Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * net/sunrpc/cache.c | |
3 | * | |
4 | * Generic code for various authentication-related caches | |
5 | * used by sunrpc clients and servers. | |
6 | * | |
7 | * Copyright (C) 2002 Neil Brown <neilb@cse.unsw.edu.au> | |
8 | * | |
9 | * Released under terms in GPL version 2. See COPYING. | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/types.h> | |
14 | #include <linux/fs.h> | |
15 | #include <linux/file.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/signal.h> | |
18 | #include <linux/sched.h> | |
19 | #include <linux/kmod.h> | |
20 | #include <linux/list.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/ctype.h> | |
23 | #include <asm/uaccess.h> | |
24 | #include <linux/poll.h> | |
25 | #include <linux/seq_file.h> | |
26 | #include <linux/proc_fs.h> | |
27 | #include <linux/net.h> | |
28 | #include <linux/workqueue.h> | |
4a3e2f71 | 29 | #include <linux/mutex.h> |
da77005f | 30 | #include <linux/pagemap.h> |
99df95a2 | 31 | #include <linux/smp_lock.h> |
1da177e4 LT |
32 | #include <asm/ioctls.h> |
33 | #include <linux/sunrpc/types.h> | |
34 | #include <linux/sunrpc/cache.h> | |
35 | #include <linux/sunrpc/stats.h> | |
8854e82d | 36 | #include <linux/sunrpc/rpc_pipe_fs.h> |
4f42d0d5 | 37 | #include "netns.h" |
1da177e4 LT |
38 | |
39 | #define RPCDBG_FACILITY RPCDBG_CACHE | |
40 | ||
e0bb89ef | 41 | static int cache_defer_req(struct cache_req *req, struct cache_head *item); |
1da177e4 LT |
42 | static void cache_revisit_request(struct cache_head *item); |
43 | ||
74cae61a | 44 | static void cache_init(struct cache_head *h) |
1da177e4 | 45 | { |
c5b29f88 | 46 | time_t now = seconds_since_boot(); |
1da177e4 LT |
47 | h->next = NULL; |
48 | h->flags = 0; | |
baab935f | 49 | kref_init(&h->ref); |
1da177e4 LT |
50 | h->expiry_time = now + CACHE_NEW_EXPIRY; |
51 | h->last_refresh = now; | |
52 | } | |
53 | ||
2f50d8b6 N |
54 | static inline int cache_is_expired(struct cache_detail *detail, struct cache_head *h) |
55 | { | |
c5b29f88 | 56 | return (h->expiry_time < seconds_since_boot()) || |
2f50d8b6 N |
57 | (detail->flush_time > h->last_refresh); |
58 | } | |
59 | ||
15a5f6bd N |
60 | struct cache_head *sunrpc_cache_lookup(struct cache_detail *detail, |
61 | struct cache_head *key, int hash) | |
62 | { | |
63 | struct cache_head **head, **hp; | |
d202cce8 | 64 | struct cache_head *new = NULL, *freeme = NULL; |
15a5f6bd N |
65 | |
66 | head = &detail->hash_table[hash]; | |
67 | ||
68 | read_lock(&detail->hash_lock); | |
69 | ||
70 | for (hp=head; *hp != NULL ; hp = &(*hp)->next) { | |
71 | struct cache_head *tmp = *hp; | |
72 | if (detail->match(tmp, key)) { | |
d202cce8 N |
73 | if (cache_is_expired(detail, tmp)) |
74 | /* This entry is expired, we will discard it. */ | |
75 | break; | |
15a5f6bd N |
76 | cache_get(tmp); |
77 | read_unlock(&detail->hash_lock); | |
78 | return tmp; | |
79 | } | |
80 | } | |
81 | read_unlock(&detail->hash_lock); | |
82 | /* Didn't find anything, insert an empty entry */ | |
83 | ||
84 | new = detail->alloc(); | |
85 | if (!new) | |
86 | return NULL; | |
2f34931f NB |
87 | /* must fully initialise 'new', else |
88 | * we might get lose if we need to | |
89 | * cache_put it soon. | |
90 | */ | |
15a5f6bd | 91 | cache_init(new); |
2f34931f | 92 | detail->init(new, key); |
15a5f6bd N |
93 | |
94 | write_lock(&detail->hash_lock); | |
95 | ||
96 | /* check if entry appeared while we slept */ | |
97 | for (hp=head; *hp != NULL ; hp = &(*hp)->next) { | |
98 | struct cache_head *tmp = *hp; | |
99 | if (detail->match(tmp, key)) { | |
d202cce8 N |
100 | if (cache_is_expired(detail, tmp)) { |
101 | *hp = tmp->next; | |
102 | tmp->next = NULL; | |
103 | detail->entries --; | |
104 | freeme = tmp; | |
105 | break; | |
106 | } | |
15a5f6bd N |
107 | cache_get(tmp); |
108 | write_unlock(&detail->hash_lock); | |
baab935f | 109 | cache_put(new, detail); |
15a5f6bd N |
110 | return tmp; |
111 | } | |
112 | } | |
15a5f6bd N |
113 | new->next = *head; |
114 | *head = new; | |
115 | detail->entries++; | |
116 | cache_get(new); | |
117 | write_unlock(&detail->hash_lock); | |
118 | ||
d202cce8 N |
119 | if (freeme) |
120 | cache_put(freeme, detail); | |
15a5f6bd N |
121 | return new; |
122 | } | |
24c3767e | 123 | EXPORT_SYMBOL_GPL(sunrpc_cache_lookup); |
15a5f6bd | 124 | |
ebd0cb1a | 125 | |
f866a819 | 126 | static void cache_dequeue(struct cache_detail *detail, struct cache_head *ch); |
ebd0cb1a | 127 | |
908329f2 | 128 | static void cache_fresh_locked(struct cache_head *head, time_t expiry) |
ebd0cb1a N |
129 | { |
130 | head->expiry_time = expiry; | |
c5b29f88 | 131 | head->last_refresh = seconds_since_boot(); |
908329f2 | 132 | set_bit(CACHE_VALID, &head->flags); |
ebd0cb1a N |
133 | } |
134 | ||
135 | static void cache_fresh_unlocked(struct cache_head *head, | |
908329f2 | 136 | struct cache_detail *detail) |
ebd0cb1a | 137 | { |
ebd0cb1a N |
138 | if (test_and_clear_bit(CACHE_PENDING, &head->flags)) { |
139 | cache_revisit_request(head); | |
f866a819 | 140 | cache_dequeue(detail, head); |
ebd0cb1a N |
141 | } |
142 | } | |
143 | ||
15a5f6bd N |
144 | struct cache_head *sunrpc_cache_update(struct cache_detail *detail, |
145 | struct cache_head *new, struct cache_head *old, int hash) | |
146 | { | |
147 | /* The 'old' entry is to be replaced by 'new'. | |
148 | * If 'old' is not VALID, we update it directly, | |
149 | * otherwise we need to replace it | |
150 | */ | |
151 | struct cache_head **head; | |
152 | struct cache_head *tmp; | |
153 | ||
154 | if (!test_bit(CACHE_VALID, &old->flags)) { | |
155 | write_lock(&detail->hash_lock); | |
156 | if (!test_bit(CACHE_VALID, &old->flags)) { | |
157 | if (test_bit(CACHE_NEGATIVE, &new->flags)) | |
158 | set_bit(CACHE_NEGATIVE, &old->flags); | |
159 | else | |
160 | detail->update(old, new); | |
908329f2 | 161 | cache_fresh_locked(old, new->expiry_time); |
15a5f6bd | 162 | write_unlock(&detail->hash_lock); |
908329f2 | 163 | cache_fresh_unlocked(old, detail); |
15a5f6bd N |
164 | return old; |
165 | } | |
166 | write_unlock(&detail->hash_lock); | |
167 | } | |
168 | /* We need to insert a new entry */ | |
169 | tmp = detail->alloc(); | |
170 | if (!tmp) { | |
baab935f | 171 | cache_put(old, detail); |
15a5f6bd N |
172 | return NULL; |
173 | } | |
174 | cache_init(tmp); | |
175 | detail->init(tmp, old); | |
176 | head = &detail->hash_table[hash]; | |
177 | ||
178 | write_lock(&detail->hash_lock); | |
179 | if (test_bit(CACHE_NEGATIVE, &new->flags)) | |
180 | set_bit(CACHE_NEGATIVE, &tmp->flags); | |
181 | else | |
182 | detail->update(tmp, new); | |
183 | tmp->next = *head; | |
184 | *head = tmp; | |
f2d39586 | 185 | detail->entries++; |
15a5f6bd | 186 | cache_get(tmp); |
908329f2 | 187 | cache_fresh_locked(tmp, new->expiry_time); |
ebd0cb1a | 188 | cache_fresh_locked(old, 0); |
15a5f6bd | 189 | write_unlock(&detail->hash_lock); |
908329f2 N |
190 | cache_fresh_unlocked(tmp, detail); |
191 | cache_fresh_unlocked(old, detail); | |
baab935f | 192 | cache_put(old, detail); |
15a5f6bd N |
193 | return tmp; |
194 | } | |
24c3767e | 195 | EXPORT_SYMBOL_GPL(sunrpc_cache_update); |
1da177e4 | 196 | |
bc74b4f5 TM |
197 | static int cache_make_upcall(struct cache_detail *cd, struct cache_head *h) |
198 | { | |
199 | if (!cd->cache_upcall) | |
200 | return -EINVAL; | |
201 | return cd->cache_upcall(cd, h); | |
202 | } | |
989a19b9 N |
203 | |
204 | static inline int cache_is_valid(struct cache_detail *detail, struct cache_head *h) | |
205 | { | |
d202cce8 | 206 | if (!test_bit(CACHE_VALID, &h->flags)) |
989a19b9 N |
207 | return -EAGAIN; |
208 | else { | |
209 | /* entry is valid */ | |
210 | if (test_bit(CACHE_NEGATIVE, &h->flags)) | |
211 | return -ENOENT; | |
212 | else | |
213 | return 0; | |
214 | } | |
215 | } | |
e9dc1221 | 216 | |
1da177e4 LT |
217 | /* |
218 | * This is the generic cache management routine for all | |
219 | * the authentication caches. | |
220 | * It checks the currency of a cache item and will (later) | |
221 | * initiate an upcall to fill it if needed. | |
222 | * | |
223 | * | |
224 | * Returns 0 if the cache_head can be used, or cache_puts it and returns | |
989a19b9 N |
225 | * -EAGAIN if upcall is pending and request has been queued |
226 | * -ETIMEDOUT if upcall failed or request could not be queue or | |
227 | * upcall completed but item is still invalid (implying that | |
228 | * the cache item has been replaced with a newer one). | |
1da177e4 LT |
229 | * -ENOENT if cache entry was negative |
230 | */ | |
231 | int cache_check(struct cache_detail *detail, | |
232 | struct cache_head *h, struct cache_req *rqstp) | |
233 | { | |
234 | int rv; | |
235 | long refresh_age, age; | |
236 | ||
237 | /* First decide return status as best we can */ | |
989a19b9 | 238 | rv = cache_is_valid(detail, h); |
1da177e4 LT |
239 | |
240 | /* now see if we want to start an upcall */ | |
241 | refresh_age = (h->expiry_time - h->last_refresh); | |
c5b29f88 | 242 | age = seconds_since_boot() - h->last_refresh; |
1da177e4 LT |
243 | |
244 | if (rqstp == NULL) { | |
245 | if (rv == -EAGAIN) | |
246 | rv = -ENOENT; | |
247 | } else if (rv == -EAGAIN || age > refresh_age/2) { | |
46121cf7 CL |
248 | dprintk("RPC: Want update, refage=%ld, age=%ld\n", |
249 | refresh_age, age); | |
1da177e4 LT |
250 | if (!test_and_set_bit(CACHE_PENDING, &h->flags)) { |
251 | switch (cache_make_upcall(detail, h)) { | |
252 | case -EINVAL: | |
253 | clear_bit(CACHE_PENDING, &h->flags); | |
5c4d2639 | 254 | cache_revisit_request(h); |
1da177e4 LT |
255 | if (rv == -EAGAIN) { |
256 | set_bit(CACHE_NEGATIVE, &h->flags); | |
c5b29f88 | 257 | cache_fresh_locked(h, seconds_since_boot()+CACHE_NEW_EXPIRY); |
908329f2 | 258 | cache_fresh_unlocked(h, detail); |
1da177e4 LT |
259 | rv = -ENOENT; |
260 | } | |
261 | break; | |
262 | ||
263 | case -EAGAIN: | |
264 | clear_bit(CACHE_PENDING, &h->flags); | |
265 | cache_revisit_request(h); | |
266 | break; | |
267 | } | |
268 | } | |
269 | } | |
270 | ||
989a19b9 | 271 | if (rv == -EAGAIN) { |
9e4c6379 | 272 | if (cache_defer_req(rqstp, h) < 0) { |
989a19b9 N |
273 | /* Request is not deferred */ |
274 | rv = cache_is_valid(detail, h); | |
275 | if (rv == -EAGAIN) | |
276 | rv = -ETIMEDOUT; | |
277 | } | |
278 | } | |
4013edea | 279 | if (rv) |
baab935f | 280 | cache_put(h, detail); |
1da177e4 LT |
281 | return rv; |
282 | } | |
24c3767e | 283 | EXPORT_SYMBOL_GPL(cache_check); |
1da177e4 | 284 | |
1da177e4 LT |
285 | /* |
286 | * caches need to be periodically cleaned. | |
287 | * For this we maintain a list of cache_detail and | |
288 | * a current pointer into that list and into the table | |
289 | * for that entry. | |
290 | * | |
291 | * Each time clean_cache is called it finds the next non-empty entry | |
292 | * in the current table and walks the list in that entry | |
293 | * looking for entries that can be removed. | |
294 | * | |
295 | * An entry gets removed if: | |
296 | * - The expiry is before current time | |
297 | * - The last_refresh time is before the flush_time for that cache | |
298 | * | |
299 | * later we might drop old entries with non-NEVER expiry if that table | |
300 | * is getting 'full' for some definition of 'full' | |
301 | * | |
302 | * The question of "how often to scan a table" is an interesting one | |
303 | * and is answered in part by the use of the "nextcheck" field in the | |
304 | * cache_detail. | |
305 | * When a scan of a table begins, the nextcheck field is set to a time | |
306 | * that is well into the future. | |
307 | * While scanning, if an expiry time is found that is earlier than the | |
308 | * current nextcheck time, nextcheck is set to that expiry time. | |
309 | * If the flush_time is ever set to a time earlier than the nextcheck | |
310 | * time, the nextcheck time is then set to that flush_time. | |
311 | * | |
312 | * A table is then only scanned if the current time is at least | |
313 | * the nextcheck time. | |
cca5172a | 314 | * |
1da177e4 LT |
315 | */ |
316 | ||
317 | static LIST_HEAD(cache_list); | |
318 | static DEFINE_SPINLOCK(cache_list_lock); | |
319 | static struct cache_detail *current_detail; | |
320 | static int current_index; | |
321 | ||
65f27f38 | 322 | static void do_cache_clean(struct work_struct *work); |
8eab945c | 323 | static struct delayed_work cache_cleaner; |
1da177e4 | 324 | |
5b7a1b9f | 325 | static void sunrpc_init_cache_detail(struct cache_detail *cd) |
ffe9386b | 326 | { |
1da177e4 LT |
327 | rwlock_init(&cd->hash_lock); |
328 | INIT_LIST_HEAD(&cd->queue); | |
329 | spin_lock(&cache_list_lock); | |
330 | cd->nextcheck = 0; | |
331 | cd->entries = 0; | |
332 | atomic_set(&cd->readers, 0); | |
333 | cd->last_close = 0; | |
334 | cd->last_warn = -1; | |
335 | list_add(&cd->others, &cache_list); | |
336 | spin_unlock(&cache_list_lock); | |
337 | ||
338 | /* start the cleaning process */ | |
52bad64d | 339 | schedule_delayed_work(&cache_cleaner, 0); |
1da177e4 LT |
340 | } |
341 | ||
5b7a1b9f | 342 | static void sunrpc_destroy_cache_detail(struct cache_detail *cd) |
1da177e4 LT |
343 | { |
344 | cache_purge(cd); | |
345 | spin_lock(&cache_list_lock); | |
346 | write_lock(&cd->hash_lock); | |
347 | if (cd->entries || atomic_read(&cd->inuse)) { | |
348 | write_unlock(&cd->hash_lock); | |
349 | spin_unlock(&cache_list_lock); | |
df95a9d4 | 350 | goto out; |
1da177e4 LT |
351 | } |
352 | if (current_detail == cd) | |
353 | current_detail = NULL; | |
354 | list_del_init(&cd->others); | |
355 | write_unlock(&cd->hash_lock); | |
356 | spin_unlock(&cache_list_lock); | |
1da177e4 LT |
357 | if (list_empty(&cache_list)) { |
358 | /* module must be being unloaded so its safe to kill the worker */ | |
4011cd97 | 359 | cancel_delayed_work_sync(&cache_cleaner); |
1da177e4 | 360 | } |
df95a9d4 BF |
361 | return; |
362 | out: | |
363 | printk(KERN_ERR "nfsd: failed to unregister %s cache\n", cd->name); | |
1da177e4 LT |
364 | } |
365 | ||
366 | /* clean cache tries to find something to clean | |
367 | * and cleans it. | |
368 | * It returns 1 if it cleaned something, | |
369 | * 0 if it didn't find anything this time | |
370 | * -1 if it fell off the end of the list. | |
371 | */ | |
372 | static int cache_clean(void) | |
373 | { | |
374 | int rv = 0; | |
375 | struct list_head *next; | |
376 | ||
377 | spin_lock(&cache_list_lock); | |
378 | ||
379 | /* find a suitable table if we don't already have one */ | |
380 | while (current_detail == NULL || | |
381 | current_index >= current_detail->hash_size) { | |
382 | if (current_detail) | |
383 | next = current_detail->others.next; | |
384 | else | |
385 | next = cache_list.next; | |
386 | if (next == &cache_list) { | |
387 | current_detail = NULL; | |
388 | spin_unlock(&cache_list_lock); | |
389 | return -1; | |
390 | } | |
391 | current_detail = list_entry(next, struct cache_detail, others); | |
c5b29f88 | 392 | if (current_detail->nextcheck > seconds_since_boot()) |
1da177e4 LT |
393 | current_index = current_detail->hash_size; |
394 | else { | |
395 | current_index = 0; | |
c5b29f88 | 396 | current_detail->nextcheck = seconds_since_boot()+30*60; |
1da177e4 LT |
397 | } |
398 | } | |
399 | ||
400 | /* find a non-empty bucket in the table */ | |
401 | while (current_detail && | |
402 | current_index < current_detail->hash_size && | |
403 | current_detail->hash_table[current_index] == NULL) | |
404 | current_index++; | |
405 | ||
406 | /* find a cleanable entry in the bucket and clean it, or set to next bucket */ | |
cca5172a | 407 | |
1da177e4 LT |
408 | if (current_detail && current_index < current_detail->hash_size) { |
409 | struct cache_head *ch, **cp; | |
410 | struct cache_detail *d; | |
cca5172a | 411 | |
1da177e4 LT |
412 | write_lock(¤t_detail->hash_lock); |
413 | ||
414 | /* Ok, now to clean this strand */ | |
cca5172a | 415 | |
1da177e4 | 416 | cp = & current_detail->hash_table[current_index]; |
3af4974e | 417 | for (ch = *cp ; ch ; cp = & ch->next, ch = *cp) { |
1da177e4 LT |
418 | if (current_detail->nextcheck > ch->expiry_time) |
419 | current_detail->nextcheck = ch->expiry_time+1; | |
2f50d8b6 | 420 | if (!cache_is_expired(current_detail, ch)) |
1da177e4 | 421 | continue; |
1da177e4 | 422 | |
1da177e4 LT |
423 | *cp = ch->next; |
424 | ch->next = NULL; | |
425 | current_detail->entries--; | |
426 | rv = 1; | |
3af4974e | 427 | break; |
1da177e4 | 428 | } |
3af4974e | 429 | |
1da177e4 LT |
430 | write_unlock(¤t_detail->hash_lock); |
431 | d = current_detail; | |
432 | if (!ch) | |
433 | current_index ++; | |
434 | spin_unlock(&cache_list_lock); | |
5c4d2639 | 435 | if (ch) { |
3af4974e N |
436 | if (test_and_clear_bit(CACHE_PENDING, &ch->flags)) |
437 | cache_dequeue(current_detail, ch); | |
5c4d2639 | 438 | cache_revisit_request(ch); |
baab935f | 439 | cache_put(ch, d); |
5c4d2639 | 440 | } |
1da177e4 LT |
441 | } else |
442 | spin_unlock(&cache_list_lock); | |
443 | ||
444 | return rv; | |
445 | } | |
446 | ||
447 | /* | |
448 | * We want to regularly clean the cache, so we need to schedule some work ... | |
449 | */ | |
65f27f38 | 450 | static void do_cache_clean(struct work_struct *work) |
1da177e4 LT |
451 | { |
452 | int delay = 5; | |
453 | if (cache_clean() == -1) | |
6aad89c8 | 454 | delay = round_jiffies_relative(30*HZ); |
1da177e4 LT |
455 | |
456 | if (list_empty(&cache_list)) | |
457 | delay = 0; | |
458 | ||
459 | if (delay) | |
460 | schedule_delayed_work(&cache_cleaner, delay); | |
461 | } | |
462 | ||
463 | ||
cca5172a | 464 | /* |
1da177e4 | 465 | * Clean all caches promptly. This just calls cache_clean |
cca5172a | 466 | * repeatedly until we are sure that every cache has had a chance to |
1da177e4 LT |
467 | * be fully cleaned |
468 | */ | |
469 | void cache_flush(void) | |
470 | { | |
471 | while (cache_clean() != -1) | |
472 | cond_resched(); | |
473 | while (cache_clean() != -1) | |
474 | cond_resched(); | |
475 | } | |
24c3767e | 476 | EXPORT_SYMBOL_GPL(cache_flush); |
1da177e4 LT |
477 | |
478 | void cache_purge(struct cache_detail *detail) | |
479 | { | |
480 | detail->flush_time = LONG_MAX; | |
c5b29f88 | 481 | detail->nextcheck = seconds_since_boot(); |
1da177e4 LT |
482 | cache_flush(); |
483 | detail->flush_time = 1; | |
484 | } | |
24c3767e | 485 | EXPORT_SYMBOL_GPL(cache_purge); |
1da177e4 LT |
486 | |
487 | ||
488 | /* | |
489 | * Deferral and Revisiting of Requests. | |
490 | * | |
491 | * If a cache lookup finds a pending entry, we | |
492 | * need to defer the request and revisit it later. | |
493 | * All deferred requests are stored in a hash table, | |
494 | * indexed by "struct cache_head *". | |
495 | * As it may be wasteful to store a whole request | |
cca5172a | 496 | * structure, we allow the request to provide a |
1da177e4 LT |
497 | * deferred form, which must contain a |
498 | * 'struct cache_deferred_req' | |
499 | * This cache_deferred_req contains a method to allow | |
500 | * it to be revisited when cache info is available | |
501 | */ | |
502 | ||
503 | #define DFR_HASHSIZE (PAGE_SIZE/sizeof(struct list_head)) | |
504 | #define DFR_HASH(item) ((((long)item)>>4 ^ (((long)item)>>13)) % DFR_HASHSIZE) | |
505 | ||
506 | #define DFR_MAX 300 /* ??? */ | |
507 | ||
508 | static DEFINE_SPINLOCK(cache_defer_lock); | |
509 | static LIST_HEAD(cache_defer_list); | |
11174492 | 510 | static struct hlist_head cache_defer_hash[DFR_HASHSIZE]; |
1da177e4 LT |
511 | static int cache_defer_cnt; |
512 | ||
6610f720 BF |
513 | static void __unhash_deferred_req(struct cache_deferred_req *dreq) |
514 | { | |
515 | list_del_init(&dreq->recent); | |
11174492 | 516 | hlist_del_init(&dreq->hash); |
6610f720 BF |
517 | cache_defer_cnt--; |
518 | } | |
519 | ||
520 | static void __hash_deferred_req(struct cache_deferred_req *dreq, struct cache_head *item) | |
521 | { | |
522 | int hash = DFR_HASH(item); | |
523 | ||
524 | list_add(&dreq->recent, &cache_defer_list); | |
11174492 | 525 | hlist_add_head(&dreq->hash, &cache_defer_hash[hash]); |
6610f720 BF |
526 | } |
527 | ||
3211af11 | 528 | static int setup_deferral(struct cache_deferred_req *dreq, struct cache_head *item) |
1da177e4 | 529 | { |
3211af11 | 530 | struct cache_deferred_req *discard; |
1da177e4 LT |
531 | |
532 | dreq->item = item; | |
1da177e4 LT |
533 | |
534 | spin_lock(&cache_defer_lock); | |
535 | ||
6610f720 | 536 | __hash_deferred_req(dreq, item); |
1da177e4 LT |
537 | |
538 | /* it is in, now maybe clean up */ | |
cd68c374 | 539 | discard = NULL; |
1da177e4 | 540 | if (++cache_defer_cnt > DFR_MAX) { |
cd68c374 N |
541 | discard = list_entry(cache_defer_list.prev, |
542 | struct cache_deferred_req, recent); | |
6610f720 | 543 | __unhash_deferred_req(discard); |
1da177e4 LT |
544 | } |
545 | spin_unlock(&cache_defer_lock); | |
546 | ||
cd68c374 | 547 | if (discard) |
1da177e4 | 548 | /* there was one too many */ |
cd68c374 N |
549 | discard->revisit(discard, 1); |
550 | ||
4013edea | 551 | if (!test_bit(CACHE_PENDING, &item->flags)) { |
1da177e4 LT |
552 | /* must have just been validated... */ |
553 | cache_revisit_request(item); | |
9e4c6379 | 554 | return -EAGAIN; |
1da177e4 | 555 | } |
3211af11 BF |
556 | return 0; |
557 | } | |
f16b6e8d | 558 | |
3211af11 BF |
559 | struct thread_deferred_req { |
560 | struct cache_deferred_req handle; | |
561 | struct completion completion; | |
562 | }; | |
563 | ||
564 | static void cache_restart_thread(struct cache_deferred_req *dreq, int too_many) | |
565 | { | |
566 | struct thread_deferred_req *dr = | |
567 | container_of(dreq, struct thread_deferred_req, handle); | |
568 | complete(&dr->completion); | |
569 | } | |
570 | ||
571 | static int cache_wait_req(struct cache_req *req, struct cache_head *item) | |
572 | { | |
573 | struct thread_deferred_req sleeper; | |
574 | struct cache_deferred_req *dreq = &sleeper.handle; | |
575 | int ret; | |
576 | ||
577 | sleeper.completion = COMPLETION_INITIALIZER_ONSTACK(sleeper.completion); | |
578 | dreq->revisit = cache_restart_thread; | |
579 | ||
580 | ret = setup_deferral(dreq, item); | |
3211af11 | 581 | |
277f68db N |
582 | if (ret || |
583 | wait_for_completion_interruptible_timeout( | |
3211af11 BF |
584 | &sleeper.completion, req->thread_wait) <= 0) { |
585 | /* The completion wasn't completed, so we need | |
586 | * to clean up | |
587 | */ | |
588 | spin_lock(&cache_defer_lock); | |
11174492 | 589 | if (!hlist_unhashed(&sleeper.handle.hash)) { |
3211af11 BF |
590 | __unhash_deferred_req(&sleeper.handle); |
591 | spin_unlock(&cache_defer_lock); | |
592 | } else { | |
593 | /* cache_revisit_request already removed | |
594 | * this from the hash table, but hasn't | |
595 | * called ->revisit yet. It will very soon | |
596 | * and we need to wait for it. | |
f16b6e8d | 597 | */ |
3211af11 BF |
598 | spin_unlock(&cache_defer_lock); |
599 | wait_for_completion(&sleeper.completion); | |
f16b6e8d | 600 | } |
3211af11 BF |
601 | } |
602 | if (test_bit(CACHE_PENDING, &item->flags)) { | |
603 | /* item is still pending, try request | |
604 | * deferral | |
f16b6e8d | 605 | */ |
3211af11 | 606 | return -ETIMEDOUT; |
f16b6e8d | 607 | } |
3211af11 BF |
608 | /* only return success if we actually deferred the |
609 | * request. In this case we waited until it was | |
610 | * answered so no deferral has happened - rather | |
611 | * an answer already exists. | |
612 | */ | |
613 | return -EEXIST; | |
614 | } | |
615 | ||
616 | static int cache_defer_req(struct cache_req *req, struct cache_head *item) | |
617 | { | |
618 | struct cache_deferred_req *dreq; | |
619 | int ret; | |
620 | ||
621 | if (cache_defer_cnt >= DFR_MAX) { | |
622 | /* too much in the cache, randomly drop this one, | |
623 | * or continue and drop the oldest | |
624 | */ | |
625 | if (net_random()&1) | |
626 | return -ENOMEM; | |
627 | } | |
628 | if (req->thread_wait) { | |
629 | ret = cache_wait_req(req, item); | |
630 | if (ret != -ETIMEDOUT) | |
631 | return ret; | |
632 | } | |
633 | dreq = req->defer(req); | |
634 | if (dreq == NULL) | |
635 | return -ENOMEM; | |
636 | return setup_deferral(dreq, item); | |
1da177e4 LT |
637 | } |
638 | ||
639 | static void cache_revisit_request(struct cache_head *item) | |
640 | { | |
641 | struct cache_deferred_req *dreq; | |
642 | struct list_head pending; | |
11174492 | 643 | struct hlist_node *lp, *tmp; |
1da177e4 LT |
644 | int hash = DFR_HASH(item); |
645 | ||
646 | INIT_LIST_HEAD(&pending); | |
647 | spin_lock(&cache_defer_lock); | |
cca5172a | 648 | |
11174492 N |
649 | hlist_for_each_entry_safe(dreq, lp, tmp, &cache_defer_hash[hash], hash) |
650 | if (dreq->item == item) { | |
651 | __unhash_deferred_req(dreq); | |
652 | list_add(&dreq->recent, &pending); | |
1da177e4 | 653 | } |
11174492 | 654 | |
1da177e4 LT |
655 | spin_unlock(&cache_defer_lock); |
656 | ||
657 | while (!list_empty(&pending)) { | |
658 | dreq = list_entry(pending.next, struct cache_deferred_req, recent); | |
659 | list_del_init(&dreq->recent); | |
660 | dreq->revisit(dreq, 0); | |
661 | } | |
662 | } | |
663 | ||
664 | void cache_clean_deferred(void *owner) | |
665 | { | |
666 | struct cache_deferred_req *dreq, *tmp; | |
667 | struct list_head pending; | |
668 | ||
669 | ||
670 | INIT_LIST_HEAD(&pending); | |
671 | spin_lock(&cache_defer_lock); | |
cca5172a | 672 | |
1da177e4 | 673 | list_for_each_entry_safe(dreq, tmp, &cache_defer_list, recent) { |
e95dffa4 | 674 | if (dreq->owner == owner) { |
6610f720 | 675 | __unhash_deferred_req(dreq); |
e95dffa4 N |
676 | list_add(&dreq->recent, &pending); |
677 | } | |
1da177e4 LT |
678 | } |
679 | spin_unlock(&cache_defer_lock); | |
680 | ||
681 | while (!list_empty(&pending)) { | |
682 | dreq = list_entry(pending.next, struct cache_deferred_req, recent); | |
683 | list_del_init(&dreq->recent); | |
684 | dreq->revisit(dreq, 1); | |
685 | } | |
686 | } | |
687 | ||
688 | /* | |
689 | * communicate with user-space | |
690 | * | |
a490c681 BF |
691 | * We have a magic /proc file - /proc/sunrpc/<cachename>/channel. |
692 | * On read, you get a full request, or block. | |
693 | * On write, an update request is processed. | |
694 | * Poll works if anything to read, and always allows write. | |
1da177e4 | 695 | * |
cca5172a | 696 | * Implemented by linked list of requests. Each open file has |
a490c681 | 697 | * a ->private that also exists in this list. New requests are added |
1da177e4 LT |
698 | * to the end and may wakeup and preceding readers. |
699 | * New readers are added to the head. If, on read, an item is found with | |
700 | * CACHE_UPCALLING clear, we free it from the list. | |
701 | * | |
702 | */ | |
703 | ||
704 | static DEFINE_SPINLOCK(queue_lock); | |
4a3e2f71 | 705 | static DEFINE_MUTEX(queue_io_mutex); |
1da177e4 LT |
706 | |
707 | struct cache_queue { | |
708 | struct list_head list; | |
709 | int reader; /* if 0, then request */ | |
710 | }; | |
711 | struct cache_request { | |
712 | struct cache_queue q; | |
713 | struct cache_head *item; | |
714 | char * buf; | |
715 | int len; | |
716 | int readers; | |
717 | }; | |
718 | struct cache_reader { | |
719 | struct cache_queue q; | |
720 | int offset; /* if non-0, we have a refcnt on next request */ | |
721 | }; | |
722 | ||
173912a6 TM |
723 | static ssize_t cache_read(struct file *filp, char __user *buf, size_t count, |
724 | loff_t *ppos, struct cache_detail *cd) | |
1da177e4 LT |
725 | { |
726 | struct cache_reader *rp = filp->private_data; | |
727 | struct cache_request *rq; | |
da77005f | 728 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
729 | int err; |
730 | ||
731 | if (count == 0) | |
732 | return 0; | |
733 | ||
da77005f | 734 | mutex_lock(&inode->i_mutex); /* protect against multiple concurrent |
1da177e4 LT |
735 | * readers on this file */ |
736 | again: | |
737 | spin_lock(&queue_lock); | |
738 | /* need to find next request */ | |
739 | while (rp->q.list.next != &cd->queue && | |
740 | list_entry(rp->q.list.next, struct cache_queue, list) | |
741 | ->reader) { | |
742 | struct list_head *next = rp->q.list.next; | |
743 | list_move(&rp->q.list, next); | |
744 | } | |
745 | if (rp->q.list.next == &cd->queue) { | |
746 | spin_unlock(&queue_lock); | |
da77005f | 747 | mutex_unlock(&inode->i_mutex); |
09a62660 | 748 | BUG_ON(rp->offset); |
1da177e4 LT |
749 | return 0; |
750 | } | |
751 | rq = container_of(rp->q.list.next, struct cache_request, q.list); | |
09a62660 | 752 | BUG_ON(rq->q.reader); |
1da177e4 LT |
753 | if (rp->offset == 0) |
754 | rq->readers++; | |
755 | spin_unlock(&queue_lock); | |
756 | ||
757 | if (rp->offset == 0 && !test_bit(CACHE_PENDING, &rq->item->flags)) { | |
758 | err = -EAGAIN; | |
759 | spin_lock(&queue_lock); | |
760 | list_move(&rp->q.list, &rq->q.list); | |
761 | spin_unlock(&queue_lock); | |
762 | } else { | |
763 | if (rp->offset + count > rq->len) | |
764 | count = rq->len - rp->offset; | |
765 | err = -EFAULT; | |
766 | if (copy_to_user(buf, rq->buf + rp->offset, count)) | |
767 | goto out; | |
768 | rp->offset += count; | |
769 | if (rp->offset >= rq->len) { | |
770 | rp->offset = 0; | |
771 | spin_lock(&queue_lock); | |
772 | list_move(&rp->q.list, &rq->q.list); | |
773 | spin_unlock(&queue_lock); | |
774 | } | |
775 | err = 0; | |
776 | } | |
777 | out: | |
778 | if (rp->offset == 0) { | |
779 | /* need to release rq */ | |
780 | spin_lock(&queue_lock); | |
781 | rq->readers--; | |
782 | if (rq->readers == 0 && | |
783 | !test_bit(CACHE_PENDING, &rq->item->flags)) { | |
784 | list_del(&rq->q.list); | |
785 | spin_unlock(&queue_lock); | |
baab935f | 786 | cache_put(rq->item, cd); |
1da177e4 LT |
787 | kfree(rq->buf); |
788 | kfree(rq); | |
789 | } else | |
790 | spin_unlock(&queue_lock); | |
791 | } | |
792 | if (err == -EAGAIN) | |
793 | goto again; | |
da77005f | 794 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
795 | return err ? err : count; |
796 | } | |
797 | ||
da77005f TM |
798 | static ssize_t cache_do_downcall(char *kaddr, const char __user *buf, |
799 | size_t count, struct cache_detail *cd) | |
800 | { | |
801 | ssize_t ret; | |
1da177e4 | 802 | |
da77005f TM |
803 | if (copy_from_user(kaddr, buf, count)) |
804 | return -EFAULT; | |
805 | kaddr[count] = '\0'; | |
806 | ret = cd->cache_parse(cd, kaddr, count); | |
807 | if (!ret) | |
808 | ret = count; | |
809 | return ret; | |
810 | } | |
811 | ||
812 | static ssize_t cache_slow_downcall(const char __user *buf, | |
813 | size_t count, struct cache_detail *cd) | |
1da177e4 | 814 | { |
da77005f TM |
815 | static char write_buf[8192]; /* protected by queue_io_mutex */ |
816 | ssize_t ret = -EINVAL; | |
1da177e4 | 817 | |
1da177e4 | 818 | if (count >= sizeof(write_buf)) |
da77005f | 819 | goto out; |
4a3e2f71 | 820 | mutex_lock(&queue_io_mutex); |
da77005f TM |
821 | ret = cache_do_downcall(write_buf, buf, count, cd); |
822 | mutex_unlock(&queue_io_mutex); | |
823 | out: | |
824 | return ret; | |
825 | } | |
1da177e4 | 826 | |
da77005f TM |
827 | static ssize_t cache_downcall(struct address_space *mapping, |
828 | const char __user *buf, | |
829 | size_t count, struct cache_detail *cd) | |
830 | { | |
831 | struct page *page; | |
832 | char *kaddr; | |
833 | ssize_t ret = -ENOMEM; | |
834 | ||
835 | if (count >= PAGE_CACHE_SIZE) | |
836 | goto out_slow; | |
837 | ||
838 | page = find_or_create_page(mapping, 0, GFP_KERNEL); | |
839 | if (!page) | |
840 | goto out_slow; | |
841 | ||
842 | kaddr = kmap(page); | |
843 | ret = cache_do_downcall(kaddr, buf, count, cd); | |
844 | kunmap(page); | |
845 | unlock_page(page); | |
846 | page_cache_release(page); | |
847 | return ret; | |
848 | out_slow: | |
849 | return cache_slow_downcall(buf, count, cd); | |
850 | } | |
1da177e4 | 851 | |
173912a6 TM |
852 | static ssize_t cache_write(struct file *filp, const char __user *buf, |
853 | size_t count, loff_t *ppos, | |
854 | struct cache_detail *cd) | |
da77005f TM |
855 | { |
856 | struct address_space *mapping = filp->f_mapping; | |
857 | struct inode *inode = filp->f_path.dentry->d_inode; | |
da77005f TM |
858 | ssize_t ret = -EINVAL; |
859 | ||
860 | if (!cd->cache_parse) | |
861 | goto out; | |
862 | ||
863 | mutex_lock(&inode->i_mutex); | |
864 | ret = cache_downcall(mapping, buf, count, cd); | |
865 | mutex_unlock(&inode->i_mutex); | |
866 | out: | |
867 | return ret; | |
1da177e4 LT |
868 | } |
869 | ||
870 | static DECLARE_WAIT_QUEUE_HEAD(queue_wait); | |
871 | ||
173912a6 TM |
872 | static unsigned int cache_poll(struct file *filp, poll_table *wait, |
873 | struct cache_detail *cd) | |
1da177e4 LT |
874 | { |
875 | unsigned int mask; | |
876 | struct cache_reader *rp = filp->private_data; | |
877 | struct cache_queue *cq; | |
1da177e4 LT |
878 | |
879 | poll_wait(filp, &queue_wait, wait); | |
880 | ||
881 | /* alway allow write */ | |
882 | mask = POLL_OUT | POLLWRNORM; | |
883 | ||
884 | if (!rp) | |
885 | return mask; | |
886 | ||
887 | spin_lock(&queue_lock); | |
888 | ||
889 | for (cq= &rp->q; &cq->list != &cd->queue; | |
890 | cq = list_entry(cq->list.next, struct cache_queue, list)) | |
891 | if (!cq->reader) { | |
892 | mask |= POLLIN | POLLRDNORM; | |
893 | break; | |
894 | } | |
895 | spin_unlock(&queue_lock); | |
896 | return mask; | |
897 | } | |
898 | ||
173912a6 TM |
899 | static int cache_ioctl(struct inode *ino, struct file *filp, |
900 | unsigned int cmd, unsigned long arg, | |
901 | struct cache_detail *cd) | |
1da177e4 LT |
902 | { |
903 | int len = 0; | |
904 | struct cache_reader *rp = filp->private_data; | |
905 | struct cache_queue *cq; | |
1da177e4 LT |
906 | |
907 | if (cmd != FIONREAD || !rp) | |
908 | return -EINVAL; | |
909 | ||
910 | spin_lock(&queue_lock); | |
911 | ||
912 | /* only find the length remaining in current request, | |
913 | * or the length of the next request | |
914 | */ | |
915 | for (cq= &rp->q; &cq->list != &cd->queue; | |
916 | cq = list_entry(cq->list.next, struct cache_queue, list)) | |
917 | if (!cq->reader) { | |
918 | struct cache_request *cr = | |
919 | container_of(cq, struct cache_request, q); | |
920 | len = cr->len - rp->offset; | |
921 | break; | |
922 | } | |
923 | spin_unlock(&queue_lock); | |
924 | ||
925 | return put_user(len, (int __user *)arg); | |
926 | } | |
927 | ||
173912a6 TM |
928 | static int cache_open(struct inode *inode, struct file *filp, |
929 | struct cache_detail *cd) | |
1da177e4 LT |
930 | { |
931 | struct cache_reader *rp = NULL; | |
932 | ||
f7e86ab9 TM |
933 | if (!cd || !try_module_get(cd->owner)) |
934 | return -EACCES; | |
1da177e4 LT |
935 | nonseekable_open(inode, filp); |
936 | if (filp->f_mode & FMODE_READ) { | |
1da177e4 LT |
937 | rp = kmalloc(sizeof(*rp), GFP_KERNEL); |
938 | if (!rp) | |
939 | return -ENOMEM; | |
940 | rp->offset = 0; | |
941 | rp->q.reader = 1; | |
942 | atomic_inc(&cd->readers); | |
943 | spin_lock(&queue_lock); | |
944 | list_add(&rp->q.list, &cd->queue); | |
945 | spin_unlock(&queue_lock); | |
946 | } | |
947 | filp->private_data = rp; | |
948 | return 0; | |
949 | } | |
950 | ||
173912a6 TM |
951 | static int cache_release(struct inode *inode, struct file *filp, |
952 | struct cache_detail *cd) | |
1da177e4 LT |
953 | { |
954 | struct cache_reader *rp = filp->private_data; | |
1da177e4 LT |
955 | |
956 | if (rp) { | |
957 | spin_lock(&queue_lock); | |
958 | if (rp->offset) { | |
959 | struct cache_queue *cq; | |
960 | for (cq= &rp->q; &cq->list != &cd->queue; | |
961 | cq = list_entry(cq->list.next, struct cache_queue, list)) | |
962 | if (!cq->reader) { | |
963 | container_of(cq, struct cache_request, q) | |
964 | ->readers--; | |
965 | break; | |
966 | } | |
967 | rp->offset = 0; | |
968 | } | |
969 | list_del(&rp->q.list); | |
970 | spin_unlock(&queue_lock); | |
971 | ||
972 | filp->private_data = NULL; | |
973 | kfree(rp); | |
974 | ||
c5b29f88 | 975 | cd->last_close = seconds_since_boot(); |
1da177e4 LT |
976 | atomic_dec(&cd->readers); |
977 | } | |
f7e86ab9 | 978 | module_put(cd->owner); |
1da177e4 LT |
979 | return 0; |
980 | } | |
981 | ||
982 | ||
983 | ||
f866a819 | 984 | static void cache_dequeue(struct cache_detail *detail, struct cache_head *ch) |
1da177e4 LT |
985 | { |
986 | struct cache_queue *cq; | |
987 | spin_lock(&queue_lock); | |
988 | list_for_each_entry(cq, &detail->queue, list) | |
989 | if (!cq->reader) { | |
990 | struct cache_request *cr = container_of(cq, struct cache_request, q); | |
991 | if (cr->item != ch) | |
992 | continue; | |
993 | if (cr->readers != 0) | |
4013edea | 994 | continue; |
1da177e4 LT |
995 | list_del(&cr->q.list); |
996 | spin_unlock(&queue_lock); | |
baab935f | 997 | cache_put(cr->item, detail); |
1da177e4 LT |
998 | kfree(cr->buf); |
999 | kfree(cr); | |
1000 | return; | |
1001 | } | |
1002 | spin_unlock(&queue_lock); | |
1003 | } | |
1004 | ||
1005 | /* | |
1006 | * Support routines for text-based upcalls. | |
1007 | * Fields are separated by spaces. | |
1008 | * Fields are either mangled to quote space tab newline slosh with slosh | |
1009 | * or a hexified with a leading \x | |
1010 | * Record is terminated with newline. | |
1011 | * | |
1012 | */ | |
1013 | ||
1014 | void qword_add(char **bpp, int *lp, char *str) | |
1015 | { | |
1016 | char *bp = *bpp; | |
1017 | int len = *lp; | |
1018 | char c; | |
1019 | ||
1020 | if (len < 0) return; | |
1021 | ||
1022 | while ((c=*str++) && len) | |
1023 | switch(c) { | |
1024 | case ' ': | |
1025 | case '\t': | |
1026 | case '\n': | |
1027 | case '\\': | |
1028 | if (len >= 4) { | |
1029 | *bp++ = '\\'; | |
1030 | *bp++ = '0' + ((c & 0300)>>6); | |
1031 | *bp++ = '0' + ((c & 0070)>>3); | |
1032 | *bp++ = '0' + ((c & 0007)>>0); | |
1033 | } | |
1034 | len -= 4; | |
1035 | break; | |
1036 | default: | |
1037 | *bp++ = c; | |
1038 | len--; | |
1039 | } | |
1040 | if (c || len <1) len = -1; | |
1041 | else { | |
1042 | *bp++ = ' '; | |
1043 | len--; | |
1044 | } | |
1045 | *bpp = bp; | |
1046 | *lp = len; | |
1047 | } | |
24c3767e | 1048 | EXPORT_SYMBOL_GPL(qword_add); |
1da177e4 LT |
1049 | |
1050 | void qword_addhex(char **bpp, int *lp, char *buf, int blen) | |
1051 | { | |
1052 | char *bp = *bpp; | |
1053 | int len = *lp; | |
1054 | ||
1055 | if (len < 0) return; | |
1056 | ||
1057 | if (len > 2) { | |
1058 | *bp++ = '\\'; | |
1059 | *bp++ = 'x'; | |
1060 | len -= 2; | |
1061 | while (blen && len >= 2) { | |
1062 | unsigned char c = *buf++; | |
1063 | *bp++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1); | |
1064 | *bp++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1); | |
1065 | len -= 2; | |
1066 | blen--; | |
1067 | } | |
1068 | } | |
1069 | if (blen || len<1) len = -1; | |
1070 | else { | |
1071 | *bp++ = ' '; | |
1072 | len--; | |
1073 | } | |
1074 | *bpp = bp; | |
1075 | *lp = len; | |
1076 | } | |
24c3767e | 1077 | EXPORT_SYMBOL_GPL(qword_addhex); |
1da177e4 LT |
1078 | |
1079 | static void warn_no_listener(struct cache_detail *detail) | |
1080 | { | |
1081 | if (detail->last_warn != detail->last_close) { | |
1082 | detail->last_warn = detail->last_close; | |
1083 | if (detail->warn_no_listener) | |
2da8ca26 | 1084 | detail->warn_no_listener(detail, detail->last_close != 0); |
1da177e4 LT |
1085 | } |
1086 | } | |
1087 | ||
06497524 BF |
1088 | static bool cache_listeners_exist(struct cache_detail *detail) |
1089 | { | |
1090 | if (atomic_read(&detail->readers)) | |
1091 | return true; | |
1092 | if (detail->last_close == 0) | |
1093 | /* This cache was never opened */ | |
1094 | return false; | |
1095 | if (detail->last_close < seconds_since_boot() - 30) | |
1096 | /* | |
1097 | * We allow for the possibility that someone might | |
1098 | * restart a userspace daemon without restarting the | |
1099 | * server; but after 30 seconds, we give up. | |
1100 | */ | |
1101 | return false; | |
1102 | return true; | |
1103 | } | |
1104 | ||
1da177e4 | 1105 | /* |
bc74b4f5 TM |
1106 | * register an upcall request to user-space and queue it up for read() by the |
1107 | * upcall daemon. | |
1108 | * | |
1da177e4 LT |
1109 | * Each request is at most one page long. |
1110 | */ | |
bc74b4f5 TM |
1111 | int sunrpc_cache_pipe_upcall(struct cache_detail *detail, struct cache_head *h, |
1112 | void (*cache_request)(struct cache_detail *, | |
1113 | struct cache_head *, | |
1114 | char **, | |
1115 | int *)) | |
1da177e4 LT |
1116 | { |
1117 | ||
1118 | char *buf; | |
1119 | struct cache_request *crq; | |
1120 | char *bp; | |
1121 | int len; | |
1122 | ||
06497524 BF |
1123 | if (!cache_listeners_exist(detail)) { |
1124 | warn_no_listener(detail); | |
1125 | return -EINVAL; | |
1da177e4 LT |
1126 | } |
1127 | ||
1128 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
1129 | if (!buf) | |
1130 | return -EAGAIN; | |
1131 | ||
1132 | crq = kmalloc(sizeof (*crq), GFP_KERNEL); | |
1133 | if (!crq) { | |
1134 | kfree(buf); | |
1135 | return -EAGAIN; | |
1136 | } | |
1137 | ||
1138 | bp = buf; len = PAGE_SIZE; | |
1139 | ||
bc74b4f5 | 1140 | cache_request(detail, h, &bp, &len); |
1da177e4 LT |
1141 | |
1142 | if (len < 0) { | |
1143 | kfree(buf); | |
1144 | kfree(crq); | |
1145 | return -EAGAIN; | |
1146 | } | |
1147 | crq->q.reader = 0; | |
1148 | crq->item = cache_get(h); | |
1149 | crq->buf = buf; | |
1150 | crq->len = PAGE_SIZE - len; | |
1151 | crq->readers = 0; | |
1152 | spin_lock(&queue_lock); | |
1153 | list_add_tail(&crq->q.list, &detail->queue); | |
1154 | spin_unlock(&queue_lock); | |
1155 | wake_up(&queue_wait); | |
1156 | return 0; | |
1157 | } | |
bc74b4f5 | 1158 | EXPORT_SYMBOL_GPL(sunrpc_cache_pipe_upcall); |
1da177e4 LT |
1159 | |
1160 | /* | |
1161 | * parse a message from user-space and pass it | |
1162 | * to an appropriate cache | |
1163 | * Messages are, like requests, separated into fields by | |
1164 | * spaces and dequotes as \xHEXSTRING or embedded \nnn octal | |
1165 | * | |
cca5172a | 1166 | * Message is |
1da177e4 LT |
1167 | * reply cachename expiry key ... content.... |
1168 | * | |
cca5172a | 1169 | * key and content are both parsed by cache |
1da177e4 LT |
1170 | */ |
1171 | ||
1172 | #define isodigit(c) (isdigit(c) && c <= '7') | |
1173 | int qword_get(char **bpp, char *dest, int bufsize) | |
1174 | { | |
1175 | /* return bytes copied, or -1 on error */ | |
1176 | char *bp = *bpp; | |
1177 | int len = 0; | |
1178 | ||
1179 | while (*bp == ' ') bp++; | |
1180 | ||
1181 | if (bp[0] == '\\' && bp[1] == 'x') { | |
1182 | /* HEX STRING */ | |
1183 | bp += 2; | |
e7f483ea AS |
1184 | while (len < bufsize) { |
1185 | int h, l; | |
1186 | ||
1187 | h = hex_to_bin(bp[0]); | |
1188 | if (h < 0) | |
1189 | break; | |
1190 | ||
1191 | l = hex_to_bin(bp[1]); | |
1192 | if (l < 0) | |
1193 | break; | |
1194 | ||
1195 | *dest++ = (h << 4) | l; | |
1196 | bp += 2; | |
1da177e4 LT |
1197 | len++; |
1198 | } | |
1199 | } else { | |
1200 | /* text with \nnn octal quoting */ | |
1201 | while (*bp != ' ' && *bp != '\n' && *bp && len < bufsize-1) { | |
1202 | if (*bp == '\\' && | |
1203 | isodigit(bp[1]) && (bp[1] <= '3') && | |
1204 | isodigit(bp[2]) && | |
1205 | isodigit(bp[3])) { | |
1206 | int byte = (*++bp -'0'); | |
1207 | bp++; | |
1208 | byte = (byte << 3) | (*bp++ - '0'); | |
1209 | byte = (byte << 3) | (*bp++ - '0'); | |
1210 | *dest++ = byte; | |
1211 | len++; | |
1212 | } else { | |
1213 | *dest++ = *bp++; | |
1214 | len++; | |
1215 | } | |
1216 | } | |
1217 | } | |
1218 | ||
1219 | if (*bp != ' ' && *bp != '\n' && *bp != '\0') | |
1220 | return -1; | |
1221 | while (*bp == ' ') bp++; | |
1222 | *bpp = bp; | |
1223 | *dest = '\0'; | |
1224 | return len; | |
1225 | } | |
24c3767e | 1226 | EXPORT_SYMBOL_GPL(qword_get); |
1da177e4 LT |
1227 | |
1228 | ||
1229 | /* | |
1230 | * support /proc/sunrpc/cache/$CACHENAME/content | |
1231 | * as a seqfile. | |
1232 | * We call ->cache_show passing NULL for the item to | |
1233 | * get a header, then pass each real item in the cache | |
1234 | */ | |
1235 | ||
1236 | struct handle { | |
1237 | struct cache_detail *cd; | |
1238 | }; | |
1239 | ||
1240 | static void *c_start(struct seq_file *m, loff_t *pos) | |
9a429c49 | 1241 | __acquires(cd->hash_lock) |
1da177e4 LT |
1242 | { |
1243 | loff_t n = *pos; | |
1244 | unsigned hash, entry; | |
1245 | struct cache_head *ch; | |
1246 | struct cache_detail *cd = ((struct handle*)m->private)->cd; | |
cca5172a | 1247 | |
1da177e4 LT |
1248 | |
1249 | read_lock(&cd->hash_lock); | |
1250 | if (!n--) | |
1251 | return SEQ_START_TOKEN; | |
1252 | hash = n >> 32; | |
1253 | entry = n & ((1LL<<32) - 1); | |
1254 | ||
1255 | for (ch=cd->hash_table[hash]; ch; ch=ch->next) | |
1256 | if (!entry--) | |
1257 | return ch; | |
1258 | n &= ~((1LL<<32) - 1); | |
1259 | do { | |
1260 | hash++; | |
1261 | n += 1LL<<32; | |
cca5172a | 1262 | } while(hash < cd->hash_size && |
1da177e4 LT |
1263 | cd->hash_table[hash]==NULL); |
1264 | if (hash >= cd->hash_size) | |
1265 | return NULL; | |
1266 | *pos = n+1; | |
1267 | return cd->hash_table[hash]; | |
1268 | } | |
1269 | ||
1270 | static void *c_next(struct seq_file *m, void *p, loff_t *pos) | |
1271 | { | |
1272 | struct cache_head *ch = p; | |
1273 | int hash = (*pos >> 32); | |
1274 | struct cache_detail *cd = ((struct handle*)m->private)->cd; | |
1275 | ||
1276 | if (p == SEQ_START_TOKEN) | |
1277 | hash = 0; | |
1278 | else if (ch->next == NULL) { | |
1279 | hash++; | |
1280 | *pos += 1LL<<32; | |
1281 | } else { | |
1282 | ++*pos; | |
1283 | return ch->next; | |
1284 | } | |
1285 | *pos &= ~((1LL<<32) - 1); | |
1286 | while (hash < cd->hash_size && | |
1287 | cd->hash_table[hash] == NULL) { | |
1288 | hash++; | |
1289 | *pos += 1LL<<32; | |
1290 | } | |
1291 | if (hash >= cd->hash_size) | |
1292 | return NULL; | |
1293 | ++*pos; | |
1294 | return cd->hash_table[hash]; | |
1295 | } | |
1296 | ||
1297 | static void c_stop(struct seq_file *m, void *p) | |
9a429c49 | 1298 | __releases(cd->hash_lock) |
1da177e4 LT |
1299 | { |
1300 | struct cache_detail *cd = ((struct handle*)m->private)->cd; | |
1301 | read_unlock(&cd->hash_lock); | |
1302 | } | |
1303 | ||
1304 | static int c_show(struct seq_file *m, void *p) | |
1305 | { | |
1306 | struct cache_head *cp = p; | |
1307 | struct cache_detail *cd = ((struct handle*)m->private)->cd; | |
1308 | ||
1309 | if (p == SEQ_START_TOKEN) | |
1310 | return cd->cache_show(m, cd, NULL); | |
1311 | ||
1312 | ifdebug(CACHE) | |
4013edea | 1313 | seq_printf(m, "# expiry=%ld refcnt=%d flags=%lx\n", |
c5b29f88 N |
1314 | convert_to_wallclock(cp->expiry_time), |
1315 | atomic_read(&cp->ref.refcount), cp->flags); | |
1da177e4 LT |
1316 | cache_get(cp); |
1317 | if (cache_check(cd, cp, NULL)) | |
1318 | /* cache_check does a cache_put on failure */ | |
1319 | seq_printf(m, "# "); | |
1320 | else | |
1321 | cache_put(cp, cd); | |
1322 | ||
1323 | return cd->cache_show(m, cd, cp); | |
1324 | } | |
1325 | ||
56b3d975 | 1326 | static const struct seq_operations cache_content_op = { |
1da177e4 LT |
1327 | .start = c_start, |
1328 | .next = c_next, | |
1329 | .stop = c_stop, | |
1330 | .show = c_show, | |
1331 | }; | |
1332 | ||
173912a6 TM |
1333 | static int content_open(struct inode *inode, struct file *file, |
1334 | struct cache_detail *cd) | |
1da177e4 | 1335 | { |
1da177e4 | 1336 | struct handle *han; |
1da177e4 | 1337 | |
f7e86ab9 TM |
1338 | if (!cd || !try_module_get(cd->owner)) |
1339 | return -EACCES; | |
ec931035 | 1340 | han = __seq_open_private(file, &cache_content_op, sizeof(*han)); |
a5990ea1 LZ |
1341 | if (han == NULL) { |
1342 | module_put(cd->owner); | |
1da177e4 | 1343 | return -ENOMEM; |
a5990ea1 | 1344 | } |
1da177e4 LT |
1345 | |
1346 | han->cd = cd; | |
ec931035 | 1347 | return 0; |
1da177e4 | 1348 | } |
1da177e4 | 1349 | |
f7e86ab9 TM |
1350 | static int content_release(struct inode *inode, struct file *file, |
1351 | struct cache_detail *cd) | |
1352 | { | |
1353 | int ret = seq_release_private(inode, file); | |
1354 | module_put(cd->owner); | |
1355 | return ret; | |
1356 | } | |
1357 | ||
1358 | static int open_flush(struct inode *inode, struct file *file, | |
1359 | struct cache_detail *cd) | |
1360 | { | |
1361 | if (!cd || !try_module_get(cd->owner)) | |
1362 | return -EACCES; | |
1363 | return nonseekable_open(inode, file); | |
1364 | } | |
1365 | ||
1366 | static int release_flush(struct inode *inode, struct file *file, | |
1367 | struct cache_detail *cd) | |
1368 | { | |
1369 | module_put(cd->owner); | |
1370 | return 0; | |
1371 | } | |
1da177e4 LT |
1372 | |
1373 | static ssize_t read_flush(struct file *file, char __user *buf, | |
173912a6 TM |
1374 | size_t count, loff_t *ppos, |
1375 | struct cache_detail *cd) | |
1da177e4 | 1376 | { |
1da177e4 LT |
1377 | char tbuf[20]; |
1378 | unsigned long p = *ppos; | |
01b2969a | 1379 | size_t len; |
1da177e4 | 1380 | |
c5b29f88 | 1381 | sprintf(tbuf, "%lu\n", convert_to_wallclock(cd->flush_time)); |
1da177e4 LT |
1382 | len = strlen(tbuf); |
1383 | if (p >= len) | |
1384 | return 0; | |
1385 | len -= p; | |
01b2969a CL |
1386 | if (len > count) |
1387 | len = count; | |
1da177e4 | 1388 | if (copy_to_user(buf, (void*)(tbuf+p), len)) |
01b2969a CL |
1389 | return -EFAULT; |
1390 | *ppos += len; | |
1da177e4 LT |
1391 | return len; |
1392 | } | |
1393 | ||
173912a6 TM |
1394 | static ssize_t write_flush(struct file *file, const char __user *buf, |
1395 | size_t count, loff_t *ppos, | |
1396 | struct cache_detail *cd) | |
1da177e4 | 1397 | { |
1da177e4 | 1398 | char tbuf[20]; |
c5b29f88 N |
1399 | char *bp, *ep; |
1400 | ||
1da177e4 LT |
1401 | if (*ppos || count > sizeof(tbuf)-1) |
1402 | return -EINVAL; | |
1403 | if (copy_from_user(tbuf, buf, count)) | |
1404 | return -EFAULT; | |
1405 | tbuf[count] = 0; | |
c5b29f88 | 1406 | simple_strtoul(tbuf, &ep, 0); |
1da177e4 LT |
1407 | if (*ep && *ep != '\n') |
1408 | return -EINVAL; | |
1409 | ||
c5b29f88 N |
1410 | bp = tbuf; |
1411 | cd->flush_time = get_expiry(&bp); | |
1412 | cd->nextcheck = seconds_since_boot(); | |
1da177e4 LT |
1413 | cache_flush(); |
1414 | ||
1415 | *ppos += count; | |
1416 | return count; | |
1417 | } | |
1418 | ||
173912a6 TM |
1419 | static ssize_t cache_read_procfs(struct file *filp, char __user *buf, |
1420 | size_t count, loff_t *ppos) | |
1421 | { | |
1422 | struct cache_detail *cd = PDE(filp->f_path.dentry->d_inode)->data; | |
1423 | ||
1424 | return cache_read(filp, buf, count, ppos, cd); | |
1425 | } | |
1426 | ||
1427 | static ssize_t cache_write_procfs(struct file *filp, const char __user *buf, | |
1428 | size_t count, loff_t *ppos) | |
1429 | { | |
1430 | struct cache_detail *cd = PDE(filp->f_path.dentry->d_inode)->data; | |
1431 | ||
1432 | return cache_write(filp, buf, count, ppos, cd); | |
1433 | } | |
1434 | ||
1435 | static unsigned int cache_poll_procfs(struct file *filp, poll_table *wait) | |
1436 | { | |
1437 | struct cache_detail *cd = PDE(filp->f_path.dentry->d_inode)->data; | |
1438 | ||
1439 | return cache_poll(filp, wait, cd); | |
1440 | } | |
1441 | ||
d79b6f4d FW |
1442 | static long cache_ioctl_procfs(struct file *filp, |
1443 | unsigned int cmd, unsigned long arg) | |
173912a6 | 1444 | { |
d79b6f4d FW |
1445 | long ret; |
1446 | struct inode *inode = filp->f_path.dentry->d_inode; | |
173912a6 TM |
1447 | struct cache_detail *cd = PDE(inode)->data; |
1448 | ||
d79b6f4d FW |
1449 | lock_kernel(); |
1450 | ret = cache_ioctl(inode, filp, cmd, arg, cd); | |
1451 | unlock_kernel(); | |
1452 | ||
1453 | return ret; | |
173912a6 TM |
1454 | } |
1455 | ||
1456 | static int cache_open_procfs(struct inode *inode, struct file *filp) | |
1457 | { | |
1458 | struct cache_detail *cd = PDE(inode)->data; | |
1459 | ||
1460 | return cache_open(inode, filp, cd); | |
1461 | } | |
1462 | ||
1463 | static int cache_release_procfs(struct inode *inode, struct file *filp) | |
1464 | { | |
1465 | struct cache_detail *cd = PDE(inode)->data; | |
1466 | ||
1467 | return cache_release(inode, filp, cd); | |
1468 | } | |
1469 | ||
1470 | static const struct file_operations cache_file_operations_procfs = { | |
1471 | .owner = THIS_MODULE, | |
1472 | .llseek = no_llseek, | |
1473 | .read = cache_read_procfs, | |
1474 | .write = cache_write_procfs, | |
1475 | .poll = cache_poll_procfs, | |
d79b6f4d | 1476 | .unlocked_ioctl = cache_ioctl_procfs, /* for FIONREAD */ |
173912a6 TM |
1477 | .open = cache_open_procfs, |
1478 | .release = cache_release_procfs, | |
1da177e4 | 1479 | }; |
173912a6 TM |
1480 | |
1481 | static int content_open_procfs(struct inode *inode, struct file *filp) | |
1482 | { | |
1483 | struct cache_detail *cd = PDE(inode)->data; | |
1484 | ||
1485 | return content_open(inode, filp, cd); | |
1486 | } | |
1487 | ||
f7e86ab9 TM |
1488 | static int content_release_procfs(struct inode *inode, struct file *filp) |
1489 | { | |
1490 | struct cache_detail *cd = PDE(inode)->data; | |
1491 | ||
1492 | return content_release(inode, filp, cd); | |
1493 | } | |
1494 | ||
173912a6 TM |
1495 | static const struct file_operations content_file_operations_procfs = { |
1496 | .open = content_open_procfs, | |
1497 | .read = seq_read, | |
1498 | .llseek = seq_lseek, | |
f7e86ab9 | 1499 | .release = content_release_procfs, |
173912a6 TM |
1500 | }; |
1501 | ||
f7e86ab9 TM |
1502 | static int open_flush_procfs(struct inode *inode, struct file *filp) |
1503 | { | |
1504 | struct cache_detail *cd = PDE(inode)->data; | |
1505 | ||
1506 | return open_flush(inode, filp, cd); | |
1507 | } | |
1508 | ||
1509 | static int release_flush_procfs(struct inode *inode, struct file *filp) | |
1510 | { | |
1511 | struct cache_detail *cd = PDE(inode)->data; | |
1512 | ||
1513 | return release_flush(inode, filp, cd); | |
1514 | } | |
1515 | ||
173912a6 TM |
1516 | static ssize_t read_flush_procfs(struct file *filp, char __user *buf, |
1517 | size_t count, loff_t *ppos) | |
1518 | { | |
1519 | struct cache_detail *cd = PDE(filp->f_path.dentry->d_inode)->data; | |
1520 | ||
1521 | return read_flush(filp, buf, count, ppos, cd); | |
1522 | } | |
1523 | ||
1524 | static ssize_t write_flush_procfs(struct file *filp, | |
1525 | const char __user *buf, | |
1526 | size_t count, loff_t *ppos) | |
1527 | { | |
1528 | struct cache_detail *cd = PDE(filp->f_path.dentry->d_inode)->data; | |
1529 | ||
1530 | return write_flush(filp, buf, count, ppos, cd); | |
1531 | } | |
1532 | ||
1533 | static const struct file_operations cache_flush_operations_procfs = { | |
f7e86ab9 | 1534 | .open = open_flush_procfs, |
173912a6 TM |
1535 | .read = read_flush_procfs, |
1536 | .write = write_flush_procfs, | |
f7e86ab9 | 1537 | .release = release_flush_procfs, |
1da177e4 | 1538 | }; |
173912a6 | 1539 | |
593ce16b | 1540 | static void remove_cache_proc_entries(struct cache_detail *cd, struct net *net) |
173912a6 | 1541 | { |
4f42d0d5 PE |
1542 | struct sunrpc_net *sn; |
1543 | ||
173912a6 TM |
1544 | if (cd->u.procfs.proc_ent == NULL) |
1545 | return; | |
1546 | if (cd->u.procfs.flush_ent) | |
1547 | remove_proc_entry("flush", cd->u.procfs.proc_ent); | |
1548 | if (cd->u.procfs.channel_ent) | |
1549 | remove_proc_entry("channel", cd->u.procfs.proc_ent); | |
1550 | if (cd->u.procfs.content_ent) | |
1551 | remove_proc_entry("content", cd->u.procfs.proc_ent); | |
1552 | cd->u.procfs.proc_ent = NULL; | |
4f42d0d5 PE |
1553 | sn = net_generic(net, sunrpc_net_id); |
1554 | remove_proc_entry(cd->name, sn->proc_net_rpc); | |
173912a6 TM |
1555 | } |
1556 | ||
1557 | #ifdef CONFIG_PROC_FS | |
593ce16b | 1558 | static int create_cache_proc_entries(struct cache_detail *cd, struct net *net) |
173912a6 TM |
1559 | { |
1560 | struct proc_dir_entry *p; | |
4f42d0d5 | 1561 | struct sunrpc_net *sn; |
173912a6 | 1562 | |
4f42d0d5 PE |
1563 | sn = net_generic(net, sunrpc_net_id); |
1564 | cd->u.procfs.proc_ent = proc_mkdir(cd->name, sn->proc_net_rpc); | |
173912a6 TM |
1565 | if (cd->u.procfs.proc_ent == NULL) |
1566 | goto out_nomem; | |
1567 | cd->u.procfs.channel_ent = NULL; | |
1568 | cd->u.procfs.content_ent = NULL; | |
1569 | ||
1570 | p = proc_create_data("flush", S_IFREG|S_IRUSR|S_IWUSR, | |
1571 | cd->u.procfs.proc_ent, | |
1572 | &cache_flush_operations_procfs, cd); | |
1573 | cd->u.procfs.flush_ent = p; | |
1574 | if (p == NULL) | |
1575 | goto out_nomem; | |
1576 | ||
1577 | if (cd->cache_upcall || cd->cache_parse) { | |
1578 | p = proc_create_data("channel", S_IFREG|S_IRUSR|S_IWUSR, | |
1579 | cd->u.procfs.proc_ent, | |
1580 | &cache_file_operations_procfs, cd); | |
1581 | cd->u.procfs.channel_ent = p; | |
1582 | if (p == NULL) | |
1583 | goto out_nomem; | |
1584 | } | |
1585 | if (cd->cache_show) { | |
1586 | p = proc_create_data("content", S_IFREG|S_IRUSR|S_IWUSR, | |
1587 | cd->u.procfs.proc_ent, | |
1588 | &content_file_operations_procfs, cd); | |
1589 | cd->u.procfs.content_ent = p; | |
1590 | if (p == NULL) | |
1591 | goto out_nomem; | |
1592 | } | |
1593 | return 0; | |
1594 | out_nomem: | |
593ce16b | 1595 | remove_cache_proc_entries(cd, net); |
173912a6 TM |
1596 | return -ENOMEM; |
1597 | } | |
1598 | #else /* CONFIG_PROC_FS */ | |
593ce16b | 1599 | static int create_cache_proc_entries(struct cache_detail *cd, struct net *net) |
173912a6 TM |
1600 | { |
1601 | return 0; | |
1602 | } | |
1603 | #endif | |
1604 | ||
8eab945c AB |
1605 | void __init cache_initialize(void) |
1606 | { | |
1607 | INIT_DELAYED_WORK_DEFERRABLE(&cache_cleaner, do_cache_clean); | |
1608 | } | |
1609 | ||
593ce16b | 1610 | int cache_register_net(struct cache_detail *cd, struct net *net) |
173912a6 TM |
1611 | { |
1612 | int ret; | |
1613 | ||
1614 | sunrpc_init_cache_detail(cd); | |
593ce16b | 1615 | ret = create_cache_proc_entries(cd, net); |
173912a6 TM |
1616 | if (ret) |
1617 | sunrpc_destroy_cache_detail(cd); | |
1618 | return ret; | |
1619 | } | |
593ce16b PE |
1620 | |
1621 | int cache_register(struct cache_detail *cd) | |
1622 | { | |
1623 | return cache_register_net(cd, &init_net); | |
1624 | } | |
173912a6 TM |
1625 | EXPORT_SYMBOL_GPL(cache_register); |
1626 | ||
593ce16b | 1627 | void cache_unregister_net(struct cache_detail *cd, struct net *net) |
173912a6 | 1628 | { |
593ce16b | 1629 | remove_cache_proc_entries(cd, net); |
173912a6 TM |
1630 | sunrpc_destroy_cache_detail(cd); |
1631 | } | |
593ce16b PE |
1632 | |
1633 | void cache_unregister(struct cache_detail *cd) | |
1634 | { | |
1635 | cache_unregister_net(cd, &init_net); | |
1636 | } | |
173912a6 | 1637 | EXPORT_SYMBOL_GPL(cache_unregister); |
8854e82d TM |
1638 | |
1639 | static ssize_t cache_read_pipefs(struct file *filp, char __user *buf, | |
1640 | size_t count, loff_t *ppos) | |
1641 | { | |
1642 | struct cache_detail *cd = RPC_I(filp->f_path.dentry->d_inode)->private; | |
1643 | ||
1644 | return cache_read(filp, buf, count, ppos, cd); | |
1645 | } | |
1646 | ||
1647 | static ssize_t cache_write_pipefs(struct file *filp, const char __user *buf, | |
1648 | size_t count, loff_t *ppos) | |
1649 | { | |
1650 | struct cache_detail *cd = RPC_I(filp->f_path.dentry->d_inode)->private; | |
1651 | ||
1652 | return cache_write(filp, buf, count, ppos, cd); | |
1653 | } | |
1654 | ||
1655 | static unsigned int cache_poll_pipefs(struct file *filp, poll_table *wait) | |
1656 | { | |
1657 | struct cache_detail *cd = RPC_I(filp->f_path.dentry->d_inode)->private; | |
1658 | ||
1659 | return cache_poll(filp, wait, cd); | |
1660 | } | |
1661 | ||
9918ff26 | 1662 | static long cache_ioctl_pipefs(struct file *filp, |
8854e82d TM |
1663 | unsigned int cmd, unsigned long arg) |
1664 | { | |
9918ff26 | 1665 | struct inode *inode = filp->f_dentry->d_inode; |
8854e82d | 1666 | struct cache_detail *cd = RPC_I(inode)->private; |
9918ff26 | 1667 | long ret; |
8854e82d | 1668 | |
9918ff26 FW |
1669 | lock_kernel(); |
1670 | ret = cache_ioctl(inode, filp, cmd, arg, cd); | |
1671 | unlock_kernel(); | |
1672 | ||
1673 | return ret; | |
8854e82d TM |
1674 | } |
1675 | ||
1676 | static int cache_open_pipefs(struct inode *inode, struct file *filp) | |
1677 | { | |
1678 | struct cache_detail *cd = RPC_I(inode)->private; | |
1679 | ||
1680 | return cache_open(inode, filp, cd); | |
1681 | } | |
1682 | ||
1683 | static int cache_release_pipefs(struct inode *inode, struct file *filp) | |
1684 | { | |
1685 | struct cache_detail *cd = RPC_I(inode)->private; | |
1686 | ||
1687 | return cache_release(inode, filp, cd); | |
1688 | } | |
1689 | ||
1690 | const struct file_operations cache_file_operations_pipefs = { | |
1691 | .owner = THIS_MODULE, | |
1692 | .llseek = no_llseek, | |
1693 | .read = cache_read_pipefs, | |
1694 | .write = cache_write_pipefs, | |
1695 | .poll = cache_poll_pipefs, | |
9918ff26 | 1696 | .unlocked_ioctl = cache_ioctl_pipefs, /* for FIONREAD */ |
8854e82d TM |
1697 | .open = cache_open_pipefs, |
1698 | .release = cache_release_pipefs, | |
1699 | }; | |
1700 | ||
1701 | static int content_open_pipefs(struct inode *inode, struct file *filp) | |
1702 | { | |
1703 | struct cache_detail *cd = RPC_I(inode)->private; | |
1704 | ||
1705 | return content_open(inode, filp, cd); | |
1706 | } | |
1707 | ||
f7e86ab9 TM |
1708 | static int content_release_pipefs(struct inode *inode, struct file *filp) |
1709 | { | |
1710 | struct cache_detail *cd = RPC_I(inode)->private; | |
1711 | ||
1712 | return content_release(inode, filp, cd); | |
1713 | } | |
1714 | ||
8854e82d TM |
1715 | const struct file_operations content_file_operations_pipefs = { |
1716 | .open = content_open_pipefs, | |
1717 | .read = seq_read, | |
1718 | .llseek = seq_lseek, | |
f7e86ab9 | 1719 | .release = content_release_pipefs, |
8854e82d TM |
1720 | }; |
1721 | ||
f7e86ab9 TM |
1722 | static int open_flush_pipefs(struct inode *inode, struct file *filp) |
1723 | { | |
1724 | struct cache_detail *cd = RPC_I(inode)->private; | |
1725 | ||
1726 | return open_flush(inode, filp, cd); | |
1727 | } | |
1728 | ||
1729 | static int release_flush_pipefs(struct inode *inode, struct file *filp) | |
1730 | { | |
1731 | struct cache_detail *cd = RPC_I(inode)->private; | |
1732 | ||
1733 | return release_flush(inode, filp, cd); | |
1734 | } | |
1735 | ||
8854e82d TM |
1736 | static ssize_t read_flush_pipefs(struct file *filp, char __user *buf, |
1737 | size_t count, loff_t *ppos) | |
1738 | { | |
1739 | struct cache_detail *cd = RPC_I(filp->f_path.dentry->d_inode)->private; | |
1740 | ||
1741 | return read_flush(filp, buf, count, ppos, cd); | |
1742 | } | |
1743 | ||
1744 | static ssize_t write_flush_pipefs(struct file *filp, | |
1745 | const char __user *buf, | |
1746 | size_t count, loff_t *ppos) | |
1747 | { | |
1748 | struct cache_detail *cd = RPC_I(filp->f_path.dentry->d_inode)->private; | |
1749 | ||
1750 | return write_flush(filp, buf, count, ppos, cd); | |
1751 | } | |
1752 | ||
1753 | const struct file_operations cache_flush_operations_pipefs = { | |
f7e86ab9 | 1754 | .open = open_flush_pipefs, |
8854e82d TM |
1755 | .read = read_flush_pipefs, |
1756 | .write = write_flush_pipefs, | |
f7e86ab9 | 1757 | .release = release_flush_pipefs, |
8854e82d TM |
1758 | }; |
1759 | ||
1760 | int sunrpc_cache_register_pipefs(struct dentry *parent, | |
1761 | const char *name, mode_t umode, | |
1762 | struct cache_detail *cd) | |
1763 | { | |
1764 | struct qstr q; | |
1765 | struct dentry *dir; | |
1766 | int ret = 0; | |
1767 | ||
1768 | sunrpc_init_cache_detail(cd); | |
1769 | q.name = name; | |
1770 | q.len = strlen(name); | |
1771 | q.hash = full_name_hash(q.name, q.len); | |
1772 | dir = rpc_create_cache_dir(parent, &q, umode, cd); | |
1773 | if (!IS_ERR(dir)) | |
1774 | cd->u.pipefs.dir = dir; | |
1775 | else { | |
1776 | sunrpc_destroy_cache_detail(cd); | |
1777 | ret = PTR_ERR(dir); | |
1778 | } | |
1779 | return ret; | |
1780 | } | |
1781 | EXPORT_SYMBOL_GPL(sunrpc_cache_register_pipefs); | |
1782 | ||
1783 | void sunrpc_cache_unregister_pipefs(struct cache_detail *cd) | |
1784 | { | |
1785 | rpc_remove_cache_dir(cd->u.pipefs.dir); | |
1786 | cd->u.pipefs.dir = NULL; | |
1787 | sunrpc_destroy_cache_detail(cd); | |
1788 | } | |
1789 | EXPORT_SYMBOL_GPL(sunrpc_cache_unregister_pipefs); | |
1790 |