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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 <linux/sort.h>
24#include "async-thread.h"
25#include "ioctl.h"
26
27#define BTRFS_STRIPE_LEN (64 * 1024)
28
29struct buffer_head;
30struct btrfs_pending_bios {
31 struct bio *head;
32 struct bio *tail;
33};
34
35struct btrfs_device {
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;
40
41 /* regular prio bios */
42 struct btrfs_pending_bios pending_bios;
43 /* WRITE_SYNC bios */
44 struct btrfs_pending_bios pending_sync_bios;
45
46 int running_pending;
47 u64 generation;
48
49 int writeable;
50 int in_fs_metadata;
51 int missing;
52 int can_discard;
53
54 spinlock_t io_lock;
55
56 struct block_device *bdev;
57
58 /* the mode sent to blkdev_get */
59 fmode_t mode;
60
61 struct rcu_string *name;
62
63 /* the internal btrfs device id */
64 u64 devid;
65
66 /* size of the device */
67 u64 total_bytes;
68
69 /* size of the disk */
70 u64 disk_total_bytes;
71
72 /* bytes used */
73 u64 bytes_used;
74
75 /* optimal io alignment for this device */
76 u32 io_align;
77
78 /* optimal io width for this device */
79 u32 io_width;
80
81 /* minimal io size for this device */
82 u32 sector_size;
83
84 /* type and info about this device */
85 u64 type;
86
87 /* physical drive uuid (or lvm uuid) */
88 u8 uuid[BTRFS_UUID_SIZE];
89
90 /* per-device scrub information */
91 struct scrub_dev *scrub_device;
92
93 struct btrfs_work work;
94 struct rcu_head rcu;
95 struct work_struct rcu_work;
96
97 /* readahead state */
98 spinlock_t reada_lock;
99 atomic_t reada_in_flight;
100 u64 reada_next;
101 struct reada_zone *reada_curr_zone;
102 struct radix_tree_root reada_zones;
103 struct radix_tree_root reada_extents;
104
105 /* for sending down flush barriers */
106 struct bio *flush_bio;
107 struct completion flush_wait;
108 int nobarriers;
109
110 /* disk I/O failure stats. For detailed description refer to
111 * enum btrfs_dev_stat_values in ioctl.h */
112 int dev_stats_valid;
113 int dev_stats_dirty; /* counters need to be written to disk */
114 atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
115};
116
117struct btrfs_fs_devices {
118 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
119
120 /* the device with this id has the most recent copy of the super */
121 u64 latest_devid;
122 u64 latest_trans;
123 u64 num_devices;
124 u64 open_devices;
125 u64 rw_devices;
126 u64 missing_devices;
127 u64 total_rw_bytes;
128 u64 num_can_discard;
129 struct block_device *latest_bdev;
130
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
134 */
135 struct mutex device_list_mutex;
136 struct list_head devices;
137
138 /* devices not currently being allocated */
139 struct list_head alloc_list;
140 struct list_head list;
141
142 struct btrfs_fs_devices *seed;
143 int seeding;
144
145 int opened;
146
147 /* set when we find or add a device that doesn't have the
148 * nonrot flag set
149 */
150 int rotating;
151};
152
153struct btrfs_bio_stripe {
154 struct btrfs_device *dev;
155 u64 physical;
156 u64 length; /* only used for discard mappings */
157};
158
159struct btrfs_bio;
160typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
161
162struct btrfs_bio {
163 atomic_t stripes_pending;
164 bio_end_io_t *end_io;
165 struct bio *orig_bio;
166 void *private;
167 atomic_t error;
168 int max_errors;
169 int num_stripes;
170 int mirror_num;
171 struct btrfs_bio_stripe stripes[];
172};
173
174struct btrfs_device_info {
175 struct btrfs_device *dev;
176 u64 dev_offset;
177 u64 max_avail;
178 u64 total_avail;
179};
180
181struct map_lookup {
182 u64 type;
183 int io_align;
184 int io_width;
185 int stripe_len;
186 int sector_size;
187 int num_stripes;
188 int sub_stripes;
189 struct btrfs_bio_stripe stripes[];
190};
191
192#define map_lookup_size(n) (sizeof(struct map_lookup) + \
193 (sizeof(struct btrfs_bio_stripe) * (n)))
194
195/*
196 * Restriper's general type filter
197 */
198#define BTRFS_BALANCE_DATA (1ULL << 0)
199#define BTRFS_BALANCE_SYSTEM (1ULL << 1)
200#define BTRFS_BALANCE_METADATA (1ULL << 2)
201
202#define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA | \
203 BTRFS_BALANCE_SYSTEM | \
204 BTRFS_BALANCE_METADATA)
205
206#define BTRFS_BALANCE_FORCE (1ULL << 3)
207#define BTRFS_BALANCE_RESUME (1ULL << 4)
208
209/*
210 * Balance filters
211 */
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)
217
218/*
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
221 * half-filled).
222 */
223#define BTRFS_BALANCE_ARGS_CONVERT (1ULL << 8)
224#define BTRFS_BALANCE_ARGS_SOFT (1ULL << 9)
225
226struct btrfs_balance_args;
227struct btrfs_balance_progress;
228struct btrfs_balance_control {
229 struct btrfs_fs_info *fs_info;
230
231 struct btrfs_balance_args data;
232 struct btrfs_balance_args meta;
233 struct btrfs_balance_args sys;
234
235 u64 flags;
236
237 struct btrfs_balance_progress stat;
238};
239
240int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
241 u64 end, u64 *length);
242
243#define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \
244 (sizeof(struct btrfs_bio_stripe) * (n)))
245
246int 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);
250int 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);
253int 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);
256int btrfs_read_sys_array(struct btrfs_root *root);
257int btrfs_read_chunk_tree(struct btrfs_root *root);
258int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
259 struct btrfs_root *extent_root, u64 type);
260void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
261void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
262int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
263 int mirror_num, int async_submit);
264int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
265 fmode_t flags, void *holder);
266int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
267 struct btrfs_fs_devices **fs_devices_ret);
268int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
269void btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices);
270int btrfs_add_device(struct btrfs_trans_handle *trans,
271 struct btrfs_root *root,
272 struct btrfs_device *device);
273int btrfs_rm_device(struct btrfs_root *root, char *device_path);
274void btrfs_cleanup_fs_uuids(void);
275int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
276int btrfs_grow_device(struct btrfs_trans_handle *trans,
277 struct btrfs_device *device, u64 new_size);
278struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
279 u8 *uuid, u8 *fsid);
280int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
281int btrfs_init_new_device(struct btrfs_root *root, char *path);
282int btrfs_balance(struct btrfs_balance_control *bctl,
283 struct btrfs_ioctl_balance_args *bargs);
284int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
285int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
286int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
287int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
288int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
289int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes,
290 u64 *start, u64 *max_avail);
291void btrfs_dev_stat_print_on_error(struct btrfs_device *device);
292void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
293int btrfs_get_dev_stats(struct btrfs_root *root,
294 struct btrfs_ioctl_get_dev_stats *stats,
295 int reset_after_read);
296int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
297int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
298 struct btrfs_fs_info *fs_info);
299
300static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
301 int index)
302{
303 atomic_inc(dev->dev_stat_values + index);
304 dev->dev_stats_dirty = 1;
305}
306
307static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
308 int index)
309{
310 return atomic_read(dev->dev_stat_values + index);
311}
312
313static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
314 int index)
315{
316 int ret;
317
318 ret = atomic_xchg(dev->dev_stat_values + index, 0);
319 dev->dev_stats_dirty = 1;
320 return ret;
321}
322
323static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
324 int index, unsigned long val)
325{
326 atomic_set(dev->dev_stat_values + index, val);
327 dev->dev_stats_dirty = 1;
328}
329
330static inline void btrfs_dev_stat_reset(struct btrfs_device *dev,
331 int index)
332{
333 btrfs_dev_stat_set(dev, index, 0);
334}
335#endif
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 <linux/sort.h>
24#include <linux/btrfs.h>
25#include "async-thread.h"
26
27#define BTRFS_STRIPE_LEN (64 * 1024)
28
29struct buffer_head;
30struct btrfs_pending_bios {
31 struct bio *head;
32 struct bio *tail;
33};
34
35struct btrfs_device {
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;
40
41 /* regular prio bios */
42 struct btrfs_pending_bios pending_bios;
43 /* WRITE_SYNC bios */
44 struct btrfs_pending_bios pending_sync_bios;
45
46 u64 generation;
47 int running_pending;
48 int writeable;
49 int in_fs_metadata;
50 int missing;
51 int can_discard;
52 int is_tgtdev_for_dev_replace;
53
54 spinlock_t io_lock;
55 /* the mode sent to blkdev_get */
56 fmode_t mode;
57
58 struct block_device *bdev;
59
60
61 struct rcu_string *name;
62
63 /* the internal btrfs device id */
64 u64 devid;
65
66 /* size of the device */
67 u64 total_bytes;
68
69 /* size of the disk */
70 u64 disk_total_bytes;
71
72 /* bytes used */
73 u64 bytes_used;
74
75 /* optimal io alignment for this device */
76 u32 io_align;
77
78 /* optimal io width for this device */
79 u32 io_width;
80 /* type and info about this device */
81 u64 type;
82
83 /* minimal io size for this device */
84 u32 sector_size;
85
86
87 /* physical drive uuid (or lvm uuid) */
88 u8 uuid[BTRFS_UUID_SIZE];
89
90 /* for sending down flush barriers */
91 int nobarriers;
92 struct bio *flush_bio;
93 struct completion flush_wait;
94
95 /* per-device scrub information */
96 struct scrub_ctx *scrub_device;
97
98 struct btrfs_work work;
99 struct rcu_head rcu;
100 struct work_struct rcu_work;
101
102 /* readahead state */
103 spinlock_t reada_lock;
104 atomic_t reada_in_flight;
105 u64 reada_next;
106 struct reada_zone *reada_curr_zone;
107 struct radix_tree_root reada_zones;
108 struct radix_tree_root reada_extents;
109
110
111 /* disk I/O failure stats. For detailed description refer to
112 * enum btrfs_dev_stat_values in ioctl.h */
113 int dev_stats_valid;
114 int dev_stats_dirty; /* counters need to be written to disk */
115 atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
116};
117
118struct btrfs_fs_devices {
119 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
120
121 /* the device with this id has the most recent copy of the super */
122 u64 latest_devid;
123 u64 latest_trans;
124 u64 num_devices;
125 u64 open_devices;
126 u64 rw_devices;
127 u64 missing_devices;
128 u64 total_rw_bytes;
129 u64 num_can_discard;
130 u64 total_devices;
131 struct block_device *latest_bdev;
132
133 /* all of the devices in the FS, protected by a mutex
134 * so we can safely walk it to write out the supers without
135 * worrying about add/remove by the multi-device code.
136 * Scrubbing super can kick off supers writing by holding
137 * this mutex lock.
138 */
139 struct mutex device_list_mutex;
140 struct list_head devices;
141
142 /* devices not currently being allocated */
143 struct list_head alloc_list;
144 struct list_head list;
145
146 struct btrfs_fs_devices *seed;
147 int seeding;
148
149 int opened;
150
151 /* set when we find or add a device that doesn't have the
152 * nonrot flag set
153 */
154 int rotating;
155};
156
157#define BTRFS_BIO_INLINE_CSUM_SIZE 64
158
159/*
160 * we need the mirror number and stripe index to be passed around
161 * the call chain while we are processing end_io (especially errors).
162 * Really, what we need is a btrfs_bio structure that has this info
163 * and is properly sized with its stripe array, but we're not there
164 * quite yet. We have our own btrfs bioset, and all of the bios
165 * we allocate are actually btrfs_io_bios. We'll cram as much of
166 * struct btrfs_bio as we can into this over time.
167 */
168typedef void (btrfs_io_bio_end_io_t) (struct btrfs_io_bio *bio, int err);
169struct btrfs_io_bio {
170 unsigned long mirror_num;
171 unsigned long stripe_index;
172 u8 *csum;
173 u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
174 u8 *csum_allocated;
175 btrfs_io_bio_end_io_t *end_io;
176 struct bio bio;
177};
178
179static inline struct btrfs_io_bio *btrfs_io_bio(struct bio *bio)
180{
181 return container_of(bio, struct btrfs_io_bio, bio);
182}
183
184struct btrfs_bio_stripe {
185 struct btrfs_device *dev;
186 u64 physical;
187 u64 length; /* only used for discard mappings */
188};
189
190struct btrfs_bio;
191typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
192
193struct btrfs_bio {
194 atomic_t stripes_pending;
195 struct btrfs_fs_info *fs_info;
196 bio_end_io_t *end_io;
197 struct bio *orig_bio;
198 void *private;
199 atomic_t error;
200 int max_errors;
201 int num_stripes;
202 int mirror_num;
203 struct btrfs_bio_stripe stripes[];
204};
205
206struct btrfs_device_info {
207 struct btrfs_device *dev;
208 u64 dev_offset;
209 u64 max_avail;
210 u64 total_avail;
211};
212
213struct btrfs_raid_attr {
214 int sub_stripes; /* sub_stripes info for map */
215 int dev_stripes; /* stripes per dev */
216 int devs_max; /* max devs to use */
217 int devs_min; /* min devs needed */
218 int devs_increment; /* ndevs has to be a multiple of this */
219 int ncopies; /* how many copies to data has */
220};
221
222struct map_lookup {
223 u64 type;
224 int io_align;
225 int io_width;
226 int stripe_len;
227 int sector_size;
228 int num_stripes;
229 int sub_stripes;
230 struct btrfs_bio_stripe stripes[];
231};
232
233#define map_lookup_size(n) (sizeof(struct map_lookup) + \
234 (sizeof(struct btrfs_bio_stripe) * (n)))
235
236/*
237 * Restriper's general type filter
238 */
239#define BTRFS_BALANCE_DATA (1ULL << 0)
240#define BTRFS_BALANCE_SYSTEM (1ULL << 1)
241#define BTRFS_BALANCE_METADATA (1ULL << 2)
242
243#define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA | \
244 BTRFS_BALANCE_SYSTEM | \
245 BTRFS_BALANCE_METADATA)
246
247#define BTRFS_BALANCE_FORCE (1ULL << 3)
248#define BTRFS_BALANCE_RESUME (1ULL << 4)
249
250/*
251 * Balance filters
252 */
253#define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0)
254#define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1)
255#define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2)
256#define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3)
257#define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4)
258
259/*
260 * Profile changing flags. When SOFT is set we won't relocate chunk if
261 * it already has the target profile (even though it may be
262 * half-filled).
263 */
264#define BTRFS_BALANCE_ARGS_CONVERT (1ULL << 8)
265#define BTRFS_BALANCE_ARGS_SOFT (1ULL << 9)
266
267struct btrfs_balance_args;
268struct btrfs_balance_progress;
269struct btrfs_balance_control {
270 struct btrfs_fs_info *fs_info;
271
272 struct btrfs_balance_args data;
273 struct btrfs_balance_args meta;
274 struct btrfs_balance_args sys;
275
276 u64 flags;
277
278 struct btrfs_balance_progress stat;
279};
280
281int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
282 u64 end, u64 *length);
283
284#define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \
285 (sizeof(struct btrfs_bio_stripe) * (n)))
286
287int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
288 u64 logical, u64 *length,
289 struct btrfs_bio **bbio_ret, int mirror_num);
290int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
291 u64 chunk_start, u64 physical, u64 devid,
292 u64 **logical, int *naddrs, int *stripe_len);
293int btrfs_read_sys_array(struct btrfs_root *root);
294int btrfs_read_chunk_tree(struct btrfs_root *root);
295int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
296 struct btrfs_root *extent_root, u64 type);
297void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
298void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
299int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
300 int mirror_num, int async_submit);
301int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
302 fmode_t flags, void *holder);
303int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
304 struct btrfs_fs_devices **fs_devices_ret);
305int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
306void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info,
307 struct btrfs_fs_devices *fs_devices, int step);
308int btrfs_find_device_missing_or_by_path(struct btrfs_root *root,
309 char *device_path,
310 struct btrfs_device **device);
311struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
312 const u64 *devid,
313 const u8 *uuid);
314int btrfs_rm_device(struct btrfs_root *root, char *device_path);
315void btrfs_cleanup_fs_uuids(void);
316int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
317int btrfs_grow_device(struct btrfs_trans_handle *trans,
318 struct btrfs_device *device, u64 new_size);
319struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
320 u8 *uuid, u8 *fsid);
321int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
322int btrfs_init_new_device(struct btrfs_root *root, char *path);
323int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path,
324 struct btrfs_device **device_out);
325int btrfs_balance(struct btrfs_balance_control *bctl,
326 struct btrfs_ioctl_balance_args *bargs);
327int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
328int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
329int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
330int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
331int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
332int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info);
333int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
334int find_free_dev_extent(struct btrfs_trans_handle *trans,
335 struct btrfs_device *device, u64 num_bytes,
336 u64 *start, u64 *max_avail);
337void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
338int btrfs_get_dev_stats(struct btrfs_root *root,
339 struct btrfs_ioctl_get_dev_stats *stats);
340void btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
341int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
342int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
343 struct btrfs_fs_info *fs_info);
344void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
345 struct btrfs_device *srcdev);
346void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
347 struct btrfs_device *tgtdev);
348void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
349 struct btrfs_device *tgtdev);
350int btrfs_scratch_superblock(struct btrfs_device *device);
351int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree,
352 u64 logical, u64 len, int mirror_num);
353unsigned long btrfs_full_stripe_len(struct btrfs_root *root,
354 struct btrfs_mapping_tree *map_tree,
355 u64 logical);
356int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
357 struct btrfs_root *extent_root,
358 u64 chunk_offset, u64 chunk_size);
359static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
360 int index)
361{
362 atomic_inc(dev->dev_stat_values + index);
363 dev->dev_stats_dirty = 1;
364}
365
366static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
367 int index)
368{
369 return atomic_read(dev->dev_stat_values + index);
370}
371
372static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
373 int index)
374{
375 int ret;
376
377 ret = atomic_xchg(dev->dev_stat_values + index, 0);
378 dev->dev_stats_dirty = 1;
379 return ret;
380}
381
382static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
383 int index, unsigned long val)
384{
385 atomic_set(dev->dev_stat_values + index, val);
386 dev->dev_stats_dirty = 1;
387}
388
389static inline void btrfs_dev_stat_reset(struct btrfs_device *dev,
390 int index)
391{
392 btrfs_dev_stat_set(dev, index, 0);
393}
394#endif