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/9.2/sys/fs/ext2fs/ext2_vfsops.c 251731 2013-06-14 03:58:52Z 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 = 0;
  116         struct m_ext2fs *fs;
  117         struct nameidata nd, *ndp = &nd;
  118         accmode_t accmode;
  119         char *path, *fspec;
  120         int error, flags, len;
  121 
  122         td = curthread;
  123         opts = mp->mnt_optnew;
  124 
  125         if (vfs_filteropt(opts, ext2_opts))
  126                 return (EINVAL);
  127 
  128         vfs_getopt(opts, "fspath", (void **)&path, NULL);
  129         /* Double-check the length of path.. */
  130         if (strlen(path) >= MAXMNTLEN)
  131                 return (ENAMETOOLONG);
  132 
  133         fspec = NULL;
  134         error = vfs_getopt(opts, "from", (void **)&fspec, &len);
  135         if (!error && fspec[len - 1] != '\0')
  136                 return (EINVAL);
  137 
  138         /*
  139          * If updating, check whether changing from read-only to
  140          * read/write; if there is no device name, that's all we do.
  141          */
  142         if (mp->mnt_flag & MNT_UPDATE) {
  143                 ump = VFSTOEXT2(mp);
  144                 fs = ump->um_e2fs; 
  145                 error = 0;
  146                 if (fs->e2fs_ronly == 0 &&
  147                     vfs_flagopt(opts, "ro", NULL, 0)) {
  148                         error = VFS_SYNC(mp, MNT_WAIT);
  149                         if (error)
  150                                 return (error);
  151                         flags = WRITECLOSE;
  152                         if (mp->mnt_flag & MNT_FORCE)
  153                                 flags |= FORCECLOSE;
  154                         error = ext2_flushfiles(mp, flags, td);
  155                         if ( error == 0 && fs->e2fs_wasvalid && ext2_cgupdate(ump, MNT_WAIT) == 0) {
  156                                 fs->e2fs->e2fs_state |= E2FS_ISCLEAN;
  157                                 ext2_sbupdate(ump, MNT_WAIT);
  158                         }
  159                         fs->e2fs_ronly = 1;
  160                         vfs_flagopt(opts, "ro", &mp->mnt_flag, MNT_RDONLY);
  161                         DROP_GIANT();
  162                         g_topology_lock();
  163                         g_access(ump->um_cp, 0, -1, 0);
  164                         g_topology_unlock();
  165                         PICKUP_GIANT();
  166                 }
  167                 if (!error && (mp->mnt_flag & MNT_RELOAD))
  168                         error = ext2_reload(mp, td);
  169                 if (error)
  170                         return (error);
  171                 devvp = ump->um_devvp;
  172                 if (fs->e2fs_ronly && !vfs_flagopt(opts, "ro", NULL, 0)) {
  173                         if (ext2_check_sb_compat(fs->e2fs, devvp->v_rdev, 0))
  174                                 return (EPERM);
  175 
  176                         /*
  177                          * If upgrade to read-write by non-root, then verify
  178                          * that user has necessary permissions on the device.
  179                          */
  180                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
  181                         error = VOP_ACCESS(devvp, VREAD | VWRITE,
  182                             td->td_ucred, td);
  183                         if (error)
  184                                 error = priv_check(td, PRIV_VFS_MOUNT_PERM);
  185                         if (error) {
  186                                 VOP_UNLOCK(devvp, 0);
  187                                 return (error);
  188                         }
  189                         VOP_UNLOCK(devvp, 0);
  190                         DROP_GIANT();
  191                         g_topology_lock();
  192                         error = g_access(ump->um_cp, 0, 1, 0);
  193                         g_topology_unlock();
  194                         PICKUP_GIANT();
  195                         if (error)
  196                                 return (error);
  197 
  198                         if ((fs->e2fs->e2fs_state & E2FS_ISCLEAN) == 0 ||
  199                             (fs->e2fs->e2fs_state & E2FS_ERRORS)) {
  200                                 if (mp->mnt_flag & MNT_FORCE) {
  201                                         printf(
  202 "WARNING: %s was not properly dismounted\n", fs->e2fs_fsmnt);
  203                                 } else {
  204                                         printf(
  205 "WARNING: R/W mount of %s denied.  Filesystem is not clean - run fsck\n",
  206                                             fs->e2fs_fsmnt);
  207                                         return (EPERM);
  208                                 }
  209                         }
  210                         fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN;
  211                         (void)ext2_cgupdate(ump, MNT_WAIT);
  212                         fs->e2fs_ronly = 0;
  213                         MNT_ILOCK(mp);
  214                         mp->mnt_flag &= ~MNT_RDONLY;
  215                         MNT_IUNLOCK(mp);
  216                 }
  217                 if (vfs_flagopt(opts, "export", NULL, 0)) {
  218                         /* Process export requests in vfs_mount.c. */
  219                         return (error);
  220                 }
  221         }
  222 
  223         /*
  224          * Not an update, or updating the name: look up the name
  225          * and verify that it refers to a sensible disk device.
  226          */
  227         if (fspec == NULL)
  228                 return (EINVAL);
  229         NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td);
  230         if ((error = namei(ndp)) != 0)
  231                 return (error);
  232         NDFREE(ndp, NDF_ONLY_PNBUF);
  233         devvp = ndp->ni_vp;
  234 
  235         if (!vn_isdisk(devvp, &error)) {
  236                 vput(devvp);
  237                 return (error);
  238         }
  239 
  240         /*
  241          * If mount by non-root, then verify that user has necessary
  242          * permissions on the device.
  243          *
  244          * XXXRW: VOP_ACCESS() enough?
  245          */
  246         accmode = VREAD;
  247         if ((mp->mnt_flag & MNT_RDONLY) == 0)
  248                 accmode |= VWRITE;
  249         error = VOP_ACCESS(devvp, accmode, td->td_ucred, td);
  250         if (error)
  251                 error = priv_check(td, PRIV_VFS_MOUNT_PERM);
  252         if (error) {
  253                 vput(devvp);
  254                 return (error);
  255         }
  256 
  257         if ((mp->mnt_flag & MNT_UPDATE) == 0) {
  258                 error = ext2_mountfs(devvp, mp);
  259         } else {
  260                 if (devvp != ump->um_devvp) {
  261                         vput(devvp);
  262                         return (EINVAL);        /* needs translation */
  263                 } else
  264                         vput(devvp);
  265         }
  266         if (error) {
  267                 vrele(devvp);
  268                 return (error);
  269         }
  270         ump = VFSTOEXT2(mp);
  271         fs = ump->um_e2fs;
  272 
  273         /*
  274          * Note that this strncpy() is ok because of a check at the start
  275          * of ext2_mount().
  276          */
  277         strncpy(fs->e2fs_fsmnt, path, MAXMNTLEN);
  278         fs->e2fs_fsmnt[MAXMNTLEN - 1] = '\0';
  279         vfs_mountedfrom(mp, fspec);
  280         return (0);
  281 }
  282 
  283 static int
  284 ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev, int ronly)
  285 {
  286 
  287         if (es->e2fs_magic != E2FS_MAGIC) {
  288                 printf("ext2fs: %s: wrong magic number %#x (expected %#x)\n",
  289                     devtoname(dev), es->e2fs_magic, E2FS_MAGIC);
  290                 return (1);
  291         }
  292         if (es->e2fs_rev > E2FS_REV0) {
  293                 if (es->e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP) {
  294                         printf(
  295 "WARNING: mount of %s denied due to unsupported optional features\n",
  296                             devtoname(dev));
  297                         return (1);
  298                 }
  299                 if (!ronly &&
  300                     (es->e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP)) {
  301                         printf("WARNING: R/W mount of %s denied due to "
  302                             "unsupported optional features\n", devtoname(dev));
  303                         return (1);
  304                 }
  305         }
  306         return (0);
  307 }
  308 
  309 /*
  310  * This computes the fields of the  ext2_sb_info structure from the
  311  * data in the ext2_super_block structure read in.
  312  */
  313 static int
  314 compute_sb_data(struct vnode *devvp, struct ext2fs *es,
  315     struct m_ext2fs *fs)
  316 {
  317         int db_count, error;
  318         int i;
  319         int logic_sb_block = 1; /* XXX for now */
  320         struct buf *bp;
  321         uint32_t e2fs_descpb;
  322 
  323         fs->e2fs_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->e2fs_log_bsize;
  324         fs->e2fs_bsize = 1U << fs->e2fs_bshift;
  325         fs->e2fs_fsbtodb = es->e2fs_log_bsize + 1;
  326         fs->e2fs_qbmask = fs->e2fs_bsize - 1;
  327         fs->e2fs_fsize = EXT2_MIN_FRAG_SIZE << es->e2fs_log_fsize;
  328         if (fs->e2fs_fsize)
  329                 fs->e2fs_fpb = fs->e2fs_bsize / fs->e2fs_fsize;
  330         fs->e2fs_bpg = es->e2fs_bpg;
  331         fs->e2fs_fpg = es->e2fs_fpg;
  332         fs->e2fs_ipg = es->e2fs_ipg;
  333         if (es->e2fs_rev == E2FS_REV0) {
  334                 fs->e2fs_isize = E2FS_REV0_INODE_SIZE ;
  335         } else {
  336                 fs->e2fs_isize = es->e2fs_inode_size;
  337 
  338                 /*
  339                  * Simple sanity check for superblock inode size value.
  340                  */
  341                 if (EXT2_INODE_SIZE(fs) < E2FS_REV0_INODE_SIZE ||
  342                     EXT2_INODE_SIZE(fs) > fs->e2fs_bsize ||
  343                     (fs->e2fs_isize & (fs->e2fs_isize - 1)) != 0) {
  344                         printf("ext2fs: invalid inode size %d\n",
  345                             fs->e2fs_isize);
  346                         return (EIO);
  347                 }
  348         }
  349         /* Check for extra isize in big inodes. */
  350         if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_EXTRA_ISIZE) &&
  351             EXT2_INODE_SIZE(fs) < sizeof(struct ext2fs_dinode)) {
  352                 printf("ext2fs: no space for extra inode timestamps\n");
  353                 return (EINVAL);
  354         }
  355 
  356         fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs);
  357         fs->e2fs_itpg = fs->e2fs_ipg /fs->e2fs_ipb;
  358         /* s_resuid / s_resgid ? */
  359         fs->e2fs_gcount = (es->e2fs_bcount - es->e2fs_first_dblock +
  360             EXT2_BLOCKS_PER_GROUP(fs) - 1) / EXT2_BLOCKS_PER_GROUP(fs);
  361         e2fs_descpb = fs->e2fs_bsize / sizeof(struct ext2_gd);
  362         db_count = (fs->e2fs_gcount + e2fs_descpb - 1) / e2fs_descpb;
  363         fs->e2fs_gdbcount = db_count;
  364         fs->e2fs_gd = malloc(db_count * fs->e2fs_bsize,
  365             M_EXT2MNT, M_WAITOK);
  366         fs->e2fs_contigdirs = malloc(fs->e2fs_gcount *
  367             sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK);
  368 
  369         /*
  370          * Adjust logic_sb_block.
  371          * Godmar thinks: if the blocksize is greater than 1024, then
  372          * the superblock is logically part of block zero.
  373          */
  374         if(fs->e2fs_bsize > SBSIZE)
  375                 logic_sb_block = 0;
  376         for (i = 0; i < db_count; i++) {
  377                 error = bread(devvp ,
  378                          fsbtodb(fs, logic_sb_block + i + 1 ),
  379                         fs->e2fs_bsize, NOCRED, &bp);
  380                 if (error) {
  381                         free(fs->e2fs_gd, M_EXT2MNT);
  382                         brelse(bp);
  383                         return (error);
  384                 }
  385                 e2fs_cgload((struct ext2_gd *)bp->b_data,
  386                     &fs->e2fs_gd[
  387                         i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
  388                     fs->e2fs_bsize);
  389                 brelse(bp);
  390                 bp = NULL;
  391         }
  392         fs->e2fs_total_dir = 0;
  393         for (i=0; i < fs->e2fs_gcount; i++){
  394                 fs->e2fs_total_dir += fs->e2fs_gd[i].ext2bgd_ndirs;
  395                 fs->e2fs_contigdirs[i] = 0;
  396         }
  397         if (es->e2fs_rev == E2FS_REV0 ||
  398             !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE))
  399                 fs->e2fs_maxfilesize = 0x7fffffff;
  400         else
  401                 fs->e2fs_maxfilesize = 0x7fffffffffffffff;
  402         return (0);
  403 }
  404 
  405 /*
  406  * Reload all incore data for a filesystem (used after running fsck on
  407  * the root filesystem and finding things to fix). The filesystem must
  408  * be mounted read-only.
  409  *
  410  * Things to do to update the mount:
  411  *      1) invalidate all cached meta-data.
  412  *      2) re-read superblock from disk.
  413  *      3) invalidate all cluster summary information.
  414  *      4) invalidate all inactive vnodes.
  415  *      5) invalidate all cached file data.
  416  *      6) re-read inode data for all active vnodes.
  417  * XXX we are missing some steps, in particular # 3, this has to be reviewed.
  418  */
  419 static int
  420 ext2_reload(struct mount *mp, struct thread *td)
  421 {
  422         struct vnode *vp, *mvp, *devvp;
  423         struct inode *ip;
  424         struct buf *bp;
  425         struct ext2fs *es;
  426         struct m_ext2fs *fs;
  427         struct csum *sump;
  428         int error, i;
  429         int32_t *lp;
  430 
  431         if ((mp->mnt_flag & MNT_RDONLY) == 0)
  432                 return (EINVAL);
  433         /*
  434          * Step 1: invalidate all cached meta-data.
  435          */
  436         devvp = VFSTOEXT2(mp)->um_devvp;
  437         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
  438         if (vinvalbuf(devvp, 0, 0, 0) != 0)
  439                 panic("ext2_reload: dirty1");
  440         VOP_UNLOCK(devvp, 0);
  441 
  442         /*
  443          * Step 2: re-read superblock from disk.
  444          * constants have been adjusted for ext2
  445          */
  446         if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
  447                 return (error);
  448         es = (struct ext2fs *)bp->b_data;
  449         if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) {
  450                 brelse(bp);
  451                 return (EIO);           /* XXX needs translation */
  452         }
  453         fs = VFSTOEXT2(mp)->um_e2fs;
  454         bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs));
  455 
  456         if((error = compute_sb_data(devvp, es, fs)) != 0) {
  457                 brelse(bp);
  458                 return (error);
  459         }
  460 #ifdef UNKLAR
  461         if (fs->fs_sbsize < SBSIZE)
  462                 bp->b_flags |= B_INVAL;
  463 #endif
  464         brelse(bp);
  465 
  466         /*
  467          * Step 3: invalidate all cluster summary information.
  468          */
  469         if (fs->e2fs_contigsumsize > 0) {
  470                 lp = fs->e2fs_maxcluster;
  471                 sump = fs->e2fs_clustersum;
  472                 for (i = 0; i < fs->e2fs_gcount; i++, sump++) {
  473                         *lp++ = fs->e2fs_contigsumsize;
  474                         sump->cs_init = 0;
  475                         bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1);
  476                 }
  477         }
  478 
  479 loop:
  480         MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
  481                 /*
  482                  * Step 4: invalidate all cached file data.
  483                  */
  484                 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
  485                         MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
  486                         goto loop;
  487                 }
  488                 if (vinvalbuf(vp, 0, 0, 0))
  489                         panic("ext2_reload: dirty2");
  490 
  491                 /*
  492                  * Step 5: re-read inode data for all active vnodes.
  493                  */
  494                 ip = VTOI(vp);
  495                 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
  496                     (int)fs->e2fs_bsize, NOCRED, &bp);
  497                 if (error) {
  498                         VOP_UNLOCK(vp, 0);
  499                         vrele(vp);
  500                         MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
  501                         return (error);
  502                 }
  503                 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data +
  504                     EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip);
  505                 brelse(bp);
  506                 VOP_UNLOCK(vp, 0);
  507                 vrele(vp);
  508         }
  509         return (0);
  510 }
  511 
  512 /*
  513  * Common code for mount and mountroot.
  514  */
  515 static int
  516 ext2_mountfs(struct vnode *devvp, struct mount *mp)
  517 {
  518         struct ext2mount *ump;
  519         struct buf *bp;
  520         struct m_ext2fs *fs;
  521         struct ext2fs *es;
  522         struct cdev *dev = devvp->v_rdev;
  523         struct g_consumer *cp;
  524         struct bufobj *bo;
  525         struct csum *sump;
  526         int error;
  527         int ronly;
  528         int i, size;
  529         int32_t *lp;
  530         int32_t e2fs_maxcontig;
  531 
  532         ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0);
  533         /* XXX: use VOP_ACESS to check FS perms */
  534         DROP_GIANT();
  535         g_topology_lock();
  536         error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1);
  537         g_topology_unlock();
  538         PICKUP_GIANT();
  539         VOP_UNLOCK(devvp, 0);
  540         if (error)
  541                 return (error);
  542 
  543         /* XXX: should we check for some sectorsize or 512 instead? */
  544         if (((SBSIZE % cp->provider->sectorsize) != 0) ||
  545             (SBSIZE < cp->provider->sectorsize)) {
  546                 DROP_GIANT();
  547                 g_topology_lock();
  548                 g_vfs_close(cp);
  549                 g_topology_unlock();
  550                 PICKUP_GIANT();
  551                 return (EINVAL);
  552         }
  553 
  554         bo = &devvp->v_bufobj;
  555         bo->bo_private = cp;
  556         bo->bo_ops = g_vfs_bufops;
  557         if (devvp->v_rdev->si_iosize_max != 0)
  558                 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
  559         if (mp->mnt_iosize_max > MAXPHYS)
  560                 mp->mnt_iosize_max = MAXPHYS;
  561 
  562         bp = NULL;
  563         ump = NULL;
  564         if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
  565                 goto out;
  566         es = (struct ext2fs *)bp->b_data;
  567         if (ext2_check_sb_compat(es, dev, ronly) != 0) {
  568                 error = EINVAL;         /* XXX needs translation */
  569                 goto out;
  570         }
  571         if ((es->e2fs_state & E2FS_ISCLEAN) == 0 ||
  572             (es->e2fs_state & E2FS_ERRORS)) {
  573                 if (ronly || (mp->mnt_flag & MNT_FORCE)) {
  574                         printf(
  575 "WARNING: Filesystem was not properly dismounted\n");
  576                 } else {
  577                         printf(
  578 "WARNING: R/W mount denied.  Filesystem is not clean - run fsck\n");
  579                         error = EPERM;
  580                         goto out;
  581                 }
  582         }
  583         ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO);
  584 
  585         /*
  586          * I don't know whether this is the right strategy. Note that
  587          * we dynamically allocate both an ext2_sb_info and an ext2_super_block
  588          * while Linux keeps the super block in a locked buffer.
  589          */
  590         ump->um_e2fs = malloc(sizeof(struct m_ext2fs),
  591                 M_EXT2MNT, M_WAITOK);
  592         ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs),
  593                 M_EXT2MNT, M_WAITOK);
  594         mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF);
  595         bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs));
  596         if ((error = compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs)))
  597                 goto out;
  598 
  599         /*
  600          * Calculate the maximum contiguous blocks and size of cluster summary
  601          * array.  In FFS this is done by newfs; however, the superblock 
  602          * in ext2fs doesn't have these variables, so we can calculate 
  603          * them here.
  604          */
  605         e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize);
  606         ump->um_e2fs->e2fs_contigsumsize = MIN(e2fs_maxcontig, EXT2_MAXCONTIG);
  607         if (ump->um_e2fs->e2fs_contigsumsize > 0) {
  608                 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t);
  609                 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK);
  610                 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum);
  611                 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK);
  612                 lp = ump->um_e2fs->e2fs_maxcluster;
  613                 sump = ump->um_e2fs->e2fs_clustersum;
  614                 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) {
  615                         *lp++ = ump->um_e2fs->e2fs_contigsumsize;
  616                         sump->cs_init = 0;
  617                         sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) *
  618                             sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO);
  619                 }
  620         }
  621 
  622         brelse(bp);
  623         bp = NULL;
  624         fs = ump->um_e2fs;
  625         fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */
  626 
  627         /*
  628          * If the fs is not mounted read-only, make sure the super block is
  629          * always written back on a sync().
  630          */
  631         fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0;
  632         if (ronly == 0) {
  633                 fs->e2fs_fmod = 1;              /* mark it modified */
  634                 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN;  /* set fs invalid */
  635         }
  636         mp->mnt_data = ump;
  637         mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
  638         mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
  639         mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
  640         MNT_ILOCK(mp);
  641         mp->mnt_flag |= MNT_LOCAL;
  642         MNT_IUNLOCK(mp);
  643         ump->um_mountp = mp;
  644         ump->um_dev = dev;
  645         ump->um_devvp = devvp;
  646         ump->um_bo = &devvp->v_bufobj;
  647         ump->um_cp = cp;
  648 
  649         /*
  650          * Setting those two parameters allowed us to use
  651          * ufs_bmap w/o changse!
  652          */
  653         ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
  654         ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1;
  655         ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
  656         if (ronly == 0)
  657                 ext2_sbupdate(ump, MNT_WAIT);
  658         /*
  659          * Initialize filesystem stat information in mount struct.
  660          */
  661         MNT_ILOCK(mp);
  662         mp->mnt_kern_flag |= MNTK_MPSAFE | MNTK_LOOKUP_SHARED |
  663             MNTK_EXTENDED_SHARED;
  664         MNT_IUNLOCK(mp);
  665         return (0);
  666 out:
  667         if (bp)
  668                 brelse(bp);
  669         if (cp != NULL) {
  670                 DROP_GIANT();
  671                 g_topology_lock();
  672                 g_vfs_close(cp);
  673                 g_topology_unlock();
  674                 PICKUP_GIANT();
  675         }
  676         if (ump) {
  677                 mtx_destroy(EXT2_MTX(ump));
  678                 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT);
  679                 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT);
  680                 free(ump->um_e2fs->e2fs, M_EXT2MNT);
  681                 free(ump->um_e2fs, M_EXT2MNT);
  682                 free(ump, M_EXT2MNT);
  683                 mp->mnt_data = NULL;
  684         }
  685         return (error);
  686 }
  687 
  688 /*
  689  * Unmount system call.
  690  */
  691 static int
  692 ext2_unmount(struct mount *mp, int mntflags)
  693 {
  694         struct ext2mount *ump;
  695         struct m_ext2fs *fs;
  696         struct csum *sump;
  697         int error, flags, i, ronly;
  698 
  699         flags = 0;
  700         if (mntflags & MNT_FORCE) {
  701                 if (mp->mnt_flag & MNT_ROOTFS)
  702                         return (EINVAL);
  703                 flags |= FORCECLOSE;
  704         }
  705         if ((error = ext2_flushfiles(mp, flags, curthread)) != 0)
  706                 return (error);
  707         ump = VFSTOEXT2(mp);
  708         fs = ump->um_e2fs;
  709         ronly = fs->e2fs_ronly;
  710         if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) {
  711                 if (fs->e2fs_wasvalid)
  712                         fs->e2fs->e2fs_state |= E2FS_ISCLEAN;
  713                 ext2_sbupdate(ump, MNT_WAIT);
  714         }
  715 
  716         DROP_GIANT();
  717         g_topology_lock();
  718         g_vfs_close(ump->um_cp);
  719         g_topology_unlock();
  720         PICKUP_GIANT();
  721         vrele(ump->um_devvp);
  722         sump = fs->e2fs_clustersum;
  723         for (i = 0; i < fs->e2fs_gcount; i++, sump++)
  724                 free(sump->cs_sum, M_EXT2MNT);
  725         free(fs->e2fs_clustersum, M_EXT2MNT);
  726         free(fs->e2fs_maxcluster, M_EXT2MNT);
  727         free(fs->e2fs_gd, M_EXT2MNT);
  728         free(fs->e2fs_contigdirs, M_EXT2MNT);
  729         free(fs->e2fs, M_EXT2MNT);
  730         free(fs, M_EXT2MNT);
  731         free(ump, M_EXT2MNT);
  732         mp->mnt_data = NULL;
  733         MNT_ILOCK(mp);
  734         mp->mnt_flag &= ~MNT_LOCAL;
  735         MNT_IUNLOCK(mp);
  736         return (error);
  737 }
  738 
  739 /*
  740  * Flush out all the files in a filesystem.
  741  */
  742 static int
  743 ext2_flushfiles(struct mount *mp, int flags, struct thread *td)
  744 {
  745         int error;
  746 
  747         error = vflush(mp, 0, flags, td);
  748         return (error);
  749 }
  750 /*
  751  * Get filesystem statistics.
  752  */
  753 int
  754 ext2_statfs(struct mount *mp, struct statfs *sbp)
  755 {
  756         struct ext2mount *ump;
  757         struct m_ext2fs *fs;
  758         uint32_t overhead, overhead_per_group, ngdb;
  759         int i, ngroups;
  760 
  761         ump = VFSTOEXT2(mp);
  762         fs = ump->um_e2fs;
  763         if (fs->e2fs->e2fs_magic != E2FS_MAGIC)
  764                 panic("ext2_statfs");
  765 
  766         /*
  767          * Compute the overhead (FS structures)
  768          */
  769         overhead_per_group =
  770             1 /* block bitmap */ +
  771             1 /* inode bitmap */ +
  772             fs->e2fs_itpg;
  773         overhead = fs->e2fs->e2fs_first_dblock +
  774             fs->e2fs_gcount * overhead_per_group;
  775         if (fs->e2fs->e2fs_rev > E2FS_REV0 &&
  776             fs->e2fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) {
  777                 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) {
  778                         if (cg_has_sb(i))
  779                                 ngroups++;
  780                 }
  781         } else {
  782                 ngroups = fs->e2fs_gcount;
  783         }
  784         ngdb = fs->e2fs_gdbcount;
  785         if (fs->e2fs->e2fs_rev > E2FS_REV0 &&
  786             fs->e2fs->e2fs_features_compat & EXT2F_COMPAT_RESIZE)
  787                 ngdb += fs->e2fs->e2fs_reserved_ngdb;
  788         overhead += ngroups * (1 /* superblock */ + ngdb);
  789 
  790         sbp->f_bsize = EXT2_FRAG_SIZE(fs);
  791         sbp->f_iosize = EXT2_BLOCK_SIZE(fs);
  792         sbp->f_blocks = fs->e2fs->e2fs_bcount - overhead;
  793         sbp->f_bfree = fs->e2fs->e2fs_fbcount;
  794         sbp->f_bavail = sbp->f_bfree - fs->e2fs->e2fs_rbcount;
  795         sbp->f_files = fs->e2fs->e2fs_icount;
  796         sbp->f_ffree = fs->e2fs->e2fs_ficount;
  797         return (0);
  798 }
  799 
  800 /*
  801  * Go through the disk queues to initiate sandbagged IO;
  802  * go through the inodes to write those that have been modified;
  803  * initiate the writing of the super block if it has been modified.
  804  *
  805  * Note: we are always called with the filesystem marked `MPBUSY'.
  806  */
  807 static int
  808 ext2_sync(struct mount *mp, int waitfor)
  809 {
  810         struct vnode *mvp, *vp;
  811         struct thread *td;
  812         struct inode *ip;
  813         struct ext2mount *ump = VFSTOEXT2(mp);
  814         struct m_ext2fs *fs;
  815         int error, allerror = 0;
  816 
  817         td = curthread;
  818         fs = ump->um_e2fs;
  819         if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) {                /* XXX */
  820                 printf("fs = %s\n", fs->e2fs_fsmnt);
  821                 panic("ext2_sync: rofs mod");
  822         }
  823 
  824         /*
  825          * Write back each (modified) inode.
  826          */
  827 loop:
  828         MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
  829                 if (vp->v_type == VNON) {
  830                         VI_UNLOCK(vp);
  831                         continue;
  832                 }
  833                 ip = VTOI(vp);
  834                 if ((ip->i_flag &
  835                     (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
  836                     (vp->v_bufobj.bo_dirty.bv_cnt == 0 ||
  837                     waitfor == MNT_LAZY)) {
  838                         VI_UNLOCK(vp);
  839                         continue;
  840                 }
  841                 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td);
  842                 if (error) {
  843                         if (error == ENOENT) {
  844                                 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
  845                                 goto loop;
  846                         }
  847                         continue;
  848                 }
  849                 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0)
  850                         allerror = error;
  851                 VOP_UNLOCK(vp, 0);
  852                 vrele(vp);
  853         }
  854 
  855         /*
  856          * Force stale filesystem control information to be flushed.
  857          */
  858         if (waitfor != MNT_LAZY) {
  859                 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
  860                 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0)
  861                         allerror = error;
  862                 VOP_UNLOCK(ump->um_devvp, 0);
  863         }
  864 
  865         /*
  866          * Write back modified superblock.
  867          */
  868         if (fs->e2fs_fmod != 0) {
  869                 fs->e2fs_fmod = 0;
  870                 fs->e2fs->e2fs_wtime = time_second;
  871                 if ((error = ext2_cgupdate(ump, waitfor)) != 0)
  872                         allerror = error;
  873         }
  874         return (allerror);
  875 }
  876 
  877 /*
  878  * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it
  879  * in from disk.  If it is in core, wait for the lock bit to clear, then
  880  * return the inode locked.  Detection and handling of mount points must be
  881  * done by the calling routine.
  882  */
  883 static int
  884 ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
  885 {
  886         struct m_ext2fs *fs;
  887         struct inode *ip;
  888         struct ext2mount *ump;
  889         struct buf *bp;
  890         struct vnode *vp;
  891         struct cdev *dev;
  892         struct thread *td;
  893         int i, error;
  894         int used_blocks;
  895 
  896         td = curthread;
  897         error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL);
  898         if (error || *vpp != NULL)
  899                 return (error);
  900 
  901         ump = VFSTOEXT2(mp);
  902         dev = ump->um_dev;
  903 
  904         /*
  905          * If this malloc() is performed after the getnewvnode()
  906          * it might block, leaving a vnode with a NULL v_data to be
  907          * found by ext2_sync() if a sync happens to fire right then,
  908          * which will cause a panic because ext2_sync() blindly
  909          * dereferences vp->v_data (as well it should).
  910          */
  911         ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO);
  912 
  913         /* Allocate a new vnode/inode. */
  914         if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) {
  915                 *vpp = NULL;
  916                 free(ip, M_EXT2NODE);
  917                 return (error);
  918         }
  919         vp->v_data = ip;
  920         ip->i_vnode = vp;
  921         ip->i_e2fs = fs = ump->um_e2fs;
  922         ip->i_ump  = ump;
  923         ip->i_number = ino;
  924 
  925         lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
  926         error = insmntque(vp, mp);
  927         if (error != 0) {
  928                 free(ip, M_EXT2NODE);
  929                 *vpp = NULL;
  930                 return (error);
  931         }
  932         error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL);
  933         if (error || *vpp != NULL)
  934                 return (error);
  935 
  936         /* Read in the disk contents for the inode, copy into the inode. */
  937         if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
  938             (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) {
  939                 /*
  940                  * The inode does not contain anything useful, so it would
  941                  * be misleading to leave it on its hash chain. With mode
  942                  * still zero, it will be unlinked and returned to the free
  943                  * list by vput().
  944                  */
  945                 brelse(bp);
  946                 vput(vp);
  947                 *vpp = NULL;
  948                 return (error);
  949         }
  950         /* convert ext2 inode to dinode */
  951         ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data + EXT2_INODE_SIZE(fs) *
  952                         ino_to_fsbo(fs, ino)), ip);
  953         ip->i_block_group = ino_to_cg(fs, ino);
  954         ip->i_next_alloc_block = 0;
  955         ip->i_next_alloc_goal = 0;
  956 
  957         /*
  958          * Now we want to make sure that block pointers for unused
  959          * blocks are zeroed out - ext2_balloc depends on this
  960          * although for regular files and directories only
  961          */
  962         if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) {
  963                 used_blocks = (ip->i_size+fs->e2fs_bsize-1) / fs->e2fs_bsize;
  964                 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
  965                         ip->i_db[i] = 0;
  966         }
  967 /*
  968         ext2_print_inode(ip);
  969 */
  970         bqrelse(bp);
  971 
  972         /*
  973          * Initialize the vnode from the inode, check for aliases.
  974          * Note that the underlying vnode may have changed.
  975          */
  976         if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) {
  977                 vput(vp);
  978                 *vpp = NULL;
  979                 return (error);
  980         }
  981 
  982         /*
  983          * Finish inode initialization.
  984          */
  985 
  986         /*
  987          * Set up a generation number for this inode if it does not
  988          * already have one. This should only happen on old filesystems.
  989          */
  990         if (ip->i_gen == 0) {
  991                 ip->i_gen = random() / 2 + 1;
  992                 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
  993                         ip->i_flag |= IN_MODIFIED;
  994         }
  995         *vpp = vp;
  996         return (0);
  997 }
  998 
  999 /*
 1000  * File handle to vnode
 1001  *
 1002  * Have to be really careful about stale file handles:
 1003  * - check that the inode number is valid
 1004  * - call ext2_vget() to get the locked inode
 1005  * - check for an unallocated inode (i_mode == 0)
 1006  * - check that the given client host has export rights and return
 1007  *   those rights via. exflagsp and credanonp
 1008  */
 1009 static int
 1010 ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp)
 1011 {
 1012         struct inode *ip;
 1013         struct ufid *ufhp;
 1014         struct vnode *nvp;
 1015         struct m_ext2fs *fs;
 1016         int error;
 1017 
 1018         ufhp = (struct ufid *)fhp;
 1019         fs = VFSTOEXT2(mp)->um_e2fs;
 1020         if (ufhp->ufid_ino < EXT2_ROOTINO ||
 1021             ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg)
 1022                 return (ESTALE);
 1023 
 1024         error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
 1025         if (error) {
 1026                 *vpp = NULLVP;
 1027                 return (error);
 1028         }
 1029         ip = VTOI(nvp);
 1030         if (ip->i_mode == 0 ||
 1031             ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) {
 1032                 vput(nvp);
 1033                 *vpp = NULLVP;
 1034                 return (ESTALE);
 1035         }
 1036         *vpp = nvp;
 1037         vnode_create_vobject(*vpp, 0, curthread);
 1038         return (0);
 1039 }
 1040 
 1041 /*
 1042  * Write a superblock and associated information back to disk.
 1043  */
 1044 static int
 1045 ext2_sbupdate(struct ext2mount *mp, int waitfor)
 1046 {
 1047         struct m_ext2fs *fs = mp->um_e2fs;
 1048         struct ext2fs *es = fs->e2fs;
 1049         struct buf *bp;
 1050         int error = 0;
 1051 
 1052         bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0);
 1053         bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs));
 1054         if (waitfor == MNT_WAIT)
 1055                 error = bwrite(bp);
 1056         else
 1057                 bawrite(bp);
 1058 
 1059         /*
 1060          * The buffers for group descriptors, inode bitmaps and block bitmaps
 1061          * are not busy at this point and are (hopefully) written by the
 1062          * usual sync mechanism. No need to write them here.
 1063          */
 1064         return (error);
 1065 }
 1066 int
 1067 ext2_cgupdate(struct ext2mount *mp, int waitfor)
 1068 {
 1069         struct m_ext2fs *fs = mp->um_e2fs;
 1070         struct buf *bp;
 1071         int i, error = 0, allerror = 0;
 1072 
 1073         allerror = ext2_sbupdate(mp, waitfor);
 1074         for (i = 0; i < fs->e2fs_gdbcount; i++) {
 1075                 bp = getblk(mp->um_devvp, fsbtodb(fs,
 1076                     fs->e2fs->e2fs_first_dblock +
 1077                     1 /* superblock */ + i), fs->e2fs_bsize, 0, 0, 0);
 1078                 e2fs_cgsave(&fs->e2fs_gd[
 1079                     i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
 1080                     (struct ext2_gd *)bp->b_data, fs->e2fs_bsize);
 1081                 if (waitfor == MNT_WAIT)
 1082                         error = bwrite(bp);
 1083                 else
 1084                         bawrite(bp);
 1085         }
 1086 
 1087         if (!allerror && error)
 1088                 allerror = error;
 1089         return (allerror);
 1090 }
 1091 /*
 1092  * Return the root of a filesystem.
 1093  */
 1094 static int
 1095 ext2_root(struct mount *mp, int flags, struct vnode **vpp)
 1096 {
 1097         struct vnode *nvp;
 1098         int error;
 1099 
 1100         error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp);
 1101         if (error)
 1102                 return (error);
 1103         *vpp = nvp;
 1104         return (0);
 1105 }

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