static int get_partition_start(int fd, int partno, uint64_t *start)
{
struct stat st;
struct sysfs_cxt disk = UL_SYSFSCXT_EMPTY,
part = UL_SYSFSCXT_EMPTY;
dev_t devno = 0;
int rc = -1;
/*
* wholedisk
*/
if (fstat(fd, &st) || !S_ISBLK(st.st_mode))
goto done;
devno = st.st_rdev;
if (sysfs_init(&disk, devno, NULL))
goto done;
/*
* partition
*/
devno = sysfs_partno_to_devno(&disk, partno);
if (!devno)
goto done;
if (sysfs_init(&part, devno, &disk))
goto done;
if (sysfs_read_u64(&part, "start", start))
goto done;
rc = 0;
done:
sysfs_deinit(&part);
sysfs_deinit(&disk);
return rc;
}
static int has_discard(const char *devname, struct sysfs_cxt *wholedisk)
{
struct sysfs_cxt cxt, *parent = NULL;
uint64_t dg = 0;
dev_t disk = 0, dev;
int rc;
dev = sysfs_devname_to_devno(devname, NULL);
if (!dev)
return 1;
/*
* This is tricky to read the info from sys/, because the queue
* atrributes are provided for whole devices (disk) only. We're trying
* to reuse the whole-disk sysfs context to optimize this stuff (as
* system usually have just one disk only).
*/
if (sysfs_devno_to_wholedisk(dev, NULL, 0, &disk) || !disk)
return 1;
if (dev != disk) {
if (wholedisk->devno != disk) {
sysfs_deinit(wholedisk);
if (sysfs_init(wholedisk, disk, NULL))
return 1;
}
parent = wholedisk;
}
rc = sysfs_init(&cxt, dev, parent);
if (!rc)
rc = sysfs_read_u64(&cxt, "queue/discard_granularity", &dg);
sysfs_deinit(&cxt);
return rc == 0 && dg > 0;
}
/*
* Returns 1 if the device is private LVM device.
*/
int sysfs_devno_is_lvm_private(dev_t devno)
{
struct sysfs_cxt cxt = UL_SYSFSCXT_EMPTY;
char *uuid = NULL;
int rc = 0;
if (sysfs_init(&cxt, devno, NULL) != 0)
return 0;
uuid = sysfs_strdup(&cxt, "dm/uuid");
/* Private LVM devices use "LVM-<uuid>-<name>" uuid format (important
* is the "LVM" prefix and "-<name>" postfix).
*/
if (uuid && strncmp(uuid, "LVM-", 4) == 0) {
char *p = strrchr(uuid + 4, '-');
if (p && *(p + 1))
rc = 1;
}
sysfs_deinit(&cxt);
free(uuid);
return rc;
}
int sysfs_init(struct sysfs_cxt *cxt, dev_t devno, struct sysfs_cxt *parent)
{
char path[PATH_MAX];
int fd, rc;
memset(cxt, 0, sizeof(*cxt));
cxt->dir_fd = -1;
if (!sysfs_devno_path(devno, path, sizeof(path)))
goto err;
fd = open(path, O_RDONLY|O_CLOEXEC);
if (fd < 0)
goto err;
cxt->dir_fd = fd;
cxt->dir_path = strdup(path);
if (!cxt->dir_path)
goto err;
cxt->devno = devno;
cxt->parent = parent;
return 0;
err:
rc = errno > 0 ? -errno : -1;
sysfs_deinit(cxt);
return rc;
}
/*
* Returns devname (e.g. "/dev/sda1") for the given devno.
*
* Note that the @buf has to be large enough to store /sys/dev/block/<maj:min>
* symlinks.
*
* Please, use more robust blkid_devno_to_devname() in your applications.
*/
char *sysfs_devno_to_devpath(dev_t devno, char *buf, size_t bufsiz)
{
struct sysfs_cxt cxt;
char *name;
size_t sz;
struct stat st;
if (sysfs_init(&cxt, devno, NULL))
return NULL;
name = sysfs_get_devname(&cxt, buf, bufsiz);
sysfs_deinit(&cxt);
if (!name)
return NULL;
sz = strlen(name);
if (sz + sizeof("/dev/") > bufsiz)
return NULL;
/* create the final "/dev/<name>" string */
memmove(buf + 5, name, sz + 1);
memcpy(buf, "/dev/", 5);
if (!stat(buf, &st) && S_ISBLK(st.st_mode) && st.st_rdev == devno)
return buf;
return NULL;
}
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;
}
static int is_hotpluggable(const struct eject_control *ctl)
{
struct sysfs_cxt cxt = UL_SYSFSCXT_EMPTY;
dev_t devno;
int rc = 0;
devno = sysfs_devname_to_devno(ctl->device, NULL);
if (sysfs_init(&cxt, devno, NULL) != 0)
return 0;
rc = sysfs_is_hotpluggable(&cxt);
sysfs_deinit(&cxt);
return rc;
}
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;
}
static int umount_partitions(const char *disk, int checkonly)
{
struct sysfs_cxt cxt = UL_SYSFSCXT_EMPTY;
dev_t devno;
DIR *dir = NULL;
struct dirent *d;
int count = 0;
devno = sysfs_devname_to_devno(disk, NULL);
if (sysfs_init(&cxt, devno, NULL) != 0)
return 0;
/* open /sys/block/<wholedisk> */
if (!(dir = sysfs_opendir(&cxt, NULL)))
goto done;
/* scan for partition subdirs */
while ((d = readdir(dir))) {
if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
continue;
if (sysfs_is_partition_dirent(dir, d, disk)) {
char *mnt = NULL;
char *dev = find_device(d->d_name);
if (dev && device_get_mountpoint(&dev, &mnt) == 0) {
verbose(_("%s: mounted on %s"), dev, mnt);
if (!checkonly)
umount_one(mnt);
count++;
}
free(dev);
free(mnt);
}
}
done:
if (dir)
closedir(dir);
sysfs_deinit(&cxt);
return count;
}
/*
* @lc: context
* @device: device name, absolute device path or NULL to reset the current setting
*
* Sets device, absolute paths (e.g. "/dev/loop<N>") are unchanged, device
* names ("loop<N>") are converted to the path (/dev/loop<N> or to
* /dev/loop/<N>)
*
* Returns: <0 on error, 0 on success
*/
int loopcxt_set_device(struct loopdev_cxt *lc, const char *device)
{
if (!lc)
return -EINVAL;
if (lc->fd >= 0)
close(lc->fd);
lc->fd = -1;
lc->mode = 0;
lc->has_info = 0;
lc->info_failed = 0;
*lc->device = '\0';
memset(&lc->info, 0, sizeof(lc->info));
/* set new */
if (device) {
if (*device != '/') {
const char *dir = _PATH_DEV;
/* compose device name for /dev/loop<n> or /dev/loop/<n> */
if (lc->flags & LOOPDEV_FL_DEVSUBDIR) {
if (strlen(device) < 5)
return -1;
device += 4;
dir = _PATH_DEV_LOOP "/"; /* _PATH_DEV uses tailing slash */
}
snprintf(lc->device, sizeof(lc->device), "%s%s",
dir, device);
} else {
strncpy(lc->device, device, sizeof(lc->device));
lc->device[sizeof(lc->device) - 1] = '\0';
}
DBG(lc, loopdev_debug("%s successfully assigned", device));
}
sysfs_deinit(&lc->sysfs);
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;
}