Use G_GNUC_UNUSED from GLib instead of ATTRIBUTE_UNUSED.
Signed-off-by: NJán Tomko <jtomko@redhat.com>
Reviewed-by: NMichal Privoznik <mprivozn@redhat.com>

Turns out, block mirror is not the only job a disk can have. It
can also do commits of one layer into the other. Or possibly some
other tricks too. Problem is that while we set seclabels on given
layers of backing chain when the job is starting (via
qemuDomainStorageSourceAccessAllow()) we don't restore them when
job finishes. This leaves XATTRs set and corresponding images
unusable.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
ACKed-by: NPeter Krempa <pkrempa@redhat.com>

Most code paths prevent starting a blockjob if we already have one but
the job registering function does not do this check. While this isn't a
problem for regular cases we had a bad test case where we registered two
jobs for a single disk which leaked one of the jobs. Prevent this in the
registering function until we allow having multiple jobs per disk.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
ACKed-by: NEric Blake <eblake@redhat.com>
Reviewed-by: NMartin Kletzander <mkletzan@redhat.com>

If a block job reaches failed/cancelled state, or is completed
without pivot then we must remove security driver metadata
associated to the backing chain so that we don't leave any
metadata behind.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1741456Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
ACKed-by: NPeter Krempa <pkrempa@redhat.com>

When a block job is completed, the security image metadata are
moved to the new image. If this fails an warning is printed, but
the message contains only domain name and lacks image paths. Put
them both into the warning message.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
ACKed-by: NPeter Krempa <pkrempa@redhat.com>

Currently, there are only a few lines of code so a separate
function was not necessary, but this will change. So instead of
putting all the new code under 'case
QEMU_BLOCKJOB_TYPE_ACTIVE_COMMIT' create a separate function.
Just like every other case has one.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
ACKed-by: NPeter Krempa <pkrempa@redhat.com>

Implement job handling for the block copy job (drive/blockdev-mirror)
when using -blockdev. In contrast to the previously implemented
blockjobs the block copy job introduces new images to the running qemu
instance, thus requires a bit more handling.

When copying to new images the code now makes use of blockdev-create to
format the images explicitly rather than depending on automagic qemu
behaviour.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

QEMU finally exposes an interface which allows us to instruct it to
format or create arbitrary images. This is required for blockdev
integration of block copy and snapshots as we need to pre-format images
prior to use with blockdev-add.

This path introduces job handling and also helpers for formatting and
attaching a whole image described by a virStorageSource.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Rather than copying just the top level image, let's copy the full user
provided backing chain.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

The utility of the function is extremely limited as for block copy
we need to register the mirror chain earlier than when it's set with the
disk. This means that it would be open-coded in that case.

Avoid any weird usage and just open-code the only current usage, remove
the function, and reword the docs.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Introduce the handler for finalizing a block commit and active bloc
commit job which will allow to use it with blockdev.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Introduce the handler for finalizing a block pull job which will allow
to use it with blockdev.

This patch also contains some additional machinery which is required to
store all the relevant job data in the status XML which will also be
reused with other block job types.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

qemuBlockJobRewriteConfigDiskSource rewrites the disk source only
according to the 'target'. This means that if someone would change the
inactive config of the VM to refer to a different disk a block job would
rewrite it when finishing a job which modifies the disk source.

Make sure that this does not happen by verifying that the source of the
config disk is the same.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
ACKed-by: NEric Blake <eblake@redhat.com>

Since we copy everything from the original storage source including some
runtime data which are not relevant for the config we should clear them.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
ACKed-by: NEric Blake <eblake@redhat.com>

Both active block commit and block copy modify the disk source of the
active definition and thus also must modify the corresponding inactive
definition source so that the VM starts up later. This is currently
implemented in the legacy block job handler but the logic will be useful
also for the new handlers. Split it out which also simplifies it.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
ACKed-by: NEric Blake <eblake@redhat.com>

The <mirror> subelement is used in two ways: in a commit job to point to
existing storage, and in a block-copy job to point to additional
storage. We need a way to track only the distinct storage.

This patch introduces qemuBlockJobDiskRegisterMirror which registers the
mirror chain separately only for jobs which require it. This also comes
with remembering that in the status XML.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
ACKed-by: NEric Blake <eblake@redhat.com>

Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
ACKed-by: NEric Blake <eblake@redhat.com>

Commit c4123837 used a value from wrong enum when setting the disk's
mirrorState variable. This meant that a 'READY' job would show up as
'PIVOTING'.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
ACKed-by: NEric Blake <eblake@redhat.com>

When returning to asynchronous block job handling the flag which
determines the handling method should be reset prior to flushing
outstanding events. If there's an event to process the handler may
invoke the monitor and another event may be received. We'd not process
that one. Reset the flag earlier.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Set the correct job states after the operation is requested in qemu.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

When initiating a pivot or abort of a block job we need to track which
one was initiated. Currently it was done via data stashed in
virDomainDiskDef. Add possibility to track this also together with the
job itself.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

In cases when the disk frontend was unplugged while a blockjob was
running the blockjob inherits the backing chain. When the blockjob is
then terminated we need to unplug the chain as it will not be used any
more.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

When the guest unplugs the disk frontend libvirt is responsible for
deleting the backend. Since a blockjob may still have a reference to the
backing chain when it is running we'll have to store the metadata for
the unplugged disk for future reference.

This patch adds 'chain' and 'mirrorChain' fields to 'qemuBlockJobData'
to keep them around with the job along with status XML machinery and
tests. Later patches will then add code to change the ownership of the
chain when unplugging the disk backend.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Refresh the state of the jobs and process any events that might have
happened while libvirt was not running.

The job state processing requires some care to figure out if a job
needs to be bumped.

For any invalid job try doing our best to cancel it.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Add the infrastructure to handle block job events in the -blockdev era.

Some complexity is required as qemu does not bother to notify whether
the job was concluded successfully or failed. Thus it's necessary to
re-query the monitor.

To minimize the possibility of stuck jobs save the state into the XML
prior to handling everything so that the reconnect code can potentially
continue with the cleanup.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

This new state is entered when qemu finished the job but libvirt does
not know whether it was successful or not.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Now that the blockjob handling code deals with the status XML we don't
need to save it explicitly when starting blockjobs.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Now that block job data is stored in the status XML portion we need to
make sure that everything which changes the state also saves the status
XML. The job registering function is used while parsing the status XML
so in that case we need to skip the XML saving.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

When parsing the status XML we need to register all existing jobs.
Export the functions so that they are usable in other modules.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Later on we'll format these values into the status XML so the from/to
string functions will come handy. The implementation also notes that
these will be used in the status XML to avoid somebody changing the
values.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Add the job structure to the table when instantiating a new job and
remove it when it terminates/fails.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

The legacy job handler does not look at the old job state so we can
update it earlier.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

There's no need to do it if the job is not completed. The new helper
allows to do this with much less hassle in the correct place.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Rename and move qemuBlockJobTerminate to qemuBlockJobUnregister and
separate bits from qemuBlockJobDiskNew which register the job with the
disk. This creates an unified interface for other APIs to use.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Simplify error paths.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

With -blockdev it will be possible that a block job loses the disk that
was used to start it to a guest-initiated hot-unplug. Don't emit the
block job events in that case as we can't report the top level source or
disk target for an unplugged (and potentially replugged with different
source) disk.

Eventually when we add machinery for tracking jobs globally for a VM the
event will be reinstated via the domain job event.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

job->newstate is now used internally all the time so there's no need to
clear it as it already has correct value.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NCole Robinson <crobinso@redhat.com>
Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>

Since c2573527 a reference of 'cfg' would be leaked if the function
does not need to process anything. Fix it by using VIR_AUTOUNREF.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>