mirror of https://gitee.com/openkylin/linux.git
413 lines
14 KiB
C
413 lines
14 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 <linux/sched/clock.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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/* fall through */ \
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case 'e': \
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u++; \
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/* fall through */ \
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case 'p': \
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u++; \
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/* fall through */ \
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case 't': \
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u++; \
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/* fall through */ \
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case 'g': \
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u++; \
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/* fall through */ \
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case 'm': \
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u++; \
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/* fall through */ \
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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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/* fall through */ \
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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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/**
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* bch_hprint - formats @v to human readable string for sysfs.
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* @buf: the (at least 8 byte) buffer to format the result into.
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* @v: signed 64 bit integer
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*
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* Returns the number of bytes used by format.
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*/
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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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int u = 0, t;
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uint64_t q;
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if (v < 0)
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q = -v;
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else
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q = v;
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/* For as long as the number is more than 3 digits, but at least
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* once, shift right / divide by 1024. Keep the remainder for
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* a digit after the decimal point.
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*/
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do {
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u++;
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t = q & ~(~0 << 10);
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q >>= 10;
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} while (q >= 1000);
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if (v < 0)
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/* '-', up to 3 digits, '.', 1 digit, 1 character, null;
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* yields 8 bytes.
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*/
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return sprintf(buf, "-%llu.%i%c", q, t * 10 / 1024, units[u]);
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else
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return sprintf(buf, "%llu.%i%c", q, t * 10 / 1024, units[u]);
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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, duration, last;
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spin_lock(&stats->lock);
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now = local_clock();
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duration = time_after64(now, start_time)
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? now - start_time : 0;
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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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spin_unlock(&stats->lock);
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}
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/**
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* bch_next_delay() - update ratelimiting statistics and calculate next delay
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* @d: the struct bch_ratelimit to update
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* @done: the amount of work done, in arbitrary units
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*
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* Increment @d by the amount of work done, and return how long to delay in
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* jiffies until the next time to do some work.
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*/
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uint64_t bch_next_delay(struct bch_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 * NSEC_PER_SEC, d->rate);
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/* Bound the time. Don't let us fall further than 2 seconds behind
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* (this prevents unnecessary backlog that would make it impossible
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* to catch up). If we're ahead of the desired writeback rate,
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* don't let us sleep more than 2.5 seconds (so we can notice/respond
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* if the control system tells us to speed up!).
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*/
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if (time_before64(now + NSEC_PER_SEC * 5LLU / 2LLU, d->next))
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d->next = now + NSEC_PER_SEC * 5LLU / 2LLU;
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if (time_after64(now - NSEC_PER_SEC * 2, d->next))
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d->next = now - NSEC_PER_SEC * 2;
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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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/*
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* Generally it isn't good to access .bi_io_vec and .bi_vcnt directly,
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* the preferred way is bio_add_page, but in this case, bch_bio_map()
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* supposes that the bvec table is empty, so it is safe to access
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* .bi_vcnt & .bi_io_vec in this way even after multipage bvec is
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* supported.
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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_iter.bi_size;
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struct bio_vec *bv = bio->bi_io_vec;
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BUG_ON(!bio->bi_iter.bi_size);
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BUG_ON(bio->bi_vcnt);
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bv->bv_offset = base ? offset_in_page(base) : 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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/**
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* bch_bio_alloc_pages - allocates a single page for each bvec in a bio
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* @bio: bio to allocate pages for
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* @gfp_mask: flags for allocation
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*
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* Allocates pages up to @bio->bi_vcnt.
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*
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* Returns 0 on success, -ENOMEM on failure. On failure, any allocated pages are
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* freed.
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*/
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int bch_bio_alloc_pages(struct bio *bio, gfp_t gfp_mask)
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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_all(bv, bio, i) {
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bv->bv_page = alloc_page(gfp_mask);
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if (!bv->bv_page) {
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while (--bv >= bio->bi_io_vec)
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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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0x0000000000000000ULL, 0x42F0E1EBA9EA3693ULL, 0x85E1C3D753D46D26ULL,
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0xC711223CFA3E5BB5ULL, 0x493366450E42ECDFULL, 0x0BC387AEA7A8DA4CULL,
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0xCCD2A5925D9681F9ULL, 0x8E224479F47CB76AULL, 0x9266CC8A1C85D9BEULL,
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0xD0962D61B56FEF2DULL, 0x17870F5D4F51B498ULL, 0x5577EEB6E6BB820BULL,
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0xDB55AACF12C73561ULL, 0x99A54B24BB2D03F2ULL, 0x5EB4691841135847ULL,
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0x1C4488F3E8F96ED4ULL, 0x663D78FF90E185EFULL, 0x24CD9914390BB37CULL,
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0xE3DCBB28C335E8C9ULL, 0xA12C5AC36ADFDE5AULL, 0x2F0E1EBA9EA36930ULL,
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0x6DFEFF5137495FA3ULL, 0xAAEFDD6DCD770416ULL, 0xE81F3C86649D3285ULL,
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0xF45BB4758C645C51ULL, 0xB6AB559E258E6AC2ULL, 0x71BA77A2DFB03177ULL,
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0x334A9649765A07E4ULL, 0xBD68D2308226B08EULL, 0xFF9833DB2BCC861DULL,
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0x388911E7D1F2DDA8ULL, 0x7A79F00C7818EB3BULL, 0xCC7AF1FF21C30BDEULL,
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0x8E8A101488293D4DULL, 0x499B3228721766F8ULL, 0x0B6BD3C3DBFD506BULL,
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0x854997BA2F81E701ULL, 0xC7B97651866BD192ULL, 0x00A8546D7C558A27ULL,
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0x4258B586D5BFBCB4ULL, 0x5E1C3D753D46D260ULL, 0x1CECDC9E94ACE4F3ULL,
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0xDBFDFEA26E92BF46ULL, 0x990D1F49C77889D5ULL, 0x172F5B3033043EBFULL,
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0x55DFBADB9AEE082CULL, 0x92CE98E760D05399ULL, 0xD03E790CC93A650AULL,
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0xAA478900B1228E31ULL, 0xE8B768EB18C8B8A2ULL, 0x2FA64AD7E2F6E317ULL,
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0x6D56AB3C4B1CD584ULL, 0xE374EF45BF6062EEULL, 0xA1840EAE168A547DULL,
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0x66952C92ECB40FC8ULL, 0x2465CD79455E395BULL, 0x3821458AADA7578FULL,
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0x7AD1A461044D611CULL, 0xBDC0865DFE733AA9ULL, 0xFF3067B657990C3AULL,
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0x711223CFA3E5BB50ULL, 0x33E2C2240A0F8DC3ULL, 0xF4F3E018F031D676ULL,
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0xB60301F359DBE0E5ULL, 0xDA050215EA6C212FULL, 0x98F5E3FE438617BCULL,
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0x5FE4C1C2B9B84C09ULL, 0x1D14202910527A9AULL, 0x93366450E42ECDF0ULL,
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0xD1C685BB4DC4FB63ULL, 0x16D7A787B7FAA0D6ULL, 0x5427466C1E109645ULL,
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0x4863CE9FF6E9F891ULL, 0x0A932F745F03CE02ULL, 0xCD820D48A53D95B7ULL,
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0x8F72ECA30CD7A324ULL, 0x0150A8DAF8AB144EULL, 0x43A04931514122DDULL,
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0x84B16B0DAB7F7968ULL, 0xC6418AE602954FFBULL, 0xBC387AEA7A8DA4C0ULL,
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0xFEC89B01D3679253ULL, 0x39D9B93D2959C9E6ULL, 0x7B2958D680B3FF75ULL,
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0xF50B1CAF74CF481FULL, 0xB7FBFD44DD257E8CULL, 0x70EADF78271B2539ULL,
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0x321A3E938EF113AAULL, 0x2E5EB66066087D7EULL, 0x6CAE578BCFE24BEDULL,
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0xABBF75B735DC1058ULL, 0xE94F945C9C3626CBULL, 0x676DD025684A91A1ULL,
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0x259D31CEC1A0A732ULL, 0xE28C13F23B9EFC87ULL, 0xA07CF2199274CA14ULL,
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0x167FF3EACBAF2AF1ULL, 0x548F120162451C62ULL, 0x939E303D987B47D7ULL,
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0xD16ED1D631917144ULL, 0x5F4C95AFC5EDC62EULL, 0x1DBC74446C07F0BDULL,
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0xDAAD56789639AB08ULL, 0x985DB7933FD39D9BULL, 0x84193F60D72AF34FULL,
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0xC6E9DE8B7EC0C5DCULL, 0x01F8FCB784FE9E69ULL, 0x43081D5C2D14A8FAULL,
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0xCD2A5925D9681F90ULL, 0x8FDAB8CE70822903ULL, 0x48CB9AF28ABC72B6ULL,
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0x0A3B7B1923564425ULL, 0x70428B155B4EAF1EULL, 0x32B26AFEF2A4998DULL,
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0xF5A348C2089AC238ULL, 0xB753A929A170F4ABULL, 0x3971ED50550C43C1ULL,
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0x7B810CBBFCE67552ULL, 0xBC902E8706D82EE7ULL, 0xFE60CF6CAF321874ULL,
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0xE224479F47CB76A0ULL, 0xA0D4A674EE214033ULL, 0x67C58448141F1B86ULL,
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0x253565A3BDF52D15ULL, 0xAB1721DA49899A7FULL, 0xE9E7C031E063ACECULL,
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0x2EF6E20D1A5DF759ULL, 0x6C0603E6B3B7C1CAULL, 0xF6FAE5C07D3274CDULL,
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0xB40A042BD4D8425EULL, 0x731B26172EE619EBULL, 0x31EBC7FC870C2F78ULL,
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0xBFC9838573709812ULL, 0xFD39626EDA9AAE81ULL, 0x3A28405220A4F534ULL,
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0x78D8A1B9894EC3A7ULL, 0x649C294A61B7AD73ULL, 0x266CC8A1C85D9BE0ULL,
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0xE17DEA9D3263C055ULL, 0xA38D0B769B89F6C6ULL, 0x2DAF4F0F6FF541ACULL,
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0x6F5FAEE4C61F773FULL, 0xA84E8CD83C212C8AULL, 0xEABE6D3395CB1A19ULL,
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0x90C79D3FEDD3F122ULL, 0xD2377CD44439C7B1ULL, 0x15265EE8BE079C04ULL,
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0x57D6BF0317EDAA97ULL, 0xD9F4FB7AE3911DFDULL, 0x9B041A914A7B2B6EULL,
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0x5C1538ADB04570DBULL, 0x1EE5D94619AF4648ULL, 0x02A151B5F156289CULL,
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0x4051B05E58BC1E0FULL, 0x87409262A28245BAULL, 0xC5B073890B687329ULL,
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0x4B9237F0FF14C443ULL, 0x0962D61B56FEF2D0ULL, 0xCE73F427ACC0A965ULL,
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0x8C8315CC052A9FF6ULL, 0x3A80143F5CF17F13ULL, 0x7870F5D4F51B4980ULL,
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0xBF61D7E80F251235ULL, 0xFD913603A6CF24A6ULL, 0x73B3727A52B393CCULL,
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0x31439391FB59A55FULL, 0xF652B1AD0167FEEAULL, 0xB4A25046A88DC879ULL,
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0xA8E6D8B54074A6ADULL, 0xEA16395EE99E903EULL, 0x2D071B6213A0CB8BULL,
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0x6FF7FA89BA4AFD18ULL, 0xE1D5BEF04E364A72ULL, 0xA3255F1BE7DC7CE1ULL,
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0x64347D271DE22754ULL, 0x26C49CCCB40811C7ULL, 0x5CBD6CC0CC10FAFCULL,
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0x1E4D8D2B65FACC6FULL, 0xD95CAF179FC497DAULL, 0x9BAC4EFC362EA149ULL,
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0x158E0A85C2521623ULL, 0x577EEB6E6BB820B0ULL, 0x906FC95291867B05ULL,
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0xD29F28B9386C4D96ULL, 0xCEDBA04AD0952342ULL, 0x8C2B41A1797F15D1ULL,
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0x4B3A639D83414E64ULL, 0x09CA82762AAB78F7ULL, 0x87E8C60FDED7CF9DULL,
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0xC51827E4773DF90EULL, 0x020905D88D03A2BBULL, 0x40F9E43324E99428ULL,
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0x2CFFE7D5975E55E2ULL, 0x6E0F063E3EB46371ULL, 0xA91E2402C48A38C4ULL,
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0xEBEEC5E96D600E57ULL, 0x65CC8190991CB93DULL, 0x273C607B30F68FAEULL,
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0xE02D4247CAC8D41BULL, 0xA2DDA3AC6322E288ULL, 0xBE992B5F8BDB8C5CULL,
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0xFC69CAB42231BACFULL, 0x3B78E888D80FE17AULL, 0x7988096371E5D7E9ULL,
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0xF7AA4D1A85996083ULL, 0xB55AACF12C735610ULL, 0x724B8ECDD64D0DA5ULL,
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0x30BB6F267FA73B36ULL, 0x4AC29F2A07BFD00DULL, 0x08327EC1AE55E69EULL,
|
|
0xCF235CFD546BBD2BULL, 0x8DD3BD16FD818BB8ULL, 0x03F1F96F09FD3CD2ULL,
|
|
0x41011884A0170A41ULL, 0x86103AB85A2951F4ULL, 0xC4E0DB53F3C36767ULL,
|
|
0xD8A453A01B3A09B3ULL, 0x9A54B24BB2D03F20ULL, 0x5D45907748EE6495ULL,
|
|
0x1FB5719CE1045206ULL, 0x919735E51578E56CULL, 0xD367D40EBC92D3FFULL,
|
|
0x1476F63246AC884AULL, 0x568617D9EF46BED9ULL, 0xE085162AB69D5E3CULL,
|
|
0xA275F7C11F7768AFULL, 0x6564D5FDE549331AULL, 0x279434164CA30589ULL,
|
|
0xA9B6706FB8DFB2E3ULL, 0xEB46918411358470ULL, 0x2C57B3B8EB0BDFC5ULL,
|
|
0x6EA7525342E1E956ULL, 0x72E3DAA0AA188782ULL, 0x30133B4B03F2B111ULL,
|
|
0xF7021977F9CCEAA4ULL, 0xB5F2F89C5026DC37ULL, 0x3BD0BCE5A45A6B5DULL,
|
|
0x79205D0E0DB05DCEULL, 0xBE317F32F78E067BULL, 0xFCC19ED95E6430E8ULL,
|
|
0x86B86ED5267CDBD3ULL, 0xC4488F3E8F96ED40ULL, 0x0359AD0275A8B6F5ULL,
|
|
0x41A94CE9DC428066ULL, 0xCF8B0890283E370CULL, 0x8D7BE97B81D4019FULL,
|
|
0x4A6ACB477BEA5A2AULL, 0x089A2AACD2006CB9ULL, 0x14DEA25F3AF9026DULL,
|
|
0x562E43B4931334FEULL, 0x913F6188692D6F4BULL, 0xD3CF8063C0C759D8ULL,
|
|
0x5DEDC41A34BBEEB2ULL, 0x1F1D25F19D51D821ULL, 0xD80C07CD676F8394ULL,
|
|
0x9AFCE626CE85B507ULL,
|
|
};
|
|
|
|
uint64_t bch_crc64_update(uint64_t crc, const void *_data, size_t len)
|
|
{
|
|
const unsigned char *data = _data;
|
|
|
|
while (len--) {
|
|
int i = ((int) (crc >> 56) ^ *data++) & 0xFF;
|
|
crc = crc_table[i] ^ (crc << 8);
|
|
}
|
|
|
|
return crc;
|
|
}
|
|
|
|
uint64_t bch_crc64(const void *data, size_t len)
|
|
{
|
|
uint64_t crc = 0xffffffffffffffffULL;
|
|
|
|
crc = bch_crc64_update(crc, data, len);
|
|
|
|
return crc ^ 0xffffffffffffffffULL;
|
|
}
|