f60bcad77f7162a7fff41b2d422c5e15d8d82d00
[linux-2.6.git] / fs / nfsd / nfs4state.c
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 #include <linux/namei.h>
52
53 #define NFSDDBG_FACILITY                NFSDDBG_PROC
54
55 /* Globals */
56 static time_t lease_time = 90;     /* default lease time */
57 static time_t user_lease_time = 90;
58 static time_t boot_time;
59 static int in_grace = 1;
60 static u32 current_clientid = 1;
61 static u32 current_ownerid = 1;
62 static u32 current_fileid = 1;
63 static u32 current_delegid = 1;
64 static u32 nfs4_init;
65 static stateid_t zerostateid;             /* bits all 0 */
66 static stateid_t onestateid;              /* bits all 1 */
67
68 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
69 #define ONE_STATEID(stateid)  (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
70
71 /* forward declarations */
72 static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
73 static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
74 static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
75 static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
76 static void nfs4_set_recdir(char *recdir);
77
78 /* Locking:
79  *
80  * client_sema: 
81  *      protects clientid_hashtbl[], clientstr_hashtbl[],
82  *      unconfstr_hashtbl[], uncofid_hashtbl[].
83  */
84 static DECLARE_MUTEX(client_sema);
85
86 static kmem_cache_t *stateowner_slab = NULL;
87 static kmem_cache_t *file_slab = NULL;
88 static kmem_cache_t *stateid_slab = NULL;
89 static kmem_cache_t *deleg_slab = NULL;
90
91 void
92 nfs4_lock_state(void)
93 {
94         down(&client_sema);
95 }
96
97 void
98 nfs4_unlock_state(void)
99 {
100         up(&client_sema);
101 }
102
103 static inline u32
104 opaque_hashval(const void *ptr, int nbytes)
105 {
106         unsigned char *cptr = (unsigned char *) ptr;
107
108         u32 x = 0;
109         while (nbytes--) {
110                 x *= 37;
111                 x += *cptr++;
112         }
113         return x;
114 }
115
116 /* forward declarations */
117 static void release_stateowner(struct nfs4_stateowner *sop);
118 static void release_stateid(struct nfs4_stateid *stp, int flags);
119
120 /*
121  * Delegation state
122  */
123
124 /* recall_lock protects the del_recall_lru */
125 static spinlock_t recall_lock = SPIN_LOCK_UNLOCKED;
126 static struct list_head del_recall_lru;
127
128 static void
129 free_nfs4_file(struct kref *kref)
130 {
131         struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
132         list_del(&fp->fi_hash);
133         iput(fp->fi_inode);
134         kmem_cache_free(file_slab, fp);
135 }
136
137 static inline void
138 put_nfs4_file(struct nfs4_file *fi)
139 {
140         kref_put(&fi->fi_ref, free_nfs4_file);
141 }
142
143 static inline void
144 get_nfs4_file(struct nfs4_file *fi)
145 {
146         kref_get(&fi->fi_ref);
147 }
148
149 static struct nfs4_delegation *
150 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
151 {
152         struct nfs4_delegation *dp;
153         struct nfs4_file *fp = stp->st_file;
154         struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
155
156         dprintk("NFSD alloc_init_deleg\n");
157         dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
158         if (dp == NULL)
159                 return dp;
160         INIT_LIST_HEAD(&dp->dl_perfile);
161         INIT_LIST_HEAD(&dp->dl_perclnt);
162         INIT_LIST_HEAD(&dp->dl_recall_lru);
163         dp->dl_client = clp;
164         get_nfs4_file(fp);
165         dp->dl_file = fp;
166         dp->dl_flock = NULL;
167         get_file(stp->st_vfs_file);
168         dp->dl_vfs_file = stp->st_vfs_file;
169         dp->dl_type = type;
170         dp->dl_recall.cbr_dp = NULL;
171         dp->dl_recall.cbr_ident = cb->cb_ident;
172         dp->dl_recall.cbr_trunc = 0;
173         dp->dl_stateid.si_boot = boot_time;
174         dp->dl_stateid.si_stateownerid = current_delegid++;
175         dp->dl_stateid.si_fileid = 0;
176         dp->dl_stateid.si_generation = 0;
177         dp->dl_fhlen = current_fh->fh_handle.fh_size;
178         memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
179                         current_fh->fh_handle.fh_size);
180         dp->dl_time = 0;
181         atomic_set(&dp->dl_count, 1);
182         list_add(&dp->dl_perfile, &fp->fi_delegations);
183         list_add(&dp->dl_perclnt, &clp->cl_delegations);
184         return dp;
185 }
186
187 void
188 nfs4_put_delegation(struct nfs4_delegation *dp)
189 {
190         if (atomic_dec_and_test(&dp->dl_count)) {
191                 dprintk("NFSD: freeing dp %p\n",dp);
192                 put_nfs4_file(dp->dl_file);
193                 kmem_cache_free(deleg_slab, dp);
194         }
195 }
196
197 /* Remove the associated file_lock first, then remove the delegation.
198  * lease_modify() is called to remove the FS_LEASE file_lock from
199  * the i_flock list, eventually calling nfsd's lock_manager
200  * fl_release_callback.
201  */
202 static void
203 nfs4_close_delegation(struct nfs4_delegation *dp)
204 {
205         struct file *filp = dp->dl_vfs_file;
206
207         dprintk("NFSD: close_delegation dp %p\n",dp);
208         dp->dl_vfs_file = NULL;
209         /* The following nfsd_close may not actually close the file,
210          * but we want to remove the lease in any case. */
211         if (dp->dl_flock)
212                 setlease(filp, F_UNLCK, &dp->dl_flock);
213         nfsd_close(filp);
214 }
215
216 /* Called under the state lock. */
217 static void
218 unhash_delegation(struct nfs4_delegation *dp)
219 {
220         list_del_init(&dp->dl_perfile);
221         list_del_init(&dp->dl_perclnt);
222         spin_lock(&recall_lock);
223         list_del_init(&dp->dl_recall_lru);
224         spin_unlock(&recall_lock);
225         nfs4_close_delegation(dp);
226         nfs4_put_delegation(dp);
227 }
228
229 /* 
230  * SETCLIENTID state 
231  */
232
233 /* Hash tables for nfs4_clientid state */
234 #define CLIENT_HASH_BITS                 4
235 #define CLIENT_HASH_SIZE                (1 << CLIENT_HASH_BITS)
236 #define CLIENT_HASH_MASK                (CLIENT_HASH_SIZE - 1)
237
238 #define clientid_hashval(id) \
239         ((id) & CLIENT_HASH_MASK)
240 #define clientstr_hashval(name) \
241         (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
242 /*
243  * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
244  * used in reboot/reset lease grace period processing
245  *
246  * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
247  * setclientid_confirmed info. 
248  *
249  * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed 
250  * setclientid info.
251  *
252  * client_lru holds client queue ordered by nfs4_client.cl_time
253  * for lease renewal.
254  *
255  * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
256  * for last close replay.
257  */
258 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
259 static int reclaim_str_hashtbl_size = 0;
260 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
261 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
262 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
263 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
264 static struct list_head client_lru;
265 static struct list_head close_lru;
266
267 static inline void
268 renew_client(struct nfs4_client *clp)
269 {
270         /*
271         * Move client to the end to the LRU list.
272         */
273         dprintk("renewing client (clientid %08x/%08x)\n", 
274                         clp->cl_clientid.cl_boot, 
275                         clp->cl_clientid.cl_id);
276         list_move_tail(&clp->cl_lru, &client_lru);
277         clp->cl_time = get_seconds();
278 }
279
280 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
281 static int
282 STALE_CLIENTID(clientid_t *clid)
283 {
284         if (clid->cl_boot == boot_time)
285                 return 0;
286         dprintk("NFSD stale clientid (%08x/%08x)\n", 
287                         clid->cl_boot, clid->cl_id);
288         return 1;
289 }
290
291 /* 
292  * XXX Should we use a slab cache ?
293  * This type of memory management is somewhat inefficient, but we use it
294  * anyway since SETCLIENTID is not a common operation.
295  */
296 static inline struct nfs4_client *
297 alloc_client(struct xdr_netobj name)
298 {
299         struct nfs4_client *clp;
300
301         if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
302                 memset(clp, 0, sizeof(*clp));
303                 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
304                         memcpy(clp->cl_name.data, name.data, name.len);
305                         clp->cl_name.len = name.len;
306                 }
307                 else {
308                         kfree(clp);
309                         clp = NULL;
310                 }
311         }
312         return clp;
313 }
314
315 static inline void
316 free_client(struct nfs4_client *clp)
317 {
318         if (clp->cl_cred.cr_group_info)
319                 put_group_info(clp->cl_cred.cr_group_info);
320         kfree(clp->cl_name.data);
321         kfree(clp);
322 }
323
324 void
325 put_nfs4_client(struct nfs4_client *clp)
326 {
327         if (atomic_dec_and_test(&clp->cl_count))
328                 free_client(clp);
329 }
330
331 static void
332 expire_client(struct nfs4_client *clp)
333 {
334         struct nfs4_stateowner *sop;
335         struct nfs4_delegation *dp;
336         struct nfs4_callback *cb = &clp->cl_callback;
337         struct rpc_clnt *clnt = clp->cl_callback.cb_client;
338         struct list_head reaplist;
339
340         dprintk("NFSD: expire_client cl_count %d\n",
341                             atomic_read(&clp->cl_count));
342
343         /* shutdown rpc client, ending any outstanding recall rpcs */
344         if (atomic_read(&cb->cb_set) == 1 && clnt) {
345                 rpc_shutdown_client(clnt);
346                 clnt = clp->cl_callback.cb_client = NULL;
347         }
348
349         INIT_LIST_HEAD(&reaplist);
350         spin_lock(&recall_lock);
351         while (!list_empty(&clp->cl_delegations)) {
352                 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
353                 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
354                                 dp->dl_flock);
355                 list_del_init(&dp->dl_perclnt);
356                 list_move(&dp->dl_recall_lru, &reaplist);
357         }
358         spin_unlock(&recall_lock);
359         while (!list_empty(&reaplist)) {
360                 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
361                 list_del_init(&dp->dl_recall_lru);
362                 unhash_delegation(dp);
363         }
364         list_del(&clp->cl_idhash);
365         list_del(&clp->cl_strhash);
366         list_del(&clp->cl_lru);
367         while (!list_empty(&clp->cl_openowners)) {
368                 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
369                 release_stateowner(sop);
370         }
371         put_nfs4_client(clp);
372 }
373
374 static struct nfs4_client *
375 create_client(struct xdr_netobj name, char *recdir) {
376         struct nfs4_client *clp;
377
378         if (!(clp = alloc_client(name)))
379                 goto out;
380         memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
381         atomic_set(&clp->cl_count, 1);
382         atomic_set(&clp->cl_callback.cb_set, 0);
383         INIT_LIST_HEAD(&clp->cl_idhash);
384         INIT_LIST_HEAD(&clp->cl_strhash);
385         INIT_LIST_HEAD(&clp->cl_openowners);
386         INIT_LIST_HEAD(&clp->cl_delegations);
387         INIT_LIST_HEAD(&clp->cl_lru);
388 out:
389         return clp;
390 }
391
392 static void
393 copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
394         memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
395 }
396
397 static void
398 copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
399         target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; 
400         target->cl_clientid.cl_id = source->cl_clientid.cl_id; 
401 }
402
403 static void
404 copy_cred(struct svc_cred *target, struct svc_cred *source) {
405
406         target->cr_uid = source->cr_uid;
407         target->cr_gid = source->cr_gid;
408         target->cr_group_info = source->cr_group_info;
409         get_group_info(target->cr_group_info);
410 }
411
412 static inline int
413 same_name(const char *n1, const char *n2) {
414         return 0 == memcmp(n1, n2, HEXDIR_LEN);
415 }
416
417 static int
418 cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
419         return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
420 }
421
422 static int
423 cmp_clid(clientid_t * cl1, clientid_t * cl2) {
424         return((cl1->cl_boot == cl2->cl_boot) &&
425                 (cl1->cl_id == cl2->cl_id));
426 }
427
428 /* XXX what about NGROUP */
429 static int
430 cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
431         return(cr1->cr_uid == cr2->cr_uid);
432
433 }
434
435 static void
436 gen_clid(struct nfs4_client *clp) {
437         clp->cl_clientid.cl_boot = boot_time;
438         clp->cl_clientid.cl_id = current_clientid++; 
439 }
440
441 static void
442 gen_confirm(struct nfs4_client *clp) {
443         struct timespec         tv;
444         u32 *                   p;
445
446         tv = CURRENT_TIME;
447         p = (u32 *)clp->cl_confirm.data;
448         *p++ = tv.tv_sec;
449         *p++ = tv.tv_nsec;
450 }
451
452 static int
453 check_name(struct xdr_netobj name) {
454
455         if (name.len == 0) 
456                 return 0;
457         if (name.len > NFS4_OPAQUE_LIMIT) {
458                 printk("NFSD: check_name: name too long(%d)!\n", name.len);
459                 return 0;
460         }
461         return 1;
462 }
463
464 static void
465 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
466 {
467         unsigned int idhashval;
468
469         list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
470         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
471         list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
472         list_add_tail(&clp->cl_lru, &client_lru);
473         clp->cl_time = get_seconds();
474 }
475
476 static void
477 move_to_confirmed(struct nfs4_client *clp)
478 {
479         unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
480         unsigned int strhashval;
481
482         dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
483         list_del_init(&clp->cl_strhash);
484         list_del_init(&clp->cl_idhash);
485         list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
486         strhashval = clientstr_hashval(clp->cl_recdir);
487         list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
488         renew_client(clp);
489 }
490
491 static struct nfs4_client *
492 find_confirmed_client(clientid_t *clid)
493 {
494         struct nfs4_client *clp;
495         unsigned int idhashval = clientid_hashval(clid->cl_id);
496
497         list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
498                 if (cmp_clid(&clp->cl_clientid, clid))
499                         return clp;
500         }
501         return NULL;
502 }
503
504 static struct nfs4_client *
505 find_unconfirmed_client(clientid_t *clid)
506 {
507         struct nfs4_client *clp;
508         unsigned int idhashval = clientid_hashval(clid->cl_id);
509
510         list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
511                 if (cmp_clid(&clp->cl_clientid, clid))
512                         return clp;
513         }
514         return NULL;
515 }
516
517 static struct nfs4_client *
518 find_confirmed_client_by_str(const char *dname, unsigned int hashval)
519 {
520         struct nfs4_client *clp;
521
522         list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
523                 if (same_name(clp->cl_recdir, dname))
524                         return clp;
525         }
526         return NULL;
527 }
528
529 static struct nfs4_client *
530 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
531 {
532         struct nfs4_client *clp;
533
534         list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
535                 if (same_name(clp->cl_recdir, dname))
536                         return clp;
537         }
538         return NULL;
539 }
540
541 /* a helper function for parse_callback */
542 static int
543 parse_octet(unsigned int *lenp, char **addrp)
544 {
545         unsigned int len = *lenp;
546         char *p = *addrp;
547         int n = -1;
548         char c;
549
550         for (;;) {
551                 if (!len)
552                         break;
553                 len--;
554                 c = *p++;
555                 if (c == '.')
556                         break;
557                 if ((c < '0') || (c > '9')) {
558                         n = -1;
559                         break;
560                 }
561                 if (n < 0)
562                         n = 0;
563                 n = (n * 10) + (c - '0');
564                 if (n > 255) {
565                         n = -1;
566                         break;
567                 }
568         }
569         *lenp = len;
570         *addrp = p;
571         return n;
572 }
573
574 /* parse and set the setclientid ipv4 callback address */
575 static int
576 parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
577 {
578         int temp = 0;
579         u32 cbaddr = 0;
580         u16 cbport = 0;
581         u32 addrlen = addr_len;
582         char *addr = addr_val;
583         int i, shift;
584
585         /* ipaddress */
586         shift = 24;
587         for(i = 4; i > 0  ; i--) {
588                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
589                         return 0;
590                 }
591                 cbaddr |= (temp << shift);
592                 if (shift > 0)
593                 shift -= 8;
594         }
595         *cbaddrp = cbaddr;
596
597         /* port */
598         shift = 8;
599         for(i = 2; i > 0  ; i--) {
600                 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
601                         return 0;
602                 }
603                 cbport |= (temp << shift);
604                 if (shift > 0)
605                         shift -= 8;
606         }
607         *cbportp = cbport;
608         return 1;
609 }
610
611 static void
612 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
613 {
614         struct nfs4_callback *cb = &clp->cl_callback;
615
616         /* Currently, we only support tcp for the callback channel */
617         if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
618                 goto out_err;
619
620         if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
621                          &cb->cb_addr, &cb->cb_port)))
622                 goto out_err;
623         cb->cb_prog = se->se_callback_prog;
624         cb->cb_ident = se->se_callback_ident;
625         return;
626 out_err:
627         printk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
628                 "will not receive delegations\n",
629                 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
630
631         return;
632 }
633
634 /*
635  * RFC 3010 has a complex implmentation description of processing a 
636  * SETCLIENTID request consisting of 5 bullets, labeled as 
637  * CASE0 - CASE4 below.
638  *
639  * NOTES:
640  *      callback information will be processed in a future patch
641  *
642  *      an unconfirmed record is added when:
643  *      NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
644  *      CASE 1: confirmed record found with matching name, principal,
645  *              verifier, and clientid.
646  *      CASE 2: confirmed record found with matching name, principal,
647  *              and there is no unconfirmed record with matching
648  *              name and principal
649  *
650  *      an unconfirmed record is replaced when:
651  *      CASE 3: confirmed record found with matching name, principal,
652  *              and an unconfirmed record is found with matching 
653  *              name, principal, and with clientid and
654  *              confirm that does not match the confirmed record.
655  *      CASE 4: there is no confirmed record with matching name and 
656  *              principal. there is an unconfirmed record with 
657  *              matching name, principal.
658  *
659  *      an unconfirmed record is deleted when:
660  *      CASE 1: an unconfirmed record that matches input name, verifier,
661  *              and confirmed clientid.
662  *      CASE 4: any unconfirmed records with matching name and principal
663  *              that exist after an unconfirmed record has been replaced
664  *              as described above.
665  *
666  */
667 int
668 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid)
669 {
670         u32                     ip_addr = rqstp->rq_addr.sin_addr.s_addr;
671         struct xdr_netobj       clname = { 
672                 .len = setclid->se_namelen,
673                 .data = setclid->se_name,
674         };
675         nfs4_verifier           clverifier = setclid->se_verf;
676         unsigned int            strhashval;
677         struct nfs4_client      *conf, *unconf, *new;
678         int                     status;
679         char                    dname[HEXDIR_LEN];
680         
681         status = nfserr_inval;
682         if (!check_name(clname))
683                 goto out;
684
685         status = nfs4_make_rec_clidname(dname, &clname);
686         if (status)
687                 goto out;
688
689         /* 
690          * XXX The Duplicate Request Cache (DRC) has been checked (??)
691          * We get here on a DRC miss.
692          */
693
694         strhashval = clientstr_hashval(dname);
695
696         nfs4_lock_state();
697         conf = find_confirmed_client_by_str(dname, strhashval);
698         if (conf) {
699                 /* 
700                  * CASE 0:
701                  * clname match, confirmed, different principal
702                  * or different ip_address
703                  */
704                 status = nfserr_clid_inuse;
705                 if (!cmp_creds(&conf->cl_cred, &rqstp->rq_cred)
706                                 || conf->cl_addr != ip_addr) {
707                         printk("NFSD: setclientid: string in use by client"
708                         "(clientid %08x/%08x)\n",
709                         conf->cl_clientid.cl_boot, conf->cl_clientid.cl_id);
710                         goto out;
711                 }
712         }
713         unconf = find_unconfirmed_client_by_str(dname, strhashval);
714         status = nfserr_resource;
715         if (!conf) {
716                 /* 
717                  * CASE 4:
718                  * placed first, because it is the normal case.
719                  */
720                 if (unconf)
721                         expire_client(unconf);
722                 new = create_client(clname, dname);
723                 if (new == NULL)
724                         goto out;
725                 copy_verf(new, &clverifier);
726                 new->cl_addr = ip_addr;
727                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
728                 gen_clid(new);
729                 gen_confirm(new);
730                 gen_callback(new, setclid);
731                 add_to_unconfirmed(new, strhashval);
732         } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
733                 /*
734                  * CASE 1:
735                  * cl_name match, confirmed, principal match
736                  * verifier match: probable callback update
737                  *
738                  * remove any unconfirmed nfs4_client with 
739                  * matching cl_name, cl_verifier, and cl_clientid
740                  *
741                  * create and insert an unconfirmed nfs4_client with same 
742                  * cl_name, cl_verifier, and cl_clientid as existing 
743                  * nfs4_client,  but with the new callback info and a 
744                  * new cl_confirm
745                  */
746                 if (unconf) {
747                         /* Note this is removing unconfirmed {*x***},
748                          * which is stronger than RFC recommended {vxc**}.
749                          * This has the advantage that there is at most
750                          * one {*x***} in either list at any time.
751                          */
752                         expire_client(unconf);
753                 }
754                 new = create_client(clname, dname);
755                 if (new == NULL)
756                         goto out;
757                 copy_verf(new,&conf->cl_verifier);
758                 new->cl_addr = ip_addr;
759                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
760                 copy_clid(new, conf);
761                 gen_confirm(new);
762                 gen_callback(new, setclid);
763                 add_to_unconfirmed(new,strhashval);
764         } else if (!unconf) {
765                 /*
766                  * CASE 2:
767                  * clname match, confirmed, principal match
768                  * verfier does not match
769                  * no unconfirmed. create a new unconfirmed nfs4_client
770                  * using input clverifier, clname, and callback info
771                  * and generate a new cl_clientid and cl_confirm.
772                  */
773                 new = create_client(clname, dname);
774                 if (new == NULL)
775                         goto out;
776                 copy_verf(new,&clverifier);
777                 new->cl_addr = ip_addr;
778                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
779                 gen_clid(new);
780                 gen_confirm(new);
781                 gen_callback(new, setclid);
782                 add_to_unconfirmed(new, strhashval);
783         } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
784                 /*      
785                  * CASE3:
786                  * confirmed found (name, principal match)
787                  * confirmed verifier does not match input clverifier
788                  *
789                  * unconfirmed found (name match)
790                  * confirmed->cl_confirm != unconfirmed->cl_confirm
791                  *
792                  * remove unconfirmed.
793                  *
794                  * create an unconfirmed nfs4_client 
795                  * with same cl_name as existing confirmed nfs4_client, 
796                  * but with new callback info, new cl_clientid,
797                  * new cl_verifier and a new cl_confirm
798                  */
799                 expire_client(unconf);
800                 new = create_client(clname, dname);
801                 if (new == NULL)
802                         goto out;
803                 copy_verf(new,&clverifier);
804                 new->cl_addr = ip_addr;
805                 copy_cred(&new->cl_cred,&rqstp->rq_cred);
806                 gen_clid(new);
807                 gen_confirm(new);
808                 gen_callback(new, setclid);
809                 add_to_unconfirmed(new, strhashval);
810         } else {
811                 /* No cases hit !!! */
812                 status = nfserr_inval;
813                 goto out;
814
815         }
816         setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
817         setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
818         memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
819         status = nfs_ok;
820 out:
821         nfs4_unlock_state();
822         return status;
823 }
824
825
826 /*
827  * RFC 3010 has a complex implmentation description of processing a 
828  * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
829  * processing on a DRC miss, labeled as CASE1 - CASE4 below.
830  *
831  * NOTE: callback information will be processed here in a future patch
832  */
833 int
834 nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm)
835 {
836         u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
837         struct nfs4_client *conf, *unconf;
838         nfs4_verifier confirm = setclientid_confirm->sc_confirm; 
839         clientid_t * clid = &setclientid_confirm->sc_clientid;
840         int status;
841
842         if (STALE_CLIENTID(clid))
843                 return nfserr_stale_clientid;
844         /* 
845          * XXX The Duplicate Request Cache (DRC) has been checked (??)
846          * We get here on a DRC miss.
847          */
848
849         nfs4_lock_state();
850
851         conf = find_confirmed_client(clid);
852         unconf = find_unconfirmed_client(clid);
853
854         status = nfserr_clid_inuse;
855         if (conf && conf->cl_addr != ip_addr)
856                 goto out;
857         if (unconf && unconf->cl_addr != ip_addr)
858                 goto out;
859
860         if ((conf && unconf) && 
861             (cmp_verf(&unconf->cl_confirm, &confirm)) &&
862             (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
863             (same_name(conf->cl_recdir,unconf->cl_recdir))  &&
864             (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
865                 /* CASE 1:
866                 * unconf record that matches input clientid and input confirm.
867                 * conf record that matches input clientid.
868                 * conf and unconf records match names, verifiers
869                 */
870                 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred)) 
871                         status = nfserr_clid_inuse;
872                 else {
873                         /* XXX: We just turn off callbacks until we can handle
874                           * change request correctly. */
875                         atomic_set(&conf->cl_callback.cb_set, 0);
876                         gen_confirm(conf);
877                         nfsd4_remove_clid_dir(unconf);
878                         expire_client(unconf);
879                         status = nfs_ok;
880
881                 }
882         } else if ((conf && !unconf) ||
883             ((conf && unconf) && 
884              (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
885               !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
886                 /* CASE 2:
887                  * conf record that matches input clientid.
888                  * if unconf record matches input clientid, then
889                  * unconf->cl_name or unconf->cl_verifier don't match the
890                  * conf record.
891                  */
892                 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred))
893                         status = nfserr_clid_inuse;
894                 else
895                         status = nfs_ok;
896         } else if (!conf && unconf
897                         && cmp_verf(&unconf->cl_confirm, &confirm)) {
898                 /* CASE 3:
899                  * conf record not found.
900                  * unconf record found.
901                  * unconf->cl_confirm matches input confirm
902                  */
903                 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
904                         status = nfserr_clid_inuse;
905                 } else {
906                         unsigned int hash =
907                                 clientstr_hashval(unconf->cl_recdir);
908                         conf = find_confirmed_client_by_str(unconf->cl_recdir,
909                                                                         hash);
910                         if (conf) {
911                                 nfsd4_remove_clid_dir(conf);
912                                 expire_client(conf);
913                         }
914                         move_to_confirmed(unconf);
915                         conf = unconf;
916                         status = nfs_ok;
917                 }
918         } else if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm)))
919             && (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm,
920                                                                 &confirm)))) {
921                 /* CASE 4:
922                  * conf record not found, or if conf, conf->cl_confirm does not
923                  * match input confirm.
924                  * unconf record not found, or if unconf, unconf->cl_confirm
925                  * does not match input confirm.
926                  */
927                 status = nfserr_stale_clientid;
928         } else {
929                 /* check that we have hit one of the cases...*/
930                 status = nfserr_clid_inuse;
931         }
932 out:
933         if (!status)
934                 nfsd4_probe_callback(conf);
935         nfs4_unlock_state();
936         return status;
937 }
938
939 /* 
940  * Open owner state (share locks)
941  */
942
943 /* hash tables for nfs4_stateowner */
944 #define OWNER_HASH_BITS              8
945 #define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
946 #define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
947
948 #define ownerid_hashval(id) \
949         ((id) & OWNER_HASH_MASK)
950 #define ownerstr_hashval(clientid, ownername) \
951         (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
952
953 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
954 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
955
956 /* hash table for nfs4_file */
957 #define FILE_HASH_BITS                   8
958 #define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
959 #define FILE_HASH_MASK                  (FILE_HASH_SIZE - 1)
960 /* hash table for (open)nfs4_stateid */
961 #define STATEID_HASH_BITS              10
962 #define STATEID_HASH_SIZE              (1 << STATEID_HASH_BITS)
963 #define STATEID_HASH_MASK              (STATEID_HASH_SIZE - 1)
964
965 #define file_hashval(x) \
966         hash_ptr(x, FILE_HASH_BITS)
967 #define stateid_hashval(owner_id, file_id)  \
968         (((owner_id) + (file_id)) & STATEID_HASH_MASK)
969
970 static struct list_head file_hashtbl[FILE_HASH_SIZE];
971 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
972
973 /* OPEN Share state helper functions */
974 static inline struct nfs4_file *
975 alloc_init_file(struct inode *ino)
976 {
977         struct nfs4_file *fp;
978         unsigned int hashval = file_hashval(ino);
979
980         fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
981         if (fp) {
982                 kref_init(&fp->fi_ref);
983                 INIT_LIST_HEAD(&fp->fi_hash);
984                 INIT_LIST_HEAD(&fp->fi_stateids);
985                 INIT_LIST_HEAD(&fp->fi_delegations);
986                 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
987                 fp->fi_inode = igrab(ino);
988                 fp->fi_id = current_fileid++;
989                 return fp;
990         }
991         return NULL;
992 }
993
994 static void
995 nfsd4_free_slab(kmem_cache_t **slab)
996 {
997         int status;
998
999         if (*slab == NULL)
1000                 return;
1001         status = kmem_cache_destroy(*slab);
1002         *slab = NULL;
1003         WARN_ON(status);
1004 }
1005
1006 static void
1007 nfsd4_free_slabs(void)
1008 {
1009         nfsd4_free_slab(&stateowner_slab);
1010         nfsd4_free_slab(&file_slab);
1011         nfsd4_free_slab(&stateid_slab);
1012         nfsd4_free_slab(&deleg_slab);
1013 }
1014
1015 static int
1016 nfsd4_init_slabs(void)
1017 {
1018         stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1019                         sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1020         if (stateowner_slab == NULL)
1021                 goto out_nomem;
1022         file_slab = kmem_cache_create("nfsd4_files",
1023                         sizeof(struct nfs4_file), 0, 0, NULL, NULL);
1024         if (file_slab == NULL)
1025                 goto out_nomem;
1026         stateid_slab = kmem_cache_create("nfsd4_stateids",
1027                         sizeof(struct nfs4_stateid), 0, 0, NULL, NULL);
1028         if (stateid_slab == NULL)
1029                 goto out_nomem;
1030         deleg_slab = kmem_cache_create("nfsd4_delegations",
1031                         sizeof(struct nfs4_delegation), 0, 0, NULL, NULL);
1032         if (deleg_slab == NULL)
1033                 goto out_nomem;
1034         return 0;
1035 out_nomem:
1036         nfsd4_free_slabs();
1037         dprintk("nfsd4: out of memory while initializing nfsv4\n");
1038         return -ENOMEM;
1039 }
1040
1041 void
1042 nfs4_free_stateowner(struct kref *kref)
1043 {
1044         struct nfs4_stateowner *sop =
1045                 container_of(kref, struct nfs4_stateowner, so_ref);
1046         kfree(sop->so_owner.data);
1047         kmem_cache_free(stateowner_slab, sop);
1048 }
1049
1050 static inline struct nfs4_stateowner *
1051 alloc_stateowner(struct xdr_netobj *owner)
1052 {
1053         struct nfs4_stateowner *sop;
1054
1055         if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1056                 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1057                         memcpy(sop->so_owner.data, owner->data, owner->len);
1058                         sop->so_owner.len = owner->len;
1059                         kref_init(&sop->so_ref);
1060                         return sop;
1061                 } 
1062                 kmem_cache_free(stateowner_slab, sop);
1063         }
1064         return NULL;
1065 }
1066
1067 static struct nfs4_stateowner *
1068 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1069         struct nfs4_stateowner *sop;
1070         struct nfs4_replay *rp;
1071         unsigned int idhashval;
1072
1073         if (!(sop = alloc_stateowner(&open->op_owner)))
1074                 return NULL;
1075         idhashval = ownerid_hashval(current_ownerid);
1076         INIT_LIST_HEAD(&sop->so_idhash);
1077         INIT_LIST_HEAD(&sop->so_strhash);
1078         INIT_LIST_HEAD(&sop->so_perclient);
1079         INIT_LIST_HEAD(&sop->so_stateids);
1080         INIT_LIST_HEAD(&sop->so_perstateid);  /* not used */
1081         INIT_LIST_HEAD(&sop->so_close_lru);
1082         sop->so_time = 0;
1083         list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1084         list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1085         list_add(&sop->so_perclient, &clp->cl_openowners);
1086         sop->so_is_open_owner = 1;
1087         sop->so_id = current_ownerid++;
1088         sop->so_client = clp;
1089         sop->so_seqid = open->op_seqid;
1090         sop->so_confirmed = 0;
1091         rp = &sop->so_replay;
1092         rp->rp_status = NFSERR_SERVERFAULT;
1093         rp->rp_buflen = 0;
1094         rp->rp_buf = rp->rp_ibuf;
1095         return sop;
1096 }
1097
1098 static void
1099 release_stateid_lockowners(struct nfs4_stateid *open_stp)
1100 {
1101         struct nfs4_stateowner *lock_sop;
1102
1103         while (!list_empty(&open_stp->st_lockowners)) {
1104                 lock_sop = list_entry(open_stp->st_lockowners.next,
1105                                 struct nfs4_stateowner, so_perstateid);
1106                 /* list_del(&open_stp->st_lockowners);  */
1107                 BUG_ON(lock_sop->so_is_open_owner);
1108                 release_stateowner(lock_sop);
1109         }
1110 }
1111
1112 static void
1113 unhash_stateowner(struct nfs4_stateowner *sop)
1114 {
1115         struct nfs4_stateid *stp;
1116
1117         list_del(&sop->so_idhash);
1118         list_del(&sop->so_strhash);
1119         if (sop->so_is_open_owner)
1120                 list_del(&sop->so_perclient);
1121         list_del(&sop->so_perstateid);
1122         while (!list_empty(&sop->so_stateids)) {
1123                 stp = list_entry(sop->so_stateids.next,
1124                         struct nfs4_stateid, st_perstateowner);
1125                 if (sop->so_is_open_owner)
1126                         release_stateid(stp, OPEN_STATE);
1127                 else
1128                         release_stateid(stp, LOCK_STATE);
1129         }
1130 }
1131
1132 static void
1133 release_stateowner(struct nfs4_stateowner *sop)
1134 {
1135         unhash_stateowner(sop);
1136         list_del(&sop->so_close_lru);
1137         nfs4_put_stateowner(sop);
1138 }
1139
1140 static inline void
1141 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1142         struct nfs4_stateowner *sop = open->op_stateowner;
1143         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1144
1145         INIT_LIST_HEAD(&stp->st_hash);
1146         INIT_LIST_HEAD(&stp->st_perstateowner);
1147         INIT_LIST_HEAD(&stp->st_lockowners);
1148         INIT_LIST_HEAD(&stp->st_perfile);
1149         list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1150         list_add(&stp->st_perstateowner, &sop->so_stateids);
1151         list_add(&stp->st_perfile, &fp->fi_stateids);
1152         stp->st_stateowner = sop;
1153         get_nfs4_file(fp);
1154         stp->st_file = fp;
1155         stp->st_stateid.si_boot = boot_time;
1156         stp->st_stateid.si_stateownerid = sop->so_id;
1157         stp->st_stateid.si_fileid = fp->fi_id;
1158         stp->st_stateid.si_generation = 0;
1159         stp->st_access_bmap = 0;
1160         stp->st_deny_bmap = 0;
1161         __set_bit(open->op_share_access, &stp->st_access_bmap);
1162         __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1163 }
1164
1165 static void
1166 release_stateid(struct nfs4_stateid *stp, int flags)
1167 {
1168         struct file *filp = stp->st_vfs_file;
1169
1170         list_del(&stp->st_hash);
1171         list_del(&stp->st_perfile);
1172         list_del(&stp->st_perstateowner);
1173         if (flags & OPEN_STATE) {
1174                 release_stateid_lockowners(stp);
1175                 stp->st_vfs_file = NULL;
1176                 nfsd_close(filp);
1177         } else if (flags & LOCK_STATE)
1178                 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
1179         put_nfs4_file(stp->st_file);
1180         kmem_cache_free(stateid_slab, stp);
1181         stp = NULL;
1182 }
1183
1184 static void
1185 move_to_close_lru(struct nfs4_stateowner *sop)
1186 {
1187         dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1188
1189         unhash_stateowner(sop);
1190         list_add_tail(&sop->so_close_lru, &close_lru);
1191         sop->so_time = get_seconds();
1192 }
1193
1194 static void
1195 release_state_owner(struct nfs4_stateid *stp, int flag)
1196 {
1197         struct nfs4_stateowner *sop = stp->st_stateowner;
1198
1199         dprintk("NFSD: release_state_owner\n");
1200         release_stateid(stp, flag);
1201
1202         /* place unused nfs4_stateowners on so_close_lru list to be
1203          * released by the laundromat service after the lease period
1204          * to enable us to handle CLOSE replay
1205          */
1206         if (sop->so_confirmed && list_empty(&sop->so_stateids))
1207                 move_to_close_lru(sop);
1208 }
1209
1210 static int
1211 cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1212         return ((sop->so_owner.len == owner->len) && 
1213          !memcmp(sop->so_owner.data, owner->data, owner->len) && 
1214           (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1215 }
1216
1217 static struct nfs4_stateowner *
1218 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1219 {
1220         struct nfs4_stateowner *so = NULL;
1221
1222         list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1223                 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1224                         return so;
1225         }
1226         return NULL;
1227 }
1228
1229 /* search file_hashtbl[] for file */
1230 static struct nfs4_file *
1231 find_file(struct inode *ino)
1232 {
1233         unsigned int hashval = file_hashval(ino);
1234         struct nfs4_file *fp;
1235
1236         list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
1237                 if (fp->fi_inode == ino) {
1238                         get_nfs4_file(fp);
1239                         return fp;
1240                 }
1241         }
1242         return NULL;
1243 }
1244
1245 #define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
1246 #define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
1247
1248 static void
1249 set_access(unsigned int *access, unsigned long bmap) {
1250         int i;
1251
1252         *access = 0;
1253         for (i = 1; i < 4; i++) {
1254                 if (test_bit(i, &bmap))
1255                         *access |= i;
1256         }
1257 }
1258
1259 static void
1260 set_deny(unsigned int *deny, unsigned long bmap) {
1261         int i;
1262
1263         *deny = 0;
1264         for (i = 0; i < 4; i++) {
1265                 if (test_bit(i, &bmap))
1266                         *deny |= i ;
1267         }
1268 }
1269
1270 static int
1271 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1272         unsigned int access, deny;
1273
1274         set_access(&access, stp->st_access_bmap);
1275         set_deny(&deny, stp->st_deny_bmap);
1276         if ((access & open->op_share_deny) || (deny & open->op_share_access))
1277                 return 0;
1278         return 1;
1279 }
1280
1281 /*
1282  * Called to check deny when READ with all zero stateid or
1283  * WRITE with all zero or all one stateid
1284  */
1285 static int
1286 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1287 {
1288         struct inode *ino = current_fh->fh_dentry->d_inode;
1289         struct nfs4_file *fp;
1290         struct nfs4_stateid *stp;
1291         int ret;
1292
1293         dprintk("NFSD: nfs4_share_conflict\n");
1294
1295         fp = find_file(ino);
1296         if (!fp)
1297                 return nfs_ok;
1298         ret = nfserr_share_denied;
1299         /* Search for conflicting share reservations */
1300         list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1301                 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1302                     test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1303                         goto out;
1304         }
1305         ret = nfs_ok;
1306 out:
1307         put_nfs4_file(fp);
1308         return ret;
1309 }
1310
1311 static inline void
1312 nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1313 {
1314         if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1315                 put_write_access(filp->f_dentry->d_inode);
1316                 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1317         }
1318 }
1319
1320 /*
1321  * Recall a delegation
1322  */
1323 static int
1324 do_recall(void *__dp)
1325 {
1326         struct nfs4_delegation *dp = __dp;
1327
1328         daemonize("nfsv4-recall");
1329
1330         nfsd4_cb_recall(dp);
1331         return 0;
1332 }
1333
1334 /*
1335  * Spawn a thread to perform a recall on the delegation represented
1336  * by the lease (file_lock)
1337  *
1338  * Called from break_lease() with lock_kernel() held.
1339  * Note: we assume break_lease will only call this *once* for any given
1340  * lease.
1341  */
1342 static
1343 void nfsd_break_deleg_cb(struct file_lock *fl)
1344 {
1345         struct nfs4_delegation *dp=  (struct nfs4_delegation *)fl->fl_owner;
1346         struct task_struct *t;
1347
1348         dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1349         if (!dp)
1350                 return;
1351
1352         /* We're assuming the state code never drops its reference
1353          * without first removing the lease.  Since we're in this lease
1354          * callback (and since the lease code is serialized by the kernel
1355          * lock) we know the server hasn't removed the lease yet, we know
1356          * it's safe to take a reference: */
1357         atomic_inc(&dp->dl_count);
1358
1359         spin_lock(&recall_lock);
1360         list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1361         spin_unlock(&recall_lock);
1362
1363         /* only place dl_time is set. protected by lock_kernel*/
1364         dp->dl_time = get_seconds();
1365
1366         /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1367         fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1368
1369         t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1370         if (IS_ERR(t)) {
1371                 struct nfs4_client *clp = dp->dl_client;
1372
1373                 printk(KERN_INFO "NFSD: Callback thread failed for "
1374                         "for client (clientid %08x/%08x)\n",
1375                         clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1376                 nfs4_put_delegation(dp);
1377         }
1378 }
1379
1380 /*
1381  * The file_lock is being reapd.
1382  *
1383  * Called by locks_free_lock() with lock_kernel() held.
1384  */
1385 static
1386 void nfsd_release_deleg_cb(struct file_lock *fl)
1387 {
1388         struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1389
1390         dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1391
1392         if (!(fl->fl_flags & FL_LEASE) || !dp)
1393                 return;
1394         dp->dl_flock = NULL;
1395 }
1396
1397 /*
1398  * Set the delegation file_lock back pointer.
1399  *
1400  * Called from __setlease() with lock_kernel() held.
1401  */
1402 static
1403 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1404 {
1405         struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1406
1407         dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1408         if (!dp)
1409                 return;
1410         dp->dl_flock = new;
1411 }
1412
1413 /*
1414  * Called from __setlease() with lock_kernel() held
1415  */
1416 static
1417 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1418 {
1419         struct nfs4_delegation *onlistd =
1420                 (struct nfs4_delegation *)onlist->fl_owner;
1421         struct nfs4_delegation *tryd =
1422                 (struct nfs4_delegation *)try->fl_owner;
1423
1424         if (onlist->fl_lmops != try->fl_lmops)
1425                 return 0;
1426
1427         return onlistd->dl_client == tryd->dl_client;
1428 }
1429
1430
1431 static
1432 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1433 {
1434         if (arg & F_UNLCK)
1435                 return lease_modify(onlist, arg);
1436         else
1437                 return -EAGAIN;
1438 }
1439
1440 static struct lock_manager_operations nfsd_lease_mng_ops = {
1441         .fl_break = nfsd_break_deleg_cb,
1442         .fl_release_private = nfsd_release_deleg_cb,
1443         .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1444         .fl_mylease = nfsd_same_client_deleg_cb,
1445         .fl_change = nfsd_change_deleg_cb,
1446 };
1447
1448
1449 /*
1450  * nfsd4_process_open1()
1451  *      lookup stateowner.
1452  *              found:
1453  *                      check confirmed 
1454  *                              confirmed:
1455  *                                      check seqid
1456  *                              not confirmed:
1457  *                                      delete owner
1458  *                                      create new owner
1459  *              notfound:
1460  *                      verify clientid
1461  *                      create new owner
1462  *
1463  * called with nfs4_lock_state() held.
1464  */
1465 int
1466 nfsd4_process_open1(struct nfsd4_open *open)
1467 {
1468         int status;
1469         clientid_t *clientid = &open->op_clientid;
1470         struct nfs4_client *clp = NULL;
1471         unsigned int strhashval;
1472         struct nfs4_stateowner *sop = NULL;
1473
1474         status = nfserr_inval;
1475         if (!check_name(open->op_owner))
1476                 goto out;
1477
1478         if (STALE_CLIENTID(&open->op_clientid))
1479                 return nfserr_stale_clientid;
1480
1481         strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1482         sop = find_openstateowner_str(strhashval, open);
1483         if (sop) {
1484                 open->op_stateowner = sop;
1485                 /* check for replay */
1486                 if (open->op_seqid == sop->so_seqid - 1){
1487                         if (sop->so_replay.rp_buflen)
1488                                 return NFSERR_REPLAY_ME;
1489                         else {
1490                                 /* The original OPEN failed so spectacularly
1491                                  * that we don't even have replay data saved!
1492                                  * Therefore, we have no choice but to continue
1493                                  * processing this OPEN; presumably, we'll
1494                                  * fail again for the same reason.
1495                                  */
1496                                 dprintk("nfsd4_process_open1:"
1497                                         " replay with no replay cache\n");
1498                                 goto renew;
1499                         }
1500                 } else if (sop->so_confirmed) {
1501                         if (open->op_seqid == sop->so_seqid)
1502                                 goto renew;
1503                         status = nfserr_bad_seqid;
1504                         goto out;
1505                 } else {
1506                         /* If we get here, we received an OPEN for an
1507                          * unconfirmed nfs4_stateowner. Since the seqid's are
1508                          * different, purge the existing nfs4_stateowner, and
1509                          * instantiate a new one.
1510                          */
1511                         clp = sop->so_client;
1512                         release_stateowner(sop);
1513                 }
1514         } else {
1515                 /* nfs4_stateowner not found.
1516                  * Verify clientid and instantiate new nfs4_stateowner.
1517                  * If verify fails this is presumably the result of the
1518                  * client's lease expiring.
1519                  */
1520                 status = nfserr_expired;
1521                 clp = find_confirmed_client(clientid);
1522                 if (clp == NULL)
1523                         goto out;
1524         }
1525         status = nfserr_resource;
1526         sop = alloc_init_open_stateowner(strhashval, clp, open);
1527         if (sop == NULL)
1528                 goto out;
1529         open->op_stateowner = sop;
1530 renew:
1531         status = nfs_ok;
1532         renew_client(sop->so_client);
1533 out:
1534         return status;
1535 }
1536
1537 static inline int
1538 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1539 {
1540         if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1541                 return nfserr_openmode;
1542         else
1543                 return nfs_ok;
1544 }
1545
1546 static struct nfs4_delegation *
1547 find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1548 {
1549         struct nfs4_delegation *dp;
1550
1551         list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
1552                 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1553                         return dp;
1554         }
1555         return NULL;
1556 }
1557
1558 static int
1559 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1560                 struct nfs4_delegation **dp)
1561 {
1562         int flags;
1563         int status = nfserr_bad_stateid;
1564
1565         *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1566         if (*dp == NULL)
1567                 goto out;
1568         flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1569                                                 RD_STATE : WR_STATE;
1570         status = nfs4_check_delegmode(*dp, flags);
1571         if (status)
1572                 *dp = NULL;
1573 out:
1574         if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1575                 return nfs_ok;
1576         if (status)
1577                 return status;
1578         open->op_stateowner->so_confirmed = 1;
1579         return nfs_ok;
1580 }
1581
1582 static int
1583 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1584 {
1585         struct nfs4_stateid *local;
1586         int status = nfserr_share_denied;
1587         struct nfs4_stateowner *sop = open->op_stateowner;
1588
1589         list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1590                 /* ignore lock owners */
1591                 if (local->st_stateowner->so_is_open_owner == 0)
1592                         continue;
1593                 /* remember if we have seen this open owner */
1594                 if (local->st_stateowner == sop)
1595                         *stpp = local;
1596                 /* check for conflicting share reservations */
1597                 if (!test_share(local, open))
1598                         goto out;
1599         }
1600         status = 0;
1601 out:
1602         return status;
1603 }
1604
1605 static inline struct nfs4_stateid *
1606 nfs4_alloc_stateid(void)
1607 {
1608         return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1609 }
1610
1611 static int
1612 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
1613                 struct nfs4_delegation *dp,
1614                 struct svc_fh *cur_fh, int flags)
1615 {
1616         struct nfs4_stateid *stp;
1617
1618         stp = nfs4_alloc_stateid();
1619         if (stp == NULL)
1620                 return nfserr_resource;
1621
1622         if (dp) {
1623                 get_file(dp->dl_vfs_file);
1624                 stp->st_vfs_file = dp->dl_vfs_file;
1625         } else {
1626                 int status;
1627                 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1628                                 &stp->st_vfs_file);
1629                 if (status) {
1630                         if (status == nfserr_dropit)
1631                                 status = nfserr_jukebox;
1632                         kmem_cache_free(stateid_slab, stp);
1633                         return status;
1634                 }
1635         }
1636         *stpp = stp;
1637         return 0;
1638 }
1639
1640 static inline int
1641 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1642                 struct nfsd4_open *open)
1643 {
1644         struct iattr iattr = {
1645                 .ia_valid = ATTR_SIZE,
1646                 .ia_size = 0,
1647         };
1648         if (!open->op_truncate)
1649                 return 0;
1650         if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1651                 return -EINVAL;
1652         return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1653 }
1654
1655 static int
1656 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1657 {
1658         struct file *filp = stp->st_vfs_file;
1659         struct inode *inode = filp->f_dentry->d_inode;
1660         unsigned int share_access;
1661         int status;
1662
1663         set_access(&share_access, stp->st_access_bmap);
1664         share_access = ~share_access;
1665         share_access &= open->op_share_access;
1666
1667         if (!(share_access & NFS4_SHARE_ACCESS_WRITE))
1668                 return nfsd4_truncate(rqstp, cur_fh, open);
1669
1670         status = get_write_access(inode);
1671         if (status)
1672                 return nfserrno(status);
1673         status = nfsd4_truncate(rqstp, cur_fh, open);
1674         if (status) {
1675                 put_write_access(inode);
1676                 return status;
1677         }
1678         /* remember the open */
1679         filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
1680         set_bit(open->op_share_access, &stp->st_access_bmap);
1681         set_bit(open->op_share_deny, &stp->st_deny_bmap);
1682
1683         return nfs_ok;
1684 }
1685
1686
1687 static void
1688 nfs4_set_claim_prev(struct nfsd4_open *open)
1689 {
1690         open->op_stateowner->so_confirmed = 1;
1691         open->op_stateowner->so_client->cl_firststate = 1;
1692 }
1693
1694 /*
1695  * Attempt to hand out a delegation.
1696  */
1697 static void
1698 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1699 {
1700         struct nfs4_delegation *dp;
1701         struct nfs4_stateowner *sop = stp->st_stateowner;
1702         struct nfs4_callback *cb = &sop->so_client->cl_callback;
1703         struct file_lock fl, *flp = &fl;
1704         int status, flag = 0;
1705
1706         flag = NFS4_OPEN_DELEGATE_NONE;
1707         open->op_recall = 0;
1708         switch (open->op_claim_type) {
1709                 case NFS4_OPEN_CLAIM_PREVIOUS:
1710                         if (!atomic_read(&cb->cb_set))
1711                                 open->op_recall = 1;
1712                         flag = open->op_delegate_type;
1713                         if (flag == NFS4_OPEN_DELEGATE_NONE)
1714                                 goto out;
1715                         break;
1716                 case NFS4_OPEN_CLAIM_NULL:
1717                         /* Let's not give out any delegations till everyone's
1718                          * had the chance to reclaim theirs.... */
1719                         if (nfs4_in_grace())
1720                                 goto out;
1721                         if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1722                                 goto out;
1723                         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1724                                 flag = NFS4_OPEN_DELEGATE_WRITE;
1725                         else
1726                                 flag = NFS4_OPEN_DELEGATE_READ;
1727                         break;
1728                 default:
1729                         goto out;
1730         }
1731
1732         dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1733         if (dp == NULL) {
1734                 flag = NFS4_OPEN_DELEGATE_NONE;
1735                 goto out;
1736         }
1737         locks_init_lock(&fl);
1738         fl.fl_lmops = &nfsd_lease_mng_ops;
1739         fl.fl_flags = FL_LEASE;
1740         fl.fl_end = OFFSET_MAX;
1741         fl.fl_owner =  (fl_owner_t)dp;
1742         fl.fl_file = stp->st_vfs_file;
1743         fl.fl_pid = current->tgid;
1744
1745         /* setlease checks to see if delegation should be handed out.
1746          * the lock_manager callbacks fl_mylease and fl_change are used
1747          */
1748         if ((status = setlease(stp->st_vfs_file,
1749                 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1750                 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
1751                 unhash_delegation(dp);
1752                 flag = NFS4_OPEN_DELEGATE_NONE;
1753                 goto out;
1754         }
1755
1756         memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1757
1758         dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1759                      dp->dl_stateid.si_boot,
1760                      dp->dl_stateid.si_stateownerid,
1761                      dp->dl_stateid.si_fileid,
1762                      dp->dl_stateid.si_generation);
1763 out:
1764         if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1765                         && flag == NFS4_OPEN_DELEGATE_NONE
1766                         && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1767                 printk("NFSD: WARNING: refusing delegation reclaim\n");
1768         open->op_delegate_type = flag;
1769 }
1770
1771 /*
1772  * called with nfs4_lock_state() held.
1773  */
1774 int
1775 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1776 {
1777         struct nfs4_file *fp = NULL;
1778         struct inode *ino = current_fh->fh_dentry->d_inode;
1779         struct nfs4_stateid *stp = NULL;
1780         struct nfs4_delegation *dp = NULL;
1781         int status;
1782
1783         if (nfs4_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
1784                 return nfserr_grace;
1785
1786         if (!nfs4_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1787                 return nfserr_no_grace;
1788
1789         status = nfserr_inval;
1790         if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1791                 goto out;
1792         /*
1793          * Lookup file; if found, lookup stateid and check open request,
1794          * and check for delegations in the process of being recalled.
1795          * If not found, create the nfs4_file struct
1796          */
1797         fp = find_file(ino);
1798         if (fp) {
1799                 if ((status = nfs4_check_open(fp, open, &stp)))
1800                         goto out;
1801                 status = nfs4_check_deleg(fp, open, &dp);
1802                 if (status)
1803                         goto out;
1804         } else {
1805                 status = nfserr_bad_stateid;
1806                 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1807                         goto out;
1808                 status = nfserr_resource;
1809                 fp = alloc_init_file(ino);
1810                 if (fp == NULL)
1811                         goto out;
1812         }
1813
1814         /*
1815          * OPEN the file, or upgrade an existing OPEN.
1816          * If truncate fails, the OPEN fails.
1817          */
1818         if (stp) {
1819                 /* Stateid was found, this is an OPEN upgrade */
1820                 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1821                 if (status)
1822                         goto out;
1823         } else {
1824                 /* Stateid was not found, this is a new OPEN */
1825                 int flags = 0;
1826                 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1827                         flags = MAY_WRITE;
1828                 else
1829                         flags = MAY_READ;
1830                 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1831                 if (status)
1832                         goto out;
1833                 init_stateid(stp, fp, open);
1834                 status = nfsd4_truncate(rqstp, current_fh, open);
1835                 if (status) {
1836                         release_stateid(stp, OPEN_STATE);
1837                         goto out;
1838                 }
1839         }
1840         memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1841
1842         /*
1843         * Attempt to hand out a delegation. No error return, because the
1844         * OPEN succeeds even if we fail.
1845         */
1846         nfs4_open_delegation(current_fh, open, stp);
1847
1848         status = nfs_ok;
1849
1850         dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1851                     stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1852                     stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1853 out:
1854         if (fp)
1855                 put_nfs4_file(fp);
1856         if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1857                 nfs4_set_claim_prev(open);
1858         /*
1859         * To finish the open response, we just need to set the rflags.
1860         */
1861         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1862         if (!open->op_stateowner->so_confirmed)
1863                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1864
1865         return status;
1866 }
1867
1868 static struct workqueue_struct *laundry_wq;
1869 static struct work_struct laundromat_work;
1870 static void laundromat_main(void *);
1871 static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1872
1873 int 
1874 nfsd4_renew(clientid_t *clid)
1875 {
1876         struct nfs4_client *clp;
1877         int status;
1878
1879         nfs4_lock_state();
1880         dprintk("process_renew(%08x/%08x): starting\n", 
1881                         clid->cl_boot, clid->cl_id);
1882         status = nfserr_stale_clientid;
1883         if (STALE_CLIENTID(clid))
1884                 goto out;
1885         clp = find_confirmed_client(clid);
1886         status = nfserr_expired;
1887         if (clp == NULL) {
1888                 /* We assume the client took too long to RENEW. */
1889                 dprintk("nfsd4_renew: clientid not found!\n");
1890                 goto out;
1891         }
1892         renew_client(clp);
1893         status = nfserr_cb_path_down;
1894         if (!list_empty(&clp->cl_delegations)
1895                         && !atomic_read(&clp->cl_callback.cb_set))
1896                 goto out;
1897         status = nfs_ok;
1898 out:
1899         nfs4_unlock_state();
1900         return status;
1901 }
1902
1903 static void
1904 end_grace(void)
1905 {
1906         dprintk("NFSD: end of grace period\n");
1907         nfsd4_recdir_purge_old();
1908         in_grace = 0;
1909 }
1910
1911 static time_t
1912 nfs4_laundromat(void)
1913 {
1914         struct nfs4_client *clp;
1915         struct nfs4_stateowner *sop;
1916         struct nfs4_delegation *dp;
1917         struct list_head *pos, *next, reaplist;
1918         time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1919         time_t t, clientid_val = NFSD_LEASE_TIME;
1920         time_t u, test_val = NFSD_LEASE_TIME;
1921
1922         nfs4_lock_state();
1923
1924         dprintk("NFSD: laundromat service - starting\n");
1925         if (in_grace)
1926                 end_grace();
1927         list_for_each_safe(pos, next, &client_lru) {
1928                 clp = list_entry(pos, struct nfs4_client, cl_lru);
1929                 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1930                         t = clp->cl_time - cutoff;
1931                         if (clientid_val > t)
1932                                 clientid_val = t;
1933                         break;
1934                 }
1935                 dprintk("NFSD: purging unused client (clientid %08x)\n",
1936                         clp->cl_clientid.cl_id);
1937                 nfsd4_remove_clid_dir(clp);
1938                 expire_client(clp);
1939         }
1940         INIT_LIST_HEAD(&reaplist);
1941         spin_lock(&recall_lock);
1942         list_for_each_safe(pos, next, &del_recall_lru) {
1943                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1944                 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1945                         u = dp->dl_time - cutoff;
1946                         if (test_val > u)
1947                                 test_val = u;
1948                         break;
1949                 }
1950                 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1951                                     dp, dp->dl_flock);
1952                 list_move(&dp->dl_recall_lru, &reaplist);
1953         }
1954         spin_unlock(&recall_lock);
1955         list_for_each_safe(pos, next, &reaplist) {
1956                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1957                 list_del_init(&dp->dl_recall_lru);
1958                 unhash_delegation(dp);
1959         }
1960         test_val = NFSD_LEASE_TIME;
1961         list_for_each_safe(pos, next, &close_lru) {
1962                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1963                 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1964                         u = sop->so_time - cutoff;
1965                         if (test_val > u)
1966                                 test_val = u;
1967                         break;
1968                 }
1969                 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1970                         sop->so_id);
1971                 list_del(&sop->so_close_lru);
1972                 nfs4_put_stateowner(sop);
1973         }
1974         if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1975                 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1976         nfs4_unlock_state();
1977         return clientid_val;
1978 }
1979
1980 void
1981 laundromat_main(void *not_used)
1982 {
1983         time_t t;
1984
1985         t = nfs4_laundromat();
1986         dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
1987         queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1988 }
1989
1990 /* search ownerid_hashtbl[] and close_lru for stateid owner
1991  * (stateid->si_stateownerid)
1992  */
1993 static struct nfs4_stateowner *
1994 find_openstateowner_id(u32 st_id, int flags) {
1995         struct nfs4_stateowner *local = NULL;
1996
1997         dprintk("NFSD: find_openstateowner_id %d\n", st_id);
1998         if (flags & CLOSE_STATE) {
1999                 list_for_each_entry(local, &close_lru, so_close_lru) {
2000                         if (local->so_id == st_id)
2001                                 return local;
2002                 }
2003         }
2004         return NULL;
2005 }
2006
2007 static inline int
2008 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2009 {
2010         return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
2011 }
2012
2013 static int
2014 STALE_STATEID(stateid_t *stateid)
2015 {
2016         if (stateid->si_boot == boot_time)
2017                 return 0;
2018         printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
2019                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2020                 stateid->si_generation);
2021         return 1;
2022 }
2023
2024 static inline int
2025 access_permit_read(unsigned long access_bmap)
2026 {
2027         return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2028                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2029                 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2030 }
2031
2032 static inline int
2033 access_permit_write(unsigned long access_bmap)
2034 {
2035         return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2036                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2037 }
2038
2039 static
2040 int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
2041 {
2042         int status = nfserr_openmode;
2043
2044         if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2045                 goto out;
2046         if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2047                 goto out;
2048         status = nfs_ok;
2049 out:
2050         return status;
2051 }
2052
2053 static inline int
2054 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2055 {
2056         /* Trying to call delegreturn with a special stateid? Yuch: */
2057         if (!(flags & (RD_STATE | WR_STATE)))
2058                 return nfserr_bad_stateid;
2059         else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2060                 return nfs_ok;
2061         else if (nfs4_in_grace()) {
2062                 /* Answer in remaining cases depends on existance of
2063                  * conflicting state; so we must wait out the grace period. */
2064                 return nfserr_grace;
2065         } else if (flags & WR_STATE)
2066                 return nfs4_share_conflict(current_fh,
2067                                 NFS4_SHARE_DENY_WRITE);
2068         else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2069                 return nfs4_share_conflict(current_fh,
2070                                 NFS4_SHARE_DENY_READ);
2071 }
2072
2073 /*
2074  * Allow READ/WRITE during grace period on recovered state only for files
2075  * that are not able to provide mandatory locking.
2076  */
2077 static inline int
2078 io_during_grace_disallowed(struct inode *inode, int flags)
2079 {
2080         return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2081                 && MANDATORY_LOCK(inode);
2082 }
2083
2084 /*
2085 * Checks for stateid operations
2086 */
2087 int
2088 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2089 {
2090         struct nfs4_stateid *stp = NULL;
2091         struct nfs4_delegation *dp = NULL;
2092         stateid_t *stidp;
2093         struct inode *ino = current_fh->fh_dentry->d_inode;
2094         int status;
2095
2096         dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2097                 stateid->si_boot, stateid->si_stateownerid, 
2098                 stateid->si_fileid, stateid->si_generation); 
2099         if (filpp)
2100                 *filpp = NULL;
2101
2102         if (io_during_grace_disallowed(ino, flags))
2103                 return nfserr_grace;
2104
2105         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2106                 return check_special_stateids(current_fh, stateid, flags);
2107
2108         /* STALE STATEID */
2109         status = nfserr_stale_stateid;
2110         if (STALE_STATEID(stateid)) 
2111                 goto out;
2112
2113         /* BAD STATEID */
2114         status = nfserr_bad_stateid;
2115         if (!stateid->si_fileid) { /* delegation stateid */
2116                 if(!(dp = find_delegation_stateid(ino, stateid))) {
2117                         dprintk("NFSD: delegation stateid not found\n");
2118                         if (nfs4_in_grace())
2119                                 status = nfserr_grace;
2120                         goto out;
2121                 }
2122                 stidp = &dp->dl_stateid;
2123         } else { /* open or lock stateid */
2124                 if (!(stp = find_stateid(stateid, flags))) {
2125                         dprintk("NFSD: open or lock stateid not found\n");
2126                         if (nfs4_in_grace())
2127                                 status = nfserr_grace;
2128                         goto out;
2129                 }
2130                 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2131                         goto out;
2132                 if (!stp->st_stateowner->so_confirmed)
2133                         goto out;
2134                 stidp = &stp->st_stateid;
2135         }
2136         if (stateid->si_generation > stidp->si_generation)
2137                 goto out;
2138
2139         /* OLD STATEID */
2140         status = nfserr_old_stateid;
2141         if (stateid->si_generation < stidp->si_generation)
2142                 goto out;
2143         if (stp) {
2144                 if ((status = nfs4_check_openmode(stp,flags)))
2145                         goto out;
2146                 renew_client(stp->st_stateowner->so_client);
2147                 if (filpp)
2148                         *filpp = stp->st_vfs_file;
2149         } else if (dp) {
2150                 if ((status = nfs4_check_delegmode(dp, flags)))
2151                         goto out;
2152                 renew_client(dp->dl_client);
2153                 if (flags & DELEG_RET)
2154                         unhash_delegation(dp);
2155                 if (filpp)
2156                         *filpp = dp->dl_vfs_file;
2157         }
2158         status = nfs_ok;
2159 out:
2160         return status;
2161 }
2162
2163
2164 /* 
2165  * Checks for sequence id mutating operations. 
2166  */
2167 static int
2168 nfs4_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)
2169 {
2170         int status;
2171         struct nfs4_stateid *stp;
2172         struct nfs4_stateowner *sop;
2173
2174         dprintk("NFSD: preprocess_seqid_op: seqid=%d " 
2175                         "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2176                 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2177                 stateid->si_generation);
2178                                 
2179         *stpp = NULL;
2180         *sopp = NULL;
2181
2182         status = nfserr_bad_stateid;
2183         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2184                 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2185                 goto out;
2186         }
2187
2188         status = nfserr_stale_stateid;
2189         if (STALE_STATEID(stateid))
2190                 goto out;
2191         /*
2192         * We return BAD_STATEID if filehandle doesn't match stateid, 
2193         * the confirmed flag is incorrecly set, or the generation 
2194         * number is incorrect.  
2195         * If there is no entry in the openfile table for this id, 
2196         * we can't always return BAD_STATEID;
2197         * this might be a retransmitted CLOSE which has arrived after 
2198         * the openfile has been released.
2199         */
2200         if (!(stp = find_stateid(stateid, flags)))
2201                 goto no_nfs4_stateid;
2202
2203         status = nfserr_bad_stateid;
2204
2205         /* for new lock stateowners:
2206          * check that the lock->v.new.open_stateid
2207          * refers to an open stateowner
2208          *
2209          * check that the lockclid (nfs4_lock->v.new.clientid) is the same
2210          * as the open_stateid->st_stateowner->so_client->clientid
2211          */
2212         if (lockclid) {
2213                 struct nfs4_stateowner *sop = stp->st_stateowner;
2214                 struct nfs4_client *clp = sop->so_client;
2215
2216                 if (!sop->so_is_open_owner)
2217                         goto out;
2218                 if (!cmp_clid(&clp->cl_clientid, lockclid))
2219                         goto out;
2220         }
2221
2222         if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2223                 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2224                 goto out;
2225         }
2226
2227         *stpp = stp;
2228         *sopp = sop = stp->st_stateowner;
2229
2230         /*
2231         *  We now validate the seqid and stateid generation numbers.
2232         *  For the moment, we ignore the possibility of 
2233         *  generation number wraparound.
2234         */
2235         if (seqid != sop->so_seqid)
2236                 goto check_replay;
2237
2238         if (sop->so_confirmed) {
2239                 if (flags & CONFIRM) {
2240                         printk("NFSD: preprocess_seqid_op: expected unconfirmed stateowner!\n");
2241                         goto out;
2242                 }
2243         }
2244         else {
2245                 if (!(flags & CONFIRM)) {
2246                         printk("NFSD: preprocess_seqid_op: stateowner not confirmed yet!\n");
2247                         goto out;
2248                 }
2249         }
2250         if (stateid->si_generation > stp->st_stateid.si_generation) {
2251                 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2252                 goto out;
2253         }
2254
2255         status = nfserr_old_stateid;
2256         if (stateid->si_generation < stp->st_stateid.si_generation) {
2257                 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2258                 goto out;
2259         }
2260         /* XXX renew the client lease here */
2261         status = nfs_ok;
2262
2263 out:
2264         return status;
2265
2266 no_nfs4_stateid:
2267
2268         /*
2269         * We determine whether this is a bad stateid or a replay, 
2270         * starting by trying to look up the stateowner.
2271         * If stateowner is not found - stateid is bad.
2272         */
2273         if (!(sop = find_openstateowner_id(stateid->si_stateownerid, flags))) {
2274                 printk("NFSD: preprocess_seqid_op: no stateowner or nfs4_stateid!\n");
2275                 status = nfserr_bad_stateid;
2276                 goto out;
2277         }
2278         *sopp = sop;
2279
2280 check_replay:
2281         if (seqid == sop->so_seqid - 1) {
2282                 printk("NFSD: preprocess_seqid_op: retransmission?\n");
2283                 /* indicate replay to calling function */
2284                 status = NFSERR_REPLAY_ME;
2285         } else  {
2286                 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d\n", sop->so_seqid, seqid);
2287
2288                 *sopp = NULL;
2289                 status = nfserr_bad_seqid;
2290         }
2291         goto out;
2292 }
2293
2294 int
2295 nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc)
2296 {
2297         int status;
2298         struct nfs4_stateowner *sop;
2299         struct nfs4_stateid *stp;
2300
2301         dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2302                         (int)current_fh->fh_dentry->d_name.len,
2303                         current_fh->fh_dentry->d_name.name);
2304
2305         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2306                 goto out;
2307
2308         nfs4_lock_state();
2309
2310         if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2311                                         &oc->oc_req_stateid,
2312                                         CHECK_FH | CONFIRM | OPEN_STATE,
2313                                         &oc->oc_stateowner, &stp, NULL)))
2314                 goto out; 
2315
2316         sop = oc->oc_stateowner;
2317         sop->so_confirmed = 1;
2318         update_stateid(&stp->st_stateid);
2319         memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2320         dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d " 
2321                 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2322                          stp->st_stateid.si_boot,
2323                          stp->st_stateid.si_stateownerid,
2324                          stp->st_stateid.si_fileid,
2325                          stp->st_stateid.si_generation);
2326
2327         nfsd4_create_clid_dir(sop->so_client);
2328 out:
2329         if (oc->oc_stateowner)
2330                 nfs4_get_stateowner(oc->oc_stateowner);
2331         nfs4_unlock_state();
2332         return status;
2333 }
2334
2335
2336 /*
2337  * unset all bits in union bitmap (bmap) that
2338  * do not exist in share (from successful OPEN_DOWNGRADE)
2339  */
2340 static void
2341 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2342 {
2343         int i;
2344         for (i = 1; i < 4; i++) {
2345                 if ((i & access) != i)
2346                         __clear_bit(i, bmap);
2347         }
2348 }
2349
2350 static void
2351 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2352 {
2353         int i;
2354         for (i = 0; i < 4; i++) {
2355                 if ((i & deny) != i)
2356                         __clear_bit(i, bmap);
2357         }
2358 }
2359
2360 int
2361 nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od)
2362 {
2363         int status;
2364         struct nfs4_stateid *stp;
2365         unsigned int share_access;
2366
2367         dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n", 
2368                         (int)current_fh->fh_dentry->d_name.len,
2369                         current_fh->fh_dentry->d_name.name);
2370
2371         if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2372                 return nfserr_inval;
2373
2374         nfs4_lock_state();
2375         if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid, 
2376                                         &od->od_stateid, 
2377                                         CHECK_FH | OPEN_STATE, 
2378                                         &od->od_stateowner, &stp, NULL)))
2379                 goto out; 
2380
2381         status = nfserr_inval;
2382         if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2383                 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2384                         stp->st_access_bmap, od->od_share_access);
2385                 goto out;
2386         }
2387         if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2388                 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2389                         stp->st_deny_bmap, od->od_share_deny);
2390                 goto out;
2391         }
2392         set_access(&share_access, stp->st_access_bmap);
2393         nfs4_file_downgrade(stp->st_vfs_file,
2394                             share_access & ~od->od_share_access);
2395
2396         reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2397         reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2398
2399         update_stateid(&stp->st_stateid);
2400         memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2401         status = nfs_ok;
2402 out:
2403         if (od->od_stateowner)
2404                 nfs4_get_stateowner(od->od_stateowner);
2405         nfs4_unlock_state();
2406         return status;
2407 }
2408
2409 /*
2410  * nfs4_unlock_state() called after encode
2411  */
2412 int
2413 nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close)
2414 {
2415         int status;
2416         struct nfs4_stateid *stp;
2417
2418         dprintk("NFSD: nfsd4_close on file %.*s\n", 
2419                         (int)current_fh->fh_dentry->d_name.len,
2420                         current_fh->fh_dentry->d_name.name);
2421
2422         nfs4_lock_state();
2423         /* check close_lru for replay */
2424         if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid, 
2425                                         &close->cl_stateid, 
2426                                         CHECK_FH | OPEN_STATE | CLOSE_STATE,
2427                                         &close->cl_stateowner, &stp, NULL)))
2428                 goto out; 
2429         /*
2430         *  Return success, but first update the stateid.
2431         */
2432         status = nfs_ok;
2433         update_stateid(&stp->st_stateid);
2434         memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2435
2436         /* release_state_owner() calls nfsd_close() if needed */
2437         release_state_owner(stp, OPEN_STATE);
2438 out:
2439         if (close->cl_stateowner)
2440                 nfs4_get_stateowner(close->cl_stateowner);
2441         nfs4_unlock_state();
2442         return status;
2443 }
2444
2445 int
2446 nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2447 {
2448         int status;
2449
2450         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2451                 goto out;
2452
2453         nfs4_lock_state();
2454         status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2455         nfs4_unlock_state();
2456 out:
2457         return status;
2458 }
2459
2460
2461 /* 
2462  * Lock owner state (byte-range locks)
2463  */
2464 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
2465 #define LOCK_HASH_BITS              8
2466 #define LOCK_HASH_SIZE             (1 << LOCK_HASH_BITS)
2467 #define LOCK_HASH_MASK             (LOCK_HASH_SIZE - 1)
2468
2469 #define lockownerid_hashval(id) \
2470         ((id) & LOCK_HASH_MASK)
2471
2472 static inline unsigned int
2473 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2474                 struct xdr_netobj *ownername)
2475 {
2476         return (file_hashval(inode) + cl_id
2477                         + opaque_hashval(ownername->data, ownername->len))
2478                 & LOCK_HASH_MASK;
2479 }
2480
2481 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2482 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2483 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2484
2485 static struct nfs4_stateid *
2486 find_stateid(stateid_t *stid, int flags)
2487 {
2488         struct nfs4_stateid *local = NULL;
2489         u32 st_id = stid->si_stateownerid;
2490         u32 f_id = stid->si_fileid;
2491         unsigned int hashval;
2492
2493         dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2494         if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2495                 hashval = stateid_hashval(st_id, f_id);
2496                 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2497                         if ((local->st_stateid.si_stateownerid == st_id) &&
2498                             (local->st_stateid.si_fileid == f_id))
2499                                 return local;
2500                 }
2501         } 
2502         if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2503                 hashval = stateid_hashval(st_id, f_id);
2504                 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2505                         if ((local->st_stateid.si_stateownerid == st_id) &&
2506                             (local->st_stateid.si_fileid == f_id))
2507                                 return local;
2508                 }
2509         } else
2510                 printk("NFSD: find_stateid: ERROR: no state flag\n");
2511         return NULL;
2512 }
2513
2514 static struct nfs4_delegation *
2515 find_delegation_stateid(struct inode *ino, stateid_t *stid)
2516 {
2517         struct nfs4_file *fp;
2518         struct nfs4_delegation *dl;
2519
2520         dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2521                     stid->si_boot, stid->si_stateownerid,
2522                     stid->si_fileid, stid->si_generation);
2523
2524         fp = find_file(ino);
2525         if (!fp)
2526                 return NULL;
2527         dl = find_delegation_file(fp, stid);
2528         put_nfs4_file(fp);
2529         return dl;
2530 }
2531
2532 /*
2533  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2534  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2535  * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
2536  * locking, this prevents us from being completely protocol-compliant.  The
2537  * real solution to this problem is to start using unsigned file offsets in
2538  * the VFS, but this is a very deep change!
2539  */
2540 static inline void
2541 nfs4_transform_lock_offset(struct file_lock *lock)
2542 {
2543         if (lock->fl_start < 0)
2544                 lock->fl_start = OFFSET_MAX;
2545         if (lock->fl_end < 0)
2546                 lock->fl_end = OFFSET_MAX;
2547 }
2548
2549 static int
2550 nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2551 {
2552         struct nfs4_stateowner *local = NULL;
2553         int status = 0;
2554                                 
2555         if (hashval >= LOCK_HASH_SIZE)
2556                 goto out;
2557         list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2558                 if (local == sop) {
2559                         status = 1;
2560                         goto out;
2561                 }
2562         }
2563 out:
2564         return status;
2565 }
2566
2567
2568 static inline void
2569 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2570 {
2571         struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2572         unsigned int hval = lockownerid_hashval(sop->so_id);
2573
2574         deny->ld_sop = NULL;
2575         if (nfs4_verify_lock_stateowner(sop, hval)) {
2576                 kref_get(&sop->so_ref);
2577                 deny->ld_sop = sop;
2578                 deny->ld_clientid = sop->so_client->cl_clientid;
2579         }
2580         deny->ld_start = fl->fl_start;
2581         deny->ld_length = ~(u64)0;
2582         if (fl->fl_end != ~(u64)0)
2583                 deny->ld_length = fl->fl_end - fl->fl_start + 1;        
2584         deny->ld_type = NFS4_READ_LT;
2585         if (fl->fl_type != F_RDLCK)
2586                 deny->ld_type = NFS4_WRITE_LT;
2587 }
2588
2589 static struct nfs4_stateowner *
2590 find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2591                 struct xdr_netobj *owner)
2592 {
2593         unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2594         struct nfs4_stateowner *op;
2595
2596         list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2597                 if (cmp_owner_str(op, owner, clid))
2598                         return op;
2599         }
2600         return NULL;
2601 }
2602
2603 /*
2604  * Alloc a lock owner structure.
2605  * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has 
2606  * occured. 
2607  *
2608  * strhashval = lock_ownerstr_hashval 
2609  */
2610
2611 static struct nfs4_stateowner *
2612 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2613         struct nfs4_stateowner *sop;
2614         struct nfs4_replay *rp;
2615         unsigned int idhashval;
2616
2617         if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2618                 return NULL;
2619         idhashval = lockownerid_hashval(current_ownerid);
2620         INIT_LIST_HEAD(&sop->so_idhash);
2621         INIT_LIST_HEAD(&sop->so_strhash);
2622         INIT_LIST_HEAD(&sop->so_perclient);
2623         INIT_LIST_HEAD(&sop->so_stateids);
2624         INIT_LIST_HEAD(&sop->so_perstateid);
2625         INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2626         sop->so_time = 0;
2627         list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2628         list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2629         list_add(&sop->so_perstateid, &open_stp->st_lockowners);
2630         sop->so_is_open_owner = 0;
2631         sop->so_id = current_ownerid++;
2632         sop->so_client = clp;
2633         sop->so_seqid = lock->lk_new_lock_seqid;
2634         sop->so_confirmed = 1;
2635         rp = &sop->so_replay;
2636         rp->rp_status = NFSERR_SERVERFAULT;
2637         rp->rp_buflen = 0;
2638         rp->rp_buf = rp->rp_ibuf;
2639         return sop;
2640 }
2641
2642 static struct nfs4_stateid *
2643 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2644 {
2645         struct nfs4_stateid *stp;
2646         unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2647
2648         stp = nfs4_alloc_stateid();
2649         if (stp == NULL)
2650                 goto out;
2651         INIT_LIST_HEAD(&stp->st_hash);
2652         INIT_LIST_HEAD(&stp->st_perfile);
2653         INIT_LIST_HEAD(&stp->st_perstateowner);
2654         INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
2655         list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2656         list_add(&stp->st_perfile, &fp->fi_stateids);
2657         list_add(&stp->st_perstateowner, &sop->so_stateids);
2658         stp->st_stateowner = sop;
2659         get_nfs4_file(fp);
2660         stp->st_file = fp;
2661         stp->st_stateid.si_boot = boot_time;
2662         stp->st_stateid.si_stateownerid = sop->so_id;
2663         stp->st_stateid.si_fileid = fp->fi_id;
2664         stp->st_stateid.si_generation = 0;
2665         stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2666         stp->st_access_bmap = open_stp->st_access_bmap;
2667         stp->st_deny_bmap = open_stp->st_deny_bmap;
2668
2669 out:
2670         return stp;
2671 }
2672
2673 static int
2674 check_lock_length(u64 offset, u64 length)
2675 {
2676         return ((length == 0)  || ((length != ~(u64)0) &&
2677              LOFF_OVERFLOW(offset, length)));
2678 }
2679
2680 /*
2681  *  LOCK operation 
2682  */
2683 int
2684 nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock)
2685 {
2686         struct nfs4_stateowner *open_sop = NULL;
2687         struct nfs4_stateid *lock_stp;
2688         struct file *filp;
2689         struct file_lock file_lock;
2690         struct file_lock *conflock;
2691         int status = 0;
2692         unsigned int strhashval;
2693
2694         dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2695                 (long long) lock->lk_offset,
2696                 (long long) lock->lk_length);
2697
2698         if (check_lock_length(lock->lk_offset, lock->lk_length))
2699                  return nfserr_inval;
2700
2701         nfs4_lock_state();
2702
2703         if (lock->lk_is_new) {
2704                 /*
2705                  * Client indicates that this is a new lockowner.
2706                  * Use open owner and open stateid to create lock owner and
2707                  * lock stateid.
2708                  */
2709                 struct nfs4_stateid *open_stp = NULL;
2710                 struct nfs4_file *fp;
2711                 
2712                 status = nfserr_stale_clientid;
2713                 if (STALE_CLIENTID(&lock->lk_new_clientid)) {
2714                         printk("NFSD: nfsd4_lock: clientid is stale!\n");
2715                         goto out;
2716                 }
2717
2718                 /* is the new lock seqid presented by the client zero? */
2719                 status = nfserr_bad_seqid;
2720                 if (lock->v.new.lock_seqid != 0)
2721                         goto out;
2722
2723                 /* validate and update open stateid and open seqid */
2724                 status = nfs4_preprocess_seqid_op(current_fh, 
2725                                         lock->lk_new_open_seqid,
2726                                         &lock->lk_new_open_stateid,
2727                                         CHECK_FH | OPEN_STATE,
2728                                         &open_sop, &open_stp,
2729                                         &lock->v.new.clientid);
2730                 if (status)
2731                         goto out;
2732                 /* create lockowner and lock stateid */
2733                 fp = open_stp->st_file;
2734                 strhashval = lock_ownerstr_hashval(fp->fi_inode, 
2735                                 open_sop->so_client->cl_clientid.cl_id, 
2736                                 &lock->v.new.owner);
2737                 /* XXX: Do we need to check for duplicate stateowners on
2738                  * the same file, or should they just be allowed (and
2739                  * create new stateids)? */
2740                 status = nfserr_resource;
2741                 if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
2742                         goto out;
2743                 if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner, 
2744                                                 fp, open_stp)) == NULL) {
2745                         release_stateowner(lock->lk_stateowner);
2746                         lock->lk_stateowner = NULL;
2747                         goto out;
2748                 }
2749                 /* bump the open seqid used to create the lock */
2750                 open_sop->so_seqid++;
2751         } else {
2752                 /* lock (lock owner + lock stateid) already exists */
2753                 status = nfs4_preprocess_seqid_op(current_fh,
2754                                        lock->lk_old_lock_seqid, 
2755                                        &lock->lk_old_lock_stateid, 
2756                                        CHECK_FH | LOCK_STATE, 
2757                                        &lock->lk_stateowner, &lock_stp, NULL);
2758                 if (status)
2759                         goto out;
2760         }
2761         /* lock->lk_stateowner and lock_stp have been created or found */
2762         filp = lock_stp->st_vfs_file;
2763
2764         if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2765                 printk("NFSD: nfsd4_lock: permission denied!\n");
2766                 goto out;
2767         }
2768
2769         status = nfserr_grace;
2770         if (nfs4_in_grace() && !lock->lk_reclaim)
2771                 goto out;
2772         status = nfserr_no_grace;
2773         if (!nfs4_in_grace() && lock->lk_reclaim)
2774                 goto out;
2775
2776         locks_init_lock(&file_lock);
2777         switch (lock->lk_type) {
2778                 case NFS4_READ_LT:
2779                 case NFS4_READW_LT:
2780                         file_lock.fl_type = F_RDLCK;
2781                 break;
2782                 case NFS4_WRITE_LT:
2783                 case NFS4_WRITEW_LT:
2784                         file_lock.fl_type = F_WRLCK;
2785                 break;
2786                 default:
2787                         status = nfserr_inval;
2788                 goto out;
2789         }
2790         file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
2791         file_lock.fl_pid = current->tgid;
2792         file_lock.fl_file = filp;
2793         file_lock.fl_flags = FL_POSIX;
2794
2795         file_lock.fl_start = lock->lk_offset;
2796         if ((lock->lk_length == ~(u64)0) || 
2797                         LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2798                 file_lock.fl_end = ~(u64)0;
2799         else
2800                 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2801         nfs4_transform_lock_offset(&file_lock);
2802
2803         /*
2804         * Try to lock the file in the VFS.
2805         * Note: locks.c uses the BKL to protect the inode's lock list.
2806         */
2807
2808         status = posix_lock_file(filp, &file_lock);
2809         if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2810                 file_lock.fl_ops->fl_release_private(&file_lock);
2811         dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2812         switch (-status) {
2813         case 0: /* success! */
2814                 update_stateid(&lock_stp->st_stateid);
2815                 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid, 
2816                                 sizeof(stateid_t));
2817                 goto out;
2818         case (EAGAIN):
2819                 goto conflicting_lock;
2820         case (EDEADLK):
2821                 status = nfserr_deadlock;
2822         default:        
2823                 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2824                 goto out_destroy_new_stateid;
2825         }
2826
2827 conflicting_lock:
2828         dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2829         status = nfserr_denied;
2830         /* XXX There is a race here. Future patch needed to provide 
2831          * an atomic posix_lock_and_test_file
2832          */
2833         if (!(conflock = posix_test_lock(filp, &file_lock))) {
2834                 status = nfserr_serverfault;
2835                 goto out;
2836         }
2837         nfs4_set_lock_denied(conflock, &lock->lk_denied);
2838
2839 out_destroy_new_stateid:
2840         if (lock->lk_is_new) {
2841                 dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
2842                 /*
2843                  * An error encountered after instantiation of the new
2844                  * stateid has forced us to destroy it.
2845                  */
2846                 if (!seqid_mutating_err(status))
2847                         open_sop->so_seqid--;
2848
2849                 release_state_owner(lock_stp, LOCK_STATE);
2850         }
2851 out:
2852         if (lock->lk_stateowner)
2853                 nfs4_get_stateowner(lock->lk_stateowner);
2854         nfs4_unlock_state();
2855         return status;
2856 }
2857
2858 /*
2859  * LOCKT operation
2860  */
2861 int
2862 nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2863 {
2864         struct inode *inode;
2865         struct file file;
2866         struct file_lock file_lock;
2867         struct file_lock *conflicting_lock;
2868         int status;
2869
2870         if (nfs4_in_grace())
2871                 return nfserr_grace;
2872
2873         if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2874                  return nfserr_inval;
2875
2876         lockt->lt_stateowner = NULL;
2877         nfs4_lock_state();
2878
2879         status = nfserr_stale_clientid;
2880         if (STALE_CLIENTID(&lockt->lt_clientid)) {
2881                 printk("NFSD: nfsd4_lockt: clientid is stale!\n");
2882                 goto out;
2883         }
2884
2885         if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2886                 printk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2887                 if (status == nfserr_symlink)
2888                         status = nfserr_inval;
2889                 goto out;
2890         }
2891
2892         inode = current_fh->fh_dentry->d_inode;
2893         locks_init_lock(&file_lock);
2894         switch (lockt->lt_type) {
2895                 case NFS4_READ_LT:
2896                 case NFS4_READW_LT:
2897                         file_lock.fl_type = F_RDLCK;
2898                 break;
2899                 case NFS4_WRITE_LT:
2900                 case NFS4_WRITEW_LT:
2901                         file_lock.fl_type = F_WRLCK;
2902                 break;
2903                 default:
2904                         printk("NFSD: nfs4_lockt: bad lock type!\n");
2905                         status = nfserr_inval;
2906                 goto out;
2907         }
2908
2909         lockt->lt_stateowner = find_lockstateowner_str(inode,
2910                         &lockt->lt_clientid, &lockt->lt_owner);
2911         if (lockt->lt_stateowner)
2912                 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2913         file_lock.fl_pid = current->tgid;
2914         file_lock.fl_flags = FL_POSIX;
2915
2916         file_lock.fl_start = lockt->lt_offset;
2917         if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2918                 file_lock.fl_end = ~(u64)0;
2919         else
2920                 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2921
2922         nfs4_transform_lock_offset(&file_lock);
2923
2924         /* posix_test_lock uses the struct file _only_ to resolve the inode.
2925          * since LOCKT doesn't require an OPEN, and therefore a struct
2926          * file may not exist, pass posix_test_lock a struct file with
2927          * only the dentry:inode set.
2928          */
2929         memset(&file, 0, sizeof (struct file));
2930         file.f_dentry = current_fh->fh_dentry;
2931
2932         status = nfs_ok;
2933         conflicting_lock = posix_test_lock(&file, &file_lock);
2934         if (conflicting_lock) {
2935                 status = nfserr_denied;
2936                 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2937         }
2938 out:
2939         nfs4_unlock_state();
2940         return status;
2941 }
2942
2943 int
2944 nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku)
2945 {
2946         struct nfs4_stateid *stp;
2947         struct file *filp = NULL;
2948         struct file_lock file_lock;
2949         int status;
2950                                                         
2951         dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2952                 (long long) locku->lu_offset,
2953                 (long long) locku->lu_length);
2954
2955         if (check_lock_length(locku->lu_offset, locku->lu_length))
2956                  return nfserr_inval;
2957
2958         nfs4_lock_state();
2959                                                                                 
2960         if ((status = nfs4_preprocess_seqid_op(current_fh, 
2961                                         locku->lu_seqid, 
2962                                         &locku->lu_stateid, 
2963                                         CHECK_FH | LOCK_STATE, 
2964                                         &locku->lu_stateowner, &stp, NULL)))
2965                 goto out;
2966
2967         filp = stp->st_vfs_file;
2968         BUG_ON(!filp);
2969         locks_init_lock(&file_lock);
2970         file_lock.fl_type = F_UNLCK;
2971         file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2972         file_lock.fl_pid = current->tgid;
2973         file_lock.fl_file = filp;
2974         file_lock.fl_flags = FL_POSIX; 
2975         file_lock.fl_start = locku->lu_offset;
2976
2977         if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2978                 file_lock.fl_end = ~(u64)0;
2979         else
2980                 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2981         nfs4_transform_lock_offset(&file_lock);
2982
2983         /*
2984         *  Try to unlock the file in the VFS.
2985         */
2986         status = posix_lock_file(filp, &file_lock); 
2987         if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2988                 file_lock.fl_ops->fl_release_private(&file_lock);
2989         if (status) {
2990                 printk("NFSD: nfs4_locku: posix_lock_file failed!\n");
2991                 goto out_nfserr;
2992         }
2993         /*
2994         * OK, unlock succeeded; the only thing left to do is update the stateid.
2995         */
2996         update_stateid(&stp->st_stateid);
2997         memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2998
2999 out:
3000         if (locku->lu_stateowner)
3001                 nfs4_get_stateowner(locku->lu_stateowner);
3002         nfs4_unlock_state();
3003         return status;
3004
3005 out_nfserr:
3006         status = nfserrno(status);
3007         goto out;
3008 }
3009
3010 /*
3011  * returns
3012  *      1: locks held by lockowner
3013  *      0: no locks held by lockowner
3014  */
3015 static int
3016 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3017 {
3018         struct file_lock **flpp;
3019         struct inode *inode = filp->f_dentry->d_inode;
3020         int status = 0;
3021
3022         lock_kernel();
3023         for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
3024                 if ((*flpp)->fl_owner == (fl_owner_t)lowner)
3025                         status = 1;
3026                         goto out;
3027         }
3028 out:
3029         unlock_kernel();
3030         return status;
3031 }
3032
3033 int
3034 nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
3035 {
3036         clientid_t *clid = &rlockowner->rl_clientid;
3037         struct nfs4_stateowner *sop;
3038         struct nfs4_stateid *stp;
3039         struct xdr_netobj *owner = &rlockowner->rl_owner;
3040         struct list_head matches;
3041         int i;
3042         int status;
3043
3044         dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3045                 clid->cl_boot, clid->cl_id);
3046
3047         /* XXX check for lease expiration */
3048
3049         status = nfserr_stale_clientid;
3050         if (STALE_CLIENTID(clid)) {
3051                 printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n");
3052                 return status;
3053         }
3054
3055         nfs4_lock_state();
3056
3057         status = nfserr_locks_held;
3058         /* XXX: we're doing a linear search through all the lockowners.
3059          * Yipes!  For now we'll just hope clients aren't really using
3060          * release_lockowner much, but eventually we have to fix these
3061          * data structures. */
3062         INIT_LIST_HEAD(&matches);
3063         for (i = 0; i < LOCK_HASH_SIZE; i++) {
3064                 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
3065                         if (!cmp_owner_str(sop, owner, clid))
3066                                 continue;
3067                         list_for_each_entry(stp, &sop->so_stateids,
3068                                         st_perstateowner) {
3069                                 if (check_for_locks(stp->st_vfs_file, sop))
3070                                         goto out;
3071                                 /* Note: so_perclient unused for lockowners,
3072                                  * so it's OK to fool with here. */
3073                                 list_add(&sop->so_perclient, &matches);
3074                         }
3075                 }
3076         }
3077         /* Clients probably won't expect us to return with some (but not all)
3078          * of the lockowner state released; so don't release any until all
3079          * have been checked. */
3080         status = nfs_ok;
3081         while (!list_empty(&matches)) {
3082                 sop = list_entry(matches.next, struct nfs4_stateowner,
3083                                                                 so_perclient);
3084                 /* unhash_stateowner deletes so_perclient only
3085                  * for openowners. */
3086                 list_del(&sop->so_perclient);
3087                 release_stateowner(sop);
3088         }
3089 out:
3090         nfs4_unlock_state();
3091         return status;
3092 }
3093
3094 static inline struct nfs4_client_reclaim *
3095 alloc_reclaim(void)
3096 {
3097         return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
3098 }
3099
3100 int
3101 nfs4_has_reclaimed_state(const char *name)
3102 {
3103         unsigned int strhashval = clientstr_hashval(name);
3104         struct nfs4_client *clp;
3105
3106         clp = find_confirmed_client_by_str(name, strhashval);
3107         return clp ? 1 : 0;
3108 }
3109
3110 /*
3111  * failure => all reset bets are off, nfserr_no_grace...
3112  */
3113 int
3114 nfs4_client_to_reclaim(const char *name)
3115 {
3116         unsigned int strhashval;
3117         struct nfs4_client_reclaim *crp = NULL;
3118
3119         dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3120         crp = alloc_reclaim();
3121         if (!crp)
3122                 return 0;
3123         strhashval = clientstr_hashval(name);
3124         INIT_LIST_HEAD(&crp->cr_strhash);
3125         list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3126         memcpy(crp->cr_recdir, name, HEXDIR_LEN);
3127         reclaim_str_hashtbl_size++;
3128         return 1;
3129 }
3130
3131 static void
3132 nfs4_release_reclaim(void)
3133 {
3134         struct nfs4_client_reclaim *crp = NULL;
3135         int i;
3136
3137         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3138                 while (!list_empty(&reclaim_str_hashtbl[i])) {
3139                         crp = list_entry(reclaim_str_hashtbl[i].next,
3140                                         struct nfs4_client_reclaim, cr_strhash);
3141                         list_del(&crp->cr_strhash);
3142                         kfree(crp);
3143                         reclaim_str_hashtbl_size--;
3144                 }
3145         }
3146         BUG_ON(reclaim_str_hashtbl_size);
3147 }
3148
3149 /*
3150  * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3151 static struct nfs4_client_reclaim *
3152 nfs4_find_reclaim_client(clientid_t *clid)
3153 {
3154         unsigned int strhashval;
3155         struct nfs4_client *clp;
3156         struct nfs4_client_reclaim *crp = NULL;
3157
3158
3159         /* find clientid in conf_id_hashtbl */
3160         clp = find_confirmed_client(clid);
3161         if (clp == NULL)
3162                 return NULL;
3163
3164         dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3165                             clp->cl_name.len, clp->cl_name.data,
3166                             clp->cl_recdir);
3167
3168         /* find clp->cl_name in reclaim_str_hashtbl */
3169         strhashval = clientstr_hashval(clp->cl_recdir);
3170         list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3171                 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
3172                         return crp;
3173                 }
3174         }
3175         return NULL;
3176 }
3177
3178 /*
3179 * Called from OPEN. Look for clientid in reclaim list.
3180 */
3181 int
3182 nfs4_check_open_reclaim(clientid_t *clid)
3183 {
3184         return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
3185 }
3186
3187 /* initialization to perform at module load time: */
3188
3189 void
3190 nfs4_state_init(void)
3191 {
3192         int i;
3193
3194         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3195                 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3196                 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3197                 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3198                 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3199         }
3200         for (i = 0; i < FILE_HASH_SIZE; i++) {
3201                 INIT_LIST_HEAD(&file_hashtbl[i]);
3202         }
3203         for (i = 0; i < OWNER_HASH_SIZE; i++) {
3204                 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3205                 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3206         }
3207         for (i = 0; i < STATEID_HASH_SIZE; i++) {
3208                 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3209                 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3210         }
3211         for (i = 0; i < LOCK_HASH_SIZE; i++) {
3212                 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3213                 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3214         }
3215         memset(&onestateid, ~0, sizeof(stateid_t));
3216         INIT_LIST_HEAD(&close_lru);
3217         INIT_LIST_HEAD(&client_lru);
3218         INIT_LIST_HEAD(&del_recall_lru);
3219         for (i = 0; i < CLIENT_HASH_SIZE; i++)
3220                 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3221         reclaim_str_hashtbl_size = 0;
3222 }
3223
3224 static void
3225 nfsd4_load_reboot_recovery_data(void)
3226 {
3227         int status;
3228
3229         nfs4_lock_state();
3230         nfsd4_init_recdir(user_recovery_dirname);
3231         status = nfsd4_recdir_load();
3232         nfs4_unlock_state();
3233         if (status)
3234                 printk("NFSD: Failure reading reboot recovery data\n");
3235 }
3236
3237 /* initialization to perform when the nfsd service is started: */
3238
3239 static void
3240 __nfs4_state_start(void)
3241 {
3242         time_t grace_time;
3243
3244         boot_time = get_seconds();
3245         grace_time = max(user_lease_time, lease_time);
3246         lease_time = user_lease_time;
3247         in_grace = 1;
3248         printk("NFSD: starting %ld-second grace period\n", grace_time);
3249         laundry_wq = create_singlethread_workqueue("nfsd4");
3250         queue_delayed_work(laundry_wq, &laundromat_work, grace_time*HZ);
3251 }
3252
3253 int
3254 nfs4_state_start(void)
3255 {
3256         int status;
3257
3258         if (nfs4_init)
3259                 return 0;
3260         status = nfsd4_init_slabs();
3261         if (status)
3262                 return status;
3263         nfsd4_load_reboot_recovery_data();
3264         __nfs4_state_start();
3265         nfs4_init = 1;
3266         return 0;
3267 }
3268
3269 int
3270 nfs4_in_grace(void)
3271 {
3272         return in_grace;
3273 }
3274
3275 time_t
3276 nfs4_lease_time(void)
3277 {
3278         return lease_time;
3279 }
3280
3281 static void
3282 __nfs4_state_shutdown(void)
3283 {
3284         int i;
3285         struct nfs4_client *clp = NULL;
3286         struct nfs4_delegation *dp = NULL;
3287         struct nfs4_stateowner *sop = NULL;
3288         struct list_head *pos, *next, reaplist;
3289
3290         list_for_each_safe(pos, next, &close_lru) {
3291                 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3292                 list_del(&sop->so_close_lru);
3293                 nfs4_put_stateowner(sop);
3294         }
3295
3296         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3297                 while (!list_empty(&conf_id_hashtbl[i])) {
3298                         clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3299                         expire_client(clp);
3300                 }
3301                 while (!list_empty(&unconf_str_hashtbl[i])) {
3302                         clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3303                         expire_client(clp);
3304                 }
3305         }
3306         INIT_LIST_HEAD(&reaplist);
3307         spin_lock(&recall_lock);
3308         list_for_each_safe(pos, next, &del_recall_lru) {
3309                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3310                 list_move(&dp->dl_recall_lru, &reaplist);
3311         }
3312         spin_unlock(&recall_lock);
3313         list_for_each_safe(pos, next, &reaplist) {
3314                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3315                 list_del_init(&dp->dl_recall_lru);
3316                 unhash_delegation(dp);
3317         }
3318
3319         cancel_delayed_work(&laundromat_work);
3320         flush_workqueue(laundry_wq);
3321         destroy_workqueue(laundry_wq);
3322         nfsd4_shutdown_recdir();
3323         nfs4_init = 0;
3324 }
3325
3326 void
3327 nfs4_state_shutdown(void)
3328 {
3329         nfs4_lock_state();
3330         nfs4_release_reclaim();
3331         __nfs4_state_shutdown();
3332         nfsd4_free_slabs();
3333         nfs4_unlock_state();
3334 }
3335
3336 static void
3337 nfs4_set_recdir(char *recdir)
3338 {
3339         nfs4_lock_state();
3340         strcpy(user_recovery_dirname, recdir);
3341         nfs4_unlock_state();
3342 }
3343
3344 /*
3345  * Change the NFSv4 recovery directory to recdir.
3346  */
3347 int
3348 nfs4_reset_recoverydir(char *recdir)
3349 {
3350         int status;
3351         struct nameidata nd;
3352
3353         status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3354         if (status)
3355                 return status;
3356         status = -ENOTDIR;
3357         if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3358                 nfs4_set_recdir(recdir);
3359                 status = 0;
3360         }
3361         path_release(&nd);
3362         return status;
3363 }
3364
3365 /*
3366  * Called when leasetime is changed.
3367  *
3368  * The only way the protocol gives us to handle on-the-fly lease changes is to
3369  * simulate a reboot.  Instead of doing that, we just wait till the next time
3370  * we start to register any changes in lease time.  If the administrator
3371  * really wants to change the lease time *now*, they can go ahead and bring
3372  * nfsd down and then back up again after changing the lease time.
3373  */
3374 void
3375 nfs4_reset_lease(time_t leasetime)
3376 {
3377         lock_kernel();
3378         user_lease_time = leasetime;
3379         unlock_kernel();
3380 }