1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _BCACHEFS_UTIL_H
3 #define _BCACHEFS_UTIL_H
6 #include <linux/blkdev.h>
7 #include <linux/closure.h>
8 #include <linux/errno.h>
9 #include <linux/freezer.h>
10 #include <linux/kernel.h>
11 #include <linux/sched/clock.h>
12 #include <linux/llist.h>
13 #include <linux/log2.h>
14 #include <linux/percpu.h>
15 #include <linux/preempt.h>
16 #include <linux/ratelimit.h>
17 #include <linux/slab.h>
18 #include <linux/vmalloc.h>
19 #include <linux/workqueue.h>
23 #ifdef CONFIG_BCACHEFS_DEBUG
25 #define EBUG_ON(cond) BUG_ON(cond)
26 #define atomic_dec_bug(v) BUG_ON(atomic_dec_return(v) < 0)
27 #define atomic_inc_bug(v, i) BUG_ON(atomic_inc_return(v) <= i)
28 #define atomic_sub_bug(i, v) BUG_ON(atomic_sub_return(i, v) < 0)
29 #define atomic_add_bug(i, v) BUG_ON(atomic_add_return(i, v) < 0)
30 #define atomic_long_dec_bug(v) BUG_ON(atomic_long_dec_return(v) < 0)
31 #define atomic_long_sub_bug(i, v) BUG_ON(atomic_long_sub_return(i, v) < 0)
32 #define atomic64_dec_bug(v) BUG_ON(atomic64_dec_return(v) < 0)
33 #define atomic64_inc_bug(v, i) BUG_ON(atomic64_inc_return(v) <= i)
34 #define atomic64_sub_bug(i, v) BUG_ON(atomic64_sub_return(i, v) < 0)
35 #define atomic64_add_bug(i, v) BUG_ON(atomic64_add_return(i, v) < 0)
40 #define atomic_dec_bug(v) atomic_dec(v)
41 #define atomic_inc_bug(v, i) atomic_inc(v)
42 #define atomic_sub_bug(i, v) atomic_sub(i, v)
43 #define atomic_add_bug(i, v) atomic_add(i, v)
44 #define atomic_long_dec_bug(v) atomic_long_dec(v)
45 #define atomic_long_sub_bug(i, v) atomic_long_sub(i, v)
46 #define atomic64_dec_bug(v) atomic64_dec(v)
47 #define atomic64_inc_bug(v, i) atomic64_inc(v)
48 #define atomic64_sub_bug(i, v) atomic64_sub(i, v)
49 #define atomic64_add_bug(i, v) atomic64_add(i, v)
53 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
54 #define CPU_BIG_ENDIAN 0
55 #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
56 #define CPU_BIG_ENDIAN 1
61 #define type_is_exact(_val, _type) \
62 __builtin_types_compatible_p(typeof(_val), _type)
64 #define type_is(_val, _type) \
65 (__builtin_types_compatible_p(typeof(_val), _type) || \
66 __builtin_types_compatible_p(typeof(_val), const _type))
68 /* Userspace doesn't align allocations as nicely as the kernel allocators: */
69 static inline size_t buf_pages(void *p, size_t len)
71 return DIV_ROUND_UP(len +
72 ((unsigned long) p & (PAGE_SIZE - 1)),
76 static inline void vpfree(void *p, size_t size)
78 if (is_vmalloc_addr(p))
81 free_pages((unsigned long) p, get_order(size));
84 static inline void *vpmalloc(size_t size, gfp_t gfp_mask)
86 return (void *) __get_free_pages(gfp_mask|__GFP_NOWARN,
88 __vmalloc(size, gfp_mask);
91 static inline void kvpfree(void *p, size_t size)
99 static inline void *kvpmalloc(size_t size, gfp_t gfp_mask)
101 return size < PAGE_SIZE
102 ? kmalloc(size, gfp_mask)
103 : vpmalloc(size, gfp_mask);
106 int mempool_init_kvpmalloc_pool(mempool_t *, int, size_t);
114 #define DECLARE_HEAP(type, name) HEAP(type) name
116 #define init_heap(heap, _size, gfp) \
119 (heap)->size = (_size); \
120 (heap)->data = kvpmalloc((heap)->size * sizeof((heap)->data[0]),\
124 #define free_heap(heap) \
126 kvpfree((heap)->data, (heap)->size * sizeof((heap)->data[0])); \
127 (heap)->data = NULL; \
130 #define heap_set_backpointer(h, i, _fn) \
132 void (*fn)(typeof(h), size_t) = _fn; \
137 #define heap_swap(h, i, j, set_backpointer) \
139 swap((h)->data[i], (h)->data[j]); \
140 heap_set_backpointer(h, i, set_backpointer); \
141 heap_set_backpointer(h, j, set_backpointer); \
144 #define heap_peek(h) \
146 EBUG_ON(!(h)->used); \
150 #define heap_full(h) ((h)->used == (h)->size)
152 #define heap_sift_down(h, i, cmp, set_backpointer) \
156 for (; _j * 2 + 1 < (h)->used; _j = _c) { \
158 if (_c + 1 < (h)->used && \
159 cmp(h, (h)->data[_c], (h)->data[_c + 1]) >= 0) \
162 if (cmp(h, (h)->data[_c], (h)->data[_j]) >= 0) \
164 heap_swap(h, _c, _j, set_backpointer); \
168 #define heap_sift_up(h, i, cmp, set_backpointer) \
171 size_t p = (i - 1) / 2; \
172 if (cmp(h, (h)->data[i], (h)->data[p]) >= 0) \
174 heap_swap(h, i, p, set_backpointer); \
179 #define __heap_add(h, d, cmp, set_backpointer) \
181 size_t _i = (h)->used++; \
183 heap_set_backpointer(h, _i, set_backpointer); \
185 heap_sift_up(h, _i, cmp, set_backpointer); \
189 #define heap_add(h, d, cmp, set_backpointer) \
191 bool _r = !heap_full(h); \
193 __heap_add(h, d, cmp, set_backpointer); \
197 #define heap_add_or_replace(h, new, cmp, set_backpointer) \
199 if (!heap_add(h, new, cmp, set_backpointer) && \
200 cmp(h, new, heap_peek(h)) >= 0) { \
201 (h)->data[0] = new; \
202 heap_set_backpointer(h, 0, set_backpointer); \
203 heap_sift_down(h, 0, cmp, set_backpointer); \
207 #define heap_del(h, i, cmp, set_backpointer) \
211 BUG_ON(_i >= (h)->used); \
213 heap_swap(h, _i, (h)->used, set_backpointer); \
214 heap_sift_up(h, _i, cmp, set_backpointer); \
215 heap_sift_down(h, _i, cmp, set_backpointer); \
218 #define heap_pop(h, d, cmp, set_backpointer) \
220 bool _r = (h)->used; \
222 (d) = (h)->data[0]; \
223 heap_del(h, 0, cmp, set_backpointer); \
228 #define heap_resort(heap, cmp, set_backpointer) \
231 for (_i = (ssize_t) (heap)->used / 2 - 1; _i >= 0; --_i) \
232 heap_sift_down(heap, _i, cmp, set_backpointer); \
235 #define ANYSINT_MAX(t) \
236 ((((t) 1 << (sizeof(t) * 8 - 2)) - (t) 1) * (t) 2 + (t) 1)
238 enum printbuf_units {
240 PRINTBUF_UNITS_BYTES,
241 PRINTBUF_UNITS_HUMAN_READABLE,
248 enum printbuf_units units;
251 static inline size_t printbuf_remaining(struct printbuf *buf)
253 return buf->end - buf->pos;
256 #define _PBUF(_buf, _len) \
257 ((struct printbuf) { \
259 .end = _buf + _len, \
262 #define PBUF(_buf) _PBUF(_buf, sizeof(_buf))
264 #define pr_buf(_out, ...) \
266 (_out)->pos += scnprintf((_out)->pos, printbuf_remaining(_out), \
270 static inline void printbuf_indent_push(struct printbuf *buf, unsigned spaces)
272 buf->indent += spaces;
277 static inline void printbuf_indent_pop(struct printbuf *buf, unsigned spaces)
279 buf->indent -= spaces;
282 static inline void pr_newline(struct printbuf *buf)
287 for (i = 0; i < buf->indent; i++)
291 void bch2_pr_units(struct printbuf *, s64, s64);
292 #define pr_units(...) bch2_pr_units(__VA_ARGS__)
295 static inline void pr_time(struct printbuf *out, u64 time)
297 pr_buf(out, "%llu", time);
301 static inline void pr_time(struct printbuf *out, u64 _time)
305 struct tm *tm = localtime(&time);
306 size_t err = strftime(time_str, sizeof(time_str), "%c", tm);
308 pr_buf(out, "(formatting error)");
310 pr_buf(out, "%s", time_str);
315 static inline void uuid_unparse_lower(u8 *uuid, char *out)
317 sprintf(out, "%plU", uuid);
320 #include <uuid/uuid.h>
323 static inline void pr_uuid(struct printbuf *out, u8 *uuid)
327 uuid_unparse_lower(uuid, uuid_str);
328 pr_buf(out, uuid_str);
331 int bch2_strtoint_h(const char *, int *);
332 int bch2_strtouint_h(const char *, unsigned int *);
333 int bch2_strtoll_h(const char *, long long *);
334 int bch2_strtoull_h(const char *, unsigned long long *);
335 int bch2_strtou64_h(const char *, u64 *);
337 static inline int bch2_strtol_h(const char *cp, long *res)
339 #if BITS_PER_LONG == 32
340 return bch2_strtoint_h(cp, (int *) res);
342 return bch2_strtoll_h(cp, (long long *) res);
346 static inline int bch2_strtoul_h(const char *cp, long *res)
348 #if BITS_PER_LONG == 32
349 return bch2_strtouint_h(cp, (unsigned int *) res);
351 return bch2_strtoull_h(cp, (unsigned long long *) res);
355 #define strtoi_h(cp, res) \
356 ( type_is(*res, int) ? bch2_strtoint_h(cp, (void *) res)\
357 : type_is(*res, long) ? bch2_strtol_h(cp, (void *) res)\
358 : type_is(*res, long long) ? bch2_strtoll_h(cp, (void *) res)\
359 : type_is(*res, unsigned) ? bch2_strtouint_h(cp, (void *) res)\
360 : type_is(*res, unsigned long) ? bch2_strtoul_h(cp, (void *) res)\
361 : type_is(*res, unsigned long long) ? bch2_strtoull_h(cp, (void *) res)\
364 #define strtoul_safe(cp, var) \
367 int _r = kstrtoul(cp, 10, &_v); \
373 #define strtoul_safe_clamp(cp, var, min, max) \
376 int _r = kstrtoul(cp, 10, &_v); \
378 var = clamp_t(typeof(var), _v, min, max); \
382 #define strtoul_safe_restrict(cp, var, min, max) \
385 int _r = kstrtoul(cp, 10, &_v); \
386 if (!_r && _v >= min && _v <= max) \
393 #define snprint(buf, size, var) \
394 snprintf(buf, size, \
395 type_is(var, int) ? "%i\n" \
396 : type_is(var, unsigned) ? "%u\n" \
397 : type_is(var, long) ? "%li\n" \
398 : type_is(var, unsigned long) ? "%lu\n" \
399 : type_is(var, s64) ? "%lli\n" \
400 : type_is(var, u64) ? "%llu\n" \
401 : type_is(var, char *) ? "%s\n" \
404 void bch2_hprint(struct printbuf *, s64);
406 bool bch2_is_zero(const void *, size_t);
408 void bch2_string_opt_to_text(struct printbuf *,
409 const char * const [], size_t);
411 void bch2_flags_to_text(struct printbuf *, const char * const[], u64);
412 u64 bch2_read_flag_list(char *, const char * const[]);
414 #define NR_QUANTILES 15
415 #define QUANTILE_IDX(i) inorder_to_eytzinger0(i, NR_QUANTILES)
416 #define QUANTILE_FIRST eytzinger0_first(NR_QUANTILES)
417 #define QUANTILE_LAST eytzinger0_last(NR_QUANTILES)
420 struct quantile_entry {
423 } entries[NR_QUANTILES];
426 struct time_stat_buffer {
428 struct time_stat_buffer_entry {
437 /* all fields are in nanoseconds */
438 u64 average_duration;
439 u64 average_frequency;
442 struct quantiles quantiles;
444 struct time_stat_buffer __percpu *buffer;
447 void __bch2_time_stats_update(struct time_stats *stats, u64, u64);
449 static inline void bch2_time_stats_update(struct time_stats *stats, u64 start)
451 __bch2_time_stats_update(stats, start, local_clock());
454 void bch2_time_stats_to_text(struct printbuf *, struct time_stats *);
456 void bch2_time_stats_exit(struct time_stats *);
457 void bch2_time_stats_init(struct time_stats *);
459 #define ewma_add(ewma, val, weight) \
461 typeof(ewma) _ewma = (ewma); \
462 typeof(weight) _weight = (weight); \
464 (((_ewma << _weight) - _ewma) + (val)) >> _weight; \
467 struct bch_ratelimit {
468 /* Next time we want to do some work, in nanoseconds */
472 * Rate at which we want to do work, in units per nanosecond
473 * The units here correspond to the units passed to
474 * bch2_ratelimit_increment()
479 static inline void bch2_ratelimit_reset(struct bch_ratelimit *d)
481 d->next = local_clock();
484 u64 bch2_ratelimit_delay(struct bch_ratelimit *);
485 void bch2_ratelimit_increment(struct bch_ratelimit *, u64);
487 struct bch_pd_controller {
488 struct bch_ratelimit rate;
489 unsigned long last_update;
492 s64 smoothed_derivative;
494 unsigned p_term_inverse;
498 /* for exporting to sysfs (no effect on behavior) */
500 s64 last_proportional;
504 /* If true, the rate will not increase if bch2_ratelimit_delay()
505 * is not being called often enough. */
509 void bch2_pd_controller_update(struct bch_pd_controller *, s64, s64, int);
510 void bch2_pd_controller_init(struct bch_pd_controller *);
511 size_t bch2_pd_controller_print_debug(struct bch_pd_controller *, char *);
513 #define sysfs_pd_controller_attribute(name) \
514 rw_attribute(name##_rate); \
515 rw_attribute(name##_rate_bytes); \
516 rw_attribute(name##_rate_d_term); \
517 rw_attribute(name##_rate_p_term_inverse); \
518 read_attribute(name##_rate_debug)
520 #define sysfs_pd_controller_files(name) \
521 &sysfs_##name##_rate, \
522 &sysfs_##name##_rate_bytes, \
523 &sysfs_##name##_rate_d_term, \
524 &sysfs_##name##_rate_p_term_inverse, \
525 &sysfs_##name##_rate_debug
527 #define sysfs_pd_controller_show(name, var) \
529 sysfs_hprint(name##_rate, (var)->rate.rate); \
530 sysfs_print(name##_rate_bytes, (var)->rate.rate); \
531 sysfs_print(name##_rate_d_term, (var)->d_term); \
532 sysfs_print(name##_rate_p_term_inverse, (var)->p_term_inverse); \
534 if (attr == &sysfs_##name##_rate_debug) \
535 return bch2_pd_controller_print_debug(var, buf); \
538 #define sysfs_pd_controller_store(name, var) \
540 sysfs_strtoul_clamp(name##_rate, \
541 (var)->rate.rate, 1, UINT_MAX); \
542 sysfs_strtoul_clamp(name##_rate_bytes, \
543 (var)->rate.rate, 1, UINT_MAX); \
544 sysfs_strtoul(name##_rate_d_term, (var)->d_term); \
545 sysfs_strtoul_clamp(name##_rate_p_term_inverse, \
546 (var)->p_term_inverse, 1, INT_MAX); \
549 #define container_of_or_null(ptr, type, member) \
551 typeof(ptr) _ptr = ptr; \
552 _ptr ? container_of(_ptr, type, member) : NULL; \
555 /* Does linear interpolation between powers of two */
556 static inline unsigned fract_exp_two(unsigned x, unsigned fract_bits)
558 unsigned fract = x & ~(~0 << fract_bits);
562 x += (x * fract) >> fract_bits;
567 void bch2_bio_map(struct bio *bio, void *base, size_t);
568 int bch2_bio_alloc_pages(struct bio *, size_t, gfp_t);
570 static inline sector_t bdev_sectors(struct block_device *bdev)
572 return bdev->bd_inode->i_size >> 9;
575 #define closure_bio_submit(bio, cl) \
581 #define kthread_wait_freezable(cond) \
585 set_current_state(TASK_INTERRUPTIBLE); \
586 if (kthread_should_stop()) { \
597 set_current_state(TASK_RUNNING); \
601 size_t bch2_rand_range(size_t);
603 void memcpy_to_bio(struct bio *, struct bvec_iter, const void *);
604 void memcpy_from_bio(void *, struct bio *, struct bvec_iter);
606 static inline void memcpy_u64s_small(void *dst, const void *src,
616 static inline void __memcpy_u64s(void *dst, const void *src,
621 asm volatile("rep ; movsq"
622 : "=&c" (d0), "=&D" (d1), "=&S" (d2)
623 : "0" (u64s), "1" (dst), "2" (src)
634 static inline void memcpy_u64s(void *dst, const void *src,
637 EBUG_ON(!(dst >= src + u64s * sizeof(u64) ||
638 dst + u64s * sizeof(u64) <= src));
640 __memcpy_u64s(dst, src, u64s);
643 static inline void __memmove_u64s_down(void *dst, const void *src,
646 __memcpy_u64s(dst, src, u64s);
649 static inline void memmove_u64s_down(void *dst, const void *src,
654 __memmove_u64s_down(dst, src, u64s);
657 static inline void __memmove_u64s_up_small(void *_dst, const void *_src,
660 u64 *dst = (u64 *) _dst + u64s;
661 u64 *src = (u64 *) _src + u64s;
667 static inline void memmove_u64s_up_small(void *dst, const void *src,
672 __memmove_u64s_up_small(dst, src, u64s);
675 static inline void __memmove_u64s_up(void *_dst, const void *_src,
678 u64 *dst = (u64 *) _dst + u64s - 1;
679 u64 *src = (u64 *) _src + u64s - 1;
683 asm volatile("std ;\n"
686 : "=&c" (d0), "=&D" (d1), "=&S" (d2)
687 : "0" (u64s), "1" (dst), "2" (src)
695 static inline void memmove_u64s_up(void *dst, const void *src,
700 __memmove_u64s_up(dst, src, u64s);
703 static inline void memmove_u64s(void *dst, const void *src,
707 __memmove_u64s_down(dst, src, u64s);
709 __memmove_u64s_up(dst, src, u64s);
712 /* Set the last few bytes up to a u64 boundary given an offset into a buffer. */
713 static inline void memset_u64s_tail(void *s, int c, unsigned bytes)
715 unsigned rem = round_up(bytes, sizeof(u64)) - bytes;
717 memset(s + bytes, c, rem);
720 void sort_cmp_size(void *base, size_t num, size_t size,
721 int (*cmp_func)(const void *, const void *, size_t),
722 void (*swap_func)(void *, void *, size_t));
724 /* just the memmove, doesn't update @_nr */
725 #define __array_insert_item(_array, _nr, _pos) \
726 memmove(&(_array)[(_pos) + 1], \
728 sizeof((_array)[0]) * ((_nr) - (_pos)))
730 #define array_insert_item(_array, _nr, _pos, _new_item) \
732 __array_insert_item(_array, _nr, _pos); \
734 (_array)[(_pos)] = (_new_item); \
737 #define array_remove_items(_array, _nr, _pos, _nr_to_remove) \
739 (_nr) -= (_nr_to_remove); \
740 memmove(&(_array)[(_pos)], \
741 &(_array)[(_pos) + (_nr_to_remove)], \
742 sizeof((_array)[0]) * ((_nr) - (_pos))); \
745 #define array_remove_item(_array, _nr, _pos) \
746 array_remove_items(_array, _nr, _pos, 1)
748 #define bubble_sort(_base, _nr, _cmp) \
751 bool _swapped = true; \
753 for (_end = (ssize_t) (_nr) - 1; _end > 0 && _swapped; --_end) {\
755 for (_i = 0; _i < _end; _i++) \
756 if (_cmp((_base)[_i], (_base)[_i + 1]) > 0) { \
757 swap((_base)[_i], (_base)[_i + 1]); \
763 static inline u64 percpu_u64_get(u64 __percpu *src)
768 for_each_possible_cpu(cpu)
769 ret += *per_cpu_ptr(src, cpu);
773 static inline void percpu_u64_set(u64 __percpu *dst, u64 src)
777 for_each_possible_cpu(cpu)
778 *per_cpu_ptr(dst, cpu) = 0;
779 this_cpu_write(*dst, src);
782 static inline void acc_u64s(u64 *acc, const u64 *src, unsigned nr)
786 for (i = 0; i < nr; i++)
790 static inline void acc_u64s_percpu(u64 *acc, const u64 __percpu *src,
795 for_each_possible_cpu(cpu)
796 acc_u64s(acc, per_cpu_ptr(src, cpu), nr);
799 static inline void percpu_memset(void __percpu *p, int c, size_t bytes)
803 for_each_possible_cpu(cpu)
804 memset(per_cpu_ptr(p, cpu), c, bytes);
807 u64 *bch2_acc_percpu_u64s(u64 __percpu *, unsigned);
809 #define cmp_int(l, r) ((l > r) - (l < r))
811 static inline int u8_cmp(u8 l, u8 r)
813 return cmp_int(l, r);
816 #endif /* _BCACHEFS_UTIL_H */