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)
32 struct btrfs_pending_bios {
38 * Use sequence counter to get consistent device stat data on
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)
47 #define btrfs_device_data_ordered_init(device) do { } while (0)
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;
61 spinlock_t io_lock ____cacheline_aligned;
63 /* regular prio bios */
64 struct btrfs_pending_bios pending_bios;
66 struct btrfs_pending_bios pending_sync_bios;
68 struct block_device *bdev;
70 /* the mode sent to blkdev_get */
77 int is_tgtdev_for_dev_replace;
79 #ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED
80 seqcount_t data_seqcount;
83 /* the internal btrfs device id */
86 /* size of the device in memory */
89 /* size of the device on disk */
95 /* optimal io alignment for this device */
98 /* optimal io width for this device */
100 /* type and info about this device */
103 /* minimal io size for this device */
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 */
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;
136 struct work_struct rcu_work;
138 /* readahead state */
139 spinlock_t reada_lock;
140 atomic_t reada_in_flight;
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 */
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) \
162 btrfs_device_get_##name(const struct btrfs_device *dev) \
168 seq = read_seqcount_begin(&dev->data_seqcount); \
170 } while (read_seqcount_retry(&dev->data_seqcount, seq)); \
175 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
178 write_seqcount_begin(&dev->data_seqcount); \
180 write_seqcount_end(&dev->data_seqcount); \
183 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
184 #define BTRFS_DEVICE_GETSET_FUNCS(name) \
186 btrfs_device_get_##name(const struct btrfs_device *dev) \
197 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
204 #define BTRFS_DEVICE_GETSET_FUNCS(name) \
206 btrfs_device_get_##name(const struct btrfs_device *dev) \
212 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
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 */
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
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;
252 /* set when we find or add a device that doesn't have the
258 #define BTRFS_BIO_INLINE_CSUM_SIZE 64
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.
269 typedef void (btrfs_io_bio_end_io_t) (struct btrfs_io_bio *bio, int err);
270 struct btrfs_io_bio {
271 unsigned long mirror_num;
272 unsigned long stripe_index;
274 u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
276 btrfs_io_bio_end_io_t *end_io;
280 static inline struct btrfs_io_bio *btrfs_io_bio(struct bio *bio)
282 return container_of(bio, struct btrfs_io_bio, bio);
285 struct btrfs_bio_stripe {
286 struct btrfs_device *dev;
288 u64 length; /* only used for discard mappings */
292 typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
294 #define BTRFS_BIO_ORIG_BIO_SUBMITTED 0x1
297 atomic_t stripes_pending;
298 struct btrfs_fs_info *fs_info;
299 bio_end_io_t *end_io;
300 struct bio *orig_bio;
307 struct btrfs_bio_stripe stripes[];
310 struct btrfs_device_info {
311 struct btrfs_device *dev;
317 struct btrfs_raid_attr {
318 int sub_stripes; /* sub_stripes info for map */
319 int dev_stripes; /* stripes per dev */
320 int devs_max; /* max devs to use */
321 int devs_min; /* min devs needed */
322 int devs_increment; /* ndevs has to be a multiple of this */
323 int ncopies; /* how many copies to data has */
334 struct btrfs_bio_stripe stripes[];
337 #define map_lookup_size(n) (sizeof(struct map_lookup) + \
338 (sizeof(struct btrfs_bio_stripe) * (n)))
341 * Restriper's general type filter
343 #define BTRFS_BALANCE_DATA (1ULL << 0)
344 #define BTRFS_BALANCE_SYSTEM (1ULL << 1)
345 #define BTRFS_BALANCE_METADATA (1ULL << 2)
347 #define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA | \
348 BTRFS_BALANCE_SYSTEM | \
349 BTRFS_BALANCE_METADATA)
351 #define BTRFS_BALANCE_FORCE (1ULL << 3)
352 #define BTRFS_BALANCE_RESUME (1ULL << 4)
357 #define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0)
358 #define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1)
359 #define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2)
360 #define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3)
361 #define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4)
362 #define BTRFS_BALANCE_ARGS_LIMIT (1ULL << 5)
365 * Profile changing flags. When SOFT is set we won't relocate chunk if
366 * it already has the target profile (even though it may be
369 #define BTRFS_BALANCE_ARGS_CONVERT (1ULL << 8)
370 #define BTRFS_BALANCE_ARGS_SOFT (1ULL << 9)
372 struct btrfs_balance_args;
373 struct btrfs_balance_progress;
374 struct btrfs_balance_control {
375 struct btrfs_fs_info *fs_info;
377 struct btrfs_balance_args data;
378 struct btrfs_balance_args meta;
379 struct btrfs_balance_args sys;
383 struct btrfs_balance_progress stat;
386 int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
387 u64 end, u64 *length);
389 #define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \
390 (sizeof(struct btrfs_bio_stripe) * (n)))
392 int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
393 u64 logical, u64 *length,
394 struct btrfs_bio **bbio_ret, int mirror_num);
395 int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
396 u64 chunk_start, u64 physical, u64 devid,
397 u64 **logical, int *naddrs, int *stripe_len);
398 int btrfs_read_sys_array(struct btrfs_root *root);
399 int btrfs_read_chunk_tree(struct btrfs_root *root);
400 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
401 struct btrfs_root *extent_root, u64 type);
402 void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
403 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
404 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
405 int mirror_num, int async_submit);
406 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
407 fmode_t flags, void *holder);
408 int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
409 struct btrfs_fs_devices **fs_devices_ret);
410 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
411 void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info,
412 struct btrfs_fs_devices *fs_devices, int step);
413 int btrfs_find_device_missing_or_by_path(struct btrfs_root *root,
415 struct btrfs_device **device);
416 struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
419 int btrfs_rm_device(struct btrfs_root *root, char *device_path);
420 void btrfs_cleanup_fs_uuids(void);
421 int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
422 int btrfs_grow_device(struct btrfs_trans_handle *trans,
423 struct btrfs_device *device, u64 new_size);
424 struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
426 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
427 int btrfs_init_new_device(struct btrfs_root *root, char *path);
428 int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path,
429 struct btrfs_device *srcdev,
430 struct btrfs_device **device_out);
431 int btrfs_balance(struct btrfs_balance_control *bctl,
432 struct btrfs_ioctl_balance_args *bargs);
433 int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
434 int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
435 int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
436 int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
437 int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
438 int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info);
439 int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
440 int find_free_dev_extent(struct btrfs_trans_handle *trans,
441 struct btrfs_device *device, u64 num_bytes,
442 u64 *start, u64 *max_avail);
443 void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
444 int btrfs_get_dev_stats(struct btrfs_root *root,
445 struct btrfs_ioctl_get_dev_stats *stats);
446 void btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
447 int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
448 int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
449 struct btrfs_fs_info *fs_info);
450 void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
451 struct btrfs_device *srcdev);
452 void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
453 struct btrfs_device *tgtdev);
454 void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
455 struct btrfs_device *tgtdev);
456 int btrfs_scratch_superblock(struct btrfs_device *device);
457 int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree,
458 u64 logical, u64 len, int mirror_num);
459 unsigned long btrfs_full_stripe_len(struct btrfs_root *root,
460 struct btrfs_mapping_tree *map_tree,
462 int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
463 struct btrfs_root *extent_root,
464 u64 chunk_offset, u64 chunk_size);
466 static inline int btrfs_dev_stats_dirty(struct btrfs_device *dev)
468 return atomic_read(&dev->dev_stats_ccnt);
471 static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
474 atomic_inc(dev->dev_stat_values + index);
475 smp_mb__before_atomic();
476 atomic_inc(&dev->dev_stats_ccnt);
479 static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
482 return atomic_read(dev->dev_stat_values + index);
485 static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
490 ret = atomic_xchg(dev->dev_stat_values + index, 0);
491 smp_mb__before_atomic();
492 atomic_inc(&dev->dev_stats_ccnt);
496 static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
497 int index, unsigned long val)
499 atomic_set(dev->dev_stat_values + index, val);
500 smp_mb__before_atomic();
501 atomic_inc(&dev->dev_stats_ccnt);
504 static inline void btrfs_dev_stat_reset(struct btrfs_device *dev,
507 btrfs_dev_stat_set(dev, index, 0);
510 void btrfs_update_commit_device_size(struct btrfs_fs_info *fs_info);
511 void btrfs_update_commit_device_bytes_used(struct btrfs_root *root,
512 struct btrfs_transaction *transaction);