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# Date Author Comment
078a458e 06/22/2010 03:38 pm Kevin Wolf

vpc: Use bdrv_(p)write_sync for metadata writes

Use bdrv_(p)write_sync to ensure metadata integrity in case of a crash.

Signed-off-by: Kevin Wolf <>
6c6ea921 06/15/2010 10:41 am Kevin Wolf

vpc: Read/write multiple sectors at once

This changes the vpc block driver (for VHD) to read/write multiple sectors at
once instead of doing a request for each single sector.

Before this, running qemu-iotests for VPC took ages, now it's actually quite
reasonable to run it always (down from ~1 hour to 40 seconds for me)....
dede4188 05/17/2010 11:20 am Stefan Weil

block/vpc: Fix conversion from size to disk geometry

The VHD algorithm calculates a disk geometry
which is usually smaller than the requested size.

QEMU tried to round up but failed for certain sizes:

qemu-img create -f vpc disk.vpc 9437184
would create an image with 9435136 bytes...
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...
cc2040f8 09/09/2009 10:57 pm Stefan Weil

Fix spelling in comment.

The company which made Virtual PC was Connectix.
They use the magic string "conectix" in their disk images.

Signed-off-by: Stefan Weil <>
Signed-off-by: Anthony Liguori <>
5ec4d682 08/24/2009 04:46 pm Nathan Froyd

eliminate errors about unused results in block/vpc.c

These errors come up when compiling with gcc-4.3.3 and some older headers:

/scratch/froydnj/qemu.git/block/vpc.c: In function 'vpc_create':
/scratch/froydnj/qemu.git/block/vpc.c:514: error: value computed is not used...
db08adf5 06/06/2009 06:38 pm Kevin Wolf

qemu-img: Print available options with -o ?

This patch adds a small help text to each of the options in the block drivers
which can be displayed by using qemu-img create -f fmt -o ?

Signed-off-by: Kevin Wolf <>
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....
019d6b8f 05/15/2009 12:13 am Anthony Liguori

Move block drivers into their own directory

Signed-off-by: Anthony Liguori <>