113 lines
5.6 KiB
C
113 lines
5.6 KiB
C
/* $NetBSD: rf_stripelocks.h,v 1.7 2005/12/11 12:23:37 christos Exp $ */
|
|
/*
|
|
* Copyright (c) 1995 Carnegie-Mellon University.
|
|
* All rights reserved.
|
|
*
|
|
* Author: Mark Holland
|
|
*
|
|
* Permission to use, copy, modify and distribute this software and
|
|
* its documentation is hereby granted, provided that both the copyright
|
|
* notice and this permission notice appear in all copies of the
|
|
* software, derivative works or modified versions, and any portions
|
|
* thereof, and that both notices appear in supporting documentation.
|
|
*
|
|
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
|
|
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
|
|
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
|
|
*
|
|
* Carnegie Mellon requests users of this software to return to
|
|
*
|
|
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
|
|
* School of Computer Science
|
|
* Carnegie Mellon University
|
|
* Pittsburgh PA 15213-3890
|
|
*
|
|
* any improvements or extensions that they make and grant Carnegie the
|
|
* rights to redistribute these changes.
|
|
*/
|
|
|
|
/*****************************************************************************
|
|
*
|
|
* stripelocks.h -- header file for locking stripes
|
|
*
|
|
* Note that these functions are called from the execution routines of certain
|
|
* DAG Nodes, and so they must be NON-BLOCKING to assure maximum parallelism
|
|
* in the DAG. Accordingly, when a node wants to acquire a lock, it calls
|
|
* AcquireStripeLock, supplying a pointer to a callback function. If the lock
|
|
* is free at the time of the call, 0 is returned, indicating that the lock
|
|
* has been acquired. If the lock is not free, 1 is returned, and a copy of
|
|
* the function pointer and argument are held in the lock table. When the
|
|
* lock becomes free, the callback function is invoked.
|
|
*
|
|
*****************************************************************************/
|
|
|
|
#ifndef _RF__RF_STRIPELOCKS_H_
|
|
#define _RF__RF_STRIPELOCKS_H_
|
|
|
|
#include <sys/buf.h>
|
|
#include <dev/raidframe/raidframevar.h>
|
|
|
|
#include "rf_threadstuff.h"
|
|
#include "rf_general.h"
|
|
|
|
struct RF_LockReqDesc_s {
|
|
RF_IoType_t type; /* read or write */
|
|
RF_int64 start, stop; /* start and end of range to be locked */
|
|
RF_int64 start2, stop2; /* start and end of 2nd range to be locked */
|
|
void (*cbFunc) (struct buf *); /* callback function */
|
|
void *cbArg; /* argument to callback function */
|
|
RF_LockReqDesc_t *next; /* next element in chain */
|
|
RF_LockReqDesc_t *templink; /* for making short-lived lists of
|
|
* request descriptors */
|
|
};
|
|
#define RF_ASSERT_VALID_LOCKREQ(_lr_) { \
|
|
RF_ASSERT(RF_IO_IS_R_OR_W((_lr_)->type)); \
|
|
}
|
|
|
|
struct RF_StripeLockDesc_s {
|
|
RF_StripeNum_t stripeID;/* the stripe ID */
|
|
RF_LockReqDesc_t *granted; /* unordered list of granted requests */
|
|
RF_LockReqDesc_t *waitersH; /* FIFO queue of all waiting reqs,
|
|
* both read and write (Head and Tail) */
|
|
RF_LockReqDesc_t *waitersT;
|
|
int nWriters; /* number of writers either granted or waiting */
|
|
RF_StripeLockDesc_t *next; /* for hash table collision resolution */
|
|
};
|
|
|
|
struct RF_LockTableEntry_s {
|
|
RF_DECLARE_MUTEX(mutex) /* mutex on this hash chain */
|
|
RF_StripeLockDesc_t *descList; /* hash chain of lock descriptors */
|
|
};
|
|
/*
|
|
* Initializes a stripe lock descriptor. _defSize is the number of sectors
|
|
* that we lock when there is no parity information in the ASM (e.g. RAID0).
|
|
*/
|
|
|
|
#define RF_INIT_LOCK_REQ_DESC(_lrd, _typ, _cbf, _cba, _asm, _defSize) \
|
|
{ \
|
|
(_lrd).type = _typ; \
|
|
(_lrd).start2 = -1; \
|
|
(_lrd).stop2 = -1; \
|
|
if ((_asm)->parityInfo) { \
|
|
(_lrd).start = (_asm)->parityInfo->startSector; \
|
|
(_lrd).stop = (_asm)->parityInfo->startSector + (_asm)->parityInfo->numSector-1; \
|
|
if ((_asm)->parityInfo->next) { \
|
|
(_lrd).start2 = (_asm)->parityInfo->next->startSector; \
|
|
(_lrd).stop2 = (_asm)->parityInfo->next->startSector + (_asm)->parityInfo->next->numSector-1; \
|
|
} \
|
|
} else { \
|
|
(_lrd).start = 0; \
|
|
(_lrd).stop = (_defSize); \
|
|
} \
|
|
(_lrd).templink= NULL; \
|
|
(_lrd).cbFunc = (_cbf); \
|
|
(_lrd).cbArg = (void *) (_cba); \
|
|
}
|
|
|
|
int rf_ConfigureStripeLockFreeList(RF_ShutdownList_t **);
|
|
int rf_ConfigureStripeLocks(RF_ShutdownList_t **, RF_Raid_t *, RF_Config_t *);
|
|
int rf_AcquireStripeLock(RF_LockTableEntry_t *, RF_StripeNum_t, RF_LockReqDesc_t *);
|
|
void rf_ReleaseStripeLock(RF_LockTableEntry_t *, RF_StripeNum_t, RF_LockReqDesc_t *);
|
|
|
|
#endif /* !_RF__RF_STRIPELOCKS_H_ */
|