cd9660_vfsops.c

早期freebsd实现

		    argp->flags  &= ~ISOFSMNT_GENS;
		}
		
		/*
		 * The contents are valid,
		 * but they will get reread as part of another vnode, so...
		 */
		bp->b_flags |= B_AGE;
		brelse(bp);
		bp = NULL;
	}
	isomp->im_flags = argp->flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS|ISOFSMNT_EXTATT);
	switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) {
	default:
	    isomp->iso_ftype = ISO_FTYPE_DEFAULT;
	    break;
	case ISOFSMNT_GENS|ISOFSMNT_NORRIP:
	    isomp->iso_ftype = ISO_FTYPE_9660;
	    break;
	case 0:
	    isomp->iso_ftype = ISO_FTYPE_RRIP;
	    break;
	}
	
	return 0;
out:
	if (bp)
		brelse(bp);
	if (needclose)
		(void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
	if (isomp) {
		free((caddr_t)isomp, M_ISOFSMNT);
		mp->mnt_data = (qaddr_t)0;
	}
	return error;
}

/*
 * Make a filesystem operational.
 * Nothing to do at the moment.
 */
/* ARGSUSED */
cd9660_start(mp, flags, p)
	struct mount *mp;
	int flags;
	struct proc *p;
{
	return 0;
}

/*
 * unmount system call
 */
int
cd9660_unmount(mp, mntflags, p)
	struct mount *mp;
	int mntflags;
	struct proc *p;
{
	register struct iso_mnt *isomp;
	int i, error, ronly, flags = 0;
	
	if (mntflags & MNT_FORCE) {
		if (!iso_doforce || (mp->mnt_flag & MNT_ROOTFS))
			return (EINVAL);
		flags |= FORCECLOSE;
	}
#if 0
	mntflushbuf(mp, 0);
	if (mntinvalbuf(mp))
		return EBUSY;
#endif
	if (error = vflush(mp, NULLVP, flags))
		return (error);

	isomp = VFSTOISOFS(mp);

#ifdef	ISODEVMAP
	if (isomp->iso_ftype == ISO_FTYPE_RRIP)
		iso_dunmap(isomp->im_dev);
#endif
	
	isomp->im_devvp->v_specflags &= ~SI_MOUNTEDON;
	error = VOP_CLOSE(isomp->im_devvp, FREAD, NOCRED, p);
	vrele(isomp->im_devvp);
	free((caddr_t)isomp, M_ISOFSMNT);
	mp->mnt_data = (qaddr_t)0;
	mp->mnt_flag &= ~MNT_LOCAL;
	return (error);
}

/*
 * Return root of a filesystem
 */
cd9660_root(mp, vpp)
	struct mount *mp;
	struct vnode **vpp;
{
	register struct iso_node *ip;
	struct iso_node tip, *nip;
	struct vnode tvp;
	int error;
	struct iso_mnt *imp = VFSTOISOFS (mp);
	struct iso_directory_record *dp;
	
	tvp.v_mount = mp;
	tvp.v_data = &tip;
	ip = VTOI(&tvp);
	ip->i_vnode = &tvp;
	ip->i_dev = imp->im_dev;
	ip->i_diroff = 0;
	dp = (struct iso_directory_record *)imp->root;
	isodirino(&ip->i_number,dp,imp);
	
	/*
	 * With RRIP we must use the `.' entry of the root directory.
	 * Simply tell iget, that it's a relocated directory.
	 */
	error = iso_iget(ip,ip->i_number,
			 imp->iso_ftype == ISO_FTYPE_RRIP,
			 &nip,dp);
	if (error)
		return error;
	*vpp = ITOV(nip);
	return 0;
}

/*
 * Do operations associated with quotas, not supported
 */
/* ARGSUSED */
int
cd9660_quotactl(mp, cmd, uid, arg, p)
	struct mount *mp;
	int cmd;
	uid_t uid;
	caddr_t arg;
	struct proc *p;
{

	return (EOPNOTSUPP);
}

/*
 * Get file system statistics.
 */
cd9660_statfs(mp, sbp, p)
	struct mount *mp;
	register struct statfs *sbp;
	struct proc *p;
{
	register struct iso_mnt *isomp;
	register struct fs *fs;
	
	isomp = VFSTOISOFS(mp);
	
	sbp->f_type = MOUNT_CD9660;
	sbp->f_bsize = isomp->logical_block_size;
	sbp->f_iosize = sbp->f_bsize;	/* XXX */
	sbp->f_blocks = isomp->volume_space_size;
	sbp->f_bfree = 0; /* total free blocks */
	sbp->f_bavail = 0; /* blocks free for non superuser */
	sbp->f_files =  0; /* total files */
	sbp->f_ffree = 0; /* free file nodes */
	if (sbp != &mp->mnt_stat) {
		bcopy((caddr_t)mp->mnt_stat.f_mntonname,
			(caddr_t)&sbp->f_mntonname[0], MNAMELEN);
		bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
			(caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
	}
	/* Use the first spare for flags: */
	sbp->f_spare[0] = isomp->im_flags;
	return 0;
}

/* ARGSUSED */
int
cd9660_sync(mp, waitfor, cred, p)
	struct mount *mp;
	int waitfor;
	struct ucred *cred;
	struct proc *p;
{
	return (0);
}

/*
 * Flat namespace lookup.
 * Currently unsupported.
 */
/* ARGSUSED */
int
cd9660_vget(mp, ino, vpp)
	struct mount *mp;
	ino_t ino;
	struct vnode **vpp;
{

	return (EOPNOTSUPP);
}

/*
 * File handle to vnode
 *
 * Have to be really careful about stale file handles:
 * - check that the inode number is in range
 * - call iget() to get the locked inode
 * - check for an unallocated inode (i_mode == 0)
 * - check that the generation number matches
 */

struct ifid {
	ushort	ifid_len;
	ushort	ifid_pad;
	int	ifid_ino;
	long	ifid_start;
};

/* ARGSUSED */
int
cd9660_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp)
	register struct mount *mp;
	struct fid *fhp;
	struct mbuf *nam;
	struct vnode **vpp;
	int *exflagsp;
	struct ucred **credanonp;
{
	struct vnode			tvp;
	int				error;
	int				lbn, off;
	struct ifid			*ifhp;
	struct iso_mnt			*imp;
	struct buf			*bp;
	struct iso_directory_record	*dirp;
	struct iso_node 		tip, *ip, *nip;
	struct netcred			*np;
	
	imp = VFSTOISOFS (mp);
	ifhp = (struct ifid *)fhp;
	
#ifdef	ISOFS_DBG
	printf("fhtovp: ino %d, start %ld\n",
	       ifhp->ifid_ino, ifhp->ifid_start);
#endif
	
	np = vfs_export_lookup(mp, &imp->im_export, nam);
	if (np == NULL)
		return (EACCES);

	lbn = iso_lblkno(imp, ifhp->ifid_ino);
	if (lbn >= imp->volume_space_size) {
		printf("fhtovp: lbn exceed volume space %d\n", lbn);
		return (ESTALE);
	}
	
	off = iso_blkoff(imp, ifhp->ifid_ino);
	if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) {
		printf("fhtovp: crosses block boundary %d\n",
		       off + ISO_DIRECTORY_RECORD_SIZE);
		return (ESTALE);
	}
	
	error = bread(imp->im_devvp, btodb(lbn * imp->logical_block_size),
		      imp->logical_block_size, NOCRED, &bp);
	if (error) {
		printf("fhtovp: bread error %d\n",error);
		brelse(bp);
		return (error);
	}
	
	dirp = (struct iso_directory_record *)(bp->b_un.b_addr + off);
	if (off + isonum_711(dirp->length) > imp->logical_block_size) {
		brelse(bp);
		printf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n",
		       off+isonum_711(dirp->length), off,
		       isonum_711(dirp->length));
		return (ESTALE);
	}
	
	if (isonum_733(dirp->extent) + isonum_711(dirp->ext_attr_length) !=
	    ifhp->ifid_start) {
		brelse(bp);
		printf("fhtovp: file start miss %d vs %d\n",
		       isonum_733(dirp->extent)+isonum_711(dirp->ext_attr_length),
		       ifhp->ifid_start);
		return (ESTALE);
	}
	brelse(bp);
	
	ip = &tip;
	tvp.v_mount = mp;
	tvp.v_data = ip;
	ip->i_vnode = &tvp;
	ip->i_dev = imp->im_dev;
	if (error = iso_iget(ip, ifhp->ifid_ino, 0, &nip, dirp)) {
		*vpp = NULLVP;
		printf("fhtovp: failed to get inode\n");
		return (error);
	}
	ip = nip;
	/*
	 * XXX need generation number?
	 */
	if (ip->inode.iso_mode == 0) {
		iso_iput(ip);
		*vpp = NULLVP;
		printf("fhtovp: inode mode == 0\n");
		return (ESTALE);
	}
	*vpp = ITOV(ip);
	*exflagsp = np->netc_exflags;
	*credanonp = &np->netc_anon;
	return 0;
}

/*
 * Vnode pointer to File handle
 */
/* ARGSUSED */
cd9660_vptofh(vp, fhp)
	struct vnode *vp;
	struct fid *fhp;
{
	register struct iso_node *ip = VTOI(vp);
	register struct ifid *ifhp;
	register struct iso_mnt *mp = ip->i_mnt;
	
	ifhp = (struct ifid *)fhp;
	ifhp->ifid_len = sizeof(struct ifid);
	
	ifhp->ifid_ino = ip->i_number;
	ifhp->ifid_start = ip->iso_start;
	
#ifdef	ISOFS_DBG
	printf("vptofh: ino %d, start %ld\n",
	       ifhp->ifid_ino,ifhp->ifid_start);
#endif
	return 0;
}