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Max Reitz 94054183da qcow2: Optimize bdrv_make_empty() 
bdrv_make_empty() is currently only called if the current image
represents an external snapshot that has been committed to its base
image; it is therefore unlikely to have internal snapshots. In this
case, bdrv_make_empty() can be greatly sped up by emptying the L1 and
refcount table (while having the dirty flag set, which only works for
compat=1.1) and creating a trivial refcount structure.

If there are snapshots or for compat=0.10, fall back to the simple
implementation (discard all clusters).

[Applied s/clusters/cluster/ typo fix suggested by Eric Blake
--Stefan]

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 1414159063-25977-4-git-send-email-mreitz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-11-03 11:41:48 +00:00
audio
backends pci, pc, virtio, misc bugfixes 2014-09-18 20:02:01 +01:00
block qcow2: Optimize bdrv_make_empty() 2014-11-03 11:41:48 +00:00
bsd-user
default-configs PPC: Fix default config ordering and add eTSEC for ppc64 2014-09-08 12:50:54 +02:00
disas disas/libvixl/a64/instructions-a64.h: Remove unused constants 2014-10-24 12:19:12 +01:00
docs virtio-scsi fixes, the first part of dynamic sysbus devices, 2014-10-30 13:35:12 +00:00
dtc@bc895d6d09
fpu softfloat: add functions corresponding to IEEE-2008 min/maxNumMag 2014-10-14 13:28:51 +01:00
fsdev
gdb-xml s390x/gdb: add the feature xml files for s390x 2014-09-01 09:45:19 +02:00
hw ahci: Fix SDB FIS Construction 2014-11-03 09:48:41 +00:00
include qcow2: Optimize bdrv_make_empty() 2014-11-03 11:41:48 +00:00
libcacard libcacard: don't free sign buffer while sign op is pending 2014-10-28 11:38:18 +01:00
libdecnumber
linux-headers linux-headers: update to 3.17-rc7 2014-10-10 10:37:47 +02:00
linux-user translate-all.c: memory walker initial address miscalculation 2014-10-06 21:53:35 +03:00
net Net patches 2014-09-04 17:39:07 +01:00
pc-bios linuxboot: compute initrd loading address 2014-10-09 15:36:15 +02:00
pixman@87eea99e44 pixman: update internal copy to pixman-0.32.6 2014-09-15 08:14:19 +02:00
po po: fix conflict with %.mo rule in rules.mak 2014-09-26 13:35:08 +02:00
qapi qapi: Add corrupt field to ImageInfoSpecificQCow2 2014-10-04 19:18:17 +01:00
qga qga: Rewrite code where using readdir_r 2014-10-22 07:49:52 -05:00
qobject
qom qom: Demote already-has-a-parent to a regular error 2014-10-23 16:41:25 +02:00
roms Update OpenBIOS images 2014-09-25 13:34:03 +01:00
scripts get_maintainer.pl: restrict cases where it falls back to --git 2014-10-23 16:41:27 +02:00
slirp slirp: udp: fix NULL pointer dereference because of uninitialized socket 2014-09-23 19:15:05 +01:00
stubs block: Code motion to get rid of stubs/blockdev.c 2014-10-20 13:41:26 +02:00
sysconfigs/target
target-alpha target-alpha: Use cpu_exec_interrupt qom hook 2014-09-25 18:54:21 +01:00
target-arm target-arm: A32: Emulate the SMC instruction 2014-10-24 12:19:15 +01:00
target-cris gdbstub: Allow target CPUs to specify watchpoint STOP_BEFORE_ACCESS flag 2014-10-06 14:25:43 +01:00
target-i386 target-i386: add Intel AVX-512 support 2014-10-24 18:03:14 +02:00
target-lm32 gdbstub: Allow target CPUs to specify watchpoint STOP_BEFORE_ACCESS flag 2014-10-06 14:25:43 +01:00
target-m68k target-m68k: Use cpu_exec_interrupt qom hook 2014-09-25 18:54:21 +01:00
target-microblaze target-microblaze: Use cpu_exec_interrupt qom hook 2014-09-25 18:54:22 +01:00
target-mips target-mips: add ULL suffix in bitswap to avoid compiler warning 2014-10-24 14:07:51 +01:00
target-moxie
target-openrisc target-openrisc: Use cpu_exec_interrupt qom hook 2014-09-25 18:54:22 +01:00
target-ppc qdev: Drop legacy_name from qdev properties 2014-10-15 05:03:15 +02:00
target-s390x s390x/migration: migrate CPU state 2014-10-10 13:31:51 +02:00
target-sh4 target-sh4: Use cpu_exec_interrupt qom hook 2014-09-25 18:54:22 +01:00
target-sparc target-sparc: Use cpu_exec_interrupt qom hook 2014-09-25 18:54:22 +01:00
target-tricore target-tricore: Add instructions of BO opcode format 2014-10-20 12:25:07 +01:00
target-unicore32 target-unicore32: Use cpu_exec_interrupt qom hook 2014-09-25 18:54:22 +01:00
target-xtensa gdbstub: Allow target CPUs to specify watchpoint STOP_BEFORE_ACCESS flag 2014-10-06 14:25:43 +01:00
tcg tcg/mips: fix store softmmu slow path 2014-11-02 13:30:00 +01:00
tests iotests: Add test for external image truncation 2014-11-03 11:41:47 +00:00
trace trace: [hmp] Reimplement "trace-event" and "info trace-events" using QMP 2014-09-26 09:34:38 +01:00
ui vnc: return directly if no vnc client connected 2014-10-30 18:21:25 +00:00
util Four changes here. Polling for reconnection of character devices, 2014-10-09 15:09:05 +01:00
.exrc
.gitignore
.gitmodules
.mailmap
.travis.yml .travis.yml: remove "make check" from main matrix 2014-09-26 21:05:06 +04:00
accel.c accel: Create accel object when initializing machine 2014-10-09 15:36:14 +02:00
aio-posix.c
aio-win32.c aio-win32: avoid out-of-bounds access to the events array 2014-09-22 11:39:21 +01:00
arch_init.c migration: catch unknown flag combinations in ram_load 2014-10-14 11:24:20 +02:00
async.c async: aio_context_new(): Handle event_notifier_init failure 2014-09-22 11:39:48 +01:00
balloon.c
block-migration.c block: Rename BlockDriverAIOCB* to BlockAIOCB* 2014-10-20 13:41:27 +02:00
block.c block.c: Fix type of IoOperationType variable in send_qmp_error_event() 2014-11-03 09:48:41 +00:00
blockdev-nbd.c
blockdev.c block: Lift device model API into BlockBackend 2014-10-20 14:03:50 +02:00
blockjob.c block: Rename BlockDriverCompletionFunc to BlockCompletionFunc 2014-10-20 13:41:27 +02:00
bootdevice.c bootindex: change fprintf to error_report 2014-10-15 10:46:01 +02:00
bt-host.c
bt-vhci.c
Changelog
CODING_STYLE
configure configure: Prepend pixman and ftd flags to overrule system-provided ones 2014-10-15 12:20:27 +02:00
COPYING
COPYING.LIB
coroutine-gthread.c
coroutine-sigaltstack.c
coroutine-ucontext.c
coroutine-win32.c
cpu-exec.c cpu-exec: Do CPU_INTERRUPT_HALT unconditionally 2014-09-25 18:54:22 +01:00
cpus.c Introduce cpu_clean_all_dirty 2014-09-16 11:04:09 +02:00
cputlb.c implementing victim TLB for QEMU system emulated TLB 2014-09-01 17:43:06 +01:00
device_tree.c device_tree.c: dump all err mesages with error_report 2014-09-02 22:38:16 +04:00
device-hotplug.c blockdev: Eliminate drive_del() 2014-10-20 13:41:26 +02:00
disas.c
dma-helpers.c hw: Convert from BlockDriverState to BlockBackend, mostly 2014-10-20 14:02:25 +02:00
dump.c dump: Turn some functions to void to make code cleaner 2014-10-23 09:01:29 -04:00
exec.c exec.c: fix setting 1-byte-long watchpoints 2014-09-19 17:42:16 +01:00
gdbstub.c gdbstub: Allow target CPUs to specify watchpoint STOP_BEFORE_ACCESS flag 2014-10-06 14:25:43 +01:00
HACKING
hmp-commands.hx hmp: Remove "info pcmcia" 2014-10-24 12:19:11 +01:00
hmp.c Add HMP command "info memory-devices" 2014-09-26 13:37:06 -04:00
hmp.h Add HMP command "info memory-devices" 2014-09-26 13:37:06 -04:00
iohandler.c
ioport.c
iothread.c async: aio_context_new(): Handle event_notifier_init failure 2014-09-22 11:39:48 +01:00
kvm-all.c kvm fix compilation with GCC 4.3.4 2014-10-10 14:07:08 +01:00
kvm-stub.c accel: Move KVM accel registration to kvm-all.c 2014-10-04 08:59:15 +02:00
LICENSE
main-loop.c Revert "main-loop.c: Handle SIGINT, SIGHUP and SIGTERM synchronously" 2014-10-27 15:05:09 +00:00
MAINTAINERS virtio-scsi fixes, the first part of dynamic sysbus devices, 2014-10-30 13:35:12 +00:00
Makefile trace: install trace-events file 2014-09-26 09:34:39 +01:00
Makefile.objs qemu-file: Move stdio implementation to qemu-file-stdio.c 2014-10-14 10:29:28 +02:00
Makefile.target bootdevice: move bootdevice related code to new file bootdevice.c 2014-10-15 09:49:48 +02:00
memory_mapping.c
memory.c memory: add parameter errp to memory_region_init_rom_device 2014-09-09 13:41:44 +02:00
migration-exec.c
migration-fd.c
migration-rdma.c rdma: Fix incorrect description in comments 2014-09-20 17:55:53 +04:00
migration-tcp.c qemu-sockets: Add error to non-blocking connect handler 2014-10-09 15:36:15 +02:00
migration-unix.c qemu-sockets: Add error to non-blocking connect handler 2014-10-09 15:36:15 +02:00
migration.c block/migration: Disable cache invalidate for incoming migration 2014-10-14 09:35:21 +02:00
module-common.c
monitor.c hmp: Remove "info pcmcia" 2014-10-24 12:19:11 +01:00
nbd.c block/migration: Disable cache invalidate for incoming migration 2014-10-14 09:35:21 +02:00
numa.c memory: add parameter errp to memory_region_init_ram 2014-09-09 13:41:43 +02:00
os-posix.c os-posix: report error message when lock file failed 2014-09-26 21:21:09 +04:00
os-win32.c
page_cache.c
qapi-schema.json qmp: Print descriptions of object properties 2014-10-15 05:03:15 +02:00
qdev-monitor.c qmp: Print descriptions of object properties 2014-10-15 05:03:15 +02:00
qdict-test-data.txt
qemu-bridge-helper.c
qemu-char.c qemu-char: Fix reconnect socket error reporting 2014-10-09 15:36:15 +02:00
qemu-coroutine-io.c
qemu-coroutine-lock.c
qemu-coroutine-sleep.c
qemu-coroutine.c
qemu-doc.texi block: delete cow block driver 2014-09-22 11:39:45 +01:00
qemu-file-stdio.c qemu-file: Move stdio implementation to qemu-file-stdio.c 2014-10-14 10:29:28 +02:00
qemu-file-unix.c qemu-file: Move unix and socket implementations to qemu-file-unix.c 2014-10-14 10:29:28 +02:00
qemu-file.c qemu-file: Move stdio implementation to qemu-file-stdio.c 2014-10-14 10:29:28 +02:00
qemu-img-cmds.hx
qemu-img.c qemu-img: Print error if check failed 2014-10-23 19:42:07 +02:00
qemu-img.texi block: delete cow block driver 2014-09-22 11:39:45 +01:00
qemu-io-cmds.c qemu-io: Respect early image end for map 2014-10-23 15:34:02 +02:00
qemu-io.c block: Make BlockBackend own its BlockDriverState 2014-10-20 13:41:26 +02:00
qemu-log.c
qemu-nbd.c block: Make BlockBackend own its BlockDriverState 2014-10-20 13:41:26 +02:00
qemu-nbd.texi
qemu-options-wrapper.h
qemu-options.h
qemu-options.hx aio / timers: De-document -clock 2014-10-27 16:11:45 +01:00
qemu-seccomp.c
qemu-tech.texi
qemu-timer.c
qemu.nsi
qemu.sasl
qmp-commands.hx add input-send-event command 2014-10-02 09:58:14 +02:00
qmp.c qmp: Print descriptions of object properties 2014-10-15 05:03:15 +02:00
qtest.c qtest: fix qtest log fd should be initialized before qtest chardev 2014-10-23 16:41:27 +02:00
README
rules.mak Fix cross compilation (nm command) 2014-09-19 17:20:11 +01:00
savevm.c snapshot: Reset err to NULL to avoid double free 2014-11-03 09:48:41 +00:00
softmmu_template.h implementing victim TLB for QEMU system emulated TLB 2014-09-01 17:43:06 +01:00
spice-qemu-char.c qemu-char: Rename register_char_driver_qapi() to register_char_driver() 2014-09-16 23:36:32 +01:00
tcg-runtime.c
tci.c
thread-pool.c block: Rename BlockDriverCompletionFunc to BlockCompletionFunc 2014-10-20 13:41:27 +02:00
thunk.c
tpm.c
trace-events hw: Convert from BlockDriverState to BlockBackend, mostly 2014-10-20 14:02:25 +02:00
translate-all.c translate-all.c: memory walker initial address miscalculation 2014-10-06 21:53:35 +03:00
translate-all.h
user-exec.c
VERSION
version.rc
vl.c Make qemu_shutdown_requested signal-safe 2014-10-27 14:09:27 +00:00
vmstate.c vmstate: Allow dynamic allocation for VBUFFER during migration 2014-10-14 09:35:48 +02:00
xbzrle.c
xen-common-stub.c accel: Move Xen registration code to xen-common.c 2014-10-04 08:59:15 +02:00
xen-common.c accel: Pass MachineState object to accel init functions 2014-10-09 12:57:10 +02:00
xen-hvm-stub.c
xen-hvm.c xen-hvm.c: Add support for Xen access to vmport 2014-10-30 14:16:38 +00:00
xen-mapcache.c

README 

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

- QEMU team