ext2_inode_cnv.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10

    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 #define XTIME_TO_NSEC(x)        ((x & EXT3_NSEC_MASK) >> 2)
   53 #define NSEC_TO_XTIME(t)        (le32toh(t << 2) & EXT3_NSEC_MASK)
   54 
   55 #ifdef EXT2FS_PRINT_EXTENTS
   56 void
   57 ext2_print_inode(struct inode *in)
   58 {
   59         int i;
   60         struct ext4_extent_header *ehp;
   61         struct ext4_extent *ep;
   62 
   63         printf("Inode: %5ju", (uintmax_t)in->i_number);
   64         printf( /* "Inode: %5d" */
   65             " Type: %10s Mode: 0x%o Flags: 0x%x  Version: %d acl: 0x%jx\n",
   66             "n/a", in->i_mode, in->i_flags, in->i_gen, in->i_facl);
   67         printf("User: %5u Group: %5u  Size: %ju\n",
   68             in->i_uid, in->i_gid, (uintmax_t)in->i_size);
   69         printf("Links: %3d Blockcount: %ju\n",
   70             in->i_nlink, (uintmax_t)in->i_blocks);
   71         printf("ctime: 0x%x ", in->i_ctime);
   72         printf("atime: 0x%x ", in->i_atime);
   73         printf("mtime: 0x%x ", in->i_mtime);
   74         if (E2DI_HAS_XTIME(in))
   75                 printf("crtime %#x\n", in->i_birthtime);
   76         else
   77                 printf("\n");
   78         if (in->i_flag & IN_E4EXTENTS) {
   79                 printf("Extents:\n");
   80                 ehp = (struct ext4_extent_header *)in->i_db;
   81                 printf("Header (magic 0x%x entries %d max %d depth %d gen %d)\n",
   82                     ehp->eh_magic, ehp->eh_ecount, ehp->eh_max, ehp->eh_depth,
   83                     ehp->eh_gen);
   84                 ep = (struct ext4_extent *)(char *)(ehp + 1);
   85                 printf("Index (blk %d len %d start_lo %d start_hi %d)\n", ep->e_blk,
   86                     ep->e_len, ep->e_start_lo, 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 /*
   98  *      raw ext2 inode to inode
   99  */
  100 int
  101 ext2_ei2i(struct ext2fs_dinode *ei, struct inode *ip)
  102 {
  103         struct m_ext2fs *fs = ip->i_e2fs;
  104 
  105         if ((ip->i_number < EXT2_FIRST_INO(fs) && ip->i_number != EXT2_ROOTINO) ||
  106             (ip->i_number < EXT2_ROOTINO) ||
  107             (ip->i_number > fs->e2fs->e2fs_icount)) {
  108                 SDT_PROBE2(ext2fs, , trace, inode_cnv, 1, "bad inode number");
  109                 return (EINVAL);
  110         }
  111 
  112         if (ip->i_number == EXT2_ROOTINO && ei->e2di_nlink == 0) {
  113                 SDT_PROBE2(ext2fs, , trace, inode_cnv, 1, "root inode unallocated");
  114                 return (EINVAL);
  115         }
  116         ip->i_nlink = ei->e2di_nlink;
  117 
  118         /* Check extra inode size */
  119         if (EXT2_INODE_SIZE(fs) > E2FS_REV0_INODE_SIZE) {
  120                 if (E2FS_REV0_INODE_SIZE + ei->e2di_extra_isize >
  121                     EXT2_INODE_SIZE(fs) || (ei->e2di_extra_isize & 3)) {
  122                         SDT_PROBE2(ext2fs, , trace, inode_cnv, 1,
  123                             "bad extra inode size");
  124                         return (EINVAL);
  125                 }
  126         }
  127 
  128         /*
  129          * Godmar thinks - if the link count is zero, then the inode is
  130          * unused - according to ext2 standards. Ufs marks this fact by
  131          * setting i_mode to zero - why ? I can see that this might lead to
  132          * problems in an undelete.
  133          */
  134         ip->i_mode = ei->e2di_nlink ? ei->e2di_mode : 0;
  135         ip->i_size = ei->e2di_size;
  136         if (S_ISREG(ip->i_mode))
  137                 ip->i_size |= ((u_int64_t)ei->e2di_size_high) << 32;
  138         ip->i_atime = ei->e2di_atime;
  139         ip->i_mtime = ei->e2di_mtime;
  140         ip->i_ctime = ei->e2di_ctime;
  141         if (E2DI_HAS_XTIME(ip)) {
  142                 ip->i_atimensec = XTIME_TO_NSEC(ei->e2di_atime_extra);
  143                 ip->i_mtimensec = XTIME_TO_NSEC(ei->e2di_mtime_extra);
  144                 ip->i_ctimensec = XTIME_TO_NSEC(ei->e2di_ctime_extra);
  145                 ip->i_birthtime = ei->e2di_crtime;
  146                 ip->i_birthnsec = XTIME_TO_NSEC(ei->e2di_crtime_extra);
  147         }
  148         ip->i_flags = 0;
  149         ip->i_flags |= (ei->e2di_flags & EXT2_APPEND) ? SF_APPEND : 0;
  150         ip->i_flags |= (ei->e2di_flags & EXT2_IMMUTABLE) ? SF_IMMUTABLE : 0;
  151         ip->i_flags |= (ei->e2di_flags & EXT2_NODUMP) ? UF_NODUMP : 0;
  152         ip->i_flag |= (ei->e2di_flags & EXT3_INDEX) ? IN_E3INDEX : 0;
  153         ip->i_flag |= (ei->e2di_flags & EXT4_EXTENTS) ? IN_E4EXTENTS : 0;
  154         ip->i_blocks = ei->e2di_nblock;
  155         ip->i_facl = ei->e2di_facl;
  156         if (E2DI_HAS_HUGE_FILE(ip)) {
  157                 ip->i_blocks |= (uint64_t)ei->e2di_nblock_high << 32;
  158                 ip->i_facl |= (uint64_t)ei->e2di_facl_high << 32;
  159                 if (ei->e2di_flags & EXT4_HUGE_FILE)
  160                         ip->i_blocks = fsbtodb(ip->i_e2fs, ip->i_blocks);
  161         }
  162         ip->i_gen = ei->e2di_gen;
  163         ip->i_uid = ei->e2di_uid;
  164         ip->i_gid = ei->e2di_gid;
  165         ip->i_uid |= (uint32_t)ei->e2di_uid_high << 16;
  166         ip->i_gid |= (uint32_t)ei->e2di_gid_high << 16;
  167 
  168         memcpy(ip->i_data, ei->e2di_blocks, sizeof(ei->e2di_blocks));
  169 
  170         /* Verify inode csum. */
  171         return (ext2_ei_csum_verify(ip, ei));
  172 }
  173 
  174 /*
  175  *      inode to raw ext2 inode
  176  */
  177 int
  178 ext2_i2ei(struct inode *ip, struct ext2fs_dinode *ei)
  179 {
  180         struct m_ext2fs *fs;
  181 
  182         fs = ip->i_e2fs;
  183         ei->e2di_mode = ip->i_mode;
  184         ei->e2di_nlink = ip->i_nlink;
  185         /*
  186          * Godmar thinks: if dtime is nonzero, ext2 says this inode has been
  187          * deleted, this would correspond to a zero link count
  188          */
  189         ei->e2di_dtime = ei->e2di_nlink ? 0 : ip->i_mtime;
  190         ei->e2di_size = ip->i_size;
  191         if (S_ISREG(ip->i_mode))
  192                 ei->e2di_size_high = ip->i_size >> 32;
  193         ei->e2di_atime = ip->i_atime;
  194         ei->e2di_mtime = ip->i_mtime;
  195         ei->e2di_ctime = ip->i_ctime;
  196         if (E2DI_HAS_XTIME(ip)) {
  197                 ei->e2di_ctime_extra = NSEC_TO_XTIME(ip->i_ctimensec);
  198                 ei->e2di_mtime_extra = NSEC_TO_XTIME(ip->i_mtimensec);
  199                 ei->e2di_atime_extra = NSEC_TO_XTIME(ip->i_atimensec);
  200                 ei->e2di_crtime = ip->i_birthtime;
  201                 ei->e2di_crtime_extra = NSEC_TO_XTIME(ip->i_birthnsec);
  202         }
  203         ei->e2di_flags = 0;
  204         ei->e2di_flags |= (ip->i_flags & SF_APPEND) ? EXT2_APPEND : 0;
  205         ei->e2di_flags |= (ip->i_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE : 0;
  206         ei->e2di_flags |= (ip->i_flags & UF_NODUMP) ? EXT2_NODUMP : 0;
  207         ei->e2di_flags |= (ip->i_flag & IN_E3INDEX) ? EXT3_INDEX : 0;
  208         ei->e2di_flags |= (ip->i_flag & IN_E4EXTENTS) ? EXT4_EXTENTS : 0;
  209         if (ip->i_blocks > ~0U &&
  210             !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_HUGE_FILE)) {
  211                 SDT_PROBE2(ext2fs, , trace, inode_cnv, 1, "i_blocks value is out of range");
  212                 return (EIO);
  213         }
  214         if (ip->i_blocks <= 0xffffffffffffULL) {
  215                 ei->e2di_nblock = ip->i_blocks & 0xffffffff;
  216                 ei->e2di_nblock_high = ip->i_blocks >> 32 & 0xffff;
  217         } else {
  218                 ei->e2di_flags |= EXT4_HUGE_FILE;
  219                 ei->e2di_nblock = dbtofsb(fs, ip->i_blocks);
  220                 ei->e2di_nblock_high = dbtofsb(fs, ip->i_blocks) >> 32 & 0xffff;
  221         }
  222         ei->e2di_facl = ip->i_facl & 0xffffffff;
  223         ei->e2di_facl_high = ip->i_facl >> 32 & 0xffff;
  224         ei->e2di_gen = ip->i_gen;
  225         ei->e2di_uid = ip->i_uid & 0xffff;
  226         ei->e2di_uid_high = ip->i_uid >> 16 & 0xffff;
  227         ei->e2di_gid = ip->i_gid & 0xffff;
  228         ei->e2di_gid_high = ip->i_gid >> 16 & 0xffff;
  229 
  230         memcpy(ei->e2di_blocks, ip->i_data, sizeof(ei->e2di_blocks));
  231 
  232         /* Set inode csum. */
  233         ext2_ei_csum_set(ip, ei);
  234 
  235         return (0);
  236 }

Cache object: d39ef96707a2927c5b154baf94d4dc44

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.

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

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