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