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/* This file implements SEF hooks for live update of multithreaded block
* drivers.
*/
#include <minix/drivers.h>
#include <minix/blockdriver_mt.h>
#include "driver_mt.h"
/*===========================================================================*
* sef_cb_lu_prepare *
*===========================================================================*/
static int sef_cb_lu_prepare(int state)
{
/* This function is called to decide whether we can enter the given live
* update state, and to prepare for such an update. If we are requested to
* update to a request-free or protocol-free state, make sure there is no work
* pending or being processed, and shut down all worker threads.
*/
switch (state) {
case SEF_LU_STATE_REQUEST_FREE:
case SEF_LU_STATE_PROTOCOL_FREE:
if (!blockdriver_mt_is_idle()) {
printf("libblockdriver(%d): not idle, blocking update\n",
sef_self());
break;
}
blockdriver_mt_suspend();
return OK;
}
return ENOTREADY;
}
/*===========================================================================*
* sef_cb_lu_state_changed *
*===========================================================================*/
static void sef_cb_lu_state_changed(int old_state, int state)
{
/* This function is called in the old driver instance when the state changes.
* We use it to resume normal operation after a failed live update.
*/
if (state != SEF_LU_STATE_NULL)
return;
switch (old_state) {
case SEF_LU_STATE_REQUEST_FREE:
case SEF_LU_STATE_PROTOCOL_FREE:
blockdriver_mt_resume();
}
}
/*===========================================================================*
* sef_cb_init_lu *
*===========================================================================*/
static int sef_cb_init_lu(int type, sef_init_info_t *info)
{
/* This function is called in the new driver instance during a live update.
*/
int r;
/* Perform regular state transfer. */
if ((r = SEF_CB_INIT_LU_DEFAULT(type, info)) != OK)
return r;
/* Recreate worker threads, if necessary. */
switch (info->prepare_state) {
case SEF_LU_STATE_REQUEST_FREE:
case SEF_LU_STATE_PROTOCOL_FREE:
blockdriver_mt_resume();
}
return OK;
}
/*===========================================================================*
* blockdriver_mt_support_lu *
*===========================================================================*/
void blockdriver_mt_support_lu(void)
{
/* Enable suppor for live update of this driver. To be called before
* sef_startup().
*/
/* Register live update callbacks. */
sef_setcb_init_lu(sef_cb_init_lu);
sef_setcb_lu_prepare(sef_cb_lu_prepare);
sef_setcb_lu_state_changed(sef_cb_lu_state_changed);
sef_setcb_lu_state_isvalid(sef_cb_lu_state_isvalid_standard);
}
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