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Jeff Cody fa40e65622 block: add QAPI command to allow live backing file change 
This allows a user to make a live change to the backing file recorded in
an open image.

The image file to modify can be specified 2 ways:

1) image filename
2) image node-name

Note: this does not cause the backing file itself to be reopened; it
merely changes the backing filename in the image file structure, and
in internal BDS structures.

It is the responsibility of the user to pass a filename string that
can be resolved when the image chain is reopened, and the filename
string is not validated.

A good analogy for this command is that it is a live version of
'qemu-img rebase -u', with respect to changing the backing file string.

[Jeff is offline so I respun this patch in his absence.  Dropped image
filename since using node-name is preferred and this is a new command.
No need to introduce the limitations of finding images by filename.
--Stefan]

Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Jeff Cody <jcody@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-07-01 10:46:38 +02:00
audio
backends rng-random: NULL check not needed before g_free() 2014-06-24 20:01:24 +04:00
block block/cow: Avoid use of uninitialized cow_bs in error path 2014-07-01 10:15:34 +02:00
bsd-user
default-configs
disas disas/libvixl: Fix wrong format strings 2014-06-29 22:04:28 +01:00
docs qapi: Change back sector-count to sectors-count in quorum QAPI events. 2014-07-01 10:15:34 +02:00
dtc@bc895d6d09
fpu fpu: softfloat: drop INLINE macro 2014-06-23 11:00:12 -04:00
fsdev
gdb-xml
hw virtio-blk: remove need for explicit x-data-plane=on option 2014-07-01 09:15:02 +02:00
include qemu-img create: add 'nocow' option 2014-07-01 10:15:12 +02:00
libcacard vscclient: Add required headers to fix build on FreeBSD 2014-06-24 20:01:24 +04:00
libdecnumber
linux-headers
linux-user Merge remote-tracking branch 'remotes/riku/linux-user-for-upstream' into staging 2014-06-29 16:44:13 +01:00
net net: move queue number into NICPeers 2014-06-27 11:19:31 +02:00
pc-bios pc-bios/s390-ccw: update binary 2014-06-27 12:11:53 +02:00
pixman@97336fad32
po
qapi block: add QAPI command to allow live backing file change 2014-07-01 10:46:38 +02:00
qga
qobject json-lexer: fix escaped backslash in single-quoted string 2014-06-23 11:01:24 -04:00
qom qom: add object_property_add_alias() 2014-07-01 09:15:02 +02:00
roms
scripts qapi script: clean up in scripts 2014-06-27 09:27:56 -04:00
slirp Increase maximum number of session of the internal TFTP server. 2014-06-24 20:01:24 +04:00
stubs Merge remote-tracking branch 'remotes/qmp-unstable/queue/qmp' into staging 2014-06-24 13:06:13 +01:00
sysconfigs/target
target-alpha
target-arm Fix new typos (found by codespell) 2014-06-24 20:01:24 +04:00
target-cris
target-i386 target-i386: Broadwell CPU model 2014-06-25 23:54:57 +02:00
target-lm32 vl: allow other threads to do qemu_system_vmstop_request 2014-06-23 16:36:13 +08:00
target-m68k
target-microblaze
target-mips
target-moxie
target-openrisc openrisc: fix comment 2014-06-29 18:59:06 +03:00
target-ppc target-ppc: enable virtio endian ambivalent support 2014-06-29 19:39:43 +03:00
target-s390x target-s390x: Remove unused ld_code6() function 2014-06-24 20:01:24 +04:00
target-sh4
target-sparc
target-unicore32 target-unicore: Remove unused functions 2014-06-24 20:01:24 +04:00
target-xtensa
tcg tcg/ppc: Fix support for 64-bit PPC MacOSX hosts 2014-06-29 11:38:50 +01:00
tests block: make 'top' argument to block-commit optional 2014-07-01 10:15:33 +02:00
trace
ui ui/cocoa: Honour -show-cursor command line option 2014-06-29 22:00:33 +01:00
util qemu_opts_append: Play nicely with QemuOptsList's head 2014-06-26 15:53:52 +02:00
.exrc
.gitignore qapi: ignore generated event files 2014-06-27 09:27:55 -04:00
.gitmodules
.mailmap
.travis.yml
aio-posix.c
aio-win32.c
arch_init.c
async.c
balloon.c qapi event: convert BALLOON_CHANGE 2014-06-23 11:12:28 -04:00
block-migration.c
block.c block: simplify bdrv_find_base() and bdrv_find_overlay() 2014-07-01 10:15:34 +02:00
blockdev-nbd.c nbd: Shutdown socket before closing. 2014-06-30 12:50:12 +02:00
blockdev.c block: add QAPI command to allow live backing file change 2014-07-01 10:46:38 +02:00
blockjob.c blockjob: Fix recent BLOCK_JOB_ERROR regression 2014-06-27 20:00:00 +02:00
bt-host.c
bt-vhci.c
Changelog
CODING_STYLE
configure configure: Enable out-of-tree iotests 2014-06-27 20:00:00 +02:00
COPYING
COPYING.LIB
coroutine-gthread.c
coroutine-sigaltstack.c
coroutine-ucontext.c
coroutine-win32.c coroutine-win32.c: Add noinline attribute to work around gcc bug 2014-06-26 14:08:14 +01:00
cpu-exec.c
cpus.c qapi event: convert STOP 2014-06-23 11:01:25 -04:00
cputlb.c
device-hotplug.c
device_tree.c
disas.c
dma-helpers.c
dump.c
exec.c exec: introduce target_words_bigendian() helper 2014-06-29 19:39:42 +03:00
gdbstub.c
HACKING
hmp-commands.hx
hmp.c block: Add replaces argument to drive-mirror 2014-06-27 20:00:00 +02:00
hmp.h
iohandler.c
ioport.c
iothread.c
kvm-all.c
kvm-stub.c
LICENSE
main-loop.c
MAINTAINERS
Makefile qapi: move event defines 2014-06-27 09:27:55 -04:00
Makefile.objs qapi script: add event support 2014-06-23 11:01:25 -04:00
Makefile.target build-sys: introduce install-prog macro to install&strip binaries and use it 2014-06-24 20:01:24 +04:00
memory.c
memory_mapping.c
migration-exec.c
migration-fd.c
migration-rdma.c rdma: bug fixes 2014-06-23 19:09:50 +02:00
migration-tcp.c
migration-unix.c
migration.c
module-common.c
monitor.c serial: poll the serial console with G_IO_HUP 2014-06-30 15:04:34 +02:00
nbd.c nbd: Handle NBD_OPT_LIST option. 2014-06-30 12:50:17 +02:00
numa.c numa: Reject configuration if not all node IDs are present 2014-06-29 18:59:42 +03:00
os-posix.c
os-win32.c
page_cache.c
qapi-schema.json mc146818rtc: add rtc-reset-reinjection QMP command 2014-06-29 18:59:35 +03:00
qdev-monitor.c
qdict-test-data.txt
qemu-bridge-helper.c qemu-bridge-helper: Fix fd leak in main() 2014-06-27 10:39:10 +02:00
qemu-char.c char: report frontend open/closed state in 'query-chardev' 2014-06-27 09:34:00 -04:00
qemu-coroutine-io.c
qemu-coroutine-lock.c
qemu-coroutine-sleep.c
qemu-coroutine.c
qemu-doc.texi qemu-img create: add 'nocow' option 2014-07-01 10:15:12 +02:00
qemu-file.c
qemu-img-cmds.hx
qemu-img.c
qemu-img.texi qemu-img create: add 'nocow' option 2014-07-01 10:15:12 +02:00
qemu-io-cmds.c
qemu-io.c
qemu-log.c
qemu-nbd.c nbd: Shutdown socket before closing. 2014-06-30 12:50:12 +02:00
qemu-nbd.texi
qemu-options-wrapper.h
qemu-options.h
qemu-options.hx net: L2TPv3 transport 2014-06-27 10:39:10 +02:00
qemu-seccomp.c
qemu-tech.texi
qemu-timer.c
qemu.nsi
qemu.sasl
qmp-commands.hx block: add QAPI command to allow live backing file change 2014-07-01 10:46:38 +02:00
qmp.c
qtest.c
README
rules.mak build-sys: introduce install-prog macro to install&strip binaries and use it 2014-06-24 20:01:24 +04:00
savevm.c savevm: check vmsd for migratability status 2014-06-25 23:54:57 +02:00
softmmu_template.h
spice-qemu-char.c qemu-char: introduce qemu_chr_alloc 2014-06-23 11:12:28 -04:00
tcg-runtime.c
tci.c
thread-pool.c
thunk.c
tpm.c
trace-events spapr_pci: Use XICS interrupt allocator and do not cache interrupts in PHB 2014-06-27 13:48:27 +02:00
translate-all.c Fix new typos (found by codespell) 2014-06-24 20:01:24 +04:00
translate-all.h
user-exec.c
VERSION
version.rc
vl.c numa: Keep track of NUMA nodes present on the command-line 2014-06-29 18:59:41 +03:00
vmstate.c vmstate: Add preallocation for migrating arrays (VMS_ALLOC flag) 2014-06-27 13:48:27 +02:00
xbzrle.c
xen-common-stub.c
xen-common.c
xen-hvm-stub.c xen-hvm: Fix xen_hvm_init() to adjust pc memory layout 2014-06-23 17:50:04 +03:00
xen-hvm.c xen-hvm: Handle machine opt max-ram-below-4g 2014-06-23 18:02:55 +03:00
xen-mapcache.c

README 

Read the documentation in qemu-doc.html or on http://wiki.qemu-project.org

- QEMU team