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[Qemu-devel] [PATCH v3 2/4] vmdk: Implement .bdrv_write_compressed
From: |
Fam Zheng |
Subject: |
[Qemu-devel] [PATCH v3 2/4] vmdk: Implement .bdrv_write_compressed |
Date: |
Fri, 25 Apr 2014 16:00:50 +0800 |
Add a wrapper function to support "compressed" path in qemu-img convert.
Only support streamOptimized subformat case for now (num_extents == 1
and extent compression is true).
Signed-off-by: Fam Zheng <address@hidden>
---
block/vmdk.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/block/vmdk.c b/block/vmdk.c
index b69988d..ced914b 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -1495,6 +1495,19 @@ static coroutine_fn int vmdk_co_write(BlockDriverState
*bs, int64_t sector_num,
return ret;
}
+static int vmdk_write_compressed(BlockDriverState *bs,
+ int64_t sector_num,
+ const uint8_t *buf,
+ int nb_sectors)
+{
+ BDRVVmdkState *s = bs->opaque;
+ if (s->num_extents == 1 && s->extents[0].compressed) {
+ return vmdk_write(bs, sector_num, buf, nb_sectors, false, false);
+ } else {
+ return -ENOTSUP;
+ }
+}
+
static int coroutine_fn vmdk_co_write_zeroes(BlockDriverState *bs,
int64_t sector_num,
int nb_sectors,
@@ -2108,6 +2121,7 @@ static BlockDriver bdrv_vmdk = {
.bdrv_reopen_prepare = vmdk_reopen_prepare,
.bdrv_read = vmdk_co_read,
.bdrv_write = vmdk_co_write,
+ .bdrv_write_compressed = vmdk_write_compressed,
.bdrv_co_write_zeroes = vmdk_co_write_zeroes,
.bdrv_close = vmdk_close,
.bdrv_create = vmdk_create,
--
1.9.2