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# Date Author Comment
8d278467 05/19/2011 11:26 am Markus Armbruster

block: Remove type hint, it's guest matter, doesn't belong here

No users of bdrv_get_type_hint() left. bdrv_set_type_hint() can make
the media removable by side effect. Make that explicit.

Signed-off-by: Markus Armbruster <>
Signed-off-by: Kevin Wolf <>

db593f25 02/07/2011 01:51 pm Marcelo Tosatti

Add flag to indicate external users to block device

Certain operations such as drive_del or resize cannot be performed
while external users (eg. block migration) reference the block device.

Add a flag to indicate that.

Signed-off-by: Marcelo Tosatti <>...

db97ee6a 01/31/2011 11:03 am Christoph Hellwig

block: tell drivers about an image resize

Extend the change_cb callback with a reason argument, and use it
to tell drivers about size changes.

Signed-off-by: Christoph Hellwig <>
Signed-off-by: Kevin Wolf <>

75411d23 12/17/2010 05:11 pm Stefan Hajnoczi

qed: Add QEMU Enhanced Disk image format

This patch introduces the qed on-disk layout and implements image
creation. Later patches add read/write and other functionality.

Signed-off-by: Stefan Hajnoczi <>
Signed-off-by: Kevin Wolf <>

bb8bf76f 12/17/2010 05:11 pm Christoph Hellwig

block: add discard support

Add a new bdrv_discard method to free blocks in a mapping image, and a new
drive property to set the granularity for these discard. If no discard
granularity support is set discard support is disabled.

Signed-off-by: Christoph Hellwig <>...

eec77d9e 12/14/2010 04:44 pm Jes Sorensen

qemu-img: Deprecate obsolete -6 and -e options

If -6 or -e is specified, an error message is printed and we exit. It
does not print help() to avoid the error message getting lost in the

Signed-off-by: Jes Sorensen <>
Signed-off-by: Kevin Wolf <>

1ca4d09a 12/11/2010 11:32 pm Gleb Natapov

Add bootindex parameter to net/block/fd device

If bootindex is specified on command line a string that describes device
in firmware readable way is added into sorted list. Later this list will
be passed into firmware to control boot order.

Signed-off-by: Gleb Natapov <>...

205ef796 11/04/2010 01:52 pm Kevin Wolf

block: Allow bdrv_flush to return errors

This changes bdrv_flush to return 0 on success and -errno in case of failure.
It's a requirement for implementing proper error handle in users of bdrv_flush.

Signed-off-by: Kevin Wolf <>
Reviewed-by: Stefan Hajnoczi <>

51ef6727 10/22/2010 03:49 pm edison

Copy snapshots out of QCOW2 disk

In order to backup snapshots, created from QCOW2 iamge, we want to copy snapshots out of QCOW2 disk to a seperate storage.
The following patch adds a new option in "qemu-img": qemu-img convert -f qcow2 -O qcow2 -s snapshot_name src_img bck_img....

8b33d9ee 09/09/2010 01:09 am Anthony Liguori

Revert "Make default invocation of block drivers safer (v3)"

This reverts commit 79368c81bf8cf93864d7afc88b81b05d8f0a2c90.



I haven't been able to come up with a solution yet for the corruption caused by
unaligned requests from the IDE disk so revert until a solution can be written....

336c1c12 08/03/2010 04:57 pm Kevin Wolf

block: Fix bdrv_has_zero_init

Assuming that any image on a block device is not properly zero-initialized is
actually wrong: Only raw images have this problem. Any other image format
shouldn't care about it, they initialize everything properly themselves....

4be9762a 08/03/2010 04:57 pm Markus Armbruster

block: Change bdrv_eject() not to drop the image

bdrv_eject() gets called when a device model opens or closes the tray.

If the block driver implements method bdrv_eject(), that method gets
called. Drivers host_cdrom implements it, and it opens and closes the...

55459498 07/26/2010 02:39 pm Christoph Hellwig

block: default to 0 minimal / optiomal I/O size

Currently we set them to 512 bytes unless manually specified. Unforuntaly
some brain-dead partitioning tools create unaligned partitions if they
get low enough optiomal I/O size values, so don't report any at all...

79368c81 07/15/2010 04:17 pm Anthony Liguori

Make default invocation of block drivers safer (v3)

CVE-2008-2004 described a vulnerability in QEMU whereas a malicious user could
trick the block probing code into accessing arbitrary files in a guest. To
mitigate this, we added an explicit format parameter to -drive which disabling...

9ac228e0 07/06/2010 06:05 pm Kevin Wolf

qcow2/vdi: Change check to distinguish error cases

This distinguishes between harmless leaks and real corruption. Hopefully users
better understand what qemu-img check wants to tell them.

Signed-off-by: Kevin Wolf <>

f8b6cc00 07/02/2010 02:18 pm Markus Armbruster

qdev: Decouple qdev_prop_drive from DriveInfo

Make the property point to BlockDriverState, cutting out the DriveInfo
middleman. This prepares the ground for block devices that don't have
a DriveInfo.

Currently all user-defined ones have a DriveInfo, because the only way...

18846dee 07/02/2010 02:18 pm Markus Armbruster

block: Catch attempt to attach multiple devices to a blockdev

For instance, -device scsi-disk,drive=foo -device scsi-disk,drive=foo
happily creates two SCSI disks connected to the same block device.
It's all downhill from there.

Device usb-storage deliberately attaches twice to the same blockdev,...

1e297c32 06/22/2010 03:38 pm Christoph Hellwig

block: fix physical_block_size calculation

Both SCSI and virtio expect the physical block size relative to the
logical block size. So get the factor first before calculating the

Reported-by: Mike Cao <>
Signed-off-by: Christoph Hellwig <>...

abd7f68d 06/15/2010 10:41 am Markus Armbruster

block: Move error actions from DriveInfo to BlockDriverState

That's where they belong semantically (block device host part), even
though the actions are actually executed by guest device code.

Signed-off-by: Markus Armbruster <>
Signed-off-by: Kevin Wolf <>

294cc35f 05/03/2010 11:07 am Kevin Wolf

block: Add wr_highest_sector blockstat

This adds the wr_highest_sector blockstat which implements what is generally
known as the high watermark. It is the highest offset of a sector written to
the respective BlockDriverState since it has been opened.

The query-blockstat QMP command is extended to add this value to the result,...

66f82cee 05/03/2010 11:07 am Kevin Wolf

block: Open the underlying image file in generic code

Format drivers shouldn't need to bother with things like file names, but rather
just get an open BlockDriverState for the underlying protocol. This patch
introduces this behaviour for bdrv_open implementation. For protocols which...

b66460e4 04/23/2010 05:21 pm Stefan Hajnoczi

block: Do not export bdrv_first

The bdrv_first linked list of BlockDriverStates is currently extern so
that block migration can iterate the list. However, since there is
already a bdrv_iterate() function there is no need to expose bdrv_first.

Signed-off-by: Stefan Hajnoczi <>...

1b7bdbc1 04/23/2010 05:21 pm Stefan Hajnoczi

block: Convert bdrv_first to QTAILQ

Signed-off-by: Stefan Hajnoczi <>
Signed-off-by: Kevin Wolf <>

8a22f02a 04/23/2010 05:21 pm Stefan Hajnoczi

block: Convert first_drv to QLIST

Signed-off-by: Stefan Hajnoczi <>
Signed-off-by: Kevin Wolf <>

8b9b0cc2 04/23/2010 05:08 pm Kevin Wolf

blkdebug: Add events and rules

Block drivers can trigger a blkdebug event whenever they reach a place where it
could be useful to inject an error for testing/debugging purposes.

Rules are read from a blkdebug config file and describe which action is taken...

8cfacf07 03/17/2010 05:42 pm Christoph Hellwig

block: add logical_block_size property

Add a logical block size attribute as various guest side tools only
increase the filesystem sector size based on it, not the advisory
physical block size.

For scsi we already have support for a different logical block size...

4dca4b63 02/19/2010 11:32 pm Naphtali Sprei

block: more read-only changes, related to backing files

Open backing file read-only where possible
Upgrade backing file to read-write during commit, back to read-only after commit
If upgrade fail, back to read-only. If also fail, "disconnect" the drive....

428c149b 02/11/2010 12:53 am Christoph Hellwig

block: add topology qdev properties

Add three new qdev properties to export block topology information to
the guest. This is needed to get optimal I/O alignment for RAID arrays
or SSDs.

The options are:

- physical_block_size to specify the physical block size of the device,...
aaa0eb75 02/10/2010 12:56 am Liran Schour

Count dirty blocks and expose an API to get dirty count

This will manage dirty counter for each device and will allow to get the
dirty counter from above.

Signed-off-by: Liran Schour <>
Signed-off-by: Anthony Liguori <>

756e6736 01/14/2010 01:14 am Kevin Wolf

block: Add bdrv_change_backing_file

Introduce the functions needed to change the backing file of an image. The
function is implemented for qcow2.

Signed-off-by: Kevin Wolf <>
Signed-off-by: Anthony Liguori <>

12c09b8c 12/03/2009 07:45 pm Kevin Wolf

qemu-img: There is more than one host device driver

I haven't heard yet of anyone using qemu-img to copy an image to a real floppy,
but it's a valid use case.

Signed-off-by: Kevin Wolf <>
Signed-off-by: Anthony Liguori <>

c6d22830 12/03/2009 06:48 pm Jan Kiszka

block migration: Cleanup dirty tracking code

This switches the dirty bitmap to a true bitmap, reducing its footprint
(specifically in caches). It moreover fixes off-by-one bugs in
set_dirty_bitmap (nb_sectors+1 were marked) and bdrv_get_dirty (limit
check allowed one sector behind end of drive). And is drops redundant...

7cd1e32a 11/17/2009 04:03 pm

Expose a mechanism to trace block writes

To support live migration without shared storage we need to be able to trace
writes to disk while migrating. This Patch expose dirty block tracking per
device to be polled from upper layer.

Changes from v4:
- Register dirty tracking for each block device....

e900a7b7 09/11/2009 06:19 pm Christoph Hellwig

block: add enable_write_cache flag

Add a enable_write_cache flag in the block driver state, and use it to
decide if we claim to have a volatile write cache that needs controlled
flushing from the guest. The flag is off if cache=writethrough is
defined because O_DSYNC guarantees that every write goes to stable...

b2e12bc6 09/11/2009 06:19 pm Christoph Hellwig

block: add aio_flush operation

Instead stalling the VCPU while serving a cache flush try to do it
asynchronously. Use our good old helper thread pool to issue an
asynchronous fdatasync for raw-posix. Note that while Linux AIO
implements a fdatasync operation it is not useful for us because...

40b4f539 09/11/2009 06:18 pm Kevin Wolf

Add bdrv_aio_multiwrite

One performance problem of qcow2 during the initial image growth are
sequential writes that are not cluster aligned. In this case, when a first
requests requires to allocate a new cluster but writes only to the first
couple of sectors in that cluster, the rest of the cluster is zeroed - just...

a35e1c17 08/28/2009 04:30 am Kevin Wolf

qcow2: Metadata preallocation

This introduces a qemu-img create option for qcow2 which allows the metadata to
be preallocated, i.e. clusters are reserved in the refcount table and L1/L2
tables, but no data is written to them. Metadata is quite small, so this...

45566e9c 07/16/2009 04:28 pm Christoph Hellwig

replace bdrv_{get, put}_buffer with bdrv_{load, save}_vmstate

The VM state offset is a concept internal to the image format. Replace
the old bdrv_{get,put}_buffer method that require an index into the
image file that is constructed from the VM state offset and an offset...

508c7cb3 06/15/2009 03:04 pm Christoph Hellwig

block: add bdrv_probe_device method

Add a bdrv_probe_device method to all BlockDriver instances implementing
host devices to move matching of host device types into the actual drivers.
For now we keep exacly the old matching behaviour based on the devices names,...

c16b5a2c 05/27/2009 05:46 pm Christoph Hellwig

fully split aio_pool from BlockDriver

Now that we have a separate aio pool structure we can remove those
aio pool details from BlockDriver.

Every driver supporting AIO now needs to declare a static AIOPool
with the aiocb size and the cancellation method. This cleans up the...

73c632ed 05/22/2009 06:50 pm Kevin Wolf

qcow2: Allow different cluster sizes

Add an option to specify the cluster size of a newly created qcow2 image.
Default is 4k which is the same value that was hard-coded before.

Signed-off-by: Kevin Wolf <>
Signed-off-by: Anthony Liguori <>

0e7e1989 05/22/2009 06:50 pm Kevin Wolf

Convert all block drivers to new bdrv_create

Now we can make use of the newly introduced option structures. Instead of
having bdrv_create carry more and more parameters (which are format specific in
most cases), just pass a option structure as defined by the driver itself....

e268ca52 04/22/2009 11:20 pm aliguori

implement qemu_blockalign (Stefano Stabellini)

this patch adds a buffer_alignment field to BlockDriverState and
implements a qemu_blockalign function that uses that field to allocate a
memory aligned buffer to be used by the block driver.
buffer_alignment is initialized to 512 but each block driver can set...

e97fc193 04/22/2009 02:11 am aliguori

Introduce bdrv_check (Kevin Wolf)

From: Kevin Wolf <>

Introduce a new bdrv_check function pointer for block drivers. Modify qcow2 to
return an error status in check_refcounts(), so it can implement bdrv_check.

Signed-off-by: Kevin Wolf <>...

f141eafe 04/07/2009 09:43 pm aliguori

push down vector linearization to posix-aio-compat.c (Christoph Hellwig)

Make all AIO requests vectored and defer linearization until the actual
I/O thread. This prepares for using native preadv/pwritev.

Also enables asynchronous direct I/O by handling that case in the I/O thread....

178e08a5 04/05/2009 10:10 pm aliguori

Fix savevm after BDRV_FILE size enforcement

We now enforce that you cannot write beyond the end of a non-growable file.
qcow2 files are not growable but we rely on them being growable to do
savevm/loadvm. Temporarily allow them to be growable by introducing a new...

5eb45639 03/28/2009 07:55 pm aliguori

block: support known backing format for image create and open (Uri Lublin)

Added a backing_format field to BlockDriverState.
Added bdrv_create2 and drv->bdrv_create2 to create an image with
a known backing file format.
Upon bdrv_open2 if backing format is known use it, instead of...

221f715d 03/28/2009 07:28 pm aliguori

new scsi-generic abstraction, use SG_IO (Christoph Hellwig)

Okay, I started looking into how to handle scsi-generic I/O in the
new world order.

I think the best is to use the SG_IO ioctl instead of the read/write
interface as that allows us to support scsi passthrough on disk/cdrom...

6bbff9a0 03/20/2009 08:25 pm aliguori

Refactor aio callback allocation to use an aiocb pool (Avi Kivity)

Move the AIOCB allocation code to use a dedicate structure, AIOPool. AIOCB
specific information, such as the AIOCB size and cancellation routine, is
moved into the pool.

At present, there is exactly one pool per block format driver, maintaining...

eda578e5 03/12/2009 09:57 pm aliguori

Drop internal bdrv_pread()/bdrv_pwrite() APIs (Avi Kivity)

Now that scsi generic no longer uses bdrv_pread() and bdrv_pwrite(), we can
drop the corresponding internal APIs, which overlap bdrv_read()/bdrv_write()
and, being byte oriented, are unnatural for a block device....

04eeb8b6 03/12/2009 09:57 pm aliguori

Add internal scsi generic block API (Avi Kivity)

Add an internal API for the generic block layer to send scsi generic commands
to block format driver. This means block format drivers no longer need
to consider overloaded nb_sectors parameters.

Signed-off-by: Avi Kivity <>...

c0f4ce77 03/06/2009 01:01 am aliguori

monitor: Rework early disk password inquiry (Jan Kiszka)

Reading the passwords for encrypted hard disks during early startup is
broken (I guess for quiet a while now):
- No monitor terminal is ready for input at this point
- Forcing all mux'ed terminals into monitor mode can confuse other...

71d0770c 03/03/2009 07:37 pm aliguori

Fix CVE-2008-0928 - insufficient block device address range checking (Anthony Liguori)

Introduce a growable flag that's set by bdrv_file_open(). Block devices should
never be growable, only files that are being used by block devices.

I went through Fabrice's early comments about the patch that was first applied....

b0a7b120 02/11/2009 05:20 pm aliguori

qemu: record devfn on block driver instance (Marcelo Tosatti)

Record PCIDev on the BlockDriverState structure to locate for release
on hot-removal.

Signed-off-by: Marcelo Tosatti <>
Signed-off-by: Anthony Liguori <>...

4fc9af53 11/08/2008 06:27 pm aliguori

Use an option rom instead of boot sector for -kernel

Generate an option rom instead of using a hijacked boot sector for kernel
booting. This just requires adding a small option ROM header and a few more
instructions to the boot sector to take over the int19 vector and run our...

7ee930d0 09/17/2008 10:04 pm blueswir1

Fix warnings that would be caused by ld flag --warn-common

git-svn-id: svn:// c046a42c-6fe2-441c-8c8c-71466251a162

b5eff355 03/12/2008 01:30 am aurel32

Revert fix for CVE-2008-0928. Will be fixed in a different way later.

git-svn-id: svn:// c046a42c-6fe2-441c-8c8c-71466251a162

902b27d0 03/11/2008 07:17 pm aurel32

Fix CVE-2008-0928 - insufficient block device address range checking

Qemu 0.9.1 and earlier does not perform range checks for block device
read or write requests, which allows guest host users with root
privileges to access arbitrary memory and escape the virtual machine....

985a03b0 12/24/2007 06:10 pm ths

Real SCSI device passthrough (v4), by Laurent Vivier.

git-svn-id: svn:// c046a42c-6fe2-441c-8c8c-71466251a162

a36e69dd 12/02/2007 07:18 am ths

Collecting block device statistics, by Richard W.M. Jones.

git-svn-id: svn:// c046a42c-6fe2-441c-8c8c-71466251a162

faf07963 11/11/2007 04:51 am pbrook

Split block API from vl.h.
Remove QEMU_TOOL. Replace with QEMU_IMG and NEED_CPU_H.
Avoid linking qemu-img against whole system emulatior.

git-svn-id: svn:// c046a42c-6fe2-441c-8c8c-71466251a162

3b46e624 09/17/2007 11:09 am ths

find -type f | xargs sed -i 's/[\t ]*$//g' # Yes, again. Note the star in the regex.

git-svn-id: svn:// c046a42c-6fe2-441c-8c8c-71466251a162

ec36ba14 09/17/2007 12:59 am ths

vmdk compatibility level 6 images, by Soren Hansen.

git-svn-id: svn:// c046a42c-6fe2-441c-8c8c-71466251a162

5fafdf24 09/17/2007 12:08 am ths

find -type f | xargs sed -i 's/[\t ]$//g' # on most files

git-svn-id: svn:// c046a42c-6fe2-441c-8c8c-71466251a162

19cb3738 08/19/2006 02:45 pm bellard

better support of host drives

git-svn-id: svn:// c046a42c-6fe2-441c-8c8c-71466251a162

ce1a14dc 08/07/2006 05:38 am pbrook

Dynamically allocate AIO Completion Blocks.

git-svn-id: svn:// c046a42c-6fe2-441c-8c8c-71466251a162

d15a771d 08/06/2006 04:35 pm bellard

qcow2 is now used for '-snapshot' - keep BlockDriverState.total_sectors

git-svn-id: svn:// c046a42c-6fe2-441c-8c8c-71466251a162

faea38e7 08/06/2006 12:31 am bellard

multiple snapshot support

git-svn-id: svn:// c046a42c-6fe2-441c-8c8c-71466251a162

83f64091 08/01/2006 07:21 pm bellard

async file I/O API

git-svn-id: svn:// c046a42c-6fe2-441c-8c8c-71466251a162

7a6cba61 06/04/2006 02:39 pm pbrook

Disk cache flush support.

git-svn-id: svn:// c046a42c-6fe2-441c-8c8c-71466251a162

95389c86 12/18/2005 08:28 pm bellard

qcow_make_empty() support (Johannes Schindelin)

git-svn-id: svn:// c046a42c-6fe2-441c-8c8c-71466251a162

46d4767d 11/16/2004 03:45 am bellard

better BIOS ATA translation support

git-svn-id: svn:// c046a42c-6fe2-441c-8c8c-71466251a162

e2731add 09/18/2004 10:32 pm bellard

fixed block close() method prototype

git-svn-id: svn:// c046a42c-6fe2-441c-8c8c-71466251a162

ea2384d3 08/02/2004 12:59 am bellard

new disk image layer

git-svn-id: svn:// c046a42c-6fe2-441c-8c8c-71466251a162