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/*

 * Copyright (c) 1987,1997, Prentice Hall

 * All rights reserved.

 *

 * Redistribution and use of the MINIX operating system in source and

 * binary forms, with or without modification, are permitted provided

 * that the following conditions are met:

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above

 *   copyright notice, this list of conditions and the following

 *   disclaimer in the documentation and/or other materials provided

 *   with the distribution.

 * - Neither the name of Prentice Hall nor the names of the software

 *   authors or contributors may be used to endorse or promote

 *   products derived from this software without specific prior

 *   written permission.

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS, AUTHORS, AND

 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,

 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL PRENTICE HALL OR ANY AUTHORS OR CONTRIBUTORS BE

 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR

 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE

 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,

 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/** @addtogroup FileSystemImpl

* @{

*/

/**

 * @file    const.h

 * @brief   Constants of all file system. Some of them are not used here in

 *        current version, but will be used in later versions probably.  

 */

#ifndef _CONST_H

#define _CONST_H

#define BLOCK_SIZE      1024    /**< # bytes in a disk block */

#define MAJOR              8    /**< major device = (dev>>MAJOR) & 0377 */

#define MINOR              0    /**< minor device = (dev>>MINOR) & 0377 */

#define BYTE            0377    /**< mask for 8 bits */

#define NO_NUM        0x8000    /**< used as numerical argument to panic() */

/* Not used here. */

#define NR_SEGS            3    /**< # segments per process */

#define T                  0    /**< proc[i].mem_map[T] is for text */

#define D                  1    /**< proc[i].mem_map[D] is for data */

#define S                  2    /**< proc[i].mem_map[S] is for stack */

#define MAX(a, b)   ((a) > (b) ? (a) : (b))

#define MIN(a, b)   ((a) < (b) ? (a) : (b))

#define I_NOT_ALLOC     0000000 /**< this inode is free */

#define I_TYPE          0170000 /**< this field gives inode type */

#define I_REGULAR       0100000 /**< regular file, not dir or special */

#define I_DIRECTORY     0040000 /**< file is a directory */

#define I_BLOCK_SPECIAL 0060000 /**< block special file */

#define I_CHAR_SPECIAL  0020000 /**< character special file */

#define MAX_FILE_POS ((off_t) 037777777777)     /**< largest legal file offset */

#define R_BIT           0000004     /**< Rwx protection bit */

#define W_BIT           0000002     /**< rWx protection bit */

#define X_BIT           0000001     /**< rwX protection bit */

#define NO_BLOCK        ((block_num_t) 0)   /**< absence of a block number */

#define NO_ZONE     ((zone_t) 0)    /**< absence of a zone number */

#define NO_DEV      ((dev_t) 0)     /**< absence of a device numb */

/* Tables sizes. */

#define V1_NR_DZONES       7    /**< # direct zone numbers in a V1 inode */

#define V1_NR_TZONES       9    /**< total # zone numbers in a V1 inode */

#define V2_NR_DZONES       7    /**< # direct zone numbers in a V2 inode */

#define V2_NR_TZONES      10    /**< total # zone numbers in a V2 inode */

#define NR_FILPS         128    /**< # slots in filp table */

#define NR_INODES         64    /**< # slots in "in core" inode table */

/**

* The type of sizeof may be (unsigned) long.  Use the following macro for

* taking the sizes of small objects so that there are no surprises like

* (small) long constants being passed to routines expecting an int.

*/

#define usizeof(t) ((unsigned) sizeof(t))

/* File system macros corresponding with given versions. */

#define SUPER_MAGIC 0x137F  /**< magic number for V1 file systems */

#define SUPER_MAGIC2    0x138F  /**< magic number for V1 file systems - 30 char names */

#define SUPER_V2    0x2468  /**< magic number for V2 file systems */

#define SUPER_V2E   0x2478  /**< magic number for V2 file systems - 30 char names */

#define TOTAL_VERSIONS  2   /**< number of versions of file system */

#define V1      1   /**< version number of V2 file systems */

#define V2      2   /**< version number of V2 file systems */

#define LOOK_UP     0       /**< tells search_dir to lookup string */

#define IS_EMPTY    3       /**< tells search_dir to ret. OK or ENOTEMPTY */  

#define BYTE_SWAP   0   /**< tells conv2/conv4 to swap bytes */

#define DONT_SWAP   1   /**< tells conv2/conv4 not to swap bytes */

#define END_OF_FILE   (-104)    /**< eof detected */

#define ROOT_INODE         1    /**< inode number for root directory */

#define BOOT_BLOCK  ((block_num_t) 0)       /**< block number of boot block */

#define SUPER_BLOCK ((block_num_t) 1)       /**< block number of super block */

/* For normal version. */

#define DIR_ENTRY_SIZE       usizeof (direct_t)  /**< # bytes/dir entry   */

#define NR_DIR_ENTRIES   (BLOCK_SIZE/DIR_ENTRY_SIZE)  /**< # dir entries/blk   */

/* For extended version. */

#define DIR_ENTRY_SIZE_EX   usizeof (directex_t)  /**< # bytes/dir entry   */

#define NR_DIR_ENTRIES_EX   (BLOCK_SIZE/DIR_ENTRY_SIZE_EX)  /**< # dir entries/blk   */

#define SUPER_SIZE      usizeof (super_block_t)       /**< super_block size    */

/* Derived sizes pertaining to the V1 file system. */

#define V1_ZONE_NUM_SIZE           usizeof (zone1_t)  /**< # bytes in V1 zone  */

#define V1_INODE_SIZE             usizeof (d1_inode_t)  /**< bytes in V1 dsk ino */

#define V1_INDIRECTS   (BLOCK_SIZE/V1_ZONE_NUM_SIZE)  /**< # zones/indir block */

#define V1_INODES_PER_BLOCK (BLOCK_SIZE/V1_INODE_SIZE)/**< # V1 dsk inodes/blk */

/* Derived sizes pertaining to the V2 file system. */

#define V2_ZONE_NUM_SIZE            usizeof (zone_t)  /**< # bytes in V2 zone  */

#define V2_INODE_SIZE             usizeof (d2_inode_t)  /**< bytes in V2 dsk ino */

#define V2_INDIRECTS   (BLOCK_SIZE/V2_ZONE_NUM_SIZE)  /**< # zones/indir block */

#define V2_INODES_PER_BLOCK (BLOCK_SIZE/V2_INODE_SIZE)/**< # V2 dsk inodes/blk */

/* Filesystem supported operations. */

#define FS_NEW_CONSUMER (FIRST_USER_METHOD + 50)    /**< this is not file system system call */

#define FS_DROP_CONSUMER (FS_NEW_CONSUMER + 1)      /**< drops connected consument */    

#define FS_BASE     FIRST_USER_METHOD  /**>  Index of the first FS method */

#define FS_NOSYS    (0 + FS_BASE)      /**>   */

#define FS_OPEN     (1 + FS_BASE)      /**>  Open file method */

#define FS_SEEK     (2 + FS_BASE)      /**>  Seek in file method */

#define FS_READ     (3 + FS_BASE)      /**>  File read method */

#define FS_CLOSE    (4 + FS_BASE)      /**>  File close method */

#define FS_CHDIR    (5 + FS_BASE)      /**>  Change current directory method */

#define FS_STAT     (6 + FS_BASE)      /**>  Stat method */

#define FS_FSTAT    (7 + FS_BASE)      /**>  File stat method */

#define FS_DSUM     (8 + FS_BASE)      /**>  Directory entry count method */

#define FS_READENTRY    (9 + FS_BASE)  /**>  Read directory entry method */

#define FS_CALLS    10 /**> The number of File system calls */

#define FS_MIN      (FS_BASE)

#define FS_MAX      (FS_BASE + FS_CALLS)

#define FS_IN_RANGE(VAL)    ((FS_MIN <= VAL && VAL < FS_MAX)? TRUE:FALSE)

#define CON_CONN_ATTEMPTS   1000 /**< Number of attempts the FS will try to connect to the console services. */

#define RD_CONN_ATTEMPTS    1000 /**< Number of attempts the FS will try to connect to the RAM disk services. */

#endif /* _CONST_H */

/**

 * }

 */