Commit | Line | Data |
---|---|---|
b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3a8a9a10 | 3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
b3b94faa DT |
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 | 49 | static int gfs2_dump_lockstate(struct gfs2_sbd *sdp); |
320dd101 | 50 | static int dump_glock(struct gfs2_glock *gl); |
08bc2dbc | 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 | { | |
b3b94faa DT |
153 | struct gfs2_gl_hash_bucket *bucket = gl->gl_bucket; |
154 | int rv = 0; | |
155 | ||
b3b94faa DT |
156 | write_lock(&bucket->hb_lock); |
157 | if (kref_put(&gl->gl_ref, kill_glock)) { | |
158 | list_del_init(&gl->gl_list); | |
159 | write_unlock(&bucket->hb_lock); | |
190562bd | 160 | BUG_ON(spin_is_locked(&gl->gl_spin)); |
b3b94faa DT |
161 | glock_free(gl); |
162 | rv = 1; | |
163 | goto out; | |
164 | } | |
165 | write_unlock(&bucket->hb_lock); | |
a2242db0 | 166 | out: |
b3b94faa DT |
167 | return rv; |
168 | } | |
169 | ||
170 | /** | |
171 | * queue_empty - check to see if a glock's queue is empty | |
172 | * @gl: the glock | |
173 | * @head: the head of the queue to check | |
174 | * | |
175 | * This function protects the list in the event that a process already | |
176 | * has a holder on the list and is adding a second holder for itself. | |
177 | * The glmutex lock is what generally prevents processes from working | |
178 | * on the same glock at once, but the special case of adding a second | |
179 | * holder for yourself ("recursive" locking) doesn't involve locking | |
180 | * glmutex, making the spin lock necessary. | |
181 | * | |
182 | * Returns: 1 if the queue is empty | |
183 | */ | |
184 | ||
185 | static inline int queue_empty(struct gfs2_glock *gl, struct list_head *head) | |
186 | { | |
187 | int empty; | |
188 | spin_lock(&gl->gl_spin); | |
189 | empty = list_empty(head); | |
190 | spin_unlock(&gl->gl_spin); | |
191 | return empty; | |
192 | } | |
193 | ||
194 | /** | |
195 | * search_bucket() - Find struct gfs2_glock by lock number | |
196 | * @bucket: the bucket to search | |
197 | * @name: The lock name | |
198 | * | |
199 | * Returns: NULL, or the struct gfs2_glock with the requested number | |
200 | */ | |
201 | ||
202 | static struct gfs2_glock *search_bucket(struct gfs2_gl_hash_bucket *bucket, | |
203 | struct lm_lockname *name) | |
204 | { | |
205 | struct gfs2_glock *gl; | |
206 | ||
207 | list_for_each_entry(gl, &bucket->hb_list, gl_list) { | |
208 | if (test_bit(GLF_PLUG, &gl->gl_flags)) | |
209 | continue; | |
210 | if (!lm_name_equal(&gl->gl_name, name)) | |
211 | continue; | |
212 | ||
213 | kref_get(&gl->gl_ref); | |
214 | ||
215 | return gl; | |
216 | } | |
217 | ||
218 | return NULL; | |
219 | } | |
220 | ||
221 | /** | |
222 | * gfs2_glock_find() - Find glock by lock number | |
223 | * @sdp: The GFS2 superblock | |
224 | * @name: The lock name | |
225 | * | |
226 | * Returns: NULL, or the struct gfs2_glock with the requested number | |
227 | */ | |
228 | ||
08bc2dbc AB |
229 | static struct gfs2_glock *gfs2_glock_find(struct gfs2_sbd *sdp, |
230 | struct lm_lockname *name) | |
b3b94faa DT |
231 | { |
232 | struct gfs2_gl_hash_bucket *bucket = &sdp->sd_gl_hash[gl_hash(name)]; | |
233 | struct gfs2_glock *gl; | |
234 | ||
235 | read_lock(&bucket->hb_lock); | |
236 | gl = search_bucket(bucket, name); | |
237 | read_unlock(&bucket->hb_lock); | |
238 | ||
239 | return gl; | |
240 | } | |
241 | ||
242 | /** | |
243 | * gfs2_glock_get() - Get a glock, or create one if one doesn't exist | |
244 | * @sdp: The GFS2 superblock | |
245 | * @number: the lock number | |
246 | * @glops: The glock_operations to use | |
247 | * @create: If 0, don't create the glock if it doesn't exist | |
248 | * @glp: the glock is returned here | |
249 | * | |
250 | * This does not lock a glock, just finds/creates structures for one. | |
251 | * | |
252 | * Returns: errno | |
253 | */ | |
254 | ||
255 | int gfs2_glock_get(struct gfs2_sbd *sdp, uint64_t number, | |
8fb4b536 | 256 | const struct gfs2_glock_operations *glops, int create, |
b3b94faa DT |
257 | struct gfs2_glock **glp) |
258 | { | |
259 | struct lm_lockname name; | |
260 | struct gfs2_glock *gl, *tmp; | |
261 | struct gfs2_gl_hash_bucket *bucket; | |
262 | int error; | |
263 | ||
264 | name.ln_number = number; | |
265 | name.ln_type = glops->go_type; | |
266 | bucket = &sdp->sd_gl_hash[gl_hash(&name)]; | |
267 | ||
268 | read_lock(&bucket->hb_lock); | |
269 | gl = search_bucket(bucket, &name); | |
270 | read_unlock(&bucket->hb_lock); | |
271 | ||
272 | if (gl || !create) { | |
273 | *glp = gl; | |
274 | return 0; | |
275 | } | |
276 | ||
277 | gl = kmem_cache_alloc(gfs2_glock_cachep, GFP_KERNEL); | |
278 | if (!gl) | |
279 | return -ENOMEM; | |
280 | ||
281 | memset(gl, 0, sizeof(struct gfs2_glock)); | |
282 | ||
283 | INIT_LIST_HEAD(&gl->gl_list); | |
284 | gl->gl_name = name; | |
285 | kref_init(&gl->gl_ref); | |
286 | ||
287 | spin_lock_init(&gl->gl_spin); | |
288 | ||
289 | gl->gl_state = LM_ST_UNLOCKED; | |
320dd101 SW |
290 | gl->gl_owner = NULL; |
291 | gl->gl_ip = 0; | |
b3b94faa DT |
292 | INIT_LIST_HEAD(&gl->gl_holders); |
293 | INIT_LIST_HEAD(&gl->gl_waiters1); | |
294 | INIT_LIST_HEAD(&gl->gl_waiters2); | |
295 | INIT_LIST_HEAD(&gl->gl_waiters3); | |
296 | ||
297 | gl->gl_ops = glops; | |
298 | ||
299 | gl->gl_bucket = bucket; | |
300 | INIT_LIST_HEAD(&gl->gl_reclaim); | |
301 | ||
302 | gl->gl_sbd = sdp; | |
303 | ||
304 | lops_init_le(&gl->gl_le, &gfs2_glock_lops); | |
305 | INIT_LIST_HEAD(&gl->gl_ail_list); | |
306 | ||
307 | /* If this glock protects actual on-disk data or metadata blocks, | |
308 | create a VFS inode to manage the pages/buffers holding them. */ | |
309 | if (glops == &gfs2_inode_glops || | |
f45b7ddd | 310 | glops == &gfs2_rgrp_glops) { |
b3b94faa DT |
311 | gl->gl_aspace = gfs2_aspace_get(sdp); |
312 | if (!gl->gl_aspace) { | |
313 | error = -ENOMEM; | |
314 | goto fail; | |
315 | } | |
316 | } | |
317 | ||
318 | error = gfs2_lm_get_lock(sdp, &name, &gl->gl_lock); | |
319 | if (error) | |
320 | goto fail_aspace; | |
321 | ||
b3b94faa DT |
322 | write_lock(&bucket->hb_lock); |
323 | tmp = search_bucket(bucket, &name); | |
324 | if (tmp) { | |
325 | write_unlock(&bucket->hb_lock); | |
326 | glock_free(gl); | |
327 | gl = tmp; | |
328 | } else { | |
329 | list_add_tail(&gl->gl_list, &bucket->hb_list); | |
330 | write_unlock(&bucket->hb_lock); | |
331 | } | |
332 | ||
333 | *glp = gl; | |
334 | ||
335 | return 0; | |
336 | ||
337 | fail_aspace: | |
338 | if (gl->gl_aspace) | |
339 | gfs2_aspace_put(gl->gl_aspace); | |
340 | ||
341 | fail: | |
342 | kmem_cache_free(gfs2_glock_cachep, gl); | |
343 | ||
344 | return error; | |
345 | } | |
346 | ||
347 | /** | |
348 | * gfs2_holder_init - initialize a struct gfs2_holder in the default way | |
349 | * @gl: the glock | |
350 | * @state: the state we're requesting | |
351 | * @flags: the modifier flags | |
352 | * @gh: the holder structure | |
353 | * | |
354 | */ | |
355 | ||
190562bd | 356 | void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags, |
b3b94faa DT |
357 | struct gfs2_holder *gh) |
358 | { | |
359 | INIT_LIST_HEAD(&gh->gh_list); | |
360 | gh->gh_gl = gl; | |
d0dc80db | 361 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
190562bd | 362 | gh->gh_owner = current; |
b3b94faa DT |
363 | gh->gh_state = state; |
364 | gh->gh_flags = flags; | |
365 | gh->gh_error = 0; | |
366 | gh->gh_iflags = 0; | |
367 | init_completion(&gh->gh_wait); | |
368 | ||
369 | if (gh->gh_state == LM_ST_EXCLUSIVE) | |
370 | gh->gh_flags |= GL_LOCAL_EXCL; | |
371 | ||
372 | gfs2_glock_hold(gl); | |
373 | } | |
374 | ||
375 | /** | |
376 | * gfs2_holder_reinit - reinitialize a struct gfs2_holder so we can requeue it | |
377 | * @state: the state we're requesting | |
378 | * @flags: the modifier flags | |
379 | * @gh: the holder structure | |
380 | * | |
381 | * Don't mess with the glock. | |
382 | * | |
383 | */ | |
384 | ||
190562bd | 385 | void gfs2_holder_reinit(unsigned int state, unsigned flags, struct gfs2_holder *gh) |
b3b94faa DT |
386 | { |
387 | gh->gh_state = state; | |
579b78a4 | 388 | gh->gh_flags = flags; |
b3b94faa DT |
389 | if (gh->gh_state == LM_ST_EXCLUSIVE) |
390 | gh->gh_flags |= GL_LOCAL_EXCL; | |
391 | ||
392 | gh->gh_iflags &= 1 << HIF_ALLOCED; | |
d0dc80db | 393 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
b3b94faa DT |
394 | } |
395 | ||
396 | /** | |
397 | * gfs2_holder_uninit - uninitialize a holder structure (drop glock reference) | |
398 | * @gh: the holder structure | |
399 | * | |
400 | */ | |
401 | ||
402 | void gfs2_holder_uninit(struct gfs2_holder *gh) | |
403 | { | |
404 | gfs2_glock_put(gh->gh_gl); | |
405 | gh->gh_gl = NULL; | |
d0dc80db | 406 | gh->gh_ip = 0; |
b3b94faa DT |
407 | } |
408 | ||
409 | /** | |
410 | * gfs2_holder_get - get a struct gfs2_holder structure | |
411 | * @gl: the glock | |
412 | * @state: the state we're requesting | |
413 | * @flags: the modifier flags | |
af18ddb8 | 414 | * @gfp_flags: |
b3b94faa DT |
415 | * |
416 | * Figure out how big an impact this function has. Either: | |
417 | * 1) Replace it with a cache of structures hanging off the struct gfs2_sbd | |
418 | * 2) Leave it like it is | |
419 | * | |
420 | * Returns: the holder structure, NULL on ENOMEM | |
421 | */ | |
422 | ||
08bc2dbc AB |
423 | static struct gfs2_holder *gfs2_holder_get(struct gfs2_glock *gl, |
424 | unsigned int state, | |
425 | int flags, gfp_t gfp_flags) | |
b3b94faa DT |
426 | { |
427 | struct gfs2_holder *gh; | |
428 | ||
429 | gh = kmalloc(sizeof(struct gfs2_holder), gfp_flags); | |
430 | if (!gh) | |
431 | return NULL; | |
432 | ||
433 | gfs2_holder_init(gl, state, flags, gh); | |
434 | set_bit(HIF_ALLOCED, &gh->gh_iflags); | |
d0dc80db | 435 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
b3b94faa DT |
436 | return gh; |
437 | } | |
438 | ||
439 | /** | |
440 | * gfs2_holder_put - get rid of a struct gfs2_holder structure | |
441 | * @gh: the holder structure | |
442 | * | |
443 | */ | |
444 | ||
08bc2dbc | 445 | static void gfs2_holder_put(struct gfs2_holder *gh) |
b3b94faa DT |
446 | { |
447 | gfs2_holder_uninit(gh); | |
448 | kfree(gh); | |
449 | } | |
450 | ||
b3b94faa DT |
451 | /** |
452 | * rq_mutex - process a mutex request in the queue | |
453 | * @gh: the glock holder | |
454 | * | |
455 | * Returns: 1 if the queue is blocked | |
456 | */ | |
457 | ||
458 | static int rq_mutex(struct gfs2_holder *gh) | |
459 | { | |
460 | struct gfs2_glock *gl = gh->gh_gl; | |
461 | ||
462 | list_del_init(&gh->gh_list); | |
463 | /* gh->gh_error never examined. */ | |
464 | set_bit(GLF_LOCK, &gl->gl_flags); | |
465 | complete(&gh->gh_wait); | |
466 | ||
467 | return 1; | |
468 | } | |
469 | ||
470 | /** | |
471 | * rq_promote - process a promote request in the queue | |
472 | * @gh: the glock holder | |
473 | * | |
474 | * Acquire a new inter-node lock, or change a lock state to more restrictive. | |
475 | * | |
476 | * Returns: 1 if the queue is blocked | |
477 | */ | |
478 | ||
479 | static int rq_promote(struct gfs2_holder *gh) | |
480 | { | |
481 | struct gfs2_glock *gl = gh->gh_gl; | |
482 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 483 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
484 | |
485 | if (!relaxed_state_ok(gl->gl_state, gh->gh_state, gh->gh_flags)) { | |
486 | if (list_empty(&gl->gl_holders)) { | |
487 | gl->gl_req_gh = gh; | |
488 | set_bit(GLF_LOCK, &gl->gl_flags); | |
489 | spin_unlock(&gl->gl_spin); | |
490 | ||
491 | if (atomic_read(&sdp->sd_reclaim_count) > | |
492 | gfs2_tune_get(sdp, gt_reclaim_limit) && | |
493 | !(gh->gh_flags & LM_FLAG_PRIORITY)) { | |
494 | gfs2_reclaim_glock(sdp); | |
495 | gfs2_reclaim_glock(sdp); | |
496 | } | |
497 | ||
498 | glops->go_xmote_th(gl, gh->gh_state, | |
499 | gh->gh_flags); | |
500 | ||
501 | spin_lock(&gl->gl_spin); | |
502 | } | |
503 | return 1; | |
504 | } | |
505 | ||
506 | if (list_empty(&gl->gl_holders)) { | |
507 | set_bit(HIF_FIRST, &gh->gh_iflags); | |
508 | set_bit(GLF_LOCK, &gl->gl_flags); | |
b3b94faa DT |
509 | } else { |
510 | struct gfs2_holder *next_gh; | |
511 | if (gh->gh_flags & GL_LOCAL_EXCL) | |
512 | return 1; | |
513 | next_gh = list_entry(gl->gl_holders.next, struct gfs2_holder, | |
514 | gh_list); | |
515 | if (next_gh->gh_flags & GL_LOCAL_EXCL) | |
516 | return 1; | |
b3b94faa DT |
517 | } |
518 | ||
519 | list_move_tail(&gh->gh_list, &gl->gl_holders); | |
520 | gh->gh_error = 0; | |
521 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
522 | ||
b3b94faa DT |
523 | complete(&gh->gh_wait); |
524 | ||
525 | return 0; | |
526 | } | |
527 | ||
528 | /** | |
529 | * rq_demote - process a demote request in the queue | |
530 | * @gh: the glock holder | |
531 | * | |
532 | * Returns: 1 if the queue is blocked | |
533 | */ | |
534 | ||
535 | static int rq_demote(struct gfs2_holder *gh) | |
536 | { | |
537 | struct gfs2_glock *gl = gh->gh_gl; | |
8fb4b536 | 538 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
539 | |
540 | if (!list_empty(&gl->gl_holders)) | |
541 | return 1; | |
542 | ||
543 | if (gl->gl_state == gh->gh_state || gl->gl_state == LM_ST_UNLOCKED) { | |
544 | list_del_init(&gh->gh_list); | |
545 | gh->gh_error = 0; | |
546 | spin_unlock(&gl->gl_spin); | |
547 | if (test_bit(HIF_DEALLOC, &gh->gh_iflags)) | |
548 | gfs2_holder_put(gh); | |
549 | else | |
550 | complete(&gh->gh_wait); | |
551 | spin_lock(&gl->gl_spin); | |
552 | } else { | |
553 | gl->gl_req_gh = gh; | |
554 | set_bit(GLF_LOCK, &gl->gl_flags); | |
555 | spin_unlock(&gl->gl_spin); | |
556 | ||
557 | if (gh->gh_state == LM_ST_UNLOCKED || | |
558 | gl->gl_state != LM_ST_EXCLUSIVE) | |
559 | glops->go_drop_th(gl); | |
560 | else | |
561 | glops->go_xmote_th(gl, gh->gh_state, gh->gh_flags); | |
562 | ||
563 | spin_lock(&gl->gl_spin); | |
564 | } | |
565 | ||
566 | return 0; | |
567 | } | |
568 | ||
569 | /** | |
570 | * rq_greedy - process a queued request to drop greedy status | |
571 | * @gh: the glock holder | |
572 | * | |
573 | * Returns: 1 if the queue is blocked | |
574 | */ | |
575 | ||
576 | static int rq_greedy(struct gfs2_holder *gh) | |
577 | { | |
578 | struct gfs2_glock *gl = gh->gh_gl; | |
579 | ||
580 | list_del_init(&gh->gh_list); | |
581 | /* gh->gh_error never examined. */ | |
582 | clear_bit(GLF_GREEDY, &gl->gl_flags); | |
583 | spin_unlock(&gl->gl_spin); | |
584 | ||
585 | gfs2_holder_uninit(gh); | |
586 | kfree(container_of(gh, struct greedy, gr_gh)); | |
587 | ||
588 | spin_lock(&gl->gl_spin); | |
589 | ||
590 | return 0; | |
591 | } | |
592 | ||
593 | /** | |
594 | * run_queue - process holder structures on a glock | |
595 | * @gl: the glock | |
596 | * | |
597 | */ | |
b3b94faa DT |
598 | static void run_queue(struct gfs2_glock *gl) |
599 | { | |
600 | struct gfs2_holder *gh; | |
601 | int blocked = 1; | |
602 | ||
603 | for (;;) { | |
604 | if (test_bit(GLF_LOCK, &gl->gl_flags)) | |
605 | break; | |
606 | ||
607 | if (!list_empty(&gl->gl_waiters1)) { | |
608 | gh = list_entry(gl->gl_waiters1.next, | |
609 | struct gfs2_holder, gh_list); | |
610 | ||
611 | if (test_bit(HIF_MUTEX, &gh->gh_iflags)) | |
612 | blocked = rq_mutex(gh); | |
613 | else | |
614 | gfs2_assert_warn(gl->gl_sbd, 0); | |
615 | ||
616 | } else if (!list_empty(&gl->gl_waiters2) && | |
617 | !test_bit(GLF_SKIP_WAITERS2, &gl->gl_flags)) { | |
618 | gh = list_entry(gl->gl_waiters2.next, | |
619 | struct gfs2_holder, gh_list); | |
620 | ||
621 | if (test_bit(HIF_DEMOTE, &gh->gh_iflags)) | |
622 | blocked = rq_demote(gh); | |
623 | else if (test_bit(HIF_GREEDY, &gh->gh_iflags)) | |
624 | blocked = rq_greedy(gh); | |
625 | else | |
626 | gfs2_assert_warn(gl->gl_sbd, 0); | |
627 | ||
628 | } else if (!list_empty(&gl->gl_waiters3)) { | |
629 | gh = list_entry(gl->gl_waiters3.next, | |
630 | struct gfs2_holder, gh_list); | |
631 | ||
632 | if (test_bit(HIF_PROMOTE, &gh->gh_iflags)) | |
633 | blocked = rq_promote(gh); | |
634 | else | |
635 | gfs2_assert_warn(gl->gl_sbd, 0); | |
636 | ||
637 | } else | |
638 | break; | |
639 | ||
640 | if (blocked) | |
641 | break; | |
642 | } | |
643 | } | |
644 | ||
645 | /** | |
646 | * gfs2_glmutex_lock - acquire a local lock on a glock | |
647 | * @gl: the glock | |
648 | * | |
649 | * Gives caller exclusive access to manipulate a glock structure. | |
650 | */ | |
651 | ||
feaa7bba | 652 | static void gfs2_glmutex_lock(struct gfs2_glock *gl) |
b3b94faa DT |
653 | { |
654 | struct gfs2_holder gh; | |
655 | ||
656 | gfs2_holder_init(gl, 0, 0, &gh); | |
657 | set_bit(HIF_MUTEX, &gh.gh_iflags); | |
658 | ||
659 | spin_lock(&gl->gl_spin); | |
660 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) | |
661 | list_add_tail(&gh.gh_list, &gl->gl_waiters1); | |
320dd101 SW |
662 | else { |
663 | gl->gl_owner = current; | |
664 | gl->gl_ip = (unsigned long)__builtin_return_address(0); | |
b3b94faa | 665 | complete(&gh.gh_wait); |
320dd101 | 666 | } |
b3b94faa DT |
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; | |
320dd101 SW |
687 | else { |
688 | gl->gl_owner = current; | |
689 | gl->gl_ip = (unsigned long)__builtin_return_address(0); | |
690 | } | |
b3b94faa DT |
691 | spin_unlock(&gl->gl_spin); |
692 | ||
693 | return acquired; | |
694 | } | |
695 | ||
696 | /** | |
697 | * gfs2_glmutex_unlock - release a local lock on a glock | |
698 | * @gl: the glock | |
699 | * | |
700 | */ | |
701 | ||
feaa7bba | 702 | static void gfs2_glmutex_unlock(struct gfs2_glock *gl) |
b3b94faa DT |
703 | { |
704 | spin_lock(&gl->gl_spin); | |
705 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
320dd101 SW |
706 | gl->gl_owner = NULL; |
707 | gl->gl_ip = 0; | |
b3b94faa | 708 | run_queue(gl); |
190562bd | 709 | BUG_ON(!spin_is_locked(&gl->gl_spin)); |
b3b94faa DT |
710 | spin_unlock(&gl->gl_spin); |
711 | } | |
712 | ||
713 | /** | |
714 | * handle_callback - add a demote request to a lock's queue | |
715 | * @gl: the glock | |
716 | * @state: the state the caller wants us to change to | |
717 | * | |
af18ddb8 | 718 | * Note: This may fail sliently if we are out of memory. |
b3b94faa DT |
719 | */ |
720 | ||
721 | static void handle_callback(struct gfs2_glock *gl, unsigned int state) | |
722 | { | |
723 | struct gfs2_holder *gh, *new_gh = NULL; | |
724 | ||
feaa7bba | 725 | restart: |
b3b94faa DT |
726 | spin_lock(&gl->gl_spin); |
727 | ||
728 | list_for_each_entry(gh, &gl->gl_waiters2, gh_list) { | |
729 | if (test_bit(HIF_DEMOTE, &gh->gh_iflags) && | |
730 | gl->gl_req_gh != gh) { | |
731 | if (gh->gh_state != state) | |
732 | gh->gh_state = LM_ST_UNLOCKED; | |
733 | goto out; | |
734 | } | |
735 | } | |
736 | ||
737 | if (new_gh) { | |
738 | list_add_tail(&new_gh->gh_list, &gl->gl_waiters2); | |
739 | new_gh = NULL; | |
740 | } else { | |
741 | spin_unlock(&gl->gl_spin); | |
742 | ||
af18ddb8 SW |
743 | new_gh = gfs2_holder_get(gl, state, LM_FLAG_TRY, GFP_KERNEL); |
744 | if (!new_gh) | |
745 | return; | |
b3b94faa DT |
746 | set_bit(HIF_DEMOTE, &new_gh->gh_iflags); |
747 | set_bit(HIF_DEALLOC, &new_gh->gh_iflags); | |
748 | ||
749 | goto restart; | |
750 | } | |
751 | ||
feaa7bba | 752 | out: |
b3b94faa DT |
753 | spin_unlock(&gl->gl_spin); |
754 | ||
755 | if (new_gh) | |
756 | gfs2_holder_put(new_gh); | |
757 | } | |
758 | ||
feaa7bba SW |
759 | void gfs2_glock_inode_squish(struct inode *inode) |
760 | { | |
761 | struct gfs2_holder gh; | |
762 | struct gfs2_glock *gl = GFS2_I(inode)->i_gl; | |
763 | gfs2_holder_init(gl, LM_ST_UNLOCKED, 0, &gh); | |
764 | set_bit(HIF_DEMOTE, &gh.gh_iflags); | |
765 | spin_lock(&gl->gl_spin); | |
766 | gfs2_assert(inode->i_sb->s_fs_info, list_empty(&gl->gl_holders)); | |
767 | list_add_tail(&gh.gh_list, &gl->gl_waiters2); | |
768 | run_queue(gl); | |
769 | spin_unlock(&gl->gl_spin); | |
5dd9feaf | 770 | wait_for_completion(&gh.gh_wait); |
feaa7bba SW |
771 | gfs2_holder_uninit(&gh); |
772 | } | |
773 | ||
b3b94faa DT |
774 | /** |
775 | * state_change - record that the glock is now in a different state | |
776 | * @gl: the glock | |
777 | * @new_state the new state | |
778 | * | |
779 | */ | |
780 | ||
781 | static void state_change(struct gfs2_glock *gl, unsigned int new_state) | |
782 | { | |
b3b94faa DT |
783 | int held1, held2; |
784 | ||
785 | held1 = (gl->gl_state != LM_ST_UNLOCKED); | |
786 | held2 = (new_state != LM_ST_UNLOCKED); | |
787 | ||
788 | if (held1 != held2) { | |
6a6b3d01 | 789 | if (held2) |
b3b94faa | 790 | gfs2_glock_hold(gl); |
6a6b3d01 | 791 | else |
b3b94faa | 792 | gfs2_glock_put(gl); |
b3b94faa DT |
793 | } |
794 | ||
795 | gl->gl_state = new_state; | |
796 | } | |
797 | ||
798 | /** | |
799 | * xmote_bh - Called after the lock module is done acquiring a lock | |
800 | * @gl: The glock in question | |
801 | * @ret: the int returned from the lock module | |
802 | * | |
803 | */ | |
804 | ||
805 | static void xmote_bh(struct gfs2_glock *gl, unsigned int ret) | |
806 | { | |
807 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 808 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
809 | struct gfs2_holder *gh = gl->gl_req_gh; |
810 | int prev_state = gl->gl_state; | |
811 | int op_done = 1; | |
812 | ||
813 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
814 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
815 | gfs2_assert_warn(sdp, !(ret & LM_OUT_ASYNC)); | |
816 | ||
817 | state_change(gl, ret & LM_OUT_ST_MASK); | |
818 | ||
819 | if (prev_state != LM_ST_UNLOCKED && !(ret & LM_OUT_CACHEABLE)) { | |
820 | if (glops->go_inval) | |
821 | glops->go_inval(gl, DIO_METADATA | DIO_DATA); | |
822 | } else if (gl->gl_state == LM_ST_DEFERRED) { | |
823 | /* We might not want to do this here. | |
824 | Look at moving to the inode glops. */ | |
825 | if (glops->go_inval) | |
826 | glops->go_inval(gl, DIO_DATA); | |
827 | } | |
828 | ||
829 | /* Deal with each possible exit condition */ | |
830 | ||
831 | if (!gh) | |
832 | gl->gl_stamp = jiffies; | |
833 | ||
834 | else if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) { | |
835 | spin_lock(&gl->gl_spin); | |
836 | list_del_init(&gh->gh_list); | |
837 | gh->gh_error = -EIO; | |
b3b94faa DT |
838 | spin_unlock(&gl->gl_spin); |
839 | ||
840 | } else if (test_bit(HIF_DEMOTE, &gh->gh_iflags)) { | |
841 | spin_lock(&gl->gl_spin); | |
842 | list_del_init(&gh->gh_list); | |
843 | if (gl->gl_state == gh->gh_state || | |
844 | gl->gl_state == LM_ST_UNLOCKED) | |
845 | gh->gh_error = 0; | |
846 | else { | |
847 | if (gfs2_assert_warn(sdp, gh->gh_flags & | |
848 | (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) == -1) | |
849 | fs_warn(sdp, "ret = 0x%.8X\n", ret); | |
850 | gh->gh_error = GLR_TRYFAILED; | |
851 | } | |
852 | spin_unlock(&gl->gl_spin); | |
853 | ||
854 | if (ret & LM_OUT_CANCELED) | |
855 | handle_callback(gl, LM_ST_UNLOCKED); /* Lame */ | |
856 | ||
857 | } else if (ret & LM_OUT_CANCELED) { | |
858 | spin_lock(&gl->gl_spin); | |
859 | list_del_init(&gh->gh_list); | |
860 | gh->gh_error = GLR_CANCELED; | |
b3b94faa DT |
861 | spin_unlock(&gl->gl_spin); |
862 | ||
863 | } else if (relaxed_state_ok(gl->gl_state, gh->gh_state, gh->gh_flags)) { | |
864 | spin_lock(&gl->gl_spin); | |
865 | list_move_tail(&gh->gh_list, &gl->gl_holders); | |
866 | gh->gh_error = 0; | |
867 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
868 | spin_unlock(&gl->gl_spin); | |
869 | ||
870 | set_bit(HIF_FIRST, &gh->gh_iflags); | |
871 | ||
872 | op_done = 0; | |
873 | ||
874 | } else if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { | |
875 | spin_lock(&gl->gl_spin); | |
876 | list_del_init(&gh->gh_list); | |
877 | gh->gh_error = GLR_TRYFAILED; | |
b3b94faa DT |
878 | spin_unlock(&gl->gl_spin); |
879 | ||
880 | } else { | |
881 | if (gfs2_assert_withdraw(sdp, 0) == -1) | |
882 | fs_err(sdp, "ret = 0x%.8X\n", ret); | |
883 | } | |
884 | ||
885 | if (glops->go_xmote_bh) | |
886 | glops->go_xmote_bh(gl); | |
887 | ||
888 | if (op_done) { | |
889 | spin_lock(&gl->gl_spin); | |
890 | gl->gl_req_gh = NULL; | |
891 | gl->gl_req_bh = NULL; | |
892 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
893 | run_queue(gl); | |
894 | spin_unlock(&gl->gl_spin); | |
895 | } | |
896 | ||
897 | gfs2_glock_put(gl); | |
898 | ||
899 | if (gh) { | |
900 | if (test_bit(HIF_DEALLOC, &gh->gh_iflags)) | |
901 | gfs2_holder_put(gh); | |
902 | else | |
903 | complete(&gh->gh_wait); | |
904 | } | |
905 | } | |
906 | ||
907 | /** | |
908 | * gfs2_glock_xmote_th - Call into the lock module to acquire or change a glock | |
909 | * @gl: The glock in question | |
910 | * @state: the requested state | |
911 | * @flags: modifier flags to the lock call | |
912 | * | |
913 | */ | |
914 | ||
915 | void gfs2_glock_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags) | |
916 | { | |
917 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 918 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
919 | int lck_flags = flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB | |
920 | LM_FLAG_NOEXP | LM_FLAG_ANY | | |
921 | LM_FLAG_PRIORITY); | |
922 | unsigned int lck_ret; | |
923 | ||
924 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
925 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
926 | gfs2_assert_warn(sdp, state != LM_ST_UNLOCKED); | |
927 | gfs2_assert_warn(sdp, state != gl->gl_state); | |
928 | ||
929 | if (gl->gl_state == LM_ST_EXCLUSIVE) { | |
930 | if (glops->go_sync) | |
931 | glops->go_sync(gl, | |
932 | DIO_METADATA | DIO_DATA | DIO_RELEASE); | |
933 | } | |
934 | ||
935 | gfs2_glock_hold(gl); | |
936 | gl->gl_req_bh = xmote_bh; | |
937 | ||
b3b94faa DT |
938 | lck_ret = gfs2_lm_lock(sdp, gl->gl_lock, gl->gl_state, state, |
939 | lck_flags); | |
940 | ||
941 | if (gfs2_assert_withdraw(sdp, !(lck_ret & LM_OUT_ERROR))) | |
942 | return; | |
943 | ||
944 | if (lck_ret & LM_OUT_ASYNC) | |
945 | gfs2_assert_warn(sdp, lck_ret == LM_OUT_ASYNC); | |
946 | else | |
947 | xmote_bh(gl, lck_ret); | |
948 | } | |
949 | ||
950 | /** | |
951 | * drop_bh - Called after a lock module unlock completes | |
952 | * @gl: the glock | |
953 | * @ret: the return status | |
954 | * | |
955 | * Doesn't wake up the process waiting on the struct gfs2_holder (if any) | |
956 | * Doesn't drop the reference on the glock the top half took out | |
957 | * | |
958 | */ | |
959 | ||
960 | static void drop_bh(struct gfs2_glock *gl, unsigned int ret) | |
961 | { | |
962 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 963 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
964 | struct gfs2_holder *gh = gl->gl_req_gh; |
965 | ||
966 | clear_bit(GLF_PREFETCH, &gl->gl_flags); | |
967 | ||
968 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
969 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
970 | gfs2_assert_warn(sdp, !ret); | |
971 | ||
972 | state_change(gl, LM_ST_UNLOCKED); | |
973 | ||
974 | if (glops->go_inval) | |
975 | glops->go_inval(gl, DIO_METADATA | DIO_DATA); | |
976 | ||
977 | if (gh) { | |
978 | spin_lock(&gl->gl_spin); | |
979 | list_del_init(&gh->gh_list); | |
980 | gh->gh_error = 0; | |
981 | spin_unlock(&gl->gl_spin); | |
982 | } | |
983 | ||
984 | if (glops->go_drop_bh) | |
985 | glops->go_drop_bh(gl); | |
986 | ||
987 | spin_lock(&gl->gl_spin); | |
988 | gl->gl_req_gh = NULL; | |
989 | gl->gl_req_bh = NULL; | |
990 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
991 | run_queue(gl); | |
992 | spin_unlock(&gl->gl_spin); | |
993 | ||
994 | gfs2_glock_put(gl); | |
995 | ||
996 | if (gh) { | |
997 | if (test_bit(HIF_DEALLOC, &gh->gh_iflags)) | |
998 | gfs2_holder_put(gh); | |
999 | else | |
1000 | complete(&gh->gh_wait); | |
1001 | } | |
1002 | } | |
1003 | ||
1004 | /** | |
1005 | * gfs2_glock_drop_th - call into the lock module to unlock a lock | |
1006 | * @gl: the glock | |
1007 | * | |
1008 | */ | |
1009 | ||
1010 | void gfs2_glock_drop_th(struct gfs2_glock *gl) | |
1011 | { | |
1012 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 1013 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
1014 | unsigned int ret; |
1015 | ||
1016 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
1017 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
1018 | gfs2_assert_warn(sdp, gl->gl_state != LM_ST_UNLOCKED); | |
1019 | ||
1020 | if (gl->gl_state == LM_ST_EXCLUSIVE) { | |
1021 | if (glops->go_sync) | |
1022 | glops->go_sync(gl, | |
1023 | DIO_METADATA | DIO_DATA | DIO_RELEASE); | |
1024 | } | |
1025 | ||
1026 | gfs2_glock_hold(gl); | |
1027 | gl->gl_req_bh = drop_bh; | |
1028 | ||
b3b94faa DT |
1029 | ret = gfs2_lm_unlock(sdp, gl->gl_lock, gl->gl_state); |
1030 | ||
1031 | if (gfs2_assert_withdraw(sdp, !(ret & LM_OUT_ERROR))) | |
1032 | return; | |
1033 | ||
1034 | if (!ret) | |
1035 | drop_bh(gl, ret); | |
1036 | else | |
1037 | gfs2_assert_warn(sdp, ret == LM_OUT_ASYNC); | |
1038 | } | |
1039 | ||
1040 | /** | |
1041 | * do_cancels - cancel requests for locks stuck waiting on an expire flag | |
1042 | * @gh: the LM_FLAG_PRIORITY holder waiting to acquire the lock | |
1043 | * | |
1044 | * Don't cancel GL_NOCANCEL requests. | |
1045 | */ | |
1046 | ||
1047 | static void do_cancels(struct gfs2_holder *gh) | |
1048 | { | |
1049 | struct gfs2_glock *gl = gh->gh_gl; | |
1050 | ||
1051 | spin_lock(&gl->gl_spin); | |
1052 | ||
1053 | while (gl->gl_req_gh != gh && | |
1054 | !test_bit(HIF_HOLDER, &gh->gh_iflags) && | |
1055 | !list_empty(&gh->gh_list)) { | |
1056 | if (gl->gl_req_bh && | |
1057 | !(gl->gl_req_gh && | |
1058 | (gl->gl_req_gh->gh_flags & GL_NOCANCEL))) { | |
1059 | spin_unlock(&gl->gl_spin); | |
1060 | gfs2_lm_cancel(gl->gl_sbd, gl->gl_lock); | |
1061 | msleep(100); | |
1062 | spin_lock(&gl->gl_spin); | |
1063 | } else { | |
1064 | spin_unlock(&gl->gl_spin); | |
1065 | msleep(100); | |
1066 | spin_lock(&gl->gl_spin); | |
1067 | } | |
1068 | } | |
1069 | ||
1070 | spin_unlock(&gl->gl_spin); | |
1071 | } | |
1072 | ||
1073 | /** | |
1074 | * glock_wait_internal - wait on a glock acquisition | |
1075 | * @gh: the glock holder | |
1076 | * | |
1077 | * Returns: 0 on success | |
1078 | */ | |
1079 | ||
1080 | static int glock_wait_internal(struct gfs2_holder *gh) | |
1081 | { | |
1082 | struct gfs2_glock *gl = gh->gh_gl; | |
1083 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 1084 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
1085 | |
1086 | if (test_bit(HIF_ABORTED, &gh->gh_iflags)) | |
1087 | return -EIO; | |
1088 | ||
1089 | if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { | |
1090 | spin_lock(&gl->gl_spin); | |
1091 | if (gl->gl_req_gh != gh && | |
1092 | !test_bit(HIF_HOLDER, &gh->gh_iflags) && | |
1093 | !list_empty(&gh->gh_list)) { | |
1094 | list_del_init(&gh->gh_list); | |
1095 | gh->gh_error = GLR_TRYFAILED; | |
b3b94faa DT |
1096 | run_queue(gl); |
1097 | spin_unlock(&gl->gl_spin); | |
1098 | return gh->gh_error; | |
1099 | } | |
1100 | spin_unlock(&gl->gl_spin); | |
1101 | } | |
1102 | ||
1103 | if (gh->gh_flags & LM_FLAG_PRIORITY) | |
1104 | do_cancels(gh); | |
1105 | ||
1106 | wait_for_completion(&gh->gh_wait); | |
1107 | ||
1108 | if (gh->gh_error) | |
1109 | return gh->gh_error; | |
1110 | ||
1111 | gfs2_assert_withdraw(sdp, test_bit(HIF_HOLDER, &gh->gh_iflags)); | |
1112 | gfs2_assert_withdraw(sdp, relaxed_state_ok(gl->gl_state, | |
1113 | gh->gh_state, | |
1114 | gh->gh_flags)); | |
1115 | ||
1116 | if (test_bit(HIF_FIRST, &gh->gh_iflags)) { | |
1117 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
1118 | ||
1119 | if (glops->go_lock) { | |
1120 | gh->gh_error = glops->go_lock(gh); | |
1121 | if (gh->gh_error) { | |
1122 | spin_lock(&gl->gl_spin); | |
1123 | list_del_init(&gh->gh_list); | |
b3b94faa DT |
1124 | spin_unlock(&gl->gl_spin); |
1125 | } | |
1126 | } | |
1127 | ||
1128 | spin_lock(&gl->gl_spin); | |
1129 | gl->gl_req_gh = NULL; | |
1130 | gl->gl_req_bh = NULL; | |
1131 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
b3b94faa DT |
1132 | run_queue(gl); |
1133 | spin_unlock(&gl->gl_spin); | |
1134 | } | |
1135 | ||
1136 | return gh->gh_error; | |
1137 | } | |
1138 | ||
1139 | static inline struct gfs2_holder * | |
1140 | find_holder_by_owner(struct list_head *head, struct task_struct *owner) | |
1141 | { | |
1142 | struct gfs2_holder *gh; | |
1143 | ||
1144 | list_for_each_entry(gh, head, gh_list) { | |
1145 | if (gh->gh_owner == owner) | |
1146 | return gh; | |
1147 | } | |
1148 | ||
1149 | return NULL; | |
1150 | } | |
1151 | ||
b3b94faa DT |
1152 | /** |
1153 | * add_to_queue - Add a holder to the wait queue (but look for recursion) | |
1154 | * @gh: the holder structure to add | |
1155 | * | |
1156 | */ | |
1157 | ||
1158 | static void add_to_queue(struct gfs2_holder *gh) | |
1159 | { | |
1160 | struct gfs2_glock *gl = gh->gh_gl; | |
1161 | struct gfs2_holder *existing; | |
1162 | ||
190562bd SW |
1163 | BUG_ON(!gh->gh_owner); |
1164 | ||
b3b94faa DT |
1165 | existing = find_holder_by_owner(&gl->gl_holders, gh->gh_owner); |
1166 | if (existing) { | |
5965b1f4 | 1167 | print_symbol(KERN_WARNING "original: %s\n", existing->gh_ip); |
86384605 AD |
1168 | printk(KERN_INFO "pid : %d\n", existing->gh_owner->pid); |
1169 | printk(KERN_INFO "lock type : %d lock state : %d\n", | |
1170 | existing->gh_gl->gl_name.ln_type, existing->gh_gl->gl_state); | |
5965b1f4 | 1171 | print_symbol(KERN_WARNING "new: %s\n", gh->gh_ip); |
86384605 AD |
1172 | printk(KERN_INFO "pid : %d\n", gh->gh_owner->pid); |
1173 | printk(KERN_INFO "lock type : %d lock state : %d\n", | |
1174 | gl->gl_name.ln_type, gl->gl_state); | |
5965b1f4 | 1175 | BUG(); |
b3b94faa DT |
1176 | } |
1177 | ||
1178 | existing = find_holder_by_owner(&gl->gl_waiters3, gh->gh_owner); | |
1179 | if (existing) { | |
5965b1f4 SW |
1180 | print_symbol(KERN_WARNING "original: %s\n", existing->gh_ip); |
1181 | print_symbol(KERN_WARNING "new: %s\n", gh->gh_ip); | |
1182 | BUG(); | |
b3b94faa DT |
1183 | } |
1184 | ||
b3b94faa DT |
1185 | if (gh->gh_flags & LM_FLAG_PRIORITY) |
1186 | list_add(&gh->gh_list, &gl->gl_waiters3); | |
1187 | else | |
1188 | list_add_tail(&gh->gh_list, &gl->gl_waiters3); | |
1189 | } | |
1190 | ||
1191 | /** | |
1192 | * gfs2_glock_nq - enqueue a struct gfs2_holder onto a glock (acquire a glock) | |
1193 | * @gh: the holder structure | |
1194 | * | |
1195 | * if (gh->gh_flags & GL_ASYNC), this never returns an error | |
1196 | * | |
1197 | * Returns: 0, GLR_TRYFAILED, or errno on failure | |
1198 | */ | |
1199 | ||
1200 | int gfs2_glock_nq(struct gfs2_holder *gh) | |
1201 | { | |
1202 | struct gfs2_glock *gl = gh->gh_gl; | |
1203 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1204 | int error = 0; | |
1205 | ||
320dd101 | 1206 | restart: |
b3b94faa DT |
1207 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) { |
1208 | set_bit(HIF_ABORTED, &gh->gh_iflags); | |
1209 | return -EIO; | |
1210 | } | |
1211 | ||
1212 | set_bit(HIF_PROMOTE, &gh->gh_iflags); | |
1213 | ||
1214 | spin_lock(&gl->gl_spin); | |
1215 | add_to_queue(gh); | |
1216 | run_queue(gl); | |
1217 | spin_unlock(&gl->gl_spin); | |
1218 | ||
1219 | if (!(gh->gh_flags & GL_ASYNC)) { | |
1220 | error = glock_wait_internal(gh); | |
1221 | if (error == GLR_CANCELED) { | |
190562bd | 1222 | msleep(100); |
b3b94faa DT |
1223 | goto restart; |
1224 | } | |
1225 | } | |
1226 | ||
1227 | clear_bit(GLF_PREFETCH, &gl->gl_flags); | |
1228 | ||
320dd101 SW |
1229 | if (error == GLR_TRYFAILED && (gh->gh_flags & GL_DUMP)) |
1230 | dump_glock(gl); | |
1231 | ||
b3b94faa DT |
1232 | return error; |
1233 | } | |
1234 | ||
1235 | /** | |
1236 | * gfs2_glock_poll - poll to see if an async request has been completed | |
1237 | * @gh: the holder | |
1238 | * | |
1239 | * Returns: 1 if the request is ready to be gfs2_glock_wait()ed on | |
1240 | */ | |
1241 | ||
1242 | int gfs2_glock_poll(struct gfs2_holder *gh) | |
1243 | { | |
1244 | struct gfs2_glock *gl = gh->gh_gl; | |
1245 | int ready = 0; | |
1246 | ||
1247 | spin_lock(&gl->gl_spin); | |
1248 | ||
1249 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
1250 | ready = 1; | |
1251 | else if (list_empty(&gh->gh_list)) { | |
1252 | if (gh->gh_error == GLR_CANCELED) { | |
1253 | spin_unlock(&gl->gl_spin); | |
190562bd | 1254 | msleep(100); |
b3b94faa DT |
1255 | if (gfs2_glock_nq(gh)) |
1256 | return 1; | |
1257 | return 0; | |
1258 | } else | |
1259 | ready = 1; | |
1260 | } | |
1261 | ||
1262 | spin_unlock(&gl->gl_spin); | |
1263 | ||
1264 | return ready; | |
1265 | } | |
1266 | ||
1267 | /** | |
1268 | * gfs2_glock_wait - wait for a lock acquisition that ended in a GLR_ASYNC | |
1269 | * @gh: the holder structure | |
1270 | * | |
1271 | * Returns: 0, GLR_TRYFAILED, or errno on failure | |
1272 | */ | |
1273 | ||
1274 | int gfs2_glock_wait(struct gfs2_holder *gh) | |
1275 | { | |
1276 | int error; | |
1277 | ||
1278 | error = glock_wait_internal(gh); | |
1279 | if (error == GLR_CANCELED) { | |
190562bd | 1280 | msleep(100); |
b3b94faa DT |
1281 | gh->gh_flags &= ~GL_ASYNC; |
1282 | error = gfs2_glock_nq(gh); | |
1283 | } | |
1284 | ||
1285 | return error; | |
1286 | } | |
1287 | ||
1288 | /** | |
1289 | * gfs2_glock_dq - dequeue a struct gfs2_holder from a glock (release a glock) | |
1290 | * @gh: the glock holder | |
1291 | * | |
1292 | */ | |
1293 | ||
1294 | void gfs2_glock_dq(struct gfs2_holder *gh) | |
1295 | { | |
1296 | struct gfs2_glock *gl = gh->gh_gl; | |
8fb4b536 | 1297 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa | 1298 | |
b3b94faa DT |
1299 | if (gh->gh_flags & GL_NOCACHE) |
1300 | handle_callback(gl, LM_ST_UNLOCKED); | |
1301 | ||
1302 | gfs2_glmutex_lock(gl); | |
1303 | ||
1304 | spin_lock(&gl->gl_spin); | |
1305 | list_del_init(&gh->gh_list); | |
1306 | ||
1307 | if (list_empty(&gl->gl_holders)) { | |
1308 | spin_unlock(&gl->gl_spin); | |
1309 | ||
1310 | if (glops->go_unlock) | |
1311 | glops->go_unlock(gh); | |
1312 | ||
b3b94faa DT |
1313 | gl->gl_stamp = jiffies; |
1314 | ||
1315 | spin_lock(&gl->gl_spin); | |
1316 | } | |
1317 | ||
1318 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
1319 | run_queue(gl); | |
1320 | spin_unlock(&gl->gl_spin); | |
1321 | } | |
1322 | ||
1323 | /** | |
1324 | * gfs2_glock_prefetch - Try to prefetch a glock | |
1325 | * @gl: the glock | |
1326 | * @state: the state to prefetch in | |
1327 | * @flags: flags passed to go_xmote_th() | |
1328 | * | |
1329 | */ | |
1330 | ||
08bc2dbc AB |
1331 | static void gfs2_glock_prefetch(struct gfs2_glock *gl, unsigned int state, |
1332 | int flags) | |
b3b94faa | 1333 | { |
8fb4b536 | 1334 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
1335 | |
1336 | spin_lock(&gl->gl_spin); | |
1337 | ||
1338 | if (test_bit(GLF_LOCK, &gl->gl_flags) || | |
1339 | !list_empty(&gl->gl_holders) || | |
1340 | !list_empty(&gl->gl_waiters1) || | |
1341 | !list_empty(&gl->gl_waiters2) || | |
1342 | !list_empty(&gl->gl_waiters3) || | |
1343 | relaxed_state_ok(gl->gl_state, state, flags)) { | |
1344 | spin_unlock(&gl->gl_spin); | |
1345 | return; | |
1346 | } | |
1347 | ||
1348 | set_bit(GLF_PREFETCH, &gl->gl_flags); | |
1349 | set_bit(GLF_LOCK, &gl->gl_flags); | |
1350 | spin_unlock(&gl->gl_spin); | |
1351 | ||
1352 | glops->go_xmote_th(gl, state, flags); | |
b3b94faa DT |
1353 | } |
1354 | ||
b3b94faa DT |
1355 | static void greedy_work(void *data) |
1356 | { | |
e7f5c01c | 1357 | struct greedy *gr = data; |
b3b94faa DT |
1358 | struct gfs2_holder *gh = &gr->gr_gh; |
1359 | struct gfs2_glock *gl = gh->gh_gl; | |
8fb4b536 | 1360 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
1361 | |
1362 | clear_bit(GLF_SKIP_WAITERS2, &gl->gl_flags); | |
1363 | ||
1364 | if (glops->go_greedy) | |
1365 | glops->go_greedy(gl); | |
1366 | ||
1367 | spin_lock(&gl->gl_spin); | |
1368 | ||
1369 | if (list_empty(&gl->gl_waiters2)) { | |
1370 | clear_bit(GLF_GREEDY, &gl->gl_flags); | |
1371 | spin_unlock(&gl->gl_spin); | |
1372 | gfs2_holder_uninit(gh); | |
1373 | kfree(gr); | |
1374 | } else { | |
1375 | gfs2_glock_hold(gl); | |
1376 | list_add_tail(&gh->gh_list, &gl->gl_waiters2); | |
1377 | run_queue(gl); | |
1378 | spin_unlock(&gl->gl_spin); | |
1379 | gfs2_glock_put(gl); | |
1380 | } | |
1381 | } | |
1382 | ||
1383 | /** | |
1384 | * gfs2_glock_be_greedy - | |
1385 | * @gl: | |
1386 | * @time: | |
1387 | * | |
1388 | * Returns: 0 if go_greedy will be called, 1 otherwise | |
1389 | */ | |
1390 | ||
1391 | int gfs2_glock_be_greedy(struct gfs2_glock *gl, unsigned int time) | |
1392 | { | |
1393 | struct greedy *gr; | |
1394 | struct gfs2_holder *gh; | |
1395 | ||
feaa7bba | 1396 | if (!time || gl->gl_sbd->sd_args.ar_localcaching || |
b3b94faa DT |
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, | |
8fb4b536 SW |
1442 | const struct gfs2_glock_operations *glops, |
1443 | unsigned int state, int flags, struct gfs2_holder *gh) | |
b3b94faa DT |
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, | |
8fb4b536 | 1640 | const struct gfs2_glock_operations *glops, |
b3b94faa DT |
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 | ||
b3b94faa DT |
1796 | /** |
1797 | * gfs2_iopen_go_callback - Try to kick the inode/vnode associated with an | |
1798 | * iopen glock from memory | |
1799 | * @io_gl: the iopen glock | |
1800 | * @state: the state into which the glock should be put | |
1801 | * | |
1802 | */ | |
1803 | ||
1804 | void gfs2_iopen_go_callback(struct gfs2_glock *io_gl, unsigned int state) | |
1805 | { | |
b3b94faa DT |
1806 | |
1807 | if (state != LM_ST_UNLOCKED) | |
1808 | return; | |
feaa7bba | 1809 | /* FIXME: remove this? */ |
b3b94faa DT |
1810 | } |
1811 | ||
1812 | /** | |
1813 | * demote_ok - Check to see if it's ok to unlock a glock | |
1814 | * @gl: the glock | |
1815 | * | |
1816 | * Returns: 1 if it's ok | |
1817 | */ | |
1818 | ||
1819 | static int demote_ok(struct gfs2_glock *gl) | |
1820 | { | |
1821 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 1822 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
1823 | int demote = 1; |
1824 | ||
1825 | if (test_bit(GLF_STICKY, &gl->gl_flags)) | |
1826 | demote = 0; | |
1827 | else if (test_bit(GLF_PREFETCH, &gl->gl_flags)) | |
1828 | demote = time_after_eq(jiffies, | |
1829 | gl->gl_stamp + | |
1830 | gfs2_tune_get(sdp, gt_prefetch_secs) * HZ); | |
1831 | else if (glops->go_demote_ok) | |
1832 | demote = glops->go_demote_ok(gl); | |
1833 | ||
1834 | return demote; | |
1835 | } | |
1836 | ||
1837 | /** | |
1838 | * gfs2_glock_schedule_for_reclaim - Add a glock to the reclaim list | |
1839 | * @gl: the glock | |
1840 | * | |
1841 | */ | |
1842 | ||
1843 | void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl) | |
1844 | { | |
1845 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1846 | ||
1847 | spin_lock(&sdp->sd_reclaim_lock); | |
1848 | if (list_empty(&gl->gl_reclaim)) { | |
1849 | gfs2_glock_hold(gl); | |
1850 | list_add(&gl->gl_reclaim, &sdp->sd_reclaim_list); | |
1851 | atomic_inc(&sdp->sd_reclaim_count); | |
1852 | } | |
1853 | spin_unlock(&sdp->sd_reclaim_lock); | |
1854 | ||
1855 | wake_up(&sdp->sd_reclaim_wq); | |
1856 | } | |
1857 | ||
1858 | /** | |
1859 | * gfs2_reclaim_glock - process the next glock on the filesystem's reclaim list | |
1860 | * @sdp: the filesystem | |
1861 | * | |
1862 | * Called from gfs2_glockd() glock reclaim daemon, or when promoting a | |
1863 | * different glock and we notice that there are a lot of glocks in the | |
1864 | * reclaim list. | |
1865 | * | |
1866 | */ | |
1867 | ||
1868 | void gfs2_reclaim_glock(struct gfs2_sbd *sdp) | |
1869 | { | |
1870 | struct gfs2_glock *gl; | |
1871 | ||
1872 | spin_lock(&sdp->sd_reclaim_lock); | |
1873 | if (list_empty(&sdp->sd_reclaim_list)) { | |
1874 | spin_unlock(&sdp->sd_reclaim_lock); | |
1875 | return; | |
1876 | } | |
1877 | gl = list_entry(sdp->sd_reclaim_list.next, | |
1878 | struct gfs2_glock, gl_reclaim); | |
1879 | list_del_init(&gl->gl_reclaim); | |
1880 | spin_unlock(&sdp->sd_reclaim_lock); | |
1881 | ||
1882 | atomic_dec(&sdp->sd_reclaim_count); | |
1883 | atomic_inc(&sdp->sd_reclaimed); | |
1884 | ||
1885 | if (gfs2_glmutex_trylock(gl)) { | |
b3b94faa DT |
1886 | if (queue_empty(gl, &gl->gl_holders) && |
1887 | gl->gl_state != LM_ST_UNLOCKED && | |
1888 | demote_ok(gl)) | |
1889 | handle_callback(gl, LM_ST_UNLOCKED); | |
1890 | gfs2_glmutex_unlock(gl); | |
1891 | } | |
1892 | ||
1893 | gfs2_glock_put(gl); | |
1894 | } | |
1895 | ||
1896 | /** | |
1897 | * examine_bucket - Call a function for glock in a hash bucket | |
1898 | * @examiner: the function | |
1899 | * @sdp: the filesystem | |
1900 | * @bucket: the bucket | |
1901 | * | |
1902 | * Returns: 1 if the bucket has entries | |
1903 | */ | |
1904 | ||
1905 | static int examine_bucket(glock_examiner examiner, struct gfs2_sbd *sdp, | |
1906 | struct gfs2_gl_hash_bucket *bucket) | |
1907 | { | |
1908 | struct glock_plug plug; | |
1909 | struct list_head *tmp; | |
1910 | struct gfs2_glock *gl; | |
1911 | int entries; | |
1912 | ||
1913 | /* Add "plug" to end of bucket list, work back up list from there */ | |
1914 | memset(&plug.gl_flags, 0, sizeof(unsigned long)); | |
1915 | set_bit(GLF_PLUG, &plug.gl_flags); | |
1916 | ||
1917 | write_lock(&bucket->hb_lock); | |
1918 | list_add(&plug.gl_list, &bucket->hb_list); | |
1919 | write_unlock(&bucket->hb_lock); | |
1920 | ||
1921 | for (;;) { | |
1922 | write_lock(&bucket->hb_lock); | |
1923 | ||
1924 | for (;;) { | |
1925 | tmp = plug.gl_list.next; | |
1926 | ||
1927 | if (tmp == &bucket->hb_list) { | |
1928 | list_del(&plug.gl_list); | |
1929 | entries = !list_empty(&bucket->hb_list); | |
1930 | write_unlock(&bucket->hb_lock); | |
1931 | return entries; | |
1932 | } | |
1933 | gl = list_entry(tmp, struct gfs2_glock, gl_list); | |
1934 | ||
1935 | /* Move plug up list */ | |
1936 | list_move(&plug.gl_list, &gl->gl_list); | |
1937 | ||
1938 | if (test_bit(GLF_PLUG, &gl->gl_flags)) | |
1939 | continue; | |
1940 | ||
1941 | /* examiner() must glock_put() */ | |
1942 | gfs2_glock_hold(gl); | |
1943 | ||
1944 | break; | |
1945 | } | |
1946 | ||
1947 | write_unlock(&bucket->hb_lock); | |
1948 | ||
1949 | examiner(gl); | |
1950 | } | |
1951 | } | |
1952 | ||
1953 | /** | |
1954 | * scan_glock - look at a glock and see if we can reclaim it | |
1955 | * @gl: the glock to look at | |
1956 | * | |
1957 | */ | |
1958 | ||
1959 | static void scan_glock(struct gfs2_glock *gl) | |
1960 | { | |
a2242db0 SW |
1961 | if (gl->gl_ops == &gfs2_inode_glops) |
1962 | goto out; | |
1963 | ||
b3b94faa | 1964 | if (gfs2_glmutex_trylock(gl)) { |
b3b94faa DT |
1965 | if (queue_empty(gl, &gl->gl_holders) && |
1966 | gl->gl_state != LM_ST_UNLOCKED && | |
1967 | demote_ok(gl)) | |
1968 | goto out_schedule; | |
b3b94faa DT |
1969 | gfs2_glmutex_unlock(gl); |
1970 | } | |
a2242db0 | 1971 | out: |
b3b94faa | 1972 | gfs2_glock_put(gl); |
b3b94faa DT |
1973 | return; |
1974 | ||
627add2d | 1975 | out_schedule: |
b3b94faa DT |
1976 | gfs2_glmutex_unlock(gl); |
1977 | gfs2_glock_schedule_for_reclaim(gl); | |
1978 | gfs2_glock_put(gl); | |
1979 | } | |
1980 | ||
1981 | /** | |
1982 | * gfs2_scand_internal - Look for glocks and inodes to toss from memory | |
1983 | * @sdp: the filesystem | |
1984 | * | |
1985 | */ | |
1986 | ||
1987 | void gfs2_scand_internal(struct gfs2_sbd *sdp) | |
1988 | { | |
1989 | unsigned int x; | |
1990 | ||
1991 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) { | |
1992 | examine_bucket(scan_glock, sdp, &sdp->sd_gl_hash[x]); | |
1993 | cond_resched(); | |
1994 | } | |
1995 | } | |
1996 | ||
1997 | /** | |
1998 | * clear_glock - look at a glock and see if we can free it from glock cache | |
1999 | * @gl: the glock to look at | |
2000 | * | |
2001 | */ | |
2002 | ||
2003 | static void clear_glock(struct gfs2_glock *gl) | |
2004 | { | |
2005 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
2006 | int released; | |
2007 | ||
2008 | spin_lock(&sdp->sd_reclaim_lock); | |
2009 | if (!list_empty(&gl->gl_reclaim)) { | |
2010 | list_del_init(&gl->gl_reclaim); | |
2011 | atomic_dec(&sdp->sd_reclaim_count); | |
190562bd | 2012 | spin_unlock(&sdp->sd_reclaim_lock); |
b3b94faa DT |
2013 | released = gfs2_glock_put(gl); |
2014 | gfs2_assert(sdp, !released); | |
190562bd SW |
2015 | } else { |
2016 | spin_unlock(&sdp->sd_reclaim_lock); | |
b3b94faa | 2017 | } |
b3b94faa DT |
2018 | |
2019 | if (gfs2_glmutex_trylock(gl)) { | |
b3b94faa DT |
2020 | if (queue_empty(gl, &gl->gl_holders) && |
2021 | gl->gl_state != LM_ST_UNLOCKED) | |
2022 | handle_callback(gl, LM_ST_UNLOCKED); | |
2023 | ||
2024 | gfs2_glmutex_unlock(gl); | |
2025 | } | |
2026 | ||
2027 | gfs2_glock_put(gl); | |
2028 | } | |
2029 | ||
2030 | /** | |
2031 | * gfs2_gl_hash_clear - Empty out the glock hash table | |
2032 | * @sdp: the filesystem | |
2033 | * @wait: wait until it's all gone | |
2034 | * | |
2035 | * Called when unmounting the filesystem, or when inter-node lock manager | |
2036 | * requests DROPLOCKS because it is running out of capacity. | |
2037 | */ | |
2038 | ||
2039 | void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait) | |
2040 | { | |
2041 | unsigned long t; | |
2042 | unsigned int x; | |
2043 | int cont; | |
2044 | ||
2045 | t = jiffies; | |
2046 | ||
2047 | for (;;) { | |
2048 | cont = 0; | |
2049 | ||
2050 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) | |
2051 | if (examine_bucket(clear_glock, sdp, | |
2052 | &sdp->sd_gl_hash[x])) | |
2053 | cont = 1; | |
2054 | ||
2055 | if (!wait || !cont) | |
2056 | break; | |
2057 | ||
2058 | if (time_after_eq(jiffies, | |
2059 | t + gfs2_tune_get(sdp, gt_stall_secs) * HZ)) { | |
2060 | fs_warn(sdp, "Unmount seems to be stalled. " | |
2061 | "Dumping lock state...\n"); | |
2062 | gfs2_dump_lockstate(sdp); | |
2063 | t = jiffies; | |
2064 | } | |
2065 | ||
b3b94faa | 2066 | invalidate_inodes(sdp->sd_vfs); |
fd88de56 | 2067 | msleep(10); |
b3b94faa DT |
2068 | } |
2069 | } | |
2070 | ||
2071 | /* | |
2072 | * Diagnostic routines to help debug distributed deadlock | |
2073 | */ | |
2074 | ||
2075 | /** | |
2076 | * dump_holder - print information about a glock holder | |
2077 | * @str: a string naming the type of holder | |
2078 | * @gh: the glock holder | |
2079 | * | |
2080 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
2081 | */ | |
2082 | ||
2083 | static int dump_holder(char *str, struct gfs2_holder *gh) | |
2084 | { | |
2085 | unsigned int x; | |
2086 | int error = -ENOBUFS; | |
2087 | ||
d92a8d48 SW |
2088 | printk(KERN_INFO " %s\n", str); |
2089 | printk(KERN_INFO " owner = %ld\n", | |
b3b94faa | 2090 | (gh->gh_owner) ? (long)gh->gh_owner->pid : -1); |
d92a8d48 SW |
2091 | printk(KERN_INFO " gh_state = %u\n", gh->gh_state); |
2092 | printk(KERN_INFO " gh_flags ="); | |
b3b94faa DT |
2093 | for (x = 0; x < 32; x++) |
2094 | if (gh->gh_flags & (1 << x)) | |
2095 | printk(" %u", x); | |
2096 | printk(" \n"); | |
d92a8d48 SW |
2097 | printk(KERN_INFO " error = %d\n", gh->gh_error); |
2098 | printk(KERN_INFO " gh_iflags ="); | |
b3b94faa DT |
2099 | for (x = 0; x < 32; x++) |
2100 | if (test_bit(x, &gh->gh_iflags)) | |
2101 | printk(" %u", x); | |
2102 | printk(" \n"); | |
d0dc80db | 2103 | print_symbol(KERN_INFO " initialized at: %s\n", gh->gh_ip); |
b3b94faa DT |
2104 | |
2105 | error = 0; | |
2106 | ||
2107 | return error; | |
2108 | } | |
2109 | ||
2110 | /** | |
2111 | * dump_inode - print information about an inode | |
2112 | * @ip: the inode | |
2113 | * | |
2114 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
2115 | */ | |
2116 | ||
2117 | static int dump_inode(struct gfs2_inode *ip) | |
2118 | { | |
2119 | unsigned int x; | |
2120 | int error = -ENOBUFS; | |
2121 | ||
d92a8d48 SW |
2122 | printk(KERN_INFO " Inode:\n"); |
2123 | printk(KERN_INFO " num = %llu %llu\n", | |
382066da SW |
2124 | (unsigned long long)ip->i_num.no_formal_ino, |
2125 | (unsigned long long)ip->i_num.no_addr); | |
d92a8d48 | 2126 | printk(KERN_INFO " type = %u\n", IF2DT(ip->i_di.di_mode)); |
d92a8d48 | 2127 | printk(KERN_INFO " i_flags ="); |
b3b94faa DT |
2128 | for (x = 0; x < 32; x++) |
2129 | if (test_bit(x, &ip->i_flags)) | |
2130 | printk(" %u", x); | |
2131 | printk(" \n"); | |
b3b94faa DT |
2132 | |
2133 | error = 0; | |
2134 | ||
2135 | return error; | |
2136 | } | |
2137 | ||
2138 | /** | |
2139 | * dump_glock - print information about a glock | |
2140 | * @gl: the glock | |
2141 | * @count: where we are in the buffer | |
2142 | * | |
2143 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
2144 | */ | |
2145 | ||
2146 | static int dump_glock(struct gfs2_glock *gl) | |
2147 | { | |
2148 | struct gfs2_holder *gh; | |
2149 | unsigned int x; | |
2150 | int error = -ENOBUFS; | |
2151 | ||
2152 | spin_lock(&gl->gl_spin); | |
2153 | ||
88721877 RC |
2154 | printk(KERN_INFO "Glock 0x%p (%u, %llu)\n", |
2155 | gl, | |
2156 | gl->gl_name.ln_type, | |
382066da | 2157 | (unsigned long long)gl->gl_name.ln_number); |
d92a8d48 | 2158 | printk(KERN_INFO " gl_flags ="); |
b3b94faa DT |
2159 | for (x = 0; x < 32; x++) |
2160 | if (test_bit(x, &gl->gl_flags)) | |
2161 | printk(" %u", x); | |
2162 | printk(" \n"); | |
d92a8d48 SW |
2163 | printk(KERN_INFO " gl_ref = %d\n", atomic_read(&gl->gl_ref.refcount)); |
2164 | printk(KERN_INFO " gl_state = %u\n", gl->gl_state); | |
320dd101 SW |
2165 | printk(KERN_INFO " gl_owner = %s\n", gl->gl_owner->comm); |
2166 | print_symbol(KERN_INFO " gl_ip = %s\n", gl->gl_ip); | |
d92a8d48 SW |
2167 | printk(KERN_INFO " req_gh = %s\n", (gl->gl_req_gh) ? "yes" : "no"); |
2168 | printk(KERN_INFO " req_bh = %s\n", (gl->gl_req_bh) ? "yes" : "no"); | |
2169 | printk(KERN_INFO " lvb_count = %d\n", atomic_read(&gl->gl_lvb_count)); | |
2170 | printk(KERN_INFO " object = %s\n", (gl->gl_object) ? "yes" : "no"); | |
2171 | printk(KERN_INFO " le = %s\n", | |
b3b94faa | 2172 | (list_empty(&gl->gl_le.le_list)) ? "no" : "yes"); |
d92a8d48 | 2173 | printk(KERN_INFO " reclaim = %s\n", |
b3b94faa DT |
2174 | (list_empty(&gl->gl_reclaim)) ? "no" : "yes"); |
2175 | if (gl->gl_aspace) | |
88721877 RC |
2176 | printk(KERN_INFO " aspace = 0x%p nrpages = %lu\n", |
2177 | gl->gl_aspace, | |
2178 | gl->gl_aspace->i_mapping->nrpages); | |
b3b94faa | 2179 | else |
d92a8d48 SW |
2180 | printk(KERN_INFO " aspace = no\n"); |
2181 | printk(KERN_INFO " ail = %d\n", atomic_read(&gl->gl_ail_count)); | |
b3b94faa DT |
2182 | if (gl->gl_req_gh) { |
2183 | error = dump_holder("Request", gl->gl_req_gh); | |
2184 | if (error) | |
2185 | goto out; | |
2186 | } | |
2187 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
2188 | error = dump_holder("Holder", gh); | |
2189 | if (error) | |
2190 | goto out; | |
2191 | } | |
2192 | list_for_each_entry(gh, &gl->gl_waiters1, gh_list) { | |
2193 | error = dump_holder("Waiter1", gh); | |
2194 | if (error) | |
2195 | goto out; | |
2196 | } | |
2197 | list_for_each_entry(gh, &gl->gl_waiters2, gh_list) { | |
2198 | error = dump_holder("Waiter2", gh); | |
2199 | if (error) | |
2200 | goto out; | |
2201 | } | |
2202 | list_for_each_entry(gh, &gl->gl_waiters3, gh_list) { | |
2203 | error = dump_holder("Waiter3", gh); | |
2204 | if (error) | |
2205 | goto out; | |
2206 | } | |
5c676f6d | 2207 | if (gl->gl_ops == &gfs2_inode_glops && gl->gl_object) { |
b3b94faa DT |
2208 | if (!test_bit(GLF_LOCK, &gl->gl_flags) && |
2209 | list_empty(&gl->gl_holders)) { | |
5c676f6d | 2210 | error = dump_inode(gl->gl_object); |
b3b94faa DT |
2211 | if (error) |
2212 | goto out; | |
2213 | } else { | |
2214 | error = -ENOBUFS; | |
d92a8d48 | 2215 | printk(KERN_INFO " Inode: busy\n"); |
b3b94faa DT |
2216 | } |
2217 | } | |
2218 | ||
2219 | error = 0; | |
2220 | ||
2221 | out: | |
2222 | spin_unlock(&gl->gl_spin); | |
2223 | ||
2224 | return error; | |
2225 | } | |
2226 | ||
2227 | /** | |
2228 | * gfs2_dump_lockstate - print out the current lockstate | |
2229 | * @sdp: the filesystem | |
2230 | * @ub: the buffer to copy the information into | |
2231 | * | |
2232 | * If @ub is NULL, dump the lockstate to the console. | |
2233 | * | |
2234 | */ | |
2235 | ||
08bc2dbc | 2236 | static int gfs2_dump_lockstate(struct gfs2_sbd *sdp) |
b3b94faa DT |
2237 | { |
2238 | struct gfs2_gl_hash_bucket *bucket; | |
2239 | struct gfs2_glock *gl; | |
2240 | unsigned int x; | |
2241 | int error = 0; | |
2242 | ||
2243 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) { | |
2244 | bucket = &sdp->sd_gl_hash[x]; | |
2245 | ||
2246 | read_lock(&bucket->hb_lock); | |
2247 | ||
2248 | list_for_each_entry(gl, &bucket->hb_list, gl_list) { | |
2249 | if (test_bit(GLF_PLUG, &gl->gl_flags)) | |
2250 | continue; | |
2251 | ||
2252 | error = dump_glock(gl); | |
2253 | if (error) | |
2254 | break; | |
2255 | } | |
2256 | ||
2257 | read_unlock(&bucket->hb_lock); | |
2258 | ||
2259 | if (error) | |
2260 | break; | |
2261 | } | |
2262 | ||
2263 | ||
2264 | return error; | |
2265 | } | |
2266 |