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