Re: [libvirt] [PATCH 3/8] backup: Introduce virDomainCheckpointPtr

Prepare for introducing a bunch of new public APIs related to backup checkpoints by first introducing a new internal type and errors associated with that type. Checkpoints are modeled heavily after virDomainSnapshotPtr (both represent a point in time of the guest), although a snapshot exists with the intent of rolling back to that state, while a checkpoint exists to make it possible to create an incremental backup at a later time. Signed-off-by: Eric Blake <eblake(a)redhat.com&gt; --- include/libvirt/libvirt-domain-snapshot.h | 8 ++-- include/libvirt/libvirt.h | 2 + include/libvirt/virterror.h | 5 ++- src/datatypes.c | 62 ++++++++++++++++++++++++++++++- src/datatypes.h | 31 +++++++++++++++- src/libvirt_private.syms | 2 + src/util/virerror.c | 15 +++++++- 7 files changed, 118 insertions(+), 7 deletions(-) diff --git a/include/libvirt/libvirt-domain-snapshot.h b/include/libvirt/libvirt-domain-snapshot.h index e5a893a767..ff1e890cfc 100644 --- a/include/libvirt/libvirt-domain-snapshot.h +++ b/include/libvirt/libvirt-domain-snapshot.h @@ -31,15 +31,17 @@ /** * virDomainSnapshot: * - * a virDomainSnapshot is a private structure representing a snapshot of - * a domain. + * A virDomainSnapshot is a private structure representing a snapshot of + * a domain. A snapshot captures the state of the domain at a point in + * time, with the intent that the guest can be reverted back to that + * state at a later time.

*/ typedef struct _virDomainSnapshot virDomainSnapshot; /** * virDomainSnapshotPtr: * - * a virDomainSnapshotPtr is pointer to a virDomainSnapshot private structure, + * A virDomainSnapshotPtr is pointer to a virDomainSnapshot private structure, * and is the type used to reference a domain snapshot in the API. */

typedef virDomainSnapshot *virDomainSnapshotPtr; diff --git a/include/libvirt/libvirt.h b/include/libvirt/libvirt.h index 36f6d60775..26887a40e7 100644 --- a/include/libvirt/libvirt.h +++ b/include/libvirt/libvirt.h @@ -36,6 +36,8 @@ extern "C" { # include <libvirt/libvirt-common.h> # include <libvirt/libvirt-host.h> # include <libvirt/libvirt-domain.h> +typedef struct _virDomainCheckpoint virDomainCheckpoint; +typedef virDomainCheckpoint *virDomainCheckpointPtr; # include <libvirt/libvirt-domain-snapshot.h> # include <libvirt/libvirt-event.h> # include <libvirt/libvirt-interface.h> diff --git a/include/libvirt/virterror.h b/include/libvirt/virterror.h index 5e58b6a3f9..87ac16be0b 100644 --- a/include/libvirt/virterror.h +++ b/include/libvirt/virterror.h @@ -4,7 +4,7 @@ * Description: Provides the interfaces of the libvirt library to handle * errors raised while using the library. * - * Copyright (C) 2006-2016 Red Hat, Inc. + * Copyright (C) 2006-2018 Red Hat, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public @@ -133,6 +133,7 @@ typedef enum { VIR_FROM_PERF = 65, /* Error from perf */ VIR_FROM_LIBSSH = 66, /* Error from libssh connection transport */ VIR_FROM_RESCTRL = 67, /* Error from resource control */ + VIR_FROM_DOMAIN_CHECKPOINT = 68,/* Error from domain checkpoint */ # ifdef VIR_ENUM_SENTINELS VIR_ERR_DOMAIN_LAST @@ -321,6 +322,8 @@ typedef enum { to guest-sync command (DEPRECATED)*/ VIR_ERR_LIBSSH = 98, /* error in libssh transport driver */ VIR_ERR_DEVICE_MISSING = 99, /* fail to find the desired device */ + VIR_ERR_INVALID_DOMAIN_CHECKPOINT = 100,/* invalid domain checkpoint */

/** diff --git a/src/datatypes.c b/src/datatypes.c index 09b8eea5a2..3c9069c938 100644 --- a/src/datatypes.c +++ b/src/datatypes.c @@ -1,7 +1,7 @@ /* * datatypes.c: management of structs for public data types * - * Copyright (C) 2006-2015 Red Hat, Inc. + * Copyright (C) 2006-2018 Red Hat, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public @@ -36,6 +36,7 @@ VIR_LOG_INIT("datatypes"); virClassPtr virConnectClass; virClassPtr virConnectCloseCallbackDataClass; virClassPtr virDomainClass; +virClassPtr virDomainCheckpointClass; virClassPtr virDomainSnapshotClass; virClassPtr virInterfaceClass; virClassPtr virNetworkClass; @@ -49,6 +50,7 @@ virClassPtr virStoragePoolClass; static void virConnectDispose(void *obj); static void virConnectCloseCallbackDataDispose(void *obj); static void virDomainDispose(void *obj); +static void virDomainCheckpointDispose(void *obj); static void virDomainSnapshotDispose(void *obj); static void virInterfaceDispose(void *obj); static void virNetworkDispose(void *obj); @@ -84,6 +86,7 @@ virDataTypesOnceInit(void) DECLARE_CLASS_LOCKABLE(virConnect); DECLARE_CLASS_LOCKABLE(virConnectCloseCallbackData); DECLARE_CLASS(virDomain); + DECLARE_CLASS(virDomainCheckpoint); DECLARE_CLASS(virDomainSnapshot); DECLARE_CLASS(virInterface); DECLARE_CLASS(virNetwork); @@ -887,6 +890,63 @@ virDomainSnapshotDispose(void *obj) } +/** + * virGetDomainCheckpoint: + * @domain: the domain to checkpoint + * @name: pointer to the domain checkpoint name + * + * Allocates a new domain checkpoint object. When the object is no longer needed, + * virObjectUnref() must be called in order to not leak data. + * + * Returns a pointer to the domain checkpoint object, or NULL on error. + */ +virDomainCheckpointPtr +virGetDomainCheckpoint(virDomainPtr domain, const char *name) +{ + virDomainCheckpointPtr ret = NULL; + + if (virDataTypesInitialize() < 0) + return NULL; + + virCheckDomainGoto(domain, error); + virCheckNonNullArgGoto(name, error);

+ if (!(ret = virObjectNew(virDomainCheckpointClass))) + goto error; + if (VIR_STRDUP(ret->name, name) < 0) + goto error; + + ret->domain = virObjectRef(domain); + + return ret; + + error: + virObjectUnref(ret); + return NULL; +} + + +/** + * virDomainCheckpointDispose: + * @obj: the domain checkpoint to release + * + * Unconditionally release all memory associated with a checkpoint. + * The checkpoint object must not be used once this method returns. + * + * It will also unreference the associated connection object, + * which may also be released if its ref count hits zero. + */ +static void +virDomainCheckpointDispose(void *obj) +{ + virDomainCheckpointPtr checkpoint = obj; + VIR_DEBUG("release checkpoint %p %s", checkpoint, checkpoint->name); + + VIR_FREE(checkpoint->name); + virObjectUnref(checkpoint->domain); +} + + virAdmConnectPtr virAdmConnectNew(void) { diff --git a/src/datatypes.h b/src/datatypes.h index 192c86be80..fbe842d105 100644 --- a/src/datatypes.h +++ b/src/datatypes.h @@ -1,7 +1,7 @@ /* * datatypes.h: management of structs for public data types * - * Copyright (C) 2006-2015 Red Hat, Inc. + * Copyright (C) 2006-2018 Red Hat, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public @@ -31,6 +31,7 @@ extern virClassPtr virConnectClass; extern virClassPtr virDomainClass; +extern virClassPtr virDomainCheckpointClass; extern virClassPtr virDomainSnapshotClass; extern virClassPtr virInterfaceClass; extern virClassPtr virNetworkClass; @@ -292,6 +293,21 @@ extern virClassPtr virAdmClientClass; } \ } while (0) +# define virCheckDomainCheckpointReturn(obj, retval) \ + do { \ + virDomainCheckpointPtr _check = (obj); \ + if (!virObjectIsClass(_check, virDomainCheckpointClass) || \ + !virObjectIsClass(_check->domain, virDomainClass) || \ + !virObjectIsClass(_check->domain->conn, virConnectClass)) { \ + virReportErrorHelper(VIR_FROM_DOMAIN_CHECKPOINT, \ + VIR_ERR_INVALID_DOMAIN_CHECKPOINT, \ + __FILE__, __FUNCTION__, __LINE__, \ + __FUNCTION__); \

+ virDispatchError(NULL); \ + return retval; \ + } \ + } while (0) + /* Helper macros to implement VIR_DOMAIN_DEBUG using just C99. This * assumes you pass fewer than 15 arguments to VIR_DOMAIN_DEBUG, but @@ -652,6 +668,17 @@ struct _virStream { void *privateData; }; +/** + * _virDomainCheckpoint + * + * Internal structure associated with a domain checkpoint + */ +struct _virDomainCheckpoint { + virObject parent; + char *name; + virDomainPtr domain; +}; + /** * _virDomainSnapshot * @@ -712,6 +739,8 @@ virStreamPtr virGetStream(virConnectPtr conn); virNWFilterPtr virGetNWFilter(virConnectPtr conn, const char *name, const unsigned char *uuid); +virDomainCheckpointPtr virGetDomainCheckpoint(virDomainPtr domain, + const char *name);

virDomainSnapshotPtr virGetDomainSnapshot(virDomainPtr domain, const char *name); diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index ea24f2847c..4686c775a5 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -1183,10 +1183,12 @@ virConnectCloseCallbackDataClass; virConnectCloseCallbackDataGetCallback; virConnectCloseCallbackDataRegister; virConnectCloseCallbackDataUnregister; +virDomainCheckpointClass; virDomainClass; virDomainSnapshotClass; virGetConnect; virGetDomain; +virGetDomainCheckpoint; virGetDomainSnapshot; virGetInterface; virGetNetwork; diff --git a/src/util/virerror.c b/src/util/virerror.c index 93632dbdf7..1e6fd77abf 100644 --- a/src/util/virerror.c +++ b/src/util/virerror.c @@ -1,7 +1,7 @@ /* * virerror.c: error handling and reporting code for libvirt * - * Copyright (C) 2006, 2008-2016 Red Hat, Inc. + * Copyright (C) 2006, 2008-2018 Red Hat, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public @@ -140,6 +140,7 @@ VIR_ENUM_IMPL(virErrorDomain, VIR_ERR_DOMAIN_LAST, "Perf", /* 65 */ "Libssh transport layer", "Resource control", + "Domain Checkpoint", ) @@ -1494,6 +1495,18 @@ virErrorMsg(virErrorNumber error, const char *info) else errmsg = _("device not found: %s"); break; + case VIR_ERR_INVALID_DOMAIN_CHECKPOINT: + if (info == NULL) + errmsg = _("Invalid checkpoint"); + else + errmsg = _("Invalid checkpoint: %s"); + break; + case VIR_ERR_NO_DOMAIN_CHECKPOINT: + if (info == NULL) + errmsg = _("Domain snapshot not found"); + else + errmsg = _("Domain snapshot not found: %s"); + break; } return errmsg; } -- 2.14.4