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      1 /*	$NetBSD: rf_callback.h,v 1.8 2021/07/23 00:54:45 oster Exp $	*/
      2 /*
      3  * Copyright (c) 1995 Carnegie-Mellon University.
      4  * All rights reserved.
      5  *
      6  * Author: Mark Holland
      7  *
      8  * Permission to use, copy, modify and distribute this software and
      9  * its documentation is hereby granted, provided that both the copyright
     10  * notice and this permission notice appear in all copies of the
     11  * software, derivative works or modified versions, and any portions
     12  * thereof, and that both notices appear in supporting documentation.
     13  *
     14  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     15  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     16  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     17  *
     18  * Carnegie Mellon requests users of this software to return to
     19  *
     20  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     21  *  School of Computer Science
     22  *  Carnegie Mellon University
     23  *  Pittsburgh PA 15213-3890
     24  *
     25  * any improvements or extensions that they make and grant Carnegie the
     26  * rights to redistribute these changes.
     27  */
     28 
     29 /*****************************************************************************************
     30  *
     31  * callback.h -- header file for callback.c
     32  *
     33  * the reconstruction code must manage concurrent I/Os on multiple drives.
     34  * it sometimes needs to suspend operation on a particular drive until some
     35  * condition occurs.  we can't block the thread, of course, or we wouldn't
     36  * be able to manage our other outstanding I/Os.  Instead we just suspend
     37  * new activity on the indicated disk, and create a callback descriptor and
     38  * put it someplace where it will get invoked when the condition that's
     39  * stalling us has cleared.  When the descriptor is invoked, it will call
     40  * a function that will restart operation on the indicated disk.
     41  *
     42  ****************************************************************************************/
     43 
     44 #ifndef _RF__RF_CALLBACK_H_
     45 #define _RF__RF_CALLBACK_H_
     46 
     47 #include <dev/raidframe/raidframevar.h>
     48 
     49 struct RF_CallbackFuncDesc_s {
     50 	void    (*callbackFunc) (void *);	/* function to call */
     51 	void *callbackArg;	/* args to give to function, or just
     52 				 * info about this callback  */
     53 	RF_CallbackFuncDesc_t *next;/* next entry in list */
     54 };
     55 
     56 struct RF_CallbackValueDesc_s {
     57 	RF_uint64 v;
     58 	RF_RowCol_t col;	/* column IDs to give to the callback func */
     59 	RF_CallbackValueDesc_t *next;/* next entry in list */
     60 };
     61 
     62 int     rf_ConfigureCallback(RF_ShutdownList_t ** listp, RF_Raid_t *raidPtr,
     63 			     RF_Config_t *cfgPtr);
     64 RF_CallbackFuncDesc_t *rf_AllocCallbackFuncDesc(RF_Raid_t *raidPtr);
     65 void    rf_FreeCallbackFuncDesc(RF_Raid_t *raidPtr, RF_CallbackFuncDesc_t * p);
     66 RF_CallbackValueDesc_t *rf_AllocCallbackValueDesc(RF_Raid_t *raidPtr);
     67 void    rf_FreeCallbackValueDesc(RF_Raid_t *raidPtr, RF_CallbackValueDesc_t * p);
     68 
     69 #endif				/* !_RF__RF_CALLBACK_H_ */
     70