os0file.h

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/******************************************************
The interface to the operating system file io

(c) 1995 Innobase Oy

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

#ifndef os0file_h
#define os0file_h

#include "univ.i"

#ifndef __WIN__
#include <dirent.h>
#include <sys/stat.h>
#include <time.h>
#endif

typedef	struct fil_node_struct	fil_node_t;

#ifdef UNIV_DO_FLUSH
extern ibool	os_do_not_call_flush_at_each_write;
#endif /* UNIV_DO_FLUSH */
extern ibool	os_has_said_disk_full;
extern ibool	os_aio_print_debug;

extern ulint	os_file_n_pending_preads;
extern ulint	os_file_n_pending_pwrites;

extern ulint    os_n_pending_reads;
extern ulint    os_n_pending_writes;

#ifdef __WIN__

/* We define always WIN_ASYNC_IO, and check at run-time whether
   the OS actually supports it: Win 95 does not, NT does. */
#define WIN_ASYNC_IO

#define UNIV_NON_BUFFERED_IO

#endif

#ifdef __WIN__
#define os_file_t	HANDLE
#else
typedef int	os_file_t;
#endif

extern ulint	os_innodb_umask;

/* 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 */

extern ibool	os_aio_use_native_aio;

#define OS_FILE_SECTOR_SIZE		512

/* The next value should be smaller or equal to the smallest sector size used
on any disk. A log block is required to be a portion of disk which is written
so that if the start and the end of a block get written to disk, then the
whole block gets written. This should be true even in most cases of a crash:
if this fails for a log block, then it is equivalent to a media failure in the
log. */

#define OS_FILE_LOG_BLOCK_SIZE		512

/* Options for file_create */
#define	OS_FILE_OPEN			51
#define	OS_FILE_CREATE			52
#define OS_FILE_OVERWRITE		53
#define OS_FILE_OPEN_RAW		54
#define	OS_FILE_CREATE_PATH		55
#define	OS_FILE_OPEN_RETRY		56	/* for os_file_create() on
						the first ibdata file */

#define OS_FILE_READ_ONLY 		333
#define	OS_FILE_READ_WRITE		444
#define	OS_FILE_READ_ALLOW_DELETE	555	/* for ibbackup */

/* Options for file_create */
#define	OS_FILE_AIO			61
#define	OS_FILE_NORMAL			62

/* Types for file create */
#define	OS_DATA_FILE			100
#define OS_LOG_FILE			101

/* Error codes from os_file_get_last_error */
#define	OS_FILE_NOT_FOUND		71
#define	OS_FILE_DISK_FULL		72
#define	OS_FILE_ALREADY_EXISTS		73
#define	OS_FILE_PATH_ERROR		74
#define	OS_FILE_AIO_RESOURCES_RESERVED	75	/* wait for OS aio resources
						to become available again */
#define	OS_FILE_ERROR_NOT_SPECIFIED	76

/* Types for aio operations */
#define OS_FILE_READ	10
#define OS_FILE_WRITE	11

#define OS_FILE_LOG	256	/* This can be ORed to type */

#define OS_AIO_N_PENDING_IOS_PER_THREAD 32	/* Win NT does not allow more
						than 64 */

/* Modes for aio operations */
#define OS_AIO_NORMAL	21	/* Normal asynchronous i/o not for ibuf
				pages or ibuf bitmap pages */
#define OS_AIO_IBUF	22	/* Asynchronous i/o for ibuf pages or ibuf
				bitmap pages */
#define OS_AIO_LOG  	23	/* Asynchronous i/o for the log */
#define OS_AIO_SYNC	24	/* Asynchronous i/o where the calling thread
				will itself wait for the i/o to complete,
				doing also the job of the i/o-handler thread;
				can be used for any pages, ibuf or non-ibuf.
				This is used to save CPU time, as we can do
				with fewer thread switches. Plain synchronous
				i/o is not as good, because it must serialize
				the file seek and read or write, causing a
				bottleneck for parallelism. */

#define OS_AIO_SIMULATED_WAKE_LATER	512 /* This can be ORed to mode
				in the call of os_aio(...),
				if the caller wants to post several i/o
				requests in a batch, and only after that
 				wake the i/o-handler thread; this has
				effect only in simulated aio */ 
#define OS_WIN31     1
#define OS_WIN95     2	
#define OS_WINNT     3
#define OS_WIN2000   4

extern ulint	os_n_file_reads;
extern ulint	os_n_file_writes;
extern ulint	os_n_fsyncs;

/* File types for directory entry data type */

enum os_file_type_enum{
    OS_FILE_TYPE_UNKNOWN = 0,
    OS_FILE_TYPE_FILE,	 		/* regular file */
    OS_FILE_TYPE_DIR,			/* directory */
    OS_FILE_TYPE_LINK 			/* symbolic link */
};
typedef enum os_file_type_enum	  os_file_type_t;

/* Maximum path string length in bytes when referring to tables with in the
'./databasename/tablename.ibd' path format; we can allocate at least 2 buffers
of this size from the thread stack; that is why this should not be made much
bigger than 4000 bytes */
#define OS_FILE_MAX_PATH	4000

/* Struct used in fetching information of a file in a directory */
struct os_file_stat_struct{
	char		name[OS_FILE_MAX_PATH];	/* path to a file */
	os_file_type_t	type;			/* file type */
	ib_longlong	size;			/* file size */
	time_t          ctime;			/* creation time */
	time_t		mtime;			/* modification time */
	time_t		atime;			/* access time */
};
typedef struct os_file_stat_struct	os_file_stat_t;

#ifdef __WIN__
typedef HANDLE  os_file_dir_t;	/* directory stream */
#else
typedef DIR*	os_file_dir_t;	/* directory stream */
#endif

/***************************************************************************
Gets the operating system version. Currently works only on Windows. */

ulint
os_get_os_version(void);
/*===================*/
                  /* out: OS_WIN95, OS_WIN31, OS_WINNT, or OS_WIN2000 */
/********************************************************************
Creates the seek mutexes used in positioned reads and writes. */

void
os_io_init_simple(void);
/*===================*/
/***************************************************************************
Creates a temporary file. */

FILE*
os_file_create_tmpfile(void);
/*========================*/
			/* out: temporary file handle, or NULL on error */
/***************************************************************************
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(
/*============*/
					/* 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 */
/***************************************************************************
Closes a directory stream. */

int
os_file_closedir(
/*=============*/
				/* out: 0 if success, -1 if failure */
	os_file_dir_t	dir);	/* in: directory stream */
/***************************************************************************
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 */
	const char*	dirname,/* in: directory name or path */
	os_file_dir_t	dir,	/* in: directory stream */
	os_file_stat_t*	info);	/* in/out: buffer where the info is returned */
/*********************************************************************
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(
/*=====================*/
					/* 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. */
/********************************************************************
A simple function to open or create a file. */