struct btrfs_bio_stripe { 183 struct btrfs_device *dev; 184 u64 physical; 185 u64 length; /* only used for discard mappings */ 186 }; 187 188 struct btrfs_bio; 189 typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err); 190 191 struct btrfs_bio { 192 atomic_t stripes_pending; 193 bio_end_io_t *end_io; 194 struct bio *orig_bio; 195 void *private; 196 atomic_t error; 197 int max_errors; 198 int num_stripes; 199 int mirror_num; 200 struct btrfs_bio_stripe stripes[]; 201 }; 202 203 struct btrfs_device_info { 204 struct btrfs_device *dev; 205 u64 dev_offset; 206 u64 max_avail; 207 u64 total_avail; 208 }; 209 210 struct btrfs_raid_attr { 211 int sub_stripes; /* sub_stripes info for map */ 212 int dev_stripes; /* stripes per dev */ 213 int devs_max; /* max devs to use */ 214 int devs_min; /* min devs needed */ 215 int devs_increment; /* ndevs has to be a multiple of this */ 216 int ncopies; /* how many copies to data has */ 217 }; 218 219 struct map_lookup { 220 u64 type; 221 int io_align; 222 int io_width; 223 int stripe_len; 224 int sector_size; 225 int num_stripes; 226 int sub_stripes; 227 struct btrfs_bio_stripe stripes[]; 228 }; 229 230 #define map_lookup_size(n) (sizeof(struct map_lookup) + \ 231 (sizeof(struct btrfs_bio_stripe) * (n))) 232 233 /* 234 * Restriper's general type filter 235 */ 236 #define BTRFS_BALANCE_DATA (1ULL << 0) 237 #define BTRFS_BALANCE_SYSTEM (1ULL << 1) 238 #define BTRFS_BALANCE_METADATA (1ULL << 2) 239 240 #define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA | \ 241 BTRFS_BALANCE_SYSTEM | \ 242 BTRFS_BALANCE_METADATA) 243 244 #define BTRFS_BALANCE_FORCE (1ULL << 3) 245 #define BTRFS_BALANCE_RESUME (1ULL << 4) 246 247 /* 248 * Balance filters 249 */ 250 #define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0) 251 #define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1) 252 #define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2) 253 #define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3) 254 #define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4) 255 256 /* 257 * Profile changing flags. When SOFT is set we won't relocate chunk if 258 * it already has the target profile (even though it may be 259 * half-filled). 260 */ 261 #define BTRFS_BALANCE_ARGS_CONVERT (1ULL << 8) 262 #define BTRFS_BALANCE_ARGS_SOFT (1ULL << 9) 263 264 struct btrfs_balance_args; 265 struct btrfs_balance_progress; 266 struct btrfs_balance_control { 267 struct btrfs_fs_info *fs_info; 268 269 struct btrfs_balance_args data; 270 struct btrfs_balance_args meta; 271 struct btrfs_balance_args sys; 272 273 u64 flags; 274 275 struct btrfs_balance_progress stat; 276 }; 277 278 int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start, 279 u64 end, u64 *length); 280 281 #define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \ 282 (sizeof(struct btrfs_bio_stripe) * (n))) 283 284 int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw, 285 u64 logical, u64 *length, 286 struct btrfs_bio **bbio_ret, int mirror_num); 287 int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, 288 u64 chunk_start, u64 physical, u64 devid, 289 u64 **logical, int *naddrs, int *stripe_len); 290 int btrfs_read_sys_array(struct btrfs_root *root); 291 int btrfs_read_chunk_tree(struct btrfs_root *root); 292 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, 293 struct btrfs_root *extent_root, u64 type); 294 void btrfs_mapping_init(struct btrfs_mapping_tree *tree); 295 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree); 296 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, 297 int mirror_num, int async_submit); 298 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, 299 fmode_t flags, void *holder); 300 int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, 301 struct btrfs_fs_devices **fs_devices_ret); 302 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); 303 void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info, 304 struct btrfs_fs_devices *fs_devices, int step); 305 int btrfs_find_device_missing_or_by_path(struct btrfs_root *root, 306 char *device_path, 307 struct btrfs_device **device); 308 struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info, 309 const u64 *devid, 310 const u8 *uuid); 311 int btrfs_rm_device(struct btrfs_root *root, char *device_path); 312 void btrfs_cleanup_fs_uuids(void); 313 int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len); 314 int btrfs_grow_device(struct btrfs_trans_handle *trans, 315 struct btrfs_device *device, u64 new_size); 316 struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid, 317 u8 *uuid, u8 *fsid); 318 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); 319 int btrfs_init_new_device(struct btrfs_root *root, char *path); 320 int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path, 321 struct btrfs_device **device_out); 322 int btrfs_balance(struct btrfs_balance_control *bctl, 323 struct btrfs_ioctl_balance_args *bargs); 324 int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info); 325 int btrfs_recover_balance(struct btrfs_fs_info *fs_info); 326 int btrfs_pause_balance(struct btrfs_fs_info *fs_info); 327 int btrfs_cancel_balance(struct btrfs_fs_info *fs_info); 328 int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info); 329 int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info); 330 int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset); 331 int find_free_dev_extent(struct btrfs_trans_handle *trans, 332 struct btrfs_device *device, u64 num_bytes, 333 u64 *start, u64 *max_avail); 334 void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index); 335 int btrfs_get_dev_stats(struct btrfs_root *root, 336 struct btrfs_ioctl_get_dev_stats *stats); 337 void btrfs_init_devices_late(struct btrfs_fs_info *fs_info); 338 int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info); 339 int btrfs_run_dev_stats(struct btrfs_trans_handle *trans, 340 struct btrfs_fs_info *fs_info); 341 void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info, 342 struct btrfs_device *srcdev); 343 void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info, 344 struct btrfs_device *tgtdev); 345 void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info, 346 struct btrfs_device *tgtdev); 347 int btrfs_scratch_superblock(struct btrfs_device *device); 348 int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree, 349 u64 logical, u64 len, int mirror_num); 350 unsigned long btrfs_full_stripe_len(struct btrfs_root *root, 351 struct btrfs_mapping_tree *map_tree, 352 u64 logical); 353 int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans, 354 struct btrfs_root *extent_root, 355 u64 chunk_offset, u64 chunk_size); 356 static inline void btrfs_dev_stat_inc(struct btrfs_device *dev, 357 int index) 358 { 359 atomic_inc(dev->dev_stat_values + index); 360 dev->dev_stats_dirty = 1; 361 } 362 363 static inline int btrfs_dev_stat_read(struct btrfs_device *dev, 364 int index) 365 { 366 return atomic_read(dev->dev_stat_values + index); 367 } 368 369 static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev, 370 int index) 371 { 372 int ret; 373 374 ret = atomic_xchg(dev->dev_stat_values + index, 0); 375 dev->dev_stats_dirty = 1; 376 return ret; 377 } 378 379 static inline void btrfs_dev_stat_set(struct btrfs_device *dev, 380 int index, unsigned long val) 381 { 382 atomic_set(dev->dev_stat_values + index, val); 383 dev->dev_stats_dirty = 1; 384 } 385 386 static inline void btrfs_dev_stat_reset(struct btrfs_device *dev, 387 int index) 388 { 389 btrfs_dev_stat_set(dev, index, 0); 390 } 391 #endif 392