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_inode_cnv.c

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    1 /*-
    2  * Copyright (c) 1995 The University of Utah and
    3  * the Computer Systems Laboratory at the University of Utah (CSL).
    4  * All rights reserved.
    5  *
    6  * Permission to use, copy, modify and distribute this software is hereby
    7  * granted provided that (1) source code retains these copyright, permission,
    8  * and disclaimer notices, and (2) redistributions including binaries
    9  * reproduce the notices in supporting documentation, and (3) all advertising
   10  * materials mentioning features or use of this software display the following
   11  * acknowledgement: ``This product includes software developed by the
   12  * Computer Systems Laboratory at the University of Utah.''
   13  *
   14  * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
   15  * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
   16  * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   17  *
   18  * CSL requests users of this software to return to csl-dist@cs.utah.edu any
   19  * improvements that they make and grant CSL redistribution rights.
   20  *
   21  *      Utah $Hdr$
   22  * $FreeBSD: releng/9.2/sys/fs/ext2fs/ext2_inode_cnv.c 251447 2013-06-06 03:18:07Z pfg $
   23  */
   24 
   25 /*
   26  * routines to convert on disk ext2 inodes into inodes and back
   27  */
   28 #include <sys/param.h>
   29 #include <sys/systm.h>
   30 #include <sys/endian.h>
   31 #include <sys/lock.h>
   32 #include <sys/stat.h>
   33 #include <sys/vnode.h>
   34 
   35 #include <fs/ext2fs/inode.h>
   36 #include <fs/ext2fs/ext2fs.h>
   37 #include <fs/ext2fs/ext2_dinode.h>
   38 #include <fs/ext2fs/ext2_extern.h>
   39 
   40 #define XTIME_TO_NSEC(x)        ((x & EXT3_NSEC_MASK) >> 2)
   41 #define NSEC_TO_XTIME(t)        (le32toh(t << 2) & EXT3_NSEC_MASK)
   42 
   43 void
   44 ext2_print_inode(struct inode *in)
   45 {
   46         int i;
   47 
   48         printf( "Inode: %5d", in->i_number);
   49         printf( /* "Inode: %5d" */
   50                 " Type: %10s Mode: 0x%o Flags: 0x%x  Version: %d\n",
   51                 "n/a", in->i_mode, in->i_flags, in->i_gen);
   52         printf( "User: %5lu Group: %5lu  Size: %lu\n",
   53                 (unsigned long)in->i_uid, (unsigned long)in->i_gid,
   54                 (unsigned long)in->i_size);
   55         printf( "Links: %3d Blockcount: %d\n",
   56                 in->i_nlink, in->i_blocks);
   57         printf( "ctime: 0x%x", in->i_ctime);
   58         printf( "atime: 0x%x", in->i_atime);
   59         printf( "mtime: 0x%x", in->i_mtime);
   60         printf( "BLOCKS: ");
   61         for(i=0; i < (in->i_blocks <= 24 ? ((in->i_blocks+1)/2): 12); i++)
   62                 printf("%d ", in->i_db[i]);
   63         printf("\n");
   64 }
   65 
   66 /*
   67  *      raw ext2 inode to inode
   68  */
   69 void
   70 ext2_ei2i(struct ext2fs_dinode *ei, struct inode *ip)
   71 {
   72         int i;
   73 
   74         ip->i_nlink = ei->e2di_nlink;
   75         /* Godmar thinks - if the link count is zero, then the inode is
   76            unused - according to ext2 standards. Ufs marks this fact
   77            by setting i_mode to zero - why ?
   78            I can see that this might lead to problems in an undelete.
   79         */
   80         ip->i_mode = ei->e2di_nlink ? ei->e2di_mode : 0;
   81         ip->i_size = ei->e2di_size;
   82         if (S_ISREG(ip->i_mode))
   83                 ip->i_size |= ((u_int64_t)ei->e2di_size_high) << 32;
   84         ip->i_atime = ei->e2di_atime;
   85         ip->i_mtime = ei->e2di_mtime;
   86         ip->i_ctime = ei->e2di_ctime;
   87         if (E2DI_HAS_XTIME(ip)) {
   88                 ip->i_atimensec = XTIME_TO_NSEC(ei->e2di_atime_extra);
   89                 ip->i_mtimensec = XTIME_TO_NSEC(ei->e2di_mtime_extra);
   90                 ip->i_ctimensec = XTIME_TO_NSEC(ei->e2di_ctime_extra);
   91                 ip->i_birthtime = ei->e2di_crtime;
   92                 ip->i_birthnsec = XTIME_TO_NSEC(ei->e2di_crtime_extra);
   93         }
   94         ip->i_flags = 0;
   95         ip->i_flags |= (ei->e2di_flags & EXT2_APPEND) ? SF_APPEND : 0;
   96         ip->i_flags |= (ei->e2di_flags & EXT2_IMMUTABLE) ? SF_IMMUTABLE : 0;
   97         ip->i_flags |= (ei->e2di_flags & EXT2_NODUMP) ? UF_NODUMP : 0;
   98         ip->i_blocks = ei->e2di_nblock;
   99         ip->i_gen = ei->e2di_gen;
  100         ip->i_uid = ei->e2di_uid;
  101         ip->i_gid = ei->e2di_gid;
  102         /* XXX use memcpy */
  103         for(i = 0; i < NDADDR; i++)
  104                 ip->i_db[i] = ei->e2di_blocks[i];
  105         for(i = 0; i < NIADDR; i++)
  106                 ip->i_ib[i] = ei->e2di_blocks[EXT2_NDIR_BLOCKS + i];
  107 }
  108 
  109 /*
  110  *      inode to raw ext2 inode
  111  */
  112 void
  113 ext2_i2ei(struct inode *ip, struct ext2fs_dinode *ei)
  114 {
  115         int i;
  116 
  117         ei->e2di_mode = ip->i_mode;
  118         ei->e2di_nlink = ip->i_nlink;
  119         /* 
  120            Godmar thinks: if dtime is nonzero, ext2 says this inode
  121            has been deleted, this would correspond to a zero link count
  122          */
  123         ei->e2di_dtime = ei->e2di_nlink ? 0 : ip->i_mtime;
  124         ei->e2di_size = ip->i_size;
  125         if (S_ISREG(ip->i_mode))
  126                 ei->e2di_size_high = ip->i_size >> 32;
  127         ei->e2di_atime = ip->i_atime;
  128         ei->e2di_mtime = ip->i_mtime;
  129         ei->e2di_ctime = ip->i_ctime;
  130         if (E2DI_HAS_XTIME(ip)) {
  131                 ei->e2di_ctime_extra = NSEC_TO_XTIME(ip->i_ctimensec);
  132                 ei->e2di_mtime_extra = NSEC_TO_XTIME(ip->i_mtimensec);
  133                 ei->e2di_atime_extra = NSEC_TO_XTIME(ip->i_atimensec);
  134                 ei->e2di_crtime = ip->i_birthtime;
  135                 ei->e2di_crtime_extra = NSEC_TO_XTIME(ip->i_birthnsec);
  136         }
  137         ei->e2di_flags = ip->i_flags;
  138         ei->e2di_flags = 0;
  139         ei->e2di_flags |= (ip->i_flags & SF_APPEND) ? EXT2_APPEND: 0;
  140         ei->e2di_flags |= (ip->i_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE: 0;
  141         ei->e2di_flags |= (ip->i_flags & UF_NODUMP) ? EXT2_NODUMP: 0;
  142         ei->e2di_nblock = ip->i_blocks;
  143         ei->e2di_gen = ip->i_gen;
  144         ei->e2di_uid = ip->i_uid;
  145         ei->e2di_gid = ip->i_gid;
  146         /* XXX use memcpy */
  147         for(i = 0; i < NDADDR; i++)
  148                 ei->e2di_blocks[i] = ip->i_db[i];
  149         for(i = 0; i < NIADDR; i++)
  150                 ei->e2di_blocks[EXT2_NDIR_BLOCKS + i] = ip->i_ib[i];
  151 }

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