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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 | ||
d3b97ca4 DH |
23 | static void fscache_operation_dummy_cancel(struct fscache_operation *op) |
24 | { | |
25 | } | |
26 | ||
1339ec98 DH |
27 | /** |
28 | * fscache_operation_init - Do basic initialisation of an operation | |
29 | * @op: The operation to initialise | |
30 | * @release: The release function to assign | |
31 | * | |
32 | * Do basic initialisation of an operation. The caller must still set flags, | |
33 | * object and processor if needed. | |
34 | */ | |
35 | void fscache_operation_init(struct fscache_operation *op, | |
36 | fscache_operation_processor_t processor, | |
d3b97ca4 | 37 | fscache_operation_cancel_t cancel, |
1339ec98 DH |
38 | fscache_operation_release_t release) |
39 | { | |
40 | INIT_WORK(&op->work, fscache_op_work_func); | |
41 | atomic_set(&op->usage, 1); | |
42 | op->state = FSCACHE_OP_ST_INITIALISED; | |
43 | op->debug_id = atomic_inc_return(&fscache_op_debug_id); | |
44 | op->processor = processor; | |
d3b97ca4 | 45 | op->cancel = cancel ?: fscache_operation_dummy_cancel; |
1339ec98 DH |
46 | op->release = release; |
47 | INIT_LIST_HEAD(&op->pend_link); | |
03cdd0e4 | 48 | fscache_stat(&fscache_n_op_initialised); |
1339ec98 DH |
49 | } |
50 | EXPORT_SYMBOL(fscache_operation_init); | |
51 | ||
952efe7b DH |
52 | /** |
53 | * fscache_enqueue_operation - Enqueue an operation for processing | |
54 | * @op: The operation to enqueue | |
55 | * | |
56 | * Enqueue an operation for processing by the FS-Cache thread pool. | |
57 | * | |
58 | * This will get its own ref on the object. | |
59 | */ | |
60 | void fscache_enqueue_operation(struct fscache_operation *op) | |
61 | { | |
62 | _enter("{OBJ%x OP%x,%u}", | |
63 | op->object->debug_id, op->debug_id, atomic_read(&op->usage)); | |
64 | ||
5753c441 | 65 | ASSERT(list_empty(&op->pend_link)); |
952efe7b | 66 | ASSERT(op->processor != NULL); |
493f7bc1 | 67 | ASSERT(fscache_object_is_available(op->object)); |
952efe7b | 68 | ASSERTCMP(atomic_read(&op->usage), >, 0); |
9f10523f | 69 | ASSERTCMP(op->state, ==, FSCACHE_OP_ST_IN_PROGRESS); |
952efe7b | 70 | |
5753c441 DH |
71 | fscache_stat(&fscache_n_op_enqueue); |
72 | switch (op->flags & FSCACHE_OP_TYPE) { | |
8af7c124 TH |
73 | case FSCACHE_OP_ASYNC: |
74 | _debug("queue async"); | |
5753c441 | 75 | atomic_inc(&op->usage); |
8af7c124 | 76 | if (!queue_work(fscache_op_wq, &op->work)) |
5753c441 DH |
77 | fscache_put_operation(op); |
78 | break; | |
5753c441 DH |
79 | case FSCACHE_OP_MYTHREAD: |
80 | _debug("queue for caller's attention"); | |
81 | break; | |
82 | default: | |
36dfd116 | 83 | pr_err("Unexpected op type %lx", op->flags); |
5753c441 DH |
84 | BUG(); |
85 | break; | |
952efe7b DH |
86 | } |
87 | } | |
88 | EXPORT_SYMBOL(fscache_enqueue_operation); | |
89 | ||
90 | /* | |
91 | * start an op running | |
92 | */ | |
93 | static void fscache_run_op(struct fscache_object *object, | |
94 | struct fscache_operation *op) | |
95 | { | |
9f10523f DH |
96 | ASSERTCMP(op->state, ==, FSCACHE_OP_ST_PENDING); |
97 | ||
98 | op->state = FSCACHE_OP_ST_IN_PROGRESS; | |
952efe7b DH |
99 | object->n_in_progress++; |
100 | if (test_and_clear_bit(FSCACHE_OP_WAITING, &op->flags)) | |
101 | wake_up_bit(&op->flags, FSCACHE_OP_WAITING); | |
102 | if (op->processor) | |
103 | fscache_enqueue_operation(op); | |
104 | fscache_stat(&fscache_n_op_run); | |
105 | } | |
106 | ||
3c305984 DH |
107 | /* |
108 | * report an unexpected submission | |
109 | */ | |
110 | static void fscache_report_unexpected_submission(struct fscache_object *object, | |
111 | struct fscache_operation *op, | |
112 | const struct fscache_state *ostate) | |
113 | { | |
114 | static bool once_only; | |
115 | struct fscache_operation *p; | |
116 | unsigned n; | |
117 | ||
118 | if (once_only) | |
119 | return; | |
120 | once_only = true; | |
121 | ||
122 | kdebug("unexpected submission OP%x [OBJ%x %s]", | |
123 | op->debug_id, object->debug_id, object->state->name); | |
124 | kdebug("objstate=%s [%s]", object->state->name, ostate->name); | |
125 | kdebug("objflags=%lx", object->flags); | |
126 | kdebug("objevent=%lx [%lx]", object->events, object->event_mask); | |
127 | kdebug("ops=%u inp=%u exc=%u", | |
128 | object->n_ops, object->n_in_progress, object->n_exclusive); | |
129 | ||
130 | if (!list_empty(&object->pending_ops)) { | |
131 | n = 0; | |
132 | list_for_each_entry(p, &object->pending_ops, pend_link) { | |
133 | ASSERTCMP(p->object, ==, object); | |
134 | kdebug("%p %p", op->processor, op->release); | |
135 | n++; | |
136 | } | |
137 | ||
138 | kdebug("n=%u", n); | |
139 | } | |
140 | ||
141 | dump_stack(); | |
142 | } | |
143 | ||
952efe7b DH |
144 | /* |
145 | * submit an exclusive operation for an object | |
146 | * - other ops are excluded from running simultaneously with this one | |
147 | * - this gets any extra refs it needs on an op | |
148 | */ | |
149 | int fscache_submit_exclusive_op(struct fscache_object *object, | |
150 | struct fscache_operation *op) | |
151 | { | |
30ceec62 DH |
152 | const struct fscache_state *ostate; |
153 | unsigned long flags; | |
8d76349d DH |
154 | int ret; |
155 | ||
952efe7b DH |
156 | _enter("{OBJ%x OP%x},", object->debug_id, op->debug_id); |
157 | ||
9f10523f DH |
158 | ASSERTCMP(op->state, ==, FSCACHE_OP_ST_INITIALISED); |
159 | ASSERTCMP(atomic_read(&op->usage), >, 0); | |
160 | ||
952efe7b DH |
161 | spin_lock(&object->lock); |
162 | ASSERTCMP(object->n_ops, >=, object->n_in_progress); | |
163 | ASSERTCMP(object->n_ops, >=, object->n_exclusive); | |
5753c441 | 164 | ASSERT(list_empty(&op->pend_link)); |
952efe7b | 165 | |
30ceec62 DH |
166 | ostate = object->state; |
167 | smp_rmb(); | |
168 | ||
9f10523f | 169 | op->state = FSCACHE_OP_ST_PENDING; |
30ceec62 DH |
170 | flags = READ_ONCE(object->flags); |
171 | if (unlikely(!(flags & BIT(FSCACHE_OBJECT_IS_LIVE)))) { | |
172 | fscache_stat(&fscache_n_op_rejected); | |
d3b97ca4 | 173 | op->cancel(op); |
30ceec62 DH |
174 | op->state = FSCACHE_OP_ST_CANCELLED; |
175 | ret = -ENOBUFS; | |
176 | } else if (unlikely(fscache_cache_is_broken(object))) { | |
d3b97ca4 | 177 | op->cancel(op); |
30ceec62 DH |
178 | op->state = FSCACHE_OP_ST_CANCELLED; |
179 | ret = -EIO; | |
180 | } else if (flags & BIT(FSCACHE_OBJECT_IS_AVAILABLE)) { | |
952efe7b DH |
181 | op->object = object; |
182 | object->n_ops++; | |
183 | object->n_exclusive++; /* reads and writes must wait */ | |
184 | ||
9f10523f | 185 | if (object->n_in_progress > 0) { |
952efe7b DH |
186 | atomic_inc(&op->usage); |
187 | list_add_tail(&op->pend_link, &object->pending_ops); | |
188 | fscache_stat(&fscache_n_op_pend); | |
189 | } else if (!list_empty(&object->pending_ops)) { | |
190 | atomic_inc(&op->usage); | |
191 | list_add_tail(&op->pend_link, &object->pending_ops); | |
192 | fscache_stat(&fscache_n_op_pend); | |
193 | fscache_start_operations(object); | |
194 | } else { | |
195 | ASSERTCMP(object->n_in_progress, ==, 0); | |
196 | fscache_run_op(object, op); | |
197 | } | |
198 | ||
199 | /* need to issue a new write op after this */ | |
200 | clear_bit(FSCACHE_OBJECT_PENDING_WRITE, &object->flags); | |
8d76349d | 201 | ret = 0; |
30ceec62 | 202 | } else if (flags & BIT(FSCACHE_OBJECT_IS_LOOKED_UP)) { |
952efe7b DH |
203 | op->object = object; |
204 | object->n_ops++; | |
205 | object->n_exclusive++; /* reads and writes must wait */ | |
206 | atomic_inc(&op->usage); | |
207 | list_add_tail(&op->pend_link, &object->pending_ops); | |
208 | fscache_stat(&fscache_n_op_pend); | |
8d76349d | 209 | ret = 0; |
6515d1db | 210 | } else if (flags & BIT(FSCACHE_OBJECT_KILLED_BY_CACHE)) { |
d3b97ca4 | 211 | op->cancel(op); |
6515d1db DH |
212 | op->state = FSCACHE_OP_ST_CANCELLED; |
213 | ret = -ENOBUFS; | |
952efe7b | 214 | } else { |
30ceec62 | 215 | fscache_report_unexpected_submission(object, op, ostate); |
d3b97ca4 | 216 | op->cancel(op); |
30ceec62 DH |
217 | op->state = FSCACHE_OP_ST_CANCELLED; |
218 | ret = -ENOBUFS; | |
952efe7b DH |
219 | } |
220 | ||
221 | spin_unlock(&object->lock); | |
8d76349d | 222 | return ret; |
952efe7b DH |
223 | } |
224 | ||
952efe7b DH |
225 | /* |
226 | * submit an operation for an object | |
227 | * - objects may be submitted only in the following states: | |
228 | * - during object creation (write ops may be submitted) | |
229 | * - whilst the object is active | |
230 | * - after an I/O error incurred in one of the two above states (op rejected) | |
231 | * - this gets any extra refs it needs on an op | |
232 | */ | |
233 | int fscache_submit_op(struct fscache_object *object, | |
234 | struct fscache_operation *op) | |
235 | { | |
caaef690 | 236 | const struct fscache_state *ostate; |
30ceec62 | 237 | unsigned long flags; |
952efe7b DH |
238 | int ret; |
239 | ||
240 | _enter("{OBJ%x OP%x},{%u}", | |
241 | object->debug_id, op->debug_id, atomic_read(&op->usage)); | |
242 | ||
9f10523f | 243 | ASSERTCMP(op->state, ==, FSCACHE_OP_ST_INITIALISED); |
952efe7b DH |
244 | ASSERTCMP(atomic_read(&op->usage), >, 0); |
245 | ||
246 | spin_lock(&object->lock); | |
247 | ASSERTCMP(object->n_ops, >=, object->n_in_progress); | |
248 | ASSERTCMP(object->n_ops, >=, object->n_exclusive); | |
5753c441 | 249 | ASSERT(list_empty(&op->pend_link)); |
952efe7b DH |
250 | |
251 | ostate = object->state; | |
252 | smp_rmb(); | |
253 | ||
9f10523f | 254 | op->state = FSCACHE_OP_ST_PENDING; |
30ceec62 DH |
255 | flags = READ_ONCE(object->flags); |
256 | if (unlikely(!(flags & BIT(FSCACHE_OBJECT_IS_LIVE)))) { | |
257 | fscache_stat(&fscache_n_op_rejected); | |
d3b97ca4 | 258 | op->cancel(op); |
30ceec62 DH |
259 | op->state = FSCACHE_OP_ST_CANCELLED; |
260 | ret = -ENOBUFS; | |
261 | } else if (unlikely(fscache_cache_is_broken(object))) { | |
d3b97ca4 | 262 | op->cancel(op); |
30ceec62 DH |
263 | op->state = FSCACHE_OP_ST_CANCELLED; |
264 | ret = -EIO; | |
265 | } else if (flags & BIT(FSCACHE_OBJECT_IS_AVAILABLE)) { | |
952efe7b DH |
266 | op->object = object; |
267 | object->n_ops++; | |
268 | ||
269 | if (object->n_exclusive > 0) { | |
270 | atomic_inc(&op->usage); | |
271 | list_add_tail(&op->pend_link, &object->pending_ops); | |
272 | fscache_stat(&fscache_n_op_pend); | |
273 | } else if (!list_empty(&object->pending_ops)) { | |
274 | atomic_inc(&op->usage); | |
275 | list_add_tail(&op->pend_link, &object->pending_ops); | |
276 | fscache_stat(&fscache_n_op_pend); | |
277 | fscache_start_operations(object); | |
278 | } else { | |
279 | ASSERTCMP(object->n_exclusive, ==, 0); | |
280 | fscache_run_op(object, op); | |
281 | } | |
282 | ret = 0; | |
30ceec62 | 283 | } else if (flags & BIT(FSCACHE_OBJECT_IS_LOOKED_UP)) { |
952efe7b DH |
284 | op->object = object; |
285 | object->n_ops++; | |
286 | atomic_inc(&op->usage); | |
287 | list_add_tail(&op->pend_link, &object->pending_ops); | |
288 | fscache_stat(&fscache_n_op_pend); | |
289 | ret = 0; | |
6515d1db | 290 | } else if (flags & BIT(FSCACHE_OBJECT_KILLED_BY_CACHE)) { |
d3b97ca4 | 291 | op->cancel(op); |
6515d1db DH |
292 | op->state = FSCACHE_OP_ST_CANCELLED; |
293 | ret = -ENOBUFS; | |
30ceec62 | 294 | } else { |
952efe7b DH |
295 | fscache_report_unexpected_submission(object, op, ostate); |
296 | ASSERT(!fscache_object_is_active(object)); | |
d3b97ca4 | 297 | op->cancel(op); |
9f10523f | 298 | op->state = FSCACHE_OP_ST_CANCELLED; |
952efe7b | 299 | ret = -ENOBUFS; |
952efe7b DH |
300 | } |
301 | ||
302 | spin_unlock(&object->lock); | |
303 | return ret; | |
304 | } | |
305 | ||
306 | /* | |
307 | * queue an object for withdrawal on error, aborting all following asynchronous | |
308 | * operations | |
309 | */ | |
310 | void fscache_abort_object(struct fscache_object *object) | |
311 | { | |
312 | _enter("{OBJ%x}", object->debug_id); | |
313 | ||
314 | fscache_raise_event(object, FSCACHE_OBJECT_EV_ERROR); | |
315 | } | |
316 | ||
317 | /* | |
dcfae32f DH |
318 | * Jump start the operation processing on an object. The caller must hold |
319 | * object->lock. | |
952efe7b DH |
320 | */ |
321 | void fscache_start_operations(struct fscache_object *object) | |
322 | { | |
323 | struct fscache_operation *op; | |
324 | bool stop = false; | |
325 | ||
326 | while (!list_empty(&object->pending_ops) && !stop) { | |
327 | op = list_entry(object->pending_ops.next, | |
328 | struct fscache_operation, pend_link); | |
329 | ||
330 | if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags)) { | |
331 | if (object->n_in_progress > 0) | |
332 | break; | |
333 | stop = true; | |
334 | } | |
335 | list_del_init(&op->pend_link); | |
5753c441 | 336 | fscache_run_op(object, op); |
952efe7b DH |
337 | |
338 | /* the pending queue was holding a ref on the object */ | |
339 | fscache_put_operation(op); | |
340 | } | |
341 | ||
342 | ASSERTCMP(object->n_in_progress, <=, object->n_ops); | |
343 | ||
344 | _debug("woke %d ops on OBJ%x", | |
345 | object->n_in_progress, object->debug_id); | |
346 | } | |
347 | ||
5753c441 DH |
348 | /* |
349 | * cancel an operation that's pending on an object | |
350 | */ | |
91c7fbbf | 351 | int fscache_cancel_op(struct fscache_operation *op, |
418b7eb9 | 352 | bool cancel_in_progress_op) |
5753c441 DH |
353 | { |
354 | struct fscache_object *object = op->object; | |
418b7eb9 | 355 | bool put = false; |
5753c441 DH |
356 | int ret; |
357 | ||
358 | _enter("OBJ%x OP%x}", op->object->debug_id, op->debug_id); | |
359 | ||
9f10523f DH |
360 | ASSERTCMP(op->state, >=, FSCACHE_OP_ST_PENDING); |
361 | ASSERTCMP(op->state, !=, FSCACHE_OP_ST_CANCELLED); | |
362 | ASSERTCMP(atomic_read(&op->usage), >, 0); | |
363 | ||
5753c441 DH |
364 | spin_lock(&object->lock); |
365 | ||
366 | ret = -EBUSY; | |
9f10523f DH |
367 | if (op->state == FSCACHE_OP_ST_PENDING) { |
368 | ASSERT(!list_empty(&op->pend_link)); | |
5753c441 | 369 | list_del_init(&op->pend_link); |
418b7eb9 | 370 | put = true; |
d3b97ca4 | 371 | |
418b7eb9 | 372 | fscache_stat(&fscache_n_op_cancelled); |
d3b97ca4 | 373 | op->cancel(op); |
418b7eb9 DH |
374 | op->state = FSCACHE_OP_ST_CANCELLED; |
375 | if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags)) | |
376 | object->n_exclusive--; | |
377 | if (test_and_clear_bit(FSCACHE_OP_WAITING, &op->flags)) | |
378 | wake_up_bit(&op->flags, FSCACHE_OP_WAITING); | |
379 | ret = 0; | |
380 | } else if (op->state == FSCACHE_OP_ST_IN_PROGRESS && cancel_in_progress_op) { | |
73c04a47 DH |
381 | ASSERTCMP(object->n_in_progress, >, 0); |
382 | if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags)) | |
383 | object->n_exclusive--; | |
384 | object->n_in_progress--; | |
385 | if (object->n_in_progress == 0) | |
386 | fscache_start_operations(object); | |
387 | ||
418b7eb9 | 388 | fscache_stat(&fscache_n_op_cancelled); |
d3b97ca4 | 389 | op->cancel(op); |
9f10523f | 390 | op->state = FSCACHE_OP_ST_CANCELLED; |
5753c441 DH |
391 | if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags)) |
392 | object->n_exclusive--; | |
393 | if (test_and_clear_bit(FSCACHE_OP_WAITING, &op->flags)) | |
394 | wake_up_bit(&op->flags, FSCACHE_OP_WAITING); | |
5753c441 DH |
395 | ret = 0; |
396 | } | |
397 | ||
418b7eb9 DH |
398 | if (put) |
399 | fscache_put_operation(op); | |
5753c441 DH |
400 | spin_unlock(&object->lock); |
401 | _leave(" = %d", ret); | |
402 | return ret; | |
403 | } | |
404 | ||
ef778e7a DH |
405 | /* |
406 | * Cancel all pending operations on an object | |
407 | */ | |
408 | void fscache_cancel_all_ops(struct fscache_object *object) | |
409 | { | |
410 | struct fscache_operation *op; | |
411 | ||
412 | _enter("OBJ%x", object->debug_id); | |
413 | ||
414 | spin_lock(&object->lock); | |
415 | ||
416 | while (!list_empty(&object->pending_ops)) { | |
417 | op = list_entry(object->pending_ops.next, | |
418 | struct fscache_operation, pend_link); | |
419 | fscache_stat(&fscache_n_op_cancelled); | |
420 | list_del_init(&op->pend_link); | |
421 | ||
422 | ASSERTCMP(op->state, ==, FSCACHE_OP_ST_PENDING); | |
d3b97ca4 | 423 | op->cancel(op); |
ef778e7a DH |
424 | op->state = FSCACHE_OP_ST_CANCELLED; |
425 | ||
426 | if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags)) | |
427 | object->n_exclusive--; | |
428 | if (test_and_clear_bit(FSCACHE_OP_WAITING, &op->flags)) | |
429 | wake_up_bit(&op->flags, FSCACHE_OP_WAITING); | |
430 | fscache_put_operation(op); | |
431 | cond_resched_lock(&object->lock); | |
432 | } | |
433 | ||
434 | spin_unlock(&object->lock); | |
435 | _leave(""); | |
436 | } | |
437 | ||
9f10523f | 438 | /* |
1f372dff | 439 | * Record the completion or cancellation of an in-progress operation. |
9f10523f | 440 | */ |
1f372dff | 441 | void fscache_op_complete(struct fscache_operation *op, bool cancelled) |
9f10523f DH |
442 | { |
443 | struct fscache_object *object = op->object; | |
444 | ||
445 | _enter("OBJ%x", object->debug_id); | |
446 | ||
447 | ASSERTCMP(op->state, ==, FSCACHE_OP_ST_IN_PROGRESS); | |
448 | ASSERTCMP(object->n_in_progress, >, 0); | |
449 | ASSERTIFCMP(test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags), | |
450 | object->n_exclusive, >, 0); | |
451 | ASSERTIFCMP(test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags), | |
452 | object->n_in_progress, ==, 1); | |
453 | ||
454 | spin_lock(&object->lock); | |
455 | ||
d3b97ca4 DH |
456 | if (!cancelled) { |
457 | op->state = FSCACHE_OP_ST_COMPLETE; | |
458 | } else { | |
459 | op->cancel(op); | |
460 | op->state = FSCACHE_OP_ST_CANCELLED; | |
461 | } | |
9f10523f DH |
462 | |
463 | if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags)) | |
464 | object->n_exclusive--; | |
465 | object->n_in_progress--; | |
466 | if (object->n_in_progress == 0) | |
467 | fscache_start_operations(object); | |
468 | ||
469 | spin_unlock(&object->lock); | |
470 | _leave(""); | |
471 | } | |
472 | EXPORT_SYMBOL(fscache_op_complete); | |
473 | ||
952efe7b DH |
474 | /* |
475 | * release an operation | |
476 | * - queues pending ops if this is the last in-progress op | |
477 | */ | |
478 | void fscache_put_operation(struct fscache_operation *op) | |
479 | { | |
480 | struct fscache_object *object; | |
481 | struct fscache_cache *cache; | |
482 | ||
483 | _enter("{OBJ%x OP%x,%d}", | |
484 | op->object->debug_id, op->debug_id, atomic_read(&op->usage)); | |
485 | ||
486 | ASSERTCMP(atomic_read(&op->usage), >, 0); | |
487 | ||
488 | if (!atomic_dec_and_test(&op->usage)) | |
489 | return; | |
490 | ||
491 | _debug("PUT OP"); | |
a39caadf DH |
492 | ASSERTIFCMP(op->state != FSCACHE_OP_ST_INITIALISED && |
493 | op->state != FSCACHE_OP_ST_COMPLETE, | |
9f10523f | 494 | op->state, ==, FSCACHE_OP_ST_CANCELLED); |
952efe7b DH |
495 | |
496 | fscache_stat(&fscache_n_op_release); | |
497 | ||
498 | if (op->release) { | |
499 | op->release(op); | |
500 | op->release = NULL; | |
501 | } | |
4a47132f | 502 | op->state = FSCACHE_OP_ST_DEAD; |
952efe7b DH |
503 | |
504 | object = op->object; | |
a39caadf DH |
505 | if (likely(object)) { |
506 | if (test_bit(FSCACHE_OP_DEC_READ_CNT, &op->flags)) | |
507 | atomic_dec(&object->n_reads); | |
508 | if (test_bit(FSCACHE_OP_UNUSE_COOKIE, &op->flags)) | |
509 | fscache_unuse_cookie(object); | |
510 | ||
511 | /* now... we may get called with the object spinlock held, so we | |
512 | * complete the cleanup here only if we can immediately acquire the | |
513 | * lock, and defer it otherwise */ | |
514 | if (!spin_trylock(&object->lock)) { | |
515 | _debug("defer put"); | |
516 | fscache_stat(&fscache_n_op_deferred_release); | |
517 | ||
518 | cache = object->cache; | |
519 | spin_lock(&cache->op_gc_list_lock); | |
520 | list_add_tail(&op->pend_link, &cache->op_gc_list); | |
521 | spin_unlock(&cache->op_gc_list_lock); | |
522 | schedule_work(&cache->op_gc); | |
523 | _leave(" [defer]"); | |
524 | return; | |
525 | } | |
952efe7b | 526 | |
a39caadf DH |
527 | ASSERTCMP(object->n_ops, >, 0); |
528 | object->n_ops--; | |
529 | if (object->n_ops == 0) | |
530 | fscache_raise_event(object, FSCACHE_OBJECT_EV_CLEARED); | |
952efe7b | 531 | |
a39caadf | 532 | spin_unlock(&object->lock); |
952efe7b DH |
533 | } |
534 | ||
952efe7b DH |
535 | kfree(op); |
536 | _leave(" [done]"); | |
537 | } | |
538 | EXPORT_SYMBOL(fscache_put_operation); | |
539 | ||
540 | /* | |
541 | * garbage collect operations that have had their release deferred | |
542 | */ | |
543 | void fscache_operation_gc(struct work_struct *work) | |
544 | { | |
545 | struct fscache_operation *op; | |
546 | struct fscache_object *object; | |
547 | struct fscache_cache *cache = | |
548 | container_of(work, struct fscache_cache, op_gc); | |
549 | int count = 0; | |
550 | ||
551 | _enter(""); | |
552 | ||
553 | do { | |
554 | spin_lock(&cache->op_gc_list_lock); | |
555 | if (list_empty(&cache->op_gc_list)) { | |
556 | spin_unlock(&cache->op_gc_list_lock); | |
557 | break; | |
558 | } | |
559 | ||
560 | op = list_entry(cache->op_gc_list.next, | |
561 | struct fscache_operation, pend_link); | |
562 | list_del(&op->pend_link); | |
563 | spin_unlock(&cache->op_gc_list_lock); | |
564 | ||
565 | object = op->object; | |
9f10523f | 566 | spin_lock(&object->lock); |
952efe7b DH |
567 | |
568 | _debug("GC DEFERRED REL OBJ%x OP%x", | |
569 | object->debug_id, op->debug_id); | |
570 | fscache_stat(&fscache_n_op_gc); | |
571 | ||
572 | ASSERTCMP(atomic_read(&op->usage), ==, 0); | |
9f10523f | 573 | ASSERTCMP(op->state, ==, FSCACHE_OP_ST_DEAD); |
952efe7b DH |
574 | |
575 | ASSERTCMP(object->n_ops, >, 0); | |
576 | object->n_ops--; | |
577 | if (object->n_ops == 0) | |
578 | fscache_raise_event(object, FSCACHE_OBJECT_EV_CLEARED); | |
579 | ||
580 | spin_unlock(&object->lock); | |
9f10523f | 581 | kfree(op); |
952efe7b DH |
582 | |
583 | } while (count++ < 20); | |
584 | ||
585 | if (!list_empty(&cache->op_gc_list)) | |
586 | schedule_work(&cache->op_gc); | |
587 | ||
588 | _leave(""); | |
589 | } | |
590 | ||
591 | /* | |
8af7c124 TH |
592 | * execute an operation using fs_op_wq to provide processing context - |
593 | * the caller holds a ref to this object, so we don't need to hold one | |
952efe7b | 594 | */ |
8af7c124 | 595 | void fscache_op_work_func(struct work_struct *work) |
952efe7b DH |
596 | { |
597 | struct fscache_operation *op = | |
8af7c124 | 598 | container_of(work, struct fscache_operation, work); |
952efe7b DH |
599 | unsigned long start; |
600 | ||
601 | _enter("{OBJ%x OP%x,%d}", | |
602 | op->object->debug_id, op->debug_id, atomic_read(&op->usage)); | |
603 | ||
604 | ASSERT(op->processor != NULL); | |
605 | start = jiffies; | |
606 | op->processor(op); | |
607 | fscache_hist(fscache_ops_histogram, start); | |
8af7c124 | 608 | fscache_put_operation(op); |
952efe7b DH |
609 | |
610 | _leave(""); | |
611 | } |