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migration: implement bdrv_all_find_vmstate_bs helper

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The patch also ensures proper locking for the operation.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
CC: Kevin Wolf <kwolf@redhat.com>
Tested-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Denis V. Lunev 2015-11-19 09:42:10 +03:00 committed by Juan Quintela
parent 0b46160521
commit 7cb1448149
3 changed files with 21 additions and 15 deletions
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15
block/snapshot.c
View File

@ -469,3 +469,18 @@ int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn,
*first_bad_bs = bs;
return err;
}
BlockDriverState *bdrv_all_find_vmstate_bs(void)
{
bool not_found = true;
BlockDriverState *bs = NULL;
while (not_found && (bs = bdrv_next(bs))) {
AioContext *ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
not_found = !bdrv_can_snapshot(bs);
aio_context_release(ctx);
}
return bs;
}

2
include/block/snapshot.h
View File

@ -91,4 +91,6 @@ int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn,
uint64_t vm_state_size,
BlockDriverState **first_bad_bs);
BlockDriverState *bdrv_all_find_vmstate_bs(void);
#endif

19
migration/savevm.c
View File

@ -1905,17 +1905,6 @@ int qemu_loadvm_state(QEMUFile *f)
return ret;
}
static BlockDriverState *find_vmstate_bs(void)
{
BlockDriverState *bs = NULL;
while ((bs = bdrv_next(bs))) {
if (bdrv_can_snapshot(bs)) {
return bs;
}
}
return NULL;
}
void hmp_savevm(Monitor *mon, const QDict *qdict)
{
BlockDriverState *bs, *bs1;
@ -1944,8 +1933,8 @@ void hmp_savevm(Monitor *mon, const QDict *qdict)
return;
}
bs = find_vmstate_bs();
if (!bs) {
bs = bdrv_all_find_vmstate_bs();
if (bs == NULL) {
monitor_printf(mon, "No block device can accept snapshots\n");
return;
}
@ -2054,7 +2043,7 @@ int load_vmstate(const char *name)
return ret;
}
bs_vm_state = find_vmstate_bs();
bs_vm_state = bdrv_all_find_vmstate_bs();
if (!bs_vm_state) {
error_report("No block device supports snapshots");
return -ENOTSUP;
@ -2123,7 +2112,7 @@ void hmp_info_snapshots(Monitor *mon, const QDict *qdict)
int total;
int *available_snapshots;
bs = find_vmstate_bs();
bs = bdrv_all_find_vmstate_bs();
if (!bs) {
monitor_printf(mon, "No available block device supports snapshots\n");
return;