1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (C) 2007 Oracle. All rights reserved.
6 #ifndef BTRFS_VOLUMES_H
7 #define BTRFS_VOLUMES_H
10 #include <linux/sort.h>
11 #include <linux/btrfs.h>
12 #include "async-thread.h"
14 #define BTRFS_MAX_DATA_CHUNK_SIZE (10ULL * SZ_1G)
16 extern struct mutex uuid_mutex;
18 #define BTRFS_STRIPE_LEN SZ_64K
21 struct btrfs_pending_bios {
26 struct btrfs_io_geometry {
27 /* remaining bytes before crossing a stripe */
29 /* offset of logical address in chunk */
31 /* length of single IO stripe */
33 /* number of stripe where address falls */
35 /* offset of address in stripe */
37 /* offset of raid56 stripe into the chunk */
38 u64 raid56_stripe_offset;
42 * Use sequence counter to get consistent device stat data on
45 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
46 #include <linux/seqlock.h>
47 #define __BTRFS_NEED_DEVICE_DATA_ORDERED
48 #define btrfs_device_data_ordered_init(device) \
49 seqcount_init(&device->data_seqcount)
51 #define btrfs_device_data_ordered_init(device) do { } while (0)
54 #define BTRFS_DEV_STATE_WRITEABLE (0)
55 #define BTRFS_DEV_STATE_IN_FS_METADATA (1)
56 #define BTRFS_DEV_STATE_MISSING (2)
57 #define BTRFS_DEV_STATE_REPLACE_TGT (3)
58 #define BTRFS_DEV_STATE_FLUSH_SENT (4)
61 struct list_head dev_list; /* device_list_mutex */
62 struct list_head dev_alloc_list; /* chunk mutex */
63 struct list_head post_commit_list; /* chunk mutex */
64 struct btrfs_fs_devices *fs_devices;
65 struct btrfs_fs_info *fs_info;
67 struct rcu_string *name;
71 spinlock_t io_lock ____cacheline_aligned;
73 /* regular prio bios */
74 struct btrfs_pending_bios pending_bios;
76 struct btrfs_pending_bios pending_sync_bios;
78 struct block_device *bdev;
80 /* the mode sent to blkdev_get */
83 unsigned long dev_state;
84 blk_status_t last_flush_error;
87 #ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED
88 seqcount_t data_seqcount;
91 /* the internal btrfs device id */
94 /* size of the device in memory */
97 /* size of the device on disk */
103 /* optimal io alignment for this device */
106 /* optimal io width for this device */
108 /* type and info about this device */
111 /* minimal io size for this device */
114 /* physical drive uuid (or lvm uuid) */
115 u8 uuid[BTRFS_UUID_SIZE];
118 * size of the device on the current transaction
120 * This variant is update when committing the transaction,
121 * and protected by chunk mutex
123 u64 commit_total_bytes;
125 /* bytes used on the current transaction */
126 u64 commit_bytes_used;
128 /* for sending down flush barriers */
129 struct bio *flush_bio;
130 struct completion flush_wait;
132 /* per-device scrub information */
133 struct scrub_ctx *scrub_ctx;
135 struct btrfs_work work;
137 /* readahead state */
138 atomic_t reada_in_flight;
140 struct reada_zone *reada_curr_zone;
141 struct radix_tree_root reada_zones;
142 struct radix_tree_root reada_extents;
144 /* disk I/O failure stats. For detailed description refer to
145 * enum btrfs_dev_stat_values in ioctl.h */
148 /* Counter to record the change of device stats */
149 atomic_t dev_stats_ccnt;
150 atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
152 struct extent_io_tree alloc_state;
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 */
224 u8 metadata_uuid[BTRFS_FSID_SIZE];
226 struct list_head fs_list;
235 /* Highest generation number of seen devices */
236 u64 latest_generation;
238 struct block_device *latest_bdev;
240 /* all of the devices in the FS, protected by a mutex
241 * so we can safely walk it to write out the supers without
242 * worrying about add/remove by the multi-device code.
243 * Scrubbing super can kick off supers writing by holding
246 struct mutex device_list_mutex;
248 /* List of all devices, protected by device_list_mutex */
249 struct list_head devices;
252 * Devices which can satisfy space allocation. Protected by
255 struct list_head alloc_list;
257 struct btrfs_fs_devices *seed;
262 /* set when we find or add a device that doesn't have the
267 struct btrfs_fs_info *fs_info;
269 struct kobject fsid_kobj;
270 struct kobject *device_dir_kobj;
271 struct completion kobj_unregister;
274 #define BTRFS_BIO_INLINE_CSUM_SIZE 64
276 #define BTRFS_MAX_DEVS(info) ((BTRFS_MAX_ITEM_SIZE(info) \
277 - sizeof(struct btrfs_chunk)) \
278 / sizeof(struct btrfs_stripe) + 1)
280 #define BTRFS_MAX_DEVS_SYS_CHUNK ((BTRFS_SYSTEM_CHUNK_ARRAY_SIZE \
281 - 2 * sizeof(struct btrfs_disk_key) \
282 - 2 * sizeof(struct btrfs_chunk)) \
283 / sizeof(struct btrfs_stripe) + 1)
286 * we need the mirror number and stripe index to be passed around
287 * the call chain while we are processing end_io (especially errors).
288 * Really, what we need is a btrfs_bio structure that has this info
289 * and is properly sized with its stripe array, but we're not there
290 * quite yet. We have our own btrfs bioset, and all of the bios
291 * we allocate are actually btrfs_io_bios. We'll cram as much of
292 * struct btrfs_bio as we can into this over time.
294 struct btrfs_io_bio {
295 unsigned int mirror_num;
296 unsigned int stripe_index;
299 u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
300 struct bvec_iter iter;
302 * This member must come last, bio_alloc_bioset will allocate enough
303 * bytes for entire btrfs_io_bio but relies on bio being last.
308 static inline struct btrfs_io_bio *btrfs_io_bio(struct bio *bio)
310 return container_of(bio, struct btrfs_io_bio, bio);
313 static inline void btrfs_io_bio_free_csum(struct btrfs_io_bio *io_bio)
315 if (io_bio->csum != io_bio->csum_inline) {
321 struct btrfs_bio_stripe {
322 struct btrfs_device *dev;
324 u64 length; /* only used for discard mappings */
329 atomic_t stripes_pending;
330 struct btrfs_fs_info *fs_info;
331 u64 map_type; /* get from map_lookup->type */
332 bio_end_io_t *end_io;
333 struct bio *orig_bio;
343 * logical block numbers for the start of each stripe
344 * The last one or two are p/q. These are sorted,
345 * so raid_map[0] is the start of our full stripe
348 struct btrfs_bio_stripe stripes[];
351 struct btrfs_device_info {
352 struct btrfs_device *dev;
358 struct btrfs_raid_attr {
359 u8 sub_stripes; /* sub_stripes info for map */
360 u8 dev_stripes; /* stripes per dev */
361 u8 devs_max; /* max devs to use */
362 u8 devs_min; /* min devs needed */
363 u8 tolerated_failures; /* max tolerated fail devs */
364 u8 devs_increment; /* ndevs has to be a multiple of this */
365 u8 ncopies; /* how many copies to data has */
366 u8 nparity; /* number of stripes worth of bytes to store
367 * parity information */
368 u8 mindev_error; /* error code if min devs requisite is unmet */
369 const char raid_name[8]; /* name of the raid */
370 u64 bg_flag; /* block group flag of the raid */
373 extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES];
382 int verified_stripes; /* For mount time dev extent verification */
383 struct btrfs_bio_stripe stripes[];
386 #define map_lookup_size(n) (sizeof(struct map_lookup) + \
387 (sizeof(struct btrfs_bio_stripe) * (n)))
389 struct btrfs_balance_args;
390 struct btrfs_balance_progress;
391 struct btrfs_balance_control {
392 struct btrfs_balance_args data;
393 struct btrfs_balance_args meta;
394 struct btrfs_balance_args sys;
398 struct btrfs_balance_progress stat;
405 BTRFS_MAP_GET_READ_MIRRORS,
408 static inline enum btrfs_map_op btrfs_op(struct bio *bio)
410 switch (bio_op(bio)) {
412 return BTRFS_MAP_DISCARD;
414 return BTRFS_MAP_WRITE;
419 return BTRFS_MAP_READ;
423 void btrfs_get_bbio(struct btrfs_bio *bbio);
424 void btrfs_put_bbio(struct btrfs_bio *bbio);
425 int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
426 u64 logical, u64 *length,
427 struct btrfs_bio **bbio_ret, int mirror_num);
428 int btrfs_map_sblock(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
429 u64 logical, u64 *length,
430 struct btrfs_bio **bbio_ret);
431 int btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
432 u64 logical, u64 len, struct btrfs_io_geometry *io_geom);
433 int btrfs_rmap_block(struct btrfs_fs_info *fs_info, u64 chunk_start,
434 u64 physical, u64 **logical, int *naddrs, int *stripe_len);
435 int btrfs_read_sys_array(struct btrfs_fs_info *fs_info);
436 int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info);
437 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, u64 type);
438 void btrfs_mapping_tree_free(struct extent_map_tree *tree);
439 blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
440 int mirror_num, int async_submit);
441 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
442 fmode_t flags, void *holder);
443 struct btrfs_device *btrfs_scan_one_device(const char *path,
444 fmode_t flags, void *holder);
445 int btrfs_forget_devices(const char *path);
446 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
447 void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices, int step);
448 void btrfs_assign_next_active_device(struct btrfs_device *device,
449 struct btrfs_device *this_dev);
450 struct btrfs_device *btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info,
452 const char *devpath);
453 struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
456 void btrfs_free_device(struct btrfs_device *device);
457 int btrfs_rm_device(struct btrfs_fs_info *fs_info,
458 const char *device_path, u64 devid);
459 void __exit btrfs_cleanup_fs_uuids(void);
460 int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
461 int btrfs_grow_device(struct btrfs_trans_handle *trans,
462 struct btrfs_device *device, u64 new_size);
463 struct btrfs_device *btrfs_find_device(struct btrfs_fs_devices *fs_devices,
464 u64 devid, u8 *uuid, u8 *fsid, bool seed);
465 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
466 int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *path);
467 int btrfs_balance(struct btrfs_fs_info *fs_info,
468 struct btrfs_balance_control *bctl,
469 struct btrfs_ioctl_balance_args *bargs);
470 void btrfs_describe_block_groups(u64 flags, char *buf, u32 size_buf);
471 int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
472 int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
473 int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
474 int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
475 int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
476 int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info);
477 int btrfs_chunk_readonly(struct btrfs_fs_info *fs_info, u64 chunk_offset);
478 int find_free_dev_extent_start(struct btrfs_device *device, u64 num_bytes,
479 u64 search_start, u64 *start, u64 *max_avail);
480 int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes,
481 u64 *start, u64 *max_avail);
482 void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
483 int btrfs_get_dev_stats(struct btrfs_fs_info *fs_info,
484 struct btrfs_ioctl_get_dev_stats *stats);
485 void btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
486 int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
487 int btrfs_run_dev_stats(struct btrfs_trans_handle *trans);
488 void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_device *srcdev);
489 void btrfs_rm_dev_replace_free_srcdev(struct btrfs_device *srcdev);
490 void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device *tgtdev);
491 void btrfs_scratch_superblocks(struct block_device *bdev, const char *device_path);
492 int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info,
493 u64 logical, u64 len);
494 unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
496 int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
497 u64 chunk_offset, u64 chunk_size);
498 int btrfs_remove_chunk(struct btrfs_trans_handle *trans, u64 chunk_offset);
499 struct extent_map *btrfs_get_chunk_map(struct btrfs_fs_info *fs_info,
500 u64 logical, u64 length);
502 static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
505 atomic_inc(dev->dev_stat_values + index);
507 * This memory barrier orders stores updating statistics before stores
508 * updating dev_stats_ccnt.
510 * It pairs with smp_rmb() in btrfs_run_dev_stats().
512 smp_mb__before_atomic();
513 atomic_inc(&dev->dev_stats_ccnt);
516 static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
519 return atomic_read(dev->dev_stat_values + index);
522 static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
527 ret = atomic_xchg(dev->dev_stat_values + index, 0);
529 * atomic_xchg implies a full memory barriers as per atomic_t.txt:
530 * - RMW operations that have a return value are fully ordered;
532 * This implicit memory barriers is paired with the smp_rmb in
533 * btrfs_run_dev_stats
535 atomic_inc(&dev->dev_stats_ccnt);
539 static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
540 int index, unsigned long val)
542 atomic_set(dev->dev_stat_values + index, val);
544 * This memory barrier orders stores updating statistics before stores
545 * updating dev_stats_ccnt.
547 * It pairs with smp_rmb() in btrfs_run_dev_stats().
549 smp_mb__before_atomic();
550 atomic_inc(&dev->dev_stats_ccnt);
553 static inline void btrfs_dev_stat_reset(struct btrfs_device *dev,
556 btrfs_dev_stat_set(dev, index, 0);
560 * Convert block group flags (BTRFS_BLOCK_GROUP_*) to btrfs_raid_types, which
561 * can be used as index to access btrfs_raid_array[].
563 static inline enum btrfs_raid_types btrfs_bg_flags_to_raid_index(u64 flags)
565 if (flags & BTRFS_BLOCK_GROUP_RAID10)
566 return BTRFS_RAID_RAID10;
567 else if (flags & BTRFS_BLOCK_GROUP_RAID1)
568 return BTRFS_RAID_RAID1;
569 else if (flags & BTRFS_BLOCK_GROUP_DUP)
570 return BTRFS_RAID_DUP;
571 else if (flags & BTRFS_BLOCK_GROUP_RAID0)
572 return BTRFS_RAID_RAID0;
573 else if (flags & BTRFS_BLOCK_GROUP_RAID5)
574 return BTRFS_RAID_RAID5;
575 else if (flags & BTRFS_BLOCK_GROUP_RAID6)
576 return BTRFS_RAID_RAID6;
578 return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */
581 void btrfs_commit_device_sizes(struct btrfs_transaction *trans);
583 struct list_head *btrfs_get_fs_uuids(void);
584 void btrfs_set_fs_info_ptr(struct btrfs_fs_info *fs_info);
585 void btrfs_reset_fs_info_ptr(struct btrfs_fs_info *fs_info);
586 bool btrfs_check_rw_degradable(struct btrfs_fs_info *fs_info,
587 struct btrfs_device *failing_dev);
589 int btrfs_bg_type_to_factor(u64 flags);
590 const char *btrfs_bg_type_to_raid_name(u64 flags);
591 int btrfs_verify_dev_extents(struct btrfs_fs_info *fs_info);