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 extern struct mutex uuid_mutex;
28
29 #define BTRFS_STRIPE_LEN (64 * 1024)
30
31 struct buffer_head;
32 struct 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
50 struct btrfs_device {
51 struct list_head dev_list;
52 struct list_head dev_alloc_list;
53 struct btrfs_fs_devices *fs_devices;
54
55 struct btrfs_root *dev_root;
56
57 struct rcu_string *name;
58
59 u64 generation;
60
61 spinlock_t io_lock ____cacheline_aligned;
62 int running_pending;
63 /* regular prio bios */
64 struct btrfs_pending_bios pending_bios;
65 /* WRITE_SYNC bios */
66 struct btrfs_pending_bios pending_sync_bios;
67
68 struct block_device *bdev;
69
70 /* the mode sent to blkdev_get */
71 fmode_t mode;
72
73 int writeable;
74 int in_fs_metadata;
75 int missing;
76 int can_discard;
77 int is_tgtdev_for_dev_replace;
78
79 #ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED
80 seqcount_t data_seqcount;
81 #endif
82
83 /* the internal btrfs device id */
84 u64 devid;
85
86 /* size of the device in memory */
87 u64 total_bytes;
88
89 /* size of the device on disk */
90 u64 disk_total_bytes;
91
92 /* bytes used */
93 u64 bytes_used;
94
95 /* optimal io alignment for this device */
96 u32 io_align;
97
98 /* optimal io width for this device */
99 u32 io_width;
100 /* type and info about this device */
101 u64 type;
102
103 /* minimal io size for this device */
104 u32 sector_size;
105
106 /* physical drive uuid (or lvm uuid) */
107 u8 uuid[BTRFS_UUID_SIZE];
108
109 /*
110 * size of the device on the current transaction
111 *
112 * This variant is update when committing the transaction,
113 * and protected by device_list_mutex
114 */
115 u64 commit_total_bytes;
116
117 /* bytes used on the current transaction */
118 u64 commit_bytes_used;
119 /*
120 * used to manage the device which is resized
121 *
122 * It is protected by chunk_lock.
123 */
124 struct list_head resized_list;
125
126 /* for sending down flush barriers */
127 int nobarriers;
128 struct bio *flush_bio;
129 struct completion flush_wait;
130
131 /* per-device scrub information */
132 struct scrub_ctx *scrub_device;
133
134 struct btrfs_work work;
135 struct rcu_head rcu;
136 struct work_struct rcu_work;
137
138 /* readahead state */
139 spinlock_t reada_lock;
140 atomic_t reada_in_flight;
141 u64 reada_next;
142 struct reada_zone *reada_curr_zone;
143 struct radix_tree_root reada_zones;
144 struct radix_tree_root reada_extents;
145
146 /* disk I/O failure stats. For detailed description refer to
147 * enum btrfs_dev_stat_values in ioctl.h */
148 int dev_stats_valid;
149
150 /* Counter to record the change of device stats */
151 atomic_t dev_stats_ccnt;
152 atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
153 };
154
155 /*
156 * If we read those variants at the context of their own lock, we needn't
157 * use the following helpers, reading them directly is safe.
158 */
159 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
160 #define BTRFS_DEVICE_GETSET_FUNCS(name) \
161 static inline u64 \
162 btrfs_device_get_##name(const struct btrfs_device *dev) \
163 { \
164 u64 size; \
165 unsigned int seq; \
166 \
167 do { \
168 seq = read_seqcount_begin(&dev->data_seqcount); \
169 size = dev->name; \
170 } while (read_seqcount_retry(&dev->data_seqcount, seq)); \
171 return size; \
172 } \
173 \
174 static inline void \
175 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
176 { \
177 preempt_disable(); \
178 write_seqcount_begin(&dev->data_seqcount); \
179 dev->name = size; \
180 write_seqcount_end(&dev->data_seqcount); \
181 preempt_enable(); \
182 }
183 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
184 #define BTRFS_DEVICE_GETSET_FUNCS(name) \
185 static inline u64 \
186 btrfs_device_get_##name(const struct btrfs_device *dev) \
187 { \
188 u64 size; \
189 \
190 preempt_disable(); \
191 size = dev->name; \
192 preempt_enable(); \
193 return size; \
194 } \
195 \
196 static inline void \
197 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
198 { \
199 preempt_disable(); \
200 dev->name = size; \
201 preempt_enable(); \
202 }
203 #else
204 #define BTRFS_DEVICE_GETSET_FUNCS(name) \
205 static inline u64 \
206 btrfs_device_get_##name(const struct btrfs_device *dev) \
207 { \
208 return dev->name; \
209 } \
210 \
211 static inline void \
212 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
213 { \
214 dev->name = size; \
215 }
216 #endif
217
218 BTRFS_DEVICE_GETSET_FUNCS(total_bytes);
219 BTRFS_DEVICE_GETSET_FUNCS(disk_total_bytes);
220 BTRFS_DEVICE_GETSET_FUNCS(bytes_used);
221
222 struct btrfs_fs_devices {
223 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
224
225 u64 num_devices;
226 u64 open_devices;
227 u64 rw_devices;
228 u64 missing_devices;
229 u64 total_rw_bytes;
230 u64 total_devices;
231 struct block_device *latest_bdev;
232
233 /* all of the devices in the FS, protected by a mutex
234 * so we can safely walk it to write out the supers without
235 * worrying about add/remove by the multi-device code.
236 * Scrubbing super can kick off supers writing by holding
237 * this mutex lock.
238 */
239 struct mutex device_list_mutex;
240 struct list_head devices;
241
242 struct list_head resized_devices;
243 /* devices not currently being allocated */
244 struct list_head alloc_list;
245 struct list_head list;
246
247 struct btrfs_fs_devices *seed;
248 int seeding;
249
250 int opened;
251
252 /* set when we find or add a device that doesn't have the
253 * nonrot flag set
254 */
255 int rotating;
256 };
257
258 #define BTRFS_BIO_INLINE_CSUM_SIZE 64
259
260 /*
261 * we need the mirror number and stripe index to be passed around
262 * the call chain while we are processing end_io (especially errors).
263 * Really, what we need is a btrfs_bio structure that has this info
264 * and is properly sized with its stripe array, but we're not there
265 * quite yet. We have our own btrfs bioset, and all of the bios
266 * we allocate are actually btrfs_io_bios. We'll cram as much of
267 * struct btrfs_bio as we can into this over time.
268 */
269 typedef void (btrfs_io_bio_end_io_t) (struct btrfs_io_bio *bio, int err);
270 struct btrfs_io_bio {
271 unsigned int mirror_num;
272 unsigned int stripe_index;
273 u64 logical;
274 u8 *csum;
275 u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
276 u8 *csum_allocated;
277 btrfs_io_bio_end_io_t *end_io;
278 struct bio bio;
279 };
280
btrfs_io_bio(struct bio * bio)281 static inline struct btrfs_io_bio *btrfs_io_bio(struct bio *bio)
282 {
283 return container_of(bio, struct btrfs_io_bio, bio);
284 }
285
286 struct btrfs_bio_stripe {
287 struct btrfs_device *dev;
288 u64 physical;
289 u64 length; /* only used for discard mappings */
290 };
291
292 struct btrfs_bio;
293 typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
294
295 #define BTRFS_BIO_ORIG_BIO_SUBMITTED 0x1
296
297 struct btrfs_bio {
298 atomic_t stripes_pending;
299 struct btrfs_fs_info *fs_info;
300 bio_end_io_t *end_io;
301 struct bio *orig_bio;
302 unsigned long flags;
303 void *private;
304 atomic_t error;
305 int max_errors;
306 int num_stripes;
307 int mirror_num;
308 struct btrfs_bio_stripe stripes[];
309 };
310
311 struct btrfs_device_info {
312 struct btrfs_device *dev;
313 u64 dev_offset;
314 u64 max_avail;
315 u64 total_avail;
316 };
317
318 struct btrfs_raid_attr {
319 int sub_stripes; /* sub_stripes info for map */
320 int dev_stripes; /* stripes per dev */
321 int devs_max; /* max devs to use */
322 int devs_min; /* min devs needed */
323 int devs_increment; /* ndevs has to be a multiple of this */
324 int ncopies; /* how many copies to data has */
325 };
326
327 struct map_lookup {
328 u64 type;
329 int io_align;
330 int io_width;
331 int stripe_len;
332 int sector_size;
333 int num_stripes;
334 int sub_stripes;
335 struct btrfs_bio_stripe stripes[];
336 };
337
338 #define map_lookup_size(n) (sizeof(struct map_lookup) + \
339 (sizeof(struct btrfs_bio_stripe) * (n)))
340
341 /*
342 * Restriper's general type filter
343 */
344 #define BTRFS_BALANCE_DATA (1ULL << 0)
345 #define BTRFS_BALANCE_SYSTEM (1ULL << 1)
346 #define BTRFS_BALANCE_METADATA (1ULL << 2)
347
348 #define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA | \
349 BTRFS_BALANCE_SYSTEM | \
350 BTRFS_BALANCE_METADATA)
351
352 #define BTRFS_BALANCE_FORCE (1ULL << 3)
353 #define BTRFS_BALANCE_RESUME (1ULL << 4)
354
355 /*
356 * Balance filters
357 */
358 #define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0)
359 #define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1)
360 #define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2)
361 #define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3)
362 #define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4)
363 #define BTRFS_BALANCE_ARGS_LIMIT (1ULL << 5)
364
365 /*
366 * Profile changing flags. When SOFT is set we won't relocate chunk if
367 * it already has the target profile (even though it may be
368 * half-filled).
369 */
370 #define BTRFS_BALANCE_ARGS_CONVERT (1ULL << 8)
371 #define BTRFS_BALANCE_ARGS_SOFT (1ULL << 9)
372
373 struct btrfs_balance_args;
374 struct btrfs_balance_progress;
375 struct btrfs_balance_control {
376 struct btrfs_fs_info *fs_info;
377
378 struct btrfs_balance_args data;
379 struct btrfs_balance_args meta;
380 struct btrfs_balance_args sys;
381
382 u64 flags;
383
384 struct btrfs_balance_progress stat;
385 };
386
387 int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
388 u64 end, u64 *length);
389
390 #define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \
391 (sizeof(struct btrfs_bio_stripe) * (n)))
392
393 int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
394 u64 logical, u64 *length,
395 struct btrfs_bio **bbio_ret, int mirror_num);
396 int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
397 u64 chunk_start, u64 physical, u64 devid,
398 u64 **logical, int *naddrs, int *stripe_len);
399 int btrfs_read_sys_array(struct btrfs_root *root);
400 int btrfs_read_chunk_tree(struct btrfs_root *root);
401 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
402 struct btrfs_root *extent_root, u64 type);
403 void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
404 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
405 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
406 int mirror_num, int async_submit);
407 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
408 fmode_t flags, void *holder);
409 int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
410 struct btrfs_fs_devices **fs_devices_ret);
411 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
412 void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info,
413 struct btrfs_fs_devices *fs_devices, int step);
414 int btrfs_find_device_missing_or_by_path(struct btrfs_root *root,
415 char *device_path,
416 struct btrfs_device **device);
417 struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
418 const u64 *devid,
419 const u8 *uuid);
420 int btrfs_rm_device(struct btrfs_root *root, char *device_path);
421 void btrfs_cleanup_fs_uuids(void);
422 int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
423 int btrfs_grow_device(struct btrfs_trans_handle *trans,
424 struct btrfs_device *device, u64 new_size);
425 struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
426 u8 *uuid, u8 *fsid);
427 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
428 int btrfs_init_new_device(struct btrfs_root *root, char *path);
429 int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path,
430 struct btrfs_device *srcdev,
431 struct btrfs_device **device_out);
432 int btrfs_balance(struct btrfs_balance_control *bctl,
433 struct btrfs_ioctl_balance_args *bargs);
434 int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
435 int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
436 int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
437 int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
438 int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
439 int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info);
440 int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
441 int find_free_dev_extent(struct btrfs_trans_handle *trans,
442 struct btrfs_device *device, u64 num_bytes,
443 u64 *start, u64 *max_avail);
444 void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
445 int btrfs_get_dev_stats(struct btrfs_root *root,
446 struct btrfs_ioctl_get_dev_stats *stats);
447 void btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
448 int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
449 int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
450 struct btrfs_fs_info *fs_info);
451 void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
452 struct btrfs_device *srcdev);
453 void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
454 struct btrfs_device *tgtdev);
455 void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
456 struct btrfs_device *tgtdev);
457 int btrfs_scratch_superblock(struct btrfs_device *device);
458 int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree,
459 u64 logical, u64 len, int mirror_num);
460 unsigned long btrfs_full_stripe_len(struct btrfs_root *root,
461 struct btrfs_mapping_tree *map_tree,
462 u64 logical);
463 int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
464 struct btrfs_root *extent_root,
465 u64 chunk_offset, u64 chunk_size);
466 int btrfs_remove_chunk(struct btrfs_trans_handle *trans,
467 struct btrfs_root *root, u64 chunk_offset);
468
btrfs_dev_stats_dirty(struct btrfs_device * dev)469 static inline int btrfs_dev_stats_dirty(struct btrfs_device *dev)
470 {
471 return atomic_read(&dev->dev_stats_ccnt);
472 }
473
btrfs_dev_stat_inc(struct btrfs_device * dev,int index)474 static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
475 int index)
476 {
477 atomic_inc(dev->dev_stat_values + index);
478 smp_mb__before_atomic();
479 atomic_inc(&dev->dev_stats_ccnt);
480 }
481
btrfs_dev_stat_read(struct btrfs_device * dev,int index)482 static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
483 int index)
484 {
485 return atomic_read(dev->dev_stat_values + index);
486 }
487
btrfs_dev_stat_read_and_reset(struct btrfs_device * dev,int index)488 static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
489 int index)
490 {
491 int ret;
492
493 ret = atomic_xchg(dev->dev_stat_values + index, 0);
494 smp_mb__before_atomic();
495 atomic_inc(&dev->dev_stats_ccnt);
496 return ret;
497 }
498
btrfs_dev_stat_set(struct btrfs_device * dev,int index,unsigned long val)499 static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
500 int index, unsigned long val)
501 {
502 atomic_set(dev->dev_stat_values + index, val);
503 smp_mb__before_atomic();
504 atomic_inc(&dev->dev_stats_ccnt);
505 }
506
btrfs_dev_stat_reset(struct btrfs_device * dev,int index)507 static inline void btrfs_dev_stat_reset(struct btrfs_device *dev,
508 int index)
509 {
510 btrfs_dev_stat_set(dev, index, 0);
511 }
512
513 void btrfs_update_commit_device_size(struct btrfs_fs_info *fs_info);
514 void btrfs_update_commit_device_bytes_used(struct btrfs_root *root,
515 struct btrfs_transaction *transaction);
516 #endif
517