* [Qemu-devel] [PATCH] vpc: Implement .bdrv_has_zero_init
@ 2013-06-28 8:23 Kevin Wolf
0 siblings, 0 replies; only message in thread
From: Kevin Wolf @ 2013-06-28 8:23 UTC (permalink / raw)
To: qemu-devel; +Cc: kwolf, pl
Depending on the subformat, has_zero_init on VHD must behave like raw
and query the underlying storage (fixed) or like other sparse formats
that can always return 1 (dynamic, differencing).
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
block/vpc.c | 25 +++++++++++++++++++------
1 file changed, 19 insertions(+), 6 deletions(-)
diff --git a/block/vpc.c b/block/vpc.c
index 3cad52e..fe4f311 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -786,6 +786,18 @@ static int vpc_create(const char *filename, QEMUOptionParameter *options)
return ret;
}
+static int vpc_has_zero_init(BlockDriverState *bs)
+{
+ BDRVVPCState *s = bs->opaque;
+ struct vhd_footer *footer = (struct vhd_footer *) s->footer_buf;
+
+ if (cpu_to_be32(footer->type) == VHD_FIXED) {
+ return bdrv_has_zero_init(bs->file);
+ } else {
+ return 1;
+ }
+}
+
static void vpc_close(BlockDriverState *bs)
{
BDRVVPCState *s = bs->opaque;
@@ -818,16 +830,17 @@ static BlockDriver bdrv_vpc = {
.format_name = "vpc",
.instance_size = sizeof(BDRVVPCState),
- .bdrv_probe = vpc_probe,
- .bdrv_open = vpc_open,
- .bdrv_close = vpc_close,
- .bdrv_reopen_prepare = vpc_reopen_prepare,
- .bdrv_create = vpc_create,
+ .bdrv_probe = vpc_probe,
+ .bdrv_open = vpc_open,
+ .bdrv_close = vpc_close,
+ .bdrv_reopen_prepare = vpc_reopen_prepare,
+ .bdrv_create = vpc_create,
.bdrv_read = vpc_co_read,
.bdrv_write = vpc_co_write,
- .create_options = vpc_create_options,
+ .create_options = vpc_create_options,
+ .bdrv_has_zero_init = vpc_has_zero_init,
};
static void bdrv_vpc_init(void)
--
1.8.1.4
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2013-06-28 8:23 [Qemu-devel] [PATCH] vpc: Implement .bdrv_has_zero_init Kevin Wolf
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