538 lines
20 KiB
C
538 lines
20 KiB
C
/* $NetBSD: rf_reconbuffer.c,v 1.1 1998/11/13 04:20:33 oster 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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* rf_reconbuffer.c -- reconstruction buffer manager
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*
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***************************************************/
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/* :
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* Log: rf_reconbuffer.c,v
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* Revision 1.33 1996/07/27 23:36:08 jimz
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* Solaris port of simulator
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*
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* Revision 1.32 1996/07/17 21:00:58 jimz
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* clean up timer interface, tracing
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*
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* Revision 1.31 1996/07/13 00:00:59 jimz
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* sanitized generalized reconstruction architecture
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* cleaned up head sep, rbuf problems
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*
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* Revision 1.30 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 1.29 1996/06/06 01:23:58 jimz
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* don't free reconCtrlPtr until after all fields have been used out of it
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*
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* Revision 1.28 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 1.27 1996/06/03 23:28:26 jimz
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* more bugfixes
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* check in tree to sync for IPDS runs with current bugfixes
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* there still may be a problem with threads in the script test
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* getting I/Os stuck- not trivially reproducible (runs ~50 times
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* in a row without getting stuck)
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*
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* Revision 1.26 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 1.25 1996/05/31 22:26:54 jimz
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* fix a lot of mapping problems, memory allocation problems
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* found some weird lock issues, fixed 'em
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* more code cleanup
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*
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* Revision 1.24 1996/05/30 12:59:18 jimz
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* make etimer happier, more portable
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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 1996/05/23 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 1.20 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 1.19 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 1.18 1995/12/12 18:10:06 jimz
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* MIN -> RF_MIN, MAX -> RF_MAX, ASSERT -> RF_ASSERT
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* fix 80-column brain damage in comments
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*
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* Revision 1.17 1995/12/06 15:03:24 root
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* added copyright info
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*
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*/
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#ifdef _KERNEL
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#define KERNEL
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#endif
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#include "rf_raid.h"
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#include "rf_reconbuffer.h"
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#include "rf_acctrace.h"
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#include "rf_etimer.h"
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#include "rf_general.h"
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#include "rf_debugprint.h"
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#include "rf_revent.h"
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#include "rf_reconutil.h"
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#include "rf_nwayxor.h"
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#ifdef KERNEL
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#define Dprintf1(s,a) if (rf_reconbufferDebug) printf(s,a)
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#define Dprintf2(s,a,b) if (rf_reconbufferDebug) printf(s,a,b)
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#define Dprintf3(s,a,b,c) if (rf_reconbufferDebug) printf(s,a,b,c)
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#define Dprintf4(s,a,b,c,d) if (rf_reconbufferDebug) printf(s,a,b,c,d)
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#define Dprintf5(s,a,b,c,d,e) if (rf_reconbufferDebug) printf(s,a,b,c,d,e)
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#else /* KERNEL */
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#define Dprintf1(s,a) if (rf_reconbufferDebug) rf_debug_printf(s,(void *)((unsigned long)a),NULL,NULL,NULL,NULL,NULL,NULL,NULL)
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#define Dprintf2(s,a,b) if (rf_reconbufferDebug) rf_debug_printf(s,(void *)((unsigned long)a),(void *)((unsigned long)b),NULL,NULL,NULL,NULL,NULL,NULL)
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#define Dprintf3(s,a,b,c) if (rf_reconbufferDebug) rf_debug_printf(s,(void *)((unsigned long)a),(void *)((unsigned long)b),(void *)((unsigned long)c),NULL,NULL,NULL,NULL,NULL)
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#define Dprintf4(s,a,b,c,d) if (rf_reconbufferDebug) rf_debug_printf(s,(void *)((unsigned long)a),(void *)((unsigned long)b),(void *)((unsigned long)c),(void *)((unsigned long)d),NULL,NULL,NULL,NULL)
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#define Dprintf5(s,a,b,c,d,e) if (rf_reconbufferDebug) rf_debug_printf(s,(void *)((unsigned long)a),(void *)((unsigned long)b),(void *)((unsigned long)c),(void *)((unsigned long)d),(void *)((unsigned long)e),NULL,NULL,NULL)
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#endif /* KERNEL */
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#if defined(__NetBSD__) && defined(_KERNEL)
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/* XXX XXX XXX This is wrong, for a number of reasons:
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a) thread_block doesn't exist with UVM
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b) The prototype begin used here is wrong for the regular VM
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(regular VM expects a (char *) as an argument. I don't put
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that in here as this code uses thread_block with no arguments.. :-/
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*/
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#if 0
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void thread_block(void);
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#endif
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#endif
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/*****************************************************************************************
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*
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* Submit a reconstruction buffer to the manager for XOR.
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* We can only submit a buffer if (1) we can xor into an existing buffer, which means
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* we don't have to acquire a new one, (2) we can acquire a floating
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* recon buffer, or (3) the caller has indicated that we are allowed to keep the
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* submitted buffer.
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*
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* Returns non-zero if and only if we were not able to submit.
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* In this case, we append the current disk ID to the wait list on the indicated
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* RU, so that it will be re-enabled when we acquire a buffer for this RU.
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*
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****************************************************************************************/
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/* just to make the code below more readable */
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#define BUFWAIT_APPEND(_cb_, _pssPtr_, _row_, _col_) \
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_cb_ = rf_AllocCallbackDesc(); \
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(_cb_)->row = (_row_); (_cb_)->col = (_col_); (_cb_)->next = (_pssPtr_)->bufWaitList; (_pssPtr_)->bufWaitList = (_cb_);
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/*
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* nWayXorFuncs[i] is a pointer to a function that will xor "i"
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* bufs into the accumulating sum.
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*/
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static RF_VoidFuncPtr nWayXorFuncs[] = {
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NULL,
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(RF_VoidFuncPtr)rf_nWayXor1,
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(RF_VoidFuncPtr)rf_nWayXor2,
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(RF_VoidFuncPtr)rf_nWayXor3,
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(RF_VoidFuncPtr)rf_nWayXor4,
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(RF_VoidFuncPtr)rf_nWayXor5,
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(RF_VoidFuncPtr)rf_nWayXor6,
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(RF_VoidFuncPtr)rf_nWayXor7,
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(RF_VoidFuncPtr)rf_nWayXor8,
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(RF_VoidFuncPtr)rf_nWayXor9
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};
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int rf_SubmitReconBuffer(rbuf, keep_it, use_committed)
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RF_ReconBuffer_t *rbuf; /* the recon buffer to submit */
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int keep_it; /* whether we can keep this buffer or we have to return it */
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int use_committed; /* whether to use a committed or an available recon buffer */
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{
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RF_LayoutSW_t *lp;
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int rc;
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lp = rbuf->raidPtr->Layout.map;
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rc = lp->SubmitReconBuffer(rbuf, keep_it, use_committed);
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return(rc);
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}
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int rf_SubmitReconBufferBasic(rbuf, keep_it, use_committed)
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RF_ReconBuffer_t *rbuf; /* the recon buffer to submit */
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int keep_it; /* whether we can keep this buffer or we have to return it */
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int use_committed; /* whether to use a committed or an available recon buffer */
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{
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RF_Raid_t *raidPtr = rbuf->raidPtr;
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RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
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RF_ReconCtrl_t *reconCtrlPtr = raidPtr->reconControl[rbuf->row];
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RF_ReconParityStripeStatus_t *pssPtr;
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RF_ReconBuffer_t *targetRbuf, *t = NULL; /* temporary rbuf pointers */
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caddr_t ta; /* temporary data buffer pointer */
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RF_CallbackDesc_t *cb, *p;
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int retcode = 0, created = 0;
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RF_Etimer_t timer;
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/* makes no sense to have a submission from the failed disk */
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RF_ASSERT(rbuf);
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RF_ASSERT(rbuf->col != reconCtrlPtr->fcol);
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Dprintf5("RECON: submission by row %d col %d for psid %ld ru %d (failed offset %ld)\n",
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rbuf->row, rbuf->col, (long)rbuf->parityStripeID, rbuf->which_ru, (long)rbuf->failedDiskSectorOffset);
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RF_LOCK_PSS_MUTEX(raidPtr,rbuf->row,rbuf->parityStripeID);
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RF_LOCK_MUTEX(reconCtrlPtr->rb_mutex);
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pssPtr = rf_LookupRUStatus(raidPtr, reconCtrlPtr->pssTable, rbuf->parityStripeID, rbuf->which_ru, RF_PSS_NONE, &created);
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RF_ASSERT(pssPtr); /* if it didn't exist, we wouldn't have gotten an rbuf for it */
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/* check to see if enough buffers have accumulated to do an XOR. If so, there's no need to
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* acquire a floating rbuf. Before we can do any XORing, we must have acquired a destination
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* buffer. If we have, then we can go ahead and do the XOR if (1) including this buffer, enough
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* bufs have accumulated, or (2) this is the last submission for this stripe.
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* Otherwise, we have to go acquire a floating rbuf.
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*/
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targetRbuf = (RF_ReconBuffer_t *) pssPtr->rbuf;
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if ( (targetRbuf != NULL) &&
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((pssPtr->xorBufCount == rf_numBufsToAccumulate-1) || (targetRbuf->count + pssPtr->xorBufCount + 1 == layoutPtr->numDataCol)) ) {
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pssPtr->rbufsForXor[ pssPtr->xorBufCount++ ] = rbuf; /* install this buffer */
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Dprintf3("RECON: row %d col %d invoking a %d-way XOR\n",rbuf->row, rbuf->col,pssPtr->xorBufCount);
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RF_ETIMER_START(timer);
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rf_MultiWayReconXor(raidPtr, pssPtr);
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RF_ETIMER_STOP(timer); RF_ETIMER_EVAL(timer);
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raidPtr->accumXorTimeUs += RF_ETIMER_VAL_US(timer);
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if (!keep_it) {
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raidPtr->recon_tracerecs[rbuf->col].xor_us = RF_ETIMER_VAL_US(timer);
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RF_ETIMER_STOP(raidPtr->recon_tracerecs[rbuf->col].recon_timer);
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RF_ETIMER_EVAL(raidPtr->recon_tracerecs[rbuf->col].recon_timer);
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raidPtr->recon_tracerecs[rbuf->col].specific.recon.recon_return_to_submit_us +=
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RF_ETIMER_VAL_US(raidPtr->recon_tracerecs[rbuf->col].recon_timer);
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RF_ETIMER_START(raidPtr->recon_tracerecs[rbuf->col].recon_timer);
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rf_LogTraceRec(raidPtr, &raidPtr->recon_tracerecs[rbuf->col]);
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}
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rf_CheckForFullRbuf(raidPtr, reconCtrlPtr, pssPtr, layoutPtr->numDataCol);
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/* if use_committed is on, we _must_ consume a buffer off the committed list. */
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if (use_committed) {
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t = reconCtrlPtr->committedRbufs;
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RF_ASSERT(t);
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reconCtrlPtr->committedRbufs = t->next;
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rf_ReleaseFloatingReconBuffer(raidPtr, rbuf->row, t);
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}
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if (keep_it) {
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RF_UNLOCK_PSS_MUTEX( raidPtr,rbuf->row,rbuf->parityStripeID);
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RF_UNLOCK_MUTEX( reconCtrlPtr->rb_mutex );
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rf_FreeReconBuffer(rbuf);
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return(retcode);
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}
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goto out;
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}
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/* set the value of "t", which we'll use as the rbuf from here on */
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if (keep_it) {
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t = rbuf;
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}
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else {
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if (use_committed) { /* if a buffer has been committed to us, use it */
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t = reconCtrlPtr->committedRbufs;
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RF_ASSERT(t);
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reconCtrlPtr->committedRbufs = t->next;
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t->next = NULL;
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} else if (reconCtrlPtr->floatingRbufs) {
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t = reconCtrlPtr->floatingRbufs;
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reconCtrlPtr->floatingRbufs = t->next;
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t->next = NULL;
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}
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}
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/* If we weren't able to acquire a buffer,
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* append to the end of the buf list in the recon ctrl struct.
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*/
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if (!t) {
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RF_ASSERT(!keep_it && !use_committed);
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Dprintf2("RECON: row %d col %d failed to acquire floating rbuf\n",rbuf->row, rbuf->col);
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raidPtr->procsInBufWait++;
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if ( (raidPtr->procsInBufWait == raidPtr->numCol -1) && (raidPtr->numFullReconBuffers == 0)) {
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printf("Buffer wait deadlock detected. Exiting.\n");
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rf_PrintPSStatusTable(raidPtr, rbuf->row);
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RF_PANIC();
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}
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pssPtr->flags |= RF_PSS_BUFFERWAIT;
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cb = rf_AllocCallbackDesc(); /* append to buf wait list in recon ctrl structure */
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cb->row = rbuf->row; cb->col = rbuf->col;
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cb->callbackArg.v = rbuf->parityStripeID;
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cb->callbackArg2.v = rbuf->which_ru;
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cb->next = NULL;
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if (!reconCtrlPtr->bufferWaitList) reconCtrlPtr->bufferWaitList = cb;
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else { /* might want to maintain head/tail pointers here rather than search for end of list */
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for (p = reconCtrlPtr->bufferWaitList; p->next; p=p->next);
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p->next = cb;
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}
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retcode = 1;
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goto out;
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}
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Dprintf2("RECON: row %d col %d acquired rbuf\n",rbuf->row, rbuf->col);
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RF_ETIMER_STOP(raidPtr->recon_tracerecs[rbuf->col].recon_timer);
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RF_ETIMER_EVAL(raidPtr->recon_tracerecs[rbuf->col].recon_timer);
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raidPtr->recon_tracerecs[rbuf->col].specific.recon.recon_return_to_submit_us +=
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RF_ETIMER_VAL_US(raidPtr->recon_tracerecs[rbuf->col].recon_timer);
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RF_ETIMER_START(raidPtr->recon_tracerecs[rbuf->col].recon_timer);
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rf_LogTraceRec(raidPtr, &raidPtr->recon_tracerecs[rbuf->col]);
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/* initialize the buffer */
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if (t!=rbuf) {
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t->row = rbuf->row; t->col = reconCtrlPtr->fcol;
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t->parityStripeID = rbuf->parityStripeID;
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t->which_ru = rbuf->which_ru;
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t->failedDiskSectorOffset = rbuf->failedDiskSectorOffset;
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t->spRow=rbuf->spRow;
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t->spCol=rbuf->spCol;
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t->spOffset=rbuf->spOffset;
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ta = t->buffer; t->buffer = rbuf->buffer; rbuf->buffer = ta; /* swap buffers */
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}
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/* the first installation always gets installed as the destination buffer.
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* subsequent installations get stacked up to allow for multi-way XOR
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*/
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if (!pssPtr->rbuf) {pssPtr->rbuf = t; t->count = 1;}
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else pssPtr->rbufsForXor[ pssPtr->xorBufCount++ ] = t; /* install this buffer */
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rf_CheckForFullRbuf(raidPtr, reconCtrlPtr, pssPtr, layoutPtr->numDataCol); /* the buffer is full if G=2 */
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out:
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RF_UNLOCK_PSS_MUTEX( raidPtr,rbuf->row,rbuf->parityStripeID);
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RF_UNLOCK_MUTEX( reconCtrlPtr->rb_mutex );
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return(retcode);
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}
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int rf_MultiWayReconXor(raidPtr, pssPtr)
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RF_Raid_t *raidPtr;
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RF_ReconParityStripeStatus_t *pssPtr; /* the pss descriptor for this parity stripe */
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{
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int i, numBufs = pssPtr->xorBufCount;
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int numBytes = rf_RaidAddressToByte(raidPtr, raidPtr->Layout.sectorsPerStripeUnit * raidPtr->Layout.SUsPerRU);
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RF_ReconBuffer_t **rbufs = (RF_ReconBuffer_t **) pssPtr->rbufsForXor;
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RF_ReconBuffer_t *targetRbuf = (RF_ReconBuffer_t *) pssPtr->rbuf;
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RF_ASSERT(pssPtr->rbuf != NULL);
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RF_ASSERT(numBufs > 0 && numBufs < RF_PS_MAX_BUFS);
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#ifdef KERNEL
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#ifndef __NetBSD__
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thread_block(); /* yield the processor before doing a big XOR */
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#endif
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#endif /* KERNEL */
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/*
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* XXX
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*
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* What if more than 9 bufs?
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*/
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nWayXorFuncs[numBufs](pssPtr->rbufsForXor, targetRbuf, numBytes/sizeof(long));
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/* release all the reconstruction buffers except the last one, which belongs to the
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* the disk who's submission caused this XOR to take place
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*/
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for (i=0; i < numBufs-1; i++) {
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if (rbufs[i]->type == RF_RBUF_TYPE_FLOATING) rf_ReleaseFloatingReconBuffer(raidPtr, rbufs[i]->row, rbufs[i]);
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else if (rbufs[i]->type == RF_RBUF_TYPE_FORCED) rf_FreeReconBuffer(rbufs[i]);
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else RF_ASSERT(0);
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}
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targetRbuf->count += pssPtr->xorBufCount;
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pssPtr->xorBufCount = 0;
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return(0);
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}
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/* removes one full buffer from one of the full-buffer lists and returns it.
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*
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* ASSUMES THE RB_MUTEX IS UNLOCKED AT ENTRY.
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*/
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RF_ReconBuffer_t *rf_GetFullReconBuffer(reconCtrlPtr)
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RF_ReconCtrl_t *reconCtrlPtr;
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{
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RF_ReconBuffer_t *p;
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RF_LOCK_MUTEX(reconCtrlPtr->rb_mutex);
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if ( (p=reconCtrlPtr->priorityList) != NULL) {
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reconCtrlPtr->priorityList = p->next;
|
|
p->next = NULL;
|
|
goto out;
|
|
}
|
|
if ( (p=reconCtrlPtr->fullBufferList) != NULL) {
|
|
reconCtrlPtr->fullBufferList = p->next;
|
|
p->next = NULL;
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
RF_UNLOCK_MUTEX(reconCtrlPtr->rb_mutex);
|
|
return(p);
|
|
}
|
|
|
|
|
|
/* if the reconstruction buffer is full, move it to the full list, which is maintained
|
|
* sorted by failed disk sector offset
|
|
*
|
|
* ASSUMES THE RB_MUTEX IS LOCKED AT ENTRY.
|
|
*/
|
|
int rf_CheckForFullRbuf(raidPtr, reconCtrl, pssPtr, numDataCol)
|
|
RF_Raid_t *raidPtr;
|
|
RF_ReconCtrl_t *reconCtrl;
|
|
RF_ReconParityStripeStatus_t *pssPtr;
|
|
int numDataCol;
|
|
{
|
|
RF_ReconBuffer_t *p, *pt, *rbuf = (RF_ReconBuffer_t *) pssPtr->rbuf;
|
|
|
|
if (rbuf->count == numDataCol) {
|
|
raidPtr->numFullReconBuffers++;
|
|
Dprintf2("RECON: rbuf for psid %ld ru %d has filled\n",
|
|
(long)rbuf->parityStripeID, rbuf->which_ru);
|
|
if (!reconCtrl->fullBufferList || (rbuf->failedDiskSectorOffset < reconCtrl->fullBufferList->failedDiskSectorOffset)) {
|
|
Dprintf2("RECON: rbuf for psid %ld ru %d is head of list\n",
|
|
(long)rbuf->parityStripeID, rbuf->which_ru);
|
|
rbuf->next = reconCtrl->fullBufferList;
|
|
reconCtrl->fullBufferList = rbuf;
|
|
}
|
|
else {
|
|
for (pt = reconCtrl->fullBufferList, p = pt->next; p && p->failedDiskSectorOffset < rbuf->failedDiskSectorOffset; pt=p, p=p->next);
|
|
rbuf->next = p;
|
|
pt->next = rbuf;
|
|
Dprintf2("RECON: rbuf for psid %ld ru %d is in list\n",
|
|
(long)rbuf->parityStripeID, rbuf->which_ru);
|
|
}
|
|
#if 0
|
|
pssPtr->writeRbuf = pssPtr->rbuf; /* DEBUG ONLY: we like to be able to find this rbuf while it's awaiting write */
|
|
#else
|
|
rbuf->pssPtr = pssPtr;
|
|
#endif
|
|
pssPtr->rbuf = NULL;
|
|
rf_CauseReconEvent(raidPtr, rbuf->row, rbuf->col, NULL, RF_REVENT_BUFREADY);
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
|
|
/* release a floating recon buffer for someone else to use.
|
|
* assumes the rb_mutex is LOCKED at entry
|
|
*/
|
|
void rf_ReleaseFloatingReconBuffer(raidPtr, row, rbuf)
|
|
RF_Raid_t *raidPtr;
|
|
RF_RowCol_t row;
|
|
RF_ReconBuffer_t *rbuf;
|
|
{
|
|
RF_ReconCtrl_t *rcPtr = raidPtr->reconControl[row];
|
|
RF_CallbackDesc_t *cb;
|
|
|
|
Dprintf2("RECON: releasing rbuf for psid %ld ru %d\n",
|
|
(long)rbuf->parityStripeID, rbuf->which_ru);
|
|
|
|
/* if anyone is waiting on buffers, wake one of them up. They will subsequently wake up anyone
|
|
* else waiting on their RU
|
|
*/
|
|
if (rcPtr->bufferWaitList) {
|
|
rbuf->next = rcPtr->committedRbufs;
|
|
rcPtr->committedRbufs = rbuf;
|
|
cb = rcPtr->bufferWaitList;
|
|
rcPtr->bufferWaitList = cb->next;
|
|
rf_CauseReconEvent(raidPtr, cb->row, cb->col, (void *) 1, RF_REVENT_BUFCLEAR); /* arg==1 => we've committed a buffer */
|
|
rf_FreeCallbackDesc(cb);
|
|
raidPtr->procsInBufWait--;
|
|
} else {
|
|
rbuf->next = rcPtr->floatingRbufs;
|
|
rcPtr->floatingRbufs = rbuf;
|
|
}
|
|
}
|
|
|
|
/* release any disk that is waiting on a buffer for the indicated RU.
|
|
* assumes the rb_mutex is LOCKED at entry
|
|
*/
|
|
void rf_ReleaseBufferWaiters(raidPtr, pssPtr)
|
|
RF_Raid_t *raidPtr;
|
|
RF_ReconParityStripeStatus_t *pssPtr;
|
|
{
|
|
RF_CallbackDesc_t *cb1, *cb = pssPtr->bufWaitList;
|
|
|
|
Dprintf2("RECON: releasing buf waiters for psid %ld ru %d\n",
|
|
(long)pssPtr->parityStripeID, pssPtr->which_ru);
|
|
pssPtr->flags &= ~RF_PSS_BUFFERWAIT;
|
|
while (cb) {
|
|
cb1 = cb->next;
|
|
cb->next = NULL;
|
|
rf_CauseReconEvent(raidPtr, cb->row, cb->col, (void *) 0, RF_REVENT_BUFCLEAR); /* arg==0 => we haven't committed a buffer */
|
|
rf_FreeCallbackDesc(cb);
|
|
cb = cb1;
|
|
}
|
|
pssPtr->bufWaitList = NULL;
|
|
}
|
|
|
|
/* when reconstruction is forced on an RU, there may be some disks waiting to
|
|
* acquire a buffer for that RU. Since we allocate a new buffer as part of
|
|
* the forced-reconstruction process, we no longer have to wait for any
|
|
* buffers, so we wakeup any waiter that we find in the bufferWaitList
|
|
*
|
|
* assumes the rb_mutex is LOCKED at entry
|
|
*/
|
|
void rf_ReleaseBufferWaiter(rcPtr, rbuf)
|
|
RF_ReconCtrl_t *rcPtr;
|
|
RF_ReconBuffer_t *rbuf;
|
|
{
|
|
RF_CallbackDesc_t *cb, *cbt;
|
|
|
|
for (cbt = NULL, cb = rcPtr->bufferWaitList; cb; cbt = cb, cb=cb->next) {
|
|
if ( (cb->callbackArg.v == rbuf->parityStripeID) && ( cb->callbackArg2.v == rbuf->which_ru)) {
|
|
Dprintf2("RECON: Dropping row %d col %d from buffer wait list\n", cb->row, cb->col);
|
|
if (cbt) cbt->next = cb->next;
|
|
else rcPtr->bufferWaitList = cb->next;
|
|
rf_CauseReconEvent((RF_Raid_t *) rbuf->raidPtr, cb->row, cb->col, (void *) 0, RF_REVENT_BUFREADY); /* arg==0 => no committed buffer */
|
|
rf_FreeCallbackDesc(cb);
|
|
return;
|
|
}
|
|
}
|
|
}
|