ocfs2: fix locking for res->tracking and dlm->tracking_list
[linux/fpc-iii.git] / fs / btrfs / volumes.h
blobd5c84f6b13538a338d90560b6520be4fe56c3125
1 /*
2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #ifndef __BTRFS_VOLUMES_
20 #define __BTRFS_VOLUMES_
22 #include <linux/bio.h>
23 #include <linux/sort.h>
24 #include <linux/btrfs.h>
25 #include "async-thread.h"
27 extern struct mutex uuid_mutex;
29 #define BTRFS_STRIPE_LEN (64 * 1024)
31 struct buffer_head;
32 struct btrfs_pending_bios {
33 struct bio *head;
34 struct bio *tail;
38 * Use sequence counter to get consistent device stat data on
39 * 32-bit processors.
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
50 struct btrfs_device {
51 struct list_head dev_list;
52 struct list_head dev_alloc_list;
53 struct btrfs_fs_devices *fs_devices;
55 struct btrfs_root *dev_root;
57 struct rcu_string *name;
59 u64 generation;
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;
68 struct block_device *bdev;
70 /* the mode sent to blkdev_get */
71 fmode_t mode;
73 int writeable;
74 int in_fs_metadata;
75 int missing;
76 int can_discard;
77 int is_tgtdev_for_dev_replace;
79 #ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED
80 seqcount_t data_seqcount;
81 #endif
83 /* the internal btrfs device id */
84 u64 devid;
86 /* size of the device in memory */
87 u64 total_bytes;
89 /* size of the device on disk */
90 u64 disk_total_bytes;
92 /* bytes used */
93 u64 bytes_used;
95 /* optimal io alignment for this device */
96 u32 io_align;
98 /* optimal io width for this device */
99 u32 io_width;
100 /* type and info about this device */
101 u64 type;
103 /* minimal io size for this device */
104 u32 sector_size;
106 /* physical drive uuid (or lvm uuid) */
107 u8 uuid[BTRFS_UUID_SIZE];
110 * size of the device on the current transaction
112 * This variant is update when committing the transaction,
113 * and protected by device_list_mutex
115 u64 commit_total_bytes;
117 /* bytes used on the current transaction */
118 u64 commit_bytes_used;
120 * used to manage the device which is resized
122 * It is protected by chunk_lock.
124 struct list_head resized_list;
126 /* for sending down flush barriers */
127 int nobarriers;
128 struct bio *flush_bio;
129 struct completion flush_wait;
131 /* per-device scrub information */
132 struct scrub_ctx *scrub_device;
134 struct btrfs_work work;
135 struct rcu_head rcu;
136 struct work_struct rcu_work;
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;
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;
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];
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.
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) \
164 u64 size; \
165 unsigned int seq; \
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; \
174 static inline void \
175 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
177 preempt_disable(); \
178 write_seqcount_begin(&dev->data_seqcount); \
179 dev->name = size; \
180 write_seqcount_end(&dev->data_seqcount); \
181 preempt_enable(); \
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) \
188 u64 size; \
190 preempt_disable(); \
191 size = dev->name; \
192 preempt_enable(); \
193 return size; \
196 static inline void \
197 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
199 preempt_disable(); \
200 dev->name = size; \
201 preempt_enable(); \
203 #else
204 #define BTRFS_DEVICE_GETSET_FUNCS(name) \
205 static inline u64 \
206 btrfs_device_get_##name(const struct btrfs_device *dev) \
208 return dev->name; \
211 static inline void \
212 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
214 dev->name = size; \
216 #endif
218 BTRFS_DEVICE_GETSET_FUNCS(total_bytes);
219 BTRFS_DEVICE_GETSET_FUNCS(disk_total_bytes);
220 BTRFS_DEVICE_GETSET_FUNCS(bytes_used);
222 struct btrfs_fs_devices {
223 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
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;
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.
239 struct mutex device_list_mutex;
240 struct list_head devices;
242 struct list_head resized_devices;
243 /* devices not currently being allocated */
244 struct list_head alloc_list;
245 struct list_head list;
247 struct btrfs_fs_devices *seed;
248 int seeding;
250 int opened;
252 /* set when we find or add a device that doesn't have the
253 * nonrot flag set
255 int rotating;
257 struct btrfs_fs_info *fs_info;
258 /* sysfs kobjects */
259 struct kobject fsid_kobj;
260 struct kobject *device_dir_kobj;
261 struct completion kobj_unregister;
264 #define BTRFS_BIO_INLINE_CSUM_SIZE 64
267 * we need the mirror number and stripe index to be passed around
268 * the call chain while we are processing end_io (especially errors).
269 * Really, what we need is a btrfs_bio structure that has this info
270 * and is properly sized with its stripe array, but we're not there
271 * quite yet. We have our own btrfs bioset, and all of the bios
272 * we allocate are actually btrfs_io_bios. We'll cram as much of
273 * struct btrfs_bio as we can into this over time.
275 typedef void (btrfs_io_bio_end_io_t) (struct btrfs_io_bio *bio, int err);
276 struct btrfs_io_bio {
277 unsigned int mirror_num;
278 unsigned int stripe_index;
279 u64 logical;
280 u8 *csum;
281 u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
282 u8 *csum_allocated;
283 btrfs_io_bio_end_io_t *end_io;
284 struct bio bio;
287 static inline struct btrfs_io_bio *btrfs_io_bio(struct bio *bio)
289 return container_of(bio, struct btrfs_io_bio, bio);
292 struct btrfs_bio_stripe {
293 struct btrfs_device *dev;
294 u64 physical;
295 u64 length; /* only used for discard mappings */
298 struct btrfs_bio;
299 typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
301 struct btrfs_bio {
302 atomic_t refs;
303 atomic_t stripes_pending;
304 struct btrfs_fs_info *fs_info;
305 u64 map_type; /* get from map_lookup->type */
306 bio_end_io_t *end_io;
307 struct bio *orig_bio;
308 unsigned long flags;
309 void *private;
310 atomic_t error;
311 int max_errors;
312 int num_stripes;
313 int mirror_num;
314 int num_tgtdevs;
315 int *tgtdev_map;
317 * logical block numbers for the start of each stripe
318 * The last one or two are p/q. These are sorted,
319 * so raid_map[0] is the start of our full stripe
321 u64 *raid_map;
322 struct btrfs_bio_stripe stripes[];
325 struct btrfs_device_info {
326 struct btrfs_device *dev;
327 u64 dev_offset;
328 u64 max_avail;
329 u64 total_avail;
332 struct btrfs_raid_attr {
333 int sub_stripes; /* sub_stripes info for map */
334 int dev_stripes; /* stripes per dev */
335 int devs_max; /* max devs to use */
336 int devs_min; /* min devs needed */
337 int tolerated_failures; /* max tolerated fail devs */
338 int devs_increment; /* ndevs has to be a multiple of this */
339 int ncopies; /* how many copies to data has */
342 extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES];
344 extern const u64 btrfs_raid_group[BTRFS_NR_RAID_TYPES];
346 struct map_lookup {
347 u64 type;
348 int io_align;
349 int io_width;
350 int stripe_len;
351 int sector_size;
352 int num_stripes;
353 int sub_stripes;
354 struct btrfs_bio_stripe stripes[];
357 #define map_lookup_size(n) (sizeof(struct map_lookup) + \
358 (sizeof(struct btrfs_bio_stripe) * (n)))
361 * Restriper's general type filter
363 #define BTRFS_BALANCE_DATA (1ULL << 0)
364 #define BTRFS_BALANCE_SYSTEM (1ULL << 1)
365 #define BTRFS_BALANCE_METADATA (1ULL << 2)
367 #define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA | \
368 BTRFS_BALANCE_SYSTEM | \
369 BTRFS_BALANCE_METADATA)
371 #define BTRFS_BALANCE_FORCE (1ULL << 3)
372 #define BTRFS_BALANCE_RESUME (1ULL << 4)
375 * Balance filters
377 #define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0)
378 #define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1)
379 #define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2)
380 #define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3)
381 #define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4)
382 #define BTRFS_BALANCE_ARGS_LIMIT (1ULL << 5)
383 #define BTRFS_BALANCE_ARGS_LIMIT_RANGE (1ULL << 6)
384 #define BTRFS_BALANCE_ARGS_STRIPES_RANGE (1ULL << 7)
385 #define BTRFS_BALANCE_ARGS_USAGE_RANGE (1ULL << 10)
387 #define BTRFS_BALANCE_ARGS_MASK \
388 (BTRFS_BALANCE_ARGS_PROFILES | \
389 BTRFS_BALANCE_ARGS_USAGE | \
390 BTRFS_BALANCE_ARGS_DEVID | \
391 BTRFS_BALANCE_ARGS_DRANGE | \
392 BTRFS_BALANCE_ARGS_VRANGE | \
393 BTRFS_BALANCE_ARGS_LIMIT | \
394 BTRFS_BALANCE_ARGS_LIMIT_RANGE | \
395 BTRFS_BALANCE_ARGS_STRIPES_RANGE | \
396 BTRFS_BALANCE_ARGS_USAGE_RANGE)
399 * Profile changing flags. When SOFT is set we won't relocate chunk if
400 * it already has the target profile (even though it may be
401 * half-filled).
403 #define BTRFS_BALANCE_ARGS_CONVERT (1ULL << 8)
404 #define BTRFS_BALANCE_ARGS_SOFT (1ULL << 9)
406 struct btrfs_balance_args;
407 struct btrfs_balance_progress;
408 struct btrfs_balance_control {
409 struct btrfs_fs_info *fs_info;
411 struct btrfs_balance_args data;
412 struct btrfs_balance_args meta;
413 struct btrfs_balance_args sys;
415 u64 flags;
417 struct btrfs_balance_progress stat;
420 int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
421 u64 end, u64 *length);
422 void btrfs_get_bbio(struct btrfs_bio *bbio);
423 void btrfs_put_bbio(struct btrfs_bio *bbio);
424 int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
425 u64 logical, u64 *length,
426 struct btrfs_bio **bbio_ret, int mirror_num);
427 int btrfs_map_sblock(struct btrfs_fs_info *fs_info, int rw,
428 u64 logical, u64 *length,
429 struct btrfs_bio **bbio_ret, int mirror_num,
430 int need_raid_map);
431 int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
432 u64 chunk_start, u64 physical, u64 devid,
433 u64 **logical, int *naddrs, int *stripe_len);
434 int btrfs_read_sys_array(struct btrfs_root *root);
435 int btrfs_read_chunk_tree(struct btrfs_root *root);
436 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
437 struct btrfs_root *extent_root, u64 type);
438 void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
439 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
440 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
441 int mirror_num, int async_submit);
442 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
443 fmode_t flags, void *holder);
444 int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
445 struct btrfs_fs_devices **fs_devices_ret);
446 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
447 void btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices, int step);
448 int btrfs_find_device_missing_or_by_path(struct btrfs_root *root,
449 char *device_path,
450 struct btrfs_device **device);
451 struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
452 const u64 *devid,
453 const u8 *uuid);
454 int btrfs_rm_device(struct btrfs_root *root, char *device_path);
455 void btrfs_cleanup_fs_uuids(void);
456 int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
457 int btrfs_grow_device(struct btrfs_trans_handle *trans,
458 struct btrfs_device *device, u64 new_size);
459 struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
460 u8 *uuid, u8 *fsid);
461 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
462 int btrfs_init_new_device(struct btrfs_root *root, char *path);
463 int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path,
464 struct btrfs_device *srcdev,
465 struct btrfs_device **device_out);
466 int btrfs_balance(struct btrfs_balance_control *bctl,
467 struct btrfs_ioctl_balance_args *bargs);
468 int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
469 int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
470 int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
471 int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
472 int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
473 int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info);
474 int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
475 int find_free_dev_extent_start(struct btrfs_transaction *transaction,
476 struct btrfs_device *device, u64 num_bytes,
477 u64 search_start, u64 *start, u64 *max_avail);
478 int find_free_dev_extent(struct btrfs_trans_handle *trans,
479 struct btrfs_device *device, u64 num_bytes,
480 u64 *start, u64 *max_avail);
481 void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
482 int btrfs_get_dev_stats(struct btrfs_root *root,
483 struct btrfs_ioctl_get_dev_stats *stats);
484 void btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
485 int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
486 int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
487 struct btrfs_fs_info *fs_info);
488 void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_fs_info *fs_info,
489 struct btrfs_device *srcdev);
490 void btrfs_rm_dev_replace_free_srcdev(struct btrfs_fs_info *fs_info,
491 struct btrfs_device *srcdev);
492 void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
493 struct btrfs_device *tgtdev);
494 void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
495 struct btrfs_device *tgtdev);
496 void btrfs_scratch_superblocks(struct block_device *bdev, char *device_path);
497 int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree,
498 u64 logical, u64 len, int mirror_num);
499 unsigned long btrfs_full_stripe_len(struct btrfs_root *root,
500 struct btrfs_mapping_tree *map_tree,
501 u64 logical);
502 int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
503 struct btrfs_root *extent_root,
504 u64 chunk_offset, u64 chunk_size);
505 int btrfs_remove_chunk(struct btrfs_trans_handle *trans,
506 struct btrfs_root *root, u64 chunk_offset);
508 static inline int btrfs_dev_stats_dirty(struct btrfs_device *dev)
510 return atomic_read(&dev->dev_stats_ccnt);
513 static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
514 int index)
516 atomic_inc(dev->dev_stat_values + index);
517 smp_mb__before_atomic();
518 atomic_inc(&dev->dev_stats_ccnt);
521 static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
522 int index)
524 return atomic_read(dev->dev_stat_values + index);
527 static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
528 int index)
530 int ret;
532 ret = atomic_xchg(dev->dev_stat_values + index, 0);
533 smp_mb__before_atomic();
534 atomic_inc(&dev->dev_stats_ccnt);
535 return ret;
538 static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
539 int index, unsigned long val)
541 atomic_set(dev->dev_stat_values + index, val);
542 smp_mb__before_atomic();
543 atomic_inc(&dev->dev_stats_ccnt);
546 static inline void btrfs_dev_stat_reset(struct btrfs_device *dev,
547 int index)
549 btrfs_dev_stat_set(dev, index, 0);
552 void btrfs_update_commit_device_size(struct btrfs_fs_info *fs_info);
553 void btrfs_update_commit_device_bytes_used(struct btrfs_root *root,
554 struct btrfs_transaction *transaction);
556 static inline void lock_chunks(struct btrfs_root *root)
558 mutex_lock(&root->fs_info->chunk_mutex);
561 static inline void unlock_chunks(struct btrfs_root *root)
563 mutex_unlock(&root->fs_info->chunk_mutex);
566 struct list_head *btrfs_get_fs_uuids(void);
567 void btrfs_set_fs_info_ptr(struct btrfs_fs_info *fs_info);
568 void btrfs_reset_fs_info_ptr(struct btrfs_fs_info *fs_info);
569 void btrfs_close_one_device(struct btrfs_device *device);
571 #endif