1 /* $OpenBSD: nfs_node.c,v 1.28 2004/12/26 21:22:13 miod Exp $ */
2 /* $NetBSD: nfs_node.c,v 1.16 1996/02/18 11:53:42 fvdl Exp $ */
3
4 /*
5 * Copyright (c) 1989, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Rick Macklem at The University of Guelph.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * @(#)nfs_node.c 8.6 (Berkeley) 5/22/95
36 */
37
38
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/proc.h>
42 #include <sys/mount.h>
43 #include <sys/namei.h>
44 #include <sys/vnode.h>
45 #include <sys/kernel.h>
46 #include <sys/malloc.h>
47 #include <sys/pool.h>
48 #include <sys/hash.h>
49
50 #include <nfs/rpcv2.h>
51 #include <nfs/nfsproto.h>
52 #include <nfs/nfs.h>
53 #include <nfs/nfsnode.h>
54 #include <nfs/nfsmount.h>
55 #include <nfs/nfs_var.h>
56
57 LIST_HEAD(nfsnodehashhead, nfsnode) *nfsnodehashtbl;
58 u_long nfsnodehash;
59 struct lock nfs_hashlock;
60
61 struct pool nfs_node_pool;
62
63 extern int prtactive;
64
65 #define TRUE 1
66 #define FALSE 0
67
68 #define nfs_hash(x,y) hash32_buf((x), (y), HASHINIT)
69
70 /*
71 * Initialize hash links for nfsnodes
72 * and build nfsnode free list.
73 */
74 void
nfs_nhinit()75 nfs_nhinit()
76 {
77 nfsnodehashtbl = hashinit(desiredvnodes, M_NFSNODE, M_WAITOK, &nfsnodehash);
78 lockinit(&nfs_hashlock, PINOD, "nfs_hashlock", 0, 0);
79
80 pool_init(&nfs_node_pool, sizeof(struct nfsnode), 0, 0, 0, "nfsnodepl",
81 &pool_allocator_nointr);
82 }
83
84 /*
85 * Look up a vnode/nfsnode by file handle.
86 * Callers must check for mount points!!
87 * In all cases, a pointer to a
88 * nfsnode structure is returned.
89 */
90 int
nfs_nget(mntp,fhp,fhsize,npp)91 nfs_nget(mntp, fhp, fhsize, npp)
92 struct mount *mntp;
93 nfsfh_t *fhp;
94 int fhsize;
95 struct nfsnode **npp;
96 {
97 struct proc *p = curproc; /* XXX */
98 struct nfsnode *np;
99 struct nfsnodehashhead *nhpp;
100 struct vnode *vp;
101 extern int (**nfsv2_vnodeop_p)(void *);
102 struct vnode *nvp;
103 int error;
104
105 nhpp = NFSNOHASH(nfs_hash(fhp, fhsize));
106 loop:
107 for (np = LIST_FIRST(nhpp); np != NULL; np = LIST_NEXT(np, n_hash)) {
108 if (mntp != NFSTOV(np)->v_mount || np->n_fhsize != fhsize ||
109 bcmp((caddr_t)fhp, (caddr_t)np->n_fhp, fhsize))
110 continue;
111 vp = NFSTOV(np);
112 if (vget(vp, LK_EXCLUSIVE, p))
113 goto loop;
114 *npp = np;
115 return(0);
116 }
117 if (lockmgr(&nfs_hashlock, LK_EXCLUSIVE|LK_SLEEPFAIL, NULL, p))
118 goto loop;
119 error = getnewvnode(VT_NFS, mntp, nfsv2_vnodeop_p, &nvp);
120 if (error) {
121 *npp = 0;
122 lockmgr(&nfs_hashlock, LK_RELEASE, NULL, p);
123 return (error);
124 }
125 vp = nvp;
126 np = pool_get(&nfs_node_pool, PR_WAITOK);
127 bzero((caddr_t)np, sizeof *np);
128 vp->v_data = np;
129 np->n_vnode = vp;
130
131 rw_init(&np->n_commitlock);
132
133 /*
134 * Are we getting the root? If so, make sure the vnode flags
135 * are correct
136 */
137 {
138 struct nfsmount *nmp = VFSTONFS(mntp);
139 if ((fhsize == nmp->nm_fhsize) &&
140 !bcmp(fhp, nmp->nm_fh, fhsize)) {
141 if (vp->v_type == VNON)
142 vp->v_type = VDIR;
143 vp->v_flag |= VROOT;
144 }
145 }
146
147 LIST_INSERT_HEAD(nhpp, np, n_hash);
148 if (fhsize > NFS_SMALLFH) {
149 np->n_fhp = malloc(fhsize, M_NFSBIGFH, M_WAITOK);
150 } else
151 np->n_fhp = &np->n_fh;
152 bcopy((caddr_t)fhp, (caddr_t)np->n_fhp, fhsize);
153 np->n_fhsize = fhsize;
154 lockmgr(&nfs_hashlock, LK_RELEASE, 0, p);
155 *npp = np;
156 return (0);
157 }
158
159 int
nfs_inactive(v)160 nfs_inactive(v)
161 void *v;
162 {
163 struct vop_inactive_args /* {
164 struct vnode *a_vp;
165 struct proc *a_p;
166 } */ *ap = v;
167 struct nfsnode *np;
168 struct sillyrename *sp;
169 struct proc *p = curproc; /* XXX */
170
171 np = VTONFS(ap->a_vp);
172 if (prtactive && ap->a_vp->v_usecount != 0)
173 vprint("nfs_inactive: pushing active", ap->a_vp);
174 if (ap->a_vp->v_type != VDIR) {
175 sp = np->n_sillyrename;
176 np->n_sillyrename = (struct sillyrename *)0;
177 } else
178 sp = (struct sillyrename *)0;
179 if (sp) {
180 /*
181 * Remove the silly file that was rename'd earlier
182 */
183 (void) nfs_vinvalbuf(ap->a_vp, 0, sp->s_cred, p, 1);
184 nfs_removeit(sp);
185 crfree(sp->s_cred);
186 vrele(sp->s_dvp);
187 FREE((caddr_t)sp, M_NFSREQ);
188 }
189 np->n_flag &= (NMODIFIED | NFLUSHINPROG | NFLUSHWANT);
190
191 VOP_UNLOCK(ap->a_vp, 0, ap->a_p);
192 return (0);
193 }
194
195 /*
196 * Reclaim an nfsnode so that it can be used for other purposes.
197 */
198 int
nfs_reclaim(v)199 nfs_reclaim(v)
200 void *v;
201 {
202 struct vop_reclaim_args /* {
203 struct vnode *a_vp;
204 } */ *ap = v;
205 struct vnode *vp = ap->a_vp;
206 struct nfsnode *np = VTONFS(vp);
207 struct nfsdmap *dp, *dp2;
208
209 if (prtactive && vp->v_usecount != 0)
210 vprint("nfs_reclaim: pushing active", vp);
211
212 if (np->n_hash.le_prev != NULL)
213 LIST_REMOVE(np, n_hash);
214
215 /*
216 * Free up any directory cookie structures and
217 * large file handle structures that might be associated with
218 * this nfs node.
219 */
220 if (vp->v_type == VDIR) {
221 dp = LIST_FIRST(&np->n_cookies);
222 while (dp) {
223 dp2 = dp;
224 dp = LIST_NEXT(dp, ndm_list);
225 FREE((caddr_t)dp2, M_NFSDIROFF);
226 }
227 }
228 if (np->n_fhsize > NFS_SMALLFH) {
229 free(np->n_fhp, M_NFSBIGFH);
230 }
231
232 if (np->n_rcred)
233 crfree(np->n_rcred);
234 if (np->n_wcred)
235 crfree(np->n_wcred);
236 cache_purge(vp);
237 pool_put(&nfs_node_pool, vp->v_data);
238 vp->v_data = NULL;
239 return (0);
240 }
241
242