mirror of
https://github.com/freebsd/freebsd-src
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355 lines
8.5 KiB
C++
355 lines
8.5 KiB
C++
/*-
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* Copyright (c) 2011, 2012, 2013, 2014 Spectra Logic Corporation
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*
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* Authors: Justin T. Gibbs (Spectra Logic Corporation)
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*/
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/**
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* \file vdev.cc
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*
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* Implementation of the Vdev class.
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*/
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#include <syslog.h>
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#include <sys/cdefs.h>
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#include <sys/byteorder.h>
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#include <sys/fs/zfs.h>
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#include <libzfs.h>
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/*
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* Undefine flush, defined by cpufunc.h on sparc64, because it conflicts with
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* C++ flush methods
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*/
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#undef flush
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#include <list>
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#include <map>
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#include <string>
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#include <sstream>
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#include <devdctl/guid.h>
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#include <devdctl/event.h>
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#include <devdctl/event_factory.h>
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#include <devdctl/exception.h>
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#include <devdctl/consumer.h>
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#include "vdev.h"
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#include "vdev_iterator.h"
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#include "zfsd.h"
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#include "zfsd_exception.h"
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#include "zpool_list.h"
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/*============================ Namespace Control =============================*/
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using std::string;
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using std::stringstream;
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//- Special objects -----------------------------------------------------------
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Vdev NonexistentVdev;
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//- Vdev Inline Public Methods ------------------------------------------------
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/*=========================== Class Implementations ==========================*/
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/*----------------------------------- Vdev -----------------------------------*/
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/* Special constructor for NonexistentVdev. */
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Vdev::Vdev()
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: m_poolConfig(NULL),
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m_config(NULL)
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{}
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bool
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Vdev::VdevLookupPoolGuid()
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{
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uint64_t guid;
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if (nvlist_lookup_uint64(m_poolConfig, ZPOOL_CONFIG_POOL_GUID, &guid))
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return (false);
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m_poolGUID = guid;
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return (true);
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}
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void
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Vdev::VdevLookupGuid()
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{
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uint64_t guid;
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if (nvlist_lookup_uint64(m_config, ZPOOL_CONFIG_GUID, &guid) != 0)
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throw ZfsdException("Unable to extract vdev GUID "
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"from vdev config data.");
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m_vdevGUID = guid;
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}
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Vdev::Vdev(zpool_handle_t *pool, nvlist_t *config)
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: m_poolConfig(zpool_get_config(pool, NULL)),
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m_config(config)
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{
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if (!VdevLookupPoolGuid())
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throw ZfsdException("Can't extract pool GUID from handle.");
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VdevLookupGuid();
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}
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Vdev::Vdev(nvlist_t *poolConfig, nvlist_t *config)
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: m_poolConfig(poolConfig),
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m_config(config)
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{
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if (!VdevLookupPoolGuid())
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throw ZfsdException("Can't extract pool GUID from config.");
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VdevLookupGuid();
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}
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Vdev::Vdev(nvlist_t *labelConfig)
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: m_poolConfig(labelConfig),
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m_config(labelConfig)
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{
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/*
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* Spares do not have a Pool GUID. Tolerate its absence.
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* Code accessing this Vdev in a context where the Pool GUID is
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* required will find it invalid (as it is upon Vdev construction)
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* and act accordingly.
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*/
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(void) VdevLookupPoolGuid();
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VdevLookupGuid();
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try {
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m_config = VdevIterator(labelConfig).Find(m_vdevGUID);
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} catch (const ZfsdException &exp) {
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/*
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* When reading a spare's label, it is normal not to find
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* a list of vdevs
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*/
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m_config = NULL;
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}
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}
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bool
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Vdev::IsSpare() const
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{
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uint64_t is_spare(0);
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if (m_config == NULL)
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return (false);
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(void)nvlist_lookup_uint64(m_config, ZPOOL_CONFIG_IS_SPARE, &is_spare);
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return (bool(is_spare));
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}
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vdev_state
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Vdev::State() const
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{
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uint64_t *nvlist_array;
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vdev_stat_t *vs;
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uint_t vsc;
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if (m_config == NULL) {
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/*
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* If we couldn't find the list of vdevs, that normally means
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* that this is an available hotspare. In that case, we will
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* presume it to be healthy. Even if this spare had formerly
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* been in use, been degraded, and been replaced, the act of
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* replacement wipes the degraded bit from the label. So we
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* have no choice but to presume that it is healthy.
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*/
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return (VDEV_STATE_HEALTHY);
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}
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if (nvlist_lookup_uint64_array(m_config, ZPOOL_CONFIG_VDEV_STATS,
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&nvlist_array, &vsc) == 0) {
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vs = reinterpret_cast<vdev_stat_t *>(nvlist_array);
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return (static_cast<vdev_state>(vs->vs_state));
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}
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/*
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* Stats are not available. This vdev was created from a label.
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* Synthesize a state based on available data.
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*/
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uint64_t faulted(0);
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uint64_t degraded(0);
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(void)nvlist_lookup_uint64(m_config, ZPOOL_CONFIG_FAULTED, &faulted);
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(void)nvlist_lookup_uint64(m_config, ZPOOL_CONFIG_DEGRADED, °raded);
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if (faulted)
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return (VDEV_STATE_FAULTED);
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if (degraded)
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return (VDEV_STATE_DEGRADED);
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return (VDEV_STATE_HEALTHY);
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}
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std::list<Vdev>
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Vdev::Children()
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{
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nvlist_t **vdevChildren;
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int result;
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u_int numChildren;
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std::list<Vdev> children;
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if (m_poolConfig == NULL || m_config == NULL)
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return (children);
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result = nvlist_lookup_nvlist_array(m_config,
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ZPOOL_CONFIG_CHILDREN, &vdevChildren, &numChildren);
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if (result != 0)
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return (children);
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for (u_int c = 0;c < numChildren; c++)
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children.push_back(Vdev(m_poolConfig, vdevChildren[c]));
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return (children);
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}
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Vdev
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Vdev::RootVdev()
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{
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nvlist_t *rootVdev;
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if (m_poolConfig == NULL)
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return (NonexistentVdev);
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if (nvlist_lookup_nvlist(m_poolConfig, ZPOOL_CONFIG_VDEV_TREE,
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&rootVdev) != 0)
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return (NonexistentVdev);
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return (Vdev(m_poolConfig, rootVdev));
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}
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/*
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* Find our parent. This requires doing a traversal of the config; we can't
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* cache it as leaf vdevs may change their pool config location (spare,
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* replacing, mirror, etc).
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*/
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Vdev
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Vdev::Parent()
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{
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std::list<Vdev> to_examine;
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std::list<Vdev> children;
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std::list<Vdev>::iterator children_it;
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to_examine.push_back(RootVdev());
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for (;;) {
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if (to_examine.empty())
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return (NonexistentVdev);
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Vdev vd = to_examine.front();
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if (vd.DoesNotExist())
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return (NonexistentVdev);
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to_examine.pop_front();
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children = vd.Children();
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children_it = children.begin();
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for (;children_it != children.end(); children_it++) {
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Vdev child = *children_it;
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if (child.GUID() == GUID())
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return (vd);
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to_examine.push_front(child);
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}
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}
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}
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bool
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Vdev::IsAvailableSpare() const
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{
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/* If we have a pool guid, we cannot be an available spare. */
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if (PoolGUID())
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return (false);
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return (true);
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}
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bool
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Vdev::IsSpare()
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{
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uint64_t spare;
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if (nvlist_lookup_uint64(m_config, ZPOOL_CONFIG_IS_SPARE, &spare) != 0)
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return (false);
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return (spare != 0);
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}
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bool
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Vdev::IsActiveSpare() const
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{
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vdev_stat_t *vs;
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uint_t c;
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if (m_poolConfig == NULL)
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return (false);
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(void) nvlist_lookup_uint64_array(m_config, ZPOOL_CONFIG_VDEV_STATS,
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reinterpret_cast<uint64_t **>(&vs), &c);
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if (vs == NULL || vs->vs_aux != VDEV_AUX_SPARED)
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return (false);
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return (true);
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}
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bool
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Vdev::IsResilvering() const
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{
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pool_scan_stat_t *ps = NULL;
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uint_t c;
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if (State() != VDEV_STATE_HEALTHY)
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return (false);
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(void) nvlist_lookup_uint64_array(m_config, ZPOOL_CONFIG_SCAN_STATS,
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reinterpret_cast<uint64_t **>(&ps), &c);
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if (ps == NULL || ps->pss_func != POOL_SCAN_RESILVER)
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return (false);
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return (true);
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}
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string
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Vdev::GUIDString() const
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{
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stringstream vdevGUIDString;
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vdevGUIDString << GUID();
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return (vdevGUIDString.str());
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}
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string
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Vdev::Name(zpool_handle_t *zhp, bool verbose) const
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{
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return (zpool_vdev_name(g_zfsHandle, zhp, m_config,
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verbose ? B_TRUE : B_FALSE));
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}
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string
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Vdev::Path() const
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{
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const char *path(NULL);
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if ((m_config != NULL)
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&& (nvlist_lookup_string(m_config, ZPOOL_CONFIG_PATH, &path) == 0))
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return (path);
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return ("");
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}
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string
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Vdev::PhysicalPath() const
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{
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const char *path(NULL);
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if ((m_config != NULL) && (nvlist_lookup_string(m_config,
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ZPOOL_CONFIG_PHYS_PATH, &path) == 0))
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return (path);
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return ("");
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}
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