The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/fs/ext2fs/ext2_vfsops.c

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    1 /*-
    2  *  modified for EXT2FS support in Lites 1.1
    3  *
    4  *  Aug 1995, Godmar Back (gback@cs.utah.edu)
    5  *  University of Utah, Department of Computer Science
    6  */
    7 /*-
    8  * Copyright (c) 1989, 1991, 1993, 1994
    9  *      The Regents of the University of California.  All rights reserved.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 4. Neither the name of the University nor the names of its contributors
   20  *    may be used to endorse or promote products derived from this software
   21  *    without specific prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   33  * SUCH DAMAGE.
   34  *
   35  *      @(#)ffs_vfsops.c        8.8 (Berkeley) 4/18/94
   36  * $FreeBSD: releng/9.1/sys/fs/ext2fs/ext2_vfsops.c 235626 2012-05-18 19:48:38Z mckusick $
   37  */
   38 
   39 #include <sys/param.h>
   40 #include <sys/systm.h>
   41 #include <sys/namei.h>
   42 #include <sys/priv.h>
   43 #include <sys/proc.h>
   44 #include <sys/kernel.h>
   45 #include <sys/vnode.h>
   46 #include <sys/mount.h>
   47 #include <sys/bio.h>
   48 #include <sys/buf.h>
   49 #include <sys/conf.h>
   50 #include <sys/endian.h>
   51 #include <sys/fcntl.h>
   52 #include <sys/malloc.h>
   53 #include <sys/stat.h>
   54 #include <sys/mutex.h>
   55 
   56 #include <geom/geom.h>
   57 #include <geom/geom_vfs.h>
   58 
   59 #include <fs/ext2fs/ext2_mount.h>
   60 #include <fs/ext2fs/inode.h>
   61 
   62 #include <fs/ext2fs/fs.h>
   63 #include <fs/ext2fs/ext2fs.h>
   64 #include <fs/ext2fs/ext2_dinode.h>
   65 #include <fs/ext2fs/ext2_extern.h>
   66 
   67 static int      ext2_flushfiles(struct mount *mp, int flags, struct thread *td);
   68 static int      ext2_mountfs(struct vnode *, struct mount *);
   69 static int      ext2_reload(struct mount *mp, struct thread *td);
   70 static int      ext2_sbupdate(struct ext2mount *, int);
   71 static int      ext2_cgupdate(struct ext2mount *, int);
   72 static vfs_unmount_t            ext2_unmount;
   73 static vfs_root_t               ext2_root;
   74 static vfs_statfs_t             ext2_statfs;
   75 static vfs_sync_t               ext2_sync;
   76 static vfs_vget_t               ext2_vget;
   77 static vfs_fhtovp_t             ext2_fhtovp;
   78 static vfs_mount_t              ext2_mount;
   79 
   80 MALLOC_DEFINE(M_EXT2NODE, "ext2_node", "EXT2 vnode private part");
   81 static MALLOC_DEFINE(M_EXT2MNT, "ext2_mount", "EXT2 mount structure");
   82 
   83 static struct vfsops ext2fs_vfsops = {
   84         .vfs_fhtovp =           ext2_fhtovp,
   85         .vfs_mount =            ext2_mount,
   86         .vfs_root =             ext2_root,      /* root inode via vget */
   87         .vfs_statfs =           ext2_statfs,
   88         .vfs_sync =             ext2_sync,
   89         .vfs_unmount =          ext2_unmount,
   90         .vfs_vget =             ext2_vget,
   91 };
   92 
   93 VFS_SET(ext2fs_vfsops, ext2fs, 0);
   94 
   95 static int      ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev,
   96                     int ronly);
   97 static int      compute_sb_data(struct vnode * devvp,
   98                     struct ext2fs * es, struct m_ext2fs * fs);
   99 
  100 static const char *ext2_opts[] = { "acls", "async", "noatime", "noclusterr", 
  101     "noclusterw", "noexec", "export", "force", "from", "multilabel",
  102     "suiddir", "nosymfollow", "sync", "union", NULL };
  103 
  104 /*
  105  * VFS Operations.
  106  *
  107  * mount system call
  108  */
  109 static int
  110 ext2_mount(struct mount *mp)
  111 {
  112         struct vfsoptlist *opts;
  113         struct vnode *devvp;
  114         struct thread *td;
  115         struct ext2mount *ump = 0;
  116         struct m_ext2fs *fs;
  117         struct nameidata nd, *ndp = &nd;
  118         accmode_t accmode;
  119         char *path, *fspec;
  120         int error, flags, len;
  121 
  122         td = curthread;
  123         opts = mp->mnt_optnew;
  124 
  125         if (vfs_filteropt(opts, ext2_opts))
  126                 return (EINVAL);
  127 
  128         vfs_getopt(opts, "fspath", (void **)&path, NULL);
  129         /* Double-check the length of path.. */
  130         if (strlen(path) >= MAXMNTLEN - 1)
  131                 return (ENAMETOOLONG);
  132 
  133         fspec = NULL;
  134         error = vfs_getopt(opts, "from", (void **)&fspec, &len);
  135         if (!error && fspec[len - 1] != '\0')
  136                 return (EINVAL);
  137 
  138         /*
  139          * If updating, check whether changing from read-only to
  140          * read/write; if there is no device name, that's all we do.
  141          */
  142         if (mp->mnt_flag & MNT_UPDATE) {
  143                 ump = VFSTOEXT2(mp);
  144                 fs = ump->um_e2fs; 
  145                 error = 0;
  146                 if (fs->e2fs_ronly == 0 &&
  147                     vfs_flagopt(opts, "ro", NULL, 0)) {
  148                         error = VFS_SYNC(mp, MNT_WAIT);
  149                         if (error)
  150                                 return (error);
  151                         flags = WRITECLOSE;
  152                         if (mp->mnt_flag & MNT_FORCE)
  153                                 flags |= FORCECLOSE;
  154                         error = ext2_flushfiles(mp, flags, td);
  155                         if ( error == 0 && fs->e2fs_wasvalid && ext2_cgupdate(ump, MNT_WAIT) == 0) {
  156                                 fs->e2fs->e2fs_state |= E2FS_ISCLEAN;
  157                                 ext2_sbupdate(ump, MNT_WAIT);
  158                         }
  159                         fs->e2fs_ronly = 1;
  160                         vfs_flagopt(opts, "ro", &mp->mnt_flag, MNT_RDONLY);
  161                         DROP_GIANT();
  162                         g_topology_lock();
  163                         g_access(ump->um_cp, 0, -1, 0);
  164                         g_topology_unlock();
  165                         PICKUP_GIANT();
  166                 }
  167                 if (!error && (mp->mnt_flag & MNT_RELOAD))
  168                         error = ext2_reload(mp, td);
  169                 if (error)
  170                         return (error);
  171                 devvp = ump->um_devvp;
  172                 if (fs->e2fs_ronly && !vfs_flagopt(opts, "ro", NULL, 0)) {
  173                         if (ext2_check_sb_compat(fs->e2fs, devvp->v_rdev, 0))
  174                                 return (EPERM);
  175 
  176                         /*
  177                          * If upgrade to read-write by non-root, then verify
  178                          * that user has necessary permissions on the device.
  179                          */
  180                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
  181                         error = VOP_ACCESS(devvp, VREAD | VWRITE,
  182                             td->td_ucred, td);
  183                         if (error)
  184                                 error = priv_check(td, PRIV_VFS_MOUNT_PERM);
  185                         if (error) {
  186                                 VOP_UNLOCK(devvp, 0);
  187                                 return (error);
  188                         }
  189                         VOP_UNLOCK(devvp, 0);
  190                         DROP_GIANT();
  191                         g_topology_lock();
  192                         error = g_access(ump->um_cp, 0, 1, 0);
  193                         g_topology_unlock();
  194                         PICKUP_GIANT();
  195                         if (error)
  196                                 return (error);
  197 
  198                         if ((fs->e2fs->e2fs_state & E2FS_ISCLEAN) == 0 ||
  199                             (fs->e2fs->e2fs_state & E2FS_ERRORS)) {
  200                                 if (mp->mnt_flag & MNT_FORCE) {
  201                                         printf(
  202 "WARNING: %s was not properly dismounted\n", fs->e2fs_fsmnt);
  203                                 } else {
  204                                         printf(
  205 "WARNING: R/W mount of %s denied.  Filesystem is not clean - run fsck\n",
  206                                             fs->e2fs_fsmnt);
  207                                         return (EPERM);
  208                                 }
  209                         }
  210                         fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN;
  211                         (void)ext2_cgupdate(ump, MNT_WAIT);
  212                         fs->e2fs_ronly = 0;
  213                         MNT_ILOCK(mp);
  214                         mp->mnt_flag &= ~MNT_RDONLY;
  215                         MNT_IUNLOCK(mp);
  216                 }
  217                 if (vfs_flagopt(opts, "export", NULL, 0)) {
  218                         /* Process export requests in vfs_mount.c. */
  219                         return (error);
  220                 }
  221         }
  222 
  223         /*
  224          * Not an update, or updating the name: look up the name
  225          * and verify that it refers to a sensible disk device.
  226          */
  227         if (fspec == NULL)
  228                 return (EINVAL);
  229         NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td);
  230         if ((error = namei(ndp)) != 0)
  231                 return (error);
  232         NDFREE(ndp, NDF_ONLY_PNBUF);
  233         devvp = ndp->ni_vp;
  234 
  235         if (!vn_isdisk(devvp, &error)) {
  236                 vput(devvp);
  237                 return (error);
  238         }
  239 
  240         /*
  241          * If mount by non-root, then verify that user has necessary
  242          * permissions on the device.
  243          *
  244          * XXXRW: VOP_ACCESS() enough?
  245          */
  246         accmode = VREAD;
  247         if ((mp->mnt_flag & MNT_RDONLY) == 0)
  248                 accmode |= VWRITE;
  249         error = VOP_ACCESS(devvp, accmode, td->td_ucred, td);
  250         if (error)
  251                 error = priv_check(td, PRIV_VFS_MOUNT_PERM);
  252         if (error) {
  253                 vput(devvp);
  254                 return (error);
  255         }
  256 
  257         if ((mp->mnt_flag & MNT_UPDATE) == 0) {
  258                 error = ext2_mountfs(devvp, mp);
  259         } else {
  260                 if (devvp != ump->um_devvp) {
  261                         vput(devvp);
  262                         return (EINVAL);        /* needs translation */
  263                 } else
  264                         vput(devvp);
  265         }
  266         if (error) {
  267                 vrele(devvp);
  268                 return (error);
  269         }
  270         ump = VFSTOEXT2(mp);
  271         fs = ump->um_e2fs;
  272 
  273         /*
  274          * Note that this strncpy() is ok because of a check at the start
  275          * of ext2_mount().
  276          */
  277         strncpy(fs->e2fs_fsmnt, path, MAXMNTLEN);
  278         fs->e2fs_fsmnt[MAXMNTLEN - 1] = '\0';
  279         vfs_mountedfrom(mp, fspec);
  280         return (0);
  281 }
  282 
  283 static int
  284 ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev, int ronly)
  285 {
  286 
  287         if (es->e2fs_magic != E2FS_MAGIC) {
  288                 printf("ext2fs: %s: wrong magic number %#x (expected %#x)\n",
  289                     devtoname(dev), es->e2fs_magic, E2FS_MAGIC);
  290                 return (1);
  291         }
  292         if (es->e2fs_rev > E2FS_REV0) {
  293                 if (es->e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP) {
  294                         printf(
  295 "WARNING: mount of %s denied due to unsupported optional features\n",
  296                             devtoname(dev));
  297                         return (1);
  298                 }
  299                 if (!ronly &&
  300                     (es->e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP)) {
  301                         printf("WARNING: R/W mount of %s denied due to "
  302                             "unsupported optional features\n", devtoname(dev));
  303                         return (1);
  304                 }
  305         }
  306         return (0);
  307 }
  308 
  309 /*
  310  * This computes the fields of the  ext2_sb_info structure from the
  311  * data in the ext2_super_block structure read in.
  312  */
  313 static int
  314 compute_sb_data(struct vnode *devvp, struct ext2fs *es,
  315     struct m_ext2fs *fs)
  316 {
  317         int db_count, error;
  318         int i;
  319         int logic_sb_block = 1; /* XXX for now */
  320         struct buf *bp;
  321 
  322         fs->e2fs_bsize = EXT2_MIN_BLOCK_SIZE << es->e2fs_log_bsize;
  323         fs->e2fs_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->e2fs_log_bsize;
  324         fs->e2fs_fsbtodb = es->e2fs_log_bsize + 1;
  325         fs->e2fs_qbmask = fs->e2fs_bsize - 1;
  326         fs->e2fs_blocksize_bits = es->e2fs_log_bsize + 10;
  327         fs->e2fs_fsize = EXT2_MIN_FRAG_SIZE << es->e2fs_log_fsize;
  328         if (fs->e2fs_fsize)
  329                 fs->e2fs_fpb = fs->e2fs_bsize / fs->e2fs_fsize;
  330         fs->e2fs_bpg = es->e2fs_bpg;
  331         fs->e2fs_fpg = es->e2fs_fpg;
  332         fs->e2fs_ipg = es->e2fs_ipg;
  333         if (es->e2fs_rev == E2FS_REV0) {
  334                 fs->e2fs_first_inode = EXT2_FIRSTINO;
  335                 fs->e2fs_isize = E2FS_REV0_INODE_SIZE ;
  336         } else {
  337                 fs->e2fs_first_inode = es->e2fs_first_ino;
  338                 fs->e2fs_isize = es->e2fs_inode_size;
  339 
  340                 /*
  341                  * Simple sanity check for superblock inode size value.
  342                  */
  343                 if (EXT2_INODE_SIZE(fs) < E2FS_REV0_INODE_SIZE ||
  344                     EXT2_INODE_SIZE(fs) > fs->e2fs_bsize ||
  345                     (fs->e2fs_isize & (fs->e2fs_isize - 1)) != 0) {
  346                         printf("ext2fs: invalid inode size %d\n",
  347                             fs->e2fs_isize);
  348                         return (EIO);
  349                 }
  350         }
  351         /* Check for extra isize in big inodes. */
  352         if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT4F_ROCOMPAT_EXTRA_ISIZE) &&
  353             EXT2_INODE_SIZE(fs) < sizeof(struct ext2fs_dinode)) {
  354                 printf("ext2fs: no space for extra inode timestamps\n");
  355                 return (EINVAL);
  356         }
  357 
  358         fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs);
  359         fs->e2fs_itpg = fs->e2fs_ipg /fs->e2fs_ipb;
  360         fs->e2fs_descpb = fs->e2fs_bsize / sizeof(struct ext2_gd);
  361         /* s_resuid / s_resgid ? */
  362         fs->e2fs_gcount = (es->e2fs_bcount - es->e2fs_first_dblock +
  363             EXT2_BLOCKS_PER_GROUP(fs) - 1) / EXT2_BLOCKS_PER_GROUP(fs);
  364         db_count = (fs->e2fs_gcount + EXT2_DESC_PER_BLOCK(fs) - 1) /
  365             EXT2_DESC_PER_BLOCK(fs);
  366         fs->e2fs_gdbcount = db_count;
  367         fs->e2fs_gd = malloc(db_count * fs->e2fs_bsize,
  368             M_EXT2MNT, M_WAITOK);
  369         fs->e2fs_contigdirs = malloc(fs->e2fs_gcount *
  370             sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK);
  371 
  372         /*
  373          * Adjust logic_sb_block.
  374          * Godmar thinks: if the blocksize is greater than 1024, then
  375          * the superblock is logically part of block zero.
  376          */
  377         if(fs->e2fs_bsize > SBSIZE)
  378                 logic_sb_block = 0;
  379         for (i = 0; i < db_count; i++) {
  380                 error = bread(devvp ,
  381                          fsbtodb(fs, logic_sb_block + i + 1 ),
  382                         fs->e2fs_bsize, NOCRED, &bp);
  383                 if (error) {
  384                         free(fs->e2fs_gd, M_EXT2MNT);
  385                         brelse(bp);
  386                         return (error);
  387                 }
  388                 e2fs_cgload((struct ext2_gd *)bp->b_data,
  389                     &fs->e2fs_gd[
  390                         i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
  391                     fs->e2fs_bsize);
  392                 brelse(bp);
  393                 bp = NULL;
  394         }
  395         fs->e2fs_total_dir = 0;
  396         for (i=0; i < fs->e2fs_gcount; i++){
  397                 fs->e2fs_total_dir += fs->e2fs_gd[i].ext2bgd_ndirs;
  398                 fs->e2fs_contigdirs[i] = 0;
  399         }
  400         if (es->e2fs_rev == E2FS_REV0 ||
  401             !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE))
  402                 fs->e2fs_maxfilesize = 0x7fffffff;
  403         else
  404                 fs->e2fs_maxfilesize = 0x7fffffffffffffff;
  405         return (0);
  406 }
  407 
  408 /*
  409  * Reload all incore data for a filesystem (used after running fsck on
  410  * the root filesystem and finding things to fix). The filesystem must
  411  * be mounted read-only.
  412  *
  413  * Things to do to update the mount:
  414  *      1) invalidate all cached meta-data.
  415  *      2) re-read superblock from disk.
  416  *      3) invalidate all cluster summary information.
  417  *      4) invalidate all inactive vnodes.
  418  *      5) invalidate all cached file data.
  419  *      6) re-read inode data for all active vnodes.
  420  * XXX we are missing some steps, in particular # 3, this has to be reviewed.
  421  */
  422 static int
  423 ext2_reload(struct mount *mp, struct thread *td)
  424 {
  425         struct vnode *vp, *mvp, *devvp;
  426         struct inode *ip;
  427         struct buf *bp;
  428         struct ext2fs *es;
  429         struct m_ext2fs *fs;
  430         struct csum *sump;
  431         int error, i;
  432         int32_t *lp;
  433 
  434         if ((mp->mnt_flag & MNT_RDONLY) == 0)
  435                 return (EINVAL);
  436         /*
  437          * Step 1: invalidate all cached meta-data.
  438          */
  439         devvp = VFSTOEXT2(mp)->um_devvp;
  440         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
  441         if (vinvalbuf(devvp, 0, 0, 0) != 0)
  442                 panic("ext2_reload: dirty1");
  443         VOP_UNLOCK(devvp, 0);
  444 
  445         /*
  446          * Step 2: re-read superblock from disk.
  447          * constants have been adjusted for ext2
  448          */
  449         if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
  450                 return (error);
  451         es = (struct ext2fs *)bp->b_data;
  452         if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) {
  453                 brelse(bp);
  454                 return (EIO);           /* XXX needs translation */
  455         }
  456         fs = VFSTOEXT2(mp)->um_e2fs;
  457         bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs));
  458 
  459         if((error = compute_sb_data(devvp, es, fs)) != 0) {
  460                 brelse(bp);
  461                 return (error);
  462         }
  463 #ifdef UNKLAR
  464         if (fs->fs_sbsize < SBSIZE)
  465                 bp->b_flags |= B_INVAL;
  466 #endif
  467         brelse(bp);
  468 
  469         /*
  470          * Step 3: invalidate all cluster summary information.
  471          */
  472         if (fs->e2fs_contigsumsize > 0) {
  473                 lp = fs->e2fs_maxcluster;
  474                 sump = fs->e2fs_clustersum;
  475                 for (i = 0; i < fs->e2fs_gcount; i++, sump++) {
  476                         *lp++ = fs->e2fs_contigsumsize;
  477                         sump->cs_init = 0;
  478                         bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1);
  479                 }
  480         }
  481 
  482 loop:
  483         MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
  484                 /*
  485                  * Step 4: invalidate all cached file data.
  486                  */
  487                 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
  488                         MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
  489                         goto loop;
  490                 }
  491                 if (vinvalbuf(vp, 0, 0, 0))
  492                         panic("ext2_reload: dirty2");
  493 
  494                 /*
  495                  * Step 5: re-read inode data for all active vnodes.
  496                  */
  497                 ip = VTOI(vp);
  498                 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
  499                     (int)fs->e2fs_bsize, NOCRED, &bp);
  500                 if (error) {
  501                         VOP_UNLOCK(vp, 0);
  502                         vrele(vp);
  503                         MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
  504                         return (error);
  505                 }
  506                 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data +
  507                     EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip);
  508                 brelse(bp);
  509                 VOP_UNLOCK(vp, 0);
  510                 vrele(vp);
  511         }
  512         return (0);
  513 }
  514 
  515 /*
  516  * Common code for mount and mountroot.
  517  */
  518 static int
  519 ext2_mountfs(struct vnode *devvp, struct mount *mp)
  520 {
  521         struct ext2mount *ump;
  522         struct buf *bp;
  523         struct m_ext2fs *fs;
  524         struct ext2fs *es;
  525         struct cdev *dev = devvp->v_rdev;
  526         struct g_consumer *cp;
  527         struct bufobj *bo;
  528         struct csum *sump;
  529         int error;
  530         int ronly;
  531         int i, size;
  532         int32_t *lp;
  533 
  534         ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0);
  535         /* XXX: use VOP_ACESS to check FS perms */
  536         DROP_GIANT();
  537         g_topology_lock();
  538         error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1);
  539         g_topology_unlock();
  540         PICKUP_GIANT();
  541         VOP_UNLOCK(devvp, 0);
  542         if (error)
  543                 return (error);
  544 
  545         /* XXX: should we check for some sectorsize or 512 instead? */
  546         if (((SBSIZE % cp->provider->sectorsize) != 0) ||
  547             (SBSIZE < cp->provider->sectorsize)) {
  548                 DROP_GIANT();
  549                 g_topology_lock();
  550                 g_vfs_close(cp);
  551                 g_topology_unlock();
  552                 PICKUP_GIANT();
  553                 return (EINVAL);
  554         }
  555 
  556         bo = &devvp->v_bufobj;
  557         bo->bo_private = cp;
  558         bo->bo_ops = g_vfs_bufops;
  559         if (devvp->v_rdev->si_iosize_max != 0)
  560                 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
  561         if (mp->mnt_iosize_max > MAXPHYS)
  562                 mp->mnt_iosize_max = MAXPHYS;
  563 
  564         bp = NULL;
  565         ump = NULL;
  566         if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
  567                 goto out;
  568         es = (struct ext2fs *)bp->b_data;
  569         if (ext2_check_sb_compat(es, dev, ronly) != 0) {
  570                 error = EINVAL;         /* XXX needs translation */
  571                 goto out;
  572         }
  573         if ((es->e2fs_state & E2FS_ISCLEAN) == 0 ||
  574             (es->e2fs_state & E2FS_ERRORS)) {
  575                 if (ronly || (mp->mnt_flag & MNT_FORCE)) {
  576                         printf(
  577 "WARNING: Filesystem was not properly dismounted\n");
  578                 } else {
  579                         printf(
  580 "WARNING: R/W mount denied.  Filesystem is not clean - run fsck\n");
  581                         error = EPERM;
  582                         goto out;
  583                 }
  584         }
  585         ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO);
  586 
  587         /*
  588          * I don't know whether this is the right strategy. Note that
  589          * we dynamically allocate both an ext2_sb_info and an ext2_super_block
  590          * while Linux keeps the super block in a locked buffer.
  591          */
  592         ump->um_e2fs = malloc(sizeof(struct m_ext2fs),
  593                 M_EXT2MNT, M_WAITOK);
  594         ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs),
  595                 M_EXT2MNT, M_WAITOK);
  596         mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF);
  597         bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs));
  598         if ((error = compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs)))
  599                 goto out;
  600 
  601         /*
  602          * Calculate the maximum contiguous blocks and size of cluster summary
  603          * array.  In FFS this is done by newfs; however, the superblock 
  604          * in ext2fs doesn't have these variables, so we can calculate 
  605          * them here.
  606          */
  607         ump->um_e2fs->e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize);
  608         if (ump->um_e2fs->e2fs_maxcontig > 0)
  609                 ump->um_e2fs->e2fs_contigsumsize =
  610                     MIN(ump->um_e2fs->e2fs_maxcontig, EXT2_MAXCONTIG);
  611         else
  612                 ump->um_e2fs->e2fs_contigsumsize = 0;
  613         if (ump->um_e2fs->e2fs_contigsumsize > 0) {
  614                 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t);
  615                 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK);
  616                 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum);
  617                 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK);
  618                 lp = ump->um_e2fs->e2fs_maxcluster;
  619                 sump = ump->um_e2fs->e2fs_clustersum;
  620                 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) {
  621                         *lp++ = ump->um_e2fs->e2fs_contigsumsize;
  622                         sump->cs_init = 0;
  623                         sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) *
  624                             sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO);
  625                 }
  626         }
  627 
  628         brelse(bp);
  629         bp = NULL;
  630         fs = ump->um_e2fs;
  631         fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */
  632 
  633         /*
  634          * If the fs is not mounted read-only, make sure the super block is
  635          * always written back on a sync().
  636          */
  637         fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0;
  638         if (ronly == 0) {
  639                 fs->e2fs_fmod = 1;              /* mark it modified */
  640                 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN;  /* set fs invalid */
  641         }
  642         mp->mnt_data = ump;
  643         mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
  644         mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
  645         mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
  646         MNT_ILOCK(mp);
  647         mp->mnt_flag |= MNT_LOCAL;
  648         MNT_IUNLOCK(mp);
  649         ump->um_mountp = mp;
  650         ump->um_dev = dev;
  651         ump->um_devvp = devvp;
  652         ump->um_bo = &devvp->v_bufobj;
  653         ump->um_cp = cp;
  654 
  655         /*
  656          * Setting those two parameters allowed us to use
  657          * ufs_bmap w/o changse!
  658          */
  659         ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
  660         ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1;
  661         ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
  662         if (ronly == 0)
  663                 ext2_sbupdate(ump, MNT_WAIT);
  664         /*
  665          * Initialize filesystem stat information in mount struct.
  666          */
  667         MNT_ILOCK(mp);
  668         mp->mnt_kern_flag |= MNTK_MPSAFE | MNTK_LOOKUP_SHARED |
  669             MNTK_EXTENDED_SHARED;
  670         MNT_IUNLOCK(mp);
  671         return (0);
  672 out:
  673         if (bp)
  674                 brelse(bp);
  675         if (cp != NULL) {
  676                 DROP_GIANT();
  677                 g_topology_lock();
  678                 g_vfs_close(cp);
  679                 g_topology_unlock();
  680                 PICKUP_GIANT();
  681         }
  682         if (ump) {
  683                 mtx_destroy(EXT2_MTX(ump));
  684                 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT);
  685                 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT);
  686                 free(ump->um_e2fs->e2fs, M_EXT2MNT);
  687                 free(ump->um_e2fs, M_EXT2MNT);
  688                 free(ump, M_EXT2MNT);
  689                 mp->mnt_data = NULL;
  690         }
  691         return (error);
  692 }
  693 
  694 /*
  695  * Unmount system call.
  696  */
  697 static int
  698 ext2_unmount(struct mount *mp, int mntflags)
  699 {
  700         struct ext2mount *ump;
  701         struct m_ext2fs *fs;
  702         struct csum *sump;
  703         int error, flags, i, ronly;
  704 
  705         flags = 0;
  706         if (mntflags & MNT_FORCE) {
  707                 if (mp->mnt_flag & MNT_ROOTFS)
  708                         return (EINVAL);
  709                 flags |= FORCECLOSE;
  710         }
  711         if ((error = ext2_flushfiles(mp, flags, curthread)) != 0)
  712                 return (error);
  713         ump = VFSTOEXT2(mp);
  714         fs = ump->um_e2fs;
  715         ronly = fs->e2fs_ronly;
  716         if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) {
  717                 if (fs->e2fs_wasvalid)
  718                         fs->e2fs->e2fs_state |= E2FS_ISCLEAN;
  719                 ext2_sbupdate(ump, MNT_WAIT);
  720         }
  721 
  722         DROP_GIANT();
  723         g_topology_lock();
  724         g_vfs_close(ump->um_cp);
  725         g_topology_unlock();
  726         PICKUP_GIANT();
  727         vrele(ump->um_devvp);
  728         sump = fs->e2fs_clustersum;
  729         for (i = 0; i < fs->e2fs_gcount; i++, sump++)
  730                 free(sump->cs_sum, M_EXT2MNT);
  731         free(fs->e2fs_clustersum, M_EXT2MNT);
  732         free(fs->e2fs_maxcluster, M_EXT2MNT);
  733         free(fs->e2fs_gd, M_EXT2MNT);
  734         free(fs->e2fs_contigdirs, M_EXT2MNT);
  735         free(fs->e2fs, M_EXT2MNT);
  736         free(fs, M_EXT2MNT);
  737         free(ump, M_EXT2MNT);
  738         mp->mnt_data = NULL;
  739         MNT_ILOCK(mp);
  740         mp->mnt_flag &= ~MNT_LOCAL;
  741         MNT_IUNLOCK(mp);
  742         return (error);
  743 }
  744 
  745 /*
  746  * Flush out all the files in a filesystem.
  747  */
  748 static int
  749 ext2_flushfiles(struct mount *mp, int flags, struct thread *td)
  750 {
  751         int error;
  752 
  753         error = vflush(mp, 0, flags, td);
  754         return (error);
  755 }
  756 /*
  757  * Get file system statistics.
  758  */
  759 int
  760 ext2_statfs(struct mount *mp, struct statfs *sbp)
  761 {
  762         struct ext2mount *ump;
  763         struct m_ext2fs *fs;
  764         uint32_t overhead, overhead_per_group, ngdb;
  765         int i, ngroups;
  766 
  767         ump = VFSTOEXT2(mp);
  768         fs = ump->um_e2fs;
  769         if (fs->e2fs->e2fs_magic != E2FS_MAGIC)
  770                 panic("ext2fs_statvfs");
  771 
  772         /*
  773          * Compute the overhead (FS structures)
  774          */
  775         overhead_per_group =
  776             1 /* block bitmap */ +
  777             1 /* inode bitmap */ +
  778             fs->e2fs_itpg;
  779         overhead = fs->e2fs->e2fs_first_dblock +
  780             fs->e2fs_gcount * overhead_per_group;
  781         if (fs->e2fs->e2fs_rev > E2FS_REV0 &&
  782             fs->e2fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) {
  783                 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) {
  784                         if (cg_has_sb(i))
  785                                 ngroups++;
  786                 }
  787         } else {
  788                 ngroups = fs->e2fs_gcount;
  789         }
  790         ngdb = fs->e2fs_gdbcount;
  791         if (fs->e2fs->e2fs_rev > E2FS_REV0 &&
  792             fs->e2fs->e2fs_features_compat & EXT2F_COMPAT_RESIZE)
  793                 ngdb += fs->e2fs->e2fs_reserved_ngdb;
  794         overhead += ngroups * (1 /* superblock */ + ngdb);
  795 
  796         sbp->f_bsize = EXT2_FRAG_SIZE(fs);
  797         sbp->f_iosize = EXT2_BLOCK_SIZE(fs);
  798         sbp->f_blocks = fs->e2fs->e2fs_bcount - overhead;
  799         sbp->f_bfree = fs->e2fs->e2fs_fbcount;
  800         sbp->f_bavail = sbp->f_bfree - fs->e2fs->e2fs_rbcount;
  801         sbp->f_files = fs->e2fs->e2fs_icount;
  802         sbp->f_ffree = fs->e2fs->e2fs_ficount;
  803         return (0);
  804 }
  805 
  806 /*
  807  * Go through the disk queues to initiate sandbagged IO;
  808  * go through the inodes to write those that have been modified;
  809  * initiate the writing of the super block if it has been modified.
  810  *
  811  * Note: we are always called with the filesystem marked `MPBUSY'.
  812  */
  813 static int
  814 ext2_sync(struct mount *mp, int waitfor)
  815 {
  816         struct vnode *mvp, *vp;
  817         struct thread *td;
  818         struct inode *ip;
  819         struct ext2mount *ump = VFSTOEXT2(mp);
  820         struct m_ext2fs *fs;
  821         int error, allerror = 0;
  822 
  823         td = curthread;
  824         fs = ump->um_e2fs;
  825         if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) {                /* XXX */
  826                 printf("fs = %s\n", fs->e2fs_fsmnt);
  827                 panic("ext2_sync: rofs mod");
  828         }
  829 
  830         /*
  831          * Write back each (modified) inode.
  832          */
  833 loop:
  834         MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
  835                 if (vp->v_type == VNON) {
  836                         VI_UNLOCK(vp);
  837                         continue;
  838                 }
  839                 ip = VTOI(vp);
  840                 if ((ip->i_flag &
  841                     (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
  842                     (vp->v_bufobj.bo_dirty.bv_cnt == 0 ||
  843                     waitfor == MNT_LAZY)) {
  844                         VI_UNLOCK(vp);
  845                         continue;
  846                 }
  847                 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td);
  848                 if (error) {
  849                         if (error == ENOENT) {
  850                                 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
  851                                 goto loop;
  852                         }
  853                         continue;
  854                 }
  855                 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0)
  856                         allerror = error;
  857                 VOP_UNLOCK(vp, 0);
  858                 vrele(vp);
  859         }
  860 
  861         /*
  862          * Force stale file system control information to be flushed.
  863          */
  864         if (waitfor != MNT_LAZY) {
  865                 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
  866                 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0)
  867                         allerror = error;
  868                 VOP_UNLOCK(ump->um_devvp, 0);
  869         }
  870 
  871         /*
  872          * Write back modified superblock.
  873          */
  874         if (fs->e2fs_fmod != 0) {
  875                 fs->e2fs_fmod = 0;
  876                 fs->e2fs->e2fs_wtime = time_second;
  877                 if ((error = ext2_cgupdate(ump, waitfor)) != 0)
  878                         allerror = error;
  879         }
  880         return (allerror);
  881 }
  882 
  883 /*
  884  * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it
  885  * in from disk.  If it is in core, wait for the lock bit to clear, then
  886  * return the inode locked.  Detection and handling of mount points must be
  887  * done by the calling routine.
  888  */
  889 static int
  890 ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
  891 {
  892         struct m_ext2fs *fs;
  893         struct inode *ip;
  894         struct ext2mount *ump;
  895         struct buf *bp;
  896         struct vnode *vp;
  897         struct cdev *dev;
  898         struct thread *td;
  899         int i, error;
  900         int used_blocks;
  901 
  902         td = curthread;
  903         error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL);
  904         if (error || *vpp != NULL)
  905                 return (error);
  906 
  907         ump = VFSTOEXT2(mp);
  908         dev = ump->um_dev;
  909 
  910         /*
  911          * If this malloc() is performed after the getnewvnode()
  912          * it might block, leaving a vnode with a NULL v_data to be
  913          * found by ext2_sync() if a sync happens to fire right then,
  914          * which will cause a panic because ext2_sync() blindly
  915          * dereferences vp->v_data (as well it should).
  916          */
  917         ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO);
  918 
  919         /* Allocate a new vnode/inode. */
  920         if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) {
  921                 *vpp = NULL;
  922                 free(ip, M_EXT2NODE);
  923                 return (error);
  924         }
  925         vp->v_data = ip;
  926         ip->i_vnode = vp;
  927         ip->i_e2fs = fs = ump->um_e2fs;
  928         ip->i_ump  = ump;
  929         ip->i_number = ino;
  930 
  931         lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
  932         error = insmntque(vp, mp);
  933         if (error != 0) {
  934                 free(ip, M_EXT2NODE);
  935                 *vpp = NULL;
  936                 return (error);
  937         }
  938         error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL);
  939         if (error || *vpp != NULL)
  940                 return (error);
  941 
  942         /* Read in the disk contents for the inode, copy into the inode. */
  943         if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
  944             (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) {
  945                 /*
  946                  * The inode does not contain anything useful, so it would
  947                  * be misleading to leave it on its hash chain. With mode
  948                  * still zero, it will be unlinked and returned to the free
  949                  * list by vput().
  950                  */
  951                 brelse(bp);
  952                 vput(vp);
  953                 *vpp = NULL;
  954                 return (error);
  955         }
  956         /* convert ext2 inode to dinode */
  957         ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data + EXT2_INODE_SIZE(fs) *
  958                         ino_to_fsbo(fs, ino)), ip);
  959         ip->i_block_group = ino_to_cg(fs, ino);
  960         ip->i_next_alloc_block = 0;
  961         ip->i_next_alloc_goal = 0;
  962 
  963         /*
  964          * Now we want to make sure that block pointers for unused
  965          * blocks are zeroed out - ext2_balloc depends on this
  966          * although for regular files and directories only
  967          */
  968         if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) {
  969                 used_blocks = (ip->i_size+fs->e2fs_bsize-1) / fs->e2fs_bsize;
  970                 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
  971                         ip->i_db[i] = 0;
  972         }
  973 /*
  974         ext2_print_inode(ip);
  975 */
  976         bqrelse(bp);
  977 
  978         /*
  979          * Initialize the vnode from the inode, check for aliases.
  980          * Note that the underlying vnode may have changed.
  981          */
  982         if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) {
  983                 vput(vp);
  984                 *vpp = NULL;
  985                 return (error);
  986         }
  987 
  988         /*
  989          * Finish inode initialization.
  990          */
  991 
  992         /*
  993          * Set up a generation number for this inode if it does not
  994          * already have one. This should only happen on old filesystems.
  995          */
  996         if (ip->i_gen == 0) {
  997                 ip->i_gen = random() / 2 + 1;
  998                 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
  999                         ip->i_flag |= IN_MODIFIED;
 1000         }
 1001         *vpp = vp;
 1002         return (0);
 1003 }
 1004 
 1005 /*
 1006  * File handle to vnode
 1007  *
 1008  * Have to be really careful about stale file handles:
 1009  * - check that the inode number is valid
 1010  * - call ext2_vget() to get the locked inode
 1011  * - check for an unallocated inode (i_mode == 0)
 1012  * - check that the given client host has export rights and return
 1013  *   those rights via. exflagsp and credanonp
 1014  */
 1015 static int
 1016 ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp)
 1017 {
 1018         struct inode *ip;
 1019         struct ufid *ufhp;
 1020         struct vnode *nvp;
 1021         struct m_ext2fs *fs;
 1022         int error;
 1023 
 1024         ufhp = (struct ufid *)fhp;
 1025         fs = VFSTOEXT2(mp)->um_e2fs;
 1026         if (ufhp->ufid_ino < EXT2_ROOTINO ||
 1027             ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg)
 1028                 return (ESTALE);
 1029 
 1030         error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
 1031         if (error) {
 1032                 *vpp = NULLVP;
 1033                 return (error);
 1034         }
 1035         ip = VTOI(nvp);
 1036         if (ip->i_mode == 0 ||
 1037             ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) {
 1038                 vput(nvp);
 1039                 *vpp = NULLVP;
 1040                 return (ESTALE);
 1041         }
 1042         *vpp = nvp;
 1043         vnode_create_vobject(*vpp, 0, curthread);
 1044         return (0);
 1045 }
 1046 
 1047 /*
 1048  * Write a superblock and associated information back to disk.
 1049  */
 1050 static int
 1051 ext2_sbupdate(struct ext2mount *mp, int waitfor)
 1052 {
 1053         struct m_ext2fs *fs = mp->um_e2fs;
 1054         struct ext2fs *es = fs->e2fs;
 1055         struct buf *bp;
 1056         int error = 0;
 1057 
 1058         bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0);
 1059         bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs));
 1060         if (waitfor == MNT_WAIT)
 1061                 error = bwrite(bp);
 1062         else
 1063                 bawrite(bp);
 1064 
 1065         /*
 1066          * The buffers for group descriptors, inode bitmaps and block bitmaps
 1067          * are not busy at this point and are (hopefully) written by the
 1068          * usual sync mechanism. No need to write them here.
 1069          */
 1070         return (error);
 1071 }
 1072 int
 1073 ext2_cgupdate(struct ext2mount *mp, int waitfor)
 1074 {
 1075         struct m_ext2fs *fs = mp->um_e2fs;
 1076         struct buf *bp;
 1077         int i, error = 0, allerror = 0;
 1078 
 1079         allerror = ext2_sbupdate(mp, waitfor);
 1080         for (i = 0; i < fs->e2fs_gdbcount; i++) {
 1081                 bp = getblk(mp->um_devvp, fsbtodb(fs,
 1082                     fs->e2fs->e2fs_first_dblock +
 1083                     1 /* superblock */ + i), fs->e2fs_bsize, 0, 0, 0);
 1084                 e2fs_cgsave(&fs->e2fs_gd[
 1085                     i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
 1086                     (struct ext2_gd *)bp->b_data, fs->e2fs_bsize);
 1087                 if (waitfor == MNT_WAIT)
 1088                         error = bwrite(bp);
 1089                 else
 1090                         bawrite(bp);
 1091         }
 1092 
 1093         if (!allerror && error)
 1094                 allerror = error;
 1095         return (allerror);
 1096 }
 1097 /*
 1098  * Return the root of a filesystem.
 1099  */
 1100 static int
 1101 ext2_root(struct mount *mp, int flags, struct vnode **vpp)
 1102 {
 1103         struct vnode *nvp;
 1104         int error;
 1105 
 1106         error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp);
 1107         if (error)
 1108                 return (error);
 1109         *vpp = nvp;
 1110         return (0);
 1111 }

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