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[Qemu-devel] [PATCH V3 6/7] qcow2: print message for error path in snaps
From: |
Wenchao Xia |
Subject: |
[Qemu-devel] [PATCH V3 6/7] qcow2: print message for error path in snapshot creation |
Date: |
Mon, 9 Sep 2013 10:58:01 +0800 |
The message will be print out with a macro enabled, which can
be used to check which error path is taken.
Signed-off-by: Wenchao Xia <address@hidden>
---
block/qcow2-snapshot.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 46 insertions(+), 0 deletions(-)
diff --git a/block/qcow2-snapshot.c b/block/qcow2-snapshot.c
index 92b87f8..7f24486 100644
--- a/block/qcow2-snapshot.c
+++ b/block/qcow2-snapshot.c
@@ -26,6 +26,8 @@
#include "block/block_int.h"
#include "block/qcow2.h"
+/* #define QCOW2_SNAPSHOT_PRINT_ERROR_PATH */
+
typedef struct QEMU_PACKED QCowSnapshotHeader {
/* header is 8 byte aligned */
uint64_t l1_table_offset;
@@ -182,10 +184,16 @@ static int qcow2_write_snapshots(BlockDriverState *bs)
snapshots_offset = qcow2_alloc_clusters(bs, snapshots_size);
offset = snapshots_offset;
if (offset < 0) {
+#ifdef QCOW2_SNAPSHOT_PRINT_ERROR_PATH
+ printf("qcow2: Failed in allocation of snapshot list\n");
+#endif
return offset;
}
ret = bdrv_flush(bs);
if (ret < 0) {
+#ifdef QCOW2_SNAPSHOT_PRINT_ERROR_PATH
+ printf("qcow2: Failed in flush after snapshot list allocation\n");
+#endif
goto fail;
}
@@ -194,6 +202,9 @@ static int qcow2_write_snapshots(BlockDriverState *bs)
ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT, offset,
s->snapshots_size);
if (ret < 0) {
+#ifdef QCOW2_SNAPSHOT_PRINT_ERROR_PATH
+ printf("qcow2: Failed in overlap check before update snapshot list\n");
+#endif
goto fail;
}
@@ -227,24 +238,36 @@ static int qcow2_write_snapshots(BlockDriverState *bs)
ret = bdrv_pwrite(bs->file, offset, &h, sizeof(h));
if (ret < 0) {
+#ifdef QCOW2_SNAPSHOT_PRINT_ERROR_PATH
+ printf("qcow2: Failed in update of snapshot header\n");
+#endif
goto fail;
}
offset += sizeof(h);
ret = bdrv_pwrite(bs->file, offset, &extra, sizeof(extra));
if (ret < 0) {
+#ifdef QCOW2_SNAPSHOT_PRINT_ERROR_PATH
+ printf("qcow2: Failed in update of extra snapshot info\n");
+#endif
goto fail;
}
offset += sizeof(extra);
ret = bdrv_pwrite(bs->file, offset, sn->id_str, id_str_size);
if (ret < 0) {
+#ifdef QCOW2_SNAPSHOT_PRINT_ERROR_PATH
+ printf("qcow2: Failed in update of snapshot id\n");
+#endif
goto fail;
}
offset += id_str_size;
ret = bdrv_pwrite(bs->file, offset, sn->name, name_size);
if (ret < 0) {
+#ifdef QCOW2_SNAPSHOT_PRINT_ERROR_PATH
+ printf("qcow2: Failed in update of snapshot name\n");
+#endif
goto fail;
}
offset += name_size;
@@ -256,6 +279,9 @@ static int qcow2_write_snapshots(BlockDriverState *bs)
*/
ret = bdrv_flush(bs);
if (ret < 0) {
+#ifdef QCOW2_SNAPSHOT_PRINT_ERROR_PATH
+ printf("qcow2: Failed in flush after update snapshot list\n");
+#endif
goto fail;
}
@@ -269,6 +295,9 @@ static int qcow2_write_snapshots(BlockDriverState *bs)
ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, nb_snapshots),
&header_data, sizeof(header_data));
if (ret < 0) {
+#ifdef QCOW2_SNAPSHOT_PRINT_ERROR_PATH
+ printf("qcow2: Failed in update qcow2 header in snapshot creation\n");
+#endif
goto fail;
}
@@ -366,6 +395,9 @@ int qcow2_snapshot_create(BlockDriverState *bs,
QEMUSnapshotInfo *sn_info)
l1_table_offset = qcow2_alloc_clusters(bs, s->l1_size * sizeof(uint64_t));
if (l1_table_offset < 0) {
ret = l1_table_offset;
+#ifdef QCOW2_SNAPSHOT_PRINT_ERROR_PATH
+ printf("qcow2: Failed in allocation of L1 table for snapshot\n");
+#endif
goto fail;
}
@@ -381,12 +413,20 @@ int qcow2_snapshot_create(BlockDriverState *bs,
QEMUSnapshotInfo *sn_info)
ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT,
sn->l1_table_offset, s->l1_size * sizeof(uint64_t));
if (ret < 0) {
+#ifdef QCOW2_SNAPSHOT_PRINT_ERROR_PATH
+ printf("qcow2: Failed in overlap check before update L1 table for "
+ "snapshot\n");
+#endif
goto dealloc_cluster;
}
+ BLKDBG_EVENT(bs->file, BLKDBG_SNAPSHOT_L1_UPDATE);
ret = bdrv_pwrite(bs->file, sn->l1_table_offset, l1_table,
s->l1_size * sizeof(uint64_t));
if (ret < 0) {
+#ifdef QCOW2_SNAPSHOT_PRINT_ERROR_PATH
+ printf("qcow2: Failed in update of L1 table for snapshot\n");
+#endif
goto dealloc_cluster;
}
@@ -400,6 +440,9 @@ int qcow2_snapshot_create(BlockDriverState *bs,
QEMUSnapshotInfo *sn_info)
*/
ret = qcow2_update_snapshot_refcount(bs, s->l1_table_offset, s->l1_size,
1);
if (ret < 0) {
+#ifdef QCOW2_SNAPSHOT_PRINT_ERROR_PATH
+ printf("qcow2: Failed in update refcount for snapshot\n");
+#endif
goto dealloc_cluster;
}
@@ -419,6 +462,9 @@ int qcow2_snapshot_create(BlockDriverState *bs,
QEMUSnapshotInfo *sn_info)
g_free(s->snapshots);
s->snapshots = old_snapshot_list;
s->nb_snapshots = old_snapshot_num;
+#ifdef QCOW2_SNAPSHOT_PRINT_ERROR_PATH
+ printf("qcow2: Failed in update of snapshot list and header\n");
+#endif
goto restore_refcount;
}
--
1.7.1
- [Qemu-devel] [PATCH V3 0/7] qcow2: rollback the modification on fail in snapshot creation, Wenchao Xia, 2013/09/08
- [Qemu-devel] [PATCH V3 3/7] qcow2: cancel the modification on fail in qcow2_snapshot_create(), Wenchao Xia, 2013/09/08
- [Qemu-devel] [PATCH V3 2/7] qcow2: free allocated cluster on fail in qcow2_write_snapshots(), Wenchao Xia, 2013/09/08
- [Qemu-devel] [PATCH V3 6/7] qcow2: print message for error path in snapshot creation,
Wenchao Xia <=
- [Qemu-devel] [PATCH V3 1/7] qcow2: restore nb_snapshots when fail in snapshot creation, Wenchao Xia, 2013/09/08
- [Qemu-devel] [PATCH V3 4/7] blkdebug: add debug events for snapshot, Wenchao Xia, 2013/09/08
- [Qemu-devel] [PATCH V3 7/7] qemu-iotests: add test for qcow2 snapshot, Wenchao Xia, 2013/09/08
- [Qemu-devel] [PATCH V3 5/7] qcow2: use debug events for snapshot, Wenchao Xia, 2013/09/08
- Re: [Qemu-devel] [PATCH V3 0/7] qcow2: rollback the modification on fail in snapshot creation, Wenchao Xia, 2013/09/23