1 | /* $NetBSD: nfs_node.c,v 1.119 2016/08/20 12:37:09 hannken Exp $ */ |
2 | |
3 | /* |
4 | * Copyright (c) 1989, 1993 |
5 | * The Regents of the University of California. All rights reserved. |
6 | * |
7 | * This code is derived from software contributed to Berkeley by |
8 | * Rick Macklem at The University of Guelph. |
9 | * |
10 | * Redistribution and use in source and binary forms, with or without |
11 | * modification, are permitted provided that the following conditions |
12 | * are met: |
13 | * 1. Redistributions of source code must retain the above copyright |
14 | * notice, this list of conditions and the following disclaimer. |
15 | * 2. Redistributions in binary form must reproduce the above copyright |
16 | * notice, this list of conditions and the following disclaimer in the |
17 | * documentation and/or other materials provided with the distribution. |
18 | * 3. Neither the name of the University nor the names of its contributors |
19 | * may be used to endorse or promote products derived from this software |
20 | * without specific prior written permission. |
21 | * |
22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
32 | * SUCH DAMAGE. |
33 | * |
34 | * @(#)nfs_node.c 8.6 (Berkeley) 5/22/95 |
35 | */ |
36 | |
37 | #include <sys/cdefs.h> |
38 | __KERNEL_RCSID(0, "$NetBSD: nfs_node.c,v 1.119 2016/08/20 12:37:09 hannken Exp $" ); |
39 | |
40 | #ifdef _KERNEL_OPT |
41 | #include "opt_nfs.h" |
42 | #endif |
43 | |
44 | #include <sys/param.h> |
45 | #include <sys/systm.h> |
46 | #include <sys/proc.h> |
47 | #include <sys/mount.h> |
48 | #include <sys/namei.h> |
49 | #include <sys/vnode.h> |
50 | #include <sys/kernel.h> |
51 | #include <sys/pool.h> |
52 | #include <sys/lock.h> |
53 | #include <sys/hash.h> |
54 | #include <sys/kauth.h> |
55 | |
56 | #include <nfs/rpcv2.h> |
57 | #include <nfs/nfsproto.h> |
58 | #include <nfs/nfs.h> |
59 | #include <nfs/nfsnode.h> |
60 | #include <nfs/nfsmount.h> |
61 | #include <nfs/nfs_var.h> |
62 | |
63 | struct pool nfs_node_pool; |
64 | struct pool nfs_vattr_pool; |
65 | static struct workqueue *nfs_sillyworkq; |
66 | |
67 | extern int prtactive; |
68 | |
69 | static void nfs_gop_size(struct vnode *, off_t, off_t *, int); |
70 | static int nfs_gop_alloc(struct vnode *, off_t, off_t, int, kauth_cred_t); |
71 | static int nfs_gop_write(struct vnode *, struct vm_page **, int, int); |
72 | static void nfs_sillyworker(struct work *, void *); |
73 | |
74 | static const struct genfs_ops nfs_genfsops = { |
75 | .gop_size = nfs_gop_size, |
76 | .gop_alloc = nfs_gop_alloc, |
77 | .gop_write = nfs_gop_write, |
78 | }; |
79 | |
80 | /* |
81 | * Reinitialize inode hash table. |
82 | */ |
83 | void |
84 | nfs_node_init(void) |
85 | { |
86 | |
87 | pool_init(&nfs_node_pool, sizeof(struct nfsnode), 0, 0, 0, "nfsnodepl" , |
88 | &pool_allocator_nointr, IPL_NONE); |
89 | pool_init(&nfs_vattr_pool, sizeof(struct vattr), 0, 0, 0, "nfsvapl" , |
90 | &pool_allocator_nointr, IPL_NONE); |
91 | if (workqueue_create(&nfs_sillyworkq, "nfssilly" , nfs_sillyworker, |
92 | NULL, PRI_NONE, IPL_NONE, 0) != 0) { |
93 | panic("nfs_node_init" ); |
94 | } |
95 | } |
96 | |
97 | /* |
98 | * Free resources previously allocated in nfs_node_reinit(). |
99 | */ |
100 | void |
101 | nfs_node_done(void) |
102 | { |
103 | |
104 | pool_destroy(&nfs_node_pool); |
105 | pool_destroy(&nfs_vattr_pool); |
106 | workqueue_destroy(nfs_sillyworkq); |
107 | } |
108 | |
109 | /* |
110 | * Initialize this vnode / nfs node pair. |
111 | * Caller assures no other thread will try to load this node. |
112 | */ |
113 | int |
114 | nfs_loadvnode(struct mount *mp, struct vnode *vp, |
115 | const void *key, size_t key_len, const void **new_key) |
116 | { |
117 | int fhsize = key_len; |
118 | const nfsfh_t *fhp = key; |
119 | struct nfsnode *np; |
120 | |
121 | /* Aloocate and initialize the nfsnode. */ |
122 | np = pool_get(&nfs_node_pool, PR_WAITOK); |
123 | memset(np, 0, sizeof *np); |
124 | if (fhsize > NFS_SMALLFH) { |
125 | np->n_fhp = kmem_alloc(fhsize, KM_SLEEP); |
126 | } else |
127 | np->n_fhp = &np->n_fh; |
128 | vp->v_tag = VT_NFS; |
129 | vp->v_type = VNON; |
130 | vp->v_op = nfsv2_vnodeop_p; |
131 | vp->v_data = np; |
132 | memcpy(np->n_fhp, fhp, fhsize); |
133 | np->n_fhsize = fhsize; |
134 | np->n_accstamp = -1; |
135 | np->n_vattr = pool_get(&nfs_vattr_pool, PR_WAITOK); |
136 | np->n_vnode = vp; |
137 | |
138 | /* Initialize genfs node. */ |
139 | genfs_node_init(vp, &nfs_genfsops); |
140 | /* |
141 | * Initalize read/write creds to useful values. VOP_OPEN will |
142 | * overwrite these. |
143 | */ |
144 | np->n_rcred = curlwp->l_cred; |
145 | kauth_cred_hold(np->n_rcred); |
146 | np->n_wcred = curlwp->l_cred; |
147 | kauth_cred_hold(np->n_wcred); |
148 | NFS_INVALIDATE_ATTRCACHE(np); |
149 | uvm_vnp_setsize(vp, 0); |
150 | *new_key = np->n_fhp; |
151 | return 0; |
152 | } |
153 | |
154 | /* |
155 | * Look up a vnode/nfsnode by file handle. |
156 | * Callers must check for mount points!! |
157 | * In all cases, a pointer to a |
158 | * nfsnode structure is returned. |
159 | */ |
160 | int |
161 | nfs_nget1(struct mount *mntp, nfsfh_t *fhp, int fhsize, struct nfsnode **npp, |
162 | int lkflags) |
163 | { |
164 | int error; |
165 | struct vnode *vp; |
166 | |
167 | error = vcache_get(mntp, fhp, fhsize, &vp); |
168 | if (error) |
169 | return error; |
170 | error = vn_lock(vp, LK_EXCLUSIVE | lkflags); |
171 | if (error) { |
172 | vrele(vp); |
173 | return error; |
174 | } |
175 | *npp = VTONFS(vp); |
176 | return 0; |
177 | } |
178 | |
179 | int |
180 | nfs_inactive(void *v) |
181 | { |
182 | struct vop_inactive_args /* { |
183 | struct vnode *a_vp; |
184 | bool *a_recycle; |
185 | } */ *ap = v; |
186 | struct nfsnode *np; |
187 | struct sillyrename *sp; |
188 | struct vnode *vp = ap->a_vp; |
189 | |
190 | np = VTONFS(vp); |
191 | if (vp->v_type != VDIR) { |
192 | sp = np->n_sillyrename; |
193 | np->n_sillyrename = (struct sillyrename *)0; |
194 | } else |
195 | sp = NULL; |
196 | if (sp != NULL) |
197 | nfs_vinvalbuf(vp, 0, sp->s_cred, curlwp, 1); |
198 | *ap->a_recycle = (np->n_flag & NREMOVED) != 0; |
199 | np->n_flag &= |
200 | (NMODIFIED | NFLUSHINPROG | NFLUSHWANT | NEOFVALID | NTRUNCDELAYED); |
201 | |
202 | if (vp->v_type == VDIR && np->n_dircache) |
203 | nfs_invaldircache(vp, |
204 | NFS_INVALDIRCACHE_FORCE | NFS_INVALDIRCACHE_KEEPEOF); |
205 | |
206 | VOP_UNLOCK(vp); |
207 | |
208 | if (sp != NULL) { |
209 | workqueue_enqueue(nfs_sillyworkq, &sp->s_work, NULL); |
210 | } |
211 | |
212 | return (0); |
213 | } |
214 | |
215 | /* |
216 | * Reclaim an nfsnode so that it can be used for other purposes. |
217 | */ |
218 | int |
219 | nfs_reclaim(void *v) |
220 | { |
221 | struct vop_reclaim_args /* { |
222 | struct vnode *a_vp; |
223 | } */ *ap = v; |
224 | struct vnode *vp = ap->a_vp; |
225 | struct nfsnode *np = VTONFS(vp); |
226 | |
227 | if (prtactive && vp->v_usecount > 1) |
228 | vprint("nfs_reclaim: pushing active" , vp); |
229 | |
230 | /* |
231 | * Free up any directory cookie structures and |
232 | * large file handle structures that might be associated with |
233 | * this nfs node. |
234 | */ |
235 | if (vp->v_type == VDIR && np->n_dircache != NULL) { |
236 | nfs_invaldircache(vp, NFS_INVALDIRCACHE_FORCE); |
237 | hashdone(np->n_dircache, HASH_LIST, nfsdirhashmask); |
238 | } |
239 | KASSERT(np->n_dirgens == NULL); |
240 | |
241 | if (np->n_fhsize > NFS_SMALLFH) |
242 | kmem_free(np->n_fhp, np->n_fhsize); |
243 | |
244 | pool_put(&nfs_vattr_pool, np->n_vattr); |
245 | if (np->n_rcred) |
246 | kauth_cred_free(np->n_rcred); |
247 | |
248 | if (np->n_wcred) |
249 | kauth_cred_free(np->n_wcred); |
250 | |
251 | if (vp->v_type == VREG) { |
252 | mutex_destroy(&np->n_commitlock); |
253 | } |
254 | genfs_node_destroy(vp); |
255 | pool_put(&nfs_node_pool, np); |
256 | vp->v_data = NULL; |
257 | return (0); |
258 | } |
259 | |
260 | void |
261 | nfs_gop_size(struct vnode *vp, off_t size, off_t *eobp, int flags) |
262 | { |
263 | |
264 | *eobp = MAX(size, vp->v_size); |
265 | } |
266 | |
267 | int |
268 | nfs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags, |
269 | kauth_cred_t cred) |
270 | { |
271 | |
272 | return 0; |
273 | } |
274 | |
275 | int |
276 | nfs_gop_write(struct vnode *vp, struct vm_page **pgs, int npages, int flags) |
277 | { |
278 | int i; |
279 | |
280 | mutex_enter(vp->v_interlock); |
281 | for (i = 0; i < npages; i++) { |
282 | pmap_page_protect(pgs[i], VM_PROT_READ); |
283 | } |
284 | mutex_exit(vp->v_interlock); |
285 | |
286 | return genfs_gop_write(vp, pgs, npages, flags); |
287 | } |
288 | |
289 | /* |
290 | * Remove a silly file that was rename'd earlier |
291 | */ |
292 | static void |
293 | nfs_sillyworker(struct work *work, void *arg) |
294 | { |
295 | struct sillyrename *sp; |
296 | int error; |
297 | |
298 | sp = (struct sillyrename *)work; |
299 | error = vn_lock(sp->s_dvp, LK_EXCLUSIVE); |
300 | if (error || sp->s_dvp->v_data == NULL) { |
301 | /* XXX should recover */ |
302 | printf("%s: vp=%p error=%d\n" , __func__, sp->s_dvp, error); |
303 | if (error == 0) { |
304 | vput(sp->s_dvp); |
305 | } else { |
306 | vrele(sp->s_dvp); |
307 | } |
308 | } else { |
309 | nfs_removeit(sp); |
310 | vput(sp->s_dvp); |
311 | } |
312 | kauth_cred_free(sp->s_cred); |
313 | kmem_free(sp, sizeof(*sp)); |
314 | } |
315 | |