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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 | static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops; | |
103 | ||
104 | static bool is_session_dead(struct nfsd4_session *ses) | |
105 | { | |
106 | return ses->se_flags & NFS4_SESSION_DEAD; | |
107 | } | |
108 | ||
109 | static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me) | |
110 | { | |
111 | if (atomic_read(&ses->se_ref) > ref_held_by_me) | |
112 | return nfserr_jukebox; | |
113 | ses->se_flags |= NFS4_SESSION_DEAD; | |
114 | return nfs_ok; | |
115 | } | |
116 | ||
117 | static bool is_client_expired(struct nfs4_client *clp) | |
118 | { | |
119 | return clp->cl_time == 0; | |
120 | } | |
121 | ||
122 | static __be32 get_client_locked(struct nfs4_client *clp) | |
123 | { | |
124 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
125 | ||
126 | lockdep_assert_held(&nn->client_lock); | |
127 | ||
128 | if (is_client_expired(clp)) | |
129 | return nfserr_expired; | |
130 | atomic_inc(&clp->cl_refcount); | |
131 | return nfs_ok; | |
132 | } | |
133 | ||
134 | /* must be called under the client_lock */ | |
135 | static inline void | |
136 | renew_client_locked(struct nfs4_client *clp) | |
137 | { | |
138 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
139 | ||
140 | if (is_client_expired(clp)) { | |
141 | WARN_ON(1); | |
142 | printk("%s: client (clientid %08x/%08x) already expired\n", | |
143 | __func__, | |
144 | clp->cl_clientid.cl_boot, | |
145 | clp->cl_clientid.cl_id); | |
146 | return; | |
147 | } | |
148 | ||
149 | dprintk("renewing client (clientid %08x/%08x)\n", | |
150 | clp->cl_clientid.cl_boot, | |
151 | clp->cl_clientid.cl_id); | |
152 | list_move_tail(&clp->cl_lru, &nn->client_lru); | |
153 | clp->cl_time = get_seconds(); | |
154 | } | |
155 | ||
156 | static void put_client_renew_locked(struct nfs4_client *clp) | |
157 | { | |
158 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
159 | ||
160 | lockdep_assert_held(&nn->client_lock); | |
161 | ||
162 | if (!atomic_dec_and_test(&clp->cl_refcount)) | |
163 | return; | |
164 | if (!is_client_expired(clp)) | |
165 | renew_client_locked(clp); | |
166 | } | |
167 | ||
168 | static void put_client_renew(struct nfs4_client *clp) | |
169 | { | |
170 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
171 | ||
172 | if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock)) | |
173 | return; | |
174 | if (!is_client_expired(clp)) | |
175 | renew_client_locked(clp); | |
176 | spin_unlock(&nn->client_lock); | |
177 | } | |
178 | ||
179 | static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses) | |
180 | { | |
181 | __be32 status; | |
182 | ||
183 | if (is_session_dead(ses)) | |
184 | return nfserr_badsession; | |
185 | status = get_client_locked(ses->se_client); | |
186 | if (status) | |
187 | return status; | |
188 | atomic_inc(&ses->se_ref); | |
189 | return nfs_ok; | |
190 | } | |
191 | ||
192 | static void nfsd4_put_session_locked(struct nfsd4_session *ses) | |
193 | { | |
194 | struct nfs4_client *clp = ses->se_client; | |
195 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
196 | ||
197 | lockdep_assert_held(&nn->client_lock); | |
198 | ||
199 | if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses)) | |
200 | free_session(ses); | |
201 | put_client_renew_locked(clp); | |
202 | } | |
203 | ||
204 | static void nfsd4_put_session(struct nfsd4_session *ses) | |
205 | { | |
206 | struct nfs4_client *clp = ses->se_client; | |
207 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
208 | ||
209 | spin_lock(&nn->client_lock); | |
210 | nfsd4_put_session_locked(ses); | |
211 | spin_unlock(&nn->client_lock); | |
212 | } | |
213 | ||
214 | static struct nfsd4_blocked_lock * | |
215 | find_blocked_lock(struct nfs4_lockowner *lo, struct knfsd_fh *fh, | |
216 | struct nfsd_net *nn) | |
217 | { | |
218 | struct nfsd4_blocked_lock *cur, *found = NULL; | |
219 | ||
220 | spin_lock(&nn->blocked_locks_lock); | |
221 | list_for_each_entry(cur, &lo->lo_blocked, nbl_list) { | |
222 | if (fh_match(fh, &cur->nbl_fh)) { | |
223 | list_del_init(&cur->nbl_list); | |
224 | list_del_init(&cur->nbl_lru); | |
225 | found = cur; | |
226 | break; | |
227 | } | |
228 | } | |
229 | spin_unlock(&nn->blocked_locks_lock); | |
230 | if (found) | |
231 | posix_unblock_lock(&found->nbl_lock); | |
232 | return found; | |
233 | } | |
234 | ||
235 | static struct nfsd4_blocked_lock * | |
236 | find_or_allocate_block(struct nfs4_lockowner *lo, struct knfsd_fh *fh, | |
237 | struct nfsd_net *nn) | |
238 | { | |
239 | struct nfsd4_blocked_lock *nbl; | |
240 | ||
241 | nbl = find_blocked_lock(lo, fh, nn); | |
242 | if (!nbl) { | |
243 | nbl= kmalloc(sizeof(*nbl), GFP_KERNEL); | |
244 | if (nbl) { | |
245 | fh_copy_shallow(&nbl->nbl_fh, fh); | |
246 | locks_init_lock(&nbl->nbl_lock); | |
247 | nfsd4_init_cb(&nbl->nbl_cb, lo->lo_owner.so_client, | |
248 | &nfsd4_cb_notify_lock_ops, | |
249 | NFSPROC4_CLNT_CB_NOTIFY_LOCK); | |
250 | } | |
251 | } | |
252 | return nbl; | |
253 | } | |
254 | ||
255 | static void | |
256 | free_blocked_lock(struct nfsd4_blocked_lock *nbl) | |
257 | { | |
258 | locks_release_private(&nbl->nbl_lock); | |
259 | kfree(nbl); | |
260 | } | |
261 | ||
262 | static int | |
263 | nfsd4_cb_notify_lock_done(struct nfsd4_callback *cb, struct rpc_task *task) | |
264 | { | |
265 | /* | |
266 | * Since this is just an optimization, we don't try very hard if it | |
267 | * turns out not to succeed. We'll requeue it on NFS4ERR_DELAY, and | |
268 | * just quit trying on anything else. | |
269 | */ | |
270 | switch (task->tk_status) { | |
271 | case -NFS4ERR_DELAY: | |
272 | rpc_delay(task, 1 * HZ); | |
273 | return 0; | |
274 | default: | |
275 | return 1; | |
276 | } | |
277 | } | |
278 | ||
279 | static void | |
280 | nfsd4_cb_notify_lock_release(struct nfsd4_callback *cb) | |
281 | { | |
282 | struct nfsd4_blocked_lock *nbl = container_of(cb, | |
283 | struct nfsd4_blocked_lock, nbl_cb); | |
284 | ||
285 | free_blocked_lock(nbl); | |
286 | } | |
287 | ||
288 | static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops = { | |
289 | .done = nfsd4_cb_notify_lock_done, | |
290 | .release = nfsd4_cb_notify_lock_release, | |
291 | }; | |
292 | ||
293 | static inline struct nfs4_stateowner * | |
294 | nfs4_get_stateowner(struct nfs4_stateowner *sop) | |
295 | { | |
296 | atomic_inc(&sop->so_count); | |
297 | return sop; | |
298 | } | |
299 | ||
300 | static int | |
301 | same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner) | |
302 | { | |
303 | return (sop->so_owner.len == owner->len) && | |
304 | 0 == memcmp(sop->so_owner.data, owner->data, owner->len); | |
305 | } | |
306 | ||
307 | static struct nfs4_openowner * | |
308 | find_openstateowner_str_locked(unsigned int hashval, struct nfsd4_open *open, | |
309 | struct nfs4_client *clp) | |
310 | { | |
311 | struct nfs4_stateowner *so; | |
312 | ||
313 | lockdep_assert_held(&clp->cl_lock); | |
314 | ||
315 | list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[hashval], | |
316 | so_strhash) { | |
317 | if (!so->so_is_open_owner) | |
318 | continue; | |
319 | if (same_owner_str(so, &open->op_owner)) | |
320 | return openowner(nfs4_get_stateowner(so)); | |
321 | } | |
322 | return NULL; | |
323 | } | |
324 | ||
325 | static struct nfs4_openowner * | |
326 | find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open, | |
327 | struct nfs4_client *clp) | |
328 | { | |
329 | struct nfs4_openowner *oo; | |
330 | ||
331 | spin_lock(&clp->cl_lock); | |
332 | oo = find_openstateowner_str_locked(hashval, open, clp); | |
333 | spin_unlock(&clp->cl_lock); | |
334 | return oo; | |
335 | } | |
336 | ||
337 | static inline u32 | |
338 | opaque_hashval(const void *ptr, int nbytes) | |
339 | { | |
340 | unsigned char *cptr = (unsigned char *) ptr; | |
341 | ||
342 | u32 x = 0; | |
343 | while (nbytes--) { | |
344 | x *= 37; | |
345 | x += *cptr++; | |
346 | } | |
347 | return x; | |
348 | } | |
349 | ||
350 | static void nfsd4_free_file_rcu(struct rcu_head *rcu) | |
351 | { | |
352 | struct nfs4_file *fp = container_of(rcu, struct nfs4_file, fi_rcu); | |
353 | ||
354 | kmem_cache_free(file_slab, fp); | |
355 | } | |
356 | ||
357 | void | |
358 | put_nfs4_file(struct nfs4_file *fi) | |
359 | { | |
360 | might_lock(&state_lock); | |
361 | ||
362 | if (atomic_dec_and_lock(&fi->fi_ref, &state_lock)) { | |
363 | hlist_del_rcu(&fi->fi_hash); | |
364 | spin_unlock(&state_lock); | |
365 | WARN_ON_ONCE(!list_empty(&fi->fi_clnt_odstate)); | |
366 | WARN_ON_ONCE(!list_empty(&fi->fi_delegations)); | |
367 | call_rcu(&fi->fi_rcu, nfsd4_free_file_rcu); | |
368 | } | |
369 | } | |
370 | ||
371 | static struct file * | |
372 | __nfs4_get_fd(struct nfs4_file *f, int oflag) | |
373 | { | |
374 | if (f->fi_fds[oflag]) | |
375 | return get_file(f->fi_fds[oflag]); | |
376 | return NULL; | |
377 | } | |
378 | ||
379 | static struct file * | |
380 | find_writeable_file_locked(struct nfs4_file *f) | |
381 | { | |
382 | struct file *ret; | |
383 | ||
384 | lockdep_assert_held(&f->fi_lock); | |
385 | ||
386 | ret = __nfs4_get_fd(f, O_WRONLY); | |
387 | if (!ret) | |
388 | ret = __nfs4_get_fd(f, O_RDWR); | |
389 | return ret; | |
390 | } | |
391 | ||
392 | static struct file * | |
393 | find_writeable_file(struct nfs4_file *f) | |
394 | { | |
395 | struct file *ret; | |
396 | ||
397 | spin_lock(&f->fi_lock); | |
398 | ret = find_writeable_file_locked(f); | |
399 | spin_unlock(&f->fi_lock); | |
400 | ||
401 | return ret; | |
402 | } | |
403 | ||
404 | static struct file *find_readable_file_locked(struct nfs4_file *f) | |
405 | { | |
406 | struct file *ret; | |
407 | ||
408 | lockdep_assert_held(&f->fi_lock); | |
409 | ||
410 | ret = __nfs4_get_fd(f, O_RDONLY); | |
411 | if (!ret) | |
412 | ret = __nfs4_get_fd(f, O_RDWR); | |
413 | return ret; | |
414 | } | |
415 | ||
416 | static struct file * | |
417 | find_readable_file(struct nfs4_file *f) | |
418 | { | |
419 | struct file *ret; | |
420 | ||
421 | spin_lock(&f->fi_lock); | |
422 | ret = find_readable_file_locked(f); | |
423 | spin_unlock(&f->fi_lock); | |
424 | ||
425 | return ret; | |
426 | } | |
427 | ||
428 | struct file * | |
429 | find_any_file(struct nfs4_file *f) | |
430 | { | |
431 | struct file *ret; | |
432 | ||
433 | spin_lock(&f->fi_lock); | |
434 | ret = __nfs4_get_fd(f, O_RDWR); | |
435 | if (!ret) { | |
436 | ret = __nfs4_get_fd(f, O_WRONLY); | |
437 | if (!ret) | |
438 | ret = __nfs4_get_fd(f, O_RDONLY); | |
439 | } | |
440 | spin_unlock(&f->fi_lock); | |
441 | return ret; | |
442 | } | |
443 | ||
444 | static atomic_long_t num_delegations; | |
445 | unsigned long max_delegations; | |
446 | ||
447 | /* | |
448 | * Open owner state (share locks) | |
449 | */ | |
450 | ||
451 | /* hash tables for lock and open owners */ | |
452 | #define OWNER_HASH_BITS 8 | |
453 | #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS) | |
454 | #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1) | |
455 | ||
456 | static unsigned int ownerstr_hashval(struct xdr_netobj *ownername) | |
457 | { | |
458 | unsigned int ret; | |
459 | ||
460 | ret = opaque_hashval(ownername->data, ownername->len); | |
461 | return ret & OWNER_HASH_MASK; | |
462 | } | |
463 | ||
464 | /* hash table for nfs4_file */ | |
465 | #define FILE_HASH_BITS 8 | |
466 | #define FILE_HASH_SIZE (1 << FILE_HASH_BITS) | |
467 | ||
468 | static unsigned int nfsd_fh_hashval(struct knfsd_fh *fh) | |
469 | { | |
470 | return jhash2(fh->fh_base.fh_pad, XDR_QUADLEN(fh->fh_size), 0); | |
471 | } | |
472 | ||
473 | static unsigned int file_hashval(struct knfsd_fh *fh) | |
474 | { | |
475 | return nfsd_fh_hashval(fh) & (FILE_HASH_SIZE - 1); | |
476 | } | |
477 | ||
478 | static struct hlist_head file_hashtbl[FILE_HASH_SIZE]; | |
479 | ||
480 | static void | |
481 | __nfs4_file_get_access(struct nfs4_file *fp, u32 access) | |
482 | { | |
483 | lockdep_assert_held(&fp->fi_lock); | |
484 | ||
485 | if (access & NFS4_SHARE_ACCESS_WRITE) | |
486 | atomic_inc(&fp->fi_access[O_WRONLY]); | |
487 | if (access & NFS4_SHARE_ACCESS_READ) | |
488 | atomic_inc(&fp->fi_access[O_RDONLY]); | |
489 | } | |
490 | ||
491 | static __be32 | |
492 | nfs4_file_get_access(struct nfs4_file *fp, u32 access) | |
493 | { | |
494 | lockdep_assert_held(&fp->fi_lock); | |
495 | ||
496 | /* Does this access mode make sense? */ | |
497 | if (access & ~NFS4_SHARE_ACCESS_BOTH) | |
498 | return nfserr_inval; | |
499 | ||
500 | /* Does it conflict with a deny mode already set? */ | |
501 | if ((access & fp->fi_share_deny) != 0) | |
502 | return nfserr_share_denied; | |
503 | ||
504 | __nfs4_file_get_access(fp, access); | |
505 | return nfs_ok; | |
506 | } | |
507 | ||
508 | static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny) | |
509 | { | |
510 | /* Common case is that there is no deny mode. */ | |
511 | if (deny) { | |
512 | /* Does this deny mode make sense? */ | |
513 | if (deny & ~NFS4_SHARE_DENY_BOTH) | |
514 | return nfserr_inval; | |
515 | ||
516 | if ((deny & NFS4_SHARE_DENY_READ) && | |
517 | atomic_read(&fp->fi_access[O_RDONLY])) | |
518 | return nfserr_share_denied; | |
519 | ||
520 | if ((deny & NFS4_SHARE_DENY_WRITE) && | |
521 | atomic_read(&fp->fi_access[O_WRONLY])) | |
522 | return nfserr_share_denied; | |
523 | } | |
524 | return nfs_ok; | |
525 | } | |
526 | ||
527 | static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag) | |
528 | { | |
529 | might_lock(&fp->fi_lock); | |
530 | ||
531 | if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) { | |
532 | struct file *f1 = NULL; | |
533 | struct file *f2 = NULL; | |
534 | ||
535 | swap(f1, fp->fi_fds[oflag]); | |
536 | if (atomic_read(&fp->fi_access[1 - oflag]) == 0) | |
537 | swap(f2, fp->fi_fds[O_RDWR]); | |
538 | spin_unlock(&fp->fi_lock); | |
539 | if (f1) | |
540 | fput(f1); | |
541 | if (f2) | |
542 | fput(f2); | |
543 | } | |
544 | } | |
545 | ||
546 | static void nfs4_file_put_access(struct nfs4_file *fp, u32 access) | |
547 | { | |
548 | WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH); | |
549 | ||
550 | if (access & NFS4_SHARE_ACCESS_WRITE) | |
551 | __nfs4_file_put_access(fp, O_WRONLY); | |
552 | if (access & NFS4_SHARE_ACCESS_READ) | |
553 | __nfs4_file_put_access(fp, O_RDONLY); | |
554 | } | |
555 | ||
556 | /* | |
557 | * Allocate a new open/delegation state counter. This is needed for | |
558 | * pNFS for proper return on close semantics. | |
559 | * | |
560 | * Note that we only allocate it for pNFS-enabled exports, otherwise | |
561 | * all pointers to struct nfs4_clnt_odstate are always NULL. | |
562 | */ | |
563 | static struct nfs4_clnt_odstate * | |
564 | alloc_clnt_odstate(struct nfs4_client *clp) | |
565 | { | |
566 | struct nfs4_clnt_odstate *co; | |
567 | ||
568 | co = kmem_cache_zalloc(odstate_slab, GFP_KERNEL); | |
569 | if (co) { | |
570 | co->co_client = clp; | |
571 | atomic_set(&co->co_odcount, 1); | |
572 | } | |
573 | return co; | |
574 | } | |
575 | ||
576 | static void | |
577 | hash_clnt_odstate_locked(struct nfs4_clnt_odstate *co) | |
578 | { | |
579 | struct nfs4_file *fp = co->co_file; | |
580 | ||
581 | lockdep_assert_held(&fp->fi_lock); | |
582 | list_add(&co->co_perfile, &fp->fi_clnt_odstate); | |
583 | } | |
584 | ||
585 | static inline void | |
586 | get_clnt_odstate(struct nfs4_clnt_odstate *co) | |
587 | { | |
588 | if (co) | |
589 | atomic_inc(&co->co_odcount); | |
590 | } | |
591 | ||
592 | static void | |
593 | put_clnt_odstate(struct nfs4_clnt_odstate *co) | |
594 | { | |
595 | struct nfs4_file *fp; | |
596 | ||
597 | if (!co) | |
598 | return; | |
599 | ||
600 | fp = co->co_file; | |
601 | if (atomic_dec_and_lock(&co->co_odcount, &fp->fi_lock)) { | |
602 | list_del(&co->co_perfile); | |
603 | spin_unlock(&fp->fi_lock); | |
604 | ||
605 | nfsd4_return_all_file_layouts(co->co_client, fp); | |
606 | kmem_cache_free(odstate_slab, co); | |
607 | } | |
608 | } | |
609 | ||
610 | static struct nfs4_clnt_odstate * | |
611 | find_or_hash_clnt_odstate(struct nfs4_file *fp, struct nfs4_clnt_odstate *new) | |
612 | { | |
613 | struct nfs4_clnt_odstate *co; | |
614 | struct nfs4_client *cl; | |
615 | ||
616 | if (!new) | |
617 | return NULL; | |
618 | ||
619 | cl = new->co_client; | |
620 | ||
621 | spin_lock(&fp->fi_lock); | |
622 | list_for_each_entry(co, &fp->fi_clnt_odstate, co_perfile) { | |
623 | if (co->co_client == cl) { | |
624 | get_clnt_odstate(co); | |
625 | goto out; | |
626 | } | |
627 | } | |
628 | co = new; | |
629 | co->co_file = fp; | |
630 | hash_clnt_odstate_locked(new); | |
631 | out: | |
632 | spin_unlock(&fp->fi_lock); | |
633 | return co; | |
634 | } | |
635 | ||
636 | struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab, | |
637 | void (*sc_free)(struct nfs4_stid *)) | |
638 | { | |
639 | struct nfs4_stid *stid; | |
640 | int new_id; | |
641 | ||
642 | stid = kmem_cache_zalloc(slab, GFP_KERNEL); | |
643 | if (!stid) | |
644 | return NULL; | |
645 | ||
646 | idr_preload(GFP_KERNEL); | |
647 | spin_lock(&cl->cl_lock); | |
648 | new_id = idr_alloc_cyclic(&cl->cl_stateids, stid, 0, 0, GFP_NOWAIT); | |
649 | spin_unlock(&cl->cl_lock); | |
650 | idr_preload_end(); | |
651 | if (new_id < 0) | |
652 | goto out_free; | |
653 | ||
654 | stid->sc_free = sc_free; | |
655 | stid->sc_client = cl; | |
656 | stid->sc_stateid.si_opaque.so_id = new_id; | |
657 | stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid; | |
658 | /* Will be incremented before return to client: */ | |
659 | atomic_set(&stid->sc_count, 1); | |
660 | spin_lock_init(&stid->sc_lock); | |
661 | ||
662 | /* | |
663 | * It shouldn't be a problem to reuse an opaque stateid value. | |
664 | * I don't think it is for 4.1. But with 4.0 I worry that, for | |
665 | * example, a stray write retransmission could be accepted by | |
666 | * the server when it should have been rejected. Therefore, | |
667 | * adopt a trick from the sctp code to attempt to maximize the | |
668 | * amount of time until an id is reused, by ensuring they always | |
669 | * "increase" (mod INT_MAX): | |
670 | */ | |
671 | return stid; | |
672 | out_free: | |
673 | kmem_cache_free(slab, stid); | |
674 | return NULL; | |
675 | } | |
676 | ||
677 | static struct nfs4_ol_stateid * nfs4_alloc_open_stateid(struct nfs4_client *clp) | |
678 | { | |
679 | struct nfs4_stid *stid; | |
680 | ||
681 | stid = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_ol_stateid); | |
682 | if (!stid) | |
683 | return NULL; | |
684 | ||
685 | return openlockstateid(stid); | |
686 | } | |
687 | ||
688 | static void nfs4_free_deleg(struct nfs4_stid *stid) | |
689 | { | |
690 | kmem_cache_free(deleg_slab, stid); | |
691 | atomic_long_dec(&num_delegations); | |
692 | } | |
693 | ||
694 | /* | |
695 | * When we recall a delegation, we should be careful not to hand it | |
696 | * out again straight away. | |
697 | * To ensure this we keep a pair of bloom filters ('new' and 'old') | |
698 | * in which the filehandles of recalled delegations are "stored". | |
699 | * If a filehandle appear in either filter, a delegation is blocked. | |
700 | * When a delegation is recalled, the filehandle is stored in the "new" | |
701 | * filter. | |
702 | * Every 30 seconds we swap the filters and clear the "new" one, | |
703 | * unless both are empty of course. | |
704 | * | |
705 | * Each filter is 256 bits. We hash the filehandle to 32bit and use the | |
706 | * low 3 bytes as hash-table indices. | |
707 | * | |
708 | * 'blocked_delegations_lock', which is always taken in block_delegations(), | |
709 | * is used to manage concurrent access. Testing does not need the lock | |
710 | * except when swapping the two filters. | |
711 | */ | |
712 | static DEFINE_SPINLOCK(blocked_delegations_lock); | |
713 | static struct bloom_pair { | |
714 | int entries, old_entries; | |
715 | time_t swap_time; | |
716 | int new; /* index into 'set' */ | |
717 | DECLARE_BITMAP(set[2], 256); | |
718 | } blocked_delegations; | |
719 | ||
720 | static int delegation_blocked(struct knfsd_fh *fh) | |
721 | { | |
722 | u32 hash; | |
723 | struct bloom_pair *bd = &blocked_delegations; | |
724 | ||
725 | if (bd->entries == 0) | |
726 | return 0; | |
727 | if (seconds_since_boot() - bd->swap_time > 30) { | |
728 | spin_lock(&blocked_delegations_lock); | |
729 | if (seconds_since_boot() - bd->swap_time > 30) { | |
730 | bd->entries -= bd->old_entries; | |
731 | bd->old_entries = bd->entries; | |
732 | memset(bd->set[bd->new], 0, | |
733 | sizeof(bd->set[0])); | |
734 | bd->new = 1-bd->new; | |
735 | bd->swap_time = seconds_since_boot(); | |
736 | } | |
737 | spin_unlock(&blocked_delegations_lock); | |
738 | } | |
739 | hash = jhash(&fh->fh_base, fh->fh_size, 0); | |
740 | if (test_bit(hash&255, bd->set[0]) && | |
741 | test_bit((hash>>8)&255, bd->set[0]) && | |
742 | test_bit((hash>>16)&255, bd->set[0])) | |
743 | return 1; | |
744 | ||
745 | if (test_bit(hash&255, bd->set[1]) && | |
746 | test_bit((hash>>8)&255, bd->set[1]) && | |
747 | test_bit((hash>>16)&255, bd->set[1])) | |
748 | return 1; | |
749 | ||
750 | return 0; | |
751 | } | |
752 | ||
753 | static void block_delegations(struct knfsd_fh *fh) | |
754 | { | |
755 | u32 hash; | |
756 | struct bloom_pair *bd = &blocked_delegations; | |
757 | ||
758 | hash = jhash(&fh->fh_base, fh->fh_size, 0); | |
759 | ||
760 | spin_lock(&blocked_delegations_lock); | |
761 | __set_bit(hash&255, bd->set[bd->new]); | |
762 | __set_bit((hash>>8)&255, bd->set[bd->new]); | |
763 | __set_bit((hash>>16)&255, bd->set[bd->new]); | |
764 | if (bd->entries == 0) | |
765 | bd->swap_time = seconds_since_boot(); | |
766 | bd->entries += 1; | |
767 | spin_unlock(&blocked_delegations_lock); | |
768 | } | |
769 | ||
770 | static struct nfs4_delegation * | |
771 | alloc_init_deleg(struct nfs4_client *clp, struct svc_fh *current_fh, | |
772 | struct nfs4_clnt_odstate *odstate) | |
773 | { | |
774 | struct nfs4_delegation *dp; | |
775 | long n; | |
776 | ||
777 | dprintk("NFSD alloc_init_deleg\n"); | |
778 | n = atomic_long_inc_return(&num_delegations); | |
779 | if (n < 0 || n > max_delegations) | |
780 | goto out_dec; | |
781 | if (delegation_blocked(¤t_fh->fh_handle)) | |
782 | goto out_dec; | |
783 | dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab, nfs4_free_deleg)); | |
784 | if (dp == NULL) | |
785 | goto out_dec; | |
786 | ||
787 | /* | |
788 | * delegation seqid's are never incremented. The 4.1 special | |
789 | * meaning of seqid 0 isn't meaningful, really, but let's avoid | |
790 | * 0 anyway just for consistency and use 1: | |
791 | */ | |
792 | dp->dl_stid.sc_stateid.si_generation = 1; | |
793 | INIT_LIST_HEAD(&dp->dl_perfile); | |
794 | INIT_LIST_HEAD(&dp->dl_perclnt); | |
795 | INIT_LIST_HEAD(&dp->dl_recall_lru); | |
796 | dp->dl_clnt_odstate = odstate; | |
797 | get_clnt_odstate(odstate); | |
798 | dp->dl_type = NFS4_OPEN_DELEGATE_READ; | |
799 | dp->dl_retries = 1; | |
800 | nfsd4_init_cb(&dp->dl_recall, dp->dl_stid.sc_client, | |
801 | &nfsd4_cb_recall_ops, NFSPROC4_CLNT_CB_RECALL); | |
802 | return dp; | |
803 | out_dec: | |
804 | atomic_long_dec(&num_delegations); | |
805 | return NULL; | |
806 | } | |
807 | ||
808 | void | |
809 | nfs4_put_stid(struct nfs4_stid *s) | |
810 | { | |
811 | struct nfs4_file *fp = s->sc_file; | |
812 | struct nfs4_client *clp = s->sc_client; | |
813 | ||
814 | might_lock(&clp->cl_lock); | |
815 | ||
816 | if (!atomic_dec_and_lock(&s->sc_count, &clp->cl_lock)) { | |
817 | wake_up_all(&close_wq); | |
818 | return; | |
819 | } | |
820 | idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id); | |
821 | spin_unlock(&clp->cl_lock); | |
822 | s->sc_free(s); | |
823 | if (fp) | |
824 | put_nfs4_file(fp); | |
825 | } | |
826 | ||
827 | void | |
828 | nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid) | |
829 | { | |
830 | stateid_t *src = &stid->sc_stateid; | |
831 | ||
832 | spin_lock(&stid->sc_lock); | |
833 | if (unlikely(++src->si_generation == 0)) | |
834 | src->si_generation = 1; | |
835 | memcpy(dst, src, sizeof(*dst)); | |
836 | spin_unlock(&stid->sc_lock); | |
837 | } | |
838 | ||
839 | static void nfs4_put_deleg_lease(struct nfs4_file *fp) | |
840 | { | |
841 | struct file *filp = NULL; | |
842 | ||
843 | spin_lock(&fp->fi_lock); | |
844 | if (fp->fi_deleg_file && --fp->fi_delegees == 0) | |
845 | swap(filp, fp->fi_deleg_file); | |
846 | spin_unlock(&fp->fi_lock); | |
847 | ||
848 | if (filp) { | |
849 | vfs_setlease(filp, F_UNLCK, NULL, (void **)&fp); | |
850 | fput(filp); | |
851 | } | |
852 | } | |
853 | ||
854 | void nfs4_unhash_stid(struct nfs4_stid *s) | |
855 | { | |
856 | s->sc_type = 0; | |
857 | } | |
858 | ||
859 | /** | |
860 | * nfs4_get_existing_delegation - Discover if this delegation already exists | |
861 | * @clp: a pointer to the nfs4_client we're granting a delegation to | |
862 | * @fp: a pointer to the nfs4_file we're granting a delegation on | |
863 | * | |
864 | * Return: | |
865 | * On success: NULL if an existing delegation was not found. | |
866 | * | |
867 | * On error: -EAGAIN if one was previously granted to this nfs4_client | |
868 | * for this nfs4_file. | |
869 | * | |
870 | */ | |
871 | ||
872 | static int | |
873 | nfs4_get_existing_delegation(struct nfs4_client *clp, struct nfs4_file *fp) | |
874 | { | |
875 | struct nfs4_delegation *searchdp = NULL; | |
876 | struct nfs4_client *searchclp = NULL; | |
877 | ||
878 | lockdep_assert_held(&state_lock); | |
879 | lockdep_assert_held(&fp->fi_lock); | |
880 | ||
881 | list_for_each_entry(searchdp, &fp->fi_delegations, dl_perfile) { | |
882 | searchclp = searchdp->dl_stid.sc_client; | |
883 | if (clp == searchclp) { | |
884 | return -EAGAIN; | |
885 | } | |
886 | } | |
887 | return 0; | |
888 | } | |
889 | ||
890 | /** | |
891 | * hash_delegation_locked - Add a delegation to the appropriate lists | |
892 | * @dp: a pointer to the nfs4_delegation we are adding. | |
893 | * @fp: a pointer to the nfs4_file we're granting a delegation on | |
894 | * | |
895 | * Return: | |
896 | * On success: NULL if the delegation was successfully hashed. | |
897 | * | |
898 | * On error: -EAGAIN if one was previously granted to this | |
899 | * nfs4_client for this nfs4_file. Delegation is not hashed. | |
900 | * | |
901 | */ | |
902 | ||
903 | static int | |
904 | hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp) | |
905 | { | |
906 | int status; | |
907 | struct nfs4_client *clp = dp->dl_stid.sc_client; | |
908 | ||
909 | lockdep_assert_held(&state_lock); | |
910 | lockdep_assert_held(&fp->fi_lock); | |
911 | ||
912 | status = nfs4_get_existing_delegation(clp, fp); | |
913 | if (status) | |
914 | return status; | |
915 | ++fp->fi_delegees; | |
916 | atomic_inc(&dp->dl_stid.sc_count); | |
917 | dp->dl_stid.sc_type = NFS4_DELEG_STID; | |
918 | list_add(&dp->dl_perfile, &fp->fi_delegations); | |
919 | list_add(&dp->dl_perclnt, &clp->cl_delegations); | |
920 | return 0; | |
921 | } | |
922 | ||
923 | static bool | |
924 | unhash_delegation_locked(struct nfs4_delegation *dp) | |
925 | { | |
926 | struct nfs4_file *fp = dp->dl_stid.sc_file; | |
927 | ||
928 | lockdep_assert_held(&state_lock); | |
929 | ||
930 | if (list_empty(&dp->dl_perfile)) | |
931 | return false; | |
932 | ||
933 | dp->dl_stid.sc_type = NFS4_CLOSED_DELEG_STID; | |
934 | /* Ensure that deleg break won't try to requeue it */ | |
935 | ++dp->dl_time; | |
936 | spin_lock(&fp->fi_lock); | |
937 | list_del_init(&dp->dl_perclnt); | |
938 | list_del_init(&dp->dl_recall_lru); | |
939 | list_del_init(&dp->dl_perfile); | |
940 | spin_unlock(&fp->fi_lock); | |
941 | return true; | |
942 | } | |
943 | ||
944 | static void destroy_delegation(struct nfs4_delegation *dp) | |
945 | { | |
946 | bool unhashed; | |
947 | ||
948 | spin_lock(&state_lock); | |
949 | unhashed = unhash_delegation_locked(dp); | |
950 | spin_unlock(&state_lock); | |
951 | if (unhashed) { | |
952 | put_clnt_odstate(dp->dl_clnt_odstate); | |
953 | nfs4_put_deleg_lease(dp->dl_stid.sc_file); | |
954 | nfs4_put_stid(&dp->dl_stid); | |
955 | } | |
956 | } | |
957 | ||
958 | static void revoke_delegation(struct nfs4_delegation *dp) | |
959 | { | |
960 | struct nfs4_client *clp = dp->dl_stid.sc_client; | |
961 | ||
962 | WARN_ON(!list_empty(&dp->dl_recall_lru)); | |
963 | ||
964 | put_clnt_odstate(dp->dl_clnt_odstate); | |
965 | nfs4_put_deleg_lease(dp->dl_stid.sc_file); | |
966 | ||
967 | if (clp->cl_minorversion == 0) | |
968 | nfs4_put_stid(&dp->dl_stid); | |
969 | else { | |
970 | dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID; | |
971 | spin_lock(&clp->cl_lock); | |
972 | list_add(&dp->dl_recall_lru, &clp->cl_revoked); | |
973 | spin_unlock(&clp->cl_lock); | |
974 | } | |
975 | } | |
976 | ||
977 | /* | |
978 | * SETCLIENTID state | |
979 | */ | |
980 | ||
981 | static unsigned int clientid_hashval(u32 id) | |
982 | { | |
983 | return id & CLIENT_HASH_MASK; | |
984 | } | |
985 | ||
986 | static unsigned int clientstr_hashval(const char *name) | |
987 | { | |
988 | return opaque_hashval(name, 8) & CLIENT_HASH_MASK; | |
989 | } | |
990 | ||
991 | /* | |
992 | * We store the NONE, READ, WRITE, and BOTH bits separately in the | |
993 | * st_{access,deny}_bmap field of the stateid, in order to track not | |
994 | * only what share bits are currently in force, but also what | |
995 | * combinations of share bits previous opens have used. This allows us | |
996 | * to enforce the recommendation of rfc 3530 14.2.19 that the server | |
997 | * return an error if the client attempt to downgrade to a combination | |
998 | * of share bits not explicable by closing some of its previous opens. | |
999 | * | |
1000 | * XXX: This enforcement is actually incomplete, since we don't keep | |
1001 | * track of access/deny bit combinations; so, e.g., we allow: | |
1002 | * | |
1003 | * OPEN allow read, deny write | |
1004 | * OPEN allow both, deny none | |
1005 | * DOWNGRADE allow read, deny none | |
1006 | * | |
1007 | * which we should reject. | |
1008 | */ | |
1009 | static unsigned int | |
1010 | bmap_to_share_mode(unsigned long bmap) { | |
1011 | int i; | |
1012 | unsigned int access = 0; | |
1013 | ||
1014 | for (i = 1; i < 4; i++) { | |
1015 | if (test_bit(i, &bmap)) | |
1016 | access |= i; | |
1017 | } | |
1018 | return access; | |
1019 | } | |
1020 | ||
1021 | /* set share access for a given stateid */ | |
1022 | static inline void | |
1023 | set_access(u32 access, struct nfs4_ol_stateid *stp) | |
1024 | { | |
1025 | unsigned char mask = 1 << access; | |
1026 | ||
1027 | WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH); | |
1028 | stp->st_access_bmap |= mask; | |
1029 | } | |
1030 | ||
1031 | /* clear share access for a given stateid */ | |
1032 | static inline void | |
1033 | clear_access(u32 access, struct nfs4_ol_stateid *stp) | |
1034 | { | |
1035 | unsigned char mask = 1 << access; | |
1036 | ||
1037 | WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH); | |
1038 | stp->st_access_bmap &= ~mask; | |
1039 | } | |
1040 | ||
1041 | /* test whether a given stateid has access */ | |
1042 | static inline bool | |
1043 | test_access(u32 access, struct nfs4_ol_stateid *stp) | |
1044 | { | |
1045 | unsigned char mask = 1 << access; | |
1046 | ||
1047 | return (bool)(stp->st_access_bmap & mask); | |
1048 | } | |
1049 | ||
1050 | /* set share deny for a given stateid */ | |
1051 | static inline void | |
1052 | set_deny(u32 deny, struct nfs4_ol_stateid *stp) | |
1053 | { | |
1054 | unsigned char mask = 1 << deny; | |
1055 | ||
1056 | WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH); | |
1057 | stp->st_deny_bmap |= mask; | |
1058 | } | |
1059 | ||
1060 | /* clear share deny for a given stateid */ | |
1061 | static inline void | |
1062 | clear_deny(u32 deny, struct nfs4_ol_stateid *stp) | |
1063 | { | |
1064 | unsigned char mask = 1 << deny; | |
1065 | ||
1066 | WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH); | |
1067 | stp->st_deny_bmap &= ~mask; | |
1068 | } | |
1069 | ||
1070 | /* test whether a given stateid is denying specific access */ | |
1071 | static inline bool | |
1072 | test_deny(u32 deny, struct nfs4_ol_stateid *stp) | |
1073 | { | |
1074 | unsigned char mask = 1 << deny; | |
1075 | ||
1076 | return (bool)(stp->st_deny_bmap & mask); | |
1077 | } | |
1078 | ||
1079 | static int nfs4_access_to_omode(u32 access) | |
1080 | { | |
1081 | switch (access & NFS4_SHARE_ACCESS_BOTH) { | |
1082 | case NFS4_SHARE_ACCESS_READ: | |
1083 | return O_RDONLY; | |
1084 | case NFS4_SHARE_ACCESS_WRITE: | |
1085 | return O_WRONLY; | |
1086 | case NFS4_SHARE_ACCESS_BOTH: | |
1087 | return O_RDWR; | |
1088 | } | |
1089 | WARN_ON_ONCE(1); | |
1090 | return O_RDONLY; | |
1091 | } | |
1092 | ||
1093 | /* | |
1094 | * A stateid that had a deny mode associated with it is being released | |
1095 | * or downgraded. Recalculate the deny mode on the file. | |
1096 | */ | |
1097 | static void | |
1098 | recalculate_deny_mode(struct nfs4_file *fp) | |
1099 | { | |
1100 | struct nfs4_ol_stateid *stp; | |
1101 | ||
1102 | spin_lock(&fp->fi_lock); | |
1103 | fp->fi_share_deny = 0; | |
1104 | list_for_each_entry(stp, &fp->fi_stateids, st_perfile) | |
1105 | fp->fi_share_deny |= bmap_to_share_mode(stp->st_deny_bmap); | |
1106 | spin_unlock(&fp->fi_lock); | |
1107 | } | |
1108 | ||
1109 | static void | |
1110 | reset_union_bmap_deny(u32 deny, struct nfs4_ol_stateid *stp) | |
1111 | { | |
1112 | int i; | |
1113 | bool change = false; | |
1114 | ||
1115 | for (i = 1; i < 4; i++) { | |
1116 | if ((i & deny) != i) { | |
1117 | change = true; | |
1118 | clear_deny(i, stp); | |
1119 | } | |
1120 | } | |
1121 | ||
1122 | /* Recalculate per-file deny mode if there was a change */ | |
1123 | if (change) | |
1124 | recalculate_deny_mode(stp->st_stid.sc_file); | |
1125 | } | |
1126 | ||
1127 | /* release all access and file references for a given stateid */ | |
1128 | static void | |
1129 | release_all_access(struct nfs4_ol_stateid *stp) | |
1130 | { | |
1131 | int i; | |
1132 | struct nfs4_file *fp = stp->st_stid.sc_file; | |
1133 | ||
1134 | if (fp && stp->st_deny_bmap != 0) | |
1135 | recalculate_deny_mode(fp); | |
1136 | ||
1137 | for (i = 1; i < 4; i++) { | |
1138 | if (test_access(i, stp)) | |
1139 | nfs4_file_put_access(stp->st_stid.sc_file, i); | |
1140 | clear_access(i, stp); | |
1141 | } | |
1142 | } | |
1143 | ||
1144 | static inline void nfs4_free_stateowner(struct nfs4_stateowner *sop) | |
1145 | { | |
1146 | kfree(sop->so_owner.data); | |
1147 | sop->so_ops->so_free(sop); | |
1148 | } | |
1149 | ||
1150 | static void nfs4_put_stateowner(struct nfs4_stateowner *sop) | |
1151 | { | |
1152 | struct nfs4_client *clp = sop->so_client; | |
1153 | ||
1154 | might_lock(&clp->cl_lock); | |
1155 | ||
1156 | if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock)) | |
1157 | return; | |
1158 | sop->so_ops->so_unhash(sop); | |
1159 | spin_unlock(&clp->cl_lock); | |
1160 | nfs4_free_stateowner(sop); | |
1161 | } | |
1162 | ||
1163 | static bool unhash_ol_stateid(struct nfs4_ol_stateid *stp) | |
1164 | { | |
1165 | struct nfs4_file *fp = stp->st_stid.sc_file; | |
1166 | ||
1167 | lockdep_assert_held(&stp->st_stateowner->so_client->cl_lock); | |
1168 | ||
1169 | if (list_empty(&stp->st_perfile)) | |
1170 | return false; | |
1171 | ||
1172 | spin_lock(&fp->fi_lock); | |
1173 | list_del_init(&stp->st_perfile); | |
1174 | spin_unlock(&fp->fi_lock); | |
1175 | list_del(&stp->st_perstateowner); | |
1176 | return true; | |
1177 | } | |
1178 | ||
1179 | static void nfs4_free_ol_stateid(struct nfs4_stid *stid) | |
1180 | { | |
1181 | struct nfs4_ol_stateid *stp = openlockstateid(stid); | |
1182 | ||
1183 | put_clnt_odstate(stp->st_clnt_odstate); | |
1184 | release_all_access(stp); | |
1185 | if (stp->st_stateowner) | |
1186 | nfs4_put_stateowner(stp->st_stateowner); | |
1187 | kmem_cache_free(stateid_slab, stid); | |
1188 | } | |
1189 | ||
1190 | static void nfs4_free_lock_stateid(struct nfs4_stid *stid) | |
1191 | { | |
1192 | struct nfs4_ol_stateid *stp = openlockstateid(stid); | |
1193 | struct nfs4_lockowner *lo = lockowner(stp->st_stateowner); | |
1194 | struct file *file; | |
1195 | ||
1196 | file = find_any_file(stp->st_stid.sc_file); | |
1197 | if (file) | |
1198 | filp_close(file, (fl_owner_t)lo); | |
1199 | nfs4_free_ol_stateid(stid); | |
1200 | } | |
1201 | ||
1202 | /* | |
1203 | * Put the persistent reference to an already unhashed generic stateid, while | |
1204 | * holding the cl_lock. If it's the last reference, then put it onto the | |
1205 | * reaplist for later destruction. | |
1206 | */ | |
1207 | static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp, | |
1208 | struct list_head *reaplist) | |
1209 | { | |
1210 | struct nfs4_stid *s = &stp->st_stid; | |
1211 | struct nfs4_client *clp = s->sc_client; | |
1212 | ||
1213 | lockdep_assert_held(&clp->cl_lock); | |
1214 | ||
1215 | WARN_ON_ONCE(!list_empty(&stp->st_locks)); | |
1216 | ||
1217 | if (!atomic_dec_and_test(&s->sc_count)) { | |
1218 | wake_up_all(&close_wq); | |
1219 | return; | |
1220 | } | |
1221 | ||
1222 | idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id); | |
1223 | list_add(&stp->st_locks, reaplist); | |
1224 | } | |
1225 | ||
1226 | static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp) | |
1227 | { | |
1228 | lockdep_assert_held(&stp->st_stid.sc_client->cl_lock); | |
1229 | ||
1230 | list_del_init(&stp->st_locks); | |
1231 | nfs4_unhash_stid(&stp->st_stid); | |
1232 | return unhash_ol_stateid(stp); | |
1233 | } | |
1234 | ||
1235 | static void release_lock_stateid(struct nfs4_ol_stateid *stp) | |
1236 | { | |
1237 | struct nfs4_client *clp = stp->st_stid.sc_client; | |
1238 | bool unhashed; | |
1239 | ||
1240 | spin_lock(&clp->cl_lock); | |
1241 | unhashed = unhash_lock_stateid(stp); | |
1242 | spin_unlock(&clp->cl_lock); | |
1243 | if (unhashed) | |
1244 | nfs4_put_stid(&stp->st_stid); | |
1245 | } | |
1246 | ||
1247 | static void unhash_lockowner_locked(struct nfs4_lockowner *lo) | |
1248 | { | |
1249 | struct nfs4_client *clp = lo->lo_owner.so_client; | |
1250 | ||
1251 | lockdep_assert_held(&clp->cl_lock); | |
1252 | ||
1253 | list_del_init(&lo->lo_owner.so_strhash); | |
1254 | } | |
1255 | ||
1256 | /* | |
1257 | * Free a list of generic stateids that were collected earlier after being | |
1258 | * fully unhashed. | |
1259 | */ | |
1260 | static void | |
1261 | free_ol_stateid_reaplist(struct list_head *reaplist) | |
1262 | { | |
1263 | struct nfs4_ol_stateid *stp; | |
1264 | struct nfs4_file *fp; | |
1265 | ||
1266 | might_sleep(); | |
1267 | ||
1268 | while (!list_empty(reaplist)) { | |
1269 | stp = list_first_entry(reaplist, struct nfs4_ol_stateid, | |
1270 | st_locks); | |
1271 | list_del(&stp->st_locks); | |
1272 | fp = stp->st_stid.sc_file; | |
1273 | stp->st_stid.sc_free(&stp->st_stid); | |
1274 | if (fp) | |
1275 | put_nfs4_file(fp); | |
1276 | } | |
1277 | } | |
1278 | ||
1279 | static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp, | |
1280 | struct list_head *reaplist) | |
1281 | { | |
1282 | struct nfs4_ol_stateid *stp; | |
1283 | ||
1284 | lockdep_assert_held(&open_stp->st_stid.sc_client->cl_lock); | |
1285 | ||
1286 | while (!list_empty(&open_stp->st_locks)) { | |
1287 | stp = list_entry(open_stp->st_locks.next, | |
1288 | struct nfs4_ol_stateid, st_locks); | |
1289 | WARN_ON(!unhash_lock_stateid(stp)); | |
1290 | put_ol_stateid_locked(stp, reaplist); | |
1291 | } | |
1292 | } | |
1293 | ||
1294 | static bool unhash_open_stateid(struct nfs4_ol_stateid *stp, | |
1295 | struct list_head *reaplist) | |
1296 | { | |
1297 | bool unhashed; | |
1298 | ||
1299 | lockdep_assert_held(&stp->st_stid.sc_client->cl_lock); | |
1300 | ||
1301 | unhashed = unhash_ol_stateid(stp); | |
1302 | release_open_stateid_locks(stp, reaplist); | |
1303 | return unhashed; | |
1304 | } | |
1305 | ||
1306 | static void release_open_stateid(struct nfs4_ol_stateid *stp) | |
1307 | { | |
1308 | LIST_HEAD(reaplist); | |
1309 | ||
1310 | spin_lock(&stp->st_stid.sc_client->cl_lock); | |
1311 | if (unhash_open_stateid(stp, &reaplist)) | |
1312 | put_ol_stateid_locked(stp, &reaplist); | |
1313 | spin_unlock(&stp->st_stid.sc_client->cl_lock); | |
1314 | free_ol_stateid_reaplist(&reaplist); | |
1315 | } | |
1316 | ||
1317 | static void unhash_openowner_locked(struct nfs4_openowner *oo) | |
1318 | { | |
1319 | struct nfs4_client *clp = oo->oo_owner.so_client; | |
1320 | ||
1321 | lockdep_assert_held(&clp->cl_lock); | |
1322 | ||
1323 | list_del_init(&oo->oo_owner.so_strhash); | |
1324 | list_del_init(&oo->oo_perclient); | |
1325 | } | |
1326 | ||
1327 | static void release_last_closed_stateid(struct nfs4_openowner *oo) | |
1328 | { | |
1329 | struct nfsd_net *nn = net_generic(oo->oo_owner.so_client->net, | |
1330 | nfsd_net_id); | |
1331 | struct nfs4_ol_stateid *s; | |
1332 | ||
1333 | spin_lock(&nn->client_lock); | |
1334 | s = oo->oo_last_closed_stid; | |
1335 | if (s) { | |
1336 | list_del_init(&oo->oo_close_lru); | |
1337 | oo->oo_last_closed_stid = NULL; | |
1338 | } | |
1339 | spin_unlock(&nn->client_lock); | |
1340 | if (s) | |
1341 | nfs4_put_stid(&s->st_stid); | |
1342 | } | |
1343 | ||
1344 | static void release_openowner(struct nfs4_openowner *oo) | |
1345 | { | |
1346 | struct nfs4_ol_stateid *stp; | |
1347 | struct nfs4_client *clp = oo->oo_owner.so_client; | |
1348 | struct list_head reaplist; | |
1349 | ||
1350 | INIT_LIST_HEAD(&reaplist); | |
1351 | ||
1352 | spin_lock(&clp->cl_lock); | |
1353 | unhash_openowner_locked(oo); | |
1354 | while (!list_empty(&oo->oo_owner.so_stateids)) { | |
1355 | stp = list_first_entry(&oo->oo_owner.so_stateids, | |
1356 | struct nfs4_ol_stateid, st_perstateowner); | |
1357 | if (unhash_open_stateid(stp, &reaplist)) | |
1358 | put_ol_stateid_locked(stp, &reaplist); | |
1359 | } | |
1360 | spin_unlock(&clp->cl_lock); | |
1361 | free_ol_stateid_reaplist(&reaplist); | |
1362 | release_last_closed_stateid(oo); | |
1363 | nfs4_put_stateowner(&oo->oo_owner); | |
1364 | } | |
1365 | ||
1366 | static inline int | |
1367 | hash_sessionid(struct nfs4_sessionid *sessionid) | |
1368 | { | |
1369 | struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid; | |
1370 | ||
1371 | return sid->sequence % SESSION_HASH_SIZE; | |
1372 | } | |
1373 | ||
1374 | #ifdef CONFIG_SUNRPC_DEBUG | |
1375 | static inline void | |
1376 | dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid) | |
1377 | { | |
1378 | u32 *ptr = (u32 *)(&sessionid->data[0]); | |
1379 | dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]); | |
1380 | } | |
1381 | #else | |
1382 | static inline void | |
1383 | dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid) | |
1384 | { | |
1385 | } | |
1386 | #endif | |
1387 | ||
1388 | /* | |
1389 | * Bump the seqid on cstate->replay_owner, and clear replay_owner if it | |
1390 | * won't be used for replay. | |
1391 | */ | |
1392 | void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr) | |
1393 | { | |
1394 | struct nfs4_stateowner *so = cstate->replay_owner; | |
1395 | ||
1396 | if (nfserr == nfserr_replay_me) | |
1397 | return; | |
1398 | ||
1399 | if (!seqid_mutating_err(ntohl(nfserr))) { | |
1400 | nfsd4_cstate_clear_replay(cstate); | |
1401 | return; | |
1402 | } | |
1403 | if (!so) | |
1404 | return; | |
1405 | if (so->so_is_open_owner) | |
1406 | release_last_closed_stateid(openowner(so)); | |
1407 | so->so_seqid++; | |
1408 | return; | |
1409 | } | |
1410 | ||
1411 | static void | |
1412 | gen_sessionid(struct nfsd4_session *ses) | |
1413 | { | |
1414 | struct nfs4_client *clp = ses->se_client; | |
1415 | struct nfsd4_sessionid *sid; | |
1416 | ||
1417 | sid = (struct nfsd4_sessionid *)ses->se_sessionid.data; | |
1418 | sid->clientid = clp->cl_clientid; | |
1419 | sid->sequence = current_sessionid++; | |
1420 | sid->reserved = 0; | |
1421 | } | |
1422 | ||
1423 | /* | |
1424 | * The protocol defines ca_maxresponssize_cached to include the size of | |
1425 | * the rpc header, but all we need to cache is the data starting after | |
1426 | * the end of the initial SEQUENCE operation--the rest we regenerate | |
1427 | * each time. Therefore we can advertise a ca_maxresponssize_cached | |
1428 | * value that is the number of bytes in our cache plus a few additional | |
1429 | * bytes. In order to stay on the safe side, and not promise more than | |
1430 | * we can cache, those additional bytes must be the minimum possible: 24 | |
1431 | * bytes of rpc header (xid through accept state, with AUTH_NULL | |
1432 | * verifier), 12 for the compound header (with zero-length tag), and 44 | |
1433 | * for the SEQUENCE op response: | |
1434 | */ | |
1435 | #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44) | |
1436 | ||
1437 | static void | |
1438 | free_session_slots(struct nfsd4_session *ses) | |
1439 | { | |
1440 | int i; | |
1441 | ||
1442 | for (i = 0; i < ses->se_fchannel.maxreqs; i++) | |
1443 | kfree(ses->se_slots[i]); | |
1444 | } | |
1445 | ||
1446 | /* | |
1447 | * We don't actually need to cache the rpc and session headers, so we | |
1448 | * can allocate a little less for each slot: | |
1449 | */ | |
1450 | static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca) | |
1451 | { | |
1452 | u32 size; | |
1453 | ||
1454 | if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ) | |
1455 | size = 0; | |
1456 | else | |
1457 | size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ; | |
1458 | return size + sizeof(struct nfsd4_slot); | |
1459 | } | |
1460 | ||
1461 | /* | |
1462 | * XXX: If we run out of reserved DRC memory we could (up to a point) | |
1463 | * re-negotiate active sessions and reduce their slot usage to make | |
1464 | * room for new connections. For now we just fail the create session. | |
1465 | */ | |
1466 | static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca) | |
1467 | { | |
1468 | u32 slotsize = slot_bytes(ca); | |
1469 | u32 num = ca->maxreqs; | |
1470 | int avail; | |
1471 | ||
1472 | spin_lock(&nfsd_drc_lock); | |
1473 | avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION, | |
1474 | nfsd_drc_max_mem - nfsd_drc_mem_used); | |
1475 | num = min_t(int, num, avail / slotsize); | |
1476 | nfsd_drc_mem_used += num * slotsize; | |
1477 | spin_unlock(&nfsd_drc_lock); | |
1478 | ||
1479 | return num; | |
1480 | } | |
1481 | ||
1482 | static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca) | |
1483 | { | |
1484 | int slotsize = slot_bytes(ca); | |
1485 | ||
1486 | spin_lock(&nfsd_drc_lock); | |
1487 | nfsd_drc_mem_used -= slotsize * ca->maxreqs; | |
1488 | spin_unlock(&nfsd_drc_lock); | |
1489 | } | |
1490 | ||
1491 | static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs, | |
1492 | struct nfsd4_channel_attrs *battrs) | |
1493 | { | |
1494 | int numslots = fattrs->maxreqs; | |
1495 | int slotsize = slot_bytes(fattrs); | |
1496 | struct nfsd4_session *new; | |
1497 | int mem, i; | |
1498 | ||
1499 | BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *) | |
1500 | + sizeof(struct nfsd4_session) > PAGE_SIZE); | |
1501 | mem = numslots * sizeof(struct nfsd4_slot *); | |
1502 | ||
1503 | new = kzalloc(sizeof(*new) + mem, GFP_KERNEL); | |
1504 | if (!new) | |
1505 | return NULL; | |
1506 | /* allocate each struct nfsd4_slot and data cache in one piece */ | |
1507 | for (i = 0; i < numslots; i++) { | |
1508 | new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL); | |
1509 | if (!new->se_slots[i]) | |
1510 | goto out_free; | |
1511 | } | |
1512 | ||
1513 | memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs)); | |
1514 | memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs)); | |
1515 | ||
1516 | return new; | |
1517 | out_free: | |
1518 | while (i--) | |
1519 | kfree(new->se_slots[i]); | |
1520 | kfree(new); | |
1521 | return NULL; | |
1522 | } | |
1523 | ||
1524 | static void free_conn(struct nfsd4_conn *c) | |
1525 | { | |
1526 | svc_xprt_put(c->cn_xprt); | |
1527 | kfree(c); | |
1528 | } | |
1529 | ||
1530 | static void nfsd4_conn_lost(struct svc_xpt_user *u) | |
1531 | { | |
1532 | struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user); | |
1533 | struct nfs4_client *clp = c->cn_session->se_client; | |
1534 | ||
1535 | spin_lock(&clp->cl_lock); | |
1536 | if (!list_empty(&c->cn_persession)) { | |
1537 | list_del(&c->cn_persession); | |
1538 | free_conn(c); | |
1539 | } | |
1540 | nfsd4_probe_callback(clp); | |
1541 | spin_unlock(&clp->cl_lock); | |
1542 | } | |
1543 | ||
1544 | static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags) | |
1545 | { | |
1546 | struct nfsd4_conn *conn; | |
1547 | ||
1548 | conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL); | |
1549 | if (!conn) | |
1550 | return NULL; | |
1551 | svc_xprt_get(rqstp->rq_xprt); | |
1552 | conn->cn_xprt = rqstp->rq_xprt; | |
1553 | conn->cn_flags = flags; | |
1554 | INIT_LIST_HEAD(&conn->cn_xpt_user.list); | |
1555 | return conn; | |
1556 | } | |
1557 | ||
1558 | static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses) | |
1559 | { | |
1560 | conn->cn_session = ses; | |
1561 | list_add(&conn->cn_persession, &ses->se_conns); | |
1562 | } | |
1563 | ||
1564 | static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses) | |
1565 | { | |
1566 | struct nfs4_client *clp = ses->se_client; | |
1567 | ||
1568 | spin_lock(&clp->cl_lock); | |
1569 | __nfsd4_hash_conn(conn, ses); | |
1570 | spin_unlock(&clp->cl_lock); | |
1571 | } | |
1572 | ||
1573 | static int nfsd4_register_conn(struct nfsd4_conn *conn) | |
1574 | { | |
1575 | conn->cn_xpt_user.callback = nfsd4_conn_lost; | |
1576 | return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user); | |
1577 | } | |
1578 | ||
1579 | static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses) | |
1580 | { | |
1581 | int ret; | |
1582 | ||
1583 | nfsd4_hash_conn(conn, ses); | |
1584 | ret = nfsd4_register_conn(conn); | |
1585 | if (ret) | |
1586 | /* oops; xprt is already down: */ | |
1587 | nfsd4_conn_lost(&conn->cn_xpt_user); | |
1588 | /* We may have gained or lost a callback channel: */ | |
1589 | nfsd4_probe_callback_sync(ses->se_client); | |
1590 | } | |
1591 | ||
1592 | static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses) | |
1593 | { | |
1594 | u32 dir = NFS4_CDFC4_FORE; | |
1595 | ||
1596 | if (cses->flags & SESSION4_BACK_CHAN) | |
1597 | dir |= NFS4_CDFC4_BACK; | |
1598 | return alloc_conn(rqstp, dir); | |
1599 | } | |
1600 | ||
1601 | /* must be called under client_lock */ | |
1602 | static void nfsd4_del_conns(struct nfsd4_session *s) | |
1603 | { | |
1604 | struct nfs4_client *clp = s->se_client; | |
1605 | struct nfsd4_conn *c; | |
1606 | ||
1607 | spin_lock(&clp->cl_lock); | |
1608 | while (!list_empty(&s->se_conns)) { | |
1609 | c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession); | |
1610 | list_del_init(&c->cn_persession); | |
1611 | spin_unlock(&clp->cl_lock); | |
1612 | ||
1613 | unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user); | |
1614 | free_conn(c); | |
1615 | ||
1616 | spin_lock(&clp->cl_lock); | |
1617 | } | |
1618 | spin_unlock(&clp->cl_lock); | |
1619 | } | |
1620 | ||
1621 | static void __free_session(struct nfsd4_session *ses) | |
1622 | { | |
1623 | free_session_slots(ses); | |
1624 | kfree(ses); | |
1625 | } | |
1626 | ||
1627 | static void free_session(struct nfsd4_session *ses) | |
1628 | { | |
1629 | nfsd4_del_conns(ses); | |
1630 | nfsd4_put_drc_mem(&ses->se_fchannel); | |
1631 | __free_session(ses); | |
1632 | } | |
1633 | ||
1634 | static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses) | |
1635 | { | |
1636 | int idx; | |
1637 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
1638 | ||
1639 | new->se_client = clp; | |
1640 | gen_sessionid(new); | |
1641 | ||
1642 | INIT_LIST_HEAD(&new->se_conns); | |
1643 | ||
1644 | new->se_cb_seq_nr = 1; | |
1645 | new->se_flags = cses->flags; | |
1646 | new->se_cb_prog = cses->callback_prog; | |
1647 | new->se_cb_sec = cses->cb_sec; | |
1648 | atomic_set(&new->se_ref, 0); | |
1649 | idx = hash_sessionid(&new->se_sessionid); | |
1650 | list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]); | |
1651 | spin_lock(&clp->cl_lock); | |
1652 | list_add(&new->se_perclnt, &clp->cl_sessions); | |
1653 | spin_unlock(&clp->cl_lock); | |
1654 | ||
1655 | { | |
1656 | struct sockaddr *sa = svc_addr(rqstp); | |
1657 | /* | |
1658 | * This is a little silly; with sessions there's no real | |
1659 | * use for the callback address. Use the peer address | |
1660 | * as a reasonable default for now, but consider fixing | |
1661 | * the rpc client not to require an address in the | |
1662 | * future: | |
1663 | */ | |
1664 | rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa); | |
1665 | clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa); | |
1666 | } | |
1667 | } | |
1668 | ||
1669 | /* caller must hold client_lock */ | |
1670 | static struct nfsd4_session * | |
1671 | __find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net) | |
1672 | { | |
1673 | struct nfsd4_session *elem; | |
1674 | int idx; | |
1675 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
1676 | ||
1677 | lockdep_assert_held(&nn->client_lock); | |
1678 | ||
1679 | dump_sessionid(__func__, sessionid); | |
1680 | idx = hash_sessionid(sessionid); | |
1681 | /* Search in the appropriate list */ | |
1682 | list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) { | |
1683 | if (!memcmp(elem->se_sessionid.data, sessionid->data, | |
1684 | NFS4_MAX_SESSIONID_LEN)) { | |
1685 | return elem; | |
1686 | } | |
1687 | } | |
1688 | ||
1689 | dprintk("%s: session not found\n", __func__); | |
1690 | return NULL; | |
1691 | } | |
1692 | ||
1693 | static struct nfsd4_session * | |
1694 | find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net, | |
1695 | __be32 *ret) | |
1696 | { | |
1697 | struct nfsd4_session *session; | |
1698 | __be32 status = nfserr_badsession; | |
1699 | ||
1700 | session = __find_in_sessionid_hashtbl(sessionid, net); | |
1701 | if (!session) | |
1702 | goto out; | |
1703 | status = nfsd4_get_session_locked(session); | |
1704 | if (status) | |
1705 | session = NULL; | |
1706 | out: | |
1707 | *ret = status; | |
1708 | return session; | |
1709 | } | |
1710 | ||
1711 | /* caller must hold client_lock */ | |
1712 | static void | |
1713 | unhash_session(struct nfsd4_session *ses) | |
1714 | { | |
1715 | struct nfs4_client *clp = ses->se_client; | |
1716 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
1717 | ||
1718 | lockdep_assert_held(&nn->client_lock); | |
1719 | ||
1720 | list_del(&ses->se_hash); | |
1721 | spin_lock(&ses->se_client->cl_lock); | |
1722 | list_del(&ses->se_perclnt); | |
1723 | spin_unlock(&ses->se_client->cl_lock); | |
1724 | } | |
1725 | ||
1726 | /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */ | |
1727 | static int | |
1728 | STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn) | |
1729 | { | |
1730 | /* | |
1731 | * We're assuming the clid was not given out from a boot | |
1732 | * precisely 2^32 (about 136 years) before this one. That seems | |
1733 | * a safe assumption: | |
1734 | */ | |
1735 | if (clid->cl_boot == (u32)nn->boot_time) | |
1736 | return 0; | |
1737 | dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n", | |
1738 | clid->cl_boot, clid->cl_id, nn->boot_time); | |
1739 | return 1; | |
1740 | } | |
1741 | ||
1742 | /* | |
1743 | * XXX Should we use a slab cache ? | |
1744 | * This type of memory management is somewhat inefficient, but we use it | |
1745 | * anyway since SETCLIENTID is not a common operation. | |
1746 | */ | |
1747 | static struct nfs4_client *alloc_client(struct xdr_netobj name) | |
1748 | { | |
1749 | struct nfs4_client *clp; | |
1750 | int i; | |
1751 | ||
1752 | clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL); | |
1753 | if (clp == NULL) | |
1754 | return NULL; | |
1755 | clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL); | |
1756 | if (clp->cl_name.data == NULL) | |
1757 | goto err_no_name; | |
1758 | clp->cl_ownerstr_hashtbl = kmalloc(sizeof(struct list_head) * | |
1759 | OWNER_HASH_SIZE, GFP_KERNEL); | |
1760 | if (!clp->cl_ownerstr_hashtbl) | |
1761 | goto err_no_hashtbl; | |
1762 | for (i = 0; i < OWNER_HASH_SIZE; i++) | |
1763 | INIT_LIST_HEAD(&clp->cl_ownerstr_hashtbl[i]); | |
1764 | clp->cl_name.len = name.len; | |
1765 | INIT_LIST_HEAD(&clp->cl_sessions); | |
1766 | idr_init(&clp->cl_stateids); | |
1767 | atomic_set(&clp->cl_refcount, 0); | |
1768 | clp->cl_cb_state = NFSD4_CB_UNKNOWN; | |
1769 | INIT_LIST_HEAD(&clp->cl_idhash); | |
1770 | INIT_LIST_HEAD(&clp->cl_openowners); | |
1771 | INIT_LIST_HEAD(&clp->cl_delegations); | |
1772 | INIT_LIST_HEAD(&clp->cl_lru); | |
1773 | INIT_LIST_HEAD(&clp->cl_revoked); | |
1774 | #ifdef CONFIG_NFSD_PNFS | |
1775 | INIT_LIST_HEAD(&clp->cl_lo_states); | |
1776 | #endif | |
1777 | spin_lock_init(&clp->cl_lock); | |
1778 | rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table"); | |
1779 | return clp; | |
1780 | err_no_hashtbl: | |
1781 | kfree(clp->cl_name.data); | |
1782 | err_no_name: | |
1783 | kfree(clp); | |
1784 | return NULL; | |
1785 | } | |
1786 | ||
1787 | static void | |
1788 | free_client(struct nfs4_client *clp) | |
1789 | { | |
1790 | while (!list_empty(&clp->cl_sessions)) { | |
1791 | struct nfsd4_session *ses; | |
1792 | ses = list_entry(clp->cl_sessions.next, struct nfsd4_session, | |
1793 | se_perclnt); | |
1794 | list_del(&ses->se_perclnt); | |
1795 | WARN_ON_ONCE(atomic_read(&ses->se_ref)); | |
1796 | free_session(ses); | |
1797 | } | |
1798 | rpc_destroy_wait_queue(&clp->cl_cb_waitq); | |
1799 | free_svc_cred(&clp->cl_cred); | |
1800 | kfree(clp->cl_ownerstr_hashtbl); | |
1801 | kfree(clp->cl_name.data); | |
1802 | idr_destroy(&clp->cl_stateids); | |
1803 | kfree(clp); | |
1804 | } | |
1805 | ||
1806 | /* must be called under the client_lock */ | |
1807 | static void | |
1808 | unhash_client_locked(struct nfs4_client *clp) | |
1809 | { | |
1810 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
1811 | struct nfsd4_session *ses; | |
1812 | ||
1813 | lockdep_assert_held(&nn->client_lock); | |
1814 | ||
1815 | /* Mark the client as expired! */ | |
1816 | clp->cl_time = 0; | |
1817 | /* Make it invisible */ | |
1818 | if (!list_empty(&clp->cl_idhash)) { | |
1819 | list_del_init(&clp->cl_idhash); | |
1820 | if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags)) | |
1821 | rb_erase(&clp->cl_namenode, &nn->conf_name_tree); | |
1822 | else | |
1823 | rb_erase(&clp->cl_namenode, &nn->unconf_name_tree); | |
1824 | } | |
1825 | list_del_init(&clp->cl_lru); | |
1826 | spin_lock(&clp->cl_lock); | |
1827 | list_for_each_entry(ses, &clp->cl_sessions, se_perclnt) | |
1828 | list_del_init(&ses->se_hash); | |
1829 | spin_unlock(&clp->cl_lock); | |
1830 | } | |
1831 | ||
1832 | static void | |
1833 | unhash_client(struct nfs4_client *clp) | |
1834 | { | |
1835 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
1836 | ||
1837 | spin_lock(&nn->client_lock); | |
1838 | unhash_client_locked(clp); | |
1839 | spin_unlock(&nn->client_lock); | |
1840 | } | |
1841 | ||
1842 | static __be32 mark_client_expired_locked(struct nfs4_client *clp) | |
1843 | { | |
1844 | if (atomic_read(&clp->cl_refcount)) | |
1845 | return nfserr_jukebox; | |
1846 | unhash_client_locked(clp); | |
1847 | return nfs_ok; | |
1848 | } | |
1849 | ||
1850 | static void | |
1851 | __destroy_client(struct nfs4_client *clp) | |
1852 | { | |
1853 | struct nfs4_openowner *oo; | |
1854 | struct nfs4_delegation *dp; | |
1855 | struct list_head reaplist; | |
1856 | ||
1857 | INIT_LIST_HEAD(&reaplist); | |
1858 | spin_lock(&state_lock); | |
1859 | while (!list_empty(&clp->cl_delegations)) { | |
1860 | dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt); | |
1861 | WARN_ON(!unhash_delegation_locked(dp)); | |
1862 | list_add(&dp->dl_recall_lru, &reaplist); | |
1863 | } | |
1864 | spin_unlock(&state_lock); | |
1865 | while (!list_empty(&reaplist)) { | |
1866 | dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru); | |
1867 | list_del_init(&dp->dl_recall_lru); | |
1868 | put_clnt_odstate(dp->dl_clnt_odstate); | |
1869 | nfs4_put_deleg_lease(dp->dl_stid.sc_file); | |
1870 | nfs4_put_stid(&dp->dl_stid); | |
1871 | } | |
1872 | while (!list_empty(&clp->cl_revoked)) { | |
1873 | dp = list_entry(clp->cl_revoked.next, struct nfs4_delegation, dl_recall_lru); | |
1874 | list_del_init(&dp->dl_recall_lru); | |
1875 | nfs4_put_stid(&dp->dl_stid); | |
1876 | } | |
1877 | while (!list_empty(&clp->cl_openowners)) { | |
1878 | oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient); | |
1879 | nfs4_get_stateowner(&oo->oo_owner); | |
1880 | release_openowner(oo); | |
1881 | } | |
1882 | nfsd4_return_all_client_layouts(clp); | |
1883 | nfsd4_shutdown_callback(clp); | |
1884 | if (clp->cl_cb_conn.cb_xprt) | |
1885 | svc_xprt_put(clp->cl_cb_conn.cb_xprt); | |
1886 | free_client(clp); | |
1887 | } | |
1888 | ||
1889 | static void | |
1890 | destroy_client(struct nfs4_client *clp) | |
1891 | { | |
1892 | unhash_client(clp); | |
1893 | __destroy_client(clp); | |
1894 | } | |
1895 | ||
1896 | static void expire_client(struct nfs4_client *clp) | |
1897 | { | |
1898 | unhash_client(clp); | |
1899 | nfsd4_client_record_remove(clp); | |
1900 | __destroy_client(clp); | |
1901 | } | |
1902 | ||
1903 | static void copy_verf(struct nfs4_client *target, nfs4_verifier *source) | |
1904 | { | |
1905 | memcpy(target->cl_verifier.data, source->data, | |
1906 | sizeof(target->cl_verifier.data)); | |
1907 | } | |
1908 | ||
1909 | static void copy_clid(struct nfs4_client *target, struct nfs4_client *source) | |
1910 | { | |
1911 | target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; | |
1912 | target->cl_clientid.cl_id = source->cl_clientid.cl_id; | |
1913 | } | |
1914 | ||
1915 | static int copy_cred(struct svc_cred *target, struct svc_cred *source) | |
1916 | { | |
1917 | target->cr_principal = kstrdup(source->cr_principal, GFP_KERNEL); | |
1918 | target->cr_raw_principal = kstrdup(source->cr_raw_principal, | |
1919 | GFP_KERNEL); | |
1920 | if ((source->cr_principal && ! target->cr_principal) || | |
1921 | (source->cr_raw_principal && ! target->cr_raw_principal)) | |
1922 | return -ENOMEM; | |
1923 | ||
1924 | target->cr_flavor = source->cr_flavor; | |
1925 | target->cr_uid = source->cr_uid; | |
1926 | target->cr_gid = source->cr_gid; | |
1927 | target->cr_group_info = source->cr_group_info; | |
1928 | get_group_info(target->cr_group_info); | |
1929 | target->cr_gss_mech = source->cr_gss_mech; | |
1930 | if (source->cr_gss_mech) | |
1931 | gss_mech_get(source->cr_gss_mech); | |
1932 | return 0; | |
1933 | } | |
1934 | ||
1935 | static int | |
1936 | compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2) | |
1937 | { | |
1938 | if (o1->len < o2->len) | |
1939 | return -1; | |
1940 | if (o1->len > o2->len) | |
1941 | return 1; | |
1942 | return memcmp(o1->data, o2->data, o1->len); | |
1943 | } | |
1944 | ||
1945 | static int same_name(const char *n1, const char *n2) | |
1946 | { | |
1947 | return 0 == memcmp(n1, n2, HEXDIR_LEN); | |
1948 | } | |
1949 | ||
1950 | static int | |
1951 | same_verf(nfs4_verifier *v1, nfs4_verifier *v2) | |
1952 | { | |
1953 | return 0 == memcmp(v1->data, v2->data, sizeof(v1->data)); | |
1954 | } | |
1955 | ||
1956 | static int | |
1957 | same_clid(clientid_t *cl1, clientid_t *cl2) | |
1958 | { | |
1959 | return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id); | |
1960 | } | |
1961 | ||
1962 | static bool groups_equal(struct group_info *g1, struct group_info *g2) | |
1963 | { | |
1964 | int i; | |
1965 | ||
1966 | if (g1->ngroups != g2->ngroups) | |
1967 | return false; | |
1968 | for (i=0; i<g1->ngroups; i++) | |
1969 | if (!gid_eq(g1->gid[i], g2->gid[i])) | |
1970 | return false; | |
1971 | return true; | |
1972 | } | |
1973 | ||
1974 | /* | |
1975 | * RFC 3530 language requires clid_inuse be returned when the | |
1976 | * "principal" associated with a requests differs from that previously | |
1977 | * used. We use uid, gid's, and gss principal string as our best | |
1978 | * approximation. We also don't want to allow non-gss use of a client | |
1979 | * established using gss: in theory cr_principal should catch that | |
1980 | * change, but in practice cr_principal can be null even in the gss case | |
1981 | * since gssd doesn't always pass down a principal string. | |
1982 | */ | |
1983 | static bool is_gss_cred(struct svc_cred *cr) | |
1984 | { | |
1985 | /* Is cr_flavor one of the gss "pseudoflavors"?: */ | |
1986 | return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR); | |
1987 | } | |
1988 | ||
1989 | ||
1990 | static bool | |
1991 | same_creds(struct svc_cred *cr1, struct svc_cred *cr2) | |
1992 | { | |
1993 | if ((is_gss_cred(cr1) != is_gss_cred(cr2)) | |
1994 | || (!uid_eq(cr1->cr_uid, cr2->cr_uid)) | |
1995 | || (!gid_eq(cr1->cr_gid, cr2->cr_gid)) | |
1996 | || !groups_equal(cr1->cr_group_info, cr2->cr_group_info)) | |
1997 | return false; | |
1998 | if (cr1->cr_principal == cr2->cr_principal) | |
1999 | return true; | |
2000 | if (!cr1->cr_principal || !cr2->cr_principal) | |
2001 | return false; | |
2002 | return 0 == strcmp(cr1->cr_principal, cr2->cr_principal); | |
2003 | } | |
2004 | ||
2005 | static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp) | |
2006 | { | |
2007 | struct svc_cred *cr = &rqstp->rq_cred; | |
2008 | u32 service; | |
2009 | ||
2010 | if (!cr->cr_gss_mech) | |
2011 | return false; | |
2012 | service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor); | |
2013 | return service == RPC_GSS_SVC_INTEGRITY || | |
2014 | service == RPC_GSS_SVC_PRIVACY; | |
2015 | } | |
2016 | ||
2017 | bool nfsd4_mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp) | |
2018 | { | |
2019 | struct svc_cred *cr = &rqstp->rq_cred; | |
2020 | ||
2021 | if (!cl->cl_mach_cred) | |
2022 | return true; | |
2023 | if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech) | |
2024 | return false; | |
2025 | if (!svc_rqst_integrity_protected(rqstp)) | |
2026 | return false; | |
2027 | if (cl->cl_cred.cr_raw_principal) | |
2028 | return 0 == strcmp(cl->cl_cred.cr_raw_principal, | |
2029 | cr->cr_raw_principal); | |
2030 | if (!cr->cr_principal) | |
2031 | return false; | |
2032 | return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal); | |
2033 | } | |
2034 | ||
2035 | static void gen_confirm(struct nfs4_client *clp, struct nfsd_net *nn) | |
2036 | { | |
2037 | __be32 verf[2]; | |
2038 | ||
2039 | /* | |
2040 | * This is opaque to client, so no need to byte-swap. Use | |
2041 | * __force to keep sparse happy | |
2042 | */ | |
2043 | verf[0] = (__force __be32)get_seconds(); | |
2044 | verf[1] = (__force __be32)nn->clverifier_counter++; | |
2045 | memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data)); | |
2046 | } | |
2047 | ||
2048 | static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn) | |
2049 | { | |
2050 | clp->cl_clientid.cl_boot = nn->boot_time; | |
2051 | clp->cl_clientid.cl_id = nn->clientid_counter++; | |
2052 | gen_confirm(clp, nn); | |
2053 | } | |
2054 | ||
2055 | static struct nfs4_stid * | |
2056 | find_stateid_locked(struct nfs4_client *cl, stateid_t *t) | |
2057 | { | |
2058 | struct nfs4_stid *ret; | |
2059 | ||
2060 | ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id); | |
2061 | if (!ret || !ret->sc_type) | |
2062 | return NULL; | |
2063 | return ret; | |
2064 | } | |
2065 | ||
2066 | static struct nfs4_stid * | |
2067 | find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask) | |
2068 | { | |
2069 | struct nfs4_stid *s; | |
2070 | ||
2071 | spin_lock(&cl->cl_lock); | |
2072 | s = find_stateid_locked(cl, t); | |
2073 | if (s != NULL) { | |
2074 | if (typemask & s->sc_type) | |
2075 | atomic_inc(&s->sc_count); | |
2076 | else | |
2077 | s = NULL; | |
2078 | } | |
2079 | spin_unlock(&cl->cl_lock); | |
2080 | return s; | |
2081 | } | |
2082 | ||
2083 | static struct nfs4_client *create_client(struct xdr_netobj name, | |
2084 | struct svc_rqst *rqstp, nfs4_verifier *verf) | |
2085 | { | |
2086 | struct nfs4_client *clp; | |
2087 | struct sockaddr *sa = svc_addr(rqstp); | |
2088 | int ret; | |
2089 | struct net *net = SVC_NET(rqstp); | |
2090 | ||
2091 | clp = alloc_client(name); | |
2092 | if (clp == NULL) | |
2093 | return NULL; | |
2094 | ||
2095 | ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred); | |
2096 | if (ret) { | |
2097 | free_client(clp); | |
2098 | return NULL; | |
2099 | } | |
2100 | nfsd4_init_cb(&clp->cl_cb_null, clp, NULL, NFSPROC4_CLNT_CB_NULL); | |
2101 | clp->cl_time = get_seconds(); | |
2102 | clear_bit(0, &clp->cl_cb_slot_busy); | |
2103 | copy_verf(clp, verf); | |
2104 | rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa); | |
2105 | clp->cl_cb_session = NULL; | |
2106 | clp->net = net; | |
2107 | return clp; | |
2108 | } | |
2109 | ||
2110 | static void | |
2111 | add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root) | |
2112 | { | |
2113 | struct rb_node **new = &(root->rb_node), *parent = NULL; | |
2114 | struct nfs4_client *clp; | |
2115 | ||
2116 | while (*new) { | |
2117 | clp = rb_entry(*new, struct nfs4_client, cl_namenode); | |
2118 | parent = *new; | |
2119 | ||
2120 | if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0) | |
2121 | new = &((*new)->rb_left); | |
2122 | else | |
2123 | new = &((*new)->rb_right); | |
2124 | } | |
2125 | ||
2126 | rb_link_node(&new_clp->cl_namenode, parent, new); | |
2127 | rb_insert_color(&new_clp->cl_namenode, root); | |
2128 | } | |
2129 | ||
2130 | static struct nfs4_client * | |
2131 | find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root) | |
2132 | { | |
2133 | int cmp; | |
2134 | struct rb_node *node = root->rb_node; | |
2135 | struct nfs4_client *clp; | |
2136 | ||
2137 | while (node) { | |
2138 | clp = rb_entry(node, struct nfs4_client, cl_namenode); | |
2139 | cmp = compare_blob(&clp->cl_name, name); | |
2140 | if (cmp > 0) | |
2141 | node = node->rb_left; | |
2142 | else if (cmp < 0) | |
2143 | node = node->rb_right; | |
2144 | else | |
2145 | return clp; | |
2146 | } | |
2147 | return NULL; | |
2148 | } | |
2149 | ||
2150 | static void | |
2151 | add_to_unconfirmed(struct nfs4_client *clp) | |
2152 | { | |
2153 | unsigned int idhashval; | |
2154 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
2155 | ||
2156 | lockdep_assert_held(&nn->client_lock); | |
2157 | ||
2158 | clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags); | |
2159 | add_clp_to_name_tree(clp, &nn->unconf_name_tree); | |
2160 | idhashval = clientid_hashval(clp->cl_clientid.cl_id); | |
2161 | list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]); | |
2162 | renew_client_locked(clp); | |
2163 | } | |
2164 | ||
2165 | static void | |
2166 | move_to_confirmed(struct nfs4_client *clp) | |
2167 | { | |
2168 | unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id); | |
2169 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
2170 | ||
2171 | lockdep_assert_held(&nn->client_lock); | |
2172 | ||
2173 | dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp); | |
2174 | list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]); | |
2175 | rb_erase(&clp->cl_namenode, &nn->unconf_name_tree); | |
2176 | add_clp_to_name_tree(clp, &nn->conf_name_tree); | |
2177 | set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags); | |
2178 | renew_client_locked(clp); | |
2179 | } | |
2180 | ||
2181 | static struct nfs4_client * | |
2182 | find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions) | |
2183 | { | |
2184 | struct nfs4_client *clp; | |
2185 | unsigned int idhashval = clientid_hashval(clid->cl_id); | |
2186 | ||
2187 | list_for_each_entry(clp, &tbl[idhashval], cl_idhash) { | |
2188 | if (same_clid(&clp->cl_clientid, clid)) { | |
2189 | if ((bool)clp->cl_minorversion != sessions) | |
2190 | return NULL; | |
2191 | renew_client_locked(clp); | |
2192 | return clp; | |
2193 | } | |
2194 | } | |
2195 | return NULL; | |
2196 | } | |
2197 | ||
2198 | static struct nfs4_client * | |
2199 | find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn) | |
2200 | { | |
2201 | struct list_head *tbl = nn->conf_id_hashtbl; | |
2202 | ||
2203 | lockdep_assert_held(&nn->client_lock); | |
2204 | return find_client_in_id_table(tbl, clid, sessions); | |
2205 | } | |
2206 | ||
2207 | static struct nfs4_client * | |
2208 | find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn) | |
2209 | { | |
2210 | struct list_head *tbl = nn->unconf_id_hashtbl; | |
2211 | ||
2212 | lockdep_assert_held(&nn->client_lock); | |
2213 | return find_client_in_id_table(tbl, clid, sessions); | |
2214 | } | |
2215 | ||
2216 | static bool clp_used_exchangeid(struct nfs4_client *clp) | |
2217 | { | |
2218 | return clp->cl_exchange_flags != 0; | |
2219 | } | |
2220 | ||
2221 | static struct nfs4_client * | |
2222 | find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn) | |
2223 | { | |
2224 | lockdep_assert_held(&nn->client_lock); | |
2225 | return find_clp_in_name_tree(name, &nn->conf_name_tree); | |
2226 | } | |
2227 | ||
2228 | static struct nfs4_client * | |
2229 | find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn) | |
2230 | { | |
2231 | lockdep_assert_held(&nn->client_lock); | |
2232 | return find_clp_in_name_tree(name, &nn->unconf_name_tree); | |
2233 | } | |
2234 | ||
2235 | static void | |
2236 | gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp) | |
2237 | { | |
2238 | struct nfs4_cb_conn *conn = &clp->cl_cb_conn; | |
2239 | struct sockaddr *sa = svc_addr(rqstp); | |
2240 | u32 scopeid = rpc_get_scope_id(sa); | |
2241 | unsigned short expected_family; | |
2242 | ||
2243 | /* Currently, we only support tcp and tcp6 for the callback channel */ | |
2244 | if (se->se_callback_netid_len == 3 && | |
2245 | !memcmp(se->se_callback_netid_val, "tcp", 3)) | |
2246 | expected_family = AF_INET; | |
2247 | else if (se->se_callback_netid_len == 4 && | |
2248 | !memcmp(se->se_callback_netid_val, "tcp6", 4)) | |
2249 | expected_family = AF_INET6; | |
2250 | else | |
2251 | goto out_err; | |
2252 | ||
2253 | conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val, | |
2254 | se->se_callback_addr_len, | |
2255 | (struct sockaddr *)&conn->cb_addr, | |
2256 | sizeof(conn->cb_addr)); | |
2257 | ||
2258 | if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family) | |
2259 | goto out_err; | |
2260 | ||
2261 | if (conn->cb_addr.ss_family == AF_INET6) | |
2262 | ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid; | |
2263 | ||
2264 | conn->cb_prog = se->se_callback_prog; | |
2265 | conn->cb_ident = se->se_callback_ident; | |
2266 | memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen); | |
2267 | return; | |
2268 | out_err: | |
2269 | conn->cb_addr.ss_family = AF_UNSPEC; | |
2270 | conn->cb_addrlen = 0; | |
2271 | dprintk("NFSD: this client (clientid %08x/%08x) " | |
2272 | "will not receive delegations\n", | |
2273 | clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id); | |
2274 | ||
2275 | return; | |
2276 | } | |
2277 | ||
2278 | /* | |
2279 | * Cache a reply. nfsd4_check_resp_size() has bounded the cache size. | |
2280 | */ | |
2281 | static void | |
2282 | nfsd4_store_cache_entry(struct nfsd4_compoundres *resp) | |
2283 | { | |
2284 | struct xdr_buf *buf = resp->xdr.buf; | |
2285 | struct nfsd4_slot *slot = resp->cstate.slot; | |
2286 | unsigned int base; | |
2287 | ||
2288 | dprintk("--> %s slot %p\n", __func__, slot); | |
2289 | ||
2290 | slot->sl_opcnt = resp->opcnt; | |
2291 | slot->sl_status = resp->cstate.status; | |
2292 | ||
2293 | slot->sl_flags |= NFSD4_SLOT_INITIALIZED; | |
2294 | if (nfsd4_not_cached(resp)) { | |
2295 | slot->sl_datalen = 0; | |
2296 | return; | |
2297 | } | |
2298 | base = resp->cstate.data_offset; | |
2299 | slot->sl_datalen = buf->len - base; | |
2300 | if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen)) | |
2301 | WARN(1, "%s: sessions DRC could not cache compound\n", | |
2302 | __func__); | |
2303 | return; | |
2304 | } | |
2305 | ||
2306 | /* | |
2307 | * Encode the replay sequence operation from the slot values. | |
2308 | * If cachethis is FALSE encode the uncached rep error on the next | |
2309 | * operation which sets resp->p and increments resp->opcnt for | |
2310 | * nfs4svc_encode_compoundres. | |
2311 | * | |
2312 | */ | |
2313 | static __be32 | |
2314 | nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args, | |
2315 | struct nfsd4_compoundres *resp) | |
2316 | { | |
2317 | struct nfsd4_op *op; | |
2318 | struct nfsd4_slot *slot = resp->cstate.slot; | |
2319 | ||
2320 | /* Encode the replayed sequence operation */ | |
2321 | op = &args->ops[resp->opcnt - 1]; | |
2322 | nfsd4_encode_operation(resp, op); | |
2323 | ||
2324 | /* Return nfserr_retry_uncached_rep in next operation. */ | |
2325 | if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) { | |
2326 | op = &args->ops[resp->opcnt++]; | |
2327 | op->status = nfserr_retry_uncached_rep; | |
2328 | nfsd4_encode_operation(resp, op); | |
2329 | } | |
2330 | return op->status; | |
2331 | } | |
2332 | ||
2333 | /* | |
2334 | * The sequence operation is not cached because we can use the slot and | |
2335 | * session values. | |
2336 | */ | |
2337 | static __be32 | |
2338 | nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp, | |
2339 | struct nfsd4_sequence *seq) | |
2340 | { | |
2341 | struct nfsd4_slot *slot = resp->cstate.slot; | |
2342 | struct xdr_stream *xdr = &resp->xdr; | |
2343 | __be32 *p; | |
2344 | __be32 status; | |
2345 | ||
2346 | dprintk("--> %s slot %p\n", __func__, slot); | |
2347 | ||
2348 | status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp); | |
2349 | if (status) | |
2350 | return status; | |
2351 | ||
2352 | p = xdr_reserve_space(xdr, slot->sl_datalen); | |
2353 | if (!p) { | |
2354 | WARN_ON_ONCE(1); | |
2355 | return nfserr_serverfault; | |
2356 | } | |
2357 | xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen); | |
2358 | xdr_commit_encode(xdr); | |
2359 | ||
2360 | resp->opcnt = slot->sl_opcnt; | |
2361 | return slot->sl_status; | |
2362 | } | |
2363 | ||
2364 | /* | |
2365 | * Set the exchange_id flags returned by the server. | |
2366 | */ | |
2367 | static void | |
2368 | nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid) | |
2369 | { | |
2370 | #ifdef CONFIG_NFSD_PNFS | |
2371 | new->cl_exchange_flags |= EXCHGID4_FLAG_USE_PNFS_MDS; | |
2372 | #else | |
2373 | new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS; | |
2374 | #endif | |
2375 | ||
2376 | /* Referrals are supported, Migration is not. */ | |
2377 | new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER; | |
2378 | ||
2379 | /* set the wire flags to return to client. */ | |
2380 | clid->flags = new->cl_exchange_flags; | |
2381 | } | |
2382 | ||
2383 | static bool client_has_openowners(struct nfs4_client *clp) | |
2384 | { | |
2385 | struct nfs4_openowner *oo; | |
2386 | ||
2387 | list_for_each_entry(oo, &clp->cl_openowners, oo_perclient) { | |
2388 | if (!list_empty(&oo->oo_owner.so_stateids)) | |
2389 | return true; | |
2390 | } | |
2391 | return false; | |
2392 | } | |
2393 | ||
2394 | static bool client_has_state(struct nfs4_client *clp) | |
2395 | { | |
2396 | return client_has_openowners(clp) | |
2397 | #ifdef CONFIG_NFSD_PNFS | |
2398 | || !list_empty(&clp->cl_lo_states) | |
2399 | #endif | |
2400 | || !list_empty(&clp->cl_delegations) | |
2401 | || !list_empty(&clp->cl_sessions); | |
2402 | } | |
2403 | ||
2404 | __be32 | |
2405 | nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, | |
2406 | union nfsd4_op_u *u) | |
2407 | { | |
2408 | struct nfsd4_exchange_id *exid = &u->exchange_id; | |
2409 | struct nfs4_client *conf, *new; | |
2410 | struct nfs4_client *unconf = NULL; | |
2411 | __be32 status; | |
2412 | char addr_str[INET6_ADDRSTRLEN]; | |
2413 | nfs4_verifier verf = exid->verifier; | |
2414 | struct sockaddr *sa = svc_addr(rqstp); | |
2415 | bool update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A; | |
2416 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
2417 | ||
2418 | rpc_ntop(sa, addr_str, sizeof(addr_str)); | |
2419 | dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p " | |
2420 | "ip_addr=%s flags %x, spa_how %d\n", | |
2421 | __func__, rqstp, exid, exid->clname.len, exid->clname.data, | |
2422 | addr_str, exid->flags, exid->spa_how); | |
2423 | ||
2424 | if (exid->flags & ~EXCHGID4_FLAG_MASK_A) | |
2425 | return nfserr_inval; | |
2426 | ||
2427 | new = create_client(exid->clname, rqstp, &verf); | |
2428 | if (new == NULL) | |
2429 | return nfserr_jukebox; | |
2430 | ||
2431 | switch (exid->spa_how) { | |
2432 | case SP4_MACH_CRED: | |
2433 | exid->spo_must_enforce[0] = 0; | |
2434 | exid->spo_must_enforce[1] = ( | |
2435 | 1 << (OP_BIND_CONN_TO_SESSION - 32) | | |
2436 | 1 << (OP_EXCHANGE_ID - 32) | | |
2437 | 1 << (OP_CREATE_SESSION - 32) | | |
2438 | 1 << (OP_DESTROY_SESSION - 32) | | |
2439 | 1 << (OP_DESTROY_CLIENTID - 32)); | |
2440 | ||
2441 | exid->spo_must_allow[0] &= (1 << (OP_CLOSE) | | |
2442 | 1 << (OP_OPEN_DOWNGRADE) | | |
2443 | 1 << (OP_LOCKU) | | |
2444 | 1 << (OP_DELEGRETURN)); | |
2445 | ||
2446 | exid->spo_must_allow[1] &= ( | |
2447 | 1 << (OP_TEST_STATEID - 32) | | |
2448 | 1 << (OP_FREE_STATEID - 32)); | |
2449 | if (!svc_rqst_integrity_protected(rqstp)) { | |
2450 | status = nfserr_inval; | |
2451 | goto out_nolock; | |
2452 | } | |
2453 | /* | |
2454 | * Sometimes userspace doesn't give us a principal. | |
2455 | * Which is a bug, really. Anyway, we can't enforce | |
2456 | * MACH_CRED in that case, better to give up now: | |
2457 | */ | |
2458 | if (!new->cl_cred.cr_principal && | |
2459 | !new->cl_cred.cr_raw_principal) { | |
2460 | status = nfserr_serverfault; | |
2461 | goto out_nolock; | |
2462 | } | |
2463 | new->cl_mach_cred = true; | |
2464 | case SP4_NONE: | |
2465 | break; | |
2466 | default: /* checked by xdr code */ | |
2467 | WARN_ON_ONCE(1); | |
2468 | case SP4_SSV: | |
2469 | status = nfserr_encr_alg_unsupp; | |
2470 | goto out_nolock; | |
2471 | } | |
2472 | ||
2473 | /* Cases below refer to rfc 5661 section 18.35.4: */ | |
2474 | spin_lock(&nn->client_lock); | |
2475 | conf = find_confirmed_client_by_name(&exid->clname, nn); | |
2476 | if (conf) { | |
2477 | bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred); | |
2478 | bool verfs_match = same_verf(&verf, &conf->cl_verifier); | |
2479 | ||
2480 | if (update) { | |
2481 | if (!clp_used_exchangeid(conf)) { /* buggy client */ | |
2482 | status = nfserr_inval; | |
2483 | goto out; | |
2484 | } | |
2485 | if (!nfsd4_mach_creds_match(conf, rqstp)) { | |
2486 | status = nfserr_wrong_cred; | |
2487 | goto out; | |
2488 | } | |
2489 | if (!creds_match) { /* case 9 */ | |
2490 | status = nfserr_perm; | |
2491 | goto out; | |
2492 | } | |
2493 | if (!verfs_match) { /* case 8 */ | |
2494 | status = nfserr_not_same; | |
2495 | goto out; | |
2496 | } | |
2497 | /* case 6 */ | |
2498 | exid->flags |= EXCHGID4_FLAG_CONFIRMED_R; | |
2499 | goto out_copy; | |
2500 | } | |
2501 | if (!creds_match) { /* case 3 */ | |
2502 | if (client_has_state(conf)) { | |
2503 | status = nfserr_clid_inuse; | |
2504 | goto out; | |
2505 | } | |
2506 | goto out_new; | |
2507 | } | |
2508 | if (verfs_match) { /* case 2 */ | |
2509 | conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R; | |
2510 | goto out_copy; | |
2511 | } | |
2512 | /* case 5, client reboot */ | |
2513 | conf = NULL; | |
2514 | goto out_new; | |
2515 | } | |
2516 | ||
2517 | if (update) { /* case 7 */ | |
2518 | status = nfserr_noent; | |
2519 | goto out; | |
2520 | } | |
2521 | ||
2522 | unconf = find_unconfirmed_client_by_name(&exid->clname, nn); | |
2523 | if (unconf) /* case 4, possible retry or client restart */ | |
2524 | unhash_client_locked(unconf); | |
2525 | ||
2526 | /* case 1 (normal case) */ | |
2527 | out_new: | |
2528 | if (conf) { | |
2529 | status = mark_client_expired_locked(conf); | |
2530 | if (status) | |
2531 | goto out; | |
2532 | } | |
2533 | new->cl_minorversion = cstate->minorversion; | |
2534 | new->cl_spo_must_allow.u.words[0] = exid->spo_must_allow[0]; | |
2535 | new->cl_spo_must_allow.u.words[1] = exid->spo_must_allow[1]; | |
2536 | ||
2537 | gen_clid(new, nn); | |
2538 | add_to_unconfirmed(new); | |
2539 | swap(new, conf); | |
2540 | out_copy: | |
2541 | exid->clientid.cl_boot = conf->cl_clientid.cl_boot; | |
2542 | exid->clientid.cl_id = conf->cl_clientid.cl_id; | |
2543 | ||
2544 | exid->seqid = conf->cl_cs_slot.sl_seqid + 1; | |
2545 | nfsd4_set_ex_flags(conf, exid); | |
2546 | ||
2547 | dprintk("nfsd4_exchange_id seqid %d flags %x\n", | |
2548 | conf->cl_cs_slot.sl_seqid, conf->cl_exchange_flags); | |
2549 | status = nfs_ok; | |
2550 | ||
2551 | out: | |
2552 | spin_unlock(&nn->client_lock); | |
2553 | out_nolock: | |
2554 | if (new) | |
2555 | expire_client(new); | |
2556 | if (unconf) | |
2557 | expire_client(unconf); | |
2558 | return status; | |
2559 | } | |
2560 | ||
2561 | static __be32 | |
2562 | check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse) | |
2563 | { | |
2564 | dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid, | |
2565 | slot_seqid); | |
2566 | ||
2567 | /* The slot is in use, and no response has been sent. */ | |
2568 | if (slot_inuse) { | |
2569 | if (seqid == slot_seqid) | |
2570 | return nfserr_jukebox; | |
2571 | else | |
2572 | return nfserr_seq_misordered; | |
2573 | } | |
2574 | /* Note unsigned 32-bit arithmetic handles wraparound: */ | |
2575 | if (likely(seqid == slot_seqid + 1)) | |
2576 | return nfs_ok; | |
2577 | if (seqid == slot_seqid) | |
2578 | return nfserr_replay_cache; | |
2579 | return nfserr_seq_misordered; | |
2580 | } | |
2581 | ||
2582 | /* | |
2583 | * Cache the create session result into the create session single DRC | |
2584 | * slot cache by saving the xdr structure. sl_seqid has been set. | |
2585 | * Do this for solo or embedded create session operations. | |
2586 | */ | |
2587 | static void | |
2588 | nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses, | |
2589 | struct nfsd4_clid_slot *slot, __be32 nfserr) | |
2590 | { | |
2591 | slot->sl_status = nfserr; | |
2592 | memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses)); | |
2593 | } | |
2594 | ||
2595 | static __be32 | |
2596 | nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses, | |
2597 | struct nfsd4_clid_slot *slot) | |
2598 | { | |
2599 | memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses)); | |
2600 | return slot->sl_status; | |
2601 | } | |
2602 | ||
2603 | #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\ | |
2604 | 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \ | |
2605 | 1 + /* MIN tag is length with zero, only length */ \ | |
2606 | 3 + /* version, opcount, opcode */ \ | |
2607 | XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \ | |
2608 | /* seqid, slotID, slotID, cache */ \ | |
2609 | 4 ) * sizeof(__be32)) | |
2610 | ||
2611 | #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\ | |
2612 | 2 + /* verifier: AUTH_NULL, length 0 */\ | |
2613 | 1 + /* status */ \ | |
2614 | 1 + /* MIN tag is length with zero, only length */ \ | |
2615 | 3 + /* opcount, opcode, opstatus*/ \ | |
2616 | XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \ | |
2617 | /* seqid, slotID, slotID, slotID, status */ \ | |
2618 | 5 ) * sizeof(__be32)) | |
2619 | ||
2620 | static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn) | |
2621 | { | |
2622 | u32 maxrpc = nn->nfsd_serv->sv_max_mesg; | |
2623 | ||
2624 | if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ) | |
2625 | return nfserr_toosmall; | |
2626 | if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ) | |
2627 | return nfserr_toosmall; | |
2628 | ca->headerpadsz = 0; | |
2629 | ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc); | |
2630 | ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc); | |
2631 | ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND); | |
2632 | ca->maxresp_cached = min_t(u32, ca->maxresp_cached, | |
2633 | NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ); | |
2634 | ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION); | |
2635 | /* | |
2636 | * Note decreasing slot size below client's request may make it | |
2637 | * difficult for client to function correctly, whereas | |
2638 | * decreasing the number of slots will (just?) affect | |
2639 | * performance. When short on memory we therefore prefer to | |
2640 | * decrease number of slots instead of their size. Clients that | |
2641 | * request larger slots than they need will get poor results: | |
2642 | */ | |
2643 | ca->maxreqs = nfsd4_get_drc_mem(ca); | |
2644 | if (!ca->maxreqs) | |
2645 | return nfserr_jukebox; | |
2646 | ||
2647 | return nfs_ok; | |
2648 | } | |
2649 | ||
2650 | /* | |
2651 | * Server's NFSv4.1 backchannel support is AUTH_SYS-only for now. | |
2652 | * These are based on similar macros in linux/sunrpc/msg_prot.h . | |
2653 | */ | |
2654 | #define RPC_MAX_HEADER_WITH_AUTH_SYS \ | |
2655 | (RPC_CALLHDRSIZE + 2 * (2 + UNX_CALLSLACK)) | |
2656 | ||
2657 | #define RPC_MAX_REPHEADER_WITH_AUTH_SYS \ | |
2658 | (RPC_REPHDRSIZE + (2 + NUL_REPLYSLACK)) | |
2659 | ||
2660 | #define NFSD_CB_MAX_REQ_SZ ((NFS4_enc_cb_recall_sz + \ | |
2661 | RPC_MAX_HEADER_WITH_AUTH_SYS) * sizeof(__be32)) | |
2662 | #define NFSD_CB_MAX_RESP_SZ ((NFS4_dec_cb_recall_sz + \ | |
2663 | RPC_MAX_REPHEADER_WITH_AUTH_SYS) * \ | |
2664 | sizeof(__be32)) | |
2665 | ||
2666 | static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca) | |
2667 | { | |
2668 | ca->headerpadsz = 0; | |
2669 | ||
2670 | if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ) | |
2671 | return nfserr_toosmall; | |
2672 | if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ) | |
2673 | return nfserr_toosmall; | |
2674 | ca->maxresp_cached = 0; | |
2675 | if (ca->maxops < 2) | |
2676 | return nfserr_toosmall; | |
2677 | ||
2678 | return nfs_ok; | |
2679 | } | |
2680 | ||
2681 | static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs) | |
2682 | { | |
2683 | switch (cbs->flavor) { | |
2684 | case RPC_AUTH_NULL: | |
2685 | case RPC_AUTH_UNIX: | |
2686 | return nfs_ok; | |
2687 | default: | |
2688 | /* | |
2689 | * GSS case: the spec doesn't allow us to return this | |
2690 | * error. But it also doesn't allow us not to support | |
2691 | * GSS. | |
2692 | * I'd rather this fail hard than return some error the | |
2693 | * client might think it can already handle: | |
2694 | */ | |
2695 | return nfserr_encr_alg_unsupp; | |
2696 | } | |
2697 | } | |
2698 | ||
2699 | __be32 | |
2700 | nfsd4_create_session(struct svc_rqst *rqstp, | |
2701 | struct nfsd4_compound_state *cstate, union nfsd4_op_u *u) | |
2702 | { | |
2703 | struct nfsd4_create_session *cr_ses = &u->create_session; | |
2704 | struct sockaddr *sa = svc_addr(rqstp); | |
2705 | struct nfs4_client *conf, *unconf; | |
2706 | struct nfs4_client *old = NULL; | |
2707 | struct nfsd4_session *new; | |
2708 | struct nfsd4_conn *conn; | |
2709 | struct nfsd4_clid_slot *cs_slot = NULL; | |
2710 | __be32 status = 0; | |
2711 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
2712 | ||
2713 | if (cr_ses->flags & ~SESSION4_FLAG_MASK_A) | |
2714 | return nfserr_inval; | |
2715 | status = nfsd4_check_cb_sec(&cr_ses->cb_sec); | |
2716 | if (status) | |
2717 | return status; | |
2718 | status = check_forechannel_attrs(&cr_ses->fore_channel, nn); | |
2719 | if (status) | |
2720 | return status; | |
2721 | status = check_backchannel_attrs(&cr_ses->back_channel); | |
2722 | if (status) | |
2723 | goto out_release_drc_mem; | |
2724 | status = nfserr_jukebox; | |
2725 | new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel); | |
2726 | if (!new) | |
2727 | goto out_release_drc_mem; | |
2728 | conn = alloc_conn_from_crses(rqstp, cr_ses); | |
2729 | if (!conn) | |
2730 | goto out_free_session; | |
2731 | ||
2732 | spin_lock(&nn->client_lock); | |
2733 | unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn); | |
2734 | conf = find_confirmed_client(&cr_ses->clientid, true, nn); | |
2735 | WARN_ON_ONCE(conf && unconf); | |
2736 | ||
2737 | if (conf) { | |
2738 | status = nfserr_wrong_cred; | |
2739 | if (!nfsd4_mach_creds_match(conf, rqstp)) | |
2740 | goto out_free_conn; | |
2741 | cs_slot = &conf->cl_cs_slot; | |
2742 | status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0); | |
2743 | if (status) { | |
2744 | if (status == nfserr_replay_cache) | |
2745 | status = nfsd4_replay_create_session(cr_ses, cs_slot); | |
2746 | goto out_free_conn; | |
2747 | } | |
2748 | } else if (unconf) { | |
2749 | if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) || | |
2750 | !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) { | |
2751 | status = nfserr_clid_inuse; | |
2752 | goto out_free_conn; | |
2753 | } | |
2754 | status = nfserr_wrong_cred; | |
2755 | if (!nfsd4_mach_creds_match(unconf, rqstp)) | |
2756 | goto out_free_conn; | |
2757 | cs_slot = &unconf->cl_cs_slot; | |
2758 | status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0); | |
2759 | if (status) { | |
2760 | /* an unconfirmed replay returns misordered */ | |
2761 | status = nfserr_seq_misordered; | |
2762 | goto out_free_conn; | |
2763 | } | |
2764 | old = find_confirmed_client_by_name(&unconf->cl_name, nn); | |
2765 | if (old) { | |
2766 | status = mark_client_expired_locked(old); | |
2767 | if (status) { | |
2768 | old = NULL; | |
2769 | goto out_free_conn; | |
2770 | } | |
2771 | } | |
2772 | move_to_confirmed(unconf); | |
2773 | conf = unconf; | |
2774 | } else { | |
2775 | status = nfserr_stale_clientid; | |
2776 | goto out_free_conn; | |
2777 | } | |
2778 | status = nfs_ok; | |
2779 | /* Persistent sessions are not supported */ | |
2780 | cr_ses->flags &= ~SESSION4_PERSIST; | |
2781 | /* Upshifting from TCP to RDMA is not supported */ | |
2782 | cr_ses->flags &= ~SESSION4_RDMA; | |
2783 | ||
2784 | init_session(rqstp, new, conf, cr_ses); | |
2785 | nfsd4_get_session_locked(new); | |
2786 | ||
2787 | memcpy(cr_ses->sessionid.data, new->se_sessionid.data, | |
2788 | NFS4_MAX_SESSIONID_LEN); | |
2789 | cs_slot->sl_seqid++; | |
2790 | cr_ses->seqid = cs_slot->sl_seqid; | |
2791 | ||
2792 | /* cache solo and embedded create sessions under the client_lock */ | |
2793 | nfsd4_cache_create_session(cr_ses, cs_slot, status); | |
2794 | spin_unlock(&nn->client_lock); | |
2795 | /* init connection and backchannel */ | |
2796 | nfsd4_init_conn(rqstp, conn, new); | |
2797 | nfsd4_put_session(new); | |
2798 | if (old) | |
2799 | expire_client(old); | |
2800 | return status; | |
2801 | out_free_conn: | |
2802 | spin_unlock(&nn->client_lock); | |
2803 | free_conn(conn); | |
2804 | if (old) | |
2805 | expire_client(old); | |
2806 | out_free_session: | |
2807 | __free_session(new); | |
2808 | out_release_drc_mem: | |
2809 | nfsd4_put_drc_mem(&cr_ses->fore_channel); | |
2810 | return status; | |
2811 | } | |
2812 | ||
2813 | static __be32 nfsd4_map_bcts_dir(u32 *dir) | |
2814 | { | |
2815 | switch (*dir) { | |
2816 | case NFS4_CDFC4_FORE: | |
2817 | case NFS4_CDFC4_BACK: | |
2818 | return nfs_ok; | |
2819 | case NFS4_CDFC4_FORE_OR_BOTH: | |
2820 | case NFS4_CDFC4_BACK_OR_BOTH: | |
2821 | *dir = NFS4_CDFC4_BOTH; | |
2822 | return nfs_ok; | |
2823 | }; | |
2824 | return nfserr_inval; | |
2825 | } | |
2826 | ||
2827 | __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, | |
2828 | struct nfsd4_compound_state *cstate, | |
2829 | union nfsd4_op_u *u) | |
2830 | { | |
2831 | struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl; | |
2832 | struct nfsd4_session *session = cstate->session; | |
2833 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
2834 | __be32 status; | |
2835 | ||
2836 | status = nfsd4_check_cb_sec(&bc->bc_cb_sec); | |
2837 | if (status) | |
2838 | return status; | |
2839 | spin_lock(&nn->client_lock); | |
2840 | session->se_cb_prog = bc->bc_cb_program; | |
2841 | session->se_cb_sec = bc->bc_cb_sec; | |
2842 | spin_unlock(&nn->client_lock); | |
2843 | ||
2844 | nfsd4_probe_callback(session->se_client); | |
2845 | ||
2846 | return nfs_ok; | |
2847 | } | |
2848 | ||
2849 | __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp, | |
2850 | struct nfsd4_compound_state *cstate, | |
2851 | union nfsd4_op_u *u) | |
2852 | { | |
2853 | struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session; | |
2854 | __be32 status; | |
2855 | struct nfsd4_conn *conn; | |
2856 | struct nfsd4_session *session; | |
2857 | struct net *net = SVC_NET(rqstp); | |
2858 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
2859 | ||
2860 | if (!nfsd4_last_compound_op(rqstp)) | |
2861 | return nfserr_not_only_op; | |
2862 | spin_lock(&nn->client_lock); | |
2863 | session = find_in_sessionid_hashtbl(&bcts->sessionid, net, &status); | |
2864 | spin_unlock(&nn->client_lock); | |
2865 | if (!session) | |
2866 | goto out_no_session; | |
2867 | status = nfserr_wrong_cred; | |
2868 | if (!nfsd4_mach_creds_match(session->se_client, rqstp)) | |
2869 | goto out; | |
2870 | status = nfsd4_map_bcts_dir(&bcts->dir); | |
2871 | if (status) | |
2872 | goto out; | |
2873 | conn = alloc_conn(rqstp, bcts->dir); | |
2874 | status = nfserr_jukebox; | |
2875 | if (!conn) | |
2876 | goto out; | |
2877 | nfsd4_init_conn(rqstp, conn, session); | |
2878 | status = nfs_ok; | |
2879 | out: | |
2880 | nfsd4_put_session(session); | |
2881 | out_no_session: | |
2882 | return status; | |
2883 | } | |
2884 | ||
2885 | static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid) | |
2886 | { | |
2887 | if (!session) | |
2888 | return 0; | |
2889 | return !memcmp(sid, &session->se_sessionid, sizeof(*sid)); | |
2890 | } | |
2891 | ||
2892 | __be32 | |
2893 | nfsd4_destroy_session(struct svc_rqst *r, struct nfsd4_compound_state *cstate, | |
2894 | union nfsd4_op_u *u) | |
2895 | { | |
2896 | struct nfsd4_destroy_session *sessionid = &u->destroy_session; | |
2897 | struct nfsd4_session *ses; | |
2898 | __be32 status; | |
2899 | int ref_held_by_me = 0; | |
2900 | struct net *net = SVC_NET(r); | |
2901 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
2902 | ||
2903 | status = nfserr_not_only_op; | |
2904 | if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) { | |
2905 | if (!nfsd4_last_compound_op(r)) | |
2906 | goto out; | |
2907 | ref_held_by_me++; | |
2908 | } | |
2909 | dump_sessionid(__func__, &sessionid->sessionid); | |
2910 | spin_lock(&nn->client_lock); | |
2911 | ses = find_in_sessionid_hashtbl(&sessionid->sessionid, net, &status); | |
2912 | if (!ses) | |
2913 | goto out_client_lock; | |
2914 | status = nfserr_wrong_cred; | |
2915 | if (!nfsd4_mach_creds_match(ses->se_client, r)) | |
2916 | goto out_put_session; | |
2917 | status = mark_session_dead_locked(ses, 1 + ref_held_by_me); | |
2918 | if (status) | |
2919 | goto out_put_session; | |
2920 | unhash_session(ses); | |
2921 | spin_unlock(&nn->client_lock); | |
2922 | ||
2923 | nfsd4_probe_callback_sync(ses->se_client); | |
2924 | ||
2925 | spin_lock(&nn->client_lock); | |
2926 | status = nfs_ok; | |
2927 | out_put_session: | |
2928 | nfsd4_put_session_locked(ses); | |
2929 | out_client_lock: | |
2930 | spin_unlock(&nn->client_lock); | |
2931 | out: | |
2932 | return status; | |
2933 | } | |
2934 | ||
2935 | static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s) | |
2936 | { | |
2937 | struct nfsd4_conn *c; | |
2938 | ||
2939 | list_for_each_entry(c, &s->se_conns, cn_persession) { | |
2940 | if (c->cn_xprt == xpt) { | |
2941 | return c; | |
2942 | } | |
2943 | } | |
2944 | return NULL; | |
2945 | } | |
2946 | ||
2947 | static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses) | |
2948 | { | |
2949 | struct nfs4_client *clp = ses->se_client; | |
2950 | struct nfsd4_conn *c; | |
2951 | __be32 status = nfs_ok; | |
2952 | int ret; | |
2953 | ||
2954 | spin_lock(&clp->cl_lock); | |
2955 | c = __nfsd4_find_conn(new->cn_xprt, ses); | |
2956 | if (c) | |
2957 | goto out_free; | |
2958 | status = nfserr_conn_not_bound_to_session; | |
2959 | if (clp->cl_mach_cred) | |
2960 | goto out_free; | |
2961 | __nfsd4_hash_conn(new, ses); | |
2962 | spin_unlock(&clp->cl_lock); | |
2963 | ret = nfsd4_register_conn(new); | |
2964 | if (ret) | |
2965 | /* oops; xprt is already down: */ | |
2966 | nfsd4_conn_lost(&new->cn_xpt_user); | |
2967 | return nfs_ok; | |
2968 | out_free: | |
2969 | spin_unlock(&clp->cl_lock); | |
2970 | free_conn(new); | |
2971 | return status; | |
2972 | } | |
2973 | ||
2974 | static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session) | |
2975 | { | |
2976 | struct nfsd4_compoundargs *args = rqstp->rq_argp; | |
2977 | ||
2978 | return args->opcnt > session->se_fchannel.maxops; | |
2979 | } | |
2980 | ||
2981 | static bool nfsd4_request_too_big(struct svc_rqst *rqstp, | |
2982 | struct nfsd4_session *session) | |
2983 | { | |
2984 | struct xdr_buf *xb = &rqstp->rq_arg; | |
2985 | ||
2986 | return xb->len > session->se_fchannel.maxreq_sz; | |
2987 | } | |
2988 | ||
2989 | __be32 | |
2990 | nfsd4_sequence(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, | |
2991 | union nfsd4_op_u *u) | |
2992 | { | |
2993 | struct nfsd4_sequence *seq = &u->sequence; | |
2994 | struct nfsd4_compoundres *resp = rqstp->rq_resp; | |
2995 | struct xdr_stream *xdr = &resp->xdr; | |
2996 | struct nfsd4_session *session; | |
2997 | struct nfs4_client *clp; | |
2998 | struct nfsd4_slot *slot; | |
2999 | struct nfsd4_conn *conn; | |
3000 | __be32 status; | |
3001 | int buflen; | |
3002 | struct net *net = SVC_NET(rqstp); | |
3003 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
3004 | ||
3005 | if (resp->opcnt != 1) | |
3006 | return nfserr_sequence_pos; | |
3007 | ||
3008 | /* | |
3009 | * Will be either used or freed by nfsd4_sequence_check_conn | |
3010 | * below. | |
3011 | */ | |
3012 | conn = alloc_conn(rqstp, NFS4_CDFC4_FORE); | |
3013 | if (!conn) | |
3014 | return nfserr_jukebox; | |
3015 | ||
3016 | spin_lock(&nn->client_lock); | |
3017 | session = find_in_sessionid_hashtbl(&seq->sessionid, net, &status); | |
3018 | if (!session) | |
3019 | goto out_no_session; | |
3020 | clp = session->se_client; | |
3021 | ||
3022 | status = nfserr_too_many_ops; | |
3023 | if (nfsd4_session_too_many_ops(rqstp, session)) | |
3024 | goto out_put_session; | |
3025 | ||
3026 | status = nfserr_req_too_big; | |
3027 | if (nfsd4_request_too_big(rqstp, session)) | |
3028 | goto out_put_session; | |
3029 | ||
3030 | status = nfserr_badslot; | |
3031 | if (seq->slotid >= session->se_fchannel.maxreqs) | |
3032 | goto out_put_session; | |
3033 | ||
3034 | slot = session->se_slots[seq->slotid]; | |
3035 | dprintk("%s: slotid %d\n", __func__, seq->slotid); | |
3036 | ||
3037 | /* We do not negotiate the number of slots yet, so set the | |
3038 | * maxslots to the session maxreqs which is used to encode | |
3039 | * sr_highest_slotid and the sr_target_slot id to maxslots */ | |
3040 | seq->maxslots = session->se_fchannel.maxreqs; | |
3041 | ||
3042 | status = check_slot_seqid(seq->seqid, slot->sl_seqid, | |
3043 | slot->sl_flags & NFSD4_SLOT_INUSE); | |
3044 | if (status == nfserr_replay_cache) { | |
3045 | status = nfserr_seq_misordered; | |
3046 | if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED)) | |
3047 | goto out_put_session; | |
3048 | cstate->slot = slot; | |
3049 | cstate->session = session; | |
3050 | cstate->clp = clp; | |
3051 | /* Return the cached reply status and set cstate->status | |
3052 | * for nfsd4_proc_compound processing */ | |
3053 | status = nfsd4_replay_cache_entry(resp, seq); | |
3054 | cstate->status = nfserr_replay_cache; | |
3055 | goto out; | |
3056 | } | |
3057 | if (status) | |
3058 | goto out_put_session; | |
3059 | ||
3060 | status = nfsd4_sequence_check_conn(conn, session); | |
3061 | conn = NULL; | |
3062 | if (status) | |
3063 | goto out_put_session; | |
3064 | ||
3065 | buflen = (seq->cachethis) ? | |
3066 | session->se_fchannel.maxresp_cached : | |
3067 | session->se_fchannel.maxresp_sz; | |
3068 | status = (seq->cachethis) ? nfserr_rep_too_big_to_cache : | |
3069 | nfserr_rep_too_big; | |
3070 | if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack)) | |
3071 | goto out_put_session; | |
3072 | svc_reserve(rqstp, buflen); | |
3073 | ||
3074 | status = nfs_ok; | |
3075 | /* Success! bump slot seqid */ | |
3076 | slot->sl_seqid = seq->seqid; | |
3077 | slot->sl_flags |= NFSD4_SLOT_INUSE; | |
3078 | if (seq->cachethis) | |
3079 | slot->sl_flags |= NFSD4_SLOT_CACHETHIS; | |
3080 | else | |
3081 | slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS; | |
3082 | ||
3083 | cstate->slot = slot; | |
3084 | cstate->session = session; | |
3085 | cstate->clp = clp; | |
3086 | ||
3087 | out: | |
3088 | switch (clp->cl_cb_state) { | |
3089 | case NFSD4_CB_DOWN: | |
3090 | seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN; | |
3091 | break; | |
3092 | case NFSD4_CB_FAULT: | |
3093 | seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT; | |
3094 | break; | |
3095 | default: | |
3096 | seq->status_flags = 0; | |
3097 | } | |
3098 | if (!list_empty(&clp->cl_revoked)) | |
3099 | seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED; | |
3100 | out_no_session: | |
3101 | if (conn) | |
3102 | free_conn(conn); | |
3103 | spin_unlock(&nn->client_lock); | |
3104 | return status; | |
3105 | out_put_session: | |
3106 | nfsd4_put_session_locked(session); | |
3107 | goto out_no_session; | |
3108 | } | |
3109 | ||
3110 | void | |
3111 | nfsd4_sequence_done(struct nfsd4_compoundres *resp) | |
3112 | { | |
3113 | struct nfsd4_compound_state *cs = &resp->cstate; | |
3114 | ||
3115 | if (nfsd4_has_session(cs)) { | |
3116 | if (cs->status != nfserr_replay_cache) { | |
3117 | nfsd4_store_cache_entry(resp); | |
3118 | cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE; | |
3119 | } | |
3120 | /* Drop session reference that was taken in nfsd4_sequence() */ | |
3121 | nfsd4_put_session(cs->session); | |
3122 | } else if (cs->clp) | |
3123 | put_client_renew(cs->clp); | |
3124 | } | |
3125 | ||
3126 | __be32 | |
3127 | nfsd4_destroy_clientid(struct svc_rqst *rqstp, | |
3128 | struct nfsd4_compound_state *cstate, | |
3129 | union nfsd4_op_u *u) | |
3130 | { | |
3131 | struct nfsd4_destroy_clientid *dc = &u->destroy_clientid; | |
3132 | struct nfs4_client *conf, *unconf; | |
3133 | struct nfs4_client *clp = NULL; | |
3134 | __be32 status = 0; | |
3135 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
3136 | ||
3137 | spin_lock(&nn->client_lock); | |
3138 | unconf = find_unconfirmed_client(&dc->clientid, true, nn); | |
3139 | conf = find_confirmed_client(&dc->clientid, true, nn); | |
3140 | WARN_ON_ONCE(conf && unconf); | |
3141 | ||
3142 | if (conf) { | |
3143 | if (client_has_state(conf)) { | |
3144 | status = nfserr_clientid_busy; | |
3145 | goto out; | |
3146 | } | |
3147 | status = mark_client_expired_locked(conf); | |
3148 | if (status) | |
3149 | goto out; | |
3150 | clp = conf; | |
3151 | } else if (unconf) | |
3152 | clp = unconf; | |
3153 | else { | |
3154 | status = nfserr_stale_clientid; | |
3155 | goto out; | |
3156 | } | |
3157 | if (!nfsd4_mach_creds_match(clp, rqstp)) { | |
3158 | clp = NULL; | |
3159 | status = nfserr_wrong_cred; | |
3160 | goto out; | |
3161 | } | |
3162 | unhash_client_locked(clp); | |
3163 | out: | |
3164 | spin_unlock(&nn->client_lock); | |
3165 | if (clp) | |
3166 | expire_client(clp); | |
3167 | return status; | |
3168 | } | |
3169 | ||
3170 | __be32 | |
3171 | nfsd4_reclaim_complete(struct svc_rqst *rqstp, | |
3172 | struct nfsd4_compound_state *cstate, union nfsd4_op_u *u) | |
3173 | { | |
3174 | struct nfsd4_reclaim_complete *rc = &u->reclaim_complete; | |
3175 | __be32 status = 0; | |
3176 | ||
3177 | if (rc->rca_one_fs) { | |
3178 | if (!cstate->current_fh.fh_dentry) | |
3179 | return nfserr_nofilehandle; | |
3180 | /* | |
3181 | * We don't take advantage of the rca_one_fs case. | |
3182 | * That's OK, it's optional, we can safely ignore it. | |
3183 | */ | |
3184 | return nfs_ok; | |
3185 | } | |
3186 | ||
3187 | status = nfserr_complete_already; | |
3188 | if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, | |
3189 | &cstate->session->se_client->cl_flags)) | |
3190 | goto out; | |
3191 | ||
3192 | status = nfserr_stale_clientid; | |
3193 | if (is_client_expired(cstate->session->se_client)) | |
3194 | /* | |
3195 | * The following error isn't really legal. | |
3196 | * But we only get here if the client just explicitly | |
3197 | * destroyed the client. Surely it no longer cares what | |
3198 | * error it gets back on an operation for the dead | |
3199 | * client. | |
3200 | */ | |
3201 | goto out; | |
3202 | ||
3203 | status = nfs_ok; | |
3204 | nfsd4_client_record_create(cstate->session->se_client); | |
3205 | out: | |
3206 | return status; | |
3207 | } | |
3208 | ||
3209 | __be32 | |
3210 | nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, | |
3211 | union nfsd4_op_u *u) | |
3212 | { | |
3213 | struct nfsd4_setclientid *setclid = &u->setclientid; | |
3214 | struct xdr_netobj clname = setclid->se_name; | |
3215 | nfs4_verifier clverifier = setclid->se_verf; | |
3216 | struct nfs4_client *conf, *new; | |
3217 | struct nfs4_client *unconf = NULL; | |
3218 | __be32 status; | |
3219 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
3220 | ||
3221 | new = create_client(clname, rqstp, &clverifier); | |
3222 | if (new == NULL) | |
3223 | return nfserr_jukebox; | |
3224 | /* Cases below refer to rfc 3530 section 14.2.33: */ | |
3225 | spin_lock(&nn->client_lock); | |
3226 | conf = find_confirmed_client_by_name(&clname, nn); | |
3227 | if (conf && client_has_state(conf)) { | |
3228 | /* case 0: */ | |
3229 | status = nfserr_clid_inuse; | |
3230 | if (clp_used_exchangeid(conf)) | |
3231 | goto out; | |
3232 | if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) { | |
3233 | char addr_str[INET6_ADDRSTRLEN]; | |
3234 | rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str, | |
3235 | sizeof(addr_str)); | |
3236 | dprintk("NFSD: setclientid: string in use by client " | |
3237 | "at %s\n", addr_str); | |
3238 | goto out; | |
3239 | } | |
3240 | } | |
3241 | unconf = find_unconfirmed_client_by_name(&clname, nn); | |
3242 | if (unconf) | |
3243 | unhash_client_locked(unconf); | |
3244 | if (conf && same_verf(&conf->cl_verifier, &clverifier)) { | |
3245 | /* case 1: probable callback update */ | |
3246 | copy_clid(new, conf); | |
3247 | gen_confirm(new, nn); | |
3248 | } else /* case 4 (new client) or cases 2, 3 (client reboot): */ | |
3249 | gen_clid(new, nn); | |
3250 | new->cl_minorversion = 0; | |
3251 | gen_callback(new, setclid, rqstp); | |
3252 | add_to_unconfirmed(new); | |
3253 | setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot; | |
3254 | setclid->se_clientid.cl_id = new->cl_clientid.cl_id; | |
3255 | memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data)); | |
3256 | new = NULL; | |
3257 | status = nfs_ok; | |
3258 | out: | |
3259 | spin_unlock(&nn->client_lock); | |
3260 | if (new) | |
3261 | free_client(new); | |
3262 | if (unconf) | |
3263 | expire_client(unconf); | |
3264 | return status; | |
3265 | } | |
3266 | ||
3267 | ||
3268 | __be32 | |
3269 | nfsd4_setclientid_confirm(struct svc_rqst *rqstp, | |
3270 | struct nfsd4_compound_state *cstate, | |
3271 | union nfsd4_op_u *u) | |
3272 | { | |
3273 | struct nfsd4_setclientid_confirm *setclientid_confirm = | |
3274 | &u->setclientid_confirm; | |
3275 | struct nfs4_client *conf, *unconf; | |
3276 | struct nfs4_client *old = NULL; | |
3277 | nfs4_verifier confirm = setclientid_confirm->sc_confirm; | |
3278 | clientid_t * clid = &setclientid_confirm->sc_clientid; | |
3279 | __be32 status; | |
3280 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
3281 | ||
3282 | if (STALE_CLIENTID(clid, nn)) | |
3283 | return nfserr_stale_clientid; | |
3284 | ||
3285 | spin_lock(&nn->client_lock); | |
3286 | conf = find_confirmed_client(clid, false, nn); | |
3287 | unconf = find_unconfirmed_client(clid, false, nn); | |
3288 | /* | |
3289 | * We try hard to give out unique clientid's, so if we get an | |
3290 | * attempt to confirm the same clientid with a different cred, | |
3291 | * the client may be buggy; this should never happen. | |
3292 | * | |
3293 | * Nevertheless, RFC 7530 recommends INUSE for this case: | |
3294 | */ | |
3295 | status = nfserr_clid_inuse; | |
3296 | if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred)) | |
3297 | goto out; | |
3298 | if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred)) | |
3299 | goto out; | |
3300 | /* cases below refer to rfc 3530 section 14.2.34: */ | |
3301 | if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) { | |
3302 | if (conf && same_verf(&confirm, &conf->cl_confirm)) { | |
3303 | /* case 2: probable retransmit */ | |
3304 | status = nfs_ok; | |
3305 | } else /* case 4: client hasn't noticed we rebooted yet? */ | |
3306 | status = nfserr_stale_clientid; | |
3307 | goto out; | |
3308 | } | |
3309 | status = nfs_ok; | |
3310 | if (conf) { /* case 1: callback update */ | |
3311 | old = unconf; | |
3312 | unhash_client_locked(old); | |
3313 | nfsd4_change_callback(conf, &unconf->cl_cb_conn); | |
3314 | } else { /* case 3: normal case; new or rebooted client */ | |
3315 | old = find_confirmed_client_by_name(&unconf->cl_name, nn); | |
3316 | if (old) { | |
3317 | status = nfserr_clid_inuse; | |
3318 | if (client_has_state(old) | |
3319 | && !same_creds(&unconf->cl_cred, | |
3320 | &old->cl_cred)) | |
3321 | goto out; | |
3322 | status = mark_client_expired_locked(old); | |
3323 | if (status) { | |
3324 | old = NULL; | |
3325 | goto out; | |
3326 | } | |
3327 | } | |
3328 | move_to_confirmed(unconf); | |
3329 | conf = unconf; | |
3330 | } | |
3331 | get_client_locked(conf); | |
3332 | spin_unlock(&nn->client_lock); | |
3333 | nfsd4_probe_callback(conf); | |
3334 | spin_lock(&nn->client_lock); | |
3335 | put_client_renew_locked(conf); | |
3336 | out: | |
3337 | spin_unlock(&nn->client_lock); | |
3338 | if (old) | |
3339 | expire_client(old); | |
3340 | return status; | |
3341 | } | |
3342 | ||
3343 | static struct nfs4_file *nfsd4_alloc_file(void) | |
3344 | { | |
3345 | return kmem_cache_alloc(file_slab, GFP_KERNEL); | |
3346 | } | |
3347 | ||
3348 | /* OPEN Share state helper functions */ | |
3349 | static void nfsd4_init_file(struct knfsd_fh *fh, unsigned int hashval, | |
3350 | struct nfs4_file *fp) | |
3351 | { | |
3352 | lockdep_assert_held(&state_lock); | |
3353 | ||
3354 | atomic_set(&fp->fi_ref, 1); | |
3355 | spin_lock_init(&fp->fi_lock); | |
3356 | INIT_LIST_HEAD(&fp->fi_stateids); | |
3357 | INIT_LIST_HEAD(&fp->fi_delegations); | |
3358 | INIT_LIST_HEAD(&fp->fi_clnt_odstate); | |
3359 | fh_copy_shallow(&fp->fi_fhandle, fh); | |
3360 | fp->fi_deleg_file = NULL; | |
3361 | fp->fi_had_conflict = false; | |
3362 | fp->fi_share_deny = 0; | |
3363 | memset(fp->fi_fds, 0, sizeof(fp->fi_fds)); | |
3364 | memset(fp->fi_access, 0, sizeof(fp->fi_access)); | |
3365 | #ifdef CONFIG_NFSD_PNFS | |
3366 | INIT_LIST_HEAD(&fp->fi_lo_states); | |
3367 | atomic_set(&fp->fi_lo_recalls, 0); | |
3368 | #endif | |
3369 | hlist_add_head_rcu(&fp->fi_hash, &file_hashtbl[hashval]); | |
3370 | } | |
3371 | ||
3372 | void | |
3373 | nfsd4_free_slabs(void) | |
3374 | { | |
3375 | kmem_cache_destroy(odstate_slab); | |
3376 | kmem_cache_destroy(openowner_slab); | |
3377 | kmem_cache_destroy(lockowner_slab); | |
3378 | kmem_cache_destroy(file_slab); | |
3379 | kmem_cache_destroy(stateid_slab); | |
3380 | kmem_cache_destroy(deleg_slab); | |
3381 | } | |
3382 | ||
3383 | int | |
3384 | nfsd4_init_slabs(void) | |
3385 | { | |
3386 | openowner_slab = kmem_cache_create("nfsd4_openowners", | |
3387 | sizeof(struct nfs4_openowner), 0, 0, NULL); | |
3388 | if (openowner_slab == NULL) | |
3389 | goto out; | |
3390 | lockowner_slab = kmem_cache_create("nfsd4_lockowners", | |
3391 | sizeof(struct nfs4_lockowner), 0, 0, NULL); | |
3392 | if (lockowner_slab == NULL) | |
3393 | goto out_free_openowner_slab; | |
3394 | file_slab = kmem_cache_create("nfsd4_files", | |
3395 | sizeof(struct nfs4_file), 0, 0, NULL); | |
3396 | if (file_slab == NULL) | |
3397 | goto out_free_lockowner_slab; | |
3398 | stateid_slab = kmem_cache_create("nfsd4_stateids", | |
3399 | sizeof(struct nfs4_ol_stateid), 0, 0, NULL); | |
3400 | if (stateid_slab == NULL) | |
3401 | goto out_free_file_slab; | |
3402 | deleg_slab = kmem_cache_create("nfsd4_delegations", | |
3403 | sizeof(struct nfs4_delegation), 0, 0, NULL); | |
3404 | if (deleg_slab == NULL) | |
3405 | goto out_free_stateid_slab; | |
3406 | odstate_slab = kmem_cache_create("nfsd4_odstate", | |
3407 | sizeof(struct nfs4_clnt_odstate), 0, 0, NULL); | |
3408 | if (odstate_slab == NULL) | |
3409 | goto out_free_deleg_slab; | |
3410 | return 0; | |
3411 | ||
3412 | out_free_deleg_slab: | |
3413 | kmem_cache_destroy(deleg_slab); | |
3414 | out_free_stateid_slab: | |
3415 | kmem_cache_destroy(stateid_slab); | |
3416 | out_free_file_slab: | |
3417 | kmem_cache_destroy(file_slab); | |
3418 | out_free_lockowner_slab: | |
3419 | kmem_cache_destroy(lockowner_slab); | |
3420 | out_free_openowner_slab: | |
3421 | kmem_cache_destroy(openowner_slab); | |
3422 | out: | |
3423 | dprintk("nfsd4: out of memory while initializing nfsv4\n"); | |
3424 | return -ENOMEM; | |
3425 | } | |
3426 | ||
3427 | static void init_nfs4_replay(struct nfs4_replay *rp) | |
3428 | { | |
3429 | rp->rp_status = nfserr_serverfault; | |
3430 | rp->rp_buflen = 0; | |
3431 | rp->rp_buf = rp->rp_ibuf; | |
3432 | mutex_init(&rp->rp_mutex); | |
3433 | } | |
3434 | ||
3435 | static void nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate, | |
3436 | struct nfs4_stateowner *so) | |
3437 | { | |
3438 | if (!nfsd4_has_session(cstate)) { | |
3439 | mutex_lock(&so->so_replay.rp_mutex); | |
3440 | cstate->replay_owner = nfs4_get_stateowner(so); | |
3441 | } | |
3442 | } | |
3443 | ||
3444 | void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate) | |
3445 | { | |
3446 | struct nfs4_stateowner *so = cstate->replay_owner; | |
3447 | ||
3448 | if (so != NULL) { | |
3449 | cstate->replay_owner = NULL; | |
3450 | mutex_unlock(&so->so_replay.rp_mutex); | |
3451 | nfs4_put_stateowner(so); | |
3452 | } | |
3453 | } | |
3454 | ||
3455 | static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp) | |
3456 | { | |
3457 | struct nfs4_stateowner *sop; | |
3458 | ||
3459 | sop = kmem_cache_alloc(slab, GFP_KERNEL); | |
3460 | if (!sop) | |
3461 | return NULL; | |
3462 | ||
3463 | sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL); | |
3464 | if (!sop->so_owner.data) { | |
3465 | kmem_cache_free(slab, sop); | |
3466 | return NULL; | |
3467 | } | |
3468 | sop->so_owner.len = owner->len; | |
3469 | ||
3470 | INIT_LIST_HEAD(&sop->so_stateids); | |
3471 | sop->so_client = clp; | |
3472 | init_nfs4_replay(&sop->so_replay); | |
3473 | atomic_set(&sop->so_count, 1); | |
3474 | return sop; | |
3475 | } | |
3476 | ||
3477 | static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval) | |
3478 | { | |
3479 | lockdep_assert_held(&clp->cl_lock); | |
3480 | ||
3481 | list_add(&oo->oo_owner.so_strhash, | |
3482 | &clp->cl_ownerstr_hashtbl[strhashval]); | |
3483 | list_add(&oo->oo_perclient, &clp->cl_openowners); | |
3484 | } | |
3485 | ||
3486 | static void nfs4_unhash_openowner(struct nfs4_stateowner *so) | |
3487 | { | |
3488 | unhash_openowner_locked(openowner(so)); | |
3489 | } | |
3490 | ||
3491 | static void nfs4_free_openowner(struct nfs4_stateowner *so) | |
3492 | { | |
3493 | struct nfs4_openowner *oo = openowner(so); | |
3494 | ||
3495 | kmem_cache_free(openowner_slab, oo); | |
3496 | } | |
3497 | ||
3498 | static const struct nfs4_stateowner_operations openowner_ops = { | |
3499 | .so_unhash = nfs4_unhash_openowner, | |
3500 | .so_free = nfs4_free_openowner, | |
3501 | }; | |
3502 | ||
3503 | static struct nfs4_ol_stateid * | |
3504 | nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open) | |
3505 | { | |
3506 | struct nfs4_ol_stateid *local, *ret = NULL; | |
3507 | struct nfs4_openowner *oo = open->op_openowner; | |
3508 | ||
3509 | lockdep_assert_held(&fp->fi_lock); | |
3510 | ||
3511 | list_for_each_entry(local, &fp->fi_stateids, st_perfile) { | |
3512 | /* ignore lock owners */ | |
3513 | if (local->st_stateowner->so_is_open_owner == 0) | |
3514 | continue; | |
3515 | if (local->st_stateowner == &oo->oo_owner) { | |
3516 | ret = local; | |
3517 | atomic_inc(&ret->st_stid.sc_count); | |
3518 | break; | |
3519 | } | |
3520 | } | |
3521 | return ret; | |
3522 | } | |
3523 | ||
3524 | static struct nfs4_openowner * | |
3525 | alloc_init_open_stateowner(unsigned int strhashval, struct nfsd4_open *open, | |
3526 | struct nfsd4_compound_state *cstate) | |
3527 | { | |
3528 | struct nfs4_client *clp = cstate->clp; | |
3529 | struct nfs4_openowner *oo, *ret; | |
3530 | ||
3531 | oo = alloc_stateowner(openowner_slab, &open->op_owner, clp); | |
3532 | if (!oo) | |
3533 | return NULL; | |
3534 | oo->oo_owner.so_ops = &openowner_ops; | |
3535 | oo->oo_owner.so_is_open_owner = 1; | |
3536 | oo->oo_owner.so_seqid = open->op_seqid; | |
3537 | oo->oo_flags = 0; | |
3538 | if (nfsd4_has_session(cstate)) | |
3539 | oo->oo_flags |= NFS4_OO_CONFIRMED; | |
3540 | oo->oo_time = 0; | |
3541 | oo->oo_last_closed_stid = NULL; | |
3542 | INIT_LIST_HEAD(&oo->oo_close_lru); | |
3543 | spin_lock(&clp->cl_lock); | |
3544 | ret = find_openstateowner_str_locked(strhashval, open, clp); | |
3545 | if (ret == NULL) { | |
3546 | hash_openowner(oo, clp, strhashval); | |
3547 | ret = oo; | |
3548 | } else | |
3549 | nfs4_free_stateowner(&oo->oo_owner); | |
3550 | ||
3551 | spin_unlock(&clp->cl_lock); | |
3552 | return ret; | |
3553 | } | |
3554 | ||
3555 | static struct nfs4_ol_stateid * | |
3556 | init_open_stateid(struct nfs4_file *fp, struct nfsd4_open *open) | |
3557 | { | |
3558 | ||
3559 | struct nfs4_openowner *oo = open->op_openowner; | |
3560 | struct nfs4_ol_stateid *retstp = NULL; | |
3561 | struct nfs4_ol_stateid *stp; | |
3562 | ||
3563 | stp = open->op_stp; | |
3564 | /* We are moving these outside of the spinlocks to avoid the warnings */ | |
3565 | mutex_init(&stp->st_mutex); | |
3566 | mutex_lock(&stp->st_mutex); | |
3567 | ||
3568 | spin_lock(&oo->oo_owner.so_client->cl_lock); | |
3569 | spin_lock(&fp->fi_lock); | |
3570 | ||
3571 | retstp = nfsd4_find_existing_open(fp, open); | |
3572 | if (retstp) | |
3573 | goto out_unlock; | |
3574 | ||
3575 | open->op_stp = NULL; | |
3576 | atomic_inc(&stp->st_stid.sc_count); | |
3577 | stp->st_stid.sc_type = NFS4_OPEN_STID; | |
3578 | INIT_LIST_HEAD(&stp->st_locks); | |
3579 | stp->st_stateowner = nfs4_get_stateowner(&oo->oo_owner); | |
3580 | get_nfs4_file(fp); | |
3581 | stp->st_stid.sc_file = fp; | |
3582 | stp->st_access_bmap = 0; | |
3583 | stp->st_deny_bmap = 0; | |
3584 | stp->st_openstp = NULL; | |
3585 | list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids); | |
3586 | list_add(&stp->st_perfile, &fp->fi_stateids); | |
3587 | ||
3588 | out_unlock: | |
3589 | spin_unlock(&fp->fi_lock); | |
3590 | spin_unlock(&oo->oo_owner.so_client->cl_lock); | |
3591 | if (retstp) { | |
3592 | mutex_lock(&retstp->st_mutex); | |
3593 | /* To keep mutex tracking happy */ | |
3594 | mutex_unlock(&stp->st_mutex); | |
3595 | stp = retstp; | |
3596 | } | |
3597 | return stp; | |
3598 | } | |
3599 | ||
3600 | /* | |
3601 | * In the 4.0 case we need to keep the owners around a little while to handle | |
3602 | * CLOSE replay. We still do need to release any file access that is held by | |
3603 | * them before returning however. | |
3604 | */ | |
3605 | static void | |
3606 | move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net) | |
3607 | { | |
3608 | struct nfs4_ol_stateid *last; | |
3609 | struct nfs4_openowner *oo = openowner(s->st_stateowner); | |
3610 | struct nfsd_net *nn = net_generic(s->st_stid.sc_client->net, | |
3611 | nfsd_net_id); | |
3612 | ||
3613 | dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo); | |
3614 | ||
3615 | /* | |
3616 | * We know that we hold one reference via nfsd4_close, and another | |
3617 | * "persistent" reference for the client. If the refcount is higher | |
3618 | * than 2, then there are still calls in progress that are using this | |
3619 | * stateid. We can't put the sc_file reference until they are finished. | |
3620 | * Wait for the refcount to drop to 2. Since it has been unhashed, | |
3621 | * there should be no danger of the refcount going back up again at | |
3622 | * this point. | |
3623 | */ | |
3624 | wait_event(close_wq, atomic_read(&s->st_stid.sc_count) == 2); | |
3625 | ||
3626 | release_all_access(s); | |
3627 | if (s->st_stid.sc_file) { | |
3628 | put_nfs4_file(s->st_stid.sc_file); | |
3629 | s->st_stid.sc_file = NULL; | |
3630 | } | |
3631 | ||
3632 | spin_lock(&nn->client_lock); | |
3633 | last = oo->oo_last_closed_stid; | |
3634 | oo->oo_last_closed_stid = s; | |
3635 | list_move_tail(&oo->oo_close_lru, &nn->close_lru); | |
3636 | oo->oo_time = get_seconds(); | |
3637 | spin_unlock(&nn->client_lock); | |
3638 | if (last) | |
3639 | nfs4_put_stid(&last->st_stid); | |
3640 | } | |
3641 | ||
3642 | /* search file_hashtbl[] for file */ | |
3643 | static struct nfs4_file * | |
3644 | find_file_locked(struct knfsd_fh *fh, unsigned int hashval) | |
3645 | { | |
3646 | struct nfs4_file *fp; | |
3647 | ||
3648 | hlist_for_each_entry_rcu(fp, &file_hashtbl[hashval], fi_hash) { | |
3649 | if (fh_match(&fp->fi_fhandle, fh)) { | |
3650 | if (atomic_inc_not_zero(&fp->fi_ref)) | |
3651 | return fp; | |
3652 | } | |
3653 | } | |
3654 | return NULL; | |
3655 | } | |
3656 | ||
3657 | struct nfs4_file * | |
3658 | find_file(struct knfsd_fh *fh) | |
3659 | { | |
3660 | struct nfs4_file *fp; | |
3661 | unsigned int hashval = file_hashval(fh); | |
3662 | ||
3663 | rcu_read_lock(); | |
3664 | fp = find_file_locked(fh, hashval); | |
3665 | rcu_read_unlock(); | |
3666 | return fp; | |
3667 | } | |
3668 | ||
3669 | static struct nfs4_file * | |
3670 | find_or_add_file(struct nfs4_file *new, struct knfsd_fh *fh) | |
3671 | { | |
3672 | struct nfs4_file *fp; | |
3673 | unsigned int hashval = file_hashval(fh); | |
3674 | ||
3675 | rcu_read_lock(); | |
3676 | fp = find_file_locked(fh, hashval); | |
3677 | rcu_read_unlock(); | |
3678 | if (fp) | |
3679 | return fp; | |
3680 | ||
3681 | spin_lock(&state_lock); | |
3682 | fp = find_file_locked(fh, hashval); | |
3683 | if (likely(fp == NULL)) { | |
3684 | nfsd4_init_file(fh, hashval, new); | |
3685 | fp = new; | |
3686 | } | |
3687 | spin_unlock(&state_lock); | |
3688 | ||
3689 | return fp; | |
3690 | } | |
3691 | ||
3692 | /* | |
3693 | * Called to check deny when READ with all zero stateid or | |
3694 | * WRITE with all zero or all one stateid | |
3695 | */ | |
3696 | static __be32 | |
3697 | nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type) | |
3698 | { | |
3699 | struct nfs4_file *fp; | |
3700 | __be32 ret = nfs_ok; | |
3701 | ||
3702 | fp = find_file(¤t_fh->fh_handle); | |
3703 | if (!fp) | |
3704 | return ret; | |
3705 | /* Check for conflicting share reservations */ | |
3706 | spin_lock(&fp->fi_lock); | |
3707 | if (fp->fi_share_deny & deny_type) | |
3708 | ret = nfserr_locked; | |
3709 | spin_unlock(&fp->fi_lock); | |
3710 | put_nfs4_file(fp); | |
3711 | return ret; | |
3712 | } | |
3713 | ||
3714 | static void nfsd4_cb_recall_prepare(struct nfsd4_callback *cb) | |
3715 | { | |
3716 | struct nfs4_delegation *dp = cb_to_delegation(cb); | |
3717 | struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net, | |
3718 | nfsd_net_id); | |
3719 | ||
3720 | block_delegations(&dp->dl_stid.sc_file->fi_fhandle); | |
3721 | ||
3722 | /* | |
3723 | * We can't do this in nfsd_break_deleg_cb because it is | |
3724 | * already holding inode->i_lock. | |
3725 | * | |
3726 | * If the dl_time != 0, then we know that it has already been | |
3727 | * queued for a lease break. Don't queue it again. | |
3728 | */ | |
3729 | spin_lock(&state_lock); | |
3730 | if (dp->dl_time == 0) { | |
3731 | dp->dl_time = get_seconds(); | |
3732 | list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru); | |
3733 | } | |
3734 | spin_unlock(&state_lock); | |
3735 | } | |
3736 | ||
3737 | static int nfsd4_cb_recall_done(struct nfsd4_callback *cb, | |
3738 | struct rpc_task *task) | |
3739 | { | |
3740 | struct nfs4_delegation *dp = cb_to_delegation(cb); | |
3741 | ||
3742 | if (dp->dl_stid.sc_type == NFS4_CLOSED_DELEG_STID) | |
3743 | return 1; | |
3744 | ||
3745 | switch (task->tk_status) { | |
3746 | case 0: | |
3747 | return 1; | |
3748 | case -EBADHANDLE: | |
3749 | case -NFS4ERR_BAD_STATEID: | |
3750 | /* | |
3751 | * Race: client probably got cb_recall before open reply | |
3752 | * granting delegation. | |
3753 | */ | |
3754 | if (dp->dl_retries--) { | |
3755 | rpc_delay(task, 2 * HZ); | |
3756 | return 0; | |
3757 | } | |
3758 | /*FALLTHRU*/ | |
3759 | default: | |
3760 | return -1; | |
3761 | } | |
3762 | } | |
3763 | ||
3764 | static void nfsd4_cb_recall_release(struct nfsd4_callback *cb) | |
3765 | { | |
3766 | struct nfs4_delegation *dp = cb_to_delegation(cb); | |
3767 | ||
3768 | nfs4_put_stid(&dp->dl_stid); | |
3769 | } | |
3770 | ||
3771 | static const struct nfsd4_callback_ops nfsd4_cb_recall_ops = { | |
3772 | .prepare = nfsd4_cb_recall_prepare, | |
3773 | .done = nfsd4_cb_recall_done, | |
3774 | .release = nfsd4_cb_recall_release, | |
3775 | }; | |
3776 | ||
3777 | static void nfsd_break_one_deleg(struct nfs4_delegation *dp) | |
3778 | { | |
3779 | /* | |
3780 | * We're assuming the state code never drops its reference | |
3781 | * without first removing the lease. Since we're in this lease | |
3782 | * callback (and since the lease code is serialized by the kernel | |
3783 | * lock) we know the server hasn't removed the lease yet, we know | |
3784 | * it's safe to take a reference. | |
3785 | */ | |
3786 | atomic_inc(&dp->dl_stid.sc_count); | |
3787 | nfsd4_run_cb(&dp->dl_recall); | |
3788 | } | |
3789 | ||
3790 | /* Called from break_lease() with i_lock held. */ | |
3791 | static bool | |
3792 | nfsd_break_deleg_cb(struct file_lock *fl) | |
3793 | { | |
3794 | bool ret = false; | |
3795 | struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner; | |
3796 | struct nfs4_delegation *dp; | |
3797 | ||
3798 | if (!fp) { | |
3799 | WARN(1, "(%p)->fl_owner NULL\n", fl); | |
3800 | return ret; | |
3801 | } | |
3802 | if (fp->fi_had_conflict) { | |
3803 | WARN(1, "duplicate break on %p\n", fp); | |
3804 | return ret; | |
3805 | } | |
3806 | /* | |
3807 | * We don't want the locks code to timeout the lease for us; | |
3808 | * we'll remove it ourself if a delegation isn't returned | |
3809 | * in time: | |
3810 | */ | |
3811 | fl->fl_break_time = 0; | |
3812 | ||
3813 | spin_lock(&fp->fi_lock); | |
3814 | fp->fi_had_conflict = true; | |
3815 | /* | |
3816 | * If there are no delegations on the list, then return true | |
3817 | * so that the lease code will go ahead and delete it. | |
3818 | */ | |
3819 | if (list_empty(&fp->fi_delegations)) | |
3820 | ret = true; | |
3821 | else | |
3822 | list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) | |
3823 | nfsd_break_one_deleg(dp); | |
3824 | spin_unlock(&fp->fi_lock); | |
3825 | return ret; | |
3826 | } | |
3827 | ||
3828 | static int | |
3829 | nfsd_change_deleg_cb(struct file_lock *onlist, int arg, | |
3830 | struct list_head *dispose) | |
3831 | { | |
3832 | if (arg & F_UNLCK) | |
3833 | return lease_modify(onlist, arg, dispose); | |
3834 | else | |
3835 | return -EAGAIN; | |
3836 | } | |
3837 | ||
3838 | static const struct lock_manager_operations nfsd_lease_mng_ops = { | |
3839 | .lm_break = nfsd_break_deleg_cb, | |
3840 | .lm_change = nfsd_change_deleg_cb, | |
3841 | }; | |
3842 | ||
3843 | static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid) | |
3844 | { | |
3845 | if (nfsd4_has_session(cstate)) | |
3846 | return nfs_ok; | |
3847 | if (seqid == so->so_seqid - 1) | |
3848 | return nfserr_replay_me; | |
3849 | if (seqid == so->so_seqid) | |
3850 | return nfs_ok; | |
3851 | return nfserr_bad_seqid; | |
3852 | } | |
3853 | ||
3854 | static __be32 lookup_clientid(clientid_t *clid, | |
3855 | struct nfsd4_compound_state *cstate, | |
3856 | struct nfsd_net *nn) | |
3857 | { | |
3858 | struct nfs4_client *found; | |
3859 | ||
3860 | if (cstate->clp) { | |
3861 | found = cstate->clp; | |
3862 | if (!same_clid(&found->cl_clientid, clid)) | |
3863 | return nfserr_stale_clientid; | |
3864 | return nfs_ok; | |
3865 | } | |
3866 | ||
3867 | if (STALE_CLIENTID(clid, nn)) | |
3868 | return nfserr_stale_clientid; | |
3869 | ||
3870 | /* | |
3871 | * For v4.1+ we get the client in the SEQUENCE op. If we don't have one | |
3872 | * cached already then we know this is for is for v4.0 and "sessions" | |
3873 | * will be false. | |
3874 | */ | |
3875 | WARN_ON_ONCE(cstate->session); | |
3876 | spin_lock(&nn->client_lock); | |
3877 | found = find_confirmed_client(clid, false, nn); | |
3878 | if (!found) { | |
3879 | spin_unlock(&nn->client_lock); | |
3880 | return nfserr_expired; | |
3881 | } | |
3882 | atomic_inc(&found->cl_refcount); | |
3883 | spin_unlock(&nn->client_lock); | |
3884 | ||
3885 | /* Cache the nfs4_client in cstate! */ | |
3886 | cstate->clp = found; | |
3887 | return nfs_ok; | |
3888 | } | |
3889 | ||
3890 | __be32 | |
3891 | nfsd4_process_open1(struct nfsd4_compound_state *cstate, | |
3892 | struct nfsd4_open *open, struct nfsd_net *nn) | |
3893 | { | |
3894 | clientid_t *clientid = &open->op_clientid; | |
3895 | struct nfs4_client *clp = NULL; | |
3896 | unsigned int strhashval; | |
3897 | struct nfs4_openowner *oo = NULL; | |
3898 | __be32 status; | |
3899 | ||
3900 | if (STALE_CLIENTID(&open->op_clientid, nn)) | |
3901 | return nfserr_stale_clientid; | |
3902 | /* | |
3903 | * In case we need it later, after we've already created the | |
3904 | * file and don't want to risk a further failure: | |
3905 | */ | |
3906 | open->op_file = nfsd4_alloc_file(); | |
3907 | if (open->op_file == NULL) | |
3908 | return nfserr_jukebox; | |
3909 | ||
3910 | status = lookup_clientid(clientid, cstate, nn); | |
3911 | if (status) | |
3912 | return status; | |
3913 | clp = cstate->clp; | |
3914 | ||
3915 | strhashval = ownerstr_hashval(&open->op_owner); | |
3916 | oo = find_openstateowner_str(strhashval, open, clp); | |
3917 | open->op_openowner = oo; | |
3918 | if (!oo) { | |
3919 | goto new_owner; | |
3920 | } | |
3921 | if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) { | |
3922 | /* Replace unconfirmed owners without checking for replay. */ | |
3923 | release_openowner(oo); | |
3924 | open->op_openowner = NULL; | |
3925 | goto new_owner; | |
3926 | } | |
3927 | status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid); | |
3928 | if (status) | |
3929 | return status; | |
3930 | goto alloc_stateid; | |
3931 | new_owner: | |
3932 | oo = alloc_init_open_stateowner(strhashval, open, cstate); | |
3933 | if (oo == NULL) | |
3934 | return nfserr_jukebox; | |
3935 | open->op_openowner = oo; | |
3936 | alloc_stateid: | |
3937 | open->op_stp = nfs4_alloc_open_stateid(clp); | |
3938 | if (!open->op_stp) | |
3939 | return nfserr_jukebox; | |
3940 | ||
3941 | if (nfsd4_has_session(cstate) && | |
3942 | (cstate->current_fh.fh_export->ex_flags & NFSEXP_PNFS)) { | |
3943 | open->op_odstate = alloc_clnt_odstate(clp); | |
3944 | if (!open->op_odstate) | |
3945 | return nfserr_jukebox; | |
3946 | } | |
3947 | ||
3948 | return nfs_ok; | |
3949 | } | |
3950 | ||
3951 | static inline __be32 | |
3952 | nfs4_check_delegmode(struct nfs4_delegation *dp, int flags) | |
3953 | { | |
3954 | if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ)) | |
3955 | return nfserr_openmode; | |
3956 | else | |
3957 | return nfs_ok; | |
3958 | } | |
3959 | ||
3960 | static int share_access_to_flags(u32 share_access) | |
3961 | { | |
3962 | return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE; | |
3963 | } | |
3964 | ||
3965 | static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s) | |
3966 | { | |
3967 | struct nfs4_stid *ret; | |
3968 | ||
3969 | ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID); | |
3970 | if (!ret) | |
3971 | return NULL; | |
3972 | return delegstateid(ret); | |
3973 | } | |
3974 | ||
3975 | static bool nfsd4_is_deleg_cur(struct nfsd4_open *open) | |
3976 | { | |
3977 | return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR || | |
3978 | open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH; | |
3979 | } | |
3980 | ||
3981 | static __be32 | |
3982 | nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open, | |
3983 | struct nfs4_delegation **dp) | |
3984 | { | |
3985 | int flags; | |
3986 | __be32 status = nfserr_bad_stateid; | |
3987 | struct nfs4_delegation *deleg; | |
3988 | ||
3989 | deleg = find_deleg_stateid(cl, &open->op_delegate_stateid); | |
3990 | if (deleg == NULL) | |
3991 | goto out; | |
3992 | flags = share_access_to_flags(open->op_share_access); | |
3993 | status = nfs4_check_delegmode(deleg, flags); | |
3994 | if (status) { | |
3995 | nfs4_put_stid(&deleg->dl_stid); | |
3996 | goto out; | |
3997 | } | |
3998 | *dp = deleg; | |
3999 | out: | |
4000 | if (!nfsd4_is_deleg_cur(open)) | |
4001 | return nfs_ok; | |
4002 | if (status) | |
4003 | return status; | |
4004 | open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED; | |
4005 | return nfs_ok; | |
4006 | } | |
4007 | ||
4008 | static inline int nfs4_access_to_access(u32 nfs4_access) | |
4009 | { | |
4010 | int flags = 0; | |
4011 | ||
4012 | if (nfs4_access & NFS4_SHARE_ACCESS_READ) | |
4013 | flags |= NFSD_MAY_READ; | |
4014 | if (nfs4_access & NFS4_SHARE_ACCESS_WRITE) | |
4015 | flags |= NFSD_MAY_WRITE; | |
4016 | return flags; | |
4017 | } | |
4018 | ||
4019 | static inline __be32 | |
4020 | nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh, | |
4021 | struct nfsd4_open *open) | |
4022 | { | |
4023 | struct iattr iattr = { | |
4024 | .ia_valid = ATTR_SIZE, | |
4025 | .ia_size = 0, | |
4026 | }; | |
4027 | if (!open->op_truncate) | |
4028 | return 0; | |
4029 | if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE)) | |
4030 | return nfserr_inval; | |
4031 | return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0); | |
4032 | } | |
4033 | ||
4034 | static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp, | |
4035 | struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp, | |
4036 | struct nfsd4_open *open) | |
4037 | { | |
4038 | struct file *filp = NULL; | |
4039 | __be32 status; | |
4040 | int oflag = nfs4_access_to_omode(open->op_share_access); | |
4041 | int access = nfs4_access_to_access(open->op_share_access); | |
4042 | unsigned char old_access_bmap, old_deny_bmap; | |
4043 | ||
4044 | spin_lock(&fp->fi_lock); | |
4045 | ||
4046 | /* | |
4047 | * Are we trying to set a deny mode that would conflict with | |
4048 | * current access? | |
4049 | */ | |
4050 | status = nfs4_file_check_deny(fp, open->op_share_deny); | |
4051 | if (status != nfs_ok) { | |
4052 | spin_unlock(&fp->fi_lock); | |
4053 | goto out; | |
4054 | } | |
4055 | ||
4056 | /* set access to the file */ | |
4057 | status = nfs4_file_get_access(fp, open->op_share_access); | |
4058 | if (status != nfs_ok) { | |
4059 | spin_unlock(&fp->fi_lock); | |
4060 | goto out; | |
4061 | } | |
4062 | ||
4063 | /* Set access bits in stateid */ | |
4064 | old_access_bmap = stp->st_access_bmap; | |
4065 | set_access(open->op_share_access, stp); | |
4066 | ||
4067 | /* Set new deny mask */ | |
4068 | old_deny_bmap = stp->st_deny_bmap; | |
4069 | set_deny(open->op_share_deny, stp); | |
4070 | fp->fi_share_deny |= (open->op_share_deny & NFS4_SHARE_DENY_BOTH); | |
4071 | ||
4072 | if (!fp->fi_fds[oflag]) { | |
4073 | spin_unlock(&fp->fi_lock); | |
4074 | status = nfsd_open(rqstp, cur_fh, S_IFREG, access, &filp); | |
4075 | if (status) | |
4076 | goto out_put_access; | |
4077 | spin_lock(&fp->fi_lock); | |
4078 | if (!fp->fi_fds[oflag]) { | |
4079 | fp->fi_fds[oflag] = filp; | |
4080 | filp = NULL; | |
4081 | } | |
4082 | } | |
4083 | spin_unlock(&fp->fi_lock); | |
4084 | if (filp) | |
4085 | fput(filp); | |
4086 | ||
4087 | status = nfsd4_truncate(rqstp, cur_fh, open); | |
4088 | if (status) | |
4089 | goto out_put_access; | |
4090 | out: | |
4091 | return status; | |
4092 | out_put_access: | |
4093 | stp->st_access_bmap = old_access_bmap; | |
4094 | nfs4_file_put_access(fp, open->op_share_access); | |
4095 | reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap), stp); | |
4096 | goto out; | |
4097 | } | |
4098 | ||
4099 | static __be32 | |
4100 | 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) | |
4101 | { | |
4102 | __be32 status; | |
4103 | unsigned char old_deny_bmap = stp->st_deny_bmap; | |
4104 | ||
4105 | if (!test_access(open->op_share_access, stp)) | |
4106 | return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open); | |
4107 | ||
4108 | /* test and set deny mode */ | |
4109 | spin_lock(&fp->fi_lock); | |
4110 | status = nfs4_file_check_deny(fp, open->op_share_deny); | |
4111 | if (status == nfs_ok) { | |
4112 | set_deny(open->op_share_deny, stp); | |
4113 | fp->fi_share_deny |= | |
4114 | (open->op_share_deny & NFS4_SHARE_DENY_BOTH); | |
4115 | } | |
4116 | spin_unlock(&fp->fi_lock); | |
4117 | ||
4118 | if (status != nfs_ok) | |
4119 | return status; | |
4120 | ||
4121 | status = nfsd4_truncate(rqstp, cur_fh, open); | |
4122 | if (status != nfs_ok) | |
4123 | reset_union_bmap_deny(old_deny_bmap, stp); | |
4124 | return status; | |
4125 | } | |
4126 | ||
4127 | /* Should we give out recallable state?: */ | |
4128 | static bool nfsd4_cb_channel_good(struct nfs4_client *clp) | |
4129 | { | |
4130 | if (clp->cl_cb_state == NFSD4_CB_UP) | |
4131 | return true; | |
4132 | /* | |
4133 | * In the sessions case, since we don't have to establish a | |
4134 | * separate connection for callbacks, we assume it's OK | |
4135 | * until we hear otherwise: | |
4136 | */ | |
4137 | return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN; | |
4138 | } | |
4139 | ||
4140 | static struct file_lock *nfs4_alloc_init_lease(struct nfs4_file *fp, int flag) | |
4141 | { | |
4142 | struct file_lock *fl; | |
4143 | ||
4144 | fl = locks_alloc_lock(); | |
4145 | if (!fl) | |
4146 | return NULL; | |
4147 | fl->fl_lmops = &nfsd_lease_mng_ops; | |
4148 | fl->fl_flags = FL_DELEG; | |
4149 | fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK; | |
4150 | fl->fl_end = OFFSET_MAX; | |
4151 | fl->fl_owner = (fl_owner_t)fp; | |
4152 | fl->fl_pid = current->tgid; | |
4153 | return fl; | |
4154 | } | |
4155 | ||
4156 | /** | |
4157 | * nfs4_setlease - Obtain a delegation by requesting lease from vfs layer | |
4158 | * @dp: a pointer to the nfs4_delegation we're adding. | |
4159 | * | |
4160 | * Return: | |
4161 | * On success: Return code will be 0 on success. | |
4162 | * | |
4163 | * On error: -EAGAIN if there was an existing delegation. | |
4164 | * nonzero if there is an error in other cases. | |
4165 | * | |
4166 | */ | |
4167 | ||
4168 | static int nfs4_setlease(struct nfs4_delegation *dp) | |
4169 | { | |
4170 | struct nfs4_file *fp = dp->dl_stid.sc_file; | |
4171 | struct file_lock *fl; | |
4172 | struct file *filp; | |
4173 | int status = 0; | |
4174 | ||
4175 | fl = nfs4_alloc_init_lease(fp, NFS4_OPEN_DELEGATE_READ); | |
4176 | if (!fl) | |
4177 | return -ENOMEM; | |
4178 | filp = find_readable_file(fp); | |
4179 | if (!filp) { | |
4180 | /* We should always have a readable file here */ | |
4181 | WARN_ON_ONCE(1); | |
4182 | locks_free_lock(fl); | |
4183 | return -EBADF; | |
4184 | } | |
4185 | fl->fl_file = filp; | |
4186 | status = vfs_setlease(filp, fl->fl_type, &fl, NULL); | |
4187 | if (fl) | |
4188 | locks_free_lock(fl); | |
4189 | if (status) | |
4190 | goto out_fput; | |
4191 | spin_lock(&state_lock); | |
4192 | spin_lock(&fp->fi_lock); | |
4193 | /* Did the lease get broken before we took the lock? */ | |
4194 | status = -EAGAIN; | |
4195 | if (fp->fi_had_conflict) | |
4196 | goto out_unlock; | |
4197 | /* Race breaker */ | |
4198 | if (fp->fi_deleg_file) { | |
4199 | status = hash_delegation_locked(dp, fp); | |
4200 | goto out_unlock; | |
4201 | } | |
4202 | fp->fi_deleg_file = filp; | |
4203 | fp->fi_delegees = 0; | |
4204 | status = hash_delegation_locked(dp, fp); | |
4205 | spin_unlock(&fp->fi_lock); | |
4206 | spin_unlock(&state_lock); | |
4207 | if (status) { | |
4208 | /* Should never happen, this is a new fi_deleg_file */ | |
4209 | WARN_ON_ONCE(1); | |
4210 | goto out_fput; | |
4211 | } | |
4212 | return 0; | |
4213 | out_unlock: | |
4214 | spin_unlock(&fp->fi_lock); | |
4215 | spin_unlock(&state_lock); | |
4216 | out_fput: | |
4217 | fput(filp); | |
4218 | return status; | |
4219 | } | |
4220 | ||
4221 | static struct nfs4_delegation * | |
4222 | nfs4_set_delegation(struct nfs4_client *clp, struct svc_fh *fh, | |
4223 | struct nfs4_file *fp, struct nfs4_clnt_odstate *odstate) | |
4224 | { | |
4225 | int status; | |
4226 | struct nfs4_delegation *dp; | |
4227 | ||
4228 | if (fp->fi_had_conflict) | |
4229 | return ERR_PTR(-EAGAIN); | |
4230 | ||
4231 | spin_lock(&state_lock); | |
4232 | spin_lock(&fp->fi_lock); | |
4233 | status = nfs4_get_existing_delegation(clp, fp); | |
4234 | spin_unlock(&fp->fi_lock); | |
4235 | spin_unlock(&state_lock); | |
4236 | ||
4237 | if (status) | |
4238 | return ERR_PTR(status); | |
4239 | ||
4240 | dp = alloc_init_deleg(clp, fh, odstate); | |
4241 | if (!dp) | |
4242 | return ERR_PTR(-ENOMEM); | |
4243 | ||
4244 | get_nfs4_file(fp); | |
4245 | spin_lock(&state_lock); | |
4246 | spin_lock(&fp->fi_lock); | |
4247 | dp->dl_stid.sc_file = fp; | |
4248 | if (!fp->fi_deleg_file) { | |
4249 | spin_unlock(&fp->fi_lock); | |
4250 | spin_unlock(&state_lock); | |
4251 | status = nfs4_setlease(dp); | |
4252 | goto out; | |
4253 | } | |
4254 | if (fp->fi_had_conflict) { | |
4255 | status = -EAGAIN; | |
4256 | goto out_unlock; | |
4257 | } | |
4258 | status = hash_delegation_locked(dp, fp); | |
4259 | out_unlock: | |
4260 | spin_unlock(&fp->fi_lock); | |
4261 | spin_unlock(&state_lock); | |
4262 | out: | |
4263 | if (status) { | |
4264 | put_clnt_odstate(dp->dl_clnt_odstate); | |
4265 | nfs4_put_stid(&dp->dl_stid); | |
4266 | return ERR_PTR(status); | |
4267 | } | |
4268 | return dp; | |
4269 | } | |
4270 | ||
4271 | static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status) | |
4272 | { | |
4273 | open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT; | |
4274 | if (status == -EAGAIN) | |
4275 | open->op_why_no_deleg = WND4_CONTENTION; | |
4276 | else { | |
4277 | open->op_why_no_deleg = WND4_RESOURCE; | |
4278 | switch (open->op_deleg_want) { | |
4279 | case NFS4_SHARE_WANT_READ_DELEG: | |
4280 | case NFS4_SHARE_WANT_WRITE_DELEG: | |
4281 | case NFS4_SHARE_WANT_ANY_DELEG: | |
4282 | break; | |
4283 | case NFS4_SHARE_WANT_CANCEL: | |
4284 | open->op_why_no_deleg = WND4_CANCELLED; | |
4285 | break; | |
4286 | case NFS4_SHARE_WANT_NO_DELEG: | |
4287 | WARN_ON_ONCE(1); | |
4288 | } | |
4289 | } | |
4290 | } | |
4291 | ||
4292 | /* | |
4293 | * Attempt to hand out a delegation. | |
4294 | * | |
4295 | * Note we don't support write delegations, and won't until the vfs has | |
4296 | * proper support for them. | |
4297 | */ | |
4298 | static void | |
4299 | nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, | |
4300 | struct nfs4_ol_stateid *stp) | |
4301 | { | |
4302 | struct nfs4_delegation *dp; | |
4303 | struct nfs4_openowner *oo = openowner(stp->st_stateowner); | |
4304 | struct nfs4_client *clp = stp->st_stid.sc_client; | |
4305 | int cb_up; | |
4306 | int status = 0; | |
4307 | ||
4308 | cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client); | |
4309 | open->op_recall = 0; | |
4310 | switch (open->op_claim_type) { | |
4311 | case NFS4_OPEN_CLAIM_PREVIOUS: | |
4312 | if (!cb_up) | |
4313 | open->op_recall = 1; | |
4314 | if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ) | |
4315 | goto out_no_deleg; | |
4316 | break; | |
4317 | case NFS4_OPEN_CLAIM_NULL: | |
4318 | case NFS4_OPEN_CLAIM_FH: | |
4319 | /* | |
4320 | * Let's not give out any delegations till everyone's | |
4321 | * had the chance to reclaim theirs, *and* until | |
4322 | * NLM locks have all been reclaimed: | |
4323 | */ | |
4324 | if (locks_in_grace(clp->net)) | |
4325 | goto out_no_deleg; | |
4326 | if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED)) | |
4327 | goto out_no_deleg; | |
4328 | /* | |
4329 | * Also, if the file was opened for write or | |
4330 | * create, there's a good chance the client's | |
4331 | * about to write to it, resulting in an | |
4332 | * immediate recall (since we don't support | |
4333 | * write delegations): | |
4334 | */ | |
4335 | if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) | |
4336 | goto out_no_deleg; | |
4337 | if (open->op_create == NFS4_OPEN_CREATE) | |
4338 | goto out_no_deleg; | |
4339 | break; | |
4340 | default: | |
4341 | goto out_no_deleg; | |
4342 | } | |
4343 | dp = nfs4_set_delegation(clp, fh, stp->st_stid.sc_file, stp->st_clnt_odstate); | |
4344 | if (IS_ERR(dp)) | |
4345 | goto out_no_deleg; | |
4346 | ||
4347 | memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid)); | |
4348 | ||
4349 | dprintk("NFSD: delegation stateid=" STATEID_FMT "\n", | |
4350 | STATEID_VAL(&dp->dl_stid.sc_stateid)); | |
4351 | open->op_delegate_type = NFS4_OPEN_DELEGATE_READ; | |
4352 | nfs4_put_stid(&dp->dl_stid); | |
4353 | return; | |
4354 | out_no_deleg: | |
4355 | open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE; | |
4356 | if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS && | |
4357 | open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) { | |
4358 | dprintk("NFSD: WARNING: refusing delegation reclaim\n"); | |
4359 | open->op_recall = 1; | |
4360 | } | |
4361 | ||
4362 | /* 4.1 client asking for a delegation? */ | |
4363 | if (open->op_deleg_want) | |
4364 | nfsd4_open_deleg_none_ext(open, status); | |
4365 | return; | |
4366 | } | |
4367 | ||
4368 | static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open, | |
4369 | struct nfs4_delegation *dp) | |
4370 | { | |
4371 | if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG && | |
4372 | dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) { | |
4373 | open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT; | |
4374 | open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE; | |
4375 | } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG && | |
4376 | dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) { | |
4377 | open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT; | |
4378 | open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE; | |
4379 | } | |
4380 | /* Otherwise the client must be confused wanting a delegation | |
4381 | * it already has, therefore we don't return | |
4382 | * NFS4_OPEN_DELEGATE_NONE_EXT and reason. | |
4383 | */ | |
4384 | } | |
4385 | ||
4386 | __be32 | |
4387 | nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open) | |
4388 | { | |
4389 | struct nfsd4_compoundres *resp = rqstp->rq_resp; | |
4390 | struct nfs4_client *cl = open->op_openowner->oo_owner.so_client; | |
4391 | struct nfs4_file *fp = NULL; | |
4392 | struct nfs4_ol_stateid *stp = NULL; | |
4393 | struct nfs4_delegation *dp = NULL; | |
4394 | __be32 status; | |
4395 | ||
4396 | /* | |
4397 | * Lookup file; if found, lookup stateid and check open request, | |
4398 | * and check for delegations in the process of being recalled. | |
4399 | * If not found, create the nfs4_file struct | |
4400 | */ | |
4401 | fp = find_or_add_file(open->op_file, ¤t_fh->fh_handle); | |
4402 | if (fp != open->op_file) { | |
4403 | status = nfs4_check_deleg(cl, open, &dp); | |
4404 | if (status) | |
4405 | goto out; | |
4406 | spin_lock(&fp->fi_lock); | |
4407 | stp = nfsd4_find_existing_open(fp, open); | |
4408 | spin_unlock(&fp->fi_lock); | |
4409 | } else { | |
4410 | open->op_file = NULL; | |
4411 | status = nfserr_bad_stateid; | |
4412 | if (nfsd4_is_deleg_cur(open)) | |
4413 | goto out; | |
4414 | } | |
4415 | ||
4416 | /* | |
4417 | * OPEN the file, or upgrade an existing OPEN. | |
4418 | * If truncate fails, the OPEN fails. | |
4419 | */ | |
4420 | if (stp) { | |
4421 | /* Stateid was found, this is an OPEN upgrade */ | |
4422 | mutex_lock(&stp->st_mutex); | |
4423 | status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open); | |
4424 | if (status) { | |
4425 | mutex_unlock(&stp->st_mutex); | |
4426 | goto out; | |
4427 | } | |
4428 | } else { | |
4429 | /* stp is returned locked. */ | |
4430 | stp = init_open_stateid(fp, open); | |
4431 | /* See if we lost the race to some other thread */ | |
4432 | if (stp->st_access_bmap != 0) { | |
4433 | status = nfs4_upgrade_open(rqstp, fp, current_fh, | |
4434 | stp, open); | |
4435 | if (status) { | |
4436 | mutex_unlock(&stp->st_mutex); | |
4437 | goto out; | |
4438 | } | |
4439 | goto upgrade_out; | |
4440 | } | |
4441 | status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open); | |
4442 | if (status) { | |
4443 | mutex_unlock(&stp->st_mutex); | |
4444 | release_open_stateid(stp); | |
4445 | goto out; | |
4446 | } | |
4447 | ||
4448 | stp->st_clnt_odstate = find_or_hash_clnt_odstate(fp, | |
4449 | open->op_odstate); | |
4450 | if (stp->st_clnt_odstate == open->op_odstate) | |
4451 | open->op_odstate = NULL; | |
4452 | } | |
4453 | upgrade_out: | |
4454 | nfs4_inc_and_copy_stateid(&open->op_stateid, &stp->st_stid); | |
4455 | mutex_unlock(&stp->st_mutex); | |
4456 | ||
4457 | if (nfsd4_has_session(&resp->cstate)) { | |
4458 | if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) { | |
4459 | open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT; | |
4460 | open->op_why_no_deleg = WND4_NOT_WANTED; | |
4461 | goto nodeleg; | |
4462 | } | |
4463 | } | |
4464 | ||
4465 | /* | |
4466 | * Attempt to hand out a delegation. No error return, because the | |
4467 | * OPEN succeeds even if we fail. | |
4468 | */ | |
4469 | nfs4_open_delegation(current_fh, open, stp); | |
4470 | nodeleg: | |
4471 | status = nfs_ok; | |
4472 | ||
4473 | dprintk("%s: stateid=" STATEID_FMT "\n", __func__, | |
4474 | STATEID_VAL(&stp->st_stid.sc_stateid)); | |
4475 | out: | |
4476 | /* 4.1 client trying to upgrade/downgrade delegation? */ | |
4477 | if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp && | |
4478 | open->op_deleg_want) | |
4479 | nfsd4_deleg_xgrade_none_ext(open, dp); | |
4480 | ||
4481 | if (fp) | |
4482 | put_nfs4_file(fp); | |
4483 | if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) | |
4484 | open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED; | |
4485 | /* | |
4486 | * To finish the open response, we just need to set the rflags. | |
4487 | */ | |
4488 | open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX; | |
4489 | if (nfsd4_has_session(&resp->cstate)) | |
4490 | open->op_rflags |= NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK; | |
4491 | else if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED)) | |
4492 | open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM; | |
4493 | ||
4494 | if (dp) | |
4495 | nfs4_put_stid(&dp->dl_stid); | |
4496 | if (stp) | |
4497 | nfs4_put_stid(&stp->st_stid); | |
4498 | ||
4499 | return status; | |
4500 | } | |
4501 | ||
4502 | void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate, | |
4503 | struct nfsd4_open *open) | |
4504 | { | |
4505 | if (open->op_openowner) { | |
4506 | struct nfs4_stateowner *so = &open->op_openowner->oo_owner; | |
4507 | ||
4508 | nfsd4_cstate_assign_replay(cstate, so); | |
4509 | nfs4_put_stateowner(so); | |
4510 | } | |
4511 | if (open->op_file) | |
4512 | kmem_cache_free(file_slab, open->op_file); | |
4513 | if (open->op_stp) | |
4514 | nfs4_put_stid(&open->op_stp->st_stid); | |
4515 | if (open->op_odstate) | |
4516 | kmem_cache_free(odstate_slab, open->op_odstate); | |
4517 | } | |
4518 | ||
4519 | __be32 | |
4520 | nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, | |
4521 | union nfsd4_op_u *u) | |
4522 | { | |
4523 | clientid_t *clid = &u->renew; | |
4524 | struct nfs4_client *clp; | |
4525 | __be32 status; | |
4526 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
4527 | ||
4528 | dprintk("process_renew(%08x/%08x): starting\n", | |
4529 | clid->cl_boot, clid->cl_id); | |
4530 | status = lookup_clientid(clid, cstate, nn); | |
4531 | if (status) | |
4532 | goto out; | |
4533 | clp = cstate->clp; | |
4534 | status = nfserr_cb_path_down; | |
4535 | if (!list_empty(&clp->cl_delegations) | |
4536 | && clp->cl_cb_state != NFSD4_CB_UP) | |
4537 | goto out; | |
4538 | status = nfs_ok; | |
4539 | out: | |
4540 | return status; | |
4541 | } | |
4542 | ||
4543 | void | |
4544 | nfsd4_end_grace(struct nfsd_net *nn) | |
4545 | { | |
4546 | /* do nothing if grace period already ended */ | |
4547 | if (nn->grace_ended) | |
4548 | return; | |
4549 | ||
4550 | dprintk("NFSD: end of grace period\n"); | |
4551 | nn->grace_ended = true; | |
4552 | /* | |
4553 | * If the server goes down again right now, an NFSv4 | |
4554 | * client will still be allowed to reclaim after it comes back up, | |
4555 | * even if it hasn't yet had a chance to reclaim state this time. | |
4556 | * | |
4557 | */ | |
4558 | nfsd4_record_grace_done(nn); | |
4559 | /* | |
4560 | * At this point, NFSv4 clients can still reclaim. But if the | |
4561 | * server crashes, any that have not yet reclaimed will be out | |
4562 | * of luck on the next boot. | |
4563 | * | |
4564 | * (NFSv4.1+ clients are considered to have reclaimed once they | |
4565 | * call RECLAIM_COMPLETE. NFSv4.0 clients are considered to | |
4566 | * have reclaimed after their first OPEN.) | |
4567 | */ | |
4568 | locks_end_grace(&nn->nfsd4_manager); | |
4569 | /* | |
4570 | * At this point, and once lockd and/or any other containers | |
4571 | * exit their grace period, further reclaims will fail and | |
4572 | * regular locking can resume. | |
4573 | */ | |
4574 | } | |
4575 | ||
4576 | static time_t | |
4577 | nfs4_laundromat(struct nfsd_net *nn) | |
4578 | { | |
4579 | struct nfs4_client *clp; | |
4580 | struct nfs4_openowner *oo; | |
4581 | struct nfs4_delegation *dp; | |
4582 | struct nfs4_ol_stateid *stp; | |
4583 | struct nfsd4_blocked_lock *nbl; | |
4584 | struct list_head *pos, *next, reaplist; | |
4585 | time_t cutoff = get_seconds() - nn->nfsd4_lease; | |
4586 | time_t t, new_timeo = nn->nfsd4_lease; | |
4587 | ||
4588 | dprintk("NFSD: laundromat service - starting\n"); | |
4589 | nfsd4_end_grace(nn); | |
4590 | INIT_LIST_HEAD(&reaplist); | |
4591 | spin_lock(&nn->client_lock); | |
4592 | list_for_each_safe(pos, next, &nn->client_lru) { | |
4593 | clp = list_entry(pos, struct nfs4_client, cl_lru); | |
4594 | if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) { | |
4595 | t = clp->cl_time - cutoff; | |
4596 | new_timeo = min(new_timeo, t); | |
4597 | break; | |
4598 | } | |
4599 | if (mark_client_expired_locked(clp)) { | |
4600 | dprintk("NFSD: client in use (clientid %08x)\n", | |
4601 | clp->cl_clientid.cl_id); | |
4602 | continue; | |
4603 | } | |
4604 | list_add(&clp->cl_lru, &reaplist); | |
4605 | } | |
4606 | spin_unlock(&nn->client_lock); | |
4607 | list_for_each_safe(pos, next, &reaplist) { | |
4608 | clp = list_entry(pos, struct nfs4_client, cl_lru); | |
4609 | dprintk("NFSD: purging unused client (clientid %08x)\n", | |
4610 | clp->cl_clientid.cl_id); | |
4611 | list_del_init(&clp->cl_lru); | |
4612 | expire_client(clp); | |
4613 | } | |
4614 | spin_lock(&state_lock); | |
4615 | list_for_each_safe(pos, next, &nn->del_recall_lru) { | |
4616 | dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); | |
4617 | if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) { | |
4618 | t = dp->dl_time - cutoff; | |
4619 | new_timeo = min(new_timeo, t); | |
4620 | break; | |
4621 | } | |
4622 | WARN_ON(!unhash_delegation_locked(dp)); | |
4623 | list_add(&dp->dl_recall_lru, &reaplist); | |
4624 | } | |
4625 | spin_unlock(&state_lock); | |
4626 | while (!list_empty(&reaplist)) { | |
4627 | dp = list_first_entry(&reaplist, struct nfs4_delegation, | |
4628 | dl_recall_lru); | |
4629 | list_del_init(&dp->dl_recall_lru); | |
4630 | revoke_delegation(dp); | |
4631 | } | |
4632 | ||
4633 | spin_lock(&nn->client_lock); | |
4634 | while (!list_empty(&nn->close_lru)) { | |
4635 | oo = list_first_entry(&nn->close_lru, struct nfs4_openowner, | |
4636 | oo_close_lru); | |
4637 | if (time_after((unsigned long)oo->oo_time, | |
4638 | (unsigned long)cutoff)) { | |
4639 | t = oo->oo_time - cutoff; | |
4640 | new_timeo = min(new_timeo, t); | |
4641 | break; | |
4642 | } | |
4643 | list_del_init(&oo->oo_close_lru); | |
4644 | stp = oo->oo_last_closed_stid; | |
4645 | oo->oo_last_closed_stid = NULL; | |
4646 | spin_unlock(&nn->client_lock); | |
4647 | nfs4_put_stid(&stp->st_stid); | |
4648 | spin_lock(&nn->client_lock); | |
4649 | } | |
4650 | spin_unlock(&nn->client_lock); | |
4651 | ||
4652 | /* | |
4653 | * It's possible for a client to try and acquire an already held lock | |
4654 | * that is being held for a long time, and then lose interest in it. | |
4655 | * So, we clean out any un-revisited request after a lease period | |
4656 | * under the assumption that the client is no longer interested. | |
4657 | * | |
4658 | * RFC5661, sec. 9.6 states that the client must not rely on getting | |
4659 | * notifications and must continue to poll for locks, even when the | |
4660 | * server supports them. Thus this shouldn't lead to clients blocking | |
4661 | * indefinitely once the lock does become free. | |
4662 | */ | |
4663 | BUG_ON(!list_empty(&reaplist)); | |
4664 | spin_lock(&nn->blocked_locks_lock); | |
4665 | while (!list_empty(&nn->blocked_locks_lru)) { | |
4666 | nbl = list_first_entry(&nn->blocked_locks_lru, | |
4667 | struct nfsd4_blocked_lock, nbl_lru); | |
4668 | if (time_after((unsigned long)nbl->nbl_time, | |
4669 | (unsigned long)cutoff)) { | |
4670 | t = nbl->nbl_time - cutoff; | |
4671 | new_timeo = min(new_timeo, t); | |
4672 | break; | |
4673 | } | |
4674 | list_move(&nbl->nbl_lru, &reaplist); | |
4675 | list_del_init(&nbl->nbl_list); | |
4676 | } | |
4677 | spin_unlock(&nn->blocked_locks_lock); | |
4678 | ||
4679 | while (!list_empty(&reaplist)) { | |
4680 | nbl = list_first_entry(&nn->blocked_locks_lru, | |
4681 | struct nfsd4_blocked_lock, nbl_lru); | |
4682 | list_del_init(&nbl->nbl_lru); | |
4683 | posix_unblock_lock(&nbl->nbl_lock); | |
4684 | free_blocked_lock(nbl); | |
4685 | } | |
4686 | ||
4687 | new_timeo = max_t(time_t, new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT); | |
4688 | return new_timeo; | |
4689 | } | |
4690 | ||
4691 | static struct workqueue_struct *laundry_wq; | |
4692 | static void laundromat_main(struct work_struct *); | |
4693 | ||
4694 | static void | |
4695 | laundromat_main(struct work_struct *laundry) | |
4696 | { | |
4697 | time_t t; | |
4698 | struct delayed_work *dwork = to_delayed_work(laundry); | |
4699 | struct nfsd_net *nn = container_of(dwork, struct nfsd_net, | |
4700 | laundromat_work); | |
4701 | ||
4702 | t = nfs4_laundromat(nn); | |
4703 | dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t); | |
4704 | queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ); | |
4705 | } | |
4706 | ||
4707 | static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp) | |
4708 | { | |
4709 | if (!fh_match(&fhp->fh_handle, &stp->sc_file->fi_fhandle)) | |
4710 | return nfserr_bad_stateid; | |
4711 | return nfs_ok; | |
4712 | } | |
4713 | ||
4714 | static inline int | |
4715 | access_permit_read(struct nfs4_ol_stateid *stp) | |
4716 | { | |
4717 | return test_access(NFS4_SHARE_ACCESS_READ, stp) || | |
4718 | test_access(NFS4_SHARE_ACCESS_BOTH, stp) || | |
4719 | test_access(NFS4_SHARE_ACCESS_WRITE, stp); | |
4720 | } | |
4721 | ||
4722 | static inline int | |
4723 | access_permit_write(struct nfs4_ol_stateid *stp) | |
4724 | { | |
4725 | return test_access(NFS4_SHARE_ACCESS_WRITE, stp) || | |
4726 | test_access(NFS4_SHARE_ACCESS_BOTH, stp); | |
4727 | } | |
4728 | ||
4729 | static | |
4730 | __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags) | |
4731 | { | |
4732 | __be32 status = nfserr_openmode; | |
4733 | ||
4734 | /* For lock stateid's, we test the parent open, not the lock: */ | |
4735 | if (stp->st_openstp) | |
4736 | stp = stp->st_openstp; | |
4737 | if ((flags & WR_STATE) && !access_permit_write(stp)) | |
4738 | goto out; | |
4739 | if ((flags & RD_STATE) && !access_permit_read(stp)) | |
4740 | goto out; | |
4741 | status = nfs_ok; | |
4742 | out: | |
4743 | return status; | |
4744 | } | |
4745 | ||
4746 | static inline __be32 | |
4747 | check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags) | |
4748 | { | |
4749 | if (ONE_STATEID(stateid) && (flags & RD_STATE)) | |
4750 | return nfs_ok; | |
4751 | else if (opens_in_grace(net)) { | |
4752 | /* Answer in remaining cases depends on existence of | |
4753 | * conflicting state; so we must wait out the grace period. */ | |
4754 | return nfserr_grace; | |
4755 | } else if (flags & WR_STATE) | |
4756 | return nfs4_share_conflict(current_fh, | |
4757 | NFS4_SHARE_DENY_WRITE); | |
4758 | else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */ | |
4759 | return nfs4_share_conflict(current_fh, | |
4760 | NFS4_SHARE_DENY_READ); | |
4761 | } | |
4762 | ||
4763 | /* | |
4764 | * Allow READ/WRITE during grace period on recovered state only for files | |
4765 | * that are not able to provide mandatory locking. | |
4766 | */ | |
4767 | static inline int | |
4768 | grace_disallows_io(struct net *net, struct inode *inode) | |
4769 | { | |
4770 | return opens_in_grace(net) && mandatory_lock(inode); | |
4771 | } | |
4772 | ||
4773 | static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session) | |
4774 | { | |
4775 | /* | |
4776 | * When sessions are used the stateid generation number is ignored | |
4777 | * when it is zero. | |
4778 | */ | |
4779 | if (has_session && in->si_generation == 0) | |
4780 | return nfs_ok; | |
4781 | ||
4782 | if (in->si_generation == ref->si_generation) | |
4783 | return nfs_ok; | |
4784 | ||
4785 | /* If the client sends us a stateid from the future, it's buggy: */ | |
4786 | if (nfsd4_stateid_generation_after(in, ref)) | |
4787 | return nfserr_bad_stateid; | |
4788 | /* | |
4789 | * However, we could see a stateid from the past, even from a | |
4790 | * non-buggy client. For example, if the client sends a lock | |
4791 | * while some IO is outstanding, the lock may bump si_generation | |
4792 | * while the IO is still in flight. The client could avoid that | |
4793 | * situation by waiting for responses on all the IO requests, | |
4794 | * but better performance may result in retrying IO that | |
4795 | * receives an old_stateid error if requests are rarely | |
4796 | * reordered in flight: | |
4797 | */ | |
4798 | return nfserr_old_stateid; | |
4799 | } | |
4800 | ||
4801 | static __be32 nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid *ols) | |
4802 | { | |
4803 | if (ols->st_stateowner->so_is_open_owner && | |
4804 | !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED)) | |
4805 | return nfserr_bad_stateid; | |
4806 | return nfs_ok; | |
4807 | } | |
4808 | ||
4809 | static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid) | |
4810 | { | |
4811 | struct nfs4_stid *s; | |
4812 | __be32 status = nfserr_bad_stateid; | |
4813 | ||
4814 | if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) | |
4815 | return status; | |
4816 | /* Client debugging aid. */ | |
4817 | if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) { | |
4818 | char addr_str[INET6_ADDRSTRLEN]; | |
4819 | rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str, | |
4820 | sizeof(addr_str)); | |
4821 | pr_warn_ratelimited("NFSD: client %s testing state ID " | |
4822 | "with incorrect client ID\n", addr_str); | |
4823 | return status; | |
4824 | } | |
4825 | spin_lock(&cl->cl_lock); | |
4826 | s = find_stateid_locked(cl, stateid); | |
4827 | if (!s) | |
4828 | goto out_unlock; | |
4829 | status = check_stateid_generation(stateid, &s->sc_stateid, 1); | |
4830 | if (status) | |
4831 | goto out_unlock; | |
4832 | switch (s->sc_type) { | |
4833 | case NFS4_DELEG_STID: | |
4834 | status = nfs_ok; | |
4835 | break; | |
4836 | case NFS4_REVOKED_DELEG_STID: | |
4837 | status = nfserr_deleg_revoked; | |
4838 | break; | |
4839 | case NFS4_OPEN_STID: | |
4840 | case NFS4_LOCK_STID: | |
4841 | status = nfsd4_check_openowner_confirmed(openlockstateid(s)); | |
4842 | break; | |
4843 | default: | |
4844 | printk("unknown stateid type %x\n", s->sc_type); | |
4845 | /* Fallthrough */ | |
4846 | case NFS4_CLOSED_STID: | |
4847 | case NFS4_CLOSED_DELEG_STID: | |
4848 | status = nfserr_bad_stateid; | |
4849 | } | |
4850 | out_unlock: | |
4851 | spin_unlock(&cl->cl_lock); | |
4852 | return status; | |
4853 | } | |
4854 | ||
4855 | __be32 | |
4856 | nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate, | |
4857 | stateid_t *stateid, unsigned char typemask, | |
4858 | struct nfs4_stid **s, struct nfsd_net *nn) | |
4859 | { | |
4860 | __be32 status; | |
4861 | ||
4862 | if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) | |
4863 | return nfserr_bad_stateid; | |
4864 | status = lookup_clientid(&stateid->si_opaque.so_clid, cstate, nn); | |
4865 | if (status == nfserr_stale_clientid) { | |
4866 | if (cstate->session) | |
4867 | return nfserr_bad_stateid; | |
4868 | return nfserr_stale_stateid; | |
4869 | } | |
4870 | if (status) | |
4871 | return status; | |
4872 | *s = find_stateid_by_type(cstate->clp, stateid, typemask); | |
4873 | if (!*s) | |
4874 | return nfserr_bad_stateid; | |
4875 | return nfs_ok; | |
4876 | } | |
4877 | ||
4878 | static struct file * | |
4879 | nfs4_find_file(struct nfs4_stid *s, int flags) | |
4880 | { | |
4881 | if (!s) | |
4882 | return NULL; | |
4883 | ||
4884 | switch (s->sc_type) { | |
4885 | case NFS4_DELEG_STID: | |
4886 | if (WARN_ON_ONCE(!s->sc_file->fi_deleg_file)) | |
4887 | return NULL; | |
4888 | return get_file(s->sc_file->fi_deleg_file); | |
4889 | case NFS4_OPEN_STID: | |
4890 | case NFS4_LOCK_STID: | |
4891 | if (flags & RD_STATE) | |
4892 | return find_readable_file(s->sc_file); | |
4893 | else | |
4894 | return find_writeable_file(s->sc_file); | |
4895 | break; | |
4896 | } | |
4897 | ||
4898 | return NULL; | |
4899 | } | |
4900 | ||
4901 | static __be32 | |
4902 | nfs4_check_olstateid(struct svc_fh *fhp, struct nfs4_ol_stateid *ols, int flags) | |
4903 | { | |
4904 | __be32 status; | |
4905 | ||
4906 | status = nfsd4_check_openowner_confirmed(ols); | |
4907 | if (status) | |
4908 | return status; | |
4909 | return nfs4_check_openmode(ols, flags); | |
4910 | } | |
4911 | ||
4912 | static __be32 | |
4913 | nfs4_check_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfs4_stid *s, | |
4914 | struct file **filpp, bool *tmp_file, int flags) | |
4915 | { | |
4916 | int acc = (flags & RD_STATE) ? NFSD_MAY_READ : NFSD_MAY_WRITE; | |
4917 | struct file *file; | |
4918 | __be32 status; | |
4919 | ||
4920 | file = nfs4_find_file(s, flags); | |
4921 | if (file) { | |
4922 | status = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, | |
4923 | acc | NFSD_MAY_OWNER_OVERRIDE); | |
4924 | if (status) { | |
4925 | fput(file); | |
4926 | return status; | |
4927 | } | |
4928 | ||
4929 | *filpp = file; | |
4930 | } else { | |
4931 | status = nfsd_open(rqstp, fhp, S_IFREG, acc, filpp); | |
4932 | if (status) | |
4933 | return status; | |
4934 | ||
4935 | if (tmp_file) | |
4936 | *tmp_file = true; | |
4937 | } | |
4938 | ||
4939 | return 0; | |
4940 | } | |
4941 | ||
4942 | /* | |
4943 | * Checks for stateid operations | |
4944 | */ | |
4945 | __be32 | |
4946 | nfs4_preprocess_stateid_op(struct svc_rqst *rqstp, | |
4947 | struct nfsd4_compound_state *cstate, struct svc_fh *fhp, | |
4948 | stateid_t *stateid, int flags, struct file **filpp, bool *tmp_file) | |
4949 | { | |
4950 | struct inode *ino = d_inode(fhp->fh_dentry); | |
4951 | struct net *net = SVC_NET(rqstp); | |
4952 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
4953 | struct nfs4_stid *s = NULL; | |
4954 | __be32 status; | |
4955 | ||
4956 | if (filpp) | |
4957 | *filpp = NULL; | |
4958 | if (tmp_file) | |
4959 | *tmp_file = false; | |
4960 | ||
4961 | if (grace_disallows_io(net, ino)) | |
4962 | return nfserr_grace; | |
4963 | ||
4964 | if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) { | |
4965 | status = check_special_stateids(net, fhp, stateid, flags); | |
4966 | goto done; | |
4967 | } | |
4968 | ||
4969 | status = nfsd4_lookup_stateid(cstate, stateid, | |
4970 | NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID, | |
4971 | &s, nn); | |
4972 | if (status) | |
4973 | return status; | |
4974 | status = check_stateid_generation(stateid, &s->sc_stateid, | |
4975 | nfsd4_has_session(cstate)); | |
4976 | if (status) | |
4977 | goto out; | |
4978 | ||
4979 | switch (s->sc_type) { | |
4980 | case NFS4_DELEG_STID: | |
4981 | status = nfs4_check_delegmode(delegstateid(s), flags); | |
4982 | break; | |
4983 | case NFS4_OPEN_STID: | |
4984 | case NFS4_LOCK_STID: | |
4985 | status = nfs4_check_olstateid(fhp, openlockstateid(s), flags); | |
4986 | break; | |
4987 | default: | |
4988 | status = nfserr_bad_stateid; | |
4989 | break; | |
4990 | } | |
4991 | if (status) | |
4992 | goto out; | |
4993 | status = nfs4_check_fh(fhp, s); | |
4994 | ||
4995 | done: | |
4996 | if (!status && filpp) | |
4997 | status = nfs4_check_file(rqstp, fhp, s, filpp, tmp_file, flags); | |
4998 | out: | |
4999 | if (s) | |
5000 | nfs4_put_stid(s); | |
5001 | return status; | |
5002 | } | |
5003 | ||
5004 | /* | |
5005 | * Test if the stateid is valid | |
5006 | */ | |
5007 | __be32 | |
5008 | nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, | |
5009 | union nfsd4_op_u *u) | |
5010 | { | |
5011 | struct nfsd4_test_stateid *test_stateid = &u->test_stateid; | |
5012 | struct nfsd4_test_stateid_id *stateid; | |
5013 | struct nfs4_client *cl = cstate->session->se_client; | |
5014 | ||
5015 | list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list) | |
5016 | stateid->ts_id_status = | |
5017 | nfsd4_validate_stateid(cl, &stateid->ts_id_stateid); | |
5018 | ||
5019 | return nfs_ok; | |
5020 | } | |
5021 | ||
5022 | static __be32 | |
5023 | nfsd4_free_lock_stateid(stateid_t *stateid, struct nfs4_stid *s) | |
5024 | { | |
5025 | struct nfs4_ol_stateid *stp = openlockstateid(s); | |
5026 | __be32 ret; | |
5027 | ||
5028 | mutex_lock(&stp->st_mutex); | |
5029 | ||
5030 | ret = check_stateid_generation(stateid, &s->sc_stateid, 1); | |
5031 | if (ret) | |
5032 | goto out; | |
5033 | ||
5034 | ret = nfserr_locks_held; | |
5035 | if (check_for_locks(stp->st_stid.sc_file, | |
5036 | lockowner(stp->st_stateowner))) | |
5037 | goto out; | |
5038 | ||
5039 | release_lock_stateid(stp); | |
5040 | ret = nfs_ok; | |
5041 | ||
5042 | out: | |
5043 | mutex_unlock(&stp->st_mutex); | |
5044 | nfs4_put_stid(s); | |
5045 | return ret; | |
5046 | } | |
5047 | ||
5048 | __be32 | |
5049 | nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, | |
5050 | union nfsd4_op_u *u) | |
5051 | { | |
5052 | struct nfsd4_free_stateid *free_stateid = &u->free_stateid; | |
5053 | stateid_t *stateid = &free_stateid->fr_stateid; | |
5054 | struct nfs4_stid *s; | |
5055 | struct nfs4_delegation *dp; | |
5056 | struct nfs4_client *cl = cstate->session->se_client; | |
5057 | __be32 ret = nfserr_bad_stateid; | |
5058 | ||
5059 | spin_lock(&cl->cl_lock); | |
5060 | s = find_stateid_locked(cl, stateid); | |
5061 | if (!s) | |
5062 | goto out_unlock; | |
5063 | switch (s->sc_type) { | |
5064 | case NFS4_DELEG_STID: | |
5065 | ret = nfserr_locks_held; | |
5066 | break; | |
5067 | case NFS4_OPEN_STID: | |
5068 | ret = check_stateid_generation(stateid, &s->sc_stateid, 1); | |
5069 | if (ret) | |
5070 | break; | |
5071 | ret = nfserr_locks_held; | |
5072 | break; | |
5073 | case NFS4_LOCK_STID: | |
5074 | atomic_inc(&s->sc_count); | |
5075 | spin_unlock(&cl->cl_lock); | |
5076 | ret = nfsd4_free_lock_stateid(stateid, s); | |
5077 | goto out; | |
5078 | case NFS4_REVOKED_DELEG_STID: | |
5079 | dp = delegstateid(s); | |
5080 | list_del_init(&dp->dl_recall_lru); | |
5081 | spin_unlock(&cl->cl_lock); | |
5082 | nfs4_put_stid(s); | |
5083 | ret = nfs_ok; | |
5084 | goto out; | |
5085 | /* Default falls through and returns nfserr_bad_stateid */ | |
5086 | } | |
5087 | out_unlock: | |
5088 | spin_unlock(&cl->cl_lock); | |
5089 | out: | |
5090 | return ret; | |
5091 | } | |
5092 | ||
5093 | static inline int | |
5094 | setlkflg (int type) | |
5095 | { | |
5096 | return (type == NFS4_READW_LT || type == NFS4_READ_LT) ? | |
5097 | RD_STATE : WR_STATE; | |
5098 | } | |
5099 | ||
5100 | static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp) | |
5101 | { | |
5102 | struct svc_fh *current_fh = &cstate->current_fh; | |
5103 | struct nfs4_stateowner *sop = stp->st_stateowner; | |
5104 | __be32 status; | |
5105 | ||
5106 | status = nfsd4_check_seqid(cstate, sop, seqid); | |
5107 | if (status) | |
5108 | return status; | |
5109 | if (stp->st_stid.sc_type == NFS4_CLOSED_STID | |
5110 | || stp->st_stid.sc_type == NFS4_REVOKED_DELEG_STID) | |
5111 | /* | |
5112 | * "Closed" stateid's exist *only* to return | |
5113 | * nfserr_replay_me from the previous step, and | |
5114 | * revoked delegations are kept only for free_stateid. | |
5115 | */ | |
5116 | return nfserr_bad_stateid; | |
5117 | mutex_lock(&stp->st_mutex); | |
5118 | status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate)); | |
5119 | if (status == nfs_ok) | |
5120 | status = nfs4_check_fh(current_fh, &stp->st_stid); | |
5121 | if (status != nfs_ok) | |
5122 | mutex_unlock(&stp->st_mutex); | |
5123 | return status; | |
5124 | } | |
5125 | ||
5126 | /* | |
5127 | * Checks for sequence id mutating operations. | |
5128 | */ | |
5129 | static __be32 | |
5130 | nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid, | |
5131 | stateid_t *stateid, char typemask, | |
5132 | struct nfs4_ol_stateid **stpp, | |
5133 | struct nfsd_net *nn) | |
5134 | { | |
5135 | __be32 status; | |
5136 | struct nfs4_stid *s; | |
5137 | struct nfs4_ol_stateid *stp = NULL; | |
5138 | ||
5139 | dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__, | |
5140 | seqid, STATEID_VAL(stateid)); | |
5141 | ||
5142 | *stpp = NULL; | |
5143 | status = nfsd4_lookup_stateid(cstate, stateid, typemask, &s, nn); | |
5144 | if (status) | |
5145 | return status; | |
5146 | stp = openlockstateid(s); | |
5147 | nfsd4_cstate_assign_replay(cstate, stp->st_stateowner); | |
5148 | ||
5149 | status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp); | |
5150 | if (!status) | |
5151 | *stpp = stp; | |
5152 | else | |
5153 | nfs4_put_stid(&stp->st_stid); | |
5154 | return status; | |
5155 | } | |
5156 | ||
5157 | static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid, | |
5158 | stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn) | |
5159 | { | |
5160 | __be32 status; | |
5161 | struct nfs4_openowner *oo; | |
5162 | struct nfs4_ol_stateid *stp; | |
5163 | ||
5164 | status = nfs4_preprocess_seqid_op(cstate, seqid, stateid, | |
5165 | NFS4_OPEN_STID, &stp, nn); | |
5166 | if (status) | |
5167 | return status; | |
5168 | oo = openowner(stp->st_stateowner); | |
5169 | if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) { | |
5170 | mutex_unlock(&stp->st_mutex); | |
5171 | nfs4_put_stid(&stp->st_stid); | |
5172 | return nfserr_bad_stateid; | |
5173 | } | |
5174 | *stpp = stp; | |
5175 | return nfs_ok; | |
5176 | } | |
5177 | ||
5178 | __be32 | |
5179 | nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, | |
5180 | union nfsd4_op_u *u) | |
5181 | { | |
5182 | struct nfsd4_open_confirm *oc = &u->open_confirm; | |
5183 | __be32 status; | |
5184 | struct nfs4_openowner *oo; | |
5185 | struct nfs4_ol_stateid *stp; | |
5186 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
5187 | ||
5188 | dprintk("NFSD: nfsd4_open_confirm on file %pd\n", | |
5189 | cstate->current_fh.fh_dentry); | |
5190 | ||
5191 | status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0); | |
5192 | if (status) | |
5193 | return status; | |
5194 | ||
5195 | status = nfs4_preprocess_seqid_op(cstate, | |
5196 | oc->oc_seqid, &oc->oc_req_stateid, | |
5197 | NFS4_OPEN_STID, &stp, nn); | |
5198 | if (status) | |
5199 | goto out; | |
5200 | oo = openowner(stp->st_stateowner); | |
5201 | status = nfserr_bad_stateid; | |
5202 | if (oo->oo_flags & NFS4_OO_CONFIRMED) { | |
5203 | mutex_unlock(&stp->st_mutex); | |
5204 | goto put_stateid; | |
5205 | } | |
5206 | oo->oo_flags |= NFS4_OO_CONFIRMED; | |
5207 | nfs4_inc_and_copy_stateid(&oc->oc_resp_stateid, &stp->st_stid); | |
5208 | mutex_unlock(&stp->st_mutex); | |
5209 | dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n", | |
5210 | __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid)); | |
5211 | ||
5212 | nfsd4_client_record_create(oo->oo_owner.so_client); | |
5213 | status = nfs_ok; | |
5214 | put_stateid: | |
5215 | nfs4_put_stid(&stp->st_stid); | |
5216 | out: | |
5217 | nfsd4_bump_seqid(cstate, status); | |
5218 | return status; | |
5219 | } | |
5220 | ||
5221 | static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access) | |
5222 | { | |
5223 | if (!test_access(access, stp)) | |
5224 | return; | |
5225 | nfs4_file_put_access(stp->st_stid.sc_file, access); | |
5226 | clear_access(access, stp); | |
5227 | } | |
5228 | ||
5229 | static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access) | |
5230 | { | |
5231 | switch (to_access) { | |
5232 | case NFS4_SHARE_ACCESS_READ: | |
5233 | nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE); | |
5234 | nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH); | |
5235 | break; | |
5236 | case NFS4_SHARE_ACCESS_WRITE: | |
5237 | nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ); | |
5238 | nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH); | |
5239 | break; | |
5240 | case NFS4_SHARE_ACCESS_BOTH: | |
5241 | break; | |
5242 | default: | |
5243 | WARN_ON_ONCE(1); | |
5244 | } | |
5245 | } | |
5246 | ||
5247 | __be32 | |
5248 | nfsd4_open_downgrade(struct svc_rqst *rqstp, | |
5249 | struct nfsd4_compound_state *cstate, union nfsd4_op_u *u) | |
5250 | { | |
5251 | struct nfsd4_open_downgrade *od = &u->open_downgrade; | |
5252 | __be32 status; | |
5253 | struct nfs4_ol_stateid *stp; | |
5254 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
5255 | ||
5256 | dprintk("NFSD: nfsd4_open_downgrade on file %pd\n", | |
5257 | cstate->current_fh.fh_dentry); | |
5258 | ||
5259 | /* We don't yet support WANT bits: */ | |
5260 | if (od->od_deleg_want) | |
5261 | dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__, | |
5262 | od->od_deleg_want); | |
5263 | ||
5264 | status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid, | |
5265 | &od->od_stateid, &stp, nn); | |
5266 | if (status) | |
5267 | goto out; | |
5268 | status = nfserr_inval; | |
5269 | if (!test_access(od->od_share_access, stp)) { | |
5270 | dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n", | |
5271 | stp->st_access_bmap, od->od_share_access); | |
5272 | goto put_stateid; | |
5273 | } | |
5274 | if (!test_deny(od->od_share_deny, stp)) { | |
5275 | dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n", | |
5276 | stp->st_deny_bmap, od->od_share_deny); | |
5277 | goto put_stateid; | |
5278 | } | |
5279 | nfs4_stateid_downgrade(stp, od->od_share_access); | |
5280 | reset_union_bmap_deny(od->od_share_deny, stp); | |
5281 | nfs4_inc_and_copy_stateid(&od->od_stateid, &stp->st_stid); | |
5282 | status = nfs_ok; | |
5283 | put_stateid: | |
5284 | mutex_unlock(&stp->st_mutex); | |
5285 | nfs4_put_stid(&stp->st_stid); | |
5286 | out: | |
5287 | nfsd4_bump_seqid(cstate, status); | |
5288 | return status; | |
5289 | } | |
5290 | ||
5291 | static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s) | |
5292 | { | |
5293 | struct nfs4_client *clp = s->st_stid.sc_client; | |
5294 | bool unhashed; | |
5295 | LIST_HEAD(reaplist); | |
5296 | ||
5297 | s->st_stid.sc_type = NFS4_CLOSED_STID; | |
5298 | spin_lock(&clp->cl_lock); | |
5299 | unhashed = unhash_open_stateid(s, &reaplist); | |
5300 | ||
5301 | if (clp->cl_minorversion) { | |
5302 | if (unhashed) | |
5303 | put_ol_stateid_locked(s, &reaplist); | |
5304 | spin_unlock(&clp->cl_lock); | |
5305 | free_ol_stateid_reaplist(&reaplist); | |
5306 | } else { | |
5307 | spin_unlock(&clp->cl_lock); | |
5308 | free_ol_stateid_reaplist(&reaplist); | |
5309 | if (unhashed) | |
5310 | move_to_close_lru(s, clp->net); | |
5311 | } | |
5312 | } | |
5313 | ||
5314 | /* | |
5315 | * nfs4_unlock_state() called after encode | |
5316 | */ | |
5317 | __be32 | |
5318 | nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, | |
5319 | union nfsd4_op_u *u) | |
5320 | { | |
5321 | struct nfsd4_close *close = &u->close; | |
5322 | __be32 status; | |
5323 | struct nfs4_ol_stateid *stp; | |
5324 | struct net *net = SVC_NET(rqstp); | |
5325 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
5326 | ||
5327 | dprintk("NFSD: nfsd4_close on file %pd\n", | |
5328 | cstate->current_fh.fh_dentry); | |
5329 | ||
5330 | status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid, | |
5331 | &close->cl_stateid, | |
5332 | NFS4_OPEN_STID|NFS4_CLOSED_STID, | |
5333 | &stp, nn); | |
5334 | nfsd4_bump_seqid(cstate, status); | |
5335 | if (status) | |
5336 | goto out; | |
5337 | nfs4_inc_and_copy_stateid(&close->cl_stateid, &stp->st_stid); | |
5338 | mutex_unlock(&stp->st_mutex); | |
5339 | ||
5340 | nfsd4_close_open_stateid(stp); | |
5341 | ||
5342 | /* put reference from nfs4_preprocess_seqid_op */ | |
5343 | nfs4_put_stid(&stp->st_stid); | |
5344 | out: | |
5345 | return status; | |
5346 | } | |
5347 | ||
5348 | __be32 | |
5349 | nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, | |
5350 | union nfsd4_op_u *u) | |
5351 | { | |
5352 | struct nfsd4_delegreturn *dr = &u->delegreturn; | |
5353 | struct nfs4_delegation *dp; | |
5354 | stateid_t *stateid = &dr->dr_stateid; | |
5355 | struct nfs4_stid *s; | |
5356 | __be32 status; | |
5357 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
5358 | ||
5359 | if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) | |
5360 | return status; | |
5361 | ||
5362 | status = nfsd4_lookup_stateid(cstate, stateid, NFS4_DELEG_STID, &s, nn); | |
5363 | if (status) | |
5364 | goto out; | |
5365 | dp = delegstateid(s); | |
5366 | status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate)); | |
5367 | if (status) | |
5368 | goto put_stateid; | |
5369 | ||
5370 | destroy_delegation(dp); | |
5371 | put_stateid: | |
5372 | nfs4_put_stid(&dp->dl_stid); | |
5373 | out: | |
5374 | return status; | |
5375 | } | |
5376 | ||
5377 | static inline u64 | |
5378 | end_offset(u64 start, u64 len) | |
5379 | { | |
5380 | u64 end; | |
5381 | ||
5382 | end = start + len; | |
5383 | return end >= start ? end: NFS4_MAX_UINT64; | |
5384 | } | |
5385 | ||
5386 | /* last octet in a range */ | |
5387 | static inline u64 | |
5388 | last_byte_offset(u64 start, u64 len) | |
5389 | { | |
5390 | u64 end; | |
5391 | ||
5392 | WARN_ON_ONCE(!len); | |
5393 | end = start + len; | |
5394 | return end > start ? end - 1: NFS4_MAX_UINT64; | |
5395 | } | |
5396 | ||
5397 | /* | |
5398 | * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that | |
5399 | * we can't properly handle lock requests that go beyond the (2^63 - 1)-th | |
5400 | * byte, because of sign extension problems. Since NFSv4 calls for 64-bit | |
5401 | * locking, this prevents us from being completely protocol-compliant. The | |
5402 | * real solution to this problem is to start using unsigned file offsets in | |
5403 | * the VFS, but this is a very deep change! | |
5404 | */ | |
5405 | static inline void | |
5406 | nfs4_transform_lock_offset(struct file_lock *lock) | |
5407 | { | |
5408 | if (lock->fl_start < 0) | |
5409 | lock->fl_start = OFFSET_MAX; | |
5410 | if (lock->fl_end < 0) | |
5411 | lock->fl_end = OFFSET_MAX; | |
5412 | } | |
5413 | ||
5414 | static fl_owner_t | |
5415 | nfsd4_fl_get_owner(fl_owner_t owner) | |
5416 | { | |
5417 | struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner; | |
5418 | ||
5419 | nfs4_get_stateowner(&lo->lo_owner); | |
5420 | return owner; | |
5421 | } | |
5422 | ||
5423 | static void | |
5424 | nfsd4_fl_put_owner(fl_owner_t owner) | |
5425 | { | |
5426 | struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner; | |
5427 | ||
5428 | if (lo) | |
5429 | nfs4_put_stateowner(&lo->lo_owner); | |
5430 | } | |
5431 | ||
5432 | static void | |
5433 | nfsd4_lm_notify(struct file_lock *fl) | |
5434 | { | |
5435 | struct nfs4_lockowner *lo = (struct nfs4_lockowner *)fl->fl_owner; | |
5436 | struct net *net = lo->lo_owner.so_client->net; | |
5437 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
5438 | struct nfsd4_blocked_lock *nbl = container_of(fl, | |
5439 | struct nfsd4_blocked_lock, nbl_lock); | |
5440 | bool queue = false; | |
5441 | ||
5442 | /* An empty list means that something else is going to be using it */ | |
5443 | spin_lock(&nn->blocked_locks_lock); | |
5444 | if (!list_empty(&nbl->nbl_list)) { | |
5445 | list_del_init(&nbl->nbl_list); | |
5446 | list_del_init(&nbl->nbl_lru); | |
5447 | queue = true; | |
5448 | } | |
5449 | spin_unlock(&nn->blocked_locks_lock); | |
5450 | ||
5451 | if (queue) | |
5452 | nfsd4_run_cb(&nbl->nbl_cb); | |
5453 | } | |
5454 | ||
5455 | static const struct lock_manager_operations nfsd_posix_mng_ops = { | |
5456 | .lm_notify = nfsd4_lm_notify, | |
5457 | .lm_get_owner = nfsd4_fl_get_owner, | |
5458 | .lm_put_owner = nfsd4_fl_put_owner, | |
5459 | }; | |
5460 | ||
5461 | static inline void | |
5462 | nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny) | |
5463 | { | |
5464 | struct nfs4_lockowner *lo; | |
5465 | ||
5466 | if (fl->fl_lmops == &nfsd_posix_mng_ops) { | |
5467 | lo = (struct nfs4_lockowner *) fl->fl_owner; | |
5468 | deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data, | |
5469 | lo->lo_owner.so_owner.len, GFP_KERNEL); | |
5470 | if (!deny->ld_owner.data) | |
5471 | /* We just don't care that much */ | |
5472 | goto nevermind; | |
5473 | deny->ld_owner.len = lo->lo_owner.so_owner.len; | |
5474 | deny->ld_clientid = lo->lo_owner.so_client->cl_clientid; | |
5475 | } else { | |
5476 | nevermind: | |
5477 | deny->ld_owner.len = 0; | |
5478 | deny->ld_owner.data = NULL; | |
5479 | deny->ld_clientid.cl_boot = 0; | |
5480 | deny->ld_clientid.cl_id = 0; | |
5481 | } | |
5482 | deny->ld_start = fl->fl_start; | |
5483 | deny->ld_length = NFS4_MAX_UINT64; | |
5484 | if (fl->fl_end != NFS4_MAX_UINT64) | |
5485 | deny->ld_length = fl->fl_end - fl->fl_start + 1; | |
5486 | deny->ld_type = NFS4_READ_LT; | |
5487 | if (fl->fl_type != F_RDLCK) | |
5488 | deny->ld_type = NFS4_WRITE_LT; | |
5489 | } | |
5490 | ||
5491 | static struct nfs4_lockowner * | |
5492 | find_lockowner_str_locked(struct nfs4_client *clp, struct xdr_netobj *owner) | |
5493 | { | |
5494 | unsigned int strhashval = ownerstr_hashval(owner); | |
5495 | struct nfs4_stateowner *so; | |
5496 | ||
5497 | lockdep_assert_held(&clp->cl_lock); | |
5498 | ||
5499 | list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval], | |
5500 | so_strhash) { | |
5501 | if (so->so_is_open_owner) | |
5502 | continue; | |
5503 | if (same_owner_str(so, owner)) | |
5504 | return lockowner(nfs4_get_stateowner(so)); | |
5505 | } | |
5506 | return NULL; | |
5507 | } | |
5508 | ||
5509 | static struct nfs4_lockowner * | |
5510 | find_lockowner_str(struct nfs4_client *clp, struct xdr_netobj *owner) | |
5511 | { | |
5512 | struct nfs4_lockowner *lo; | |
5513 | ||
5514 | spin_lock(&clp->cl_lock); | |
5515 | lo = find_lockowner_str_locked(clp, owner); | |
5516 | spin_unlock(&clp->cl_lock); | |
5517 | return lo; | |
5518 | } | |
5519 | ||
5520 | static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop) | |
5521 | { | |
5522 | unhash_lockowner_locked(lockowner(sop)); | |
5523 | } | |
5524 | ||
5525 | static void nfs4_free_lockowner(struct nfs4_stateowner *sop) | |
5526 | { | |
5527 | struct nfs4_lockowner *lo = lockowner(sop); | |
5528 | ||
5529 | kmem_cache_free(lockowner_slab, lo); | |
5530 | } | |
5531 | ||
5532 | static const struct nfs4_stateowner_operations lockowner_ops = { | |
5533 | .so_unhash = nfs4_unhash_lockowner, | |
5534 | .so_free = nfs4_free_lockowner, | |
5535 | }; | |
5536 | ||
5537 | /* | |
5538 | * Alloc a lock owner structure. | |
5539 | * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has | |
5540 | * occurred. | |
5541 | * | |
5542 | * strhashval = ownerstr_hashval | |
5543 | */ | |
5544 | static struct nfs4_lockowner * | |
5545 | alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, | |
5546 | struct nfs4_ol_stateid *open_stp, | |
5547 | struct nfsd4_lock *lock) | |
5548 | { | |
5549 | struct nfs4_lockowner *lo, *ret; | |
5550 | ||
5551 | lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp); | |
5552 | if (!lo) | |
5553 | return NULL; | |
5554 | INIT_LIST_HEAD(&lo->lo_blocked); | |
5555 | INIT_LIST_HEAD(&lo->lo_owner.so_stateids); | |
5556 | lo->lo_owner.so_is_open_owner = 0; | |
5557 | lo->lo_owner.so_seqid = lock->lk_new_lock_seqid; | |
5558 | lo->lo_owner.so_ops = &lockowner_ops; | |
5559 | spin_lock(&clp->cl_lock); | |
5560 | ret = find_lockowner_str_locked(clp, &lock->lk_new_owner); | |
5561 | if (ret == NULL) { | |
5562 | list_add(&lo->lo_owner.so_strhash, | |
5563 | &clp->cl_ownerstr_hashtbl[strhashval]); | |
5564 | ret = lo; | |
5565 | } else | |
5566 | nfs4_free_stateowner(&lo->lo_owner); | |
5567 | ||
5568 | spin_unlock(&clp->cl_lock); | |
5569 | return ret; | |
5570 | } | |
5571 | ||
5572 | static void | |
5573 | init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo, | |
5574 | struct nfs4_file *fp, struct inode *inode, | |
5575 | struct nfs4_ol_stateid *open_stp) | |
5576 | { | |
5577 | struct nfs4_client *clp = lo->lo_owner.so_client; | |
5578 | ||
5579 | lockdep_assert_held(&clp->cl_lock); | |
5580 | ||
5581 | atomic_inc(&stp->st_stid.sc_count); | |
5582 | stp->st_stid.sc_type = NFS4_LOCK_STID; | |
5583 | stp->st_stateowner = nfs4_get_stateowner(&lo->lo_owner); | |
5584 | get_nfs4_file(fp); | |
5585 | stp->st_stid.sc_file = fp; | |
5586 | stp->st_access_bmap = 0; | |
5587 | stp->st_deny_bmap = open_stp->st_deny_bmap; | |
5588 | stp->st_openstp = open_stp; | |
5589 | mutex_init(&stp->st_mutex); | |
5590 | list_add(&stp->st_locks, &open_stp->st_locks); | |
5591 | list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids); | |
5592 | spin_lock(&fp->fi_lock); | |
5593 | list_add(&stp->st_perfile, &fp->fi_stateids); | |
5594 | spin_unlock(&fp->fi_lock); | |
5595 | } | |
5596 | ||
5597 | static struct nfs4_ol_stateid * | |
5598 | find_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp) | |
5599 | { | |
5600 | struct nfs4_ol_stateid *lst; | |
5601 | struct nfs4_client *clp = lo->lo_owner.so_client; | |
5602 | ||
5603 | lockdep_assert_held(&clp->cl_lock); | |
5604 | ||
5605 | list_for_each_entry(lst, &lo->lo_owner.so_stateids, st_perstateowner) { | |
5606 | if (lst->st_stid.sc_file == fp) { | |
5607 | atomic_inc(&lst->st_stid.sc_count); | |
5608 | return lst; | |
5609 | } | |
5610 | } | |
5611 | return NULL; | |
5612 | } | |
5613 | ||
5614 | static struct nfs4_ol_stateid * | |
5615 | find_or_create_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fi, | |
5616 | struct inode *inode, struct nfs4_ol_stateid *ost, | |
5617 | bool *new) | |
5618 | { | |
5619 | struct nfs4_stid *ns = NULL; | |
5620 | struct nfs4_ol_stateid *lst; | |
5621 | struct nfs4_openowner *oo = openowner(ost->st_stateowner); | |
5622 | struct nfs4_client *clp = oo->oo_owner.so_client; | |
5623 | ||
5624 | spin_lock(&clp->cl_lock); | |
5625 | lst = find_lock_stateid(lo, fi); | |
5626 | if (lst == NULL) { | |
5627 | spin_unlock(&clp->cl_lock); | |
5628 | ns = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_lock_stateid); | |
5629 | if (ns == NULL) | |
5630 | return NULL; | |
5631 | ||
5632 | spin_lock(&clp->cl_lock); | |
5633 | lst = find_lock_stateid(lo, fi); | |
5634 | if (likely(!lst)) { | |
5635 | lst = openlockstateid(ns); | |
5636 | init_lock_stateid(lst, lo, fi, inode, ost); | |
5637 | ns = NULL; | |
5638 | *new = true; | |
5639 | } | |
5640 | } | |
5641 | spin_unlock(&clp->cl_lock); | |
5642 | if (ns) | |
5643 | nfs4_put_stid(ns); | |
5644 | return lst; | |
5645 | } | |
5646 | ||
5647 | static int | |
5648 | check_lock_length(u64 offset, u64 length) | |
5649 | { | |
5650 | return ((length == 0) || ((length != NFS4_MAX_UINT64) && | |
5651 | (length > ~offset))); | |
5652 | } | |
5653 | ||
5654 | static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access) | |
5655 | { | |
5656 | struct nfs4_file *fp = lock_stp->st_stid.sc_file; | |
5657 | ||
5658 | lockdep_assert_held(&fp->fi_lock); | |
5659 | ||
5660 | if (test_access(access, lock_stp)) | |
5661 | return; | |
5662 | __nfs4_file_get_access(fp, access); | |
5663 | set_access(access, lock_stp); | |
5664 | } | |
5665 | ||
5666 | static __be32 | |
5667 | lookup_or_create_lock_state(struct nfsd4_compound_state *cstate, | |
5668 | struct nfs4_ol_stateid *ost, | |
5669 | struct nfsd4_lock *lock, | |
5670 | struct nfs4_ol_stateid **plst, bool *new) | |
5671 | { | |
5672 | __be32 status; | |
5673 | struct nfs4_file *fi = ost->st_stid.sc_file; | |
5674 | struct nfs4_openowner *oo = openowner(ost->st_stateowner); | |
5675 | struct nfs4_client *cl = oo->oo_owner.so_client; | |
5676 | struct inode *inode = d_inode(cstate->current_fh.fh_dentry); | |
5677 | struct nfs4_lockowner *lo; | |
5678 | struct nfs4_ol_stateid *lst; | |
5679 | unsigned int strhashval; | |
5680 | bool hashed; | |
5681 | ||
5682 | lo = find_lockowner_str(cl, &lock->lk_new_owner); | |
5683 | if (!lo) { | |
5684 | strhashval = ownerstr_hashval(&lock->lk_new_owner); | |
5685 | lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock); | |
5686 | if (lo == NULL) | |
5687 | return nfserr_jukebox; | |
5688 | } else { | |
5689 | /* with an existing lockowner, seqids must be the same */ | |
5690 | status = nfserr_bad_seqid; | |
5691 | if (!cstate->minorversion && | |
5692 | lock->lk_new_lock_seqid != lo->lo_owner.so_seqid) | |
5693 | goto out; | |
5694 | } | |
5695 | ||
5696 | retry: | |
5697 | lst = find_or_create_lock_stateid(lo, fi, inode, ost, new); | |
5698 | if (lst == NULL) { | |
5699 | status = nfserr_jukebox; | |
5700 | goto out; | |
5701 | } | |
5702 | ||
5703 | mutex_lock(&lst->st_mutex); | |
5704 | ||
5705 | /* See if it's still hashed to avoid race with FREE_STATEID */ | |
5706 | spin_lock(&cl->cl_lock); | |
5707 | hashed = !list_empty(&lst->st_perfile); | |
5708 | spin_unlock(&cl->cl_lock); | |
5709 | ||
5710 | if (!hashed) { | |
5711 | mutex_unlock(&lst->st_mutex); | |
5712 | nfs4_put_stid(&lst->st_stid); | |
5713 | goto retry; | |
5714 | } | |
5715 | status = nfs_ok; | |
5716 | *plst = lst; | |
5717 | out: | |
5718 | nfs4_put_stateowner(&lo->lo_owner); | |
5719 | return status; | |
5720 | } | |
5721 | ||
5722 | /* | |
5723 | * LOCK operation | |
5724 | */ | |
5725 | __be32 | |
5726 | nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, | |
5727 | union nfsd4_op_u *u) | |
5728 | { | |
5729 | struct nfsd4_lock *lock = &u->lock; | |
5730 | struct nfs4_openowner *open_sop = NULL; | |
5731 | struct nfs4_lockowner *lock_sop = NULL; | |
5732 | struct nfs4_ol_stateid *lock_stp = NULL; | |
5733 | struct nfs4_ol_stateid *open_stp = NULL; | |
5734 | struct nfs4_file *fp; | |
5735 | struct file *filp = NULL; | |
5736 | struct nfsd4_blocked_lock *nbl = NULL; | |
5737 | struct file_lock *file_lock = NULL; | |
5738 | struct file_lock *conflock = NULL; | |
5739 | __be32 status = 0; | |
5740 | int lkflg; | |
5741 | int err; | |
5742 | bool new = false; | |
5743 | unsigned char fl_type; | |
5744 | unsigned int fl_flags = FL_POSIX; | |
5745 | struct net *net = SVC_NET(rqstp); | |
5746 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
5747 | ||
5748 | dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n", | |
5749 | (long long) lock->lk_offset, | |
5750 | (long long) lock->lk_length); | |
5751 | ||
5752 | if (check_lock_length(lock->lk_offset, lock->lk_length)) | |
5753 | return nfserr_inval; | |
5754 | ||
5755 | if ((status = fh_verify(rqstp, &cstate->current_fh, | |
5756 | S_IFREG, NFSD_MAY_LOCK))) { | |
5757 | dprintk("NFSD: nfsd4_lock: permission denied!\n"); | |
5758 | return status; | |
5759 | } | |
5760 | ||
5761 | if (lock->lk_is_new) { | |
5762 | if (nfsd4_has_session(cstate)) | |
5763 | /* See rfc 5661 18.10.3: given clientid is ignored: */ | |
5764 | memcpy(&lock->lk_new_clientid, | |
5765 | &cstate->session->se_client->cl_clientid, | |
5766 | sizeof(clientid_t)); | |
5767 | ||
5768 | status = nfserr_stale_clientid; | |
5769 | if (STALE_CLIENTID(&lock->lk_new_clientid, nn)) | |
5770 | goto out; | |
5771 | ||
5772 | /* validate and update open stateid and open seqid */ | |
5773 | status = nfs4_preprocess_confirmed_seqid_op(cstate, | |
5774 | lock->lk_new_open_seqid, | |
5775 | &lock->lk_new_open_stateid, | |
5776 | &open_stp, nn); | |
5777 | if (status) | |
5778 | goto out; | |
5779 | mutex_unlock(&open_stp->st_mutex); | |
5780 | open_sop = openowner(open_stp->st_stateowner); | |
5781 | status = nfserr_bad_stateid; | |
5782 | if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid, | |
5783 | &lock->lk_new_clientid)) | |
5784 | goto out; | |
5785 | status = lookup_or_create_lock_state(cstate, open_stp, lock, | |
5786 | &lock_stp, &new); | |
5787 | } else { | |
5788 | status = nfs4_preprocess_seqid_op(cstate, | |
5789 | lock->lk_old_lock_seqid, | |
5790 | &lock->lk_old_lock_stateid, | |
5791 | NFS4_LOCK_STID, &lock_stp, nn); | |
5792 | } | |
5793 | if (status) | |
5794 | goto out; | |
5795 | lock_sop = lockowner(lock_stp->st_stateowner); | |
5796 | ||
5797 | lkflg = setlkflg(lock->lk_type); | |
5798 | status = nfs4_check_openmode(lock_stp, lkflg); | |
5799 | if (status) | |
5800 | goto out; | |
5801 | ||
5802 | status = nfserr_grace; | |
5803 | if (locks_in_grace(net) && !lock->lk_reclaim) | |
5804 | goto out; | |
5805 | status = nfserr_no_grace; | |
5806 | if (!locks_in_grace(net) && lock->lk_reclaim) | |
5807 | goto out; | |
5808 | ||
5809 | fp = lock_stp->st_stid.sc_file; | |
5810 | switch (lock->lk_type) { | |
5811 | case NFS4_READW_LT: | |
5812 | if (nfsd4_has_session(cstate)) | |
5813 | fl_flags |= FL_SLEEP; | |
5814 | /* Fallthrough */ | |
5815 | case NFS4_READ_LT: | |
5816 | spin_lock(&fp->fi_lock); | |
5817 | filp = find_readable_file_locked(fp); | |
5818 | if (filp) | |
5819 | get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ); | |
5820 | spin_unlock(&fp->fi_lock); | |
5821 | fl_type = F_RDLCK; | |
5822 | break; | |
5823 | case NFS4_WRITEW_LT: | |
5824 | if (nfsd4_has_session(cstate)) | |
5825 | fl_flags |= FL_SLEEP; | |
5826 | /* Fallthrough */ | |
5827 | case NFS4_WRITE_LT: | |
5828 | spin_lock(&fp->fi_lock); | |
5829 | filp = find_writeable_file_locked(fp); | |
5830 | if (filp) | |
5831 | get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE); | |
5832 | spin_unlock(&fp->fi_lock); | |
5833 | fl_type = F_WRLCK; | |
5834 | break; | |
5835 | default: | |
5836 | status = nfserr_inval; | |
5837 | goto out; | |
5838 | } | |
5839 | ||
5840 | if (!filp) { | |
5841 | status = nfserr_openmode; | |
5842 | goto out; | |
5843 | } | |
5844 | ||
5845 | nbl = find_or_allocate_block(lock_sop, &fp->fi_fhandle, nn); | |
5846 | if (!nbl) { | |
5847 | dprintk("NFSD: %s: unable to allocate block!\n", __func__); | |
5848 | status = nfserr_jukebox; | |
5849 | goto out; | |
5850 | } | |
5851 | ||
5852 | file_lock = &nbl->nbl_lock; | |
5853 | file_lock->fl_type = fl_type; | |
5854 | file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(&lock_sop->lo_owner)); | |
5855 | file_lock->fl_pid = current->tgid; | |
5856 | file_lock->fl_file = filp; | |
5857 | file_lock->fl_flags = fl_flags; | |
5858 | file_lock->fl_lmops = &nfsd_posix_mng_ops; | |
5859 | file_lock->fl_start = lock->lk_offset; | |
5860 | file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length); | |
5861 | nfs4_transform_lock_offset(file_lock); | |
5862 | ||
5863 | conflock = locks_alloc_lock(); | |
5864 | if (!conflock) { | |
5865 | dprintk("NFSD: %s: unable to allocate lock!\n", __func__); | |
5866 | status = nfserr_jukebox; | |
5867 | goto out; | |
5868 | } | |
5869 | ||
5870 | if (fl_flags & FL_SLEEP) { | |
5871 | nbl->nbl_time = jiffies; | |
5872 | spin_lock(&nn->blocked_locks_lock); | |
5873 | list_add_tail(&nbl->nbl_list, &lock_sop->lo_blocked); | |
5874 | list_add_tail(&nbl->nbl_lru, &nn->blocked_locks_lru); | |
5875 | spin_unlock(&nn->blocked_locks_lock); | |
5876 | } | |
5877 | ||
5878 | err = vfs_lock_file(filp, F_SETLK, file_lock, conflock); | |
5879 | switch (err) { | |
5880 | case 0: /* success! */ | |
5881 | nfs4_inc_and_copy_stateid(&lock->lk_resp_stateid, &lock_stp->st_stid); | |
5882 | status = 0; | |
5883 | break; | |
5884 | case FILE_LOCK_DEFERRED: | |
5885 | nbl = NULL; | |
5886 | /* Fallthrough */ | |
5887 | case -EAGAIN: /* conflock holds conflicting lock */ | |
5888 | status = nfserr_denied; | |
5889 | dprintk("NFSD: nfsd4_lock: conflicting lock found!\n"); | |
5890 | nfs4_set_lock_denied(conflock, &lock->lk_denied); | |
5891 | break; | |
5892 | case -EDEADLK: | |
5893 | status = nfserr_deadlock; | |
5894 | break; | |
5895 | default: | |
5896 | dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err); | |
5897 | status = nfserrno(err); | |
5898 | break; | |
5899 | } | |
5900 | out: | |
5901 | if (nbl) { | |
5902 | /* dequeue it if we queued it before */ | |
5903 | if (fl_flags & FL_SLEEP) { | |
5904 | spin_lock(&nn->blocked_locks_lock); | |
5905 | list_del_init(&nbl->nbl_list); | |
5906 | list_del_init(&nbl->nbl_lru); | |
5907 | spin_unlock(&nn->blocked_locks_lock); | |
5908 | } | |
5909 | free_blocked_lock(nbl); | |
5910 | } | |
5911 | if (filp) | |
5912 | fput(filp); | |
5913 | if (lock_stp) { | |
5914 | /* Bump seqid manually if the 4.0 replay owner is openowner */ | |
5915 | if (cstate->replay_owner && | |
5916 | cstate->replay_owner != &lock_sop->lo_owner && | |
5917 | seqid_mutating_err(ntohl(status))) | |
5918 | lock_sop->lo_owner.so_seqid++; | |
5919 | ||
5920 | mutex_unlock(&lock_stp->st_mutex); | |
5921 | ||
5922 | /* | |
5923 | * If this is a new, never-before-used stateid, and we are | |
5924 | * returning an error, then just go ahead and release it. | |
5925 | */ | |
5926 | if (status && new) | |
5927 | release_lock_stateid(lock_stp); | |
5928 | ||
5929 | nfs4_put_stid(&lock_stp->st_stid); | |
5930 | } | |
5931 | if (open_stp) | |
5932 | nfs4_put_stid(&open_stp->st_stid); | |
5933 | nfsd4_bump_seqid(cstate, status); | |
5934 | if (conflock) | |
5935 | locks_free_lock(conflock); | |
5936 | return status; | |
5937 | } | |
5938 | ||
5939 | /* | |
5940 | * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN, | |
5941 | * so we do a temporary open here just to get an open file to pass to | |
5942 | * vfs_test_lock. (Arguably perhaps test_lock should be done with an | |
5943 | * inode operation.) | |
5944 | */ | |
5945 | static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock) | |
5946 | { | |
5947 | struct file *file; | |
5948 | __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); | |
5949 | if (!err) { | |
5950 | err = nfserrno(vfs_test_lock(file, lock)); | |
5951 | fput(file); | |
5952 | } | |
5953 | return err; | |
5954 | } | |
5955 | ||
5956 | /* | |
5957 | * LOCKT operation | |
5958 | */ | |
5959 | __be32 | |
5960 | nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, | |
5961 | union nfsd4_op_u *u) | |
5962 | { | |
5963 | struct nfsd4_lockt *lockt = &u->lockt; | |
5964 | struct file_lock *file_lock = NULL; | |
5965 | struct nfs4_lockowner *lo = NULL; | |
5966 | __be32 status; | |
5967 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
5968 | ||
5969 | if (locks_in_grace(SVC_NET(rqstp))) | |
5970 | return nfserr_grace; | |
5971 | ||
5972 | if (check_lock_length(lockt->lt_offset, lockt->lt_length)) | |
5973 | return nfserr_inval; | |
5974 | ||
5975 | if (!nfsd4_has_session(cstate)) { | |
5976 | status = lookup_clientid(&lockt->lt_clientid, cstate, nn); | |
5977 | if (status) | |
5978 | goto out; | |
5979 | } | |
5980 | ||
5981 | if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) | |
5982 | goto out; | |
5983 | ||
5984 | file_lock = locks_alloc_lock(); | |
5985 | if (!file_lock) { | |
5986 | dprintk("NFSD: %s: unable to allocate lock!\n", __func__); | |
5987 | status = nfserr_jukebox; | |
5988 | goto out; | |
5989 | } | |
5990 | ||
5991 | switch (lockt->lt_type) { | |
5992 | case NFS4_READ_LT: | |
5993 | case NFS4_READW_LT: | |
5994 | file_lock->fl_type = F_RDLCK; | |
5995 | break; | |
5996 | case NFS4_WRITE_LT: | |
5997 | case NFS4_WRITEW_LT: | |
5998 | file_lock->fl_type = F_WRLCK; | |
5999 | break; | |
6000 | default: | |
6001 | dprintk("NFSD: nfs4_lockt: bad lock type!\n"); | |
6002 | status = nfserr_inval; | |
6003 | goto out; | |
6004 | } | |
6005 | ||
6006 | lo = find_lockowner_str(cstate->clp, &lockt->lt_owner); | |
6007 | if (lo) | |
6008 | file_lock->fl_owner = (fl_owner_t)lo; | |
6009 | file_lock->fl_pid = current->tgid; | |
6010 | file_lock->fl_flags = FL_POSIX; | |
6011 | ||
6012 | file_lock->fl_start = lockt->lt_offset; | |
6013 | file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length); | |
6014 | ||
6015 | nfs4_transform_lock_offset(file_lock); | |
6016 | ||
6017 | status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock); | |
6018 | if (status) | |
6019 | goto out; | |
6020 | ||
6021 | if (file_lock->fl_type != F_UNLCK) { | |
6022 | status = nfserr_denied; | |
6023 | nfs4_set_lock_denied(file_lock, &lockt->lt_denied); | |
6024 | } | |
6025 | out: | |
6026 | if (lo) | |
6027 | nfs4_put_stateowner(&lo->lo_owner); | |
6028 | if (file_lock) | |
6029 | locks_free_lock(file_lock); | |
6030 | return status; | |
6031 | } | |
6032 | ||
6033 | __be32 | |
6034 | nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, | |
6035 | union nfsd4_op_u *u) | |
6036 | { | |
6037 | struct nfsd4_locku *locku = &u->locku; | |
6038 | struct nfs4_ol_stateid *stp; | |
6039 | struct file *filp = NULL; | |
6040 | struct file_lock *file_lock = NULL; | |
6041 | __be32 status; | |
6042 | int err; | |
6043 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
6044 | ||
6045 | dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n", | |
6046 | (long long) locku->lu_offset, | |
6047 | (long long) locku->lu_length); | |
6048 | ||
6049 | if (check_lock_length(locku->lu_offset, locku->lu_length)) | |
6050 | return nfserr_inval; | |
6051 | ||
6052 | status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid, | |
6053 | &locku->lu_stateid, NFS4_LOCK_STID, | |
6054 | &stp, nn); | |
6055 | if (status) | |
6056 | goto out; | |
6057 | filp = find_any_file(stp->st_stid.sc_file); | |
6058 | if (!filp) { | |
6059 | status = nfserr_lock_range; | |
6060 | goto put_stateid; | |
6061 | } | |
6062 | file_lock = locks_alloc_lock(); | |
6063 | if (!file_lock) { | |
6064 | dprintk("NFSD: %s: unable to allocate lock!\n", __func__); | |
6065 | status = nfserr_jukebox; | |
6066 | goto fput; | |
6067 | } | |
6068 | ||
6069 | file_lock->fl_type = F_UNLCK; | |
6070 | file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(stp->st_stateowner)); | |
6071 | file_lock->fl_pid = current->tgid; | |
6072 | file_lock->fl_file = filp; | |
6073 | file_lock->fl_flags = FL_POSIX; | |
6074 | file_lock->fl_lmops = &nfsd_posix_mng_ops; | |
6075 | file_lock->fl_start = locku->lu_offset; | |
6076 | ||
6077 | file_lock->fl_end = last_byte_offset(locku->lu_offset, | |
6078 | locku->lu_length); | |
6079 | nfs4_transform_lock_offset(file_lock); | |
6080 | ||
6081 | err = vfs_lock_file(filp, F_SETLK, file_lock, NULL); | |
6082 | if (err) { | |
6083 | dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n"); | |
6084 | goto out_nfserr; | |
6085 | } | |
6086 | nfs4_inc_and_copy_stateid(&locku->lu_stateid, &stp->st_stid); | |
6087 | fput: | |
6088 | fput(filp); | |
6089 | put_stateid: | |
6090 | mutex_unlock(&stp->st_mutex); | |
6091 | nfs4_put_stid(&stp->st_stid); | |
6092 | out: | |
6093 | nfsd4_bump_seqid(cstate, status); | |
6094 | if (file_lock) | |
6095 | locks_free_lock(file_lock); | |
6096 | return status; | |
6097 | ||
6098 | out_nfserr: | |
6099 | status = nfserrno(err); | |
6100 | goto fput; | |
6101 | } | |
6102 | ||
6103 | /* | |
6104 | * returns | |
6105 | * true: locks held by lockowner | |
6106 | * false: no locks held by lockowner | |
6107 | */ | |
6108 | static bool | |
6109 | check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner) | |
6110 | { | |
6111 | struct file_lock *fl; | |
6112 | int status = false; | |
6113 | struct file *filp = find_any_file(fp); | |
6114 | struct inode *inode; | |
6115 | struct file_lock_context *flctx; | |
6116 | ||
6117 | if (!filp) { | |
6118 | /* Any valid lock stateid should have some sort of access */ | |
6119 | WARN_ON_ONCE(1); | |
6120 | return status; | |
6121 | } | |
6122 | ||
6123 | inode = file_inode(filp); | |
6124 | flctx = inode->i_flctx; | |
6125 | ||
6126 | if (flctx && !list_empty_careful(&flctx->flc_posix)) { | |
6127 | spin_lock(&flctx->flc_lock); | |
6128 | list_for_each_entry(fl, &flctx->flc_posix, fl_list) { | |
6129 | if (fl->fl_owner == (fl_owner_t)lowner) { | |
6130 | status = true; | |
6131 | break; | |
6132 | } | |
6133 | } | |
6134 | spin_unlock(&flctx->flc_lock); | |
6135 | } | |
6136 | fput(filp); | |
6137 | return status; | |
6138 | } | |
6139 | ||
6140 | __be32 | |
6141 | nfsd4_release_lockowner(struct svc_rqst *rqstp, | |
6142 | struct nfsd4_compound_state *cstate, | |
6143 | union nfsd4_op_u *u) | |
6144 | { | |
6145 | struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner; | |
6146 | clientid_t *clid = &rlockowner->rl_clientid; | |
6147 | struct nfs4_stateowner *sop; | |
6148 | struct nfs4_lockowner *lo = NULL; | |
6149 | struct nfs4_ol_stateid *stp; | |
6150 | struct xdr_netobj *owner = &rlockowner->rl_owner; | |
6151 | unsigned int hashval = ownerstr_hashval(owner); | |
6152 | __be32 status; | |
6153 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
6154 | struct nfs4_client *clp; | |
6155 | LIST_HEAD (reaplist); | |
6156 | ||
6157 | dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n", | |
6158 | clid->cl_boot, clid->cl_id); | |
6159 | ||
6160 | status = lookup_clientid(clid, cstate, nn); | |
6161 | if (status) | |
6162 | return status; | |
6163 | ||
6164 | clp = cstate->clp; | |
6165 | /* Find the matching lock stateowner */ | |
6166 | spin_lock(&clp->cl_lock); | |
6167 | list_for_each_entry(sop, &clp->cl_ownerstr_hashtbl[hashval], | |
6168 | so_strhash) { | |
6169 | ||
6170 | if (sop->so_is_open_owner || !same_owner_str(sop, owner)) | |
6171 | continue; | |
6172 | ||
6173 | /* see if there are still any locks associated with it */ | |
6174 | lo = lockowner(sop); | |
6175 | list_for_each_entry(stp, &sop->so_stateids, st_perstateowner) { | |
6176 | if (check_for_locks(stp->st_stid.sc_file, lo)) { | |
6177 | status = nfserr_locks_held; | |
6178 | spin_unlock(&clp->cl_lock); | |
6179 | return status; | |
6180 | } | |
6181 | } | |
6182 | ||
6183 | nfs4_get_stateowner(sop); | |
6184 | break; | |
6185 | } | |
6186 | if (!lo) { | |
6187 | spin_unlock(&clp->cl_lock); | |
6188 | return status; | |
6189 | } | |
6190 | ||
6191 | unhash_lockowner_locked(lo); | |
6192 | while (!list_empty(&lo->lo_owner.so_stateids)) { | |
6193 | stp = list_first_entry(&lo->lo_owner.so_stateids, | |
6194 | struct nfs4_ol_stateid, | |
6195 | st_perstateowner); | |
6196 | WARN_ON(!unhash_lock_stateid(stp)); | |
6197 | put_ol_stateid_locked(stp, &reaplist); | |
6198 | } | |
6199 | spin_unlock(&clp->cl_lock); | |
6200 | free_ol_stateid_reaplist(&reaplist); | |
6201 | nfs4_put_stateowner(&lo->lo_owner); | |
6202 | ||
6203 | return status; | |
6204 | } | |
6205 | ||
6206 | static inline struct nfs4_client_reclaim * | |
6207 | alloc_reclaim(void) | |
6208 | { | |
6209 | return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL); | |
6210 | } | |
6211 | ||
6212 | bool | |
6213 | nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn) | |
6214 | { | |
6215 | struct nfs4_client_reclaim *crp; | |
6216 | ||
6217 | crp = nfsd4_find_reclaim_client(name, nn); | |
6218 | return (crp && crp->cr_clp); | |
6219 | } | |
6220 | ||
6221 | /* | |
6222 | * failure => all reset bets are off, nfserr_no_grace... | |
6223 | */ | |
6224 | struct nfs4_client_reclaim * | |
6225 | nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn) | |
6226 | { | |
6227 | unsigned int strhashval; | |
6228 | struct nfs4_client_reclaim *crp; | |
6229 | ||
6230 | dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name); | |
6231 | crp = alloc_reclaim(); | |
6232 | if (crp) { | |
6233 | strhashval = clientstr_hashval(name); | |
6234 | INIT_LIST_HEAD(&crp->cr_strhash); | |
6235 | list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]); | |
6236 | memcpy(crp->cr_recdir, name, HEXDIR_LEN); | |
6237 | crp->cr_clp = NULL; | |
6238 | nn->reclaim_str_hashtbl_size++; | |
6239 | } | |
6240 | return crp; | |
6241 | } | |
6242 | ||
6243 | void | |
6244 | nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn) | |
6245 | { | |
6246 | list_del(&crp->cr_strhash); | |
6247 | kfree(crp); | |
6248 | nn->reclaim_str_hashtbl_size--; | |
6249 | } | |
6250 | ||
6251 | void | |
6252 | nfs4_release_reclaim(struct nfsd_net *nn) | |
6253 | { | |
6254 | struct nfs4_client_reclaim *crp = NULL; | |
6255 | int i; | |
6256 | ||
6257 | for (i = 0; i < CLIENT_HASH_SIZE; i++) { | |
6258 | while (!list_empty(&nn->reclaim_str_hashtbl[i])) { | |
6259 | crp = list_entry(nn->reclaim_str_hashtbl[i].next, | |
6260 | struct nfs4_client_reclaim, cr_strhash); | |
6261 | nfs4_remove_reclaim_record(crp, nn); | |
6262 | } | |
6263 | } | |
6264 | WARN_ON_ONCE(nn->reclaim_str_hashtbl_size); | |
6265 | } | |
6266 | ||
6267 | /* | |
6268 | * called from OPEN, CLAIM_PREVIOUS with a new clientid. */ | |
6269 | struct nfs4_client_reclaim * | |
6270 | nfsd4_find_reclaim_client(const char *recdir, struct nfsd_net *nn) | |
6271 | { | |
6272 | unsigned int strhashval; | |
6273 | struct nfs4_client_reclaim *crp = NULL; | |
6274 | ||
6275 | dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir); | |
6276 | ||
6277 | strhashval = clientstr_hashval(recdir); | |
6278 | list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) { | |
6279 | if (same_name(crp->cr_recdir, recdir)) { | |
6280 | return crp; | |
6281 | } | |
6282 | } | |
6283 | return NULL; | |
6284 | } | |
6285 | ||
6286 | /* | |
6287 | * Called from OPEN. Look for clientid in reclaim list. | |
6288 | */ | |
6289 | __be32 | |
6290 | nfs4_check_open_reclaim(clientid_t *clid, | |
6291 | struct nfsd4_compound_state *cstate, | |
6292 | struct nfsd_net *nn) | |
6293 | { | |
6294 | __be32 status; | |
6295 | ||
6296 | /* find clientid in conf_id_hashtbl */ | |
6297 | status = lookup_clientid(clid, cstate, nn); | |
6298 | if (status) | |
6299 | return nfserr_reclaim_bad; | |
6300 | ||
6301 | if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &cstate->clp->cl_flags)) | |
6302 | return nfserr_no_grace; | |
6303 | ||
6304 | if (nfsd4_client_record_check(cstate->clp)) | |
6305 | return nfserr_reclaim_bad; | |
6306 | ||
6307 | return nfs_ok; | |
6308 | } | |
6309 | ||
6310 | #ifdef CONFIG_NFSD_FAULT_INJECTION | |
6311 | static inline void | |
6312 | put_client(struct nfs4_client *clp) | |
6313 | { | |
6314 | atomic_dec(&clp->cl_refcount); | |
6315 | } | |
6316 | ||
6317 | static struct nfs4_client * | |
6318 | nfsd_find_client(struct sockaddr_storage *addr, size_t addr_size) | |
6319 | { | |
6320 | struct nfs4_client *clp; | |
6321 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6322 | nfsd_net_id); | |
6323 | ||
6324 | if (!nfsd_netns_ready(nn)) | |
6325 | return NULL; | |
6326 | ||
6327 | list_for_each_entry(clp, &nn->client_lru, cl_lru) { | |
6328 | if (memcmp(&clp->cl_addr, addr, addr_size) == 0) | |
6329 | return clp; | |
6330 | } | |
6331 | return NULL; | |
6332 | } | |
6333 | ||
6334 | u64 | |
6335 | nfsd_inject_print_clients(void) | |
6336 | { | |
6337 | struct nfs4_client *clp; | |
6338 | u64 count = 0; | |
6339 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6340 | nfsd_net_id); | |
6341 | char buf[INET6_ADDRSTRLEN]; | |
6342 | ||
6343 | if (!nfsd_netns_ready(nn)) | |
6344 | return 0; | |
6345 | ||
6346 | spin_lock(&nn->client_lock); | |
6347 | list_for_each_entry(clp, &nn->client_lru, cl_lru) { | |
6348 | rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf)); | |
6349 | pr_info("NFS Client: %s\n", buf); | |
6350 | ++count; | |
6351 | } | |
6352 | spin_unlock(&nn->client_lock); | |
6353 | ||
6354 | return count; | |
6355 | } | |
6356 | ||
6357 | u64 | |
6358 | nfsd_inject_forget_client(struct sockaddr_storage *addr, size_t addr_size) | |
6359 | { | |
6360 | u64 count = 0; | |
6361 | struct nfs4_client *clp; | |
6362 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6363 | nfsd_net_id); | |
6364 | ||
6365 | if (!nfsd_netns_ready(nn)) | |
6366 | return count; | |
6367 | ||
6368 | spin_lock(&nn->client_lock); | |
6369 | clp = nfsd_find_client(addr, addr_size); | |
6370 | if (clp) { | |
6371 | if (mark_client_expired_locked(clp) == nfs_ok) | |
6372 | ++count; | |
6373 | else | |
6374 | clp = NULL; | |
6375 | } | |
6376 | spin_unlock(&nn->client_lock); | |
6377 | ||
6378 | if (clp) | |
6379 | expire_client(clp); | |
6380 | ||
6381 | return count; | |
6382 | } | |
6383 | ||
6384 | u64 | |
6385 | nfsd_inject_forget_clients(u64 max) | |
6386 | { | |
6387 | u64 count = 0; | |
6388 | struct nfs4_client *clp, *next; | |
6389 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6390 | nfsd_net_id); | |
6391 | LIST_HEAD(reaplist); | |
6392 | ||
6393 | if (!nfsd_netns_ready(nn)) | |
6394 | return count; | |
6395 | ||
6396 | spin_lock(&nn->client_lock); | |
6397 | list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) { | |
6398 | if (mark_client_expired_locked(clp) == nfs_ok) { | |
6399 | list_add(&clp->cl_lru, &reaplist); | |
6400 | if (max != 0 && ++count >= max) | |
6401 | break; | |
6402 | } | |
6403 | } | |
6404 | spin_unlock(&nn->client_lock); | |
6405 | ||
6406 | list_for_each_entry_safe(clp, next, &reaplist, cl_lru) | |
6407 | expire_client(clp); | |
6408 | ||
6409 | return count; | |
6410 | } | |
6411 | ||
6412 | static void nfsd_print_count(struct nfs4_client *clp, unsigned int count, | |
6413 | const char *type) | |
6414 | { | |
6415 | char buf[INET6_ADDRSTRLEN]; | |
6416 | rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf)); | |
6417 | printk(KERN_INFO "NFS Client: %s has %u %s\n", buf, count, type); | |
6418 | } | |
6419 | ||
6420 | static void | |
6421 | nfsd_inject_add_lock_to_list(struct nfs4_ol_stateid *lst, | |
6422 | struct list_head *collect) | |
6423 | { | |
6424 | struct nfs4_client *clp = lst->st_stid.sc_client; | |
6425 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6426 | nfsd_net_id); | |
6427 | ||
6428 | if (!collect) | |
6429 | return; | |
6430 | ||
6431 | lockdep_assert_held(&nn->client_lock); | |
6432 | atomic_inc(&clp->cl_refcount); | |
6433 | list_add(&lst->st_locks, collect); | |
6434 | } | |
6435 | ||
6436 | static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max, | |
6437 | struct list_head *collect, | |
6438 | bool (*func)(struct nfs4_ol_stateid *)) | |
6439 | { | |
6440 | struct nfs4_openowner *oop; | |
6441 | struct nfs4_ol_stateid *stp, *st_next; | |
6442 | struct nfs4_ol_stateid *lst, *lst_next; | |
6443 | u64 count = 0; | |
6444 | ||
6445 | spin_lock(&clp->cl_lock); | |
6446 | list_for_each_entry(oop, &clp->cl_openowners, oo_perclient) { | |
6447 | list_for_each_entry_safe(stp, st_next, | |
6448 | &oop->oo_owner.so_stateids, st_perstateowner) { | |
6449 | list_for_each_entry_safe(lst, lst_next, | |
6450 | &stp->st_locks, st_locks) { | |
6451 | if (func) { | |
6452 | if (func(lst)) | |
6453 | nfsd_inject_add_lock_to_list(lst, | |
6454 | collect); | |
6455 | } | |
6456 | ++count; | |
6457 | /* | |
6458 | * Despite the fact that these functions deal | |
6459 | * with 64-bit integers for "count", we must | |
6460 | * ensure that it doesn't blow up the | |
6461 | * clp->cl_refcount. Throw a warning if we | |
6462 | * start to approach INT_MAX here. | |
6463 | */ | |
6464 | WARN_ON_ONCE(count == (INT_MAX / 2)); | |
6465 | if (count == max) | |
6466 | goto out; | |
6467 | } | |
6468 | } | |
6469 | } | |
6470 | out: | |
6471 | spin_unlock(&clp->cl_lock); | |
6472 | ||
6473 | return count; | |
6474 | } | |
6475 | ||
6476 | static u64 | |
6477 | nfsd_collect_client_locks(struct nfs4_client *clp, struct list_head *collect, | |
6478 | u64 max) | |
6479 | { | |
6480 | return nfsd_foreach_client_lock(clp, max, collect, unhash_lock_stateid); | |
6481 | } | |
6482 | ||
6483 | static u64 | |
6484 | nfsd_print_client_locks(struct nfs4_client *clp) | |
6485 | { | |
6486 | u64 count = nfsd_foreach_client_lock(clp, 0, NULL, NULL); | |
6487 | nfsd_print_count(clp, count, "locked files"); | |
6488 | return count; | |
6489 | } | |
6490 | ||
6491 | u64 | |
6492 | nfsd_inject_print_locks(void) | |
6493 | { | |
6494 | struct nfs4_client *clp; | |
6495 | u64 count = 0; | |
6496 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6497 | nfsd_net_id); | |
6498 | ||
6499 | if (!nfsd_netns_ready(nn)) | |
6500 | return 0; | |
6501 | ||
6502 | spin_lock(&nn->client_lock); | |
6503 | list_for_each_entry(clp, &nn->client_lru, cl_lru) | |
6504 | count += nfsd_print_client_locks(clp); | |
6505 | spin_unlock(&nn->client_lock); | |
6506 | ||
6507 | return count; | |
6508 | } | |
6509 | ||
6510 | static void | |
6511 | nfsd_reap_locks(struct list_head *reaplist) | |
6512 | { | |
6513 | struct nfs4_client *clp; | |
6514 | struct nfs4_ol_stateid *stp, *next; | |
6515 | ||
6516 | list_for_each_entry_safe(stp, next, reaplist, st_locks) { | |
6517 | list_del_init(&stp->st_locks); | |
6518 | clp = stp->st_stid.sc_client; | |
6519 | nfs4_put_stid(&stp->st_stid); | |
6520 | put_client(clp); | |
6521 | } | |
6522 | } | |
6523 | ||
6524 | u64 | |
6525 | nfsd_inject_forget_client_locks(struct sockaddr_storage *addr, size_t addr_size) | |
6526 | { | |
6527 | unsigned int count = 0; | |
6528 | struct nfs4_client *clp; | |
6529 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6530 | nfsd_net_id); | |
6531 | LIST_HEAD(reaplist); | |
6532 | ||
6533 | if (!nfsd_netns_ready(nn)) | |
6534 | return count; | |
6535 | ||
6536 | spin_lock(&nn->client_lock); | |
6537 | clp = nfsd_find_client(addr, addr_size); | |
6538 | if (clp) | |
6539 | count = nfsd_collect_client_locks(clp, &reaplist, 0); | |
6540 | spin_unlock(&nn->client_lock); | |
6541 | nfsd_reap_locks(&reaplist); | |
6542 | return count; | |
6543 | } | |
6544 | ||
6545 | u64 | |
6546 | nfsd_inject_forget_locks(u64 max) | |
6547 | { | |
6548 | u64 count = 0; | |
6549 | struct nfs4_client *clp; | |
6550 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6551 | nfsd_net_id); | |
6552 | LIST_HEAD(reaplist); | |
6553 | ||
6554 | if (!nfsd_netns_ready(nn)) | |
6555 | return count; | |
6556 | ||
6557 | spin_lock(&nn->client_lock); | |
6558 | list_for_each_entry(clp, &nn->client_lru, cl_lru) { | |
6559 | count += nfsd_collect_client_locks(clp, &reaplist, max - count); | |
6560 | if (max != 0 && count >= max) | |
6561 | break; | |
6562 | } | |
6563 | spin_unlock(&nn->client_lock); | |
6564 | nfsd_reap_locks(&reaplist); | |
6565 | return count; | |
6566 | } | |
6567 | ||
6568 | static u64 | |
6569 | nfsd_foreach_client_openowner(struct nfs4_client *clp, u64 max, | |
6570 | struct list_head *collect, | |
6571 | void (*func)(struct nfs4_openowner *)) | |
6572 | { | |
6573 | struct nfs4_openowner *oop, *next; | |
6574 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6575 | nfsd_net_id); | |
6576 | u64 count = 0; | |
6577 | ||
6578 | lockdep_assert_held(&nn->client_lock); | |
6579 | ||
6580 | spin_lock(&clp->cl_lock); | |
6581 | list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) { | |
6582 | if (func) { | |
6583 | func(oop); | |
6584 | if (collect) { | |
6585 | atomic_inc(&clp->cl_refcount); | |
6586 | list_add(&oop->oo_perclient, collect); | |
6587 | } | |
6588 | } | |
6589 | ++count; | |
6590 | /* | |
6591 | * Despite the fact that these functions deal with | |
6592 | * 64-bit integers for "count", we must ensure that | |
6593 | * it doesn't blow up the clp->cl_refcount. Throw a | |
6594 | * warning if we start to approach INT_MAX here. | |
6595 | */ | |
6596 | WARN_ON_ONCE(count == (INT_MAX / 2)); | |
6597 | if (count == max) | |
6598 | break; | |
6599 | } | |
6600 | spin_unlock(&clp->cl_lock); | |
6601 | ||
6602 | return count; | |
6603 | } | |
6604 | ||
6605 | static u64 | |
6606 | nfsd_print_client_openowners(struct nfs4_client *clp) | |
6607 | { | |
6608 | u64 count = nfsd_foreach_client_openowner(clp, 0, NULL, NULL); | |
6609 | ||
6610 | nfsd_print_count(clp, count, "openowners"); | |
6611 | return count; | |
6612 | } | |
6613 | ||
6614 | static u64 | |
6615 | nfsd_collect_client_openowners(struct nfs4_client *clp, | |
6616 | struct list_head *collect, u64 max) | |
6617 | { | |
6618 | return nfsd_foreach_client_openowner(clp, max, collect, | |
6619 | unhash_openowner_locked); | |
6620 | } | |
6621 | ||
6622 | u64 | |
6623 | nfsd_inject_print_openowners(void) | |
6624 | { | |
6625 | struct nfs4_client *clp; | |
6626 | u64 count = 0; | |
6627 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6628 | nfsd_net_id); | |
6629 | ||
6630 | if (!nfsd_netns_ready(nn)) | |
6631 | return 0; | |
6632 | ||
6633 | spin_lock(&nn->client_lock); | |
6634 | list_for_each_entry(clp, &nn->client_lru, cl_lru) | |
6635 | count += nfsd_print_client_openowners(clp); | |
6636 | spin_unlock(&nn->client_lock); | |
6637 | ||
6638 | return count; | |
6639 | } | |
6640 | ||
6641 | static void | |
6642 | nfsd_reap_openowners(struct list_head *reaplist) | |
6643 | { | |
6644 | struct nfs4_client *clp; | |
6645 | struct nfs4_openowner *oop, *next; | |
6646 | ||
6647 | list_for_each_entry_safe(oop, next, reaplist, oo_perclient) { | |
6648 | list_del_init(&oop->oo_perclient); | |
6649 | clp = oop->oo_owner.so_client; | |
6650 | release_openowner(oop); | |
6651 | put_client(clp); | |
6652 | } | |
6653 | } | |
6654 | ||
6655 | u64 | |
6656 | nfsd_inject_forget_client_openowners(struct sockaddr_storage *addr, | |
6657 | size_t addr_size) | |
6658 | { | |
6659 | unsigned int count = 0; | |
6660 | struct nfs4_client *clp; | |
6661 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6662 | nfsd_net_id); | |
6663 | LIST_HEAD(reaplist); | |
6664 | ||
6665 | if (!nfsd_netns_ready(nn)) | |
6666 | return count; | |
6667 | ||
6668 | spin_lock(&nn->client_lock); | |
6669 | clp = nfsd_find_client(addr, addr_size); | |
6670 | if (clp) | |
6671 | count = nfsd_collect_client_openowners(clp, &reaplist, 0); | |
6672 | spin_unlock(&nn->client_lock); | |
6673 | nfsd_reap_openowners(&reaplist); | |
6674 | return count; | |
6675 | } | |
6676 | ||
6677 | u64 | |
6678 | nfsd_inject_forget_openowners(u64 max) | |
6679 | { | |
6680 | u64 count = 0; | |
6681 | struct nfs4_client *clp; | |
6682 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6683 | nfsd_net_id); | |
6684 | LIST_HEAD(reaplist); | |
6685 | ||
6686 | if (!nfsd_netns_ready(nn)) | |
6687 | return count; | |
6688 | ||
6689 | spin_lock(&nn->client_lock); | |
6690 | list_for_each_entry(clp, &nn->client_lru, cl_lru) { | |
6691 | count += nfsd_collect_client_openowners(clp, &reaplist, | |
6692 | max - count); | |
6693 | if (max != 0 && count >= max) | |
6694 | break; | |
6695 | } | |
6696 | spin_unlock(&nn->client_lock); | |
6697 | nfsd_reap_openowners(&reaplist); | |
6698 | return count; | |
6699 | } | |
6700 | ||
6701 | static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max, | |
6702 | struct list_head *victims) | |
6703 | { | |
6704 | struct nfs4_delegation *dp, *next; | |
6705 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6706 | nfsd_net_id); | |
6707 | u64 count = 0; | |
6708 | ||
6709 | lockdep_assert_held(&nn->client_lock); | |
6710 | ||
6711 | spin_lock(&state_lock); | |
6712 | list_for_each_entry_safe(dp, next, &clp->cl_delegations, dl_perclnt) { | |
6713 | if (victims) { | |
6714 | /* | |
6715 | * It's not safe to mess with delegations that have a | |
6716 | * non-zero dl_time. They might have already been broken | |
6717 | * and could be processed by the laundromat outside of | |
6718 | * the state_lock. Just leave them be. | |
6719 | */ | |
6720 | if (dp->dl_time != 0) | |
6721 | continue; | |
6722 | ||
6723 | atomic_inc(&clp->cl_refcount); | |
6724 | WARN_ON(!unhash_delegation_locked(dp)); | |
6725 | list_add(&dp->dl_recall_lru, victims); | |
6726 | } | |
6727 | ++count; | |
6728 | /* | |
6729 | * Despite the fact that these functions deal with | |
6730 | * 64-bit integers for "count", we must ensure that | |
6731 | * it doesn't blow up the clp->cl_refcount. Throw a | |
6732 | * warning if we start to approach INT_MAX here. | |
6733 | */ | |
6734 | WARN_ON_ONCE(count == (INT_MAX / 2)); | |
6735 | if (count == max) | |
6736 | break; | |
6737 | } | |
6738 | spin_unlock(&state_lock); | |
6739 | return count; | |
6740 | } | |
6741 | ||
6742 | static u64 | |
6743 | nfsd_print_client_delegations(struct nfs4_client *clp) | |
6744 | { | |
6745 | u64 count = nfsd_find_all_delegations(clp, 0, NULL); | |
6746 | ||
6747 | nfsd_print_count(clp, count, "delegations"); | |
6748 | return count; | |
6749 | } | |
6750 | ||
6751 | u64 | |
6752 | nfsd_inject_print_delegations(void) | |
6753 | { | |
6754 | struct nfs4_client *clp; | |
6755 | u64 count = 0; | |
6756 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6757 | nfsd_net_id); | |
6758 | ||
6759 | if (!nfsd_netns_ready(nn)) | |
6760 | return 0; | |
6761 | ||
6762 | spin_lock(&nn->client_lock); | |
6763 | list_for_each_entry(clp, &nn->client_lru, cl_lru) | |
6764 | count += nfsd_print_client_delegations(clp); | |
6765 | spin_unlock(&nn->client_lock); | |
6766 | ||
6767 | return count; | |
6768 | } | |
6769 | ||
6770 | static void | |
6771 | nfsd_forget_delegations(struct list_head *reaplist) | |
6772 | { | |
6773 | struct nfs4_client *clp; | |
6774 | struct nfs4_delegation *dp, *next; | |
6775 | ||
6776 | list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) { | |
6777 | list_del_init(&dp->dl_recall_lru); | |
6778 | clp = dp->dl_stid.sc_client; | |
6779 | revoke_delegation(dp); | |
6780 | put_client(clp); | |
6781 | } | |
6782 | } | |
6783 | ||
6784 | u64 | |
6785 | nfsd_inject_forget_client_delegations(struct sockaddr_storage *addr, | |
6786 | size_t addr_size) | |
6787 | { | |
6788 | u64 count = 0; | |
6789 | struct nfs4_client *clp; | |
6790 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6791 | nfsd_net_id); | |
6792 | LIST_HEAD(reaplist); | |
6793 | ||
6794 | if (!nfsd_netns_ready(nn)) | |
6795 | return count; | |
6796 | ||
6797 | spin_lock(&nn->client_lock); | |
6798 | clp = nfsd_find_client(addr, addr_size); | |
6799 | if (clp) | |
6800 | count = nfsd_find_all_delegations(clp, 0, &reaplist); | |
6801 | spin_unlock(&nn->client_lock); | |
6802 | ||
6803 | nfsd_forget_delegations(&reaplist); | |
6804 | return count; | |
6805 | } | |
6806 | ||
6807 | u64 | |
6808 | nfsd_inject_forget_delegations(u64 max) | |
6809 | { | |
6810 | u64 count = 0; | |
6811 | struct nfs4_client *clp; | |
6812 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6813 | nfsd_net_id); | |
6814 | LIST_HEAD(reaplist); | |
6815 | ||
6816 | if (!nfsd_netns_ready(nn)) | |
6817 | return count; | |
6818 | ||
6819 | spin_lock(&nn->client_lock); | |
6820 | list_for_each_entry(clp, &nn->client_lru, cl_lru) { | |
6821 | count += nfsd_find_all_delegations(clp, max - count, &reaplist); | |
6822 | if (max != 0 && count >= max) | |
6823 | break; | |
6824 | } | |
6825 | spin_unlock(&nn->client_lock); | |
6826 | nfsd_forget_delegations(&reaplist); | |
6827 | return count; | |
6828 | } | |
6829 | ||
6830 | static void | |
6831 | nfsd_recall_delegations(struct list_head *reaplist) | |
6832 | { | |
6833 | struct nfs4_client *clp; | |
6834 | struct nfs4_delegation *dp, *next; | |
6835 | ||
6836 | list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) { | |
6837 | list_del_init(&dp->dl_recall_lru); | |
6838 | clp = dp->dl_stid.sc_client; | |
6839 | /* | |
6840 | * We skipped all entries that had a zero dl_time before, | |
6841 | * so we can now reset the dl_time back to 0. If a delegation | |
6842 | * break comes in now, then it won't make any difference since | |
6843 | * we're recalling it either way. | |
6844 | */ | |
6845 | spin_lock(&state_lock); | |
6846 | dp->dl_time = 0; | |
6847 | spin_unlock(&state_lock); | |
6848 | nfsd_break_one_deleg(dp); | |
6849 | put_client(clp); | |
6850 | } | |
6851 | } | |
6852 | ||
6853 | u64 | |
6854 | nfsd_inject_recall_client_delegations(struct sockaddr_storage *addr, | |
6855 | size_t addr_size) | |
6856 | { | |
6857 | u64 count = 0; | |
6858 | struct nfs4_client *clp; | |
6859 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6860 | nfsd_net_id); | |
6861 | LIST_HEAD(reaplist); | |
6862 | ||
6863 | if (!nfsd_netns_ready(nn)) | |
6864 | return count; | |
6865 | ||
6866 | spin_lock(&nn->client_lock); | |
6867 | clp = nfsd_find_client(addr, addr_size); | |
6868 | if (clp) | |
6869 | count = nfsd_find_all_delegations(clp, 0, &reaplist); | |
6870 | spin_unlock(&nn->client_lock); | |
6871 | ||
6872 | nfsd_recall_delegations(&reaplist); | |
6873 | return count; | |
6874 | } | |
6875 | ||
6876 | u64 | |
6877 | nfsd_inject_recall_delegations(u64 max) | |
6878 | { | |
6879 | u64 count = 0; | |
6880 | struct nfs4_client *clp, *next; | |
6881 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, | |
6882 | nfsd_net_id); | |
6883 | LIST_HEAD(reaplist); | |
6884 | ||
6885 | if (!nfsd_netns_ready(nn)) | |
6886 | return count; | |
6887 | ||
6888 | spin_lock(&nn->client_lock); | |
6889 | list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) { | |
6890 | count += nfsd_find_all_delegations(clp, max - count, &reaplist); | |
6891 | if (max != 0 && ++count >= max) | |
6892 | break; | |
6893 | } | |
6894 | spin_unlock(&nn->client_lock); | |
6895 | nfsd_recall_delegations(&reaplist); | |
6896 | return count; | |
6897 | } | |
6898 | #endif /* CONFIG_NFSD_FAULT_INJECTION */ | |
6899 | ||
6900 | /* | |
6901 | * Since the lifetime of a delegation isn't limited to that of an open, a | |
6902 | * client may quite reasonably hang on to a delegation as long as it has | |
6903 | * the inode cached. This becomes an obvious problem the first time a | |
6904 | * client's inode cache approaches the size of the server's total memory. | |
6905 | * | |
6906 | * For now we avoid this problem by imposing a hard limit on the number | |
6907 | * of delegations, which varies according to the server's memory size. | |
6908 | */ | |
6909 | static void | |
6910 | set_max_delegations(void) | |
6911 | { | |
6912 | /* | |
6913 | * Allow at most 4 delegations per megabyte of RAM. Quick | |
6914 | * estimates suggest that in the worst case (where every delegation | |
6915 | * is for a different inode), a delegation could take about 1.5K, | |
6916 | * giving a worst case usage of about 6% of memory. | |
6917 | */ | |
6918 | max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT); | |
6919 | } | |
6920 | ||
6921 | static int nfs4_state_create_net(struct net *net) | |
6922 | { | |
6923 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
6924 | int i; | |
6925 | ||
6926 | nn->conf_id_hashtbl = kmalloc(sizeof(struct list_head) * | |
6927 | CLIENT_HASH_SIZE, GFP_KERNEL); | |
6928 | if (!nn->conf_id_hashtbl) | |
6929 | goto err; | |
6930 | nn->unconf_id_hashtbl = kmalloc(sizeof(struct list_head) * | |
6931 | CLIENT_HASH_SIZE, GFP_KERNEL); | |
6932 | if (!nn->unconf_id_hashtbl) | |
6933 | goto err_unconf_id; | |
6934 | nn->sessionid_hashtbl = kmalloc(sizeof(struct list_head) * | |
6935 | SESSION_HASH_SIZE, GFP_KERNEL); | |
6936 | if (!nn->sessionid_hashtbl) | |
6937 | goto err_sessionid; | |
6938 | ||
6939 | for (i = 0; i < CLIENT_HASH_SIZE; i++) { | |
6940 | INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]); | |
6941 | INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]); | |
6942 | } | |
6943 | for (i = 0; i < SESSION_HASH_SIZE; i++) | |
6944 | INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]); | |
6945 | nn->conf_name_tree = RB_ROOT; | |
6946 | nn->unconf_name_tree = RB_ROOT; | |
6947 | INIT_LIST_HEAD(&nn->client_lru); | |
6948 | INIT_LIST_HEAD(&nn->close_lru); | |
6949 | INIT_LIST_HEAD(&nn->del_recall_lru); | |
6950 | spin_lock_init(&nn->client_lock); | |
6951 | ||
6952 | spin_lock_init(&nn->blocked_locks_lock); | |
6953 | INIT_LIST_HEAD(&nn->blocked_locks_lru); | |
6954 | ||
6955 | INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main); | |
6956 | get_net(net); | |
6957 | ||
6958 | return 0; | |
6959 | ||
6960 | err_sessionid: | |
6961 | kfree(nn->unconf_id_hashtbl); | |
6962 | err_unconf_id: | |
6963 | kfree(nn->conf_id_hashtbl); | |
6964 | err: | |
6965 | return -ENOMEM; | |
6966 | } | |
6967 | ||
6968 | static void | |
6969 | nfs4_state_destroy_net(struct net *net) | |
6970 | { | |
6971 | int i; | |
6972 | struct nfs4_client *clp = NULL; | |
6973 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
6974 | ||
6975 | for (i = 0; i < CLIENT_HASH_SIZE; i++) { | |
6976 | while (!list_empty(&nn->conf_id_hashtbl[i])) { | |
6977 | clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash); | |
6978 | destroy_client(clp); | |
6979 | } | |
6980 | } | |
6981 | ||
6982 | for (i = 0; i < CLIENT_HASH_SIZE; i++) { | |
6983 | while (!list_empty(&nn->unconf_id_hashtbl[i])) { | |
6984 | clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash); | |
6985 | destroy_client(clp); | |
6986 | } | |
6987 | } | |
6988 | ||
6989 | kfree(nn->sessionid_hashtbl); | |
6990 | kfree(nn->unconf_id_hashtbl); | |
6991 | kfree(nn->conf_id_hashtbl); | |
6992 | put_net(net); | |
6993 | } | |
6994 | ||
6995 | int | |
6996 | nfs4_state_start_net(struct net *net) | |
6997 | { | |
6998 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
6999 | int ret; | |
7000 | ||
7001 | ret = nfs4_state_create_net(net); | |
7002 | if (ret) | |
7003 | return ret; | |
7004 | nn->boot_time = get_seconds(); | |
7005 | nn->grace_ended = false; | |
7006 | nn->nfsd4_manager.block_opens = true; | |
7007 | locks_start_grace(net, &nn->nfsd4_manager); | |
7008 | nfsd4_client_tracking_init(net); | |
7009 | printk(KERN_INFO "NFSD: starting %ld-second grace period (net %p)\n", | |
7010 | nn->nfsd4_grace, net); | |
7011 | queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ); | |
7012 | return 0; | |
7013 | } | |
7014 | ||
7015 | /* initialization to perform when the nfsd service is started: */ | |
7016 | ||
7017 | int | |
7018 | nfs4_state_start(void) | |
7019 | { | |
7020 | int ret; | |
7021 | ||
7022 | ret = set_callback_cred(); | |
7023 | if (ret) | |
7024 | return ret; | |
7025 | ||
7026 | laundry_wq = alloc_workqueue("%s", WQ_UNBOUND, 0, "nfsd4"); | |
7027 | if (laundry_wq == NULL) { | |
7028 | ret = -ENOMEM; | |
7029 | goto out_cleanup_cred; | |
7030 | } | |
7031 | ret = nfsd4_create_callback_queue(); | |
7032 | if (ret) | |
7033 | goto out_free_laundry; | |
7034 | ||
7035 | set_max_delegations(); | |
7036 | return 0; | |
7037 | ||
7038 | out_free_laundry: | |
7039 | destroy_workqueue(laundry_wq); | |
7040 | out_cleanup_cred: | |
7041 | cleanup_callback_cred(); | |
7042 | return ret; | |
7043 | } | |
7044 | ||
7045 | void | |
7046 | nfs4_state_shutdown_net(struct net *net) | |
7047 | { | |
7048 | struct nfs4_delegation *dp = NULL; | |
7049 | struct list_head *pos, *next, reaplist; | |
7050 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
7051 | struct nfsd4_blocked_lock *nbl; | |
7052 | ||
7053 | cancel_delayed_work_sync(&nn->laundromat_work); | |
7054 | locks_end_grace(&nn->nfsd4_manager); | |
7055 | ||
7056 | INIT_LIST_HEAD(&reaplist); | |
7057 | spin_lock(&state_lock); | |
7058 | list_for_each_safe(pos, next, &nn->del_recall_lru) { | |
7059 | dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); | |
7060 | WARN_ON(!unhash_delegation_locked(dp)); | |
7061 | list_add(&dp->dl_recall_lru, &reaplist); | |
7062 | } | |
7063 | spin_unlock(&state_lock); | |
7064 | list_for_each_safe(pos, next, &reaplist) { | |
7065 | dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); | |
7066 | list_del_init(&dp->dl_recall_lru); | |
7067 | put_clnt_odstate(dp->dl_clnt_odstate); | |
7068 | nfs4_put_deleg_lease(dp->dl_stid.sc_file); | |
7069 | nfs4_put_stid(&dp->dl_stid); | |
7070 | } | |
7071 | ||
7072 | BUG_ON(!list_empty(&reaplist)); | |
7073 | spin_lock(&nn->blocked_locks_lock); | |
7074 | while (!list_empty(&nn->blocked_locks_lru)) { | |
7075 | nbl = list_first_entry(&nn->blocked_locks_lru, | |
7076 | struct nfsd4_blocked_lock, nbl_lru); | |
7077 | list_move(&nbl->nbl_lru, &reaplist); | |
7078 | list_del_init(&nbl->nbl_list); | |
7079 | } | |
7080 | spin_unlock(&nn->blocked_locks_lock); | |
7081 | ||
7082 | while (!list_empty(&reaplist)) { | |
7083 | nbl = list_first_entry(&nn->blocked_locks_lru, | |
7084 | struct nfsd4_blocked_lock, nbl_lru); | |
7085 | list_del_init(&nbl->nbl_lru); | |
7086 | posix_unblock_lock(&nbl->nbl_lock); | |
7087 | free_blocked_lock(nbl); | |
7088 | } | |
7089 | ||
7090 | nfsd4_client_tracking_exit(net); | |
7091 | nfs4_state_destroy_net(net); | |
7092 | } | |
7093 | ||
7094 | void | |
7095 | nfs4_state_shutdown(void) | |
7096 | { | |
7097 | destroy_workqueue(laundry_wq); | |
7098 | nfsd4_destroy_callback_queue(); | |
7099 | cleanup_callback_cred(); | |
7100 | } | |
7101 | ||
7102 | static void | |
7103 | get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid) | |
7104 | { | |
7105 | if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid)) | |
7106 | memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t)); | |
7107 | } | |
7108 | ||
7109 | static void | |
7110 | put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid) | |
7111 | { | |
7112 | if (cstate->minorversion) { | |
7113 | memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t)); | |
7114 | SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG); | |
7115 | } | |
7116 | } | |
7117 | ||
7118 | void | |
7119 | clear_current_stateid(struct nfsd4_compound_state *cstate) | |
7120 | { | |
7121 | CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG); | |
7122 | } | |
7123 | ||
7124 | /* | |
7125 | * functions to set current state id | |
7126 | */ | |
7127 | void | |
7128 | nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, | |
7129 | union nfsd4_op_u *u) | |
7130 | { | |
7131 | put_stateid(cstate, &u->open_downgrade.od_stateid); | |
7132 | } | |
7133 | ||
7134 | void | |
7135 | nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, | |
7136 | union nfsd4_op_u *u) | |
7137 | { | |
7138 | put_stateid(cstate, &u->open.op_stateid); | |
7139 | } | |
7140 | ||
7141 | void | |
7142 | nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, | |
7143 | union nfsd4_op_u *u) | |
7144 | { | |
7145 | put_stateid(cstate, &u->close.cl_stateid); | |
7146 | } | |
7147 | ||
7148 | void | |
7149 | nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, | |
7150 | union nfsd4_op_u *u) | |
7151 | { | |
7152 | put_stateid(cstate, &u->lock.lk_resp_stateid); | |
7153 | } | |
7154 | ||
7155 | /* | |
7156 | * functions to consume current state id | |
7157 | */ | |
7158 | ||
7159 | void | |
7160 | nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, | |
7161 | union nfsd4_op_u *u) | |
7162 | { | |
7163 | get_stateid(cstate, &u->open_downgrade.od_stateid); | |
7164 | } | |
7165 | ||
7166 | void | |
7167 | nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, | |
7168 | union nfsd4_op_u *u) | |
7169 | { | |
7170 | get_stateid(cstate, &u->delegreturn.dr_stateid); | |
7171 | } | |
7172 | ||
7173 | void | |
7174 | nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, | |
7175 | union nfsd4_op_u *u) | |
7176 | { | |
7177 | get_stateid(cstate, &u->free_stateid.fr_stateid); | |
7178 | } | |
7179 | ||
7180 | void | |
7181 | nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, | |
7182 | union nfsd4_op_u *u) | |
7183 | { | |
7184 | get_stateid(cstate, &u->setattr.sa_stateid); | |
7185 | } | |
7186 | ||
7187 | void | |
7188 | nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, | |
7189 | union nfsd4_op_u *u) | |
7190 | { | |
7191 | get_stateid(cstate, &u->close.cl_stateid); | |
7192 | } | |
7193 | ||
7194 | void | |
7195 | nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, | |
7196 | union nfsd4_op_u *u) | |
7197 | { | |
7198 | get_stateid(cstate, &u->locku.lu_stateid); | |
7199 | } | |
7200 | ||
7201 | void | |
7202 | nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, | |
7203 | union nfsd4_op_u *u) | |
7204 | { | |
7205 | get_stateid(cstate, &u->read.rd_stateid); | |
7206 | } | |
7207 | ||
7208 | void | |
7209 | nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, | |
7210 | union nfsd4_op_u *u) | |
7211 | { | |
7212 | get_stateid(cstate, &u->write.wr_stateid); | |
7213 | } |