transient information regarding a domain. This allows live localhost migration,
which is important for testing migration, and also allows migration when we
have a distributed store. The backend paths in the store now refer to the
frontend domain ID, not its UUID, and blktap has changed to match.
To support this split in the information, the cleanup procedure has been split
to match.
Change the save-restore interface between XendDomain, XendDomainInfo, and
XendCheckpoint, to remove some intermingling, in particular taking XendDomain
out of the loop for the restore procedure.
Improved the recovery procedure to avoid trying to destroy dom0 when recovering.
Added a lock around XendDomain.refresh and one around
XendDomainInfo.refreshShutdown, to improve the behaviour when recreating
domains at startup. There are still races here, so more thought needs to be
given to the locking.
Live reconfiguration of an existing domain is temporarily broken.
Signed-off-by: Ewan Mellor <ewan@xensource.com>
xs_write with O_CREAT|O_EXCL causes problems over daemon restarts, since
it's not idempotent.
It turns out noone really needs the flags word at all, so get rid of it.
It's now as if everyone specified "O_CREAT".
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
Mostly this makes the tap code work again with all of the changes that
have happened to the block drivers recently. We now use a shared page
per VBD (to the driver), and handle control information through the
store. The taplib interfaces have changed to be based around per-vbd
data structures that you can attach arbitrary handlers for.
There is also initial code for a user-level blockback driver, which
aims to get around the use of loopbacks for file-based vbds. Still
plenty of work to do here -- this is a working incremental checkin and
I'm away from this for the next four weeks.
Signed-off-by: Andrew Warfield <andrew.warfield@cl.cam.ac.uk>
This patch changes the blktap code mapping pages to user space to be
faster and to allow page lookups to foreign mapped pages through linux
to do direct io. An AIO test driver on this achieves comparable
performance to the in-kernel block-backend.
Signed-off-by: andrew.warfield@cl.cam.ac.uk
Parallax fixes/updates:
- all data access now through the async lookup code.
- added synchronous wrappers for tools to use.
- added end-to-end crc32 on all image blocks
- various other fixes/cleanups/test stubs.
Signed-off-by: andrew.warfield@cl.cam.ac.uk
Nothing but vnet uses libxutil -- move it there.
Makefile, xc.c, setup.py, configure, configure.in, Makefile.in:
This doesn't use libxutil.
Makefile, Makefile.vnet, Rules.mk:
Move libxutil into vnet since it's only used there.
Many files:
mvdir
Clean up vbd probing, and include hardware sector size in the probe
information. blkback ensures that all requests are aligned to
hardware sector size and returns error if this is not so.
In blkfront we now have a request_queue per vbd, with hardsect_size
set appropriately.
It is now once again possible to mount a CDROM in a domU.
Signed-off-by: Keir Fraser <keir@xensource.com>
- Finer-grained asynchronous dispatch in parallax daemon.
- Cleanups and cull of older code.
- Fixes to handle changes in block protocol.
Signed-off-by: andrew.warfield@cl.cam.ac.uk
[PATCH] Install libraries into libdir
Attached makes it so that libxc and libxutil get installed
into /usr/lib64 instead of /usr/lib on x86_64.
Signed-off-by: Jeremy Katz <katzj@redhat.com>
===== Config.mk 1.3 vs edited =====
I/O rings may now be dynamically sized: instead of declaring size
at struct definition time, declare it in FRONT/BACK_RING_INIT().
Signed-off-by: Keir Fraser <keir@xensource.com>
Clean up ctrl msg handling in Linux. Remove VBD_GROW/SHRINK -- a VBD
now maps onto a single complete major/minor that is specified at
VBD_CREATE time. Also improve blkdev request_queue unplugging in the
2.6 backend driver to promote better batching.
Signed-off-by: Keir Fraser <keir@xensource.com>
Initial checkin of blktap user-land tools. These are fairly experimental,
but a few people have asked to use them. This checkin also includes
Christian's gnbd client library code.
Signed-off-by: andrew.warfield@cl.cam.ac.uk
