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1 | /* | |
2 | * Copyright (c) 2001 The Regents of the University of Michigan. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Kendrick Smith <kmsmith@umich.edu> | |
6 | * Andy Adamson <kandros@umich.edu> | |
7 | * | |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * | |
12 | * 1. Redistributions of source code must retain the above copyright | |
13 | * notice, this list of conditions and the following disclaimer. | |
14 | * 2. Redistributions in binary form must reproduce the above copyright | |
15 | * notice, this list of conditions and the following disclaimer in the | |
16 | * documentation and/or other materials provided with the distribution. | |
17 | * 3. Neither the name of the University nor the names of its | |
18 | * contributors may be used to endorse or promote products derived | |
19 | * from this software without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
24 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
26 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
27 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
28 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
29 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
30 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
31 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
32 | * | |
33 | */ | |
34 | ||
35 | #include <linux/file.h> | |
36 | #include <linux/fs.h> | |
37 | #include <linux/slab.h> | |
38 | #include <linux/namei.h> | |
39 | #include <linux/swap.h> | |
40 | #include <linux/pagemap.h> | |
41 | #include <linux/ratelimit.h> | |
42 | #include <linux/sunrpc/svcauth_gss.h> | |
43 | #include <linux/sunrpc/addr.h> | |
44 | #include <linux/jhash.h> | |
45 | #include "xdr4.h" | |
46 | #include "xdr4cb.h" | |
47 | #include "vfs.h" | |
48 | #include "current_stateid.h" | |
49 | ||
50 | #include "netns.h" | |
51 | #include "pnfs.h" | |
52 | ||
53 | #define NFSDDBG_FACILITY NFSDDBG_PROC | |
54 | ||
55 | #define all_ones {{~0,~0},~0} | |
56 | static const stateid_t one_stateid = { | |
57 | .si_generation = ~0, | |
58 | .si_opaque = all_ones, | |
59 | }; | |
60 | static const stateid_t zero_stateid = { | |
61 | /* all fields zero */ | |
62 | }; | |
63 | static const stateid_t currentstateid = { | |
64 | .si_generation = 1, | |
65 | }; | |
66 | ||
67 | static u64 current_sessionid = 1; | |
68 | ||
69 | #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t))) | |
70 | #define ONE_STATEID(stateid) (!memcmp((stateid), &one_stateid, sizeof(stateid_t))) | |
71 | #define CURRENT_STATEID(stateid) (!memcmp((stateid), ¤tstateid, sizeof(stateid_t))) | |
72 | ||
73 | /* forward declarations */ | |
74 | static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner); | |
75 | static void nfs4_free_ol_stateid(struct nfs4_stid *stid); | |
76 | ||
77 | /* Locking: */ | |
78 | ||
79 | /* | |
80 | * Currently used for the del_recall_lru and file hash table. In an | |
81 | * effort to decrease the scope of the client_mutex, this spinlock may | |
82 | * eventually cover more: | |
83 | */ | |
84 | static DEFINE_SPINLOCK(state_lock); | |
85 | ||
86 | /* | |
87 | * A waitqueue for all in-progress 4.0 CLOSE operations that are waiting for | |
88 | * the refcount on the open stateid to drop. | |
89 | */ | |
90 | static DECLARE_WAIT_QUEUE_HEAD(close_wq); | |
91 | ||
92 | static struct kmem_cache *openowner_slab; | |
93 | static struct kmem_cache *lockowner_slab; | |
94 | static struct kmem_cache *file_slab; | |
95 | static struct kmem_cache *stateid_slab; | |
96 | static struct kmem_cache *deleg_slab; | |
97 | static struct kmem_cache *odstate_slab; | |
98 | ||
99 | static void free_session(struct nfsd4_session *); | |
100 | ||
101 | static const struct nfsd4_callback_ops nfsd4_cb_recall_ops; | |
102 | ||
103 | static bool is_session_dead(struct nfsd4_session *ses) | |
104 | { | |
105 | return ses->se_flags & NFS4_SESSION_DEAD; | |
106 | } | |
107 | ||
108 | static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me) | |
109 | { | |
110 | if (atomic_read(&ses->se_ref) > ref_held_by_me) | |
111 | return nfserr_jukebox; | |
112 | ses->se_flags |= NFS4_SESSION_DEAD; | |
113 | return nfs_ok; | |
114 | } | |
115 | ||
116 | static bool is_client_expired(struct nfs4_client *clp) | |
117 | { | |
118 | return clp->cl_time == 0; | |
119 | } | |
120 | ||
121 | static __be32 get_client_locked(struct nfs4_client *clp) | |
122 | { | |
123 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
124 | ||
125 | lockdep_assert_held(&nn->client_lock); | |
126 | ||
127 | if (is_client_expired(clp)) | |
128 | return nfserr_expired; | |
129 | atomic_inc(&clp->cl_refcount); | |
130 | return nfs_ok; | |
131 | } | |
132 | ||
133 | /* must be called under the client_lock */ | |
134 | static inline void | |
135 | renew_client_locked(struct nfs4_client *clp) | |
136 | { | |
137 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
138 | ||
139 | if (is_client_expired(clp)) { | |
140 | WARN_ON(1); | |
141 | printk("%s: client (clientid %08x/%08x) already expired\n", | |
142 | __func__, | |
143 | clp->cl_clientid.cl_boot, | |
144 | clp->cl_clientid.cl_id); | |
145 | return; | |
146 | } | |
147 | ||
148 | dprintk("renewing client (clientid %08x/%08x)\n", | |
149 | clp->cl_clientid.cl_boot, | |
150 | clp->cl_clientid.cl_id); | |
151 | list_move_tail(&clp->cl_lru, &nn->client_lru); | |
152 | clp->cl_time = get_seconds(); | |
153 | } | |
154 | ||
155 | static void put_client_renew_locked(struct nfs4_client *clp) | |
156 | { | |
157 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
158 | ||
159 | lockdep_assert_held(&nn->client_lock); | |
160 | ||
161 | if (!atomic_dec_and_test(&clp->cl_refcount)) | |
162 | return; | |
163 | if (!is_client_expired(clp)) | |
164 | renew_client_locked(clp); | |
165 | } | |
166 | ||
167 | static void put_client_renew(struct nfs4_client *clp) | |
168 | { | |
169 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
170 | ||
171 | if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock)) | |
172 | return; | |
173 | if (!is_client_expired(clp)) | |
174 | renew_client_locked(clp); | |
175 | spin_unlock(&nn->client_lock); | |
176 | } | |
177 | ||
178 | static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses) | |
179 | { | |
180 | __be32 status; | |
181 | ||
182 | if (is_session_dead(ses)) | |
183 | return nfserr_badsession; | |
184 | status = get_client_locked(ses->se_client); | |
185 | if (status) | |
186 | return status; | |
187 | atomic_inc(&ses->se_ref); | |
188 | return nfs_ok; | |
189 | } | |
190 | ||
191 | static void nfsd4_put_session_locked(struct nfsd4_session *ses) | |
192 | { | |
193 | struct nfs4_client *clp = ses->se_client; | |
194 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
195 | ||
196 | lockdep_assert_held(&nn->client_lock); | |
197 | ||
198 | if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses)) | |
199 | free_session(ses); | |
200 | put_client_renew_locked(clp); | |
201 | } | |
202 | ||
203 | static void nfsd4_put_session(struct nfsd4_session *ses) | |
204 | { | |
205 | struct nfs4_client *clp = ses->se_client; | |
206 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
207 | ||
208 | spin_lock(&nn->client_lock); | |
209 | nfsd4_put_session_locked(ses); | |
210 | spin_unlock(&nn->client_lock); | |
211 | } | |
212 | ||
213 | static inline struct nfs4_stateowner * | |
214 | nfs4_get_stateowner(struct nfs4_stateowner *sop) | |
215 | { | |
216 | atomic_inc(&sop->so_count); | |
217 | return sop; | |
218 | } | |
219 | ||
220 | static int | |
221 | same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner) | |
222 | { | |
223 | return (sop->so_owner.len == owner->len) && | |
224 | 0 == memcmp(sop->so_owner.data, owner->data, owner->len); | |
225 | } | |
226 | ||
227 | static struct nfs4_openowner * | |
228 | find_openstateowner_str_locked(unsigned int hashval, struct nfsd4_open *open, | |
229 | struct nfs4_client *clp) | |
230 | { | |
231 | struct nfs4_stateowner *so; | |
232 | ||
233 | lockdep_assert_held(&clp->cl_lock); | |
234 | ||
235 | list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[hashval], | |
236 | so_strhash) { | |
237 | if (!so->so_is_open_owner) | |
238 | continue; | |
239 | if (same_owner_str(so, &open->op_owner)) | |
240 | return openowner(nfs4_get_stateowner(so)); | |
241 | } | |
242 | return NULL; | |
243 | } | |
244 | ||
245 | static struct nfs4_openowner * | |
246 | find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open, | |
247 | struct nfs4_client *clp) | |
248 | { | |
249 | struct nfs4_openowner *oo; | |
250 | ||
251 | spin_lock(&clp->cl_lock); | |
252 | oo = find_openstateowner_str_locked(hashval, open, clp); | |
253 | spin_unlock(&clp->cl_lock); | |
254 | return oo; | |
255 | } | |
256 | ||
257 | static inline u32 | |
258 | opaque_hashval(const void *ptr, int nbytes) | |
259 | { | |
260 | unsigned char *cptr = (unsigned char *) ptr; | |
261 | ||
262 | u32 x = 0; | |
263 | while (nbytes--) { | |
264 | x *= 37; | |
265 | x += *cptr++; | |
266 | } | |
267 | return x; | |
268 | } | |
269 | ||
270 | static void nfsd4_free_file_rcu(struct rcu_head *rcu) | |
271 | { | |
272 | struct nfs4_file *fp = container_of(rcu, struct nfs4_file, fi_rcu); | |
273 | ||
274 | kmem_cache_free(file_slab, fp); | |
275 | } | |
276 | ||
277 | void | |
278 | put_nfs4_file(struct nfs4_file *fi) | |
279 | { | |
280 | might_lock(&state_lock); | |
281 | ||
282 | if (atomic_dec_and_lock(&fi->fi_ref, &state_lock)) { | |
283 | hlist_del_rcu(&fi->fi_hash); | |
284 | spin_unlock(&state_lock); | |
285 | WARN_ON_ONCE(!list_empty(&fi->fi_clnt_odstate)); | |
286 | WARN_ON_ONCE(!list_empty(&fi->fi_delegations)); | |
287 | call_rcu(&fi->fi_rcu, nfsd4_free_file_rcu); | |
288 | } | |
289 | } | |
290 | ||
291 | static struct file * | |
292 | __nfs4_get_fd(struct nfs4_file *f, int oflag) | |
293 | { | |
294 | if (f->fi_fds[oflag]) | |
295 | return get_file(f->fi_fds[oflag]); | |
296 | return NULL; | |
297 | } | |
298 | ||
299 | static struct file * | |
300 | find_writeable_file_locked(struct nfs4_file *f) | |
301 | { | |
302 | struct file *ret; | |
303 | ||
304 | lockdep_assert_held(&f->fi_lock); | |
305 | ||
306 | ret = __nfs4_get_fd(f, O_WRONLY); | |
307 | if (!ret) | |
308 | ret = __nfs4_get_fd(f, O_RDWR); | |
309 | return ret; | |
310 | } | |
311 | ||
312 | static struct file * | |
313 | find_writeable_file(struct nfs4_file *f) | |
314 | { | |
315 | struct file *ret; | |
316 | ||
317 | spin_lock(&f->fi_lock); | |
318 | ret = find_writeable_file_locked(f); | |
319 | spin_unlock(&f->fi_lock); | |
320 | ||
321 | return ret; | |
322 | } | |
323 | ||
324 | static struct file *find_readable_file_locked(struct nfs4_file *f) | |
325 | { | |
326 | struct file *ret; | |
327 | ||
328 | lockdep_assert_held(&f->fi_lock); | |
329 | ||
330 | ret = __nfs4_get_fd(f, O_RDONLY); | |
331 | if (!ret) | |
332 | ret = __nfs4_get_fd(f, O_RDWR); | |
333 | return ret; | |
334 | } | |
335 | ||
336 | static struct file * | |
337 | find_readable_file(struct nfs4_file *f) | |
338 | { | |
339 | struct file *ret; | |
340 | ||
341 | spin_lock(&f->fi_lock); | |
342 | ret = find_readable_file_locked(f); | |
343 | spin_unlock(&f->fi_lock); | |
344 | ||
345 | return ret; | |
346 | } | |
347 | ||
348 | struct file * | |
349 | find_any_file(struct nfs4_file *f) | |
350 | { | |
351 | struct file *ret; | |
352 | ||
353 | spin_lock(&f->fi_lock); | |
354 | ret = __nfs4_get_fd(f, O_RDWR); | |
355 | if (!ret) { | |
356 | ret = __nfs4_get_fd(f, O_WRONLY); | |
357 | if (!ret) | |
358 | ret = __nfs4_get_fd(f, O_RDONLY); | |
359 | } | |
360 | spin_unlock(&f->fi_lock); | |
361 | return ret; | |
362 | } | |
363 | ||
364 | static atomic_long_t num_delegations; | |
365 | unsigned long max_delegations; | |
366 | ||
367 | /* | |
368 | * Open owner state (share locks) | |
369 | */ | |
370 | ||
371 | /* hash tables for lock and open owners */ | |
372 | #define OWNER_HASH_BITS 8 | |
373 | #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS) | |
374 | #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1) | |
375 | ||
376 | static unsigned int ownerstr_hashval(struct xdr_netobj *ownername) | |
377 | { | |
378 | unsigned int ret; | |
379 | ||
380 | ret = opaque_hashval(ownername->data, ownername->len); | |
381 | return ret & OWNER_HASH_MASK; | |
382 | } | |
383 | ||
384 | /* hash table for nfs4_file */ | |
385 | #define FILE_HASH_BITS 8 | |
386 | #define FILE_HASH_SIZE (1 << FILE_HASH_BITS) | |
387 | ||
388 | static unsigned int nfsd_fh_hashval(struct knfsd_fh *fh) | |
389 | { | |
390 | return jhash2(fh->fh_base.fh_pad, XDR_QUADLEN(fh->fh_size), 0); | |
391 | } | |
392 | ||
393 | static unsigned int file_hashval(struct knfsd_fh *fh) | |
394 | { | |
395 | return nfsd_fh_hashval(fh) & (FILE_HASH_SIZE - 1); | |
396 | } | |
397 | ||
398 | static struct hlist_head file_hashtbl[FILE_HASH_SIZE]; | |
399 | ||
400 | static void | |
401 | __nfs4_file_get_access(struct nfs4_file *fp, u32 access) | |
402 | { | |
403 | lockdep_assert_held(&fp->fi_lock); | |
404 | ||
405 | if (access & NFS4_SHARE_ACCESS_WRITE) | |
406 | atomic_inc(&fp->fi_access[O_WRONLY]); | |
407 | if (access & NFS4_SHARE_ACCESS_READ) | |
408 | atomic_inc(&fp->fi_access[O_RDONLY]); | |
409 | } | |
410 | ||
411 | static __be32 | |
412 | nfs4_file_get_access(struct nfs4_file *fp, u32 access) | |
413 | { | |
414 | lockdep_assert_held(&fp->fi_lock); | |
415 | ||
416 | /* Does this access mode make sense? */ | |
417 | if (access & ~NFS4_SHARE_ACCESS_BOTH) | |
418 | return nfserr_inval; | |
419 | ||
420 | /* Does it conflict with a deny mode already set? */ | |
421 | if ((access & fp->fi_share_deny) != 0) | |
422 | return nfserr_share_denied; | |
423 | ||
424 | __nfs4_file_get_access(fp, access); | |
425 | return nfs_ok; | |
426 | } | |
427 | ||
428 | static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny) | |
429 | { | |
430 | /* Common case is that there is no deny mode. */ | |
431 | if (deny) { | |
432 | /* Does this deny mode make sense? */ | |
433 | if (deny & ~NFS4_SHARE_DENY_BOTH) | |
434 | return nfserr_inval; | |
435 | ||
436 | if ((deny & NFS4_SHARE_DENY_READ) && | |
437 | atomic_read(&fp->fi_access[O_RDONLY])) | |
438 | return nfserr_share_denied; | |
439 | ||
440 | if ((deny & NFS4_SHARE_DENY_WRITE) && | |
441 | atomic_read(&fp->fi_access[O_WRONLY])) | |
442 | return nfserr_share_denied; | |
443 | } | |
444 | return nfs_ok; | |
445 | } | |
446 | ||
447 | static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag) | |
448 | { | |
449 | might_lock(&fp->fi_lock); | |
450 | ||
451 | if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) { | |
452 | struct file *f1 = NULL; | |
453 | struct file *f2 = NULL; | |
454 | ||
455 | swap(f1, fp->fi_fds[oflag]); | |
456 | if (atomic_read(&fp->fi_access[1 - oflag]) == 0) | |
457 | swap(f2, fp->fi_fds[O_RDWR]); | |
458 | spin_unlock(&fp->fi_lock); | |
459 | if (f1) | |
460 | fput(f1); | |
461 | if (f2) | |
462 | fput(f2); | |
463 | } | |
464 | } | |
465 | ||
466 | static void nfs4_file_put_access(struct nfs4_file *fp, u32 access) | |
467 | { | |
468 | WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH); | |
469 | ||
470 | if (access & NFS4_SHARE_ACCESS_WRITE) | |
471 | __nfs4_file_put_access(fp, O_WRONLY); | |
472 | if (access & NFS4_SHARE_ACCESS_READ) | |
473 | __nfs4_file_put_access(fp, O_RDONLY); | |
474 | } | |
475 | ||
476 | /* | |
477 | * Allocate a new open/delegation state counter. This is needed for | |
478 | * pNFS for proper return on close semantics. | |
479 | * | |
480 | * Note that we only allocate it for pNFS-enabled exports, otherwise | |
481 | * all pointers to struct nfs4_clnt_odstate are always NULL. | |
482 | */ | |
483 | static struct nfs4_clnt_odstate * | |
484 | alloc_clnt_odstate(struct nfs4_client *clp) | |
485 | { | |
486 | struct nfs4_clnt_odstate *co; | |
487 | ||
488 | co = kmem_cache_zalloc(odstate_slab, GFP_KERNEL); | |
489 | if (co) { | |
490 | co->co_client = clp; | |
491 | atomic_set(&co->co_odcount, 1); | |
492 | } | |
493 | return co; | |
494 | } | |
495 | ||
496 | static void | |
497 | hash_clnt_odstate_locked(struct nfs4_clnt_odstate *co) | |
498 | { | |
499 | struct nfs4_file *fp = co->co_file; | |
500 | ||
501 | lockdep_assert_held(&fp->fi_lock); | |
502 | list_add(&co->co_perfile, &fp->fi_clnt_odstate); | |
503 | } | |
504 | ||
505 | static inline void | |
506 | get_clnt_odstate(struct nfs4_clnt_odstate *co) | |
507 | { | |
508 | if (co) | |
509 | atomic_inc(&co->co_odcount); | |
510 | } | |
511 | ||
512 | static void | |
513 | put_clnt_odstate(struct nfs4_clnt_odstate *co) | |
514 | { | |
515 | struct nfs4_file *fp; | |
516 | ||
517 | if (!co) | |
518 | return; | |
519 | ||
520 | fp = co->co_file; | |
521 | if (atomic_dec_and_lock(&co->co_odcount, &fp->fi_lock)) { | |
522 | list_del(&co->co_perfile); | |
523 | spin_unlock(&fp->fi_lock); | |
524 | ||
525 | nfsd4_return_all_file_layouts(co->co_client, fp); | |
526 | kmem_cache_free(odstate_slab, co); | |
527 | } | |
528 | } | |
529 | ||
530 | static struct nfs4_clnt_odstate * | |
531 | find_or_hash_clnt_odstate(struct nfs4_file *fp, struct nfs4_clnt_odstate *new) | |
532 | { | |
533 | struct nfs4_clnt_odstate *co; | |
534 | struct nfs4_client *cl; | |
535 | ||
536 | if (!new) | |
537 | return NULL; | |
538 | ||
539 | cl = new->co_client; | |
540 | ||
541 | spin_lock(&fp->fi_lock); | |
542 | list_for_each_entry(co, &fp->fi_clnt_odstate, co_perfile) { | |
543 | if (co->co_client == cl) { | |
544 | get_clnt_odstate(co); | |
545 | goto out; | |
546 | } | |
547 | } | |
548 | co = new; | |
549 | co->co_file = fp; | |
550 | hash_clnt_odstate_locked(new); | |
551 | out: | |
552 | spin_unlock(&fp->fi_lock); | |
553 | return co; | |
554 | } | |
555 | ||
556 | struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, | |
557 | struct kmem_cache *slab) | |
558 | { | |
559 | struct nfs4_stid *stid; | |
560 | int new_id; | |
561 | ||
562 | stid = kmem_cache_zalloc(slab, GFP_KERNEL); | |
563 | if (!stid) | |
564 | return NULL; | |
565 | ||
566 | idr_preload(GFP_KERNEL); | |
567 | spin_lock(&cl->cl_lock); | |
568 | new_id = idr_alloc_cyclic(&cl->cl_stateids, stid, 0, 0, GFP_NOWAIT); | |
569 | spin_unlock(&cl->cl_lock); | |
570 | idr_preload_end(); | |
571 | if (new_id < 0) | |
572 | goto out_free; | |
573 | stid->sc_client = cl; | |
574 | stid->sc_stateid.si_opaque.so_id = new_id; | |
575 | stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid; | |
576 | /* Will be incremented before return to client: */ | |
577 | atomic_set(&stid->sc_count, 1); | |
578 | spin_lock_init(&stid->sc_lock); | |
579 | ||
580 | /* | |
581 | * It shouldn't be a problem to reuse an opaque stateid value. | |
582 | * I don't think it is for 4.1. But with 4.0 I worry that, for | |
583 | * example, a stray write retransmission could be accepted by | |
584 | * the server when it should have been rejected. Therefore, | |
585 | * adopt a trick from the sctp code to attempt to maximize the | |
586 | * amount of time until an id is reused, by ensuring they always | |
587 | * "increase" (mod INT_MAX): | |
588 | */ | |
589 | return stid; | |
590 | out_free: | |
591 | kmem_cache_free(slab, stid); | |
592 | return NULL; | |
593 | } | |
594 | ||
595 | static struct nfs4_ol_stateid * nfs4_alloc_open_stateid(struct nfs4_client *clp) | |
596 | { | |
597 | struct nfs4_stid *stid; | |
598 | struct nfs4_ol_stateid *stp; | |
599 | ||
600 | stid = nfs4_alloc_stid(clp, stateid_slab); | |
601 | if (!stid) | |
602 | return NULL; | |
603 | ||
604 | stp = openlockstateid(stid); | |
605 | stp->st_stid.sc_free = nfs4_free_ol_stateid; | |
606 | return stp; | |
607 | } | |
608 | ||
609 | static void nfs4_free_deleg(struct nfs4_stid *stid) | |
610 | { | |
611 | kmem_cache_free(deleg_slab, stid); | |
612 | atomic_long_dec(&num_delegations); | |
613 | } | |
614 | ||
615 | /* | |
616 | * When we recall a delegation, we should be careful not to hand it | |
617 | * out again straight away. | |
618 | * To ensure this we keep a pair of bloom filters ('new' and 'old') | |
619 | * in which the filehandles of recalled delegations are "stored". | |
620 | * If a filehandle appear in either filter, a delegation is blocked. | |
621 | * When a delegation is recalled, the filehandle is stored in the "new" | |
622 | * filter. | |
623 | * Every 30 seconds we swap the filters and clear the "new" one, | |
624 | * unless both are empty of course. | |
625 | * | |
626 | * Each filter is 256 bits. We hash the filehandle to 32bit and use the | |
627 | * low 3 bytes as hash-table indices. | |
628 | * | |
629 | * 'blocked_delegations_lock', which is always taken in block_delegations(), | |
630 | * is used to manage concurrent access. Testing does not need the lock | |
631 | * except when swapping the two filters. | |
632 | */ | |
633 | static DEFINE_SPINLOCK(blocked_delegations_lock); | |
634 | static struct bloom_pair { | |
635 | int entries, old_entries; | |
636 | time_t swap_time; | |
637 | int new; /* index into 'set' */ | |
638 | DECLARE_BITMAP(set[2], 256); | |
639 | } blocked_delegations; | |
640 | ||
641 | static int delegation_blocked(struct knfsd_fh *fh) | |
642 | { | |
643 | u32 hash; | |
644 | struct bloom_pair *bd = &blocked_delegations; | |
645 | ||
646 | if (bd->entries == 0) | |
647 | return 0; | |
648 | if (seconds_since_boot() - bd->swap_time > 30) { | |
649 | spin_lock(&blocked_delegations_lock); | |
650 | if (seconds_since_boot() - bd->swap_time > 30) { | |
651 | bd->entries -= bd->old_entries; | |
652 | bd->old_entries = bd->entries; | |
653 | memset(bd->set[bd->new], 0, | |
654 | sizeof(bd->set[0])); | |
655 | bd->new = 1-bd->new; | |
656 | bd->swap_time = seconds_since_boot(); | |
657 | } | |
658 | spin_unlock(&blocked_delegations_lock); | |
659 | } | |
660 | hash = jhash(&fh->fh_base, fh->fh_size, 0); | |
661 | if (test_bit(hash&255, bd->set[0]) && | |
662 | test_bit((hash>>8)&255, bd->set[0]) && | |
663 | test_bit((hash>>16)&255, bd->set[0])) | |
664 | return 1; | |
665 | ||
666 | if (test_bit(hash&255, bd->set[1]) && | |
667 | test_bit((hash>>8)&255, bd->set[1]) && | |
668 | test_bit((hash>>16)&255, bd->set[1])) | |
669 | return 1; | |
670 | ||
671 | return 0; | |
672 | } | |
673 | ||
674 | static void block_delegations(struct knfsd_fh *fh) | |
675 | { | |
676 | u32 hash; | |
677 | struct bloom_pair *bd = &blocked_delegations; | |
678 | ||
679 | hash = jhash(&fh->fh_base, fh->fh_size, 0); | |
680 | ||
681 | spin_lock(&blocked_delegations_lock); | |
682 | __set_bit(hash&255, bd->set[bd->new]); | |
683 | __set_bit((hash>>8)&255, bd->set[bd->new]); | |
684 | __set_bit((hash>>16)&255, bd->set[bd->new]); | |
685 | if (bd->entries == 0) | |
686 | bd->swap_time = seconds_since_boot(); | |
687 | bd->entries += 1; | |
688 | spin_unlock(&blocked_delegations_lock); | |
689 | } | |
690 | ||
691 | static struct nfs4_delegation * | |
692 | alloc_init_deleg(struct nfs4_client *clp, struct svc_fh *current_fh, | |
693 | struct nfs4_clnt_odstate *odstate) | |
694 | { | |
695 | struct nfs4_delegation *dp; | |
696 | long n; | |
697 | ||
698 | dprintk("NFSD alloc_init_deleg\n"); | |
699 | n = atomic_long_inc_return(&num_delegations); | |
700 | if (n < 0 || n > max_delegations) | |
701 | goto out_dec; | |
702 | if (delegation_blocked(¤t_fh->fh_handle)) | |
703 | goto out_dec; | |
704 | dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab)); | |
705 | if (dp == NULL) | |
706 | goto out_dec; | |
707 | ||
708 | dp->dl_stid.sc_free = nfs4_free_deleg; | |
709 | /* | |
710 | * delegation seqid's are never incremented. The 4.1 special | |
711 | * meaning of seqid 0 isn't meaningful, really, but let's avoid | |
712 | * 0 anyway just for consistency and use 1: | |
713 | */ | |
714 | dp->dl_stid.sc_stateid.si_generation = 1; | |
715 | INIT_LIST_HEAD(&dp->dl_perfile); | |
716 | INIT_LIST_HEAD(&dp->dl_perclnt); | |
717 | INIT_LIST_HEAD(&dp->dl_recall_lru); | |
718 | dp->dl_clnt_odstate = odstate; | |
719 | get_clnt_odstate(odstate); | |
720 | dp->dl_type = NFS4_OPEN_DELEGATE_READ; | |
721 | dp->dl_retries = 1; | |
722 | nfsd4_init_cb(&dp->dl_recall, dp->dl_stid.sc_client, | |
723 | &nfsd4_cb_recall_ops, NFSPROC4_CLNT_CB_RECALL); | |
724 | return dp; | |
725 | out_dec: | |
726 | atomic_long_dec(&num_delegations); | |
727 | return NULL; | |
728 | } | |
729 | ||
730 | void | |
731 | nfs4_put_stid(struct nfs4_stid *s) | |
732 | { | |
733 | struct nfs4_file *fp = s->sc_file; | |
734 | struct nfs4_client *clp = s->sc_client; | |
735 | ||
736 | might_lock(&clp->cl_lock); | |
737 | ||
738 | if (!atomic_dec_and_lock(&s->sc_count, &clp->cl_lock)) { | |
739 | wake_up_all(&close_wq); | |
740 | return; | |
741 | } | |
742 | idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id); | |
743 | spin_unlock(&clp->cl_lock); | |
744 | s->sc_free(s); | |
745 | if (fp) | |
746 | put_nfs4_file(fp); | |
747 | } | |
748 | ||
749 | void | |
750 | nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid) | |
751 | { | |
752 | stateid_t *src = &stid->sc_stateid; | |
753 | ||
754 | spin_lock(&stid->sc_lock); | |
755 | if (unlikely(++src->si_generation == 0)) | |
756 | src->si_generation = 1; | |
757 | memcpy(dst, src, sizeof(*dst)); | |
758 | spin_unlock(&stid->sc_lock); | |
759 | } | |
760 | ||
761 | static void nfs4_put_deleg_lease(struct nfs4_file *fp) | |
762 | { | |
763 | struct file *filp = NULL; | |
764 | ||
765 | spin_lock(&fp->fi_lock); | |
766 | if (fp->fi_deleg_file && --fp->fi_delegees == 0) | |
767 | swap(filp, fp->fi_deleg_file); | |
768 | spin_unlock(&fp->fi_lock); | |
769 | ||
770 | if (filp) { | |
771 | vfs_setlease(filp, F_UNLCK, NULL, (void **)&fp); | |
772 | fput(filp); | |
773 | } | |
774 | } | |
775 | ||
776 | void nfs4_unhash_stid(struct nfs4_stid *s) | |
777 | { | |
778 | s->sc_type = 0; | |
779 | } | |
780 | ||
781 | /** | |
782 | * nfs4_get_existing_delegation - Discover if this delegation already exists | |
783 | * @clp: a pointer to the nfs4_client we're granting a delegation to | |
784 | * @fp: a pointer to the nfs4_file we're granting a delegation on | |
785 | * | |
786 | * Return: | |
787 | * On success: NULL if an existing delegation was not found. | |
788 | * | |
789 | * On error: -EAGAIN if one was previously granted to this nfs4_client | |
790 | * for this nfs4_file. | |
791 | * | |
792 | */ | |
793 | ||
794 | static int | |
795 | nfs4_get_existing_delegation(struct nfs4_client *clp, struct nfs4_file *fp) | |
796 | { | |
797 | struct nfs4_delegation *searchdp = NULL; | |
798 | struct nfs4_client *searchclp = NULL; | |
799 | ||
800 | lockdep_assert_held(&state_lock); | |
801 | lockdep_assert_held(&fp->fi_lock); | |
802 | ||
803 | list_for_each_entry(searchdp, &fp->fi_delegations, dl_perfile) { | |
804 | searchclp = searchdp->dl_stid.sc_client; | |
805 | if (clp == searchclp) { | |
806 | return -EAGAIN; | |
807 | } | |
808 | } | |
809 | return 0; | |
810 | } | |
811 | ||
812 | /** | |
813 | * hash_delegation_locked - Add a delegation to the appropriate lists | |
814 | * @dp: a pointer to the nfs4_delegation we are adding. | |
815 | * @fp: a pointer to the nfs4_file we're granting a delegation on | |
816 | * | |
817 | * Return: | |
818 | * On success: NULL if the delegation was successfully hashed. | |
819 | * | |
820 | * On error: -EAGAIN if one was previously granted to this | |
821 | * nfs4_client for this nfs4_file. Delegation is not hashed. | |
822 | * | |
823 | */ | |
824 | ||
825 | static int | |
826 | hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp) | |
827 | { | |
828 | int status; | |
829 | struct nfs4_client *clp = dp->dl_stid.sc_client; | |
830 | ||
831 | lockdep_assert_held(&state_lock); | |
832 | lockdep_assert_held(&fp->fi_lock); | |
833 | ||
834 | status = nfs4_get_existing_delegation(clp, fp); | |
835 | if (status) | |
836 | return status; | |
837 | ++fp->fi_delegees; | |
838 | atomic_inc(&dp->dl_stid.sc_count); | |
839 | dp->dl_stid.sc_type = NFS4_DELEG_STID; | |
840 | list_add(&dp->dl_perfile, &fp->fi_delegations); | |
841 | list_add(&dp->dl_perclnt, &clp->cl_delegations); | |
842 | return 0; | |
843 | } | |
844 | ||
845 | static bool | |
846 | unhash_delegation_locked(struct nfs4_delegation *dp) | |
847 | { | |
848 | struct nfs4_file *fp = dp->dl_stid.sc_file; | |
849 | ||
850 | lockdep_assert_held(&state_lock); | |
851 | ||
852 | if (list_empty(&dp->dl_perfile)) | |
853 | return false; | |
854 | ||
855 | dp->dl_stid.sc_type = NFS4_CLOSED_DELEG_STID; | |
856 | /* Ensure that deleg break won't try to requeue it */ | |
857 | ++dp->dl_time; | |
858 | spin_lock(&fp->fi_lock); | |
859 | list_del_init(&dp->dl_perclnt); | |
860 | list_del_init(&dp->dl_recall_lru); | |
861 | list_del_init(&dp->dl_perfile); | |
862 | spin_unlock(&fp->fi_lock); | |
863 | return true; | |
864 | } | |
865 | ||
866 | static void destroy_delegation(struct nfs4_delegation *dp) | |
867 | { | |
868 | bool unhashed; | |
869 | ||
870 | spin_lock(&state_lock); | |
871 | unhashed = unhash_delegation_locked(dp); | |
872 | spin_unlock(&state_lock); | |
873 | if (unhashed) { | |
874 | put_clnt_odstate(dp->dl_clnt_odstate); | |
875 | nfs4_put_deleg_lease(dp->dl_stid.sc_file); | |
876 | nfs4_put_stid(&dp->dl_stid); | |
877 | } | |
878 | } | |
879 | ||
880 | static void revoke_delegation(struct nfs4_delegation *dp) | |
881 | { | |
882 | struct nfs4_client *clp = dp->dl_stid.sc_client; | |
883 | ||
884 | WARN_ON(!list_empty(&dp->dl_recall_lru)); | |
885 | ||
886 | put_clnt_odstate(dp->dl_clnt_odstate); | |
887 | nfs4_put_deleg_lease(dp->dl_stid.sc_file); | |
888 | ||
889 | if (clp->cl_minorversion == 0) | |
890 | nfs4_put_stid(&dp->dl_stid); | |
891 | else { | |
892 | dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID; | |
893 | spin_lock(&clp->cl_lock); | |
894 | list_add(&dp->dl_recall_lru, &clp->cl_revoked); | |
895 | spin_unlock(&clp->cl_lock); | |
896 | } | |
897 | } | |
898 | ||
899 | /* | |
900 | * SETCLIENTID state | |
901 | */ | |
902 | ||
903 | static unsigned int clientid_hashval(u32 id) | |
904 | { | |
905 | return id & CLIENT_HASH_MASK; | |
906 | } | |
907 | ||
908 | static unsigned int clientstr_hashval(const char *name) | |
909 | { | |
910 | return opaque_hashval(name, 8) & CLIENT_HASH_MASK; | |
911 | } | |
912 | ||
913 | /* | |
914 | * We store the NONE, READ, WRITE, and BOTH bits separately in the | |
915 | * st_{access,deny}_bmap field of the stateid, in order to track not | |
916 | * only what share bits are currently in force, but also what | |
917 | * combinations of share bits previous opens have used. This allows us | |
918 | * to enforce the recommendation of rfc 3530 14.2.19 that the server | |
919 | * return an error if the client attempt to downgrade to a combination | |
920 | * of share bits not explicable by closing some of its previous opens. | |
921 | * | |
922 | * XXX: This enforcement is actually incomplete, since we don't keep | |
923 | * track of access/deny bit combinations; so, e.g., we allow: | |
924 | * | |
925 | * OPEN allow read, deny write | |
926 | * OPEN allow both, deny none | |
927 | * DOWNGRADE allow read, deny none | |
928 | * | |
929 | * which we should reject. | |
930 | */ | |
931 | static unsigned int | |
932 | bmap_to_share_mode(unsigned long bmap) { | |
933 | int i; | |
934 | unsigned int access = 0; | |
935 | ||
936 | for (i = 1; i < 4; i++) { | |
937 | if (test_bit(i, &bmap)) | |
938 | access |= i; | |
939 | } | |
940 | return access; | |
941 | } | |
942 | ||
943 | /* set share access for a given stateid */ | |
944 | static inline void | |
945 | set_access(u32 access, struct nfs4_ol_stateid *stp) | |
946 | { | |
947 | unsigned char mask = 1 << access; | |
948 | ||
949 | WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH); | |
950 | stp->st_access_bmap |= mask; | |
951 | } | |
952 | ||
953 | /* clear share access for a given stateid */ | |
954 | static inline void | |
955 | clear_access(u32 access, struct nfs4_ol_stateid *stp) | |
956 | { | |
957 | unsigned char mask = 1 << access; | |
958 | ||
959 | WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH); | |
960 | stp->st_access_bmap &= ~mask; | |
961 | } | |
962 | ||
963 | /* test whether a given stateid has access */ | |
964 | static inline bool | |
965 | test_access(u32 access, struct nfs4_ol_stateid *stp) | |
966 | { | |
967 | unsigned char mask = 1 << access; | |
968 | ||
969 | return (bool)(stp->st_access_bmap & mask); | |
970 | } | |
971 | ||
972 | /* set share deny for a given stateid */ | |
973 | static inline void | |
974 | set_deny(u32 deny, struct nfs4_ol_stateid *stp) | |
975 | { | |
976 | unsigned char mask = 1 << deny; | |
977 | ||
978 | WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH); | |
979 | stp->st_deny_bmap |= mask; | |
980 | } | |
981 | ||
982 | /* clear share deny for a given stateid */ | |
983 | static inline void | |
984 | clear_deny(u32 deny, struct nfs4_ol_stateid *stp) | |
985 | { | |
986 | unsigned char mask = 1 << deny; | |
987 | ||
988 | WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH); | |
989 | stp->st_deny_bmap &= ~mask; | |
990 | } | |
991 | ||
992 | /* test whether a given stateid is denying specific access */ | |
993 | static inline bool | |
994 | test_deny(u32 deny, struct nfs4_ol_stateid *stp) | |
995 | { | |
996 | unsigned char mask = 1 << deny; | |
997 | ||
998 | return (bool)(stp->st_deny_bmap & mask); | |
999 | } | |
1000 | ||
1001 | static int nfs4_access_to_omode(u32 access) | |
1002 | { | |
1003 | switch (access & NFS4_SHARE_ACCESS_BOTH) { | |
1004 | case NFS4_SHARE_ACCESS_READ: | |
1005 | return O_RDONLY; | |
1006 | case NFS4_SHARE_ACCESS_WRITE: | |
1007 | return O_WRONLY; | |
1008 | case NFS4_SHARE_ACCESS_BOTH: | |
1009 | return O_RDWR; | |
1010 | } | |
1011 | WARN_ON_ONCE(1); | |
1012 | return O_RDONLY; | |
1013 | } | |
1014 | ||
1015 | /* | |
1016 | * A stateid that had a deny mode associated with it is being released | |
1017 | * or downgraded. Recalculate the deny mode on the file. | |
1018 | */ | |
1019 | static void | |
1020 | recalculate_deny_mode(struct nfs4_file *fp) | |
1021 | { | |
1022 | struct nfs4_ol_stateid *stp; | |
1023 | ||
1024 | spin_lock(&fp->fi_lock); | |
1025 | fp->fi_share_deny = 0; | |
1026 | list_for_each_entry(stp, &fp->fi_stateids, st_perfile) | |
1027 | fp->fi_share_deny |= bmap_to_share_mode(stp->st_deny_bmap); | |
1028 | spin_unlock(&fp->fi_lock); | |
1029 | } | |
1030 | ||
1031 | static void | |
1032 | reset_union_bmap_deny(u32 deny, struct nfs4_ol_stateid *stp) | |
1033 | { | |
1034 | int i; | |
1035 | bool change = false; | |
1036 | ||
1037 | for (i = 1; i < 4; i++) { | |
1038 | if ((i & deny) != i) { | |
1039 | change = true; | |
1040 | clear_deny(i, stp); | |
1041 | } | |
1042 | } | |
1043 | ||
1044 | /* Recalculate per-file deny mode if there was a change */ | |
1045 | if (change) | |
1046 | recalculate_deny_mode(stp->st_stid.sc_file); | |
1047 | } | |
1048 | ||
1049 | /* release all access and file references for a given stateid */ | |
1050 | static void | |
1051 | release_all_access(struct nfs4_ol_stateid *stp) | |
1052 | { | |
1053 | int i; | |
1054 | struct nfs4_file *fp = stp->st_stid.sc_file; | |
1055 | ||
1056 | if (fp && stp->st_deny_bmap != 0) | |
1057 | recalculate_deny_mode(fp); | |
1058 | ||
1059 | for (i = 1; i < 4; i++) { | |
1060 | if (test_access(i, stp)) | |
1061 | nfs4_file_put_access(stp->st_stid.sc_file, i); | |
1062 | clear_access(i, stp); | |
1063 | } | |
1064 | } | |
1065 | ||
1066 | static inline void nfs4_free_stateowner(struct nfs4_stateowner *sop) | |
1067 | { | |
1068 | kfree(sop->so_owner.data); | |
1069 | sop->so_ops->so_free(sop); | |
1070 | } | |
1071 | ||
1072 | static void nfs4_put_stateowner(struct nfs4_stateowner *sop) | |
1073 | { | |
1074 | struct nfs4_client *clp = sop->so_client; | |
1075 | ||
1076 | might_lock(&clp->cl_lock); | |
1077 | ||
1078 | if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock)) | |
1079 | return; | |
1080 | sop->so_ops->so_unhash(sop); | |
1081 | spin_unlock(&clp->cl_lock); | |
1082 | nfs4_free_stateowner(sop); | |
1083 | } | |
1084 | ||
1085 | static bool unhash_ol_stateid(struct nfs4_ol_stateid *stp) | |
1086 | { | |
1087 | struct nfs4_file *fp = stp->st_stid.sc_file; | |
1088 | ||
1089 | lockdep_assert_held(&stp->st_stateowner->so_client->cl_lock); | |
1090 | ||
1091 | if (list_empty(&stp->st_perfile)) | |
1092 | return false; | |
1093 | ||
1094 | spin_lock(&fp->fi_lock); | |
1095 | list_del_init(&stp->st_perfile); | |
1096 | spin_unlock(&fp->fi_lock); | |
1097 | list_del(&stp->st_perstateowner); | |
1098 | return true; | |
1099 | } | |
1100 | ||
1101 | static void nfs4_free_ol_stateid(struct nfs4_stid *stid) | |
1102 | { | |
1103 | struct nfs4_ol_stateid *stp = openlockstateid(stid); | |
1104 | ||
1105 | put_clnt_odstate(stp->st_clnt_odstate); | |
1106 | release_all_access(stp); | |
1107 | if (stp->st_stateowner) | |
1108 | nfs4_put_stateowner(stp->st_stateowner); | |
1109 | kmem_cache_free(stateid_slab, stid); | |
1110 | } | |
1111 | ||
1112 | static void nfs4_free_lock_stateid(struct nfs4_stid *stid) | |
1113 | { | |
1114 | struct nfs4_ol_stateid *stp = openlockstateid(stid); | |
1115 | struct nfs4_lockowner *lo = lockowner(stp->st_stateowner); | |
1116 | struct file *file; | |
1117 | ||
1118 | file = find_any_file(stp->st_stid.sc_file); | |
1119 | if (file) | |
1120 | filp_close(file, (fl_owner_t)lo); | |
1121 | nfs4_free_ol_stateid(stid); | |
1122 | } | |
1123 | ||
1124 | /* | |
1125 | * Put the persistent reference to an already unhashed generic stateid, while | |
1126 | * holding the cl_lock. If it's the last reference, then put it onto the | |
1127 | * reaplist for later destruction. | |
1128 | */ | |
1129 | static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp, | |
1130 | struct list_head *reaplist) | |
1131 | { | |
1132 | struct nfs4_stid *s = &stp->st_stid; | |
1133 | struct nfs4_client *clp = s->sc_client; | |
1134 | ||
1135 | lockdep_assert_held(&clp->cl_lock); | |
1136 | ||
1137 | WARN_ON_ONCE(!list_empty(&stp->st_locks)); | |
1138 | ||
1139 | if (!atomic_dec_and_test(&s->sc_count)) { | |
1140 | wake_up_all(&close_wq); | |
1141 | return; | |
1142 | } | |
1143 | ||
1144 | idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id); | |
1145 | list_add(&stp->st_locks, reaplist); | |
1146 | } | |
1147 | ||
1148 | static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp) | |
1149 | { | |
1150 | struct nfs4_openowner *oo = openowner(stp->st_openstp->st_stateowner); | |
1151 | ||
1152 | lockdep_assert_held(&oo->oo_owner.so_client->cl_lock); | |
1153 | ||
1154 | list_del_init(&stp->st_locks); | |
1155 | nfs4_unhash_stid(&stp->st_stid); | |
1156 | return unhash_ol_stateid(stp); | |
1157 | } | |
1158 | ||
1159 | static void release_lock_stateid(struct nfs4_ol_stateid *stp) | |
1160 | { | |
1161 | struct nfs4_openowner *oo = openowner(stp->st_openstp->st_stateowner); | |
1162 | bool unhashed; | |
1163 | ||
1164 | spin_lock(&oo->oo_owner.so_client->cl_lock); | |
1165 | unhashed = unhash_lock_stateid(stp); | |
1166 | spin_unlock(&oo->oo_owner.so_client->cl_lock); | |
1167 | if (unhashed) | |
1168 | nfs4_put_stid(&stp->st_stid); | |
1169 | } | |
1170 | ||
1171 | static void unhash_lockowner_locked(struct nfs4_lockowner *lo) | |
1172 | { | |
1173 | struct nfs4_client *clp = lo->lo_owner.so_client; | |
1174 | ||
1175 | lockdep_assert_held(&clp->cl_lock); | |
1176 | ||
1177 | list_del_init(&lo->lo_owner.so_strhash); | |
1178 | } | |
1179 | ||
1180 | /* | |
1181 | * Free a list of generic stateids that were collected earlier after being | |
1182 | * fully unhashed. | |
1183 | */ | |
1184 | static void | |
1185 | free_ol_stateid_reaplist(struct list_head *reaplist) | |
1186 | { | |
1187 | struct nfs4_ol_stateid *stp; | |
1188 | struct nfs4_file *fp; | |
1189 | ||
1190 | might_sleep(); | |
1191 | ||
1192 | while (!list_empty(reaplist)) { | |
1193 | stp = list_first_entry(reaplist, struct nfs4_ol_stateid, | |
1194 | st_locks); | |
1195 | list_del(&stp->st_locks); | |
1196 | fp = stp->st_stid.sc_file; | |
1197 | stp->st_stid.sc_free(&stp->st_stid); | |
1198 | if (fp) | |
1199 | put_nfs4_file(fp); | |
1200 | } | |
1201 | } | |
1202 | ||
1203 | static void release_lockowner(struct nfs4_lockowner *lo) | |
1204 | { | |
1205 | struct nfs4_client *clp = lo->lo_owner.so_client; | |
1206 | struct nfs4_ol_stateid *stp; | |
1207 | struct list_head reaplist; | |
1208 | ||
1209 | INIT_LIST_HEAD(&reaplist); | |
1210 | ||
1211 | spin_lock(&clp->cl_lock); | |
1212 | unhash_lockowner_locked(lo); | |
1213 | while (!list_empty(&lo->lo_owner.so_stateids)) { | |
1214 | stp = list_first_entry(&lo->lo_owner.so_stateids, | |
1215 | struct nfs4_ol_stateid, st_perstateowner); | |
1216 | WARN_ON(!unhash_lock_stateid(stp)); | |
1217 | put_ol_stateid_locked(stp, &reaplist); | |
1218 | } | |
1219 | spin_unlock(&clp->cl_lock); | |
1220 | free_ol_stateid_reaplist(&reaplist); | |
1221 | nfs4_put_stateowner(&lo->lo_owner); | |
1222 | } | |
1223 | ||
1224 | static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp, | |
1225 | struct list_head *reaplist) | |
1226 | { | |
1227 | struct nfs4_ol_stateid *stp; | |
1228 | ||
1229 | lockdep_assert_held(&open_stp->st_stid.sc_client->cl_lock); | |
1230 | ||
1231 | while (!list_empty(&open_stp->st_locks)) { | |
1232 | stp = list_entry(open_stp->st_locks.next, | |
1233 | struct nfs4_ol_stateid, st_locks); | |
1234 | WARN_ON(!unhash_lock_stateid(stp)); | |
1235 | put_ol_stateid_locked(stp, reaplist); | |
1236 | } | |
1237 | } | |
1238 | ||
1239 | static bool unhash_open_stateid(struct nfs4_ol_stateid *stp, | |
1240 | struct list_head *reaplist) | |
1241 | { | |
1242 | bool unhashed; | |
1243 | ||
1244 | lockdep_assert_held(&stp->st_stid.sc_client->cl_lock); | |
1245 | ||
1246 | unhashed = unhash_ol_stateid(stp); | |
1247 | release_open_stateid_locks(stp, reaplist); | |
1248 | return unhashed; | |
1249 | } | |
1250 | ||
1251 | static void release_open_stateid(struct nfs4_ol_stateid *stp) | |
1252 | { | |
1253 | LIST_HEAD(reaplist); | |
1254 | ||
1255 | spin_lock(&stp->st_stid.sc_client->cl_lock); | |
1256 | if (unhash_open_stateid(stp, &reaplist)) | |
1257 | put_ol_stateid_locked(stp, &reaplist); | |
1258 | spin_unlock(&stp->st_stid.sc_client->cl_lock); | |
1259 | free_ol_stateid_reaplist(&reaplist); | |
1260 | } | |
1261 | ||
1262 | static void unhash_openowner_locked(struct nfs4_openowner *oo) | |
1263 | { | |
1264 | struct nfs4_client *clp = oo->oo_owner.so_client; | |
1265 | ||
1266 | lockdep_assert_held(&clp->cl_lock); | |
1267 | ||
1268 | list_del_init(&oo->oo_owner.so_strhash); | |
1269 | list_del_init(&oo->oo_perclient); | |
1270 | } | |
1271 | ||
1272 | static void release_last_closed_stateid(struct nfs4_openowner *oo) | |
1273 | { | |
1274 | struct nfsd_net *nn = net_generic(oo->oo_owner.so_client->net, | |
1275 | nfsd_net_id); | |
1276 | struct nfs4_ol_stateid *s; | |
1277 | ||
1278 | spin_lock(&nn->client_lock); | |
1279 | s = oo->oo_last_closed_stid; | |
1280 | if (s) { | |
1281 | list_del_init(&oo->oo_close_lru); | |
1282 | oo->oo_last_closed_stid = NULL; | |
1283 | } | |
1284 | spin_unlock(&nn->client_lock); | |
1285 | if (s) | |
1286 | nfs4_put_stid(&s->st_stid); | |
1287 | } | |
1288 | ||
1289 | static void release_openowner(struct nfs4_openowner *oo) | |
1290 | { | |
1291 | struct nfs4_ol_stateid *stp; | |
1292 | struct nfs4_client *clp = oo->oo_owner.so_client; | |
1293 | struct list_head reaplist; | |
1294 | ||
1295 | INIT_LIST_HEAD(&reaplist); | |
1296 | ||
1297 | spin_lock(&clp->cl_lock); | |
1298 | unhash_openowner_locked(oo); | |
1299 | while (!list_empty(&oo->oo_owner.so_stateids)) { | |
1300 | stp = list_first_entry(&oo->oo_owner.so_stateids, | |
1301 | struct nfs4_ol_stateid, st_perstateowner); | |
1302 | if (unhash_open_stateid(stp, &reaplist)) | |
1303 | put_ol_stateid_locked(stp, &reaplist); | |
1304 | } | |
1305 | spin_unlock(&clp->cl_lock); | |
1306 | free_ol_stateid_reaplist(&reaplist); | |
1307 | release_last_closed_stateid(oo); | |
1308 | nfs4_put_stateowner(&oo->oo_owner); | |
1309 | } | |
1310 | ||
1311 | static inline int | |
1312 | hash_sessionid(struct nfs4_sessionid *sessionid) | |
1313 | { | |
1314 | struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid; | |
1315 | ||
1316 | return sid->sequence % SESSION_HASH_SIZE; | |
1317 | } | |
1318 | ||
1319 | #ifdef CONFIG_SUNRPC_DEBUG | |
1320 | static inline void | |
1321 | dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid) | |
1322 | { | |
1323 | u32 *ptr = (u32 *)(&sessionid->data[0]); | |
1324 | dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]); | |
1325 | } | |
1326 | #else | |
1327 | static inline void | |
1328 | dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid) | |
1329 | { | |
1330 | } | |
1331 | #endif | |
1332 | ||
1333 | /* | |
1334 | * Bump the seqid on cstate->replay_owner, and clear replay_owner if it | |
1335 | * won't be used for replay. | |
1336 | */ | |
1337 | void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr) | |
1338 | { | |
1339 | struct nfs4_stateowner *so = cstate->replay_owner; | |
1340 | ||
1341 | if (nfserr == nfserr_replay_me) | |
1342 | return; | |
1343 | ||
1344 | if (!seqid_mutating_err(ntohl(nfserr))) { | |
1345 | nfsd4_cstate_clear_replay(cstate); | |
1346 | return; | |
1347 | } | |
1348 | if (!so) | |
1349 | return; | |
1350 | if (so->so_is_open_owner) | |
1351 | release_last_closed_stateid(openowner(so)); | |
1352 | so->so_seqid++; | |
1353 | return; | |
1354 | } | |
1355 | ||
1356 | static void | |
1357 | gen_sessionid(struct nfsd4_session *ses) | |
1358 | { | |
1359 | struct nfs4_client *clp = ses->se_client; | |
1360 | struct nfsd4_sessionid *sid; | |
1361 | ||
1362 | sid = (struct nfsd4_sessionid *)ses->se_sessionid.data; | |
1363 | sid->clientid = clp->cl_clientid; | |
1364 | sid->sequence = current_sessionid++; | |
1365 | sid->reserved = 0; | |
1366 | } | |
1367 | ||
1368 | /* | |
1369 | * The protocol defines ca_maxresponssize_cached to include the size of | |
1370 | * the rpc header, but all we need to cache is the data starting after | |
1371 | * the end of the initial SEQUENCE operation--the rest we regenerate | |
1372 | * each time. Therefore we can advertise a ca_maxresponssize_cached | |
1373 | * value that is the number of bytes in our cache plus a few additional | |
1374 | * bytes. In order to stay on the safe side, and not promise more than | |
1375 | * we can cache, those additional bytes must be the minimum possible: 24 | |
1376 | * bytes of rpc header (xid through accept state, with AUTH_NULL | |
1377 | * verifier), 12 for the compound header (with zero-length tag), and 44 | |
1378 | * for the SEQUENCE op response: | |
1379 | */ | |
1380 | #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44) | |
1381 | ||
1382 | static void | |
1383 | free_session_slots(struct nfsd4_session *ses) | |
1384 | { | |
1385 | int i; | |
1386 | ||
1387 | for (i = 0; i < ses->se_fchannel.maxreqs; i++) | |
1388 | kfree(ses->se_slots[i]); | |
1389 | } | |
1390 | ||
1391 | /* | |
1392 | * We don't actually need to cache the rpc and session headers, so we | |
1393 | * can allocate a little less for each slot: | |
1394 | */ | |
1395 | static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca) | |
1396 | { | |
1397 | u32 size; | |
1398 | ||
1399 | if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ) | |
1400 | size = 0; | |
1401 | else | |
1402 | size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ; | |
1403 | return size + sizeof(struct nfsd4_slot); | |
1404 | } | |
1405 | ||
1406 | /* | |
1407 | * XXX: If we run out of reserved DRC memory we could (up to a point) | |
1408 | * re-negotiate active sessions and reduce their slot usage to make | |
1409 | * room for new connections. For now we just fail the create session. | |
1410 | */ | |
1411 | static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca) | |
1412 | { | |
1413 | u32 slotsize = slot_bytes(ca); | |
1414 | u32 num = ca->maxreqs; | |
1415 | int avail; | |
1416 | ||
1417 | spin_lock(&nfsd_drc_lock); | |
1418 | avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION, | |
1419 | nfsd_drc_max_mem - nfsd_drc_mem_used); | |
1420 | num = min_t(int, num, avail / slotsize); | |
1421 | nfsd_drc_mem_used += num * slotsize; | |
1422 | spin_unlock(&nfsd_drc_lock); | |
1423 | ||
1424 | return num; | |
1425 | } | |
1426 | ||
1427 | static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca) | |
1428 | { | |
1429 | int slotsize = slot_bytes(ca); | |
1430 | ||
1431 | spin_lock(&nfsd_drc_lock); | |
1432 | nfsd_drc_mem_used -= slotsize * ca->maxreqs; | |
1433 | spin_unlock(&nfsd_drc_lock); | |
1434 | } | |
1435 | ||
1436 | static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs, | |
1437 | struct nfsd4_channel_attrs *battrs) | |
1438 | { | |
1439 | int numslots = fattrs->maxreqs; | |
1440 | int slotsize = slot_bytes(fattrs); | |
1441 | struct nfsd4_session *new; | |
1442 | int mem, i; | |
1443 | ||
1444 | BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *) | |
1445 | + sizeof(struct nfsd4_session) > PAGE_SIZE); | |
1446 | mem = numslots * sizeof(struct nfsd4_slot *); | |
1447 | ||
1448 | new = kzalloc(sizeof(*new) + mem, GFP_KERNEL); | |
1449 | if (!new) | |
1450 | return NULL; | |
1451 | /* allocate each struct nfsd4_slot and data cache in one piece */ | |
1452 | for (i = 0; i < numslots; i++) { | |
1453 | new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL); | |
1454 | if (!new->se_slots[i]) | |
1455 | goto out_free; | |
1456 | } | |
1457 | ||
1458 | memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs)); | |
1459 | memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs)); | |
1460 | ||
1461 | return new; | |
1462 | out_free: | |
1463 | while (i--) | |
1464 | kfree(new->se_slots[i]); | |
1465 | kfree(new); | |
1466 | return NULL; | |
1467 | } | |
1468 | ||
1469 | static void free_conn(struct nfsd4_conn *c) | |
1470 | { | |
1471 | svc_xprt_put(c->cn_xprt); | |
1472 | kfree(c); | |
1473 | } | |
1474 | ||
1475 | static void nfsd4_conn_lost(struct svc_xpt_user *u) | |
1476 | { | |
1477 | struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user); | |
1478 | struct nfs4_client *clp = c->cn_session->se_client; | |
1479 | ||
1480 | spin_lock(&clp->cl_lock); | |
1481 | if (!list_empty(&c->cn_persession)) { | |
1482 | list_del(&c->cn_persession); | |
1483 | free_conn(c); | |
1484 | } | |
1485 | nfsd4_probe_callback(clp); | |
1486 | spin_unlock(&clp->cl_lock); | |
1487 | } | |
1488 | ||
1489 | static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags) | |
1490 | { | |
1491 | struct nfsd4_conn *conn; | |
1492 | ||
1493 | conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL); | |
1494 | if (!conn) | |
1495 | return NULL; | |
1496 | svc_xprt_get(rqstp->rq_xprt); | |
1497 | conn->cn_xprt = rqstp->rq_xprt; | |
1498 | conn->cn_flags = flags; | |
1499 | INIT_LIST_HEAD(&conn->cn_xpt_user.list); | |
1500 | return conn; | |
1501 | } | |
1502 | ||
1503 | static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses) | |
1504 | { | |
1505 | conn->cn_session = ses; | |
1506 | list_add(&conn->cn_persession, &ses->se_conns); | |
1507 | } | |
1508 | ||
1509 | static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses) | |
1510 | { | |
1511 | struct nfs4_client *clp = ses->se_client; | |
1512 | ||
1513 | spin_lock(&clp->cl_lock); | |
1514 | __nfsd4_hash_conn(conn, ses); | |
1515 | spin_unlock(&clp->cl_lock); | |
1516 | } | |
1517 | ||
1518 | static int nfsd4_register_conn(struct nfsd4_conn *conn) | |
1519 | { | |
1520 | conn->cn_xpt_user.callback = nfsd4_conn_lost; | |
1521 | return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user); | |
1522 | } | |
1523 | ||
1524 | static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses) | |
1525 | { | |
1526 | int ret; | |
1527 | ||
1528 | nfsd4_hash_conn(conn, ses); | |
1529 | ret = nfsd4_register_conn(conn); | |
1530 | if (ret) | |
1531 | /* oops; xprt is already down: */ | |
1532 | nfsd4_conn_lost(&conn->cn_xpt_user); | |
1533 | /* We may have gained or lost a callback channel: */ | |
1534 | nfsd4_probe_callback_sync(ses->se_client); | |
1535 | } | |
1536 | ||
1537 | static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses) | |
1538 | { | |
1539 | u32 dir = NFS4_CDFC4_FORE; | |
1540 | ||
1541 | if (cses->flags & SESSION4_BACK_CHAN) | |
1542 | dir |= NFS4_CDFC4_BACK; | |
1543 | return alloc_conn(rqstp, dir); | |
1544 | } | |
1545 | ||
1546 | /* must be called under client_lock */ | |
1547 | static void nfsd4_del_conns(struct nfsd4_session *s) | |
1548 | { | |
1549 | struct nfs4_client *clp = s->se_client; | |
1550 | struct nfsd4_conn *c; | |
1551 | ||
1552 | spin_lock(&clp->cl_lock); | |
1553 | while (!list_empty(&s->se_conns)) { | |
1554 | c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession); | |
1555 | list_del_init(&c->cn_persession); | |
1556 | spin_unlock(&clp->cl_lock); | |
1557 | ||
1558 | unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user); | |
1559 | free_conn(c); | |
1560 | ||
1561 | spin_lock(&clp->cl_lock); | |
1562 | } | |
1563 | spin_unlock(&clp->cl_lock); | |
1564 | } | |
1565 | ||
1566 | static void __free_session(struct nfsd4_session *ses) | |
1567 | { | |
1568 | free_session_slots(ses); | |
1569 | kfree(ses); | |
1570 | } | |
1571 | ||
1572 | static void free_session(struct nfsd4_session *ses) | |
1573 | { | |
1574 | nfsd4_del_conns(ses); | |
1575 | nfsd4_put_drc_mem(&ses->se_fchannel); | |
1576 | __free_session(ses); | |
1577 | } | |
1578 | ||
1579 | static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses) | |
1580 | { | |
1581 | int idx; | |
1582 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
1583 | ||
1584 | new->se_client = clp; | |
1585 | gen_sessionid(new); | |
1586 | ||
1587 | INIT_LIST_HEAD(&new->se_conns); | |
1588 | ||
1589 | new->se_cb_seq_nr = 1; | |
1590 | new->se_flags = cses->flags; | |
1591 | new->se_cb_prog = cses->callback_prog; | |
1592 | new->se_cb_sec = cses->cb_sec; | |
1593 | atomic_set(&new->se_ref, 0); | |
1594 | idx = hash_sessionid(&new->se_sessionid); | |
1595 | list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]); | |
1596 | spin_lock(&clp->cl_lock); | |
1597 | list_add(&new->se_perclnt, &clp->cl_sessions); | |
1598 | spin_unlock(&clp->cl_lock); | |
1599 | ||
1600 | { | |
1601 | struct sockaddr *sa = svc_addr(rqstp); | |
1602 | /* | |
1603 | * This is a little silly; with sessions there's no real | |
1604 | * use for the callback address. Use the peer address | |
1605 | * as a reasonable default for now, but consider fixing | |
1606 | * the rpc client not to require an address in the | |
1607 | * future: | |
1608 | */ | |
1609 | rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa); | |
1610 | clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa); | |
1611 | } | |
1612 | } | |
1613 | ||
1614 | /* caller must hold client_lock */ | |
1615 | static struct nfsd4_session * | |
1616 | __find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net) | |
1617 | { | |
1618 | struct nfsd4_session *elem; | |
1619 | int idx; | |
1620 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
1621 | ||
1622 | lockdep_assert_held(&nn->client_lock); | |
1623 | ||
1624 | dump_sessionid(__func__, sessionid); | |
1625 | idx = hash_sessionid(sessionid); | |
1626 | /* Search in the appropriate list */ | |
1627 | list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) { | |
1628 | if (!memcmp(elem->se_sessionid.data, sessionid->data, | |
1629 | NFS4_MAX_SESSIONID_LEN)) { | |
1630 | return elem; | |
1631 | } | |
1632 | } | |
1633 | ||
1634 | dprintk("%s: session not found\n", __func__); | |
1635 | return NULL; | |
1636 | } | |
1637 | ||
1638 | static struct nfsd4_session * | |
1639 | find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net, | |
1640 | __be32 *ret) | |
1641 | { | |
1642 | struct nfsd4_session *session; | |
1643 | __be32 status = nfserr_badsession; | |
1644 | ||
1645 | session = __find_in_sessionid_hashtbl(sessionid, net); | |
1646 | if (!session) | |
1647 | goto out; | |
1648 | status = nfsd4_get_session_locked(session); | |
1649 | if (status) | |
1650 | session = NULL; | |
1651 | out: | |
1652 | *ret = status; | |
1653 | return session; | |
1654 | } | |
1655 | ||
1656 | /* caller must hold client_lock */ | |
1657 | static void | |
1658 | unhash_session(struct nfsd4_session *ses) | |
1659 | { | |
1660 | struct nfs4_client *clp = ses->se_client; | |
1661 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
1662 | ||
1663 | lockdep_assert_held(&nn->client_lock); | |
1664 | ||
1665 | list_del(&ses->se_hash); | |
1666 | spin_lock(&ses->se_client->cl_lock); | |
1667 | list_del(&ses->se_perclnt); | |
1668 | spin_unlock(&ses->se_client->cl_lock); | |
1669 | } | |
1670 | ||
1671 | /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */ | |
1672 | static int | |
1673 | STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn) | |
1674 | { | |
1675 | /* | |
1676 | * We're assuming the clid was not given out from a boot | |
1677 | * precisely 2^32 (about 136 years) before this one. That seems | |
1678 | * a safe assumption: | |
1679 | */ | |
1680 | if (clid->cl_boot == (u32)nn->boot_time) | |
1681 | return 0; | |
1682 | dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n", | |
1683 | clid->cl_boot, clid->cl_id, nn->boot_time); | |
1684 | return 1; | |
1685 | } | |
1686 | ||
1687 | /* | |
1688 | * XXX Should we use a slab cache ? | |
1689 | * This type of memory management is somewhat inefficient, but we use it | |
1690 | * anyway since SETCLIENTID is not a common operation. | |
1691 | */ | |
1692 | static struct nfs4_client *alloc_client(struct xdr_netobj name) | |
1693 | { | |
1694 | struct nfs4_client *clp; | |
1695 | int i; | |
1696 | ||
1697 | clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL); | |
1698 | if (clp == NULL) | |
1699 | return NULL; | |
1700 | clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL); | |
1701 | if (clp->cl_name.data == NULL) | |
1702 | goto err_no_name; | |
1703 | clp->cl_ownerstr_hashtbl = kmalloc(sizeof(struct list_head) * | |
1704 | OWNER_HASH_SIZE, GFP_KERNEL); | |
1705 | if (!clp->cl_ownerstr_hashtbl) | |
1706 | goto err_no_hashtbl; | |
1707 | for (i = 0; i < OWNER_HASH_SIZE; i++) | |
1708 | INIT_LIST_HEAD(&clp->cl_ownerstr_hashtbl[i]); | |
1709 | clp->cl_name.len = name.len; | |
1710 | INIT_LIST_HEAD(&clp->cl_sessions); | |
1711 | idr_init(&clp->cl_stateids); | |
1712 | atomic_set(&clp->cl_refcount, 0); | |
1713 | clp->cl_cb_state = NFSD4_CB_UNKNOWN; | |
1714 | INIT_LIST_HEAD(&clp->cl_idhash); | |
1715 | INIT_LIST_HEAD(&clp->cl_openowners); | |
1716 | INIT_LIST_HEAD(&clp->cl_delegations); | |
1717 | INIT_LIST_HEAD(&clp->cl_lru); | |
1718 | INIT_LIST_HEAD(&clp->cl_revoked); | |
1719 | #ifdef CONFIG_NFSD_PNFS | |
1720 | INIT_LIST_HEAD(&clp->cl_lo_states); | |
1721 | #endif | |
1722 | spin_lock_init(&clp->cl_lock); | |
1723 | rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table"); | |
1724 | return clp; | |
1725 | err_no_hashtbl: | |
1726 | kfree(clp->cl_name.data); | |
1727 | err_no_name: | |
1728 | kfree(clp); | |
1729 | return NULL; | |
1730 | } | |
1731 | ||
1732 | static void | |
1733 | free_client(struct nfs4_client *clp) | |
1734 | { | |
1735 | while (!list_empty(&clp->cl_sessions)) { | |
1736 | struct nfsd4_session *ses; | |
1737 | ses = list_entry(clp->cl_sessions.next, struct nfsd4_session, | |
1738 | se_perclnt); | |
1739 | list_del(&ses->se_perclnt); | |
1740 | WARN_ON_ONCE(atomic_read(&ses->se_ref)); | |
1741 | free_session(ses); | |
1742 | } | |
1743 | rpc_destroy_wait_queue(&clp->cl_cb_waitq); | |
1744 | free_svc_cred(&clp->cl_cred); | |
1745 | kfree(clp->cl_ownerstr_hashtbl); | |
1746 | kfree(clp->cl_name.data); | |
1747 | idr_destroy(&clp->cl_stateids); | |
1748 | kfree(clp); | |
1749 | } | |
1750 | ||
1751 | /* must be called under the client_lock */ | |
1752 | static void | |
1753 | unhash_client_locked(struct nfs4_client *clp) | |
1754 | { | |
1755 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
1756 | struct nfsd4_session *ses; | |
1757 | ||
1758 | lockdep_assert_held(&nn->client_lock); | |
1759 | ||
1760 | /* Mark the client as expired! */ | |
1761 | clp->cl_time = 0; | |
1762 | /* Make it invisible */ | |
1763 | if (!list_empty(&clp->cl_idhash)) { | |
1764 | list_del_init(&clp->cl_idhash); | |
1765 | if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags)) | |
1766 | rb_erase(&clp->cl_namenode, &nn->conf_name_tree); | |
1767 | else | |
1768 | rb_erase(&clp->cl_namenode, &nn->unconf_name_tree); | |
1769 | } | |
1770 | list_del_init(&clp->cl_lru); | |
1771 | spin_lock(&clp->cl_lock); | |
1772 | list_for_each_entry(ses, &clp->cl_sessions, se_perclnt) | |
1773 | list_del_init(&ses->se_hash); | |
1774 | spin_unlock(&clp->cl_lock); | |
1775 | } | |
1776 | ||
1777 | static void | |
1778 | unhash_client(struct nfs4_client *clp) | |
1779 | { | |
1780 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
1781 | ||
1782 | spin_lock(&nn->client_lock); | |
1783 | unhash_client_locked(clp); | |
1784 | spin_unlock(&nn->client_lock); | |
1785 | } | |
1786 | ||
1787 | static __be32 mark_client_expired_locked(struct nfs4_client *clp) | |
1788 | { | |
1789 | if (atomic_read(&clp->cl_refcount)) | |
1790 | return nfserr_jukebox; | |
1791 | unhash_client_locked(clp); | |
1792 | return nfs_ok; | |
1793 | } | |
1794 | ||
1795 | static void | |
1796 | __destroy_client(struct nfs4_client *clp) | |
1797 | { | |
1798 | struct nfs4_openowner *oo; | |
1799 | struct nfs4_delegation *dp; | |
1800 | struct list_head reaplist; | |
1801 | ||
1802 | INIT_LIST_HEAD(&reaplist); | |
1803 | spin_lock(&state_lock); | |
1804 | while (!list_empty(&clp->cl_delegations)) { | |
1805 | dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt); | |
1806 | WARN_ON(!unhash_delegation_locked(dp)); | |
1807 | list_add(&dp->dl_recall_lru, &reaplist); | |
1808 | } | |
1809 | spin_unlock(&state_lock); | |
1810 | while (!list_empty(&reaplist)) { | |
1811 | dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru); | |
1812 | list_del_init(&dp->dl_recall_lru); | |
1813 | put_clnt_odstate(dp->dl_clnt_odstate); | |
1814 | nfs4_put_deleg_lease(dp->dl_stid.sc_file); | |
1815 | nfs4_put_stid(&dp->dl_stid); | |
1816 | } | |
1817 | while (!list_empty(&clp->cl_revoked)) { | |
1818 | dp = list_entry(clp->cl_revoked.next, struct nfs4_delegation, dl_recall_lru); | |
1819 | list_del_init(&dp->dl_recall_lru); | |
1820 | nfs4_put_stid(&dp->dl_stid); | |
1821 | } | |
1822 | while (!list_empty(&clp->cl_openowners)) { | |
1823 | oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient); | |
1824 | nfs4_get_stateowner(&oo->oo_owner); | |
1825 | release_openowner(oo); | |
1826 | } | |
1827 | nfsd4_return_all_client_layouts(clp); | |
1828 | nfsd4_shutdown_callback(clp); | |
1829 | if (clp->cl_cb_conn.cb_xprt) | |
1830 | svc_xprt_put(clp->cl_cb_conn.cb_xprt); | |
1831 | free_client(clp); | |
1832 | } | |
1833 | ||
1834 | static void | |
1835 | destroy_client(struct nfs4_client *clp) | |
1836 | { | |
1837 | unhash_client(clp); | |
1838 | __destroy_client(clp); | |
1839 | } | |
1840 | ||
1841 | static void expire_client(struct nfs4_client *clp) | |
1842 | { | |
1843 | unhash_client(clp); | |
1844 | nfsd4_client_record_remove(clp); | |
1845 | __destroy_client(clp); | |
1846 | } | |
1847 | ||
1848 | static void copy_verf(struct nfs4_client *target, nfs4_verifier *source) | |
1849 | { | |
1850 | memcpy(target->cl_verifier.data, source->data, | |
1851 | sizeof(target->cl_verifier.data)); | |
1852 | } | |
1853 | ||
1854 | static void copy_clid(struct nfs4_client *target, struct nfs4_client *source) | |
1855 | { | |
1856 | target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; | |
1857 | target->cl_clientid.cl_id = source->cl_clientid.cl_id; | |
1858 | } | |
1859 | ||
1860 | int strdup_if_nonnull(char **target, char *source) | |
1861 | { | |
1862 | if (source) { | |
1863 | *target = kstrdup(source, GFP_KERNEL); | |
1864 | if (!*target) | |
1865 | return -ENOMEM; | |
1866 | } else | |
1867 | *target = NULL; | |
1868 | return 0; | |
1869 | } | |
1870 | ||
1871 | static int copy_cred(struct svc_cred *target, struct svc_cred *source) | |
1872 | { | |
1873 | int ret; | |
1874 | ||
1875 | ret = strdup_if_nonnull(&target->cr_principal, source->cr_principal); | |
1876 | if (ret) | |
1877 | return ret; | |
1878 | ret = strdup_if_nonnull(&target->cr_raw_principal, | |
1879 | source->cr_raw_principal); | |
1880 | if (ret) | |
1881 | return ret; | |
1882 | target->cr_flavor = source->cr_flavor; | |
1883 | target->cr_uid = source->cr_uid; | |
1884 | target->cr_gid = source->cr_gid; | |
1885 | target->cr_group_info = source->cr_group_info; | |
1886 | get_group_info(target->cr_group_info); | |
1887 | target->cr_gss_mech = source->cr_gss_mech; | |
1888 | if (source->cr_gss_mech) | |
1889 | gss_mech_get(source->cr_gss_mech); | |
1890 | return 0; | |
1891 | } | |
1892 | ||
1893 | static int | |
1894 | compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2) | |
1895 | { | |
1896 | if (o1->len < o2->len) | |
1897 | return -1; | |
1898 | if (o1->len > o2->len) | |
1899 | return 1; | |
1900 | return memcmp(o1->data, o2->data, o1->len); | |
1901 | } | |
1902 | ||
1903 | static int same_name(const char *n1, const char *n2) | |
1904 | { | |
1905 | return 0 == memcmp(n1, n2, HEXDIR_LEN); | |
1906 | } | |
1907 | ||
1908 | static int | |
1909 | same_verf(nfs4_verifier *v1, nfs4_verifier *v2) | |
1910 | { | |
1911 | return 0 == memcmp(v1->data, v2->data, sizeof(v1->data)); | |
1912 | } | |
1913 | ||
1914 | static int | |
1915 | same_clid(clientid_t *cl1, clientid_t *cl2) | |
1916 | { | |
1917 | return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id); | |
1918 | } | |
1919 | ||
1920 | static bool groups_equal(struct group_info *g1, struct group_info *g2) | |
1921 | { | |
1922 | int i; | |
1923 | ||
1924 | if (g1->ngroups != g2->ngroups) | |
1925 | return false; | |
1926 | for (i=0; i<g1->ngroups; i++) | |
1927 | if (!gid_eq(GROUP_AT(g1, i), GROUP_AT(g2, i))) | |
1928 | return false; | |
1929 | return true; | |
1930 | } | |
1931 | ||
1932 | /* | |
1933 | * RFC 3530 language requires clid_inuse be returned when the | |
1934 | * "principal" associated with a requests differs from that previously | |
1935 | * used. We use uid, gid's, and gss principal string as our best | |
1936 | * approximation. We also don't want to allow non-gss use of a client | |
1937 | * established using gss: in theory cr_principal should catch that | |
1938 | * change, but in practice cr_principal can be null even in the gss case | |
1939 | * since gssd doesn't always pass down a principal string. | |
1940 | */ | |
1941 | static bool is_gss_cred(struct svc_cred *cr) | |
1942 | { | |
1943 | /* Is cr_flavor one of the gss "pseudoflavors"?: */ | |
1944 | return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR); | |
1945 | } | |
1946 | ||
1947 | ||
1948 | static bool | |
1949 | same_creds(struct svc_cred *cr1, struct svc_cred *cr2) | |
1950 | { | |
1951 | if ((is_gss_cred(cr1) != is_gss_cred(cr2)) | |
1952 | || (!uid_eq(cr1->cr_uid, cr2->cr_uid)) | |
1953 | || (!gid_eq(cr1->cr_gid, cr2->cr_gid)) | |
1954 | || !groups_equal(cr1->cr_group_info, cr2->cr_group_info)) | |
1955 | return false; | |
1956 | if (cr1->cr_principal == cr2->cr_principal) | |
1957 | return true; | |
1958 | if (!cr1->cr_principal || !cr2->cr_principal) | |
1959 | return false; | |
1960 | return 0 == strcmp(cr1->cr_principal, cr2->cr_principal); | |
1961 | } | |
1962 | ||
1963 | static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp) | |
1964 | { | |
1965 | struct svc_cred *cr = &rqstp->rq_cred; | |
1966 | u32 service; | |
1967 | ||
1968 | if (!cr->cr_gss_mech) | |
1969 | return false; | |
1970 | service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor); | |
1971 | return service == RPC_GSS_SVC_INTEGRITY || | |
1972 | service == RPC_GSS_SVC_PRIVACY; | |
1973 | } | |
1974 | ||
1975 | static bool mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp) | |
1976 | { | |
1977 | struct svc_cred *cr = &rqstp->rq_cred; | |
1978 | ||
1979 | if (!cl->cl_mach_cred) | |
1980 | return true; | |
1981 | if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech) | |
1982 | return false; | |
1983 | if (!svc_rqst_integrity_protected(rqstp)) | |
1984 | return false; | |
1985 | if (cl->cl_cred.cr_raw_principal) | |
1986 | return 0 == strcmp(cl->cl_cred.cr_raw_principal, | |
1987 | cr->cr_raw_principal); | |
1988 | if (!cr->cr_principal) | |
1989 | return false; | |
1990 | return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal); | |
1991 | } | |
1992 | ||
1993 | static void gen_confirm(struct nfs4_client *clp, struct nfsd_net *nn) | |
1994 | { | |
1995 | __be32 verf[2]; | |
1996 | ||
1997 | /* | |
1998 | * This is opaque to client, so no need to byte-swap. Use | |
1999 | * __force to keep sparse happy | |
2000 | */ | |
2001 | verf[0] = (__force __be32)get_seconds(); | |
2002 | verf[1] = (__force __be32)nn->clverifier_counter++; | |
2003 | memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data)); | |
2004 | } | |
2005 | ||
2006 | static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn) | |
2007 | { | |
2008 | clp->cl_clientid.cl_boot = nn->boot_time; | |
2009 | clp->cl_clientid.cl_id = nn->clientid_counter++; | |
2010 | gen_confirm(clp, nn); | |
2011 | } | |
2012 | ||
2013 | static struct nfs4_stid * | |
2014 | find_stateid_locked(struct nfs4_client *cl, stateid_t *t) | |
2015 | { | |
2016 | struct nfs4_stid *ret; | |
2017 | ||
2018 | ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id); | |
2019 | if (!ret || !ret->sc_type) | |
2020 | return NULL; | |
2021 | return ret; | |
2022 | } | |
2023 | ||
2024 | static struct nfs4_stid * | |
2025 | find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask) | |
2026 | { | |
2027 | struct nfs4_stid *s; | |
2028 | ||
2029 | spin_lock(&cl->cl_lock); | |
2030 | s = find_stateid_locked(cl, t); | |
2031 | if (s != NULL) { | |
2032 | if (typemask & s->sc_type) | |
2033 | atomic_inc(&s->sc_count); | |
2034 | else | |
2035 | s = NULL; | |
2036 | } | |
2037 | spin_unlock(&cl->cl_lock); | |
2038 | return s; | |
2039 | } | |
2040 | ||
2041 | static struct nfs4_client *create_client(struct xdr_netobj name, | |
2042 | struct svc_rqst *rqstp, nfs4_verifier *verf) | |
2043 | { | |
2044 | struct nfs4_client *clp; | |
2045 | struct sockaddr *sa = svc_addr(rqstp); | |
2046 | int ret; | |
2047 | struct net *net = SVC_NET(rqstp); | |
2048 | ||
2049 | clp = alloc_client(name); | |
2050 | if (clp == NULL) | |
2051 | return NULL; | |
2052 | ||
2053 | ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred); | |
2054 | if (ret) { | |
2055 | free_client(clp); | |
2056 | return NULL; | |
2057 | } | |
2058 | nfsd4_init_cb(&clp->cl_cb_null, clp, NULL, NFSPROC4_CLNT_CB_NULL); | |
2059 | clp->cl_time = get_seconds(); | |
2060 | clear_bit(0, &clp->cl_cb_slot_busy); | |
2061 | copy_verf(clp, verf); | |
2062 | rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa); | |
2063 | clp->cl_cb_session = NULL; | |
2064 | clp->net = net; | |
2065 | return clp; | |
2066 | } | |
2067 | ||
2068 | static void | |
2069 | add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root) | |
2070 | { | |
2071 | struct rb_node **new = &(root->rb_node), *parent = NULL; | |
2072 | struct nfs4_client *clp; | |
2073 | ||
2074 | while (*new) { | |
2075 | clp = rb_entry(*new, struct nfs4_client, cl_namenode); | |
2076 | parent = *new; | |
2077 | ||
2078 | if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0) | |
2079 | new = &((*new)->rb_left); | |
2080 | else | |
2081 | new = &((*new)->rb_right); | |
2082 | } | |
2083 | ||
2084 | rb_link_node(&new_clp->cl_namenode, parent, new); | |
2085 | rb_insert_color(&new_clp->cl_namenode, root); | |
2086 | } | |
2087 | ||
2088 | static struct nfs4_client * | |
2089 | find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root) | |
2090 | { | |
2091 | int cmp; | |
2092 | struct rb_node *node = root->rb_node; | |
2093 | struct nfs4_client *clp; | |
2094 | ||
2095 | while (node) { | |
2096 | clp = rb_entry(node, struct nfs4_client, cl_namenode); | |
2097 | cmp = compare_blob(&clp->cl_name, name); | |
2098 | if (cmp > 0) | |
2099 | node = node->rb_left; | |
2100 | else if (cmp < 0) | |
2101 | node = node->rb_right; | |
2102 | else | |
2103 | return clp; | |
2104 | } | |
2105 | return NULL; | |
2106 | } | |
2107 | ||
2108 | static void | |
2109 | add_to_unconfirmed(struct nfs4_client *clp) | |
2110 | { | |
2111 | unsigned int idhashval; | |
2112 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
2113 | ||
2114 | lockdep_assert_held(&nn->client_lock); | |
2115 | ||
2116 | clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags); | |
2117 | add_clp_to_name_tree(clp, &nn->unconf_name_tree); | |
2118 | idhashval = clientid_hashval(clp->cl_clientid.cl_id); | |
2119 | list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]); | |
2120 | renew_client_locked(clp); | |
2121 | } | |
2122 | ||
2123 | static void | |
2124 | move_to_confirmed(struct nfs4_client *clp) | |
2125 | { | |
2126 | unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id); | |
2127 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
2128 | ||
2129 | lockdep_assert_held(&nn->client_lock); | |
2130 | ||
2131 | dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp); | |
2132 | list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]); | |
2133 | rb_erase(&clp->cl_namenode, &nn->unconf_name_tree); | |
2134 | add_clp_to_name_tree(clp, &nn->conf_name_tree); | |
2135 | set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags); | |
2136 | renew_client_locked(clp); | |
2137 | } | |
2138 | ||
2139 | static struct nfs4_client * | |
2140 | find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions) | |
2141 | { | |
2142 | struct nfs4_client *clp; | |
2143 | unsigned int idhashval = clientid_hashval(clid->cl_id); | |
2144 | ||
2145 | list_for_each_entry(clp, &tbl[idhashval], cl_idhash) { | |
2146 | if (same_clid(&clp->cl_clientid, clid)) { | |
2147 | if ((bool)clp->cl_minorversion != sessions) | |
2148 | return NULL; | |
2149 | renew_client_locked(clp); | |
2150 | return clp; | |
2151 | } | |
2152 | } | |
2153 | return NULL; | |
2154 | } | |
2155 | ||
2156 | static struct nfs4_client * | |
2157 | find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn) | |
2158 | { | |
2159 | struct list_head *tbl = nn->conf_id_hashtbl; | |
2160 | ||
2161 | lockdep_assert_held(&nn->client_lock); | |
2162 | return find_client_in_id_table(tbl, clid, sessions); | |
2163 | } | |
2164 | ||
2165 | static struct nfs4_client * | |
2166 | find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn) | |
2167 | { | |
2168 | struct list_head *tbl = nn->unconf_id_hashtbl; | |
2169 | ||
2170 | lockdep_assert_held(&nn->client_lock); | |
2171 | return find_client_in_id_table(tbl, clid, sessions); | |
2172 | } | |
2173 | ||
2174 | static bool clp_used_exchangeid(struct nfs4_client *clp) | |
2175 | { | |
2176 | return clp->cl_exchange_flags != 0; | |
2177 | } | |
2178 | ||
2179 | static struct nfs4_client * | |
2180 | find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn) | |
2181 | { | |
2182 | lockdep_assert_held(&nn->client_lock); | |
2183 | return find_clp_in_name_tree(name, &nn->conf_name_tree); | |
2184 | } | |
2185 | ||
2186 | static struct nfs4_client * | |
2187 | find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn) | |
2188 | { | |
2189 | lockdep_assert_held(&nn->client_lock); | |
2190 | return find_clp_in_name_tree(name, &nn->unconf_name_tree); | |
2191 | } | |
2192 | ||
2193 | static void | |
2194 | gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp) | |
2195 | { | |
2196 | struct nfs4_cb_conn *conn = &clp->cl_cb_conn; | |
2197 | struct sockaddr *sa = svc_addr(rqstp); | |
2198 | u32 scopeid = rpc_get_scope_id(sa); | |
2199 | unsigned short expected_family; | |
2200 | ||
2201 | /* Currently, we only support tcp and tcp6 for the callback channel */ | |
2202 | if (se->se_callback_netid_len == 3 && | |
2203 | !memcmp(se->se_callback_netid_val, "tcp", 3)) | |
2204 | expected_family = AF_INET; | |
2205 | else if (se->se_callback_netid_len == 4 && | |
2206 | !memcmp(se->se_callback_netid_val, "tcp6", 4)) | |
2207 | expected_family = AF_INET6; | |
2208 | else | |
2209 | goto out_err; | |
2210 | ||
2211 | conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val, | |
2212 | se->se_callback_addr_len, | |
2213 | (struct sockaddr *)&conn->cb_addr, | |
2214 | sizeof(conn->cb_addr)); | |
2215 | ||
2216 | if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family) | |
2217 | goto out_err; | |
2218 | ||
2219 | if (conn->cb_addr.ss_family == AF_INET6) | |
2220 | ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid; | |
2221 | ||
2222 | conn->cb_prog = se->se_callback_prog; | |
2223 | conn->cb_ident = se->se_callback_ident; | |
2224 | memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen); | |
2225 | return; | |
2226 | out_err: | |
2227 | conn->cb_addr.ss_family = AF_UNSPEC; | |
2228 | conn->cb_addrlen = 0; | |
2229 | dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) " | |
2230 | "will not receive delegations\n", | |
2231 | clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id); | |
2232 | ||
2233 | return; | |
2234 | } | |
2235 | ||
2236 | /* | |
2237 | * Cache a reply. nfsd4_check_resp_size() has bounded the cache size. | |
2238 | */ | |
2239 | static void | |
2240 | nfsd4_store_cache_entry(struct nfsd4_compoundres *resp) | |
2241 | { | |
2242 | struct xdr_buf *buf = resp->xdr.buf; | |
2243 | struct nfsd4_slot *slot = resp->cstate.slot; | |
2244 | unsigned int base; | |
2245 | ||
2246 | dprintk("--> %s slot %p\n", __func__, slot); | |
2247 | ||
2248 | slot->sl_opcnt = resp->opcnt; | |
2249 | slot->sl_status = resp->cstate.status; | |
2250 | ||
2251 | slot->sl_flags |= NFSD4_SLOT_INITIALIZED; | |
2252 | if (nfsd4_not_cached(resp)) { | |
2253 | slot->sl_datalen = 0; | |
2254 | return; | |
2255 | } | |
2256 | base = resp->cstate.data_offset; | |
2257 | slot->sl_datalen = buf->len - base; | |
2258 | if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen)) | |
2259 | WARN(1, "%s: sessions DRC could not cache compound\n", | |
2260 | __func__); | |
2261 | return; | |
2262 | } | |
2263 | ||
2264 | /* | |
2265 | * Encode the replay sequence operation from the slot values. | |
2266 | * If cachethis is FALSE encode the uncached rep error on the next | |
2267 | * operation which sets resp->p and increments resp->opcnt for | |
2268 | * nfs4svc_encode_compoundres. | |
2269 | * | |
2270 | */ | |
2271 | static __be32 | |
2272 | nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args, | |
2273 | struct nfsd4_compoundres *resp) | |
2274 | { | |
2275 | struct nfsd4_op *op; | |
2276 | struct nfsd4_slot *slot = resp->cstate.slot; | |
2277 | ||
2278 | /* Encode the replayed sequence operation */ | |
2279 | op = &args->ops[resp->opcnt - 1]; | |
2280 | nfsd4_encode_operation(resp, op); | |
2281 | ||
2282 | /* Return nfserr_retry_uncached_rep in next operation. */ | |
2283 | if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) { | |
2284 | op = &args->ops[resp->opcnt++]; | |
2285 | op->status = nfserr_retry_uncached_rep; | |
2286 | nfsd4_encode_operation(resp, op); | |
2287 | } | |
2288 | return op->status; | |
2289 | } | |
2290 | ||
2291 | /* | |
2292 | * The sequence operation is not cached because we can use the slot and | |
2293 | * session values. | |
2294 | */ | |
2295 | static __be32 | |
2296 | nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp, | |
2297 | struct nfsd4_sequence *seq) | |
2298 | { | |
2299 | struct nfsd4_slot *slot = resp->cstate.slot; | |
2300 | struct xdr_stream *xdr = &resp->xdr; | |
2301 | __be32 *p; | |
2302 | __be32 status; | |
2303 | ||
2304 | dprintk("--> %s slot %p\n", __func__, slot); | |
2305 | ||
2306 | status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp); | |
2307 | if (status) | |
2308 | return status; | |
2309 | ||
2310 | p = xdr_reserve_space(xdr, slot->sl_datalen); | |
2311 | if (!p) { | |
2312 | WARN_ON_ONCE(1); | |
2313 | return nfserr_serverfault; | |
2314 | } | |
2315 | xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen); | |
2316 | xdr_commit_encode(xdr); | |
2317 | ||
2318 | resp->opcnt = slot->sl_opcnt; | |
2319 | return slot->sl_status; | |
2320 | } | |
2321 | ||
2322 | /* | |
2323 | * Set the exchange_id flags returned by the server. | |
2324 | */ | |
2325 | static void | |
2326 | nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid) | |
2327 | { | |
2328 | #ifdef CONFIG_NFSD_PNFS | |
2329 | new->cl_exchange_flags |= EXCHGID4_FLAG_USE_PNFS_MDS; | |
2330 | #else | |
2331 | new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS; | |
2332 | #endif | |
2333 | ||
2334 | /* Referrals are supported, Migration is not. */ | |
2335 | new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER; | |
2336 | ||
2337 | /* set the wire flags to return to client. */ | |
2338 | clid->flags = new->cl_exchange_flags; | |
2339 | } | |
2340 | ||
2341 | static bool client_has_openowners(struct nfs4_client *clp) | |
2342 | { | |
2343 | struct nfs4_openowner *oo; | |
2344 | ||
2345 | list_for_each_entry(oo, &clp->cl_openowners, oo_perclient) { | |
2346 | if (!list_empty(&oo->oo_owner.so_stateids)) | |
2347 | return true; | |
2348 | } | |
2349 | return false; | |
2350 | } | |
2351 | ||
2352 | static bool client_has_state(struct nfs4_client *clp) | |
2353 | { | |
2354 | return client_has_openowners(clp) | |
2355 | #ifdef CONFIG_NFSD_PNFS | |
2356 | || !list_empty(&clp->cl_lo_states) | |
2357 | #endif | |
2358 | || !list_empty(&clp->cl_delegations) | |
2359 | || !list_empty(&clp->cl_sessions); | |
2360 | } | |
2361 | ||
2362 | __be32 | |
2363 | nfsd4_exchange_id(struct svc_rqst *rqstp, | |
2364 | struct nfsd4_compound_state *cstate, | |
2365 | struct nfsd4_exchange_id *exid) | |
2366 | { | |
2367 | struct nfs4_client *conf, *new; | |
2368 | struct nfs4_client *unconf = NULL; | |
2369 | __be32 status; | |
2370 | char addr_str[INET6_ADDRSTRLEN]; | |
2371 | nfs4_verifier verf = exid->verifier; | |
2372 | struct sockaddr *sa = svc_addr(rqstp); | |
2373 | bool update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A; | |
2374 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
2375 | ||
2376 | rpc_ntop(sa, addr_str, sizeof(addr_str)); | |
2377 | dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p " | |
2378 | "ip_addr=%s flags %x, spa_how %d\n", | |
2379 | __func__, rqstp, exid, exid->clname.len, exid->clname.data, | |
2380 | addr_str, exid->flags, exid->spa_how); | |
2381 | ||
2382 | if (exid->flags & ~EXCHGID4_FLAG_MASK_A) | |
2383 | return nfserr_inval; | |
2384 | ||
2385 | new = create_client(exid->clname, rqstp, &verf); | |
2386 | if (new == NULL) | |
2387 | return nfserr_jukebox; | |
2388 | ||
2389 | switch (exid->spa_how) { | |
2390 | case SP4_MACH_CRED: | |
2391 | if (!svc_rqst_integrity_protected(rqstp)) { | |
2392 | status = nfserr_inval; | |
2393 | goto out_nolock; | |
2394 | } | |
2395 | /* | |
2396 | * Sometimes userspace doesn't give us a principal. | |
2397 | * Which is a bug, really. Anyway, we can't enforce | |
2398 | * MACH_CRED in that case, better to give up now: | |
2399 | */ | |
2400 | if (!new->cl_cred.cr_principal && | |
2401 | !new->cl_cred.cr_raw_principal) { | |
2402 | status = nfserr_serverfault; | |
2403 | goto out_nolock; | |
2404 | } | |
2405 | new->cl_mach_cred = true; | |
2406 | case SP4_NONE: | |
2407 | break; | |
2408 | default: /* checked by xdr code */ | |
2409 | WARN_ON_ONCE(1); | |
2410 | case SP4_SSV: | |
2411 | status = nfserr_encr_alg_unsupp; | |
2412 | goto out_nolock; | |
2413 | } | |
2414 | ||
2415 | /* Cases below refer to rfc 5661 section 18.35.4: */ | |
2416 | spin_lock(&nn->client_lock); | |
2417 | conf = find_confirmed_client_by_name(&exid->clname, nn); | |
2418 | if (conf) { | |
2419 | bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred); | |
2420 | bool verfs_match = same_verf(&verf, &conf->cl_verifier); | |
2421 | ||
2422 | if (update) { | |
2423 | if (!clp_used_exchangeid(conf)) { /* buggy client */ | |
2424 | status = nfserr_inval; | |
2425 | goto out; | |
2426 | } | |
2427 | if (!mach_creds_match(conf, rqstp)) { | |
2428 | status = nfserr_wrong_cred; | |
2429 | goto out; | |
2430 | } | |
2431 | if (!creds_match) { /* case 9 */ | |
2432 | status = nfserr_perm; | |
2433 | goto out; | |
2434 | } | |
2435 | if (!verfs_match) { /* case 8 */ | |
2436 | status = nfserr_not_same; | |
2437 | goto out; | |
2438 | } | |
2439 | /* case 6 */ | |
2440 | exid->flags |= EXCHGID4_FLAG_CONFIRMED_R; | |
2441 | goto out_copy; | |
2442 | } | |
2443 | if (!creds_match) { /* case 3 */ | |
2444 | if (client_has_state(conf)) { | |
2445 | status = nfserr_clid_inuse; | |
2446 | goto out; | |
2447 | } | |
2448 | goto out_new; | |
2449 | } | |
2450 | if (verfs_match) { /* case 2 */ | |
2451 | conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R; | |
2452 | goto out_copy; | |
2453 | } | |
2454 | /* case 5, client reboot */ | |
2455 | conf = NULL; | |
2456 | goto out_new; | |
2457 | } | |
2458 | ||
2459 | if (update) { /* case 7 */ | |
2460 | status = nfserr_noent; | |
2461 | goto out; | |
2462 | } | |
2463 | ||
2464 | unconf = find_unconfirmed_client_by_name(&exid->clname, nn); | |
2465 | if (unconf) /* case 4, possible retry or client restart */ | |
2466 | unhash_client_locked(unconf); | |
2467 | ||
2468 | /* case 1 (normal case) */ | |
2469 | out_new: | |
2470 | if (conf) { | |
2471 | status = mark_client_expired_locked(conf); | |
2472 | if (status) | |
2473 | goto out; | |
2474 | } | |
2475 | new->cl_minorversion = cstate->minorversion; | |
2476 | ||
2477 | gen_clid(new, nn); | |
2478 | add_to_unconfirmed(new); | |
2479 | swap(new, conf); | |
2480 | out_copy: | |
2481 | exid->clientid.cl_boot = conf->cl_clientid.cl_boot; | |
2482 | exid->clientid.cl_id = conf->cl_clientid.cl_id; | |
2483 | ||
2484 | exid->seqid = conf->cl_cs_slot.sl_seqid + 1; | |
2485 | nfsd4_set_ex_flags(conf, exid); | |
2486 | ||
2487 | dprintk("nfsd4_exchange_id seqid %d flags %x\n", | |
2488 | conf->cl_cs_slot.sl_seqid, conf->cl_exchange_flags); | |
2489 | status = nfs_ok; | |
2490 | ||
2491 | out: | |
2492 | spin_unlock(&nn->client_lock); | |
2493 | out_nolock: | |
2494 | if (new) | |
2495 | expire_client(new); | |
2496 | if (unconf) | |
2497 | expire_client(unconf); | |
2498 | return status; | |
2499 | } | |
2500 | ||
2501 | static __be32 | |
2502 | check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse) | |
2503 | { | |
2504 | dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid, | |
2505 | slot_seqid); | |
2506 | ||
2507 | /* The slot is in use, and no response has been sent. */ | |
2508 | if (slot_inuse) { | |
2509 | if (seqid == slot_seqid) | |
2510 | return nfserr_jukebox; | |
2511 | else | |
2512 | return nfserr_seq_misordered; | |
2513 | } | |
2514 | /* Note unsigned 32-bit arithmetic handles wraparound: */ | |
2515 | if (likely(seqid == slot_seqid + 1)) | |
2516 | return nfs_ok; | |
2517 | if (seqid == slot_seqid) | |
2518 | return nfserr_replay_cache; | |
2519 | return nfserr_seq_misordered; | |
2520 | } | |
2521 | ||
2522 | /* | |
2523 | * Cache the create session result into the create session single DRC | |
2524 | * slot cache by saving the xdr structure. sl_seqid has been set. | |
2525 | * Do this for solo or embedded create session operations. | |
2526 | */ | |
2527 | static void | |
2528 | nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses, | |
2529 | struct nfsd4_clid_slot *slot, __be32 nfserr) | |
2530 | { | |
2531 | slot->sl_status = nfserr; | |
2532 | memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses)); | |
2533 | } | |
2534 | ||
2535 | static __be32 | |
2536 | nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses, | |
2537 | struct nfsd4_clid_slot *slot) | |
2538 | { | |
2539 | memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses)); | |
2540 | return slot->sl_status; | |
2541 | } | |
2542 | ||
2543 | #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\ | |
2544 | 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \ | |
2545 | 1 + /* MIN tag is length with zero, only length */ \ | |
2546 | 3 + /* version, opcount, opcode */ \ | |
2547 | XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \ | |
2548 | /* seqid, slotID, slotID, cache */ \ | |
2549 | 4 ) * sizeof(__be32)) | |
2550 | ||
2551 | #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\ | |
2552 | 2 + /* verifier: AUTH_NULL, length 0 */\ | |
2553 | 1 + /* status */ \ | |
2554 | 1 + /* MIN tag is length with zero, only length */ \ | |
2555 | 3 + /* opcount, opcode, opstatus*/ \ | |
2556 | XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \ | |
2557 | /* seqid, slotID, slotID, slotID, status */ \ | |
2558 | 5 ) * sizeof(__be32)) | |
2559 | ||
2560 | static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn) | |
2561 | { | |
2562 | u32 maxrpc = nn->nfsd_serv->sv_max_mesg; | |
2563 | ||
2564 | if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ) | |
2565 | return nfserr_toosmall; | |
2566 | if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ) | |
2567 | return nfserr_toosmall; | |
2568 | ca->headerpadsz = 0; | |
2569 | ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc); | |
2570 | ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc); | |
2571 | ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND); | |
2572 | ca->maxresp_cached = min_t(u32, ca->maxresp_cached, | |
2573 | NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ); | |
2574 | ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION); | |
2575 | /* | |
2576 | * Note decreasing slot size below client's request may make it | |
2577 | * difficult for client to function correctly, whereas | |
2578 | * decreasing the number of slots will (just?) affect | |
2579 | * performance. When short on memory we therefore prefer to | |
2580 | * decrease number of slots instead of their size. Clients that | |
2581 | * request larger slots than they need will get poor results: | |
2582 | */ | |
2583 | ca->maxreqs = nfsd4_get_drc_mem(ca); | |
2584 | if (!ca->maxreqs) | |
2585 | return nfserr_jukebox; | |
2586 | ||
2587 | return nfs_ok; | |
2588 | } | |
2589 | ||
2590 | /* | |
2591 | * Server's NFSv4.1 backchannel support is AUTH_SYS-only for now. | |
2592 | * These are based on similar macros in linux/sunrpc/msg_prot.h . | |
2593 | */ | |
2594 | #define RPC_MAX_HEADER_WITH_AUTH_SYS \ | |
2595 | (RPC_CALLHDRSIZE + 2 * (2 + UNX_CALLSLACK)) | |
2596 | ||
2597 | #define RPC_MAX_REPHEADER_WITH_AUTH_SYS \ | |
2598 | (RPC_REPHDRSIZE + (2 + NUL_REPLYSLACK)) | |
2599 | ||
2600 | #define NFSD_CB_MAX_REQ_SZ ((NFS4_enc_cb_recall_sz + \ | |
2601 | RPC_MAX_HEADER_WITH_AUTH_SYS) * sizeof(__be32)) | |
2602 | #define NFSD_CB_MAX_RESP_SZ ((NFS4_dec_cb_recall_sz + \ | |
2603 | RPC_MAX_REPHEADER_WITH_AUTH_SYS) * \ | |
2604 | sizeof(__be32)) | |
2605 | ||
2606 | static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca) | |
2607 | { | |
2608 | ca->headerpadsz = 0; | |
2609 | ||
2610 | if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ) | |
2611 | return nfserr_toosmall; | |
2612 | if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ) | |
2613 | return nfserr_toosmall; | |
2614 | ca->maxresp_cached = 0; | |
2615 | if (ca->maxops < 2) | |
2616 | return nfserr_toosmall; | |
2617 | ||
2618 | return nfs_ok; | |
2619 | } | |
2620 | ||
2621 | static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs) | |
2622 | { | |
2623 | switch (cbs->flavor) { | |
2624 | case RPC_AUTH_NULL: | |
2625 | case RPC_AUTH_UNIX: | |
2626 | return nfs_ok; | |
2627 | default: | |
2628 | /* | |
2629 | * GSS case: the spec doesn't allow us to return this | |
2630 | * error. But it also doesn't allow us not to support | |
2631 | * GSS. | |
2632 | * I'd rather this fail hard than return some error the | |
2633 | * client might think it can already handle: | |
2634 | */ | |
2635 | return nfserr_encr_alg_unsupp; | |
2636 | } | |
2637 | } | |
2638 | ||
2639 | __be32 | |
2640 | nfsd4_create_session(struct svc_rqst *rqstp, | |
2641 | struct nfsd4_compound_state *cstate, | |
2642 | struct nfsd4_create_session *cr_ses) | |
2643 | { | |
2644 | struct sockaddr *sa = svc_addr(rqstp); | |
2645 | struct nfs4_client *conf, *unconf; | |
2646 | struct nfs4_client *old = NULL; | |
2647 | struct nfsd4_session *new; | |
2648 | struct nfsd4_conn *conn; | |
2649 | struct nfsd4_clid_slot *cs_slot = NULL; | |
2650 | __be32 status = 0; | |
2651 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
2652 | ||
2653 | if (cr_ses->flags & ~SESSION4_FLAG_MASK_A) | |
2654 | return nfserr_inval; | |
2655 | status = nfsd4_check_cb_sec(&cr_ses->cb_sec); | |
2656 | if (status) | |
2657 | return status; | |
2658 | status = check_forechannel_attrs(&cr_ses->fore_channel, nn); | |
2659 | if (status) | |
2660 | return status; | |
2661 | status = check_backchannel_attrs(&cr_ses->back_channel); | |
2662 | if (status) | |
2663 | goto out_release_drc_mem; | |
2664 | status = nfserr_jukebox; | |
2665 | new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel); | |
2666 | if (!new) | |
2667 | goto out_release_drc_mem; | |
2668 | conn = alloc_conn_from_crses(rqstp, cr_ses); | |
2669 | if (!conn) | |
2670 | goto out_free_session; | |
2671 | ||
2672 | spin_lock(&nn->client_lock); | |
2673 | unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn); | |
2674 | conf = find_confirmed_client(&cr_ses->clientid, true, nn); | |
2675 | WARN_ON_ONCE(conf && unconf); | |
2676 | ||
2677 | if (conf) { | |
2678 | status = nfserr_wrong_cred; | |
2679 | if (!mach_creds_match(conf, rqstp)) | |
2680 | goto out_free_conn; | |
2681 | cs_slot = &conf->cl_cs_slot; | |
2682 | status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0); | |
2683 | if (status) { | |
2684 | if (status == nfserr_replay_cache) | |
2685 | status = nfsd4_replay_create_session(cr_ses, cs_slot); | |
2686 | goto out_free_conn; | |
2687 | } | |
2688 | } else if (unconf) { | |
2689 | if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) || | |
2690 | !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) { | |
2691 | status = nfserr_clid_inuse; | |
2692 | goto out_free_conn; | |
2693 | } | |
2694 | status = nfserr_wrong_cred; | |
2695 | if (!mach_creds_match(unconf, rqstp)) | |
2696 | goto out_free_conn; | |
2697 | cs_slot = &unconf->cl_cs_slot; | |
2698 | status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0); | |
2699 | if (status) { | |
2700 | /* an unconfirmed replay returns misordered */ | |
2701 | status = nfserr_seq_misordered; | |
2702 | goto out_free_conn; | |
2703 | } | |
2704 | old = find_confirmed_client_by_name(&unconf->cl_name, nn); | |
2705 | if (old) { | |
2706 | status = mark_client_expired_locked(old); | |
2707 | if (status) { | |
2708 | old = NULL; | |
2709 | goto out_free_conn; | |
2710 | } | |
2711 | } | |
2712 | move_to_confirmed(unconf); | |
2713 | conf = unconf; | |
2714 | } else { | |
2715 | status = nfserr_stale_clientid; | |
2716 | goto out_free_conn; | |
2717 | } | |
2718 | status = nfs_ok; | |
2719 | /* Persistent sessions are not supported */ | |
2720 | cr_ses->flags &= ~SESSION4_PERSIST; | |
2721 | /* Upshifting from TCP to RDMA is not supported */ | |
2722 | cr_ses->flags &= ~SESSION4_RDMA; | |
2723 | ||
2724 | init_session(rqstp, new, conf, cr_ses); | |
2725 | nfsd4_get_session_locked(new); | |
2726 | ||
2727 | memcpy(cr_ses->sessionid.data, new->se_sessionid.data, | |
2728 | NFS4_MAX_SESSIONID_LEN); | |
2729 | cs_slot->sl_seqid++; | |
2730 | cr_ses->seqid = cs_slot->sl_seqid; | |
2731 | ||
2732 | /* cache solo and embedded create sessions under the client_lock */ | |
2733 | nfsd4_cache_create_session(cr_ses, cs_slot, status); | |
2734 | spin_unlock(&nn->client_lock); | |
2735 | /* init connection and backchannel */ | |
2736 | nfsd4_init_conn(rqstp, conn, new); | |
2737 | nfsd4_put_session(new); | |
2738 | if (old) | |
2739 | expire_client(old); | |
2740 | return status; | |
2741 | out_free_conn: | |
2742 | spin_unlock(&nn->client_lock); | |
2743 | free_conn(conn); | |
2744 | if (old) | |
2745 | expire_client(old); | |
2746 | out_free_session: | |
2747 | __free_session(new); | |
2748 | out_release_drc_mem: | |
2749 | nfsd4_put_drc_mem(&cr_ses->fore_channel); | |
2750 | return status; | |
2751 | } | |
2752 | ||
2753 | static __be32 nfsd4_map_bcts_dir(u32 *dir) | |
2754 | { | |
2755 | switch (*dir) { | |
2756 | case NFS4_CDFC4_FORE: | |
2757 | case NFS4_CDFC4_BACK: | |
2758 | return nfs_ok; | |
2759 | case NFS4_CDFC4_FORE_OR_BOTH: | |
2760 | case NFS4_CDFC4_BACK_OR_BOTH: | |
2761 | *dir = NFS4_CDFC4_BOTH; | |
2762 | return nfs_ok; | |
2763 | }; | |
2764 | return nfserr_inval; | |
2765 | } | |
2766 | ||
2767 | __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_backchannel_ctl *bc) | |
2768 | { | |
2769 | struct nfsd4_session *session = cstate->session; | |
2770 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
2771 | __be32 status; | |
2772 | ||
2773 | status = nfsd4_check_cb_sec(&bc->bc_cb_sec); | |
2774 | if (status) | |
2775 | return status; | |
2776 | spin_lock(&nn->client_lock); | |
2777 | session->se_cb_prog = bc->bc_cb_program; | |
2778 | session->se_cb_sec = bc->bc_cb_sec; | |
2779 | spin_unlock(&nn->client_lock); | |
2780 | ||
2781 | nfsd4_probe_callback(session->se_client); | |
2782 | ||
2783 | return nfs_ok; | |
2784 | } | |
2785 | ||
2786 | __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp, | |
2787 | struct nfsd4_compound_state *cstate, | |
2788 | struct nfsd4_bind_conn_to_session *bcts) | |
2789 | { | |
2790 | __be32 status; | |
2791 | struct nfsd4_conn *conn; | |
2792 | struct nfsd4_session *session; | |
2793 | struct net *net = SVC_NET(rqstp); | |
2794 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
2795 | ||
2796 | if (!nfsd4_last_compound_op(rqstp)) | |
2797 | return nfserr_not_only_op; | |
2798 | spin_lock(&nn->client_lock); | |
2799 | session = find_in_sessionid_hashtbl(&bcts->sessionid, net, &status); | |
2800 | spin_unlock(&nn->client_lock); | |
2801 | if (!session) | |
2802 | goto out_no_session; | |
2803 | status = nfserr_wrong_cred; | |
2804 | if (!mach_creds_match(session->se_client, rqstp)) | |
2805 | goto out; | |
2806 | status = nfsd4_map_bcts_dir(&bcts->dir); | |
2807 | if (status) | |
2808 | goto out; | |
2809 | conn = alloc_conn(rqstp, bcts->dir); | |
2810 | status = nfserr_jukebox; | |
2811 | if (!conn) | |
2812 | goto out; | |
2813 | nfsd4_init_conn(rqstp, conn, session); | |
2814 | status = nfs_ok; | |
2815 | out: | |
2816 | nfsd4_put_session(session); | |
2817 | out_no_session: | |
2818 | return status; | |
2819 | } | |
2820 | ||
2821 | static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid) | |
2822 | { | |
2823 | if (!session) | |
2824 | return 0; | |
2825 | return !memcmp(sid, &session->se_sessionid, sizeof(*sid)); | |
2826 | } | |
2827 | ||
2828 | __be32 | |
2829 | nfsd4_destroy_session(struct svc_rqst *r, | |
2830 | struct nfsd4_compound_state *cstate, | |
2831 | struct nfsd4_destroy_session *sessionid) | |
2832 | { | |
2833 | struct nfsd4_session *ses; | |
2834 | __be32 status; | |
2835 | int ref_held_by_me = 0; | |
2836 | struct net *net = SVC_NET(r); | |
2837 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
2838 | ||
2839 | status = nfserr_not_only_op; | |
2840 | if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) { | |
2841 | if (!nfsd4_last_compound_op(r)) | |
2842 | goto out; | |
2843 | ref_held_by_me++; | |
2844 | } | |
2845 | dump_sessionid(__func__, &sessionid->sessionid); | |
2846 | spin_lock(&nn->client_lock); | |
2847 | ses = find_in_sessionid_hashtbl(&sessionid->sessionid, net, &status); | |
2848 | if (!ses) | |
2849 | goto out_client_lock; | |
2850 | status = nfserr_wrong_cred; | |
2851 | if (!mach_creds_match(ses->se_client, r)) | |
2852 | goto out_put_session; | |
2853 | status = mark_session_dead_locked(ses, 1 + ref_held_by_me); | |
2854 | if (status) | |
2855 | goto out_put_session; | |
2856 | unhash_session(ses); | |
2857 | spin_unlock(&nn->client_lock); | |
2858 | ||
2859 | nfsd4_probe_callback_sync(ses->se_client); | |
2860 | ||
2861 | spin_lock(&nn->client_lock); | |
2862 | status = nfs_ok; | |
2863 | out_put_session: | |
2864 | nfsd4_put_session_locked(ses); | |
2865 | out_client_lock: | |
2866 | spin_unlock(&nn->client_lock); | |
2867 | out: | |
2868 | return status; | |
2869 | } | |
2870 | ||
2871 | static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s) | |
2872 | { | |
2873 | struct nfsd4_conn *c; | |
2874 | ||
2875 | list_for_each_entry(c, &s->se_conns, cn_persession) { | |
2876 | if (c->cn_xprt == xpt) { | |
2877 | return c; | |
2878 | } | |
2879 | } | |
2880 | return NULL; | |
2881 | } | |
2882 | ||
2883 | static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses) | |
2884 | { | |
2885 | struct nfs4_client *clp = ses->se_client; | |
2886 | struct nfsd4_conn *c; | |
2887 | __be32 status = nfs_ok; | |
2888 | int ret; | |
2889 | ||
2890 | spin_lock(&clp->cl_lock); | |
2891 | c = __nfsd4_find_conn(new->cn_xprt, ses); | |
2892 | if (c) | |
2893 | goto out_free; | |
2894 | status = nfserr_conn_not_bound_to_session; | |
2895 | if (clp->cl_mach_cred) | |
2896 | goto out_free; | |
2897 | __nfsd4_hash_conn(new, ses); | |
2898 | spin_unlock(&clp->cl_lock); | |
2899 | ret = nfsd4_register_conn(new); | |
2900 | if (ret) | |
2901 | /* oops; xprt is already down: */ | |
2902 | nfsd4_conn_lost(&new->cn_xpt_user); | |
2903 | return nfs_ok; | |
2904 | out_free: | |
2905 | spin_unlock(&clp->cl_lock); | |
2906 | free_conn(new); | |
2907 | return status; | |
2908 | } | |
2909 | ||
2910 | static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session) | |
2911 | { | |
2912 | struct nfsd4_compoundargs *args = rqstp->rq_argp; | |
2913 | ||
2914 | return args->opcnt > session->se_fchannel.maxops; | |
2915 | } | |
2916 | ||
2917 | static bool nfsd4_request_too_big(struct svc_rqst *rqstp, | |
2918 | struct nfsd4_session *session) | |
2919 | { | |
2920 | struct xdr_buf *xb = &rqstp->rq_arg; | |
2921 | ||
2922 | return xb->len > session->se_fchannel.maxreq_sz; | |
2923 | } | |
2924 | ||
2925 | __be32 | |
2926 | nfsd4_sequence(struct svc_rqst *rqstp, | |
2927 | struct nfsd4_compound_state *cstate, | |
2928 | struct nfsd4_sequence *seq) | |
2929 | { | |
2930 | struct nfsd4_compoundres *resp = rqstp->rq_resp; | |
2931 | struct xdr_stream *xdr = &resp->xdr; | |
2932 | struct nfsd4_session *session; | |
2933 | struct nfs4_client *clp; | |
2934 | struct nfsd4_slot *slot; | |
2935 | struct nfsd4_conn *conn; | |
2936 | __be32 status; | |
2937 | int buflen; | |
2938 | struct net *net = SVC_NET(rqstp); | |
2939 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
2940 | ||
2941 | if (resp->opcnt != 1) | |
2942 | return nfserr_sequence_pos; | |
2943 | ||
2944 | /* | |
2945 | * Will be either used or freed by nfsd4_sequence_check_conn | |
2946 | * below. | |
2947 | */ | |
2948 | conn = alloc_conn(rqstp, NFS4_CDFC4_FORE); | |
2949 | if (!conn) | |
2950 | return nfserr_jukebox; | |
2951 | ||
2952 | spin_lock(&nn->client_lock); | |
2953 | session = find_in_sessionid_hashtbl(&seq->sessionid, net, &status); | |
2954 | if (!session) | |
2955 | goto out_no_session; | |
2956 | clp = session->se_client; | |
2957 | ||
2958 | status = nfserr_too_many_ops; | |
2959 | if (nfsd4_session_too_many_ops(rqstp, session)) | |
2960 | goto out_put_session; | |
2961 | ||
2962 | status = nfserr_req_too_big; | |
2963 | if (nfsd4_request_too_big(rqstp, session)) | |
2964 | goto out_put_session; | |
2965 | ||
2966 | status = nfserr_badslot; | |
2967 | if (seq->slotid >= session->se_fchannel.maxreqs) | |
2968 | goto out_put_session; | |
2969 | ||
2970 | slot = session->se_slots[seq->slotid]; | |
2971 | dprintk("%s: slotid %d\n", __func__, seq->slotid); | |
2972 | ||
2973 | /* We do not negotiate the number of slots yet, so set the | |
2974 | * maxslots to the session maxreqs which is used to encode | |
2975 | * sr_highest_slotid and the sr_target_slot id to maxslots */ | |
2976 | seq->maxslots = session->se_fchannel.maxreqs; | |
2977 | ||
2978 | status = check_slot_seqid(seq->seqid, slot->sl_seqid, | |
2979 | slot->sl_flags & NFSD4_SLOT_INUSE); | |
2980 | if (status == nfserr_replay_cache) { | |
2981 | status = nfserr_seq_misordered; | |
2982 | if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED)) | |
2983 | goto out_put_session; | |
2984 | cstate->slot = slot; | |
2985 | cstate->session = session; | |
2986 | cstate->clp = clp; | |
2987 | /* Return the cached reply status and set cstate->status | |
2988 | * for nfsd4_proc_compound processing */ | |
2989 | status = nfsd4_replay_cache_entry(resp, seq); | |
2990 | cstate->status = nfserr_replay_cache; | |
2991 | goto out; | |
2992 | } | |
2993 | if (status) | |
2994 | goto out_put_session; | |
2995 | ||
2996 | status = nfsd4_sequence_check_conn(conn, session); | |
2997 | conn = NULL; | |
2998 | if (status) | |
2999 | goto out_put_session; | |
3000 | ||
3001 | buflen = (seq->cachethis) ? | |
3002 | session->se_fchannel.maxresp_cached : | |
3003 | session->se_fchannel.maxresp_sz; | |
3004 | status = (seq->cachethis) ? nfserr_rep_too_big_to_cache : | |
3005 | nfserr_rep_too_big; | |
3006 | if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack)) | |
3007 | goto out_put_session; | |
3008 | svc_reserve(rqstp, buflen); | |
3009 | ||
3010 | status = nfs_ok; | |
3011 | /* Success! bump slot seqid */ | |
3012 | slot->sl_seqid = seq->seqid; | |
3013 | slot->sl_flags |= NFSD4_SLOT_INUSE; | |
3014 | if (seq->cachethis) | |
3015 | slot->sl_flags |= NFSD4_SLOT_CACHETHIS; | |
3016 | else | |
3017 | slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS; | |
3018 | ||
3019 | cstate->slot = slot; | |
3020 | cstate->session = session; | |
3021 | cstate->clp = clp; | |
3022 | ||
3023 | out: | |
3024 | switch (clp->cl_cb_state) { | |
3025 | case NFSD4_CB_DOWN: | |
3026 | seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN; | |
3027 | break; | |
3028 | case NFSD4_CB_FAULT: | |
3029 | seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT; | |
3030 | break; | |
3031 | default: | |
3032 | seq->status_flags = 0; | |
3033 | } | |
3034 | if (!list_empty(&clp->cl_revoked)) | |
3035 | seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED; | |
3036 | out_no_session: | |
3037 | if (conn) | |
3038 | free_conn(conn); | |
3039 | spin_unlock(&nn->client_lock); | |
3040 | return status; | |
3041 | out_put_session: | |
3042 | nfsd4_put_session_locked(session); | |
3043 | goto out_no_session; | |
3044 | } | |
3045 | ||
3046 | void | |
3047 | nfsd4_sequence_done(struct nfsd4_compoundres *resp) | |
3048 | { | |
3049 | struct nfsd4_compound_state *cs = &resp->cstate; | |
3050 | ||
3051 | if (nfsd4_has_session(cs)) { | |
3052 | if (cs->status != nfserr_replay_cache) { | |
3053 | nfsd4_store_cache_entry(resp); | |
3054 | cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE; | |
3055 | } | |
3056 | /* Drop session reference that was taken in nfsd4_sequence() */ | |
3057 | nfsd4_put_session(cs->session); | |
3058 | } else if (cs->clp) | |
3059 | put_client_renew(cs->clp); | |
3060 | } | |
3061 | ||
3062 | __be32 | |
3063 | nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc) | |
3064 | { | |
3065 | struct nfs4_client *conf, *unconf; | |
3066 | struct nfs4_client *clp = NULL; | |
3067 | __be32 status = 0; | |
3068 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
3069 | ||
3070 | spin_lock(&nn->client_lock); | |
3071 | unconf = find_unconfirmed_client(&dc->clientid, true, nn); | |
3072 | conf = find_confirmed_client(&dc->clientid, true, nn); | |
3073 | WARN_ON_ONCE(conf && unconf); | |
3074 | ||
3075 | if (conf) { | |
3076 | if (client_has_state(conf)) { | |
3077 | status = nfserr_clientid_busy; | |
3078 | goto out; | |
3079 | } | |
3080 | status = mark_client_expired_locked(conf); | |
3081 | if (status) | |
3082 | goto out; | |
3083 | clp = conf; | |
3084 | } else if (unconf) | |
3085 | clp = unconf; | |
3086 | else { | |
3087 | status = nfserr_stale_clientid; | |
3088 | goto out; | |
3089 | } | |
3090 | if (!mach_creds_match(clp, rqstp)) { | |
3091 | clp = NULL; | |
3092 | status = nfserr_wrong_cred; | |
3093 | goto out; | |
3094 | } | |
3095 | unhash_client_locked(clp); | |
3096 | out: | |
3097 | spin_unlock(&nn->client_lock); | |
3098 | if (clp) | |
3099 | expire_client(clp); | |
3100 | return status; | |
3101 | } | |
3102 | ||
3103 | __be32 | |
3104 | nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc) | |
3105 | { | |
3106 | __be32 status = 0; | |
3107 | ||
3108 | if (rc->rca_one_fs) { | |
3109 | if (!cstate->current_fh.fh_dentry) | |
3110 | return nfserr_nofilehandle; | |
3111 | /* | |
3112 | * We don't take advantage of the rca_one_fs case. | |
3113 | * That's OK, it's optional, we can safely ignore it. | |
3114 | */ | |
3115 | return nfs_ok; | |
3116 | } | |
3117 | ||
3118 | status = nfserr_complete_already; | |
3119 | if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, | |
3120 | &cstate->session->se_client->cl_flags)) | |
3121 | goto out; | |
3122 | ||
3123 | status = nfserr_stale_clientid; | |
3124 | if (is_client_expired(cstate->session->se_client)) | |
3125 | /* | |
3126 | * The following error isn't really legal. | |
3127 | * But we only get here if the client just explicitly | |
3128 | * destroyed the client. Surely it no longer cares what | |
3129 | * error it gets back on an operation for the dead | |
3130 | * client. | |
3131 | */ | |
3132 | goto out; | |
3133 | ||
3134 | status = nfs_ok; | |
3135 | nfsd4_client_record_create(cstate->session->se_client); | |
3136 | out: | |
3137 | return status; | |
3138 | } | |
3139 | ||
3140 | __be32 | |
3141 | nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, | |
3142 | struct nfsd4_setclientid *setclid) | |
3143 | { | |
3144 | struct xdr_netobj clname = setclid->se_name; | |
3145 | nfs4_verifier clverifier = setclid->se_verf; | |
3146 | struct nfs4_client *conf, *new; | |
3147 | struct nfs4_client *unconf = NULL; | |
3148 | __be32 status; | |
3149 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
3150 | ||
3151 | new = create_client(clname, rqstp, &clverifier); | |
3152 | if (new == NULL) | |
3153 | return nfserr_jukebox; | |
3154 | /* Cases below refer to rfc 3530 section 14.2.33: */ | |
3155 | spin_lock(&nn->client_lock); | |
3156 | conf = find_confirmed_client_by_name(&clname, nn); | |
3157 | if (conf && client_has_state(conf)) { | |
3158 | /* case 0: */ | |
3159 | status = nfserr_clid_inuse; | |
3160 | if (clp_used_exchangeid(conf)) | |
3161 | goto out; | |
3162 | if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) { | |
3163 | char addr_str[INET6_ADDRSTRLEN]; | |
3164 | rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str, | |
3165 | sizeof(addr_str)); | |
3166 | dprintk("NFSD: setclientid: string in use by client " | |
3167 | "at %s\n", addr_str); | |
3168 | goto out; | |
3169 | } | |
3170 | } | |
3171 | unconf = find_unconfirmed_client_by_name(&clname, nn); | |
3172 | if (unconf) | |
3173 | unhash_client_locked(unconf); | |
3174 | if (conf && same_verf(&conf->cl_verifier, &clverifier)) { | |
3175 | /* case 1: probable callback update */ | |
3176 | copy_clid(new, conf); | |
3177 | gen_confirm(new, nn); | |
3178 | } else /* case 4 (new client) or cases 2, 3 (client reboot): */ | |
3179 | gen_clid(new, nn); | |
3180 | new->cl_minorversion = 0; | |
3181 | gen_callback(new, setclid, rqstp); | |
3182 | add_to_unconfirmed(new); | |
3183 | setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot; | |
3184 | setclid->se_clientid.cl_id = new->cl_clientid.cl_id; | |
3185 | memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data)); | |
3186 | new = NULL; | |
3187 | status = nfs_ok; | |
3188 | out: | |
3189 | spin_unlock(&nn->client_lock); | |
3190 | if (new) | |
3191 | free_client(new); | |
3192 | if (unconf) | |
3193 | expire_client(unconf); | |
3194 | return status; | |
3195 | } | |
3196 | ||
3197 | ||
3198 | __be32 | |
3199 | nfsd4_setclientid_confirm(struct svc_rqst *rqstp, | |
3200 | struct nfsd4_compound_state *cstate, | |
3201 | struct nfsd4_setclientid_confirm *setclientid_confirm) | |
3202 | { | |
3203 | struct nfs4_client *conf, *unconf; | |
3204 | struct nfs4_client *old = NULL; | |
3205 | nfs4_verifier confirm = setclientid_confirm->sc_confirm; | |
3206 | clientid_t * clid = &setclientid_confirm->sc_clientid; | |
3207 | __be32 status; | |
3208 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
3209 | ||
3210 | if (STALE_CLIENTID(clid, nn)) | |
3211 | return nfserr_stale_clientid; | |
3212 | ||
3213 | spin_lock(&nn->client_lock); | |
3214 | conf = find_confirmed_client(clid, false, nn); | |
3215 | unconf = find_unconfirmed_client(clid, false, nn); | |
3216 | /* | |
3217 | * We try hard to give out unique clientid's, so if we get an | |
3218 | * attempt to confirm the same clientid with a different cred, | |
3219 | * the client may be buggy; this should never happen. | |
3220 | * | |
3221 | * Nevertheless, RFC 7530 recommends INUSE for this case: | |
3222 | */ | |
3223 | status = nfserr_clid_inuse; | |
3224 | if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred)) | |
3225 | goto out; | |
3226 | if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred)) | |
3227 | goto out; | |
3228 | /* cases below refer to rfc 3530 section 14.2.34: */ | |
3229 | if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) { | |
3230 | if (conf && !unconf) /* case 2: probable retransmit */ | |
3231 | status = nfs_ok; | |
3232 | else /* case 4: client hasn't noticed we rebooted yet? */ | |
3233 | status = nfserr_stale_clientid; | |
3234 | goto out; | |
3235 | } | |
3236 | status = nfs_ok; | |
3237 | if (conf) { /* case 1: callback update */ | |
3238 | old = unconf; | |
3239 | unhash_client_locked(old); | |
3240 | nfsd4_change_callback(conf, &unconf->cl_cb_conn); | |
3241 | } else { /* case 3: normal case; new or rebooted client */ | |
3242 | old = find_confirmed_client_by_name(&unconf->cl_name, nn); | |
3243 | if (old) { | |
3244 | status = nfserr_clid_inuse; | |
3245 | if (client_has_state(old) | |
3246 | && !same_creds(&unconf->cl_cred, | |
3247 | &old->cl_cred)) | |
3248 | goto out; | |
3249 | status = mark_client_expired_locked(old); | |
3250 | if (status) { | |
3251 | old = NULL; | |
3252 | goto out; | |
3253 | } | |
3254 | } | |
3255 | move_to_confirmed(unconf); | |
3256 | conf = unconf; | |
3257 | } | |
3258 | get_client_locked(conf); | |
3259 | spin_unlock(&nn->client_lock); | |
3260 | nfsd4_probe_callback(conf); | |
3261 | spin_lock(&nn->client_lock); | |
3262 | put_client_renew_locked(conf); | |
3263 | out: | |
3264 | spin_unlock(&nn->client_lock); | |
3265 | if (old) | |
3266 | expire_client(old); | |
3267 | return status; | |
3268 | } | |
3269 | ||
3270 | static struct nfs4_file *nfsd4_alloc_file(void) | |
3271 | { | |
3272 | return kmem_cache_alloc(file_slab, GFP_KERNEL); | |
3273 | } | |
3274 | ||
3275 | /* OPEN Share state helper functions */ | |
3276 | static void nfsd4_init_file(struct knfsd_fh *fh, unsigned int hashval, | |
3277 | struct nfs4_file *fp) | |
3278 | { | |
3279 | lockdep_assert_held(&state_lock); | |
3280 | ||
3281 | atomic_set(&fp->fi_ref, 1); | |
3282 | spin_lock_init(&fp->fi_lock); | |
3283 | INIT_LIST_HEAD(&fp->fi_stateids); | |
3284 | INIT_LIST_HEAD(&fp->fi_delegations); | |
3285 | INIT_LIST_HEAD(&fp->fi_clnt_odstate); | |
3286 | fh_copy_shallow(&fp->fi_fhandle, fh); | |
3287 | fp->fi_deleg_file = NULL; | |
3288 | fp->fi_had_conflict = false; | |
3289 | fp->fi_share_deny = 0; | |
3290 | memset(fp->fi_fds, 0, sizeof(fp->fi_fds)); | |
3291 | memset(fp->fi_access, 0, sizeof(fp->fi_access)); | |
3292 | #ifdef CONFIG_NFSD_PNFS | |
3293 | INIT_LIST_HEAD(&fp->fi_lo_states); | |
3294 | atomic_set(&fp->fi_lo_recalls, 0); | |
3295 | #endif | |
3296 | hlist_add_head_rcu(&fp->fi_hash, &file_hashtbl[hashval]); | |
3297 | } | |
3298 | ||
3299 | void | |
3300 | nfsd4_free_slabs(void) | |
3301 | { | |
3302 | kmem_cache_destroy(odstate_slab); | |
3303 | kmem_cache_destroy(openowner_slab); | |
3304 | kmem_cache_destroy(lockowner_slab); | |
3305 | kmem_cache_destroy(file_slab); | |
3306 | kmem_cache_destroy(stateid_slab); | |
3307 | kmem_cache_destroy(deleg_slab); | |
3308 | } | |
3309 | ||
3310 | int | |
3311 | nfsd4_init_slabs(void) | |
3312 | { | |
3313 | openowner_slab = kmem_cache_create("nfsd4_openowners", | |
3314 | sizeof(struct nfs4_openowner), 0, 0, NULL); | |
3315 | if (openowner_slab == NULL) | |
3316 | goto out; | |
3317 | lockowner_slab = kmem_cache_create("nfsd4_lockowners", | |
3318 | sizeof(struct nfs4_lockowner), 0, 0, NULL); | |
3319 | if (lockowner_slab == NULL) | |
3320 | goto out_free_openowner_slab; | |
3321 | file_slab = kmem_cache_create("nfsd4_files", | |
3322 | sizeof(struct nfs4_file), 0, 0, NULL); | |
3323 | if (file_slab == NULL) | |
3324 | goto out_free_lockowner_slab; | |
3325 | stateid_slab = kmem_cache_create("nfsd4_stateids", | |
3326 | sizeof(struct nfs4_ol_stateid), 0, 0, NULL); | |
3327 | if (stateid_slab == NULL) | |
3328 | goto out_free_file_slab; | |
3329 | deleg_slab = kmem_cache_create("nfsd4_delegations", | |
3330 | sizeof(struct nfs4_delegation), 0, 0, NULL); | |
3331 | if (deleg_slab == NULL) | |
3332 | goto out_free_stateid_slab; | |
3333 | odstate_slab = kmem_cache_create("nfsd4_odstate", | |
3334 | sizeof(struct nfs4_clnt_odstate), 0, 0, NULL); | |
3335 | if (odstate_slab == NULL) | |
3336 | goto out_free_deleg_slab; | |
3337 | return 0; | |
3338 | ||
3339 | out_free_deleg_slab: | |
3340 | kmem_cache_destroy(deleg_slab); | |
3341 | out_free_stateid_slab: | |
3342 | kmem_cache_destroy(stateid_slab); | |
3343 | out_free_file_slab: | |
3344 | kmem_cache_destroy(file_slab); | |
3345 | out_free_lockowner_slab: | |
3346 | kmem_cache_destroy(lockowner_slab); | |
3347 | out_free_openowner_slab: | |
3348 | kmem_cache_destroy(openowner_slab); | |
3349 | out: | |
3350 | dprintk("nfsd4: out of memory while initializing nfsv4\n"); | |
3351 | return -ENOMEM; | |
3352 | } | |
3353 | ||
3354 | static void init_nfs4_replay(struct nfs4_replay *rp) | |
3355 | { | |
3356 | rp->rp_status = nfserr_serverfault; | |
3357 | rp->rp_buflen = 0; | |
3358 | rp->rp_buf = rp->rp_ibuf; | |
3359 | mutex_init(&rp->rp_mutex); | |
3360 | } | |
3361 | ||
3362 | static void nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate, | |
3363 | struct nfs4_stateowner *so) | |
3364 | { | |
3365 | if (!nfsd4_has_session(cstate)) { | |
3366 | mutex_lock(&so->so_replay.rp_mutex); | |
3367 | cstate->replay_owner = nfs4_get_stateowner(so); | |
3368 | } | |
3369 | } | |
3370 | ||
3371 | void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate) | |
3372 | { | |
3373 | struct nfs4_stateowner *so = cstate->replay_owner; | |
3374 | ||
3375 | if (so != NULL) { | |
3376 | cstate->replay_owner = NULL; | |
3377 | mutex_unlock(&so->so_replay.rp_mutex); | |
3378 | nfs4_put_stateowner(so); | |
3379 | } | |
3380 | } | |
3381 | ||
3382 | static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp) | |
3383 | { | |
3384 | struct nfs4_stateowner *sop; | |
3385 | ||
3386 | sop = kmem_cache_alloc(slab, GFP_KERNEL); | |
3387 | if (!sop) | |
3388 | return NULL; | |
3389 | ||
3390 | sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL); | |
3391 | if (!sop->so_owner.data) { | |
3392 | kmem_cache_free(slab, sop); | |
3393 | return NULL; | |
3394 | } | |
3395 | sop->so_owner.len = owner->len; | |
3396 | ||
3397 | INIT_LIST_HEAD(&sop->so_stateids); | |
3398 | sop->so_client = clp; | |
3399 | init_nfs4_replay(&sop->so_replay); | |
3400 | atomic_set(&sop->so_count, 1); | |
3401 | return sop; | |
3402 | } | |
3403 | ||
3404 | static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval) | |
3405 | { | |
3406 | lockdep_assert_held(&clp->cl_lock); | |
3407 | ||
3408 | list_add(&oo->oo_owner.so_strhash, | |
3409 | &clp->cl_ownerstr_hashtbl[strhashval]); | |
3410 | list_add(&oo->oo_perclient, &clp->cl_openowners); | |
3411 | } | |
3412 | ||
3413 | static void nfs4_unhash_openowner(struct nfs4_stateowner *so) | |
3414 | { | |
3415 | unhash_openowner_locked(openowner(so)); | |
3416 | } | |
3417 | ||
3418 | static void nfs4_free_openowner(struct nfs4_stateowner *so) | |
3419 | { | |
3420 | struct nfs4_openowner *oo = openowner(so); | |
3421 | ||
3422 | kmem_cache_free(openowner_slab, oo); | |
3423 | } | |
3424 | ||
3425 | static const struct nfs4_stateowner_operations openowner_ops = { | |
3426 | .so_unhash = nfs4_unhash_openowner, | |
3427 | .so_free = nfs4_free_openowner, | |
3428 | }; | |
3429 | ||
3430 | static struct nfs4_ol_stateid * | |
3431 | nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open) | |
3432 | { | |
3433 | struct nfs4_ol_stateid *local, *ret = NULL; | |
3434 | struct nfs4_openowner *oo = open->op_openowner; | |
3435 | ||
3436 | lockdep_assert_held(&fp->fi_lock); | |
3437 | ||
3438 | list_for_each_entry(local, &fp->fi_stateids, st_perfile) { | |
3439 | /* ignore lock owners */ | |
3440 | if (local->st_stateowner->so_is_open_owner == 0) | |
3441 | continue; | |
3442 | if (local->st_stateowner == &oo->oo_owner) { | |
3443 | ret = local; | |
3444 | atomic_inc(&ret->st_stid.sc_count); | |
3445 | break; | |
3446 | } | |
3447 | } | |
3448 | return ret; | |
3449 | } | |
3450 | ||
3451 | static struct nfs4_openowner * | |
3452 | alloc_init_open_stateowner(unsigned int strhashval, struct nfsd4_open *open, | |
3453 | struct nfsd4_compound_state *cstate) | |
3454 | { | |
3455 | struct nfs4_client *clp = cstate->clp; | |
3456 | struct nfs4_openowner *oo, *ret; | |
3457 | ||
3458 | oo = alloc_stateowner(openowner_slab, &open->op_owner, clp); | |
3459 | if (!oo) | |
3460 | return NULL; | |
3461 | oo->oo_owner.so_ops = &openowner_ops; | |
3462 | oo->oo_owner.so_is_open_owner = 1; | |
3463 | oo->oo_owner.so_seqid = open->op_seqid; | |
3464 | oo->oo_flags = 0; | |
3465 | if (nfsd4_has_session(cstate)) | |
3466 | oo->oo_flags |= NFS4_OO_CONFIRMED; | |
3467 | oo->oo_time = 0; | |
3468 | oo->oo_last_closed_stid = NULL; | |
3469 | INIT_LIST_HEAD(&oo->oo_close_lru); | |
3470 | spin_lock(&clp->cl_lock); | |
3471 | ret = find_openstateowner_str_locked(strhashval, open, clp); | |
3472 | if (ret == NULL) { | |
3473 | hash_openowner(oo, clp, strhashval); | |
3474 | ret = oo; | |
3475 | } else | |
3476 | nfs4_free_stateowner(&oo->oo_owner); | |
3477 | ||
3478 | spin_unlock(&clp->cl_lock); | |
3479 | return ret; | |
3480 | } | |
3481 | ||
3482 | static struct nfs4_ol_stateid * | |
3483 | init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, | |
3484 | struct nfsd4_open *open) | |
3485 | { | |
3486 | ||
3487 | struct nfs4_openowner *oo = open->op_openowner; | |
3488 | struct nfs4_ol_stateid *retstp = NULL; | |
3489 | ||
3490 | /* We are moving these outside of the spinlocks to avoid the warnings */ | |
3491 | mutex_init(&stp->st_mutex); | |
3492 | mutex_lock(&stp->st_mutex); | |
3493 | ||
3494 | spin_lock(&oo->oo_owner.so_client->cl_lock); | |
3495 | spin_lock(&fp->fi_lock); | |
3496 | ||
3497 | retstp = nfsd4_find_existing_open(fp, open); | |
3498 | if (retstp) | |
3499 | goto out_unlock; | |
3500 | atomic_inc(&stp->st_stid.sc_count); | |
3501 | stp->st_stid.sc_type = NFS4_OPEN_STID; | |
3502 | INIT_LIST_HEAD(&stp->st_locks); | |
3503 | stp->st_stateowner = nfs4_get_stateowner(&oo->oo_owner); | |
3504 | get_nfs4_file(fp); | |
3505 | stp->st_stid.sc_file = fp; | |
3506 | stp->st_access_bmap = 0; | |
3507 | stp->st_deny_bmap = 0; | |
3508 | stp->st_openstp = NULL; | |
3509 | list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids); | |
3510 | list_add(&stp->st_perfile, &fp->fi_stateids); | |
3511 | ||
3512 | out_unlock: | |
3513 | spin_unlock(&fp->fi_lock); | |
3514 | spin_unlock(&oo->oo_owner.so_client->cl_lock); | |
3515 | if (retstp) { | |
3516 | mutex_lock(&retstp->st_mutex); | |
3517 | /* Not that we need to, just for neatness */ | |
3518 | mutex_unlock(&stp->st_mutex); | |
3519 | } | |
3520 | return retstp; | |
3521 | } | |
3522 | ||
3523 | /* | |
3524 | * In the 4.0 case we need to keep the owners around a little while to handle | |
3525 | * CLOSE replay. We still do need to release any file access that is held by | |
3526 | * them before returning however. | |
3527 | */ | |
3528 | static void | |
3529 | move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net) | |
3530 | { | |
3531 | struct nfs4_ol_stateid *last; | |
3532 | struct nfs4_openowner *oo = openowner(s->st_stateowner); | |
3533 | struct nfsd_net *nn = net_generic(s->st_stid.sc_client->net, | |
3534 | nfsd_net_id); | |
3535 | ||
3536 | dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo); | |
3537 | ||
3538 | /* | |
3539 | * We know that we hold one reference via nfsd4_close, and another | |
3540 | * "persistent" reference for the client. If the refcount is higher | |
3541 | * than 2, then there are still calls in progress that are using this | |
3542 | * stateid. We can't put the sc_file reference until they are finished. | |
3543 | * Wait for the refcount to drop to 2. Since it has been unhashed, | |
3544 | * there should be no danger of the refcount going back up again at | |
3545 | * this point. | |
3546 | */ | |
3547 | wait_event(close_wq, atomic_read(&s->st_stid.sc_count) == 2); | |
3548 | ||
3549 | release_all_access(s); | |
3550 | if (s->st_stid.sc_file) { | |
3551 | put_nfs4_file(s->st_stid.sc_file); | |
3552 | s->st_stid.sc_file = NULL; | |
3553 | } | |
3554 | ||
3555 | spin_lock(&nn->client_lock); | |
3556 | last = oo->oo_last_closed_stid; | |
3557 | oo->oo_last_closed_stid = s; | |
3558 | list_move_tail(&oo->oo_close_lru, &nn->close_lru); | |
3559 | oo->oo_time = get_seconds(); | |
3560 | spin_unlock(&nn->client_lock); | |
3561 | if (last) | |
3562 | nfs4_put_stid(&last->st_stid); | |
3563 | } | |
3564 | ||
3565 | /* search file_hashtbl[] for file */ | |
3566 | static struct nfs4_file * | |
3567 | find_file_locked(struct knfsd_fh *fh, unsigned int hashval) | |
3568 | { | |
3569 | struct nfs4_file *fp; | |
3570 | ||
3571 | hlist_for_each_entry_rcu(fp, &file_hashtbl[hashval], fi_hash) { | |
3572 | if (fh_match(&fp->fi_fhandle, fh)) { | |
3573 | if (atomic_inc_not_zero(&fp->fi_ref)) | |
3574 | return fp; | |
3575 | } | |
3576 | } | |
3577 | return NULL; | |
3578 | } | |
3579 | ||
3580 | struct nfs4_file * | |
3581 | find_file(struct knfsd_fh *fh) | |
3582 | { | |
3583 | struct nfs4_file *fp; | |
3584 | unsigned int hashval = file_hashval(fh); | |
3585 | ||
3586 | rcu_read_lock(); | |
3587 | fp = find_file_locked(fh, hashval); | |
3588 | rcu_read_unlock(); | |
3589 | return fp; | |
3590 | } | |
3591 | ||
3592 | static struct nfs4_file * | |
3593 | find_or_add_file(struct nfs4_file *new, struct knfsd_fh *fh) | |
3594 | { | |
3595 | struct nfs4_file *fp; | |
3596 | unsigned int hashval = file_hashval(fh); | |
3597 | ||
3598 | rcu_read_lock(); | |
3599 | fp = find_file_locked(fh, hashval); | |
3600 | rcu_read_unlock(); | |
3601 | if (fp) | |
3602 | return fp; | |
3603 | ||
3604 | spin_lock(&state_lock); | |
3605 | fp = find_file_locked(fh, hashval); | |
3606 | if (likely(fp == NULL)) { | |
3607 | nfsd4_init_file(fh, hashval, new); | |
3608 | fp = new; | |
3609 | } | |
3610 | spin_unlock(&state_lock); | |
3611 | ||
3612 | return fp; | |
3613 | } | |
3614 | ||
3615 | /* | |
3616 | * Called to check deny when READ with all zero stateid or | |
3617 | * WRITE with all zero or all one stateid | |
3618 | */ | |
3619 | static __be32 | |
3620 | nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type) | |
3621 | { | |
3622 | struct nfs4_file *fp; | |
3623 | __be32 ret = nfs_ok; | |
3624 | ||
3625 | fp = find_file(¤t_fh->fh_handle); | |
3626 | if (!fp) | |
3627 | return ret; | |
3628 | /* Check for conflicting share reservations */ | |
3629 | spin_lock(&fp->fi_lock); | |
3630 | if (fp->fi_share_deny & deny_type) | |
3631 | ret = nfserr_locked; | |
3632 | spin_unlock(&fp->fi_lock); | |
3633 | put_nfs4_file(fp); | |
3634 | return ret; | |
3635 | } | |
3636 | ||
3637 | static void nfsd4_cb_recall_prepare(struct nfsd4_callback *cb) | |
3638 | { | |
3639 | struct nfs4_delegation *dp = cb_to_delegation(cb); | |
3640 | struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net, | |
3641 | nfsd_net_id); | |
3642 | ||
3643 | block_delegations(&dp->dl_stid.sc_file->fi_fhandle); | |
3644 | ||
3645 | /* | |
3646 | * We can't do this in nfsd_break_deleg_cb because it is | |
3647 | * already holding inode->i_lock. | |
3648 | * | |
3649 | * If the dl_time != 0, then we know that it has already been | |
3650 | * queued for a lease break. Don't queue it again. | |
3651 | */ | |
3652 | spin_lock(&state_lock); | |
3653 | if (dp->dl_time == 0) { | |
3654 | dp->dl_time = get_seconds(); | |
3655 | list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru); | |
3656 | } | |
3657 | spin_unlock(&state_lock); | |
3658 | } | |
3659 | ||
3660 | static int nfsd4_cb_recall_done(struct nfsd4_callback *cb, | |
3661 | struct rpc_task *task) | |
3662 | { | |
3663 | struct nfs4_delegation *dp = cb_to_delegation(cb); | |
3664 | ||
3665 | if (dp->dl_stid.sc_type == NFS4_CLOSED_DELEG_STID) | |
3666 | return 1; | |
3667 | ||
3668 | switch (task->tk_status) { | |
3669 | case 0: | |
3670 | return 1; | |
3671 | case -EBADHANDLE: | |
3672 | case -NFS4ERR_BAD_STATEID: | |
3673 | /* | |
3674 | * Race: client probably got cb_recall before open reply | |
3675 | * granting delegation. | |
3676 | */ | |
3677 | if (dp->dl_retries--) { | |
3678 | rpc_delay(task, 2 * HZ); | |
3679 | return 0; | |
3680 | } | |
3681 | /*FALLTHRU*/ | |
3682 | default: | |
3683 | return -1; | |
3684 | } | |
3685 | } | |
3686 | ||
3687 | static void nfsd4_cb_recall_release(struct nfsd4_callback *cb) | |
3688 | { | |
3689 | struct nfs4_delegation *dp = cb_to_delegation(cb); | |
3690 | ||
3691 | nfs4_put_stid(&dp->dl_stid); | |
3692 | } | |
3693 | ||
3694 | static const struct nfsd4_callback_ops nfsd4_cb_recall_ops = { | |
3695 | .prepare = nfsd4_cb_recall_prepare, | |
3696 | .done = nfsd4_cb_recall_done, | |
3697 | .release = nfsd4_cb_recall_release, | |
3698 | }; | |
3699 | ||
3700 | static void nfsd_break_one_deleg(struct nfs4_delegation *dp) | |
3701 | { | |
3702 | /* | |
3703 | * We're assuming the state code never drops its reference | |
3704 | * without first removing the lease. Since we're in this lease | |
3705 | * callback (and since the lease code is serialized by the kernel | |
3706 | * lock) we know the server hasn't removed the lease yet, we know | |
3707 | * it's safe to take a reference. | |
3708 | */ | |
3709 | atomic_inc(&dp->dl_stid.sc_count); | |
3710 | nfsd4_run_cb(&dp->dl_recall); | |
3711 | } | |
3712 | ||
3713 | /* Called from break_lease() with i_lock held. */ | |
3714 | static bool | |
3715 | nfsd_break_deleg_cb(struct file_lock *fl) | |
3716 | { | |
3717 | bool ret = false; | |
3718 | struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner; | |
3719 | struct nfs4_delegation *dp; | |
3720 | ||
3721 | if (!fp) { | |
3722 | WARN(1, "(%p)->fl_owner NULL\n", fl); | |
3723 | return ret; | |
3724 | } | |
3725 | if (fp->fi_had_conflict) { | |
3726 | WARN(1, "duplicate break on %p\n", fp); | |
3727 | return ret; | |
3728 | } | |
3729 | /* | |
3730 | * We don't want the locks code to timeout the lease for us; | |
3731 | * we'll remove it ourself if a delegation isn't returned | |
3732 | * in time: | |
3733 | */ | |
3734 | fl->fl_break_time = 0; | |
3735 | ||
3736 | spin_lock(&fp->fi_lock); | |
3737 | fp->fi_had_conflict = true; | |
3738 | /* | |
3739 | * If there are no delegations on the list, then return true | |
3740 | * so that the lease code will go ahead and delete it. | |
3741 | */ | |
3742 | if (list_empty(&fp->fi_delegations)) | |
3743 | ret = true; | |
3744 | else | |
3745 | list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) | |
3746 | nfsd_break_one_deleg(dp); | |
3747 | spin_unlock(&fp->fi_lock); | |
3748 | return ret; | |
3749 | } | |
3750 | ||
3751 | static int | |
3752 | nfsd_change_deleg_cb(struct file_lock *onlist, int arg, | |
3753 | struct list_head *dispose) | |
3754 | { | |
3755 | if (arg & F_UNLCK) | |
3756 | return lease_modify(onlist, arg, dispose); | |
3757 | else | |
3758 | return -EAGAIN; | |
3759 | } | |
3760 | ||
3761 | static const struct lock_manager_operations nfsd_lease_mng_ops = { | |
3762 | .lm_break = nfsd_break_deleg_cb, | |
3763 | .lm_change = nfsd_change_deleg_cb, | |
3764 | }; | |
3765 | ||
3766 | static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid) | |
3767 | { | |
3768 | if (nfsd4_has_session(cstate)) | |
3769 | return nfs_ok; | |
3770 | if (seqid == so->so_seqid - 1) | |
3771 | return nfserr_replay_me; | |
3772 | if (seqid == so->so_seqid) | |
3773 | return nfs_ok; | |
3774 | return nfserr_bad_seqid; | |
3775 | } | |
3776 | ||
3777 | static __be32 lookup_clientid(clientid_t *clid, | |
3778 | struct nfsd4_compound_state *cstate, | |
3779 | struct nfsd_net *nn) | |
3780 | { | |
3781 | struct nfs4_client *found; | |
3782 | ||
3783 | if (cstate->clp) { | |
3784 | found = cstate->clp; | |
3785 | if (!same_clid(&found->cl_clientid, clid)) | |
3786 | return nfserr_stale_clientid; | |
3787 | return nfs_ok; | |
3788 | } | |
3789 | ||
3790 | if (STALE_CLIENTID(clid, nn)) | |
3791 | return nfserr_stale_clientid; | |
3792 | ||
3793 | /* | |
3794 | * For v4.1+ we get the client in the SEQUENCE op. If we don't have one | |
3795 | * cached already then we know this is for is for v4.0 and "sessions" | |
3796 | * will be false. | |
3797 | */ | |
3798 | WARN_ON_ONCE(cstate->session); | |
3799 | spin_lock(&nn->client_lock); | |
3800 | found = find_confirmed_client(clid, false, nn); | |
3801 | if (!found) { | |
3802 | spin_unlock(&nn->client_lock); | |
3803 | return nfserr_expired; | |
3804 | } | |
3805 | atomic_inc(&found->cl_refcount); | |
3806 | spin_unlock(&nn->client_lock); | |
3807 | ||
3808 | /* Cache the nfs4_client in cstate! */ | |
3809 | cstate->clp = found; | |
3810 | return nfs_ok; | |
3811 | } | |
3812 | ||
3813 | __be32 | |
3814 | nfsd4_process_open1(struct nfsd4_compound_state *cstate, | |
3815 | struct nfsd4_open *open, struct nfsd_net *nn) | |
3816 | { | |
3817 | clientid_t *clientid = &open->op_clientid; | |
3818 | struct nfs4_client *clp = NULL; | |
3819 | unsigned int strhashval; | |
3820 | struct nfs4_openowner *oo = NULL; | |
3821 | __be32 status; | |
3822 | ||
3823 | if (STALE_CLIENTID(&open->op_clientid, nn)) | |
3824 | return nfserr_stale_clientid; | |
3825 | /* | |
3826 | * In case we need it later, after we've already created the | |
3827 | * file and don't want to risk a further failure: | |
3828 | */ | |
3829 | open->op_file = nfsd4_alloc_file(); | |
3830 | if (open->op_file == NULL) | |
3831 | return nfserr_jukebox; | |
3832 | ||
3833 | status = lookup_clientid(clientid, cstate, nn); | |
3834 | if (status) | |
3835 | return status; | |
3836 | clp = cstate->clp; | |
3837 | ||
3838 | strhashval = ownerstr_hashval(&open->op_owner); | |
3839 | oo = find_openstateowner_str(strhashval, open, clp); | |
3840 | open->op_openowner = oo; | |
3841 | if (!oo) { | |
3842 | goto new_owner; | |
3843 | } | |
3844 | if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) { | |
3845 | /* Replace unconfirmed owners without checking for replay. */ | |
3846 | release_openowner(oo); | |
3847 | open->op_openowner = NULL; | |
3848 | goto new_owner; | |
3849 | } | |
3850 | status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid); | |
3851 | if (status) | |
3852 | return status; | |
3853 | goto alloc_stateid; | |
3854 | new_owner: | |
3855 | oo = alloc_init_open_stateowner(strhashval, open, cstate); | |
3856 | if (oo == NULL) | |
3857 | return nfserr_jukebox; | |
3858 | open->op_openowner = oo; | |
3859 | alloc_stateid: | |
3860 | open->op_stp = nfs4_alloc_open_stateid(clp); | |
3861 | if (!open->op_stp) | |
3862 | return nfserr_jukebox; | |
3863 | ||
3864 | if (nfsd4_has_session(cstate) && | |
3865 | (cstate->current_fh.fh_export->ex_flags & NFSEXP_PNFS)) { | |
3866 | open->op_odstate = alloc_clnt_odstate(clp); | |
3867 | if (!open->op_odstate) | |
3868 | return nfserr_jukebox; | |
3869 | } | |
3870 | ||
3871 | return nfs_ok; | |
3872 | } | |
3873 | ||
3874 | static inline __be32 | |
3875 | nfs4_check_delegmode(struct nfs4_delegation *dp, int flags) | |
3876 | { | |
3877 | if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ)) | |
3878 | return nfserr_openmode; | |
3879 | else | |
3880 | return nfs_ok; | |
3881 | } | |
3882 | ||
3883 | static int share_access_to_flags(u32 share_access) | |
3884 | { | |
3885 | return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE; | |
3886 | } | |
3887 | ||
3888 | static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s) | |
3889 | { | |
3890 | struct nfs4_stid *ret; | |
3891 | ||
3892 | ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID); | |
3893 | if (!ret) | |
3894 | return NULL; | |
3895 | return delegstateid(ret); | |
3896 | } | |
3897 | ||
3898 | static bool nfsd4_is_deleg_cur(struct nfsd4_open *open) | |
3899 | { | |
3900 | return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR || | |
3901 | open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH; | |
3902 | } | |
3903 | ||
3904 | static __be32 | |
3905 | nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open, | |
3906 | struct nfs4_delegation **dp) | |
3907 | { | |
3908 | int flags; | |
3909 | __be32 status = nfserr_bad_stateid; | |
3910 | struct nfs4_delegation *deleg; | |
3911 | ||
3912 | deleg = find_deleg_stateid(cl, &open->op_delegate_stateid); | |
3913 | if (deleg == NULL) | |
3914 | goto out; | |
3915 | flags = share_access_to_flags(open->op_share_access); | |
3916 | status = nfs4_check_delegmode(deleg, flags); | |
3917 | if (status) { | |
3918 | nfs4_put_stid(&deleg->dl_stid); | |
3919 | goto out; | |
3920 | } | |
3921 | *dp = deleg; | |
3922 | out: | |
3923 | if (!nfsd4_is_deleg_cur(open)) | |
3924 | return nfs_ok; | |
3925 | if (status) | |
3926 | return status; | |
3927 | open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED; | |
3928 | return nfs_ok; | |
3929 | } | |
3930 | ||
3931 | static inline int nfs4_access_to_access(u32 nfs4_access) | |
3932 | { | |
3933 | int flags = 0; | |
3934 | ||
3935 | if (nfs4_access & NFS4_SHARE_ACCESS_READ) | |
3936 | flags |= NFSD_MAY_READ; | |
3937 | if (nfs4_access & NFS4_SHARE_ACCESS_WRITE) | |
3938 | flags |= NFSD_MAY_WRITE; | |
3939 | return flags; | |
3940 | } | |
3941 | ||
3942 | static inline __be32 | |
3943 | nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh, | |
3944 | struct nfsd4_open *open) | |
3945 | { | |
3946 | struct iattr iattr = { | |
3947 | .ia_valid = ATTR_SIZE, | |
3948 | .ia_size = 0, | |
3949 | }; | |
3950 | if (!open->op_truncate) | |
3951 | return 0; | |
3952 | if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE)) | |
3953 | return nfserr_inval; | |
3954 | return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0); | |
3955 | } | |
3956 | ||
3957 | static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp, | |
3958 | struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp, | |
3959 | struct nfsd4_open *open) | |
3960 | { | |
3961 | struct file *filp = NULL; | |
3962 | __be32 status; | |
3963 | int oflag = nfs4_access_to_omode(open->op_share_access); | |
3964 | int access = nfs4_access_to_access(open->op_share_access); | |
3965 | unsigned char old_access_bmap, old_deny_bmap; | |
3966 | ||
3967 | spin_lock(&fp->fi_lock); | |
3968 | ||
3969 | /* | |
3970 | * Are we trying to set a deny mode that would conflict with | |
3971 | * current access? | |
3972 | */ | |
3973 | status = nfs4_file_check_deny(fp, open->op_share_deny); | |
3974 | if (status != nfs_ok) { | |
3975 | spin_unlock(&fp->fi_lock); | |
3976 | goto out; | |
3977 | } | |
3978 | ||
3979 | /* set access to the file */ | |
3980 | status = nfs4_file_get_access(fp, open->op_share_access); | |
3981 | if (status != nfs_ok) { | |
3982 | spin_unlock(&fp->fi_lock); | |
3983 | goto out; | |
3984 | } | |
3985 | ||
3986 | /* Set access bits in stateid */ | |
3987 | old_access_bmap = stp->st_access_bmap; | |
3988 | set_access(open->op_share_access, stp); | |
3989 | ||
3990 | /* Set new deny mask */ | |
3991 | old_deny_bmap = stp->st_deny_bmap; | |
3992 | set_deny(open->op_share_deny, stp); | |
3993 | fp->fi_share_deny |= (open->op_share_deny & NFS4_SHARE_DENY_BOTH); | |
3994 | ||
3995 | if (!fp->fi_fds[oflag]) { | |
3996 | spin_unlock(&fp->fi_lock); | |
3997 | status = nfsd_open(rqstp, cur_fh, S_IFREG, access, &filp); | |
3998 | if (status) | |
3999 | goto out_put_access; | |
4000 | spin_lock(&fp->fi_lock); | |
4001 | if (!fp->fi_fds[oflag]) { | |
4002 | fp->fi_fds[oflag] = filp; | |
4003 | filp = NULL; | |
4004 | } | |
4005 | } | |
4006 | spin_unlock(&fp->fi_lock); | |
4007 | if (filp) | |
4008 | fput(filp); | |
4009 | ||
4010 | status = nfsd4_truncate(rqstp, cur_fh, open); | |
4011 | if (status) | |
4012 | goto out_put_access; | |
4013 | out: | |
4014 | return status; | |
4015 | out_put_access: | |
4016 | stp->st_access_bmap = old_access_bmap; | |
4017 | nfs4_file_put_access(fp, open->op_share_access); | |
4018 | reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap), stp); | |
4019 | goto out; | |
4020 | } | |
4021 | ||
4022 | static __be32 | |
4023 | nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp, struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp, struct nfsd4_open *open) | |
4024 | { | |
4025 | __be32 status; | |
4026 | unsigned char old_deny_bmap = stp->st_deny_bmap; | |
4027 | ||
4028 | if (!test_access(open->op_share_access, stp)) | |
4029 | return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open); | |
4030 | ||
4031 | /* test and set deny mode */ | |
4032 | spin_lock(&fp->fi_lock); | |
4033 | status = nfs4_file_check_deny(fp, open->op_share_deny); | |
4034 | if (status == nfs_ok) { | |
4035 | set_deny(open->op_share_deny, stp); | |
4036 | fp->fi_share_deny |= | |
4037 | (open->op_share_deny & NFS4_SHARE_DENY_BOTH); | |
4038 | } | |
4039 | spin_unlock(&fp->fi_lock); | |
4040 | ||
4041 | if (status != nfs_ok) | |
4042 | return status; | |
4043 | ||
4044 | status = nfsd4_truncate(rqstp, cur_fh, open); | |
4045 | if (status != nfs_ok) | |
4046 | reset_union_bmap_deny(old_deny_bmap, stp); | |
4047 | return status; | |
4048 | } | |
4049 | ||
4050 | /* Should we give out recallable state?: */ | |
4051 | static bool nfsd4_cb_channel_good(struct nfs4_client *clp) | |
4052 | { | |
4053 | if (clp->cl_cb_state == NFSD4_CB_UP) | |
4054 | return true; | |
4055 | /* | |
4056 | * In the sessions case, since we don't have to establish a | |
4057 | * separate connection for callbacks, we assume it's OK | |
4058 | * until we hear otherwise: | |
4059 | */ | |
4060 | return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN; | |
4061 | } | |
4062 | ||
4063 | static struct file_lock *nfs4_alloc_init_lease(struct nfs4_file *fp, int flag) | |
4064 | { | |
4065 | struct file_lock *fl; | |
4066 | ||
4067 | fl = locks_alloc_lock(); | |
4068 | if (!fl) | |
4069 | return NULL; | |
4070 | fl->fl_lmops = &nfsd_lease_mng_ops; | |
4071 | fl->fl_flags = FL_DELEG; | |
4072 | fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK; | |
4073 | fl->fl_end = OFFSET_MAX; | |
4074 | fl->fl_owner = (fl_owner_t)fp; | |
4075 | fl->fl_pid = current->tgid; | |
4076 | return fl; | |
4077 | } | |
4078 | ||
4079 | /** | |
4080 | * nfs4_setlease - Obtain a delegation by requesting lease from vfs layer | |
4081 | * @dp: a pointer to the nfs4_delegation we're adding. | |
4082 | * | |
4083 | * Return: | |
4084 | * On success: Return code will be 0 on success. | |
4085 | * | |
4086 | * On error: -EAGAIN if there was an existing delegation. | |
4087 | * nonzero if there is an error in other cases. | |
4088 | * | |
4089 | */ | |
4090 | ||
4091 | static int nfs4_setlease(struct nfs4_delegation *dp) | |
4092 | { | |
4093 | struct nfs4_file *fp = dp->dl_stid.sc_file; | |
4094 | struct file_lock *fl; | |
4095 | struct file *filp; | |
4096 | int status = 0; | |
4097 | ||
4098 | fl = nfs4_alloc_init_lease(fp, NFS4_OPEN_DELEGATE_READ); | |
4099 | if (!fl) | |
4100 | return -ENOMEM; | |
4101 | filp = find_readable_file(fp); | |
4102 | if (!filp) { | |
4103 | /* We should always have a readable file here */ | |
4104 | WARN_ON_ONCE(1); | |
4105 | locks_free_lock(fl); | |
4106 | return -EBADF; | |
4107 | } | |
4108 | fl->fl_file = filp; | |
4109 | status = vfs_setlease(filp, fl->fl_type, &fl, NULL); | |
4110 | if (fl) | |
4111 | locks_free_lock(fl); | |
4112 | if (status) | |
4113 | goto out_fput; | |
4114 | spin_lock(&state_lock); | |
4115 | spin_lock(&fp->fi_lock); | |
4116 | /* Did the lease get broken before we took the lock? */ | |
4117 | status = -EAGAIN; | |
4118 | if (fp->fi_had_conflict) | |
4119 | goto out_unlock; | |
4120 | /* Race breaker */ | |
4121 | if (fp->fi_deleg_file) { | |
4122 | status = hash_delegation_locked(dp, fp); | |
4123 | goto out_unlock; | |
4124 | } | |
4125 | fp->fi_deleg_file = filp; | |
4126 | fp->fi_delegees = 0; | |
4127 | status = hash_delegation_locked(dp, fp); | |
4128 | spin_unlock(&fp->fi_lock); | |
4129 | spin_unlock(&state_lock); | |
4130 | if (status) { | |
4131 | /* Should never happen, this is a new fi_deleg_file */ | |
4132 | WARN_ON_ONCE(1); | |
4133 | goto out_fput; | |
4134 | } | |
4135 | return 0; | |
4136 | out_unlock: | |
4137 | spin_unlock(&fp->fi_lock); | |
4138 | spin_unlock(&state_lock); | |
4139 | out_fput: | |
4140 | fput(filp); | |
4141 | return status; | |
4142 | } | |
4143 | ||
4144 | static struct nfs4_delegation * | |
4145 | nfs4_set_delegation(struct nfs4_client *clp, struct svc_fh *fh, | |
4146 | struct nfs4_file *fp, struct nfs4_clnt_odstate *odstate) | |
4147 | { | |
4148 | int status; | |
4149 | struct nfs4_delegation *dp; | |
4150 | ||
4151 | if (fp->fi_had_conflict) | |
4152 | return ERR_PTR(-EAGAIN); | |
4153 | ||
4154 | spin_lock(&state_lock); | |
4155 | spin_lock(&fp->fi_lock); | |
4156 | status = nfs4_get_existing_delegation(clp, fp); | |
4157 | spin_unlock(&fp->fi_lock); | |
4158 | spin_unlock(&state_lock); | |
4159 | ||
4160 | if (status) | |
4161 | return ERR_PTR(status); | |
4162 | ||
4163 | dp = alloc_init_deleg(clp, fh, odstate); | |
4164 | if (!dp) | |
4165 | return ERR_PTR(-ENOMEM); | |
4166 | ||
4167 | get_nfs4_file(fp); | |
4168 | spin_lock(&state_lock); | |
4169 | spin_lock(&fp->fi_lock); | |
4170 | dp->dl_stid.sc_file = fp; | |
4171 | if (!fp->fi_deleg_file) { | |
4172 | spin_unlock(&fp->fi_lock); | |
4173 | spin_unlock(&state_lock); | |
4174 | status = nfs4_setlease(dp); | |
4175 | goto out; | |
4176 | } | |
4177 | if (fp->fi_had_conflict) { | |
4178 | status = -EAGAIN; | |
4179 | goto out_unlock; | |
4180 | } | |
4181 | status = hash_delegation_locked(dp, fp); | |
4182 | out_unlock: | |
4183 | spin_unlock(&fp->fi_lock); | |
4184 | spin_unlock(&state_lock); | |
4185 | out: | |
4186 | if (status) { | |
4187 | put_clnt_odstate(dp->dl_clnt_odstate); | |
4188 | nfs4_put_stid(&dp->dl_stid); | |
4189 | return ERR_PTR(status); | |
4190 | } | |
4191 | return dp; | |
4192 | } | |
4193 | ||
4194 | static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status) | |
4195 | { | |
4196 | open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT; | |
4197 | if (status == -EAGAIN) | |
4198 | open->op_why_no_deleg = WND4_CONTENTION; | |
4199 | else { | |
4200 | open->op_why_no_deleg = WND4_RESOURCE; | |
4201 | switch (open->op_deleg_want) { | |
4202 | case NFS4_SHARE_WANT_READ_DELEG: | |
4203 | case NFS4_SHARE_WANT_WRITE_DELEG: | |
4204 | case NFS4_SHARE_WANT_ANY_DELEG: | |
4205 | break; | |
4206 | case NFS4_SHARE_WANT_CANCEL: | |
4207 | open->op_why_no_deleg = WND4_CANCELLED; | |
4208 | break; | |
4209 | case NFS4_SHARE_WANT_NO_DELEG: | |
4210 | WARN_ON_ONCE(1); | |
4211 | } | |
4212 | } | |
4213 | } | |
4214 | ||
4215 | /* | |
4216 | * Attempt to hand out a delegation. | |
4217 | * | |
4218 | * Note we don't support write delegations, and won't until the vfs has | |
4219 | * proper support for them. | |
4220 | */ | |
4221 | static void | |
4222 | nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, | |
4223 | struct nfs4_ol_stateid *stp) | |
4224 | { | |
4225 | struct nfs4_delegation *dp; | |
4226 | struct nfs4_openowner *oo = openowner(stp->st_stateowner); | |
4227 | struct nfs4_client *clp = stp->st_stid.sc_client; | |
4228 | int cb_up; | |
4229 | int status = 0; | |
4230 | ||
4231 | cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client); | |
4232 | open->op_recall = 0; | |
4233 | switch (open->op_claim_type) { | |
4234 | case NFS4_OPEN_CLAIM_PREVIOUS: | |
4235 | if (!cb_up) | |
4236 | open->op_recall = 1; | |
4237 | if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ) | |
4238 | goto out_no_deleg; | |
4239 | break; | |
4240 | case NFS4_OPEN_CLAIM_NULL: | |
4241 | case NFS4_OPEN_CLAIM_FH: | |
4242 | /* | |
4243 | * Let's not give out any delegations till everyone's | |
4244 | * had the chance to reclaim theirs, *and* until | |
4245 | * NLM locks have all been reclaimed: | |
4246 | */ | |
4247 | if (locks_in_grace(clp->net)) | |
4248 | goto out_no_deleg; | |
4249 | if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED)) | |
4250 | goto out_no_deleg; | |
4251 | /* | |
4252 | * Also, if the file was opened for write or | |
4253 | * create, there's a good chance the client's | |
4254 | * about to write to it, resulting in an | |
4255 | * immediate recall (since we don't support | |
4256 | * write delegations): | |
4257 | */ | |
4258 | if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) | |
4259 | goto out_no_deleg; | |
4260 | if (open->op_create == NFS4_OPEN_CREATE) | |
4261 | goto out_no_deleg; | |
4262 | break; | |
4263 | default: | |
4264 | goto out_no_deleg; | |
4265 | } | |
4266 | dp = nfs4_set_delegation(clp, fh, stp->st_stid.sc_file, stp->st_clnt_odstate); | |
4267 | if (IS_ERR(dp)) | |
4268 | goto out_no_deleg; | |
4269 | ||
4270 | memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid)); | |
4271 | ||
4272 | dprintk("NFSD: delegation stateid=" STATEID_FMT "\n", | |
4273 | STATEID_VAL(&dp->dl_stid.sc_stateid)); | |
4274 | open->op_delegate_type = NFS4_OPEN_DELEGATE_READ; | |
4275 | nfs4_put_stid(&dp->dl_stid); | |
4276 | return; | |
4277 | out_no_deleg: | |
4278 | open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE; | |
4279 | if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS && | |
4280 | open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) { | |
4281 | dprintk("NFSD: WARNING: refusing delegation reclaim\n"); | |
4282 | open->op_recall = 1; | |
4283 | } | |
4284 | ||
4285 | /* 4.1 client asking for a delegation? */ | |
4286 | if (open->op_deleg_want) | |
4287 | nfsd4_open_deleg_none_ext(open, status); | |
4288 | return; | |
4289 | } | |
4290 | ||
4291 | static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open, | |
4292 | struct nfs4_delegation *dp) | |
4293 | { | |
4294 | if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG && | |
4295 | dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) { | |
4296 | open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT; | |
4297 | open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE; | |
4298 | } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG && | |
4299 | dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) { | |
4300 | open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT; | |
4301 | open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE; | |
4302 | } | |
4303 | /* Otherwise the client must be confused wanting a delegation | |
4304 | * it already has, therefore we don't return | |
4305 | * NFS4_OPEN_DELEGATE_NONE_EXT and reason. | |
4306 | */ | |
4307 | } | |
4308 | ||
4309 | __be32 | |
4310 | nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open) | |
4311 | { | |
4312 | struct nfsd4_compoundres *resp = rqstp->rq_resp; | |
4313 | struct nfs4_client *cl = open->op_openowner->oo_owner.so_client; | |
4314 | struct nfs4_file *fp = NULL; | |
4315 | struct nfs4_ol_stateid *stp = NULL; | |
4316 | struct nfs4_ol_stateid *swapstp = NULL; | |
4317 | struct nfs4_delegation *dp = NULL; | |
4318 | __be32 status; | |
4319 | ||
4320 | /* | |
4321 | * Lookup file; if found, lookup stateid and check open request, | |
4322 | * and check for delegations in the process of being recalled. | |
4323 | * If not found, create the nfs4_file struct | |
4324 | */ | |
4325 | fp = find_or_add_file(open->op_file, ¤t_fh->fh_handle); | |
4326 | if (fp != open->op_file) { | |
4327 | status = nfs4_check_deleg(cl, open, &dp); | |
4328 | if (status) | |
4329 | goto out; | |
4330 | spin_lock(&fp->fi_lock); | |
4331 | stp = nfsd4_find_existing_open(fp, open); | |
4332 | spin_unlock(&fp->fi_lock); | |
4333 | } else { | |
4334 | open->op_file = NULL; | |
4335 | status = nfserr_bad_stateid; | |
4336 | if (nfsd4_is_deleg_cur(open)) | |
4337 | goto out; | |
4338 | } | |
4339 | ||
4340 | /* | |
4341 | * OPEN the file, or upgrade an existing OPEN. | |
4342 | * If truncate fails, the OPEN fails. | |
4343 | */ | |
4344 | if (stp) { | |
4345 | /* Stateid was found, this is an OPEN upgrade */ | |
4346 | mutex_lock(&stp->st_mutex); | |
4347 | status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open); | |
4348 | if (status) { | |
4349 | mutex_unlock(&stp->st_mutex); | |
4350 | goto out; | |
4351 | } | |
4352 | } else { | |
4353 | stp = open->op_stp; | |
4354 | open->op_stp = NULL; | |
4355 | /* | |
4356 | * init_open_stateid() either returns a locked stateid | |
4357 | * it found, or initializes and locks the new one we passed in | |
4358 | */ | |
4359 | swapstp = init_open_stateid(stp, fp, open); | |
4360 | if (swapstp) { | |
4361 | nfs4_put_stid(&stp->st_stid); | |
4362 | stp = swapstp; | |
4363 | status = nfs4_upgrade_open(rqstp, fp, current_fh, | |
4364 | stp, open); | |
4365 | if (status) { | |
4366 | mutex_unlock(&stp->st_mutex); | |
4367 | goto out; | |
4368 | } | |
4369 | goto upgrade_out; | |
4370 | } | |
4371 | status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open); | |
4372 | if (status) { | |
4373 | mutex_unlock(&stp->st_mutex); | |
4374 | release_open_stateid(stp); | |
4375 | goto out; | |
4376 | } | |
4377 | ||
4378 | stp->st_clnt_odstate = find_or_hash_clnt_odstate(fp, | |
4379 | open->op_odstate); | |
4380 | if (stp->st_clnt_odstate == open->op_odstate) | |
4381 | open->op_odstate = NULL; | |
4382 | } | |
4383 | upgrade_out: | |
4384 | nfs4_inc_and_copy_stateid(&open->op_stateid, &stp->st_stid); | |
4385 | mutex_unlock(&stp->st_mutex); | |
4386 | ||
4387 | if (nfsd4_has_session(&resp->cstate)) { | |
4388 | if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) { | |
4389 | open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT; | |
4390 | open->op_why_no_deleg = WND4_NOT_WANTED; | |
4391 | goto nodeleg; | |
4392 | } | |
4393 | } | |
4394 | ||
4395 | /* | |
4396 | * Attempt to hand out a delegation. No error return, because the | |
4397 | * OPEN succeeds even if we fail. | |
4398 | */ | |
4399 | nfs4_open_delegation(current_fh, open, stp); | |
4400 | nodeleg: | |
4401 | status = nfs_ok; | |
4402 | ||
4403 | dprintk("%s: stateid=" STATEID_FMT "\n", __func__, | |
4404 | STATEID_VAL(&stp->st_stid.sc_stateid)); | |
4405 | out: | |
4406 | /* 4.1 client trying to upgrade/downgrade delegation? */ | |
4407 | if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp && | |
4408 | open->op_deleg_want) | |
4409 | nfsd4_deleg_xgrade_none_ext(open, dp); | |
4410 | ||
4411 | if (fp) | |
4412 | put_nfs4_file(fp); | |
4413 | if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) | |
4414 | open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED; | |
4415 | /* | |
4416 | * To finish the open response, we just need to set the rflags. | |
4417 | */ | |
4418 | open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX; | |
4419 | if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) && | |
4420 | !nfsd4_has_session(&resp->cstate)) | |
4421 | open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM; | |
4422 | if (dp) | |
4423 | nfs4_put_stid(&dp->dl_stid); | |
4424 | if (stp) | |
4425 | nfs4_put_stid(&stp->st_stid); | |
4426 | ||
4427 | return status; | |
4428 | } | |
4429 | ||
4430 | void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate, | |
4431 | struct nfsd4_open *open) | |
4432 | { | |
4433 | if (open->op_openowner) { | |
4434 | struct nfs4_stateowner *so = &open->op_openowner->oo_owner; | |
4435 | ||
4436 | nfsd4_cstate_assign_replay(cstate, so); | |
4437 | nfs4_put_stateowner(so); | |
4438 | } | |
4439 | if (open->op_file) | |
4440 | kmem_cache_free(file_slab, open->op_file); | |
4441 | if (open->op_stp) | |
4442 | nfs4_put_stid(&open->op_stp->st_stid); | |
4443 | if (open->op_odstate) | |
4444 | kmem_cache_free(odstate_slab, open->op_odstate); | |
4445 | } | |
4446 | ||
4447 | __be32 | |
4448 | nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, | |
4449 | clientid_t *clid) | |
4450 | { | |
4451 | struct nfs4_client *clp; | |
4452 | __be32 status; | |
4453 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
4454 | ||
4455 | dprintk("process_renew(%08x/%08x): starting\n", | |
4456 | clid->cl_boot, clid->cl_id); | |
4457 | status = lookup_clientid(clid, cstate, nn); | |
4458 | if (status) | |
4459 | goto out; | |
4460 | clp = cstate->clp; | |
4461 | status = nfserr_cb_path_down; | |
4462 | if (!list_empty(&clp->cl_delegations) | |
4463 | && clp->cl_cb_state != NFSD4_CB_UP) | |
4464 | goto out; | |
4465 | status = nfs_ok; | |
4466 | out: | |
4467 | return status; | |
4468 | } | |
4469 | ||
4470 | void | |
4471 | nfsd4_end_grace(struct nfsd_net *nn) | |
4472 | { | |
4473 | /* do nothing if grace period already ended */ | |
4474 | if (nn->grace_ended) | |
4475 | return; | |
4476 | ||
4477 | dprintk("NFSD: end of grace period\n"); | |
4478 | nn->grace_ended = true; | |
4479 | /* | |
4480 | * If the server goes down again right now, an NFSv4 | |
4481 | * client will still be allowed to reclaim after it comes back up, | |
4482 | * even if it hasn't yet had a chance to reclaim state this time. | |
4483 | * | |
4484 | */ | |
4485 | nfsd4_record_grace_done(nn); | |
4486 | /* | |
4487 | * At this point, NFSv4 clients can still reclaim. But if the | |
4488 | * server crashes, any that have not yet reclaimed will be out | |
4489 | * of luck on the next boot. | |
4490 | * | |
4491 | * (NFSv4.1+ clients are considered to have reclaimed once they | |
4492 | * call RECLAIM_COMPLETE. NFSv4.0 clients are considered to | |
4493 | * have reclaimed after their first OPEN.) | |
4494 | */ | |
4495 | locks_end_grace(&nn->nfsd4_manager); | |
4496 | /* | |
4497 | * At this point, and once lockd and/or any other containers | |
4498 | * exit their grace period, further reclaims will fail and | |
4499 | * regular locking can resume. | |
4500 | */ | |
4501 | } | |
4502 | ||
4503 | static time_t | |
4504 | nfs4_laundromat(struct nfsd_net *nn) | |
4505 | { | |
4506 | struct nfs4_client *clp; | |
4507 | struct nfs4_openowner *oo; | |
4508 | struct nfs4_delegation *dp; | |
4509 | struct nfs4_ol_stateid *stp; | |
4510 | struct list_head *pos, *next, reaplist; | |
4511 | time_t cutoff = get_seconds() - nn->nfsd4_lease; | |
4512 | time_t t, new_timeo = nn->nfsd4_lease; | |
4513 | ||
4514 | dprintk("NFSD: laundromat service - starting\n"); | |
4515 | nfsd4_end_grace(nn); | |
4516 | INIT_LIST_HEAD(&reaplist); | |
4517 | spin_lock(&nn->client_lock); | |
4518 | list_for_each_safe(pos, next, &nn->client_lru) { | |
4519 | clp = list_entry(pos, struct nfs4_client, cl_lru); | |
4520 | if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) { | |
4521 | t = clp->cl_time - cutoff; | |
4522 | new_timeo = min(new_timeo, t); | |
4523 | break; | |
4524 | } | |
4525 | if (mark_client_expired_locked(clp)) { | |
4526 | dprintk("NFSD: client in use (clientid %08x)\n", | |
4527 | clp->cl_clientid.cl_id); | |
4528 | continue; | |
4529 | } | |
4530 | list_add(&clp->cl_lru, &reaplist); | |
4531 | } | |
4532 | spin_unlock(&nn->client_lock); | |
4533 | list_for_each_safe(pos, next, &reaplist) { | |
4534 | clp = list_entry(pos, struct nfs4_client, cl_lru); | |
4535 | dprintk("NFSD: purging unused client (clientid %08x)\n", | |
4536 | clp->cl_clientid.cl_id); | |
4537 | list_del_init(&clp->cl_lru); | |
4538 | expire_client(clp); | |
4539 | } | |
4540 | spin_lock(&state_lock); | |
4541 | list_for_each_safe(pos, next, &nn->del_recall_lru) { | |
4542 | dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); | |
4543 | if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) { | |
4544 | t = dp->dl_time - cutoff; | |
4545 | new_timeo = min(new_timeo, t); | |
4546 | break; | |
4547 | } | |
4548 | WARN_ON(!unhash_delegation_locked(dp)); | |
4549 | list_add(&dp->dl_recall_lru, &reaplist); | |
4550 | } | |
4551 | spin_unlock(&state_lock); | |
4552 | while (!list_empty(&reaplist)) { | |
4553 | dp = list_first_entry(&reaplist, struct nfs4_delegation, | |
4554 | dl_recall_lru); | |
4555 | list_del_init(&dp->dl_recall_lru); | |
4556 | revoke_delegation(dp); | |
4557 | } | |
4558 | ||
4559 | spin_lock(&nn->client_lock); | |
4560 | while (!list_empty(&nn->close_lru)) { | |
4561 | oo = list_first_entry(&nn->close_lru, struct nfs4_openowner, | |
4562 | oo_close_lru); | |
4563 | if (time_after((unsigned long)oo->oo_time, | |
4564 | (unsigned long)cutoff)) { | |
4565 | t = oo->oo_time - cutoff; | |
4566 | new_timeo = min(new_timeo, t); | |
4567 | break; | |
4568 | } | |
4569 | list_del_init(&oo->oo_close_lru); | |
4570 | stp = oo->oo_last_closed_stid; | |
4571 | oo->oo_last_closed_stid = NULL; | |
4572 | spin_unlock(&nn->client_lock); | |
4573 | nfs4_put_stid(&stp->st_stid); | |
4574 | spin_lock(&nn->client_lock); | |
4575 | } | |
4576 | spin_unlock(&nn->client_lock); | |
4577 | ||
4578 | new_timeo = max_t(time_t, new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT); | |
4579 | return new_timeo; | |
4580 | } | |
4581 | ||
4582 | static struct workqueue_struct *laundry_wq; | |
4583 | static void laundromat_main(struct work_struct *); | |
4584 | ||
4585 | static void | |
4586 | laundromat_main(struct work_struct *laundry) | |
4587 | { | |
4588 | time_t t; | |
4589 | struct delayed_work *dwork = to_delayed_work(laundry); | |
4590 | struct nfsd_net *nn = container_of(dwork, struct nfsd_net, | |
4591 | laundromat_work); | |
4592 | ||
4593 | t = nfs4_laundromat(nn); | |
4594 | dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t); | |
4595 | queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ); | |
4596 | } | |
4597 | ||
4598 | static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp) | |
4599 | { | |
4600 | if (!fh_match(&fhp->fh_handle, &stp->sc_file->fi_fhandle)) | |
4601 | return nfserr_bad_stateid; | |
4602 | return nfs_ok; | |
4603 | } | |
4604 | ||
4605 | static inline int | |
4606 | access_permit_read(struct nfs4_ol_stateid *stp) | |
4607 | { | |
4608 | return test_access(NFS4_SHARE_ACCESS_READ, stp) || | |
4609 | test_access(NFS4_SHARE_ACCESS_BOTH, stp) || | |
4610 | test_access(NFS4_SHARE_ACCESS_WRITE, stp); | |
4611 | } | |
4612 | ||
4613 | static inline int | |
4614 | access_permit_write(struct nfs4_ol_stateid *stp) | |
4615 | { | |
4616 | return test_access(NFS4_SHARE_ACCESS_WRITE, stp) || | |
4617 | test_access(NFS4_SHARE_ACCESS_BOTH, stp); | |
4618 | } | |
4619 | ||
4620 | static | |
4621 | __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags) | |
4622 | { | |
4623 | __be32 status = nfserr_openmode; | |
4624 | ||
4625 | /* For lock stateid's, we test the parent open, not the lock: */ | |
4626 | if (stp->st_openstp) | |
4627 | stp = stp->st_openstp; | |
4628 | if ((flags & WR_STATE) && !access_permit_write(stp)) | |
4629 | goto out; | |
4630 | if ((flags & RD_STATE) && !access_permit_read(stp)) | |
4631 | goto out; | |
4632 | status = nfs_ok; | |
4633 | out: | |
4634 | return status; | |
4635 | } | |
4636 | ||
4637 | static inline __be32 | |
4638 | check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags) | |
4639 | { | |
4640 | if (ONE_STATEID(stateid) && (flags & RD_STATE)) | |
4641 | return nfs_ok; | |
4642 | else if (opens_in_grace(net)) { | |
4643 | /* Answer in remaining cases depends on existence of | |
4644 | * conflicting state; so we must wait out the grace period. */ | |
4645 | return nfserr_grace; | |
4646 | } else if (flags & WR_STATE) | |
4647 | return nfs4_share_conflict(current_fh, | |
4648 | NFS4_SHARE_DENY_WRITE); | |
4649 | else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */ | |
4650 | return nfs4_share_conflict(current_fh, | |
4651 | NFS4_SHARE_DENY_READ); | |
4652 | } | |
4653 | ||
4654 | /* | |
4655 | * Allow READ/WRITE during grace period on recovered state only for files | |
4656 | * that are not able to provide mandatory locking. | |
4657 | */ | |
4658 | static inline int | |
4659 | grace_disallows_io(struct net *net, struct inode *inode) | |
4660 | { | |
4661 | return opens_in_grace(net) && mandatory_lock(inode); | |
4662 | } | |
4663 | ||
4664 | static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session) | |
4665 | { | |
4666 | /* | |
4667 | * When sessions are used the stateid generation number is ignored | |
4668 | * when it is zero. | |
4669 | */ | |
4670 | if (has_session && in->si_generation == 0) | |
4671 | return nfs_ok; | |
4672 | ||
4673 | if (in->si_generation == ref->si_generation) | |
4674 | return nfs_ok; | |
4675 | ||
4676 | /* If the client sends us a stateid from the future, it's buggy: */ | |
4677 | if (nfsd4_stateid_generation_after(in, ref)) | |
4678 | return nfserr_bad_stateid; | |
4679 | /* | |
4680 | * However, we could see a stateid from the past, even from a | |
4681 | * non-buggy client. For example, if the client sends a lock | |
4682 | * while some IO is outstanding, the lock may bump si_generation | |
4683 | * while the IO is still in flight. The client could avoid that | |
4684 | * situation by waiting for responses on all the IO requests, | |
4685 | * but better performance may result in retrying IO that | |
4686 | * receives an old_stateid error if requests are rarely | |
4687 | * reordered in flight: | |
4688 | */ | |
4689 | return nfserr_old_stateid; | |
4690 | } | |
4691 | ||
4692 | static __be32 nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid *ols) | |
4693 | { | |
4694 | if (ols->st_stateowner->so_is_open_owner && | |
4695 | !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED)) | |
4696 | return nfserr_bad_stateid; | |
4697 | return nfs_ok; | |
4698 | } | |
4699 | ||
4700 | static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid) | |
4701 | { | |
4702 | struct nfs4_stid *s; | |
4703 | __be32 status = nfserr_bad_stateid; | |
4704 | ||
4705 | if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) | |
4706 | return status; | |
4707 | /* Client debugging aid. */ | |
4708 | if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) { | |
4709 | char addr_str[INET6_ADDRSTRLEN]; | |
4710 | rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str, | |
4711 | sizeof(addr_str)); | |
4712 | pr_warn_ratelimited("NFSD: client %s testing state ID " | |
4713 | "with incorrect client ID\n", addr_str); | |
4714 | return status; | |
4715 | } | |
4716 | spin_lock(&cl->cl_lock); | |
4717 | s = find_stateid_locked(cl, stateid); | |
4718 | if (!s) | |
4719 | goto out_unlock; | |
4720 | status = check_stateid_generation(stateid, &s->sc_stateid, 1); | |
4721 | if (status) | |
4722 | goto out_unlock; | |
4723 | switch (s->sc_type) { | |
4724 | case NFS4_DELEG_STID: | |
4725 | status = nfs_ok; | |
4726 | break; | |
4727 | case NFS4_REVOKED_DELEG_STID: | |
4728 | status = nfserr_deleg_revoked; | |
4729 | break; | |
4730 | case NFS4_OPEN_STID: | |
4731 | case NFS4_LOCK_STID: | |
4732 | status = nfsd4_check_openowner_confirmed(openlockstateid(s)); | |
4733 | break; | |
4734 | default: | |
4735 | printk("unknown stateid type %x\n", s->sc_type); | |
4736 | /* Fallthrough */ | |
4737 | case NFS4_CLOSED_STID: | |
4738 | case NFS4_CLOSED_DELEG_STID: | |
4739 | status = nfserr_bad_stateid; | |
4740 | } | |
4741 | out_unlock: | |
4742 | spin_unlock(&cl->cl_lock); | |
4743 | return status; | |
4744 | } | |
4745 | ||
4746 | __be32 | |
4747 | nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate, | |
4748 | stateid_t *stateid, unsigned char typemask, | |
4749 | struct nfs4_stid **s, struct nfsd_net *nn) | |
4750 | { | |
4751 | __be32 status; | |
4752 | ||
4753 | if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) | |
4754 | return nfserr_bad_stateid; | |
4755 | status = lookup_clientid(&stateid->si_opaque.so_clid, cstate, nn); | |
4756 | if (status == nfserr_stale_clientid) { | |
4757 | if (cstate->session) | |
4758 | return nfserr_bad_stateid; | |
4759 | return nfserr_stale_stateid; | |
4760 | } | |
4761 | if (status) | |
4762 | return status; | |
4763 | *s = find_stateid_by_type(cstate->clp, stateid, typemask); | |
4764 | if (!*s) | |
4765 | return nfserr_bad_stateid; | |
4766 | return nfs_ok; | |
4767 | } | |
4768 | ||
4769 | static struct file * | |
4770 | nfs4_find_file(struct nfs4_stid *s, int flags) | |
4771 | { | |
4772 | if (!s) | |
4773 | return NULL; | |
4774 | ||
4775 | switch (s->sc_type) { | |
4776 | case NFS4_DELEG_STID: | |
4777 | if (WARN_ON_ONCE(!s->sc_file->fi_deleg_file)) | |
4778 | return NULL; | |
4779 | return get_file(s->sc_file->fi_deleg_file); | |
4780 | case NFS4_OPEN_STID: | |
4781 | case NFS4_LOCK_STID: | |
4782 | if (flags & RD_STATE) | |
4783 | return find_readable_file(s->sc_file); | |
4784 | else | |
4785 | return find_writeable_file(s->sc_file); | |
4786 | break; | |
4787 | } | |
4788 | ||
4789 | return NULL; | |
4790 | } | |
4791 | ||
4792 | static __be32 | |
4793 | nfs4_check_olstateid(struct svc_fh *fhp, struct nfs4_ol_stateid *ols, int flags) | |
4794 | { | |
4795 | __be32 status; | |
4796 | ||
4797 | status = nfsd4_check_openowner_confirmed(ols); | |
4798 | if (status) | |
4799 | return status; | |
4800 | return nfs4_check_openmode(ols, flags); | |
4801 | } | |
4802 | ||
4803 | static __be32 | |
4804 | nfs4_check_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfs4_stid *s, | |
4805 | struct file **filpp, bool *tmp_file, int flags) | |
4806 | { | |
4807 | int acc = (flags & RD_STATE) ? NFSD_MAY_READ : NFSD_MAY_WRITE; | |
4808 | struct file *file; | |
4809 | __be32 status; | |
4810 | ||
4811 | file = nfs4_find_file(s, flags); | |
4812 | if (file) { | |
4813 | status = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, | |
4814 | acc | NFSD_MAY_OWNER_OVERRIDE); | |
4815 | if (status) { | |
4816 | fput(file); | |
4817 | return status; | |
4818 | } | |
4819 | ||
4820 | *filpp = file; | |
4821 | } else { | |
4822 | status = nfsd_open(rqstp, fhp, S_IFREG, acc, filpp); | |
4823 | if (status) | |
4824 | return status; | |
4825 | ||
4826 | if (tmp_file) | |
4827 | *tmp_file = true; | |
4828 | } | |
4829 | ||
4830 | return 0; | |
4831 | } | |
4832 | ||
4833 | /* | |
4834 | * Checks for stateid operations | |
4835 | */ | |
4836 | __be32 | |
4837 | nfs4_preprocess_stateid_op(struct svc_rqst *rqstp, | |
4838 | struct nfsd4_compound_state *cstate, struct svc_fh *fhp, | |
4839 | stateid_t *stateid, int flags, struct file **filpp, bool *tmp_file) | |
4840 | { | |
4841 | struct inode *ino = d_inode(fhp->fh_dentry); | |
4842 | struct net *net = SVC_NET(rqstp); | |
4843 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
4844 | struct nfs4_stid *s = NULL; | |
4845 | __be32 status; | |
4846 | ||
4847 | if (filpp) | |
4848 | *filpp = NULL; | |
4849 | if (tmp_file) | |
4850 | *tmp_file = false; | |
4851 | ||
4852 | if (grace_disallows_io(net, ino)) | |
4853 | return nfserr_grace; | |
4854 | ||
4855 | if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) { | |
4856 | status = check_special_stateids(net, fhp, stateid, flags); | |
4857 | goto done; | |
4858 | } | |
4859 | ||
4860 | status = nfsd4_lookup_stateid(cstate, stateid, | |
4861 | NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID, | |
4862 | &s, nn); | |
4863 | if (status) | |
4864 | return status; | |
4865 | status = check_stateid_generation(stateid, &s->sc_stateid, | |
4866 | nfsd4_has_session(cstate)); | |
4867 | if (status) | |
4868 | goto out; | |
4869 | ||
4870 | switch (s->sc_type) { | |
4871 | case NFS4_DELEG_STID: | |
4872 | status = nfs4_check_delegmode(delegstateid(s), flags); | |
4873 | break; | |
4874 | case NFS4_OPEN_STID: | |
4875 | case NFS4_LOCK_STID: | |
4876 | status = nfs4_check_olstateid(fhp, openlockstateid(s), flags); | |
4877 | break; | |
4878 | default: | |
4879 | status = nfserr_bad_stateid; | |
4880 | break; | |
4881 | } | |
4882 | if (status) | |
4883 | goto out; | |
4884 | status = nfs4_check_fh(fhp, s); | |
4885 | ||
4886 | done: | |
4887 | if (!status && filpp) | |
4888 | status = nfs4_check_file(rqstp, fhp, s, filpp, tmp_file, flags); | |
4889 | out: | |
4890 | if (s) | |
4891 | nfs4_put_stid(s); | |
4892 | return status; | |
4893 | } | |
4894 | ||
4895 | /* | |
4896 | * Test if the stateid is valid | |
4897 | */ | |
4898 | __be32 | |
4899 | nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, | |
4900 | struct nfsd4_test_stateid *test_stateid) | |
4901 | { | |
4902 | struct nfsd4_test_stateid_id *stateid; | |
4903 | struct nfs4_client *cl = cstate->session->se_client; | |
4904 | ||
4905 | list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list) | |
4906 | stateid->ts_id_status = | |
4907 | nfsd4_validate_stateid(cl, &stateid->ts_id_stateid); | |
4908 | ||
4909 | return nfs_ok; | |
4910 | } | |
4911 | ||
4912 | __be32 | |
4913 | nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, | |
4914 | struct nfsd4_free_stateid *free_stateid) | |
4915 | { | |
4916 | stateid_t *stateid = &free_stateid->fr_stateid; | |
4917 | struct nfs4_stid *s; | |
4918 | struct nfs4_delegation *dp; | |
4919 | struct nfs4_ol_stateid *stp; | |
4920 | struct nfs4_client *cl = cstate->session->se_client; | |
4921 | __be32 ret = nfserr_bad_stateid; | |
4922 | ||
4923 | spin_lock(&cl->cl_lock); | |
4924 | s = find_stateid_locked(cl, stateid); | |
4925 | if (!s) | |
4926 | goto out_unlock; | |
4927 | switch (s->sc_type) { | |
4928 | case NFS4_DELEG_STID: | |
4929 | ret = nfserr_locks_held; | |
4930 | break; | |
4931 | case NFS4_OPEN_STID: | |
4932 | ret = check_stateid_generation(stateid, &s->sc_stateid, 1); | |
4933 | if (ret) | |
4934 | break; | |
4935 | ret = nfserr_locks_held; | |
4936 | break; | |
4937 | case NFS4_LOCK_STID: | |
4938 | ret = check_stateid_generation(stateid, &s->sc_stateid, 1); | |
4939 | if (ret) | |
4940 | break; | |
4941 | stp = openlockstateid(s); | |
4942 | ret = nfserr_locks_held; | |
4943 | if (check_for_locks(stp->st_stid.sc_file, | |
4944 | lockowner(stp->st_stateowner))) | |
4945 | break; | |
4946 | WARN_ON(!unhash_lock_stateid(stp)); | |
4947 | spin_unlock(&cl->cl_lock); | |
4948 | nfs4_put_stid(s); | |
4949 | ret = nfs_ok; | |
4950 | goto out; | |
4951 | case NFS4_REVOKED_DELEG_STID: | |
4952 | dp = delegstateid(s); | |
4953 | list_del_init(&dp->dl_recall_lru); | |
4954 | spin_unlock(&cl->cl_lock); | |
4955 | nfs4_put_stid(s); | |
4956 | ret = nfs_ok; | |
4957 | goto out; | |
4958 | /* Default falls through and returns nfserr_bad_stateid */ | |
4959 | } | |
4960 | out_unlock: | |
4961 | spin_unlock(&cl->cl_lock); | |
4962 | out: | |
4963 | return ret; | |
4964 | } | |
4965 | ||
4966 | static inline int | |
4967 | setlkflg (int type) | |
4968 | { | |
4969 | return (type == NFS4_READW_LT || type == NFS4_READ_LT) ? | |
4970 | RD_STATE : WR_STATE; | |
4971 | } | |
4972 | ||
4973 | static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp) | |
4974 | { | |
4975 | struct svc_fh *current_fh = &cstate->current_fh; | |
4976 | struct nfs4_stateowner *sop = stp->st_stateowner; | |
4977 | __be32 status; | |
4978 | ||
4979 | status = nfsd4_check_seqid(cstate, sop, seqid); | |
4980 | if (status) | |
4981 | return status; | |
4982 | if (stp->st_stid.sc_type == NFS4_CLOSED_STID | |
4983 | || stp->st_stid.sc_type == NFS4_REVOKED_DELEG_STID) | |
4984 | /* | |
4985 | * "Closed" stateid's exist *only* to return | |
4986 | * nfserr_replay_me from the previous step, and | |
4987 | * revoked delegations are kept only for free_stateid. | |
4988 | */ | |
4989 | return nfserr_bad_stateid; | |
4990 | mutex_lock(&stp->st_mutex); | |
4991 | status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate)); | |
4992 | if (status == nfs_ok) | |
4993 | status = nfs4_check_fh(current_fh, &stp->st_stid); | |
4994 | if (status != nfs_ok) | |
4995 | mutex_unlock(&stp->st_mutex); | |
4996 | return status; | |
4997 | } | |
4998 | ||
4999 | /* | |
5000 | * Checks for sequence id mutating operations. | |
5001 | */ | |
5002 | static __be32 | |
5003 | nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid, | |
5004 | stateid_t *stateid, char typemask, | |
5005 | struct nfs4_ol_stateid **stpp, | |
5006 | struct nfsd_net *nn) | |
5007 | { | |
5008 | __be32 status; | |
5009 | struct nfs4_stid *s; | |
5010 | struct nfs4_ol_stateid *stp = NULL; | |
5011 | ||
5012 | dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__, | |
5013 | seqid, STATEID_VAL(stateid)); | |
5014 | ||
5015 | *stpp = NULL; | |
5016 | status = nfsd4_lookup_stateid(cstate, stateid, typemask, &s, nn); | |
5017 | if (status) | |
5018 | return status; | |
5019 | stp = openlockstateid(s); | |
5020 | nfsd4_cstate_assign_replay(cstate, stp->st_stateowner); | |
5021 | ||
5022 | status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp); | |
5023 | if (!status) | |
5024 | *stpp = stp; | |
5025 | else | |
5026 | nfs4_put_stid(&stp->st_stid); | |
5027 | return status; | |
5028 | } | |
5029 | ||
5030 | static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid, | |
5031 | stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn) | |
5032 | { | |
5033 | __be32 status; | |
5034 | struct nfs4_openowner *oo; | |
5035 | struct nfs4_ol_stateid *stp; | |
5036 | ||
5037 | status = nfs4_preprocess_seqid_op(cstate, seqid, stateid, | |
5038 | NFS4_OPEN_STID, &stp, nn); | |
5039 | if (status) | |
5040 | return status; | |
5041 | oo = openowner(stp->st_stateowner); | |
5042 | if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) { | |
5043 | mutex_unlock(&stp->st_mutex); | |
5044 | nfs4_put_stid(&stp->st_stid); | |
5045 | return nfserr_bad_stateid; | |
5046 | } | |
5047 | *stpp = stp; | |
5048 | return nfs_ok; | |
5049 | } | |
5050 | ||
5051 | __be32 | |
5052 | nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, | |
5053 | struct nfsd4_open_confirm *oc) | |
5054 | { | |
5055 | __be32 status; | |
5056 | struct nfs4_openowner *oo; | |
5057 | struct nfs4_ol_stateid *stp; | |
5058 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
5059 | ||
5060 | dprintk("NFSD: nfsd4_open_confirm on file %pd\n", | |
5061 | cstate->current_fh.fh_dentry); | |
5062 | ||
5063 | status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0); | |
5064 | if (status) | |
5065 | return status; | |
5066 | ||
5067 | status = nfs4_preprocess_seqid_op(cstate, | |
5068 | oc->oc_seqid, &oc->oc_req_stateid, | |
5069 | NFS4_OPEN_STID, &stp, nn); | |
5070 | if (status) | |
5071 | goto out; | |
5072 | oo = openowner(stp->st_stateowner); | |
5073 | status = nfserr_bad_stateid; | |
5074 | if (oo->oo_flags & NFS4_OO_CONFIRMED) { | |
5075 | mutex_unlock(&stp->st_mutex); | |
5076 | goto put_stateid; | |
5077 | } | |
5078 | oo->oo_flags |= NFS4_OO_CONFIRMED; | |
5079 | nfs4_inc_and_copy_stateid(&oc->oc_resp_stateid, &stp->st_stid); | |
5080 | mutex_unlock(&stp->st_mutex); | |
5081 | dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n", | |
5082 | __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid)); | |
5083 | ||
5084 | nfsd4_client_record_create(oo->oo_owner.so_client); | |
5085 | status = nfs_ok; | |
5086 | put_stateid: | |
5087 | nfs4_put_stid(&stp->st_stid); | |
5088 | out: | |
5089 | nfsd4_bump_seqid(cstate, status); | |
5090 | return status; | |
5091 | } | |
5092 | ||
5093 | static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access) | |
5094 | { | |
5095 | if (!test_access(access, stp)) | |
5096 | return; | |
5097 | nfs4_file_put_access(stp->st_stid.sc_file, access); | |
5098 | clear_access(access, stp); | |
5099 | } | |
5100 | ||
5101 | static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access) | |
5102 | { | |
5103 | switch (to_access) { | |
5104 | case NFS4_SHARE_ACCESS_READ: | |
5105 | nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE); | |
5106 | nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH); | |
5107 | break; | |
5108 | case NFS4_SHARE_ACCESS_WRITE: | |
5109 | nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ); | |
5110 | nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH); | |
5111 | break; | |
5112 | case NFS4_SHARE_ACCESS_BOTH: | |
5113 | break; | |
5114 | default: | |
5115 | WARN_ON_ONCE(1); | |
5116 | } | |
5117 | } | |
5118 | ||
5119 | __be32 | |
5120 | nfsd4_open_downgrade(struct svc_rqst *rqstp, | |
5121 | struct nfsd4_compound_state *cstate, | |
5122 | struct nfsd4_open_downgrade *od) | |
5123 | { | |
5124 | __be32 status; | |
5125 | struct nfs4_ol_stateid *stp; | |
5126 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
5127 | ||
5128 | dprintk("NFSD: nfsd4_open_downgrade on file %pd\n", | |
5129 | cstate->current_fh.fh_dentry); | |
5130 | ||
5131 | /* We don't yet support WANT bits: */ | |
5132 | if (od->od_deleg_want) | |
5133 | dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__, | |
5134 | od->od_deleg_want); | |
5135 | ||
5136 | status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid, | |
5137 | &od->od_stateid, &stp, nn); | |
5138 | if (status) | |
5139 | goto out; | |
5140 | status = nfserr_inval; | |
5141 | if (!test_access(od->od_share_access, stp)) { | |
5142 | dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n", | |
5143 | stp->st_access_bmap, od->od_share_access); | |
5144 | goto put_stateid; | |
5145 | } | |
5146 | if (!test_deny(od->od_share_deny, stp)) { | |
5147 | dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n", | |
5148 | stp->st_deny_bmap, od->od_share_deny); | |
5149 | goto put_stateid; | |
5150 | } | |
5151 | nfs4_stateid_downgrade(stp, od->od_share_access); | |
5152 | reset_union_bmap_deny(od->od_share_deny, stp); | |
5153 | nfs4_inc_and_copy_stateid(&od->od_stateid, &stp->st_stid); | |
5154 | status = nfs_ok; | |
5155 | put_stateid: | |
5156 | mutex_unlock(&stp->st_mutex); | |
5157 | nfs4_put_stid(&stp->st_stid); | |
5158 | out: | |
5159 | nfsd4_bump_seqid(cstate, status); | |
5160 | return status; | |
5161 | } | |
5162 | ||
5163 | static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s) | |
5164 | { | |
5165 | struct nfs4_client *clp = s->st_stid.sc_client; | |
5166 | bool unhashed; | |
5167 | LIST_HEAD(reaplist); | |
5168 | ||
5169 | s->st_stid.sc_type = NFS4_CLOSED_STID; | |
5170 | spin_lock(&clp->cl_lock); | |
5171 | unhashed = unhash_open_stateid(s, &reaplist); | |
5172 | ||
5173 | if (clp->cl_minorversion) { | |
5174 | if (unhashed) | |
5175 | put_ol_stateid_locked(s, &reaplist); | |
5176 | spin_unlock(&clp->cl_lock); | |
5177 | free_ol_stateid_reaplist(&reaplist); | |
5178 | } else { | |
5179 | spin_unlock(&clp->cl_lock); | |
5180 | free_ol_stateid_reaplist(&reaplist); | |
5181 | if (unhashed) | |
5182 | move_to_close_lru(s, clp->net); | |
5183 | } | |
5184 | } | |
5185 | ||
5186 | /* | |
5187 | * nfs4_unlock_state() called after encode | |
5188 | */ | |
5189 | __be32 | |
5190 | nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, | |
5191 | struct nfsd4_close *close) | |
5192 | { | |
5193 | __be32 status; | |
5194 | struct nfs4_ol_stateid *stp; | |
5195 | struct net *net = SVC_NET(rqstp); | |
5196 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
5197 | ||
5198 | dprintk("NFSD: nfsd4_close on file %pd\n", | |
5199 | cstate->current_fh.fh_dentry); | |
5200 | ||
5201 | status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid, | |
5202 | &close->cl_stateid, | |
5203 | NFS4_OPEN_STID|NFS4_CLOSED_STID, | |
5204 | &stp, nn); | |
5205 | nfsd4_bump_seqid(cstate, status); | |
5206 | if (status) | |
5207 | goto out; | |
5208 | nfs4_inc_and_copy_stateid(&close->cl_stateid, &stp->st_stid); | |
5209 | mutex_unlock(&stp->st_mutex); | |
5210 | ||
5211 | nfsd4_close_open_stateid(stp); | |
5212 | ||
5213 | /* put reference from nfs4_preprocess_seqid_op */ | |
5214 | nfs4_put_stid(&stp->st_stid); | |
5215 | out: | |
5216 | return status; | |
5217 | } | |
5218 | ||
5219 | __be32 | |
5220 | nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, | |
5221 | struct nfsd4_delegreturn *dr) | |
5222 | { | |
5223 | struct nfs4_delegation *dp; | |
5224 | stateid_t *stateid = &dr->dr_stateid; | |
5225 | struct nfs4_stid *s; | |
5226 | __be32 status; | |
5227 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
5228 | ||
5229 | if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) | |
5230 | return status; | |
5231 | ||
5232 | status = nfsd4_lookup_stateid(cstate, stateid, NFS4_DELEG_STID, &s, nn); | |
5233 | if (status) | |
5234 | goto out; | |
5235 | dp = delegstateid(s); | |
5236 | status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate)); | |
5237 | if (status) | |
5238 | goto put_stateid; | |
5239 | ||
5240 | destroy_delegation(dp); | |
5241 | put_stateid: | |
5242 | nfs4_put_stid(&dp->dl_stid); | |
5243 | out: | |
5244 | return status; | |
5245 | } | |
5246 | ||
5247 | static inline u64 | |
5248 | end_offset(u64 start, u64 len) | |
5249 | { | |
5250 | u64 end; | |
5251 | ||
5252 | end = start + len; | |
5253 | return end >= start ? end: NFS4_MAX_UINT64; | |
5254 | } | |
5255 | ||
5256 | /* last octet in a range */ | |
5257 | static inline u64 | |
5258 | last_byte_offset(u64 start, u64 len) | |
5259 | { | |
5260 | u64 end; | |
5261 | ||
5262 | WARN_ON_ONCE(!len); | |
5263 | end = start + len; | |
5264 | return end > start ? end - 1: NFS4_MAX_UINT64; | |
5265 | } | |
5266 | ||
5267 | /* | |
5268 | * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that | |
5269 | * we can't properly handle lock requests that go beyond the (2^63 - 1)-th | |
5270 | * byte, because of sign extension problems. Since NFSv4 calls for 64-bit | |
5271 | * locking, this prevents us from being completely protocol-compliant. The | |
5272 | * real solution to this problem is to start using unsigned file offsets in | |
5273 | * the VFS, but this is a very deep change! | |
5274 | */ | |
5275 | static inline void | |
5276 | nfs4_transform_lock_offset(struct file_lock *lock) | |
5277 | { | |
5278 | if (lock->fl_start < 0) | |
5279 | lock->fl_start = OFFSET_MAX; | |
5280 | if (lock->fl_end < 0) | |
5281 | lock->fl_end = OFFSET_MAX; | |
5282 | } | |
5283 | ||
5284 | static fl_owner_t | |
5285 | nfsd4_fl_get_owner(fl_owner_t owner) | |
5286 | { | |
5287 | struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner; | |
5288 | ||
5289 | nfs4_get_stateowner(&lo->lo_owner); | |
5290 | return owner; | |
5291 | } | |
5292 | ||
5293 | static void | |
5294 | nfsd4_fl_put_owner(fl_owner_t owner) | |
5295 | { | |
5296 | struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner; | |
5297 | ||
5298 | if (lo) | |
5299 | nfs4_put_stateowner(&lo->lo_owner); | |
5300 | } | |
5301 | ||
5302 | static const struct lock_manager_operations nfsd_posix_mng_ops = { | |
5303 | .lm_get_owner = nfsd4_fl_get_owner, | |
5304 | .lm_put_owner = nfsd4_fl_put_owner, | |
5305 | }; | |
5306 | ||
5307 | static inline void | |
5308 | nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny) | |
5309 | { | |
5310 | struct nfs4_lockowner *lo; | |
5311 | ||
5312 | if (fl->fl_lmops == &nfsd_posix_mng_ops) { | |
5313 | lo = (struct nfs4_lockowner *) fl->fl_owner; | |
5314 | deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data, | |
5315 | lo->lo_owner.so_owner.len, GFP_KERNEL); | |
5316 | if (!deny->ld_owner.data) | |
5317 | /* We just don't care that much */ | |
5318 | goto nevermind; | |
5319 | deny->ld_owner.len = lo->lo_owner.so_owner.len; | |
5320 | deny->ld_clientid = lo->lo_owner.so_client->cl_clientid; | |
5321 | } else { | |
5322 | nevermind: | |
5323 | deny->ld_owner.len = 0; | |
5324 | deny->ld_owner.data = NULL; | |
5325 | deny->ld_clientid.cl_boot = 0; | |
5326 | deny->ld_clientid.cl_id = 0; | |
5327 | } | |
5328 | deny->ld_start = fl->fl_start; | |
5329 | deny->ld_length = NFS4_MAX_UINT64; | |
5330 | if (fl->fl_end != NFS4_MAX_UINT64) | |
5331 | deny->ld_length = fl->fl_end - fl->fl_start + 1; | |
5332 | deny->ld_type = NFS4_READ_LT; | |
5333 | if (fl->fl_type != F_RDLCK) | |
5334 | deny->ld_type = NFS4_WRITE_LT; | |
5335 | } | |
5336 | ||
5337 | static struct nfs4_lockowner * | |
5338 | find_lockowner_str_locked(struct nfs4_client *clp, struct xdr_netobj *owner) | |
5339 | { | |
5340 | unsigned int strhashval = ownerstr_hashval(owner); | |
5341 | struct nfs4_stateowner *so; | |
5342 | ||
5343 | lockdep_assert_held(&clp->cl_lock); | |
5344 | ||
5345 | list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval], | |
5346 | so_strhash) { | |
5347 | if (so->so_is_open_owner) | |
5348 | continue; | |
5349 | if (same_owner_str(so, owner)) | |
5350 | return lockowner(nfs4_get_stateowner(so)); | |
5351 | } | |
5352 | return NULL; | |
5353 | } | |
5354 | ||
5355 | static struct nfs4_lockowner * | |
5356 | find_lockowner_str(struct nfs4_client *clp, struct xdr_netobj *owner) | |
5357 | { | |
5358 | struct nfs4_lockowner *lo; | |
5359 | ||
5360 | spin_lock(&clp->cl_lock); | |
5361 | lo = find_lockowner_str_locked(clp, owner); | |
5362 | spin_unlock(&clp->cl_lock); | |
5363 | return lo; | |
5364 | } | |
5365 | ||
5366 | static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop) | |
5367 | { | |
5368 | unhash_lockowner_locked(lockowner(sop)); | |
5369 | } | |
5370 | ||
5371 | static void nfs4_free_lockowner(struct nfs4_stateowner *sop) | |
5372 | { | |
5373 | struct nfs4_lockowner *lo = lockowner(sop); | |
5374 | ||
5375 | kmem_cache_free(lockowner_slab, lo); | |
5376 | } | |
5377 | ||
5378 | static const struct nfs4_stateowner_operations lockowner_ops = { | |
5379 | .so_unhash = nfs4_unhash_lockowner, | |
5380 | .so_free = nfs4_free_lockowner, | |
5381 | }; | |
5382 | ||
5383 | /* | |
5384 | * Alloc a lock owner structure. | |
5385 | * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has | |
5386 | * occurred. | |
5387 | * | |
5388 | * strhashval = ownerstr_hashval | |
5389 | */ | |
5390 | static struct nfs4_lockowner * | |
5391 | alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, | |
5392 | struct nfs4_ol_stateid *open_stp, | |
5393 | struct nfsd4_lock *lock) | |
5394 | { | |
5395 | struct nfs4_lockowner *lo, *ret; | |
5396 | ||
5397 | lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp); | |
5398 | if (!lo) | |
5399 | return NULL; | |
5400 | INIT_LIST_HEAD(&lo->lo_owner.so_stateids); | |
5401 | lo->lo_owner.so_is_open_owner = 0; | |
5402 | lo->lo_owner.so_seqid = lock->lk_new_lock_seqid; | |
5403 | lo->lo_owner.so_ops = &lockowner_ops; | |
5404 | spin_lock(&clp->cl_lock); | |
5405 | ret = find_lockowner_str_locked(clp, &lock->lk_new_owner); | |
5406 | if (ret == NULL) { | |
5407 | list_add(&lo->lo_owner.so_strhash, | |
5408 | &clp->cl_ownerstr_hashtbl[strhashval]); | |
5409 | ret = lo; | |
5410 | } else | |
5411 | nfs4_free_stateowner(&lo->lo_owner); | |
5412 | ||
5413 | spin_unlock(&clp->cl_lock); | |
5414 | return ret; | |
5415 | } | |
5416 | ||
5417 | static void | |
5418 | init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo, | |
5419 | struct nfs4_file *fp, struct inode *inode, | |
5420 | struct nfs4_ol_stateid *open_stp) | |
5421 | { | |
5422 | struct nfs4_client *clp = lo->lo_owner.so_client; | |
5423 | ||
5424 | lockdep_assert_held(&clp->cl_lock); | |
5425 | ||
5426 | atomic_inc(&stp->st_stid.sc_count); | |
5427 | stp->st_stid.sc_type = NFS4_LOCK_STID; | |
5428 | stp->st_stateowner = nfs4_get_stateowner(&lo->lo_owner); | |
5429 | get_nfs4_file(fp); | |
5430 | stp->st_stid.sc_file = fp; | |
5431 | stp->st_stid.sc_free = nfs4_free_lock_stateid; | |
5432 | stp->st_access_bmap = 0; | |
5433 | stp->st_deny_bmap = open_stp->st_deny_bmap; | |
5434 | stp->st_openstp = open_stp; | |
5435 | mutex_init(&stp->st_mutex); | |
5436 | list_add(&stp->st_locks, &open_stp->st_locks); | |
5437 | list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids); | |
5438 | spin_lock(&fp->fi_lock); | |
5439 | list_add(&stp->st_perfile, &fp->fi_stateids); | |
5440 | spin_unlock(&fp->fi_lock); | |
5441 | } | |
5442 | ||
5443 | static struct nfs4_ol_stateid * | |
5444 | find_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp) | |
5445 | { | |
5446 | struct nfs4_ol_stateid *lst; | |
5447 | struct nfs4_client *clp = lo->lo_owner.so_client; | |
5448 | ||
5449 | lockdep_assert_held(&clp->cl_lock); | |
5450 | ||
5451 | list_for_each_entry(lst, &lo->lo_owner.so_stateids, st_perstateowner) { | |
5452 | if (lst->st_stid.sc_file == fp) { | |
5453 | atomic_inc(&lst->st_stid.sc_count); | |
5454 | return lst; | |
5455 | } | |
5456 | } | |
5457 | return NULL; | |
5458 | } | |
5459 | ||
5460 | static struct nfs4_ol_stateid * | |
5461 | find_or_create_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fi, | |
5462 | struct inode *inode, struct nfs4_ol_stateid *ost, | |
5463 | bool *new) | |
5464 | { | |
5465 | struct nfs4_stid *ns = NULL; | |
5466 | struct nfs4_ol_stateid *lst; | |
5467 | struct nfs4_openowner *oo = openowner(ost->st_stateowner); | |
5468 | struct nfs4_client *clp = oo->oo_owner.so_client; | |
5469 | ||
5470 | spin_lock(&clp->cl_lock); | |
5471 | lst = find_lock_stateid(lo, fi); | |
5472 | if (lst == NULL) { | |
5473 | spin_unlock(&clp->cl_lock); | |
5474 | ns = nfs4_alloc_stid(clp, stateid_slab); | |
5475 | if (ns == NULL) | |
5476 | return NULL; | |
5477 | ||
5478 | spin_lock(&clp->cl_lock); | |
5479 | lst = find_lock_stateid(lo, fi); | |
5480 | if (likely(!lst)) { | |
5481 | lst = openlockstateid(ns); | |
5482 | init_lock_stateid(lst, lo, fi, inode, ost); | |
5483 | ns = NULL; | |
5484 | *new = true; | |
5485 | } | |
5486 | } | |
5487 | spin_unlock(&clp->cl_lock); | |
5488 | if (ns) | |
5489 | nfs4_put_stid(ns); | |
5490 | return lst; | |
5491 | } | |
5492 | ||
5493 | static int | |
5494 | check_lock_length(u64 offset, u64 length) | |
5495 | { | |
5496 | return ((length == 0) || ((length != NFS4_MAX_UINT64) && | |
5497 | (length > ~offset))); | |
5498 | } | |
5499 | ||
5500 | static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access) | |
5501 | { | |
5502 | struct nfs4_file *fp = lock_stp->st_stid.sc_file; | |
5503 | ||
5504 | lockdep_assert_held(&fp->fi_lock); | |
5505 | ||
5506 | if (test_access(access, lock_stp)) | |
5507 | return; | |
5508 | __nfs4_file_get_access(fp, access); | |
5509 | set_access(access, lock_stp); | |
5510 | } | |
5511 | ||
5512 | static __be32 | |
5513 | lookup_or_create_lock_state(struct nfsd4_compound_state *cstate, | |
5514 | struct nfs4_ol_stateid *ost, | |
5515 | struct nfsd4_lock *lock, | |
5516 | struct nfs4_ol_stateid **lst, bool *new) | |
5517 | { | |
5518 | __be32 status; | |
5519 | struct nfs4_file *fi = ost->st_stid.sc_file; | |
5520 | struct nfs4_openowner *oo = openowner(ost->st_stateowner); | |
5521 | struct nfs4_client *cl = oo->oo_owner.so_client; | |
5522 | struct inode *inode = d_inode(cstate->current_fh.fh_dentry); | |
5523 | struct nfs4_lockowner *lo; | |
5524 | unsigned int strhashval; | |
5525 | ||
5526 | lo = find_lockowner_str(cl, &lock->lk_new_owner); | |
5527 | if (!lo) { | |
5528 | strhashval = ownerstr_hashval(&lock->lk_new_owner); | |
5529 | lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock); | |
5530 | if (lo == NULL) | |
5531 | return nfserr_jukebox; | |
5532 | } else { | |
5533 | /* with an existing lockowner, seqids must be the same */ | |
5534 | status = nfserr_bad_seqid; | |
5535 | if (!cstate->minorversion && | |
5536 | lock->lk_new_lock_seqid != lo->lo_owner.so_seqid) | |
5537 | goto out; | |
5538 | } | |
5539 | ||
5540 | *lst = find_or_create_lock_stateid(lo, fi, inode, ost, new); | |
5541 | if (*lst == NULL) { | |
5542 | status = nfserr_jukebox; | |
5543 | goto out; | |
5544 | } | |
5545 | status = nfs_ok; | |
5546 | out: | |
5547 | nfs4_put_stateowner(&lo->lo_owner); | |
5548 | return status; | |
5549 | } | |
5550 | ||
5551 | /* | |
5552 | * LOCK operation | |
5553 | */ | |
5554 | __be32 | |
5555 | nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, | |
5556 | struct nfsd4_lock *lock) | |
5557 | { | |
5558 | struct nfs4_openowner *open_sop = NULL; | |
5559 | struct nfs4_lockowner *lock_sop = NULL; | |
5560 | struct nfs4_ol_stateid *lock_stp = NULL; | |
5561 | struct nfs4_ol_stateid *open_stp = NULL; | |
5562 | struct nfs4_file *fp; | |
5563 | struct file *filp = NULL; | |
5564 | struct file_lock *file_lock = NULL; | |
5565 | struct file_lock *conflock = NULL; | |
5566 | __be32 status = 0; | |
5567 | int lkflg; | |
5568 | int err; | |
5569 | bool new = false; | |
5570 | struct net *net = SVC_NET(rqstp); | |
5571 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
5572 | ||
5573 | dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n", | |
5574 | (long long) lock->lk_offset, | |
5575 | (long long) lock->lk_length); | |
5576 | ||
5577 | if (check_lock_length(lock->lk_offset, lock->lk_length)) | |
5578 | return nfserr_inval; | |
5579 | ||
5580 | if ((status = fh_verify(rqstp, &cstate->current_fh, | |
5581 | S_IFREG, NFSD_MAY_LOCK))) { | |
5582 | dprintk("NFSD: nfsd4_lock: permission denied!\n"); | |
5583 | return status; | |
5584 | } | |
5585 | ||
5586 | if (lock->lk_is_new) { | |
5587 | if (nfsd4_has_session(cstate)) | |
5588 | /* See rfc 5661 18.10.3: given clientid is ignored: */ | |
5589 | memcpy(&lock->lk_new_clientid, | |
5590 | &cstate->session->se_client->cl_clientid, | |
5591 | sizeof(clientid_t)); | |
5592 | ||
5593 | status = nfserr_stale_clientid; | |
5594 | if (STALE_CLIENTID(&lock->lk_new_clientid, nn)) | |
5595 | goto out; | |
5596 | ||
5597 | /* validate and update open stateid and open seqid */ | |
5598 | status = nfs4_preprocess_confirmed_seqid_op(cstate, | |
5599 | lock->lk_new_open_seqid, | |
5600 | &lock->lk_new_open_stateid, | |
5601 | &open_stp, nn); | |
5602 | if (status) | |
5603 | goto out; | |
5604 | mutex_unlock(&open_stp->st_mutex); | |
5605 | open_sop = openowner(open_stp->st_stateowner); | |
5606 | status = nfserr_bad_stateid; | |
5607 | if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid, | |
5608 | &lock->lk_new_clientid)) | |
5609 | goto out; | |
5610 | status = lookup_or_create_lock_state(cstate, open_stp, lock, | |
5611 | &lock_stp, &new); | |
5612 | if (status == nfs_ok) | |
5613 | mutex_lock(&lock_stp->st_mutex); | |
5614 | } else { | |
5615 | status = nfs4_preprocess_seqid_op(cstate, | |
5616 | lock->lk_old_lock_seqid, | |
5617 | &lock->lk_old_lock_stateid, | |
5618 | NFS4_LOCK_STID, &lock_stp, nn); | |
5619 | } | |
5620 | if (status) | |
5621 | goto out; | |
5622 | lock_sop = lockowner(lock_stp->st_stateowner); | |
5623 | ||
5624 | lkflg = setlkflg(lock->lk_type); | |
5625 | status = nfs4_check_openmode(lock_stp, lkflg); | |
5626 | if (status) | |
5627 | goto out; | |
5628 | ||
5629 | status = nfserr_grace; | |
5630 | if (locks_in_grace(net) && !lock->lk_reclaim) | |
5631 | goto out; | |
5632 | status = nfserr_no_grace; | |
5633 | if (!locks_in_grace(net) && lock->lk_reclaim) | |
5634 | goto out; | |
5635 | ||
5636 | file_lock = locks_alloc_lock(); | |
5637 | if (!file_lock) { | |
5638 | dprintk("NFSD: %s: unable to allocate lock!\n", __func__); | |
5639 | status = nfserr_jukebox; | |
5640 | goto out; | |
5641 | } | |
5642 | ||
5643 | fp = lock_stp->st_stid.sc_file; | |
5644 | switch (lock->lk_type) { | |
5645 | case NFS4_READ_LT: | |
5646 | case NFS4_READW_LT: | |
5647 | spin_lock(&fp->fi_lock); | |
5648 | filp = find_readable_file_locked(fp); | |
5649 | if (filp) | |
5650 | get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ); | |
5651 | spin_unlock(&fp->fi_lock); | |
5652 | file_lock->fl_type = F_RDLCK; | |
5653 | break; | |
5654 | case NFS4_WRITE_LT: | |
5655 | case NFS4_WRITEW_LT: | |
5656 | spin_lock(&fp->fi_lock); | |
5657 | filp = find_writeable_file_locked(fp); | |
5658 | if (filp) | |
5659 | get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE); | |
5660 | spin_unlock(&fp->fi_lock); | |
5661 | file_lock->fl_type = F_WRLCK; | |
5662 | break; | |
5663 | default: | |
5664 | status = nfserr_inval; | |
5665 | goto out; | |
5666 | } | |
5667 | if (!filp) { | |
5668 | status = nfserr_openmode; | |
5669 | goto out; | |
5670 | } | |
5671 | ||
5672 | file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(&lock_sop->lo_owner)); | |
5673 | file_lock->fl_pid = current->tgid; | |
5674 | file_lock->fl_file = filp; | |
5675 | file_lock->fl_flags = FL_POSIX; | |
5676 | file_lock->fl_lmops = &nfsd_posix_mng_ops; | |
5677 | file_lock->fl_start = lock->lk_offset; | |
5678 | file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length); | |
5679 | nfs4_transform_lock_offset(file_lock); | |
5680 | ||
5681 | conflock = locks_alloc_lock(); | |
5682 | if (!conflock) { | |
5683 | dprintk("NFSD: %s: unable to allocate lock!\n", __func__); | |
5684 | status = nfserr_jukebox; | |
5685 | goto out; | |
5686 | } | |
5687 | ||
5688 | err = vfs_lock_file(filp, F_SETLK, file_lock, conflock); | |
5689 | switch (-err) { | |
5690 | case 0: /* success! */ | |
5691 | nfs4_inc_and_copy_stateid(&lock->lk_resp_stateid, &lock_stp->st_stid); | |
5692 | status = 0; | |
5693 | break; | |
5694 | case (EAGAIN): /* conflock holds conflicting lock */ | |
5695 | status = nfserr_denied; | |
5696 | dprintk("NFSD: nfsd4_lock: conflicting lock found!\n"); | |
5697 | nfs4_set_lock_denied(conflock, &lock->lk_denied); | |
5698 | break; | |
5699 | case (EDEADLK): | |
5700 | status = nfserr_deadlock; | |
5701 | break; | |
5702 | default: | |
5703 | dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err); | |
5704 | status = nfserrno(err); | |
5705 | break; | |
5706 | } | |
5707 | out: | |
5708 | if (filp) | |
5709 | fput(filp); | |
5710 | if (lock_stp) { | |
5711 | /* Bump seqid manually if the 4.0 replay owner is openowner */ | |
5712 | if (cstate->replay_owner && | |
5713 | cstate->replay_owner != &lock_sop->lo_owner && | |
5714 | seqid_mutating_err(ntohl(status))) | |
5715 | lock_sop->lo_owner.so_seqid++; | |
5716 | ||
5717 | mutex_unlock(&lock_stp->st_mutex); | |
5718 | ||
5719 | /* | |
5720 | * If this is a new, never-before-used stateid, and we are | |
5721 | * returning an error, then just go ahead and release it. | |
5722 | */ | |
5723 | if (status && new) | |
5724 | release_lock_stateid(lock_stp); | |
5725 | ||
5726 | nfs4_put_stid(&lock_stp->st_stid); | |
5727 | } | |
5728 | if (open_stp) | |
5729 | nfs4_put_stid(&open_stp->st_stid); | |
5730 | nfsd4_bump_seqid(cstate, status); | |
5731 | if (file_lock) | |
5732 | locks_free_lock(file_lock); | |
5733 | if (conflock) | |
5734 | locks_free_lock(conflock); | |
5735 | return status; | |
5736 | } | |
5737 | ||
5738 | /* | |
5739 | * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN, | |
5740 | * so we do a temporary open here just to get an open file to pass to | |
5741 | * vfs_test_lock. (Arguably perhaps test_lock should be done with an | |
5742 | * inode operation.) | |
5743 | */ | |
5744 | static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock) | |
5745 | { | |
5746 | struct file *file; | |
5747 | __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); | |
5748 | if (!err) { | |
5749 | err = nfserrno(vfs_test_lock(file, lock)); | |
5750 | fput(file); | |
5751 | } | |
5752 | return err; | |
5753 | } | |
5754 | ||
5755 | /* | |
5756 | * LOCKT operation | |
5757 | */ | |
5758 | __be32 | |
5759 | nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, | |
5760 | struct nfsd4_lockt *lockt) | |
5761 | { | |
5762 | struct file_lock *file_lock = NULL; | |
5763 | struct nfs4_lockowner *lo = NULL; | |
5764 | __be32 status; | |
5765 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
5766 | ||
5767 | if (locks_in_grace(SVC_NET(rqstp))) | |
5768 | return nfserr_grace; | |
5769 | ||
5770 | if (check_lock_length(lockt->lt_offset, lockt->lt_length)) | |
5771 | return nfserr_inval; | |
5772 | ||
5773 | if (!nfsd4_has_session(cstate)) { | |
5774 | status = lookup_clientid(&lockt->lt_clientid, cstate, nn); | |
5775 | if (status) | |
5776 | goto out; | |
5777 | } | |
5778 | ||
5779 | if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) | |
5780 | goto out; | |
5781 | ||
5782 | file_lock = locks_alloc_lock(); | |
5783 | if (!file_lock) { | |
5784 | dprintk("NFSD: %s: unable to allocate lock!\n", __func__); | |
5785 | status = nfserr_jukebox; | |
5786 | goto out; | |
5787 | } | |
5788 | ||
5789 | switch (lockt->lt_type) { | |
5790 | case NFS4_READ_LT: | |
5791 | case NFS4_READW_LT: | |
5792 | file_lock->fl_type = F_RDLCK; | |
5793 | break; | |
5794 | case NFS4_WRITE_LT: | |
5795 | case NFS4_WRITEW_LT: | |
5796 | file_lock->fl_type = F_WRLCK; | |
5797 | break; | |
5798 | default: | |
5799 | dprintk("NFSD: nfs4_lockt: bad lock type!\n"); | |
5800 | status = nfserr_inval; | |
5801 | goto out; | |
5802 | } | |
5803 | ||
5804 | lo = find_lockowner_str(cstate->clp, &lockt->lt_owner); | |
5805 | if (lo) | |
5806 | file_lock->fl_owner = (fl_owner_t)lo; | |
5807 | file_lock->fl_pid = current->tgid; | |
5808 | file_lock->fl_flags = FL_POSIX; | |
5809 | ||
5810 | file_lock->fl_start = lockt->lt_offset; | |
5811 | file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length); | |
5812 | ||
5813 | nfs4_transform_lock_offset(file_lock); | |
5814 | ||
5815 | status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock); | |
5816 | if (status) | |
5817 | goto out; | |
5818 | ||
5819 | if (file_lock->fl_type != F_UNLCK) { | |
5820 | status = nfserr_denied; | |
5821 | nfs4_set_lock_denied(file_lock, &lockt->lt_denied); | |
5822 | } | |
5823 | out: | |
5824 | if (lo) | |
5825 | nfs4_put_stateowner(&lo->lo_owner); | |
5826 | if (file_lock) | |
5827 | locks_free_lock(file_lock); | |
5828 | return status; | |
5829 | } | |
5830 | ||
5831 | __be32 | |
5832 | nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, | |
5833 | struct nfsd4_locku *locku) | |
5834 | { | |
5835 | struct nfs4_ol_stateid *stp; | |
5836 | struct file *filp = NULL; | |
5837 | struct file_lock *file_lock = NULL; | |
5838 | __be32 status; | |
5839 | int err; | |
5840 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
5841 | ||
5842 | dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n", | |
5843 | (long long) locku->lu_offset, | |
5844 | (long long) locku->lu_length); | |
5845 | ||
5846 | if (check_lock_length(locku->lu_offset, locku->lu_length)) | |
5847 | return nfserr_inval; | |
5848 | ||
5849 | status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid, | |
5850 | &locku->lu_stateid, NFS4_LOCK_STID, | |
5851 | &stp, nn); | |
5852 | if (status) | |
5853 | goto out; | |
5854 | filp = find_any_file(stp->st_stid.sc_file); | |
5855 | if (!filp) { | |
5856 | status = nfserr_lock_range; | |
5857 | goto put_stateid; | |
5858 | } | |
5859 | file_lock = locks_alloc_lock(); | |
5860 | if (!file_lock) { | |
5861 | dprintk("NFSD: %s: unable to allocate lock!\n", __func__); | |
5862 | status = nfserr_jukebox; | |
5863 | goto fput; | |
5864 | } | |
5865 | ||
5866 | file_lock->fl_type = F_UNLCK; | |
5867 | file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(stp->st_stateowner)); | |
5868 | file_lock->fl_pid = current->tgid; | |
5869 | file_lock->fl_file = filp; | |
5870 | file_lock->fl_flags = FL_POSIX; | |
5871 | file_lock->fl_lmops = &nfsd_posix_mng_ops; | |
5872 | file_lock->fl_start = locku->lu_offset; | |
5873 | ||
5874 | file_lock->fl_end = last_byte_offset(locku->lu_offset, | |
5875 | locku->lu_length); | |
5876 | nfs4_transform_lock_offset(file_lock); | |
5877 | ||
5878 | err = vfs_lock_file(filp, F_SETLK, file_lock, NULL); | |
5879 | if (err) { | |
5880 | dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n"); | |
5881 | goto out_nfserr; | |
5882 | } | |
5883 | nfs4_inc_and_copy_stateid(&locku->lu_stateid, &stp->st_stid); | |
5884 | fput: | |
5885 | fput(filp); | |
5886 | put_stateid: | |
5887 | mutex_unlock(&stp->st_mutex); | |
5888 | nfs4_put_stid(&stp->st_stid); | |
5889 | out: | |
5890 | nfsd4_bump_seqid(cstate, status); | |
5891 | if (file_lock) | |
5892 | locks_free_lock(file_lock); | |
5893 | return status; | |
5894 | ||
5895 | out_nfserr: | |
5896 | status = nfserrno(err); | |
5897 | goto fput; | |
5898 | } | |
5899 | ||
5900 | /* | |
5901 | * returns | |
5902 | * true: locks held by lockowner | |
5903 | * false: no locks held by lockowner | |
5904 | */ | |
5905 | static bool | |
5906 | check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner) | |
5907 | { | |
5908 | struct file_lock *fl; | |
5909 | int status = false; | |
5910 | struct file *filp = find_any_file(fp); | |
5911 | struct inode *inode; | |
5912 | struct file_lock_context *flctx; | |
5913 | ||
5914 | if (!filp) { | |
5915 | /* Any valid lock stateid should have some sort of access */ | |
5916 | WARN_ON_ONCE(1); | |
5917 | return status; | |
5918 | } | |
5919 | ||
5920 | inode = file_inode(filp); | |
5921 | flctx = inode->i_flctx; | |
5922 | ||
5923 | if (flctx && !list_empty_careful(&flctx->flc_posix)) { | |
5924 | spin_lock(&flctx->flc_lock); | |
5925 | list_for_each_entry(fl, &flctx->flc_posix, fl_list) { | |
5926 | if (fl->fl_owner == (fl_owner_t)lowner) { | |
5927 | status = true; | |
5928 | break; | |
5929 | } | |
5930 | } | |
5931 | spin_unlock(&flctx->flc_lock); | |
5932 | } | |
5933 | fput(filp); | |
5934 | return status; | |
5935 | } | |
5936 | ||
5937 | __be32 | |
5938 | nfsd4_release_lockowner(struct svc_rqst *rqstp, | |
5939 | struct nfsd4_compound_state *cstate, | |
5940 | struct nfsd4_release_lockowner *rlockowner) | |
5941 | { | |
5942 | clientid_t *clid = &rlockowner->rl_clientid; | |
5943 | struct nfs4_stateowner *sop; | |
5944 | struct nfs4_lockowner *lo = NULL; | |
5945 | struct nfs4_ol_stateid *stp; | |
5946 | struct xdr_netobj *owner = &rlockowner->rl_owner; | |
5947 | unsigned int hashval = ownerstr_hashval(owner); | |
5948 | __be32 status; | |
5949 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
5950 | struct nfs4_client *clp; | |
5951 | ||
5952 | dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n", | |
5953 | clid->cl_boot, clid->cl_id); | |
5954 | ||
5955 | status = lookup_clientid(clid, cstate, nn); | |
5956 | if (status) | |
5957 | return status; | |
5958 | ||
5959 | clp = cstate->clp; | |
5960 | /* Find the matching lock stateowner */ | |
5961 | spin_lock(&clp->cl_lock); | |
5962 | list_for_each_entry(sop, &clp->cl_ownerstr_hashtbl[hashval], | |
5963 | so_strhash) { | |
5964 | ||
5965 | if (sop->so_is_open_owner || !same_owner_str(sop, owner)) | |
5966 | continue; | |
5967 | ||
5968 | /* see if there are still any locks associated with it */ | |
5969 | lo = lockowner(sop); | |
5970 | list_for_each_entry(stp, &sop->so_stateids, st_perstateowner) { | |
5971 | if (check_for_locks(stp->st_stid.sc_file, lo)) { | |
5972 | status = nfserr_locks_held; | |
5973 | spin_unlock(&clp->cl_lock); | |
5974 | return status; | |
5975 | } | |
5976 | } | |
5977 | ||
5978 | nfs4_get_stateowner(sop); | |
5979 | break; | |
5980 | } | |
5981 | spin_unlock(&clp->cl_lock); | |
5982 | if (lo) | |
5983 | release_lockowner(lo); | |
5984 | return status; | |
5985 | } | |
5986 | ||
5987 | static inline struct nfs4_client_reclaim * | |
5988 | alloc_reclaim(void) | |
5989 | { | |
5990 | return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL); | |
5991 | } | |
5992 | ||
5993 | bool | |
5994 | nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn) | |
5995 | { | |
5996 | struct nfs4_client_reclaim *crp; | |
5997 | ||
5998 | crp = nfsd4_find_reclaim_client(name, nn); | |
5999 | return (crp && crp->cr_clp); | |
6000 | } | |
6001 | ||
6002 | /* | |
6003 | * failure => all reset bets are off, nfserr_no_grace... | |
6004 | */ | |
6005 | struct nfs4_client_reclaim * | |
6006 | nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn) | |
6007 | { | |
6008 | unsigned int strhashval; | |
6009 | struct nfs4_client_reclaim *crp; | |
6010 | ||
6011 | dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name); | |
6012 | crp = alloc_reclaim(); | |
6013 | if (crp) { | |
6014 | strhashval = clientstr_hashval(name); | |
6015 | INIT_LIST_HEAD(&crp->cr_strhash); | |
6016 | list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]); | |
6017 | memcpy(crp->cr_recdir, name, HEXDIR_LEN); | |
6018 | crp->cr_clp = NULL; | |
6019 | nn->reclaim_str_hashtbl_size++; | |
6020 | } | |
6021 | return crp; | |
6022 | } | |
6023 | ||
6024 | void | |
6025 | nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn) | |
6026 | { | |
6027 | list_del(&crp->cr_strhash); | |
6028 | kfree(crp); | |
6029 | nn->reclaim_str_hashtbl_size--; | |
6030 | } | |
6031 | ||
6032 | void | |
6033 | nfs4_release_reclaim(struct nfsd_net *nn) | |
6034 | { | |
6035 | struct nfs4_client_reclaim *crp = NULL; | |
6036 | int i; | |
6037 | ||
6038 | for (i = 0; i < CLIENT_HASH_SIZE; i++) { | |
6039 | while (!list_empty(&nn->reclaim_str_hashtbl[i])) { | |
6040 | crp = list_entry(nn->reclaim_str_hashtbl[i].next, | |
6041 | struct nfs4_client_reclaim, cr_strhash); | |
6042 | nfs4_remove_reclaim_record(crp, nn); | |
6043 | } | |
6044 | } | |
6045 | WARN_ON_ONCE(nn->reclaim_str_hashtbl_size); | |
6046 | } | |
6047 | ||
6048 | /* | |
6049 | * called from OPEN, CLAIM_PREVIOUS with a new clientid. */ | |
6050 | struct nfs4_client_reclaim * | |
6051 | nfsd4_find_reclaim_client(const char *recdir, struct nfsd_net *nn) | |
6052 | { | |
6053 | unsigned int strhashval; | |
6054 | struct nfs4_client_reclaim *crp = NULL; | |
6055 | ||
6056 | dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir); | |
6057 | ||
6058 | strhashval = clientstr_hashval(recdir); | |
6059 | list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) { | |
6060 | if (same_name(crp->cr_recdir, recdir)) { | |
6061 | return crp; | |
6062 | } | |
6063 | } | |
6064 | return NULL; | |
6065 | } | |
6066 | ||
6067 | /* | |
6068 | * Called from OPEN. Look for clientid in reclaim list. | |
6069 | */ | |
6070 | __be32 | |
6071 | nfs4_check_open_reclaim(clientid_t *clid, | |
6072 | struct nfsd4_compound_state *cstate, | |
6073 | struct nfsd_net *nn) | |
6074 | { | |
6075 | __be32 status; | |
6076 | ||
6077 | /* find clientid in conf_id_hashtbl */ | |
6078 | status = lookup_clientid(clid, cstate, nn); | |
6079 | if (status) | |
6080 | return nfserr_reclaim_bad; | |
6081 | ||
6082 | if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &cstate->clp->cl_flags)) | |
6083 | return nfserr_no_grace; | |
6084 | ||
6085 | if (nfsd4_client_record_check(cstate->clp)) | |
6086 | return nfserr_reclaim_bad; | |
6087 | ||
6088 | return nfs_ok; | |
6089 | } | |
6090 | ||
6091 | #ifdef CONFIG_NFSD_FAULT_INJECTION | |
6092 | static inline void | |
6093 | put_client(struct nfs4_client *clp) | |
6094 | { | |
6095 | atomic_dec(&clp->cl_refcount); | |
6096 | } | |
6097 | ||
6098 | static struct nfs4_client * | |
6099 | nfsd_find_client(struct sockaddr_storage *addr, size_t addr_size) | |
6100 | { | |
6101 | struct nfs4_client *clp; | |
6102 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6103 | nfsd_net_id); | |
6104 | ||
6105 | if (!nfsd_netns_ready(nn)) | |
6106 | return NULL; | |
6107 | ||
6108 | list_for_each_entry(clp, &nn->client_lru, cl_lru) { | |
6109 | if (memcmp(&clp->cl_addr, addr, addr_size) == 0) | |
6110 | return clp; | |
6111 | } | |
6112 | return NULL; | |
6113 | } | |
6114 | ||
6115 | u64 | |
6116 | nfsd_inject_print_clients(void) | |
6117 | { | |
6118 | struct nfs4_client *clp; | |
6119 | u64 count = 0; | |
6120 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6121 | nfsd_net_id); | |
6122 | char buf[INET6_ADDRSTRLEN]; | |
6123 | ||
6124 | if (!nfsd_netns_ready(nn)) | |
6125 | return 0; | |
6126 | ||
6127 | spin_lock(&nn->client_lock); | |
6128 | list_for_each_entry(clp, &nn->client_lru, cl_lru) { | |
6129 | rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf)); | |
6130 | pr_info("NFS Client: %s\n", buf); | |
6131 | ++count; | |
6132 | } | |
6133 | spin_unlock(&nn->client_lock); | |
6134 | ||
6135 | return count; | |
6136 | } | |
6137 | ||
6138 | u64 | |
6139 | nfsd_inject_forget_client(struct sockaddr_storage *addr, size_t addr_size) | |
6140 | { | |
6141 | u64 count = 0; | |
6142 | struct nfs4_client *clp; | |
6143 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6144 | nfsd_net_id); | |
6145 | ||
6146 | if (!nfsd_netns_ready(nn)) | |
6147 | return count; | |
6148 | ||
6149 | spin_lock(&nn->client_lock); | |
6150 | clp = nfsd_find_client(addr, addr_size); | |
6151 | if (clp) { | |
6152 | if (mark_client_expired_locked(clp) == nfs_ok) | |
6153 | ++count; | |
6154 | else | |
6155 | clp = NULL; | |
6156 | } | |
6157 | spin_unlock(&nn->client_lock); | |
6158 | ||
6159 | if (clp) | |
6160 | expire_client(clp); | |
6161 | ||
6162 | return count; | |
6163 | } | |
6164 | ||
6165 | u64 | |
6166 | nfsd_inject_forget_clients(u64 max) | |
6167 | { | |
6168 | u64 count = 0; | |
6169 | struct nfs4_client *clp, *next; | |
6170 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6171 | nfsd_net_id); | |
6172 | LIST_HEAD(reaplist); | |
6173 | ||
6174 | if (!nfsd_netns_ready(nn)) | |
6175 | return count; | |
6176 | ||
6177 | spin_lock(&nn->client_lock); | |
6178 | list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) { | |
6179 | if (mark_client_expired_locked(clp) == nfs_ok) { | |
6180 | list_add(&clp->cl_lru, &reaplist); | |
6181 | if (max != 0 && ++count >= max) | |
6182 | break; | |
6183 | } | |
6184 | } | |
6185 | spin_unlock(&nn->client_lock); | |
6186 | ||
6187 | list_for_each_entry_safe(clp, next, &reaplist, cl_lru) | |
6188 | expire_client(clp); | |
6189 | ||
6190 | return count; | |
6191 | } | |
6192 | ||
6193 | static void nfsd_print_count(struct nfs4_client *clp, unsigned int count, | |
6194 | const char *type) | |
6195 | { | |
6196 | char buf[INET6_ADDRSTRLEN]; | |
6197 | rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf)); | |
6198 | printk(KERN_INFO "NFS Client: %s has %u %s\n", buf, count, type); | |
6199 | } | |
6200 | ||
6201 | static void | |
6202 | nfsd_inject_add_lock_to_list(struct nfs4_ol_stateid *lst, | |
6203 | struct list_head *collect) | |
6204 | { | |
6205 | struct nfs4_client *clp = lst->st_stid.sc_client; | |
6206 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6207 | nfsd_net_id); | |
6208 | ||
6209 | if (!collect) | |
6210 | return; | |
6211 | ||
6212 | lockdep_assert_held(&nn->client_lock); | |
6213 | atomic_inc(&clp->cl_refcount); | |
6214 | list_add(&lst->st_locks, collect); | |
6215 | } | |
6216 | ||
6217 | static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max, | |
6218 | struct list_head *collect, | |
6219 | bool (*func)(struct nfs4_ol_stateid *)) | |
6220 | { | |
6221 | struct nfs4_openowner *oop; | |
6222 | struct nfs4_ol_stateid *stp, *st_next; | |
6223 | struct nfs4_ol_stateid *lst, *lst_next; | |
6224 | u64 count = 0; | |
6225 | ||
6226 | spin_lock(&clp->cl_lock); | |
6227 | list_for_each_entry(oop, &clp->cl_openowners, oo_perclient) { | |
6228 | list_for_each_entry_safe(stp, st_next, | |
6229 | &oop->oo_owner.so_stateids, st_perstateowner) { | |
6230 | list_for_each_entry_safe(lst, lst_next, | |
6231 | &stp->st_locks, st_locks) { | |
6232 | if (func) { | |
6233 | if (func(lst)) | |
6234 | nfsd_inject_add_lock_to_list(lst, | |
6235 | collect); | |
6236 | } | |
6237 | ++count; | |
6238 | /* | |
6239 | * Despite the fact that these functions deal | |
6240 | * with 64-bit integers for "count", we must | |
6241 | * ensure that it doesn't blow up the | |
6242 | * clp->cl_refcount. Throw a warning if we | |
6243 | * start to approach INT_MAX here. | |
6244 | */ | |
6245 | WARN_ON_ONCE(count == (INT_MAX / 2)); | |
6246 | if (count == max) | |
6247 | goto out; | |
6248 | } | |
6249 | } | |
6250 | } | |
6251 | out: | |
6252 | spin_unlock(&clp->cl_lock); | |
6253 | ||
6254 | return count; | |
6255 | } | |
6256 | ||
6257 | static u64 | |
6258 | nfsd_collect_client_locks(struct nfs4_client *clp, struct list_head *collect, | |
6259 | u64 max) | |
6260 | { | |
6261 | return nfsd_foreach_client_lock(clp, max, collect, unhash_lock_stateid); | |
6262 | } | |
6263 | ||
6264 | static u64 | |
6265 | nfsd_print_client_locks(struct nfs4_client *clp) | |
6266 | { | |
6267 | u64 count = nfsd_foreach_client_lock(clp, 0, NULL, NULL); | |
6268 | nfsd_print_count(clp, count, "locked files"); | |
6269 | return count; | |
6270 | } | |
6271 | ||
6272 | u64 | |
6273 | nfsd_inject_print_locks(void) | |
6274 | { | |
6275 | struct nfs4_client *clp; | |
6276 | u64 count = 0; | |
6277 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6278 | nfsd_net_id); | |
6279 | ||
6280 | if (!nfsd_netns_ready(nn)) | |
6281 | return 0; | |
6282 | ||
6283 | spin_lock(&nn->client_lock); | |
6284 | list_for_each_entry(clp, &nn->client_lru, cl_lru) | |
6285 | count += nfsd_print_client_locks(clp); | |
6286 | spin_unlock(&nn->client_lock); | |
6287 | ||
6288 | return count; | |
6289 | } | |
6290 | ||
6291 | static void | |
6292 | nfsd_reap_locks(struct list_head *reaplist) | |
6293 | { | |
6294 | struct nfs4_client *clp; | |
6295 | struct nfs4_ol_stateid *stp, *next; | |
6296 | ||
6297 | list_for_each_entry_safe(stp, next, reaplist, st_locks) { | |
6298 | list_del_init(&stp->st_locks); | |
6299 | clp = stp->st_stid.sc_client; | |
6300 | nfs4_put_stid(&stp->st_stid); | |
6301 | put_client(clp); | |
6302 | } | |
6303 | } | |
6304 | ||
6305 | u64 | |
6306 | nfsd_inject_forget_client_locks(struct sockaddr_storage *addr, size_t addr_size) | |
6307 | { | |
6308 | unsigned int count = 0; | |
6309 | struct nfs4_client *clp; | |
6310 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6311 | nfsd_net_id); | |
6312 | LIST_HEAD(reaplist); | |
6313 | ||
6314 | if (!nfsd_netns_ready(nn)) | |
6315 | return count; | |
6316 | ||
6317 | spin_lock(&nn->client_lock); | |
6318 | clp = nfsd_find_client(addr, addr_size); | |
6319 | if (clp) | |
6320 | count = nfsd_collect_client_locks(clp, &reaplist, 0); | |
6321 | spin_unlock(&nn->client_lock); | |
6322 | nfsd_reap_locks(&reaplist); | |
6323 | return count; | |
6324 | } | |
6325 | ||
6326 | u64 | |
6327 | nfsd_inject_forget_locks(u64 max) | |
6328 | { | |
6329 | u64 count = 0; | |
6330 | struct nfs4_client *clp; | |
6331 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6332 | nfsd_net_id); | |
6333 | LIST_HEAD(reaplist); | |
6334 | ||
6335 | if (!nfsd_netns_ready(nn)) | |
6336 | return count; | |
6337 | ||
6338 | spin_lock(&nn->client_lock); | |
6339 | list_for_each_entry(clp, &nn->client_lru, cl_lru) { | |
6340 | count += nfsd_collect_client_locks(clp, &reaplist, max - count); | |
6341 | if (max != 0 && count >= max) | |
6342 | break; | |
6343 | } | |
6344 | spin_unlock(&nn->client_lock); | |
6345 | nfsd_reap_locks(&reaplist); | |
6346 | return count; | |
6347 | } | |
6348 | ||
6349 | static u64 | |
6350 | nfsd_foreach_client_openowner(struct nfs4_client *clp, u64 max, | |
6351 | struct list_head *collect, | |
6352 | void (*func)(struct nfs4_openowner *)) | |
6353 | { | |
6354 | struct nfs4_openowner *oop, *next; | |
6355 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6356 | nfsd_net_id); | |
6357 | u64 count = 0; | |
6358 | ||
6359 | lockdep_assert_held(&nn->client_lock); | |
6360 | ||
6361 | spin_lock(&clp->cl_lock); | |
6362 | list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) { | |
6363 | if (func) { | |
6364 | func(oop); | |
6365 | if (collect) { | |
6366 | atomic_inc(&clp->cl_refcount); | |
6367 | list_add(&oop->oo_perclient, collect); | |
6368 | } | |
6369 | } | |
6370 | ++count; | |
6371 | /* | |
6372 | * Despite the fact that these functions deal with | |
6373 | * 64-bit integers for "count", we must ensure that | |
6374 | * it doesn't blow up the clp->cl_refcount. Throw a | |
6375 | * warning if we start to approach INT_MAX here. | |
6376 | */ | |
6377 | WARN_ON_ONCE(count == (INT_MAX / 2)); | |
6378 | if (count == max) | |
6379 | break; | |
6380 | } | |
6381 | spin_unlock(&clp->cl_lock); | |
6382 | ||
6383 | return count; | |
6384 | } | |
6385 | ||
6386 | static u64 | |
6387 | nfsd_print_client_openowners(struct nfs4_client *clp) | |
6388 | { | |
6389 | u64 count = nfsd_foreach_client_openowner(clp, 0, NULL, NULL); | |
6390 | ||
6391 | nfsd_print_count(clp, count, "openowners"); | |
6392 | return count; | |
6393 | } | |
6394 | ||
6395 | static u64 | |
6396 | nfsd_collect_client_openowners(struct nfs4_client *clp, | |
6397 | struct list_head *collect, u64 max) | |
6398 | { | |
6399 | return nfsd_foreach_client_openowner(clp, max, collect, | |
6400 | unhash_openowner_locked); | |
6401 | } | |
6402 | ||
6403 | u64 | |
6404 | nfsd_inject_print_openowners(void) | |
6405 | { | |
6406 | struct nfs4_client *clp; | |
6407 | u64 count = 0; | |
6408 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6409 | nfsd_net_id); | |
6410 | ||
6411 | if (!nfsd_netns_ready(nn)) | |
6412 | return 0; | |
6413 | ||
6414 | spin_lock(&nn->client_lock); | |
6415 | list_for_each_entry(clp, &nn->client_lru, cl_lru) | |
6416 | count += nfsd_print_client_openowners(clp); | |
6417 | spin_unlock(&nn->client_lock); | |
6418 | ||
6419 | return count; | |
6420 | } | |
6421 | ||
6422 | static void | |
6423 | nfsd_reap_openowners(struct list_head *reaplist) | |
6424 | { | |
6425 | struct nfs4_client *clp; | |
6426 | struct nfs4_openowner *oop, *next; | |
6427 | ||
6428 | list_for_each_entry_safe(oop, next, reaplist, oo_perclient) { | |
6429 | list_del_init(&oop->oo_perclient); | |
6430 | clp = oop->oo_owner.so_client; | |
6431 | release_openowner(oop); | |
6432 | put_client(clp); | |
6433 | } | |
6434 | } | |
6435 | ||
6436 | u64 | |
6437 | nfsd_inject_forget_client_openowners(struct sockaddr_storage *addr, | |
6438 | size_t addr_size) | |
6439 | { | |
6440 | unsigned int count = 0; | |
6441 | struct nfs4_client *clp; | |
6442 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6443 | nfsd_net_id); | |
6444 | LIST_HEAD(reaplist); | |
6445 | ||
6446 | if (!nfsd_netns_ready(nn)) | |
6447 | return count; | |
6448 | ||
6449 | spin_lock(&nn->client_lock); | |
6450 | clp = nfsd_find_client(addr, addr_size); | |
6451 | if (clp) | |
6452 | count = nfsd_collect_client_openowners(clp, &reaplist, 0); | |
6453 | spin_unlock(&nn->client_lock); | |
6454 | nfsd_reap_openowners(&reaplist); | |
6455 | return count; | |
6456 | } | |
6457 | ||
6458 | u64 | |
6459 | nfsd_inject_forget_openowners(u64 max) | |
6460 | { | |
6461 | u64 count = 0; | |
6462 | struct nfs4_client *clp; | |
6463 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6464 | nfsd_net_id); | |
6465 | LIST_HEAD(reaplist); | |
6466 | ||
6467 | if (!nfsd_netns_ready(nn)) | |
6468 | return count; | |
6469 | ||
6470 | spin_lock(&nn->client_lock); | |
6471 | list_for_each_entry(clp, &nn->client_lru, cl_lru) { | |
6472 | count += nfsd_collect_client_openowners(clp, &reaplist, | |
6473 | max - count); | |
6474 | if (max != 0 && count >= max) | |
6475 | break; | |
6476 | } | |
6477 | spin_unlock(&nn->client_lock); | |
6478 | nfsd_reap_openowners(&reaplist); | |
6479 | return count; | |
6480 | } | |
6481 | ||
6482 | static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max, | |
6483 | struct list_head *victims) | |
6484 | { | |
6485 | struct nfs4_delegation *dp, *next; | |
6486 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6487 | nfsd_net_id); | |
6488 | u64 count = 0; | |
6489 | ||
6490 | lockdep_assert_held(&nn->client_lock); | |
6491 | ||
6492 | spin_lock(&state_lock); | |
6493 | list_for_each_entry_safe(dp, next, &clp->cl_delegations, dl_perclnt) { | |
6494 | if (victims) { | |
6495 | /* | |
6496 | * It's not safe to mess with delegations that have a | |
6497 | * non-zero dl_time. They might have already been broken | |
6498 | * and could be processed by the laundromat outside of | |
6499 | * the state_lock. Just leave them be. | |
6500 | */ | |
6501 | if (dp->dl_time != 0) | |
6502 | continue; | |
6503 | ||
6504 | atomic_inc(&clp->cl_refcount); | |
6505 | WARN_ON(!unhash_delegation_locked(dp)); | |
6506 | list_add(&dp->dl_recall_lru, victims); | |
6507 | } | |
6508 | ++count; | |
6509 | /* | |
6510 | * Despite the fact that these functions deal with | |
6511 | * 64-bit integers for "count", we must ensure that | |
6512 | * it doesn't blow up the clp->cl_refcount. Throw a | |
6513 | * warning if we start to approach INT_MAX here. | |
6514 | */ | |
6515 | WARN_ON_ONCE(count == (INT_MAX / 2)); | |
6516 | if (count == max) | |
6517 | break; | |
6518 | } | |
6519 | spin_unlock(&state_lock); | |
6520 | return count; | |
6521 | } | |
6522 | ||
6523 | static u64 | |
6524 | nfsd_print_client_delegations(struct nfs4_client *clp) | |
6525 | { | |
6526 | u64 count = nfsd_find_all_delegations(clp, 0, NULL); | |
6527 | ||
6528 | nfsd_print_count(clp, count, "delegations"); | |
6529 | return count; | |
6530 | } | |
6531 | ||
6532 | u64 | |
6533 | nfsd_inject_print_delegations(void) | |
6534 | { | |
6535 | struct nfs4_client *clp; | |
6536 | u64 count = 0; | |
6537 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6538 | nfsd_net_id); | |
6539 | ||
6540 | if (!nfsd_netns_ready(nn)) | |
6541 | return 0; | |
6542 | ||
6543 | spin_lock(&nn->client_lock); | |
6544 | list_for_each_entry(clp, &nn->client_lru, cl_lru) | |
6545 | count += nfsd_print_client_delegations(clp); | |
6546 | spin_unlock(&nn->client_lock); | |
6547 | ||
6548 | return count; | |
6549 | } | |
6550 | ||
6551 | static void | |
6552 | nfsd_forget_delegations(struct list_head *reaplist) | |
6553 | { | |
6554 | struct nfs4_client *clp; | |
6555 | struct nfs4_delegation *dp, *next; | |
6556 | ||
6557 | list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) { | |
6558 | list_del_init(&dp->dl_recall_lru); | |
6559 | clp = dp->dl_stid.sc_client; | |
6560 | revoke_delegation(dp); | |
6561 | put_client(clp); | |
6562 | } | |
6563 | } | |
6564 | ||
6565 | u64 | |
6566 | nfsd_inject_forget_client_delegations(struct sockaddr_storage *addr, | |
6567 | size_t addr_size) | |
6568 | { | |
6569 | u64 count = 0; | |
6570 | struct nfs4_client *clp; | |
6571 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6572 | nfsd_net_id); | |
6573 | LIST_HEAD(reaplist); | |
6574 | ||
6575 | if (!nfsd_netns_ready(nn)) | |
6576 | return count; | |
6577 | ||
6578 | spin_lock(&nn->client_lock); | |
6579 | clp = nfsd_find_client(addr, addr_size); | |
6580 | if (clp) | |
6581 | count = nfsd_find_all_delegations(clp, 0, &reaplist); | |
6582 | spin_unlock(&nn->client_lock); | |
6583 | ||
6584 | nfsd_forget_delegations(&reaplist); | |
6585 | return count; | |
6586 | } | |
6587 | ||
6588 | u64 | |
6589 | nfsd_inject_forget_delegations(u64 max) | |
6590 | { | |
6591 | u64 count = 0; | |
6592 | struct nfs4_client *clp; | |
6593 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6594 | nfsd_net_id); | |
6595 | LIST_HEAD(reaplist); | |
6596 | ||
6597 | if (!nfsd_netns_ready(nn)) | |
6598 | return count; | |
6599 | ||
6600 | spin_lock(&nn->client_lock); | |
6601 | list_for_each_entry(clp, &nn->client_lru, cl_lru) { | |
6602 | count += nfsd_find_all_delegations(clp, max - count, &reaplist); | |
6603 | if (max != 0 && count >= max) | |
6604 | break; | |
6605 | } | |
6606 | spin_unlock(&nn->client_lock); | |
6607 | nfsd_forget_delegations(&reaplist); | |
6608 | return count; | |
6609 | } | |
6610 | ||
6611 | static void | |
6612 | nfsd_recall_delegations(struct list_head *reaplist) | |
6613 | { | |
6614 | struct nfs4_client *clp; | |
6615 | struct nfs4_delegation *dp, *next; | |
6616 | ||
6617 | list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) { | |
6618 | list_del_init(&dp->dl_recall_lru); | |
6619 | clp = dp->dl_stid.sc_client; | |
6620 | /* | |
6621 | * We skipped all entries that had a zero dl_time before, | |
6622 | * so we can now reset the dl_time back to 0. If a delegation | |
6623 | * break comes in now, then it won't make any difference since | |
6624 | * we're recalling it either way. | |
6625 | */ | |
6626 | spin_lock(&state_lock); | |
6627 | dp->dl_time = 0; | |
6628 | spin_unlock(&state_lock); | |
6629 | nfsd_break_one_deleg(dp); | |
6630 | put_client(clp); | |
6631 | } | |
6632 | } | |
6633 | ||
6634 | u64 | |
6635 | nfsd_inject_recall_client_delegations(struct sockaddr_storage *addr, | |
6636 | size_t addr_size) | |
6637 | { | |
6638 | u64 count = 0; | |
6639 | struct nfs4_client *clp; | |
6640 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6641 | nfsd_net_id); | |
6642 | LIST_HEAD(reaplist); | |
6643 | ||
6644 | if (!nfsd_netns_ready(nn)) | |
6645 | return count; | |
6646 | ||
6647 | spin_lock(&nn->client_lock); | |
6648 | clp = nfsd_find_client(addr, addr_size); | |
6649 | if (clp) | |
6650 | count = nfsd_find_all_delegations(clp, 0, &reaplist); | |
6651 | spin_unlock(&nn->client_lock); | |
6652 | ||
6653 | nfsd_recall_delegations(&reaplist); | |
6654 | return count; | |
6655 | } | |
6656 | ||
6657 | u64 | |
6658 | nfsd_inject_recall_delegations(u64 max) | |
6659 | { | |
6660 | u64 count = 0; | |
6661 | struct nfs4_client *clp, *next; | |
6662 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6663 | nfsd_net_id); | |
6664 | LIST_HEAD(reaplist); | |
6665 | ||
6666 | if (!nfsd_netns_ready(nn)) | |
6667 | return count; | |
6668 | ||
6669 | spin_lock(&nn->client_lock); | |
6670 | list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) { | |
6671 | count += nfsd_find_all_delegations(clp, max - count, &reaplist); | |
6672 | if (max != 0 && ++count >= max) | |
6673 | break; | |
6674 | } | |
6675 | spin_unlock(&nn->client_lock); | |
6676 | nfsd_recall_delegations(&reaplist); | |
6677 | return count; | |
6678 | } | |
6679 | #endif /* CONFIG_NFSD_FAULT_INJECTION */ | |
6680 | ||
6681 | /* | |
6682 | * Since the lifetime of a delegation isn't limited to that of an open, a | |
6683 | * client may quite reasonably hang on to a delegation as long as it has | |
6684 | * the inode cached. This becomes an obvious problem the first time a | |
6685 | * client's inode cache approaches the size of the server's total memory. | |
6686 | * | |
6687 | * For now we avoid this problem by imposing a hard limit on the number | |
6688 | * of delegations, which varies according to the server's memory size. | |
6689 | */ | |
6690 | static void | |
6691 | set_max_delegations(void) | |
6692 | { | |
6693 | /* | |
6694 | * Allow at most 4 delegations per megabyte of RAM. Quick | |
6695 | * estimates suggest that in the worst case (where every delegation | |
6696 | * is for a different inode), a delegation could take about 1.5K, | |
6697 | * giving a worst case usage of about 6% of memory. | |
6698 | */ | |
6699 | max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT); | |
6700 | } | |
6701 | ||
6702 | static int nfs4_state_create_net(struct net *net) | |
6703 | { | |
6704 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
6705 | int i; | |
6706 | ||
6707 | nn->conf_id_hashtbl = kmalloc(sizeof(struct list_head) * | |
6708 | CLIENT_HASH_SIZE, GFP_KERNEL); | |
6709 | if (!nn->conf_id_hashtbl) | |
6710 | goto err; | |
6711 | nn->unconf_id_hashtbl = kmalloc(sizeof(struct list_head) * | |
6712 | CLIENT_HASH_SIZE, GFP_KERNEL); | |
6713 | if (!nn->unconf_id_hashtbl) | |
6714 | goto err_unconf_id; | |
6715 | nn->sessionid_hashtbl = kmalloc(sizeof(struct list_head) * | |
6716 | SESSION_HASH_SIZE, GFP_KERNEL); | |
6717 | if (!nn->sessionid_hashtbl) | |
6718 | goto err_sessionid; | |
6719 | ||
6720 | for (i = 0; i < CLIENT_HASH_SIZE; i++) { | |
6721 | INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]); | |
6722 | INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]); | |
6723 | } | |
6724 | for (i = 0; i < SESSION_HASH_SIZE; i++) | |
6725 | INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]); | |
6726 | nn->conf_name_tree = RB_ROOT; | |
6727 | nn->unconf_name_tree = RB_ROOT; | |
6728 | INIT_LIST_HEAD(&nn->client_lru); | |
6729 | INIT_LIST_HEAD(&nn->close_lru); | |
6730 | INIT_LIST_HEAD(&nn->del_recall_lru); | |
6731 | spin_lock_init(&nn->client_lock); | |
6732 | ||
6733 | INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main); | |
6734 | get_net(net); | |
6735 | ||
6736 | return 0; | |
6737 | ||
6738 | err_sessionid: | |
6739 | kfree(nn->unconf_id_hashtbl); | |
6740 | err_unconf_id: | |
6741 | kfree(nn->conf_id_hashtbl); | |
6742 | err: | |
6743 | return -ENOMEM; | |
6744 | } | |
6745 | ||
6746 | static void | |
6747 | nfs4_state_destroy_net(struct net *net) | |
6748 | { | |
6749 | int i; | |
6750 | struct nfs4_client *clp = NULL; | |
6751 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
6752 | ||
6753 | for (i = 0; i < CLIENT_HASH_SIZE; i++) { | |
6754 | while (!list_empty(&nn->conf_id_hashtbl[i])) { | |
6755 | clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash); | |
6756 | destroy_client(clp); | |
6757 | } | |
6758 | } | |
6759 | ||
6760 | for (i = 0; i < CLIENT_HASH_SIZE; i++) { | |
6761 | while (!list_empty(&nn->unconf_id_hashtbl[i])) { | |
6762 | clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash); | |
6763 | destroy_client(clp); | |
6764 | } | |
6765 | } | |
6766 | ||
6767 | kfree(nn->sessionid_hashtbl); | |
6768 | kfree(nn->unconf_id_hashtbl); | |
6769 | kfree(nn->conf_id_hashtbl); | |
6770 | put_net(net); | |
6771 | } | |
6772 | ||
6773 | int | |
6774 | nfs4_state_start_net(struct net *net) | |
6775 | { | |
6776 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
6777 | int ret; | |
6778 | ||
6779 | ret = nfs4_state_create_net(net); | |
6780 | if (ret) | |
6781 | return ret; | |
6782 | nn->boot_time = get_seconds(); | |
6783 | nn->grace_ended = false; | |
6784 | nn->nfsd4_manager.block_opens = true; | |
6785 | locks_start_grace(net, &nn->nfsd4_manager); | |
6786 | nfsd4_client_tracking_init(net); | |
6787 | printk(KERN_INFO "NFSD: starting %ld-second grace period (net %p)\n", | |
6788 | nn->nfsd4_grace, net); | |
6789 | queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ); | |
6790 | return 0; | |
6791 | } | |
6792 | ||
6793 | /* initialization to perform when the nfsd service is started: */ | |
6794 | ||
6795 | int | |
6796 | nfs4_state_start(void) | |
6797 | { | |
6798 | int ret; | |
6799 | ||
6800 | ret = set_callback_cred(); | |
6801 | if (ret) | |
6802 | return -ENOMEM; | |
6803 | laundry_wq = alloc_workqueue("%s", WQ_UNBOUND, 0, "nfsd4"); | |
6804 | if (laundry_wq == NULL) { | |
6805 | ret = -ENOMEM; | |
6806 | goto out_recovery; | |
6807 | } | |
6808 | ret = nfsd4_create_callback_queue(); | |
6809 | if (ret) | |
6810 | goto out_free_laundry; | |
6811 | ||
6812 | set_max_delegations(); | |
6813 | ||
6814 | return 0; | |
6815 | ||
6816 | out_free_laundry: | |
6817 | destroy_workqueue(laundry_wq); | |
6818 | out_recovery: | |
6819 | return ret; | |
6820 | } | |
6821 | ||
6822 | void | |
6823 | nfs4_state_shutdown_net(struct net *net) | |
6824 | { | |
6825 | struct nfs4_delegation *dp = NULL; | |
6826 | struct list_head *pos, *next, reaplist; | |
6827 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
6828 | ||
6829 | cancel_delayed_work_sync(&nn->laundromat_work); | |
6830 | locks_end_grace(&nn->nfsd4_manager); | |
6831 | ||
6832 | INIT_LIST_HEAD(&reaplist); | |
6833 | spin_lock(&state_lock); | |
6834 | list_for_each_safe(pos, next, &nn->del_recall_lru) { | |
6835 | dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); | |
6836 | WARN_ON(!unhash_delegation_locked(dp)); | |
6837 | list_add(&dp->dl_recall_lru, &reaplist); | |
6838 | } | |
6839 | spin_unlock(&state_lock); | |
6840 | list_for_each_safe(pos, next, &reaplist) { | |
6841 | dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); | |
6842 | list_del_init(&dp->dl_recall_lru); | |
6843 | put_clnt_odstate(dp->dl_clnt_odstate); | |
6844 | nfs4_put_deleg_lease(dp->dl_stid.sc_file); | |
6845 | nfs4_put_stid(&dp->dl_stid); | |
6846 | } | |
6847 | ||
6848 | nfsd4_client_tracking_exit(net); | |
6849 | nfs4_state_destroy_net(net); | |
6850 | } | |
6851 | ||
6852 | void | |
6853 | nfs4_state_shutdown(void) | |
6854 | { | |
6855 | destroy_workqueue(laundry_wq); | |
6856 | nfsd4_destroy_callback_queue(); | |
6857 | } | |
6858 | ||
6859 | static void | |
6860 | get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid) | |
6861 | { | |
6862 | if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid)) | |
6863 | memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t)); | |
6864 | } | |
6865 | ||
6866 | static void | |
6867 | put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid) | |
6868 | { | |
6869 | if (cstate->minorversion) { | |
6870 | memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t)); | |
6871 | SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG); | |
6872 | } | |
6873 | } | |
6874 | ||
6875 | void | |
6876 | clear_current_stateid(struct nfsd4_compound_state *cstate) | |
6877 | { | |
6878 | CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG); | |
6879 | } | |
6880 | ||
6881 | /* | |
6882 | * functions to set current state id | |
6883 | */ | |
6884 | void | |
6885 | nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp) | |
6886 | { | |
6887 | put_stateid(cstate, &odp->od_stateid); | |
6888 | } | |
6889 | ||
6890 | void | |
6891 | nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, struct nfsd4_open *open) | |
6892 | { | |
6893 | put_stateid(cstate, &open->op_stateid); | |
6894 | } | |
6895 | ||
6896 | void | |
6897 | nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close) | |
6898 | { | |
6899 | put_stateid(cstate, &close->cl_stateid); | |
6900 | } | |
6901 | ||
6902 | void | |
6903 | nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, struct nfsd4_lock *lock) | |
6904 | { | |
6905 | put_stateid(cstate, &lock->lk_resp_stateid); | |
6906 | } | |
6907 | ||
6908 | /* | |
6909 | * functions to consume current state id | |
6910 | */ | |
6911 | ||
6912 | void | |
6913 | nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp) | |
6914 | { | |
6915 | get_stateid(cstate, &odp->od_stateid); | |
6916 | } | |
6917 | ||
6918 | void | |
6919 | nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, struct nfsd4_delegreturn *drp) | |
6920 | { | |
6921 | get_stateid(cstate, &drp->dr_stateid); | |
6922 | } | |
6923 | ||
6924 | void | |
6925 | nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, struct nfsd4_free_stateid *fsp) | |
6926 | { | |
6927 | get_stateid(cstate, &fsp->fr_stateid); | |
6928 | } | |
6929 | ||
6930 | void | |
6931 | nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, struct nfsd4_setattr *setattr) | |
6932 | { | |
6933 | get_stateid(cstate, &setattr->sa_stateid); | |
6934 | } | |
6935 | ||
6936 | void | |
6937 | nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close) | |
6938 | { | |
6939 | get_stateid(cstate, &close->cl_stateid); | |
6940 | } | |
6941 | ||
6942 | void | |
6943 | nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, struct nfsd4_locku *locku) | |
6944 | { | |
6945 | get_stateid(cstate, &locku->lu_stateid); | |
6946 | } | |
6947 | ||
6948 | void | |
6949 | nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, struct nfsd4_read *read) | |
6950 | { | |
6951 | get_stateid(cstate, &read->rd_stateid); | |
6952 | } | |
6953 | ||
6954 | void | |
6955 | nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, struct nfsd4_write *write) | |
6956 | { | |
6957 | get_stateid(cstate, &write->wr_stateid); | |
6958 | } |