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b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3 | * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. | |
4 | * | |
5 | * This copyrighted material is made available to anyone wishing to use, | |
6 | * modify, copy, or redistribute it subject to the terms and conditions | |
7 | * of the GNU General Public License v.2. | |
8 | */ | |
9 | ||
10 | #include <linux/sched.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/completion.h> | |
14 | #include <linux/buffer_head.h> | |
15 | #include <linux/delay.h> | |
16 | #include <linux/sort.h> | |
17 | #include <linux/jhash.h> | |
18 | #include <linux/kref.h> | |
d0dc80db | 19 | #include <linux/kallsyms.h> |
5c676f6d | 20 | #include <linux/gfs2_ondisk.h> |
b3b94faa DT |
21 | #include <asm/semaphore.h> |
22 | #include <asm/uaccess.h> | |
23 | ||
24 | #include "gfs2.h" | |
5c676f6d SW |
25 | #include "lm_interface.h" |
26 | #include "incore.h" | |
b3b94faa DT |
27 | #include "glock.h" |
28 | #include "glops.h" | |
29 | #include "inode.h" | |
30 | #include "lm.h" | |
31 | #include "lops.h" | |
32 | #include "meta_io.h" | |
33 | #include "quota.h" | |
34 | #include "super.h" | |
5c676f6d | 35 | #include "util.h" |
b3b94faa DT |
36 | |
37 | /* Must be kept in sync with the beginning of struct gfs2_glock */ | |
38 | struct glock_plug { | |
39 | struct list_head gl_list; | |
40 | unsigned long gl_flags; | |
41 | }; | |
42 | ||
43 | struct greedy { | |
44 | struct gfs2_holder gr_gh; | |
45 | struct work_struct gr_work; | |
46 | }; | |
47 | ||
48 | typedef void (*glock_examiner) (struct gfs2_glock * gl); | |
49 | ||
50 | /** | |
51 | * relaxed_state_ok - is a requested lock compatible with the current lock mode? | |
52 | * @actual: the current state of the lock | |
53 | * @requested: the lock state that was requested by the caller | |
54 | * @flags: the modifier flags passed in by the caller | |
55 | * | |
56 | * Returns: 1 if the locks are compatible, 0 otherwise | |
57 | */ | |
58 | ||
59 | static inline int relaxed_state_ok(unsigned int actual, unsigned requested, | |
60 | int flags) | |
61 | { | |
62 | if (actual == requested) | |
63 | return 1; | |
64 | ||
65 | if (flags & GL_EXACT) | |
66 | return 0; | |
67 | ||
68 | if (actual == LM_ST_EXCLUSIVE && requested == LM_ST_SHARED) | |
69 | return 1; | |
70 | ||
71 | if (actual != LM_ST_UNLOCKED && (flags & LM_FLAG_ANY)) | |
72 | return 1; | |
73 | ||
74 | return 0; | |
75 | } | |
76 | ||
77 | /** | |
78 | * gl_hash() - Turn glock number into hash bucket number | |
79 | * @lock: The glock number | |
80 | * | |
81 | * Returns: The number of the corresponding hash bucket | |
82 | */ | |
83 | ||
84 | static unsigned int gl_hash(struct lm_lockname *name) | |
85 | { | |
86 | unsigned int h; | |
87 | ||
88 | h = jhash(&name->ln_number, sizeof(uint64_t), 0); | |
89 | h = jhash(&name->ln_type, sizeof(unsigned int), h); | |
90 | h &= GFS2_GL_HASH_MASK; | |
91 | ||
92 | return h; | |
93 | } | |
94 | ||
95 | /** | |
96 | * glock_free() - Perform a few checks and then release struct gfs2_glock | |
97 | * @gl: The glock to release | |
98 | * | |
99 | * Also calls lock module to release its internal structure for this glock. | |
100 | * | |
101 | */ | |
102 | ||
103 | static void glock_free(struct gfs2_glock *gl) | |
104 | { | |
105 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
106 | struct inode *aspace = gl->gl_aspace; | |
107 | ||
108 | gfs2_lm_put_lock(sdp, gl->gl_lock); | |
109 | ||
110 | if (aspace) | |
111 | gfs2_aspace_put(aspace); | |
112 | ||
113 | kmem_cache_free(gfs2_glock_cachep, gl); | |
b3b94faa DT |
114 | } |
115 | ||
116 | /** | |
117 | * gfs2_glock_hold() - increment reference count on glock | |
118 | * @gl: The glock to hold | |
119 | * | |
120 | */ | |
121 | ||
122 | void gfs2_glock_hold(struct gfs2_glock *gl) | |
123 | { | |
124 | kref_get(&gl->gl_ref); | |
125 | } | |
126 | ||
127 | /* All work is done after the return from kref_put() so we | |
128 | can release the write_lock before the free. */ | |
129 | ||
130 | static void kill_glock(struct kref *kref) | |
131 | { | |
132 | struct gfs2_glock *gl = container_of(kref, struct gfs2_glock, gl_ref); | |
133 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
134 | ||
135 | gfs2_assert(sdp, gl->gl_state == LM_ST_UNLOCKED); | |
136 | gfs2_assert(sdp, list_empty(&gl->gl_reclaim)); | |
137 | gfs2_assert(sdp, list_empty(&gl->gl_holders)); | |
138 | gfs2_assert(sdp, list_empty(&gl->gl_waiters1)); | |
139 | gfs2_assert(sdp, list_empty(&gl->gl_waiters2)); | |
140 | gfs2_assert(sdp, list_empty(&gl->gl_waiters3)); | |
141 | } | |
142 | ||
143 | /** | |
144 | * gfs2_glock_put() - Decrement reference count on glock | |
145 | * @gl: The glock to put | |
146 | * | |
147 | */ | |
148 | ||
149 | int gfs2_glock_put(struct gfs2_glock *gl) | |
150 | { | |
151 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
152 | struct gfs2_gl_hash_bucket *bucket = gl->gl_bucket; | |
153 | int rv = 0; | |
154 | ||
f55ab26a | 155 | mutex_lock(&sdp->sd_invalidate_inodes_mutex); |
b3b94faa DT |
156 | |
157 | write_lock(&bucket->hb_lock); | |
158 | if (kref_put(&gl->gl_ref, kill_glock)) { | |
159 | list_del_init(&gl->gl_list); | |
160 | write_unlock(&bucket->hb_lock); | |
190562bd | 161 | BUG_ON(spin_is_locked(&gl->gl_spin)); |
b3b94faa DT |
162 | glock_free(gl); |
163 | rv = 1; | |
164 | goto out; | |
165 | } | |
166 | write_unlock(&bucket->hb_lock); | |
167 | out: | |
f55ab26a | 168 | mutex_unlock(&sdp->sd_invalidate_inodes_mutex); |
b3b94faa DT |
169 | return rv; |
170 | } | |
171 | ||
172 | /** | |
173 | * queue_empty - check to see if a glock's queue is empty | |
174 | * @gl: the glock | |
175 | * @head: the head of the queue to check | |
176 | * | |
177 | * This function protects the list in the event that a process already | |
178 | * has a holder on the list and is adding a second holder for itself. | |
179 | * The glmutex lock is what generally prevents processes from working | |
180 | * on the same glock at once, but the special case of adding a second | |
181 | * holder for yourself ("recursive" locking) doesn't involve locking | |
182 | * glmutex, making the spin lock necessary. | |
183 | * | |
184 | * Returns: 1 if the queue is empty | |
185 | */ | |
186 | ||
187 | static inline int queue_empty(struct gfs2_glock *gl, struct list_head *head) | |
188 | { | |
189 | int empty; | |
190 | spin_lock(&gl->gl_spin); | |
191 | empty = list_empty(head); | |
192 | spin_unlock(&gl->gl_spin); | |
193 | return empty; | |
194 | } | |
195 | ||
196 | /** | |
197 | * search_bucket() - Find struct gfs2_glock by lock number | |
198 | * @bucket: the bucket to search | |
199 | * @name: The lock name | |
200 | * | |
201 | * Returns: NULL, or the struct gfs2_glock with the requested number | |
202 | */ | |
203 | ||
204 | static struct gfs2_glock *search_bucket(struct gfs2_gl_hash_bucket *bucket, | |
205 | struct lm_lockname *name) | |
206 | { | |
207 | struct gfs2_glock *gl; | |
208 | ||
209 | list_for_each_entry(gl, &bucket->hb_list, gl_list) { | |
210 | if (test_bit(GLF_PLUG, &gl->gl_flags)) | |
211 | continue; | |
212 | if (!lm_name_equal(&gl->gl_name, name)) | |
213 | continue; | |
214 | ||
215 | kref_get(&gl->gl_ref); | |
216 | ||
217 | return gl; | |
218 | } | |
219 | ||
220 | return NULL; | |
221 | } | |
222 | ||
223 | /** | |
224 | * gfs2_glock_find() - Find glock by lock number | |
225 | * @sdp: The GFS2 superblock | |
226 | * @name: The lock name | |
227 | * | |
228 | * Returns: NULL, or the struct gfs2_glock with the requested number | |
229 | */ | |
230 | ||
231 | struct gfs2_glock *gfs2_glock_find(struct gfs2_sbd *sdp, | |
232 | struct lm_lockname *name) | |
233 | { | |
234 | struct gfs2_gl_hash_bucket *bucket = &sdp->sd_gl_hash[gl_hash(name)]; | |
235 | struct gfs2_glock *gl; | |
236 | ||
237 | read_lock(&bucket->hb_lock); | |
238 | gl = search_bucket(bucket, name); | |
239 | read_unlock(&bucket->hb_lock); | |
240 | ||
241 | return gl; | |
242 | } | |
243 | ||
244 | /** | |
245 | * gfs2_glock_get() - Get a glock, or create one if one doesn't exist | |
246 | * @sdp: The GFS2 superblock | |
247 | * @number: the lock number | |
248 | * @glops: The glock_operations to use | |
249 | * @create: If 0, don't create the glock if it doesn't exist | |
250 | * @glp: the glock is returned here | |
251 | * | |
252 | * This does not lock a glock, just finds/creates structures for one. | |
253 | * | |
254 | * Returns: errno | |
255 | */ | |
256 | ||
257 | int gfs2_glock_get(struct gfs2_sbd *sdp, uint64_t number, | |
258 | struct gfs2_glock_operations *glops, int create, | |
259 | struct gfs2_glock **glp) | |
260 | { | |
261 | struct lm_lockname name; | |
262 | struct gfs2_glock *gl, *tmp; | |
263 | struct gfs2_gl_hash_bucket *bucket; | |
264 | int error; | |
265 | ||
266 | name.ln_number = number; | |
267 | name.ln_type = glops->go_type; | |
268 | bucket = &sdp->sd_gl_hash[gl_hash(&name)]; | |
269 | ||
270 | read_lock(&bucket->hb_lock); | |
271 | gl = search_bucket(bucket, &name); | |
272 | read_unlock(&bucket->hb_lock); | |
273 | ||
274 | if (gl || !create) { | |
275 | *glp = gl; | |
276 | return 0; | |
277 | } | |
278 | ||
279 | gl = kmem_cache_alloc(gfs2_glock_cachep, GFP_KERNEL); | |
280 | if (!gl) | |
281 | return -ENOMEM; | |
282 | ||
283 | memset(gl, 0, sizeof(struct gfs2_glock)); | |
284 | ||
285 | INIT_LIST_HEAD(&gl->gl_list); | |
286 | gl->gl_name = name; | |
287 | kref_init(&gl->gl_ref); | |
288 | ||
289 | spin_lock_init(&gl->gl_spin); | |
290 | ||
291 | gl->gl_state = LM_ST_UNLOCKED; | |
292 | INIT_LIST_HEAD(&gl->gl_holders); | |
293 | INIT_LIST_HEAD(&gl->gl_waiters1); | |
294 | INIT_LIST_HEAD(&gl->gl_waiters2); | |
295 | INIT_LIST_HEAD(&gl->gl_waiters3); | |
296 | ||
297 | gl->gl_ops = glops; | |
298 | ||
299 | gl->gl_bucket = bucket; | |
300 | INIT_LIST_HEAD(&gl->gl_reclaim); | |
301 | ||
302 | gl->gl_sbd = sdp; | |
303 | ||
304 | lops_init_le(&gl->gl_le, &gfs2_glock_lops); | |
305 | INIT_LIST_HEAD(&gl->gl_ail_list); | |
306 | ||
307 | /* If this glock protects actual on-disk data or metadata blocks, | |
308 | create a VFS inode to manage the pages/buffers holding them. */ | |
309 | if (glops == &gfs2_inode_glops || | |
310 | glops == &gfs2_rgrp_glops || | |
311 | glops == &gfs2_meta_glops) { | |
312 | gl->gl_aspace = gfs2_aspace_get(sdp); | |
313 | if (!gl->gl_aspace) { | |
314 | error = -ENOMEM; | |
315 | goto fail; | |
316 | } | |
317 | } | |
318 | ||
319 | error = gfs2_lm_get_lock(sdp, &name, &gl->gl_lock); | |
320 | if (error) | |
321 | goto fail_aspace; | |
322 | ||
b3b94faa DT |
323 | write_lock(&bucket->hb_lock); |
324 | tmp = search_bucket(bucket, &name); | |
325 | if (tmp) { | |
326 | write_unlock(&bucket->hb_lock); | |
327 | glock_free(gl); | |
328 | gl = tmp; | |
329 | } else { | |
330 | list_add_tail(&gl->gl_list, &bucket->hb_list); | |
331 | write_unlock(&bucket->hb_lock); | |
332 | } | |
333 | ||
334 | *glp = gl; | |
335 | ||
336 | return 0; | |
337 | ||
338 | fail_aspace: | |
339 | if (gl->gl_aspace) | |
340 | gfs2_aspace_put(gl->gl_aspace); | |
341 | ||
342 | fail: | |
343 | kmem_cache_free(gfs2_glock_cachep, gl); | |
344 | ||
345 | return error; | |
346 | } | |
347 | ||
348 | /** | |
349 | * gfs2_holder_init - initialize a struct gfs2_holder in the default way | |
350 | * @gl: the glock | |
351 | * @state: the state we're requesting | |
352 | * @flags: the modifier flags | |
353 | * @gh: the holder structure | |
354 | * | |
355 | */ | |
356 | ||
190562bd | 357 | void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags, |
b3b94faa DT |
358 | struct gfs2_holder *gh) |
359 | { | |
360 | INIT_LIST_HEAD(&gh->gh_list); | |
361 | gh->gh_gl = gl; | |
d0dc80db | 362 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
190562bd | 363 | gh->gh_owner = current; |
b3b94faa DT |
364 | gh->gh_state = state; |
365 | gh->gh_flags = flags; | |
366 | gh->gh_error = 0; | |
367 | gh->gh_iflags = 0; | |
368 | init_completion(&gh->gh_wait); | |
369 | ||
370 | if (gh->gh_state == LM_ST_EXCLUSIVE) | |
371 | gh->gh_flags |= GL_LOCAL_EXCL; | |
372 | ||
373 | gfs2_glock_hold(gl); | |
374 | } | |
375 | ||
376 | /** | |
377 | * gfs2_holder_reinit - reinitialize a struct gfs2_holder so we can requeue it | |
378 | * @state: the state we're requesting | |
379 | * @flags: the modifier flags | |
380 | * @gh: the holder structure | |
381 | * | |
382 | * Don't mess with the glock. | |
383 | * | |
384 | */ | |
385 | ||
190562bd | 386 | void gfs2_holder_reinit(unsigned int state, unsigned flags, struct gfs2_holder *gh) |
b3b94faa DT |
387 | { |
388 | gh->gh_state = state; | |
579b78a4 | 389 | gh->gh_flags = flags; |
b3b94faa DT |
390 | if (gh->gh_state == LM_ST_EXCLUSIVE) |
391 | gh->gh_flags |= GL_LOCAL_EXCL; | |
392 | ||
393 | gh->gh_iflags &= 1 << HIF_ALLOCED; | |
d0dc80db | 394 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
b3b94faa DT |
395 | } |
396 | ||
397 | /** | |
398 | * gfs2_holder_uninit - uninitialize a holder structure (drop glock reference) | |
399 | * @gh: the holder structure | |
400 | * | |
401 | */ | |
402 | ||
403 | void gfs2_holder_uninit(struct gfs2_holder *gh) | |
404 | { | |
405 | gfs2_glock_put(gh->gh_gl); | |
406 | gh->gh_gl = NULL; | |
d0dc80db | 407 | gh->gh_ip = 0; |
b3b94faa DT |
408 | } |
409 | ||
410 | /** | |
411 | * gfs2_holder_get - get a struct gfs2_holder structure | |
412 | * @gl: the glock | |
413 | * @state: the state we're requesting | |
414 | * @flags: the modifier flags | |
415 | * @gfp_flags: __GFP_NOFAIL | |
416 | * | |
417 | * Figure out how big an impact this function has. Either: | |
418 | * 1) Replace it with a cache of structures hanging off the struct gfs2_sbd | |
419 | * 2) Leave it like it is | |
420 | * | |
421 | * Returns: the holder structure, NULL on ENOMEM | |
422 | */ | |
423 | ||
424 | struct gfs2_holder *gfs2_holder_get(struct gfs2_glock *gl, unsigned int state, | |
425 | int flags, gfp_t gfp_flags) | |
426 | { | |
427 | struct gfs2_holder *gh; | |
428 | ||
429 | gh = kmalloc(sizeof(struct gfs2_holder), gfp_flags); | |
430 | if (!gh) | |
431 | return NULL; | |
432 | ||
433 | gfs2_holder_init(gl, state, flags, gh); | |
434 | set_bit(HIF_ALLOCED, &gh->gh_iflags); | |
d0dc80db | 435 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
b3b94faa DT |
436 | return gh; |
437 | } | |
438 | ||
439 | /** | |
440 | * gfs2_holder_put - get rid of a struct gfs2_holder structure | |
441 | * @gh: the holder structure | |
442 | * | |
443 | */ | |
444 | ||
445 | void gfs2_holder_put(struct gfs2_holder *gh) | |
446 | { | |
447 | gfs2_holder_uninit(gh); | |
448 | kfree(gh); | |
449 | } | |
450 | ||
b3b94faa DT |
451 | /** |
452 | * rq_mutex - process a mutex request in the queue | |
453 | * @gh: the glock holder | |
454 | * | |
455 | * Returns: 1 if the queue is blocked | |
456 | */ | |
457 | ||
458 | static int rq_mutex(struct gfs2_holder *gh) | |
459 | { | |
460 | struct gfs2_glock *gl = gh->gh_gl; | |
461 | ||
462 | list_del_init(&gh->gh_list); | |
463 | /* gh->gh_error never examined. */ | |
464 | set_bit(GLF_LOCK, &gl->gl_flags); | |
465 | complete(&gh->gh_wait); | |
466 | ||
467 | return 1; | |
468 | } | |
469 | ||
470 | /** | |
471 | * rq_promote - process a promote request in the queue | |
472 | * @gh: the glock holder | |
473 | * | |
474 | * Acquire a new inter-node lock, or change a lock state to more restrictive. | |
475 | * | |
476 | * Returns: 1 if the queue is blocked | |
477 | */ | |
478 | ||
479 | static int rq_promote(struct gfs2_holder *gh) | |
480 | { | |
481 | struct gfs2_glock *gl = gh->gh_gl; | |
482 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
483 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
b3b94faa DT |
484 | |
485 | if (!relaxed_state_ok(gl->gl_state, gh->gh_state, gh->gh_flags)) { | |
486 | if (list_empty(&gl->gl_holders)) { | |
487 | gl->gl_req_gh = gh; | |
488 | set_bit(GLF_LOCK, &gl->gl_flags); | |
489 | spin_unlock(&gl->gl_spin); | |
490 | ||
491 | if (atomic_read(&sdp->sd_reclaim_count) > | |
492 | gfs2_tune_get(sdp, gt_reclaim_limit) && | |
493 | !(gh->gh_flags & LM_FLAG_PRIORITY)) { | |
494 | gfs2_reclaim_glock(sdp); | |
495 | gfs2_reclaim_glock(sdp); | |
496 | } | |
497 | ||
498 | glops->go_xmote_th(gl, gh->gh_state, | |
499 | gh->gh_flags); | |
500 | ||
501 | spin_lock(&gl->gl_spin); | |
502 | } | |
503 | return 1; | |
504 | } | |
505 | ||
506 | if (list_empty(&gl->gl_holders)) { | |
507 | set_bit(HIF_FIRST, &gh->gh_iflags); | |
508 | set_bit(GLF_LOCK, &gl->gl_flags); | |
b3b94faa DT |
509 | } else { |
510 | struct gfs2_holder *next_gh; | |
511 | if (gh->gh_flags & GL_LOCAL_EXCL) | |
512 | return 1; | |
513 | next_gh = list_entry(gl->gl_holders.next, struct gfs2_holder, | |
514 | gh_list); | |
515 | if (next_gh->gh_flags & GL_LOCAL_EXCL) | |
516 | return 1; | |
b3b94faa DT |
517 | } |
518 | ||
519 | list_move_tail(&gh->gh_list, &gl->gl_holders); | |
520 | gh->gh_error = 0; | |
521 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
522 | ||
b3b94faa DT |
523 | complete(&gh->gh_wait); |
524 | ||
525 | return 0; | |
526 | } | |
527 | ||
528 | /** | |
529 | * rq_demote - process a demote request in the queue | |
530 | * @gh: the glock holder | |
531 | * | |
532 | * Returns: 1 if the queue is blocked | |
533 | */ | |
534 | ||
535 | static int rq_demote(struct gfs2_holder *gh) | |
536 | { | |
537 | struct gfs2_glock *gl = gh->gh_gl; | |
538 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
539 | ||
540 | if (!list_empty(&gl->gl_holders)) | |
541 | return 1; | |
542 | ||
543 | if (gl->gl_state == gh->gh_state || gl->gl_state == LM_ST_UNLOCKED) { | |
544 | list_del_init(&gh->gh_list); | |
545 | gh->gh_error = 0; | |
546 | spin_unlock(&gl->gl_spin); | |
547 | if (test_bit(HIF_DEALLOC, &gh->gh_iflags)) | |
548 | gfs2_holder_put(gh); | |
549 | else | |
550 | complete(&gh->gh_wait); | |
551 | spin_lock(&gl->gl_spin); | |
552 | } else { | |
553 | gl->gl_req_gh = gh; | |
554 | set_bit(GLF_LOCK, &gl->gl_flags); | |
555 | spin_unlock(&gl->gl_spin); | |
556 | ||
557 | if (gh->gh_state == LM_ST_UNLOCKED || | |
558 | gl->gl_state != LM_ST_EXCLUSIVE) | |
559 | glops->go_drop_th(gl); | |
560 | else | |
561 | glops->go_xmote_th(gl, gh->gh_state, gh->gh_flags); | |
562 | ||
563 | spin_lock(&gl->gl_spin); | |
564 | } | |
565 | ||
566 | return 0; | |
567 | } | |
568 | ||
569 | /** | |
570 | * rq_greedy - process a queued request to drop greedy status | |
571 | * @gh: the glock holder | |
572 | * | |
573 | * Returns: 1 if the queue is blocked | |
574 | */ | |
575 | ||
576 | static int rq_greedy(struct gfs2_holder *gh) | |
577 | { | |
578 | struct gfs2_glock *gl = gh->gh_gl; | |
579 | ||
580 | list_del_init(&gh->gh_list); | |
581 | /* gh->gh_error never examined. */ | |
582 | clear_bit(GLF_GREEDY, &gl->gl_flags); | |
583 | spin_unlock(&gl->gl_spin); | |
584 | ||
585 | gfs2_holder_uninit(gh); | |
586 | kfree(container_of(gh, struct greedy, gr_gh)); | |
587 | ||
588 | spin_lock(&gl->gl_spin); | |
589 | ||
590 | return 0; | |
591 | } | |
592 | ||
593 | /** | |
594 | * run_queue - process holder structures on a glock | |
595 | * @gl: the glock | |
596 | * | |
597 | */ | |
b3b94faa DT |
598 | static void run_queue(struct gfs2_glock *gl) |
599 | { | |
600 | struct gfs2_holder *gh; | |
601 | int blocked = 1; | |
602 | ||
603 | for (;;) { | |
604 | if (test_bit(GLF_LOCK, &gl->gl_flags)) | |
605 | break; | |
606 | ||
607 | if (!list_empty(&gl->gl_waiters1)) { | |
608 | gh = list_entry(gl->gl_waiters1.next, | |
609 | struct gfs2_holder, gh_list); | |
610 | ||
611 | if (test_bit(HIF_MUTEX, &gh->gh_iflags)) | |
612 | blocked = rq_mutex(gh); | |
613 | else | |
614 | gfs2_assert_warn(gl->gl_sbd, 0); | |
615 | ||
616 | } else if (!list_empty(&gl->gl_waiters2) && | |
617 | !test_bit(GLF_SKIP_WAITERS2, &gl->gl_flags)) { | |
618 | gh = list_entry(gl->gl_waiters2.next, | |
619 | struct gfs2_holder, gh_list); | |
620 | ||
621 | if (test_bit(HIF_DEMOTE, &gh->gh_iflags)) | |
622 | blocked = rq_demote(gh); | |
623 | else if (test_bit(HIF_GREEDY, &gh->gh_iflags)) | |
624 | blocked = rq_greedy(gh); | |
625 | else | |
626 | gfs2_assert_warn(gl->gl_sbd, 0); | |
627 | ||
628 | } else if (!list_empty(&gl->gl_waiters3)) { | |
629 | gh = list_entry(gl->gl_waiters3.next, | |
630 | struct gfs2_holder, gh_list); | |
631 | ||
632 | if (test_bit(HIF_PROMOTE, &gh->gh_iflags)) | |
633 | blocked = rq_promote(gh); | |
634 | else | |
635 | gfs2_assert_warn(gl->gl_sbd, 0); | |
636 | ||
637 | } else | |
638 | break; | |
639 | ||
640 | if (blocked) | |
641 | break; | |
642 | } | |
643 | } | |
644 | ||
645 | /** | |
646 | * gfs2_glmutex_lock - acquire a local lock on a glock | |
647 | * @gl: the glock | |
648 | * | |
649 | * Gives caller exclusive access to manipulate a glock structure. | |
650 | */ | |
651 | ||
652 | void gfs2_glmutex_lock(struct gfs2_glock *gl) | |
653 | { | |
654 | struct gfs2_holder gh; | |
655 | ||
656 | gfs2_holder_init(gl, 0, 0, &gh); | |
657 | set_bit(HIF_MUTEX, &gh.gh_iflags); | |
658 | ||
659 | spin_lock(&gl->gl_spin); | |
660 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) | |
661 | list_add_tail(&gh.gh_list, &gl->gl_waiters1); | |
662 | else | |
663 | complete(&gh.gh_wait); | |
664 | spin_unlock(&gl->gl_spin); | |
665 | ||
666 | wait_for_completion(&gh.gh_wait); | |
667 | gfs2_holder_uninit(&gh); | |
668 | } | |
669 | ||
670 | /** | |
671 | * gfs2_glmutex_trylock - try to acquire a local lock on a glock | |
672 | * @gl: the glock | |
673 | * | |
674 | * Returns: 1 if the glock is acquired | |
675 | */ | |
676 | ||
677 | int gfs2_glmutex_trylock(struct gfs2_glock *gl) | |
678 | { | |
679 | int acquired = 1; | |
680 | ||
681 | spin_lock(&gl->gl_spin); | |
682 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) | |
683 | acquired = 0; | |
684 | spin_unlock(&gl->gl_spin); | |
685 | ||
686 | return acquired; | |
687 | } | |
688 | ||
689 | /** | |
690 | * gfs2_glmutex_unlock - release a local lock on a glock | |
691 | * @gl: the glock | |
692 | * | |
693 | */ | |
694 | ||
695 | void gfs2_glmutex_unlock(struct gfs2_glock *gl) | |
696 | { | |
697 | spin_lock(&gl->gl_spin); | |
698 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
699 | run_queue(gl); | |
190562bd | 700 | BUG_ON(!spin_is_locked(&gl->gl_spin)); |
b3b94faa DT |
701 | spin_unlock(&gl->gl_spin); |
702 | } | |
703 | ||
704 | /** | |
705 | * handle_callback - add a demote request to a lock's queue | |
706 | * @gl: the glock | |
707 | * @state: the state the caller wants us to change to | |
708 | * | |
709 | */ | |
710 | ||
711 | static void handle_callback(struct gfs2_glock *gl, unsigned int state) | |
712 | { | |
713 | struct gfs2_holder *gh, *new_gh = NULL; | |
714 | ||
715 | restart: | |
716 | spin_lock(&gl->gl_spin); | |
717 | ||
718 | list_for_each_entry(gh, &gl->gl_waiters2, gh_list) { | |
719 | if (test_bit(HIF_DEMOTE, &gh->gh_iflags) && | |
720 | gl->gl_req_gh != gh) { | |
721 | if (gh->gh_state != state) | |
722 | gh->gh_state = LM_ST_UNLOCKED; | |
723 | goto out; | |
724 | } | |
725 | } | |
726 | ||
727 | if (new_gh) { | |
728 | list_add_tail(&new_gh->gh_list, &gl->gl_waiters2); | |
729 | new_gh = NULL; | |
730 | } else { | |
731 | spin_unlock(&gl->gl_spin); | |
732 | ||
579b78a4 | 733 | new_gh = gfs2_holder_get(gl, state, LM_FLAG_TRY, |
b3b94faa DT |
734 | GFP_KERNEL | __GFP_NOFAIL), |
735 | set_bit(HIF_DEMOTE, &new_gh->gh_iflags); | |
736 | set_bit(HIF_DEALLOC, &new_gh->gh_iflags); | |
737 | ||
738 | goto restart; | |
739 | } | |
740 | ||
741 | out: | |
742 | spin_unlock(&gl->gl_spin); | |
743 | ||
744 | if (new_gh) | |
745 | gfs2_holder_put(new_gh); | |
746 | } | |
747 | ||
748 | /** | |
749 | * state_change - record that the glock is now in a different state | |
750 | * @gl: the glock | |
751 | * @new_state the new state | |
752 | * | |
753 | */ | |
754 | ||
755 | static void state_change(struct gfs2_glock *gl, unsigned int new_state) | |
756 | { | |
b3b94faa DT |
757 | int held1, held2; |
758 | ||
759 | held1 = (gl->gl_state != LM_ST_UNLOCKED); | |
760 | held2 = (new_state != LM_ST_UNLOCKED); | |
761 | ||
762 | if (held1 != held2) { | |
6a6b3d01 | 763 | if (held2) |
b3b94faa | 764 | gfs2_glock_hold(gl); |
6a6b3d01 | 765 | else |
b3b94faa | 766 | gfs2_glock_put(gl); |
b3b94faa DT |
767 | } |
768 | ||
769 | gl->gl_state = new_state; | |
770 | } | |
771 | ||
772 | /** | |
773 | * xmote_bh - Called after the lock module is done acquiring a lock | |
774 | * @gl: The glock in question | |
775 | * @ret: the int returned from the lock module | |
776 | * | |
777 | */ | |
778 | ||
779 | static void xmote_bh(struct gfs2_glock *gl, unsigned int ret) | |
780 | { | |
781 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
782 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
783 | struct gfs2_holder *gh = gl->gl_req_gh; | |
784 | int prev_state = gl->gl_state; | |
785 | int op_done = 1; | |
786 | ||
787 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
788 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
789 | gfs2_assert_warn(sdp, !(ret & LM_OUT_ASYNC)); | |
790 | ||
791 | state_change(gl, ret & LM_OUT_ST_MASK); | |
792 | ||
793 | if (prev_state != LM_ST_UNLOCKED && !(ret & LM_OUT_CACHEABLE)) { | |
794 | if (glops->go_inval) | |
795 | glops->go_inval(gl, DIO_METADATA | DIO_DATA); | |
796 | } else if (gl->gl_state == LM_ST_DEFERRED) { | |
797 | /* We might not want to do this here. | |
798 | Look at moving to the inode glops. */ | |
799 | if (glops->go_inval) | |
800 | glops->go_inval(gl, DIO_DATA); | |
801 | } | |
802 | ||
803 | /* Deal with each possible exit condition */ | |
804 | ||
805 | if (!gh) | |
806 | gl->gl_stamp = jiffies; | |
807 | ||
808 | else if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) { | |
809 | spin_lock(&gl->gl_spin); | |
810 | list_del_init(&gh->gh_list); | |
811 | gh->gh_error = -EIO; | |
b3b94faa DT |
812 | spin_unlock(&gl->gl_spin); |
813 | ||
814 | } else if (test_bit(HIF_DEMOTE, &gh->gh_iflags)) { | |
815 | spin_lock(&gl->gl_spin); | |
816 | list_del_init(&gh->gh_list); | |
817 | if (gl->gl_state == gh->gh_state || | |
818 | gl->gl_state == LM_ST_UNLOCKED) | |
819 | gh->gh_error = 0; | |
820 | else { | |
821 | if (gfs2_assert_warn(sdp, gh->gh_flags & | |
822 | (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) == -1) | |
823 | fs_warn(sdp, "ret = 0x%.8X\n", ret); | |
824 | gh->gh_error = GLR_TRYFAILED; | |
825 | } | |
826 | spin_unlock(&gl->gl_spin); | |
827 | ||
828 | if (ret & LM_OUT_CANCELED) | |
829 | handle_callback(gl, LM_ST_UNLOCKED); /* Lame */ | |
830 | ||
831 | } else if (ret & LM_OUT_CANCELED) { | |
832 | spin_lock(&gl->gl_spin); | |
833 | list_del_init(&gh->gh_list); | |
834 | gh->gh_error = GLR_CANCELED; | |
b3b94faa DT |
835 | spin_unlock(&gl->gl_spin); |
836 | ||
837 | } else if (relaxed_state_ok(gl->gl_state, gh->gh_state, gh->gh_flags)) { | |
838 | spin_lock(&gl->gl_spin); | |
839 | list_move_tail(&gh->gh_list, &gl->gl_holders); | |
840 | gh->gh_error = 0; | |
841 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
842 | spin_unlock(&gl->gl_spin); | |
843 | ||
844 | set_bit(HIF_FIRST, &gh->gh_iflags); | |
845 | ||
846 | op_done = 0; | |
847 | ||
848 | } else if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { | |
849 | spin_lock(&gl->gl_spin); | |
850 | list_del_init(&gh->gh_list); | |
851 | gh->gh_error = GLR_TRYFAILED; | |
b3b94faa DT |
852 | spin_unlock(&gl->gl_spin); |
853 | ||
854 | } else { | |
855 | if (gfs2_assert_withdraw(sdp, 0) == -1) | |
856 | fs_err(sdp, "ret = 0x%.8X\n", ret); | |
857 | } | |
858 | ||
859 | if (glops->go_xmote_bh) | |
860 | glops->go_xmote_bh(gl); | |
861 | ||
862 | if (op_done) { | |
863 | spin_lock(&gl->gl_spin); | |
864 | gl->gl_req_gh = NULL; | |
865 | gl->gl_req_bh = NULL; | |
866 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
867 | run_queue(gl); | |
868 | spin_unlock(&gl->gl_spin); | |
869 | } | |
870 | ||
871 | gfs2_glock_put(gl); | |
872 | ||
873 | if (gh) { | |
874 | if (test_bit(HIF_DEALLOC, &gh->gh_iflags)) | |
875 | gfs2_holder_put(gh); | |
876 | else | |
877 | complete(&gh->gh_wait); | |
878 | } | |
879 | } | |
880 | ||
881 | /** | |
882 | * gfs2_glock_xmote_th - Call into the lock module to acquire or change a glock | |
883 | * @gl: The glock in question | |
884 | * @state: the requested state | |
885 | * @flags: modifier flags to the lock call | |
886 | * | |
887 | */ | |
888 | ||
889 | void gfs2_glock_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags) | |
890 | { | |
891 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
892 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
893 | int lck_flags = flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB | | |
894 | LM_FLAG_NOEXP | LM_FLAG_ANY | | |
895 | LM_FLAG_PRIORITY); | |
896 | unsigned int lck_ret; | |
897 | ||
898 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
899 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
900 | gfs2_assert_warn(sdp, state != LM_ST_UNLOCKED); | |
901 | gfs2_assert_warn(sdp, state != gl->gl_state); | |
902 | ||
903 | if (gl->gl_state == LM_ST_EXCLUSIVE) { | |
904 | if (glops->go_sync) | |
905 | glops->go_sync(gl, | |
906 | DIO_METADATA | DIO_DATA | DIO_RELEASE); | |
907 | } | |
908 | ||
909 | gfs2_glock_hold(gl); | |
910 | gl->gl_req_bh = xmote_bh; | |
911 | ||
b3b94faa DT |
912 | lck_ret = gfs2_lm_lock(sdp, gl->gl_lock, gl->gl_state, state, |
913 | lck_flags); | |
914 | ||
915 | if (gfs2_assert_withdraw(sdp, !(lck_ret & LM_OUT_ERROR))) | |
916 | return; | |
917 | ||
918 | if (lck_ret & LM_OUT_ASYNC) | |
919 | gfs2_assert_warn(sdp, lck_ret == LM_OUT_ASYNC); | |
920 | else | |
921 | xmote_bh(gl, lck_ret); | |
922 | } | |
923 | ||
924 | /** | |
925 | * drop_bh - Called after a lock module unlock completes | |
926 | * @gl: the glock | |
927 | * @ret: the return status | |
928 | * | |
929 | * Doesn't wake up the process waiting on the struct gfs2_holder (if any) | |
930 | * Doesn't drop the reference on the glock the top half took out | |
931 | * | |
932 | */ | |
933 | ||
934 | static void drop_bh(struct gfs2_glock *gl, unsigned int ret) | |
935 | { | |
936 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
937 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
938 | struct gfs2_holder *gh = gl->gl_req_gh; | |
939 | ||
940 | clear_bit(GLF_PREFETCH, &gl->gl_flags); | |
941 | ||
942 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
943 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
944 | gfs2_assert_warn(sdp, !ret); | |
945 | ||
946 | state_change(gl, LM_ST_UNLOCKED); | |
947 | ||
948 | if (glops->go_inval) | |
949 | glops->go_inval(gl, DIO_METADATA | DIO_DATA); | |
950 | ||
951 | if (gh) { | |
952 | spin_lock(&gl->gl_spin); | |
953 | list_del_init(&gh->gh_list); | |
954 | gh->gh_error = 0; | |
955 | spin_unlock(&gl->gl_spin); | |
956 | } | |
957 | ||
958 | if (glops->go_drop_bh) | |
959 | glops->go_drop_bh(gl); | |
960 | ||
961 | spin_lock(&gl->gl_spin); | |
962 | gl->gl_req_gh = NULL; | |
963 | gl->gl_req_bh = NULL; | |
964 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
965 | run_queue(gl); | |
966 | spin_unlock(&gl->gl_spin); | |
967 | ||
968 | gfs2_glock_put(gl); | |
969 | ||
970 | if (gh) { | |
971 | if (test_bit(HIF_DEALLOC, &gh->gh_iflags)) | |
972 | gfs2_holder_put(gh); | |
973 | else | |
974 | complete(&gh->gh_wait); | |
975 | } | |
976 | } | |
977 | ||
978 | /** | |
979 | * gfs2_glock_drop_th - call into the lock module to unlock a lock | |
980 | * @gl: the glock | |
981 | * | |
982 | */ | |
983 | ||
984 | void gfs2_glock_drop_th(struct gfs2_glock *gl) | |
985 | { | |
986 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
987 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
988 | unsigned int ret; | |
989 | ||
990 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
991 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
992 | gfs2_assert_warn(sdp, gl->gl_state != LM_ST_UNLOCKED); | |
993 | ||
994 | if (gl->gl_state == LM_ST_EXCLUSIVE) { | |
995 | if (glops->go_sync) | |
996 | glops->go_sync(gl, | |
997 | DIO_METADATA | DIO_DATA | DIO_RELEASE); | |
998 | } | |
999 | ||
1000 | gfs2_glock_hold(gl); | |
1001 | gl->gl_req_bh = drop_bh; | |
1002 | ||
b3b94faa DT |
1003 | ret = gfs2_lm_unlock(sdp, gl->gl_lock, gl->gl_state); |
1004 | ||
1005 | if (gfs2_assert_withdraw(sdp, !(ret & LM_OUT_ERROR))) | |
1006 | return; | |
1007 | ||
1008 | if (!ret) | |
1009 | drop_bh(gl, ret); | |
1010 | else | |
1011 | gfs2_assert_warn(sdp, ret == LM_OUT_ASYNC); | |
1012 | } | |
1013 | ||
1014 | /** | |
1015 | * do_cancels - cancel requests for locks stuck waiting on an expire flag | |
1016 | * @gh: the LM_FLAG_PRIORITY holder waiting to acquire the lock | |
1017 | * | |
1018 | * Don't cancel GL_NOCANCEL requests. | |
1019 | */ | |
1020 | ||
1021 | static void do_cancels(struct gfs2_holder *gh) | |
1022 | { | |
1023 | struct gfs2_glock *gl = gh->gh_gl; | |
1024 | ||
1025 | spin_lock(&gl->gl_spin); | |
1026 | ||
1027 | while (gl->gl_req_gh != gh && | |
1028 | !test_bit(HIF_HOLDER, &gh->gh_iflags) && | |
1029 | !list_empty(&gh->gh_list)) { | |
1030 | if (gl->gl_req_bh && | |
1031 | !(gl->gl_req_gh && | |
1032 | (gl->gl_req_gh->gh_flags & GL_NOCANCEL))) { | |
1033 | spin_unlock(&gl->gl_spin); | |
1034 | gfs2_lm_cancel(gl->gl_sbd, gl->gl_lock); | |
1035 | msleep(100); | |
1036 | spin_lock(&gl->gl_spin); | |
1037 | } else { | |
1038 | spin_unlock(&gl->gl_spin); | |
1039 | msleep(100); | |
1040 | spin_lock(&gl->gl_spin); | |
1041 | } | |
1042 | } | |
1043 | ||
1044 | spin_unlock(&gl->gl_spin); | |
1045 | } | |
1046 | ||
1047 | /** | |
1048 | * glock_wait_internal - wait on a glock acquisition | |
1049 | * @gh: the glock holder | |
1050 | * | |
1051 | * Returns: 0 on success | |
1052 | */ | |
1053 | ||
1054 | static int glock_wait_internal(struct gfs2_holder *gh) | |
1055 | { | |
1056 | struct gfs2_glock *gl = gh->gh_gl; | |
1057 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1058 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
1059 | ||
1060 | if (test_bit(HIF_ABORTED, &gh->gh_iflags)) | |
1061 | return -EIO; | |
1062 | ||
1063 | if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { | |
1064 | spin_lock(&gl->gl_spin); | |
1065 | if (gl->gl_req_gh != gh && | |
1066 | !test_bit(HIF_HOLDER, &gh->gh_iflags) && | |
1067 | !list_empty(&gh->gh_list)) { | |
1068 | list_del_init(&gh->gh_list); | |
1069 | gh->gh_error = GLR_TRYFAILED; | |
b3b94faa DT |
1070 | run_queue(gl); |
1071 | spin_unlock(&gl->gl_spin); | |
1072 | return gh->gh_error; | |
1073 | } | |
1074 | spin_unlock(&gl->gl_spin); | |
1075 | } | |
1076 | ||
1077 | if (gh->gh_flags & LM_FLAG_PRIORITY) | |
1078 | do_cancels(gh); | |
1079 | ||
1080 | wait_for_completion(&gh->gh_wait); | |
1081 | ||
1082 | if (gh->gh_error) | |
1083 | return gh->gh_error; | |
1084 | ||
1085 | gfs2_assert_withdraw(sdp, test_bit(HIF_HOLDER, &gh->gh_iflags)); | |
1086 | gfs2_assert_withdraw(sdp, relaxed_state_ok(gl->gl_state, | |
1087 | gh->gh_state, | |
1088 | gh->gh_flags)); | |
1089 | ||
1090 | if (test_bit(HIF_FIRST, &gh->gh_iflags)) { | |
1091 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
1092 | ||
1093 | if (glops->go_lock) { | |
1094 | gh->gh_error = glops->go_lock(gh); | |
1095 | if (gh->gh_error) { | |
1096 | spin_lock(&gl->gl_spin); | |
1097 | list_del_init(&gh->gh_list); | |
b3b94faa DT |
1098 | spin_unlock(&gl->gl_spin); |
1099 | } | |
1100 | } | |
1101 | ||
1102 | spin_lock(&gl->gl_spin); | |
1103 | gl->gl_req_gh = NULL; | |
1104 | gl->gl_req_bh = NULL; | |
1105 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
b3b94faa DT |
1106 | run_queue(gl); |
1107 | spin_unlock(&gl->gl_spin); | |
1108 | } | |
1109 | ||
1110 | return gh->gh_error; | |
1111 | } | |
1112 | ||
1113 | static inline struct gfs2_holder * | |
1114 | find_holder_by_owner(struct list_head *head, struct task_struct *owner) | |
1115 | { | |
1116 | struct gfs2_holder *gh; | |
1117 | ||
1118 | list_for_each_entry(gh, head, gh_list) { | |
1119 | if (gh->gh_owner == owner) | |
1120 | return gh; | |
1121 | } | |
1122 | ||
1123 | return NULL; | |
1124 | } | |
1125 | ||
b3b94faa DT |
1126 | /** |
1127 | * add_to_queue - Add a holder to the wait queue (but look for recursion) | |
1128 | * @gh: the holder structure to add | |
1129 | * | |
1130 | */ | |
1131 | ||
1132 | static void add_to_queue(struct gfs2_holder *gh) | |
1133 | { | |
1134 | struct gfs2_glock *gl = gh->gh_gl; | |
1135 | struct gfs2_holder *existing; | |
1136 | ||
190562bd SW |
1137 | BUG_ON(!gh->gh_owner); |
1138 | ||
b3b94faa DT |
1139 | existing = find_holder_by_owner(&gl->gl_holders, gh->gh_owner); |
1140 | if (existing) { | |
5965b1f4 SW |
1141 | print_symbol(KERN_WARNING "original: %s\n", existing->gh_ip); |
1142 | print_symbol(KERN_WARNING "new: %s\n", gh->gh_ip); | |
1143 | BUG(); | |
b3b94faa DT |
1144 | } |
1145 | ||
1146 | existing = find_holder_by_owner(&gl->gl_waiters3, gh->gh_owner); | |
1147 | if (existing) { | |
5965b1f4 SW |
1148 | print_symbol(KERN_WARNING "original: %s\n", existing->gh_ip); |
1149 | print_symbol(KERN_WARNING "new: %s\n", gh->gh_ip); | |
1150 | BUG(); | |
b3b94faa DT |
1151 | } |
1152 | ||
b3b94faa DT |
1153 | if (gh->gh_flags & LM_FLAG_PRIORITY) |
1154 | list_add(&gh->gh_list, &gl->gl_waiters3); | |
1155 | else | |
1156 | list_add_tail(&gh->gh_list, &gl->gl_waiters3); | |
1157 | } | |
1158 | ||
1159 | /** | |
1160 | * gfs2_glock_nq - enqueue a struct gfs2_holder onto a glock (acquire a glock) | |
1161 | * @gh: the holder structure | |
1162 | * | |
1163 | * if (gh->gh_flags & GL_ASYNC), this never returns an error | |
1164 | * | |
1165 | * Returns: 0, GLR_TRYFAILED, or errno on failure | |
1166 | */ | |
1167 | ||
1168 | int gfs2_glock_nq(struct gfs2_holder *gh) | |
1169 | { | |
1170 | struct gfs2_glock *gl = gh->gh_gl; | |
1171 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1172 | int error = 0; | |
1173 | ||
b3b94faa DT |
1174 | restart: |
1175 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) { | |
1176 | set_bit(HIF_ABORTED, &gh->gh_iflags); | |
1177 | return -EIO; | |
1178 | } | |
1179 | ||
1180 | set_bit(HIF_PROMOTE, &gh->gh_iflags); | |
1181 | ||
1182 | spin_lock(&gl->gl_spin); | |
1183 | add_to_queue(gh); | |
1184 | run_queue(gl); | |
1185 | spin_unlock(&gl->gl_spin); | |
1186 | ||
1187 | if (!(gh->gh_flags & GL_ASYNC)) { | |
1188 | error = glock_wait_internal(gh); | |
1189 | if (error == GLR_CANCELED) { | |
190562bd | 1190 | msleep(100); |
b3b94faa DT |
1191 | goto restart; |
1192 | } | |
1193 | } | |
1194 | ||
1195 | clear_bit(GLF_PREFETCH, &gl->gl_flags); | |
1196 | ||
1197 | return error; | |
1198 | } | |
1199 | ||
1200 | /** | |
1201 | * gfs2_glock_poll - poll to see if an async request has been completed | |
1202 | * @gh: the holder | |
1203 | * | |
1204 | * Returns: 1 if the request is ready to be gfs2_glock_wait()ed on | |
1205 | */ | |
1206 | ||
1207 | int gfs2_glock_poll(struct gfs2_holder *gh) | |
1208 | { | |
1209 | struct gfs2_glock *gl = gh->gh_gl; | |
1210 | int ready = 0; | |
1211 | ||
1212 | spin_lock(&gl->gl_spin); | |
1213 | ||
1214 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
1215 | ready = 1; | |
1216 | else if (list_empty(&gh->gh_list)) { | |
1217 | if (gh->gh_error == GLR_CANCELED) { | |
1218 | spin_unlock(&gl->gl_spin); | |
190562bd | 1219 | msleep(100); |
b3b94faa DT |
1220 | if (gfs2_glock_nq(gh)) |
1221 | return 1; | |
1222 | return 0; | |
1223 | } else | |
1224 | ready = 1; | |
1225 | } | |
1226 | ||
1227 | spin_unlock(&gl->gl_spin); | |
1228 | ||
1229 | return ready; | |
1230 | } | |
1231 | ||
1232 | /** | |
1233 | * gfs2_glock_wait - wait for a lock acquisition that ended in a GLR_ASYNC | |
1234 | * @gh: the holder structure | |
1235 | * | |
1236 | * Returns: 0, GLR_TRYFAILED, or errno on failure | |
1237 | */ | |
1238 | ||
1239 | int gfs2_glock_wait(struct gfs2_holder *gh) | |
1240 | { | |
1241 | int error; | |
1242 | ||
1243 | error = glock_wait_internal(gh); | |
1244 | if (error == GLR_CANCELED) { | |
190562bd | 1245 | msleep(100); |
b3b94faa DT |
1246 | gh->gh_flags &= ~GL_ASYNC; |
1247 | error = gfs2_glock_nq(gh); | |
1248 | } | |
1249 | ||
1250 | return error; | |
1251 | } | |
1252 | ||
1253 | /** | |
1254 | * gfs2_glock_dq - dequeue a struct gfs2_holder from a glock (release a glock) | |
1255 | * @gh: the glock holder | |
1256 | * | |
1257 | */ | |
1258 | ||
1259 | void gfs2_glock_dq(struct gfs2_holder *gh) | |
1260 | { | |
1261 | struct gfs2_glock *gl = gh->gh_gl; | |
b3b94faa DT |
1262 | struct gfs2_glock_operations *glops = gl->gl_ops; |
1263 | ||
b3b94faa DT |
1264 | if (gh->gh_flags & GL_SYNC) |
1265 | set_bit(GLF_SYNC, &gl->gl_flags); | |
1266 | ||
1267 | if (gh->gh_flags & GL_NOCACHE) | |
1268 | handle_callback(gl, LM_ST_UNLOCKED); | |
1269 | ||
1270 | gfs2_glmutex_lock(gl); | |
1271 | ||
1272 | spin_lock(&gl->gl_spin); | |
1273 | list_del_init(&gh->gh_list); | |
1274 | ||
1275 | if (list_empty(&gl->gl_holders)) { | |
1276 | spin_unlock(&gl->gl_spin); | |
1277 | ||
1278 | if (glops->go_unlock) | |
1279 | glops->go_unlock(gh); | |
1280 | ||
1281 | if (test_bit(GLF_SYNC, &gl->gl_flags)) { | |
1282 | if (glops->go_sync) | |
1283 | glops->go_sync(gl, DIO_METADATA | DIO_DATA); | |
1284 | } | |
1285 | ||
1286 | gl->gl_stamp = jiffies; | |
1287 | ||
1288 | spin_lock(&gl->gl_spin); | |
1289 | } | |
1290 | ||
1291 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
1292 | run_queue(gl); | |
1293 | spin_unlock(&gl->gl_spin); | |
1294 | } | |
1295 | ||
1296 | /** | |
1297 | * gfs2_glock_prefetch - Try to prefetch a glock | |
1298 | * @gl: the glock | |
1299 | * @state: the state to prefetch in | |
1300 | * @flags: flags passed to go_xmote_th() | |
1301 | * | |
1302 | */ | |
1303 | ||
1304 | void gfs2_glock_prefetch(struct gfs2_glock *gl, unsigned int state, int flags) | |
1305 | { | |
1306 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
1307 | ||
1308 | spin_lock(&gl->gl_spin); | |
1309 | ||
1310 | if (test_bit(GLF_LOCK, &gl->gl_flags) || | |
1311 | !list_empty(&gl->gl_holders) || | |
1312 | !list_empty(&gl->gl_waiters1) || | |
1313 | !list_empty(&gl->gl_waiters2) || | |
1314 | !list_empty(&gl->gl_waiters3) || | |
1315 | relaxed_state_ok(gl->gl_state, state, flags)) { | |
1316 | spin_unlock(&gl->gl_spin); | |
1317 | return; | |
1318 | } | |
1319 | ||
1320 | set_bit(GLF_PREFETCH, &gl->gl_flags); | |
1321 | set_bit(GLF_LOCK, &gl->gl_flags); | |
1322 | spin_unlock(&gl->gl_spin); | |
1323 | ||
1324 | glops->go_xmote_th(gl, state, flags); | |
b3b94faa DT |
1325 | } |
1326 | ||
1327 | /** | |
1328 | * gfs2_glock_force_drop - Force a glock to be uncached | |
1329 | * @gl: the glock | |
1330 | * | |
1331 | */ | |
1332 | ||
1333 | void gfs2_glock_force_drop(struct gfs2_glock *gl) | |
1334 | { | |
1335 | struct gfs2_holder gh; | |
1336 | ||
579b78a4 | 1337 | gfs2_holder_init(gl, LM_ST_UNLOCKED, 0, &gh); |
b3b94faa DT |
1338 | set_bit(HIF_DEMOTE, &gh.gh_iflags); |
1339 | ||
1340 | spin_lock(&gl->gl_spin); | |
1341 | list_add_tail(&gh.gh_list, &gl->gl_waiters2); | |
1342 | run_queue(gl); | |
1343 | spin_unlock(&gl->gl_spin); | |
1344 | ||
1345 | wait_for_completion(&gh.gh_wait); | |
1346 | gfs2_holder_uninit(&gh); | |
1347 | } | |
1348 | ||
1349 | static void greedy_work(void *data) | |
1350 | { | |
1351 | struct greedy *gr = (struct greedy *)data; | |
1352 | struct gfs2_holder *gh = &gr->gr_gh; | |
1353 | struct gfs2_glock *gl = gh->gh_gl; | |
1354 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
1355 | ||
1356 | clear_bit(GLF_SKIP_WAITERS2, &gl->gl_flags); | |
1357 | ||
1358 | if (glops->go_greedy) | |
1359 | glops->go_greedy(gl); | |
1360 | ||
1361 | spin_lock(&gl->gl_spin); | |
1362 | ||
1363 | if (list_empty(&gl->gl_waiters2)) { | |
1364 | clear_bit(GLF_GREEDY, &gl->gl_flags); | |
1365 | spin_unlock(&gl->gl_spin); | |
1366 | gfs2_holder_uninit(gh); | |
1367 | kfree(gr); | |
1368 | } else { | |
1369 | gfs2_glock_hold(gl); | |
1370 | list_add_tail(&gh->gh_list, &gl->gl_waiters2); | |
1371 | run_queue(gl); | |
1372 | spin_unlock(&gl->gl_spin); | |
1373 | gfs2_glock_put(gl); | |
1374 | } | |
1375 | } | |
1376 | ||
1377 | /** | |
1378 | * gfs2_glock_be_greedy - | |
1379 | * @gl: | |
1380 | * @time: | |
1381 | * | |
1382 | * Returns: 0 if go_greedy will be called, 1 otherwise | |
1383 | */ | |
1384 | ||
1385 | int gfs2_glock_be_greedy(struct gfs2_glock *gl, unsigned int time) | |
1386 | { | |
1387 | struct greedy *gr; | |
1388 | struct gfs2_holder *gh; | |
1389 | ||
1390 | if (!time || | |
1391 | gl->gl_sbd->sd_args.ar_localcaching || | |
1392 | test_and_set_bit(GLF_GREEDY, &gl->gl_flags)) | |
1393 | return 1; | |
1394 | ||
1395 | gr = kmalloc(sizeof(struct greedy), GFP_KERNEL); | |
1396 | if (!gr) { | |
1397 | clear_bit(GLF_GREEDY, &gl->gl_flags); | |
1398 | return 1; | |
1399 | } | |
1400 | gh = &gr->gr_gh; | |
1401 | ||
579b78a4 | 1402 | gfs2_holder_init(gl, 0, 0, gh); |
b3b94faa DT |
1403 | set_bit(HIF_GREEDY, &gh->gh_iflags); |
1404 | INIT_WORK(&gr->gr_work, greedy_work, gr); | |
1405 | ||
1406 | set_bit(GLF_SKIP_WAITERS2, &gl->gl_flags); | |
1407 | schedule_delayed_work(&gr->gr_work, time); | |
1408 | ||
1409 | return 0; | |
1410 | } | |
1411 | ||
b3b94faa DT |
1412 | /** |
1413 | * gfs2_glock_dq_uninit - dequeue a holder from a glock and initialize it | |
1414 | * @gh: the holder structure | |
1415 | * | |
1416 | */ | |
1417 | ||
1418 | void gfs2_glock_dq_uninit(struct gfs2_holder *gh) | |
1419 | { | |
1420 | gfs2_glock_dq(gh); | |
1421 | gfs2_holder_uninit(gh); | |
1422 | } | |
1423 | ||
1424 | /** | |
1425 | * gfs2_glock_nq_num - acquire a glock based on lock number | |
1426 | * @sdp: the filesystem | |
1427 | * @number: the lock number | |
1428 | * @glops: the glock operations for the type of glock | |
1429 | * @state: the state to acquire the glock in | |
1430 | * @flags: modifier flags for the aquisition | |
1431 | * @gh: the struct gfs2_holder | |
1432 | * | |
1433 | * Returns: errno | |
1434 | */ | |
1435 | ||
1436 | int gfs2_glock_nq_num(struct gfs2_sbd *sdp, uint64_t number, | |
1437 | struct gfs2_glock_operations *glops, unsigned int state, | |
1438 | int flags, struct gfs2_holder *gh) | |
1439 | { | |
1440 | struct gfs2_glock *gl; | |
1441 | int error; | |
1442 | ||
1443 | error = gfs2_glock_get(sdp, number, glops, CREATE, &gl); | |
1444 | if (!error) { | |
1445 | error = gfs2_glock_nq_init(gl, state, flags, gh); | |
1446 | gfs2_glock_put(gl); | |
1447 | } | |
1448 | ||
1449 | return error; | |
1450 | } | |
1451 | ||
1452 | /** | |
1453 | * glock_compare - Compare two struct gfs2_glock structures for sorting | |
1454 | * @arg_a: the first structure | |
1455 | * @arg_b: the second structure | |
1456 | * | |
1457 | */ | |
1458 | ||
1459 | static int glock_compare(const void *arg_a, const void *arg_b) | |
1460 | { | |
1461 | struct gfs2_holder *gh_a = *(struct gfs2_holder **)arg_a; | |
1462 | struct gfs2_holder *gh_b = *(struct gfs2_holder **)arg_b; | |
1463 | struct lm_lockname *a = &gh_a->gh_gl->gl_name; | |
1464 | struct lm_lockname *b = &gh_b->gh_gl->gl_name; | |
1465 | int ret = 0; | |
1466 | ||
1467 | if (a->ln_number > b->ln_number) | |
1468 | ret = 1; | |
1469 | else if (a->ln_number < b->ln_number) | |
1470 | ret = -1; | |
1471 | else { | |
1472 | if (gh_a->gh_state == LM_ST_SHARED && | |
1473 | gh_b->gh_state == LM_ST_EXCLUSIVE) | |
1474 | ret = 1; | |
1475 | else if (!(gh_a->gh_flags & GL_LOCAL_EXCL) && | |
1476 | (gh_b->gh_flags & GL_LOCAL_EXCL)) | |
1477 | ret = 1; | |
1478 | } | |
1479 | ||
1480 | return ret; | |
1481 | } | |
1482 | ||
1483 | /** | |
1484 | * nq_m_sync - synchonously acquire more than one glock in deadlock free order | |
1485 | * @num_gh: the number of structures | |
1486 | * @ghs: an array of struct gfs2_holder structures | |
1487 | * | |
1488 | * Returns: 0 on success (all glocks acquired), | |
1489 | * errno on failure (no glocks acquired) | |
1490 | */ | |
1491 | ||
1492 | static int nq_m_sync(unsigned int num_gh, struct gfs2_holder *ghs, | |
1493 | struct gfs2_holder **p) | |
1494 | { | |
1495 | unsigned int x; | |
1496 | int error = 0; | |
1497 | ||
1498 | for (x = 0; x < num_gh; x++) | |
1499 | p[x] = &ghs[x]; | |
1500 | ||
1501 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare, NULL); | |
1502 | ||
1503 | for (x = 0; x < num_gh; x++) { | |
1504 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1505 | ||
1506 | error = gfs2_glock_nq(p[x]); | |
1507 | if (error) { | |
1508 | while (x--) | |
1509 | gfs2_glock_dq(p[x]); | |
1510 | break; | |
1511 | } | |
1512 | } | |
1513 | ||
1514 | return error; | |
1515 | } | |
1516 | ||
1517 | /** | |
1518 | * gfs2_glock_nq_m - acquire multiple glocks | |
1519 | * @num_gh: the number of structures | |
1520 | * @ghs: an array of struct gfs2_holder structures | |
1521 | * | |
1522 | * Figure out how big an impact this function has. Either: | |
1523 | * 1) Replace this code with code that calls gfs2_glock_prefetch() | |
1524 | * 2) Forget async stuff and just call nq_m_sync() | |
1525 | * 3) Leave it like it is | |
1526 | * | |
1527 | * Returns: 0 on success (all glocks acquired), | |
1528 | * errno on failure (no glocks acquired) | |
1529 | */ | |
1530 | ||
1531 | int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1532 | { | |
1533 | int *e; | |
1534 | unsigned int x; | |
1535 | int borked = 0, serious = 0; | |
1536 | int error = 0; | |
1537 | ||
1538 | if (!num_gh) | |
1539 | return 0; | |
1540 | ||
1541 | if (num_gh == 1) { | |
1542 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1543 | return gfs2_glock_nq(ghs); | |
1544 | } | |
1545 | ||
1546 | e = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL); | |
1547 | if (!e) | |
1548 | return -ENOMEM; | |
1549 | ||
1550 | for (x = 0; x < num_gh; x++) { | |
1551 | ghs[x].gh_flags |= LM_FLAG_TRY | GL_ASYNC; | |
1552 | error = gfs2_glock_nq(&ghs[x]); | |
1553 | if (error) { | |
1554 | borked = 1; | |
1555 | serious = error; | |
1556 | num_gh = x; | |
1557 | break; | |
1558 | } | |
1559 | } | |
1560 | ||
1561 | for (x = 0; x < num_gh; x++) { | |
1562 | error = e[x] = glock_wait_internal(&ghs[x]); | |
1563 | if (error) { | |
1564 | borked = 1; | |
1565 | if (error != GLR_TRYFAILED && error != GLR_CANCELED) | |
1566 | serious = error; | |
1567 | } | |
1568 | } | |
1569 | ||
1570 | if (!borked) { | |
1571 | kfree(e); | |
1572 | return 0; | |
1573 | } | |
1574 | ||
1575 | for (x = 0; x < num_gh; x++) | |
1576 | if (!e[x]) | |
1577 | gfs2_glock_dq(&ghs[x]); | |
1578 | ||
1579 | if (serious) | |
1580 | error = serious; | |
1581 | else { | |
1582 | for (x = 0; x < num_gh; x++) | |
1583 | gfs2_holder_reinit(ghs[x].gh_state, ghs[x].gh_flags, | |
1584 | &ghs[x]); | |
1585 | error = nq_m_sync(num_gh, ghs, (struct gfs2_holder **)e); | |
1586 | } | |
1587 | ||
1588 | kfree(e); | |
1589 | ||
1590 | return error; | |
1591 | } | |
1592 | ||
1593 | /** | |
1594 | * gfs2_glock_dq_m - release multiple glocks | |
1595 | * @num_gh: the number of structures | |
1596 | * @ghs: an array of struct gfs2_holder structures | |
1597 | * | |
1598 | */ | |
1599 | ||
1600 | void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1601 | { | |
1602 | unsigned int x; | |
1603 | ||
1604 | for (x = 0; x < num_gh; x++) | |
1605 | gfs2_glock_dq(&ghs[x]); | |
1606 | } | |
1607 | ||
1608 | /** | |
1609 | * gfs2_glock_dq_uninit_m - release multiple glocks | |
1610 | * @num_gh: the number of structures | |
1611 | * @ghs: an array of struct gfs2_holder structures | |
1612 | * | |
1613 | */ | |
1614 | ||
1615 | void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1616 | { | |
1617 | unsigned int x; | |
1618 | ||
1619 | for (x = 0; x < num_gh; x++) | |
1620 | gfs2_glock_dq_uninit(&ghs[x]); | |
1621 | } | |
1622 | ||
1623 | /** | |
1624 | * gfs2_glock_prefetch_num - prefetch a glock based on lock number | |
1625 | * @sdp: the filesystem | |
1626 | * @number: the lock number | |
1627 | * @glops: the glock operations for the type of glock | |
1628 | * @state: the state to acquire the glock in | |
1629 | * @flags: modifier flags for the aquisition | |
1630 | * | |
1631 | * Returns: errno | |
1632 | */ | |
1633 | ||
1634 | void gfs2_glock_prefetch_num(struct gfs2_sbd *sdp, uint64_t number, | |
1635 | struct gfs2_glock_operations *glops, | |
1636 | unsigned int state, int flags) | |
1637 | { | |
1638 | struct gfs2_glock *gl; | |
1639 | int error; | |
1640 | ||
1641 | if (atomic_read(&sdp->sd_reclaim_count) < | |
1642 | gfs2_tune_get(sdp, gt_reclaim_limit)) { | |
1643 | error = gfs2_glock_get(sdp, number, glops, CREATE, &gl); | |
1644 | if (!error) { | |
1645 | gfs2_glock_prefetch(gl, state, flags); | |
1646 | gfs2_glock_put(gl); | |
1647 | } | |
1648 | } | |
1649 | } | |
1650 | ||
1651 | /** | |
1652 | * gfs2_lvb_hold - attach a LVB from a glock | |
1653 | * @gl: The glock in question | |
1654 | * | |
1655 | */ | |
1656 | ||
1657 | int gfs2_lvb_hold(struct gfs2_glock *gl) | |
1658 | { | |
1659 | int error; | |
1660 | ||
1661 | gfs2_glmutex_lock(gl); | |
1662 | ||
1663 | if (!atomic_read(&gl->gl_lvb_count)) { | |
1664 | error = gfs2_lm_hold_lvb(gl->gl_sbd, gl->gl_lock, &gl->gl_lvb); | |
1665 | if (error) { | |
1666 | gfs2_glmutex_unlock(gl); | |
1667 | return error; | |
1668 | } | |
1669 | gfs2_glock_hold(gl); | |
1670 | } | |
1671 | atomic_inc(&gl->gl_lvb_count); | |
1672 | ||
1673 | gfs2_glmutex_unlock(gl); | |
1674 | ||
1675 | return 0; | |
1676 | } | |
1677 | ||
1678 | /** | |
1679 | * gfs2_lvb_unhold - detach a LVB from a glock | |
1680 | * @gl: The glock in question | |
1681 | * | |
1682 | */ | |
1683 | ||
1684 | void gfs2_lvb_unhold(struct gfs2_glock *gl) | |
1685 | { | |
1686 | gfs2_glock_hold(gl); | |
1687 | gfs2_glmutex_lock(gl); | |
1688 | ||
1689 | gfs2_assert(gl->gl_sbd, atomic_read(&gl->gl_lvb_count) > 0); | |
1690 | if (atomic_dec_and_test(&gl->gl_lvb_count)) { | |
1691 | gfs2_lm_unhold_lvb(gl->gl_sbd, gl->gl_lock, gl->gl_lvb); | |
1692 | gl->gl_lvb = NULL; | |
1693 | gfs2_glock_put(gl); | |
1694 | } | |
1695 | ||
1696 | gfs2_glmutex_unlock(gl); | |
1697 | gfs2_glock_put(gl); | |
1698 | } | |
1699 | ||
1700 | void gfs2_lvb_sync(struct gfs2_glock *gl) | |
1701 | { | |
1702 | gfs2_glmutex_lock(gl); | |
1703 | ||
1704 | gfs2_assert(gl->gl_sbd, atomic_read(&gl->gl_lvb_count)); | |
1705 | if (!gfs2_assert_warn(gl->gl_sbd, gfs2_glock_is_held_excl(gl))) | |
1706 | gfs2_lm_sync_lvb(gl->gl_sbd, gl->gl_lock, gl->gl_lvb); | |
1707 | ||
1708 | gfs2_glmutex_unlock(gl); | |
1709 | } | |
1710 | ||
1711 | static void blocking_cb(struct gfs2_sbd *sdp, struct lm_lockname *name, | |
1712 | unsigned int state) | |
1713 | { | |
1714 | struct gfs2_glock *gl; | |
1715 | ||
1716 | gl = gfs2_glock_find(sdp, name); | |
1717 | if (!gl) | |
1718 | return; | |
1719 | ||
1720 | if (gl->gl_ops->go_callback) | |
1721 | gl->gl_ops->go_callback(gl, state); | |
1722 | handle_callback(gl, state); | |
1723 | ||
1724 | spin_lock(&gl->gl_spin); | |
1725 | run_queue(gl); | |
1726 | spin_unlock(&gl->gl_spin); | |
1727 | ||
1728 | gfs2_glock_put(gl); | |
1729 | } | |
1730 | ||
1731 | /** | |
1732 | * gfs2_glock_cb - Callback used by locking module | |
1733 | * @fsdata: Pointer to the superblock | |
1734 | * @type: Type of callback | |
1735 | * @data: Type dependent data pointer | |
1736 | * | |
1737 | * Called by the locking module when it wants to tell us something. | |
1738 | * Either we need to drop a lock, one of our ASYNC requests completed, or | |
1739 | * a journal from another client needs to be recovered. | |
1740 | */ | |
1741 | ||
1742 | void gfs2_glock_cb(lm_fsdata_t *fsdata, unsigned int type, void *data) | |
1743 | { | |
1744 | struct gfs2_sbd *sdp = (struct gfs2_sbd *)fsdata; | |
1745 | ||
b3b94faa DT |
1746 | switch (type) { |
1747 | case LM_CB_NEED_E: | |
1748 | blocking_cb(sdp, (struct lm_lockname *)data, LM_ST_UNLOCKED); | |
1749 | return; | |
1750 | ||
1751 | case LM_CB_NEED_D: | |
1752 | blocking_cb(sdp, (struct lm_lockname *)data, LM_ST_DEFERRED); | |
1753 | return; | |
1754 | ||
1755 | case LM_CB_NEED_S: | |
1756 | blocking_cb(sdp, (struct lm_lockname *)data, LM_ST_SHARED); | |
1757 | return; | |
1758 | ||
1759 | case LM_CB_ASYNC: { | |
1760 | struct lm_async_cb *async = (struct lm_async_cb *)data; | |
1761 | struct gfs2_glock *gl; | |
1762 | ||
1763 | gl = gfs2_glock_find(sdp, &async->lc_name); | |
1764 | if (gfs2_assert_warn(sdp, gl)) | |
1765 | return; | |
1766 | if (!gfs2_assert_warn(sdp, gl->gl_req_bh)) | |
1767 | gl->gl_req_bh(gl, async->lc_ret); | |
1768 | gfs2_glock_put(gl); | |
1769 | ||
1770 | return; | |
1771 | } | |
1772 | ||
1773 | case LM_CB_NEED_RECOVERY: | |
1774 | gfs2_jdesc_make_dirty(sdp, *(unsigned int *)data); | |
1775 | if (sdp->sd_recoverd_process) | |
1776 | wake_up_process(sdp->sd_recoverd_process); | |
1777 | return; | |
1778 | ||
1779 | case LM_CB_DROPLOCKS: | |
1780 | gfs2_gl_hash_clear(sdp, NO_WAIT); | |
1781 | gfs2_quota_scan(sdp); | |
1782 | return; | |
1783 | ||
1784 | default: | |
1785 | gfs2_assert_warn(sdp, 0); | |
1786 | return; | |
1787 | } | |
1788 | } | |
1789 | ||
1790 | /** | |
1791 | * gfs2_try_toss_inode - try to remove a particular inode struct from cache | |
1792 | * sdp: the filesystem | |
1793 | * inum: the inode number | |
1794 | * | |
1795 | */ | |
1796 | ||
1797 | void gfs2_try_toss_inode(struct gfs2_sbd *sdp, struct gfs2_inum *inum) | |
1798 | { | |
1799 | struct gfs2_glock *gl; | |
1800 | struct gfs2_inode *ip; | |
1801 | int error; | |
1802 | ||
1803 | error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, | |
1804 | NO_CREATE, &gl); | |
1805 | if (error || !gl) | |
1806 | return; | |
1807 | ||
1808 | if (!gfs2_glmutex_trylock(gl)) | |
1809 | goto out; | |
1810 | ||
5c676f6d | 1811 | ip = gl->gl_object; |
b3b94faa DT |
1812 | if (!ip) |
1813 | goto out_unlock; | |
1814 | ||
1815 | if (atomic_read(&ip->i_count)) | |
1816 | goto out_unlock; | |
1817 | ||
1818 | gfs2_inode_destroy(ip); | |
1819 | ||
1820 | out_unlock: | |
1821 | gfs2_glmutex_unlock(gl); | |
1822 | ||
1823 | out: | |
1824 | gfs2_glock_put(gl); | |
1825 | } | |
1826 | ||
1827 | /** | |
1828 | * gfs2_iopen_go_callback - Try to kick the inode/vnode associated with an | |
1829 | * iopen glock from memory | |
1830 | * @io_gl: the iopen glock | |
1831 | * @state: the state into which the glock should be put | |
1832 | * | |
1833 | */ | |
1834 | ||
1835 | void gfs2_iopen_go_callback(struct gfs2_glock *io_gl, unsigned int state) | |
1836 | { | |
1837 | struct gfs2_glock *i_gl; | |
1838 | ||
1839 | if (state != LM_ST_UNLOCKED) | |
1840 | return; | |
1841 | ||
1842 | spin_lock(&io_gl->gl_spin); | |
5c676f6d | 1843 | i_gl = io_gl->gl_object; |
b3b94faa DT |
1844 | if (i_gl) { |
1845 | gfs2_glock_hold(i_gl); | |
1846 | spin_unlock(&io_gl->gl_spin); | |
1847 | } else { | |
1848 | spin_unlock(&io_gl->gl_spin); | |
1849 | return; | |
1850 | } | |
1851 | ||
1852 | if (gfs2_glmutex_trylock(i_gl)) { | |
5c676f6d | 1853 | struct gfs2_inode *ip = i_gl->gl_object; |
b3b94faa DT |
1854 | if (ip) { |
1855 | gfs2_try_toss_vnode(ip); | |
1856 | gfs2_glmutex_unlock(i_gl); | |
1857 | gfs2_glock_schedule_for_reclaim(i_gl); | |
1858 | goto out; | |
1859 | } | |
1860 | gfs2_glmutex_unlock(i_gl); | |
1861 | } | |
1862 | ||
1863 | out: | |
1864 | gfs2_glock_put(i_gl); | |
1865 | } | |
1866 | ||
1867 | /** | |
1868 | * demote_ok - Check to see if it's ok to unlock a glock | |
1869 | * @gl: the glock | |
1870 | * | |
1871 | * Returns: 1 if it's ok | |
1872 | */ | |
1873 | ||
1874 | static int demote_ok(struct gfs2_glock *gl) | |
1875 | { | |
1876 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1877 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
1878 | int demote = 1; | |
1879 | ||
1880 | if (test_bit(GLF_STICKY, &gl->gl_flags)) | |
1881 | demote = 0; | |
1882 | else if (test_bit(GLF_PREFETCH, &gl->gl_flags)) | |
1883 | demote = time_after_eq(jiffies, | |
1884 | gl->gl_stamp + | |
1885 | gfs2_tune_get(sdp, gt_prefetch_secs) * HZ); | |
1886 | else if (glops->go_demote_ok) | |
1887 | demote = glops->go_demote_ok(gl); | |
1888 | ||
1889 | return demote; | |
1890 | } | |
1891 | ||
1892 | /** | |
1893 | * gfs2_glock_schedule_for_reclaim - Add a glock to the reclaim list | |
1894 | * @gl: the glock | |
1895 | * | |
1896 | */ | |
1897 | ||
1898 | void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl) | |
1899 | { | |
1900 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1901 | ||
1902 | spin_lock(&sdp->sd_reclaim_lock); | |
1903 | if (list_empty(&gl->gl_reclaim)) { | |
1904 | gfs2_glock_hold(gl); | |
1905 | list_add(&gl->gl_reclaim, &sdp->sd_reclaim_list); | |
1906 | atomic_inc(&sdp->sd_reclaim_count); | |
1907 | } | |
1908 | spin_unlock(&sdp->sd_reclaim_lock); | |
1909 | ||
1910 | wake_up(&sdp->sd_reclaim_wq); | |
1911 | } | |
1912 | ||
1913 | /** | |
1914 | * gfs2_reclaim_glock - process the next glock on the filesystem's reclaim list | |
1915 | * @sdp: the filesystem | |
1916 | * | |
1917 | * Called from gfs2_glockd() glock reclaim daemon, or when promoting a | |
1918 | * different glock and we notice that there are a lot of glocks in the | |
1919 | * reclaim list. | |
1920 | * | |
1921 | */ | |
1922 | ||
1923 | void gfs2_reclaim_glock(struct gfs2_sbd *sdp) | |
1924 | { | |
1925 | struct gfs2_glock *gl; | |
1926 | ||
1927 | spin_lock(&sdp->sd_reclaim_lock); | |
1928 | if (list_empty(&sdp->sd_reclaim_list)) { | |
1929 | spin_unlock(&sdp->sd_reclaim_lock); | |
1930 | return; | |
1931 | } | |
1932 | gl = list_entry(sdp->sd_reclaim_list.next, | |
1933 | struct gfs2_glock, gl_reclaim); | |
1934 | list_del_init(&gl->gl_reclaim); | |
1935 | spin_unlock(&sdp->sd_reclaim_lock); | |
1936 | ||
1937 | atomic_dec(&sdp->sd_reclaim_count); | |
1938 | atomic_inc(&sdp->sd_reclaimed); | |
1939 | ||
1940 | if (gfs2_glmutex_trylock(gl)) { | |
1941 | if (gl->gl_ops == &gfs2_inode_glops) { | |
5c676f6d | 1942 | struct gfs2_inode *ip = gl->gl_object; |
b3b94faa DT |
1943 | if (ip && !atomic_read(&ip->i_count)) |
1944 | gfs2_inode_destroy(ip); | |
1945 | } | |
1946 | if (queue_empty(gl, &gl->gl_holders) && | |
1947 | gl->gl_state != LM_ST_UNLOCKED && | |
1948 | demote_ok(gl)) | |
1949 | handle_callback(gl, LM_ST_UNLOCKED); | |
1950 | gfs2_glmutex_unlock(gl); | |
1951 | } | |
1952 | ||
1953 | gfs2_glock_put(gl); | |
1954 | } | |
1955 | ||
1956 | /** | |
1957 | * examine_bucket - Call a function for glock in a hash bucket | |
1958 | * @examiner: the function | |
1959 | * @sdp: the filesystem | |
1960 | * @bucket: the bucket | |
1961 | * | |
1962 | * Returns: 1 if the bucket has entries | |
1963 | */ | |
1964 | ||
1965 | static int examine_bucket(glock_examiner examiner, struct gfs2_sbd *sdp, | |
1966 | struct gfs2_gl_hash_bucket *bucket) | |
1967 | { | |
1968 | struct glock_plug plug; | |
1969 | struct list_head *tmp; | |
1970 | struct gfs2_glock *gl; | |
1971 | int entries; | |
1972 | ||
1973 | /* Add "plug" to end of bucket list, work back up list from there */ | |
1974 | memset(&plug.gl_flags, 0, sizeof(unsigned long)); | |
1975 | set_bit(GLF_PLUG, &plug.gl_flags); | |
1976 | ||
1977 | write_lock(&bucket->hb_lock); | |
1978 | list_add(&plug.gl_list, &bucket->hb_list); | |
1979 | write_unlock(&bucket->hb_lock); | |
1980 | ||
1981 | for (;;) { | |
1982 | write_lock(&bucket->hb_lock); | |
1983 | ||
1984 | for (;;) { | |
1985 | tmp = plug.gl_list.next; | |
1986 | ||
1987 | if (tmp == &bucket->hb_list) { | |
1988 | list_del(&plug.gl_list); | |
1989 | entries = !list_empty(&bucket->hb_list); | |
1990 | write_unlock(&bucket->hb_lock); | |
1991 | return entries; | |
1992 | } | |
1993 | gl = list_entry(tmp, struct gfs2_glock, gl_list); | |
1994 | ||
1995 | /* Move plug up list */ | |
1996 | list_move(&plug.gl_list, &gl->gl_list); | |
1997 | ||
1998 | if (test_bit(GLF_PLUG, &gl->gl_flags)) | |
1999 | continue; | |
2000 | ||
2001 | /* examiner() must glock_put() */ | |
2002 | gfs2_glock_hold(gl); | |
2003 | ||
2004 | break; | |
2005 | } | |
2006 | ||
2007 | write_unlock(&bucket->hb_lock); | |
2008 | ||
2009 | examiner(gl); | |
2010 | } | |
2011 | } | |
2012 | ||
2013 | /** | |
2014 | * scan_glock - look at a glock and see if we can reclaim it | |
2015 | * @gl: the glock to look at | |
2016 | * | |
2017 | */ | |
2018 | ||
2019 | static void scan_glock(struct gfs2_glock *gl) | |
2020 | { | |
2021 | if (gfs2_glmutex_trylock(gl)) { | |
2022 | if (gl->gl_ops == &gfs2_inode_glops) { | |
5c676f6d | 2023 | struct gfs2_inode *ip = gl->gl_object; |
b3b94faa DT |
2024 | if (ip && !atomic_read(&ip->i_count)) |
2025 | goto out_schedule; | |
2026 | } | |
2027 | if (queue_empty(gl, &gl->gl_holders) && | |
2028 | gl->gl_state != LM_ST_UNLOCKED && | |
2029 | demote_ok(gl)) | |
2030 | goto out_schedule; | |
2031 | ||
2032 | gfs2_glmutex_unlock(gl); | |
2033 | } | |
2034 | ||
2035 | gfs2_glock_put(gl); | |
2036 | ||
2037 | return; | |
2038 | ||
2039 | out_schedule: | |
2040 | gfs2_glmutex_unlock(gl); | |
2041 | gfs2_glock_schedule_for_reclaim(gl); | |
2042 | gfs2_glock_put(gl); | |
2043 | } | |
2044 | ||
2045 | /** | |
2046 | * gfs2_scand_internal - Look for glocks and inodes to toss from memory | |
2047 | * @sdp: the filesystem | |
2048 | * | |
2049 | */ | |
2050 | ||
2051 | void gfs2_scand_internal(struct gfs2_sbd *sdp) | |
2052 | { | |
2053 | unsigned int x; | |
2054 | ||
2055 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) { | |
2056 | examine_bucket(scan_glock, sdp, &sdp->sd_gl_hash[x]); | |
2057 | cond_resched(); | |
2058 | } | |
2059 | } | |
2060 | ||
2061 | /** | |
2062 | * clear_glock - look at a glock and see if we can free it from glock cache | |
2063 | * @gl: the glock to look at | |
2064 | * | |
2065 | */ | |
2066 | ||
2067 | static void clear_glock(struct gfs2_glock *gl) | |
2068 | { | |
2069 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
2070 | int released; | |
2071 | ||
2072 | spin_lock(&sdp->sd_reclaim_lock); | |
2073 | if (!list_empty(&gl->gl_reclaim)) { | |
2074 | list_del_init(&gl->gl_reclaim); | |
2075 | atomic_dec(&sdp->sd_reclaim_count); | |
190562bd | 2076 | spin_unlock(&sdp->sd_reclaim_lock); |
b3b94faa DT |
2077 | released = gfs2_glock_put(gl); |
2078 | gfs2_assert(sdp, !released); | |
190562bd SW |
2079 | } else { |
2080 | spin_unlock(&sdp->sd_reclaim_lock); | |
b3b94faa | 2081 | } |
b3b94faa DT |
2082 | |
2083 | if (gfs2_glmutex_trylock(gl)) { | |
2084 | if (gl->gl_ops == &gfs2_inode_glops) { | |
5c676f6d | 2085 | struct gfs2_inode *ip = gl->gl_object; |
b3b94faa DT |
2086 | if (ip && !atomic_read(&ip->i_count)) |
2087 | gfs2_inode_destroy(ip); | |
2088 | } | |
2089 | if (queue_empty(gl, &gl->gl_holders) && | |
2090 | gl->gl_state != LM_ST_UNLOCKED) | |
2091 | handle_callback(gl, LM_ST_UNLOCKED); | |
2092 | ||
2093 | gfs2_glmutex_unlock(gl); | |
2094 | } | |
2095 | ||
2096 | gfs2_glock_put(gl); | |
2097 | } | |
2098 | ||
2099 | /** | |
2100 | * gfs2_gl_hash_clear - Empty out the glock hash table | |
2101 | * @sdp: the filesystem | |
2102 | * @wait: wait until it's all gone | |
2103 | * | |
2104 | * Called when unmounting the filesystem, or when inter-node lock manager | |
2105 | * requests DROPLOCKS because it is running out of capacity. | |
2106 | */ | |
2107 | ||
2108 | void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait) | |
2109 | { | |
2110 | unsigned long t; | |
2111 | unsigned int x; | |
2112 | int cont; | |
2113 | ||
2114 | t = jiffies; | |
2115 | ||
2116 | for (;;) { | |
2117 | cont = 0; | |
2118 | ||
2119 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) | |
2120 | if (examine_bucket(clear_glock, sdp, | |
2121 | &sdp->sd_gl_hash[x])) | |
2122 | cont = 1; | |
2123 | ||
2124 | if (!wait || !cont) | |
2125 | break; | |
2126 | ||
2127 | if (time_after_eq(jiffies, | |
2128 | t + gfs2_tune_get(sdp, gt_stall_secs) * HZ)) { | |
2129 | fs_warn(sdp, "Unmount seems to be stalled. " | |
2130 | "Dumping lock state...\n"); | |
2131 | gfs2_dump_lockstate(sdp); | |
2132 | t = jiffies; | |
2133 | } | |
2134 | ||
2135 | /* invalidate_inodes() requires that the sb inodes list | |
2136 | not change, but an async completion callback for an | |
2137 | unlock can occur which does glock_put() which | |
2138 | can call iput() which will change the sb inodes list. | |
2139 | invalidate_inodes_mutex prevents glock_put()'s during | |
2140 | an invalidate_inodes() */ | |
2141 | ||
f55ab26a | 2142 | mutex_lock(&sdp->sd_invalidate_inodes_mutex); |
b3b94faa | 2143 | invalidate_inodes(sdp->sd_vfs); |
f55ab26a | 2144 | mutex_unlock(&sdp->sd_invalidate_inodes_mutex); |
b3b94faa DT |
2145 | yield(); |
2146 | } | |
2147 | } | |
2148 | ||
2149 | /* | |
2150 | * Diagnostic routines to help debug distributed deadlock | |
2151 | */ | |
2152 | ||
2153 | /** | |
2154 | * dump_holder - print information about a glock holder | |
2155 | * @str: a string naming the type of holder | |
2156 | * @gh: the glock holder | |
2157 | * | |
2158 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
2159 | */ | |
2160 | ||
2161 | static int dump_holder(char *str, struct gfs2_holder *gh) | |
2162 | { | |
2163 | unsigned int x; | |
2164 | int error = -ENOBUFS; | |
2165 | ||
d92a8d48 SW |
2166 | printk(KERN_INFO " %s\n", str); |
2167 | printk(KERN_INFO " owner = %ld\n", | |
b3b94faa | 2168 | (gh->gh_owner) ? (long)gh->gh_owner->pid : -1); |
d92a8d48 SW |
2169 | printk(KERN_INFO " gh_state = %u\n", gh->gh_state); |
2170 | printk(KERN_INFO " gh_flags ="); | |
b3b94faa DT |
2171 | for (x = 0; x < 32; x++) |
2172 | if (gh->gh_flags & (1 << x)) | |
2173 | printk(" %u", x); | |
2174 | printk(" \n"); | |
d92a8d48 SW |
2175 | printk(KERN_INFO " error = %d\n", gh->gh_error); |
2176 | printk(KERN_INFO " gh_iflags ="); | |
b3b94faa DT |
2177 | for (x = 0; x < 32; x++) |
2178 | if (test_bit(x, &gh->gh_iflags)) | |
2179 | printk(" %u", x); | |
2180 | printk(" \n"); | |
d0dc80db | 2181 | print_symbol(KERN_INFO " initialized at: %s\n", gh->gh_ip); |
b3b94faa DT |
2182 | |
2183 | error = 0; | |
2184 | ||
2185 | return error; | |
2186 | } | |
2187 | ||
2188 | /** | |
2189 | * dump_inode - print information about an inode | |
2190 | * @ip: the inode | |
2191 | * | |
2192 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
2193 | */ | |
2194 | ||
2195 | static int dump_inode(struct gfs2_inode *ip) | |
2196 | { | |
2197 | unsigned int x; | |
2198 | int error = -ENOBUFS; | |
2199 | ||
d92a8d48 SW |
2200 | printk(KERN_INFO " Inode:\n"); |
2201 | printk(KERN_INFO " num = %llu %llu\n", | |
b3b94faa | 2202 | ip->i_num.no_formal_ino, ip->i_num.no_addr); |
d92a8d48 SW |
2203 | printk(KERN_INFO " type = %u\n", IF2DT(ip->i_di.di_mode)); |
2204 | printk(KERN_INFO " i_count = %d\n", atomic_read(&ip->i_count)); | |
2205 | printk(KERN_INFO " i_flags ="); | |
b3b94faa DT |
2206 | for (x = 0; x < 32; x++) |
2207 | if (test_bit(x, &ip->i_flags)) | |
2208 | printk(" %u", x); | |
2209 | printk(" \n"); | |
d92a8d48 | 2210 | printk(KERN_INFO " vnode = %s\n", (ip->i_vnode) ? "yes" : "no"); |
b3b94faa DT |
2211 | |
2212 | error = 0; | |
2213 | ||
2214 | return error; | |
2215 | } | |
2216 | ||
2217 | /** | |
2218 | * dump_glock - print information about a glock | |
2219 | * @gl: the glock | |
2220 | * @count: where we are in the buffer | |
2221 | * | |
2222 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
2223 | */ | |
2224 | ||
2225 | static int dump_glock(struct gfs2_glock *gl) | |
2226 | { | |
2227 | struct gfs2_holder *gh; | |
2228 | unsigned int x; | |
2229 | int error = -ENOBUFS; | |
2230 | ||
2231 | spin_lock(&gl->gl_spin); | |
2232 | ||
d92a8d48 | 2233 | printk(KERN_INFO "Glock (%u, %llu)\n", |
b3b94faa DT |
2234 | gl->gl_name.ln_type, |
2235 | gl->gl_name.ln_number); | |
d92a8d48 | 2236 | printk(KERN_INFO " gl_flags ="); |
b3b94faa DT |
2237 | for (x = 0; x < 32; x++) |
2238 | if (test_bit(x, &gl->gl_flags)) | |
2239 | printk(" %u", x); | |
2240 | printk(" \n"); | |
d92a8d48 SW |
2241 | printk(KERN_INFO " gl_ref = %d\n", atomic_read(&gl->gl_ref.refcount)); |
2242 | printk(KERN_INFO " gl_state = %u\n", gl->gl_state); | |
2243 | printk(KERN_INFO " req_gh = %s\n", (gl->gl_req_gh) ? "yes" : "no"); | |
2244 | printk(KERN_INFO " req_bh = %s\n", (gl->gl_req_bh) ? "yes" : "no"); | |
2245 | printk(KERN_INFO " lvb_count = %d\n", atomic_read(&gl->gl_lvb_count)); | |
2246 | printk(KERN_INFO " object = %s\n", (gl->gl_object) ? "yes" : "no"); | |
2247 | printk(KERN_INFO " le = %s\n", | |
b3b94faa | 2248 | (list_empty(&gl->gl_le.le_list)) ? "no" : "yes"); |
d92a8d48 | 2249 | printk(KERN_INFO " reclaim = %s\n", |
b3b94faa DT |
2250 | (list_empty(&gl->gl_reclaim)) ? "no" : "yes"); |
2251 | if (gl->gl_aspace) | |
d92a8d48 | 2252 | printk(KERN_INFO " aspace = %lu\n", |
b3b94faa DT |
2253 | gl->gl_aspace->i_mapping->nrpages); |
2254 | else | |
d92a8d48 SW |
2255 | printk(KERN_INFO " aspace = no\n"); |
2256 | printk(KERN_INFO " ail = %d\n", atomic_read(&gl->gl_ail_count)); | |
b3b94faa DT |
2257 | if (gl->gl_req_gh) { |
2258 | error = dump_holder("Request", gl->gl_req_gh); | |
2259 | if (error) | |
2260 | goto out; | |
2261 | } | |
2262 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
2263 | error = dump_holder("Holder", gh); | |
2264 | if (error) | |
2265 | goto out; | |
2266 | } | |
2267 | list_for_each_entry(gh, &gl->gl_waiters1, gh_list) { | |
2268 | error = dump_holder("Waiter1", gh); | |
2269 | if (error) | |
2270 | goto out; | |
2271 | } | |
2272 | list_for_each_entry(gh, &gl->gl_waiters2, gh_list) { | |
2273 | error = dump_holder("Waiter2", gh); | |
2274 | if (error) | |
2275 | goto out; | |
2276 | } | |
2277 | list_for_each_entry(gh, &gl->gl_waiters3, gh_list) { | |
2278 | error = dump_holder("Waiter3", gh); | |
2279 | if (error) | |
2280 | goto out; | |
2281 | } | |
5c676f6d | 2282 | if (gl->gl_ops == &gfs2_inode_glops && gl->gl_object) { |
b3b94faa DT |
2283 | if (!test_bit(GLF_LOCK, &gl->gl_flags) && |
2284 | list_empty(&gl->gl_holders)) { | |
5c676f6d | 2285 | error = dump_inode(gl->gl_object); |
b3b94faa DT |
2286 | if (error) |
2287 | goto out; | |
2288 | } else { | |
2289 | error = -ENOBUFS; | |
d92a8d48 | 2290 | printk(KERN_INFO " Inode: busy\n"); |
b3b94faa DT |
2291 | } |
2292 | } | |
2293 | ||
2294 | error = 0; | |
2295 | ||
2296 | out: | |
2297 | spin_unlock(&gl->gl_spin); | |
2298 | ||
2299 | return error; | |
2300 | } | |
2301 | ||
2302 | /** | |
2303 | * gfs2_dump_lockstate - print out the current lockstate | |
2304 | * @sdp: the filesystem | |
2305 | * @ub: the buffer to copy the information into | |
2306 | * | |
2307 | * If @ub is NULL, dump the lockstate to the console. | |
2308 | * | |
2309 | */ | |
2310 | ||
2311 | int gfs2_dump_lockstate(struct gfs2_sbd *sdp) | |
2312 | { | |
2313 | struct gfs2_gl_hash_bucket *bucket; | |
2314 | struct gfs2_glock *gl; | |
2315 | unsigned int x; | |
2316 | int error = 0; | |
2317 | ||
2318 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) { | |
2319 | bucket = &sdp->sd_gl_hash[x]; | |
2320 | ||
2321 | read_lock(&bucket->hb_lock); | |
2322 | ||
2323 | list_for_each_entry(gl, &bucket->hb_list, gl_list) { | |
2324 | if (test_bit(GLF_PLUG, &gl->gl_flags)) | |
2325 | continue; | |
2326 | ||
2327 | error = dump_glock(gl); | |
2328 | if (error) | |
2329 | break; | |
2330 | } | |
2331 | ||
2332 | read_unlock(&bucket->hb_lock); | |
2333 | ||
2334 | if (error) | |
2335 | break; | |
2336 | } | |
2337 | ||
2338 | ||
2339 | return error; | |
2340 | } | |
2341 |