linux/drivers/md/bcache/util.c

// SPDX-License-Identifier: GPL-2.0
/*
 * random utility code, for bcache but in theory not specific to bcache
 *
 * Copyright 2010, 2011 Kent Overstreet <[email protected]>
 * Copyright 2012 Google, Inc.
 */

#include <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/ctype.h>
#include <linux/debugfs.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/types.h>
#include <linux/sched/clock.h>

#include "util.h"

#define simple_strtoint(c, end, base) …
#define simple_strtouint(c, end, base) …

#define STRTO_H(name, type) …								\

STRTO_H(…)
STRTO_H(…)
STRTO_H(…)
STRTO_H(…)

/**
 * bch_hprint - formats @v to human readable string for sysfs.
 * @buf: the (at least 8 byte) buffer to format the result into.
 * @v: signed 64 bit integer
 *
 * Returns the number of bytes used by format.
 */
ssize_t bch_hprint(char *buf, int64_t v)
{ … }

bool bch_is_zero(const char *p, size_t n)
{ … }

int bch_parse_uuid(const char *s, char *uuid)
{ … }

void bch_time_stats_update(struct time_stats *stats, uint64_t start_time)
{ … }

/**
 * bch_next_delay() - update ratelimiting statistics and calculate next delay
 * @d: the struct bch_ratelimit to update
 * @done: the amount of work done, in arbitrary units
 *
 * Increment @d by the amount of work done, and return how long to delay in
 * jiffies until the next time to do some work.
 */
uint64_t bch_next_delay(struct bch_ratelimit *d, uint64_t done)
{ … }

/*
 * Generally it isn't good to access .bi_io_vec and .bi_vcnt directly,
 * the preferred way is bio_add_page, but in this case, bch_bio_map()
 * supposes that the bvec table is empty, so it is safe to access
 * .bi_vcnt & .bi_io_vec in this way even after multipage bvec is
 * supported.
 */
void bch_bio_map(struct bio *bio, void *base)
{ … }

/**
 * bch_bio_alloc_pages - allocates a single page for each bvec in a bio
 * @bio: bio to allocate pages for
 * @gfp_mask: flags for allocation
 *
 * Allocates pages up to @bio->bi_vcnt.
 *
 * Returns 0 on success, -ENOMEM on failure. On failure, any allocated pages are
 * freed.
 */
int bch_bio_alloc_pages(struct bio *bio, gfp_t gfp_mask)
{ … }