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)))
190 * Restriper's general type filter
192 #define BTRFS_BALANCE_DATA (1ULL << 0)
193 #define BTRFS_BALANCE_SYSTEM (1ULL << 1)
194 #define BTRFS_BALANCE_METADATA (1ULL << 2)
196 #define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA | \
197 BTRFS_BALANCE_SYSTEM | \
198 BTRFS_BALANCE_METADATA)
200 #define BTRFS_BALANCE_FORCE (1ULL << 3)
201 #define BTRFS_BALANCE_RESUME (1ULL << 4)
206 #define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0)
207 #define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1)
208 #define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2)
209 #define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3)
210 #define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4)
213 * Profile changing flags. When SOFT is set we won't relocate chunk if
214 * it already has the target profile (even though it may be
217 #define BTRFS_BALANCE_ARGS_CONVERT (1ULL << 8)
218 #define BTRFS_BALANCE_ARGS_SOFT (1ULL << 9)
220 struct btrfs_balance_args;
221 struct btrfs_balance_control {
222 struct btrfs_fs_info *fs_info;
224 struct btrfs_balance_args data;
225 struct btrfs_balance_args meta;
226 struct btrfs_balance_args sys;
231 int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
232 u64 end, u64 *length);
234 #define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \
235 (sizeof(struct btrfs_bio_stripe) * (n)))
237 int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
238 struct btrfs_device *device,
239 u64 chunk_tree, u64 chunk_objectid,
240 u64 chunk_offset, u64 start, u64 num_bytes);
241 int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
242 u64 logical, u64 *length,
243 struct btrfs_bio **bbio_ret, int mirror_num);
244 int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
245 u64 chunk_start, u64 physical, u64 devid,
246 u64 **logical, int *naddrs, int *stripe_len);
247 int btrfs_read_sys_array(struct btrfs_root *root);
248 int btrfs_read_chunk_tree(struct btrfs_root *root);
249 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
250 struct btrfs_root *extent_root, u64 type);
251 void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
252 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
253 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
254 int mirror_num, int async_submit);
255 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
256 fmode_t flags, void *holder);
257 int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
258 struct btrfs_fs_devices **fs_devices_ret);
259 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
260 int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices);
261 int btrfs_add_device(struct btrfs_trans_handle *trans,
262 struct btrfs_root *root,
263 struct btrfs_device *device);
264 int btrfs_rm_device(struct btrfs_root *root, char *device_path);
265 int btrfs_cleanup_fs_uuids(void);
266 int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
267 int btrfs_grow_device(struct btrfs_trans_handle *trans,
268 struct btrfs_device *device, u64 new_size);
269 struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
271 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
272 int btrfs_init_new_device(struct btrfs_root *root, char *path);
273 int btrfs_balance(struct btrfs_balance_control *bctl,
274 struct btrfs_ioctl_balance_args *bargs);
275 int btrfs_recover_balance(struct btrfs_root *tree_root);
276 int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
277 int find_free_dev_extent(struct btrfs_trans_handle *trans,
278 struct btrfs_device *device, u64 num_bytes,
279 u64 *start, u64 *max_avail);