zfs-builds-mm/zfs-0.8.0/lib/libzfs/libzfs_import.c

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2019-07-06 23:40:11 +02:00
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2015 Nexenta Systems, Inc. All rights reserved.
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012, 2018 by Delphix. All rights reserved.
* Copyright 2015 RackTop Systems.
* Copyright (c) 2016, Intel Corporation.
*/
#include <devid.h>
#include <errno.h>
#include <libintl.h>
#include <libgen.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/vdev_impl.h>
#include <libzfs.h>
#include <libzfs_impl.h>
#include <libzutil.h>
/*
* Returns true if the named pool matches the given GUID.
*/
static int
pool_active(libzfs_handle_t *hdl, const char *name, uint64_t guid,
boolean_t *isactive)
{
zpool_handle_t *zhp;
uint64_t theguid;
if (zpool_open_silent(hdl, name, &zhp) != 0)
return (-1);
if (zhp == NULL) {
*isactive = B_FALSE;
return (0);
}
verify(nvlist_lookup_uint64(zhp->zpool_config, ZPOOL_CONFIG_POOL_GUID,
&theguid) == 0);
zpool_close(zhp);
*isactive = (theguid == guid);
return (0);
}
static nvlist_t *
refresh_config(libzfs_handle_t *hdl, nvlist_t *config)
{
nvlist_t *nvl;
zfs_cmd_t zc = {"\0"};
int err, dstbuf_size;
if (zcmd_write_conf_nvlist(hdl, &zc, config) != 0)
return (NULL);
dstbuf_size = MAX(CONFIG_BUF_MINSIZE, zc.zc_nvlist_conf_size * 4);
if (zcmd_alloc_dst_nvlist(hdl, &zc, dstbuf_size) != 0) {
zcmd_free_nvlists(&zc);
return (NULL);
}
while ((err = ioctl(hdl->libzfs_fd, ZFS_IOC_POOL_TRYIMPORT,
&zc)) != 0 && errno == ENOMEM) {
if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) {
zcmd_free_nvlists(&zc);
return (NULL);
}
}
if (err) {
zcmd_free_nvlists(&zc);
return (NULL);
}
if (zcmd_read_dst_nvlist(hdl, &zc, &nvl) != 0) {
zcmd_free_nvlists(&zc);
return (NULL);
}
zcmd_free_nvlists(&zc);
return (nvl);
}
static nvlist_t *
refresh_config_libzfs(void *handle, nvlist_t *tryconfig)
{
return (refresh_config((libzfs_handle_t *)handle, tryconfig));
}
static int
pool_active_libzfs(void *handle, const char *name, uint64_t guid,
boolean_t *isactive)
{
return (pool_active((libzfs_handle_t *)handle, name, guid, isactive));
}
const pool_config_ops_t libzfs_config_ops = {
.pco_refresh_config = refresh_config_libzfs,
.pco_pool_active = pool_active_libzfs,
};
/*
* Return the offset of the given label.
*/
static uint64_t
label_offset(uint64_t size, int l)
{
ASSERT(P2PHASE_TYPED(size, sizeof (vdev_label_t), uint64_t) == 0);
return (l * sizeof (vdev_label_t) + (l < VDEV_LABELS / 2 ?
0 : size - VDEV_LABELS * sizeof (vdev_label_t)));
}
/*
* Given a file descriptor, clear (zero) the label information. This function
* is used in the appliance stack as part of the ZFS sysevent module and
* to implement the "zpool labelclear" command.
*/
int
zpool_clear_label(int fd)
{
struct stat64 statbuf;
int l;
vdev_label_t *label;
uint64_t size;
int labels_cleared = 0;
if (fstat64_blk(fd, &statbuf) == -1)
return (0);
size = P2ALIGN_TYPED(statbuf.st_size, sizeof (vdev_label_t), uint64_t);
if ((label = calloc(1, sizeof (vdev_label_t))) == NULL)
return (-1);
for (l = 0; l < VDEV_LABELS; l++) {
uint64_t state, guid;
nvlist_t *config;
if (pread64(fd, label, sizeof (vdev_label_t),
label_offset(size, l)) != sizeof (vdev_label_t)) {
continue;
}
if (nvlist_unpack(label->vl_vdev_phys.vp_nvlist,
sizeof (label->vl_vdev_phys.vp_nvlist), &config, 0) != 0) {
continue;
}
/* Skip labels which do not have a valid guid. */
if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID,
&guid) != 0 || guid == 0) {
nvlist_free(config);
continue;
}
/* Skip labels which are not in a known valid state. */
if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE,
&state) != 0 || state > POOL_STATE_L2CACHE) {
nvlist_free(config);
continue;
}
nvlist_free(config);
/*
* A valid label was found, overwrite this label's nvlist
* and uberblocks with zeros on disk. This is done to prevent
* system utilities, like blkid, from incorrectly detecting a
* partial label. The leading pad space is left untouched.
*/
memset(label, 0, sizeof (vdev_label_t));
size_t label_size = sizeof (vdev_label_t) - (2 * VDEV_PAD_SIZE);
if (pwrite64(fd, label, label_size, label_offset(size, l) +
(2 * VDEV_PAD_SIZE)) == label_size) {
labels_cleared++;
}
}
free(label);
if (labels_cleared == 0)
return (-1);
return (0);
}
static boolean_t
find_guid(nvlist_t *nv, uint64_t guid)
{
uint64_t tmp;
nvlist_t **child;
uint_t c, children;
verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &tmp) == 0);
if (tmp == guid)
return (B_TRUE);
if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
&child, &children) == 0) {
for (c = 0; c < children; c++)
if (find_guid(child[c], guid))
return (B_TRUE);
}
return (B_FALSE);
}
typedef struct aux_cbdata {
const char *cb_type;
uint64_t cb_guid;
zpool_handle_t *cb_zhp;
} aux_cbdata_t;
static int
find_aux(zpool_handle_t *zhp, void *data)
{
aux_cbdata_t *cbp = data;
nvlist_t **list;
uint_t i, count;
uint64_t guid;
nvlist_t *nvroot;
verify(nvlist_lookup_nvlist(zhp->zpool_config, ZPOOL_CONFIG_VDEV_TREE,
&nvroot) == 0);
if (nvlist_lookup_nvlist_array(nvroot, cbp->cb_type,
&list, &count) == 0) {
for (i = 0; i < count; i++) {
verify(nvlist_lookup_uint64(list[i],
ZPOOL_CONFIG_GUID, &guid) == 0);
if (guid == cbp->cb_guid) {
cbp->cb_zhp = zhp;
return (1);
}
}
}
zpool_close(zhp);
return (0);
}
/*
* Determines if the pool is in use. If so, it returns true and the state of
* the pool as well as the name of the pool. Name string is allocated and
* must be freed by the caller.
*/
int
zpool_in_use(libzfs_handle_t *hdl, int fd, pool_state_t *state, char **namestr,
boolean_t *inuse)
{
nvlist_t *config;
char *name;
boolean_t ret;
uint64_t guid, vdev_guid;
zpool_handle_t *zhp;
nvlist_t *pool_config;
uint64_t stateval, isspare;
aux_cbdata_t cb = { 0 };
boolean_t isactive;
*inuse = B_FALSE;
if (zpool_read_label(fd, &config, NULL) != 0) {
(void) no_memory(hdl);
return (-1);
}
if (config == NULL)
return (0);
verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE,
&stateval) == 0);
verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID,
&vdev_guid) == 0);
if (stateval != POOL_STATE_SPARE && stateval != POOL_STATE_L2CACHE) {
verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME,
&name) == 0);
verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID,
&guid) == 0);
}
switch (stateval) {
case POOL_STATE_EXPORTED:
/*
* A pool with an exported state may in fact be imported
* read-only, so check the in-core state to see if it's
* active and imported read-only. If it is, set
* its state to active.
*/
if (pool_active(hdl, name, guid, &isactive) == 0 && isactive &&
(zhp = zpool_open_canfail(hdl, name)) != NULL) {
if (zpool_get_prop_int(zhp, ZPOOL_PROP_READONLY, NULL))
stateval = POOL_STATE_ACTIVE;
/*
* All we needed the zpool handle for is the
* readonly prop check.
*/
zpool_close(zhp);
}
ret = B_TRUE;
break;
case POOL_STATE_ACTIVE:
/*
* For an active pool, we have to determine if it's really part
* of a currently active pool (in which case the pool will exist
* and the guid will be the same), or whether it's part of an
* active pool that was disconnected without being explicitly
* exported.
*/
if (pool_active(hdl, name, guid, &isactive) != 0) {
nvlist_free(config);
return (-1);
}
if (isactive) {
/*
* Because the device may have been removed while
* offlined, we only report it as active if the vdev is
* still present in the config. Otherwise, pretend like
* it's not in use.
*/
if ((zhp = zpool_open_canfail(hdl, name)) != NULL &&
(pool_config = zpool_get_config(zhp, NULL))
!= NULL) {
nvlist_t *nvroot;
verify(nvlist_lookup_nvlist(pool_config,
ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0);
ret = find_guid(nvroot, vdev_guid);
} else {
ret = B_FALSE;
}
/*
* If this is an active spare within another pool, we
* treat it like an unused hot spare. This allows the
* user to create a pool with a hot spare that currently
* in use within another pool. Since we return B_TRUE,
* libdiskmgt will continue to prevent generic consumers
* from using the device.
*/
if (ret && nvlist_lookup_uint64(config,
ZPOOL_CONFIG_IS_SPARE, &isspare) == 0 && isspare)
stateval = POOL_STATE_SPARE;
if (zhp != NULL)
zpool_close(zhp);
} else {
stateval = POOL_STATE_POTENTIALLY_ACTIVE;
ret = B_TRUE;
}
break;
case POOL_STATE_SPARE:
/*
* For a hot spare, it can be either definitively in use, or
* potentially active. To determine if it's in use, we iterate
* over all pools in the system and search for one with a spare
* with a matching guid.
*
* Due to the shared nature of spares, we don't actually report
* the potentially active case as in use. This means the user
* can freely create pools on the hot spares of exported pools,
* but to do otherwise makes the resulting code complicated, and
* we end up having to deal with this case anyway.
*/
cb.cb_zhp = NULL;
cb.cb_guid = vdev_guid;
cb.cb_type = ZPOOL_CONFIG_SPARES;
if (zpool_iter(hdl, find_aux, &cb) == 1) {
name = (char *)zpool_get_name(cb.cb_zhp);
ret = B_TRUE;
} else {
ret = B_FALSE;
}
break;
case POOL_STATE_L2CACHE:
/*
* Check if any pool is currently using this l2cache device.
*/
cb.cb_zhp = NULL;
cb.cb_guid = vdev_guid;
cb.cb_type = ZPOOL_CONFIG_L2CACHE;
if (zpool_iter(hdl, find_aux, &cb) == 1) {
name = (char *)zpool_get_name(cb.cb_zhp);
ret = B_TRUE;
} else {
ret = B_FALSE;
}
break;
default:
ret = B_FALSE;
}
if (ret) {
if ((*namestr = zfs_strdup(hdl, name)) == NULL) {
if (cb.cb_zhp)
zpool_close(cb.cb_zhp);
nvlist_free(config);
return (-1);
}
*state = (pool_state_t)stateval;
}
if (cb.cb_zhp)
zpool_close(cb.cb_zhp);
nvlist_free(config);
*inuse = ret;
return (0);
}