[Qemu-devel] [PATCH V3 5/7] qcow2: use debug events for snapshot

[Wenchao Xia <xiawenc@linux.vnet.ibm.com>]

For those error paths which can't be triggered by other debug event,
use snapshot debug events.

Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
---
 block/qcow2-snapshot.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/block/qcow2-snapshot.c b/block/qcow2-snapshot.c
index e0b7a5a..92b87f8 100644
--- a/block/qcow2-snapshot.c
+++ b/block/qcow2-snapshot.c
@@ -198,6 +198,7 @@ static int qcow2_write_snapshots(BlockDriverState *bs)
     }
 
 
+    BLKDBG_EVENT(bs->file, BLKDBG_SNAPSHOT_LIST_UPDATE);
     /* Write all snapshots to the new list */
     for(i = 0; i < s->nb_snapshots; i++) {
         sn = s->snapshots + i;
@@ -264,6 +265,7 @@ static int qcow2_write_snapshots(BlockDriverState *bs)
     header_data.nb_snapshots        = cpu_to_be32(s->nb_snapshots);
     header_data.snapshots_offset    = cpu_to_be64(snapshots_offset);
 
+    BLKDBG_EVENT(bs->file, BLKDBG_SNAPSHOT_HEADER_UPDATE);
     ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, nb_snapshots),
                            &header_data, sizeof(header_data));
     if (ret < 0) {
@@ -375,6 +377,7 @@ int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
         l1_table[i] = cpu_to_be64(s->l1_table[i]);
     }
 
+    BLKDBG_EVENT(bs->file, BLKDBG_SNAPSHOT_L1_UPDATE);
     ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT,
             sn->l1_table_offset, s->l1_size * sizeof(uint64_t));
     if (ret < 0) {
-- 
1.7.1