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 26 #define BTRFS_STRIPE_LEN (64 * 1024) 27 28 struct buffer_head; 29 struct btrfs_pending_bios { 30 struct bio *head; 31 struct bio *tail; 32 }; 33 34 struct btrfs_device { 35 struct list_head dev_list; 36 struct list_head dev_alloc_list; 37 struct btrfs_fs_devices *fs_devices; 38 struct btrfs_root *dev_root; 39 40 /* regular prio bios */ 41 struct btrfs_pending_bios pending_bios; 42 /* WRITE_SYNC bios */ 43 struct btrfs_pending_bios pending_sync_bios; 44 45 int running_pending; 46 u64 generation; 47 48 int writeable; 49 int in_fs_metadata; 50 int missing; 51 int can_discard; 52 53 spinlock_t io_lock; 54 55 struct block_device *bdev; 56 57 /* the mode sent to blkdev_get */ 58 fmode_t mode; 59 60 char *name; 61 62 /* the internal btrfs device id */ 63 u64 devid; 64 65 /* size of the device */ 66 u64 total_bytes; 67 68 /* size of the disk */ 69 u64 disk_total_bytes; 70 71 /* bytes used */ 72 u64 bytes_used; 73 74 /* optimal io alignment for this device */ 75 u32 io_align; 76 77 /* optimal io width for this device */ 78 u32 io_width; 79 80 /* minimal io size for this device */ 81 u32 sector_size; 82 83 /* type and info about this device */ 84 u64 type; 85 86 /* physical drive uuid (or lvm uuid) */ 87 u8 uuid[BTRFS_UUID_SIZE]; 88 89 /* per-device scrub information */ 90 struct scrub_dev *scrub_device; 91 92 struct btrfs_work work; 93 struct rcu_head rcu; 94 struct work_struct rcu_work; 95 96 /* readahead state */ 97 spinlock_t reada_lock; 98 atomic_t reada_in_flight; 99 u64 reada_next; 100 struct reada_zone *reada_curr_zone; 101 struct radix_tree_root reada_zones; 102 struct radix_tree_root reada_extents; 103 104 /* for sending down flush barriers */ 105 struct bio *flush_bio; 106 struct completion flush_wait; 107 int nobarriers; 108 109 }; 110 111 struct btrfs_fs_devices { 112 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 113 114 /* the device with this id has the most recent copy of the super */ 115 u64 latest_devid; 116 u64 latest_trans; 117 u64 num_devices; 118 u64 open_devices; 119 u64 rw_devices; 120 u64 missing_devices; 121 u64 total_rw_bytes; 122 u64 num_can_discard; 123 struct block_device *latest_bdev; 124 125 /* all of the devices in the FS, protected by a mutex 126 * so we can safely walk it to write out the supers without 127 * worrying about add/remove by the multi-device code 128 */ 129 struct mutex device_list_mutex; 130 struct list_head devices; 131 132 /* devices not currently being allocated */ 133 struct list_head alloc_list; 134 struct list_head list; 135 136 struct btrfs_fs_devices *seed; 137 int seeding; 138 139 int opened; 140 141 /* set when we find or add a device that doesn't have the 142 * nonrot flag set 143 */ 144 int rotating; 145 }; 146 147 struct btrfs_bio_stripe { 148 struct btrfs_device *dev; 149 u64 physical; 150 u64 length; /* only used for discard mappings */ 151 }; 152 153 struct btrfs_bio; 154 typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err); 155 156 struct btrfs_bio { 157 atomic_t stripes_pending; 158 bio_end_io_t *end_io; 159 struct bio *orig_bio; 160 void *private; 161 atomic_t error; 162 int max_errors; 163 int num_stripes; 164 int mirror_num; 165 struct btrfs_bio_stripe stripes[]; 166 }; 167 168 struct btrfs_device_info { 169 struct btrfs_device *dev; 170 u64 dev_offset; 171 u64 max_avail; 172 u64 total_avail; 173 }; 174 175 struct map_lookup { 176 u64 type; 177 int io_align; 178 int io_width; 179 int stripe_len; 180 int sector_size; 181 int num_stripes; 182 int sub_stripes; 183 struct btrfs_bio_stripe stripes[]; 184 }; 185 186 #define map_lookup_size(n) (sizeof(struct map_lookup) + \ 187 (sizeof(struct btrfs_bio_stripe) * (n))) 188 189 /* 190 * Restriper's general type filter 191 */ 192 #define BTRFS_BALANCE_DATA (1ULL << 0) 193 #define BTRFS_BALANCE_SYSTEM (1ULL << 1) 194 #define BTRFS_BALANCE_METADATA (1ULL << 2) 195 196 #define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA | \ 197 BTRFS_BALANCE_SYSTEM | \ 198 BTRFS_BALANCE_METADATA) 199 200 #define BTRFS_BALANCE_FORCE (1ULL << 3) 201 #define BTRFS_BALANCE_RESUME (1ULL << 4) 202 203 /* 204 * Balance filters 205 */ 206 #define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0) 207 #define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1) 208 #define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2) 209 #define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3) 210 #define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4) 211 212 /* 213 * Profile changing flags. When SOFT is set we won't relocate chunk if 214 * it already has the target profile (even though it may be 215 * half-filled). 216 */ 217 #define BTRFS_BALANCE_ARGS_CONVERT (1ULL << 8) 218 #define BTRFS_BALANCE_ARGS_SOFT (1ULL << 9) 219 220 struct btrfs_balance_args; 221 struct btrfs_balance_progress; 222 struct btrfs_balance_control { 223 struct btrfs_fs_info *fs_info; 224 225 struct btrfs_balance_args data; 226 struct btrfs_balance_args meta; 227 struct btrfs_balance_args sys; 228 229 u64 flags; 230 231 struct btrfs_balance_progress stat; 232 }; 233 234 int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start, 235 u64 end, u64 *length); 236 237 #define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \ 238 (sizeof(struct btrfs_bio_stripe) * (n))) 239 240 int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, 241 struct btrfs_device *device, 242 u64 chunk_tree, u64 chunk_objectid, 243 u64 chunk_offset, u64 start, u64 num_bytes); 244 int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, 245 u64 logical, u64 *length, 246 struct btrfs_bio **bbio_ret, int mirror_num); 247 int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, 248 u64 chunk_start, u64 physical, u64 devid, 249 u64 **logical, int *naddrs, int *stripe_len); 250 int btrfs_read_sys_array(struct btrfs_root *root); 251 int btrfs_read_chunk_tree(struct btrfs_root *root); 252 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, 253 struct btrfs_root *extent_root, u64 type); 254 void btrfs_mapping_init(struct btrfs_mapping_tree *tree); 255 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree); 256 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, 257 int mirror_num, int async_submit); 258 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, 259 fmode_t flags, void *holder); 260 int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, 261 struct btrfs_fs_devices **fs_devices_ret); 262 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); 263 void btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices); 264 int btrfs_add_device(struct btrfs_trans_handle *trans, 265 struct btrfs_root *root, 266 struct btrfs_device *device); 267 int btrfs_rm_device(struct btrfs_root *root, char *device_path); 268 void btrfs_cleanup_fs_uuids(void); 269 int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len); 270 int btrfs_grow_device(struct btrfs_trans_handle *trans, 271 struct btrfs_device *device, u64 new_size); 272 struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, 273 u8 *uuid, u8 *fsid); 274 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); 275 int btrfs_init_new_device(struct btrfs_root *root, char *path); 276 int btrfs_balance(struct btrfs_balance_control *bctl, 277 struct btrfs_ioctl_balance_args *bargs); 278 int btrfs_recover_balance(struct btrfs_root *tree_root); 279 int btrfs_pause_balance(struct btrfs_fs_info *fs_info); 280 int btrfs_cancel_balance(struct btrfs_fs_info *fs_info); 281 int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset); 282 int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes, 283 u64 *start, u64 *max_avail); 284 #endif 285