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rf_psstatus.h revision 1.2 
      1 /*	$NetBSD: rf_psstatus.h,v 1.2 1999/01/26 02:34:00 oster Exp $	*/
      2 /*
      3  * Copyright (c) 1995 Carnegie-Mellon University.
      4  * All rights reserved.
      5  *
      6  * Author: Mark Holland
      7  *
      8  * Permission to use, copy, modify and distribute this software and
      9  * its documentation is hereby granted, provided that both the copyright
     10  * notice and this permission notice appear in all copies of the
     11  * software, derivative works or modified versions, and any portions
     12  * thereof, and that both notices appear in supporting documentation.
     13  *
     14  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     15  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     16  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     17  *
     18  * Carnegie Mellon requests users of this software to return to
     19  *
     20  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     21  *  School of Computer Science
     22  *  Carnegie Mellon University
     23  *  Pittsburgh PA 15213-3890
     24  *
     25  * any improvements or extensions that they make and grant Carnegie the
     26  * rights to redistribute these changes.
     27  */
     28 
     29 /*****************************************************************************
     30  *
     31  * psstatus.h
     32  *
     33  * The reconstruction code maintains a bunch of status related to the parity
     34  * stripes that are currently under reconstruction.  This header file defines
     35  * the status structures.
     36  *
     37  *****************************************************************************/
     38 
     39 #ifndef _RF__RF_PSSTATUS_H_
     40 #define _RF__RF_PSSTATUS_H_
     41 
     42 #include "rf_types.h"
     43 #include "rf_threadstuff.h"
     44 #include "rf_callback.h"
     45 
     46 #define RF_PS_MAX_BUFS 10 /* max number of bufs we'll accumulate before we do an XOR */
     47 
     48 #define RF_PSS_DEFAULT_TABLESIZE 200
     49 
     50 /*
     51  * Macros to acquire/release the mutex lock on a parity stripe status
     52  * descriptor. Note that we use just one lock for the whole hash chain.
     53  */
     54 #define RF_HASH_PSID(_raid_,_psid_) ( (_psid_) % ((_raid_)->pssTableSize) )   /* simple hash function */
     55 #define RF_LOCK_PSS_MUTEX(_raidPtr, _row, _psid) \
     56   RF_LOCK_MUTEX((_raidPtr)->reconControl[_row]->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex)
     57 #define RF_UNLOCK_PSS_MUTEX(_raidPtr, _row, _psid) \
     58   RF_UNLOCK_MUTEX((_raidPtr)->reconControl[_row]->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex)
     59 
     60 struct RF_ReconParityStripeStatus_s {
     61   RF_StripeNum_t    parityStripeID; /* the parity stripe ID */
     62   RF_ReconUnitNum_t which_ru;       /* which reconstruction unit with the indicated parity stripe */
     63   RF_PSSFlags_t     flags;          /* flags indicating various conditions */
     64   void           *rbuf;         /* this is the accumulating xor sum */
     65   void           *writeRbuf;    /* DEBUG ONLY:  a pointer to the rbuf after it has filled & been sent to disk */
     66   void     *rbufsForXor[RF_PS_MAX_BUFS]; /* these are buffers still to be xored into the accumulating sum */
     67   int             xorBufCount;  /* num buffers waiting to be xored */
     68   int             blockCount;   /* count of # proc that have blocked recon on this parity stripe */
     69   char           *issued;       /* issued[i]==1 <=> column i has already issued a read request for the indicated RU */
     70   RF_CallbackDesc_t *procWaitList; /* list of user procs waiting for recon to be done */
     71   RF_CallbackDesc_t *blockWaitList;/* list of disks blocked waiting for user write to complete */
     72   RF_CallbackDesc_t *bufWaitList;  /* list of disks blocked waiting to acquire a buffer for this RU */
     73   RF_ReconParityStripeStatus_t *next;
     74 };
     75 
     76 struct RF_PSStatusHeader_s {
     77   RF_DECLARE_MUTEX(mutex)               /* mutex for this hash chain */
     78   RF_ReconParityStripeStatus_t *chain;  /* the hash chain */
     79 };
     80 
     81 /* masks for the "flags" field above */
     82 #define RF_PSS_NONE            0x00000000      /* no flags */
     83 #define RF_PSS_UNDER_RECON     0x00000001      /* this parity stripe is currently under reconstruction */
     84 #define RF_PSS_FORCED_ON_WRITE 0x00000002      /* indicates a recon was forced due to a user-write operation */
     85 #define RF_PSS_FORCED_ON_READ  0x00000004      /* ditto for read, but not currently implemented */
     86 #define RF_PSS_RECON_BLOCKED   0x00000008      /* reconstruction is currently blocked due to a pending user I/O */
     87 #define RF_PSS_CREATE          0x00000010      /* tells LookupRUStatus to create the entry */
     88 #define RF_PSS_BUFFERWAIT      0x00000020      /* someone is waiting for a buffer for this RU */
     89 
     90 int rf_ConfigurePSStatus(RF_ShutdownList_t **listp, RF_Raid_t *raidPtr,
     91 	RF_Config_t *cfgPtr);
     92 
     93 RF_PSStatusHeader_t *rf_MakeParityStripeStatusTable(RF_Raid_t *raidPtr);
     94 void rf_FreeParityStripeStatusTable(RF_Raid_t *raidPtr,
     95 	RF_PSStatusHeader_t *pssTable);
     96 RF_ReconParityStripeStatus_t *rf_LookupRUStatus(RF_Raid_t *raidPtr,
     97 	RF_PSStatusHeader_t *pssTable, RF_StripeNum_t psID,
     98 	RF_ReconUnitNum_t which_ru, RF_PSSFlags_t flags, int *created);
     99 void rf_PSStatusDelete(RF_Raid_t *raidPtr, RF_PSStatusHeader_t *pssTable,
    100 	RF_ReconParityStripeStatus_t *pssPtr);
    101 void rf_RemoveFromActiveReconTable(RF_Raid_t *raidPtr, RF_RowCol_t row,
    102 	RF_StripeNum_t psid, RF_ReconUnitNum_t which_ru);
    103 RF_ReconParityStripeStatus_t *rf_AllocPSStatus(RF_Raid_t *raidPtr);
    104 void rf_FreePSStatus(RF_Raid_t *raidPtr, RF_ReconParityStripeStatus_t *p);
    105 void rf_PrintPSStatusTable(RF_Raid_t *raidPtr, RF_RowCol_t row);
    106 
    107 #endif /* !_RF__RF_PSSTATUS_H_ */
    108