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/9.2/sys/fs/ext2fs/inode.h 252234 2013-06-26 04:34:16Z 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 /*
   45  * This must agree with the definition in <ufs/ufs/dir.h>.
   46  */
   47 #define doff_t          int32_t
   48 
   49 #define NDADDR  12                      /* Direct addresses in inode. */
   50 #define NIADDR  3                       /* Indirect addresses in inode. */
   51 
   52 /*
   53  * The size of physical and logical block numbers and time fields in UFS.
   54  */
   55 typedef int32_t e2fs_lbn_t;
   56  
   57 /*
   58  * The inode is used to describe each active (or recently active) file in the
   59  * EXT2FS filesystem. It is composed of two types of information. The first
   60  * part is the information that is needed only while the file is active (such
   61  * as the identity of the file and linkage to speed its lookup). The second
   62  * part is the permanent meta-data associated with the file which is read in
   63  * from the permanent dinode from long term storage when the file becomes
   64  * active, and is put back when the file is no longer being used.
   65  */
   66 struct inode {
   67         struct  vnode  *i_vnode;/* Vnode associated with this inode. */
   68         struct  ext2mount *i_ump;
   69         uint32_t i_flag;        /* flags, see below */
   70         ino_t     i_number;     /* The identity of the inode. */
   71 
   72         struct  m_ext2fs *i_e2fs;       /* EXT2FS */
   73         u_quad_t i_modrev;      /* Revision level for NFS lease. */
   74         /*
   75          * Side effects; used during directory lookup.
   76          */
   77         int32_t  i_count;       /* Size of free slot in directory. */
   78         doff_t   i_endoff;      /* End of useful stuff in directory. */
   79         doff_t   i_diroff;      /* Offset in dir, where we found last entry. */
   80         doff_t   i_offset;      /* Offset of free space in directory. */
   81 
   82         uint32_t i_block_group;
   83         uint32_t i_next_alloc_block;
   84         uint32_t i_next_alloc_goal;
   85 
   86         /* Fields from struct dinode in UFS. */
   87         uint16_t        i_mode;         /* IFMT, permissions; see below. */
   88         int16_t         i_nlink;        /* File link count. */
   89         uint64_t        i_size;         /* File byte count. */
   90         int32_t         i_atime;        /* Last access time. */
   91         int32_t         i_mtime;        /* Last modified time. */
   92         int32_t         i_ctime;        /* Last inode change time. */
   93         int32_t         i_birthtime;    /* Inode creation time. */
   94         int32_t         i_mtimensec;    /* Last modified time. */
   95         int32_t         i_atimensec;    /* Last access time. */
   96         int32_t         i_ctimensec;    /* Last inode change time. */
   97         int32_t         i_birthnsec;    /* Inode creation time. */
   98         uint32_t        i_db[NDADDR];   /* Direct disk blocks. */
   99         uint32_t        i_ib[NIADDR];   /* Indirect disk blocks. */
  100         uint32_t        i_flags;        /* Status flags (chflags). */
  101         uint32_t        i_blocks;       /* Blocks actually held. */
  102         uint32_t        i_gen;          /* Generation number. */
  103         uint32_t        i_uid;          /* File owner. */
  104         uint32_t        i_gid;          /* File group. */
  105 };
  106 
  107 /*
  108  * The di_db fields may be overlaid with other information for
  109  * file types that do not have associated disk storage. Block
  110  * and character devices overlay the first data block with their
  111  * dev_t value. Short symbolic links place their path in the
  112  * di_db area.
  113  */
  114 #define i_shortlink     i_db
  115 #define i_rdev          i_db[0]
  116 
  117 /* File permissions. */
  118 #define IEXEC           0000100         /* Executable. */
  119 #define IWRITE          0000200         /* Writeable. */
  120 #define IREAD           0000400         /* Readable. */
  121 #define ISVTX           0001000         /* Sticky bit. */
  122 #define ISGID           0002000         /* Set-gid. */
  123 #define ISUID           0004000         /* Set-uid. */
  124 
  125 /* File types. */
  126 #define IFMT            0170000         /* Mask of file type. */
  127 #define IFIFO           0010000         /* Named pipe (fifo). */
  128 #define IFCHR           0020000         /* Character device. */
  129 #define IFDIR           0040000         /* Directory file. */
  130 #define IFBLK           0060000         /* Block device. */
  131 #define IFREG           0100000         /* Regular file. */
  132 #define IFLNK           0120000         /* Symbolic link. */
  133 #define IFSOCK          0140000         /* UNIX domain socket. */
  134 #define IFWHT           0160000         /* Whiteout. */
  135 
  136 /* These flags are kept in i_flag. */
  137 #define IN_ACCESS       0x0001          /* Access time update request. */
  138 #define IN_CHANGE       0x0002          /* Inode change time update request. */
  139 #define IN_UPDATE       0x0004          /* Modification time update request. */
  140 #define IN_MODIFIED     0x0008          /* Inode has been modified. */
  141 #define IN_RENAME       0x0010          /* Inode is being renamed. */
  142 #define IN_HASHED       0x0020          /* Inode is on hash list */
  143 #define IN_LAZYMOD      0x0040          /* Modified, but don't write yet. */
  144 #define IN_SPACECOUNTED 0x0080          /* Blocks to be freed in free count. */
  145 #define IN_LAZYACCESS   0x0100          /* Process IN_ACCESS after the
  146                                             suspension finished */
  147 
  148 #define i_devvp i_ump->um_devvp
  149 
  150 #ifdef _KERNEL
  151 /*
  152  * Structure used to pass around logical block paths generated by
  153  * ext2_getlbns and used by truncate and bmap code.
  154  */
  155 struct indir {
  156         e2fs_lbn_t in_lbn;              /* Logical block number. */
  157         int     in_off;                 /* Offset in buffer. */
  158 };
  159 
  160 /* Convert between inode pointers and vnode pointers. */
  161 #define VTOI(vp)        ((struct inode *)(vp)->v_data)
  162 #define ITOV(ip)        ((ip)->i_vnode)
  163 
  164 /* This overlays the fid structure (see mount.h). */
  165 struct ufid {
  166         uint16_t ufid_len;      /* Length of structure. */
  167         uint16_t ufid_pad;      /* Force 32-bit alignment. */
  168         ino_t    ufid_ino;      /* File number (ino). */
  169         uint32_t ufid_gen;      /* Generation number. */
  170 };
  171 #endif /* _KERNEL */
  172 
  173 #endif /* !_FS_EXT2FS_INODE_H_ */

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