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952efe7b DH |
1 | /* FS-Cache worker operation management routines |
2 | * | |
3 | * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | * See Documentation/filesystems/caching/operations.txt | |
12 | */ | |
13 | ||
14 | #define FSCACHE_DEBUG_LEVEL OPERATION | |
15 | #include <linux/module.h> | |
440f0aff | 16 | #include <linux/seq_file.h> |
5a0e3ad6 | 17 | #include <linux/slab.h> |
952efe7b DH |
18 | #include "internal.h" |
19 | ||
20 | atomic_t fscache_op_debug_id; | |
21 | EXPORT_SYMBOL(fscache_op_debug_id); | |
22 | ||
23 | /** | |
24 | * fscache_enqueue_operation - Enqueue an operation for processing | |
25 | * @op: The operation to enqueue | |
26 | * | |
27 | * Enqueue an operation for processing by the FS-Cache thread pool. | |
28 | * | |
29 | * This will get its own ref on the object. | |
30 | */ | |
31 | void fscache_enqueue_operation(struct fscache_operation *op) | |
32 | { | |
33 | _enter("{OBJ%x OP%x,%u}", | |
34 | op->object->debug_id, op->debug_id, atomic_read(&op->usage)); | |
35 | ||
5753c441 | 36 | ASSERT(list_empty(&op->pend_link)); |
952efe7b DH |
37 | ASSERT(op->processor != NULL); |
38 | ASSERTCMP(op->object->state, >=, FSCACHE_OBJECT_AVAILABLE); | |
39 | ASSERTCMP(atomic_read(&op->usage), >, 0); | |
9f10523f | 40 | ASSERTCMP(op->state, ==, FSCACHE_OP_ST_IN_PROGRESS); |
952efe7b | 41 | |
5753c441 DH |
42 | fscache_stat(&fscache_n_op_enqueue); |
43 | switch (op->flags & FSCACHE_OP_TYPE) { | |
8af7c124 TH |
44 | case FSCACHE_OP_ASYNC: |
45 | _debug("queue async"); | |
5753c441 | 46 | atomic_inc(&op->usage); |
8af7c124 | 47 | if (!queue_work(fscache_op_wq, &op->work)) |
5753c441 DH |
48 | fscache_put_operation(op); |
49 | break; | |
5753c441 DH |
50 | case FSCACHE_OP_MYTHREAD: |
51 | _debug("queue for caller's attention"); | |
52 | break; | |
53 | default: | |
54 | printk(KERN_ERR "FS-Cache: Unexpected op type %lx", | |
55 | op->flags); | |
56 | BUG(); | |
57 | break; | |
952efe7b DH |
58 | } |
59 | } | |
60 | EXPORT_SYMBOL(fscache_enqueue_operation); | |
61 | ||
62 | /* | |
63 | * start an op running | |
64 | */ | |
65 | static void fscache_run_op(struct fscache_object *object, | |
66 | struct fscache_operation *op) | |
67 | { | |
9f10523f DH |
68 | ASSERTCMP(op->state, ==, FSCACHE_OP_ST_PENDING); |
69 | ||
70 | op->state = FSCACHE_OP_ST_IN_PROGRESS; | |
952efe7b DH |
71 | object->n_in_progress++; |
72 | if (test_and_clear_bit(FSCACHE_OP_WAITING, &op->flags)) | |
73 | wake_up_bit(&op->flags, FSCACHE_OP_WAITING); | |
74 | if (op->processor) | |
75 | fscache_enqueue_operation(op); | |
76 | fscache_stat(&fscache_n_op_run); | |
77 | } | |
78 | ||
79 | /* | |
80 | * submit an exclusive operation for an object | |
81 | * - other ops are excluded from running simultaneously with this one | |
82 | * - this gets any extra refs it needs on an op | |
83 | */ | |
84 | int fscache_submit_exclusive_op(struct fscache_object *object, | |
85 | struct fscache_operation *op) | |
86 | { | |
8d76349d DH |
87 | int ret; |
88 | ||
952efe7b DH |
89 | _enter("{OBJ%x OP%x},", object->debug_id, op->debug_id); |
90 | ||
9f10523f DH |
91 | ASSERTCMP(op->state, ==, FSCACHE_OP_ST_INITIALISED); |
92 | ASSERTCMP(atomic_read(&op->usage), >, 0); | |
93 | ||
952efe7b DH |
94 | spin_lock(&object->lock); |
95 | ASSERTCMP(object->n_ops, >=, object->n_in_progress); | |
96 | ASSERTCMP(object->n_ops, >=, object->n_exclusive); | |
5753c441 | 97 | ASSERT(list_empty(&op->pend_link)); |
952efe7b | 98 | |
9f10523f | 99 | op->state = FSCACHE_OP_ST_PENDING; |
952efe7b DH |
100 | if (fscache_object_is_active(object)) { |
101 | op->object = object; | |
102 | object->n_ops++; | |
103 | object->n_exclusive++; /* reads and writes must wait */ | |
104 | ||
9f10523f | 105 | if (object->n_in_progress > 0) { |
952efe7b DH |
106 | atomic_inc(&op->usage); |
107 | list_add_tail(&op->pend_link, &object->pending_ops); | |
108 | fscache_stat(&fscache_n_op_pend); | |
109 | } else if (!list_empty(&object->pending_ops)) { | |
110 | atomic_inc(&op->usage); | |
111 | list_add_tail(&op->pend_link, &object->pending_ops); | |
112 | fscache_stat(&fscache_n_op_pend); | |
113 | fscache_start_operations(object); | |
114 | } else { | |
115 | ASSERTCMP(object->n_in_progress, ==, 0); | |
116 | fscache_run_op(object, op); | |
117 | } | |
118 | ||
119 | /* need to issue a new write op after this */ | |
120 | clear_bit(FSCACHE_OBJECT_PENDING_WRITE, &object->flags); | |
8d76349d | 121 | ret = 0; |
952efe7b DH |
122 | } else if (object->state == FSCACHE_OBJECT_CREATING) { |
123 | op->object = object; | |
124 | object->n_ops++; | |
125 | object->n_exclusive++; /* reads and writes must wait */ | |
126 | atomic_inc(&op->usage); | |
127 | list_add_tail(&op->pend_link, &object->pending_ops); | |
128 | fscache_stat(&fscache_n_op_pend); | |
8d76349d | 129 | ret = 0; |
952efe7b | 130 | } else { |
8d76349d DH |
131 | /* If we're in any other state, there must have been an I/O |
132 | * error of some nature. | |
133 | */ | |
134 | ASSERT(test_bit(FSCACHE_IOERROR, &object->cache->flags)); | |
135 | ret = -EIO; | |
952efe7b DH |
136 | } |
137 | ||
138 | spin_unlock(&object->lock); | |
8d76349d | 139 | return ret; |
952efe7b DH |
140 | } |
141 | ||
142 | /* | |
143 | * report an unexpected submission | |
144 | */ | |
145 | static void fscache_report_unexpected_submission(struct fscache_object *object, | |
146 | struct fscache_operation *op, | |
147 | unsigned long ostate) | |
148 | { | |
149 | static bool once_only; | |
150 | struct fscache_operation *p; | |
151 | unsigned n; | |
152 | ||
153 | if (once_only) | |
154 | return; | |
155 | once_only = true; | |
156 | ||
157 | kdebug("unexpected submission OP%x [OBJ%x %s]", | |
158 | op->debug_id, object->debug_id, | |
159 | fscache_object_states[object->state]); | |
160 | kdebug("objstate=%s [%s]", | |
161 | fscache_object_states[object->state], | |
162 | fscache_object_states[ostate]); | |
163 | kdebug("objflags=%lx", object->flags); | |
164 | kdebug("objevent=%lx [%lx]", object->events, object->event_mask); | |
165 | kdebug("ops=%u inp=%u exc=%u", | |
166 | object->n_ops, object->n_in_progress, object->n_exclusive); | |
167 | ||
168 | if (!list_empty(&object->pending_ops)) { | |
169 | n = 0; | |
170 | list_for_each_entry(p, &object->pending_ops, pend_link) { | |
171 | ASSERTCMP(p->object, ==, object); | |
172 | kdebug("%p %p", op->processor, op->release); | |
173 | n++; | |
174 | } | |
175 | ||
176 | kdebug("n=%u", n); | |
177 | } | |
178 | ||
179 | dump_stack(); | |
180 | } | |
181 | ||
182 | /* | |
183 | * submit an operation for an object | |
184 | * - objects may be submitted only in the following states: | |
185 | * - during object creation (write ops may be submitted) | |
186 | * - whilst the object is active | |
187 | * - after an I/O error incurred in one of the two above states (op rejected) | |
188 | * - this gets any extra refs it needs on an op | |
189 | */ | |
190 | int fscache_submit_op(struct fscache_object *object, | |
191 | struct fscache_operation *op) | |
192 | { | |
193 | unsigned long ostate; | |
194 | int ret; | |
195 | ||
196 | _enter("{OBJ%x OP%x},{%u}", | |
197 | object->debug_id, op->debug_id, atomic_read(&op->usage)); | |
198 | ||
9f10523f | 199 | ASSERTCMP(op->state, ==, FSCACHE_OP_ST_INITIALISED); |
952efe7b DH |
200 | ASSERTCMP(atomic_read(&op->usage), >, 0); |
201 | ||
202 | spin_lock(&object->lock); | |
203 | ASSERTCMP(object->n_ops, >=, object->n_in_progress); | |
204 | ASSERTCMP(object->n_ops, >=, object->n_exclusive); | |
5753c441 | 205 | ASSERT(list_empty(&op->pend_link)); |
952efe7b DH |
206 | |
207 | ostate = object->state; | |
208 | smp_rmb(); | |
209 | ||
9f10523f | 210 | op->state = FSCACHE_OP_ST_PENDING; |
952efe7b DH |
211 | if (fscache_object_is_active(object)) { |
212 | op->object = object; | |
213 | object->n_ops++; | |
214 | ||
215 | if (object->n_exclusive > 0) { | |
216 | atomic_inc(&op->usage); | |
217 | list_add_tail(&op->pend_link, &object->pending_ops); | |
218 | fscache_stat(&fscache_n_op_pend); | |
219 | } else if (!list_empty(&object->pending_ops)) { | |
220 | atomic_inc(&op->usage); | |
221 | list_add_tail(&op->pend_link, &object->pending_ops); | |
222 | fscache_stat(&fscache_n_op_pend); | |
223 | fscache_start_operations(object); | |
224 | } else { | |
225 | ASSERTCMP(object->n_exclusive, ==, 0); | |
226 | fscache_run_op(object, op); | |
227 | } | |
228 | ret = 0; | |
229 | } else if (object->state == FSCACHE_OBJECT_CREATING) { | |
230 | op->object = object; | |
231 | object->n_ops++; | |
232 | atomic_inc(&op->usage); | |
233 | list_add_tail(&op->pend_link, &object->pending_ops); | |
234 | fscache_stat(&fscache_n_op_pend); | |
235 | ret = 0; | |
e3d4d28b DH |
236 | } else if (object->state == FSCACHE_OBJECT_DYING || |
237 | object->state == FSCACHE_OBJECT_LC_DYING || | |
238 | object->state == FSCACHE_OBJECT_WITHDRAWING) { | |
239 | fscache_stat(&fscache_n_op_rejected); | |
9f10523f | 240 | op->state = FSCACHE_OP_ST_CANCELLED; |
e3d4d28b | 241 | ret = -ENOBUFS; |
952efe7b DH |
242 | } else if (!test_bit(FSCACHE_IOERROR, &object->cache->flags)) { |
243 | fscache_report_unexpected_submission(object, op, ostate); | |
244 | ASSERT(!fscache_object_is_active(object)); | |
9f10523f | 245 | op->state = FSCACHE_OP_ST_CANCELLED; |
952efe7b DH |
246 | ret = -ENOBUFS; |
247 | } else { | |
9f10523f | 248 | op->state = FSCACHE_OP_ST_CANCELLED; |
952efe7b DH |
249 | ret = -ENOBUFS; |
250 | } | |
251 | ||
252 | spin_unlock(&object->lock); | |
253 | return ret; | |
254 | } | |
255 | ||
256 | /* | |
257 | * queue an object for withdrawal on error, aborting all following asynchronous | |
258 | * operations | |
259 | */ | |
260 | void fscache_abort_object(struct fscache_object *object) | |
261 | { | |
262 | _enter("{OBJ%x}", object->debug_id); | |
263 | ||
264 | fscache_raise_event(object, FSCACHE_OBJECT_EV_ERROR); | |
265 | } | |
266 | ||
267 | /* | |
268 | * jump start the operation processing on an object | |
269 | * - caller must hold object->lock | |
270 | */ | |
271 | void fscache_start_operations(struct fscache_object *object) | |
272 | { | |
273 | struct fscache_operation *op; | |
274 | bool stop = false; | |
275 | ||
276 | while (!list_empty(&object->pending_ops) && !stop) { | |
277 | op = list_entry(object->pending_ops.next, | |
278 | struct fscache_operation, pend_link); | |
279 | ||
280 | if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags)) { | |
281 | if (object->n_in_progress > 0) | |
282 | break; | |
283 | stop = true; | |
284 | } | |
285 | list_del_init(&op->pend_link); | |
5753c441 | 286 | fscache_run_op(object, op); |
952efe7b DH |
287 | |
288 | /* the pending queue was holding a ref on the object */ | |
289 | fscache_put_operation(op); | |
290 | } | |
291 | ||
292 | ASSERTCMP(object->n_in_progress, <=, object->n_ops); | |
293 | ||
294 | _debug("woke %d ops on OBJ%x", | |
295 | object->n_in_progress, object->debug_id); | |
296 | } | |
297 | ||
5753c441 DH |
298 | /* |
299 | * cancel an operation that's pending on an object | |
300 | */ | |
91c7fbbf DH |
301 | int fscache_cancel_op(struct fscache_operation *op, |
302 | void (*do_cancel)(struct fscache_operation *)) | |
5753c441 DH |
303 | { |
304 | struct fscache_object *object = op->object; | |
305 | int ret; | |
306 | ||
307 | _enter("OBJ%x OP%x}", op->object->debug_id, op->debug_id); | |
308 | ||
9f10523f DH |
309 | ASSERTCMP(op->state, >=, FSCACHE_OP_ST_PENDING); |
310 | ASSERTCMP(op->state, !=, FSCACHE_OP_ST_CANCELLED); | |
311 | ASSERTCMP(atomic_read(&op->usage), >, 0); | |
312 | ||
5753c441 DH |
313 | spin_lock(&object->lock); |
314 | ||
315 | ret = -EBUSY; | |
9f10523f DH |
316 | if (op->state == FSCACHE_OP_ST_PENDING) { |
317 | ASSERT(!list_empty(&op->pend_link)); | |
5753c441 DH |
318 | fscache_stat(&fscache_n_op_cancelled); |
319 | list_del_init(&op->pend_link); | |
91c7fbbf DH |
320 | if (do_cancel) |
321 | do_cancel(op); | |
9f10523f | 322 | op->state = FSCACHE_OP_ST_CANCELLED; |
5753c441 DH |
323 | if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags)) |
324 | object->n_exclusive--; | |
325 | if (test_and_clear_bit(FSCACHE_OP_WAITING, &op->flags)) | |
326 | wake_up_bit(&op->flags, FSCACHE_OP_WAITING); | |
327 | fscache_put_operation(op); | |
328 | ret = 0; | |
329 | } | |
330 | ||
331 | spin_unlock(&object->lock); | |
332 | _leave(" = %d", ret); | |
333 | return ret; | |
334 | } | |
335 | ||
ef778e7a DH |
336 | /* |
337 | * Cancel all pending operations on an object | |
338 | */ | |
339 | void fscache_cancel_all_ops(struct fscache_object *object) | |
340 | { | |
341 | struct fscache_operation *op; | |
342 | ||
343 | _enter("OBJ%x", object->debug_id); | |
344 | ||
345 | spin_lock(&object->lock); | |
346 | ||
347 | while (!list_empty(&object->pending_ops)) { | |
348 | op = list_entry(object->pending_ops.next, | |
349 | struct fscache_operation, pend_link); | |
350 | fscache_stat(&fscache_n_op_cancelled); | |
351 | list_del_init(&op->pend_link); | |
352 | ||
353 | ASSERTCMP(op->state, ==, FSCACHE_OP_ST_PENDING); | |
354 | op->state = FSCACHE_OP_ST_CANCELLED; | |
355 | ||
356 | if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags)) | |
357 | object->n_exclusive--; | |
358 | if (test_and_clear_bit(FSCACHE_OP_WAITING, &op->flags)) | |
359 | wake_up_bit(&op->flags, FSCACHE_OP_WAITING); | |
360 | fscache_put_operation(op); | |
361 | cond_resched_lock(&object->lock); | |
362 | } | |
363 | ||
364 | spin_unlock(&object->lock); | |
365 | _leave(""); | |
366 | } | |
367 | ||
9f10523f | 368 | /* |
1f372dff | 369 | * Record the completion or cancellation of an in-progress operation. |
9f10523f | 370 | */ |
1f372dff | 371 | void fscache_op_complete(struct fscache_operation *op, bool cancelled) |
9f10523f DH |
372 | { |
373 | struct fscache_object *object = op->object; | |
374 | ||
375 | _enter("OBJ%x", object->debug_id); | |
376 | ||
377 | ASSERTCMP(op->state, ==, FSCACHE_OP_ST_IN_PROGRESS); | |
378 | ASSERTCMP(object->n_in_progress, >, 0); | |
379 | ASSERTIFCMP(test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags), | |
380 | object->n_exclusive, >, 0); | |
381 | ASSERTIFCMP(test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags), | |
382 | object->n_in_progress, ==, 1); | |
383 | ||
384 | spin_lock(&object->lock); | |
385 | ||
1f372dff DH |
386 | op->state = cancelled ? |
387 | FSCACHE_OP_ST_CANCELLED : FSCACHE_OP_ST_COMPLETE; | |
9f10523f DH |
388 | |
389 | if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags)) | |
390 | object->n_exclusive--; | |
391 | object->n_in_progress--; | |
392 | if (object->n_in_progress == 0) | |
393 | fscache_start_operations(object); | |
394 | ||
395 | spin_unlock(&object->lock); | |
396 | _leave(""); | |
397 | } | |
398 | EXPORT_SYMBOL(fscache_op_complete); | |
399 | ||
952efe7b DH |
400 | /* |
401 | * release an operation | |
402 | * - queues pending ops if this is the last in-progress op | |
403 | */ | |
404 | void fscache_put_operation(struct fscache_operation *op) | |
405 | { | |
406 | struct fscache_object *object; | |
407 | struct fscache_cache *cache; | |
408 | ||
409 | _enter("{OBJ%x OP%x,%d}", | |
410 | op->object->debug_id, op->debug_id, atomic_read(&op->usage)); | |
411 | ||
412 | ASSERTCMP(atomic_read(&op->usage), >, 0); | |
413 | ||
414 | if (!atomic_dec_and_test(&op->usage)) | |
415 | return; | |
416 | ||
417 | _debug("PUT OP"); | |
9f10523f DH |
418 | ASSERTIFCMP(op->state != FSCACHE_OP_ST_COMPLETE, |
419 | op->state, ==, FSCACHE_OP_ST_CANCELLED); | |
420 | op->state = FSCACHE_OP_ST_DEAD; | |
952efe7b DH |
421 | |
422 | fscache_stat(&fscache_n_op_release); | |
423 | ||
424 | if (op->release) { | |
425 | op->release(op); | |
426 | op->release = NULL; | |
427 | } | |
428 | ||
429 | object = op->object; | |
430 | ||
ef46ed88 DH |
431 | if (test_bit(FSCACHE_OP_DEC_READ_CNT, &op->flags)) { |
432 | if (atomic_dec_and_test(&object->n_reads)) { | |
433 | clear_bit(FSCACHE_COOKIE_WAITING_ON_READS, | |
434 | &object->cookie->flags); | |
435 | wake_up_bit(&object->cookie->flags, | |
436 | FSCACHE_COOKIE_WAITING_ON_READS); | |
437 | } | |
438 | } | |
4fbf4291 | 439 | |
952efe7b DH |
440 | /* now... we may get called with the object spinlock held, so we |
441 | * complete the cleanup here only if we can immediately acquire the | |
442 | * lock, and defer it otherwise */ | |
443 | if (!spin_trylock(&object->lock)) { | |
444 | _debug("defer put"); | |
445 | fscache_stat(&fscache_n_op_deferred_release); | |
446 | ||
447 | cache = object->cache; | |
448 | spin_lock(&cache->op_gc_list_lock); | |
449 | list_add_tail(&op->pend_link, &cache->op_gc_list); | |
450 | spin_unlock(&cache->op_gc_list_lock); | |
451 | schedule_work(&cache->op_gc); | |
452 | _leave(" [defer]"); | |
453 | return; | |
454 | } | |
455 | ||
952efe7b DH |
456 | ASSERTCMP(object->n_ops, >, 0); |
457 | object->n_ops--; | |
458 | if (object->n_ops == 0) | |
459 | fscache_raise_event(object, FSCACHE_OBJECT_EV_CLEARED); | |
460 | ||
461 | spin_unlock(&object->lock); | |
462 | ||
463 | kfree(op); | |
464 | _leave(" [done]"); | |
465 | } | |
466 | EXPORT_SYMBOL(fscache_put_operation); | |
467 | ||
468 | /* | |
469 | * garbage collect operations that have had their release deferred | |
470 | */ | |
471 | void fscache_operation_gc(struct work_struct *work) | |
472 | { | |
473 | struct fscache_operation *op; | |
474 | struct fscache_object *object; | |
475 | struct fscache_cache *cache = | |
476 | container_of(work, struct fscache_cache, op_gc); | |
477 | int count = 0; | |
478 | ||
479 | _enter(""); | |
480 | ||
481 | do { | |
482 | spin_lock(&cache->op_gc_list_lock); | |
483 | if (list_empty(&cache->op_gc_list)) { | |
484 | spin_unlock(&cache->op_gc_list_lock); | |
485 | break; | |
486 | } | |
487 | ||
488 | op = list_entry(cache->op_gc_list.next, | |
489 | struct fscache_operation, pend_link); | |
490 | list_del(&op->pend_link); | |
491 | spin_unlock(&cache->op_gc_list_lock); | |
492 | ||
493 | object = op->object; | |
9f10523f | 494 | spin_lock(&object->lock); |
952efe7b DH |
495 | |
496 | _debug("GC DEFERRED REL OBJ%x OP%x", | |
497 | object->debug_id, op->debug_id); | |
498 | fscache_stat(&fscache_n_op_gc); | |
499 | ||
500 | ASSERTCMP(atomic_read(&op->usage), ==, 0); | |
9f10523f | 501 | ASSERTCMP(op->state, ==, FSCACHE_OP_ST_DEAD); |
952efe7b DH |
502 | |
503 | ASSERTCMP(object->n_ops, >, 0); | |
504 | object->n_ops--; | |
505 | if (object->n_ops == 0) | |
506 | fscache_raise_event(object, FSCACHE_OBJECT_EV_CLEARED); | |
507 | ||
508 | spin_unlock(&object->lock); | |
9f10523f | 509 | kfree(op); |
952efe7b DH |
510 | |
511 | } while (count++ < 20); | |
512 | ||
513 | if (!list_empty(&cache->op_gc_list)) | |
514 | schedule_work(&cache->op_gc); | |
515 | ||
516 | _leave(""); | |
517 | } | |
518 | ||
519 | /* | |
8af7c124 TH |
520 | * execute an operation using fs_op_wq to provide processing context - |
521 | * the caller holds a ref to this object, so we don't need to hold one | |
952efe7b | 522 | */ |
8af7c124 | 523 | void fscache_op_work_func(struct work_struct *work) |
952efe7b DH |
524 | { |
525 | struct fscache_operation *op = | |
8af7c124 | 526 | container_of(work, struct fscache_operation, work); |
952efe7b DH |
527 | unsigned long start; |
528 | ||
529 | _enter("{OBJ%x OP%x,%d}", | |
530 | op->object->debug_id, op->debug_id, atomic_read(&op->usage)); | |
531 | ||
532 | ASSERT(op->processor != NULL); | |
533 | start = jiffies; | |
534 | op->processor(op); | |
535 | fscache_hist(fscache_ops_histogram, start); | |
8af7c124 | 536 | fscache_put_operation(op); |
952efe7b DH |
537 | |
538 | _leave(""); | |
539 | } |