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freebsd-dev/cddl/usr.sbin/zfsd/case_file.cc
Alan Somers 9df99d6ed0 Fix an unchecked return value in zfsd 
It's pretty unlikely to actually hit this, but good to check it anyway

Reported by:	Coverity
CID:		1362018
MFC after:	4 weeks
Sponsored by:	Spectra Logic Corp
2017-01-18 22:10:18 +00:00

1107 lines
29 KiB
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/*-
* Copyright (c) 2011, 2012, 2013, 2014, 2016 Spectra Logic Corporation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* Authors: Justin T. Gibbs (Spectra Logic Corporation)
*/
/**
* \file case_file.cc
*
* We keep case files for any leaf vdev that is not in the optimal state.
* However, we only serialize to disk those events that need to be preserved
* across reboots. For now, this is just a log of soft errors which we
* accumulate in order to mark a device as degraded.
*/
#include <sys/cdefs.h>
#include <sys/time.h>
#include <sys/fs/zfs.h>
#include <dirent.h>
#include <iomanip>
#include <fstream>
#include <functional>
#include <sstream>
#include <syslog.h>
#include <unistd.h>
#include <libzfs.h>
#include <list>
#include <map>
#include <string>
#include <devdctl/guid.h>
#include <devdctl/event.h>
#include <devdctl/event_factory.h>
#include <devdctl/exception.h>
#include <devdctl/consumer.h>
#include "callout.h"
#include "vdev_iterator.h"
#include "zfsd_event.h"
#include "case_file.h"
#include "vdev.h"
#include "zfsd.h"
#include "zfsd_exception.h"
#include "zpool_list.h"
__FBSDID("$FreeBSD$");
/*============================ Namespace Control =============================*/
using std::auto_ptr;
using std::hex;
using std::ifstream;
using std::stringstream;
using std::setfill;
using std::setw;
using DevdCtl::Event;
using DevdCtl::EventFactory;
using DevdCtl::EventList;
using DevdCtl::Guid;
using DevdCtl::ParseException;
/*--------------------------------- CaseFile ---------------------------------*/
//- CaseFile Static Data -------------------------------------------------------
CaseFileList CaseFile::s_activeCases;
const string CaseFile::s_caseFilePath = "/var/db/zfsd/cases";
const timeval CaseFile::s_removeGracePeriod = { 60 /*sec*/, 0 /*usec*/};
//- CaseFile Static Public Methods ---------------------------------------------
CaseFile *
CaseFile::Find(Guid poolGUID, Guid vdevGUID)
{
for (CaseFileList::iterator curCase = s_activeCases.begin();
curCase != s_activeCases.end(); curCase++) {
if ((*curCase)->PoolGUID() != poolGUID
|| (*curCase)->VdevGUID() != vdevGUID)
continue;
/*
* We only carry one active case per-vdev.
*/
return (*curCase);
}
return (NULL);
}
CaseFile *
CaseFile::Find(const string &physPath)
{
CaseFile *result = NULL;
for (CaseFileList::iterator curCase = s_activeCases.begin();
curCase != s_activeCases.end(); curCase++) {
if ((*curCase)->PhysicalPath() != physPath)
continue;
if (result != NULL) {
syslog(LOG_WARNING, "Multiple casefiles found for "
"physical path %s. "
"This is most likely a bug in zfsd",
physPath.c_str());
}
result = *curCase;
}
return (result);
}
void
CaseFile::ReEvaluateByGuid(Guid poolGUID, const ZfsEvent &event)
{
CaseFileList::iterator casefile;
for (casefile = s_activeCases.begin(); casefile != s_activeCases.end();){
CaseFileList::iterator next = casefile;
next++;
if (poolGUID == (*casefile)->PoolGUID())
(*casefile)->ReEvaluate(event);
casefile = next;
}
}
CaseFile &
CaseFile::Create(Vdev &vdev)
{
CaseFile *activeCase;
activeCase = Find(vdev.PoolGUID(), vdev.GUID());
if (activeCase == NULL)
activeCase = new CaseFile(vdev);
return (*activeCase);
}
void
CaseFile::DeSerialize()
{
struct dirent **caseFiles;
int numCaseFiles(scandir(s_caseFilePath.c_str(), &caseFiles,
DeSerializeSelector, /*compar*/NULL));
if (numCaseFiles == -1)
return;
if (numCaseFiles == 0) {
free(caseFiles);
return;
}
for (int i = 0; i < numCaseFiles; i++) {
DeSerializeFile(caseFiles[i]->d_name);
free(caseFiles[i]);
}
free(caseFiles);
}
void
CaseFile::LogAll()
{
for (CaseFileList::iterator curCase = s_activeCases.begin();
curCase != s_activeCases.end(); curCase++)
(*curCase)->Log();
}
void
CaseFile::PurgeAll()
{
/*
* Serialize casefiles before deleting them so that they can be reread
* and revalidated during BuildCaseFiles.
* CaseFiles remove themselves from this list on destruction.
*/
while (s_activeCases.size() != 0) {
CaseFile *casefile = s_activeCases.front();
casefile->Serialize();
delete casefile;
}
}
//- CaseFile Public Methods ----------------------------------------------------
bool
CaseFile::RefreshVdevState()
{
ZpoolList zpl(ZpoolList::ZpoolByGUID, &m_poolGUID);
zpool_handle_t *casePool(zpl.empty() ? NULL : zpl.front());
if (casePool == NULL)
return (false);
Vdev vd(casePool, CaseVdev(casePool));
if (vd.DoesNotExist())
return (false);
m_vdevState = vd.State();
m_vdevPhysPath = vd.PhysicalPath();
return (true);
}
bool
CaseFile::ReEvaluate(const string &devPath, const string &physPath, Vdev *vdev)
{
ZpoolList zpl(ZpoolList::ZpoolByGUID, &m_poolGUID);
zpool_handle_t *pool(zpl.empty() ? NULL : zpl.front());
if (pool == NULL || !RefreshVdevState()) {
/*
* The pool or vdev for this case file is no longer
* part of the configuration. This can happen
* if we process a device arrival notification
* before seeing the ZFS configuration change
* event.
*/
syslog(LOG_INFO,
"CaseFile::ReEvaluate(%s,%s) Pool/Vdev unconfigured. "
"Closing\n",
PoolGUIDString().c_str(),
VdevGUIDString().c_str());
Close();
/*
* Since this event was not used to close this
* case, do not report it as consumed.
*/
return (/*consumed*/false);
}
if (VdevState() > VDEV_STATE_CANT_OPEN) {
/*
* For now, newly discovered devices only help for
* devices that are missing. In the future, we might
* use a newly inserted spare to replace a degraded
* or faulted device.
*/
syslog(LOG_INFO, "CaseFile::ReEvaluate(%s,%s): Pool/Vdev ignored",
PoolGUIDString().c_str(), VdevGUIDString().c_str());
return (/*consumed*/false);
}
if (vdev != NULL
&& vdev->PoolGUID() == m_poolGUID
&& vdev->GUID() == m_vdevGUID) {
zpool_vdev_online(pool, vdev->GUIDString().c_str(),
ZFS_ONLINE_CHECKREMOVE | ZFS_ONLINE_UNSPARE,
&m_vdevState);
syslog(LOG_INFO, "Onlined vdev(%s/%s:%s). State now %s.\n",
zpool_get_name(pool), vdev->GUIDString().c_str(),
devPath.c_str(),
zpool_state_to_name(VdevState(), VDEV_AUX_NONE));
/*
* Check the vdev state post the online action to see
* if we can retire this case.
*/
CloseIfSolved();
return (/*consumed*/true);
}
/*
* If the auto-replace policy is enabled, and we have physical
* path information, try a physical path replacement.
*/
if (zpool_get_prop_int(pool, ZPOOL_PROP_AUTOREPLACE, NULL) == 0) {
syslog(LOG_INFO,
"CaseFile(%s:%s:%s): AutoReplace not set. "
"Ignoring device insertion.\n",
PoolGUIDString().c_str(),
VdevGUIDString().c_str(),
zpool_state_to_name(VdevState(), VDEV_AUX_NONE));
return (/*consumed*/false);
}
if (PhysicalPath().empty()) {
syslog(LOG_INFO,
"CaseFile(%s:%s:%s): No physical path information. "
"Ignoring device insertion.\n",
PoolGUIDString().c_str(),
VdevGUIDString().c_str(),
zpool_state_to_name(VdevState(), VDEV_AUX_NONE));
return (/*consumed*/false);
}
if (physPath != PhysicalPath()) {
syslog(LOG_INFO,
"CaseFile(%s:%s:%s): Physical path mismatch. "
"Ignoring device insertion.\n",
PoolGUIDString().c_str(),
VdevGUIDString().c_str(),
zpool_state_to_name(VdevState(), VDEV_AUX_NONE));
return (/*consumed*/false);
}
/* Write a label on the newly inserted disk. */
if (zpool_label_disk(g_zfsHandle, pool, devPath.c_str()) != 0) {
syslog(LOG_ERR,
"Replace vdev(%s/%s) by physical path (label): %s: %s\n",
zpool_get_name(pool), VdevGUIDString().c_str(),
libzfs_error_action(g_zfsHandle),
libzfs_error_description(g_zfsHandle));
return (/*consumed*/false);
}
syslog(LOG_INFO, "CaseFile::ReEvaluate(%s/%s): Replacing with %s",
PoolGUIDString().c_str(), VdevGUIDString().c_str(),
devPath.c_str());
return (Replace(VDEV_TYPE_DISK, devPath.c_str(), /*isspare*/false));
}
bool
CaseFile::ReEvaluate(const ZfsEvent &event)
{
bool consumed(false);
if (event.Value("type") == "misc.fs.zfs.vdev_remove") {
/*
* The Vdev we represent has been removed from the
* configuration. This case is no longer of value.
*/
Close();
return (/*consumed*/true);
} else if (event.Value("type") == "misc.fs.zfs.pool_destroy") {
/* This Pool has been destroyed. Discard the case */
Close();
return (/*consumed*/true);
} else if (event.Value("type") == "misc.fs.zfs.config_sync") {
RefreshVdevState();
if (VdevState() < VDEV_STATE_HEALTHY)
consumed = ActivateSpare();
}
if (event.Value("class") == "resource.fs.zfs.removed") {
bool spare_activated;
if (!RefreshVdevState()) {
/*
* The pool or vdev for this case file is no longer
* part of the configuration. This can happen
* if we process a device arrival notification
* before seeing the ZFS configuration change
* event.
*/
syslog(LOG_INFO,
"CaseFile::ReEvaluate(%s,%s) Pool/Vdev "
"unconfigured. Closing\n",
PoolGUIDString().c_str(),
VdevGUIDString().c_str());
/*
* Close the case now so we won't waste cycles in the
* system rescan
*/
Close();
/*
* Since this event was not used to close this
* case, do not report it as consumed.
*/
return (/*consumed*/false);
}
/*
* Discard any tentative I/O error events for
* this case. They were most likely caused by the
* hot-unplug of this device.
*/
PurgeTentativeEvents();
/* Try to activate spares if they are available */
spare_activated = ActivateSpare();
/*
* Rescan the drives in the system to see if a recent
* drive arrival can be used to solve this case.
*/
ZfsDaemon::RequestSystemRescan();
/*
* Consume the event if we successfully activated a spare.
* Otherwise, leave it in the unconsumed events list so that the
* future addition of a spare to this pool might be able to
* close the case
*/
consumed = spare_activated;
} else if (event.Value("class") == "resource.fs.zfs.statechange") {
RefreshVdevState();
/*
* If this vdev is DEGRADED, FAULTED, or UNAVAIL, try to
* activate a hotspare. Otherwise, ignore the event
*/
if (VdevState() == VDEV_STATE_FAULTED ||
VdevState() == VDEV_STATE_DEGRADED ||
VdevState() == VDEV_STATE_CANT_OPEN)
(void) ActivateSpare();
consumed = true;
}
else if (event.Value("class") == "ereport.fs.zfs.io" ||
event.Value("class") == "ereport.fs.zfs.checksum") {
m_tentativeEvents.push_front(event.DeepCopy());
RegisterCallout(event);
consumed = true;
}
bool closed(CloseIfSolved());
return (consumed || closed);
}
bool
CaseFile::ActivateSpare() {
nvlist_t *config, *nvroot;
nvlist_t **spares;
char *devPath, *vdev_type;
const char *poolname;
u_int nspares, i;
int error;
ZpoolList zpl(ZpoolList::ZpoolByGUID, &m_poolGUID);
zpool_handle_t *zhp(zpl.empty() ? NULL : zpl.front());
if (zhp == NULL) {
syslog(LOG_ERR, "CaseFile::ActivateSpare: Could not find pool "
"for pool_guid %" PRIu64".", (uint64_t)m_poolGUID);
return (false);
}
poolname = zpool_get_name(zhp);
config = zpool_get_config(zhp, NULL);
if (config == NULL) {
syslog(LOG_ERR, "CaseFile::ActivateSpare: Could not find pool "
"config for pool %s", poolname);
return (false);
}
error = nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nvroot);
if (error != 0){
syslog(LOG_ERR, "CaseFile::ActivateSpare: Could not find vdev "
"tree for pool %s", poolname);
return (false);
}
nspares = 0;
nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, &spares,
&nspares);
if (nspares == 0) {
/* The pool has no spares configured */
syslog(LOG_INFO, "CaseFile::ActivateSpare: "
"No spares available for pool %s", poolname);
return (false);
}
for (i = 0; i < nspares; i++) {
uint64_t *nvlist_array;
vdev_stat_t *vs;
uint_t nstats;
if (nvlist_lookup_uint64_array(spares[i],
ZPOOL_CONFIG_VDEV_STATS, &nvlist_array, &nstats) != 0) {
syslog(LOG_ERR, "CaseFile::ActivateSpare: Could not "
"find vdev stats for pool %s, spare %d",
poolname, i);
return (false);
}
vs = reinterpret_cast<vdev_stat_t *>(nvlist_array);
if ((vs->vs_aux != VDEV_AUX_SPARED)
&& (vs->vs_state == VDEV_STATE_HEALTHY)) {
/* We found a usable spare */
break;
}
}
if (i == nspares) {
/* No available spares were found */
return (false);
}
error = nvlist_lookup_string(spares[i], ZPOOL_CONFIG_PATH, &devPath);
if (error != 0) {
syslog(LOG_ERR, "CaseFile::ActivateSpare: Cannot determine "
"the path of pool %s, spare %d. Error %d",
poolname, i, error);
return (false);
}
error = nvlist_lookup_string(spares[i], ZPOOL_CONFIG_TYPE, &vdev_type);
if (error != 0) {
syslog(LOG_ERR, "CaseFile::ActivateSpare: Cannot determine "
"the vdev type of pool %s, spare %d. Error %d",
poolname, i, error);
return (false);
}
return (Replace(vdev_type, devPath, /*isspare*/true));
}
void
CaseFile::RegisterCallout(const Event &event)
{
timeval now, countdown, elapsed, timestamp, zero, remaining;
gettimeofday(&now, 0);
timestamp = event.GetTimestamp();
timersub(&now, &timestamp, &elapsed);
timersub(&s_removeGracePeriod, &elapsed, &countdown);
/*
* If countdown is <= zero, Reset the timer to the
* smallest positive time value instead
*/
timerclear(&zero);
if (timercmp(&countdown, &zero, <=)) {
timerclear(&countdown);
countdown.tv_usec = 1;
}
remaining = m_tentativeTimer.TimeRemaining();
if (!m_tentativeTimer.IsPending()
|| timercmp(&countdown, &remaining, <))
m_tentativeTimer.Reset(countdown, OnGracePeriodEnded, this);
}
bool
CaseFile::CloseIfSolved()
{
if (m_events.empty()
&& m_tentativeEvents.empty()) {
/*
* We currently do not track or take actions on
* devices in the degraded or faulted state.
* Once we have support for spare pools, we'll
* retain these cases so that any spares added in
* the future can be applied to them.
*/
switch (VdevState()) {
case VDEV_STATE_HEALTHY:
/* No need to keep cases for healthy vdevs */
Close();
return (true);
case VDEV_STATE_REMOVED:
case VDEV_STATE_CANT_OPEN:
/*
* Keep open. We may solve it with a newly inserted
* device.
*/
case VDEV_STATE_FAULTED:
case VDEV_STATE_DEGRADED:
/*
* Keep open. We may solve it with the future
* addition of a spare to the pool
*/
case VDEV_STATE_UNKNOWN:
case VDEV_STATE_CLOSED:
case VDEV_STATE_OFFLINE:
/*
* Keep open? This may not be the correct behavior,
* but it's what we've always done
*/
;
}
/*
* Re-serialize the case in order to remove any
* previous event data.
*/
Serialize();
}
return (false);
}
void
CaseFile::Log()
{
syslog(LOG_INFO, "CaseFile(%s,%s,%s)\n", PoolGUIDString().c_str(),
VdevGUIDString().c_str(), PhysicalPath().c_str());
syslog(LOG_INFO, "\tVdev State = %s\n",
zpool_state_to_name(VdevState(), VDEV_AUX_NONE));
if (m_tentativeEvents.size() != 0) {
syslog(LOG_INFO, "\t=== Tentative Events ===\n");
for (EventList::iterator event(m_tentativeEvents.begin());
event != m_tentativeEvents.end(); event++)
(*event)->Log(LOG_INFO);
}
if (m_events.size() != 0) {
syslog(LOG_INFO, "\t=== Events ===\n");
for (EventList::iterator event(m_events.begin());
event != m_events.end(); event++)
(*event)->Log(LOG_INFO);
}
}
//- CaseFile Static Protected Methods ------------------------------------------
void
CaseFile::OnGracePeriodEnded(void *arg)
{
CaseFile &casefile(*static_cast<CaseFile *>(arg));
casefile.OnGracePeriodEnded();
}
int
CaseFile::DeSerializeSelector(const struct dirent *dirEntry)
{
uint64_t poolGUID;
uint64_t vdevGUID;
if (dirEntry->d_type == DT_REG
&& sscanf(dirEntry->d_name, "pool_%" PRIu64 "_vdev_%" PRIu64 ".case",
&poolGUID, &vdevGUID) == 2)
return (1);
return (0);
}
void
CaseFile::DeSerializeFile(const char *fileName)
{
string fullName(s_caseFilePath + '/' + fileName);
CaseFile *existingCaseFile(NULL);
CaseFile *caseFile(NULL);
try {
uint64_t poolGUID;
uint64_t vdevGUID;
nvlist_t *vdevConf;
if (sscanf(fileName, "pool_%" PRIu64 "_vdev_%" PRIu64 ".case",
&poolGUID, &vdevGUID) != 2) {
throw ZfsdException("CaseFile::DeSerialize: "
"Unintelligible CaseFile filename %s.\n", fileName);
}
existingCaseFile = Find(Guid(poolGUID), Guid(vdevGUID));
if (existingCaseFile != NULL) {
/*
* If the vdev is already degraded or faulted,
* there's no point in keeping the state around
* that we use to put a drive into the degraded
* state. However, if the vdev is simply missing,
* preserve the case data in the hopes that it will
* return.
*/
caseFile = existingCaseFile;
vdev_state curState(caseFile->VdevState());
if (curState > VDEV_STATE_CANT_OPEN
&& curState < VDEV_STATE_HEALTHY) {
unlink(fileName);
return;
}
} else {
ZpoolList zpl(ZpoolList::ZpoolByGUID, &poolGUID);
if (zpl.empty()
|| (vdevConf = VdevIterator(zpl.front())
.Find(vdevGUID)) == NULL) {
/*
* Either the pool no longer exists
* or this vdev is no longer a member of
* the pool.
*/
unlink(fullName.c_str());
return;
}
/*
* Any vdev we find that does not have a case file
* must be in the healthy state and thus worthy of
* continued SERD data tracking.
*/
caseFile = new CaseFile(Vdev(zpl.front(), vdevConf));
}
ifstream caseStream(fullName.c_str());
if (!caseStream)
throw ZfsdException("CaseFile::DeSerialize: Unable to "
"read %s.\n", fileName);
caseFile->DeSerialize(caseStream);
} catch (const ParseException &exp) {
exp.Log();
if (caseFile != existingCaseFile)
delete caseFile;
/*
* Since we can't parse the file, unlink it so we don't
* trip over it again.
*/
unlink(fileName);
} catch (const ZfsdException &zfsException) {
zfsException.Log();
if (caseFile != existingCaseFile)
delete caseFile;
}
}
//- CaseFile Protected Methods -------------------------------------------------
CaseFile::CaseFile(const Vdev &vdev)
: m_poolGUID(vdev.PoolGUID()),
m_vdevGUID(vdev.GUID()),
m_vdevState(vdev.State()),
m_vdevPhysPath(vdev.PhysicalPath())
{
stringstream guidString;
guidString << m_vdevGUID;
m_vdevGUIDString = guidString.str();
guidString.str("");
guidString << m_poolGUID;
m_poolGUIDString = guidString.str();
s_activeCases.push_back(this);
syslog(LOG_INFO, "Creating new CaseFile:\n");
Log();
}
CaseFile::~CaseFile()
{
PurgeEvents();
PurgeTentativeEvents();
m_tentativeTimer.Stop();
s_activeCases.remove(this);
}
void
CaseFile::PurgeEvents()
{
for (EventList::iterator event(m_events.begin());
event != m_events.end(); event++)
delete *event;
m_events.clear();
}
void
CaseFile::PurgeTentativeEvents()
{
for (EventList::iterator event(m_tentativeEvents.begin());
event != m_tentativeEvents.end(); event++)
delete *event;
m_tentativeEvents.clear();
}
void
CaseFile::SerializeEvList(const EventList events, int fd,
const char* prefix) const
{
if (events.empty())
return;
for (EventList::const_iterator curEvent = events.begin();
curEvent != events.end(); curEvent++) {
const string &eventString((*curEvent)->GetEventString());
// TODO: replace many write(2) calls with a single writev(2)
if (prefix)
write(fd, prefix, strlen(prefix));
write(fd, eventString.c_str(), eventString.length());
}
}
void
CaseFile::Serialize()
{
stringstream saveFile;
saveFile << setfill('0')
<< s_caseFilePath << "/"
<< "pool_" << PoolGUIDString()
<< "_vdev_" << VdevGUIDString()
<< ".case";
if (m_events.empty() && m_tentativeEvents.empty()) {
unlink(saveFile.str().c_str());
return;
}
int fd(open(saveFile.str().c_str(), O_CREAT|O_TRUNC|O_WRONLY, 0644));
if (fd == -1) {
syslog(LOG_ERR, "CaseFile::Serialize: Unable to open %s.\n",
saveFile.str().c_str());
return;
}
SerializeEvList(m_events, fd);
SerializeEvList(m_tentativeEvents, fd, "tentative ");
close(fd);
}
/*
* XXX: This method assumes that events may not contain embedded newlines. If
* ever events can contain embedded newlines, then CaseFile must switch
* serialization formats
*/
void
CaseFile::DeSerialize(ifstream &caseStream)
{
string evString;
const EventFactory &factory(ZfsDaemon::Get().GetFactory());
caseStream >> std::noskipws >> std::ws;
while (caseStream.good()) {
/*
* Outline:
* read the beginning of a line and check it for
* "tentative". If found, discard "tentative".
* Create a new event
* continue
*/
EventList* destEvents;
const string tentFlag("tentative ");
string line;
std::stringbuf lineBuf;
caseStream.get(lineBuf);
caseStream.ignore(); /*discard the newline character*/
line = lineBuf.str();
if (line.compare(0, tentFlag.size(), tentFlag) == 0) {
/* Discard "tentative" */
line.erase(0, tentFlag.size());
destEvents = &m_tentativeEvents;
} else {
destEvents = &m_events;
}
Event *event(Event::CreateEvent(factory, line));
if (event != NULL) {
destEvents->push_back(event);
RegisterCallout(*event);
}
}
}
void
CaseFile::Close()
{
/*
* This case is no longer relevant. Clean up our
* serialization file, and delete the case.
*/
syslog(LOG_INFO, "CaseFile(%s,%s) closed - State %s\n",
PoolGUIDString().c_str(), VdevGUIDString().c_str(),
zpool_state_to_name(VdevState(), VDEV_AUX_NONE));
/*
* Serialization of a Case with no event data, clears the
* Serialization data for that event.
*/
PurgeEvents();
Serialize();
delete this;
}
void
CaseFile::OnGracePeriodEnded()
{
bool should_fault, should_degrade;
ZpoolList zpl(ZpoolList::ZpoolByGUID, &m_poolGUID);
zpool_handle_t *zhp(zpl.empty() ? NULL : zpl.front());
m_events.splice(m_events.begin(), m_tentativeEvents);
should_fault = ShouldFault();
should_degrade = ShouldDegrade();
if (should_fault || should_degrade) {
if (zhp == NULL
|| (VdevIterator(zhp).Find(m_vdevGUID)) == NULL) {
/*
* Either the pool no longer exists
* or this vdev is no longer a member of
* the pool.
*/
Close();
return;
}
}
/* A fault condition has priority over a degrade condition */
if (ShouldFault()) {
/* Fault the vdev and close the case. */
if (zpool_vdev_fault(zhp, (uint64_t)m_vdevGUID,
VDEV_AUX_ERR_EXCEEDED) == 0) {
syslog(LOG_INFO, "Faulting vdev(%s/%s)",
PoolGUIDString().c_str(),
VdevGUIDString().c_str());
Close();
return;
}
else {
syslog(LOG_ERR, "Fault vdev(%s/%s): %s: %s\n",
PoolGUIDString().c_str(),
VdevGUIDString().c_str(),
libzfs_error_action(g_zfsHandle),
libzfs_error_description(g_zfsHandle));
}
}
else if (ShouldDegrade()) {
/* Degrade the vdev and close the case. */
if (zpool_vdev_degrade(zhp, (uint64_t)m_vdevGUID,
VDEV_AUX_ERR_EXCEEDED) == 0) {
syslog(LOG_INFO, "Degrading vdev(%s/%s)",
PoolGUIDString().c_str(),
VdevGUIDString().c_str());
Close();
return;
}
else {
syslog(LOG_ERR, "Degrade vdev(%s/%s): %s: %s\n",
PoolGUIDString().c_str(),
VdevGUIDString().c_str(),
libzfs_error_action(g_zfsHandle),
libzfs_error_description(g_zfsHandle));
}
}
Serialize();
}
Vdev
CaseFile::BeingReplacedBy(zpool_handle_t *zhp) {
Vdev vd(zhp, CaseVdev(zhp));
std::list<Vdev> children;
std::list<Vdev>::iterator children_it;
Vdev parent(vd.Parent());
Vdev replacing(NonexistentVdev);
/*
* To determine whether we are being replaced by another spare that
* is still working, then make sure that it is currently spared and
* that the spare is either resilvering or healthy. If any of these
* conditions fail, then we are not being replaced by a spare.
*
* If the spare is healthy, then the case file should be closed very
* soon after this check.
*/
if (parent.DoesNotExist()
|| parent.Name(zhp, /*verbose*/false) != "spare")
return (NonexistentVdev);
children = parent.Children();
children_it = children.begin();
for (;children_it != children.end(); children_it++) {
Vdev child = *children_it;
/* Skip our vdev. */
if (child.GUID() == VdevGUID())
continue;
/*
* Accept the first child that doesn't match our GUID, or
* any resilvering/healthy device if one exists.
*/
if (replacing.DoesNotExist() || child.IsResilvering()
|| child.State() == VDEV_STATE_HEALTHY)
replacing = child;
}
return (replacing);
}
bool
CaseFile::Replace(const char* vdev_type, const char* path, bool isspare) {
nvlist_t *nvroot, *newvd;
const char *poolname;
string oldstr(VdevGUIDString());
bool retval = true;
/* Figure out what pool we're working on */
ZpoolList zpl(ZpoolList::ZpoolByGUID, &m_poolGUID);
zpool_handle_t *zhp(zpl.empty() ? NULL : zpl.front());
if (zhp == NULL) {
syslog(LOG_ERR, "CaseFile::Replace: could not find pool for "
"pool_guid %" PRIu64 ".", (uint64_t)m_poolGUID);
return (false);
}
poolname = zpool_get_name(zhp);
Vdev vd(zhp, CaseVdev(zhp));
Vdev replaced(BeingReplacedBy(zhp));
if (isspare && !vd.IsSpare() && !replaced.DoesNotExist()) {
/* If we are already being replaced by a working spare, pass. */
if (replaced.IsResilvering()
|| replaced.State() == VDEV_STATE_HEALTHY) {
syslog(LOG_INFO, "CaseFile::Replace(%s->%s): already "
"replaced", VdevGUIDString().c_str(), path);
return (/*consumed*/false);
}
/*
* If we have already been replaced by a spare, but that spare
* is broken, we must spare the spare, not the original device.
*/
oldstr = replaced.GUIDString();
syslog(LOG_INFO, "CaseFile::Replace(%s->%s): sparing "
"broken spare %s instead", VdevGUIDString().c_str(),
path, oldstr.c_str());
}
/*
* Build a root vdev/leaf vdev configuration suitable for
* zpool_vdev_attach. Only enough data for the kernel to find
* the device (i.e. type and disk device node path) are needed.
*/
nvroot = NULL;
newvd = NULL;
if (nvlist_alloc(&nvroot, NV_UNIQUE_NAME, 0) != 0
|| nvlist_alloc(&newvd, NV_UNIQUE_NAME, 0) != 0) {
syslog(LOG_ERR, "Replace vdev(%s/%s): Unable to allocate "
"configuration data.", poolname, oldstr.c_str());
if (nvroot != NULL)
nvlist_free(nvroot);
return (false);
}
if (nvlist_add_string(newvd, ZPOOL_CONFIG_TYPE, vdev_type) != 0
|| nvlist_add_string(newvd, ZPOOL_CONFIG_PATH, path) != 0
|| nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE, VDEV_TYPE_ROOT) != 0
|| nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
&newvd, 1) != 0) {
syslog(LOG_ERR, "Replace vdev(%s/%s): Unable to initialize "
"configuration data.", poolname, oldstr.c_str());
nvlist_free(newvd);
nvlist_free(nvroot);
return (true);
}
/* Data was copied when added to the root vdev. */
nvlist_free(newvd);
retval = (zpool_vdev_attach(zhp, oldstr.c_str(), path, nvroot,
/*replace*/B_TRUE) == 0);
if (retval)
syslog(LOG_INFO, "Replacing vdev(%s/%s) with %s\n",
poolname, oldstr.c_str(), path);
else
syslog(LOG_ERR, "Replace vdev(%s/%s): %s: %s\n",
poolname, oldstr.c_str(), libzfs_error_action(g_zfsHandle),
libzfs_error_description(g_zfsHandle));
nvlist_free(nvroot);
return (retval);
}
/* Does the argument event refer to a checksum error? */
static bool
IsChecksumEvent(const Event* const event)
{
return ("ereport.fs.zfs.checksum" == event->Value("type"));
}
/* Does the argument event refer to an IO error? */
static bool
IsIOEvent(const Event* const event)
{
return ("ereport.fs.zfs.io" == event->Value("type"));
}
bool
CaseFile::ShouldDegrade() const
{
return (std::count_if(m_events.begin(), m_events.end(),
IsChecksumEvent) > ZFS_DEGRADE_IO_COUNT);
}
bool
CaseFile::ShouldFault() const
{
return (std::count_if(m_events.begin(), m_events.end(),
IsIOEvent) > ZFS_DEGRADE_IO_COUNT);
}
nvlist_t *
CaseFile::CaseVdev(zpool_handle_t *zhp) const
{
return (VdevIterator(zhp).Find(VdevGUID()));
}
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