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"
27 #define BTRFS_STRIPE_LEN (64 * 1024)
30 struct btrfs_pending_bios {
36 struct list_head dev_list;
37 struct list_head dev_alloc_list;
38 struct btrfs_fs_devices *fs_devices;
39 struct btrfs_root *dev_root;
41 /* regular prio bios */
42 struct btrfs_pending_bios pending_bios;
44 struct btrfs_pending_bios pending_sync_bios;
56 struct block_device *bdev;
58 /* the mode sent to blkdev_get */
61 struct rcu_string *name;
63 /* the internal btrfs device id */
66 /* size of the device */
69 /* size of the disk */
75 /* optimal io alignment for this device */
78 /* optimal io width for this device */
81 /* minimal io size for this device */
84 /* type and info about this device */
87 /* physical drive uuid (or lvm uuid) */
88 u8 uuid[BTRFS_UUID_SIZE];
90 /* per-device scrub information */
91 struct scrub_dev *scrub_device;
93 struct btrfs_work work;
95 struct work_struct rcu_work;
98 spinlock_t reada_lock;
99 atomic_t reada_in_flight;
101 struct reada_zone *reada_curr_zone;
102 struct radix_tree_root reada_zones;
103 struct radix_tree_root reada_extents;
105 /* for sending down flush barriers */
106 struct bio *flush_bio;
107 struct completion flush_wait;
110 /* disk I/O failure stats. For detailed description refer to
111 * enum btrfs_dev_stat_values in ioctl.h */
113 int dev_stats_dirty; /* counters need to be written to disk */
114 atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
117 struct btrfs_fs_devices {
118 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
120 /* the device with this id has the most recent copy of the super */
129 struct block_device *latest_bdev;
131 /* all of the devices in the FS, protected by a mutex
132 * so we can safely walk it to write out the supers without
133 * worrying about add/remove by the multi-device code
135 struct mutex device_list_mutex;
136 struct list_head devices;
138 /* devices not currently being allocated */
139 struct list_head alloc_list;
140 struct list_head list;
142 struct btrfs_fs_devices *seed;
147 /* set when we find or add a device that doesn't have the
153 struct btrfs_bio_stripe {
154 struct btrfs_device *dev;
156 u64 length; /* only used for discard mappings */
160 typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
163 atomic_t stripes_pending;
164 bio_end_io_t *end_io;
165 struct bio *orig_bio;
171 struct btrfs_bio_stripe stripes[];
174 struct btrfs_device_info {
175 struct btrfs_device *dev;
189 struct btrfs_bio_stripe stripes[];
192 #define map_lookup_size(n) (sizeof(struct map_lookup) + \
193 (sizeof(struct btrfs_bio_stripe) * (n)))
196 * Restriper's general type filter
198 #define BTRFS_BALANCE_DATA (1ULL << 0)
199 #define BTRFS_BALANCE_SYSTEM (1ULL << 1)
200 #define BTRFS_BALANCE_METADATA (1ULL << 2)
202 #define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA | \
203 BTRFS_BALANCE_SYSTEM | \
204 BTRFS_BALANCE_METADATA)
206 #define BTRFS_BALANCE_FORCE (1ULL << 3)
207 #define BTRFS_BALANCE_RESUME (1ULL << 4)
212 #define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0)
213 #define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1)
214 #define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2)
215 #define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3)
216 #define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4)
219 * Profile changing flags. When SOFT is set we won't relocate chunk if
220 * it already has the target profile (even though it may be
223 #define BTRFS_BALANCE_ARGS_CONVERT (1ULL << 8)
224 #define BTRFS_BALANCE_ARGS_SOFT (1ULL << 9)
226 struct btrfs_balance_args;
227 struct btrfs_balance_progress;
228 struct btrfs_balance_control {
229 struct btrfs_fs_info *fs_info;
231 struct btrfs_balance_args data;
232 struct btrfs_balance_args meta;
233 struct btrfs_balance_args sys;
237 struct btrfs_balance_progress stat;
240 int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
241 u64 end, u64 *length);
243 #define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \
244 (sizeof(struct btrfs_bio_stripe) * (n)))
246 int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
247 struct btrfs_device *device,
248 u64 chunk_tree, u64 chunk_objectid,
249 u64 chunk_offset, u64 start, u64 num_bytes);
250 int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
251 u64 logical, u64 *length,
252 struct btrfs_bio **bbio_ret, int mirror_num);
253 int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
254 u64 chunk_start, u64 physical, u64 devid,
255 u64 **logical, int *naddrs, int *stripe_len);
256 int btrfs_read_sys_array(struct btrfs_root *root);
257 int btrfs_read_chunk_tree(struct btrfs_root *root);
258 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
259 struct btrfs_root *extent_root, u64 type);
260 void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
261 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
262 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
263 int mirror_num, int async_submit);
264 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
265 fmode_t flags, void *holder);
266 int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
267 struct btrfs_fs_devices **fs_devices_ret);
268 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
269 void btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices);
270 int btrfs_add_device(struct btrfs_trans_handle *trans,
271 struct btrfs_root *root,
272 struct btrfs_device *device);
273 int btrfs_rm_device(struct btrfs_root *root, char *device_path);
274 void btrfs_cleanup_fs_uuids(void);
275 int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
276 int btrfs_grow_device(struct btrfs_trans_handle *trans,
277 struct btrfs_device *device, u64 new_size);
278 struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
280 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
281 int btrfs_init_new_device(struct btrfs_root *root, char *path);
282 int btrfs_balance(struct btrfs_balance_control *bctl,
283 struct btrfs_ioctl_balance_args *bargs);
284 int btrfs_recover_balance(struct btrfs_root *tree_root);
285 int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
286 int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
287 int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
288 int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes,
289 u64 *start, u64 *max_avail);
290 struct btrfs_device *btrfs_find_device_for_logical(struct btrfs_root *root,
291 u64 logical, int mirror_num);
292 void btrfs_dev_stat_print_on_error(struct btrfs_device *device);
293 void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
294 int btrfs_get_dev_stats(struct btrfs_root *root,
295 struct btrfs_ioctl_get_dev_stats *stats,
296 int reset_after_read);
297 int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
298 int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
299 struct btrfs_fs_info *fs_info);
301 static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
304 atomic_inc(dev->dev_stat_values + index);
305 dev->dev_stats_dirty = 1;
308 static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
311 return atomic_read(dev->dev_stat_values + index);
314 static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
319 ret = atomic_xchg(dev->dev_stat_values + index, 0);
320 dev->dev_stats_dirty = 1;
324 static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
325 int index, unsigned long val)
327 atomic_set(dev->dev_stat_values + index, val);
328 dev->dev_stats_dirty = 1;
331 static inline void btrfs_dev_stat_reset(struct btrfs_device *dev,
334 btrfs_dev_stat_set(dev, index, 0);