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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1982, 1989, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  * (c) UNIX System Laboratories, Inc.
    7  * All or some portions of this file are derived from material licensed
    8  * to the University of California by American Telephone and Telegraph
    9  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   10  * the permission of UNIX System Laboratories, Inc.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      @(#)inode.h     8.9 (Berkeley) 5/14/95
   37  * $FreeBSD: releng/12.0/sys/fs/ext2fs/inode.h 331095 2018-03-17 12:59:55Z emaste $
   38  */
   39 
   40 #ifndef _FS_EXT2FS_INODE_H_
   41 #define _FS_EXT2FS_INODE_H_
   42 
   43 #include <sys/param.h>
   44 #include <sys/lock.h>
   45 #include <sys/mutex.h>
   46 #include <sys/queue.h>
   47 
   48 #include <fs/ext2fs/ext2_extents.h>
   49 
   50 /*
   51  * This must agree with the definition in <ufs/ufs/dir.h>.
   52  */
   53 #define doff_t          int32_t
   54 
   55 #define EXT2_NDADDR     12              /* Direct addresses in inode. */
   56 #define EXT2_NIADDR     3               /* Indirect addresses in inode. */
   57 
   58 /*
   59  * The size of physical and logical block numbers in EXT2FS.
   60  */
   61 typedef uint32_t e2fs_daddr_t;
   62 typedef int64_t e2fs_lbn_t;
   63 typedef int64_t e4fs_daddr_t;
   64 
   65 /*
   66  * The inode is used to describe each active (or recently active) file in the
   67  * EXT2FS filesystem. It is composed of two types of information. The first
   68  * part is the information that is needed only while the file is active (such
   69  * as the identity of the file and linkage to speed its lookup). The second
   70  * part is the permanent meta-data associated with the file which is read in
   71  * from the permanent dinode from long term storage when the file becomes
   72  * active, and is put back when the file is no longer being used.
   73  */
   74 struct inode {
   75         struct  vnode  *i_vnode;/* Vnode associated with this inode. */
   76         struct  ext2mount *i_ump;
   77         uint32_t i_flag;        /* flags, see below */
   78         ino_t     i_number;     /* The identity of the inode. */
   79 
   80         struct  m_ext2fs *i_e2fs;       /* EXT2FS */
   81         u_quad_t i_modrev;      /* Revision level for NFS lease. */
   82         /*
   83          * Side effects; used during directory lookup.
   84          */
   85         int32_t  i_count;       /* Size of free slot in directory. */
   86         doff_t   i_endoff;      /* End of useful stuff in directory. */
   87         doff_t   i_diroff;      /* Offset in dir, where we found last entry. */
   88         doff_t   i_offset;      /* Offset of free space in directory. */
   89 
   90         uint32_t i_block_group;
   91         uint32_t i_next_alloc_block;
   92         uint32_t i_next_alloc_goal;
   93 
   94         /* Fields from struct dinode in UFS. */
   95         uint16_t        i_mode;         /* IFMT, permissions; see below. */
   96         int32_t         i_nlink;        /* File link count. */
   97         uint32_t        i_uid;          /* File owner. */
   98         uint32_t        i_gid;          /* File group. */
   99         uint64_t        i_size;         /* File byte count. */
  100         uint64_t        i_blocks;       /* Blocks actually held. */
  101         int32_t         i_atime;        /* Last access time. */
  102         int32_t         i_mtime;        /* Last modified time. */
  103         int32_t         i_ctime;        /* Last inode change time. */
  104         int32_t         i_birthtime;    /* Inode creation time. */
  105         int32_t         i_mtimensec;    /* Last modified time. */
  106         int32_t         i_atimensec;    /* Last access time. */
  107         int32_t         i_ctimensec;    /* Last inode change time. */
  108         int32_t         i_birthnsec;    /* Inode creation time. */
  109         uint32_t        i_gen;          /* Generation number. */
  110         uint64_t        i_facl;         /* EA block number. */
  111         uint32_t        i_flags;        /* Status flags (chflags). */
  112         union {
  113                 struct {
  114                         uint32_t i_db[EXT2_NDADDR]; /* Direct disk blocks. */
  115                         uint32_t i_ib[EXT2_NIADDR]; /* Indirect disk blocks. */
  116                 };
  117                 uint32_t i_data[EXT2_NDADDR + EXT2_NIADDR];
  118         };
  119 
  120         struct ext4_extent_cache i_ext_cache; /* cache for ext4 extent */
  121 };
  122 
  123 /*
  124  * The di_db fields may be overlaid with other information for
  125  * file types that do not have associated disk storage. Block
  126  * and character devices overlay the first data block with their
  127  * dev_t value. Short symbolic links place their path in the
  128  * di_db area.
  129  */
  130 #define i_shortlink     i_db
  131 #define i_rdev          i_db[0]
  132 
  133 /* File permissions. */
  134 #define IEXEC           0000100         /* Executable. */
  135 #define IWRITE          0000200         /* Writeable. */
  136 #define IREAD           0000400         /* Readable. */
  137 #define ISVTX           0001000         /* Sticky bit. */
  138 #define ISGID           0002000         /* Set-gid. */
  139 #define ISUID           0004000         /* Set-uid. */
  140 
  141 /* File types. */
  142 #define IFMT            0170000         /* Mask of file type. */
  143 #define IFIFO           0010000         /* Named pipe (fifo). */
  144 #define IFCHR           0020000         /* Character device. */
  145 #define IFDIR           0040000         /* Directory file. */
  146 #define IFBLK           0060000         /* Block device. */
  147 #define IFREG           0100000         /* Regular file. */
  148 #define IFLNK           0120000         /* Symbolic link. */
  149 #define IFSOCK          0140000         /* UNIX domain socket. */
  150 #define IFWHT           0160000         /* Whiteout. */
  151 
  152 /* These flags are kept in i_flag. */
  153 #define IN_ACCESS       0x0001          /* Access time update request. */
  154 #define IN_CHANGE       0x0002          /* Inode change time update request. */
  155 #define IN_UPDATE       0x0004          /* Modification time update request. */
  156 #define IN_MODIFIED     0x0008          /* Inode has been modified. */
  157 #define IN_RENAME       0x0010          /* Inode is being renamed. */
  158 #define IN_HASHED       0x0020          /* Inode is on hash list */
  159 #define IN_LAZYMOD      0x0040          /* Modified, but don't write yet. */
  160 #define IN_SPACECOUNTED 0x0080          /* Blocks to be freed in free count. */
  161 #define IN_LAZYACCESS   0x0100          /* Process IN_ACCESS after the
  162                                             suspension finished */
  163 
  164 /*
  165  * These are translation flags for some attributes that Ext4
  166  * passes as inode flags but that we cannot pass directly.
  167  */
  168 #define IN_E3INDEX      0x010000
  169 #define IN_E4EXTENTS    0x020000
  170 
  171 #define i_devvp i_ump->um_devvp
  172 
  173 #ifdef _KERNEL
  174 /*
  175  * Structure used to pass around logical block paths generated by
  176  * ext2_getlbns and used by truncate and bmap code.
  177  */
  178 struct indir {
  179         e2fs_lbn_t in_lbn;              /* Logical block number. */
  180         int     in_off;                 /* Offset in buffer. */
  181 };
  182 
  183 /* Convert between inode pointers and vnode pointers. */
  184 #define VTOI(vp)        ((struct inode *)(vp)->v_data)
  185 #define ITOV(ip)        ((ip)->i_vnode)
  186 
  187 /* This overlays the fid structure (see mount.h). */
  188 struct ufid {
  189         uint16_t ufid_len;              /* Length of structure. */
  190         uint16_t ufid_pad;              /* Force 32-bit alignment. */
  191         ino_t   ufid_ino;               /* File number (ino). */
  192         uint32_t ufid_gen;              /* Generation number. */
  193 };
  194 #endif  /* _KERNEL */
  195 
  196 #endif  /* !_FS_EXT2FS_INODE_H_ */

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