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

     /*-
      * Copyright (c) 1982, 1989, 1993
      *      The Regents of the University of California.  All rights reserved.
      * (c) UNIX System Laboratories, Inc.
      * All or some portions of this file are derived from material licensed
      * to the University of California by American Telephone and Telegraph
      * Co. or Unix System Laboratories, Inc. and are reproduced herein with
      * the permission of UNIX System Laboratories, Inc.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. 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.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 THE REGENTS 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.
     *
     *      @(#)inode.h     8.9 (Berkeley) 5/14/95
     * $FreeBSD: releng/9.0/sys/fs/ext2fs/inode.h 221166 2011-04-28 14:27:17Z jhb $
     */
    
    #ifndef _FS_EXT2FS_INODE_H_
    #define _FS_EXT2FS_INODE_H_
    
    #include <sys/lock.h>
    #include <sys/queue.h>
    
    #define NDADDR  12                      /* Direct addresses in inode. */
    #define NIADDR  3                       /* Indirect addresses in inode. */
    
    /*
     * This must agree with the definition in <ufs/ufs/dir.h>.
     */
    #define doff_t          int32_t
    
    /*
     * The inode is used to describe each active (or recently active) file in the
     * EXT2FS filesystem. It is composed of two types of information. The first
     * part is the information that is needed only while the file is active (such
     * as the identity of the file and linkage to speed its lookup). The second
     * part is the permanent meta-data associated with the file which is read in
     * from the permanent dinode from long term storage when the file becomes
     * active, and is put back when the file is no longer being used.
     */
    struct inode {
            struct  vnode  *i_vnode;/* Vnode associated with this inode. */
            struct  ext2mount *i_ump;
            uint32_t i_flag;        /* flags, see below */
            ino_t     i_number;     /* The identity of the inode. */
    
            struct  m_ext2fs *i_e2fs;       /* EXT2FS */
            u_quad_t i_modrev;      /* Revision level for NFS lease. */
            /*
             * Side effects; used during directory lookup.
             */
            int32_t  i_count;       /* Size of free slot in directory. */
            doff_t   i_endoff;      /* End of useful stuff in directory. */
            doff_t   i_diroff;      /* Offset in dir, where we found last entry. */
            doff_t   i_offset;      /* Offset of free space in directory. */
    
            uint32_t i_block_group;
            uint32_t i_next_alloc_block;
            uint32_t i_next_alloc_goal;
            uint32_t i_prealloc_block;
            uint32_t i_prealloc_count;
    
            /* Fields from struct dinode in UFS. */
            uint16_t        i_mode;         /* IFMT, permissions; see below. */
            int16_t         i_nlink;        /* File link count. */
            uint64_t        i_size;         /* File byte count. */
            int32_t         i_atime;        /* Last access time. */
            int32_t         i_atimensec;    /* Last access time. */
            int32_t         i_mtime;        /* Last modified time. */
            int32_t         i_mtimensec;    /* Last modified time. */
            int32_t         i_ctime;        /* Last inode change time. */
            int32_t         i_ctimensec;    /* Last inode change time. */
            int32_t         i_db[NDADDR];   /* Direct disk blocks. */
            int32_t         i_ib[NIADDR];   /* Indirect disk blocks. */
            uint32_t        i_flags;        /* Status flags (chflags). */
            int32_t         i_blocks;       /* Blocks actually held. */
            int32_t         i_gen;          /* Generation number. */
            uint32_t        i_uid;          /* File owner. */
            uint32_t        i_gid;          /* File group. */
   };
   
   /*
    * The di_db fields may be overlaid with other information for
    * file types that do not have associated disk storage. Block
    * and character devices overlay the first data block with their
    * dev_t value. Short symbolic links place their path in the
    * di_db area.
    */
   #define i_shortlink     i_db
   #define i_rdev          i_db[0]
   #define MAXSYMLINKLEN   ((NDADDR + NIADDR) * sizeof(int32_t))
   
   /* File permissions. */
   #define IEXEC           0000100         /* Executable. */
   #define IWRITE          0000200         /* Writeable. */
   #define IREAD           0000400         /* Readable. */
   #define ISVTX           0001000         /* Sticky bit. */
   #define ISGID           0002000         /* Set-gid. */
   #define ISUID           0004000         /* Set-uid. */
   
   /* File types. */
   #define IFMT            0170000         /* Mask of file type. */
   #define IFIFO           0010000         /* Named pipe (fifo). */
   #define IFCHR           0020000         /* Character device. */
   #define IFDIR           0040000         /* Directory file. */
   #define IFBLK           0060000         /* Block device. */
   #define IFREG           0100000         /* Regular file. */
   #define IFLNK           0120000         /* Symbolic link. */
   #define IFSOCK          0140000         /* UNIX domain socket. */
   #define IFWHT           0160000         /* Whiteout. */
   
   /* These flags are kept in i_flag. */
   #define IN_ACCESS       0x0001          /* Access time update request. */
   #define IN_CHANGE       0x0002          /* Inode change time update request. */
   #define IN_UPDATE       0x0004          /* Modification time update request. */
   #define IN_MODIFIED     0x0008          /* Inode has been modified. */
   #define IN_RENAME       0x0010          /* Inode is being renamed. */
   #define IN_HASHED       0x0020          /* Inode is on hash list */
   #define IN_LAZYMOD      0x0040          /* Modified, but don't write yet. */
   #define IN_SPACECOUNTED 0x0080          /* Blocks to be freed in free count. */
   #define IN_LAZYACCESS   0x0100          /* Process IN_ACCESS after the
                                               suspension finished */
   
   #define i_devvp i_ump->um_devvp
   
   #ifdef _KERNEL
   /*
    * Structure used to pass around logical block paths generated by
    * ext2_getlbns and used by truncate and bmap code.
    */
   struct indir {
           int32_t in_lbn;                 /* Logical block number. */
           int     in_off;                 /* Offset in buffer. */
           int     in_exists;              /* Flag if the block exists. */
   };
   
   /* Convert between inode pointers and vnode pointers. */
   #define VTOI(vp)        ((struct inode *)(vp)->v_data)
   #define ITOV(ip)        ((ip)->i_vnode)
   
   /* Check whether the MNTK_ASYNC flag has been set for a mount point */
   #define DOINGASYNC(vp)          ((vp)->v_mount->mnt_kern_flag & MNTK_ASYNC)
   
   /* This overlays the fid structure (see mount.h). */
   struct ufid {
           uint16_t ufid_len;      /* Length of structure. */
           uint16_t ufid_pad;      /* Force 32-bit alignment. */
           ino_t    ufid_ino;      /* File number (ino). */
           int32_t  ufid_gen;      /* Generation number. */
   };
   #endif /* _KERNEL */
   
   #endif /* !_FS_EXT2FS_INODE_H_ */

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