1 /* $NetBSD: rf_psstatus.h,v 1.3 1999/02/05 00:06:15 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@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 47 * we do an XOR */ 48 49 #define RF_PSS_DEFAULT_TABLESIZE 200 50 51 /* 52 * Macros to acquire/release the mutex lock on a parity stripe status 53 * descriptor. Note that we use just one lock for the whole hash chain. 54 */ 55 #define RF_HASH_PSID(_raid_,_psid_) ( (_psid_) % ((_raid_)->pssTableSize) ) /* simple hash function */ 56 #define RF_LOCK_PSS_MUTEX(_raidPtr, _row, _psid) \ 57 RF_LOCK_MUTEX((_raidPtr)->reconControl[_row]->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex) 58 #define RF_UNLOCK_PSS_MUTEX(_raidPtr, _row, _psid) \ 59 RF_UNLOCK_MUTEX((_raidPtr)->reconControl[_row]->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex) 60 61 struct RF_ReconParityStripeStatus_s { 62 RF_StripeNum_t parityStripeID; /* the parity stripe ID */ 63 RF_ReconUnitNum_t which_ru; /* which reconstruction unit with the 64 * indicated parity stripe */ 65 RF_PSSFlags_t flags; /* flags indicating various conditions */ 66 void *rbuf; /* this is the accumulating xor sum */ 67 void *writeRbuf; /* DEBUG ONLY: a pointer to the rbuf after it 68 * has filled & been sent to disk */ 69 void *rbufsForXor[RF_PS_MAX_BUFS]; /* these are buffers still to 70 * be xored into the 71 * accumulating sum */ 72 int xorBufCount; /* num buffers waiting to be xored */ 73 int blockCount; /* count of # proc that have blocked recon on 74 * this parity stripe */ 75 char *issued; /* issued[i]==1 <=> column i has already 76 * issued a read request for the indicated RU */ 77 RF_CallbackDesc_t *procWaitList; /* list of user procs waiting 78 * for recon to be done */ 79 RF_CallbackDesc_t *blockWaitList; /* list of disks blocked 80 * waiting for user write to 81 * complete */ 82 RF_CallbackDesc_t *bufWaitList; /* list of disks blocked waiting to 83 * acquire a buffer for this RU */ 84 RF_ReconParityStripeStatus_t *next; 85 }; 86 87 struct RF_PSStatusHeader_s { 88 RF_DECLARE_MUTEX(mutex) /* mutex for this hash chain */ 89 RF_ReconParityStripeStatus_t *chain; /* the hash chain */ 90 }; 91 /* masks for the "flags" field above */ 92 #define RF_PSS_NONE 0x00000000 /* no flags */ 93 #define RF_PSS_UNDER_RECON 0x00000001 /* this parity stripe is 94 * currently under 95 * reconstruction */ 96 #define RF_PSS_FORCED_ON_WRITE 0x00000002 /* indicates a recon was 97 * forced due to a user-write 98 * operation */ 99 #define RF_PSS_FORCED_ON_READ 0x00000004 /* ditto for read, but not 100 * currently implemented */ 101 #define RF_PSS_RECON_BLOCKED 0x00000008 /* reconstruction is currently 102 * blocked due to a pending 103 * user I/O */ 104 #define RF_PSS_CREATE 0x00000010 /* tells LookupRUStatus to 105 * create the entry */ 106 #define RF_PSS_BUFFERWAIT 0x00000020 /* someone is waiting for a 107 * buffer for this RU */ 108 109 int 110 rf_ConfigurePSStatus(RF_ShutdownList_t ** listp, RF_Raid_t * raidPtr, 111 RF_Config_t * cfgPtr); 112 113 RF_PSStatusHeader_t *rf_MakeParityStripeStatusTable(RF_Raid_t * raidPtr); 114 void 115 rf_FreeParityStripeStatusTable(RF_Raid_t * raidPtr, 116 RF_PSStatusHeader_t * pssTable); 117 RF_ReconParityStripeStatus_t * 118 rf_LookupRUStatus(RF_Raid_t * raidPtr, 119 RF_PSStatusHeader_t * pssTable, RF_StripeNum_t psID, 120 RF_ReconUnitNum_t which_ru, RF_PSSFlags_t flags, int *created); 121 void 122 rf_PSStatusDelete(RF_Raid_t * raidPtr, RF_PSStatusHeader_t * pssTable, 123 RF_ReconParityStripeStatus_t * pssPtr); 124 void 125 rf_RemoveFromActiveReconTable(RF_Raid_t * raidPtr, RF_RowCol_t row, 126 RF_StripeNum_t psid, RF_ReconUnitNum_t which_ru); 127 RF_ReconParityStripeStatus_t *rf_AllocPSStatus(RF_Raid_t * raidPtr); 128 void rf_FreePSStatus(RF_Raid_t * raidPtr, RF_ReconParityStripeStatus_t * p); 129 void rf_PrintPSStatusTable(RF_Raid_t * raidPtr, RF_RowCol_t row); 130 131 #endif /* !_RF__RF_PSSTATUS_H_ */ 132