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[Qemu-devel] [PATCH 02/18] block: add error parameter to bdrv_snapshot_c
From: |
Pavel Hrdina |
Subject: |
[Qemu-devel] [PATCH 02/18] block: add error parameter to bdrv_snapshot_create() and related functions |
Date: |
Wed, 15 Aug 2012 09:41:43 +0200 |
Signed-off-by: Pavel Hrdina <address@hidden>
---
block.c | 25 +++++++++++++++++--------
block.h | 3 ++-
block/qcow2-snapshot.c | 9 ++++++++-
block/qcow2.h | 4 +++-
block/rbd.c | 20 ++++++++++++++------
block/sheepdog.c | 17 +++++++++--------
block_int.h | 3 ++-
qemu-img.c | 2 +-
savevm.c | 2 +-
9 files changed, 57 insertions(+), 28 deletions(-)
diff --git a/block.c b/block.c
index 016858b..8bc49b7 100644
--- a/block.c
+++ b/block.c
@@ -2661,16 +2661,25 @@ BlockDriverState *bdrv_snapshots(void)
}
int bdrv_snapshot_create(BlockDriverState *bs,
- QEMUSnapshotInfo *sn_info)
+ QEMUSnapshotInfo *sn_info,
+ Error **errp)
{
BlockDriver *drv = bs->drv;
- if (!drv)
- return -ENOMEDIUM;
- if (drv->bdrv_snapshot_create)
- return drv->bdrv_snapshot_create(bs, sn_info);
- if (bs->file)
- return bdrv_snapshot_create(bs->file, sn_info);
- return -ENOTSUP;
+ int ret;
+
+ if (!drv) {
+ error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, bdrv_get_device_name(bs));
+ ret = -ENOMEDIUM;
+ } else if (drv->bdrv_snapshot_create) {
+ ret = drv->bdrv_snapshot_create(bs, sn_info, errp);
+ } else if (bs->file) {
+ ret = bdrv_snapshot_create(bs->file, sn_info, errp);
+ } else {
+ error_set(errp, QERR_NOT_SUPPORTED);
+ ret = -ENOTSUP;
+ }
+
+ return ret;
}
int bdrv_snapshot_goto(BlockDriverState *bs,
diff --git a/block.h b/block.h
index 2e2be11..92e782b 100644
--- a/block.h
+++ b/block.h
@@ -296,7 +296,8 @@ int bdrv_can_snapshot(BlockDriverState *bs);
int bdrv_is_snapshot(BlockDriverState *bs);
BlockDriverState *bdrv_snapshots(void);
int bdrv_snapshot_create(BlockDriverState *bs,
- QEMUSnapshotInfo *sn_info);
+ QEMUSnapshotInfo *sn_info,
+ Error **errp);
int bdrv_snapshot_goto(BlockDriverState *bs,
const char *snapshot_id);
int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id);
diff --git a/block/qcow2-snapshot.c b/block/qcow2-snapshot.c
index 4e7c93b..cf86dae 100644
--- a/block/qcow2-snapshot.c
+++ b/block/qcow2-snapshot.c
@@ -25,6 +25,7 @@
#include "qemu-common.h"
#include "block_int.h"
#include "block/qcow2.h"
+#include "qerror.h"
typedef struct QEMU_PACKED QCowSnapshotHeader {
/* header is 8 byte aligned */
@@ -312,7 +313,9 @@ static int find_snapshot_by_id_or_name(BlockDriverState
*bs, const char *name)
}
/* if no id is provided, a new one is constructed */
-int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
+int qcow2_snapshot_create(BlockDriverState *bs,
+ QEMUSnapshotInfo *sn_info,
+ Error **errp)
{
BDRVQcowState *s = bs->opaque;
QCowSnapshot *new_snapshot_list = NULL;
@@ -331,6 +334,8 @@ int qcow2_snapshot_create(BlockDriverState *bs,
QEMUSnapshotInfo *sn_info)
/* Check that the ID is unique */
if (find_snapshot_by_id(bs, sn_info->id_str) >= 0) {
+ error_set(errp, QERR_INVALID_PARAMETER_VALUE,
+ "name", "non-existing id identifier");
return -EEXIST;
}
@@ -415,6 +420,8 @@ fail:
g_free(sn->name);
g_free(l1_table);
+ error_set(errp, QERR_GENERIC_ERROR, ret);
+
return ret;
}
diff --git a/block/qcow2.h b/block/qcow2.h
index b4eb654..854bd12 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -308,7 +308,9 @@ int qcow2_discard_clusters(BlockDriverState *bs, uint64_t
offset,
int qcow2_zero_clusters(BlockDriverState *bs, uint64_t offset, int nb_sectors);
/* qcow2-snapshot.c functions */
-int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info);
+int qcow2_snapshot_create(BlockDriverState *bs,
+ QEMUSnapshotInfo *sn_info,
+ Error **errp);
int qcow2_snapshot_goto(BlockDriverState *bs, const char *snapshot_id);
int qcow2_snapshot_delete(BlockDriverState *bs, const char *snapshot_id);
int qcow2_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab);
diff --git a/block/rbd.c b/block/rbd.c
index 5a0f79f..7bc42f0 100644
--- a/block/rbd.c
+++ b/block/rbd.c
@@ -16,6 +16,7 @@
#include "qemu-common.h"
#include "qemu-error.h"
#include "block_int.h"
+#include "qerror.h"
#include <rbd/librbd.h>
@@ -817,12 +818,15 @@ static int qemu_rbd_truncate(BlockDriverState *bs,
int64_t offset)
}
static int qemu_rbd_snap_create(BlockDriverState *bs,
- QEMUSnapshotInfo *sn_info)
+ QEMUSnapshotInfo *sn_info,
+ Error **errp)
{
BDRVRBDState *s = bs->opaque;
- int r;
+ int ret;
if (sn_info->name[0] == '\0') {
+ error_set(errp, QERR_INVALID_PARAMETER_VALUE,
+ "name", "some tag identifier");
return -EINVAL; /* we need a name for rbd snapshots */
}
@@ -832,17 +836,21 @@ static int qemu_rbd_snap_create(BlockDriverState *bs,
*/
if (sn_info->id_str[0] != '\0' &&
strcmp(sn_info->id_str, sn_info->name) != 0) {
+ error_set(errp, QERR_INVALID_PARAMETER_VALUE,
+ "name", "id and tag to equal");
return -EINVAL;
}
if (strlen(sn_info->name) >= sizeof(sn_info->id_str)) {
+ error_set(errp, QERR_INVALID_PARAMETER_VALUE,
+ "name", "shorter than 127 chars");
return -ERANGE;
}
- r = rbd_snap_create(s->image, sn_info->name);
- if (r < 0) {
- error_report("failed to create snap: %s", strerror(-r));
- return r;
+ ret = rbd_snap_create(s->image, sn_info->name);
+ if (ret < 0) {
+ error_set(errp, QERR_GENERIC_ERROR, ret);
+ return ret;
}
return 0;
diff --git a/block/sheepdog.c b/block/sheepdog.c
index a04ad99..fc51e04 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -17,6 +17,7 @@
#include "qemu_socket.h"
#include "block_int.h"
#include "bitops.h"
+#include "qerror.h"
#define SD_PROTO_VER 0x01
@@ -1730,7 +1731,9 @@ static int coroutine_fn
sd_co_flush_to_disk(BlockDriverState *bs)
return 0;
}
-static int sd_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
+static int sd_snapshot_create(BlockDriverState *bs,
+ QEMUSnapshotInfo *sn_info,
+ Error **errp)
{
BDRVSheepdogState *s = bs->opaque;
int ret, fd;
@@ -1743,9 +1746,8 @@ static int sd_snapshot_create(BlockDriverState *bs,
QEMUSnapshotInfo *sn_info)
s->name, sn_info->vm_state_size, s->is_snapshot);
if (s->is_snapshot) {
- error_report("You can't create a snapshot of a snapshot VDI, "
- "%s (%" PRIu32 ").", s->name, s->inode.vdi_id);
-
+ error_set(errp, QERR_INVALID_PARAMETER_VALUE,
+ "name", " not VDI snapshot");
return -EINVAL;
}
@@ -1767,15 +1769,12 @@ static int sd_snapshot_create(BlockDriverState *bs,
QEMUSnapshotInfo *sn_info)
ret = write_object(fd, (char *)&s->inode, vid_to_vdi_oid(s->inode.vdi_id),
s->inode.nr_copies, datalen, 0, 0, s->cache_enabled);
if (ret < 0) {
- error_report("failed to write snapshot's inode.");
goto cleanup;
}
ret = do_sd_create(s->name, s->inode.vdi_size, s->inode.vdi_id, &new_vid,
1,
s->addr, s->port);
if (ret < 0) {
- error_report("failed to create inode for snapshot. %s",
- strerror(errno));
goto cleanup;
}
@@ -1785,7 +1784,6 @@ static int sd_snapshot_create(BlockDriverState *bs,
QEMUSnapshotInfo *sn_info)
s->inode.nr_copies, datalen, 0, s->cache_enabled);
if (ret < 0) {
- error_report("failed to read new inode info. %s", strerror(errno));
goto cleanup;
}
@@ -1795,6 +1793,9 @@ static int sd_snapshot_create(BlockDriverState *bs,
QEMUSnapshotInfo *sn_info)
cleanup:
closesocket(fd);
+ if (ret < 0) {
+ error_set(errp, QERR_GENERIC_ERROR, ret);
+ }
return ret;
}
diff --git a/block_int.h b/block_int.h
index 4452f6f..b76c943 100644
--- a/block_int.h
+++ b/block_int.h
@@ -206,7 +206,8 @@ struct BlockDriver {
const uint8_t *buf, int nb_sectors);
int (*bdrv_snapshot_create)(BlockDriverState *bs,
- QEMUSnapshotInfo *sn_info);
+ QEMUSnapshotInfo *sn_info,
+ Error **errp);
int (*bdrv_snapshot_goto)(BlockDriverState *bs,
const char *snapshot_id);
int (*bdrv_snapshot_delete)(BlockDriverState *bs, const char *snapshot_id);
diff --git a/qemu-img.c b/qemu-img.c
index b41e670..c798d66 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -1267,7 +1267,7 @@ static int img_snapshot(int argc, char **argv)
sn.date_sec = tv.tv_sec;
sn.date_nsec = tv.tv_usec * 1000;
- ret = bdrv_snapshot_create(bs, &sn);
+ ret = bdrv_snapshot_create(bs, &sn, NULL);
if (ret) {
error_report("Could not create snapshot '%s': %d (%s)",
snapshot_name, ret, strerror(-ret));
diff --git a/savevm.c b/savevm.c
index 0ea10c9..1b67af6 100644
--- a/savevm.c
+++ b/savevm.c
@@ -2165,7 +2165,7 @@ void do_savevm(Monitor *mon, const QDict *qdict)
if (bdrv_can_snapshot(bs1)) {
/* Write VM state size only to the image that contains the state */
sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
- ret = bdrv_snapshot_create(bs1, sn);
+ ret = bdrv_snapshot_create(bs1, sn, NULL);
if (ret < 0) {
monitor_printf(mon, "Error while creating snapshot on '%s'\n",
bdrv_get_device_name(bs1));
--
1.7.11.2
[Qemu-devel] [PATCH 05/18] block: add error parameter to bdrv_snapshot_list() and related functions, Pavel Hrdina, 2012/08/15
[Qemu-devel] [PATCH 04/18] block: add error parameter to bdrv_snapshot_delete() and related functions, Pavel Hrdina, 2012/08/15
[Qemu-devel] [PATCH 06/18] block: add error parameter to bdrv_snapshot_find(), Pavel Hrdina, 2012/08/15
[Qemu-devel] [PATCH 07/18] block: add error parameter to del_existing_snapshots(), Pavel Hrdina, 2012/08/15
[Qemu-devel] [PATCH 03/18] block: add error parameter to bdrv_snapshot_goto() and related functions, Pavel Hrdina, 2012/08/15