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 "async-thread.h" 24 25 struct buffer_head; 26 struct btrfs_pending_bios { 27 struct bio *head; 28 struct bio *tail; 29 }; 30 31 struct btrfs_device { 32 struct list_head dev_list; 33 struct list_head dev_alloc_list; 34 struct btrfs_fs_devices *fs_devices; 35 struct btrfs_root *dev_root; 36 37 /* regular prio bios */ 38 struct btrfs_pending_bios pending_bios; 39 /* WRITE_SYNC bios */ 40 struct btrfs_pending_bios pending_sync_bios; 41 42 int running_pending; 43 u64 generation; 44 45 int barriers; 46 int writeable; 47 int in_fs_metadata; 48 49 spinlock_t io_lock; 50 51 struct block_device *bdev; 52 53 /* the mode sent to open_bdev_exclusive */ 54 fmode_t mode; 55 56 char *name; 57 58 /* the internal btrfs device id */ 59 u64 devid; 60 61 /* size of the device */ 62 u64 total_bytes; 63 64 /* size of the disk */ 65 u64 disk_total_bytes; 66 67 /* bytes used */ 68 u64 bytes_used; 69 70 /* optimal io alignment for this device */ 71 u32 io_align; 72 73 /* optimal io width for this device */ 74 u32 io_width; 75 76 /* minimal io size for this device */ 77 u32 sector_size; 78 79 /* type and info about this device */ 80 u64 type; 81 82 /* physical drive uuid (or lvm uuid) */ 83 u8 uuid[BTRFS_UUID_SIZE]; 84 85 struct btrfs_work work; 86 }; 87 88 struct btrfs_fs_devices { 89 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 90 91 /* the device with this id has the most recent copy of the super */ 92 u64 latest_devid; 93 u64 latest_trans; 94 u64 num_devices; 95 u64 open_devices; 96 u64 rw_devices; 97 u64 total_rw_bytes; 98 struct block_device *latest_bdev; 99 /* all of the devices in the FS */ 100 struct list_head devices; 101 102 /* devices not currently being allocated */ 103 struct list_head alloc_list; 104 struct list_head list; 105 106 struct btrfs_fs_devices *seed; 107 int seeding; 108 109 int opened; 110 }; 111 112 struct btrfs_bio_stripe { 113 struct btrfs_device *dev; 114 u64 physical; 115 }; 116 117 struct btrfs_multi_bio { 118 atomic_t stripes_pending; 119 bio_end_io_t *end_io; 120 struct bio *orig_bio; 121 void *private; 122 atomic_t error; 123 int max_errors; 124 int num_stripes; 125 struct btrfs_bio_stripe stripes[]; 126 }; 127 128 #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \ 129 (sizeof(struct btrfs_bio_stripe) * (n))) 130 131 int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, 132 struct btrfs_device *device, 133 u64 chunk_tree, u64 chunk_objectid, 134 u64 chunk_offset, u64 start, u64 num_bytes); 135 int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, 136 u64 logical, u64 *length, 137 struct btrfs_multi_bio **multi_ret, int mirror_num); 138 int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, 139 u64 chunk_start, u64 physical, u64 devid, 140 u64 **logical, int *naddrs, int *stripe_len); 141 int btrfs_read_sys_array(struct btrfs_root *root); 142 int btrfs_read_chunk_tree(struct btrfs_root *root); 143 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, 144 struct btrfs_root *extent_root, u64 type); 145 void btrfs_mapping_init(struct btrfs_mapping_tree *tree); 146 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree); 147 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, 148 int mirror_num, int async_submit); 149 int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf); 150 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, 151 fmode_t flags, void *holder); 152 int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, 153 struct btrfs_fs_devices **fs_devices_ret); 154 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); 155 int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices); 156 int btrfs_add_device(struct btrfs_trans_handle *trans, 157 struct btrfs_root *root, 158 struct btrfs_device *device); 159 int btrfs_rm_device(struct btrfs_root *root, char *device_path); 160 int btrfs_cleanup_fs_uuids(void); 161 int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len); 162 int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree, 163 u64 logical, struct page *page); 164 int btrfs_grow_device(struct btrfs_trans_handle *trans, 165 struct btrfs_device *device, u64 new_size); 166 struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, 167 u8 *uuid, u8 *fsid); 168 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); 169 int btrfs_init_new_device(struct btrfs_root *root, char *path); 170 int btrfs_balance(struct btrfs_root *dev_root); 171 void btrfs_unlock_volumes(void); 172 void btrfs_lock_volumes(void); 173 int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset); 174 #endif 175