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

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    1 /*      $NetBSD: ntfs_vnops.c,v 1.23 1999/10/31 19:45:27 jdolecek Exp $ */
    2 
    3 /*-
    4  * Copyright (c) 1992, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * John Heidemann of the UCLA Ficus project.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  * $FreeBSD: releng/6.2/sys/fs/ntfs/ntfs_vnops.c 164285 2006-11-14 20:42:40Z trhodes $
   35  *
   36  */
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/kernel.h>
   41 #include <sys/time.h>
   42 #include <sys/types.h>
   43 #include <sys/stat.h>
   44 #include <sys/vnode.h>
   45 #include <sys/mount.h>
   46 #include <sys/namei.h>
   47 #include <sys/malloc.h>
   48 #include <sys/bio.h>
   49 #include <sys/buf.h>
   50 #include <sys/dirent.h>
   51 
   52 #include <vm/vm.h>
   53 #include <vm/vm_param.h>
   54 #include <vm/vm_page.h>
   55 #include <vm/vm_object.h>
   56 #include <vm/vm_pager.h>
   57 #include <vm/vnode_pager.h>
   58 #include <vm/vm_extern.h>
   59 
   60 #include <sys/sysctl.h>
   61 
   62 /*#define NTFS_DEBUG 1*/
   63 #include <fs/ntfs/ntfs.h>
   64 #include <fs/ntfs/ntfs_inode.h>
   65 #include <fs/ntfs/ntfs_subr.h>
   66 
   67 #include <sys/unistd.h> /* for pathconf(2) constants */
   68 
   69 static vop_read_t       ntfs_read;
   70 static vop_write_t      ntfs_write;
   71 static vop_getattr_t    ntfs_getattr;
   72 static vop_inactive_t   ntfs_inactive;
   73 static vop_reclaim_t    ntfs_reclaim;
   74 static vop_bmap_t       ntfs_bmap;
   75 static vop_strategy_t   ntfs_strategy;
   76 static vop_access_t     ntfs_access;
   77 static vop_open_t       ntfs_open;
   78 static vop_close_t      ntfs_close;
   79 static vop_readdir_t    ntfs_readdir;
   80 static vop_cachedlookup_t       ntfs_lookup;
   81 static vop_fsync_t      ntfs_fsync;
   82 static vop_pathconf_t   ntfs_pathconf;
   83 
   84 int     ntfs_prtactive = 1;     /* 1 => print out reclaim of active vnodes */
   85 
   86 /*
   87  * This is a noop, simply returning what one has been given.
   88  */
   89 int
   90 ntfs_bmap(ap)
   91         struct vop_bmap_args /* {
   92                 struct vnode *a_vp;
   93                 daddr_t  a_bn;
   94                 struct bufobj **a_bop;
   95                 daddr_t *a_bnp;
   96                 int *a_runp;
   97                 int *a_runb;
   98         } */ *ap;
   99 {
  100         struct vnode *vp = ap->a_vp;
  101 
  102         dprintf(("ntfs_bmap: vn: %p, blk: %d\n", ap->a_vp,(u_int32_t)ap->a_bn));
  103         if (ap->a_bop != NULL)
  104                 *ap->a_bop = &vp->v_bufobj;
  105         if (ap->a_bnp != NULL)
  106                 *ap->a_bnp = ap->a_bn;
  107         if (ap->a_runp != NULL)
  108                 *ap->a_runp = 0;
  109         if (ap->a_runb != NULL)
  110                 *ap->a_runb = 0;
  111         return (0);
  112 }
  113 
  114 static int
  115 ntfs_read(ap)
  116         struct vop_read_args /* {
  117                 struct vnode *a_vp;
  118                 struct uio *a_uio;
  119                 int a_ioflag;
  120                 struct ucred *a_cred;
  121         } */ *ap;
  122 {
  123         register struct vnode *vp = ap->a_vp;
  124         register struct fnode *fp = VTOF(vp);
  125         register struct ntnode *ip = FTONT(fp);
  126         struct uio *uio = ap->a_uio;
  127         struct ntfsmount *ntmp = ip->i_mp;
  128         struct buf *bp;
  129         daddr_t cn;
  130         int resid, off, toread;
  131         int error;
  132 
  133         dprintf(("ntfs_read: ino: %d, off: %d resid: %d, segflg: %d\n",ip->i_number,(u_int32_t)uio->uio_offset,uio->uio_resid,uio->uio_segflg));
  134 
  135         dprintf(("ntfs_read: filesize: %d",(u_int32_t)fp->f_size));
  136 
  137         /* don't allow reading after end of file */
  138         if (uio->uio_offset > fp->f_size)
  139                 return (0);
  140 
  141         resid = min(uio->uio_resid, fp->f_size - uio->uio_offset);
  142 
  143         dprintf((", resid: %d\n", resid));
  144 
  145         error = 0;
  146         while (resid) {
  147                 cn = ntfs_btocn(uio->uio_offset);
  148                 off = ntfs_btocnoff(uio->uio_offset);
  149 
  150                 toread = min(off + resid, ntfs_cntob(1));
  151 
  152                 error = bread(vp, cn, ntfs_cntob(1), NOCRED, &bp);
  153                 if (error) {
  154                         brelse(bp);
  155                         break;
  156                 }
  157 
  158                 error = uiomove(bp->b_data + off, toread - off, uio);
  159                 if(error) {
  160                         brelse(bp);
  161                         break;
  162                 }
  163                 brelse(bp);
  164 
  165                 resid -= toread - off;
  166         }
  167 
  168         return (error);
  169 }
  170 
  171 static int
  172 ntfs_getattr(ap)
  173         struct vop_getattr_args /* {
  174                 struct vnode *a_vp;
  175                 struct vattr *a_vap;
  176                 struct ucred *a_cred;
  177                 struct thread *a_td;
  178         } */ *ap;
  179 {
  180         register struct vnode *vp = ap->a_vp;
  181         register struct fnode *fp = VTOF(vp);
  182         register struct ntnode *ip = FTONT(fp);
  183         register struct vattr *vap = ap->a_vap;
  184 
  185         dprintf(("ntfs_getattr: %d, flags: %d\n",ip->i_number,ip->i_flag));
  186 
  187         vap->va_fsid = dev2udev(ip->i_dev);
  188         vap->va_fileid = ip->i_number;
  189         vap->va_mode = ip->i_mp->ntm_mode;
  190         vap->va_nlink = (ip->i_nlink || ip->i_flag & IN_LOADED ? ip->i_nlink : 1);
  191         vap->va_uid = ip->i_mp->ntm_uid;
  192         vap->va_gid = ip->i_mp->ntm_gid;
  193         vap->va_rdev = 0;                               /* XXX UNODEV ? */
  194         vap->va_size = fp->f_size;
  195         vap->va_bytes = fp->f_allocated;
  196         vap->va_atime = ntfs_nttimetounix(fp->f_times.t_access);
  197         vap->va_mtime = ntfs_nttimetounix(fp->f_times.t_write);
  198         vap->va_ctime = ntfs_nttimetounix(fp->f_times.t_create);
  199         vap->va_flags = ip->i_flag;
  200         vap->va_gen = 0;
  201         vap->va_blocksize = ip->i_mp->ntm_spc * ip->i_mp->ntm_bps;
  202         vap->va_type = vp->v_type;
  203         vap->va_filerev = 0;
  204         return (0);
  205 }
  206 
  207 /*
  208  * Last reference to an ntnode.  If necessary, write or delete it.
  209  */
  210 int
  211 ntfs_inactive(ap)
  212         struct vop_inactive_args /* {
  213                 struct vnode *a_vp;
  214         } */ *ap;
  215 {
  216         register struct vnode *vp = ap->a_vp;
  217 #ifdef NTFS_DEBUG
  218         register struct ntnode *ip = VTONT(vp);
  219 #endif
  220 
  221         dprintf(("ntfs_inactive: vnode: %p, ntnode: %d\n", vp, ip->i_number));
  222 
  223         if (ntfs_prtactive && vrefcnt(vp) != 0)
  224                 vprint("ntfs_inactive: pushing active", vp);
  225 
  226         /* XXX since we don't support any filesystem changes
  227          * right now, nothing more needs to be done
  228          */
  229         return (0);
  230 }
  231 
  232 /*
  233  * Reclaim an fnode/ntnode so that it can be used for other purposes.
  234  */
  235 int
  236 ntfs_reclaim(ap)
  237         struct vop_reclaim_args /* {
  238                 struct vnode *a_vp;
  239         } */ *ap;
  240 {
  241         register struct vnode *vp = ap->a_vp;
  242         register struct fnode *fp = VTOF(vp);
  243         register struct ntnode *ip = FTONT(fp);
  244         int error;
  245 
  246         dprintf(("ntfs_reclaim: vnode: %p, ntnode: %d\n", vp, ip->i_number));
  247 
  248         if (ntfs_prtactive && vrefcnt(vp) != 0)
  249                 vprint("ntfs_reclaim: pushing active", vp);
  250 
  251         /*
  252          * Destroy the vm object and flush associated pages.
  253          */
  254         vnode_destroy_vobject(vp);
  255 
  256         if ((error = ntfs_ntget(ip)) != 0)
  257                 return (error);
  258         
  259         /* Purge old data structures associated with the inode. */
  260         ntfs_frele(fp);
  261         ntfs_ntput(ip);
  262         vp->v_data = NULL;
  263 
  264         return (0);
  265 }
  266 
  267 /*
  268  * Calculate the logical to physical mapping if not done already,
  269  * then call the device strategy routine.
  270  */
  271 int
  272 ntfs_strategy(ap)
  273         struct vop_strategy_args /* {
  274                 struct buf *a_bp;
  275         } */ *ap;
  276 {
  277         register struct buf *bp = ap->a_bp;
  278         register struct vnode *vp = ap->a_vp;
  279         register struct fnode *fp = VTOF(vp);
  280         register struct ntnode *ip = FTONT(fp);
  281         struct ntfsmount *ntmp = ip->i_mp;
  282         int error;
  283 
  284         dprintf(("ntfs_strategy: offset: %d, blkno: %d, lblkno: %d\n",
  285                 (u_int32_t)bp->b_offset,(u_int32_t)bp->b_blkno,
  286                 (u_int32_t)bp->b_lblkno));
  287 
  288         dprintf(("strategy: bcount: %d flags: 0x%lx\n", 
  289                 (u_int32_t)bp->b_bcount,bp->b_flags));
  290 
  291         if (bp->b_iocmd == BIO_READ) {
  292                 u_int32_t toread;
  293 
  294                 if (ntfs_cntob(bp->b_blkno) >= fp->f_size) {
  295                         clrbuf(bp);
  296                         error = 0;
  297                 } else {
  298                         toread = min(bp->b_bcount,
  299                                  fp->f_size-ntfs_cntob(bp->b_blkno));
  300                         dprintf(("ntfs_strategy: toread: %d, fsize: %d\n",
  301                                 toread,(u_int32_t)fp->f_size));
  302 
  303                         error = ntfs_readattr(ntmp, ip, fp->f_attrtype,
  304                                 fp->f_attrname, ntfs_cntob(bp->b_blkno),
  305                                 toread, bp->b_data, NULL);
  306 
  307                         if (error) {
  308                                 printf("ntfs_strategy: ntfs_readattr failed\n");
  309                                 bp->b_error = error;
  310                                 bp->b_ioflags |= BIO_ERROR;
  311                         }
  312 
  313                         bzero(bp->b_data + toread, bp->b_bcount - toread);
  314                 }
  315         } else {
  316                 size_t tmp;
  317                 u_int32_t towrite;
  318 
  319                 if (ntfs_cntob(bp->b_blkno) + bp->b_bcount >= fp->f_size) {
  320                         printf("ntfs_strategy: CAN'T EXTEND FILE\n");
  321                         bp->b_error = error = EFBIG;
  322                         bp->b_ioflags |= BIO_ERROR;
  323                 } else {
  324                         towrite = min(bp->b_bcount,
  325                                 fp->f_size-ntfs_cntob(bp->b_blkno));
  326                         dprintf(("ntfs_strategy: towrite: %d, fsize: %d\n",
  327                                 towrite,(u_int32_t)fp->f_size));
  328 
  329                         error = ntfs_writeattr_plain(ntmp, ip, fp->f_attrtype,  
  330                                 fp->f_attrname, ntfs_cntob(bp->b_blkno),towrite,
  331                                 bp->b_data, &tmp, NULL);
  332 
  333                         if (error) {
  334                                 printf("ntfs_strategy: ntfs_writeattr fail\n");
  335                                 bp->b_error = error;
  336                                 bp->b_ioflags |= BIO_ERROR;
  337                         }
  338                 }
  339         }
  340         bufdone(bp);
  341         return (error);
  342 }
  343 
  344 static int
  345 ntfs_write(ap)
  346         struct vop_write_args /* {
  347                 struct vnode *a_vp;
  348                 struct uio *a_uio;
  349                 int  a_ioflag;
  350                 struct ucred *a_cred;
  351         } */ *ap;
  352 {
  353         register struct vnode *vp = ap->a_vp;
  354         register struct fnode *fp = VTOF(vp);
  355         register struct ntnode *ip = FTONT(fp);
  356         struct uio *uio = ap->a_uio;
  357         struct ntfsmount *ntmp = ip->i_mp;
  358         u_int64_t towrite;
  359         size_t written;
  360         int error;
  361 
  362         dprintf(("ntfs_write: ino: %d, off: %d resid: %d, segflg: %d\n",ip->i_number,(u_int32_t)uio->uio_offset,uio->uio_resid,uio->uio_segflg));
  363         dprintf(("ntfs_write: filesize: %d",(u_int32_t)fp->f_size));
  364 
  365         if (uio->uio_resid + uio->uio_offset > fp->f_size) {
  366                 printf("ntfs_write: CAN'T WRITE BEYOND END OF FILE\n");
  367                 return (EFBIG);
  368         }
  369 
  370         towrite = min(uio->uio_resid, fp->f_size - uio->uio_offset);
  371 
  372         dprintf((", towrite: %d\n",(u_int32_t)towrite));
  373 
  374         error = ntfs_writeattr_plain(ntmp, ip, fp->f_attrtype,
  375                 fp->f_attrname, uio->uio_offset, towrite, NULL, &written, uio);
  376 #ifdef NTFS_DEBUG
  377         if (error)
  378                 printf("ntfs_write: ntfs_writeattr failed: %d\n", error);
  379 #endif
  380 
  381         return (error);
  382 }
  383 
  384 int
  385 ntfs_access(ap)
  386         struct vop_access_args /* {
  387                 struct vnode *a_vp;
  388                 int  a_mode;
  389                 struct ucred *a_cred;
  390                 struct thread *a_td;
  391         } */ *ap;
  392 {
  393         struct vnode *vp = ap->a_vp;
  394         struct ntnode *ip = VTONT(vp);
  395         mode_t mode = ap->a_mode;
  396 #ifdef QUOTA
  397         int error;
  398 #endif
  399 
  400         dprintf(("ntfs_access: %d\n",ip->i_number));
  401 
  402         /*
  403          * Disallow write attempts on read-only filesystems;
  404          * unless the file is a socket, fifo, or a block or
  405          * character device resident on the filesystem.
  406          */
  407         if (mode & VWRITE) {
  408                 switch ((int)vp->v_type) {
  409                 case VDIR:
  410                 case VLNK:
  411                 case VREG:
  412                         if (vp->v_mount->mnt_flag & MNT_RDONLY)
  413                                 return (EROFS);
  414 #ifdef QUOTA
  415                         if (error = getinoquota(ip))
  416                                 return (error);
  417 #endif
  418                         break;
  419                 }
  420         }
  421 
  422         return (vaccess(vp->v_type, ip->i_mp->ntm_mode, ip->i_mp->ntm_uid,
  423             ip->i_mp->ntm_gid, ap->a_mode, ap->a_cred, NULL));
  424 } 
  425 
  426 /*
  427  * Open called.
  428  *
  429  * Nothing to do.
  430  */
  431 /* ARGSUSED */
  432 static int
  433 ntfs_open(ap)
  434         struct vop_open_args /* {
  435                 struct vnode *a_vp;
  436                 int  a_mode;
  437                 struct ucred *a_cred;
  438                 struct thread *a_td;
  439         } */ *ap;
  440 {
  441 #if NTFS_DEBUG
  442         register struct vnode *vp = ap->a_vp;
  443         register struct ntnode *ip = VTONT(vp);
  444 
  445         printf("ntfs_open: %d\n",ip->i_number);
  446 #endif
  447 
  448         vnode_create_vobject_off(ap->a_vp, VTOF(ap->a_vp)->f_size, ap->a_td);
  449 
  450         /*
  451          * Files marked append-only must be opened for appending.
  452          */
  453 
  454         return (0);
  455 }
  456 
  457 /*
  458  * Close called.
  459  *
  460  * Update the times on the inode.
  461  */
  462 /* ARGSUSED */
  463 static int
  464 ntfs_close(ap)
  465         struct vop_close_args /* {
  466                 struct vnode *a_vp;
  467                 int  a_fflag;
  468                 struct ucred *a_cred;
  469                 struct thread *a_td;
  470         } */ *ap;
  471 {
  472 #if NTFS_DEBUG
  473         register struct vnode *vp = ap->a_vp;
  474         register struct ntnode *ip = VTONT(vp);
  475 
  476         printf("ntfs_close: %d\n",ip->i_number);
  477 #endif
  478 
  479         return (0);
  480 }
  481 
  482 int
  483 ntfs_readdir(ap)
  484         struct vop_readdir_args /* {
  485                 struct vnode *a_vp;
  486                 struct uio *a_uio;
  487                 struct ucred *a_cred;
  488                 int *a_ncookies;
  489                 u_int **cookies;
  490         } */ *ap;
  491 {
  492         register struct vnode *vp = ap->a_vp;
  493         register struct fnode *fp = VTOF(vp);
  494         register struct ntnode *ip = FTONT(fp);
  495         struct uio *uio = ap->a_uio;
  496         struct ntfsmount *ntmp = ip->i_mp;
  497         int i, j, error = 0;
  498         wchar c;
  499         u_int32_t faked = 0, num;
  500         int ncookies = 0;
  501         struct dirent cde;
  502         off_t off;
  503 
  504         dprintf(("ntfs_readdir %d off: %d resid: %d\n",ip->i_number,(u_int32_t)uio->uio_offset,uio->uio_resid));
  505 
  506         off = uio->uio_offset;
  507 
  508         /* Simulate . in every dir except ROOT */
  509         if( ip->i_number != NTFS_ROOTINO ) {
  510                 struct dirent dot = { NTFS_ROOTINO,
  511                                 sizeof(struct dirent), DT_DIR, 1, "." };
  512 
  513                 if( uio->uio_offset < sizeof(struct dirent) ) {
  514                         dot.d_fileno = ip->i_number;
  515                         error = uiomove((char *)&dot,sizeof(struct dirent),uio);
  516                         if(error)
  517                                 return (error);
  518 
  519                         ncookies ++;
  520                 }
  521         }
  522 
  523         /* Simulate .. in every dir including ROOT */
  524         if( uio->uio_offset < 2 * sizeof(struct dirent) ) {
  525                 struct dirent dotdot = { NTFS_ROOTINO,
  526                                 sizeof(struct dirent), DT_DIR, 2, ".." };
  527 
  528                 error = uiomove((char *)&dotdot,sizeof(struct dirent),uio);
  529                 if(error)
  530                         return (error);
  531 
  532                 ncookies ++;
  533         }
  534 
  535         faked = (ip->i_number == NTFS_ROOTINO) ? 1 : 2;
  536         num = uio->uio_offset / sizeof(struct dirent) - faked;
  537 
  538         while( uio->uio_resid >= sizeof(struct dirent) ) {
  539                 struct attr_indexentry *iep;
  540 
  541                 error = ntfs_ntreaddir(ntmp, fp, num, &iep);
  542 
  543                 if(error)
  544                         return (error);
  545 
  546                 if( NULL == iep )
  547                         break;
  548 
  549                 for(; !(iep->ie_flag & NTFS_IEFLAG_LAST) && (uio->uio_resid >= sizeof(struct dirent));
  550                         iep = NTFS_NEXTREC(iep, struct attr_indexentry *))
  551                 {
  552                         if(!ntfs_isnamepermitted(ntmp,iep))
  553                                 continue;
  554 
  555                         for(i=0, j=0; i<iep->ie_fnamelen; i++, j++) {
  556                                 c = NTFS_U28(iep->ie_fname[i]);
  557                                 if (c&0xFF00)
  558                                         cde.d_name[j++] = (char)(c>>8);
  559                                 cde.d_name[j] = (char)c&0xFF;
  560                         }
  561                         cde.d_name[j] = '\0';
  562                         dprintf(("ntfs_readdir: elem: %d, fname:[%s] type: %d, flag: %d, ",
  563                                 num, cde.d_name, iep->ie_fnametype,
  564                                 iep->ie_flag));
  565                         cde.d_namlen = j;
  566                         cde.d_fileno = iep->ie_number;
  567                         cde.d_type = (iep->ie_fflag & NTFS_FFLAG_DIR) ? DT_DIR : DT_REG;
  568                         cde.d_reclen = sizeof(struct dirent);
  569                         dprintf(("%s\n", (cde.d_type == DT_DIR) ? "dir":"reg"));
  570 
  571                         error = uiomove((char *)&cde, sizeof(struct dirent), uio);
  572                         if(error)
  573                                 return (error);
  574 
  575                         ncookies++;
  576                         num++;
  577                 }
  578         }
  579 
  580         dprintf(("ntfs_readdir: %d entries (%d bytes) read\n",
  581                 ncookies,(u_int)(uio->uio_offset - off)));
  582         dprintf(("ntfs_readdir: off: %d resid: %d\n",
  583                 (u_int32_t)uio->uio_offset,uio->uio_resid));
  584 
  585         if (!error && ap->a_ncookies != NULL) {
  586                 struct dirent* dpStart;
  587                 struct dirent* dp;
  588                 u_long *cookies;
  589                 u_long *cookiep;
  590 
  591                 ddprintf(("ntfs_readdir: %d cookies\n",ncookies));
  592                 if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1)
  593                         panic("ntfs_readdir: unexpected uio from NFS server");
  594                 dpStart = (struct dirent *)
  595                      ((caddr_t)uio->uio_iov->iov_base -
  596                          (uio->uio_offset - off));
  597                 MALLOC(cookies, u_long *, ncookies * sizeof(u_long),
  598                        M_TEMP, M_WAITOK);
  599                 for (dp = dpStart, cookiep = cookies, i=0;
  600                      i < ncookies;
  601                      dp = (struct dirent *)((caddr_t) dp + dp->d_reclen), i++) {
  602                         off += dp->d_reclen;
  603                         *cookiep++ = (u_int) off;
  604                 }
  605                 *ap->a_ncookies = ncookies;
  606                 *ap->a_cookies = cookies;
  607         }
  608 /*
  609         if (ap->a_eofflag)
  610             *ap->a_eofflag = VTONT(ap->a_vp)->i_size <= uio->uio_offset;
  611 */
  612         return (error);
  613 }
  614 
  615 int
  616 ntfs_lookup(ap)
  617         struct vop_cachedlookup_args /* {
  618                 struct vnode *a_dvp;
  619                 struct vnode **a_vpp;
  620                 struct componentname *a_cnp;
  621         } */ *ap;
  622 {
  623         register struct vnode *dvp = ap->a_dvp;
  624         register struct ntnode *dip = VTONT(dvp);
  625         struct ntfsmount *ntmp = dip->i_mp;
  626         struct componentname *cnp = ap->a_cnp;
  627         struct ucred *cred = cnp->cn_cred;
  628         int error;
  629         dprintf(("ntfs_lookup: \"%.*s\" (%ld bytes) in %d\n",
  630                 (int)cnp->cn_namelen, cnp->cn_nameptr, cnp->cn_namelen,
  631                 dip->i_number));
  632 
  633         error = VOP_ACCESS(dvp, VEXEC, cred, cnp->cn_thread);
  634         if(error)
  635                 return (error);
  636 
  637         if ((cnp->cn_flags & ISLASTCN) &&
  638             (dvp->v_mount->mnt_flag & MNT_RDONLY) &&
  639             (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
  640                 return (EROFS);
  641 
  642         if(cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
  643                 dprintf(("ntfs_lookup: faking . directory in %d\n",
  644                         dip->i_number));
  645 
  646                 VREF(dvp);
  647                 *ap->a_vpp = dvp;
  648                 error = 0;
  649         } else if (cnp->cn_flags & ISDOTDOT) {
  650                 struct ntvattr *vap;
  651 
  652                 dprintf(("ntfs_lookup: faking .. directory in %d\n",
  653                          dip->i_number));
  654 
  655                 error = ntfs_ntvattrget(ntmp, dip, NTFS_A_NAME, NULL, 0, &vap);
  656                 if(error)
  657                         return (error);
  658 
  659                 VOP_UNLOCK(dvp,0,cnp->cn_thread);
  660                 dprintf(("ntfs_lookup: parentdir: %d\n",
  661                          vap->va_a_name->n_pnumber));
  662                 error = VFS_VGET(ntmp->ntm_mountp, vap->va_a_name->n_pnumber,
  663                                  LK_EXCLUSIVE, ap->a_vpp); 
  664                 ntfs_ntvattrrele(vap);
  665                 if (error) {
  666                         vn_lock(dvp,LK_EXCLUSIVE|LK_RETRY,cnp->cn_thread);
  667                         return (error);
  668                 }
  669         } else {
  670                 error = ntfs_ntlookupfile(ntmp, dvp, cnp, ap->a_vpp);
  671                 if (error) {
  672                         dprintf(("ntfs_ntlookupfile: returned %d\n", error));
  673                         return (error);
  674                 }
  675 
  676                 dprintf(("ntfs_lookup: found ino: %d\n", 
  677                         VTONT(*ap->a_vpp)->i_number));
  678         }
  679 
  680         if (cnp->cn_flags & MAKEENTRY)
  681                 cache_enter(dvp, *ap->a_vpp, cnp);
  682 
  683         return (error);
  684 }
  685 
  686 /*
  687  * Flush the blocks of a file to disk.
  688  *
  689  * This function is worthless for vnodes that represent directories. Maybe we
  690  * could just do a sync if they try an fsync on a directory file.
  691  */
  692 static int
  693 ntfs_fsync(ap)
  694         struct vop_fsync_args /* {
  695                 struct vnode *a_vp;
  696                 struct ucred *a_cred;
  697                 int a_waitfor;
  698                 struct thread *a_td;
  699         } */ *ap;
  700 {
  701         return (0);
  702 }
  703 
  704 /*
  705  * Return POSIX pathconf information applicable to NTFS filesystem
  706  */
  707 int
  708 ntfs_pathconf(ap)
  709         struct vop_pathconf_args *ap;
  710 {
  711 
  712         switch (ap->a_name) {
  713         case _PC_LINK_MAX:
  714                 *ap->a_retval = 1;
  715                 return (0);
  716         case _PC_NAME_MAX:
  717                 *ap->a_retval = NTFS_MAXFILENAME;
  718                 return (0);
  719         case _PC_PATH_MAX:
  720                 *ap->a_retval = PATH_MAX;
  721                 return (0);
  722         case _PC_CHOWN_RESTRICTED:
  723                 *ap->a_retval = 1;
  724                 return (0);
  725         case _PC_NO_TRUNC:
  726                 *ap->a_retval = 0;
  727                 return (0);
  728         default:
  729                 return (EINVAL);
  730         }
  731         /* NOTREACHED */
  732 }
  733 
  734 /*
  735  * Global vfs data structures
  736  */
  737 struct vop_vector ntfs_vnodeops = {
  738         .vop_default =          &default_vnodeops,
  739 
  740         .vop_access =           ntfs_access,
  741         .vop_bmap =             ntfs_bmap,
  742         .vop_cachedlookup =     ntfs_lookup,
  743         .vop_close =            ntfs_close,
  744         .vop_fsync =            ntfs_fsync,
  745         .vop_getattr =          ntfs_getattr,
  746         .vop_inactive =         ntfs_inactive,
  747         .vop_lookup =           vfs_cache_lookup,
  748         .vop_open =             ntfs_open,
  749         .vop_pathconf =         ntfs_pathconf,
  750         .vop_read =             ntfs_read,
  751         .vop_readdir =          ntfs_readdir,
  752         .vop_reclaim =          ntfs_reclaim,
  753         .vop_strategy =         ntfs_strategy,
  754         .vop_write =            ntfs_write,
  755 };

Cache object: fc082c951742f3033eab10cf24cfaabe


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