[unix-history] / sys / isofs / isofs_node.c

/*
 * Copyright (c) 1982, 1986, 1989 Regents of the University of California.
 * All rights reserved.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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.
 *
 *	from: @(#)isofs_inode.c
 *	$Id: isofs_node.c,v 1.4 1993/10/25 03:39:55 rgrimes Exp $
 */

#include "param.h"
#include "systm.h"
#include "mount.h"
#include "proc.h"
#include "file.h"
#include "buf.h"
#include "vnode.h"
#include "kernel.h"
#include "malloc.h"

#include "iso.h"
#include "isofs_node.h"
#include "iso_rrip.h"

#define	INOHSZ	512
#if	((INOHSZ&(INOHSZ-1)) == 0)
#define	INOHASH(dev,ino)	(((dev)+(ino))&(INOHSZ-1))
#else
#define	INOHASH(dev,ino)	(((unsigned)((dev)+(ino)))%INOHSZ)
#endif

union iso_ihead {
	union  iso_ihead *ih_head[2];
	struct iso_node *ih_chain[2];
} iso_ihead[INOHSZ];

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

/*
 * Initialize hash links for inodes.
 */
isofs_init()
{
	register int i;
	register union iso_ihead *ih = iso_ihead;

#ifndef lint
	if (VN_MAXPRIVATE < sizeof(struct iso_node))
		panic("ihinit: too small");
#endif /* not lint */
	for (i = INOHSZ; --i >= 0; ih++) {
		ih->ih_head[0] = ih;
		ih->ih_head[1] = ih;
	}
}

/*
 * Look up a ISOFS dinode number to find its incore vnode.
 * If it is not in core, read it in from the specified device.
 * If it is in core, wait for the lock bit to clear, then
 * return the inode locked. Detection and handling of mount
 * points must be done by the calling routine.
 */
iso_iget(xp, ino, ipp, isodir)
	struct iso_node *xp;
	ino_t ino;
	struct iso_node **ipp;
	struct iso_directory_record *isodir;
{
	dev_t dev = xp->i_dev;
	struct mount *mntp = ITOV(xp)->v_mount;
	extern struct vnodeops isofs_vnodeops, spec_inodeops;
	register struct iso_node *ip, *iq;
	register struct vnode *vp;
	struct vnode *nvp;
	struct buf *bp;
	struct dinode *dp;
	union iso_ihead *ih;
	int i, error, result;
	struct iso_mnt *imp;

	ih = &iso_ihead[INOHASH(dev, ino)];
loop:
	for (ip = ih->ih_chain[0];
	     ip != (struct iso_node *)ih;
	     ip = ip->i_forw) {
		if (ino != ip->i_number || dev != ip->i_dev)
			continue;
		if ((ip->i_flag&ILOCKED) != 0) {
			ip->i_flag |= IWANT;
			tsleep((caddr_t)ip, PINOD, "isoiget", 0);
			goto loop;
		}
		if (vget(ITOV(ip)))
			goto loop;
		*ipp = ip;
		return(0);
	}
	/*
	 * Allocate a new inode.
	 */
	if (error = getnewvnode(VT_ISOFS, mntp, &isofs_vnodeops, &nvp)) {
		*ipp = 0;
		return (error);
	}
	ip = VTOI(nvp);
	ip->i_vnode = nvp;
	ip->i_flag = 0;
	ip->i_devvp = 0;
	ip->i_diroff = 0;
	ip->iso_parent = xp->i_diroff; /* Parent directory's */
	ip->iso_parent_ext = xp->iso_extent;
	ip->i_lockf = 0;
	/*
	 * Put it onto its hash chain and lock it so that other requests for
	 * this inode will block if they arrive while we are sleeping waiting
	 * for old data structures to be purged or for the contents of the
	 * disk portion of this inode to be read.
	 */
	ip->i_dev = dev;
	ip->i_number = ino;
	insque(ip, ih);
	ISO_ILOCK(ip);

	ip->iso_reclen = isonum_711 (isodir->length);
	ip->iso_extlen = isonum_711 (isodir->ext_attr_length);
	ip->iso_extent = isonum_733 (isodir->extent);
	ip->i_size = isonum_733 (isodir->size);
	ip->iso_flags = isonum_711 (isodir->flags);
	ip->iso_unit_size = isonum_711 (isodir->file_unit_size);
	ip->iso_interleave_gap = isonum_711 (isodir->interleave);
	ip->iso_volume_seq = isonum_723 (isodir->volume_sequence_number);
	ip->iso_namelen = isonum_711 (isodir->name_len);

	imp = VFSTOISOFS (mntp);
	vp = ITOV(ip);
	/*
	 * Setup time stamp, attribute , if CL or PL, set loc but not yet..
	 */
	switch ( imp->iso_ftype ) {
		case ISO_FTYPE_9660:
			isofs_rrip_defattr  ( isodir, &(ip->inode) );
			isofs_rrip_deftstamp( isodir, &(ip->inode) );
			goto FlameOff;
			break;  
		case ISO_FTYPE_RRIP:
			result = isofs_rrip_analyze( isodir, &(ip->inode) );
			break;  
		default:
			printf("unknown iso_ftype.. %d\n", imp->iso_ftype );
			break;
	}
	/*
	 * Initialize the associated vnode
	 */
	if ( result & ISO_SUSP_SLINK ) {
		vp->v_type = VLNK;	      /* Symbolic Link */
	} else {
FlameOff:
		if (ip->iso_flags & 2) {
			vp->v_type = VDIR;
		} else {
			vp->v_type = VREG;
		}
	}

	imp = VFSTOISOFS (mntp);

	if (ino == imp->root_extent)
		vp->v_flag |= VROOT;
	/*
	 * Finish inode initialization.
	 */
	ip->i_mnt = imp;
	ip->i_devvp = imp->im_devvp;
	VREF(ip->i_devvp);
	*ipp = ip;
	return (0);
}

/*
 * Unlock and decrement the reference count of an inode structure.
 */
iso_iput(ip)
	register struct iso_node *ip;
{

	if ((ip->i_flag & ILOCKED) == 0)
		panic("iso_iput");
	ISO_IUNLOCK(ip);
	vrele(ITOV(ip));
}

/*
 * Last reference to an inode, write the inode out and if necessary,
 * truncate and deallocate the file.
 */
isofs_inactive(vp, p)
	struct vnode *vp;
	struct proc *p;
{
	register struct iso_node *ip = VTOI(vp);
	int mode, error = 0;

	if (prtactive && vp->v_usecount != 0)
		vprint("isofs_inactive: pushing active", vp);

	ip->i_flag = 0;
	/*
	 * If we are done with the inode, reclaim it
	 * so that it can be reused immediately.
	 */

	/*
	 * Purge symlink entries since they cause problems
	 * when cached.  Leave other entries alone since flushing
	 * them every time is a major performance hit.
	 */
	if (vp->v_usecount == 0 && vp->v_type == VLNK) {
/*		printf("Flushing symlink entry\n");*/
		vgone(vp);
	}
	return (error);
}

/*
 * Reclaim an inode so that it can be used for other purposes.
 */
isofs_reclaim(vp)
	register struct vnode *vp;
{
	register struct iso_node *ip = VTOI(vp);
	int i;

	if (prtactive && vp->v_usecount != 0)
		vprint("isofs_reclaim: pushing active", vp);
	/*
	 * Remove the inode from its hash chain.
	 */
	remque(ip);
	ip->i_forw = ip;
	ip->i_back = ip;
	/*
	 * Purge old data structures associated with the inode.
	 */
	cache_purge(vp);
	if (ip->i_devvp) {
		vrele(ip->i_devvp);
		ip->i_devvp = 0;
	}
	ip->i_flag = 0;
	return (0);
}

/*
 * Lock an inode. If its already locked, set the WANT bit and sleep.
 */
iso_ilock(ip)
	register struct iso_node *ip;
{

	while (ip->i_flag & ILOCKED) {
		ip->i_flag |= IWANT;
		if (ip->i_spare0 == curproc->p_pid)
			panic("locking against myself");
		ip->i_spare1 = curproc->p_pid;
		(void) tsleep((caddr_t)ip, PINOD, "isoilck", 0);
	}
	ip->i_spare1 = 0;
	ip->i_spare0 = curproc->p_pid;
	ip->i_flag |= ILOCKED;
}

/*
 * Unlock an inode.  If WANT bit is on, wakeup.
 */
iso_iunlock(ip)
	register struct iso_node *ip;
{

	if ((ip->i_flag & ILOCKED) == 0)
		vprint("iso_iunlock: unlocked inode", ITOV(ip));
	ip->i_spare0 = 0;
	ip->i_flag &= ~ILOCKED;
	if (ip->i_flag&IWANT) {
		ip->i_flag &= ~IWANT;
		wakeup((caddr_t)ip);
	}
}
Commit	Line	Data
15637ed4 RG	1	/*
	2	* Copyright (c) 1982, 1986, 1989 Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*
584fddaa	33	* from: @(#)isofs_inode.c
4630f671	34	* $Id: isofs_node.c,v 1.4 1993/10/25 03:39:55 rgrimes Exp $
15637ed4 RG	35	*/
	36
	37	#include "param.h"
	38	#include "systm.h"
	39	#include "mount.h"
	40	#include "proc.h"
	41	#include "file.h"
	42	#include "buf.h"
	43	#include "vnode.h"
	44	#include "kernel.h"
	45	#include "malloc.h"
	46
	47	#include "iso.h"
	48	#include "isofs_node.h"
584fddaa	49	#include "iso_rrip.h"
15637ed4 RG	50
	51	#define INOHSZ 512
	52	#if ((INOHSZ&(INOHSZ-1)) == 0)
	53	#define INOHASH(dev,ino) (((dev)+(ino))&(INOHSZ-1))
	54	#else
	55	#define INOHASH(dev,ino) (((unsigned)((dev)+(ino)))%INOHSZ)
	56	#endif
	57
	58	union iso_ihead {
	59	union iso_ihead *ih_head[2];
	60	struct iso_node *ih_chain[2];
	61	} iso_ihead[INOHSZ];
	62
	63	int prtactive; /* 1 => print out reclaim of active vnodes */
	64
	65	/*
	66	* Initialize hash links for inodes.
	67	*/
	68	isofs_init()
	69	{
	70	register int i;
	71	register union iso_ihead *ih = iso_ihead;
	72
	73	#ifndef lint
	74	if (VN_MAXPRIVATE < sizeof(struct iso_node))
	75	panic("ihinit: too small");
	76	#endif /* not lint */
	77	for (i = INOHSZ; --i >= 0; ih++) {
	78	ih->ih_head[0] = ih;
	79	ih->ih_head[1] = ih;
	80	}
	81	}
	82
	83	/*
	84	* Look up a ISOFS dinode number to find its incore vnode.
	85	* If it is not in core, read it in from the specified device.
	86	* If it is in core, wait for the lock bit to clear, then
	87	* return the inode locked. Detection and handling of mount
	88	* points must be done by the calling routine.
	89	*/
	90	iso_iget(xp, ino, ipp, isodir)
	91	struct iso_node *xp;
	92	ino_t ino;
	93	struct iso_node **ipp;
	94	struct iso_directory_record *isodir;
	95	{
	96	dev_t dev = xp->i_dev;
	97	struct mount *mntp = ITOV(xp)->v_mount;
	98	extern struct vnodeops isofs_vnodeops, spec_inodeops;
	99	register struct iso_node ip, iq;
	100	register struct vnode *vp;
	101	struct vnode *nvp;
	102	struct buf *bp;
	103	struct dinode *dp;
	104	union iso_ihead *ih;
584fddaa	105	int i, error, result;
15637ed4 RG	106	struct iso_mnt *imp;
	107
	108	ih = &iso_ihead[INOHASH(dev, ino)];
	109	loop:
	110	for (ip = ih->ih_chain[0];
	111	ip != (struct iso_node *)ih;
	112	ip = ip->i_forw) {
	113	if (ino != ip->i_number \|\| dev != ip->i_dev)
	114	continue;
	115	if ((ip->i_flag&ILOCKED) != 0) {
	116	ip->i_flag \|= IWANT;
4630f671	117	tsleep((caddr_t)ip, PINOD, "isoiget", 0);
15637ed4 RG	118	goto loop;
	119	}
	120	if (vget(ITOV(ip)))
	121	goto loop;
	122	*ipp = ip;
	123	return(0);
	124	}
	125	/*
	126	* Allocate a new inode.
	127	*/
	128	if (error = getnewvnode(VT_ISOFS, mntp, &isofs_vnodeops, &nvp)) {
	129	*ipp = 0;
	130	return (error);
	131	}
	132	ip = VTOI(nvp);
	133	ip->i_vnode = nvp;
	134	ip->i_flag = 0;
	135	ip->i_devvp = 0;
	136	ip->i_diroff = 0;
15637ed4 RG	137	ip->iso_parent = xp->i_diroff; /* Parent directory's */
	138	ip->iso_parent_ext = xp->iso_extent;
	139	ip->i_lockf = 0;
	140	/*
	141	* Put it onto its hash chain and lock it so that other requests for
	142	* this inode will block if they arrive while we are sleeping waiting
	143	* for old data structures to be purged or for the contents of the
	144	* disk portion of this inode to be read.
	145	*/
	146	ip->i_dev = dev;
	147	ip->i_number = ino;
	148	insque(ip, ih);
	149	ISO_ILOCK(ip);
	150
	151	ip->iso_reclen = isonum_711 (isodir->length);
	152	ip->iso_extlen = isonum_711 (isodir->ext_attr_length);
	153	ip->iso_extent = isonum_733 (isodir->extent);
	154	ip->i_size = isonum_733 (isodir->size);
15637ed4 RG	155	ip->iso_flags = isonum_711 (isodir->flags);
	156	ip->iso_unit_size = isonum_711 (isodir->file_unit_size);
	157	ip->iso_interleave_gap = isonum_711 (isodir->interleave);
	158	ip->iso_volume_seq = isonum_723 (isodir->volume_sequence_number);
	159	ip->iso_namelen = isonum_711 (isodir->name_len);
	160
584fddaa JH	161	imp = VFSTOISOFS (mntp);
	162	vp = ITOV(ip);
	163	/*
	164	* Setup time stamp, attribute , if CL or PL, set loc but not yet..
	165	*/
	166	switch ( imp->iso_ftype ) {
	167	case ISO_FTYPE_9660:
	168	isofs_rrip_defattr ( isodir, &(ip->inode) );
	169	isofs_rrip_deftstamp( isodir, &(ip->inode) );
	170	goto FlameOff;
	171	break;
	172	case ISO_FTYPE_RRIP:
	173	result = isofs_rrip_analyze( isodir, &(ip->inode) );
	174	break;
	175	default:
	176	printf("unknown iso_ftype.. %d\n", imp->iso_ftype );
	177	break;
	178	}
15637ed4 RG	179	/*
	180	* Initialize the associated vnode
	181	*/
584fddaa JH	182	if ( result & ISO_SUSP_SLINK ) {
	183	vp->v_type = VLNK; /* Symbolic Link */
	184	} else {
	185	FlameOff:
	186	if (ip->iso_flags & 2) {
	187	vp->v_type = VDIR;
	188	} else {
	189	vp->v_type = VREG;
	190	}
	191	}
15637ed4 RG	192
	193	imp = VFSTOISOFS (mntp);
	194
	195	if (ino == imp->root_extent)
	196	vp->v_flag \|= VROOT;
	197	/*
	198	* Finish inode initialization.
	199	*/
	200	ip->i_mnt = imp;
	201	ip->i_devvp = imp->im_devvp;
	202	VREF(ip->i_devvp);
	203	*ipp = ip;
	204	return (0);
	205	}
	206
	207	/*
	208	* Unlock and decrement the reference count of an inode structure.
	209	*/
	210	iso_iput(ip)
	211	register struct iso_node *ip;
	212	{
	213
	214	if ((ip->i_flag & ILOCKED) == 0)
	215	panic("iso_iput");
	216	ISO_IUNLOCK(ip);
	217	vrele(ITOV(ip));
	218	}
	219
	220	/*
	221	* Last reference to an inode, write the inode out and if necessary,
	222	* truncate and deallocate the file.
	223	*/
	224	isofs_inactive(vp, p)
	225	struct vnode *vp;
	226	struct proc *p;
	227	{
	228	register struct iso_node *ip = VTOI(vp);
	229	int mode, error = 0;
	230
	231	if (prtactive && vp->v_usecount != 0)
	232	vprint("isofs_inactive: pushing active", vp);
	233
	234	ip->i_flag = 0;
	235	/*
	236	* If we are done with the inode, reclaim it
	237	* so that it can be reused immediately.
	238	*/
e394bef8 NW	239
e394bef8 NW	240	/*
c27f072f RG	241	* Purge symlink entries since they cause problems
	242	* when cached. Leave other entries alone since flushing
	243	* them every time is a major performance hit.
e394bef8	244	*/
c27f072f RG	245	if (vp->v_usecount == 0 && vp->v_type == VLNK) {
	246	/* printf("Flushing symlink entry\n");*/
	247	vgone(vp);
	248	}
15637ed4 RG	249	return (error);
	250	}
	251
	252	/*
	253	* Reclaim an inode so that it can be used for other purposes.
	254	*/
	255	isofs_reclaim(vp)
	256	register struct vnode *vp;
	257	{
	258	register struct iso_node *ip = VTOI(vp);
	259	int i;
	260
	261	if (prtactive && vp->v_usecount != 0)
	262	vprint("isofs_reclaim: pushing active", vp);
	263	/*
	264	* Remove the inode from its hash chain.
	265	*/
	266	remque(ip);
	267	ip->i_forw = ip;
	268	ip->i_back = ip;
	269	/*
	270	* Purge old data structures associated with the inode.
	271	*/
	272	cache_purge(vp);
	273	if (ip->i_devvp) {
	274	vrele(ip->i_devvp);
	275	ip->i_devvp = 0;
	276	}
	277	ip->i_flag = 0;
	278	return (0);
	279	}
	280
	281	/*
	282	* Lock an inode. If its already locked, set the WANT bit and sleep.
	283	*/
	284	iso_ilock(ip)
	285	register struct iso_node *ip;
	286	{
	287
	288	while (ip->i_flag & ILOCKED) {
	289	ip->i_flag \|= IWANT;
	290	if (ip->i_spare0 == curproc->p_pid)
	291	panic("locking against myself");
	292	ip->i_spare1 = curproc->p_pid;
4630f671	293	(void) tsleep((caddr_t)ip, PINOD, "isoilck", 0);
15637ed4 RG	294	}
	295	ip->i_spare1 = 0;
	296	ip->i_spare0 = curproc->p_pid;
	297	ip->i_flag \|= ILOCKED;
	298	}
	299
	300	/*
	301	* Unlock an inode. If WANT bit is on, wakeup.
	302	*/
	303	iso_iunlock(ip)
	304	register struct iso_node *ip;
	305	{
	306
	307	if ((ip->i_flag & ILOCKED) == 0)
	308	vprint("iso_iunlock: unlocked inode", ITOV(ip));
	309	ip->i_spare0 = 0;
	310	ip->i_flag &= ~ILOCKED;
	311	if (ip->i_flag&IWANT) {
	312	ip->i_flag &= ~IWANT;
	313	wakeup((caddr_t)ip);
	314	}
	315	}