Parse network interfaces info from prlctl output.

Parallels Cloud Server uses virtual networks model for
network configuration: You can add network adapter to
VM and connect it to some predefined virtual network.

Fill type, mac, network name and linkstate fields of
virDomainNetDef structure.
Signed-off-by: NDmitry Guryanov <dguryanov@parallels.com>

When the disk snapshot part of an external system checkpoint fails the
memory image is retained. This patch adds code to remove the image in
such case.

In case the snapshot code isn't able to restart CPUs after an external
checkpoint we would leak a copy of the domains XML definition. This
patch fixes the cleanup path.

False positive, but it breaks the build with gcc-4.6.3.

qemu/qemu_migration.c:2931:37: error: 'offline' may be used
uninitialized in this function [-Werror=uninitialized]
qemu/qemu_migration.c:2887:10: note: 'offline' was declared here

This patch changes how parameters are passed to dnsmasq.  Instead of
being on the command line, the parameters are put into a file (one
parameter per line) and a commandline --conf-file= specifies the
location of the file.  The file is located in the same directory as
the leases file.

Putting the dnsmasq parameters into a configuration file
allows them to be examined and more easily understood than
examining the command lines displayed by "ps ax".  This is
especially true when a number of networks have been started.

When the use of dnsmasq was originally done, the required command line
was simple, but it has gotten more complicated over time and will
likely become even more complicated in the future.

Note: The test conf files have all been renamed .conf instead of
.argv, and tests/networkxml2xmlargvdata was moved to
tests/networkxml2xmlconfdata.

The DHCPv6 support includes IPV6 dhcp-range and dhcp-host for one
IPv6 subnetwork on one interface.  This support will only work
if dnsmasq version >= 2.64; otherwise an error occurs if
dhcp-range or dhcp-host is specified for an IPv6 address.

Essentially, this change provides the same DHCP support for IPv6
that has been available for IPv4.

With dnsmasq >= 2.64, support for the RA service is also now provided
by dnsmasq (radvd is no longer used/started). (Although at least one
version of dnsmasq prior to 2.64 "supported" IPv6 Router
Advertisement, there were bugs (fixed in 2.64) that rendered it
unusable.)

Documentation and the network schema has been updated
to reflect the new support.

virNetworkDefUpdateForward requires separate functions to parse and
clear a virNetworkForwardDef by itself, but they were previously just
inlined in the virNetworkDef parse and free functions. This patch
makes them into separate functions.

The attributes of a <network> element's <forward> element were
previously stored directly in the virNetworkDef object, but
virNetworkUpdateForward() needs to operate on a <forward> in
isolation, so this patchs pulls out all those attributes into a
separate virNetworkForwardDef struct (and shortens their names
appropriately). This new object is contained in the virNetworkDef, not
pointed to by it, so there is no extra memory management.

This patch makes no functional changes, it only changes, e.g.,
"nForwardIfs" to "forward.nifs".

The other clear functions in network_conf.c that clear out arrays of
sub-objects do so by using the n[itemname]s value as a counter going
down to 0. Make this one consistent. There's no functional value, just
makes the style more consistent with the rest of the file.

This makes some function names and arg lists for consistent with other
parse functions in network_conf.c. While modifying
virNetworkIPParseXML(), also change its "error" label to "cleanup",
since the code at that label is executed on success as well as
failure.

These three functions are very similar - none allow a MODIFY
operation; you can only add or delete.

The biggest difference between them (other than the data itself) is in
the criteria for determining a match, and whether or not multiple
matches are possible:

1) for HOST records, it's considered a match if the IP address or any
of the hostnames of an existing record matches.

2) for SRV records, it's a match if all of
domain+service+protocol+target *which have been specified* are
matched.

3) for TXT records, there is only a single field to match - name
(value can be the same for multiple records, and isn't considered a
search term), so by definition there can be no ambiguous matches.

In all three cases, if any matches are found, ADD will fail; if
multiple matches are found, it means the search term was ambiguous,
and a DELETE will fail.

The upper level code in bridge_driver.c is already implemented for
these functions - appropriate conf files will be re-written, and
dnsmasq will be SIGHUPed or restarted as appropriate.

Since there is only a single virNetworkDNSDef for any virNetworkDef,
and it's trivial to determine whether or not it contains any real
data, it's much simpler (and fits more uniformly with the parse
function calling sequence of the parsers for many other objects that
are subordinates of virNetworkDef) if virNetworkDef *contains* an
virNetworkDNSDef rather than pointing to one.

Since it is now just a part of another object rather than its own
object, it no longer makes sense to have a *Free() function, so that
is changed to a *Clear() function.

More importantly though, ParseXML and Clear functions are needed for
the individual items contained in a virNetworkDNSDef (srv, txt, and
host records), but none of them have a *Clear(), and only two of the
three had *ParseXML() functions (both of which used a non-uniform
arglist). Those problems are cleared up by this patch - it splits the
higher-level Clear function into separate functions for each of the
three, creates a parse for txt records, and cleans up the srv and host
parsers, so we now have all the utility functions necessary to
implement virNetworkDefUpdateDNS(Host|Srv|Txt).

This shortens the name of the structs for srv and txt, and their
instances in virNetworkDNSDef, to be more compact and uniform with the
naming of the dns host array. It also changes the type of ntxts, etc
from unsigned int to size_t, so that they can be used directly as args
to VIR_*_ELEMENT.

The already-written backend functions for virNetworkUpdate that add
and delete items into lists within the a network were already debugged
to work properly, but future such functions will use
VIR_(INSERT|DELETE)_ELEMENT instead, so these are changed for
uniformity.

I noticed when writing the backend functions for virNetworkUpdate that
I was repeating the same sequence of memmove, VIR_REALLOC, nXXX-- (and
messed up the args to memmove at least once), and had seen the same
sequence in a lot of other places, so I decided to write a few
utility functions/macros - see the .h file for full documentation.

The intent is to reduce the number of lines of code, but more
importantly to eliminate the need to check the element size and
element count arithmetic every time we need to do this (I *always*
make at least one mistake.)

VIR_INSERT_ELEMENT: insert one element at an arbitrary index within an
  array of objects. The size of each object is determined
  automatically by the macro using sizeof(*array). The new element's
  contents are copied into the inserted space, then the original copy
  of contents are 0'ed out (if everything else was
  successful). Compile-time assignment and size compatibility between
  the array and the new element is guaranteed (see explanation below
  [*])

VIR_INSERT_ELEMENT_COPY: identical to VIR_INSERT_ELEMENT, except that
  the original contents of newelem are not cleared to 0 (i.e. a copy
  is made).

VIR_APPEND_ELEMENT: This is just a special case of VIR_INSERT_ELEMENT
  that "inserts" one past the current last element.

VIR_APPEND_ELEMENT_COPY: identical to VIR_APPEND_ELEMENT, except that
  the original contents of newelem are not cleared to 0 (i.e. a copy
  is made).

VIR_DELETE_ELEMENT: delete one element at an arbitrary index within an
  array of objects. It's assumed that the element being deleted is
  already saved elsewhere (or cleared, if that's what is appropriate).

All five of these macros have an _INPLACE variant, which skips the
memory re-allocation of the array, assuming that the caller has
already done it (when inserting) or will do it later (when deleting).

Note that VIR_DELETE_ELEMENT* can return a failure, but only if an
invalid index is given (index + amount to delete is > current array
size), so in most cases you can safely ignore the return (that's why
the helper function virDeleteElementsN isn't declared with
ATTRIBUTE_RETURN_CHECK). A warning is logged if this ever happens,
since it is surely a coding error.

[*] One initial problem with the INSERT and APPEND macros was that,
due to both the array pointer and newelem pointer being cast to void*
when passing to virInsertElementsN(), any chance of type-checking was
lost. If we were going to move in newelem with a memmove anyway, we
would be no worse off for this. However, most current open-coded
insert/append operations use direct struct assignment to move the new
element into place (or just populate the new element directly) - thus
use of the new macros would open a possibility for new usage errors
that didn't exist before (e.g. accidentally sending &newelemptr rather
than newelemptr - I actually did this quite a lot in my test
conversions of existing code).

But thanks to Eric Blake's clever thinking, I was able to modify the
INSERT and APPEND macros so that they *do* check for both assignment
and size compatibility of *ptr (an element in the array) and newelem
(the element being copied into the new position of the array). This is
done via clever use of the C89-guaranteed fact that the sizeof()
operator must have *no* side effects (so an assignment inside sizeof()
is checked for validity, but not actually evaluated), and the fact
that virInsertElementsN has a "# of new elements" argument that we
want to always be 1.

When restarting CPUs after an external snapshot, the restarting function
was called without the appropriate async job type. This caused that a
new sync job wasn't created and allowed races in the monitor.

If some hard disk is not found in new domain configuration, it
should be removed.
Signed-off-by: NDmitry Guryanov <dguryanov@parallels.com>

New VM will have default values for all parameters, like
cpu number, we have to change its configuration as provided
by xml definition, given to parallelsDomainDefineXML.
Signed-off-by: NDmitry Guryanov <dguryanov@parallels.com>

Implement creation of new disks - if a new disk found
in configuration, find a volume by disk path and
actually create a disk image by issuing prlctl command.
If it's successfully finished - remove the file with volume
definition.
Signed-off-by: NDmitry Guryanov <dguryanov@parallels.com>

Add function for convertion bus from libvirt's numeric constant
to a name, used in a parallels command-line tools.
Signed-off-by: NDmitry Guryanov <dguryanov@parallels.com>

Move part, which deletes existing volume, to a new function
parallelsStorageVolumeDefRemove so that we can use it later
in parallels_driver.c
Signed-off-by: NDmitry Guryanov <dguryanov@parallels.com>

Read disk images size from xml description and fill
virStorageVolDef.capacity and allocation (let's consider
that allocation is the same as capacity, calculating real
allcoation will be implemented later).
Signed-off-by: NDmitry Guryanov <dguryanov@parallels.com>

Disk images in Parallels Cloud Server stored in directories. Each
one has files with data and xml description of an image stored in
file DiskDescriptior.xml.

Since we have to support 'detached' images, which are not used by
any VM, the better way to collect info about volumes is searching for
directories with a file DiskDescriptior.xml in each VM directory.
Signed-off-by: NDmitry Guryanov <dguryanov@parallels.com>

We always have to close opened dir and free 'path'.
Signed-off-by: NDmitry Guryanov <dguryanov@parallels.com>

There are no storage pools in Parallels Cloud Server -
All VM data stored in a single directory: config, snapshots,
memory dump together with disk images.

Let's look through list of VMs and create a storage pool for
each directory, containing VMs.

So if you have 3 vms: /var/parallels/vm-1.pvm,
/var/parallels/vm-2.pvm and /root/test.pvm - 2 storage pools
appear: -var-parallels and -root. xml descriptions of the pools
will be saved in /etc/libvirt/parallels-storage, so UUIDs will
not change netween connections to libvirt.
Signed-off-by: NDmitry Guryanov <dguryanov@parallels.com>

We don't support unprivileged users anymore, so remove code, which
selects configuration directory depending on user.
Signed-off-by: NDmitry Guryanov <dguryanov@parallels.com>

Move code for loading inforation about pools to a separate
function - parallelsLoadPools.
Signed-off-by: NDmitry Guryanov <dguryanov@parallels.com>

Allow changing some parameters of the hard disks: bus,
image and drive address.

Creating new disk devices and removing existing ones
require changes in the storage driver, so it will be
implemented later.
Signed-off-by: NDmitry Guryanov <dguryanov@parallels.com>

Parse information about hard disks and fill disks array
in virDomainDef structure.
Signed-off-by: NDmitry Guryanov <dguryanov@parallels.com>

Offline migration transfers inactive definition of a domain (which may
or may not be active). After successful completion, the domain remains
in its current state on source host and is defined but inactive on
destination host. It's a bit more clever than virDomainGetXMLDesc() on
source host followed by virDomainDefineXML() on destination host, as
offline migration will run pre-migration hook to update the domain XML
on destination host. Currently, copying non-shared storage is not
supported during offline migration.

Offline migration can be requested with a new migration flag called
VIR_MIGRATE_OFFLINE (which has to be combined with
VIR_MIGRATE_PERSIST_DEST flag).

This fixes a problem that showed up during testing of:

  https://bugzilla.redhat.com/show_bug.cgi?id=881480

Due to a logic error in the function that gets the name of the bridge
an interface connects to, any time a bridge was specified directly
(type='bridge') rather than indirectly (type='network'), An error
would be logged (although the operation would then complete
successfully):

   Network type 6 is not supported

The final virReportError() in the function
qemuDomainNetGetBridgeName() was apparently avoided in the past with a
"goto cleanup" at the end of each case, but the case of bridge somehow
no longer has that final goto cleanup.

The proper solution is anyway to not rely on goto's, but put the error
log inside an else {} clause, so that it's executed only if the type
is neither bridge nor network (in reality, this function should only
ever be called for those two types, that's why this is an internal
error).

While making this change, the error message was also tuned to be more
correct (since it's not really the type of the network, but the type
of the interface, and it *is* otherwise supported, it's just that the
interface type in question doesn't *have* a bridge device associated
with it, or at least we don't know how to get it).

If a network interface model is not specified, libvirt will run
into an unchecked NULL pointer coredump. On the other hand if
the empty model is ignored, a PCI bus address would be generated,
which is not supported by S390.
Since the only valid network type model for S390 is virtio,
we use this as the default value, which is the same for QEMU.
Signed-off-by: NViktor Mihajlovski <mihajlov@linux.vnet.ibm.com>

This reverts commit 51144313
which was pushed accidentally.

Things are supposed to look like:

<machine canonical='pc-0.12'>pc</machine>

But are currently swapped. This can cause many VMs to revert to having
machine type='pc' which will affect save/restore across qemu upgrades.

The termios struct exported by the termios.h header is used as an
argument for vshMakeStdinRaw(). The header isn't used anywhere in
tools/virsh-domain.c.

This patch adds the header to the header declaring vshMakeStdinRaw() and
removes other places in virsh.

Add --prealloc-metadata flag to these commands:
vol-clone
vol-create
vol-create-as
vol-create-from

Add VIR_STORAGE_VOL_CREATE_PREALLOC_METADATA flag to virStorageVolCreateXML
and virStorageVolCreateXMLFrom. This flag requests metadata
preallocation when creating/cloning qcow2 images, resulting in creating
a sparse file with qcow2 metadata. It has only slightly larger disk usage
compared to new image with no allocation, but offers higher performance.

QEMU supports setting vendor and product strings for disk since
1.2.0 (only scsi-disk, scsi-hd, scsi-cd support it), this patch
exposes it with new XML elements <vendor> and <product> of disk
device.