dt.c

Linux磁盘测试的源代码,测试磁盘的读写性能

 * July 22, 1995 by Robin Miller.
 *	Add additional checking on "pattern=string" to avoid ambiguity
 *	with 4-byte hex data pattern strings... which is misleading).
 *
 * July 15, 1995 by Robin Miller.
 *	Add "oncerr=action" option to control child process
 *	error processing.
 *
 * July 7, 1995 by Robin Miller.
 *	Add "dlimit=value" option to override default dump limit.
 *
 * July 6, 1995 by Robin Miller.
 *	Enable dumping of data bytes on compare errors by default,
 *	since this program is used mainly as a diagnostic tool, and
 *	we now limit the number of bytes dumped.
 *
 * November 5, 1994 by Robin Miller.
 *	Don't set SIGCHLD signal to SIG_IGN (set to SIG_DFL) or else
 *	waitpid() won't detect any child processes (OSF R1.3 and QNX).
 *
 * September 23, 1994 by Robin Miller.
 *      Make changes necessary to build on QNX 4.21 release.  This
 *      required changing O_DSYNCH to O_DSYNC, and O_FSYNCH to O_SYNC.
 *
 * November 11, 1993 by Robin Miller.
 *	Removed code which was inadvertantly disabling data compares
 *	when there was no output file and verify was disabled.  This
 *	caused data comparisions to be disabled for terminal devices,
 *	now that the code has been rewritten/restructured (shit!!!).
 *
 * October 31, 1993 by Robin Miller.
 *	Enhance device type setup and honor user specified device type.
 *
 * October 28, 1993 by Robin Miller.
 *	Correct problem during loopback testing, where the device info
 *	structure fd's were not marked closed due to two places where
 *	close() was called directly (oops, missed a couple changes).
 *	After forking, display which process is the reader and writer.
 *
 * October 11, 1993 by Robin Miller.
 *	Conditionalize SunOS code (4.1.2 used) to avoid using strerror()
 *	function for obtaining error messages (return to perror() method).
 *
 * October 7, 1993 by Robin Miller.
 *	Add appropriate casting to block size checking, use ssize_t to
 *	prevent negative block sizes which don't work with read & write
 *	system calls (even though the count arg is declared as size_t).
 *
 * September 16, 1993 by Robin Miller.
 *	Properly report write pass count when read verify is disabled.
 *	Only update data pattern when writing files or loopback enabled
 *	when multiple passes specified (pattern cannot change for reads).
 *	Support "enable=loop" to enable loopback operation, rather than
 *	requiring both the same input & output devices (need only one).
 *	Added "oflags={append,sync}" for DEC OSF/1 systems (write opts).
 *
 * September 15, 1993 by Robin Miller.
 *	Added additional check for FIFO's prior to opening the device
 *	since O_NONBLOCK flag must be set to keep open() from blocking.
 *
 * September 8, 1993 by Robin Miller.
 *	Moved generic test functions into file dtgen.c.
 *
 * September 7, 1993 by Robin Miller.
 *	Moved tty specific code into dttty.c.  This code is dispatched
 *	to automatically after being setup in the device info structure.
 *
 * September 4, 1993 by Robin Miller.
 *	Lots of restructuring & code cleanup.  Nearly all testing is
 *	now appropriately parameterized (helps speed & new tests).
 *
 * September 3, 1993 by Robin Miller.
 *	Dispatch to test functions via function lookup table in
 *	preparation for device specific tests.
 *
 * September 1, 1993 by Robin Miller.
 *	Added "min=value", "max=value", and "incr=value" options for
 *	testing variable length records (mainly for tape devices).
 *
 * August 31, 1993 by Robin Miller.
 *	Added "align=rotate" option to rotate the starting data buffer
 *	address through sizeof(ptr) to force unaligned buffer accesses.
 *	This feature tests special handling of unaligned DMA addresses.
 *	Added "pattern=incr" option to use incrementing data pattern.
 *
 * August 27, 1993 by Robin MIller.
 *	Added support for DEC OSF/1 POSIX Asynchronous I/O (AIO).
 *
 * August 20, 1993 by Robin Miller.
 *	Added handling of reading & writing multiple tape files.
 *
 * August 18, 1993 by Robin Miller.
 *	Added "step=" option to specify a step offset for seeks.
 *	This is the number of bytes stepped after an I/O request.
 *
 * August 17, 1993 by Robin Miller.
 *	Added reporting of start & end times, time of errors, and
 *	added "runtime=" option to specify how long to run.
 *
 * August 13, 1993 by Robin Miller.
 *	Added alternate data patterns to use with multiple passes.
 *
 * August 5, 1993 by Robin Miller.
 *	Added "files=value" option for processing tape files.
 *
 * August 3, 1993 by Robin Miller.
 *	Added "procs=value" option to create multiple processes.
 *
 * September 19, 1992 by Robin Miller.
 *	Initialize flush_flag to TRUE so flushing of tty I/O queues
 *	gets done by default to discard any left over junk.
 * 
 * September 18, 1992 by Robin Miller.
 *	Added calls to save & restore terminal characteristics.
 *
 * September 17, 1992 by Robin Miller.
 *	Added parsing for "pattern=string" to allow ASCII string.
 *
 * September 12, 1992 by Robin Miller.
 *	Ensure the stderr stream is fully buffered, so the total time
 *	is not affected by flushing previous statistics.
 *
 * September 11, 1992 by Robin Miller.
 *	Added "oflags={cache,dsync,fsync,temp}" options to allow testing
 *	the affect of these open flags on QNX systems.
 *
 * September 10, 1992 by Robin Miller.
 *	Added parsing of MARK & SPACE parity for QNX Operating System.
 *
 * September 9, 1992 by Robin Miller.
 *	Allow loopback to same tty port (avoid exclusive open).
 *
 * September 5, 1992 by Robin Miller.
 *	Initial port to QNX 4.1 Operating System.
 *
 * September 3, 1992 by Robin Miller.
 *	Make changes necessary to remove BSD dependencies.
 *
 * August 19, 1992 by Robin Miller.
 *	Added support for testing tty modem control.
 *
 * May 25, 1992 by Robin Miller.
 *	Don't set exclusive open mode for terminal device if debug is
 *	enabled, so "stty -a" can be done on terminal under test.
 *
 * May 22, 1992 by Robin Miller.
 *	Control / force kernel address data exception via flag.
 *	Added option "enable=ade" (address data exception).
 *
 * April 24, 1992 by Robin Miller.
 *	Inform user that either a record count or a data limit must be
 *	specified.  Added flags to determine if we are reading stdin or
 *	writing to stdout streams.
 *
 * March 11, 1992 by Robin Miller.
 *	Changes necessary for port to 64-bit Alpha architecture.
 *
 * October 16, 1990 by Robin Miller.
 *	Added "align=offset" option to align memory buffers at a specific
 *	offset.  The default is page aligned.
 *
 * October 9, 1990 by Robin Miller.
 *	Added "hz=ticks" option to allow the ticks per second value to
 *	be specified.  On VAX systems, this is consistent (100), but on
 *	MIPS systems it various and is setup at boot time in the machine
 *	dependent code.
 *
 * August 21, 1990 by Robin Miller.
 *	Changed exit status so scripts can detect and handle errors
 *	based on the exit code.  If not success, fatal error, or end
 *	of file/tape, the exit code is the error number (errno).
 *
 * August 21, 1990 by Robin Miller.
 *	Added "position=offset" option to position to specified offset
 *	before starting test.
 *
 * August 16, 1990 by Robin Miller.
 *	Added "enable=coredump" option so if exiting with error status,
 *	we'll generate a core dump for analysis purposes.
 *
 * August 8, 1990 by Robin Miller.
 *	Changed malloc() to valloc() to align buffer on page boundry.
 *	On some archetectures, this results on better performance to
 *	raw devices since the DMA is done directly to the users' buffer.
 *
 * August 2, 1990 by Robin Miller.
 *	Added "pf=file" to specify a pattern file to use.  In this
 *	case, the contents of the specified file are used for the
 *	data pattern.
 *
 * April 11, 1990 by Robin Miller.
 *	Added "enable=mmap" option to enable memory mapped I/O.
 *
 * March 22, 1990 by Robin Miller.
 *	Added "dispose={delete|keep}" option to control deleting the
 *	output file at the end of testing.  "delete" is the default
 *	action, to avoid leaving test files around.
 *
 * Novemeber 9, 1989 by Robin Miller.
 *	Add additional delay commands (cdelay=, rdelay=, wdelay=) to
 *	help with testing and debugging various devices.  These aren't
 *	normally enabled and don't appear in the help section.
 *
 * Novemeber 6, 1989 by Robin Miller.
 *	Allow start delay (sdelay=) and end delay (edelay=) to be used
 *	with any device, not just terminals.  The parallel output device
 *	needs an end delay to allow the parallel input device to reopen
 *	during multiple passes (can't disable cycle request).
 *
 * November 3, 1989 by Robin Miller.
 *	Change open mode for output files from read/write (O_RDWR) to
 *	write only (O_WRONLY) so write only devices can be tested.
 *
 * October 16, 1989 by Robin Miller.
 *	Made flushing of input queue before testing optional via
 *	the "enable=flush" command.  This caused a timing problem
 *	where occasionally the writer started before the reader.
 *
 * October 4, 1989 by Robin Miller.
 *	Added fsync() system call to force in-core buffers to disk
 *	before reporting statistics after writing the file.
 *
 * September 27, 1989 by Robin Miller.
 *	Display statistics at end of each read/write pass by default.
 *	Added enable/disable=pstats to control end of pass statistics.
 *	Added enable/disable=compare to control data comparisions.
 *
 * September 18, 1989 by Robin Miller.
 *	Allow both an input and an output device to be specified.
 *	This was done mainly for terminal devices so a child could
 *	be forked to allow proper synchronization.
 *
 * July 25, 1989 by Robin Miller.
 *	Added support for testing terminal ports.  New options are:
 *		speed=, timeout=, parity=, flow=, sdelay=, edelay=
 *
 * January 25, 1989 by Robin Miller.
 *	Added reporting of pass statistics if debugging is enabled
 *	so write/read elapsed times can be determined.
 *
 * December 8, 1988 by Robin Miller.
 *	Added catching of software terminate signal (SIGTERM) so the
 *	final statistics will be displayed before exiting.
 */

#if defined(ultrix) || defined(sun)
extern int sys_nerr;
extern char *sys_errlist[];
#endif /* defined(sun) */

/*
 * Forward References:
 */
static u_long number(int base);		/* Numeric conversion function.	*/
static large_t large_number(int base);	/* Large numeric conversions.	*/
void parse_args(int argc, char **argv);
static time_t time_value(void);		/* Time conversion function.	*/

/*
 * Variable Declarations:
 */
#if !defined(AIO)
int	aio_bufs = 0; /* Normally declared in dtaio.c, but for parsing. */
#endif /* !defined(AIO) */

#if defined(MUNSA)
bool	munsa_flag = FALSE;		/* if TRUE enable MUNSA features*/
dlm_lock_mode_t  munsa_lock_type = DLM_NLMODE; /* default munsa lock type*/
dlm_lock_mode_t  input_munsa_lock_type = DLM_PRMODE; /* lock for input file*/
dlm_lock_mode_t  output_munsa_lock_type = DLM_PWMODE; /* lock for output file*/
char	     *resnam;
int	     resnlen, i;
dlm_lkid_t   lkid;
dlm_status_t l_stat;
dlm_nsp_t    nsp;
#endif /* defined(MUNSA) */

u_int32 pattern = DEFAULT_PATTERN;	/* Default data pattern.	*/
bool	user_pattern = FALSE;		/* Flags user specified pattern	*/
bool	unique_pattern = TRUE;		/* Unique pattern per process.	*/
char	*pattern_string;		/* Pointer to pattern string.	*/
char	*prefix_string;			/* User defined prefix string.	*/

bool	aio_flag = FALSE;		/* Asynchronous I/O (AIO) flag.	*/
int	align_offset = 0;		/* Align buffer at this offset.	*/
#if defined(TTY)
speed_t	baud_rate;			/* The user selected baud rate.	*/
#endif /* defined(TTY) */
size_t	block_size = BLOCK_SIZE;	/* Default block size to use.	*/
size_t	data_size;			/* Data buffer size + pad bytes	*/
size_t	dump_limit = 64;		/* The dump buffer data limit.	*/
u_int32	device_size = 0;		/* Default device block size.	*/
pid_t	child_pid;			/* For the child process ID.	*/
bool	bypass_flag = FALSE;		/* Bypass (some) sanity checks.	*/
bool	cerrors_flag = TRUE;		/* Report device close errors.	*/
bool	compare_flag = TRUE;		/* Controls data comparisions.	*/
bool	core_dump = FALSE;		/* Generate core dump on errors	*/
bool	debug_flag = FALSE;		/* Enable debug output flag.	*/
bool	Debug_flag = FALSE;		/* Verbose debug output flag.	*/
bool	eDebugFlag = FALSE;		/* End of file debug flag.	*/
bool	rDebugFlag = FALSE;		/* Random (seek) debug flag.	*/
bool	dump_flag = TRUE;		/* Dump data buffer on errors.	*/
#if defined(EEI)
bool	eei_flag = TRUE;		/* Extended Error Information.	*/
bool	eei_resets = FALSE;		/* Handle device reset errors.	*/
#endif /* defined(EEI) */
v_bool	end_of_file = FALSE;		/* End of file detected.	*/
#if defined(_NT_SOURCE)
/*
 * This workaround is being added for our Tcl/Tk test scripts.
 * The Windows TclX wait{} procedure, isn't returning exit status!
 */
bool	eof_status = FALSE;		/* Controls EOF exit status.	*/
#else /* !defined(_NT_SOURCE) */
bool	eof_status = TRUE;		/* Controls EOF exit status.	*/
#endif /* defined(_NT_SOURCE) */
vu_long	error_count;			/* Number of errors detected.	*/
u_long	error_limit = 1;		/* Number of errors tolerated.	*/
int	exit_status = SUCCESS;		/* Normal success exit status.	*/
u_long	file_limit;			/* # of tape files to process.	*/
bool	forked_flag = FALSE;		/* Forked child process flag.	*/
bool	fsync_flag = UNINITIALIZED;	/* fsync() after writes flag.	*/
off_t	file_position;			/* File position to lseek to.	*/
off_t	last_position;			/* Last position lseeked to.	*/
off_t	step_offset;			/* Step offset for disk seeks.	*/
bool	flush_flag = TRUE;		/* Flush tty input/output queue	*/
bool	keep_existing = TRUE;		/* Don't delete existing files.	*/
bool	header_flag = TRUE;		/* The log file header flag.	*/
bool	hazard_flag = FALSE;		/* Emit Hazard RPCLOGn: prefix.	*/
bool	user_incr = FALSE;		/* User specified incr count.	*/
bool	user_min = FALSE;		/* User specified min size.	*/
bool	user_max = FALSE;		/* User specified max size.	*/
size_t	incr_count;			/* Record increment byte count.	*/
size_t	min_size;			/* The minimum record size.	*/
size_t	max_size;			/* The maximum record size.	*/
bool	lbdata_flag = FALSE;		/* Logical block data flag.	*/
u_int32	lbdata_addr = 0;		/* Starting logical block addr.	*/
size_t	lbdata_size = 0;		/* Logical block data size.	*/
bool	user_lbdata = FALSE;		/* User specified starting lba.	*/
bool	user_lbsize = FALSE;		/* User specified lbdata size.	*/
bool	user_position = FALSE;		/* User specified file position.*/
bool	incr_pattern = FALSE;		/* Incrementing data pattern.	*/
bool	iot_pattern = FALSE;		/* IOT test pattern selected.	*/
bool	logdiag_flag = FALSE;		/* Log diagnostic messages.	*/
bool	loopback = FALSE;		/* Loopback to the same device.	*/
bool	micro_flag = FALSE;		/* Controls micro-second delay.	*/
bool	mmap_flag = FALSE;		/* Do memory mapped file I/O.	*/
#if defined(TTY)
bool	modem_flag = FALSE;		/* Testing tty modem control.	*/
#endif /* defined(TTY) */
bool	media_changed = FALSE;		/* Shows when media changed.	*/
bool	multi_flag = FALSE;		/* Multi-volume media flag.	*/
v_int	multi_volume = 1;		/* Multi-volume media count.	*/
int	open_flags = 0;			/* Common file open flags.	*/
int	wopen_flags = 0;		/* Additional write open flags.	*/
int	ropen_mode = O_RDONLY;		/* The read open mode to use.	*/
int	wopen_mode = O_WRONLY;		/* The write open mode to use.	*/
bool	pad_check = TRUE;		/* Check data buffer pad bytes.	*/
bool	spad_check = FALSE;		/* Check short record pad bytes.*/
u_long	pass_count;			/* Number of passes completed.	*/
u_long	pass_limit = 1UL;		/* Default number of passes.	*/
u_long	skip_count;			/* # of input record to skip.	*/
u_long	seek_count;			/* # of output records to seek.	*/
large_t	record_limit;			/* Max # of records to process.	*/
vu_long records_processed;		/* # of full records processed.	*/