edd259d12e
reads. This avoids a problem where many writes will cause the driver to allocate way too much memory. This needs to change to a queueing system later, which will provide a way to limit the memory consumed by the driver. Without these changes, raidframe would use 24M or more on my machine when the buffer cache dumped all its dirty blocks. Now it uses around 200k or so.
181 lines
7.4 KiB
C
181 lines
7.4 KiB
C
/* $NetBSD: rf_desc.h,v 1.2 1999/01/15 17:55:52 explorer 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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* :
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* Log: rf_desc.h,v
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* Revision 1.29 1996/07/22 19:52:16 jimz
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* switched node params to RF_DagParam_t, a union of
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* a 64-bit int and a void *, for better portability
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* attempted hpux port, but failed partway through for
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* lack of a single C compiler capable of compiling all
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* source files
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*
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* Revision 1.28 1996/06/07 22:49:22 jimz
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* fix up raidPtr typing
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*
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* Revision 1.27 1996/06/07 21:33:04 jimz
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* begin using consistent types for sector numbers,
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* stripe numbers, row+col numbers, recon unit numbers
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*
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* Revision 1.26 1996/06/05 18:06:02 jimz
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* Major code cleanup. The Great Renaming is now done.
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* Better modularity. Better typing. Fixed a bunch of
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* synchronization bugs. Made a lot of global stuff
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* per-desc or per-array. Removed dead code.
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*
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* Revision 1.25 1996/06/02 17:31:48 jimz
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* Moved a lot of global stuff into array structure, where it belongs.
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* Fixed up paritylogging, pss modules in this manner. Some general
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* code cleanup. Removed lots of dead code, some dead files.
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*
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* Revision 1.24 1996/05/30 11:29:41 jimz
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* Numerous bug fixes. Stripe lock release code disagreed with the taking code
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* about when stripes should be locked (I made it consistent: no parity, no lock)
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* There was a lot of extra serialization of I/Os which I've removed- a lot of
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* it was to calculate values for the cache code, which is no longer with us.
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* More types, function, macro cleanup. Added code to properly quiesce the array
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* on shutdown. Made a lot of stuff array-specific which was (bogusly) general
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* before. Fixed memory allocation, freeing bugs.
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*
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* Revision 1.23 1996/05/27 18:56:37 jimz
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* more code cleanup
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* better typing
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* compiles in all 3 environments
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*
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* Revision 1.22 1996/05/24 22:17:04 jimz
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* continue code + namespace cleanup
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* typed a bunch of flags
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*
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* Revision 1.21 1996/05/24 04:28:55 jimz
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* release cleanup ckpt
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*
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* Revision 1.20 1996/05/23 21:46:35 jimz
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* checkpoint in code cleanup (release prep)
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* lots of types, function names have been fixed
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*
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* Revision 1.19 1996/05/23 00:33:23 jimz
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* code cleanup: move all debug decls to rf_options.c, all extern
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* debug decls to rf_options.h, all debug vars preceded by rf_
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*
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* Revision 1.18 1996/05/18 19:51:34 jimz
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* major code cleanup- fix syntax, make some types consistent,
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* add prototypes, clean out dead code, et cetera
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*
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* Revision 1.17 1995/12/01 15:58:43 root
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* added copyright info
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*
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* Revision 1.16 1995/11/19 16:31:30 wvcii
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* descriptors now contain an array of dag lists as opposed to a dag header
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*
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* Revision 1.15 1995/11/07 16:24:17 wvcii
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* updated def of _AccessState
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*
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*/
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#ifndef _RF__RF_DESC_H_
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#define _RF__RF_DESC_H_
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#include "rf_archs.h"
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#include "rf_types.h"
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#include "rf_etimer.h"
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#include "rf_dag.h"
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struct RF_RaidReconDesc_s {
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RF_Raid_t *raidPtr; /* raid device descriptor */
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RF_RowCol_t row; /* row of failed disk */
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RF_RowCol_t col; /* col of failed disk */
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int state; /* how far along the reconstruction operation has gotten */
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RF_RaidDisk_t *spareDiskPtr; /* describes target disk for recon (not used in dist sparing) */
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int numDisksDone; /* the number of surviving disks that have completed their work */
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RF_RowCol_t srow; /* row ID of the spare disk (not used in dist sparing) */
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RF_RowCol_t scol; /* col ID of the spare disk (not used in dist sparing) */
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#ifdef KERNEL
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/*
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* Prevent recon from hogging CPU
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*/
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RF_Etimer_t recon_exec_timer;
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RF_uint64 reconExecTimerRunning;
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RF_uint64 reconExecTicks;
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RF_uint64 maxReconExecTicks;
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#endif /* KERNEL */
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#if RF_RECON_STATS > 0
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RF_uint64 hsStallCount; /* head sep stall count */
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RF_uint64 numReconExecDelays;
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RF_uint64 numReconEventWaits;
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#endif /* RF_RECON_STATS > 0 */
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RF_RaidReconDesc_t *next;
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};
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struct RF_RaidAccessDesc_s {
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RF_Raid_t *raidPtr; /* raid device descriptor */
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RF_IoType_t type; /* read or write */
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RF_RaidAddr_t raidAddress; /* starting address in raid address space */
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RF_SectorCount_t numBlocks; /* number of blocks (sectors) to transfer */
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RF_StripeCount_t numStripes; /* number of stripes involved in access */
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caddr_t bufPtr; /* pointer to data buffer */
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#if !defined(KERNEL) && !defined(SIMULATE)
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caddr_t obufPtr; /* real pointer to data buffer */
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#endif /* !KERNEL && !SIMULATE */
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RF_RaidAccessFlags_t flags; /* flags controlling operation */
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int state; /* index into states telling how far along the RAID operation has gotten */
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RF_AccessState_t *states; /* array of states to be run */
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int status; /* pass/fail status of the last operation */
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RF_DagList_t *dagArray; /* array of dag lists, one list per stripe */
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RF_AccessStripeMapHeader_t *asmap; /* the asm for this I/O */
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void *bp; /* buf pointer for this RAID acc. ignored outside the kernel */
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RF_DagHeader_t **paramDAG; /* allows the DAG to be returned to the caller after I/O completion */
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RF_AccessStripeMapHeader_t **paramASM; /* allows the ASM to be returned to the caller after I/O completion */
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RF_AccTraceEntry_t tracerec; /* perf monitoring information for a user access (not for dag stats) */
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void (*callbackFunc)(RF_CBParam_t); /* callback function for this I/O */
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void *callbackArg; /* arg to give to callback func */
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int tid; /* debug only, user-level only: thread id of thr that did this access */
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RF_AllocListElem_t *cleanupList; /* memory to be freed at the end of the access*/
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RF_RaidAccessDesc_t *next;
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RF_RaidAccessDesc_t *head;
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int numPending;
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RF_DECLARE_MUTEX(mutex) /* these are used to implement blocking I/O */
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RF_DECLARE_COND(cond)
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#ifdef SIMULATE
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RF_Owner_t owner;
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#endif /* SIMULATE */
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int async_flag;
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RF_Etimer_t timer; /* used for timing this access */
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};
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#endif /* !_RF__RF_DESC_H_ */
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