os0file.c 100 KB
Newer Older
1 2 3 4 5 6 7 8 9 10
/******************************************************
The interface to the operating system file i/o primitives

(c) 1995 Innobase Oy

Created 10/21/1995 Heikki Tuuri
*******************************************************/

#include "os0file.h"
#include "os0sync.h"
unknown's avatar
unknown committed
11
#include "os0thread.h"
12
#include "ut0mem.h"
13
#include "srv0srv.h"
unknown's avatar
unknown committed
14
#include "srv0start.h"
15
#include "fil0fil.h"
unknown's avatar
unknown committed
16
#include "buf0buf.h"
17

18
#undef HAVE_FDATASYNC
19 20 21 22 23 24 25

#ifdef POSIX_ASYNC_IO
/* We assume in this case that the OS has standard Posix aio (at least SunOS
2.6, HP-UX 11i and AIX 4.3 have) */

#endif

unknown's avatar
unknown committed
26
/* This specifies the file permissions InnoDB uses when it creates files in
unknown's avatar
unknown committed
27 28 29 30 31 32 33 34 35
Unix; the value of os_innodb_umask is initialized in ha_innodb.cc to
my_umask */

#ifndef __WIN__
ulint	os_innodb_umask		= S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP;
#else
ulint	os_innodb_umask		= 0;
#endif

unknown's avatar
unknown committed
36
/* If the following is set to TRUE, we do not call os_file_flush in every
unknown's avatar
unknown committed
37
os_file_write. We can set this TRUE when the doublewrite buffer is used. */
unknown's avatar
unknown committed
38 39
ibool	os_do_not_call_flush_at_each_write	= FALSE;

40 41 42 43 44 45
/* We use these mutexes to protect lseek + file i/o operation, if the
OS does not provide an atomic pread or pwrite, or similar */
#define OS_FILE_N_SEEK_MUTEXES	16
os_mutex_t	os_file_seek_mutexes[OS_FILE_N_SEEK_MUTEXES];

/* In simulated aio, merge at most this many consecutive i/os */
unknown's avatar
unknown committed
46
#define OS_AIO_MERGE_N_CONSECUTIVE	64
47 48 49 50 51 52 53

/* If this flag is TRUE, then we will use the native aio of the
OS (provided we compiled Innobase with it in), otherwise we will
use simulated aio we build below with threads */

ibool	os_aio_use_native_aio	= FALSE;

unknown's avatar
unknown committed
54 55
ibool	os_aio_print_debug	= FALSE;

56 57 58 59 60 61 62 63
/* The aio array slot structure */
typedef struct os_aio_slot_struct	os_aio_slot_t;

struct os_aio_slot_struct{
	ibool		is_read;	/* TRUE if a read operation */
	ulint		pos;		/* index of the slot in the aio
					array */
	ibool		reserved;	/* TRUE if this slot is reserved */
unknown's avatar
unknown committed
64
	time_t		reservation_time;/* time when reserved */
65 66 67 68 69 70 71 72
	ulint		len;		/* length of the block to read or
					write */
	byte*		buf;		/* buffer used in i/o */
	ulint		type;		/* OS_FILE_READ or OS_FILE_WRITE */
	ulint		offset;		/* 32 low bits of file offset in
					bytes */
	ulint		offset_high;	/* 32 high bits of file offset */
	os_file_t	file;		/* file where to read or write */
73
	const char*	name;		/* file name or path */
74 75 76 77 78 79 80 81 82 83 84
	ibool		io_already_done;/* used only in simulated aio:
					TRUE if the physical i/o already
					made and only the slot message
					needs to be passed to the caller
					of os_aio_simulated_handle */
	void*		message1;	/* message which is given by the */
	void*		message2;	/* the requester of an aio operation
					and which can be used to identify
					which pending aio operation was
					completed */
#ifdef WIN_ASYNC_IO
85 86
        os_event_t	event;		/* event object we need in the
					OVERLAPPED struct */
87 88 89 90 91 92 93 94 95 96 97 98 99
	OVERLAPPED	control;	/* Windows control block for the
					aio request */
#elif defined(POSIX_ASYNC_IO)
	struct aiocb	control;	/* Posix control block for aio
					request */
#endif
};

/* The aio array structure */
typedef struct os_aio_array_struct	os_aio_array_t;

struct os_aio_array_struct{
	os_mutex_t	mutex;	  /* the mutex protecting the aio array */
100
	os_event_t	not_full; /* The event which is set to the signaled
101 102
				  state when there is space in the aio
				  outside the ibuf segment */
103 104 105
	os_event_t	is_empty; /* The event which is set to the signaled
				  state when there are no pending i/os
				  in this array */
106 107 108 109 110 111 112 113
	ulint		n_slots;  /* Total number of slots in the aio array.
				  This must be divisible by n_threads. */
	ulint		n_segments;/* Number of segments in the aio array of
				  pending aio requests. A thread can wait
				  separately for any one of the segments. */
	ulint		n_reserved;/* Number of reserved slots in the
				  aio array outside the ibuf segment */
	os_aio_slot_t* 	slots;	  /* Pointer to the slots in the array */
114 115 116 117 118 119
#ifdef __WIN__
	os_native_event_t* native_events;	 
				  /* Pointer to an array of OS native event
				  handles where we copied the handles from
				  slots, in the same order. This can be used
				  in WaitForMultipleObjects; used only in
120
				  Windows */
121
#endif
122 123 124 125 126 127 128 129 130 131 132 133 134 135 136
};

/* Array of events used in simulated aio */
os_event_t*	os_aio_segment_wait_events	= NULL;

/* The aio arrays for non-ibuf i/o and ibuf i/o, as well as sync aio. These
are NULL when the module has not yet been initialized. */
os_aio_array_t*	os_aio_read_array	= NULL;
os_aio_array_t*	os_aio_write_array	= NULL;
os_aio_array_t*	os_aio_ibuf_array	= NULL;
os_aio_array_t*	os_aio_log_array	= NULL;
os_aio_array_t*	os_aio_sync_array	= NULL;

ulint	os_aio_n_segments	= ULINT_UNDEFINED;

unknown's avatar
unknown committed
137 138 139 140
/* If the following is TRUE, read i/o handler threads try to
wait until a batch of new read requests have been posted */
ibool	os_aio_recommend_sleep_for_read_threads	= FALSE;

141
ulint	os_n_file_reads		= 0;
unknown's avatar
unknown committed
142
ulint	os_bytes_read_since_printout = 0;
143 144 145 146 147 148 149
ulint	os_n_file_writes	= 0;
ulint	os_n_fsyncs		= 0;
ulint	os_n_file_reads_old	= 0;
ulint	os_n_file_writes_old	= 0;
ulint	os_n_fsyncs_old		= 0;
time_t	os_last_printout;

unknown's avatar
unknown committed
150 151
ibool	os_has_said_disk_full	= FALSE;

unknown's avatar
unknown committed
152 153 154 155 156 157
/* The mutex protecting the following counts of pending pread and pwrite
operations */
os_mutex_t os_file_count_mutex;
ulint	os_file_n_pending_preads  = 0;
ulint	os_file_n_pending_pwrites = 0;

158 159 160 161 162 163
/***************************************************************************
Gets the operating system version. Currently works only on Windows. */

ulint
os_get_os_version(void)
/*===================*/
unknown's avatar
unknown committed
164
                  /* out: OS_WIN95, OS_WIN31, OS_WINNT, OS_WIN2000 */
165 166
{
#ifdef __WIN__
167 168 169 170 171 172 173 174 175 176 177
  	OSVERSIONINFO     os_info;

  	os_info.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);

	ut_a(GetVersionEx(&os_info));

  	if (os_info.dwPlatformId == VER_PLATFORM_WIN32s) {
    		return(OS_WIN31);
  	} else if (os_info.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS) {
    		return(OS_WIN95);
  	} else if (os_info.dwPlatformId == VER_PLATFORM_WIN32_NT) {
unknown's avatar
unknown committed
178 179 180 181 182
		if (os_info.dwMajorVersion <= 4) {
    			return(OS_WINNT);
    		} else {
			return(OS_WIN2000);
    		}
183 184 185 186
  	} else {
    		ut_error;
    		return(0);
  	}
187
#else
188
  	ut_error;
189

190
  	return(0);
191 192 193
#endif
}

194 195 196 197 198 199 200
/***************************************************************************
Retrieves the last error number if an error occurs in a file io function.
The number should be retrieved before any other OS calls (because they may
overwrite the error number). If the number is not known to this program,
the OS error number + 100 is returned. */

ulint
unknown's avatar
unknown committed
201 202 203 204 205 206
os_file_get_last_error(
/*===================*/
					/* out: error number, or OS error
					number + 100 */
	ibool	report_all_errors)	/* in: TRUE if we want an error message
					printed of all errors */
207 208 209 210 211 212 213
{
	ulint	err;

#ifdef __WIN__

	err = (ulint) GetLastError();

unknown's avatar
unknown committed
214 215
	if (report_all_errors
	    || (err != ERROR_DISK_FULL && err != ERROR_FILE_EXISTS)) {
unknown's avatar
unknown committed
216

unknown's avatar
unknown committed
217 218
		ut_print_timestamp(stderr);
	     	fprintf(stderr,
219
  "  InnoDB: Operating system error number %lu in a file operation.\n", (ulong) err);
unknown's avatar
unknown committed
220

unknown's avatar
unknown committed
221
		if (err == ERROR_PATH_NOT_FOUND) {
unknown's avatar
unknown committed
222 223 224 225 226 227 228 229
			fprintf(stderr,
  "InnoDB: The error means the system cannot find the path specified.\n");

			if (srv_is_being_started) {
				fprintf(stderr,
  "InnoDB: If you are installing InnoDB, remember that you must create\n"
  "InnoDB: directories yourself, InnoDB does not create them.\n");
			}
unknown's avatar
unknown committed
230
		} else if (err == ERROR_ACCESS_DENIED) {
unknown's avatar
unknown committed
231
			fprintf(stderr,
unknown's avatar
unknown committed
232 233 234
  "InnoDB: The error means mysqld does not have the access rights to\n"
  "InnoDB: the directory. It may also be you have created a subdirectory\n"
  "InnoDB: of the same name as a data file.\n"); 
unknown's avatar
unknown committed
235
		} else {
unknown's avatar
unknown committed
236
			fprintf(stderr,
237 238 239
  "InnoDB: Some operating system error numbers are described at\n"
  "InnoDB: "
  "http://dev.mysql.com/doc/mysql/en/Operating_System_error_codes.html\n");
unknown's avatar
unknown committed
240
		}
241
	}
242

unknown's avatar
unknown committed
243 244
	fflush(stderr);

245 246 247 248 249 250 251 252 253 254
	if (err == ERROR_FILE_NOT_FOUND) {
		return(OS_FILE_NOT_FOUND);
	} else if (err == ERROR_DISK_FULL) {
		return(OS_FILE_DISK_FULL);
	} else if (err == ERROR_FILE_EXISTS) {
		return(OS_FILE_ALREADY_EXISTS);
	} else {
		return(100 + err);
	}
#else
255 256
	err = (ulint) errno;

unknown's avatar
unknown committed
257 258
	if (report_all_errors
	    || (err != ENOSPC && err != EEXIST)) {
unknown's avatar
unknown committed
259

unknown's avatar
unknown committed
260
		ut_print_timestamp(stderr);
unknown's avatar
unknown committed
261
	     	fprintf(stderr,
unknown's avatar
unknown committed
262
  "  InnoDB: Operating system error number %lu in a file operation.\n", (ulong) err);
unknown's avatar
unknown committed
263

unknown's avatar
unknown committed
264
		if (err == ENOENT) {
unknown's avatar
unknown committed
265 266 267 268 269 270 271 272
			fprintf(stderr,
  "InnoDB: The error means the system cannot find the path specified.\n");
			
			if (srv_is_being_started) {
				fprintf(stderr,
  "InnoDB: If you are installing InnoDB, remember that you must create\n"
  "InnoDB: directories yourself, InnoDB does not create them.\n");
			}
unknown's avatar
unknown committed
273
		} else if (err == EACCES) {
unknown's avatar
unknown committed
274
			fprintf(stderr,
unknown's avatar
unknown committed
275 276
  "InnoDB: The error means mysqld does not have the access rights to\n"
  "InnoDB: the directory.\n");
unknown's avatar
unknown committed
277
		} else {
unknown's avatar
unknown committed
278
			if (strerror((int)err) != NULL) {
unknown's avatar
unknown committed
279 280
				fprintf(stderr,
  "InnoDB: Error number %lu means '%s'.\n", err, strerror((int)err));
unknown's avatar
unknown committed
281
			}
unknown's avatar
unknown committed
282

unknown's avatar
unknown committed
283
			fprintf(stderr,
284 285 286
  "InnoDB: Some operating system error numbers are described at\n"
  "InnoDB: "
  "http://dev.mysql.com/doc/mysql/en/Operating_System_error_codes.html\n");
unknown's avatar
unknown committed
287
		}
288
	}
289

unknown's avatar
unknown committed
290 291
	fflush(stderr);

292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308
	if (err == ENOSPC ) {
		return(OS_FILE_DISK_FULL);
#ifdef POSIX_ASYNC_IO
	} else if (err == EAGAIN) {
		return(OS_FILE_AIO_RESOURCES_RESERVED);
#endif
	} else if (err == ENOENT) {
		return(OS_FILE_NOT_FOUND);
	} else if (err == EEXIST) {
		return(OS_FILE_ALREADY_EXISTS);
	} else {
		return(100 + err);
	}
#endif
}

/********************************************************************
unknown's avatar
unknown committed
309
Does error handling when a file operation fails. */
310 311 312 313
static
ibool
os_file_handle_error(
/*=================*/
unknown's avatar
unknown committed
314 315
				/* out: TRUE if we should retry the
				operation */
316
	const char*	name,	/* in: name of a file or NULL */
unknown's avatar
unknown committed
317
	const char*	operation)/* in: operation */
318 319 320
{
	ulint	err;

unknown's avatar
unknown committed
321
	err = os_file_get_last_error(FALSE);
322 323
	
	if (err == OS_FILE_DISK_FULL) {
unknown's avatar
unknown committed
324 325 326 327 328 329 330
		/* We only print a warning about disk full once */

		if (os_has_said_disk_full) {

			return(FALSE);
		}
	
331
		if (name) {
unknown's avatar
unknown committed
332 333 334
			ut_print_timestamp(stderr);
			fprintf(stderr,
	"  InnoDB: Encountered a problem with file %s\n", name);
335
		}
unknown's avatar
unknown committed
336 337

		ut_print_timestamp(stderr);
unknown's avatar
unknown committed
338
	        fprintf(stderr,
unknown's avatar
unknown committed
339
	"  InnoDB: Disk is full. Try to clean the disk to free space.\n");
340

unknown's avatar
unknown committed
341 342
		os_has_said_disk_full = TRUE;

unknown's avatar
unknown committed
343 344
		fflush(stderr);

unknown's avatar
unknown committed
345
		return(FALSE);
346

347
	} else if (err == OS_FILE_AIO_RESOURCES_RESERVED) {
unknown's avatar
unknown committed
348

349
		return(TRUE);
350 351

	} else if (err == OS_FILE_ALREADY_EXISTS) {
unknown's avatar
unknown committed
352

353
		return(FALSE);
354
	} else {
unknown's avatar
unknown committed
355 356 357
	        if (name) {
	                fprintf(stderr, "InnoDB: File name %s\n", name);
	        }
358
	  
359 360
		fprintf(stderr, "InnoDB: File operation call: '%s'.\n",
							       operation);
361 362
		fprintf(stderr, "InnoDB: Cannot continue operation.\n");

unknown's avatar
unknown committed
363 364
		fflush(stderr);

365
		exit(1);
366 367 368 369 370
	}

	return(FALSE);	
}

371 372
#undef USE_FILE_LOCK
#define USE_FILE_LOCK
373
#if defined(UNIV_HOTBACKUP) || defined(__WIN__) || defined(__FreeBSD__) || defined(__NETWARE__)
374 375 376 377 378 379 380
/* InnoDB Hot Backup does not lock the data files.
 * On Windows, mandatory locking is used.
 * On FreeBSD with LinuxThreads, advisory locking does not work properly.
 */
# undef USE_FILE_LOCK
#endif
#ifdef USE_FILE_LOCK
381 382 383 384 385 386 387 388
/********************************************************************
Obtain an exclusive lock on a file. */
static
int
os_file_lock(
/*=========*/
				/* out: 0 on success */
	int		fd,	/* in: file descriptor */
unknown's avatar
unknown committed
389
	const char*	name)	/* in: file name */
390 391
{
	struct flock lk;
unknown's avatar
unknown committed
392
	lk.l_type = F_WRLCK;
393 394 395 396
	lk.l_whence = SEEK_SET;
	lk.l_start = lk.l_len = 0;
	if (fcntl(fd, F_SETLK, &lk) == -1) {
		fprintf(stderr,
unknown's avatar
unknown committed
397 398 399 400 401 402 403 404
			"InnoDB: Unable to lock %s, error: %d\n", name, errno);

		if (errno == EAGAIN || errno == EACCES) {
			fprintf(stderr,
"InnoDB: Check that you do not already have another mysqld process\n"
"InnoDB: using the same InnoDB data or log files.\n");
		}

405 406
		return(-1);
	}
unknown's avatar
unknown committed
407

unknown's avatar
unknown committed
408
	return(0);
409
}
410
#endif /* USE_FILE_LOCK */
411

unknown's avatar
unknown committed
412 413 414 415 416 417 418 419
/********************************************************************
Does error handling when a file operation fails. */
static
ibool
os_file_handle_error_no_exit(
/*=========================*/
				/* out: TRUE if we should retry the
				operation */
420
	const char*	name,	/* in: name of a file or NULL */
unknown's avatar
unknown committed
421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467
	const char*	operation)/* in: operation */
{
	ulint	err;

	err = os_file_get_last_error(FALSE);
	
	if (err == OS_FILE_DISK_FULL) {
		/* We only print a warning about disk full once */

		if (os_has_said_disk_full) {

			return(FALSE);
		}
	
		if (name) {
			ut_print_timestamp(stderr);
			fprintf(stderr,
	"  InnoDB: Encountered a problem with file %s\n", name);
		}

		ut_print_timestamp(stderr);
	        fprintf(stderr,
	"  InnoDB: Disk is full. Try to clean the disk to free space.\n");

		os_has_said_disk_full = TRUE;

		fflush(stderr);

		return(FALSE);

	} else if (err == OS_FILE_AIO_RESOURCES_RESERVED) {

		return(TRUE);

	} else if (err == OS_FILE_ALREADY_EXISTS) {

		return(FALSE);
	} else {
	        if (name) {
	                fprintf(stderr, "InnoDB: File name %s\n", name);
	        }
	  
		fprintf(stderr, "InnoDB: File operation call: '%s'.\n",
							       operation);
		return (FALSE);
	}

468
	return(FALSE);		/* not reached */
unknown's avatar
unknown committed
469 470
}

unknown's avatar
unknown committed
471 472 473 474 475 476 477 478 479
/********************************************************************
Creates the seek mutexes used in positioned reads and writes. */

void
os_io_init_simple(void)
/*===================*/
{
	ulint	i;

unknown's avatar
unknown committed
480 481
	os_file_count_mutex = os_mutex_create(NULL);

unknown's avatar
unknown committed
482 483 484 485 486
	for (i = 0; i < OS_FILE_N_SEEK_MUTEXES; i++) {
		os_file_seek_mutexes[i] = os_mutex_create(NULL);
	}
}

487
#if !defined(UNIV_HOTBACKUP) && !defined(__NETWARE__)
488 489 490 491 492 493 494
/*************************************************************************
Creates a temporary file. This function is defined in ha_innodb.cc. */

int
innobase_mysql_tmpfile(void);
/*========================*/
			/* out: temporary file descriptor, or < 0 on error */
495
#endif /* !UNIV_HOTBACKUP && !__NETWARE__ */
496

497
/***************************************************************************
498
Creates a temporary file. */
499 500 501 502

FILE*
os_file_create_tmpfile(void)
/*========================*/
503
			/* out: temporary file handle, or NULL on error */
504
{
505 506 507
#ifdef __NETWARE__
	FILE*	file	= tmpfile();
#else /* __NETWARE__ */
508
	FILE*	file	= NULL;
509
	int	fd	= -1;
510
# ifdef UNIV_HOTBACKUP
511 512 513 514 515 516 517 518
	int	tries;
	for (tries = 10; tries--; ) {
		char*	name = tempnam(fil_path_to_mysql_datadir, "ib");
		if (!name) {
			break;
		}

		fd = open(name,
519
#  ifdef __WIN__
520
			O_SEQUENTIAL | O_SHORT_LIVED | O_TEMPORARY |
521
#  endif /* __WIN__ */
522 523 524
			O_CREAT | O_EXCL | O_RDWR,
			S_IREAD | S_IWRITE);
		if (fd >= 0) {
525
#  ifndef __WIN__
526
			unlink(name);
527
#  endif /* !__WIN__ */
528 529
			free(name);
			break;
530
		}
531

532
		ut_print_timestamp(stderr);
533 534 535 536 537
		fprintf(stderr, "  InnoDB: Warning: "
			"unable to create temporary file %s, retrying\n",
			name);
		free(name);
	}
538
# else /* UNIV_HOTBACKUP */
539
	fd = innobase_mysql_tmpfile();
540
# endif /* UNIV_HOTBACKUP */
541 542 543

	if (fd >= 0) {
		file = fdopen(fd, "w+b");
544
	}
545
#endif /* __NETWARE__ */
546 547

	if (!file) {
548
		ut_print_timestamp(stderr);
unknown's avatar
unknown committed
549 550 551
		fprintf(stderr,
			"  InnoDB: Error: unable to create temporary file;"
			" errno: %d\n", errno);
552
#ifndef __NETWARE__
553 554 555
		if (fd >= 0) {
			close(fd);
		}
556
#endif /* !__NETWARE__ */
557
	}
558

559 560 561
	return(file);
}

unknown's avatar
unknown committed
562 563 564 565 566 567 568 569 570
/***************************************************************************
The os_file_opendir() function opens a directory stream corresponding to the
directory named by the dirname argument. The directory stream is positioned
at the first entry. In both Unix and Windows we automatically skip the '.'
and '..' items at the start of the directory listing. */

os_file_dir_t
os_file_opendir(
/*============*/
571 572 573 574 575 576 577 578 579
					/* out: directory stream, NULL if
					error */
	const char*	dirname,	/* in: directory name; it must not
					contain a trailing '\' or '/' */
	ibool		error_is_fatal)	/* in: TRUE if we should treat an
					error as a fatal error; if we try to
					open symlinks then we do not wish a
					fatal error if it happens not to be
					a directory */
unknown's avatar
unknown committed
580 581 582 583 584 585 586 587 588
{
	os_file_dir_t		dir;
#ifdef __WIN__
        LPWIN32_FIND_DATA	lpFindFileData;
	char			path[OS_FILE_MAX_PATH + 3];

	ut_a(strlen(dirname) < OS_FILE_MAX_PATH);

	strcpy(path, dirname);
unknown's avatar
unknown committed
589
	strcpy(path + strlen(path), "\\*");
unknown's avatar
unknown committed
590 591 592 593 594 595 596 597 598 599 600 601 602 603

	/* Note that in Windows opening the 'directory stream' also retrieves
	the first entry in the directory. Since it is '.', that is no problem,
	as we will skip over the '.' and '..' entries anyway. */

	lpFindFileData = ut_malloc(sizeof(WIN32_FIND_DATA));

	dir = FindFirstFile(path, lpFindFileData);

	ut_free(lpFindFileData);

	if (dir == INVALID_HANDLE_VALUE) {

		if (error_is_fatal) {
unknown's avatar
unknown committed
604
		        os_file_handle_error(dirname, "opendir");
unknown's avatar
unknown committed
605 606 607 608 609 610 611 612 613 614
		}

		return(NULL);
	}

	return(dir);	
#else
	dir = opendir(dirname);

	if (dir == NULL && error_is_fatal) {
unknown's avatar
unknown committed
615
	        os_file_handle_error(dirname, "opendir");
unknown's avatar
unknown committed
616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636
	}

	return(dir);
#endif
}

/***************************************************************************
Closes a directory stream. */

int
os_file_closedir(
/*=============*/
				/* out: 0 if success, -1 if failure */
	os_file_dir_t	dir)	/* in: directory stream */
{
#ifdef __WIN__
	BOOL		ret;

	ret = FindClose(dir);

	if (!ret) {
unknown's avatar
unknown committed
637
	        os_file_handle_error_no_exit(NULL, "closedir");
unknown's avatar
unknown committed
638 639 640 641 642 643 644 645 646 647 648
		
		return(-1);
	}
	
	return(0);
#else
	int	ret;
	
	ret = closedir(dir);

	if (ret) {
unknown's avatar
unknown committed
649
	        os_file_handle_error_no_exit(NULL, "closedir");
unknown's avatar
unknown committed
650 651 652 653 654 655 656 657 658 659 660 661 662 663 664
	}

	return(ret);
#endif
}

/***************************************************************************
This function returns information of the next file in the directory. We jump
over the '.' and '..' entries in the directory. */

int
os_file_readdir_next_file(
/*======================*/
				/* out: 0 if ok, -1 if error, 1 if at the end
				of the directory */
665
	const char*	dirname,/* in: directory name or path */
unknown's avatar
unknown committed
666 667 668 669 670 671 672 673 674 675 676 677
	os_file_dir_t	dir,	/* in: directory stream */
	os_file_stat_t*	info)	/* in/out: buffer where the info is returned */
{
#ifdef __WIN__
	LPWIN32_FIND_DATA	lpFindFileData;
	BOOL			ret;

	lpFindFileData = ut_malloc(sizeof(WIN32_FIND_DATA));
next_file:
	ret = FindNextFile(dir, lpFindFileData);

	if (ret) {
unknown's avatar
unknown committed
678
	        ut_a(strlen(lpFindFileData->cFileName) < OS_FILE_MAX_PATH);
unknown's avatar
unknown committed
679

unknown's avatar
unknown committed
680 681
		if (strcmp(lpFindFileData->cFileName, ".") == 0
		    || strcmp(lpFindFileData->cFileName, "..") == 0) {
unknown's avatar
unknown committed
682 683 684 685

		        goto next_file;
		}

unknown's avatar
unknown committed
686
		strcpy(info->name, lpFindFileData->cFileName);
unknown's avatar
unknown committed
687

unknown's avatar
unknown committed
688 689
		info->size = (ib_longlong)(lpFindFileData->nFileSizeLow)
		     + (((ib_longlong)(lpFindFileData->nFileSizeHigh)) << 32);
unknown's avatar
unknown committed
690 691 692 693 694 695 696 697 698 699 700 701

		if (lpFindFileData->dwFileAttributes
					& FILE_ATTRIBUTE_REPARSE_POINT) {
/* TODO: test Windows symlinks */
/* TODO: MySQL has apparently its own symlink implementation in Windows,
dbname.sym can redirect a database directory:
http://www.mysql.com/doc/en/Windows_symbolic_links.html */
			info->type = OS_FILE_TYPE_LINK;
		} else if (lpFindFileData->dwFileAttributes
						& FILE_ATTRIBUTE_DIRECTORY) {
		        info->type = OS_FILE_TYPE_DIR;
		} else {
unknown's avatar
unknown committed
702 703 704 705 706
			/* It is probably safest to assume that all other
			file types are normal. Better to check them rather
			than blindly skip them. */

			info->type = OS_FILE_TYPE_FILE;
unknown's avatar
unknown committed
707 708 709 710 711 712 713 714 715 716 717
		}
	}

	ut_free(lpFindFileData);

	if (ret) {
		return(0);
	} else if (GetLastError() == ERROR_NO_MORE_FILES) {

		return(1);
	} else {
unknown's avatar
unknown committed
718
		os_file_handle_error_no_exit(dirname,
unknown's avatar
unknown committed
719
						"readdir_next_file");
unknown's avatar
unknown committed
720 721 722 723 724 725 726
		return(-1);
	}
#else
	struct dirent*	ent;
	char*		full_path;
	int		ret;
	struct stat	statinfo;
unknown's avatar
unknown committed
727 728 729 730 731 732 733 734
#ifdef HAVE_READDIR_R
	char		dirent_buf[sizeof(struct dirent) + _POSIX_PATH_MAX +
								100];
			/* In /mysys/my_lib.c, _POSIX_PATH_MAX + 1 is used as
			the max file name len; but in most standards, the
			length is NAME_MAX; we add 100 to be even safer */
#endif

unknown's avatar
unknown committed
735
next_file:
unknown's avatar
unknown committed
736 737 738 739 740 741 742 743 744 745

#ifdef HAVE_READDIR_R
	ret = readdir_r(dir, (struct dirent*)dirent_buf, &ent);

	if (ret != 0) {
		fprintf(stderr,
"InnoDB: cannot read directory %s, error %lu\n", dirname, (ulong)ret);

		return(-1);
	}
unknown's avatar
unknown committed
746 747

	if (ent == NULL) {
unknown's avatar
unknown committed
748 749
		/* End of directory */
		
unknown's avatar
unknown committed
750 751 752
		return(1);
	}

unknown's avatar
unknown committed
753 754 755 756 757 758 759 760 761
	ut_a(strlen(ent->d_name) < _POSIX_PATH_MAX + 100 - 1);
#else
	ent = readdir(dir);

	if (ent == NULL) {

		return(1);
	}
#endif
unknown's avatar
unknown committed
762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777
	ut_a(strlen(ent->d_name) < OS_FILE_MAX_PATH);

	if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0) {

		goto next_file;
	}

	strcpy(info->name, ent->d_name);

	full_path = ut_malloc(strlen(dirname) + strlen(ent->d_name) + 10);
	
	sprintf(full_path, "%s/%s", dirname, ent->d_name);

	ret = stat(full_path, &statinfo);

	if (ret) {
unknown's avatar
unknown committed
778
		os_file_handle_error_no_exit(full_path, "stat");
unknown's avatar
unknown committed
779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802

		ut_free(full_path);

		return(-1);
	}

	info->size = (ib_longlong)statinfo.st_size;

	if (S_ISDIR(statinfo.st_mode)) {
		info->type = OS_FILE_TYPE_DIR;
	} else if (S_ISLNK(statinfo.st_mode)) {
	        info->type = OS_FILE_TYPE_LINK;
	} else if (S_ISREG(statinfo.st_mode)) {
	        info->type = OS_FILE_TYPE_FILE;
	} else {
	        info->type = OS_FILE_TYPE_UNKNOWN;
	}
			
	ut_free(full_path);

	return(0);
#endif
}

unknown's avatar
unknown committed
803 804 805 806 807 808 809 810 811
/*********************************************************************
This function attempts to create a directory named pathname. The new directory
gets default permissions. On Unix the permissions are (0770 & ~umask). If the
directory exists already, nothing is done and the call succeeds, unless the
fail_if_exists arguments is true. */

ibool
os_file_create_directory(
/*=====================*/
812 813 814 815 816 817
					/* out: TRUE if call succeeds,
					FALSE on error */
	const char*	pathname,	/* in: directory name as
					null-terminated string */
	ibool		fail_if_exists)	/* in: if TRUE, pre-existing directory
					is treated as an error. */
unknown's avatar
unknown committed
818 819 820 821 822 823
{
#ifdef __WIN__
	BOOL	rcode;
    
	rcode = CreateDirectory(pathname, NULL);
	if (!(rcode != 0 ||
unknown's avatar
unknown committed
824
	   (GetLastError() == ERROR_ALREADY_EXISTS && !fail_if_exists))) {
unknown's avatar
unknown committed
825
		/* failure */
826
		os_file_handle_error(pathname, "CreateDirectory");
unknown's avatar
unknown committed
827 828 829 830 831 832 833 834 835 836 837 838

		return(FALSE);
	}
        
	return (TRUE);
#else
	int	rcode;

	rcode = mkdir(pathname, 0770);

	if (!(rcode == 0 || (errno == EEXIST && !fail_if_exists))) {
		/* failure */
unknown's avatar
unknown committed
839
		os_file_handle_error(pathname, "mkdir");
unknown's avatar
unknown committed
840 841 842 843 844 845 846 847

		return(FALSE);
	}
        
	return (TRUE);
#endif    
}

unknown's avatar
unknown committed
848 849 850 851 852 853
/********************************************************************
A simple function to open or create a file. */

os_file_t
os_file_create_simple(
/*==================*/
854 855 856 857 858 859 860 861 862 863 864 865 866 867 868
				/* out, own: handle to the file, not defined
				if error, error number can be retrieved with
				os_file_get_last_error */
	const char*	name,	/* in: name of the file or path as a
				null-terminated string */
	ulint		create_mode,/* in: OS_FILE_OPEN if an existing file is
				opened (if does not exist, error), or
				OS_FILE_CREATE if a new file is created
				(if exists, error), or
	                        OS_FILE_CREATE_PATH if new file
				(if exists, error) and subdirectories along
				its path are created (if needed)*/
	ulint		access_type,/* in: OS_FILE_READ_ONLY or
				OS_FILE_READ_WRITE */
	ibool*		success)/* out: TRUE if succeed, FALSE if error */
unknown's avatar
unknown committed
869 870 871 872 873 874 875 876 877 878 879 880 881 882 883
{
#ifdef __WIN__
	os_file_t	file;
	DWORD		create_flag;
	DWORD		access;
	DWORD		attributes	= 0;
	ibool		retry;
	
try_again:	
	ut_a(name);

	if (create_mode == OS_FILE_OPEN) {
		create_flag = OPEN_EXISTING;
	} else if (create_mode == OS_FILE_CREATE) {
		create_flag = CREATE_NEW;
unknown's avatar
unknown committed
884 885 886 887 888 889 890 891
        } else if (create_mode == OS_FILE_CREATE_PATH) {
                /* create subdirs along the path if needed  */
                *success = os_file_create_subdirs_if_needed(name);
                if (!*success) {
                        ut_error;
                }
                create_flag = CREATE_NEW;
                create_mode = OS_FILE_CREATE;
unknown's avatar
unknown committed
892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907
	} else {
		create_flag = 0;
		ut_error;
	}

	if (access_type == OS_FILE_READ_ONLY) {
		access = GENERIC_READ;
	} else if (access_type == OS_FILE_READ_WRITE) {
		access = GENERIC_READ | GENERIC_WRITE;
	} else {
		access = 0;
		ut_error;
	}

	file = CreateFile(name,
			access,
unknown's avatar
unknown committed
908 909 910
			FILE_SHARE_READ | FILE_SHARE_WRITE,
					/* file can be read ansd written also
					by other processes */
unknown's avatar
unknown committed
911 912 913 914 915 916 917 918
			NULL,	/* default security attributes */
			create_flag,
			attributes,
			NULL);	/* no template file */

	if (file == INVALID_HANDLE_VALUE) {
		*success = FALSE;

919
		retry = os_file_handle_error(name,
unknown's avatar
unknown committed
920 921
				create_mode == OS_FILE_OPEN ?
				"open" : "create");
unknown's avatar
unknown committed
922 923 924 925 926 927 928 929
		if (retry) {
			goto try_again;
		}
	} else {
		*success = TRUE;
	}

	return(file);
930
#else /* __WIN__ */
unknown's avatar
unknown committed
931 932 933 934 935 936 937 938 939 940 941 942 943 944 945
	os_file_t	file;
	int		create_flag;
	ibool		retry;
	
try_again:	
	ut_a(name);

	if (create_mode == OS_FILE_OPEN) {
		if (access_type == OS_FILE_READ_ONLY) {
			create_flag = O_RDONLY;
		} else {
			create_flag = O_RDWR;
		}
	} else if (create_mode == OS_FILE_CREATE) {
		create_flag = O_RDWR | O_CREAT | O_EXCL;
unknown's avatar
unknown committed
946 947 948 949 950 951 952 953
        } else if (create_mode == OS_FILE_CREATE_PATH) {
                /* create subdirs along the path if needed  */
                *success = os_file_create_subdirs_if_needed(name);
                if (!*success) {
                        return (-1);
                }
                create_flag = O_RDWR | O_CREAT | O_EXCL;
                create_mode = OS_FILE_CREATE;
unknown's avatar
unknown committed
954 955 956 957 958 959
	} else {
		create_flag = 0;
		ut_error;
	}

	if (create_mode == OS_FILE_CREATE) {
unknown's avatar
unknown committed
960 961
	        file = open(name, create_flag, S_IRUSR | S_IWUSR
						| S_IRGRP | S_IWGRP);
unknown's avatar
unknown committed
962 963 964 965 966 967 968
        } else {
                file = open(name, create_flag);
        }
	
	if (file == -1) {
		*success = FALSE;

969
		retry = os_file_handle_error(name,
unknown's avatar
unknown committed
970 971
				create_mode == OS_FILE_OPEN ?
				"open" : "create");
unknown's avatar
unknown committed
972 973 974
		if (retry) {
			goto try_again;
		}
975
#ifdef USE_FILE_LOCK
unknown's avatar
unknown committed
976 977
	} else if (access_type == OS_FILE_READ_WRITE
			&& os_file_lock(file, name)) {
978
		*success = FALSE;
979
		close(file);
980 981
		file = -1;
#endif
unknown's avatar
unknown committed
982 983 984 985 986
	} else {
		*success = TRUE;
	}

	return(file);	
987
#endif /* __WIN__ */
unknown's avatar
unknown committed
988
}
unknown's avatar
unknown committed
989 990 991 992 993 994 995

/********************************************************************
A simple function to open or create a file. */

os_file_t
os_file_create_simple_no_error_handling(
/*====================================*/
996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009
				/* out, own: handle to the file, not defined
				if error, error number can be retrieved with
				os_file_get_last_error */
	const char*	name,	/* in: name of the file or path as a
				null-terminated string */
	ulint		create_mode,/* in: OS_FILE_OPEN if an existing file
				is opened (if does not exist, error), or
				OS_FILE_CREATE if a new file is created
				(if exists, error) */
	ulint		access_type,/* in: OS_FILE_READ_ONLY,
				OS_FILE_READ_WRITE, or
				OS_FILE_READ_ALLOW_DELETE; the last option is
				used by a backup program reading the file */
	ibool*		success)/* out: TRUE if succeed, FALSE if error */
unknown's avatar
unknown committed
1010 1011 1012 1013 1014 1015
{
#ifdef __WIN__
	os_file_t	file;
	DWORD		create_flag;
	DWORD		access;
	DWORD		attributes	= 0;
unknown's avatar
unknown committed
1016
	DWORD		share_mode	= FILE_SHARE_READ | FILE_SHARE_WRITE;
unknown's avatar
unknown committed
1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032
	
	ut_a(name);

	if (create_mode == OS_FILE_OPEN) {
		create_flag = OPEN_EXISTING;
	} else if (create_mode == OS_FILE_CREATE) {
		create_flag = CREATE_NEW;
	} else {
		create_flag = 0;
		ut_error;
	}

	if (access_type == OS_FILE_READ_ONLY) {
		access = GENERIC_READ;
	} else if (access_type == OS_FILE_READ_WRITE) {
		access = GENERIC_READ | GENERIC_WRITE;
unknown's avatar
unknown committed
1033 1034 1035 1036 1037 1038 1039
	} else if (access_type == OS_FILE_READ_ALLOW_DELETE) {
		access = GENERIC_READ;
		share_mode = FILE_SHARE_DELETE | FILE_SHARE_READ
			   | FILE_SHARE_WRITE;  /* A backup program has to give
						mysqld the maximum freedom to
						do what it likes with the
						file */
unknown's avatar
unknown committed
1040 1041 1042 1043 1044 1045 1046
	} else {
		access = 0;
		ut_error;
	}

	file = CreateFile(name,
			access,
unknown's avatar
unknown committed
1047
			share_mode,
unknown's avatar
unknown committed
1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059
			NULL,	/* default security attributes */
			create_flag,
			attributes,
			NULL);	/* no template file */

	if (file == INVALID_HANDLE_VALUE) {
		*success = FALSE;
	} else {
		*success = TRUE;
	}

	return(file);
1060
#else /* __WIN__ */
unknown's avatar
unknown committed
1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087
	os_file_t	file;
	int		create_flag;
	
	ut_a(name);

	if (create_mode == OS_FILE_OPEN) {
		if (access_type == OS_FILE_READ_ONLY) {
			create_flag = O_RDONLY;
		} else {
			create_flag = O_RDWR;
		}
	} else if (create_mode == OS_FILE_CREATE) {
		create_flag = O_RDWR | O_CREAT | O_EXCL;
	} else {
		create_flag = 0;
		ut_error;
	}

	if (create_mode == OS_FILE_CREATE) {
	        file = open(name, create_flag, S_IRUSR | S_IWUSR
						| S_IRGRP | S_IWGRP);
        } else {
                file = open(name, create_flag);
        }
	
	if (file == -1) {
		*success = FALSE;
1088
#ifdef USE_FILE_LOCK
unknown's avatar
unknown committed
1089 1090
	} else if (access_type == OS_FILE_READ_WRITE
			&& os_file_lock(file, name)) {
1091
		*success = FALSE;
1092
		close(file);
1093 1094
		file = -1;
#endif
unknown's avatar
unknown committed
1095 1096 1097 1098 1099
	} else {
		*success = TRUE;
	}

	return(file);	
1100
#endif /* __WIN__ */
unknown's avatar
unknown committed
1101 1102
}

1103 1104 1105 1106 1107 1108
/********************************************************************
Opens an existing file or creates a new. */

os_file_t
os_file_create(
/*===========*/
1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130
				/* out, own: handle to the file, not defined
				if error, error number can be retrieved with
				os_file_get_last_error */
	const char*	name,	/* in: name of the file or path as a
				null-terminated string */
	ulint		create_mode,/* in: OS_FILE_OPEN if an existing file
				is opened (if does not exist, error), or
				OS_FILE_CREATE if a new file is created
				(if exists, error),
				OS_FILE_OVERWRITE if a new file is created
				or an old overwritten;
				OS_FILE_OPEN_RAW, if a raw device or disk
				partition should be opened */
	ulint		purpose,/* in: OS_FILE_AIO, if asynchronous,
				non-buffered i/o is desired,
				OS_FILE_NORMAL, if any normal file;
				NOTE that it also depends on type, os_aio_..
				and srv_.. variables whether we really use
				async i/o or unbuffered i/o: look in the
				function source code for the exact rules */
	ulint		type,	/* in: OS_DATA_FILE or OS_LOG_FILE */
	ibool*		success)/* out: TRUE if succeed, FALSE if error */
1131 1132 1133
{
#ifdef __WIN__
	os_file_t	file;
unknown's avatar
unknown committed
1134
	DWORD		share_mode	= FILE_SHARE_READ;
1135 1136 1137 1138 1139 1140
	DWORD		create_flag;
	DWORD		attributes;
	ibool		retry;
try_again:	
	ut_a(name);

unknown's avatar
unknown committed
1141 1142 1143
	if (create_mode == OS_FILE_OPEN_RAW) {
		create_flag = OPEN_EXISTING;
		share_mode = FILE_SHARE_WRITE;
1144 1145
	} else if (create_mode == OS_FILE_OPEN
			|| create_mode == OS_FILE_OPEN_RETRY) {
1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156
		create_flag = OPEN_EXISTING;
	} else if (create_mode == OS_FILE_CREATE) {
		create_flag = CREATE_NEW;
	} else if (create_mode == OS_FILE_OVERWRITE) {
		create_flag = CREATE_ALWAYS;
	} else {
		create_flag = 0;
		ut_error;
	}

	if (purpose == OS_FILE_AIO) {
1157 1158
		/* If specified, use asynchronous (overlapped) io and no
		buffering of writes in the OS */
1159 1160 1161 1162 1163 1164 1165
		attributes = 0;
#ifdef WIN_ASYNC_IO
		if (os_aio_use_native_aio) {
			attributes = attributes | FILE_FLAG_OVERLAPPED;
		}
#endif			
#ifdef UNIV_NON_BUFFERED_IO
1166
		if (type == OS_LOG_FILE && srv_flush_log_at_trx_commit == 2) {
unknown's avatar
unknown committed
1167
		        /* Do not use unbuffered i/o to log files because
1168 1169 1170 1171 1172
		        value 2 denotes that we do not flush the log at every
		        commit, but only once per second */
		} else if (srv_win_file_flush_method ==
						      SRV_WIN_IO_UNBUFFERED) {
		        attributes = attributes | FILE_FLAG_NO_BUFFERING;
unknown's avatar
unknown committed
1173
		}
1174 1175
#endif
	} else if (purpose == OS_FILE_NORMAL) {
unknown's avatar
unknown committed
1176
	        attributes = 0;
1177
#ifdef UNIV_NON_BUFFERED_IO
unknown's avatar
unknown committed
1178 1179 1180 1181
		if (type == OS_LOG_FILE && srv_flush_log_at_trx_commit == 2) {
		        /* Do not use unbuffered i/o to log files because
		        value 2 denotes that we do not flush the log at every
		        commit, but only once per second */
1182 1183 1184
		} else if (srv_win_file_flush_method ==
						      SRV_WIN_IO_UNBUFFERED) {
		        attributes = attributes | FILE_FLAG_NO_BUFFERING;
unknown's avatar
unknown committed
1185
		}
1186 1187 1188 1189 1190 1191 1192 1193 1194
#endif
	} else {
		attributes = 0;
		ut_error;
	}

	file = CreateFile(name,
			GENERIC_READ | GENERIC_WRITE, /* read and write
							access */
unknown's avatar
unknown committed
1195
			share_mode,     /* File can be read also by other
unknown's avatar
unknown committed
1196 1197 1198 1199 1200 1201
					processes; we must give the read
					permission because of ibbackup. We do
					not give the write permission to
					others because if one would succeed to
					start 2 instances of mysqld on the
					SAME files, that could cause severe
unknown's avatar
unknown committed
1202
					database corruption! When opening
unknown's avatar
unknown committed
1203
					raw disk partitions, Microsoft manuals
unknown's avatar
unknown committed
1204 1205
					say that we must give also the write
					permission. */
1206 1207 1208 1209 1210 1211 1212 1213
			NULL,	/* default security attributes */
			create_flag,
			attributes,
			NULL);	/* no template file */

	if (file == INVALID_HANDLE_VALUE) {
		*success = FALSE;

1214
		retry = os_file_handle_error(name,
unknown's avatar
unknown committed
1215 1216
				create_mode == OS_FILE_CREATE ?
				"create" : "open");
1217 1218
		if (retry) {
			goto try_again;
1219 1220 1221 1222 1223 1224
		}
	} else {
		*success = TRUE;
	}

	return(file);
1225
#else /* __WIN__ */
1226 1227 1228
	os_file_t	file;
	int		create_flag;
	ibool		retry;
1229 1230 1231
	const char*	mode_str	= NULL;
	const char*	type_str	= NULL;
	const char*	purpose_str	= NULL;
1232 1233 1234 1235
	
try_again:	
	ut_a(name);

1236 1237
	if (create_mode == OS_FILE_OPEN || create_mode == OS_FILE_OPEN_RAW
			|| create_mode == OS_FILE_OPEN_RETRY) {
1238
		mode_str = "OPEN";
1239 1240
		create_flag = O_RDWR;
	} else if (create_mode == OS_FILE_CREATE) {
1241
		mode_str = "CREATE";
1242 1243
		create_flag = O_RDWR | O_CREAT | O_EXCL;
	} else if (create_mode == OS_FILE_OVERWRITE) {
1244
		mode_str = "OVERWRITE";
1245 1246 1247 1248 1249 1250
		create_flag = O_RDWR | O_CREAT | O_TRUNC;
	} else {
		create_flag = 0;
		ut_error;
	}

1251 1252 1253 1254 1255
	if (type == OS_LOG_FILE) {
		type_str = "LOG";
	} else if (type == OS_DATA_FILE) {
		type_str = "DATA";
	} else {
1256
	        ut_error;
1257 1258 1259 1260 1261 1262 1263
	}
	  
	if (purpose == OS_FILE_AIO) {
		purpose_str = "AIO";
	} else if (purpose == OS_FILE_NORMAL) {
		purpose_str = "NORMAL";
	} else {
1264
	        ut_error;
1265
	}
1266

1267
/*	fprintf(stderr, "Opening file %s, mode %s, type %s, purpose %s\n",
1268
			       name, mode_str, type_str, purpose_str); */
1269
#ifdef O_SYNC
1270 1271 1272 1273
        /* We let O_SYNC only affect log files; note that we map O_DSYNC to
	O_SYNC because the datasync options seemed to corrupt files in 2001
	in both Linux and Solaris */
	if (type == OS_LOG_FILE
1274 1275
	    && srv_unix_file_flush_method == SRV_UNIX_O_DSYNC) {

1276
/*		fprintf(stderr, "Using O_SYNC for file %s\n", name); */
1277

1278
	        create_flag = create_flag | O_SYNC;
1279
	}
1280 1281 1282 1283 1284 1285
#endif
#ifdef O_DIRECT
        /* We let O_DIRECT only affect data files */
	if (type != OS_LOG_FILE
	    && srv_unix_file_flush_method == SRV_UNIX_O_DIRECT) {

1286
/*		fprintf(stderr, "Using O_DIRECT for file %s\n", name); */
1287 1288 1289

	        create_flag = create_flag | O_DIRECT;
	}
1290
#endif
1291
	if (create_mode == OS_FILE_CREATE) {
unknown's avatar
unknown committed
1292
	        file = open(name, create_flag, os_innodb_umask);
1293 1294 1295 1296 1297 1298 1299
        } else {
                file = open(name, create_flag);
        }
	
	if (file == -1) {
		*success = FALSE;

1300
		retry = os_file_handle_error(name,
unknown's avatar
unknown committed
1301 1302
				create_mode == OS_FILE_CREATE ?
				"create" : "open");
1303 1304
		if (retry) {
			goto try_again;
1305
		}
1306
#ifdef USE_FILE_LOCK
unknown's avatar
unknown committed
1307 1308
	} else if (create_mode != OS_FILE_OPEN_RAW
			&& os_file_lock(file, name)) {
1309
		*success = FALSE;
1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326
		if (create_mode == OS_FILE_OPEN_RETRY) {
			int i;
			ut_print_timestamp(stderr);
			fputs("  InnoDB: Retrying to lock the first data file\n",
				stderr);
			for (i = 0; i < 100; i++) {
				os_thread_sleep(1000000);
				if (!os_file_lock(file, name)) {
					*success = TRUE;
					return(file);
				}
			}
			ut_print_timestamp(stderr);
			fputs("  InnoDB: Unable to open the first data file\n",
				stderr);
		}
		close(file);
1327 1328
		file = -1;
#endif
1329 1330 1331 1332 1333
	} else {
		*success = TRUE;
	}

	return(file);	
1334
#endif /* __WIN__ */
1335 1336
}

unknown's avatar
unknown committed
1337 1338 1339 1340 1341 1342
/***************************************************************************
Deletes a file if it exists. The file has to be closed before calling this. */

ibool
os_file_delete_if_exists(
/*=====================*/
1343 1344
				/* out: TRUE if success */
	const char*	name)	/* in: file path as a null-terminated string */
unknown's avatar
unknown committed
1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358
{
#ifdef __WIN__
	BOOL	ret;
	ulint	count	= 0;
loop:
	/* In Windows, deleting an .ibd file may fail if ibbackup is copying
	it */

	ret = DeleteFile((LPCTSTR)name);

	if (ret) {
		return(TRUE);
	}

unknown's avatar
unknown committed
1359
	if (GetLastError() == ERROR_FILE_NOT_FOUND) {
unknown's avatar
unknown committed
1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388
		/* the file does not exist, this not an error */

		return(TRUE);
	}

	count++;

	if (count > 100 && 0 == (count % 10)) {
		fprintf(stderr,
"InnoDB: Warning: cannot delete file %s\n"
"InnoDB: Are you running ibbackup to back up the file?\n", name);
		
		os_file_get_last_error(TRUE); /* print error information */
	}

	os_thread_sleep(1000000);	/* sleep for a second */

	if (count > 2000) {

		return(FALSE);
	}

	goto loop;
#else
	int	ret;

	ret = unlink((const char*)name);

	if (ret != 0 && errno != ENOENT) {
unknown's avatar
unknown committed
1389
		os_file_handle_error_no_exit(name, "delete");
unknown's avatar
unknown committed
1390 1391 1392 1393 1394 1395 1396 1397

		return(FALSE);
	}

	return(TRUE);
#endif
}

unknown's avatar
unknown committed
1398 1399 1400 1401 1402 1403
/***************************************************************************
Deletes a file. The file has to be closed before calling this. */

ibool
os_file_delete(
/*===========*/
1404 1405
				/* out: TRUE if success */
	const char*	name)	/* in: file path as a null-terminated string */
unknown's avatar
unknown committed
1406 1407
{
#ifdef __WIN__
unknown's avatar
unknown committed
1408
	BOOL	ret;
unknown's avatar
unknown committed
1409 1410 1411 1412
	ulint	count	= 0;
loop:
	/* In Windows, deleting an .ibd file may fail if ibbackup is copying
	it */
unknown's avatar
unknown committed
1413 1414 1415 1416 1417 1418 1419

	ret = DeleteFile((LPCTSTR)name);

	if (ret) {
		return(TRUE);
	}

unknown's avatar
unknown committed
1420
	if (GetLastError() == ERROR_FILE_NOT_FOUND) {
unknown's avatar
unknown committed
1421 1422
		/* If the file does not exist, we classify this as a 'mild'
		error and return */
unknown's avatar
unknown committed
1423

unknown's avatar
unknown committed
1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444
		return(FALSE);
	}

	count++;

	if (count > 100 && 0 == (count % 10)) {
		fprintf(stderr,
"InnoDB: Warning: cannot delete file %s\n"
"InnoDB: Are you running ibbackup to back up the file?\n", name);
		
		os_file_get_last_error(TRUE); /* print error information */
	}

	os_thread_sleep(1000000);	/* sleep for a second */

	if (count > 2000) {

		return(FALSE);
	}

	goto loop;
unknown's avatar
unknown committed
1445
#else
unknown's avatar
unknown committed
1446
	int	ret;
unknown's avatar
unknown committed
1447 1448 1449 1450

	ret = unlink((const char*)name);

	if (ret != 0) {
unknown's avatar
unknown committed
1451
		os_file_handle_error_no_exit(name, "delete");
unknown's avatar
unknown committed
1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467

		return(FALSE);
	}

	return(TRUE);
#endif
}

/***************************************************************************
Renames a file (can also move it to another directory). It is safest that the
file is closed before calling this function. */

ibool
os_file_rename(
/*===========*/
				/* out: TRUE if success */
1468
	const char*	oldpath,/* in: old file path as a null-terminated
unknown's avatar
unknown committed
1469
				string */
1470
	const char*	newpath)/* in: new file path */
unknown's avatar
unknown committed
1471 1472
{
#ifdef __WIN__
unknown's avatar
unknown committed
1473
	BOOL	ret;
unknown's avatar
unknown committed
1474 1475 1476 1477 1478 1479 1480

	ret = MoveFile((LPCTSTR)oldpath, (LPCTSTR)newpath);

	if (ret) {
		return(TRUE);
	}

unknown's avatar
unknown committed
1481
	os_file_handle_error(oldpath, "rename");
unknown's avatar
unknown committed
1482 1483 1484

	return(FALSE);
#else
unknown's avatar
unknown committed
1485
	int	ret;
unknown's avatar
unknown committed
1486 1487 1488 1489

	ret = rename((const char*)oldpath, (const char*)newpath);

	if (ret != 0) {
unknown's avatar
unknown committed
1490
		os_file_handle_error(oldpath, "rename");
unknown's avatar
unknown committed
1491 1492 1493 1494 1495 1496 1497 1498

		return(FALSE);
	}

	return(TRUE);
#endif
}

1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519
/***************************************************************************
Closes a file handle. In case of error, error number can be retrieved with
os_file_get_last_error. */

ibool
os_file_close(
/*==========*/
				/* out: TRUE if success */
	os_file_t	file)	/* in, own: handle to a file */
{
#ifdef __WIN__
	BOOL	ret;

	ut_a(file);

	ret = CloseHandle(file);

	if (ret) {
		return(TRUE);
	}

1520
	os_file_handle_error(NULL, "close");
unknown's avatar
unknown committed
1521

1522 1523 1524 1525 1526 1527 1528
	return(FALSE);
#else
	int	ret;

	ret = close(file);

	if (ret == -1) {
1529
		os_file_handle_error(NULL, "close");
unknown's avatar
unknown committed
1530

1531 1532 1533 1534 1535 1536 1537
		return(FALSE);
	}

	return(TRUE);
#endif
}

unknown's avatar
unknown committed
1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572
/***************************************************************************
Closes a file handle. */

ibool
os_file_close_no_error_handling(
/*============================*/
				/* out: TRUE if success */
	os_file_t	file)	/* in, own: handle to a file */
{
#ifdef __WIN__
	BOOL	ret;

	ut_a(file);

	ret = CloseHandle(file);

	if (ret) {
		return(TRUE);
	}

	return(FALSE);
#else
	int	ret;

	ret = close(file);

	if (ret == -1) {

		return(FALSE);
	}

	return(TRUE);
#endif
}

1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599
/***************************************************************************
Gets a file size. */

ibool
os_file_get_size(
/*=============*/
				/* out: TRUE if success */
	os_file_t	file,	/* in: handle to a file */
	ulint*		size,	/* out: least significant 32 bits of file
				size */
	ulint*		size_high)/* out: most significant 32 bits of size */
{
#ifdef __WIN__
	DWORD	high;
	DWORD	low;

	low = GetFileSize(file, &high);

	if ((low == 0xFFFFFFFF) && (GetLastError() != NO_ERROR)) {
		return(FALSE);
	}

	*size = low;
	*size_high = high;

	return(TRUE);
#else
unknown's avatar
Merge  
unknown committed
1600 1601 1602 1603
	off_t	offs;

	offs = lseek(file, 0, SEEK_END);

unknown's avatar
unknown committed
1604 1605 1606 1607 1608
	if (offs == ((off_t)-1)) {

		return(FALSE);
	}
	
unknown's avatar
Merge  
unknown committed
1609
	if (sizeof(off_t) > 4) {
unknown's avatar
unknown committed
1610
	        *size = (ulint)(offs & 0xFFFFFFFFUL);
1611
		*size_high = (ulint)(offs >> 32);
unknown's avatar
Merge  
unknown committed
1612 1613 1614 1615
	} else {
		*size = (ulint) offs;
		*size_high = 0;
	}
1616 1617 1618 1619 1620
	
	return(TRUE);	
#endif
}

1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643
/***************************************************************************
Gets file size as a 64-bit integer ib_longlong. */

ib_longlong
os_file_get_size_as_iblonglong(
/*===========================*/
				/* out: size in bytes, -1 if error */
	os_file_t	file)	/* in: handle to a file */
{
	ulint	size;
	ulint	size_high;
	ibool	success;

	success = os_file_get_size(file, &size, &size_high);

	if (!success) {

		return(-1);
	}

	return((((ib_longlong)size_high) << 32) + (ib_longlong)size);
}

1644
/***************************************************************************
1645
Write the specified number of zeros to a newly created file. */
1646 1647 1648 1649 1650

ibool
os_file_set_size(
/*=============*/
				/* out: TRUE if success */
1651
	const char*	name,	/* in: name of the file or path as a
1652 1653 1654 1655 1656 1657
				null-terminated string */
	os_file_t	file,	/* in: handle to a file */
	ulint		size,	/* in: least significant 32 bits of file
				size */
	ulint		size_high)/* in: most significant 32 bits of size */
{
1658 1659
	ib_longlong	current_size;
	ib_longlong	desired_size;
unknown's avatar
Merge  
unknown committed
1660 1661
	ibool		ret;
	byte*   	buf;
unknown's avatar
unknown committed
1662
	byte*   	buf2;
1663
	ulint		buf_size;
unknown's avatar
Merge  
unknown committed
1664

1665
	ut_a(size == (size & 0xFFFFFFFF));
1666

1667 1668
	current_size = 0;
	desired_size = (ib_longlong)size + (((ib_longlong)size_high) << 32);
1669

1670
	/* Write up to 1 megabyte at a time. */
unknown's avatar
unknown committed
1671 1672
	buf_size = ut_min(64, (ulint) (desired_size / UNIV_PAGE_SIZE))
							* UNIV_PAGE_SIZE;
1673
	buf2 = ut_malloc(buf_size + UNIV_PAGE_SIZE);
unknown's avatar
unknown committed
1674 1675 1676

	/* Align the buffer for possible raw i/o */
	buf = ut_align(buf2, UNIV_PAGE_SIZE);
1677 1678

	/* Write buffer full of zeros */
1679
	memset(buf, 0, buf_size);
unknown's avatar
unknown committed
1680

1681
	if (desired_size >= (ib_longlong)(100 * 1024 * 1024)) {
1682
				
unknown's avatar
unknown committed
1683 1684 1685
		fprintf(stderr, "InnoDB: Progress in MB:");
	}

1686
	while (current_size < desired_size) {
unknown's avatar
unknown committed
1687 1688 1689 1690 1691 1692 1693 1694
		ulint	n_bytes;

		if (desired_size - current_size < (ib_longlong) buf_size) {
			n_bytes = (ulint) (desired_size - current_size);
		} else {
			n_bytes = buf_size;
		}

unknown's avatar
Merge  
unknown committed
1695
	        ret = os_file_write(name, file, buf,
1696 1697
				(ulint)(current_size & 0xFFFFFFFF),
				    (ulint)(current_size >> 32),
unknown's avatar
Merge  
unknown committed
1698
				n_bytes);
1699
	        if (!ret) {
unknown's avatar
unknown committed
1700
			ut_free(buf2);
1701 1702
	         	goto error_handling;
	        }
unknown's avatar
unknown committed
1703 1704
				
		/* Print about progress for each 100 MB written */
1705 1706
		if ((current_size + n_bytes) / (ib_longlong)(100 * 1024 * 1024)
		    != current_size / (ib_longlong)(100 * 1024 * 1024)) {
unknown's avatar
unknown committed
1707 1708

		        fprintf(stderr, " %lu00",
1709
				(ulong) ((current_size + n_bytes)
unknown's avatar
unknown committed
1710 1711 1712
					/ (ib_longlong)(100 * 1024 * 1024)));
		}
		
1713
	        current_size += n_bytes;
1714 1715
	}

1716
	if (desired_size >= (ib_longlong)(100 * 1024 * 1024)) {
unknown's avatar
unknown committed
1717 1718 1719 1720
				
		fprintf(stderr, "\n");
	}

unknown's avatar
unknown committed
1721
	ut_free(buf2);
1722 1723 1724 1725 1726 1727 1728 1729

	ret = os_file_flush(file);

	if (ret) {
	        return(TRUE);
	}

error_handling:
1730
	return(FALSE);
1731 1732 1733
}

/***************************************************************************
1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749
Truncates a file at its current position. */

ibool
os_file_set_eof(
/*============*/
				/* out: TRUE if success */
	FILE*		file)	/* in: file to be truncated */
{
#ifdef __WIN__
	HANDLE h = (HANDLE) _get_osfhandle(fileno(file));
	return(SetEndOfFile(h));
#else /* __WIN__ */
	return(!ftruncate(fileno(file), ftell(file)));
#endif /* __WIN__ */
}

1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763
/***************************************************************************
Flushes the write buffers of a given file to the disk. */

ibool
os_file_flush(
/*==========*/
				/* out: TRUE if success */
	os_file_t	file)	/* in, own: handle to a file */
{
#ifdef __WIN__
	BOOL	ret;

	ut_a(file);

unknown's avatar
unknown committed
1764 1765
	os_n_fsyncs++;

1766 1767 1768 1769 1770 1771
	ret = FlushFileBuffers(file);

	if (ret) {
		return(TRUE);
	}

unknown's avatar
unknown committed
1772 1773 1774 1775 1776 1777 1778 1779 1780
	/* Since Windows returns ERROR_INVALID_FUNCTION if the 'file' is
	actually a raw device, we choose to ignore that error if we are using
	raw disks */

	if (srv_start_raw_disk_in_use && GetLastError()
						== ERROR_INVALID_FUNCTION) {
	        return(TRUE);
	}

1781
	os_file_handle_error(NULL, "flush");
1782

unknown's avatar
unknown committed
1783 1784
	/* It is a fatal error if a file flush does not succeed, because then
	the database can get corrupt on disk */
1785
	ut_error;
unknown's avatar
unknown committed
1786

1787 1788 1789
	return(FALSE);
#else
	int	ret;
1790

1791 1792 1793 1794 1795 1796 1797
#if defined(HAVE_DARWIN_THREADS)
# ifndef F_FULLFSYNC
	/* The following definition is from the Mac OS X 10.3 <sys/fcntl.h> */
#  define F_FULLFSYNC 51 /* fsync + ask the drive to flush to the media */
# elif F_FULLFSYNC != 51
#  error "F_FULLFSYNC != 51: ABI incompatibility with Mac OS X 10.3"
# endif
unknown's avatar
unknown committed
1798 1799 1800 1801 1802
	/* Apple has disabled fsync() for internal disk drives in OS X. That
	caused corruption for a user when he tested a power outage. Let us in
	OS X use a nonstandard flush method recommended by an Apple
	engineer. */

1803 1804 1805
	if (!srv_have_fullfsync) {
		/* If we are not on an operating system that supports this,
		then fall back to a plain fsync. */ 
unknown's avatar
unknown committed
1806 1807

		ret = fsync(file);
1808 1809 1810 1811 1812 1813 1814 1815
	} else {
		ret = fcntl(file, F_FULLFSYNC, NULL);

		if (ret) {
			/* If we are not on a file system that supports this,
			then fall back to a plain fsync. */ 
			ret = fsync(file);
		}
unknown's avatar
unknown committed
1816 1817
	}
#elif HAVE_FDATASYNC
1818 1819
	ret = fdatasync(file);
#else
1820
/*	fprintf(stderr, "Flushing to file %p\n", file); */
1821
	ret = fsync(file);
1822
#endif
1823 1824
	os_n_fsyncs++;

1825 1826 1827 1828
	if (ret == 0) {
		return(TRUE);
	}
	
unknown's avatar
unknown committed
1829
	/* Since Linux returns EINVAL if the 'file' is actually a raw device,
unknown's avatar
unknown committed
1830 1831 1832
	we choose to ignore that error if we are using raw disks */

	if (srv_start_raw_disk_in_use && errno == EINVAL) {
unknown's avatar
unknown committed
1833 1834 1835 1836

	        return(TRUE);
	}

unknown's avatar
unknown committed
1837 1838
	ut_print_timestamp(stderr);
	
1839
	fprintf(stderr,
unknown's avatar
unknown committed
1840
		"  InnoDB: Error: the OS said file flush did not succeed\n");
1841

1842
	os_file_handle_error(NULL, "flush");
1843

unknown's avatar
unknown committed
1844 1845
	/* It is a fatal error if a file flush does not succeed, because then
	the database can get corrupt on disk */
1846
	ut_error;
unknown's avatar
unknown committed
1847

1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862
	return(FALSE);
#endif
}

#ifndef __WIN__
/***********************************************************************
Does a synchronous read operation in Posix. */
static
ssize_t
os_file_pread(
/*==========*/
				/* out: number of bytes read, -1 if error */
	os_file_t	file,	/* in: handle to a file */
	void*		buf,	/* in: buffer where to read */
	ulint		n,	/* in: number of bytes to read */	
unknown's avatar
Merge  
unknown committed
1863 1864 1865 1866
	ulint		offset,	/* in: least significant 32 bits of file
				offset from where to read */
	ulint		offset_high) /* in: most significant 32 bits of
				offset */
1867
{
unknown's avatar
Merge  
unknown committed
1868
        off_t	offs;
unknown's avatar
unknown committed
1869
	ssize_t	n_bytes;
unknown's avatar
Merge  
unknown committed
1870

unknown's avatar
unknown committed
1871
	ut_a((offset & 0xFFFFFFFFUL) == offset);
unknown's avatar
Merge  
unknown committed
1872 1873 1874 1875 1876
        
        /* If off_t is > 4 bytes in size, then we assume we can pass a
	64-bit address */

        if (sizeof(off_t) > 4) {
1877 1878
	        offs = (off_t)offset + (((off_t)offset_high) << 32);
        				
unknown's avatar
Merge  
unknown committed
1879 1880 1881 1882 1883 1884 1885 1886
        } else {
        	offs = (off_t)offset;

        	if (offset_high > 0) {
        		fprintf(stderr,
			"InnoDB: Error: file read at offset > 4 GB\n");
		}
        }
1887

1888 1889
	os_n_file_reads++;

unknown's avatar
unknown committed
1890
#if defined(HAVE_PREAD) && !defined(HAVE_BROKEN_PREAD)
unknown's avatar
unknown committed
1891 1892 1893 1894
        os_mutex_enter(os_file_count_mutex);
	os_file_n_pending_preads++;
        os_mutex_exit(os_file_count_mutex);

unknown's avatar
unknown committed
1895
        n_bytes = pread(file, buf, (ssize_t)n, offs);
unknown's avatar
unknown committed
1896 1897 1898 1899 1900 1901

        os_mutex_enter(os_file_count_mutex);
	os_file_n_pending_preads--;
        os_mutex_exit(os_file_count_mutex);

	return(n_bytes);
1902
#else
unknown's avatar
unknown committed
1903
	{
unknown's avatar
unknown committed
1904
	off_t	ret_offset;
1905 1906 1907 1908 1909 1910 1911 1912
	ssize_t	ret;
	ulint	i;

	/* Protect the seek / read operation with a mutex */
	i = ((ulint) file) % OS_FILE_N_SEEK_MUTEXES;
	
	os_mutex_enter(os_file_seek_mutexes[i]);

unknown's avatar
unknown committed
1913
	ret_offset = lseek(file, offs, SEEK_SET);
1914

unknown's avatar
unknown committed
1915
	if (ret_offset < 0) {
1916 1917
		os_mutex_exit(os_file_seek_mutexes[i]);

unknown's avatar
unknown committed
1918
		return(-1);
1919 1920
	}
	
unknown's avatar
unknown committed
1921
	ret = read(file, buf, (ssize_t)n);
1922 1923 1924 1925

	os_mutex_exit(os_file_seek_mutexes[i]);

	return(ret);
unknown's avatar
unknown committed
1926
	}
1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937
#endif
}

/***********************************************************************
Does a synchronous write operation in Posix. */
static
ssize_t
os_file_pwrite(
/*===========*/
				/* out: number of bytes written, -1 if error */
	os_file_t	file,	/* in: handle to a file */
1938
	const void*	buf,	/* in: buffer from where to write */
1939
	ulint		n,	/* in: number of bytes to write */	
unknown's avatar
Merge  
unknown committed
1940 1941 1942 1943
	ulint		offset,	/* in: least significant 32 bits of file
				offset where to write */
	ulint		offset_high) /* in: most significant 32 bits of
				offset */
1944
{
1945
	ssize_t	ret;
unknown's avatar
Merge  
unknown committed
1946 1947
        off_t	offs;

unknown's avatar
unknown committed
1948
	ut_a((offset & 0xFFFFFFFFUL) == offset);
unknown's avatar
Merge  
unknown committed
1949 1950 1951 1952 1953

        /* If off_t is > 4 bytes in size, then we assume we can pass a
	64-bit address */

        if (sizeof(off_t) > 4) {
unknown's avatar
unknown committed
1954
	  	offs = (off_t)offset + (((off_t)offset_high) << 32);
unknown's avatar
Merge  
unknown committed
1955 1956 1957 1958 1959 1960 1961 1962
        } else {
        	offs = (off_t)offset;

        	if (offset_high > 0) {
        		fprintf(stderr,
			"InnoDB: Error: file write at offset > 4 GB\n");
		}
        }
1963

1964 1965
	os_n_file_writes++;

unknown's avatar
unknown committed
1966
#if defined(HAVE_PWRITE) && !defined(HAVE_BROKEN_PREAD)
unknown's avatar
unknown committed
1967 1968 1969 1970
        os_mutex_enter(os_file_count_mutex);
	os_file_n_pending_pwrites++;
        os_mutex_exit(os_file_count_mutex);

unknown's avatar
unknown committed
1971
	ret = pwrite(file, buf, (ssize_t)n, offs);
1972

unknown's avatar
unknown committed
1973 1974 1975 1976
        os_mutex_enter(os_file_count_mutex);
	os_file_n_pending_pwrites--;
        os_mutex_exit(os_file_count_mutex);

1977
	if (srv_unix_file_flush_method != SRV_UNIX_LITTLESYNC
1978
	    && srv_unix_file_flush_method != SRV_UNIX_NOSYNC
unknown's avatar
unknown committed
1979 1980
	    && !os_do_not_call_flush_at_each_write) {
	    	
1981 1982 1983
	        /* Always do fsync to reduce the probability that when
                the OS crashes, a database page is only partially
                physically written to disk. */
1984

1985 1986
	        ut_a(TRUE == os_file_flush(file));
	}
1987 1988

        return(ret);
1989
#else
unknown's avatar
unknown committed
1990
	{
unknown's avatar
unknown committed
1991
	off_t	ret_offset;
1992 1993 1994 1995 1996 1997 1998
	ulint	i;

	/* Protect the seek / write operation with a mutex */
	i = ((ulint) file) % OS_FILE_N_SEEK_MUTEXES;
	
	os_mutex_enter(os_file_seek_mutexes[i]);

unknown's avatar
unknown committed
1999
	ret_offset = lseek(file, offs, SEEK_SET);
2000

unknown's avatar
unknown committed
2001
	if (ret_offset < 0) {
2002 2003
		os_mutex_exit(os_file_seek_mutexes[i]);

unknown's avatar
unknown committed
2004
		return(-1);
2005 2006
	}
	
unknown's avatar
unknown committed
2007
	ret = write(file, buf, (ssize_t)n);
2008

2009
	if (srv_unix_file_flush_method != SRV_UNIX_LITTLESYNC
2010
	    && srv_unix_file_flush_method != SRV_UNIX_NOSYNC
unknown's avatar
unknown committed
2011
	    && !os_do_not_call_flush_at_each_write) {
2012

2013 2014 2015 2016 2017 2018
	        /* Always do fsync to reduce the probability that when
                the OS crashes, a database page is only partially
                physically written to disk. */

	        ut_a(TRUE == os_file_flush(file));
	}
2019

2020 2021 2022
	os_mutex_exit(os_file_seek_mutexes[i]);

	return(ret);
unknown's avatar
unknown committed
2023
	}
2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052
#endif
}
#endif

/***********************************************************************
Requests a synchronous positioned read operation. */

ibool
os_file_read(
/*=========*/
				/* out: TRUE if request was
				successful, FALSE if fail */
	os_file_t	file,	/* in: handle to a file */
	void*		buf,	/* in: buffer where to read */
	ulint		offset,	/* in: least significant 32 bits of file
				offset where to read */
	ulint		offset_high, /* in: most significant 32 bits of
				offset */
	ulint		n)	/* in: number of bytes to read */	
{
#ifdef __WIN__
	BOOL		ret;
	DWORD		len;
	DWORD		ret2;
	DWORD		low;
	DWORD		high;
	ibool		retry;
	ulint		i;
	
unknown's avatar
unknown committed
2053
	ut_a((offset & 0xFFFFFFFFUL) == offset);
unknown's avatar
Merge  
unknown committed
2054

2055
	os_n_file_reads++;
unknown's avatar
unknown committed
2056
	os_bytes_read_since_printout += n;
2057

2058 2059 2060 2061 2062
try_again:	
	ut_ad(file);
	ut_ad(buf);
	ut_ad(n > 0);

2063 2064
	low = (DWORD) offset;
	high = (DWORD) offset_high;
2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079

	/* Protect the seek / read operation with a mutex */
	i = ((ulint) file) % OS_FILE_N_SEEK_MUTEXES;
	
	os_mutex_enter(os_file_seek_mutexes[i]);

	ret2 = SetFilePointer(file, low, &high, FILE_BEGIN);

	if (ret2 == 0xFFFFFFFF && GetLastError() != NO_ERROR) {

		os_mutex_exit(os_file_seek_mutexes[i]);

		goto error_handling;
	} 
	
2080
	ret = ReadFile(file, buf, (DWORD) n, &len, NULL);
2081 2082 2083 2084 2085 2086 2087 2088 2089

	os_mutex_exit(os_file_seek_mutexes[i]);
	
	if (ret && len == n) {
		return(TRUE);
	}		
#else
	ibool	retry;
	ssize_t	ret;
unknown's avatar
Merge  
unknown committed
2090

unknown's avatar
unknown committed
2091 2092
	os_bytes_read_since_printout += n;

2093
try_again:
unknown's avatar
Merge  
unknown committed
2094
	ret = os_file_pread(file, buf, n, offset, offset_high);
2095

2096
	if ((ulint)ret == n) {
2097 2098 2099

		return(TRUE);
	}
unknown's avatar
unknown committed
2100 2101 2102 2103 2104

	fprintf(stderr,
"InnoDB: Error: tried to read %lu bytes at offset %lu %lu.\n"
"InnoDB: Was only able to read %ld.\n", (ulong)n, (ulong)offset_high,
					(ulong)offset, (long)ret);
2105
#endif	
unknown's avatar
unknown committed
2106
#ifdef __WIN__
2107
error_handling:
unknown's avatar
unknown committed
2108
#endif
2109
	retry = os_file_handle_error(NULL, "read"); 
2110 2111 2112 2113

	if (retry) {
		goto try_again;
	}
unknown's avatar
unknown committed
2114 2115 2116 2117
       
	fprintf(stderr,
"InnoDB: Fatal error: cannot read from file. OS error number %lu.\n",
#ifdef __WIN__
2118
		(ulong) GetLastError()
unknown's avatar
unknown committed
2119
#else
2120
		(ulong) errno
unknown's avatar
unknown committed
2121 2122 2123 2124
#endif
		);
	fflush(stderr);

2125 2126 2127 2128 2129
	ut_error;

	return(FALSE);
}

unknown's avatar
unknown committed
2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165
/***********************************************************************
Requests a synchronous positioned read operation. This function does not do
any error handling. In case of error it returns FALSE. */

ibool
os_file_read_no_error_handling(
/*===========================*/
				/* out: TRUE if request was
				successful, FALSE if fail */
	os_file_t	file,	/* in: handle to a file */
	void*		buf,	/* in: buffer where to read */
	ulint		offset,	/* in: least significant 32 bits of file
				offset where to read */
	ulint		offset_high, /* in: most significant 32 bits of
				offset */
	ulint		n)	/* in: number of bytes to read */	
{
#ifdef __WIN__
	BOOL		ret;
	DWORD		len;
	DWORD		ret2;
	DWORD		low;
	DWORD		high;
	ibool		retry;
	ulint		i;
	
	ut_a((offset & 0xFFFFFFFFUL) == offset);

	os_n_file_reads++;
	os_bytes_read_since_printout += n;

try_again:	
	ut_ad(file);
	ut_ad(buf);
	ut_ad(n > 0);

2166 2167
	low = (DWORD) offset;
	high = (DWORD) offset_high;
unknown's avatar
unknown committed
2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182

	/* Protect the seek / read operation with a mutex */
	i = ((ulint) file) % OS_FILE_N_SEEK_MUTEXES;
	
	os_mutex_enter(os_file_seek_mutexes[i]);

	ret2 = SetFilePointer(file, low, &high, FILE_BEGIN);

	if (ret2 == 0xFFFFFFFF && GetLastError() != NO_ERROR) {

		os_mutex_exit(os_file_seek_mutexes[i]);

		goto error_handling;
	} 
	
2183
	ret = ReadFile(file, buf, (DWORD) n, &len, NULL);
unknown's avatar
unknown committed
2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206

	os_mutex_exit(os_file_seek_mutexes[i]);
	
	if (ret && len == n) {
		return(TRUE);
	}		
#else
	ibool	retry;
	ssize_t	ret;

	os_bytes_read_since_printout += n;

try_again:
	ret = os_file_pread(file, buf, n, offset, offset_high);

	if ((ulint)ret == n) {

		return(TRUE);
	}
#endif	
#ifdef __WIN__
error_handling:
#endif
unknown's avatar
unknown committed
2207
	retry = os_file_handle_error_no_exit(NULL, "read"); 
unknown's avatar
unknown committed
2208 2209 2210 2211 2212 2213 2214 2215

	if (retry) {
		goto try_again;
	}
       
	return(FALSE);
}

2216 2217 2218 2219 2220 2221 2222 2223
/***********************************************************************
Requests a synchronous write operation. */

ibool
os_file_write(
/*==========*/
				/* out: TRUE if request was
				successful, FALSE if fail */
2224
	const char*	name,	/* in: name of the file or path as a
2225 2226
				null-terminated string */
	os_file_t	file,	/* in: handle to a file */
2227
	const void*	buf,	/* in: buffer from which to write */
2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240
	ulint		offset,	/* in: least significant 32 bits of file
				offset where to write */
	ulint		offset_high, /* in: most significant 32 bits of
				offset */
	ulint		n)	/* in: number of bytes to write */	
{
#ifdef __WIN__
	BOOL		ret;
	DWORD		len;
	DWORD		ret2;
	DWORD		low;
	DWORD		high;
	ulint		i;
unknown's avatar
unknown committed
2241
	ulint		n_retries	= 0;
2242
	ulint		err;
2243

2244
	ut_a((offset & 0xFFFFFFFF) == offset);
unknown's avatar
Merge  
unknown committed
2245

2246
	os_n_file_writes++;
unknown's avatar
unknown committed
2247

2248 2249 2250
	ut_ad(file);
	ut_ad(buf);
	ut_ad(n > 0);
unknown's avatar
unknown committed
2251
retry:
2252 2253
	low = (DWORD) offset;
	high = (DWORD) offset_high;
2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265
	
	/* Protect the seek / write operation with a mutex */
	i = ((ulint) file) % OS_FILE_N_SEEK_MUTEXES;
	
	os_mutex_enter(os_file_seek_mutexes[i]);

	ret2 = SetFilePointer(file, low, &high, FILE_BEGIN);

	if (ret2 == 0xFFFFFFFF && GetLastError() != NO_ERROR) {

		os_mutex_exit(os_file_seek_mutexes[i]);
		
unknown's avatar
unknown committed
2266 2267 2268 2269
		ut_print_timestamp(stderr);

		fprintf(stderr,
"  InnoDB: Error: File pointer positioning to file %s failed at\n"
unknown's avatar
unknown committed
2270
"InnoDB: offset %lu %lu. Operating system error number %lu.\n"
2271 2272 2273
"InnoDB: Some operating system error numbers are described at\n"
"InnoDB: "
"http://dev.mysql.com/doc/mysql/en/Operating_System_error_codes.html\n",
2274 2275
			name, (ulong) offset_high, (ulong) offset,
			(ulong) GetLastError());
unknown's avatar
unknown committed
2276 2277

		return(FALSE);
2278 2279
	} 

2280
	ret = WriteFile(file, buf, (DWORD) n, &len, NULL);
2281 2282 2283 2284
	
	/* Always do fsync to reduce the probability that when the OS crashes,
	a database page is only partially physically written to disk. */

unknown's avatar
unknown committed
2285
	if (!os_do_not_call_flush_at_each_write) {
2286 2287
		ut_a(TRUE == os_file_flush(file));
	}
2288 2289

	os_mutex_exit(os_file_seek_mutexes[i]);
2290

2291
	if (ret && len == n) {
unknown's avatar
unknown committed
2292

2293 2294
		return(TRUE);
	}
unknown's avatar
unknown committed
2295

unknown's avatar
unknown committed
2296 2297 2298
	/* If some background file system backup tool is running, then, at
	least in Windows 2000, we may get here a specific error. Let us
	retry the operation 100 times, with 1 second waits. */
unknown's avatar
unknown committed
2299
	
unknown's avatar
unknown committed
2300
	if (GetLastError() == ERROR_LOCK_VIOLATION && n_retries < 100) {
unknown's avatar
unknown committed
2301

unknown's avatar
unknown committed
2302 2303
		os_thread_sleep(1000000);
	
unknown's avatar
unknown committed
2304 2305 2306 2307 2308
		n_retries++;

		goto retry;
	}	
	
unknown's avatar
unknown committed
2309 2310
	if (!os_has_said_disk_full) {
	
2311 2312
		err = (ulint)GetLastError();

unknown's avatar
unknown committed
2313 2314 2315 2316 2317 2318 2319
		ut_print_timestamp(stderr);

		fprintf(stderr,
"  InnoDB: Error: Write to file %s failed at offset %lu %lu.\n"
"InnoDB: %lu bytes should have been written, only %lu were written.\n"
"InnoDB: Operating system error number %lu.\n"
"InnoDB: Check that your OS and file system support files of this size.\n"
unknown's avatar
unknown committed
2320
"InnoDB: Check also that the disk is not full or a disk quota exceeded.\n",
2321 2322
			name, (ulong) offset_high, (ulong) offset,
			(ulong) n, (ulong) len, (ulong) err);
2323 2324 2325

		if (strerror((int)err) != NULL) {
			fprintf(stderr,
2326
"InnoDB: Error number %lu means '%s'.\n", (ulong) err, strerror((int)err));
2327 2328 2329
		}

		fprintf(stderr,
2330 2331 2332
"InnoDB: Some operating system error numbers are described at\n"
"InnoDB: "
"http://dev.mysql.com/doc/mysql/en/Operating_System_error_codes.html\n");
unknown's avatar
unknown committed
2333 2334 2335 2336 2337

		os_has_said_disk_full = TRUE;
	}

	return(FALSE);
2338 2339 2340
#else
	ssize_t	ret;
	
unknown's avatar
Merge  
unknown committed
2341
	ret = os_file_pwrite(file, buf, n, offset, offset_high);
2342

2343
	if ((ulint)ret == n) {
unknown's avatar
unknown committed
2344

2345 2346 2347
		return(TRUE);
	}

unknown's avatar
unknown committed
2348
	if (!os_has_said_disk_full) {
2349
	
unknown's avatar
unknown committed
2350
		ut_print_timestamp(stderr);
2351

unknown's avatar
unknown committed
2352 2353
		fprintf(stderr,
"  InnoDB: Error: Write to file %s failed at offset %lu %lu.\n"
unknown's avatar
unknown committed
2354
"InnoDB: %lu bytes should have been written, only %ld were written.\n"
unknown's avatar
unknown committed
2355 2356
"InnoDB: Operating system error number %lu.\n"
"InnoDB: Check that your OS and file system support files of this size.\n"
unknown's avatar
unknown committed
2357
"InnoDB: Check also that the disk is not full or a disk quota exceeded.\n",
unknown's avatar
unknown committed
2358
			name, offset_high, offset, n, (long int)ret,
unknown's avatar
unknown committed
2359
							(ulint)errno);
2360 2361 2362 2363 2364 2365
		if (strerror(errno) != NULL) {
			fprintf(stderr,
"InnoDB: Error number %lu means '%s'.\n", (ulint)errno, strerror(errno));
		}

		fprintf(stderr,
2366 2367 2368
"InnoDB: Some operating system error numbers are described at\n"
"InnoDB: "
"http://dev.mysql.com/doc/mysql/en/Operating_System_error_codes.html\n");
2369

unknown's avatar
unknown committed
2370 2371 2372 2373 2374
		os_has_said_disk_full = TRUE;
	}

	return(FALSE);	
#endif
2375 2376
}

unknown's avatar
unknown committed
2377 2378 2379 2380 2381 2382 2383
/***********************************************************************
Check the existence and type of the given file. */

ibool
os_file_status(
/*===========*/
				/* out: TRUE if call succeeded */
2384
	const char*	path,	/* in:  pathname of the file */
unknown's avatar
unknown committed
2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399
	ibool*		exists,	/* out: TRUE if file exists */
	os_file_type_t* type)	/* out: type of the file (if it exists) */
{
#ifdef __WIN__
	int		ret;
	struct _stat	statinfo;
	
	ret = _stat(path, &statinfo);
	if (ret && (errno == ENOENT || errno == ENOTDIR)) {
		/* file does not exist */
		*exists = FALSE;
		return(TRUE);
	} else if (ret) {
		/* file exists, but stat call failed */
		
unknown's avatar
unknown committed
2400
		os_file_handle_error_no_exit(path, "stat");
unknown's avatar
unknown committed
2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427
		
		return(FALSE);
	}
	    
	if (_S_IFDIR & statinfo.st_mode) {
		*type = OS_FILE_TYPE_DIR;
	} else if (_S_IFREG & statinfo.st_mode) {
	        *type = OS_FILE_TYPE_FILE;
	} else {
	        *type = OS_FILE_TYPE_UNKNOWN;
	}

	*exists = TRUE;
	
	return(TRUE);
#else
	int		ret;
	struct stat	statinfo;
	
	ret = stat(path, &statinfo);
	if (ret && (errno == ENOENT || errno == ENOTDIR)) {
		/* file does not exist */
		*exists = FALSE;
		return(TRUE);
	} else if (ret) {
		/* file exists, but stat call failed */
		
unknown's avatar
unknown committed
2428
		os_file_handle_error_no_exit(path, "stat");
unknown's avatar
unknown committed
2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448
		
		return(FALSE);
	}
	    
	if (S_ISDIR(statinfo.st_mode)) {
		*type = OS_FILE_TYPE_DIR;
	} else if (S_ISLNK(statinfo.st_mode)) {
	        *type = OS_FILE_TYPE_LINK;
	} else if (S_ISREG(statinfo.st_mode)) {
	        *type = OS_FILE_TYPE_FILE;
	} else {
	        *type = OS_FILE_TYPE_UNKNOWN;
	}

	*exists = TRUE;
	
	return(TRUE);
#endif
}

2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470
/***********************************************************************
This function returns information about the specified file */

ibool
os_file_get_status(
/*===========*/
				/* out: TRUE if stat information found */
	const char*	path,	/* in:  pathname of the file */
	os_file_stat_t* stat_info) /* information of a file in a directory */
{
#ifdef __WIN__
	int		ret;
	struct _stat	statinfo;
	
	ret = _stat(path, &statinfo);
	if (ret && (errno == ENOENT || errno == ENOTDIR)) {
		/* file does not exist */

		return(FALSE);
	} else if (ret) {
		/* file exists, but stat call failed */
		
unknown's avatar
unknown committed
2471
		os_file_handle_error_no_exit(path, "stat");
2472 2473 2474 2475 2476 2477 2478 2479
		
		return(FALSE);
	}
	if (_S_IFDIR & statinfo.st_mode) {
		stat_info->type = OS_FILE_TYPE_DIR;
	} else if (_S_IFREG & statinfo.st_mode) {
	        stat_info->type = OS_FILE_TYPE_FILE;
	} else {
2480
	        stat_info->type = OS_FILE_TYPE_UNKNOWN;
2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501
	}

	stat_info->ctime = statinfo.st_ctime;
	stat_info->atime = statinfo.st_atime;
	stat_info->mtime = statinfo.st_mtime;
	stat_info->size  = statinfo.st_size;
	
	return(TRUE);
#else
	int		ret;
	struct stat	statinfo;
	
	ret = stat(path, &statinfo);

	if (ret && (errno == ENOENT || errno == ENOTDIR)) {
		/* file does not exist */

		return(FALSE);
	} else if (ret) {
		/* file exists, but stat call failed */
		
unknown's avatar
unknown committed
2502
		os_file_handle_error_no_exit(path, "stat");
2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525
		
		return(FALSE);
	}
	    
	if (S_ISDIR(statinfo.st_mode)) {
		stat_info->type = OS_FILE_TYPE_DIR;
	} else if (S_ISLNK(statinfo.st_mode)) {
	        stat_info->type = OS_FILE_TYPE_LINK;
	} else if (S_ISREG(statinfo.st_mode)) {
	        stat_info->type = OS_FILE_TYPE_FILE;
	} else {
	        stat_info->type = OS_FILE_TYPE_UNKNOWN;
	}

	stat_info->ctime = statinfo.st_ctime;
	stat_info->atime = statinfo.st_atime;
	stat_info->mtime = statinfo.st_mtime;
	stat_info->size  = statinfo.st_size;
	
	return(TRUE);
#endif
}

unknown's avatar
unknown committed
2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565
/* path name separator character */
#ifdef __WIN__
#  define OS_FILE_PATH_SEPARATOR	'\\'
#else
#  define OS_FILE_PATH_SEPARATOR	'/'
#endif

/********************************************************************
The function os_file_dirname returns a directory component of a
null-terminated pathname string.  In the usual case, dirname returns
the string up to, but not including, the final '/', and basename
is the component following the final '/'.  Trailing '/' charac­
ters are not counted as part of the pathname.

If path does not contain a slash, dirname returns the string ".".

Concatenating the string returned by dirname, a "/", and the basename
yields a complete pathname.

The return value is  a copy of the directory component of the pathname.
The copy is allocated from heap. It is the caller responsibility
to free it after it is no longer needed.	

The following list of examples (taken from SUSv2) shows the strings
returned by dirname and basename for different paths:

       path           dirname        basename
       "/usr/lib"     "/usr"         "lib"
       "/usr/"        "/"            "usr"
       "usr"          "."            "usr"
       "/"            "/"            "/"
       "."            "."            "."
       ".."           "."            ".."
*/

char*
os_file_dirname(
/*============*/
				/* out, own: directory component of the
				pathname */
2566
	const char*	path)	/* in: pathname */
unknown's avatar
unknown committed
2567
{
unknown's avatar
unknown committed
2568
	/* Find the offset of the last slash */
2569 2570
	const char* last_slash = strrchr(path, OS_FILE_PATH_SEPARATOR);
	if (!last_slash) {
unknown's avatar
unknown committed
2571 2572
		/* No slash in the path, return "." */

2573
		return(mem_strdup("."));
unknown's avatar
unknown committed
2574 2575
	}

unknown's avatar
unknown committed
2576
	/* Ok, there is a slash */
unknown's avatar
unknown committed
2577

2578
	if (last_slash == path) {
unknown's avatar
unknown committed
2579
		/* last slash is the first char of the path */
unknown's avatar
unknown committed
2580

2581
		return(mem_strdup("/"));
unknown's avatar
unknown committed
2582 2583
	}

unknown's avatar
unknown committed
2584 2585
	/* Non-trivial directory component */

2586
	return(mem_strdupl(path, last_slash - path));
unknown's avatar
unknown committed
2587 2588 2589 2590 2591 2592 2593 2594 2595 2596
}
	
/********************************************************************
Creates all missing subdirectories along the given path. */
	
ibool
os_file_create_subdirs_if_needed(
/*=============================*/
				/* out: TRUE if call succeeded
				   FALSE otherwise */
2597
	const char*	path)	/* in: path name */
unknown's avatar
unknown committed
2598 2599 2600 2601 2602 2603
{
	char*		subdir;
	ibool 		success, subdir_exists;
	os_file_type_t	type;

	subdir = os_file_dirname(path);
2604 2605
	if (strlen(subdir) == 1
	    && (*subdir == OS_FILE_PATH_SEPARATOR || *subdir == '.')) {
unknown's avatar
unknown committed
2606
		/* subdir is root or cwd, nothing to do */
unknown's avatar
unknown committed
2607 2608
		mem_free(subdir);

unknown's avatar
unknown committed
2609 2610 2611
		return(TRUE);
	}

unknown's avatar
unknown committed
2612
	/* Test if subdir exists */
unknown's avatar
unknown committed
2613 2614 2615 2616 2617
	success = os_file_status(subdir, &subdir_exists, &type);
	if (success && !subdir_exists) {
		/* subdir does not exist, create it */
		success = os_file_create_subdirs_if_needed(subdir);
		if (!success) {
unknown's avatar
unknown committed
2618 2619
			mem_free(subdir);

unknown's avatar
unknown committed
2620 2621 2622 2623 2624
			return(FALSE);
		}
		success = os_file_create_directory(subdir, FALSE);
	}

unknown's avatar
unknown committed
2625 2626
	mem_free(subdir);

unknown's avatar
unknown committed
2627 2628 2629
	return(success);
}

2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668
/********************************************************************
Returns a pointer to the nth slot in the aio array. */
static
os_aio_slot_t*
os_aio_array_get_nth_slot(
/*======================*/
					/* out: pointer to slot */
	os_aio_array_t*		array,	/* in: aio array */
	ulint			index)	/* in: index of the slot */
{
	ut_a(index < array->n_slots);

	return((array->slots) + index);
}

/****************************************************************************
Creates an aio wait array. */
static
os_aio_array_t*
os_aio_array_create(
/*================*/
				/* out, own: aio array */
	ulint	n,		/* in: maximum number of pending aio operations
				allowed; n must be divisible by n_segments */
	ulint	n_segments) 	/* in: number of segments in the aio array */
{
	os_aio_array_t*	array;
	ulint		i;
	os_aio_slot_t*	slot;
#ifdef WIN_ASYNC_IO
	OVERLAPPED*	over;
#endif	
	ut_a(n > 0);
	ut_a(n_segments > 0);

	array = ut_malloc(sizeof(os_aio_array_t));

	array->mutex 		= os_mutex_create(NULL);
	array->not_full		= os_event_create(NULL);
2669 2670 2671 2672
	array->is_empty		= os_event_create(NULL);

	os_event_set(array->is_empty);
	
2673 2674 2675 2676
	array->n_slots  	= n;
	array->n_segments	= n_segments;
	array->n_reserved	= 0;
	array->slots		= ut_malloc(n * sizeof(os_aio_slot_t));
2677 2678 2679
#ifdef __WIN__
	array->native_events	= ut_malloc(n * sizeof(os_native_event_t));
#endif	
2680 2681 2682 2683 2684 2685
	for (i = 0; i < n; i++) {
		slot = os_aio_array_get_nth_slot(array, i);

		slot->pos = i;
		slot->reserved = FALSE;
#ifdef WIN_ASYNC_IO
2686 2687
		slot->event = os_event_create(NULL);

2688 2689
		over = &(slot->control);

2690
		over->hEvent = slot->event->handle;
2691

2692
		*((array->native_events) + i) = over->hEvent;
2693 2694 2695 2696 2697 2698 2699
#endif
	}
	
	return(array);
}

/****************************************************************************
unknown's avatar
unknown committed
2700 2701
Initializes the asynchronous io system. Calls also os_io_init_simple.
Creates a separate aio array for
2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727
non-ibuf read and write, a third aio array for the ibuf i/o, with just one
segment, two aio arrays for log reads and writes with one segment, and a
synchronous aio array of the specified size. The combined number of segments
in the three first aio arrays is the parameter n_segments given to the
function. The caller must create an i/o handler thread for each segment in
the four first arrays, but not for the sync aio array. */

void
os_aio_init(
/*========*/
	ulint	n,		/* in: maximum number of pending aio operations
				allowed; n must be divisible by n_segments */
	ulint	n_segments,	/* in: combined number of segments in the four
				first aio arrays; must be >= 4 */
	ulint	n_slots_sync)	/* in: number of slots in the sync aio array */
{
	ulint	n_read_segs;
	ulint	n_write_segs;
	ulint	n_per_seg;
	ulint	i;
#ifdef POSIX_ASYNC_IO
	sigset_t   sigset;
#endif
	ut_ad(n % n_segments == 0);
	ut_ad(n_segments >= 4);

unknown's avatar
unknown committed
2728 2729
	os_io_init_simple();

unknown's avatar
unknown committed
2730
	for (i = 0; i < n_segments; i++) {
2731
	        srv_set_io_thread_op_info(i, "not started yet");
unknown's avatar
unknown committed
2732 2733
	}

2734 2735 2736 2737
	n_per_seg = n / n_segments;
	n_write_segs = (n_segments - 2) / 2;
	n_read_segs = n_segments - 2 - n_write_segs;
	
2738
	/* fprintf(stderr, "Array n per seg %lu\n", n_per_seg); */
2739

unknown's avatar
unknown committed
2740 2741
	os_aio_ibuf_array = os_aio_array_create(n_per_seg, 1);

2742
	srv_io_thread_function[0] = "insert buffer thread";
unknown's avatar
unknown committed
2743 2744 2745

	os_aio_log_array = os_aio_array_create(n_per_seg, 1);

2746
	srv_io_thread_function[1] = "log thread";
unknown's avatar
unknown committed
2747

2748 2749
	os_aio_read_array = os_aio_array_create(n_read_segs * n_per_seg,
							n_read_segs);
unknown's avatar
unknown committed
2750
	for (i = 2; i < 2 + n_read_segs; i++) {
unknown's avatar
unknown committed
2751
		ut_a(i < SRV_MAX_N_IO_THREADS);
2752
	        srv_io_thread_function[i] = "read thread";
unknown's avatar
unknown committed
2753 2754
	}

2755 2756
	os_aio_write_array = os_aio_array_create(n_write_segs * n_per_seg,
							n_write_segs);
unknown's avatar
unknown committed
2757
	for (i = 2 + n_read_segs; i < n_segments; i++) {
unknown's avatar
unknown committed
2758
		ut_a(i < SRV_MAX_N_IO_THREADS);
2759
	        srv_io_thread_function[i] = "write thread";
unknown's avatar
unknown committed
2760
	}
2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773

	os_aio_sync_array = os_aio_array_create(n_slots_sync, 1);

	os_aio_n_segments = n_segments;

	os_aio_validate();

	os_aio_segment_wait_events = ut_malloc(n_segments * sizeof(void*));

	for (i = 0; i < n_segments; i++) {
		os_aio_segment_wait_events[i] = os_event_create(NULL);
	}

2774 2775
	os_last_printout = time(NULL);

2776
#ifdef POSIX_ASYNC_IO
2777 2778 2779 2780 2781
	/* Block aio signals from the current thread and its children:
	for this to work, the current thread must be the first created
	in the database, so that all its children will inherit its
	signal mask */
	
2782 2783
	/* TODO: to work MySQL needs the SIGALARM signal; the following
	will not work yet! */
2784 2785 2786 2787 2788 2789
        sigemptyset(&sigset);
	sigaddset(&sigset, SIGRTMIN + 1 + 0);
	sigaddset(&sigset, SIGRTMIN + 1 + 1);
	sigaddset(&sigset, SIGRTMIN + 1 + 2);
	sigaddset(&sigset, SIGRTMIN + 1 + 3);

2790
	pthread_sigmask(SIG_BLOCK, &sigset, NULL); */
2791 2792
#endif
}
unknown's avatar
unknown committed
2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807

#ifdef WIN_ASYNC_IO
/****************************************************************************
Wakes up all async i/o threads in the array in Windows async i/o at
shutdown. */
static
void
os_aio_array_wake_win_aio_at_shutdown(
/*==================================*/
	os_aio_array_t*	array)	/* in: aio array */
{
	ulint	i;

	for (i = 0; i < array->n_slots; i++) {

2808
	        os_event_set((array->slots + i)->event);
unknown's avatar
unknown committed
2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836
	}
}
#endif

/****************************************************************************
Wakes up all async i/o threads so that they know to exit themselves in
shutdown. */

void
os_aio_wake_all_threads_at_shutdown(void)
/*=====================================*/
{
	ulint	i;

#ifdef WIN_ASYNC_IO
        /* This code wakes up all ai/o threads in Windows native aio */
	os_aio_array_wake_win_aio_at_shutdown(os_aio_read_array);
	os_aio_array_wake_win_aio_at_shutdown(os_aio_write_array);
	os_aio_array_wake_win_aio_at_shutdown(os_aio_ibuf_array);
	os_aio_array_wake_win_aio_at_shutdown(os_aio_log_array);
#endif
	/* This loop wakes up all simulated ai/o threads */

	for (i = 0; i < os_aio_n_segments; i++) {
	    	
		os_event_set(os_aio_segment_wait_events[i]);
	}	
}
2837
				
2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848
/****************************************************************************
Waits until there are no pending writes in os_aio_write_array. There can
be other, synchronous, pending writes. */

void
os_aio_wait_until_no_pending_writes(void)
/*=====================================*/
{
	os_event_wait(os_aio_write_array->is_empty);
}

2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924
/**************************************************************************
Calculates segment number for a slot. */
static
ulint
os_aio_get_segment_no_from_slot(
/*============================*/
				/* out: segment number (which is the number
				used by, for example, i/o-handler threads) */
	os_aio_array_t*	array,	/* in: aio wait array */
	os_aio_slot_t*	slot)	/* in: slot in this array */
{
	ulint	segment;
	ulint	seg_len;

	if (array == os_aio_ibuf_array) {
		segment = 0;

	} else if (array == os_aio_log_array) {
		segment = 1;
		
	} else if (array == os_aio_read_array) {
		seg_len = os_aio_read_array->n_slots /
				os_aio_read_array->n_segments;

		segment = 2 + slot->pos / seg_len;
	} else {
		ut_a(array == os_aio_write_array);
		seg_len = os_aio_write_array->n_slots /
				os_aio_write_array->n_segments;

		segment = os_aio_read_array->n_segments + 2
				+ slot->pos / seg_len;
	}

	return(segment);
}

/**************************************************************************
Calculates local segment number and aio array from global segment number. */
static
ulint
os_aio_get_array_and_local_segment(
/*===============================*/
					/* out: local segment number within
					the aio array */
	os_aio_array_t** array,		/* out: aio wait array */
	ulint		 global_segment)/* in: global segment number */
{
	ulint	segment;

	ut_a(global_segment < os_aio_n_segments);	

	if (global_segment == 0) {
		*array = os_aio_ibuf_array;
		segment = 0;

	} else if (global_segment == 1) {
		*array = os_aio_log_array;
		segment = 0;
		
	} else if (global_segment < os_aio_read_array->n_segments + 2) {
		*array = os_aio_read_array;

		segment = global_segment - 2;
	} else {
		*array = os_aio_write_array;

		segment = global_segment - (os_aio_read_array->n_segments + 2);
	}

	return(segment);
}

/***********************************************************************
Gets an integer value designating a specified aio array. This is used
to give numbers to signals in Posix aio. */
unknown's avatar
unknown committed
2925 2926

#if !defined(WIN_ASYNC_IO) && defined(POSIX_ASYNC_IO)
2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947
static
ulint
os_aio_get_array_no(
/*================*/
	os_aio_array_t*	array)	/* in: aio array */
{	
	if (array == os_aio_ibuf_array) {
	
		return(0);

	} else if (array == os_aio_log_array) {

		return(1);

	} else if (array == os_aio_read_array) {

		return(2);
	} else if (array == os_aio_write_array) {

		return(3);
	} else {
2948
		ut_error;
2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974

		return(0);
	}
}

/***********************************************************************
Gets the aio array for its number. */
static
os_aio_array_t*
os_aio_get_array_from_no(
/*=====================*/
			/* out: aio array */
	ulint	n)	/* in: array number */
{	
	if (n == 0) {
		return(os_aio_ibuf_array);
	} else if (n == 1) {

		return(os_aio_log_array);
	} else if (n == 2) {

		return(os_aio_read_array);
	} else if (n == 3) {

		return(os_aio_write_array);
	} else {
2975
		ut_error;
2976 2977 2978 2979

		return(NULL);
	}
}
unknown's avatar
unknown committed
2980
#endif /* if !defined(WIN_ASYNC_IO) && defined(POSIX_ASYNC_IO) */
2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996

/***********************************************************************
Requests for a slot in the aio array. If no slot is available, waits until
not_full-event becomes signaled. */
static
os_aio_slot_t*
os_aio_array_reserve_slot(
/*======================*/
				/* out: pointer to slot */
	ulint		type,	/* in: OS_FILE_READ or OS_FILE_WRITE */
	os_aio_array_t*	array,	/* in: aio array */
	void*		message1,/* in: message to be passed along with
				the aio operation */
	void*		message2,/* in: message to be passed along with
				the aio operation */
	os_file_t	file,	/* in: file handle */
2997
	const char*	name,	/* in: name of the file or path as a
2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043
				null-terminated string */
	void*		buf,	/* in: buffer where to read or from which
				to write */
	ulint		offset,	/* in: least significant 32 bits of file
				offset */
	ulint		offset_high, /* in: most significant 32 bits of
				offset */
	ulint		len)	/* in: length of the block to read or write */
{
	os_aio_slot_t*	slot;
#ifdef WIN_ASYNC_IO
	OVERLAPPED*	control;

#elif defined(POSIX_ASYNC_IO)

	struct aiocb*	control;
#endif
	ulint		i;
loop:
	os_mutex_enter(array->mutex);

	if (array->n_reserved == array->n_slots) {
		os_mutex_exit(array->mutex);

		if (!os_aio_use_native_aio) {
			/* If the handler threads are suspended, wake them
			so that we get more slots */

			os_aio_simulated_wake_handler_threads();
		}
		
		os_event_wait(array->not_full);

		goto loop;
	}

	for (i = 0;; i++) {
		slot = os_aio_array_get_nth_slot(array, i);

		if (slot->reserved == FALSE) {
			break;
		}
	}

	array->n_reserved++;

3044 3045 3046 3047
	if (array->n_reserved == 1) {
		os_event_reset(array->is_empty);
	}

3048 3049 3050 3051 3052
	if (array->n_reserved == array->n_slots) {
		os_event_reset(array->not_full);
	}
	
	slot->reserved = TRUE;
unknown's avatar
unknown committed
3053
	slot->reservation_time = time(NULL);
3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068
	slot->message1 = message1;
	slot->message2 = message2;
	slot->file     = file;
	slot->name     = name;
	slot->len      = len;
	slot->type     = type;
	slot->buf      = buf;
	slot->offset   = offset;
	slot->offset_high = offset_high;
	slot->io_already_done = FALSE;
	
#ifdef WIN_ASYNC_IO		
	control = &(slot->control);
	control->Offset = (DWORD)offset;
	control->OffsetHigh = (DWORD)offset_high;
3069
	os_event_reset(slot->event);
3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088

#elif defined(POSIX_ASYNC_IO)

#if (UNIV_WORD_SIZE == 8)
	offset = offset + (offset_high << 32);
#else
	ut_a(offset_high == 0);
#endif 
	control = &(slot->control);
	control->aio_fildes = file;
	control->aio_buf = buf;
	control->aio_nbytes = len;
	control->aio_offset = offset;
	control->aio_reqprio = 0;
	control->aio_sigevent.sigev_notify = SIGEV_SIGNAL;
	control->aio_sigevent.sigev_signo =
			SIGRTMIN + 1 + os_aio_get_array_no(array);
			/* TODO: How to choose the signal numbers? */
/*
3089 3090
	fprintf(stderr, "AIO signal number %lu\n",
		(ulint) control->aio_sigevent.sigev_signo);
3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122
*/
	control->aio_sigevent.sigev_value.sival_ptr = slot;
#endif
	os_mutex_exit(array->mutex);

	return(slot);
}

/***********************************************************************
Frees a slot in the aio array. */
static
void
os_aio_array_free_slot(
/*===================*/
	os_aio_array_t*	array,	/* in: aio array */
	os_aio_slot_t*	slot)	/* in: pointer to slot */
{
	ut_ad(array);
	ut_ad(slot);

	os_mutex_enter(array->mutex);

	ut_ad(slot->reserved);
	
	slot->reserved = FALSE;

	array->n_reserved--;

	if (array->n_reserved == array->n_slots - 1) {
		os_event_set(array->not_full);
	}

3123 3124 3125 3126
	if (array->n_reserved == 0) {
		os_event_set(array->is_empty);
	}

3127
#ifdef WIN_ASYNC_IO		
3128
	os_event_reset(slot->event);
3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143
#endif
	os_mutex_exit(array->mutex);
}

/**************************************************************************
Wakes up a simulated aio i/o-handler thread if it has something to do. */
static
void
os_aio_simulated_wake_handler_thread(
/*=================================*/
	ulint	global_segment)	/* in: the number of the segment in the aio
				arrays */
{
	os_aio_array_t*	array;
	os_aio_slot_t*	slot;
unknown's avatar
Merge  
unknown committed
3144
	ulint		segment;
3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187
	ulint		n;
	ulint		i;

	ut_ad(!os_aio_use_native_aio);

	segment = os_aio_get_array_and_local_segment(&array, global_segment);

	n = array->n_slots / array->n_segments;

	/* Look through n slots after the segment * n'th slot */

	os_mutex_enter(array->mutex);

	for (i = 0; i < n; i++) {
		slot = os_aio_array_get_nth_slot(array, i + segment * n);

		if (slot->reserved) {
			/* Found an i/o request */
			
			break;
		}
	}

	os_mutex_exit(array->mutex);

	if (i < n) {
		os_event_set(os_aio_segment_wait_events[global_segment]);
	}
}

/**************************************************************************
Wakes up simulated aio i/o-handler threads if they have something to do. */

void
os_aio_simulated_wake_handler_threads(void)
/*=======================================*/
{
	ulint	i;

	if (os_aio_use_native_aio) {
		/* We do not use simulated aio: do nothing */

		return;
unknown's avatar
unknown committed
3188 3189 3190
	}	

	os_aio_recommend_sleep_for_read_threads	= FALSE;
3191 3192 3193 3194 3195 3196

	for (i = 0; i < os_aio_n_segments; i++) {
		os_aio_simulated_wake_handler_thread(i);
	}
}

unknown's avatar
unknown committed
3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221
/**************************************************************************
This function can be called if one wants to post a batch of reads and
prefers an i/o-handler thread to handle them all at once later. You must
call os_aio_simulated_wake_handler_threads later to ensure the threads
are not left sleeping! */

void
os_aio_simulated_put_read_threads_to_sleep(void)
/*============================================*/
{
	os_aio_array_t*	array;
	ulint		g;

	os_aio_recommend_sleep_for_read_threads	= TRUE;

	for (g = 0; g < os_aio_n_segments; g++) {
		os_aio_get_array_and_local_segment(&array, g);

		if (array == os_aio_read_array) {
		
			os_event_reset(os_aio_segment_wait_events[g]);
		}
	}
}

3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243
/***********************************************************************
Requests an asynchronous i/o operation. */

ibool
os_aio(
/*===*/
				/* out: TRUE if request was queued
				successfully, FALSE if fail */
	ulint		type,	/* in: OS_FILE_READ or OS_FILE_WRITE */
	ulint		mode,	/* in: OS_AIO_NORMAL, ..., possibly ORed
				to OS_AIO_SIMULATED_WAKE_LATER: the
				last flag advises this function not to wake
				i/o-handler threads, but the caller will
				do the waking explicitly later, in this
				way the caller can post several requests in
				a batch; NOTE that the batch must not be
				so big that it exhausts the slots in aio
				arrays! NOTE that a simulated batch
				may introduce hidden chances of deadlocks,
				because i/os are not actually handled until
				all have been posted: use with great
				caution! */
3244
	const char*	name,	/* in: name of the file or path as a
3245 3246 3247 3248 3249 3250 3251 3252
				null-terminated string */
	os_file_t	file,	/* in: handle to a file */
	void*		buf,	/* in: buffer where to read or from which
				to write */
	ulint		offset,	/* in: least significant 32 bits of file
				offset where to read or write */
	ulint		offset_high, /* in: most significant 32 bits of
				offset */
unknown's avatar
unknown committed
3253
	ulint		n,	/* in: number of bytes to read or write */
3254 3255 3256 3257 3258 3259 3260 3261 3262
	void*		message1,/* in: messages for the aio handler (these
				can be used to identify a completed aio
				operation); if mode is OS_AIO_SYNC, these
				are ignored */
	void*		message2)
{
	os_aio_array_t*	array;
	os_aio_slot_t*	slot;
#ifdef WIN_ASYNC_IO
unknown's avatar
unknown committed
3263
	ibool		retval;
3264
	BOOL		ret		= TRUE;
3265
	DWORD		len		= (DWORD) n;
3266 3267
	void*		dummy_mess1;
	void*		dummy_mess2;
3268
	ulint		dummy_type;
3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296
#endif
	ulint		err		= 0;
	ibool		retry;
	ulint		wake_later;

	ut_ad(file);
	ut_ad(buf);
	ut_ad(n > 0);
	ut_ad(n % OS_FILE_LOG_BLOCK_SIZE == 0);
	ut_ad(offset % OS_FILE_LOG_BLOCK_SIZE == 0);
	ut_ad(os_aio_validate());

	wake_later = mode & OS_AIO_SIMULATED_WAKE_LATER;
	mode = mode & (~OS_AIO_SIMULATED_WAKE_LATER);
	
	if (mode == OS_AIO_SYNC
#ifdef WIN_ASYNC_IO
				&& !os_aio_use_native_aio
#endif
	) {
		/* This is actually an ordinary synchronous read or write:
		no need to use an i/o-handler thread. NOTE that if we use
		Windows async i/o, Windows does not allow us to use
		ordinary synchronous os_file_read etc. on the same file,
		therefore we have built a special mechanism for synchronous
		wait in the Windows case. */

		if (type == OS_FILE_READ) {
3297 3298
			return(os_file_read(file, buf, offset,
							offset_high, n));
3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314
		}

		ut_a(type == OS_FILE_WRITE);

		return(os_file_write(name, file, buf, offset, offset_high, n));
	}

try_again:
	if (mode == OS_AIO_NORMAL) {
		if (type == OS_FILE_READ) {
			array = os_aio_read_array;
		} else {
			array = os_aio_write_array;
		}
	} else if (mode == OS_AIO_IBUF) {
		ut_ad(type == OS_FILE_READ);
3315 3316 3317 3318
		/* Reduce probability of deadlock bugs in connection with ibuf:
		do not let the ibuf i/o handler sleep */

		wake_later = FALSE;
3319 3320 3321 3322 3323 3324 3325 3326

		array = os_aio_ibuf_array;
	} else if (mode == OS_AIO_LOG) {

		array = os_aio_log_array;
	} else if (mode == OS_AIO_SYNC) {
		array = os_aio_sync_array;
	} else {
3327
		array = NULL; /* Eliminate compiler warning */
3328 3329 3330 3331 3332 3333 3334 3335
		ut_error;
	}
	
	slot = os_aio_array_reserve_slot(type, array, message1, message2, file,
					name, buf, offset, offset_high, n);
	if (type == OS_FILE_READ) {
		if (os_aio_use_native_aio) {
#ifdef WIN_ASYNC_IO
3336
			os_n_file_reads++;
unknown's avatar
unknown committed
3337 3338
			os_bytes_read_since_printout += len;
			
3339 3340 3341 3342 3343
			ret = ReadFile(file, buf, (DWORD)n, &len,
							&(slot->control));
#elif defined(POSIX_ASYNC_IO)
			slot->control.aio_lio_opcode = LIO_READ;
			err = (ulint) aio_read(&(slot->control));
3344
			fprintf(stderr, "Starting POSIX aio read %lu\n", err);
3345 3346 3347 3348 3349 3350 3351 3352 3353 3354
#endif
		} else {
			if (!wake_later) {
				os_aio_simulated_wake_handler_thread(
				 os_aio_get_segment_no_from_slot(array, slot));
			}
		}
	} else if (type == OS_FILE_WRITE) {
		if (os_aio_use_native_aio) {
#ifdef WIN_ASYNC_IO
3355
			os_n_file_writes++;
3356 3357 3358 3359 3360
			ret = WriteFile(file, buf, (DWORD)n, &len,
							&(slot->control));
#elif defined(POSIX_ASYNC_IO)
			slot->control.aio_lio_opcode = LIO_WRITE;
			err = (ulint) aio_write(&(slot->control));
3361
			fprintf(stderr, "Starting POSIX aio write %lu\n", err);
3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375
#endif
		} else {
			if (!wake_later) {
				os_aio_simulated_wake_handler_thread(
				 os_aio_get_segment_no_from_slot(array, slot));
			}
		}
	} else {
		ut_error;
	}

#ifdef WIN_ASYNC_IO
	if (os_aio_use_native_aio) {
		if ((ret && len == n)
3376
		    || (!ret && GetLastError() == ERROR_IO_PENDING)) {
3377 3378 3379 3380 3381 3382 3383
			/* aio was queued successfully! */
		
	    		if (mode == OS_AIO_SYNC) {
	    		    /* We want a synchronous i/o operation on a file
	    		    where we also use async i/o: in Windows we must
	    		    use the same wait mechanism as for async i/o */
	    		
unknown's avatar
unknown committed
3384
	    		    retval = os_aio_windows_handle(ULINT_UNDEFINED,
3385 3386
					slot->pos,
		    			&dummy_mess1, &dummy_mess2,
unknown's avatar
unknown committed
3387 3388 3389
					&dummy_type);

			    return(retval);
3390 3391 3392 3393 3394
	    		}

			return(TRUE);
		}

3395
		err = 1; /* Fall through the next if */
3396 3397 3398 3399 3400 3401 3402 3403 3404 3405
	}
#endif
	if (err == 0) {
		/* aio was queued successfully! */

		return(TRUE);
	}

	os_aio_array_free_slot(array, slot);

3406
	retry = os_file_handle_error(name,
unknown's avatar
unknown committed
3407
			type == OS_FILE_READ ? "aio read" : "aio write");
3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443
	if (retry) {

		goto try_again;
	}	

	return(FALSE);
}

#ifdef WIN_ASYNC_IO
/**************************************************************************
This function is only used in Windows asynchronous i/o.
Waits for an aio operation to complete. This function is used to wait the
for completed requests. The aio array of pending requests is divided
into segments. The thread specifies which segment or slot it wants to wait
for. NOTE: this function will also take care of freeing the aio slot,
therefore no other thread is allowed to do the freeing! */

ibool
os_aio_windows_handle(
/*==================*/
				/* out: TRUE if the aio operation succeeded */
	ulint	segment,	/* in: the number of the segment in the aio
				arrays to wait for; segment 0 is the ibuf
				i/o thread, segment 1 the log i/o thread,
				then follow the non-ibuf read threads, and as
				the last are the non-ibuf write threads; if
				this is ULINT_UNDEFINED, then it means that
				sync aio is used, and this parameter is
				ignored */
	ulint	pos,		/* this parameter is used only in sync aio:
				wait for the aio slot at this position */  
	void**	message1,	/* out: the messages passed with the aio
				request; note that also in the case where
				the aio operation failed, these output
				parameters are valid and can be used to
				restart the operation, for example */
3444 3445
	void**	message2,
	ulint*	type)		/* out: OS_FILE_WRITE or ..._READ */
3446
{
3447
	ulint		orig_seg	= segment;
3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471
	os_aio_array_t*	array;
	os_aio_slot_t*	slot;
	ulint		n;
	ulint		i;
	ibool		ret_val;
	BOOL		ret;
	DWORD		len;

	if (segment == ULINT_UNDEFINED) {
		array = os_aio_sync_array;
		segment = 0;
	} else {
		segment = os_aio_get_array_and_local_segment(&array, segment);
	}
	
	/* NOTE! We only access constant fields in os_aio_array. Therefore
	we do not have to acquire the protecting mutex yet */

	ut_ad(os_aio_validate());
	ut_ad(segment < array->n_segments);

	n = array->n_slots / array->n_segments;

	if (array == os_aio_sync_array) {
3472
		os_event_wait(os_aio_array_get_nth_slot(array, pos)->event);
3473 3474
		i = pos;
	} else {
3475
		srv_set_io_thread_op_info(orig_seg, "wait Windows aio");
3476 3477
		i = os_event_wait_multiple(n,
				(array->native_events) + segment * n);
3478 3479 3480 3481 3482 3483 3484 3485
	}

	os_mutex_enter(array->mutex);

	slot = os_aio_array_get_nth_slot(array, i + segment * n);

	ut_a(slot->reserved);

unknown's avatar
unknown committed
3486
	if (orig_seg != ULINT_UNDEFINED) {
3487 3488
		srv_set_io_thread_op_info(orig_seg,
					"get windows aio return value");
unknown's avatar
unknown committed
3489 3490
	}

3491 3492 3493 3494 3495
	ret = GetOverlappedResult(slot->file, &(slot->control), &len, TRUE);

	*message1 = slot->message1;
	*message2 = slot->message2;

3496 3497
	*type = slot->type;

3498 3499
	if (ret && len == slot->len) {
		ret_val = TRUE;
3500

unknown's avatar
unknown committed
3501 3502
		if (slot->type == OS_FILE_WRITE
				&& !os_do_not_call_flush_at_each_write) {
3503 3504
		         ut_a(TRUE == os_file_flush(slot->file));
		}
3505
	} else {
3506
		os_file_handle_error(slot->name, "Windows aio");
unknown's avatar
unknown committed
3507
		
3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556
		ret_val = FALSE;
	}		  

	os_mutex_exit(array->mutex);

	os_aio_array_free_slot(array, slot);
	
	return(ret_val);
}
#endif

#ifdef POSIX_ASYNC_IO

/**************************************************************************
This function is only used in Posix asynchronous i/o. Waits for an aio
operation to complete. */

ibool
os_aio_posix_handle(
/*================*/
				/* out: TRUE if the aio operation succeeded */
	ulint	array_no,	/* in: array number 0 - 3 */
	void**	message1,	/* out: the messages passed with the aio
				request; note that also in the case where
				the aio operation failed, these output
				parameters are valid and can be used to
				restart the operation, for example */
	void**	message2)
{
	os_aio_array_t*	array;
	os_aio_slot_t*	slot;
	siginfo_t	info;
	sigset_t	sigset;
	sigset_t        proc_sigset;
	sigset_t        thr_sigset;
	int		ret;
	int             i;
	int             sig;
	
        sigemptyset(&sigset);
	sigaddset(&sigset, SIGRTMIN + 1 + array_no);

	pthread_sigmask(SIG_UNBLOCK, &sigset, NULL);

	/*
	sigprocmask(0, NULL, &proc_sigset);
	pthread_sigmask(0, NULL, &thr_sigset);

	for (i = 32 ; i < 40; i++) {
3557
		fprintf(stderr, "%lu : %lu %lu\n", (ulint)i,
3558 3559 3560 3561 3562 3563 3564 3565 3566
		 (ulint)sigismember(&proc_sigset, i),
		 (ulint)sigismember(&thr_sigset, i));
	}
	*/

	ret = sigwaitinfo(&sigset, &info);

	if (sig != SIGRTMIN + 1 + array_no) {

3567
		ut_error;
3568 3569 3570 3571
	
		return(FALSE);
	}
	
3572
	fputs("Handling POSIX aio\n", stderr);
3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584

	array = os_aio_get_array_from_no(array_no);

	os_mutex_enter(array->mutex);

	slot = info.si_value.sival_ptr;

	ut_a(slot->reserved);

	*message1 = slot->message1;
	*message2 = slot->message2;

unknown's avatar
unknown committed
3585 3586
	if (slot->type == OS_FILE_WRITE
				&& !os_do_not_call_flush_at_each_write) {
3587 3588 3589
		ut_a(TRUE == os_file_flush(slot->file));
	}

3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615
	os_mutex_exit(array->mutex);

	os_aio_array_free_slot(array, slot);
	
	return(TRUE);
}
#endif

/**************************************************************************
Does simulated aio. This function should be called by an i/o-handler
thread. */

ibool
os_aio_simulated_handle(
/*====================*/
				/* out: TRUE if the aio operation succeeded */
	ulint	global_segment,	/* in: the number of the segment in the aio
				arrays to wait for; segment 0 is the ibuf
				i/o thread, segment 1 the log i/o thread,
				then follow the non-ibuf read threads, and as
				the last are the non-ibuf write threads */
	void**	message1,	/* out: the messages passed with the aio
				request; note that also in the case where
				the aio operation failed, these output
				parameters are valid and can be used to
				restart the operation, for example */
3616 3617
	void**	message2,
	ulint*	type)		/* out: OS_FILE_WRITE or ..._READ */
3618 3619 3620 3621 3622 3623 3624 3625 3626 3627
{
	os_aio_array_t*	array;
	ulint		segment;
	os_aio_slot_t*	slot;
	os_aio_slot_t*	slot2;
	os_aio_slot_t*	consecutive_ios[OS_AIO_MERGE_N_CONSECUTIVE];
	ulint		n_consecutive;
	ulint		total_len;
	ulint		offs;
	ulint		lowest_offset;
unknown's avatar
unknown committed
3628 3629
	ulint		biggest_age;
	ulint		age;
3630
	byte*		combined_buf;
unknown's avatar
unknown committed
3631
	byte*		combined_buf2;
3632 3633 3634
	ibool		ret;
	ulint		n;
	ulint		i;
unknown's avatar
unknown committed
3635
	ulint		len2;
unknown's avatar
unknown committed
3636
	
3637 3638 3639 3640 3641 3642
	segment = os_aio_get_array_and_local_segment(&array, global_segment);
	
restart:
	/* NOTE! We only access constant fields in os_aio_array. Therefore
	we do not have to acquire the protecting mutex yet */

unknown's avatar
unknown committed
3643 3644
	srv_set_io_thread_op_info(global_segment,
					"looking for i/o requests (a)");
3645 3646 3647 3648 3649 3650 3651
	ut_ad(os_aio_validate());
	ut_ad(segment < array->n_segments);

	n = array->n_slots / array->n_segments;

	/* Look through n slots after the segment * n'th slot */

unknown's avatar
unknown committed
3652 3653 3654 3655 3656 3657 3658 3659 3660
	if (array == os_aio_read_array
	    && os_aio_recommend_sleep_for_read_threads) {

		/* Give other threads chance to add several i/os to the array
		at once. */

		goto recommended_sleep;
	}
	
3661 3662
	os_mutex_enter(array->mutex);

unknown's avatar
unknown committed
3663 3664 3665
	srv_set_io_thread_op_info(global_segment,
					"looking for i/o requests (b)");

3666 3667 3668 3669 3670 3671 3672 3673
	/* Check if there is a slot for which the i/o has already been
	done */
	
	for (i = 0; i < n; i++) {
		slot = os_aio_array_get_nth_slot(array, i + segment * n);

		if (slot->reserved && slot->io_already_done) {

unknown's avatar
unknown committed
3674 3675
			if (os_aio_print_debug) {
				fprintf(stderr,
3676
"InnoDB: i/o for slot %lu already done, returning\n", (ulong) i);
unknown's avatar
unknown committed
3677 3678
			}

3679 3680 3681 3682 3683 3684 3685 3686
			ret = TRUE;
			
			goto slot_io_done;
		}
	}

	n_consecutive = 0;

unknown's avatar
unknown committed
3687 3688 3689
	/* If there are at least 2 seconds old requests, then pick the oldest
	one to prevent starvation. If several requests have the same age,
	then pick the one at the lowest offset. */
3690

unknown's avatar
unknown committed
3691
	biggest_age = 0;
3692
	lowest_offset = ULINT_MAX;
unknown's avatar
unknown committed
3693

3694 3695 3696
	for (i = 0; i < n; i++) {
		slot = os_aio_array_get_nth_slot(array, i + segment * n);

unknown's avatar
unknown committed
3697 3698 3699
		if (slot->reserved) {
		        age = (ulint)difftime(time(NULL),
						slot->reservation_time);
3700

unknown's avatar
unknown committed
3701 3702 3703
			if ((age >= 2 && age > biggest_age)
			    || (age >= 2 && age == biggest_age
			        && slot->offset < lowest_offset)) {
3704

unknown's avatar
unknown committed
3705 3706
			        /* Found an i/o request */
				consecutive_ios[0] = slot;
3707

unknown's avatar
unknown committed
3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725
				n_consecutive = 1;

				biggest_age = age;
				lowest_offset = slot->offset;
			}
		}
	}

	if (n_consecutive == 0) {
	        /* There were no old requests. Look for an i/o request at the
		lowest offset in the array (we ignore the high 32 bits of the
		offset in these heuristics) */

		lowest_offset = ULINT_MAX;
	
		for (i = 0; i < n; i++) {
		        slot = os_aio_array_get_nth_slot(array,
							i + segment * n);
3726

unknown's avatar
unknown committed
3727
			if (slot->reserved && slot->offset < lowest_offset) {
3728

unknown's avatar
unknown committed
3729 3730 3731 3732 3733 3734 3735
			        /* Found an i/o request */
				consecutive_ios[0] = slot;

				n_consecutive = 1;

				lowest_offset = slot->offset;
			}
3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777
		}
	}

	if (n_consecutive == 0) {

		/* No i/o requested at the moment */

		goto wait_for_io;
	}

	slot = consecutive_ios[0];

	/* Check if there are several consecutive blocks to read or write */

consecutive_loop:	
	for (i = 0; i < n; i++) {
		slot2 = os_aio_array_get_nth_slot(array, i + segment * n);

		if (slot2->reserved && slot2 != slot
		    && slot2->offset == slot->offset + slot->len
		    && slot->offset + slot->len > slot->offset /* check that
						sum does not wrap over */
		    && slot2->offset_high == slot->offset_high
		    && slot2->type == slot->type
		    && slot2->file == slot->file) {

			/* Found a consecutive i/o request */

			consecutive_ios[n_consecutive] = slot2;
			n_consecutive++;

			slot = slot2;

			if (n_consecutive < OS_AIO_MERGE_N_CONSECUTIVE) {
			
				goto consecutive_loop;
			} else {
				break;
			}
		}
	}

unknown's avatar
unknown committed
3778 3779
	srv_set_io_thread_op_info(global_segment, "consecutive i/o requests");

3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793
	/* We have now collected n_consecutive i/o requests in the array;
	allocate a single buffer which can hold all data, and perform the
	i/o */

	total_len = 0;
	slot = consecutive_ios[0];
	
	for (i = 0; i < n_consecutive; i++) {
		total_len += consecutive_ios[i]->len;
	}

	if (n_consecutive == 1) {
		/* We can use the buffer of the i/o request */
		combined_buf = slot->buf;
3794
		combined_buf2 = NULL;
3795
	} else {
unknown's avatar
unknown committed
3796
		combined_buf2 = ut_malloc(total_len + UNIV_PAGE_SIZE);
3797

unknown's avatar
unknown committed
3798 3799 3800
		ut_a(combined_buf2);

		combined_buf = ut_align(combined_buf2, UNIV_PAGE_SIZE);
3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819
	}
	
	/* We release the array mutex for the time of the i/o: NOTE that
	this assumes that there is just one i/o-handler thread serving
	a single segment of slots! */

	os_mutex_exit(array->mutex);

	if (slot->type == OS_FILE_WRITE && n_consecutive > 1) {
		/* Copy the buffers to the combined buffer */
		offs = 0;
		
		for (i = 0; i < n_consecutive; i++) {

			ut_memcpy(combined_buf + offs, consecutive_ios[i]->buf,
						consecutive_ios[i]->len);
			offs += consecutive_ios[i]->len;
		}
	}
unknown's avatar
unknown committed
3820
	
3821
	srv_set_io_thread_op_info(global_segment, "doing file i/o");
3822

unknown's avatar
unknown committed
3823 3824 3825
	if (os_aio_print_debug) {
		fprintf(stderr,
"InnoDB: doing i/o of type %lu at offset %lu %lu, length %lu\n",
3826 3827
			(ulong) slot->type, (ulong) slot->offset_high,
			(ulong) slot->offset, (ulong) total_len);
unknown's avatar
unknown committed
3828 3829
	}

3830 3831
	/* Do the i/o with ordinary, synchronous i/o functions: */
	if (slot->type == OS_FILE_WRITE) {
unknown's avatar
unknown committed
3832
		if (array == os_aio_write_array) {
unknown's avatar
unknown committed
3833 3834
			if ((total_len % UNIV_PAGE_SIZE != 0)
			    || (slot->offset % UNIV_PAGE_SIZE != 0)) {
unknown's avatar
unknown committed
3835 3836
				fprintf(stderr,
"InnoDB: Error: trying a displaced write to %s %lu %lu, len %lu\n",
3837 3838 3839
					slot->name, (ulong) slot->offset_high,
					(ulong) slot->offset,
					(ulong) total_len);
3840
				ut_error;
unknown's avatar
unknown committed
3841 3842
			}
			  
unknown's avatar
unknown committed
3843 3844 3845 3846 3847 3848 3849 3850 3851 3852
			/* Do a 'last millisecond' check that the page end
			is sensible; reported page checksum errors from
			Linux seem to wipe over the page end */

			for (len2 = 0; len2 + UNIV_PAGE_SIZE <= total_len;
						len2 += UNIV_PAGE_SIZE) {
				if (mach_read_from_4(combined_buf + len2
						+ FIL_PAGE_LSN + 4)
				    != mach_read_from_4(combined_buf + len2
				    		+ UNIV_PAGE_SIZE
unknown's avatar
unknown committed
3853
				    	- FIL_PAGE_END_LSN_OLD_CHKSUM + 4)) {
unknown's avatar
unknown committed
3854 3855 3856
				    	ut_print_timestamp(stderr);
				    	fprintf(stderr,
"  InnoDB: ERROR: The page to be written seems corrupt!\n");
unknown's avatar
unknown committed
3857 3858 3859
				    	fprintf(stderr,
"InnoDB: Writing a block of %lu bytes, currently writing at offset %lu\n",
					(ulong)total_len, (ulong)len2);
unknown's avatar
unknown committed
3860
					buf_page_print(combined_buf + len2);
unknown's avatar
unknown committed
3861 3862 3863 3864 3865 3866
				    	fprintf(stderr,
"InnoDB: ERROR: The page to be written seems corrupt!\n");
				}
			}
		}
	
3867 3868 3869 3870 3871 3872 3873 3874
		ret = os_file_write(slot->name, slot->file, combined_buf,
				slot->offset, slot->offset_high, total_len);
	} else {
		ret = os_file_read(slot->file, combined_buf,
				slot->offset, slot->offset_high, total_len);
	}

	ut_a(ret);
3875
	srv_set_io_thread_op_info(global_segment, "file i/o done");
3876

3877 3878 3879
/* fprintf(stderr,
	"aio: %lu consecutive %lu:th segment, first offs %lu blocks\n",
	n_consecutive, global_segment, slot->offset / UNIV_PAGE_SIZE); */
3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892

	if (slot->type == OS_FILE_READ && n_consecutive > 1) {
		/* Copy the combined buffer to individual buffers */
		offs = 0;
		
		for (i = 0; i < n_consecutive; i++) {

			ut_memcpy(consecutive_ios[i]->buf, combined_buf + offs, 
						consecutive_ios[i]->len);
			offs += consecutive_ios[i]->len;
		}
	}

3893
	if (combined_buf2) {
unknown's avatar
unknown committed
3894
		ut_free(combined_buf2);
3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915
	}

	os_mutex_enter(array->mutex);

	/* Mark the i/os done in slots */

	for (i = 0; i < n_consecutive; i++) {
		consecutive_ios[i]->io_already_done = TRUE;
	}

	/* We return the messages for the first slot now, and if there were
	several slots, the messages will be returned with subsequent calls
	of this function */
	
slot_io_done:

	ut_a(slot->reserved);

	*message1 = slot->message1;
	*message2 = slot->message2;

3916 3917
	*type = slot->type;

3918 3919 3920 3921 3922 3923 3924
	os_mutex_exit(array->mutex);

	os_aio_array_free_slot(array, slot);
	
	return(ret);

wait_for_io:
unknown's avatar
unknown committed
3925 3926
	srv_set_io_thread_op_info(global_segment, "resetting wait event");

3927 3928 3929 3930 3931 3932 3933
	/* We wait here until there again can be i/os in the segment
	of this thread */
	
	os_event_reset(os_aio_segment_wait_events[global_segment]);

	os_mutex_exit(array->mutex);

unknown's avatar
unknown committed
3934
recommended_sleep:
3935
	srv_set_io_thread_op_info(global_segment, "waiting for i/o request");
3936

3937 3938
	os_event_wait(os_aio_segment_wait_events[global_segment]);

unknown's avatar
unknown committed
3939 3940 3941
	if (os_aio_print_debug) {
		fprintf(stderr,
"InnoDB: i/o handler thread for i/o segment %lu wakes up\n",
3942
			(ulong) global_segment);
unknown's avatar
unknown committed
3943 3944
	}
	
3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004
	goto restart;
}

/**************************************************************************
Validates the consistency of an aio array. */
static
ibool
os_aio_array_validate(
/*==================*/
				/* out: TRUE if ok */
	os_aio_array_t*	array)	/* in: aio wait array */
{
	os_aio_slot_t*	slot;
	ulint		n_reserved	= 0;
	ulint		i;
	
	ut_a(array);

	os_mutex_enter(array->mutex);

	ut_a(array->n_slots > 0);
	ut_a(array->n_segments > 0);
	
	for (i = 0; i < array->n_slots; i++) {
		slot = os_aio_array_get_nth_slot(array, i);
	
		if (slot->reserved) {
			n_reserved++;
			ut_a(slot->len > 0);
		}
	}

	ut_a(array->n_reserved == n_reserved);

	os_mutex_exit(array->mutex);

	return(TRUE);
}

/**************************************************************************
Validates the consistency the aio system. */

ibool
os_aio_validate(void)
/*=================*/
				/* out: TRUE if ok */
{
	os_aio_array_validate(os_aio_read_array);
	os_aio_array_validate(os_aio_write_array);
	os_aio_array_validate(os_aio_ibuf_array);
	os_aio_array_validate(os_aio_log_array);
	os_aio_array_validate(os_aio_sync_array);

	return(TRUE);
}

/**************************************************************************
Prints info of the aio arrays. */

void
unknown's avatar
unknown committed
4005 4006
os_aio_print(
/*=========*/
4007
	FILE*	file)	/* in: file where to print */
4008 4009 4010 4011
{
	os_aio_array_t*	array;
	os_aio_slot_t*	slot;
	ulint		n_reserved;
4012 4013
	time_t		current_time;
	double		time_elapsed;
unknown's avatar
unknown committed
4014
	double		avg_bytes_read;
4015
	ulint		i;
4016

4017
	for (i = 0; i < srv_n_file_io_threads; i++) {
unknown's avatar
unknown committed
4018
		fprintf(file, "I/O thread %lu state: %s (%s)", (ulong) i,
unknown's avatar
unknown committed
4019 4020
					srv_io_thread_op_info[i],
					srv_io_thread_function[i]);
unknown's avatar
unknown committed
4021

unknown's avatar
unknown committed
4022
#ifndef __WIN__
unknown's avatar
unknown committed
4023 4024 4025
        	if (os_aio_segment_wait_events[i]->is_set) {
			fprintf(file, " ev set");
		}
unknown's avatar
unknown committed
4026
#endif
unknown's avatar
unknown committed
4027 4028
			
		fprintf(file, "\n");
4029 4030
	}

4031
	fputs("Pending normal aio reads:", file);
4032

4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048
	array = os_aio_read_array;
loop:
	ut_a(array);
	
	os_mutex_enter(array->mutex);

	ut_a(array->n_slots > 0);
	ut_a(array->n_segments > 0);
	
	n_reserved = 0;

	for (i = 0; i < array->n_slots; i++) {
		slot = os_aio_array_get_nth_slot(array, i);
	
		if (slot->reserved) {
			n_reserved++;
4049 4050 4051
			/* fprintf(stderr, "Reserved slot, messages %p %p\n",
				slot->message1, slot->message2); */
			ut_a(slot->len > 0);
4052 4053 4054 4055 4056
		}
	}

	ut_a(array->n_reserved == n_reserved);

unknown's avatar
unknown committed
4057
	fprintf(file, " %lu", (ulong) n_reserved);
4058 4059 4060 4061
	
	os_mutex_exit(array->mutex);

	if (array == os_aio_read_array) {
4062
		fputs(", aio writes:", file);
4063
	
4064 4065 4066 4067 4068 4069
		array = os_aio_write_array;

		goto loop;
	}

	if (array == os_aio_write_array) {
4070
		fputs(",\n ibuf aio reads:", file);
4071 4072 4073 4074 4075 4076
		array = os_aio_ibuf_array;

		goto loop;
	}

	if (array == os_aio_ibuf_array) {
4077
		fputs(", log i/o's:", file);
4078 4079 4080 4081 4082 4083
		array = os_aio_log_array;

		goto loop;
	}

	if (array == os_aio_log_array) {
4084
		fputs(", sync i/o's:", file);
4085 4086 4087 4088
		array = os_aio_sync_array;

		goto loop;
	}
4089

4090
	putc('\n', file);
4091
	current_time = time(NULL);
unknown's avatar
unknown committed
4092
	time_elapsed = 0.001 + difftime(current_time, os_last_printout);
4093

4094 4095
	fprintf(file,
		"Pending flushes (fsync) log: %lu; buffer pool: %lu\n"
unknown's avatar
unknown committed
4096
		"%lu OS file reads, %lu OS file writes, %lu OS fsyncs\n",
unknown's avatar
unknown committed
4097 4098
		(ulong) fil_n_pending_log_flushes,
		(ulong) fil_n_pending_tablespace_flushes,
4099 4100
		(ulong) os_n_file_reads, (ulong) os_n_file_writes,
		(ulong) os_n_fsyncs);
unknown's avatar
unknown committed
4101

unknown's avatar
unknown committed
4102
	if (os_file_n_pending_preads != 0 || os_file_n_pending_pwrites != 0) {
4103
		fprintf(file,
unknown's avatar
unknown committed
4104
		    "%lu pending preads, %lu pending pwrites\n",
4105 4106
		    (ulong) os_file_n_pending_preads,
		    (ulong) os_file_n_pending_pwrites);
unknown's avatar
unknown committed
4107 4108
	}

unknown's avatar
unknown committed
4109 4110 4111
	if (os_n_file_reads == os_n_file_reads_old) {
		avg_bytes_read = 0.0;
	} else {
4112
		avg_bytes_read = (double) os_bytes_read_since_printout /
unknown's avatar
unknown committed
4113 4114 4115
				(os_n_file_reads - os_n_file_reads_old);
	}

4116
	fprintf(file,
unknown's avatar
unknown committed
4117
"%.2f reads/s, %lu avg bytes/read, %.2f writes/s, %.2f fsyncs/s\n",
4118 4119
		(os_n_file_reads - os_n_file_reads_old)
		/ time_elapsed,
4120
		(ulong)avg_bytes_read,
4121 4122 4123 4124 4125 4126 4127 4128
		(os_n_file_writes - os_n_file_writes_old)
		/ time_elapsed,
		(os_n_fsyncs - os_n_fsyncs_old)
		/ time_elapsed);

	os_n_file_reads_old = os_n_file_reads;
	os_n_file_writes_old = os_n_file_writes;
	os_n_fsyncs_old = os_n_fsyncs;
unknown's avatar
unknown committed
4129
	os_bytes_read_since_printout = 0;
4130 4131
	
	os_last_printout = current_time;
4132 4133
}

unknown's avatar
unknown committed
4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148
/**************************************************************************
Refreshes the statistics used to print per-second averages. */

void
os_aio_refresh_stats(void)
/*======================*/
{
	os_n_file_reads_old = os_n_file_reads;
	os_n_file_writes_old = os_n_file_writes;
	os_n_fsyncs_old = os_n_fsyncs;
	os_bytes_read_since_printout = 0;
	
	os_last_printout = time(NULL);
}

4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159 4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207
/**************************************************************************
Checks that all slots in the system have been freed, that is, there are
no pending io operations. */

ibool
os_aio_all_slots_free(void)
/*=======================*/
				/* out: TRUE if all free */
{
	os_aio_array_t*	array;
	ulint		n_res	= 0;
	
	array = os_aio_read_array;

	os_mutex_enter(array->mutex);

	n_res += array->n_reserved; 
	
	os_mutex_exit(array->mutex);

	array = os_aio_write_array;

	os_mutex_enter(array->mutex);

	n_res += array->n_reserved; 
	
	os_mutex_exit(array->mutex);

	array = os_aio_ibuf_array;

	os_mutex_enter(array->mutex);

	n_res += array->n_reserved; 
	
	os_mutex_exit(array->mutex);

	array = os_aio_log_array;

	os_mutex_enter(array->mutex);

	n_res += array->n_reserved; 
	
	os_mutex_exit(array->mutex);

	array = os_aio_sync_array;

	os_mutex_enter(array->mutex);

	n_res += array->n_reserved; 
	
	os_mutex_exit(array->mutex);

	if (n_res == 0) {

		return(TRUE);
	}

	return(FALSE);
}