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/* 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

/* Defined in ../share/base_const.h */

/*

#define FALSE              0    

#define TRUE           1

#define OK         0

*/

#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 FS_PROC_NR         SERVICE_FS    /* process number of file system */

#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  

#define FS_NOSYS    (0 + FS_BASE)

#define FS_OPEN     (1 + FS_BASE)

#define FS_SEEK     (2 + FS_BASE)

#define FS_READ     (3 + FS_BASE)

#define FS_CLOSE    (4 + FS_BASE)

#define FS_CHDIR    (5 + FS_BASE)

#define FS_STAT     (6 + FS_BASE)

#define FS_FSTAT    (7 + FS_BASE)

#define FS_DSUM     (8 + FS_BASE)

#define FS_READENTRY    (9 + FS_BASE)

#define FS_CALLS    10

#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)

/* Number of attempts the FS will try to connect to each defined services. */

#define CON_CONN_ATTEMPTS   1000

#define RD_CONN_ATTEMPTS    1000

#endif /* _CONST_H */