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cd9660_node.c

/**   $MirOS: src/sys/isofs/cd9660/cd9660_node.c,v 1.2 2008/10/31 16:07:55 tg Exp $ */
/*    $OpenBSD: cd9660_node.c,v 1.14 2003/06/02 23:28:05 millert Exp $  */
/*    $NetBSD: cd9660_node.c,v 1.17 1997/05/05 07:13:57 mycroft Exp $   */

/*-
 * Copyright (c) 2008
 *    Thorsten Glaser <tg@mirbsd.de>
 * Copyright (c) 1982, 1986, 1989, 1994
 *    The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley
 * by Pace Willisson (pace@blitz.com).  The Rock Ridge Extension
 * Support code is derived from software contributed to Berkeley
 * by Atsushi Murai (amurai@spec.co.jp).
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *    @(#)cd9660_node.c 8.5 (Berkeley) 12/5/94
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/file.h>
#include <sys/buf.h>
#include <sys/vnode.h>
#include <sys/namei.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/stat.h>
#include <sys/taitime.h>

#include <isofs/cd9660/iso.h>
#include <isofs/cd9660/cd9660_extern.h>
#include <isofs/cd9660/cd9660_node.h>
#include <isofs/cd9660/iso_rrip.h>

/*
 * Structures associated with iso_node caching.
 */
struct iso_node **isohashtbl;
u_long isohash;
#define     INOHASH(device, inum)   (((device) + ((inum)>>12)) & isohash)
struct simplelock cd9660_ihash_slock;

#ifdef ISODEVMAP
struct iso_node **idvhashtbl;
u_long idvhash;
#define     DNOHASH(device, inum)   (((device) + ((inum)>>12)) & idvhash)
#endif

extern int prtactive;   /* 1 => print out reclaim of active vnodes */

static u_int cd9660_chars2ui(u_char *, int);

/*
 * Initialize hash links for inodes and dnodes.
 */
int
cd9660_init(vfsp)
      struct vfsconf *vfsp;
{

      isohashtbl = hashinit(desiredvnodes, M_ISOFSMNT, M_WAITOK, &isohash);
      simple_lock_init(&cd9660_ihash_slock);
#ifdef ISODEVMAP
      idvhashtbl = hashinit(desiredvnodes / 8, M_ISOFSMNT, M_WAITOK, &idvhash);
#endif
      return (0);
}

#ifdef ISODEVMAP
/*
 * Enter a new node into the device hash list
 */
struct iso_dnode *
iso_dmap(device, inum, create)
      dev_t device;
      ino_t inum;
      int   create;
{
      register struct iso_dnode **dpp, *dp, *dq;

      dpp = &idvhashtbl[DNOHASH(device, inum)];
      for (dp = *dpp;; dp = dp->d_next) {
            if (dp == NULL)
                  return (NULL);
            if (inum == dp->i_number && device == dp->i_dev)
                  return (dp);
      }

      if (!create)
            return (NULL);

      MALLOC(dp, struct iso_dnode *, sizeof(struct iso_dnode), M_CACHE,
             M_WAITOK);
      dp->i_dev = dev;
      dp->i_number = ino;

      if (dq = *dpp)
            dq->d_prev = dp->d_next;
      dp->d_next = dq;
      dp->d_prev = dpp;
      *dpp = dp;

      return (dp);
}

void
iso_dunmap(device)
      dev_t device;
{
      struct iso_dnode **dpp, *dp, *dq;
      
      for (dpp = idvhashtbl; dpp <= idvhashtbl + idvhash; dpp++) {
            for (dp = *dpp; dp != NULL; dp = dq) {
                  dq = dp->d_next;
                  if (device == dp->i_dev) {
                        if (dq)
                              dq->d_prev = dp->d_prev;
                        *dp->d_prev = dq;
                        FREE(dp, M_CACHE);
                  }
            }
      }
}
#endif

/*
 * Use the device/inum pair to find the incore inode, and return a pointer
 * to it. If it is in core, but locked, wait for it.
 */
struct vnode *
cd9660_ihashget(dev, inum)
      dev_t dev;
      ino_t inum;
{
      struct proc *p = curproc;               /* XXX */
      struct iso_node *ip;
      struct vnode *vp;

loop:
       simple_lock(&cd9660_ihash_slock);
       for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) {
               if (inum == ip->i_number && dev == ip->i_dev) {
                       vp = ITOV(ip);
                       simple_lock(&vp->v_interlock);
                       simple_unlock(&cd9660_ihash_slock);
                       if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, p))
                               goto loop;
                       return (vp);
             }
       }
       simple_unlock(&cd9660_ihash_slock);
       return (NULL);
}

/*
 * Insert the inode into the hash table, and return it locked.
 */
int
cd9660_ihashins(ip)
      struct iso_node *ip;
{
      struct proc *p = curproc;
      struct iso_node **ipp, *iq;

      simple_lock(&cd9660_ihash_slock);
      ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];

      for (iq = *ipp; iq; iq = iq->i_next) {
            if (iq->i_dev == ip->i_dev &&
                iq->i_number == ip->i_number)
                  return (EEXIST);
      }
                        
      if ((iq = *ipp) != NULL)
            iq->i_prev = &ip->i_next;
      ip->i_next = iq;
      ip->i_prev = ipp;
      *ipp = ip;
      simple_unlock(&cd9660_ihash_slock);

      lockmgr(&ip->i_lock, LK_EXCLUSIVE, 0, p);
      return (0);
}

/*
 * Remove the inode from the hash table.
 */
void
cd9660_ihashrem(ip)
      register struct iso_node *ip;
{
      register struct iso_node *iq;

      if (ip->i_prev == NULL)
            return;
      
      simple_lock(&cd9660_ihash_slock);
      if ((iq = ip->i_next) != NULL)
            iq->i_prev = ip->i_prev;
      *ip->i_prev = iq;
#ifdef DIAGNOSTIC
      ip->i_next = NULL;
      ip->i_prev = NULL;
#endif
      simple_unlock(&cd9660_ihash_slock);
}

/*
 * Last reference to an inode, write the inode out and if necessary,
 * truncate and deallocate the file.
 */
int
cd9660_inactive(v)
      void *v;
{
      struct vop_inactive_args /* {
            struct vnode *a_vp;
            struct proc *a_p;
      } */ *ap = v;
      struct vnode *vp = ap->a_vp;
      struct proc *p = ap->a_p;
      register struct iso_node *ip = VTOI(vp);
      int error = 0;
      
      if (prtactive && vp->v_usecount != 0)
            vprint("cd9660_inactive: pushing active", vp);
      
      ip->i_flag = 0;
      VOP_UNLOCK(vp, 0, p);
      /*
       * If we are done with the inode, reclaim it
       * so that it can be reused immediately.
       */
      if (ip->inode.iso_mode == 0)
            vrecycle(vp, (struct simplelock *)0, p);

      return (error);
}

/*
 * Reclaim an inode so that it can be used for other purposes.
 */
int
cd9660_reclaim(v)
      void *v;
{
      struct vop_reclaim_args /* {
            struct vnode *a_vp;
      } */ *ap = v;
      register struct vnode *vp = ap->a_vp;
      register struct iso_node *ip = VTOI(vp);
      
      if (prtactive && vp->v_usecount != 0)
            vprint("cd9660_reclaim: pushing active", vp);
      /*
       * Remove the inode from its hash chain.
       */
      cd9660_ihashrem(ip);
      /*
       * Purge old data structures associated with the inode.
       */
      cache_purge(vp);
      if (ip->i_devvp) {
            vrele(ip->i_devvp);
            ip->i_devvp = 0;
      }
      FREE(vp->v_data, M_ISOFSNODE);
      vp->v_data = NULL;
      return (0);
}

/*
 * File attributes
 */
void
cd9660_defattr(isodir, inop, bp)
      struct iso_directory_record *isodir;
      struct iso_node *inop;
      struct buf *bp;
{
      struct buf *bp2 = NULL;
      struct iso_mnt *imp;
      struct iso_extended_attributes *ap = NULL;
      int off;
      
      if (isonum_711(isodir->flags)&2) {
            inop->inode.iso_mode = S_IFDIR;
            /*
             * If we return 2, fts() will assume there are no subdirectories
             * (just links for the path and .), so instead we return 1.
             */
            inop->inode.iso_links = 1;
      } else {
            inop->inode.iso_mode = S_IFREG;
            inop->inode.iso_links = 1;
      }
      if (!bp
          && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
          && (off = isonum_711(isodir->ext_attr_length))) {
            cd9660_bufatoff(inop, (off_t)-(off << imp->im_bshift), NULL,
                       &bp2);
            bp = bp2;
      }
      if (bp) {
            ap = (struct iso_extended_attributes *)bp->b_data;
            
            if (isonum_711(ap->version) == 1) {
                  if (!(ap->perm[1]&0x10))
                        inop->inode.iso_mode |= S_IRUSR;
                  if (!(ap->perm[1]&0x40))
                        inop->inode.iso_mode |= S_IXUSR;
                  if (!(ap->perm[0]&0x01))
                        inop->inode.iso_mode |= S_IRGRP;
                  if (!(ap->perm[0]&0x04))
                        inop->inode.iso_mode |= S_IXGRP;
                  if (!(ap->perm[0]&0x10))
                        inop->inode.iso_mode |= S_IROTH;
                  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? */
            } else
                  ap = NULL;
      }
      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;
      }
      if (bp2)
            brelse(bp2);
}

/*
 * Time stamps
 */
void
cd9660_deftstamp(isodir,inop,bp)
      struct iso_directory_record *isodir;
      struct iso_node *inop;
      struct buf *bp;
{
      struct buf *bp2 = NULL;
      struct iso_mnt *imp;
      struct iso_extended_attributes *ap = NULL;
      int off;
      
      if (!bp
          && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
          && (off = isonum_711(isodir->ext_attr_length))) {
            cd9660_bufatoff(inop, (off_t)-(off << imp->im_bshift), NULL,
                       &bp2);
            bp = bp2;
      }
      if (bp) {
            ap = (struct iso_extended_attributes *)bp->b_data;
            
            if (isonum_711(ap->version) == 1) {
                  if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
                        cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
                  if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
                        inop->inode.iso_ctime = inop->inode.iso_atime;
                  if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
                        inop->inode.iso_mtime = inop->inode.iso_ctime;
            } else
                  ap = NULL;
      }
      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;
      }
      if (bp2)
            brelse(bp2);
}

int
cd9660_tstamp_conv7(u_char *pi, struct timespec *pu)
{
      struct tm tm;

      tm.tm_year = pi[0];
      tm.tm_mon = pi[1] - 1;
      tm.tm_mday = pi[2];
      tm.tm_hour = pi[3];
      tm.tm_min = pi[4];
      tm.tm_sec = pi[5];
      tm.tm_gmtoff = (signed char)pi[6];

      /* timezone offset is unreliable on some disks */
      if (-48 <= tm.tm_gmtoff && tm.tm_gmtoff <= 52)
            tm.tm_gmtoff *= 15 * 60;
      else
            tm.tm_gmtoff = 0;

      pu->tv_sec = tai2timet(mjd2tai(tm2mjd(tm)));
      pu->tv_nsec = 0;
      return (1);
}

static u_int
cd9660_chars2ui(begin,len)
      u_char *begin;
      int len;
{
      u_int rc;
      
      for (rc = 0; --len >= 0;) {
            rc *= 10;
            rc += *begin++ - '0';
      }
      return (rc);
}

int
cd9660_tstamp_conv17(u_char *pi, struct timespec *pu)
{
      struct tm tm;

      /* year:"0001"-"9999" -> -1900  */
      tm.tm_year = cd9660_chars2ui(pi,4) - 1900;
      
      /* month: " 1"-"12"      -> 0 - 11 */
      tm.tm_mon = cd9660_chars2ui(pi + 4,2) - 1;
      
      /* day:   " 1"-"31"      -> 1 - 31 */
      tm.tm_mday = cd9660_chars2ui(pi + 6,2);
      
      /* hour:  " 0"-"23"      -> 0 - 23 */
      tm.tm_hour = cd9660_chars2ui(pi + 8,2);
      
      /* minute:" 0"-"59"      -> 0 - 59 */
      tm.tm_min = cd9660_chars2ui(pi + 10,2);
      
      /* second:" 0"-"59"      -> 0 - 60 */
      tm.tm_sec = cd9660_chars2ui(pi + 12,2);
      
      /* difference of GMT */
      tm.tm_gmtoff = (signed char)pi[16];
      /* timezone offset is unreliable on some disks */
      if (-48 <= tm.tm_gmtoff && tm.tm_gmtoff <= 52)
            tm.tm_gmtoff *= 15 * 60;
      else
            tm.tm_gmtoff = 0;
      
      pu->tv_sec = tai2timet(mjd2tai(tm2mjd(tm)));
      pu->tv_nsec = 0;
      return (1);
}

ino_t
isodirino(isodir, imp)
      struct iso_directory_record *isodir;
      struct iso_mnt *imp;
{
      ino_t ino;

      ino = (isonum_733(isodir->extent) +
          isonum_711(isodir->ext_attr_length)) << imp->im_bshift;
      return (ino);
}

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