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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/nfsd/nfs4state.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/nfsd/nfs4state.c')
-rw-r--r--fs/nfsd/nfs4state.c3320
1 files changed, 3320 insertions, 0 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
new file mode 100644
index 000000000000..579f7fea7968
--- /dev/null
+++ b/fs/nfsd/nfs4state.c
@@ -0,0 +1,3320 @@
1/*
2* linux/fs/nfsd/nfs4state.c
3*
4* Copyright (c) 2001 The Regents of the University of Michigan.
5* All rights reserved.
6*
7* Kendrick Smith <kmsmith@umich.edu>
8* Andy Adamson <kandros@umich.edu>
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*
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
20* contributors may be used to endorse or promote products derived
21* from this software without specific prior written permission.
22*
23* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34*
35*/
36
37#include <linux/param.h>
38#include <linux/major.h>
39#include <linux/slab.h>
40
41#include <linux/sunrpc/svc.h>
42#include <linux/nfsd/nfsd.h>
43#include <linux/nfsd/cache.h>
44#include <linux/mount.h>
45#include <linux/workqueue.h>
46#include <linux/smp_lock.h>
47#include <linux/kthread.h>
48#include <linux/nfs4.h>
49#include <linux/nfsd/state.h>
50#include <linux/nfsd/xdr4.h>
51
52#define NFSDDBG_FACILITY NFSDDBG_PROC
53
54/* Globals */
55static time_t lease_time = 90; /* default lease time */
56static time_t old_lease_time = 90; /* past incarnation lease time */
57static u32 nfs4_reclaim_init = 0;
58time_t boot_time;
59static time_t grace_end = 0;
60static u32 current_clientid = 1;
61static u32 current_ownerid = 1;
62static u32 current_fileid = 1;
63static u32 current_delegid = 1;
64static u32 nfs4_init;
65stateid_t zerostateid; /* bits all 0 */
66stateid_t onestateid; /* bits all 1 */
67
68/* debug counters */
69u32 list_add_perfile = 0;
70u32 list_del_perfile = 0;
71u32 add_perclient = 0;
72u32 del_perclient = 0;
73u32 alloc_file = 0;
74u32 free_file = 0;
75u32 vfsopen = 0;
76u32 vfsclose = 0;
77u32 alloc_delegation= 0;
78u32 free_delegation= 0;
79
80/* forward declarations */
81struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
82static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
83static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
84
85/* Locking:
86 *
87 * client_sema:
88 * protects clientid_hashtbl[], clientstr_hashtbl[],
89 * unconfstr_hashtbl[], uncofid_hashtbl[].
90 */
91static DECLARE_MUTEX(client_sema);
92
93void
94nfs4_lock_state(void)
95{
96 down(&client_sema);
97}
98
99void
100nfs4_unlock_state(void)
101{
102 up(&client_sema);
103}
104
105static inline u32
106opaque_hashval(const void *ptr, int nbytes)
107{
108 unsigned char *cptr = (unsigned char *) ptr;
109
110 u32 x = 0;
111 while (nbytes--) {
112 x *= 37;
113 x += *cptr++;
114 }
115 return x;
116}
117
118/* forward declarations */
119static void release_stateowner(struct nfs4_stateowner *sop);
120static void release_stateid(struct nfs4_stateid *stp, int flags);
121static void release_file(struct nfs4_file *fp);
122
123/*
124 * Delegation state
125 */
126
127/* recall_lock protects the del_recall_lru */
128spinlock_t recall_lock;
129static struct list_head del_recall_lru;
130
131static struct nfs4_delegation *
132alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
133{
134 struct nfs4_delegation *dp;
135 struct nfs4_file *fp = stp->st_file;
136 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
137
138 dprintk("NFSD alloc_init_deleg\n");
139 if ((dp = kmalloc(sizeof(struct nfs4_delegation),
140 GFP_KERNEL)) == NULL)
141 return dp;
142 INIT_LIST_HEAD(&dp->dl_del_perfile);
143 INIT_LIST_HEAD(&dp->dl_del_perclnt);
144 INIT_LIST_HEAD(&dp->dl_recall_lru);
145 dp->dl_client = clp;
146 dp->dl_file = fp;
147 dp->dl_flock = NULL;
148 get_file(stp->st_vfs_file);
149 dp->dl_vfs_file = stp->st_vfs_file;
150 dp->dl_type = type;
151 dp->dl_recall.cbr_dp = NULL;
152 dp->dl_recall.cbr_ident = cb->cb_ident;
153 dp->dl_recall.cbr_trunc = 0;
154 dp->dl_stateid.si_boot = boot_time;
155 dp->dl_stateid.si_stateownerid = current_delegid++;
156 dp->dl_stateid.si_fileid = 0;
157 dp->dl_stateid.si_generation = 0;
158 dp->dl_fhlen = current_fh->fh_handle.fh_size;
159 memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
160 current_fh->fh_handle.fh_size);
161 dp->dl_time = 0;
162 atomic_set(&dp->dl_count, 1);
163 list_add(&dp->dl_del_perfile, &fp->fi_del_perfile);
164 list_add(&dp->dl_del_perclnt, &clp->cl_del_perclnt);
165 alloc_delegation++;
166 return dp;
167}
168
169void
170nfs4_put_delegation(struct nfs4_delegation *dp)
171{
172 if (atomic_dec_and_test(&dp->dl_count)) {
173 dprintk("NFSD: freeing dp %p\n",dp);
174 kfree(dp);
175 free_delegation++;
176 }
177}
178
179/* Remove the associated file_lock first, then remove the delegation.
180 * lease_modify() is called to remove the FS_LEASE file_lock from
181 * the i_flock list, eventually calling nfsd's lock_manager
182 * fl_release_callback.
183 */
184static void
185nfs4_close_delegation(struct nfs4_delegation *dp)
186{
187 struct file *filp = dp->dl_vfs_file;
188
189 dprintk("NFSD: close_delegation dp %p\n",dp);
190 dp->dl_vfs_file = NULL;
191 /* The following nfsd_close may not actually close the file,
192 * but we want to remove the lease in any case. */
193 setlease(filp, F_UNLCK, &dp->dl_flock);
194 nfsd_close(filp);
195 vfsclose++;
196}
197
198/* Called under the state lock. */
199static void
200unhash_delegation(struct nfs4_delegation *dp)
201{
202 list_del_init(&dp->dl_del_perfile);
203 list_del_init(&dp->dl_del_perclnt);
204 spin_lock(&recall_lock);
205 list_del_init(&dp->dl_recall_lru);
206 spin_unlock(&recall_lock);
207 nfs4_close_delegation(dp);
208 nfs4_put_delegation(dp);
209}
210
211/*
212 * SETCLIENTID state
213 */
214
215/* Hash tables for nfs4_clientid state */
216#define CLIENT_HASH_BITS 4
217#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
218#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
219
220#define clientid_hashval(id) \
221 ((id) & CLIENT_HASH_MASK)
222#define clientstr_hashval(name, namelen) \
223 (opaque_hashval((name), (namelen)) & CLIENT_HASH_MASK)
224/*
225 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
226 * used in reboot/reset lease grace period processing
227 *
228 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
229 * setclientid_confirmed info.
230 *
231 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
232 * setclientid info.
233 *
234 * client_lru holds client queue ordered by nfs4_client.cl_time
235 * for lease renewal.
236 *
237 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
238 * for last close replay.
239 */
240static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
241static int reclaim_str_hashtbl_size = 0;
242static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
243static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
244static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
245static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
246static struct list_head client_lru;
247static struct list_head close_lru;
248
249static inline void
250renew_client(struct nfs4_client *clp)
251{
252 /*
253 * Move client to the end to the LRU list.
254 */
255 dprintk("renewing client (clientid %08x/%08x)\n",
256 clp->cl_clientid.cl_boot,
257 clp->cl_clientid.cl_id);
258 list_move_tail(&clp->cl_lru, &client_lru);
259 clp->cl_time = get_seconds();
260}
261
262/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
263static int
264STALE_CLIENTID(clientid_t *clid)
265{
266 if (clid->cl_boot == boot_time)
267 return 0;
268 dprintk("NFSD stale clientid (%08x/%08x)\n",
269 clid->cl_boot, clid->cl_id);
270 return 1;
271}
272
273/*
274 * XXX Should we use a slab cache ?
275 * This type of memory management is somewhat inefficient, but we use it
276 * anyway since SETCLIENTID is not a common operation.
277 */
278static inline struct nfs4_client *
279alloc_client(struct xdr_netobj name)
280{
281 struct nfs4_client *clp;
282
283 if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
284 memset(clp, 0, sizeof(*clp));
285 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
286 memcpy(clp->cl_name.data, name.data, name.len);
287 clp->cl_name.len = name.len;
288 }
289 else {
290 kfree(clp);
291 clp = NULL;
292 }
293 }
294 return clp;
295}
296
297static inline void
298free_client(struct nfs4_client *clp)
299{
300 if (clp->cl_cred.cr_group_info)
301 put_group_info(clp->cl_cred.cr_group_info);
302 kfree(clp->cl_name.data);
303 kfree(clp);
304}
305
306void
307put_nfs4_client(struct nfs4_client *clp)
308{
309 if (atomic_dec_and_test(&clp->cl_count))
310 free_client(clp);
311}
312
313static void
314expire_client(struct nfs4_client *clp)
315{
316 struct nfs4_stateowner *sop;
317 struct nfs4_delegation *dp;
318 struct nfs4_callback *cb = &clp->cl_callback;
319 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
320 struct list_head reaplist;
321
322 dprintk("NFSD: expire_client cl_count %d\n",
323 atomic_read(&clp->cl_count));
324
325 /* shutdown rpc client, ending any outstanding recall rpcs */
326 if (atomic_read(&cb->cb_set) == 1 && clnt) {
327 rpc_shutdown_client(clnt);
328 clnt = clp->cl_callback.cb_client = NULL;
329 }
330
331 INIT_LIST_HEAD(&reaplist);
332 spin_lock(&recall_lock);
333 while (!list_empty(&clp->cl_del_perclnt)) {
334 dp = list_entry(clp->cl_del_perclnt.next, struct nfs4_delegation, dl_del_perclnt);
335 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
336 dp->dl_flock);
337 list_del_init(&dp->dl_del_perclnt);
338 list_move(&dp->dl_recall_lru, &reaplist);
339 }
340 spin_unlock(&recall_lock);
341 while (!list_empty(&reaplist)) {
342 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
343 list_del_init(&dp->dl_recall_lru);
344 unhash_delegation(dp);
345 }
346 list_del(&clp->cl_idhash);
347 list_del(&clp->cl_strhash);
348 list_del(&clp->cl_lru);
349 while (!list_empty(&clp->cl_perclient)) {
350 sop = list_entry(clp->cl_perclient.next, struct nfs4_stateowner, so_perclient);
351 release_stateowner(sop);
352 }
353 put_nfs4_client(clp);
354}
355
356static struct nfs4_client *
357create_client(struct xdr_netobj name) {
358 struct nfs4_client *clp;
359
360 if (!(clp = alloc_client(name)))
361 goto out;
362 atomic_set(&clp->cl_count, 1);
363 atomic_set(&clp->cl_callback.cb_set, 0);
364 clp->cl_callback.cb_parsed = 0;
365 INIT_LIST_HEAD(&clp->cl_idhash);
366 INIT_LIST_HEAD(&clp->cl_strhash);
367 INIT_LIST_HEAD(&clp->cl_perclient);
368 INIT_LIST_HEAD(&clp->cl_del_perclnt);
369 INIT_LIST_HEAD(&clp->cl_lru);
370out:
371 return clp;
372}
373
374static void
375copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
376 memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
377}
378
379static void
380copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
381 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
382 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
383}
384
385static void
386copy_cred(struct svc_cred *target, struct svc_cred *source) {
387
388 target->cr_uid = source->cr_uid;
389 target->cr_gid = source->cr_gid;
390 target->cr_group_info = source->cr_group_info;
391 get_group_info(target->cr_group_info);
392}
393
394static int
395cmp_name(struct xdr_netobj *n1, struct xdr_netobj *n2) {
396 if (!n1 || !n2)
397 return 0;
398 return((n1->len == n2->len) && !memcmp(n1->data, n2->data, n2->len));
399}
400
401static int
402cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
403 return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
404}
405
406static int
407cmp_clid(clientid_t * cl1, clientid_t * cl2) {
408 return((cl1->cl_boot == cl2->cl_boot) &&
409 (cl1->cl_id == cl2->cl_id));
410}
411
412/* XXX what about NGROUP */
413static int
414cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
415 return(cr1->cr_uid == cr2->cr_uid);
416
417}
418
419static void
420gen_clid(struct nfs4_client *clp) {
421 clp->cl_clientid.cl_boot = boot_time;
422 clp->cl_clientid.cl_id = current_clientid++;
423}
424
425static void
426gen_confirm(struct nfs4_client *clp) {
427 struct timespec tv;
428 u32 * p;
429
430 tv = CURRENT_TIME;
431 p = (u32 *)clp->cl_confirm.data;
432 *p++ = tv.tv_sec;
433 *p++ = tv.tv_nsec;
434}
435
436static int
437check_name(struct xdr_netobj name) {
438
439 if (name.len == 0)
440 return 0;
441 if (name.len > NFS4_OPAQUE_LIMIT) {
442 printk("NFSD: check_name: name too long(%d)!\n", name.len);
443 return 0;
444 }
445 return 1;
446}
447
448void
449add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
450{
451 unsigned int idhashval;
452
453 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
454 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
455 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
456 list_add_tail(&clp->cl_lru, &client_lru);
457 clp->cl_time = get_seconds();
458}
459
460void
461move_to_confirmed(struct nfs4_client *clp)
462{
463 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
464 unsigned int strhashval;
465
466 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
467 list_del_init(&clp->cl_strhash);
468 list_del_init(&clp->cl_idhash);
469 list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
470 strhashval = clientstr_hashval(clp->cl_name.data,
471 clp->cl_name.len);
472 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
473 renew_client(clp);
474}
475
476static struct nfs4_client *
477find_confirmed_client(clientid_t *clid)
478{
479 struct nfs4_client *clp;
480 unsigned int idhashval = clientid_hashval(clid->cl_id);
481
482 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
483 if (cmp_clid(&clp->cl_clientid, clid))
484 return clp;
485 }
486 return NULL;
487}
488
489static struct nfs4_client *
490find_unconfirmed_client(clientid_t *clid)
491{
492 struct nfs4_client *clp;
493 unsigned int idhashval = clientid_hashval(clid->cl_id);
494
495 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
496 if (cmp_clid(&clp->cl_clientid, clid))
497 return clp;
498 }
499 return NULL;
500}
501
502/* a helper function for parse_callback */
503static int
504parse_octet(unsigned int *lenp, char **addrp)
505{
506 unsigned int len = *lenp;
507 char *p = *addrp;
508 int n = -1;
509 char c;
510
511 for (;;) {
512 if (!len)
513 break;
514 len--;
515 c = *p++;
516 if (c == '.')
517 break;
518 if ((c < '0') || (c > '9')) {
519 n = -1;
520 break;
521 }
522 if (n < 0)
523 n = 0;
524 n = (n * 10) + (c - '0');
525 if (n > 255) {
526 n = -1;
527 break;
528 }
529 }
530 *lenp = len;
531 *addrp = p;
532 return n;
533}
534
535/* parse and set the setclientid ipv4 callback address */
536int
537parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
538{
539 int temp = 0;
540 u32 cbaddr = 0;
541 u16 cbport = 0;
542 u32 addrlen = addr_len;
543 char *addr = addr_val;
544 int i, shift;
545
546 /* ipaddress */
547 shift = 24;
548 for(i = 4; i > 0 ; i--) {
549 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
550 return 0;
551 }
552 cbaddr |= (temp << shift);
553 if (shift > 0)
554 shift -= 8;
555 }
556 *cbaddrp = cbaddr;
557
558 /* port */
559 shift = 8;
560 for(i = 2; i > 0 ; i--) {
561 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
562 return 0;
563 }
564 cbport |= (temp << shift);
565 if (shift > 0)
566 shift -= 8;
567 }
568 *cbportp = cbport;
569 return 1;
570}
571
572void
573gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
574{
575 struct nfs4_callback *cb = &clp->cl_callback;
576
577 /* Currently, we only support tcp for the callback channel */
578 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
579 goto out_err;
580
581 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
582 &cb->cb_addr, &cb->cb_port)))
583 goto out_err;
584 cb->cb_prog = se->se_callback_prog;
585 cb->cb_ident = se->se_callback_ident;
586 cb->cb_parsed = 1;
587 return;
588out_err:
589 printk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
590 "will not receive delegations\n",
591 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
592
593 cb->cb_parsed = 0;
594 return;
595}
596
597/*
598 * RFC 3010 has a complex implmentation description of processing a
599 * SETCLIENTID request consisting of 5 bullets, labeled as
600 * CASE0 - CASE4 below.
601 *
602 * NOTES:
603 * callback information will be processed in a future patch
604 *
605 * an unconfirmed record is added when:
606 * NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
607 * CASE 1: confirmed record found with matching name, principal,
608 * verifier, and clientid.
609 * CASE 2: confirmed record found with matching name, principal,
610 * and there is no unconfirmed record with matching
611 * name and principal
612 *
613 * an unconfirmed record is replaced when:
614 * CASE 3: confirmed record found with matching name, principal,
615 * and an unconfirmed record is found with matching
616 * name, principal, and with clientid and
617 * confirm that does not match the confirmed record.
618 * CASE 4: there is no confirmed record with matching name and
619 * principal. there is an unconfirmed record with
620 * matching name, principal.
621 *
622 * an unconfirmed record is deleted when:
623 * CASE 1: an unconfirmed record that matches input name, verifier,
624 * and confirmed clientid.
625 * CASE 4: any unconfirmed records with matching name and principal
626 * that exist after an unconfirmed record has been replaced
627 * as described above.
628 *
629 */
630int
631nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid)
632{
633 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
634 struct xdr_netobj clname = {
635 .len = setclid->se_namelen,
636 .data = setclid->se_name,
637 };
638 nfs4_verifier clverifier = setclid->se_verf;
639 unsigned int strhashval;
640 struct nfs4_client * conf, * unconf, * new, * clp;
641 int status;
642
643 status = nfserr_inval;
644 if (!check_name(clname))
645 goto out;
646
647 /*
648 * XXX The Duplicate Request Cache (DRC) has been checked (??)
649 * We get here on a DRC miss.
650 */
651
652 strhashval = clientstr_hashval(clname.data, clname.len);
653
654 conf = NULL;
655 nfs4_lock_state();
656 list_for_each_entry(clp, &conf_str_hashtbl[strhashval], cl_strhash) {
657 if (!cmp_name(&clp->cl_name, &clname))
658 continue;
659 /*
660 * CASE 0:
661 * clname match, confirmed, different principal
662 * or different ip_address
663 */
664 status = nfserr_clid_inuse;
665 if (!cmp_creds(&clp->cl_cred,&rqstp->rq_cred)) {
666 printk("NFSD: setclientid: string in use by client"
667 "(clientid %08x/%08x)\n",
668 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
669 goto out;
670 }
671 if (clp->cl_addr != ip_addr) {
672 printk("NFSD: setclientid: string in use by client"
673 "(clientid %08x/%08x)\n",
674 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
675 goto out;
676 }
677
678 /*
679 * cl_name match from a previous SETCLIENTID operation
680 * XXX check for additional matches?
681 */
682 conf = clp;
683 break;
684 }
685 unconf = NULL;
686 list_for_each_entry(clp, &unconf_str_hashtbl[strhashval], cl_strhash) {
687 if (!cmp_name(&clp->cl_name, &clname))
688 continue;
689 /* cl_name match from a previous SETCLIENTID operation */
690 unconf = clp;
691 break;
692 }
693 status = nfserr_resource;
694 if (!conf) {
695 /*
696 * CASE 4:
697 * placed first, because it is the normal case.
698 */
699 if (unconf)
700 expire_client(unconf);
701 if (!(new = create_client(clname)))
702 goto out;
703 copy_verf(new, &clverifier);
704 new->cl_addr = ip_addr;
705 copy_cred(&new->cl_cred,&rqstp->rq_cred);
706 gen_clid(new);
707 gen_confirm(new);
708 gen_callback(new, setclid);
709 add_to_unconfirmed(new, strhashval);
710 } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
711 /*
712 * CASE 1:
713 * cl_name match, confirmed, principal match
714 * verifier match: probable callback update
715 *
716 * remove any unconfirmed nfs4_client with
717 * matching cl_name, cl_verifier, and cl_clientid
718 *
719 * create and insert an unconfirmed nfs4_client with same
720 * cl_name, cl_verifier, and cl_clientid as existing
721 * nfs4_client, but with the new callback info and a
722 * new cl_confirm
723 */
724 if ((unconf) &&
725 cmp_verf(&unconf->cl_verifier, &conf->cl_verifier) &&
726 cmp_clid(&unconf->cl_clientid, &conf->cl_clientid)) {
727 expire_client(unconf);
728 }
729 if (!(new = create_client(clname)))
730 goto out;
731 copy_verf(new,&conf->cl_verifier);
732 new->cl_addr = ip_addr;
733 copy_cred(&new->cl_cred,&rqstp->rq_cred);
734 copy_clid(new, conf);
735 gen_confirm(new);
736 gen_callback(new, setclid);
737 add_to_unconfirmed(new,strhashval);
738 } else if (!unconf) {
739 /*
740 * CASE 2:
741 * clname match, confirmed, principal match
742 * verfier does not match
743 * no unconfirmed. create a new unconfirmed nfs4_client
744 * using input clverifier, clname, and callback info
745 * and generate a new cl_clientid and cl_confirm.
746 */
747 if (!(new = create_client(clname)))
748 goto out;
749 copy_verf(new,&clverifier);
750 new->cl_addr = ip_addr;
751 copy_cred(&new->cl_cred,&rqstp->rq_cred);
752 gen_clid(new);
753 gen_confirm(new);
754 gen_callback(new, setclid);
755 add_to_unconfirmed(new, strhashval);
756 } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
757 /*
758 * CASE3:
759 * confirmed found (name, principal match)
760 * confirmed verifier does not match input clverifier
761 *
762 * unconfirmed found (name match)
763 * confirmed->cl_confirm != unconfirmed->cl_confirm
764 *
765 * remove unconfirmed.
766 *
767 * create an unconfirmed nfs4_client
768 * with same cl_name as existing confirmed nfs4_client,
769 * but with new callback info, new cl_clientid,
770 * new cl_verifier and a new cl_confirm
771 */
772 expire_client(unconf);
773 if (!(new = create_client(clname)))
774 goto out;
775 copy_verf(new,&clverifier);
776 new->cl_addr = ip_addr;
777 copy_cred(&new->cl_cred,&rqstp->rq_cred);
778 gen_clid(new);
779 gen_confirm(new);
780 gen_callback(new, setclid);
781 add_to_unconfirmed(new, strhashval);
782 } else {
783 /* No cases hit !!! */
784 status = nfserr_inval;
785 goto out;
786
787 }
788 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
789 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
790 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
791 status = nfs_ok;
792out:
793 nfs4_unlock_state();
794 return status;
795}
796
797
798/*
799 * RFC 3010 has a complex implmentation description of processing a
800 * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
801 * processing on a DRC miss, labeled as CASE1 - CASE4 below.
802 *
803 * NOTE: callback information will be processed here in a future patch
804 */
805int
806nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm)
807{
808 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
809 struct nfs4_client *clp, *conf = NULL, *unconf = NULL;
810 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
811 clientid_t * clid = &setclientid_confirm->sc_clientid;
812 int status;
813
814 if (STALE_CLIENTID(clid))
815 return nfserr_stale_clientid;
816 /*
817 * XXX The Duplicate Request Cache (DRC) has been checked (??)
818 * We get here on a DRC miss.
819 */
820
821 nfs4_lock_state();
822 clp = find_confirmed_client(clid);
823 if (clp) {
824 status = nfserr_inval;
825 /*
826 * Found a record for this clientid. If the IP addresses
827 * don't match, return ERR_INVAL just as if the record had
828 * not been found.
829 */
830 if (clp->cl_addr != ip_addr) {
831 printk("NFSD: setclientid: string in use by client"
832 "(clientid %08x/%08x)\n",
833 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
834 goto out;
835 }
836 conf = clp;
837 }
838 clp = find_unconfirmed_client(clid);
839 if (clp) {
840 status = nfserr_inval;
841 if (clp->cl_addr != ip_addr) {
842 printk("NFSD: setclientid: string in use by client"
843 "(clientid %08x/%08x)\n",
844 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
845 goto out;
846 }
847 unconf = clp;
848 }
849 /* CASE 1:
850 * unconf record that matches input clientid and input confirm.
851 * conf record that matches input clientid.
852 * conf and unconf records match names, verifiers
853 */
854 if ((conf && unconf) &&
855 (cmp_verf(&unconf->cl_confirm, &confirm)) &&
856 (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
857 (cmp_name(&conf->cl_name,&unconf->cl_name)) &&
858 (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
859 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
860 status = nfserr_clid_inuse;
861 else {
862 expire_client(conf);
863 clp = unconf;
864 move_to_confirmed(unconf);
865 status = nfs_ok;
866 }
867 goto out;
868 }
869 /* CASE 2:
870 * conf record that matches input clientid.
871 * if unconf record that matches input clientid, then unconf->cl_name
872 * or unconf->cl_verifier don't match the conf record.
873 */
874 if ((conf && !unconf) ||
875 ((conf && unconf) &&
876 (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
877 !cmp_name(&conf->cl_name, &unconf->cl_name)))) {
878 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred)) {
879 status = nfserr_clid_inuse;
880 } else {
881 clp = conf;
882 status = nfs_ok;
883 }
884 goto out;
885 }
886 /* CASE 3:
887 * conf record not found.
888 * unconf record found.
889 * unconf->cl_confirm matches input confirm
890 */
891 if (!conf && unconf && cmp_verf(&unconf->cl_confirm, &confirm)) {
892 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
893 status = nfserr_clid_inuse;
894 } else {
895 status = nfs_ok;
896 clp = unconf;
897 move_to_confirmed(unconf);
898 }
899 goto out;
900 }
901 /* CASE 4:
902 * conf record not found, or if conf, then conf->cl_confirm does not
903 * match input confirm.
904 * unconf record not found, or if unconf, then unconf->cl_confirm
905 * does not match input confirm.
906 */
907 if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm))) &&
908 (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm, &confirm)))) {
909 status = nfserr_stale_clientid;
910 goto out;
911 }
912 /* check that we have hit one of the cases...*/
913 status = nfserr_inval;
914 goto out;
915out:
916 if (!status)
917 nfsd4_probe_callback(clp);
918 nfs4_unlock_state();
919 return status;
920}
921
922/*
923 * Open owner state (share locks)
924 */
925
926/* hash tables for nfs4_stateowner */
927#define OWNER_HASH_BITS 8
928#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
929#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
930
931#define ownerid_hashval(id) \
932 ((id) & OWNER_HASH_MASK)
933#define ownerstr_hashval(clientid, ownername) \
934 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
935
936static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
937static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
938
939/* hash table for nfs4_file */
940#define FILE_HASH_BITS 8
941#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
942#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
943/* hash table for (open)nfs4_stateid */
944#define STATEID_HASH_BITS 10
945#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
946#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
947
948#define file_hashval(x) \
949 hash_ptr(x, FILE_HASH_BITS)
950#define stateid_hashval(owner_id, file_id) \
951 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
952
953static struct list_head file_hashtbl[FILE_HASH_SIZE];
954static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
955
956/* OPEN Share state helper functions */
957static inline struct nfs4_file *
958alloc_init_file(struct inode *ino)
959{
960 struct nfs4_file *fp;
961 unsigned int hashval = file_hashval(ino);
962
963 if ((fp = kmalloc(sizeof(struct nfs4_file),GFP_KERNEL))) {
964 INIT_LIST_HEAD(&fp->fi_hash);
965 INIT_LIST_HEAD(&fp->fi_perfile);
966 INIT_LIST_HEAD(&fp->fi_del_perfile);
967 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
968 fp->fi_inode = igrab(ino);
969 fp->fi_id = current_fileid++;
970 alloc_file++;
971 return fp;
972 }
973 return NULL;
974}
975
976static void
977release_all_files(void)
978{
979 int i;
980 struct nfs4_file *fp;
981
982 for (i=0;i<FILE_HASH_SIZE;i++) {
983 while (!list_empty(&file_hashtbl[i])) {
984 fp = list_entry(file_hashtbl[i].next, struct nfs4_file, fi_hash);
985 /* this should never be more than once... */
986 if (!list_empty(&fp->fi_perfile) || !list_empty(&fp->fi_del_perfile)) {
987 printk("ERROR: release_all_files: file %p is open, creating dangling state !!!\n",fp);
988 }
989 release_file(fp);
990 }
991 }
992}
993
994kmem_cache_t *stateowner_slab = NULL;
995
996static int
997nfsd4_init_slabs(void)
998{
999 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1000 sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1001 if (stateowner_slab == NULL) {
1002 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1003 return -ENOMEM;
1004 }
1005 return 0;
1006}
1007
1008static void
1009nfsd4_free_slabs(void)
1010{
1011 int status = 0;
1012
1013 if (stateowner_slab)
1014 status = kmem_cache_destroy(stateowner_slab);
1015 stateowner_slab = NULL;
1016 BUG_ON(status);
1017}
1018
1019void
1020nfs4_free_stateowner(struct kref *kref)
1021{
1022 struct nfs4_stateowner *sop =
1023 container_of(kref, struct nfs4_stateowner, so_ref);
1024 kfree(sop->so_owner.data);
1025 kmem_cache_free(stateowner_slab, sop);
1026}
1027
1028static inline struct nfs4_stateowner *
1029alloc_stateowner(struct xdr_netobj *owner)
1030{
1031 struct nfs4_stateowner *sop;
1032
1033 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1034 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1035 memcpy(sop->so_owner.data, owner->data, owner->len);
1036 sop->so_owner.len = owner->len;
1037 kref_init(&sop->so_ref);
1038 return sop;
1039 }
1040 kmem_cache_free(stateowner_slab, sop);
1041 }
1042 return NULL;
1043}
1044
1045static struct nfs4_stateowner *
1046alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1047 struct nfs4_stateowner *sop;
1048 struct nfs4_replay *rp;
1049 unsigned int idhashval;
1050
1051 if (!(sop = alloc_stateowner(&open->op_owner)))
1052 return NULL;
1053 idhashval = ownerid_hashval(current_ownerid);
1054 INIT_LIST_HEAD(&sop->so_idhash);
1055 INIT_LIST_HEAD(&sop->so_strhash);
1056 INIT_LIST_HEAD(&sop->so_perclient);
1057 INIT_LIST_HEAD(&sop->so_perfilestate);
1058 INIT_LIST_HEAD(&sop->so_perlockowner); /* not used */
1059 INIT_LIST_HEAD(&sop->so_close_lru);
1060 sop->so_time = 0;
1061 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1062 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1063 list_add(&sop->so_perclient, &clp->cl_perclient);
1064 add_perclient++;
1065 sop->so_is_open_owner = 1;
1066 sop->so_id = current_ownerid++;
1067 sop->so_client = clp;
1068 sop->so_seqid = open->op_seqid;
1069 sop->so_confirmed = 0;
1070 rp = &sop->so_replay;
1071 rp->rp_status = NFSERR_SERVERFAULT;
1072 rp->rp_buflen = 0;
1073 rp->rp_buf = rp->rp_ibuf;
1074 return sop;
1075}
1076
1077static void
1078release_stateid_lockowners(struct nfs4_stateid *open_stp)
1079{
1080 struct nfs4_stateowner *lock_sop;
1081
1082 while (!list_empty(&open_stp->st_perlockowner)) {
1083 lock_sop = list_entry(open_stp->st_perlockowner.next,
1084 struct nfs4_stateowner, so_perlockowner);
1085 /* list_del(&open_stp->st_perlockowner); */
1086 BUG_ON(lock_sop->so_is_open_owner);
1087 release_stateowner(lock_sop);
1088 }
1089}
1090
1091static void
1092unhash_stateowner(struct nfs4_stateowner *sop)
1093{
1094 struct nfs4_stateid *stp;
1095
1096 list_del(&sop->so_idhash);
1097 list_del(&sop->so_strhash);
1098 if (sop->so_is_open_owner) {
1099 list_del(&sop->so_perclient);
1100 del_perclient++;
1101 }
1102 list_del(&sop->so_perlockowner);
1103 while (!list_empty(&sop->so_perfilestate)) {
1104 stp = list_entry(sop->so_perfilestate.next,
1105 struct nfs4_stateid, st_perfilestate);
1106 if (sop->so_is_open_owner)
1107 release_stateid(stp, OPEN_STATE);
1108 else
1109 release_stateid(stp, LOCK_STATE);
1110 }
1111}
1112
1113static void
1114release_stateowner(struct nfs4_stateowner *sop)
1115{
1116 unhash_stateowner(sop);
1117 list_del(&sop->so_close_lru);
1118 nfs4_put_stateowner(sop);
1119}
1120
1121static inline void
1122init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1123 struct nfs4_stateowner *sop = open->op_stateowner;
1124 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1125
1126 INIT_LIST_HEAD(&stp->st_hash);
1127 INIT_LIST_HEAD(&stp->st_perfilestate);
1128 INIT_LIST_HEAD(&stp->st_perlockowner);
1129 INIT_LIST_HEAD(&stp->st_perfile);
1130 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1131 list_add(&stp->st_perfilestate, &sop->so_perfilestate);
1132 list_add_perfile++;
1133 list_add(&stp->st_perfile, &fp->fi_perfile);
1134 stp->st_stateowner = sop;
1135 stp->st_file = fp;
1136 stp->st_stateid.si_boot = boot_time;
1137 stp->st_stateid.si_stateownerid = sop->so_id;
1138 stp->st_stateid.si_fileid = fp->fi_id;
1139 stp->st_stateid.si_generation = 0;
1140 stp->st_access_bmap = 0;
1141 stp->st_deny_bmap = 0;
1142 __set_bit(open->op_share_access, &stp->st_access_bmap);
1143 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1144}
1145
1146static void
1147release_stateid(struct nfs4_stateid *stp, int flags)
1148{
1149 struct file *filp = stp->st_vfs_file;
1150
1151 list_del(&stp->st_hash);
1152 list_del_perfile++;
1153 list_del(&stp->st_perfile);
1154 list_del(&stp->st_perfilestate);
1155 if (flags & OPEN_STATE) {
1156 release_stateid_lockowners(stp);
1157 stp->st_vfs_file = NULL;
1158 nfsd_close(filp);
1159 vfsclose++;
1160 } else if (flags & LOCK_STATE)
1161 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
1162 kfree(stp);
1163 stp = NULL;
1164}
1165
1166static void
1167release_file(struct nfs4_file *fp)
1168{
1169 free_file++;
1170 list_del(&fp->fi_hash);
1171 iput(fp->fi_inode);
1172 kfree(fp);
1173}
1174
1175void
1176move_to_close_lru(struct nfs4_stateowner *sop)
1177{
1178 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1179
1180 unhash_stateowner(sop);
1181 list_add_tail(&sop->so_close_lru, &close_lru);
1182 sop->so_time = get_seconds();
1183}
1184
1185void
1186release_state_owner(struct nfs4_stateid *stp, int flag)
1187{
1188 struct nfs4_stateowner *sop = stp->st_stateowner;
1189 struct nfs4_file *fp = stp->st_file;
1190
1191 dprintk("NFSD: release_state_owner\n");
1192 release_stateid(stp, flag);
1193
1194 /* place unused nfs4_stateowners on so_close_lru list to be
1195 * released by the laundromat service after the lease period
1196 * to enable us to handle CLOSE replay
1197 */
1198 if (sop->so_confirmed && list_empty(&sop->so_perfilestate))
1199 move_to_close_lru(sop);
1200 /* unused nfs4_file's are releseed. XXX slab cache? */
1201 if (list_empty(&fp->fi_perfile) && list_empty(&fp->fi_del_perfile)) {
1202 release_file(fp);
1203 }
1204}
1205
1206static int
1207cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1208 return ((sop->so_owner.len == owner->len) &&
1209 !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1210 (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1211}
1212
1213static struct nfs4_stateowner *
1214find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1215{
1216 struct nfs4_stateowner *so = NULL;
1217
1218 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1219 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1220 return so;
1221 }
1222 return NULL;
1223}
1224
1225/* search file_hashtbl[] for file */
1226static struct nfs4_file *
1227find_file(struct inode *ino)
1228{
1229 unsigned int hashval = file_hashval(ino);
1230 struct nfs4_file *fp;
1231
1232 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
1233 if (fp->fi_inode == ino)
1234 return fp;
1235 }
1236 return NULL;
1237}
1238
1239#define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
1240#define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
1241
1242void
1243set_access(unsigned int *access, unsigned long bmap) {
1244 int i;
1245
1246 *access = 0;
1247 for (i = 1; i < 4; i++) {
1248 if (test_bit(i, &bmap))
1249 *access |= i;
1250 }
1251}
1252
1253void
1254set_deny(unsigned int *deny, unsigned long bmap) {
1255 int i;
1256
1257 *deny = 0;
1258 for (i = 0; i < 4; i++) {
1259 if (test_bit(i, &bmap))
1260 *deny |= i ;
1261 }
1262}
1263
1264static int
1265test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1266 unsigned int access, deny;
1267
1268 set_access(&access, stp->st_access_bmap);
1269 set_deny(&deny, stp->st_deny_bmap);
1270 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1271 return 0;
1272 return 1;
1273}
1274
1275/*
1276 * Called to check deny when READ with all zero stateid or
1277 * WRITE with all zero or all one stateid
1278 */
1279int
1280nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1281{
1282 struct inode *ino = current_fh->fh_dentry->d_inode;
1283 struct nfs4_file *fp;
1284 struct nfs4_stateid *stp;
1285
1286 dprintk("NFSD: nfs4_share_conflict\n");
1287
1288 fp = find_file(ino);
1289 if (fp) {
1290 /* Search for conflicting share reservations */
1291 list_for_each_entry(stp, &fp->fi_perfile, st_perfile) {
1292 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1293 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1294 return nfserr_share_denied;
1295 }
1296 }
1297 return nfs_ok;
1298}
1299
1300static inline void
1301nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1302{
1303 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1304 put_write_access(filp->f_dentry->d_inode);
1305 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1306 }
1307}
1308
1309/*
1310 * Recall a delegation
1311 */
1312static int
1313do_recall(void *__dp)
1314{
1315 struct nfs4_delegation *dp = __dp;
1316
1317 daemonize("nfsv4-recall");
1318
1319 nfsd4_cb_recall(dp);
1320 return 0;
1321}
1322
1323/*
1324 * Spawn a thread to perform a recall on the delegation represented
1325 * by the lease (file_lock)
1326 *
1327 * Called from break_lease() with lock_kernel() held.
1328 * Note: we assume break_lease will only call this *once* for any given
1329 * lease.
1330 */
1331static
1332void nfsd_break_deleg_cb(struct file_lock *fl)
1333{
1334 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1335 struct task_struct *t;
1336
1337 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1338 if (!dp)
1339 return;
1340
1341 /* We're assuming the state code never drops its reference
1342 * without first removing the lease. Since we're in this lease
1343 * callback (and since the lease code is serialized by the kernel
1344 * lock) we know the server hasn't removed the lease yet, we know
1345 * it's safe to take a reference: */
1346 atomic_inc(&dp->dl_count);
1347
1348 spin_lock(&recall_lock);
1349 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1350 spin_unlock(&recall_lock);
1351
1352 /* only place dl_time is set. protected by lock_kernel*/
1353 dp->dl_time = get_seconds();
1354
1355 /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1356 fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1357
1358 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1359 if (IS_ERR(t)) {
1360 struct nfs4_client *clp = dp->dl_client;
1361
1362 printk(KERN_INFO "NFSD: Callback thread failed for "
1363 "for client (clientid %08x/%08x)\n",
1364 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1365 nfs4_put_delegation(dp);
1366 }
1367}
1368
1369/*
1370 * The file_lock is being reapd.
1371 *
1372 * Called by locks_free_lock() with lock_kernel() held.
1373 */
1374static
1375void nfsd_release_deleg_cb(struct file_lock *fl)
1376{
1377 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1378
1379 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1380
1381 if (!(fl->fl_flags & FL_LEASE) || !dp)
1382 return;
1383 dp->dl_flock = NULL;
1384}
1385
1386/*
1387 * Set the delegation file_lock back pointer.
1388 *
1389 * Called from __setlease() with lock_kernel() held.
1390 */
1391static
1392void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1393{
1394 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1395
1396 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1397 if (!dp)
1398 return;
1399 dp->dl_flock = new;
1400}
1401
1402/*
1403 * Called from __setlease() with lock_kernel() held
1404 */
1405static
1406int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1407{
1408 struct nfs4_delegation *onlistd =
1409 (struct nfs4_delegation *)onlist->fl_owner;
1410 struct nfs4_delegation *tryd =
1411 (struct nfs4_delegation *)try->fl_owner;
1412
1413 if (onlist->fl_lmops != try->fl_lmops)
1414 return 0;
1415
1416 return onlistd->dl_client == tryd->dl_client;
1417}
1418
1419
1420static
1421int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1422{
1423 if (arg & F_UNLCK)
1424 return lease_modify(onlist, arg);
1425 else
1426 return -EAGAIN;
1427}
1428
1429struct lock_manager_operations nfsd_lease_mng_ops = {
1430 .fl_break = nfsd_break_deleg_cb,
1431 .fl_release_private = nfsd_release_deleg_cb,
1432 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1433 .fl_mylease = nfsd_same_client_deleg_cb,
1434 .fl_change = nfsd_change_deleg_cb,
1435};
1436
1437
1438/*
1439 * nfsd4_process_open1()
1440 * lookup stateowner.
1441 * found:
1442 * check confirmed
1443 * confirmed:
1444 * check seqid
1445 * not confirmed:
1446 * delete owner
1447 * create new owner
1448 * notfound:
1449 * verify clientid
1450 * create new owner
1451 *
1452 * called with nfs4_lock_state() held.
1453 */
1454int
1455nfsd4_process_open1(struct nfsd4_open *open)
1456{
1457 int status;
1458 clientid_t *clientid = &open->op_clientid;
1459 struct nfs4_client *clp = NULL;
1460 unsigned int strhashval;
1461 struct nfs4_stateowner *sop = NULL;
1462
1463 status = nfserr_inval;
1464 if (!check_name(open->op_owner))
1465 goto out;
1466
1467 if (STALE_CLIENTID(&open->op_clientid))
1468 return nfserr_stale_clientid;
1469
1470 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1471 sop = find_openstateowner_str(strhashval, open);
1472 if (sop) {
1473 open->op_stateowner = sop;
1474 /* check for replay */
1475 if (open->op_seqid == sop->so_seqid){
1476 if (sop->so_replay.rp_buflen)
1477 return NFSERR_REPLAY_ME;
1478 else {
1479 /* The original OPEN failed so spectacularly
1480 * that we don't even have replay data saved!
1481 * Therefore, we have no choice but to continue
1482 * processing this OPEN; presumably, we'll
1483 * fail again for the same reason.
1484 */
1485 dprintk("nfsd4_process_open1:"
1486 " replay with no replay cache\n");
1487 goto renew;
1488 }
1489 } else if (sop->so_confirmed) {
1490 if (open->op_seqid == sop->so_seqid + 1)
1491 goto renew;
1492 status = nfserr_bad_seqid;
1493 goto out;
1494 } else {
1495 /* If we get here, we received an OPEN for an
1496 * unconfirmed nfs4_stateowner. Since the seqid's are
1497 * different, purge the existing nfs4_stateowner, and
1498 * instantiate a new one.
1499 */
1500 clp = sop->so_client;
1501 release_stateowner(sop);
1502 }
1503 } else {
1504 /* nfs4_stateowner not found.
1505 * Verify clientid and instantiate new nfs4_stateowner.
1506 * If verify fails this is presumably the result of the
1507 * client's lease expiring.
1508 */
1509 status = nfserr_expired;
1510 clp = find_confirmed_client(clientid);
1511 if (clp == NULL)
1512 goto out;
1513 }
1514 status = nfserr_resource;
1515 sop = alloc_init_open_stateowner(strhashval, clp, open);
1516 if (sop == NULL)
1517 goto out;
1518 open->op_stateowner = sop;
1519renew:
1520 status = nfs_ok;
1521 renew_client(sop->so_client);
1522out:
1523 if (status && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1524 status = nfserr_reclaim_bad;
1525 return status;
1526}
1527
1528static int
1529nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1530{
1531 struct nfs4_stateid *local;
1532 int status = nfserr_share_denied;
1533 struct nfs4_stateowner *sop = open->op_stateowner;
1534
1535 list_for_each_entry(local, &fp->fi_perfile, st_perfile) {
1536 /* ignore lock owners */
1537 if (local->st_stateowner->so_is_open_owner == 0)
1538 continue;
1539 /* remember if we have seen this open owner */
1540 if (local->st_stateowner == sop)
1541 *stpp = local;
1542 /* check for conflicting share reservations */
1543 if (!test_share(local, open))
1544 goto out;
1545 }
1546 status = 0;
1547out:
1548 return status;
1549}
1550
1551static int
1552nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
1553 struct svc_fh *cur_fh, int flags)
1554{
1555 struct nfs4_stateid *stp;
1556 int status;
1557
1558 stp = kmalloc(sizeof(struct nfs4_stateid), GFP_KERNEL);
1559 if (stp == NULL)
1560 return nfserr_resource;
1561
1562 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags, &stp->st_vfs_file);
1563 if (status) {
1564 if (status == nfserr_dropit)
1565 status = nfserr_jukebox;
1566 kfree(stp);
1567 return status;
1568 }
1569 vfsopen++;
1570 *stpp = stp;
1571 return 0;
1572}
1573
1574static inline int
1575nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1576 struct nfsd4_open *open)
1577{
1578 struct iattr iattr = {
1579 .ia_valid = ATTR_SIZE,
1580 .ia_size = 0,
1581 };
1582 if (!open->op_truncate)
1583 return 0;
1584 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1585 return -EINVAL;
1586 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1587}
1588
1589static int
1590nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1591{
1592 struct file *filp = stp->st_vfs_file;
1593 struct inode *inode = filp->f_dentry->d_inode;
1594 unsigned int share_access;
1595 int status;
1596
1597 set_access(&share_access, stp->st_access_bmap);
1598 share_access = ~share_access;
1599 share_access &= open->op_share_access;
1600
1601 if (!(share_access & NFS4_SHARE_ACCESS_WRITE))
1602 return nfsd4_truncate(rqstp, cur_fh, open);
1603
1604 status = get_write_access(inode);
1605 if (status)
1606 return nfserrno(status);
1607 status = nfsd4_truncate(rqstp, cur_fh, open);
1608 if (status) {
1609 put_write_access(inode);
1610 return status;
1611 }
1612 /* remember the open */
1613 filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
1614 set_bit(open->op_share_access, &stp->st_access_bmap);
1615 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1616
1617 return nfs_ok;
1618}
1619
1620
1621/* decrement seqid on successful reclaim, it will be bumped in encode_open */
1622static void
1623nfs4_set_claim_prev(struct nfsd4_open *open, int *status)
1624{
1625 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
1626 if (*status)
1627 *status = nfserr_reclaim_bad;
1628 else {
1629 open->op_stateowner->so_confirmed = 1;
1630 open->op_stateowner->so_seqid--;
1631 }
1632 }
1633}
1634
1635/*
1636 * Attempt to hand out a delegation.
1637 */
1638static void
1639nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1640{
1641 struct nfs4_delegation *dp;
1642 struct nfs4_stateowner *sop = stp->st_stateowner;
1643 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1644 struct file_lock fl, *flp = &fl;
1645 int status, flag = 0;
1646
1647 flag = NFS4_OPEN_DELEGATE_NONE;
1648 if (open->op_claim_type != NFS4_OPEN_CLAIM_NULL
1649 || !atomic_read(&cb->cb_set) || !sop->so_confirmed)
1650 goto out;
1651
1652 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1653 flag = NFS4_OPEN_DELEGATE_WRITE;
1654 else
1655 flag = NFS4_OPEN_DELEGATE_READ;
1656
1657 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1658 if (dp == NULL) {
1659 flag = NFS4_OPEN_DELEGATE_NONE;
1660 goto out;
1661 }
1662 locks_init_lock(&fl);
1663 fl.fl_lmops = &nfsd_lease_mng_ops;
1664 fl.fl_flags = FL_LEASE;
1665 fl.fl_end = OFFSET_MAX;
1666 fl.fl_owner = (fl_owner_t)dp;
1667 fl.fl_file = stp->st_vfs_file;
1668 fl.fl_pid = current->tgid;
1669
1670 /* setlease checks to see if delegation should be handed out.
1671 * the lock_manager callbacks fl_mylease and fl_change are used
1672 */
1673 if ((status = setlease(stp->st_vfs_file,
1674 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1675 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
1676 list_del(&dp->dl_del_perfile);
1677 list_del(&dp->dl_del_perclnt);
1678 nfs4_put_delegation(dp);
1679 free_delegation++;
1680 flag = NFS4_OPEN_DELEGATE_NONE;
1681 goto out;
1682 }
1683
1684 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1685
1686 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1687 dp->dl_stateid.si_boot,
1688 dp->dl_stateid.si_stateownerid,
1689 dp->dl_stateid.si_fileid,
1690 dp->dl_stateid.si_generation);
1691out:
1692 open->op_delegate_type = flag;
1693}
1694
1695/*
1696 * called with nfs4_lock_state() held.
1697 */
1698int
1699nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1700{
1701 struct nfs4_file *fp = NULL;
1702 struct inode *ino = current_fh->fh_dentry->d_inode;
1703 struct nfs4_stateid *stp = NULL;
1704 int status;
1705
1706 status = nfserr_inval;
1707 if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1708 goto out;
1709 /*
1710 * Lookup file; if found, lookup stateid and check open request,
1711 * and check for delegations in the process of being recalled.
1712 * If not found, create the nfs4_file struct
1713 */
1714 fp = find_file(ino);
1715 if (fp) {
1716 if ((status = nfs4_check_open(fp, open, &stp)))
1717 goto out;
1718 } else {
1719 status = nfserr_resource;
1720 fp = alloc_init_file(ino);
1721 if (fp == NULL)
1722 goto out;
1723 }
1724
1725 /*
1726 * OPEN the file, or upgrade an existing OPEN.
1727 * If truncate fails, the OPEN fails.
1728 */
1729 if (stp) {
1730 /* Stateid was found, this is an OPEN upgrade */
1731 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1732 if (status)
1733 goto out;
1734 } else {
1735 /* Stateid was not found, this is a new OPEN */
1736 int flags = 0;
1737 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1738 flags = MAY_WRITE;
1739 else
1740 flags = MAY_READ;
1741 if ((status = nfs4_new_open(rqstp, &stp, current_fh, flags)))
1742 goto out;
1743 init_stateid(stp, fp, open);
1744 status = nfsd4_truncate(rqstp, current_fh, open);
1745 if (status) {
1746 release_stateid(stp, OPEN_STATE);
1747 goto out;
1748 }
1749 }
1750 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1751
1752 /*
1753 * Attempt to hand out a delegation. No error return, because the
1754 * OPEN succeeds even if we fail.
1755 */
1756 nfs4_open_delegation(current_fh, open, stp);
1757
1758 status = nfs_ok;
1759
1760 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1761 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1762 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1763out:
1764 /* take the opportunity to clean up unused state */
1765 if (fp && list_empty(&fp->fi_perfile) && list_empty(&fp->fi_del_perfile))
1766 release_file(fp);
1767
1768 /* CLAIM_PREVIOUS has different error returns */
1769 nfs4_set_claim_prev(open, &status);
1770 /*
1771 * To finish the open response, we just need to set the rflags.
1772 */
1773 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1774 if (!open->op_stateowner->so_confirmed)
1775 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1776
1777 return status;
1778}
1779
1780static struct work_struct laundromat_work;
1781static void laundromat_main(void *);
1782static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1783
1784int
1785nfsd4_renew(clientid_t *clid)
1786{
1787 struct nfs4_client *clp;
1788 int status;
1789
1790 nfs4_lock_state();
1791 dprintk("process_renew(%08x/%08x): starting\n",
1792 clid->cl_boot, clid->cl_id);
1793 status = nfserr_stale_clientid;
1794 if (STALE_CLIENTID(clid))
1795 goto out;
1796 clp = find_confirmed_client(clid);
1797 status = nfserr_expired;
1798 if (clp == NULL) {
1799 /* We assume the client took too long to RENEW. */
1800 dprintk("nfsd4_renew: clientid not found!\n");
1801 goto out;
1802 }
1803 renew_client(clp);
1804 status = nfserr_cb_path_down;
1805 if (!list_empty(&clp->cl_del_perclnt)
1806 && !atomic_read(&clp->cl_callback.cb_set))
1807 goto out;
1808 status = nfs_ok;
1809out:
1810 nfs4_unlock_state();
1811 return status;
1812}
1813
1814time_t
1815nfs4_laundromat(void)
1816{
1817 struct nfs4_client *clp;
1818 struct nfs4_stateowner *sop;
1819 struct nfs4_delegation *dp;
1820 struct list_head *pos, *next, reaplist;
1821 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1822 time_t t, clientid_val = NFSD_LEASE_TIME;
1823 time_t u, test_val = NFSD_LEASE_TIME;
1824
1825 nfs4_lock_state();
1826
1827 dprintk("NFSD: laundromat service - starting\n");
1828 list_for_each_safe(pos, next, &client_lru) {
1829 clp = list_entry(pos, struct nfs4_client, cl_lru);
1830 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1831 t = clp->cl_time - cutoff;
1832 if (clientid_val > t)
1833 clientid_val = t;
1834 break;
1835 }
1836 dprintk("NFSD: purging unused client (clientid %08x)\n",
1837 clp->cl_clientid.cl_id);
1838 expire_client(clp);
1839 }
1840 INIT_LIST_HEAD(&reaplist);
1841 spin_lock(&recall_lock);
1842 list_for_each_safe(pos, next, &del_recall_lru) {
1843 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1844 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1845 u = dp->dl_time - cutoff;
1846 if (test_val > u)
1847 test_val = u;
1848 break;
1849 }
1850 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1851 dp, dp->dl_flock);
1852 list_move(&dp->dl_recall_lru, &reaplist);
1853 }
1854 spin_unlock(&recall_lock);
1855 list_for_each_safe(pos, next, &reaplist) {
1856 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1857 list_del_init(&dp->dl_recall_lru);
1858 unhash_delegation(dp);
1859 }
1860 test_val = NFSD_LEASE_TIME;
1861 list_for_each_safe(pos, next, &close_lru) {
1862 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1863 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1864 u = sop->so_time - cutoff;
1865 if (test_val > u)
1866 test_val = u;
1867 break;
1868 }
1869 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1870 sop->so_id);
1871 list_del(&sop->so_close_lru);
1872 nfs4_put_stateowner(sop);
1873 }
1874 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1875 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1876 nfs4_unlock_state();
1877 return clientid_val;
1878}
1879
1880void
1881laundromat_main(void *not_used)
1882{
1883 time_t t;
1884
1885 t = nfs4_laundromat();
1886 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
1887 schedule_delayed_work(&laundromat_work, t*HZ);
1888}
1889
1890/* search ownerid_hashtbl[] and close_lru for stateid owner
1891 * (stateid->si_stateownerid)
1892 */
1893struct nfs4_stateowner *
1894find_openstateowner_id(u32 st_id, int flags) {
1895 struct nfs4_stateowner *local = NULL;
1896
1897 dprintk("NFSD: find_openstateowner_id %d\n", st_id);
1898 if (flags & CLOSE_STATE) {
1899 list_for_each_entry(local, &close_lru, so_close_lru) {
1900 if (local->so_id == st_id)
1901 return local;
1902 }
1903 }
1904 return NULL;
1905}
1906
1907static inline int
1908nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1909{
1910 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
1911}
1912
1913static int
1914STALE_STATEID(stateid_t *stateid)
1915{
1916 if (stateid->si_boot == boot_time)
1917 return 0;
1918 printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1919 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1920 stateid->si_generation);
1921 return 1;
1922}
1923
1924static inline int
1925access_permit_read(unsigned long access_bmap)
1926{
1927 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1928 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1929 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1930}
1931
1932static inline int
1933access_permit_write(unsigned long access_bmap)
1934{
1935 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1936 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1937}
1938
1939static
1940int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1941{
1942 int status = nfserr_openmode;
1943
1944 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
1945 goto out;
1946 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
1947 goto out;
1948 status = nfs_ok;
1949out:
1950 return status;
1951}
1952
1953static inline int
1954nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1955{
1956 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1957 return nfserr_openmode;
1958 else
1959 return nfs_ok;
1960}
1961
1962static inline int
1963check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
1964{
1965 /* Trying to call delegreturn with a special stateid? Yuch: */
1966 if (!(flags & (RD_STATE | WR_STATE)))
1967 return nfserr_bad_stateid;
1968 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
1969 return nfs_ok;
1970 else if (nfs4_in_grace()) {
1971 /* Answer in remaining cases depends on existance of
1972 * conflicting state; so we must wait out the grace period. */
1973 return nfserr_grace;
1974 } else if (flags & WR_STATE)
1975 return nfs4_share_conflict(current_fh,
1976 NFS4_SHARE_DENY_WRITE);
1977 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
1978 return nfs4_share_conflict(current_fh,
1979 NFS4_SHARE_DENY_READ);
1980}
1981
1982/*
1983 * Allow READ/WRITE during grace period on recovered state only for files
1984 * that are not able to provide mandatory locking.
1985 */
1986static inline int
1987io_during_grace_disallowed(struct inode *inode, int flags)
1988{
1989 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
1990 && MANDATORY_LOCK(inode);
1991}
1992
1993/*
1994* Checks for stateid operations
1995*/
1996int
1997nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
1998{
1999 struct nfs4_stateid *stp = NULL;
2000 struct nfs4_delegation *dp = NULL;
2001 stateid_t *stidp;
2002 struct inode *ino = current_fh->fh_dentry->d_inode;
2003 int status;
2004
2005 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2006 stateid->si_boot, stateid->si_stateownerid,
2007 stateid->si_fileid, stateid->si_generation);
2008 if (filpp)
2009 *filpp = NULL;
2010
2011 if (io_during_grace_disallowed(ino, flags))
2012 return nfserr_grace;
2013
2014 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2015 return check_special_stateids(current_fh, stateid, flags);
2016
2017 /* STALE STATEID */
2018 status = nfserr_stale_stateid;
2019 if (STALE_STATEID(stateid))
2020 goto out;
2021
2022 /* BAD STATEID */
2023 status = nfserr_bad_stateid;
2024 if (!stateid->si_fileid) { /* delegation stateid */
2025 if(!(dp = find_delegation_stateid(ino, stateid))) {
2026 dprintk("NFSD: delegation stateid not found\n");
2027 if (nfs4_in_grace())
2028 status = nfserr_grace;
2029 goto out;
2030 }
2031 stidp = &dp->dl_stateid;
2032 } else { /* open or lock stateid */
2033 if (!(stp = find_stateid(stateid, flags))) {
2034 dprintk("NFSD: open or lock stateid not found\n");
2035 if (nfs4_in_grace())
2036 status = nfserr_grace;
2037 goto out;
2038 }
2039 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2040 goto out;
2041 if (!stp->st_stateowner->so_confirmed)
2042 goto out;
2043 stidp = &stp->st_stateid;
2044 }
2045 if (stateid->si_generation > stidp->si_generation)
2046 goto out;
2047
2048 /* OLD STATEID */
2049 status = nfserr_old_stateid;
2050 if (stateid->si_generation < stidp->si_generation)
2051 goto out;
2052 if (stp) {
2053 if ((status = nfs4_check_openmode(stp,flags)))
2054 goto out;
2055 renew_client(stp->st_stateowner->so_client);
2056 if (filpp)
2057 *filpp = stp->st_vfs_file;
2058 } else if (dp) {
2059 if ((status = nfs4_check_delegmode(dp, flags)))
2060 goto out;
2061 renew_client(dp->dl_client);
2062 if (flags & DELEG_RET)
2063 unhash_delegation(dp);
2064 if (filpp)
2065 *filpp = dp->dl_vfs_file;
2066 }
2067 status = nfs_ok;
2068out:
2069 return status;
2070}
2071
2072
2073/*
2074 * Checks for sequence id mutating operations.
2075 */
2076int
2077nfs4_preprocess_seqid_op(struct svc_fh *current_fh, u32 seqid, stateid_t *stateid, int flags, struct nfs4_stateowner **sopp, struct nfs4_stateid **stpp, clientid_t *lockclid)
2078{
2079 int status;
2080 struct nfs4_stateid *stp;
2081 struct nfs4_stateowner *sop;
2082
2083 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2084 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2085 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2086 stateid->si_generation);
2087
2088 *stpp = NULL;
2089 *sopp = NULL;
2090
2091 status = nfserr_bad_stateid;
2092 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2093 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2094 goto out;
2095 }
2096
2097 status = nfserr_stale_stateid;
2098 if (STALE_STATEID(stateid))
2099 goto out;
2100 /*
2101 * We return BAD_STATEID if filehandle doesn't match stateid,
2102 * the confirmed flag is incorrecly set, or the generation
2103 * number is incorrect.
2104 * If there is no entry in the openfile table for this id,
2105 * we can't always return BAD_STATEID;
2106 * this might be a retransmitted CLOSE which has arrived after
2107 * the openfile has been released.
2108 */
2109 if (!(stp = find_stateid(stateid, flags)))
2110 goto no_nfs4_stateid;
2111
2112 status = nfserr_bad_stateid;
2113
2114 /* for new lock stateowners:
2115 * check that the lock->v.new.open_stateid
2116 * refers to an open stateowner
2117 *
2118 * check that the lockclid (nfs4_lock->v.new.clientid) is the same
2119 * as the open_stateid->st_stateowner->so_client->clientid
2120 */
2121 if (lockclid) {
2122 struct nfs4_stateowner *sop = stp->st_stateowner;
2123 struct nfs4_client *clp = sop->so_client;
2124
2125 if (!sop->so_is_open_owner)
2126 goto out;
2127 if (!cmp_clid(&clp->cl_clientid, lockclid))
2128 goto out;
2129 }
2130
2131 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2132 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2133 goto out;
2134 }
2135
2136 *stpp = stp;
2137 *sopp = sop = stp->st_stateowner;
2138
2139 /*
2140 * We now validate the seqid and stateid generation numbers.
2141 * For the moment, we ignore the possibility of
2142 * generation number wraparound.
2143 */
2144 if (seqid != sop->so_seqid + 1)
2145 goto check_replay;
2146
2147 if (sop->so_confirmed) {
2148 if (flags & CONFIRM) {
2149 printk("NFSD: preprocess_seqid_op: expected unconfirmed stateowner!\n");
2150 goto out;
2151 }
2152 }
2153 else {
2154 if (!(flags & CONFIRM)) {
2155 printk("NFSD: preprocess_seqid_op: stateowner not confirmed yet!\n");
2156 goto out;
2157 }
2158 }
2159 if (stateid->si_generation > stp->st_stateid.si_generation) {
2160 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2161 goto out;
2162 }
2163
2164 status = nfserr_old_stateid;
2165 if (stateid->si_generation < stp->st_stateid.si_generation) {
2166 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2167 goto out;
2168 }
2169 /* XXX renew the client lease here */
2170 status = nfs_ok;
2171
2172out:
2173 return status;
2174
2175no_nfs4_stateid:
2176
2177 /*
2178 * We determine whether this is a bad stateid or a replay,
2179 * starting by trying to look up the stateowner.
2180 * If stateowner is not found - stateid is bad.
2181 */
2182 if (!(sop = find_openstateowner_id(stateid->si_stateownerid, flags))) {
2183 printk("NFSD: preprocess_seqid_op: no stateowner or nfs4_stateid!\n");
2184 status = nfserr_bad_stateid;
2185 goto out;
2186 }
2187 *sopp = sop;
2188
2189check_replay:
2190 if (seqid == sop->so_seqid) {
2191 printk("NFSD: preprocess_seqid_op: retransmission?\n");
2192 /* indicate replay to calling function */
2193 status = NFSERR_REPLAY_ME;
2194 } else {
2195 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d\n", sop->so_seqid +1, seqid);
2196
2197 *sopp = NULL;
2198 status = nfserr_bad_seqid;
2199 }
2200 goto out;
2201}
2202
2203int
2204nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc)
2205{
2206 int status;
2207 struct nfs4_stateowner *sop;
2208 struct nfs4_stateid *stp;
2209
2210 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2211 (int)current_fh->fh_dentry->d_name.len,
2212 current_fh->fh_dentry->d_name.name);
2213
2214 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2215 goto out;
2216
2217 nfs4_lock_state();
2218
2219 if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2220 &oc->oc_req_stateid,
2221 CHECK_FH | CONFIRM | OPEN_STATE,
2222 &oc->oc_stateowner, &stp, NULL)))
2223 goto out;
2224
2225 sop = oc->oc_stateowner;
2226 sop->so_confirmed = 1;
2227 update_stateid(&stp->st_stateid);
2228 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2229 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2230 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2231 stp->st_stateid.si_boot,
2232 stp->st_stateid.si_stateownerid,
2233 stp->st_stateid.si_fileid,
2234 stp->st_stateid.si_generation);
2235out:
2236 if (oc->oc_stateowner)
2237 nfs4_get_stateowner(oc->oc_stateowner);
2238 nfs4_unlock_state();
2239 return status;
2240}
2241
2242
2243/*
2244 * unset all bits in union bitmap (bmap) that
2245 * do not exist in share (from successful OPEN_DOWNGRADE)
2246 */
2247static void
2248reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2249{
2250 int i;
2251 for (i = 1; i < 4; i++) {
2252 if ((i & access) != i)
2253 __clear_bit(i, bmap);
2254 }
2255}
2256
2257static void
2258reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2259{
2260 int i;
2261 for (i = 0; i < 4; i++) {
2262 if ((i & deny) != i)
2263 __clear_bit(i, bmap);
2264 }
2265}
2266
2267int
2268nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od)
2269{
2270 int status;
2271 struct nfs4_stateid *stp;
2272 unsigned int share_access;
2273
2274 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2275 (int)current_fh->fh_dentry->d_name.len,
2276 current_fh->fh_dentry->d_name.name);
2277
2278 if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2279 return nfserr_inval;
2280
2281 nfs4_lock_state();
2282 if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid,
2283 &od->od_stateid,
2284 CHECK_FH | OPEN_STATE,
2285 &od->od_stateowner, &stp, NULL)))
2286 goto out;
2287
2288 status = nfserr_inval;
2289 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2290 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2291 stp->st_access_bmap, od->od_share_access);
2292 goto out;
2293 }
2294 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2295 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2296 stp->st_deny_bmap, od->od_share_deny);
2297 goto out;
2298 }
2299 set_access(&share_access, stp->st_access_bmap);
2300 nfs4_file_downgrade(stp->st_vfs_file,
2301 share_access & ~od->od_share_access);
2302
2303 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2304 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2305
2306 update_stateid(&stp->st_stateid);
2307 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2308 status = nfs_ok;
2309out:
2310 if (od->od_stateowner)
2311 nfs4_get_stateowner(od->od_stateowner);
2312 nfs4_unlock_state();
2313 return status;
2314}
2315
2316/*
2317 * nfs4_unlock_state() called after encode
2318 */
2319int
2320nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close)
2321{
2322 int status;
2323 struct nfs4_stateid *stp;
2324
2325 dprintk("NFSD: nfsd4_close on file %.*s\n",
2326 (int)current_fh->fh_dentry->d_name.len,
2327 current_fh->fh_dentry->d_name.name);
2328
2329 nfs4_lock_state();
2330 /* check close_lru for replay */
2331 if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid,
2332 &close->cl_stateid,
2333 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2334 &close->cl_stateowner, &stp, NULL)))
2335 goto out;
2336 /*
2337 * Return success, but first update the stateid.
2338 */
2339 status = nfs_ok;
2340 update_stateid(&stp->st_stateid);
2341 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2342
2343 /* release_state_owner() calls nfsd_close() if needed */
2344 release_state_owner(stp, OPEN_STATE);
2345out:
2346 if (close->cl_stateowner)
2347 nfs4_get_stateowner(close->cl_stateowner);
2348 nfs4_unlock_state();
2349 return status;
2350}
2351
2352int
2353nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2354{
2355 int status;
2356
2357 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2358 goto out;
2359
2360 nfs4_lock_state();
2361 status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2362 nfs4_unlock_state();
2363out:
2364 return status;
2365}
2366
2367
2368/*
2369 * Lock owner state (byte-range locks)
2370 */
2371#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2372#define LOCK_HASH_BITS 8
2373#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2374#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2375
2376#define lockownerid_hashval(id) \
2377 ((id) & LOCK_HASH_MASK)
2378
2379static inline unsigned int
2380lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2381 struct xdr_netobj *ownername)
2382{
2383 return (file_hashval(inode) + cl_id
2384 + opaque_hashval(ownername->data, ownername->len))
2385 & LOCK_HASH_MASK;
2386}
2387
2388static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2389static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2390static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2391
2392struct nfs4_stateid *
2393find_stateid(stateid_t *stid, int flags)
2394{
2395 struct nfs4_stateid *local = NULL;
2396 u32 st_id = stid->si_stateownerid;
2397 u32 f_id = stid->si_fileid;
2398 unsigned int hashval;
2399
2400 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2401 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2402 hashval = stateid_hashval(st_id, f_id);
2403 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2404 if ((local->st_stateid.si_stateownerid == st_id) &&
2405 (local->st_stateid.si_fileid == f_id))
2406 return local;
2407 }
2408 }
2409 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2410 hashval = stateid_hashval(st_id, f_id);
2411 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2412 if ((local->st_stateid.si_stateownerid == st_id) &&
2413 (local->st_stateid.si_fileid == f_id))
2414 return local;
2415 }
2416 } else
2417 printk("NFSD: find_stateid: ERROR: no state flag\n");
2418 return NULL;
2419}
2420
2421static struct nfs4_delegation *
2422find_delegation_stateid(struct inode *ino, stateid_t *stid)
2423{
2424 struct nfs4_delegation *dp = NULL;
2425 struct nfs4_file *fp = NULL;
2426 u32 st_id;
2427
2428 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2429 stid->si_boot, stid->si_stateownerid,
2430 stid->si_fileid, stid->si_generation);
2431
2432 st_id = stid->si_stateownerid;
2433 fp = find_file(ino);
2434 if (fp) {
2435 list_for_each_entry(dp, &fp->fi_del_perfile, dl_del_perfile) {
2436 if(dp->dl_stateid.si_stateownerid == st_id) {
2437 dprintk("NFSD: find_delegation dp %p\n",dp);
2438 return dp;
2439 }
2440 }
2441 }
2442 return NULL;
2443}
2444
2445/*
2446 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2447 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2448 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2449 * locking, this prevents us from being completely protocol-compliant. The
2450 * real solution to this problem is to start using unsigned file offsets in
2451 * the VFS, but this is a very deep change!
2452 */
2453static inline void
2454nfs4_transform_lock_offset(struct file_lock *lock)
2455{
2456 if (lock->fl_start < 0)
2457 lock->fl_start = OFFSET_MAX;
2458 if (lock->fl_end < 0)
2459 lock->fl_end = OFFSET_MAX;
2460}
2461
2462int
2463nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2464{
2465 struct nfs4_stateowner *local = NULL;
2466 int status = 0;
2467
2468 if (hashval >= LOCK_HASH_SIZE)
2469 goto out;
2470 list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2471 if (local == sop) {
2472 status = 1;
2473 goto out;
2474 }
2475 }
2476out:
2477 return status;
2478}
2479
2480
2481static inline void
2482nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2483{
2484 struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2485 unsigned int hval = lockownerid_hashval(sop->so_id);
2486
2487 deny->ld_sop = NULL;
2488 if (nfs4_verify_lock_stateowner(sop, hval)) {
2489 kref_get(&sop->so_ref);
2490 deny->ld_sop = sop;
2491 deny->ld_clientid = sop->so_client->cl_clientid;
2492 }
2493 deny->ld_start = fl->fl_start;
2494 deny->ld_length = ~(u64)0;
2495 if (fl->fl_end != ~(u64)0)
2496 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2497 deny->ld_type = NFS4_READ_LT;
2498 if (fl->fl_type != F_RDLCK)
2499 deny->ld_type = NFS4_WRITE_LT;
2500}
2501
2502static struct nfs4_stateowner *
2503find_lockstateowner(struct xdr_netobj *owner, clientid_t *clid)
2504{
2505 struct nfs4_stateowner *local = NULL;
2506 int i;
2507
2508 for (i = 0; i < LOCK_HASH_SIZE; i++) {
2509 list_for_each_entry(local, &lock_ownerid_hashtbl[i], so_idhash) {
2510 if (!cmp_owner_str(local, owner, clid))
2511 continue;
2512 return local;
2513 }
2514 }
2515 return NULL;
2516}
2517
2518static struct nfs4_stateowner *
2519find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2520 struct xdr_netobj *owner)
2521{
2522 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2523 struct nfs4_stateowner *op;
2524
2525 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2526 if (cmp_owner_str(op, owner, clid))
2527 return op;
2528 }
2529 return NULL;
2530}
2531
2532/*
2533 * Alloc a lock owner structure.
2534 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2535 * occured.
2536 *
2537 * strhashval = lock_ownerstr_hashval
2538 * so_seqid = lock->lk_new_lock_seqid - 1: it gets bumped in encode
2539 */
2540
2541static struct nfs4_stateowner *
2542alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2543 struct nfs4_stateowner *sop;
2544 struct nfs4_replay *rp;
2545 unsigned int idhashval;
2546
2547 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2548 return NULL;
2549 idhashval = lockownerid_hashval(current_ownerid);
2550 INIT_LIST_HEAD(&sop->so_idhash);
2551 INIT_LIST_HEAD(&sop->so_strhash);
2552 INIT_LIST_HEAD(&sop->so_perclient);
2553 INIT_LIST_HEAD(&sop->so_perfilestate);
2554 INIT_LIST_HEAD(&sop->so_perlockowner);
2555 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2556 sop->so_time = 0;
2557 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2558 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2559 list_add(&sop->so_perlockowner, &open_stp->st_perlockowner);
2560 sop->so_is_open_owner = 0;
2561 sop->so_id = current_ownerid++;
2562 sop->so_client = clp;
2563 sop->so_seqid = lock->lk_new_lock_seqid - 1;
2564 sop->so_confirmed = 1;
2565 rp = &sop->so_replay;
2566 rp->rp_status = NFSERR_SERVERFAULT;
2567 rp->rp_buflen = 0;
2568 rp->rp_buf = rp->rp_ibuf;
2569 return sop;
2570}
2571
2572struct nfs4_stateid *
2573alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2574{
2575 struct nfs4_stateid *stp;
2576 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2577
2578 if ((stp = kmalloc(sizeof(struct nfs4_stateid),
2579 GFP_KERNEL)) == NULL)
2580 goto out;
2581 INIT_LIST_HEAD(&stp->st_hash);
2582 INIT_LIST_HEAD(&stp->st_perfile);
2583 INIT_LIST_HEAD(&stp->st_perfilestate);
2584 INIT_LIST_HEAD(&stp->st_perlockowner); /* not used */
2585 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2586 list_add(&stp->st_perfile, &fp->fi_perfile);
2587 list_add_perfile++;
2588 list_add(&stp->st_perfilestate, &sop->so_perfilestate);
2589 stp->st_stateowner = sop;
2590 stp->st_file = fp;
2591 stp->st_stateid.si_boot = boot_time;
2592 stp->st_stateid.si_stateownerid = sop->so_id;
2593 stp->st_stateid.si_fileid = fp->fi_id;
2594 stp->st_stateid.si_generation = 0;
2595 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2596 stp->st_access_bmap = open_stp->st_access_bmap;
2597 stp->st_deny_bmap = open_stp->st_deny_bmap;
2598
2599out:
2600 return stp;
2601}
2602
2603int
2604check_lock_length(u64 offset, u64 length)
2605{
2606 return ((length == 0) || ((length != ~(u64)0) &&
2607 LOFF_OVERFLOW(offset, length)));
2608}
2609
2610/*
2611 * LOCK operation
2612 */
2613int
2614nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock)
2615{
2616 struct nfs4_stateowner *lock_sop = NULL, *open_sop = NULL;
2617 struct nfs4_stateid *lock_stp;
2618 struct file *filp;
2619 struct file_lock file_lock;
2620 struct file_lock *conflock;
2621 int status = 0;
2622 unsigned int strhashval;
2623
2624 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2625 (long long) lock->lk_offset,
2626 (long long) lock->lk_length);
2627
2628 if (nfs4_in_grace() && !lock->lk_reclaim)
2629 return nfserr_grace;
2630 if (!nfs4_in_grace() && lock->lk_reclaim)
2631 return nfserr_no_grace;
2632
2633 if (check_lock_length(lock->lk_offset, lock->lk_length))
2634 return nfserr_inval;
2635
2636 nfs4_lock_state();
2637
2638 if (lock->lk_is_new) {
2639 /*
2640 * Client indicates that this is a new lockowner.
2641 * Use open owner and open stateid to create lock owner and lock
2642 * stateid.
2643 */
2644 struct nfs4_stateid *open_stp = NULL;
2645 struct nfs4_file *fp;
2646
2647 status = nfserr_stale_clientid;
2648 if (STALE_CLIENTID(&lock->lk_new_clientid)) {
2649 printk("NFSD: nfsd4_lock: clientid is stale!\n");
2650 goto out;
2651 }
2652
2653 /* is the new lock seqid presented by the client zero? */
2654 status = nfserr_bad_seqid;
2655 if (lock->v.new.lock_seqid != 0)
2656 goto out;
2657
2658 /* validate and update open stateid and open seqid */
2659 status = nfs4_preprocess_seqid_op(current_fh,
2660 lock->lk_new_open_seqid,
2661 &lock->lk_new_open_stateid,
2662 CHECK_FH | OPEN_STATE,
2663 &open_sop, &open_stp,
2664 &lock->v.new.clientid);
2665 if (status) {
2666 if (lock->lk_reclaim)
2667 status = nfserr_reclaim_bad;
2668 goto out;
2669 }
2670 /* create lockowner and lock stateid */
2671 fp = open_stp->st_file;
2672 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2673 open_sop->so_client->cl_clientid.cl_id,
2674 &lock->v.new.owner);
2675 /*
2676 * If we already have this lock owner, the client is in
2677 * error (or our bookeeping is wrong!)
2678 * for asking for a 'new lock'.
2679 */
2680 status = nfserr_bad_stateid;
2681 lock_sop = find_lockstateowner(&lock->v.new.owner,
2682 &lock->v.new.clientid);
2683 if (lock_sop)
2684 goto out;
2685 status = nfserr_resource;
2686 if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
2687 goto out;
2688 if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner,
2689 fp, open_stp)) == NULL) {
2690 release_stateowner(lock->lk_stateowner);
2691 lock->lk_stateowner = NULL;
2692 goto out;
2693 }
2694 /* bump the open seqid used to create the lock */
2695 open_sop->so_seqid++;
2696 } else {
2697 /* lock (lock owner + lock stateid) already exists */
2698 status = nfs4_preprocess_seqid_op(current_fh,
2699 lock->lk_old_lock_seqid,
2700 &lock->lk_old_lock_stateid,
2701 CHECK_FH | LOCK_STATE,
2702 &lock->lk_stateowner, &lock_stp, NULL);
2703 if (status)
2704 goto out;
2705 }
2706 /* lock->lk_stateowner and lock_stp have been created or found */
2707 filp = lock_stp->st_vfs_file;
2708
2709 if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2710 printk("NFSD: nfsd4_lock: permission denied!\n");
2711 goto out;
2712 }
2713
2714 locks_init_lock(&file_lock);
2715 switch (lock->lk_type) {
2716 case NFS4_READ_LT:
2717 case NFS4_READW_LT:
2718 file_lock.fl_type = F_RDLCK;
2719 break;
2720 case NFS4_WRITE_LT:
2721 case NFS4_WRITEW_LT:
2722 file_lock.fl_type = F_WRLCK;
2723 break;
2724 default:
2725 status = nfserr_inval;
2726 goto out;
2727 }
2728 file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
2729 file_lock.fl_pid = current->tgid;
2730 file_lock.fl_file = filp;
2731 file_lock.fl_flags = FL_POSIX;
2732
2733 file_lock.fl_start = lock->lk_offset;
2734 if ((lock->lk_length == ~(u64)0) ||
2735 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2736 file_lock.fl_end = ~(u64)0;
2737 else
2738 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2739 nfs4_transform_lock_offset(&file_lock);
2740
2741 /*
2742 * Try to lock the file in the VFS.
2743 * Note: locks.c uses the BKL to protect the inode's lock list.
2744 */
2745
2746 status = posix_lock_file(filp, &file_lock);
2747 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2748 file_lock.fl_ops->fl_release_private(&file_lock);
2749 dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2750 switch (-status) {
2751 case 0: /* success! */
2752 update_stateid(&lock_stp->st_stateid);
2753 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2754 sizeof(stateid_t));
2755 goto out;
2756 case (EAGAIN):
2757 goto conflicting_lock;
2758 case (EDEADLK):
2759 status = nfserr_deadlock;
2760 default:
2761 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2762 goto out_destroy_new_stateid;
2763 }
2764
2765conflicting_lock:
2766 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2767 status = nfserr_denied;
2768 /* XXX There is a race here. Future patch needed to provide
2769 * an atomic posix_lock_and_test_file
2770 */
2771 if (!(conflock = posix_test_lock(filp, &file_lock))) {
2772 status = nfserr_serverfault;
2773 goto out;
2774 }
2775 nfs4_set_lock_denied(conflock, &lock->lk_denied);
2776
2777out_destroy_new_stateid:
2778 if (lock->lk_is_new) {
2779 dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
2780 /*
2781 * An error encountered after instantiation of the new
2782 * stateid has forced us to destroy it.
2783 */
2784 if (!seqid_mutating_err(status))
2785 open_sop->so_seqid--;
2786
2787 release_state_owner(lock_stp, LOCK_STATE);
2788 }
2789out:
2790 if (lock->lk_stateowner)
2791 nfs4_get_stateowner(lock->lk_stateowner);
2792 nfs4_unlock_state();
2793 return status;
2794}
2795
2796/*
2797 * LOCKT operation
2798 */
2799int
2800nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2801{
2802 struct inode *inode;
2803 struct file file;
2804 struct file_lock file_lock;
2805 struct file_lock *conflicting_lock;
2806 int status;
2807
2808 if (nfs4_in_grace())
2809 return nfserr_grace;
2810
2811 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2812 return nfserr_inval;
2813
2814 lockt->lt_stateowner = NULL;
2815 nfs4_lock_state();
2816
2817 status = nfserr_stale_clientid;
2818 if (STALE_CLIENTID(&lockt->lt_clientid)) {
2819 printk("NFSD: nfsd4_lockt: clientid is stale!\n");
2820 goto out;
2821 }
2822
2823 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2824 printk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2825 if (status == nfserr_symlink)
2826 status = nfserr_inval;
2827 goto out;
2828 }
2829
2830 inode = current_fh->fh_dentry->d_inode;
2831 locks_init_lock(&file_lock);
2832 switch (lockt->lt_type) {
2833 case NFS4_READ_LT:
2834 case NFS4_READW_LT:
2835 file_lock.fl_type = F_RDLCK;
2836 break;
2837 case NFS4_WRITE_LT:
2838 case NFS4_WRITEW_LT:
2839 file_lock.fl_type = F_WRLCK;
2840 break;
2841 default:
2842 printk("NFSD: nfs4_lockt: bad lock type!\n");
2843 status = nfserr_inval;
2844 goto out;
2845 }
2846
2847 lockt->lt_stateowner = find_lockstateowner_str(inode,
2848 &lockt->lt_clientid, &lockt->lt_owner);
2849 if (lockt->lt_stateowner)
2850 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2851 file_lock.fl_pid = current->tgid;
2852 file_lock.fl_flags = FL_POSIX;
2853
2854 file_lock.fl_start = lockt->lt_offset;
2855 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2856 file_lock.fl_end = ~(u64)0;
2857 else
2858 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2859
2860 nfs4_transform_lock_offset(&file_lock);
2861
2862 /* posix_test_lock uses the struct file _only_ to resolve the inode.
2863 * since LOCKT doesn't require an OPEN, and therefore a struct
2864 * file may not exist, pass posix_test_lock a struct file with
2865 * only the dentry:inode set.
2866 */
2867 memset(&file, 0, sizeof (struct file));
2868 file.f_dentry = current_fh->fh_dentry;
2869
2870 status = nfs_ok;
2871 conflicting_lock = posix_test_lock(&file, &file_lock);
2872 if (conflicting_lock) {
2873 status = nfserr_denied;
2874 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2875 }
2876out:
2877 nfs4_unlock_state();
2878 return status;
2879}
2880
2881int
2882nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku)
2883{
2884 struct nfs4_stateid *stp;
2885 struct file *filp = NULL;
2886 struct file_lock file_lock;
2887 int status;
2888
2889 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2890 (long long) locku->lu_offset,
2891 (long long) locku->lu_length);
2892
2893 if (check_lock_length(locku->lu_offset, locku->lu_length))
2894 return nfserr_inval;
2895
2896 nfs4_lock_state();
2897
2898 if ((status = nfs4_preprocess_seqid_op(current_fh,
2899 locku->lu_seqid,
2900 &locku->lu_stateid,
2901 CHECK_FH | LOCK_STATE,
2902 &locku->lu_stateowner, &stp, NULL)))
2903 goto out;
2904
2905 filp = stp->st_vfs_file;
2906 BUG_ON(!filp);
2907 locks_init_lock(&file_lock);
2908 file_lock.fl_type = F_UNLCK;
2909 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2910 file_lock.fl_pid = current->tgid;
2911 file_lock.fl_file = filp;
2912 file_lock.fl_flags = FL_POSIX;
2913 file_lock.fl_start = locku->lu_offset;
2914
2915 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2916 file_lock.fl_end = ~(u64)0;
2917 else
2918 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2919 nfs4_transform_lock_offset(&file_lock);
2920
2921 /*
2922 * Try to unlock the file in the VFS.
2923 */
2924 status = posix_lock_file(filp, &file_lock);
2925 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2926 file_lock.fl_ops->fl_release_private(&file_lock);
2927 if (status) {
2928 printk("NFSD: nfs4_locku: posix_lock_file failed!\n");
2929 goto out_nfserr;
2930 }
2931 /*
2932 * OK, unlock succeeded; the only thing left to do is update the stateid.
2933 */
2934 update_stateid(&stp->st_stateid);
2935 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2936
2937out:
2938 if (locku->lu_stateowner)
2939 nfs4_get_stateowner(locku->lu_stateowner);
2940 nfs4_unlock_state();
2941 return status;
2942
2943out_nfserr:
2944 status = nfserrno(status);
2945 goto out;
2946}
2947
2948/*
2949 * returns
2950 * 1: locks held by lockowner
2951 * 0: no locks held by lockowner
2952 */
2953static int
2954check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2955{
2956 struct file_lock **flpp;
2957 struct inode *inode = filp->f_dentry->d_inode;
2958 int status = 0;
2959
2960 lock_kernel();
2961 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
2962 if ((*flpp)->fl_owner == (fl_owner_t)lowner)
2963 status = 1;
2964 goto out;
2965 }
2966out:
2967 unlock_kernel();
2968 return status;
2969}
2970
2971int
2972nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
2973{
2974 clientid_t *clid = &rlockowner->rl_clientid;
2975 struct nfs4_stateowner *local = NULL;
2976 struct xdr_netobj *owner = &rlockowner->rl_owner;
2977 int status;
2978
2979 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
2980 clid->cl_boot, clid->cl_id);
2981
2982 /* XXX check for lease expiration */
2983
2984 status = nfserr_stale_clientid;
2985 if (STALE_CLIENTID(clid)) {
2986 printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n");
2987 return status;
2988 }
2989
2990 nfs4_lock_state();
2991
2992 status = nfs_ok;
2993 local = find_lockstateowner(owner, clid);
2994 if (local) {
2995 struct nfs4_stateid *stp;
2996
2997 /* check for any locks held by any stateid
2998 * associated with the (lock) stateowner */
2999 status = nfserr_locks_held;
3000 list_for_each_entry(stp, &local->so_perfilestate,
3001 st_perfilestate) {
3002 if (check_for_locks(stp->st_vfs_file, local))
3003 goto out;
3004 }
3005 /* no locks held by (lock) stateowner */
3006 status = nfs_ok;
3007 release_stateowner(local);
3008 }
3009out:
3010 nfs4_unlock_state();
3011 return status;
3012}
3013
3014static inline struct nfs4_client_reclaim *
3015alloc_reclaim(int namelen)
3016{
3017 struct nfs4_client_reclaim *crp = NULL;
3018
3019 crp = kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
3020 if (!crp)
3021 return NULL;
3022 crp->cr_name.data = kmalloc(namelen, GFP_KERNEL);
3023 if (!crp->cr_name.data) {
3024 kfree(crp);
3025 return NULL;
3026 }
3027 return crp;
3028}
3029
3030/*
3031 * failure => all reset bets are off, nfserr_no_grace...
3032 */
3033static int
3034nfs4_client_to_reclaim(char *name, int namlen)
3035{
3036 unsigned int strhashval;
3037 struct nfs4_client_reclaim *crp = NULL;
3038
3039 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", namlen, name);
3040 crp = alloc_reclaim(namlen);
3041 if (!crp)
3042 return 0;
3043 strhashval = clientstr_hashval(name, namlen);
3044 INIT_LIST_HEAD(&crp->cr_strhash);
3045 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3046 memcpy(crp->cr_name.data, name, namlen);
3047 crp->cr_name.len = namlen;
3048 reclaim_str_hashtbl_size++;
3049 return 1;
3050}
3051
3052static void
3053nfs4_release_reclaim(void)
3054{
3055 struct nfs4_client_reclaim *crp = NULL;
3056 int i;
3057
3058 BUG_ON(!nfs4_reclaim_init);
3059 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3060 while (!list_empty(&reclaim_str_hashtbl[i])) {
3061 crp = list_entry(reclaim_str_hashtbl[i].next,
3062 struct nfs4_client_reclaim, cr_strhash);
3063 list_del(&crp->cr_strhash);
3064 kfree(crp->cr_name.data);
3065 kfree(crp);
3066 reclaim_str_hashtbl_size--;
3067 }
3068 }
3069 BUG_ON(reclaim_str_hashtbl_size);
3070}
3071
3072/*
3073 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3074struct nfs4_client_reclaim *
3075nfs4_find_reclaim_client(clientid_t *clid)
3076{
3077 unsigned int strhashval;
3078 struct nfs4_client *clp;
3079 struct nfs4_client_reclaim *crp = NULL;
3080
3081
3082 /* find clientid in conf_id_hashtbl */
3083 clp = find_confirmed_client(clid);
3084 if (clp == NULL)
3085 return NULL;
3086
3087 dprintk("NFSD: nfs4_find_reclaim_client for %.*s\n",
3088 clp->cl_name.len, clp->cl_name.data);
3089
3090 /* find clp->cl_name in reclaim_str_hashtbl */
3091 strhashval = clientstr_hashval(clp->cl_name.data, clp->cl_name.len);
3092 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3093 if (cmp_name(&crp->cr_name, &clp->cl_name)) {
3094 return crp;
3095 }
3096 }
3097 return NULL;
3098}
3099
3100/*
3101* Called from OPEN. Look for clientid in reclaim list.
3102*/
3103int
3104nfs4_check_open_reclaim(clientid_t *clid)
3105{
3106 struct nfs4_client_reclaim *crp;
3107
3108 if ((crp = nfs4_find_reclaim_client(clid)) == NULL)
3109 return nfserr_reclaim_bad;
3110 return nfs_ok;
3111}
3112
3113
3114/*
3115 * Start and stop routines
3116 */
3117
3118static void
3119__nfs4_state_init(void)
3120{
3121 int i;
3122 time_t grace_time;
3123
3124 if (!nfs4_reclaim_init) {
3125 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3126 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3127 reclaim_str_hashtbl_size = 0;
3128 nfs4_reclaim_init = 1;
3129 }
3130 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3131 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3132 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3133 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3134 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3135 }
3136 for (i = 0; i < FILE_HASH_SIZE; i++) {
3137 INIT_LIST_HEAD(&file_hashtbl[i]);
3138 }
3139 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3140 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3141 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3142 }
3143 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3144 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3145 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3146 }
3147 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3148 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3149 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3150 }
3151 memset(&zerostateid, 0, sizeof(stateid_t));
3152 memset(&onestateid, ~0, sizeof(stateid_t));
3153
3154 INIT_LIST_HEAD(&close_lru);
3155 INIT_LIST_HEAD(&client_lru);
3156 INIT_LIST_HEAD(&del_recall_lru);
3157 spin_lock_init(&recall_lock);
3158 boot_time = get_seconds();
3159 grace_time = max(old_lease_time, lease_time);
3160 if (reclaim_str_hashtbl_size == 0)
3161 grace_time = 0;
3162 if (grace_time)
3163 printk("NFSD: starting %ld-second grace period\n", grace_time);
3164 grace_end = boot_time + grace_time;
3165 INIT_WORK(&laundromat_work,laundromat_main, NULL);
3166 schedule_delayed_work(&laundromat_work, NFSD_LEASE_TIME*HZ);
3167}
3168
3169int
3170nfs4_state_init(void)
3171{
3172 int status;
3173
3174 if (nfs4_init)
3175 return 0;
3176 status = nfsd4_init_slabs();
3177 if (status)
3178 return status;
3179 __nfs4_state_init();
3180 nfs4_init = 1;
3181 return 0;
3182}
3183
3184int
3185nfs4_in_grace(void)
3186{
3187 return get_seconds() < grace_end;
3188}
3189
3190void
3191set_no_grace(void)
3192{
3193 printk("NFSD: ERROR in reboot recovery. State reclaims will fail.\n");
3194 grace_end = get_seconds();
3195}
3196
3197time_t
3198nfs4_lease_time(void)
3199{
3200 return lease_time;
3201}
3202
3203static void
3204__nfs4_state_shutdown(void)
3205{
3206 int i;
3207 struct nfs4_client *clp = NULL;
3208 struct nfs4_delegation *dp = NULL;
3209 struct nfs4_stateowner *sop = NULL;
3210 struct list_head *pos, *next, reaplist;
3211
3212 list_for_each_safe(pos, next, &close_lru) {
3213 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3214 list_del(&sop->so_close_lru);
3215 nfs4_put_stateowner(sop);
3216 }
3217
3218 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3219 while (!list_empty(&conf_id_hashtbl[i])) {
3220 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3221 expire_client(clp);
3222 }
3223 while (!list_empty(&unconf_str_hashtbl[i])) {
3224 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3225 expire_client(clp);
3226 }
3227 }
3228 INIT_LIST_HEAD(&reaplist);
3229 spin_lock(&recall_lock);
3230 list_for_each_safe(pos, next, &del_recall_lru) {
3231 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3232 list_move(&dp->dl_recall_lru, &reaplist);
3233 }
3234 spin_unlock(&recall_lock);
3235 list_for_each_safe(pos, next, &reaplist) {
3236 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3237 list_del_init(&dp->dl_recall_lru);
3238 unhash_delegation(dp);
3239 }
3240
3241 release_all_files();
3242 cancel_delayed_work(&laundromat_work);
3243 flush_scheduled_work();
3244 nfs4_init = 0;
3245 dprintk("NFSD: list_add_perfile %d list_del_perfile %d\n",
3246 list_add_perfile, list_del_perfile);
3247 dprintk("NFSD: add_perclient %d del_perclient %d\n",
3248 add_perclient, del_perclient);
3249 dprintk("NFSD: alloc_file %d free_file %d\n",
3250 alloc_file, free_file);
3251 dprintk("NFSD: vfsopen %d vfsclose %d\n",
3252 vfsopen, vfsclose);
3253 dprintk("NFSD: alloc_delegation %d free_delegation %d\n",
3254 alloc_delegation, free_delegation);
3255
3256}
3257
3258void
3259nfs4_state_shutdown(void)
3260{
3261 nfs4_lock_state();
3262 nfs4_release_reclaim();
3263 __nfs4_state_shutdown();
3264 nfsd4_free_slabs();
3265 nfs4_unlock_state();
3266}
3267
3268/*
3269 * Called when leasetime is changed.
3270 *
3271 * if nfsd is not started, simply set the global lease.
3272 *
3273 * if nfsd(s) are running, lease change requires nfsv4 state to be reset.
3274 * e.g: boot_time is reset, existing nfs4_client structs are
3275 * used to fill reclaim_str_hashtbl, then all state (except for the
3276 * reclaim_str_hashtbl) is re-initialized.
3277 *
3278 * if the old lease time is greater than the new lease time, the grace
3279 * period needs to be set to the old lease time to allow clients to reclaim
3280 * their state. XXX - we may want to set the grace period == lease time
3281 * after an initial grace period == old lease time
3282 *
3283 * if an error occurs in this process, the new lease is set, but the server
3284 * will not honor OPEN or LOCK reclaims, and will return nfserr_no_grace
3285 * which means OPEN/LOCK/READ/WRITE will fail during grace period.
3286 *
3287 * clients will attempt to reset all state with SETCLIENTID/CONFIRM, and
3288 * OPEN and LOCK reclaims.
3289 */
3290void
3291nfs4_reset_lease(time_t leasetime)
3292{
3293 struct nfs4_client *clp;
3294 int i;
3295
3296 printk("NFSD: New leasetime %ld\n",leasetime);
3297 if (!nfs4_init)
3298 return;
3299 nfs4_lock_state();
3300 old_lease_time = lease_time;
3301 lease_time = leasetime;
3302
3303 nfs4_release_reclaim();
3304
3305 /* populate reclaim_str_hashtbl with current confirmed nfs4_clientid */
3306 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3307 list_for_each_entry(clp, &conf_id_hashtbl[i], cl_idhash) {
3308 if (!nfs4_client_to_reclaim(clp->cl_name.data,
3309 clp->cl_name.len)) {
3310 nfs4_release_reclaim();
3311 goto init_state;
3312 }
3313 }
3314 }
3315init_state:
3316 __nfs4_state_shutdown();
3317 __nfs4_state_init();
3318 nfs4_unlock_state();
3319}
3320
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-08 08:01:54 -0500