The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/ntfs/ntfs_vfsops.c

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    1 /*      $NetBSD: ntfs_vfsops.c,v 1.72.6.1 2009/09/10 07:33:24 snj Exp $ */
    2 
    3 /*-
    4  * Copyright (c) 1998, 1999 Semen Ustimenko
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  *      Id: ntfs_vfsops.c,v 1.7 1999/05/31 11:28:30 phk Exp
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __KERNEL_RCSID(0, "$NetBSD: ntfs_vfsops.c,v 1.72.6.1 2009/09/10 07:33:24 snj Exp $");
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/namei.h>
   37 #include <sys/proc.h>
   38 #include <sys/kernel.h>
   39 #include <sys/vnode.h>
   40 #include <sys/mount.h>
   41 #include <sys/buf.h>
   42 #include <sys/fcntl.h>
   43 #include <sys/malloc.h>
   44 #include <sys/sysctl.h>
   45 #include <sys/device.h>
   46 #include <sys/conf.h>
   47 #include <sys/kauth.h>
   48 #include <sys/module.h>
   49 
   50 #include <uvm/uvm_extern.h>
   51 
   52 #include <miscfs/genfs/genfs.h>
   53 #include <miscfs/specfs/specdev.h>
   54 
   55 #include <fs/ntfs/ntfs.h>
   56 #include <fs/ntfs/ntfs_inode.h>
   57 #include <fs/ntfs/ntfs_subr.h>
   58 #include <fs/ntfs/ntfs_vfsops.h>
   59 #include <fs/ntfs/ntfs_ihash.h>
   60 #include <fs/ntfs/ntfsmount.h>
   61 
   62 MODULE(MODULE_CLASS_VFS, ntfs, NULL);
   63 
   64 MALLOC_JUSTDEFINE(M_NTFSMNT, "NTFS mount", "NTFS mount structure");
   65 MALLOC_JUSTDEFINE(M_NTFSNTNODE,"NTFS ntnode",  "NTFS ntnode information");
   66 MALLOC_JUSTDEFINE(M_NTFSFNODE,"NTFS fnode",  "NTFS fnode information");
   67 MALLOC_JUSTDEFINE(M_NTFSDIR,"NTFS dir",  "NTFS dir buffer");
   68 
   69 static int      ntfs_mount(struct mount *, const char *, void *, size_t *);
   70 static int      ntfs_root(struct mount *, struct vnode **);
   71 static int      ntfs_start(struct mount *, int);
   72 static int      ntfs_statvfs(struct mount *, struct statvfs *);
   73 static int      ntfs_sync(struct mount *, int, kauth_cred_t);
   74 static int      ntfs_unmount(struct mount *, int);
   75 static int      ntfs_vget(struct mount *mp, ino_t ino,
   76                                struct vnode **vpp);
   77 static int      ntfs_mountfs(struct vnode *, struct mount *,
   78                                   struct ntfs_args *, struct lwp *);
   79 static int      ntfs_vptofh(struct vnode *, struct fid *, size_t *);
   80 
   81 static void     ntfs_init(void);
   82 static void     ntfs_reinit(void);
   83 static void     ntfs_done(void);
   84 static int      ntfs_fhtovp(struct mount *, struct fid *,
   85                                 struct vnode **);
   86 static int      ntfs_mountroot(void);
   87 
   88 static const struct genfs_ops ntfs_genfsops = {
   89         .gop_write = genfs_compat_gop_write,
   90 };
   91 
   92 static struct sysctllog *ntfs_sysctl_log;
   93 
   94 static int
   95 ntfs_mountroot()
   96 {
   97         struct mount *mp;
   98         struct lwp *l = curlwp; /* XXX */
   99         int error;
  100         struct ntfs_args args;
  101 
  102         if (device_class(root_device) != DV_DISK)
  103                 return (ENODEV);
  104 
  105         if ((error = vfs_rootmountalloc(MOUNT_NTFS, "root_device", &mp))) {
  106                 vrele(rootvp);
  107                 return (error);
  108         }
  109 
  110         args.flag = 0;
  111         args.uid = 0;
  112         args.gid = 0;
  113         args.mode = 0777;
  114 
  115         if ((error = ntfs_mountfs(rootvp, mp, &args, l)) != 0) {
  116                 vfs_unbusy(mp, false, NULL);
  117                 vfs_destroy(mp);
  118                 return (error);
  119         }
  120 
  121         mutex_enter(&mountlist_lock);
  122         CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
  123         mutex_exit(&mountlist_lock);
  124         (void)ntfs_statvfs(mp, &mp->mnt_stat);
  125         vfs_unbusy(mp, false, NULL);
  126         return (0);
  127 }
  128 
  129 static void
  130 ntfs_init()
  131 {
  132 
  133         malloc_type_attach(M_NTFSMNT);
  134         malloc_type_attach(M_NTFSNTNODE);
  135         malloc_type_attach(M_NTFSFNODE);
  136         malloc_type_attach(M_NTFSDIR);
  137         malloc_type_attach(M_NTFSNTVATTR);
  138         malloc_type_attach(M_NTFSRDATA);
  139         malloc_type_attach(M_NTFSDECOMP);
  140         malloc_type_attach(M_NTFSRUN);
  141         ntfs_nthashinit();
  142         ntfs_toupper_init();
  143 }
  144 
  145 static void
  146 ntfs_reinit()
  147 {
  148         ntfs_nthashreinit();
  149 }
  150 
  151 static void
  152 ntfs_done()
  153 {
  154         ntfs_nthashdone();
  155         malloc_type_detach(M_NTFSMNT);
  156         malloc_type_detach(M_NTFSNTNODE);
  157         malloc_type_detach(M_NTFSFNODE);
  158         malloc_type_detach(M_NTFSDIR);
  159         malloc_type_detach(M_NTFSNTVATTR);
  160         malloc_type_detach(M_NTFSRDATA);
  161         malloc_type_detach(M_NTFSDECOMP);
  162         malloc_type_detach(M_NTFSRUN);
  163 }
  164 
  165 static int
  166 ntfs_mount (
  167         struct mount *mp,
  168         const char *path,
  169         void *data,
  170         size_t *data_len)
  171 {
  172         struct nameidata nd;
  173         struct lwp *l = curlwp;
  174         struct nameidata *ndp = &nd;
  175         int             err = 0, flags;
  176         struct vnode    *devvp;
  177         struct ntfs_args *args = data;
  178 
  179         if (*data_len < sizeof *args)
  180                 return EINVAL;
  181 
  182         if (mp->mnt_flag & MNT_GETARGS) {
  183                 struct ntfsmount *ntmp = VFSTONTFS(mp);
  184                 if (ntmp == NULL)
  185                         return EIO;
  186                 args->fspec = NULL;
  187                 args->uid = ntmp->ntm_uid;
  188                 args->gid = ntmp->ntm_gid;
  189                 args->mode = ntmp->ntm_mode;
  190                 args->flag = ntmp->ntm_flag;
  191                 *data_len = sizeof *args;
  192                 return 0;
  193         }
  194         /*
  195          ***
  196          * Mounting non-root file system or updating a file system
  197          ***
  198          */
  199 
  200         /*
  201          * If updating, check whether changing from read-only to
  202          * read/write; if there is no device name, that's all we do.
  203          */
  204         if (mp->mnt_flag & MNT_UPDATE) {
  205                 printf("ntfs_mount(): MNT_UPDATE not supported\n");
  206                 return (EINVAL);
  207         }
  208 
  209         /*
  210          * Not an update, or updating the name: look up the name
  211          * and verify that it refers to a sensible block device.
  212          */
  213         NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args->fspec);
  214         err = namei(ndp);
  215         if (err) {
  216                 /* can't get devvp!*/
  217                 return (err);
  218         }
  219 
  220         devvp = ndp->ni_vp;
  221 
  222         if (devvp->v_type != VBLK) {
  223                 err = ENOTBLK;
  224                 goto fail;
  225         }
  226         if (bdevsw_lookup(devvp->v_rdev) == NULL) {
  227                 err = ENXIO;
  228                 goto fail;
  229         }
  230         if (mp->mnt_flag & MNT_UPDATE) {
  231 #if 0
  232                 /*
  233                  ********************
  234                  * UPDATE
  235                  ********************
  236                  */
  237 
  238                 if (devvp != ntmp->um_devvp) {
  239                         err = EINVAL;   /* needs translation */
  240                         goto fail;
  241                 }
  242 
  243                 /*
  244                  * Update device name only on success
  245                  */
  246                 err = set_statvfs_info(NULL, UIO_USERSPACE, args->fspec,
  247                     UIO_USERSPACE, mp->mnt_op->vfs_name, mp, p);
  248                 if (err)
  249                         goto fail;
  250 
  251                 vrele(devvp);
  252 #endif
  253         } else {
  254                 /*
  255                  ********************
  256                  * NEW MOUNT
  257                  ********************
  258                  */
  259 
  260                 /*
  261                  * Since this is a new mount, we want the names for
  262                  * the device and the mount point copied in.  If an
  263                  * error occurs,  the mountpoint is discarded by the
  264                  * upper level code.
  265                  */
  266 
  267                 /* Save "last mounted on" info for mount point (NULL pad)*/
  268                 err = set_statvfs_info(path, UIO_USERSPACE, args->fspec,
  269                     UIO_USERSPACE, mp->mnt_op->vfs_name, mp, l);
  270                 if (err)
  271                         goto fail;
  272 
  273                 if (mp->mnt_flag & MNT_RDONLY)
  274                         flags = FREAD;
  275                 else
  276                         flags = FREAD|FWRITE;
  277                 err = VOP_OPEN(devvp, flags, FSCRED);
  278                 if (err)
  279                         goto fail;
  280                 err = ntfs_mountfs(devvp, mp, args, l);
  281                 if (err) {
  282                         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
  283                         (void)VOP_CLOSE(devvp, flags, NOCRED);
  284                         VOP_UNLOCK(devvp, 0);
  285                         goto fail;
  286                 }
  287         }
  288 
  289         /*
  290          * Initialize FS stat information in mount struct; uses both
  291          * mp->mnt_stat.f_mntonname and mp->mnt_stat.f_mntfromname
  292          *
  293          * This code is common to root and non-root mounts
  294          */
  295         (void)VFS_STATVFS(mp, &mp->mnt_stat);
  296         return (err);
  297 
  298 fail:
  299         vrele(devvp);
  300         return (err);
  301 }
  302 
  303 /*
  304  * Common code for mount and mountroot
  305  */
  306 int
  307 ntfs_mountfs(devvp, mp, argsp, l)
  308         struct vnode *devvp;
  309         struct mount *mp;
  310         struct ntfs_args *argsp;
  311         struct lwp *l;
  312 {
  313         struct buf *bp;
  314         struct ntfsmount *ntmp;
  315         dev_t dev = devvp->v_rdev;
  316         int error, ronly, i;
  317         struct vnode *vp;
  318 
  319         ntmp = NULL;
  320 
  321         /*
  322          * Flush out any old buffers remaining from a previous use.
  323          */
  324         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
  325         error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0);
  326         VOP_UNLOCK(devvp, 0);
  327         if (error)
  328                 return (error);
  329 
  330         ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
  331 
  332         bp = NULL;
  333 
  334         error = bread(devvp, BBLOCK, BBSIZE, NOCRED, 0, &bp);
  335         if (error)
  336                 goto out;
  337         ntmp = malloc( sizeof *ntmp, M_NTFSMNT, M_WAITOK );
  338         bzero( ntmp, sizeof *ntmp );
  339         bcopy( bp->b_data, &ntmp->ntm_bootfile, sizeof(struct bootfile) );
  340         brelse( bp , 0 );
  341         bp = NULL;
  342 
  343         if (strncmp(ntmp->ntm_bootfile.bf_sysid, NTFS_BBID, NTFS_BBIDLEN)) {
  344                 error = EINVAL;
  345                 dprintf(("ntfs_mountfs: invalid boot block\n"));
  346                 goto out;
  347         }
  348 
  349         {
  350                 int8_t cpr = ntmp->ntm_mftrecsz;
  351                 if( cpr > 0 )
  352                         ntmp->ntm_bpmftrec = ntmp->ntm_spc * cpr;
  353                 else
  354                         ntmp->ntm_bpmftrec = (1 << (-cpr)) / ntmp->ntm_bps;
  355         }
  356         dprintf(("ntfs_mountfs(): bps: %d, spc: %d, media: %x, mftrecsz: %d (%d sects)\n",
  357                 ntmp->ntm_bps,ntmp->ntm_spc,ntmp->ntm_bootfile.bf_media,
  358                 ntmp->ntm_mftrecsz,ntmp->ntm_bpmftrec));
  359         dprintf(("ntfs_mountfs(): mftcn: 0x%x|0x%x\n",
  360                 (u_int32_t)ntmp->ntm_mftcn,(u_int32_t)ntmp->ntm_mftmirrcn));
  361 
  362         ntmp->ntm_mountp = mp;
  363         ntmp->ntm_dev = dev;
  364         ntmp->ntm_devvp = devvp;
  365         ntmp->ntm_uid = argsp->uid;
  366         ntmp->ntm_gid = argsp->gid;
  367         ntmp->ntm_mode = argsp->mode;
  368         ntmp->ntm_flag = argsp->flag;
  369         mp->mnt_data = ntmp;
  370 
  371         /* set file name encode/decode hooks XXX utf-8 only for now */
  372         ntmp->ntm_wget = ntfs_utf8_wget;
  373         ntmp->ntm_wput = ntfs_utf8_wput;
  374         ntmp->ntm_wcmp = ntfs_utf8_wcmp;
  375 
  376         dprintf(("ntfs_mountfs(): case-%s,%s uid: %d, gid: %d, mode: %o\n",
  377                 (ntmp->ntm_flag & NTFS_MFLAG_CASEINS)?"insens.":"sens.",
  378                 (ntmp->ntm_flag & NTFS_MFLAG_ALLNAMES)?" allnames,":"",
  379                 ntmp->ntm_uid, ntmp->ntm_gid, ntmp->ntm_mode));
  380 
  381         /*
  382          * We read in some system nodes to do not allow
  383          * reclaim them and to have everytime access to them.
  384          */
  385         {
  386                 int pi[3] = { NTFS_MFTINO, NTFS_ROOTINO, NTFS_BITMAPINO };
  387                 for (i=0; i<3; i++) {
  388                         error = VFS_VGET(mp, pi[i], &(ntmp->ntm_sysvn[pi[i]]));
  389                         if(error)
  390                                 goto out1;
  391                         ntmp->ntm_sysvn[pi[i]]->v_vflag |= VV_SYSTEM;
  392                         VREF(ntmp->ntm_sysvn[pi[i]]);
  393                         vput(ntmp->ntm_sysvn[pi[i]]);
  394                 }
  395         }
  396 
  397         /* read the Unicode lowercase --> uppercase translation table,
  398          * if necessary */
  399         if ((error = ntfs_toupper_use(mp, ntmp)))
  400                 goto out1;
  401 
  402         /*
  403          * Scan $BitMap and count free clusters
  404          */
  405         error = ntfs_calccfree(ntmp, &ntmp->ntm_cfree);
  406         if(error)
  407                 goto out1;
  408 
  409         /*
  410          * Read and translate to internal format attribute
  411          * definition file.
  412          */
  413         {
  414                 int num,j;
  415                 struct attrdef ad;
  416 
  417                 /* Open $AttrDef */
  418                 error = VFS_VGET(mp, NTFS_ATTRDEFINO, &vp );
  419                 if(error)
  420                         goto out1;
  421 
  422                 /* Count valid entries */
  423                 for(num=0;;num++) {
  424                         error = ntfs_readattr(ntmp, VTONT(vp),
  425                                         NTFS_A_DATA, NULL,
  426                                         num * sizeof(ad), sizeof(ad),
  427                                         &ad, NULL);
  428                         if (error)
  429                                 goto out1;
  430                         if (ad.ad_name[0] == 0)
  431                                 break;
  432                 }
  433 
  434                 /* Alloc memory for attribute definitions */
  435                 ntmp->ntm_ad = (struct ntvattrdef *) malloc(
  436                         num * sizeof(struct ntvattrdef),
  437                         M_NTFSMNT, M_WAITOK);
  438 
  439                 ntmp->ntm_adnum = num;
  440 
  441                 /* Read them and translate */
  442                 for(i=0;i<num;i++){
  443                         error = ntfs_readattr(ntmp, VTONT(vp),
  444                                         NTFS_A_DATA, NULL,
  445                                         i * sizeof(ad), sizeof(ad),
  446                                         &ad, NULL);
  447                         if (error)
  448                                 goto out1;
  449                         j = 0;
  450                         do {
  451                                 ntmp->ntm_ad[i].ad_name[j] = ad.ad_name[j];
  452                         } while(ad.ad_name[j++]);
  453                         ntmp->ntm_ad[i].ad_namelen = j - 1;
  454                         ntmp->ntm_ad[i].ad_type = ad.ad_type;
  455                 }
  456 
  457                 vput(vp);
  458         }
  459 
  460         mp->mnt_stat.f_fsidx.__fsid_val[0] = dev;
  461         mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_NTFS);
  462         mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0];
  463         mp->mnt_stat.f_namemax = NTFS_MAXFILENAME;
  464         mp->mnt_flag |= MNT_LOCAL;
  465         devvp->v_specmountpoint = mp;
  466         return (0);
  467 
  468 out1:
  469         for(i=0;i<NTFS_SYSNODESNUM;i++)
  470                 if(ntmp->ntm_sysvn[i]) vrele(ntmp->ntm_sysvn[i]);
  471 
  472         if (vflush(mp,NULLVP,0)) {
  473                 dprintf(("ntfs_mountfs: vflush failed\n"));
  474         }
  475 out:
  476         devvp->v_specmountpoint = NULL;
  477         if (bp)
  478                 brelse(bp, 0);
  479 
  480         if (error) {
  481                 if (ntmp) {
  482                         if (ntmp->ntm_ad)
  483                                 free(ntmp->ntm_ad, M_NTFSMNT);
  484                         free(ntmp, M_NTFSMNT);
  485                 }
  486         }
  487 
  488         return (error);
  489 }
  490 
  491 static int
  492 ntfs_start (
  493         struct mount *mp,
  494         int flags)
  495 {
  496         return (0);
  497 }
  498 
  499 static int
  500 ntfs_unmount(
  501         struct mount *mp,
  502         int mntflags)
  503 {
  504         struct lwp *l = curlwp;
  505         struct ntfsmount *ntmp;
  506         int error, ronly = 0, flags, i;
  507 
  508         dprintf(("ntfs_unmount: unmounting...\n"));
  509         ntmp = VFSTONTFS(mp);
  510 
  511         flags = 0;
  512         if(mntflags & MNT_FORCE)
  513                 flags |= FORCECLOSE;
  514 
  515         dprintf(("ntfs_unmount: vflushing...\n"));
  516         error = vflush(mp,NULLVP,flags | SKIPSYSTEM);
  517         if (error) {
  518                 dprintf(("ntfs_unmount: vflush failed: %d\n",error));
  519                 return (error);
  520         }
  521 
  522         /* Check if only system vnodes are rest */
  523         for(i=0;i<NTFS_SYSNODESNUM;i++)
  524                  if((ntmp->ntm_sysvn[i]) &&
  525                     (ntmp->ntm_sysvn[i]->v_usecount > 1)) return (EBUSY);
  526 
  527         /* Dereference all system vnodes */
  528         for(i=0;i<NTFS_SYSNODESNUM;i++)
  529                  if(ntmp->ntm_sysvn[i]) vrele(ntmp->ntm_sysvn[i]);
  530 
  531         /* vflush system vnodes */
  532         error = vflush(mp,NULLVP,flags);
  533         if (error) {
  534                 panic("ntfs_unmount: vflush failed(sysnodes): %d\n",error);
  535         }
  536 
  537         /* Check if the type of device node isn't VBAD before
  538          * touching v_specinfo.  If the device vnode is revoked, the
  539          * field is NULL and touching it causes null pointer derefercence.
  540          */
  541         if (ntmp->ntm_devvp->v_type != VBAD)
  542                 ntmp->ntm_devvp->v_specmountpoint = NULL;
  543 
  544         vinvalbuf(ntmp->ntm_devvp, V_SAVE, NOCRED, l, 0, 0);
  545 
  546         /* lock the device vnode before calling VOP_CLOSE() */
  547         vn_lock(ntmp->ntm_devvp, LK_EXCLUSIVE | LK_RETRY);
  548         error = VOP_CLOSE(ntmp->ntm_devvp, ronly ? FREAD : FREAD|FWRITE,
  549                 NOCRED);
  550         KASSERT(error == 0);
  551         VOP_UNLOCK(ntmp->ntm_devvp, 0);
  552 
  553         vrele(ntmp->ntm_devvp);
  554 
  555         /* free the toupper table, if this has been last mounted ntfs volume */
  556         ntfs_toupper_unuse();
  557 
  558         dprintf(("ntfs_umount: freeing memory...\n"));
  559         mp->mnt_data = NULL;
  560         mp->mnt_flag &= ~MNT_LOCAL;
  561         free(ntmp->ntm_ad, M_NTFSMNT);
  562         FREE(ntmp, M_NTFSMNT);
  563         return (0);
  564 }
  565 
  566 static int
  567 ntfs_root(
  568         struct mount *mp,
  569         struct vnode **vpp)
  570 {
  571         struct vnode *nvp;
  572         int error = 0;
  573 
  574         dprintf(("ntfs_root(): sysvn: %p\n",
  575                 VFSTONTFS(mp)->ntm_sysvn[NTFS_ROOTINO]));
  576         error = VFS_VGET(mp, (ino_t)NTFS_ROOTINO, &nvp);
  577         if(error) {
  578                 printf("ntfs_root: VFS_VGET failed: %d\n",error);
  579                 return (error);
  580         }
  581 
  582         *vpp = nvp;
  583         return (0);
  584 }
  585 
  586 int
  587 ntfs_calccfree(
  588         struct ntfsmount *ntmp,
  589         cn_t *cfreep)
  590 {
  591         struct vnode *vp;
  592         u_int8_t *tmp;
  593         int j, error;
  594         cn_t cfree = 0;
  595         size_t bmsize, i;
  596 
  597         vp = ntmp->ntm_sysvn[NTFS_BITMAPINO];
  598 
  599         bmsize = VTOF(vp)->f_size;
  600 
  601         tmp = (u_int8_t *) malloc(bmsize, M_TEMP, M_WAITOK);
  602 
  603         error = ntfs_readattr(ntmp, VTONT(vp), NTFS_A_DATA, NULL,
  604                                0, bmsize, tmp, NULL);
  605         if (error)
  606                 goto out;
  607 
  608         for(i=0;i<bmsize;i++)
  609                 for(j=0;j<8;j++)
  610                         if(~tmp[i] & (1 << j)) cfree++;
  611         *cfreep = cfree;
  612 
  613     out:
  614         free(tmp, M_TEMP);
  615         return(error);
  616 }
  617 
  618 static int
  619 ntfs_statvfs(
  620         struct mount *mp,
  621         struct statvfs *sbp)
  622 {
  623         struct ntfsmount *ntmp = VFSTONTFS(mp);
  624         u_int64_t mftallocated;
  625 
  626         dprintf(("ntfs_statvfs():\n"));
  627 
  628         mftallocated = VTOF(ntmp->ntm_sysvn[NTFS_MFTINO])->f_allocated;
  629 
  630         sbp->f_bsize = ntmp->ntm_bps;
  631         sbp->f_frsize = sbp->f_bsize; /* XXX */
  632         sbp->f_iosize = ntmp->ntm_bps * ntmp->ntm_spc;
  633         sbp->f_blocks = ntmp->ntm_bootfile.bf_spv;
  634         sbp->f_bfree = sbp->f_bavail = ntfs_cntobn(ntmp->ntm_cfree);
  635         sbp->f_ffree = sbp->f_favail = sbp->f_bfree / ntmp->ntm_bpmftrec;
  636         sbp->f_files = mftallocated / ntfs_bntob(ntmp->ntm_bpmftrec) +
  637             sbp->f_ffree;
  638         sbp->f_fresvd = sbp->f_bresvd = 0; /* XXX */
  639         sbp->f_flag = mp->mnt_flag;
  640         copy_statvfs_info(sbp, mp);
  641         return (0);
  642 }
  643 
  644 static int
  645 ntfs_sync (
  646         struct mount *mp,
  647         int waitfor,
  648         kauth_cred_t cred)
  649 {
  650         /*dprintf(("ntfs_sync():\n"));*/
  651         return (0);
  652 }
  653 
  654 /*ARGSUSED*/
  655 static int
  656 ntfs_fhtovp(
  657         struct mount *mp,
  658         struct fid *fhp,
  659         struct vnode **vpp)
  660 {
  661         struct ntfid ntfh;
  662         int error;
  663 
  664         if (fhp->fid_len != sizeof(struct ntfid))
  665                 return EINVAL;
  666         memcpy(&ntfh, fhp, sizeof(ntfh));
  667         ddprintf(("ntfs_fhtovp(): %s: %llu\n", mp->mnt_stat.f_mntonname,
  668             (unsigned long long)ntfh.ntfid_ino));
  669 
  670         error = ntfs_vgetex(mp, ntfh.ntfid_ino, ntfh.ntfid_attr, NULL,
  671                         LK_EXCLUSIVE | LK_RETRY, 0, vpp);
  672         if (error != 0) {
  673                 *vpp = NULLVP;
  674                 return (error);
  675         }
  676 
  677         /* XXX as unlink/rmdir/mkdir/creat are not currently possible
  678          * with NTFS, we don't need to check anything else for now */
  679         return (0);
  680 }
  681 
  682 static int
  683 ntfs_vptofh(
  684         struct vnode *vp,
  685         struct fid *fhp,
  686         size_t *fh_size)
  687 {
  688         struct ntnode *ntp;
  689         struct ntfid ntfh;
  690         struct fnode *fn;
  691 
  692         if (*fh_size < sizeof(struct ntfid)) {
  693                 *fh_size = sizeof(struct ntfid);
  694                 return E2BIG;
  695         }
  696         *fh_size = sizeof(struct ntfid);
  697 
  698         ddprintf(("ntfs_fhtovp(): %s: %p\n", vp->v_mount->mnt_stat.f_mntonname,
  699                 vp));
  700 
  701         fn = VTOF(vp);
  702         ntp = VTONT(vp);
  703         memset(&ntfh, 0, sizeof(ntfh));
  704         ntfh.ntfid_len = sizeof(struct ntfid);
  705         ntfh.ntfid_ino = ntp->i_number;
  706         ntfh.ntfid_attr = fn->f_attrtype;
  707 #ifdef notyet
  708         ntfh.ntfid_gen = ntp->i_gen;
  709 #endif
  710         memcpy(fhp, &ntfh, sizeof(ntfh));
  711         return (0);
  712 }
  713 
  714 int
  715 ntfs_vgetex(
  716         struct mount *mp,
  717         ino_t ino,
  718         u_int32_t attrtype,
  719         char *attrname,
  720         u_long lkflags,
  721         u_long flags,
  722         struct vnode **vpp)
  723 {
  724         int error;
  725         struct ntfsmount *ntmp;
  726         struct ntnode *ip;
  727         struct fnode *fp;
  728         struct vnode *vp;
  729         enum vtype f_type = VBAD;
  730 
  731         dprintf(("ntfs_vgetex: ino: %llu, attr: 0x%x:%s, lkf: 0x%lx, f:"
  732             " 0x%lx\n", (unsigned long long)ino, attrtype,
  733             attrname ? attrname : "", (u_long)lkflags, (u_long)flags));
  734 
  735         ntmp = VFSTONTFS(mp);
  736         *vpp = NULL;
  737 
  738         /* Get ntnode */
  739         error = ntfs_ntlookup(ntmp, ino, &ip);
  740         if (error) {
  741                 printf("ntfs_vget: ntfs_ntget failed\n");
  742                 return (error);
  743         }
  744 
  745         /* It may be not initialized fully, so force load it */
  746         if (!(flags & VG_DONTLOADIN) && !(ip->i_flag & IN_LOADED)) {
  747                 error = ntfs_loadntnode(ntmp, ip);
  748                 if(error) {
  749                         printf("ntfs_vget: CAN'T LOAD ATTRIBUTES FOR INO:"
  750                             " %llu\n", (unsigned long long)ip->i_number);
  751                         ntfs_ntput(ip);
  752                         return (error);
  753                 }
  754         }
  755 
  756         error = ntfs_fget(ntmp, ip, attrtype, attrname, &fp);
  757         if (error) {
  758                 printf("ntfs_vget: ntfs_fget failed\n");
  759                 ntfs_ntput(ip);
  760                 return (error);
  761         }
  762 
  763         if (!(flags & VG_DONTVALIDFN) && !(fp->f_flag & FN_VALID)) {
  764                 if ((ip->i_frflag & NTFS_FRFLAG_DIR) &&
  765                     (fp->f_attrtype == NTFS_A_DATA && fp->f_attrname == NULL)) {
  766                         f_type = VDIR;
  767                 } else if (flags & VG_EXT) {
  768                         f_type = VNON;
  769                         fp->f_size = fp->f_allocated = 0;
  770                 } else {
  771                         f_type = VREG;
  772 
  773                         error = ntfs_filesize(ntmp, fp,
  774                                               &fp->f_size, &fp->f_allocated);
  775                         if (error) {
  776                                 ntfs_ntput(ip);
  777                                 return (error);
  778                         }
  779                 }
  780 
  781                 fp->f_flag |= FN_VALID;
  782         }
  783 
  784         /*
  785          * We may be calling vget() now. To avoid potential deadlock, we need
  786          * to release ntnode lock, since due to locking order vnode
  787          * lock has to be acquired first.
  788          * ntfs_fget() bumped ntnode usecount, so ntnode won't be recycled
  789          * prematurely.
  790          */
  791         ntfs_ntput(ip);
  792 
  793         if (FTOV(fp)) {
  794                 /* vget() returns error if the vnode has been recycled */
  795                 if (vget(FTOV(fp), lkflags) == 0) {
  796                         *vpp = FTOV(fp);
  797                         return (0);
  798                 }
  799         }
  800 
  801         error = getnewvnode(VT_NTFS, ntmp->ntm_mountp, ntfs_vnodeop_p, &vp);
  802         if(error) {
  803                 ntfs_frele(fp);
  804                 ntfs_ntput(ip);
  805                 return (error);
  806         }
  807         dprintf(("ntfs_vget: vnode: %p for ntnode: %llu\n", vp,
  808             (unsigned long long)ino));
  809 
  810         fp->f_vp = vp;
  811         vp->v_data = fp;
  812         if (f_type != VBAD)
  813                 vp->v_type = f_type;
  814         genfs_node_init(vp, &ntfs_genfsops);
  815 
  816         if (ino == NTFS_ROOTINO)
  817                 vp->v_vflag |= VV_ROOT;
  818 
  819         if (lkflags & LK_TYPE_MASK) {
  820                 error = vn_lock(vp, lkflags);
  821                 if (error) {
  822                         vput(vp);
  823                         return (error);
  824                 }
  825         }
  826 
  827         uvm_vnp_setsize(vp, fp->f_size); /* XXX: mess, cf. ntfs_lookupfile() */
  828         VREF(ip->i_devvp);
  829         *vpp = vp;
  830         return (0);
  831 }
  832 
  833 static int
  834 ntfs_vget(
  835         struct mount *mp,
  836         ino_t ino,
  837         struct vnode **vpp)
  838 {
  839         return ntfs_vgetex(mp, ino, NTFS_A_DATA, NULL,
  840                         LK_EXCLUSIVE | LK_RETRY, 0, vpp);
  841 }
  842 
  843 extern const struct vnodeopv_desc ntfs_vnodeop_opv_desc;
  844 
  845 const struct vnodeopv_desc * const ntfs_vnodeopv_descs[] = {
  846         &ntfs_vnodeop_opv_desc,
  847         NULL,
  848 };
  849 
  850 struct vfsops ntfs_vfsops = {
  851         MOUNT_NTFS,
  852         sizeof (struct ntfs_args),
  853         ntfs_mount,
  854         ntfs_start,
  855         ntfs_unmount,
  856         ntfs_root,
  857         (void *)eopnotsupp,     /* vfs_quotactl */
  858         ntfs_statvfs,
  859         ntfs_sync,
  860         ntfs_vget,
  861         ntfs_fhtovp,
  862         ntfs_vptofh,
  863         ntfs_init,
  864         ntfs_reinit,
  865         ntfs_done,
  866         ntfs_mountroot,
  867         (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp,
  868         vfs_stdextattrctl,
  869         (void *)eopnotsupp,             /* vfs_suspendctl */
  870         genfs_renamelock_enter,
  871         genfs_renamelock_exit,
  872         (void *)eopnotsupp,
  873         ntfs_vnodeopv_descs,
  874         0,
  875         { NULL, NULL },
  876 };
  877 
  878 static int
  879 ntfs_modcmd(modcmd_t cmd, void *arg)
  880 {
  881         int error;
  882 
  883         switch (cmd) {
  884         case MODULE_CMD_INIT:
  885                 error = vfs_attach(&ntfs_vfsops);
  886                 if (error != 0)
  887                         break;
  888                 sysctl_createv(&ntfs_sysctl_log, 0, NULL, NULL,
  889                                CTLFLAG_PERMANENT,
  890                                CTLTYPE_NODE, "vfs", NULL,
  891                                NULL, 0, NULL, 0,
  892                                CTL_VFS, CTL_EOL);
  893                 sysctl_createv(&ntfs_sysctl_log, 0, NULL, NULL,
  894                                CTLFLAG_PERMANENT,
  895                                CTLTYPE_NODE, "ntfs",
  896                                SYSCTL_DESCR("NTFS file system"),
  897                                NULL, 0, NULL, 0,
  898                                CTL_VFS, 20, CTL_EOL);
  899                 /*
  900                  * XXX the "20" above could be dynamic, thereby eliminating
  901                  * one more instance of the "number to vfs" mapping problem,
  902                  * but "20" is the order as taken from sys/mount.h
  903                  */
  904                 break;
  905         case MODULE_CMD_FINI:
  906                 error = vfs_detach(&ntfs_vfsops);
  907                 if (error != 0)
  908                         break;
  909                 sysctl_teardown(&ntfs_sysctl_log);
  910                 break;
  911         default:
  912                 error = ENOTTY;
  913                 break;
  914         }
  915 
  916         return (error);
  917 }

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