dt.c

Linux磁盘测试的源代码,测试磁盘的读写性能

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 *			  COPYRIGHT (c) 1990 - 2004			    *
 *			   This Software Provided			    *
 *				     By					    *
 *			  Robin's Nest Software Inc.			    *
 *									    *
 * Permission to use, copy, modify, distribute and sell this software and   *
 * its documentation for any purpose and without fee is hereby granted,	    *
 * provided that the above copyright notice appear in all copies and that   *
 * both that copyright notice and this permission notice appear in the	    *
 * supporting documentation, and that the name of the author not be used    *
 * in advertising or publicity pertaining to distribution of the software   *
 * without specific, written prior permission.				    *
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 * NO EVENT SHALL HE BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL   *
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 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS  *
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF   *
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 ****************************************************************************/
/*
 * Module:	dt.c
 * Author:	Robin T. Miller
 *
 * Description:
 *	Main line code for generic data test program 'dt'.
 */
#include "dt.h"
#include <ctype.h>
#include <fcntl.h>
#include <math.h>
#include <signal.h>
#if !defined(_QNX_SOURCE)
#  if !defined(sun)
#    include <sys/ioctl.h>
#  endif /* !defined(sun) */
#  include <sys/file.h>
#  include <sys/param.h>
#  if defined(sun) || defined(_OSF_SOURCE)
#    include <sys/mman.h>
#  endif /* defined(sun) || defined(_OSF_SOURCE) */
#endif /* !defined(_QNX_SOURCE) */
#include <sys/wait.h>
#if defined(DEC)
#  include <sys/utsname.h>
#endif /* defined(DEC) */

/*
 * Modification History:
 *
 * February 27th, 2004 by Robin Miller.
 *       Switch ctime() to ctime_r() in preparation for threads.
 *
 * February 24th, 2004 by Robin Miller.
 *      Allow parsing of aios=0, to ease supporting of OS's which
 * don't support POSIX AIO.  Makes script writing a little simpler.
 *
 * December 6th, 2003 by Robin Miller.
 *      Conditionalize to exclude tty code.
 *
 * November 17th, 2003 by Robin Miller.
 *	Breakup output to stdout or stderr, rather than writing
 * all output to stderr.  If output file is stdout ('-') or a log
 * file is specified, then all output reverts to stderr.
 *	Parse AIO options, but then emit warning if not supported.
 * This allows portable scripts to be written without parameterizing
 * exlusion of AIO if a platform (OS) does not support it.
 *
 * October 31st, 2003 by Robin Miller.
 *	In terminate(), don't attempt flush if device or file is
 * not open when we receive the alarm signal.
 *
 * September 27th, 2003 by Robin Miller.
 *	Added support for AIX.
 *
 * June 9th, 2003 by Robin Miller.
 *	When terminating as result of alarm, flush output data if we
 * were writing a file.  Thanks to Hank Jakiela for reporting this.
 *
 * March 20th, 2003 by Robin Miller.
 *	Fix bug or'ing O_LARGEFILE into open flags (thanks Kris Corwin!).
 *
 * March 15th, 2003 by Robin Miller.
 *	Added "prefix=" option to support data pattern prefix string.
 *
 * March 14th, 2003 by Robin Miller.
 *	Added "slice=" option to support testing an individual slice.
 *
 * February 23rd, 2002 by Robin Miller.
 *      Make porting changes for HP-UX IA64.
 *
 * May 31st, 2001 by Robin Miller.
 *	Don't allow different data patterns with multiple processes,
 * unless writing to a regular file (each process has own filename).
 *
 * April 13th, 2001 by Robin Miller.
 *	Added "capacity=max" for Tru64 Unix, this will force using the
 * driver returned media capacity.  Prevents lseek/read algorithm when
 * using random I/O too!  Note:  Will inhibit disk driver EOM testing.
 *
 * February 24th, 2001 by Robin Miller.
 *	Add conditionalization for QNX RTP (Neutrino).
 *
 * February 21st, 2001 by Robin Miller.
 *	Disable EOF/EOM exit status by default.  This causes trouble for
 * normal testers.  Use "enable=eof" to reenable previous behaviour.
 *
 * February 6th, 2001 by Robin Miller.
 *	If input file and multiple slices, allow cycling through data
 * patterns, since the file is expected to have been written with unique
 * patterns in each slice region.  Minor update to deleting files too.
 *
 * February 3rd, 2001 by Robin Miller.
 *	Lift restriction of bs= or min= sizes being smaller than
 * sizeof(u_int32) for IOT pattern or lbdata option.  Although this
 * isn't *really* correct, enforcing this breaks numerious scripts.
 * Although smaller works, it's only by luck and the fact we have
 * pad bytes at EOB, which prvented data corruption in the past!
 *
 * January 28th, 2001 by Robin Miller.
 *	Added "slices=value" and "enable/disable=unique" options.
 * The slices option carves up a disk with each process exercising a
 * differnent range of blocks.  The unique pattern option sets up a
 * unique pattern for each process started for slices & regular files.
 *
 * January 26th, 2001 by Robin Miller.
 *	Added report_record() to the report record information.
 *	Added "iodir={forward,reverse}" option to all reverse I/O
 * to rotating media.  Add validation checks both before and after
 * a device is open (mostly random/reverse I/O checks).
 *
 * January 24th, 2001 by Robin Miller.
 *	Added "dsize=value" to set the device block size.
 *	Added "incr=var" option for variable request sizes.
 *	Removed some dead code (#if 0 stuff), to cleanup a bit.
 *	Updates to allow the IOT pattern to use non-modulo 512 byte
 * sizes.  The logic is: 1) user defined "lbs=value", 2) device block
 * size (Tru64 Unix), or 3) default to 512 byte block (original default).
 * This change was initiated by Windows/NT IOT disc using 2KB sector size.
 *
 * January 18th, 2001 by Robin Miller.
 *	When requesting multiple volumes, ensure the tape device gets
 * closed prior to retries, if the rewind operation fails.  Otherwise,
 * the next tape open fails with EBUSY (exclusive open device).
 *
 * January 14th, 2001 by Robin Miller.
 *	Added support for multiple volumes option.
 *
 * December 30th, 2000 by Robin Miller.
 *	Make changes to build using MKS/NuTCracker product.
 *
 * November 19th, 2000 by Robin Miller.
 *	Add missing enable/disable=fsync goto label statements.
 *
 * November 10th, 2000 by Robin Miller.
 *	Added sanity check to warn user about unpredictable results
 * when writing to a disk with multiple procs and multiple passes.
 *
 * November 8th, 2000 by Robin Miller.
 *	Added "disable=cerrors" to disable device close errors.
 * [ Note: This is really a workaround for the Linux tape driver. ]
 *	In HandleMultiVolume(), if closing the device fails, then
 * return that failure to abort the test.  With tapes, this means
 * flushing the buffered data or writing filemarks has failed.
 *
 * October 2nd, 2000 by Robin Miller.
 *	Enhanced report_error() to display errno value (same as Scu).
 *
 * August 22nd, 2000 by Robin Miller.
 *	Added boolean flags to track user set min, max, & incr values.
 *
 * July 14th, 2000 by Robin Miller.
 *	Added fsync_flag to control sync'ing data to disk files.
 *
 * May 8th, 2000 by Robin Miller.
 *	Adding parsing of "version" option, which is used to only
 * display the version string, dtversion() in file dtusage.c
 *
 * May 5th, 2000 by Robin Miller.
 *	Set proper exit code in terminate(), when exiting due to
 * an alarm, i.e., runtime= option.  Previously, the end of file
 * exit status was being ignored and we exited with failure status.
 *
 * April 25th, 2000 by Robin Miller.
 *	Fix problem of not breaking out of test loop if the error
 * limit has been reached on previous pass.
 *
 * March 28th, 2000 by Robin Miller.
 *	Modify "position=value" to accept a large numeric value,
 * otherwise we were limited to 32 bit value on non-64bit systems.
 * Do the same thing for "step=value" for 64-bit file offsets.
 * When using the "runtime=" option, when the alarm expires and
 * we call terminate() to exit, look at the exit_status variable
 * instead of error_count for errors, so we don't miss errors!
 *
 * March 27th, 2000 by Robin Miller.
 *   o	Fixed parsing of a couple flags, including "flags=direct".
 *   o	Added "capacity=value" option to set the drive capacity.
 *
 * March 20th, 2000 by Robin Miller.
 *	Don't allow a pass limit of zero.  This also avoids a
 * core dump when preparing statistics, since the active device
 * never got setup.
 *
 * March 2nd, 2000 by Robin Miller.
 *	In HandleMultiVolume(), reset the exit status to SUCCESS,
 * since this got set to END_OF_FILE earlier.  Failure to do this
 * means we exit with an END_OF_FILE (254) status (no good :-).
 *
 * February 17th, 2000 by Robin Miller.
 *	Adding better support for multi-volume tape testing.
 *
 * January 17th, 2000 by Robin Miller.
 *	In copy mode, is input file is stdin, don't do verify.
 *	Enable random I/O, for ralign, rlimit, or rseed options.
 *
 * January 14th, 2000 by Robin Miller.
 *	Don't delete the output file unless we're in test mode.
 *
 * January 6th, 2000 by Robin Miller.
 *	Added support for multi-volume media (lot's of changes).
 *
 * January 1st, 2000 by Robin Miller.
 *	Added read after write support, "enable=raw" option.
 *
 * December 31st, 1999 by Robin Miller.
 *	Added "rseed=" option, so user can specify the random seed.
 *	Modify reopen_file logic to use O_RDWR if skip_count exists.
 *
 * November 11th, 1999 by Robin Miller.
 *	Added logging of diagnostic information to event logger.
 *
 * November 10th. 1999 by Robin Miller.
 *	Fixed parsing of "dispose=delete".
 *
 * November 9th, 1999 by Robin Miller.
 *	Modify logic associated with making stderr stream buffered.
 *
 * August 26th, 1999 by Robin Miller.
 *	If during the write pass no data was transferred, don't do
 * the read pass since obviously this will result in a compare error.
 *
 * August 7th, 1999 by Robin Miller.
 *	Allow enabling open w/O_LARGEFILE via "flags=large", incase
 * _FILE_OFFSET_BITS=64 does _not_ enable this by default.
 *
 * July 22nd, 1999 by Robin Miller.
 *	Added support for IOT (DJ's) test pattern.
 * 
 * July 19th, 1999 by Robin Miller.
 *	Add flag to control log file header normally displayed.
 *
 * June 28, 1999 by Robin Miller.
 *	For 32-bit systems, change count and limit variables from
 * u_long to double, since u_long limits us to 4GB (too small).
 *
 * May 27, 1999 by Robin Miller.
 *	Merge in Goerge Bittner's changes for micro-second delays.
 *	Conditionalized all common/output file open flags.
 *
 * April 8, 1999 by Robin Miller.
 *	Merge in Jeff Detjen's changes for table()/sysinfo timing.
 *
 * April 7, 1999 by Robin Miller.
 *	On DEC systems, obtain tick/second via sysconf(_SC_CLK_TCK).
 *
 * December 21, 1998 by Robin Miller.
 *	Add pasing of "enable=resets", which enables tape repositioning
 * logic when bus/device resets are detected by DUNIX EEI status codes.
 *
 * December 19, 1998 by Robin Miller.
 *	- Disable setbuf() for stderr... screws up log files.
 *	- Write cmd line and version to log file for reference.
 *
 * December 16, 1998 by Robin Miller.
 *	Merge in changes made by George Bittner:
 *	- set random_seed using times() instead of time(0).
 *	- remove DLM_VALB, per Dan Christians' recommendation.
 *
 * October 29, 1998 by Robin Miller.
 *	Implement a random I/O data limit, instead of using the normal
 * data limit variable (not good to dual purpose this value).
 *
 * October 22, 1998 by Robin Miller. (Happy Birthday Mom!)
 *	When specifying a runtime, ensure we break out of the
 * passes loop if we exceed the error limit.  Previously, we'd
 * loop (possibly with error) for the duration of runtime :-)
 *
 * June 16, 1998 by Robin Miller.
 *	Add common open "flags={excl,ndelay,nonblock,rsync}".
 *	Add output (write) open "oflags={defer,dsync,trunc}".
 *
 * April 29, 1998 by Robin Miller.
 *	Add support for an alternate device directory.
 *
 * April 7, 1998 by Robin Miller.
 *	Setup the pattern as a pattern string, so non-modulo
 *	sizeof(pattern) read counts will data compare properly.
 *
 * March 20, 1998 by Robin Miller.
 *	When terminating, call close function before reporting stats,
 *	since in the case of AIO the I/O rundown updates statistics
 *	with outstanding requests, when we're aborted by a signal.
 *
 * May 14, 1997 by Robin Miller.
 *	In report_error(), set exit value to FAILURE instead of errno
 *	since this makes detecting errors easier in scripts.
 *
 * May 13, 1997 by Robin Miller.
 *	If a "skip=" count is specified with an output file "of=",
 *	open the file for R/W access since skips are accompished via
 *	read()'s of record size.
 *
 * March 27, 1997 by Ali Eghlima.
 *      Added cluster support, so more than one process or one system
 *      can access a resource. dlm are being used to synchronize all
 *      access.
 * 
 * March 7, 1997 by Robin Miller.
 *	If a copy or verify operation is selected, and a data limit
 *	is specified, then double the data limit to account for double
 *	the I/O's.  Previously, only half of the desired data limit was
 *	copied and/or verified.
 *
 * February 3, 1997 by Robin Miller.
 *	Check status from closing file descriptor, and if it's not
 *	SUCCESS, use this for the exit status.  For tapes, deferred
 *	writes and failure to write file marks occur at close time.
 *
 * March 30, 1996 by Robin Miller.
 *	When writing, now default to an infinite record limit, so
 *	writes stop when EOF is reached (disks and tapes only).
 *
 * February 29, 1996 by Robin Miller.
 *	Added callouts to setup data limit for disk random I/O.
 *
 * February 28, 1996 by Robin Miller.
 *	Added support for copying and verifying device/files.
 *
 * February 17, 1996 by Robin Miller.
 *	Add "enable=spad" option to control checking of pad bytes
 *	when long reads of short records is performed, since some
 *	controllers corrupt data bytes following the short record.
 *	[ NOTE:  At DEC, this action was deemed acceptable, since
 *	  the requester stated the driver could trash a larger buf. ]
 *
 * December 6, 1995 by Robin Miller.
 *	Add "ttymin=value" option to give user control over tty VMIN.
 *
 * November 19, 1995 by Robin Miller.
 *	When the device type is a disk, default min_size & incr_count to
 *	BLOCK_SIZE (512) instead of 1 (which is non-modulo for disks).
 *
 * November 18, 1995 by Robin Miller.
 *	Removing unaligned data access (ade) test code (code cleanup).
 *
 * July 24, 1995 by Robin Miller.
 *	Changed O_NDELAY to O_NONBLOCK which is defined by POSIX.  They are
 *	supposed to do the same thing, but they _do_ have different values.
 *	[ NOTE: This is only used for serial line modem testing. ]
 *