On 13.09.2013 12:36, Paolo Bonzini wrote:
Il 13/09/2013 12:25, Peter Lieven ha scritto:
if the target has_zero_init = 0, but supports efficiently
writing zeroes by unmapping we call bdrv_zeroize to
avoid fully allocating the target. this currently
is designed especially for iscsi.
Signed-off-by: Peter Lieven <p...@kamp.de>
---
qemu-img.c | 22 ++++++++++++++++------
1 file changed, 16 insertions(+), 6 deletions(-)
diff --git a/qemu-img.c b/qemu-img.c
index 3e5e388..6eaddc6 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -1354,7 +1354,8 @@ static int img_convert(int argc, char **argv)
}
}
- flags = BDRV_O_RDWR;
+ flags = BDRV_O_RDWR | BDRV_O_UNMAP;
I think this should be a new command-line flag.
In an earlier version there where no objections. I think it would
make the usage of qemu-img convert more complicated. For
most targets has_zero_init is 1 anyway.
Peter
