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 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 }; 116 117 struct 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 }; 153 154 struct btrfs_bio_stripe { 155 struct btrfs_device *dev; 156 u64 physical; 157 u64 length; /* only used for discard mappings */ 158 }; 159 160 struct btrfs_bio; 161 typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err); 162 163 struct 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 }; 174 175 struct btrfs_device_info { 176 struct btrfs_device *dev; 177 u64 dev_offset; 178 u64 max_avail; 179 u64 total_avail; 180 }; 181 182 struct 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) 226 227 struct btrfs_balance_args; 228 struct btrfs_balance_progress; 229 struct 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 }; 240 241 int 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))) 246 247 int 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); 251 int 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); 254 int 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); 257 int btrfs_read_sys_array(struct btrfs_root *root); 258 int btrfs_read_chunk_tree(struct btrfs_root *root); 259 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, 260 struct btrfs_root *extent_root, u64 type); 261 void btrfs_mapping_init(struct btrfs_mapping_tree *tree); 262 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree); 263 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, 264 int mirror_num, int async_submit); 265 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, 266 fmode_t flags, void *holder); 267 int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, 268 struct btrfs_fs_devices **fs_devices_ret); 269 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); 270 void btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices); 271 int btrfs_add_device(struct btrfs_trans_handle *trans, 272 struct btrfs_root *root, 273 struct btrfs_device *device); 274 int btrfs_rm_device(struct btrfs_root *root, char *device_path); 275 void btrfs_cleanup_fs_uuids(void); 276 int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len); 277 int btrfs_grow_device(struct btrfs_trans_handle *trans, 278 struct btrfs_device *device, u64 new_size); 279 struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, 280 u8 *uuid, u8 *fsid); 281 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); 282 int btrfs_init_new_device(struct btrfs_root *root, char *path); 283 int btrfs_balance(struct btrfs_balance_control *bctl, 284 struct btrfs_ioctl_balance_args *bargs); 285 int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info); 286 int btrfs_recover_balance(struct btrfs_fs_info *fs_info); 287 int btrfs_pause_balance(struct btrfs_fs_info *fs_info); 288 int btrfs_cancel_balance(struct btrfs_fs_info *fs_info); 289 int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset); 290 int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes, 291 u64 *start, u64 *max_avail); 292 void btrfs_dev_stat_print_on_error(struct btrfs_device *device); 293 void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index); 294 int btrfs_get_dev_stats(struct btrfs_root *root, 295 struct btrfs_ioctl_get_dev_stats *stats); 296 int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info); 297 int btrfs_run_dev_stats(struct btrfs_trans_handle *trans, 298 struct btrfs_fs_info *fs_info); 299 300 static 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 } 306 307 static inline int btrfs_dev_stat_read(struct btrfs_device *dev, 308 int index) 309 { 310 return atomic_read(dev->dev_stat_values + index); 311 } 312 313 static 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 } 322 323 static 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 } 329 330 static 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