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1.1 ! nbrk 1: /* $OpenBSD: rf_stripelocks.h,v 1.3 2002/12/16 07:01:05 tdeval Exp $ */
! 2: /* $NetBSD: rf_stripelocks.h,v 1.3 1999/02/05 00:06:18 oster Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1995 Carnegie-Mellon University.
! 6: * All rights reserved.
! 7: *
! 8: * Author: Mark Holland
! 9: *
! 10: * Permission to use, copy, modify and distribute this software and
! 11: * its documentation is hereby granted, provided that both the copyright
! 12: * notice and this permission notice appear in all copies of the
! 13: * software, derivative works or modified versions, and any portions
! 14: * thereof, and that both notices appear in supporting documentation.
! 15: *
! 16: * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
! 17: * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
! 18: * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
! 19: *
! 20: * Carnegie Mellon requests users of this software to return to
! 21: *
! 22: * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
! 23: * School of Computer Science
! 24: * Carnegie Mellon University
! 25: * Pittsburgh PA 15213-3890
! 26: *
! 27: * any improvements or extensions that they make and grant Carnegie the
! 28: * rights to redistribute these changes.
! 29: */
! 30:
! 31: /*****************************************************************************
! 32: *
! 33: * stripelocks.h -- Header file for locking stripes.
! 34: *
! 35: * Note that these functions are called from the execution routines of certain
! 36: * DAG Nodes, and so they must be NON-BLOCKING to assure maximum parallelism
! 37: * in the DAG. Accordingly, when a node wants to acquire a lock, it calls
! 38: * AcquireStripeLock, supplying a pointer to a callback function. If the lock
! 39: * is free at the time of the call, 0 is returned, indicating that the lock
! 40: * has been acquired. If the lock is not free, 1 is returned, and a copy of
! 41: * the function pointer and argument are held in the lock table. When the
! 42: * lock becomes free, the callback function is invoked.
! 43: *
! 44: *****************************************************************************/
! 45:
! 46: #ifndef _RF__RF_STRIPELOCKS_H_
! 47: #define _RF__RF_STRIPELOCKS_H_
! 48:
! 49: #include <sys/buf.h>
! 50:
! 51: #include "rf_types.h"
! 52: #include "rf_threadstuff.h"
! 53: #include "rf_general.h"
! 54:
! 55: struct RF_LockReqDesc_s {
! 56: RF_IoType_t type; /* Read or write. */
! 57: RF_int64 start, stop; /*
! 58: * Start and end of range to
! 59: * be locked.
! 60: */
! 61: RF_int64 start2, stop2;/*
! 62: * Start and end of 2nd range
! 63: * to be locked.
! 64: */
! 65: void (*cbFunc) (struct buf *);
! 66: /* Callback function. */
! 67: void *cbArg; /*
! 68: * Argument to callback
! 69: * function.
! 70: */
! 71: RF_LockReqDesc_t *next; /* Next element in chain. */
! 72: RF_LockReqDesc_t *templink; /*
! 73: * For making short-lived lists
! 74: * of request descriptors.
! 75: */
! 76: };
! 77:
! 78: #define RF_ASSERT_VALID_LOCKREQ(_lr_) do { \
! 79: RF_ASSERT(RF_IO_IS_R_OR_W((_lr_)->type)); \
! 80: } while (0)
! 81:
! 82: struct RF_StripeLockDesc_s {
! 83: RF_StripeNum_t stripeID; /* The stripe ID. */
! 84: RF_LockReqDesc_t *granted; /*
! 85: * Unordered list of granted
! 86: * requests.
! 87: */
! 88: RF_LockReqDesc_t *waitersH; /* FIFO queue of all waiting
! 89: * reqs, both read and write
! 90: * (Head and Tail).
! 91: */
! 92: RF_LockReqDesc_t *waitersT;
! 93: int nWriters; /*
! 94: * Number of writers either
! 95: * granted or waiting.
! 96: */
! 97: RF_StripeLockDesc_t *next; /*
! 98: * For hash table collision
! 99: * resolution.
! 100: */
! 101: };
! 102:
! 103: struct RF_LockTableEntry_s {
! 104: RF_DECLARE_MUTEX (mutex); /* Mutex on this hash chain. */
! 105: RF_StripeLockDesc_t *descList; /*
! 106: * Hash chain of lock
! 107: * descriptors.
! 108: */
! 109: };
! 110:
! 111: /*
! 112: * Initializes a stripe lock descriptor. _defSize is the number of sectors
! 113: * that we lock when there is no parity information in the ASM (e.g. RAID0).
! 114: */
! 115:
! 116: #define RF_INIT_LOCK_REQ_DESC(_lrd, _typ, _cbf, _cba, _asm, _defSize) \
! 117: do { \
! 118: (_lrd).type = _typ; \
! 119: (_lrd).start2 = -1; \
! 120: (_lrd).stop2 = -1; \
! 121: if ((_asm)->parityInfo) { \
! 122: (_lrd).start = (_asm)->parityInfo->startSector; \
! 123: (_lrd).stop = (_asm)->parityInfo->startSector + \
! 124: (_asm)->parityInfo->numSector-1; \
! 125: if ((_asm)->parityInfo->next) { \
! 126: (_lrd).start2 = \
! 127: (_asm)->parityInfo->next->startSector; \
! 128: (_lrd).stop2 = \
! 129: (_asm)->parityInfo->next->startSector + \
! 130: (_asm)->parityInfo->next->numSector-1; \
! 131: } \
! 132: } else { \
! 133: (_lrd).start = 0; \
! 134: (_lrd).stop = (_defSize); \
! 135: } \
! 136: (_lrd).templink= NULL; \
! 137: (_lrd).cbFunc = (_cbf); \
! 138: (_lrd).cbArg = (void *) (_cba); \
! 139: } while (0)
! 140:
! 141: int rf_ConfigureStripeLockFreeList(RF_ShutdownList_t **);
! 142: RF_LockTableEntry_t *rf_MakeLockTable(void);
! 143: void rf_ShutdownStripeLocks(RF_LockTableEntry_t *);
! 144: int rf_ConfigureStripeLocks(RF_ShutdownList_t **, RF_Raid_t *, RF_Config_t *);
! 145: int rf_AcquireStripeLock(RF_LockTableEntry_t *, RF_StripeNum_t,
! 146: RF_LockReqDesc_t *);
! 147: void rf_ReleaseStripeLock(RF_LockTableEntry_t *, RF_StripeNum_t,
! 148: RF_LockReqDesc_t *);
! 149:
! 150: #endif /* !_RF__RF_STRIPELOCKS_H_ */