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40055951a7
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Max Reitz 40055951a7 qemu-img: Allow source cache mode specification 
Many qemu-img subcommands only read the source file(s) once. For these
use cases, a full write-back cache is unnecessary and mainly clutters
host cache memory. Though this is generally no concern as cache memory
is freely available and can be scaled by the host OS, it may become a
concern with thin provisioning.

For these cases, it makes sense to allow users to freely specify the
source cache mode (e.g. use no cache at all).

This commit adds a new switch (-T) for the qemu-img subcommands check,
compare, convert and rebase to specify the cache to be used for source
images (the backing file in case of rebase).

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-08-22 14:54:44 +02:00
audio audio: Drop superfluous conditionals around g_free() 2014-06-13 12:34:54 +02:00
backends SCSI changes that enable sending vendor-specific commands via virtio-scsi. 2014-08-19 13:00:57 +01:00
block vmdk: Use bdrv_nb_sectors() where sectors, not bytes are wanted 2014-08-22 11:10:12 +02:00
bsd-user bsd-user: Fix syscall format, add strace support for more syscalls 2014-06-11 00:25:06 +01:00
default-configs pc: implement pc-dimm device abstraction 2014-06-19 16:41:47 +03:00
disas disas/libvixl: prepend the include path of libvixl header files 2014-07-08 12:45:57 +01:00
docs SCSI changes that enable sending vendor-specific commands via virtio-scsi. 2014-08-19 13:00:57 +01:00
dtc@bc895d6d09 dtc: add submodule 2013-04-18 13:50:53 +02:00
fpu fpu: softfloat: drop INLINE macro 2014-06-23 11:00:12 -04:00
fsdev virtfs-proxy-helper: fix call to accept 2014-04-28 08:55:32 +04:00
gdb-xml target-arm: Support fp registers in gdb stub 2013-12-17 19:42:32 +00:00
hw virtio-blk: fix reference a pointer which might be freed 2014-08-20 11:57:05 +02:00
include block: Add bdrv_refresh_filename() 2014-08-20 14:31:56 +02:00
libcacard vscclient: Add required headers to fix build on FreeBSD 2014-06-24 20:01:24 +04:00
libdecnumber libdecnumber: Fix decNumberSetBCD 2014-06-16 13:24:29 +02:00
linux-headers linux-headers: update linux headers to kvm/next 2014-06-16 13:24:41 +02:00
linux-user linux-user: use TARGET_SA_ONSTACK in get_sigframe 2014-07-15 17:08:41 +03:00
net tap-bsd: implement a FreeBSD only version of tap_open 2014-08-01 15:57:48 +00:00
pc-bios pc-bios/s390-ccw: update binary 2014-07-08 15:08:03 +02:00
pixman@97336fad32 qapi: move include files to include/qobject/ 2012-12-19 08:31:31 +01:00
po po: Add Chinese translation 2014-08-09 00:06:41 +04:00
qapi QMP: Add support for Archipelago 2014-08-15 15:07:14 +02:00
qga channel-posix: using qemu_set_nonblock() instead of fcntl(O_NONBLOCK) 2014-08-15 18:03:13 +01:00
qobject json-lexer: fix escaped backslash in single-quoted string 2014-06-23 11:01:24 -04:00
qom qom: object: move unparenting to the child property's release callback 2014-08-17 23:25:24 +02:00
roms pseries: Update SLOF firmware image to qemu-slof-20140630 2014-07-08 12:10:36 +02:00
scripts trace: teach lttng backend to use format strings 2014-08-12 14:26:12 +01:00
slirp Increase maximum number of session of the internal TFTP server. 2014-06-24 20:01:24 +04:00
stubs monitor: fix use after free 2014-08-18 14:39:10 -04:00
sysconfigs/target Eliminate cpus-x86_64.conf file 2012-09-21 15:12:58 +02:00
target-alpha trace: [tcg] Include TCG-tracing header on all targets 2014-08-12 14:26:12 +01:00
target-arm trace: [tcg] Include TCG-tracing header on all targets 2014-08-12 14:26:12 +01:00
target-cris trace: [tcg] Include TCG-tracing header on all targets 2014-08-12 14:26:12 +01:00
target-i386 Tracing pull request 2014-08-15 16:37:17 +01:00
target-lm32 trace: [tcg] Include TCG-tracing header on all targets 2014-08-12 14:26:12 +01:00
target-m68k trace: [tcg] Include TCG-tracing header on all targets 2014-08-12 14:26:12 +01:00
target-microblaze trace: [tcg] Include TCG-tracing header on all targets 2014-08-12 14:26:12 +01:00
target-mips trace: [tcg] Include TCG-tracing header on all targets 2014-08-12 14:26:12 +01:00
target-moxie softmmu: introduce cpu_ldst.h 2014-06-05 16:10:33 +02:00
target-openrisc trace: [tcg] Include TCG-tracing header on all targets 2014-08-12 14:26:12 +01:00
target-ppc trace: [tcg] Include TCG-tracing header on all targets 2014-08-12 14:26:12 +01:00
target-s390x trace: [tcg] Include TCG-tracing header on all targets 2014-08-12 14:26:12 +01:00
target-sh4 trace: [tcg] Include TCG-tracing header on all targets 2014-08-12 14:26:12 +01:00
target-sparc target-sparc64: implement Short Floating-Point Store Instructions 2014-08-17 13:24:27 +01:00
target-unicore32 trace: [tcg] Include TCG-tracing header on all targets 2014-08-12 14:26:12 +01:00
target-xtensa trace: [tcg] Include TCG-tracing header on all targets 2014-08-12 14:26:12 +01:00
tcg tcg/ppc: Fix support for 64-bit PPC MacOSX hosts 2014-06-29 11:38:50 +01:00
tests qemu-iotests: add test case 101 for short file I/O 2014-08-22 11:01:12 +02:00
trace trace: [tcg] Generate TCG tracing routines 2014-08-12 14:26:12 +01:00
ui spice: don't use 'Yoda conditions' 2014-08-15 18:54:07 +04:00
util trivial patches for 2014-08-15 2014-08-15 18:44:48 +01:00
.exrc qemu: add .exrc 2012-09-07 09:02:44 +03:00
.gitignore trace: [tcg] Generate TCG tracing routines 2014-08-12 14:26:12 +01:00
.gitmodules PPC: Add u-boot firmware for e500 2014-06-16 13:24:35 +02:00
.mailmap Update mailmap 2013-09-05 09:40:31 -05:00
.travis.yml trace: Multi-backend tracing 2014-06-09 15:43:40 +02:00
aio-posix.c AioContext: speed up aio_notify 2014-07-09 15:50:11 +02:00
aio-win32.c block: drop aio functions that operate on the main AioContext 2014-07-09 15:50:11 +02:00
arch_init.c Show length mismatch error is hex 2014-08-09 00:06:32 +04:00
async.c AioContext: speed up aio_notify 2014-07-09 15:50:11 +02:00
balloon.c qapi event: convert BALLOON_CHANGE 2014-06-23 11:12:28 -04:00
block-migration.c block: Use g_new() & friends where that makes obvious sense 2014-08-20 11:51:28 +02:00
block.c block: Add bdrv_refresh_filename() 2014-08-20 14:31:56 +02:00
blockdev-nbd.c block: Use g_new() & friends where that makes obvious sense 2014-08-20 11:51:28 +02:00
blockdev.c block: acquire AioContext in qmp_block_resize() 2014-08-20 11:53:42 +02:00
blockjob.c block: prefer aio_poll to qemu_aio_wait 2014-07-09 15:50:11 +02:00
bt-host.c sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
bt-vhci.c sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
Changelog Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
CODING_STYLE CODING_STYLE: Section about conditional statement 2014-08-15 18:54:06 +04:00
configure Block patches 2014-08-15 14:49:50 +01:00
COPYING
COPYING.LIB
coroutine-gthread.c glib-compat.h: add new thread API emulation on top of pre-2.31 API 2014-06-10 07:44:01 +02:00
coroutine-sigaltstack.c Merge remote-tracking branch 'kwolf/for-anthony' into staging 2013-02-26 07:44:39 -06:00
coroutine-ucontext.c Fix warnings suppressors to honor --disable-werror 2013-04-17 10:28:04 -05:00
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 trace: add some tcg tracing support 2014-08-12 14:26:12 +01:00
cpus.c monitor: Add drift info to 'info jit' 2014-08-07 15:09:48 +02:00
cputlb.c softmmu: introduce cpu_ldst.h 2014-06-05 16:10:33 +02:00
device_tree.c device_tree: qemu_fdt_setprop: Rename val_array arg 2013-12-20 01:58:12 +01:00
device-hotplug.c blockdev: Remove unused DriveInfo reference count 2014-06-16 17:23:19 +08:00
disas.c monitor: QEMU Monitor Instruction Disassembly Incorrect for PowerPC LE Mode 2014-06-16 13:24:26 +02:00
dma-helpers.c dma-helpers: Fix too long qiov 2014-07-14 12:03:21 +02:00
dump.c dump.c: Fix memory leak issue in cleanup processing for dump_init() 2014-08-18 14:39:10 -04:00
exec.c SCSI changes that enable sending vendor-specific commands via virtio-scsi. 2014-08-19 13:00:57 +01:00
gdbstub.c exec: Change cpu_breakpoint_{insert,remove{,_by_ref,_all}} argument 2014-03-13 19:20:48 +01:00
HACKING HACKING: Document vaddr type usage 2013-07-23 02:41:31 +02:00
hmp-commands.hx Add the vhost-user netdev backend to the command line 2014-06-19 18:44:18 +03:00
hmp.c block: add backing-file option to block-stream 2014-07-01 10:47:01 +02:00
hmp.h hmp: add info memdev 2014-06-19 18:44:21 +03:00
iohandler.c iohandler.c: Properly initialize sigaction struct 2014-05-24 00:07:29 +04:00
ioport.c memory: convert memory_region_destroy to object_unparent 2014-08-18 12:06:20 +02:00
iothread.c AioContext: do not rely on aio_poll(ctx, true) result to end a loop 2014-07-14 12:03:20 +02:00
kvm-all.c kvm-all: Use 'tmpcpu' instead of 'cpu' in sub-looping to avoid 'cpu' be NULL 2014-07-22 12:38:17 +02:00
kvm-stub.c Add kvm_eventfds_enabled function 2014-06-19 16:41:54 +03:00
LICENSE LICENSE: clarify 2013-08-12 09:15:12 -05:00
main-loop.c block: drop aio functions that operate on the main AioContext 2014-07-09 15:50:11 +02:00
MAINTAINERS block: Support Archipelago as a QEMU block backend 2014-08-15 15:07:14 +02:00
Makefile Tracing pull request 2014-08-15 16:37:17 +01:00
Makefile.objs Tracing pull request 2014-08-15 16:37:17 +01:00
Makefile.target trace: [tcg] Define TCG tracing helper routines 2014-08-12 14:26:12 +01:00
memory_mapping.c cpu: Use QTAILQ for CPU list 2013-09-03 12:25:55 +02:00
memory.c Revert "memory: Use canonical path component as the name" 2014-08-19 20:05:46 +01:00
migration-exec.c aio / timers: Untangle include files 2013-08-22 19:10:27 +02:00
migration-fd.c aio / timers: Untangle include files 2013-08-22 19:10:27 +02:00
migration-rdma.c rdma: bug fixes 2014-06-23 19:09:50 +02:00
migration-tcp.c Coverity: Fix failure path for qemu_accept in migration 2014-05-05 22:15:03 +02:00
migration-unix.c Coverity: Fix failure path for qemu_accept in migration 2014-05-05 22:15:03 +02:00
migration.c migration: catch unknown flags in ram_load 2014-06-16 04:55:27 +02:00
module-common.c module: implement module loading 2014-02-20 13:14:18 +01:00
monitor.c monitor: fix use after free 2014-08-18 14:39:10 -04:00
nbd.c nbd: Handle NBD_OPT_LIST option. 2014-06-30 12:50:17 +02:00
numa.c numa: show hex number in error message for consistency and prefix them with 0x 2014-08-14 13:22:07 +02:00
os-posix.c oslib-posix: Fix build on FreeBSD 2014-03-13 14:34:16 +00:00
os-win32.c util: Split out exec_dir from os_find_datadir 2014-02-20 13:12:54 +01:00
page_cache.c migration: Plug memory leak in migrate-set-cache-size command 2014-06-10 19:54:43 +04:00
qapi-schema.json backends: Introduce chr-testdev 2014-08-06 17:53:05 +02:00
qdev-monitor.c trivial patches for 2014-08-15 2014-08-15 18:44:48 +01:00
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 Block pull request 2014-08-18 11:59:27 +01:00
qemu-coroutine-io.c aio / timers: Untangle include files 2013-08-22 19:10:27 +02:00
qemu-coroutine-lock.c coroutine: remove qemu_co_queue_wait_insert_head 2013-12-02 17:11:49 +01:00
qemu-coroutine-sleep.c coroutine: add co_aio_sleep_ns() to allow sleep in block drivers 2013-10-30 12:22:09 +01:00
qemu-coroutine.c coroutine: make pool size dynamic 2014-08-15 15:07:14 +02:00
qemu-doc.texi doc: slirp supports ICMP echo if enabled in Linux 2014-07-18 17:45:37 +04:00
qemu-file.c Make qemu_peek_buffer loop until it gets it's data 2014-05-05 22:15:03 +02:00
qemu-img-cmds.hx qemu-img: Allow source cache mode specification 2014-08-22 14:54:44 +02:00
qemu-img.c qemu-img: Allow source cache mode specification 2014-08-22 14:54:44 +02:00
qemu-img.texi qemu-img: Allow source cache mode specification 2014-08-22 14:54:44 +02:00
qemu-io-cmds.c qemu-io-cmds: g_renew() can't fail, bury dead error handling 2014-08-20 11:51:28 +02:00
qemu-io.c block: Use g_new() & friends where that makes obvious sense 2014-08-20 11:51:28 +02:00
qemu-log.c qemu-log: default to stderr for logging output 2013-02-26 13:31:47 -06:00
qemu-nbd.c nbd: Shutdown socket before closing. 2014-06-30 12:50:12 +02:00
qemu-nbd.texi nbd: Miscellaneous typo fixes. 2014-05-24 00:07:29 +04:00
qemu-options-wrapper.h vl.c: In qemu -h output, only print options for the arch we are running as 2011-12-19 10:27:33 -06:00
qemu-options.h vl.c: Move option generation logic into a wrapper file 2011-12-19 10:27:33 -06:00
qemu-options.hx Block pull request 2014-08-18 11:59:27 +01:00
qemu-seccomp.c seccomp: add shmctl(), mlock(), and munlock() to the syscall whitelist 2014-04-25 14:52:03 -03:00
qemu-tech.texi qemu-tech.texi: update implemented xtensa features list 2012-11-29 13:00:52 -06:00
qemu-timer.c vl.c: remove init_clocks call from main 2014-05-09 20:57:32 +02:00
qemu.nsi nsis: Improved support for parallel installation of 32 and 64 bit code 2013-11-07 07:02:44 +01:00
qemu.sasl sasl: Avoid 'Could not find keytab file' in syslog 2014-03-15 13:54:18 +04:00
qmp-commands.hx block: add backing-file option to block-stream 2014-07-01 10:47:01 +02:00
qmp.c qmp: hide "hotplugged" device property from device-list-properties 2014-08-15 15:07:13 +02:00
qtest.c icount: Add QemuOpts for icount 2014-08-06 17:53:07 +02:00
README Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
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 softmmu: move softmmu_template.h out of include/ 2014-06-05 16:10:33 +02:00
spice-qemu-char.c qemu-char: introduce qemu_chr_alloc 2014-06-23 11:12:28 -04:00
tcg-runtime.c tcg: Push tcg-runtime routines into exec/helper-* 2014-05-28 09:33:54 -07:00
tci.c Merge remote-tracking branch 'remotes/bonzini/softmmu-smap' into staging 2014-06-05 21:06:14 +01:00
thread-pool.c thread-pool: avoid deadlock in nested aio_poll() calls 2014-08-15 15:07:14 +02:00
thunk.c exec: move include files to include/exec/ 2012-12-19 08:31:31 +01:00
tpm.c Use error_is_set() only when necessary 2014-02-17 11:57:23 -05:00
trace-events virtio-rng: add some trace events 2014-08-12 14:29:55 +01:00
translate-all.c trace: add some tcg tracing support 2014-08-12 14:26:12 +01:00
translate-all.h translate-all: Change tb_check_watchpoint() argument to CPUState 2014-03-13 19:20:48 +01:00
user-exec.c softmmu: introduce cpu_ldst.h 2014-06-05 16:10:33 +02:00
VERSION Open 2.2 development tree 2014-08-01 18:30:08 +01:00
version.rc Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
vl.c vl: free err 2014-08-15 18:54:07 +04:00
vmstate.c vmstate: Add preallocation for migrating arrays (VMS_ALLOC flag) 2014-06-27 13:48:27 +02:00
xbzrle.c xbzrle.c: Avoid undefined behaviour with signed arithmetic 2014-04-18 10:33:36 +04:00
xen-common-stub.c xen: factor out common functions 2014-05-07 16:16:43 +00:00
xen-common.c xen: factor out common functions 2014-05-07 16:16:43 +00:00
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: fix usage of ENODATA 2014-08-01 15:57:28 +00:00
xen-mapcache.c xen: build on ARM 2014-07-07 10:37:40 +00:00

README 

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

- QEMU team