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Eric Blake 4e9953a426 snapshot: allow reuse of existing files in disk snapshot 
When disk snapshots were first implemented, libvirt blindly refused
to allow an external snapshot destination that already exists, since
qemu will blindly overwrite the contents of that file during the
snapshot_blkdev monitor command, and we don't like a default of
data loss by default.  But VDSM has a scenario where NFS permissions
are intentionally set so that the destination file can only be
created by the management machine, and not the machine where the
guest is running, so that libvirt will necessarily see the destination
file already existing; adding a flag will allow VDSM to force the file
reuse without libvirt complaining of possible data loss.

https://bugzilla.redhat.com/show_bug.cgi?id=767104

* include/libvirt/libvirt.h.in (virDomainSnapshotCreateFlags): Add
VIR_DOMAIN_SNAPSHOT_CREATE_REUSE_EXT.
* src/libvirt.c (virDomainSnapshotCreateXML): Document it.  Add
note about partial failure.
* tools/virsh.c (cmdSnapshotCreate, cmdSnapshotCreateAs): Add new
flag.
* tools/virsh.pod (snapshot-create, snapshot-create-as): Document
it.
* src/qemu/qemu_driver.c (qemuDomainSnapshotDiskPrepare)
(qemuDomainSnapshotCreateXML): Implement the new flag.
 		2012-01-10 11:53:23 -07:00
.gnulib@6b93d00f54 build: update to latest gnulib 2011-12-01 14:12:59 -07:00
daemon domiftune: clean up previous patches 2012-01-02 14:35:12 -07:00
docs Docs: Document Android application using libvirt 2012-01-10 09:47:47 +01:00
examples examples: Update event tests for shutdown event 2011-12-05 17:35:29 +01:00
gnulib build: update to latest gnulib 2011-12-01 14:12:59 -07:00
include snapshot: allow reuse of existing files in disk snapshot 2012-01-10 11:53:23 -07:00
m4 build: reduce warnings from older gcc 2011-12-05 10:14:55 -07:00
po Release of libvirt-0.9.9 2012-01-07 12:18:06 +08:00
python domiftune: Add API virDomain{S,G}etInterfaceParameters 2011-12-29 18:24:43 +08:00
src snapshot: allow reuse of existing files in disk snapshot 2012-01-10 11:53:23 -07:00
tests qemu: add new disk device='lun' for bus='virtio' & type='block' 2012-01-09 10:55:53 -05:00
tools snapshot: allow reuse of existing files in disk snapshot 2012-01-10 11:53:23 -07:00
.dir-locals.el maint: let emacs avoid tabs in rng files 2011-08-13 08:56:26 -06:00
.gitignore Define keepalive protocol 2011-11-24 11:44:08 +01:00
.gitmodules make .gnulib a submodule 2009-07-08 16:17:51 +02:00
.mailmap maint: use mailmap, not AUTHORS, for secondary addresses 2011-11-11 08:56:19 -07:00
AUTHORS Fix typos in messages. 2012-01-03 20:30:33 -07:00
COPYING.LIB remove all trailing blank lines 2009-07-16 15:06:42 +02:00
ChangeLog-old generate ChangeLog from git logs into distribution tarball 2009-07-08 16:17:51 +02:00
HACKING Document STREQ_NULLABLE and STRNEQ_NULLABLE 2011-10-06 16:50:38 +02:00
Makefile.am maint: add missing copyright notices 2011-07-28 15:01:17 -06:00
Makefile.nonreentrant Ban use of all inet_* functions 2010-10-22 11:59:23 +01:00
README Correct typos in the documentation (Atsushi SAKAI) 2008-01-24 10:15:13 +00:00
README-hacking maint: relax git minimum version 2010-02-24 14:29:27 -05:00
TODO Update todo list file to point at bugzilla/website 2010-10-13 16:45:26 +01:00
autobuild.sh Disable python explicitly in mingw32 autobuild 2011-12-19 13:44:18 +00:00
autogen.sh build: allow for local gnulib diffs 2011-11-09 09:03:33 -07:00
bootstrap build: fix compilation on mingw64 2011-08-19 07:20:10 -06:00
bootstrap.conf maint: allow bootstrap in a sandbox 2011-12-08 14:37:15 -07:00
cfg.mk build: update to latest gnulib 2011-12-01 14:12:59 -07:00
configure.ac Release of libvirt-0.9.9 2012-01-07 12:18:06 +08:00
libvirt.pc.in * libvirt.pc.in: applied patch from Daniel Berrange to fix --cflags 2006-03-24 13:18:12 +00:00
libvirt.spec.in Release of libvirt-0.9.9 2012-01-07 12:18:06 +08:00
mingw32-libvirt.spec.in spec: make it easier to autoreconf when building rpm 2011-12-08 09:49:50 -07:00

README 

         LibVirt : simple API for virtualization

  Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.

Daniel Veillard <veillard@redhat.com>