rf_diskqueue.h revision 1.5.8.3
1 /* $NetBSD: rf_diskqueue.h,v 1.5.8.3 2002/10/10 18:41:48 jdolecek 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 * rf_diskqueue.h -- header file for disk queues 32 * 33 * see comments in rf_diskqueue.c 34 * 35 ****************************************************************************************/ 36 37 38 #ifndef _RF__RF_DISKQUEUE_H_ 39 #define _RF__RF_DISKQUEUE_H_ 40 41 #include <dev/raidframe/raidframevar.h> 42 43 #include "rf_threadstuff.h" 44 #include "rf_acctrace.h" 45 #include "rf_alloclist.h" 46 #include "rf_etimer.h" 47 48 49 #include "rf_netbsd.h" 50 51 52 #define RF_IO_NORMAL_PRIORITY 1 53 #define RF_IO_LOW_PRIORITY 0 54 55 /* the data held by a disk queue entry */ 56 struct RF_DiskQueueData_s { 57 RF_SectorNum_t sectorOffset; /* sector offset into the disk */ 58 RF_SectorCount_t numSector; /* number of sectors to read/write */ 59 RF_IoType_t type; /* read/write/nop */ 60 caddr_t buf; /* buffer pointer */ 61 RF_StripeNum_t parityStripeID; /* the RAID parity stripe ID this 62 * access is for */ 63 RF_ReconUnitNum_t which_ru; /* which RU within this parity stripe */ 64 int priority; /* the priority of this request */ 65 int (*CompleteFunc) (void *, int); /* function to be called upon 66 * completion */ 67 void *argument; /* argument to be passed to CompleteFunc */ 68 RF_Raid_t *raidPtr; /* needed for simulation */ 69 RF_AccTraceEntry_t *tracerec; /* perf mon only */ 70 RF_Etimer_t qtime; /* perf mon only - time request is in queue */ 71 RF_DiskQueueData_t *next; 72 RF_DiskQueueData_t *prev; 73 RF_DiskQueue_t *queue; /* the disk queue to which this req is 74 * targeted */ 75 RF_DiskQueueDataFlags_t flags; /* flags controlling operation */ 76 77 struct proc *b_proc; /* the b_proc from the original bp passed into 78 * the driver for this I/O */ 79 struct buf *bp; /* a bp to use to get this I/O done */ 80 }; 81 #define RF_LOCK_DISK_QUEUE 0x01 82 #define RF_UNLOCK_DISK_QUEUE 0x02 83 84 /* note: "Create" returns type-specific queue header pointer cast to (void *) */ 85 struct RF_DiskQueueSW_s { 86 RF_DiskQueueType_t queueType; 87 void *(*Create) (RF_SectorCount_t, RF_AllocListElem_t *, RF_ShutdownList_t **); /* creation routine -- 88 * one call per queue in 89 * system */ 90 void (*Enqueue) (void *, RF_DiskQueueData_t *, int); /* enqueue routine */ 91 RF_DiskQueueData_t *(*Dequeue) (void *); /* dequeue routine */ 92 RF_DiskQueueData_t *(*Peek) (void *); /* peek at head of queue */ 93 94 /* the rest are optional: they improve performance, but the driver 95 * will deal with it if they don't exist */ 96 int (*Promote) (void *, RF_StripeNum_t, RF_ReconUnitNum_t); /* promotes priority of 97 * tagged accesses */ 98 }; 99 100 struct RF_DiskQueue_s { 101 RF_DiskQueueSW_t *qPtr; /* access point to queue functions */ 102 void *qHdr; /* queue header, of whatever type */ 103 RF_DECLARE_MUTEX(mutex) /* mutex locking data structures */ 104 RF_DECLARE_COND(cond) /* condition variable for 105 * synchronization */ 106 long numOutstanding; /* number of I/Os currently outstanding on 107 * disk */ 108 long maxOutstanding; /* max # of I/Os that can be outstanding on a 109 * disk (in-kernel only) */ 110 int curPriority; /* the priority of accs all that are currently 111 * outstanding */ 112 long queueLength; /* number of requests in queue */ 113 RF_DiskQueueData_t *nextLockingOp; /* a locking op that has 114 * arrived at the head of the 115 * queue & is waiting for 116 * drainage */ 117 int numWaiting; /* number of threads waiting on this variable. 118 * user-level only */ 119 RF_DiskQueueFlags_t flags; /* terminate, locked */ 120 RF_Raid_t *raidPtr; /* associated array */ 121 dev_t dev; /* device number for kernel version */ 122 RF_SectorNum_t last_deq_sector; /* last sector number dequeued or 123 * dispatched */ 124 int row, col; /* debug only */ 125 struct raidcinfo *rf_cinfo; /* disks component info.. */ 126 }; 127 #define RF_DQ_LOCKED 0x02 /* no new accs allowed until queue is 128 * explicitly unlocked */ 129 130 /* macros setting & returning information about queues and requests */ 131 #define RF_QUEUE_LOCKED(_q) ((_q)->flags & RF_DQ_LOCKED) 132 #define RF_QUEUE_EMPTY(_q) (((_q)->numOutstanding == 0) && ((_q)->nextLockingOp == NULL) && !RF_QUEUE_LOCKED(_q)) 133 #define RF_QUEUE_FULL(_q) ((_q)->numOutstanding == (_q)->maxOutstanding) 134 135 #define RF_LOCK_QUEUE(_q) (_q)->flags |= RF_DQ_LOCKED 136 #define RF_UNLOCK_QUEUE(_q) (_q)->flags &= ~RF_DQ_LOCKED 137 138 #define RF_LOCK_QUEUE_MUTEX(_q_,_wh_) RF_LOCK_MUTEX((_q_)->mutex) 139 #define RF_UNLOCK_QUEUE_MUTEX(_q_,_wh_) RF_UNLOCK_MUTEX((_q_)->mutex) 140 141 #define RF_LOCKING_REQ(_r) ((_r)->flags & RF_LOCK_DISK_QUEUE) 142 #define RF_UNLOCKING_REQ(_r) ((_r)->flags & RF_UNLOCK_DISK_QUEUE) 143 144 /* whether it is ok to dispatch a regular request */ 145 #define RF_OK_TO_DISPATCH(_q_,_r_) \ 146 (RF_QUEUE_EMPTY(_q_) || \ 147 (!RF_QUEUE_FULL(_q_) && ((_r_)->priority >= (_q_)->curPriority))) 148 149 int rf_ConfigureDiskQueueSystem(RF_ShutdownList_t ** listp); 150 151 void rf_TerminateDiskQueues(RF_Raid_t * raidPtr); 152 153 int 154 rf_ConfigureDiskQueues(RF_ShutdownList_t ** listp, RF_Raid_t * raidPtr, 155 RF_Config_t * cfgPtr); 156 157 void rf_DiskIOEnqueue(RF_DiskQueue_t * queue, RF_DiskQueueData_t * req, int pri); 158 159 160 void rf_DiskIOComplete(RF_DiskQueue_t * queue, RF_DiskQueueData_t * req, int status); 161 162 int 163 rf_DiskIOPromote(RF_DiskQueue_t * queue, RF_StripeNum_t parityStripeID, 164 RF_ReconUnitNum_t which_ru); 165 166 RF_DiskQueueData_t * 167 rf_CreateDiskQueueData(RF_IoType_t typ, RF_SectorNum_t ssect, 168 RF_SectorCount_t nsect, caddr_t buf, 169 RF_StripeNum_t parityStripeID, 170 RF_ReconUnitNum_t which_ru, 171 int (*wakeF) (void *, int), 172 void *arg, RF_DiskQueueData_t * next, 173 RF_AccTraceEntry_t * tracerec, 174 void *raidPtr, RF_DiskQueueDataFlags_t flags, 175 void *kb_proc); 176 177 void 178 rf_FreeDiskQueueData(RF_DiskQueueData_t * p); 179 180 int 181 rf_ConfigureDiskQueue(RF_Raid_t *, RF_DiskQueue_t *, RF_RowCol_t, 182 RF_RowCol_t, RF_DiskQueueSW_t *, 183 RF_SectorCount_t, dev_t, int, 184 RF_ShutdownList_t **, 185 RF_AllocListElem_t *); 186 187 #endif /* !_RF__RF_DISKQUEUE_H_ */ 188
Indexes created Wed Sep 24 02:09:48 GMT 2025