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> |
24264434 | 21 | #include <linux/list.h> |
b3b94faa DT |
22 | #include <asm/uaccess.h> |
23 | ||
24 | #include "gfs2.h" | |
5c676f6d SW |
25 | #include "lm_interface.h" |
26 | #include "incore.h" | |
b3b94faa DT |
27 | #include "glock.h" |
28 | #include "glops.h" | |
29 | #include "inode.h" | |
30 | #include "lm.h" | |
31 | #include "lops.h" | |
32 | #include "meta_io.h" | |
33 | #include "quota.h" | |
34 | #include "super.h" | |
5c676f6d | 35 | #include "util.h" |
b3b94faa | 36 | |
b3b94faa DT |
37 | struct greedy { |
38 | struct gfs2_holder gr_gh; | |
39 | struct work_struct gr_work; | |
40 | }; | |
41 | ||
37b2fa6a SW |
42 | struct gfs2_gl_hash_bucket { |
43 | struct list_head hb_list; | |
44 | }; | |
45 | ||
b3b94faa DT |
46 | typedef void (*glock_examiner) (struct gfs2_glock * gl); |
47 | ||
08bc2dbc | 48 | static int gfs2_dump_lockstate(struct gfs2_sbd *sdp); |
320dd101 | 49 | static int dump_glock(struct gfs2_glock *gl); |
24264434 | 50 | static int dump_inode(struct gfs2_inode *ip); |
08bc2dbc | 51 | |
087efdd3 SW |
52 | #define GFS2_GL_HASH_SHIFT 13 |
53 | #define GFS2_GL_HASH_SIZE (1 << GFS2_GL_HASH_SHIFT) | |
54 | #define GFS2_GL_HASH_MASK (GFS2_GL_HASH_SIZE - 1) | |
55 | ||
85d1da67 | 56 | static struct gfs2_gl_hash_bucket gl_hash_table[GFS2_GL_HASH_SIZE]; |
087efdd3 SW |
57 | |
58 | /* | |
59 | * Despite what you might think, the numbers below are not arbitrary :-) | |
60 | * They are taken from the ipv4 routing hash code, which is well tested | |
61 | * and thus should be nearly optimal. Later on we might tweek the numbers | |
62 | * but for now this should be fine. | |
63 | * | |
64 | * The reason for putting the locks in a separate array from the list heads | |
65 | * is that we can have fewer locks than list heads and save memory. We use | |
66 | * the same hash function for both, but with a different hash mask. | |
67 | */ | |
68 | #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) || \ | |
69 | defined(CONFIG_PROVE_LOCKING) | |
70 | ||
71 | #ifdef CONFIG_LOCKDEP | |
72 | # define GL_HASH_LOCK_SZ 256 | |
73 | #else | |
74 | # if NR_CPUS >= 32 | |
75 | # define GL_HASH_LOCK_SZ 4096 | |
76 | # elif NR_CPUS >= 16 | |
77 | # define GL_HASH_LOCK_SZ 2048 | |
78 | # elif NR_CPUS >= 8 | |
79 | # define GL_HASH_LOCK_SZ 1024 | |
80 | # elif NR_CPUS >= 4 | |
81 | # define GL_HASH_LOCK_SZ 512 | |
82 | # else | |
83 | # define GL_HASH_LOCK_SZ 256 | |
84 | # endif | |
85 | #endif | |
86 | ||
87 | /* We never want more locks than chains */ | |
88 | #if GFS2_GL_HASH_SIZE < GL_HASH_LOCK_SZ | |
89 | # undef GL_HASH_LOCK_SZ | |
90 | # define GL_HASH_LOCK_SZ GFS2_GL_HASH_SIZE | |
91 | #endif | |
92 | ||
93 | static rwlock_t gl_hash_locks[GL_HASH_LOCK_SZ]; | |
94 | ||
95 | static inline rwlock_t *gl_lock_addr(unsigned int x) | |
96 | { | |
94610610 | 97 | return &gl_hash_locks[x & (GL_HASH_LOCK_SZ-1)]; |
087efdd3 SW |
98 | } |
99 | #else /* not SMP, so no spinlocks required */ | |
100 | static inline rwlock_t *gl_lock_addr(x) | |
101 | { | |
102 | return NULL; | |
103 | } | |
104 | #endif | |
85d1da67 | 105 | |
b3b94faa DT |
106 | /** |
107 | * relaxed_state_ok - is a requested lock compatible with the current lock mode? | |
108 | * @actual: the current state of the lock | |
109 | * @requested: the lock state that was requested by the caller | |
110 | * @flags: the modifier flags passed in by the caller | |
111 | * | |
112 | * Returns: 1 if the locks are compatible, 0 otherwise | |
113 | */ | |
114 | ||
115 | static inline int relaxed_state_ok(unsigned int actual, unsigned requested, | |
116 | int flags) | |
117 | { | |
118 | if (actual == requested) | |
119 | return 1; | |
120 | ||
121 | if (flags & GL_EXACT) | |
122 | return 0; | |
123 | ||
124 | if (actual == LM_ST_EXCLUSIVE && requested == LM_ST_SHARED) | |
125 | return 1; | |
126 | ||
127 | if (actual != LM_ST_UNLOCKED && (flags & LM_FLAG_ANY)) | |
128 | return 1; | |
129 | ||
130 | return 0; | |
131 | } | |
132 | ||
133 | /** | |
134 | * gl_hash() - Turn glock number into hash bucket number | |
135 | * @lock: The glock number | |
136 | * | |
137 | * Returns: The number of the corresponding hash bucket | |
138 | */ | |
139 | ||
b8547856 SW |
140 | static unsigned int gl_hash(const struct gfs2_sbd *sdp, |
141 | const struct lm_lockname *name) | |
b3b94faa DT |
142 | { |
143 | unsigned int h; | |
144 | ||
cd915493 | 145 | h = jhash(&name->ln_number, sizeof(u64), 0); |
b3b94faa | 146 | h = jhash(&name->ln_type, sizeof(unsigned int), h); |
b8547856 | 147 | h = jhash(&sdp, sizeof(struct gfs2_sbd *), h); |
b3b94faa DT |
148 | h &= GFS2_GL_HASH_MASK; |
149 | ||
150 | return h; | |
151 | } | |
152 | ||
153 | /** | |
154 | * glock_free() - Perform a few checks and then release struct gfs2_glock | |
155 | * @gl: The glock to release | |
156 | * | |
157 | * Also calls lock module to release its internal structure for this glock. | |
158 | * | |
159 | */ | |
160 | ||
161 | static void glock_free(struct gfs2_glock *gl) | |
162 | { | |
163 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
164 | struct inode *aspace = gl->gl_aspace; | |
165 | ||
166 | gfs2_lm_put_lock(sdp, gl->gl_lock); | |
167 | ||
168 | if (aspace) | |
169 | gfs2_aspace_put(aspace); | |
170 | ||
171 | kmem_cache_free(gfs2_glock_cachep, gl); | |
b3b94faa DT |
172 | } |
173 | ||
174 | /** | |
175 | * gfs2_glock_hold() - increment reference count on glock | |
176 | * @gl: The glock to hold | |
177 | * | |
178 | */ | |
179 | ||
180 | void gfs2_glock_hold(struct gfs2_glock *gl) | |
181 | { | |
182 | kref_get(&gl->gl_ref); | |
183 | } | |
184 | ||
185 | /* All work is done after the return from kref_put() so we | |
186 | can release the write_lock before the free. */ | |
187 | ||
188 | static void kill_glock(struct kref *kref) | |
189 | { | |
190 | struct gfs2_glock *gl = container_of(kref, struct gfs2_glock, gl_ref); | |
191 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
192 | ||
193 | gfs2_assert(sdp, gl->gl_state == LM_ST_UNLOCKED); | |
194 | gfs2_assert(sdp, list_empty(&gl->gl_reclaim)); | |
195 | gfs2_assert(sdp, list_empty(&gl->gl_holders)); | |
196 | gfs2_assert(sdp, list_empty(&gl->gl_waiters1)); | |
197 | gfs2_assert(sdp, list_empty(&gl->gl_waiters2)); | |
198 | gfs2_assert(sdp, list_empty(&gl->gl_waiters3)); | |
199 | } | |
200 | ||
201 | /** | |
202 | * gfs2_glock_put() - Decrement reference count on glock | |
203 | * @gl: The glock to put | |
204 | * | |
205 | */ | |
206 | ||
207 | int gfs2_glock_put(struct gfs2_glock *gl) | |
208 | { | |
b3b94faa DT |
209 | int rv = 0; |
210 | ||
087efdd3 | 211 | write_lock(gl_lock_addr(gl->gl_hash)); |
b3b94faa | 212 | if (kref_put(&gl->gl_ref, kill_glock)) { |
24264434 | 213 | list_del_init(&gl->gl_list); |
087efdd3 | 214 | write_unlock(gl_lock_addr(gl->gl_hash)); |
190562bd | 215 | BUG_ON(spin_is_locked(&gl->gl_spin)); |
b3b94faa DT |
216 | glock_free(gl); |
217 | rv = 1; | |
218 | goto out; | |
219 | } | |
087efdd3 | 220 | write_unlock(gl_lock_addr(gl->gl_hash)); |
a2242db0 | 221 | out: |
b3b94faa DT |
222 | return rv; |
223 | } | |
224 | ||
225 | /** | |
226 | * queue_empty - check to see if a glock's queue is empty | |
227 | * @gl: the glock | |
228 | * @head: the head of the queue to check | |
229 | * | |
230 | * This function protects the list in the event that a process already | |
231 | * has a holder on the list and is adding a second holder for itself. | |
232 | * The glmutex lock is what generally prevents processes from working | |
233 | * on the same glock at once, but the special case of adding a second | |
234 | * holder for yourself ("recursive" locking) doesn't involve locking | |
235 | * glmutex, making the spin lock necessary. | |
236 | * | |
237 | * Returns: 1 if the queue is empty | |
238 | */ | |
239 | ||
240 | static inline int queue_empty(struct gfs2_glock *gl, struct list_head *head) | |
241 | { | |
242 | int empty; | |
243 | spin_lock(&gl->gl_spin); | |
244 | empty = list_empty(head); | |
245 | spin_unlock(&gl->gl_spin); | |
246 | return empty; | |
247 | } | |
248 | ||
249 | /** | |
250 | * search_bucket() - Find struct gfs2_glock by lock number | |
251 | * @bucket: the bucket to search | |
252 | * @name: The lock name | |
253 | * | |
254 | * Returns: NULL, or the struct gfs2_glock with the requested number | |
255 | */ | |
256 | ||
37b2fa6a | 257 | static struct gfs2_glock *search_bucket(unsigned int hash, |
899be4d3 | 258 | const struct gfs2_sbd *sdp, |
d6a53727 | 259 | const struct lm_lockname *name) |
b3b94faa DT |
260 | { |
261 | struct gfs2_glock *gl; | |
262 | ||
37b2fa6a | 263 | list_for_each_entry(gl, &gl_hash_table[hash].hb_list, gl_list) { |
b3b94faa DT |
264 | if (!lm_name_equal(&gl->gl_name, name)) |
265 | continue; | |
899be4d3 SW |
266 | if (gl->gl_sbd != sdp) |
267 | continue; | |
b3b94faa DT |
268 | |
269 | kref_get(&gl->gl_ref); | |
270 | ||
271 | return gl; | |
272 | } | |
273 | ||
274 | return NULL; | |
275 | } | |
276 | ||
277 | /** | |
278 | * gfs2_glock_find() - Find glock by lock number | |
279 | * @sdp: The GFS2 superblock | |
280 | * @name: The lock name | |
281 | * | |
282 | * Returns: NULL, or the struct gfs2_glock with the requested number | |
283 | */ | |
284 | ||
85d1da67 | 285 | static struct gfs2_glock *gfs2_glock_find(const struct gfs2_sbd *sdp, |
d6a53727 | 286 | const struct lm_lockname *name) |
b3b94faa | 287 | { |
37b2fa6a | 288 | unsigned int hash = gl_hash(sdp, name); |
b3b94faa DT |
289 | struct gfs2_glock *gl; |
290 | ||
087efdd3 | 291 | read_lock(gl_lock_addr(hash)); |
37b2fa6a | 292 | gl = search_bucket(hash, sdp, name); |
087efdd3 | 293 | read_unlock(gl_lock_addr(hash)); |
b3b94faa DT |
294 | |
295 | return gl; | |
296 | } | |
297 | ||
298 | /** | |
299 | * gfs2_glock_get() - Get a glock, or create one if one doesn't exist | |
300 | * @sdp: The GFS2 superblock | |
301 | * @number: the lock number | |
302 | * @glops: The glock_operations to use | |
303 | * @create: If 0, don't create the glock if it doesn't exist | |
304 | * @glp: the glock is returned here | |
305 | * | |
306 | * This does not lock a glock, just finds/creates structures for one. | |
307 | * | |
308 | * Returns: errno | |
309 | */ | |
310 | ||
cd915493 | 311 | int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 | 312 | const struct gfs2_glock_operations *glops, int create, |
b3b94faa DT |
313 | struct gfs2_glock **glp) |
314 | { | |
37b2fa6a | 315 | struct lm_lockname name = { .ln_number = number, .ln_type = glops->go_type }; |
b3b94faa | 316 | struct gfs2_glock *gl, *tmp; |
37b2fa6a | 317 | unsigned int hash = gl_hash(sdp, &name); |
b3b94faa DT |
318 | int error; |
319 | ||
087efdd3 | 320 | read_lock(gl_lock_addr(hash)); |
37b2fa6a | 321 | gl = search_bucket(hash, sdp, &name); |
087efdd3 | 322 | read_unlock(gl_lock_addr(hash)); |
b3b94faa DT |
323 | |
324 | if (gl || !create) { | |
325 | *glp = gl; | |
326 | return 0; | |
327 | } | |
328 | ||
329 | gl = kmem_cache_alloc(gfs2_glock_cachep, GFP_KERNEL); | |
330 | if (!gl) | |
331 | return -ENOMEM; | |
332 | ||
ec45d9f5 | 333 | gl->gl_flags = 0; |
b3b94faa DT |
334 | gl->gl_name = name; |
335 | kref_init(&gl->gl_ref); | |
b3b94faa | 336 | gl->gl_state = LM_ST_UNLOCKED; |
37b2fa6a | 337 | gl->gl_hash = hash; |
320dd101 SW |
338 | gl->gl_owner = NULL; |
339 | gl->gl_ip = 0; | |
b3b94faa | 340 | gl->gl_ops = glops; |
ec45d9f5 SW |
341 | gl->gl_req_gh = NULL; |
342 | gl->gl_req_bh = NULL; | |
343 | gl->gl_vn = 0; | |
344 | gl->gl_stamp = jiffies; | |
345 | gl->gl_object = NULL; | |
b3b94faa | 346 | gl->gl_sbd = sdp; |
ec45d9f5 | 347 | gl->gl_aspace = NULL; |
b3b94faa | 348 | lops_init_le(&gl->gl_le, &gfs2_glock_lops); |
b3b94faa DT |
349 | |
350 | /* If this glock protects actual on-disk data or metadata blocks, | |
351 | create a VFS inode to manage the pages/buffers holding them. */ | |
50299965 | 352 | if (glops == &gfs2_inode_glops || glops == &gfs2_rgrp_glops) { |
b3b94faa DT |
353 | gl->gl_aspace = gfs2_aspace_get(sdp); |
354 | if (!gl->gl_aspace) { | |
355 | error = -ENOMEM; | |
356 | goto fail; | |
357 | } | |
358 | } | |
359 | ||
360 | error = gfs2_lm_get_lock(sdp, &name, &gl->gl_lock); | |
361 | if (error) | |
362 | goto fail_aspace; | |
363 | ||
087efdd3 | 364 | write_lock(gl_lock_addr(hash)); |
37b2fa6a | 365 | tmp = search_bucket(hash, sdp, &name); |
b3b94faa | 366 | if (tmp) { |
087efdd3 | 367 | write_unlock(gl_lock_addr(hash)); |
b3b94faa DT |
368 | glock_free(gl); |
369 | gl = tmp; | |
370 | } else { | |
37b2fa6a | 371 | list_add_tail(&gl->gl_list, &gl_hash_table[hash].hb_list); |
087efdd3 | 372 | write_unlock(gl_lock_addr(hash)); |
b3b94faa DT |
373 | } |
374 | ||
375 | *glp = gl; | |
376 | ||
377 | return 0; | |
378 | ||
ec45d9f5 | 379 | fail_aspace: |
b3b94faa DT |
380 | if (gl->gl_aspace) |
381 | gfs2_aspace_put(gl->gl_aspace); | |
ec45d9f5 | 382 | fail: |
b3b94faa | 383 | kmem_cache_free(gfs2_glock_cachep, gl); |
b3b94faa DT |
384 | return error; |
385 | } | |
386 | ||
387 | /** | |
388 | * gfs2_holder_init - initialize a struct gfs2_holder in the default way | |
389 | * @gl: the glock | |
390 | * @state: the state we're requesting | |
391 | * @flags: the modifier flags | |
392 | * @gh: the holder structure | |
393 | * | |
394 | */ | |
395 | ||
190562bd | 396 | void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags, |
b3b94faa DT |
397 | struct gfs2_holder *gh) |
398 | { | |
399 | INIT_LIST_HEAD(&gh->gh_list); | |
400 | gh->gh_gl = gl; | |
d0dc80db | 401 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
190562bd | 402 | gh->gh_owner = current; |
b3b94faa DT |
403 | gh->gh_state = state; |
404 | gh->gh_flags = flags; | |
405 | gh->gh_error = 0; | |
406 | gh->gh_iflags = 0; | |
407 | init_completion(&gh->gh_wait); | |
408 | ||
409 | if (gh->gh_state == LM_ST_EXCLUSIVE) | |
410 | gh->gh_flags |= GL_LOCAL_EXCL; | |
411 | ||
412 | gfs2_glock_hold(gl); | |
413 | } | |
414 | ||
415 | /** | |
416 | * gfs2_holder_reinit - reinitialize a struct gfs2_holder so we can requeue it | |
417 | * @state: the state we're requesting | |
418 | * @flags: the modifier flags | |
419 | * @gh: the holder structure | |
420 | * | |
421 | * Don't mess with the glock. | |
422 | * | |
423 | */ | |
424 | ||
190562bd | 425 | void gfs2_holder_reinit(unsigned int state, unsigned flags, struct gfs2_holder *gh) |
b3b94faa DT |
426 | { |
427 | gh->gh_state = state; | |
579b78a4 | 428 | gh->gh_flags = flags; |
b3b94faa DT |
429 | if (gh->gh_state == LM_ST_EXCLUSIVE) |
430 | gh->gh_flags |= GL_LOCAL_EXCL; | |
431 | ||
432 | gh->gh_iflags &= 1 << HIF_ALLOCED; | |
d0dc80db | 433 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
b3b94faa DT |
434 | } |
435 | ||
436 | /** | |
437 | * gfs2_holder_uninit - uninitialize a holder structure (drop glock reference) | |
438 | * @gh: the holder structure | |
439 | * | |
440 | */ | |
441 | ||
442 | void gfs2_holder_uninit(struct gfs2_holder *gh) | |
443 | { | |
444 | gfs2_glock_put(gh->gh_gl); | |
445 | gh->gh_gl = NULL; | |
d0dc80db | 446 | gh->gh_ip = 0; |
b3b94faa DT |
447 | } |
448 | ||
449 | /** | |
450 | * gfs2_holder_get - get a struct gfs2_holder structure | |
451 | * @gl: the glock | |
452 | * @state: the state we're requesting | |
453 | * @flags: the modifier flags | |
af18ddb8 | 454 | * @gfp_flags: |
b3b94faa DT |
455 | * |
456 | * Figure out how big an impact this function has. Either: | |
457 | * 1) Replace it with a cache of structures hanging off the struct gfs2_sbd | |
458 | * 2) Leave it like it is | |
459 | * | |
460 | * Returns: the holder structure, NULL on ENOMEM | |
461 | */ | |
462 | ||
08bc2dbc AB |
463 | static struct gfs2_holder *gfs2_holder_get(struct gfs2_glock *gl, |
464 | unsigned int state, | |
465 | int flags, gfp_t gfp_flags) | |
b3b94faa DT |
466 | { |
467 | struct gfs2_holder *gh; | |
468 | ||
469 | gh = kmalloc(sizeof(struct gfs2_holder), gfp_flags); | |
470 | if (!gh) | |
471 | return NULL; | |
472 | ||
473 | gfs2_holder_init(gl, state, flags, gh); | |
474 | set_bit(HIF_ALLOCED, &gh->gh_iflags); | |
d0dc80db | 475 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
b3b94faa DT |
476 | return gh; |
477 | } | |
478 | ||
479 | /** | |
480 | * gfs2_holder_put - get rid of a struct gfs2_holder structure | |
481 | * @gh: the holder structure | |
482 | * | |
483 | */ | |
484 | ||
08bc2dbc | 485 | static void gfs2_holder_put(struct gfs2_holder *gh) |
b3b94faa DT |
486 | { |
487 | gfs2_holder_uninit(gh); | |
488 | kfree(gh); | |
489 | } | |
490 | ||
b3b94faa DT |
491 | /** |
492 | * rq_mutex - process a mutex request in the queue | |
493 | * @gh: the glock holder | |
494 | * | |
495 | * Returns: 1 if the queue is blocked | |
496 | */ | |
497 | ||
498 | static int rq_mutex(struct gfs2_holder *gh) | |
499 | { | |
500 | struct gfs2_glock *gl = gh->gh_gl; | |
501 | ||
502 | list_del_init(&gh->gh_list); | |
503 | /* gh->gh_error never examined. */ | |
504 | set_bit(GLF_LOCK, &gl->gl_flags); | |
505 | complete(&gh->gh_wait); | |
506 | ||
507 | return 1; | |
508 | } | |
509 | ||
510 | /** | |
511 | * rq_promote - process a promote request in the queue | |
512 | * @gh: the glock holder | |
513 | * | |
514 | * Acquire a new inter-node lock, or change a lock state to more restrictive. | |
515 | * | |
516 | * Returns: 1 if the queue is blocked | |
517 | */ | |
518 | ||
519 | static int rq_promote(struct gfs2_holder *gh) | |
520 | { | |
521 | struct gfs2_glock *gl = gh->gh_gl; | |
522 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 523 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
524 | |
525 | if (!relaxed_state_ok(gl->gl_state, gh->gh_state, gh->gh_flags)) { | |
526 | if (list_empty(&gl->gl_holders)) { | |
527 | gl->gl_req_gh = gh; | |
528 | set_bit(GLF_LOCK, &gl->gl_flags); | |
529 | spin_unlock(&gl->gl_spin); | |
530 | ||
531 | if (atomic_read(&sdp->sd_reclaim_count) > | |
532 | gfs2_tune_get(sdp, gt_reclaim_limit) && | |
533 | !(gh->gh_flags & LM_FLAG_PRIORITY)) { | |
534 | gfs2_reclaim_glock(sdp); | |
535 | gfs2_reclaim_glock(sdp); | |
536 | } | |
537 | ||
ec45d9f5 | 538 | glops->go_xmote_th(gl, gh->gh_state, gh->gh_flags); |
b3b94faa DT |
539 | spin_lock(&gl->gl_spin); |
540 | } | |
541 | return 1; | |
542 | } | |
543 | ||
544 | if (list_empty(&gl->gl_holders)) { | |
545 | set_bit(HIF_FIRST, &gh->gh_iflags); | |
546 | set_bit(GLF_LOCK, &gl->gl_flags); | |
b3b94faa DT |
547 | } else { |
548 | struct gfs2_holder *next_gh; | |
549 | if (gh->gh_flags & GL_LOCAL_EXCL) | |
550 | return 1; | |
551 | next_gh = list_entry(gl->gl_holders.next, struct gfs2_holder, | |
552 | gh_list); | |
553 | if (next_gh->gh_flags & GL_LOCAL_EXCL) | |
554 | return 1; | |
b3b94faa DT |
555 | } |
556 | ||
557 | list_move_tail(&gh->gh_list, &gl->gl_holders); | |
558 | gh->gh_error = 0; | |
559 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
560 | ||
b3b94faa DT |
561 | complete(&gh->gh_wait); |
562 | ||
563 | return 0; | |
564 | } | |
565 | ||
566 | /** | |
567 | * rq_demote - process a demote request in the queue | |
568 | * @gh: the glock holder | |
569 | * | |
570 | * Returns: 1 if the queue is blocked | |
571 | */ | |
572 | ||
573 | static int rq_demote(struct gfs2_holder *gh) | |
574 | { | |
575 | struct gfs2_glock *gl = gh->gh_gl; | |
8fb4b536 | 576 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
577 | |
578 | if (!list_empty(&gl->gl_holders)) | |
579 | return 1; | |
580 | ||
581 | if (gl->gl_state == gh->gh_state || gl->gl_state == LM_ST_UNLOCKED) { | |
582 | list_del_init(&gh->gh_list); | |
583 | gh->gh_error = 0; | |
584 | spin_unlock(&gl->gl_spin); | |
585 | if (test_bit(HIF_DEALLOC, &gh->gh_iflags)) | |
586 | gfs2_holder_put(gh); | |
587 | else | |
588 | complete(&gh->gh_wait); | |
589 | spin_lock(&gl->gl_spin); | |
590 | } else { | |
591 | gl->gl_req_gh = gh; | |
592 | set_bit(GLF_LOCK, &gl->gl_flags); | |
593 | spin_unlock(&gl->gl_spin); | |
594 | ||
595 | if (gh->gh_state == LM_ST_UNLOCKED || | |
596 | gl->gl_state != LM_ST_EXCLUSIVE) | |
597 | glops->go_drop_th(gl); | |
598 | else | |
599 | glops->go_xmote_th(gl, gh->gh_state, gh->gh_flags); | |
600 | ||
601 | spin_lock(&gl->gl_spin); | |
602 | } | |
603 | ||
604 | return 0; | |
605 | } | |
606 | ||
607 | /** | |
608 | * rq_greedy - process a queued request to drop greedy status | |
609 | * @gh: the glock holder | |
610 | * | |
611 | * Returns: 1 if the queue is blocked | |
612 | */ | |
613 | ||
614 | static int rq_greedy(struct gfs2_holder *gh) | |
615 | { | |
616 | struct gfs2_glock *gl = gh->gh_gl; | |
617 | ||
618 | list_del_init(&gh->gh_list); | |
619 | /* gh->gh_error never examined. */ | |
620 | clear_bit(GLF_GREEDY, &gl->gl_flags); | |
621 | spin_unlock(&gl->gl_spin); | |
622 | ||
623 | gfs2_holder_uninit(gh); | |
624 | kfree(container_of(gh, struct greedy, gr_gh)); | |
625 | ||
626 | spin_lock(&gl->gl_spin); | |
627 | ||
628 | return 0; | |
629 | } | |
630 | ||
631 | /** | |
632 | * run_queue - process holder structures on a glock | |
633 | * @gl: the glock | |
634 | * | |
635 | */ | |
b3b94faa DT |
636 | static void run_queue(struct gfs2_glock *gl) |
637 | { | |
638 | struct gfs2_holder *gh; | |
639 | int blocked = 1; | |
640 | ||
641 | for (;;) { | |
642 | if (test_bit(GLF_LOCK, &gl->gl_flags)) | |
643 | break; | |
644 | ||
645 | if (!list_empty(&gl->gl_waiters1)) { | |
646 | gh = list_entry(gl->gl_waiters1.next, | |
647 | struct gfs2_holder, gh_list); | |
648 | ||
649 | if (test_bit(HIF_MUTEX, &gh->gh_iflags)) | |
650 | blocked = rq_mutex(gh); | |
651 | else | |
652 | gfs2_assert_warn(gl->gl_sbd, 0); | |
653 | ||
654 | } else if (!list_empty(&gl->gl_waiters2) && | |
655 | !test_bit(GLF_SKIP_WAITERS2, &gl->gl_flags)) { | |
656 | gh = list_entry(gl->gl_waiters2.next, | |
657 | struct gfs2_holder, gh_list); | |
658 | ||
659 | if (test_bit(HIF_DEMOTE, &gh->gh_iflags)) | |
660 | blocked = rq_demote(gh); | |
661 | else if (test_bit(HIF_GREEDY, &gh->gh_iflags)) | |
662 | blocked = rq_greedy(gh); | |
663 | else | |
664 | gfs2_assert_warn(gl->gl_sbd, 0); | |
665 | ||
666 | } else if (!list_empty(&gl->gl_waiters3)) { | |
667 | gh = list_entry(gl->gl_waiters3.next, | |
668 | struct gfs2_holder, gh_list); | |
669 | ||
670 | if (test_bit(HIF_PROMOTE, &gh->gh_iflags)) | |
671 | blocked = rq_promote(gh); | |
672 | else | |
673 | gfs2_assert_warn(gl->gl_sbd, 0); | |
674 | ||
675 | } else | |
676 | break; | |
677 | ||
678 | if (blocked) | |
679 | break; | |
680 | } | |
681 | } | |
682 | ||
683 | /** | |
684 | * gfs2_glmutex_lock - acquire a local lock on a glock | |
685 | * @gl: the glock | |
686 | * | |
687 | * Gives caller exclusive access to manipulate a glock structure. | |
688 | */ | |
689 | ||
feaa7bba | 690 | static void gfs2_glmutex_lock(struct gfs2_glock *gl) |
b3b94faa DT |
691 | { |
692 | struct gfs2_holder gh; | |
693 | ||
694 | gfs2_holder_init(gl, 0, 0, &gh); | |
695 | set_bit(HIF_MUTEX, &gh.gh_iflags); | |
696 | ||
697 | spin_lock(&gl->gl_spin); | |
85d1da67 | 698 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) { |
b3b94faa | 699 | list_add_tail(&gh.gh_list, &gl->gl_waiters1); |
85d1da67 | 700 | } else { |
320dd101 SW |
701 | gl->gl_owner = current; |
702 | gl->gl_ip = (unsigned long)__builtin_return_address(0); | |
b3b94faa | 703 | complete(&gh.gh_wait); |
320dd101 | 704 | } |
b3b94faa DT |
705 | spin_unlock(&gl->gl_spin); |
706 | ||
707 | wait_for_completion(&gh.gh_wait); | |
708 | gfs2_holder_uninit(&gh); | |
709 | } | |
710 | ||
711 | /** | |
712 | * gfs2_glmutex_trylock - try to acquire a local lock on a glock | |
713 | * @gl: the glock | |
714 | * | |
715 | * Returns: 1 if the glock is acquired | |
716 | */ | |
717 | ||
08bc2dbc | 718 | static int gfs2_glmutex_trylock(struct gfs2_glock *gl) |
b3b94faa DT |
719 | { |
720 | int acquired = 1; | |
721 | ||
722 | spin_lock(&gl->gl_spin); | |
85d1da67 | 723 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) { |
b3b94faa | 724 | acquired = 0; |
85d1da67 | 725 | } else { |
320dd101 SW |
726 | gl->gl_owner = current; |
727 | gl->gl_ip = (unsigned long)__builtin_return_address(0); | |
728 | } | |
b3b94faa DT |
729 | spin_unlock(&gl->gl_spin); |
730 | ||
731 | return acquired; | |
732 | } | |
733 | ||
734 | /** | |
735 | * gfs2_glmutex_unlock - release a local lock on a glock | |
736 | * @gl: the glock | |
737 | * | |
738 | */ | |
739 | ||
feaa7bba | 740 | static void gfs2_glmutex_unlock(struct gfs2_glock *gl) |
b3b94faa DT |
741 | { |
742 | spin_lock(&gl->gl_spin); | |
743 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
320dd101 SW |
744 | gl->gl_owner = NULL; |
745 | gl->gl_ip = 0; | |
b3b94faa | 746 | run_queue(gl); |
190562bd | 747 | BUG_ON(!spin_is_locked(&gl->gl_spin)); |
b3b94faa DT |
748 | spin_unlock(&gl->gl_spin); |
749 | } | |
750 | ||
751 | /** | |
752 | * handle_callback - add a demote request to a lock's queue | |
753 | * @gl: the glock | |
754 | * @state: the state the caller wants us to change to | |
755 | * | |
af18ddb8 | 756 | * Note: This may fail sliently if we are out of memory. |
b3b94faa DT |
757 | */ |
758 | ||
759 | static void handle_callback(struct gfs2_glock *gl, unsigned int state) | |
760 | { | |
761 | struct gfs2_holder *gh, *new_gh = NULL; | |
762 | ||
feaa7bba | 763 | restart: |
b3b94faa DT |
764 | spin_lock(&gl->gl_spin); |
765 | ||
766 | list_for_each_entry(gh, &gl->gl_waiters2, gh_list) { | |
767 | if (test_bit(HIF_DEMOTE, &gh->gh_iflags) && | |
768 | gl->gl_req_gh != gh) { | |
769 | if (gh->gh_state != state) | |
770 | gh->gh_state = LM_ST_UNLOCKED; | |
771 | goto out; | |
772 | } | |
773 | } | |
774 | ||
775 | if (new_gh) { | |
776 | list_add_tail(&new_gh->gh_list, &gl->gl_waiters2); | |
777 | new_gh = NULL; | |
778 | } else { | |
779 | spin_unlock(&gl->gl_spin); | |
780 | ||
af18ddb8 SW |
781 | new_gh = gfs2_holder_get(gl, state, LM_FLAG_TRY, GFP_KERNEL); |
782 | if (!new_gh) | |
783 | return; | |
b3b94faa DT |
784 | set_bit(HIF_DEMOTE, &new_gh->gh_iflags); |
785 | set_bit(HIF_DEALLOC, &new_gh->gh_iflags); | |
786 | ||
787 | goto restart; | |
788 | } | |
789 | ||
feaa7bba | 790 | out: |
b3b94faa DT |
791 | spin_unlock(&gl->gl_spin); |
792 | ||
793 | if (new_gh) | |
794 | gfs2_holder_put(new_gh); | |
795 | } | |
796 | ||
feaa7bba SW |
797 | void gfs2_glock_inode_squish(struct inode *inode) |
798 | { | |
799 | struct gfs2_holder gh; | |
800 | struct gfs2_glock *gl = GFS2_I(inode)->i_gl; | |
801 | gfs2_holder_init(gl, LM_ST_UNLOCKED, 0, &gh); | |
802 | set_bit(HIF_DEMOTE, &gh.gh_iflags); | |
803 | spin_lock(&gl->gl_spin); | |
804 | gfs2_assert(inode->i_sb->s_fs_info, list_empty(&gl->gl_holders)); | |
805 | list_add_tail(&gh.gh_list, &gl->gl_waiters2); | |
806 | run_queue(gl); | |
807 | spin_unlock(&gl->gl_spin); | |
5dd9feaf | 808 | wait_for_completion(&gh.gh_wait); |
feaa7bba SW |
809 | gfs2_holder_uninit(&gh); |
810 | } | |
811 | ||
b3b94faa DT |
812 | /** |
813 | * state_change - record that the glock is now in a different state | |
814 | * @gl: the glock | |
815 | * @new_state the new state | |
816 | * | |
817 | */ | |
818 | ||
819 | static void state_change(struct gfs2_glock *gl, unsigned int new_state) | |
820 | { | |
b3b94faa DT |
821 | int held1, held2; |
822 | ||
823 | held1 = (gl->gl_state != LM_ST_UNLOCKED); | |
824 | held2 = (new_state != LM_ST_UNLOCKED); | |
825 | ||
826 | if (held1 != held2) { | |
6a6b3d01 | 827 | if (held2) |
b3b94faa | 828 | gfs2_glock_hold(gl); |
6a6b3d01 | 829 | else |
b3b94faa | 830 | gfs2_glock_put(gl); |
b3b94faa DT |
831 | } |
832 | ||
833 | gl->gl_state = new_state; | |
834 | } | |
835 | ||
836 | /** | |
837 | * xmote_bh - Called after the lock module is done acquiring a lock | |
838 | * @gl: The glock in question | |
839 | * @ret: the int returned from the lock module | |
840 | * | |
841 | */ | |
842 | ||
843 | static void xmote_bh(struct gfs2_glock *gl, unsigned int ret) | |
844 | { | |
845 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 846 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
847 | struct gfs2_holder *gh = gl->gl_req_gh; |
848 | int prev_state = gl->gl_state; | |
849 | int op_done = 1; | |
850 | ||
851 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
852 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
853 | gfs2_assert_warn(sdp, !(ret & LM_OUT_ASYNC)); | |
854 | ||
855 | state_change(gl, ret & LM_OUT_ST_MASK); | |
856 | ||
857 | if (prev_state != LM_ST_UNLOCKED && !(ret & LM_OUT_CACHEABLE)) { | |
858 | if (glops->go_inval) | |
859 | glops->go_inval(gl, DIO_METADATA | DIO_DATA); | |
860 | } else if (gl->gl_state == LM_ST_DEFERRED) { | |
861 | /* We might not want to do this here. | |
862 | Look at moving to the inode glops. */ | |
863 | if (glops->go_inval) | |
864 | glops->go_inval(gl, DIO_DATA); | |
865 | } | |
866 | ||
867 | /* Deal with each possible exit condition */ | |
868 | ||
869 | if (!gh) | |
870 | gl->gl_stamp = jiffies; | |
b3b94faa DT |
871 | else if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) { |
872 | spin_lock(&gl->gl_spin); | |
873 | list_del_init(&gh->gh_list); | |
874 | gh->gh_error = -EIO; | |
b3b94faa | 875 | spin_unlock(&gl->gl_spin); |
b3b94faa DT |
876 | } else if (test_bit(HIF_DEMOTE, &gh->gh_iflags)) { |
877 | spin_lock(&gl->gl_spin); | |
878 | list_del_init(&gh->gh_list); | |
879 | if (gl->gl_state == gh->gh_state || | |
85d1da67 | 880 | gl->gl_state == LM_ST_UNLOCKED) { |
b3b94faa | 881 | gh->gh_error = 0; |
85d1da67 | 882 | } else { |
b3b94faa DT |
883 | if (gfs2_assert_warn(sdp, gh->gh_flags & |
884 | (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) == -1) | |
885 | fs_warn(sdp, "ret = 0x%.8X\n", ret); | |
886 | gh->gh_error = GLR_TRYFAILED; | |
887 | } | |
888 | spin_unlock(&gl->gl_spin); | |
889 | ||
890 | if (ret & LM_OUT_CANCELED) | |
50299965 | 891 | handle_callback(gl, LM_ST_UNLOCKED); |
b3b94faa DT |
892 | |
893 | } else if (ret & LM_OUT_CANCELED) { | |
894 | spin_lock(&gl->gl_spin); | |
895 | list_del_init(&gh->gh_list); | |
896 | gh->gh_error = GLR_CANCELED; | |
b3b94faa DT |
897 | spin_unlock(&gl->gl_spin); |
898 | ||
899 | } else if (relaxed_state_ok(gl->gl_state, gh->gh_state, gh->gh_flags)) { | |
900 | spin_lock(&gl->gl_spin); | |
901 | list_move_tail(&gh->gh_list, &gl->gl_holders); | |
902 | gh->gh_error = 0; | |
903 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
904 | spin_unlock(&gl->gl_spin); | |
905 | ||
906 | set_bit(HIF_FIRST, &gh->gh_iflags); | |
907 | ||
908 | op_done = 0; | |
909 | ||
910 | } else if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { | |
911 | spin_lock(&gl->gl_spin); | |
912 | list_del_init(&gh->gh_list); | |
913 | gh->gh_error = GLR_TRYFAILED; | |
b3b94faa DT |
914 | spin_unlock(&gl->gl_spin); |
915 | ||
916 | } else { | |
917 | if (gfs2_assert_withdraw(sdp, 0) == -1) | |
918 | fs_err(sdp, "ret = 0x%.8X\n", ret); | |
919 | } | |
920 | ||
921 | if (glops->go_xmote_bh) | |
922 | glops->go_xmote_bh(gl); | |
923 | ||
924 | if (op_done) { | |
925 | spin_lock(&gl->gl_spin); | |
926 | gl->gl_req_gh = NULL; | |
927 | gl->gl_req_bh = NULL; | |
928 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
929 | run_queue(gl); | |
930 | spin_unlock(&gl->gl_spin); | |
931 | } | |
932 | ||
933 | gfs2_glock_put(gl); | |
934 | ||
935 | if (gh) { | |
936 | if (test_bit(HIF_DEALLOC, &gh->gh_iflags)) | |
937 | gfs2_holder_put(gh); | |
938 | else | |
939 | complete(&gh->gh_wait); | |
940 | } | |
941 | } | |
942 | ||
943 | /** | |
944 | * gfs2_glock_xmote_th - Call into the lock module to acquire or change a glock | |
945 | * @gl: The glock in question | |
946 | * @state: the requested state | |
947 | * @flags: modifier flags to the lock call | |
948 | * | |
949 | */ | |
950 | ||
951 | void gfs2_glock_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags) | |
952 | { | |
953 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 954 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
955 | int lck_flags = flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB | |
956 | LM_FLAG_NOEXP | LM_FLAG_ANY | | |
957 | LM_FLAG_PRIORITY); | |
958 | unsigned int lck_ret; | |
959 | ||
960 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
961 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
962 | gfs2_assert_warn(sdp, state != LM_ST_UNLOCKED); | |
963 | gfs2_assert_warn(sdp, state != gl->gl_state); | |
964 | ||
50299965 SW |
965 | if (gl->gl_state == LM_ST_EXCLUSIVE && glops->go_sync) |
966 | glops->go_sync(gl, DIO_METADATA | DIO_DATA | DIO_RELEASE); | |
b3b94faa DT |
967 | |
968 | gfs2_glock_hold(gl); | |
969 | gl->gl_req_bh = xmote_bh; | |
970 | ||
ec45d9f5 | 971 | lck_ret = gfs2_lm_lock(sdp, gl->gl_lock, gl->gl_state, state, lck_flags); |
b3b94faa DT |
972 | |
973 | if (gfs2_assert_withdraw(sdp, !(lck_ret & LM_OUT_ERROR))) | |
974 | return; | |
975 | ||
976 | if (lck_ret & LM_OUT_ASYNC) | |
977 | gfs2_assert_warn(sdp, lck_ret == LM_OUT_ASYNC); | |
978 | else | |
979 | xmote_bh(gl, lck_ret); | |
980 | } | |
981 | ||
982 | /** | |
983 | * drop_bh - Called after a lock module unlock completes | |
984 | * @gl: the glock | |
985 | * @ret: the return status | |
986 | * | |
987 | * Doesn't wake up the process waiting on the struct gfs2_holder (if any) | |
988 | * Doesn't drop the reference on the glock the top half took out | |
989 | * | |
990 | */ | |
991 | ||
992 | static void drop_bh(struct gfs2_glock *gl, unsigned int ret) | |
993 | { | |
994 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 995 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
996 | struct gfs2_holder *gh = gl->gl_req_gh; |
997 | ||
998 | clear_bit(GLF_PREFETCH, &gl->gl_flags); | |
999 | ||
1000 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
1001 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
1002 | gfs2_assert_warn(sdp, !ret); | |
1003 | ||
1004 | state_change(gl, LM_ST_UNLOCKED); | |
1005 | ||
1006 | if (glops->go_inval) | |
1007 | glops->go_inval(gl, DIO_METADATA | DIO_DATA); | |
1008 | ||
1009 | if (gh) { | |
1010 | spin_lock(&gl->gl_spin); | |
1011 | list_del_init(&gh->gh_list); | |
1012 | gh->gh_error = 0; | |
1013 | spin_unlock(&gl->gl_spin); | |
1014 | } | |
1015 | ||
1016 | if (glops->go_drop_bh) | |
1017 | glops->go_drop_bh(gl); | |
1018 | ||
1019 | spin_lock(&gl->gl_spin); | |
1020 | gl->gl_req_gh = NULL; | |
1021 | gl->gl_req_bh = NULL; | |
1022 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
1023 | run_queue(gl); | |
1024 | spin_unlock(&gl->gl_spin); | |
1025 | ||
1026 | gfs2_glock_put(gl); | |
1027 | ||
1028 | if (gh) { | |
1029 | if (test_bit(HIF_DEALLOC, &gh->gh_iflags)) | |
1030 | gfs2_holder_put(gh); | |
1031 | else | |
1032 | complete(&gh->gh_wait); | |
1033 | } | |
1034 | } | |
1035 | ||
1036 | /** | |
1037 | * gfs2_glock_drop_th - call into the lock module to unlock a lock | |
1038 | * @gl: the glock | |
1039 | * | |
1040 | */ | |
1041 | ||
1042 | void gfs2_glock_drop_th(struct gfs2_glock *gl) | |
1043 | { | |
1044 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 1045 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
1046 | unsigned int ret; |
1047 | ||
1048 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
1049 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
1050 | gfs2_assert_warn(sdp, gl->gl_state != LM_ST_UNLOCKED); | |
1051 | ||
50299965 SW |
1052 | if (gl->gl_state == LM_ST_EXCLUSIVE && glops->go_sync) |
1053 | glops->go_sync(gl, DIO_METADATA | DIO_DATA | DIO_RELEASE); | |
b3b94faa DT |
1054 | |
1055 | gfs2_glock_hold(gl); | |
1056 | gl->gl_req_bh = drop_bh; | |
1057 | ||
b3b94faa DT |
1058 | ret = gfs2_lm_unlock(sdp, gl->gl_lock, gl->gl_state); |
1059 | ||
1060 | if (gfs2_assert_withdraw(sdp, !(ret & LM_OUT_ERROR))) | |
1061 | return; | |
1062 | ||
1063 | if (!ret) | |
1064 | drop_bh(gl, ret); | |
1065 | else | |
1066 | gfs2_assert_warn(sdp, ret == LM_OUT_ASYNC); | |
1067 | } | |
1068 | ||
1069 | /** | |
1070 | * do_cancels - cancel requests for locks stuck waiting on an expire flag | |
1071 | * @gh: the LM_FLAG_PRIORITY holder waiting to acquire the lock | |
1072 | * | |
1073 | * Don't cancel GL_NOCANCEL requests. | |
1074 | */ | |
1075 | ||
1076 | static void do_cancels(struct gfs2_holder *gh) | |
1077 | { | |
1078 | struct gfs2_glock *gl = gh->gh_gl; | |
1079 | ||
1080 | spin_lock(&gl->gl_spin); | |
1081 | ||
1082 | while (gl->gl_req_gh != gh && | |
1083 | !test_bit(HIF_HOLDER, &gh->gh_iflags) && | |
1084 | !list_empty(&gh->gh_list)) { | |
50299965 SW |
1085 | if (gl->gl_req_bh && !(gl->gl_req_gh && |
1086 | (gl->gl_req_gh->gh_flags & GL_NOCANCEL))) { | |
b3b94faa DT |
1087 | spin_unlock(&gl->gl_spin); |
1088 | gfs2_lm_cancel(gl->gl_sbd, gl->gl_lock); | |
1089 | msleep(100); | |
1090 | spin_lock(&gl->gl_spin); | |
1091 | } else { | |
1092 | spin_unlock(&gl->gl_spin); | |
1093 | msleep(100); | |
1094 | spin_lock(&gl->gl_spin); | |
1095 | } | |
1096 | } | |
1097 | ||
1098 | spin_unlock(&gl->gl_spin); | |
1099 | } | |
1100 | ||
1101 | /** | |
1102 | * glock_wait_internal - wait on a glock acquisition | |
1103 | * @gh: the glock holder | |
1104 | * | |
1105 | * Returns: 0 on success | |
1106 | */ | |
1107 | ||
1108 | static int glock_wait_internal(struct gfs2_holder *gh) | |
1109 | { | |
1110 | struct gfs2_glock *gl = gh->gh_gl; | |
1111 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 1112 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
1113 | |
1114 | if (test_bit(HIF_ABORTED, &gh->gh_iflags)) | |
1115 | return -EIO; | |
1116 | ||
1117 | if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { | |
1118 | spin_lock(&gl->gl_spin); | |
1119 | if (gl->gl_req_gh != gh && | |
1120 | !test_bit(HIF_HOLDER, &gh->gh_iflags) && | |
1121 | !list_empty(&gh->gh_list)) { | |
1122 | list_del_init(&gh->gh_list); | |
1123 | gh->gh_error = GLR_TRYFAILED; | |
b3b94faa DT |
1124 | run_queue(gl); |
1125 | spin_unlock(&gl->gl_spin); | |
1126 | return gh->gh_error; | |
1127 | } | |
1128 | spin_unlock(&gl->gl_spin); | |
1129 | } | |
1130 | ||
1131 | if (gh->gh_flags & LM_FLAG_PRIORITY) | |
1132 | do_cancels(gh); | |
1133 | ||
1134 | wait_for_completion(&gh->gh_wait); | |
1135 | ||
1136 | if (gh->gh_error) | |
1137 | return gh->gh_error; | |
1138 | ||
1139 | gfs2_assert_withdraw(sdp, test_bit(HIF_HOLDER, &gh->gh_iflags)); | |
85d1da67 | 1140 | gfs2_assert_withdraw(sdp, relaxed_state_ok(gl->gl_state, gh->gh_state, |
b3b94faa DT |
1141 | gh->gh_flags)); |
1142 | ||
1143 | if (test_bit(HIF_FIRST, &gh->gh_iflags)) { | |
1144 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
1145 | ||
1146 | if (glops->go_lock) { | |
1147 | gh->gh_error = glops->go_lock(gh); | |
1148 | if (gh->gh_error) { | |
1149 | spin_lock(&gl->gl_spin); | |
1150 | list_del_init(&gh->gh_list); | |
b3b94faa DT |
1151 | spin_unlock(&gl->gl_spin); |
1152 | } | |
1153 | } | |
1154 | ||
1155 | spin_lock(&gl->gl_spin); | |
1156 | gl->gl_req_gh = NULL; | |
1157 | gl->gl_req_bh = NULL; | |
1158 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
b3b94faa DT |
1159 | run_queue(gl); |
1160 | spin_unlock(&gl->gl_spin); | |
1161 | } | |
1162 | ||
1163 | return gh->gh_error; | |
1164 | } | |
1165 | ||
1166 | static inline struct gfs2_holder * | |
1167 | find_holder_by_owner(struct list_head *head, struct task_struct *owner) | |
1168 | { | |
1169 | struct gfs2_holder *gh; | |
1170 | ||
1171 | list_for_each_entry(gh, head, gh_list) { | |
1172 | if (gh->gh_owner == owner) | |
1173 | return gh; | |
1174 | } | |
1175 | ||
1176 | return NULL; | |
1177 | } | |
1178 | ||
b3b94faa DT |
1179 | /** |
1180 | * add_to_queue - Add a holder to the wait queue (but look for recursion) | |
1181 | * @gh: the holder structure to add | |
1182 | * | |
1183 | */ | |
1184 | ||
1185 | static void add_to_queue(struct gfs2_holder *gh) | |
1186 | { | |
1187 | struct gfs2_glock *gl = gh->gh_gl; | |
1188 | struct gfs2_holder *existing; | |
1189 | ||
190562bd SW |
1190 | BUG_ON(!gh->gh_owner); |
1191 | ||
b3b94faa DT |
1192 | existing = find_holder_by_owner(&gl->gl_holders, gh->gh_owner); |
1193 | if (existing) { | |
5965b1f4 | 1194 | print_symbol(KERN_WARNING "original: %s\n", existing->gh_ip); |
86384605 AD |
1195 | printk(KERN_INFO "pid : %d\n", existing->gh_owner->pid); |
1196 | printk(KERN_INFO "lock type : %d lock state : %d\n", | |
1197 | existing->gh_gl->gl_name.ln_type, existing->gh_gl->gl_state); | |
5965b1f4 | 1198 | print_symbol(KERN_WARNING "new: %s\n", gh->gh_ip); |
86384605 AD |
1199 | printk(KERN_INFO "pid : %d\n", gh->gh_owner->pid); |
1200 | printk(KERN_INFO "lock type : %d lock state : %d\n", | |
1201 | gl->gl_name.ln_type, gl->gl_state); | |
5965b1f4 | 1202 | BUG(); |
b3b94faa DT |
1203 | } |
1204 | ||
1205 | existing = find_holder_by_owner(&gl->gl_waiters3, gh->gh_owner); | |
1206 | if (existing) { | |
5965b1f4 SW |
1207 | print_symbol(KERN_WARNING "original: %s\n", existing->gh_ip); |
1208 | print_symbol(KERN_WARNING "new: %s\n", gh->gh_ip); | |
1209 | BUG(); | |
b3b94faa DT |
1210 | } |
1211 | ||
b3b94faa DT |
1212 | if (gh->gh_flags & LM_FLAG_PRIORITY) |
1213 | list_add(&gh->gh_list, &gl->gl_waiters3); | |
1214 | else | |
1215 | list_add_tail(&gh->gh_list, &gl->gl_waiters3); | |
1216 | } | |
1217 | ||
1218 | /** | |
1219 | * gfs2_glock_nq - enqueue a struct gfs2_holder onto a glock (acquire a glock) | |
1220 | * @gh: the holder structure | |
1221 | * | |
1222 | * if (gh->gh_flags & GL_ASYNC), this never returns an error | |
1223 | * | |
1224 | * Returns: 0, GLR_TRYFAILED, or errno on failure | |
1225 | */ | |
1226 | ||
1227 | int gfs2_glock_nq(struct gfs2_holder *gh) | |
1228 | { | |
1229 | struct gfs2_glock *gl = gh->gh_gl; | |
1230 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1231 | int error = 0; | |
1232 | ||
320dd101 | 1233 | restart: |
b3b94faa DT |
1234 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) { |
1235 | set_bit(HIF_ABORTED, &gh->gh_iflags); | |
1236 | return -EIO; | |
1237 | } | |
1238 | ||
1239 | set_bit(HIF_PROMOTE, &gh->gh_iflags); | |
1240 | ||
1241 | spin_lock(&gl->gl_spin); | |
1242 | add_to_queue(gh); | |
1243 | run_queue(gl); | |
1244 | spin_unlock(&gl->gl_spin); | |
1245 | ||
1246 | if (!(gh->gh_flags & GL_ASYNC)) { | |
1247 | error = glock_wait_internal(gh); | |
1248 | if (error == GLR_CANCELED) { | |
190562bd | 1249 | msleep(100); |
b3b94faa DT |
1250 | goto restart; |
1251 | } | |
1252 | } | |
1253 | ||
1254 | clear_bit(GLF_PREFETCH, &gl->gl_flags); | |
1255 | ||
320dd101 SW |
1256 | if (error == GLR_TRYFAILED && (gh->gh_flags & GL_DUMP)) |
1257 | dump_glock(gl); | |
1258 | ||
b3b94faa DT |
1259 | return error; |
1260 | } | |
1261 | ||
1262 | /** | |
1263 | * gfs2_glock_poll - poll to see if an async request has been completed | |
1264 | * @gh: the holder | |
1265 | * | |
1266 | * Returns: 1 if the request is ready to be gfs2_glock_wait()ed on | |
1267 | */ | |
1268 | ||
1269 | int gfs2_glock_poll(struct gfs2_holder *gh) | |
1270 | { | |
1271 | struct gfs2_glock *gl = gh->gh_gl; | |
1272 | int ready = 0; | |
1273 | ||
1274 | spin_lock(&gl->gl_spin); | |
1275 | ||
1276 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
1277 | ready = 1; | |
1278 | else if (list_empty(&gh->gh_list)) { | |
1279 | if (gh->gh_error == GLR_CANCELED) { | |
1280 | spin_unlock(&gl->gl_spin); | |
190562bd | 1281 | msleep(100); |
b3b94faa DT |
1282 | if (gfs2_glock_nq(gh)) |
1283 | return 1; | |
1284 | return 0; | |
1285 | } else | |
1286 | ready = 1; | |
1287 | } | |
1288 | ||
1289 | spin_unlock(&gl->gl_spin); | |
1290 | ||
1291 | return ready; | |
1292 | } | |
1293 | ||
1294 | /** | |
1295 | * gfs2_glock_wait - wait for a lock acquisition that ended in a GLR_ASYNC | |
1296 | * @gh: the holder structure | |
1297 | * | |
1298 | * Returns: 0, GLR_TRYFAILED, or errno on failure | |
1299 | */ | |
1300 | ||
1301 | int gfs2_glock_wait(struct gfs2_holder *gh) | |
1302 | { | |
1303 | int error; | |
1304 | ||
1305 | error = glock_wait_internal(gh); | |
1306 | if (error == GLR_CANCELED) { | |
190562bd | 1307 | msleep(100); |
b3b94faa DT |
1308 | gh->gh_flags &= ~GL_ASYNC; |
1309 | error = gfs2_glock_nq(gh); | |
1310 | } | |
1311 | ||
1312 | return error; | |
1313 | } | |
1314 | ||
1315 | /** | |
1316 | * gfs2_glock_dq - dequeue a struct gfs2_holder from a glock (release a glock) | |
1317 | * @gh: the glock holder | |
1318 | * | |
1319 | */ | |
1320 | ||
1321 | void gfs2_glock_dq(struct gfs2_holder *gh) | |
1322 | { | |
1323 | struct gfs2_glock *gl = gh->gh_gl; | |
8fb4b536 | 1324 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa | 1325 | |
b3b94faa DT |
1326 | if (gh->gh_flags & GL_NOCACHE) |
1327 | handle_callback(gl, LM_ST_UNLOCKED); | |
1328 | ||
1329 | gfs2_glmutex_lock(gl); | |
1330 | ||
1331 | spin_lock(&gl->gl_spin); | |
1332 | list_del_init(&gh->gh_list); | |
1333 | ||
1334 | if (list_empty(&gl->gl_holders)) { | |
1335 | spin_unlock(&gl->gl_spin); | |
1336 | ||
1337 | if (glops->go_unlock) | |
1338 | glops->go_unlock(gh); | |
1339 | ||
b3b94faa DT |
1340 | gl->gl_stamp = jiffies; |
1341 | ||
1342 | spin_lock(&gl->gl_spin); | |
1343 | } | |
1344 | ||
1345 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
1346 | run_queue(gl); | |
1347 | spin_unlock(&gl->gl_spin); | |
1348 | } | |
1349 | ||
1350 | /** | |
1351 | * gfs2_glock_prefetch - Try to prefetch a glock | |
1352 | * @gl: the glock | |
1353 | * @state: the state to prefetch in | |
1354 | * @flags: flags passed to go_xmote_th() | |
1355 | * | |
1356 | */ | |
1357 | ||
08bc2dbc AB |
1358 | static void gfs2_glock_prefetch(struct gfs2_glock *gl, unsigned int state, |
1359 | int flags) | |
b3b94faa | 1360 | { |
8fb4b536 | 1361 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
1362 | |
1363 | spin_lock(&gl->gl_spin); | |
1364 | ||
50299965 SW |
1365 | if (test_bit(GLF_LOCK, &gl->gl_flags) || !list_empty(&gl->gl_holders) || |
1366 | !list_empty(&gl->gl_waiters1) || !list_empty(&gl->gl_waiters2) || | |
b3b94faa DT |
1367 | !list_empty(&gl->gl_waiters3) || |
1368 | relaxed_state_ok(gl->gl_state, state, flags)) { | |
1369 | spin_unlock(&gl->gl_spin); | |
1370 | return; | |
1371 | } | |
1372 | ||
1373 | set_bit(GLF_PREFETCH, &gl->gl_flags); | |
1374 | set_bit(GLF_LOCK, &gl->gl_flags); | |
1375 | spin_unlock(&gl->gl_spin); | |
1376 | ||
1377 | glops->go_xmote_th(gl, state, flags); | |
b3b94faa DT |
1378 | } |
1379 | ||
b3b94faa DT |
1380 | static void greedy_work(void *data) |
1381 | { | |
e7f5c01c | 1382 | struct greedy *gr = data; |
b3b94faa DT |
1383 | struct gfs2_holder *gh = &gr->gr_gh; |
1384 | struct gfs2_glock *gl = gh->gh_gl; | |
8fb4b536 | 1385 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
1386 | |
1387 | clear_bit(GLF_SKIP_WAITERS2, &gl->gl_flags); | |
1388 | ||
1389 | if (glops->go_greedy) | |
1390 | glops->go_greedy(gl); | |
1391 | ||
1392 | spin_lock(&gl->gl_spin); | |
1393 | ||
1394 | if (list_empty(&gl->gl_waiters2)) { | |
1395 | clear_bit(GLF_GREEDY, &gl->gl_flags); | |
1396 | spin_unlock(&gl->gl_spin); | |
1397 | gfs2_holder_uninit(gh); | |
1398 | kfree(gr); | |
1399 | } else { | |
1400 | gfs2_glock_hold(gl); | |
1401 | list_add_tail(&gh->gh_list, &gl->gl_waiters2); | |
1402 | run_queue(gl); | |
1403 | spin_unlock(&gl->gl_spin); | |
1404 | gfs2_glock_put(gl); | |
1405 | } | |
1406 | } | |
1407 | ||
1408 | /** | |
1409 | * gfs2_glock_be_greedy - | |
1410 | * @gl: | |
1411 | * @time: | |
1412 | * | |
1413 | * Returns: 0 if go_greedy will be called, 1 otherwise | |
1414 | */ | |
1415 | ||
1416 | int gfs2_glock_be_greedy(struct gfs2_glock *gl, unsigned int time) | |
1417 | { | |
1418 | struct greedy *gr; | |
1419 | struct gfs2_holder *gh; | |
1420 | ||
feaa7bba | 1421 | if (!time || gl->gl_sbd->sd_args.ar_localcaching || |
b3b94faa DT |
1422 | test_and_set_bit(GLF_GREEDY, &gl->gl_flags)) |
1423 | return 1; | |
1424 | ||
1425 | gr = kmalloc(sizeof(struct greedy), GFP_KERNEL); | |
1426 | if (!gr) { | |
1427 | clear_bit(GLF_GREEDY, &gl->gl_flags); | |
1428 | return 1; | |
1429 | } | |
1430 | gh = &gr->gr_gh; | |
1431 | ||
579b78a4 | 1432 | gfs2_holder_init(gl, 0, 0, gh); |
b3b94faa DT |
1433 | set_bit(HIF_GREEDY, &gh->gh_iflags); |
1434 | INIT_WORK(&gr->gr_work, greedy_work, gr); | |
1435 | ||
1436 | set_bit(GLF_SKIP_WAITERS2, &gl->gl_flags); | |
1437 | schedule_delayed_work(&gr->gr_work, time); | |
1438 | ||
1439 | return 0; | |
1440 | } | |
1441 | ||
b3b94faa DT |
1442 | /** |
1443 | * gfs2_glock_dq_uninit - dequeue a holder from a glock and initialize it | |
1444 | * @gh: the holder structure | |
1445 | * | |
1446 | */ | |
1447 | ||
1448 | void gfs2_glock_dq_uninit(struct gfs2_holder *gh) | |
1449 | { | |
1450 | gfs2_glock_dq(gh); | |
1451 | gfs2_holder_uninit(gh); | |
1452 | } | |
1453 | ||
1454 | /** | |
1455 | * gfs2_glock_nq_num - acquire a glock based on lock number | |
1456 | * @sdp: the filesystem | |
1457 | * @number: the lock number | |
1458 | * @glops: the glock operations for the type of glock | |
1459 | * @state: the state to acquire the glock in | |
1460 | * @flags: modifier flags for the aquisition | |
1461 | * @gh: the struct gfs2_holder | |
1462 | * | |
1463 | * Returns: errno | |
1464 | */ | |
1465 | ||
cd915493 | 1466 | int gfs2_glock_nq_num(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 SW |
1467 | const struct gfs2_glock_operations *glops, |
1468 | unsigned int state, int flags, struct gfs2_holder *gh) | |
b3b94faa DT |
1469 | { |
1470 | struct gfs2_glock *gl; | |
1471 | int error; | |
1472 | ||
1473 | error = gfs2_glock_get(sdp, number, glops, CREATE, &gl); | |
1474 | if (!error) { | |
1475 | error = gfs2_glock_nq_init(gl, state, flags, gh); | |
1476 | gfs2_glock_put(gl); | |
1477 | } | |
1478 | ||
1479 | return error; | |
1480 | } | |
1481 | ||
1482 | /** | |
1483 | * glock_compare - Compare two struct gfs2_glock structures for sorting | |
1484 | * @arg_a: the first structure | |
1485 | * @arg_b: the second structure | |
1486 | * | |
1487 | */ | |
1488 | ||
1489 | static int glock_compare(const void *arg_a, const void *arg_b) | |
1490 | { | |
a5e08a9e SW |
1491 | const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a; |
1492 | const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b; | |
1493 | const struct lm_lockname *a = &gh_a->gh_gl->gl_name; | |
1494 | const struct lm_lockname *b = &gh_b->gh_gl->gl_name; | |
b3b94faa DT |
1495 | |
1496 | if (a->ln_number > b->ln_number) | |
a5e08a9e SW |
1497 | return 1; |
1498 | if (a->ln_number < b->ln_number) | |
1499 | return -1; | |
1500 | if (gh_a->gh_state == LM_ST_SHARED && gh_b->gh_state == LM_ST_EXCLUSIVE) | |
1501 | return 1; | |
1502 | if (!(gh_a->gh_flags & GL_LOCAL_EXCL) && (gh_b->gh_flags & GL_LOCAL_EXCL)) | |
1503 | return 1; | |
1504 | return 0; | |
b3b94faa DT |
1505 | } |
1506 | ||
1507 | /** | |
1508 | * nq_m_sync - synchonously acquire more than one glock in deadlock free order | |
1509 | * @num_gh: the number of structures | |
1510 | * @ghs: an array of struct gfs2_holder structures | |
1511 | * | |
1512 | * Returns: 0 on success (all glocks acquired), | |
1513 | * errno on failure (no glocks acquired) | |
1514 | */ | |
1515 | ||
1516 | static int nq_m_sync(unsigned int num_gh, struct gfs2_holder *ghs, | |
1517 | struct gfs2_holder **p) | |
1518 | { | |
1519 | unsigned int x; | |
1520 | int error = 0; | |
1521 | ||
1522 | for (x = 0; x < num_gh; x++) | |
1523 | p[x] = &ghs[x]; | |
1524 | ||
1525 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare, NULL); | |
1526 | ||
1527 | for (x = 0; x < num_gh; x++) { | |
1528 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1529 | ||
1530 | error = gfs2_glock_nq(p[x]); | |
1531 | if (error) { | |
1532 | while (x--) | |
1533 | gfs2_glock_dq(p[x]); | |
1534 | break; | |
1535 | } | |
1536 | } | |
1537 | ||
1538 | return error; | |
1539 | } | |
1540 | ||
1541 | /** | |
1542 | * gfs2_glock_nq_m - acquire multiple glocks | |
1543 | * @num_gh: the number of structures | |
1544 | * @ghs: an array of struct gfs2_holder structures | |
1545 | * | |
1546 | * Figure out how big an impact this function has. Either: | |
1547 | * 1) Replace this code with code that calls gfs2_glock_prefetch() | |
1548 | * 2) Forget async stuff and just call nq_m_sync() | |
1549 | * 3) Leave it like it is | |
1550 | * | |
1551 | * Returns: 0 on success (all glocks acquired), | |
1552 | * errno on failure (no glocks acquired) | |
1553 | */ | |
1554 | ||
1555 | int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1556 | { | |
1557 | int *e; | |
1558 | unsigned int x; | |
1559 | int borked = 0, serious = 0; | |
1560 | int error = 0; | |
1561 | ||
1562 | if (!num_gh) | |
1563 | return 0; | |
1564 | ||
1565 | if (num_gh == 1) { | |
1566 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1567 | return gfs2_glock_nq(ghs); | |
1568 | } | |
1569 | ||
1570 | e = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL); | |
1571 | if (!e) | |
1572 | return -ENOMEM; | |
1573 | ||
1574 | for (x = 0; x < num_gh; x++) { | |
1575 | ghs[x].gh_flags |= LM_FLAG_TRY | GL_ASYNC; | |
1576 | error = gfs2_glock_nq(&ghs[x]); | |
1577 | if (error) { | |
1578 | borked = 1; | |
1579 | serious = error; | |
1580 | num_gh = x; | |
1581 | break; | |
1582 | } | |
1583 | } | |
1584 | ||
1585 | for (x = 0; x < num_gh; x++) { | |
1586 | error = e[x] = glock_wait_internal(&ghs[x]); | |
1587 | if (error) { | |
1588 | borked = 1; | |
1589 | if (error != GLR_TRYFAILED && error != GLR_CANCELED) | |
1590 | serious = error; | |
1591 | } | |
1592 | } | |
1593 | ||
1594 | if (!borked) { | |
1595 | kfree(e); | |
1596 | return 0; | |
1597 | } | |
1598 | ||
1599 | for (x = 0; x < num_gh; x++) | |
1600 | if (!e[x]) | |
1601 | gfs2_glock_dq(&ghs[x]); | |
1602 | ||
1603 | if (serious) | |
1604 | error = serious; | |
1605 | else { | |
1606 | for (x = 0; x < num_gh; x++) | |
1607 | gfs2_holder_reinit(ghs[x].gh_state, ghs[x].gh_flags, | |
1608 | &ghs[x]); | |
1609 | error = nq_m_sync(num_gh, ghs, (struct gfs2_holder **)e); | |
1610 | } | |
1611 | ||
1612 | kfree(e); | |
1613 | ||
1614 | return error; | |
1615 | } | |
1616 | ||
1617 | /** | |
1618 | * gfs2_glock_dq_m - release multiple glocks | |
1619 | * @num_gh: the number of structures | |
1620 | * @ghs: an array of struct gfs2_holder structures | |
1621 | * | |
1622 | */ | |
1623 | ||
1624 | void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1625 | { | |
1626 | unsigned int x; | |
1627 | ||
1628 | for (x = 0; x < num_gh; x++) | |
1629 | gfs2_glock_dq(&ghs[x]); | |
1630 | } | |
1631 | ||
1632 | /** | |
1633 | * gfs2_glock_dq_uninit_m - release multiple glocks | |
1634 | * @num_gh: the number of structures | |
1635 | * @ghs: an array of struct gfs2_holder structures | |
1636 | * | |
1637 | */ | |
1638 | ||
1639 | void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1640 | { | |
1641 | unsigned int x; | |
1642 | ||
1643 | for (x = 0; x < num_gh; x++) | |
1644 | gfs2_glock_dq_uninit(&ghs[x]); | |
1645 | } | |
1646 | ||
1647 | /** | |
1648 | * gfs2_glock_prefetch_num - prefetch a glock based on lock number | |
1649 | * @sdp: the filesystem | |
1650 | * @number: the lock number | |
1651 | * @glops: the glock operations for the type of glock | |
1652 | * @state: the state to acquire the glock in | |
1653 | * @flags: modifier flags for the aquisition | |
1654 | * | |
1655 | * Returns: errno | |
1656 | */ | |
1657 | ||
cd915493 | 1658 | void gfs2_glock_prefetch_num(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 | 1659 | const struct gfs2_glock_operations *glops, |
b3b94faa DT |
1660 | unsigned int state, int flags) |
1661 | { | |
1662 | struct gfs2_glock *gl; | |
1663 | int error; | |
1664 | ||
1665 | if (atomic_read(&sdp->sd_reclaim_count) < | |
1666 | gfs2_tune_get(sdp, gt_reclaim_limit)) { | |
1667 | error = gfs2_glock_get(sdp, number, glops, CREATE, &gl); | |
1668 | if (!error) { | |
1669 | gfs2_glock_prefetch(gl, state, flags); | |
1670 | gfs2_glock_put(gl); | |
1671 | } | |
1672 | } | |
1673 | } | |
1674 | ||
1675 | /** | |
1676 | * gfs2_lvb_hold - attach a LVB from a glock | |
1677 | * @gl: The glock in question | |
1678 | * | |
1679 | */ | |
1680 | ||
1681 | int gfs2_lvb_hold(struct gfs2_glock *gl) | |
1682 | { | |
1683 | int error; | |
1684 | ||
1685 | gfs2_glmutex_lock(gl); | |
1686 | ||
1687 | if (!atomic_read(&gl->gl_lvb_count)) { | |
1688 | error = gfs2_lm_hold_lvb(gl->gl_sbd, gl->gl_lock, &gl->gl_lvb); | |
1689 | if (error) { | |
1690 | gfs2_glmutex_unlock(gl); | |
1691 | return error; | |
1692 | } | |
1693 | gfs2_glock_hold(gl); | |
1694 | } | |
1695 | atomic_inc(&gl->gl_lvb_count); | |
1696 | ||
1697 | gfs2_glmutex_unlock(gl); | |
1698 | ||
1699 | return 0; | |
1700 | } | |
1701 | ||
1702 | /** | |
1703 | * gfs2_lvb_unhold - detach a LVB from a glock | |
1704 | * @gl: The glock in question | |
1705 | * | |
1706 | */ | |
1707 | ||
1708 | void gfs2_lvb_unhold(struct gfs2_glock *gl) | |
1709 | { | |
1710 | gfs2_glock_hold(gl); | |
1711 | gfs2_glmutex_lock(gl); | |
1712 | ||
1713 | gfs2_assert(gl->gl_sbd, atomic_read(&gl->gl_lvb_count) > 0); | |
1714 | if (atomic_dec_and_test(&gl->gl_lvb_count)) { | |
1715 | gfs2_lm_unhold_lvb(gl->gl_sbd, gl->gl_lock, gl->gl_lvb); | |
1716 | gl->gl_lvb = NULL; | |
1717 | gfs2_glock_put(gl); | |
1718 | } | |
1719 | ||
1720 | gfs2_glmutex_unlock(gl); | |
1721 | gfs2_glock_put(gl); | |
1722 | } | |
1723 | ||
b3b94faa DT |
1724 | static void blocking_cb(struct gfs2_sbd *sdp, struct lm_lockname *name, |
1725 | unsigned int state) | |
1726 | { | |
1727 | struct gfs2_glock *gl; | |
1728 | ||
1729 | gl = gfs2_glock_find(sdp, name); | |
1730 | if (!gl) | |
1731 | return; | |
1732 | ||
1733 | if (gl->gl_ops->go_callback) | |
1734 | gl->gl_ops->go_callback(gl, state); | |
1735 | handle_callback(gl, state); | |
1736 | ||
1737 | spin_lock(&gl->gl_spin); | |
1738 | run_queue(gl); | |
1739 | spin_unlock(&gl->gl_spin); | |
1740 | ||
1741 | gfs2_glock_put(gl); | |
1742 | } | |
1743 | ||
1744 | /** | |
1745 | * gfs2_glock_cb - Callback used by locking module | |
1c089c32 | 1746 | * @sdp: Pointer to the superblock |
b3b94faa DT |
1747 | * @type: Type of callback |
1748 | * @data: Type dependent data pointer | |
1749 | * | |
1750 | * Called by the locking module when it wants to tell us something. | |
1751 | * Either we need to drop a lock, one of our ASYNC requests completed, or | |
1752 | * a journal from another client needs to be recovered. | |
1753 | */ | |
1754 | ||
9b47c11d | 1755 | void gfs2_glock_cb(void *cb_data, unsigned int type, void *data) |
b3b94faa | 1756 | { |
9b47c11d | 1757 | struct gfs2_sbd *sdp = cb_data; |
b3b94faa | 1758 | |
b3b94faa DT |
1759 | switch (type) { |
1760 | case LM_CB_NEED_E: | |
e7f5c01c | 1761 | blocking_cb(sdp, data, LM_ST_UNLOCKED); |
b3b94faa DT |
1762 | return; |
1763 | ||
1764 | case LM_CB_NEED_D: | |
e7f5c01c | 1765 | blocking_cb(sdp, data, LM_ST_DEFERRED); |
b3b94faa DT |
1766 | return; |
1767 | ||
1768 | case LM_CB_NEED_S: | |
e7f5c01c | 1769 | blocking_cb(sdp, data, LM_ST_SHARED); |
b3b94faa DT |
1770 | return; |
1771 | ||
1772 | case LM_CB_ASYNC: { | |
e7f5c01c | 1773 | struct lm_async_cb *async = data; |
b3b94faa DT |
1774 | struct gfs2_glock *gl; |
1775 | ||
1776 | gl = gfs2_glock_find(sdp, &async->lc_name); | |
1777 | if (gfs2_assert_warn(sdp, gl)) | |
1778 | return; | |
1779 | if (!gfs2_assert_warn(sdp, gl->gl_req_bh)) | |
1780 | gl->gl_req_bh(gl, async->lc_ret); | |
1781 | gfs2_glock_put(gl); | |
b3b94faa DT |
1782 | return; |
1783 | } | |
1784 | ||
1785 | case LM_CB_NEED_RECOVERY: | |
1786 | gfs2_jdesc_make_dirty(sdp, *(unsigned int *)data); | |
1787 | if (sdp->sd_recoverd_process) | |
1788 | wake_up_process(sdp->sd_recoverd_process); | |
1789 | return; | |
1790 | ||
1791 | case LM_CB_DROPLOCKS: | |
1792 | gfs2_gl_hash_clear(sdp, NO_WAIT); | |
1793 | gfs2_quota_scan(sdp); | |
1794 | return; | |
1795 | ||
1796 | default: | |
1797 | gfs2_assert_warn(sdp, 0); | |
1798 | return; | |
1799 | } | |
1800 | } | |
1801 | ||
b3b94faa DT |
1802 | /** |
1803 | * demote_ok - Check to see if it's ok to unlock a glock | |
1804 | * @gl: the glock | |
1805 | * | |
1806 | * Returns: 1 if it's ok | |
1807 | */ | |
1808 | ||
1809 | static int demote_ok(struct gfs2_glock *gl) | |
1810 | { | |
1811 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 1812 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
1813 | int demote = 1; |
1814 | ||
1815 | if (test_bit(GLF_STICKY, &gl->gl_flags)) | |
1816 | demote = 0; | |
1817 | else if (test_bit(GLF_PREFETCH, &gl->gl_flags)) | |
50299965 | 1818 | demote = time_after_eq(jiffies, gl->gl_stamp + |
b3b94faa DT |
1819 | gfs2_tune_get(sdp, gt_prefetch_secs) * HZ); |
1820 | else if (glops->go_demote_ok) | |
1821 | demote = glops->go_demote_ok(gl); | |
1822 | ||
1823 | return demote; | |
1824 | } | |
1825 | ||
1826 | /** | |
1827 | * gfs2_glock_schedule_for_reclaim - Add a glock to the reclaim list | |
1828 | * @gl: the glock | |
1829 | * | |
1830 | */ | |
1831 | ||
1832 | void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl) | |
1833 | { | |
1834 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1835 | ||
1836 | spin_lock(&sdp->sd_reclaim_lock); | |
1837 | if (list_empty(&gl->gl_reclaim)) { | |
1838 | gfs2_glock_hold(gl); | |
1839 | list_add(&gl->gl_reclaim, &sdp->sd_reclaim_list); | |
1840 | atomic_inc(&sdp->sd_reclaim_count); | |
1841 | } | |
1842 | spin_unlock(&sdp->sd_reclaim_lock); | |
1843 | ||
1844 | wake_up(&sdp->sd_reclaim_wq); | |
1845 | } | |
1846 | ||
1847 | /** | |
1848 | * gfs2_reclaim_glock - process the next glock on the filesystem's reclaim list | |
1849 | * @sdp: the filesystem | |
1850 | * | |
1851 | * Called from gfs2_glockd() glock reclaim daemon, or when promoting a | |
1852 | * different glock and we notice that there are a lot of glocks in the | |
1853 | * reclaim list. | |
1854 | * | |
1855 | */ | |
1856 | ||
1857 | void gfs2_reclaim_glock(struct gfs2_sbd *sdp) | |
1858 | { | |
1859 | struct gfs2_glock *gl; | |
1860 | ||
1861 | spin_lock(&sdp->sd_reclaim_lock); | |
1862 | if (list_empty(&sdp->sd_reclaim_list)) { | |
1863 | spin_unlock(&sdp->sd_reclaim_lock); | |
1864 | return; | |
1865 | } | |
1866 | gl = list_entry(sdp->sd_reclaim_list.next, | |
1867 | struct gfs2_glock, gl_reclaim); | |
1868 | list_del_init(&gl->gl_reclaim); | |
1869 | spin_unlock(&sdp->sd_reclaim_lock); | |
1870 | ||
1871 | atomic_dec(&sdp->sd_reclaim_count); | |
1872 | atomic_inc(&sdp->sd_reclaimed); | |
1873 | ||
1874 | if (gfs2_glmutex_trylock(gl)) { | |
b3b94faa | 1875 | if (queue_empty(gl, &gl->gl_holders) && |
50299965 | 1876 | gl->gl_state != LM_ST_UNLOCKED && demote_ok(gl)) |
b3b94faa DT |
1877 | handle_callback(gl, LM_ST_UNLOCKED); |
1878 | gfs2_glmutex_unlock(gl); | |
1879 | } | |
1880 | ||
1881 | gfs2_glock_put(gl); | |
1882 | } | |
1883 | ||
1884 | /** | |
1885 | * examine_bucket - Call a function for glock in a hash bucket | |
1886 | * @examiner: the function | |
1887 | * @sdp: the filesystem | |
1888 | * @bucket: the bucket | |
1889 | * | |
1890 | * Returns: 1 if the bucket has entries | |
1891 | */ | |
1892 | ||
1893 | static int examine_bucket(glock_examiner examiner, struct gfs2_sbd *sdp, | |
37b2fa6a | 1894 | unsigned int hash) |
b3b94faa | 1895 | { |
24264434 SW |
1896 | struct gfs2_glock *gl, *prev = NULL; |
1897 | int has_entries = 0; | |
1898 | struct list_head *head = &gl_hash_table[hash].hb_list; | |
b3b94faa | 1899 | |
24264434 SW |
1900 | read_lock(gl_lock_addr(hash)); |
1901 | /* Can't use list_for_each_entry - don't want prefetch here */ | |
1902 | if (list_empty(head)) | |
1903 | goto out; | |
1904 | has_entries = 1; | |
1905 | gl = list_entry(head->next, struct gfs2_glock, gl_list); | |
1906 | while(&gl->gl_list != head) { | |
1907 | if (gl->gl_sbd == sdp) { | |
b3b94faa | 1908 | gfs2_glock_hold(gl); |
24264434 SW |
1909 | read_unlock(gl_lock_addr(hash)); |
1910 | if (prev) | |
1911 | gfs2_glock_put(prev); | |
1912 | prev = gl; | |
1913 | examiner(gl); | |
1914 | read_lock(gl_lock_addr(hash)); | |
b3b94faa | 1915 | } |
24264434 | 1916 | gl = list_entry(gl->gl_list.next, struct gfs2_glock, gl_list); |
b3b94faa | 1917 | } |
24264434 SW |
1918 | out: |
1919 | read_unlock(gl_lock_addr(hash)); | |
1920 | if (prev) | |
1921 | gfs2_glock_put(prev); | |
1922 | return has_entries; | |
b3b94faa DT |
1923 | } |
1924 | ||
1925 | /** | |
1926 | * scan_glock - look at a glock and see if we can reclaim it | |
1927 | * @gl: the glock to look at | |
1928 | * | |
1929 | */ | |
1930 | ||
1931 | static void scan_glock(struct gfs2_glock *gl) | |
1932 | { | |
a2242db0 | 1933 | if (gl->gl_ops == &gfs2_inode_glops) |
24264434 | 1934 | return; |
a2242db0 | 1935 | |
b3b94faa | 1936 | if (gfs2_glmutex_trylock(gl)) { |
b3b94faa | 1937 | if (queue_empty(gl, &gl->gl_holders) && |
24264434 | 1938 | gl->gl_state != LM_ST_UNLOCKED && demote_ok(gl)) |
b3b94faa | 1939 | goto out_schedule; |
b3b94faa DT |
1940 | gfs2_glmutex_unlock(gl); |
1941 | } | |
b3b94faa DT |
1942 | return; |
1943 | ||
627add2d | 1944 | out_schedule: |
b3b94faa DT |
1945 | gfs2_glmutex_unlock(gl); |
1946 | gfs2_glock_schedule_for_reclaim(gl); | |
b3b94faa DT |
1947 | } |
1948 | ||
1949 | /** | |
1950 | * gfs2_scand_internal - Look for glocks and inodes to toss from memory | |
1951 | * @sdp: the filesystem | |
1952 | * | |
1953 | */ | |
1954 | ||
1955 | void gfs2_scand_internal(struct gfs2_sbd *sdp) | |
1956 | { | |
1957 | unsigned int x; | |
1958 | ||
94610610 | 1959 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) |
37b2fa6a | 1960 | examine_bucket(scan_glock, sdp, x); |
b3b94faa DT |
1961 | } |
1962 | ||
1963 | /** | |
1964 | * clear_glock - look at a glock and see if we can free it from glock cache | |
1965 | * @gl: the glock to look at | |
1966 | * | |
1967 | */ | |
1968 | ||
1969 | static void clear_glock(struct gfs2_glock *gl) | |
1970 | { | |
1971 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1972 | int released; | |
1973 | ||
1974 | spin_lock(&sdp->sd_reclaim_lock); | |
1975 | if (!list_empty(&gl->gl_reclaim)) { | |
1976 | list_del_init(&gl->gl_reclaim); | |
1977 | atomic_dec(&sdp->sd_reclaim_count); | |
190562bd | 1978 | spin_unlock(&sdp->sd_reclaim_lock); |
b3b94faa DT |
1979 | released = gfs2_glock_put(gl); |
1980 | gfs2_assert(sdp, !released); | |
190562bd SW |
1981 | } else { |
1982 | spin_unlock(&sdp->sd_reclaim_lock); | |
b3b94faa | 1983 | } |
b3b94faa DT |
1984 | |
1985 | if (gfs2_glmutex_trylock(gl)) { | |
b3b94faa DT |
1986 | if (queue_empty(gl, &gl->gl_holders) && |
1987 | gl->gl_state != LM_ST_UNLOCKED) | |
1988 | handle_callback(gl, LM_ST_UNLOCKED); | |
b3b94faa DT |
1989 | gfs2_glmutex_unlock(gl); |
1990 | } | |
b3b94faa DT |
1991 | } |
1992 | ||
1993 | /** | |
1994 | * gfs2_gl_hash_clear - Empty out the glock hash table | |
1995 | * @sdp: the filesystem | |
1996 | * @wait: wait until it's all gone | |
1997 | * | |
1998 | * Called when unmounting the filesystem, or when inter-node lock manager | |
1999 | * requests DROPLOCKS because it is running out of capacity. | |
2000 | */ | |
2001 | ||
2002 | void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait) | |
2003 | { | |
2004 | unsigned long t; | |
2005 | unsigned int x; | |
2006 | int cont; | |
2007 | ||
2008 | t = jiffies; | |
2009 | ||
2010 | for (;;) { | |
2011 | cont = 0; | |
24264434 SW |
2012 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) { |
2013 | if (examine_bucket(clear_glock, sdp, x)) | |
b3b94faa | 2014 | cont = 1; |
24264434 | 2015 | } |
b3b94faa DT |
2016 | |
2017 | if (!wait || !cont) | |
2018 | break; | |
2019 | ||
2020 | if (time_after_eq(jiffies, | |
2021 | t + gfs2_tune_get(sdp, gt_stall_secs) * HZ)) { | |
2022 | fs_warn(sdp, "Unmount seems to be stalled. " | |
2023 | "Dumping lock state...\n"); | |
2024 | gfs2_dump_lockstate(sdp); | |
2025 | t = jiffies; | |
2026 | } | |
2027 | ||
b3b94faa | 2028 | invalidate_inodes(sdp->sd_vfs); |
fd88de56 | 2029 | msleep(10); |
b3b94faa DT |
2030 | } |
2031 | } | |
2032 | ||
2033 | /* | |
2034 | * Diagnostic routines to help debug distributed deadlock | |
2035 | */ | |
2036 | ||
2037 | /** | |
2038 | * dump_holder - print information about a glock holder | |
2039 | * @str: a string naming the type of holder | |
2040 | * @gh: the glock holder | |
2041 | * | |
2042 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
2043 | */ | |
2044 | ||
2045 | static int dump_holder(char *str, struct gfs2_holder *gh) | |
2046 | { | |
2047 | unsigned int x; | |
2048 | int error = -ENOBUFS; | |
2049 | ||
d92a8d48 SW |
2050 | printk(KERN_INFO " %s\n", str); |
2051 | printk(KERN_INFO " owner = %ld\n", | |
b3b94faa | 2052 | (gh->gh_owner) ? (long)gh->gh_owner->pid : -1); |
d92a8d48 SW |
2053 | printk(KERN_INFO " gh_state = %u\n", gh->gh_state); |
2054 | printk(KERN_INFO " gh_flags ="); | |
b3b94faa DT |
2055 | for (x = 0; x < 32; x++) |
2056 | if (gh->gh_flags & (1 << x)) | |
2057 | printk(" %u", x); | |
2058 | printk(" \n"); | |
d92a8d48 SW |
2059 | printk(KERN_INFO " error = %d\n", gh->gh_error); |
2060 | printk(KERN_INFO " gh_iflags ="); | |
b3b94faa DT |
2061 | for (x = 0; x < 32; x++) |
2062 | if (test_bit(x, &gh->gh_iflags)) | |
2063 | printk(" %u", x); | |
2064 | printk(" \n"); | |
d0dc80db | 2065 | print_symbol(KERN_INFO " initialized at: %s\n", gh->gh_ip); |
b3b94faa DT |
2066 | |
2067 | error = 0; | |
2068 | ||
2069 | return error; | |
2070 | } | |
2071 | ||
2072 | /** | |
2073 | * dump_inode - print information about an inode | |
2074 | * @ip: the inode | |
2075 | * | |
2076 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
2077 | */ | |
2078 | ||
2079 | static int dump_inode(struct gfs2_inode *ip) | |
2080 | { | |
2081 | unsigned int x; | |
2082 | int error = -ENOBUFS; | |
2083 | ||
d92a8d48 SW |
2084 | printk(KERN_INFO " Inode:\n"); |
2085 | printk(KERN_INFO " num = %llu %llu\n", | |
382066da SW |
2086 | (unsigned long long)ip->i_num.no_formal_ino, |
2087 | (unsigned long long)ip->i_num.no_addr); | |
d92a8d48 | 2088 | printk(KERN_INFO " type = %u\n", IF2DT(ip->i_di.di_mode)); |
d92a8d48 | 2089 | printk(KERN_INFO " i_flags ="); |
b3b94faa DT |
2090 | for (x = 0; x < 32; x++) |
2091 | if (test_bit(x, &ip->i_flags)) | |
2092 | printk(" %u", x); | |
2093 | printk(" \n"); | |
b3b94faa DT |
2094 | |
2095 | error = 0; | |
2096 | ||
2097 | return error; | |
2098 | } | |
2099 | ||
2100 | /** | |
2101 | * dump_glock - print information about a glock | |
2102 | * @gl: the glock | |
2103 | * @count: where we are in the buffer | |
2104 | * | |
2105 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
2106 | */ | |
2107 | ||
2108 | static int dump_glock(struct gfs2_glock *gl) | |
2109 | { | |
2110 | struct gfs2_holder *gh; | |
2111 | unsigned int x; | |
2112 | int error = -ENOBUFS; | |
2113 | ||
2114 | spin_lock(&gl->gl_spin); | |
2115 | ||
85d1da67 | 2116 | printk(KERN_INFO "Glock 0x%p (%u, %llu)\n", gl, gl->gl_name.ln_type, |
382066da | 2117 | (unsigned long long)gl->gl_name.ln_number); |
d92a8d48 | 2118 | printk(KERN_INFO " gl_flags ="); |
85d1da67 | 2119 | for (x = 0; x < 32; x++) { |
b3b94faa DT |
2120 | if (test_bit(x, &gl->gl_flags)) |
2121 | printk(" %u", x); | |
85d1da67 | 2122 | } |
b3b94faa | 2123 | printk(" \n"); |
d92a8d48 SW |
2124 | printk(KERN_INFO " gl_ref = %d\n", atomic_read(&gl->gl_ref.refcount)); |
2125 | printk(KERN_INFO " gl_state = %u\n", gl->gl_state); | |
320dd101 SW |
2126 | printk(KERN_INFO " gl_owner = %s\n", gl->gl_owner->comm); |
2127 | print_symbol(KERN_INFO " gl_ip = %s\n", gl->gl_ip); | |
d92a8d48 SW |
2128 | printk(KERN_INFO " req_gh = %s\n", (gl->gl_req_gh) ? "yes" : "no"); |
2129 | printk(KERN_INFO " req_bh = %s\n", (gl->gl_req_bh) ? "yes" : "no"); | |
2130 | printk(KERN_INFO " lvb_count = %d\n", atomic_read(&gl->gl_lvb_count)); | |
2131 | printk(KERN_INFO " object = %s\n", (gl->gl_object) ? "yes" : "no"); | |
2132 | printk(KERN_INFO " le = %s\n", | |
b3b94faa | 2133 | (list_empty(&gl->gl_le.le_list)) ? "no" : "yes"); |
d92a8d48 | 2134 | printk(KERN_INFO " reclaim = %s\n", |
b3b94faa DT |
2135 | (list_empty(&gl->gl_reclaim)) ? "no" : "yes"); |
2136 | if (gl->gl_aspace) | |
85d1da67 | 2137 | printk(KERN_INFO " aspace = 0x%p nrpages = %lu\n", gl->gl_aspace, |
88721877 | 2138 | gl->gl_aspace->i_mapping->nrpages); |
b3b94faa | 2139 | else |
d92a8d48 SW |
2140 | printk(KERN_INFO " aspace = no\n"); |
2141 | printk(KERN_INFO " ail = %d\n", atomic_read(&gl->gl_ail_count)); | |
b3b94faa DT |
2142 | if (gl->gl_req_gh) { |
2143 | error = dump_holder("Request", gl->gl_req_gh); | |
2144 | if (error) | |
2145 | goto out; | |
2146 | } | |
2147 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
2148 | error = dump_holder("Holder", gh); | |
2149 | if (error) | |
2150 | goto out; | |
2151 | } | |
2152 | list_for_each_entry(gh, &gl->gl_waiters1, gh_list) { | |
2153 | error = dump_holder("Waiter1", gh); | |
2154 | if (error) | |
2155 | goto out; | |
2156 | } | |
2157 | list_for_each_entry(gh, &gl->gl_waiters2, gh_list) { | |
2158 | error = dump_holder("Waiter2", gh); | |
2159 | if (error) | |
2160 | goto out; | |
2161 | } | |
2162 | list_for_each_entry(gh, &gl->gl_waiters3, gh_list) { | |
2163 | error = dump_holder("Waiter3", gh); | |
2164 | if (error) | |
2165 | goto out; | |
2166 | } | |
5c676f6d | 2167 | if (gl->gl_ops == &gfs2_inode_glops && gl->gl_object) { |
b3b94faa DT |
2168 | if (!test_bit(GLF_LOCK, &gl->gl_flags) && |
2169 | list_empty(&gl->gl_holders)) { | |
5c676f6d | 2170 | error = dump_inode(gl->gl_object); |
b3b94faa DT |
2171 | if (error) |
2172 | goto out; | |
2173 | } else { | |
2174 | error = -ENOBUFS; | |
d92a8d48 | 2175 | printk(KERN_INFO " Inode: busy\n"); |
b3b94faa DT |
2176 | } |
2177 | } | |
2178 | ||
2179 | error = 0; | |
2180 | ||
a91ea69f | 2181 | out: |
b3b94faa | 2182 | spin_unlock(&gl->gl_spin); |
b3b94faa DT |
2183 | return error; |
2184 | } | |
2185 | ||
2186 | /** | |
2187 | * gfs2_dump_lockstate - print out the current lockstate | |
2188 | * @sdp: the filesystem | |
2189 | * @ub: the buffer to copy the information into | |
2190 | * | |
2191 | * If @ub is NULL, dump the lockstate to the console. | |
2192 | * | |
2193 | */ | |
2194 | ||
08bc2dbc | 2195 | static int gfs2_dump_lockstate(struct gfs2_sbd *sdp) |
b3b94faa | 2196 | { |
b3b94faa DT |
2197 | struct gfs2_glock *gl; |
2198 | unsigned int x; | |
2199 | int error = 0; | |
2200 | ||
2201 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) { | |
b3b94faa | 2202 | |
087efdd3 | 2203 | read_lock(gl_lock_addr(x)); |
b3b94faa | 2204 | |
37b2fa6a | 2205 | list_for_each_entry(gl, &gl_hash_table[x].hb_list, gl_list) { |
85d1da67 SW |
2206 | if (gl->gl_sbd != sdp) |
2207 | continue; | |
b3b94faa DT |
2208 | |
2209 | error = dump_glock(gl); | |
2210 | if (error) | |
2211 | break; | |
2212 | } | |
2213 | ||
087efdd3 | 2214 | read_unlock(gl_lock_addr(x)); |
b3b94faa DT |
2215 | |
2216 | if (error) | |
2217 | break; | |
2218 | } | |
2219 | ||
2220 | ||
2221 | return error; | |
2222 | } | |
2223 | ||
85d1da67 SW |
2224 | int __init gfs2_glock_init(void) |
2225 | { | |
2226 | unsigned i; | |
2227 | for(i = 0; i < GFS2_GL_HASH_SIZE; i++) { | |
37b2fa6a | 2228 | INIT_LIST_HEAD(&gl_hash_table[i].hb_list); |
85d1da67 | 2229 | } |
087efdd3 SW |
2230 | #ifdef GL_HASH_LOCK_SZ |
2231 | for(i = 0; i < GL_HASH_LOCK_SZ; i++) { | |
2232 | rwlock_init(&gl_hash_locks[i]); | |
2233 | } | |
2234 | #endif | |
85d1da67 SW |
2235 | return 0; |
2236 | } | |
2237 |