[unix-history] / .ref-386BSD-0.1-patchkit / usr / src / sys.386bsd / 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.
 *
 *	@(#)isofs_inode.c
 *
 * PATCHES MAGIC                LEVEL   PATCH THAT GOT US HERE
 * --------------------         -----   ----------------------
 * CURRENT PATCH LEVEL:         1       00151
 * --------------------         -----   ----------------------
 *
 * 23 Apr 93	Jagane D Sundar		support nfs exported isofs
 */

#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"

#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;
	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;
			sleep((caddr_t)ip, PINOD);
			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;
	/* The following two are req for NFS FH. -Jagane D Sundar.- */
	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);
	bcopy (isodir->date, ip->iso_time, sizeof ip->iso_time);
	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);

	/*
	 * Initialize the associated vnode
	 */
	vp = ITOV(ip);

	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.
	 */
	if (vp->v_usecount == 0 /* && ip->i_mode == 0 */)
		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) sleep((caddr_t)ip, PINOD);
	}
	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
7977dadd WJ	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	*
	33	* @(#)isofs_inode.c
23095ad6 JS	34	*
	35	* PATCHES MAGIC LEVEL PATCH THAT GOT US HERE
	36	* -------------------- ----- ----------------------
	37	* CURRENT PATCH LEVEL: 1 00151
	38	* -------------------- ----- ----------------------
	39	*
	40	* 23 Apr 93 Jagane D Sundar support nfs exported isofs
7977dadd WJ	41	*/
	42
	43	#include "param.h"
	44	#include "systm.h"
	45	#include "mount.h"
	46	#include "proc.h"
	47	#include "file.h"
	48	#include "buf.h"
	49	#include "vnode.h"
	50	#include "kernel.h"
	51	#include "malloc.h"
	52
	53	#include "iso.h"
	54	#include "isofs_node.h"
	55
	56	#define INOHSZ 512
	57	#if ((INOHSZ&(INOHSZ-1)) == 0)
	58	#define INOHASH(dev,ino) (((dev)+(ino))&(INOHSZ-1))
	59	#else
	60	#define INOHASH(dev,ino) (((unsigned)((dev)+(ino)))%INOHSZ)
	61	#endif
	62
	63	union iso_ihead {
	64	union iso_ihead *ih_head[2];
	65	struct iso_node *ih_chain[2];
	66	} iso_ihead[INOHSZ];
	67
	68	int prtactive; /* 1 => print out reclaim of active vnodes */
	69
	70	/*
	71	* Initialize hash links for inodes.
	72	*/
	73	isofs_init()
	74	{
	75	register int i;
	76	register union iso_ihead *ih = iso_ihead;
	77
	78	#ifndef lint
	79	if (VN_MAXPRIVATE < sizeof(struct iso_node))
	80	panic("ihinit: too small");
	81	#endif /* not lint */
	82	for (i = INOHSZ; --i >= 0; ih++) {
	83	ih->ih_head[0] = ih;
	84	ih->ih_head[1] = ih;
	85	}
	86	}
	87
	88	/*
	89	* Look up a ISOFS dinode number to find its incore vnode.
	90	* If it is not in core, read it in from the specified device.
	91	* If it is in core, wait for the lock bit to clear, then
	92	* return the inode locked. Detection and handling of mount
	93	* points must be done by the calling routine.
	94	*/
	95	iso_iget(xp, ino, ipp, isodir)
	96	struct iso_node *xp;
	97	ino_t ino;
	98	struct iso_node **ipp;
	99	struct iso_directory_record *isodir;
	100	{
	101	dev_t dev = xp->i_dev;
	102	struct mount *mntp = ITOV(xp)->v_mount;
	103	extern struct vnodeops isofs_vnodeops, spec_inodeops;
	104	register struct iso_node ip, iq;
105	register struct vnode *vp;
106	struct vnode *nvp;
107	struct buf *bp;
108	struct dinode *dp;
109	union iso_ihead *ih;
110	int i, error;
111	struct iso_mnt *imp;
112
113	ih = &iso_ihead[INOHASH(dev, ino)];
114	loop:
115	for (ip = ih->ih_chain[0];
116	ip != (struct iso_node *)ih;
117	ip = ip->i_forw) {
118	if (ino != ip->i_number \|\| dev != ip->i_dev)
119	continue;
120	if ((ip->i_flag&ILOCKED) != 0) {
121	ip->i_flag \|= IWANT;
122	sleep((caddr_t)ip, PINOD);
123	goto loop;
124	}
125	if (vget(ITOV(ip)))
126	goto loop;
127	*ipp = ip;
128	return(0);
129	}
130	/*
131	* Allocate a new inode.
132	*/
133	if (error = getnewvnode(VT_ISOFS, mntp, &isofs_vnodeops, &nvp)) {
134	*ipp = 0;
135	return (error);
136	}
137	ip = VTOI(nvp);
138	ip->i_vnode = nvp;
139	ip->i_flag = 0;
140	ip->i_devvp = 0;
141	ip->i_diroff = 0;
23095ad6 JS	142	/* The following two are req for NFS FH. -Jagane D Sundar.- */
	143	ip->iso_parent = xp->i_diroff; /* Parent directory's */
	144	ip->iso_parent_ext = xp->iso_extent;
7977dadd WJ	145	ip->i_lockf = 0;
	146	/*
	147	* Put it onto its hash chain and lock it so that other requests for
	148	* this inode will block if they arrive while we are sleeping waiting
	149	* for old data structures to be purged or for the contents of the
	150	* disk portion of this inode to be read.
	151	*/
	152	ip->i_dev = dev;
	153	ip->i_number = ino;
	154	insque(ip, ih);
	155	ISO_ILOCK(ip);
	156
	157	ip->iso_reclen = isonum_711 (isodir->length);
	158	ip->iso_extlen = isonum_711 (isodir->ext_attr_length);
	159	ip->iso_extent = isonum_733 (isodir->extent);
	160	ip->i_size = isonum_733 (isodir->size);
	161	bcopy (isodir->date, ip->iso_time, sizeof ip->iso_time);
	162	ip->iso_flags = isonum_711 (isodir->flags);
	163	ip->iso_unit_size = isonum_711 (isodir->file_unit_size);
	164	ip->iso_interleave_gap = isonum_711 (isodir->interleave);
	165	ip->iso_volume_seq = isonum_723 (isodir->volume_sequence_number);
	166	ip->iso_namelen = isonum_711 (isodir->name_len);
	167
	168	/*
	169	* Initialize the associated vnode
	170	*/
	171	vp = ITOV(ip);
	172
	173	if (ip->iso_flags & 2)
	174	vp->v_type = VDIR;
	175	else
	176	vp->v_type = VREG;
	177
	178	imp = VFSTOISOFS (mntp);
	179
	180	if (ino == imp->root_extent)
	181	vp->v_flag \|= VROOT;
	182	/*
	183	* Finish inode initialization.
	184	*/
	185	ip->i_mnt = imp;
	186	ip->i_devvp = imp->im_devvp;
	187	VREF(ip->i_devvp);
	188	*ipp = ip;
	189	return (0);
	190	}
	191
	192	/*
	193	* Unlock and decrement the reference count of an inode structure.
	194	*/
	195	iso_iput(ip)
	196	register struct iso_node *ip;
	197	{
	198
	199	if ((ip->i_flag & ILOCKED) == 0)
	200	panic("iso_iput");
	201	ISO_IUNLOCK(ip);
	202	vrele(ITOV(ip));
	203	}
	204
	205	/*
	206	* Last reference to an inode, write the inode out and if necessary,
	207	* truncate and deallocate the file.
	208	*/
209	isofs_inactive(vp, p)
210	struct vnode *vp;
211	struct proc *p;
212	{
213	register struct iso_node *ip = VTOI(vp);
214	int mode, error = 0;
215
216	if (prtactive && vp->v_usecount != 0)
217	vprint("isofs_inactive: pushing active", vp);
218
219	ip->i_flag = 0;
220	/*
221	* If we are done with the inode, reclaim it
222	* so that it can be reused immediately.
223	*/
224	if (vp->v_usecount == 0 /* && ip->i_mode == 0 */)
225	vgone(vp);
226	return (error);
227	}
228
229	/*
230	* Reclaim an inode so that it can be used for other purposes.
231	*/
232	isofs_reclaim(vp)
233	register struct vnode *vp;
234	{
235	register struct iso_node *ip = VTOI(vp);
236	int i;
237
238	if (prtactive && vp->v_usecount != 0)
239	vprint("isofs_reclaim: pushing active", vp);
240	/*
241	* Remove the inode from its hash chain.
242	*/
243	remque(ip);
244	ip->i_forw = ip;
245	ip->i_back = ip;
246	/*
247	* Purge old data structures associated with the inode.
248	*/
249	cache_purge(vp);
250	if (ip->i_devvp) {
251	vrele(ip->i_devvp);
252	ip->i_devvp = 0;
253	}
254	ip->i_flag = 0;
255	return (0);
256	}
257
258	/*
259	* Lock an inode. If its already locked, set the WANT bit and sleep.
260	*/
261	iso_ilock(ip)
262	register struct iso_node *ip;
263	{
264
265	while (ip->i_flag & ILOCKED) {
266	ip->i_flag \|= IWANT;
267	if (ip->i_spare0 == curproc->p_pid)
268	panic("locking against myself");
269	ip->i_spare1 = curproc->p_pid;
270	(void) sleep((caddr_t)ip, PINOD);
271	}
272	ip->i_spare1 = 0;
273	ip->i_spare0 = curproc->p_pid;
274	ip->i_flag \|= ILOCKED;
275	}
276
277	/*
278	* Unlock an inode. If WANT bit is on, wakeup.
279	*/
280	iso_iunlock(ip)
281	register struct iso_node *ip;
282	{
283
284	if ((ip->i_flag & ILOCKED) == 0)
285	vprint("iso_iunlock: unlocked inode", ITOV(ip));
286	ip->i_spare0 = 0;
287	ip->i_flag &= ~ILOCKED;
288	if (ip->i_flag&IWANT) {
289	ip->i_flag &= ~IWANT;
290	wakeup((caddr_t)ip);
291	}
292	}