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Annotation of nono/host/ffs_dinode.h, revision 1.1

1.1     ! root        1: /*     $NetBSD: dinode.h,v 1.25 2016/01/22 23:06:10 dholland Exp $     */
        !             2: 
        !             3: /*
        !             4:  * Copyright (c) 2002 Networks Associates Technology, Inc.
        !             5:  * All rights reserved.
        !             6:  *
        !             7:  * This software was developed for the FreeBSD Project by Marshall
        !             8:  * Kirk McKusick and Network Associates Laboratories, the Security
        !             9:  * Research Division of Network Associates, Inc. under DARPA/SPAWAR
        !            10:  * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
        !            11:  * research program
        !            12:  *
        !            13:  * Copyright (c) 1982, 1989, 1993
        !            14:  *     The Regents of the University of California.  All rights reserved.
        !            15:  * (c) UNIX System Laboratories, Inc.
        !            16:  * All or some portions of this file are derived from material licensed
        !            17:  * to the University of California by American Telephone and Telegraph
        !            18:  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
        !            19:  * the permission of UNIX System Laboratories, Inc.
        !            20:  *
        !            21:  * Redistribution and use in source and binary forms, with or without
        !            22:  * modification, are permitted provided that the following conditions
        !            23:  * are met:
        !            24:  * 1. Redistributions of source code must retain the above copyright
        !            25:  *    notice, this list of conditions and the following disclaimer.
        !            26:  * 2. Redistributions in binary form must reproduce the above copyright
        !            27:  *    notice, this list of conditions and the following disclaimer in the
        !            28:  *    documentation and/or other materials provided with the distribution.
        !            29:  * 3. Neither the name of the University nor the names of its contributors
        !            30:  *    may be used to endorse or promote products derived from this software
        !            31:  *    without specific prior written permission.
        !            32:  *
        !            33:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            34:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            35:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            36:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            37:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            38:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            39:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            40:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            41:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            42:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            43:  * SUCH DAMAGE.
        !            44:  *
        !            45:  *     @(#)dinode.h    8.9 (Berkeley) 3/29/95
        !            46:  */
        !            47: 
        !            48: /*
        !            49:  * NOTE: COORDINATE ON-DISK FORMAT CHANGES WITH THE FREEBSD PROJECT.
        !            50:  */
        !            51: 
        !            52: #ifndef        _UFS_UFS_DINODE_H_
        !            53: #define        _UFS_UFS_DINODE_H_
        !            54: 
        !            55: /*
        !            56:  * The root inode is the root of the file system.  Inode 0 can't be used for
        !            57:  * normal purposes and historically bad blocks were linked to inode 1, thus
        !            58:  * the root inode is 2.  (Inode 1 is no longer used for this purpose, however
        !            59:  * numerous dump tapes make this assumption, so we are stuck with it).
        !            60:  */
        !            61: #define        UFS_ROOTINO     ((ino_t)2)
        !            62: 
        !            63: /*
        !            64:  * The Whiteout inode# is a dummy non-zero inode number which will
        !            65:  * never be allocated to a real file.  It is used as a place holder
        !            66:  * in the directory entry which has been tagged as a DT_W entry.
        !            67:  * See the comments about UFS_ROOTINO above.
        !            68:  */
        !            69: #define        UFS_WINO        ((ino_t)1)
        !            70: 
        !            71: /*
        !            72:  * A dinode contains all the meta-data associated with a UFS file.
        !            73:  * This structure defines the on-disk format of a dinode. Since
        !            74:  * this structure describes an on-disk structure, all its fields
        !            75:  * are defined by types with precise widths.
        !            76:  */
        !            77: 
        !            78: #define UFS_NXADDR     2
        !            79: #define        UFS_NDADDR      12              /* Direct addresses in inode. */
        !            80: #define        UFS_NIADDR      3               /* Indirect addresses in inode. */
        !            81: 
        !            82: struct ufs1_dinode {
        !            83:        uint16_t        di_mode;        /*   0: IFMT, permissions; see below. */
        !            84:        int16_t         di_nlink;       /*   2: File link count. */
        !            85:        uint16_t        di_oldids[2];   /*   4: Ffs: old user and group ids. */
        !            86:        uint64_t        di_size;        /*   8: File byte count. */
        !            87:        int32_t         di_atime;       /*  16: Last access time. */
        !            88:        int32_t         di_atimensec;   /*  20: Last access time. */
        !            89:        int32_t         di_mtime;       /*  24: Last modified time. */
        !            90:        int32_t         di_mtimensec;   /*  28: Last modified time. */
        !            91:        int32_t         di_ctime;       /*  32: Last inode change time. */
        !            92:        int32_t         di_ctimensec;   /*  36: Last inode change time. */
        !            93:        int32_t         di_db[UFS_NDADDR]; /*  40: Direct disk blocks. */
        !            94:        int32_t         di_ib[UFS_NIADDR]; /*  88: Indirect disk blocks. */
        !            95:        uint32_t        di_flags;       /* 100: Status flags (chflags). */
        !            96:        uint32_t        di_blocks;      /* 104: Blocks actually held. */
        !            97:        int32_t         di_gen;         /* 108: Generation number. */
        !            98:        uint32_t        di_uid;         /* 112: File owner. */
        !            99:        uint32_t        di_gid;         /* 116: File group. */
        !           100:        uint64_t        di_modrev;      /* 120: i_modrev for NFSv4 */
        !           101: };
        !           102: 
        !           103: struct ufs2_dinode {
        !           104:        uint16_t        di_mode;        /*   0: IFMT, permissions; see below. */
        !           105:        int16_t         di_nlink;       /*   2: File link count. */
        !           106:        uint32_t        di_uid;         /*   4: File owner. */
        !           107:        uint32_t        di_gid;         /*   8: File group. */
        !           108:        uint32_t        di_blksize;     /*  12: Inode blocksize. */
        !           109:        uint64_t        di_size;        /*  16: File byte count. */
        !           110:        uint64_t        di_blocks;      /*  24: Bytes actually held. */
        !           111:        int64_t         di_atime;       /*  32: Last access time. */
        !           112:        int64_t         di_mtime;       /*  40: Last modified time. */
        !           113:        int64_t         di_ctime;       /*  48: Last inode change time. */
        !           114:        int64_t         di_birthtime;   /*  56: Inode creation time. */
        !           115:        int32_t         di_mtimensec;   /*  64: Last modified time. */
        !           116:        int32_t         di_atimensec;   /*  68: Last access time. */
        !           117:        int32_t         di_ctimensec;   /*  72: Last inode change time. */
        !           118:        int32_t         di_birthnsec;   /*  76: Inode creation time. */
        !           119:        int32_t         di_gen;         /*  80: Generation number. */
        !           120:        uint32_t        di_kernflags;   /*  84: Kernel flags. */
        !           121:        uint32_t        di_flags;       /*  88: Status flags (chflags). */
        !           122:        int32_t         di_extsize;     /*  92: External attributes block. */
        !           123:        int64_t         di_extb[UFS_NXADDR];/* 96: External attributes block. */
        !           124:        int64_t         di_db[UFS_NDADDR]; /* 112: Direct disk blocks. */
        !           125:        int64_t         di_ib[UFS_NIADDR]; /* 208: Indirect disk blocks. */
        !           126:        uint64_t        di_modrev;      /* 232: i_modrev for NFSv4 */
        !           127:        int64_t         di_spare[2];    /* 240: Reserved; currently unused */
        !           128: };
        !           129: 
        !           130: /*
        !           131:  * The di_db fields may be overlaid with other information for
        !           132:  * file types that do not have associated disk storage. Block
        !           133:  * and character devices overlay the first data block with their
        !           134:  * dev_t value. Short symbolic links place their path in the
        !           135:  * di_db area.
        !           136:  */
        !           137: #define        di_ogid         di_oldids[1]
        !           138: #define        di_ouid         di_oldids[0]
        !           139: #define        di_rdev         di_db[0]
        !           140: #define UFS1_MAXSYMLINKLEN     ((UFS_NDADDR + UFS_NIADDR) * sizeof(int32_t))
        !           141: #define UFS2_MAXSYMLINKLEN     ((UFS_NDADDR + UFS_NIADDR) * sizeof(int64_t))
        !           142: 
        !           143: #define UFS_MAXSYMLINKLEN(ip) \
        !           144:        ((ip)->i_ump->um_fstype == UFS1) ? \
        !           145:        UFS1_MAXSYMLINKLEN : UFS2_MAXSYMLINKLEN
        !           146: 
        !           147: /* NeXT used to keep short symlinks in the inode even when using
        !           148:  * FS_42INODEFMT.  In that case fs->fs_maxsymlinklen is probably -1,
        !           149:  * but short symlinks were stored in inodes shorter than this:
        !           150:  */
        !           151: #define        APPLEUFS_MAXSYMLINKLEN 60
        !           152: 
        !           153: /* File permissions. */
        !           154: #define        IEXEC           0000100         /* Executable. */
        !           155: #define        IWRITE          0000200         /* Writable. */
        !           156: #define        IREAD           0000400         /* Readable. */
        !           157: #define        ISVTX           0001000         /* Sticky bit. */
        !           158: #define        ISGID           0002000         /* Set-gid. */
        !           159: #define        ISUID           0004000         /* Set-uid. */
        !           160: 
        !           161: /* File types. */
        !           162: #define        IFMT            0170000         /* Mask of file type. */
        !           163: #define        IFIFO           0010000         /* Named pipe (fifo). */
        !           164: #define        IFCHR           0020000         /* Character device. */
        !           165: #define        IFDIR           0040000         /* Directory file. */
        !           166: #define        IFBLK           0060000         /* Block device. */
        !           167: #define        IFREG           0100000         /* Regular file. */
        !           168: #define        IFLNK           0120000         /* Symbolic link. */
        !           169: #define        IFSOCK          0140000         /* UNIX domain socket. */
        !           170: #define        IFWHT           0160000         /* Whiteout. */
        !           171: 
        !           172: /* Size of the on-disk inode. */
        !           173: #define        DINODE1_SIZE    (sizeof(struct ufs1_dinode))            /* 128 */
        !           174: #define        DINODE2_SIZE    (sizeof(struct ufs2_dinode))
        !           175: 
        !           176: #endif /* !_UFS_UFS_DINODE_H_ */

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