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 52 spinlock_t io_lock; 53 54 struct block_device *bdev; 55 56 /* the mode sent to blkdev_get */ 57 fmode_t mode; 58 59 char *name; 60 61 /* the internal btrfs device id */ 62 u64 devid; 63 64 /* size of the device */ 65 u64 total_bytes; 66 67 /* size of the disk */ 68 u64 disk_total_bytes; 69 70 /* bytes used */ 71 u64 bytes_used; 72 73 /* optimal io alignment for this device */ 74 u32 io_align; 75 76 /* optimal io width for this device */ 77 u32 io_width; 78 79 /* minimal io size for this device */ 80 u32 sector_size; 81 82 /* type and info about this device */ 83 u64 type; 84 85 /* physical drive uuid (or lvm uuid) */ 86 u8 uuid[BTRFS_UUID_SIZE]; 87 88 /* per-device scrub information */ 89 struct scrub_dev *scrub_device; 90 91 struct btrfs_work work; 92 struct rcu_head rcu; 93 struct work_struct rcu_work; 94 }; 95 96 struct btrfs_fs_devices { 97 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 98 99 /* the device with this id has the most recent copy of the super */ 100 u64 latest_devid; 101 u64 latest_trans; 102 u64 num_devices; 103 u64 open_devices; 104 u64 rw_devices; 105 u64 missing_devices; 106 u64 total_rw_bytes; 107 struct block_device *latest_bdev; 108 109 /* all of the devices in the FS, protected by a mutex 110 * so we can safely walk it to write out the supers without 111 * worrying about add/remove by the multi-device code 112 */ 113 struct mutex device_list_mutex; 114 struct list_head devices; 115 116 /* devices not currently being allocated */ 117 struct list_head alloc_list; 118 struct list_head list; 119 120 struct btrfs_fs_devices *seed; 121 int seeding; 122 123 int opened; 124 125 /* set when we find or add a device that doesn't have the 126 * nonrot flag set 127 */ 128 int rotating; 129 }; 130 131 struct btrfs_bio_stripe { 132 struct btrfs_device *dev; 133 u64 physical; 134 u64 length; /* only used for discard mappings */ 135 }; 136 137 struct btrfs_multi_bio { 138 atomic_t stripes_pending; 139 bio_end_io_t *end_io; 140 struct bio *orig_bio; 141 void *private; 142 atomic_t error; 143 int max_errors; 144 int num_stripes; 145 struct btrfs_bio_stripe stripes[]; 146 }; 147 148 struct btrfs_device_info { 149 struct btrfs_device *dev; 150 u64 dev_offset; 151 u64 max_avail; 152 u64 total_avail; 153 }; 154 155 struct map_lookup { 156 u64 type; 157 int io_align; 158 int io_width; 159 int stripe_len; 160 int sector_size; 161 int num_stripes; 162 int sub_stripes; 163 struct btrfs_bio_stripe stripes[]; 164 }; 165 166 #define map_lookup_size(n) (sizeof(struct map_lookup) + \ 167 (sizeof(struct btrfs_bio_stripe) * (n))) 168 169 int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start, 170 u64 end, u64 *length); 171 172 #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \ 173 (sizeof(struct btrfs_bio_stripe) * (n))) 174 175 int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, 176 struct btrfs_device *device, 177 u64 chunk_tree, u64 chunk_objectid, 178 u64 chunk_offset, u64 start, u64 num_bytes); 179 int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, 180 u64 logical, u64 *length, 181 struct btrfs_multi_bio **multi_ret, int mirror_num); 182 int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, 183 u64 chunk_start, u64 physical, u64 devid, 184 u64 **logical, int *naddrs, int *stripe_len); 185 int btrfs_read_sys_array(struct btrfs_root *root); 186 int btrfs_read_chunk_tree(struct btrfs_root *root); 187 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, 188 struct btrfs_root *extent_root, u64 type); 189 void btrfs_mapping_init(struct btrfs_mapping_tree *tree); 190 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree); 191 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, 192 int mirror_num, int async_submit); 193 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, 194 fmode_t flags, void *holder); 195 int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, 196 struct btrfs_fs_devices **fs_devices_ret); 197 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); 198 int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices); 199 int btrfs_add_device(struct btrfs_trans_handle *trans, 200 struct btrfs_root *root, 201 struct btrfs_device *device); 202 int btrfs_rm_device(struct btrfs_root *root, char *device_path); 203 int btrfs_cleanup_fs_uuids(void); 204 int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len); 205 int btrfs_grow_device(struct btrfs_trans_handle *trans, 206 struct btrfs_device *device, u64 new_size); 207 struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, 208 u8 *uuid, u8 *fsid); 209 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); 210 int btrfs_init_new_device(struct btrfs_root *root, char *path); 211 int btrfs_balance(struct btrfs_root *dev_root); 212 int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset); 213 int find_free_dev_extent(struct btrfs_trans_handle *trans, 214 struct btrfs_device *device, u64 num_bytes, 215 u64 *start, u64 *max_avail); 216 #endif 217