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#include <alloca.h>
#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 "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 = openat(dirfd, path, O_RDONLY);
if (fd < 0)
die("Unable to open %s\n", path);
struct stat statbuf;
if (fstat(fd, &statbuf) < 0)
die("fstat error\n");
char *buf = malloc(statbuf.st_size + 1);
int len = read(fd, buf, statbuf.st_size);
if (len < 0)
die("read error while reading from file %s\n", path);
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, in units of 512 byte sectors: */
u64 get_size(const char *path, int fd)
{
struct stat statbuf;
if (fstat(fd, &statbuf))
die("Error statting %s: %s", path, strerror(errno));
if (!S_ISBLK(statbuf.st_mode))
return statbuf.st_size >> 9;
u64 ret;
if (ioctl(fd, BLKGETSIZE64, &ret))
die("Error getting block device size on %s: %s\n",
path, strerror(errno));
return ret >> 9;
}
/* Returns blocksize in units of 512 byte sectors: */
unsigned get_blocksize(const char *path, int fd)
{
struct stat statbuf;
if (fstat(fd, &statbuf))
die("Error statting %s: %s", path, strerror(errno));
if (!S_ISBLK(statbuf.st_mode))
return statbuf.st_blksize >> 9;
unsigned ret;
if (ioctl(fd, BLKPBSZGET, &ret))
die("Error getting blocksize on %s: %s\n",
path, strerror(errno));
return ret >> 9;
}
/* Global control device: */
int bcachectl_open(void)
{
int fd = open("/dev/bcache-ctl", O_RDWR);
if (fd < 0)
die("Can't open bcache device: %s", strerror(errno));
return fd;
}
/* 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 = alloca(strlen(SYSFS_BASE) + strlen(path) + 1);
sprintf(sysfs, "%s%s", SYSFS_BASE, path);
ret.sysfs_fd = open(sysfs, O_RDONLY);
if (!ret.sysfs_fd)
die("Unable to open %s\n", path);
char *minor = read_file_str(ret.sysfs_fd, "minor");
char *ctl = alloca(20 + strlen(minor));
sprintf(ctl, "/dev/bcache%s-ctl", minor);
free(minor);
ret.ioctl_fd = open(ctl, O_RDWR);
if (ret.ioctl_fd < 0)
die("Error opening control device: %s\n",
strerror(errno));
} else {
/* It's a path: */
ret.ioctl_fd = open(path, O_RDONLY);
if (ret.ioctl_fd < 0)
die("Error opening %s: %s\n",
path, strerror(errno));
struct bch_ioctl_query_uuid uuid;
if (ioctl(ret.ioctl_fd, BCH_IOCTL_QUERY_UUID, &uuid))
die("ioctl error (not a bcache fs?): %s\n",
strerror(errno));
char uuid_str[40];
uuid_unparse(uuid.uuid.b, uuid_str);
char *sysfs = alloca(strlen(SYSFS_BASE) + strlen(uuid_str) + 1);
sprintf(sysfs, "%s%s", SYSFS_BASE, uuid_str);
ret.sysfs_fd = open(sysfs, O_RDONLY);
if (ret.sysfs_fd < 0)
die("Unable to open sysfs dir %s: %s\n",
sysfs, strerror(errno));
}
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;
}
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