From f5baaf48e3e82b1caf9f5cd1207d4d6feba3a2e5 Mon Sep 17 00:00:00 2001 From: Thomas Bertschinger Date: Mon, 15 Jan 2024 23:41:02 -0700 Subject: move Rust sources to top level, C sources into c_src This moves the Rust sources out of rust_src/ and into the top level. Running the bcachefs executable out of the development tree is now: $ ./target/release/bcachefs command or $ cargo run --profile release -- command instead of "./bcachefs command". Building and installing is still: $ make && make install Signed-off-by: Thomas Bertschinger Signed-off-by: Kent Overstreet --- c_src/libbcachefs/util.h | 878 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 878 insertions(+) create mode 100644 c_src/libbcachefs/util.h (limited to 'c_src/libbcachefs/util.h') diff --git a/c_src/libbcachefs/util.h b/c_src/libbcachefs/util.h new file mode 100644 index 00000000..c75fc319 --- /dev/null +++ b/c_src/libbcachefs/util.h @@ -0,0 +1,878 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _BCACHEFS_UTIL_H +#define _BCACHEFS_UTIL_H + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "mean_and_variance.h" + +#include "darray.h" + +struct closure; + +#ifdef CONFIG_BCACHEFS_DEBUG +#define EBUG_ON(cond) BUG_ON(cond) +#else +#define EBUG_ON(cond) +#endif + +#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ +#define CPU_BIG_ENDIAN 0 +#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ +#define CPU_BIG_ENDIAN 1 +#endif + +/* type hackery */ + +#define type_is_exact(_val, _type) \ + __builtin_types_compatible_p(typeof(_val), _type) + +#define type_is(_val, _type) \ + (__builtin_types_compatible_p(typeof(_val), _type) || \ + __builtin_types_compatible_p(typeof(_val), const _type)) + +/* Userspace doesn't align allocations as nicely as the kernel allocators: */ +static inline size_t buf_pages(void *p, size_t len) +{ + return DIV_ROUND_UP(len + + ((unsigned long) p & (PAGE_SIZE - 1)), + PAGE_SIZE); +} + +static inline void vpfree(void *p, size_t size) +{ + if (is_vmalloc_addr(p)) + vfree(p); + else + free_pages((unsigned long) p, get_order(size)); +} + +static inline void *vpmalloc(size_t size, gfp_t gfp_mask) +{ + return (void *) __get_free_pages(gfp_mask|__GFP_NOWARN, + get_order(size)) ?: + __vmalloc(size, gfp_mask); +} + +static inline void kvpfree(void *p, size_t size) +{ + if (size < PAGE_SIZE) + kfree(p); + else + vpfree(p, size); +} + +static inline void *kvpmalloc(size_t size, gfp_t gfp_mask) +{ + return size < PAGE_SIZE + ? kmalloc(size, gfp_mask) + : vpmalloc(size, gfp_mask); +} + +int mempool_init_kvpmalloc_pool(mempool_t *, int, size_t); + +#define HEAP(type) \ +struct { \ + size_t size, used; \ + type *data; \ +} + +#define DECLARE_HEAP(type, name) HEAP(type) name + +#define init_heap(heap, _size, gfp) \ +({ \ + (heap)->used = 0; \ + (heap)->size = (_size); \ + (heap)->data = kvpmalloc((heap)->size * sizeof((heap)->data[0]),\ + (gfp)); \ +}) + +#define free_heap(heap) \ +do { \ + kvpfree((heap)->data, (heap)->size * sizeof((heap)->data[0])); \ + (heap)->data = NULL; \ +} while (0) + +#define heap_set_backpointer(h, i, _fn) \ +do { \ + void (*fn)(typeof(h), size_t) = _fn; \ + if (fn) \ + fn(h, i); \ +} while (0) + +#define heap_swap(h, i, j, set_backpointer) \ +do { \ + swap((h)->data[i], (h)->data[j]); \ + heap_set_backpointer(h, i, set_backpointer); \ + heap_set_backpointer(h, j, set_backpointer); \ +} while (0) + +#define heap_peek(h) \ +({ \ + EBUG_ON(!(h)->used); \ + (h)->data[0]; \ +}) + +#define heap_full(h) ((h)->used == (h)->size) + +#define heap_sift_down(h, i, cmp, set_backpointer) \ +do { \ + size_t _c, _j = i; \ + \ + for (; _j * 2 + 1 < (h)->used; _j = _c) { \ + _c = _j * 2 + 1; \ + if (_c + 1 < (h)->used && \ + cmp(h, (h)->data[_c], (h)->data[_c + 1]) >= 0) \ + _c++; \ + \ + if (cmp(h, (h)->data[_c], (h)->data[_j]) >= 0) \ + break; \ + heap_swap(h, _c, _j, set_backpointer); \ + } \ +} while (0) + +#define heap_sift_up(h, i, cmp, set_backpointer) \ +do { \ + while (i) { \ + size_t p = (i - 1) / 2; \ + if (cmp(h, (h)->data[i], (h)->data[p]) >= 0) \ + break; \ + heap_swap(h, i, p, set_backpointer); \ + i = p; \ + } \ +} while (0) + +#define __heap_add(h, d, cmp, set_backpointer) \ +({ \ + size_t _i = (h)->used++; \ + (h)->data[_i] = d; \ + heap_set_backpointer(h, _i, set_backpointer); \ + \ + heap_sift_up(h, _i, cmp, set_backpointer); \ + _i; \ +}) + +#define heap_add(h, d, cmp, set_backpointer) \ +({ \ + bool _r = !heap_full(h); \ + if (_r) \ + __heap_add(h, d, cmp, set_backpointer); \ + _r; \ +}) + +#define heap_add_or_replace(h, new, cmp, set_backpointer) \ +do { \ + if (!heap_add(h, new, cmp, set_backpointer) && \ + cmp(h, new, heap_peek(h)) >= 0) { \ + (h)->data[0] = new; \ + heap_set_backpointer(h, 0, set_backpointer); \ + heap_sift_down(h, 0, cmp, set_backpointer); \ + } \ +} while (0) + +#define heap_del(h, i, cmp, set_backpointer) \ +do { \ + size_t _i = (i); \ + \ + BUG_ON(_i >= (h)->used); \ + (h)->used--; \ + if ((_i) < (h)->used) { \ + heap_swap(h, _i, (h)->used, set_backpointer); \ + heap_sift_up(h, _i, cmp, set_backpointer); \ + heap_sift_down(h, _i, cmp, set_backpointer); \ + } \ +} while (0) + +#define heap_pop(h, d, cmp, set_backpointer) \ +({ \ + bool _r = (h)->used; \ + if (_r) { \ + (d) = (h)->data[0]; \ + heap_del(h, 0, cmp, set_backpointer); \ + } \ + _r; \ +}) + +#define heap_resort(heap, cmp, set_backpointer) \ +do { \ + ssize_t _i; \ + for (_i = (ssize_t) (heap)->used / 2 - 1; _i >= 0; --_i) \ + heap_sift_down(heap, _i, cmp, set_backpointer); \ +} while (0) + +#define ANYSINT_MAX(t) \ + ((((t) 1 << (sizeof(t) * 8 - 2)) - (t) 1) * (t) 2 + (t) 1) + +#include "printbuf.h" + +#define prt_vprintf(_out, ...) bch2_prt_vprintf(_out, __VA_ARGS__) +#define prt_printf(_out, ...) bch2_prt_printf(_out, __VA_ARGS__) +#define printbuf_str(_buf) bch2_printbuf_str(_buf) +#define printbuf_exit(_buf) bch2_printbuf_exit(_buf) + +#define printbuf_tabstops_reset(_buf) bch2_printbuf_tabstops_reset(_buf) +#define printbuf_tabstop_pop(_buf) bch2_printbuf_tabstop_pop(_buf) +#define printbuf_tabstop_push(_buf, _n) bch2_printbuf_tabstop_push(_buf, _n) + +#define printbuf_indent_add(_out, _n) bch2_printbuf_indent_add(_out, _n) +#define printbuf_indent_sub(_out, _n) bch2_printbuf_indent_sub(_out, _n) + +#define prt_newline(_out) bch2_prt_newline(_out) +#define prt_tab(_out) bch2_prt_tab(_out) +#define prt_tab_rjust(_out) bch2_prt_tab_rjust(_out) + +#define prt_bytes_indented(...) bch2_prt_bytes_indented(__VA_ARGS__) +#define prt_u64(_out, _v) prt_printf(_out, "%llu", (u64) (_v)) +#define prt_human_readable_u64(...) bch2_prt_human_readable_u64(__VA_ARGS__) +#define prt_human_readable_s64(...) bch2_prt_human_readable_s64(__VA_ARGS__) +#define prt_units_u64(...) bch2_prt_units_u64(__VA_ARGS__) +#define prt_units_s64(...) bch2_prt_units_s64(__VA_ARGS__) +#define prt_string_option(...) bch2_prt_string_option(__VA_ARGS__) +#define prt_bitflags(...) bch2_prt_bitflags(__VA_ARGS__) +#define prt_bitflags_vector(...) bch2_prt_bitflags_vector(__VA_ARGS__) + +void bch2_pr_time_units(struct printbuf *, u64); +void bch2_prt_datetime(struct printbuf *, time64_t); + +#ifdef __KERNEL__ +static inline void uuid_unparse_lower(u8 *uuid, char *out) +{ + sprintf(out, "%pUb", uuid); +} +#else +#include +#endif + +static inline void pr_uuid(struct printbuf *out, u8 *uuid) +{ + char uuid_str[40]; + + uuid_unparse_lower(uuid, uuid_str); + prt_printf(out, "%s", uuid_str); +} + +int bch2_strtoint_h(const char *, int *); +int bch2_strtouint_h(const char *, unsigned int *); +int bch2_strtoll_h(const char *, long long *); +int bch2_strtoull_h(const char *, unsigned long long *); +int bch2_strtou64_h(const char *, u64 *); + +static inline int bch2_strtol_h(const char *cp, long *res) +{ +#if BITS_PER_LONG == 32 + return bch2_strtoint_h(cp, (int *) res); +#else + return bch2_strtoll_h(cp, (long long *) res); +#endif +} + +static inline int bch2_strtoul_h(const char *cp, long *res) +{ +#if BITS_PER_LONG == 32 + return bch2_strtouint_h(cp, (unsigned int *) res); +#else + return bch2_strtoull_h(cp, (unsigned long long *) res); +#endif +} + +#define strtoi_h(cp, res) \ + ( type_is(*res, int) ? bch2_strtoint_h(cp, (void *) res)\ + : type_is(*res, long) ? bch2_strtol_h(cp, (void *) res)\ + : type_is(*res, long long) ? bch2_strtoll_h(cp, (void *) res)\ + : type_is(*res, unsigned) ? bch2_strtouint_h(cp, (void *) res)\ + : type_is(*res, unsigned long) ? bch2_strtoul_h(cp, (void *) res)\ + : type_is(*res, unsigned long long) ? bch2_strtoull_h(cp, (void *) res)\ + : -EINVAL) + +#define strtoul_safe(cp, var) \ +({ \ + unsigned long _v; \ + int _r = kstrtoul(cp, 10, &_v); \ + if (!_r) \ + var = _v; \ + _r; \ +}) + +#define strtoul_safe_clamp(cp, var, min, max) \ +({ \ + unsigned long _v; \ + int _r = kstrtoul(cp, 10, &_v); \ + if (!_r) \ + var = clamp_t(typeof(var), _v, min, max); \ + _r; \ +}) + +#define strtoul_safe_restrict(cp, var, min, max) \ +({ \ + unsigned long _v; \ + int _r = kstrtoul(cp, 10, &_v); \ + if (!_r && _v >= min && _v <= max) \ + var = _v; \ + else \ + _r = -EINVAL; \ + _r; \ +}) + +#define snprint(out, var) \ + prt_printf(out, \ + type_is(var, int) ? "%i\n" \ + : type_is(var, unsigned) ? "%u\n" \ + : type_is(var, long) ? "%li\n" \ + : type_is(var, unsigned long) ? "%lu\n" \ + : type_is(var, s64) ? "%lli\n" \ + : type_is(var, u64) ? "%llu\n" \ + : type_is(var, char *) ? "%s\n" \ + : "%i\n", var) + +bool bch2_is_zero(const void *, size_t); + +u64 bch2_read_flag_list(char *, const char * const[]); + +void bch2_prt_u64_binary(struct printbuf *, u64, unsigned); + +void bch2_print_string_as_lines(const char *prefix, const char *lines); + +typedef DARRAY(unsigned long) bch_stacktrace; +int bch2_save_backtrace(bch_stacktrace *stack, struct task_struct *, unsigned); +void bch2_prt_backtrace(struct printbuf *, bch_stacktrace *); +int bch2_prt_task_backtrace(struct printbuf *, struct task_struct *, unsigned); + +static inline void prt_bdevname(struct printbuf *out, struct block_device *bdev) +{ +#ifdef __KERNEL__ + prt_printf(out, "%pg", bdev); +#else + prt_str(out, bdev->name); +#endif +} + +#define NR_QUANTILES 15 +#define QUANTILE_IDX(i) inorder_to_eytzinger0(i, NR_QUANTILES) +#define QUANTILE_FIRST eytzinger0_first(NR_QUANTILES) +#define QUANTILE_LAST eytzinger0_last(NR_QUANTILES) + +struct bch2_quantiles { + struct bch2_quantile_entry { + u64 m; + u64 step; + } entries[NR_QUANTILES]; +}; + +struct bch2_time_stat_buffer { + unsigned nr; + struct bch2_time_stat_buffer_entry { + u64 start; + u64 end; + } entries[32]; +}; + +struct bch2_time_stats { + spinlock_t lock; + /* all fields are in nanoseconds */ + u64 min_duration; + u64 max_duration; + u64 total_duration; + u64 max_freq; + u64 min_freq; + u64 last_event; + struct bch2_quantiles quantiles; + + struct mean_and_variance duration_stats; + struct mean_and_variance_weighted duration_stats_weighted; + struct mean_and_variance freq_stats; + struct mean_and_variance_weighted freq_stats_weighted; + struct bch2_time_stat_buffer __percpu *buffer; +}; + +#ifndef CONFIG_BCACHEFS_NO_LATENCY_ACCT +void __bch2_time_stats_update(struct bch2_time_stats *stats, u64, u64); + +static inline void bch2_time_stats_update(struct bch2_time_stats *stats, u64 start) +{ + __bch2_time_stats_update(stats, start, local_clock()); +} + +static inline bool track_event_change(struct bch2_time_stats *stats, + u64 *start, bool v) +{ + if (v != !!*start) { + if (!v) { + bch2_time_stats_update(stats, *start); + *start = 0; + } else { + *start = local_clock() ?: 1; + return true; + } + } + + return false; +} +#else +static inline void __bch2_time_stats_update(struct bch2_time_stats *stats, u64 start, u64 end) {} +static inline void bch2_time_stats_update(struct bch2_time_stats *stats, u64 start) {} +static inline bool track_event_change(struct bch2_time_stats *stats, + u64 *start, bool v) +{ + bool ret = v && !*start; + *start = v; + return ret; +} +#endif + +void bch2_time_stats_to_text(struct printbuf *, struct bch2_time_stats *); + +void bch2_time_stats_exit(struct bch2_time_stats *); +void bch2_time_stats_init(struct bch2_time_stats *); + +#define ewma_add(ewma, val, weight) \ +({ \ + typeof(ewma) _ewma = (ewma); \ + typeof(weight) _weight = (weight); \ + \ + (((_ewma << _weight) - _ewma) + (val)) >> _weight; \ +}) + +struct bch_ratelimit { + /* Next time we want to do some work, in nanoseconds */ + u64 next; + + /* + * Rate at which we want to do work, in units per nanosecond + * The units here correspond to the units passed to + * bch2_ratelimit_increment() + */ + unsigned rate; +}; + +static inline void bch2_ratelimit_reset(struct bch_ratelimit *d) +{ + d->next = local_clock(); +} + +u64 bch2_ratelimit_delay(struct bch_ratelimit *); +void bch2_ratelimit_increment(struct bch_ratelimit *, u64); + +struct bch_pd_controller { + struct bch_ratelimit rate; + unsigned long last_update; + + s64 last_actual; + s64 smoothed_derivative; + + unsigned p_term_inverse; + unsigned d_smooth; + unsigned d_term; + + /* for exporting to sysfs (no effect on behavior) */ + s64 last_derivative; + s64 last_proportional; + s64 last_change; + s64 last_target; + + /* + * If true, the rate will not increase if bch2_ratelimit_delay() + * is not being called often enough. + */ + bool backpressure; +}; + +void bch2_pd_controller_update(struct bch_pd_controller *, s64, s64, int); +void bch2_pd_controller_init(struct bch_pd_controller *); +void bch2_pd_controller_debug_to_text(struct printbuf *, struct bch_pd_controller *); + +#define sysfs_pd_controller_attribute(name) \ + rw_attribute(name##_rate); \ + rw_attribute(name##_rate_bytes); \ + rw_attribute(name##_rate_d_term); \ + rw_attribute(name##_rate_p_term_inverse); \ + read_attribute(name##_rate_debug) + +#define sysfs_pd_controller_files(name) \ + &sysfs_##name##_rate, \ + &sysfs_##name##_rate_bytes, \ + &sysfs_##name##_rate_d_term, \ + &sysfs_##name##_rate_p_term_inverse, \ + &sysfs_##name##_rate_debug + +#define sysfs_pd_controller_show(name, var) \ +do { \ + sysfs_hprint(name##_rate, (var)->rate.rate); \ + sysfs_print(name##_rate_bytes, (var)->rate.rate); \ + sysfs_print(name##_rate_d_term, (var)->d_term); \ + sysfs_print(name##_rate_p_term_inverse, (var)->p_term_inverse); \ + \ + if (attr == &sysfs_##name##_rate_debug) \ + bch2_pd_controller_debug_to_text(out, var); \ +} while (0) + +#define sysfs_pd_controller_store(name, var) \ +do { \ + sysfs_strtoul_clamp(name##_rate, \ + (var)->rate.rate, 1, UINT_MAX); \ + sysfs_strtoul_clamp(name##_rate_bytes, \ + (var)->rate.rate, 1, UINT_MAX); \ + sysfs_strtoul(name##_rate_d_term, (var)->d_term); \ + sysfs_strtoul_clamp(name##_rate_p_term_inverse, \ + (var)->p_term_inverse, 1, INT_MAX); \ +} while (0) + +#define container_of_or_null(ptr, type, member) \ +({ \ + typeof(ptr) _ptr = ptr; \ + _ptr ? container_of(_ptr, type, member) : NULL; \ +}) + +/* Does linear interpolation between powers of two */ +static inline unsigned fract_exp_two(unsigned x, unsigned fract_bits) +{ + unsigned fract = x & ~(~0 << fract_bits); + + x >>= fract_bits; + x = 1 << x; + x += (x * fract) >> fract_bits; + + return x; +} + +void bch2_bio_map(struct bio *bio, void *base, size_t); +int bch2_bio_alloc_pages(struct bio *, size_t, gfp_t); + +static inline sector_t bdev_sectors(struct block_device *bdev) +{ + return bdev->bd_inode->i_size >> 9; +} + +#define closure_bio_submit(bio, cl) \ +do { \ + closure_get(cl); \ + submit_bio(bio); \ +} while (0) + +#define kthread_wait(cond) \ +({ \ + int _ret = 0; \ + \ + while (1) { \ + set_current_state(TASK_INTERRUPTIBLE); \ + if (kthread_should_stop()) { \ + _ret = -1; \ + break; \ + } \ + \ + if (cond) \ + break; \ + \ + schedule(); \ + } \ + set_current_state(TASK_RUNNING); \ + _ret; \ +}) + +#define kthread_wait_freezable(cond) \ +({ \ + int _ret = 0; \ + while (1) { \ + set_current_state(TASK_INTERRUPTIBLE); \ + if (kthread_should_stop()) { \ + _ret = -1; \ + break; \ + } \ + \ + if (cond) \ + break; \ + \ + schedule(); \ + try_to_freeze(); \ + } \ + set_current_state(TASK_RUNNING); \ + _ret; \ +}) + +size_t bch2_rand_range(size_t); + +void memcpy_to_bio(struct bio *, struct bvec_iter, const void *); +void memcpy_from_bio(void *, struct bio *, struct bvec_iter); + +static inline void memcpy_u64s_small(void *dst, const void *src, + unsigned u64s) +{ + u64 *d = dst; + const u64 *s = src; + + while (u64s--) + *d++ = *s++; +} + +static inline void __memcpy_u64s(void *dst, const void *src, + unsigned u64s) +{ +#ifdef CONFIG_X86_64 + long d0, d1, d2; + + asm volatile("rep ; movsq" + : "=&c" (d0), "=&D" (d1), "=&S" (d2) + : "0" (u64s), "1" (dst), "2" (src) + : "memory"); +#else + u64 *d = dst; + const u64 *s = src; + + while (u64s--) + *d++ = *s++; +#endif +} + +static inline void memcpy_u64s(void *dst, const void *src, + unsigned u64s) +{ + EBUG_ON(!(dst >= src + u64s * sizeof(u64) || + dst + u64s * sizeof(u64) <= src)); + + __memcpy_u64s(dst, src, u64s); +} + +static inline void __memmove_u64s_down(void *dst, const void *src, + unsigned u64s) +{ + __memcpy_u64s(dst, src, u64s); +} + +static inline void memmove_u64s_down(void *dst, const void *src, + unsigned u64s) +{ + EBUG_ON(dst > src); + + __memmove_u64s_down(dst, src, u64s); +} + +static inline void __memmove_u64s_down_small(void *dst, const void *src, + unsigned u64s) +{ + memcpy_u64s_small(dst, src, u64s); +} + +static inline void memmove_u64s_down_small(void *dst, const void *src, + unsigned u64s) +{ + EBUG_ON(dst > src); + + __memmove_u64s_down_small(dst, src, u64s); +} + +static inline void __memmove_u64s_up_small(void *_dst, const void *_src, + unsigned u64s) +{ + u64 *dst = (u64 *) _dst + u64s; + u64 *src = (u64 *) _src + u64s; + + while (u64s--) + *--dst = *--src; +} + +static inline void memmove_u64s_up_small(void *dst, const void *src, + unsigned u64s) +{ + EBUG_ON(dst < src); + + __memmove_u64s_up_small(dst, src, u64s); +} + +static inline void __memmove_u64s_up(void *_dst, const void *_src, + unsigned u64s) +{ + u64 *dst = (u64 *) _dst + u64s - 1; + u64 *src = (u64 *) _src + u64s - 1; + +#ifdef CONFIG_X86_64 + long d0, d1, d2; + + asm volatile("std ;\n" + "rep ; movsq\n" + "cld ;\n" + : "=&c" (d0), "=&D" (d1), "=&S" (d2) + : "0" (u64s), "1" (dst), "2" (src) + : "memory"); +#else + while (u64s--) + *dst-- = *src--; +#endif +} + +static inline void memmove_u64s_up(void *dst, const void *src, + unsigned u64s) +{ + EBUG_ON(dst < src); + + __memmove_u64s_up(dst, src, u64s); +} + +static inline void memmove_u64s(void *dst, const void *src, + unsigned u64s) +{ + if (dst < src) + __memmove_u64s_down(dst, src, u64s); + else + __memmove_u64s_up(dst, src, u64s); +} + +/* Set the last few bytes up to a u64 boundary given an offset into a buffer. */ +static inline void memset_u64s_tail(void *s, int c, unsigned bytes) +{ + unsigned rem = round_up(bytes, sizeof(u64)) - bytes; + + memset(s + bytes, c, rem); +} + +void sort_cmp_size(void *base, size_t num, size_t size, + int (*cmp_func)(const void *, const void *, size_t), + void (*swap_func)(void *, void *, size_t)); + +/* just the memmove, doesn't update @_nr */ +#define __array_insert_item(_array, _nr, _pos) \ + memmove(&(_array)[(_pos) + 1], \ + &(_array)[(_pos)], \ + sizeof((_array)[0]) * ((_nr) - (_pos))) + +#define array_insert_item(_array, _nr, _pos, _new_item) \ +do { \ + __array_insert_item(_array, _nr, _pos); \ + (_nr)++; \ + (_array)[(_pos)] = (_new_item); \ +} while (0) + +#define array_remove_items(_array, _nr, _pos, _nr_to_remove) \ +do { \ + (_nr) -= (_nr_to_remove); \ + memmove(&(_array)[(_pos)], \ + &(_array)[(_pos) + (_nr_to_remove)], \ + sizeof((_array)[0]) * ((_nr) - (_pos))); \ +} while (0) + +#define array_remove_item(_array, _nr, _pos) \ + array_remove_items(_array, _nr, _pos, 1) + +static inline void __move_gap(void *array, size_t element_size, + size_t nr, size_t size, + size_t old_gap, size_t new_gap) +{ + size_t gap_end = old_gap + size - nr; + + if (new_gap < old_gap) { + size_t move = old_gap - new_gap; + + memmove(array + element_size * (gap_end - move), + array + element_size * (old_gap - move), + element_size * move); + } else if (new_gap > old_gap) { + size_t move = new_gap - old_gap; + + memmove(array + element_size * old_gap, + array + element_size * gap_end, + element_size * move); + } +} + +/* Move the gap in a gap buffer: */ +#define move_gap(_array, _nr, _size, _old_gap, _new_gap) \ + __move_gap(_array, sizeof(_array[0]), _nr, _size, _old_gap, _new_gap) + +#define bubble_sort(_base, _nr, _cmp) \ +do { \ + ssize_t _i, _last; \ + bool _swapped = true; \ + \ + for (_last= (ssize_t) (_nr) - 1; _last > 0 && _swapped; --_last) {\ + _swapped = false; \ + for (_i = 0; _i < _last; _i++) \ + if (_cmp((_base)[_i], (_base)[_i + 1]) > 0) { \ + swap((_base)[_i], (_base)[_i + 1]); \ + _swapped = true; \ + } \ + } \ +} while (0) + +static inline u64 percpu_u64_get(u64 __percpu *src) +{ + u64 ret = 0; + int cpu; + + for_each_possible_cpu(cpu) + ret += *per_cpu_ptr(src, cpu); + return ret; +} + +static inline void percpu_u64_set(u64 __percpu *dst, u64 src) +{ + int cpu; + + for_each_possible_cpu(cpu) + *per_cpu_ptr(dst, cpu) = 0; + this_cpu_write(*dst, src); +} + +static inline void acc_u64s(u64 *acc, const u64 *src, unsigned nr) +{ + unsigned i; + + for (i = 0; i < nr; i++) + acc[i] += src[i]; +} + +static inline void acc_u64s_percpu(u64 *acc, const u64 __percpu *src, + unsigned nr) +{ + int cpu; + + for_each_possible_cpu(cpu) + acc_u64s(acc, per_cpu_ptr(src, cpu), nr); +} + +static inline void percpu_memset(void __percpu *p, int c, size_t bytes) +{ + int cpu; + + for_each_possible_cpu(cpu) + memset(per_cpu_ptr(p, cpu), c, bytes); +} + +u64 *bch2_acc_percpu_u64s(u64 __percpu *, unsigned); + +#define cmp_int(l, r) ((l > r) - (l < r)) + +static inline int u8_cmp(u8 l, u8 r) +{ + return cmp_int(l, r); +} + +static inline int cmp_le32(__le32 l, __le32 r) +{ + return cmp_int(le32_to_cpu(l), le32_to_cpu(r)); +} + +#include + +#define QSTR(n) { { { .len = strlen(n) } }, .name = n } + +static inline bool qstr_eq(const struct qstr l, const struct qstr r) +{ + return l.len == r.len && !memcmp(l.name, r.name, l.len); +} + +void bch2_darray_str_exit(darray_str *); +int bch2_split_devs(const char *, darray_str *); + +#endif /* _BCACHEFS_UTIL_H */ -- cgit v1.2.3