[PULL,13/30] vmdk: Don't update L2 table for zero write on zero cluster
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Message ID 20200508124135.252565-14-kwolf@redhat.com
State New
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Series
  • [PULL,01/30] iotests: handle tmpfs
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Commit Message

Kevin Wolf May 8, 2020, 12:41 p.m. UTC
If a cluster is already zeroed, we don't have to call vmdk_L2update(),
which is rather slow because it flushes the image file.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20200430133007.170335-5-kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/vmdk.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch
diff mbox series

diff --git a/block/vmdk.c b/block/vmdk.c
index ab8eec1f27..2880d88dea 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -2013,7 +2013,7 @@  static int vmdk_pwritev(BlockDriverState *bs, uint64_t offset,
                     offset_in_cluster == 0 &&
                     n_bytes >= extent->cluster_sectors * BDRV_SECTOR_SIZE) {
                 n_bytes = extent->cluster_sectors * BDRV_SECTOR_SIZE;
-                if (!zero_dry_run) {
+                if (!zero_dry_run && ret != VMDK_ZEROED) {
                     /* update L2 tables */
                     if (vmdk_L2update(extent, &m_data, VMDK_GTE_ZEROED)
                             != VMDK_OK) {