113 lines
5.6 KiB
C
113 lines
5.6 KiB
C
/* $NetBSD: rf_stripelocks.h,v 1.8 2011/05/05 08:21:29 mrg 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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* stripelocks.h -- header file for locking stripes
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*
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* Note that these functions are called from the execution routines of certain
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* DAG Nodes, and so they must be NON-BLOCKING to assure maximum parallelism
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* in the DAG. Accordingly, when a node wants to acquire a lock, it calls
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* AcquireStripeLock, supplying a pointer to a callback function. If the lock
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* is free at the time of the call, 0 is returned, indicating that the lock
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* has been acquired. If the lock is not free, 1 is returned, and a copy of
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* the function pointer and argument are held in the lock table. When the
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* lock becomes free, the callback function is invoked.
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*
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*****************************************************************************/
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#ifndef _RF__RF_STRIPELOCKS_H_
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#define _RF__RF_STRIPELOCKS_H_
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#include <sys/buf.h>
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#include <dev/raidframe/raidframevar.h>
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#include "rf_threadstuff.h"
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#include "rf_general.h"
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struct RF_LockReqDesc_s {
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RF_IoType_t type; /* read or write */
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RF_int64 start, stop; /* start and end of range to be locked */
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RF_int64 start2, stop2; /* start and end of 2nd range to be locked */
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void (*cbFunc) (struct buf *); /* callback function */
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void *cbArg; /* argument to callback function */
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RF_LockReqDesc_t *next; /* next element in chain */
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RF_LockReqDesc_t *templink; /* for making short-lived lists of
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* request descriptors */
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};
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#define RF_ASSERT_VALID_LOCKREQ(_lr_) { \
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RF_ASSERT(RF_IO_IS_R_OR_W((_lr_)->type)); \
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}
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struct RF_StripeLockDesc_s {
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RF_StripeNum_t stripeID;/* the stripe ID */
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RF_LockReqDesc_t *granted; /* unordered list of granted requests */
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RF_LockReqDesc_t *waitersH; /* FIFO queue of all waiting reqs,
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* both read and write (Head and Tail) */
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RF_LockReqDesc_t *waitersT;
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int nWriters; /* number of writers either granted or waiting */
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RF_StripeLockDesc_t *next; /* for hash table collision resolution */
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};
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struct RF_LockTableEntry_s {
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rf_declare_mutex2(mutex); /* mutex on this hash chain */
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RF_StripeLockDesc_t *descList; /* hash chain of lock descriptors */
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};
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/*
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* Initializes a stripe lock descriptor. _defSize is the number of sectors
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* that we lock when there is no parity information in the ASM (e.g. RAID0).
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*/
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#define RF_INIT_LOCK_REQ_DESC(_lrd, _typ, _cbf, _cba, _asm, _defSize) \
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{ \
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(_lrd).type = _typ; \
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(_lrd).start2 = -1; \
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(_lrd).stop2 = -1; \
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if ((_asm)->parityInfo) { \
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(_lrd).start = (_asm)->parityInfo->startSector; \
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(_lrd).stop = (_asm)->parityInfo->startSector + (_asm)->parityInfo->numSector-1; \
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if ((_asm)->parityInfo->next) { \
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(_lrd).start2 = (_asm)->parityInfo->next->startSector; \
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(_lrd).stop2 = (_asm)->parityInfo->next->startSector + (_asm)->parityInfo->next->numSector-1; \
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} \
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} else { \
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(_lrd).start = 0; \
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(_lrd).stop = (_defSize); \
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} \
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(_lrd).templink= NULL; \
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(_lrd).cbFunc = (_cbf); \
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(_lrd).cbArg = (void *) (_cba); \
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}
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int rf_ConfigureStripeLockFreeList(RF_ShutdownList_t **);
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int rf_ConfigureStripeLocks(RF_ShutdownList_t **, RF_Raid_t *, RF_Config_t *);
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int rf_AcquireStripeLock(RF_LockTableEntry_t *, RF_StripeNum_t, RF_LockReqDesc_t *);
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void rf_ReleaseStripeLock(RF_LockTableEntry_t *, RF_StripeNum_t, RF_LockReqDesc_t *);
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#endif /* !_RF__RF_STRIPELOCKS_H_ */
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