378 lines
11 KiB
C
378 lines
11 KiB
C
/*
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* random utiility code, for bcache but in theory not specific to bcache
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*
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* Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com>
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* Copyright 2012 Google, Inc.
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*/
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#include <linux/bio.h>
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#include <linux/blkdev.h>
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#include <linux/ctype.h>
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#include <linux/debugfs.h>
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#include <linux/module.h>
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#include <linux/seq_file.h>
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#include <linux/types.h>
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#include "util.h"
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#define simple_strtoint(c, end, base) simple_strtol(c, end, base)
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#define simple_strtouint(c, end, base) simple_strtoul(c, end, base)
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#define STRTO_H(name, type) \
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int bch_ ## name ## _h(const char *cp, type *res) \
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{ \
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int u = 0; \
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char *e; \
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type i = simple_ ## name(cp, &e, 10); \
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\
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switch (tolower(*e)) { \
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default: \
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return -EINVAL; \
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case 'y': \
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case 'z': \
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u++; \
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case 'e': \
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u++; \
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case 'p': \
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u++; \
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case 't': \
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u++; \
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case 'g': \
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u++; \
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case 'm': \
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u++; \
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case 'k': \
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u++; \
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if (e++ == cp) \
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return -EINVAL; \
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case '\n': \
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case '\0': \
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if (*e == '\n') \
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e++; \
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} \
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\
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if (*e) \
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return -EINVAL; \
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\
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while (u--) { \
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if ((type) ~0 > 0 && \
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(type) ~0 / 1024 <= i) \
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return -EINVAL; \
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if ((i > 0 && ANYSINT_MAX(type) / 1024 < i) || \
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(i < 0 && -ANYSINT_MAX(type) / 1024 > i)) \
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return -EINVAL; \
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i *= 1024; \
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} \
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\
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*res = i; \
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return 0; \
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} \
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STRTO_H(strtoint, int)
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STRTO_H(strtouint, unsigned int)
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STRTO_H(strtoll, long long)
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STRTO_H(strtoull, unsigned long long)
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ssize_t bch_hprint(char *buf, int64_t v)
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{
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static const char units[] = "?kMGTPEZY";
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char dec[3] = "";
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int u, t = 0;
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for (u = 0; v >= 1024 || v <= -1024; u++) {
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t = v & ~(~0 << 10);
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v >>= 10;
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}
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if (!u)
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return sprintf(buf, "%llu", v);
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if (v < 100 && v > -100)
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sprintf(dec, ".%i", t / 100);
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return sprintf(buf, "%lli%s%c", v, dec, units[u]);
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}
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ssize_t bch_snprint_string_list(char *buf, size_t size, const char * const list[],
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size_t selected)
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{
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char *out = buf;
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size_t i;
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for (i = 0; list[i]; i++)
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out += snprintf(out, buf + size - out,
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i == selected ? "[%s] " : "%s ", list[i]);
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out[-1] = '\n';
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return out - buf;
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}
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ssize_t bch_read_string_list(const char *buf, const char * const list[])
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{
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size_t i;
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char *s, *d = kstrndup(buf, PAGE_SIZE - 1, GFP_KERNEL);
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if (!d)
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return -ENOMEM;
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s = strim(d);
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for (i = 0; list[i]; i++)
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if (!strcmp(list[i], s))
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break;
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kfree(d);
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if (!list[i])
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return -EINVAL;
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return i;
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}
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bool bch_is_zero(const char *p, size_t n)
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{
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size_t i;
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for (i = 0; i < n; i++)
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if (p[i])
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return false;
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return true;
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}
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int bch_parse_uuid(const char *s, char *uuid)
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{
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size_t i, j, x;
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memset(uuid, 0, 16);
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for (i = 0, j = 0;
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i < strspn(s, "-0123456789:ABCDEFabcdef") && j < 32;
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i++) {
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x = s[i] | 32;
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switch (x) {
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case '0'...'9':
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x -= '0';
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break;
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case 'a'...'f':
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x -= 'a' - 10;
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break;
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default:
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continue;
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}
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if (!(j & 1))
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x <<= 4;
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uuid[j++ >> 1] |= x;
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}
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return i;
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}
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void bch_time_stats_update(struct time_stats *stats, uint64_t start_time)
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{
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uint64_t now = local_clock();
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uint64_t duration = time_after64(now, start_time)
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? now - start_time : 0;
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uint64_t last = time_after64(now, stats->last)
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? now - stats->last : 0;
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stats->max_duration = max(stats->max_duration, duration);
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if (stats->last) {
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ewma_add(stats->average_duration, duration, 8, 8);
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if (stats->average_frequency)
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ewma_add(stats->average_frequency, last, 8, 8);
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else
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stats->average_frequency = last << 8;
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} else {
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stats->average_duration = duration << 8;
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}
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stats->last = now ?: 1;
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}
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unsigned bch_next_delay(struct ratelimit *d, uint64_t done)
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{
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uint64_t now = local_clock();
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d->next += div_u64(done, d->rate);
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return time_after64(d->next, now)
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? div_u64(d->next - now, NSEC_PER_SEC / HZ)
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: 0;
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}
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void bch_bio_map(struct bio *bio, void *base)
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{
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size_t size = bio->bi_size;
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struct bio_vec *bv = bio->bi_io_vec;
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BUG_ON(!bio->bi_size);
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BUG_ON(bio->bi_vcnt);
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bv->bv_offset = base ? ((unsigned long) base) % PAGE_SIZE : 0;
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goto start;
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for (; size; bio->bi_vcnt++, bv++) {
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bv->bv_offset = 0;
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start: bv->bv_len = min_t(size_t, PAGE_SIZE - bv->bv_offset,
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size);
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if (base) {
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bv->bv_page = is_vmalloc_addr(base)
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? vmalloc_to_page(base)
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: virt_to_page(base);
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base += bv->bv_len;
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}
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size -= bv->bv_len;
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}
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}
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int bch_bio_alloc_pages(struct bio *bio, gfp_t gfp)
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{
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int i;
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struct bio_vec *bv;
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bio_for_each_segment(bv, bio, i) {
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bv->bv_page = alloc_page(gfp);
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if (!bv->bv_page) {
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while (bv-- != bio->bi_io_vec + bio->bi_idx)
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__free_page(bv->bv_page);
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return -ENOMEM;
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}
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}
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return 0;
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}
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/*
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* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group (Any
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* use permitted, subject to terms of PostgreSQL license; see.)
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* If we have a 64-bit integer type, then a 64-bit CRC looks just like the
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* usual sort of implementation. (See Ross Williams' excellent introduction
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* A PAINLESS GUIDE TO CRC ERROR DETECTION ALGORITHMS, available from
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* ftp://ftp.rocksoft.com/papers/crc_v3.txt or several other net sites.)
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* If we have no working 64-bit type, then fake it with two 32-bit registers.
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*
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* The present implementation is a normal (not "reflected", in Williams'
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* terms) 64-bit CRC, using initial all-ones register contents and a final
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* bit inversion. The chosen polynomial is borrowed from the DLT1 spec
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* (ECMA-182, available from http://www.ecma.ch/ecma1/STAND/ECMA-182.HTM):
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*
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* x^64 + x^62 + x^57 + x^55 + x^54 + x^53 + x^52 + x^47 + x^46 + x^45 +
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* x^40 + x^39 + x^38 + x^37 + x^35 + x^33 + x^32 + x^31 + x^29 + x^27 +
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* x^24 + x^23 + x^22 + x^21 + x^19 + x^17 + x^13 + x^12 + x^10 + x^9 +
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* x^7 + x^4 + x + 1
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*/
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static const uint64_t crc_table[256] = {
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0x0000000000000000, 0x42F0E1EBA9EA3693, 0x85E1C3D753D46D26,
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0xC711223CFA3E5BB5, 0x493366450E42ECDF, 0x0BC387AEA7A8DA4C,
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0xCCD2A5925D9681F9, 0x8E224479F47CB76A, 0x9266CC8A1C85D9BE,
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0xD0962D61B56FEF2D, 0x17870F5D4F51B498, 0x5577EEB6E6BB820B,
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0xDB55AACF12C73561, 0x99A54B24BB2D03F2, 0x5EB4691841135847,
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0x1C4488F3E8F96ED4, 0x663D78FF90E185EF, 0x24CD9914390BB37C,
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0xE3DCBB28C335E8C9, 0xA12C5AC36ADFDE5A, 0x2F0E1EBA9EA36930,
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0x6DFEFF5137495FA3, 0xAAEFDD6DCD770416, 0xE81F3C86649D3285,
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0xF45BB4758C645C51, 0xB6AB559E258E6AC2, 0x71BA77A2DFB03177,
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0x334A9649765A07E4, 0xBD68D2308226B08E, 0xFF9833DB2BCC861D,
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0x388911E7D1F2DDA8, 0x7A79F00C7818EB3B, 0xCC7AF1FF21C30BDE,
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0x8E8A101488293D4D, 0x499B3228721766F8, 0x0B6BD3C3DBFD506B,
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0x854997BA2F81E701, 0xC7B97651866BD192, 0x00A8546D7C558A27,
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0x4258B586D5BFBCB4, 0x5E1C3D753D46D260, 0x1CECDC9E94ACE4F3,
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0xDBFDFEA26E92BF46, 0x990D1F49C77889D5, 0x172F5B3033043EBF,
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0x55DFBADB9AEE082C, 0x92CE98E760D05399, 0xD03E790CC93A650A,
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0xAA478900B1228E31, 0xE8B768EB18C8B8A2, 0x2FA64AD7E2F6E317,
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0x6D56AB3C4B1CD584, 0xE374EF45BF6062EE, 0xA1840EAE168A547D,
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0x66952C92ECB40FC8, 0x2465CD79455E395B, 0x3821458AADA7578F,
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0x7AD1A461044D611C, 0xBDC0865DFE733AA9, 0xFF3067B657990C3A,
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0x711223CFA3E5BB50, 0x33E2C2240A0F8DC3, 0xF4F3E018F031D676,
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0xB60301F359DBE0E5, 0xDA050215EA6C212F, 0x98F5E3FE438617BC,
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0x5FE4C1C2B9B84C09, 0x1D14202910527A9A, 0x93366450E42ECDF0,
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0xD1C685BB4DC4FB63, 0x16D7A787B7FAA0D6, 0x5427466C1E109645,
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0x4863CE9FF6E9F891, 0x0A932F745F03CE02, 0xCD820D48A53D95B7,
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0x8F72ECA30CD7A324, 0x0150A8DAF8AB144E, 0x43A04931514122DD,
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0x84B16B0DAB7F7968, 0xC6418AE602954FFB, 0xBC387AEA7A8DA4C0,
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0xFEC89B01D3679253, 0x39D9B93D2959C9E6, 0x7B2958D680B3FF75,
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0xF50B1CAF74CF481F, 0xB7FBFD44DD257E8C, 0x70EADF78271B2539,
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0x321A3E938EF113AA, 0x2E5EB66066087D7E, 0x6CAE578BCFE24BED,
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0xABBF75B735DC1058, 0xE94F945C9C3626CB, 0x676DD025684A91A1,
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0x259D31CEC1A0A732, 0xE28C13F23B9EFC87, 0xA07CF2199274CA14,
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0x167FF3EACBAF2AF1, 0x548F120162451C62, 0x939E303D987B47D7,
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0xD16ED1D631917144, 0x5F4C95AFC5EDC62E, 0x1DBC74446C07F0BD,
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0xDAAD56789639AB08, 0x985DB7933FD39D9B, 0x84193F60D72AF34F,
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0xC6E9DE8B7EC0C5DC, 0x01F8FCB784FE9E69, 0x43081D5C2D14A8FA,
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0xCD2A5925D9681F90, 0x8FDAB8CE70822903, 0x48CB9AF28ABC72B6,
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0x0A3B7B1923564425, 0x70428B155B4EAF1E, 0x32B26AFEF2A4998D,
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0xF5A348C2089AC238, 0xB753A929A170F4AB, 0x3971ED50550C43C1,
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0x7B810CBBFCE67552, 0xBC902E8706D82EE7, 0xFE60CF6CAF321874,
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0xE224479F47CB76A0, 0xA0D4A674EE214033, 0x67C58448141F1B86,
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0x253565A3BDF52D15, 0xAB1721DA49899A7F, 0xE9E7C031E063ACEC,
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0x2EF6E20D1A5DF759, 0x6C0603E6B3B7C1CA, 0xF6FAE5C07D3274CD,
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0xB40A042BD4D8425E, 0x731B26172EE619EB, 0x31EBC7FC870C2F78,
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0xBFC9838573709812, 0xFD39626EDA9AAE81, 0x3A28405220A4F534,
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0x78D8A1B9894EC3A7, 0x649C294A61B7AD73, 0x266CC8A1C85D9BE0,
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0xE17DEA9D3263C055, 0xA38D0B769B89F6C6, 0x2DAF4F0F6FF541AC,
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0x6F5FAEE4C61F773F, 0xA84E8CD83C212C8A, 0xEABE6D3395CB1A19,
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0x90C79D3FEDD3F122, 0xD2377CD44439C7B1, 0x15265EE8BE079C04,
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0x57D6BF0317EDAA97, 0xD9F4FB7AE3911DFD, 0x9B041A914A7B2B6E,
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0x5C1538ADB04570DB, 0x1EE5D94619AF4648, 0x02A151B5F156289C,
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0x4051B05E58BC1E0F, 0x87409262A28245BA, 0xC5B073890B687329,
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0x4B9237F0FF14C443, 0x0962D61B56FEF2D0, 0xCE73F427ACC0A965,
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0x8C8315CC052A9FF6, 0x3A80143F5CF17F13, 0x7870F5D4F51B4980,
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0xBF61D7E80F251235, 0xFD913603A6CF24A6, 0x73B3727A52B393CC,
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0x31439391FB59A55F, 0xF652B1AD0167FEEA, 0xB4A25046A88DC879,
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0xA8E6D8B54074A6AD, 0xEA16395EE99E903E, 0x2D071B6213A0CB8B,
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0x6FF7FA89BA4AFD18, 0xE1D5BEF04E364A72, 0xA3255F1BE7DC7CE1,
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0x64347D271DE22754, 0x26C49CCCB40811C7, 0x5CBD6CC0CC10FAFC,
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0x1E4D8D2B65FACC6F, 0xD95CAF179FC497DA, 0x9BAC4EFC362EA149,
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0x158E0A85C2521623, 0x577EEB6E6BB820B0, 0x906FC95291867B05,
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0xD29F28B9386C4D96, 0xCEDBA04AD0952342, 0x8C2B41A1797F15D1,
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0x4B3A639D83414E64, 0x09CA82762AAB78F7, 0x87E8C60FDED7CF9D,
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0xC51827E4773DF90E, 0x020905D88D03A2BB, 0x40F9E43324E99428,
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0x2CFFE7D5975E55E2, 0x6E0F063E3EB46371, 0xA91E2402C48A38C4,
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0xEBEEC5E96D600E57, 0x65CC8190991CB93D, 0x273C607B30F68FAE,
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0xE02D4247CAC8D41B, 0xA2DDA3AC6322E288, 0xBE992B5F8BDB8C5C,
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0xFC69CAB42231BACF, 0x3B78E888D80FE17A, 0x7988096371E5D7E9,
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0xF7AA4D1A85996083, 0xB55AACF12C735610, 0x724B8ECDD64D0DA5,
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0x30BB6F267FA73B36, 0x4AC29F2A07BFD00D, 0x08327EC1AE55E69E,
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0xCF235CFD546BBD2B, 0x8DD3BD16FD818BB8, 0x03F1F96F09FD3CD2,
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0x41011884A0170A41, 0x86103AB85A2951F4, 0xC4E0DB53F3C36767,
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0xD8A453A01B3A09B3, 0x9A54B24BB2D03F20, 0x5D45907748EE6495,
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0x1FB5719CE1045206, 0x919735E51578E56C, 0xD367D40EBC92D3FF,
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0x1476F63246AC884A, 0x568617D9EF46BED9, 0xE085162AB69D5E3C,
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0xA275F7C11F7768AF, 0x6564D5FDE549331A, 0x279434164CA30589,
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0xA9B6706FB8DFB2E3, 0xEB46918411358470, 0x2C57B3B8EB0BDFC5,
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0x6EA7525342E1E956, 0x72E3DAA0AA188782, 0x30133B4B03F2B111,
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0xF7021977F9CCEAA4, 0xB5F2F89C5026DC37, 0x3BD0BCE5A45A6B5D,
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0x79205D0E0DB05DCE, 0xBE317F32F78E067B, 0xFCC19ED95E6430E8,
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0x86B86ED5267CDBD3, 0xC4488F3E8F96ED40, 0x0359AD0275A8B6F5,
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0x41A94CE9DC428066, 0xCF8B0890283E370C, 0x8D7BE97B81D4019F,
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0x4A6ACB477BEA5A2A, 0x089A2AACD2006CB9, 0x14DEA25F3AF9026D,
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0x562E43B4931334FE, 0x913F6188692D6F4B, 0xD3CF8063C0C759D8,
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0x5DEDC41A34BBEEB2, 0x1F1D25F19D51D821, 0xD80C07CD676F8394,
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0x9AFCE626CE85B507
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};
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uint64_t bch_crc64_update(uint64_t crc, const void *_data, size_t len)
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{
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const unsigned char *data = _data;
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while (len--) {
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int i = ((int) (crc >> 56) ^ *data++) & 0xFF;
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crc = crc_table[i] ^ (crc << 8);
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}
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|
|
return crc;
|
|
}
|
|
|
|
uint64_t bch_crc64(const void *data, size_t len)
|
|
{
|
|
uint64_t crc = 0xffffffffffffffff;
|
|
|
|
crc = bch_crc64_update(crc, data, len);
|
|
|
|
return crc ^ 0xffffffffffffffff;
|
|
}
|