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: stable/11/sys/fs/ext2fs/ext2_inode_cnv.c 324627 2017-10-15 14:03:53Z fsu $
   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/fs.h>
   36 #include <fs/ext2fs/inode.h>
   37 #include <fs/ext2fs/ext2fs.h>
   38 #include <fs/ext2fs/ext2_dinode.h>
   39 #include <fs/ext2fs/ext2_extern.h>
   40 
   41 #define XTIME_TO_NSEC(x)        ((x & EXT3_NSEC_MASK) >> 2)
   42 #define NSEC_TO_XTIME(t)        (le32toh(t << 2) & EXT3_NSEC_MASK)
   43 
   44 #ifdef EXT2FS_DEBUG
   45 void
   46 ext2_print_inode(struct inode *in)
   47 {
   48         int i;
   49         struct ext4_extent_header *ehp;
   50         struct ext4_extent *ep;
   51 
   52         printf("Inode: %5ju", (uintmax_t)in->i_number);
   53         printf( /* "Inode: %5d" */
   54             " Type: %10s Mode: 0x%o Flags: 0x%x  Version: %d acl: 0x%llx\n",
   55             "n/a", in->i_mode, in->i_flags, in->i_gen, in->i_facl);
   56         printf("User: %5u Group: %5u  Size: %ju\n",
   57             in->i_uid, in->i_gid, (uintmax_t)in->i_size);
   58         printf("Links: %3d Blockcount: %ju\n",
   59             in->i_nlink, (uintmax_t)in->i_blocks);
   60         printf("ctime: 0x%x", in->i_ctime);
   61         printf("atime: 0x%x", in->i_atime);
   62         printf("mtime: 0x%x", in->i_mtime);
   63         if (E2DI_HAS_XTIME(in))
   64                 printf("crtime %#x ", in->i_birthtime);
   65         printf("BLOCKS:");
   66         for (i = 0; i < (in->i_blocks <= 24 ? (in->i_blocks + 1) / 2 : 12); i++)
   67                 printf("  %d", in->i_db[i]);
   68         printf("\n");
   69         printf("Extents:\n");
   70         ehp = (struct ext4_extent_header *)in->i_db;
   71         printf("Header (magic 0x%x entries %d max %d depth %d gen %d)\n",
   72             ehp->eh_magic, ehp->eh_ecount, ehp->eh_max, ehp->eh_depth,
   73             ehp->eh_gen);
   74         ep = (struct ext4_extent *)(char *)(ehp + 1);
   75         printf("Index (blk %d len %d start_lo %d start_hi %d)\n", ep->e_blk,
   76             ep->e_len, ep->e_start_lo, ep->e_start_hi);
   77         printf("\n");
   78 }
   79 #endif  /* EXT2FS_DEBUG */
   80 
   81 /*
   82  *      raw ext2 inode to inode
   83  */
   84 void
   85 ext2_ei2i(struct ext2fs_dinode *ei, struct inode *ip)
   86 {
   87         int i;
   88 
   89         ip->i_nlink = ei->e2di_nlink;
   90         /*
   91          * Godmar thinks - if the link count is zero, then the inode is
   92          * unused - according to ext2 standards. Ufs marks this fact by
   93          * setting i_mode to zero - why ? I can see that this might lead to
   94          * problems in an undelete.
   95          */
   96         ip->i_mode = ei->e2di_nlink ? ei->e2di_mode : 0;
   97         ip->i_size = ei->e2di_size;
   98         if (S_ISREG(ip->i_mode))
   99                 ip->i_size |= ((u_int64_t)ei->e2di_size_high) << 32;
  100         ip->i_atime = ei->e2di_atime;
  101         ip->i_mtime = ei->e2di_mtime;
  102         ip->i_ctime = ei->e2di_ctime;
  103         if (E2DI_HAS_XTIME(ip)) {
  104                 ip->i_atimensec = XTIME_TO_NSEC(ei->e2di_atime_extra);
  105                 ip->i_mtimensec = XTIME_TO_NSEC(ei->e2di_mtime_extra);
  106                 ip->i_ctimensec = XTIME_TO_NSEC(ei->e2di_ctime_extra);
  107                 ip->i_birthtime = ei->e2di_crtime;
  108                 ip->i_birthnsec = XTIME_TO_NSEC(ei->e2di_crtime_extra);
  109         }
  110         ip->i_flags = 0;
  111         ip->i_flags |= (ei->e2di_flags & EXT2_APPEND) ? SF_APPEND : 0;
  112         ip->i_flags |= (ei->e2di_flags & EXT2_IMMUTABLE) ? SF_IMMUTABLE : 0;
  113         ip->i_flags |= (ei->e2di_flags & EXT2_NODUMP) ? UF_NODUMP : 0;
  114         ip->i_flag |= (ei->e2di_flags & EXT3_INDEX) ? IN_E3INDEX : 0;
  115         ip->i_flag |= (ei->e2di_flags & EXT4_EXTENTS) ? IN_E4EXTENTS : 0;
  116         ip->i_blocks = ei->e2di_nblock;
  117         ip->i_facl = ei->e2di_facl;
  118         if (E2DI_HAS_HUGE_FILE(ip)) {
  119                 ip->i_blocks |= (uint64_t)ei->e2di_nblock_high << 32;
  120                 ip->i_facl |= (uint64_t)ei->e2di_facl_high << 32;
  121                 if (ei->e2di_flags & EXT4_HUGE_FILE)
  122                         ip->i_blocks = fsbtodb(ip->i_e2fs, ip->i_blocks);
  123         }
  124         ip->i_gen = ei->e2di_gen;
  125         ip->i_uid = ei->e2di_uid;
  126         ip->i_gid = ei->e2di_gid;
  127         ip->i_uid |= (uint32_t)ei->e2di_uid_high << 16;
  128         ip->i_gid |= (uint32_t)ei->e2di_gid_high << 16;
  129 
  130         for (i = 0; i < NDADDR; i++)
  131                 ip->i_db[i] = ei->e2di_blocks[i];
  132         for (i = 0; i < NIADDR; i++)
  133                 ip->i_ib[i] = ei->e2di_blocks[EXT2_NDIR_BLOCKS + i];
  134 }
  135 
  136 /*
  137  *      inode to raw ext2 inode
  138  */
  139 int
  140 ext2_i2ei(struct inode *ip, struct ext2fs_dinode *ei)
  141 {
  142         struct m_ext2fs *fs;
  143         int i;
  144 
  145         fs = ip->i_e2fs;
  146         ei->e2di_mode = ip->i_mode;
  147         ei->e2di_nlink = ip->i_nlink;
  148         /*
  149          * Godmar thinks: if dtime is nonzero, ext2 says this inode has been
  150          * deleted, this would correspond to a zero link count
  151          */
  152         ei->e2di_dtime = ei->e2di_nlink ? 0 : ip->i_mtime;
  153         ei->e2di_size = ip->i_size;
  154         if (S_ISREG(ip->i_mode))
  155                 ei->e2di_size_high = ip->i_size >> 32;
  156         ei->e2di_atime = ip->i_atime;
  157         ei->e2di_mtime = ip->i_mtime;
  158         ei->e2di_ctime = ip->i_ctime;
  159         if (E2DI_HAS_XTIME(ip)) {
  160                 ei->e2di_ctime_extra = NSEC_TO_XTIME(ip->i_ctimensec);
  161                 ei->e2di_mtime_extra = NSEC_TO_XTIME(ip->i_mtimensec);
  162                 ei->e2di_atime_extra = NSEC_TO_XTIME(ip->i_atimensec);
  163                 ei->e2di_crtime = ip->i_birthtime;
  164                 ei->e2di_crtime_extra = NSEC_TO_XTIME(ip->i_birthnsec);
  165         }
  166         ei->e2di_flags = 0;
  167         ei->e2di_flags |= (ip->i_flags & SF_APPEND) ? EXT2_APPEND : 0;
  168         ei->e2di_flags |= (ip->i_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE : 0;
  169         ei->e2di_flags |= (ip->i_flags & UF_NODUMP) ? EXT2_NODUMP : 0;
  170         ei->e2di_flags |= (ip->i_flag & IN_E3INDEX) ? EXT3_INDEX : 0;
  171         ei->e2di_flags |= (ip->i_flag & IN_E4EXTENTS) ? EXT4_EXTENTS : 0;
  172         if (ip->i_blocks > ~0U &&
  173             !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_HUGE_FILE)) {
  174                 ext2_fserr(fs, ip->i_uid, "i_blocks value is out of range");
  175                 return (EIO);
  176         }
  177         if (ip->i_blocks <= 0xffffffffffffULL) {
  178                 ei->e2di_nblock = ip->i_blocks & 0xffffffff;
  179                 ei->e2di_nblock_high = ip->i_blocks >> 32 & 0xffff;
  180         } else {
  181                 ei->e2di_flags |= EXT4_HUGE_FILE;
  182                 ei->e2di_nblock = dbtofsb(fs, ip->i_blocks);
  183                 ei->e2di_nblock_high = dbtofsb(fs, ip->i_blocks) >> 32 & 0xffff;
  184         }
  185         ei->e2di_facl = ip->i_facl & 0xffffffff;
  186         ei->e2di_facl_high = ip->i_facl >> 32 & 0xffff;
  187         ei->e2di_gen = ip->i_gen;
  188         ei->e2di_uid = ip->i_uid & 0xffff;
  189         ei->e2di_uid_high = ip->i_uid >> 16 & 0xffff;
  190         ei->e2di_gid = ip->i_gid & 0xffff;
  191         ei->e2di_gid_high = ip->i_gid >> 16 & 0xffff;
  192 
  193         for (i = 0; i < NDADDR; i++)
  194                 ei->e2di_blocks[i] = ip->i_db[i];
  195         for (i = 0; i < NIADDR; i++)
  196                 ei->e2di_blocks[EXT2_NDIR_BLOCKS + i] = ip->i_ib[i];
  197 
  198         return (0);
  199 }

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