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Re: [libvirt] [PATCH V3] libxl: provide integration with lock manager



Jim Fehlig wrote:
> Provide integration with libvirt's lock manager in the libxl driver.
>
> Signed-off-by: Jim Fehlig <jfehlig suse com>
> ---
>
> V3 of
>
> https://www.redhat.com/archives/libvir-list/2015-April/msg01006.html
>
> In V3, call virDomainLockProcessStart() with 'paused' parameter
> set to 'true' and add a call to virDomainLockProcessResume().
>
>  src/Makefile.am                      | 12 +++++++++
>  src/libxl/libvirtd_libxl.aug         |  2 ++
>  src/libxl/libxl.conf                 | 10 +++++++
>  src/libxl/libxl_conf.c               | 14 ++++++++++
>  src/libxl/libxl_conf.h               |  6 +++++
>  src/libxl/libxl_domain.c             | 51 +++++++++++++++++++++++++++++++++++-
>  src/libxl/libxl_domain.h             |  1 +
>  src/libxl/libxl_driver.c             | 25 ++++++++++++++++++
>  src/libxl/libxl_migration.c          |  6 +++++
>  src/libxl/test_libvirtd_libxl.aug.in |  1 +
>  10 files changed, 127 insertions(+), 1 deletion(-)
>   

Any comments on this patch?  The other two patches in original V1 have
been pushed, and I'd like to push this one for 1.2.15 if there are no
additional comments.

Regards,
Jim

> diff --git a/src/Makefile.am b/src/Makefile.am
> index 9a5f16c..1438174 100644
> --- a/src/Makefile.am
> +++ b/src/Makefile.am
> @@ -2246,6 +2246,12 @@ BUILT_SOURCES += locking/qemu-lockd.conf
>  DISTCLEANFILES += locking/qemu-lockd.conf
>  endif WITH_QEMU
>  
> +if WITH_LIBXL
> +nodist_conf_DATA += locking/libxl-lockd.conf
> +BUILT_SOURCES += locking/libxl-lockd.conf
> +DISTCLEANFILES += locking/libxl-lockd.conf
> +endif WITH_LIBXL
> +
>  locking/%-lockd.conf: $(srcdir)/locking/lockd.conf
>  	$(AM_V_GEN)$(MKDIR_P) locking ; \
>  	cp $< $@
> @@ -2431,6 +2437,12 @@ nodist_conf_DATA += locking/qemu-sanlock.conf
>  BUILT_SOURCES += locking/qemu-sanlock.conf
>  DISTCLEANFILES += locking/qemu-sanlock.conf
>  endif WITH_QEMU
> +
> +if WITH_LIBXL
> +nodist_conf_DATA += locking/libxl-sanlock.conf
> +BUILT_SOURCES += locking/libxl-sanlock.conf
> +DISTCLEANFILES += locking/libxl-sanlock.conf
> +endif WITH_LIBXL
>  else ! WITH_SANLOCK
>  EXTRA_DIST += $(LOCK_DRIVER_SANLOCK_SOURCES)
>  endif ! WITH_SANLOCK
> diff --git a/src/libxl/libvirtd_libxl.aug b/src/libxl/libvirtd_libxl.aug
> index f225954..d5aa150 100644
> --- a/src/libxl/libvirtd_libxl.aug
> +++ b/src/libxl/libvirtd_libxl.aug
> @@ -25,9 +25,11 @@ module Libvirtd_libxl =
>  
>     (* Config entry grouped by function - same order as example config *)
>     let autoballoon_entry = bool_entry "autoballoon"
> +   let lock_entry = str_entry "lock_manager"
>  
>     (* Each entry in the config is one of the following ... *)
>     let entry = autoballoon_entry
> +             | lock_entry
>  
>     let comment = [ label "#comment" . del /#[ \t]*/ "# " .  store /([^ \t\n][^\n]*)?/ . del /\n/ "\n" ]
>     let empty = [ label "#empty" . eol ]
> diff --git a/src/libxl/libxl.conf b/src/libxl/libxl.conf
> index c104d40..ba3de7a 100644
> --- a/src/libxl/libxl.conf
> +++ b/src/libxl/libxl.conf
> @@ -10,3 +10,13 @@
>  # autoballoon setting.
>  #
>  #autoballoon = 1
> +
> +
> +# In order to prevent accidentally starting two domains that
> +# share one writable disk, libvirt offers two approaches for
> +# locking files: sanlock and virtlockd.  sanlock is an external
> +# project which libvirt integrates with via the libvirt-lock-sanlock
> +# package.  virtlockd is a libvirt implementation that is enabled with
> +# "lockd".  Accepted values are "sanlock" and "lockd".
> +#
> +#lock_manager = "lockd"
> diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
> index 1b504fa..29498d5 100644
> --- a/src/libxl/libxl_conf.c
> +++ b/src/libxl/libxl_conf.c
> @@ -102,6 +102,7 @@ libxlDriverConfigDispose(void *obj)
>      VIR_FREE(cfg->libDir);
>      VIR_FREE(cfg->saveDir);
>      VIR_FREE(cfg->autoDumpDir);
> +    VIR_FREE(cfg->lockManagerName);
>  }
>  
>  
> @@ -1495,6 +1496,7 @@ int libxlDriverConfigLoadFile(libxlDriverConfigPtr cfg,
>                                const char *filename)
>  {
>      virConfPtr conf = NULL;
> +    virConfValuePtr p;
>      int ret = -1;
>  
>      /* Check the file is readable before opening it, otherwise
> @@ -1512,6 +1514,18 @@ int libxlDriverConfigLoadFile(libxlDriverConfigPtr cfg,
>      if (libxlGetAutoballoonConf(cfg, conf) < 0)
>          goto cleanup;
>  
> +    if ((p = virConfGetValue(conf, "lock_manager"))) {
> +        if (p->type != VIR_CONF_STRING) {
> +            virReportError(VIR_ERR_INTERNAL_ERROR,
> +                           "%s",
> +                           _("Unexpected type for 'lock_manager' setting"));
> +            goto cleanup;
> +        }
> +
> +        if (VIR_STRDUP(cfg->lockManagerName, p->str) < 0)
> +            goto cleanup;
> +    }
> +
>      ret = 0;
>  
>   cleanup:
> diff --git a/src/libxl/libxl_conf.h b/src/libxl/libxl_conf.h
> index 5ba1a71..0a1c0db 100644
> --- a/src/libxl/libxl_conf.h
> +++ b/src/libxl/libxl_conf.h
> @@ -38,6 +38,7 @@
>  # include "virobject.h"
>  # include "virchrdev.h"
>  # include "virhostdev.h"
> +# include "locking/lock_manager.h"
>  
>  # define LIBXL_DRIVER_NAME "xenlight"
>  # define LIBXL_VNC_PORT_MIN  5900
> @@ -98,6 +99,8 @@ struct _libxlDriverConfig {
>       * memory for new domains from domain0. */
>      bool autoballoon;
>  
> +    char *lockManagerName;
> +
>      /* Once created, caps are immutable */
>      virCapsPtr caps;
>  
> @@ -144,6 +147,9 @@ struct _libxlDriverPrivate {
>  
>      /* Immutable pointer, lockless APIs*/
>      virSysinfoDefPtr hostsysinfo;
> +
> +    /* Immutable pointer. lockless access */
> +    virLockManagerPluginPtr lockManager;
>  };
>  
>  # define LIBXL_SAVE_MAGIC "libvirt-xml\n \0 \r"
> diff --git a/src/libxl/libxl_domain.c b/src/libxl/libxl_domain.c
> index 3039427..5f5f8e5 100644
> --- a/src/libxl/libxl_domain.c
> +++ b/src/libxl/libxl_domain.c
> @@ -34,6 +34,7 @@
>  #include "virlog.h"
>  #include "virstring.h"
>  #include "virtime.h"
> +#include "locking/domain_lock.h"
>  
>  #define VIR_FROM_THIS VIR_FROM_LIBXL
>  
> @@ -217,12 +218,36 @@ libxlDomainObjPrivateFree(void *data)
>  {
>      libxlDomainObjPrivatePtr priv = data;
>  
> +    VIR_FREE(priv->lockState);
>      virObjectUnref(priv);
>  }
>  
> +static int
> +libxlDomainObjPrivateXMLParse(xmlXPathContextPtr ctxt, void *data)
> +{
> +    libxlDomainObjPrivatePtr priv = data;
> +
> +    priv->lockState = virXPathString("string(./lockstate)", ctxt);
> +
> +    return 0;
> +}
> +
> +static int
> +libxlDomainObjPrivateXMLFormat(virBufferPtr buf, void *data)
> +{
> +    libxlDomainObjPrivatePtr priv = data;
> +
> +    if (priv->lockState)
> +        virBufferAsprintf(buf, "<lockstate>%s</lockstate>\n", priv->lockState);
> +
> +    return 0;
> +}
> +
>  virDomainXMLPrivateDataCallbacks libxlDomainXMLPrivateDataCallbacks = {
>      .alloc = libxlDomainObjPrivateAlloc,
>      .free = libxlDomainObjPrivateFree,
> +    .parse = libxlDomainObjPrivateXMLParse,
> +    .format = libxlDomainObjPrivateXMLFormat,
>  };
>  
>  
> @@ -667,6 +692,11 @@ libxlDomainCleanup(libxlDriverPrivatePtr driver,
>      virHostdevReAttachDomainDevices(hostdev_mgr, LIBXL_DRIVER_NAME,
>                                      vm->def, VIR_HOSTDEV_SP_PCI, NULL);
>  
> +    VIR_FREE(priv->lockState);
> +    if (virDomainLockProcessPause(driver->lockManager, vm, &priv->lockState) < 0)
> +        VIR_WARN("Unable to release lease on %s", vm->def->name);
> +    VIR_DEBUG("Preserving lock state '%s'", NULLSTR(priv->lockState));
> +
>      vm->def->id = -1;
>  
>      if (priv->deathW) {
> @@ -960,6 +990,20 @@ libxlDomainStart(libxlDriverPrivatePtr driver, virDomainObjPtr vm,
>                                         vm->def, VIR_HOSTDEV_SP_PCI) < 0)
>          goto cleanup;
>  
> +    if (virDomainLockProcessStart(driver->lockManager,
> +                                  "xen:///system",
> +                                  vm,
> +                                  true,
> +                                  NULL) < 0)
> +        goto cleanup;
> +
> +    if (virDomainLockProcessResume(driver->lockManager,
> +                                  "xen:///system",
> +                                  vm,
> +                                  priv->lockState) < 0)
> +        goto cleanup;
> +    VIR_FREE(priv->lockState);
> +
>      /* Unlock virDomainObj while creating the domain */
>      virObjectUnlock(vm);
>  
> @@ -990,7 +1034,7 @@ libxlDomainStart(libxlDriverPrivatePtr driver, virDomainObjPtr vm,
>              virReportError(VIR_ERR_INTERNAL_ERROR,
>                             _("libxenlight failed to restore domain '%s'"),
>                             d_config.c_info.name);
> -        goto cleanup;
> +        goto release_dom;
>      }
>  
>      /*
> @@ -1003,6 +1047,7 @@ libxlDomainStart(libxlDriverPrivatePtr driver, virDomainObjPtr vm,
>      if (libxl_evenable_domain_death(cfg->ctx, vm->def->id, 0, &priv->deathW))
>          goto cleanup_dom;
>  
> +
>      if ((dom_xml = virDomainDefFormat(vm->def, 0)) == NULL)
>          goto cleanup_dom;
>  
> @@ -1040,6 +1085,7 @@ libxlDomainStart(libxlDriverPrivatePtr driver, virDomainObjPtr vm,
>      goto cleanup;
>  
>   cleanup_dom:
> +    ret = -1;
>      if (priv->deathW) {
>          libxl_evdisable_domain_death(cfg->ctx, priv->deathW);
>          priv->deathW = NULL;
> @@ -1048,6 +1094,9 @@ libxlDomainStart(libxlDriverPrivatePtr driver, virDomainObjPtr vm,
>      vm->def->id = -1;
>      virDomainObjSetState(vm, VIR_DOMAIN_SHUTOFF, VIR_DOMAIN_SHUTOFF_FAILED);
>  
> + release_dom:
> +    virDomainLockProcessPause(driver->lockManager, vm, &priv->lockState);
> +
>   cleanup:
>      libxl_domain_config_dispose(&d_config);
>      VIR_FREE(dom_xml);
> diff --git a/src/libxl/libxl_domain.h b/src/libxl/libxl_domain.h
> index aa647b8..8c73cc4 100644
> --- a/src/libxl/libxl_domain.h
> +++ b/src/libxl/libxl_domain.h
> @@ -64,6 +64,7 @@ struct _libxlDomainObjPrivate {
>      virChrdevsPtr devs;
>      libxl_evgen_domain_death *deathW;
>      unsigned short migrationPort;
> +    char *lockState;
>  
>      struct libxlDomainJobObj job;
>  };
> diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
> index 6a54c73..1ecfd71 100644
> --- a/src/libxl/libxl_driver.c
> +++ b/src/libxl/libxl_driver.c
> @@ -57,6 +57,7 @@
>  #include "viratomic.h"
>  #include "virhostdev.h"
>  #include "network/bridge_driver.h"
> +#include "locking/domain_lock.h"
>  
>  #define VIR_FROM_THIS VIR_FROM_LIBXL
>  
> @@ -411,6 +412,7 @@ libxlStateCleanup(void)
>      virObjectUnref(libxl_driver->domains);
>      virObjectUnref(libxl_driver->reservedVNCPorts);
>      virObjectUnref(libxl_driver->migrationPorts);
> +    virLockManagerPluginUnref(libxl_driver->lockManager);
>  
>      virObjectEventStateFree(libxl_driver->domainEventState);
>      virSysinfoDefFree(libxl_driver->hostsysinfo);
> @@ -590,6 +592,14 @@ libxlStateInitialize(bool privileged,
>          goto error;
>      }
>  
> +    if (!(libxl_driver->lockManager =
> +          virLockManagerPluginNew(cfg->lockManagerName ?
> +                                  cfg->lockManagerName : "nop",
> +                                  "libxl",
> +                                  cfg->configBaseDir,
> +                                  0)))
> +        goto error;
> +
>      /* read the host sysinfo */
>      libxl_driver->hostsysinfo = virSysinfoRead();
>  
> @@ -2860,11 +2870,21 @@ libxlDomainAttachDeviceDiskLive(virDomainObjPtr vm, virDomainDeviceDefPtr dev)
>                  if (libxlMakeDisk(l_disk, &x_disk) < 0)
>                      goto cleanup;
>  
> +                if (virDomainLockDiskAttach(libxl_driver->lockManager,
> +                                            "xen:///system",
> +                                            vm, l_disk) < 0)
> +                    goto cleanup;
> +
>                  if ((ret = libxl_device_disk_add(cfg->ctx, vm->def->id,
>                                                  &x_disk, NULL)) < 0) {
>                      virReportError(VIR_ERR_INTERNAL_ERROR,
>                                     _("libxenlight failed to attach disk '%s'"),
>                                     l_disk->dst);
> +                    if (virDomainLockDiskDetach(libxl_driver->lockManager,
> +                                                vm, l_disk) < 0) {
> +                        VIR_WARN("Unable to release lock on %s",
> +                                 virDomainDiskGetSource(l_disk));
> +                    }
>                      goto cleanup;
>                  }
>  
> @@ -3005,6 +3025,11 @@ libxlDomainDetachDeviceDiskLive(virDomainObjPtr vm, virDomainDeviceDefPtr dev)
>                      goto cleanup;
>                  }
>  
> +                if (virDomainLockDiskDetach(libxl_driver->lockManager,
> +                                            vm, l_disk) < 0)
> +                    VIR_WARN("Unable to release lock on %s",
> +                             virDomainDiskGetSource(l_disk));
> +
>                  virDomainDiskRemove(vm->def, idx);
>                  virDomainDiskDefFree(l_disk);
>  
> diff --git a/src/libxl/libxl_migration.c b/src/libxl/libxl_migration.c
> index 51993c6..1efd98f 100644
> --- a/src/libxl/libxl_migration.c
> +++ b/src/libxl/libxl_migration.c
> @@ -41,6 +41,7 @@
>  #include "libxl_driver.h"
>  #include "libxl_conf.h"
>  #include "libxl_migration.h"
> +#include "locking/domain_lock.h"
>  
>  #define VIR_FROM_THIS VIR_FROM_LIBXL
>  
> @@ -469,6 +470,7 @@ libxlDomainMigrationPerform(libxlDriverPrivatePtr driver,
>                              const char *dname ATTRIBUTE_UNUSED,
>                              unsigned int flags)
>  {
> +    libxlDomainObjPrivatePtr priv = vm->privateData;
>      char *hostname = NULL;
>      unsigned short port = 0;
>      char portstr[100];
> @@ -503,6 +505,10 @@ libxlDomainMigrationPerform(libxlDriverPrivatePtr driver,
>      sockfd = virNetSocketDupFD(sock, true);
>      virObjectUnref(sock);
>  
> +    if (virDomainLockProcessPause(driver->lockManager, vm, &priv->lockState) < 0)
> +        VIR_WARN("Unable to release lease on %s", vm->def->name);
> +    VIR_DEBUG("Preserving lock state '%s'", NULLSTR(priv->lockState));
> +
>      /* suspend vm and send saved data to dst through socket fd */
>      virObjectUnlock(vm);
>      ret = libxlDoMigrateSend(driver, vm, flags, sockfd);
> diff --git a/src/libxl/test_libvirtd_libxl.aug.in b/src/libxl/test_libvirtd_libxl.aug.in
> index 23e667c..baa8c79 100644
> --- a/src/libxl/test_libvirtd_libxl.aug.in
> +++ b/src/libxl/test_libvirtd_libxl.aug.in
> @@ -3,3 +3,4 @@ module Test_libvirtd_libxl =
>  
>     test Libvirtd_libxl.lns get conf =
>  { "autoballoon" = "1" }
> +{ "lock_manager" = "lockd" }
>   


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