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/ext2_dinode.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2009 Aditya Sarawgi
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD: releng/12.0/sys/fs/ext2fs/ext2_dinode.h 331095 2018-03-17 12:59:55Z emaste $
   29  */
   30 
   31 #ifndef _FS_EXT2FS_EXT2_DINODE_H_
   32 #define _FS_EXT2FS_EXT2_DINODE_H_
   33 
   34 /*
   35  * Special inode numbers
   36  * The root inode is the root of the file system.  Inode 0 can't be used for
   37  * normal purposes and bad blocks are normally linked to inode 1, thus
   38  * the root inode is 2.
   39  * Inode 3 to 10 are reserved in ext2fs.
   40  */
   41 #define EXT2_BADBLKINO          ((ino_t)1)
   42 #define EXT2_ROOTINO            ((ino_t)2)
   43 #define EXT2_ACLIDXINO          ((ino_t)3)
   44 #define EXT2_ACLDATAINO         ((ino_t)4)
   45 #define EXT2_BOOTLOADERINO      ((ino_t)5)
   46 #define EXT2_UNDELDIRINO        ((ino_t)6)
   47 #define EXT2_RESIZEINO          ((ino_t)7)
   48 #define EXT2_JOURNALINO         ((ino_t)8)
   49 #define EXT2_EXCLUDEINO         ((ino_t)9)
   50 #define EXT2_REPLICAINO         ((ino_t)10)
   51 #define EXT2_FIRSTINO           ((ino_t)11)
   52 
   53 /*
   54  * Inode flags
   55  * The system supports EXT2_IMMUTABLE, EXT2_APPEND and EXT2_NODUMP flags.
   56  * The current implementation also uses EXT3_INDEX, EXT4_EXTENTS and
   57  * EXT4_HUGE_FILE with some restrictions imposed by the lack of write
   58  * support.
   59  */
   60 #define EXT2_SECRM              0x00000001      /* Secure deletion */
   61 #define EXT2_UNRM               0x00000002      /* Undelete */
   62 #define EXT2_COMPR              0x00000004      /* Compress file */
   63 #define EXT2_SYNC               0x00000008      /* Synchronous updates */
   64 #define EXT2_IMMUTABLE          0x00000010      /* Immutable file */
   65 #define EXT2_APPEND             0x00000020 /* Writes to file may only append */
   66 #define EXT2_NODUMP             0x00000040      /* Do not dump file */
   67 #define EXT2_NOATIME            0x00000080      /* Do not update atime */
   68 #define EXT3_INDEX              0x00001000      /* Hash-indexed directory */
   69 #define EXT4_IMAGIC             0x00002000      /* AFS directory */
   70 #define EXT4_JOURNAL_DATA       0x00004000 /* File data should be journaled */
   71 #define EXT4_NOTAIL             0x00008000 /* File tail should not be merged */
   72 #define EXT4_DIRSYNC            0x00010000      /* Dirsync behaviour */
   73 #define EXT4_TOPDIR             0x00020000 /* Top of directory hierarchies*/
   74 #define EXT4_HUGE_FILE          0x00040000      /* Set to each huge file */
   75 #define EXT4_EXTENTS            0x00080000      /* Inode uses extents */
   76 #define EXT4_EA_INODE           0x00200000      /* Inode used for large EA */
   77 #define EXT4_EOFBLOCKS          0x00400000 /* Blocks allocated beyond EOF */
   78 #define EXT4_INLINE_DATA        0x10000000 /* Inode has inline data */
   79 #define EXT4_PROJINHERIT        0x20000000 /* Children inherit project ID */
   80 
   81 /*
   82  * Definitions for nanosecond timestamps.
   83  * Ext3 inode versioning, 2006-12-13.
   84  */
   85 #define EXT3_EPOCH_BITS 2
   86 #define EXT3_EPOCH_MASK ((1 << EXT3_EPOCH_BITS) - 1)
   87 #define EXT3_NSEC_MASK  (~0UL << EXT3_EPOCH_BITS)
   88 
   89 #define E2DI_HAS_XTIME(ip)      (EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, \
   90                                     EXT2F_ROCOMPAT_EXTRA_ISIZE))
   91 #define E2DI_HAS_HUGE_FILE(ip)  (EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, \
   92                                     EXT2F_ROCOMPAT_HUGE_FILE))
   93 
   94 /*
   95  * Constants relative to the data blocks
   96  */
   97 #define EXT2_NDIR_BLOCKS                12
   98 #define EXT2_IND_BLOCK                  EXT2_NDIR_BLOCKS
   99 #define EXT2_DIND_BLOCK                 (EXT2_IND_BLOCK + 1)
  100 #define EXT2_TIND_BLOCK                 (EXT2_DIND_BLOCK + 1)
  101 #define EXT2_N_BLOCKS                   (EXT2_TIND_BLOCK + 1)
  102 #define EXT2_MAXSYMLINKLEN              (EXT2_N_BLOCKS * sizeof(uint32_t))
  103 
  104 /*
  105  * Structure of an inode on the disk
  106  */
  107 struct ext2fs_dinode {
  108         uint16_t        e2di_mode;      /*   0: IFMT, permissions; see below. */
  109         uint16_t        e2di_uid;       /*   2: Owner UID */
  110         uint32_t        e2di_size;      /*   4: Size (in bytes) */
  111         uint32_t        e2di_atime;     /*   8: Access time */
  112         uint32_t        e2di_ctime;     /*  12: Change time */
  113         uint32_t        e2di_mtime;     /*  16: Modification time */
  114         uint32_t        e2di_dtime;     /*  20: Deletion time */
  115         uint16_t        e2di_gid;       /*  24: Owner GID */
  116         uint16_t        e2di_nlink;     /*  26: File link count */
  117         uint32_t        e2di_nblock;    /*  28: Blocks count */
  118         uint32_t        e2di_flags;     /*  32: Status flags (chflags) */
  119         uint32_t        e2di_version;   /*  36: Low 32 bits inode version */
  120         uint32_t        e2di_blocks[EXT2_N_BLOCKS]; /* 40: disk blocks */
  121         uint32_t        e2di_gen;       /* 100: generation number */
  122         uint32_t        e2di_facl;      /* 104: Low EA block */
  123         uint32_t        e2di_size_high; /* 108: Upper bits of file size */
  124         uint32_t        e2di_faddr;     /* 112: Fragment address (obsolete) */
  125         uint16_t        e2di_nblock_high; /* 116: Blocks count bits 47:32 */
  126         uint16_t        e2di_facl_high; /* 118: File EA bits 47:32 */
  127         uint16_t        e2di_uid_high;  /* 120: Owner UID top 16 bits */
  128         uint16_t        e2di_gid_high;  /* 122: Owner GID top 16 bits */
  129         uint16_t        e2di_chksum_lo;   /* 124: Lower inode checksum */
  130         uint16_t        e2di_lx_reserved; /* 126: Unused */
  131         uint16_t        e2di_extra_isize; /* 128: Size of this inode */
  132         uint16_t        e2di_chksum_hi; /* 130: High inode checksum */
  133         uint32_t        e2di_ctime_extra; /* 132: Extra change time */
  134         uint32_t        e2di_mtime_extra; /* 136: Extra modification time */
  135         uint32_t        e2di_atime_extra; /* 140: Extra access time */
  136         uint32_t        e2di_crtime;    /* 144: Creation (birth)time */
  137         uint32_t        e2di_crtime_extra; /* 148: Extra creation (birth)time */
  138         uint32_t        e2di_version_hi;  /* 152: High bits of inode version */
  139         uint32_t        e2di_projid;    /* 156: Project ID */
  140 };
  141 
  142 #endif /* !_FS_EXT2FS_EXT2_DINODE_H_ */
  143 

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