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;
55 struct block_device *bdev;
57 /* the mode sent to blkdev_get */
62 /* the internal btrfs device id */
65 /* size of the device */
68 /* size of the disk */
74 /* optimal io alignment for this device */
77 /* optimal io width for this device */
80 /* minimal io size for this device */
83 /* type and info about this device */
86 /* physical drive uuid (or lvm uuid) */
87 u8 uuid[BTRFS_UUID_SIZE];
89 /* per-device scrub information */
90 struct scrub_dev *scrub_device;
92 struct btrfs_work work;
94 struct work_struct rcu_work;
97 spinlock_t reada_lock;
98 atomic_t reada_in_flight;
100 struct reada_zone *reada_curr_zone;
101 struct radix_tree_root reada_zones;
102 struct radix_tree_root reada_extents;
104 /* for sending down flush barriers */
105 struct bio *flush_bio;
106 struct completion flush_wait;
111 struct btrfs_fs_devices {
112 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
114 /* the device with this id has the most recent copy of the super */
123 struct block_device *latest_bdev;
125 /* all of the devices in the FS, protected by a mutex
126 * so we can safely walk it to write out the supers without
127 * worrying about add/remove by the multi-device code
129 struct mutex device_list_mutex;
130 struct list_head devices;
132 /* devices not currently being allocated */
133 struct list_head alloc_list;
134 struct list_head list;
136 struct btrfs_fs_devices *seed;
141 /* set when we find or add a device that doesn't have the
147 struct btrfs_bio_stripe {
148 struct btrfs_device *dev;
150 u64 length; /* only used for discard mappings */
154 typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
157 atomic_t stripes_pending;
158 bio_end_io_t *end_io;
159 struct bio *orig_bio;
165 struct btrfs_bio_stripe stripes[];
168 struct btrfs_device_info {
169 struct btrfs_device *dev;
183 struct btrfs_bio_stripe stripes[];
186 #define map_lookup_size(n) (sizeof(struct map_lookup) + \
187 (sizeof(struct btrfs_bio_stripe) * (n)))
189 int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
190 u64 end, u64 *length);
192 #define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \
193 (sizeof(struct btrfs_bio_stripe) * (n)))
195 int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
196 struct btrfs_device *device,
197 u64 chunk_tree, u64 chunk_objectid,
198 u64 chunk_offset, u64 start, u64 num_bytes);
199 int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
200 u64 logical, u64 *length,
201 struct btrfs_bio **bbio_ret, int mirror_num);
202 int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
203 u64 chunk_start, u64 physical, u64 devid,
204 u64 **logical, int *naddrs, int *stripe_len);
205 int btrfs_read_sys_array(struct btrfs_root *root);
206 int btrfs_read_chunk_tree(struct btrfs_root *root);
207 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
208 struct btrfs_root *extent_root, u64 type);
209 void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
210 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
211 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
212 int mirror_num, int async_submit);
213 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
214 fmode_t flags, void *holder);
215 int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
216 struct btrfs_fs_devices **fs_devices_ret);
217 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
218 int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices);
219 int btrfs_add_device(struct btrfs_trans_handle *trans,
220 struct btrfs_root *root,
221 struct btrfs_device *device);
222 int btrfs_rm_device(struct btrfs_root *root, char *device_path);
223 int btrfs_cleanup_fs_uuids(void);
224 int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
225 int btrfs_grow_device(struct btrfs_trans_handle *trans,
226 struct btrfs_device *device, u64 new_size);
227 struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
229 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
230 int btrfs_init_new_device(struct btrfs_root *root, char *path);
231 int btrfs_balance(struct btrfs_root *dev_root);
232 int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
233 int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes,
234 u64 *start, u64 *max_avail);