/*
* Given the root disk device name, read the label from
* the device, and construct a configuration nvlist.
*/
int
vdev_disk_read_rootlabel(char *devname, nvlist_t **config)
{
vdev_label_t *label;
struct device *dev;
uint64_t size;
int l;
int error = -1;
char *minor_name;
error = device_open(devname + 5, DO_RDWR, &dev);
if (error)
return error;
size = P2ALIGN_TYPED(dev->size, sizeof (vdev_label_t), uint64_t);
label = kmem_alloc(sizeof (vdev_label_t), KM_SLEEP);
*config = NULL;
for (l = 0; l < VDEV_LABELS; l++) {
uint64_t offset, state, txg = 0;
/* read vdev label */
offset = vdev_label_offset(size, l, 0);
if (vdev_disk_physio(dev, (caddr_t)label,
VDEV_SKIP_SIZE + VDEV_PHYS_SIZE, offset, 0) != 0)
continue;
if (nvlist_unpack(label->vl_vdev_phys.vp_nvlist,
sizeof (label->vl_vdev_phys.vp_nvlist), config, 0) != 0) {
*config = NULL;
continue;
}
if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_STATE,
&state) != 0 || state >= POOL_STATE_DESTROYED) {
nvlist_free(*config);
*config = NULL;
continue;
}
if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_TXG,
&txg) != 0 || txg == 0) {
nvlist_free(*config);
*config = NULL;
continue;
}
break;
}
kmem_free(label, sizeof (vdev_label_t));
device_close(dev);
if (*config == NULL)
error = EIDRM;
return (error);
}
/*
* Given the root disk device devid or pathname, read the label from
* the device, and construct a configuration nvlist.
*/
int
vdev_disk_read_rootlabel(char *devpath, char *devid, nvlist_t **config)
{
ldi_handle_t vd_lh;
vdev_label_t *label;
uint64_t s, size;
int l;
ddi_devid_t tmpdevid;
int error = -1;
char *minor_name;
/*
* Read the device label and build the nvlist.
*/
if (devid != NULL && ddi_devid_str_decode(devid, &tmpdevid,
&minor_name) == 0) {
error = ldi_open_by_devid(tmpdevid, minor_name,
FREAD, kcred, &vd_lh, zfs_li);
ddi_devid_free(tmpdevid);
ddi_devid_str_free(minor_name);
}
if (error && (error = ldi_open_by_name(devpath, FREAD, kcred, &vd_lh,
zfs_li)))
return (error);
if (ldi_get_size(vd_lh, &s)) {
(void) ldi_close(vd_lh, FREAD, kcred);
return (EIO);
}
size = P2ALIGN_TYPED(s, sizeof (vdev_label_t), uint64_t);
label = kmem_alloc(sizeof (vdev_label_t), KM_SLEEP);
*config = NULL;
for (l = 0; l < VDEV_LABELS; l++) {
uint64_t offset, state, txg = 0;
/* read vdev label */
offset = vdev_label_offset(size, l, 0);
if (vdev_disk_physio(vd_lh, (caddr_t)label,
VDEV_SKIP_SIZE + VDEV_PHYS_SIZE, offset, B_READ) != 0)
continue;
if (nvlist_unpack(label->vl_vdev_phys.vp_nvlist,
sizeof (label->vl_vdev_phys.vp_nvlist), config, 0) != 0) {
*config = NULL;
continue;
}
if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_STATE,
&state) != 0 || state >= POOL_STATE_DESTROYED) {
nvlist_free(*config);
*config = NULL;
continue;
}
if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_TXG,
&txg) != 0 || txg == 0) {
nvlist_free(*config);
*config = NULL;
continue;
}
break;
}
kmem_free(label, sizeof (vdev_label_t));
(void) ldi_close(vd_lh, FREAD, kcred);
if (*config == NULL)
error = EIDRM;
return (error);
}
