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 25struct buffer_head; 26struct btrfs_pending_bios { 27 struct bio *head; 28 struct bio *tail; 29}; 30 31struct 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 88struct 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; 99 100 /* all of the devices in the FS, protected by a mutex 101 * so we can safely walk it to write out the supers without 102 * worrying about add/remove by the multi-device code 103 */ 104 struct mutex device_list_mutex; 105 struct list_head devices; 106 107 /* devices not currently being allocated */ 108 struct list_head alloc_list; 109 struct list_head list; 110 111 struct btrfs_fs_devices *seed; 112 int seeding; 113 114 int opened; 115 116 /* set when we find or add a device that doesn't have the 117 * nonrot flag set 118 */ 119 int rotating; 120}; 121 122struct btrfs_bio_stripe { 123 struct btrfs_device *dev; 124 u64 physical; 125}; 126 127struct btrfs_multi_bio { 128 atomic_t stripes_pending; 129 bio_end_io_t *end_io; 130 struct bio *orig_bio; 131 void *private; 132 atomic_t error; 133 int max_errors; 134 int num_stripes; 135 struct btrfs_bio_stripe stripes[]; 136}; 137 138#define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \ 139 (sizeof(struct btrfs_bio_stripe) * (n))) 140 141int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, 142 struct btrfs_device *device, 143 u64 chunk_tree, u64 chunk_objectid, 144 u64 chunk_offset, u64 start, u64 num_bytes); 145int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, 146 u64 logical, u64 *length, 147 struct btrfs_multi_bio **multi_ret, int mirror_num); 148int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, 149 u64 chunk_start, u64 physical, u64 devid, 150 u64 **logical, int *naddrs, int *stripe_len); 151int btrfs_read_sys_array(struct btrfs_root *root); 152int btrfs_read_chunk_tree(struct btrfs_root *root); 153int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, 154 struct btrfs_root *extent_root, u64 type); 155void btrfs_mapping_init(struct btrfs_mapping_tree *tree); 156void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree); 157int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, 158 int mirror_num, int async_submit); 159int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf); 160int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, 161 fmode_t flags, void *holder); 162int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, 163 struct btrfs_fs_devices **fs_devices_ret); 164int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); 165int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices); 166int btrfs_add_device(struct btrfs_trans_handle *trans, 167 struct btrfs_root *root, 168 struct btrfs_device *device); 169int btrfs_rm_device(struct btrfs_root *root, char *device_path); 170int btrfs_cleanup_fs_uuids(void); 171int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len); 172int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree, 173 u64 logical, struct page *page); 174int btrfs_grow_device(struct btrfs_trans_handle *trans, 175 struct btrfs_device *device, u64 new_size); 176struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, 177 u8 *uuid, u8 *fsid); 178int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); 179int btrfs_init_new_device(struct btrfs_root *root, char *path); 180int btrfs_balance(struct btrfs_root *dev_root); 181void btrfs_unlock_volumes(void); 182void btrfs_lock_volumes(void); 183int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset); 184int find_free_dev_extent(struct btrfs_trans_handle *trans, 185 struct btrfs_device *device, u64 num_bytes, 186 u64 *start, u64 *max_avail); 187#endif 188