os.h

File system using stacked.

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1997-2002
 *	Sleepycat Software.  All rights reserved.
 *
 * $Id: os.h,v 1.1.1.1 2004/08/19 23:53:56 gopalan Exp $
 */

#ifndef _DB_OS_H_
#define	_DB_OS_H_

#if defined(__cplusplus)
extern "C" {
#endif

#ifdef __KERNEL__
# include <linux/fs.h>
#endif

/* DB filehandle. */
struct __fh_t {
#if defined(DB_WIN32)
	HANDLE	  handle;		/* Windows/32 file handle. */
#endif
	fd_t  fd;			/* POSIX file descriptor. */
	char	*name;			/* File name. */

	u_int32_t pagesize;		/* Underlying page size. */

	u_int32_t log_size;		/* XXX: Log file size. */

	u_int32_t pgno;			/* Last seek. */
	u_int32_t pgsize;
	u_int32_t offset;

#define	DB_FH_NOSYNC	0x01		/* Handle doesn't need to be sync'd. */
#define	DB_FH_UNLINK	0x02		/* Unlink on close */
#define	DB_FH_VALID	0x04		/* Handle is valid. */
	u_int8_t flags;
};

/*
 * We group certain seek/write calls into a single function so that we
 * can use pread(2)/pwrite(2) where they're available.
 */
#define	DB_IO_READ	1
#define	DB_IO_WRITE	2
typedef struct __io_t {
	DB_FH	  *fhp;			/* I/O file handle. */
	DB_MUTEX  *mutexp;		/* Mutex to lock. */
	size_t	   pagesize;		/* Page size. */
	db_pgno_t  pgno;		/* Page number. */
	u_int8_t  *buf;			/* Buffer. */
	size_t	   bytes;		/* Bytes read/written. */
} DB_IO;

#if defined(__cplusplus)
}
#endif

#include "dbinc_auto/os_ext.h"
#endif /* !_DB_OS_H_ */