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Diffstat (limited to 'sys/dev/raidframe/rf_psstatus.h')
| -rw-r--r-- | sys/dev/raidframe/rf_psstatus.h | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/sys/dev/raidframe/rf_psstatus.h b/sys/dev/raidframe/rf_psstatus.h new file mode 100644 index 0000000..c836d49 --- /dev/null +++ b/sys/dev/raidframe/rf_psstatus.h @@ -0,0 +1,132 @@ +/* $FreeBSD$ */ +/* $NetBSD: rf_psstatus.h,v 1.3 1999/02/05 00:06:15 oster Exp $ */ +/* + * Copyright (c) 1995 Carnegie-Mellon University. + * All rights reserved. + * + * Author: Mark Holland + * + * Permission to use, copy, modify and distribute this software and + * its documentation is hereby granted, provided that both the copyright + * notice and this permission notice appear in all copies of the + * software, derivative works or modified versions, and any portions + * thereof, and that both notices appear in supporting documentation. + * + * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" + * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND + * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. + * + * Carnegie Mellon requests users of this software to return to + * + * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU + * School of Computer Science + * Carnegie Mellon University + * Pittsburgh PA 15213-3890 + * + * any improvements or extensions that they make and grant Carnegie the + * rights to redistribute these changes. + */ + +/***************************************************************************** + * + * psstatus.h + * + * The reconstruction code maintains a bunch of status related to the parity + * stripes that are currently under reconstruction. This header file defines + * the status structures. + * + *****************************************************************************/ + +#ifndef _RF__RF_PSSTATUS_H_ +#define _RF__RF_PSSTATUS_H_ + +#include <dev/raidframe/rf_types.h> +#include <dev/raidframe/rf_threadstuff.h> +#include <dev/raidframe/rf_callback.h> + +#define RF_PS_MAX_BUFS 10 /* max number of bufs we'll accumulate before + * we do an XOR */ + +#define RF_PSS_DEFAULT_TABLESIZE 200 + +/* + * Macros to acquire/release the mutex lock on a parity stripe status + * descriptor. Note that we use just one lock for the whole hash chain. + */ +#define RF_HASH_PSID(_raid_,_psid_) ( (_psid_) % ((_raid_)->pssTableSize) ) /* simple hash function */ +#define RF_LOCK_PSS_MUTEX(_raidPtr, _row, _psid) \ + RF_LOCK_MUTEX((_raidPtr)->reconControl[_row]->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex) +#define RF_UNLOCK_PSS_MUTEX(_raidPtr, _row, _psid) \ + RF_UNLOCK_MUTEX((_raidPtr)->reconControl[_row]->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex) + +struct RF_ReconParityStripeStatus_s { + RF_StripeNum_t parityStripeID; /* the parity stripe ID */ + RF_ReconUnitNum_t which_ru; /* which reconstruction unit with the + * indicated parity stripe */ + RF_PSSFlags_t flags; /* flags indicating various conditions */ + void *rbuf; /* this is the accumulating xor sum */ + void *writeRbuf; /* DEBUG ONLY: a pointer to the rbuf after it + * has filled & been sent to disk */ + void *rbufsForXor[RF_PS_MAX_BUFS]; /* these are buffers still to + * be xored into the + * accumulating sum */ + int xorBufCount; /* num buffers waiting to be xored */ + int blockCount; /* count of # proc that have blocked recon on + * this parity stripe */ + char *issued; /* issued[i]==1 <=> column i has already + * issued a read request for the indicated RU */ + RF_CallbackDesc_t *procWaitList; /* list of user procs waiting + * for recon to be done */ + RF_CallbackDesc_t *blockWaitList; /* list of disks blocked + * waiting for user write to + * complete */ + RF_CallbackDesc_t *bufWaitList; /* list of disks blocked waiting to + * acquire a buffer for this RU */ + RF_ReconParityStripeStatus_t *next; +}; + +struct RF_PSStatusHeader_s { + RF_DECLARE_MUTEX(mutex) /* mutex for this hash chain */ + RF_ReconParityStripeStatus_t *chain; /* the hash chain */ +}; +/* masks for the "flags" field above */ +#define RF_PSS_NONE 0x00000000 /* no flags */ +#define RF_PSS_UNDER_RECON 0x00000001 /* this parity stripe is + * currently under + * reconstruction */ +#define RF_PSS_FORCED_ON_WRITE 0x00000002 /* indicates a recon was + * forced due to a user-write + * operation */ +#define RF_PSS_FORCED_ON_READ 0x00000004 /* ditto for read, but not + * currently implemented */ +#define RF_PSS_RECON_BLOCKED 0x00000008 /* reconstruction is currently + * blocked due to a pending + * user I/O */ +#define RF_PSS_CREATE 0x00000010 /* tells LookupRUStatus to + * create the entry */ +#define RF_PSS_BUFFERWAIT 0x00000020 /* someone is waiting for a + * buffer for this RU */ + +int +rf_ConfigurePSStatus(RF_ShutdownList_t ** listp, RF_Raid_t * raidPtr, + RF_Config_t * cfgPtr); + +RF_PSStatusHeader_t *rf_MakeParityStripeStatusTable(RF_Raid_t * raidPtr); +void +rf_FreeParityStripeStatusTable(RF_Raid_t * raidPtr, + RF_PSStatusHeader_t * pssTable); +RF_ReconParityStripeStatus_t * +rf_LookupRUStatus(RF_Raid_t * raidPtr, + RF_PSStatusHeader_t * pssTable, RF_StripeNum_t psID, + RF_ReconUnitNum_t which_ru, RF_PSSFlags_t flags, int *created); +void +rf_PSStatusDelete(RF_Raid_t * raidPtr, RF_PSStatusHeader_t * pssTable, + RF_ReconParityStripeStatus_t * pssPtr); +void +rf_RemoveFromActiveReconTable(RF_Raid_t * raidPtr, RF_RowCol_t row, + RF_StripeNum_t psid, RF_ReconUnitNum_t which_ru); +RF_ReconParityStripeStatus_t *rf_AllocPSStatus(RF_Raid_t * raidPtr); +void rf_FreePSStatus(RF_Raid_t * raidPtr, RF_ReconParityStripeStatus_t * p); +void rf_PrintPSStatusTable(RF_Raid_t * raidPtr, RF_RowCol_t row); + +#endif /* !_RF__RF_PSSTATUS_H_ */ |
