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Drivers: hv: utils: Check VSS daemon is listening before a hot backup

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Hyper-V host will send a VSS_OP_HOT_BACKUP request to check if guest is
ready for a live backup/snapshot. The driver should respond to the check
only if the daemon is running and listening to requests. This allows the
host to fallback to standard snapshots in case the VSS daemon is not
running.

Signed-off-by: Alex Ng <alexng@messages.microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alex Ng 2016-09-02 05:58:25 -07:00 committed by Greg Kroah-Hartman
parent 497af84b81
commit db886e4d24
2 changed files with 9 additions and 3 deletions
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9
drivers/hv/hv_snapshot.c
View File

@ -142,6 +142,11 @@ static int vss_on_msg(void *msg, int len)
return vss_handle_handshake(vss_msg);
} else if (vss_transaction.state == HVUTIL_USERSPACE_REQ) {
vss_transaction.state = HVUTIL_USERSPACE_RECV;
if (vss_msg->vss_hdr.operation == VSS_OP_HOT_BACKUP)
vss_transaction.msg->vss_cf.flags =
VSS_HBU_NO_AUTO_RECOVERY;
if (cancel_delayed_work_sync(&vss_timeout_work)) {
vss_respond_to_host(vss_msg->error);
/* Transaction is finished, reset the state. */
@ -202,6 +207,7 @@ static void vss_handle_request(struct work_struct *dummy)
*/
case VSS_OP_THAW:
case VSS_OP_FREEZE:
case VSS_OP_HOT_BACKUP:
if (vss_transaction.state < HVUTIL_READY) {
/* Userspace is not registered yet */
vss_respond_to_host(HV_E_FAIL);
@ -210,9 +216,6 @@ static void vss_handle_request(struct work_struct *dummy)
vss_transaction.state = HVUTIL_HOSTMSG_RECEIVED;
vss_send_op();
return;
case VSS_OP_HOT_BACKUP:
vss_transaction.msg->vss_cf.flags = VSS_HBU_NO_AUTO_RECOVERY;
break;
case VSS_OP_GET_DM_INFO:
vss_transaction.msg->dm_info.flags = 0;
break;

3
tools/hv/hv_vss_daemon.c
View File

@ -250,6 +250,9 @@ int main(int argc, char *argv[])
syslog(LOG_ERR, "/etc/fstab and /proc/mounts");
}
break;
case VSS_OP_HOT_BACKUP:
syslog(LOG_INFO, "VSS: op=CHECK HOT BACKUP\n");
break;
default:
syslog(LOG_ERR, "Illegal op:%d\n", op);
}