Commit | Line | Data |
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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/uaccess.h> |
22 | ||
23 | #include "gfs2.h" | |
5c676f6d SW |
24 | #include "lm_interface.h" |
25 | #include "incore.h" | |
b3b94faa DT |
26 | #include "glock.h" |
27 | #include "glops.h" | |
28 | #include "inode.h" | |
29 | #include "lm.h" | |
30 | #include "lops.h" | |
31 | #include "meta_io.h" | |
32 | #include "quota.h" | |
33 | #include "super.h" | |
5c676f6d | 34 | #include "util.h" |
b3b94faa DT |
35 | |
36 | /* Must be kept in sync with the beginning of struct gfs2_glock */ | |
37 | struct glock_plug { | |
38 | struct list_head gl_list; | |
39 | unsigned long gl_flags; | |
40 | }; | |
41 | ||
42 | struct greedy { | |
43 | struct gfs2_holder gr_gh; | |
44 | struct work_struct gr_work; | |
45 | }; | |
46 | ||
47 | typedef void (*glock_examiner) (struct gfs2_glock * gl); | |
48 | ||
08bc2dbc AB |
49 | static int gfs2_dump_lockstate(struct gfs2_sbd *sdp); |
50 | ||
b3b94faa DT |
51 | /** |
52 | * relaxed_state_ok - is a requested lock compatible with the current lock mode? | |
53 | * @actual: the current state of the lock | |
54 | * @requested: the lock state that was requested by the caller | |
55 | * @flags: the modifier flags passed in by the caller | |
56 | * | |
57 | * Returns: 1 if the locks are compatible, 0 otherwise | |
58 | */ | |
59 | ||
60 | static inline int relaxed_state_ok(unsigned int actual, unsigned requested, | |
61 | int flags) | |
62 | { | |
63 | if (actual == requested) | |
64 | return 1; | |
65 | ||
66 | if (flags & GL_EXACT) | |
67 | return 0; | |
68 | ||
69 | if (actual == LM_ST_EXCLUSIVE && requested == LM_ST_SHARED) | |
70 | return 1; | |
71 | ||
72 | if (actual != LM_ST_UNLOCKED && (flags & LM_FLAG_ANY)) | |
73 | return 1; | |
74 | ||
75 | return 0; | |
76 | } | |
77 | ||
78 | /** | |
79 | * gl_hash() - Turn glock number into hash bucket number | |
80 | * @lock: The glock number | |
81 | * | |
82 | * Returns: The number of the corresponding hash bucket | |
83 | */ | |
84 | ||
85 | static unsigned int gl_hash(struct lm_lockname *name) | |
86 | { | |
87 | unsigned int h; | |
88 | ||
89 | h = jhash(&name->ln_number, sizeof(uint64_t), 0); | |
90 | h = jhash(&name->ln_type, sizeof(unsigned int), h); | |
91 | h &= GFS2_GL_HASH_MASK; | |
92 | ||
93 | return h; | |
94 | } | |
95 | ||
96 | /** | |
97 | * glock_free() - Perform a few checks and then release struct gfs2_glock | |
98 | * @gl: The glock to release | |
99 | * | |
100 | * Also calls lock module to release its internal structure for this glock. | |
101 | * | |
102 | */ | |
103 | ||
104 | static void glock_free(struct gfs2_glock *gl) | |
105 | { | |
106 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
107 | struct inode *aspace = gl->gl_aspace; | |
108 | ||
109 | gfs2_lm_put_lock(sdp, gl->gl_lock); | |
110 | ||
111 | if (aspace) | |
112 | gfs2_aspace_put(aspace); | |
113 | ||
114 | kmem_cache_free(gfs2_glock_cachep, gl); | |
b3b94faa DT |
115 | } |
116 | ||
117 | /** | |
118 | * gfs2_glock_hold() - increment reference count on glock | |
119 | * @gl: The glock to hold | |
120 | * | |
121 | */ | |
122 | ||
123 | void gfs2_glock_hold(struct gfs2_glock *gl) | |
124 | { | |
125 | kref_get(&gl->gl_ref); | |
126 | } | |
127 | ||
128 | /* All work is done after the return from kref_put() so we | |
129 | can release the write_lock before the free. */ | |
130 | ||
131 | static void kill_glock(struct kref *kref) | |
132 | { | |
133 | struct gfs2_glock *gl = container_of(kref, struct gfs2_glock, gl_ref); | |
134 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
135 | ||
136 | gfs2_assert(sdp, gl->gl_state == LM_ST_UNLOCKED); | |
137 | gfs2_assert(sdp, list_empty(&gl->gl_reclaim)); | |
138 | gfs2_assert(sdp, list_empty(&gl->gl_holders)); | |
139 | gfs2_assert(sdp, list_empty(&gl->gl_waiters1)); | |
140 | gfs2_assert(sdp, list_empty(&gl->gl_waiters2)); | |
141 | gfs2_assert(sdp, list_empty(&gl->gl_waiters3)); | |
142 | } | |
143 | ||
144 | /** | |
145 | * gfs2_glock_put() - Decrement reference count on glock | |
146 | * @gl: The glock to put | |
147 | * | |
148 | */ | |
149 | ||
150 | int gfs2_glock_put(struct gfs2_glock *gl) | |
151 | { | |
152 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
153 | struct gfs2_gl_hash_bucket *bucket = gl->gl_bucket; | |
154 | int rv = 0; | |
155 | ||
f55ab26a | 156 | mutex_lock(&sdp->sd_invalidate_inodes_mutex); |
b3b94faa DT |
157 | |
158 | write_lock(&bucket->hb_lock); | |
159 | if (kref_put(&gl->gl_ref, kill_glock)) { | |
160 | list_del_init(&gl->gl_list); | |
161 | write_unlock(&bucket->hb_lock); | |
190562bd | 162 | BUG_ON(spin_is_locked(&gl->gl_spin)); |
b3b94faa DT |
163 | glock_free(gl); |
164 | rv = 1; | |
165 | goto out; | |
166 | } | |
167 | write_unlock(&bucket->hb_lock); | |
168 | out: | |
f55ab26a | 169 | mutex_unlock(&sdp->sd_invalidate_inodes_mutex); |
b3b94faa DT |
170 | return rv; |
171 | } | |
172 | ||
173 | /** | |
174 | * queue_empty - check to see if a glock's queue is empty | |
175 | * @gl: the glock | |
176 | * @head: the head of the queue to check | |
177 | * | |
178 | * This function protects the list in the event that a process already | |
179 | * has a holder on the list and is adding a second holder for itself. | |
180 | * The glmutex lock is what generally prevents processes from working | |
181 | * on the same glock at once, but the special case of adding a second | |
182 | * holder for yourself ("recursive" locking) doesn't involve locking | |
183 | * glmutex, making the spin lock necessary. | |
184 | * | |
185 | * Returns: 1 if the queue is empty | |
186 | */ | |
187 | ||
188 | static inline int queue_empty(struct gfs2_glock *gl, struct list_head *head) | |
189 | { | |
190 | int empty; | |
191 | spin_lock(&gl->gl_spin); | |
192 | empty = list_empty(head); | |
193 | spin_unlock(&gl->gl_spin); | |
194 | return empty; | |
195 | } | |
196 | ||
197 | /** | |
198 | * search_bucket() - Find struct gfs2_glock by lock number | |
199 | * @bucket: the bucket to search | |
200 | * @name: The lock name | |
201 | * | |
202 | * Returns: NULL, or the struct gfs2_glock with the requested number | |
203 | */ | |
204 | ||
205 | static struct gfs2_glock *search_bucket(struct gfs2_gl_hash_bucket *bucket, | |
206 | struct lm_lockname *name) | |
207 | { | |
208 | struct gfs2_glock *gl; | |
209 | ||
210 | list_for_each_entry(gl, &bucket->hb_list, gl_list) { | |
211 | if (test_bit(GLF_PLUG, &gl->gl_flags)) | |
212 | continue; | |
213 | if (!lm_name_equal(&gl->gl_name, name)) | |
214 | continue; | |
215 | ||
216 | kref_get(&gl->gl_ref); | |
217 | ||
218 | return gl; | |
219 | } | |
220 | ||
221 | return NULL; | |
222 | } | |
223 | ||
224 | /** | |
225 | * gfs2_glock_find() - Find glock by lock number | |
226 | * @sdp: The GFS2 superblock | |
227 | * @name: The lock name | |
228 | * | |
229 | * Returns: NULL, or the struct gfs2_glock with the requested number | |
230 | */ | |
231 | ||
08bc2dbc AB |
232 | static struct gfs2_glock *gfs2_glock_find(struct gfs2_sbd *sdp, |
233 | struct lm_lockname *name) | |
b3b94faa DT |
234 | { |
235 | struct gfs2_gl_hash_bucket *bucket = &sdp->sd_gl_hash[gl_hash(name)]; | |
236 | struct gfs2_glock *gl; | |
237 | ||
238 | read_lock(&bucket->hb_lock); | |
239 | gl = search_bucket(bucket, name); | |
240 | read_unlock(&bucket->hb_lock); | |
241 | ||
242 | return gl; | |
243 | } | |
244 | ||
245 | /** | |
246 | * gfs2_glock_get() - Get a glock, or create one if one doesn't exist | |
247 | * @sdp: The GFS2 superblock | |
248 | * @number: the lock number | |
249 | * @glops: The glock_operations to use | |
250 | * @create: If 0, don't create the glock if it doesn't exist | |
251 | * @glp: the glock is returned here | |
252 | * | |
253 | * This does not lock a glock, just finds/creates structures for one. | |
254 | * | |
255 | * Returns: errno | |
256 | */ | |
257 | ||
258 | int gfs2_glock_get(struct gfs2_sbd *sdp, uint64_t number, | |
259 | struct gfs2_glock_operations *glops, int create, | |
260 | struct gfs2_glock **glp) | |
261 | { | |
262 | struct lm_lockname name; | |
263 | struct gfs2_glock *gl, *tmp; | |
264 | struct gfs2_gl_hash_bucket *bucket; | |
265 | int error; | |
266 | ||
267 | name.ln_number = number; | |
268 | name.ln_type = glops->go_type; | |
269 | bucket = &sdp->sd_gl_hash[gl_hash(&name)]; | |
270 | ||
271 | read_lock(&bucket->hb_lock); | |
272 | gl = search_bucket(bucket, &name); | |
273 | read_unlock(&bucket->hb_lock); | |
274 | ||
275 | if (gl || !create) { | |
276 | *glp = gl; | |
277 | return 0; | |
278 | } | |
279 | ||
280 | gl = kmem_cache_alloc(gfs2_glock_cachep, GFP_KERNEL); | |
281 | if (!gl) | |
282 | return -ENOMEM; | |
283 | ||
284 | memset(gl, 0, sizeof(struct gfs2_glock)); | |
285 | ||
286 | INIT_LIST_HEAD(&gl->gl_list); | |
287 | gl->gl_name = name; | |
288 | kref_init(&gl->gl_ref); | |
289 | ||
290 | spin_lock_init(&gl->gl_spin); | |
291 | ||
292 | gl->gl_state = LM_ST_UNLOCKED; | |
293 | INIT_LIST_HEAD(&gl->gl_holders); | |
294 | INIT_LIST_HEAD(&gl->gl_waiters1); | |
295 | INIT_LIST_HEAD(&gl->gl_waiters2); | |
296 | INIT_LIST_HEAD(&gl->gl_waiters3); | |
297 | ||
298 | gl->gl_ops = glops; | |
299 | ||
300 | gl->gl_bucket = bucket; | |
301 | INIT_LIST_HEAD(&gl->gl_reclaim); | |
302 | ||
303 | gl->gl_sbd = sdp; | |
304 | ||
305 | lops_init_le(&gl->gl_le, &gfs2_glock_lops); | |
306 | INIT_LIST_HEAD(&gl->gl_ail_list); | |
307 | ||
308 | /* If this glock protects actual on-disk data or metadata blocks, | |
309 | create a VFS inode to manage the pages/buffers holding them. */ | |
310 | if (glops == &gfs2_inode_glops || | |
311 | glops == &gfs2_rgrp_glops || | |
312 | glops == &gfs2_meta_glops) { | |
313 | gl->gl_aspace = gfs2_aspace_get(sdp); | |
314 | if (!gl->gl_aspace) { | |
315 | error = -ENOMEM; | |
316 | goto fail; | |
317 | } | |
318 | } | |
319 | ||
320 | error = gfs2_lm_get_lock(sdp, &name, &gl->gl_lock); | |
321 | if (error) | |
322 | goto fail_aspace; | |
323 | ||
b3b94faa DT |
324 | write_lock(&bucket->hb_lock); |
325 | tmp = search_bucket(bucket, &name); | |
326 | if (tmp) { | |
327 | write_unlock(&bucket->hb_lock); | |
328 | glock_free(gl); | |
329 | gl = tmp; | |
330 | } else { | |
331 | list_add_tail(&gl->gl_list, &bucket->hb_list); | |
332 | write_unlock(&bucket->hb_lock); | |
333 | } | |
334 | ||
335 | *glp = gl; | |
336 | ||
337 | return 0; | |
338 | ||
339 | fail_aspace: | |
340 | if (gl->gl_aspace) | |
341 | gfs2_aspace_put(gl->gl_aspace); | |
342 | ||
343 | fail: | |
344 | kmem_cache_free(gfs2_glock_cachep, gl); | |
345 | ||
346 | return error; | |
347 | } | |
348 | ||
349 | /** | |
350 | * gfs2_holder_init - initialize a struct gfs2_holder in the default way | |
351 | * @gl: the glock | |
352 | * @state: the state we're requesting | |
353 | * @flags: the modifier flags | |
354 | * @gh: the holder structure | |
355 | * | |
356 | */ | |
357 | ||
190562bd | 358 | void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags, |
b3b94faa DT |
359 | struct gfs2_holder *gh) |
360 | { | |
361 | INIT_LIST_HEAD(&gh->gh_list); | |
362 | gh->gh_gl = gl; | |
d0dc80db | 363 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
190562bd | 364 | gh->gh_owner = current; |
b3b94faa DT |
365 | gh->gh_state = state; |
366 | gh->gh_flags = flags; | |
367 | gh->gh_error = 0; | |
368 | gh->gh_iflags = 0; | |
369 | init_completion(&gh->gh_wait); | |
370 | ||
371 | if (gh->gh_state == LM_ST_EXCLUSIVE) | |
372 | gh->gh_flags |= GL_LOCAL_EXCL; | |
373 | ||
374 | gfs2_glock_hold(gl); | |
375 | } | |
376 | ||
377 | /** | |
378 | * gfs2_holder_reinit - reinitialize a struct gfs2_holder so we can requeue it | |
379 | * @state: the state we're requesting | |
380 | * @flags: the modifier flags | |
381 | * @gh: the holder structure | |
382 | * | |
383 | * Don't mess with the glock. | |
384 | * | |
385 | */ | |
386 | ||
190562bd | 387 | void gfs2_holder_reinit(unsigned int state, unsigned flags, struct gfs2_holder *gh) |
b3b94faa DT |
388 | { |
389 | gh->gh_state = state; | |
579b78a4 | 390 | gh->gh_flags = flags; |
b3b94faa DT |
391 | if (gh->gh_state == LM_ST_EXCLUSIVE) |
392 | gh->gh_flags |= GL_LOCAL_EXCL; | |
393 | ||
394 | gh->gh_iflags &= 1 << HIF_ALLOCED; | |
d0dc80db | 395 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
b3b94faa DT |
396 | } |
397 | ||
398 | /** | |
399 | * gfs2_holder_uninit - uninitialize a holder structure (drop glock reference) | |
400 | * @gh: the holder structure | |
401 | * | |
402 | */ | |
403 | ||
404 | void gfs2_holder_uninit(struct gfs2_holder *gh) | |
405 | { | |
406 | gfs2_glock_put(gh->gh_gl); | |
407 | gh->gh_gl = NULL; | |
d0dc80db | 408 | gh->gh_ip = 0; |
b3b94faa DT |
409 | } |
410 | ||
411 | /** | |
412 | * gfs2_holder_get - get a struct gfs2_holder structure | |
413 | * @gl: the glock | |
414 | * @state: the state we're requesting | |
415 | * @flags: the modifier flags | |
416 | * @gfp_flags: __GFP_NOFAIL | |
417 | * | |
418 | * Figure out how big an impact this function has. Either: | |
419 | * 1) Replace it with a cache of structures hanging off the struct gfs2_sbd | |
420 | * 2) Leave it like it is | |
421 | * | |
422 | * Returns: the holder structure, NULL on ENOMEM | |
423 | */ | |
424 | ||
08bc2dbc AB |
425 | static struct gfs2_holder *gfs2_holder_get(struct gfs2_glock *gl, |
426 | unsigned int state, | |
427 | int flags, gfp_t gfp_flags) | |
b3b94faa DT |
428 | { |
429 | struct gfs2_holder *gh; | |
430 | ||
431 | gh = kmalloc(sizeof(struct gfs2_holder), gfp_flags); | |
432 | if (!gh) | |
433 | return NULL; | |
434 | ||
435 | gfs2_holder_init(gl, state, flags, gh); | |
436 | set_bit(HIF_ALLOCED, &gh->gh_iflags); | |
d0dc80db | 437 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
b3b94faa DT |
438 | return gh; |
439 | } | |
440 | ||
441 | /** | |
442 | * gfs2_holder_put - get rid of a struct gfs2_holder structure | |
443 | * @gh: the holder structure | |
444 | * | |
445 | */ | |
446 | ||
08bc2dbc | 447 | static void gfs2_holder_put(struct gfs2_holder *gh) |
b3b94faa DT |
448 | { |
449 | gfs2_holder_uninit(gh); | |
450 | kfree(gh); | |
451 | } | |
452 | ||
b3b94faa DT |
453 | /** |
454 | * rq_mutex - process a mutex request in the queue | |
455 | * @gh: the glock holder | |
456 | * | |
457 | * Returns: 1 if the queue is blocked | |
458 | */ | |
459 | ||
460 | static int rq_mutex(struct gfs2_holder *gh) | |
461 | { | |
462 | struct gfs2_glock *gl = gh->gh_gl; | |
463 | ||
464 | list_del_init(&gh->gh_list); | |
465 | /* gh->gh_error never examined. */ | |
466 | set_bit(GLF_LOCK, &gl->gl_flags); | |
467 | complete(&gh->gh_wait); | |
468 | ||
469 | return 1; | |
470 | } | |
471 | ||
472 | /** | |
473 | * rq_promote - process a promote request in the queue | |
474 | * @gh: the glock holder | |
475 | * | |
476 | * Acquire a new inter-node lock, or change a lock state to more restrictive. | |
477 | * | |
478 | * Returns: 1 if the queue is blocked | |
479 | */ | |
480 | ||
481 | static int rq_promote(struct gfs2_holder *gh) | |
482 | { | |
483 | struct gfs2_glock *gl = gh->gh_gl; | |
484 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
485 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
b3b94faa DT |
486 | |
487 | if (!relaxed_state_ok(gl->gl_state, gh->gh_state, gh->gh_flags)) { | |
488 | if (list_empty(&gl->gl_holders)) { | |
489 | gl->gl_req_gh = gh; | |
490 | set_bit(GLF_LOCK, &gl->gl_flags); | |
491 | spin_unlock(&gl->gl_spin); | |
492 | ||
493 | if (atomic_read(&sdp->sd_reclaim_count) > | |
494 | gfs2_tune_get(sdp, gt_reclaim_limit) && | |
495 | !(gh->gh_flags & LM_FLAG_PRIORITY)) { | |
496 | gfs2_reclaim_glock(sdp); | |
497 | gfs2_reclaim_glock(sdp); | |
498 | } | |
499 | ||
500 | glops->go_xmote_th(gl, gh->gh_state, | |
501 | gh->gh_flags); | |
502 | ||
503 | spin_lock(&gl->gl_spin); | |
504 | } | |
505 | return 1; | |
506 | } | |
507 | ||
508 | if (list_empty(&gl->gl_holders)) { | |
509 | set_bit(HIF_FIRST, &gh->gh_iflags); | |
510 | set_bit(GLF_LOCK, &gl->gl_flags); | |
b3b94faa DT |
511 | } else { |
512 | struct gfs2_holder *next_gh; | |
513 | if (gh->gh_flags & GL_LOCAL_EXCL) | |
514 | return 1; | |
515 | next_gh = list_entry(gl->gl_holders.next, struct gfs2_holder, | |
516 | gh_list); | |
517 | if (next_gh->gh_flags & GL_LOCAL_EXCL) | |
518 | return 1; | |
b3b94faa DT |
519 | } |
520 | ||
521 | list_move_tail(&gh->gh_list, &gl->gl_holders); | |
522 | gh->gh_error = 0; | |
523 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
524 | ||
b3b94faa DT |
525 | complete(&gh->gh_wait); |
526 | ||
527 | return 0; | |
528 | } | |
529 | ||
530 | /** | |
531 | * rq_demote - process a demote request in the queue | |
532 | * @gh: the glock holder | |
533 | * | |
534 | * Returns: 1 if the queue is blocked | |
535 | */ | |
536 | ||
537 | static int rq_demote(struct gfs2_holder *gh) | |
538 | { | |
539 | struct gfs2_glock *gl = gh->gh_gl; | |
540 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
541 | ||
542 | if (!list_empty(&gl->gl_holders)) | |
543 | return 1; | |
544 | ||
545 | if (gl->gl_state == gh->gh_state || gl->gl_state == LM_ST_UNLOCKED) { | |
546 | list_del_init(&gh->gh_list); | |
547 | gh->gh_error = 0; | |
548 | spin_unlock(&gl->gl_spin); | |
549 | if (test_bit(HIF_DEALLOC, &gh->gh_iflags)) | |
550 | gfs2_holder_put(gh); | |
551 | else | |
552 | complete(&gh->gh_wait); | |
553 | spin_lock(&gl->gl_spin); | |
554 | } else { | |
555 | gl->gl_req_gh = gh; | |
556 | set_bit(GLF_LOCK, &gl->gl_flags); | |
557 | spin_unlock(&gl->gl_spin); | |
558 | ||
559 | if (gh->gh_state == LM_ST_UNLOCKED || | |
560 | gl->gl_state != LM_ST_EXCLUSIVE) | |
561 | glops->go_drop_th(gl); | |
562 | else | |
563 | glops->go_xmote_th(gl, gh->gh_state, gh->gh_flags); | |
564 | ||
565 | spin_lock(&gl->gl_spin); | |
566 | } | |
567 | ||
568 | return 0; | |
569 | } | |
570 | ||
571 | /** | |
572 | * rq_greedy - process a queued request to drop greedy status | |
573 | * @gh: the glock holder | |
574 | * | |
575 | * Returns: 1 if the queue is blocked | |
576 | */ | |
577 | ||
578 | static int rq_greedy(struct gfs2_holder *gh) | |
579 | { | |
580 | struct gfs2_glock *gl = gh->gh_gl; | |
581 | ||
582 | list_del_init(&gh->gh_list); | |
583 | /* gh->gh_error never examined. */ | |
584 | clear_bit(GLF_GREEDY, &gl->gl_flags); | |
585 | spin_unlock(&gl->gl_spin); | |
586 | ||
587 | gfs2_holder_uninit(gh); | |
588 | kfree(container_of(gh, struct greedy, gr_gh)); | |
589 | ||
590 | spin_lock(&gl->gl_spin); | |
591 | ||
592 | return 0; | |
593 | } | |
594 | ||
595 | /** | |
596 | * run_queue - process holder structures on a glock | |
597 | * @gl: the glock | |
598 | * | |
599 | */ | |
b3b94faa DT |
600 | static void run_queue(struct gfs2_glock *gl) |
601 | { | |
602 | struct gfs2_holder *gh; | |
603 | int blocked = 1; | |
604 | ||
605 | for (;;) { | |
606 | if (test_bit(GLF_LOCK, &gl->gl_flags)) | |
607 | break; | |
608 | ||
609 | if (!list_empty(&gl->gl_waiters1)) { | |
610 | gh = list_entry(gl->gl_waiters1.next, | |
611 | struct gfs2_holder, gh_list); | |
612 | ||
613 | if (test_bit(HIF_MUTEX, &gh->gh_iflags)) | |
614 | blocked = rq_mutex(gh); | |
615 | else | |
616 | gfs2_assert_warn(gl->gl_sbd, 0); | |
617 | ||
618 | } else if (!list_empty(&gl->gl_waiters2) && | |
619 | !test_bit(GLF_SKIP_WAITERS2, &gl->gl_flags)) { | |
620 | gh = list_entry(gl->gl_waiters2.next, | |
621 | struct gfs2_holder, gh_list); | |
622 | ||
623 | if (test_bit(HIF_DEMOTE, &gh->gh_iflags)) | |
624 | blocked = rq_demote(gh); | |
625 | else if (test_bit(HIF_GREEDY, &gh->gh_iflags)) | |
626 | blocked = rq_greedy(gh); | |
627 | else | |
628 | gfs2_assert_warn(gl->gl_sbd, 0); | |
629 | ||
630 | } else if (!list_empty(&gl->gl_waiters3)) { | |
631 | gh = list_entry(gl->gl_waiters3.next, | |
632 | struct gfs2_holder, gh_list); | |
633 | ||
634 | if (test_bit(HIF_PROMOTE, &gh->gh_iflags)) | |
635 | blocked = rq_promote(gh); | |
636 | else | |
637 | gfs2_assert_warn(gl->gl_sbd, 0); | |
638 | ||
639 | } else | |
640 | break; | |
641 | ||
642 | if (blocked) | |
643 | break; | |
644 | } | |
645 | } | |
646 | ||
647 | /** | |
648 | * gfs2_glmutex_lock - acquire a local lock on a glock | |
649 | * @gl: the glock | |
650 | * | |
651 | * Gives caller exclusive access to manipulate a glock structure. | |
652 | */ | |
653 | ||
654 | void gfs2_glmutex_lock(struct gfs2_glock *gl) | |
655 | { | |
656 | struct gfs2_holder gh; | |
657 | ||
658 | gfs2_holder_init(gl, 0, 0, &gh); | |
659 | set_bit(HIF_MUTEX, &gh.gh_iflags); | |
660 | ||
661 | spin_lock(&gl->gl_spin); | |
662 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) | |
663 | list_add_tail(&gh.gh_list, &gl->gl_waiters1); | |
664 | else | |
665 | complete(&gh.gh_wait); | |
666 | spin_unlock(&gl->gl_spin); | |
667 | ||
668 | wait_for_completion(&gh.gh_wait); | |
669 | gfs2_holder_uninit(&gh); | |
670 | } | |
671 | ||
672 | /** | |
673 | * gfs2_glmutex_trylock - try to acquire a local lock on a glock | |
674 | * @gl: the glock | |
675 | * | |
676 | * Returns: 1 if the glock is acquired | |
677 | */ | |
678 | ||
08bc2dbc | 679 | static int gfs2_glmutex_trylock(struct gfs2_glock *gl) |
b3b94faa DT |
680 | { |
681 | int acquired = 1; | |
682 | ||
683 | spin_lock(&gl->gl_spin); | |
684 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) | |
685 | acquired = 0; | |
686 | spin_unlock(&gl->gl_spin); | |
687 | ||
688 | return acquired; | |
689 | } | |
690 | ||
691 | /** | |
692 | * gfs2_glmutex_unlock - release a local lock on a glock | |
693 | * @gl: the glock | |
694 | * | |
695 | */ | |
696 | ||
697 | void gfs2_glmutex_unlock(struct gfs2_glock *gl) | |
698 | { | |
699 | spin_lock(&gl->gl_spin); | |
700 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
701 | run_queue(gl); | |
190562bd | 702 | BUG_ON(!spin_is_locked(&gl->gl_spin)); |
b3b94faa DT |
703 | spin_unlock(&gl->gl_spin); |
704 | } | |
705 | ||
706 | /** | |
707 | * handle_callback - add a demote request to a lock's queue | |
708 | * @gl: the glock | |
709 | * @state: the state the caller wants us to change to | |
710 | * | |
711 | */ | |
712 | ||
713 | static void handle_callback(struct gfs2_glock *gl, unsigned int state) | |
714 | { | |
715 | struct gfs2_holder *gh, *new_gh = NULL; | |
716 | ||
717 | restart: | |
718 | spin_lock(&gl->gl_spin); | |
719 | ||
720 | list_for_each_entry(gh, &gl->gl_waiters2, gh_list) { | |
721 | if (test_bit(HIF_DEMOTE, &gh->gh_iflags) && | |
722 | gl->gl_req_gh != gh) { | |
723 | if (gh->gh_state != state) | |
724 | gh->gh_state = LM_ST_UNLOCKED; | |
725 | goto out; | |
726 | } | |
727 | } | |
728 | ||
729 | if (new_gh) { | |
730 | list_add_tail(&new_gh->gh_list, &gl->gl_waiters2); | |
731 | new_gh = NULL; | |
732 | } else { | |
733 | spin_unlock(&gl->gl_spin); | |
734 | ||
579b78a4 | 735 | new_gh = gfs2_holder_get(gl, state, LM_FLAG_TRY, |
b3b94faa DT |
736 | GFP_KERNEL | __GFP_NOFAIL), |
737 | set_bit(HIF_DEMOTE, &new_gh->gh_iflags); | |
738 | set_bit(HIF_DEALLOC, &new_gh->gh_iflags); | |
739 | ||
740 | goto restart; | |
741 | } | |
742 | ||
743 | out: | |
744 | spin_unlock(&gl->gl_spin); | |
745 | ||
746 | if (new_gh) | |
747 | gfs2_holder_put(new_gh); | |
748 | } | |
749 | ||
750 | /** | |
751 | * state_change - record that the glock is now in a different state | |
752 | * @gl: the glock | |
753 | * @new_state the new state | |
754 | * | |
755 | */ | |
756 | ||
757 | static void state_change(struct gfs2_glock *gl, unsigned int new_state) | |
758 | { | |
b3b94faa DT |
759 | int held1, held2; |
760 | ||
761 | held1 = (gl->gl_state != LM_ST_UNLOCKED); | |
762 | held2 = (new_state != LM_ST_UNLOCKED); | |
763 | ||
764 | if (held1 != held2) { | |
6a6b3d01 | 765 | if (held2) |
b3b94faa | 766 | gfs2_glock_hold(gl); |
6a6b3d01 | 767 | else |
b3b94faa | 768 | gfs2_glock_put(gl); |
b3b94faa DT |
769 | } |
770 | ||
771 | gl->gl_state = new_state; | |
772 | } | |
773 | ||
774 | /** | |
775 | * xmote_bh - Called after the lock module is done acquiring a lock | |
776 | * @gl: The glock in question | |
777 | * @ret: the int returned from the lock module | |
778 | * | |
779 | */ | |
780 | ||
781 | static void xmote_bh(struct gfs2_glock *gl, unsigned int ret) | |
782 | { | |
783 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
784 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
785 | struct gfs2_holder *gh = gl->gl_req_gh; | |
786 | int prev_state = gl->gl_state; | |
787 | int op_done = 1; | |
788 | ||
789 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
790 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
791 | gfs2_assert_warn(sdp, !(ret & LM_OUT_ASYNC)); | |
792 | ||
793 | state_change(gl, ret & LM_OUT_ST_MASK); | |
794 | ||
795 | if (prev_state != LM_ST_UNLOCKED && !(ret & LM_OUT_CACHEABLE)) { | |
796 | if (glops->go_inval) | |
797 | glops->go_inval(gl, DIO_METADATA | DIO_DATA); | |
798 | } else if (gl->gl_state == LM_ST_DEFERRED) { | |
799 | /* We might not want to do this here. | |
800 | Look at moving to the inode glops. */ | |
801 | if (glops->go_inval) | |
802 | glops->go_inval(gl, DIO_DATA); | |
803 | } | |
804 | ||
805 | /* Deal with each possible exit condition */ | |
806 | ||
807 | if (!gh) | |
808 | gl->gl_stamp = jiffies; | |
809 | ||
810 | else if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) { | |
811 | spin_lock(&gl->gl_spin); | |
812 | list_del_init(&gh->gh_list); | |
813 | gh->gh_error = -EIO; | |
b3b94faa DT |
814 | spin_unlock(&gl->gl_spin); |
815 | ||
816 | } else if (test_bit(HIF_DEMOTE, &gh->gh_iflags)) { | |
817 | spin_lock(&gl->gl_spin); | |
818 | list_del_init(&gh->gh_list); | |
819 | if (gl->gl_state == gh->gh_state || | |
820 | gl->gl_state == LM_ST_UNLOCKED) | |
821 | gh->gh_error = 0; | |
822 | else { | |
823 | if (gfs2_assert_warn(sdp, gh->gh_flags & | |
824 | (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) == -1) | |
825 | fs_warn(sdp, "ret = 0x%.8X\n", ret); | |
826 | gh->gh_error = GLR_TRYFAILED; | |
827 | } | |
828 | spin_unlock(&gl->gl_spin); | |
829 | ||
830 | if (ret & LM_OUT_CANCELED) | |
831 | handle_callback(gl, LM_ST_UNLOCKED); /* Lame */ | |
832 | ||
833 | } else if (ret & LM_OUT_CANCELED) { | |
834 | spin_lock(&gl->gl_spin); | |
835 | list_del_init(&gh->gh_list); | |
836 | gh->gh_error = GLR_CANCELED; | |
b3b94faa DT |
837 | spin_unlock(&gl->gl_spin); |
838 | ||
839 | } else if (relaxed_state_ok(gl->gl_state, gh->gh_state, gh->gh_flags)) { | |
840 | spin_lock(&gl->gl_spin); | |
841 | list_move_tail(&gh->gh_list, &gl->gl_holders); | |
842 | gh->gh_error = 0; | |
843 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
844 | spin_unlock(&gl->gl_spin); | |
845 | ||
846 | set_bit(HIF_FIRST, &gh->gh_iflags); | |
847 | ||
848 | op_done = 0; | |
849 | ||
850 | } else if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { | |
851 | spin_lock(&gl->gl_spin); | |
852 | list_del_init(&gh->gh_list); | |
853 | gh->gh_error = GLR_TRYFAILED; | |
b3b94faa DT |
854 | spin_unlock(&gl->gl_spin); |
855 | ||
856 | } else { | |
857 | if (gfs2_assert_withdraw(sdp, 0) == -1) | |
858 | fs_err(sdp, "ret = 0x%.8X\n", ret); | |
859 | } | |
860 | ||
861 | if (glops->go_xmote_bh) | |
862 | glops->go_xmote_bh(gl); | |
863 | ||
864 | if (op_done) { | |
865 | spin_lock(&gl->gl_spin); | |
866 | gl->gl_req_gh = NULL; | |
867 | gl->gl_req_bh = NULL; | |
868 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
869 | run_queue(gl); | |
870 | spin_unlock(&gl->gl_spin); | |
871 | } | |
872 | ||
873 | gfs2_glock_put(gl); | |
874 | ||
875 | if (gh) { | |
876 | if (test_bit(HIF_DEALLOC, &gh->gh_iflags)) | |
877 | gfs2_holder_put(gh); | |
878 | else | |
879 | complete(&gh->gh_wait); | |
880 | } | |
881 | } | |
882 | ||
883 | /** | |
884 | * gfs2_glock_xmote_th - Call into the lock module to acquire or change a glock | |
885 | * @gl: The glock in question | |
886 | * @state: the requested state | |
887 | * @flags: modifier flags to the lock call | |
888 | * | |
889 | */ | |
890 | ||
891 | void gfs2_glock_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags) | |
892 | { | |
893 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
894 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
895 | int lck_flags = flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB | | |
896 | LM_FLAG_NOEXP | LM_FLAG_ANY | | |
897 | LM_FLAG_PRIORITY); | |
898 | unsigned int lck_ret; | |
899 | ||
900 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
901 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
902 | gfs2_assert_warn(sdp, state != LM_ST_UNLOCKED); | |
903 | gfs2_assert_warn(sdp, state != gl->gl_state); | |
904 | ||
905 | if (gl->gl_state == LM_ST_EXCLUSIVE) { | |
906 | if (glops->go_sync) | |
907 | glops->go_sync(gl, | |
908 | DIO_METADATA | DIO_DATA | DIO_RELEASE); | |
909 | } | |
910 | ||
911 | gfs2_glock_hold(gl); | |
912 | gl->gl_req_bh = xmote_bh; | |
913 | ||
b3b94faa DT |
914 | lck_ret = gfs2_lm_lock(sdp, gl->gl_lock, gl->gl_state, state, |
915 | lck_flags); | |
916 | ||
917 | if (gfs2_assert_withdraw(sdp, !(lck_ret & LM_OUT_ERROR))) | |
918 | return; | |
919 | ||
920 | if (lck_ret & LM_OUT_ASYNC) | |
921 | gfs2_assert_warn(sdp, lck_ret == LM_OUT_ASYNC); | |
922 | else | |
923 | xmote_bh(gl, lck_ret); | |
924 | } | |
925 | ||
926 | /** | |
927 | * drop_bh - Called after a lock module unlock completes | |
928 | * @gl: the glock | |
929 | * @ret: the return status | |
930 | * | |
931 | * Doesn't wake up the process waiting on the struct gfs2_holder (if any) | |
932 | * Doesn't drop the reference on the glock the top half took out | |
933 | * | |
934 | */ | |
935 | ||
936 | static void drop_bh(struct gfs2_glock *gl, unsigned int ret) | |
937 | { | |
938 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
939 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
940 | struct gfs2_holder *gh = gl->gl_req_gh; | |
941 | ||
942 | clear_bit(GLF_PREFETCH, &gl->gl_flags); | |
943 | ||
944 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
945 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
946 | gfs2_assert_warn(sdp, !ret); | |
947 | ||
948 | state_change(gl, LM_ST_UNLOCKED); | |
949 | ||
950 | if (glops->go_inval) | |
951 | glops->go_inval(gl, DIO_METADATA | DIO_DATA); | |
952 | ||
953 | if (gh) { | |
954 | spin_lock(&gl->gl_spin); | |
955 | list_del_init(&gh->gh_list); | |
956 | gh->gh_error = 0; | |
957 | spin_unlock(&gl->gl_spin); | |
958 | } | |
959 | ||
960 | if (glops->go_drop_bh) | |
961 | glops->go_drop_bh(gl); | |
962 | ||
963 | spin_lock(&gl->gl_spin); | |
964 | gl->gl_req_gh = NULL; | |
965 | gl->gl_req_bh = NULL; | |
966 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
967 | run_queue(gl); | |
968 | spin_unlock(&gl->gl_spin); | |
969 | ||
970 | gfs2_glock_put(gl); | |
971 | ||
972 | if (gh) { | |
973 | if (test_bit(HIF_DEALLOC, &gh->gh_iflags)) | |
974 | gfs2_holder_put(gh); | |
975 | else | |
976 | complete(&gh->gh_wait); | |
977 | } | |
978 | } | |
979 | ||
980 | /** | |
981 | * gfs2_glock_drop_th - call into the lock module to unlock a lock | |
982 | * @gl: the glock | |
983 | * | |
984 | */ | |
985 | ||
986 | void gfs2_glock_drop_th(struct gfs2_glock *gl) | |
987 | { | |
988 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
989 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
990 | unsigned int ret; | |
991 | ||
992 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
993 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
994 | gfs2_assert_warn(sdp, gl->gl_state != LM_ST_UNLOCKED); | |
995 | ||
996 | if (gl->gl_state == LM_ST_EXCLUSIVE) { | |
997 | if (glops->go_sync) | |
998 | glops->go_sync(gl, | |
999 | DIO_METADATA | DIO_DATA | DIO_RELEASE); | |
1000 | } | |
1001 | ||
1002 | gfs2_glock_hold(gl); | |
1003 | gl->gl_req_bh = drop_bh; | |
1004 | ||
b3b94faa DT |
1005 | ret = gfs2_lm_unlock(sdp, gl->gl_lock, gl->gl_state); |
1006 | ||
1007 | if (gfs2_assert_withdraw(sdp, !(ret & LM_OUT_ERROR))) | |
1008 | return; | |
1009 | ||
1010 | if (!ret) | |
1011 | drop_bh(gl, ret); | |
1012 | else | |
1013 | gfs2_assert_warn(sdp, ret == LM_OUT_ASYNC); | |
1014 | } | |
1015 | ||
1016 | /** | |
1017 | * do_cancels - cancel requests for locks stuck waiting on an expire flag | |
1018 | * @gh: the LM_FLAG_PRIORITY holder waiting to acquire the lock | |
1019 | * | |
1020 | * Don't cancel GL_NOCANCEL requests. | |
1021 | */ | |
1022 | ||
1023 | static void do_cancels(struct gfs2_holder *gh) | |
1024 | { | |
1025 | struct gfs2_glock *gl = gh->gh_gl; | |
1026 | ||
1027 | spin_lock(&gl->gl_spin); | |
1028 | ||
1029 | while (gl->gl_req_gh != gh && | |
1030 | !test_bit(HIF_HOLDER, &gh->gh_iflags) && | |
1031 | !list_empty(&gh->gh_list)) { | |
1032 | if (gl->gl_req_bh && | |
1033 | !(gl->gl_req_gh && | |
1034 | (gl->gl_req_gh->gh_flags & GL_NOCANCEL))) { | |
1035 | spin_unlock(&gl->gl_spin); | |
1036 | gfs2_lm_cancel(gl->gl_sbd, gl->gl_lock); | |
1037 | msleep(100); | |
1038 | spin_lock(&gl->gl_spin); | |
1039 | } else { | |
1040 | spin_unlock(&gl->gl_spin); | |
1041 | msleep(100); | |
1042 | spin_lock(&gl->gl_spin); | |
1043 | } | |
1044 | } | |
1045 | ||
1046 | spin_unlock(&gl->gl_spin); | |
1047 | } | |
1048 | ||
1049 | /** | |
1050 | * glock_wait_internal - wait on a glock acquisition | |
1051 | * @gh: the glock holder | |
1052 | * | |
1053 | * Returns: 0 on success | |
1054 | */ | |
1055 | ||
1056 | static int glock_wait_internal(struct gfs2_holder *gh) | |
1057 | { | |
1058 | struct gfs2_glock *gl = gh->gh_gl; | |
1059 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1060 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
1061 | ||
1062 | if (test_bit(HIF_ABORTED, &gh->gh_iflags)) | |
1063 | return -EIO; | |
1064 | ||
1065 | if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { | |
1066 | spin_lock(&gl->gl_spin); | |
1067 | if (gl->gl_req_gh != gh && | |
1068 | !test_bit(HIF_HOLDER, &gh->gh_iflags) && | |
1069 | !list_empty(&gh->gh_list)) { | |
1070 | list_del_init(&gh->gh_list); | |
1071 | gh->gh_error = GLR_TRYFAILED; | |
b3b94faa DT |
1072 | run_queue(gl); |
1073 | spin_unlock(&gl->gl_spin); | |
1074 | return gh->gh_error; | |
1075 | } | |
1076 | spin_unlock(&gl->gl_spin); | |
1077 | } | |
1078 | ||
1079 | if (gh->gh_flags & LM_FLAG_PRIORITY) | |
1080 | do_cancels(gh); | |
1081 | ||
1082 | wait_for_completion(&gh->gh_wait); | |
1083 | ||
1084 | if (gh->gh_error) | |
1085 | return gh->gh_error; | |
1086 | ||
1087 | gfs2_assert_withdraw(sdp, test_bit(HIF_HOLDER, &gh->gh_iflags)); | |
1088 | gfs2_assert_withdraw(sdp, relaxed_state_ok(gl->gl_state, | |
1089 | gh->gh_state, | |
1090 | gh->gh_flags)); | |
1091 | ||
1092 | if (test_bit(HIF_FIRST, &gh->gh_iflags)) { | |
1093 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
1094 | ||
1095 | if (glops->go_lock) { | |
1096 | gh->gh_error = glops->go_lock(gh); | |
1097 | if (gh->gh_error) { | |
1098 | spin_lock(&gl->gl_spin); | |
1099 | list_del_init(&gh->gh_list); | |
b3b94faa DT |
1100 | spin_unlock(&gl->gl_spin); |
1101 | } | |
1102 | } | |
1103 | ||
1104 | spin_lock(&gl->gl_spin); | |
1105 | gl->gl_req_gh = NULL; | |
1106 | gl->gl_req_bh = NULL; | |
1107 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
b3b94faa DT |
1108 | run_queue(gl); |
1109 | spin_unlock(&gl->gl_spin); | |
1110 | } | |
1111 | ||
1112 | return gh->gh_error; | |
1113 | } | |
1114 | ||
1115 | static inline struct gfs2_holder * | |
1116 | find_holder_by_owner(struct list_head *head, struct task_struct *owner) | |
1117 | { | |
1118 | struct gfs2_holder *gh; | |
1119 | ||
1120 | list_for_each_entry(gh, head, gh_list) { | |
1121 | if (gh->gh_owner == owner) | |
1122 | return gh; | |
1123 | } | |
1124 | ||
1125 | return NULL; | |
1126 | } | |
1127 | ||
b3b94faa DT |
1128 | /** |
1129 | * add_to_queue - Add a holder to the wait queue (but look for recursion) | |
1130 | * @gh: the holder structure to add | |
1131 | * | |
1132 | */ | |
1133 | ||
1134 | static void add_to_queue(struct gfs2_holder *gh) | |
1135 | { | |
1136 | struct gfs2_glock *gl = gh->gh_gl; | |
1137 | struct gfs2_holder *existing; | |
1138 | ||
190562bd SW |
1139 | BUG_ON(!gh->gh_owner); |
1140 | ||
b3b94faa DT |
1141 | existing = find_holder_by_owner(&gl->gl_holders, gh->gh_owner); |
1142 | if (existing) { | |
5965b1f4 SW |
1143 | print_symbol(KERN_WARNING "original: %s\n", existing->gh_ip); |
1144 | print_symbol(KERN_WARNING "new: %s\n", gh->gh_ip); | |
1145 | BUG(); | |
b3b94faa DT |
1146 | } |
1147 | ||
1148 | existing = find_holder_by_owner(&gl->gl_waiters3, gh->gh_owner); | |
1149 | if (existing) { | |
5965b1f4 SW |
1150 | print_symbol(KERN_WARNING "original: %s\n", existing->gh_ip); |
1151 | print_symbol(KERN_WARNING "new: %s\n", gh->gh_ip); | |
1152 | BUG(); | |
b3b94faa DT |
1153 | } |
1154 | ||
b3b94faa DT |
1155 | if (gh->gh_flags & LM_FLAG_PRIORITY) |
1156 | list_add(&gh->gh_list, &gl->gl_waiters3); | |
1157 | else | |
1158 | list_add_tail(&gh->gh_list, &gl->gl_waiters3); | |
1159 | } | |
1160 | ||
1161 | /** | |
1162 | * gfs2_glock_nq - enqueue a struct gfs2_holder onto a glock (acquire a glock) | |
1163 | * @gh: the holder structure | |
1164 | * | |
1165 | * if (gh->gh_flags & GL_ASYNC), this never returns an error | |
1166 | * | |
1167 | * Returns: 0, GLR_TRYFAILED, or errno on failure | |
1168 | */ | |
1169 | ||
1170 | int gfs2_glock_nq(struct gfs2_holder *gh) | |
1171 | { | |
1172 | struct gfs2_glock *gl = gh->gh_gl; | |
1173 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1174 | int error = 0; | |
1175 | ||
b3b94faa DT |
1176 | restart: |
1177 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) { | |
1178 | set_bit(HIF_ABORTED, &gh->gh_iflags); | |
1179 | return -EIO; | |
1180 | } | |
1181 | ||
1182 | set_bit(HIF_PROMOTE, &gh->gh_iflags); | |
1183 | ||
1184 | spin_lock(&gl->gl_spin); | |
1185 | add_to_queue(gh); | |
1186 | run_queue(gl); | |
1187 | spin_unlock(&gl->gl_spin); | |
1188 | ||
1189 | if (!(gh->gh_flags & GL_ASYNC)) { | |
1190 | error = glock_wait_internal(gh); | |
1191 | if (error == GLR_CANCELED) { | |
190562bd | 1192 | msleep(100); |
b3b94faa DT |
1193 | goto restart; |
1194 | } | |
1195 | } | |
1196 | ||
1197 | clear_bit(GLF_PREFETCH, &gl->gl_flags); | |
1198 | ||
1199 | return error; | |
1200 | } | |
1201 | ||
1202 | /** | |
1203 | * gfs2_glock_poll - poll to see if an async request has been completed | |
1204 | * @gh: the holder | |
1205 | * | |
1206 | * Returns: 1 if the request is ready to be gfs2_glock_wait()ed on | |
1207 | */ | |
1208 | ||
1209 | int gfs2_glock_poll(struct gfs2_holder *gh) | |
1210 | { | |
1211 | struct gfs2_glock *gl = gh->gh_gl; | |
1212 | int ready = 0; | |
1213 | ||
1214 | spin_lock(&gl->gl_spin); | |
1215 | ||
1216 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
1217 | ready = 1; | |
1218 | else if (list_empty(&gh->gh_list)) { | |
1219 | if (gh->gh_error == GLR_CANCELED) { | |
1220 | spin_unlock(&gl->gl_spin); | |
190562bd | 1221 | msleep(100); |
b3b94faa DT |
1222 | if (gfs2_glock_nq(gh)) |
1223 | return 1; | |
1224 | return 0; | |
1225 | } else | |
1226 | ready = 1; | |
1227 | } | |
1228 | ||
1229 | spin_unlock(&gl->gl_spin); | |
1230 | ||
1231 | return ready; | |
1232 | } | |
1233 | ||
1234 | /** | |
1235 | * gfs2_glock_wait - wait for a lock acquisition that ended in a GLR_ASYNC | |
1236 | * @gh: the holder structure | |
1237 | * | |
1238 | * Returns: 0, GLR_TRYFAILED, or errno on failure | |
1239 | */ | |
1240 | ||
1241 | int gfs2_glock_wait(struct gfs2_holder *gh) | |
1242 | { | |
1243 | int error; | |
1244 | ||
1245 | error = glock_wait_internal(gh); | |
1246 | if (error == GLR_CANCELED) { | |
190562bd | 1247 | msleep(100); |
b3b94faa DT |
1248 | gh->gh_flags &= ~GL_ASYNC; |
1249 | error = gfs2_glock_nq(gh); | |
1250 | } | |
1251 | ||
1252 | return error; | |
1253 | } | |
1254 | ||
1255 | /** | |
1256 | * gfs2_glock_dq - dequeue a struct gfs2_holder from a glock (release a glock) | |
1257 | * @gh: the glock holder | |
1258 | * | |
1259 | */ | |
1260 | ||
1261 | void gfs2_glock_dq(struct gfs2_holder *gh) | |
1262 | { | |
1263 | struct gfs2_glock *gl = gh->gh_gl; | |
b3b94faa DT |
1264 | struct gfs2_glock_operations *glops = gl->gl_ops; |
1265 | ||
b3b94faa DT |
1266 | if (gh->gh_flags & GL_SYNC) |
1267 | set_bit(GLF_SYNC, &gl->gl_flags); | |
1268 | ||
1269 | if (gh->gh_flags & GL_NOCACHE) | |
1270 | handle_callback(gl, LM_ST_UNLOCKED); | |
1271 | ||
1272 | gfs2_glmutex_lock(gl); | |
1273 | ||
1274 | spin_lock(&gl->gl_spin); | |
1275 | list_del_init(&gh->gh_list); | |
1276 | ||
1277 | if (list_empty(&gl->gl_holders)) { | |
1278 | spin_unlock(&gl->gl_spin); | |
1279 | ||
1280 | if (glops->go_unlock) | |
1281 | glops->go_unlock(gh); | |
1282 | ||
1283 | if (test_bit(GLF_SYNC, &gl->gl_flags)) { | |
1284 | if (glops->go_sync) | |
1285 | glops->go_sync(gl, DIO_METADATA | DIO_DATA); | |
1286 | } | |
1287 | ||
1288 | gl->gl_stamp = jiffies; | |
1289 | ||
1290 | spin_lock(&gl->gl_spin); | |
1291 | } | |
1292 | ||
1293 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
1294 | run_queue(gl); | |
1295 | spin_unlock(&gl->gl_spin); | |
1296 | } | |
1297 | ||
1298 | /** | |
1299 | * gfs2_glock_prefetch - Try to prefetch a glock | |
1300 | * @gl: the glock | |
1301 | * @state: the state to prefetch in | |
1302 | * @flags: flags passed to go_xmote_th() | |
1303 | * | |
1304 | */ | |
1305 | ||
08bc2dbc AB |
1306 | static void gfs2_glock_prefetch(struct gfs2_glock *gl, unsigned int state, |
1307 | int flags) | |
b3b94faa DT |
1308 | { |
1309 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
1310 | ||
1311 | spin_lock(&gl->gl_spin); | |
1312 | ||
1313 | if (test_bit(GLF_LOCK, &gl->gl_flags) || | |
1314 | !list_empty(&gl->gl_holders) || | |
1315 | !list_empty(&gl->gl_waiters1) || | |
1316 | !list_empty(&gl->gl_waiters2) || | |
1317 | !list_empty(&gl->gl_waiters3) || | |
1318 | relaxed_state_ok(gl->gl_state, state, flags)) { | |
1319 | spin_unlock(&gl->gl_spin); | |
1320 | return; | |
1321 | } | |
1322 | ||
1323 | set_bit(GLF_PREFETCH, &gl->gl_flags); | |
1324 | set_bit(GLF_LOCK, &gl->gl_flags); | |
1325 | spin_unlock(&gl->gl_spin); | |
1326 | ||
1327 | glops->go_xmote_th(gl, state, flags); | |
b3b94faa DT |
1328 | } |
1329 | ||
b3b94faa DT |
1330 | static void greedy_work(void *data) |
1331 | { | |
e7f5c01c | 1332 | struct greedy *gr = data; |
b3b94faa DT |
1333 | struct gfs2_holder *gh = &gr->gr_gh; |
1334 | struct gfs2_glock *gl = gh->gh_gl; | |
1335 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
1336 | ||
1337 | clear_bit(GLF_SKIP_WAITERS2, &gl->gl_flags); | |
1338 | ||
1339 | if (glops->go_greedy) | |
1340 | glops->go_greedy(gl); | |
1341 | ||
1342 | spin_lock(&gl->gl_spin); | |
1343 | ||
1344 | if (list_empty(&gl->gl_waiters2)) { | |
1345 | clear_bit(GLF_GREEDY, &gl->gl_flags); | |
1346 | spin_unlock(&gl->gl_spin); | |
1347 | gfs2_holder_uninit(gh); | |
1348 | kfree(gr); | |
1349 | } else { | |
1350 | gfs2_glock_hold(gl); | |
1351 | list_add_tail(&gh->gh_list, &gl->gl_waiters2); | |
1352 | run_queue(gl); | |
1353 | spin_unlock(&gl->gl_spin); | |
1354 | gfs2_glock_put(gl); | |
1355 | } | |
1356 | } | |
1357 | ||
1358 | /** | |
1359 | * gfs2_glock_be_greedy - | |
1360 | * @gl: | |
1361 | * @time: | |
1362 | * | |
1363 | * Returns: 0 if go_greedy will be called, 1 otherwise | |
1364 | */ | |
1365 | ||
1366 | int gfs2_glock_be_greedy(struct gfs2_glock *gl, unsigned int time) | |
1367 | { | |
1368 | struct greedy *gr; | |
1369 | struct gfs2_holder *gh; | |
1370 | ||
1371 | if (!time || | |
1372 | gl->gl_sbd->sd_args.ar_localcaching || | |
1373 | test_and_set_bit(GLF_GREEDY, &gl->gl_flags)) | |
1374 | return 1; | |
1375 | ||
1376 | gr = kmalloc(sizeof(struct greedy), GFP_KERNEL); | |
1377 | if (!gr) { | |
1378 | clear_bit(GLF_GREEDY, &gl->gl_flags); | |
1379 | return 1; | |
1380 | } | |
1381 | gh = &gr->gr_gh; | |
1382 | ||
579b78a4 | 1383 | gfs2_holder_init(gl, 0, 0, gh); |
b3b94faa DT |
1384 | set_bit(HIF_GREEDY, &gh->gh_iflags); |
1385 | INIT_WORK(&gr->gr_work, greedy_work, gr); | |
1386 | ||
1387 | set_bit(GLF_SKIP_WAITERS2, &gl->gl_flags); | |
1388 | schedule_delayed_work(&gr->gr_work, time); | |
1389 | ||
1390 | return 0; | |
1391 | } | |
1392 | ||
b3b94faa DT |
1393 | /** |
1394 | * gfs2_glock_dq_uninit - dequeue a holder from a glock and initialize it | |
1395 | * @gh: the holder structure | |
1396 | * | |
1397 | */ | |
1398 | ||
1399 | void gfs2_glock_dq_uninit(struct gfs2_holder *gh) | |
1400 | { | |
1401 | gfs2_glock_dq(gh); | |
1402 | gfs2_holder_uninit(gh); | |
1403 | } | |
1404 | ||
1405 | /** | |
1406 | * gfs2_glock_nq_num - acquire a glock based on lock number | |
1407 | * @sdp: the filesystem | |
1408 | * @number: the lock number | |
1409 | * @glops: the glock operations for the type of glock | |
1410 | * @state: the state to acquire the glock in | |
1411 | * @flags: modifier flags for the aquisition | |
1412 | * @gh: the struct gfs2_holder | |
1413 | * | |
1414 | * Returns: errno | |
1415 | */ | |
1416 | ||
1417 | int gfs2_glock_nq_num(struct gfs2_sbd *sdp, uint64_t number, | |
1418 | struct gfs2_glock_operations *glops, unsigned int state, | |
1419 | int flags, struct gfs2_holder *gh) | |
1420 | { | |
1421 | struct gfs2_glock *gl; | |
1422 | int error; | |
1423 | ||
1424 | error = gfs2_glock_get(sdp, number, glops, CREATE, &gl); | |
1425 | if (!error) { | |
1426 | error = gfs2_glock_nq_init(gl, state, flags, gh); | |
1427 | gfs2_glock_put(gl); | |
1428 | } | |
1429 | ||
1430 | return error; | |
1431 | } | |
1432 | ||
1433 | /** | |
1434 | * glock_compare - Compare two struct gfs2_glock structures for sorting | |
1435 | * @arg_a: the first structure | |
1436 | * @arg_b: the second structure | |
1437 | * | |
1438 | */ | |
1439 | ||
1440 | static int glock_compare(const void *arg_a, const void *arg_b) | |
1441 | { | |
1442 | struct gfs2_holder *gh_a = *(struct gfs2_holder **)arg_a; | |
1443 | struct gfs2_holder *gh_b = *(struct gfs2_holder **)arg_b; | |
1444 | struct lm_lockname *a = &gh_a->gh_gl->gl_name; | |
1445 | struct lm_lockname *b = &gh_b->gh_gl->gl_name; | |
1446 | int ret = 0; | |
1447 | ||
1448 | if (a->ln_number > b->ln_number) | |
1449 | ret = 1; | |
1450 | else if (a->ln_number < b->ln_number) | |
1451 | ret = -1; | |
1452 | else { | |
1453 | if (gh_a->gh_state == LM_ST_SHARED && | |
1454 | gh_b->gh_state == LM_ST_EXCLUSIVE) | |
1455 | ret = 1; | |
1456 | else if (!(gh_a->gh_flags & GL_LOCAL_EXCL) && | |
1457 | (gh_b->gh_flags & GL_LOCAL_EXCL)) | |
1458 | ret = 1; | |
1459 | } | |
1460 | ||
1461 | return ret; | |
1462 | } | |
1463 | ||
1464 | /** | |
1465 | * nq_m_sync - synchonously acquire more than one glock in deadlock free order | |
1466 | * @num_gh: the number of structures | |
1467 | * @ghs: an array of struct gfs2_holder structures | |
1468 | * | |
1469 | * Returns: 0 on success (all glocks acquired), | |
1470 | * errno on failure (no glocks acquired) | |
1471 | */ | |
1472 | ||
1473 | static int nq_m_sync(unsigned int num_gh, struct gfs2_holder *ghs, | |
1474 | struct gfs2_holder **p) | |
1475 | { | |
1476 | unsigned int x; | |
1477 | int error = 0; | |
1478 | ||
1479 | for (x = 0; x < num_gh; x++) | |
1480 | p[x] = &ghs[x]; | |
1481 | ||
1482 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare, NULL); | |
1483 | ||
1484 | for (x = 0; x < num_gh; x++) { | |
1485 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1486 | ||
1487 | error = gfs2_glock_nq(p[x]); | |
1488 | if (error) { | |
1489 | while (x--) | |
1490 | gfs2_glock_dq(p[x]); | |
1491 | break; | |
1492 | } | |
1493 | } | |
1494 | ||
1495 | return error; | |
1496 | } | |
1497 | ||
1498 | /** | |
1499 | * gfs2_glock_nq_m - acquire multiple glocks | |
1500 | * @num_gh: the number of structures | |
1501 | * @ghs: an array of struct gfs2_holder structures | |
1502 | * | |
1503 | * Figure out how big an impact this function has. Either: | |
1504 | * 1) Replace this code with code that calls gfs2_glock_prefetch() | |
1505 | * 2) Forget async stuff and just call nq_m_sync() | |
1506 | * 3) Leave it like it is | |
1507 | * | |
1508 | * Returns: 0 on success (all glocks acquired), | |
1509 | * errno on failure (no glocks acquired) | |
1510 | */ | |
1511 | ||
1512 | int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1513 | { | |
1514 | int *e; | |
1515 | unsigned int x; | |
1516 | int borked = 0, serious = 0; | |
1517 | int error = 0; | |
1518 | ||
1519 | if (!num_gh) | |
1520 | return 0; | |
1521 | ||
1522 | if (num_gh == 1) { | |
1523 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1524 | return gfs2_glock_nq(ghs); | |
1525 | } | |
1526 | ||
1527 | e = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL); | |
1528 | if (!e) | |
1529 | return -ENOMEM; | |
1530 | ||
1531 | for (x = 0; x < num_gh; x++) { | |
1532 | ghs[x].gh_flags |= LM_FLAG_TRY | GL_ASYNC; | |
1533 | error = gfs2_glock_nq(&ghs[x]); | |
1534 | if (error) { | |
1535 | borked = 1; | |
1536 | serious = error; | |
1537 | num_gh = x; | |
1538 | break; | |
1539 | } | |
1540 | } | |
1541 | ||
1542 | for (x = 0; x < num_gh; x++) { | |
1543 | error = e[x] = glock_wait_internal(&ghs[x]); | |
1544 | if (error) { | |
1545 | borked = 1; | |
1546 | if (error != GLR_TRYFAILED && error != GLR_CANCELED) | |
1547 | serious = error; | |
1548 | } | |
1549 | } | |
1550 | ||
1551 | if (!borked) { | |
1552 | kfree(e); | |
1553 | return 0; | |
1554 | } | |
1555 | ||
1556 | for (x = 0; x < num_gh; x++) | |
1557 | if (!e[x]) | |
1558 | gfs2_glock_dq(&ghs[x]); | |
1559 | ||
1560 | if (serious) | |
1561 | error = serious; | |
1562 | else { | |
1563 | for (x = 0; x < num_gh; x++) | |
1564 | gfs2_holder_reinit(ghs[x].gh_state, ghs[x].gh_flags, | |
1565 | &ghs[x]); | |
1566 | error = nq_m_sync(num_gh, ghs, (struct gfs2_holder **)e); | |
1567 | } | |
1568 | ||
1569 | kfree(e); | |
1570 | ||
1571 | return error; | |
1572 | } | |
1573 | ||
1574 | /** | |
1575 | * gfs2_glock_dq_m - release multiple glocks | |
1576 | * @num_gh: the number of structures | |
1577 | * @ghs: an array of struct gfs2_holder structures | |
1578 | * | |
1579 | */ | |
1580 | ||
1581 | void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1582 | { | |
1583 | unsigned int x; | |
1584 | ||
1585 | for (x = 0; x < num_gh; x++) | |
1586 | gfs2_glock_dq(&ghs[x]); | |
1587 | } | |
1588 | ||
1589 | /** | |
1590 | * gfs2_glock_dq_uninit_m - release multiple glocks | |
1591 | * @num_gh: the number of structures | |
1592 | * @ghs: an array of struct gfs2_holder structures | |
1593 | * | |
1594 | */ | |
1595 | ||
1596 | void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1597 | { | |
1598 | unsigned int x; | |
1599 | ||
1600 | for (x = 0; x < num_gh; x++) | |
1601 | gfs2_glock_dq_uninit(&ghs[x]); | |
1602 | } | |
1603 | ||
1604 | /** | |
1605 | * gfs2_glock_prefetch_num - prefetch a glock based on lock number | |
1606 | * @sdp: the filesystem | |
1607 | * @number: the lock number | |
1608 | * @glops: the glock operations for the type of glock | |
1609 | * @state: the state to acquire the glock in | |
1610 | * @flags: modifier flags for the aquisition | |
1611 | * | |
1612 | * Returns: errno | |
1613 | */ | |
1614 | ||
1615 | void gfs2_glock_prefetch_num(struct gfs2_sbd *sdp, uint64_t number, | |
1616 | struct gfs2_glock_operations *glops, | |
1617 | unsigned int state, int flags) | |
1618 | { | |
1619 | struct gfs2_glock *gl; | |
1620 | int error; | |
1621 | ||
1622 | if (atomic_read(&sdp->sd_reclaim_count) < | |
1623 | gfs2_tune_get(sdp, gt_reclaim_limit)) { | |
1624 | error = gfs2_glock_get(sdp, number, glops, CREATE, &gl); | |
1625 | if (!error) { | |
1626 | gfs2_glock_prefetch(gl, state, flags); | |
1627 | gfs2_glock_put(gl); | |
1628 | } | |
1629 | } | |
1630 | } | |
1631 | ||
1632 | /** | |
1633 | * gfs2_lvb_hold - attach a LVB from a glock | |
1634 | * @gl: The glock in question | |
1635 | * | |
1636 | */ | |
1637 | ||
1638 | int gfs2_lvb_hold(struct gfs2_glock *gl) | |
1639 | { | |
1640 | int error; | |
1641 | ||
1642 | gfs2_glmutex_lock(gl); | |
1643 | ||
1644 | if (!atomic_read(&gl->gl_lvb_count)) { | |
1645 | error = gfs2_lm_hold_lvb(gl->gl_sbd, gl->gl_lock, &gl->gl_lvb); | |
1646 | if (error) { | |
1647 | gfs2_glmutex_unlock(gl); | |
1648 | return error; | |
1649 | } | |
1650 | gfs2_glock_hold(gl); | |
1651 | } | |
1652 | atomic_inc(&gl->gl_lvb_count); | |
1653 | ||
1654 | gfs2_glmutex_unlock(gl); | |
1655 | ||
1656 | return 0; | |
1657 | } | |
1658 | ||
1659 | /** | |
1660 | * gfs2_lvb_unhold - detach a LVB from a glock | |
1661 | * @gl: The glock in question | |
1662 | * | |
1663 | */ | |
1664 | ||
1665 | void gfs2_lvb_unhold(struct gfs2_glock *gl) | |
1666 | { | |
1667 | gfs2_glock_hold(gl); | |
1668 | gfs2_glmutex_lock(gl); | |
1669 | ||
1670 | gfs2_assert(gl->gl_sbd, atomic_read(&gl->gl_lvb_count) > 0); | |
1671 | if (atomic_dec_and_test(&gl->gl_lvb_count)) { | |
1672 | gfs2_lm_unhold_lvb(gl->gl_sbd, gl->gl_lock, gl->gl_lvb); | |
1673 | gl->gl_lvb = NULL; | |
1674 | gfs2_glock_put(gl); | |
1675 | } | |
1676 | ||
1677 | gfs2_glmutex_unlock(gl); | |
1678 | gfs2_glock_put(gl); | |
1679 | } | |
1680 | ||
08bc2dbc | 1681 | #if 0 |
b3b94faa DT |
1682 | void gfs2_lvb_sync(struct gfs2_glock *gl) |
1683 | { | |
1684 | gfs2_glmutex_lock(gl); | |
1685 | ||
1686 | gfs2_assert(gl->gl_sbd, atomic_read(&gl->gl_lvb_count)); | |
1687 | if (!gfs2_assert_warn(gl->gl_sbd, gfs2_glock_is_held_excl(gl))) | |
1688 | gfs2_lm_sync_lvb(gl->gl_sbd, gl->gl_lock, gl->gl_lvb); | |
1689 | ||
1690 | gfs2_glmutex_unlock(gl); | |
1691 | } | |
08bc2dbc | 1692 | #endif /* 0 */ |
b3b94faa DT |
1693 | |
1694 | static void blocking_cb(struct gfs2_sbd *sdp, struct lm_lockname *name, | |
1695 | unsigned int state) | |
1696 | { | |
1697 | struct gfs2_glock *gl; | |
1698 | ||
1699 | gl = gfs2_glock_find(sdp, name); | |
1700 | if (!gl) | |
1701 | return; | |
1702 | ||
1703 | if (gl->gl_ops->go_callback) | |
1704 | gl->gl_ops->go_callback(gl, state); | |
1705 | handle_callback(gl, state); | |
1706 | ||
1707 | spin_lock(&gl->gl_spin); | |
1708 | run_queue(gl); | |
1709 | spin_unlock(&gl->gl_spin); | |
1710 | ||
1711 | gfs2_glock_put(gl); | |
1712 | } | |
1713 | ||
1714 | /** | |
1715 | * gfs2_glock_cb - Callback used by locking module | |
1716 | * @fsdata: Pointer to the superblock | |
1717 | * @type: Type of callback | |
1718 | * @data: Type dependent data pointer | |
1719 | * | |
1720 | * Called by the locking module when it wants to tell us something. | |
1721 | * Either we need to drop a lock, one of our ASYNC requests completed, or | |
1722 | * a journal from another client needs to be recovered. | |
1723 | */ | |
1724 | ||
1725 | void gfs2_glock_cb(lm_fsdata_t *fsdata, unsigned int type, void *data) | |
1726 | { | |
1727 | struct gfs2_sbd *sdp = (struct gfs2_sbd *)fsdata; | |
1728 | ||
b3b94faa DT |
1729 | switch (type) { |
1730 | case LM_CB_NEED_E: | |
e7f5c01c | 1731 | blocking_cb(sdp, data, LM_ST_UNLOCKED); |
b3b94faa DT |
1732 | return; |
1733 | ||
1734 | case LM_CB_NEED_D: | |
e7f5c01c | 1735 | blocking_cb(sdp, data, LM_ST_DEFERRED); |
b3b94faa DT |
1736 | return; |
1737 | ||
1738 | case LM_CB_NEED_S: | |
e7f5c01c | 1739 | blocking_cb(sdp, data, LM_ST_SHARED); |
b3b94faa DT |
1740 | return; |
1741 | ||
1742 | case LM_CB_ASYNC: { | |
e7f5c01c | 1743 | struct lm_async_cb *async = data; |
b3b94faa DT |
1744 | struct gfs2_glock *gl; |
1745 | ||
1746 | gl = gfs2_glock_find(sdp, &async->lc_name); | |
1747 | if (gfs2_assert_warn(sdp, gl)) | |
1748 | return; | |
1749 | if (!gfs2_assert_warn(sdp, gl->gl_req_bh)) | |
1750 | gl->gl_req_bh(gl, async->lc_ret); | |
1751 | gfs2_glock_put(gl); | |
b3b94faa DT |
1752 | return; |
1753 | } | |
1754 | ||
1755 | case LM_CB_NEED_RECOVERY: | |
1756 | gfs2_jdesc_make_dirty(sdp, *(unsigned int *)data); | |
1757 | if (sdp->sd_recoverd_process) | |
1758 | wake_up_process(sdp->sd_recoverd_process); | |
1759 | return; | |
1760 | ||
1761 | case LM_CB_DROPLOCKS: | |
1762 | gfs2_gl_hash_clear(sdp, NO_WAIT); | |
1763 | gfs2_quota_scan(sdp); | |
1764 | return; | |
1765 | ||
1766 | default: | |
1767 | gfs2_assert_warn(sdp, 0); | |
1768 | return; | |
1769 | } | |
1770 | } | |
1771 | ||
1772 | /** | |
1773 | * gfs2_try_toss_inode - try to remove a particular inode struct from cache | |
1774 | * sdp: the filesystem | |
1775 | * inum: the inode number | |
1776 | * | |
1777 | */ | |
1778 | ||
1779 | void gfs2_try_toss_inode(struct gfs2_sbd *sdp, struct gfs2_inum *inum) | |
1780 | { | |
1781 | struct gfs2_glock *gl; | |
1782 | struct gfs2_inode *ip; | |
1783 | int error; | |
1784 | ||
1785 | error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, | |
1786 | NO_CREATE, &gl); | |
1787 | if (error || !gl) | |
1788 | return; | |
1789 | ||
1790 | if (!gfs2_glmutex_trylock(gl)) | |
1791 | goto out; | |
1792 | ||
5c676f6d | 1793 | ip = gl->gl_object; |
b3b94faa DT |
1794 | if (!ip) |
1795 | goto out_unlock; | |
1796 | ||
1797 | if (atomic_read(&ip->i_count)) | |
1798 | goto out_unlock; | |
1799 | ||
36327521 | 1800 | gfs2_inode_destroy(ip, 1); |
b3b94faa DT |
1801 | |
1802 | out_unlock: | |
1803 | gfs2_glmutex_unlock(gl); | |
1804 | ||
1805 | out: | |
1806 | gfs2_glock_put(gl); | |
1807 | } | |
1808 | ||
1809 | /** | |
1810 | * gfs2_iopen_go_callback - Try to kick the inode/vnode associated with an | |
1811 | * iopen glock from memory | |
1812 | * @io_gl: the iopen glock | |
1813 | * @state: the state into which the glock should be put | |
1814 | * | |
1815 | */ | |
1816 | ||
1817 | void gfs2_iopen_go_callback(struct gfs2_glock *io_gl, unsigned int state) | |
1818 | { | |
1819 | struct gfs2_glock *i_gl; | |
1820 | ||
1821 | if (state != LM_ST_UNLOCKED) | |
1822 | return; | |
1823 | ||
1824 | spin_lock(&io_gl->gl_spin); | |
5c676f6d | 1825 | i_gl = io_gl->gl_object; |
b3b94faa DT |
1826 | if (i_gl) { |
1827 | gfs2_glock_hold(i_gl); | |
1828 | spin_unlock(&io_gl->gl_spin); | |
1829 | } else { | |
1830 | spin_unlock(&io_gl->gl_spin); | |
1831 | return; | |
1832 | } | |
1833 | ||
1834 | if (gfs2_glmutex_trylock(i_gl)) { | |
5c676f6d | 1835 | struct gfs2_inode *ip = i_gl->gl_object; |
b3b94faa DT |
1836 | if (ip) { |
1837 | gfs2_try_toss_vnode(ip); | |
1838 | gfs2_glmutex_unlock(i_gl); | |
1839 | gfs2_glock_schedule_for_reclaim(i_gl); | |
1840 | goto out; | |
1841 | } | |
1842 | gfs2_glmutex_unlock(i_gl); | |
1843 | } | |
1844 | ||
1845 | out: | |
1846 | gfs2_glock_put(i_gl); | |
1847 | } | |
1848 | ||
1849 | /** | |
1850 | * demote_ok - Check to see if it's ok to unlock a glock | |
1851 | * @gl: the glock | |
1852 | * | |
1853 | * Returns: 1 if it's ok | |
1854 | */ | |
1855 | ||
1856 | static int demote_ok(struct gfs2_glock *gl) | |
1857 | { | |
1858 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1859 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
1860 | int demote = 1; | |
1861 | ||
1862 | if (test_bit(GLF_STICKY, &gl->gl_flags)) | |
1863 | demote = 0; | |
1864 | else if (test_bit(GLF_PREFETCH, &gl->gl_flags)) | |
1865 | demote = time_after_eq(jiffies, | |
1866 | gl->gl_stamp + | |
1867 | gfs2_tune_get(sdp, gt_prefetch_secs) * HZ); | |
1868 | else if (glops->go_demote_ok) | |
1869 | demote = glops->go_demote_ok(gl); | |
1870 | ||
1871 | return demote; | |
1872 | } | |
1873 | ||
1874 | /** | |
1875 | * gfs2_glock_schedule_for_reclaim - Add a glock to the reclaim list | |
1876 | * @gl: the glock | |
1877 | * | |
1878 | */ | |
1879 | ||
1880 | void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl) | |
1881 | { | |
1882 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1883 | ||
1884 | spin_lock(&sdp->sd_reclaim_lock); | |
1885 | if (list_empty(&gl->gl_reclaim)) { | |
1886 | gfs2_glock_hold(gl); | |
1887 | list_add(&gl->gl_reclaim, &sdp->sd_reclaim_list); | |
1888 | atomic_inc(&sdp->sd_reclaim_count); | |
1889 | } | |
1890 | spin_unlock(&sdp->sd_reclaim_lock); | |
1891 | ||
1892 | wake_up(&sdp->sd_reclaim_wq); | |
1893 | } | |
1894 | ||
1895 | /** | |
1896 | * gfs2_reclaim_glock - process the next glock on the filesystem's reclaim list | |
1897 | * @sdp: the filesystem | |
1898 | * | |
1899 | * Called from gfs2_glockd() glock reclaim daemon, or when promoting a | |
1900 | * different glock and we notice that there are a lot of glocks in the | |
1901 | * reclaim list. | |
1902 | * | |
1903 | */ | |
1904 | ||
1905 | void gfs2_reclaim_glock(struct gfs2_sbd *sdp) | |
1906 | { | |
1907 | struct gfs2_glock *gl; | |
1908 | ||
1909 | spin_lock(&sdp->sd_reclaim_lock); | |
1910 | if (list_empty(&sdp->sd_reclaim_list)) { | |
1911 | spin_unlock(&sdp->sd_reclaim_lock); | |
1912 | return; | |
1913 | } | |
1914 | gl = list_entry(sdp->sd_reclaim_list.next, | |
1915 | struct gfs2_glock, gl_reclaim); | |
1916 | list_del_init(&gl->gl_reclaim); | |
1917 | spin_unlock(&sdp->sd_reclaim_lock); | |
1918 | ||
1919 | atomic_dec(&sdp->sd_reclaim_count); | |
1920 | atomic_inc(&sdp->sd_reclaimed); | |
1921 | ||
1922 | if (gfs2_glmutex_trylock(gl)) { | |
1923 | if (gl->gl_ops == &gfs2_inode_glops) { | |
5c676f6d | 1924 | struct gfs2_inode *ip = gl->gl_object; |
b3b94faa | 1925 | if (ip && !atomic_read(&ip->i_count)) |
36327521 | 1926 | gfs2_inode_destroy(ip, 1); |
b3b94faa DT |
1927 | } |
1928 | if (queue_empty(gl, &gl->gl_holders) && | |
1929 | gl->gl_state != LM_ST_UNLOCKED && | |
1930 | demote_ok(gl)) | |
1931 | handle_callback(gl, LM_ST_UNLOCKED); | |
1932 | gfs2_glmutex_unlock(gl); | |
1933 | } | |
1934 | ||
1935 | gfs2_glock_put(gl); | |
1936 | } | |
1937 | ||
1938 | /** | |
1939 | * examine_bucket - Call a function for glock in a hash bucket | |
1940 | * @examiner: the function | |
1941 | * @sdp: the filesystem | |
1942 | * @bucket: the bucket | |
1943 | * | |
1944 | * Returns: 1 if the bucket has entries | |
1945 | */ | |
1946 | ||
1947 | static int examine_bucket(glock_examiner examiner, struct gfs2_sbd *sdp, | |
1948 | struct gfs2_gl_hash_bucket *bucket) | |
1949 | { | |
1950 | struct glock_plug plug; | |
1951 | struct list_head *tmp; | |
1952 | struct gfs2_glock *gl; | |
1953 | int entries; | |
1954 | ||
1955 | /* Add "plug" to end of bucket list, work back up list from there */ | |
1956 | memset(&plug.gl_flags, 0, sizeof(unsigned long)); | |
1957 | set_bit(GLF_PLUG, &plug.gl_flags); | |
1958 | ||
1959 | write_lock(&bucket->hb_lock); | |
1960 | list_add(&plug.gl_list, &bucket->hb_list); | |
1961 | write_unlock(&bucket->hb_lock); | |
1962 | ||
1963 | for (;;) { | |
1964 | write_lock(&bucket->hb_lock); | |
1965 | ||
1966 | for (;;) { | |
1967 | tmp = plug.gl_list.next; | |
1968 | ||
1969 | if (tmp == &bucket->hb_list) { | |
1970 | list_del(&plug.gl_list); | |
1971 | entries = !list_empty(&bucket->hb_list); | |
1972 | write_unlock(&bucket->hb_lock); | |
1973 | return entries; | |
1974 | } | |
1975 | gl = list_entry(tmp, struct gfs2_glock, gl_list); | |
1976 | ||
1977 | /* Move plug up list */ | |
1978 | list_move(&plug.gl_list, &gl->gl_list); | |
1979 | ||
1980 | if (test_bit(GLF_PLUG, &gl->gl_flags)) | |
1981 | continue; | |
1982 | ||
1983 | /* examiner() must glock_put() */ | |
1984 | gfs2_glock_hold(gl); | |
1985 | ||
1986 | break; | |
1987 | } | |
1988 | ||
1989 | write_unlock(&bucket->hb_lock); | |
1990 | ||
1991 | examiner(gl); | |
1992 | } | |
1993 | } | |
1994 | ||
1995 | /** | |
1996 | * scan_glock - look at a glock and see if we can reclaim it | |
1997 | * @gl: the glock to look at | |
1998 | * | |
1999 | */ | |
2000 | ||
2001 | static void scan_glock(struct gfs2_glock *gl) | |
2002 | { | |
2003 | if (gfs2_glmutex_trylock(gl)) { | |
2004 | if (gl->gl_ops == &gfs2_inode_glops) { | |
5c676f6d | 2005 | struct gfs2_inode *ip = gl->gl_object; |
b3b94faa DT |
2006 | if (ip && !atomic_read(&ip->i_count)) |
2007 | goto out_schedule; | |
2008 | } | |
2009 | if (queue_empty(gl, &gl->gl_holders) && | |
2010 | gl->gl_state != LM_ST_UNLOCKED && | |
2011 | demote_ok(gl)) | |
2012 | goto out_schedule; | |
2013 | ||
2014 | gfs2_glmutex_unlock(gl); | |
2015 | } | |
2016 | ||
2017 | gfs2_glock_put(gl); | |
2018 | ||
2019 | return; | |
2020 | ||
2021 | out_schedule: | |
2022 | gfs2_glmutex_unlock(gl); | |
2023 | gfs2_glock_schedule_for_reclaim(gl); | |
2024 | gfs2_glock_put(gl); | |
2025 | } | |
2026 | ||
2027 | /** | |
2028 | * gfs2_scand_internal - Look for glocks and inodes to toss from memory | |
2029 | * @sdp: the filesystem | |
2030 | * | |
2031 | */ | |
2032 | ||
2033 | void gfs2_scand_internal(struct gfs2_sbd *sdp) | |
2034 | { | |
2035 | unsigned int x; | |
2036 | ||
2037 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) { | |
2038 | examine_bucket(scan_glock, sdp, &sdp->sd_gl_hash[x]); | |
2039 | cond_resched(); | |
2040 | } | |
2041 | } | |
2042 | ||
2043 | /** | |
2044 | * clear_glock - look at a glock and see if we can free it from glock cache | |
2045 | * @gl: the glock to look at | |
2046 | * | |
2047 | */ | |
2048 | ||
2049 | static void clear_glock(struct gfs2_glock *gl) | |
2050 | { | |
2051 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
2052 | int released; | |
2053 | ||
2054 | spin_lock(&sdp->sd_reclaim_lock); | |
2055 | if (!list_empty(&gl->gl_reclaim)) { | |
2056 | list_del_init(&gl->gl_reclaim); | |
2057 | atomic_dec(&sdp->sd_reclaim_count); | |
190562bd | 2058 | spin_unlock(&sdp->sd_reclaim_lock); |
b3b94faa DT |
2059 | released = gfs2_glock_put(gl); |
2060 | gfs2_assert(sdp, !released); | |
190562bd SW |
2061 | } else { |
2062 | spin_unlock(&sdp->sd_reclaim_lock); | |
b3b94faa | 2063 | } |
b3b94faa DT |
2064 | |
2065 | if (gfs2_glmutex_trylock(gl)) { | |
2066 | if (gl->gl_ops == &gfs2_inode_glops) { | |
5c676f6d | 2067 | struct gfs2_inode *ip = gl->gl_object; |
b3b94faa | 2068 | if (ip && !atomic_read(&ip->i_count)) |
36327521 | 2069 | gfs2_inode_destroy(ip, 1); |
b3b94faa DT |
2070 | } |
2071 | if (queue_empty(gl, &gl->gl_holders) && | |
2072 | gl->gl_state != LM_ST_UNLOCKED) | |
2073 | handle_callback(gl, LM_ST_UNLOCKED); | |
2074 | ||
2075 | gfs2_glmutex_unlock(gl); | |
2076 | } | |
2077 | ||
2078 | gfs2_glock_put(gl); | |
2079 | } | |
2080 | ||
2081 | /** | |
2082 | * gfs2_gl_hash_clear - Empty out the glock hash table | |
2083 | * @sdp: the filesystem | |
2084 | * @wait: wait until it's all gone | |
2085 | * | |
2086 | * Called when unmounting the filesystem, or when inter-node lock manager | |
2087 | * requests DROPLOCKS because it is running out of capacity. | |
2088 | */ | |
2089 | ||
2090 | void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait) | |
2091 | { | |
2092 | unsigned long t; | |
2093 | unsigned int x; | |
2094 | int cont; | |
2095 | ||
2096 | t = jiffies; | |
2097 | ||
2098 | for (;;) { | |
2099 | cont = 0; | |
2100 | ||
2101 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) | |
2102 | if (examine_bucket(clear_glock, sdp, | |
2103 | &sdp->sd_gl_hash[x])) | |
2104 | cont = 1; | |
2105 | ||
2106 | if (!wait || !cont) | |
2107 | break; | |
2108 | ||
2109 | if (time_after_eq(jiffies, | |
2110 | t + gfs2_tune_get(sdp, gt_stall_secs) * HZ)) { | |
2111 | fs_warn(sdp, "Unmount seems to be stalled. " | |
2112 | "Dumping lock state...\n"); | |
2113 | gfs2_dump_lockstate(sdp); | |
2114 | t = jiffies; | |
2115 | } | |
2116 | ||
2117 | /* invalidate_inodes() requires that the sb inodes list | |
2118 | not change, but an async completion callback for an | |
2119 | unlock can occur which does glock_put() which | |
2120 | can call iput() which will change the sb inodes list. | |
2121 | invalidate_inodes_mutex prevents glock_put()'s during | |
2122 | an invalidate_inodes() */ | |
2123 | ||
f55ab26a | 2124 | mutex_lock(&sdp->sd_invalidate_inodes_mutex); |
b3b94faa | 2125 | invalidate_inodes(sdp->sd_vfs); |
f55ab26a | 2126 | mutex_unlock(&sdp->sd_invalidate_inodes_mutex); |
fd88de56 | 2127 | msleep(10); |
b3b94faa DT |
2128 | } |
2129 | } | |
2130 | ||
2131 | /* | |
2132 | * Diagnostic routines to help debug distributed deadlock | |
2133 | */ | |
2134 | ||
2135 | /** | |
2136 | * dump_holder - print information about a glock holder | |
2137 | * @str: a string naming the type of holder | |
2138 | * @gh: the glock holder | |
2139 | * | |
2140 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
2141 | */ | |
2142 | ||
2143 | static int dump_holder(char *str, struct gfs2_holder *gh) | |
2144 | { | |
2145 | unsigned int x; | |
2146 | int error = -ENOBUFS; | |
2147 | ||
d92a8d48 SW |
2148 | printk(KERN_INFO " %s\n", str); |
2149 | printk(KERN_INFO " owner = %ld\n", | |
b3b94faa | 2150 | (gh->gh_owner) ? (long)gh->gh_owner->pid : -1); |
d92a8d48 SW |
2151 | printk(KERN_INFO " gh_state = %u\n", gh->gh_state); |
2152 | printk(KERN_INFO " gh_flags ="); | |
b3b94faa DT |
2153 | for (x = 0; x < 32; x++) |
2154 | if (gh->gh_flags & (1 << x)) | |
2155 | printk(" %u", x); | |
2156 | printk(" \n"); | |
d92a8d48 SW |
2157 | printk(KERN_INFO " error = %d\n", gh->gh_error); |
2158 | printk(KERN_INFO " gh_iflags ="); | |
b3b94faa DT |
2159 | for (x = 0; x < 32; x++) |
2160 | if (test_bit(x, &gh->gh_iflags)) | |
2161 | printk(" %u", x); | |
2162 | printk(" \n"); | |
d0dc80db | 2163 | print_symbol(KERN_INFO " initialized at: %s\n", gh->gh_ip); |
b3b94faa DT |
2164 | |
2165 | error = 0; | |
2166 | ||
2167 | return error; | |
2168 | } | |
2169 | ||
2170 | /** | |
2171 | * dump_inode - print information about an inode | |
2172 | * @ip: the inode | |
2173 | * | |
2174 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
2175 | */ | |
2176 | ||
2177 | static int dump_inode(struct gfs2_inode *ip) | |
2178 | { | |
2179 | unsigned int x; | |
2180 | int error = -ENOBUFS; | |
2181 | ||
d92a8d48 SW |
2182 | printk(KERN_INFO " Inode:\n"); |
2183 | printk(KERN_INFO " num = %llu %llu\n", | |
b3b94faa | 2184 | ip->i_num.no_formal_ino, ip->i_num.no_addr); |
d92a8d48 SW |
2185 | printk(KERN_INFO " type = %u\n", IF2DT(ip->i_di.di_mode)); |
2186 | printk(KERN_INFO " i_count = %d\n", atomic_read(&ip->i_count)); | |
2187 | printk(KERN_INFO " i_flags ="); | |
b3b94faa DT |
2188 | for (x = 0; x < 32; x++) |
2189 | if (test_bit(x, &ip->i_flags)) | |
2190 | printk(" %u", x); | |
2191 | printk(" \n"); | |
d92a8d48 | 2192 | printk(KERN_INFO " vnode = %s\n", (ip->i_vnode) ? "yes" : "no"); |
b3b94faa DT |
2193 | |
2194 | error = 0; | |
2195 | ||
2196 | return error; | |
2197 | } | |
2198 | ||
2199 | /** | |
2200 | * dump_glock - print information about a glock | |
2201 | * @gl: the glock | |
2202 | * @count: where we are in the buffer | |
2203 | * | |
2204 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
2205 | */ | |
2206 | ||
2207 | static int dump_glock(struct gfs2_glock *gl) | |
2208 | { | |
2209 | struct gfs2_holder *gh; | |
2210 | unsigned int x; | |
2211 | int error = -ENOBUFS; | |
2212 | ||
2213 | spin_lock(&gl->gl_spin); | |
2214 | ||
d92a8d48 | 2215 | printk(KERN_INFO "Glock (%u, %llu)\n", |
b3b94faa DT |
2216 | gl->gl_name.ln_type, |
2217 | gl->gl_name.ln_number); | |
d92a8d48 | 2218 | printk(KERN_INFO " gl_flags ="); |
b3b94faa DT |
2219 | for (x = 0; x < 32; x++) |
2220 | if (test_bit(x, &gl->gl_flags)) | |
2221 | printk(" %u", x); | |
2222 | printk(" \n"); | |
d92a8d48 SW |
2223 | printk(KERN_INFO " gl_ref = %d\n", atomic_read(&gl->gl_ref.refcount)); |
2224 | printk(KERN_INFO " gl_state = %u\n", gl->gl_state); | |
2225 | printk(KERN_INFO " req_gh = %s\n", (gl->gl_req_gh) ? "yes" : "no"); | |
2226 | printk(KERN_INFO " req_bh = %s\n", (gl->gl_req_bh) ? "yes" : "no"); | |
2227 | printk(KERN_INFO " lvb_count = %d\n", atomic_read(&gl->gl_lvb_count)); | |
2228 | printk(KERN_INFO " object = %s\n", (gl->gl_object) ? "yes" : "no"); | |
2229 | printk(KERN_INFO " le = %s\n", | |
b3b94faa | 2230 | (list_empty(&gl->gl_le.le_list)) ? "no" : "yes"); |
d92a8d48 | 2231 | printk(KERN_INFO " reclaim = %s\n", |
b3b94faa DT |
2232 | (list_empty(&gl->gl_reclaim)) ? "no" : "yes"); |
2233 | if (gl->gl_aspace) | |
d92a8d48 | 2234 | printk(KERN_INFO " aspace = %lu\n", |
b3b94faa DT |
2235 | gl->gl_aspace->i_mapping->nrpages); |
2236 | else | |
d92a8d48 SW |
2237 | printk(KERN_INFO " aspace = no\n"); |
2238 | printk(KERN_INFO " ail = %d\n", atomic_read(&gl->gl_ail_count)); | |
b3b94faa DT |
2239 | if (gl->gl_req_gh) { |
2240 | error = dump_holder("Request", gl->gl_req_gh); | |
2241 | if (error) | |
2242 | goto out; | |
2243 | } | |
2244 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
2245 | error = dump_holder("Holder", gh); | |
2246 | if (error) | |
2247 | goto out; | |
2248 | } | |
2249 | list_for_each_entry(gh, &gl->gl_waiters1, gh_list) { | |
2250 | error = dump_holder("Waiter1", gh); | |
2251 | if (error) | |
2252 | goto out; | |
2253 | } | |
2254 | list_for_each_entry(gh, &gl->gl_waiters2, gh_list) { | |
2255 | error = dump_holder("Waiter2", gh); | |
2256 | if (error) | |
2257 | goto out; | |
2258 | } | |
2259 | list_for_each_entry(gh, &gl->gl_waiters3, gh_list) { | |
2260 | error = dump_holder("Waiter3", gh); | |
2261 | if (error) | |
2262 | goto out; | |
2263 | } | |
5c676f6d | 2264 | if (gl->gl_ops == &gfs2_inode_glops && gl->gl_object) { |
b3b94faa DT |
2265 | if (!test_bit(GLF_LOCK, &gl->gl_flags) && |
2266 | list_empty(&gl->gl_holders)) { | |
5c676f6d | 2267 | error = dump_inode(gl->gl_object); |
b3b94faa DT |
2268 | if (error) |
2269 | goto out; | |
2270 | } else { | |
2271 | error = -ENOBUFS; | |
d92a8d48 | 2272 | printk(KERN_INFO " Inode: busy\n"); |
b3b94faa DT |
2273 | } |
2274 | } | |
2275 | ||
2276 | error = 0; | |
2277 | ||
2278 | out: | |
2279 | spin_unlock(&gl->gl_spin); | |
2280 | ||
2281 | return error; | |
2282 | } | |
2283 | ||
2284 | /** | |
2285 | * gfs2_dump_lockstate - print out the current lockstate | |
2286 | * @sdp: the filesystem | |
2287 | * @ub: the buffer to copy the information into | |
2288 | * | |
2289 | * If @ub is NULL, dump the lockstate to the console. | |
2290 | * | |
2291 | */ | |
2292 | ||
08bc2dbc | 2293 | static int gfs2_dump_lockstate(struct gfs2_sbd *sdp) |
b3b94faa DT |
2294 | { |
2295 | struct gfs2_gl_hash_bucket *bucket; | |
2296 | struct gfs2_glock *gl; | |
2297 | unsigned int x; | |
2298 | int error = 0; | |
2299 | ||
2300 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) { | |
2301 | bucket = &sdp->sd_gl_hash[x]; | |
2302 | ||
2303 | read_lock(&bucket->hb_lock); | |
2304 | ||
2305 | list_for_each_entry(gl, &bucket->hb_list, gl_list) { | |
2306 | if (test_bit(GLF_PLUG, &gl->gl_flags)) | |
2307 | continue; | |
2308 | ||
2309 | error = dump_glock(gl); | |
2310 | if (error) | |
2311 | break; | |
2312 | } | |
2313 | ||
2314 | read_unlock(&bucket->hb_lock); | |
2315 | ||
2316 | if (error) | |
2317 | break; | |
2318 | } | |
2319 | ||
2320 | ||
2321 | return error; | |
2322 | } | |
2323 |