Commit | Line | Data |
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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 | |
e9fc2aa0 | 7 | * of the GNU General Public License version 2. |
b3b94faa DT |
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 | ||
37b2fa6a SW |
47 | struct gfs2_gl_hash_bucket { |
48 | struct list_head hb_list; | |
49 | }; | |
50 | ||
b3b94faa DT |
51 | typedef void (*glock_examiner) (struct gfs2_glock * gl); |
52 | ||
08bc2dbc | 53 | static int gfs2_dump_lockstate(struct gfs2_sbd *sdp); |
320dd101 | 54 | static int dump_glock(struct gfs2_glock *gl); |
08bc2dbc | 55 | |
087efdd3 SW |
56 | #define GFS2_GL_HASH_SHIFT 13 |
57 | #define GFS2_GL_HASH_SIZE (1 << GFS2_GL_HASH_SHIFT) | |
58 | #define GFS2_GL_HASH_MASK (GFS2_GL_HASH_SIZE - 1) | |
59 | ||
85d1da67 | 60 | static struct gfs2_gl_hash_bucket gl_hash_table[GFS2_GL_HASH_SIZE]; |
087efdd3 SW |
61 | |
62 | /* | |
63 | * Despite what you might think, the numbers below are not arbitrary :-) | |
64 | * They are taken from the ipv4 routing hash code, which is well tested | |
65 | * and thus should be nearly optimal. Later on we might tweek the numbers | |
66 | * but for now this should be fine. | |
67 | * | |
68 | * The reason for putting the locks in a separate array from the list heads | |
69 | * is that we can have fewer locks than list heads and save memory. We use | |
70 | * the same hash function for both, but with a different hash mask. | |
71 | */ | |
72 | #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) || \ | |
73 | defined(CONFIG_PROVE_LOCKING) | |
74 | ||
75 | #ifdef CONFIG_LOCKDEP | |
76 | # define GL_HASH_LOCK_SZ 256 | |
77 | #else | |
78 | # if NR_CPUS >= 32 | |
79 | # define GL_HASH_LOCK_SZ 4096 | |
80 | # elif NR_CPUS >= 16 | |
81 | # define GL_HASH_LOCK_SZ 2048 | |
82 | # elif NR_CPUS >= 8 | |
83 | # define GL_HASH_LOCK_SZ 1024 | |
84 | # elif NR_CPUS >= 4 | |
85 | # define GL_HASH_LOCK_SZ 512 | |
86 | # else | |
87 | # define GL_HASH_LOCK_SZ 256 | |
88 | # endif | |
89 | #endif | |
90 | ||
91 | /* We never want more locks than chains */ | |
92 | #if GFS2_GL_HASH_SIZE < GL_HASH_LOCK_SZ | |
93 | # undef GL_HASH_LOCK_SZ | |
94 | # define GL_HASH_LOCK_SZ GFS2_GL_HASH_SIZE | |
95 | #endif | |
96 | ||
97 | static rwlock_t gl_hash_locks[GL_HASH_LOCK_SZ]; | |
98 | ||
99 | static inline rwlock_t *gl_lock_addr(unsigned int x) | |
100 | { | |
101 | return &gl_hash_locks[(x) & (GL_HASH_LOCK_SZ-1)]; | |
102 | } | |
103 | #else /* not SMP, so no spinlocks required */ | |
104 | static inline rwlock_t *gl_lock_addr(x) | |
105 | { | |
106 | return NULL; | |
107 | } | |
108 | #endif | |
85d1da67 | 109 | |
b3b94faa DT |
110 | /** |
111 | * relaxed_state_ok - is a requested lock compatible with the current lock mode? | |
112 | * @actual: the current state of the lock | |
113 | * @requested: the lock state that was requested by the caller | |
114 | * @flags: the modifier flags passed in by the caller | |
115 | * | |
116 | * Returns: 1 if the locks are compatible, 0 otherwise | |
117 | */ | |
118 | ||
119 | static inline int relaxed_state_ok(unsigned int actual, unsigned requested, | |
120 | int flags) | |
121 | { | |
122 | if (actual == requested) | |
123 | return 1; | |
124 | ||
125 | if (flags & GL_EXACT) | |
126 | return 0; | |
127 | ||
128 | if (actual == LM_ST_EXCLUSIVE && requested == LM_ST_SHARED) | |
129 | return 1; | |
130 | ||
131 | if (actual != LM_ST_UNLOCKED && (flags & LM_FLAG_ANY)) | |
132 | return 1; | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
137 | /** | |
138 | * gl_hash() - Turn glock number into hash bucket number | |
139 | * @lock: The glock number | |
140 | * | |
141 | * Returns: The number of the corresponding hash bucket | |
142 | */ | |
143 | ||
b8547856 SW |
144 | static unsigned int gl_hash(const struct gfs2_sbd *sdp, |
145 | const struct lm_lockname *name) | |
b3b94faa DT |
146 | { |
147 | unsigned int h; | |
148 | ||
cd915493 | 149 | h = jhash(&name->ln_number, sizeof(u64), 0); |
b3b94faa | 150 | h = jhash(&name->ln_type, sizeof(unsigned int), h); |
b8547856 | 151 | h = jhash(&sdp, sizeof(struct gfs2_sbd *), h); |
b3b94faa DT |
152 | h &= GFS2_GL_HASH_MASK; |
153 | ||
154 | return h; | |
155 | } | |
156 | ||
157 | /** | |
158 | * glock_free() - Perform a few checks and then release struct gfs2_glock | |
159 | * @gl: The glock to release | |
160 | * | |
161 | * Also calls lock module to release its internal structure for this glock. | |
162 | * | |
163 | */ | |
164 | ||
165 | static void glock_free(struct gfs2_glock *gl) | |
166 | { | |
167 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
168 | struct inode *aspace = gl->gl_aspace; | |
169 | ||
170 | gfs2_lm_put_lock(sdp, gl->gl_lock); | |
171 | ||
172 | if (aspace) | |
173 | gfs2_aspace_put(aspace); | |
174 | ||
175 | kmem_cache_free(gfs2_glock_cachep, gl); | |
b3b94faa DT |
176 | } |
177 | ||
178 | /** | |
179 | * gfs2_glock_hold() - increment reference count on glock | |
180 | * @gl: The glock to hold | |
181 | * | |
182 | */ | |
183 | ||
184 | void gfs2_glock_hold(struct gfs2_glock *gl) | |
185 | { | |
186 | kref_get(&gl->gl_ref); | |
187 | } | |
188 | ||
189 | /* All work is done after the return from kref_put() so we | |
190 | can release the write_lock before the free. */ | |
191 | ||
192 | static void kill_glock(struct kref *kref) | |
193 | { | |
194 | struct gfs2_glock *gl = container_of(kref, struct gfs2_glock, gl_ref); | |
195 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
196 | ||
197 | gfs2_assert(sdp, gl->gl_state == LM_ST_UNLOCKED); | |
198 | gfs2_assert(sdp, list_empty(&gl->gl_reclaim)); | |
199 | gfs2_assert(sdp, list_empty(&gl->gl_holders)); | |
200 | gfs2_assert(sdp, list_empty(&gl->gl_waiters1)); | |
201 | gfs2_assert(sdp, list_empty(&gl->gl_waiters2)); | |
202 | gfs2_assert(sdp, list_empty(&gl->gl_waiters3)); | |
203 | } | |
204 | ||
205 | /** | |
206 | * gfs2_glock_put() - Decrement reference count on glock | |
207 | * @gl: The glock to put | |
208 | * | |
209 | */ | |
210 | ||
211 | int gfs2_glock_put(struct gfs2_glock *gl) | |
212 | { | |
b3b94faa DT |
213 | int rv = 0; |
214 | ||
087efdd3 | 215 | write_lock(gl_lock_addr(gl->gl_hash)); |
b3b94faa | 216 | if (kref_put(&gl->gl_ref, kill_glock)) { |
37b2fa6a | 217 | list_del_init(&gl_hash_table[gl->gl_hash].hb_list); |
087efdd3 | 218 | write_unlock(gl_lock_addr(gl->gl_hash)); |
190562bd | 219 | BUG_ON(spin_is_locked(&gl->gl_spin)); |
b3b94faa DT |
220 | glock_free(gl); |
221 | rv = 1; | |
222 | goto out; | |
223 | } | |
087efdd3 | 224 | write_unlock(gl_lock_addr(gl->gl_hash)); |
a2242db0 | 225 | out: |
b3b94faa DT |
226 | return rv; |
227 | } | |
228 | ||
229 | /** | |
230 | * queue_empty - check to see if a glock's queue is empty | |
231 | * @gl: the glock | |
232 | * @head: the head of the queue to check | |
233 | * | |
234 | * This function protects the list in the event that a process already | |
235 | * has a holder on the list and is adding a second holder for itself. | |
236 | * The glmutex lock is what generally prevents processes from working | |
237 | * on the same glock at once, but the special case of adding a second | |
238 | * holder for yourself ("recursive" locking) doesn't involve locking | |
239 | * glmutex, making the spin lock necessary. | |
240 | * | |
241 | * Returns: 1 if the queue is empty | |
242 | */ | |
243 | ||
244 | static inline int queue_empty(struct gfs2_glock *gl, struct list_head *head) | |
245 | { | |
246 | int empty; | |
247 | spin_lock(&gl->gl_spin); | |
248 | empty = list_empty(head); | |
249 | spin_unlock(&gl->gl_spin); | |
250 | return empty; | |
251 | } | |
252 | ||
253 | /** | |
254 | * search_bucket() - Find struct gfs2_glock by lock number | |
255 | * @bucket: the bucket to search | |
256 | * @name: The lock name | |
257 | * | |
258 | * Returns: NULL, or the struct gfs2_glock with the requested number | |
259 | */ | |
260 | ||
37b2fa6a | 261 | static struct gfs2_glock *search_bucket(unsigned int hash, |
899be4d3 | 262 | const struct gfs2_sbd *sdp, |
d6a53727 | 263 | const struct lm_lockname *name) |
b3b94faa DT |
264 | { |
265 | struct gfs2_glock *gl; | |
266 | ||
37b2fa6a | 267 | list_for_each_entry(gl, &gl_hash_table[hash].hb_list, gl_list) { |
b3b94faa DT |
268 | if (test_bit(GLF_PLUG, &gl->gl_flags)) |
269 | continue; | |
270 | if (!lm_name_equal(&gl->gl_name, name)) | |
271 | continue; | |
899be4d3 SW |
272 | if (gl->gl_sbd != sdp) |
273 | continue; | |
b3b94faa DT |
274 | |
275 | kref_get(&gl->gl_ref); | |
276 | ||
277 | return gl; | |
278 | } | |
279 | ||
280 | return NULL; | |
281 | } | |
282 | ||
283 | /** | |
284 | * gfs2_glock_find() - Find glock by lock number | |
285 | * @sdp: The GFS2 superblock | |
286 | * @name: The lock name | |
287 | * | |
288 | * Returns: NULL, or the struct gfs2_glock with the requested number | |
289 | */ | |
290 | ||
85d1da67 | 291 | static struct gfs2_glock *gfs2_glock_find(const struct gfs2_sbd *sdp, |
d6a53727 | 292 | const struct lm_lockname *name) |
b3b94faa | 293 | { |
37b2fa6a | 294 | unsigned int hash = gl_hash(sdp, name); |
b3b94faa DT |
295 | struct gfs2_glock *gl; |
296 | ||
087efdd3 | 297 | read_lock(gl_lock_addr(hash)); |
37b2fa6a | 298 | gl = search_bucket(hash, sdp, name); |
087efdd3 | 299 | read_unlock(gl_lock_addr(hash)); |
b3b94faa DT |
300 | |
301 | return gl; | |
302 | } | |
303 | ||
304 | /** | |
305 | * gfs2_glock_get() - Get a glock, or create one if one doesn't exist | |
306 | * @sdp: The GFS2 superblock | |
307 | * @number: the lock number | |
308 | * @glops: The glock_operations to use | |
309 | * @create: If 0, don't create the glock if it doesn't exist | |
310 | * @glp: the glock is returned here | |
311 | * | |
312 | * This does not lock a glock, just finds/creates structures for one. | |
313 | * | |
314 | * Returns: errno | |
315 | */ | |
316 | ||
cd915493 | 317 | int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 | 318 | const struct gfs2_glock_operations *glops, int create, |
b3b94faa DT |
319 | struct gfs2_glock **glp) |
320 | { | |
37b2fa6a | 321 | struct lm_lockname name = { .ln_number = number, .ln_type = glops->go_type }; |
b3b94faa | 322 | struct gfs2_glock *gl, *tmp; |
37b2fa6a | 323 | unsigned int hash = gl_hash(sdp, &name); |
b3b94faa DT |
324 | int error; |
325 | ||
087efdd3 | 326 | read_lock(gl_lock_addr(hash)); |
37b2fa6a | 327 | gl = search_bucket(hash, sdp, &name); |
087efdd3 | 328 | read_unlock(gl_lock_addr(hash)); |
b3b94faa DT |
329 | |
330 | if (gl || !create) { | |
331 | *glp = gl; | |
332 | return 0; | |
333 | } | |
334 | ||
335 | gl = kmem_cache_alloc(gfs2_glock_cachep, GFP_KERNEL); | |
336 | if (!gl) | |
337 | return -ENOMEM; | |
338 | ||
ec45d9f5 | 339 | gl->gl_flags = 0; |
b3b94faa DT |
340 | gl->gl_name = name; |
341 | kref_init(&gl->gl_ref); | |
b3b94faa | 342 | gl->gl_state = LM_ST_UNLOCKED; |
37b2fa6a | 343 | gl->gl_hash = hash; |
320dd101 SW |
344 | gl->gl_owner = NULL; |
345 | gl->gl_ip = 0; | |
b3b94faa | 346 | gl->gl_ops = glops; |
ec45d9f5 SW |
347 | gl->gl_req_gh = NULL; |
348 | gl->gl_req_bh = NULL; | |
349 | gl->gl_vn = 0; | |
350 | gl->gl_stamp = jiffies; | |
351 | gl->gl_object = NULL; | |
b3b94faa | 352 | gl->gl_sbd = sdp; |
ec45d9f5 | 353 | gl->gl_aspace = NULL; |
b3b94faa | 354 | lops_init_le(&gl->gl_le, &gfs2_glock_lops); |
b3b94faa DT |
355 | |
356 | /* If this glock protects actual on-disk data or metadata blocks, | |
357 | create a VFS inode to manage the pages/buffers holding them. */ | |
50299965 | 358 | if (glops == &gfs2_inode_glops || glops == &gfs2_rgrp_glops) { |
b3b94faa DT |
359 | gl->gl_aspace = gfs2_aspace_get(sdp); |
360 | if (!gl->gl_aspace) { | |
361 | error = -ENOMEM; | |
362 | goto fail; | |
363 | } | |
364 | } | |
365 | ||
366 | error = gfs2_lm_get_lock(sdp, &name, &gl->gl_lock); | |
367 | if (error) | |
368 | goto fail_aspace; | |
369 | ||
087efdd3 | 370 | write_lock(gl_lock_addr(hash)); |
37b2fa6a | 371 | tmp = search_bucket(hash, sdp, &name); |
b3b94faa | 372 | if (tmp) { |
087efdd3 | 373 | write_unlock(gl_lock_addr(hash)); |
b3b94faa DT |
374 | glock_free(gl); |
375 | gl = tmp; | |
376 | } else { | |
37b2fa6a | 377 | list_add_tail(&gl->gl_list, &gl_hash_table[hash].hb_list); |
087efdd3 | 378 | write_unlock(gl_lock_addr(hash)); |
b3b94faa DT |
379 | } |
380 | ||
381 | *glp = gl; | |
382 | ||
383 | return 0; | |
384 | ||
ec45d9f5 | 385 | fail_aspace: |
b3b94faa DT |
386 | if (gl->gl_aspace) |
387 | gfs2_aspace_put(gl->gl_aspace); | |
ec45d9f5 | 388 | fail: |
b3b94faa | 389 | kmem_cache_free(gfs2_glock_cachep, gl); |
b3b94faa DT |
390 | return error; |
391 | } | |
392 | ||
393 | /** | |
394 | * gfs2_holder_init - initialize a struct gfs2_holder in the default way | |
395 | * @gl: the glock | |
396 | * @state: the state we're requesting | |
397 | * @flags: the modifier flags | |
398 | * @gh: the holder structure | |
399 | * | |
400 | */ | |
401 | ||
190562bd | 402 | void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags, |
b3b94faa DT |
403 | struct gfs2_holder *gh) |
404 | { | |
405 | INIT_LIST_HEAD(&gh->gh_list); | |
406 | gh->gh_gl = gl; | |
d0dc80db | 407 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
190562bd | 408 | gh->gh_owner = current; |
b3b94faa DT |
409 | gh->gh_state = state; |
410 | gh->gh_flags = flags; | |
411 | gh->gh_error = 0; | |
412 | gh->gh_iflags = 0; | |
413 | init_completion(&gh->gh_wait); | |
414 | ||
415 | if (gh->gh_state == LM_ST_EXCLUSIVE) | |
416 | gh->gh_flags |= GL_LOCAL_EXCL; | |
417 | ||
418 | gfs2_glock_hold(gl); | |
419 | } | |
420 | ||
421 | /** | |
422 | * gfs2_holder_reinit - reinitialize a struct gfs2_holder so we can requeue it | |
423 | * @state: the state we're requesting | |
424 | * @flags: the modifier flags | |
425 | * @gh: the holder structure | |
426 | * | |
427 | * Don't mess with the glock. | |
428 | * | |
429 | */ | |
430 | ||
190562bd | 431 | void gfs2_holder_reinit(unsigned int state, unsigned flags, struct gfs2_holder *gh) |
b3b94faa DT |
432 | { |
433 | gh->gh_state = state; | |
579b78a4 | 434 | gh->gh_flags = flags; |
b3b94faa DT |
435 | if (gh->gh_state == LM_ST_EXCLUSIVE) |
436 | gh->gh_flags |= GL_LOCAL_EXCL; | |
437 | ||
438 | gh->gh_iflags &= 1 << HIF_ALLOCED; | |
d0dc80db | 439 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
b3b94faa DT |
440 | } |
441 | ||
442 | /** | |
443 | * gfs2_holder_uninit - uninitialize a holder structure (drop glock reference) | |
444 | * @gh: the holder structure | |
445 | * | |
446 | */ | |
447 | ||
448 | void gfs2_holder_uninit(struct gfs2_holder *gh) | |
449 | { | |
450 | gfs2_glock_put(gh->gh_gl); | |
451 | gh->gh_gl = NULL; | |
d0dc80db | 452 | gh->gh_ip = 0; |
b3b94faa DT |
453 | } |
454 | ||
455 | /** | |
456 | * gfs2_holder_get - get a struct gfs2_holder structure | |
457 | * @gl: the glock | |
458 | * @state: the state we're requesting | |
459 | * @flags: the modifier flags | |
af18ddb8 | 460 | * @gfp_flags: |
b3b94faa DT |
461 | * |
462 | * Figure out how big an impact this function has. Either: | |
463 | * 1) Replace it with a cache of structures hanging off the struct gfs2_sbd | |
464 | * 2) Leave it like it is | |
465 | * | |
466 | * Returns: the holder structure, NULL on ENOMEM | |
467 | */ | |
468 | ||
08bc2dbc AB |
469 | static struct gfs2_holder *gfs2_holder_get(struct gfs2_glock *gl, |
470 | unsigned int state, | |
471 | int flags, gfp_t gfp_flags) | |
b3b94faa DT |
472 | { |
473 | struct gfs2_holder *gh; | |
474 | ||
475 | gh = kmalloc(sizeof(struct gfs2_holder), gfp_flags); | |
476 | if (!gh) | |
477 | return NULL; | |
478 | ||
479 | gfs2_holder_init(gl, state, flags, gh); | |
480 | set_bit(HIF_ALLOCED, &gh->gh_iflags); | |
d0dc80db | 481 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
b3b94faa DT |
482 | return gh; |
483 | } | |
484 | ||
485 | /** | |
486 | * gfs2_holder_put - get rid of a struct gfs2_holder structure | |
487 | * @gh: the holder structure | |
488 | * | |
489 | */ | |
490 | ||
08bc2dbc | 491 | static void gfs2_holder_put(struct gfs2_holder *gh) |
b3b94faa DT |
492 | { |
493 | gfs2_holder_uninit(gh); | |
494 | kfree(gh); | |
495 | } | |
496 | ||
b3b94faa DT |
497 | /** |
498 | * rq_mutex - process a mutex request in the queue | |
499 | * @gh: the glock holder | |
500 | * | |
501 | * Returns: 1 if the queue is blocked | |
502 | */ | |
503 | ||
504 | static int rq_mutex(struct gfs2_holder *gh) | |
505 | { | |
506 | struct gfs2_glock *gl = gh->gh_gl; | |
507 | ||
508 | list_del_init(&gh->gh_list); | |
509 | /* gh->gh_error never examined. */ | |
510 | set_bit(GLF_LOCK, &gl->gl_flags); | |
511 | complete(&gh->gh_wait); | |
512 | ||
513 | return 1; | |
514 | } | |
515 | ||
516 | /** | |
517 | * rq_promote - process a promote request in the queue | |
518 | * @gh: the glock holder | |
519 | * | |
520 | * Acquire a new inter-node lock, or change a lock state to more restrictive. | |
521 | * | |
522 | * Returns: 1 if the queue is blocked | |
523 | */ | |
524 | ||
525 | static int rq_promote(struct gfs2_holder *gh) | |
526 | { | |
527 | struct gfs2_glock *gl = gh->gh_gl; | |
528 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 529 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
530 | |
531 | if (!relaxed_state_ok(gl->gl_state, gh->gh_state, gh->gh_flags)) { | |
532 | if (list_empty(&gl->gl_holders)) { | |
533 | gl->gl_req_gh = gh; | |
534 | set_bit(GLF_LOCK, &gl->gl_flags); | |
535 | spin_unlock(&gl->gl_spin); | |
536 | ||
537 | if (atomic_read(&sdp->sd_reclaim_count) > | |
538 | gfs2_tune_get(sdp, gt_reclaim_limit) && | |
539 | !(gh->gh_flags & LM_FLAG_PRIORITY)) { | |
540 | gfs2_reclaim_glock(sdp); | |
541 | gfs2_reclaim_glock(sdp); | |
542 | } | |
543 | ||
ec45d9f5 | 544 | glops->go_xmote_th(gl, gh->gh_state, gh->gh_flags); |
b3b94faa DT |
545 | spin_lock(&gl->gl_spin); |
546 | } | |
547 | return 1; | |
548 | } | |
549 | ||
550 | if (list_empty(&gl->gl_holders)) { | |
551 | set_bit(HIF_FIRST, &gh->gh_iflags); | |
552 | set_bit(GLF_LOCK, &gl->gl_flags); | |
b3b94faa DT |
553 | } else { |
554 | struct gfs2_holder *next_gh; | |
555 | if (gh->gh_flags & GL_LOCAL_EXCL) | |
556 | return 1; | |
557 | next_gh = list_entry(gl->gl_holders.next, struct gfs2_holder, | |
558 | gh_list); | |
559 | if (next_gh->gh_flags & GL_LOCAL_EXCL) | |
560 | return 1; | |
b3b94faa DT |
561 | } |
562 | ||
563 | list_move_tail(&gh->gh_list, &gl->gl_holders); | |
564 | gh->gh_error = 0; | |
565 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
566 | ||
b3b94faa DT |
567 | complete(&gh->gh_wait); |
568 | ||
569 | return 0; | |
570 | } | |
571 | ||
572 | /** | |
573 | * rq_demote - process a demote request in the queue | |
574 | * @gh: the glock holder | |
575 | * | |
576 | * Returns: 1 if the queue is blocked | |
577 | */ | |
578 | ||
579 | static int rq_demote(struct gfs2_holder *gh) | |
580 | { | |
581 | struct gfs2_glock *gl = gh->gh_gl; | |
8fb4b536 | 582 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
583 | |
584 | if (!list_empty(&gl->gl_holders)) | |
585 | return 1; | |
586 | ||
587 | if (gl->gl_state == gh->gh_state || gl->gl_state == LM_ST_UNLOCKED) { | |
588 | list_del_init(&gh->gh_list); | |
589 | gh->gh_error = 0; | |
590 | spin_unlock(&gl->gl_spin); | |
591 | if (test_bit(HIF_DEALLOC, &gh->gh_iflags)) | |
592 | gfs2_holder_put(gh); | |
593 | else | |
594 | complete(&gh->gh_wait); | |
595 | spin_lock(&gl->gl_spin); | |
596 | } else { | |
597 | gl->gl_req_gh = gh; | |
598 | set_bit(GLF_LOCK, &gl->gl_flags); | |
599 | spin_unlock(&gl->gl_spin); | |
600 | ||
601 | if (gh->gh_state == LM_ST_UNLOCKED || | |
602 | gl->gl_state != LM_ST_EXCLUSIVE) | |
603 | glops->go_drop_th(gl); | |
604 | else | |
605 | glops->go_xmote_th(gl, gh->gh_state, gh->gh_flags); | |
606 | ||
607 | spin_lock(&gl->gl_spin); | |
608 | } | |
609 | ||
610 | return 0; | |
611 | } | |
612 | ||
613 | /** | |
614 | * rq_greedy - process a queued request to drop greedy status | |
615 | * @gh: the glock holder | |
616 | * | |
617 | * Returns: 1 if the queue is blocked | |
618 | */ | |
619 | ||
620 | static int rq_greedy(struct gfs2_holder *gh) | |
621 | { | |
622 | struct gfs2_glock *gl = gh->gh_gl; | |
623 | ||
624 | list_del_init(&gh->gh_list); | |
625 | /* gh->gh_error never examined. */ | |
626 | clear_bit(GLF_GREEDY, &gl->gl_flags); | |
627 | spin_unlock(&gl->gl_spin); | |
628 | ||
629 | gfs2_holder_uninit(gh); | |
630 | kfree(container_of(gh, struct greedy, gr_gh)); | |
631 | ||
632 | spin_lock(&gl->gl_spin); | |
633 | ||
634 | return 0; | |
635 | } | |
636 | ||
637 | /** | |
638 | * run_queue - process holder structures on a glock | |
639 | * @gl: the glock | |
640 | * | |
641 | */ | |
b3b94faa DT |
642 | static void run_queue(struct gfs2_glock *gl) |
643 | { | |
644 | struct gfs2_holder *gh; | |
645 | int blocked = 1; | |
646 | ||
647 | for (;;) { | |
648 | if (test_bit(GLF_LOCK, &gl->gl_flags)) | |
649 | break; | |
650 | ||
651 | if (!list_empty(&gl->gl_waiters1)) { | |
652 | gh = list_entry(gl->gl_waiters1.next, | |
653 | struct gfs2_holder, gh_list); | |
654 | ||
655 | if (test_bit(HIF_MUTEX, &gh->gh_iflags)) | |
656 | blocked = rq_mutex(gh); | |
657 | else | |
658 | gfs2_assert_warn(gl->gl_sbd, 0); | |
659 | ||
660 | } else if (!list_empty(&gl->gl_waiters2) && | |
661 | !test_bit(GLF_SKIP_WAITERS2, &gl->gl_flags)) { | |
662 | gh = list_entry(gl->gl_waiters2.next, | |
663 | struct gfs2_holder, gh_list); | |
664 | ||
665 | if (test_bit(HIF_DEMOTE, &gh->gh_iflags)) | |
666 | blocked = rq_demote(gh); | |
667 | else if (test_bit(HIF_GREEDY, &gh->gh_iflags)) | |
668 | blocked = rq_greedy(gh); | |
669 | else | |
670 | gfs2_assert_warn(gl->gl_sbd, 0); | |
671 | ||
672 | } else if (!list_empty(&gl->gl_waiters3)) { | |
673 | gh = list_entry(gl->gl_waiters3.next, | |
674 | struct gfs2_holder, gh_list); | |
675 | ||
676 | if (test_bit(HIF_PROMOTE, &gh->gh_iflags)) | |
677 | blocked = rq_promote(gh); | |
678 | else | |
679 | gfs2_assert_warn(gl->gl_sbd, 0); | |
680 | ||
681 | } else | |
682 | break; | |
683 | ||
684 | if (blocked) | |
685 | break; | |
686 | } | |
687 | } | |
688 | ||
689 | /** | |
690 | * gfs2_glmutex_lock - acquire a local lock on a glock | |
691 | * @gl: the glock | |
692 | * | |
693 | * Gives caller exclusive access to manipulate a glock structure. | |
694 | */ | |
695 | ||
feaa7bba | 696 | static void gfs2_glmutex_lock(struct gfs2_glock *gl) |
b3b94faa DT |
697 | { |
698 | struct gfs2_holder gh; | |
699 | ||
700 | gfs2_holder_init(gl, 0, 0, &gh); | |
701 | set_bit(HIF_MUTEX, &gh.gh_iflags); | |
702 | ||
703 | spin_lock(&gl->gl_spin); | |
85d1da67 | 704 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) { |
b3b94faa | 705 | list_add_tail(&gh.gh_list, &gl->gl_waiters1); |
85d1da67 | 706 | } else { |
320dd101 SW |
707 | gl->gl_owner = current; |
708 | gl->gl_ip = (unsigned long)__builtin_return_address(0); | |
b3b94faa | 709 | complete(&gh.gh_wait); |
320dd101 | 710 | } |
b3b94faa DT |
711 | spin_unlock(&gl->gl_spin); |
712 | ||
713 | wait_for_completion(&gh.gh_wait); | |
714 | gfs2_holder_uninit(&gh); | |
715 | } | |
716 | ||
717 | /** | |
718 | * gfs2_glmutex_trylock - try to acquire a local lock on a glock | |
719 | * @gl: the glock | |
720 | * | |
721 | * Returns: 1 if the glock is acquired | |
722 | */ | |
723 | ||
08bc2dbc | 724 | static int gfs2_glmutex_trylock(struct gfs2_glock *gl) |
b3b94faa DT |
725 | { |
726 | int acquired = 1; | |
727 | ||
728 | spin_lock(&gl->gl_spin); | |
85d1da67 | 729 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) { |
b3b94faa | 730 | acquired = 0; |
85d1da67 | 731 | } else { |
320dd101 SW |
732 | gl->gl_owner = current; |
733 | gl->gl_ip = (unsigned long)__builtin_return_address(0); | |
734 | } | |
b3b94faa DT |
735 | spin_unlock(&gl->gl_spin); |
736 | ||
737 | return acquired; | |
738 | } | |
739 | ||
740 | /** | |
741 | * gfs2_glmutex_unlock - release a local lock on a glock | |
742 | * @gl: the glock | |
743 | * | |
744 | */ | |
745 | ||
feaa7bba | 746 | static void gfs2_glmutex_unlock(struct gfs2_glock *gl) |
b3b94faa DT |
747 | { |
748 | spin_lock(&gl->gl_spin); | |
749 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
320dd101 SW |
750 | gl->gl_owner = NULL; |
751 | gl->gl_ip = 0; | |
b3b94faa | 752 | run_queue(gl); |
190562bd | 753 | BUG_ON(!spin_is_locked(&gl->gl_spin)); |
b3b94faa DT |
754 | spin_unlock(&gl->gl_spin); |
755 | } | |
756 | ||
757 | /** | |
758 | * handle_callback - add a demote request to a lock's queue | |
759 | * @gl: the glock | |
760 | * @state: the state the caller wants us to change to | |
761 | * | |
af18ddb8 | 762 | * Note: This may fail sliently if we are out of memory. |
b3b94faa DT |
763 | */ |
764 | ||
765 | static void handle_callback(struct gfs2_glock *gl, unsigned int state) | |
766 | { | |
767 | struct gfs2_holder *gh, *new_gh = NULL; | |
768 | ||
feaa7bba | 769 | restart: |
b3b94faa DT |
770 | spin_lock(&gl->gl_spin); |
771 | ||
772 | list_for_each_entry(gh, &gl->gl_waiters2, gh_list) { | |
773 | if (test_bit(HIF_DEMOTE, &gh->gh_iflags) && | |
774 | gl->gl_req_gh != gh) { | |
775 | if (gh->gh_state != state) | |
776 | gh->gh_state = LM_ST_UNLOCKED; | |
777 | goto out; | |
778 | } | |
779 | } | |
780 | ||
781 | if (new_gh) { | |
782 | list_add_tail(&new_gh->gh_list, &gl->gl_waiters2); | |
783 | new_gh = NULL; | |
784 | } else { | |
785 | spin_unlock(&gl->gl_spin); | |
786 | ||
af18ddb8 SW |
787 | new_gh = gfs2_holder_get(gl, state, LM_FLAG_TRY, GFP_KERNEL); |
788 | if (!new_gh) | |
789 | return; | |
b3b94faa DT |
790 | set_bit(HIF_DEMOTE, &new_gh->gh_iflags); |
791 | set_bit(HIF_DEALLOC, &new_gh->gh_iflags); | |
792 | ||
793 | goto restart; | |
794 | } | |
795 | ||
feaa7bba | 796 | out: |
b3b94faa DT |
797 | spin_unlock(&gl->gl_spin); |
798 | ||
799 | if (new_gh) | |
800 | gfs2_holder_put(new_gh); | |
801 | } | |
802 | ||
feaa7bba SW |
803 | void gfs2_glock_inode_squish(struct inode *inode) |
804 | { | |
805 | struct gfs2_holder gh; | |
806 | struct gfs2_glock *gl = GFS2_I(inode)->i_gl; | |
807 | gfs2_holder_init(gl, LM_ST_UNLOCKED, 0, &gh); | |
808 | set_bit(HIF_DEMOTE, &gh.gh_iflags); | |
809 | spin_lock(&gl->gl_spin); | |
810 | gfs2_assert(inode->i_sb->s_fs_info, list_empty(&gl->gl_holders)); | |
811 | list_add_tail(&gh.gh_list, &gl->gl_waiters2); | |
812 | run_queue(gl); | |
813 | spin_unlock(&gl->gl_spin); | |
5dd9feaf | 814 | wait_for_completion(&gh.gh_wait); |
feaa7bba SW |
815 | gfs2_holder_uninit(&gh); |
816 | } | |
817 | ||
b3b94faa DT |
818 | /** |
819 | * state_change - record that the glock is now in a different state | |
820 | * @gl: the glock | |
821 | * @new_state the new state | |
822 | * | |
823 | */ | |
824 | ||
825 | static void state_change(struct gfs2_glock *gl, unsigned int new_state) | |
826 | { | |
b3b94faa DT |
827 | int held1, held2; |
828 | ||
829 | held1 = (gl->gl_state != LM_ST_UNLOCKED); | |
830 | held2 = (new_state != LM_ST_UNLOCKED); | |
831 | ||
832 | if (held1 != held2) { | |
6a6b3d01 | 833 | if (held2) |
b3b94faa | 834 | gfs2_glock_hold(gl); |
6a6b3d01 | 835 | else |
b3b94faa | 836 | gfs2_glock_put(gl); |
b3b94faa DT |
837 | } |
838 | ||
839 | gl->gl_state = new_state; | |
840 | } | |
841 | ||
842 | /** | |
843 | * xmote_bh - Called after the lock module is done acquiring a lock | |
844 | * @gl: The glock in question | |
845 | * @ret: the int returned from the lock module | |
846 | * | |
847 | */ | |
848 | ||
849 | static void xmote_bh(struct gfs2_glock *gl, unsigned int ret) | |
850 | { | |
851 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 852 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
853 | struct gfs2_holder *gh = gl->gl_req_gh; |
854 | int prev_state = gl->gl_state; | |
855 | int op_done = 1; | |
856 | ||
857 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
858 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
859 | gfs2_assert_warn(sdp, !(ret & LM_OUT_ASYNC)); | |
860 | ||
861 | state_change(gl, ret & LM_OUT_ST_MASK); | |
862 | ||
863 | if (prev_state != LM_ST_UNLOCKED && !(ret & LM_OUT_CACHEABLE)) { | |
864 | if (glops->go_inval) | |
865 | glops->go_inval(gl, DIO_METADATA | DIO_DATA); | |
866 | } else if (gl->gl_state == LM_ST_DEFERRED) { | |
867 | /* We might not want to do this here. | |
868 | Look at moving to the inode glops. */ | |
869 | if (glops->go_inval) | |
870 | glops->go_inval(gl, DIO_DATA); | |
871 | } | |
872 | ||
873 | /* Deal with each possible exit condition */ | |
874 | ||
875 | if (!gh) | |
876 | gl->gl_stamp = jiffies; | |
b3b94faa DT |
877 | else if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) { |
878 | spin_lock(&gl->gl_spin); | |
879 | list_del_init(&gh->gh_list); | |
880 | gh->gh_error = -EIO; | |
b3b94faa | 881 | spin_unlock(&gl->gl_spin); |
b3b94faa DT |
882 | } else if (test_bit(HIF_DEMOTE, &gh->gh_iflags)) { |
883 | spin_lock(&gl->gl_spin); | |
884 | list_del_init(&gh->gh_list); | |
885 | if (gl->gl_state == gh->gh_state || | |
85d1da67 | 886 | gl->gl_state == LM_ST_UNLOCKED) { |
b3b94faa | 887 | gh->gh_error = 0; |
85d1da67 | 888 | } else { |
b3b94faa DT |
889 | if (gfs2_assert_warn(sdp, gh->gh_flags & |
890 | (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) == -1) | |
891 | fs_warn(sdp, "ret = 0x%.8X\n", ret); | |
892 | gh->gh_error = GLR_TRYFAILED; | |
893 | } | |
894 | spin_unlock(&gl->gl_spin); | |
895 | ||
896 | if (ret & LM_OUT_CANCELED) | |
50299965 | 897 | handle_callback(gl, LM_ST_UNLOCKED); |
b3b94faa DT |
898 | |
899 | } else if (ret & LM_OUT_CANCELED) { | |
900 | spin_lock(&gl->gl_spin); | |
901 | list_del_init(&gh->gh_list); | |
902 | gh->gh_error = GLR_CANCELED; | |
b3b94faa DT |
903 | spin_unlock(&gl->gl_spin); |
904 | ||
905 | } else if (relaxed_state_ok(gl->gl_state, gh->gh_state, gh->gh_flags)) { | |
906 | spin_lock(&gl->gl_spin); | |
907 | list_move_tail(&gh->gh_list, &gl->gl_holders); | |
908 | gh->gh_error = 0; | |
909 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
910 | spin_unlock(&gl->gl_spin); | |
911 | ||
912 | set_bit(HIF_FIRST, &gh->gh_iflags); | |
913 | ||
914 | op_done = 0; | |
915 | ||
916 | } else if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { | |
917 | spin_lock(&gl->gl_spin); | |
918 | list_del_init(&gh->gh_list); | |
919 | gh->gh_error = GLR_TRYFAILED; | |
b3b94faa DT |
920 | spin_unlock(&gl->gl_spin); |
921 | ||
922 | } else { | |
923 | if (gfs2_assert_withdraw(sdp, 0) == -1) | |
924 | fs_err(sdp, "ret = 0x%.8X\n", ret); | |
925 | } | |
926 | ||
927 | if (glops->go_xmote_bh) | |
928 | glops->go_xmote_bh(gl); | |
929 | ||
930 | if (op_done) { | |
931 | spin_lock(&gl->gl_spin); | |
932 | gl->gl_req_gh = NULL; | |
933 | gl->gl_req_bh = NULL; | |
934 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
935 | run_queue(gl); | |
936 | spin_unlock(&gl->gl_spin); | |
937 | } | |
938 | ||
939 | gfs2_glock_put(gl); | |
940 | ||
941 | if (gh) { | |
942 | if (test_bit(HIF_DEALLOC, &gh->gh_iflags)) | |
943 | gfs2_holder_put(gh); | |
944 | else | |
945 | complete(&gh->gh_wait); | |
946 | } | |
947 | } | |
948 | ||
949 | /** | |
950 | * gfs2_glock_xmote_th - Call into the lock module to acquire or change a glock | |
951 | * @gl: The glock in question | |
952 | * @state: the requested state | |
953 | * @flags: modifier flags to the lock call | |
954 | * | |
955 | */ | |
956 | ||
957 | void gfs2_glock_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags) | |
958 | { | |
959 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 960 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
961 | int lck_flags = flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB | |
962 | LM_FLAG_NOEXP | LM_FLAG_ANY | | |
963 | LM_FLAG_PRIORITY); | |
964 | unsigned int lck_ret; | |
965 | ||
966 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
967 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
968 | gfs2_assert_warn(sdp, state != LM_ST_UNLOCKED); | |
969 | gfs2_assert_warn(sdp, state != gl->gl_state); | |
970 | ||
50299965 SW |
971 | if (gl->gl_state == LM_ST_EXCLUSIVE && glops->go_sync) |
972 | glops->go_sync(gl, DIO_METADATA | DIO_DATA | DIO_RELEASE); | |
b3b94faa DT |
973 | |
974 | gfs2_glock_hold(gl); | |
975 | gl->gl_req_bh = xmote_bh; | |
976 | ||
ec45d9f5 | 977 | lck_ret = gfs2_lm_lock(sdp, gl->gl_lock, gl->gl_state, state, lck_flags); |
b3b94faa DT |
978 | |
979 | if (gfs2_assert_withdraw(sdp, !(lck_ret & LM_OUT_ERROR))) | |
980 | return; | |
981 | ||
982 | if (lck_ret & LM_OUT_ASYNC) | |
983 | gfs2_assert_warn(sdp, lck_ret == LM_OUT_ASYNC); | |
984 | else | |
985 | xmote_bh(gl, lck_ret); | |
986 | } | |
987 | ||
988 | /** | |
989 | * drop_bh - Called after a lock module unlock completes | |
990 | * @gl: the glock | |
991 | * @ret: the return status | |
992 | * | |
993 | * Doesn't wake up the process waiting on the struct gfs2_holder (if any) | |
994 | * Doesn't drop the reference on the glock the top half took out | |
995 | * | |
996 | */ | |
997 | ||
998 | static void drop_bh(struct gfs2_glock *gl, unsigned int ret) | |
999 | { | |
1000 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 1001 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
1002 | struct gfs2_holder *gh = gl->gl_req_gh; |
1003 | ||
1004 | clear_bit(GLF_PREFETCH, &gl->gl_flags); | |
1005 | ||
1006 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
1007 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
1008 | gfs2_assert_warn(sdp, !ret); | |
1009 | ||
1010 | state_change(gl, LM_ST_UNLOCKED); | |
1011 | ||
1012 | if (glops->go_inval) | |
1013 | glops->go_inval(gl, DIO_METADATA | DIO_DATA); | |
1014 | ||
1015 | if (gh) { | |
1016 | spin_lock(&gl->gl_spin); | |
1017 | list_del_init(&gh->gh_list); | |
1018 | gh->gh_error = 0; | |
1019 | spin_unlock(&gl->gl_spin); | |
1020 | } | |
1021 | ||
1022 | if (glops->go_drop_bh) | |
1023 | glops->go_drop_bh(gl); | |
1024 | ||
1025 | spin_lock(&gl->gl_spin); | |
1026 | gl->gl_req_gh = NULL; | |
1027 | gl->gl_req_bh = NULL; | |
1028 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
1029 | run_queue(gl); | |
1030 | spin_unlock(&gl->gl_spin); | |
1031 | ||
1032 | gfs2_glock_put(gl); | |
1033 | ||
1034 | if (gh) { | |
1035 | if (test_bit(HIF_DEALLOC, &gh->gh_iflags)) | |
1036 | gfs2_holder_put(gh); | |
1037 | else | |
1038 | complete(&gh->gh_wait); | |
1039 | } | |
1040 | } | |
1041 | ||
1042 | /** | |
1043 | * gfs2_glock_drop_th - call into the lock module to unlock a lock | |
1044 | * @gl: the glock | |
1045 | * | |
1046 | */ | |
1047 | ||
1048 | void gfs2_glock_drop_th(struct gfs2_glock *gl) | |
1049 | { | |
1050 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 1051 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
1052 | unsigned int ret; |
1053 | ||
1054 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
1055 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
1056 | gfs2_assert_warn(sdp, gl->gl_state != LM_ST_UNLOCKED); | |
1057 | ||
50299965 SW |
1058 | if (gl->gl_state == LM_ST_EXCLUSIVE && glops->go_sync) |
1059 | glops->go_sync(gl, DIO_METADATA | DIO_DATA | DIO_RELEASE); | |
b3b94faa DT |
1060 | |
1061 | gfs2_glock_hold(gl); | |
1062 | gl->gl_req_bh = drop_bh; | |
1063 | ||
b3b94faa DT |
1064 | ret = gfs2_lm_unlock(sdp, gl->gl_lock, gl->gl_state); |
1065 | ||
1066 | if (gfs2_assert_withdraw(sdp, !(ret & LM_OUT_ERROR))) | |
1067 | return; | |
1068 | ||
1069 | if (!ret) | |
1070 | drop_bh(gl, ret); | |
1071 | else | |
1072 | gfs2_assert_warn(sdp, ret == LM_OUT_ASYNC); | |
1073 | } | |
1074 | ||
1075 | /** | |
1076 | * do_cancels - cancel requests for locks stuck waiting on an expire flag | |
1077 | * @gh: the LM_FLAG_PRIORITY holder waiting to acquire the lock | |
1078 | * | |
1079 | * Don't cancel GL_NOCANCEL requests. | |
1080 | */ | |
1081 | ||
1082 | static void do_cancels(struct gfs2_holder *gh) | |
1083 | { | |
1084 | struct gfs2_glock *gl = gh->gh_gl; | |
1085 | ||
1086 | spin_lock(&gl->gl_spin); | |
1087 | ||
1088 | while (gl->gl_req_gh != gh && | |
1089 | !test_bit(HIF_HOLDER, &gh->gh_iflags) && | |
1090 | !list_empty(&gh->gh_list)) { | |
50299965 SW |
1091 | if (gl->gl_req_bh && !(gl->gl_req_gh && |
1092 | (gl->gl_req_gh->gh_flags & GL_NOCANCEL))) { | |
b3b94faa DT |
1093 | spin_unlock(&gl->gl_spin); |
1094 | gfs2_lm_cancel(gl->gl_sbd, gl->gl_lock); | |
1095 | msleep(100); | |
1096 | spin_lock(&gl->gl_spin); | |
1097 | } else { | |
1098 | spin_unlock(&gl->gl_spin); | |
1099 | msleep(100); | |
1100 | spin_lock(&gl->gl_spin); | |
1101 | } | |
1102 | } | |
1103 | ||
1104 | spin_unlock(&gl->gl_spin); | |
1105 | } | |
1106 | ||
1107 | /** | |
1108 | * glock_wait_internal - wait on a glock acquisition | |
1109 | * @gh: the glock holder | |
1110 | * | |
1111 | * Returns: 0 on success | |
1112 | */ | |
1113 | ||
1114 | static int glock_wait_internal(struct gfs2_holder *gh) | |
1115 | { | |
1116 | struct gfs2_glock *gl = gh->gh_gl; | |
1117 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 1118 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
1119 | |
1120 | if (test_bit(HIF_ABORTED, &gh->gh_iflags)) | |
1121 | return -EIO; | |
1122 | ||
1123 | if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { | |
1124 | spin_lock(&gl->gl_spin); | |
1125 | if (gl->gl_req_gh != gh && | |
1126 | !test_bit(HIF_HOLDER, &gh->gh_iflags) && | |
1127 | !list_empty(&gh->gh_list)) { | |
1128 | list_del_init(&gh->gh_list); | |
1129 | gh->gh_error = GLR_TRYFAILED; | |
b3b94faa DT |
1130 | run_queue(gl); |
1131 | spin_unlock(&gl->gl_spin); | |
1132 | return gh->gh_error; | |
1133 | } | |
1134 | spin_unlock(&gl->gl_spin); | |
1135 | } | |
1136 | ||
1137 | if (gh->gh_flags & LM_FLAG_PRIORITY) | |
1138 | do_cancels(gh); | |
1139 | ||
1140 | wait_for_completion(&gh->gh_wait); | |
1141 | ||
1142 | if (gh->gh_error) | |
1143 | return gh->gh_error; | |
1144 | ||
1145 | gfs2_assert_withdraw(sdp, test_bit(HIF_HOLDER, &gh->gh_iflags)); | |
85d1da67 | 1146 | gfs2_assert_withdraw(sdp, relaxed_state_ok(gl->gl_state, gh->gh_state, |
b3b94faa DT |
1147 | gh->gh_flags)); |
1148 | ||
1149 | if (test_bit(HIF_FIRST, &gh->gh_iflags)) { | |
1150 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
1151 | ||
1152 | if (glops->go_lock) { | |
1153 | gh->gh_error = glops->go_lock(gh); | |
1154 | if (gh->gh_error) { | |
1155 | spin_lock(&gl->gl_spin); | |
1156 | list_del_init(&gh->gh_list); | |
b3b94faa DT |
1157 | spin_unlock(&gl->gl_spin); |
1158 | } | |
1159 | } | |
1160 | ||
1161 | spin_lock(&gl->gl_spin); | |
1162 | gl->gl_req_gh = NULL; | |
1163 | gl->gl_req_bh = NULL; | |
1164 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
b3b94faa DT |
1165 | run_queue(gl); |
1166 | spin_unlock(&gl->gl_spin); | |
1167 | } | |
1168 | ||
1169 | return gh->gh_error; | |
1170 | } | |
1171 | ||
1172 | static inline struct gfs2_holder * | |
1173 | find_holder_by_owner(struct list_head *head, struct task_struct *owner) | |
1174 | { | |
1175 | struct gfs2_holder *gh; | |
1176 | ||
1177 | list_for_each_entry(gh, head, gh_list) { | |
1178 | if (gh->gh_owner == owner) | |
1179 | return gh; | |
1180 | } | |
1181 | ||
1182 | return NULL; | |
1183 | } | |
1184 | ||
b3b94faa DT |
1185 | /** |
1186 | * add_to_queue - Add a holder to the wait queue (but look for recursion) | |
1187 | * @gh: the holder structure to add | |
1188 | * | |
1189 | */ | |
1190 | ||
1191 | static void add_to_queue(struct gfs2_holder *gh) | |
1192 | { | |
1193 | struct gfs2_glock *gl = gh->gh_gl; | |
1194 | struct gfs2_holder *existing; | |
1195 | ||
190562bd SW |
1196 | BUG_ON(!gh->gh_owner); |
1197 | ||
b3b94faa DT |
1198 | existing = find_holder_by_owner(&gl->gl_holders, gh->gh_owner); |
1199 | if (existing) { | |
5965b1f4 | 1200 | print_symbol(KERN_WARNING "original: %s\n", existing->gh_ip); |
86384605 AD |
1201 | printk(KERN_INFO "pid : %d\n", existing->gh_owner->pid); |
1202 | printk(KERN_INFO "lock type : %d lock state : %d\n", | |
1203 | existing->gh_gl->gl_name.ln_type, existing->gh_gl->gl_state); | |
5965b1f4 | 1204 | print_symbol(KERN_WARNING "new: %s\n", gh->gh_ip); |
86384605 AD |
1205 | printk(KERN_INFO "pid : %d\n", gh->gh_owner->pid); |
1206 | printk(KERN_INFO "lock type : %d lock state : %d\n", | |
1207 | gl->gl_name.ln_type, gl->gl_state); | |
5965b1f4 | 1208 | BUG(); |
b3b94faa DT |
1209 | } |
1210 | ||
1211 | existing = find_holder_by_owner(&gl->gl_waiters3, gh->gh_owner); | |
1212 | if (existing) { | |
5965b1f4 SW |
1213 | print_symbol(KERN_WARNING "original: %s\n", existing->gh_ip); |
1214 | print_symbol(KERN_WARNING "new: %s\n", gh->gh_ip); | |
1215 | BUG(); | |
b3b94faa DT |
1216 | } |
1217 | ||
b3b94faa DT |
1218 | if (gh->gh_flags & LM_FLAG_PRIORITY) |
1219 | list_add(&gh->gh_list, &gl->gl_waiters3); | |
1220 | else | |
1221 | list_add_tail(&gh->gh_list, &gl->gl_waiters3); | |
1222 | } | |
1223 | ||
1224 | /** | |
1225 | * gfs2_glock_nq - enqueue a struct gfs2_holder onto a glock (acquire a glock) | |
1226 | * @gh: the holder structure | |
1227 | * | |
1228 | * if (gh->gh_flags & GL_ASYNC), this never returns an error | |
1229 | * | |
1230 | * Returns: 0, GLR_TRYFAILED, or errno on failure | |
1231 | */ | |
1232 | ||
1233 | int gfs2_glock_nq(struct gfs2_holder *gh) | |
1234 | { | |
1235 | struct gfs2_glock *gl = gh->gh_gl; | |
1236 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1237 | int error = 0; | |
1238 | ||
320dd101 | 1239 | restart: |
b3b94faa DT |
1240 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) { |
1241 | set_bit(HIF_ABORTED, &gh->gh_iflags); | |
1242 | return -EIO; | |
1243 | } | |
1244 | ||
1245 | set_bit(HIF_PROMOTE, &gh->gh_iflags); | |
1246 | ||
1247 | spin_lock(&gl->gl_spin); | |
1248 | add_to_queue(gh); | |
1249 | run_queue(gl); | |
1250 | spin_unlock(&gl->gl_spin); | |
1251 | ||
1252 | if (!(gh->gh_flags & GL_ASYNC)) { | |
1253 | error = glock_wait_internal(gh); | |
1254 | if (error == GLR_CANCELED) { | |
190562bd | 1255 | msleep(100); |
b3b94faa DT |
1256 | goto restart; |
1257 | } | |
1258 | } | |
1259 | ||
1260 | clear_bit(GLF_PREFETCH, &gl->gl_flags); | |
1261 | ||
320dd101 SW |
1262 | if (error == GLR_TRYFAILED && (gh->gh_flags & GL_DUMP)) |
1263 | dump_glock(gl); | |
1264 | ||
b3b94faa DT |
1265 | return error; |
1266 | } | |
1267 | ||
1268 | /** | |
1269 | * gfs2_glock_poll - poll to see if an async request has been completed | |
1270 | * @gh: the holder | |
1271 | * | |
1272 | * Returns: 1 if the request is ready to be gfs2_glock_wait()ed on | |
1273 | */ | |
1274 | ||
1275 | int gfs2_glock_poll(struct gfs2_holder *gh) | |
1276 | { | |
1277 | struct gfs2_glock *gl = gh->gh_gl; | |
1278 | int ready = 0; | |
1279 | ||
1280 | spin_lock(&gl->gl_spin); | |
1281 | ||
1282 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
1283 | ready = 1; | |
1284 | else if (list_empty(&gh->gh_list)) { | |
1285 | if (gh->gh_error == GLR_CANCELED) { | |
1286 | spin_unlock(&gl->gl_spin); | |
190562bd | 1287 | msleep(100); |
b3b94faa DT |
1288 | if (gfs2_glock_nq(gh)) |
1289 | return 1; | |
1290 | return 0; | |
1291 | } else | |
1292 | ready = 1; | |
1293 | } | |
1294 | ||
1295 | spin_unlock(&gl->gl_spin); | |
1296 | ||
1297 | return ready; | |
1298 | } | |
1299 | ||
1300 | /** | |
1301 | * gfs2_glock_wait - wait for a lock acquisition that ended in a GLR_ASYNC | |
1302 | * @gh: the holder structure | |
1303 | * | |
1304 | * Returns: 0, GLR_TRYFAILED, or errno on failure | |
1305 | */ | |
1306 | ||
1307 | int gfs2_glock_wait(struct gfs2_holder *gh) | |
1308 | { | |
1309 | int error; | |
1310 | ||
1311 | error = glock_wait_internal(gh); | |
1312 | if (error == GLR_CANCELED) { | |
190562bd | 1313 | msleep(100); |
b3b94faa DT |
1314 | gh->gh_flags &= ~GL_ASYNC; |
1315 | error = gfs2_glock_nq(gh); | |
1316 | } | |
1317 | ||
1318 | return error; | |
1319 | } | |
1320 | ||
1321 | /** | |
1322 | * gfs2_glock_dq - dequeue a struct gfs2_holder from a glock (release a glock) | |
1323 | * @gh: the glock holder | |
1324 | * | |
1325 | */ | |
1326 | ||
1327 | void gfs2_glock_dq(struct gfs2_holder *gh) | |
1328 | { | |
1329 | struct gfs2_glock *gl = gh->gh_gl; | |
8fb4b536 | 1330 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa | 1331 | |
b3b94faa DT |
1332 | if (gh->gh_flags & GL_NOCACHE) |
1333 | handle_callback(gl, LM_ST_UNLOCKED); | |
1334 | ||
1335 | gfs2_glmutex_lock(gl); | |
1336 | ||
1337 | spin_lock(&gl->gl_spin); | |
1338 | list_del_init(&gh->gh_list); | |
1339 | ||
1340 | if (list_empty(&gl->gl_holders)) { | |
1341 | spin_unlock(&gl->gl_spin); | |
1342 | ||
1343 | if (glops->go_unlock) | |
1344 | glops->go_unlock(gh); | |
1345 | ||
b3b94faa DT |
1346 | gl->gl_stamp = jiffies; |
1347 | ||
1348 | spin_lock(&gl->gl_spin); | |
1349 | } | |
1350 | ||
1351 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
1352 | run_queue(gl); | |
1353 | spin_unlock(&gl->gl_spin); | |
1354 | } | |
1355 | ||
1356 | /** | |
1357 | * gfs2_glock_prefetch - Try to prefetch a glock | |
1358 | * @gl: the glock | |
1359 | * @state: the state to prefetch in | |
1360 | * @flags: flags passed to go_xmote_th() | |
1361 | * | |
1362 | */ | |
1363 | ||
08bc2dbc AB |
1364 | static void gfs2_glock_prefetch(struct gfs2_glock *gl, unsigned int state, |
1365 | int flags) | |
b3b94faa | 1366 | { |
8fb4b536 | 1367 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
1368 | |
1369 | spin_lock(&gl->gl_spin); | |
1370 | ||
50299965 SW |
1371 | if (test_bit(GLF_LOCK, &gl->gl_flags) || !list_empty(&gl->gl_holders) || |
1372 | !list_empty(&gl->gl_waiters1) || !list_empty(&gl->gl_waiters2) || | |
b3b94faa DT |
1373 | !list_empty(&gl->gl_waiters3) || |
1374 | relaxed_state_ok(gl->gl_state, state, flags)) { | |
1375 | spin_unlock(&gl->gl_spin); | |
1376 | return; | |
1377 | } | |
1378 | ||
1379 | set_bit(GLF_PREFETCH, &gl->gl_flags); | |
1380 | set_bit(GLF_LOCK, &gl->gl_flags); | |
1381 | spin_unlock(&gl->gl_spin); | |
1382 | ||
1383 | glops->go_xmote_th(gl, state, flags); | |
b3b94faa DT |
1384 | } |
1385 | ||
b3b94faa DT |
1386 | static void greedy_work(void *data) |
1387 | { | |
e7f5c01c | 1388 | struct greedy *gr = data; |
b3b94faa DT |
1389 | struct gfs2_holder *gh = &gr->gr_gh; |
1390 | struct gfs2_glock *gl = gh->gh_gl; | |
8fb4b536 | 1391 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
1392 | |
1393 | clear_bit(GLF_SKIP_WAITERS2, &gl->gl_flags); | |
1394 | ||
1395 | if (glops->go_greedy) | |
1396 | glops->go_greedy(gl); | |
1397 | ||
1398 | spin_lock(&gl->gl_spin); | |
1399 | ||
1400 | if (list_empty(&gl->gl_waiters2)) { | |
1401 | clear_bit(GLF_GREEDY, &gl->gl_flags); | |
1402 | spin_unlock(&gl->gl_spin); | |
1403 | gfs2_holder_uninit(gh); | |
1404 | kfree(gr); | |
1405 | } else { | |
1406 | gfs2_glock_hold(gl); | |
1407 | list_add_tail(&gh->gh_list, &gl->gl_waiters2); | |
1408 | run_queue(gl); | |
1409 | spin_unlock(&gl->gl_spin); | |
1410 | gfs2_glock_put(gl); | |
1411 | } | |
1412 | } | |
1413 | ||
1414 | /** | |
1415 | * gfs2_glock_be_greedy - | |
1416 | * @gl: | |
1417 | * @time: | |
1418 | * | |
1419 | * Returns: 0 if go_greedy will be called, 1 otherwise | |
1420 | */ | |
1421 | ||
1422 | int gfs2_glock_be_greedy(struct gfs2_glock *gl, unsigned int time) | |
1423 | { | |
1424 | struct greedy *gr; | |
1425 | struct gfs2_holder *gh; | |
1426 | ||
feaa7bba | 1427 | if (!time || gl->gl_sbd->sd_args.ar_localcaching || |
b3b94faa DT |
1428 | test_and_set_bit(GLF_GREEDY, &gl->gl_flags)) |
1429 | return 1; | |
1430 | ||
1431 | gr = kmalloc(sizeof(struct greedy), GFP_KERNEL); | |
1432 | if (!gr) { | |
1433 | clear_bit(GLF_GREEDY, &gl->gl_flags); | |
1434 | return 1; | |
1435 | } | |
1436 | gh = &gr->gr_gh; | |
1437 | ||
579b78a4 | 1438 | gfs2_holder_init(gl, 0, 0, gh); |
b3b94faa DT |
1439 | set_bit(HIF_GREEDY, &gh->gh_iflags); |
1440 | INIT_WORK(&gr->gr_work, greedy_work, gr); | |
1441 | ||
1442 | set_bit(GLF_SKIP_WAITERS2, &gl->gl_flags); | |
1443 | schedule_delayed_work(&gr->gr_work, time); | |
1444 | ||
1445 | return 0; | |
1446 | } | |
1447 | ||
b3b94faa DT |
1448 | /** |
1449 | * gfs2_glock_dq_uninit - dequeue a holder from a glock and initialize it | |
1450 | * @gh: the holder structure | |
1451 | * | |
1452 | */ | |
1453 | ||
1454 | void gfs2_glock_dq_uninit(struct gfs2_holder *gh) | |
1455 | { | |
1456 | gfs2_glock_dq(gh); | |
1457 | gfs2_holder_uninit(gh); | |
1458 | } | |
1459 | ||
1460 | /** | |
1461 | * gfs2_glock_nq_num - acquire a glock based on lock number | |
1462 | * @sdp: the filesystem | |
1463 | * @number: the lock number | |
1464 | * @glops: the glock operations for the type of glock | |
1465 | * @state: the state to acquire the glock in | |
1466 | * @flags: modifier flags for the aquisition | |
1467 | * @gh: the struct gfs2_holder | |
1468 | * | |
1469 | * Returns: errno | |
1470 | */ | |
1471 | ||
cd915493 | 1472 | int gfs2_glock_nq_num(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 SW |
1473 | const struct gfs2_glock_operations *glops, |
1474 | unsigned int state, int flags, struct gfs2_holder *gh) | |
b3b94faa DT |
1475 | { |
1476 | struct gfs2_glock *gl; | |
1477 | int error; | |
1478 | ||
1479 | error = gfs2_glock_get(sdp, number, glops, CREATE, &gl); | |
1480 | if (!error) { | |
1481 | error = gfs2_glock_nq_init(gl, state, flags, gh); | |
1482 | gfs2_glock_put(gl); | |
1483 | } | |
1484 | ||
1485 | return error; | |
1486 | } | |
1487 | ||
1488 | /** | |
1489 | * glock_compare - Compare two struct gfs2_glock structures for sorting | |
1490 | * @arg_a: the first structure | |
1491 | * @arg_b: the second structure | |
1492 | * | |
1493 | */ | |
1494 | ||
1495 | static int glock_compare(const void *arg_a, const void *arg_b) | |
1496 | { | |
1497 | struct gfs2_holder *gh_a = *(struct gfs2_holder **)arg_a; | |
1498 | struct gfs2_holder *gh_b = *(struct gfs2_holder **)arg_b; | |
1499 | struct lm_lockname *a = &gh_a->gh_gl->gl_name; | |
1500 | struct lm_lockname *b = &gh_b->gh_gl->gl_name; | |
1501 | int ret = 0; | |
1502 | ||
1503 | if (a->ln_number > b->ln_number) | |
1504 | ret = 1; | |
1505 | else if (a->ln_number < b->ln_number) | |
1506 | ret = -1; | |
1507 | else { | |
1508 | if (gh_a->gh_state == LM_ST_SHARED && | |
1509 | gh_b->gh_state == LM_ST_EXCLUSIVE) | |
1510 | ret = 1; | |
1511 | else if (!(gh_a->gh_flags & GL_LOCAL_EXCL) && | |
1512 | (gh_b->gh_flags & GL_LOCAL_EXCL)) | |
1513 | ret = 1; | |
1514 | } | |
1515 | ||
1516 | return ret; | |
1517 | } | |
1518 | ||
1519 | /** | |
1520 | * nq_m_sync - synchonously acquire more than one glock in deadlock free order | |
1521 | * @num_gh: the number of structures | |
1522 | * @ghs: an array of struct gfs2_holder structures | |
1523 | * | |
1524 | * Returns: 0 on success (all glocks acquired), | |
1525 | * errno on failure (no glocks acquired) | |
1526 | */ | |
1527 | ||
1528 | static int nq_m_sync(unsigned int num_gh, struct gfs2_holder *ghs, | |
1529 | struct gfs2_holder **p) | |
1530 | { | |
1531 | unsigned int x; | |
1532 | int error = 0; | |
1533 | ||
1534 | for (x = 0; x < num_gh; x++) | |
1535 | p[x] = &ghs[x]; | |
1536 | ||
1537 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare, NULL); | |
1538 | ||
1539 | for (x = 0; x < num_gh; x++) { | |
1540 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1541 | ||
1542 | error = gfs2_glock_nq(p[x]); | |
1543 | if (error) { | |
1544 | while (x--) | |
1545 | gfs2_glock_dq(p[x]); | |
1546 | break; | |
1547 | } | |
1548 | } | |
1549 | ||
1550 | return error; | |
1551 | } | |
1552 | ||
1553 | /** | |
1554 | * gfs2_glock_nq_m - acquire multiple glocks | |
1555 | * @num_gh: the number of structures | |
1556 | * @ghs: an array of struct gfs2_holder structures | |
1557 | * | |
1558 | * Figure out how big an impact this function has. Either: | |
1559 | * 1) Replace this code with code that calls gfs2_glock_prefetch() | |
1560 | * 2) Forget async stuff and just call nq_m_sync() | |
1561 | * 3) Leave it like it is | |
1562 | * | |
1563 | * Returns: 0 on success (all glocks acquired), | |
1564 | * errno on failure (no glocks acquired) | |
1565 | */ | |
1566 | ||
1567 | int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1568 | { | |
1569 | int *e; | |
1570 | unsigned int x; | |
1571 | int borked = 0, serious = 0; | |
1572 | int error = 0; | |
1573 | ||
1574 | if (!num_gh) | |
1575 | return 0; | |
1576 | ||
1577 | if (num_gh == 1) { | |
1578 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1579 | return gfs2_glock_nq(ghs); | |
1580 | } | |
1581 | ||
1582 | e = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL); | |
1583 | if (!e) | |
1584 | return -ENOMEM; | |
1585 | ||
1586 | for (x = 0; x < num_gh; x++) { | |
1587 | ghs[x].gh_flags |= LM_FLAG_TRY | GL_ASYNC; | |
1588 | error = gfs2_glock_nq(&ghs[x]); | |
1589 | if (error) { | |
1590 | borked = 1; | |
1591 | serious = error; | |
1592 | num_gh = x; | |
1593 | break; | |
1594 | } | |
1595 | } | |
1596 | ||
1597 | for (x = 0; x < num_gh; x++) { | |
1598 | error = e[x] = glock_wait_internal(&ghs[x]); | |
1599 | if (error) { | |
1600 | borked = 1; | |
1601 | if (error != GLR_TRYFAILED && error != GLR_CANCELED) | |
1602 | serious = error; | |
1603 | } | |
1604 | } | |
1605 | ||
1606 | if (!borked) { | |
1607 | kfree(e); | |
1608 | return 0; | |
1609 | } | |
1610 | ||
1611 | for (x = 0; x < num_gh; x++) | |
1612 | if (!e[x]) | |
1613 | gfs2_glock_dq(&ghs[x]); | |
1614 | ||
1615 | if (serious) | |
1616 | error = serious; | |
1617 | else { | |
1618 | for (x = 0; x < num_gh; x++) | |
1619 | gfs2_holder_reinit(ghs[x].gh_state, ghs[x].gh_flags, | |
1620 | &ghs[x]); | |
1621 | error = nq_m_sync(num_gh, ghs, (struct gfs2_holder **)e); | |
1622 | } | |
1623 | ||
1624 | kfree(e); | |
1625 | ||
1626 | return error; | |
1627 | } | |
1628 | ||
1629 | /** | |
1630 | * gfs2_glock_dq_m - release multiple glocks | |
1631 | * @num_gh: the number of structures | |
1632 | * @ghs: an array of struct gfs2_holder structures | |
1633 | * | |
1634 | */ | |
1635 | ||
1636 | void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1637 | { | |
1638 | unsigned int x; | |
1639 | ||
1640 | for (x = 0; x < num_gh; x++) | |
1641 | gfs2_glock_dq(&ghs[x]); | |
1642 | } | |
1643 | ||
1644 | /** | |
1645 | * gfs2_glock_dq_uninit_m - release multiple glocks | |
1646 | * @num_gh: the number of structures | |
1647 | * @ghs: an array of struct gfs2_holder structures | |
1648 | * | |
1649 | */ | |
1650 | ||
1651 | void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1652 | { | |
1653 | unsigned int x; | |
1654 | ||
1655 | for (x = 0; x < num_gh; x++) | |
1656 | gfs2_glock_dq_uninit(&ghs[x]); | |
1657 | } | |
1658 | ||
1659 | /** | |
1660 | * gfs2_glock_prefetch_num - prefetch a glock based on lock number | |
1661 | * @sdp: the filesystem | |
1662 | * @number: the lock number | |
1663 | * @glops: the glock operations for the type of glock | |
1664 | * @state: the state to acquire the glock in | |
1665 | * @flags: modifier flags for the aquisition | |
1666 | * | |
1667 | * Returns: errno | |
1668 | */ | |
1669 | ||
cd915493 | 1670 | void gfs2_glock_prefetch_num(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 | 1671 | const struct gfs2_glock_operations *glops, |
b3b94faa DT |
1672 | unsigned int state, int flags) |
1673 | { | |
1674 | struct gfs2_glock *gl; | |
1675 | int error; | |
1676 | ||
1677 | if (atomic_read(&sdp->sd_reclaim_count) < | |
1678 | gfs2_tune_get(sdp, gt_reclaim_limit)) { | |
1679 | error = gfs2_glock_get(sdp, number, glops, CREATE, &gl); | |
1680 | if (!error) { | |
1681 | gfs2_glock_prefetch(gl, state, flags); | |
1682 | gfs2_glock_put(gl); | |
1683 | } | |
1684 | } | |
1685 | } | |
1686 | ||
1687 | /** | |
1688 | * gfs2_lvb_hold - attach a LVB from a glock | |
1689 | * @gl: The glock in question | |
1690 | * | |
1691 | */ | |
1692 | ||
1693 | int gfs2_lvb_hold(struct gfs2_glock *gl) | |
1694 | { | |
1695 | int error; | |
1696 | ||
1697 | gfs2_glmutex_lock(gl); | |
1698 | ||
1699 | if (!atomic_read(&gl->gl_lvb_count)) { | |
1700 | error = gfs2_lm_hold_lvb(gl->gl_sbd, gl->gl_lock, &gl->gl_lvb); | |
1701 | if (error) { | |
1702 | gfs2_glmutex_unlock(gl); | |
1703 | return error; | |
1704 | } | |
1705 | gfs2_glock_hold(gl); | |
1706 | } | |
1707 | atomic_inc(&gl->gl_lvb_count); | |
1708 | ||
1709 | gfs2_glmutex_unlock(gl); | |
1710 | ||
1711 | return 0; | |
1712 | } | |
1713 | ||
1714 | /** | |
1715 | * gfs2_lvb_unhold - detach a LVB from a glock | |
1716 | * @gl: The glock in question | |
1717 | * | |
1718 | */ | |
1719 | ||
1720 | void gfs2_lvb_unhold(struct gfs2_glock *gl) | |
1721 | { | |
1722 | gfs2_glock_hold(gl); | |
1723 | gfs2_glmutex_lock(gl); | |
1724 | ||
1725 | gfs2_assert(gl->gl_sbd, atomic_read(&gl->gl_lvb_count) > 0); | |
1726 | if (atomic_dec_and_test(&gl->gl_lvb_count)) { | |
1727 | gfs2_lm_unhold_lvb(gl->gl_sbd, gl->gl_lock, gl->gl_lvb); | |
1728 | gl->gl_lvb = NULL; | |
1729 | gfs2_glock_put(gl); | |
1730 | } | |
1731 | ||
1732 | gfs2_glmutex_unlock(gl); | |
1733 | gfs2_glock_put(gl); | |
1734 | } | |
1735 | ||
b3b94faa DT |
1736 | static void blocking_cb(struct gfs2_sbd *sdp, struct lm_lockname *name, |
1737 | unsigned int state) | |
1738 | { | |
1739 | struct gfs2_glock *gl; | |
1740 | ||
1741 | gl = gfs2_glock_find(sdp, name); | |
1742 | if (!gl) | |
1743 | return; | |
1744 | ||
1745 | if (gl->gl_ops->go_callback) | |
1746 | gl->gl_ops->go_callback(gl, state); | |
1747 | handle_callback(gl, state); | |
1748 | ||
1749 | spin_lock(&gl->gl_spin); | |
1750 | run_queue(gl); | |
1751 | spin_unlock(&gl->gl_spin); | |
1752 | ||
1753 | gfs2_glock_put(gl); | |
1754 | } | |
1755 | ||
1756 | /** | |
1757 | * gfs2_glock_cb - Callback used by locking module | |
1c089c32 | 1758 | * @sdp: Pointer to the superblock |
b3b94faa DT |
1759 | * @type: Type of callback |
1760 | * @data: Type dependent data pointer | |
1761 | * | |
1762 | * Called by the locking module when it wants to tell us something. | |
1763 | * Either we need to drop a lock, one of our ASYNC requests completed, or | |
1764 | * a journal from another client needs to be recovered. | |
1765 | */ | |
1766 | ||
9b47c11d | 1767 | void gfs2_glock_cb(void *cb_data, unsigned int type, void *data) |
b3b94faa | 1768 | { |
9b47c11d | 1769 | struct gfs2_sbd *sdp = cb_data; |
b3b94faa | 1770 | |
b3b94faa DT |
1771 | switch (type) { |
1772 | case LM_CB_NEED_E: | |
e7f5c01c | 1773 | blocking_cb(sdp, data, LM_ST_UNLOCKED); |
b3b94faa DT |
1774 | return; |
1775 | ||
1776 | case LM_CB_NEED_D: | |
e7f5c01c | 1777 | blocking_cb(sdp, data, LM_ST_DEFERRED); |
b3b94faa DT |
1778 | return; |
1779 | ||
1780 | case LM_CB_NEED_S: | |
e7f5c01c | 1781 | blocking_cb(sdp, data, LM_ST_SHARED); |
b3b94faa DT |
1782 | return; |
1783 | ||
1784 | case LM_CB_ASYNC: { | |
e7f5c01c | 1785 | struct lm_async_cb *async = data; |
b3b94faa DT |
1786 | struct gfs2_glock *gl; |
1787 | ||
1788 | gl = gfs2_glock_find(sdp, &async->lc_name); | |
1789 | if (gfs2_assert_warn(sdp, gl)) | |
1790 | return; | |
1791 | if (!gfs2_assert_warn(sdp, gl->gl_req_bh)) | |
1792 | gl->gl_req_bh(gl, async->lc_ret); | |
1793 | gfs2_glock_put(gl); | |
b3b94faa DT |
1794 | return; |
1795 | } | |
1796 | ||
1797 | case LM_CB_NEED_RECOVERY: | |
1798 | gfs2_jdesc_make_dirty(sdp, *(unsigned int *)data); | |
1799 | if (sdp->sd_recoverd_process) | |
1800 | wake_up_process(sdp->sd_recoverd_process); | |
1801 | return; | |
1802 | ||
1803 | case LM_CB_DROPLOCKS: | |
1804 | gfs2_gl_hash_clear(sdp, NO_WAIT); | |
1805 | gfs2_quota_scan(sdp); | |
1806 | return; | |
1807 | ||
1808 | default: | |
1809 | gfs2_assert_warn(sdp, 0); | |
1810 | return; | |
1811 | } | |
1812 | } | |
1813 | ||
b3b94faa DT |
1814 | /** |
1815 | * gfs2_iopen_go_callback - Try to kick the inode/vnode associated with an | |
1816 | * iopen glock from memory | |
1817 | * @io_gl: the iopen glock | |
1818 | * @state: the state into which the glock should be put | |
1819 | * | |
1820 | */ | |
1821 | ||
1822 | void gfs2_iopen_go_callback(struct gfs2_glock *io_gl, unsigned int state) | |
1823 | { | |
b3b94faa DT |
1824 | |
1825 | if (state != LM_ST_UNLOCKED) | |
1826 | return; | |
feaa7bba | 1827 | /* FIXME: remove this? */ |
b3b94faa DT |
1828 | } |
1829 | ||
1830 | /** | |
1831 | * demote_ok - Check to see if it's ok to unlock a glock | |
1832 | * @gl: the glock | |
1833 | * | |
1834 | * Returns: 1 if it's ok | |
1835 | */ | |
1836 | ||
1837 | static int demote_ok(struct gfs2_glock *gl) | |
1838 | { | |
1839 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 1840 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
1841 | int demote = 1; |
1842 | ||
1843 | if (test_bit(GLF_STICKY, &gl->gl_flags)) | |
1844 | demote = 0; | |
1845 | else if (test_bit(GLF_PREFETCH, &gl->gl_flags)) | |
50299965 | 1846 | demote = time_after_eq(jiffies, gl->gl_stamp + |
b3b94faa DT |
1847 | gfs2_tune_get(sdp, gt_prefetch_secs) * HZ); |
1848 | else if (glops->go_demote_ok) | |
1849 | demote = glops->go_demote_ok(gl); | |
1850 | ||
1851 | return demote; | |
1852 | } | |
1853 | ||
1854 | /** | |
1855 | * gfs2_glock_schedule_for_reclaim - Add a glock to the reclaim list | |
1856 | * @gl: the glock | |
1857 | * | |
1858 | */ | |
1859 | ||
1860 | void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl) | |
1861 | { | |
1862 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1863 | ||
1864 | spin_lock(&sdp->sd_reclaim_lock); | |
1865 | if (list_empty(&gl->gl_reclaim)) { | |
1866 | gfs2_glock_hold(gl); | |
1867 | list_add(&gl->gl_reclaim, &sdp->sd_reclaim_list); | |
1868 | atomic_inc(&sdp->sd_reclaim_count); | |
1869 | } | |
1870 | spin_unlock(&sdp->sd_reclaim_lock); | |
1871 | ||
1872 | wake_up(&sdp->sd_reclaim_wq); | |
1873 | } | |
1874 | ||
1875 | /** | |
1876 | * gfs2_reclaim_glock - process the next glock on the filesystem's reclaim list | |
1877 | * @sdp: the filesystem | |
1878 | * | |
1879 | * Called from gfs2_glockd() glock reclaim daemon, or when promoting a | |
1880 | * different glock and we notice that there are a lot of glocks in the | |
1881 | * reclaim list. | |
1882 | * | |
1883 | */ | |
1884 | ||
1885 | void gfs2_reclaim_glock(struct gfs2_sbd *sdp) | |
1886 | { | |
1887 | struct gfs2_glock *gl; | |
1888 | ||
1889 | spin_lock(&sdp->sd_reclaim_lock); | |
1890 | if (list_empty(&sdp->sd_reclaim_list)) { | |
1891 | spin_unlock(&sdp->sd_reclaim_lock); | |
1892 | return; | |
1893 | } | |
1894 | gl = list_entry(sdp->sd_reclaim_list.next, | |
1895 | struct gfs2_glock, gl_reclaim); | |
1896 | list_del_init(&gl->gl_reclaim); | |
1897 | spin_unlock(&sdp->sd_reclaim_lock); | |
1898 | ||
1899 | atomic_dec(&sdp->sd_reclaim_count); | |
1900 | atomic_inc(&sdp->sd_reclaimed); | |
1901 | ||
1902 | if (gfs2_glmutex_trylock(gl)) { | |
b3b94faa | 1903 | if (queue_empty(gl, &gl->gl_holders) && |
50299965 | 1904 | gl->gl_state != LM_ST_UNLOCKED && demote_ok(gl)) |
b3b94faa DT |
1905 | handle_callback(gl, LM_ST_UNLOCKED); |
1906 | gfs2_glmutex_unlock(gl); | |
1907 | } | |
1908 | ||
1909 | gfs2_glock_put(gl); | |
1910 | } | |
1911 | ||
1912 | /** | |
1913 | * examine_bucket - Call a function for glock in a hash bucket | |
1914 | * @examiner: the function | |
1915 | * @sdp: the filesystem | |
1916 | * @bucket: the bucket | |
1917 | * | |
1918 | * Returns: 1 if the bucket has entries | |
1919 | */ | |
1920 | ||
1921 | static int examine_bucket(glock_examiner examiner, struct gfs2_sbd *sdp, | |
37b2fa6a | 1922 | unsigned int hash) |
b3b94faa DT |
1923 | { |
1924 | struct glock_plug plug; | |
1925 | struct list_head *tmp; | |
1926 | struct gfs2_glock *gl; | |
1927 | int entries; | |
1928 | ||
1929 | /* Add "plug" to end of bucket list, work back up list from there */ | |
1930 | memset(&plug.gl_flags, 0, sizeof(unsigned long)); | |
1931 | set_bit(GLF_PLUG, &plug.gl_flags); | |
1932 | ||
087efdd3 | 1933 | write_lock(gl_lock_addr(hash)); |
37b2fa6a | 1934 | list_add(&plug.gl_list, &gl_hash_table[hash].hb_list); |
087efdd3 | 1935 | write_unlock(gl_lock_addr(hash)); |
b3b94faa DT |
1936 | |
1937 | for (;;) { | |
087efdd3 | 1938 | write_lock(gl_lock_addr(hash)); |
b3b94faa DT |
1939 | |
1940 | for (;;) { | |
1941 | tmp = plug.gl_list.next; | |
1942 | ||
37b2fa6a | 1943 | if (tmp == &gl_hash_table[hash].hb_list) { |
b3b94faa | 1944 | list_del(&plug.gl_list); |
37b2fa6a | 1945 | entries = !list_empty(&gl_hash_table[hash].hb_list); |
087efdd3 | 1946 | write_unlock(gl_lock_addr(hash)); |
b3b94faa DT |
1947 | return entries; |
1948 | } | |
1949 | gl = list_entry(tmp, struct gfs2_glock, gl_list); | |
1950 | ||
1951 | /* Move plug up list */ | |
1952 | list_move(&plug.gl_list, &gl->gl_list); | |
1953 | ||
1954 | if (test_bit(GLF_PLUG, &gl->gl_flags)) | |
1955 | continue; | |
85d1da67 SW |
1956 | if (gl->gl_sbd != sdp) |
1957 | continue; | |
b3b94faa DT |
1958 | |
1959 | /* examiner() must glock_put() */ | |
1960 | gfs2_glock_hold(gl); | |
1961 | ||
1962 | break; | |
1963 | } | |
1964 | ||
087efdd3 | 1965 | write_unlock(gl_lock_addr(hash)); |
b3b94faa DT |
1966 | |
1967 | examiner(gl); | |
1968 | } | |
1969 | } | |
1970 | ||
1971 | /** | |
1972 | * scan_glock - look at a glock and see if we can reclaim it | |
1973 | * @gl: the glock to look at | |
1974 | * | |
1975 | */ | |
1976 | ||
1977 | static void scan_glock(struct gfs2_glock *gl) | |
1978 | { | |
a2242db0 SW |
1979 | if (gl->gl_ops == &gfs2_inode_glops) |
1980 | goto out; | |
1981 | ||
b3b94faa | 1982 | if (gfs2_glmutex_trylock(gl)) { |
b3b94faa DT |
1983 | if (queue_empty(gl, &gl->gl_holders) && |
1984 | gl->gl_state != LM_ST_UNLOCKED && | |
1985 | demote_ok(gl)) | |
1986 | goto out_schedule; | |
b3b94faa DT |
1987 | gfs2_glmutex_unlock(gl); |
1988 | } | |
a2242db0 | 1989 | out: |
b3b94faa | 1990 | gfs2_glock_put(gl); |
b3b94faa DT |
1991 | return; |
1992 | ||
627add2d | 1993 | out_schedule: |
b3b94faa DT |
1994 | gfs2_glmutex_unlock(gl); |
1995 | gfs2_glock_schedule_for_reclaim(gl); | |
1996 | gfs2_glock_put(gl); | |
1997 | } | |
1998 | ||
1999 | /** | |
2000 | * gfs2_scand_internal - Look for glocks and inodes to toss from memory | |
2001 | * @sdp: the filesystem | |
2002 | * | |
2003 | */ | |
2004 | ||
2005 | void gfs2_scand_internal(struct gfs2_sbd *sdp) | |
2006 | { | |
2007 | unsigned int x; | |
2008 | ||
2009 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) { | |
37b2fa6a | 2010 | examine_bucket(scan_glock, sdp, x); |
b3b94faa DT |
2011 | cond_resched(); |
2012 | } | |
2013 | } | |
2014 | ||
2015 | /** | |
2016 | * clear_glock - look at a glock and see if we can free it from glock cache | |
2017 | * @gl: the glock to look at | |
2018 | * | |
2019 | */ | |
2020 | ||
2021 | static void clear_glock(struct gfs2_glock *gl) | |
2022 | { | |
2023 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
2024 | int released; | |
2025 | ||
2026 | spin_lock(&sdp->sd_reclaim_lock); | |
2027 | if (!list_empty(&gl->gl_reclaim)) { | |
2028 | list_del_init(&gl->gl_reclaim); | |
2029 | atomic_dec(&sdp->sd_reclaim_count); | |
190562bd | 2030 | spin_unlock(&sdp->sd_reclaim_lock); |
b3b94faa DT |
2031 | released = gfs2_glock_put(gl); |
2032 | gfs2_assert(sdp, !released); | |
190562bd SW |
2033 | } else { |
2034 | spin_unlock(&sdp->sd_reclaim_lock); | |
b3b94faa | 2035 | } |
b3b94faa DT |
2036 | |
2037 | if (gfs2_glmutex_trylock(gl)) { | |
b3b94faa DT |
2038 | if (queue_empty(gl, &gl->gl_holders) && |
2039 | gl->gl_state != LM_ST_UNLOCKED) | |
2040 | handle_callback(gl, LM_ST_UNLOCKED); | |
2041 | ||
2042 | gfs2_glmutex_unlock(gl); | |
2043 | } | |
2044 | ||
2045 | gfs2_glock_put(gl); | |
2046 | } | |
2047 | ||
2048 | /** | |
2049 | * gfs2_gl_hash_clear - Empty out the glock hash table | |
2050 | * @sdp: the filesystem | |
2051 | * @wait: wait until it's all gone | |
2052 | * | |
2053 | * Called when unmounting the filesystem, or when inter-node lock manager | |
2054 | * requests DROPLOCKS because it is running out of capacity. | |
2055 | */ | |
2056 | ||
2057 | void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait) | |
2058 | { | |
2059 | unsigned long t; | |
2060 | unsigned int x; | |
2061 | int cont; | |
2062 | ||
2063 | t = jiffies; | |
2064 | ||
2065 | for (;;) { | |
2066 | cont = 0; | |
2067 | ||
2068 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) | |
37b2fa6a | 2069 | if (examine_bucket(clear_glock, sdp, x)) |
b3b94faa DT |
2070 | cont = 1; |
2071 | ||
2072 | if (!wait || !cont) | |
2073 | break; | |
2074 | ||
2075 | if (time_after_eq(jiffies, | |
2076 | t + gfs2_tune_get(sdp, gt_stall_secs) * HZ)) { | |
2077 | fs_warn(sdp, "Unmount seems to be stalled. " | |
2078 | "Dumping lock state...\n"); | |
2079 | gfs2_dump_lockstate(sdp); | |
2080 | t = jiffies; | |
2081 | } | |
2082 | ||
b3b94faa | 2083 | invalidate_inodes(sdp->sd_vfs); |
fd88de56 | 2084 | msleep(10); |
b3b94faa DT |
2085 | } |
2086 | } | |
2087 | ||
2088 | /* | |
2089 | * Diagnostic routines to help debug distributed deadlock | |
2090 | */ | |
2091 | ||
2092 | /** | |
2093 | * dump_holder - print information about a glock holder | |
2094 | * @str: a string naming the type of holder | |
2095 | * @gh: the glock holder | |
2096 | * | |
2097 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
2098 | */ | |
2099 | ||
2100 | static int dump_holder(char *str, struct gfs2_holder *gh) | |
2101 | { | |
2102 | unsigned int x; | |
2103 | int error = -ENOBUFS; | |
2104 | ||
d92a8d48 SW |
2105 | printk(KERN_INFO " %s\n", str); |
2106 | printk(KERN_INFO " owner = %ld\n", | |
b3b94faa | 2107 | (gh->gh_owner) ? (long)gh->gh_owner->pid : -1); |
d92a8d48 SW |
2108 | printk(KERN_INFO " gh_state = %u\n", gh->gh_state); |
2109 | printk(KERN_INFO " gh_flags ="); | |
b3b94faa DT |
2110 | for (x = 0; x < 32; x++) |
2111 | if (gh->gh_flags & (1 << x)) | |
2112 | printk(" %u", x); | |
2113 | printk(" \n"); | |
d92a8d48 SW |
2114 | printk(KERN_INFO " error = %d\n", gh->gh_error); |
2115 | printk(KERN_INFO " gh_iflags ="); | |
b3b94faa DT |
2116 | for (x = 0; x < 32; x++) |
2117 | if (test_bit(x, &gh->gh_iflags)) | |
2118 | printk(" %u", x); | |
2119 | printk(" \n"); | |
d0dc80db | 2120 | print_symbol(KERN_INFO " initialized at: %s\n", gh->gh_ip); |
b3b94faa DT |
2121 | |
2122 | error = 0; | |
2123 | ||
2124 | return error; | |
2125 | } | |
2126 | ||
2127 | /** | |
2128 | * dump_inode - print information about an inode | |
2129 | * @ip: the inode | |
2130 | * | |
2131 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
2132 | */ | |
2133 | ||
2134 | static int dump_inode(struct gfs2_inode *ip) | |
2135 | { | |
2136 | unsigned int x; | |
2137 | int error = -ENOBUFS; | |
2138 | ||
d92a8d48 SW |
2139 | printk(KERN_INFO " Inode:\n"); |
2140 | printk(KERN_INFO " num = %llu %llu\n", | |
382066da SW |
2141 | (unsigned long long)ip->i_num.no_formal_ino, |
2142 | (unsigned long long)ip->i_num.no_addr); | |
d92a8d48 | 2143 | printk(KERN_INFO " type = %u\n", IF2DT(ip->i_di.di_mode)); |
d92a8d48 | 2144 | printk(KERN_INFO " i_flags ="); |
b3b94faa DT |
2145 | for (x = 0; x < 32; x++) |
2146 | if (test_bit(x, &ip->i_flags)) | |
2147 | printk(" %u", x); | |
2148 | printk(" \n"); | |
b3b94faa DT |
2149 | |
2150 | error = 0; | |
2151 | ||
2152 | return error; | |
2153 | } | |
2154 | ||
2155 | /** | |
2156 | * dump_glock - print information about a glock | |
2157 | * @gl: the glock | |
2158 | * @count: where we are in the buffer | |
2159 | * | |
2160 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
2161 | */ | |
2162 | ||
2163 | static int dump_glock(struct gfs2_glock *gl) | |
2164 | { | |
2165 | struct gfs2_holder *gh; | |
2166 | unsigned int x; | |
2167 | int error = -ENOBUFS; | |
2168 | ||
2169 | spin_lock(&gl->gl_spin); | |
2170 | ||
85d1da67 | 2171 | printk(KERN_INFO "Glock 0x%p (%u, %llu)\n", gl, gl->gl_name.ln_type, |
382066da | 2172 | (unsigned long long)gl->gl_name.ln_number); |
d92a8d48 | 2173 | printk(KERN_INFO " gl_flags ="); |
85d1da67 | 2174 | for (x = 0; x < 32; x++) { |
b3b94faa DT |
2175 | if (test_bit(x, &gl->gl_flags)) |
2176 | printk(" %u", x); | |
85d1da67 | 2177 | } |
b3b94faa | 2178 | printk(" \n"); |
d92a8d48 SW |
2179 | printk(KERN_INFO " gl_ref = %d\n", atomic_read(&gl->gl_ref.refcount)); |
2180 | printk(KERN_INFO " gl_state = %u\n", gl->gl_state); | |
320dd101 SW |
2181 | printk(KERN_INFO " gl_owner = %s\n", gl->gl_owner->comm); |
2182 | print_symbol(KERN_INFO " gl_ip = %s\n", gl->gl_ip); | |
d92a8d48 SW |
2183 | printk(KERN_INFO " req_gh = %s\n", (gl->gl_req_gh) ? "yes" : "no"); |
2184 | printk(KERN_INFO " req_bh = %s\n", (gl->gl_req_bh) ? "yes" : "no"); | |
2185 | printk(KERN_INFO " lvb_count = %d\n", atomic_read(&gl->gl_lvb_count)); | |
2186 | printk(KERN_INFO " object = %s\n", (gl->gl_object) ? "yes" : "no"); | |
2187 | printk(KERN_INFO " le = %s\n", | |
b3b94faa | 2188 | (list_empty(&gl->gl_le.le_list)) ? "no" : "yes"); |
d92a8d48 | 2189 | printk(KERN_INFO " reclaim = %s\n", |
b3b94faa DT |
2190 | (list_empty(&gl->gl_reclaim)) ? "no" : "yes"); |
2191 | if (gl->gl_aspace) | |
85d1da67 | 2192 | printk(KERN_INFO " aspace = 0x%p nrpages = %lu\n", gl->gl_aspace, |
88721877 | 2193 | gl->gl_aspace->i_mapping->nrpages); |
b3b94faa | 2194 | else |
d92a8d48 SW |
2195 | printk(KERN_INFO " aspace = no\n"); |
2196 | printk(KERN_INFO " ail = %d\n", atomic_read(&gl->gl_ail_count)); | |
b3b94faa DT |
2197 | if (gl->gl_req_gh) { |
2198 | error = dump_holder("Request", gl->gl_req_gh); | |
2199 | if (error) | |
2200 | goto out; | |
2201 | } | |
2202 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
2203 | error = dump_holder("Holder", gh); | |
2204 | if (error) | |
2205 | goto out; | |
2206 | } | |
2207 | list_for_each_entry(gh, &gl->gl_waiters1, gh_list) { | |
2208 | error = dump_holder("Waiter1", gh); | |
2209 | if (error) | |
2210 | goto out; | |
2211 | } | |
2212 | list_for_each_entry(gh, &gl->gl_waiters2, gh_list) { | |
2213 | error = dump_holder("Waiter2", gh); | |
2214 | if (error) | |
2215 | goto out; | |
2216 | } | |
2217 | list_for_each_entry(gh, &gl->gl_waiters3, gh_list) { | |
2218 | error = dump_holder("Waiter3", gh); | |
2219 | if (error) | |
2220 | goto out; | |
2221 | } | |
5c676f6d | 2222 | if (gl->gl_ops == &gfs2_inode_glops && gl->gl_object) { |
b3b94faa DT |
2223 | if (!test_bit(GLF_LOCK, &gl->gl_flags) && |
2224 | list_empty(&gl->gl_holders)) { | |
5c676f6d | 2225 | error = dump_inode(gl->gl_object); |
b3b94faa DT |
2226 | if (error) |
2227 | goto out; | |
2228 | } else { | |
2229 | error = -ENOBUFS; | |
d92a8d48 | 2230 | printk(KERN_INFO " Inode: busy\n"); |
b3b94faa DT |
2231 | } |
2232 | } | |
2233 | ||
2234 | error = 0; | |
2235 | ||
a91ea69f | 2236 | out: |
b3b94faa | 2237 | spin_unlock(&gl->gl_spin); |
b3b94faa DT |
2238 | return error; |
2239 | } | |
2240 | ||
2241 | /** | |
2242 | * gfs2_dump_lockstate - print out the current lockstate | |
2243 | * @sdp: the filesystem | |
2244 | * @ub: the buffer to copy the information into | |
2245 | * | |
2246 | * If @ub is NULL, dump the lockstate to the console. | |
2247 | * | |
2248 | */ | |
2249 | ||
08bc2dbc | 2250 | static int gfs2_dump_lockstate(struct gfs2_sbd *sdp) |
b3b94faa | 2251 | { |
b3b94faa DT |
2252 | struct gfs2_glock *gl; |
2253 | unsigned int x; | |
2254 | int error = 0; | |
2255 | ||
2256 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) { | |
b3b94faa | 2257 | |
087efdd3 | 2258 | read_lock(gl_lock_addr(x)); |
b3b94faa | 2259 | |
37b2fa6a | 2260 | list_for_each_entry(gl, &gl_hash_table[x].hb_list, gl_list) { |
b3b94faa DT |
2261 | if (test_bit(GLF_PLUG, &gl->gl_flags)) |
2262 | continue; | |
85d1da67 SW |
2263 | if (gl->gl_sbd != sdp) |
2264 | continue; | |
b3b94faa DT |
2265 | |
2266 | error = dump_glock(gl); | |
2267 | if (error) | |
2268 | break; | |
2269 | } | |
2270 | ||
087efdd3 | 2271 | read_unlock(gl_lock_addr(x)); |
b3b94faa DT |
2272 | |
2273 | if (error) | |
2274 | break; | |
2275 | } | |
2276 | ||
2277 | ||
2278 | return error; | |
2279 | } | |
2280 | ||
85d1da67 SW |
2281 | int __init gfs2_glock_init(void) |
2282 | { | |
2283 | unsigned i; | |
2284 | for(i = 0; i < GFS2_GL_HASH_SIZE; i++) { | |
37b2fa6a | 2285 | INIT_LIST_HEAD(&gl_hash_table[i].hb_list); |
85d1da67 | 2286 | } |
087efdd3 SW |
2287 | #ifdef GL_HASH_LOCK_SZ |
2288 | for(i = 0; i < GL_HASH_LOCK_SZ; i++) { | |
2289 | rwlock_init(&gl_hash_locks[i]); | |
2290 | } | |
2291 | #endif | |
85d1da67 SW |
2292 | return 0; |
2293 | } | |
2294 |