The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
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/10.0/sys/fs/ext2fs/ext2_vfsops.c 254260 2013-08-12 21:34:48Z pfg $
   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 = NULL;
  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)
  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         uint32_t e2fs_descpb;
  322 
  323         fs->e2fs_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->e2fs_log_bsize;
  324         fs->e2fs_bsize = 1U << fs->e2fs_bshift;
  325         fs->e2fs_fsbtodb = es->e2fs_log_bsize + 1;
  326         fs->e2fs_qbmask = fs->e2fs_bsize - 1;
  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_isize = E2FS_REV0_INODE_SIZE ;
  335         } else {
  336                 fs->e2fs_isize = es->e2fs_inode_size;
  337 
  338                 /*
  339                  * Simple sanity check for superblock inode size value.
  340                  */
  341                 if (EXT2_INODE_SIZE(fs) < E2FS_REV0_INODE_SIZE ||
  342                     EXT2_INODE_SIZE(fs) > fs->e2fs_bsize ||
  343                     (fs->e2fs_isize & (fs->e2fs_isize - 1)) != 0) {
  344                         printf("ext2fs: invalid inode size %d\n",
  345                             fs->e2fs_isize);
  346                         return (EIO);
  347                 }
  348         }
  349         /* Check for extra isize in big inodes. */
  350         if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_EXTRA_ISIZE) &&
  351             EXT2_INODE_SIZE(fs) < sizeof(struct ext2fs_dinode)) {
  352                 printf("ext2fs: no space for extra inode timestamps\n");
  353                 return (EINVAL);
  354         }
  355 
  356         fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs);
  357         fs->e2fs_itpg = fs->e2fs_ipg /fs->e2fs_ipb;
  358         /* s_resuid / s_resgid ? */
  359         fs->e2fs_gcount = (es->e2fs_bcount - es->e2fs_first_dblock +
  360             EXT2_BLOCKS_PER_GROUP(fs) - 1) / EXT2_BLOCKS_PER_GROUP(fs);
  361         e2fs_descpb = fs->e2fs_bsize / sizeof(struct ext2_gd);
  362         db_count = (fs->e2fs_gcount + e2fs_descpb - 1) / e2fs_descpb;
  363         fs->e2fs_gdbcount = db_count;
  364         fs->e2fs_gd = malloc(db_count * fs->e2fs_bsize,
  365             M_EXT2MNT, M_WAITOK);
  366         fs->e2fs_contigdirs = malloc(fs->e2fs_gcount *
  367             sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK);
  368 
  369         /*
  370          * Adjust logic_sb_block.
  371          * Godmar thinks: if the blocksize is greater than 1024, then
  372          * the superblock is logically part of block zero.
  373          */
  374         if(fs->e2fs_bsize > SBSIZE)
  375                 logic_sb_block = 0;
  376         for (i = 0; i < db_count; i++) {
  377                 error = bread(devvp ,
  378                          fsbtodb(fs, logic_sb_block + i + 1 ),
  379                         fs->e2fs_bsize, NOCRED, &bp);
  380                 if (error) {
  381                         free(fs->e2fs_gd, M_EXT2MNT);
  382                         brelse(bp);
  383                         return (error);
  384                 }
  385                 e2fs_cgload((struct ext2_gd *)bp->b_data,
  386                     &fs->e2fs_gd[
  387                         i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
  388                     fs->e2fs_bsize);
  389                 brelse(bp);
  390                 bp = NULL;
  391         }
  392         fs->e2fs_total_dir = 0;
  393         for (i=0; i < fs->e2fs_gcount; i++){
  394                 fs->e2fs_total_dir += fs->e2fs_gd[i].ext2bgd_ndirs;
  395                 fs->e2fs_contigdirs[i] = 0;
  396         }
  397         if (es->e2fs_rev == E2FS_REV0 ||
  398             !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE))
  399                 fs->e2fs_maxfilesize = 0x7fffffff;
  400         else {
  401                 fs->e2fs_maxfilesize = 0xffffffffffff;
  402                 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_HUGE_FILE))
  403                         fs->e2fs_maxfilesize = 0x7fffffffffffffff;
  404         }
  405         if (es->e4fs_flags & E2FS_UNSIGNED_HASH) {
  406                 fs->e2fs_uhash = 3;
  407         } else if ((es->e4fs_flags & E2FS_SIGNED_HASH) == 0) {
  408 #ifdef __CHAR_UNSIGNED__
  409                 es->e4fs_flags |= E2FS_UNSIGNED_HASH;
  410                 fs->e2fs_uhash = 3;
  411 #else
  412                 es->e4fs_flags |= E2FS_SIGNED_HASH;
  413 #endif
  414         }
  415 
  416         return (0);
  417 }
  418 
  419 /*
  420  * Reload all incore data for a filesystem (used after running fsck on
  421  * the root filesystem and finding things to fix). The filesystem must
  422  * be mounted read-only.
  423  *
  424  * Things to do to update the mount:
  425  *      1) invalidate all cached meta-data.
  426  *      2) re-read superblock from disk.
  427  *      3) invalidate all cluster summary information.
  428  *      4) invalidate all inactive vnodes.
  429  *      5) invalidate all cached file data.
  430  *      6) re-read inode data for all active vnodes.
  431  * XXX we are missing some steps, in particular # 3, this has to be reviewed.
  432  */
  433 static int
  434 ext2_reload(struct mount *mp, struct thread *td)
  435 {
  436         struct vnode *vp, *mvp, *devvp;
  437         struct inode *ip;
  438         struct buf *bp;
  439         struct ext2fs *es;
  440         struct m_ext2fs *fs;
  441         struct csum *sump;
  442         int error, i;
  443         int32_t *lp;
  444 
  445         if ((mp->mnt_flag & MNT_RDONLY) == 0)
  446                 return (EINVAL);
  447         /*
  448          * Step 1: invalidate all cached meta-data.
  449          */
  450         devvp = VFSTOEXT2(mp)->um_devvp;
  451         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
  452         if (vinvalbuf(devvp, 0, 0, 0) != 0)
  453                 panic("ext2_reload: dirty1");
  454         VOP_UNLOCK(devvp, 0);
  455 
  456         /*
  457          * Step 2: re-read superblock from disk.
  458          * constants have been adjusted for ext2
  459          */
  460         if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
  461                 return (error);
  462         es = (struct ext2fs *)bp->b_data;
  463         if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) {
  464                 brelse(bp);
  465                 return (EIO);           /* XXX needs translation */
  466         }
  467         fs = VFSTOEXT2(mp)->um_e2fs;
  468         bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs));
  469 
  470         if((error = compute_sb_data(devvp, es, fs)) != 0) {
  471                 brelse(bp);
  472                 return (error);
  473         }
  474 #ifdef UNKLAR
  475         if (fs->fs_sbsize < SBSIZE)
  476                 bp->b_flags |= B_INVAL;
  477 #endif
  478         brelse(bp);
  479 
  480         /*
  481          * Step 3: invalidate all cluster summary information.
  482          */
  483         if (fs->e2fs_contigsumsize > 0) {
  484                 lp = fs->e2fs_maxcluster;
  485                 sump = fs->e2fs_clustersum;
  486                 for (i = 0; i < fs->e2fs_gcount; i++, sump++) {
  487                         *lp++ = fs->e2fs_contigsumsize;
  488                         sump->cs_init = 0;
  489                         bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1);
  490                 }
  491         }
  492 
  493 loop:
  494         MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
  495                 /*
  496                  * Step 4: invalidate all cached file data.
  497                  */
  498                 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
  499                         MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
  500                         goto loop;
  501                 }
  502                 if (vinvalbuf(vp, 0, 0, 0))
  503                         panic("ext2_reload: dirty2");
  504 
  505                 /*
  506                  * Step 5: re-read inode data for all active vnodes.
  507                  */
  508                 ip = VTOI(vp);
  509                 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
  510                     (int)fs->e2fs_bsize, NOCRED, &bp);
  511                 if (error) {
  512                         VOP_UNLOCK(vp, 0);
  513                         vrele(vp);
  514                         MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
  515                         return (error);
  516                 }
  517                 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data +
  518                     EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip);
  519                 brelse(bp);
  520                 VOP_UNLOCK(vp, 0);
  521                 vrele(vp);
  522         }
  523         return (0);
  524 }
  525 
  526 /*
  527  * Common code for mount and mountroot.
  528  */
  529 static int
  530 ext2_mountfs(struct vnode *devvp, struct mount *mp)
  531 {
  532         struct ext2mount *ump;
  533         struct buf *bp;
  534         struct m_ext2fs *fs;
  535         struct ext2fs *es;
  536         struct cdev *dev = devvp->v_rdev;
  537         struct g_consumer *cp;
  538         struct bufobj *bo;
  539         struct csum *sump;
  540         int error;
  541         int ronly;
  542         int i, size;
  543         int32_t *lp;
  544         int32_t e2fs_maxcontig;
  545 
  546         ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0);
  547         /* XXX: use VOP_ACESS to check FS perms */
  548         DROP_GIANT();
  549         g_topology_lock();
  550         error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1);
  551         g_topology_unlock();
  552         PICKUP_GIANT();
  553         VOP_UNLOCK(devvp, 0);
  554         if (error)
  555                 return (error);
  556 
  557         /* XXX: should we check for some sectorsize or 512 instead? */
  558         if (((SBSIZE % cp->provider->sectorsize) != 0) ||
  559             (SBSIZE < cp->provider->sectorsize)) {
  560                 DROP_GIANT();
  561                 g_topology_lock();
  562                 g_vfs_close(cp);
  563                 g_topology_unlock();
  564                 PICKUP_GIANT();
  565                 return (EINVAL);
  566         }
  567 
  568         bo = &devvp->v_bufobj;
  569         bo->bo_private = cp;
  570         bo->bo_ops = g_vfs_bufops;
  571         if (devvp->v_rdev->si_iosize_max != 0)
  572                 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
  573         if (mp->mnt_iosize_max > MAXPHYS)
  574                 mp->mnt_iosize_max = MAXPHYS;
  575 
  576         bp = NULL;
  577         ump = NULL;
  578         if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
  579                 goto out;
  580         es = (struct ext2fs *)bp->b_data;
  581         if (ext2_check_sb_compat(es, dev, ronly) != 0) {
  582                 error = EINVAL;         /* XXX needs translation */
  583                 goto out;
  584         }
  585         if ((es->e2fs_state & E2FS_ISCLEAN) == 0 ||
  586             (es->e2fs_state & E2FS_ERRORS)) {
  587                 if (ronly || (mp->mnt_flag & MNT_FORCE)) {
  588                         printf(
  589 "WARNING: Filesystem was not properly dismounted\n");
  590                 } else {
  591                         printf(
  592 "WARNING: R/W mount denied.  Filesystem is not clean - run fsck\n");
  593                         error = EPERM;
  594                         goto out;
  595                 }
  596         }
  597         ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO);
  598 
  599         /*
  600          * I don't know whether this is the right strategy. Note that
  601          * we dynamically allocate both an ext2_sb_info and an ext2_super_block
  602          * while Linux keeps the super block in a locked buffer.
  603          */
  604         ump->um_e2fs = malloc(sizeof(struct m_ext2fs),
  605                 M_EXT2MNT, M_WAITOK);
  606         ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs),
  607                 M_EXT2MNT, M_WAITOK);
  608         mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF);
  609         bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs));
  610         if ((error = compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs)))
  611                 goto out;
  612 
  613         /*
  614          * Calculate the maximum contiguous blocks and size of cluster summary
  615          * array.  In FFS this is done by newfs; however, the superblock 
  616          * in ext2fs doesn't have these variables, so we can calculate 
  617          * them here.
  618          */
  619         e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize);
  620         ump->um_e2fs->e2fs_contigsumsize = MIN(e2fs_maxcontig, EXT2_MAXCONTIG);
  621         if (ump->um_e2fs->e2fs_contigsumsize > 0) {
  622                 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t);
  623                 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK);
  624                 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum);
  625                 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK);
  626                 lp = ump->um_e2fs->e2fs_maxcluster;
  627                 sump = ump->um_e2fs->e2fs_clustersum;
  628                 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) {
  629                         *lp++ = ump->um_e2fs->e2fs_contigsumsize;
  630                         sump->cs_init = 0;
  631                         sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) *
  632                             sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO);
  633                 }
  634         }
  635 
  636         brelse(bp);
  637         bp = NULL;
  638         fs = ump->um_e2fs;
  639         fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */
  640 
  641         /*
  642          * If the fs is not mounted read-only, make sure the super block is
  643          * always written back on a sync().
  644          */
  645         fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0;
  646         if (ronly == 0) {
  647                 fs->e2fs_fmod = 1;              /* mark it modified */
  648                 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN;  /* set fs invalid */
  649         }
  650         mp->mnt_data = ump;
  651         mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
  652         mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
  653         mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
  654         MNT_ILOCK(mp);
  655         mp->mnt_flag |= MNT_LOCAL;
  656         MNT_IUNLOCK(mp);
  657         ump->um_mountp = mp;
  658         ump->um_dev = dev;
  659         ump->um_devvp = devvp;
  660         ump->um_bo = &devvp->v_bufobj;
  661         ump->um_cp = cp;
  662 
  663         /*
  664          * Setting those two parameters allowed us to use
  665          * ufs_bmap w/o changse!
  666          */
  667         ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
  668         ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1;
  669         ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
  670         if (ronly == 0)
  671                 ext2_sbupdate(ump, MNT_WAIT);
  672         /*
  673          * Initialize filesystem stat information in mount struct.
  674          */
  675         MNT_ILOCK(mp);
  676         mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED;
  677         MNT_IUNLOCK(mp);
  678         return (0);
  679 out:
  680         if (bp)
  681                 brelse(bp);
  682         if (cp != NULL) {
  683                 DROP_GIANT();
  684                 g_topology_lock();
  685                 g_vfs_close(cp);
  686                 g_topology_unlock();
  687                 PICKUP_GIANT();
  688         }
  689         if (ump) {
  690                 mtx_destroy(EXT2_MTX(ump));
  691                 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT);
  692                 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT);
  693                 free(ump->um_e2fs->e2fs, M_EXT2MNT);
  694                 free(ump->um_e2fs, M_EXT2MNT);
  695                 free(ump, M_EXT2MNT);
  696                 mp->mnt_data = NULL;
  697         }
  698         return (error);
  699 }
  700 
  701 /*
  702  * Unmount system call.
  703  */
  704 static int
  705 ext2_unmount(struct mount *mp, int mntflags)
  706 {
  707         struct ext2mount *ump;
  708         struct m_ext2fs *fs;
  709         struct csum *sump;
  710         int error, flags, i, ronly;
  711 
  712         flags = 0;
  713         if (mntflags & MNT_FORCE) {
  714                 if (mp->mnt_flag & MNT_ROOTFS)
  715                         return (EINVAL);
  716                 flags |= FORCECLOSE;
  717         }
  718         if ((error = ext2_flushfiles(mp, flags, curthread)) != 0)
  719                 return (error);
  720         ump = VFSTOEXT2(mp);
  721         fs = ump->um_e2fs;
  722         ronly = fs->e2fs_ronly;
  723         if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) {
  724                 if (fs->e2fs_wasvalid)
  725                         fs->e2fs->e2fs_state |= E2FS_ISCLEAN;
  726                 ext2_sbupdate(ump, MNT_WAIT);
  727         }
  728 
  729         DROP_GIANT();
  730         g_topology_lock();
  731         g_vfs_close(ump->um_cp);
  732         g_topology_unlock();
  733         PICKUP_GIANT();
  734         vrele(ump->um_devvp);
  735         sump = fs->e2fs_clustersum;
  736         for (i = 0; i < fs->e2fs_gcount; i++, sump++)
  737                 free(sump->cs_sum, M_EXT2MNT);
  738         free(fs->e2fs_clustersum, M_EXT2MNT);
  739         free(fs->e2fs_maxcluster, M_EXT2MNT);
  740         free(fs->e2fs_gd, M_EXT2MNT);
  741         free(fs->e2fs_contigdirs, M_EXT2MNT);
  742         free(fs->e2fs, M_EXT2MNT);
  743         free(fs, M_EXT2MNT);
  744         free(ump, M_EXT2MNT);
  745         mp->mnt_data = NULL;
  746         MNT_ILOCK(mp);
  747         mp->mnt_flag &= ~MNT_LOCAL;
  748         MNT_IUNLOCK(mp);
  749         return (error);
  750 }
  751 
  752 /*
  753  * Flush out all the files in a filesystem.
  754  */
  755 static int
  756 ext2_flushfiles(struct mount *mp, int flags, struct thread *td)
  757 {
  758         int error;
  759 
  760         error = vflush(mp, 0, flags, td);
  761         return (error);
  762 }
  763 /*
  764  * Get filesystem statistics.
  765  */
  766 int
  767 ext2_statfs(struct mount *mp, struct statfs *sbp)
  768 {
  769         struct ext2mount *ump;
  770         struct m_ext2fs *fs;
  771         uint32_t overhead, overhead_per_group, ngdb;
  772         int i, ngroups;
  773 
  774         ump = VFSTOEXT2(mp);
  775         fs = ump->um_e2fs;
  776         if (fs->e2fs->e2fs_magic != E2FS_MAGIC)
  777                 panic("ext2_statfs");
  778 
  779         /*
  780          * Compute the overhead (FS structures)
  781          */
  782         overhead_per_group =
  783             1 /* block bitmap */ +
  784             1 /* inode bitmap */ +
  785             fs->e2fs_itpg;
  786         overhead = fs->e2fs->e2fs_first_dblock +
  787             fs->e2fs_gcount * overhead_per_group;
  788         if (fs->e2fs->e2fs_rev > E2FS_REV0 &&
  789             fs->e2fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) {
  790                 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) {
  791                         if (cg_has_sb(i))
  792                                 ngroups++;
  793                 }
  794         } else {
  795                 ngroups = fs->e2fs_gcount;
  796         }
  797         ngdb = fs->e2fs_gdbcount;
  798         if (fs->e2fs->e2fs_rev > E2FS_REV0 &&
  799             fs->e2fs->e2fs_features_compat & EXT2F_COMPAT_RESIZE)
  800                 ngdb += fs->e2fs->e2fs_reserved_ngdb;
  801         overhead += ngroups * (1 /* superblock */ + ngdb);
  802 
  803         sbp->f_bsize = EXT2_FRAG_SIZE(fs);
  804         sbp->f_iosize = EXT2_BLOCK_SIZE(fs);
  805         sbp->f_blocks = fs->e2fs->e2fs_bcount - overhead;
  806         sbp->f_bfree = fs->e2fs->e2fs_fbcount;
  807         sbp->f_bavail = sbp->f_bfree - fs->e2fs->e2fs_rbcount;
  808         sbp->f_files = fs->e2fs->e2fs_icount;
  809         sbp->f_ffree = fs->e2fs->e2fs_ficount;
  810         return (0);
  811 }
  812 
  813 /*
  814  * Go through the disk queues to initiate sandbagged IO;
  815  * go through the inodes to write those that have been modified;
  816  * initiate the writing of the super block if it has been modified.
  817  *
  818  * Note: we are always called with the filesystem marked `MPBUSY'.
  819  */
  820 static int
  821 ext2_sync(struct mount *mp, int waitfor)
  822 {
  823         struct vnode *mvp, *vp;
  824         struct thread *td;
  825         struct inode *ip;
  826         struct ext2mount *ump = VFSTOEXT2(mp);
  827         struct m_ext2fs *fs;
  828         int error, allerror = 0;
  829 
  830         td = curthread;
  831         fs = ump->um_e2fs;
  832         if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) {                /* XXX */
  833                 printf("fs = %s\n", fs->e2fs_fsmnt);
  834                 panic("ext2_sync: rofs mod");
  835         }
  836 
  837         /*
  838          * Write back each (modified) inode.
  839          */
  840 loop:
  841         MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
  842                 if (vp->v_type == VNON) {
  843                         VI_UNLOCK(vp);
  844                         continue;
  845                 }
  846                 ip = VTOI(vp);
  847                 if ((ip->i_flag &
  848                     (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
  849                     (vp->v_bufobj.bo_dirty.bv_cnt == 0 ||
  850                     waitfor == MNT_LAZY)) {
  851                         VI_UNLOCK(vp);
  852                         continue;
  853                 }
  854                 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td);
  855                 if (error) {
  856                         if (error == ENOENT) {
  857                                 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
  858                                 goto loop;
  859                         }
  860                         continue;
  861                 }
  862                 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0)
  863                         allerror = error;
  864                 VOP_UNLOCK(vp, 0);
  865                 vrele(vp);
  866         }
  867 
  868         /*
  869          * Force stale filesystem control information to be flushed.
  870          */
  871         if (waitfor != MNT_LAZY) {
  872                 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
  873                 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0)
  874                         allerror = error;
  875                 VOP_UNLOCK(ump->um_devvp, 0);
  876         }
  877 
  878         /*
  879          * Write back modified superblock.
  880          */
  881         if (fs->e2fs_fmod != 0) {
  882                 fs->e2fs_fmod = 0;
  883                 fs->e2fs->e2fs_wtime = time_second;
  884                 if ((error = ext2_cgupdate(ump, waitfor)) != 0)
  885                         allerror = error;
  886         }
  887         return (allerror);
  888 }
  889 
  890 /*
  891  * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it
  892  * in from disk.  If it is in core, wait for the lock bit to clear, then
  893  * return the inode locked.  Detection and handling of mount points must be
  894  * done by the calling routine.
  895  */
  896 static int
  897 ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
  898 {
  899         struct m_ext2fs *fs;
  900         struct inode *ip;
  901         struct ext2mount *ump;
  902         struct buf *bp;
  903         struct vnode *vp;
  904         struct cdev *dev;
  905         struct thread *td;
  906         int i, error;
  907         int used_blocks;
  908 
  909         td = curthread;
  910         error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL);
  911         if (error || *vpp != NULL)
  912                 return (error);
  913 
  914         ump = VFSTOEXT2(mp);
  915         dev = ump->um_dev;
  916         ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO);
  917 
  918         /* Allocate a new vnode/inode. */
  919         if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) {
  920                 *vpp = NULL;
  921                 free(ip, M_EXT2NODE);
  922                 return (error);
  923         }
  924         vp->v_data = ip;
  925         ip->i_vnode = vp;
  926         ip->i_e2fs = fs = ump->um_e2fs;
  927         ip->i_ump  = ump;
  928         ip->i_number = ino;
  929 
  930         lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
  931         error = insmntque(vp, mp);
  932         if (error != 0) {
  933                 free(ip, M_EXT2NODE);
  934                 *vpp = NULL;
  935                 return (error);
  936         }
  937         error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL);
  938         if (error || *vpp != NULL)
  939                 return (error);
  940 
  941         /* Read in the disk contents for the inode, copy into the inode. */
  942         if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
  943             (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) {
  944                 /*
  945                  * The inode does not contain anything useful, so it would
  946                  * be misleading to leave it on its hash chain. With mode
  947                  * still zero, it will be unlinked and returned to the free
  948                  * list by vput().
  949                  */
  950                 brelse(bp);
  951                 vput(vp);
  952                 *vpp = NULL;
  953                 return (error);
  954         }
  955         /* convert ext2 inode to dinode */
  956         ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data + EXT2_INODE_SIZE(fs) *
  957                         ino_to_fsbo(fs, ino)), ip);
  958         ip->i_block_group = ino_to_cg(fs, ino);
  959         ip->i_next_alloc_block = 0;
  960         ip->i_next_alloc_goal = 0;
  961 
  962         /*
  963          * Now we want to make sure that block pointers for unused
  964          * blocks are zeroed out - ext2_balloc depends on this
  965          * although for regular files and directories only
  966          *
  967          * If EXT4_EXTENTS flag is enabled, unused blocks aren't
  968          * zeroed out because we could corrupt the extent tree.
  969          */
  970         if (!(ip->i_flags & EXT4_EXTENTS) &&
  971             (S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode))) {
  972                 used_blocks = (ip->i_size+fs->e2fs_bsize-1) / fs->e2fs_bsize;
  973                 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
  974                         ip->i_db[i] = 0;
  975         }
  976 /*
  977         ext2_print_inode(ip);
  978 */
  979         bqrelse(bp);
  980 
  981         /*
  982          * Initialize the vnode from the inode, check for aliases.
  983          * Note that the underlying vnode may have changed.
  984          */
  985         if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) {
  986                 vput(vp);
  987                 *vpp = NULL;
  988                 return (error);
  989         }
  990 
  991         /*
  992          * Finish inode initialization.
  993          */
  994 
  995         /*
  996          * Set up a generation number for this inode if it does not
  997          * already have one. This should only happen on old filesystems.
  998          */
  999         if (ip->i_gen == 0) {
 1000                 ip->i_gen = random() + 1;
 1001                 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
 1002                         ip->i_flag |= IN_MODIFIED;
 1003         }
 1004         *vpp = vp;
 1005         return (0);
 1006 }
 1007 
 1008 /*
 1009  * File handle to vnode
 1010  *
 1011  * Have to be really careful about stale file handles:
 1012  * - check that the inode number is valid
 1013  * - call ext2_vget() to get the locked inode
 1014  * - check for an unallocated inode (i_mode == 0)
 1015  * - check that the given client host has export rights and return
 1016  *   those rights via. exflagsp and credanonp
 1017  */
 1018 static int
 1019 ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp)
 1020 {
 1021         struct inode *ip;
 1022         struct ufid *ufhp;
 1023         struct vnode *nvp;
 1024         struct m_ext2fs *fs;
 1025         int error;
 1026 
 1027         ufhp = (struct ufid *)fhp;
 1028         fs = VFSTOEXT2(mp)->um_e2fs;
 1029         if (ufhp->ufid_ino < EXT2_ROOTINO ||
 1030             ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg)
 1031                 return (ESTALE);
 1032 
 1033         error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
 1034         if (error) {
 1035                 *vpp = NULLVP;
 1036                 return (error);
 1037         }
 1038         ip = VTOI(nvp);
 1039         if (ip->i_mode == 0 ||
 1040             ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) {
 1041                 vput(nvp);
 1042                 *vpp = NULLVP;
 1043                 return (ESTALE);
 1044         }
 1045         *vpp = nvp;
 1046         vnode_create_vobject(*vpp, 0, curthread);
 1047         return (0);
 1048 }
 1049 
 1050 /*
 1051  * Write a superblock and associated information back to disk.
 1052  */
 1053 static int
 1054 ext2_sbupdate(struct ext2mount *mp, int waitfor)
 1055 {
 1056         struct m_ext2fs *fs = mp->um_e2fs;
 1057         struct ext2fs *es = fs->e2fs;
 1058         struct buf *bp;
 1059         int error = 0;
 1060 
 1061         bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0);
 1062         bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs));
 1063         if (waitfor == MNT_WAIT)
 1064                 error = bwrite(bp);
 1065         else
 1066                 bawrite(bp);
 1067 
 1068         /*
 1069          * The buffers for group descriptors, inode bitmaps and block bitmaps
 1070          * are not busy at this point and are (hopefully) written by the
 1071          * usual sync mechanism. No need to write them here.
 1072          */
 1073         return (error);
 1074 }
 1075 int
 1076 ext2_cgupdate(struct ext2mount *mp, int waitfor)
 1077 {
 1078         struct m_ext2fs *fs = mp->um_e2fs;
 1079         struct buf *bp;
 1080         int i, error = 0, allerror = 0;
 1081 
 1082         allerror = ext2_sbupdate(mp, waitfor);
 1083         for (i = 0; i < fs->e2fs_gdbcount; i++) {
 1084                 bp = getblk(mp->um_devvp, fsbtodb(fs,
 1085                     fs->e2fs->e2fs_first_dblock +
 1086                     1 /* superblock */ + i), fs->e2fs_bsize, 0, 0, 0);
 1087                 e2fs_cgsave(&fs->e2fs_gd[
 1088                     i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
 1089                     (struct ext2_gd *)bp->b_data, fs->e2fs_bsize);
 1090                 if (waitfor == MNT_WAIT)
 1091                         error = bwrite(bp);
 1092                 else
 1093                         bawrite(bp);
 1094         }
 1095 
 1096         if (!allerror && error)
 1097                 allerror = error;
 1098         return (allerror);
 1099 }
 1100 /*
 1101  * Return the root of a filesystem.
 1102  */
 1103 static int
 1104 ext2_root(struct mount *mp, int flags, struct vnode **vpp)
 1105 {
 1106         struct vnode *nvp;
 1107         int error;
 1108 
 1109         error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp);
 1110         if (error)
 1111                 return (error);
 1112         *vpp = nvp;
 1113         return (0);
 1114 }

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