summaryrefslogtreecommitdiffstats
path: root/sys/nfs/nfs_node.c
blob: 2054fdf3cb1709cce272b508073b0e4e2d096727 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
/*
 * Copyright (c) 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rick Macklem at The University of Guelph.
 *
 * 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.
 *
 *	@(#)nfs_node.c	8.2 (Berkeley) 12/30/93
 * $Id$
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/kernel.h>
#include <sys/malloc.h>

#include <nfs/rpcv2.h>
#include <nfs/nfsv2.h>
#include <nfs/nfs.h>
#include <nfs/nfsnode.h>
#include <nfs/nfsmount.h>
#include <nfs/nqnfs.h>

struct nfsnode **nheadhashtbl;
u_long nheadhash;
#define	NFSNOHASH(fhsum)	((fhsum)&nheadhash)

#define TRUE	1
#define	FALSE	0

/*
 * Initialize hash links for nfsnodes
 * and build nfsnode free list.
 */
void
nfs_nhinit()
{

#ifndef lint
	if ((sizeof(struct nfsnode) - 1) & sizeof(struct nfsnode))
		printf("nfs_nhinit: bad size %d\n", sizeof(struct nfsnode));
#endif /* not lint */
	nheadhashtbl = hashinit(desiredvnodes, M_NFSNODE, &nheadhash);
}

/*
 * Compute an entry in the NFS hash table structure
 */
struct nfsnode **
nfs_hash(fhp)
	register nfsv2fh_t *fhp;
{
	register u_char *fhpp;
	register u_long fhsum;
	int i;

	fhpp = &fhp->fh_bytes[0];
	fhsum = 0;
	for (i = 0; i < NFSX_FH; i++)
		fhsum += *fhpp++;
	return (&nheadhashtbl[NFSNOHASH(fhsum)]);
}

/*
 * Look up a vnode/nfsnode by file handle.
 * Callers must check for mount points!!
 * In all cases, a pointer to a
 * nfsnode structure is returned.
 */
int
nfs_nget(mntp, fhp, npp)
	struct mount *mntp;
	register nfsv2fh_t *fhp;
	struct nfsnode **npp;
{
	register struct nfsnode *np, *nq, **nhpp;
	register struct vnode *vp;
	extern int (**nfsv2_vnodeop_p)();
	struct vnode *nvp;
	int error;

	nhpp = nfs_hash(fhp);
loop:
	for (np = *nhpp; np; np = np->n_forw) {
		if (mntp != NFSTOV(np)->v_mount ||
		    bcmp((caddr_t)fhp, (caddr_t)&np->n_fh, NFSX_FH))
			continue;
		vp = NFSTOV(np);
		if (vget(vp, 1))
			goto loop;
		*npp = np;
		return(0);
	}
	if (error = getnewvnode(VT_NFS, mntp, nfsv2_vnodeop_p, &nvp)) {
		*npp = 0;
		return (error);
	}
	vp = nvp;
	MALLOC(np, struct nfsnode *, sizeof *np, M_NFSNODE, M_WAITOK);
	vp->v_data = np;
	np->n_vnode = vp;
	/*
	 * Insert the nfsnode in the hash queue for its new file handle
	 */
	np->n_flag = 0;
	if (nq = *nhpp)
		nq->n_back = &np->n_forw;
	np->n_forw = nq;
	np->n_back = nhpp;
	*nhpp = np;
	bcopy((caddr_t)fhp, (caddr_t)&np->n_fh, NFSX_FH);
	np->n_attrstamp = 0;
	np->n_direofoffset = 0;
	np->n_sillyrename = (struct sillyrename *)0;
	np->n_size = 0;
	np->n_mtime = 0;
	if (VFSTONFS(mntp)->nm_flag & NFSMNT_NQNFS) {
		np->n_brev = 0;
		np->n_lrev = 0;
		np->n_expiry = (time_t)0;
		np->n_tnext = (struct nfsnode *)0;
	}
	*npp = np;
	return (0);
}

int
nfs_inactive(ap)
	struct vop_inactive_args /* {
		struct vnode *a_vp;
	} */ *ap;
{
	register struct nfsnode *np;
	register struct sillyrename *sp;
	struct proc *p = curproc;	/* XXX */
	extern int prtactive;

	np = VTONFS(ap->a_vp);
	if (prtactive && ap->a_vp->v_usecount != 0)
		vprint("nfs_inactive: pushing active", ap->a_vp);
	sp = np->n_sillyrename;
	np->n_sillyrename = (struct sillyrename *)0;
	if (sp) {
		/*
		 * Remove the silly file that was rename'd earlier
		 */
		(void) nfs_vinvalbuf(ap->a_vp, 0, sp->s_cred, p, 1);
		nfs_removeit(sp);
		crfree(sp->s_cred);
		vrele(sp->s_dvp);
#ifdef SILLYSEPARATE
		free((caddr_t)sp, M_NFSREQ);
#endif
	}
	np->n_flag &= (NMODIFIED | NFLUSHINPROG | NFLUSHWANT | NQNFSEVICTED |
		NQNFSNONCACHE | NQNFSWRITE);
	return (0);
}

/*
 * Reclaim an nfsnode so that it can be used for other purposes.
 */
int
nfs_reclaim(ap)
	struct vop_reclaim_args /* {
		struct vnode *a_vp;
	} */ *ap;
{
	register struct vnode *vp = ap->a_vp;
	register struct nfsnode *np = VTONFS(vp);
	register struct nfsmount *nmp = VFSTONFS(vp->v_mount);
	register struct nfsnode *nq;
	extern int prtactive;

	if (prtactive && vp->v_usecount != 0)
		vprint("nfs_reclaim: pushing active", vp);
	/*
	 * Remove the nfsnode from its hash chain.
	 */
	if (nq = np->n_forw)
		nq->n_back = np->n_back;
	*np->n_back = nq;

	/*
	 * For nqnfs, take it off the timer queue as required.
	 */
	if ((nmp->nm_flag & NFSMNT_NQNFS) && np->n_tnext) {
		if (np->n_tnext == (struct nfsnode *)nmp)
			nmp->nm_tprev = np->n_tprev;
		else
			np->n_tnext->n_tprev = np->n_tprev;
		if (np->n_tprev == (struct nfsnode *)nmp)
			nmp->nm_tnext = np->n_tnext;
		else
			np->n_tprev->n_tnext = np->n_tnext;
	}
	cache_purge(vp);
	FREE(vp->v_data, M_NFSNODE);
	vp->v_data = (void *)0;
	return (0);
}

/*
 * Lock an nfsnode
 */
int
nfs_lock(ap)
	struct vop_lock_args /* {
		struct vnode *a_vp;
	} */ *ap;
{
	register struct vnode *vp = ap->a_vp;

	/*
	 * Ugh, another place where interruptible mounts will get hung.
	 * If you make this sleep interruptible, then you have to fix all
	 * the VOP_LOCK() calls to expect interruptibility.
	 */
	while (vp->v_flag & VXLOCK) {
		vp->v_flag |= VXWANT;
		sleep((caddr_t)vp, PINOD);
	}
	if (vp->v_tag == VT_NON)
		return (ENOENT);
	return (0);
}

/*
 * Unlock an nfsnode
 */
int
nfs_unlock(ap)
	struct vop_unlock_args /* {
		struct vnode *a_vp;
	} */ *ap;
{

	return (0);
}

/*
 * Check for a locked nfsnode
 */
int
nfs_islocked(ap)
	struct vop_islocked_args /* {
		struct vnode *a_vp;
	} */ *ap;
{

	return (0);
}

/*
 * Nfs abort op, called after namei() when a CREATE/DELETE isn't actually
 * done. Currently nothing to do.
 */
/* ARGSUSED */
int
nfs_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);
}
OpenPOWER on IntegriCloud