blob: dc27238c9cf37ab95de036134990fb3a0efece6e [file] [log] [blame]
/*
* 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 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* The pool configuration repository is stored in /etc/zfs/zpool.cache as a
* single packed nvlist. While it would be nice to just read in this
* file from userland, this wouldn't work from a local zone. So we have to have
* a zpool ioctl to return the complete configuration for all pools. In the
* global zone, this will be identical to reading the file and unpacking it in
* userland.
*/
#include <errno.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stddef.h>
#include <string.h>
#include <unistd.h>
#include <libintl.h>
#include <libuutil.h>
#include "libzfs_impl.h"
typedef struct config_node {
char *cn_name;
nvlist_t *cn_config;
uu_avl_node_t cn_avl;
} config_node_t;
/* ARGSUSED */
static int
config_node_compare(const void *a, const void *b, void *unused)
{
int ret;
const config_node_t *ca = (config_node_t *)a;
const config_node_t *cb = (config_node_t *)b;
ret = strcmp(ca->cn_name, cb->cn_name);
if (ret < 0)
return (-1);
else if (ret > 0)
return (1);
else
return (0);
}
void
namespace_clear(libzfs_handle_t *hdl)
{
if (hdl->libzfs_ns_avl) {
config_node_t *cn;
void *cookie = NULL;
while ((cn = uu_avl_teardown(hdl->libzfs_ns_avl,
&cookie)) != NULL) {
nvlist_free(cn->cn_config);
free(cn->cn_name);
free(cn);
}
uu_avl_destroy(hdl->libzfs_ns_avl);
hdl->libzfs_ns_avl = NULL;
}
if (hdl->libzfs_ns_avlpool) {
uu_avl_pool_destroy(hdl->libzfs_ns_avlpool);
hdl->libzfs_ns_avlpool = NULL;
}
}
/*
* Loads the pool namespace, or re-loads it if the cache has changed.
*/
static int
namespace_reload(libzfs_handle_t *hdl)
{
nvlist_t *config;
config_node_t *cn;
nvpair_t *elem;
zfs_cmd_t zc = { 0 };
void *cookie;
if (hdl->libzfs_ns_gen == 0) {
/*
* This is the first time we've accessed the configuration
* cache. Initialize the AVL tree and then fall through to the
* common code.
*/
if ((hdl->libzfs_ns_avlpool = uu_avl_pool_create("config_pool",
sizeof (config_node_t),
offsetof(config_node_t, cn_avl),
config_node_compare, UU_DEFAULT)) == NULL)
return (no_memory(hdl));
if ((hdl->libzfs_ns_avl = uu_avl_create(hdl->libzfs_ns_avlpool,
NULL, UU_DEFAULT)) == NULL)
return (no_memory(hdl));
}
if (zcmd_alloc_dst_nvlist(hdl, &zc, 0) != 0)
return (-1);
for (;;) {
zc.zc_cookie = hdl->libzfs_ns_gen;
if (ioctl(hdl->libzfs_fd, ZFS_IOC_POOL_CONFIGS, &zc) != 0) {
switch (errno) {
case EEXIST:
/*
* The namespace hasn't changed.
*/
zcmd_free_nvlists(&zc);
return (0);
case ENOMEM:
if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) {
zcmd_free_nvlists(&zc);
return (-1);
}
break;
default:
zcmd_free_nvlists(&zc);
return (zfs_standard_error(hdl, errno,
dgettext(TEXT_DOMAIN, "failed to read "
"pool configuration")));
}
} else {
hdl->libzfs_ns_gen = zc.zc_cookie;
break;
}
}
if (zcmd_read_dst_nvlist(hdl, &zc, &config) != 0) {
zcmd_free_nvlists(&zc);
return (-1);
}
zcmd_free_nvlists(&zc);
/*
* Clear out any existing configuration information.
*/
cookie = NULL;
while ((cn = uu_avl_teardown(hdl->libzfs_ns_avl, &cookie)) != NULL) {
nvlist_free(cn->cn_config);
free(cn->cn_name);
free(cn);
}
elem = NULL;
while ((elem = nvlist_next_nvpair(config, elem)) != NULL) {
nvlist_t *child;
uu_avl_index_t where;
if ((cn = zfs_alloc(hdl, sizeof (config_node_t))) == NULL) {
nvlist_free(config);
return (-1);
}
if ((cn->cn_name = zfs_strdup(hdl,
nvpair_name(elem))) == NULL) {
free(cn);
nvlist_free(config);
return (-1);
}
verify(nvpair_value_nvlist(elem, &child) == 0);
if (nvlist_dup(child, &cn->cn_config, 0) != 0) {
free(cn->cn_name);
free(cn);
nvlist_free(config);
return (no_memory(hdl));
}
verify(uu_avl_find(hdl->libzfs_ns_avl, cn, NULL, &where)
== NULL);
uu_avl_insert(hdl->libzfs_ns_avl, cn, where);
}
nvlist_free(config);
return (0);
}
/*
* Retrieve the configuration for the given pool. The configuration is a nvlist
* describing the vdevs, as well as the statistics associated with each one.
*/
nvlist_t *
zpool_get_config(zpool_handle_t *zhp, nvlist_t **oldconfig)
{
if (oldconfig)
*oldconfig = zhp->zpool_old_config;
return (zhp->zpool_config);
}
/*
* Refresh the vdev statistics associated with the given pool. This is used in
* iostat to show configuration changes and determine the delta from the last
* time the function was called. This function can fail, in case the pool has
* been destroyed.
*/
int
zpool_refresh_stats(zpool_handle_t *zhp, boolean_t *missing)
{
zfs_cmd_t zc = { 0 };
int error;
nvlist_t *config;
libzfs_handle_t *hdl = zhp->zpool_hdl;
*missing = B_FALSE;
(void) strcpy(zc.zc_name, zhp->zpool_name);
if (zhp->zpool_config_size == 0)
zhp->zpool_config_size = 1 << 16;
if (zcmd_alloc_dst_nvlist(hdl, &zc, zhp->zpool_config_size) != 0)
return (-1);
for (;;) {
if (ioctl(zhp->zpool_hdl->libzfs_fd, ZFS_IOC_POOL_STATS,
&zc) == 0) {
/*
* The real error is returned in the zc_cookie field.
*/
error = zc.zc_cookie;
break;
}
if (errno == ENOMEM) {
if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) {
zcmd_free_nvlists(&zc);
return (-1);
}
} else {
zcmd_free_nvlists(&zc);
if (errno == ENOENT || errno == EINVAL)
*missing = B_TRUE;
zhp->zpool_state = POOL_STATE_UNAVAIL;
return (0);
}
}
if (zcmd_read_dst_nvlist(hdl, &zc, &config) != 0) {
zcmd_free_nvlists(&zc);
return (-1);
}
zcmd_free_nvlists(&zc);
zhp->zpool_config_size = zc.zc_nvlist_dst_size;
if (zhp->zpool_config != NULL) {
uint64_t oldtxg, newtxg;
verify(nvlist_lookup_uint64(zhp->zpool_config,
ZPOOL_CONFIG_POOL_TXG, &oldtxg) == 0);
verify(nvlist_lookup_uint64(config,
ZPOOL_CONFIG_POOL_TXG, &newtxg) == 0);
if (zhp->zpool_old_config != NULL)
nvlist_free(zhp->zpool_old_config);
if (oldtxg != newtxg) {
nvlist_free(zhp->zpool_config);
zhp->zpool_old_config = NULL;
} else {
zhp->zpool_old_config = zhp->zpool_config;
}
}
zhp->zpool_config = config;
if (error)
zhp->zpool_state = POOL_STATE_UNAVAIL;
else
zhp->zpool_state = POOL_STATE_ACTIVE;
return (0);
}
/*
* Iterate over all pools in the system.
*/
int
zpool_iter(libzfs_handle_t *hdl, zpool_iter_f func, void *data)
{
config_node_t *cn;
zpool_handle_t *zhp;
int ret;
/*
* If someone makes a recursive call to zpool_iter(), we want to avoid
* refreshing the namespace because that will invalidate the parent
* context. We allow recursive calls, but simply re-use the same
* namespace AVL tree.
*/
if (!hdl->libzfs_pool_iter && namespace_reload(hdl) != 0)
return (-1);
hdl->libzfs_pool_iter++;
for (cn = uu_avl_first(hdl->libzfs_ns_avl); cn != NULL;
cn = uu_avl_next(hdl->libzfs_ns_avl, cn)) {
if (zpool_open_silent(hdl, cn->cn_name, &zhp) != 0) {
hdl->libzfs_pool_iter--;
return (-1);
}
if (zhp == NULL)
continue;
if ((ret = func(zhp, data)) != 0) {
hdl->libzfs_pool_iter--;
return (ret);
}
}
hdl->libzfs_pool_iter--;
return (0);
}
/*
* Iterate over root datasets, calling the given function for each. The zfs
* handle passed each time must be explicitly closed by the callback.
*/
int
zfs_iter_root(libzfs_handle_t *hdl, zfs_iter_f func, void *data)
{
config_node_t *cn;
zfs_handle_t *zhp;
int ret;
if (namespace_reload(hdl) != 0)
return (-1);
for (cn = uu_avl_first(hdl->libzfs_ns_avl); cn != NULL;
cn = uu_avl_next(hdl->libzfs_ns_avl, cn)) {
if ((zhp = make_dataset_handle(hdl, cn->cn_name)) == NULL)
continue;
if ((ret = func(zhp, data)) != 0)
return (ret);
}
return (0);
}