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block: Image file option amendment

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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.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2013-09-03 10:09:50 +02:00 • committed by Kevin Wolf
parent 56e023af80
commit 6f176b48f9
6 changed files with 108 additions and 0 deletions
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qemu-img.texi
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@ -350,6 +350,11 @@ sizes accordingly. Failure to do so will result in data loss!
After using this command to grow a disk image, you must use file system and
partitioning tools inside the VM to actually begin using the new space on the
device.
@item amend [-f @var{fmt}] -o @var{options} @var{filename}
Amends the image format specific @var{options} for the image file
@var{filename}. Not all file formats support this operation.
@end table
@c man end