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    Add support for an explicit IO error event · 71d793fa
    Daniel P. Berrange 提交于
    This introduces a new event type
    
       VIR_DOMAIN_EVENT_ID_IO_ERROR
    
    This event includes the action that is about to be taken
    as a result of the watchdog triggering
    
      typedef enum {
         VIR_DOMAIN_EVENT_IO_ERROR_NONE = 0,
         VIR_DOMAIN_EVENT_IO_ERROR_PAUSE,
         VIR_DOMAIN_EVENT_IO_ERROR_REPORT,
      } virDomainEventIOErrorAction;
    
    In addition it has the source path of the disk that had the
    error and its unique device alias. It does not include the
    target device name (/dev/sda), since this would preclude
    triggering IO errors from other file backed devices (eg
    serial ports connected to a file)
    
    Thus there is a new callback definition for this event type
    
    typedef void (*virConnectDomainEventIOErrorCallback)(virConnectPtr conn,
                                                         virDomainPtr dom,
                                                         const char *srcPath,
                                                         const char *devAlias,
                                                         int action,
                                                         void *opaque);
    
    This is currently wired up to the QEMU block IO error events
    
    * daemon/remote.c: Dispatch IO error events to client
    * examples/domain-events/events-c/event-test.c: Watch for
      IO error events
    * include/libvirt/libvirt.h.in: Define new IO error event ID
      and callback signature
    * src/conf/domain_event.c, src/conf/domain_event.h,
      src/libvirt_private.syms: Extend API to handle IO error events
    * src/qemu/qemu_driver.c: Connect to the QEMU monitor event
      for block IO errors and emit a libvirt IO error event
    * src/remote/remote_driver.c: Receive and dispatch IO error
      events to application
    * src/remote/remote_protocol.x: Wire protocol definition for
      IO error events
    * src/qemu/qemu_monitor.c, src/qemu/qemu_monitor.h,
      src/qemu/qemu_monitor_json.c: Watch for BLOCK_IO_ERROR event
      from QEMU monitor
    71d793fa
remote.c 190.7 KB