ext2_inode_cnv.c

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    1 /*-
    2  * SPDX-License-Identifier: MIT-CMU
    3  *
    4  * Copyright (c) 1995 The University of Utah and
    5  * the Computer Systems Laboratory at the University of Utah (CSL).
    6  * All rights reserved.
    7  *
    8  * Permission to use, copy, modify and distribute this software is hereby
    9  * granted provided that (1) source code retains these copyright, permission,
   10  * and disclaimer notices, and (2) redistributions including binaries
   11  * reproduce the notices in supporting documentation, and (3) all advertising
   12  * materials mentioning features or use of this software display the following
   13  * acknowledgement: ``This product includes software developed by the
   14  * Computer Systems Laboratory at the University of Utah.''
   15  *
   16  * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
   17  * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
   18  * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   19  *
   20  * CSL requests users of this software to return to csl-dist@cs.utah.edu any
   21  * improvements that they make and grant CSL redistribution rights.
   22  *
   23  *      Utah $Hdr$
   24  * $FreeBSD$
   25  */
   26 
   27 /*
   28  * routines to convert on disk ext2 inodes into inodes and back
   29  */
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/endian.h>
   33 #include <sys/lock.h>
   34 #include <sys/sdt.h>
   35 #include <sys/stat.h>
   36 #include <sys/vnode.h>
   37 
   38 #include <fs/ext2fs/fs.h>
   39 #include <fs/ext2fs/inode.h>
   40 #include <fs/ext2fs/ext2fs.h>
   41 #include <fs/ext2fs/ext2_dinode.h>
   42 #include <fs/ext2fs/ext2_extern.h>
   43 
   44 SDT_PROVIDER_DECLARE(ext2fs);
   45 /*
   46  * ext2fs trace probe:
   47  * arg0: verbosity. Higher numbers give more verbose messages
   48  * arg1: Textual message
   49  */
   50 SDT_PROBE_DEFINE2(ext2fs, , trace, inode_cnv, "int", "char*");
   51 
   52 #ifdef EXT2FS_PRINT_EXTENTS
   53 void
   54 ext2_print_inode(struct inode *in)
   55 {
   56         int i;
   57         struct ext4_extent_header *ehp;
   58         struct ext4_extent *ep;
   59 
   60         printf("Inode: %5ju", (uintmax_t)in->i_number);
   61         printf( /* "Inode: %5d" */
   62             " Type: %10s Mode: 0x%o Flags: 0x%x  Version: %d acl: 0x%jx\n",
   63             "n/a", in->i_mode, in->i_flags, in->i_gen, in->i_facl);
   64         printf("User: %5u Group: %5u  Size: %ju\n",
   65             in->i_uid, in->i_gid, (uintmax_t)in->i_size);
   66         printf("Links: %3d Blockcount: %ju\n",
   67             in->i_nlink, (uintmax_t)in->i_blocks);
   68         printf("ctime: 0x%x ", in->i_ctime);
   69         printf("atime: 0x%x ", in->i_atime);
   70         printf("mtime: 0x%x ", in->i_mtime);
   71         if (E2DI_HAS_XTIME(in))
   72                 printf("crtime %#x\n", in->i_birthtime);
   73         else
   74                 printf("\n");
   75         if (in->i_flag & IN_E4EXTENTS) {
   76                 printf("Extents:\n");
   77                 ehp = (struct ext4_extent_header *)in->i_db;
   78                 printf("Header (magic 0x%x entries %d max %d depth %d gen %d)\n",
   79                     le16toh(ehp->eh_magic), le16toh(ehp->eh_ecount),
   80                     le16toh(ehp->eh_max), le16toh(ehp->eh_depth),
   81                     le32toh(ehp->eh_gen));
   82                 ep = (struct ext4_extent *)(char *)(ehp + 1);
   83                 printf("Index (blk %d len %d start_lo %d start_hi %d)\n",
   84                     le32toh(ep->e_blk),
   85                     le16toh(ep->e_len), le32toh(ep->e_start_lo),
   86                     le16toh(ep->e_start_hi));
   87                 printf("\n");
   88         } else {
   89                 printf("BLOCKS:");
   90                 for (i = 0; i < (in->i_blocks <= 24 ? (in->i_blocks + 1) / 2 : 12); i++)
   91                         printf("  %d", in->i_db[i]);
   92                 printf("\n");
   93         }
   94 }
   95 #endif  /* EXT2FS_PRINT_EXTENTS */
   96 
   97 #define XTIME_TO_NSEC(x)        ((le32toh(x) & EXT3_NSEC_MASK) >> 2)
   98 
   99 /*
  100  *      raw ext2 inode LE to host inode conversion
  101  */
  102 int
  103 ext2_ei2i(struct ext2fs_dinode *ei, struct inode *ip)
  104 {
  105         struct m_ext2fs *fs = ip->i_e2fs;
  106         uint32_t ei_flags_host;
  107         uint16_t ei_extra_isize_le;
  108         int i;
  109 
  110         if ((ip->i_number < EXT2_FIRST_INO(fs) && ip->i_number != EXT2_ROOTINO) ||
  111             (ip->i_number < EXT2_ROOTINO) ||
  112             (ip->i_number > le32toh(fs->e2fs->e2fs_icount))) {
  113                 SDT_PROBE2(ext2fs, , trace, inode_cnv, 1, "bad inode number");
  114                 return (EINVAL);
  115         }
  116 
  117         ip->i_nlink = le16toh(ei->e2di_nlink);
  118         if (ip->i_number == EXT2_ROOTINO && ip->i_nlink == 0) {
  119                 SDT_PROBE2(ext2fs, , trace, inode_cnv, 1, "root inode unallocated");
  120                 return (EINVAL);
  121         }
  122 
  123         /* Check extra inode size */
  124         ei_extra_isize_le = le16toh(ei->e2di_extra_isize);
  125         if (EXT2_INODE_SIZE(fs) > E2FS_REV0_INODE_SIZE) {
  126                 if (E2FS_REV0_INODE_SIZE + ei_extra_isize_le >
  127                     EXT2_INODE_SIZE(fs) || (ei_extra_isize_le & 3)) {
  128                         SDT_PROBE2(ext2fs, , trace, inode_cnv, 1,
  129                             "bad extra inode size");
  130                         return (EINVAL);
  131                 }
  132         }
  133 
  134         /*
  135          * Godmar thinks - if the link count is zero, then the inode is
  136          * unused - according to ext2 standards. Ufs marks this fact by
  137          * setting i_mode to zero - why ? I can see that this might lead to
  138          * problems in an undelete.
  139          */
  140         ip->i_mode = ip->i_nlink ? le16toh(ei->e2di_mode) : 0;
  141         ip->i_size = le32toh(ei->e2di_size);
  142         if (S_ISREG(ip->i_mode))
  143                 ip->i_size |= (uint64_t)le32toh(ei->e2di_size_high) << 32;
  144         ip->i_atime = le32toh(ei->e2di_atime);
  145         ip->i_mtime = le32toh(ei->e2di_mtime);
  146         ip->i_ctime = le32toh(ei->e2di_ctime);
  147         if (E2DI_HAS_XTIME(ip)) {
  148                 ip->i_atimensec = XTIME_TO_NSEC(ei->e2di_atime_extra);
  149                 ip->i_mtimensec = XTIME_TO_NSEC(ei->e2di_mtime_extra);
  150                 ip->i_ctimensec = XTIME_TO_NSEC(ei->e2di_ctime_extra);
  151                 ip->i_birthtime = le32toh(ei->e2di_crtime);
  152                 ip->i_birthnsec = XTIME_TO_NSEC(ei->e2di_crtime_extra);
  153         }
  154         ip->i_flags = 0;
  155         ei_flags_host = le32toh(ei->e2di_flags);
  156         ip->i_flags |= (ei_flags_host & EXT2_APPEND) ? SF_APPEND : 0;
  157         ip->i_flags |= (ei_flags_host & EXT2_IMMUTABLE) ? SF_IMMUTABLE : 0;
  158         ip->i_flags |= (ei_flags_host & EXT2_NODUMP) ? UF_NODUMP : 0;
  159         ip->i_flag |= (ei_flags_host & EXT3_INDEX) ? IN_E3INDEX : 0;
  160         ip->i_flag |= (ei_flags_host & EXT4_EXTENTS) ? IN_E4EXTENTS : 0;
  161         ip->i_blocks = le32toh(ei->e2di_nblock);
  162         ip->i_facl = le32toh(ei->e2di_facl);
  163         if (E2DI_HAS_HUGE_FILE(ip)) {
  164                 ip->i_blocks |= (uint64_t)le16toh(ei->e2di_nblock_high) << 32;
  165                 ip->i_facl |= (uint64_t)le16toh(ei->e2di_facl_high) << 32;
  166                 if (ei_flags_host & EXT4_HUGE_FILE)
  167                         ip->i_blocks = fsbtodb(ip->i_e2fs, ip->i_blocks);
  168         }
  169         ip->i_gen = le32toh(ei->e2di_gen);
  170         ip->i_uid = le16toh(ei->e2di_uid);
  171         ip->i_gid = le16toh(ei->e2di_gid);
  172         ip->i_uid |= (uint32_t)le16toh(ei->e2di_uid_high) << 16;
  173         ip->i_gid |= (uint32_t)le16toh(ei->e2di_gid_high) << 16;
  174 
  175         if ((ip->i_flag & IN_E4EXTENTS)) {
  176                 memcpy(ip->i_data, ei->e2di_blocks, sizeof(ei->e2di_blocks));
  177         } else {
  178                 for (i = 0; i < EXT2_NDADDR; i++)
  179                         ip->i_db[i] = le32toh(ei->e2di_blocks[i]);
  180                 for (i = 0; i < EXT2_NIADDR; i++)
  181                         ip->i_ib[i] = le32toh(ei->e2di_blocks[EXT2_NDIR_BLOCKS + i]);
  182         }
  183 
  184         /* Verify inode csum. */
  185         return (ext2_ei_csum_verify(ip, ei));
  186 }
  187 
  188 #define NSEC_TO_XTIME(t)        (htole32((t << 2) & EXT3_NSEC_MASK))
  189 
  190 /*
  191  *      inode to raw ext2 LE inode conversion
  192  */
  193 int
  194 ext2_i2ei(struct inode *ip, struct ext2fs_dinode *ei)
  195 {
  196         struct m_ext2fs *fs;
  197         int i;
  198 
  199         fs = ip->i_e2fs;
  200         ei->e2di_mode = htole16(ip->i_mode);
  201         ei->e2di_nlink = htole16(ip->i_nlink);
  202         ei->e2di_size = htole32(ip->i_size);
  203         if (S_ISREG(ip->i_mode))
  204                 ei->e2di_size_high = htole32(ip->i_size >> 32);
  205         ei->e2di_atime = htole32(ip->i_atime);
  206         ei->e2di_mtime = htole32(ip->i_mtime);
  207         ei->e2di_ctime = htole32(ip->i_ctime);
  208         /*
  209          * Godmar thinks: if dtime is nonzero, ext2 says this inode has been
  210          * deleted, this would correspond to a zero link count
  211          */
  212         ei->e2di_dtime = htole32(le16toh(ei->e2di_nlink) ? 0 :
  213             le32toh(ei->e2di_mtime));
  214         if (E2DI_HAS_XTIME(ip)) {
  215                 ei->e2di_ctime_extra = NSEC_TO_XTIME(ip->i_ctimensec);
  216                 ei->e2di_mtime_extra = NSEC_TO_XTIME(ip->i_mtimensec);
  217                 ei->e2di_atime_extra = NSEC_TO_XTIME(ip->i_atimensec);
  218                 ei->e2di_crtime = htole32(ip->i_birthtime);
  219                 ei->e2di_crtime_extra = NSEC_TO_XTIME(ip->i_birthnsec);
  220         }
  221         /* Keep these in host endian for a while since they change a lot */
  222         ei->e2di_flags = 0;
  223         ei->e2di_flags |= htole32((ip->i_flags & SF_APPEND) ? EXT2_APPEND : 0);
  224         ei->e2di_flags |= htole32((ip->i_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE : 0);
  225         ei->e2di_flags |= htole32((ip->i_flags & UF_NODUMP) ? EXT2_NODUMP : 0);
  226         ei->e2di_flags |= htole32((ip->i_flag & IN_E3INDEX) ? EXT3_INDEX : 0);
  227         ei->e2di_flags |= htole32((ip->i_flag & IN_E4EXTENTS) ? EXT4_EXTENTS : 0);
  228         if (ip->i_blocks > ~0U &&
  229             !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_HUGE_FILE)) {
  230                 SDT_PROBE2(ext2fs, , trace, inode_cnv, 1, "i_blocks value is out of range");
  231                 return (EIO);
  232         }
  233         if (ip->i_blocks <= 0xffffffffffffULL) {
  234                 ei->e2di_nblock = htole32(ip->i_blocks & 0xffffffff);
  235                 ei->e2di_nblock_high = htole16(ip->i_blocks >> 32 & 0xffff);
  236         } else {
  237                 ei->e2di_flags |= htole32(EXT4_HUGE_FILE);
  238                 ei->e2di_nblock = htole32(dbtofsb(fs, ip->i_blocks));
  239                 ei->e2di_nblock_high = htole16(dbtofsb(fs, ip->i_blocks) >> 32 & 0xffff);
  240         }
  241 
  242         ei->e2di_facl = htole32(ip->i_facl & 0xffffffff);
  243         ei->e2di_facl_high = htole16(ip->i_facl >> 32 & 0xffff);
  244         ei->e2di_gen = htole32(ip->i_gen);
  245         ei->e2di_uid = htole16(ip->i_uid & 0xffff);
  246         ei->e2di_uid_high = htole16(ip->i_uid >> 16 & 0xffff);
  247         ei->e2di_gid = htole16(ip->i_gid & 0xffff);
  248         ei->e2di_gid_high = htole16(ip->i_gid >> 16 & 0xffff);
  249 
  250         if ((ip->i_flag & IN_E4EXTENTS)) {
  251                 memcpy(ei->e2di_blocks, ip->i_data, sizeof(ei->e2di_blocks));
  252         } else {
  253                 for (i = 0; i < EXT2_NDADDR; i++)
  254                         ei->e2di_blocks[i] = htole32(ip->i_db[i]);
  255                 for (i = 0; i < EXT2_NIADDR; i++)
  256                         ei->e2di_blocks[EXT2_NDIR_BLOCKS + i] = htole32(ip->i_ib[i]);
  257         }
  258 
  259         /* Set inode csum. */
  260         ext2_ei_csum_set(ip, ei);
  261 
  262         return (0);
  263 }
Cache object: 1852ad07ed058bd2a611341874830837
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FreeBSD/Linux Kernel Cross Reference sys/fs/ext2fs/ext2_inode_cnv.c

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