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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> | |
d0dc80db | 18 | #include <linux/kallsyms.h> |
5c676f6d | 19 | #include <linux/gfs2_ondisk.h> |
24264434 | 20 | #include <linux/list.h> |
7d308590 | 21 | #include <linux/lm_interface.h> |
b3b94faa DT |
22 | #include <asm/uaccess.h> |
23 | ||
24 | #include "gfs2.h" | |
5c676f6d | 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 | 35 | |
b3b94faa DT |
36 | struct greedy { |
37 | struct gfs2_holder gr_gh; | |
c4028958 | 38 | struct delayed_work gr_work; |
b3b94faa DT |
39 | }; |
40 | ||
37b2fa6a | 41 | struct gfs2_gl_hash_bucket { |
b6397893 | 42 | struct hlist_head hb_list; |
37b2fa6a SW |
43 | }; |
44 | ||
b3b94faa DT |
45 | typedef void (*glock_examiner) (struct gfs2_glock * gl); |
46 | ||
08bc2dbc | 47 | static int gfs2_dump_lockstate(struct gfs2_sbd *sdp); |
320dd101 | 48 | static int dump_glock(struct gfs2_glock *gl); |
24264434 | 49 | static int dump_inode(struct gfs2_inode *ip); |
08bc2dbc | 50 | |
b6397893 | 51 | #define GFS2_GL_HASH_SHIFT 15 |
087efdd3 SW |
52 | #define GFS2_GL_HASH_SIZE (1 << GFS2_GL_HASH_SHIFT) |
53 | #define GFS2_GL_HASH_MASK (GFS2_GL_HASH_SIZE - 1) | |
54 | ||
85d1da67 | 55 | static struct gfs2_gl_hash_bucket gl_hash_table[GFS2_GL_HASH_SIZE]; |
087efdd3 SW |
56 | |
57 | /* | |
58 | * Despite what you might think, the numbers below are not arbitrary :-) | |
59 | * They are taken from the ipv4 routing hash code, which is well tested | |
60 | * and thus should be nearly optimal. Later on we might tweek the numbers | |
61 | * but for now this should be fine. | |
62 | * | |
63 | * The reason for putting the locks in a separate array from the list heads | |
64 | * is that we can have fewer locks than list heads and save memory. We use | |
65 | * the same hash function for both, but with a different hash mask. | |
66 | */ | |
67 | #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) || \ | |
68 | defined(CONFIG_PROVE_LOCKING) | |
69 | ||
70 | #ifdef CONFIG_LOCKDEP | |
71 | # define GL_HASH_LOCK_SZ 256 | |
72 | #else | |
73 | # if NR_CPUS >= 32 | |
74 | # define GL_HASH_LOCK_SZ 4096 | |
75 | # elif NR_CPUS >= 16 | |
76 | # define GL_HASH_LOCK_SZ 2048 | |
77 | # elif NR_CPUS >= 8 | |
78 | # define GL_HASH_LOCK_SZ 1024 | |
79 | # elif NR_CPUS >= 4 | |
80 | # define GL_HASH_LOCK_SZ 512 | |
81 | # else | |
82 | # define GL_HASH_LOCK_SZ 256 | |
83 | # endif | |
84 | #endif | |
85 | ||
86 | /* We never want more locks than chains */ | |
87 | #if GFS2_GL_HASH_SIZE < GL_HASH_LOCK_SZ | |
88 | # undef GL_HASH_LOCK_SZ | |
89 | # define GL_HASH_LOCK_SZ GFS2_GL_HASH_SIZE | |
90 | #endif | |
91 | ||
92 | static rwlock_t gl_hash_locks[GL_HASH_LOCK_SZ]; | |
93 | ||
94 | static inline rwlock_t *gl_lock_addr(unsigned int x) | |
95 | { | |
94610610 | 96 | return &gl_hash_locks[x & (GL_HASH_LOCK_SZ-1)]; |
087efdd3 SW |
97 | } |
98 | #else /* not SMP, so no spinlocks required */ | |
0ac23069 | 99 | static inline rwlock_t *gl_lock_addr(unsigned int x) |
087efdd3 SW |
100 | { |
101 | return NULL; | |
102 | } | |
103 | #endif | |
85d1da67 | 104 | |
b3b94faa DT |
105 | /** |
106 | * relaxed_state_ok - is a requested lock compatible with the current lock mode? | |
107 | * @actual: the current state of the lock | |
108 | * @requested: the lock state that was requested by the caller | |
109 | * @flags: the modifier flags passed in by the caller | |
110 | * | |
111 | * Returns: 1 if the locks are compatible, 0 otherwise | |
112 | */ | |
113 | ||
114 | static inline int relaxed_state_ok(unsigned int actual, unsigned requested, | |
115 | int flags) | |
116 | { | |
117 | if (actual == requested) | |
118 | return 1; | |
119 | ||
120 | if (flags & GL_EXACT) | |
121 | return 0; | |
122 | ||
123 | if (actual == LM_ST_EXCLUSIVE && requested == LM_ST_SHARED) | |
124 | return 1; | |
125 | ||
126 | if (actual != LM_ST_UNLOCKED && (flags & LM_FLAG_ANY)) | |
127 | return 1; | |
128 | ||
129 | return 0; | |
130 | } | |
131 | ||
132 | /** | |
133 | * gl_hash() - Turn glock number into hash bucket number | |
134 | * @lock: The glock number | |
135 | * | |
136 | * Returns: The number of the corresponding hash bucket | |
137 | */ | |
138 | ||
b8547856 SW |
139 | static unsigned int gl_hash(const struct gfs2_sbd *sdp, |
140 | const struct lm_lockname *name) | |
b3b94faa DT |
141 | { |
142 | unsigned int h; | |
143 | ||
cd915493 | 144 | h = jhash(&name->ln_number, sizeof(u64), 0); |
b3b94faa | 145 | h = jhash(&name->ln_type, sizeof(unsigned int), h); |
b8547856 | 146 | h = jhash(&sdp, sizeof(struct gfs2_sbd *), h); |
b3b94faa DT |
147 | h &= GFS2_GL_HASH_MASK; |
148 | ||
149 | return h; | |
150 | } | |
151 | ||
152 | /** | |
153 | * glock_free() - Perform a few checks and then release struct gfs2_glock | |
154 | * @gl: The glock to release | |
155 | * | |
156 | * Also calls lock module to release its internal structure for this glock. | |
157 | * | |
158 | */ | |
159 | ||
160 | static void glock_free(struct gfs2_glock *gl) | |
161 | { | |
162 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
163 | struct inode *aspace = gl->gl_aspace; | |
164 | ||
165 | gfs2_lm_put_lock(sdp, gl->gl_lock); | |
166 | ||
167 | if (aspace) | |
168 | gfs2_aspace_put(aspace); | |
169 | ||
170 | kmem_cache_free(gfs2_glock_cachep, gl); | |
b3b94faa DT |
171 | } |
172 | ||
173 | /** | |
174 | * gfs2_glock_hold() - increment reference count on glock | |
175 | * @gl: The glock to hold | |
176 | * | |
177 | */ | |
178 | ||
179 | void gfs2_glock_hold(struct gfs2_glock *gl) | |
180 | { | |
16feb9fe | 181 | atomic_inc(&gl->gl_ref); |
b3b94faa DT |
182 | } |
183 | ||
184 | /** | |
185 | * gfs2_glock_put() - Decrement reference count on glock | |
186 | * @gl: The glock to put | |
187 | * | |
188 | */ | |
189 | ||
190 | int gfs2_glock_put(struct gfs2_glock *gl) | |
191 | { | |
b3b94faa | 192 | int rv = 0; |
16feb9fe | 193 | struct gfs2_sbd *sdp = gl->gl_sbd; |
b3b94faa | 194 | |
087efdd3 | 195 | write_lock(gl_lock_addr(gl->gl_hash)); |
16feb9fe | 196 | if (atomic_dec_and_test(&gl->gl_ref)) { |
b6397893 | 197 | hlist_del(&gl->gl_list); |
087efdd3 | 198 | write_unlock(gl_lock_addr(gl->gl_hash)); |
190562bd | 199 | BUG_ON(spin_is_locked(&gl->gl_spin)); |
16feb9fe SW |
200 | gfs2_assert(sdp, gl->gl_state == LM_ST_UNLOCKED); |
201 | gfs2_assert(sdp, list_empty(&gl->gl_reclaim)); | |
202 | gfs2_assert(sdp, list_empty(&gl->gl_holders)); | |
203 | gfs2_assert(sdp, list_empty(&gl->gl_waiters1)); | |
204 | gfs2_assert(sdp, list_empty(&gl->gl_waiters2)); | |
205 | gfs2_assert(sdp, list_empty(&gl->gl_waiters3)); | |
b3b94faa DT |
206 | glock_free(gl); |
207 | rv = 1; | |
208 | goto out; | |
209 | } | |
087efdd3 | 210 | write_unlock(gl_lock_addr(gl->gl_hash)); |
a2242db0 | 211 | out: |
b3b94faa DT |
212 | return rv; |
213 | } | |
214 | ||
215 | /** | |
216 | * queue_empty - check to see if a glock's queue is empty | |
217 | * @gl: the glock | |
218 | * @head: the head of the queue to check | |
219 | * | |
220 | * This function protects the list in the event that a process already | |
221 | * has a holder on the list and is adding a second holder for itself. | |
222 | * The glmutex lock is what generally prevents processes from working | |
223 | * on the same glock at once, but the special case of adding a second | |
224 | * holder for yourself ("recursive" locking) doesn't involve locking | |
225 | * glmutex, making the spin lock necessary. | |
226 | * | |
227 | * Returns: 1 if the queue is empty | |
228 | */ | |
229 | ||
230 | static inline int queue_empty(struct gfs2_glock *gl, struct list_head *head) | |
231 | { | |
232 | int empty; | |
233 | spin_lock(&gl->gl_spin); | |
234 | empty = list_empty(head); | |
235 | spin_unlock(&gl->gl_spin); | |
236 | return empty; | |
237 | } | |
238 | ||
239 | /** | |
240 | * search_bucket() - Find struct gfs2_glock by lock number | |
241 | * @bucket: the bucket to search | |
242 | * @name: The lock name | |
243 | * | |
244 | * Returns: NULL, or the struct gfs2_glock with the requested number | |
245 | */ | |
246 | ||
37b2fa6a | 247 | static struct gfs2_glock *search_bucket(unsigned int hash, |
899be4d3 | 248 | const struct gfs2_sbd *sdp, |
d6a53727 | 249 | const struct lm_lockname *name) |
b3b94faa DT |
250 | { |
251 | struct gfs2_glock *gl; | |
b6397893 | 252 | struct hlist_node *h; |
b3b94faa | 253 | |
b6397893 | 254 | hlist_for_each_entry(gl, h, &gl_hash_table[hash].hb_list, gl_list) { |
b3b94faa DT |
255 | if (!lm_name_equal(&gl->gl_name, name)) |
256 | continue; | |
899be4d3 SW |
257 | if (gl->gl_sbd != sdp) |
258 | continue; | |
b3b94faa | 259 | |
16feb9fe | 260 | atomic_inc(&gl->gl_ref); |
b3b94faa DT |
261 | |
262 | return gl; | |
263 | } | |
264 | ||
265 | return NULL; | |
266 | } | |
267 | ||
268 | /** | |
269 | * gfs2_glock_find() - Find glock by lock number | |
270 | * @sdp: The GFS2 superblock | |
271 | * @name: The lock name | |
272 | * | |
273 | * Returns: NULL, or the struct gfs2_glock with the requested number | |
274 | */ | |
275 | ||
85d1da67 | 276 | static struct gfs2_glock *gfs2_glock_find(const struct gfs2_sbd *sdp, |
d6a53727 | 277 | const struct lm_lockname *name) |
b3b94faa | 278 | { |
37b2fa6a | 279 | unsigned int hash = gl_hash(sdp, name); |
b3b94faa DT |
280 | struct gfs2_glock *gl; |
281 | ||
087efdd3 | 282 | read_lock(gl_lock_addr(hash)); |
37b2fa6a | 283 | gl = search_bucket(hash, sdp, name); |
087efdd3 | 284 | read_unlock(gl_lock_addr(hash)); |
b3b94faa DT |
285 | |
286 | return gl; | |
287 | } | |
288 | ||
289 | /** | |
290 | * gfs2_glock_get() - Get a glock, or create one if one doesn't exist | |
291 | * @sdp: The GFS2 superblock | |
292 | * @number: the lock number | |
293 | * @glops: The glock_operations to use | |
294 | * @create: If 0, don't create the glock if it doesn't exist | |
295 | * @glp: the glock is returned here | |
296 | * | |
297 | * This does not lock a glock, just finds/creates structures for one. | |
298 | * | |
299 | * Returns: errno | |
300 | */ | |
301 | ||
cd915493 | 302 | int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 | 303 | const struct gfs2_glock_operations *glops, int create, |
b3b94faa DT |
304 | struct gfs2_glock **glp) |
305 | { | |
37b2fa6a | 306 | struct lm_lockname name = { .ln_number = number, .ln_type = glops->go_type }; |
b3b94faa | 307 | struct gfs2_glock *gl, *tmp; |
37b2fa6a | 308 | unsigned int hash = gl_hash(sdp, &name); |
b3b94faa DT |
309 | int error; |
310 | ||
087efdd3 | 311 | read_lock(gl_lock_addr(hash)); |
37b2fa6a | 312 | gl = search_bucket(hash, sdp, &name); |
087efdd3 | 313 | read_unlock(gl_lock_addr(hash)); |
b3b94faa DT |
314 | |
315 | if (gl || !create) { | |
316 | *glp = gl; | |
317 | return 0; | |
318 | } | |
319 | ||
320 | gl = kmem_cache_alloc(gfs2_glock_cachep, GFP_KERNEL); | |
321 | if (!gl) | |
322 | return -ENOMEM; | |
323 | ||
ec45d9f5 | 324 | gl->gl_flags = 0; |
b3b94faa | 325 | gl->gl_name = name; |
16feb9fe | 326 | atomic_set(&gl->gl_ref, 1); |
b3b94faa | 327 | gl->gl_state = LM_ST_UNLOCKED; |
37b2fa6a | 328 | gl->gl_hash = hash; |
320dd101 SW |
329 | gl->gl_owner = NULL; |
330 | gl->gl_ip = 0; | |
b3b94faa | 331 | gl->gl_ops = glops; |
ec45d9f5 SW |
332 | gl->gl_req_gh = NULL; |
333 | gl->gl_req_bh = NULL; | |
334 | gl->gl_vn = 0; | |
335 | gl->gl_stamp = jiffies; | |
336 | gl->gl_object = NULL; | |
b3b94faa | 337 | gl->gl_sbd = sdp; |
ec45d9f5 | 338 | gl->gl_aspace = NULL; |
b3b94faa | 339 | lops_init_le(&gl->gl_le, &gfs2_glock_lops); |
b3b94faa DT |
340 | |
341 | /* If this glock protects actual on-disk data or metadata blocks, | |
342 | create a VFS inode to manage the pages/buffers holding them. */ | |
50299965 | 343 | if (glops == &gfs2_inode_glops || glops == &gfs2_rgrp_glops) { |
b3b94faa DT |
344 | gl->gl_aspace = gfs2_aspace_get(sdp); |
345 | if (!gl->gl_aspace) { | |
346 | error = -ENOMEM; | |
347 | goto fail; | |
348 | } | |
349 | } | |
350 | ||
351 | error = gfs2_lm_get_lock(sdp, &name, &gl->gl_lock); | |
352 | if (error) | |
353 | goto fail_aspace; | |
354 | ||
087efdd3 | 355 | write_lock(gl_lock_addr(hash)); |
37b2fa6a | 356 | tmp = search_bucket(hash, sdp, &name); |
b3b94faa | 357 | if (tmp) { |
087efdd3 | 358 | write_unlock(gl_lock_addr(hash)); |
b3b94faa DT |
359 | glock_free(gl); |
360 | gl = tmp; | |
361 | } else { | |
b6397893 | 362 | hlist_add_head(&gl->gl_list, &gl_hash_table[hash].hb_list); |
087efdd3 | 363 | write_unlock(gl_lock_addr(hash)); |
b3b94faa DT |
364 | } |
365 | ||
366 | *glp = gl; | |
367 | ||
368 | return 0; | |
369 | ||
ec45d9f5 | 370 | fail_aspace: |
b3b94faa DT |
371 | if (gl->gl_aspace) |
372 | gfs2_aspace_put(gl->gl_aspace); | |
ec45d9f5 | 373 | fail: |
907b9bce | 374 | kmem_cache_free(gfs2_glock_cachep, gl); |
b3b94faa DT |
375 | return error; |
376 | } | |
377 | ||
378 | /** | |
379 | * gfs2_holder_init - initialize a struct gfs2_holder in the default way | |
380 | * @gl: the glock | |
381 | * @state: the state we're requesting | |
382 | * @flags: the modifier flags | |
383 | * @gh: the holder structure | |
384 | * | |
385 | */ | |
386 | ||
190562bd | 387 | void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags, |
b3b94faa DT |
388 | struct gfs2_holder *gh) |
389 | { | |
390 | INIT_LIST_HEAD(&gh->gh_list); | |
391 | gh->gh_gl = gl; | |
d0dc80db | 392 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
190562bd | 393 | gh->gh_owner = current; |
b3b94faa DT |
394 | gh->gh_state = state; |
395 | gh->gh_flags = flags; | |
396 | gh->gh_error = 0; | |
397 | gh->gh_iflags = 0; | |
398 | init_completion(&gh->gh_wait); | |
399 | ||
400 | if (gh->gh_state == LM_ST_EXCLUSIVE) | |
401 | gh->gh_flags |= GL_LOCAL_EXCL; | |
402 | ||
403 | gfs2_glock_hold(gl); | |
404 | } | |
405 | ||
406 | /** | |
407 | * gfs2_holder_reinit - reinitialize a struct gfs2_holder so we can requeue it | |
408 | * @state: the state we're requesting | |
409 | * @flags: the modifier flags | |
410 | * @gh: the holder structure | |
411 | * | |
412 | * Don't mess with the glock. | |
413 | * | |
414 | */ | |
415 | ||
190562bd | 416 | void gfs2_holder_reinit(unsigned int state, unsigned flags, struct gfs2_holder *gh) |
b3b94faa DT |
417 | { |
418 | gh->gh_state = state; | |
579b78a4 | 419 | gh->gh_flags = flags; |
b3b94faa DT |
420 | if (gh->gh_state == LM_ST_EXCLUSIVE) |
421 | gh->gh_flags |= GL_LOCAL_EXCL; | |
422 | ||
423 | gh->gh_iflags &= 1 << HIF_ALLOCED; | |
d0dc80db | 424 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
b3b94faa DT |
425 | } |
426 | ||
427 | /** | |
428 | * gfs2_holder_uninit - uninitialize a holder structure (drop glock reference) | |
429 | * @gh: the holder structure | |
430 | * | |
431 | */ | |
432 | ||
433 | void gfs2_holder_uninit(struct gfs2_holder *gh) | |
434 | { | |
435 | gfs2_glock_put(gh->gh_gl); | |
436 | gh->gh_gl = NULL; | |
d0dc80db | 437 | gh->gh_ip = 0; |
b3b94faa DT |
438 | } |
439 | ||
440 | /** | |
441 | * gfs2_holder_get - get a struct gfs2_holder structure | |
442 | * @gl: the glock | |
443 | * @state: the state we're requesting | |
444 | * @flags: the modifier flags | |
af18ddb8 | 445 | * @gfp_flags: |
b3b94faa DT |
446 | * |
447 | * Figure out how big an impact this function has. Either: | |
448 | * 1) Replace it with a cache of structures hanging off the struct gfs2_sbd | |
449 | * 2) Leave it like it is | |
450 | * | |
451 | * Returns: the holder structure, NULL on ENOMEM | |
452 | */ | |
453 | ||
08bc2dbc AB |
454 | static struct gfs2_holder *gfs2_holder_get(struct gfs2_glock *gl, |
455 | unsigned int state, | |
456 | int flags, gfp_t gfp_flags) | |
b3b94faa DT |
457 | { |
458 | struct gfs2_holder *gh; | |
459 | ||
460 | gh = kmalloc(sizeof(struct gfs2_holder), gfp_flags); | |
461 | if (!gh) | |
462 | return NULL; | |
463 | ||
464 | gfs2_holder_init(gl, state, flags, gh); | |
465 | set_bit(HIF_ALLOCED, &gh->gh_iflags); | |
d0dc80db | 466 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
b3b94faa DT |
467 | return gh; |
468 | } | |
469 | ||
470 | /** | |
471 | * gfs2_holder_put - get rid of a struct gfs2_holder structure | |
472 | * @gh: the holder structure | |
473 | * | |
474 | */ | |
475 | ||
08bc2dbc | 476 | static void gfs2_holder_put(struct gfs2_holder *gh) |
b3b94faa DT |
477 | { |
478 | gfs2_holder_uninit(gh); | |
479 | kfree(gh); | |
480 | } | |
481 | ||
b3b94faa DT |
482 | /** |
483 | * rq_mutex - process a mutex request in the queue | |
484 | * @gh: the glock holder | |
485 | * | |
486 | * Returns: 1 if the queue is blocked | |
487 | */ | |
488 | ||
489 | static int rq_mutex(struct gfs2_holder *gh) | |
490 | { | |
491 | struct gfs2_glock *gl = gh->gh_gl; | |
492 | ||
493 | list_del_init(&gh->gh_list); | |
494 | /* gh->gh_error never examined. */ | |
495 | set_bit(GLF_LOCK, &gl->gl_flags); | |
496 | complete(&gh->gh_wait); | |
497 | ||
498 | return 1; | |
499 | } | |
500 | ||
501 | /** | |
502 | * rq_promote - process a promote request in the queue | |
503 | * @gh: the glock holder | |
504 | * | |
505 | * Acquire a new inter-node lock, or change a lock state to more restrictive. | |
506 | * | |
507 | * Returns: 1 if the queue is blocked | |
508 | */ | |
509 | ||
510 | static int rq_promote(struct gfs2_holder *gh) | |
511 | { | |
512 | struct gfs2_glock *gl = gh->gh_gl; | |
513 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 514 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
515 | |
516 | if (!relaxed_state_ok(gl->gl_state, gh->gh_state, gh->gh_flags)) { | |
517 | if (list_empty(&gl->gl_holders)) { | |
518 | gl->gl_req_gh = gh; | |
519 | set_bit(GLF_LOCK, &gl->gl_flags); | |
520 | spin_unlock(&gl->gl_spin); | |
521 | ||
522 | if (atomic_read(&sdp->sd_reclaim_count) > | |
523 | gfs2_tune_get(sdp, gt_reclaim_limit) && | |
524 | !(gh->gh_flags & LM_FLAG_PRIORITY)) { | |
525 | gfs2_reclaim_glock(sdp); | |
526 | gfs2_reclaim_glock(sdp); | |
527 | } | |
528 | ||
ec45d9f5 | 529 | glops->go_xmote_th(gl, gh->gh_state, gh->gh_flags); |
b3b94faa DT |
530 | spin_lock(&gl->gl_spin); |
531 | } | |
532 | return 1; | |
533 | } | |
534 | ||
535 | if (list_empty(&gl->gl_holders)) { | |
536 | set_bit(HIF_FIRST, &gh->gh_iflags); | |
537 | set_bit(GLF_LOCK, &gl->gl_flags); | |
b3b94faa DT |
538 | } else { |
539 | struct gfs2_holder *next_gh; | |
540 | if (gh->gh_flags & GL_LOCAL_EXCL) | |
541 | return 1; | |
542 | next_gh = list_entry(gl->gl_holders.next, struct gfs2_holder, | |
543 | gh_list); | |
544 | if (next_gh->gh_flags & GL_LOCAL_EXCL) | |
545 | return 1; | |
b3b94faa DT |
546 | } |
547 | ||
548 | list_move_tail(&gh->gh_list, &gl->gl_holders); | |
549 | gh->gh_error = 0; | |
550 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
551 | ||
b3b94faa DT |
552 | complete(&gh->gh_wait); |
553 | ||
554 | return 0; | |
555 | } | |
556 | ||
557 | /** | |
558 | * rq_demote - process a demote request in the queue | |
559 | * @gh: the glock holder | |
560 | * | |
561 | * Returns: 1 if the queue is blocked | |
562 | */ | |
563 | ||
564 | static int rq_demote(struct gfs2_holder *gh) | |
565 | { | |
566 | struct gfs2_glock *gl = gh->gh_gl; | |
8fb4b536 | 567 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
568 | |
569 | if (!list_empty(&gl->gl_holders)) | |
570 | return 1; | |
571 | ||
572 | if (gl->gl_state == gh->gh_state || gl->gl_state == LM_ST_UNLOCKED) { | |
573 | list_del_init(&gh->gh_list); | |
574 | gh->gh_error = 0; | |
575 | spin_unlock(&gl->gl_spin); | |
576 | if (test_bit(HIF_DEALLOC, &gh->gh_iflags)) | |
577 | gfs2_holder_put(gh); | |
578 | else | |
579 | complete(&gh->gh_wait); | |
580 | spin_lock(&gl->gl_spin); | |
581 | } else { | |
582 | gl->gl_req_gh = gh; | |
583 | set_bit(GLF_LOCK, &gl->gl_flags); | |
584 | spin_unlock(&gl->gl_spin); | |
585 | ||
586 | if (gh->gh_state == LM_ST_UNLOCKED || | |
587 | gl->gl_state != LM_ST_EXCLUSIVE) | |
588 | glops->go_drop_th(gl); | |
589 | else | |
590 | glops->go_xmote_th(gl, gh->gh_state, gh->gh_flags); | |
591 | ||
592 | spin_lock(&gl->gl_spin); | |
593 | } | |
594 | ||
595 | return 0; | |
596 | } | |
597 | ||
598 | /** | |
599 | * rq_greedy - process a queued request to drop greedy status | |
600 | * @gh: the glock holder | |
601 | * | |
602 | * Returns: 1 if the queue is blocked | |
603 | */ | |
604 | ||
605 | static int rq_greedy(struct gfs2_holder *gh) | |
606 | { | |
607 | struct gfs2_glock *gl = gh->gh_gl; | |
608 | ||
609 | list_del_init(&gh->gh_list); | |
610 | /* gh->gh_error never examined. */ | |
611 | clear_bit(GLF_GREEDY, &gl->gl_flags); | |
612 | spin_unlock(&gl->gl_spin); | |
613 | ||
614 | gfs2_holder_uninit(gh); | |
615 | kfree(container_of(gh, struct greedy, gr_gh)); | |
616 | ||
907b9bce | 617 | spin_lock(&gl->gl_spin); |
b3b94faa DT |
618 | |
619 | return 0; | |
620 | } | |
621 | ||
622 | /** | |
623 | * run_queue - process holder structures on a glock | |
624 | * @gl: the glock | |
625 | * | |
626 | */ | |
b3b94faa DT |
627 | static void run_queue(struct gfs2_glock *gl) |
628 | { | |
629 | struct gfs2_holder *gh; | |
630 | int blocked = 1; | |
631 | ||
632 | for (;;) { | |
633 | if (test_bit(GLF_LOCK, &gl->gl_flags)) | |
634 | break; | |
635 | ||
636 | if (!list_empty(&gl->gl_waiters1)) { | |
637 | gh = list_entry(gl->gl_waiters1.next, | |
638 | struct gfs2_holder, gh_list); | |
639 | ||
640 | if (test_bit(HIF_MUTEX, &gh->gh_iflags)) | |
641 | blocked = rq_mutex(gh); | |
642 | else | |
643 | gfs2_assert_warn(gl->gl_sbd, 0); | |
644 | ||
645 | } else if (!list_empty(&gl->gl_waiters2) && | |
646 | !test_bit(GLF_SKIP_WAITERS2, &gl->gl_flags)) { | |
647 | gh = list_entry(gl->gl_waiters2.next, | |
648 | struct gfs2_holder, gh_list); | |
649 | ||
650 | if (test_bit(HIF_DEMOTE, &gh->gh_iflags)) | |
651 | blocked = rq_demote(gh); | |
652 | else if (test_bit(HIF_GREEDY, &gh->gh_iflags)) | |
653 | blocked = rq_greedy(gh); | |
654 | else | |
655 | gfs2_assert_warn(gl->gl_sbd, 0); | |
656 | ||
657 | } else if (!list_empty(&gl->gl_waiters3)) { | |
658 | gh = list_entry(gl->gl_waiters3.next, | |
659 | struct gfs2_holder, gh_list); | |
660 | ||
661 | if (test_bit(HIF_PROMOTE, &gh->gh_iflags)) | |
662 | blocked = rq_promote(gh); | |
663 | else | |
664 | gfs2_assert_warn(gl->gl_sbd, 0); | |
665 | ||
666 | } else | |
667 | break; | |
668 | ||
669 | if (blocked) | |
670 | break; | |
671 | } | |
672 | } | |
673 | ||
674 | /** | |
675 | * gfs2_glmutex_lock - acquire a local lock on a glock | |
676 | * @gl: the glock | |
677 | * | |
678 | * Gives caller exclusive access to manipulate a glock structure. | |
679 | */ | |
680 | ||
feaa7bba | 681 | static void gfs2_glmutex_lock(struct gfs2_glock *gl) |
b3b94faa DT |
682 | { |
683 | struct gfs2_holder gh; | |
684 | ||
685 | gfs2_holder_init(gl, 0, 0, &gh); | |
686 | set_bit(HIF_MUTEX, &gh.gh_iflags); | |
687 | ||
688 | spin_lock(&gl->gl_spin); | |
85d1da67 | 689 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) { |
b3b94faa | 690 | list_add_tail(&gh.gh_list, &gl->gl_waiters1); |
85d1da67 | 691 | } else { |
320dd101 SW |
692 | gl->gl_owner = current; |
693 | gl->gl_ip = (unsigned long)__builtin_return_address(0); | |
b3b94faa | 694 | complete(&gh.gh_wait); |
320dd101 | 695 | } |
b3b94faa DT |
696 | spin_unlock(&gl->gl_spin); |
697 | ||
698 | wait_for_completion(&gh.gh_wait); | |
699 | gfs2_holder_uninit(&gh); | |
700 | } | |
701 | ||
702 | /** | |
703 | * gfs2_glmutex_trylock - try to acquire a local lock on a glock | |
704 | * @gl: the glock | |
705 | * | |
706 | * Returns: 1 if the glock is acquired | |
707 | */ | |
708 | ||
08bc2dbc | 709 | static int gfs2_glmutex_trylock(struct gfs2_glock *gl) |
b3b94faa DT |
710 | { |
711 | int acquired = 1; | |
712 | ||
713 | spin_lock(&gl->gl_spin); | |
85d1da67 | 714 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) { |
b3b94faa | 715 | acquired = 0; |
85d1da67 | 716 | } else { |
320dd101 SW |
717 | gl->gl_owner = current; |
718 | gl->gl_ip = (unsigned long)__builtin_return_address(0); | |
719 | } | |
b3b94faa DT |
720 | spin_unlock(&gl->gl_spin); |
721 | ||
722 | return acquired; | |
723 | } | |
724 | ||
725 | /** | |
726 | * gfs2_glmutex_unlock - release a local lock on a glock | |
727 | * @gl: the glock | |
728 | * | |
729 | */ | |
730 | ||
feaa7bba | 731 | static void gfs2_glmutex_unlock(struct gfs2_glock *gl) |
b3b94faa DT |
732 | { |
733 | spin_lock(&gl->gl_spin); | |
734 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
320dd101 SW |
735 | gl->gl_owner = NULL; |
736 | gl->gl_ip = 0; | |
b3b94faa | 737 | run_queue(gl); |
190562bd | 738 | BUG_ON(!spin_is_locked(&gl->gl_spin)); |
b3b94faa DT |
739 | spin_unlock(&gl->gl_spin); |
740 | } | |
741 | ||
742 | /** | |
743 | * handle_callback - add a demote request to a lock's queue | |
744 | * @gl: the glock | |
745 | * @state: the state the caller wants us to change to | |
746 | * | |
af18ddb8 | 747 | * Note: This may fail sliently if we are out of memory. |
b3b94faa DT |
748 | */ |
749 | ||
750 | static void handle_callback(struct gfs2_glock *gl, unsigned int state) | |
751 | { | |
752 | struct gfs2_holder *gh, *new_gh = NULL; | |
753 | ||
feaa7bba | 754 | restart: |
b3b94faa DT |
755 | spin_lock(&gl->gl_spin); |
756 | ||
757 | list_for_each_entry(gh, &gl->gl_waiters2, gh_list) { | |
758 | if (test_bit(HIF_DEMOTE, &gh->gh_iflags) && | |
759 | gl->gl_req_gh != gh) { | |
760 | if (gh->gh_state != state) | |
761 | gh->gh_state = LM_ST_UNLOCKED; | |
762 | goto out; | |
763 | } | |
764 | } | |
765 | ||
766 | if (new_gh) { | |
767 | list_add_tail(&new_gh->gh_list, &gl->gl_waiters2); | |
768 | new_gh = NULL; | |
769 | } else { | |
770 | spin_unlock(&gl->gl_spin); | |
771 | ||
ab923031 | 772 | new_gh = gfs2_holder_get(gl, state, LM_FLAG_TRY, GFP_NOFS); |
af18ddb8 SW |
773 | if (!new_gh) |
774 | return; | |
b3b94faa DT |
775 | set_bit(HIF_DEMOTE, &new_gh->gh_iflags); |
776 | set_bit(HIF_DEALLOC, &new_gh->gh_iflags); | |
777 | ||
778 | goto restart; | |
779 | } | |
780 | ||
feaa7bba | 781 | out: |
b3b94faa DT |
782 | spin_unlock(&gl->gl_spin); |
783 | ||
784 | if (new_gh) | |
785 | gfs2_holder_put(new_gh); | |
786 | } | |
787 | ||
788 | /** | |
789 | * state_change - record that the glock is now in a different state | |
790 | * @gl: the glock | |
791 | * @new_state the new state | |
792 | * | |
793 | */ | |
794 | ||
795 | static void state_change(struct gfs2_glock *gl, unsigned int new_state) | |
796 | { | |
b3b94faa DT |
797 | int held1, held2; |
798 | ||
799 | held1 = (gl->gl_state != LM_ST_UNLOCKED); | |
800 | held2 = (new_state != LM_ST_UNLOCKED); | |
801 | ||
802 | if (held1 != held2) { | |
6a6b3d01 | 803 | if (held2) |
b3b94faa | 804 | gfs2_glock_hold(gl); |
6a6b3d01 | 805 | else |
b3b94faa | 806 | gfs2_glock_put(gl); |
b3b94faa DT |
807 | } |
808 | ||
809 | gl->gl_state = new_state; | |
810 | } | |
811 | ||
812 | /** | |
813 | * xmote_bh - Called after the lock module is done acquiring a lock | |
814 | * @gl: The glock in question | |
815 | * @ret: the int returned from the lock module | |
816 | * | |
817 | */ | |
818 | ||
819 | static void xmote_bh(struct gfs2_glock *gl, unsigned int ret) | |
820 | { | |
821 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 822 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
823 | struct gfs2_holder *gh = gl->gl_req_gh; |
824 | int prev_state = gl->gl_state; | |
825 | int op_done = 1; | |
826 | ||
827 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
828 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
829 | gfs2_assert_warn(sdp, !(ret & LM_OUT_ASYNC)); | |
830 | ||
831 | state_change(gl, ret & LM_OUT_ST_MASK); | |
832 | ||
833 | if (prev_state != LM_ST_UNLOCKED && !(ret & LM_OUT_CACHEABLE)) { | |
834 | if (glops->go_inval) | |
1a14d3a6 | 835 | glops->go_inval(gl, DIO_METADATA); |
b3b94faa DT |
836 | } else if (gl->gl_state == LM_ST_DEFERRED) { |
837 | /* We might not want to do this here. | |
838 | Look at moving to the inode glops. */ | |
839 | if (glops->go_inval) | |
1a14d3a6 | 840 | glops->go_inval(gl, 0); |
b3b94faa DT |
841 | } |
842 | ||
843 | /* Deal with each possible exit condition */ | |
844 | ||
845 | if (!gh) | |
846 | gl->gl_stamp = jiffies; | |
b3b94faa DT |
847 | else if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) { |
848 | spin_lock(&gl->gl_spin); | |
849 | list_del_init(&gh->gh_list); | |
850 | gh->gh_error = -EIO; | |
b3b94faa | 851 | spin_unlock(&gl->gl_spin); |
b3b94faa DT |
852 | } else if (test_bit(HIF_DEMOTE, &gh->gh_iflags)) { |
853 | spin_lock(&gl->gl_spin); | |
854 | list_del_init(&gh->gh_list); | |
855 | if (gl->gl_state == gh->gh_state || | |
85d1da67 | 856 | gl->gl_state == LM_ST_UNLOCKED) { |
b3b94faa | 857 | gh->gh_error = 0; |
85d1da67 | 858 | } else { |
b3b94faa DT |
859 | if (gfs2_assert_warn(sdp, gh->gh_flags & |
860 | (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) == -1) | |
861 | fs_warn(sdp, "ret = 0x%.8X\n", ret); | |
862 | gh->gh_error = GLR_TRYFAILED; | |
863 | } | |
864 | spin_unlock(&gl->gl_spin); | |
865 | ||
866 | if (ret & LM_OUT_CANCELED) | |
50299965 | 867 | handle_callback(gl, LM_ST_UNLOCKED); |
b3b94faa DT |
868 | |
869 | } else if (ret & LM_OUT_CANCELED) { | |
870 | spin_lock(&gl->gl_spin); | |
871 | list_del_init(&gh->gh_list); | |
872 | gh->gh_error = GLR_CANCELED; | |
b3b94faa DT |
873 | spin_unlock(&gl->gl_spin); |
874 | ||
875 | } else if (relaxed_state_ok(gl->gl_state, gh->gh_state, gh->gh_flags)) { | |
876 | spin_lock(&gl->gl_spin); | |
877 | list_move_tail(&gh->gh_list, &gl->gl_holders); | |
878 | gh->gh_error = 0; | |
879 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
880 | spin_unlock(&gl->gl_spin); | |
881 | ||
882 | set_bit(HIF_FIRST, &gh->gh_iflags); | |
883 | ||
884 | op_done = 0; | |
885 | ||
886 | } else if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { | |
887 | spin_lock(&gl->gl_spin); | |
888 | list_del_init(&gh->gh_list); | |
889 | gh->gh_error = GLR_TRYFAILED; | |
b3b94faa DT |
890 | spin_unlock(&gl->gl_spin); |
891 | ||
892 | } else { | |
893 | if (gfs2_assert_withdraw(sdp, 0) == -1) | |
894 | fs_err(sdp, "ret = 0x%.8X\n", ret); | |
895 | } | |
896 | ||
897 | if (glops->go_xmote_bh) | |
898 | glops->go_xmote_bh(gl); | |
899 | ||
900 | if (op_done) { | |
901 | spin_lock(&gl->gl_spin); | |
902 | gl->gl_req_gh = NULL; | |
903 | gl->gl_req_bh = NULL; | |
904 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
905 | run_queue(gl); | |
906 | spin_unlock(&gl->gl_spin); | |
907 | } | |
908 | ||
909 | gfs2_glock_put(gl); | |
910 | ||
911 | if (gh) { | |
912 | if (test_bit(HIF_DEALLOC, &gh->gh_iflags)) | |
913 | gfs2_holder_put(gh); | |
914 | else | |
915 | complete(&gh->gh_wait); | |
916 | } | |
917 | } | |
918 | ||
919 | /** | |
920 | * gfs2_glock_xmote_th - Call into the lock module to acquire or change a glock | |
921 | * @gl: The glock in question | |
922 | * @state: the requested state | |
923 | * @flags: modifier flags to the lock call | |
924 | * | |
925 | */ | |
926 | ||
927 | void gfs2_glock_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags) | |
928 | { | |
929 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 930 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
931 | int lck_flags = flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB | |
932 | LM_FLAG_NOEXP | LM_FLAG_ANY | | |
933 | LM_FLAG_PRIORITY); | |
934 | unsigned int lck_ret; | |
935 | ||
936 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
937 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
938 | gfs2_assert_warn(sdp, state != LM_ST_UNLOCKED); | |
939 | gfs2_assert_warn(sdp, state != gl->gl_state); | |
940 | ||
50299965 | 941 | if (gl->gl_state == LM_ST_EXCLUSIVE && glops->go_sync) |
1a14d3a6 | 942 | glops->go_sync(gl); |
b3b94faa DT |
943 | |
944 | gfs2_glock_hold(gl); | |
945 | gl->gl_req_bh = xmote_bh; | |
946 | ||
ec45d9f5 | 947 | lck_ret = gfs2_lm_lock(sdp, gl->gl_lock, gl->gl_state, state, lck_flags); |
b3b94faa DT |
948 | |
949 | if (gfs2_assert_withdraw(sdp, !(lck_ret & LM_OUT_ERROR))) | |
950 | return; | |
951 | ||
952 | if (lck_ret & LM_OUT_ASYNC) | |
953 | gfs2_assert_warn(sdp, lck_ret == LM_OUT_ASYNC); | |
954 | else | |
955 | xmote_bh(gl, lck_ret); | |
956 | } | |
957 | ||
958 | /** | |
959 | * drop_bh - Called after a lock module unlock completes | |
960 | * @gl: the glock | |
961 | * @ret: the return status | |
962 | * | |
963 | * Doesn't wake up the process waiting on the struct gfs2_holder (if any) | |
964 | * Doesn't drop the reference on the glock the top half took out | |
965 | * | |
966 | */ | |
967 | ||
968 | static void drop_bh(struct gfs2_glock *gl, unsigned int ret) | |
969 | { | |
970 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 971 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
972 | struct gfs2_holder *gh = gl->gl_req_gh; |
973 | ||
b3b94faa DT |
974 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); |
975 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
976 | gfs2_assert_warn(sdp, !ret); | |
977 | ||
978 | state_change(gl, LM_ST_UNLOCKED); | |
979 | ||
980 | if (glops->go_inval) | |
1a14d3a6 | 981 | glops->go_inval(gl, DIO_METADATA); |
b3b94faa DT |
982 | |
983 | if (gh) { | |
984 | spin_lock(&gl->gl_spin); | |
985 | list_del_init(&gh->gh_list); | |
986 | gh->gh_error = 0; | |
987 | spin_unlock(&gl->gl_spin); | |
988 | } | |
989 | ||
990 | if (glops->go_drop_bh) | |
991 | glops->go_drop_bh(gl); | |
992 | ||
993 | spin_lock(&gl->gl_spin); | |
994 | gl->gl_req_gh = NULL; | |
995 | gl->gl_req_bh = NULL; | |
996 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
997 | run_queue(gl); | |
998 | spin_unlock(&gl->gl_spin); | |
999 | ||
1000 | gfs2_glock_put(gl); | |
1001 | ||
1002 | if (gh) { | |
1003 | if (test_bit(HIF_DEALLOC, &gh->gh_iflags)) | |
1004 | gfs2_holder_put(gh); | |
1005 | else | |
1006 | complete(&gh->gh_wait); | |
1007 | } | |
1008 | } | |
1009 | ||
1010 | /** | |
1011 | * gfs2_glock_drop_th - call into the lock module to unlock a lock | |
1012 | * @gl: the glock | |
1013 | * | |
1014 | */ | |
1015 | ||
1016 | void gfs2_glock_drop_th(struct gfs2_glock *gl) | |
1017 | { | |
1018 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 1019 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
1020 | unsigned int ret; |
1021 | ||
1022 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
1023 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
1024 | gfs2_assert_warn(sdp, gl->gl_state != LM_ST_UNLOCKED); | |
1025 | ||
50299965 | 1026 | if (gl->gl_state == LM_ST_EXCLUSIVE && glops->go_sync) |
1a14d3a6 | 1027 | glops->go_sync(gl); |
b3b94faa DT |
1028 | |
1029 | gfs2_glock_hold(gl); | |
1030 | gl->gl_req_bh = drop_bh; | |
1031 | ||
b3b94faa DT |
1032 | ret = gfs2_lm_unlock(sdp, gl->gl_lock, gl->gl_state); |
1033 | ||
1034 | if (gfs2_assert_withdraw(sdp, !(ret & LM_OUT_ERROR))) | |
1035 | return; | |
1036 | ||
1037 | if (!ret) | |
1038 | drop_bh(gl, ret); | |
1039 | else | |
1040 | gfs2_assert_warn(sdp, ret == LM_OUT_ASYNC); | |
1041 | } | |
1042 | ||
1043 | /** | |
1044 | * do_cancels - cancel requests for locks stuck waiting on an expire flag | |
1045 | * @gh: the LM_FLAG_PRIORITY holder waiting to acquire the lock | |
1046 | * | |
1047 | * Don't cancel GL_NOCANCEL requests. | |
1048 | */ | |
1049 | ||
1050 | static void do_cancels(struct gfs2_holder *gh) | |
1051 | { | |
1052 | struct gfs2_glock *gl = gh->gh_gl; | |
1053 | ||
1054 | spin_lock(&gl->gl_spin); | |
1055 | ||
1056 | while (gl->gl_req_gh != gh && | |
1057 | !test_bit(HIF_HOLDER, &gh->gh_iflags) && | |
1058 | !list_empty(&gh->gh_list)) { | |
50299965 SW |
1059 | if (gl->gl_req_bh && !(gl->gl_req_gh && |
1060 | (gl->gl_req_gh->gh_flags & GL_NOCANCEL))) { | |
b3b94faa DT |
1061 | spin_unlock(&gl->gl_spin); |
1062 | gfs2_lm_cancel(gl->gl_sbd, gl->gl_lock); | |
1063 | msleep(100); | |
1064 | spin_lock(&gl->gl_spin); | |
1065 | } else { | |
1066 | spin_unlock(&gl->gl_spin); | |
1067 | msleep(100); | |
1068 | spin_lock(&gl->gl_spin); | |
1069 | } | |
1070 | } | |
1071 | ||
1072 | spin_unlock(&gl->gl_spin); | |
1073 | } | |
1074 | ||
1075 | /** | |
1076 | * glock_wait_internal - wait on a glock acquisition | |
1077 | * @gh: the glock holder | |
1078 | * | |
1079 | * Returns: 0 on success | |
1080 | */ | |
1081 | ||
1082 | static int glock_wait_internal(struct gfs2_holder *gh) | |
1083 | { | |
1084 | struct gfs2_glock *gl = gh->gh_gl; | |
1085 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 1086 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
1087 | |
1088 | if (test_bit(HIF_ABORTED, &gh->gh_iflags)) | |
1089 | return -EIO; | |
1090 | ||
1091 | if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { | |
1092 | spin_lock(&gl->gl_spin); | |
1093 | if (gl->gl_req_gh != gh && | |
1094 | !test_bit(HIF_HOLDER, &gh->gh_iflags) && | |
1095 | !list_empty(&gh->gh_list)) { | |
1096 | list_del_init(&gh->gh_list); | |
1097 | gh->gh_error = GLR_TRYFAILED; | |
b3b94faa DT |
1098 | run_queue(gl); |
1099 | spin_unlock(&gl->gl_spin); | |
1100 | return gh->gh_error; | |
1101 | } | |
1102 | spin_unlock(&gl->gl_spin); | |
1103 | } | |
1104 | ||
1105 | if (gh->gh_flags & LM_FLAG_PRIORITY) | |
1106 | do_cancels(gh); | |
1107 | ||
1108 | wait_for_completion(&gh->gh_wait); | |
1109 | ||
1110 | if (gh->gh_error) | |
1111 | return gh->gh_error; | |
1112 | ||
1113 | gfs2_assert_withdraw(sdp, test_bit(HIF_HOLDER, &gh->gh_iflags)); | |
85d1da67 | 1114 | gfs2_assert_withdraw(sdp, relaxed_state_ok(gl->gl_state, gh->gh_state, |
b3b94faa DT |
1115 | gh->gh_flags)); |
1116 | ||
1117 | if (test_bit(HIF_FIRST, &gh->gh_iflags)) { | |
1118 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
1119 | ||
1120 | if (glops->go_lock) { | |
1121 | gh->gh_error = glops->go_lock(gh); | |
1122 | if (gh->gh_error) { | |
1123 | spin_lock(&gl->gl_spin); | |
1124 | list_del_init(&gh->gh_list); | |
b3b94faa DT |
1125 | spin_unlock(&gl->gl_spin); |
1126 | } | |
1127 | } | |
1128 | ||
1129 | spin_lock(&gl->gl_spin); | |
1130 | gl->gl_req_gh = NULL; | |
1131 | gl->gl_req_bh = NULL; | |
1132 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
b3b94faa DT |
1133 | run_queue(gl); |
1134 | spin_unlock(&gl->gl_spin); | |
1135 | } | |
1136 | ||
1137 | return gh->gh_error; | |
1138 | } | |
1139 | ||
1140 | static inline struct gfs2_holder * | |
1141 | find_holder_by_owner(struct list_head *head, struct task_struct *owner) | |
1142 | { | |
1143 | struct gfs2_holder *gh; | |
1144 | ||
1145 | list_for_each_entry(gh, head, gh_list) { | |
1146 | if (gh->gh_owner == owner) | |
1147 | return gh; | |
1148 | } | |
1149 | ||
1150 | return NULL; | |
1151 | } | |
1152 | ||
b3b94faa DT |
1153 | /** |
1154 | * add_to_queue - Add a holder to the wait queue (but look for recursion) | |
1155 | * @gh: the holder structure to add | |
1156 | * | |
1157 | */ | |
1158 | ||
1159 | static void add_to_queue(struct gfs2_holder *gh) | |
1160 | { | |
1161 | struct gfs2_glock *gl = gh->gh_gl; | |
1162 | struct gfs2_holder *existing; | |
1163 | ||
190562bd SW |
1164 | BUG_ON(!gh->gh_owner); |
1165 | ||
b3b94faa DT |
1166 | existing = find_holder_by_owner(&gl->gl_holders, gh->gh_owner); |
1167 | if (existing) { | |
5965b1f4 | 1168 | print_symbol(KERN_WARNING "original: %s\n", existing->gh_ip); |
86384605 | 1169 | printk(KERN_INFO "pid : %d\n", existing->gh_owner->pid); |
907b9bce | 1170 | printk(KERN_INFO "lock type : %d lock state : %d\n", |
86384605 | 1171 | existing->gh_gl->gl_name.ln_type, existing->gh_gl->gl_state); |
5965b1f4 | 1172 | print_symbol(KERN_WARNING "new: %s\n", gh->gh_ip); |
86384605 | 1173 | printk(KERN_INFO "pid : %d\n", gh->gh_owner->pid); |
907b9bce | 1174 | printk(KERN_INFO "lock type : %d lock state : %d\n", |
86384605 | 1175 | gl->gl_name.ln_type, gl->gl_state); |
5965b1f4 | 1176 | BUG(); |
b3b94faa DT |
1177 | } |
1178 | ||
1179 | existing = find_holder_by_owner(&gl->gl_waiters3, gh->gh_owner); | |
1180 | if (existing) { | |
5965b1f4 SW |
1181 | print_symbol(KERN_WARNING "original: %s\n", existing->gh_ip); |
1182 | print_symbol(KERN_WARNING "new: %s\n", gh->gh_ip); | |
1183 | BUG(); | |
b3b94faa DT |
1184 | } |
1185 | ||
b3b94faa DT |
1186 | if (gh->gh_flags & LM_FLAG_PRIORITY) |
1187 | list_add(&gh->gh_list, &gl->gl_waiters3); | |
1188 | else | |
907b9bce | 1189 | list_add_tail(&gh->gh_list, &gl->gl_waiters3); |
b3b94faa DT |
1190 | } |
1191 | ||
1192 | /** | |
1193 | * gfs2_glock_nq - enqueue a struct gfs2_holder onto a glock (acquire a glock) | |
1194 | * @gh: the holder structure | |
1195 | * | |
1196 | * if (gh->gh_flags & GL_ASYNC), this never returns an error | |
1197 | * | |
1198 | * Returns: 0, GLR_TRYFAILED, or errno on failure | |
1199 | */ | |
1200 | ||
1201 | int gfs2_glock_nq(struct gfs2_holder *gh) | |
1202 | { | |
1203 | struct gfs2_glock *gl = gh->gh_gl; | |
1204 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1205 | int error = 0; | |
1206 | ||
320dd101 | 1207 | restart: |
b3b94faa DT |
1208 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) { |
1209 | set_bit(HIF_ABORTED, &gh->gh_iflags); | |
1210 | return -EIO; | |
1211 | } | |
1212 | ||
1213 | set_bit(HIF_PROMOTE, &gh->gh_iflags); | |
1214 | ||
1215 | spin_lock(&gl->gl_spin); | |
1216 | add_to_queue(gh); | |
1217 | run_queue(gl); | |
1218 | spin_unlock(&gl->gl_spin); | |
1219 | ||
1220 | if (!(gh->gh_flags & GL_ASYNC)) { | |
1221 | error = glock_wait_internal(gh); | |
1222 | if (error == GLR_CANCELED) { | |
190562bd | 1223 | msleep(100); |
b3b94faa DT |
1224 | goto restart; |
1225 | } | |
1226 | } | |
1227 | ||
b3b94faa DT |
1228 | return error; |
1229 | } | |
1230 | ||
1231 | /** | |
1232 | * gfs2_glock_poll - poll to see if an async request has been completed | |
1233 | * @gh: the holder | |
1234 | * | |
1235 | * Returns: 1 if the request is ready to be gfs2_glock_wait()ed on | |
1236 | */ | |
1237 | ||
1238 | int gfs2_glock_poll(struct gfs2_holder *gh) | |
1239 | { | |
1240 | struct gfs2_glock *gl = gh->gh_gl; | |
1241 | int ready = 0; | |
1242 | ||
1243 | spin_lock(&gl->gl_spin); | |
1244 | ||
1245 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
1246 | ready = 1; | |
1247 | else if (list_empty(&gh->gh_list)) { | |
1248 | if (gh->gh_error == GLR_CANCELED) { | |
1249 | spin_unlock(&gl->gl_spin); | |
190562bd | 1250 | msleep(100); |
b3b94faa DT |
1251 | if (gfs2_glock_nq(gh)) |
1252 | return 1; | |
1253 | return 0; | |
1254 | } else | |
1255 | ready = 1; | |
1256 | } | |
1257 | ||
1258 | spin_unlock(&gl->gl_spin); | |
1259 | ||
1260 | return ready; | |
1261 | } | |
1262 | ||
1263 | /** | |
1264 | * gfs2_glock_wait - wait for a lock acquisition that ended in a GLR_ASYNC | |
1265 | * @gh: the holder structure | |
1266 | * | |
1267 | * Returns: 0, GLR_TRYFAILED, or errno on failure | |
1268 | */ | |
1269 | ||
1270 | int gfs2_glock_wait(struct gfs2_holder *gh) | |
1271 | { | |
1272 | int error; | |
1273 | ||
1274 | error = glock_wait_internal(gh); | |
1275 | if (error == GLR_CANCELED) { | |
190562bd | 1276 | msleep(100); |
b3b94faa DT |
1277 | gh->gh_flags &= ~GL_ASYNC; |
1278 | error = gfs2_glock_nq(gh); | |
1279 | } | |
1280 | ||
1281 | return error; | |
1282 | } | |
1283 | ||
1284 | /** | |
1285 | * gfs2_glock_dq - dequeue a struct gfs2_holder from a glock (release a glock) | |
1286 | * @gh: the glock holder | |
1287 | * | |
1288 | */ | |
1289 | ||
1290 | void gfs2_glock_dq(struct gfs2_holder *gh) | |
1291 | { | |
1292 | struct gfs2_glock *gl = gh->gh_gl; | |
8fb4b536 | 1293 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa | 1294 | |
b3b94faa DT |
1295 | if (gh->gh_flags & GL_NOCACHE) |
1296 | handle_callback(gl, LM_ST_UNLOCKED); | |
1297 | ||
1298 | gfs2_glmutex_lock(gl); | |
1299 | ||
1300 | spin_lock(&gl->gl_spin); | |
1301 | list_del_init(&gh->gh_list); | |
1302 | ||
1303 | if (list_empty(&gl->gl_holders)) { | |
1304 | spin_unlock(&gl->gl_spin); | |
1305 | ||
1306 | if (glops->go_unlock) | |
1307 | glops->go_unlock(gh); | |
1308 | ||
b3b94faa DT |
1309 | gl->gl_stamp = jiffies; |
1310 | ||
1311 | spin_lock(&gl->gl_spin); | |
1312 | } | |
1313 | ||
1314 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
1315 | run_queue(gl); | |
1316 | spin_unlock(&gl->gl_spin); | |
1317 | } | |
1318 | ||
c4028958 | 1319 | static void greedy_work(struct work_struct *work) |
b3b94faa | 1320 | { |
c4028958 | 1321 | struct greedy *gr = container_of(work, struct greedy, gr_work.work); |
b3b94faa DT |
1322 | struct gfs2_holder *gh = &gr->gr_gh; |
1323 | struct gfs2_glock *gl = gh->gh_gl; | |
8fb4b536 | 1324 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
1325 | |
1326 | clear_bit(GLF_SKIP_WAITERS2, &gl->gl_flags); | |
1327 | ||
1328 | if (glops->go_greedy) | |
1329 | glops->go_greedy(gl); | |
1330 | ||
1331 | spin_lock(&gl->gl_spin); | |
1332 | ||
1333 | if (list_empty(&gl->gl_waiters2)) { | |
1334 | clear_bit(GLF_GREEDY, &gl->gl_flags); | |
1335 | spin_unlock(&gl->gl_spin); | |
1336 | gfs2_holder_uninit(gh); | |
1337 | kfree(gr); | |
1338 | } else { | |
1339 | gfs2_glock_hold(gl); | |
1340 | list_add_tail(&gh->gh_list, &gl->gl_waiters2); | |
1341 | run_queue(gl); | |
1342 | spin_unlock(&gl->gl_spin); | |
1343 | gfs2_glock_put(gl); | |
1344 | } | |
1345 | } | |
1346 | ||
1347 | /** | |
1348 | * gfs2_glock_be_greedy - | |
1349 | * @gl: | |
1350 | * @time: | |
1351 | * | |
1352 | * Returns: 0 if go_greedy will be called, 1 otherwise | |
1353 | */ | |
1354 | ||
1355 | int gfs2_glock_be_greedy(struct gfs2_glock *gl, unsigned int time) | |
1356 | { | |
1357 | struct greedy *gr; | |
1358 | struct gfs2_holder *gh; | |
1359 | ||
feaa7bba | 1360 | if (!time || gl->gl_sbd->sd_args.ar_localcaching || |
b3b94faa DT |
1361 | test_and_set_bit(GLF_GREEDY, &gl->gl_flags)) |
1362 | return 1; | |
1363 | ||
1364 | gr = kmalloc(sizeof(struct greedy), GFP_KERNEL); | |
1365 | if (!gr) { | |
1366 | clear_bit(GLF_GREEDY, &gl->gl_flags); | |
1367 | return 1; | |
1368 | } | |
1369 | gh = &gr->gr_gh; | |
1370 | ||
579b78a4 | 1371 | gfs2_holder_init(gl, 0, 0, gh); |
b3b94faa | 1372 | set_bit(HIF_GREEDY, &gh->gh_iflags); |
c4028958 | 1373 | INIT_DELAYED_WORK(&gr->gr_work, greedy_work); |
b3b94faa DT |
1374 | |
1375 | set_bit(GLF_SKIP_WAITERS2, &gl->gl_flags); | |
1376 | schedule_delayed_work(&gr->gr_work, time); | |
1377 | ||
1378 | return 0; | |
1379 | } | |
1380 | ||
b3b94faa DT |
1381 | /** |
1382 | * gfs2_glock_dq_uninit - dequeue a holder from a glock and initialize it | |
1383 | * @gh: the holder structure | |
1384 | * | |
1385 | */ | |
1386 | ||
1387 | void gfs2_glock_dq_uninit(struct gfs2_holder *gh) | |
1388 | { | |
1389 | gfs2_glock_dq(gh); | |
1390 | gfs2_holder_uninit(gh); | |
1391 | } | |
1392 | ||
1393 | /** | |
1394 | * gfs2_glock_nq_num - acquire a glock based on lock number | |
1395 | * @sdp: the filesystem | |
1396 | * @number: the lock number | |
1397 | * @glops: the glock operations for the type of glock | |
1398 | * @state: the state to acquire the glock in | |
1399 | * @flags: modifier flags for the aquisition | |
1400 | * @gh: the struct gfs2_holder | |
1401 | * | |
1402 | * Returns: errno | |
1403 | */ | |
1404 | ||
cd915493 | 1405 | int gfs2_glock_nq_num(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 SW |
1406 | const struct gfs2_glock_operations *glops, |
1407 | unsigned int state, int flags, struct gfs2_holder *gh) | |
b3b94faa DT |
1408 | { |
1409 | struct gfs2_glock *gl; | |
1410 | int error; | |
1411 | ||
1412 | error = gfs2_glock_get(sdp, number, glops, CREATE, &gl); | |
1413 | if (!error) { | |
1414 | error = gfs2_glock_nq_init(gl, state, flags, gh); | |
1415 | gfs2_glock_put(gl); | |
1416 | } | |
1417 | ||
1418 | return error; | |
1419 | } | |
1420 | ||
1421 | /** | |
1422 | * glock_compare - Compare two struct gfs2_glock structures for sorting | |
1423 | * @arg_a: the first structure | |
1424 | * @arg_b: the second structure | |
1425 | * | |
1426 | */ | |
1427 | ||
1428 | static int glock_compare(const void *arg_a, const void *arg_b) | |
1429 | { | |
a5e08a9e SW |
1430 | const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a; |
1431 | const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b; | |
1432 | const struct lm_lockname *a = &gh_a->gh_gl->gl_name; | |
1433 | const struct lm_lockname *b = &gh_b->gh_gl->gl_name; | |
b3b94faa DT |
1434 | |
1435 | if (a->ln_number > b->ln_number) | |
a5e08a9e SW |
1436 | return 1; |
1437 | if (a->ln_number < b->ln_number) | |
1438 | return -1; | |
1439 | if (gh_a->gh_state == LM_ST_SHARED && gh_b->gh_state == LM_ST_EXCLUSIVE) | |
1440 | return 1; | |
1441 | if (!(gh_a->gh_flags & GL_LOCAL_EXCL) && (gh_b->gh_flags & GL_LOCAL_EXCL)) | |
1442 | return 1; | |
1443 | return 0; | |
b3b94faa DT |
1444 | } |
1445 | ||
1446 | /** | |
1447 | * nq_m_sync - synchonously acquire more than one glock in deadlock free order | |
1448 | * @num_gh: the number of structures | |
1449 | * @ghs: an array of struct gfs2_holder structures | |
1450 | * | |
1451 | * Returns: 0 on success (all glocks acquired), | |
1452 | * errno on failure (no glocks acquired) | |
1453 | */ | |
1454 | ||
1455 | static int nq_m_sync(unsigned int num_gh, struct gfs2_holder *ghs, | |
1456 | struct gfs2_holder **p) | |
1457 | { | |
1458 | unsigned int x; | |
1459 | int error = 0; | |
1460 | ||
1461 | for (x = 0; x < num_gh; x++) | |
1462 | p[x] = &ghs[x]; | |
1463 | ||
1464 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare, NULL); | |
1465 | ||
1466 | for (x = 0; x < num_gh; x++) { | |
1467 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1468 | ||
1469 | error = gfs2_glock_nq(p[x]); | |
1470 | if (error) { | |
1471 | while (x--) | |
1472 | gfs2_glock_dq(p[x]); | |
1473 | break; | |
1474 | } | |
1475 | } | |
1476 | ||
1477 | return error; | |
1478 | } | |
1479 | ||
1480 | /** | |
1481 | * gfs2_glock_nq_m - acquire multiple glocks | |
1482 | * @num_gh: the number of structures | |
1483 | * @ghs: an array of struct gfs2_holder structures | |
1484 | * | |
1485 | * Figure out how big an impact this function has. Either: | |
1486 | * 1) Replace this code with code that calls gfs2_glock_prefetch() | |
1487 | * 2) Forget async stuff and just call nq_m_sync() | |
1488 | * 3) Leave it like it is | |
1489 | * | |
1490 | * Returns: 0 on success (all glocks acquired), | |
1491 | * errno on failure (no glocks acquired) | |
1492 | */ | |
1493 | ||
1494 | int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1495 | { | |
1496 | int *e; | |
1497 | unsigned int x; | |
1498 | int borked = 0, serious = 0; | |
1499 | int error = 0; | |
1500 | ||
1501 | if (!num_gh) | |
1502 | return 0; | |
1503 | ||
1504 | if (num_gh == 1) { | |
1505 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1506 | return gfs2_glock_nq(ghs); | |
1507 | } | |
1508 | ||
1509 | e = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL); | |
1510 | if (!e) | |
1511 | return -ENOMEM; | |
1512 | ||
1513 | for (x = 0; x < num_gh; x++) { | |
1514 | ghs[x].gh_flags |= LM_FLAG_TRY | GL_ASYNC; | |
1515 | error = gfs2_glock_nq(&ghs[x]); | |
1516 | if (error) { | |
1517 | borked = 1; | |
1518 | serious = error; | |
1519 | num_gh = x; | |
1520 | break; | |
1521 | } | |
1522 | } | |
1523 | ||
1524 | for (x = 0; x < num_gh; x++) { | |
1525 | error = e[x] = glock_wait_internal(&ghs[x]); | |
1526 | if (error) { | |
1527 | borked = 1; | |
1528 | if (error != GLR_TRYFAILED && error != GLR_CANCELED) | |
1529 | serious = error; | |
1530 | } | |
1531 | } | |
1532 | ||
1533 | if (!borked) { | |
1534 | kfree(e); | |
1535 | return 0; | |
1536 | } | |
1537 | ||
1538 | for (x = 0; x < num_gh; x++) | |
1539 | if (!e[x]) | |
1540 | gfs2_glock_dq(&ghs[x]); | |
1541 | ||
1542 | if (serious) | |
1543 | error = serious; | |
1544 | else { | |
1545 | for (x = 0; x < num_gh; x++) | |
1546 | gfs2_holder_reinit(ghs[x].gh_state, ghs[x].gh_flags, | |
1547 | &ghs[x]); | |
1548 | error = nq_m_sync(num_gh, ghs, (struct gfs2_holder **)e); | |
1549 | } | |
1550 | ||
1551 | kfree(e); | |
1552 | ||
1553 | return error; | |
1554 | } | |
1555 | ||
1556 | /** | |
1557 | * gfs2_glock_dq_m - release multiple glocks | |
1558 | * @num_gh: the number of structures | |
1559 | * @ghs: an array of struct gfs2_holder structures | |
1560 | * | |
1561 | */ | |
1562 | ||
1563 | void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1564 | { | |
1565 | unsigned int x; | |
1566 | ||
1567 | for (x = 0; x < num_gh; x++) | |
1568 | gfs2_glock_dq(&ghs[x]); | |
1569 | } | |
1570 | ||
1571 | /** | |
1572 | * gfs2_glock_dq_uninit_m - release multiple glocks | |
1573 | * @num_gh: the number of structures | |
1574 | * @ghs: an array of struct gfs2_holder structures | |
1575 | * | |
1576 | */ | |
1577 | ||
1578 | void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1579 | { | |
1580 | unsigned int x; | |
1581 | ||
1582 | for (x = 0; x < num_gh; x++) | |
1583 | gfs2_glock_dq_uninit(&ghs[x]); | |
1584 | } | |
1585 | ||
b3b94faa DT |
1586 | /** |
1587 | * gfs2_lvb_hold - attach a LVB from a glock | |
1588 | * @gl: The glock in question | |
1589 | * | |
1590 | */ | |
1591 | ||
1592 | int gfs2_lvb_hold(struct gfs2_glock *gl) | |
1593 | { | |
1594 | int error; | |
1595 | ||
1596 | gfs2_glmutex_lock(gl); | |
1597 | ||
1598 | if (!atomic_read(&gl->gl_lvb_count)) { | |
1599 | error = gfs2_lm_hold_lvb(gl->gl_sbd, gl->gl_lock, &gl->gl_lvb); | |
1600 | if (error) { | |
1601 | gfs2_glmutex_unlock(gl); | |
1602 | return error; | |
1603 | } | |
1604 | gfs2_glock_hold(gl); | |
1605 | } | |
1606 | atomic_inc(&gl->gl_lvb_count); | |
1607 | ||
1608 | gfs2_glmutex_unlock(gl); | |
1609 | ||
1610 | return 0; | |
1611 | } | |
1612 | ||
1613 | /** | |
1614 | * gfs2_lvb_unhold - detach a LVB from a glock | |
1615 | * @gl: The glock in question | |
1616 | * | |
1617 | */ | |
1618 | ||
1619 | void gfs2_lvb_unhold(struct gfs2_glock *gl) | |
1620 | { | |
1621 | gfs2_glock_hold(gl); | |
1622 | gfs2_glmutex_lock(gl); | |
1623 | ||
1624 | gfs2_assert(gl->gl_sbd, atomic_read(&gl->gl_lvb_count) > 0); | |
1625 | if (atomic_dec_and_test(&gl->gl_lvb_count)) { | |
1626 | gfs2_lm_unhold_lvb(gl->gl_sbd, gl->gl_lock, gl->gl_lvb); | |
1627 | gl->gl_lvb = NULL; | |
1628 | gfs2_glock_put(gl); | |
1629 | } | |
1630 | ||
1631 | gfs2_glmutex_unlock(gl); | |
1632 | gfs2_glock_put(gl); | |
1633 | } | |
1634 | ||
b3b94faa DT |
1635 | static void blocking_cb(struct gfs2_sbd *sdp, struct lm_lockname *name, |
1636 | unsigned int state) | |
1637 | { | |
1638 | struct gfs2_glock *gl; | |
1639 | ||
1640 | gl = gfs2_glock_find(sdp, name); | |
1641 | if (!gl) | |
1642 | return; | |
1643 | ||
1644 | if (gl->gl_ops->go_callback) | |
1645 | gl->gl_ops->go_callback(gl, state); | |
1646 | handle_callback(gl, state); | |
1647 | ||
1648 | spin_lock(&gl->gl_spin); | |
1649 | run_queue(gl); | |
1650 | spin_unlock(&gl->gl_spin); | |
1651 | ||
1652 | gfs2_glock_put(gl); | |
1653 | } | |
1654 | ||
1655 | /** | |
1656 | * gfs2_glock_cb - Callback used by locking module | |
1c089c32 | 1657 | * @sdp: Pointer to the superblock |
b3b94faa DT |
1658 | * @type: Type of callback |
1659 | * @data: Type dependent data pointer | |
1660 | * | |
1661 | * Called by the locking module when it wants to tell us something. | |
1662 | * Either we need to drop a lock, one of our ASYNC requests completed, or | |
1663 | * a journal from another client needs to be recovered. | |
1664 | */ | |
1665 | ||
9b47c11d | 1666 | void gfs2_glock_cb(void *cb_data, unsigned int type, void *data) |
b3b94faa | 1667 | { |
9b47c11d | 1668 | struct gfs2_sbd *sdp = cb_data; |
b3b94faa | 1669 | |
b3b94faa DT |
1670 | switch (type) { |
1671 | case LM_CB_NEED_E: | |
e7f5c01c | 1672 | blocking_cb(sdp, data, LM_ST_UNLOCKED); |
b3b94faa DT |
1673 | return; |
1674 | ||
1675 | case LM_CB_NEED_D: | |
e7f5c01c | 1676 | blocking_cb(sdp, data, LM_ST_DEFERRED); |
b3b94faa DT |
1677 | return; |
1678 | ||
1679 | case LM_CB_NEED_S: | |
e7f5c01c | 1680 | blocking_cb(sdp, data, LM_ST_SHARED); |
b3b94faa DT |
1681 | return; |
1682 | ||
1683 | case LM_CB_ASYNC: { | |
e7f5c01c | 1684 | struct lm_async_cb *async = data; |
b3b94faa DT |
1685 | struct gfs2_glock *gl; |
1686 | ||
1687 | gl = gfs2_glock_find(sdp, &async->lc_name); | |
1688 | if (gfs2_assert_warn(sdp, gl)) | |
1689 | return; | |
1690 | if (!gfs2_assert_warn(sdp, gl->gl_req_bh)) | |
1691 | gl->gl_req_bh(gl, async->lc_ret); | |
1692 | gfs2_glock_put(gl); | |
b3b94faa DT |
1693 | return; |
1694 | } | |
1695 | ||
1696 | case LM_CB_NEED_RECOVERY: | |
1697 | gfs2_jdesc_make_dirty(sdp, *(unsigned int *)data); | |
1698 | if (sdp->sd_recoverd_process) | |
1699 | wake_up_process(sdp->sd_recoverd_process); | |
1700 | return; | |
1701 | ||
1702 | case LM_CB_DROPLOCKS: | |
1703 | gfs2_gl_hash_clear(sdp, NO_WAIT); | |
1704 | gfs2_quota_scan(sdp); | |
1705 | return; | |
1706 | ||
1707 | default: | |
1708 | gfs2_assert_warn(sdp, 0); | |
1709 | return; | |
1710 | } | |
1711 | } | |
1712 | ||
b3b94faa DT |
1713 | /** |
1714 | * demote_ok - Check to see if it's ok to unlock a glock | |
1715 | * @gl: the glock | |
1716 | * | |
1717 | * Returns: 1 if it's ok | |
1718 | */ | |
1719 | ||
1720 | static int demote_ok(struct gfs2_glock *gl) | |
1721 | { | |
8fb4b536 | 1722 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
1723 | int demote = 1; |
1724 | ||
1725 | if (test_bit(GLF_STICKY, &gl->gl_flags)) | |
1726 | demote = 0; | |
b3b94faa DT |
1727 | else if (glops->go_demote_ok) |
1728 | demote = glops->go_demote_ok(gl); | |
1729 | ||
1730 | return demote; | |
1731 | } | |
1732 | ||
1733 | /** | |
1734 | * gfs2_glock_schedule_for_reclaim - Add a glock to the reclaim list | |
1735 | * @gl: the glock | |
1736 | * | |
1737 | */ | |
1738 | ||
1739 | void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl) | |
1740 | { | |
1741 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1742 | ||
1743 | spin_lock(&sdp->sd_reclaim_lock); | |
1744 | if (list_empty(&gl->gl_reclaim)) { | |
1745 | gfs2_glock_hold(gl); | |
1746 | list_add(&gl->gl_reclaim, &sdp->sd_reclaim_list); | |
1747 | atomic_inc(&sdp->sd_reclaim_count); | |
1748 | } | |
1749 | spin_unlock(&sdp->sd_reclaim_lock); | |
1750 | ||
1751 | wake_up(&sdp->sd_reclaim_wq); | |
1752 | } | |
1753 | ||
1754 | /** | |
1755 | * gfs2_reclaim_glock - process the next glock on the filesystem's reclaim list | |
1756 | * @sdp: the filesystem | |
1757 | * | |
1758 | * Called from gfs2_glockd() glock reclaim daemon, or when promoting a | |
1759 | * different glock and we notice that there are a lot of glocks in the | |
1760 | * reclaim list. | |
1761 | * | |
1762 | */ | |
1763 | ||
1764 | void gfs2_reclaim_glock(struct gfs2_sbd *sdp) | |
1765 | { | |
1766 | struct gfs2_glock *gl; | |
1767 | ||
1768 | spin_lock(&sdp->sd_reclaim_lock); | |
1769 | if (list_empty(&sdp->sd_reclaim_list)) { | |
1770 | spin_unlock(&sdp->sd_reclaim_lock); | |
1771 | return; | |
1772 | } | |
1773 | gl = list_entry(sdp->sd_reclaim_list.next, | |
1774 | struct gfs2_glock, gl_reclaim); | |
1775 | list_del_init(&gl->gl_reclaim); | |
1776 | spin_unlock(&sdp->sd_reclaim_lock); | |
1777 | ||
1778 | atomic_dec(&sdp->sd_reclaim_count); | |
1779 | atomic_inc(&sdp->sd_reclaimed); | |
1780 | ||
1781 | if (gfs2_glmutex_trylock(gl)) { | |
b3b94faa | 1782 | if (queue_empty(gl, &gl->gl_holders) && |
50299965 | 1783 | gl->gl_state != LM_ST_UNLOCKED && demote_ok(gl)) |
b3b94faa DT |
1784 | handle_callback(gl, LM_ST_UNLOCKED); |
1785 | gfs2_glmutex_unlock(gl); | |
1786 | } | |
1787 | ||
1788 | gfs2_glock_put(gl); | |
1789 | } | |
1790 | ||
1791 | /** | |
1792 | * examine_bucket - Call a function for glock in a hash bucket | |
1793 | * @examiner: the function | |
1794 | * @sdp: the filesystem | |
1795 | * @bucket: the bucket | |
1796 | * | |
1797 | * Returns: 1 if the bucket has entries | |
1798 | */ | |
1799 | ||
1800 | static int examine_bucket(glock_examiner examiner, struct gfs2_sbd *sdp, | |
37b2fa6a | 1801 | unsigned int hash) |
b3b94faa | 1802 | { |
24264434 SW |
1803 | struct gfs2_glock *gl, *prev = NULL; |
1804 | int has_entries = 0; | |
b6397893 | 1805 | struct hlist_head *head = &gl_hash_table[hash].hb_list; |
b3b94faa | 1806 | |
24264434 | 1807 | read_lock(gl_lock_addr(hash)); |
b6397893 SW |
1808 | /* Can't use hlist_for_each_entry - don't want prefetch here */ |
1809 | if (hlist_empty(head)) | |
24264434 | 1810 | goto out; |
b6397893 SW |
1811 | gl = list_entry(head->first, struct gfs2_glock, gl_list); |
1812 | while(1) { | |
24264434 | 1813 | if (gl->gl_sbd == sdp) { |
b3b94faa | 1814 | gfs2_glock_hold(gl); |
24264434 SW |
1815 | read_unlock(gl_lock_addr(hash)); |
1816 | if (prev) | |
1817 | gfs2_glock_put(prev); | |
1818 | prev = gl; | |
1819 | examiner(gl); | |
a8336344 | 1820 | has_entries = 1; |
24264434 | 1821 | read_lock(gl_lock_addr(hash)); |
b3b94faa | 1822 | } |
b6397893 SW |
1823 | if (gl->gl_list.next == NULL) |
1824 | break; | |
24264434 | 1825 | gl = list_entry(gl->gl_list.next, struct gfs2_glock, gl_list); |
b3b94faa | 1826 | } |
24264434 SW |
1827 | out: |
1828 | read_unlock(gl_lock_addr(hash)); | |
1829 | if (prev) | |
1830 | gfs2_glock_put(prev); | |
1831 | return has_entries; | |
b3b94faa DT |
1832 | } |
1833 | ||
1834 | /** | |
1835 | * scan_glock - look at a glock and see if we can reclaim it | |
1836 | * @gl: the glock to look at | |
1837 | * | |
1838 | */ | |
1839 | ||
1840 | static void scan_glock(struct gfs2_glock *gl) | |
1841 | { | |
b004157a | 1842 | if (gl->gl_ops == &gfs2_inode_glops && gl->gl_object) |
24264434 | 1843 | return; |
a2242db0 | 1844 | |
b3b94faa | 1845 | if (gfs2_glmutex_trylock(gl)) { |
b3b94faa | 1846 | if (queue_empty(gl, &gl->gl_holders) && |
24264434 | 1847 | gl->gl_state != LM_ST_UNLOCKED && demote_ok(gl)) |
b3b94faa | 1848 | goto out_schedule; |
b3b94faa DT |
1849 | gfs2_glmutex_unlock(gl); |
1850 | } | |
b3b94faa DT |
1851 | return; |
1852 | ||
627add2d | 1853 | out_schedule: |
b3b94faa DT |
1854 | gfs2_glmutex_unlock(gl); |
1855 | gfs2_glock_schedule_for_reclaim(gl); | |
b3b94faa DT |
1856 | } |
1857 | ||
1858 | /** | |
1859 | * gfs2_scand_internal - Look for glocks and inodes to toss from memory | |
1860 | * @sdp: the filesystem | |
1861 | * | |
1862 | */ | |
1863 | ||
1864 | void gfs2_scand_internal(struct gfs2_sbd *sdp) | |
1865 | { | |
1866 | unsigned int x; | |
1867 | ||
94610610 | 1868 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) |
37b2fa6a | 1869 | examine_bucket(scan_glock, sdp, x); |
b3b94faa DT |
1870 | } |
1871 | ||
1872 | /** | |
1873 | * clear_glock - look at a glock and see if we can free it from glock cache | |
1874 | * @gl: the glock to look at | |
1875 | * | |
1876 | */ | |
1877 | ||
1878 | static void clear_glock(struct gfs2_glock *gl) | |
1879 | { | |
1880 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1881 | int released; | |
1882 | ||
1883 | spin_lock(&sdp->sd_reclaim_lock); | |
1884 | if (!list_empty(&gl->gl_reclaim)) { | |
1885 | list_del_init(&gl->gl_reclaim); | |
1886 | atomic_dec(&sdp->sd_reclaim_count); | |
190562bd | 1887 | spin_unlock(&sdp->sd_reclaim_lock); |
b3b94faa DT |
1888 | released = gfs2_glock_put(gl); |
1889 | gfs2_assert(sdp, !released); | |
190562bd SW |
1890 | } else { |
1891 | spin_unlock(&sdp->sd_reclaim_lock); | |
b3b94faa | 1892 | } |
b3b94faa DT |
1893 | |
1894 | if (gfs2_glmutex_trylock(gl)) { | |
b3b94faa DT |
1895 | if (queue_empty(gl, &gl->gl_holders) && |
1896 | gl->gl_state != LM_ST_UNLOCKED) | |
1897 | handle_callback(gl, LM_ST_UNLOCKED); | |
b3b94faa DT |
1898 | gfs2_glmutex_unlock(gl); |
1899 | } | |
b3b94faa DT |
1900 | } |
1901 | ||
1902 | /** | |
1903 | * gfs2_gl_hash_clear - Empty out the glock hash table | |
1904 | * @sdp: the filesystem | |
1905 | * @wait: wait until it's all gone | |
1906 | * | |
1907 | * Called when unmounting the filesystem, or when inter-node lock manager | |
1908 | * requests DROPLOCKS because it is running out of capacity. | |
1909 | */ | |
1910 | ||
1911 | void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait) | |
1912 | { | |
1913 | unsigned long t; | |
1914 | unsigned int x; | |
1915 | int cont; | |
1916 | ||
1917 | t = jiffies; | |
1918 | ||
1919 | for (;;) { | |
1920 | cont = 0; | |
24264434 | 1921 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) { |
907b9bce | 1922 | if (examine_bucket(clear_glock, sdp, x)) |
b3b94faa | 1923 | cont = 1; |
24264434 | 1924 | } |
b3b94faa DT |
1925 | |
1926 | if (!wait || !cont) | |
1927 | break; | |
1928 | ||
1929 | if (time_after_eq(jiffies, | |
1930 | t + gfs2_tune_get(sdp, gt_stall_secs) * HZ)) { | |
1931 | fs_warn(sdp, "Unmount seems to be stalled. " | |
1932 | "Dumping lock state...\n"); | |
1933 | gfs2_dump_lockstate(sdp); | |
1934 | t = jiffies; | |
1935 | } | |
1936 | ||
b3b94faa | 1937 | invalidate_inodes(sdp->sd_vfs); |
fd88de56 | 1938 | msleep(10); |
b3b94faa DT |
1939 | } |
1940 | } | |
1941 | ||
1942 | /* | |
1943 | * Diagnostic routines to help debug distributed deadlock | |
1944 | */ | |
1945 | ||
1946 | /** | |
1947 | * dump_holder - print information about a glock holder | |
1948 | * @str: a string naming the type of holder | |
1949 | * @gh: the glock holder | |
1950 | * | |
1951 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
1952 | */ | |
1953 | ||
1954 | static int dump_holder(char *str, struct gfs2_holder *gh) | |
1955 | { | |
1956 | unsigned int x; | |
1957 | int error = -ENOBUFS; | |
1958 | ||
d92a8d48 SW |
1959 | printk(KERN_INFO " %s\n", str); |
1960 | printk(KERN_INFO " owner = %ld\n", | |
b3b94faa | 1961 | (gh->gh_owner) ? (long)gh->gh_owner->pid : -1); |
d92a8d48 SW |
1962 | printk(KERN_INFO " gh_state = %u\n", gh->gh_state); |
1963 | printk(KERN_INFO " gh_flags ="); | |
b3b94faa DT |
1964 | for (x = 0; x < 32; x++) |
1965 | if (gh->gh_flags & (1 << x)) | |
1966 | printk(" %u", x); | |
1967 | printk(" \n"); | |
d92a8d48 SW |
1968 | printk(KERN_INFO " error = %d\n", gh->gh_error); |
1969 | printk(KERN_INFO " gh_iflags ="); | |
b3b94faa DT |
1970 | for (x = 0; x < 32; x++) |
1971 | if (test_bit(x, &gh->gh_iflags)) | |
1972 | printk(" %u", x); | |
1973 | printk(" \n"); | |
d0dc80db | 1974 | print_symbol(KERN_INFO " initialized at: %s\n", gh->gh_ip); |
b3b94faa DT |
1975 | |
1976 | error = 0; | |
1977 | ||
1978 | return error; | |
1979 | } | |
1980 | ||
1981 | /** | |
1982 | * dump_inode - print information about an inode | |
1983 | * @ip: the inode | |
1984 | * | |
1985 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
1986 | */ | |
1987 | ||
1988 | static int dump_inode(struct gfs2_inode *ip) | |
1989 | { | |
1990 | unsigned int x; | |
1991 | int error = -ENOBUFS; | |
1992 | ||
d92a8d48 SW |
1993 | printk(KERN_INFO " Inode:\n"); |
1994 | printk(KERN_INFO " num = %llu %llu\n", | |
382066da SW |
1995 | (unsigned long long)ip->i_num.no_formal_ino, |
1996 | (unsigned long long)ip->i_num.no_addr); | |
b60623c2 | 1997 | printk(KERN_INFO " type = %u\n", IF2DT(ip->i_inode.i_mode)); |
d92a8d48 | 1998 | printk(KERN_INFO " i_flags ="); |
b3b94faa DT |
1999 | for (x = 0; x < 32; x++) |
2000 | if (test_bit(x, &ip->i_flags)) | |
2001 | printk(" %u", x); | |
2002 | printk(" \n"); | |
b3b94faa DT |
2003 | |
2004 | error = 0; | |
2005 | ||
2006 | return error; | |
2007 | } | |
2008 | ||
2009 | /** | |
2010 | * dump_glock - print information about a glock | |
2011 | * @gl: the glock | |
2012 | * @count: where we are in the buffer | |
2013 | * | |
2014 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
2015 | */ | |
2016 | ||
2017 | static int dump_glock(struct gfs2_glock *gl) | |
2018 | { | |
2019 | struct gfs2_holder *gh; | |
2020 | unsigned int x; | |
2021 | int error = -ENOBUFS; | |
2022 | ||
2023 | spin_lock(&gl->gl_spin); | |
2024 | ||
85d1da67 | 2025 | printk(KERN_INFO "Glock 0x%p (%u, %llu)\n", gl, gl->gl_name.ln_type, |
382066da | 2026 | (unsigned long long)gl->gl_name.ln_number); |
d92a8d48 | 2027 | printk(KERN_INFO " gl_flags ="); |
85d1da67 | 2028 | for (x = 0; x < 32; x++) { |
b3b94faa DT |
2029 | if (test_bit(x, &gl->gl_flags)) |
2030 | printk(" %u", x); | |
85d1da67 | 2031 | } |
b3b94faa | 2032 | printk(" \n"); |
16feb9fe | 2033 | printk(KERN_INFO " gl_ref = %d\n", atomic_read(&gl->gl_ref)); |
d92a8d48 | 2034 | printk(KERN_INFO " gl_state = %u\n", gl->gl_state); |
320dd101 SW |
2035 | printk(KERN_INFO " gl_owner = %s\n", gl->gl_owner->comm); |
2036 | print_symbol(KERN_INFO " gl_ip = %s\n", gl->gl_ip); | |
d92a8d48 SW |
2037 | printk(KERN_INFO " req_gh = %s\n", (gl->gl_req_gh) ? "yes" : "no"); |
2038 | printk(KERN_INFO " req_bh = %s\n", (gl->gl_req_bh) ? "yes" : "no"); | |
2039 | printk(KERN_INFO " lvb_count = %d\n", atomic_read(&gl->gl_lvb_count)); | |
2040 | printk(KERN_INFO " object = %s\n", (gl->gl_object) ? "yes" : "no"); | |
2041 | printk(KERN_INFO " le = %s\n", | |
b3b94faa | 2042 | (list_empty(&gl->gl_le.le_list)) ? "no" : "yes"); |
d92a8d48 | 2043 | printk(KERN_INFO " reclaim = %s\n", |
b3b94faa DT |
2044 | (list_empty(&gl->gl_reclaim)) ? "no" : "yes"); |
2045 | if (gl->gl_aspace) | |
85d1da67 | 2046 | printk(KERN_INFO " aspace = 0x%p nrpages = %lu\n", gl->gl_aspace, |
88721877 | 2047 | gl->gl_aspace->i_mapping->nrpages); |
b3b94faa | 2048 | else |
d92a8d48 SW |
2049 | printk(KERN_INFO " aspace = no\n"); |
2050 | printk(KERN_INFO " ail = %d\n", atomic_read(&gl->gl_ail_count)); | |
b3b94faa DT |
2051 | if (gl->gl_req_gh) { |
2052 | error = dump_holder("Request", gl->gl_req_gh); | |
2053 | if (error) | |
2054 | goto out; | |
2055 | } | |
2056 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
2057 | error = dump_holder("Holder", gh); | |
2058 | if (error) | |
2059 | goto out; | |
2060 | } | |
2061 | list_for_each_entry(gh, &gl->gl_waiters1, gh_list) { | |
2062 | error = dump_holder("Waiter1", gh); | |
2063 | if (error) | |
2064 | goto out; | |
2065 | } | |
2066 | list_for_each_entry(gh, &gl->gl_waiters2, gh_list) { | |
2067 | error = dump_holder("Waiter2", gh); | |
2068 | if (error) | |
2069 | goto out; | |
2070 | } | |
2071 | list_for_each_entry(gh, &gl->gl_waiters3, gh_list) { | |
2072 | error = dump_holder("Waiter3", gh); | |
2073 | if (error) | |
2074 | goto out; | |
2075 | } | |
5c676f6d | 2076 | if (gl->gl_ops == &gfs2_inode_glops && gl->gl_object) { |
b3b94faa DT |
2077 | if (!test_bit(GLF_LOCK, &gl->gl_flags) && |
2078 | list_empty(&gl->gl_holders)) { | |
5c676f6d | 2079 | error = dump_inode(gl->gl_object); |
b3b94faa DT |
2080 | if (error) |
2081 | goto out; | |
2082 | } else { | |
2083 | error = -ENOBUFS; | |
d92a8d48 | 2084 | printk(KERN_INFO " Inode: busy\n"); |
b3b94faa DT |
2085 | } |
2086 | } | |
2087 | ||
2088 | error = 0; | |
2089 | ||
a91ea69f | 2090 | out: |
b3b94faa | 2091 | spin_unlock(&gl->gl_spin); |
b3b94faa DT |
2092 | return error; |
2093 | } | |
2094 | ||
2095 | /** | |
2096 | * gfs2_dump_lockstate - print out the current lockstate | |
2097 | * @sdp: the filesystem | |
2098 | * @ub: the buffer to copy the information into | |
2099 | * | |
2100 | * If @ub is NULL, dump the lockstate to the console. | |
2101 | * | |
2102 | */ | |
2103 | ||
08bc2dbc | 2104 | static int gfs2_dump_lockstate(struct gfs2_sbd *sdp) |
b3b94faa | 2105 | { |
b3b94faa | 2106 | struct gfs2_glock *gl; |
b6397893 | 2107 | struct hlist_node *h; |
b3b94faa DT |
2108 | unsigned int x; |
2109 | int error = 0; | |
2110 | ||
2111 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) { | |
b3b94faa | 2112 | |
087efdd3 | 2113 | read_lock(gl_lock_addr(x)); |
b3b94faa | 2114 | |
b6397893 | 2115 | hlist_for_each_entry(gl, h, &gl_hash_table[x].hb_list, gl_list) { |
85d1da67 SW |
2116 | if (gl->gl_sbd != sdp) |
2117 | continue; | |
b3b94faa DT |
2118 | |
2119 | error = dump_glock(gl); | |
2120 | if (error) | |
2121 | break; | |
2122 | } | |
2123 | ||
087efdd3 | 2124 | read_unlock(gl_lock_addr(x)); |
b3b94faa DT |
2125 | |
2126 | if (error) | |
2127 | break; | |
2128 | } | |
2129 | ||
2130 | ||
2131 | return error; | |
2132 | } | |
2133 | ||
85d1da67 SW |
2134 | int __init gfs2_glock_init(void) |
2135 | { | |
2136 | unsigned i; | |
2137 | for(i = 0; i < GFS2_GL_HASH_SIZE; i++) { | |
b6397893 | 2138 | INIT_HLIST_HEAD(&gl_hash_table[i].hb_list); |
85d1da67 | 2139 | } |
087efdd3 SW |
2140 | #ifdef GL_HASH_LOCK_SZ |
2141 | for(i = 0; i < GL_HASH_LOCK_SZ; i++) { | |
2142 | rwlock_init(&gl_hash_locks[i]); | |
2143 | } | |
2144 | #endif | |
85d1da67 SW |
2145 | return 0; |
2146 | } | |
2147 |