cd9660_vnops.c

早期freebsd实现

		}
		/*
		 * Get pointer to next entry.
		 */
		
		ep = (struct iso_directory_record *)
			(bp->b_un.b_addr + entryoffsetinblock);
		
		reclen = isonum_711 (ep->length);
		if (reclen == 0) {
			/* skip to next block, if any */
			idp->curroff = roundup (idp->curroff,
						imp->logical_block_size);
			continue;
		}
		
		if (reclen < ISO_DIRECTORY_RECORD_SIZE) {
			error = EINVAL;
			/* illegal entry, stop */
			break;
		}
		
		if (entryoffsetinblock + reclen > imp->logical_block_size) {
			error = EINVAL;
			/* illegal directory, so stop looking */
			break;
		}
		
		idp->current.d_namlen = isonum_711 (ep->name_len);
		if (isonum_711(ep->flags)&2)
			isodirino(&idp->current.d_fileno,ep,imp);
		else
			idp->current.d_fileno = dbtob(bp->b_blkno) +
				idp->curroff;
		
		if (reclen < ISO_DIRECTORY_RECORD_SIZE + idp->current.d_namlen) {
			error = EINVAL;
			/* illegal entry, stop */
			break;
		}
		
		idp->curroff += reclen;
		/*
		 *
		 */
		switch (imp->iso_ftype) {
		case ISO_FTYPE_RRIP:
			cd9660_rrip_getname(ep,idp->current.d_name,
					   (u_short *)&idp->current.d_namlen,
					   &idp->current.d_fileno,imp);
			if (idp->current.d_namlen)
				error = iso_uiodir(idp,&idp->current,idp->curroff);
			break;
		default:	/* ISO_FTYPE_DEFAULT || ISO_FTYPE_9660 */
			strcpy(idp->current.d_name,"..");
			switch (ep->name[0]) {
			case 0:
				idp->current.d_namlen = 1;
				error = iso_uiodir(idp,&idp->current,idp->curroff);
				break;
			case 1:
				idp->current.d_namlen = 2;
				error = iso_uiodir(idp,&idp->current,idp->curroff);
				break;
			default:
				isofntrans(ep->name,idp->current.d_namlen,
					   idp->current.d_name, &elen,
					   imp->iso_ftype == ISO_FTYPE_9660,
					   isonum_711(ep->flags)&4);
				idp->current.d_namlen = (u_char)elen;
				if (imp->iso_ftype == ISO_FTYPE_DEFAULT)
					error = iso_shipdir(idp);
				else
					error = iso_uiodir(idp,&idp->current,idp->curroff);
				break;
			}
		}
		if (error)
			break;
		
		entryoffsetinblock += reclen;
	}
	
	if (!error && imp->iso_ftype == ISO_FTYPE_DEFAULT) {
		idp->current.d_namlen = 0;
		error = iso_shipdir(idp);
	}
	if (error < 0)
		error = 0;
	
	if (bp)
		brelse (bp);

	uio->uio_offset = idp->uio_off;
#if 0
	*eofflagp = idp->eof;
#endif
	
	FREE(idp,M_TEMP);
	
	return (error);
}

/*
 * Return target name of a symbolic link
 * Shouldn't we get the parent vnode and read the data from there?
 * This could eventually result in deadlocks in cd9660_lookup.
 * But otherwise the block read here is in the block buffer two times.
 */
typedef struct iso_directory_record ISODIR;
typedef struct iso_node             ISONODE;
typedef struct iso_mnt              ISOMNT;
int
cd9660_readlink(ap)
	struct vop_readlink_args /* {
		struct vnode *a_vp;
		struct uio *a_uio;
		struct ucred *a_cred;
	} */ *ap;
{
	ISONODE	*ip;
	ISODIR	*dirp;                   
	ISOMNT	*imp;
	struct	buf *bp;
	u_short	symlen;
	int	error;
	char	*symname;
	ino_t	ino;
	
	ip  = VTOI(ap->a_vp);
	imp = ip->i_mnt;
	
	if (imp->iso_ftype != ISO_FTYPE_RRIP)
		return EINVAL;
	
	/*
	 * Get parents directory record block that this inode included.
	 */
	error = bread(imp->im_devvp,
		      (daddr_t)(ip->i_number / DEV_BSIZE),
		      imp->logical_block_size,
		      NOCRED,
		      &bp);
	if (error) {
		brelse(bp);
		return EINVAL;
	}

	/*
	 * Setup the directory pointer for this inode
	 */
	dirp = (ISODIR *)(bp->b_un.b_addr + (ip->i_number & imp->im_bmask));
#ifdef DEBUG
	printf("lbn=%d,off=%d,bsize=%d,DEV_BSIZE=%d, dirp= %08x, b_addr=%08x, offset=%08x(%08x)\n",
	       (daddr_t)(ip->i_number >> imp->im_bshift),
	       ip->i_number & imp->im_bmask,
	       imp->logical_block_size,
	       DEV_BSIZE,
	       dirp,
	       bp->b_un.b_addr,
	       ip->i_number,
	       ip->i_number & imp->im_bmask );
#endif
	
	/*
	 * Just make sure, we have a right one....
	 *   1: Check not cross boundary on block
	 */
	if ((ip->i_number & imp->im_bmask) + isonum_711(dirp->length)
	    > imp->logical_block_size) {
		brelse(bp);
		return EINVAL;
	}
	
	/*
	 * Now get a buffer
	 * Abuse a namei buffer for now.
	 */
	MALLOC(symname,char *,MAXPATHLEN,M_NAMEI,M_WAITOK);
	
	/*
	 * Ok, we just gathering a symbolic name in SL record.
	 */
	if (cd9660_rrip_getsymname(dirp,symname,&symlen,imp) == 0) {
		FREE(symname,M_NAMEI);
		brelse(bp);
		return EINVAL;
	}
	/*
	 * Don't forget before you leave from home ;-)
	 */
	brelse(bp);
	
	/*
	 * return with the symbolic name to caller's.
	 */
	error = uiomove(symname,symlen,ap->a_uio);
	
	FREE(symname,M_NAMEI);
	
	return error;
}

/*
 * Ufs abort op, called after namei() when a CREATE/DELETE isn't actually
 * done. If a buffer has been saved in anticipation of a CREATE, delete it.
 */
int
cd9660_abortop(ap)
	struct vop_abortop_args /* {
		struct vnode *a_dvp;
		struct componentname *a_cnp;
	} */ *ap;
{
	if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF)
		FREE(ap->a_cnp->cn_pnbuf, M_NAMEI);
	return 0;
}

/*
 * Lock an inode.
 */
int
cd9660_lock(ap)
	struct vop_lock_args /* {
		struct vnode *a_vp;
	} */ *ap;
{
	register struct iso_node *ip = VTOI(ap->a_vp);

	ISO_ILOCK(ip);
	return 0;
}

/*
 * Unlock an inode.
 */
int
cd9660_unlock(ap)
	struct vop_unlock_args /* {
		struct vnode *a_vp;
	} */ *ap;
{
	register struct iso_node *ip = VTOI(ap->a_vp);

	if (!(ip->i_flag & ILOCKED))
		panic("cd9660_unlock NOT LOCKED");
	ISO_IUNLOCK(ip);
	return 0;
}

/*
 * Check for a locked inode.
 */
int
cd9660_islocked(ap)
	struct vop_islocked_args /* {
		struct vnode *a_vp;
	} */ *ap;
{

	if (VTOI(ap->a_vp)->i_flag & ILOCKED)
		return 1;
	return 0;
}

/*
 * Calculate the logical to physical mapping if not done already,
 * then call the device strategy routine.
 */
int
cd9660_strategy(ap)
	struct vop_strategy_args /* {
		struct buf *a_bp;
	} */ *ap;
{
	register struct buf *bp = ap->a_bp;
	register struct vnode *vp = bp->b_vp;
	register struct iso_node *ip;
	int error;

	ip = VTOI(vp);
	if (vp->v_type == VBLK || vp->v_type == VCHR)
		panic("cd9660_strategy: spec");
	if (bp->b_blkno == bp->b_lblkno) {
		if (error =
		    VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL)) {
			bp->b_error = error;
			bp->b_flags |= B_ERROR;
			biodone(bp);
			return (error);
		}
		if ((long)bp->b_blkno == -1)
			clrbuf(bp);
	}
	if ((long)bp->b_blkno == -1) {
		biodone(bp);
		return (0);
	}
	vp = ip->i_devvp;
	bp->b_dev = vp->v_rdev;
	VOCALL (vp->v_op, VOFFSET(vop_strategy), ap);
	return (0);
}

/*
 * Print out the contents of an inode.
 */
int
cd9660_print(ap)
	struct vop_print_args /* {
		struct vnode *a_vp;
	} */ *ap;
{
	printf("tag VT_ISOFS, isofs vnode\n");
	return 0;
}

/*
 * Unsupported operation
 */
int
cd9660_enotsupp()
{

	return (EOPNOTSUPP);
}

/*
 * Global vfs data structures for isofs
 */
#define cd9660_create \
	((int (*) __P((struct  vop_create_args *)))cd9660_enotsupp)
#define cd9660_mknod ((int (*) __P((struct  vop_mknod_args *)))cd9660_enotsupp)
#define cd9660_setattr \
	((int (*) __P((struct  vop_setattr_args *)))cd9660_enotsupp)
#define cd9660_write ((int (*) __P((struct  vop_write_args *)))cd9660_enotsupp)
#define cd9660_fsync ((int (*) __P((struct  vop_fsync_args *)))nullop)
#define cd9660_remove \
	((int (*) __P((struct  vop_remove_args *)))cd9660_enotsupp)
#define cd9660_link ((int (*) __P((struct  vop_link_args *)))cd9660_enotsupp)
#define cd9660_rename \
	((int (*) __P((struct  vop_rename_args *)))cd9660_enotsupp)
#define cd9660_mkdir ((int (*) __P((struct  vop_mkdir_args *)))cd9660_enotsupp)
#define cd9660_rmdir ((int (*) __P((struct  vop_rmdir_args *)))cd9660_enotsupp)
#define cd9660_symlink \
	((int (*) __P((struct vop_symlink_args *)))cd9660_enotsupp)
#define cd9660_pathconf \
	((int (*) __P((struct vop_pathconf_args *)))cd9660_enotsupp)
#define cd9660_advlock \
	((int (*) __P((struct vop_advlock_args *)))cd9660_enotsupp)
#define cd9660_blkatoff \
	((int (*) __P((struct  vop_blkatoff_args *)))cd9660_enotsupp)
#define cd9660_valloc ((int(*) __P(( \
		struct vnode *pvp, \
		int mode, \
		struct ucred *cred, \
		struct vnode **vpp))) cd9660_enotsupp)
#define cd9660_vfree ((int (*) __P((struct  vop_vfree_args *)))cd9660_enotsupp)
#define cd9660_truncate \
	((int (*) __P((struct  vop_truncate_args *)))cd9660_enotsupp)
#define cd9660_update \
	((int (*) __P((struct  vop_update_args *)))cd9660_enotsupp)
#define cd9660_bwrite \
	((int (*) __P((struct  vop_bwrite_args *)))cd9660_enotsupp)

/*
 * Global vfs data structures for nfs
 */
int (**cd9660_vnodeop_p)();
struct vnodeopv_entry_desc cd9660_vnodeop_entries[] = {
	{ &vop_default_desc, vn_default_error },
	{ &vop_lookup_desc, cd9660_lookup },	/* lookup */
	{ &vop_create_desc, cd9660_create },	/* create */
	{ &vop_mknod_desc, cd9660_mknod },	/* mknod */
	{ &vop_open_desc, cd9660_open },	/* open */
	{ &vop_close_desc, cd9660_close },	/* close */
	{ &vop_access_desc, cd9660_access },	/* access */
	{ &vop_getattr_desc, cd9660_getattr },	/* getattr */
	{ &vop_setattr_desc, cd9660_setattr },	/* setattr */
	{ &vop_read_desc, cd9660_read },	/* read */
	{ &vop_write_desc, cd9660_write },	/* write */
	{ &vop_ioctl_desc, cd9660_ioctl },	/* ioctl */
	{ &vop_select_desc, cd9660_select },	/* select */
	{ &vop_mmap_desc, cd9660_mmap },	/* mmap */
	{ &vop_fsync_desc, cd9660_fsync },	/* fsync */
	{ &vop_seek_desc, cd9660_seek },	/* seek */
	{ &vop_remove_desc, cd9660_remove },	/* remove */
	{ &vop_link_desc, cd9660_link },	/* link */
	{ &vop_rename_desc, cd9660_rename },	/* rename */
	{ &vop_mkdir_desc, cd9660_mkdir },	/* mkdir */
	{ &vop_rmdir_desc, cd9660_rmdir },	/* rmdir */
	{ &vop_symlink_desc, cd9660_symlink },	/* symlink */
	{ &vop_readdir_desc, cd9660_readdir },	/* readdir */
	{ &vop_readlink_desc, cd9660_readlink },/* readlink */
	{ &vop_abortop_desc, cd9660_abortop },	/* abortop */
	{ &vop_inactive_desc, cd9660_inactive },/* inactive */
	{ &vop_reclaim_desc, cd9660_reclaim },	/* reclaim */
	{ &vop_lock_desc, cd9660_lock },	/* lock */
	{ &vop_unlock_desc, cd9660_unlock },	/* unlock */
	{ &vop_bmap_desc, cd9660_bmap },	/* bmap */
	{ &vop_strategy_desc, cd9660_strategy },/* strategy */
	{ &vop_print_desc, cd9660_print },	/* print */
	{ &vop_islocked_desc, cd9660_islocked },/* islocked */
	{ &vop_pathconf_desc, cd9660_pathconf },/* pathconf */
	{ &vop_advlock_desc, cd9660_advlock },	/* advlock */
	{ &vop_blkatoff_desc, cd9660_blkatoff },/* blkatoff */
	{ &vop_valloc_desc, cd9660_valloc },	/* valloc */
	{ &vop_vfree_desc, cd9660_vfree },	/* vfree */
	{ &vop_truncate_desc, cd9660_truncate },/* truncate */
	{ &vop_update_desc, cd9660_update },	/* update */
	{ &vop_bwrite_desc, vn_bwrite },
	{ (struct vnodeop_desc*)NULL, (int(*)())NULL }
};
struct vnodeopv_desc cd9660_vnodeop_opv_desc =
	{ &cd9660_vnodeop_p, cd9660_vnodeop_entries };

/*
 * Special device vnode ops
 */
int (**cd9660_specop_p)();
struct vnodeopv_entry_desc cd9660_specop_entries[] = {
	{ &vop_default_desc, vn_default_error },
	{ &vop_lookup_desc, spec_lookup },	/* lookup */
	{ &vop_create_desc, cd9660_create },	/* create */
	{ &vop_mknod_desc, cd9660_mknod },	/* mknod */
	{ &vop_open_desc, spec_open },		/* open */
	{ &vop_close_desc, spec_close },	/* close */
	{ &vop_access_desc, cd9660_access },	/* access */
	{ &vop_getattr_desc, cd9660_getattr },	/* getattr */
	{ &vop_setattr_desc, cd9660_setattr },	/* setattr */
	{ &vop_read_desc, spec_read },		/* read */
	{ &vop_write_desc, spec_write },	/* write */
	{ &vop_ioctl_desc, spec_ioctl },	/* ioctl */
	{ &vop_select_desc, spec_select },	/* select */
	{ &vop_mmap_desc, spec_mmap },		/* mmap */
	{ &vop_fsync_desc, spec_fsync },	/* fsync */
	{ &vop_seek_desc, spec_seek },		/* seek */
	{ &vop_remove_desc, cd9660_remove },	/* remove */
	{ &vop_link_desc, cd9660_link },	/* link */
	{ &vop_rename_desc, cd9660_rename },	/* rename */
	{ &vop_mkdir_desc, cd9660_mkdir },	/* mkdir */
	{ &vop_rmdir_desc, cd9660_rmdir },	/* rmdir */
	{ &vop_symlink_desc, cd9660_symlink },	/* symlink */
	{ &vop_readdir_desc, spec_readdir },	/* readdir */
	{ &vop_readlink_desc, spec_readlink },	/* readlink */
	{ &vop_abortop_desc, spec_abortop },	/* abortop */
	{ &vop_inactive_desc, cd9660_inactive },/* inactive */
	{ &vop_reclaim_desc, cd9660_reclaim },	/* reclaim */
	{ &vop_lock_desc, cd9660_lock },	/* lock */
	{ &vop_unlock_desc, cd9660_unlock },	/* unlock */
	{ &vop_bmap_desc, spec_bmap },		/* bmap */
		/* XXX strategy: panics, should be notsupp instead? */
	{ &vop_strategy_desc, cd9660_strategy },/* strategy */
	{ &vop_print_desc, cd9660_print },	/* print */
	{ &vop_islocked_desc, cd9660_islocked },/* islocked */
	{ &vop_pathconf_desc, spec_pathconf },	/* pathconf */
	{ &vop_advlock_desc, spec_advlock },	/* advlock */
	{ &vop_blkatoff_desc, spec_blkatoff },	/* blkatoff */
	{ &vop_valloc_desc, spec_valloc },	/* valloc */
	{ &vop_vfree_desc, spec_vfree },	/* vfree */
	{ &vop_truncate_desc, spec_truncate },	/* truncate */
	{ &vop_update_desc, cd9660_update },	/* update */
	{ &vop_bwrite_desc, vn_bwrite },
	{ (struct vnodeop_desc*)NULL, (int(*)())NULL }
};
struct vnodeopv_desc cd9660_specop_opv_desc =
	{ &cd9660_specop_p, cd9660_specop_entries };

#ifdef FIFO
int (**cd9660_fifoop_p)();
struct vnodeopv_entry_desc cd9660_fifoop_entries[] = {
	{ &vop_default_desc, vn_default_error },
	{ &vop_lookup_desc, fifo_lookup },	/* lookup */
	{ &vop_create_desc, cd9660_create },	/* create */
	{ &vop_mknod_desc, cd9660_mknod },	/* mknod */
	{ &vop_open_desc, fifo_open },		/* open */
	{ &vop_close_desc, fifo_close },	/* close */
	{ &vop_access_desc, cd9660_access },	/* access */
	{ &vop_getattr_desc, cd9660_getattr },	/* getattr */
	{ &vop_setattr_desc, cd9660_setattr },	/* setattr */
	{ &vop_read_desc, fifo_read },		/* read */
	{ &vop_write_desc, fifo_write },	/* write */
	{ &vop_ioctl_desc, fifo_ioctl },	/* ioctl */
	{ &vop_select_desc, fifo_select },	/* select */
	{ &vop_mmap_desc, fifo_mmap },		/* mmap */
	{ &vop_fsync_desc, fifo_fsync },	/* fsync */
	{ &vop_seek_desc, fifo_seek },		/* seek */
	{ &vop_remove_desc, cd9660_remove },	/* remove */
	{ &vop_link_desc, cd9660_link },	/* link */
	{ &vop_rename_desc, cd9660_rename },	/* rename */
	{ &vop_mkdir_desc, cd9660_mkdir },	/* mkdir */
	{ &vop_rmdir_desc, cd9660_rmdir },	/* rmdir */
	{ &vop_symlink_desc, cd9660_symlink },	/* symlink */
	{ &vop_readdir_desc, fifo_readdir },	/* readdir */
	{ &vop_readlink_desc, fifo_readlink },	/* readlink */
	{ &vop_abortop_desc, fifo_abortop },	/* abortop */
	{ &vop_inactive_desc, cd9660_inactive },/* inactive */
	{ &vop_reclaim_desc, cd9660_reclaim },	/* reclaim */
	{ &vop_lock_desc, cd9660_lock },	/* lock */
	{ &vop_unlock_desc, cd9660_unlock },	/* unlock */
	{ &vop_bmap_desc, fifo_bmap },		/* bmap */
	{ &vop_strategy_desc, fifo_badop },	/* strategy */
	{ &vop_print_desc, cd9660_print },	/* print */
	{ &vop_islocked_desc, cd9660_islocked },/* islocked */
	{ &vop_pathconf_desc, fifo_pathconf },	/* pathconf */
	{ &vop_advlock_desc, fifo_advlock },	/* advlock */
	{ &vop_blkatoff_desc, fifo_blkatoff },	/* blkatoff */
	{ &vop_valloc_desc, fifo_valloc },	/* valloc */
	{ &vop_vfree_desc, fifo_vfree },	/* vfree */
	{ &vop_truncate_desc, fifo_truncate },	/* truncate */
	{ &vop_update_desc, cd9660_update },	/* update */
	{ &vop_bwrite_desc, vn_bwrite },
	{ (struct vnodeop_desc*)NULL, (int(*)())NULL }
};
struct vnodeopv_desc cd9660_fifoop_opv_desc =
	{ &cd9660_fifoop_p, cd9660_fifoop_entries };
#endif /* FIFO */