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 }; 104 105 struct btrfs_fs_devices { 106 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 107 108 /* the device with this id has the most recent copy of the super */ 109 u64 latest_devid; 110 u64 latest_trans; 111 u64 num_devices; 112 u64 open_devices; 113 u64 rw_devices; 114 u64 missing_devices; 115 u64 total_rw_bytes; 116 u64 num_can_discard; 117 struct block_device *latest_bdev; 118 119 /* all of the devices in the FS, protected by a mutex 120 * so we can safely walk it to write out the supers without 121 * worrying about add/remove by the multi-device code 122 */ 123 struct mutex device_list_mutex; 124 struct list_head devices; 125 126 /* devices not currently being allocated */ 127 struct list_head alloc_list; 128 struct list_head list; 129 130 struct btrfs_fs_devices *seed; 131 int seeding; 132 133 int opened; 134 135 /* set when we find or add a device that doesn't have the 136 * nonrot flag set 137 */ 138 int rotating; 139 }; 140 141 struct btrfs_bio_stripe { 142 struct btrfs_device *dev; 143 u64 physical; 144 u64 length; /* only used for discard mappings */ 145 }; 146 147 struct btrfs_bio; 148 typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err); 149 150 struct btrfs_bio { 151 atomic_t stripes_pending; 152 bio_end_io_t *end_io; 153 struct bio *orig_bio; 154 void *private; 155 atomic_t error; 156 int max_errors; 157 int num_stripes; 158 int mirror_num; 159 struct btrfs_bio_stripe stripes[]; 160 }; 161 162 struct btrfs_device_info { 163 struct btrfs_device *dev; 164 u64 dev_offset; 165 u64 max_avail; 166 u64 total_avail; 167 }; 168 169 struct map_lookup { 170 u64 type; 171 int io_align; 172 int io_width; 173 int stripe_len; 174 int sector_size; 175 int num_stripes; 176 int sub_stripes; 177 struct btrfs_bio_stripe stripes[]; 178 }; 179 180 #define map_lookup_size(n) (sizeof(struct map_lookup) + \ 181 (sizeof(struct btrfs_bio_stripe) * (n))) 182 183 int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start, 184 u64 end, u64 *length); 185 186 #define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \ 187 (sizeof(struct btrfs_bio_stripe) * (n))) 188 189 int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, 190 struct btrfs_device *device, 191 u64 chunk_tree, u64 chunk_objectid, 192 u64 chunk_offset, u64 start, u64 num_bytes); 193 int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, 194 u64 logical, u64 *length, 195 struct btrfs_bio **bbio_ret, int mirror_num); 196 int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, 197 u64 chunk_start, u64 physical, u64 devid, 198 u64 **logical, int *naddrs, int *stripe_len); 199 int btrfs_read_sys_array(struct btrfs_root *root); 200 int btrfs_read_chunk_tree(struct btrfs_root *root); 201 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, 202 struct btrfs_root *extent_root, u64 type); 203 void btrfs_mapping_init(struct btrfs_mapping_tree *tree); 204 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree); 205 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, 206 int mirror_num, int async_submit); 207 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, 208 fmode_t flags, void *holder); 209 int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, 210 struct btrfs_fs_devices **fs_devices_ret); 211 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); 212 int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices); 213 int btrfs_add_device(struct btrfs_trans_handle *trans, 214 struct btrfs_root *root, 215 struct btrfs_device *device); 216 int btrfs_rm_device(struct btrfs_root *root, char *device_path); 217 int btrfs_cleanup_fs_uuids(void); 218 int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len); 219 int btrfs_grow_device(struct btrfs_trans_handle *trans, 220 struct btrfs_device *device, u64 new_size); 221 struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, 222 u8 *uuid, u8 *fsid); 223 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); 224 int btrfs_init_new_device(struct btrfs_root *root, char *path); 225 int btrfs_balance(struct btrfs_root *dev_root); 226 int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset); 227 int find_free_dev_extent(struct btrfs_trans_handle *trans, 228 struct btrfs_device *device, u64 num_bytes, 229 u64 *start, u64 *max_avail); 230 #endif 231