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/10.4/sys/fs/ext2fs/ext2_vfsops.c 311232 2017-01-04 02:43:33Z 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                                                    EXT4F_RO_INCOMPAT_SUPP)) {
  295                         printf(
  296 "WARNING: mount of %s denied due to unsupported optional features\n",
  297                             devtoname(dev));
  298                         return (1);
  299                 }
  300                 if (!ronly &&
  301                     (es->e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP)) {
  302                         printf("WARNING: R/W mount of %s denied due to "
  303                             "unsupported optional features\n", devtoname(dev));
  304                         return (1);
  305                 }
  306         }
  307         return (0);
  308 }
  309 
  310 /*
  311  * This computes the fields of the m_ext2fs structure from the
  312  * data in the ext2fs structure read in.
  313  */
  314 static int
  315 compute_sb_data(struct vnode *devvp, struct ext2fs *es,
  316     struct m_ext2fs *fs)
  317 {
  318         int db_count, error;
  319         int i;
  320         int logic_sb_block = 1; /* XXX for now */
  321         struct buf *bp;
  322         uint32_t e2fs_descpb;
  323 
  324         fs->e2fs_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->e2fs_log_bsize;
  325         fs->e2fs_bsize = 1U << fs->e2fs_bshift;
  326         fs->e2fs_fsbtodb = es->e2fs_log_bsize + 1;
  327         fs->e2fs_qbmask = fs->e2fs_bsize - 1;
  328         fs->e2fs_fsize = EXT2_MIN_FRAG_SIZE << es->e2fs_log_fsize;
  329         if (fs->e2fs_fsize)
  330                 fs->e2fs_fpb = fs->e2fs_bsize / fs->e2fs_fsize;
  331         fs->e2fs_bpg = es->e2fs_bpg;
  332         fs->e2fs_fpg = es->e2fs_fpg;
  333         fs->e2fs_ipg = es->e2fs_ipg;
  334         if (es->e2fs_rev == E2FS_REV0) {
  335                 fs->e2fs_isize = E2FS_REV0_INODE_SIZE;
  336         } else {
  337                 fs->e2fs_isize = es->e2fs_inode_size;
  338 
  339                 /*
  340                  * Simple sanity check for superblock inode size value.
  341                  */
  342                 if (EXT2_INODE_SIZE(fs) < E2FS_REV0_INODE_SIZE ||
  343                     EXT2_INODE_SIZE(fs) > fs->e2fs_bsize ||
  344                     (fs->e2fs_isize & (fs->e2fs_isize - 1)) != 0) {
  345                         printf("ext2fs: invalid inode size %d\n",
  346                             fs->e2fs_isize);
  347                         return (EIO);
  348                 }
  349         }
  350         /* Check for extra isize in big inodes. */
  351         if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_EXTRA_ISIZE) &&
  352             EXT2_INODE_SIZE(fs) < sizeof(struct ext2fs_dinode)) {
  353                 printf("ext2fs: no space for extra inode timestamps\n");
  354                 return (EINVAL);
  355         }
  356 
  357         fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs);
  358         fs->e2fs_itpg = fs->e2fs_ipg / fs->e2fs_ipb;
  359         /* s_resuid / s_resgid ? */
  360         fs->e2fs_gcount = howmany(es->e2fs_bcount - es->e2fs_first_dblock,
  361             EXT2_BLOCKS_PER_GROUP(fs));
  362         e2fs_descpb = fs->e2fs_bsize / sizeof(struct ext2_gd);
  363         db_count = howmany(fs->e2fs_gcount, e2fs_descpb);
  364         fs->e2fs_gdbcount = db_count;
  365         fs->e2fs_gd = malloc(db_count * fs->e2fs_bsize,
  366             M_EXT2MNT, M_WAITOK);
  367         fs->e2fs_contigdirs = malloc(fs->e2fs_gcount *
  368             sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK | M_ZERO);
  369 
  370         /*
  371          * Adjust logic_sb_block.
  372          * Godmar thinks: if the blocksize is greater than 1024, then
  373          * the superblock is logically part of block zero.
  374          */
  375         if (fs->e2fs_bsize > SBSIZE)
  376                 logic_sb_block = 0;
  377         for (i = 0; i < db_count; i++) {
  378                 error = bread(devvp,
  379                     fsbtodb(fs, logic_sb_block + i + 1),
  380                     fs->e2fs_bsize, NOCRED, &bp);
  381                 if (error) {
  382                         free(fs->e2fs_contigdirs, M_EXT2MNT);
  383                         free(fs->e2fs_gd, M_EXT2MNT);
  384                         brelse(bp);
  385                         return (error);
  386                 }
  387                 e2fs_cgload((struct ext2_gd *)bp->b_data,
  388                     &fs->e2fs_gd[
  389                     i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
  390                     fs->e2fs_bsize);
  391                 brelse(bp);
  392                 bp = NULL;
  393         }
  394         /* Initialization for the ext2 Orlov allocator variant. */
  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 
  399         if (es->e2fs_rev == E2FS_REV0 ||
  400             !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE))
  401                 fs->e2fs_maxfilesize = 0x7fffffff;
  402         else {
  403                 fs->e2fs_maxfilesize = 0xffffffffffff;
  404                 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_HUGE_FILE))
  405                         fs->e2fs_maxfilesize = 0x7fffffffffffffff;
  406         }
  407         if (es->e4fs_flags & E2FS_UNSIGNED_HASH) {
  408                 fs->e2fs_uhash = 3;
  409         } else if ((es->e4fs_flags & E2FS_SIGNED_HASH) == 0) {
  410 #ifdef __CHAR_UNSIGNED__
  411                 es->e4fs_flags |= E2FS_UNSIGNED_HASH;
  412                 fs->e2fs_uhash = 3;
  413 #else
  414                 es->e4fs_flags |= E2FS_SIGNED_HASH;
  415 #endif
  416         }
  417 
  418         return (0);
  419 }
  420 
  421 /*
  422  * Reload all incore data for a filesystem (used after running fsck on
  423  * the root filesystem and finding things to fix). The filesystem must
  424  * be mounted read-only.
  425  *
  426  * Things to do to update the mount:
  427  *      1) invalidate all cached meta-data.
  428  *      2) re-read superblock from disk.
  429  *      3) invalidate all cluster summary information.
  430  *      4) invalidate all inactive vnodes.
  431  *      5) invalidate all cached file data.
  432  *      6) re-read inode data for all active vnodes.
  433  * XXX we are missing some steps, in particular # 3, this has to be reviewed.
  434  */
  435 static int
  436 ext2_reload(struct mount *mp, struct thread *td)
  437 {
  438         struct vnode *vp, *mvp, *devvp;
  439         struct inode *ip;
  440         struct buf *bp;
  441         struct ext2fs *es;
  442         struct m_ext2fs *fs;
  443         struct csum *sump;
  444         int error, i;
  445         int32_t *lp;
  446 
  447         if ((mp->mnt_flag & MNT_RDONLY) == 0)
  448                 return (EINVAL);
  449         /*
  450          * Step 1: invalidate all cached meta-data.
  451          */
  452         devvp = VFSTOEXT2(mp)->um_devvp;
  453         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
  454         if (vinvalbuf(devvp, 0, 0, 0) != 0)
  455                 panic("ext2_reload: dirty1");
  456         VOP_UNLOCK(devvp, 0);
  457 
  458         /*
  459          * Step 2: re-read superblock from disk.
  460          * constants have been adjusted for ext2
  461          */
  462         if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
  463                 return (error);
  464         es = (struct ext2fs *)bp->b_data;
  465         if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) {
  466                 brelse(bp);
  467                 return (EIO);           /* XXX needs translation */
  468         }
  469         fs = VFSTOEXT2(mp)->um_e2fs;
  470         bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs));
  471 
  472         if ((error = compute_sb_data(devvp, es, fs)) != 0) {
  473                 brelse(bp);
  474                 return (error);
  475         }
  476 #ifdef UNKLAR
  477         if (fs->fs_sbsize < SBSIZE)
  478                 bp->b_flags |= B_INVAL;
  479 #endif
  480         brelse(bp);
  481 
  482         /*
  483          * Step 3: invalidate all cluster summary information.
  484          */
  485         if (fs->e2fs_contigsumsize > 0) {
  486                 lp = fs->e2fs_maxcluster;
  487                 sump = fs->e2fs_clustersum;
  488                 for (i = 0; i < fs->e2fs_gcount; i++, sump++) {
  489                         *lp++ = fs->e2fs_contigsumsize;
  490                         sump->cs_init = 0;
  491                         bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1);
  492                 }
  493         }
  494 
  495 loop:
  496         MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
  497                 /*
  498                  * Step 4: invalidate all cached file data.
  499                  */
  500                 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
  501                         MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
  502                         goto loop;
  503                 }
  504                 if (vinvalbuf(vp, 0, 0, 0))
  505                         panic("ext2_reload: dirty2");
  506 
  507                 /*
  508                  * Step 5: re-read inode data for all active vnodes.
  509                  */
  510                 ip = VTOI(vp);
  511                 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
  512                     (int)fs->e2fs_bsize, NOCRED, &bp);
  513                 if (error) {
  514                         VOP_UNLOCK(vp, 0);
  515                         vrele(vp);
  516                         MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
  517                         return (error);
  518                 }
  519                 ext2_ei2i((struct ext2fs_dinode *)((char *)bp->b_data +
  520                     EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip);
  521                 brelse(bp);
  522                 VOP_UNLOCK(vp, 0);
  523                 vrele(vp);
  524         }
  525         return (0);
  526 }
  527 
  528 /*
  529  * Common code for mount and mountroot.
  530  */
  531 static int
  532 ext2_mountfs(struct vnode *devvp, struct mount *mp)
  533 {
  534         struct ext2mount *ump;
  535         struct buf *bp;
  536         struct m_ext2fs *fs;
  537         struct ext2fs *es;
  538         struct cdev *dev = devvp->v_rdev;
  539         struct g_consumer *cp;
  540         struct bufobj *bo;
  541         struct csum *sump;
  542         int error;
  543         int ronly;
  544         int i;
  545         u_long size;
  546         int32_t *lp;
  547         int32_t e2fs_maxcontig;
  548 
  549         ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0);
  550         /* XXX: use VOP_ACESS to check FS perms */
  551         DROP_GIANT();
  552         g_topology_lock();
  553         error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1);
  554         g_topology_unlock();
  555         PICKUP_GIANT();
  556         VOP_UNLOCK(devvp, 0);
  557         if (error)
  558                 return (error);
  559 
  560         /* XXX: should we check for some sectorsize or 512 instead? */
  561         if (((SBSIZE % cp->provider->sectorsize) != 0) ||
  562             (SBSIZE < cp->provider->sectorsize)) {
  563                 DROP_GIANT();
  564                 g_topology_lock();
  565                 g_vfs_close(cp);
  566                 g_topology_unlock();
  567                 PICKUP_GIANT();
  568                 return (EINVAL);
  569         }
  570 
  571         bo = &devvp->v_bufobj;
  572         bo->bo_private = cp;
  573         bo->bo_ops = g_vfs_bufops;
  574         if (devvp->v_rdev->si_iosize_max != 0)
  575                 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
  576         if (mp->mnt_iosize_max > MAXPHYS)
  577                 mp->mnt_iosize_max = MAXPHYS;
  578 
  579         bp = NULL;
  580         ump = NULL;
  581         if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
  582                 goto out;
  583         es = (struct ext2fs *)bp->b_data;
  584         if (ext2_check_sb_compat(es, dev, ronly) != 0) {
  585                 error = EINVAL;         /* XXX needs translation */
  586                 goto out;
  587         }
  588         if ((es->e2fs_state & E2FS_ISCLEAN) == 0 ||
  589             (es->e2fs_state & E2FS_ERRORS)) {
  590                 if (ronly || (mp->mnt_flag & MNT_FORCE)) {
  591                         printf(
  592 "WARNING: Filesystem was not properly dismounted\n");
  593                 } else {
  594                         printf(
  595 "WARNING: R/W mount denied.  Filesystem is not clean - run fsck\n");
  596                         error = EPERM;
  597                         goto out;
  598                 }
  599         }
  600         ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO);
  601 
  602         /*
  603          * I don't know whether this is the right strategy. Note that
  604          * we dynamically allocate both an m_ext2fs and an ext2fs
  605          * while Linux keeps the super block in a locked buffer.
  606          */
  607         ump->um_e2fs = malloc(sizeof(struct m_ext2fs),
  608             M_EXT2MNT, M_WAITOK | M_ZERO);
  609         ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs),
  610             M_EXT2MNT, M_WAITOK);
  611         mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF);
  612         bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs));
  613         if ((error = compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs)))
  614                 goto out;
  615 
  616         /*
  617          * Calculate the maximum contiguous blocks and size of cluster summary
  618          * array.  In FFS this is done by newfs; however, the superblock
  619          * in ext2fs doesn't have these variables, so we can calculate
  620          * them here.
  621          */
  622         e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize);
  623         ump->um_e2fs->e2fs_contigsumsize = MIN(e2fs_maxcontig, EXT2_MAXCONTIG);
  624         if (ump->um_e2fs->e2fs_contigsumsize > 0) {
  625                 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t);
  626                 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK);
  627                 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum);
  628                 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK);
  629                 lp = ump->um_e2fs->e2fs_maxcluster;
  630                 sump = ump->um_e2fs->e2fs_clustersum;
  631                 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) {
  632                         *lp++ = ump->um_e2fs->e2fs_contigsumsize;
  633                         sump->cs_init = 0;
  634                         sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) *
  635                             sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO);
  636                 }
  637         }
  638 
  639         brelse(bp);
  640         bp = NULL;
  641         fs = ump->um_e2fs;
  642         fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */
  643 
  644         /*
  645          * If the fs is not mounted read-only, make sure the super block is
  646          * always written back on a sync().
  647          */
  648         fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0;
  649         if (ronly == 0) {
  650                 fs->e2fs_fmod = 1;      /* mark it modified */
  651                 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN;  /* set fs invalid */
  652         }
  653         mp->mnt_data = ump;
  654         mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
  655         mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
  656         mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
  657         MNT_ILOCK(mp);
  658         mp->mnt_flag |= MNT_LOCAL;
  659         MNT_IUNLOCK(mp);
  660         ump->um_mountp = mp;
  661         ump->um_dev = dev;
  662         ump->um_devvp = devvp;
  663         ump->um_bo = &devvp->v_bufobj;
  664         ump->um_cp = cp;
  665 
  666         /*
  667          * Setting those two parameters allowed us to use
  668          * ufs_bmap w/o changse!
  669          */
  670         ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
  671         ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1;
  672         ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
  673         if (ronly == 0)
  674                 ext2_sbupdate(ump, MNT_WAIT);
  675         /*
  676          * Initialize filesystem stat information in mount struct.
  677          */
  678         MNT_ILOCK(mp);
  679         mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED |
  680             MNTK_USES_BCACHE;
  681         MNT_IUNLOCK(mp);
  682         return (0);
  683 out:
  684         if (bp)
  685                 brelse(bp);
  686         if (cp != NULL) {
  687                 DROP_GIANT();
  688                 g_topology_lock();
  689                 g_vfs_close(cp);
  690                 g_topology_unlock();
  691                 PICKUP_GIANT();
  692         }
  693         if (ump) {
  694                 mtx_destroy(EXT2_MTX(ump));
  695                 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT);
  696                 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT);
  697                 free(ump->um_e2fs->e2fs, M_EXT2MNT);
  698                 free(ump->um_e2fs, M_EXT2MNT);
  699                 free(ump, M_EXT2MNT);
  700                 mp->mnt_data = NULL;
  701         }
  702         return (error);
  703 }
  704 
  705 /*
  706  * Unmount system call.
  707  */
  708 static int
  709 ext2_unmount(struct mount *mp, int mntflags)
  710 {
  711         struct ext2mount *ump;
  712         struct m_ext2fs *fs;
  713         struct csum *sump;
  714         int error, flags, i, ronly;
  715 
  716         flags = 0;
  717         if (mntflags & MNT_FORCE) {
  718                 if (mp->mnt_flag & MNT_ROOTFS)
  719                         return (EINVAL);
  720                 flags |= FORCECLOSE;
  721         }
  722         if ((error = ext2_flushfiles(mp, flags, curthread)) != 0)
  723                 return (error);
  724         ump = VFSTOEXT2(mp);
  725         fs = ump->um_e2fs;
  726         ronly = fs->e2fs_ronly;
  727         if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) {
  728                 if (fs->e2fs_wasvalid)
  729                         fs->e2fs->e2fs_state |= E2FS_ISCLEAN;
  730                 ext2_sbupdate(ump, MNT_WAIT);
  731         }
  732 
  733         DROP_GIANT();
  734         g_topology_lock();
  735         g_vfs_close(ump->um_cp);
  736         g_topology_unlock();
  737         PICKUP_GIANT();
  738         vrele(ump->um_devvp);
  739         sump = fs->e2fs_clustersum;
  740         for (i = 0; i < fs->e2fs_gcount; i++, sump++)
  741                 free(sump->cs_sum, M_EXT2MNT);
  742         free(fs->e2fs_clustersum, M_EXT2MNT);
  743         free(fs->e2fs_maxcluster, M_EXT2MNT);
  744         free(fs->e2fs_gd, M_EXT2MNT);
  745         free(fs->e2fs_contigdirs, M_EXT2MNT);
  746         free(fs->e2fs, M_EXT2MNT);
  747         free(fs, M_EXT2MNT);
  748         free(ump, M_EXT2MNT);
  749         mp->mnt_data = NULL;
  750         MNT_ILOCK(mp);
  751         mp->mnt_flag &= ~MNT_LOCAL;
  752         MNT_IUNLOCK(mp);
  753         return (error);
  754 }
  755 
  756 /*
  757  * Flush out all the files in a filesystem.
  758  */
  759 static int
  760 ext2_flushfiles(struct mount *mp, int flags, struct thread *td)
  761 {
  762         int error;
  763 
  764         error = vflush(mp, 0, flags, td);
  765         return (error);
  766 }
  767 
  768 /*
  769  * Get filesystem statistics.
  770  */
  771 int
  772 ext2_statfs(struct mount *mp, struct statfs *sbp)
  773 {
  774         struct ext2mount *ump;
  775         struct m_ext2fs *fs;
  776         uint32_t overhead, overhead_per_group, ngdb;
  777         int i, ngroups;
  778 
  779         ump = VFSTOEXT2(mp);
  780         fs = ump->um_e2fs;
  781         if (fs->e2fs->e2fs_magic != E2FS_MAGIC)
  782                 panic("ext2_statfs");
  783 
  784         /*
  785          * Compute the overhead (FS structures)
  786          */
  787         overhead_per_group =
  788             1 /* block bitmap */ +
  789             1 /* inode bitmap */ +
  790             fs->e2fs_itpg;
  791         overhead = fs->e2fs->e2fs_first_dblock +
  792             fs->e2fs_gcount * overhead_per_group;
  793         if (fs->e2fs->e2fs_rev > E2FS_REV0 &&
  794             fs->e2fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) {
  795                 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) {
  796                         if (cg_has_sb(i))
  797                                 ngroups++;
  798                 }
  799         } else {
  800                 ngroups = fs->e2fs_gcount;
  801         }
  802         ngdb = fs->e2fs_gdbcount;
  803         if (fs->e2fs->e2fs_rev > E2FS_REV0 &&
  804             fs->e2fs->e2fs_features_compat & EXT2F_COMPAT_RESIZE)
  805                 ngdb += fs->e2fs->e2fs_reserved_ngdb;
  806         overhead += ngroups * (1 /* superblock */ + ngdb);
  807 
  808         sbp->f_bsize = EXT2_FRAG_SIZE(fs);
  809         sbp->f_iosize = EXT2_BLOCK_SIZE(fs);
  810         sbp->f_blocks = fs->e2fs->e2fs_bcount - overhead;
  811         sbp->f_bfree = fs->e2fs->e2fs_fbcount;
  812         sbp->f_bavail = sbp->f_bfree - fs->e2fs->e2fs_rbcount;
  813         sbp->f_files = fs->e2fs->e2fs_icount;
  814         sbp->f_ffree = fs->e2fs->e2fs_ficount;
  815         return (0);
  816 }
  817 
  818 /*
  819  * Go through the disk queues to initiate sandbagged IO;
  820  * go through the inodes to write those that have been modified;
  821  * initiate the writing of the super block if it has been modified.
  822  *
  823  * Note: we are always called with the filesystem marked `MPBUSY'.
  824  */
  825 static int
  826 ext2_sync(struct mount *mp, int waitfor)
  827 {
  828         struct vnode *mvp, *vp;
  829         struct thread *td;
  830         struct inode *ip;
  831         struct ext2mount *ump = VFSTOEXT2(mp);
  832         struct m_ext2fs *fs;
  833         int error, allerror = 0;
  834 
  835         td = curthread;
  836         fs = ump->um_e2fs;
  837         if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) {                /* XXX */
  838                 printf("fs = %s\n", fs->e2fs_fsmnt);
  839                 panic("ext2_sync: rofs mod");
  840         }
  841 
  842         /*
  843          * Write back each (modified) inode.
  844          */
  845 loop:
  846         MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
  847                 if (vp->v_type == VNON) {
  848                         VI_UNLOCK(vp);
  849                         continue;
  850                 }
  851                 ip = VTOI(vp);
  852                 if ((ip->i_flag &
  853                     (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
  854                     (vp->v_bufobj.bo_dirty.bv_cnt == 0 ||
  855                     waitfor == MNT_LAZY)) {
  856                         VI_UNLOCK(vp);
  857                         continue;
  858                 }
  859                 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td);
  860                 if (error) {
  861                         if (error == ENOENT) {
  862                                 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
  863                                 goto loop;
  864                         }
  865                         continue;
  866                 }
  867                 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0)
  868                         allerror = error;
  869                 VOP_UNLOCK(vp, 0);
  870                 vrele(vp);
  871         }
  872 
  873         /*
  874          * Force stale filesystem control information to be flushed.
  875          */
  876         if (waitfor != MNT_LAZY) {
  877                 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
  878                 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0)
  879                         allerror = error;
  880                 VOP_UNLOCK(ump->um_devvp, 0);
  881         }
  882 
  883         /*
  884          * Write back modified superblock.
  885          */
  886         if (fs->e2fs_fmod != 0) {
  887                 fs->e2fs_fmod = 0;
  888                 fs->e2fs->e2fs_wtime = time_second;
  889                 if ((error = ext2_cgupdate(ump, waitfor)) != 0)
  890                         allerror = error;
  891         }
  892         return (allerror);
  893 }
  894 
  895 /*
  896  * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it
  897  * in from disk.  If it is in core, wait for the lock bit to clear, then
  898  * return the inode locked.  Detection and handling of mount points must be
  899  * done by the calling routine.
  900  */
  901 static int
  902 ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
  903 {
  904         struct m_ext2fs *fs;
  905         struct inode *ip;
  906         struct ext2mount *ump;
  907         struct buf *bp;
  908         struct vnode *vp;
  909         struct thread *td;
  910         int i, error;
  911         int used_blocks;
  912 
  913         td = curthread;
  914         error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL);
  915         if (error || *vpp != NULL)
  916                 return (error);
  917 
  918         ump = VFSTOEXT2(mp);
  919         ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO);
  920 
  921         /* Allocate a new vnode/inode. */
  922         if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) {
  923                 *vpp = NULL;
  924                 free(ip, M_EXT2NODE);
  925                 return (error);
  926         }
  927         vp->v_data = ip;
  928         ip->i_vnode = vp;
  929         ip->i_e2fs = fs = ump->um_e2fs;
  930         ip->i_ump = ump;
  931         ip->i_number = ino;
  932 
  933         lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
  934         error = insmntque(vp, mp);
  935         if (error != 0) {
  936                 free(ip, M_EXT2NODE);
  937                 *vpp = NULL;
  938                 return (error);
  939         }
  940         error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL);
  941         if (error || *vpp != NULL)
  942                 return (error);
  943 
  944         /* Read in the disk contents for the inode, copy into the inode. */
  945         if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
  946             (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) {
  947                 /*
  948                  * The inode does not contain anything useful, so it would
  949                  * be misleading to leave it on its hash chain. With mode
  950                  * still zero, it will be unlinked and returned to the free
  951                  * list by vput().
  952                  */
  953                 brelse(bp);
  954                 vput(vp);
  955                 *vpp = NULL;
  956                 return (error);
  957         }
  958         /* convert ext2 inode to dinode */
  959         ext2_ei2i((struct ext2fs_dinode *)((char *)bp->b_data + EXT2_INODE_SIZE(fs) *
  960             ino_to_fsbo(fs, ino)), ip);
  961         ip->i_block_group = ino_to_cg(fs, ino);
  962         ip->i_next_alloc_block = 0;
  963         ip->i_next_alloc_goal = 0;
  964 
  965         /*
  966          * Now we want to make sure that block pointers for unused
  967          * blocks are zeroed out - ext2_balloc depends on this
  968          * although for regular files and directories only
  969          *
  970          * If IN_E4EXTENTS is enabled, unused blocks are not zeroed
  971          * out because we could corrupt the extent tree.
  972          */
  973         if (!(ip->i_flag & IN_E4EXTENTS) &&
  974             (S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode))) {
  975                 used_blocks = howmany(ip->i_size, fs->e2fs_bsize);
  976                 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
  977                         ip->i_db[i] = 0;
  978         }
  979 #ifdef EXT2FS_DEBUG
  980         ext2_print_inode(ip);
  981 #endif
  982         bqrelse(bp);
  983 
  984         /*
  985          * Initialize the vnode from the inode, check for aliases.
  986          * Note that the underlying vnode may have changed.
  987          */
  988         if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) {
  989                 vput(vp);
  990                 *vpp = NULL;
  991                 return (error);
  992         }
  993 
  994         /*
  995          * Finish inode initialization.
  996          */
  997 
  998         /*
  999          * Set up a generation number for this inode if it does not
 1000          * already have one. This should only happen on old filesystems.
 1001          */
 1002         if (ip->i_gen == 0) {
 1003                 ip->i_gen = random() + 1;
 1004                 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
 1005                         ip->i_flag |= IN_MODIFIED;
 1006         }
 1007         *vpp = vp;
 1008         return (0);
 1009 }
 1010 
 1011 /*
 1012  * File handle to vnode
 1013  *
 1014  * Have to be really careful about stale file handles:
 1015  * - check that the inode number is valid
 1016  * - call ext2_vget() to get the locked inode
 1017  * - check for an unallocated inode (i_mode == 0)
 1018  * - check that the given client host has export rights and return
 1019  *   those rights via. exflagsp and credanonp
 1020  */
 1021 static int
 1022 ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp)
 1023 {
 1024         struct inode *ip;
 1025         struct ufid *ufhp;
 1026         struct vnode *nvp;
 1027         struct m_ext2fs *fs;
 1028         int error;
 1029 
 1030         ufhp = (struct ufid *)fhp;
 1031         fs = VFSTOEXT2(mp)->um_e2fs;
 1032         if (ufhp->ufid_ino < EXT2_ROOTINO ||
 1033             ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg)
 1034                 return (ESTALE);
 1035 
 1036         error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
 1037         if (error) {
 1038                 *vpp = NULLVP;
 1039                 return (error);
 1040         }
 1041         ip = VTOI(nvp);
 1042         if (ip->i_mode == 0 ||
 1043             ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) {
 1044                 vput(nvp);
 1045                 *vpp = NULLVP;
 1046                 return (ESTALE);
 1047         }
 1048         *vpp = nvp;
 1049         vnode_create_vobject(*vpp, 0, curthread);
 1050         return (0);
 1051 }
 1052 
 1053 /*
 1054  * Write a superblock and associated information back to disk.
 1055  */
 1056 static int
 1057 ext2_sbupdate(struct ext2mount *mp, int waitfor)
 1058 {
 1059         struct m_ext2fs *fs = mp->um_e2fs;
 1060         struct ext2fs *es = fs->e2fs;
 1061         struct buf *bp;
 1062         int error = 0;
 1063 
 1064         bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0);
 1065         bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs));
 1066         if (waitfor == MNT_WAIT)
 1067                 error = bwrite(bp);
 1068         else
 1069                 bawrite(bp);
 1070 
 1071         /*
 1072          * The buffers for group descriptors, inode bitmaps and block bitmaps
 1073          * are not busy at this point and are (hopefully) written by the
 1074          * usual sync mechanism. No need to write them here.
 1075          */
 1076         return (error);
 1077 }
 1078 int
 1079 ext2_cgupdate(struct ext2mount *mp, int waitfor)
 1080 {
 1081         struct m_ext2fs *fs = mp->um_e2fs;
 1082         struct buf *bp;
 1083         int i, error = 0, allerror = 0;
 1084 
 1085         allerror = ext2_sbupdate(mp, waitfor);
 1086         for (i = 0; i < fs->e2fs_gdbcount; i++) {
 1087                 bp = getblk(mp->um_devvp, fsbtodb(fs,
 1088                     fs->e2fs->e2fs_first_dblock +
 1089                     1 /* superblock */ + i), fs->e2fs_bsize, 0, 0, 0);
 1090                 e2fs_cgsave(&fs->e2fs_gd[
 1091                     i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
 1092                     (struct ext2_gd *)bp->b_data, fs->e2fs_bsize);
 1093                 if (waitfor == MNT_WAIT)
 1094                         error = bwrite(bp);
 1095                 else
 1096                         bawrite(bp);
 1097         }
 1098 
 1099         if (!allerror && error)
 1100                 allerror = error;
 1101         return (allerror);
 1102 }
 1103 
 1104 /*
 1105  * Return the root of a filesystem.
 1106  */
 1107 static int
 1108 ext2_root(struct mount *mp, int flags, struct vnode **vpp)
 1109 {
 1110         struct vnode *nvp;
 1111         int error;
 1112 
 1113         error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp);
 1114         if (error)
 1115                 return (error);
 1116         *vpp = nvp;
 1117         return (0);
 1118 }

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