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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/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 2007 Oracle. All rights reserved.
4 */
5
6#ifndef BTRFS_VOLUMES_H
7#define BTRFS_VOLUMES_H
8
9#include <linux/bio.h>
10#include <linux/sort.h>
11#include <linux/btrfs.h>
12#include "async-thread.h"
13
14extern struct mutex uuid_mutex;
15
16#define BTRFS_STRIPE_LEN SZ_64K
17
18struct buffer_head;
19struct btrfs_pending_bios {
20 struct bio *head;
21 struct bio *tail;
22};
23
24/*
25 * Use sequence counter to get consistent device stat data on
26 * 32-bit processors.
27 */
28#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
29#include <linux/seqlock.h>
30#define __BTRFS_NEED_DEVICE_DATA_ORDERED
31#define btrfs_device_data_ordered_init(device) \
32 seqcount_init(&device->data_seqcount)
33#else
34#define btrfs_device_data_ordered_init(device) do { } while (0)
35#endif
36
37#define BTRFS_DEV_STATE_WRITEABLE (0)
38#define BTRFS_DEV_STATE_IN_FS_METADATA (1)
39#define BTRFS_DEV_STATE_MISSING (2)
40#define BTRFS_DEV_STATE_REPLACE_TGT (3)
41#define BTRFS_DEV_STATE_FLUSH_SENT (4)
42
43struct btrfs_device {
44 struct list_head dev_list;
45 struct list_head dev_alloc_list;
46 struct btrfs_fs_devices *fs_devices;
47 struct btrfs_fs_info *fs_info;
48
49 struct rcu_string *name;
50
51 u64 generation;
52
53 spinlock_t io_lock ____cacheline_aligned;
54 int running_pending;
55 /* regular prio bios */
56 struct btrfs_pending_bios pending_bios;
57 /* sync bios */
58 struct btrfs_pending_bios pending_sync_bios;
59
60 struct block_device *bdev;
61
62 /* the mode sent to blkdev_get */
63 fmode_t mode;
64
65 unsigned long dev_state;
66 blk_status_t last_flush_error;
67 int flush_bio_sent;
68
69#ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED
70 seqcount_t data_seqcount;
71#endif
72
73 /* the internal btrfs device id */
74 u64 devid;
75
76 /* size of the device in memory */
77 u64 total_bytes;
78
79 /* size of the device on disk */
80 u64 disk_total_bytes;
81
82 /* bytes used */
83 u64 bytes_used;
84
85 /* optimal io alignment for this device */
86 u32 io_align;
87
88 /* optimal io width for this device */
89 u32 io_width;
90 /* type and info about this device */
91 u64 type;
92
93 /* minimal io size for this device */
94 u32 sector_size;
95
96 /* physical drive uuid (or lvm uuid) */
97 u8 uuid[BTRFS_UUID_SIZE];
98
99 /*
100 * size of the device on the current transaction
101 *
102 * This variant is update when committing the transaction,
103 * and protected by device_list_mutex
104 */
105 u64 commit_total_bytes;
106
107 /* bytes used on the current transaction */
108 u64 commit_bytes_used;
109 /*
110 * used to manage the device which is resized
111 *
112 * It is protected by chunk_lock.
113 */
114 struct list_head resized_list;
115
116 /* for sending down flush barriers */
117 struct bio *flush_bio;
118 struct completion flush_wait;
119
120 /* per-device scrub information */
121 struct scrub_ctx *scrub_ctx;
122
123 struct btrfs_work work;
124 struct rcu_head rcu;
125
126 /* readahead state */
127 atomic_t reada_in_flight;
128 u64 reada_next;
129 struct reada_zone *reada_curr_zone;
130 struct radix_tree_root reada_zones;
131 struct radix_tree_root reada_extents;
132
133 /* disk I/O failure stats. For detailed description refer to
134 * enum btrfs_dev_stat_values in ioctl.h */
135 int dev_stats_valid;
136
137 /* Counter to record the change of device stats */
138 atomic_t dev_stats_ccnt;
139 atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
140};
141
142/*
143 * If we read those variants at the context of their own lock, we needn't
144 * use the following helpers, reading them directly is safe.
145 */
146#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
147#define BTRFS_DEVICE_GETSET_FUNCS(name) \
148static inline u64 \
149btrfs_device_get_##name(const struct btrfs_device *dev) \
150{ \
151 u64 size; \
152 unsigned int seq; \
153 \
154 do { \
155 seq = read_seqcount_begin(&dev->data_seqcount); \
156 size = dev->name; \
157 } while (read_seqcount_retry(&dev->data_seqcount, seq)); \
158 return size; \
159} \
160 \
161static inline void \
162btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
163{ \
164 preempt_disable(); \
165 write_seqcount_begin(&dev->data_seqcount); \
166 dev->name = size; \
167 write_seqcount_end(&dev->data_seqcount); \
168 preempt_enable(); \
169}
170#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
171#define BTRFS_DEVICE_GETSET_FUNCS(name) \
172static inline u64 \
173btrfs_device_get_##name(const struct btrfs_device *dev) \
174{ \
175 u64 size; \
176 \
177 preempt_disable(); \
178 size = dev->name; \
179 preempt_enable(); \
180 return size; \
181} \
182 \
183static inline void \
184btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
185{ \
186 preempt_disable(); \
187 dev->name = size; \
188 preempt_enable(); \
189}
190#else
191#define BTRFS_DEVICE_GETSET_FUNCS(name) \
192static inline u64 \
193btrfs_device_get_##name(const struct btrfs_device *dev) \
194{ \
195 return dev->name; \
196} \
197 \
198static inline void \
199btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
200{ \
201 dev->name = size; \
202}
203#endif
204
205BTRFS_DEVICE_GETSET_FUNCS(total_bytes);
206BTRFS_DEVICE_GETSET_FUNCS(disk_total_bytes);
207BTRFS_DEVICE_GETSET_FUNCS(bytes_used);
208
209struct btrfs_fs_devices {
210 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
211
212 u64 num_devices;
213 u64 open_devices;
214 u64 rw_devices;
215 u64 missing_devices;
216 u64 total_rw_bytes;
217 u64 total_devices;
218 struct block_device *latest_bdev;
219
220 /* all of the devices in the FS, protected by a mutex
221 * so we can safely walk it to write out the supers without
222 * worrying about add/remove by the multi-device code.
223 * Scrubbing super can kick off supers writing by holding
224 * this mutex lock.
225 */
226 struct mutex device_list_mutex;
227 struct list_head devices;
228
229 struct list_head resized_devices;
230 /* devices not currently being allocated */
231 struct list_head alloc_list;
232 struct list_head list;
233
234 struct btrfs_fs_devices *seed;
235 int seeding;
236
237 int opened;
238
239 /* set when we find or add a device that doesn't have the
240 * nonrot flag set
241 */
242 int rotating;
243
244 struct btrfs_fs_info *fs_info;
245 /* sysfs kobjects */
246 struct kobject fsid_kobj;
247 struct kobject *device_dir_kobj;
248 struct completion kobj_unregister;
249};
250
251#define BTRFS_BIO_INLINE_CSUM_SIZE 64
252
253/*
254 * we need the mirror number and stripe index to be passed around
255 * the call chain while we are processing end_io (especially errors).
256 * Really, what we need is a btrfs_bio structure that has this info
257 * and is properly sized with its stripe array, but we're not there
258 * quite yet. We have our own btrfs bioset, and all of the bios
259 * we allocate are actually btrfs_io_bios. We'll cram as much of
260 * struct btrfs_bio as we can into this over time.
261 */
262typedef void (btrfs_io_bio_end_io_t) (struct btrfs_io_bio *bio, int err);
263struct btrfs_io_bio {
264 unsigned int mirror_num;
265 unsigned int stripe_index;
266 u64 logical;
267 u8 *csum;
268 u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
269 u8 *csum_allocated;
270 btrfs_io_bio_end_io_t *end_io;
271 struct bvec_iter iter;
272 /*
273 * This member must come last, bio_alloc_bioset will allocate enough
274 * bytes for entire btrfs_io_bio but relies on bio being last.
275 */
276 struct bio bio;
277};
278
279static inline struct btrfs_io_bio *btrfs_io_bio(struct bio *bio)
280{
281 return container_of(bio, struct btrfs_io_bio, bio);
282}
283
284struct btrfs_bio_stripe {
285 struct btrfs_device *dev;
286 u64 physical;
287 u64 length; /* only used for discard mappings */
288};
289
290struct btrfs_bio;
291typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
292
293struct btrfs_bio {
294 refcount_t refs;
295 atomic_t stripes_pending;
296 struct btrfs_fs_info *fs_info;
297 u64 map_type; /* get from map_lookup->type */
298 bio_end_io_t *end_io;
299 struct bio *orig_bio;
300 unsigned long flags;
301 void *private;
302 atomic_t error;
303 int max_errors;
304 int num_stripes;
305 int mirror_num;
306 int num_tgtdevs;
307 int *tgtdev_map;
308 /*
309 * logical block numbers for the start of each stripe
310 * The last one or two are p/q. These are sorted,
311 * so raid_map[0] is the start of our full stripe
312 */
313 u64 *raid_map;
314 struct btrfs_bio_stripe stripes[];
315};
316
317struct btrfs_device_info {
318 struct btrfs_device *dev;
319 u64 dev_offset;
320 u64 max_avail;
321 u64 total_avail;
322};
323
324struct btrfs_raid_attr {
325 int sub_stripes; /* sub_stripes info for map */
326 int dev_stripes; /* stripes per dev */
327 int devs_max; /* max devs to use */
328 int devs_min; /* min devs needed */
329 int tolerated_failures; /* max tolerated fail devs */
330 int devs_increment; /* ndevs has to be a multiple of this */
331 int ncopies; /* how many copies to data has */
332};
333
334extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES];
335extern const int btrfs_raid_mindev_error[BTRFS_NR_RAID_TYPES];
336extern const u64 btrfs_raid_group[BTRFS_NR_RAID_TYPES];
337
338struct map_lookup {
339 u64 type;
340 int io_align;
341 int io_width;
342 u64 stripe_len;
343 int num_stripes;
344 int sub_stripes;
345 struct btrfs_bio_stripe stripes[];
346};
347
348#define map_lookup_size(n) (sizeof(struct map_lookup) + \
349 (sizeof(struct btrfs_bio_stripe) * (n)))
350
351struct btrfs_balance_args;
352struct btrfs_balance_progress;
353struct btrfs_balance_control {
354 struct btrfs_fs_info *fs_info;
355
356 struct btrfs_balance_args data;
357 struct btrfs_balance_args meta;
358 struct btrfs_balance_args sys;
359
360 u64 flags;
361
362 struct btrfs_balance_progress stat;
363};
364
365enum btrfs_map_op {
366 BTRFS_MAP_READ,
367 BTRFS_MAP_WRITE,
368 BTRFS_MAP_DISCARD,
369 BTRFS_MAP_GET_READ_MIRRORS,
370};
371
372static inline enum btrfs_map_op btrfs_op(struct bio *bio)
373{
374 switch (bio_op(bio)) {
375 case REQ_OP_DISCARD:
376 return BTRFS_MAP_DISCARD;
377 case REQ_OP_WRITE:
378 return BTRFS_MAP_WRITE;
379 default:
380 WARN_ON_ONCE(1);
381 case REQ_OP_READ:
382 return BTRFS_MAP_READ;
383 }
384}
385
386int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
387 u64 end, u64 *length);
388void btrfs_get_bbio(struct btrfs_bio *bbio);
389void btrfs_put_bbio(struct btrfs_bio *bbio);
390int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
391 u64 logical, u64 *length,
392 struct btrfs_bio **bbio_ret, int mirror_num);
393int btrfs_map_sblock(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
394 u64 logical, u64 *length,
395 struct btrfs_bio **bbio_ret);
396int btrfs_rmap_block(struct btrfs_fs_info *fs_info,
397 u64 chunk_start, u64 physical, u64 devid,
398 u64 **logical, int *naddrs, int *stripe_len);
399int btrfs_read_sys_array(struct btrfs_fs_info *fs_info);
400int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info);
401int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
402 struct btrfs_fs_info *fs_info, u64 type);
403void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
404void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
405blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
406 int mirror_num, int async_submit);
407int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
408 fmode_t flags, void *holder);
409int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
410 struct btrfs_fs_devices **fs_devices_ret);
411int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
412void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices, int step);
413void btrfs_assign_next_active_device(struct btrfs_fs_info *fs_info,
414 struct btrfs_device *device, struct btrfs_device *this_dev);
415int btrfs_find_device_missing_or_by_path(struct btrfs_fs_info *fs_info,
416 const char *device_path,
417 struct btrfs_device **device);
418int btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info, u64 devid,
419 const char *devpath,
420 struct btrfs_device **device);
421struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
422 const u64 *devid,
423 const u8 *uuid);
424int btrfs_rm_device(struct btrfs_fs_info *fs_info,
425 const char *device_path, u64 devid);
426void __exit btrfs_cleanup_fs_uuids(void);
427int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
428int btrfs_grow_device(struct btrfs_trans_handle *trans,
429 struct btrfs_device *device, u64 new_size);
430struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
431 u8 *uuid, u8 *fsid);
432int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
433int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *path);
434int btrfs_init_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
435 const char *device_path,
436 struct btrfs_device *srcdev,
437 struct btrfs_device **device_out);
438int btrfs_balance(struct btrfs_balance_control *bctl,
439 struct btrfs_ioctl_balance_args *bargs);
440int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
441int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
442int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
443int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
444int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
445int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info);
446int btrfs_chunk_readonly(struct btrfs_fs_info *fs_info, u64 chunk_offset);
447int find_free_dev_extent_start(struct btrfs_transaction *transaction,
448 struct btrfs_device *device, u64 num_bytes,
449 u64 search_start, u64 *start, u64 *max_avail);
450int find_free_dev_extent(struct btrfs_trans_handle *trans,
451 struct btrfs_device *device, u64 num_bytes,
452 u64 *start, u64 *max_avail);
453void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
454int btrfs_get_dev_stats(struct btrfs_fs_info *fs_info,
455 struct btrfs_ioctl_get_dev_stats *stats);
456void btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
457int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
458int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
459 struct btrfs_fs_info *fs_info);
460void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_fs_info *fs_info,
461 struct btrfs_device *srcdev);
462void btrfs_rm_dev_replace_free_srcdev(struct btrfs_fs_info *fs_info,
463 struct btrfs_device *srcdev);
464void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
465 struct btrfs_device *tgtdev);
466void btrfs_scratch_superblocks(struct block_device *bdev, const char *device_path);
467int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info,
468 u64 logical, u64 len);
469unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
470 u64 logical);
471int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
472 struct btrfs_fs_info *fs_info,
473 u64 chunk_offset, u64 chunk_size);
474int btrfs_remove_chunk(struct btrfs_trans_handle *trans,
475 struct btrfs_fs_info *fs_info, u64 chunk_offset);
476
477static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
478 int index)
479{
480 atomic_inc(dev->dev_stat_values + index);
481 /*
482 * This memory barrier orders stores updating statistics before stores
483 * updating dev_stats_ccnt.
484 *
485 * It pairs with smp_rmb() in btrfs_run_dev_stats().
486 */
487 smp_mb__before_atomic();
488 atomic_inc(&dev->dev_stats_ccnt);
489}
490
491static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
492 int index)
493{
494 return atomic_read(dev->dev_stat_values + index);
495}
496
497static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
498 int index)
499{
500 int ret;
501
502 ret = atomic_xchg(dev->dev_stat_values + index, 0);
503 /*
504 * atomic_xchg implies a full memory barriers as per atomic_t.txt:
505 * - RMW operations that have a return value are fully ordered;
506 *
507 * This implicit memory barriers is paired with the smp_rmb in
508 * btrfs_run_dev_stats
509 */
510 atomic_inc(&dev->dev_stats_ccnt);
511 return ret;
512}
513
514static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
515 int index, unsigned long val)
516{
517 atomic_set(dev->dev_stat_values + index, val);
518 /*
519 * This memory barrier orders stores updating statistics before stores
520 * updating dev_stats_ccnt.
521 *
522 * It pairs with smp_rmb() in btrfs_run_dev_stats().
523 */
524 smp_mb__before_atomic();
525 atomic_inc(&dev->dev_stats_ccnt);
526}
527
528static inline void btrfs_dev_stat_reset(struct btrfs_device *dev,
529 int index)
530{
531 btrfs_dev_stat_set(dev, index, 0);
532}
533
534/*
535 * Convert block group flags (BTRFS_BLOCK_GROUP_*) to btrfs_raid_types, which
536 * can be used as index to access btrfs_raid_array[].
537 */
538static inline enum btrfs_raid_types btrfs_bg_flags_to_raid_index(u64 flags)
539{
540 if (flags & BTRFS_BLOCK_GROUP_RAID10)
541 return BTRFS_RAID_RAID10;
542 else if (flags & BTRFS_BLOCK_GROUP_RAID1)
543 return BTRFS_RAID_RAID1;
544 else if (flags & BTRFS_BLOCK_GROUP_DUP)
545 return BTRFS_RAID_DUP;
546 else if (flags & BTRFS_BLOCK_GROUP_RAID0)
547 return BTRFS_RAID_RAID0;
548 else if (flags & BTRFS_BLOCK_GROUP_RAID5)
549 return BTRFS_RAID_RAID5;
550 else if (flags & BTRFS_BLOCK_GROUP_RAID6)
551 return BTRFS_RAID_RAID6;
552
553 return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */
554}
555
556void btrfs_update_commit_device_size(struct btrfs_fs_info *fs_info);
557void btrfs_update_commit_device_bytes_used(struct btrfs_transaction *trans);
558
559struct list_head *btrfs_get_fs_uuids(void);
560void btrfs_set_fs_info_ptr(struct btrfs_fs_info *fs_info);
561void btrfs_reset_fs_info_ptr(struct btrfs_fs_info *fs_info);
562bool btrfs_check_rw_degradable(struct btrfs_fs_info *fs_info,
563 struct btrfs_device *failing_dev);
564
565#endif