FreeBSD/Linux Kernel Cross Reference
sys/fs/ext2fs/ext2_inode_cnv.c

     /*-
      * Copyright (c) 1995 The University of Utah and
      * the Computer Systems Laboratory at the University of Utah (CSL).
      * All rights reserved.
      *
      * Permission to use, copy, modify and distribute this software is hereby
      * granted provided that (1) source code retains these copyright, permission,
      * and disclaimer notices, and (2) redistributions including binaries
      * reproduce the notices in supporting documentation, and (3) all advertising
     * materials mentioning features or use of this software display the following
     * acknowledgement: ``This product includes software developed by the
     * Computer Systems Laboratory at the University of Utah.''
     *
     * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
     * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
     * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     *
     * CSL requests users of this software to return to csl-dist@cs.utah.edu any
     * improvements that they make and grant CSL redistribution rights.
     *
     *      Utah $Hdr$
     * $FreeBSD$
     */
    
    /*
     * routines to convert on disk ext2 inodes into inodes and back
     */
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/endian.h>
    #include <sys/lock.h>
    #include <sys/stat.h>
    #include <sys/vnode.h>
    
    #include <fs/ext2fs/fs.h>
    #include <fs/ext2fs/inode.h>
    #include <fs/ext2fs/ext2fs.h>
    #include <fs/ext2fs/ext2_dinode.h>
    #include <fs/ext2fs/ext2_extern.h>
    
    #define XTIME_TO_NSEC(x)        ((x & EXT3_NSEC_MASK) >> 2)
    #define NSEC_TO_XTIME(t)        (le32toh(t << 2) & EXT3_NSEC_MASK)
    
    #ifdef EXT2FS_DEBUG
    void
    ext2_print_inode(struct inode *in)
    {
            int i;
            struct ext4_extent_header *ehp;
            struct ext4_extent *ep;
    
            printf("Inode: %5ju", (uintmax_t)in->i_number);
            printf( /* "Inode: %5d" */
                " Type: %10s Mode: 0x%o Flags: 0x%x  Version: %d acl: 0x%llx\n",
                "n/a", in->i_mode, in->i_flags, in->i_gen, in->i_facl);
            printf("User: %5u Group: %5u  Size: %ju\n",
                in->i_uid, in->i_gid, (uintmax_t)in->i_size);
            printf("Links: %3d Blockcount: %ju\n",
                in->i_nlink, (uintmax_t)in->i_blocks);
            printf("ctime: 0x%x", in->i_ctime);
            printf("atime: 0x%x", in->i_atime);
            printf("mtime: 0x%x", in->i_mtime);
            if (E2DI_HAS_XTIME(in))
                    printf("crtime %#x ", in->i_birthtime);
            printf("BLOCKS:");
            for (i = 0; i < (in->i_blocks <= 24 ? (in->i_blocks + 1) / 2 : 12); i++)
                    printf("  %d", in->i_db[i]);
            printf("\n");
            printf("Extents:\n");
            ehp = (struct ext4_extent_header *)in->i_db;
            printf("Header (magic 0x%x entries %d max %d depth %d gen %d)\n",
                ehp->eh_magic, ehp->eh_ecount, ehp->eh_max, ehp->eh_depth,
                ehp->eh_gen);
            ep = (struct ext4_extent *)(char *)(ehp + 1);
            printf("Index (blk %d len %d start_lo %d start_hi %d)\n", ep->e_blk,
                ep->e_len, ep->e_start_lo, ep->e_start_hi);
            printf("\n");
    }
    #endif  /* EXT2FS_DEBUG */
    
    /*
     *      raw ext2 inode to inode
     */
    void
    ext2_ei2i(struct ext2fs_dinode *ei, struct inode *ip)
    {
            int i;
    
            ip->i_nlink = ei->e2di_nlink;
            /*
             * Godmar thinks - if the link count is zero, then the inode is
             * unused - according to ext2 standards. Ufs marks this fact by
             * setting i_mode to zero - why ? I can see that this might lead to
             * problems in an undelete.
             */
            ip->i_mode = ei->e2di_nlink ? ei->e2di_mode : 0;
            ip->i_size = ei->e2di_size;
            if (S_ISREG(ip->i_mode))
                    ip->i_size |= ((u_int64_t)ei->e2di_size_high) << 32;
           ip->i_atime = ei->e2di_atime;
           ip->i_mtime = ei->e2di_mtime;
           ip->i_ctime = ei->e2di_ctime;
           if (E2DI_HAS_XTIME(ip)) {
                   ip->i_atimensec = XTIME_TO_NSEC(ei->e2di_atime_extra);
                   ip->i_mtimensec = XTIME_TO_NSEC(ei->e2di_mtime_extra);
                   ip->i_ctimensec = XTIME_TO_NSEC(ei->e2di_ctime_extra);
                   ip->i_birthtime = ei->e2di_crtime;
                   ip->i_birthnsec = XTIME_TO_NSEC(ei->e2di_crtime_extra);
           }
           ip->i_flags = 0;
           ip->i_flags |= (ei->e2di_flags & EXT2_APPEND) ? SF_APPEND : 0;
           ip->i_flags |= (ei->e2di_flags & EXT2_IMMUTABLE) ? SF_IMMUTABLE : 0;
           ip->i_flags |= (ei->e2di_flags & EXT2_NODUMP) ? UF_NODUMP : 0;
           ip->i_flag |= (ei->e2di_flags & EXT3_INDEX) ? IN_E3INDEX : 0;
           ip->i_flag |= (ei->e2di_flags & EXT4_EXTENTS) ? IN_E4EXTENTS : 0;
           ip->i_blocks = ei->e2di_nblock;
           ip->i_facl = ei->e2di_facl;
           if (E2DI_HAS_HUGE_FILE(ip)) {
                   ip->i_blocks |= (uint64_t)ei->e2di_nblock_high << 32;
                   ip->i_facl |= (uint64_t)ei->e2di_facl_high << 32;
                   if (ei->e2di_flags & EXT4_HUGE_FILE)
                           ip->i_blocks = fsbtodb(ip->i_e2fs, ip->i_blocks);
           }
           ip->i_gen = ei->e2di_gen;
           ip->i_uid = ei->e2di_uid;
           ip->i_gid = ei->e2di_gid;
           ip->i_uid |= (uint32_t)ei->e2di_uid_high << 16;
           ip->i_gid |= (uint32_t)ei->e2di_gid_high << 16;
   
           for (i = 0; i < NDADDR; i++)
                   ip->i_db[i] = ei->e2di_blocks[i];
           for (i = 0; i < NIADDR; i++)
                   ip->i_ib[i] = ei->e2di_blocks[EXT2_NDIR_BLOCKS + i];
   }
   
   /*
    *      inode to raw ext2 inode
    */
   int
   ext2_i2ei(struct inode *ip, struct ext2fs_dinode *ei)
   {
           struct m_ext2fs *fs;
           int i;
   
           fs = ip->i_e2fs;
           ei->e2di_mode = ip->i_mode;
           ei->e2di_nlink = ip->i_nlink;
           /*
            * Godmar thinks: if dtime is nonzero, ext2 says this inode has been
            * deleted, this would correspond to a zero link count
            */
           ei->e2di_dtime = ei->e2di_nlink ? 0 : ip->i_mtime;
           ei->e2di_size = ip->i_size;
           if (S_ISREG(ip->i_mode))
                   ei->e2di_size_high = ip->i_size >> 32;
           ei->e2di_atime = ip->i_atime;
           ei->e2di_mtime = ip->i_mtime;
           ei->e2di_ctime = ip->i_ctime;
           if (E2DI_HAS_XTIME(ip)) {
                   ei->e2di_ctime_extra = NSEC_TO_XTIME(ip->i_ctimensec);
                   ei->e2di_mtime_extra = NSEC_TO_XTIME(ip->i_mtimensec);
                   ei->e2di_atime_extra = NSEC_TO_XTIME(ip->i_atimensec);
                   ei->e2di_crtime = ip->i_birthtime;
                   ei->e2di_crtime_extra = NSEC_TO_XTIME(ip->i_birthnsec);
           }
           ei->e2di_flags = 0;
           ei->e2di_flags |= (ip->i_flags & SF_APPEND) ? EXT2_APPEND : 0;
           ei->e2di_flags |= (ip->i_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE : 0;
           ei->e2di_flags |= (ip->i_flags & UF_NODUMP) ? EXT2_NODUMP : 0;
           ei->e2di_flags |= (ip->i_flag & IN_E3INDEX) ? EXT3_INDEX : 0;
           ei->e2di_flags |= (ip->i_flag & IN_E4EXTENTS) ? EXT4_EXTENTS : 0;
           if (ip->i_blocks > ~0U &&
               !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_HUGE_FILE)) {
                   ext2_fserr(fs, ip->i_uid, "i_blocks value is out of range");
                   return (EIO);
           }
           if (ip->i_blocks <= 0xffffffffffffULL) {
                   ei->e2di_nblock = ip->i_blocks & 0xffffffff;
                   ei->e2di_nblock_high = ip->i_blocks >> 32 & 0xffff;
           } else {
                   ei->e2di_flags |= EXT4_HUGE_FILE;
                   ei->e2di_nblock = dbtofsb(fs, ip->i_blocks);
                   ei->e2di_nblock_high = dbtofsb(fs, ip->i_blocks) >> 32 & 0xffff;
           }
           ei->e2di_facl = ip->i_facl & 0xffffffff;
           ei->e2di_facl_high = ip->i_facl >> 32 & 0xffff;
           ei->e2di_gen = ip->i_gen;
           ei->e2di_uid = ip->i_uid & 0xffff;
           ei->e2di_uid_high = ip->i_uid >> 16 & 0xffff;
           ei->e2di_gid = ip->i_gid & 0xffff;
           ei->e2di_gid_high = ip->i_gid >> 16 & 0xffff;
   
           for (i = 0; i < NDADDR; i++)
                   ei->e2di_blocks[i] = ip->i_db[i];
           for (i = 0; i < NIADDR; i++)
                   ei->e2di_blocks[EXT2_NDIR_BLOCKS + i] = ip->i_ib[i];
   
           return (0);
   }

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