rf_diskqueue.h revision 1.6.10.1
1 /* $NetBSD: rf_diskqueue.h,v 1.6.10.1 2002/08/29 05:22:49 gehenna 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 long entryTime; 72 RF_DiskQueueData_t *next; 73 RF_DiskQueueData_t *prev; 74 caddr_t buf2; /* for read-op-write */ 75 dev_t dev; /* the device number for in-kernel version */ 76 RF_DiskQueue_t *queue; /* the disk queue to which this req is 77 * targeted */ 78 RF_DiskQueueDataFlags_t flags; /* flags controlling operation */ 79 80 struct proc *b_proc; /* the b_proc from the original bp passed into 81 * the driver for this I/O */ 82 struct buf *bp; /* a bp to use to get this I/O done */ 83 }; 84 #define RF_LOCK_DISK_QUEUE 0x01 85 #define RF_UNLOCK_DISK_QUEUE 0x02 86 87 /* note: "Create" returns type-specific queue header pointer cast to (void *) */ 88 struct RF_DiskQueueSW_s { 89 RF_DiskQueueType_t queueType; 90 void *(*Create) (RF_SectorCount_t, RF_AllocListElem_t *, RF_ShutdownList_t **); /* creation routine -- 91 * one call per queue in 92 * system */ 93 void (*Enqueue) (void *, RF_DiskQueueData_t *, int); /* enqueue routine */ 94 RF_DiskQueueData_t *(*Dequeue) (void *); /* dequeue routine */ 95 RF_DiskQueueData_t *(*Peek) (void *); /* peek at head of queue */ 96 97 /* the rest are optional: they improve performance, but the driver 98 * will deal with it if they don't exist */ 99 int (*Promote) (void *, RF_StripeNum_t, RF_ReconUnitNum_t); /* promotes priority of 100 * tagged accesses */ 101 }; 102 103 struct RF_DiskQueue_s { 104 RF_DiskQueueSW_t *qPtr; /* access point to queue functions */ 105 void *qHdr; /* queue header, of whatever type */ 106 RF_DECLARE_MUTEX(mutex) /* mutex locking data structures */ 107 RF_DECLARE_COND(cond) /* condition variable for 108 * synchronization */ 109 long numOutstanding; /* number of I/Os currently outstanding on 110 * disk */ 111 long maxOutstanding; /* max # of I/Os that can be outstanding on a 112 * disk (in-kernel only) */ 113 int curPriority; /* the priority of accs all that are currently 114 * outstanding */ 115 long queueLength; /* number of requests in queue */ 116 RF_DiskQueueData_t *nextLockingOp; /* a locking op that has 117 * arrived at the head of the 118 * queue & is waiting for 119 * drainage */ 120 RF_DiskQueueData_t *unlockingOp; /* used at user level to 121 * communicate unlocking op 122 * b/w user (or dag exec) & 123 * disk threads */ 124 int numWaiting; /* number of threads waiting on this variable. 125 * user-level only */ 126 RF_DiskQueueFlags_t flags; /* terminate, locked */ 127 RF_Raid_t *raidPtr; /* associated array */ 128 dev_t dev; /* device number for kernel version */ 129 RF_SectorNum_t last_deq_sector; /* last sector number dequeued or 130 * dispatched */ 131 int row, col; /* debug only */ 132 struct raidcinfo *rf_cinfo; /* disks component info.. */ 133 }; 134 #define RF_DQ_LOCKED 0x02 /* no new accs allowed until queue is 135 * explicitly unlocked */ 136 137 /* macros setting & returning information about queues and requests */ 138 #define RF_QUEUE_LOCKED(_q) ((_q)->flags & RF_DQ_LOCKED) 139 #define RF_QUEUE_EMPTY(_q) (((_q)->numOutstanding == 0) && ((_q)->nextLockingOp == NULL) && !RF_QUEUE_LOCKED(_q)) 140 #define RF_QUEUE_FULL(_q) ((_q)->numOutstanding == (_q)->maxOutstanding) 141 142 #define RF_LOCK_QUEUE(_q) (_q)->flags |= RF_DQ_LOCKED 143 #define RF_UNLOCK_QUEUE(_q) (_q)->flags &= ~RF_DQ_LOCKED 144 145 #define RF_LOCK_QUEUE_MUTEX(_q_,_wh_) RF_LOCK_MUTEX((_q_)->mutex) 146 #define RF_UNLOCK_QUEUE_MUTEX(_q_,_wh_) RF_UNLOCK_MUTEX((_q_)->mutex) 147 148 #define RF_LOCKING_REQ(_r) ((_r)->flags & RF_LOCK_DISK_QUEUE) 149 #define RF_UNLOCKING_REQ(_r) ((_r)->flags & RF_UNLOCK_DISK_QUEUE) 150 151 /* whether it is ok to dispatch a regular request */ 152 #define RF_OK_TO_DISPATCH(_q_,_r_) \ 153 (RF_QUEUE_EMPTY(_q_) || \ 154 (!RF_QUEUE_FULL(_q_) && ((_r_)->priority >= (_q_)->curPriority))) 155 156 int rf_ConfigureDiskQueueSystem(RF_ShutdownList_t ** listp); 157 158 void rf_TerminateDiskQueues(RF_Raid_t * raidPtr); 159 160 int 161 rf_ConfigureDiskQueues(RF_ShutdownList_t ** listp, RF_Raid_t * raidPtr, 162 RF_Config_t * cfgPtr); 163 164 void rf_DiskIOEnqueue(RF_DiskQueue_t * queue, RF_DiskQueueData_t * req, int pri); 165 166 167 void rf_DiskIOComplete(RF_DiskQueue_t * queue, RF_DiskQueueData_t * req, int status); 168 169 int 170 rf_DiskIOPromote(RF_DiskQueue_t * queue, RF_StripeNum_t parityStripeID, 171 RF_ReconUnitNum_t which_ru); 172 173 RF_DiskQueueData_t * 174 rf_CreateDiskQueueData(RF_IoType_t typ, RF_SectorNum_t ssect, 175 RF_SectorCount_t nsect, caddr_t buf, 176 RF_StripeNum_t parityStripeID, 177 RF_ReconUnitNum_t which_ru, 178 int (*wakeF) (void *, int), 179 void *arg, RF_DiskQueueData_t * next, 180 RF_AccTraceEntry_t * tracerec, 181 void *raidPtr, RF_DiskQueueDataFlags_t flags, 182 void *kb_proc); 183 184 void 185 rf_FreeDiskQueueData(RF_DiskQueueData_t * p); 186 187 int 188 rf_ConfigureDiskQueue(RF_Raid_t *, RF_DiskQueue_t *, RF_RowCol_t, 189 RF_RowCol_t, RF_DiskQueueSW_t *, 190 RF_SectorCount_t, dev_t, int, 191 RF_ShutdownList_t **, 192 RF_AllocListElem_t *); 193 194 #endif /* !_RF__RF_DISKQUEUE_H_ */ 195
Indexes created Tue Sep 23 20:09:58 GMT 2025