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rf_disks.h revision 1.3 
      1 /*	$NetBSD: rf_disks.h,v 1.3 1999/02/05 00:06:09 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  * rf_disks.h -- header file for code related to physical disks
     31  */
     32 
     33 #ifndef _RF__RF_DISKS_H_
     34 #define _RF__RF_DISKS_H_
     35 
     36 #include <sys/types.h>
     37 
     38 #include "rf_archs.h"
     39 #include "rf_types.h"
     40 
     41 /*
     42  * A physical disk can be in one of several states:
     43  * IF YOU ADD A STATE, CHECK TO SEE IF YOU NEED TO MODIFY RF_DEAD_DISK() BELOW.
     44  */
     45 enum RF_DiskStatus_e {
     46 	rf_ds_optimal,		/* no problems */
     47 	rf_ds_failed,		/* reconstruction ongoing */
     48 	rf_ds_reconstructing,	/* reconstruction complete to spare, dead disk
     49 				 * not yet replaced */
     50 	rf_ds_dist_spared,	/* reconstruction complete to distributed
     51 				 * spare space, dead disk not yet replaced */
     52 	rf_ds_spared,		/* reconstruction complete to distributed
     53 				 * spare space, dead disk not yet replaced */
     54 	rf_ds_spare,		/* an available spare disk */
     55 	rf_ds_used_spare	/* a spare which has been used, and hence is
     56 				 * not available */
     57 };
     58 typedef enum RF_DiskStatus_e RF_DiskStatus_t;
     59 
     60 struct RF_RaidDisk_s {
     61 	char    devname[56];	/* name of device file */
     62 	RF_DiskStatus_t status;	/* whether it is up or down */
     63 	RF_RowCol_t spareRow;	/* if in status "spared", this identifies the
     64 				 * spare disk */
     65 	RF_RowCol_t spareCol;	/* if in status "spared", this identifies the
     66 				 * spare disk */
     67 	RF_SectorCount_t numBlocks;	/* number of blocks, obtained via READ
     68 					 * CAPACITY */
     69 	int     blockSize;
     70 	/* XXX the folling is needed since we seem to need SIMULATE defined in
     71 	 * order to get user-land stuff to compile, but we *don't* want this
     72 	 * in the structure for the user-land utilities, as the kernel doesn't
     73 	 * know about it!! (and it messes up the size of the structure, so
     74 	 * there is a communication problem between the kernel and the
     75 	 * userland utils :-(  GO */
     76 #if RF_KEEP_DISKSTATS > 0
     77 	RF_uint64 nreads;
     78 	RF_uint64 nwrites;
     79 #endif				/* RF_KEEP_DISKSTATS > 0 */
     80 	dev_t   dev;
     81 };
     82 /*
     83  * An RF_DiskOp_t ptr is really a pointer to a UAGT_CCB, but I want
     84  * to isolate the cam layer from all other layers, so I typecast to/from
     85  * RF_DiskOp_t * (i.e. void *) at the interfaces.
     86  */
     87 typedef void RF_DiskOp_t;
     88 
     89 /* if a disk is in any of these states, it is inaccessible */
     90 #define RF_DEAD_DISK(_dstat_) (((_dstat_) == rf_ds_spared) || \
     91 	((_dstat_) == rf_ds_reconstructing) || ((_dstat_) == rf_ds_failed) || \
     92 	((_dstat_) == rf_ds_dist_spared))
     93 
     94 int
     95 rf_ConfigureDisks(RF_ShutdownList_t ** listp, RF_Raid_t * raidPtr,
     96     RF_Config_t * cfgPtr);
     97 int
     98 rf_ConfigureSpareDisks(RF_ShutdownList_t ** listp, RF_Raid_t * raidPtr,
     99     RF_Config_t * cfgPtr);
    100 int
    101 rf_ConfigureDisk(RF_Raid_t * raidPtr, char *buf, RF_RaidDisk_t * diskPtr,
    102     RF_DiskOp_t * rdcap_op, RF_DiskOp_t * tur_op, dev_t dev,
    103     RF_RowCol_t row, RF_RowCol_t col);
    104 
    105 #endif				/* !_RF__RF_DISKS_H_ */
    106