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#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <linux/fs.h>
#include <math.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <uuid/uuid.h>
#include "ccan/crc/crc.h"
#include "linux/bcache-ioctl.h"
#include "linux/sort.h"
#include "tools-util.h"
#include "util.h"
/* Integer stuff: */
struct units_buf __pr_units(u64 v, enum units units)
{
struct units_buf ret;
switch (units) {
case BYTES:
snprintf(ret.b, sizeof(ret.b), "%llu", v << 9);
break;
case SECTORS:
snprintf(ret.b, sizeof(ret.b), "%llu", v);
break;
case HUMAN_READABLE:
v <<= 9;
if (v >= 1024) {
int exp = log(v) / log(1024);
snprintf(ret.b, sizeof(ret.b), "%.1f%c",
v / pow(1024, exp),
"KMGTPE"[exp-1]);
} else {
snprintf(ret.b, sizeof(ret.b), "%llu", v);
}
break;
}
return ret;
}
/* Argument parsing stuff: */
/* File parsing (i.e. sysfs) */
char *read_file_str(int dirfd, const char *path)
{
int fd = xopenat(dirfd, path, O_RDONLY);
size_t len = xfstat(fd).st_size;
char *buf = malloc(len + 1);
xpread(fd, buf, len, 0);
buf[len] = '\0';
if (len && buf[len - 1] == '\n')
buf[len - 1] = '\0';
close(fd);
return buf;
}
u64 read_file_u64(int dirfd, const char *path)
{
char *buf = read_file_str(dirfd, path);
u64 ret = strtoll(buf, NULL, 10);
free(buf);
return ret;
}
/* String list options: */
ssize_t read_string_list_or_die(const char *opt, const char * const list[],
const char *msg)
{
ssize_t v = bch_read_string_list(opt, list);
if (v < 0)
die("Bad %s %s", msg, opt);
return v;
}
/* Returns size of file or block device: */
u64 get_size(const char *path, int fd)
{
struct stat statbuf = xfstat(fd);
if (!S_ISBLK(statbuf.st_mode))
return statbuf.st_size;
u64 ret;
xioctl(fd, BLKGETSIZE64, &ret);
return ret;
}
/* Returns blocksize in units of 512 byte sectors: */
unsigned get_blocksize(const char *path, int fd)
{
struct stat statbuf = xfstat(fd);
if (!S_ISBLK(statbuf.st_mode))
return statbuf.st_blksize >> 9;
unsigned ret;
xioctl(fd, BLKPBSZGET, &ret);
return ret >> 9;
}
/* Global control device: */
int bcachectl_open(void)
{
return xopen("/dev/bcache-ctl", O_RDWR);
}
/* Filesystem handles (ioctl, sysfs dir): */
#define SYSFS_BASE "/sys/fs/bcache/"
struct bcache_handle bcache_fs_open(const char *path)
{
struct bcache_handle ret;
uuid_t tmp;
if (!uuid_parse(path, tmp)) {
/* It's a UUID, look it up in sysfs: */
char *sysfs = mprintf("%s%s", SYSFS_BASE, path);
ret.sysfs_fd = xopen(sysfs, O_RDONLY);
char *minor = read_file_str(ret.sysfs_fd, "minor");
char *ctl = mprintf("/dev/bcache%s-ctl", minor);
ret.ioctl_fd = xopen(ctl, O_RDWR);
free(sysfs);
free(minor);
free(ctl);
} else {
/* It's a path: */
ret.ioctl_fd = xopen(path, O_RDONLY);
struct bch_ioctl_query_uuid uuid;
xioctl(ret.ioctl_fd, BCH_IOCTL_QUERY_UUID, &uuid);
char uuid_str[40];
uuid_unparse(uuid.uuid.b, uuid_str);
char *sysfs = mprintf("%s%s", SYSFS_BASE, uuid_str);
ret.sysfs_fd = xopen(sysfs, O_RDONLY);
free(sysfs);
}
return ret;
}
bool ask_yn(void)
{
const char *short_yes = "yY";
char *buf = NULL;
size_t buflen = 0;
bool ret;
fputs(" (y,n) ", stdout);
fflush(stdout);
if (getline(&buf, &buflen, stdin) < 0)
die("error reading from standard input");
ret = strchr(short_yes, buf[0]);
free(buf);
return ret;
}
static int range_cmp(const void *_l, const void *_r)
{
const struct range *l = _l, *r = _r;
if (l->start < r->start)
return -1;
if (l->start > r->start)
return 1;
return 0;
}
void ranges_sort_merge(ranges *r)
{
struct range *t, *i;
ranges tmp = { NULL };
sort(&darray_item(*r, 0), darray_size(*r),
sizeof(darray_item(*r, 0)), range_cmp, NULL);
/* Merge contiguous ranges: */
darray_foreach(i, *r) {
t = tmp.size ? &tmp.item[tmp.size - 1] : NULL;
if (t && t->end >= i->start)
t->end = max(t->end, i->end);
else
darray_append(tmp, *i);
}
darray_free(*r);
*r = tmp;
}
void ranges_roundup(ranges *r, unsigned block_size)
{
struct range *i;
darray_foreach(i, *r) {
i->start = round_down(i->start, block_size);
i->end = round_up(i->end, block_size);
}
}
void ranges_rounddown(ranges *r, unsigned block_size)
{
struct range *i;
darray_foreach(i, *r) {
i->start = round_up(i->start, block_size);
i->end = round_down(i->end, block_size);
i->end = max(i->end, i->start);
}
}
struct fiemap_extent fiemap_iter_next(struct fiemap_iter *iter)
{
struct fiemap_extent e;
BUG_ON(iter->idx > iter->f.fm_mapped_extents);
if (iter->idx == iter->f.fm_mapped_extents) {
xioctl(iter->fd, FS_IOC_FIEMAP, &iter->f);
if (!iter->f.fm_mapped_extents)
return (struct fiemap_extent) { .fe_length = 0 };
iter->idx = 0;
}
e = iter->f.fm_extents[iter->idx++];
BUG_ON(!e.fe_length);
iter->f.fm_start = e.fe_logical + e.fe_length;
return e;
}
const char *strcmp_prefix(const char *a, const char *a_prefix)
{
while (*a_prefix && *a == *a_prefix) {
a++;
a_prefix++;
}
return *a_prefix ? NULL : a;
}
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