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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 | ||
08bc2dbc AB |
50 | static int gfs2_dump_lockstate(struct gfs2_sbd *sdp); |
51 | ||
b3b94faa DT |
52 | /** |
53 | * relaxed_state_ok - is a requested lock compatible with the current lock mode? | |
54 | * @actual: the current state of the lock | |
55 | * @requested: the lock state that was requested by the caller | |
56 | * @flags: the modifier flags passed in by the caller | |
57 | * | |
58 | * Returns: 1 if the locks are compatible, 0 otherwise | |
59 | */ | |
60 | ||
61 | static inline int relaxed_state_ok(unsigned int actual, unsigned requested, | |
62 | int flags) | |
63 | { | |
64 | if (actual == requested) | |
65 | return 1; | |
66 | ||
67 | if (flags & GL_EXACT) | |
68 | return 0; | |
69 | ||
70 | if (actual == LM_ST_EXCLUSIVE && requested == LM_ST_SHARED) | |
71 | return 1; | |
72 | ||
73 | if (actual != LM_ST_UNLOCKED && (flags & LM_FLAG_ANY)) | |
74 | return 1; | |
75 | ||
76 | return 0; | |
77 | } | |
78 | ||
79 | /** | |
80 | * gl_hash() - Turn glock number into hash bucket number | |
81 | * @lock: The glock number | |
82 | * | |
83 | * Returns: The number of the corresponding hash bucket | |
84 | */ | |
85 | ||
86 | static unsigned int gl_hash(struct lm_lockname *name) | |
87 | { | |
88 | unsigned int h; | |
89 | ||
90 | h = jhash(&name->ln_number, sizeof(uint64_t), 0); | |
91 | h = jhash(&name->ln_type, sizeof(unsigned int), h); | |
92 | h &= GFS2_GL_HASH_MASK; | |
93 | ||
94 | return h; | |
95 | } | |
96 | ||
97 | /** | |
98 | * glock_free() - Perform a few checks and then release struct gfs2_glock | |
99 | * @gl: The glock to release | |
100 | * | |
101 | * Also calls lock module to release its internal structure for this glock. | |
102 | * | |
103 | */ | |
104 | ||
105 | static void glock_free(struct gfs2_glock *gl) | |
106 | { | |
107 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
108 | struct inode *aspace = gl->gl_aspace; | |
109 | ||
110 | gfs2_lm_put_lock(sdp, gl->gl_lock); | |
111 | ||
112 | if (aspace) | |
113 | gfs2_aspace_put(aspace); | |
114 | ||
115 | kmem_cache_free(gfs2_glock_cachep, gl); | |
b3b94faa DT |
116 | } |
117 | ||
118 | /** | |
119 | * gfs2_glock_hold() - increment reference count on glock | |
120 | * @gl: The glock to hold | |
121 | * | |
122 | */ | |
123 | ||
124 | void gfs2_glock_hold(struct gfs2_glock *gl) | |
125 | { | |
126 | kref_get(&gl->gl_ref); | |
127 | } | |
128 | ||
129 | /* All work is done after the return from kref_put() so we | |
130 | can release the write_lock before the free. */ | |
131 | ||
132 | static void kill_glock(struct kref *kref) | |
133 | { | |
134 | struct gfs2_glock *gl = container_of(kref, struct gfs2_glock, gl_ref); | |
135 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
136 | ||
137 | gfs2_assert(sdp, gl->gl_state == LM_ST_UNLOCKED); | |
138 | gfs2_assert(sdp, list_empty(&gl->gl_reclaim)); | |
139 | gfs2_assert(sdp, list_empty(&gl->gl_holders)); | |
140 | gfs2_assert(sdp, list_empty(&gl->gl_waiters1)); | |
141 | gfs2_assert(sdp, list_empty(&gl->gl_waiters2)); | |
142 | gfs2_assert(sdp, list_empty(&gl->gl_waiters3)); | |
143 | } | |
144 | ||
145 | /** | |
146 | * gfs2_glock_put() - Decrement reference count on glock | |
147 | * @gl: The glock to put | |
148 | * | |
149 | */ | |
150 | ||
151 | int gfs2_glock_put(struct gfs2_glock *gl) | |
152 | { | |
153 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
154 | struct gfs2_gl_hash_bucket *bucket = gl->gl_bucket; | |
155 | int rv = 0; | |
156 | ||
f55ab26a | 157 | mutex_lock(&sdp->sd_invalidate_inodes_mutex); |
b3b94faa DT |
158 | |
159 | write_lock(&bucket->hb_lock); | |
160 | if (kref_put(&gl->gl_ref, kill_glock)) { | |
161 | list_del_init(&gl->gl_list); | |
162 | write_unlock(&bucket->hb_lock); | |
190562bd | 163 | BUG_ON(spin_is_locked(&gl->gl_spin)); |
b3b94faa DT |
164 | glock_free(gl); |
165 | rv = 1; | |
166 | goto out; | |
167 | } | |
168 | write_unlock(&bucket->hb_lock); | |
169 | out: | |
f55ab26a | 170 | mutex_unlock(&sdp->sd_invalidate_inodes_mutex); |
b3b94faa DT |
171 | return rv; |
172 | } | |
173 | ||
174 | /** | |
175 | * queue_empty - check to see if a glock's queue is empty | |
176 | * @gl: the glock | |
177 | * @head: the head of the queue to check | |
178 | * | |
179 | * This function protects the list in the event that a process already | |
180 | * has a holder on the list and is adding a second holder for itself. | |
181 | * The glmutex lock is what generally prevents processes from working | |
182 | * on the same glock at once, but the special case of adding a second | |
183 | * holder for yourself ("recursive" locking) doesn't involve locking | |
184 | * glmutex, making the spin lock necessary. | |
185 | * | |
186 | * Returns: 1 if the queue is empty | |
187 | */ | |
188 | ||
189 | static inline int queue_empty(struct gfs2_glock *gl, struct list_head *head) | |
190 | { | |
191 | int empty; | |
192 | spin_lock(&gl->gl_spin); | |
193 | empty = list_empty(head); | |
194 | spin_unlock(&gl->gl_spin); | |
195 | return empty; | |
196 | } | |
197 | ||
198 | /** | |
199 | * search_bucket() - Find struct gfs2_glock by lock number | |
200 | * @bucket: the bucket to search | |
201 | * @name: The lock name | |
202 | * | |
203 | * Returns: NULL, or the struct gfs2_glock with the requested number | |
204 | */ | |
205 | ||
206 | static struct gfs2_glock *search_bucket(struct gfs2_gl_hash_bucket *bucket, | |
207 | struct lm_lockname *name) | |
208 | { | |
209 | struct gfs2_glock *gl; | |
210 | ||
211 | list_for_each_entry(gl, &bucket->hb_list, gl_list) { | |
212 | if (test_bit(GLF_PLUG, &gl->gl_flags)) | |
213 | continue; | |
214 | if (!lm_name_equal(&gl->gl_name, name)) | |
215 | continue; | |
216 | ||
217 | kref_get(&gl->gl_ref); | |
218 | ||
219 | return gl; | |
220 | } | |
221 | ||
222 | return NULL; | |
223 | } | |
224 | ||
225 | /** | |
226 | * gfs2_glock_find() - Find glock by lock number | |
227 | * @sdp: The GFS2 superblock | |
228 | * @name: The lock name | |
229 | * | |
230 | * Returns: NULL, or the struct gfs2_glock with the requested number | |
231 | */ | |
232 | ||
08bc2dbc AB |
233 | static struct gfs2_glock *gfs2_glock_find(struct gfs2_sbd *sdp, |
234 | struct lm_lockname *name) | |
b3b94faa DT |
235 | { |
236 | struct gfs2_gl_hash_bucket *bucket = &sdp->sd_gl_hash[gl_hash(name)]; | |
237 | struct gfs2_glock *gl; | |
238 | ||
239 | read_lock(&bucket->hb_lock); | |
240 | gl = search_bucket(bucket, name); | |
241 | read_unlock(&bucket->hb_lock); | |
242 | ||
243 | return gl; | |
244 | } | |
245 | ||
246 | /** | |
247 | * gfs2_glock_get() - Get a glock, or create one if one doesn't exist | |
248 | * @sdp: The GFS2 superblock | |
249 | * @number: the lock number | |
250 | * @glops: The glock_operations to use | |
251 | * @create: If 0, don't create the glock if it doesn't exist | |
252 | * @glp: the glock is returned here | |
253 | * | |
254 | * This does not lock a glock, just finds/creates structures for one. | |
255 | * | |
256 | * Returns: errno | |
257 | */ | |
258 | ||
259 | int gfs2_glock_get(struct gfs2_sbd *sdp, uint64_t number, | |
260 | struct gfs2_glock_operations *glops, int create, | |
261 | struct gfs2_glock **glp) | |
262 | { | |
263 | struct lm_lockname name; | |
264 | struct gfs2_glock *gl, *tmp; | |
265 | struct gfs2_gl_hash_bucket *bucket; | |
266 | int error; | |
267 | ||
268 | name.ln_number = number; | |
269 | name.ln_type = glops->go_type; | |
270 | bucket = &sdp->sd_gl_hash[gl_hash(&name)]; | |
271 | ||
272 | read_lock(&bucket->hb_lock); | |
273 | gl = search_bucket(bucket, &name); | |
274 | read_unlock(&bucket->hb_lock); | |
275 | ||
276 | if (gl || !create) { | |
277 | *glp = gl; | |
278 | return 0; | |
279 | } | |
280 | ||
281 | gl = kmem_cache_alloc(gfs2_glock_cachep, GFP_KERNEL); | |
282 | if (!gl) | |
283 | return -ENOMEM; | |
284 | ||
285 | memset(gl, 0, sizeof(struct gfs2_glock)); | |
286 | ||
287 | INIT_LIST_HEAD(&gl->gl_list); | |
288 | gl->gl_name = name; | |
289 | kref_init(&gl->gl_ref); | |
290 | ||
291 | spin_lock_init(&gl->gl_spin); | |
292 | ||
293 | gl->gl_state = LM_ST_UNLOCKED; | |
294 | INIT_LIST_HEAD(&gl->gl_holders); | |
295 | INIT_LIST_HEAD(&gl->gl_waiters1); | |
296 | INIT_LIST_HEAD(&gl->gl_waiters2); | |
297 | INIT_LIST_HEAD(&gl->gl_waiters3); | |
298 | ||
299 | gl->gl_ops = glops; | |
300 | ||
301 | gl->gl_bucket = bucket; | |
302 | INIT_LIST_HEAD(&gl->gl_reclaim); | |
303 | ||
304 | gl->gl_sbd = sdp; | |
305 | ||
306 | lops_init_le(&gl->gl_le, &gfs2_glock_lops); | |
307 | INIT_LIST_HEAD(&gl->gl_ail_list); | |
308 | ||
309 | /* If this glock protects actual on-disk data or metadata blocks, | |
310 | create a VFS inode to manage the pages/buffers holding them. */ | |
311 | if (glops == &gfs2_inode_glops || | |
312 | glops == &gfs2_rgrp_glops || | |
313 | glops == &gfs2_meta_glops) { | |
314 | gl->gl_aspace = gfs2_aspace_get(sdp); | |
315 | if (!gl->gl_aspace) { | |
316 | error = -ENOMEM; | |
317 | goto fail; | |
318 | } | |
319 | } | |
320 | ||
321 | error = gfs2_lm_get_lock(sdp, &name, &gl->gl_lock); | |
322 | if (error) | |
323 | goto fail_aspace; | |
324 | ||
b3b94faa DT |
325 | write_lock(&bucket->hb_lock); |
326 | tmp = search_bucket(bucket, &name); | |
327 | if (tmp) { | |
328 | write_unlock(&bucket->hb_lock); | |
329 | glock_free(gl); | |
330 | gl = tmp; | |
331 | } else { | |
332 | list_add_tail(&gl->gl_list, &bucket->hb_list); | |
333 | write_unlock(&bucket->hb_lock); | |
334 | } | |
335 | ||
336 | *glp = gl; | |
337 | ||
338 | return 0; | |
339 | ||
340 | fail_aspace: | |
341 | if (gl->gl_aspace) | |
342 | gfs2_aspace_put(gl->gl_aspace); | |
343 | ||
344 | fail: | |
345 | kmem_cache_free(gfs2_glock_cachep, gl); | |
346 | ||
347 | return error; | |
348 | } | |
349 | ||
350 | /** | |
351 | * gfs2_holder_init - initialize a struct gfs2_holder in the default way | |
352 | * @gl: the glock | |
353 | * @state: the state we're requesting | |
354 | * @flags: the modifier flags | |
355 | * @gh: the holder structure | |
356 | * | |
357 | */ | |
358 | ||
190562bd | 359 | void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags, |
b3b94faa DT |
360 | struct gfs2_holder *gh) |
361 | { | |
362 | INIT_LIST_HEAD(&gh->gh_list); | |
363 | gh->gh_gl = gl; | |
d0dc80db | 364 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
190562bd | 365 | gh->gh_owner = current; |
b3b94faa DT |
366 | gh->gh_state = state; |
367 | gh->gh_flags = flags; | |
368 | gh->gh_error = 0; | |
369 | gh->gh_iflags = 0; | |
370 | init_completion(&gh->gh_wait); | |
371 | ||
372 | if (gh->gh_state == LM_ST_EXCLUSIVE) | |
373 | gh->gh_flags |= GL_LOCAL_EXCL; | |
374 | ||
375 | gfs2_glock_hold(gl); | |
376 | } | |
377 | ||
378 | /** | |
379 | * gfs2_holder_reinit - reinitialize a struct gfs2_holder so we can requeue it | |
380 | * @state: the state we're requesting | |
381 | * @flags: the modifier flags | |
382 | * @gh: the holder structure | |
383 | * | |
384 | * Don't mess with the glock. | |
385 | * | |
386 | */ | |
387 | ||
190562bd | 388 | void gfs2_holder_reinit(unsigned int state, unsigned flags, struct gfs2_holder *gh) |
b3b94faa DT |
389 | { |
390 | gh->gh_state = state; | |
579b78a4 | 391 | gh->gh_flags = flags; |
b3b94faa DT |
392 | if (gh->gh_state == LM_ST_EXCLUSIVE) |
393 | gh->gh_flags |= GL_LOCAL_EXCL; | |
394 | ||
395 | gh->gh_iflags &= 1 << HIF_ALLOCED; | |
d0dc80db | 396 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
b3b94faa DT |
397 | } |
398 | ||
399 | /** | |
400 | * gfs2_holder_uninit - uninitialize a holder structure (drop glock reference) | |
401 | * @gh: the holder structure | |
402 | * | |
403 | */ | |
404 | ||
405 | void gfs2_holder_uninit(struct gfs2_holder *gh) | |
406 | { | |
407 | gfs2_glock_put(gh->gh_gl); | |
408 | gh->gh_gl = NULL; | |
d0dc80db | 409 | gh->gh_ip = 0; |
b3b94faa DT |
410 | } |
411 | ||
412 | /** | |
413 | * gfs2_holder_get - get a struct gfs2_holder structure | |
414 | * @gl: the glock | |
415 | * @state: the state we're requesting | |
416 | * @flags: the modifier flags | |
417 | * @gfp_flags: __GFP_NOFAIL | |
418 | * | |
419 | * Figure out how big an impact this function has. Either: | |
420 | * 1) Replace it with a cache of structures hanging off the struct gfs2_sbd | |
421 | * 2) Leave it like it is | |
422 | * | |
423 | * Returns: the holder structure, NULL on ENOMEM | |
424 | */ | |
425 | ||
08bc2dbc AB |
426 | static struct gfs2_holder *gfs2_holder_get(struct gfs2_glock *gl, |
427 | unsigned int state, | |
428 | int flags, gfp_t gfp_flags) | |
b3b94faa DT |
429 | { |
430 | struct gfs2_holder *gh; | |
431 | ||
432 | gh = kmalloc(sizeof(struct gfs2_holder), gfp_flags); | |
433 | if (!gh) | |
434 | return NULL; | |
435 | ||
436 | gfs2_holder_init(gl, state, flags, gh); | |
437 | set_bit(HIF_ALLOCED, &gh->gh_iflags); | |
d0dc80db | 438 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
b3b94faa DT |
439 | return gh; |
440 | } | |
441 | ||
442 | /** | |
443 | * gfs2_holder_put - get rid of a struct gfs2_holder structure | |
444 | * @gh: the holder structure | |
445 | * | |
446 | */ | |
447 | ||
08bc2dbc | 448 | static void gfs2_holder_put(struct gfs2_holder *gh) |
b3b94faa DT |
449 | { |
450 | gfs2_holder_uninit(gh); | |
451 | kfree(gh); | |
452 | } | |
453 | ||
b3b94faa DT |
454 | /** |
455 | * rq_mutex - process a mutex request in the queue | |
456 | * @gh: the glock holder | |
457 | * | |
458 | * Returns: 1 if the queue is blocked | |
459 | */ | |
460 | ||
461 | static int rq_mutex(struct gfs2_holder *gh) | |
462 | { | |
463 | struct gfs2_glock *gl = gh->gh_gl; | |
464 | ||
465 | list_del_init(&gh->gh_list); | |
466 | /* gh->gh_error never examined. */ | |
467 | set_bit(GLF_LOCK, &gl->gl_flags); | |
468 | complete(&gh->gh_wait); | |
469 | ||
470 | return 1; | |
471 | } | |
472 | ||
473 | /** | |
474 | * rq_promote - process a promote request in the queue | |
475 | * @gh: the glock holder | |
476 | * | |
477 | * Acquire a new inter-node lock, or change a lock state to more restrictive. | |
478 | * | |
479 | * Returns: 1 if the queue is blocked | |
480 | */ | |
481 | ||
482 | static int rq_promote(struct gfs2_holder *gh) | |
483 | { | |
484 | struct gfs2_glock *gl = gh->gh_gl; | |
485 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
486 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
b3b94faa DT |
487 | |
488 | if (!relaxed_state_ok(gl->gl_state, gh->gh_state, gh->gh_flags)) { | |
489 | if (list_empty(&gl->gl_holders)) { | |
490 | gl->gl_req_gh = gh; | |
491 | set_bit(GLF_LOCK, &gl->gl_flags); | |
492 | spin_unlock(&gl->gl_spin); | |
493 | ||
494 | if (atomic_read(&sdp->sd_reclaim_count) > | |
495 | gfs2_tune_get(sdp, gt_reclaim_limit) && | |
496 | !(gh->gh_flags & LM_FLAG_PRIORITY)) { | |
497 | gfs2_reclaim_glock(sdp); | |
498 | gfs2_reclaim_glock(sdp); | |
499 | } | |
500 | ||
501 | glops->go_xmote_th(gl, gh->gh_state, | |
502 | gh->gh_flags); | |
503 | ||
504 | spin_lock(&gl->gl_spin); | |
505 | } | |
506 | return 1; | |
507 | } | |
508 | ||
509 | if (list_empty(&gl->gl_holders)) { | |
510 | set_bit(HIF_FIRST, &gh->gh_iflags); | |
511 | set_bit(GLF_LOCK, &gl->gl_flags); | |
b3b94faa DT |
512 | } else { |
513 | struct gfs2_holder *next_gh; | |
514 | if (gh->gh_flags & GL_LOCAL_EXCL) | |
515 | return 1; | |
516 | next_gh = list_entry(gl->gl_holders.next, struct gfs2_holder, | |
517 | gh_list); | |
518 | if (next_gh->gh_flags & GL_LOCAL_EXCL) | |
519 | return 1; | |
b3b94faa DT |
520 | } |
521 | ||
522 | list_move_tail(&gh->gh_list, &gl->gl_holders); | |
523 | gh->gh_error = 0; | |
524 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
525 | ||
b3b94faa DT |
526 | complete(&gh->gh_wait); |
527 | ||
528 | return 0; | |
529 | } | |
530 | ||
531 | /** | |
532 | * rq_demote - process a demote request in the queue | |
533 | * @gh: the glock holder | |
534 | * | |
535 | * Returns: 1 if the queue is blocked | |
536 | */ | |
537 | ||
538 | static int rq_demote(struct gfs2_holder *gh) | |
539 | { | |
540 | struct gfs2_glock *gl = gh->gh_gl; | |
541 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
542 | ||
543 | if (!list_empty(&gl->gl_holders)) | |
544 | return 1; | |
545 | ||
546 | if (gl->gl_state == gh->gh_state || gl->gl_state == LM_ST_UNLOCKED) { | |
547 | list_del_init(&gh->gh_list); | |
548 | gh->gh_error = 0; | |
549 | spin_unlock(&gl->gl_spin); | |
550 | if (test_bit(HIF_DEALLOC, &gh->gh_iflags)) | |
551 | gfs2_holder_put(gh); | |
552 | else | |
553 | complete(&gh->gh_wait); | |
554 | spin_lock(&gl->gl_spin); | |
555 | } else { | |
556 | gl->gl_req_gh = gh; | |
557 | set_bit(GLF_LOCK, &gl->gl_flags); | |
558 | spin_unlock(&gl->gl_spin); | |
559 | ||
560 | if (gh->gh_state == LM_ST_UNLOCKED || | |
561 | gl->gl_state != LM_ST_EXCLUSIVE) | |
562 | glops->go_drop_th(gl); | |
563 | else | |
564 | glops->go_xmote_th(gl, gh->gh_state, gh->gh_flags); | |
565 | ||
566 | spin_lock(&gl->gl_spin); | |
567 | } | |
568 | ||
569 | return 0; | |
570 | } | |
571 | ||
572 | /** | |
573 | * rq_greedy - process a queued request to drop greedy status | |
574 | * @gh: the glock holder | |
575 | * | |
576 | * Returns: 1 if the queue is blocked | |
577 | */ | |
578 | ||
579 | static int rq_greedy(struct gfs2_holder *gh) | |
580 | { | |
581 | struct gfs2_glock *gl = gh->gh_gl; | |
582 | ||
583 | list_del_init(&gh->gh_list); | |
584 | /* gh->gh_error never examined. */ | |
585 | clear_bit(GLF_GREEDY, &gl->gl_flags); | |
586 | spin_unlock(&gl->gl_spin); | |
587 | ||
588 | gfs2_holder_uninit(gh); | |
589 | kfree(container_of(gh, struct greedy, gr_gh)); | |
590 | ||
591 | spin_lock(&gl->gl_spin); | |
592 | ||
593 | return 0; | |
594 | } | |
595 | ||
596 | /** | |
597 | * run_queue - process holder structures on a glock | |
598 | * @gl: the glock | |
599 | * | |
600 | */ | |
b3b94faa DT |
601 | static void run_queue(struct gfs2_glock *gl) |
602 | { | |
603 | struct gfs2_holder *gh; | |
604 | int blocked = 1; | |
605 | ||
606 | for (;;) { | |
607 | if (test_bit(GLF_LOCK, &gl->gl_flags)) | |
608 | break; | |
609 | ||
610 | if (!list_empty(&gl->gl_waiters1)) { | |
611 | gh = list_entry(gl->gl_waiters1.next, | |
612 | struct gfs2_holder, gh_list); | |
613 | ||
614 | if (test_bit(HIF_MUTEX, &gh->gh_iflags)) | |
615 | blocked = rq_mutex(gh); | |
616 | else | |
617 | gfs2_assert_warn(gl->gl_sbd, 0); | |
618 | ||
619 | } else if (!list_empty(&gl->gl_waiters2) && | |
620 | !test_bit(GLF_SKIP_WAITERS2, &gl->gl_flags)) { | |
621 | gh = list_entry(gl->gl_waiters2.next, | |
622 | struct gfs2_holder, gh_list); | |
623 | ||
624 | if (test_bit(HIF_DEMOTE, &gh->gh_iflags)) | |
625 | blocked = rq_demote(gh); | |
626 | else if (test_bit(HIF_GREEDY, &gh->gh_iflags)) | |
627 | blocked = rq_greedy(gh); | |
628 | else | |
629 | gfs2_assert_warn(gl->gl_sbd, 0); | |
630 | ||
631 | } else if (!list_empty(&gl->gl_waiters3)) { | |
632 | gh = list_entry(gl->gl_waiters3.next, | |
633 | struct gfs2_holder, gh_list); | |
634 | ||
635 | if (test_bit(HIF_PROMOTE, &gh->gh_iflags)) | |
636 | blocked = rq_promote(gh); | |
637 | else | |
638 | gfs2_assert_warn(gl->gl_sbd, 0); | |
639 | ||
640 | } else | |
641 | break; | |
642 | ||
643 | if (blocked) | |
644 | break; | |
645 | } | |
646 | } | |
647 | ||
648 | /** | |
649 | * gfs2_glmutex_lock - acquire a local lock on a glock | |
650 | * @gl: the glock | |
651 | * | |
652 | * Gives caller exclusive access to manipulate a glock structure. | |
653 | */ | |
654 | ||
655 | void gfs2_glmutex_lock(struct gfs2_glock *gl) | |
656 | { | |
657 | struct gfs2_holder gh; | |
658 | ||
659 | gfs2_holder_init(gl, 0, 0, &gh); | |
660 | set_bit(HIF_MUTEX, &gh.gh_iflags); | |
661 | ||
662 | spin_lock(&gl->gl_spin); | |
663 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) | |
664 | list_add_tail(&gh.gh_list, &gl->gl_waiters1); | |
665 | else | |
666 | complete(&gh.gh_wait); | |
667 | spin_unlock(&gl->gl_spin); | |
668 | ||
669 | wait_for_completion(&gh.gh_wait); | |
670 | gfs2_holder_uninit(&gh); | |
671 | } | |
672 | ||
673 | /** | |
674 | * gfs2_glmutex_trylock - try to acquire a local lock on a glock | |
675 | * @gl: the glock | |
676 | * | |
677 | * Returns: 1 if the glock is acquired | |
678 | */ | |
679 | ||
08bc2dbc | 680 | static int gfs2_glmutex_trylock(struct gfs2_glock *gl) |
b3b94faa DT |
681 | { |
682 | int acquired = 1; | |
683 | ||
684 | spin_lock(&gl->gl_spin); | |
685 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) | |
686 | acquired = 0; | |
687 | spin_unlock(&gl->gl_spin); | |
688 | ||
689 | return acquired; | |
690 | } | |
691 | ||
692 | /** | |
693 | * gfs2_glmutex_unlock - release a local lock on a glock | |
694 | * @gl: the glock | |
695 | * | |
696 | */ | |
697 | ||
698 | void gfs2_glmutex_unlock(struct gfs2_glock *gl) | |
699 | { | |
700 | spin_lock(&gl->gl_spin); | |
701 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
702 | run_queue(gl); | |
190562bd | 703 | BUG_ON(!spin_is_locked(&gl->gl_spin)); |
b3b94faa DT |
704 | spin_unlock(&gl->gl_spin); |
705 | } | |
706 | ||
707 | /** | |
708 | * handle_callback - add a demote request to a lock's queue | |
709 | * @gl: the glock | |
710 | * @state: the state the caller wants us to change to | |
711 | * | |
712 | */ | |
713 | ||
714 | static void handle_callback(struct gfs2_glock *gl, unsigned int state) | |
715 | { | |
716 | struct gfs2_holder *gh, *new_gh = NULL; | |
717 | ||
718 | restart: | |
719 | spin_lock(&gl->gl_spin); | |
720 | ||
721 | list_for_each_entry(gh, &gl->gl_waiters2, gh_list) { | |
722 | if (test_bit(HIF_DEMOTE, &gh->gh_iflags) && | |
723 | gl->gl_req_gh != gh) { | |
724 | if (gh->gh_state != state) | |
725 | gh->gh_state = LM_ST_UNLOCKED; | |
726 | goto out; | |
727 | } | |
728 | } | |
729 | ||
730 | if (new_gh) { | |
731 | list_add_tail(&new_gh->gh_list, &gl->gl_waiters2); | |
732 | new_gh = NULL; | |
733 | } else { | |
734 | spin_unlock(&gl->gl_spin); | |
735 | ||
579b78a4 | 736 | new_gh = gfs2_holder_get(gl, state, LM_FLAG_TRY, |
b3b94faa DT |
737 | GFP_KERNEL | __GFP_NOFAIL), |
738 | set_bit(HIF_DEMOTE, &new_gh->gh_iflags); | |
739 | set_bit(HIF_DEALLOC, &new_gh->gh_iflags); | |
740 | ||
741 | goto restart; | |
742 | } | |
743 | ||
744 | out: | |
745 | spin_unlock(&gl->gl_spin); | |
746 | ||
747 | if (new_gh) | |
748 | gfs2_holder_put(new_gh); | |
749 | } | |
750 | ||
751 | /** | |
752 | * state_change - record that the glock is now in a different state | |
753 | * @gl: the glock | |
754 | * @new_state the new state | |
755 | * | |
756 | */ | |
757 | ||
758 | static void state_change(struct gfs2_glock *gl, unsigned int new_state) | |
759 | { | |
b3b94faa DT |
760 | int held1, held2; |
761 | ||
762 | held1 = (gl->gl_state != LM_ST_UNLOCKED); | |
763 | held2 = (new_state != LM_ST_UNLOCKED); | |
764 | ||
765 | if (held1 != held2) { | |
6a6b3d01 | 766 | if (held2) |
b3b94faa | 767 | gfs2_glock_hold(gl); |
6a6b3d01 | 768 | else |
b3b94faa | 769 | gfs2_glock_put(gl); |
b3b94faa DT |
770 | } |
771 | ||
772 | gl->gl_state = new_state; | |
773 | } | |
774 | ||
775 | /** | |
776 | * xmote_bh - Called after the lock module is done acquiring a lock | |
777 | * @gl: The glock in question | |
778 | * @ret: the int returned from the lock module | |
779 | * | |
780 | */ | |
781 | ||
782 | static void xmote_bh(struct gfs2_glock *gl, unsigned int ret) | |
783 | { | |
784 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
785 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
786 | struct gfs2_holder *gh = gl->gl_req_gh; | |
787 | int prev_state = gl->gl_state; | |
788 | int op_done = 1; | |
789 | ||
790 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
791 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
792 | gfs2_assert_warn(sdp, !(ret & LM_OUT_ASYNC)); | |
793 | ||
794 | state_change(gl, ret & LM_OUT_ST_MASK); | |
795 | ||
796 | if (prev_state != LM_ST_UNLOCKED && !(ret & LM_OUT_CACHEABLE)) { | |
797 | if (glops->go_inval) | |
798 | glops->go_inval(gl, DIO_METADATA | DIO_DATA); | |
799 | } else if (gl->gl_state == LM_ST_DEFERRED) { | |
800 | /* We might not want to do this here. | |
801 | Look at moving to the inode glops. */ | |
802 | if (glops->go_inval) | |
803 | glops->go_inval(gl, DIO_DATA); | |
804 | } | |
805 | ||
806 | /* Deal with each possible exit condition */ | |
807 | ||
808 | if (!gh) | |
809 | gl->gl_stamp = jiffies; | |
810 | ||
811 | else if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) { | |
812 | spin_lock(&gl->gl_spin); | |
813 | list_del_init(&gh->gh_list); | |
814 | gh->gh_error = -EIO; | |
b3b94faa DT |
815 | spin_unlock(&gl->gl_spin); |
816 | ||
817 | } else if (test_bit(HIF_DEMOTE, &gh->gh_iflags)) { | |
818 | spin_lock(&gl->gl_spin); | |
819 | list_del_init(&gh->gh_list); | |
820 | if (gl->gl_state == gh->gh_state || | |
821 | gl->gl_state == LM_ST_UNLOCKED) | |
822 | gh->gh_error = 0; | |
823 | else { | |
824 | if (gfs2_assert_warn(sdp, gh->gh_flags & | |
825 | (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) == -1) | |
826 | fs_warn(sdp, "ret = 0x%.8X\n", ret); | |
827 | gh->gh_error = GLR_TRYFAILED; | |
828 | } | |
829 | spin_unlock(&gl->gl_spin); | |
830 | ||
831 | if (ret & LM_OUT_CANCELED) | |
832 | handle_callback(gl, LM_ST_UNLOCKED); /* Lame */ | |
833 | ||
834 | } else if (ret & LM_OUT_CANCELED) { | |
835 | spin_lock(&gl->gl_spin); | |
836 | list_del_init(&gh->gh_list); | |
837 | gh->gh_error = GLR_CANCELED; | |
b3b94faa DT |
838 | spin_unlock(&gl->gl_spin); |
839 | ||
840 | } else if (relaxed_state_ok(gl->gl_state, gh->gh_state, gh->gh_flags)) { | |
841 | spin_lock(&gl->gl_spin); | |
842 | list_move_tail(&gh->gh_list, &gl->gl_holders); | |
843 | gh->gh_error = 0; | |
844 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
845 | spin_unlock(&gl->gl_spin); | |
846 | ||
847 | set_bit(HIF_FIRST, &gh->gh_iflags); | |
848 | ||
849 | op_done = 0; | |
850 | ||
851 | } else if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { | |
852 | spin_lock(&gl->gl_spin); | |
853 | list_del_init(&gh->gh_list); | |
854 | gh->gh_error = GLR_TRYFAILED; | |
b3b94faa DT |
855 | spin_unlock(&gl->gl_spin); |
856 | ||
857 | } else { | |
858 | if (gfs2_assert_withdraw(sdp, 0) == -1) | |
859 | fs_err(sdp, "ret = 0x%.8X\n", ret); | |
860 | } | |
861 | ||
862 | if (glops->go_xmote_bh) | |
863 | glops->go_xmote_bh(gl); | |
864 | ||
865 | if (op_done) { | |
866 | spin_lock(&gl->gl_spin); | |
867 | gl->gl_req_gh = NULL; | |
868 | gl->gl_req_bh = NULL; | |
869 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
870 | run_queue(gl); | |
871 | spin_unlock(&gl->gl_spin); | |
872 | } | |
873 | ||
874 | gfs2_glock_put(gl); | |
875 | ||
876 | if (gh) { | |
877 | if (test_bit(HIF_DEALLOC, &gh->gh_iflags)) | |
878 | gfs2_holder_put(gh); | |
879 | else | |
880 | complete(&gh->gh_wait); | |
881 | } | |
882 | } | |
883 | ||
884 | /** | |
885 | * gfs2_glock_xmote_th - Call into the lock module to acquire or change a glock | |
886 | * @gl: The glock in question | |
887 | * @state: the requested state | |
888 | * @flags: modifier flags to the lock call | |
889 | * | |
890 | */ | |
891 | ||
892 | void gfs2_glock_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags) | |
893 | { | |
894 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
895 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
896 | int lck_flags = flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB | | |
897 | LM_FLAG_NOEXP | LM_FLAG_ANY | | |
898 | LM_FLAG_PRIORITY); | |
899 | unsigned int lck_ret; | |
900 | ||
901 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
902 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
903 | gfs2_assert_warn(sdp, state != LM_ST_UNLOCKED); | |
904 | gfs2_assert_warn(sdp, state != gl->gl_state); | |
905 | ||
906 | if (gl->gl_state == LM_ST_EXCLUSIVE) { | |
907 | if (glops->go_sync) | |
908 | glops->go_sync(gl, | |
909 | DIO_METADATA | DIO_DATA | DIO_RELEASE); | |
910 | } | |
911 | ||
912 | gfs2_glock_hold(gl); | |
913 | gl->gl_req_bh = xmote_bh; | |
914 | ||
b3b94faa DT |
915 | lck_ret = gfs2_lm_lock(sdp, gl->gl_lock, gl->gl_state, state, |
916 | lck_flags); | |
917 | ||
918 | if (gfs2_assert_withdraw(sdp, !(lck_ret & LM_OUT_ERROR))) | |
919 | return; | |
920 | ||
921 | if (lck_ret & LM_OUT_ASYNC) | |
922 | gfs2_assert_warn(sdp, lck_ret == LM_OUT_ASYNC); | |
923 | else | |
924 | xmote_bh(gl, lck_ret); | |
925 | } | |
926 | ||
927 | /** | |
928 | * drop_bh - Called after a lock module unlock completes | |
929 | * @gl: the glock | |
930 | * @ret: the return status | |
931 | * | |
932 | * Doesn't wake up the process waiting on the struct gfs2_holder (if any) | |
933 | * Doesn't drop the reference on the glock the top half took out | |
934 | * | |
935 | */ | |
936 | ||
937 | static void drop_bh(struct gfs2_glock *gl, unsigned int ret) | |
938 | { | |
939 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
940 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
941 | struct gfs2_holder *gh = gl->gl_req_gh; | |
942 | ||
943 | clear_bit(GLF_PREFETCH, &gl->gl_flags); | |
944 | ||
945 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
946 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
947 | gfs2_assert_warn(sdp, !ret); | |
948 | ||
949 | state_change(gl, LM_ST_UNLOCKED); | |
950 | ||
951 | if (glops->go_inval) | |
952 | glops->go_inval(gl, DIO_METADATA | DIO_DATA); | |
953 | ||
954 | if (gh) { | |
955 | spin_lock(&gl->gl_spin); | |
956 | list_del_init(&gh->gh_list); | |
957 | gh->gh_error = 0; | |
958 | spin_unlock(&gl->gl_spin); | |
959 | } | |
960 | ||
961 | if (glops->go_drop_bh) | |
962 | glops->go_drop_bh(gl); | |
963 | ||
964 | spin_lock(&gl->gl_spin); | |
965 | gl->gl_req_gh = NULL; | |
966 | gl->gl_req_bh = NULL; | |
967 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
968 | run_queue(gl); | |
969 | spin_unlock(&gl->gl_spin); | |
970 | ||
971 | gfs2_glock_put(gl); | |
972 | ||
973 | if (gh) { | |
974 | if (test_bit(HIF_DEALLOC, &gh->gh_iflags)) | |
975 | gfs2_holder_put(gh); | |
976 | else | |
977 | complete(&gh->gh_wait); | |
978 | } | |
979 | } | |
980 | ||
981 | /** | |
982 | * gfs2_glock_drop_th - call into the lock module to unlock a lock | |
983 | * @gl: the glock | |
984 | * | |
985 | */ | |
986 | ||
987 | void gfs2_glock_drop_th(struct gfs2_glock *gl) | |
988 | { | |
989 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
990 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
991 | unsigned int ret; | |
992 | ||
993 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
994 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
995 | gfs2_assert_warn(sdp, gl->gl_state != LM_ST_UNLOCKED); | |
996 | ||
997 | if (gl->gl_state == LM_ST_EXCLUSIVE) { | |
998 | if (glops->go_sync) | |
999 | glops->go_sync(gl, | |
1000 | DIO_METADATA | DIO_DATA | DIO_RELEASE); | |
1001 | } | |
1002 | ||
1003 | gfs2_glock_hold(gl); | |
1004 | gl->gl_req_bh = drop_bh; | |
1005 | ||
b3b94faa DT |
1006 | ret = gfs2_lm_unlock(sdp, gl->gl_lock, gl->gl_state); |
1007 | ||
1008 | if (gfs2_assert_withdraw(sdp, !(ret & LM_OUT_ERROR))) | |
1009 | return; | |
1010 | ||
1011 | if (!ret) | |
1012 | drop_bh(gl, ret); | |
1013 | else | |
1014 | gfs2_assert_warn(sdp, ret == LM_OUT_ASYNC); | |
1015 | } | |
1016 | ||
1017 | /** | |
1018 | * do_cancels - cancel requests for locks stuck waiting on an expire flag | |
1019 | * @gh: the LM_FLAG_PRIORITY holder waiting to acquire the lock | |
1020 | * | |
1021 | * Don't cancel GL_NOCANCEL requests. | |
1022 | */ | |
1023 | ||
1024 | static void do_cancels(struct gfs2_holder *gh) | |
1025 | { | |
1026 | struct gfs2_glock *gl = gh->gh_gl; | |
1027 | ||
1028 | spin_lock(&gl->gl_spin); | |
1029 | ||
1030 | while (gl->gl_req_gh != gh && | |
1031 | !test_bit(HIF_HOLDER, &gh->gh_iflags) && | |
1032 | !list_empty(&gh->gh_list)) { | |
1033 | if (gl->gl_req_bh && | |
1034 | !(gl->gl_req_gh && | |
1035 | (gl->gl_req_gh->gh_flags & GL_NOCANCEL))) { | |
1036 | spin_unlock(&gl->gl_spin); | |
1037 | gfs2_lm_cancel(gl->gl_sbd, gl->gl_lock); | |
1038 | msleep(100); | |
1039 | spin_lock(&gl->gl_spin); | |
1040 | } else { | |
1041 | spin_unlock(&gl->gl_spin); | |
1042 | msleep(100); | |
1043 | spin_lock(&gl->gl_spin); | |
1044 | } | |
1045 | } | |
1046 | ||
1047 | spin_unlock(&gl->gl_spin); | |
1048 | } | |
1049 | ||
1050 | /** | |
1051 | * glock_wait_internal - wait on a glock acquisition | |
1052 | * @gh: the glock holder | |
1053 | * | |
1054 | * Returns: 0 on success | |
1055 | */ | |
1056 | ||
1057 | static int glock_wait_internal(struct gfs2_holder *gh) | |
1058 | { | |
1059 | struct gfs2_glock *gl = gh->gh_gl; | |
1060 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1061 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
1062 | ||
1063 | if (test_bit(HIF_ABORTED, &gh->gh_iflags)) | |
1064 | return -EIO; | |
1065 | ||
1066 | if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { | |
1067 | spin_lock(&gl->gl_spin); | |
1068 | if (gl->gl_req_gh != gh && | |
1069 | !test_bit(HIF_HOLDER, &gh->gh_iflags) && | |
1070 | !list_empty(&gh->gh_list)) { | |
1071 | list_del_init(&gh->gh_list); | |
1072 | gh->gh_error = GLR_TRYFAILED; | |
b3b94faa DT |
1073 | run_queue(gl); |
1074 | spin_unlock(&gl->gl_spin); | |
1075 | return gh->gh_error; | |
1076 | } | |
1077 | spin_unlock(&gl->gl_spin); | |
1078 | } | |
1079 | ||
1080 | if (gh->gh_flags & LM_FLAG_PRIORITY) | |
1081 | do_cancels(gh); | |
1082 | ||
1083 | wait_for_completion(&gh->gh_wait); | |
1084 | ||
1085 | if (gh->gh_error) | |
1086 | return gh->gh_error; | |
1087 | ||
1088 | gfs2_assert_withdraw(sdp, test_bit(HIF_HOLDER, &gh->gh_iflags)); | |
1089 | gfs2_assert_withdraw(sdp, relaxed_state_ok(gl->gl_state, | |
1090 | gh->gh_state, | |
1091 | gh->gh_flags)); | |
1092 | ||
1093 | if (test_bit(HIF_FIRST, &gh->gh_iflags)) { | |
1094 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
1095 | ||
1096 | if (glops->go_lock) { | |
1097 | gh->gh_error = glops->go_lock(gh); | |
1098 | if (gh->gh_error) { | |
1099 | spin_lock(&gl->gl_spin); | |
1100 | list_del_init(&gh->gh_list); | |
b3b94faa DT |
1101 | spin_unlock(&gl->gl_spin); |
1102 | } | |
1103 | } | |
1104 | ||
1105 | spin_lock(&gl->gl_spin); | |
1106 | gl->gl_req_gh = NULL; | |
1107 | gl->gl_req_bh = NULL; | |
1108 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
b3b94faa DT |
1109 | run_queue(gl); |
1110 | spin_unlock(&gl->gl_spin); | |
1111 | } | |
1112 | ||
1113 | return gh->gh_error; | |
1114 | } | |
1115 | ||
1116 | static inline struct gfs2_holder * | |
1117 | find_holder_by_owner(struct list_head *head, struct task_struct *owner) | |
1118 | { | |
1119 | struct gfs2_holder *gh; | |
1120 | ||
1121 | list_for_each_entry(gh, head, gh_list) { | |
1122 | if (gh->gh_owner == owner) | |
1123 | return gh; | |
1124 | } | |
1125 | ||
1126 | return NULL; | |
1127 | } | |
1128 | ||
b3b94faa DT |
1129 | /** |
1130 | * add_to_queue - Add a holder to the wait queue (but look for recursion) | |
1131 | * @gh: the holder structure to add | |
1132 | * | |
1133 | */ | |
1134 | ||
1135 | static void add_to_queue(struct gfs2_holder *gh) | |
1136 | { | |
1137 | struct gfs2_glock *gl = gh->gh_gl; | |
1138 | struct gfs2_holder *existing; | |
1139 | ||
190562bd SW |
1140 | BUG_ON(!gh->gh_owner); |
1141 | ||
b3b94faa DT |
1142 | existing = find_holder_by_owner(&gl->gl_holders, gh->gh_owner); |
1143 | if (existing) { | |
5965b1f4 SW |
1144 | print_symbol(KERN_WARNING "original: %s\n", existing->gh_ip); |
1145 | print_symbol(KERN_WARNING "new: %s\n", gh->gh_ip); | |
1146 | BUG(); | |
b3b94faa DT |
1147 | } |
1148 | ||
1149 | existing = find_holder_by_owner(&gl->gl_waiters3, gh->gh_owner); | |
1150 | if (existing) { | |
5965b1f4 SW |
1151 | print_symbol(KERN_WARNING "original: %s\n", existing->gh_ip); |
1152 | print_symbol(KERN_WARNING "new: %s\n", gh->gh_ip); | |
1153 | BUG(); | |
b3b94faa DT |
1154 | } |
1155 | ||
b3b94faa DT |
1156 | if (gh->gh_flags & LM_FLAG_PRIORITY) |
1157 | list_add(&gh->gh_list, &gl->gl_waiters3); | |
1158 | else | |
1159 | list_add_tail(&gh->gh_list, &gl->gl_waiters3); | |
1160 | } | |
1161 | ||
1162 | /** | |
1163 | * gfs2_glock_nq - enqueue a struct gfs2_holder onto a glock (acquire a glock) | |
1164 | * @gh: the holder structure | |
1165 | * | |
1166 | * if (gh->gh_flags & GL_ASYNC), this never returns an error | |
1167 | * | |
1168 | * Returns: 0, GLR_TRYFAILED, or errno on failure | |
1169 | */ | |
1170 | ||
1171 | int gfs2_glock_nq(struct gfs2_holder *gh) | |
1172 | { | |
1173 | struct gfs2_glock *gl = gh->gh_gl; | |
1174 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1175 | int error = 0; | |
1176 | ||
b3b94faa DT |
1177 | restart: |
1178 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) { | |
1179 | set_bit(HIF_ABORTED, &gh->gh_iflags); | |
1180 | return -EIO; | |
1181 | } | |
1182 | ||
1183 | set_bit(HIF_PROMOTE, &gh->gh_iflags); | |
1184 | ||
1185 | spin_lock(&gl->gl_spin); | |
1186 | add_to_queue(gh); | |
1187 | run_queue(gl); | |
1188 | spin_unlock(&gl->gl_spin); | |
1189 | ||
1190 | if (!(gh->gh_flags & GL_ASYNC)) { | |
1191 | error = glock_wait_internal(gh); | |
1192 | if (error == GLR_CANCELED) { | |
190562bd | 1193 | msleep(100); |
b3b94faa DT |
1194 | goto restart; |
1195 | } | |
1196 | } | |
1197 | ||
1198 | clear_bit(GLF_PREFETCH, &gl->gl_flags); | |
1199 | ||
1200 | return error; | |
1201 | } | |
1202 | ||
1203 | /** | |
1204 | * gfs2_glock_poll - poll to see if an async request has been completed | |
1205 | * @gh: the holder | |
1206 | * | |
1207 | * Returns: 1 if the request is ready to be gfs2_glock_wait()ed on | |
1208 | */ | |
1209 | ||
1210 | int gfs2_glock_poll(struct gfs2_holder *gh) | |
1211 | { | |
1212 | struct gfs2_glock *gl = gh->gh_gl; | |
1213 | int ready = 0; | |
1214 | ||
1215 | spin_lock(&gl->gl_spin); | |
1216 | ||
1217 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
1218 | ready = 1; | |
1219 | else if (list_empty(&gh->gh_list)) { | |
1220 | if (gh->gh_error == GLR_CANCELED) { | |
1221 | spin_unlock(&gl->gl_spin); | |
190562bd | 1222 | msleep(100); |
b3b94faa DT |
1223 | if (gfs2_glock_nq(gh)) |
1224 | return 1; | |
1225 | return 0; | |
1226 | } else | |
1227 | ready = 1; | |
1228 | } | |
1229 | ||
1230 | spin_unlock(&gl->gl_spin); | |
1231 | ||
1232 | return ready; | |
1233 | } | |
1234 | ||
1235 | /** | |
1236 | * gfs2_glock_wait - wait for a lock acquisition that ended in a GLR_ASYNC | |
1237 | * @gh: the holder structure | |
1238 | * | |
1239 | * Returns: 0, GLR_TRYFAILED, or errno on failure | |
1240 | */ | |
1241 | ||
1242 | int gfs2_glock_wait(struct gfs2_holder *gh) | |
1243 | { | |
1244 | int error; | |
1245 | ||
1246 | error = glock_wait_internal(gh); | |
1247 | if (error == GLR_CANCELED) { | |
190562bd | 1248 | msleep(100); |
b3b94faa DT |
1249 | gh->gh_flags &= ~GL_ASYNC; |
1250 | error = gfs2_glock_nq(gh); | |
1251 | } | |
1252 | ||
1253 | return error; | |
1254 | } | |
1255 | ||
1256 | /** | |
1257 | * gfs2_glock_dq - dequeue a struct gfs2_holder from a glock (release a glock) | |
1258 | * @gh: the glock holder | |
1259 | * | |
1260 | */ | |
1261 | ||
1262 | void gfs2_glock_dq(struct gfs2_holder *gh) | |
1263 | { | |
1264 | struct gfs2_glock *gl = gh->gh_gl; | |
b3b94faa DT |
1265 | struct gfs2_glock_operations *glops = gl->gl_ops; |
1266 | ||
b3b94faa DT |
1267 | if (gh->gh_flags & GL_SYNC) |
1268 | set_bit(GLF_SYNC, &gl->gl_flags); | |
1269 | ||
1270 | if (gh->gh_flags & GL_NOCACHE) | |
1271 | handle_callback(gl, LM_ST_UNLOCKED); | |
1272 | ||
1273 | gfs2_glmutex_lock(gl); | |
1274 | ||
1275 | spin_lock(&gl->gl_spin); | |
1276 | list_del_init(&gh->gh_list); | |
1277 | ||
1278 | if (list_empty(&gl->gl_holders)) { | |
1279 | spin_unlock(&gl->gl_spin); | |
1280 | ||
1281 | if (glops->go_unlock) | |
1282 | glops->go_unlock(gh); | |
1283 | ||
1284 | if (test_bit(GLF_SYNC, &gl->gl_flags)) { | |
1285 | if (glops->go_sync) | |
1286 | glops->go_sync(gl, DIO_METADATA | DIO_DATA); | |
1287 | } | |
1288 | ||
1289 | gl->gl_stamp = jiffies; | |
1290 | ||
1291 | spin_lock(&gl->gl_spin); | |
1292 | } | |
1293 | ||
1294 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
1295 | run_queue(gl); | |
1296 | spin_unlock(&gl->gl_spin); | |
1297 | } | |
1298 | ||
1299 | /** | |
1300 | * gfs2_glock_prefetch - Try to prefetch a glock | |
1301 | * @gl: the glock | |
1302 | * @state: the state to prefetch in | |
1303 | * @flags: flags passed to go_xmote_th() | |
1304 | * | |
1305 | */ | |
1306 | ||
08bc2dbc AB |
1307 | static void gfs2_glock_prefetch(struct gfs2_glock *gl, unsigned int state, |
1308 | int flags) | |
b3b94faa DT |
1309 | { |
1310 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
1311 | ||
1312 | spin_lock(&gl->gl_spin); | |
1313 | ||
1314 | if (test_bit(GLF_LOCK, &gl->gl_flags) || | |
1315 | !list_empty(&gl->gl_holders) || | |
1316 | !list_empty(&gl->gl_waiters1) || | |
1317 | !list_empty(&gl->gl_waiters2) || | |
1318 | !list_empty(&gl->gl_waiters3) || | |
1319 | relaxed_state_ok(gl->gl_state, state, flags)) { | |
1320 | spin_unlock(&gl->gl_spin); | |
1321 | return; | |
1322 | } | |
1323 | ||
1324 | set_bit(GLF_PREFETCH, &gl->gl_flags); | |
1325 | set_bit(GLF_LOCK, &gl->gl_flags); | |
1326 | spin_unlock(&gl->gl_spin); | |
1327 | ||
1328 | glops->go_xmote_th(gl, state, flags); | |
b3b94faa DT |
1329 | } |
1330 | ||
1331 | /** | |
1332 | * gfs2_glock_force_drop - Force a glock to be uncached | |
1333 | * @gl: the glock | |
1334 | * | |
1335 | */ | |
08bc2dbc | 1336 | #if 0 |
b3b94faa DT |
1337 | void gfs2_glock_force_drop(struct gfs2_glock *gl) |
1338 | { | |
1339 | struct gfs2_holder gh; | |
1340 | ||
579b78a4 | 1341 | gfs2_holder_init(gl, LM_ST_UNLOCKED, 0, &gh); |
b3b94faa DT |
1342 | set_bit(HIF_DEMOTE, &gh.gh_iflags); |
1343 | ||
1344 | spin_lock(&gl->gl_spin); | |
1345 | list_add_tail(&gh.gh_list, &gl->gl_waiters2); | |
1346 | run_queue(gl); | |
1347 | spin_unlock(&gl->gl_spin); | |
1348 | ||
1349 | wait_for_completion(&gh.gh_wait); | |
1350 | gfs2_holder_uninit(&gh); | |
1351 | } | |
08bc2dbc | 1352 | #endif /* 0 */ |
b3b94faa DT |
1353 | |
1354 | static void greedy_work(void *data) | |
1355 | { | |
e7f5c01c | 1356 | struct greedy *gr = data; |
b3b94faa DT |
1357 | struct gfs2_holder *gh = &gr->gr_gh; |
1358 | struct gfs2_glock *gl = gh->gh_gl; | |
1359 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
1360 | ||
1361 | clear_bit(GLF_SKIP_WAITERS2, &gl->gl_flags); | |
1362 | ||
1363 | if (glops->go_greedy) | |
1364 | glops->go_greedy(gl); | |
1365 | ||
1366 | spin_lock(&gl->gl_spin); | |
1367 | ||
1368 | if (list_empty(&gl->gl_waiters2)) { | |
1369 | clear_bit(GLF_GREEDY, &gl->gl_flags); | |
1370 | spin_unlock(&gl->gl_spin); | |
1371 | gfs2_holder_uninit(gh); | |
1372 | kfree(gr); | |
1373 | } else { | |
1374 | gfs2_glock_hold(gl); | |
1375 | list_add_tail(&gh->gh_list, &gl->gl_waiters2); | |
1376 | run_queue(gl); | |
1377 | spin_unlock(&gl->gl_spin); | |
1378 | gfs2_glock_put(gl); | |
1379 | } | |
1380 | } | |
1381 | ||
1382 | /** | |
1383 | * gfs2_glock_be_greedy - | |
1384 | * @gl: | |
1385 | * @time: | |
1386 | * | |
1387 | * Returns: 0 if go_greedy will be called, 1 otherwise | |
1388 | */ | |
1389 | ||
1390 | int gfs2_glock_be_greedy(struct gfs2_glock *gl, unsigned int time) | |
1391 | { | |
1392 | struct greedy *gr; | |
1393 | struct gfs2_holder *gh; | |
1394 | ||
1395 | if (!time || | |
1396 | gl->gl_sbd->sd_args.ar_localcaching || | |
1397 | test_and_set_bit(GLF_GREEDY, &gl->gl_flags)) | |
1398 | return 1; | |
1399 | ||
1400 | gr = kmalloc(sizeof(struct greedy), GFP_KERNEL); | |
1401 | if (!gr) { | |
1402 | clear_bit(GLF_GREEDY, &gl->gl_flags); | |
1403 | return 1; | |
1404 | } | |
1405 | gh = &gr->gr_gh; | |
1406 | ||
579b78a4 | 1407 | gfs2_holder_init(gl, 0, 0, gh); |
b3b94faa DT |
1408 | set_bit(HIF_GREEDY, &gh->gh_iflags); |
1409 | INIT_WORK(&gr->gr_work, greedy_work, gr); | |
1410 | ||
1411 | set_bit(GLF_SKIP_WAITERS2, &gl->gl_flags); | |
1412 | schedule_delayed_work(&gr->gr_work, time); | |
1413 | ||
1414 | return 0; | |
1415 | } | |
1416 | ||
b3b94faa DT |
1417 | /** |
1418 | * gfs2_glock_dq_uninit - dequeue a holder from a glock and initialize it | |
1419 | * @gh: the holder structure | |
1420 | * | |
1421 | */ | |
1422 | ||
1423 | void gfs2_glock_dq_uninit(struct gfs2_holder *gh) | |
1424 | { | |
1425 | gfs2_glock_dq(gh); | |
1426 | gfs2_holder_uninit(gh); | |
1427 | } | |
1428 | ||
1429 | /** | |
1430 | * gfs2_glock_nq_num - acquire a glock based on lock number | |
1431 | * @sdp: the filesystem | |
1432 | * @number: the lock number | |
1433 | * @glops: the glock operations for the type of glock | |
1434 | * @state: the state to acquire the glock in | |
1435 | * @flags: modifier flags for the aquisition | |
1436 | * @gh: the struct gfs2_holder | |
1437 | * | |
1438 | * Returns: errno | |
1439 | */ | |
1440 | ||
1441 | int gfs2_glock_nq_num(struct gfs2_sbd *sdp, uint64_t number, | |
1442 | struct gfs2_glock_operations *glops, unsigned int state, | |
1443 | int flags, struct gfs2_holder *gh) | |
1444 | { | |
1445 | struct gfs2_glock *gl; | |
1446 | int error; | |
1447 | ||
1448 | error = gfs2_glock_get(sdp, number, glops, CREATE, &gl); | |
1449 | if (!error) { | |
1450 | error = gfs2_glock_nq_init(gl, state, flags, gh); | |
1451 | gfs2_glock_put(gl); | |
1452 | } | |
1453 | ||
1454 | return error; | |
1455 | } | |
1456 | ||
1457 | /** | |
1458 | * glock_compare - Compare two struct gfs2_glock structures for sorting | |
1459 | * @arg_a: the first structure | |
1460 | * @arg_b: the second structure | |
1461 | * | |
1462 | */ | |
1463 | ||
1464 | static int glock_compare(const void *arg_a, const void *arg_b) | |
1465 | { | |
1466 | struct gfs2_holder *gh_a = *(struct gfs2_holder **)arg_a; | |
1467 | struct gfs2_holder *gh_b = *(struct gfs2_holder **)arg_b; | |
1468 | struct lm_lockname *a = &gh_a->gh_gl->gl_name; | |
1469 | struct lm_lockname *b = &gh_b->gh_gl->gl_name; | |
1470 | int ret = 0; | |
1471 | ||
1472 | if (a->ln_number > b->ln_number) | |
1473 | ret = 1; | |
1474 | else if (a->ln_number < b->ln_number) | |
1475 | ret = -1; | |
1476 | else { | |
1477 | if (gh_a->gh_state == LM_ST_SHARED && | |
1478 | gh_b->gh_state == LM_ST_EXCLUSIVE) | |
1479 | ret = 1; | |
1480 | else if (!(gh_a->gh_flags & GL_LOCAL_EXCL) && | |
1481 | (gh_b->gh_flags & GL_LOCAL_EXCL)) | |
1482 | ret = 1; | |
1483 | } | |
1484 | ||
1485 | return ret; | |
1486 | } | |
1487 | ||
1488 | /** | |
1489 | * nq_m_sync - synchonously acquire more than one glock in deadlock free order | |
1490 | * @num_gh: the number of structures | |
1491 | * @ghs: an array of struct gfs2_holder structures | |
1492 | * | |
1493 | * Returns: 0 on success (all glocks acquired), | |
1494 | * errno on failure (no glocks acquired) | |
1495 | */ | |
1496 | ||
1497 | static int nq_m_sync(unsigned int num_gh, struct gfs2_holder *ghs, | |
1498 | struct gfs2_holder **p) | |
1499 | { | |
1500 | unsigned int x; | |
1501 | int error = 0; | |
1502 | ||
1503 | for (x = 0; x < num_gh; x++) | |
1504 | p[x] = &ghs[x]; | |
1505 | ||
1506 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare, NULL); | |
1507 | ||
1508 | for (x = 0; x < num_gh; x++) { | |
1509 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1510 | ||
1511 | error = gfs2_glock_nq(p[x]); | |
1512 | if (error) { | |
1513 | while (x--) | |
1514 | gfs2_glock_dq(p[x]); | |
1515 | break; | |
1516 | } | |
1517 | } | |
1518 | ||
1519 | return error; | |
1520 | } | |
1521 | ||
1522 | /** | |
1523 | * gfs2_glock_nq_m - acquire multiple glocks | |
1524 | * @num_gh: the number of structures | |
1525 | * @ghs: an array of struct gfs2_holder structures | |
1526 | * | |
1527 | * Figure out how big an impact this function has. Either: | |
1528 | * 1) Replace this code with code that calls gfs2_glock_prefetch() | |
1529 | * 2) Forget async stuff and just call nq_m_sync() | |
1530 | * 3) Leave it like it is | |
1531 | * | |
1532 | * Returns: 0 on success (all glocks acquired), | |
1533 | * errno on failure (no glocks acquired) | |
1534 | */ | |
1535 | ||
1536 | int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1537 | { | |
1538 | int *e; | |
1539 | unsigned int x; | |
1540 | int borked = 0, serious = 0; | |
1541 | int error = 0; | |
1542 | ||
1543 | if (!num_gh) | |
1544 | return 0; | |
1545 | ||
1546 | if (num_gh == 1) { | |
1547 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1548 | return gfs2_glock_nq(ghs); | |
1549 | } | |
1550 | ||
1551 | e = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL); | |
1552 | if (!e) | |
1553 | return -ENOMEM; | |
1554 | ||
1555 | for (x = 0; x < num_gh; x++) { | |
1556 | ghs[x].gh_flags |= LM_FLAG_TRY | GL_ASYNC; | |
1557 | error = gfs2_glock_nq(&ghs[x]); | |
1558 | if (error) { | |
1559 | borked = 1; | |
1560 | serious = error; | |
1561 | num_gh = x; | |
1562 | break; | |
1563 | } | |
1564 | } | |
1565 | ||
1566 | for (x = 0; x < num_gh; x++) { | |
1567 | error = e[x] = glock_wait_internal(&ghs[x]); | |
1568 | if (error) { | |
1569 | borked = 1; | |
1570 | if (error != GLR_TRYFAILED && error != GLR_CANCELED) | |
1571 | serious = error; | |
1572 | } | |
1573 | } | |
1574 | ||
1575 | if (!borked) { | |
1576 | kfree(e); | |
1577 | return 0; | |
1578 | } | |
1579 | ||
1580 | for (x = 0; x < num_gh; x++) | |
1581 | if (!e[x]) | |
1582 | gfs2_glock_dq(&ghs[x]); | |
1583 | ||
1584 | if (serious) | |
1585 | error = serious; | |
1586 | else { | |
1587 | for (x = 0; x < num_gh; x++) | |
1588 | gfs2_holder_reinit(ghs[x].gh_state, ghs[x].gh_flags, | |
1589 | &ghs[x]); | |
1590 | error = nq_m_sync(num_gh, ghs, (struct gfs2_holder **)e); | |
1591 | } | |
1592 | ||
1593 | kfree(e); | |
1594 | ||
1595 | return error; | |
1596 | } | |
1597 | ||
1598 | /** | |
1599 | * gfs2_glock_dq_m - release multiple glocks | |
1600 | * @num_gh: the number of structures | |
1601 | * @ghs: an array of struct gfs2_holder structures | |
1602 | * | |
1603 | */ | |
1604 | ||
1605 | void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1606 | { | |
1607 | unsigned int x; | |
1608 | ||
1609 | for (x = 0; x < num_gh; x++) | |
1610 | gfs2_glock_dq(&ghs[x]); | |
1611 | } | |
1612 | ||
1613 | /** | |
1614 | * gfs2_glock_dq_uninit_m - release multiple glocks | |
1615 | * @num_gh: the number of structures | |
1616 | * @ghs: an array of struct gfs2_holder structures | |
1617 | * | |
1618 | */ | |
1619 | ||
1620 | void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1621 | { | |
1622 | unsigned int x; | |
1623 | ||
1624 | for (x = 0; x < num_gh; x++) | |
1625 | gfs2_glock_dq_uninit(&ghs[x]); | |
1626 | } | |
1627 | ||
1628 | /** | |
1629 | * gfs2_glock_prefetch_num - prefetch a glock based on lock number | |
1630 | * @sdp: the filesystem | |
1631 | * @number: the lock number | |
1632 | * @glops: the glock operations for the type of glock | |
1633 | * @state: the state to acquire the glock in | |
1634 | * @flags: modifier flags for the aquisition | |
1635 | * | |
1636 | * Returns: errno | |
1637 | */ | |
1638 | ||
1639 | void gfs2_glock_prefetch_num(struct gfs2_sbd *sdp, uint64_t number, | |
1640 | struct gfs2_glock_operations *glops, | |
1641 | unsigned int state, int flags) | |
1642 | { | |
1643 | struct gfs2_glock *gl; | |
1644 | int error; | |
1645 | ||
1646 | if (atomic_read(&sdp->sd_reclaim_count) < | |
1647 | gfs2_tune_get(sdp, gt_reclaim_limit)) { | |
1648 | error = gfs2_glock_get(sdp, number, glops, CREATE, &gl); | |
1649 | if (!error) { | |
1650 | gfs2_glock_prefetch(gl, state, flags); | |
1651 | gfs2_glock_put(gl); | |
1652 | } | |
1653 | } | |
1654 | } | |
1655 | ||
1656 | /** | |
1657 | * gfs2_lvb_hold - attach a LVB from a glock | |
1658 | * @gl: The glock in question | |
1659 | * | |
1660 | */ | |
1661 | ||
1662 | int gfs2_lvb_hold(struct gfs2_glock *gl) | |
1663 | { | |
1664 | int error; | |
1665 | ||
1666 | gfs2_glmutex_lock(gl); | |
1667 | ||
1668 | if (!atomic_read(&gl->gl_lvb_count)) { | |
1669 | error = gfs2_lm_hold_lvb(gl->gl_sbd, gl->gl_lock, &gl->gl_lvb); | |
1670 | if (error) { | |
1671 | gfs2_glmutex_unlock(gl); | |
1672 | return error; | |
1673 | } | |
1674 | gfs2_glock_hold(gl); | |
1675 | } | |
1676 | atomic_inc(&gl->gl_lvb_count); | |
1677 | ||
1678 | gfs2_glmutex_unlock(gl); | |
1679 | ||
1680 | return 0; | |
1681 | } | |
1682 | ||
1683 | /** | |
1684 | * gfs2_lvb_unhold - detach a LVB from a glock | |
1685 | * @gl: The glock in question | |
1686 | * | |
1687 | */ | |
1688 | ||
1689 | void gfs2_lvb_unhold(struct gfs2_glock *gl) | |
1690 | { | |
1691 | gfs2_glock_hold(gl); | |
1692 | gfs2_glmutex_lock(gl); | |
1693 | ||
1694 | gfs2_assert(gl->gl_sbd, atomic_read(&gl->gl_lvb_count) > 0); | |
1695 | if (atomic_dec_and_test(&gl->gl_lvb_count)) { | |
1696 | gfs2_lm_unhold_lvb(gl->gl_sbd, gl->gl_lock, gl->gl_lvb); | |
1697 | gl->gl_lvb = NULL; | |
1698 | gfs2_glock_put(gl); | |
1699 | } | |
1700 | ||
1701 | gfs2_glmutex_unlock(gl); | |
1702 | gfs2_glock_put(gl); | |
1703 | } | |
1704 | ||
08bc2dbc | 1705 | #if 0 |
b3b94faa DT |
1706 | void gfs2_lvb_sync(struct gfs2_glock *gl) |
1707 | { | |
1708 | gfs2_glmutex_lock(gl); | |
1709 | ||
1710 | gfs2_assert(gl->gl_sbd, atomic_read(&gl->gl_lvb_count)); | |
1711 | if (!gfs2_assert_warn(gl->gl_sbd, gfs2_glock_is_held_excl(gl))) | |
1712 | gfs2_lm_sync_lvb(gl->gl_sbd, gl->gl_lock, gl->gl_lvb); | |
1713 | ||
1714 | gfs2_glmutex_unlock(gl); | |
1715 | } | |
08bc2dbc | 1716 | #endif /* 0 */ |
b3b94faa DT |
1717 | |
1718 | static void blocking_cb(struct gfs2_sbd *sdp, struct lm_lockname *name, | |
1719 | unsigned int state) | |
1720 | { | |
1721 | struct gfs2_glock *gl; | |
1722 | ||
1723 | gl = gfs2_glock_find(sdp, name); | |
1724 | if (!gl) | |
1725 | return; | |
1726 | ||
1727 | if (gl->gl_ops->go_callback) | |
1728 | gl->gl_ops->go_callback(gl, state); | |
1729 | handle_callback(gl, state); | |
1730 | ||
1731 | spin_lock(&gl->gl_spin); | |
1732 | run_queue(gl); | |
1733 | spin_unlock(&gl->gl_spin); | |
1734 | ||
1735 | gfs2_glock_put(gl); | |
1736 | } | |
1737 | ||
1738 | /** | |
1739 | * gfs2_glock_cb - Callback used by locking module | |
1740 | * @fsdata: Pointer to the superblock | |
1741 | * @type: Type of callback | |
1742 | * @data: Type dependent data pointer | |
1743 | * | |
1744 | * Called by the locking module when it wants to tell us something. | |
1745 | * Either we need to drop a lock, one of our ASYNC requests completed, or | |
1746 | * a journal from another client needs to be recovered. | |
1747 | */ | |
1748 | ||
1749 | void gfs2_glock_cb(lm_fsdata_t *fsdata, unsigned int type, void *data) | |
1750 | { | |
1751 | struct gfs2_sbd *sdp = (struct gfs2_sbd *)fsdata; | |
1752 | ||
b3b94faa DT |
1753 | switch (type) { |
1754 | case LM_CB_NEED_E: | |
e7f5c01c | 1755 | blocking_cb(sdp, data, LM_ST_UNLOCKED); |
b3b94faa DT |
1756 | return; |
1757 | ||
1758 | case LM_CB_NEED_D: | |
e7f5c01c | 1759 | blocking_cb(sdp, data, LM_ST_DEFERRED); |
b3b94faa DT |
1760 | return; |
1761 | ||
1762 | case LM_CB_NEED_S: | |
e7f5c01c | 1763 | blocking_cb(sdp, data, LM_ST_SHARED); |
b3b94faa DT |
1764 | return; |
1765 | ||
1766 | case LM_CB_ASYNC: { | |
e7f5c01c | 1767 | struct lm_async_cb *async = data; |
b3b94faa DT |
1768 | struct gfs2_glock *gl; |
1769 | ||
1770 | gl = gfs2_glock_find(sdp, &async->lc_name); | |
1771 | if (gfs2_assert_warn(sdp, gl)) | |
1772 | return; | |
1773 | if (!gfs2_assert_warn(sdp, gl->gl_req_bh)) | |
1774 | gl->gl_req_bh(gl, async->lc_ret); | |
1775 | gfs2_glock_put(gl); | |
b3b94faa DT |
1776 | return; |
1777 | } | |
1778 | ||
1779 | case LM_CB_NEED_RECOVERY: | |
1780 | gfs2_jdesc_make_dirty(sdp, *(unsigned int *)data); | |
1781 | if (sdp->sd_recoverd_process) | |
1782 | wake_up_process(sdp->sd_recoverd_process); | |
1783 | return; | |
1784 | ||
1785 | case LM_CB_DROPLOCKS: | |
1786 | gfs2_gl_hash_clear(sdp, NO_WAIT); | |
1787 | gfs2_quota_scan(sdp); | |
1788 | return; | |
1789 | ||
1790 | default: | |
1791 | gfs2_assert_warn(sdp, 0); | |
1792 | return; | |
1793 | } | |
1794 | } | |
1795 | ||
1796 | /** | |
1797 | * gfs2_try_toss_inode - try to remove a particular inode struct from cache | |
1798 | * sdp: the filesystem | |
1799 | * inum: the inode number | |
1800 | * | |
1801 | */ | |
1802 | ||
1803 | void gfs2_try_toss_inode(struct gfs2_sbd *sdp, struct gfs2_inum *inum) | |
1804 | { | |
1805 | struct gfs2_glock *gl; | |
1806 | struct gfs2_inode *ip; | |
1807 | int error; | |
1808 | ||
1809 | error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, | |
1810 | NO_CREATE, &gl); | |
1811 | if (error || !gl) | |
1812 | return; | |
1813 | ||
1814 | if (!gfs2_glmutex_trylock(gl)) | |
1815 | goto out; | |
1816 | ||
5c676f6d | 1817 | ip = gl->gl_object; |
b3b94faa DT |
1818 | if (!ip) |
1819 | goto out_unlock; | |
1820 | ||
1821 | if (atomic_read(&ip->i_count)) | |
1822 | goto out_unlock; | |
1823 | ||
36327521 | 1824 | gfs2_inode_destroy(ip, 1); |
b3b94faa DT |
1825 | |
1826 | out_unlock: | |
1827 | gfs2_glmutex_unlock(gl); | |
1828 | ||
1829 | out: | |
1830 | gfs2_glock_put(gl); | |
1831 | } | |
1832 | ||
1833 | /** | |
1834 | * gfs2_iopen_go_callback - Try to kick the inode/vnode associated with an | |
1835 | * iopen glock from memory | |
1836 | * @io_gl: the iopen glock | |
1837 | * @state: the state into which the glock should be put | |
1838 | * | |
1839 | */ | |
1840 | ||
1841 | void gfs2_iopen_go_callback(struct gfs2_glock *io_gl, unsigned int state) | |
1842 | { | |
1843 | struct gfs2_glock *i_gl; | |
1844 | ||
1845 | if (state != LM_ST_UNLOCKED) | |
1846 | return; | |
1847 | ||
1848 | spin_lock(&io_gl->gl_spin); | |
5c676f6d | 1849 | i_gl = io_gl->gl_object; |
b3b94faa DT |
1850 | if (i_gl) { |
1851 | gfs2_glock_hold(i_gl); | |
1852 | spin_unlock(&io_gl->gl_spin); | |
1853 | } else { | |
1854 | spin_unlock(&io_gl->gl_spin); | |
1855 | return; | |
1856 | } | |
1857 | ||
1858 | if (gfs2_glmutex_trylock(i_gl)) { | |
5c676f6d | 1859 | struct gfs2_inode *ip = i_gl->gl_object; |
b3b94faa DT |
1860 | if (ip) { |
1861 | gfs2_try_toss_vnode(ip); | |
1862 | gfs2_glmutex_unlock(i_gl); | |
1863 | gfs2_glock_schedule_for_reclaim(i_gl); | |
1864 | goto out; | |
1865 | } | |
1866 | gfs2_glmutex_unlock(i_gl); | |
1867 | } | |
1868 | ||
1869 | out: | |
1870 | gfs2_glock_put(i_gl); | |
1871 | } | |
1872 | ||
1873 | /** | |
1874 | * demote_ok - Check to see if it's ok to unlock a glock | |
1875 | * @gl: the glock | |
1876 | * | |
1877 | * Returns: 1 if it's ok | |
1878 | */ | |
1879 | ||
1880 | static int demote_ok(struct gfs2_glock *gl) | |
1881 | { | |
1882 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1883 | struct gfs2_glock_operations *glops = gl->gl_ops; | |
1884 | int demote = 1; | |
1885 | ||
1886 | if (test_bit(GLF_STICKY, &gl->gl_flags)) | |
1887 | demote = 0; | |
1888 | else if (test_bit(GLF_PREFETCH, &gl->gl_flags)) | |
1889 | demote = time_after_eq(jiffies, | |
1890 | gl->gl_stamp + | |
1891 | gfs2_tune_get(sdp, gt_prefetch_secs) * HZ); | |
1892 | else if (glops->go_demote_ok) | |
1893 | demote = glops->go_demote_ok(gl); | |
1894 | ||
1895 | return demote; | |
1896 | } | |
1897 | ||
1898 | /** | |
1899 | * gfs2_glock_schedule_for_reclaim - Add a glock to the reclaim list | |
1900 | * @gl: the glock | |
1901 | * | |
1902 | */ | |
1903 | ||
1904 | void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl) | |
1905 | { | |
1906 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1907 | ||
1908 | spin_lock(&sdp->sd_reclaim_lock); | |
1909 | if (list_empty(&gl->gl_reclaim)) { | |
1910 | gfs2_glock_hold(gl); | |
1911 | list_add(&gl->gl_reclaim, &sdp->sd_reclaim_list); | |
1912 | atomic_inc(&sdp->sd_reclaim_count); | |
1913 | } | |
1914 | spin_unlock(&sdp->sd_reclaim_lock); | |
1915 | ||
1916 | wake_up(&sdp->sd_reclaim_wq); | |
1917 | } | |
1918 | ||
1919 | /** | |
1920 | * gfs2_reclaim_glock - process the next glock on the filesystem's reclaim list | |
1921 | * @sdp: the filesystem | |
1922 | * | |
1923 | * Called from gfs2_glockd() glock reclaim daemon, or when promoting a | |
1924 | * different glock and we notice that there are a lot of glocks in the | |
1925 | * reclaim list. | |
1926 | * | |
1927 | */ | |
1928 | ||
1929 | void gfs2_reclaim_glock(struct gfs2_sbd *sdp) | |
1930 | { | |
1931 | struct gfs2_glock *gl; | |
1932 | ||
1933 | spin_lock(&sdp->sd_reclaim_lock); | |
1934 | if (list_empty(&sdp->sd_reclaim_list)) { | |
1935 | spin_unlock(&sdp->sd_reclaim_lock); | |
1936 | return; | |
1937 | } | |
1938 | gl = list_entry(sdp->sd_reclaim_list.next, | |
1939 | struct gfs2_glock, gl_reclaim); | |
1940 | list_del_init(&gl->gl_reclaim); | |
1941 | spin_unlock(&sdp->sd_reclaim_lock); | |
1942 | ||
1943 | atomic_dec(&sdp->sd_reclaim_count); | |
1944 | atomic_inc(&sdp->sd_reclaimed); | |
1945 | ||
1946 | if (gfs2_glmutex_trylock(gl)) { | |
1947 | if (gl->gl_ops == &gfs2_inode_glops) { | |
5c676f6d | 1948 | struct gfs2_inode *ip = gl->gl_object; |
b3b94faa | 1949 | if (ip && !atomic_read(&ip->i_count)) |
36327521 | 1950 | gfs2_inode_destroy(ip, 1); |
b3b94faa DT |
1951 | } |
1952 | if (queue_empty(gl, &gl->gl_holders) && | |
1953 | gl->gl_state != LM_ST_UNLOCKED && | |
1954 | demote_ok(gl)) | |
1955 | handle_callback(gl, LM_ST_UNLOCKED); | |
1956 | gfs2_glmutex_unlock(gl); | |
1957 | } | |
1958 | ||
1959 | gfs2_glock_put(gl); | |
1960 | } | |
1961 | ||
1962 | /** | |
1963 | * examine_bucket - Call a function for glock in a hash bucket | |
1964 | * @examiner: the function | |
1965 | * @sdp: the filesystem | |
1966 | * @bucket: the bucket | |
1967 | * | |
1968 | * Returns: 1 if the bucket has entries | |
1969 | */ | |
1970 | ||
1971 | static int examine_bucket(glock_examiner examiner, struct gfs2_sbd *sdp, | |
1972 | struct gfs2_gl_hash_bucket *bucket) | |
1973 | { | |
1974 | struct glock_plug plug; | |
1975 | struct list_head *tmp; | |
1976 | struct gfs2_glock *gl; | |
1977 | int entries; | |
1978 | ||
1979 | /* Add "plug" to end of bucket list, work back up list from there */ | |
1980 | memset(&plug.gl_flags, 0, sizeof(unsigned long)); | |
1981 | set_bit(GLF_PLUG, &plug.gl_flags); | |
1982 | ||
1983 | write_lock(&bucket->hb_lock); | |
1984 | list_add(&plug.gl_list, &bucket->hb_list); | |
1985 | write_unlock(&bucket->hb_lock); | |
1986 | ||
1987 | for (;;) { | |
1988 | write_lock(&bucket->hb_lock); | |
1989 | ||
1990 | for (;;) { | |
1991 | tmp = plug.gl_list.next; | |
1992 | ||
1993 | if (tmp == &bucket->hb_list) { | |
1994 | list_del(&plug.gl_list); | |
1995 | entries = !list_empty(&bucket->hb_list); | |
1996 | write_unlock(&bucket->hb_lock); | |
1997 | return entries; | |
1998 | } | |
1999 | gl = list_entry(tmp, struct gfs2_glock, gl_list); | |
2000 | ||
2001 | /* Move plug up list */ | |
2002 | list_move(&plug.gl_list, &gl->gl_list); | |
2003 | ||
2004 | if (test_bit(GLF_PLUG, &gl->gl_flags)) | |
2005 | continue; | |
2006 | ||
2007 | /* examiner() must glock_put() */ | |
2008 | gfs2_glock_hold(gl); | |
2009 | ||
2010 | break; | |
2011 | } | |
2012 | ||
2013 | write_unlock(&bucket->hb_lock); | |
2014 | ||
2015 | examiner(gl); | |
2016 | } | |
2017 | } | |
2018 | ||
2019 | /** | |
2020 | * scan_glock - look at a glock and see if we can reclaim it | |
2021 | * @gl: the glock to look at | |
2022 | * | |
2023 | */ | |
2024 | ||
2025 | static void scan_glock(struct gfs2_glock *gl) | |
2026 | { | |
2027 | if (gfs2_glmutex_trylock(gl)) { | |
2028 | if (gl->gl_ops == &gfs2_inode_glops) { | |
5c676f6d | 2029 | struct gfs2_inode *ip = gl->gl_object; |
b3b94faa DT |
2030 | if (ip && !atomic_read(&ip->i_count)) |
2031 | goto out_schedule; | |
2032 | } | |
2033 | if (queue_empty(gl, &gl->gl_holders) && | |
2034 | gl->gl_state != LM_ST_UNLOCKED && | |
2035 | demote_ok(gl)) | |
2036 | goto out_schedule; | |
2037 | ||
2038 | gfs2_glmutex_unlock(gl); | |
2039 | } | |
2040 | ||
2041 | gfs2_glock_put(gl); | |
2042 | ||
2043 | return; | |
2044 | ||
2045 | out_schedule: | |
2046 | gfs2_glmutex_unlock(gl); | |
2047 | gfs2_glock_schedule_for_reclaim(gl); | |
2048 | gfs2_glock_put(gl); | |
2049 | } | |
2050 | ||
2051 | /** | |
2052 | * gfs2_scand_internal - Look for glocks and inodes to toss from memory | |
2053 | * @sdp: the filesystem | |
2054 | * | |
2055 | */ | |
2056 | ||
2057 | void gfs2_scand_internal(struct gfs2_sbd *sdp) | |
2058 | { | |
2059 | unsigned int x; | |
2060 | ||
2061 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) { | |
2062 | examine_bucket(scan_glock, sdp, &sdp->sd_gl_hash[x]); | |
2063 | cond_resched(); | |
2064 | } | |
2065 | } | |
2066 | ||
2067 | /** | |
2068 | * clear_glock - look at a glock and see if we can free it from glock cache | |
2069 | * @gl: the glock to look at | |
2070 | * | |
2071 | */ | |
2072 | ||
2073 | static void clear_glock(struct gfs2_glock *gl) | |
2074 | { | |
2075 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
2076 | int released; | |
2077 | ||
2078 | spin_lock(&sdp->sd_reclaim_lock); | |
2079 | if (!list_empty(&gl->gl_reclaim)) { | |
2080 | list_del_init(&gl->gl_reclaim); | |
2081 | atomic_dec(&sdp->sd_reclaim_count); | |
190562bd | 2082 | spin_unlock(&sdp->sd_reclaim_lock); |
b3b94faa DT |
2083 | released = gfs2_glock_put(gl); |
2084 | gfs2_assert(sdp, !released); | |
190562bd SW |
2085 | } else { |
2086 | spin_unlock(&sdp->sd_reclaim_lock); | |
b3b94faa | 2087 | } |
b3b94faa DT |
2088 | |
2089 | if (gfs2_glmutex_trylock(gl)) { | |
2090 | if (gl->gl_ops == &gfs2_inode_glops) { | |
5c676f6d | 2091 | struct gfs2_inode *ip = gl->gl_object; |
b3b94faa | 2092 | if (ip && !atomic_read(&ip->i_count)) |
36327521 | 2093 | gfs2_inode_destroy(ip, 1); |
b3b94faa DT |
2094 | } |
2095 | if (queue_empty(gl, &gl->gl_holders) && | |
2096 | gl->gl_state != LM_ST_UNLOCKED) | |
2097 | handle_callback(gl, LM_ST_UNLOCKED); | |
2098 | ||
2099 | gfs2_glmutex_unlock(gl); | |
2100 | } | |
2101 | ||
2102 | gfs2_glock_put(gl); | |
2103 | } | |
2104 | ||
2105 | /** | |
2106 | * gfs2_gl_hash_clear - Empty out the glock hash table | |
2107 | * @sdp: the filesystem | |
2108 | * @wait: wait until it's all gone | |
2109 | * | |
2110 | * Called when unmounting the filesystem, or when inter-node lock manager | |
2111 | * requests DROPLOCKS because it is running out of capacity. | |
2112 | */ | |
2113 | ||
2114 | void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait) | |
2115 | { | |
2116 | unsigned long t; | |
2117 | unsigned int x; | |
2118 | int cont; | |
2119 | ||
2120 | t = jiffies; | |
2121 | ||
2122 | for (;;) { | |
2123 | cont = 0; | |
2124 | ||
2125 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) | |
2126 | if (examine_bucket(clear_glock, sdp, | |
2127 | &sdp->sd_gl_hash[x])) | |
2128 | cont = 1; | |
2129 | ||
2130 | if (!wait || !cont) | |
2131 | break; | |
2132 | ||
2133 | if (time_after_eq(jiffies, | |
2134 | t + gfs2_tune_get(sdp, gt_stall_secs) * HZ)) { | |
2135 | fs_warn(sdp, "Unmount seems to be stalled. " | |
2136 | "Dumping lock state...\n"); | |
2137 | gfs2_dump_lockstate(sdp); | |
2138 | t = jiffies; | |
2139 | } | |
2140 | ||
2141 | /* invalidate_inodes() requires that the sb inodes list | |
2142 | not change, but an async completion callback for an | |
2143 | unlock can occur which does glock_put() which | |
2144 | can call iput() which will change the sb inodes list. | |
2145 | invalidate_inodes_mutex prevents glock_put()'s during | |
2146 | an invalidate_inodes() */ | |
2147 | ||
f55ab26a | 2148 | mutex_lock(&sdp->sd_invalidate_inodes_mutex); |
b3b94faa | 2149 | invalidate_inodes(sdp->sd_vfs); |
f55ab26a | 2150 | mutex_unlock(&sdp->sd_invalidate_inodes_mutex); |
b3b94faa DT |
2151 | yield(); |
2152 | } | |
2153 | } | |
2154 | ||
2155 | /* | |
2156 | * Diagnostic routines to help debug distributed deadlock | |
2157 | */ | |
2158 | ||
2159 | /** | |
2160 | * dump_holder - print information about a glock holder | |
2161 | * @str: a string naming the type of holder | |
2162 | * @gh: the glock holder | |
2163 | * | |
2164 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
2165 | */ | |
2166 | ||
2167 | static int dump_holder(char *str, struct gfs2_holder *gh) | |
2168 | { | |
2169 | unsigned int x; | |
2170 | int error = -ENOBUFS; | |
2171 | ||
d92a8d48 SW |
2172 | printk(KERN_INFO " %s\n", str); |
2173 | printk(KERN_INFO " owner = %ld\n", | |
b3b94faa | 2174 | (gh->gh_owner) ? (long)gh->gh_owner->pid : -1); |
d92a8d48 SW |
2175 | printk(KERN_INFO " gh_state = %u\n", gh->gh_state); |
2176 | printk(KERN_INFO " gh_flags ="); | |
b3b94faa DT |
2177 | for (x = 0; x < 32; x++) |
2178 | if (gh->gh_flags & (1 << x)) | |
2179 | printk(" %u", x); | |
2180 | printk(" \n"); | |
d92a8d48 SW |
2181 | printk(KERN_INFO " error = %d\n", gh->gh_error); |
2182 | printk(KERN_INFO " gh_iflags ="); | |
b3b94faa DT |
2183 | for (x = 0; x < 32; x++) |
2184 | if (test_bit(x, &gh->gh_iflags)) | |
2185 | printk(" %u", x); | |
2186 | printk(" \n"); | |
d0dc80db | 2187 | print_symbol(KERN_INFO " initialized at: %s\n", gh->gh_ip); |
b3b94faa DT |
2188 | |
2189 | error = 0; | |
2190 | ||
2191 | return error; | |
2192 | } | |
2193 | ||
2194 | /** | |
2195 | * dump_inode - print information about an inode | |
2196 | * @ip: the inode | |
2197 | * | |
2198 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
2199 | */ | |
2200 | ||
2201 | static int dump_inode(struct gfs2_inode *ip) | |
2202 | { | |
2203 | unsigned int x; | |
2204 | int error = -ENOBUFS; | |
2205 | ||
d92a8d48 SW |
2206 | printk(KERN_INFO " Inode:\n"); |
2207 | printk(KERN_INFO " num = %llu %llu\n", | |
b3b94faa | 2208 | ip->i_num.no_formal_ino, ip->i_num.no_addr); |
d92a8d48 SW |
2209 | printk(KERN_INFO " type = %u\n", IF2DT(ip->i_di.di_mode)); |
2210 | printk(KERN_INFO " i_count = %d\n", atomic_read(&ip->i_count)); | |
2211 | printk(KERN_INFO " i_flags ="); | |
b3b94faa DT |
2212 | for (x = 0; x < 32; x++) |
2213 | if (test_bit(x, &ip->i_flags)) | |
2214 | printk(" %u", x); | |
2215 | printk(" \n"); | |
d92a8d48 | 2216 | printk(KERN_INFO " vnode = %s\n", (ip->i_vnode) ? "yes" : "no"); |
b3b94faa DT |
2217 | |
2218 | error = 0; | |
2219 | ||
2220 | return error; | |
2221 | } | |
2222 | ||
2223 | /** | |
2224 | * dump_glock - print information about a glock | |
2225 | * @gl: the glock | |
2226 | * @count: where we are in the buffer | |
2227 | * | |
2228 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
2229 | */ | |
2230 | ||
2231 | static int dump_glock(struct gfs2_glock *gl) | |
2232 | { | |
2233 | struct gfs2_holder *gh; | |
2234 | unsigned int x; | |
2235 | int error = -ENOBUFS; | |
2236 | ||
2237 | spin_lock(&gl->gl_spin); | |
2238 | ||
d92a8d48 | 2239 | printk(KERN_INFO "Glock (%u, %llu)\n", |
b3b94faa DT |
2240 | gl->gl_name.ln_type, |
2241 | gl->gl_name.ln_number); | |
d92a8d48 | 2242 | printk(KERN_INFO " gl_flags ="); |
b3b94faa DT |
2243 | for (x = 0; x < 32; x++) |
2244 | if (test_bit(x, &gl->gl_flags)) | |
2245 | printk(" %u", x); | |
2246 | printk(" \n"); | |
d92a8d48 SW |
2247 | printk(KERN_INFO " gl_ref = %d\n", atomic_read(&gl->gl_ref.refcount)); |
2248 | printk(KERN_INFO " gl_state = %u\n", gl->gl_state); | |
2249 | printk(KERN_INFO " req_gh = %s\n", (gl->gl_req_gh) ? "yes" : "no"); | |
2250 | printk(KERN_INFO " req_bh = %s\n", (gl->gl_req_bh) ? "yes" : "no"); | |
2251 | printk(KERN_INFO " lvb_count = %d\n", atomic_read(&gl->gl_lvb_count)); | |
2252 | printk(KERN_INFO " object = %s\n", (gl->gl_object) ? "yes" : "no"); | |
2253 | printk(KERN_INFO " le = %s\n", | |
b3b94faa | 2254 | (list_empty(&gl->gl_le.le_list)) ? "no" : "yes"); |
d92a8d48 | 2255 | printk(KERN_INFO " reclaim = %s\n", |
b3b94faa DT |
2256 | (list_empty(&gl->gl_reclaim)) ? "no" : "yes"); |
2257 | if (gl->gl_aspace) | |
d92a8d48 | 2258 | printk(KERN_INFO " aspace = %lu\n", |
b3b94faa DT |
2259 | gl->gl_aspace->i_mapping->nrpages); |
2260 | else | |
d92a8d48 SW |
2261 | printk(KERN_INFO " aspace = no\n"); |
2262 | printk(KERN_INFO " ail = %d\n", atomic_read(&gl->gl_ail_count)); | |
b3b94faa DT |
2263 | if (gl->gl_req_gh) { |
2264 | error = dump_holder("Request", gl->gl_req_gh); | |
2265 | if (error) | |
2266 | goto out; | |
2267 | } | |
2268 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
2269 | error = dump_holder("Holder", gh); | |
2270 | if (error) | |
2271 | goto out; | |
2272 | } | |
2273 | list_for_each_entry(gh, &gl->gl_waiters1, gh_list) { | |
2274 | error = dump_holder("Waiter1", gh); | |
2275 | if (error) | |
2276 | goto out; | |
2277 | } | |
2278 | list_for_each_entry(gh, &gl->gl_waiters2, gh_list) { | |
2279 | error = dump_holder("Waiter2", gh); | |
2280 | if (error) | |
2281 | goto out; | |
2282 | } | |
2283 | list_for_each_entry(gh, &gl->gl_waiters3, gh_list) { | |
2284 | error = dump_holder("Waiter3", gh); | |
2285 | if (error) | |
2286 | goto out; | |
2287 | } | |
5c676f6d | 2288 | if (gl->gl_ops == &gfs2_inode_glops && gl->gl_object) { |
b3b94faa DT |
2289 | if (!test_bit(GLF_LOCK, &gl->gl_flags) && |
2290 | list_empty(&gl->gl_holders)) { | |
5c676f6d | 2291 | error = dump_inode(gl->gl_object); |
b3b94faa DT |
2292 | if (error) |
2293 | goto out; | |
2294 | } else { | |
2295 | error = -ENOBUFS; | |
d92a8d48 | 2296 | printk(KERN_INFO " Inode: busy\n"); |
b3b94faa DT |
2297 | } |
2298 | } | |
2299 | ||
2300 | error = 0; | |
2301 | ||
2302 | out: | |
2303 | spin_unlock(&gl->gl_spin); | |
2304 | ||
2305 | return error; | |
2306 | } | |
2307 | ||
2308 | /** | |
2309 | * gfs2_dump_lockstate - print out the current lockstate | |
2310 | * @sdp: the filesystem | |
2311 | * @ub: the buffer to copy the information into | |
2312 | * | |
2313 | * If @ub is NULL, dump the lockstate to the console. | |
2314 | * | |
2315 | */ | |
2316 | ||
08bc2dbc | 2317 | static int gfs2_dump_lockstate(struct gfs2_sbd *sdp) |
b3b94faa DT |
2318 | { |
2319 | struct gfs2_gl_hash_bucket *bucket; | |
2320 | struct gfs2_glock *gl; | |
2321 | unsigned int x; | |
2322 | int error = 0; | |
2323 | ||
2324 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) { | |
2325 | bucket = &sdp->sd_gl_hash[x]; | |
2326 | ||
2327 | read_lock(&bucket->hb_lock); | |
2328 | ||
2329 | list_for_each_entry(gl, &bucket->hb_list, gl_list) { | |
2330 | if (test_bit(GLF_PLUG, &gl->gl_flags)) | |
2331 | continue; | |
2332 | ||
2333 | error = dump_glock(gl); | |
2334 | if (error) | |
2335 | break; | |
2336 | } | |
2337 | ||
2338 | read_unlock(&bucket->hb_lock); | |
2339 | ||
2340 | if (error) | |
2341 | break; | |
2342 | } | |
2343 | ||
2344 | ||
2345 | return error; | |
2346 | } | |
2347 |