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. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * @(#)nfs_node.c 8.6 (Berkeley) 5/22/95
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/fnv_hash.h>
46 #include <sys/malloc.h>
47 #include <sys/mount.h>
48 #include <sys/namei.h>
50 #include <sys/socket.h>
51 #include <sys/sysctl.h>
52 #include <sys/vnode.h>
54 #include <vm/vm_zone.h>
56 #include <nfs/rpcv2.h>
57 #include <nfs/nfsproto.h>
58 #include <nfsclient/nfs.h>
59 #include <nfsclient/nfsnode.h>
60 #include <nfsclient/nfsmount.h>
62 static vm_zone_t nfsnode_zone;
63 static LIST_HEAD(nfsnodehashhead, nfsnode) *nfsnodehashtbl;
64 static u_long nfsnodehash;
65 static int nfs_node_hash_lock;
70 SYSCTL_DECL(_debug_hashstat);
73 * Grab an atomic snapshot of the nfsnode hash chain lengths
76 sysctl_debug_hashstat_rawnfsnode(SYSCTL_HANDLER_ARGS)
79 struct nfsnodehashhead *nnpp;
84 n_nfsnode = nfsnodehash + 1; /* nfsnodehash = max index, not count */
86 return SYSCTL_OUT(req, 0, n_nfsnode * sizeof(int));
88 /* Scan hash tables for applicable entries */
89 for (nnpp = nfsnodehashtbl; n_nfsnode > 0; n_nfsnode--, nnpp++) {
91 LIST_FOREACH(nnp, nnpp, n_hash) {
94 error = SYSCTL_OUT(req, (caddr_t)&count, sizeof(count));
100 SYSCTL_PROC(_debug_hashstat, OID_AUTO, rawnfsnode, CTLTYPE_INT|CTLFLAG_RD, 0, 0,
101 sysctl_debug_hashstat_rawnfsnode, "S,int", "nfsnode chain lengths");
104 sysctl_debug_hashstat_nfsnode(SYSCTL_HANDLER_ARGS)
107 struct nfsnodehashhead *nnpp;
110 int count, maxlength, used, pct;
113 return SYSCTL_OUT(req, 0, 4 * sizeof(int));
115 n_nfsnode = nfsnodehash + 1; /* nfsnodehash = max index, not count */
119 /* Scan hash tables for applicable entries */
120 for (nnpp = nfsnodehashtbl; n_nfsnode > 0; n_nfsnode--, nnpp++) {
122 LIST_FOREACH(nnp, nnpp, n_hash) {
127 if (maxlength < count)
130 n_nfsnode = nfsnodehash + 1;
131 pct = (used * 100 * 100) / n_nfsnode;
132 error = SYSCTL_OUT(req, (caddr_t)&n_nfsnode, sizeof(n_nfsnode));
135 error = SYSCTL_OUT(req, (caddr_t)&used, sizeof(used));
138 error = SYSCTL_OUT(req, (caddr_t)&maxlength, sizeof(maxlength));
141 error = SYSCTL_OUT(req, (caddr_t)&pct, sizeof(pct));
146 SYSCTL_PROC(_debug_hashstat, OID_AUTO, nfsnode, CTLTYPE_INT|CTLFLAG_RD,
147 0, 0, sysctl_debug_hashstat_nfsnode, "I", "nfsnode chain lengths");
150 * Initialize hash links for nfsnodes
151 * and build nfsnode free list.
157 nfsnode_zone = zinit("NFSNODE", sizeof(struct nfsnode), 0, 0, 1);
158 nfsnodehashtbl = hashinit(desiredvnodes, M_NFSHASH, &nfsnodehash);
162 * Look up a vnode/nfsnode by file handle.
163 * Callers must check for mount points!!
164 * In all cases, a pointer to a
165 * nfsnode structure is returned.
168 nfs_nget(struct mount *mntp, nfsfh_t *fhp, int fhsize, struct nfsnode **npp)
170 struct thread *td = curthread; /* XXX */
171 struct nfsnode *np, *np2;
172 struct nfsnodehashhead *nhpp;
177 struct nfsmount *nmp;
180 * Calculate nfs mount point and figure out whether the rslock should
181 * be interruptable or not.
183 nmp = VFSTONFS(mntp);
184 if (nmp->nm_flag & NFSMNT_INT)
190 nhpp = NFSNOHASH(fnv_32_buf(fhp->fh_bytes, fhsize, FNV1_32_INIT));
192 LIST_FOREACH(np, nhpp, n_hash) {
193 if (mntp != NFSTOV(np)->v_mount || np->n_fhsize != fhsize ||
194 bcmp((caddr_t)fhp, (caddr_t)np->n_fhp, fhsize))
198 * np or vp may become invalid if vget() blocks, so loop
200 if (vget(vp, LK_EXCLUSIVE|LK_SLEEPFAIL, td))
206 * Obtain a lock to prevent a race condition if the getnewvnode()
207 * or MALLOC() below happens to block.
209 if (nfs_node_hash_lock) {
210 while (nfs_node_hash_lock) {
211 nfs_node_hash_lock = -1;
212 tsleep(&nfs_node_hash_lock, PVM, "nfsngt", 0);
216 nfs_node_hash_lock = 1;
219 * Allocate before getnewvnode since doing so afterward
220 * might cause a bogus v_data pointer to get dereferenced
221 * elsewhere if zalloc should block.
223 np = zalloc(nfsnode_zone);
225 error = getnewvnode(VT_NFS, mntp, nfsv2_vnodeop_p, &nvp);
227 if (nfs_node_hash_lock < 0)
228 wakeup(&nfs_node_hash_lock);
229 nfs_node_hash_lock = 0;
231 zfree(nfsnode_zone, np);
235 bzero((caddr_t)np, sizeof *np);
239 * Insert the nfsnode in the hash queue for its new file handle
241 LIST_FOREACH(np2, nhpp, n_hash) {
242 if (mntp != NFSTOV(np2)->v_mount || np2->n_fhsize != fhsize ||
243 bcmp((caddr_t)fhp, (caddr_t)np2->n_fhp, fhsize))
246 if (nfs_node_hash_lock < 0)
247 wakeup(&nfs_node_hash_lock);
248 nfs_node_hash_lock = 0;
249 zfree(nfsnode_zone, np);
252 LIST_INSERT_HEAD(nhpp, np, n_hash);
253 if (fhsize > NFS_SMALLFH) {
254 MALLOC(np->n_fhp, nfsfh_t *, fhsize, M_NFSBIGFH, M_WAITOK);
256 np->n_fhp = &np->n_fh;
257 bcopy((caddr_t)fhp, (caddr_t)np->n_fhp, fhsize);
258 np->n_fhsize = fhsize;
259 lockinit(&np->n_rslock, PVFS | rsflags, "nfrslk", 0, LK_NOPAUSE);
260 lockinit(&vp->v_lock, PVFS, "nfsnlk", 0, LK_NOPAUSE);
263 if (nfs_node_hash_lock < 0)
264 wakeup(&nfs_node_hash_lock);
265 nfs_node_hash_lock = 0;
268 * Lock the new nfsnode.
270 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
276 nfs_inactive(struct vop_inactive_args *ap)
279 struct sillyrename *sp;
280 struct thread *td = curthread; /* XXX */
282 np = VTONFS(ap->a_vp);
283 if (prtactive && ap->a_vp->v_usecount != 0)
284 vprint("nfs_inactive: pushing active", ap->a_vp);
285 if (ap->a_vp->v_type != VDIR) {
286 sp = np->n_sillyrename;
287 np->n_sillyrename = (struct sillyrename *)0;
289 sp = (struct sillyrename *)0;
292 * We need a reference to keep the vnode from being
293 * recycled by getnewvnode while we do the I/O
294 * associated with discarding the buffers unless we
295 * are being forcibly unmounted in which case we already
296 * have our own reference.
298 if (ap->a_vp->v_usecount > 0)
299 (void) nfs_vinvalbuf(ap->a_vp, 0, sp->s_cred, td, 1);
300 else if (vget(ap->a_vp, 0, td))
301 panic("nfs_inactive: lost vnode");
303 (void) nfs_vinvalbuf(ap->a_vp, 0, sp->s_cred, td, 1);
307 * Remove the silly file that was rename'd earlier
312 FREE((caddr_t)sp, M_NFSREQ);
314 np->n_flag &= (NMODIFIED | NFLUSHINPROG | NFLUSHWANT);
315 VOP_UNLOCK(ap->a_vp, 0, ap->a_td);
320 * Reclaim an nfsnode so that it can be used for other purposes.
323 nfs_reclaim(struct vop_reclaim_args *ap)
325 struct vnode *vp = ap->a_vp;
326 struct nfsnode *np = VTONFS(vp);
327 struct nfsdmap *dp, *dp2;
329 if (prtactive && vp->v_usecount != 0)
330 vprint("nfs_reclaim: pushing active", vp);
332 if (np->n_hash.le_prev != NULL) /* XXX beware */
333 LIST_REMOVE(np, n_hash);
336 * Free up any directory cookie structures and
337 * large file handle structures that might be associated with
340 if (vp->v_type == VDIR) {
341 dp = LIST_FIRST(&np->n_cookies);
344 dp = LIST_NEXT(dp, ndm_list);
345 FREE((caddr_t)dp2, M_NFSDIROFF);
348 if (np->n_fhsize > NFS_SMALLFH) {
349 FREE((caddr_t)np->n_fhp, M_NFSBIGFH);
352 lockdestroy(&np->n_rslock);
355 zfree(nfsnode_zone, vp->v_data);
356 vp->v_data = (void *)0;
365 nfs_lock(struct vop_lock_args *ap)
367 struct vnode *vp = ap->a_vp;
370 * Ugh, another place where interruptible mounts will get hung.
371 * If you make this sleep interruptible, then you have to fix all
372 * the VOP_LOCK() calls to expect interruptibility.
374 while (vp->v_flag & VXLOCK) {
375 vp->v_flag |= VXWANT;
376 (void) tsleep((caddr_t)vp, PINOD, "nfslck", 0);
378 if (vp->v_tag == VT_NON)
383 * Only lock regular files. If a server crashed while we were
384 * holding a directory lock, we could easily end up sleeping
385 * until the server rebooted while holding a lock on the root.
386 * Locks are only needed for protecting critical sections in
387 * VMIO at the moment.
388 * New vnodes will have type VNON but they should be locked
389 * since they may become VREG. This is checked in loadattrcache
390 * and unwanted locks are released there.
392 if (vp->v_type == VREG || vp->v_type == VNON) {
393 while (np->n_flag & NLOCKED) {
394 np->n_flag |= NWANTED;
395 (void) tsleep((caddr_t) np, PINOD, "nfslck2", 0);
397 * If the vnode has transmuted into a VDIR while we
398 * were asleep, then skip the lock.
400 if (vp->v_type != VREG && vp->v_type != VNON)
403 np->n_flag |= NLOCKED;
414 nfs_unlock(struct vop_unlock_args *ap)
417 struct vnode* vp = ap->a_vp;
418 struct nfsnode* np = VTONFS(vp);
420 if (vp->v_type == VREG || vp->v_type == VNON) {
421 if (!(np->n_flag & NLOCKED))
422 panic("nfs_unlock: nfsnode not locked");
423 np->n_flag &= ~NLOCKED;
424 if (np->n_flag & NWANTED) {
425 np->n_flag &= ~NWANTED;
426 wakeup((caddr_t) np);
435 * Check for a locked nfsnode
438 nfs_islocked(struct vop_islocked_args *ap)
441 return VTONFS(ap->a_vp)->n_flag & NLOCKED ? 1 : 0;