| 1 | /* $NetBSD: rf_psstatus.h,v 1.14 2011/05/03 08:18:43 mrg 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_mutex2((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex); \ |
| 60 | while((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].lock) { \ |
| 61 | rf_wait_cond2((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].cond,\ |
| 62 | (_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex);\ |
| 63 | } \ |
| 64 | (_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].lock = 1; \ |
| 65 | rf_unlock_mutex2((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex);\ |
| 66 | } while (0); |
| 67 | |
| 68 | #define RF_UNLOCK_PSS_MUTEX(_raidPtr, _psid) \ |
| 69 | rf_lock_mutex2((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex); \ |
| 70 | (_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].lock = 0; \ |
| 71 | rf_broadcast_cond2((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].cond); \ |
| 72 | rf_unlock_mutex2((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex); |
| 73 | |
| 74 | struct RF_ReconParityStripeStatus_s { |
| 75 | RF_StripeNum_t parityStripeID; /* the parity stripe ID */ |
| 76 | RF_ReconUnitNum_t which_ru; /* which reconstruction unit with the |
| 77 | * indicated parity stripe */ |
| 78 | RF_PSSFlags_t flags; /* flags indicating various conditions */ |
| 79 | void *rbuf; /* this is the accumulating xor sum */ |
| 80 | void *writeRbuf; /* DEBUG ONLY: a pointer to the rbuf after it |
| 81 | * has filled & been sent to disk */ |
| 82 | void *rbufsForXor[RF_PS_MAX_BUFS]; /* these are buffers still to |
| 83 | * be xored into the |
| 84 | * accumulating sum */ |
| 85 | int xorBufCount; /* num buffers waiting to be xored */ |
| 86 | int blockCount; /* count of # proc that have blocked recon on |
| 87 | * this parity stripe */ |
| 88 | char issued[RF_MAXCOL]; /* issued[i]==1 <=> column i has already |
| 89 | * issued a read request for the indicated RU */ |
| 90 | RF_CallbackDesc_t *procWaitList; /* list of user procs waiting |
| 91 | * for recon to be done */ |
| 92 | RF_CallbackDesc_t *blockWaitList; /* list of disks blocked |
| 93 | * waiting for user write to |
| 94 | * complete */ |
| 95 | RF_CallbackDesc_t *bufWaitList; /* list of disks blocked waiting to |
| 96 | * acquire a buffer for this RU */ |
| 97 | RF_ReconParityStripeStatus_t *next; |
| 98 | }; |
| 99 | |
| 100 | struct { |
| 101 | rf_declare_mutex2(); /* mutex for this hash chain */ |
| 102 | rf_declare_cond2(); /* and cv for it */ |
| 103 | int ; /* 1 if this hash chain is locked, |
| 104 | 0 otherwise */ |
| 105 | RF_ReconParityStripeStatus_t *; /* 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 | |