rf_configure.c

RAIDFrame是个非常好的磁盘阵列RAID仿真工具

/*
 * 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  [e-mail]
 *  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_configure.c -- code related to configuring the raidframe system
 *
 * configuration is complicated by the fact that we want the same
 * driver to work both in the kernel and at user level.  In the
 * kernel, we can't read the configuration file, so we configure
 * by running a user-level program that reads the config file,
 * creates a data structure describing the configuration and
 * passes it into the kernel via an ioctl.  Since we want the config
 * code to be common between the two versions of the driver, we
 * configure using the same two-step process when running at
 * user level.  Of course, at user level, the config structure is
 * passed directly to the config routine, rather than via ioctl.
 *
 * This file is not compiled into the kernel, so we have no
 * need for KERNEL ifdefs.
 *
 **************************************************************/

/* $Locker:  $
 * $Log: rf_configure.c,v $
 * Revision 1.42  1996/08/09  18:47:47  jimz
 * major -> dev_major
 *
 * Revision 1.41  1996/07/29  14:05:12  jimz
 * fix numPUs/numRUs confusion (everything is now numRUs)
 * clean up some commenting, return values
 *
 * Revision 1.40  1996/07/27  23:36:08  jimz
 * Solaris port of simulator
 *
 * Revision 1.39  1996/07/27  18:39:45  jimz
 * cleanup sweep
 *
 * Revision 1.38  1996/07/18  22:57:14  jimz
 * port simulator to AIX
 *
 * Revision 1.37  1996/06/19  14:58:02  jimz
 * move layout-specific config parsing hooks into RF_LayoutSW_t
 * table in rf_layout.c
 *
 * Revision 1.36  1996/06/17  14:38:33  jimz
 * properly #if out RF_DEMO code
 * fix bug in MakeConfig that was causing weird behavior
 * in configuration routines (config was not zeroed at start)
 * clean up genplot handling of stacks
 *
 * Revision 1.35  1996/06/05  19:38:32  jimz
 * fixed up disk queueing types config
 * added sstf disk queueing
 * fixed exit bug on diskthreads (ref-ing bad mem)
 *
 * Revision 1.34  1996/06/03  23:28:26  jimz
 * more bugfixes
 * check in tree to sync for IPDS runs with current bugfixes
 * there still may be a problem with threads in the script test
 * getting I/Os stuck- not trivially reproducible (runs ~50 times
 * in a row without getting stuck)
 *
 * Revision 1.33  1996/06/02  17:31:48  jimz
 * Moved a lot of global stuff into array structure, where it belongs.
 * Fixed up paritylogging, pss modules in this manner. Some general
 * code cleanup. Removed lots of dead code, some dead files.
 *
 * Revision 1.32  1996/05/30  23:22:16  jimz
 * bugfixes of serialization, timing problems
 * more cleanup
 *
 * Revision 1.31  1996/05/30  11:29:41  jimz
 * Numerous bug fixes. Stripe lock release code disagreed with the taking code
 * about when stripes should be locked (I made it consistent: no parity, no lock)
 * There was a lot of extra serialization of I/Os which I've removed- a lot of
 * it was to calculate values for the cache code, which is no longer with us.
 * More types, function, macro cleanup. Added code to properly quiesce the array
 * on shutdown. Made a lot of stuff array-specific which was (bogusly) general
 * before. Fixed memory allocation, freeing bugs.
 *
 * Revision 1.30  1996/05/27  18:56:37  jimz
 * more code cleanup
 * better typing
 * compiles in all 3 environments
 *
 * Revision 1.29  1996/05/24  01:59:45  jimz
 * another checkpoint in code cleanup for release
 * time to sync kernel tree
 *
 * Revision 1.28  1996/05/18  19:51:34  jimz
 * major code cleanup- fix syntax, make some types consistent,
 * add prototypes, clean out dead code, et cetera
 *
 * Revision 1.27  1995/12/12  18:10:06  jimz
 * MIN -> RF_MIN, MAX -> RF_MAX, ASSERT -> RF_ASSERT
 * fix 80-column brain damage in comments
 *
 * Revision 1.26  1995/12/01  15:16:36  root
 * added copyright info
 *
 */

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "rf_raid.h"
#include "rf_raidframe.h"
#include "rf_debugMem.h"
#include "rf_utils.h"
#include "rf_general.h"
#include "rf_decluster.h"
#include "rf_configure.h"
#include "rf_sys.h"

static unsigned int dev_name2num(char *s);
static unsigned int osf_dev_name2num(char *s);
static int rf_search_file_for_start_of(char *string, char *buf, int len,
	FILE *fp);
static int rf_get_next_nonblank_line(char *buf, int len, FILE *fp,
	char *errmsg);

/* called from user level to read the configuration file and create
 * a configuration control structure.  This is used in the user-level
 * version of the driver, and in the user-level program that configures
 * the system via ioctl.
 */
int rf_MakeConfig(configname, cfgPtr)
  char         *configname;
  RF_Config_t  *cfgPtr;
{
  int numscanned, val, r, c, retcode, aa, bb, cc;
  char buf[256], buf1[256], *cp;
  RF_LayoutSW_t *lp;
  FILE *fp;

  bzero((char *)cfgPtr, sizeof(RF_Config_t));

  fp = fopen(configname, "r");
  if (!fp) {
    RF_ERRORMSG1("Can't open config file %s\n",configname);
    return(-1);
  }
  
  rewind(fp);
  if (rf_search_file_for_start_of("array", buf, 256, fp)) {
    RF_ERRORMSG1("Unable to find start of \"array\" params in config file %s\n",configname);
    retcode = -1; goto out;
  }
  rf_get_next_nonblank_line(buf, 256, fp, "Config file error (\"array\" section):  unable to get numRow and numCol\n");
  /*
   * wackiness with aa, bb, cc to get around size problems on different platforms
   */
  numscanned = sscanf(buf,"%d %d %d", &aa, &bb, &cc);
  if (numscanned != 3) {
    RF_ERRORMSG("Config file error (\"array\" section):  unable to get numRow, numCol, numSpare\n");
    retcode = -1; goto out;
  }
  cfgPtr->numRow = (RF_RowCol_t)aa;
  cfgPtr->numCol = (RF_RowCol_t)bb;
  cfgPtr->numSpare = (RF_RowCol_t)cc;

  /* debug section is optional */
  for (c=0; c<RF_MAXDBGV; c++)
    cfgPtr->debugVars[c][0] = '\0';
  rewind(fp);
  if (!rf_search_file_for_start_of("debug", buf, 256, fp)) {
    for (c=0; c < RF_MAXDBGV; c++) {
      if (rf_get_next_nonblank_line(buf, 256, fp, NULL)) break;
      cp = rf_find_non_white(buf);
      if (!strncmp(cp, "START", strlen("START"))) break;
      (void) strcpy(&cfgPtr->debugVars[c][0], cp);
    }
  }
  
  rewind(fp);
  strcpy(cfgPtr->diskQueueType,"fifo");
  cfgPtr->maxOutstandingDiskReqs = 1;
  /* scan the file for the block related to disk queues */
  if (rf_search_file_for_start_of("queue",buf,256,fp)) {
    RF_ERRORMSG2("[No disk queue discipline specified in config file %s.  Using %s.]\n",configname, cfgPtr->diskQueueType);
  } else {
    if (rf_get_next_nonblank_line(buf, 256, fp, NULL)) {
      RF_ERRORMSG2("[No disk queue discipline specified in config file %s.  Using %s.]\n",configname, cfgPtr->diskQueueType);
    }
  }

  /* the queue specifier line contains two entries:
   * 1st char of first word specifies queue to be used
   * 2nd word specifies max num reqs that can be outstanding on the disk itself (typically 1)
   */
  if (sscanf(buf,"%s %d",buf1,&val)!=2) {
    RF_ERRORMSG1("Can't determine queue type and/or max outstanding reqs from line: ",buf);
    RF_ERRORMSG2("Using %s-%d\n", cfgPtr->diskQueueType, cfgPtr->maxOutstandingDiskReqs);
  } else {
    char *c;
    bcopy(buf1, cfgPtr->diskQueueType, RF_MIN(sizeof(cfgPtr->diskQueueType), strlen(buf1)+1));
    for(c=buf1;*c;c++) {
      if (*c == ' ') {
        *c = '\0';
        break;
      }
    }
    cfgPtr->maxOutstandingDiskReqs = val;
  }

  rewind(fp);


  if (rf_search_file_for_start_of("disks",buf,256,fp)) {
    RF_ERRORMSG1("Can't find \"disks\" section in config file %s\n",configname);
    retcode = -1; goto out;
  }

  for (r=0; r<cfgPtr->numRow; r++) {
    for (c=0; c<cfgPtr->numCol; c++) {
      if (rf_get_next_nonblank_line(&cfgPtr->devnames[r][c][0], 50, fp, NULL)) {
	RF_ERRORMSG2("Config file error: unable to get device file for disk at row %d col %d\n",r,c);
	retcode = -1; goto out;
      }
#ifndef SIMULATE
      val = dev_name2num(&cfgPtr->devnames[r][c][0]);
      if (val < 0) {
	RF_ERRORMSG3("Config file error: can't get dev num (dev file '%s') for disk at row %d c %d\n",
		  &cfgPtr->devnames[r][c][0],r,c);
	retcode = -1; goto out;
      } else cfgPtr->devs[r][c] = val;
#endif /* !SIMULATE */
    }
  }

  /* "spare" section is optional */
  rewind(fp);
  if (rf_search_file_for_start_of("spare",buf,256,fp)) cfgPtr->numSpare =0;
  for (c = 0; c < cfgPtr->numSpare; c++) {
    if (rf_get_next_nonblank_line(&cfgPtr->spare_names[c][0], 256, fp, NULL)) {
      RF_ERRORMSG1("Config file error: unable to get device file for spare disk %d\n",c);
      retcode = -1; goto out;
    }
#ifndef SIMULATE
    val = dev_name2num(&cfgPtr->spare_names[c][0]);
    if (val < 0) {
      RF_ERRORMSG2("Config file error: can't get dev num (dev file '%s') for spare disk %d\n",
		&cfgPtr->spare_names[c][0],c);
      retcode = -1; goto out;
    } else cfgPtr->spare_devs[c] = val;
#endif /* !SIMULATE */
  }

  /* scan the file for the block related to layout */
  rewind(fp);
  if (rf_search_file_for_start_of("layout",buf,256,fp)) {
    RF_ERRORMSG1("Can't find \"layout\" section in configuration file %s\n",configname);
    retcode = -1; goto out;
  }
  if (rf_get_next_nonblank_line(buf, 256, fp, NULL)) {
    RF_ERRORMSG("Config file error (\"layout\" section): unable to find common layout param line\n");
    retcode = -1; goto out;