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migration: return real error code 

make functions propagate errno, instead of just using -EIO.  Add a
comment about what are the return value of qemu_savevm_state_iterate().

Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Juan Quintela 2011-09-22 11:02:14 +02:00
parent dcd1d224df
commit 3934638539
2 changed files with 27 additions and 20 deletions
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6
migration.c
View File

@ -367,6 +367,7 @@ void migrate_fd_connect(FdMigrationState *s)
void migrate_fd_put_ready(void *opaque)
{
FdMigrationState *s = opaque;
int ret;
if (s->state != MIG_STATE_ACTIVE) {
DPRINTF("put_ready returning because of non-active state\n");
@ -374,7 +375,10 @@ void migrate_fd_put_ready(void *opaque)
}
DPRINTF("iterate\n");
if (qemu_savevm_state_iterate(s->mon, s->file) == 1) {
ret = qemu_savevm_state_iterate(s->mon, s->file);
if (ret < 0) {
migrate_fd_error(s);
} else if (ret == 1) {
int old_vm_running = runstate_is_running();
DPRINTF("done iterating\n");

41
savevm.c
View File

@ -1504,6 +1504,7 @@ int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
int shared)
{
SaveStateEntry *se;
int ret;
QTAILQ_FOREACH(se, &savevm_handlers, entry) {
if(se->set_params == NULL) {
@ -1535,15 +1536,21 @@ int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
se->save_live_state(mon, f, QEMU_VM_SECTION_START, se->opaque);
}
if (qemu_file_has_error(f)) {
ret = qemu_file_has_error(f);
if (ret != 0) {
qemu_savevm_state_cancel(mon, f);
return -EIO;
}
return 0;
return ret;
}
/*
* this funtion has three return values:
* negative: there was one error, and we have -errno.
* 0 : We haven't finished, caller have to go again
* 1 : We have finished, we can go to complete phase
*/
int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f)
{
SaveStateEntry *se;
@ -1566,16 +1573,14 @@ int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f)
break;
}
}
if (ret)
return 1;
if (qemu_file_has_error(f)) {
qemu_savevm_state_cancel(mon, f);
return -EIO;
if (ret != 0) {
return ret;
}
return 0;
ret = qemu_file_has_error(f);
if (ret != 0) {
qemu_savevm_state_cancel(mon, f);
}
return ret;
}
int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
@ -1618,10 +1623,7 @@ int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
qemu_put_byte(f, QEMU_VM_EOF);
if (qemu_file_has_error(f))
return -EIO;
return 0;
return qemu_file_has_error(f);
}
void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f)
@ -1661,8 +1663,9 @@ static int qemu_savevm_state(Monitor *mon, QEMUFile *f)
ret = qemu_savevm_state_complete(mon, f);
out:
if (qemu_file_has_error(f))
ret = -EIO;
if (ret == 0) {
ret = qemu_file_has_error(f);
}
if (!ret && saved_vm_running)
vm_start();