xref: /linux/fs/bcachefs/bcachefs.h (revision 1e525507)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _BCACHEFS_H
3 #define _BCACHEFS_H
4 
5 /*
6  * SOME HIGH LEVEL CODE DOCUMENTATION:
7  *
8  * Bcache mostly works with cache sets, cache devices, and backing devices.
9  *
10  * Support for multiple cache devices hasn't quite been finished off yet, but
11  * it's about 95% plumbed through. A cache set and its cache devices is sort of
12  * like a md raid array and its component devices. Most of the code doesn't care
13  * about individual cache devices, the main abstraction is the cache set.
14  *
15  * Multiple cache devices is intended to give us the ability to mirror dirty
16  * cached data and metadata, without mirroring clean cached data.
17  *
18  * Backing devices are different, in that they have a lifetime independent of a
19  * cache set. When you register a newly formatted backing device it'll come up
20  * in passthrough mode, and then you can attach and detach a backing device from
21  * a cache set at runtime - while it's mounted and in use. Detaching implicitly
22  * invalidates any cached data for that backing device.
23  *
24  * A cache set can have multiple (many) backing devices attached to it.
25  *
26  * There's also flash only volumes - this is the reason for the distinction
27  * between struct cached_dev and struct bcache_device. A flash only volume
28  * works much like a bcache device that has a backing device, except the
29  * "cached" data is always dirty. The end result is that we get thin
30  * provisioning with very little additional code.
31  *
32  * Flash only volumes work but they're not production ready because the moving
33  * garbage collector needs more work. More on that later.
34  *
35  * BUCKETS/ALLOCATION:
36  *
37  * Bcache is primarily designed for caching, which means that in normal
38  * operation all of our available space will be allocated. Thus, we need an
39  * efficient way of deleting things from the cache so we can write new things to
40  * it.
41  *
42  * To do this, we first divide the cache device up into buckets. A bucket is the
43  * unit of allocation; they're typically around 1 mb - anywhere from 128k to 2M+
44  * works efficiently.
45  *
46  * Each bucket has a 16 bit priority, and an 8 bit generation associated with
47  * it. The gens and priorities for all the buckets are stored contiguously and
48  * packed on disk (in a linked list of buckets - aside from the superblock, all
49  * of bcache's metadata is stored in buckets).
50  *
51  * The priority is used to implement an LRU. We reset a bucket's priority when
52  * we allocate it or on cache it, and every so often we decrement the priority
53  * of each bucket. It could be used to implement something more sophisticated,
54  * if anyone ever gets around to it.
55  *
56  * The generation is used for invalidating buckets. Each pointer also has an 8
57  * bit generation embedded in it; for a pointer to be considered valid, its gen
58  * must match the gen of the bucket it points into.  Thus, to reuse a bucket all
59  * we have to do is increment its gen (and write its new gen to disk; we batch
60  * this up).
61  *
62  * Bcache is entirely COW - we never write twice to a bucket, even buckets that
63  * contain metadata (including btree nodes).
64  *
65  * THE BTREE:
66  *
67  * Bcache is in large part design around the btree.
68  *
69  * At a high level, the btree is just an index of key -> ptr tuples.
70  *
71  * Keys represent extents, and thus have a size field. Keys also have a variable
72  * number of pointers attached to them (potentially zero, which is handy for
73  * invalidating the cache).
74  *
75  * The key itself is an inode:offset pair. The inode number corresponds to a
76  * backing device or a flash only volume. The offset is the ending offset of the
77  * extent within the inode - not the starting offset; this makes lookups
78  * slightly more convenient.
79  *
80  * Pointers contain the cache device id, the offset on that device, and an 8 bit
81  * generation number. More on the gen later.
82  *
83  * Index lookups are not fully abstracted - cache lookups in particular are
84  * still somewhat mixed in with the btree code, but things are headed in that
85  * direction.
86  *
87  * Updates are fairly well abstracted, though. There are two different ways of
88  * updating the btree; insert and replace.
89  *
90  * BTREE_INSERT will just take a list of keys and insert them into the btree -
91  * overwriting (possibly only partially) any extents they overlap with. This is
92  * used to update the index after a write.
93  *
94  * BTREE_REPLACE is really cmpxchg(); it inserts a key into the btree iff it is
95  * overwriting a key that matches another given key. This is used for inserting
96  * data into the cache after a cache miss, and for background writeback, and for
97  * the moving garbage collector.
98  *
99  * There is no "delete" operation; deleting things from the index is
100  * accomplished by either by invalidating pointers (by incrementing a bucket's
101  * gen) or by inserting a key with 0 pointers - which will overwrite anything
102  * previously present at that location in the index.
103  *
104  * This means that there are always stale/invalid keys in the btree. They're
105  * filtered out by the code that iterates through a btree node, and removed when
106  * a btree node is rewritten.
107  *
108  * BTREE NODES:
109  *
110  * Our unit of allocation is a bucket, and we can't arbitrarily allocate and
111  * free smaller than a bucket - so, that's how big our btree nodes are.
112  *
113  * (If buckets are really big we'll only use part of the bucket for a btree node
114  * - no less than 1/4th - but a bucket still contains no more than a single
115  * btree node. I'd actually like to change this, but for now we rely on the
116  * bucket's gen for deleting btree nodes when we rewrite/split a node.)
117  *
118  * Anyways, btree nodes are big - big enough to be inefficient with a textbook
119  * btree implementation.
120  *
121  * The way this is solved is that btree nodes are internally log structured; we
122  * can append new keys to an existing btree node without rewriting it. This
123  * means each set of keys we write is sorted, but the node is not.
124  *
125  * We maintain this log structure in memory - keeping 1Mb of keys sorted would
126  * be expensive, and we have to distinguish between the keys we have written and
127  * the keys we haven't. So to do a lookup in a btree node, we have to search
128  * each sorted set. But we do merge written sets together lazily, so the cost of
129  * these extra searches is quite low (normally most of the keys in a btree node
130  * will be in one big set, and then there'll be one or two sets that are much
131  * smaller).
132  *
133  * This log structure makes bcache's btree more of a hybrid between a
134  * conventional btree and a compacting data structure, with some of the
135  * advantages of both.
136  *
137  * GARBAGE COLLECTION:
138  *
139  * We can't just invalidate any bucket - it might contain dirty data or
140  * metadata. If it once contained dirty data, other writes might overwrite it
141  * later, leaving no valid pointers into that bucket in the index.
142  *
143  * Thus, the primary purpose of garbage collection is to find buckets to reuse.
144  * It also counts how much valid data it each bucket currently contains, so that
145  * allocation can reuse buckets sooner when they've been mostly overwritten.
146  *
147  * It also does some things that are really internal to the btree
148  * implementation. If a btree node contains pointers that are stale by more than
149  * some threshold, it rewrites the btree node to avoid the bucket's generation
150  * wrapping around. It also merges adjacent btree nodes if they're empty enough.
151  *
152  * THE JOURNAL:
153  *
154  * Bcache's journal is not necessary for consistency; we always strictly
155  * order metadata writes so that the btree and everything else is consistent on
156  * disk in the event of an unclean shutdown, and in fact bcache had writeback
157  * caching (with recovery from unclean shutdown) before journalling was
158  * implemented.
159  *
160  * Rather, the journal is purely a performance optimization; we can't complete a
161  * write until we've updated the index on disk, otherwise the cache would be
162  * inconsistent in the event of an unclean shutdown. This means that without the
163  * journal, on random write workloads we constantly have to update all the leaf
164  * nodes in the btree, and those writes will be mostly empty (appending at most
165  * a few keys each) - highly inefficient in terms of amount of metadata writes,
166  * and it puts more strain on the various btree resorting/compacting code.
167  *
168  * The journal is just a log of keys we've inserted; on startup we just reinsert
169  * all the keys in the open journal entries. That means that when we're updating
170  * a node in the btree, we can wait until a 4k block of keys fills up before
171  * writing them out.
172  *
173  * For simplicity, we only journal updates to leaf nodes; updates to parent
174  * nodes are rare enough (since our leaf nodes are huge) that it wasn't worth
175  * the complexity to deal with journalling them (in particular, journal replay)
176  * - updates to non leaf nodes just happen synchronously (see btree_split()).
177  */
178 
179 #undef pr_fmt
180 #ifdef __KERNEL__
181 #define pr_fmt(fmt) "bcachefs: %s() " fmt "\n", __func__
182 #else
183 #define pr_fmt(fmt) "%s() " fmt "\n", __func__
184 #endif
185 
186 #include <linux/backing-dev-defs.h>
187 #include <linux/bug.h>
188 #include <linux/bio.h>
189 #include <linux/closure.h>
190 #include <linux/kobject.h>
191 #include <linux/list.h>
192 #include <linux/math64.h>
193 #include <linux/mutex.h>
194 #include <linux/percpu-refcount.h>
195 #include <linux/percpu-rwsem.h>
196 #include <linux/refcount.h>
197 #include <linux/rhashtable.h>
198 #include <linux/rwsem.h>
199 #include <linux/semaphore.h>
200 #include <linux/seqlock.h>
201 #include <linux/shrinker.h>
202 #include <linux/srcu.h>
203 #include <linux/types.h>
204 #include <linux/workqueue.h>
205 #include <linux/zstd.h>
206 
207 #include "bcachefs_format.h"
208 #include "errcode.h"
209 #include "fifo.h"
210 #include "nocow_locking_types.h"
211 #include "opts.h"
212 #include "recovery_passes_types.h"
213 #include "sb-errors_types.h"
214 #include "seqmutex.h"
215 #include "time_stats.h"
216 #include "util.h"
217 
218 #ifdef CONFIG_BCACHEFS_DEBUG
219 #define BCH_WRITE_REF_DEBUG
220 #endif
221 
222 #ifndef dynamic_fault
223 #define dynamic_fault(...)		0
224 #endif
225 
226 #define race_fault(...)			dynamic_fault("bcachefs:race")
227 
228 #define count_event(_c, _name)	this_cpu_inc((_c)->counters[BCH_COUNTER_##_name])
229 
230 #define trace_and_count(_c, _name, ...)					\
231 do {									\
232 	count_event(_c, _name);						\
233 	trace_##_name(__VA_ARGS__);					\
234 } while (0)
235 
236 #define bch2_fs_init_fault(name)					\
237 	dynamic_fault("bcachefs:bch_fs_init:" name)
238 #define bch2_meta_read_fault(name)					\
239 	 dynamic_fault("bcachefs:meta:read:" name)
240 #define bch2_meta_write_fault(name)					\
241 	 dynamic_fault("bcachefs:meta:write:" name)
242 
243 #ifdef __KERNEL__
244 #define BCACHEFS_LOG_PREFIX
245 #endif
246 
247 #ifdef BCACHEFS_LOG_PREFIX
248 
249 #define bch2_log_msg(_c, fmt)			"bcachefs (%s): " fmt, ((_c)->name)
250 #define bch2_fmt_dev(_ca, fmt)			"bcachefs (%s): " fmt "\n", ((_ca)->name)
251 #define bch2_fmt_dev_offset(_ca, _offset, fmt)	"bcachefs (%s sector %llu): " fmt "\n", ((_ca)->name), (_offset)
252 #define bch2_fmt_inum(_c, _inum, fmt)		"bcachefs (%s inum %llu): " fmt "\n", ((_c)->name), (_inum)
253 #define bch2_fmt_inum_offset(_c, _inum, _offset, fmt)			\
254 	 "bcachefs (%s inum %llu offset %llu): " fmt "\n", ((_c)->name), (_inum), (_offset)
255 
256 #else
257 
258 #define bch2_log_msg(_c, fmt)			fmt
259 #define bch2_fmt_dev(_ca, fmt)			"%s: " fmt "\n", ((_ca)->name)
260 #define bch2_fmt_dev_offset(_ca, _offset, fmt)	"%s sector %llu: " fmt "\n", ((_ca)->name), (_offset)
261 #define bch2_fmt_inum(_c, _inum, fmt)		"inum %llu: " fmt "\n", (_inum)
262 #define bch2_fmt_inum_offset(_c, _inum, _offset, fmt)				\
263 	 "inum %llu offset %llu: " fmt "\n", (_inum), (_offset)
264 
265 #endif
266 
267 #define bch2_fmt(_c, fmt)		bch2_log_msg(_c, fmt "\n")
268 
269 __printf(2, 3)
270 void bch2_print_opts(struct bch_opts *, const char *, ...);
271 
272 __printf(2, 3)
273 void __bch2_print(struct bch_fs *c, const char *fmt, ...);
274 
275 #define maybe_dev_to_fs(_c)	_Generic((_c),				\
276 	struct bch_dev *:	((struct bch_dev *) (_c))->fs,		\
277 	struct bch_fs *:	(_c))
278 
279 #define bch2_print(_c, ...) __bch2_print(maybe_dev_to_fs(_c), __VA_ARGS__)
280 
281 #define bch2_print_ratelimited(_c, ...)					\
282 do {									\
283 	static DEFINE_RATELIMIT_STATE(_rs,				\
284 				      DEFAULT_RATELIMIT_INTERVAL,	\
285 				      DEFAULT_RATELIMIT_BURST);		\
286 									\
287 	if (__ratelimit(&_rs))						\
288 		bch2_print(_c, __VA_ARGS__);				\
289 } while (0)
290 
291 #define bch_info(c, fmt, ...) \
292 	bch2_print(c, KERN_INFO bch2_fmt(c, fmt), ##__VA_ARGS__)
293 #define bch_notice(c, fmt, ...) \
294 	bch2_print(c, KERN_NOTICE bch2_fmt(c, fmt), ##__VA_ARGS__)
295 #define bch_warn(c, fmt, ...) \
296 	bch2_print(c, KERN_WARNING bch2_fmt(c, fmt), ##__VA_ARGS__)
297 #define bch_warn_ratelimited(c, fmt, ...) \
298 	bch2_print_ratelimited(c, KERN_WARNING bch2_fmt(c, fmt), ##__VA_ARGS__)
299 
300 #define bch_err(c, fmt, ...) \
301 	bch2_print(c, KERN_ERR bch2_fmt(c, fmt), ##__VA_ARGS__)
302 #define bch_err_dev(ca, fmt, ...) \
303 	bch2_print(c, KERN_ERR bch2_fmt_dev(ca, fmt), ##__VA_ARGS__)
304 #define bch_err_dev_offset(ca, _offset, fmt, ...) \
305 	bch2_print(c, KERN_ERR bch2_fmt_dev_offset(ca, _offset, fmt), ##__VA_ARGS__)
306 #define bch_err_inum(c, _inum, fmt, ...) \
307 	bch2_print(c, KERN_ERR bch2_fmt_inum(c, _inum, fmt), ##__VA_ARGS__)
308 #define bch_err_inum_offset(c, _inum, _offset, fmt, ...) \
309 	bch2_print(c, KERN_ERR bch2_fmt_inum_offset(c, _inum, _offset, fmt), ##__VA_ARGS__)
310 
311 #define bch_err_ratelimited(c, fmt, ...) \
312 	bch2_print_ratelimited(c, KERN_ERR bch2_fmt(c, fmt), ##__VA_ARGS__)
313 #define bch_err_dev_ratelimited(ca, fmt, ...) \
314 	bch2_print_ratelimited(ca, KERN_ERR bch2_fmt_dev(ca, fmt), ##__VA_ARGS__)
315 #define bch_err_dev_offset_ratelimited(ca, _offset, fmt, ...) \
316 	bch2_print_ratelimited(ca, KERN_ERR bch2_fmt_dev_offset(ca, _offset, fmt), ##__VA_ARGS__)
317 #define bch_err_inum_ratelimited(c, _inum, fmt, ...) \
318 	bch2_print_ratelimited(c, KERN_ERR bch2_fmt_inum(c, _inum, fmt), ##__VA_ARGS__)
319 #define bch_err_inum_offset_ratelimited(c, _inum, _offset, fmt, ...) \
320 	bch2_print_ratelimited(c, KERN_ERR bch2_fmt_inum_offset(c, _inum, _offset, fmt), ##__VA_ARGS__)
321 
322 static inline bool should_print_err(int err)
323 {
324 	return err && !bch2_err_matches(err, BCH_ERR_transaction_restart);
325 }
326 
327 #define bch_err_fn(_c, _ret)						\
328 do {									\
329 	if (should_print_err(_ret))					\
330 		bch_err(_c, "%s(): error %s", __func__, bch2_err_str(_ret));\
331 } while (0)
332 
333 #define bch_err_fn_ratelimited(_c, _ret)				\
334 do {									\
335 	if (should_print_err(_ret))					\
336 		bch_err_ratelimited(_c, "%s(): error %s", __func__, bch2_err_str(_ret));\
337 } while (0)
338 
339 #define bch_err_msg(_c, _ret, _msg, ...)				\
340 do {									\
341 	if (should_print_err(_ret))					\
342 		bch_err(_c, "%s(): error " _msg " %s", __func__,	\
343 			##__VA_ARGS__, bch2_err_str(_ret));		\
344 } while (0)
345 
346 #define bch_verbose(c, fmt, ...)					\
347 do {									\
348 	if ((c)->opts.verbose)						\
349 		bch_info(c, fmt, ##__VA_ARGS__);			\
350 } while (0)
351 
352 #define pr_verbose_init(opts, fmt, ...)					\
353 do {									\
354 	if (opt_get(opts, verbose))					\
355 		pr_info(fmt, ##__VA_ARGS__);				\
356 } while (0)
357 
358 /* Parameters that are useful for debugging, but should always be compiled in: */
359 #define BCH_DEBUG_PARAMS_ALWAYS()					\
360 	BCH_DEBUG_PARAM(key_merging_disabled,				\
361 		"Disables merging of extents")				\
362 	BCH_DEBUG_PARAM(btree_gc_always_rewrite,			\
363 		"Causes mark and sweep to compact and rewrite every "	\
364 		"btree node it traverses")				\
365 	BCH_DEBUG_PARAM(btree_gc_rewrite_disabled,			\
366 		"Disables rewriting of btree nodes during mark and sweep")\
367 	BCH_DEBUG_PARAM(btree_shrinker_disabled,			\
368 		"Disables the shrinker callback for the btree node cache")\
369 	BCH_DEBUG_PARAM(verify_btree_ondisk,				\
370 		"Reread btree nodes at various points to verify the "	\
371 		"mergesort in the read path against modifications "	\
372 		"done in memory")					\
373 	BCH_DEBUG_PARAM(verify_all_btree_replicas,			\
374 		"When reading btree nodes, read all replicas and "	\
375 		"compare them")						\
376 	BCH_DEBUG_PARAM(backpointers_no_use_write_buffer,		\
377 		"Don't use the write buffer for backpointers, enabling "\
378 		"extra runtime checks")
379 
380 /* Parameters that should only be compiled in debug mode: */
381 #define BCH_DEBUG_PARAMS_DEBUG()					\
382 	BCH_DEBUG_PARAM(expensive_debug_checks,				\
383 		"Enables various runtime debugging checks that "	\
384 		"significantly affect performance")			\
385 	BCH_DEBUG_PARAM(debug_check_iterators,				\
386 		"Enables extra verification for btree iterators")	\
387 	BCH_DEBUG_PARAM(debug_check_btree_accounting,			\
388 		"Verify btree accounting for keys within a node")	\
389 	BCH_DEBUG_PARAM(journal_seq_verify,				\
390 		"Store the journal sequence number in the version "	\
391 		"number of every btree key, and verify that btree "	\
392 		"update ordering is preserved during recovery")		\
393 	BCH_DEBUG_PARAM(inject_invalid_keys,				\
394 		"Store the journal sequence number in the version "	\
395 		"number of every btree key, and verify that btree "	\
396 		"update ordering is preserved during recovery")		\
397 	BCH_DEBUG_PARAM(test_alloc_startup,				\
398 		"Force allocator startup to use the slowpath where it"	\
399 		"can't find enough free buckets without invalidating"	\
400 		"cached data")						\
401 	BCH_DEBUG_PARAM(force_reconstruct_read,				\
402 		"Force reads to use the reconstruct path, when reading"	\
403 		"from erasure coded extents")				\
404 	BCH_DEBUG_PARAM(test_restart_gc,				\
405 		"Test restarting mark and sweep gc when bucket gens change")
406 
407 #define BCH_DEBUG_PARAMS_ALL() BCH_DEBUG_PARAMS_ALWAYS() BCH_DEBUG_PARAMS_DEBUG()
408 
409 #ifdef CONFIG_BCACHEFS_DEBUG
410 #define BCH_DEBUG_PARAMS() BCH_DEBUG_PARAMS_ALL()
411 #else
412 #define BCH_DEBUG_PARAMS() BCH_DEBUG_PARAMS_ALWAYS()
413 #endif
414 
415 #define BCH_DEBUG_PARAM(name, description) extern bool bch2_##name;
416 BCH_DEBUG_PARAMS()
417 #undef BCH_DEBUG_PARAM
418 
419 #ifndef CONFIG_BCACHEFS_DEBUG
420 #define BCH_DEBUG_PARAM(name, description) static const __maybe_unused bool bch2_##name;
421 BCH_DEBUG_PARAMS_DEBUG()
422 #undef BCH_DEBUG_PARAM
423 #endif
424 
425 #define BCH_TIME_STATS()			\
426 	x(btree_node_mem_alloc)			\
427 	x(btree_node_split)			\
428 	x(btree_node_compact)			\
429 	x(btree_node_merge)			\
430 	x(btree_node_sort)			\
431 	x(btree_node_read)			\
432 	x(btree_node_read_done)			\
433 	x(btree_interior_update_foreground)	\
434 	x(btree_interior_update_total)		\
435 	x(btree_gc)				\
436 	x(data_write)				\
437 	x(data_read)				\
438 	x(data_promote)				\
439 	x(journal_flush_write)			\
440 	x(journal_noflush_write)		\
441 	x(journal_flush_seq)			\
442 	x(blocked_journal_low_on_space)		\
443 	x(blocked_journal_low_on_pin)		\
444 	x(blocked_journal_max_in_flight)	\
445 	x(blocked_allocate)			\
446 	x(blocked_allocate_open_bucket)		\
447 	x(blocked_write_buffer_full)		\
448 	x(nocow_lock_contended)
449 
450 enum bch_time_stats {
451 #define x(name) BCH_TIME_##name,
452 	BCH_TIME_STATS()
453 #undef x
454 	BCH_TIME_STAT_NR
455 };
456 
457 #include "alloc_types.h"
458 #include "btree_types.h"
459 #include "btree_node_scan_types.h"
460 #include "btree_write_buffer_types.h"
461 #include "buckets_types.h"
462 #include "buckets_waiting_for_journal_types.h"
463 #include "clock_types.h"
464 #include "disk_groups_types.h"
465 #include "ec_types.h"
466 #include "journal_types.h"
467 #include "keylist_types.h"
468 #include "quota_types.h"
469 #include "rebalance_types.h"
470 #include "replicas_types.h"
471 #include "subvolume_types.h"
472 #include "super_types.h"
473 #include "thread_with_file_types.h"
474 
475 /* Number of nodes btree coalesce will try to coalesce at once */
476 #define GC_MERGE_NODES		4U
477 
478 /* Maximum number of nodes we might need to allocate atomically: */
479 #define BTREE_RESERVE_MAX	(BTREE_MAX_DEPTH + (BTREE_MAX_DEPTH - 1))
480 
481 /* Size of the freelist we allocate btree nodes from: */
482 #define BTREE_NODE_RESERVE	(BTREE_RESERVE_MAX * 4)
483 
484 #define BTREE_NODE_OPEN_BUCKET_RESERVE	(BTREE_RESERVE_MAX * BCH_REPLICAS_MAX)
485 
486 struct btree;
487 
488 enum gc_phase {
489 	GC_PHASE_NOT_RUNNING,
490 	GC_PHASE_START,
491 	GC_PHASE_SB,
492 
493 	GC_PHASE_BTREE_stripes,
494 	GC_PHASE_BTREE_extents,
495 	GC_PHASE_BTREE_inodes,
496 	GC_PHASE_BTREE_dirents,
497 	GC_PHASE_BTREE_xattrs,
498 	GC_PHASE_BTREE_alloc,
499 	GC_PHASE_BTREE_quotas,
500 	GC_PHASE_BTREE_reflink,
501 	GC_PHASE_BTREE_subvolumes,
502 	GC_PHASE_BTREE_snapshots,
503 	GC_PHASE_BTREE_lru,
504 	GC_PHASE_BTREE_freespace,
505 	GC_PHASE_BTREE_need_discard,
506 	GC_PHASE_BTREE_backpointers,
507 	GC_PHASE_BTREE_bucket_gens,
508 	GC_PHASE_BTREE_snapshot_trees,
509 	GC_PHASE_BTREE_deleted_inodes,
510 	GC_PHASE_BTREE_logged_ops,
511 	GC_PHASE_BTREE_rebalance_work,
512 	GC_PHASE_BTREE_subvolume_children,
513 
514 	GC_PHASE_PENDING_DELETE,
515 };
516 
517 struct gc_pos {
518 	enum gc_phase		phase;
519 	struct bpos		pos;
520 	unsigned		level;
521 };
522 
523 struct reflink_gc {
524 	u64		offset;
525 	u32		size;
526 	u32		refcount;
527 };
528 
529 typedef GENRADIX(struct reflink_gc) reflink_gc_table;
530 
531 struct io_count {
532 	u64			sectors[2][BCH_DATA_NR];
533 };
534 
535 struct bch_dev {
536 	struct kobject		kobj;
537 	struct percpu_ref	ref;
538 	struct completion	ref_completion;
539 	struct percpu_ref	io_ref;
540 	struct completion	io_ref_completion;
541 
542 	struct bch_fs		*fs;
543 
544 	u8			dev_idx;
545 	/*
546 	 * Cached version of this device's member info from superblock
547 	 * Committed by bch2_write_super() -> bch_fs_mi_update()
548 	 */
549 	struct bch_member_cpu	mi;
550 	atomic64_t		errors[BCH_MEMBER_ERROR_NR];
551 
552 	__uuid_t		uuid;
553 	char			name[BDEVNAME_SIZE];
554 
555 	struct bch_sb_handle	disk_sb;
556 	struct bch_sb		*sb_read_scratch;
557 	int			sb_write_error;
558 	dev_t			dev;
559 	atomic_t		flush_seq;
560 
561 	struct bch_devs_mask	self;
562 
563 	/* biosets used in cloned bios for writing multiple replicas */
564 	struct bio_set		replica_set;
565 
566 	/*
567 	 * Buckets:
568 	 * Per-bucket arrays are protected by c->mark_lock, bucket_lock and
569 	 * gc_lock, for device resize - holding any is sufficient for access:
570 	 * Or rcu_read_lock(), but only for ptr_stale():
571 	 */
572 	struct bucket_array __rcu *buckets_gc;
573 	struct bucket_gens __rcu *bucket_gens;
574 	u8			*oldest_gen;
575 	unsigned long		*buckets_nouse;
576 	struct rw_semaphore	bucket_lock;
577 
578 	struct bch_dev_usage		*usage_base;
579 	struct bch_dev_usage __percpu	*usage[JOURNAL_BUF_NR];
580 	struct bch_dev_usage __percpu	*usage_gc;
581 
582 	/* Allocator: */
583 	u64			new_fs_bucket_idx;
584 	u64			alloc_cursor;
585 
586 	unsigned		nr_open_buckets;
587 	unsigned		nr_btree_reserve;
588 
589 	size_t			inc_gen_needs_gc;
590 	size_t			inc_gen_really_needs_gc;
591 	size_t			buckets_waiting_on_journal;
592 
593 	atomic64_t		rebalance_work;
594 
595 	struct journal_device	journal;
596 	u64			prev_journal_sector;
597 
598 	struct work_struct	io_error_work;
599 
600 	/* The rest of this all shows up in sysfs */
601 	atomic64_t		cur_latency[2];
602 	struct bch2_time_stats_quantiles io_latency[2];
603 
604 #define CONGESTED_MAX		1024
605 	atomic_t		congested;
606 	u64			congested_last;
607 
608 	struct io_count __percpu *io_done;
609 };
610 
611 /*
612  * initial_gc_unfixed
613  * error
614  * topology error
615  */
616 
617 #define BCH_FS_FLAGS()			\
618 	x(new_fs)			\
619 	x(started)			\
620 	x(may_go_rw)			\
621 	x(rw)				\
622 	x(was_rw)			\
623 	x(stopping)			\
624 	x(emergency_ro)			\
625 	x(going_ro)			\
626 	x(write_disable_complete)	\
627 	x(clean_shutdown)		\
628 	x(fsck_running)			\
629 	x(initial_gc_unfixed)		\
630 	x(need_another_gc)		\
631 	x(need_delete_dead_snapshots)	\
632 	x(error)			\
633 	x(topology_error)		\
634 	x(errors_fixed)			\
635 	x(errors_not_fixed)
636 
637 enum bch_fs_flags {
638 #define x(n)		BCH_FS_##n,
639 	BCH_FS_FLAGS()
640 #undef x
641 };
642 
643 struct btree_debug {
644 	unsigned		id;
645 };
646 
647 #define BCH_TRANSACTIONS_NR 128
648 
649 struct btree_transaction_stats {
650 	struct bch2_time_stats	duration;
651 	struct bch2_time_stats	lock_hold_times;
652 	struct mutex		lock;
653 	unsigned		nr_max_paths;
654 	unsigned		journal_entries_size;
655 	unsigned		max_mem;
656 	char			*max_paths_text;
657 };
658 
659 struct bch_fs_pcpu {
660 	u64			sectors_available;
661 };
662 
663 struct journal_seq_blacklist_table {
664 	size_t			nr;
665 	struct journal_seq_blacklist_table_entry {
666 		u64		start;
667 		u64		end;
668 		bool		dirty;
669 	}			entries[];
670 };
671 
672 struct journal_keys {
673 	/* must match layout in darray_types.h */
674 	size_t			nr, size;
675 	struct journal_key {
676 		u64		journal_seq;
677 		u32		journal_offset;
678 		enum btree_id	btree_id:8;
679 		unsigned	level:8;
680 		bool		allocated;
681 		bool		overwritten;
682 		struct bkey_i	*k;
683 	}			*data;
684 	/*
685 	 * Gap buffer: instead of all the empty space in the array being at the
686 	 * end of the buffer - from @nr to @size - the empty space is at @gap.
687 	 * This means that sequential insertions are O(n) instead of O(n^2).
688 	 */
689 	size_t			gap;
690 	atomic_t		ref;
691 	bool			initial_ref_held;
692 };
693 
694 struct btree_trans_buf {
695 	struct btree_trans	*trans;
696 };
697 
698 #define REPLICAS_DELTA_LIST_MAX	(1U << 16)
699 
700 #define BCACHEFS_ROOT_SUBVOL_INUM					\
701 	((subvol_inum) { BCACHEFS_ROOT_SUBVOL,	BCACHEFS_ROOT_INO })
702 
703 #define BCH_WRITE_REFS()						\
704 	x(trans)							\
705 	x(write)							\
706 	x(promote)							\
707 	x(node_rewrite)							\
708 	x(stripe_create)						\
709 	x(stripe_delete)						\
710 	x(reflink)							\
711 	x(fallocate)							\
712 	x(fsync)							\
713 	x(dio_write)							\
714 	x(discard)							\
715 	x(discard_fast)							\
716 	x(invalidate)							\
717 	x(delete_dead_snapshots)					\
718 	x(snapshot_delete_pagecache)					\
719 	x(sysfs)							\
720 	x(btree_write_buffer)
721 
722 enum bch_write_ref {
723 #define x(n) BCH_WRITE_REF_##n,
724 	BCH_WRITE_REFS()
725 #undef x
726 	BCH_WRITE_REF_NR,
727 };
728 
729 struct bch_fs {
730 	struct closure		cl;
731 
732 	struct list_head	list;
733 	struct kobject		kobj;
734 	struct kobject		counters_kobj;
735 	struct kobject		internal;
736 	struct kobject		opts_dir;
737 	struct kobject		time_stats;
738 	unsigned long		flags;
739 
740 	int			minor;
741 	struct device		*chardev;
742 	struct super_block	*vfs_sb;
743 	dev_t			dev;
744 	char			name[40];
745 	struct stdio_redirect	*stdio;
746 	struct task_struct	*stdio_filter;
747 
748 	/* ro/rw, add/remove/resize devices: */
749 	struct rw_semaphore	state_lock;
750 
751 	/* Counts outstanding writes, for clean transition to read-only */
752 #ifdef BCH_WRITE_REF_DEBUG
753 	atomic_long_t		writes[BCH_WRITE_REF_NR];
754 #else
755 	struct percpu_ref	writes;
756 #endif
757 	/*
758 	 * Analagous to c->writes, for asynchronous ops that don't necessarily
759 	 * need fs to be read-write
760 	 */
761 	refcount_t		ro_ref;
762 	wait_queue_head_t	ro_ref_wait;
763 
764 	struct work_struct	read_only_work;
765 
766 	struct bch_dev __rcu	*devs[BCH_SB_MEMBERS_MAX];
767 
768 	struct bch_replicas_cpu replicas;
769 	struct bch_replicas_cpu replicas_gc;
770 	struct mutex		replicas_gc_lock;
771 	mempool_t		replicas_delta_pool;
772 
773 	struct journal_entry_res btree_root_journal_res;
774 	struct journal_entry_res replicas_journal_res;
775 	struct journal_entry_res clock_journal_res;
776 	struct journal_entry_res dev_usage_journal_res;
777 
778 	struct bch_disk_groups_cpu __rcu *disk_groups;
779 
780 	struct bch_opts		opts;
781 
782 	/* Updated by bch2_sb_update():*/
783 	struct {
784 		__uuid_t	uuid;
785 		__uuid_t	user_uuid;
786 
787 		u16		version;
788 		u16		version_min;
789 		u16		version_upgrade_complete;
790 
791 		u8		nr_devices;
792 		u8		clean;
793 
794 		u8		encryption_type;
795 
796 		u64		time_base_lo;
797 		u32		time_base_hi;
798 		unsigned	time_units_per_sec;
799 		unsigned	nsec_per_time_unit;
800 		u64		features;
801 		u64		compat;
802 		unsigned long	errors_silent[BITS_TO_LONGS(BCH_SB_ERR_MAX)];
803 		u64		btrees_lost_data;
804 	}			sb;
805 
806 
807 	struct bch_sb_handle	disk_sb;
808 
809 	unsigned short		block_bits;	/* ilog2(block_size) */
810 
811 	u16			btree_foreground_merge_threshold;
812 
813 	struct closure		sb_write;
814 	struct mutex		sb_lock;
815 
816 	/* snapshot.c: */
817 	struct snapshot_table __rcu *snapshots;
818 	struct mutex		snapshot_table_lock;
819 	struct rw_semaphore	snapshot_create_lock;
820 
821 	struct work_struct	snapshot_delete_work;
822 	struct work_struct	snapshot_wait_for_pagecache_and_delete_work;
823 	snapshot_id_list	snapshots_unlinked;
824 	struct mutex		snapshots_unlinked_lock;
825 
826 	/* BTREE CACHE */
827 	struct bio_set		btree_bio;
828 	struct workqueue_struct	*io_complete_wq;
829 
830 	struct btree_root	btree_roots_known[BTREE_ID_NR];
831 	DARRAY(struct btree_root) btree_roots_extra;
832 	struct mutex		btree_root_lock;
833 
834 	struct btree_cache	btree_cache;
835 
836 	/*
837 	 * Cache of allocated btree nodes - if we allocate a btree node and
838 	 * don't use it, if we free it that space can't be reused until going
839 	 * _all_ the way through the allocator (which exposes us to a livelock
840 	 * when allocating btree reserves fail halfway through) - instead, we
841 	 * can stick them here:
842 	 */
843 	struct btree_alloc	btree_reserve_cache[BTREE_NODE_RESERVE * 2];
844 	unsigned		btree_reserve_cache_nr;
845 	struct mutex		btree_reserve_cache_lock;
846 
847 	mempool_t		btree_interior_update_pool;
848 	struct list_head	btree_interior_update_list;
849 	struct list_head	btree_interior_updates_unwritten;
850 	struct mutex		btree_interior_update_lock;
851 	struct closure_waitlist	btree_interior_update_wait;
852 
853 	struct workqueue_struct	*btree_interior_update_worker;
854 	struct work_struct	btree_interior_update_work;
855 
856 	struct workqueue_struct	*btree_node_rewrite_worker;
857 
858 	struct list_head	pending_node_rewrites;
859 	struct mutex		pending_node_rewrites_lock;
860 
861 	/* btree_io.c: */
862 	spinlock_t		btree_write_error_lock;
863 	struct btree_write_stats {
864 		atomic64_t	nr;
865 		atomic64_t	bytes;
866 	}			btree_write_stats[BTREE_WRITE_TYPE_NR];
867 
868 	/* btree_iter.c: */
869 	struct seqmutex		btree_trans_lock;
870 	struct list_head	btree_trans_list;
871 	mempool_t		btree_trans_pool;
872 	mempool_t		btree_trans_mem_pool;
873 	struct btree_trans_buf  __percpu	*btree_trans_bufs;
874 
875 	struct srcu_struct	btree_trans_barrier;
876 	bool			btree_trans_barrier_initialized;
877 
878 	struct btree_key_cache	btree_key_cache;
879 	unsigned		btree_key_cache_btrees;
880 
881 	struct btree_write_buffer btree_write_buffer;
882 
883 	struct workqueue_struct	*btree_update_wq;
884 	struct workqueue_struct	*btree_io_complete_wq;
885 	/* copygc needs its own workqueue for index updates.. */
886 	struct workqueue_struct	*copygc_wq;
887 	/*
888 	 * Use a dedicated wq for write ref holder tasks. Required to avoid
889 	 * dependency problems with other wq tasks that can block on ref
890 	 * draining, such as read-only transition.
891 	 */
892 	struct workqueue_struct *write_ref_wq;
893 
894 	/* ALLOCATION */
895 	struct bch_devs_mask	rw_devs[BCH_DATA_NR];
896 
897 	u64			capacity; /* sectors */
898 
899 	/*
900 	 * When capacity _decreases_ (due to a disk being removed), we
901 	 * increment capacity_gen - this invalidates outstanding reservations
902 	 * and forces them to be revalidated
903 	 */
904 	u32			capacity_gen;
905 	unsigned		bucket_size_max;
906 
907 	atomic64_t		sectors_available;
908 	struct mutex		sectors_available_lock;
909 
910 	struct bch_fs_pcpu __percpu	*pcpu;
911 
912 	struct percpu_rw_semaphore	mark_lock;
913 
914 	seqcount_t			usage_lock;
915 	struct bch_fs_usage		*usage_base;
916 	struct bch_fs_usage __percpu	*usage[JOURNAL_BUF_NR];
917 	struct bch_fs_usage __percpu	*usage_gc;
918 	u64 __percpu		*online_reserved;
919 
920 	/* single element mempool: */
921 	struct mutex		usage_scratch_lock;
922 	struct bch_fs_usage_online *usage_scratch;
923 
924 	struct io_clock		io_clock[2];
925 
926 	/* JOURNAL SEQ BLACKLIST */
927 	struct journal_seq_blacklist_table *
928 				journal_seq_blacklist_table;
929 	struct work_struct	journal_seq_blacklist_gc_work;
930 
931 	/* ALLOCATOR */
932 	spinlock_t		freelist_lock;
933 	struct closure_waitlist	freelist_wait;
934 
935 	open_bucket_idx_t	open_buckets_freelist;
936 	open_bucket_idx_t	open_buckets_nr_free;
937 	struct closure_waitlist	open_buckets_wait;
938 	struct open_bucket	open_buckets[OPEN_BUCKETS_COUNT];
939 	open_bucket_idx_t	open_buckets_hash[OPEN_BUCKETS_COUNT];
940 
941 	open_bucket_idx_t	open_buckets_partial[OPEN_BUCKETS_COUNT];
942 	open_bucket_idx_t	open_buckets_partial_nr;
943 
944 	struct write_point	btree_write_point;
945 	struct write_point	rebalance_write_point;
946 
947 	struct write_point	write_points[WRITE_POINT_MAX];
948 	struct hlist_head	write_points_hash[WRITE_POINT_HASH_NR];
949 	struct mutex		write_points_hash_lock;
950 	unsigned		write_points_nr;
951 
952 	struct buckets_waiting_for_journal buckets_waiting_for_journal;
953 	struct work_struct	invalidate_work;
954 	struct work_struct	discard_work;
955 	struct mutex		discard_buckets_in_flight_lock;
956 	DARRAY(struct bpos)	discard_buckets_in_flight;
957 	struct work_struct	discard_fast_work;
958 
959 	/* GARBAGE COLLECTION */
960 	struct task_struct	*gc_thread;
961 	atomic_t		kick_gc;
962 	unsigned long		gc_count;
963 
964 	enum btree_id		gc_gens_btree;
965 	struct bpos		gc_gens_pos;
966 
967 	/*
968 	 * Tracks GC's progress - everything in the range [ZERO_KEY..gc_cur_pos]
969 	 * has been marked by GC.
970 	 *
971 	 * gc_cur_phase is a superset of btree_ids (BTREE_ID_extents etc.)
972 	 *
973 	 * Protected by gc_pos_lock. Only written to by GC thread, so GC thread
974 	 * can read without a lock.
975 	 */
976 	seqcount_t		gc_pos_lock;
977 	struct gc_pos		gc_pos;
978 
979 	/*
980 	 * The allocation code needs gc_mark in struct bucket to be correct, but
981 	 * it's not while a gc is in progress.
982 	 */
983 	struct rw_semaphore	gc_lock;
984 	struct mutex		gc_gens_lock;
985 
986 	/* IO PATH */
987 	struct semaphore	io_in_flight;
988 	struct bio_set		bio_read;
989 	struct bio_set		bio_read_split;
990 	struct bio_set		bio_write;
991 	struct mutex		bio_bounce_pages_lock;
992 	mempool_t		bio_bounce_pages;
993 	struct bucket_nocow_lock_table
994 				nocow_locks;
995 	struct rhashtable	promote_table;
996 
997 	mempool_t		compression_bounce[2];
998 	mempool_t		compress_workspace[BCH_COMPRESSION_TYPE_NR];
999 	mempool_t		decompress_workspace;
1000 	size_t			zstd_workspace_size;
1001 
1002 	struct crypto_shash	*sha256;
1003 	struct crypto_sync_skcipher *chacha20;
1004 	struct crypto_shash	*poly1305;
1005 
1006 	atomic64_t		key_version;
1007 
1008 	mempool_t		large_bkey_pool;
1009 
1010 	/* MOVE.C */
1011 	struct list_head	moving_context_list;
1012 	struct mutex		moving_context_lock;
1013 
1014 	/* REBALANCE */
1015 	struct bch_fs_rebalance	rebalance;
1016 
1017 	/* COPYGC */
1018 	struct task_struct	*copygc_thread;
1019 	struct write_point	copygc_write_point;
1020 	s64			copygc_wait_at;
1021 	s64			copygc_wait;
1022 	bool			copygc_running;
1023 	wait_queue_head_t	copygc_running_wq;
1024 
1025 	/* STRIPES: */
1026 	GENRADIX(struct stripe) stripes;
1027 	GENRADIX(struct gc_stripe) gc_stripes;
1028 
1029 	struct hlist_head	ec_stripes_new[32];
1030 	spinlock_t		ec_stripes_new_lock;
1031 
1032 	ec_stripes_heap		ec_stripes_heap;
1033 	struct mutex		ec_stripes_heap_lock;
1034 
1035 	/* ERASURE CODING */
1036 	struct list_head	ec_stripe_head_list;
1037 	struct mutex		ec_stripe_head_lock;
1038 
1039 	struct list_head	ec_stripe_new_list;
1040 	struct mutex		ec_stripe_new_lock;
1041 	wait_queue_head_t	ec_stripe_new_wait;
1042 
1043 	struct work_struct	ec_stripe_create_work;
1044 	u64			ec_stripe_hint;
1045 
1046 	struct work_struct	ec_stripe_delete_work;
1047 
1048 	struct bio_set		ec_bioset;
1049 
1050 	/* REFLINK */
1051 	reflink_gc_table	reflink_gc_table;
1052 	size_t			reflink_gc_nr;
1053 
1054 	/* fs.c */
1055 	struct list_head	vfs_inodes_list;
1056 	struct mutex		vfs_inodes_lock;
1057 
1058 	/* VFS IO PATH - fs-io.c */
1059 	struct bio_set		writepage_bioset;
1060 	struct bio_set		dio_write_bioset;
1061 	struct bio_set		dio_read_bioset;
1062 	struct bio_set		nocow_flush_bioset;
1063 
1064 	/* QUOTAS */
1065 	struct bch_memquota_type quotas[QTYP_NR];
1066 
1067 	/* RECOVERY */
1068 	u64			journal_replay_seq_start;
1069 	u64			journal_replay_seq_end;
1070 	/*
1071 	 * Two different uses:
1072 	 * "Has this fsck pass?" - i.e. should this type of error be an
1073 	 * emergency read-only
1074 	 * And, in certain situations fsck will rewind to an earlier pass: used
1075 	 * for signaling to the toplevel code which pass we want to run now.
1076 	 */
1077 	enum bch_recovery_pass	curr_recovery_pass;
1078 	/* bitmap of explicitly enabled recovery passes: */
1079 	u64			recovery_passes_explicit;
1080 	/* bitmask of recovery passes that we actually ran */
1081 	u64			recovery_passes_complete;
1082 	/* never rewinds version of curr_recovery_pass */
1083 	enum bch_recovery_pass	recovery_pass_done;
1084 	struct semaphore	online_fsck_mutex;
1085 
1086 	/* DEBUG JUNK */
1087 	struct dentry		*fs_debug_dir;
1088 	struct dentry		*btree_debug_dir;
1089 	struct btree_debug	btree_debug[BTREE_ID_NR];
1090 	struct btree		*verify_data;
1091 	struct btree_node	*verify_ondisk;
1092 	struct mutex		verify_lock;
1093 
1094 	u64			*unused_inode_hints;
1095 	unsigned		inode_shard_bits;
1096 
1097 	/*
1098 	 * A btree node on disk could have too many bsets for an iterator to fit
1099 	 * on the stack - have to dynamically allocate them
1100 	 */
1101 	mempool_t		fill_iter;
1102 
1103 	mempool_t		btree_bounce_pool;
1104 
1105 	struct journal		journal;
1106 	GENRADIX(struct journal_replay *) journal_entries;
1107 	u64			journal_entries_base_seq;
1108 	struct journal_keys	journal_keys;
1109 	struct list_head	journal_iters;
1110 
1111 	struct find_btree_nodes	found_btree_nodes;
1112 
1113 	u64			last_bucket_seq_cleanup;
1114 
1115 	u64			counters_on_mount[BCH_COUNTER_NR];
1116 	u64 __percpu		*counters;
1117 
1118 	unsigned		btree_gc_periodic:1;
1119 	unsigned		copy_gc_enabled:1;
1120 	bool			promote_whole_extents;
1121 
1122 	struct bch2_time_stats	times[BCH_TIME_STAT_NR];
1123 
1124 	struct btree_transaction_stats btree_transaction_stats[BCH_TRANSACTIONS_NR];
1125 
1126 	/* ERRORS */
1127 	struct list_head	fsck_error_msgs;
1128 	struct mutex		fsck_error_msgs_lock;
1129 	bool			fsck_alloc_msgs_err;
1130 
1131 	bch_sb_errors_cpu	fsck_error_counts;
1132 	struct mutex		fsck_error_counts_lock;
1133 };
1134 
1135 extern struct wait_queue_head bch2_read_only_wait;
1136 
1137 static inline void bch2_write_ref_get(struct bch_fs *c, enum bch_write_ref ref)
1138 {
1139 #ifdef BCH_WRITE_REF_DEBUG
1140 	atomic_long_inc(&c->writes[ref]);
1141 #else
1142 	percpu_ref_get(&c->writes);
1143 #endif
1144 }
1145 
1146 static inline bool __bch2_write_ref_tryget(struct bch_fs *c, enum bch_write_ref ref)
1147 {
1148 #ifdef BCH_WRITE_REF_DEBUG
1149 	return !test_bit(BCH_FS_going_ro, &c->flags) &&
1150 		atomic_long_inc_not_zero(&c->writes[ref]);
1151 #else
1152 	return percpu_ref_tryget(&c->writes);
1153 #endif
1154 }
1155 
1156 static inline bool bch2_write_ref_tryget(struct bch_fs *c, enum bch_write_ref ref)
1157 {
1158 #ifdef BCH_WRITE_REF_DEBUG
1159 	return !test_bit(BCH_FS_going_ro, &c->flags) &&
1160 		atomic_long_inc_not_zero(&c->writes[ref]);
1161 #else
1162 	return percpu_ref_tryget_live(&c->writes);
1163 #endif
1164 }
1165 
1166 static inline void bch2_write_ref_put(struct bch_fs *c, enum bch_write_ref ref)
1167 {
1168 #ifdef BCH_WRITE_REF_DEBUG
1169 	long v = atomic_long_dec_return(&c->writes[ref]);
1170 
1171 	BUG_ON(v < 0);
1172 	if (v)
1173 		return;
1174 	for (unsigned i = 0; i < BCH_WRITE_REF_NR; i++)
1175 		if (atomic_long_read(&c->writes[i]))
1176 			return;
1177 
1178 	set_bit(BCH_FS_write_disable_complete, &c->flags);
1179 	wake_up(&bch2_read_only_wait);
1180 #else
1181 	percpu_ref_put(&c->writes);
1182 #endif
1183 }
1184 
1185 static inline bool bch2_ro_ref_tryget(struct bch_fs *c)
1186 {
1187 	if (test_bit(BCH_FS_stopping, &c->flags))
1188 		return false;
1189 
1190 	return refcount_inc_not_zero(&c->ro_ref);
1191 }
1192 
1193 static inline void bch2_ro_ref_put(struct bch_fs *c)
1194 {
1195 	if (refcount_dec_and_test(&c->ro_ref))
1196 		wake_up(&c->ro_ref_wait);
1197 }
1198 
1199 static inline void bch2_set_ra_pages(struct bch_fs *c, unsigned ra_pages)
1200 {
1201 #ifndef NO_BCACHEFS_FS
1202 	if (c->vfs_sb)
1203 		c->vfs_sb->s_bdi->ra_pages = ra_pages;
1204 #endif
1205 }
1206 
1207 static inline unsigned bucket_bytes(const struct bch_dev *ca)
1208 {
1209 	return ca->mi.bucket_size << 9;
1210 }
1211 
1212 static inline unsigned block_bytes(const struct bch_fs *c)
1213 {
1214 	return c->opts.block_size;
1215 }
1216 
1217 static inline unsigned block_sectors(const struct bch_fs *c)
1218 {
1219 	return c->opts.block_size >> 9;
1220 }
1221 
1222 static inline bool btree_id_cached(const struct bch_fs *c, enum btree_id btree)
1223 {
1224 	return c->btree_key_cache_btrees & (1U << btree);
1225 }
1226 
1227 static inline struct timespec64 bch2_time_to_timespec(const struct bch_fs *c, s64 time)
1228 {
1229 	struct timespec64 t;
1230 	s32 rem;
1231 
1232 	time += c->sb.time_base_lo;
1233 
1234 	t.tv_sec = div_s64_rem(time, c->sb.time_units_per_sec, &rem);
1235 	t.tv_nsec = rem * c->sb.nsec_per_time_unit;
1236 	return t;
1237 }
1238 
1239 static inline s64 timespec_to_bch2_time(const struct bch_fs *c, struct timespec64 ts)
1240 {
1241 	return (ts.tv_sec * c->sb.time_units_per_sec +
1242 		(int) ts.tv_nsec / c->sb.nsec_per_time_unit) - c->sb.time_base_lo;
1243 }
1244 
1245 static inline s64 bch2_current_time(const struct bch_fs *c)
1246 {
1247 	struct timespec64 now;
1248 
1249 	ktime_get_coarse_real_ts64(&now);
1250 	return timespec_to_bch2_time(c, now);
1251 }
1252 
1253 static inline bool bch2_dev_exists2(const struct bch_fs *c, unsigned dev)
1254 {
1255 	return dev < c->sb.nr_devices && c->devs[dev];
1256 }
1257 
1258 static inline struct stdio_redirect *bch2_fs_stdio_redirect(struct bch_fs *c)
1259 {
1260 	struct stdio_redirect *stdio = c->stdio;
1261 
1262 	if (c->stdio_filter && c->stdio_filter != current)
1263 		stdio = NULL;
1264 	return stdio;
1265 }
1266 
1267 static inline unsigned metadata_replicas_required(struct bch_fs *c)
1268 {
1269 	return min(c->opts.metadata_replicas,
1270 		   c->opts.metadata_replicas_required);
1271 }
1272 
1273 static inline unsigned data_replicas_required(struct bch_fs *c)
1274 {
1275 	return min(c->opts.data_replicas,
1276 		   c->opts.data_replicas_required);
1277 }
1278 
1279 #define BKEY_PADDED_ONSTACK(key, pad)				\
1280 	struct { struct bkey_i key; __u64 key ## _pad[pad]; }
1281 
1282 #endif /* _BCACHEFS_H */
1283