1 /*-
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * from nfs_node.c 8.6 (Berkeley) 5/22/95
33 */
34
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD: releng/10.4/sys/fs/nfsclient/nfs_clnode.c 321031 2017-07-15 19:24:54Z rmacklem $");
37
38 #include "opt_kdtrace.h"
39
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/fcntl.h>
43 #include <sys/lock.h>
44 #include <sys/malloc.h>
45 #include <sys/mount.h>
46 #include <sys/namei.h>
47 #include <sys/proc.h>
48 #include <sys/socket.h>
49 #include <sys/sysctl.h>
50 #include <sys/taskqueue.h>
51 #include <sys/vnode.h>
52
53 #include <vm/uma.h>
54
55 #include <fs/nfs/nfsport.h>
56 #include <fs/nfsclient/nfsnode.h>
57 #include <fs/nfsclient/nfsmount.h>
58 #include <fs/nfsclient/nfs.h>
59 #include <fs/nfsclient/nfs_kdtrace.h>
60
61 #include <nfs/nfs_lock.h>
62
63 extern struct vop_vector newnfs_vnodeops;
64 extern struct buf_ops buf_ops_newnfs;
65 MALLOC_DECLARE(M_NEWNFSREQ);
66
67 uma_zone_t newnfsnode_zone;
68
69 const char nfs_vnode_tag[] = "newnfs";
70
71 static void nfs_freesillyrename(void *arg, __unused int pending);
72
73 void
74 ncl_nhinit(void)
75 {
76
77 newnfsnode_zone = uma_zcreate("NCLNODE", sizeof(struct nfsnode), NULL,
78 NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
79 }
80
81 void
82 ncl_nhuninit(void)
83 {
84 uma_zdestroy(newnfsnode_zone);
85 }
86
87 /*
88 * ONLY USED FOR THE ROOT DIRECTORY. nfscl_nget() does the rest. If this
89 * function is going to be used to get Regular Files, code must be added
90 * to fill in the "struct nfsv4node".
91 * Look up a vnode/nfsnode by file handle.
92 * Callers must check for mount points!!
93 * In all cases, a pointer to a
94 * nfsnode structure is returned.
95 */
96 int
97 ncl_nget(struct mount *mntp, u_int8_t *fhp, int fhsize, struct nfsnode **npp,
98 int lkflags)
99 {
100 struct thread *td = curthread; /* XXX */
101 struct nfsnode *np;
102 struct vnode *vp;
103 struct vnode *nvp;
104 int error;
105 u_int hash;
106 struct nfsmount *nmp;
107 struct nfsfh *nfhp;
108
109 nmp = VFSTONFS(mntp);
110 *npp = NULL;
111
112 hash = fnv_32_buf(fhp, fhsize, FNV1_32_INIT);
113
114 MALLOC(nfhp, struct nfsfh *, sizeof (struct nfsfh) + fhsize,
115 M_NFSFH, M_WAITOK);
116 bcopy(fhp, &nfhp->nfh_fh[0], fhsize);
117 nfhp->nfh_len = fhsize;
118 error = vfs_hash_get(mntp, hash, lkflags,
119 td, &nvp, newnfs_vncmpf, nfhp);
120 FREE(nfhp, M_NFSFH);
121 if (error)
122 return (error);
123 if (nvp != NULL) {
124 *npp = VTONFS(nvp);
125 return (0);
126 }
127 np = uma_zalloc(newnfsnode_zone, M_WAITOK | M_ZERO);
128
129 error = getnewvnode(nfs_vnode_tag, mntp, &newnfs_vnodeops, &nvp);
130 if (error) {
131 uma_zfree(newnfsnode_zone, np);
132 return (error);
133 }
134 vp = nvp;
135 KASSERT(vp->v_bufobj.bo_bsize != 0, ("ncl_nget: bo_bsize == 0"));
136 vp->v_bufobj.bo_ops = &buf_ops_newnfs;
137 vp->v_data = np;
138 np->n_vnode = vp;
139 /*
140 * Initialize the mutex even if the vnode is going to be a loser.
141 * This simplifies the logic in reclaim, which can then unconditionally
142 * destroy the mutex (in the case of the loser, or if hash_insert
143 * happened to return an error no special casing is needed).
144 */
145 mtx_init(&np->n_mtx, "NEWNFSnode lock", NULL, MTX_DEF | MTX_DUPOK);
146 /*
147 * NFS supports recursive and shared locking.
148 */
149 lockmgr(vp->v_vnlock, LK_EXCLUSIVE | LK_NOWITNESS, NULL);
150 VN_LOCK_AREC(vp);
151 VN_LOCK_ASHARE(vp);
152 /*
153 * Are we getting the root? If so, make sure the vnode flags
154 * are correct
155 */
156 if ((fhsize == nmp->nm_fhsize) &&
157 !bcmp(fhp, nmp->nm_fh, fhsize)) {
158 if (vp->v_type == VNON)
159 vp->v_type = VDIR;
160 vp->v_vflag |= VV_ROOT;
161 }
162
163 MALLOC(np->n_fhp, struct nfsfh *, sizeof (struct nfsfh) + fhsize,
164 M_NFSFH, M_WAITOK);
165 bcopy(fhp, np->n_fhp->nfh_fh, fhsize);
166 np->n_fhp->nfh_len = fhsize;
167 error = insmntque(vp, mntp);
168 if (error != 0) {
169 *npp = NULL;
170 FREE((caddr_t)np->n_fhp, M_NFSFH);
171 mtx_destroy(&np->n_mtx);
172 uma_zfree(newnfsnode_zone, np);
173 return (error);
174 }
175 error = vfs_hash_insert(vp, hash, lkflags,
176 td, &nvp, newnfs_vncmpf, np->n_fhp);
177 if (error)
178 return (error);
179 if (nvp != NULL) {
180 *npp = VTONFS(nvp);
181 /* vfs_hash_insert() vput()'s the losing vnode */
182 return (0);
183 }
184 *npp = np;
185
186 return (0);
187 }
188
189 /*
190 * Do the vrele(sp->s_dvp) as a separate task in order to avoid a
191 * deadlock because of a LOR when vrele() locks the directory vnode.
192 */
193 static void
194 nfs_freesillyrename(void *arg, __unused int pending)
195 {
196 struct sillyrename *sp;
197
198 sp = arg;
199 vrele(sp->s_dvp);
200 free(sp, M_NEWNFSREQ);
201 }
202
203 static void
204 ncl_releasesillyrename(struct vnode *vp, struct thread *td)
205 {
206 struct nfsnode *np;
207 struct sillyrename *sp;
208
209 ASSERT_VOP_ELOCKED(vp, "releasesillyrename");
210 np = VTONFS(vp);
211 mtx_assert(&np->n_mtx, MA_OWNED);
212 if (vp->v_type != VDIR) {
213 sp = np->n_sillyrename;
214 np->n_sillyrename = NULL;
215 } else
216 sp = NULL;
217 if (sp != NULL) {
218 mtx_unlock(&np->n_mtx);
219 (void) ncl_vinvalbuf(vp, 0, td, 1);
220 /*
221 * Remove the silly file that was rename'd earlier
222 */
223 ncl_removeit(sp, vp);
224 crfree(sp->s_cred);
225 TASK_INIT(&sp->s_task, 0, nfs_freesillyrename, sp);
226 taskqueue_enqueue(taskqueue_thread, &sp->s_task);
227 mtx_lock(&np->n_mtx);
228 }
229 }
230
231 int
232 ncl_inactive(struct vop_inactive_args *ap)
233 {
234 struct vnode *vp = ap->a_vp;
235 struct nfsnode *np;
236 boolean_t retv;
237
238 if (NFS_ISV4(vp) && vp->v_type == VREG) {
239 /*
240 * Since mmap()'d files do I/O after VOP_CLOSE(), the NFSv4
241 * Close operations are delayed until now. Any dirty
242 * buffers/pages must be flushed before the close, so that the
243 * stateid is available for the writes.
244 */
245 if (vp->v_object != NULL) {
246 VM_OBJECT_WLOCK(vp->v_object);
247 retv = vm_object_page_clean(vp->v_object, 0, 0,
248 OBJPC_SYNC);
249 VM_OBJECT_WUNLOCK(vp->v_object);
250 } else
251 retv = TRUE;
252 if (retv == TRUE) {
253 (void)ncl_flush(vp, MNT_WAIT, ap->a_td, 1, 0);
254 (void)nfsrpc_close(vp, 1, ap->a_td);
255 }
256 }
257
258 np = VTONFS(vp);
259 mtx_lock(&np->n_mtx);
260 ncl_releasesillyrename(vp, ap->a_td);
261
262 /*
263 * NMODIFIED means that there might be dirty/stale buffers
264 * associated with the NFS vnode.
265 * NDSCOMMIT means that the file is on a pNFS server and commits
266 * should be done to the DS.
267 * None of the other flags are meaningful after the vnode is unused.
268 */
269 np->n_flag &= (NMODIFIED | NDSCOMMIT);
270 mtx_unlock(&np->n_mtx);
271 return (0);
272 }
273
274 /*
275 * Reclaim an nfsnode so that it can be used for other purposes.
276 */
277 int
278 ncl_reclaim(struct vop_reclaim_args *ap)
279 {
280 struct vnode *vp = ap->a_vp;
281 struct nfsnode *np = VTONFS(vp);
282 struct nfsdmap *dp, *dp2;
283
284 /*
285 * If the NLM is running, give it a chance to abort pending
286 * locks.
287 */
288 if (nfs_reclaim_p != NULL)
289 nfs_reclaim_p(ap);
290
291 mtx_lock(&np->n_mtx);
292 ncl_releasesillyrename(vp, ap->a_td);
293 mtx_unlock(&np->n_mtx);
294
295 /*
296 * Destroy the vm object and flush associated pages.
297 */
298 vnode_destroy_vobject(vp);
299
300 if (NFS_ISV4(vp) && vp->v_type == VREG)
301 /*
302 * We can now safely close any remaining NFSv4 Opens for
303 * this file. Most opens will have already been closed by
304 * ncl_inactive(), but there are cases where it is not
305 * called, so we need to do it again here.
306 */
307 (void) nfsrpc_close(vp, 1, ap->a_td);
308
309 vfs_hash_remove(vp);
310
311 /*
312 * Call nfscl_reclaimnode() to save attributes in the delegation,
313 * as required.
314 */
315 if (vp->v_type == VREG)
316 nfscl_reclaimnode(vp);
317
318 /*
319 * Free up any directory cookie structures and
320 * large file handle structures that might be associated with
321 * this nfs node.
322 */
323 if (vp->v_type == VDIR) {
324 dp = LIST_FIRST(&np->n_cookies);
325 while (dp) {
326 dp2 = dp;
327 dp = LIST_NEXT(dp, ndm_list);
328 FREE((caddr_t)dp2, M_NFSDIROFF);
329 }
330 }
331 if (np->n_writecred != NULL)
332 crfree(np->n_writecred);
333 FREE((caddr_t)np->n_fhp, M_NFSFH);
334 if (np->n_v4 != NULL)
335 FREE((caddr_t)np->n_v4, M_NFSV4NODE);
336 mtx_destroy(&np->n_mtx);
337 uma_zfree(newnfsnode_zone, vp->v_data);
338 vp->v_data = NULL;
339 return (0);
340 }
341
342 /*
343 * Invalidate both the access and attribute caches for this vnode.
344 */
345 void
346 ncl_invalcaches(struct vnode *vp)
347 {
348 struct nfsnode *np = VTONFS(vp);
349 int i;
350
351 mtx_lock(&np->n_mtx);
352 for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
353 np->n_accesscache[i].stamp = 0;
354 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
355 np->n_attrstamp = 0;
356 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
357 mtx_unlock(&np->n_mtx);
358 }
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