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  1. 24 3月, 2012 8 次提交
    • E
      snapshot: add support for qemu transaction command · 64d5e815
      由 Eric Blake 提交于 
      QEmu 1.1 is adding a 'transaction' command to the JSON monitor.
Each element of a transaction corresponds to a top-level command,
with the additional guarantee that the transaction flushes all
pending I/O, then guarantees that all actions will be successful
as a group or that failure will roll back the state to what it
was before the monitor command.  The difference between a
top-level command:

{ "execute": "blockdev-snapshot-sync", "arguments":
  { "device": "virtio0", ... } }

and a transaction:

{ "execute": "transaction", "arguments":
  { "actions": [
    { "type": "blockdev-snapshot-sync", "data":
      { "device": "virtio0", ... } } ] } }

is just a couple of changed key names and nesting the shorter
command inside a JSON array to the longer command.  This patch
just adds the framework; the next patch will actually use a
transaction.

* src/qemu/qemu_monitor_json.c (qemuMonitorJSONMakeCommand): Move
guts...
(qemuMonitorJSONMakeCommandRaw): ...into new helper.  Add support
for array element.
(qemuMonitorJSONTransaction): New command.
(qemuMonitorJSONDiskSnapshot): Support use in a transaction.
* src/qemu/qemu_monitor_json.h (qemuMonitorJSONDiskSnapshot): Add
argument.
(qemuMonitorJSONTransaction): New declaration.
* src/qemu/qemu_monitor.h (qemuMonitorTransaction): Likewise.
(qemuMonitorDiskSnapshot): Add argument.
* src/qemu/qemu_monitor.c (qemuMonitorTransaction): New wrapper.
(qemuMonitorDiskSnapshot): Pass argument on.
* src/qemu/qemu_driver.c
(qemuDomainSnapshotCreateSingleDiskActive): Update caller.
      64d5e815
    • E
      snapshot: rudimentary qemu support for atomic disk snapshot · 4c4cc1b9
      由 Eric Blake 提交于 
      Taking an external snapshot of just one disk is atomic, without having
to pause and resume the VM.  This also paves the way for later patches
to interact with the new qemu 'transaction' monitor command.

The various scenarios when requesting atomic are:
online, 1 disk, old qemu - safe, allowed by this patch
online, more than 1 disk, old qemu - failure, this patch
offline snapshot - safe, once a future patch implements offline disk snapshot
online, 1 or more disks, new qemu - safe, once future patch uses transaction

Taking an online system checkpoint snapshot is atomic, since it is
done via a single 'savevm' monitor command.  Taking an offline system
checkpoint snapshot is atomic, thanks to the previous patch.

* src/qemu/qemu_driver.c (qemuDomainSnapshotCreateXML): Support
new flag for single-disk setups.
(qemuDomainSnapshotDiskPrepare): Check for atomic here.
(qemuDomainSnapshotCreateDiskActive): Skip pausing the VM when
atomic supported.
(qemuDomainSnapshotIsAllowed): Use bool instead of int.
      4c4cc1b9
    • E
      snapshot: make offline qemu snapshots atomic · 922d498e
      由 Eric Blake 提交于 
      Offline internal snapshots can be rolled back with just a little
bit of refactoring, meaning that we are now automatically atomic.

* src/qemu/qemu_domain.c (qemuDomainSnapshotForEachQcow2): Move
guts...
(qemuDomainSnapshotForEachQcow2Raw): ...to new helper, to allow
rollbacks.
      922d498e
    • E
      snapshot: add atomic create flag · 4d5533ca
      由 Eric Blake 提交于 
      Right now, it is appallingly easy to cause qemu disk snapshots
to alter a domain then fail; for example, by requesting a two-disk
snapshot where the second disk name resides on read-only storage.
In this failure scenario, libvirt reports failure, but modifies
the live domain XML in-place to record that the first disk snapshot
was taken; and places a difficult burden on the management app
to grab the XML and reparse it to see which disks, if any, were
altered by the partial snapshot.

This patch adds a new flag where implementations can request that
the hypervisor make snapshots atomically; either no changes to
XML occur, or all disks were altered as a group.  If you request
the flag, you either get outright failure up front, or you take
advantage of hypervisor abilities to make an atomic snapshot. Of
course, drivers should prefer the atomic means even without the
flag explicitly requested.

There's no way to make snapshots 100% bulletproof - even if the
hypervisor does it perfectly atomic, we could run out of memory
during the followup tasks of updating our in-memory XML, and report
a failure.  However, these sorts of catastrophic failures are rare
and unlikely, and it is still nicer to know that either all
snapshots happened or none of them, as that is an easier state to
recover from.

* include/libvirt/libvirt.h.in
(VIR_DOMAIN_SNAPSHOT_CREATE_ATOMIC): New flag.
* src/libvirt.c (virDomainSnapshotCreateXML): Document it.
* tools/virsh.c (cmdSnapshotCreate, cmdSnapshotCreateAs): Expose it.
* tools/virsh.pod (snapshot-create, snapshot-create-as): Document
it.
      4d5533ca
    • E
      snapshot: add qemu capability for 'transaction' command · 311357d9
      由 Eric Blake 提交于 
      We need a capability bit to gracefully error out if some of the
additions in future patches can't be implemented by the running qemu.

* src/qemu/qemu_capabilities.h (QEMU_CAPS_TRANSACTION): New cap.
* src/qemu/qemu_capabilities.c (qemuCaps): Name it.
* src/qemu/qemu_monitor_json.c (qemuMonitorJSONCheckCommands): Set
it.
      311357d9
    • E
      build: drop obsolete qparams test · 98ada9ab
      由 Eric Blake 提交于 
      Otherwise, 'make check' breaks since commit bc1ff160 deleted
qparams.h.  A later patch will ensure that viruri takes over
what qparams used to do.

* tests/qparamtest.c (mymain): Delete, now that we have viruri.
* tests/Makefile.am (check_PROGRAMS, TESTS, qparamtest_SOURCES):
Delete old test.
* .gitignore: Add recent test additions.
      98ada9ab
    • E
      build: fix incorrect enum declaration · 9b6860f5
      由 Eric Blake 提交于 
      Recent changes have caused build failures on systems where pdwtags works:
commit a26a1969 mistakenly exported a public variable
commits a26a1969, 57ddcc23, 487c0633 all had copy-paste bugs in
hand-updating the golden API rather than rerunning pdwtags

* include/libvirt/libvirt.h.in (virDomainEventTrayChangeReason):
Make this a typedef, not external storage.
* src/remote_protocol-structs (remote_procedure): Fix spelling.
      9b6860f5
    • L
      Add qemu support for ppc64 on FC16 or above for rpm packaging · 81203257
      由 Li Zhang 提交于 
      On Fedora16 or above, qemu is supported now. So it is added
in rpm packaging.
Signed-off-by: NLi Zhang <zhlcindy@linux.vnet.ibm.com>
      81203257
  3. 23 3月, 2012 30 次提交
  5. 22 3月, 2012 2 次提交