[libvirt] Supporting vhost-net and macvtap in libvirt for QEMU
by Anthony Liguori
Disclaimer: I am neither an SR-IOV nor a vhost-net expert, but I've CC'd
people that are who can throw tomatoes at me for getting bits wrong :-)
I wanted to start a discussion about supporting vhost-net in libvirt.
vhost-net has not yet been merged into qemu but I expect it will be soon
so it's a good time to start this discussion.
There are two modes worth supporting for vhost-net in libvirt. The
first mode is where vhost-net backs to a tun/tap device. This is
behaves in very much the same way that -net tap behaves in qemu today.
Basically, the difference is that the virtio backend is in the kernel
instead of in qemu so there should be some performance improvement.
Current, libvirt invokes qemu with -net tap,fd=X where X is an already
open fd to a tun/tap device. I suspect that after we merge vhost-net,
libvirt could support vhost-net in this mode by just doing -net
vhost,fd=X. I think the only real question for libvirt is whether to
provide a user visible switch to use vhost or to just always use vhost
when it's available and it makes sense. Personally, I think the later
makes sense.
The more interesting invocation of vhost-net though is one where the
vhost-net device backs directly to a physical network card. In this
mode, vhost should get considerably better performance than the current
implementation. I don't know the syntax yet, but I think it's
reasonable to assume that it will look something like -net
tap,dev=eth0. The effect will be that eth0 is dedicated to the guest.
On most modern systems, there is a small number of network devices so
this model is not all that useful except when dealing with SR-IOV
adapters. In that case, each physical device can be exposed as many
virtual devices (VFs). There are a few restrictions here though. The
biggest is that currently, you can only change the number of VFs by
reloading a kernel module so it's really a parameter that must be set at
startup time.
I think there are a few ways libvirt could support vhost-net in this
second mode. The simplest would be to introduce a new tag similar to
<source network='br0'>. In fact, if you probed the device type for the
network parameter, you could probably do something like <source
network='eth0'> and have it Just Work.
Another model would be to have libvirt see an SR-IOV adapter as a
network pool whereas it handled all of the VF management. Considering
how inflexible SR-IOV is today, I'm not sure whether this is the best model.
Has anyone put any more thought into this problem or how this should be
modeled in libvirt? Michael, could you share your current thinking for
-net syntax?
--
Regards,
Anthony Liguori
1 year
[libvirt] [PATCH 0/4] Multiple problems with saving to block devices
by Daniel P. Berrange
This patch series makes it possible to save to a block device,
instead of a plain file. There were multiple problems
- WHen save failed, we might de-reference a NULL pointer
- When save failed, we unlinked the device node !!
- The approach of using >> to append, doesn't work with block devices
- CGroups was blocking QEMU access to the block device when enabled
One remaining problem is not in libvirt, but rather QEMU. The QEMU
exec: based migration often fails to detect failure of the command
and will thus hang forever attempting a migration that'll never
succeed! Fortunately you can now work around this in libvirt using
the virsh domjobabort command
11 years, 8 months
[libvirt] [PATCHv4 00/51] another round of snapshot patches
by Eric Blake
I think I've addressed most findings from round 3 - by implementing
the ability to redefine a snapshot, it becomes possible to restore
snapshot hierarchy when recreating a transient domain by the same
name. New goodies in this round: several bug fixes, add virsh
snapshot-edit, drop undefine --snapshots-full (you can only remove
snapshot metadata on undefine). I tested as I went, but this went
through so many rebases that there may be some nasties that snuck
in; but I wanted to get this posted now. I also know that I'm
missing at least one major feature requested in the v3 review:
namely, transient domains _should_ auto-remove snapshot metadata
files when they halt, but right now aren't doing that.
v3 was at:
https://www.redhat.com/archives/libvir-list/2011-August/msg01132.html
Also available here:
git fetch git://repo.or.cz/libvirt/ericb.git snapshot
or browse online at:
http://repo.or.cz/w/libvirt/ericb.git/shortlog/refs/heads/snapshot
I'm also trying to group things by several bugzilla related to
various patches (looks like I still need to create a few):
Eric Blake (51):
https://bugzilla.redhat.com/show_bug.cgi?id=674537
snapshot: fix corner case on OOM during creation
https://bugzilla.redhat.com/show_bug.cgi?id=733762
snapshot: better events when starting paused
snapshot: fine-tune ability to start paused
snapshot: expose --running and --paused in virsh
snapshot: fine-tune qemu saved images starting paused
snapshot: improve reverting to qemu paused snapshots
snapshot: properly revert qemu to offline snapshots
snapshot: fine-tune qemu snapshot revert states
no bug filed yet... should be one about no stale metadata
snapshot: allow deletion of just snapshot metadata
snapshot: add snapshot-list --parent to virsh
https://bugzilla.redhat.com/show_bug.cgi?id=733529
snapshot: speed up snapshot location
snapshot: avoid crash when deleting qemu snapshots
snapshot: track current domain across deletion of children
snapshot: simplify acting on just children
no bug filed yet... should be one about no stale metadata
snapshot: let qemu discard only snapshot metadata
snapshot: identify which snapshots have metadata
snapshot: reflect new dumpxml and list options in virsh
snapshot: identify qemu snapshot roots
snapshot: allow recreation of metadata
snapshot: refactor virsh snapshot creation
snapshot: improve virsh snapshot-create, add snapshot-edit
snapshot: add qemu snapshot creation without metadata
no bug filed yet... should be one about snapshot migration
snapshot: add qemu snapshot redefine support
snapshot: prevent stranding snapshot data on domain destruction
snapshot: teach virsh about new undefine flags
snapshot: refactor some qemu code
snapshot: cache qemu-img location
snapshot: support new undefine flags in qemu
snapshot: prevent migration from stranding snapshot data
https://bugzilla.redhat.com/show_bug.cgi?id=638510
snapshot: refactor domain xml output
snapshot: allow full domain xml in snapshot
snapshot: correctly escape generated xml
snapshot: update rng to support full domain in xml
snapshot: store qemu domain details in xml
snapshot: additions to domain xml for disks
snapshot: reject transient disks where code is not ready
snapshot: introduce new deletion flag
snapshot: expose new delete flag in virsh
snapshot: allow halting after snapshot
snapshot: expose halt-after-creation in virsh
snapshot: wire up new qemu monitor command
snapshot: support extra state in snapshots
snapshot: add <disks> to snapshot xml
snapshot: also support disks by path
snapshot: add virsh domblklist command
snapshot: add flag for requesting disk snapshot
snapshot: wire up disk-only flag to snapshot-create
snapshot: reject unimplemented disk snapshot features
snapshot: make it possible to audit external snapshot
snapshot: wire up live qemu disk snapshots
snapshot: use SELinux and lock manager with external snapshots
docs/formatdomain.html.in | 40 +-
docs/formatsnapshot.html.in | 269 ++-
docs/schemas/Makefile.am | 1 +
docs/schemas/domain.rng | 2555 +-------------------
docs/schemas/{domain.rng => domaincommon.rng} | 32 +-
docs/schemas/domainsnapshot.rng | 84 +-
examples/domain-events/events-c/event-test.c | 37 +-
include/libvirt/libvirt.h.in | 66 +-
src/conf/domain_audit.c | 12 +-
src/conf/domain_audit.h | 4 +-
src/conf/domain_conf.c | 902 ++++++--
src/conf/domain_conf.h | 76 +-
src/esx/esx_driver.c | 38 +-
src/libvirt.c | 256 ++-
src/libvirt_private.syms | 8 +
src/libxl/libxl_conf.c | 5 +
src/libxl/libxl_driver.c | 11 +-
src/qemu/qemu_command.c | 5 +
src/qemu/qemu_conf.h | 1 +
src/qemu/qemu_driver.c | 1532 +++++++++---
src/qemu/qemu_hotplug.c | 18 +-
src/qemu/qemu_migration.c | 48 +-
src/qemu/qemu_migration.h | 2 -
src/qemu/qemu_monitor.c | 24 +
src/qemu/qemu_monitor.h | 4 +
src/qemu/qemu_monitor_json.c | 33 +
src/qemu/qemu_monitor_json.h | 4 +
src/qemu/qemu_monitor_text.c | 40 +
src/qemu/qemu_monitor_text.h | 4 +
src/qemu/qemu_process.c | 11 +-
src/uml/uml_driver.c | 56 +-
src/vbox/vbox_tmpl.c | 43 +-
src/xen/xend_internal.c | 12 +-
src/xenxs/xen_sxpr.c | 5 +
src/xenxs/xen_xm.c | 5 +
tests/domainsnapshotxml2xmlin/disk_snapshot.xml | 16 +
tests/domainsnapshotxml2xmlout/disk_snapshot.xml | 77 +
tests/domainsnapshotxml2xmlout/full_domain.xml | 35 +
.../qemuxml2argv-disk-snapshot.args | 7 +
.../qemuxml2argv-disk-snapshot.xml | 39 +
.../qemuxml2argv-disk-transient.xml | 27 +
tests/qemuxml2argvtest.c | 2 +
tests/virsh-optparse | 20 +
tools/virsh.c | 772 +++++-
tools/virsh.pod | 214 ++-
45 files changed, 3978 insertions(+), 3474 deletions(-)
copy docs/schemas/{domain.rng => domaincommon.rng} (98%)
create mode 100644 tests/domainsnapshotxml2xmlin/disk_snapshot.xml
create mode 100644 tests/domainsnapshotxml2xmlout/disk_snapshot.xml
create mode 100644 tests/domainsnapshotxml2xmlout/full_domain.xml
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-snapshot.args
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-snapshot.xml
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-transient.xml
--
1.7.4.4
12 years
[libvirt] Add virStorageVolResize()
by Zeeshan Ali (Khattak)
From: "Zeeshan Ali (Khattak)" <zeeshanak(a)gnome.org>
Add a new function to allow changing of capacity of storage volumes.
---
include/libvirt/libvirt.h.in | 5 ++
src/driver.h | 5 ++
src/libvirt.c | 50 +++++++++++++++++++++++
src/libvirt_public.syms | 1 +
src/remote/remote_driver.c | 1 +
src/remote/remote_protocol.x | 9 ++++-
src/remote_protocol-structs | 6 +++
src/storage/storage_backend.h | 6 +++
src/storage/storage_backend_fs.c | 59 ++++++++++++++++++++++++++++
src/storage/storage_driver.c | 80 ++++++++++++++++++++++++++++++++++++++
src/util/storage_file.c | 16 ++++++++
src/util/storage_file.h | 2 +
tools/virsh.c | 53 +++++++++++++++++++++++++
13 files changed, 292 insertions(+), 1 deletions(-)
diff --git a/include/libvirt/libvirt.h.in b/include/libvirt/libvirt.h.in
index e99cd00..b169592 100644
--- a/include/libvirt/libvirt.h.in
+++ b/include/libvirt/libvirt.h.in
@@ -2386,6 +2386,11 @@ char * virStorageVolGetXMLDesc (virStorageVolPtr pool,
char * virStorageVolGetPath (virStorageVolPtr vol);
+int virStorageVolResize (virStorageVolPtr vol,
+ unsigned long long capacity,
+ unsigned int flags);
+
+
/**
* virKeycodeSet:
*
diff --git a/src/driver.h b/src/driver.h
index df2aa60..c850926 100644
--- a/src/driver.h
+++ b/src/driver.h
@@ -1261,6 +1261,10 @@ typedef int
unsigned long long offset,
unsigned long long length,
unsigned int flags);
+typedef int
+ (*virDrvStorageVolResize) (virStorageVolPtr vol,
+ unsigned long long capacity,
+ unsigned int flags);
typedef int
(*virDrvStoragePoolIsActive)(virStoragePoolPtr pool);
@@ -1323,6 +1327,7 @@ struct _virStorageDriver {
virDrvStorageVolGetInfo volGetInfo;
virDrvStorageVolGetXMLDesc volGetXMLDesc;
virDrvStorageVolGetPath volGetPath;
+ virDrvStorageVolResize volResize;
virDrvStoragePoolIsActive poolIsActive;
virDrvStoragePoolIsPersistent poolIsPersistent;
};
diff --git a/src/libvirt.c b/src/libvirt.c
index e9d638b..d1962a2 100644
--- a/src/libvirt.c
+++ b/src/libvirt.c
@@ -12927,6 +12927,56 @@ error:
return NULL;
}
+/**
+ * virStorageVolResize:
+ * @vol: pointer to storage volume
+ * @capacity: new capacity
+ * @flags: extra flags; not used yet, so callers should always pass 0
+ *
+ * Changes the capacity of the storage volume @vol to @capacity. The new
+ * capacity must not exceed the sum of current capacity of the volume and
+ * remainining free space of its parent pool. Also the new capacity must
+ * be greater than or equal to current allocation of the volume.
+ *
+ * Returns 0 on success, or -1 on error.
+ */
+int
+virStorageVolResize(virStorageVolPtr vol,
+ unsigned long long capacity,
+ unsigned int flags)
+{
+ virConnectPtr conn;
+ VIR_DEBUG("vol=%p capacity=%llu flags=%x", vol, capacity, flags);
+
+ virResetLastError();
+
+ if (!VIR_IS_STORAGE_VOL(vol)) {
+ virLibStorageVolError(VIR_ERR_INVALID_STORAGE_VOL, __FUNCTION__);
+ virDispatchError(NULL);
+ return -1;
+ }
+
+ conn = vol->conn;
+
+ if (conn->flags & VIR_CONNECT_RO) {
+ virLibConnError(VIR_ERR_OPERATION_DENIED, __FUNCTION__);
+ goto error;
+ }
+
+ if (conn->storageDriver && conn->storageDriver->volResize) {
+ int ret;
+ ret = conn->storageDriver->volResize(vol, capacity, flags);
+ if (ret < 0)
+ goto error;
+ return ret;
+ }
+
+ virLibConnError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+
+error:
+ virDispatchError(vol->conn);
+ return -1;
+}
/**
* virNodeNumOfDevices:
diff --git a/src/libvirt_public.syms b/src/libvirt_public.syms
index 1340b0c..54a4f2c 100644
--- a/src/libvirt_public.syms
+++ b/src/libvirt_public.syms
@@ -520,6 +520,7 @@ LIBVIRT_0.9.10 {
global:
virDomainShutdownFlags;
virStorageVolWipePattern;
+ virStorageVolResize;
} LIBVIRT_0.9.9;
# .... define new API here using predicted next version number ....
diff --git a/src/remote/remote_driver.c b/src/remote/remote_driver.c
index f79f53e..2bb4cbf 100644
--- a/src/remote/remote_driver.c
+++ b/src/remote/remote_driver.c
@@ -4837,6 +4837,7 @@ static virStorageDriver storage_driver = {
.volGetInfo = remoteStorageVolGetInfo, /* 0.4.1 */
.volGetXMLDesc = remoteStorageVolGetXMLDesc, /* 0.4.1 */
.volGetPath = remoteStorageVolGetPath, /* 0.4.1 */
+ .volResize = remoteStorageVolResize, /* 0.9.10 */
.poolIsActive = remoteStoragePoolIsActive, /* 0.7.3 */
.poolIsPersistent = remoteStoragePoolIsPersistent, /* 0.7.3 */
};
diff --git a/src/remote/remote_protocol.x b/src/remote/remote_protocol.x
index 0f354bb..29f98fc 100644
--- a/src/remote/remote_protocol.x
+++ b/src/remote/remote_protocol.x
@@ -1676,6 +1676,12 @@ struct remote_storage_vol_get_path_ret {
remote_nonnull_string name;
};
+struct remote_storage_vol_resize_args {
+ remote_nonnull_storage_vol vol;
+ unsigned hyper capacity;
+ unsigned int flags;
+};
+
/* Node driver calls: */
struct remote_node_num_of_devices_args {
@@ -2667,7 +2673,8 @@ enum remote_procedure {
REMOTE_PROC_DOMAIN_SET_INTERFACE_PARAMETERS = 256, /* autogen autogen */
REMOTE_PROC_DOMAIN_GET_INTERFACE_PARAMETERS = 257, /* skipgen skipgen */
REMOTE_PROC_DOMAIN_SHUTDOWN_FLAGS = 258, /* autogen autogen */
- REMOTE_PROC_STORAGE_VOL_WIPE_PATTERN = 259 /* autogen autogen */
+ REMOTE_PROC_STORAGE_VOL_WIPE_PATTERN = 259, /* autogen autogen */
+ REMOTE_PROC_STORAGE_VOL_RESIZE = 300 /* autogen autogen */
/*
* Notice how the entries are grouped in sets of 10 ?
diff --git a/src/remote_protocol-structs b/src/remote_protocol-structs
index de85862..9a60fc2 100644
--- a/src/remote_protocol-structs
+++ b/src/remote_protocol-structs
@@ -1260,6 +1260,11 @@ struct remote_storage_vol_get_path_args {
struct remote_storage_vol_get_path_ret {
remote_nonnull_string name;
};
+struct remote_storage_vol_resize_args {
+ remote_nonnull_storage_vol vol;
+ uint64_t capacity;
+ u_int flags;
+};
struct remote_node_num_of_devices_args {
remote_string cap;
u_int flags;
@@ -2101,4 +2106,5 @@ enum remote_procedure {
REMOTE_PROC_DOMAIN_GET_INTERFACE_PARAMETERS = 257,
REMOTE_PROC_DOMAIN_SHUTDOWN_FLAGS = 258,
REMOTE_PROC_STORAGE_VOL_WIPE_PATTERN = 259,
+ REMOTE_PROC_STORAGE_VOL_RESIZE = 300,
};
diff --git a/src/storage/storage_backend.h b/src/storage/storage_backend.h
index 75ed676..a37bf7c 100644
--- a/src/storage/storage_backend.h
+++ b/src/storage/storage_backend.h
@@ -44,6 +44,11 @@ typedef int (*virStorageBackendDeleteVol)(virConnectPtr conn, virStoragePoolObjP
typedef int (*virStorageBackendBuildVolFrom)(virConnectPtr conn, virStoragePoolObjPtr pool,
virStorageVolDefPtr origvol, virStorageVolDefPtr newvol,
unsigned int flags);
+typedef int (*virStorageBackendVolumeResize)(virConnectPtr conn,
+ virStoragePoolObjPtr pool,
+ virStorageVolDefPtr vol,
+ unsigned long long capacity,
+ unsigned int flags);
/* File creation/cloning functions used for cloning between backends */
int virStorageBackendCreateRaw(virConnectPtr conn,
@@ -78,6 +83,7 @@ struct _virStorageBackend {
virStorageBackendCreateVol createVol;
virStorageBackendRefreshVol refreshVol;
virStorageBackendDeleteVol deleteVol;
+ virStorageBackendVolumeResize resizeVol;
};
virStorageBackendPtr virStorageBackendForType(int type);
diff --git a/src/storage/storage_backend_fs.c b/src/storage/storage_backend_fs.c
index d8dc29c..31f7c0a 100644
--- a/src/storage/storage_backend_fs.c
+++ b/src/storage/storage_backend_fs.c
@@ -1187,6 +1187,62 @@ virStorageBackendFileSystemVolRefresh(virConnectPtr conn,
return 0;
}
+static int
+virStorageBackendFilesystemResizeQemuImg(const char *path,
+ unsigned long long capacity)
+{
+ int ret = -1;
+ char *img_tool;
+ virCommandPtr cmd = NULL;
+
+ /* KVM is usually ahead of qemu on features, so try that first */
+ img_tool = virFindFileInPath("kvm-img");
+ if (!img_tool)
+ img_tool = virFindFileInPath("qemu-img");
+
+ if (!img_tool) {
+ virStorageReportError(VIR_ERR_INTERNAL_ERROR,
+ "%s", _("unable to find kvm-img or qemu-img"));
+ return -1;
+ }
+
+ cmd = virCommandNew(img_tool);
+ virCommandAddArgList(cmd, "resize", path, NULL);
+ virCommandAddArgFormat(cmd, "%llu", capacity);
+
+ ret = virCommandRun(cmd, NULL);
+
+ VIR_FREE(img_tool);
+ virCommandFree(cmd);
+
+ return ret;
+}
+
+/**
+ * Resize a volume
+ */
+static int
+virStorageBackendFileSystemVolResize(virConnectPtr conn ATTRIBUTE_UNUSED,
+ virStoragePoolObjPtr pool ATTRIBUTE_UNUSED,
+ virStorageVolDefPtr vol,
+ unsigned long long capacity,
+ unsigned int flags)
+{
+ virCheckFlags(0, -1);
+
+ if (vol->target.format == VIR_STORAGE_FILE_RAW) {
+ return virStorageFileResize(vol->target.path, capacity);
+ } else if (vol->target.format == VIR_STORAGE_FILE_DIR) {
+ virStorageReportError(VIR_ERR_NO_SUPPORT,
+ "%s", _("Changing size of directory based "
+ "volumes is not supported"));
+ return -1;
+ } else {
+ return virStorageBackendFilesystemResizeQemuImg(vol->target.path,
+ capacity);
+ }
+}
+
virStorageBackend virStorageBackendDirectory = {
.type = VIR_STORAGE_POOL_DIR,
@@ -1199,6 +1255,7 @@ virStorageBackend virStorageBackendDirectory = {
.createVol = virStorageBackendFileSystemVolCreate,
.refreshVol = virStorageBackendFileSystemVolRefresh,
.deleteVol = virStorageBackendFileSystemVolDelete,
+ .resizeVol = virStorageBackendFileSystemVolResize,
};
#if WITH_STORAGE_FS
@@ -1216,6 +1273,7 @@ virStorageBackend virStorageBackendFileSystem = {
.createVol = virStorageBackendFileSystemVolCreate,
.refreshVol = virStorageBackendFileSystemVolRefresh,
.deleteVol = virStorageBackendFileSystemVolDelete,
+ .resizeVol = virStorageBackendFileSystemVolResize,
};
virStorageBackend virStorageBackendNetFileSystem = {
.type = VIR_STORAGE_POOL_NETFS,
@@ -1232,5 +1290,6 @@ virStorageBackend virStorageBackendNetFileSystem = {
.createVol = virStorageBackendFileSystemVolCreate,
.refreshVol = virStorageBackendFileSystemVolRefresh,
.deleteVol = virStorageBackendFileSystemVolDelete,
+ .resizeVol = virStorageBackendFileSystemVolResize,
};
#endif /* WITH_STORAGE_FS */
diff --git a/src/storage/storage_driver.c b/src/storage/storage_driver.c
index a332ada..76730b4 100644
--- a/src/storage/storage_driver.c
+++ b/src/storage/storage_driver.c
@@ -1695,7 +1695,86 @@ out:
return ret;
}
+static int
+storageVolumeResize(virStorageVolPtr obj,
+ unsigned long long capacity,
+ unsigned int flags)
+{
+ virStorageDriverStatePtr driver = obj->conn->storagePrivateData;
+ virStorageBackendPtr backend;
+ virStoragePoolObjPtr pool = NULL;
+ virStorageVolDefPtr vol = NULL;
+ int ret = -1;
+
+ virCheckFlags(0, -1);
+
+ storageDriverLock(driver);
+ pool = virStoragePoolObjFindByName(&driver->pools, obj->pool);
+ storageDriverUnlock(driver);
+
+ if (!pool) {
+ virStorageReportError(VIR_ERR_NO_STORAGE_POOL,
+ _("no storage pool with matching uuid"));
+ goto out;
+ }
+
+ if (!virStoragePoolObjIsActive(pool)) {
+ virStorageReportError(VIR_ERR_OPERATION_INVALID,
+ _("storage pool is not active"));
+ goto out;
+ }
+
+ if ((backend = virStorageBackendForType(pool->def->type)) == NULL)
+ goto out;
+
+ vol = virStorageVolDefFindByName(pool, obj->name);
+
+ if (vol == NULL) {
+ virStorageReportError(VIR_ERR_NO_STORAGE_VOL,
+ _("no storage vol with matching name '%s'"),
+ obj->name);
+ goto out;
+ }
+
+ if (vol->building) {
+ virStorageReportError(VIR_ERR_OPERATION_INVALID,
+ _("volume '%s' is still being allocated."),
+ vol->name);
+ goto out;
+ }
+
+ if (capacity < vol->allocation) {
+ virStorageReportError(VIR_ERR_INVALID_ARG,
+ _("can't shrink capacity below "
+ "existing allocation"));
+ goto out;
+ }
+
+ if (capacity > vol->allocation + pool->def->available) {
+ virStorageReportError(VIR_ERR_INVALID_ARG,
+ _("Not enough space left on storage pool"));
+ goto out;
+ }
+
+ if (!backend->resizeVol) {
+ virStorageReportError(VIR_ERR_NO_SUPPORT,
+ _("storage pool does not support changing of "
+ "volume capacity"));
+ goto out;
+ }
+
+ if (backend->resizeVol(obj->conn, pool, vol, capacity, flags) < 0)
+ goto out;
+
+ vol->capacity = capacity;
+ ret = 0;
+
+out:
+ if (pool)
+ virStoragePoolObjUnlock(pool);
+ return ret;
+}
/* If the volume we're wiping is already a sparse file, we simply
* truncate and extend it to its original size, filling it with
@@ -2243,6 +2322,7 @@ static virStorageDriver storageDriver = {
.volGetInfo = storageVolumeGetInfo, /* 0.4.0 */
.volGetXMLDesc = storageVolumeGetXMLDesc, /* 0.4.0 */
.volGetPath = storageVolumeGetPath, /* 0.4.0 */
+ .volResize = storageVolumeResize, /* 0.9.10 */
.poolIsActive = storagePoolIsActive, /* 0.7.3 */
.poolIsPersistent = storagePoolIsPersistent, /* 0.7.3 */
diff --git a/src/util/storage_file.c b/src/util/storage_file.c
index ba9cfc5..8260adb 100644
--- a/src/util/storage_file.c
+++ b/src/util/storage_file.c
@@ -931,6 +931,22 @@ virStorageFileFreeMetadata(virStorageFileMetadata *meta)
VIR_FREE(meta);
}
+/**
+ * virStorageFileResize:
+ *
+ * Change the capacity of the raw storage file at 'path'.
+ */
+int
+virStorageFileResize(const char *path, unsigned long long capacity)
+{
+ if (truncate(path, capacity) < 0) {
+ virReportSystemError(errno, _("Failed to truncate file '%s'"), path);
+ return -1;
+ }
+
+ return 0;
+}
+
#ifdef __linux__
# ifndef NFS_SUPER_MAGIC
diff --git a/src/util/storage_file.h b/src/util/storage_file.h
index b8920d0..96afb12 100644
--- a/src/util/storage_file.h
+++ b/src/util/storage_file.h
@@ -72,6 +72,8 @@ int virStorageFileGetMetadataFromFD(const char *path,
void virStorageFileFreeMetadata(virStorageFileMetadata *meta);
+int virStorageFileResize(const char *path, unsigned long long capacity);
+
enum {
VIR_STORAGE_FILE_SHFS_NFS = (1 << 0),
VIR_STORAGE_FILE_SHFS_GFS2 = (1 << 1),
diff --git a/tools/virsh.c b/tools/virsh.c
index 74655c2..20d4bd0 100644
--- a/tools/virsh.c
+++ b/tools/virsh.c
@@ -11279,6 +11279,58 @@ cmdVolInfo(vshControl *ctl, const vshCmd *cmd)
return ret;
}
+/*
+ * "vol-resize" command
+ */
+static const vshCmdInfo info_vol_resize[] = {
+ {"help", N_("resize a vol")},
+ {"desc", N_("Resizes a storage vol.")},
+ {NULL, NULL}
+};
+
+static const vshCmdOptDef opts_vol_resize[] = {
+ {"vol", VSH_OT_DATA, VSH_OFLAG_REQ, N_("vol name, key or path")},
+ {"capacity", VSH_OT_DATA, VSH_OFLAG_REQ, N_("new capacity for the vol with optional k,M,G,T suffix")},
+ {"pool", VSH_OT_STRING, 0, N_("pool name or uuid")},
+ {NULL, 0, 0, NULL}
+};
+
+static bool
+cmdVolResize(vshControl *ctl, const vshCmd *cmd)
+{
+ virStorageVolPtr vol;
+ const char *capacityStr = NULL;
+ unsigned long long capacity = 0;
+ bool ret = true;
+
+ if (!vshConnectionUsability(ctl, ctl->conn))
+ return false;
+
+ if (!(vol = vshCommandOptVol(ctl, cmd, "vol", "pool", NULL)))
+ return false;
+
+ if (vshCommandOptString(cmd, "capacity", &capacityStr) <= 0)
+ goto cleanup;
+ if (cmdVolSize(capacityStr, &capacity) < 0) {
+ vshError(ctl, _("Malformed size %s"), capacityStr);
+ goto cleanup;
+ }
+
+ if (virStorageVolResize(vol, capacity, 0) == 0) {
+ vshPrint(ctl, "Size of volume '%s' successfully changed to %s\n",
+ virStorageVolGetName(vol), capacityStr);
+ ret = true;
+ } else {
+ vshError(ctl, "Failed to change size of volume '%s' to %s\n",
+ virStorageVolGetName(vol), capacityStr);
+ ret = false;
+ }
+
+cleanup:
+ virStorageVolFree(vol);
+ return ret;
+}
+
/*
* "vol-dumpxml" command
@@ -16141,6 +16193,7 @@ static const vshCmdDef storageVolCmds[] = {
{"vol-pool", cmdVolPool, opts_vol_pool, info_vol_pool, 0},
{"vol-upload", cmdVolUpload, opts_vol_upload, info_vol_upload, 0},
{"vol-wipe", cmdVolWipe, opts_vol_wipe, info_vol_wipe, 0},
+ {"vol-resize", cmdVolResize, opts_vol_resize, info_vol_resize, 0},
{NULL, NULL, NULL, NULL, 0}
};
--
1.7.7.5
12 years, 5 months
[libvirt] serial console/events example script
by Dave Allan
Hi all,
A while back I wrote the attached code to demonstrate how to use
events and serial console to create a serial console that stays up
even when the VM is down. Is it worth adding to the examples? It
might need some work, as I am not terribly strong with Python.
Dave
12 years, 5 months
[libvirt] [libvirt-TCK][PATCH] use 'raw' format as the format of backing file of qcow2 image
by Guannan Ren
If we don't explicitly specify the format of backing file,
it should use raw by default, if so, libvirt's security drivers
should *not* grant access to the last.img file & the guest
should not see the last.img data. That is the purpose of testing.
---
scripts/qemu/205-qcow2-double-backing-file.t | 1 -
1 files changed, 0 insertions(+), 1 deletions(-)
diff --git a/scripts/qemu/205-qcow2-double-backing-file.t b/scripts/qemu/205-qcow2-double-backing-file.t
index d3a5e33..ad54c7c 100644
--- a/scripts/qemu/205-qcow2-double-backing-file.t
+++ b/scripts/qemu/205-qcow2-double-backing-file.t
@@ -114,7 +114,6 @@ SKIP: {
my $volmainxml = $tck->generic_volume("tck-main", "qcow2", 1024*1024*50)
->backing_file($pathback)
- ->backing_format("qcow2")
->allocation(0)->as_xml;
--
1.7.7.5
12 years, 7 months
[libvirt] Memory leak on list_domains
by Carlos Rodrigues
Hi,
I have some problems on my application with memory leak when call
list_domains method.
I'm using libvirt 0.8.3 and Sys::Virt 0.2.4 Perl Module.
Does anyone have any idea what's the problem?
Regards,
--
Carlos Rodrigues <cmar(a)eurotux.com>
Eurotux Informática, S.A. [http://eurotux.com]
12 years, 7 months
[libvirt] help for libvirt0.9.8 compile
by hero
my redhat6.1 has a libvirt0.8.7, and I got a libvirt0.9.8.tar that I want to update the old one.
when I use
'./configure --prefix=/usr --libdir=/usr/lib64 --localstatedir=/var --sysconfdir=/etc'
it siad 'configure: error: You must install device-mapper-devel/libdevmapper >= 1.0.0 to compile libvirt'
please tell me how to do if you know.
thanks.
best wishes!
SunYongGang
12 years, 7 months
