2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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 * 3. 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.
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
32 * @(#)nfs_node.c 8.6 (Berkeley) 5/22/95
33 * $FreeBSD: src/sys/nfs/nfs_node.c,v 1.36.2.3 2002/01/05 22:25:04 dillon Exp $
37 #include <sys/param.h>
38 #include <sys/systm.h>
40 #include <sys/mount.h>
41 #include <sys/namei.h>
42 #include <sys/vnode.h>
43 #include <sys/malloc.h>
44 #include <sys/kernel.h>
45 #include <sys/fnv_hash.h>
46 #include <sys/objcache.h>
54 static MALLOC_DEFINE(M_NFSNODE, "NFS node", "NFS node");
56 static struct objcache *nfsnode_objcache;
57 static LIST_HEAD(nfsnodehashhead, nfsnode) *nfsnodehashtbl;
58 static u_long nfsnodehash;
59 static lwkt_token nfsnhash_token = LWKT_TOKEN_INITIALIZER(nfsnhash_token);
60 static struct lock nfsnhash_lock;
65 #define NFSNOHASH(fhsum) (&nfsnodehashtbl[(fhsum) & nfsnodehash])
68 * Initialize hash links for nfsnodes
69 * and build nfsnode free list.
74 int hsize = vfs_inodehashsize();
76 nfsnode_objcache = objcache_create_simple(M_NFSNODE,
77 sizeof(struct nfsnode));
78 nfsnodehashtbl = hashinit(hsize, M_NFSHASH, &nfsnodehash);
79 lockinit(&nfsnhash_lock, "nfsnht", 0, 0);
83 * Look up a vnode/nfsnode by file handle.
84 * Callers must check for mount points!!
85 * In all cases, a pointer to a
86 * nfsnode structure is returned.
90 nfs_nget(struct mount *mntp, nfsfh_t *fhp, int fhsize, struct nfsnode **npp,
93 struct nfsnode *np, *np2;
94 struct nfsnodehashhead *nhpp;
101 * Calculate nfs mount point and figure out whether the rslock should
102 * be interruptable or not.
104 nmp = VFSTONFS(mntp);
105 if (nmp->nm_flag & NFSMNT_INT)
110 lwkt_gettoken(&nfsnhash_token);
113 nhpp = NFSNOHASH(fnv_32_buf(fhp->fh_bytes, fhsize, FNV1_32_INIT));
115 LIST_FOREACH(np, nhpp, n_hash) {
116 if (mntp != NFSTOV(np)->v_mount || np->n_fhsize != fhsize ||
117 bcmp((caddr_t)fhp, (caddr_t)np->n_fhp, fhsize)) {
122 kprintf("nfs warning: client-client collision "
123 "during rename/link/softlink\n");
125 lwkt_reltoken(&nfsnhash_token);
128 if (vget(vp, LK_EXCLUSIVE))
130 LIST_FOREACH(np, nhpp, n_hash) {
131 if (mntp == NFSTOV(np)->v_mount &&
132 np->n_fhsize == fhsize &&
133 bcmp((caddr_t)fhp, (caddr_t)np->n_fhp, fhsize) == 0
138 if (np == NULL || NFSTOV(np) != vp) {
143 lwkt_reltoken(&nfsnhash_token);
148 * Obtain a lock to prevent a race condition if the getnewvnode()
149 * or MALLOC() below happens to block.
151 if (lockmgr(&nfsnhash_lock, LK_EXCLUSIVE | LK_SLEEPFAIL))
155 * Allocate before getnewvnode since doing so afterward
156 * might cause a bogus v_data pointer to get dereferenced
157 * elsewhere if objcache should block.
159 np = objcache_get(nfsnode_objcache, M_WAITOK);
161 error = getnewvnode(VT_NFS, mntp, &vp, 0, 0);
163 lockmgr(&nfsnhash_lock, LK_RELEASE);
165 objcache_put(nfsnode_objcache, np);
166 lwkt_reltoken(&nfsnhash_token);
171 * Initialize most of (np).
173 bzero(np, sizeof (*np));
174 if (fhsize > NFS_SMALLFH) {
175 np->n_fhp = kmalloc(fhsize, M_NFSBIGFH, M_WAITOK);
177 np->n_fhp = &np->n_fh;
179 bcopy((caddr_t)fhp, (caddr_t)np->n_fhp, fhsize);
180 np->n_fhsize = fhsize;
181 lockinit(&np->n_rslock, "nfrslk", 0, lkflags);
184 * Validate that we did not race another nfs_nget() due to blocking
187 for (np2 = nhpp->lh_first; np2 != NULL; np2 = np2->n_hash.le_next) {
188 if (mntp != NFSTOV(np2)->v_mount || np2->n_fhsize != fhsize ||
189 bcmp((caddr_t)fhp, (caddr_t)np2->n_fhp, fhsize)) {
193 lockmgr(&nfsnhash_lock, LK_RELEASE);
195 if (np->n_fhsize > NFS_SMALLFH)
196 kfree((caddr_t)np->n_fhp, M_NFSBIGFH);
198 objcache_put(nfsnode_objcache, np);
203 * Finish connecting up (np, vp) and insert the nfsnode in the
204 * hash for its new file handle.
206 * nvp is locked & refd so effectively so is np.
210 LIST_INSERT_HEAD(nhpp, np, n_hash);
212 lockmgr(&nfsnhash_lock, LK_RELEASE);
213 lwkt_reltoken(&nfsnhash_token);
219 * Nonblocking version of nfs_nget()
222 nfs_nget_nonblock(struct mount *mntp, nfsfh_t *fhp, int fhsize,
223 struct nfsnode **npp, struct vnode *notvp)
225 struct nfsnode *np, *np2;
226 struct nfsnodehashhead *nhpp;
230 struct nfsmount *nmp;
233 * Calculate nfs mount point and figure out whether the rslock should
234 * be interruptable or not.
236 nmp = VFSTONFS(mntp);
237 if (nmp->nm_flag & NFSMNT_INT)
244 lwkt_gettoken(&nfsnhash_token);
247 nhpp = NFSNOHASH(fnv_32_buf(fhp->fh_bytes, fhsize, FNV1_32_INIT));
249 LIST_FOREACH(np, nhpp, n_hash) {
250 if (mntp != NFSTOV(np)->v_mount || np->n_fhsize != fhsize ||
251 bcmp((caddr_t)fhp, (caddr_t)np->n_fhp, fhsize)) {
257 kprintf("nfs warning: client-client collision "
258 "during rename/link/softlink\n");
262 if (vget(vp, LK_EXCLUSIVE | LK_NOWAIT)) {
268 if (NFSTOV(np) != vp) {
273 lwkt_reltoken(&nfsnhash_token);
278 * Not found. If we raced and had acquired a vp we have to release
287 * Obtain a lock to prevent a race condition if the getnewvnode()
288 * or MALLOC() below happens to block.
290 if (lockmgr(&nfsnhash_lock, LK_EXCLUSIVE | LK_SLEEPFAIL))
294 * Entry not found, allocate a new entry.
296 * Allocate before getnewvnode since doing so afterward
297 * might cause a bogus v_data pointer to get dereferenced
298 * elsewhere if objcache should block.
300 np = objcache_get(nfsnode_objcache, M_WAITOK);
302 error = getnewvnode(VT_NFS, mntp, &vp, 0, 0);
304 lockmgr(&nfsnhash_lock, LK_RELEASE);
305 objcache_put(nfsnode_objcache, np);
306 lwkt_reltoken(&nfsnhash_token);
311 * Initialize most of (np).
313 bzero(np, sizeof (*np));
314 if (fhsize > NFS_SMALLFH) {
315 np->n_fhp = kmalloc(fhsize, M_NFSBIGFH, M_WAITOK);
317 np->n_fhp = &np->n_fh;
319 bcopy((caddr_t)fhp, (caddr_t)np->n_fhp, fhsize);
320 np->n_fhsize = fhsize;
321 lockinit(&np->n_rslock, "nfrslk", 0, lkflags);
324 * Validate that we did not race another nfs_nget() due to blocking
327 for (np2 = nhpp->lh_first; np2 != NULL; np2 = np2->n_hash.le_next) {
328 if (mntp != NFSTOV(np2)->v_mount || np2->n_fhsize != fhsize ||
329 bcmp((caddr_t)fhp, (caddr_t)np2->n_fhp, fhsize)) {
333 lockmgr(&nfsnhash_lock, LK_RELEASE);
335 if (np->n_fhsize > NFS_SMALLFH)
336 kfree((caddr_t)np->n_fhp, M_NFSBIGFH);
338 objcache_put(nfsnode_objcache, np);
341 * vp state is retained on retry/loop so we must NULL it
342 * out here or fireworks may ensue.
349 * Finish connecting up (np, vp) and insert the nfsnode in the
350 * hash for its new file handle.
352 * nvp is locked & refd so effectively so is np.
356 LIST_INSERT_HEAD(nhpp, np, n_hash);
359 * nvp is locked & refd so effectively so is np.
363 lockmgr(&nfsnhash_lock, LK_RELEASE);
365 lwkt_reltoken(&nfsnhash_token);
370 * nfs_inactive(struct vnode *a_vp)
372 * NOTE: the passed vnode is locked but not referenced. On return the
373 * vnode must be unlocked and not referenced.
376 nfs_inactive(struct vop_inactive_args *ap)
378 struct nfsmount *nmp = VFSTONFS(ap->a_vp->v_mount);
380 struct sillyrename *sp;
382 lwkt_gettoken(&nmp->nm_token);
384 np = VTONFS(ap->a_vp);
385 if (prtactive && VREFCNT(ap->a_vp) > 1)
386 vprint("nfs_inactive: pushing active", ap->a_vp);
387 if (ap->a_vp->v_type != VDIR) {
388 sp = np->n_sillyrename;
389 np->n_sillyrename = NULL;
395 * We need a reference to keep the vnode from being
396 * recycled by getnewvnode while we do the I/O
397 * associated with discarding the buffers. The vnode
400 nfs_vinvalbuf(ap->a_vp, 0, 1);
403 * Remove the silly file that was rename'd earlier
408 kfree((caddr_t)sp, M_NFSREQ);
411 np->n_flag &= ~(NWRITEERR | NACC | NUPD | NCHG | NLOCKED | NWANTED);
412 lwkt_reltoken(&nmp->nm_token);
418 * Reclaim an nfsnode so that it can be used for other purposes.
420 * There should be no direct references to the related nfs node
421 * since nobody is holding the vnode any more, other than hash
422 * lookups which are interlocked against nfsnhash_token and vget().
424 * nfs_reclaim(struct vnode *a_vp)
427 nfs_reclaim(struct vop_reclaim_args *ap)
429 struct vnode *vp = ap->a_vp;
430 struct nfsnode *np = VTONFS(vp);
431 struct nfsdmap *dp, *dp2;
432 /* struct nfsmount *nmp = VFSTONFS(vp->v_mount);*/
434 if (prtactive && VREFCNT(vp) > 1)
435 vprint("nfs_reclaim: pushing active", vp);
439 * Remove from hash table and remove the cross links.
441 * NOTE: Other NFS code may look up a np and vget() the
442 * related vnode, then will check np->n_vnode.
443 * We must clear np->n_vnode here to ensure that all
444 * possible races are dealt with.
446 lwkt_gettoken(&nfsnhash_token);
447 KKASSERT(np->n_vnode == vp);
448 if (np->n_hash.le_prev != NULL)
449 LIST_REMOVE(np, n_hash);
452 lwkt_reltoken(&nfsnhash_token);
455 * Free up any directory cookie structures and
456 * large file handle structures that might be associated with
459 if (vp->v_type == VDIR) {
460 dp = np->n_cookies.lh_first;
463 dp = dp->ndm_list.le_next;
464 kfree((caddr_t)dp2, M_NFSDIROFF);
467 if (np->n_fhsize > NFS_SMALLFH) {
468 kfree((caddr_t)np->n_fhp, M_NFSBIGFH);
471 crfree(np->n_rucred);
475 crfree(np->n_wucred);
478 objcache_put(nfsnode_objcache, np);