1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Copyright (C) 2007 Oracle.  All rights reserved.
4  */
5 
6 #ifndef BTRFS_VOLUMES_H
7 #define BTRFS_VOLUMES_H
8 
9 #include <linux/bio.h>
10 #include <linux/sort.h>
11 #include <linux/btrfs.h>
12 #include "async-thread.h"
13 
14 #define BTRFS_MAX_DATA_CHUNK_SIZE	(10ULL * SZ_1G)
15 
16 extern struct mutex uuid_mutex;
17 
18 #define BTRFS_STRIPE_LEN	SZ_64K
19 
20 /* Used by sanity check for btrfs_raid_types. */
21 #define const_ffs(n) (__builtin_ctzll(n) + 1)
22 
23 /*
24  * The conversion from BTRFS_BLOCK_GROUP_* bits to btrfs_raid_type requires
25  * RAID0 always to be the lowest profile bit.
26  * Although it's part of on-disk format and should never change, do extra
27  * compile-time sanity checks.
28  */
29 static_assert(const_ffs(BTRFS_BLOCK_GROUP_RAID0) <
30 	      const_ffs(BTRFS_BLOCK_GROUP_PROFILE_MASK & ~BTRFS_BLOCK_GROUP_RAID0));
31 static_assert(const_ilog2(BTRFS_BLOCK_GROUP_RAID0) >
32 	      ilog2(BTRFS_BLOCK_GROUP_TYPE_MASK));
33 
34 /* ilog2() can handle both constants and variables */
35 #define BTRFS_BG_FLAG_TO_INDEX(profile)					\
36 	ilog2((profile) >> (ilog2(BTRFS_BLOCK_GROUP_RAID0) - 1))
37 
38 enum btrfs_raid_types {
39 	/* SINGLE is the special one as it doesn't have on-disk bit. */
40 	BTRFS_RAID_SINGLE  = 0,
41 
42 	BTRFS_RAID_RAID0   = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID0),
43 	BTRFS_RAID_RAID1   = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1),
44 	BTRFS_RAID_DUP	   = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_DUP),
45 	BTRFS_RAID_RAID10  = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID10),
46 	BTRFS_RAID_RAID5   = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID5),
47 	BTRFS_RAID_RAID6   = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID6),
48 	BTRFS_RAID_RAID1C3 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1C3),
49 	BTRFS_RAID_RAID1C4 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1C4),
50 
51 	BTRFS_NR_RAID_TYPES
52 };
53 
54 struct btrfs_io_geometry {
55 	/* remaining bytes before crossing a stripe */
56 	u64 len;
57 	/* offset of logical address in chunk */
58 	u64 offset;
59 	/* length of single IO stripe */
60 	u32 stripe_len;
61 	/* offset of address in stripe */
62 	u32 stripe_offset;
63 	/* number of stripe where address falls */
64 	u64 stripe_nr;
65 	/* offset of raid56 stripe into the chunk */
66 	u64 raid56_stripe_offset;
67 };
68 
69 /*
70  * Use sequence counter to get consistent device stat data on
71  * 32-bit processors.
72  */
73 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
74 #include <linux/seqlock.h>
75 #define __BTRFS_NEED_DEVICE_DATA_ORDERED
76 #define btrfs_device_data_ordered_init(device)	\
77 	seqcount_init(&device->data_seqcount)
78 #else
79 #define btrfs_device_data_ordered_init(device) do { } while (0)
80 #endif
81 
82 #define BTRFS_DEV_STATE_WRITEABLE	(0)
83 #define BTRFS_DEV_STATE_IN_FS_METADATA	(1)
84 #define BTRFS_DEV_STATE_MISSING		(2)
85 #define BTRFS_DEV_STATE_REPLACE_TGT	(3)
86 #define BTRFS_DEV_STATE_FLUSH_SENT	(4)
87 #define BTRFS_DEV_STATE_NO_READA	(5)
88 
89 struct btrfs_zoned_device_info;
90 
91 struct btrfs_device {
92 	struct list_head dev_list; /* device_list_mutex */
93 	struct list_head dev_alloc_list; /* chunk mutex */
94 	struct list_head post_commit_list; /* chunk mutex */
95 	struct btrfs_fs_devices *fs_devices;
96 	struct btrfs_fs_info *fs_info;
97 
98 	struct rcu_string __rcu *name;
99 
100 	u64 generation;
101 
102 	struct block_device *bdev;
103 
104 	struct btrfs_zoned_device_info *zone_info;
105 
106 	/* the mode sent to blkdev_get */
107 	fmode_t mode;
108 
109 	/*
110 	 * Device's major-minor number. Must be set even if the device is not
111 	 * opened (bdev == NULL), unless the device is missing.
112 	 */
113 	dev_t devt;
114 	unsigned long dev_state;
115 	blk_status_t last_flush_error;
116 
117 #ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED
118 	seqcount_t data_seqcount;
119 #endif
120 
121 	/* the internal btrfs device id */
122 	u64 devid;
123 
124 	/* size of the device in memory */
125 	u64 total_bytes;
126 
127 	/* size of the device on disk */
128 	u64 disk_total_bytes;
129 
130 	/* bytes used */
131 	u64 bytes_used;
132 
133 	/* optimal io alignment for this device */
134 	u32 io_align;
135 
136 	/* optimal io width for this device */
137 	u32 io_width;
138 	/* type and info about this device */
139 	u64 type;
140 
141 	/* minimal io size for this device */
142 	u32 sector_size;
143 
144 	/* physical drive uuid (or lvm uuid) */
145 	u8 uuid[BTRFS_UUID_SIZE];
146 
147 	/*
148 	 * size of the device on the current transaction
149 	 *
150 	 * This variant is update when committing the transaction,
151 	 * and protected by chunk mutex
152 	 */
153 	u64 commit_total_bytes;
154 
155 	/* bytes used on the current transaction */
156 	u64 commit_bytes_used;
157 
158 	/* Bio used for flushing device barriers */
159 	struct bio flush_bio;
160 	struct completion flush_wait;
161 
162 	/* per-device scrub information */
163 	struct scrub_ctx *scrub_ctx;
164 
165 	/* disk I/O failure stats. For detailed description refer to
166 	 * enum btrfs_dev_stat_values in ioctl.h */
167 	int dev_stats_valid;
168 
169 	/* Counter to record the change of device stats */
170 	atomic_t dev_stats_ccnt;
171 	atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
172 
173 	struct extent_io_tree alloc_state;
174 
175 	struct completion kobj_unregister;
176 	/* For sysfs/FSID/devinfo/devid/ */
177 	struct kobject devid_kobj;
178 
179 	/* Bandwidth limit for scrub, in bytes */
180 	u64 scrub_speed_max;
181 };
182 
183 /*
184  * If we read those variants at the context of their own lock, we needn't
185  * use the following helpers, reading them directly is safe.
186  */
187 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
188 #define BTRFS_DEVICE_GETSET_FUNCS(name)					\
189 static inline u64							\
190 btrfs_device_get_##name(const struct btrfs_device *dev)			\
191 {									\
192 	u64 size;							\
193 	unsigned int seq;						\
194 									\
195 	do {								\
196 		seq = read_seqcount_begin(&dev->data_seqcount);		\
197 		size = dev->name;					\
198 	} while (read_seqcount_retry(&dev->data_seqcount, seq));	\
199 	return size;							\
200 }									\
201 									\
202 static inline void							\
203 btrfs_device_set_##name(struct btrfs_device *dev, u64 size)		\
204 {									\
205 	preempt_disable();						\
206 	write_seqcount_begin(&dev->data_seqcount);			\
207 	dev->name = size;						\
208 	write_seqcount_end(&dev->data_seqcount);			\
209 	preempt_enable();						\
210 }
211 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
212 #define BTRFS_DEVICE_GETSET_FUNCS(name)					\
213 static inline u64							\
214 btrfs_device_get_##name(const struct btrfs_device *dev)			\
215 {									\
216 	u64 size;							\
217 									\
218 	preempt_disable();						\
219 	size = dev->name;						\
220 	preempt_enable();						\
221 	return size;							\
222 }									\
223 									\
224 static inline void							\
225 btrfs_device_set_##name(struct btrfs_device *dev, u64 size)		\
226 {									\
227 	preempt_disable();						\
228 	dev->name = size;						\
229 	preempt_enable();						\
230 }
231 #else
232 #define BTRFS_DEVICE_GETSET_FUNCS(name)					\
233 static inline u64							\
234 btrfs_device_get_##name(const struct btrfs_device *dev)			\
235 {									\
236 	return dev->name;						\
237 }									\
238 									\
239 static inline void							\
240 btrfs_device_set_##name(struct btrfs_device *dev, u64 size)		\
241 {									\
242 	dev->name = size;						\
243 }
244 #endif
245 
246 BTRFS_DEVICE_GETSET_FUNCS(total_bytes);
247 BTRFS_DEVICE_GETSET_FUNCS(disk_total_bytes);
248 BTRFS_DEVICE_GETSET_FUNCS(bytes_used);
249 
250 enum btrfs_chunk_allocation_policy {
251 	BTRFS_CHUNK_ALLOC_REGULAR,
252 	BTRFS_CHUNK_ALLOC_ZONED,
253 };
254 
255 /*
256  * Read policies for mirrored block group profiles, read picks the stripe based
257  * on these policies.
258  */
259 enum btrfs_read_policy {
260 	/* Use process PID to choose the stripe */
261 	BTRFS_READ_POLICY_PID,
262 	BTRFS_NR_READ_POLICY,
263 };
264 
265 struct btrfs_fs_devices {
266 	u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
267 	u8 metadata_uuid[BTRFS_FSID_SIZE];
268 	bool fsid_change;
269 	struct list_head fs_list;
270 
271 	/*
272 	 * Number of devices under this fsid including missing and
273 	 * replace-target device and excludes seed devices.
274 	 */
275 	u64 num_devices;
276 
277 	/*
278 	 * The number of devices that successfully opened, including
279 	 * replace-target, excludes seed devices.
280 	 */
281 	u64 open_devices;
282 
283 	/* The number of devices that are under the chunk allocation list. */
284 	u64 rw_devices;
285 
286 	/* Count of missing devices under this fsid excluding seed device. */
287 	u64 missing_devices;
288 	u64 total_rw_bytes;
289 
290 	/*
291 	 * Count of devices from btrfs_super_block::num_devices for this fsid,
292 	 * which includes the seed device, excludes the transient replace-target
293 	 * device.
294 	 */
295 	u64 total_devices;
296 
297 	/* Highest generation number of seen devices */
298 	u64 latest_generation;
299 
300 	/*
301 	 * The mount device or a device with highest generation after removal
302 	 * or replace.
303 	 */
304 	struct btrfs_device *latest_dev;
305 
306 	/* all of the devices in the FS, protected by a mutex
307 	 * so we can safely walk it to write out the supers without
308 	 * worrying about add/remove by the multi-device code.
309 	 * Scrubbing super can kick off supers writing by holding
310 	 * this mutex lock.
311 	 */
312 	struct mutex device_list_mutex;
313 
314 	/* List of all devices, protected by device_list_mutex */
315 	struct list_head devices;
316 
317 	/*
318 	 * Devices which can satisfy space allocation. Protected by
319 	 * chunk_mutex
320 	 */
321 	struct list_head alloc_list;
322 
323 	struct list_head seed_list;
324 	bool seeding;
325 
326 	int opened;
327 
328 	/* set when we find or add a device that doesn't have the
329 	 * nonrot flag set
330 	 */
331 	bool rotating;
332 
333 	struct btrfs_fs_info *fs_info;
334 	/* sysfs kobjects */
335 	struct kobject fsid_kobj;
336 	struct kobject *devices_kobj;
337 	struct kobject *devinfo_kobj;
338 	struct completion kobj_unregister;
339 
340 	enum btrfs_chunk_allocation_policy chunk_alloc_policy;
341 
342 	/* Policy used to read the mirrored stripes */
343 	enum btrfs_read_policy read_policy;
344 };
345 
346 #define BTRFS_BIO_INLINE_CSUM_SIZE	64
347 
348 #define BTRFS_MAX_DEVS(info) ((BTRFS_MAX_ITEM_SIZE(info)	\
349 			- sizeof(struct btrfs_chunk))		\
350 			/ sizeof(struct btrfs_stripe) + 1)
351 
352 #define BTRFS_MAX_DEVS_SYS_CHUNK ((BTRFS_SYSTEM_CHUNK_ARRAY_SIZE	\
353 				- 2 * sizeof(struct btrfs_disk_key)	\
354 				- 2 * sizeof(struct btrfs_chunk))	\
355 				/ sizeof(struct btrfs_stripe) + 1)
356 
357 /*
358  * Additional info to pass along bio.
359  *
360  * Mostly for btrfs specific features like csum and mirror_num.
361  */
362 struct btrfs_bio {
363 	unsigned int mirror_num;
364 
365 	/* for direct I/O */
366 	u64 file_offset;
367 
368 	/* @device is for stripe IO submission. */
369 	struct btrfs_device *device;
370 	u8 *csum;
371 	u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
372 	struct bvec_iter iter;
373 
374 	/*
375 	 * This member must come last, bio_alloc_bioset will allocate enough
376 	 * bytes for entire btrfs_bio but relies on bio being last.
377 	 */
378 	struct bio bio;
379 };
380 
btrfs_bio(struct bio * bio)381 static inline struct btrfs_bio *btrfs_bio(struct bio *bio)
382 {
383 	return container_of(bio, struct btrfs_bio, bio);
384 }
385 
btrfs_bio_free_csum(struct btrfs_bio * bbio)386 static inline void btrfs_bio_free_csum(struct btrfs_bio *bbio)
387 {
388 	if (bbio->csum != bbio->csum_inline) {
389 		kfree(bbio->csum);
390 		bbio->csum = NULL;
391 	}
392 }
393 
394 struct btrfs_io_stripe {
395 	struct btrfs_device *dev;
396 	u64 physical;
397 	u64 length; /* only used for discard mappings */
398 };
399 
400 /*
401  * Context for IO subsmission for device stripe.
402  *
403  * - Track the unfinished mirrors for mirror based profiles
404  *   Mirror based profiles are SINGLE/DUP/RAID1/RAID10.
405  *
406  * - Contain the logical -> physical mapping info
407  *   Used by submit_stripe_bio() for mapping logical bio
408  *   into physical device address.
409  *
410  * - Contain device replace info
411  *   Used by handle_ops_on_dev_replace() to copy logical bios
412  *   into the new device.
413  *
414  * - Contain RAID56 full stripe logical bytenrs
415  */
416 struct btrfs_io_context {
417 	refcount_t refs;
418 	atomic_t stripes_pending;
419 	struct btrfs_fs_info *fs_info;
420 	u64 map_type; /* get from map_lookup->type */
421 	bio_end_io_t *end_io;
422 	struct bio *orig_bio;
423 	void *private;
424 	atomic_t error;
425 	int max_errors;
426 	int num_stripes;
427 	int mirror_num;
428 	int num_tgtdevs;
429 	int *tgtdev_map;
430 	/*
431 	 * logical block numbers for the start of each stripe
432 	 * The last one or two are p/q.  These are sorted,
433 	 * so raid_map[0] is the start of our full stripe
434 	 */
435 	u64 *raid_map;
436 	struct btrfs_io_stripe stripes[];
437 };
438 
439 struct btrfs_device_info {
440 	struct btrfs_device *dev;
441 	u64 dev_offset;
442 	u64 max_avail;
443 	u64 total_avail;
444 };
445 
446 struct btrfs_raid_attr {
447 	u8 sub_stripes;		/* sub_stripes info for map */
448 	u8 dev_stripes;		/* stripes per dev */
449 	u8 devs_max;		/* max devs to use */
450 	u8 devs_min;		/* min devs needed */
451 	u8 tolerated_failures;	/* max tolerated fail devs */
452 	u8 devs_increment;	/* ndevs has to be a multiple of this */
453 	u8 ncopies;		/* how many copies to data has */
454 	u8 nparity;		/* number of stripes worth of bytes to store
455 				 * parity information */
456 	u8 mindev_error;	/* error code if min devs requisite is unmet */
457 	const char raid_name[8]; /* name of the raid */
458 	u64 bg_flag;		/* block group flag of the raid */
459 };
460 
461 extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES];
462 
463 struct map_lookup {
464 	u64 type;
465 	int io_align;
466 	int io_width;
467 	u32 stripe_len;
468 	int num_stripes;
469 	int sub_stripes;
470 	int verified_stripes; /* For mount time dev extent verification */
471 	struct btrfs_io_stripe stripes[];
472 };
473 
474 #define map_lookup_size(n) (sizeof(struct map_lookup) + \
475 			    (sizeof(struct btrfs_io_stripe) * (n)))
476 
477 struct btrfs_balance_args;
478 struct btrfs_balance_progress;
479 struct btrfs_balance_control {
480 	struct btrfs_balance_args data;
481 	struct btrfs_balance_args meta;
482 	struct btrfs_balance_args sys;
483 
484 	u64 flags;
485 
486 	struct btrfs_balance_progress stat;
487 };
488 
489 /*
490  * Search for a given device by the set parameters
491  */
492 struct btrfs_dev_lookup_args {
493 	u64 devid;
494 	u8 *uuid;
495 	u8 *fsid;
496 	bool missing;
497 };
498 
499 /* We have to initialize to -1 because BTRFS_DEV_REPLACE_DEVID is 0 */
500 #define BTRFS_DEV_LOOKUP_ARGS_INIT { .devid = (u64)-1 }
501 
502 #define BTRFS_DEV_LOOKUP_ARGS(name) \
503 	struct btrfs_dev_lookup_args name = BTRFS_DEV_LOOKUP_ARGS_INIT
504 
505 enum btrfs_map_op {
506 	BTRFS_MAP_READ,
507 	BTRFS_MAP_WRITE,
508 	BTRFS_MAP_DISCARD,
509 	BTRFS_MAP_GET_READ_MIRRORS,
510 };
511 
btrfs_op(struct bio * bio)512 static inline enum btrfs_map_op btrfs_op(struct bio *bio)
513 {
514 	switch (bio_op(bio)) {
515 	case REQ_OP_DISCARD:
516 		return BTRFS_MAP_DISCARD;
517 	case REQ_OP_WRITE:
518 	case REQ_OP_ZONE_APPEND:
519 		return BTRFS_MAP_WRITE;
520 	default:
521 		WARN_ON_ONCE(1);
522 		fallthrough;
523 	case REQ_OP_READ:
524 		return BTRFS_MAP_READ;
525 	}
526 }
527 
528 void btrfs_get_bioc(struct btrfs_io_context *bioc);
529 void btrfs_put_bioc(struct btrfs_io_context *bioc);
530 int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
531 		    u64 logical, u64 *length,
532 		    struct btrfs_io_context **bioc_ret, int mirror_num);
533 int btrfs_map_sblock(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
534 		     u64 logical, u64 *length,
535 		     struct btrfs_io_context **bioc_ret);
536 int btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, struct extent_map *map,
537 			  enum btrfs_map_op op, u64 logical,
538 			  struct btrfs_io_geometry *io_geom);
539 int btrfs_read_sys_array(struct btrfs_fs_info *fs_info);
540 int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info);
541 struct btrfs_block_group *btrfs_create_chunk(struct btrfs_trans_handle *trans,
542 					    u64 type);
543 void btrfs_mapping_tree_free(struct extent_map_tree *tree);
544 blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
545 			   int mirror_num);
546 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
547 		       fmode_t flags, void *holder);
548 struct btrfs_device *btrfs_scan_one_device(const char *path,
549 					   fmode_t flags, void *holder);
550 int btrfs_forget_devices(dev_t devt);
551 void btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
552 void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices);
553 void btrfs_assign_next_active_device(struct btrfs_device *device,
554 				     struct btrfs_device *this_dev);
555 struct btrfs_device *btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info,
556 						  u64 devid,
557 						  const char *devpath);
558 int btrfs_get_dev_args_from_path(struct btrfs_fs_info *fs_info,
559 				 struct btrfs_dev_lookup_args *args,
560 				 const char *path);
561 struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
562 					const u64 *devid,
563 					const u8 *uuid);
564 void btrfs_put_dev_args_from_path(struct btrfs_dev_lookup_args *args);
565 void btrfs_free_device(struct btrfs_device *device);
566 int btrfs_rm_device(struct btrfs_fs_info *fs_info,
567 		    struct btrfs_dev_lookup_args *args,
568 		    struct block_device **bdev, fmode_t *mode);
569 void __exit btrfs_cleanup_fs_uuids(void);
570 int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
571 int btrfs_grow_device(struct btrfs_trans_handle *trans,
572 		      struct btrfs_device *device, u64 new_size);
573 struct btrfs_device *btrfs_find_device(const struct btrfs_fs_devices *fs_devices,
574 				       const struct btrfs_dev_lookup_args *args);
575 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
576 int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *path);
577 int btrfs_balance(struct btrfs_fs_info *fs_info,
578 		  struct btrfs_balance_control *bctl,
579 		  struct btrfs_ioctl_balance_args *bargs);
580 void btrfs_describe_block_groups(u64 flags, char *buf, u32 size_buf);
581 int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
582 int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
583 int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
584 int btrfs_relocate_chunk(struct btrfs_fs_info *fs_info, u64 chunk_offset);
585 int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
586 int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
587 int btrfs_uuid_scan_kthread(void *data);
588 bool btrfs_chunk_writeable(struct btrfs_fs_info *fs_info, u64 chunk_offset);
589 int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes,
590 			 u64 *start, u64 *max_avail);
591 void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
592 int btrfs_get_dev_stats(struct btrfs_fs_info *fs_info,
593 			struct btrfs_ioctl_get_dev_stats *stats);
594 void btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
595 int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
596 int btrfs_run_dev_stats(struct btrfs_trans_handle *trans);
597 void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_device *srcdev);
598 void btrfs_rm_dev_replace_free_srcdev(struct btrfs_device *srcdev);
599 void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device *tgtdev);
600 int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info,
601 			   u64 logical, u64 len);
602 unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
603 				    u64 logical);
604 int btrfs_chunk_alloc_add_chunk_item(struct btrfs_trans_handle *trans,
605 				     struct btrfs_block_group *bg);
606 int btrfs_remove_chunk(struct btrfs_trans_handle *trans, u64 chunk_offset);
607 struct extent_map *btrfs_get_chunk_map(struct btrfs_fs_info *fs_info,
608 				       u64 logical, u64 length);
609 void btrfs_release_disk_super(struct btrfs_super_block *super);
610 
btrfs_dev_stat_inc(struct btrfs_device * dev,int index)611 static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
612 				      int index)
613 {
614 	atomic_inc(dev->dev_stat_values + index);
615 	/*
616 	 * This memory barrier orders stores updating statistics before stores
617 	 * updating dev_stats_ccnt.
618 	 *
619 	 * It pairs with smp_rmb() in btrfs_run_dev_stats().
620 	 */
621 	smp_mb__before_atomic();
622 	atomic_inc(&dev->dev_stats_ccnt);
623 }
624 
btrfs_dev_stat_read(struct btrfs_device * dev,int index)625 static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
626 				      int index)
627 {
628 	return atomic_read(dev->dev_stat_values + index);
629 }
630 
btrfs_dev_stat_read_and_reset(struct btrfs_device * dev,int index)631 static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
632 						int index)
633 {
634 	int ret;
635 
636 	ret = atomic_xchg(dev->dev_stat_values + index, 0);
637 	/*
638 	 * atomic_xchg implies a full memory barriers as per atomic_t.txt:
639 	 * - RMW operations that have a return value are fully ordered;
640 	 *
641 	 * This implicit memory barriers is paired with the smp_rmb in
642 	 * btrfs_run_dev_stats
643 	 */
644 	atomic_inc(&dev->dev_stats_ccnt);
645 	return ret;
646 }
647 
btrfs_dev_stat_set(struct btrfs_device * dev,int index,unsigned long val)648 static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
649 				      int index, unsigned long val)
650 {
651 	atomic_set(dev->dev_stat_values + index, val);
652 	/*
653 	 * This memory barrier orders stores updating statistics before stores
654 	 * updating dev_stats_ccnt.
655 	 *
656 	 * It pairs with smp_rmb() in btrfs_run_dev_stats().
657 	 */
658 	smp_mb__before_atomic();
659 	atomic_inc(&dev->dev_stats_ccnt);
660 }
661 
662 void btrfs_commit_device_sizes(struct btrfs_transaction *trans);
663 
664 struct list_head * __attribute_const__ btrfs_get_fs_uuids(void);
665 bool btrfs_check_rw_degradable(struct btrfs_fs_info *fs_info,
666 					struct btrfs_device *failing_dev);
667 void btrfs_scratch_superblocks(struct btrfs_fs_info *fs_info,
668 			       struct block_device *bdev,
669 			       const char *device_path);
670 
671 enum btrfs_raid_types __attribute_const__ btrfs_bg_flags_to_raid_index(u64 flags);
672 int btrfs_bg_type_to_factor(u64 flags);
673 const char *btrfs_bg_type_to_raid_name(u64 flags);
674 int btrfs_verify_dev_extents(struct btrfs_fs_info *fs_info);
675 bool btrfs_repair_one_zone(struct btrfs_fs_info *fs_info, u64 logical);
676 
677 #endif
678