/* $NetBSD: rf_psstatus.h,v 1.14 2011/05/03 08:18:43 mrg 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. */ /***************************************************************************** * * psstatus.h * * The reconstruction code maintains a bunch of status related to the parity * stripes that are currently under reconstruction. This header file defines * the status structures. * *****************************************************************************/ #ifndef _RF__RF_PSSTATUS_H_ #define _RF__RF_PSSTATUS_H_ #include #include "rf_threadstuff.h" #include "rf_callback.h" #define RF_PS_MAX_BUFS 10 /* max number of bufs we'll accumulate before * we do an XOR */ #define RF_PSS_DEFAULT_TABLESIZE 200 /* * Macros to acquire/release the mutex lock on a parity stripe status * descriptor. Note that we use just one lock for the whole hash chain. */ #define RF_HASH_PSID(_raid_,_psid_) ( (_psid_) % ((_raid_)->pssTableSize) ) /* simple hash function */ #define RF_LOCK_PSS_MUTEX(_raidPtr, _psid) \ do { \ rf_lock_mutex2((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex); \ while((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].lock) { \ rf_wait_cond2((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].cond,\ (_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex);\ } \ (_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].lock = 1; \ rf_unlock_mutex2((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex);\ } while (0); #define RF_UNLOCK_PSS_MUTEX(_raidPtr, _psid) \ rf_lock_mutex2((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex); \ (_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].lock = 0; \ rf_broadcast_cond2((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].cond); \ rf_unlock_mutex2((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex); struct RF_ReconParityStripeStatus_s { RF_StripeNum_t parityStripeID; /* the parity stripe ID */ RF_ReconUnitNum_t which_ru; /* which reconstruction unit with the * indicated parity stripe */ RF_PSSFlags_t flags; /* flags indicating various conditions */ void *rbuf; /* this is the accumulating xor sum */ void *writeRbuf; /* DEBUG ONLY: a pointer to the rbuf after it * has filled & been sent to disk */ void *rbufsForXor[RF_PS_MAX_BUFS]; /* these are buffers still to * be xored into the * accumulating sum */ int xorBufCount; /* num buffers waiting to be xored */ int blockCount; /* count of # proc that have blocked recon on * this parity stripe */ char issued[RF_MAXCOL]; /* issued[i]==1 <=> column i has already * issued a read request for the indicated RU */ RF_CallbackDesc_t *procWaitList; /* list of user procs waiting * for recon to be done */ RF_CallbackDesc_t *blockWaitList; /* list of disks blocked * waiting for user write to * complete */ RF_CallbackDesc_t *bufWaitList; /* list of disks blocked waiting to * acquire a buffer for this RU */ RF_ReconParityStripeStatus_t *next; }; struct RF_PSStatusHeader_s { rf_declare_mutex2(mutex); /* mutex for this hash chain */ rf_declare_cond2(cond); /* and cv for it */ int lock; /* 1 if this hash chain is locked, 0 otherwise */ RF_ReconParityStripeStatus_t *chain; /* the hash chain */ }; /* masks for the "flags" field above */ #define RF_PSS_NONE 0x00000000 /* no flags */ #define RF_PSS_UNDER_RECON 0x00000001 /* this parity stripe is * currently under * reconstruction */ #define RF_PSS_FORCED_ON_WRITE 0x00000002 /* indicates a recon was * forced due to a user-write * operation */ #define RF_PSS_FORCED_ON_READ 0x00000004 /* ditto for read, but not * currently implemented */ #define RF_PSS_RECON_BLOCKED 0x00000008 /* reconstruction is currently * blocked due to a pending * user I/O */ #define RF_PSS_CREATE 0x00000010 /* tells LookupRUStatus to * create the entry */ #define RF_PSS_BUFFERWAIT 0x00000020 /* someone is waiting for a * buffer for this RU */ int rf_ConfigurePSStatus(RF_ShutdownList_t **); void rf_InitPSStatus(RF_Raid_t *); RF_PSStatusHeader_t *rf_MakeParityStripeStatusTable(RF_Raid_t *); void rf_FreeParityStripeStatusTable(RF_Raid_t *, RF_PSStatusHeader_t *); RF_ReconParityStripeStatus_t *rf_LookupRUStatus(RF_Raid_t *, RF_PSStatusHeader_t *, RF_StripeNum_t, RF_ReconUnitNum_t, RF_PSSFlags_t, RF_ReconParityStripeStatus_t *); void rf_PSStatusDelete(RF_Raid_t *, RF_PSStatusHeader_t *, RF_ReconParityStripeStatus_t *); void rf_RemoveFromActiveReconTable(RF_Raid_t *, RF_StripeNum_t, RF_ReconUnitNum_t); RF_ReconParityStripeStatus_t *rf_AllocPSStatus(RF_Raid_t *); void rf_FreePSStatus(RF_Raid_t *, RF_ReconParityStripeStatus_t *); void rf_PrintPSStatusTable(RF_Raid_t *); #endif /* !_RF__RF_PSSTATUS_H_ */