192 lines
7.6 KiB
C
192 lines
7.6 KiB
C
/* $NetBSD: rf_reconstruct.h,v 1.28 2011/05/02 07:29:18 mrg Exp $ */
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/*
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* Copyright (c) 1995 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Mark Holland
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/*********************************************************
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* rf_reconstruct.h -- header file for reconstruction code
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*********************************************************/
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#ifndef _RF__RF_RECONSTRUCT_H_
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#define _RF__RF_RECONSTRUCT_H_
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#include <dev/raidframe/raidframevar.h>
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#include <sys/time.h>
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#include "rf_reconmap.h"
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#include "rf_psstatus.h"
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/* reconstruction configuration information */
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struct RF_ReconConfig_s {
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unsigned numFloatingReconBufs; /* number of floating recon bufs to
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* use */
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RF_HeadSepLimit_t headSepLimit; /* how far apart the heads are allow
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* to become, in parity stripes */
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};
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/* a reconstruction buffer */
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struct RF_ReconBuffer_s {
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RF_Raid_t *raidPtr; /* void *to avoid recursive includes */
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void *buffer; /* points to the data */
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RF_StripeNum_t parityStripeID; /* the parity stripe that this data
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* relates to */
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int which_ru; /* which reconstruction unit within the PSS */
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RF_SectorNum_t failedDiskSectorOffset; /* the offset into the failed
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* disk */
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RF_RowCol_t col; /* which disk this buffer belongs to or is
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* targeted at */
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RF_StripeCount_t count; /* counts the # of SUs installed so far */
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int priority; /* used to force hi priority recon */
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RF_RbufType_t type; /* FORCED or FLOATING */
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RF_ReconBuffer_t *next; /* used for buffer management */
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void *arg; /* generic field for general use */
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RF_RowCol_t spRow, spCol; /* spare disk to which this buf should
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* be written */
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/* if dist sparing off, always identifies the replacement disk */
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RF_SectorNum_t spOffset;/* offset into the spare disk */
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/* if dist sparing off, identical to failedDiskSectorOffset */
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RF_ReconParityStripeStatus_t *pssPtr; /* debug- pss associated with
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* issue-pending write */
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};
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/* a reconstruction event descriptor. The event types currently are:
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* RF_REVENT_READDONE -- a read operation has completed
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* RF_REVENT_WRITEDONE -- a write operation has completed
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* RF_REVENT_BUFREADY -- the buffer manager has produced a full buffer
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* RF_REVENT_BLOCKCLEAR -- a reconstruction blockage has been cleared
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* RF_REVENT_BUFCLEAR -- the buffer manager has released a process blocked on submission
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* RF_REVENT_SKIP -- we need to skip the current RU and go on to the next one, typ. b/c we found recon forced
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* RF_REVENT_FORCEDREADONE- a forced-reconstructoin read operation has completed
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*/
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typedef enum RF_Revent_e {
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RF_REVENT_READDONE,
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RF_REVENT_WRITEDONE,
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RF_REVENT_BUFREADY,
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RF_REVENT_BLOCKCLEAR,
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RF_REVENT_BUFCLEAR,
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RF_REVENT_HEADSEPCLEAR,
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RF_REVENT_SKIP,
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RF_REVENT_FORCEDREADDONE,
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RF_REVENT_READ_FAILED,
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RF_REVENT_WRITE_FAILED,
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RF_REVENT_FORCEDREAD_FAILED
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} RF_Revent_t;
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struct RF_ReconEvent_s {
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RF_Revent_t type; /* what kind of event has occurred */
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RF_RowCol_t col; /* row ID is implicit in the queue in which
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* the event is placed */
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void *arg; /* a generic argument */
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RF_ReconEvent_t *next;
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};
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/*
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* Reconstruction control information maintained per-disk
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* (for surviving disks)
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*/
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struct RF_PerDiskReconCtrl_s {
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RF_ReconCtrl_t *reconCtrl;
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RF_RowCol_t col; /* to make this structure self-identifying */
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RF_StripeNum_t curPSID; /* the next parity stripe ID to check on this
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* disk */
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RF_HeadSepLimit_t headSepCounter; /* counter used to control
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* maximum head separation */
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RF_SectorNum_t diskOffset; /* the offset into the indicated disk
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* of the current PU */
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RF_ReconUnitNum_t ru_count; /* this counts off the recon units
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* within each parity unit */
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RF_ReconBuffer_t *rbuf; /* the recon buffer assigned to this disk */
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};
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/* main reconstruction control structure */
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struct RF_ReconCtrl_s {
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RF_RaidReconDesc_t *reconDesc;
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RF_RowCol_t fcol; /* which column has failed */
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RF_PerDiskReconCtrl_t *perDiskInfo; /* information maintained
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* per-disk */
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RF_ReconMap_t *reconMap;/* map of what has/has not been reconstructed */
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RF_RowCol_t spareCol; /* which of the spare disks we're using */
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RF_StripeNum_t lastPSID;/* the ID of the last parity stripe we want
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* reconstructed */
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int percentComplete;/* percentage completion of reconstruction */
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RF_ReconUnitCount_t numRUsComplete; /* number of Reconstruction Units done */
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RF_ReconUnitCount_t numRUsTotal; /* total number of Reconstruction Units */
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int error; /* non-0 indicates that an error has
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occured during reconstruction, and
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the reconstruction is in the process of
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bailing out. */
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/* reconstruction event queue */
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RF_ReconEvent_t *eventQueue; /* queue of pending reconstruction
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* events */
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rf_declare_mutex2(eq_mutex); /* mutex for locking event */
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rf_declare_cond2(eq_cv); /* queue */
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int eq_count; /* debug only */
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/* reconstruction buffer management */
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rf_declare_mutex2(rb_mutex); /* mutex/cv for messing */
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rf_declare_cond2(rb_cv); /* around with recon buffers */
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int rb_lock; /* 1 if someone is mucking
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with recon buffers,
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0 otherwise */
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int pending_writes; /* number of writes which
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have not completed */
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RF_ReconBuffer_t *floatingRbufs; /* available floating
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* reconstruction buffers */
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RF_ReconBuffer_t *committedRbufs; /* recon buffers that have
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* been committed to some
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* waiting disk */
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RF_ReconBuffer_t *fullBufferList; /* full buffers waiting to be
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* written out */
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RF_CallbackDesc_t *bufferWaitList; /* disks that are currently
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* blocked waiting for buffers */
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/* parity stripe status table */
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RF_PSStatusHeader_t *pssTable; /* stores the reconstruction status of
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* active parity stripes */
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/* maximum-head separation control */
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RF_HeadSepLimit_t minHeadSepCounter; /* the minimum hs counter over
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* all disks */
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RF_CallbackDesc_t *headSepCBList; /* list of callbacks to be
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* done as minPSID advances */
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/* performance monitoring */
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struct timeval starttime; /* recon start time */
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};
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/* the default priority for reconstruction accesses */
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#define RF_IO_RECON_PRIORITY RF_IO_LOW_PRIORITY
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int rf_ConfigureReconstruction(RF_ShutdownList_t **);
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int rf_ReconstructFailedDisk(RF_Raid_t *, RF_RowCol_t);
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int rf_ReconstructFailedDiskBasic(RF_Raid_t *, RF_RowCol_t);
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int rf_ReconstructInPlace(RF_Raid_t *, RF_RowCol_t);
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int rf_ContinueReconstructFailedDisk(RF_RaidReconDesc_t *);
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int rf_ForceOrBlockRecon(RF_Raid_t *, RF_AccessStripeMap_t *,
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void (*cbFunc) (RF_Raid_t *, void *),
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void *);
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int rf_UnblockRecon(RF_Raid_t *, RF_AccessStripeMap_t *);
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void rf_WakeupHeadSepCBWaiters(RF_Raid_t *);
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extern struct pool rf_reconbuffer_pool;
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#endif /* !_RF__RF_RECONSTRUCT_H_ */
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