140 lines
6.3 KiB
C
140 lines
6.3 KiB
C
/* $NetBSD: rf_psstatus.h,v 1.10 2004/04/09 17:01:03 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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#ifndef _RF__RF_PSSTATUS_H_
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#define _RF__RF_PSSTATUS_H_
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#include <dev/raidframe/raidframevar.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
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* 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, _psid) \
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do { \
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RF_LOCK_MUTEX((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex); \
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while((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].lock) { \
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ltsleep(&(_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].lock, \
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PRIBIO, "rflockpss", 0, \
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&(_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex); \
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} \
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(_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].lock = 1; \
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RF_UNLOCK_MUTEX((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex); \
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} while (0);
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#define RF_UNLOCK_PSS_MUTEX(_raidPtr, _psid) \
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RF_LOCK_MUTEX((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex); \
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(_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].lock = 0; \
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wakeup(&(_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].lock); \
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RF_UNLOCK_MUTEX((_raidPtr)->reconControl->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
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* 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
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* has filled & been sent to disk */
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void *rbufsForXor[RF_PS_MAX_BUFS]; /* these are buffers still to
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* be xored into the
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* 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
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* this parity stripe */
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char issued[RF_MAXCOL]; /* issued[i]==1 <=> column i has already
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* issued a read request for the indicated RU */
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RF_CallbackDesc_t *procWaitList; /* list of user procs waiting
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* for recon to be done */
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RF_CallbackDesc_t *blockWaitList; /* list of disks blocked
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* waiting for user write to
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* complete */
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RF_CallbackDesc_t *bufWaitList; /* list of disks blocked waiting to
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* 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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int lock; /* 1 if this hash chain is locked,
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0 otherwise */
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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
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* currently under
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* reconstruction */
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#define RF_PSS_FORCED_ON_WRITE 0x00000002 /* indicates a recon was
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* forced due to a user-write
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* operation */
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#define RF_PSS_FORCED_ON_READ 0x00000004 /* ditto for read, but not
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* currently implemented */
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#define RF_PSS_RECON_BLOCKED 0x00000008 /* reconstruction is currently
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* blocked due to a pending
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* user I/O */
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#define RF_PSS_CREATE 0x00000010 /* tells LookupRUStatus to
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* create the entry */
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#define RF_PSS_BUFFERWAIT 0x00000020 /* someone is waiting for a
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* buffer for this RU */
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int rf_ConfigurePSStatus(RF_ShutdownList_t **, RF_Raid_t *, RF_Config_t *);
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RF_PSStatusHeader_t *rf_MakeParityStripeStatusTable(RF_Raid_t *);
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void rf_FreeParityStripeStatusTable(RF_Raid_t *, RF_PSStatusHeader_t *);
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RF_ReconParityStripeStatus_t *rf_LookupRUStatus(RF_Raid_t *, RF_PSStatusHeader_t *,
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RF_StripeNum_t, RF_ReconUnitNum_t,
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RF_PSSFlags_t,
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RF_ReconParityStripeStatus_t *);
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void rf_PSStatusDelete(RF_Raid_t *, RF_PSStatusHeader_t *,
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RF_ReconParityStripeStatus_t *);
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void rf_RemoveFromActiveReconTable(RF_Raid_t *, RF_StripeNum_t, RF_ReconUnitNum_t);
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RF_ReconParityStripeStatus_t *rf_AllocPSStatus(RF_Raid_t *);
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void rf_FreePSStatus(RF_Raid_t *, RF_ReconParityStripeStatus_t *);
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void rf_PrintPSStatusTable(RF_Raid_t *);
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#endif /* !_RF__RF_PSSTATUS_H_ */
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