root/isofs/cd9660/cd9660_node.c

DEFINITIONS

1. cd9660_init
2. iso_dmap
3. iso_dunmap
4. cd9660_ihashget
5. cd9660_ihashins
6. cd9660_ihashrem
7. cd9660_inactive
8. cd9660_reclaim
9. cd9660_defattr
10. cd9660_deftstamp
11. cd9660_tstamp_conv7
12. cd9660_chars2ui
13. cd9660_tstamp_conv17
14. isodirino

    1 /*      $OpenBSD: cd9660_node.c,v 1.19 2007/06/01 23:47:55 deraadt Exp $        */
    2 /*      $NetBSD: cd9660_node.c,v 1.17 1997/05/05 07:13:57 mycroft Exp $ */
    4 /*-
    5  * Copyright (c) 1982, 1986, 1989, 1994
    6  *      The Regents of the University of California.  All rights reserved.
    7  *
    8  * This code is derived from software contributed to Berkeley
    9  * by Pace Willisson (pace@blitz.com).  The Rock Ridge Extension
   10  * Support code is derived from software contributed to Berkeley
   11  * by Atsushi Murai (amurai@spec.co.jp).
   12  *
   13  * Redistribution and use in source and binary forms, with or without
   14  * modification, are permitted provided that the following conditions
   15  * are met:
   16  * 1. Redistributions of source code must retain the above copyright
   17  *    notice, this list of conditions and the following disclaimer.
   18  * 2. Redistributions in binary form must reproduce the above copyright
   19  *    notice, this list of conditions and the following disclaimer in the
   20  *    documentation and/or other materials provided with the distribution.
   21  * 3. Neither the name of the University nor the names of its contributors
   22  *    may be used to endorse or promote products derived from this software
   23  *    without specific prior written permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   35  * SUCH DAMAGE.
   36  *
   37  *      @(#)cd9660_node.c       8.5 (Berkeley) 12/5/94
   38  */
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/mount.h>
   43 #include <sys/proc.h>
   44 #include <sys/file.h>
   45 #include <sys/buf.h>
   46 #include <sys/vnode.h>
   47 #include <sys/namei.h>
   48 #include <sys/kernel.h>
   49 #include <sys/malloc.h>
   50 #include <sys/stat.h>
   52 #include <isofs/cd9660/iso.h>
   53 #include <isofs/cd9660/cd9660_extern.h>
   54 #include <isofs/cd9660/cd9660_node.h>
   55 #include <isofs/cd9660/iso_rrip.h>
   57 /*
   58  * Structures associated with iso_node caching.
   59  */
   60 struct iso_node **isohashtbl;
u_long isohash;
   62 #define INOHASH(device, inum)   (((device) + ((inum)>>12)) & isohash)
   63 struct simplelock cd9660_ihash_slock;
   65 #ifdef ISODEVMAP
   66 struct iso_node **idvhashtbl;
u_long idvhash;
   68 #define DNOHASH(device, inum)   (((device) + ((inum)>>12)) & idvhash)
   69 #endif
   71 extern int prtactive;   /* 1 => print out reclaim of active vnodes */
   73 static u_int cd9660_chars2ui(u_char *, int);
   75 /*
   76  * Initialize hash links for inodes and dnodes.
   77  */
   78 int
cd9660_init(vfsp)
   80         struct vfsconf *vfsp;
   81 {
isohashtbl = hashinit(desiredvnodes, M_ISOFSMNT, M_WAITOK, &isohash);
simple_lock_init(&cd9660_ihash_slock);
   85 #ifdef ISODEVMAP
idvhashtbl = hashinit(desiredvnodes / 8, M_ISOFSMNT, M_WAITOK, &idvhash);
   87 #endif
   88         return (0);
   89 }
   91 #ifdef ISODEVMAP
   92 /*
   93  * Enter a new node into the device hash list
   94  */
   95 struct iso_dnode *
iso_dmap(device, inum, create)
dev_t   device;
ino_t   inum;
   99         int     create;
  100 {
  101         register struct iso_dnode **dpp, *dp, *dq;
dpp = &idvhashtbl[DNOHASH(device, inum)];
  104         for (dp = *dpp;; dp = dp->d_next) {
  105                 if (dp == NULL)
  106                         return (NULL);
  107                 if (inum == dp->i_number && device == dp->i_dev)
  108                         return (dp);
  109         }
  111         if (!create)
  112                 return (NULL);
MALLOC(dp, struct iso_dnode *, sizeof(struct iso_dnode), M_CACHE,
M_WAITOK);
dp->i_dev = dev;
dp->i_number = ino;
  119         if (dq = *dpp)
dq->d_prev = dp->d_next;
dp->d_next = dq;
dp->d_prev = dpp;
  123         *dpp = dp;
  125         return (dp);
  126 }
  128 void
iso_dunmap(device)
dev_t device;
  131 {
  132         struct iso_dnode **dpp, *dp, *dq;
  134         for (dpp = idvhashtbl; dpp <= idvhashtbl + idvhash; dpp++) {
  135                 for (dp = *dpp; dp != NULL; dp = dq) {
dq = dp->d_next;
  137                         if (device == dp->i_dev) {
  138                                 if (dq)
dq->d_prev = dp->d_prev;
  140                                 *dp->d_prev = dq;
FREE(dp, M_CACHE);
  142                         }
  143                 }
  144         }
  145 }
  146 #endif
  148 /*
  149  * Use the device/inum pair to find the incore inode, and return a pointer
  150  * to it. If it is in core, but locked, wait for it.
  151  */
  152 struct vnode *
cd9660_ihashget(dev, inum)
dev_t dev;
ino_t inum;
  156 {
  157         struct proc *p = curproc;               /* XXX */
  158         struct iso_node *ip;
  159         struct vnode *vp;
loop:
simple_lock(&cd9660_ihash_slock);
  163        for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) {
  164                if (inum == ip->i_number && dev == ip->i_dev) {
vp = ITOV(ip);
simple_unlock(&cd9660_ihash_slock);
  167                        if (vget(vp, LK_EXCLUSIVE, p))
  168                                goto loop;
  169                        return (vp);
  170                }
  171        }
simple_unlock(&cd9660_ihash_slock);
  173        return (NULL);
  174 }
  176 /*
  177  * Insert the inode into the hash table, and return it locked.
  178  */
  179 int
cd9660_ihashins(ip)
  181         struct iso_node *ip;
  182 {
  183         struct iso_node **ipp, *iq;
simple_lock(&cd9660_ihash_slock);
ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
  188         for (iq = *ipp; iq; iq = iq->i_next) {
  189                 if (iq->i_dev == ip->i_dev &&
iq->i_number == ip->i_number)
  191                         return (EEXIST);
  192         }
  194         if ((iq = *ipp) != NULL)
iq->i_prev = &ip->i_next;
ip->i_next = iq;
ip->i_prev = ipp;
  198         *ipp = ip;
simple_unlock(&cd9660_ihash_slock);
lockmgr(&ip->i_lock, LK_EXCLUSIVE, NULL);
  203         return (0);
  204 }
  206 /*
  207  * Remove the inode from the hash table.
  208  */
  209 void
cd9660_ihashrem(ip)
  211         register struct iso_node *ip;
  212 {
  213         register struct iso_node *iq;
  215         if (ip->i_prev == NULL)
  216                 return;
simple_lock(&cd9660_ihash_slock);
  219         if ((iq = ip->i_next) != NULL)
iq->i_prev = ip->i_prev;
  221         *ip->i_prev = iq;
  222 #ifdef DIAGNOSTIC
ip->i_next = NULL;
ip->i_prev = NULL;
  225 #endif
simple_unlock(&cd9660_ihash_slock);
  227 }
  229 /*
  230  * Last reference to an inode, write the inode out and if necessary,
  231  * truncate and deallocate the file.
  232  */
  233 int
cd9660_inactive(v)
  235         void *v;
  236 {
  237         struct vop_inactive_args *ap = v;
  238         struct vnode *vp = ap->a_vp;
  239         struct proc *p = ap->a_p;
  240         register struct iso_node *ip = VTOI(vp);
  241         int error = 0;
  243 #ifdef DIAGNOSTIC
  244         if (prtactive && vp->v_usecount != 0)
vprint("cd9660_inactive: pushing active", vp);
  246 #endif
ip->i_flag = 0;
VOP_UNLOCK(vp, 0, p);
  250         /*
  251          * If we are done with the inode, reclaim it
  252          * so that it can be reused immediately.
  253          */
  254         if (ip->inode.iso_mode == 0)
vrecycle(vp, p);
  257         return (error);
  258 }
  260 /*
  261  * Reclaim an inode so that it can be used for other purposes.
  262  */
  263 int
cd9660_reclaim(v)
  265         void *v;
  266 {
  267         struct vop_reclaim_args *ap = v;
  268         register struct vnode *vp = ap->a_vp;
  269         register struct iso_node *ip = VTOI(vp);
  271 #ifdef DIAGNOSTIC
  272         if (prtactive && vp->v_usecount != 0)
vprint("cd9660_reclaim: pushing active", vp);
  274 #endif
  276         /*
  277          * Remove the inode from its hash chain.
  278          */
cd9660_ihashrem(ip);
  280         /*
  281          * Purge old data structures associated with the inode.
  282          */
cache_purge(vp);
  284         if (ip->i_devvp) {
vrele(ip->i_devvp);
ip->i_devvp = 0;
  287         }
FREE(vp->v_data, M_ISOFSNODE);
vp->v_data = NULL;
  290         return (0);
  291 }
  293 /*
  294  * File attributes
  295  */
  296 void
cd9660_defattr(isodir, inop, bp)
  298         struct iso_directory_record *isodir;
  299         struct iso_node *inop;
  300         struct buf *bp;
  301 {
  302         struct buf *bp2 = NULL;
  303         struct iso_mnt *imp;
  304         struct iso_extended_attributes *ap = NULL;
  305         int off;
  307         if (isonum_711(isodir->flags)&2) {
inop->inode.iso_mode = S_IFDIR;
  309                 /*
  310                  * If we return 2, fts() will assume there are no subdirectories
  311                  * (just links for the path and .), so instead we return 1.
  312                  */
inop->inode.iso_links = 1;
  314         } else {
inop->inode.iso_mode = S_IFREG;
inop->inode.iso_links = 1;
  317         }
  318         if (!bp
  319             && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
  320             && (off = isonum_711(isodir->ext_attr_length))) {
cd9660_bufatoff(inop, (off_t)-(off << imp->im_bshift), NULL,
  322                              &bp2);
bp = bp2;
  324         }
  325         if (bp) {
ap = (struct iso_extended_attributes *)bp->b_data;
  328                 if (isonum_711(ap->version) == 1) {
  329                         if (!(ap->perm[1]&0x10))
inop->inode.iso_mode |= S_IRUSR;
  331                         if (!(ap->perm[1]&0x40))
inop->inode.iso_mode |= S_IXUSR;
  333                         if (!(ap->perm[0]&0x01))
inop->inode.iso_mode |= S_IRGRP;
  335                         if (!(ap->perm[0]&0x04))
inop->inode.iso_mode |= S_IXGRP;
  337                         if (!(ap->perm[0]&0x10))
inop->inode.iso_mode |= S_IROTH;
  339                         if (!(ap->perm[0]&0x40))
inop->inode.iso_mode |= S_IXOTH;
inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
  343                 } else
ap = NULL;
  345         }
  346         if (!ap) {
inop->inode.iso_mode |=
S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
inop->inode.iso_uid = (uid_t)0;
inop->inode.iso_gid = (gid_t)0;
  351         }
  352         if (bp2)
brelse(bp2);
  354 }
  356 /*
  357  * Time stamps
  358  */
  359 void
cd9660_deftstamp(isodir,inop,bp)
  361         struct iso_directory_record *isodir;
  362         struct iso_node *inop;
  363         struct buf *bp;
  364 {
  365         struct buf *bp2 = NULL;
  366         struct iso_mnt *imp;
  367         struct iso_extended_attributes *ap = NULL;
  368         int off;
  370         if (!bp
  371             && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
  372             && (off = isonum_711(isodir->ext_attr_length))) {
cd9660_bufatoff(inop, (off_t)-(off << imp->im_bshift), NULL,
  374                              &bp2);
bp = bp2;
  376         }
  377         if (bp) {
ap = (struct iso_extended_attributes *)bp->b_data;
  380                 if (isonum_711(ap->version) == 1) {
  381                         if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
  383                         if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
inop->inode.iso_ctime = inop->inode.iso_atime;
  385                         if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
inop->inode.iso_mtime = inop->inode.iso_ctime;
  387                 } else
ap = NULL;
  389         }
  390         if (!ap) {
cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime);
inop->inode.iso_atime = inop->inode.iso_ctime;
inop->inode.iso_mtime = inop->inode.iso_ctime;
  394         }
  395         if (bp2)
brelse(bp2);
  397 }
  399 int
cd9660_tstamp_conv7(pi,pu)
u_char *pi;
  402         struct timespec *pu;
  403 {
  404         int crtime, days;
  405         int y, m, d, hour, minute, second;
  406         signed char tz;
y = pi[0] + 1900;
m = pi[1];
d = pi[2];
hour = pi[3];
minute = pi[4];
second = pi[5];
tz = (signed char) pi[6];
  416         if (y < 1970) {
pu->tv_sec  = 0;
pu->tv_nsec = 0;
  419                 return (0);
  420         } else {
  421 #ifdef  ORIGINAL
  422                 /* computes day number relative to Sept. 19th,1989 */
  423                 /* don't even *THINK* about changing formula. It works! */
days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
  425 #else
  426                 /*
  427                  * Changed :-) to make it relative to Jan. 1st, 1970
  428                  * and to disambiguate negative division
  429                  */
days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
  431 #endif
crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
  434                 /* timezone offset is unreliable on some disks */
  435                 if (-48 <= tz && tz <= 52)
crtime -= tz * 15 * 60;
  437         }
pu->tv_sec  = crtime;
pu->tv_nsec = 0;
  440         return (1);
  441 }
  443 static u_int
cd9660_chars2ui(begin,len)
u_char *begin;
  446         int len;
  447 {
u_int rc;
  450         for (rc = 0; --len >= 0;) {
rc *= 10;
rc += *begin++ - '0';
  453         }
  454         return (rc);
  455 }
  457 int
cd9660_tstamp_conv17(pi,pu)
u_char *pi;
  460         struct timespec *pu;
  461 {
u_char buf[7];
  464         /* year:"0001"-"9999" -> -1900  */
buf[0] = cd9660_chars2ui(pi,4) - 1900;
  467         /* month: " 1"-"12"      -> 1 - 12 */
buf[1] = cd9660_chars2ui(pi + 4,2);
  470         /* day:   " 1"-"31"      -> 1 - 31 */
buf[2] = cd9660_chars2ui(pi + 6,2);
  473         /* hour:  " 0"-"23"      -> 0 - 23 */
buf[3] = cd9660_chars2ui(pi + 8,2);
  476         /* minute:" 0"-"59"      -> 0 - 59 */
buf[4] = cd9660_chars2ui(pi + 10,2);
  479         /* second:" 0"-"59"      -> 0 - 59 */
buf[5] = cd9660_chars2ui(pi + 12,2);
  482         /* difference of GMT */
buf[6] = pi[16];
  485         return (cd9660_tstamp_conv7(buf,pu));
  486 }
ino_t
isodirino(isodir, imp)
  490         struct iso_directory_record *isodir;
  491         struct iso_mnt *imp;
  492 {
ino_t ino;
ino = (isonum_733(isodir->extent) +
isonum_711(isodir->ext_attr_length)) << imp->im_bshift;
  497         return (ino);
  498 }