[unix-history] / 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
 */

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