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/10.2/sys/fs/ext2fs/ext2_vfsops.c 282270 2015-04-30 12:39:24Z rmacklem $
   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  ext2_sb_info structure from the
  312  * data in the ext2_super_block 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 = (es->e2fs_bcount - es->e2fs_first_dblock +
  361             EXT2_BLOCKS_PER_GROUP(fs) - 1) / EXT2_BLOCKS_PER_GROUP(fs);
  362         e2fs_descpb = fs->e2fs_bsize / sizeof(struct ext2_gd);
  363         db_count = (fs->e2fs_gcount + e2fs_descpb - 1) / 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 = 0x7fffffffffffffff;
  404         return (0);
  405 }
  406 
  407 /*
  408  * Reload all incore data for a filesystem (used after running fsck on
  409  * the root filesystem and finding things to fix). The filesystem must
  410  * be mounted read-only.
  411  *
  412  * Things to do to update the mount:
  413  *      1) invalidate all cached meta-data.
  414  *      2) re-read superblock from disk.
  415  *      3) invalidate all cluster summary information.
  416  *      4) invalidate all inactive vnodes.
  417  *      5) invalidate all cached file data.
  418  *      6) re-read inode data for all active vnodes.
  419  * XXX we are missing some steps, in particular # 3, this has to be reviewed.
  420  */
  421 static int
  422 ext2_reload(struct mount *mp, struct thread *td)
  423 {
  424         struct vnode *vp, *mvp, *devvp;
  425         struct inode *ip;
  426         struct buf *bp;
  427         struct ext2fs *es;
  428         struct m_ext2fs *fs;
  429         struct csum *sump;
  430         int error, i;
  431         int32_t *lp;
  432 
  433         if ((mp->mnt_flag & MNT_RDONLY) == 0)
  434                 return (EINVAL);
  435         /*
  436          * Step 1: invalidate all cached meta-data.
  437          */
  438         devvp = VFSTOEXT2(mp)->um_devvp;
  439         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
  440         if (vinvalbuf(devvp, 0, 0, 0) != 0)
  441                 panic("ext2_reload: dirty1");
  442         VOP_UNLOCK(devvp, 0);
  443 
  444         /*
  445          * Step 2: re-read superblock from disk.
  446          * constants have been adjusted for ext2
  447          */
  448         if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
  449                 return (error);
  450         es = (struct ext2fs *)bp->b_data;
  451         if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) {
  452                 brelse(bp);
  453                 return (EIO);           /* XXX needs translation */
  454         }
  455         fs = VFSTOEXT2(mp)->um_e2fs;
  456         bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs));
  457 
  458         if((error = compute_sb_data(devvp, es, fs)) != 0) {
  459                 brelse(bp);
  460                 return (error);
  461         }
  462 #ifdef UNKLAR
  463         if (fs->fs_sbsize < SBSIZE)
  464                 bp->b_flags |= B_INVAL;
  465 #endif
  466         brelse(bp);
  467 
  468         /*
  469          * Step 3: invalidate all cluster summary information.
  470          */
  471         if (fs->e2fs_contigsumsize > 0) {
  472                 lp = fs->e2fs_maxcluster;
  473                 sump = fs->e2fs_clustersum;
  474                 for (i = 0; i < fs->e2fs_gcount; i++, sump++) {
  475                         *lp++ = fs->e2fs_contigsumsize;
  476                         sump->cs_init = 0;
  477                         bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1);
  478                 }
  479         }
  480 
  481 loop:
  482         MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
  483                 /*
  484                  * Step 4: invalidate all cached file data.
  485                  */
  486                 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
  487                         MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
  488                         goto loop;
  489                 }
  490                 if (vinvalbuf(vp, 0, 0, 0))
  491                         panic("ext2_reload: dirty2");
  492 
  493                 /*
  494                  * Step 5: re-read inode data for all active vnodes.
  495                  */
  496                 ip = VTOI(vp);
  497                 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
  498                     (int)fs->e2fs_bsize, NOCRED, &bp);
  499                 if (error) {
  500                         VOP_UNLOCK(vp, 0);
  501                         vrele(vp);
  502                         MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
  503                         return (error);
  504                 }
  505                 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data +
  506                     EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip);
  507                 brelse(bp);
  508                 VOP_UNLOCK(vp, 0);
  509                 vrele(vp);
  510         }
  511         return (0);
  512 }
  513 
  514 /*
  515  * Common code for mount and mountroot.
  516  */
  517 static int
  518 ext2_mountfs(struct vnode *devvp, struct mount *mp)
  519 {
  520         struct ext2mount *ump;
  521         struct buf *bp;
  522         struct m_ext2fs *fs;
  523         struct ext2fs *es;
  524         struct cdev *dev = devvp->v_rdev;
  525         struct g_consumer *cp;
  526         struct bufobj *bo;
  527         struct csum *sump;
  528         int error;
  529         int ronly;
  530         int i, size;
  531         int32_t *lp;
  532         int32_t e2fs_maxcontig;
  533 
  534         ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0);
  535         /* XXX: use VOP_ACESS to check FS perms */
  536         DROP_GIANT();
  537         g_topology_lock();
  538         error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1);
  539         g_topology_unlock();
  540         PICKUP_GIANT();
  541         VOP_UNLOCK(devvp, 0);
  542         if (error)
  543                 return (error);
  544 
  545         /* XXX: should we check for some sectorsize or 512 instead? */
  546         if (((SBSIZE % cp->provider->sectorsize) != 0) ||
  547             (SBSIZE < cp->provider->sectorsize)) {
  548                 DROP_GIANT();
  549                 g_topology_lock();
  550                 g_vfs_close(cp);
  551                 g_topology_unlock();
  552                 PICKUP_GIANT();
  553                 return (EINVAL);
  554         }
  555 
  556         bo = &devvp->v_bufobj;
  557         bo->bo_private = cp;
  558         bo->bo_ops = g_vfs_bufops;
  559         if (devvp->v_rdev->si_iosize_max != 0)
  560                 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
  561         if (mp->mnt_iosize_max > MAXPHYS)
  562                 mp->mnt_iosize_max = MAXPHYS;
  563 
  564         bp = NULL;
  565         ump = NULL;
  566         if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
  567                 goto out;
  568         es = (struct ext2fs *)bp->b_data;
  569         if (ext2_check_sb_compat(es, dev, ronly) != 0) {
  570                 error = EINVAL;         /* XXX needs translation */
  571                 goto out;
  572         }
  573         if ((es->e2fs_state & E2FS_ISCLEAN) == 0 ||
  574             (es->e2fs_state & E2FS_ERRORS)) {
  575                 if (ronly || (mp->mnt_flag & MNT_FORCE)) {
  576                         printf(
  577 "WARNING: Filesystem was not properly dismounted\n");
  578                 } else {
  579                         printf(
  580 "WARNING: R/W mount denied.  Filesystem is not clean - run fsck\n");
  581                         error = EPERM;
  582                         goto out;
  583                 }
  584         }
  585         ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO);
  586 
  587         /*
  588          * I don't know whether this is the right strategy. Note that
  589          * we dynamically allocate both an ext2_sb_info and an ext2_super_block
  590          * while Linux keeps the super block in a locked buffer.
  591          */
  592         ump->um_e2fs = malloc(sizeof(struct m_ext2fs),
  593                 M_EXT2MNT, M_WAITOK);
  594         ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs),
  595                 M_EXT2MNT, M_WAITOK);
  596         mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF);
  597         bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs));
  598         if ((error = compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs)))
  599                 goto out;
  600 
  601         /*
  602          * Calculate the maximum contiguous blocks and size of cluster summary
  603          * array.  In FFS this is done by newfs; however, the superblock 
  604          * in ext2fs doesn't have these variables, so we can calculate 
  605          * them here.
  606          */
  607         e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize);
  608         ump->um_e2fs->e2fs_contigsumsize = MIN(e2fs_maxcontig, EXT2_MAXCONTIG);
  609         if (ump->um_e2fs->e2fs_contigsumsize > 0) {
  610                 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t);
  611                 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK);
  612                 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum);
  613                 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK);
  614                 lp = ump->um_e2fs->e2fs_maxcluster;
  615                 sump = ump->um_e2fs->e2fs_clustersum;
  616                 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) {
  617                         *lp++ = ump->um_e2fs->e2fs_contigsumsize;
  618                         sump->cs_init = 0;
  619                         sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) *
  620                             sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO);
  621                 }
  622         }
  623 
  624         brelse(bp);
  625         bp = NULL;
  626         fs = ump->um_e2fs;
  627         fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */
  628 
  629         /*
  630          * If the fs is not mounted read-only, make sure the super block is
  631          * always written back on a sync().
  632          */
  633         fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0;
  634         if (ronly == 0) {
  635                 fs->e2fs_fmod = 1;              /* mark it modified */
  636                 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN;  /* set fs invalid */
  637         }
  638         mp->mnt_data = ump;
  639         mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
  640         mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
  641         mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
  642         MNT_ILOCK(mp);
  643         mp->mnt_flag |= MNT_LOCAL;
  644         MNT_IUNLOCK(mp);
  645         ump->um_mountp = mp;
  646         ump->um_dev = dev;
  647         ump->um_devvp = devvp;
  648         ump->um_bo = &devvp->v_bufobj;
  649         ump->um_cp = cp;
  650 
  651         /*
  652          * Setting those two parameters allowed us to use
  653          * ufs_bmap w/o changse!
  654          */
  655         ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
  656         ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1;
  657         ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
  658         if (ronly == 0)
  659                 ext2_sbupdate(ump, MNT_WAIT);
  660         /*
  661          * Initialize filesystem stat information in mount struct.
  662          */
  663         MNT_ILOCK(mp);
  664         mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED |
  665             MNTK_USES_BCACHE;
  666         MNT_IUNLOCK(mp);
  667         return (0);
  668 out:
  669         if (bp)
  670                 brelse(bp);
  671         if (cp != NULL) {
  672                 DROP_GIANT();
  673                 g_topology_lock();
  674                 g_vfs_close(cp);
  675                 g_topology_unlock();
  676                 PICKUP_GIANT();
  677         }
  678         if (ump) {
  679                 mtx_destroy(EXT2_MTX(ump));
  680                 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT);
  681                 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT);
  682                 free(ump->um_e2fs->e2fs, M_EXT2MNT);
  683                 free(ump->um_e2fs, M_EXT2MNT);
  684                 free(ump, M_EXT2MNT);
  685                 mp->mnt_data = NULL;
  686         }
  687         return (error);
  688 }
  689 
  690 /*
  691  * Unmount system call.
  692  */
  693 static int
  694 ext2_unmount(struct mount *mp, int mntflags)
  695 {
  696         struct ext2mount *ump;
  697         struct m_ext2fs *fs;
  698         struct csum *sump;
  699         int error, flags, i, ronly;
  700 
  701         flags = 0;
  702         if (mntflags & MNT_FORCE) {
  703                 if (mp->mnt_flag & MNT_ROOTFS)
  704                         return (EINVAL);
  705                 flags |= FORCECLOSE;
  706         }
  707         if ((error = ext2_flushfiles(mp, flags, curthread)) != 0)
  708                 return (error);
  709         ump = VFSTOEXT2(mp);
  710         fs = ump->um_e2fs;
  711         ronly = fs->e2fs_ronly;
  712         if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) {
  713                 if (fs->e2fs_wasvalid)
  714                         fs->e2fs->e2fs_state |= E2FS_ISCLEAN;
  715                 ext2_sbupdate(ump, MNT_WAIT);
  716         }
  717 
  718         DROP_GIANT();
  719         g_topology_lock();
  720         g_vfs_close(ump->um_cp);
  721         g_topology_unlock();
  722         PICKUP_GIANT();
  723         vrele(ump->um_devvp);
  724         sump = fs->e2fs_clustersum;
  725         for (i = 0; i < fs->e2fs_gcount; i++, sump++)
  726                 free(sump->cs_sum, M_EXT2MNT);
  727         free(fs->e2fs_clustersum, M_EXT2MNT);
  728         free(fs->e2fs_maxcluster, M_EXT2MNT);
  729         free(fs->e2fs_gd, M_EXT2MNT);
  730         free(fs->e2fs_contigdirs, M_EXT2MNT);
  731         free(fs->e2fs, M_EXT2MNT);
  732         free(fs, M_EXT2MNT);
  733         free(ump, M_EXT2MNT);
  734         mp->mnt_data = NULL;
  735         MNT_ILOCK(mp);
  736         mp->mnt_flag &= ~MNT_LOCAL;
  737         MNT_IUNLOCK(mp);
  738         return (error);
  739 }
  740 
  741 /*
  742  * Flush out all the files in a filesystem.
  743  */
  744 static int
  745 ext2_flushfiles(struct mount *mp, int flags, struct thread *td)
  746 {
  747         int error;
  748 
  749         error = vflush(mp, 0, flags, td);
  750         return (error);
  751 }
  752 /*
  753  * Get filesystem statistics.
  754  */
  755 int
  756 ext2_statfs(struct mount *mp, struct statfs *sbp)
  757 {
  758         struct ext2mount *ump;
  759         struct m_ext2fs *fs;
  760         uint32_t overhead, overhead_per_group, ngdb;
  761         int i, ngroups;
  762 
  763         ump = VFSTOEXT2(mp);
  764         fs = ump->um_e2fs;
  765         if (fs->e2fs->e2fs_magic != E2FS_MAGIC)
  766                 panic("ext2_statfs");
  767 
  768         /*
  769          * Compute the overhead (FS structures)
  770          */
  771         overhead_per_group =
  772             1 /* block bitmap */ +
  773             1 /* inode bitmap */ +
  774             fs->e2fs_itpg;
  775         overhead = fs->e2fs->e2fs_first_dblock +
  776             fs->e2fs_gcount * overhead_per_group;
  777         if (fs->e2fs->e2fs_rev > E2FS_REV0 &&
  778             fs->e2fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) {
  779                 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) {
  780                         if (cg_has_sb(i))
  781                                 ngroups++;
  782                 }
  783         } else {
  784                 ngroups = fs->e2fs_gcount;
  785         }
  786         ngdb = fs->e2fs_gdbcount;
  787         if (fs->e2fs->e2fs_rev > E2FS_REV0 &&
  788             fs->e2fs->e2fs_features_compat & EXT2F_COMPAT_RESIZE)
  789                 ngdb += fs->e2fs->e2fs_reserved_ngdb;
  790         overhead += ngroups * (1 /* superblock */ + ngdb);
  791 
  792         sbp->f_bsize = EXT2_FRAG_SIZE(fs);
  793         sbp->f_iosize = EXT2_BLOCK_SIZE(fs);
  794         sbp->f_blocks = fs->e2fs->e2fs_bcount - overhead;
  795         sbp->f_bfree = fs->e2fs->e2fs_fbcount;
  796         sbp->f_bavail = sbp->f_bfree - fs->e2fs->e2fs_rbcount;
  797         sbp->f_files = fs->e2fs->e2fs_icount;
  798         sbp->f_ffree = fs->e2fs->e2fs_ficount;
  799         return (0);
  800 }
  801 
  802 /*
  803  * Go through the disk queues to initiate sandbagged IO;
  804  * go through the inodes to write those that have been modified;
  805  * initiate the writing of the super block if it has been modified.
  806  *
  807  * Note: we are always called with the filesystem marked `MPBUSY'.
  808  */
  809 static int
  810 ext2_sync(struct mount *mp, int waitfor)
  811 {
  812         struct vnode *mvp, *vp;
  813         struct thread *td;
  814         struct inode *ip;
  815         struct ext2mount *ump = VFSTOEXT2(mp);
  816         struct m_ext2fs *fs;
  817         int error, allerror = 0;
  818 
  819         td = curthread;
  820         fs = ump->um_e2fs;
  821         if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) {                /* XXX */
  822                 printf("fs = %s\n", fs->e2fs_fsmnt);
  823                 panic("ext2_sync: rofs mod");
  824         }
  825 
  826         /*
  827          * Write back each (modified) inode.
  828          */
  829 loop:
  830         MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
  831                 if (vp->v_type == VNON) {
  832                         VI_UNLOCK(vp);
  833                         continue;
  834                 }
  835                 ip = VTOI(vp);
  836                 if ((ip->i_flag &
  837                     (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
  838                     (vp->v_bufobj.bo_dirty.bv_cnt == 0 ||
  839                     waitfor == MNT_LAZY)) {
  840                         VI_UNLOCK(vp);
  841                         continue;
  842                 }
  843                 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td);
  844                 if (error) {
  845                         if (error == ENOENT) {
  846                                 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
  847                                 goto loop;
  848                         }
  849                         continue;
  850                 }
  851                 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0)
  852                         allerror = error;
  853                 VOP_UNLOCK(vp, 0);
  854                 vrele(vp);
  855         }
  856 
  857         /*
  858          * Force stale filesystem control information to be flushed.
  859          */
  860         if (waitfor != MNT_LAZY) {
  861                 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
  862                 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0)
  863                         allerror = error;
  864                 VOP_UNLOCK(ump->um_devvp, 0);
  865         }
  866 
  867         /*
  868          * Write back modified superblock.
  869          */
  870         if (fs->e2fs_fmod != 0) {
  871                 fs->e2fs_fmod = 0;
  872                 fs->e2fs->e2fs_wtime = time_second;
  873                 if ((error = ext2_cgupdate(ump, waitfor)) != 0)
  874                         allerror = error;
  875         }
  876         return (allerror);
  877 }
  878 
  879 /*
  880  * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it
  881  * in from disk.  If it is in core, wait for the lock bit to clear, then
  882  * return the inode locked.  Detection and handling of mount points must be
  883  * done by the calling routine.
  884  */
  885 static int
  886 ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
  887 {
  888         struct m_ext2fs *fs;
  889         struct inode *ip;
  890         struct ext2mount *ump;
  891         struct buf *bp;
  892         struct vnode *vp;
  893         struct thread *td;
  894         int i, error;
  895         int used_blocks;
  896 
  897         td = curthread;
  898         error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL);
  899         if (error || *vpp != NULL)
  900                 return (error);
  901 
  902         ump = VFSTOEXT2(mp);
  903         ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO);
  904 
  905         /* Allocate a new vnode/inode. */
  906         if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) {
  907                 *vpp = NULL;
  908                 free(ip, M_EXT2NODE);
  909                 return (error);
  910         }
  911         vp->v_data = ip;
  912         ip->i_vnode = vp;
  913         ip->i_e2fs = fs = ump->um_e2fs;
  914         ip->i_ump  = ump;
  915         ip->i_number = ino;
  916 
  917         lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
  918         error = insmntque(vp, mp);
  919         if (error != 0) {
  920                 free(ip, M_EXT2NODE);
  921                 *vpp = NULL;
  922                 return (error);
  923         }
  924         error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL);
  925         if (error || *vpp != NULL)
  926                 return (error);
  927 
  928         /* Read in the disk contents for the inode, copy into the inode. */
  929         if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
  930             (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) {
  931                 /*
  932                  * The inode does not contain anything useful, so it would
  933                  * be misleading to leave it on its hash chain. With mode
  934                  * still zero, it will be unlinked and returned to the free
  935                  * list by vput().
  936                  */
  937                 brelse(bp);
  938                 vput(vp);
  939                 *vpp = NULL;
  940                 return (error);
  941         }
  942         /* convert ext2 inode to dinode */
  943         ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data + EXT2_INODE_SIZE(fs) *
  944                         ino_to_fsbo(fs, ino)), ip);
  945         ip->i_block_group = ino_to_cg(fs, ino);
  946         ip->i_next_alloc_block = 0;
  947         ip->i_next_alloc_goal = 0;
  948 
  949         /*
  950          * Now we want to make sure that block pointers for unused
  951          * blocks are zeroed out - ext2_balloc depends on this
  952          * although for regular files and directories only
  953          *
  954          * If IN_E4EXTENTS is enabled, unused blocks are not zeroed
  955          * out because we could corrupt the extent tree.
  956          */
  957         if (!(ip->i_flag & IN_E4EXTENTS) &&
  958             (S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode))) {
  959                 used_blocks = (ip->i_size+fs->e2fs_bsize-1) / fs->e2fs_bsize;
  960                 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
  961                         ip->i_db[i] = 0;
  962         }
  963 #ifdef EXT2FS_DEBUG
  964         ext2_print_inode(ip);
  965 #endif
  966         bqrelse(bp);
  967 
  968         /*
  969          * Initialize the vnode from the inode, check for aliases.
  970          * Note that the underlying vnode may have changed.
  971          */
  972         if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) {
  973                 vput(vp);
  974                 *vpp = NULL;
  975                 return (error);
  976         }
  977 
  978         /*
  979          * Finish inode initialization.
  980          */
  981 
  982         /*
  983          * Set up a generation number for this inode if it does not
  984          * already have one. This should only happen on old filesystems.
  985          */
  986         if (ip->i_gen == 0) {
  987                 ip->i_gen = random() + 1;
  988                 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
  989                         ip->i_flag |= IN_MODIFIED;
  990         }
  991         *vpp = vp;
  992         return (0);
  993 }
  994 
  995 /*
  996  * File handle to vnode
  997  *
  998  * Have to be really careful about stale file handles:
  999  * - check that the inode number is valid
 1000  * - call ext2_vget() to get the locked inode
 1001  * - check for an unallocated inode (i_mode == 0)
 1002  * - check that the given client host has export rights and return
 1003  *   those rights via. exflagsp and credanonp
 1004  */
 1005 static int
 1006 ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp)
 1007 {
 1008         struct inode *ip;
 1009         struct ufid *ufhp;
 1010         struct vnode *nvp;
 1011         struct m_ext2fs *fs;
 1012         int error;
 1013 
 1014         ufhp = (struct ufid *)fhp;
 1015         fs = VFSTOEXT2(mp)->um_e2fs;
 1016         if (ufhp->ufid_ino < EXT2_ROOTINO ||
 1017             ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg)
 1018                 return (ESTALE);
 1019 
 1020         error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
 1021         if (error) {
 1022                 *vpp = NULLVP;
 1023                 return (error);
 1024         }
 1025         ip = VTOI(nvp);
 1026         if (ip->i_mode == 0 ||
 1027             ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) {
 1028                 vput(nvp);
 1029                 *vpp = NULLVP;
 1030                 return (ESTALE);
 1031         }
 1032         *vpp = nvp;
 1033         vnode_create_vobject(*vpp, 0, curthread);
 1034         return (0);
 1035 }
 1036 
 1037 /*
 1038  * Write a superblock and associated information back to disk.
 1039  */
 1040 static int
 1041 ext2_sbupdate(struct ext2mount *mp, int waitfor)
 1042 {
 1043         struct m_ext2fs *fs = mp->um_e2fs;
 1044         struct ext2fs *es = fs->e2fs;
 1045         struct buf *bp;
 1046         int error = 0;
 1047 
 1048         bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0);
 1049         bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs));
 1050         if (waitfor == MNT_WAIT)
 1051                 error = bwrite(bp);
 1052         else
 1053                 bawrite(bp);
 1054 
 1055         /*
 1056          * The buffers for group descriptors, inode bitmaps and block bitmaps
 1057          * are not busy at this point and are (hopefully) written by the
 1058          * usual sync mechanism. No need to write them here.
 1059          */
 1060         return (error);
 1061 }
 1062 int
 1063 ext2_cgupdate(struct ext2mount *mp, int waitfor)
 1064 {
 1065         struct m_ext2fs *fs = mp->um_e2fs;
 1066         struct buf *bp;
 1067         int i, error = 0, allerror = 0;
 1068 
 1069         allerror = ext2_sbupdate(mp, waitfor);
 1070         for (i = 0; i < fs->e2fs_gdbcount; i++) {
 1071                 bp = getblk(mp->um_devvp, fsbtodb(fs,
 1072                     fs->e2fs->e2fs_first_dblock +
 1073                     1 /* superblock */ + i), fs->e2fs_bsize, 0, 0, 0);
 1074                 e2fs_cgsave(&fs->e2fs_gd[
 1075                     i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
 1076                     (struct ext2_gd *)bp->b_data, fs->e2fs_bsize);
 1077                 if (waitfor == MNT_WAIT)
 1078                         error = bwrite(bp);
 1079                 else
 1080                         bawrite(bp);
 1081         }
 1082 
 1083         if (!allerror && error)
 1084                 allerror = error;
 1085         return (allerror);
 1086 }
 1087 /*
 1088  * Return the root of a filesystem.
 1089  */
 1090 static int
 1091 ext2_root(struct mount *mp, int flags, struct vnode **vpp)
 1092 {
 1093         struct vnode *nvp;
 1094         int error;
 1095 
 1096         error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp);
 1097         if (error)
 1098                 return (error);
 1099         *vpp = nvp;
 1100         return (0);
 1101 }

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