The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/fs/ntfs/ntfs_subr.c

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    1 /*      $NetBSD: ntfs_subr.c,v 1.37.8.1 2009/09/10 07:33:24 snj Exp $   */
    2 
    3 /*-
    4  * Copyright (c) 1998, 1999 Semen Ustimenko (semenu@FreeBSD.org)
    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_subr.c,v 1.4 1999/05/12 09:43:01 semenu Exp
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __KERNEL_RCSID(0, "$NetBSD: ntfs_subr.c,v 1.37.8.1 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/file.h>
   43 #include <sys/malloc.h>
   44 #include <sys/lock.h>
   45 #include <sys/kauth.h>
   46 
   47 #include <miscfs/specfs/specdev.h>
   48 
   49 #include <fs/ntfs/ntfs.h>
   50 #include <fs/ntfs/ntfsmount.h>
   51 #include <fs/ntfs/ntfs_inode.h>
   52 #include <fs/ntfs/ntfs_vfsops.h>
   53 #include <fs/ntfs/ntfs_subr.h>
   54 #include <fs/ntfs/ntfs_compr.h>
   55 #include <fs/ntfs/ntfs_ihash.h>
   56 
   57 #ifdef NTFS_DEBUG
   58 int ntfs_debug = NTFS_DEBUG;
   59 #endif
   60 
   61 MALLOC_JUSTDEFINE(M_NTFSNTVATTR, "NTFS vattr",
   62     "NTFS file attribute information");
   63 MALLOC_JUSTDEFINE(M_NTFSRDATA, "NTFS res data", "NTFS resident data");
   64 MALLOC_JUSTDEFINE(M_NTFSRUN, "NTFS vrun", "NTFS vrun storage");
   65 MALLOC_JUSTDEFINE(M_NTFSDECOMP, "NTFS decomp", "NTFS decompression temporary");
   66 
   67 /* Local struct used in ntfs_ntlookupfile() */
   68 struct ntfs_lookup_ctx {
   69         u_int32_t       aoff;
   70         u_int32_t       rdsize;
   71         cn_t            cn;
   72         struct ntfs_lookup_ctx *prev;
   73 };
   74 
   75 static int ntfs_ntlookupattr(struct ntfsmount *, const char *, int,
   76         int *, char **);
   77 static int ntfs_findvattr(struct ntfsmount *, struct ntnode *,
   78         struct ntvattr **, struct ntvattr **, u_int32_t, const char *,
   79         size_t, cn_t);
   80 static int ntfs_uastricmp(struct ntfsmount *, const wchar *, size_t,
   81         const char *, size_t);
   82 static int ntfs_uastrcmp(struct ntfsmount *, const wchar *, size_t,
   83         const char *, size_t);
   84 
   85 /* table for mapping Unicode chars into uppercase; it's filled upon first
   86  * ntfs mount, freed upon last ntfs umount */
   87 static wchar *ntfs_toupper_tab;
   88 #define NTFS_U28(ch)            ((((ch) & 0xE0) == 0) ? '_' : (ch) & 0xFF)
   89 #define NTFS_TOUPPER(ch)        (ntfs_toupper_tab[(unsigned char)(ch)])
   90 static kmutex_t ntfs_toupper_lock;
   91 static signed int ntfs_toupper_usecount;
   92 
   93 /* support macro for ntfs_ntvattrget() */
   94 #define NTFS_AALPCMP(aalp,type,name,namelen) (                          \
   95   (aalp->al_type == type) && (aalp->al_namelen == namelen) &&           \
   96   !ntfs_uastrcmp(ntmp, aalp->al_name,aalp->al_namelen,name,namelen) )
   97 
   98 /*
   99  *
  100  */
  101 int
  102 ntfs_ntvattrrele(vap)
  103         struct ntvattr * vap;
  104 {
  105         dprintf(("ntfs_ntvattrrele: ino: %llu, type: 0x%x\n",
  106             (unsigned long long)vap->va_ip->i_number, vap->va_type));
  107 
  108         ntfs_ntrele(vap->va_ip);
  109 
  110         return (0);
  111 }
  112 
  113 /*
  114  * find the attribute in the ntnode
  115  */
  116 static int
  117 ntfs_findvattr(ntmp, ip, lvapp, vapp, type, name, namelen, vcn)
  118         struct ntfsmount *ntmp;
  119         struct ntnode *ip;
  120         struct ntvattr **lvapp, **vapp;
  121         u_int32_t type;
  122         const char *name;
  123         size_t namelen;
  124         cn_t vcn;
  125 {
  126         int error;
  127         struct ntvattr *vap;
  128 
  129         if((ip->i_flag & IN_LOADED) == 0) {
  130                 dprintf(("ntfs_findvattr: node not loaded, ino: %llu\n",
  131                     (unsigned long long)ip->i_number));
  132                 error = ntfs_loadntnode(ntmp,ip);
  133                 if (error) {
  134                         printf("ntfs_findvattr: FAILED TO LOAD INO: %llu\n",
  135                             (unsigned long long)ip->i_number);
  136                         return (error);
  137                 }
  138         }
  139 
  140         *lvapp = NULL;
  141         *vapp = NULL;
  142         for (vap = ip->i_valist.lh_first; vap; vap = vap->va_list.le_next) {
  143                 ddprintf(("ntfs_findvattr: type: 0x%x, vcn: %qu - %qu\n",
  144                           vap->va_type, (long long) vap->va_vcnstart,
  145                           (long long) vap->va_vcnend));
  146                 if ((vap->va_type == type) &&
  147                     (vap->va_vcnstart <= vcn) && (vap->va_vcnend >= vcn) &&
  148                     (vap->va_namelen == namelen) &&
  149                     (strncmp(name, vap->va_name, namelen) == 0)) {
  150                         *vapp = vap;
  151                         ntfs_ntref(vap->va_ip);
  152                         return (0);
  153                 }
  154                 if (vap->va_type == NTFS_A_ATTRLIST)
  155                         *lvapp = vap;
  156         }
  157 
  158         return (-1);
  159 }
  160 
  161 /*
  162  * Search attribute specified in ntnode (load ntnode if necessary).
  163  * If not found but ATTR_A_ATTRLIST present, read it in and search through.
  164  * VOP_VGET node needed, and lookup through its ntnode (load if nessesary).
  165  *
  166  * ntnode should be locked
  167  */
  168 int
  169 ntfs_ntvattrget(
  170                 struct ntfsmount * ntmp,
  171                 struct ntnode * ip,
  172                 u_int32_t type,
  173                 const char *name,
  174                 cn_t vcn,
  175                 struct ntvattr ** vapp)
  176 {
  177         struct ntvattr *lvap = NULL;
  178         struct attr_attrlist *aalp;
  179         struct attr_attrlist *nextaalp;
  180         struct vnode   *newvp;
  181         struct ntnode  *newip;
  182         void *        alpool;
  183         size_t          namelen, len;
  184         int             error;
  185 
  186         *vapp = NULL;
  187 
  188         if (name) {
  189                 dprintf(("ntfs_ntvattrget: "
  190                     "ino: %llu, type: 0x%x, name: %s, vcn: %qu\n",
  191                     (unsigned long long)ip->i_number, type, name,
  192                     (long long)vcn));
  193                 namelen = strlen(name);
  194         } else {
  195                 dprintf(("ntfs_ntvattrget: "
  196                     "ino: %llu, type: 0x%x, vcn: %qu\n",
  197                     (unsigned long long)ip->i_number, type, (long long)vcn));
  198                 name = "";
  199                 namelen = 0;
  200         }
  201 
  202         error = ntfs_findvattr(ntmp, ip, &lvap, vapp, type, name, namelen, vcn);
  203         if (error >= 0)
  204                 return (error);
  205 
  206         if (!lvap) {
  207                 dprintf(("ntfs_ntvattrget: UNEXISTED ATTRIBUTE: "
  208                     "ino: %llu, type: 0x%x, name: %s, vcn: %qu\n",
  209                     (unsigned long long)ip->i_number, type, name,
  210                     (long long)vcn));
  211                 return (ENOENT);
  212         }
  213         /* Scan $ATTRIBUTE_LIST for requested attribute */
  214         len = lvap->va_datalen;
  215         alpool = (void *) malloc(len, M_TEMP, M_WAITOK);
  216         error = ntfs_readntvattr_plain(ntmp, ip, lvap, 0, len, alpool, &len,
  217                         NULL);
  218         if (error)
  219                 goto out;
  220 
  221         aalp = (struct attr_attrlist *) alpool;
  222         nextaalp = NULL;
  223 
  224         for(; len > 0; aalp = nextaalp) {
  225                 KASSERT(aalp != NULL);
  226                 dprintf(("ntfs_ntvattrget: "
  227                     "attrlist: ino: %d, attr: 0x%x, vcn: %qu\n",
  228                     aalp->al_inumber, aalp->al_type,
  229                          (long long) aalp->al_vcnstart));
  230 
  231                 if (len > aalp->reclen) {
  232                         nextaalp = NTFS_NEXTREC(aalp, struct attr_attrlist *);
  233                 } else {
  234                         nextaalp = NULL;
  235                 }
  236                 len -= aalp->reclen;
  237 
  238                 if (!NTFS_AALPCMP(aalp, type, name, namelen) ||
  239                     (nextaalp && (nextaalp->al_vcnstart <= vcn) &&
  240                      NTFS_AALPCMP(nextaalp, type, name, namelen)))
  241                         continue;
  242 
  243                 dprintf(("ntfs_ntvattrget: attribute in ino: %d\n",
  244                                  aalp->al_inumber));
  245 
  246                 /* this is not a main record, so we can't use just plain
  247                    vget() */
  248                 error = ntfs_vgetex(ntmp->ntm_mountp, aalp->al_inumber,
  249                                 NTFS_A_DATA, NULL, LK_EXCLUSIVE,
  250                                 VG_EXT, &newvp);
  251                 if (error) {
  252                         printf("ntfs_ntvattrget: CAN'T VGET INO: %d\n",
  253                                aalp->al_inumber);
  254                         goto out;
  255                 }
  256                 newip = VTONT(newvp);
  257                 /* XXX have to lock ntnode */
  258                 error = ntfs_findvattr(ntmp, newip, &lvap, vapp,
  259                                 type, name, namelen, vcn);
  260                 vput(newvp);
  261                 if (error == 0)
  262                         goto out;
  263                 printf("ntfs_ntvattrget: ATTRLIST ERROR.\n");
  264                 break;
  265         }
  266         error = ENOENT;
  267 
  268         dprintf(("ntfs_ntvattrget: UNEXISTED ATTRIBUTE: "
  269             "ino: %llu, type: 0x%x, name: %.*s, vcn: %qu\n",
  270             (unsigned long long)ip->i_number, type, (int)namelen,
  271             name, (long long)vcn));
  272 out:
  273         free(alpool, M_TEMP);
  274         return (error);
  275 }
  276 
  277 /*
  278  * Read ntnode from disk, make ntvattr list.
  279  *
  280  * ntnode should be locked
  281  */
  282 int
  283 ntfs_loadntnode(
  284               struct ntfsmount * ntmp,
  285               struct ntnode * ip)
  286 {
  287         struct filerec  *mfrp;
  288         daddr_t         bn;
  289         int             error,off;
  290         struct attr    *ap;
  291         struct ntvattr *nvap;
  292 
  293         dprintf(("ntfs_loadntnode: loading ino: %llu\n",
  294             (unsigned long long)ip->i_number));
  295 
  296         mfrp = (struct filerec *) malloc(ntfs_bntob(ntmp->ntm_bpmftrec),
  297                M_TEMP, M_WAITOK);
  298 
  299         if (ip->i_number < NTFS_SYSNODESNUM) {
  300                 struct buf     *bp;
  301 
  302                 dprintf(("ntfs_loadntnode: read system node\n"));
  303 
  304                 bn = ntfs_cntobn(ntmp->ntm_mftcn) +
  305                         ntmp->ntm_bpmftrec * ip->i_number;
  306 
  307                 error = bread(ntmp->ntm_devvp,
  308                               bn, ntfs_bntob(ntmp->ntm_bpmftrec),
  309                               NOCRED, 0, &bp);
  310                 if (error) {
  311                         printf("ntfs_loadntnode: BREAD FAILED\n");
  312                         brelse(bp, 0);
  313                         goto out;
  314                 }
  315                 memcpy(mfrp, bp->b_data, ntfs_bntob(ntmp->ntm_bpmftrec));
  316                 bqrelse(bp);
  317         } else {
  318                 struct vnode   *vp;
  319 
  320                 vp = ntmp->ntm_sysvn[NTFS_MFTINO];
  321                 error = ntfs_readattr(ntmp, VTONT(vp), NTFS_A_DATA, NULL,
  322                                ip->i_number * ntfs_bntob(ntmp->ntm_bpmftrec),
  323                                ntfs_bntob(ntmp->ntm_bpmftrec), mfrp, NULL);
  324                 if (error) {
  325                         printf("ntfs_loadntnode: ntfs_readattr failed\n");
  326                         goto out;
  327                 }
  328         }
  329 
  330         /* Check if magic and fixups are correct */
  331         error = ntfs_procfixups(ntmp, NTFS_FILEMAGIC, (void *)mfrp,
  332                                 ntfs_bntob(ntmp->ntm_bpmftrec));
  333         if (error) {
  334                 printf("ntfs_loadntnode: BAD MFT RECORD %d\n",
  335                        (u_int32_t) ip->i_number);
  336                 goto out;
  337         }
  338 
  339         dprintf(("ntfs_loadntnode: load attrs for ino: %llu\n",
  340             (unsigned long long)ip->i_number));
  341         off = mfrp->fr_attroff;
  342         ap = (struct attr *) ((char *)mfrp + off);
  343 
  344         LIST_INIT(&ip->i_valist);
  345 
  346         while (ap->a_hdr.a_type != -1) {
  347                 error = ntfs_attrtontvattr(ntmp, &nvap, ap);
  348                 if (error)
  349                         break;
  350                 nvap->va_ip = ip;
  351 
  352                 LIST_INSERT_HEAD(&ip->i_valist, nvap, va_list);
  353 
  354                 off += ap->a_hdr.reclen;
  355                 ap = (struct attr *) ((char *)mfrp + off);
  356         }
  357         if (error) {
  358                 printf("ntfs_loadntnode: failed to load attr ino: %llu\n",
  359                     (unsigned long long)ip->i_number);
  360                 goto out;
  361         }
  362 
  363         ip->i_mainrec = mfrp->fr_mainrec;
  364         ip->i_nlink = mfrp->fr_nlink;
  365         ip->i_frflag = mfrp->fr_flags;
  366 
  367         ip->i_flag |= IN_LOADED;
  368 
  369 out:
  370         free(mfrp, M_TEMP);
  371         return (error);
  372 }
  373 
  374 /*
  375  * Routine locks ntnode and increase usecount, just opposite of
  376  * ntfs_ntput().
  377  */
  378 int
  379 ntfs_ntget(ip)
  380         struct ntnode *ip;
  381 {
  382         dprintf(("ntfs_ntget: get ntnode %llu: %p, usecount: %d\n",
  383             (unsigned long long)ip->i_number, ip, ip->i_usecount));
  384 
  385         mutex_enter(&ip->i_interlock);
  386         ip->i_usecount++;
  387         while (ip->i_busy != 0) {
  388                 cv_wait(&ip->i_lock, &ip->i_interlock);
  389         }
  390         ip->i_busy = 1;
  391         mutex_exit(&ip->i_interlock);
  392 
  393         return 0;
  394 }
  395 
  396 /*
  397  * Routine search ntnode in hash, if found: lock, inc usecount and return.
  398  * If not in hash allocate structure for ntnode, prefill it, lock,
  399  * inc count and return.
  400  *
  401  * ntnode returned locked
  402  */
  403 int
  404 ntfs_ntlookup(
  405            struct ntfsmount * ntmp,
  406            ino_t ino,
  407            struct ntnode ** ipp)
  408 {
  409         struct ntnode  *ip;
  410 
  411         dprintf(("ntfs_ntlookup: looking for ntnode %llu\n",
  412             (unsigned long long)ino));
  413 
  414         if ((*ipp = ntfs_nthashlookup(ntmp->ntm_dev, ino)) != NULL) {
  415                 ntfs_ntget(*ipp);
  416                 dprintf(("ntfs_ntlookup: ntnode %llu: %p,"
  417                     " usecount: %d\n",
  418                     (unsigned long long)ino, *ipp, (*ipp)->i_usecount));
  419                 return (0);
  420         }
  421 
  422         MALLOC(ip, struct ntnode *, sizeof(struct ntnode),
  423                M_NTFSNTNODE, M_WAITOK);
  424         ddprintf(("ntfs_ntlookup: allocating ntnode: %llu: %p\n",
  425             (unsigned long long)ino, ip));
  426         bzero(ip, sizeof(struct ntnode));
  427 
  428         mutex_enter(&ntfs_hashlock);
  429         if ((*ipp = ntfs_nthashlookup(ntmp->ntm_dev, ino)) != NULL) {
  430                 mutex_exit(&ntfs_hashlock);
  431                 ntfs_ntget(*ipp);
  432                 FREE(ip, M_NTFSNTNODE);
  433                 dprintf(("ntfs_ntlookup: ntnode %llu: %p,"
  434                     " usecount: %d\n",
  435                     (unsigned long long)ino, *ipp, (*ipp)->i_usecount));
  436                 return (0);
  437         }
  438 
  439         /* Generic initialization */
  440         ip->i_devvp = ntmp->ntm_devvp;
  441         ip->i_dev = ntmp->ntm_dev;
  442         ip->i_number = ino;
  443         ip->i_mp = ntmp;
  444 
  445         LIST_INIT(&ip->i_fnlist);
  446 
  447         /* init lock and lock the newborn ntnode */
  448         cv_init(&ip->i_lock, "ntfslk");
  449         mutex_init(&ip->i_interlock, MUTEX_DEFAULT, IPL_NONE);
  450         ntfs_ntget(ip);
  451 
  452         ntfs_nthashins(ip);
  453 
  454         mutex_exit(&ntfs_hashlock);
  455 
  456         *ipp = ip;
  457 
  458         dprintf(("ntfs_ntlookup: ntnode %llu: %p, usecount: %d\n",
  459             (unsigned long long)ino, ip, ip->i_usecount));
  460 
  461         return (0);
  462 }
  463 
  464 /*
  465  * Decrement usecount of ntnode and unlock it, if usecount reach zero,
  466  * deallocate ntnode.
  467  *
  468  * ntnode should be locked on entry, and unlocked on return.
  469  */
  470 void
  471 ntfs_ntput(ip)
  472         struct ntnode *ip;
  473 {
  474         struct ntvattr *vap;
  475 
  476         dprintf(("ntfs_ntput: rele ntnode %llu: %p, usecount: %d\n",
  477             (unsigned long long)ip->i_number, ip, ip->i_usecount));
  478 
  479         mutex_enter(&ip->i_interlock);
  480         ip->i_usecount--;
  481 
  482 #ifdef DIAGNOSTIC
  483         if (ip->i_usecount < 0) {
  484                 panic("ntfs_ntput: ino: %llu usecount: %d ",
  485                     (unsigned long long)ip->i_number, ip->i_usecount);
  486         }
  487 #endif
  488 
  489         ip->i_busy = 0;
  490         cv_signal(&ip->i_lock);
  491         mutex_exit(&ip->i_interlock);
  492 
  493         if (ip->i_usecount == 0) {
  494                 dprintf(("ntfs_ntput: deallocating ntnode: %llu\n",
  495                     (unsigned long long)ip->i_number));
  496 
  497                 if (ip->i_fnlist.lh_first)
  498                         panic("ntfs_ntput: ntnode has fnodes");
  499 
  500                 ntfs_nthashrem(ip);
  501 
  502                 while (ip->i_valist.lh_first != NULL) {
  503                         vap = ip->i_valist.lh_first;
  504                         LIST_REMOVE(vap,va_list);
  505                         ntfs_freentvattr(vap);
  506                 }
  507                 mutex_destroy(&ip->i_interlock);
  508                 cv_destroy(&ip->i_lock);
  509                 FREE(ip, M_NTFSNTNODE);
  510         }
  511 }
  512 
  513 /*
  514  * increment usecount of ntnode
  515  */
  516 void
  517 ntfs_ntref(ip)
  518         struct ntnode *ip;
  519 {
  520         mutex_enter(&ip->i_interlock);
  521         ip->i_usecount++;
  522         mutex_exit(&ip->i_interlock);
  523 
  524         dprintf(("ntfs_ntref: ino %llu, usecount: %d\n",
  525             (unsigned long long)ip->i_number, ip->i_usecount));
  526 
  527 }
  528 
  529 /*
  530  * Decrement usecount of ntnode.
  531  */
  532 void
  533 ntfs_ntrele(ip)
  534         struct ntnode *ip;
  535 {
  536         dprintf(("ntfs_ntrele: rele ntnode %llu: %p, usecount: %d\n",
  537             (unsigned long long)ip->i_number, ip, ip->i_usecount));
  538 
  539         mutex_enter(&ip->i_interlock);
  540         ip->i_usecount--;
  541 
  542         if (ip->i_usecount < 0)
  543                 panic("ntfs_ntrele: ino: %llu usecount: %d ",
  544                     (unsigned long long)ip->i_number, ip->i_usecount);
  545         mutex_exit(&ip->i_interlock);
  546 }
  547 
  548 /*
  549  * Deallocate all memory allocated for ntvattr
  550  */
  551 void
  552 ntfs_freentvattr(vap)
  553         struct ntvattr * vap;
  554 {
  555         if (vap->va_flag & NTFS_AF_INRUN) {
  556                 if (vap->va_vruncn)
  557                         free(vap->va_vruncn, M_NTFSRUN);
  558                 if (vap->va_vruncl)
  559                         free(vap->va_vruncl, M_NTFSRUN);
  560         } else {
  561                 if (vap->va_datap)
  562                         free(vap->va_datap, M_NTFSRDATA);
  563         }
  564         FREE(vap, M_NTFSNTVATTR);
  565 }
  566 
  567 /*
  568  * Convert disk image of attribute into ntvattr structure,
  569  * runs are expanded also.
  570  */
  571 int
  572 ntfs_attrtontvattr(
  573                    struct ntfsmount * ntmp,
  574                    struct ntvattr ** rvapp,
  575                    struct attr * rap)
  576 {
  577         int             error, i;
  578         struct ntvattr *vap;
  579 
  580         error = 0;
  581         *rvapp = NULL;
  582 
  583         MALLOC(vap, struct ntvattr *, sizeof(struct ntvattr),
  584                 M_NTFSNTVATTR, M_WAITOK);
  585         bzero(vap, sizeof(struct ntvattr));
  586         vap->va_ip = NULL;
  587         vap->va_flag = rap->a_hdr.a_flag;
  588         vap->va_type = rap->a_hdr.a_type;
  589         vap->va_compression = rap->a_hdr.a_compression;
  590         vap->va_index = rap->a_hdr.a_index;
  591 
  592         ddprintf(("type: 0x%x, index: %d", vap->va_type, vap->va_index));
  593 
  594         vap->va_namelen = rap->a_hdr.a_namelen;
  595         if (rap->a_hdr.a_namelen) {
  596                 wchar *unp = (wchar *)((char *)rap + rap->a_hdr.a_nameoff);
  597                 ddprintf((", name:["));
  598                 for (i = 0; i < vap->va_namelen; i++) {
  599                         vap->va_name[i] = unp[i];
  600                         ddprintf(("%c", vap->va_name[i]));
  601                 }
  602                 ddprintf(("]"));
  603         }
  604         if (vap->va_flag & NTFS_AF_INRUN) {
  605                 ddprintf((", nonres."));
  606                 vap->va_datalen = rap->a_nr.a_datalen;
  607                 vap->va_allocated = rap->a_nr.a_allocated;
  608                 vap->va_vcnstart = rap->a_nr.a_vcnstart;
  609                 vap->va_vcnend = rap->a_nr.a_vcnend;
  610                 vap->va_compressalg = rap->a_nr.a_compressalg;
  611                 error = ntfs_runtovrun(&(vap->va_vruncn), &(vap->va_vruncl),
  612                                        &(vap->va_vruncnt),
  613                                        (u_int8_t *) rap + rap->a_nr.a_dataoff);
  614         } else {
  615                 vap->va_compressalg = 0;
  616                 ddprintf((", res."));
  617                 vap->va_datalen = rap->a_r.a_datalen;
  618                 vap->va_allocated = rap->a_r.a_datalen;
  619                 vap->va_vcnstart = 0;
  620                 vap->va_vcnend = ntfs_btocn(vap->va_allocated);
  621                 vap->va_datap = (void *) malloc(vap->va_datalen,
  622                        M_NTFSRDATA, M_WAITOK);
  623                 memcpy(vap->va_datap, (char *)rap + rap->a_r.a_dataoff,
  624                        rap->a_r.a_datalen);
  625         }
  626         ddprintf((", len: %qu", (long long)vap->va_datalen));
  627 
  628         if (error)
  629                 FREE(vap, M_NTFSNTVATTR);
  630         else
  631                 *rvapp = vap;
  632 
  633         ddprintf(("\n"));
  634 
  635         return (error);
  636 }
  637 
  638 /*
  639  * Expand run into more utilizable and more memory eating format.
  640  */
  641 int
  642 ntfs_runtovrun(
  643                cn_t ** rcnp,
  644                cn_t ** rclp,
  645                u_long * rcntp,
  646                u_int8_t * run)
  647 {
  648         u_int32_t       off;
  649         u_int32_t       sz, i;
  650         cn_t           *cn;
  651         cn_t           *cl;
  652         u_long          cnt;
  653         cn_t            prev;
  654         cn_t            tmp;
  655 
  656         off = 0;
  657         cnt = 0;
  658         i = 0;
  659         while (run[off]) {
  660                 off += (run[off] & 0xF) + ((run[off] >> 4) & 0xF) + 1;
  661                 cnt++;
  662         }
  663         cn = (cn_t *) malloc(cnt * sizeof(cn_t), M_NTFSRUN, M_WAITOK);
  664         cl = (cn_t *) malloc(cnt * sizeof(cn_t), M_NTFSRUN, M_WAITOK);
  665 
  666         off = 0;
  667         cnt = 0;
  668         prev = 0;
  669         while (run[off]) {
  670 
  671                 sz = run[off++];
  672                 cl[cnt] = 0;
  673 
  674                 for (i = 0; i < (sz & 0xF); i++)
  675                         cl[cnt] += (u_int32_t) run[off++] << (i << 3);
  676 
  677                 sz >>= 4;
  678                 if (run[off + sz - 1] & 0x80) {
  679                         tmp = ((u_int64_t) - 1) << (sz << 3);
  680                         for (i = 0; i < sz; i++)
  681                                 tmp |= (u_int64_t) run[off++] << (i << 3);
  682                 } else {
  683                         tmp = 0;
  684                         for (i = 0; i < sz; i++)
  685                                 tmp |= (u_int64_t) run[off++] << (i << 3);
  686                 }
  687                 if (tmp)
  688                         prev = cn[cnt] = prev + tmp;
  689                 else
  690                         cn[cnt] = tmp;
  691 
  692                 cnt++;
  693         }
  694         *rcnp = cn;
  695         *rclp = cl;
  696         *rcntp = cnt;
  697         return (0);
  698 }
  699 
  700 /*
  701  * Compare unicode and ascii string case insens.
  702  */
  703 static int
  704 ntfs_uastricmp(ntmp, ustr, ustrlen, astr, astrlen)
  705         struct ntfsmount *ntmp;
  706         const wchar *ustr;
  707         size_t ustrlen;
  708         const char *astr;
  709         size_t astrlen;
  710 {
  711         size_t  i;
  712         int res;
  713 
  714         for (i = 0; i < ustrlen && astrlen > 0; i++) {
  715                 res = (*ntmp->ntm_wcmp)(NTFS_TOUPPER(ustr[i]),
  716                     NTFS_TOUPPER((*ntmp->ntm_wget)(&astr, &astrlen)) );
  717                 if (res)
  718                         return res;
  719         }
  720 
  721         if (i == ustrlen && astrlen == 0)
  722                 return 0;
  723         else if (i == ustrlen)
  724                 return -1;
  725         else
  726                 return 1;
  727 }
  728 
  729 /*
  730  * Compare unicode and ascii string case sens.
  731  */
  732 static int
  733 ntfs_uastrcmp(ntmp, ustr, ustrlen, astr, astrlen)
  734         struct ntfsmount *ntmp;
  735         const wchar *ustr;
  736         size_t ustrlen;
  737         const char *astr;
  738         size_t astrlen;
  739 {
  740         size_t i;
  741         int res;
  742 
  743         for (i = 0; (i < ustrlen) && astrlen > 0; i++) {
  744                 res = (*ntmp->ntm_wcmp)(ustr[i],
  745                      (*ntmp->ntm_wget)(&astr, &astrlen));
  746                 if (res)
  747                         return res;
  748         }
  749 
  750         if (i == ustrlen && astrlen == 0)
  751                 return 0;
  752         else if (i == ustrlen)
  753                 return -1;
  754         else
  755                 return 1;
  756 }
  757 
  758 /*
  759  * Search fnode in ntnode, if not found allocate and preinitialize.
  760  *
  761  * ntnode should be locked on entry.
  762  */
  763 int
  764 ntfs_fget(
  765     struct ntfsmount *ntmp,
  766     struct ntnode *ip,
  767     int attrtype,
  768     char *attrname,
  769     struct fnode **fpp
  770 )
  771 {
  772         struct fnode *fp;
  773 
  774         dprintf(("ntfs_fget: ino: %llu, attrtype: 0x%x, attrname: %s\n",
  775             (unsigned long long)ip->i_number, attrtype, attrname?attrname:""));
  776         *fpp = NULL;
  777         for (fp = ip->i_fnlist.lh_first; fp != NULL; fp = fp->f_fnlist.le_next){
  778                 dprintf(("ntfs_fget: fnode: attrtype: %d, attrname: %s\n",
  779                         fp->f_attrtype, fp->f_attrname?fp->f_attrname:""));
  780 
  781                 if ((attrtype == fp->f_attrtype) &&
  782                     ((!attrname && !fp->f_attrname) ||
  783                      (attrname && fp->f_attrname &&
  784                       !strcmp(attrname,fp->f_attrname)))){
  785                         dprintf(("ntfs_fget: found existed: %p\n",fp));
  786                         *fpp = fp;
  787                 }
  788         }
  789 
  790         if (*fpp)
  791                 return (0);
  792 
  793         MALLOC(fp, struct fnode *, sizeof(struct fnode), M_NTFSFNODE, M_WAITOK);
  794         bzero(fp, sizeof(struct fnode));
  795         dprintf(("ntfs_fget: allocating fnode: %p\n",fp));
  796 
  797         fp->f_ip = ip;
  798         fp->f_attrname = attrname;
  799         if (fp->f_attrname) fp->f_flag |= FN_AATTRNAME;
  800         fp->f_attrtype = attrtype;
  801 
  802         ntfs_ntref(ip);
  803 
  804         LIST_INSERT_HEAD(&ip->i_fnlist, fp, f_fnlist);
  805 
  806         *fpp = fp;
  807 
  808         return (0);
  809 }
  810 
  811 /*
  812  * Deallocate fnode, remove it from ntnode's fnode list.
  813  *
  814  * ntnode should be locked.
  815  */
  816 void
  817 ntfs_frele(
  818         struct fnode *fp)
  819 {
  820         struct ntnode *ip = FTONT(fp);
  821 
  822         dprintf(("ntfs_frele: fnode: %p for %llu: %p\n", fp,
  823             (unsigned long long)ip->i_number, ip));
  824 
  825         dprintf(("ntfs_frele: deallocating fnode\n"));
  826         LIST_REMOVE(fp,f_fnlist);
  827         if (fp->f_flag & FN_AATTRNAME)
  828                 FREE(fp->f_attrname, M_TEMP);
  829         if (fp->f_dirblbuf)
  830                 FREE(fp->f_dirblbuf, M_NTFSDIR);
  831         FREE(fp, M_NTFSFNODE);
  832         ntfs_ntrele(ip);
  833 }
  834 
  835 /*
  836  * Lookup attribute name in format: [[:$ATTR_TYPE]:$ATTR_NAME],
  837  * $ATTR_TYPE is searched in attrdefs read from $AttrDefs.
  838  * If $ATTR_TYPE not specified, ATTR_A_DATA assumed.
  839  */
  840 static int
  841 ntfs_ntlookupattr(
  842                 struct ntfsmount * ntmp,
  843                 const char * name,
  844                 int namelen,
  845                 int *attrtype,
  846                 char **attrname)
  847 {
  848         const char *sys;
  849         size_t syslen, i;
  850         struct ntvattrdef *adp;
  851 
  852         if (namelen == 0)
  853                 return (0);
  854 
  855         if (name[0] == '$') {
  856                 sys = name;
  857                 for (syslen = 0; syslen < namelen; syslen++) {
  858                         if(sys[syslen] == ':') {
  859                                 name++;
  860                                 namelen--;
  861                                 break;
  862                         }
  863                 }
  864                 name += syslen;
  865                 namelen -= syslen;
  866 
  867                 adp = ntmp->ntm_ad;
  868                 for (i = 0; i < ntmp->ntm_adnum; i++, adp++){
  869                         if (syslen != adp->ad_namelen ||
  870                            strncmp(sys, adp->ad_name, syslen) != 0)
  871                                 continue;
  872 
  873                         *attrtype = adp->ad_type;
  874                         goto out;
  875                 }
  876                 return (ENOENT);
  877         }
  878 
  879     out:
  880         if (namelen) {
  881                 *attrname = (char *) malloc(namelen, M_TEMP, M_WAITOK);
  882                 memcpy((*attrname), name, namelen);
  883                 (*attrname)[namelen] = '\0';
  884                 *attrtype = NTFS_A_DATA;
  885         }
  886 
  887         return (0);
  888 }
  889 
  890 /*
  891  * Lookup specified node for filename, matching cnp,
  892  * return fnode filled.
  893  */
  894 int
  895 ntfs_ntlookupfile(
  896               struct ntfsmount * ntmp,
  897               struct vnode * vp,
  898               struct componentname * cnp,
  899               struct vnode ** vpp)
  900 {
  901         struct fnode   *fp = VTOF(vp);
  902         struct ntnode  *ip = FTONT(fp);
  903         struct ntvattr *vap;    /* Root attribute */
  904         cn_t            cn = 0; /* VCN in current attribute */
  905         void *        rdbuf;    /* Buffer to read directory's blocks  */
  906         u_int32_t       blsize;
  907         u_int32_t       rdsize; /* Length of data to read from current block */
  908         struct attr_indexentry *iep;
  909         int             error, res, anamelen, fnamelen;
  910         const char     *fname,*aname;
  911         u_int32_t       aoff;
  912         int attrtype = NTFS_A_DATA;
  913         char *attrname = NULL;
  914         struct fnode   *nfp;
  915         struct vnode   *nvp;
  916         enum vtype      f_type;
  917         int fullscan = 0;
  918         struct ntfs_lookup_ctx *lookup_ctx = NULL, *tctx;
  919 
  920         error = ntfs_ntget(ip);
  921         if (error)
  922                 return (error);
  923 
  924         error = ntfs_ntvattrget(ntmp, ip, NTFS_A_INDXROOT, "$I30", 0, &vap);
  925         if (error || (vap->va_flag & NTFS_AF_INRUN))
  926                 return (ENOTDIR);
  927 
  928         /*
  929          * Divide file name into: foofilefoofilefoofile[:attrspec]
  930          * Store like this:       fname:fnamelen       [aname:anamelen]
  931          */
  932         fname = cnp->cn_nameptr;
  933         aname = NULL;
  934         anamelen = 0;
  935         for (fnamelen = 0; fnamelen < cnp->cn_namelen; fnamelen++)
  936                 if(fname[fnamelen] == ':') {
  937                         aname = fname + fnamelen + 1;
  938                         anamelen = cnp->cn_namelen - fnamelen - 1;
  939                         dprintf(("ntfs_ntlookupfile: %s (%d), attr: %s (%d)\n",
  940                                 fname, fnamelen, aname, anamelen));
  941                         break;
  942                 }
  943 
  944         blsize = vap->va_a_iroot->ir_size;
  945         dprintf(("ntfs_ntlookupfile: blksz: %d\n", blsize));
  946 
  947         rdbuf = (void *) malloc(blsize, M_TEMP, M_WAITOK);
  948 
  949     loop:
  950         rdsize = vap->va_datalen;
  951         dprintf(("ntfs_ntlookupfile: rdsz: %d\n", rdsize));
  952 
  953         error = ntfs_readattr(ntmp, ip, NTFS_A_INDXROOT, "$I30",
  954                                0, rdsize, rdbuf, NULL);
  955         if (error)
  956                 goto fail;
  957 
  958         aoff = sizeof(struct attr_indexroot);
  959 
  960         do {
  961                 iep = (struct attr_indexentry *) ((char *)rdbuf + aoff);
  962 
  963                 for (; !(iep->ie_flag & NTFS_IEFLAG_LAST) && (rdsize > aoff);
  964                         aoff += iep->reclen,
  965                         iep = (struct attr_indexentry *) ((char *)rdbuf + aoff))
  966                 {
  967                         ddprintf(("scan: %d, %d\n",
  968                                   (u_int32_t) iep->ie_number,
  969                                   (u_int32_t) iep->ie_fnametype));
  970 
  971                         /* check the name - the case-insensitive check
  972                          * has to come first, to break from this for loop
  973                          * if needed, so we can dive correctly */
  974                         res = ntfs_uastricmp(ntmp, iep->ie_fname,
  975                                 iep->ie_fnamelen, fname, fnamelen);
  976                         if (!fullscan) {
  977                                 if (res > 0) break;
  978                                 if (res < 0) continue;
  979                         }
  980 
  981                         if (iep->ie_fnametype == 0 ||
  982                             !(ntmp->ntm_flag & NTFS_MFLAG_CASEINS))
  983                         {
  984                                 res = ntfs_uastrcmp(ntmp, iep->ie_fname,
  985                                         iep->ie_fnamelen, fname, fnamelen);
  986                                 if (res != 0 && !fullscan) continue;
  987                         }
  988 
  989                         /* if we perform full scan, the file does not match
  990                          * and this is subnode, dive */
  991                         if (fullscan && res != 0) {
  992                             if (iep->ie_flag & NTFS_IEFLAG_SUBNODE) {
  993                                 MALLOC(tctx, struct ntfs_lookup_ctx *,
  994                                         sizeof(struct ntfs_lookup_ctx),
  995                                         M_TEMP, M_WAITOK);
  996                                 tctx->aoff      = aoff + iep->reclen;
  997                                 tctx->rdsize    = rdsize;
  998                                 tctx->cn        = cn;
  999                                 tctx->prev      = lookup_ctx;
 1000                                 lookup_ctx = tctx;
 1001                                 break;
 1002                             } else
 1003                                 continue;
 1004                         }
 1005 
 1006                         if (aname) {
 1007                                 error = ntfs_ntlookupattr(ntmp,
 1008                                         aname, anamelen,
 1009                                         &attrtype, &attrname);
 1010                                 if (error)
 1011                                         goto fail;
 1012                         }
 1013 
 1014                         /* Check if we've found ourselves */
 1015                         if ((iep->ie_number == ip->i_number) &&
 1016                             (attrtype == fp->f_attrtype) &&
 1017                             ((!attrname && !fp->f_attrname) ||
 1018                              (attrname && fp->f_attrname &&
 1019                               !strcmp(attrname, fp->f_attrname))))
 1020                         {
 1021                                 VREF(vp);
 1022                                 *vpp = vp;
 1023                                 error = 0;
 1024                                 goto fail;
 1025                         }
 1026 
 1027                         /* free the buffer returned by ntfs_ntlookupattr() */
 1028                         if (attrname) {
 1029                                 FREE(attrname, M_TEMP);
 1030                                 attrname = NULL;
 1031                         }
 1032 
 1033                         /* vget node, but don't load it */
 1034                         error = ntfs_vgetex(ntmp->ntm_mountp,
 1035                                    iep->ie_number, attrtype, attrname,
 1036                                    LK_EXCLUSIVE, VG_DONTLOADIN | VG_DONTVALIDFN,
 1037                                    &nvp);
 1038                         if (error)
 1039                                 goto fail;
 1040 
 1041                         nfp = VTOF(nvp);
 1042 
 1043                         if (nfp->f_flag & FN_VALID) {
 1044                                 *vpp = nvp;
 1045                                 goto fail;
 1046                         }
 1047 
 1048                         nfp->f_fflag = iep->ie_fflag;
 1049                         nfp->f_pnumber = iep->ie_fpnumber;
 1050                         nfp->f_times = iep->ie_ftimes;
 1051 
 1052                         if((nfp->f_fflag & NTFS_FFLAG_DIR) &&
 1053                            (nfp->f_attrtype == NTFS_A_DATA) &&
 1054                            (nfp->f_attrname == NULL))
 1055                                 f_type = VDIR;
 1056                         else
 1057                                 f_type = VREG;
 1058 
 1059                         nvp->v_type = f_type;
 1060 
 1061                         if ((nfp->f_attrtype == NTFS_A_DATA) &&
 1062                             (nfp->f_attrname == NULL))
 1063                         {
 1064                                 /* Opening default attribute */
 1065                                 nfp->f_size = iep->ie_fsize;
 1066                                 nfp->f_allocated = iep->ie_fallocated;
 1067                                 nfp->f_flag |= FN_PRELOADED;
 1068                                 uvm_vnp_setsize(nvp, iep->ie_fsize);
 1069                         } else {
 1070                                 error = ntfs_filesize(ntmp, nfp,
 1071                                             &nfp->f_size, &nfp->f_allocated);
 1072                                 if (error) {
 1073                                         vput(nvp);
 1074                                         goto fail;
 1075                                 }
 1076                                 uvm_vnp_setsize(nvp, nfp->f_size);
 1077                         }
 1078 
 1079                         nfp->f_flag &= ~FN_VALID;
 1080                         *vpp = nvp;
 1081                         goto fail;
 1082                 }
 1083 
 1084                 /* Dive if possible */
 1085                 if (iep->ie_flag & NTFS_IEFLAG_SUBNODE) {
 1086                         dprintf(("ntfs_ntlookupfile: diving\n"));
 1087 
 1088                         cn = *(cn_t *) ((char *)rdbuf + aoff +
 1089                                         iep->reclen - sizeof(cn_t));
 1090                         rdsize = blsize;
 1091 
 1092                         error = ntfs_readattr(ntmp, ip, NTFS_A_INDX, "$I30",
 1093                                         ntfs_cntob(cn), rdsize, rdbuf, NULL);
 1094                         if (error)
 1095                                 goto fail;
 1096 
 1097                         error = ntfs_procfixups(ntmp, NTFS_INDXMAGIC,
 1098                                                 rdbuf, rdsize);
 1099                         if (error)
 1100                                 goto fail;
 1101 
 1102                         aoff = (((struct attr_indexalloc *) rdbuf)->ia_hdrsize +
 1103                                 0x18);
 1104                 } else if (fullscan && lookup_ctx) {
 1105                         cn = lookup_ctx->cn;
 1106                         aoff = lookup_ctx->aoff;
 1107                         rdsize = lookup_ctx->rdsize;
 1108 
 1109                         error = ntfs_readattr(ntmp, ip,
 1110                                 (cn == 0) ? NTFS_A_INDXROOT : NTFS_A_INDX,
 1111                                 "$I30", ntfs_cntob(cn), rdsize, rdbuf, NULL);
 1112                         if (error)
 1113                                 goto fail;
 1114 
 1115                         if (cn != 0) {
 1116                                 error = ntfs_procfixups(ntmp, NTFS_INDXMAGIC,
 1117                                                 rdbuf, rdsize);
 1118                                 if (error)
 1119                                         goto fail;
 1120                         }
 1121 
 1122                         tctx = lookup_ctx;
 1123                         lookup_ctx = lookup_ctx->prev;
 1124                         FREE(tctx, M_TEMP);
 1125                 } else {
 1126                         dprintf(("ntfs_ntlookupfile: nowhere to dive :-(\n"));
 1127                         error = ENOENT;
 1128                         break;
 1129                 }
 1130         } while (1);
 1131 
 1132         /* perform full scan if no entry was found */
 1133         if (!fullscan && error == ENOENT) {
 1134                 fullscan = 1;
 1135                 cn = 0;         /* need zero, used by lookup_ctx */
 1136 
 1137                 ddprintf(("ntfs_ntlookupfile: fullscan performed for: %.*s\n",
 1138                         (int) fnamelen, fname));
 1139                 goto loop;
 1140         }
 1141 
 1142         dprintf(("finish\n"));
 1143 
 1144 fail:
 1145         if (attrname)
 1146                 FREE(attrname, M_TEMP);
 1147         if (lookup_ctx) {
 1148                 while(lookup_ctx) {
 1149                         tctx = lookup_ctx;
 1150                         lookup_ctx = lookup_ctx->prev;
 1151                         FREE(tctx, M_TEMP);
 1152                 }
 1153         }
 1154         ntfs_ntvattrrele(vap);
 1155         ntfs_ntput(ip);
 1156         free(rdbuf, M_TEMP);
 1157         return (error);
 1158 }
 1159 
 1160 /*
 1161  * Check if name type is permitted to show.
 1162  */
 1163 int
 1164 ntfs_isnamepermitted(
 1165                      struct ntfsmount * ntmp,
 1166                      struct attr_indexentry * iep)
 1167 {
 1168         if (ntmp->ntm_flag & NTFS_MFLAG_ALLNAMES)
 1169                 return 1;
 1170 
 1171         switch (iep->ie_fnametype) {
 1172         case 2:
 1173                 ddprintf(("ntfs_isnamepermitted: skipped DOS name\n"));
 1174                 return 0;
 1175         case 0: case 1: case 3:
 1176                 return 1;
 1177         default:
 1178                 printf("ntfs_isnamepermitted: "
 1179                     "WARNING! Unknown file name type: %d\n",
 1180                     iep->ie_fnametype);
 1181                 break;
 1182         }
 1183         return 0;
 1184 }
 1185 
 1186 /*
 1187  * Read ntfs dir like stream of attr_indexentry, not like btree of them.
 1188  * This is done by scanning $BITMAP:$I30 for busy clusters and reading them.
 1189  * Of course $INDEX_ROOT:$I30 is read before. Last read values are stored in
 1190  * fnode, so we can skip toward record number num almost immediately.
 1191  * Anyway this is rather slow routine. The problem is that we don't know
 1192  * how many records are there in $INDEX_ALLOCATION:$I30 block.
 1193  */
 1194 int
 1195 ntfs_ntreaddir(
 1196                struct ntfsmount * ntmp,
 1197                struct fnode * fp,
 1198                u_int32_t num,
 1199                struct attr_indexentry ** riepp)
 1200 {
 1201         struct ntnode  *ip = FTONT(fp);
 1202         struct ntvattr *vap = NULL;     /* IndexRoot attribute */
 1203         struct ntvattr *bmvap = NULL;   /* BitMap attribute */
 1204         struct ntvattr *iavap = NULL;   /* IndexAllocation attribute */
 1205         void *        rdbuf;            /* Buffer to read directory's blocks  */
 1206         u_char         *bmp = NULL;     /* Bitmap */
 1207         u_int32_t       blsize;         /* Index allocation size (2048) */
 1208         u_int32_t       rdsize;         /* Length of data to read */
 1209         u_int32_t       attrnum;        /* Current attribute type */
 1210         u_int32_t       cpbl = 1;       /* Clusters per directory block */
 1211         u_int32_t       blnum;
 1212         struct attr_indexentry *iep;
 1213         int             error = ENOENT;
 1214         u_int32_t       aoff, cnum;
 1215 
 1216         dprintf(("ntfs_ntreaddir: read ino: %llu, num: %d\n",
 1217             (unsigned long long)ip->i_number, num));
 1218         error = ntfs_ntget(ip);
 1219         if (error)
 1220                 return (error);
 1221 
 1222         error = ntfs_ntvattrget(ntmp, ip, NTFS_A_INDXROOT, "$I30", 0, &vap);
 1223         if (error)
 1224                 return (ENOTDIR);
 1225 
 1226         if (fp->f_dirblbuf == NULL) {
 1227                 fp->f_dirblsz = vap->va_a_iroot->ir_size;
 1228                 fp->f_dirblbuf = (void *) malloc(
 1229                        MAX(vap->va_datalen,fp->f_dirblsz), M_NTFSDIR, M_WAITOK);
 1230         }
 1231 
 1232         blsize = fp->f_dirblsz;
 1233         rdbuf = fp->f_dirblbuf;
 1234 
 1235         dprintf(("ntfs_ntreaddir: rdbuf: %p, blsize: %d\n", rdbuf, blsize));
 1236 
 1237         if (vap->va_a_iroot->ir_flag & NTFS_IRFLAG_INDXALLOC) {
 1238                 error = ntfs_ntvattrget(ntmp, ip, NTFS_A_INDXBITMAP, "$I30",
 1239                                         0, &bmvap);
 1240                 if (error) {
 1241                         error = ENOTDIR;
 1242                         goto fail;
 1243                 }
 1244                 bmp = (u_char *) malloc(bmvap->va_datalen, M_TEMP, M_WAITOK);
 1245                 error = ntfs_readattr(ntmp, ip, NTFS_A_INDXBITMAP, "$I30", 0,
 1246                                        bmvap->va_datalen, bmp, NULL);
 1247                 if (error)
 1248                         goto fail;
 1249 
 1250                 error = ntfs_ntvattrget(ntmp, ip, NTFS_A_INDX, "$I30",
 1251                                         0, &iavap);
 1252                 if (error) {
 1253                         error = ENOTDIR;
 1254                         goto fail;
 1255                 }
 1256                 cpbl = ntfs_btocn(blsize + ntfs_cntob(1) - 1);
 1257                 dprintf(("ntfs_ntreaddir: indexalloc: %qu, cpbl: %d\n",
 1258                          (long long)iavap->va_datalen, cpbl));
 1259         } else {
 1260                 dprintf(("ntfs_ntreadidir: w/o BitMap and IndexAllocation\n"));
 1261                 iavap = bmvap = NULL;
 1262                 bmp = NULL;
 1263         }
 1264 
 1265         /* Try use previous values */
 1266         if ((fp->f_lastdnum < num) && (fp->f_lastdnum != 0)) {
 1267                 attrnum = fp->f_lastdattr;
 1268                 aoff = fp->f_lastdoff;
 1269                 blnum = fp->f_lastdblnum;
 1270                 cnum = fp->f_lastdnum;
 1271         } else {
 1272                 attrnum = NTFS_A_INDXROOT;
 1273                 aoff = sizeof(struct attr_indexroot);
 1274                 blnum = 0;
 1275                 cnum = 0;
 1276         }
 1277 
 1278         do {
 1279                 dprintf(("ntfs_ntreaddir: scan: 0x%x, %d, %d, %d, %d\n",
 1280                          attrnum, (u_int32_t) blnum, cnum, num, aoff));
 1281                 rdsize = (attrnum == NTFS_A_INDXROOT) ? vap->va_datalen : blsize;
 1282                 error = ntfs_readattr(ntmp, ip, attrnum, "$I30",
 1283                                 ntfs_cntob(blnum * cpbl), rdsize, rdbuf, NULL);
 1284                 if (error)
 1285                         goto fail;
 1286 
 1287                 if (attrnum == NTFS_A_INDX) {
 1288                         error = ntfs_procfixups(ntmp, NTFS_INDXMAGIC,
 1289                                                 rdbuf, rdsize);
 1290                         if (error)
 1291                                 goto fail;
 1292                 }
 1293                 if (aoff == 0)
 1294                         aoff = (attrnum == NTFS_A_INDX) ?
 1295                                 (0x18 + ((struct attr_indexalloc *) rdbuf)->ia_hdrsize) :
 1296                                 sizeof(struct attr_indexroot);
 1297 
 1298                 iep = (struct attr_indexentry *) ((char *)rdbuf + aoff);
 1299                 for (; !(iep->ie_flag & NTFS_IEFLAG_LAST) && (rdsize > aoff);
 1300                         aoff += iep->reclen,
 1301                         iep = (struct attr_indexentry *) ((char *)rdbuf + aoff))
 1302                 {
 1303                         if (!ntfs_isnamepermitted(ntmp, iep)) continue;
 1304 
 1305                         if (cnum >= num) {
 1306                                 fp->f_lastdnum = cnum;
 1307                                 fp->f_lastdoff = aoff;
 1308                                 fp->f_lastdblnum = blnum;
 1309                                 fp->f_lastdattr = attrnum;
 1310 
 1311                                 *riepp = iep;
 1312 
 1313                                 error = 0;
 1314                                 goto fail;
 1315                         }
 1316                         cnum++;
 1317                 }
 1318 
 1319                 if (iavap) {
 1320                         if (attrnum == NTFS_A_INDXROOT)
 1321                                 blnum = 0;
 1322                         else
 1323                                 blnum++;
 1324 
 1325                         while (ntfs_cntob(blnum * cpbl) < iavap->va_datalen) {
 1326                                 if (bmp[blnum >> 3] & (1 << (blnum & 3)))
 1327                                         break;
 1328                                 blnum++;
 1329                         }
 1330 
 1331                         attrnum = NTFS_A_INDX;
 1332                         aoff = 0;
 1333                         if (ntfs_cntob(blnum * cpbl) >= iavap->va_datalen)
 1334                                 break;
 1335                         dprintf(("ntfs_ntreaddir: blnum: %d\n", (u_int32_t) blnum));
 1336                 }
 1337         } while (iavap);
 1338 
 1339         *riepp = NULL;
 1340         fp->f_lastdnum = 0;
 1341 
 1342 fail:
 1343         if (vap)
 1344                 ntfs_ntvattrrele(vap);
 1345         if (bmvap)
 1346                 ntfs_ntvattrrele(bmvap);
 1347         if (iavap)
 1348                 ntfs_ntvattrrele(iavap);
 1349         if (bmp)
 1350                 FREE(bmp, M_TEMP);
 1351         ntfs_ntput(ip);
 1352         return (error);
 1353 }
 1354 
 1355 /*
 1356  * Convert NTFS times that are in 100 ns units and begins from
 1357  * 1601 Jan 1 into unix times.
 1358  */
 1359 struct timespec
 1360 ntfs_nttimetounix(
 1361                   u_int64_t nt)
 1362 {
 1363         struct timespec t;
 1364 
 1365         /* WindowNT times are in 100 ns and from 1601 Jan 1 */
 1366         t.tv_nsec = (nt % (1000 * 1000 * 10)) * 100;
 1367         t.tv_sec = nt / (1000 * 1000 * 10) -
 1368                 369LL * 365LL * 24LL * 60LL * 60LL -
 1369                 89LL * 1LL * 24LL * 60LL * 60LL;
 1370         return (t);
 1371 }
 1372 
 1373 /*
 1374  * Get file times from NTFS_A_NAME attribute.
 1375  */
 1376 int
 1377 ntfs_times(
 1378            struct ntfsmount * ntmp,
 1379            struct ntnode * ip,
 1380            ntfs_times_t * tm)
 1381 {
 1382         struct ntvattr *vap;
 1383         int             error;
 1384 
 1385         dprintf(("ntfs_times: ino: %llu...\n",
 1386             (unsigned long long)ip->i_number));
 1387 
 1388         error = ntfs_ntget(ip);
 1389         if (error)
 1390                 return (error);
 1391 
 1392         error = ntfs_ntvattrget(ntmp, ip, NTFS_A_NAME, NULL, 0, &vap);
 1393         if (error) {
 1394                 ntfs_ntput(ip);
 1395                 return (error);
 1396         }
 1397         *tm = vap->va_a_name->n_times;
 1398         ntfs_ntvattrrele(vap);
 1399         ntfs_ntput(ip);
 1400 
 1401         return (0);
 1402 }
 1403 
 1404 /*
 1405  * Get file sizes from corresponding attribute.
 1406  *
 1407  * ntnode under fnode should be locked.
 1408  */
 1409 int
 1410 ntfs_filesize(
 1411               struct ntfsmount * ntmp,
 1412               struct fnode * fp,
 1413               u_int64_t * size,
 1414               u_int64_t * bytes)
 1415 {
 1416         struct ntvattr *vap;
 1417         struct ntnode *ip = FTONT(fp);
 1418         u_int64_t       sz, bn;
 1419         int             error;
 1420 
 1421         dprintf(("ntfs_filesize: ino: %llu\n",
 1422             (unsigned long long)ip->i_number));
 1423 
 1424         error = ntfs_ntvattrget(ntmp, ip,
 1425                 fp->f_attrtype, fp->f_attrname, 0, &vap);
 1426         if (error)
 1427                 return (error);
 1428 
 1429         bn = vap->va_allocated;
 1430         sz = vap->va_datalen;
 1431 
 1432         dprintf(("ntfs_filesize: %d bytes (%d bytes allocated)\n",
 1433                 (u_int32_t) sz, (u_int32_t) bn));
 1434 
 1435         if (size)
 1436                 *size = sz;
 1437         if (bytes)
 1438                 *bytes = bn;
 1439 
 1440         ntfs_ntvattrrele(vap);
 1441 
 1442         return (0);
 1443 }
 1444 
 1445 /*
 1446  * This is one of write routine.
 1447  */
 1448 int
 1449 ntfs_writeattr_plain(
 1450         struct ntfsmount * ntmp,
 1451         struct ntnode * ip,
 1452         u_int32_t attrnum,
 1453         char *attrname,
 1454         off_t roff,
 1455         size_t rsize,
 1456         void *rdata,
 1457         size_t * initp,
 1458         struct uio *uio)
 1459 {
 1460         size_t          init;
 1461         int             error = 0;
 1462         off_t           off = roff, left = rsize, towrite;
 1463         void *        data = rdata;
 1464         struct ntvattr *vap;
 1465         *initp = 0;
 1466 
 1467         while (left) {
 1468                 error = ntfs_ntvattrget(ntmp, ip, attrnum, attrname,
 1469                                         ntfs_btocn(off), &vap);
 1470                 if (error)
 1471                         return (error);
 1472                 towrite = MIN(left, ntfs_cntob(vap->va_vcnend + 1) - off);
 1473                 ddprintf(("ntfs_writeattr_plain: o: %qd, s: %qd (%qu - %qu)\n",
 1474                          (long long) off, (long long) towrite,
 1475                          (long long) vap->va_vcnstart,
 1476                          (long long) vap->va_vcnend));
 1477                 error = ntfs_writentvattr_plain(ntmp, ip, vap,
 1478                                          off - ntfs_cntob(vap->va_vcnstart),
 1479                                          towrite, data, &init, uio);
 1480                 if (error) {
 1481                         dprintf(("ntfs_writeattr_plain: "
 1482                             "ntfs_writentvattr_plain failed: o: %qd, s: %qd\n",
 1483                             (long long) off, (long long) towrite));
 1484                         dprintf(("ntfs_writeattr_plain: attrib: %qu - %qu\n",
 1485                                (long long) vap->va_vcnstart,
 1486                                (long long) vap->va_vcnend));
 1487                         ntfs_ntvattrrele(vap);
 1488                         break;
 1489                 }
 1490                 ntfs_ntvattrrele(vap);
 1491                 left -= towrite;
 1492                 off += towrite;
 1493                 data = (char *)data + towrite;
 1494                 *initp += init;
 1495         }
 1496 
 1497         return (error);
 1498 }
 1499 
 1500 /*
 1501  * This is one of write routine.
 1502  *
 1503  * ntnode should be locked.
 1504  */
 1505 int
 1506 ntfs_writentvattr_plain(
 1507         struct ntfsmount * ntmp,
 1508         struct ntnode * ip,
 1509         struct ntvattr * vap,
 1510         off_t roff,
 1511         size_t rsize,
 1512         void *rdata,
 1513         size_t * initp,
 1514         struct uio *uio)
 1515 {
 1516         int             error = 0;
 1517         off_t           off;
 1518         int             cnt;
 1519         cn_t            ccn, ccl, cn, left, cl;
 1520         void *        data = rdata;
 1521         daddr_t         lbn;
 1522         struct buf     *bp;
 1523         size_t          tocopy;
 1524 
 1525         *initp = 0;
 1526 
 1527         if ((vap->va_flag & NTFS_AF_INRUN) == 0) {
 1528                 dprintf(("ntfs_writevattr_plain: CAN'T WRITE RES. ATTRIBUTE\n"));
 1529                 return ENOTTY;
 1530         }
 1531 
 1532         ddprintf(("ntfs_writentvattr_plain: data in run: %lu chains\n",
 1533                  vap->va_vruncnt));
 1534 
 1535         off = roff;
 1536         left = rsize;
 1537         ccl = 0;
 1538         ccn = 0;
 1539         cnt = 0;
 1540         for (; left && (cnt < vap->va_vruncnt); cnt++) {
 1541                 ccn = vap->va_vruncn[cnt];
 1542                 ccl = vap->va_vruncl[cnt];
 1543 
 1544                 ddprintf(("ntfs_writentvattr_plain: "
 1545                     "left %qu, cn: 0x%qx, cl: %qu, off: %qd\n",
 1546                     (long long) left, (long long) ccn,
 1547                     (long long) ccl, (long long) off));
 1548 
 1549                 if (ntfs_cntob(ccl) < off) {
 1550                         off -= ntfs_cntob(ccl);
 1551                         cnt++;
 1552                         continue;
 1553                 }
 1554                 if (!ccn && ip->i_number != NTFS_BOOTINO)
 1555                         continue; /* XXX */
 1556 
 1557                 ccl -= ntfs_btocn(off);
 1558                 cn = ccn + ntfs_btocn(off);
 1559                 off = ntfs_btocnoff(off);
 1560 
 1561                 while (left && ccl) {
 1562                         /*
 1563                          * Always read and write single clusters at a time -
 1564                          * we need to avoid requesting differently-sized
 1565                          * blocks at the same disk offsets to avoid
 1566                          * confusing the buffer cache.
 1567                          */
 1568                         tocopy = MIN(left, ntfs_cntob(1) - off);
 1569                         cl = ntfs_btocl(tocopy + off);
 1570                         KASSERT(cl == 1 && tocopy <= ntfs_cntob(1));
 1571                         ddprintf(("ntfs_writentvattr_plain: write: "
 1572                                 "cn: 0x%qx cl: %qu, off: %qd len: %qu, left: %qu\n",
 1573                                 (long long) cn, (long long) cl,
 1574                                 (long long) off, (long long) tocopy,
 1575                                 (long long) left));
 1576                         if ((off == 0) && (tocopy == ntfs_cntob(cl)))
 1577                         {
 1578                                 lbn = ntfs_cntobn(cn);
 1579                                 bp = getblk(ntmp->ntm_devvp, lbn,
 1580                                             ntfs_cntob(cl), 0, 0);
 1581                                 clrbuf(bp);
 1582                         } else {
 1583                                 error = bread(ntmp->ntm_devvp, ntfs_cntobn(cn),
 1584                                     ntfs_cntob(cl), NOCRED, B_MODIFY, &bp);
 1585                                 if (error) {
 1586                                         brelse(bp, 0);
 1587                                         return (error);
 1588                                 }
 1589                         }
 1590                         if (uio)
 1591                                 uiomove((char *)bp->b_data + off, tocopy, uio);
 1592                         else
 1593                                 memcpy((char *)bp->b_data + off, data, tocopy);
 1594                         bawrite(bp);
 1595                         data = (char *)data + tocopy;
 1596                         *initp += tocopy;
 1597                         off = 0;
 1598                         left -= tocopy;
 1599                         cn += cl;
 1600                         ccl -= cl;
 1601                 }
 1602         }
 1603 
 1604         if (left) {
 1605                 printf("ntfs_writentvattr_plain: POSSIBLE RUN ERROR\n");
 1606                 error = EINVAL;
 1607         }
 1608 
 1609         return (error);
 1610 }
 1611 
 1612 /*
 1613  * This is one of read routines.
 1614  *
 1615  * ntnode should be locked.
 1616  */
 1617 int
 1618 ntfs_readntvattr_plain(
 1619         struct ntfsmount * ntmp,
 1620         struct ntnode * ip,
 1621         struct ntvattr * vap,
 1622         off_t roff,
 1623         size_t rsize,
 1624         void *rdata,
 1625         size_t * initp,
 1626         struct uio *uio)
 1627 {
 1628         int             error = 0;
 1629         off_t           off;
 1630 
 1631         *initp = 0;
 1632         if (vap->va_flag & NTFS_AF_INRUN) {
 1633                 int             cnt;
 1634                 cn_t            ccn, ccl, cn, left, cl;
 1635                 void *        data = rdata;
 1636                 struct buf     *bp;
 1637                 size_t          tocopy;
 1638 
 1639                 ddprintf(("ntfs_readntvattr_plain: data in run: %lu chains\n",
 1640                          vap->va_vruncnt));
 1641 
 1642                 off = roff;
 1643                 left = rsize;
 1644                 ccl = 0;
 1645                 ccn = 0;
 1646                 cnt = 0;
 1647                 while (left && (cnt < vap->va_vruncnt)) {
 1648                         ccn = vap->va_vruncn[cnt];
 1649                         ccl = vap->va_vruncl[cnt];
 1650 
 1651                         ddprintf(("ntfs_readntvattr_plain: "
 1652                                  "left %qu, cn: 0x%qx, cl: %qu, off: %qd\n",
 1653                                  (long long) left, (long long) ccn,
 1654                                  (long long) ccl, (long long) off));
 1655 
 1656                         if (ntfs_cntob(ccl) < off) {
 1657                                 off -= ntfs_cntob(ccl);
 1658                                 cnt++;
 1659                                 continue;
 1660                         }
 1661                         if (ccn || ip->i_number == NTFS_BOOTINO) {
 1662                                 ccl -= ntfs_btocn(off);
 1663                                 cn = ccn + ntfs_btocn(off);
 1664                                 off = ntfs_btocnoff(off);
 1665 
 1666                                 while (left && ccl) {
 1667                                         /*
 1668                                          * Always read single clusters at a
 1669                                          * time - we need to avoid reading
 1670                                          * differently-sized blocks at the
 1671                                          * same disk offsets to avoid
 1672                                          * confusing the buffer cache.
 1673                                          */
 1674                                         tocopy = MIN(left,
 1675                                             ntfs_cntob(1) - off);
 1676                                         cl = ntfs_btocl(tocopy + off);
 1677                                         KASSERT(cl == 1 &&
 1678                                             tocopy <= ntfs_cntob(1));
 1679 
 1680                                         ddprintf(("ntfs_readntvattr_plain: "
 1681                                                 "read: cn: 0x%qx cl: %qu, "
 1682                                                 "off: %qd len: %qu, left: %qu\n",
 1683                                                 (long long) cn,
 1684                                                 (long long) cl,
 1685                                                 (long long) off,
 1686                                                 (long long) tocopy,
 1687                                                 (long long) left));
 1688                                         error = bread(ntmp->ntm_devvp,
 1689                                                       ntfs_cntobn(cn),
 1690                                                       ntfs_cntob(cl),
 1691                                                       NOCRED, 0, &bp);
 1692                                         if (error) {
 1693                                                 brelse(bp, 0);
 1694                                                 return (error);
 1695                                         }
 1696                                         if (uio) {
 1697                                                 uiomove((char *)bp->b_data + off,
 1698                                                         tocopy, uio);
 1699                                         } else {
 1700                                                 memcpy(data, (char *)bp->b_data + off,
 1701                                                         tocopy);
 1702                                         }
 1703                                         brelse(bp, 0);
 1704                                         data = (char *)data + tocopy;
 1705                                         *initp += tocopy;
 1706                                         off = 0;
 1707                                         left -= tocopy;
 1708                                         cn += cl;
 1709                                         ccl -= cl;
 1710                                 }
 1711                         } else {
 1712                                 tocopy = MIN(left, ntfs_cntob(ccl) - off);
 1713                                 ddprintf(("ntfs_readntvattr_plain: "
 1714                                         "hole: ccn: 0x%qx ccl: %qu, off: %qd, "
 1715                                         " len: %qu, left: %qu\n",
 1716                                         (long long) ccn, (long long) ccl,
 1717                                         (long long) off, (long long) tocopy,
 1718                                         (long long) left));
 1719                                 left -= tocopy;
 1720                                 off = 0;
 1721                                 if (uio) {
 1722                                         char vbuf[] = "";
 1723                                         size_t remains = tocopy;
 1724                                         for(; remains; remains--)
 1725                                                 uiomove(vbuf, 1, uio);
 1726                                 } else
 1727                                         bzero(data, tocopy);
 1728                                 data = (char *)data + tocopy;
 1729                         }
 1730                         cnt++;
 1731                 }
 1732                 if (left) {
 1733                         printf("ntfs_readntvattr_plain: POSSIBLE RUN ERROR\n");
 1734                         error = E2BIG;
 1735                 }
 1736         } else {
 1737                 ddprintf(("ntfs_readnvattr_plain: data is in mft record\n"));
 1738                 if (uio)
 1739                         uiomove((char *)vap->va_datap + roff, rsize, uio);
 1740                 else
 1741                         memcpy(rdata, (char *)vap->va_datap + roff, rsize);
 1742                 *initp += rsize;
 1743         }
 1744 
 1745         return (error);
 1746 }
 1747 
 1748 /*
 1749  * This is one of read routines.
 1750  */
 1751 int
 1752 ntfs_readattr_plain(
 1753         struct ntfsmount * ntmp,
 1754         struct ntnode * ip,
 1755         u_int32_t attrnum,
 1756         const char *attrname,
 1757         off_t roff,
 1758         size_t rsize,
 1759         void *rdata,
 1760         size_t * initp,
 1761         struct uio *uio)
 1762 {
 1763         size_t          init;
 1764         int             error = 0;
 1765         off_t           off = roff, left = rsize, toread;
 1766         void *        data = rdata;
 1767         struct ntvattr *vap;
 1768         *initp = 0;
 1769 
 1770         while (left) {
 1771                 error = ntfs_ntvattrget(ntmp, ip, attrnum, attrname,
 1772                                         ntfs_btocn(off), &vap);
 1773                 if (error)
 1774                         return (error);
 1775                 toread = MIN(left, ntfs_cntob(vap->va_vcnend + 1) - off);
 1776                 ddprintf(("ntfs_readattr_plain: o: %qd, s: %qd (%qu - %qu)\n",
 1777                          (long long) off, (long long) toread,
 1778                          (long long) vap->va_vcnstart,
 1779                          (long long) vap->va_vcnend));
 1780                 error = ntfs_readntvattr_plain(ntmp, ip, vap,
 1781                                          off - ntfs_cntob(vap->va_vcnstart),
 1782                                          toread, data, &init, uio);
 1783                 if (error) {
 1784                         printf("ntfs_readattr_plain: "
 1785                                "ntfs_readntvattr_plain failed: o: %qd, s: %qd\n",
 1786                                (long long) off, (long long) toread);
 1787                         printf("ntfs_readattr_plain: attrib: %qu - %qu\n",
 1788                                (long long) vap->va_vcnstart, 
 1789                                (long long) vap->va_vcnend);
 1790                         ntfs_ntvattrrele(vap);
 1791                         break;
 1792                 }
 1793                 ntfs_ntvattrrele(vap);
 1794                 left -= toread;
 1795                 off += toread;
 1796                 data = (char *)data + toread;
 1797                 *initp += init;
 1798         }
 1799 
 1800         return (error);
 1801 }
 1802 
 1803 /*
 1804  * This is one of read routines.
 1805  */
 1806 int
 1807 ntfs_readattr(
 1808         struct ntfsmount * ntmp,
 1809         struct ntnode * ip,
 1810         u_int32_t attrnum,
 1811         const char *attrname,
 1812         off_t roff,
 1813         size_t rsize,
 1814         void *rdata,
 1815         struct uio *uio)
 1816 {
 1817         int             error = 0;
 1818         struct ntvattr *vap;
 1819         size_t          init;
 1820 
 1821         ddprintf(("ntfs_readattr: reading %llu: 0x%x, from %qd size %qu"
 1822             " bytes\n", (unsigned long long)ip->i_number, attrnum,
 1823             (long long)roff, (long long)rsize));
 1824 
 1825         error = ntfs_ntvattrget(ntmp, ip, attrnum, attrname, 0, &vap);
 1826         if (error)
 1827                 return (error);
 1828 
 1829         if ((roff > vap->va_datalen) ||
 1830             (roff + rsize > vap->va_datalen)) {
 1831                 printf("ntfs_readattr: offset too big: %qd (%qd) > %qu\n",
 1832                         (long long) roff, (long long) (roff + rsize),
 1833                         (long long) vap->va_datalen);
 1834                 ntfs_ntvattrrele(vap);
 1835                 return (E2BIG);
 1836         }
 1837         if (vap->va_compression && vap->va_compressalg) {
 1838                 u_int8_t       *cup;
 1839                 u_int8_t       *uup;
 1840                 off_t           off = roff, left = rsize, tocopy;
 1841                 void *        data = rdata;
 1842                 cn_t            cn;
 1843 
 1844                 ddprintf(("ntfs_ntreadattr: compression: %d\n",
 1845                          vap->va_compressalg));
 1846 
 1847                 cup = malloc(ntfs_cntob(NTFS_COMPUNIT_CL),
 1848                        M_NTFSDECOMP, M_WAITOK);
 1849                 uup = malloc(ntfs_cntob(NTFS_COMPUNIT_CL),
 1850                        M_NTFSDECOMP, M_WAITOK);
 1851 
 1852                 cn = (ntfs_btocn(roff)) & (~(NTFS_COMPUNIT_CL - 1));
 1853                 off = roff - ntfs_cntob(cn);
 1854 
 1855                 while (left) {
 1856                         error = ntfs_readattr_plain(ntmp, ip, attrnum,
 1857                                                   attrname, ntfs_cntob(cn),
 1858                                                   ntfs_cntob(NTFS_COMPUNIT_CL),
 1859                                                   cup, &init, NULL);
 1860                         if (error)
 1861                                 break;
 1862 
 1863                         tocopy = MIN(left, ntfs_cntob(NTFS_COMPUNIT_CL) - off);
 1864 
 1865                         if (init == ntfs_cntob(NTFS_COMPUNIT_CL)) {
 1866                                 if (uio)
 1867                                         uiomove(cup + off, tocopy, uio);
 1868                                 else
 1869                                         memcpy(data, cup + off, tocopy);
 1870                         } else if (init == 0) {
 1871                                 if (uio) {
 1872                                         char vbuf[] = "";
 1873                                         size_t remains = tocopy;
 1874                                         for(; remains; remains--)
 1875                                                 uiomove(vbuf, 1, uio);
 1876                                 }
 1877                                 else
 1878                                         bzero(data, tocopy);
 1879                         } else {
 1880                                 error = ntfs_uncompunit(ntmp, uup, cup);
 1881                                 if (error)
 1882                                         break;
 1883                                 if (uio)
 1884                                         uiomove(uup + off, tocopy, uio);
 1885                                 else
 1886                                         memcpy(data, uup + off, tocopy);
 1887                         }
 1888 
 1889                         left -= tocopy;
 1890                         data = (char *)data + tocopy;
 1891                         off += tocopy - ntfs_cntob(NTFS_COMPUNIT_CL);
 1892                         cn += NTFS_COMPUNIT_CL;
 1893                 }
 1894 
 1895                 FREE(uup, M_NTFSDECOMP);
 1896                 FREE(cup, M_NTFSDECOMP);
 1897         } else
 1898                 error = ntfs_readattr_plain(ntmp, ip, attrnum, attrname,
 1899                                              roff, rsize, rdata, &init, uio);
 1900         ntfs_ntvattrrele(vap);
 1901         return (error);
 1902 }
 1903 
 1904 #if UNUSED_CODE
 1905 int
 1906 ntfs_parserun(
 1907               cn_t * cn,
 1908               cn_t * cl,
 1909               u_int8_t * run,
 1910               u_long len,
 1911               u_long *off)
 1912 {
 1913         u_int8_t        sz;
 1914         int             i;
 1915 
 1916         if (NULL == run) {
 1917                 printf("ntfs_parsetun: run == NULL\n");
 1918                 return (EINVAL);
 1919         }
 1920         sz = run[(*off)++];
 1921         if (0 == sz) {
 1922                 printf("ntfs_parserun: trying to go out of run\n");
 1923                 return (E2BIG);
 1924         }
 1925         *cl = 0;
 1926         if ((sz & 0xF) > 8 || (*off) + (sz & 0xF) > len) {
 1927                 printf("ntfs_parserun: "
 1928                        "bad run: length too big: sz: 0x%02x (%ld < %ld + sz)\n",
 1929                        sz, len, *off);
 1930                 return (EINVAL);
 1931         }
 1932         for (i = 0; i < (sz & 0xF); i++)
 1933                 *cl += (u_int32_t) run[(*off)++] << (i << 3);
 1934 
 1935         sz >>= 4;
 1936         if ((sz & 0xF) > 8 || (*off) + (sz & 0xF) > len) {
 1937                 printf("ntfs_parserun: "
 1938                        "bad run: length too big: sz: 0x%02x (%ld < %ld + sz)\n",
 1939                        sz, len, *off);
 1940                 return (EINVAL);
 1941         }
 1942         for (i = 0; i < (sz & 0xF); i++)
 1943                 *cn += (u_int32_t) run[(*off)++] << (i << 3);
 1944 
 1945         return (0);
 1946 }
 1947 #endif
 1948 
 1949 /*
 1950  * Process fixup routine on given buffer.
 1951  */
 1952 int
 1953 ntfs_procfixups(
 1954                 struct ntfsmount * ntmp,
 1955                 u_int32_t magic,
 1956                 void *xbufv,
 1957                 size_t len)
 1958 {
 1959         char *xbuf = xbufv;
 1960         struct fixuphdr *fhp = (struct fixuphdr *) xbuf;
 1961         int             i;
 1962         u_int16_t       fixup;
 1963         u_int16_t      *fxp;
 1964         u_int16_t      *cfxp;
 1965 
 1966         if (fhp->fh_magic != magic) {
 1967                 printf("ntfs_procfixups: magic doesn't match: %08x != %08x\n",
 1968                        fhp->fh_magic, magic);
 1969                 return (EINVAL);
 1970         }
 1971         if ((fhp->fh_fnum - 1) * ntmp->ntm_bps != len) {
 1972                 printf("ntfs_procfixups: "
 1973                        "bad fixups number: %d for %ld bytes block\n",
 1974                        fhp->fh_fnum, (long)len);        /* XXX printf kludge */
 1975                 return (EINVAL);
 1976         }
 1977         if (fhp->fh_foff >= ntmp->ntm_spc * ntmp->ntm_mftrecsz * ntmp->ntm_bps) {
 1978                 printf("ntfs_procfixups: invalid offset: %x", fhp->fh_foff);
 1979                 return (EINVAL);
 1980         }
 1981         fxp = (u_int16_t *) (xbuf + fhp->fh_foff);
 1982         cfxp = (u_int16_t *) (xbuf + ntmp->ntm_bps - 2);
 1983         fixup = *fxp++;
 1984         for (i = 1; i < fhp->fh_fnum; i++, fxp++) {
 1985                 if (*cfxp != fixup) {
 1986                         printf("ntfs_procfixups: fixup %d doesn't match\n", i);
 1987                         return (EINVAL);
 1988                 }
 1989                 *cfxp = *fxp;
 1990                 cfxp = (u_int16_t *)((char *)cfxp + ntmp->ntm_bps);
 1991         }
 1992         return (0);
 1993 }
 1994 
 1995 #if UNUSED_CODE
 1996 int
 1997 ntfs_runtocn(
 1998              cn_t * cn,
 1999              struct ntfsmount * ntmp,
 2000              u_int8_t * run,
 2001              u_long len,
 2002              cn_t vcn)
 2003 {
 2004         cn_t            ccn = 0;
 2005         cn_t            ccl = 0;
 2006         u_long          off = 0;
 2007         int             error = 0;
 2008 
 2009 #ifdef NTFS_DEBUG
 2010         int             i;
 2011         printf("ntfs_runtocn: run: %p, %ld bytes, vcn:%ld\n",
 2012                 run, len, (u_long) vcn);
 2013         printf("ntfs_runtocn: run: ");
 2014         for (i = 0; i < len; i++)
 2015                 printf("0x%02x ", run[i]);
 2016         printf("\n");
 2017 #endif
 2018 
 2019         if (NULL == run) {
 2020                 printf("ntfs_runtocn: run == NULL\n");
 2021                 return (EINVAL);
 2022         }
 2023         do {
 2024                 if (run[off] == 0) {
 2025                         printf("ntfs_runtocn: vcn too big\n");
 2026                         return (E2BIG);
 2027                 }
 2028                 vcn -= ccl;
 2029                 error = ntfs_parserun(&ccn, &ccl, run, len, &off);
 2030                 if (error) {
 2031                         printf("ntfs_runtocn: ntfs_parserun failed\n");
 2032                         return (error);
 2033                 }
 2034         } while (ccl <= vcn);
 2035         *cn = ccn + vcn;
 2036         return (0);
 2037 }
 2038 #endif
 2039 
 2040 /*
 2041  * this initializes toupper table & dependant variables to be ready for
 2042  * later work
 2043  */
 2044 void
 2045 ntfs_toupper_init()
 2046 {
 2047         ntfs_toupper_tab = (wchar *) NULL;
 2048         mutex_init(&ntfs_toupper_lock, MUTEX_DEFAULT, IPL_NONE);
 2049         ntfs_toupper_usecount = 0;
 2050 }
 2051 
 2052 /*
 2053  * if the ntfs_toupper_tab[] is filled already, just raise use count;
 2054  * otherwise read the data from the filesystem we are currently mounting
 2055  */
 2056 int
 2057 ntfs_toupper_use(mp, ntmp)
 2058         struct mount *mp;
 2059         struct ntfsmount *ntmp;
 2060 {
 2061         int error = 0;
 2062         struct vnode *vp;
 2063 
 2064         /* get exclusive access */
 2065         mutex_enter(&ntfs_toupper_lock);
 2066 
 2067         /* only read the translation data from a file if it hasn't been
 2068          * read already */
 2069         if (ntfs_toupper_tab)
 2070                 goto out;
 2071 
 2072         /*
 2073          * Read in Unicode lowercase -> uppercase translation file.
 2074          * XXX for now, just the first 256 entries are used anyway,
 2075          * so don't bother reading more
 2076          */
 2077         MALLOC(ntfs_toupper_tab, wchar *, 256 * 256 * sizeof(wchar),
 2078                 M_NTFSRDATA, M_WAITOK);
 2079 
 2080         if ((error = VFS_VGET(mp, NTFS_UPCASEINO, &vp)))
 2081                 goto out;
 2082         error = ntfs_readattr(ntmp, VTONT(vp), NTFS_A_DATA, NULL,
 2083                         0, 256*256*sizeof(wchar), (char *) ntfs_toupper_tab,
 2084                         NULL);
 2085         vput(vp);
 2086 
 2087     out:
 2088         ntfs_toupper_usecount++;
 2089         mutex_exit(&ntfs_toupper_lock);
 2090         return (error);
 2091 }
 2092 
 2093 /*
 2094  * lower the use count and if it reaches zero, free the memory
 2095  * tied by toupper table
 2096  */
 2097 void
 2098 ntfs_toupper_unuse()
 2099 {
 2100         /* get exclusive access */
 2101         mutex_enter(&ntfs_toupper_lock);
 2102 
 2103         ntfs_toupper_usecount--;
 2104         if (ntfs_toupper_usecount == 0) {
 2105                 FREE(ntfs_toupper_tab, M_NTFSRDATA);
 2106                 ntfs_toupper_tab = NULL;
 2107         }
 2108 #ifdef DIAGNOSTIC
 2109         else if (ntfs_toupper_usecount < 0) {
 2110                 panic("ntfs_toupper_unuse(): use count negative: %d",
 2111                         ntfs_toupper_usecount);
 2112         }
 2113 #endif
 2114 
 2115         /* release the lock */
 2116         mutex_exit(&ntfs_toupper_lock);
 2117 }

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