191 lines
7.5 KiB
C
191 lines
7.5 KiB
C
/* $NetBSD: rf_reconstruct.h,v 1.21 2005/06/08 02:00:53 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.
|
|
*/
|
|
|
|
/*********************************************************
|
|
* rf_reconstruct.h -- header file for reconstruction code
|
|
*********************************************************/
|
|
|
|
#ifndef _RF__RF_RECONSTRUCT_H_
|
|
#define _RF__RF_RECONSTRUCT_H_
|
|
|
|
#include <dev/raidframe/raidframevar.h>
|
|
#include <sys/time.h>
|
|
#include "rf_reconmap.h"
|
|
#include "rf_psstatus.h"
|
|
|
|
/* reconstruction configuration information */
|
|
struct RF_ReconConfig_s {
|
|
unsigned numFloatingReconBufs; /* number of floating recon bufs to
|
|
* use */
|
|
RF_HeadSepLimit_t headSepLimit; /* how far apart the heads are allow
|
|
* to become, in parity stripes */
|
|
};
|
|
/* a reconstruction buffer */
|
|
struct RF_ReconBuffer_s {
|
|
RF_Raid_t *raidPtr; /* void * to avoid recursive includes */
|
|
caddr_t buffer; /* points to the data */
|
|
RF_StripeNum_t parityStripeID; /* the parity stripe that this data
|
|
* relates to */
|
|
int which_ru; /* which reconstruction unit within the PSS */
|
|
RF_SectorNum_t failedDiskSectorOffset; /* the offset into the failed
|
|
* disk */
|
|
RF_RowCol_t col; /* which disk this buffer belongs to or is
|
|
* targeted at */
|
|
RF_StripeCount_t count; /* counts the # of SUs installed so far */
|
|
int priority; /* used to force hi priority recon */
|
|
RF_RbufType_t type; /* FORCED or FLOATING */
|
|
RF_ReconBuffer_t *next; /* used for buffer management */
|
|
void *arg; /* generic field for general use */
|
|
RF_RowCol_t spRow, spCol; /* spare disk to which this buf should
|
|
* be written */
|
|
/* if dist sparing off, always identifies the replacement disk */
|
|
RF_SectorNum_t spOffset;/* offset into the spare disk */
|
|
/* if dist sparing off, identical to failedDiskSectorOffset */
|
|
RF_ReconParityStripeStatus_t *pssPtr; /* debug- pss associated with
|
|
* issue-pending write */
|
|
};
|
|
/* a reconstruction event descriptor. The event types currently are:
|
|
* RF_REVENT_READDONE -- a read operation has completed
|
|
* RF_REVENT_WRITEDONE -- a write operation has completed
|
|
* RF_REVENT_BUFREADY -- the buffer manager has produced a full buffer
|
|
* RF_REVENT_BLOCKCLEAR -- a reconstruction blockage has been cleared
|
|
* RF_REVENT_BUFCLEAR -- the buffer manager has released a process blocked on submission
|
|
* RF_REVENT_SKIP -- we need to skip the current RU and go on to the next one, typ. b/c we found recon forced
|
|
* RF_REVENT_FORCEDREADONE- a forced-reconstructoin read operation has completed
|
|
*/
|
|
typedef enum RF_Revent_e {
|
|
RF_REVENT_READDONE,
|
|
RF_REVENT_WRITEDONE,
|
|
RF_REVENT_BUFREADY,
|
|
RF_REVENT_BLOCKCLEAR,
|
|
RF_REVENT_BUFCLEAR,
|
|
RF_REVENT_HEADSEPCLEAR,
|
|
RF_REVENT_SKIP,
|
|
RF_REVENT_FORCEDREADDONE,
|
|
RF_REVENT_READ_FAILED,
|
|
RF_REVENT_WRITE_FAILED,
|
|
RF_REVENT_FORCEDREAD_FAILED
|
|
} RF_Revent_t;
|
|
|
|
struct RF_ReconEvent_s {
|
|
RF_Revent_t type; /* what kind of event has occurred */
|
|
RF_RowCol_t col; /* row ID is implicit in the queue in which
|
|
* the event is placed */
|
|
void *arg; /* a generic argument */
|
|
RF_ReconEvent_t *next;
|
|
};
|
|
/*
|
|
* Reconstruction control information maintained per-disk
|
|
* (for surviving disks)
|
|
*/
|
|
struct RF_PerDiskReconCtrl_s {
|
|
RF_ReconCtrl_t *reconCtrl;
|
|
RF_RowCol_t col; /* to make this structure self-identifying */
|
|
RF_StripeNum_t curPSID; /* the next parity stripe ID to check on this
|
|
* disk */
|
|
RF_HeadSepLimit_t headSepCounter; /* counter used to control
|
|
* maximum head separation */
|
|
RF_SectorNum_t diskOffset; /* the offset into the indicated disk
|
|
* of the current PU */
|
|
RF_ReconUnitNum_t ru_count; /* this counts off the recon units
|
|
* within each parity unit */
|
|
RF_ReconBuffer_t *rbuf; /* the recon buffer assigned to this disk */
|
|
};
|
|
/* main reconstruction control structure */
|
|
struct RF_ReconCtrl_s {
|
|
RF_RaidReconDesc_t *reconDesc;
|
|
RF_RowCol_t fcol; /* which column has failed */
|
|
RF_PerDiskReconCtrl_t *perDiskInfo; /* information maintained
|
|
* per-disk */
|
|
RF_ReconMap_t *reconMap;/* map of what has/has not been reconstructed */
|
|
RF_RowCol_t spareCol; /* which of the spare disks we're using */
|
|
RF_StripeNum_t lastPSID;/* the ID of the last parity stripe we want
|
|
* reconstructed */
|
|
int percentComplete;/* percentage completion of reconstruction */
|
|
RF_ReconUnitCount_t numRUsComplete; /* number of Reconstruction Units done */
|
|
RF_ReconUnitCount_t numRUsTotal; /* total number of Reconstruction Units */
|
|
int error; /* non-0 indicates that an error has
|
|
occured during reconstruction, and
|
|
the reconstruction is in the process of
|
|
bailing out. */
|
|
|
|
/* reconstruction event queue */
|
|
RF_ReconEvent_t *eventQueue; /* queue of pending reconstruction
|
|
* events */
|
|
RF_DECLARE_MUTEX(eq_mutex) /* mutex for locking event
|
|
* queue */
|
|
int eq_count; /* debug only */
|
|
|
|
/* reconstruction buffer management */
|
|
RF_DECLARE_MUTEX(rb_mutex) /* mutex for messing around
|
|
* with recon buffers */
|
|
int rb_lock; /* 1 if someone is mucking
|
|
with recon buffers,
|
|
0 otherwise */
|
|
int pending_writes; /* number of writes which
|
|
have not completed */
|
|
RF_ReconBuffer_t *floatingRbufs; /* available floating
|
|
* reconstruction buffers */
|
|
RF_ReconBuffer_t *committedRbufs; /* recon buffers that have
|
|
* been committed to some
|
|
* waiting disk */
|
|
RF_ReconBuffer_t *fullBufferList; /* full buffers waiting to be
|
|
* written out */
|
|
RF_CallbackDesc_t *bufferWaitList; /* disks that are currently
|
|
* blocked waiting for buffers */
|
|
|
|
/* parity stripe status table */
|
|
RF_PSStatusHeader_t *pssTable; /* stores the reconstruction status of
|
|
* active parity stripes */
|
|
|
|
/* maximum-head separation control */
|
|
RF_HeadSepLimit_t minHeadSepCounter; /* the minimum hs counter over
|
|
* all disks */
|
|
RF_CallbackDesc_t *headSepCBList; /* list of callbacks to be
|
|
* done as minPSID advances */
|
|
|
|
/* performance monitoring */
|
|
struct timeval starttime; /* recon start time */
|
|
};
|
|
/* the default priority for reconstruction accesses */
|
|
#define RF_IO_RECON_PRIORITY RF_IO_LOW_PRIORITY
|
|
|
|
int rf_ConfigureReconstruction(RF_ShutdownList_t **);
|
|
int rf_ReconstructFailedDisk(RF_Raid_t *, RF_RowCol_t);
|
|
int rf_ReconstructFailedDiskBasic(RF_Raid_t *, RF_RowCol_t);
|
|
int rf_ReconstructInPlace(RF_Raid_t *, RF_RowCol_t);
|
|
int rf_ContinueReconstructFailedDisk(RF_RaidReconDesc_t *);
|
|
int rf_ForceOrBlockRecon(RF_Raid_t *, RF_AccessStripeMap_t *,
|
|
void (*cbFunc) (RF_Raid_t *, void *),
|
|
void *);
|
|
int rf_UnblockRecon(RF_Raid_t *, RF_AccessStripeMap_t *);
|
|
|
|
extern struct pool rf_reconbuffer_pool;
|
|
|
|
#endif /* !_RF__RF_RECONSTRUCT_H_ */
|