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# Date Author Comment
c25f53b0 01/24/2014 06:40 pm Paolo Bonzini

raw: Probe required direct I/O alignment

Add a bs->request_alignment field that contains the required
offset/length alignment for I/O requests and fill it in the raw block
drivers. Use ioctls if possible, else see what alignment it takes for
O_DIRECT to succeed....
793ed47a 01/24/2014 06:40 pm Kevin Wolf

block: Switch BdrvTrackedRequest to byte granularity

Signed-off-by: Kevin Wolf <>
Reviewed-by: Max Reitz <>
Reviewed-by: Benoit Canet <>
d34682cd 01/24/2014 06:40 pm Kevin Wolf

block: Move initialisation of BlockLimits to bdrv_refresh_limits()

This function separates filling the BlockLimits from bdrv_open(), which
allows it to call it from other operations which may change the limits
(e.g. modifications to the backing file chain or bdrv_reopen)...
339064d5 01/24/2014 06:40 pm Kevin Wolf

block: Don't use guest sector size for qemu_blockalign()

bs->buffer_alignment is set by the device emulation and contains the
logical block size of the guest device. This isn't something that the
block layer should know, and even less something to use for determining...
1b7fd729 01/24/2014 06:40 pm Paolo Bonzini

block: rename buffer_alignment to guest_block_size

The alignment field is now set to the value that is promised to the
guest, rather than required by the host. The next patches will make
QEMU aware of the host-provided values, so make this clear.

The alignment is also not about memory buffers, but about the sectors on...
212a5a8f 01/24/2014 05:07 pm Benoît Canet

block: Create authorizations mechanism for external snapshot and resize.

Signed-off-by: Benoit Canet <>
Signed-off-by: Kevin Wolf <>
dc364f4c 01/24/2014 03:33 pm Benoît Canet

block: Add bs->node_name to hold the name of a bs node of the bs graph.

Add the minimum of code to prepare for the following patches.

Signed-off-by: Benoit Canet <>
Reviewed-by: Fam Zheng <>
Signed-off-by: Kevin Wolf <>
03544a6e 12/20/2013 05:26 pm Fam Zheng

block: Add commit_active_start()

commit_active_start is implemented in block/mirror.c, It will create a
job with "commit" type and designated base in block-commit command. This
will be used for committing active layer of device.

Sync mode is removed from MirrorBlockJob because there's no proper type...
7337acaf 12/05/2013 12:45 pm Peter Lieven

block: add opt_transfer_length to BlockLimits

Reviewed-by: Paolo Bonzini <>
Signed-off-by: Peter Lieven <>
Signed-off-by: Stefan Hajnoczi <>
7b4c4781 12/04/2013 04:19 pm Wenchao Xia

snapshot: distinguish id and name in load_tmp

Since later this function will be used so improve it. The only caller of it
now is qemu-img, and it is not impacted by introduce function
bdrv_snapshot_load_tmp_by_id_or_name() that call bdrv_snapshot_load_tmp()...
b3af018f 11/29/2013 02:40 pm Liu Yuan

sheepdog: support user-defined redundancy option

Sheepdog support two kinds of redundancy, full replication and erasure coding.

  1. create a fully replicated vdi with x copies
    -o redundancy=x (1 <= x <= SD_MAX_COPIES)
  1. create a erasure coded vdi with x data strips and y parity strips...
4cc70e93 11/29/2013 02:40 pm Fam Zheng

blkdebug: add "remove_break" command

This adds "remove_break" command which is the reverse of blkdebug
command "break": it removes all breakpoints with given tag and resumes
all the requests.

Signed-off-by: Fam Zheng <>
Signed-off-by: Stefan Hajnoczi <>
e4654d2d 11/29/2013 02:40 pm Fam Zheng

block: per caller dirty bitmap

Previously a BlockDriverState has only one dirty bitmap, so only one
caller (e.g. a block job) can keep track of writing. This changes the
dirty bitmap to a list and creates a BdrvDirtyBitmap for each caller, the
lifecycle is managed with these new functions:...
aa7bfbff 11/28/2013 11:30 am Peter Lieven

block: add flags to bdrv_*_write_zeroes

Reviewed-by: Eric Blake <>
Signed-off-by: Peter Lieven <>
Signed-off-by: Stefan Hajnoczi <>
fe81c2cc 11/28/2013 11:30 am Peter Lieven

block: add BlockLimits structure to BlockDriverState

this patch adds BlockLimits which introduces discard and write_zeroes
limits and alignment information to the BlockDriverState.

Signed-off-by: Peter Lieven <>
Signed-off-by: Stefan Hajnoczi <>
b94a2610 10/29/2013 02:10 pm Kevin Wolf

block: Avoid unecessary drv->bdrv_getlength() calls

The block layer generally keeps the size of an image cached in
bs->total_sectors so that it doesn't have to perform expensive
operations to get the size whenever it needs it.

This doesn't work however when using a backend that can change its size...
f6186f49 10/11/2013 05:49 pm Benoît Canet

block: Add BlockDriver.bdrv_check_ext_snapshot.

This field is used by blkverify to disable external snapshots creation.
It will also be used by block filters like quorum to disable external
snapshot creation.

Signed-off-by: Benoit Canet <>...
eae041fe 10/11/2013 11:52 am Max Reitz

block: Add bdrv_get_specific_info

Add a function for retrieving an ImageInfoSpecific object from a block
driver.

Signed-off-by: Max Reitz <>
Reviewed-by: Eric Blake <>
Signed-off-by: Kevin Wolf <>
030be321 09/25/2013 05:21 pm Benoît Canet

block: introduce BlockDriver.bdrv_needs_filename to enable some drivers.

Some drivers will have driver specifics options but no filename.
This new bool allow the block layer to treat them correctly.

The .bdrv_needs_filename is set in drivers not having .bdrv_parse_filename and...
d5124c00 09/12/2013 11:12 am Max Reitz

bdrv: Use "Error" for creating images

Add an Error ** parameter to BlockDriver.bdrv_create to allow more
specific error messages.

Signed-off-by: Max Reitz <>
a89d89d3 09/12/2013 11:12 am Wenchao Xia

snapshot: distinguish id and name in snapshot delete

Snapshot creation actually already distinguish id and name since it take
a structured parameter *sn, but delete can't. Later an accurate delete
is needed in qmp_transaction abort and blockdev-snapshot-delete-sync,...
015a1036 09/12/2013 11:12 am Max Reitz

bdrv: Use "Error" for opening images

Add an Error ** parameter to BlockDriver.bdrv_open and
BlockDriver.bdrv_file_open to allow more specific error messages.

Signed-off-by: Max Reitz <>
6f176b48 09/12/2013 11:12 am Max Reitz

block: Image file option amendment

This patch adds the "amend" option to qemu-img which allows changing
image options on existing image files. It also adds the generic bdrv
implementation which is basically just a wrapper for the image format
specific function....
b6b8a333 09/06/2013 04:25 pm Paolo Bonzini

block: introduce bdrv_get_block_status API

For now, bdrv_get_block_status is just another name for bdrv_is_allocated.
The next patches will add more flags.

This also touches all block drivers with a mostly mechanical rename. The
sole exception is cow; because it calls cow_co_is_allocated from the read...
9fcb0251 09/06/2013 04:25 pm Fam Zheng

block: implement reference count for BlockDriverState

Introduce bdrv_ref/bdrv_unref to manage the lifecycle of
BlockDriverState. They are unused for now but will used to replace
bdrv_delete() later.

Signed-off-by: Fam Zheng <>
Signed-off-by: Stefan Hajnoczi <>
cc0681c4 09/06/2013 04:25 pm Benoît Canet

block: Enable the new throttling code in the block layer.

Signed-off-by: Benoit Canet <>
Signed-off-by: Stefan Hajnoczi <>
6a1751b7 08/22/2013 08:10 pm Alex Bligh

aio / timers: Untangle include files

include/qemu/timer.h has no need to include main-loop.h and
doing so causes an issue for the next patch. Unfortunately
various files assume including timers.h will pull in main-loop.h.
Untangle this mess.

Signed-off-by: Alex Bligh <>...
0d51b4de 08/22/2013 03:10 pm Asias He

block: Introduce bs->zero_beyond_eof

In 4146b46c42e0989cb5842e04d88ab6ccb1713a48 (block: Produce zeros when
protocols reading beyond end of file), we break qemu-iotests ./check
-qcow2 022. This happens because qcow2 temporarily sets ->growable = 1
for vmstate accesses (which are stored beyond the end of regular image...
fc5d3f84 07/26/2013 11:01 pm Ian Main

Implement sync modes for drive-backup.

This patch adds sync-modes to the drive-backup interface and
implements the FULL, NONE and TOP modes of synchronization.

FULL performs as before copying the entire contents of the drive
while preserving the point-in-time using CoW....
d616b224 06/28/2013 10:20 am Stefan Hajnoczi

block: add bdrv_add_before_write_notifier()

The bdrv_add_before_write_notifier() function installs a callback that
is invoked before a write request is processed. This will be used to
implement copy-on-write point-in-time snapshots where we need to copy...
98d2c6f2 06/28/2013 10:20 am Dietmar Maurer

block: add basic backup support to block driver

backup_start() creates a block job that copies a point-in-time snapshot
of a block device to a target block device.

We call backup_do_cow() for each write during backup. That function
reads the original data from the block device before it gets...
f364ec65 06/04/2013 02:56 pm Wenchao Xia

block: move qmp and info dump related code to block/qapi.c

This patch is a pure code move patch, except following modification:
1 get_human_readable_size() is changed to static function.
2 dump_human_image_info() is renamed to bdrv_image_info_dump().
3 in qmp_query_block() and qmp_query_blockstats, use bdrv_next(bs)...
56d1b4d2 04/22/2013 12:34 pm Kevin Wolf

block: Remove filename parameter from .bdrv_file_open()

It is unused now in all block drivers.

Signed-off-by: Kevin Wolf <>
Reviewed-by: Eric Blake <>
cf8074b3 04/15/2013 09:26 am Kevin Wolf

block: Introduce bdrv_writev_vmstate

Signed-off-by: Kevin Wolf <>
Signed-off-by: Stefan Hajnoczi <>
5905fbc9 04/05/2013 07:58 pm Stefan Hajnoczi

block: fix I/O throttling accounting blind spot

I/O throttling relies on bdrv_acct_done() which is called when a request
completes. This leaves a blind spot since we only charge for completed
requests, not submitted requests.

For example, if there is 1 operation remaining in this time slice the...
ae29d6c6 04/05/2013 07:58 pm Stefan Hajnoczi

block: keep I/O throttling slice time constant

It is not necessary to adjust the slice time at runtime. We already
extend the current slice in order to carry over accounting into the next
slice. Changing the actual slice time value introduces oscillations....
6963a30d 03/22/2013 06:51 pm Kevin Wolf

block: Introduce .bdrv_parse_filename callback

If a driver needs structured data and not just a string, it can provide
a .bdrv_parse_filename callback now that parses the command line string
into separate options. Keeping this separate from .bdrv_open_filename...
c2ad1b0c 03/22/2013 06:51 pm Kevin Wolf

block: Allow omitting the file name when using driver-specific options

After this patch, using -drive with an empty file name continues to open
the file if driver-specific options are used. If no driver-specific
options are specified, the semantics stay as it was: It defines a drive...
787e4a85 03/22/2013 06:51 pm Kevin Wolf

block: Add options QDict to bdrv_file_open() prototypes

The new parameter is unused yet.

Signed-off-by: Kevin Wolf <>
Reviewed-by: Eric Blake <>
85d126f3 03/15/2013 05:07 pm Stefan Hajnoczi

block: add bdrv_get_aio_context()

For now bdrv_get_aio_context() is just a stub that calls
qemu_aio_get_context() since the block layer is currently tied to the
main loop AioContext.

Add the stub now so that the block layer can begin accessing its
AioContext....
1a86938f 03/15/2013 05:07 pm Kevin Wolf

block: Add options QDict to .bdrv_open()

Signed-off-by: Kevin Wolf <>
Reviewed-by: Eric Blake <>
Reviewed-by: Stefan Hajnoczi <>
Signed-off-by: Stefan Hajnoczi <>
de9c0cec 03/15/2013 05:07 pm Kevin Wolf

block: Add options QDict to bdrv_open() prototype

It doesn't do anything yet except storing the options QDict in the
BlockDriverState.

Signed-off-by: Kevin Wolf <>
Reviewed-by: Eric Blake <>
Reviewed-by: Stefan Hajnoczi <>...
7f2039f6 02/01/2013 03:58 pm Othmar Pasteka

vmdk: Allow selecting SCSI adapter in image creation

Introduce a new option "adapter_type" when converting to vmdk images.
It can be one of the following: ide (default), buslogic, lsilogic
or legacyESX (according to the vmdk spec from vmware).

In case of a non-ide adapter, heads is set to 255 instead of the 16....
eee13dfe 01/25/2013 07:18 pm Paolo Bonzini

mirror: allow customizing the granularity

The desired granularity may be very different depending on the kind of
operation (e.g. continuous replication vs. collapse-to-raw) and whether
the VM is expected to perform lots of I/O while mirroring is in progress....
08e4ed6c 01/25/2013 07:18 pm Paolo Bonzini

mirror: add buf-size argument to drive-mirror

This makes sense when the next commit starts using the extra buffer space
to perform many I/O operations asynchronously.

Signed-off-by: Paolo Bonzini <>
Signed-off-by: Kevin Wolf <>
8f0720ec 01/25/2013 07:18 pm Paolo Bonzini

block: implement dirty bitmap using HBitmap

This actually uses the dirty bitmap in the block layer, and converts
mirroring to use an HBitmapIter.

Reviewed-by: Laszlo Ersek <> (except block/mirror.c parts)
Reviewed-by: Eric Blake <>...
1de7afc9 12/19/2012 09:32 am Paolo Bonzini

misc: move include files to include/qemu/

Signed-off-by: Paolo Bonzini <>
83c9089e 12/19/2012 09:31 am Paolo Bonzini

monitor: move include files to include/monitor/

Signed-off-by: Paolo Bonzini <>
737e150e 12/19/2012 09:31 am Paolo Bonzini

block: move include files to include/block/

Signed-off-by: Paolo Bonzini <>