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 #define PAGE_SECTOR_SHIFT       (PAGE_SHIFT - 9)
  22 #define PAGE_SECTORS            (1UL << PAGE_SECTOR_SHIFT)
  23
  24 struct closure;
  25
  26 #ifdef CONFIG_BCACHEFS_DEBUG
  27
  28 #define EBUG_ON(cond)           BUG_ON(cond)
  29 #define atomic_dec_bug(v)       BUG_ON(atomic_dec_return(v) < 0)
  30 #define atomic_inc_bug(v, i)    BUG_ON(atomic_inc_return(v) <= i)
  31 #define atomic_sub_bug(i, v)    BUG_ON(atomic_sub_return(i, v) < 0)
  32 #define atomic_add_bug(i, v)    BUG_ON(atomic_add_return(i, v) < 0)
  33 #define atomic_long_dec_bug(v)          BUG_ON(atomic_long_dec_return(v) < 0)
  34 #define atomic_long_sub_bug(i, v)       BUG_ON(atomic_long_sub_return(i, v) < 0)
  35 #define atomic64_dec_bug(v)     BUG_ON(atomic64_dec_return(v) < 0)
  36 #define atomic64_inc_bug(v, i)  BUG_ON(atomic64_inc_return(v) <= i)
  37 #define atomic64_sub_bug(i, v)  BUG_ON(atomic64_sub_return(i, v) < 0)
  38 #define atomic64_add_bug(i, v)  BUG_ON(atomic64_add_return(i, v) < 0)
  39
  40 #define memcpy(dst, src, len)                                           \
  41 ({                                                                      \
  42         void *_dst = (dst);                                             \
  43         const void *_src = (src);                                       \
  44         size_t _len = (len);                                            \
  45                                                                         \
  46         BUG_ON(!((void *) (_dst) >= (void *) (_src) + (_len) ||         \
  47                  (void *) (_dst) + (_len) <= (void *) (_src)));         \
  48         memcpy(_dst, _src, _len);                                       \
  49 })
  50
  51 #else /* DEBUG */
  52
  53 #define EBUG_ON(cond)
  54 #define atomic_dec_bug(v)       atomic_dec(v)
  55 #define atomic_inc_bug(v, i)    atomic_inc(v)
  56 #define atomic_sub_bug(i, v)    atomic_sub(i, v)
  57 #define atomic_add_bug(i, v)    atomic_add(i, v)
  58 #define atomic_long_dec_bug(v)          atomic_long_dec(v)
  59 #define atomic_long_sub_bug(i, v)       atomic_long_sub(i, v)
  60 #define atomic64_dec_bug(v)     atomic64_dec(v)
  61 #define atomic64_inc_bug(v, i)  atomic64_inc(v)
  62 #define atomic64_sub_bug(i, v)  atomic64_sub(i, v)
  63 #define atomic64_add_bug(i, v)  atomic64_add(i, v)
  64
  65 #endif
  66
  67 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
  68 #define CPU_BIG_ENDIAN          0
  69 #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
  70 #define CPU_BIG_ENDIAN          1
  71 #endif
  72
  73 /* type hackery */
  74
  75 #define type_is_exact(_val, _type)                                      \
  76         __builtin_types_compatible_p(typeof(_val), _type)
  77
  78 #define type_is(_val, _type)                                            \
  79         (__builtin_types_compatible_p(typeof(_val), _type) ||           \
  80          __builtin_types_compatible_p(typeof(_val), const _type))
  81
  82 /* Userspace doesn't align allocations as nicely as the kernel allocators: */
  83 static inline size_t buf_pages(void *p, size_t len)
  84 {
  85         return DIV_ROUND_UP(len +
  86                             ((unsigned long) p & (PAGE_SIZE - 1)),
  87                             PAGE_SIZE);
  88 }
  89
  90 static inline void vpfree(void *p, size_t size)
  91 {
  92         if (is_vmalloc_addr(p))
  93                 vfree(p);
  94         else
  95                 free_pages((unsigned long) p, get_order(size));
  96 }
  97
  98 static inline void *vpmalloc(size_t size, gfp_t gfp_mask)
  99 {
 100         return (void *) __get_free_pages(gfp_mask|__GFP_NOWARN,
 101                                          get_order(size)) ?:
 102                 __vmalloc(size, gfp_mask);
 103 }
 104
 105 static inline void kvpfree(void *p, size_t size)
 106 {
 107         if (size < PAGE_SIZE)
 108                 kfree(p);
 109         else
 110                 vpfree(p, size);
 111 }
 112
 113 static inline void *kvpmalloc(size_t size, gfp_t gfp_mask)
 114 {
 115         return size < PAGE_SIZE
 116                 ? kmalloc(size, gfp_mask)
 117                 : vpmalloc(size, gfp_mask);
 118 }
 119
 120 int mempool_init_kvpmalloc_pool(mempool_t *, int, size_t);
 121
 122 #define HEAP(type)                                                      \
 123 struct {                                                                \
 124         size_t size, used;                                              \
 125         type *data;                                                     \
 126 }
 127
 128 #define DECLARE_HEAP(type, name) HEAP(type) name
 129
 130 #define init_heap(heap, _size, gfp)                                     \
 131 ({                                                                      \
 132         (heap)->used = 0;                                               \
 133         (heap)->size = (_size);                                         \
 134         (heap)->data = kvpmalloc((heap)->size * sizeof((heap)->data[0]),\
 135                                  (gfp));                                \
 136 })
 137
 138 #define free_heap(heap)                                                 \
 139 do {                                                                    \
 140         kvpfree((heap)->data, (heap)->size * sizeof((heap)->data[0]));  \
 141         (heap)->data = NULL;                                            \
 142 } while (0)
 143
 144 #define heap_set_backpointer(h, i, _fn)                                 \
 145 do {                                                                    \
 146         void (*fn)(typeof(h), size_t) = _fn;                            \
 147         if (fn)                                                         \
 148                 fn(h, i);                                               \
 149 } while (0)
 150
 151 #define heap_swap(h, i, j, set_backpointer)                             \
 152 do {                                                                    \
 153         swap((h)->data[i], (h)->data[j]);                               \
 154         heap_set_backpointer(h, i, set_backpointer);                    \
 155         heap_set_backpointer(h, j, set_backpointer);                    \
 156 } while (0)
 157
 158 #define heap_peek(h)                                                    \
 159 ({                                                                      \
 160         EBUG_ON(!(h)->used);                                            \
 161         (h)->data[0];                                                   \
 162 })
 163
 164 #define heap_full(h)    ((h)->used == (h)->size)
 165
 166 #define heap_sift_down(h, i, cmp, set_backpointer)                      \
 167 do {                                                                    \
 168         size_t _c, _j = i;                                              \
 169                                                                         \
 170         for (; _j * 2 + 1 < (h)->used; _j = _c) {                       \
 171                 _c = _j * 2 + 1;                                        \
 172                 if (_c + 1 < (h)->used &&                               \
 173                     cmp(h, (h)->data[_c], (h)->data[_c + 1]) >= 0)      \
 174                         _c++;                                           \
 175                                                                         \
 176                 if (cmp(h, (h)->data[_c], (h)->data[_j]) >= 0)          \
 177                         break;                                          \
 178                 heap_swap(h, _c, _j, set_backpointer);                  \
 179         }                                                               \
 180 } while (0)
 181
 182 #define heap_sift_up(h, i, cmp, set_backpointer)                        \
 183 do {                                                                    \
 184         while (i) {                                                     \
 185                 size_t p = (i - 1) / 2;                                 \
 186                 if (cmp(h, (h)->data[i], (h)->data[p]) >= 0)            \
 187                         break;                                          \
 188                 heap_swap(h, i, p, set_backpointer);                    \
 189                 i = p;                                                  \
 190         }                                                               \
 191 } while (0)
 192
 193 #define __heap_add(h, d, cmp, set_backpointer)                          \
 194 ({                                                                      \
 195         size_t _i = (h)->used++;                                        \
 196         (h)->data[_i] = d;                                              \
 197         heap_set_backpointer(h, _i, set_backpointer);                   \
 198                                                                         \
 199         heap_sift_up(h, _i, cmp, set_backpointer);                      \
 200         _i;                                                             \
 201 })
 202
 203 #define heap_add(h, d, cmp, set_backpointer)                            \
 204 ({                                                                      \
 205         bool _r = !heap_full(h);                                        \
 206         if (_r)                                                         \
 207                 __heap_add(h, d, cmp, set_backpointer);                 \
 208         _r;                                                             \
 209 })
 210
 211 #define heap_add_or_replace(h, new, cmp, set_backpointer)               \
 212 do {                                                                    \
 213         if (!heap_add(h, new, cmp, set_backpointer) &&                  \
 214             cmp(h, new, heap_peek(h)) >= 0) {                           \
 215                 (h)->data[0] = new;                                     \
 216                 heap_set_backpointer(h, 0, set_backpointer);            \
 217                 heap_sift_down(h, 0, cmp, set_backpointer);             \
 218         }                                                               \
 219 } while (0)
 220
 221 #define heap_del(h, i, cmp, set_backpointer)                            \
 222 do {                                                                    \
 223         size_t _i = (i);                                                \
 224                                                                         \
 225         BUG_ON(_i >= (h)->used);                                        \
 226         (h)->used--;                                                    \
 227         heap_swap(h, _i, (h)->used, set_backpointer);                   \
 228         heap_sift_up(h, _i, cmp, set_backpointer);                      \
 229         heap_sift_down(h, _i, cmp, set_backpointer);                    \
 230 } while (0)
 231
 232 #define heap_pop(h, d, cmp, set_backpointer)                            \
 233 ({                                                                      \
 234         bool _r = (h)->used;                                            \
 235         if (_r) {                                                       \
 236                 (d) = (h)->data[0];                                     \
 237                 heap_del(h, 0, cmp, set_backpointer);                   \
 238         }                                                               \
 239         _r;                                                             \
 240 })
 241
 242 #define heap_resort(heap, cmp, set_backpointer)                         \
 243 do {                                                                    \
 244         ssize_t _i;                                                     \
 245         for (_i = (ssize_t) (heap)->used / 2 -  1; _i >= 0; --_i)       \
 246                 heap_sift_down(heap, _i, cmp, set_backpointer);         \
 247 } while (0)
 248
 249 #define ANYSINT_MAX(t)                                                  \
 250         ((((t) 1 << (sizeof(t) * 8 - 2)) - (t) 1) * (t) 2 + (t) 1)
 251
 252 struct printbuf {
 253         char            *pos;
 254         char            *end;
 255 };
 256
 257 static inline size_t printbuf_remaining(struct printbuf *buf)
 258 {
 259         return buf->end - buf->pos;
 260 }
 261
 262 #define _PBUF(_buf, _len)                                               \
 263         ((struct printbuf) {                                            \
 264                 .pos    = _buf,                                         \
 265                 .end    = _buf + _len,                                  \
 266         })
 267
 268 #define PBUF(_buf) _PBUF(_buf, sizeof(_buf))
 269
 270 #define pr_buf(_out, ...)                                               \
 271 do {                                                                    \
 272         (_out)->pos += scnprintf((_out)->pos, printbuf_remaining(_out), \
 273                                  __VA_ARGS__);                          \
 274 } while (0)
 275
 276 void bch_scnmemcpy(struct printbuf *, const char *, size_t);
 277
 278 int bch2_strtoint_h(const char *, int *);
 279 int bch2_strtouint_h(const char *, unsigned int *);
 280 int bch2_strtoll_h(const char *, long long *);
 281 int bch2_strtoull_h(const char *, unsigned long long *);
 282 int bch2_strtou64_h(const char *, u64 *);
 283
 284 static inline int bch2_strtol_h(const char *cp, long *res)
 285 {
 286 #if BITS_PER_LONG == 32
 287         return bch2_strtoint_h(cp, (int *) res);
 288 #else
 289         return bch2_strtoll_h(cp, (long long *) res);
 290 #endif
 291 }
 292
 293 static inline int bch2_strtoul_h(const char *cp, long *res)
 294 {
 295 #if BITS_PER_LONG == 32
 296         return bch2_strtouint_h(cp, (unsigned int *) res);
 297 #else
 298         return bch2_strtoull_h(cp, (unsigned long long *) res);
 299 #endif
 300 }
 301
 302 #define strtoi_h(cp, res)                                               \
 303         ( type_is(*res, int)            ? bch2_strtoint_h(cp, (void *) res)\
 304         : type_is(*res, long)           ? bch2_strtol_h(cp, (void *) res)\
 305         : type_is(*res, long long)      ? bch2_strtoll_h(cp, (void *) res)\
 306         : type_is(*res, unsigned)       ? bch2_strtouint_h(cp, (void *) res)\
 307         : type_is(*res, unsigned long)  ? bch2_strtoul_h(cp, (void *) res)\
 308         : type_is(*res, unsigned long long) ? bch2_strtoull_h(cp, (void *) res)\
 309         : -EINVAL)
 310
 311 #define strtoul_safe(cp, var)                                           \
 312 ({                                                                      \
 313         unsigned long _v;                                               \
 314         int _r = kstrtoul(cp, 10, &_v);                                 \
 315         if (!_r)                                                        \
 316                 var = _v;                                               \
 317         _r;                                                             \
 318 })
 319
 320 #define strtoul_safe_clamp(cp, var, min, max)                           \
 321 ({                                                                      \
 322         unsigned long _v;                                               \
 323         int _r = kstrtoul(cp, 10, &_v);                                 \
 324         if (!_r)                                                        \
 325                 var = clamp_t(typeof(var), _v, min, max);               \
 326         _r;                                                             \
 327 })
 328
 329 #define strtoul_safe_restrict(cp, var, min, max)                        \
 330 ({                                                                      \
 331         unsigned long _v;                                               \
 332         int _r = kstrtoul(cp, 10, &_v);                                 \
 333         if (!_r && _v >= min && _v <= max)                              \
 334                 var = _v;                                               \
 335         else                                                            \
 336                 _r = -EINVAL;                                           \
 337         _r;                                                             \
 338 })
 339
 340 #define snprint(buf, size, var)                                         \
 341         snprintf(buf, size,                                             \
 342                    type_is(var, int)            ? "%i\n"                \
 343                  : type_is(var, unsigned)       ? "%u\n"                \
 344                  : type_is(var, long)           ? "%li\n"               \
 345                  : type_is(var, unsigned long)  ? "%lu\n"               \
 346                  : type_is(var, s64)            ? "%lli\n"              \
 347                  : type_is(var, u64)            ? "%llu\n"              \
 348                  : type_is(var, char *)         ? "%s\n"                \
 349                  : "%i\n", var)
 350
 351 void bch2_hprint(struct printbuf *, s64);
 352
 353 bool bch2_is_zero(const void *, size_t);
 354
 355 void bch2_string_opt_to_text(struct printbuf *,
 356                              const char * const [], size_t);
 357
 358 void bch2_flags_to_text(struct printbuf *, const char * const[], u64);
 359 u64 bch2_read_flag_list(char *, const char * const[]);
 360
 361 #define NR_QUANTILES    15
 362 #define QUANTILE_IDX(i) inorder_to_eytzinger0(i, NR_QUANTILES)
 363 #define QUANTILE_FIRST  eytzinger0_first(NR_QUANTILES)
 364 #define QUANTILE_LAST   eytzinger0_last(NR_QUANTILES)
 365
 366 struct quantiles {
 367         struct quantile_entry {
 368                 u64     m;
 369                 u64     step;
 370         }               entries[NR_QUANTILES];
 371 };
 372
 373 struct time_stat_buffer {
 374         unsigned        nr;
 375         struct time_stat_buffer_entry {
 376                 u64     start;
 377                 u64     end;
 378         }               entries[32];
 379 };
 380
 381 struct time_stats {
 382         spinlock_t      lock;
 383         u64             count;
 384         /* all fields are in nanoseconds */
 385         u64             average_duration;
 386         u64             average_frequency;
 387         u64             max_duration;
 388         u64             last_event;
 389         struct quantiles quantiles;
 390
 391         struct time_stat_buffer __percpu *buffer;
 392 };
 393
 394 void __bch2_time_stats_update(struct time_stats *stats, u64, u64);
 395
 396 static inline void bch2_time_stats_update(struct time_stats *stats, u64 start)
 397 {
 398         __bch2_time_stats_update(stats, start, local_clock());
 399 }
 400
 401 void bch2_time_stats_to_text(struct printbuf *, struct time_stats *);
 402
 403 void bch2_time_stats_exit(struct time_stats *);
 404 void bch2_time_stats_init(struct time_stats *);
 405
 406 #define ewma_add(ewma, val, weight)                                     \
 407 ({                                                                      \
 408         typeof(ewma) _ewma = (ewma);                                    \
 409         typeof(weight) _weight = (weight);                              \
 410                                                                         \
 411         (((_ewma << _weight) - _ewma) + (val)) >> _weight;              \
 412 })
 413
 414 struct bch_ratelimit {
 415         /* Next time we want to do some work, in nanoseconds */
 416         u64                     next;
 417
 418         /*
 419          * Rate at which we want to do work, in units per nanosecond
 420          * The units here correspond to the units passed to
 421          * bch2_ratelimit_increment()
 422          */
 423         unsigned                rate;
 424 };
 425
 426 static inline void bch2_ratelimit_reset(struct bch_ratelimit *d)
 427 {
 428         d->next = local_clock();
 429 }
 430
 431 u64 bch2_ratelimit_delay(struct bch_ratelimit *);
 432 void bch2_ratelimit_increment(struct bch_ratelimit *, u64);
 433
 434 struct bch_pd_controller {
 435         struct bch_ratelimit    rate;
 436         unsigned long           last_update;
 437
 438         s64                     last_actual;
 439         s64                     smoothed_derivative;
 440
 441         unsigned                p_term_inverse;
 442         unsigned                d_smooth;
 443         unsigned                d_term;
 444
 445         /* for exporting to sysfs (no effect on behavior) */
 446         s64                     last_derivative;
 447         s64                     last_proportional;
 448         s64                     last_change;
 449         s64                     last_target;
 450
 451         /* If true, the rate will not increase if bch2_ratelimit_delay()
 452          * is not being called often enough. */
 453         bool                    backpressure;
 454 };
 455
 456 void bch2_pd_controller_update(struct bch_pd_controller *, s64, s64, int);
 457 void bch2_pd_controller_init(struct bch_pd_controller *);
 458 size_t bch2_pd_controller_print_debug(struct bch_pd_controller *, char *);
 459
 460 #define sysfs_pd_controller_attribute(name)                             \
 461         rw_attribute(name##_rate);                                      \
 462         rw_attribute(name##_rate_bytes);                                \
 463         rw_attribute(name##_rate_d_term);                               \
 464         rw_attribute(name##_rate_p_term_inverse);                       \
 465         read_attribute(name##_rate_debug)
 466
 467 #define sysfs_pd_controller_files(name)                                 \
 468         &sysfs_##name##_rate,                                           \
 469         &sysfs_##name##_rate_bytes,                                     \
 470         &sysfs_##name##_rate_d_term,                                    \
 471         &sysfs_##name##_rate_p_term_inverse,                            \
 472         &sysfs_##name##_rate_debug
 473
 474 #define sysfs_pd_controller_show(name, var)                             \
 475 do {                                                                    \
 476         sysfs_hprint(name##_rate,               (var)->rate.rate);      \
 477         sysfs_print(name##_rate_bytes,          (var)->rate.rate);      \
 478         sysfs_print(name##_rate_d_term,         (var)->d_term);         \
 479         sysfs_print(name##_rate_p_term_inverse, (var)->p_term_inverse); \
 480                                                                         \
 481         if (attr == &sysfs_##name##_rate_debug)                         \
 482                 return bch2_pd_controller_print_debug(var, buf);                \
 483 } while (0)
 484
 485 #define sysfs_pd_controller_store(name, var)                            \
 486 do {                                                                    \
 487         sysfs_strtoul_clamp(name##_rate,                                \
 488                             (var)->rate.rate, 1, UINT_MAX);             \
 489         sysfs_strtoul_clamp(name##_rate_bytes,                          \
 490                             (var)->rate.rate, 1, UINT_MAX);             \
 491         sysfs_strtoul(name##_rate_d_term,       (var)->d_term);         \
 492         sysfs_strtoul_clamp(name##_rate_p_term_inverse,                 \
 493                             (var)->p_term_inverse, 1, INT_MAX);         \
 494 } while (0)
 495
 496 #define container_of_or_null(ptr, type, member)                         \
 497 ({                                                                      \
 498         typeof(ptr) _ptr = ptr;                                         \
 499         _ptr ? container_of(_ptr, type, member) : NULL;                 \
 500 })
 501
 502 /* Does linear interpolation between powers of two */
 503 static inline unsigned fract_exp_two(unsigned x, unsigned fract_bits)
 504 {
 505         unsigned fract = x & ~(~0 << fract_bits);
 506
 507         x >>= fract_bits;
 508         x   = 1 << x;
 509         x  += (x * fract) >> fract_bits;
 510
 511         return x;
 512 }
 513
 514 void bch2_bio_map(struct bio *bio, void *base, size_t);
 515 int bch2_bio_alloc_pages(struct bio *, size_t, gfp_t);
 516
 517 static inline sector_t bdev_sectors(struct block_device *bdev)
 518 {
 519         return bdev->bd_inode->i_size >> 9;
 520 }
 521
 522 #define closure_bio_submit(bio, cl)                                     \
 523 do {                                                                    \
 524         closure_get(cl);                                                \
 525         submit_bio(bio);                                                \
 526 } while (0)
 527
 528 #define kthread_wait_freezable(cond)                                    \
 529 ({                                                                      \
 530         int _ret = 0;                                                   \
 531         while (1) {                                                     \
 532                 set_current_state(TASK_INTERRUPTIBLE);                  \
 533                 if (kthread_should_stop()) {                            \
 534                         _ret = -1;                                      \
 535                         break;                                          \
 536                 }                                                       \
 537                                                                         \
 538                 if (cond)                                               \
 539                         break;                                          \
 540                                                                         \
 541                 schedule();                                             \
 542                 try_to_freeze();                                        \
 543         }                                                               \
 544         set_current_state(TASK_RUNNING);                                \
 545         _ret;                                                           \
 546 })
 547
 548 size_t bch2_rand_range(size_t);
 549
 550 void memcpy_to_bio(struct bio *, struct bvec_iter, const void *);
 551 void memcpy_from_bio(void *, struct bio *, struct bvec_iter);
 552
 553 static inline void memcpy_u64s_small(void *dst, const void *src,
 554                                      unsigned u64s)
 555 {
 556         u64 *d = dst;
 557         const u64 *s = src;
 558
 559         while (u64s--)
 560                 *d++ = *s++;
 561 }
 562
 563 static inline void __memcpy_u64s(void *dst, const void *src,
 564                                  unsigned u64s)
 565 {
 566 #ifdef CONFIG_X86_64
 567         long d0, d1, d2;
 568         asm volatile("rep ; movsq"
 569                      : "=&c" (d0), "=&D" (d1), "=&S" (d2)
 570                      : "0" (u64s), "1" (dst), "2" (src)
 571                      : "memory");
 572 #else
 573         u64 *d = dst;
 574         const u64 *s = src;
 575
 576         while (u64s--)
 577                 *d++ = *s++;
 578 #endif
 579 }
 580
 581 static inline void memcpy_u64s(void *dst, const void *src,
 582                                unsigned u64s)
 583 {
 584         EBUG_ON(!(dst >= src + u64s * sizeof(u64) ||
 585                  dst + u64s * sizeof(u64) <= src));
 586
 587         __memcpy_u64s(dst, src, u64s);
 588 }
 589
 590 static inline void __memmove_u64s_down(void *dst, const void *src,
 591                                        unsigned u64s)
 592 {
 593         __memcpy_u64s(dst, src, u64s);
 594 }
 595
 596 static inline void memmove_u64s_down(void *dst, const void *src,
 597                                      unsigned u64s)
 598 {
 599         EBUG_ON(dst > src);
 600
 601         __memmove_u64s_down(dst, src, u64s);
 602 }
 603
 604 static inline void __memmove_u64s_up_small(void *_dst, const void *_src,
 605                                            unsigned u64s)
 606 {
 607         u64 *dst = (u64 *) _dst + u64s;
 608         u64 *src = (u64 *) _src + u64s;
 609
 610         while (u64s--)
 611                 *--dst = *--src;
 612 }
 613
 614 static inline void memmove_u64s_up_small(void *dst, const void *src,
 615                                          unsigned u64s)
 616 {
 617         EBUG_ON(dst < src);
 618
 619         __memmove_u64s_up_small(dst, src, u64s);
 620 }
 621
 622 static inline void __memmove_u64s_up(void *_dst, const void *_src,
 623                                      unsigned u64s)
 624 {
 625         u64 *dst = (u64 *) _dst + u64s - 1;
 626         u64 *src = (u64 *) _src + u64s - 1;
 627
 628 #ifdef CONFIG_X86_64
 629         long d0, d1, d2;
 630         asm volatile("std ;\n"
 631                      "rep ; movsq\n"
 632                      "cld ;\n"
 633                      : "=&c" (d0), "=&D" (d1), "=&S" (d2)
 634                      : "0" (u64s), "1" (dst), "2" (src)
 635                      : "memory");
 636 #else
 637         while (u64s--)
 638                 *dst-- = *src--;
 639 #endif
 640 }
 641
 642 static inline void memmove_u64s_up(void *dst, const void *src,
 643                                    unsigned u64s)
 644 {
 645         EBUG_ON(dst < src);
 646
 647         __memmove_u64s_up(dst, src, u64s);
 648 }
 649
 650 static inline void memmove_u64s(void *dst, const void *src,
 651                                 unsigned u64s)
 652 {
 653         if (dst < src)
 654                 __memmove_u64s_down(dst, src, u64s);
 655         else
 656                 __memmove_u64s_up(dst, src, u64s);
 657 }
 658
 659 /* Set the last few bytes up to a u64 boundary given an offset into a buffer. */
 660 static inline void memset_u64s_tail(void *s, int c, unsigned bytes)
 661 {
 662         unsigned rem = round_up(bytes, sizeof(u64)) - bytes;
 663
 664         memset(s + bytes, c, rem);
 665 }
 666
 667 void sort_cmp_size(void *base, size_t num, size_t size,
 668           int (*cmp_func)(const void *, const void *, size_t),
 669           void (*swap_func)(void *, void *, size_t));
 670
 671 /* just the memmove, doesn't update @_nr */
 672 #define __array_insert_item(_array, _nr, _pos)                          \
 673         memmove(&(_array)[(_pos) + 1],                                  \
 674                 &(_array)[(_pos)],                                      \
 675                 sizeof((_array)[0]) * ((_nr) - (_pos)))
 676
 677 #define array_insert_item(_array, _nr, _pos, _new_item)                 \
 678 do {                                                                    \
 679         __array_insert_item(_array, _nr, _pos);                         \
 680         (_nr)++;                                                        \
 681         (_array)[(_pos)] = (_new_item);                                 \
 682 } while (0)
 683
 684 #define array_remove_items(_array, _nr, _pos, _nr_to_remove)            \
 685 do {                                                                    \
 686         (_nr) -= (_nr_to_remove);                                       \
 687         memmove(&(_array)[(_pos)],                                      \
 688                 &(_array)[(_pos) + (_nr_to_remove)],                    \
 689                 sizeof((_array)[0]) * ((_nr) - (_pos)));                \
 690 } while (0)
 691
 692 #define array_remove_item(_array, _nr, _pos)                            \
 693         array_remove_items(_array, _nr, _pos, 1)
 694
 695 #define bubble_sort(_base, _nr, _cmp)                                   \
 696 do {                                                                    \
 697         ssize_t _i, _end;                                               \
 698         bool _swapped = true;                                           \
 699                                                                         \
 700         for (_end = (ssize_t) (_nr) - 1; _end > 0 && _swapped; --_end) {\
 701                 _swapped = false;                                       \
 702                 for (_i = 0; _i < _end; _i++)                           \
 703                         if (_cmp((_base)[_i], (_base)[_i + 1]) > 0) {   \
 704                                 swap((_base)[_i], (_base)[_i + 1]);     \
 705                                 _swapped = true;                        \
 706                         }                                               \
 707         }                                                               \
 708 } while (0)
 709
 710 static inline u64 percpu_u64_get(u64 __percpu *src)
 711 {
 712         u64 ret = 0;
 713         int cpu;
 714
 715         for_each_possible_cpu(cpu)
 716                 ret += *per_cpu_ptr(src, cpu);
 717         return ret;
 718 }
 719
 720 static inline void percpu_u64_set(u64 __percpu *dst, u64 src)
 721 {
 722         int cpu;
 723
 724         for_each_possible_cpu(cpu)
 725                 *per_cpu_ptr(dst, cpu) = 0;
 726
 727         preempt_disable();
 728         *this_cpu_ptr(dst) = src;
 729         preempt_enable();
 730 }
 731
 732 static inline void acc_u64s(u64 *acc, const u64 *src, unsigned nr)
 733 {
 734         unsigned i;
 735
 736         for (i = 0; i < nr; i++)
 737                 acc[i] += src[i];
 738 }
 739
 740 static inline void acc_u64s_percpu(u64 *acc, const u64 __percpu *src,
 741                                    unsigned nr)
 742 {
 743         int cpu;
 744
 745         for_each_possible_cpu(cpu)
 746                 acc_u64s(acc, per_cpu_ptr(src, cpu), nr);
 747 }
 748
 749 static inline void percpu_memset(void __percpu *p, int c, size_t bytes)
 750 {
 751         int cpu;
 752
 753         for_each_possible_cpu(cpu)
 754                 memset(per_cpu_ptr(p, cpu), c, bytes);
 755 }
 756
 757 u64 *bch2_acc_percpu_u64s(u64 __percpu *, unsigned);
 758
 759 #define cmp_int(l, r)           ((l > r) - (l < r))
 760
 761 #endif /* _BCACHEFS_UTIL_H */