int main(int argc, char *argv[])
{
struct sysfs_cxt cxt = UL_SYSFSCXT_EMPTY;
char *devname;
dev_t devno;
char path[PATH_MAX];
int i;
uint64_t u64;
ssize_t len;
if (argc != 2)
errx(EXIT_FAILURE, "usage: %s <devname>", argv[0]);
devname = argv[1];
devno = sysfs_devname_to_devno(devname, NULL);
if (!devno)
err(EXIT_FAILURE, "failed to read devno");
printf("NAME: %s\n", devname);
printf("DEVNO: %u\n", (unsigned int) devno);
printf("DEVNOPATH: %s\n", sysfs_devno_path(devno, path, sizeof(path)));
printf("DEVPATH: %s\n", sysfs_devno_to_devpath(devno, path, sizeof(path)));
printf("PARTITION: %s\n",
sysfs_devno_has_attribute(devno, "partition") ? "YES" : "NOT");
if (sysfs_init(&cxt, devno, NULL))
return EXIT_FAILURE;
len = sysfs_readlink(&cxt, NULL, path, sizeof(path) - 1);
if (len > 0) {
path[len] = '\0';
printf("DEVNOLINK: %s\n", path);
}
printf("SLAVES: %d\n", sysfs_count_dirents(&cxt, "slaves"));
if (sysfs_read_u64(&cxt, "size", &u64))
printf("read SIZE failed\n");
else
printf("SIZE: %jd\n", u64);
if (sysfs_read_int(&cxt, "queue/hw_sector_size", &i))
printf("read SECTOR failed\n");
else
printf("SECTOR: %d\n", i);
printf("DEVNAME: %s\n", sysfs_get_devname(&cxt, path, sizeof(path)));
sysfs_deinit(&cxt);
return EXIT_SUCCESS;
}
/*
* Returns complete path to the device, the patch contains all all sybsystems
* used for the device.
*/
char *sysfs_get_devchain(struct sysfs_cxt *cxt, char *buf, size_t bufsz)
{
/* read /sys/dev/block/<maj>:<min> symlink */
ssize_t sz = sysfs_readlink(cxt, NULL, buf, bufsz);
if (sz <= 0 || sz + sizeof(_PATH_SYS_DEVBLOCK "/") > bufsz)
return NULL;
buf[sz++] = '\0';
/* create absolute patch from the link */
memmove(buf + sizeof(_PATH_SYS_DEVBLOCK "/") - 1, buf, sz);
memcpy(buf, _PATH_SYS_DEVBLOCK "/", sizeof(_PATH_SYS_DEVBLOCK "/") - 1);
return buf;
}
static int is_hotpluggable(const char* device)
{
struct sysfs_cxt cxt = UL_SYSFSCXT_EMPTY;
char devchain[PATH_MAX];
char subbuf[PATH_MAX];
dev_t devno;
int rc = 0;
ssize_t sz;
char *sub;
devno = sysfs_devname_to_devno(device, NULL);
if (sysfs_init(&cxt, devno, NULL) != 0)
return 0;
/* check /sys/dev/block/<maj>:<min>/removable attribute */
if (sysfs_read_int(&cxt, "removable", &rc) == 0 && rc == 1) {
verbose(_("%s: is removable device"), device);
goto done;
}
/* read /sys/dev/block/<maj>:<min> symlink */
sz = sysfs_readlink(&cxt, NULL, devchain, sizeof(devchain));
if (sz <= 0 || sz + sizeof(_PATH_SYS_DEVBLOCK "/") > sizeof(devchain))
goto done;
devchain[sz++] = '\0';
/* create absolute patch from the link */
memmove(devchain + sizeof(_PATH_SYS_DEVBLOCK "/") - 1, devchain, sz);
memcpy(devchain, _PATH_SYS_DEVBLOCK "/",
sizeof(_PATH_SYS_DEVBLOCK "/") - 1);
while ((sub = get_subsystem(devchain, subbuf, sizeof(subbuf)))) {
rc = is_hotpluggable_subsystem(sub);
if (rc) {
verbose(_("%s: connected by hotplug subsystem: %s"),
device, sub);
break;
}
}
done:
sysfs_deinit(&cxt);
return rc;
}
/*
* Note that the @buf has to be large enough to store /sys/dev/block/<maj:min>
* symlinks.
*/
char *sysfs_get_devname(struct sysfs_cxt *cxt, char *buf, size_t bufsiz)
{
char *name = NULL;
ssize_t sz;
sz = sysfs_readlink(cxt, NULL, buf, bufsiz - 1);
if (sz < 0)
return NULL;
buf[sz] = '\0';
name = strrchr(buf, '/');
if (!name)
return NULL;
name++;
sz = strlen(name);
memmove(buf, name, sz + 1);
return buf;
}
int sysfs_scsi_get_hctl(struct sysfs_cxt *cxt, int *h, int *c, int *t, int *l)
{
char buf[PATH_MAX], *hctl;
ssize_t len;
if (!cxt)
return -EINVAL;
if (cxt->has_hctl)
goto done;
len = sysfs_readlink(cxt, "device", buf, sizeof(buf) - 1);
if (len < 0)
return len;
buf[len] = '\0';
hctl = strrchr(buf, '/');
if (!hctl)
return -1;
hctl++;
if (sscanf(hctl, "%u:%u:%u:%u", &cxt->scsi_host, &cxt->scsi_channel,
&cxt->scsi_target, &cxt->scsi_lun) != 4)
return -1;
cxt->has_hctl = 1;
done:
if (h)
*h = cxt->scsi_host;
if (c)
*c = cxt->scsi_channel;
if (t)
*t = cxt->scsi_target;
if (l)
*l = cxt->scsi_lun;
return 0;
}
/*
* Returns by @diskdevno whole disk device devno and (optionaly) by
* @diskname the whole disk device name.
*/
int sysfs_devno_to_wholedisk(dev_t dev, char *diskname,
size_t len, dev_t *diskdevno)
{
struct sysfs_cxt cxt;
int is_part = 0;
if (!dev || sysfs_init(&cxt, dev, NULL) != 0)
return -1;
is_part = sysfs_has_attribute(&cxt, "partition");
if (!is_part) {
/*
* Extra case for partitions mapped by device-mapper.
*
* All regualar partitions (added by BLKPG ioctl or kernel PT
* parser) have the /sys/.../partition file. The partitions
* mapped by DM don't have such file, but they have "part"
* prefix in DM UUID.
*/
char *uuid = sysfs_strdup(&cxt, "dm/uuid");
char *tmp = uuid;
char *prefix = uuid ? strsep(&tmp, "-") : NULL;
if (prefix && strncasecmp(prefix, "part", 4) == 0)
is_part = 1;
free(uuid);
if (is_part &&
get_dm_wholedisk(&cxt, diskname, len, diskdevno) == 0)
/*
* partitioned device, mapped by DM
*/
goto done;
is_part = 0;
}
if (!is_part) {
/*
* unpartitioned device
*/
if (diskname && len) {
if (!sysfs_get_devname(&cxt, diskname, len))
goto err;
}
if (diskdevno)
*diskdevno = dev;
} else {
/*
* partitioned device
* - readlink /sys/dev/block/8:1 = ../../block/sda/sda1
* - dirname ../../block/sda/sda1 = ../../block/sda
* - basename ../../block/sda = sda
*/
char linkpath[PATH_MAX];
char *name;
int linklen;
linklen = sysfs_readlink(&cxt, NULL,
linkpath, sizeof(linkpath) - 1);
if (linklen < 0)
goto err;
linkpath[linklen] = '\0';
stripoff_last_component(linkpath); /* dirname */
name = stripoff_last_component(linkpath); /* basename */
if (!name)
goto err;
if (diskname && len) {
strncpy(diskname, name, len);
diskname[len - 1] = '\0';
}
if (diskdevno) {
*diskdevno = sysfs_devname_to_devno(name, NULL);
if (!*diskdevno)
goto err;
}
}
done:
sysfs_deinit(&cxt);
return 0;
err:
sysfs_deinit(&cxt);
return -1;
}
