159 lines
6.2 KiB
C
159 lines
6.2 KiB
C
/* $NetBSD: rf_diskqueue.h,v 1.23 2009/03/23 18:38:54 oster Exp $ */
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/*
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* Copyright (c) 1995 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Mark Holland
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/*****************************************************************************************
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*
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* rf_diskqueue.h -- header file for disk queues
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*
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* see comments in rf_diskqueue.c
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*
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****************************************************************************************/
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#ifndef _RF__RF_DISKQUEUE_H_
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#define _RF__RF_DISKQUEUE_H_
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#include <sys/queue.h>
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#include <dev/raidframe/raidframevar.h>
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#include "rf_threadstuff.h"
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#include "rf_acctrace.h"
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#include "rf_alloclist.h"
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#include "rf_etimer.h"
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#include "rf_netbsd.h"
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#define RF_IO_NORMAL_PRIORITY 1
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#define RF_IO_LOW_PRIORITY 0
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/* the data held by a disk queue entry */
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struct RF_DiskQueueData_s {
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RF_SectorNum_t sectorOffset; /* sector offset into the disk */
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RF_SectorCount_t numSector; /* number of sectors to read/write */
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RF_IoType_t type; /* read/write/nop */
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void *buf; /* buffer pointer */
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RF_StripeNum_t parityStripeID; /* the RAID parity stripe ID this
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* access is for */
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RF_ReconUnitNum_t which_ru; /* which RU within this parity stripe */
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int priority; /* the priority of this request */
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int (*CompleteFunc) (void *, int); /* function to be called upon
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* completion */
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void *argument; /* argument to be passed to CompleteFunc */
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RF_Raid_t *raidPtr; /* needed for simulation */
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RF_AccTraceEntry_t *tracerec; /* perf mon only */
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RF_Etimer_t qtime; /* perf mon only - time request is in queue */
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RF_DiskQueueData_t *next;
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RF_DiskQueueData_t *prev;
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RF_DiskQueue_t *queue; /* the disk queue to which this req is
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* targeted */
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RF_DiskQueueDataFlags_t flags; /* flags controlling operation */
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struct proc *b_proc; /* the b_proc from the original bp passed into
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* the driver for this I/O */
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struct buf *bp; /* a bp to use to get this I/O done */
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/* TAILQ bits for a queue for completed I/O requests */
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TAILQ_ENTRY(RF_DiskQueueData_s) iodone_entries;
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int error; /* Indicate if an error occurred
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on this I/O (1=yes, 0=no) */
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};
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/* note: "Create" returns type-specific queue header pointer cast to (void *) */
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struct RF_DiskQueueSW_s {
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RF_DiskQueueType_t queueType;
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void *(*Create) (RF_SectorCount_t, RF_AllocListElem_t *, RF_ShutdownList_t **); /* creation routine --
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* one call per queue in
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* system */
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void (*Enqueue) (void *, RF_DiskQueueData_t *, int); /* enqueue routine */
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RF_DiskQueueData_t *(*Dequeue) (void *); /* dequeue routine */
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RF_DiskQueueData_t *(*Peek) (void *); /* peek at head of queue */
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/* the rest are optional: they improve performance, but the driver
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* will deal with it if they don't exist */
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int (*Promote) (void *, RF_StripeNum_t, RF_ReconUnitNum_t); /* promotes priority of
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* tagged accesses */
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};
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struct RF_DiskQueue_s {
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const RF_DiskQueueSW_t *qPtr; /* access point to queue functions */
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void *qHdr; /* queue header, of whatever type */
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RF_DECLARE_MUTEX(mutex) /* mutex locking data structures */
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RF_DECLARE_COND(cond) /* condition variable for
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* synchronization */
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long numOutstanding; /* number of I/Os currently outstanding on
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* disk */
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long maxOutstanding; /* max # of I/Os that can be outstanding on a
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* disk (in-kernel only) */
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int curPriority; /* the priority of accs all that are currently
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* outstanding */
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long queueLength; /* number of requests in queue */
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RF_DiskQueueFlags_t flags; /* terminate, locked */
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RF_Raid_t *raidPtr; /* associated array */
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dev_t dev; /* device number for kernel version */
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RF_SectorNum_t last_deq_sector; /* last sector number dequeued or
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* dispatched */
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int col; /* debug only */
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struct raidcinfo *rf_cinfo; /* disks component info.. */
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};
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#define RF_DQ_LOCKED 0x02 /* no new accs allowed until queue is
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* explicitly unlocked */
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/* macros setting & returning information about queues and requests */
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#define RF_QUEUE_EMPTY(_q) ((_q)->numOutstanding == 0)
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#define RF_QUEUE_FULL(_q) ((_q)->numOutstanding == (_q)->maxOutstanding)
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#define RF_LOCK_QUEUE_MUTEX(_q_,_wh_) RF_LOCK_MUTEX((_q_)->mutex)
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#define RF_UNLOCK_QUEUE_MUTEX(_q_,_wh_) RF_UNLOCK_MUTEX((_q_)->mutex)
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/* whether it is ok to dispatch a regular request */
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#define RF_OK_TO_DISPATCH(_q_,_r_) \
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(RF_QUEUE_EMPTY(_q_) || \
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(!RF_QUEUE_FULL(_q_) && ((_r_)->priority >= (_q_)->curPriority)))
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int rf_ConfigureDiskQueueSystem(RF_ShutdownList_t **);
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int rf_ConfigureDiskQueues(RF_ShutdownList_t **, RF_Raid_t *, RF_Config_t *);
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void rf_DiskIOEnqueue(RF_DiskQueue_t *, RF_DiskQueueData_t *, int);
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void rf_DiskIOComplete(RF_DiskQueue_t *, RF_DiskQueueData_t *, int);
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int rf_DiskIOPromote(RF_DiskQueue_t *, RF_StripeNum_t, RF_ReconUnitNum_t);
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RF_DiskQueueData_t *rf_CreateDiskQueueData(RF_IoType_t, RF_SectorNum_t,
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RF_SectorCount_t , void *,
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RF_StripeNum_t, RF_ReconUnitNum_t,
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int (*wakeF) (void *, int),
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void *,
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RF_AccTraceEntry_t *, RF_Raid_t *,
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RF_DiskQueueDataFlags_t,
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void *, int);
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void rf_FreeDiskQueueData(RF_DiskQueueData_t *);
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int rf_ConfigureDiskQueue(RF_Raid_t *, RF_DiskQueue_t *,
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RF_RowCol_t, const RF_DiskQueueSW_t *,
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RF_SectorCount_t, dev_t, int,
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RF_ShutdownList_t **,
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RF_AllocListElem_t *);
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#endif /* !_RF__RF_DISKQUEUE_H_ */
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