154 lines
6.8 KiB
C
154 lines
6.8 KiB
C
/* $NetBSD: rf_psstatus.h,v 1.1 1998/11/13 04:20:32 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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* psstatus.h
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*
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* The reconstruction code maintains a bunch of status related to the parity
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* stripes that are currently under reconstruction. This header file defines
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* the status structures.
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*
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*****************************************************************************/
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/* :
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* Log: rf_psstatus.h,v
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* Revision 1.16 1996/06/10 11:55:47 jimz
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* Straightened out some per-array/not-per-array distinctions, fixed
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* a couple bugs related to confusion. Added shutdown lists. Removed
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* layout shutdown function (now subsumed by shutdown lists).
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*
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* Revision 1.15 1996/06/07 22:26:27 jimz
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* type-ify which_ru (RF_ReconUnitNum_t)
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*
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* Revision 1.14 1996/06/07 21:33:04 jimz
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* begin using consistent types for sector numbers,
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* stripe numbers, row+col numbers, recon unit numbers
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*
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* Revision 1.13 1996/06/05 18:06:02 jimz
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* Major code cleanup. The Great Renaming is now done.
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* Better modularity. Better typing. Fixed a bunch of
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* synchronization bugs. Made a lot of global stuff
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* per-desc or per-array. Removed dead code.
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*
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* Revision 1.12 1996/06/02 17:31:48 jimz
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* Moved a lot of global stuff into array structure, where it belongs.
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* Fixed up paritylogging, pss modules in this manner. Some general
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* code cleanup. Removed lots of dead code, some dead files.
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*
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* Revision 1.11 1996/05/24 22:17:04 jimz
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* continue code + namespace cleanup
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* typed a bunch of flags
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*
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* Revision 1.10 1996/05/23 21:46:35 jimz
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* checkpoint in code cleanup (release prep)
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* lots of types, function names have been fixed
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*
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* Revision 1.9 1996/05/23 00:33:23 jimz
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* code cleanup: move all debug decls to rf_options.c, all extern
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* debug decls to rf_options.h, all debug vars preceded by rf_
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*
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* Revision 1.8 1996/05/18 19:51:34 jimz
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* major code cleanup- fix syntax, make some types consistent,
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* add prototypes, clean out dead code, et cetera
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*
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* Revision 1.7 1995/11/30 16:17:28 wvcii
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* added copyright info
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*
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*/
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#ifndef _RF__RF_PSSTATUS_H_
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#define _RF__RF_PSSTATUS_H_
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#include "rf_types.h"
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#include "rf_threadstuff.h"
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#include "rf_callback.h"
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#define RF_PS_MAX_BUFS 10 /* max number of bufs we'll accumulate before we do an XOR */
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#define RF_PSS_DEFAULT_TABLESIZE 200
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/*
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* Macros to acquire/release the mutex lock on a parity stripe status
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* descriptor. Note that we use just one lock for the whole hash chain.
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*/
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#define RF_HASH_PSID(_raid_,_psid_) ( (_psid_) % ((_raid_)->pssTableSize) ) /* simple hash function */
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#define RF_LOCK_PSS_MUTEX(_raidPtr, _row, _psid) \
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RF_LOCK_MUTEX((_raidPtr)->reconControl[_row]->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex)
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#define RF_UNLOCK_PSS_MUTEX(_raidPtr, _row, _psid) \
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RF_UNLOCK_MUTEX((_raidPtr)->reconControl[_row]->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex)
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struct RF_ReconParityStripeStatus_s {
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RF_StripeNum_t parityStripeID; /* the parity stripe ID */
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RF_ReconUnitNum_t which_ru; /* which reconstruction unit with the indicated parity stripe */
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RF_PSSFlags_t flags; /* flags indicating various conditions */
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void *rbuf; /* this is the accumulating xor sum */
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void *writeRbuf; /* DEBUG ONLY: a pointer to the rbuf after it has filled & been sent to disk */
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void *rbufsForXor[RF_PS_MAX_BUFS]; /* these are buffers still to be xored into the accumulating sum */
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int xorBufCount; /* num buffers waiting to be xored */
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int blockCount; /* count of # proc that have blocked recon on this parity stripe */
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char *issued; /* issued[i]==1 <=> column i has already issued a read request for the indicated RU */
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RF_CallbackDesc_t *procWaitList; /* list of user procs waiting for recon to be done */
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RF_CallbackDesc_t *blockWaitList;/* list of disks blocked waiting for user write to complete */
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RF_CallbackDesc_t *bufWaitList; /* list of disks blocked waiting to acquire a buffer for this RU */
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RF_ReconParityStripeStatus_t *next;
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};
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struct RF_PSStatusHeader_s {
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RF_DECLARE_MUTEX(mutex) /* mutex for this hash chain */
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RF_ReconParityStripeStatus_t *chain; /* the hash chain */
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};
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/* masks for the "flags" field above */
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#define RF_PSS_NONE 0x00000000 /* no flags */
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#define RF_PSS_UNDER_RECON 0x00000001 /* this parity stripe is currently under reconstruction */
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#define RF_PSS_FORCED_ON_WRITE 0x00000002 /* indicates a recon was forced due to a user-write operation */
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#define RF_PSS_FORCED_ON_READ 0x00000004 /* ditto for read, but not currently implemented */
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#define RF_PSS_RECON_BLOCKED 0x00000008 /* reconstruction is currently blocked due to a pending user I/O */
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#define RF_PSS_CREATE 0x00000010 /* tells LookupRUStatus to create the entry */
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#define RF_PSS_BUFFERWAIT 0x00000020 /* someone is waiting for a buffer for this RU */
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int rf_ConfigurePSStatus(RF_ShutdownList_t **listp, RF_Raid_t *raidPtr,
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RF_Config_t *cfgPtr);
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RF_PSStatusHeader_t *rf_MakeParityStripeStatusTable(RF_Raid_t *raidPtr);
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void rf_FreeParityStripeStatusTable(RF_Raid_t *raidPtr,
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RF_PSStatusHeader_t *pssTable);
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RF_ReconParityStripeStatus_t *rf_LookupRUStatus(RF_Raid_t *raidPtr,
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RF_PSStatusHeader_t *pssTable, RF_StripeNum_t psID,
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RF_ReconUnitNum_t which_ru, RF_PSSFlags_t flags, int *created);
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void rf_PSStatusDelete(RF_Raid_t *raidPtr, RF_PSStatusHeader_t *pssTable,
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RF_ReconParityStripeStatus_t *pssPtr);
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void rf_RemoveFromActiveReconTable(RF_Raid_t *raidPtr, RF_RowCol_t row,
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RF_StripeNum_t psid, RF_ReconUnitNum_t which_ru);
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RF_ReconParityStripeStatus_t *rf_AllocPSStatus(RF_Raid_t *raidPtr);
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void rf_FreePSStatus(RF_Raid_t *raidPtr, RF_ReconParityStripeStatus_t *p);
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void rf_PrintPSStatusTable(RF_Raid_t *raidPtr, RF_RowCol_t row);
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#endif /* !_RF__RF_PSSTATUS_H_ */
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