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 #include <linux/mean_and_variance.h>
  21
  22 #include "darray.h"
  23
  24 struct closure;
  25
  26 #ifdef CONFIG_BCACHEFS_DEBUG
  27 #define EBUG_ON(cond)           BUG_ON(cond)
  28 #else
  29 #define EBUG_ON(cond)
  30 #endif
  31
  32 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
  33 #define CPU_BIG_ENDIAN          0
  34 #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
  35 #define CPU_BIG_ENDIAN          1
  36 #endif
  37
  38 /* type hackery */
  39
  40 #define type_is_exact(_val, _type)                                      \
  41         __builtin_types_compatible_p(typeof(_val), _type)
  42
  43 #define type_is(_val, _type)                                            \
  44         (__builtin_types_compatible_p(typeof(_val), _type) ||           \
  45          __builtin_types_compatible_p(typeof(_val), const _type))
  46
  47 /* Userspace doesn't align allocations as nicely as the kernel allocators: */
  48 static inline size_t buf_pages(void *p, size_t len)
  49 {
  50         return DIV_ROUND_UP(len +
  51                             ((unsigned long) p & (PAGE_SIZE - 1)),
  52                             PAGE_SIZE);
  53 }
  54
  55 static inline void vpfree(void *p, size_t size)
  56 {
  57         if (is_vmalloc_addr(p))
  58                 vfree(p);
  59         else
  60                 free_pages((unsigned long) p, get_order(size));
  61 }
  62
  63 static inline void *vpmalloc(size_t size, gfp_t gfp_mask)
  64 {
  65         return (void *) __get_free_pages(gfp_mask|__GFP_NOWARN,
  66                                          get_order(size)) ?:
  67                 __vmalloc(size, gfp_mask);
  68 }
  69
  70 static inline void kvpfree(void *p, size_t size)
  71 {
  72         if (size < PAGE_SIZE)
  73                 kfree(p);
  74         else
  75                 vpfree(p, size);
  76 }
  77
  78 static inline void *kvpmalloc(size_t size, gfp_t gfp_mask)
  79 {
  80         return size < PAGE_SIZE
  81                 ? kmalloc(size, gfp_mask)
  82                 : vpmalloc(size, gfp_mask);
  83 }
  84
  85 int mempool_init_kvpmalloc_pool(mempool_t *, int, size_t);
  86
  87 #define HEAP(type)                                                      \
  88 struct {                                                                \
  89         size_t size, used;                                              \
  90         type *data;                                                     \
  91 }
  92
  93 #define DECLARE_HEAP(type, name) HEAP(type) name
  94
  95 #define init_heap(heap, _size, gfp)                                     \
  96 ({                                                                      \
  97         (heap)->used = 0;                                               \
  98         (heap)->size = (_size);                                         \
  99         (heap)->data = kvpmalloc((heap)->size * sizeof((heap)->data[0]),\
 100                                  (gfp));                                \
 101 })
 102
 103 #define free_heap(heap)                                                 \
 104 do {                                                                    \
 105         kvpfree((heap)->data, (heap)->size * sizeof((heap)->data[0]));  \
 106         (heap)->data = NULL;                                            \
 107 } while (0)
 108
 109 #define heap_set_backpointer(h, i, _fn)                                 \
 110 do {                                                                    \
 111         void (*fn)(typeof(h), size_t) = _fn;                            \
 112         if (fn)                                                         \
 113                 fn(h, i);                                               \
 114 } while (0)
 115
 116 #define heap_swap(h, i, j, set_backpointer)                             \
 117 do {                                                                    \
 118         swap((h)->data[i], (h)->data[j]);                               \
 119         heap_set_backpointer(h, i, set_backpointer);                    \
 120         heap_set_backpointer(h, j, set_backpointer);                    \
 121 } while (0)
 122
 123 #define heap_peek(h)                                                    \
 124 ({                                                                      \
 125         EBUG_ON(!(h)->used);                                            \
 126         (h)->data[0];                                                   \
 127 })
 128
 129 #define heap_full(h)    ((h)->used == (h)->size)
 130
 131 #define heap_sift_down(h, i, cmp, set_backpointer)                      \
 132 do {                                                                    \
 133         size_t _c, _j = i;                                              \
 134                                                                         \
 135         for (; _j * 2 + 1 < (h)->used; _j = _c) {                       \
 136                 _c = _j * 2 + 1;                                        \
 137                 if (_c + 1 < (h)->used &&                               \
 138                     cmp(h, (h)->data[_c], (h)->data[_c + 1]) >= 0)      \
 139                         _c++;                                           \
 140                                                                         \
 141                 if (cmp(h, (h)->data[_c], (h)->data[_j]) >= 0)          \
 142                         break;                                          \
 143                 heap_swap(h, _c, _j, set_backpointer);                  \
 144         }                                                               \
 145 } while (0)
 146
 147 #define heap_sift_up(h, i, cmp, set_backpointer)                        \
 148 do {                                                                    \
 149         while (i) {                                                     \
 150                 size_t p = (i - 1) / 2;                                 \
 151                 if (cmp(h, (h)->data[i], (h)->data[p]) >= 0)            \
 152                         break;                                          \
 153                 heap_swap(h, i, p, set_backpointer);                    \
 154                 i = p;                                                  \
 155         }                                                               \
 156 } while (0)
 157
 158 #define __heap_add(h, d, cmp, set_backpointer)                          \
 159 ({                                                                      \
 160         size_t _i = (h)->used++;                                        \
 161         (h)->data[_i] = d;                                              \
 162         heap_set_backpointer(h, _i, set_backpointer);                   \
 163                                                                         \
 164         heap_sift_up(h, _i, cmp, set_backpointer);                      \
 165         _i;                                                             \
 166 })
 167
 168 #define heap_add(h, d, cmp, set_backpointer)                            \
 169 ({                                                                      \
 170         bool _r = !heap_full(h);                                        \
 171         if (_r)                                                         \
 172                 __heap_add(h, d, cmp, set_backpointer);                 \
 173         _r;                                                             \
 174 })
 175
 176 #define heap_add_or_replace(h, new, cmp, set_backpointer)               \
 177 do {                                                                    \
 178         if (!heap_add(h, new, cmp, set_backpointer) &&                  \
 179             cmp(h, new, heap_peek(h)) >= 0) {                           \
 180                 (h)->data[0] = new;                                     \
 181                 heap_set_backpointer(h, 0, set_backpointer);            \
 182                 heap_sift_down(h, 0, cmp, set_backpointer);             \
 183         }                                                               \
 184 } while (0)
 185
 186 #define heap_del(h, i, cmp, set_backpointer)                            \
 187 do {                                                                    \
 188         size_t _i = (i);                                                \
 189                                                                         \
 190         BUG_ON(_i >= (h)->used);                                        \
 191         (h)->used--;                                                    \
 192         if ((_i) < (h)->used) {                                         \
 193                 heap_swap(h, _i, (h)->used, set_backpointer);           \
 194                 heap_sift_up(h, _i, cmp, set_backpointer);              \
 195                 heap_sift_down(h, _i, cmp, set_backpointer);            \
 196         }                                                               \
 197 } while (0)
 198
 199 #define heap_pop(h, d, cmp, set_backpointer)                            \
 200 ({                                                                      \
 201         bool _r = (h)->used;                                            \
 202         if (_r) {                                                       \
 203                 (d) = (h)->data[0];                                     \
 204                 heap_del(h, 0, cmp, set_backpointer);                   \
 205         }                                                               \
 206         _r;                                                             \
 207 })
 208
 209 #define heap_resort(heap, cmp, set_backpointer)                         \
 210 do {                                                                    \
 211         ssize_t _i;                                                     \
 212         for (_i = (ssize_t) (heap)->used / 2 -  1; _i >= 0; --_i)       \
 213                 heap_sift_down(heap, _i, cmp, set_backpointer);         \
 214 } while (0)
 215
 216 #define ANYSINT_MAX(t)                                                  \
 217         ((((t) 1 << (sizeof(t) * 8 - 2)) - (t) 1) * (t) 2 + (t) 1)
 218
 219 #include "printbuf.h"
 220
 221 #define prt_vprintf(_out, ...)          bch2_prt_vprintf(_out, __VA_ARGS__)
 222 #define prt_printf(_out, ...)           bch2_prt_printf(_out, __VA_ARGS__)
 223 #define printbuf_str(_buf)              bch2_printbuf_str(_buf)
 224 #define printbuf_exit(_buf)             bch2_printbuf_exit(_buf)
 225
 226 #define printbuf_tabstops_reset(_buf)   bch2_printbuf_tabstops_reset(_buf)
 227 #define printbuf_tabstop_pop(_buf)      bch2_printbuf_tabstop_pop(_buf)
 228 #define printbuf_tabstop_push(_buf, _n) bch2_printbuf_tabstop_push(_buf, _n)
 229
 230 #define printbuf_indent_add(_out, _n)   bch2_printbuf_indent_add(_out, _n)
 231 #define printbuf_indent_sub(_out, _n)   bch2_printbuf_indent_sub(_out, _n)
 232
 233 #define prt_newline(_out)               bch2_prt_newline(_out)
 234 #define prt_tab(_out)                   bch2_prt_tab(_out)
 235 #define prt_tab_rjust(_out)             bch2_prt_tab_rjust(_out)
 236
 237 #define prt_bytes_indented(...)         bch2_prt_bytes_indented(__VA_ARGS__)
 238 #define prt_u64(_out, _v)               prt_printf(_out, "%llu", (u64) (_v))
 239 #define prt_human_readable_u64(...)     bch2_prt_human_readable_u64(__VA_ARGS__)
 240 #define prt_human_readable_s64(...)     bch2_prt_human_readable_s64(__VA_ARGS__)
 241 #define prt_units_u64(...)              bch2_prt_units_u64(__VA_ARGS__)
 242 #define prt_units_s64(...)              bch2_prt_units_s64(__VA_ARGS__)
 243 #define prt_string_option(...)          bch2_prt_string_option(__VA_ARGS__)
 244 #define prt_bitflags(...)               bch2_prt_bitflags(__VA_ARGS__)
 245
 246 void bch2_pr_time_units(struct printbuf *, u64);
 247
 248 #ifdef __KERNEL__
 249 static inline void pr_time(struct printbuf *out, u64 time)
 250 {
 251         prt_printf(out, "%llu", time);
 252 }
 253 #else
 254 #include <time.h>
 255 static inline void pr_time(struct printbuf *out, u64 _time)
 256 {
 257         char time_str[64];
 258         time_t time = _time;
 259         struct tm *tm = localtime(&time);
 260         size_t err = strftime(time_str, sizeof(time_str), "%c", tm);
 261         if (!err)
 262                 prt_printf(out, "(formatting error)");
 263         else
 264                 prt_printf(out, "%s", time_str);
 265 }
 266 #endif
 267
 268 #ifdef __KERNEL__
 269 static inline void uuid_unparse_lower(u8 *uuid, char *out)
 270 {
 271         sprintf(out, "%pUb", uuid);
 272 }
 273 #else
 274 #include <uuid/uuid.h>
 275 #endif
 276
 277 static inline void pr_uuid(struct printbuf *out, u8 *uuid)
 278 {
 279         char uuid_str[40];
 280
 281         uuid_unparse_lower(uuid, uuid_str);
 282         prt_printf(out, "%s", uuid_str);
 283 }
 284
 285 int bch2_strtoint_h(const char *, int *);
 286 int bch2_strtouint_h(const char *, unsigned int *);
 287 int bch2_strtoll_h(const char *, long long *);
 288 int bch2_strtoull_h(const char *, unsigned long long *);
 289 int bch2_strtou64_h(const char *, u64 *);
 290
 291 static inline int bch2_strtol_h(const char *cp, long *res)
 292 {
 293 #if BITS_PER_LONG == 32
 294         return bch2_strtoint_h(cp, (int *) res);
 295 #else
 296         return bch2_strtoll_h(cp, (long long *) res);
 297 #endif
 298 }
 299
 300 static inline int bch2_strtoul_h(const char *cp, long *res)
 301 {
 302 #if BITS_PER_LONG == 32
 303         return bch2_strtouint_h(cp, (unsigned int *) res);
 304 #else
 305         return bch2_strtoull_h(cp, (unsigned long long *) res);
 306 #endif
 307 }
 308
 309 #define strtoi_h(cp, res)                                               \
 310         ( type_is(*res, int)            ? bch2_strtoint_h(cp, (void *) res)\
 311         : type_is(*res, long)           ? bch2_strtol_h(cp, (void *) res)\
 312         : type_is(*res, long long)      ? bch2_strtoll_h(cp, (void *) res)\
 313         : type_is(*res, unsigned)       ? bch2_strtouint_h(cp, (void *) res)\
 314         : type_is(*res, unsigned long)  ? bch2_strtoul_h(cp, (void *) res)\
 315         : type_is(*res, unsigned long long) ? bch2_strtoull_h(cp, (void *) res)\
 316         : -EINVAL)
 317
 318 #define strtoul_safe(cp, var)                                           \
 319 ({                                                                      \
 320         unsigned long _v;                                               \
 321         int _r = kstrtoul(cp, 10, &_v);                                 \
 322         if (!_r)                                                        \
 323                 var = _v;                                               \
 324         _r;                                                             \
 325 })
 326
 327 #define strtoul_safe_clamp(cp, var, min, max)                           \
 328 ({                                                                      \
 329         unsigned long _v;                                               \
 330         int _r = kstrtoul(cp, 10, &_v);                                 \
 331         if (!_r)                                                        \
 332                 var = clamp_t(typeof(var), _v, min, max);               \
 333         _r;                                                             \
 334 })
 335
 336 #define strtoul_safe_restrict(cp, var, min, max)                        \
 337 ({                                                                      \
 338         unsigned long _v;                                               \
 339         int _r = kstrtoul(cp, 10, &_v);                                 \
 340         if (!_r && _v >= min && _v <= max)                              \
 341                 var = _v;                                               \
 342         else                                                            \
 343                 _r = -EINVAL;                                           \
 344         _r;                                                             \
 345 })
 346
 347 #define snprint(out, var)                                               \
 348         prt_printf(out,                                                 \
 349                    type_is(var, int)            ? "%i\n"                \
 350                  : type_is(var, unsigned)       ? "%u\n"                \
 351                  : type_is(var, long)           ? "%li\n"               \
 352                  : type_is(var, unsigned long)  ? "%lu\n"               \
 353                  : type_is(var, s64)            ? "%lli\n"              \
 354                  : type_is(var, u64)            ? "%llu\n"              \
 355                  : type_is(var, char *)         ? "%s\n"                \
 356                  : "%i\n", var)
 357
 358 bool bch2_is_zero(const void *, size_t);
 359
 360 u64 bch2_read_flag_list(char *, const char * const[]);
 361
 362 void bch2_prt_u64_binary(struct printbuf *, u64, unsigned);
 363
 364 void bch2_print_string_as_lines(const char *prefix, const char *lines);
 365
 366 typedef DARRAY(unsigned long) bch_stacktrace;
 367 int bch2_save_backtrace(bch_stacktrace *stack, struct task_struct *);
 368 void bch2_prt_backtrace(struct printbuf *, bch_stacktrace *);
 369 int bch2_prt_task_backtrace(struct printbuf *, struct task_struct *);
 370
 371 #define NR_QUANTILES    15
 372 #define QUANTILE_IDX(i) inorder_to_eytzinger0(i, NR_QUANTILES)
 373 #define QUANTILE_FIRST  eytzinger0_first(NR_QUANTILES)
 374 #define QUANTILE_LAST   eytzinger0_last(NR_QUANTILES)
 375
 376 struct bch2_quantiles {
 377         struct bch2_quantile_entry {
 378                 u64     m;
 379                 u64     step;
 380         }               entries[NR_QUANTILES];
 381 };
 382
 383 struct bch2_time_stat_buffer {
 384         unsigned        nr;
 385         struct bch2_time_stat_buffer_entry {
 386                 u64     start;
 387                 u64     end;
 388         }               entries[32];
 389 };
 390
 391 struct bch2_time_stats {
 392         spinlock_t      lock;
 393         /* all fields are in nanoseconds */
 394         u64             max_duration;
 395         u64             min_duration;
 396         u64             max_freq;
 397         u64             min_freq;
 398         u64             last_event;
 399         struct bch2_quantiles quantiles;
 400
 401         struct mean_and_variance          duration_stats;
 402         struct mean_and_variance_weighted duration_stats_weighted;
 403         struct mean_and_variance          freq_stats;
 404         struct mean_and_variance_weighted freq_stats_weighted;
 405         struct bch2_time_stat_buffer __percpu *buffer;
 406 };
 407
 408 #ifndef CONFIG_BCACHEFS_NO_LATENCY_ACCT
 409 void __bch2_time_stats_update(struct bch2_time_stats *stats, u64, u64);
 410 #else
 411 static inline void __bch2_time_stats_update(struct bch2_time_stats *stats, u64 start, u64 end) {}
 412 #endif
 413
 414 static inline void bch2_time_stats_update(struct bch2_time_stats *stats, u64 start)
 415 {
 416         __bch2_time_stats_update(stats, start, local_clock());
 417 }
 418
 419 void bch2_time_stats_to_text(struct printbuf *, struct bch2_time_stats *);
 420
 421 void bch2_time_stats_exit(struct bch2_time_stats *);
 422 void bch2_time_stats_init(struct bch2_time_stats *);
 423
 424 #define ewma_add(ewma, val, weight)                                     \
 425 ({                                                                      \
 426         typeof(ewma) _ewma = (ewma);                                    \
 427         typeof(weight) _weight = (weight);                              \
 428                                                                         \
 429         (((_ewma << _weight) - _ewma) + (val)) >> _weight;              \
 430 })
 431
 432 struct bch_ratelimit {
 433         /* Next time we want to do some work, in nanoseconds */
 434         u64                     next;
 435
 436         /*
 437          * Rate at which we want to do work, in units per nanosecond
 438          * The units here correspond to the units passed to
 439          * bch2_ratelimit_increment()
 440          */
 441         unsigned                rate;
 442 };
 443
 444 static inline void bch2_ratelimit_reset(struct bch_ratelimit *d)
 445 {
 446         d->next = local_clock();
 447 }
 448
 449 u64 bch2_ratelimit_delay(struct bch_ratelimit *);
 450 void bch2_ratelimit_increment(struct bch_ratelimit *, u64);
 451
 452 struct bch_pd_controller {
 453         struct bch_ratelimit    rate;
 454         unsigned long           last_update;
 455
 456         s64                     last_actual;
 457         s64                     smoothed_derivative;
 458
 459         unsigned                p_term_inverse;
 460         unsigned                d_smooth;
 461         unsigned                d_term;
 462
 463         /* for exporting to sysfs (no effect on behavior) */
 464         s64                     last_derivative;
 465         s64                     last_proportional;
 466         s64                     last_change;
 467         s64                     last_target;
 468
 469         /* If true, the rate will not increase if bch2_ratelimit_delay()
 470          * is not being called often enough. */
 471         bool                    backpressure;
 472 };
 473
 474 void bch2_pd_controller_update(struct bch_pd_controller *, s64, s64, int);
 475 void bch2_pd_controller_init(struct bch_pd_controller *);
 476 void bch2_pd_controller_debug_to_text(struct printbuf *, struct bch_pd_controller *);
 477
 478 #define sysfs_pd_controller_attribute(name)                             \
 479         rw_attribute(name##_rate);                                      \
 480         rw_attribute(name##_rate_bytes);                                \
 481         rw_attribute(name##_rate_d_term);                               \
 482         rw_attribute(name##_rate_p_term_inverse);                       \
 483         read_attribute(name##_rate_debug)
 484
 485 #define sysfs_pd_controller_files(name)                                 \
 486         &sysfs_##name##_rate,                                           \
 487         &sysfs_##name##_rate_bytes,                                     \
 488         &sysfs_##name##_rate_d_term,                                    \
 489         &sysfs_##name##_rate_p_term_inverse,                            \
 490         &sysfs_##name##_rate_debug
 491
 492 #define sysfs_pd_controller_show(name, var)                             \
 493 do {                                                                    \
 494         sysfs_hprint(name##_rate,               (var)->rate.rate);      \
 495         sysfs_print(name##_rate_bytes,          (var)->rate.rate);      \
 496         sysfs_print(name##_rate_d_term,         (var)->d_term);         \
 497         sysfs_print(name##_rate_p_term_inverse, (var)->p_term_inverse); \
 498                                                                         \
 499         if (attr == &sysfs_##name##_rate_debug)                         \
 500                 bch2_pd_controller_debug_to_text(out, var);             \
 501 } while (0)
 502
 503 #define sysfs_pd_controller_store(name, var)                            \
 504 do {                                                                    \
 505         sysfs_strtoul_clamp(name##_rate,                                \
 506                             (var)->rate.rate, 1, UINT_MAX);             \
 507         sysfs_strtoul_clamp(name##_rate_bytes,                          \
 508                             (var)->rate.rate, 1, UINT_MAX);             \
 509         sysfs_strtoul(name##_rate_d_term,       (var)->d_term);         \
 510         sysfs_strtoul_clamp(name##_rate_p_term_inverse,                 \
 511                             (var)->p_term_inverse, 1, INT_MAX);         \
 512 } while (0)
 513
 514 #define container_of_or_null(ptr, type, member)                         \
 515 ({                                                                      \
 516         typeof(ptr) _ptr = ptr;                                         \
 517         _ptr ? container_of(_ptr, type, member) : NULL;                 \
 518 })
 519
 520 /* Does linear interpolation between powers of two */
 521 static inline unsigned fract_exp_two(unsigned x, unsigned fract_bits)
 522 {
 523         unsigned fract = x & ~(~0 << fract_bits);
 524
 525         x >>= fract_bits;
 526         x   = 1 << x;
 527         x  += (x * fract) >> fract_bits;
 528
 529         return x;
 530 }
 531
 532 void bch2_bio_map(struct bio *bio, void *base, size_t);
 533 int bch2_bio_alloc_pages(struct bio *, size_t, gfp_t);
 534
 535 static inline sector_t bdev_sectors(struct block_device *bdev)
 536 {
 537         return bdev->bd_inode->i_size >> 9;
 538 }
 539
 540 #define closure_bio_submit(bio, cl)                                     \
 541 do {                                                                    \
 542         closure_get(cl);                                                \
 543         submit_bio(bio);                                                \
 544 } while (0)
 545
 546 #define kthread_wait(cond)                                              \
 547 ({                                                                      \
 548         int _ret = 0;                                                   \
 549                                                                         \
 550         while (1) {                                                     \
 551                 set_current_state(TASK_INTERRUPTIBLE);                  \
 552                 if (kthread_should_stop()) {                            \
 553                         _ret = -1;                                      \
 554                         break;                                          \
 555                 }                                                       \
 556                                                                         \
 557                 if (cond)                                               \
 558                         break;                                          \
 559                                                                         \
 560                 schedule();                                             \
 561         }                                                               \
 562         set_current_state(TASK_RUNNING);                                \
 563         _ret;                                                           \
 564 })
 565
 566 #define kthread_wait_freezable(cond)                                    \
 567 ({                                                                      \
 568         int _ret = 0;                                                   \
 569         bool frozen;                                                    \
 570                                                                         \
 571         while (1) {                                                     \
 572                 set_current_state(TASK_INTERRUPTIBLE);                  \
 573                 if (kthread_freezable_should_stop(&frozen)) {           \
 574                         _ret = -1;                                      \
 575                         break;                                          \
 576                 }                                                       \
 577                                                                         \
 578                 if (cond)                                               \
 579                         break;                                          \
 580                                                                         \
 581                 schedule();                                             \
 582         }                                                               \
 583         set_current_state(TASK_RUNNING);                                \
 584         _ret;                                                           \
 585 })
 586
 587 size_t bch2_rand_range(size_t);
 588
 589 void memcpy_to_bio(struct bio *, struct bvec_iter, const void *);
 590 void memcpy_from_bio(void *, struct bio *, struct bvec_iter);
 591
 592 static inline void memcpy_u64s_small(void *dst, const void *src,
 593                                      unsigned u64s)
 594 {
 595         u64 *d = dst;
 596         const u64 *s = src;
 597
 598         while (u64s--)
 599                 *d++ = *s++;
 600 }
 601
 602 static inline void __memcpy_u64s(void *dst, const void *src,
 603                                  unsigned u64s)
 604 {
 605 #ifdef CONFIG_X86_64
 606         long d0, d1, d2;
 607         asm volatile("rep ; movsq"
 608                      : "=&c" (d0), "=&D" (d1), "=&S" (d2)
 609                      : "0" (u64s), "1" (dst), "2" (src)
 610                      : "memory");
 611 #else
 612         u64 *d = dst;
 613         const u64 *s = src;
 614
 615         while (u64s--)
 616                 *d++ = *s++;
 617 #endif
 618 }
 619
 620 static inline void memcpy_u64s(void *dst, const void *src,
 621                                unsigned u64s)
 622 {
 623         EBUG_ON(!(dst >= src + u64s * sizeof(u64) ||
 624                  dst + u64s * sizeof(u64) <= src));
 625
 626         __memcpy_u64s(dst, src, u64s);
 627 }
 628
 629 static inline void __memmove_u64s_down(void *dst, const void *src,
 630                                        unsigned u64s)
 631 {
 632         __memcpy_u64s(dst, src, u64s);
 633 }
 634
 635 static inline void memmove_u64s_down(void *dst, const void *src,
 636                                      unsigned u64s)
 637 {
 638         EBUG_ON(dst > src);
 639
 640         __memmove_u64s_down(dst, src, u64s);
 641 }
 642
 643 static inline void __memmove_u64s_down_small(void *dst, const void *src,
 644                                        unsigned u64s)
 645 {
 646         memcpy_u64s_small(dst, src, u64s);
 647 }
 648
 649 static inline void memmove_u64s_down_small(void *dst, const void *src,
 650                                      unsigned u64s)
 651 {
 652         EBUG_ON(dst > src);
 653
 654         __memmove_u64s_down_small(dst, src, u64s);
 655 }
 656
 657 static inline void __memmove_u64s_up_small(void *_dst, const void *_src,
 658                                            unsigned u64s)
 659 {
 660         u64 *dst = (u64 *) _dst + u64s;
 661         u64 *src = (u64 *) _src + u64s;
 662
 663         while (u64s--)
 664                 *--dst = *--src;
 665 }
 666
 667 static inline void memmove_u64s_up_small(void *dst, const void *src,
 668                                          unsigned u64s)
 669 {
 670         EBUG_ON(dst < src);
 671
 672         __memmove_u64s_up_small(dst, src, u64s);
 673 }
 674
 675 static inline void __memmove_u64s_up(void *_dst, const void *_src,
 676                                      unsigned u64s)
 677 {
 678         u64 *dst = (u64 *) _dst + u64s - 1;
 679         u64 *src = (u64 *) _src + u64s - 1;
 680
 681 #ifdef CONFIG_X86_64
 682         long d0, d1, d2;
 683         asm volatile("std ;\n"
 684                      "rep ; movsq\n"
 685                      "cld ;\n"
 686                      : "=&c" (d0), "=&D" (d1), "=&S" (d2)
 687                      : "0" (u64s), "1" (dst), "2" (src)
 688                      : "memory");
 689 #else
 690         while (u64s--)
 691                 *dst-- = *src--;
 692 #endif
 693 }
 694
 695 static inline void memmove_u64s_up(void *dst, const void *src,
 696                                    unsigned u64s)
 697 {
 698         EBUG_ON(dst < src);
 699
 700         __memmove_u64s_up(dst, src, u64s);
 701 }
 702
 703 static inline void memmove_u64s(void *dst, const void *src,
 704                                 unsigned u64s)
 705 {
 706         if (dst < src)
 707                 __memmove_u64s_down(dst, src, u64s);
 708         else
 709                 __memmove_u64s_up(dst, src, u64s);
 710 }
 711
 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)
 714 {
 715         unsigned rem = round_up(bytes, sizeof(u64)) - bytes;
 716
 717         memset(s + bytes, c, rem);
 718 }
 719
 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));
 723
 724 /* just the memmove, doesn't update @_nr */
 725 #define __array_insert_item(_array, _nr, _pos)                          \
 726         memmove(&(_array)[(_pos) + 1],                                  \
 727                 &(_array)[(_pos)],                                      \
 728                 sizeof((_array)[0]) * ((_nr) - (_pos)))
 729
 730 #define array_insert_item(_array, _nr, _pos, _new_item)                 \
 731 do {                                                                    \
 732         __array_insert_item(_array, _nr, _pos);                         \
 733         (_nr)++;                                                        \
 734         (_array)[(_pos)] = (_new_item);                                 \
 735 } while (0)
 736
 737 #define array_remove_items(_array, _nr, _pos, _nr_to_remove)            \
 738 do {                                                                    \
 739         (_nr) -= (_nr_to_remove);                                       \
 740         memmove(&(_array)[(_pos)],                                      \
 741                 &(_array)[(_pos) + (_nr_to_remove)],                    \
 742                 sizeof((_array)[0]) * ((_nr) - (_pos)));                \
 743 } while (0)
 744
 745 #define array_remove_item(_array, _nr, _pos)                            \
 746         array_remove_items(_array, _nr, _pos, 1)
 747
 748 static inline void __move_gap(void *array, size_t element_size,
 749                               size_t nr, size_t size,
 750                               size_t old_gap, size_t new_gap)
 751 {
 752         size_t gap_end = old_gap + size - nr;
 753
 754         if (new_gap < old_gap) {
 755                 size_t move = old_gap - new_gap;
 756
 757                 memmove(array + element_size * (gap_end - move),
 758                         array + element_size * (old_gap - move),
 759                                 element_size * move);
 760         } else if (new_gap > old_gap) {
 761                 size_t move = new_gap - old_gap;
 762
 763                 memmove(array + element_size * old_gap,
 764                         array + element_size * gap_end,
 765                                 element_size * move);
 766         }
 767 }
 768
 769 /* Move the gap in a gap buffer: */
 770 #define move_gap(_array, _nr, _size, _old_gap, _new_gap)        \
 771         __move_gap(_array, sizeof(_array[0]), _nr, _size, _old_gap, _new_gap)
 772
 773 #define bubble_sort(_base, _nr, _cmp)                                   \
 774 do {                                                                    \
 775         ssize_t _i, _end;                                               \
 776         bool _swapped = true;                                           \
 777                                                                         \
 778         for (_end = (ssize_t) (_nr) - 1; _end > 0 && _swapped; --_end) {\
 779                 _swapped = false;                                       \
 780                 for (_i = 0; _i < _end; _i++)                           \
 781                         if (_cmp((_base)[_i], (_base)[_i + 1]) > 0) {   \
 782                                 swap((_base)[_i], (_base)[_i + 1]);     \
 783                                 _swapped = true;                        \
 784                         }                                               \
 785         }                                                               \
 786 } while (0)
 787
 788 static inline u64 percpu_u64_get(u64 __percpu *src)
 789 {
 790         u64 ret = 0;
 791         int cpu;
 792
 793         for_each_possible_cpu(cpu)
 794                 ret += *per_cpu_ptr(src, cpu);
 795         return ret;
 796 }
 797
 798 static inline void percpu_u64_set(u64 __percpu *dst, u64 src)
 799 {
 800         int cpu;
 801
 802         for_each_possible_cpu(cpu)
 803                 *per_cpu_ptr(dst, cpu) = 0;
 804         this_cpu_write(*dst, src);
 805 }
 806
 807 static inline void acc_u64s(u64 *acc, const u64 *src, unsigned nr)
 808 {
 809         unsigned i;
 810
 811         for (i = 0; i < nr; i++)
 812                 acc[i] += src[i];
 813 }
 814
 815 static inline void acc_u64s_percpu(u64 *acc, const u64 __percpu *src,
 816                                    unsigned nr)
 817 {
 818         int cpu;
 819
 820         for_each_possible_cpu(cpu)
 821                 acc_u64s(acc, per_cpu_ptr(src, cpu), nr);
 822 }
 823
 824 static inline void percpu_memset(void __percpu *p, int c, size_t bytes)
 825 {
 826         int cpu;
 827
 828         for_each_possible_cpu(cpu)
 829                 memset(per_cpu_ptr(p, cpu), c, bytes);
 830 }
 831
 832 u64 *bch2_acc_percpu_u64s(u64 __percpu *, unsigned);
 833
 834 #define cmp_int(l, r)           ((l > r) - (l < r))
 835
 836 static inline int u8_cmp(u8 l, u8 r)
 837 {
 838         return cmp_int(l, r);
 839 }
 840
 841 #endif /* _BCACHEFS_UTIL_H */