2 * Copyright (C) 2007 Oracle. All rights reserved.
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.
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.
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.
19 #ifndef __BTRFS_VOLUMES_
20 #define __BTRFS_VOLUMES_
22 #include <linux/bio.h>
23 #include <linux/sort.h>
24 #include "async-thread.h"
26 #define BTRFS_STRIPE_LEN (64 * 1024)
29 struct btrfs_pending_bios {
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;
40 /* regular prio bios */
41 struct btrfs_pending_bios pending_bios;
43 struct btrfs_pending_bios pending_sync_bios;
54 struct block_device *bdev;
56 /* the mode sent to blkdev_get */
61 /* the internal btrfs device id */
64 /* size of the device */
67 /* size of the disk */
73 /* optimal io alignment for this device */
76 /* optimal io width for this device */
79 /* minimal io size for this device */
82 /* type and info about this device */
85 /* physical drive uuid (or lvm uuid) */
86 u8 uuid[BTRFS_UUID_SIZE];
88 struct btrfs_work work;
91 struct btrfs_fs_devices {
92 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
94 /* the device with this id has the most recent copy of the super */
102 struct block_device *latest_bdev;
104 /* all of the devices in the FS, protected by a mutex
105 * so we can safely walk it to write out the supers without
106 * worrying about add/remove by the multi-device code
108 struct mutex device_list_mutex;
109 struct list_head devices;
111 /* devices not currently being allocated */
112 struct list_head alloc_list;
113 struct list_head list;
115 struct btrfs_fs_devices *seed;
120 /* set when we find or add a device that doesn't have the
126 struct btrfs_bio_stripe {
127 struct btrfs_device *dev;
129 u64 length; /* only used for discard mappings */
132 struct btrfs_multi_bio {
133 atomic_t stripes_pending;
134 bio_end_io_t *end_io;
135 struct bio *orig_bio;
140 struct btrfs_bio_stripe stripes[];
143 struct btrfs_device_info {
144 struct btrfs_device *dev;
157 struct btrfs_bio_stripe stripes[];
160 int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
161 u64 end, u64 *length);
163 #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
164 (sizeof(struct btrfs_bio_stripe) * (n)))
166 int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
167 struct btrfs_device *device,
168 u64 chunk_tree, u64 chunk_objectid,
169 u64 chunk_offset, u64 start, u64 num_bytes);
170 int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
171 u64 logical, u64 *length,
172 struct btrfs_multi_bio **multi_ret, int mirror_num);
173 int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
174 u64 chunk_start, u64 physical, u64 devid,
175 u64 **logical, int *naddrs, int *stripe_len);
176 int btrfs_read_sys_array(struct btrfs_root *root);
177 int btrfs_read_chunk_tree(struct btrfs_root *root);
178 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
179 struct btrfs_root *extent_root, u64 type);
180 void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
181 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
182 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
183 int mirror_num, int async_submit);
184 int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
185 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
186 fmode_t flags, void *holder);
187 int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
188 struct btrfs_fs_devices **fs_devices_ret);
189 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
190 int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices);
191 int btrfs_add_device(struct btrfs_trans_handle *trans,
192 struct btrfs_root *root,
193 struct btrfs_device *device);
194 int btrfs_rm_device(struct btrfs_root *root, char *device_path);
195 int btrfs_cleanup_fs_uuids(void);
196 int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
197 int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree,
198 u64 logical, struct page *page);
199 int btrfs_grow_device(struct btrfs_trans_handle *trans,
200 struct btrfs_device *device, u64 new_size);
201 struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
203 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
204 int btrfs_init_new_device(struct btrfs_root *root, char *path);
205 int btrfs_balance(struct btrfs_root *dev_root);
206 void btrfs_unlock_volumes(void);
207 void btrfs_lock_volumes(void);
208 int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
209 int find_free_dev_extent(struct btrfs_trans_handle *trans,
210 struct btrfs_device *device, u64 num_bytes,
211 u64 *start, u64 *max_avail);