1 /* $NetBSD: rf_psstatus.h,v 1.13 2006/02/14 01:13:33 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 <dev/raidframe/raidframevar.h> 43 44 #include "rf_threadstuff.h" 45 #include "rf_callback.h" 46 47 #define RF_PS_MAX_BUFS 10 /* max number of bufs we'll accumulate before 48 * we do an XOR */ 49 50 #define RF_PSS_DEFAULT_TABLESIZE 200 51 52 /* 53 * Macros to acquire/release the mutex lock on a parity stripe status 54 * descriptor. Note that we use just one lock for the whole hash chain. 55 */ 56 #define RF_HASH_PSID(_raid_,_psid_) ( (_psid_) % ((_raid_)->pssTableSize) ) /* simple hash function */ 57 #define RF_LOCK_PSS_MUTEX(_raidPtr, _psid) \ 58 do { \ 59 RF_LOCK_MUTEX((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex); \ 60 while((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].lock) { \ 61 ltsleep(&(_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].lock, \ 62 PRIBIO, "rflockpss", 0, \ 63 &(_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex); \ 64 } \ 65 (_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].lock = 1; \ 66 RF_UNLOCK_MUTEX((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex); \ 67 } while (0); 68 69 #define RF_UNLOCK_PSS_MUTEX(_raidPtr, _psid) \ 70 RF_LOCK_MUTEX((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex); \ 71 (_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].lock = 0; \ 72 wakeup(&(_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].lock); \ 73 RF_UNLOCK_MUTEX((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex); 74 75 struct RF_ReconParityStripeStatus_s { 76 RF_StripeNum_t parityStripeID; /* the parity stripe ID */ 77 RF_ReconUnitNum_t which_ru; /* which reconstruction unit with the 78 * indicated parity stripe */ 79 RF_PSSFlags_t flags; /* flags indicating various conditions */ 80 void *rbuf; /* this is the accumulating xor sum */ 81 void *writeRbuf; /* DEBUG ONLY: a pointer to the rbuf after it 82 * has filled & been sent to disk */ 83 void *rbufsForXor[RF_PS_MAX_BUFS]; /* these are buffers still to 84 * be xored into the 85 * accumulating sum */ 86 int xorBufCount; /* num buffers waiting to be xored */ 87 int blockCount; /* count of # proc that have blocked recon on 88 * this parity stripe */ 89 char issued[RF_MAXCOL]; /* issued[i]==1 <=> column i has already 90 * issued a read request for the indicated RU */ 91 RF_CallbackDesc_t *procWaitList; /* list of user procs waiting 92 * for recon to be done */ 93 RF_CallbackDesc_t *blockWaitList; /* list of disks blocked 94 * waiting for user write to 95 * complete */ 96 RF_CallbackDesc_t *bufWaitList; /* list of disks blocked waiting to 97 * acquire a buffer for this RU */ 98 RF_ReconParityStripeStatus_t *next; 99 }; 100 101 struct RF_PSStatusHeader_s { 102 RF_DECLARE_MUTEX(mutex) /* mutex for this hash chain */ 103 int lock; /* 1 if this hash chain is locked, 104 0 otherwise */ 105 RF_ReconParityStripeStatus_t *chain; /* the hash chain */ 106 }; 107 /* masks for the "flags" field above */ 108 #define RF_PSS_NONE 0x00000000 /* no flags */ 109 #define RF_PSS_UNDER_RECON 0x00000001 /* this parity stripe is 110 * currently under 111 * reconstruction */ 112 #define RF_PSS_FORCED_ON_WRITE 0x00000002 /* indicates a recon was 113 * forced due to a user-write 114 * operation */ 115 #define RF_PSS_FORCED_ON_READ 0x00000004 /* ditto for read, but not 116 * currently implemented */ 117 #define RF_PSS_RECON_BLOCKED 0x00000008 /* reconstruction is currently 118 * blocked due to a pending 119 * user I/O */ 120 #define RF_PSS_CREATE 0x00000010 /* tells LookupRUStatus to 121 * create the entry */ 122 #define RF_PSS_BUFFERWAIT 0x00000020 /* someone is waiting for a 123 * buffer for this RU */ 124 125 int rf_ConfigurePSStatus(RF_ShutdownList_t **); 126 void rf_InitPSStatus(RF_Raid_t *); 127 RF_PSStatusHeader_t *rf_MakeParityStripeStatusTable(RF_Raid_t *); 128 void rf_FreeParityStripeStatusTable(RF_Raid_t *, RF_PSStatusHeader_t *); 129 RF_ReconParityStripeStatus_t *rf_LookupRUStatus(RF_Raid_t *, RF_PSStatusHeader_t *, 130 RF_StripeNum_t, RF_ReconUnitNum_t, 131 RF_PSSFlags_t, 132 RF_ReconParityStripeStatus_t *); 133 void rf_PSStatusDelete(RF_Raid_t *, RF_PSStatusHeader_t *, 134 RF_ReconParityStripeStatus_t *); 135 void rf_RemoveFromActiveReconTable(RF_Raid_t *, RF_StripeNum_t, RF_ReconUnitNum_t); 136 RF_ReconParityStripeStatus_t *rf_AllocPSStatus(RF_Raid_t *); 137 void rf_FreePSStatus(RF_Raid_t *, RF_ReconParityStripeStatus_t *); 138 void rf_PrintPSStatusTable(RF_Raid_t *); 139 140 #endif /* !_RF__RF_PSSTATUS_H_ */ 141