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 97 struct btrfs_fs_devices { 98 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 99 100 /* the device with this id has the most recent copy of the super */ 101 u64 latest_devid; 102 u64 latest_trans; 103 u64 num_devices; 104 u64 open_devices; 105 u64 rw_devices; 106 u64 missing_devices; 107 u64 total_rw_bytes; 108 u64 num_can_discard; 109 struct block_device *latest_bdev; 110 111 /* all of the devices in the FS, protected by a mutex 112 * so we can safely walk it to write out the supers without 113 * worrying about add/remove by the multi-device code 114 */ 115 struct mutex device_list_mutex; 116 struct list_head devices; 117 118 /* devices not currently being allocated */ 119 struct list_head alloc_list; 120 struct list_head list; 121 122 struct btrfs_fs_devices *seed; 123 int seeding; 124 125 int opened; 126 127 /* set when we find or add a device that doesn't have the 128 * nonrot flag set 129 */ 130 int rotating; 131 }; 132 133 struct btrfs_bio_stripe { 134 struct btrfs_device *dev; 135 u64 physical; 136 u64 length; /* only used for discard mappings */ 137 }; 138 139 struct btrfs_multi_bio { 140 atomic_t stripes_pending; 141 bio_end_io_t *end_io; 142 struct bio *orig_bio; 143 void *private; 144 atomic_t error; 145 int max_errors; 146 int num_stripes; 147 struct btrfs_bio_stripe stripes[]; 148 }; 149 150 struct btrfs_device_info { 151 struct btrfs_device *dev; 152 u64 dev_offset; 153 u64 max_avail; 154 u64 total_avail; 155 }; 156 157 struct map_lookup { 158 u64 type; 159 int io_align; 160 int io_width; 161 int stripe_len; 162 int sector_size; 163 int num_stripes; 164 int sub_stripes; 165 struct btrfs_bio_stripe stripes[]; 166 }; 167 168 #define map_lookup_size(n) (sizeof(struct map_lookup) + \ 169 (sizeof(struct btrfs_bio_stripe) * (n))) 170 171 int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start, 172 u64 end, u64 *length); 173 174 #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \ 175 (sizeof(struct btrfs_bio_stripe) * (n))) 176 177 int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, 178 struct btrfs_device *device, 179 u64 chunk_tree, u64 chunk_objectid, 180 u64 chunk_offset, u64 start, u64 num_bytes); 181 int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, 182 u64 logical, u64 *length, 183 struct btrfs_multi_bio **multi_ret, int mirror_num); 184 int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, 185 u64 chunk_start, u64 physical, u64 devid, 186 u64 **logical, int *naddrs, int *stripe_len); 187 int btrfs_read_sys_array(struct btrfs_root *root); 188 int btrfs_read_chunk_tree(struct btrfs_root *root); 189 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, 190 struct btrfs_root *extent_root, u64 type); 191 void btrfs_mapping_init(struct btrfs_mapping_tree *tree); 192 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree); 193 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, 194 int mirror_num, int async_submit); 195 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, 196 fmode_t flags, void *holder); 197 int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, 198 struct btrfs_fs_devices **fs_devices_ret); 199 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); 200 int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices); 201 int btrfs_add_device(struct btrfs_trans_handle *trans, 202 struct btrfs_root *root, 203 struct btrfs_device *device); 204 int btrfs_rm_device(struct btrfs_root *root, char *device_path); 205 int btrfs_cleanup_fs_uuids(void); 206 int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len); 207 int btrfs_grow_device(struct btrfs_trans_handle *trans, 208 struct btrfs_device *device, u64 new_size); 209 struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, 210 u8 *uuid, u8 *fsid); 211 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); 212 int btrfs_init_new_device(struct btrfs_root *root, char *path); 213 int btrfs_balance(struct btrfs_root *dev_root); 214 int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset); 215 int find_free_dev_extent(struct btrfs_trans_handle *trans, 216 struct btrfs_device *device, u64 num_bytes, 217 u64 *start, u64 *max_avail); 218 #endif 219