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