The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/ext2fs/inode.h

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    1 /*-
    2  * Copyright (c) 1982, 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  * (c) UNIX System Laboratories, Inc.
    5  * All or some portions of this file are derived from material licensed
    6  * to the University of California by American Telephone and Telegraph
    7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
    8  * the permission of UNIX System Laboratories, Inc.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)inode.h     8.9 (Berkeley) 5/14/95
   35  * $FreeBSD: releng/9.1/sys/fs/ext2fs/inode.h 233322 2012-03-22 20:31:52Z pfg $
   36  */
   37 
   38 #ifndef _FS_EXT2FS_INODE_H_
   39 #define _FS_EXT2FS_INODE_H_
   40 
   41 #include <sys/lock.h>
   42 #include <sys/queue.h>
   43 
   44 #define NDADDR  12                      /* Direct addresses in inode. */
   45 #define NIADDR  3                       /* Indirect addresses in inode. */
   46 
   47 /*
   48  * This must agree with the definition in <ufs/ufs/dir.h>.
   49  */
   50 #define doff_t          int32_t
   51 
   52 /*
   53  * The inode is used to describe each active (or recently active) file in the
   54  * EXT2FS filesystem. It is composed of two types of information. The first
   55  * part is the information that is needed only while the file is active (such
   56  * as the identity of the file and linkage to speed its lookup). The second
   57  * part is the permanent meta-data associated with the file which is read in
   58  * from the permanent dinode from long term storage when the file becomes
   59  * active, and is put back when the file is no longer being used.
   60  */
   61 struct inode {
   62         struct  vnode  *i_vnode;/* Vnode associated with this inode. */
   63         struct  ext2mount *i_ump;
   64         uint32_t i_flag;        /* flags, see below */
   65         ino_t     i_number;     /* The identity of the inode. */
   66 
   67         struct  m_ext2fs *i_e2fs;       /* EXT2FS */
   68         u_quad_t i_modrev;      /* Revision level for NFS lease. */
   69         /*
   70          * Side effects; used during directory lookup.
   71          */
   72         int32_t  i_count;       /* Size of free slot in directory. */
   73         doff_t   i_endoff;      /* End of useful stuff in directory. */
   74         doff_t   i_diroff;      /* Offset in dir, where we found last entry. */
   75         doff_t   i_offset;      /* Offset of free space in directory. */
   76 
   77         uint32_t i_block_group;
   78         uint32_t i_next_alloc_block;
   79         uint32_t i_next_alloc_goal;
   80 
   81         /* Fields from struct dinode in UFS. */
   82         uint16_t        i_mode;         /* IFMT, permissions; see below. */
   83         int16_t         i_nlink;        /* File link count. */
   84         uint64_t        i_size;         /* File byte count. */
   85         int32_t         i_atime;        /* Last access time. */
   86         int32_t         i_mtime;        /* Last modified time. */
   87         int32_t         i_ctime;        /* Last inode change time. */
   88         int32_t         i_birthtime;    /* Inode creation time. */
   89         int32_t         i_mtimensec;    /* Last modified time. */
   90         int32_t         i_atimensec;    /* Last access time. */
   91         int32_t         i_ctimensec;    /* Last inode change time. */
   92         int32_t         i_birthnsec;    /* Inode creation time. */
   93         int32_t         i_db[NDADDR];   /* Direct disk blocks. */
   94         int32_t         i_ib[NIADDR];   /* Indirect disk blocks. */
   95         uint32_t        i_flags;        /* Status flags (chflags). */
   96         int32_t         i_blocks;       /* Blocks actually held. */
   97         int32_t         i_gen;          /* Generation number. */
   98         uint32_t        i_uid;          /* File owner. */
   99         uint32_t        i_gid;          /* File group. */
  100 };
  101 
  102 /*
  103  * The di_db fields may be overlaid with other information for
  104  * file types that do not have associated disk storage. Block
  105  * and character devices overlay the first data block with their
  106  * dev_t value. Short symbolic links place their path in the
  107  * di_db area.
  108  */
  109 #define i_shortlink     i_db
  110 #define i_rdev          i_db[0]
  111 #define MAXSYMLINKLEN   ((NDADDR + NIADDR) * sizeof(int32_t))
  112 
  113 /* File permissions. */
  114 #define IEXEC           0000100         /* Executable. */
  115 #define IWRITE          0000200         /* Writeable. */
  116 #define IREAD           0000400         /* Readable. */
  117 #define ISVTX           0001000         /* Sticky bit. */
  118 #define ISGID           0002000         /* Set-gid. */
  119 #define ISUID           0004000         /* Set-uid. */
  120 
  121 /* File types. */
  122 #define IFMT            0170000         /* Mask of file type. */
  123 #define IFIFO           0010000         /* Named pipe (fifo). */
  124 #define IFCHR           0020000         /* Character device. */
  125 #define IFDIR           0040000         /* Directory file. */
  126 #define IFBLK           0060000         /* Block device. */
  127 #define IFREG           0100000         /* Regular file. */
  128 #define IFLNK           0120000         /* Symbolic link. */
  129 #define IFSOCK          0140000         /* UNIX domain socket. */
  130 #define IFWHT           0160000         /* Whiteout. */
  131 
  132 /* These flags are kept in i_flag. */
  133 #define IN_ACCESS       0x0001          /* Access time update request. */
  134 #define IN_CHANGE       0x0002          /* Inode change time update request. */
  135 #define IN_UPDATE       0x0004          /* Modification time update request. */
  136 #define IN_MODIFIED     0x0008          /* Inode has been modified. */
  137 #define IN_RENAME       0x0010          /* Inode is being renamed. */
  138 #define IN_HASHED       0x0020          /* Inode is on hash list */
  139 #define IN_LAZYMOD      0x0040          /* Modified, but don't write yet. */
  140 #define IN_SPACECOUNTED 0x0080          /* Blocks to be freed in free count. */
  141 #define IN_LAZYACCESS   0x0100          /* Process IN_ACCESS after the
  142                                             suspension finished */
  143 
  144 #define i_devvp i_ump->um_devvp
  145 
  146 #ifdef _KERNEL
  147 /*
  148  * Structure used to pass around logical block paths generated by
  149  * ext2_getlbns and used by truncate and bmap code.
  150  */
  151 struct indir {
  152         int32_t in_lbn;                 /* Logical block number. */
  153         int     in_off;                 /* Offset in buffer. */
  154         int     in_exists;              /* Flag if the block exists. */
  155 };
  156 
  157 /* Convert between inode pointers and vnode pointers. */
  158 #define VTOI(vp)        ((struct inode *)(vp)->v_data)
  159 #define ITOV(ip)        ((ip)->i_vnode)
  160 
  161 /* This overlays the fid structure (see mount.h). */
  162 struct ufid {
  163         uint16_t ufid_len;      /* Length of structure. */
  164         uint16_t ufid_pad;      /* Force 32-bit alignment. */
  165         ino_t    ufid_ino;      /* File number (ino). */
  166         int32_t  ufid_gen;      /* Generation number. */
  167 };
  168 #endif /* _KERNEL */
  169 
  170 #endif /* !_FS_EXT2FS_INODE_H_ */

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