fd4c2b74f3
The implementation is in libblockdriver, and works transparently for all block drivers. The new btrace(8) tool can be used to control block tracing; see ``man btrace'' for details.
98 lines
3.1 KiB
C
98 lines
3.1 KiB
C
/* This file contains the singlethreaded device driver interface.
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*
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* Changes:
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* Aug 27, 2011 extracted from driver.c (A. Welzel)
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*
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* The entry points into this file are:
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* blockdriver_task: the main message loop of the driver
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* blockdriver_terminate: break out of the main message loop
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* blockdriver_handle_msg: handle a single received message
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* blockdriver_receive_mq: message receive interface with message queueing
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* blockdriver_mq_queue: queue an incoming message for later processing
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*/
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#include <minix/drivers.h>
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#include <minix/blockdriver.h>
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#include "driver.h"
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#include "mq.h"
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PRIVATE int running;
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/*===========================================================================*
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* blockdriver_receive_mq *
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*===========================================================================*/
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PUBLIC int blockdriver_receive_mq(message *m_ptr, int *status_ptr)
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{
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/* receive() interface for drivers with message queueing. */
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/* Any queued messages? */
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if (mq_dequeue(SINGLE_THREAD, m_ptr, status_ptr))
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return OK;
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/* Fall back to standard receive() interface otherwise. */
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return driver_receive(ANY, m_ptr, status_ptr);
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}
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/*===========================================================================*
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* blockdriver_terminate *
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*===========================================================================*/
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PUBLIC void blockdriver_terminate(void)
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{
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/* Break out of the main driver loop after finishing the current request. */
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running = FALSE;
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}
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/*===========================================================================*
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* blockdriver_task *
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*===========================================================================*/
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PUBLIC void blockdriver_task(struct blockdriver *bdp)
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{
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/* Main program of any block device driver task. */
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int r, ipc_status;
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message mess;
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running = TRUE;
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/* Here is the main loop of the disk task. It waits for a message, carries
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* it out, and sends a reply.
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*/
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while (running) {
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if ((r = blockdriver_receive_mq(&mess, &ipc_status)) != OK)
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panic("blockdriver_receive_mq failed: %d", r);
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blockdriver_process(bdp, &mess, ipc_status);
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}
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}
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/*===========================================================================*
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* blockdriver_process *
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*===========================================================================*/
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PUBLIC void blockdriver_process(struct blockdriver *bdp, message *m_ptr,
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int ipc_status)
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{
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/* Handle the given received message. */
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int r;
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/* Process the notification or request. */
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if (is_ipc_notify(ipc_status)) {
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blockdriver_handle_notify(bdp, m_ptr);
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/* Do not reply to notifications. */
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} else {
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r = blockdriver_handle_request(bdp, m_ptr, SINGLE_THREAD);
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blockdriver_reply(m_ptr, ipc_status, r);
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}
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}
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/*===========================================================================*
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* blockdriver_mq_queue *
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*===========================================================================*/
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PUBLIC int blockdriver_mq_queue(message *m, int status)
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{
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/* Queue a message for later processing. */
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return mq_enqueue(SINGLE_THREAD, m, status);
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}
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