git.sesse.net Git - bcachefs-tools-debian/blob - libbcachefs/util.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _BCACHEFS_UTIL_H
   3 #define _BCACHEFS_UTIL_H
   4
   5 #include <linux/bio.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>
  20
  21 struct closure;
  22
  23 #ifdef CONFIG_BCACHEFS_DEBUG
  24
  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)
  36
  37 #else /* DEBUG */
  38
  39 #define EBUG_ON(cond)
  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)
  50
  51 #endif
  52
  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
  57 #endif
  58
  59 /* type hackery */
  60
  61 #define type_is_exact(_val, _type)                                      \
  62         __builtin_types_compatible_p(typeof(_val), _type)
  63
  64 #define type_is(_val, _type)                                            \
  65         (__builtin_types_compatible_p(typeof(_val), _type) ||           \
  66          __builtin_types_compatible_p(typeof(_val), const _type))
  67
  68 /* Userspace doesn't align allocations as nicely as the kernel allocators: */
  69 static inline size_t buf_pages(void *p, size_t len)
  70 {
  71         return DIV_ROUND_UP(len +
  72                             ((unsigned long) p & (PAGE_SIZE - 1)),
  73                             PAGE_SIZE);
  74 }
  75
  76 static inline void vpfree(void *p, size_t size)
  77 {
  78         if (is_vmalloc_addr(p))
  79                 vfree(p);
  80         else
  81                 free_pages((unsigned long) p, get_order(size));
  82 }
  83
  84 static inline void *vpmalloc(size_t size, gfp_t gfp_mask)
  85 {
  86         return (void *) __get_free_pages(gfp_mask|__GFP_NOWARN,
  87                                          get_order(size)) ?:
  88                 __vmalloc(size, gfp_mask);
  89 }
  90
  91 static inline void kvpfree(void *p, size_t size)
  92 {
  93         if (size < PAGE_SIZE)
  94                 kfree(p);
  95         else
  96                 vpfree(p, size);
  97 }
  98
  99 static inline void *kvpmalloc(size_t size, gfp_t gfp_mask)
 100 {
 101         return size < PAGE_SIZE
 102                 ? kmalloc(size, gfp_mask)
 103                 : vpmalloc(size, gfp_mask);
 104 }
 105
 106 int mempool_init_kvpmalloc_pool(mempool_t *, int, size_t);
 107
 108 #define HEAP(type)                                                      \
 109 struct {                                                                \
 110         size_t size, used;                                              \
 111         type *data;                                                     \
 112 }
 113
 114 #define DECLARE_HEAP(type, name) HEAP(type) name
 115
 116 #define init_heap(heap, _size, gfp)                                     \
 117 ({                                                                      \
 118         (heap)->used = 0;                                               \
 119         (heap)->size = (_size);                                         \
 120         (heap)->data = kvpmalloc((heap)->size * sizeof((heap)->data[0]),\
 121                                  (gfp));                                \
 122 })
 123
 124 #define free_heap(heap)                                                 \
 125 do {                                                                    \
 126         kvpfree((heap)->data, (heap)->size * sizeof((heap)->data[0]));  \
 127         (heap)->data = NULL;                                            \
 128 } while (0)
 129
 130 #define heap_set_backpointer(h, i, _fn)                                 \
 131 do {                                                                    \
 132         void (*fn)(typeof(h), size_t) = _fn;                            \
 133         if (fn)                                                         \
 134                 fn(h, i);                                               \
 135 } while (0)
 136
 137 #define heap_swap(h, i, j, set_backpointer)                             \
 138 do {                                                                    \
 139         swap((h)->data[i], (h)->data[j]);                               \
 140         heap_set_backpointer(h, i, set_backpointer);                    \
 141         heap_set_backpointer(h, j, set_backpointer);                    \
 142 } while (0)
 143
 144 #define heap_peek(h)                                                    \
 145 ({                                                                      \
 146         EBUG_ON(!(h)->used);                                            \
 147         (h)->data[0];                                                   \
 148 })
 149
 150 #define heap_full(h)    ((h)->used == (h)->size)
 151
 152 #define heap_sift_down(h, i, cmp, set_backpointer)                      \
 153 do {                                                                    \
 154         size_t _c, _j = i;                                              \
 155                                                                         \
 156         for (; _j * 2 + 1 < (h)->used; _j = _c) {                       \
 157                 _c = _j * 2 + 1;                                        \
 158                 if (_c + 1 < (h)->used &&                               \
 159                     cmp(h, (h)->data[_c], (h)->data[_c + 1]) >= 0)      \
 160                         _c++;                                           \
 161                                                                         \
 162                 if (cmp(h, (h)->data[_c], (h)->data[_j]) >= 0)          \
 163                         break;                                          \
 164                 heap_swap(h, _c, _j, set_backpointer);                  \
 165         }                                                               \
 166 } while (0)
 167
 168 #define heap_sift_up(h, i, cmp, set_backpointer)                        \
 169 do {                                                                    \
 170         while (i) {                                                     \
 171                 size_t p = (i - 1) / 2;                                 \
 172                 if (cmp(h, (h)->data[i], (h)->data[p]) >= 0)            \
 173                         break;                                          \
 174                 heap_swap(h, i, p, set_backpointer);                    \
 175                 i = p;                                                  \
 176         }                                                               \
 177 } while (0)
 178
 179 #define __heap_add(h, d, cmp, set_backpointer)                          \
 180 ({                                                                      \
 181         size_t _i = (h)->used++;                                        \
 182         (h)->data[_i] = d;                                              \
 183         heap_set_backpointer(h, _i, set_backpointer);                   \
 184                                                                         \
 185         heap_sift_up(h, _i, cmp, set_backpointer);                      \
 186         _i;                                                             \
 187 })
 188
 189 #define heap_add(h, d, cmp, set_backpointer)                            \
 190 ({                                                                      \
 191         bool _r = !heap_full(h);                                        \
 192         if (_r)                                                         \
 193                 __heap_add(h, d, cmp, set_backpointer);                 \
 194         _r;                                                             \
 195 })
 196
 197 #define heap_add_or_replace(h, new, cmp, set_backpointer)               \
 198 do {                                                                    \
 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);             \
 204         }                                                               \
 205 } while (0)
 206
 207 #define heap_del(h, i, cmp, set_backpointer)                            \
 208 do {                                                                    \
 209         size_t _i = (i);                                                \
 210                                                                         \
 211         BUG_ON(_i >= (h)->used);                                        \
 212         (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);                    \
 216 } while (0)
 217
 218 #define heap_pop(h, d, cmp, set_backpointer)                            \
 219 ({                                                                      \
 220         bool _r = (h)->used;                                            \
 221         if (_r) {                                                       \
 222                 (d) = (h)->data[0];                                     \
 223                 heap_del(h, 0, cmp, set_backpointer);                   \
 224         }                                                               \
 225         _r;                                                             \
 226 })
 227
 228 #define heap_resort(heap, cmp, set_backpointer)                         \
 229 do {                                                                    \
 230         ssize_t _i;                                                     \
 231         for (_i = (ssize_t) (heap)->used / 2 -  1; _i >= 0; --_i)       \
 232                 heap_sift_down(heap, _i, cmp, set_backpointer);         \
 233 } while (0)
 234
 235 #define ANYSINT_MAX(t)                                                  \
 236         ((((t) 1 << (sizeof(t) * 8 - 2)) - (t) 1) * (t) 2 + (t) 1)
 237
 238 enum printbuf_units {
 239         PRINTBUF_UNITS_RAW,
 240         PRINTBUF_UNITS_BYTES,
 241         PRINTBUF_UNITS_HUMAN_READABLE,
 242 };
 243
 244 struct printbuf {
 245         char                    *buf;
 246         unsigned                size;
 247         unsigned                pos;
 248         unsigned                last_newline;
 249         unsigned                last_field;
 250         unsigned                indent;
 251         enum printbuf_units     units:8;
 252         u8                      atomic;
 253         bool                    allocation_failure:1;
 254         u8                      tabstop;
 255         u8                      tabstops[4];
 256 };
 257
 258 #define PRINTBUF ((struct printbuf) { NULL })
 259
 260 static inline void printbuf_exit(struct printbuf *buf)
 261 {
 262         kfree(buf->buf);
 263         buf->buf = ERR_PTR(-EINTR); /* poison value */
 264 }
 265
 266 static inline void printbuf_reset(struct printbuf *buf)
 267 {
 268         buf->pos                = 0;
 269         buf->last_newline       = 0;
 270         buf->last_field         = 0;
 271         buf->indent             = 0;
 272         buf->tabstop            = 0;
 273 }
 274
 275 static inline size_t printbuf_remaining(struct printbuf *buf)
 276 {
 277         return buf->size - buf->pos;
 278 }
 279
 280 static inline size_t printbuf_linelen(struct printbuf *buf)
 281 {
 282         return buf->pos - buf->last_newline;
 283 }
 284
 285 void bch2_pr_buf(struct printbuf *out, const char *fmt, ...);
 286
 287 #define pr_buf(_out, ...) bch2_pr_buf(_out, __VA_ARGS__)
 288
 289 static inline void pr_char(struct printbuf *out, char c)
 290 {
 291         bch2_pr_buf(out, "%c", c);
 292 }
 293
 294 static inline void pr_indent_push(struct printbuf *buf, unsigned spaces)
 295 {
 296         buf->indent += spaces;
 297         while (spaces--)
 298                 pr_char(buf, ' ');
 299 }
 300
 301 static inline void pr_indent_pop(struct printbuf *buf, unsigned spaces)
 302 {
 303         buf->indent -= spaces;
 304 }
 305
 306 static inline void pr_newline(struct printbuf *buf)
 307 {
 308         unsigned i;
 309
 310         pr_char(buf, '\n');
 311
 312         buf->last_newline       = buf->pos;
 313
 314         for (i = 0; i < buf->indent; i++)
 315                 pr_char(buf, ' ');
 316
 317         buf->last_field         = buf->pos;
 318         buf->tabstop = 0;
 319 }
 320
 321 static inline void pr_tab(struct printbuf *buf)
 322 {
 323         BUG_ON(buf->tabstop > ARRAY_SIZE(buf->tabstops));
 324
 325         while (printbuf_remaining(buf) > 1 &&
 326                printbuf_linelen(buf) < buf->tabstops[buf->tabstop])
 327                 pr_char(buf, ' ');
 328
 329         buf->last_field = buf->pos;
 330         buf->tabstop++;
 331 }
 332
 333 static inline void pr_tab_rjust(struct printbuf *buf)
 334 {
 335         ssize_t shift = min_t(ssize_t, buf->tabstops[buf->tabstop] -
 336                               printbuf_linelen(buf),
 337                               printbuf_remaining(buf));
 338         ssize_t move = min_t(ssize_t, buf->pos - buf->last_field,
 339                              printbuf_remaining(buf) - shift);
 340
 341         BUG_ON(buf->tabstop > ARRAY_SIZE(buf->tabstops));
 342
 343         if (shift > 0) {
 344                 memmove(buf->buf + buf->last_field + shift,
 345                         buf->buf + buf->last_field,
 346                         move);
 347                 memset(buf->buf + buf->last_field, ' ', shift);
 348                 buf->pos += shift;
 349                 buf->buf[buf->pos] = 0;
 350         }
 351
 352         buf->last_field = buf->pos;
 353         buf->tabstop++;
 354 }
 355
 356 void bch2_pr_units(struct printbuf *, s64, s64);
 357 #define pr_units(...) bch2_pr_units(__VA_ARGS__)
 358
 359 static inline void pr_sectors(struct printbuf *out, u64 v)
 360 {
 361         bch2_pr_units(out, v, v << 9);
 362 }
 363
 364 #ifdef __KERNEL__
 365 static inline void pr_time(struct printbuf *out, u64 time)
 366 {
 367         pr_buf(out, "%llu", time);
 368 }
 369 #else
 370 #include <time.h>
 371 static inline void pr_time(struct printbuf *out, u64 _time)
 372 {
 373         char time_str[64];
 374         time_t time = _time;
 375         struct tm *tm = localtime(&time);
 376         size_t err = strftime(time_str, sizeof(time_str), "%c", tm);
 377         if (!err)
 378                 pr_buf(out, "(formatting error)");
 379         else
 380                 pr_buf(out, "%s", time_str);
 381 }
 382 #endif
 383
 384 #ifdef __KERNEL__
 385 static inline void uuid_unparse_lower(u8 *uuid, char *out)
 386 {
 387         sprintf(out, "%plU", uuid);
 388 }
 389 #else
 390 #include <uuid/uuid.h>
 391 #endif
 392
 393 static inline void pr_uuid(struct printbuf *out, u8 *uuid)
 394 {
 395         char uuid_str[40];
 396
 397         uuid_unparse_lower(uuid, uuid_str);
 398         pr_buf(out, uuid_str);
 399 }
 400
 401 int bch2_strtoint_h(const char *, int *);
 402 int bch2_strtouint_h(const char *, unsigned int *);
 403 int bch2_strtoll_h(const char *, long long *);
 404 int bch2_strtoull_h(const char *, unsigned long long *);
 405 int bch2_strtou64_h(const char *, u64 *);
 406
 407 static inline int bch2_strtol_h(const char *cp, long *res)
 408 {
 409 #if BITS_PER_LONG == 32
 410         return bch2_strtoint_h(cp, (int *) res);
 411 #else
 412         return bch2_strtoll_h(cp, (long long *) res);
 413 #endif
 414 }
 415
 416 static inline int bch2_strtoul_h(const char *cp, long *res)
 417 {
 418 #if BITS_PER_LONG == 32
 419         return bch2_strtouint_h(cp, (unsigned int *) res);
 420 #else
 421         return bch2_strtoull_h(cp, (unsigned long long *) res);
 422 #endif
 423 }
 424
 425 #define strtoi_h(cp, res)                                               \
 426         ( type_is(*res, int)            ? bch2_strtoint_h(cp, (void *) res)\
 427         : type_is(*res, long)           ? bch2_strtol_h(cp, (void *) res)\
 428         : type_is(*res, long long)      ? bch2_strtoll_h(cp, (void *) res)\
 429         : type_is(*res, unsigned)       ? bch2_strtouint_h(cp, (void *) res)\
 430         : type_is(*res, unsigned long)  ? bch2_strtoul_h(cp, (void *) res)\
 431         : type_is(*res, unsigned long long) ? bch2_strtoull_h(cp, (void *) res)\
 432         : -EINVAL)
 433
 434 #define strtoul_safe(cp, var)                                           \
 435 ({                                                                      \
 436         unsigned long _v;                                               \
 437         int _r = kstrtoul(cp, 10, &_v);                                 \
 438         if (!_r)                                                        \
 439                 var = _v;                                               \
 440         _r;                                                             \
 441 })
 442
 443 #define strtoul_safe_clamp(cp, var, min, max)                           \
 444 ({                                                                      \
 445         unsigned long _v;                                               \
 446         int _r = kstrtoul(cp, 10, &_v);                                 \
 447         if (!_r)                                                        \
 448                 var = clamp_t(typeof(var), _v, min, max);               \
 449         _r;                                                             \
 450 })
 451
 452 #define strtoul_safe_restrict(cp, var, min, max)                        \
 453 ({                                                                      \
 454         unsigned long _v;                                               \
 455         int _r = kstrtoul(cp, 10, &_v);                                 \
 456         if (!_r && _v >= min && _v <= max)                              \
 457                 var = _v;                                               \
 458         else                                                            \
 459                 _r = -EINVAL;                                           \
 460         _r;                                                             \
 461 })
 462
 463 #define snprint(out, var)                                               \
 464         pr_buf(out,                                                     \
 465                    type_is(var, int)            ? "%i\n"                \
 466                  : type_is(var, unsigned)       ? "%u\n"                \
 467                  : type_is(var, long)           ? "%li\n"               \
 468                  : type_is(var, unsigned long)  ? "%lu\n"               \
 469                  : type_is(var, s64)            ? "%lli\n"              \
 470                  : type_is(var, u64)            ? "%llu\n"              \
 471                  : type_is(var, char *)         ? "%s\n"                \
 472                  : "%i\n", var)
 473
 474 void bch2_hprint(struct printbuf *, s64);
 475
 476 bool bch2_is_zero(const void *, size_t);
 477
 478 void bch2_string_opt_to_text(struct printbuf *,
 479                              const char * const [], size_t);
 480
 481 void bch2_flags_to_text(struct printbuf *, const char * const[], u64);
 482 u64 bch2_read_flag_list(char *, const char * const[]);
 483
 484 #define NR_QUANTILES    15
 485 #define QUANTILE_IDX(i) inorder_to_eytzinger0(i, NR_QUANTILES)
 486 #define QUANTILE_FIRST  eytzinger0_first(NR_QUANTILES)
 487 #define QUANTILE_LAST   eytzinger0_last(NR_QUANTILES)
 488
 489 struct quantiles {
 490         struct quantile_entry {
 491                 u64     m;
 492                 u64     step;
 493         }               entries[NR_QUANTILES];
 494 };
 495
 496 struct time_stat_buffer {
 497         unsigned        nr;
 498         struct time_stat_buffer_entry {
 499                 u64     start;
 500                 u64     end;
 501         }               entries[32];
 502 };
 503
 504 struct time_stats {
 505         spinlock_t      lock;
 506         u64             count;
 507         /* all fields are in nanoseconds */
 508         u64             average_duration;
 509         u64             average_frequency;
 510         u64             max_duration;
 511         u64             last_event;
 512         struct quantiles quantiles;
 513
 514         struct time_stat_buffer __percpu *buffer;
 515 };
 516
 517 void __bch2_time_stats_update(struct time_stats *stats, u64, u64);
 518
 519 static inline void bch2_time_stats_update(struct time_stats *stats, u64 start)
 520 {
 521         __bch2_time_stats_update(stats, start, local_clock());
 522 }
 523
 524 void bch2_time_stats_to_text(struct printbuf *, struct time_stats *);
 525
 526 void bch2_time_stats_exit(struct time_stats *);
 527 void bch2_time_stats_init(struct time_stats *);
 528
 529 #define ewma_add(ewma, val, weight)                                     \
 530 ({                                                                      \
 531         typeof(ewma) _ewma = (ewma);                                    \
 532         typeof(weight) _weight = (weight);                              \
 533                                                                         \
 534         (((_ewma << _weight) - _ewma) + (val)) >> _weight;              \
 535 })
 536
 537 struct bch_ratelimit {
 538         /* Next time we want to do some work, in nanoseconds */
 539         u64                     next;
 540
 541         /*
 542          * Rate at which we want to do work, in units per nanosecond
 543          * The units here correspond to the units passed to
 544          * bch2_ratelimit_increment()
 545          */
 546         unsigned                rate;
 547 };
 548
 549 static inline void bch2_ratelimit_reset(struct bch_ratelimit *d)
 550 {
 551         d->next = local_clock();
 552 }
 553
 554 u64 bch2_ratelimit_delay(struct bch_ratelimit *);
 555 void bch2_ratelimit_increment(struct bch_ratelimit *, u64);
 556
 557 struct bch_pd_controller {
 558         struct bch_ratelimit    rate;
 559         unsigned long           last_update;
 560
 561         s64                     last_actual;
 562         s64                     smoothed_derivative;
 563
 564         unsigned                p_term_inverse;
 565         unsigned                d_smooth;
 566         unsigned                d_term;
 567
 568         /* for exporting to sysfs (no effect on behavior) */
 569         s64                     last_derivative;
 570         s64                     last_proportional;
 571         s64                     last_change;
 572         s64                     last_target;
 573
 574         /* If true, the rate will not increase if bch2_ratelimit_delay()
 575          * is not being called often enough. */
 576         bool                    backpressure;
 577 };
 578
 579 void bch2_pd_controller_update(struct bch_pd_controller *, s64, s64, int);
 580 void bch2_pd_controller_init(struct bch_pd_controller *);
 581 void bch2_pd_controller_debug_to_text(struct printbuf *, struct bch_pd_controller *);
 582
 583 #define sysfs_pd_controller_attribute(name)                             \
 584         rw_attribute(name##_rate);                                      \
 585         rw_attribute(name##_rate_bytes);                                \
 586         rw_attribute(name##_rate_d_term);                               \
 587         rw_attribute(name##_rate_p_term_inverse);                       \
 588         read_attribute(name##_rate_debug)
 589
 590 #define sysfs_pd_controller_files(name)                                 \
 591         &sysfs_##name##_rate,                                           \
 592         &sysfs_##name##_rate_bytes,                                     \
 593         &sysfs_##name##_rate_d_term,                                    \
 594         &sysfs_##name##_rate_p_term_inverse,                            \
 595         &sysfs_##name##_rate_debug
 596
 597 #define sysfs_pd_controller_show(name, var)                             \
 598 do {                                                                    \
 599         sysfs_hprint(name##_rate,               (var)->rate.rate);      \
 600         sysfs_print(name##_rate_bytes,          (var)->rate.rate);      \
 601         sysfs_print(name##_rate_d_term,         (var)->d_term);         \
 602         sysfs_print(name##_rate_p_term_inverse, (var)->p_term_inverse); \
 603                                                                         \
 604         if (attr == &sysfs_##name##_rate_debug)                         \
 605                 bch2_pd_controller_debug_to_text(out, var);             \
 606 } while (0)
 607
 608 #define sysfs_pd_controller_store(name, var)                            \
 609 do {                                                                    \
 610         sysfs_strtoul_clamp(name##_rate,                                \
 611                             (var)->rate.rate, 1, UINT_MAX);             \
 612         sysfs_strtoul_clamp(name##_rate_bytes,                          \
 613                             (var)->rate.rate, 1, UINT_MAX);             \
 614         sysfs_strtoul(name##_rate_d_term,       (var)->d_term);         \
 615         sysfs_strtoul_clamp(name##_rate_p_term_inverse,                 \
 616                             (var)->p_term_inverse, 1, INT_MAX);         \
 617 } while (0)
 618
 619 #define container_of_or_null(ptr, type, member)                         \
 620 ({                                                                      \
 621         typeof(ptr) _ptr = ptr;                                         \
 622         _ptr ? container_of(_ptr, type, member) : NULL;                 \
 623 })
 624
 625 /* Does linear interpolation between powers of two */
 626 static inline unsigned fract_exp_two(unsigned x, unsigned fract_bits)
 627 {
 628         unsigned fract = x & ~(~0 << fract_bits);
 629
 630         x >>= fract_bits;
 631         x   = 1 << x;
 632         x  += (x * fract) >> fract_bits;
 633
 634         return x;
 635 }
 636
 637 void bch2_bio_map(struct bio *bio, void *base, size_t);
 638 int bch2_bio_alloc_pages(struct bio *, size_t, gfp_t);
 639
 640 static inline sector_t bdev_sectors(struct block_device *bdev)
 641 {
 642         return bdev->bd_inode->i_size >> 9;
 643 }
 644
 645 #define closure_bio_submit(bio, cl)                                     \
 646 do {                                                                    \
 647         closure_get(cl);                                                \
 648         submit_bio(bio);                                                \
 649 } while (0)
 650
 651 #define kthread_wait_freezable(cond)                                    \
 652 ({                                                                      \
 653         int _ret = 0;                                                   \
 654         while (1) {                                                     \
 655                 set_current_state(TASK_INTERRUPTIBLE);                  \
 656                 if (kthread_should_stop()) {                            \
 657                         _ret = -1;                                      \
 658                         break;                                          \
 659                 }                                                       \
 660                                                                         \
 661                 if (cond)                                               \
 662                         break;                                          \
 663                                                                         \
 664                 schedule();                                             \
 665                 try_to_freeze();                                        \
 666         }                                                               \
 667         set_current_state(TASK_RUNNING);                                \
 668         _ret;                                                           \
 669 })
 670
 671 size_t bch2_rand_range(size_t);
 672
 673 void memcpy_to_bio(struct bio *, struct bvec_iter, const void *);
 674 void memcpy_from_bio(void *, struct bio *, struct bvec_iter);
 675
 676 static inline void memcpy_u64s_small(void *dst, const void *src,
 677                                      unsigned u64s)
 678 {
 679         u64 *d = dst;
 680         const u64 *s = src;
 681
 682         while (u64s--)
 683                 *d++ = *s++;
 684 }
 685
 686 static inline void __memcpy_u64s(void *dst, const void *src,
 687                                  unsigned u64s)
 688 {
 689 #ifdef CONFIG_X86_64
 690         long d0, d1, d2;
 691         asm volatile("rep ; movsq"
 692                      : "=&c" (d0), "=&D" (d1), "=&S" (d2)
 693                      : "0" (u64s), "1" (dst), "2" (src)
 694                      : "memory");
 695 #else
 696         u64 *d = dst;
 697         const u64 *s = src;
 698
 699         while (u64s--)
 700                 *d++ = *s++;
 701 #endif
 702 }
 703
 704 static inline void memcpy_u64s(void *dst, const void *src,
 705                                unsigned u64s)
 706 {
 707         EBUG_ON(!(dst >= src + u64s * sizeof(u64) ||
 708                  dst + u64s * sizeof(u64) <= src));
 709
 710         __memcpy_u64s(dst, src, u64s);
 711 }
 712
 713 static inline void __memmove_u64s_down(void *dst, const void *src,
 714                                        unsigned u64s)
 715 {
 716         __memcpy_u64s(dst, src, u64s);
 717 }
 718
 719 static inline void memmove_u64s_down(void *dst, const void *src,
 720                                      unsigned u64s)
 721 {
 722         EBUG_ON(dst > src);
 723
 724         __memmove_u64s_down(dst, src, u64s);
 725 }
 726
 727 static inline void __memmove_u64s_up_small(void *_dst, const void *_src,
 728                                            unsigned u64s)
 729 {
 730         u64 *dst = (u64 *) _dst + u64s;
 731         u64 *src = (u64 *) _src + u64s;
 732
 733         while (u64s--)
 734                 *--dst = *--src;
 735 }
 736
 737 static inline void memmove_u64s_up_small(void *dst, const void *src,
 738                                          unsigned u64s)
 739 {
 740         EBUG_ON(dst < src);
 741
 742         __memmove_u64s_up_small(dst, src, u64s);
 743 }
 744
 745 static inline void __memmove_u64s_up(void *_dst, const void *_src,
 746                                      unsigned u64s)
 747 {
 748         u64 *dst = (u64 *) _dst + u64s - 1;
 749         u64 *src = (u64 *) _src + u64s - 1;
 750
 751 #ifdef CONFIG_X86_64
 752         long d0, d1, d2;
 753         asm volatile("std ;\n"
 754                      "rep ; movsq\n"
 755                      "cld ;\n"
 756                      : "=&c" (d0), "=&D" (d1), "=&S" (d2)
 757                      : "0" (u64s), "1" (dst), "2" (src)
 758                      : "memory");
 759 #else
 760         while (u64s--)
 761                 *dst-- = *src--;
 762 #endif
 763 }
 764
 765 static inline void memmove_u64s_up(void *dst, const void *src,
 766                                    unsigned u64s)
 767 {
 768         EBUG_ON(dst < src);
 769
 770         __memmove_u64s_up(dst, src, u64s);
 771 }
 772
 773 static inline void memmove_u64s(void *dst, const void *src,
 774                                 unsigned u64s)
 775 {
 776         if (dst < src)
 777                 __memmove_u64s_down(dst, src, u64s);
 778         else
 779                 __memmove_u64s_up(dst, src, u64s);
 780 }
 781
 782 /* Set the last few bytes up to a u64 boundary given an offset into a buffer. */
 783 static inline void memset_u64s_tail(void *s, int c, unsigned bytes)
 784 {
 785         unsigned rem = round_up(bytes, sizeof(u64)) - bytes;
 786
 787         memset(s + bytes, c, rem);
 788 }
 789
 790 void sort_cmp_size(void *base, size_t num, size_t size,
 791           int (*cmp_func)(const void *, const void *, size_t),
 792           void (*swap_func)(void *, void *, size_t));
 793
 794 /* just the memmove, doesn't update @_nr */
 795 #define __array_insert_item(_array, _nr, _pos)                          \
 796         memmove(&(_array)[(_pos) + 1],                                  \
 797                 &(_array)[(_pos)],                                      \
 798                 sizeof((_array)[0]) * ((_nr) - (_pos)))
 799
 800 #define array_insert_item(_array, _nr, _pos, _new_item)                 \
 801 do {                                                                    \
 802         __array_insert_item(_array, _nr, _pos);                         \
 803         (_nr)++;                                                        \
 804         (_array)[(_pos)] = (_new_item);                                 \
 805 } while (0)
 806
 807 #define array_remove_items(_array, _nr, _pos, _nr_to_remove)            \
 808 do {                                                                    \
 809         (_nr) -= (_nr_to_remove);                                       \
 810         memmove(&(_array)[(_pos)],                                      \
 811                 &(_array)[(_pos) + (_nr_to_remove)],                    \
 812                 sizeof((_array)[0]) * ((_nr) - (_pos)));                \
 813 } while (0)
 814
 815 #define array_remove_item(_array, _nr, _pos)                            \
 816         array_remove_items(_array, _nr, _pos, 1)
 817
 818 #define bubble_sort(_base, _nr, _cmp)                                   \
 819 do {                                                                    \
 820         ssize_t _i, _end;                                               \
 821         bool _swapped = true;                                           \
 822                                                                         \
 823         for (_end = (ssize_t) (_nr) - 1; _end > 0 && _swapped; --_end) {\
 824                 _swapped = false;                                       \
 825                 for (_i = 0; _i < _end; _i++)                           \
 826                         if (_cmp((_base)[_i], (_base)[_i + 1]) > 0) {   \
 827                                 swap((_base)[_i], (_base)[_i + 1]);     \
 828                                 _swapped = true;                        \
 829                         }                                               \
 830         }                                                               \
 831 } while (0)
 832
 833 static inline u64 percpu_u64_get(u64 __percpu *src)
 834 {
 835         u64 ret = 0;
 836         int cpu;
 837
 838         for_each_possible_cpu(cpu)
 839                 ret += *per_cpu_ptr(src, cpu);
 840         return ret;
 841 }
 842
 843 static inline void percpu_u64_set(u64 __percpu *dst, u64 src)
 844 {
 845         int cpu;
 846
 847         for_each_possible_cpu(cpu)
 848                 *per_cpu_ptr(dst, cpu) = 0;
 849         this_cpu_write(*dst, src);
 850 }
 851
 852 static inline void acc_u64s(u64 *acc, const u64 *src, unsigned nr)
 853 {
 854         unsigned i;
 855
 856         for (i = 0; i < nr; i++)
 857                 acc[i] += src[i];
 858 }
 859
 860 static inline void acc_u64s_percpu(u64 *acc, const u64 __percpu *src,
 861                                    unsigned nr)
 862 {
 863         int cpu;
 864
 865         for_each_possible_cpu(cpu)
 866                 acc_u64s(acc, per_cpu_ptr(src, cpu), nr);
 867 }
 868
 869 static inline void percpu_memset(void __percpu *p, int c, size_t bytes)
 870 {
 871         int cpu;
 872
 873         for_each_possible_cpu(cpu)
 874                 memset(per_cpu_ptr(p, cpu), c, bytes);
 875 }
 876
 877 u64 *bch2_acc_percpu_u64s(u64 __percpu *, unsigned);
 878
 879 #define cmp_int(l, r)           ((l > r) - (l < r))
 880
 881 static inline int u8_cmp(u8 l, u8 r)
 882 {
 883         return cmp_int(l, r);
 884 }
 885
 886 #endif /* _BCACHEFS_UTIL_H */