[Sheepdog] [PATCH 5/5] sheepdog: support specifying snapshot name in creating snapshot

[MORITA Kazutaka]

usage:

  $ qemu-img snapshot -f sheepdog -c [tag name] [vdi name]

Currently, the tag name must be a hex number. If you specify a non
number, an auto-generated number will be used.

Signed-off-by: MORITA Kazutaka <morita.kazutaka at lab.ntt.co.jp>
---
 block/sheepdog.c |   13 ++++++++++---
 1 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/block/sheepdog.c b/block/sheepdog.c
index 72c1ee4..701c0d8 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -1946,8 +1946,15 @@ static int sd_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
 	struct bdrv_sd_state *s = bs->opaque;
 	int ret;
 	struct timeval tv;
-
-	gettimeofday(&tv, NULL);
+	uint64_t tag = 0;
+
+	tag = strtoull(sn_info->name, NULL, 16);
+	if (tag == 0) {
+		eprintf("currently, only a hex number is supported as a tag name\n");
+		eprintf("use a generated number\n");
+		gettimeofday(&tv, NULL);
+		tag = tv.tv_sec;
+	}
 
 	dprintf("%s %s %s %d %d\n", sn_info->name, sn_info->id_str,
 		s->name, sn_info->vm_state_size, s->is_current);
@@ -1963,7 +1970,7 @@ static int sd_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
 	dprintf("%s %s\n", sn_info->name, sn_info->id_str);
 
 	ret = do_sd_create(s->name, s->inode.vdi_size >> 9,
-			   s->inode.oid, NULL, tv.tv_sec, 0);
+			   s->inode.oid, NULL, tag, 0);
 
 	return ret;
 }
-- 
1.5.6.5