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 */ | |
99 | static inline rwlock_t *gl_lock_addr(x) | |
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 | ||
af18ddb8 SW |
772 | new_gh = gfs2_holder_get(gl, state, LM_FLAG_TRY, GFP_KERNEL); |
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 | ||
feaa7bba SW |
788 | void gfs2_glock_inode_squish(struct inode *inode) |
789 | { | |
790 | struct gfs2_holder gh; | |
791 | struct gfs2_glock *gl = GFS2_I(inode)->i_gl; | |
792 | gfs2_holder_init(gl, LM_ST_UNLOCKED, 0, &gh); | |
793 | set_bit(HIF_DEMOTE, &gh.gh_iflags); | |
794 | spin_lock(&gl->gl_spin); | |
795 | gfs2_assert(inode->i_sb->s_fs_info, list_empty(&gl->gl_holders)); | |
796 | list_add_tail(&gh.gh_list, &gl->gl_waiters2); | |
797 | run_queue(gl); | |
798 | spin_unlock(&gl->gl_spin); | |
5dd9feaf | 799 | wait_for_completion(&gh.gh_wait); |
feaa7bba SW |
800 | gfs2_holder_uninit(&gh); |
801 | } | |
802 | ||
b3b94faa DT |
803 | /** |
804 | * state_change - record that the glock is now in a different state | |
805 | * @gl: the glock | |
806 | * @new_state the new state | |
807 | * | |
808 | */ | |
809 | ||
810 | static void state_change(struct gfs2_glock *gl, unsigned int new_state) | |
811 | { | |
b3b94faa DT |
812 | int held1, held2; |
813 | ||
814 | held1 = (gl->gl_state != LM_ST_UNLOCKED); | |
815 | held2 = (new_state != LM_ST_UNLOCKED); | |
816 | ||
817 | if (held1 != held2) { | |
6a6b3d01 | 818 | if (held2) |
b3b94faa | 819 | gfs2_glock_hold(gl); |
6a6b3d01 | 820 | else |
b3b94faa | 821 | gfs2_glock_put(gl); |
b3b94faa DT |
822 | } |
823 | ||
824 | gl->gl_state = new_state; | |
825 | } | |
826 | ||
827 | /** | |
828 | * xmote_bh - Called after the lock module is done acquiring a lock | |
829 | * @gl: The glock in question | |
830 | * @ret: the int returned from the lock module | |
831 | * | |
832 | */ | |
833 | ||
834 | static void xmote_bh(struct gfs2_glock *gl, unsigned int ret) | |
835 | { | |
836 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 837 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
838 | struct gfs2_holder *gh = gl->gl_req_gh; |
839 | int prev_state = gl->gl_state; | |
840 | int op_done = 1; | |
841 | ||
842 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
843 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
844 | gfs2_assert_warn(sdp, !(ret & LM_OUT_ASYNC)); | |
845 | ||
846 | state_change(gl, ret & LM_OUT_ST_MASK); | |
847 | ||
848 | if (prev_state != LM_ST_UNLOCKED && !(ret & LM_OUT_CACHEABLE)) { | |
849 | if (glops->go_inval) | |
850 | glops->go_inval(gl, DIO_METADATA | DIO_DATA); | |
851 | } else if (gl->gl_state == LM_ST_DEFERRED) { | |
852 | /* We might not want to do this here. | |
853 | Look at moving to the inode glops. */ | |
854 | if (glops->go_inval) | |
855 | glops->go_inval(gl, DIO_DATA); | |
856 | } | |
857 | ||
858 | /* Deal with each possible exit condition */ | |
859 | ||
860 | if (!gh) | |
861 | gl->gl_stamp = jiffies; | |
b3b94faa DT |
862 | else if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) { |
863 | spin_lock(&gl->gl_spin); | |
864 | list_del_init(&gh->gh_list); | |
865 | gh->gh_error = -EIO; | |
b3b94faa | 866 | spin_unlock(&gl->gl_spin); |
b3b94faa DT |
867 | } else if (test_bit(HIF_DEMOTE, &gh->gh_iflags)) { |
868 | spin_lock(&gl->gl_spin); | |
869 | list_del_init(&gh->gh_list); | |
870 | if (gl->gl_state == gh->gh_state || | |
85d1da67 | 871 | gl->gl_state == LM_ST_UNLOCKED) { |
b3b94faa | 872 | gh->gh_error = 0; |
85d1da67 | 873 | } else { |
b3b94faa DT |
874 | if (gfs2_assert_warn(sdp, gh->gh_flags & |
875 | (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) == -1) | |
876 | fs_warn(sdp, "ret = 0x%.8X\n", ret); | |
877 | gh->gh_error = GLR_TRYFAILED; | |
878 | } | |
879 | spin_unlock(&gl->gl_spin); | |
880 | ||
881 | if (ret & LM_OUT_CANCELED) | |
50299965 | 882 | handle_callback(gl, LM_ST_UNLOCKED); |
b3b94faa DT |
883 | |
884 | } else if (ret & LM_OUT_CANCELED) { | |
885 | spin_lock(&gl->gl_spin); | |
886 | list_del_init(&gh->gh_list); | |
887 | gh->gh_error = GLR_CANCELED; | |
b3b94faa DT |
888 | spin_unlock(&gl->gl_spin); |
889 | ||
890 | } else if (relaxed_state_ok(gl->gl_state, gh->gh_state, gh->gh_flags)) { | |
891 | spin_lock(&gl->gl_spin); | |
892 | list_move_tail(&gh->gh_list, &gl->gl_holders); | |
893 | gh->gh_error = 0; | |
894 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
895 | spin_unlock(&gl->gl_spin); | |
896 | ||
897 | set_bit(HIF_FIRST, &gh->gh_iflags); | |
898 | ||
899 | op_done = 0; | |
900 | ||
901 | } else if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { | |
902 | spin_lock(&gl->gl_spin); | |
903 | list_del_init(&gh->gh_list); | |
904 | gh->gh_error = GLR_TRYFAILED; | |
b3b94faa DT |
905 | spin_unlock(&gl->gl_spin); |
906 | ||
907 | } else { | |
908 | if (gfs2_assert_withdraw(sdp, 0) == -1) | |
909 | fs_err(sdp, "ret = 0x%.8X\n", ret); | |
910 | } | |
911 | ||
912 | if (glops->go_xmote_bh) | |
913 | glops->go_xmote_bh(gl); | |
914 | ||
915 | if (op_done) { | |
916 | spin_lock(&gl->gl_spin); | |
917 | gl->gl_req_gh = NULL; | |
918 | gl->gl_req_bh = NULL; | |
919 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
920 | run_queue(gl); | |
921 | spin_unlock(&gl->gl_spin); | |
922 | } | |
923 | ||
924 | gfs2_glock_put(gl); | |
925 | ||
926 | if (gh) { | |
927 | if (test_bit(HIF_DEALLOC, &gh->gh_iflags)) | |
928 | gfs2_holder_put(gh); | |
929 | else | |
930 | complete(&gh->gh_wait); | |
931 | } | |
932 | } | |
933 | ||
934 | /** | |
935 | * gfs2_glock_xmote_th - Call into the lock module to acquire or change a glock | |
936 | * @gl: The glock in question | |
937 | * @state: the requested state | |
938 | * @flags: modifier flags to the lock call | |
939 | * | |
940 | */ | |
941 | ||
942 | void gfs2_glock_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags) | |
943 | { | |
944 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 945 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
946 | int lck_flags = flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB | |
947 | LM_FLAG_NOEXP | LM_FLAG_ANY | | |
948 | LM_FLAG_PRIORITY); | |
949 | unsigned int lck_ret; | |
950 | ||
951 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
952 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
953 | gfs2_assert_warn(sdp, state != LM_ST_UNLOCKED); | |
954 | gfs2_assert_warn(sdp, state != gl->gl_state); | |
955 | ||
50299965 SW |
956 | if (gl->gl_state == LM_ST_EXCLUSIVE && glops->go_sync) |
957 | glops->go_sync(gl, DIO_METADATA | DIO_DATA | DIO_RELEASE); | |
b3b94faa DT |
958 | |
959 | gfs2_glock_hold(gl); | |
960 | gl->gl_req_bh = xmote_bh; | |
961 | ||
ec45d9f5 | 962 | lck_ret = gfs2_lm_lock(sdp, gl->gl_lock, gl->gl_state, state, lck_flags); |
b3b94faa DT |
963 | |
964 | if (gfs2_assert_withdraw(sdp, !(lck_ret & LM_OUT_ERROR))) | |
965 | return; | |
966 | ||
967 | if (lck_ret & LM_OUT_ASYNC) | |
968 | gfs2_assert_warn(sdp, lck_ret == LM_OUT_ASYNC); | |
969 | else | |
970 | xmote_bh(gl, lck_ret); | |
971 | } | |
972 | ||
973 | /** | |
974 | * drop_bh - Called after a lock module unlock completes | |
975 | * @gl: the glock | |
976 | * @ret: the return status | |
977 | * | |
978 | * Doesn't wake up the process waiting on the struct gfs2_holder (if any) | |
979 | * Doesn't drop the reference on the glock the top half took out | |
980 | * | |
981 | */ | |
982 | ||
983 | static void drop_bh(struct gfs2_glock *gl, unsigned int ret) | |
984 | { | |
985 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 986 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
987 | struct gfs2_holder *gh = gl->gl_req_gh; |
988 | ||
989 | clear_bit(GLF_PREFETCH, &gl->gl_flags); | |
990 | ||
991 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
992 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
993 | gfs2_assert_warn(sdp, !ret); | |
994 | ||
995 | state_change(gl, LM_ST_UNLOCKED); | |
996 | ||
997 | if (glops->go_inval) | |
998 | glops->go_inval(gl, DIO_METADATA | DIO_DATA); | |
999 | ||
1000 | if (gh) { | |
1001 | spin_lock(&gl->gl_spin); | |
1002 | list_del_init(&gh->gh_list); | |
1003 | gh->gh_error = 0; | |
1004 | spin_unlock(&gl->gl_spin); | |
1005 | } | |
1006 | ||
1007 | if (glops->go_drop_bh) | |
1008 | glops->go_drop_bh(gl); | |
1009 | ||
1010 | spin_lock(&gl->gl_spin); | |
1011 | gl->gl_req_gh = NULL; | |
1012 | gl->gl_req_bh = NULL; | |
1013 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
1014 | run_queue(gl); | |
1015 | spin_unlock(&gl->gl_spin); | |
1016 | ||
1017 | gfs2_glock_put(gl); | |
1018 | ||
1019 | if (gh) { | |
1020 | if (test_bit(HIF_DEALLOC, &gh->gh_iflags)) | |
1021 | gfs2_holder_put(gh); | |
1022 | else | |
1023 | complete(&gh->gh_wait); | |
1024 | } | |
1025 | } | |
1026 | ||
1027 | /** | |
1028 | * gfs2_glock_drop_th - call into the lock module to unlock a lock | |
1029 | * @gl: the glock | |
1030 | * | |
1031 | */ | |
1032 | ||
1033 | void gfs2_glock_drop_th(struct gfs2_glock *gl) | |
1034 | { | |
1035 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 1036 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
1037 | unsigned int ret; |
1038 | ||
1039 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
1040 | gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders)); | |
1041 | gfs2_assert_warn(sdp, gl->gl_state != LM_ST_UNLOCKED); | |
1042 | ||
50299965 SW |
1043 | if (gl->gl_state == LM_ST_EXCLUSIVE && glops->go_sync) |
1044 | glops->go_sync(gl, DIO_METADATA | DIO_DATA | DIO_RELEASE); | |
b3b94faa DT |
1045 | |
1046 | gfs2_glock_hold(gl); | |
1047 | gl->gl_req_bh = drop_bh; | |
1048 | ||
b3b94faa DT |
1049 | ret = gfs2_lm_unlock(sdp, gl->gl_lock, gl->gl_state); |
1050 | ||
1051 | if (gfs2_assert_withdraw(sdp, !(ret & LM_OUT_ERROR))) | |
1052 | return; | |
1053 | ||
1054 | if (!ret) | |
1055 | drop_bh(gl, ret); | |
1056 | else | |
1057 | gfs2_assert_warn(sdp, ret == LM_OUT_ASYNC); | |
1058 | } | |
1059 | ||
1060 | /** | |
1061 | * do_cancels - cancel requests for locks stuck waiting on an expire flag | |
1062 | * @gh: the LM_FLAG_PRIORITY holder waiting to acquire the lock | |
1063 | * | |
1064 | * Don't cancel GL_NOCANCEL requests. | |
1065 | */ | |
1066 | ||
1067 | static void do_cancels(struct gfs2_holder *gh) | |
1068 | { | |
1069 | struct gfs2_glock *gl = gh->gh_gl; | |
1070 | ||
1071 | spin_lock(&gl->gl_spin); | |
1072 | ||
1073 | while (gl->gl_req_gh != gh && | |
1074 | !test_bit(HIF_HOLDER, &gh->gh_iflags) && | |
1075 | !list_empty(&gh->gh_list)) { | |
50299965 SW |
1076 | if (gl->gl_req_bh && !(gl->gl_req_gh && |
1077 | (gl->gl_req_gh->gh_flags & GL_NOCANCEL))) { | |
b3b94faa DT |
1078 | spin_unlock(&gl->gl_spin); |
1079 | gfs2_lm_cancel(gl->gl_sbd, gl->gl_lock); | |
1080 | msleep(100); | |
1081 | spin_lock(&gl->gl_spin); | |
1082 | } else { | |
1083 | spin_unlock(&gl->gl_spin); | |
1084 | msleep(100); | |
1085 | spin_lock(&gl->gl_spin); | |
1086 | } | |
1087 | } | |
1088 | ||
1089 | spin_unlock(&gl->gl_spin); | |
1090 | } | |
1091 | ||
1092 | /** | |
1093 | * glock_wait_internal - wait on a glock acquisition | |
1094 | * @gh: the glock holder | |
1095 | * | |
1096 | * Returns: 0 on success | |
1097 | */ | |
1098 | ||
1099 | static int glock_wait_internal(struct gfs2_holder *gh) | |
1100 | { | |
1101 | struct gfs2_glock *gl = gh->gh_gl; | |
1102 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 1103 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
1104 | |
1105 | if (test_bit(HIF_ABORTED, &gh->gh_iflags)) | |
1106 | return -EIO; | |
1107 | ||
1108 | if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { | |
1109 | spin_lock(&gl->gl_spin); | |
1110 | if (gl->gl_req_gh != gh && | |
1111 | !test_bit(HIF_HOLDER, &gh->gh_iflags) && | |
1112 | !list_empty(&gh->gh_list)) { | |
1113 | list_del_init(&gh->gh_list); | |
1114 | gh->gh_error = GLR_TRYFAILED; | |
b3b94faa DT |
1115 | run_queue(gl); |
1116 | spin_unlock(&gl->gl_spin); | |
1117 | return gh->gh_error; | |
1118 | } | |
1119 | spin_unlock(&gl->gl_spin); | |
1120 | } | |
1121 | ||
1122 | if (gh->gh_flags & LM_FLAG_PRIORITY) | |
1123 | do_cancels(gh); | |
1124 | ||
1125 | wait_for_completion(&gh->gh_wait); | |
1126 | ||
1127 | if (gh->gh_error) | |
1128 | return gh->gh_error; | |
1129 | ||
1130 | gfs2_assert_withdraw(sdp, test_bit(HIF_HOLDER, &gh->gh_iflags)); | |
85d1da67 | 1131 | gfs2_assert_withdraw(sdp, relaxed_state_ok(gl->gl_state, gh->gh_state, |
b3b94faa DT |
1132 | gh->gh_flags)); |
1133 | ||
1134 | if (test_bit(HIF_FIRST, &gh->gh_iflags)) { | |
1135 | gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags)); | |
1136 | ||
1137 | if (glops->go_lock) { | |
1138 | gh->gh_error = glops->go_lock(gh); | |
1139 | if (gh->gh_error) { | |
1140 | spin_lock(&gl->gl_spin); | |
1141 | list_del_init(&gh->gh_list); | |
b3b94faa DT |
1142 | spin_unlock(&gl->gl_spin); |
1143 | } | |
1144 | } | |
1145 | ||
1146 | spin_lock(&gl->gl_spin); | |
1147 | gl->gl_req_gh = NULL; | |
1148 | gl->gl_req_bh = NULL; | |
1149 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
b3b94faa DT |
1150 | run_queue(gl); |
1151 | spin_unlock(&gl->gl_spin); | |
1152 | } | |
1153 | ||
1154 | return gh->gh_error; | |
1155 | } | |
1156 | ||
1157 | static inline struct gfs2_holder * | |
1158 | find_holder_by_owner(struct list_head *head, struct task_struct *owner) | |
1159 | { | |
1160 | struct gfs2_holder *gh; | |
1161 | ||
1162 | list_for_each_entry(gh, head, gh_list) { | |
1163 | if (gh->gh_owner == owner) | |
1164 | return gh; | |
1165 | } | |
1166 | ||
1167 | return NULL; | |
1168 | } | |
1169 | ||
b3b94faa DT |
1170 | /** |
1171 | * add_to_queue - Add a holder to the wait queue (but look for recursion) | |
1172 | * @gh: the holder structure to add | |
1173 | * | |
1174 | */ | |
1175 | ||
1176 | static void add_to_queue(struct gfs2_holder *gh) | |
1177 | { | |
1178 | struct gfs2_glock *gl = gh->gh_gl; | |
1179 | struct gfs2_holder *existing; | |
1180 | ||
190562bd SW |
1181 | BUG_ON(!gh->gh_owner); |
1182 | ||
b3b94faa DT |
1183 | existing = find_holder_by_owner(&gl->gl_holders, gh->gh_owner); |
1184 | if (existing) { | |
5965b1f4 | 1185 | print_symbol(KERN_WARNING "original: %s\n", existing->gh_ip); |
86384605 | 1186 | printk(KERN_INFO "pid : %d\n", existing->gh_owner->pid); |
907b9bce | 1187 | printk(KERN_INFO "lock type : %d lock state : %d\n", |
86384605 | 1188 | existing->gh_gl->gl_name.ln_type, existing->gh_gl->gl_state); |
5965b1f4 | 1189 | print_symbol(KERN_WARNING "new: %s\n", gh->gh_ip); |
86384605 | 1190 | printk(KERN_INFO "pid : %d\n", gh->gh_owner->pid); |
907b9bce | 1191 | printk(KERN_INFO "lock type : %d lock state : %d\n", |
86384605 | 1192 | gl->gl_name.ln_type, gl->gl_state); |
5965b1f4 | 1193 | BUG(); |
b3b94faa DT |
1194 | } |
1195 | ||
1196 | existing = find_holder_by_owner(&gl->gl_waiters3, gh->gh_owner); | |
1197 | if (existing) { | |
5965b1f4 SW |
1198 | print_symbol(KERN_WARNING "original: %s\n", existing->gh_ip); |
1199 | print_symbol(KERN_WARNING "new: %s\n", gh->gh_ip); | |
1200 | BUG(); | |
b3b94faa DT |
1201 | } |
1202 | ||
b3b94faa DT |
1203 | if (gh->gh_flags & LM_FLAG_PRIORITY) |
1204 | list_add(&gh->gh_list, &gl->gl_waiters3); | |
1205 | else | |
907b9bce | 1206 | list_add_tail(&gh->gh_list, &gl->gl_waiters3); |
b3b94faa DT |
1207 | } |
1208 | ||
1209 | /** | |
1210 | * gfs2_glock_nq - enqueue a struct gfs2_holder onto a glock (acquire a glock) | |
1211 | * @gh: the holder structure | |
1212 | * | |
1213 | * if (gh->gh_flags & GL_ASYNC), this never returns an error | |
1214 | * | |
1215 | * Returns: 0, GLR_TRYFAILED, or errno on failure | |
1216 | */ | |
1217 | ||
1218 | int gfs2_glock_nq(struct gfs2_holder *gh) | |
1219 | { | |
1220 | struct gfs2_glock *gl = gh->gh_gl; | |
1221 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1222 | int error = 0; | |
1223 | ||
320dd101 | 1224 | restart: |
b3b94faa DT |
1225 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) { |
1226 | set_bit(HIF_ABORTED, &gh->gh_iflags); | |
1227 | return -EIO; | |
1228 | } | |
1229 | ||
1230 | set_bit(HIF_PROMOTE, &gh->gh_iflags); | |
1231 | ||
1232 | spin_lock(&gl->gl_spin); | |
1233 | add_to_queue(gh); | |
1234 | run_queue(gl); | |
1235 | spin_unlock(&gl->gl_spin); | |
1236 | ||
1237 | if (!(gh->gh_flags & GL_ASYNC)) { | |
1238 | error = glock_wait_internal(gh); | |
1239 | if (error == GLR_CANCELED) { | |
190562bd | 1240 | msleep(100); |
b3b94faa DT |
1241 | goto restart; |
1242 | } | |
1243 | } | |
1244 | ||
1245 | clear_bit(GLF_PREFETCH, &gl->gl_flags); | |
1246 | ||
320dd101 SW |
1247 | if (error == GLR_TRYFAILED && (gh->gh_flags & GL_DUMP)) |
1248 | dump_glock(gl); | |
1249 | ||
b3b94faa DT |
1250 | return error; |
1251 | } | |
1252 | ||
1253 | /** | |
1254 | * gfs2_glock_poll - poll to see if an async request has been completed | |
1255 | * @gh: the holder | |
1256 | * | |
1257 | * Returns: 1 if the request is ready to be gfs2_glock_wait()ed on | |
1258 | */ | |
1259 | ||
1260 | int gfs2_glock_poll(struct gfs2_holder *gh) | |
1261 | { | |
1262 | struct gfs2_glock *gl = gh->gh_gl; | |
1263 | int ready = 0; | |
1264 | ||
1265 | spin_lock(&gl->gl_spin); | |
1266 | ||
1267 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
1268 | ready = 1; | |
1269 | else if (list_empty(&gh->gh_list)) { | |
1270 | if (gh->gh_error == GLR_CANCELED) { | |
1271 | spin_unlock(&gl->gl_spin); | |
190562bd | 1272 | msleep(100); |
b3b94faa DT |
1273 | if (gfs2_glock_nq(gh)) |
1274 | return 1; | |
1275 | return 0; | |
1276 | } else | |
1277 | ready = 1; | |
1278 | } | |
1279 | ||
1280 | spin_unlock(&gl->gl_spin); | |
1281 | ||
1282 | return ready; | |
1283 | } | |
1284 | ||
1285 | /** | |
1286 | * gfs2_glock_wait - wait for a lock acquisition that ended in a GLR_ASYNC | |
1287 | * @gh: the holder structure | |
1288 | * | |
1289 | * Returns: 0, GLR_TRYFAILED, or errno on failure | |
1290 | */ | |
1291 | ||
1292 | int gfs2_glock_wait(struct gfs2_holder *gh) | |
1293 | { | |
1294 | int error; | |
1295 | ||
1296 | error = glock_wait_internal(gh); | |
1297 | if (error == GLR_CANCELED) { | |
190562bd | 1298 | msleep(100); |
b3b94faa DT |
1299 | gh->gh_flags &= ~GL_ASYNC; |
1300 | error = gfs2_glock_nq(gh); | |
1301 | } | |
1302 | ||
1303 | return error; | |
1304 | } | |
1305 | ||
1306 | /** | |
1307 | * gfs2_glock_dq - dequeue a struct gfs2_holder from a glock (release a glock) | |
1308 | * @gh: the glock holder | |
1309 | * | |
1310 | */ | |
1311 | ||
1312 | void gfs2_glock_dq(struct gfs2_holder *gh) | |
1313 | { | |
1314 | struct gfs2_glock *gl = gh->gh_gl; | |
8fb4b536 | 1315 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa | 1316 | |
b3b94faa DT |
1317 | if (gh->gh_flags & GL_NOCACHE) |
1318 | handle_callback(gl, LM_ST_UNLOCKED); | |
1319 | ||
1320 | gfs2_glmutex_lock(gl); | |
1321 | ||
1322 | spin_lock(&gl->gl_spin); | |
1323 | list_del_init(&gh->gh_list); | |
1324 | ||
1325 | if (list_empty(&gl->gl_holders)) { | |
1326 | spin_unlock(&gl->gl_spin); | |
1327 | ||
1328 | if (glops->go_unlock) | |
1329 | glops->go_unlock(gh); | |
1330 | ||
b3b94faa DT |
1331 | gl->gl_stamp = jiffies; |
1332 | ||
1333 | spin_lock(&gl->gl_spin); | |
1334 | } | |
1335 | ||
1336 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
1337 | run_queue(gl); | |
1338 | spin_unlock(&gl->gl_spin); | |
1339 | } | |
1340 | ||
1341 | /** | |
1342 | * gfs2_glock_prefetch - Try to prefetch a glock | |
1343 | * @gl: the glock | |
1344 | * @state: the state to prefetch in | |
1345 | * @flags: flags passed to go_xmote_th() | |
1346 | * | |
1347 | */ | |
1348 | ||
08bc2dbc AB |
1349 | static void gfs2_glock_prefetch(struct gfs2_glock *gl, unsigned int state, |
1350 | int flags) | |
b3b94faa | 1351 | { |
8fb4b536 | 1352 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
1353 | |
1354 | spin_lock(&gl->gl_spin); | |
1355 | ||
50299965 SW |
1356 | if (test_bit(GLF_LOCK, &gl->gl_flags) || !list_empty(&gl->gl_holders) || |
1357 | !list_empty(&gl->gl_waiters1) || !list_empty(&gl->gl_waiters2) || | |
b3b94faa DT |
1358 | !list_empty(&gl->gl_waiters3) || |
1359 | relaxed_state_ok(gl->gl_state, state, flags)) { | |
1360 | spin_unlock(&gl->gl_spin); | |
1361 | return; | |
1362 | } | |
1363 | ||
1364 | set_bit(GLF_PREFETCH, &gl->gl_flags); | |
1365 | set_bit(GLF_LOCK, &gl->gl_flags); | |
1366 | spin_unlock(&gl->gl_spin); | |
1367 | ||
1368 | glops->go_xmote_th(gl, state, flags); | |
b3b94faa DT |
1369 | } |
1370 | ||
c4028958 | 1371 | static void greedy_work(struct work_struct *work) |
b3b94faa | 1372 | { |
c4028958 | 1373 | struct greedy *gr = container_of(work, struct greedy, gr_work.work); |
b3b94faa DT |
1374 | struct gfs2_holder *gh = &gr->gr_gh; |
1375 | struct gfs2_glock *gl = gh->gh_gl; | |
8fb4b536 | 1376 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
1377 | |
1378 | clear_bit(GLF_SKIP_WAITERS2, &gl->gl_flags); | |
1379 | ||
1380 | if (glops->go_greedy) | |
1381 | glops->go_greedy(gl); | |
1382 | ||
1383 | spin_lock(&gl->gl_spin); | |
1384 | ||
1385 | if (list_empty(&gl->gl_waiters2)) { | |
1386 | clear_bit(GLF_GREEDY, &gl->gl_flags); | |
1387 | spin_unlock(&gl->gl_spin); | |
1388 | gfs2_holder_uninit(gh); | |
1389 | kfree(gr); | |
1390 | } else { | |
1391 | gfs2_glock_hold(gl); | |
1392 | list_add_tail(&gh->gh_list, &gl->gl_waiters2); | |
1393 | run_queue(gl); | |
1394 | spin_unlock(&gl->gl_spin); | |
1395 | gfs2_glock_put(gl); | |
1396 | } | |
1397 | } | |
1398 | ||
1399 | /** | |
1400 | * gfs2_glock_be_greedy - | |
1401 | * @gl: | |
1402 | * @time: | |
1403 | * | |
1404 | * Returns: 0 if go_greedy will be called, 1 otherwise | |
1405 | */ | |
1406 | ||
1407 | int gfs2_glock_be_greedy(struct gfs2_glock *gl, unsigned int time) | |
1408 | { | |
1409 | struct greedy *gr; | |
1410 | struct gfs2_holder *gh; | |
1411 | ||
feaa7bba | 1412 | if (!time || gl->gl_sbd->sd_args.ar_localcaching || |
b3b94faa DT |
1413 | test_and_set_bit(GLF_GREEDY, &gl->gl_flags)) |
1414 | return 1; | |
1415 | ||
1416 | gr = kmalloc(sizeof(struct greedy), GFP_KERNEL); | |
1417 | if (!gr) { | |
1418 | clear_bit(GLF_GREEDY, &gl->gl_flags); | |
1419 | return 1; | |
1420 | } | |
1421 | gh = &gr->gr_gh; | |
1422 | ||
579b78a4 | 1423 | gfs2_holder_init(gl, 0, 0, gh); |
b3b94faa | 1424 | set_bit(HIF_GREEDY, &gh->gh_iflags); |
c4028958 | 1425 | INIT_DELAYED_WORK(&gr->gr_work, greedy_work); |
b3b94faa DT |
1426 | |
1427 | set_bit(GLF_SKIP_WAITERS2, &gl->gl_flags); | |
1428 | schedule_delayed_work(&gr->gr_work, time); | |
1429 | ||
1430 | return 0; | |
1431 | } | |
1432 | ||
b3b94faa DT |
1433 | /** |
1434 | * gfs2_glock_dq_uninit - dequeue a holder from a glock and initialize it | |
1435 | * @gh: the holder structure | |
1436 | * | |
1437 | */ | |
1438 | ||
1439 | void gfs2_glock_dq_uninit(struct gfs2_holder *gh) | |
1440 | { | |
1441 | gfs2_glock_dq(gh); | |
1442 | gfs2_holder_uninit(gh); | |
1443 | } | |
1444 | ||
1445 | /** | |
1446 | * gfs2_glock_nq_num - acquire a glock based on lock number | |
1447 | * @sdp: the filesystem | |
1448 | * @number: the lock number | |
1449 | * @glops: the glock operations for the type of glock | |
1450 | * @state: the state to acquire the glock in | |
1451 | * @flags: modifier flags for the aquisition | |
1452 | * @gh: the struct gfs2_holder | |
1453 | * | |
1454 | * Returns: errno | |
1455 | */ | |
1456 | ||
cd915493 | 1457 | int gfs2_glock_nq_num(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 SW |
1458 | const struct gfs2_glock_operations *glops, |
1459 | unsigned int state, int flags, struct gfs2_holder *gh) | |
b3b94faa DT |
1460 | { |
1461 | struct gfs2_glock *gl; | |
1462 | int error; | |
1463 | ||
1464 | error = gfs2_glock_get(sdp, number, glops, CREATE, &gl); | |
1465 | if (!error) { | |
1466 | error = gfs2_glock_nq_init(gl, state, flags, gh); | |
1467 | gfs2_glock_put(gl); | |
1468 | } | |
1469 | ||
1470 | return error; | |
1471 | } | |
1472 | ||
1473 | /** | |
1474 | * glock_compare - Compare two struct gfs2_glock structures for sorting | |
1475 | * @arg_a: the first structure | |
1476 | * @arg_b: the second structure | |
1477 | * | |
1478 | */ | |
1479 | ||
1480 | static int glock_compare(const void *arg_a, const void *arg_b) | |
1481 | { | |
a5e08a9e SW |
1482 | const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a; |
1483 | const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b; | |
1484 | const struct lm_lockname *a = &gh_a->gh_gl->gl_name; | |
1485 | const struct lm_lockname *b = &gh_b->gh_gl->gl_name; | |
b3b94faa DT |
1486 | |
1487 | if (a->ln_number > b->ln_number) | |
a5e08a9e SW |
1488 | return 1; |
1489 | if (a->ln_number < b->ln_number) | |
1490 | return -1; | |
1491 | if (gh_a->gh_state == LM_ST_SHARED && gh_b->gh_state == LM_ST_EXCLUSIVE) | |
1492 | return 1; | |
1493 | if (!(gh_a->gh_flags & GL_LOCAL_EXCL) && (gh_b->gh_flags & GL_LOCAL_EXCL)) | |
1494 | return 1; | |
1495 | return 0; | |
b3b94faa DT |
1496 | } |
1497 | ||
1498 | /** | |
1499 | * nq_m_sync - synchonously acquire more than one glock in deadlock free order | |
1500 | * @num_gh: the number of structures | |
1501 | * @ghs: an array of struct gfs2_holder structures | |
1502 | * | |
1503 | * Returns: 0 on success (all glocks acquired), | |
1504 | * errno on failure (no glocks acquired) | |
1505 | */ | |
1506 | ||
1507 | static int nq_m_sync(unsigned int num_gh, struct gfs2_holder *ghs, | |
1508 | struct gfs2_holder **p) | |
1509 | { | |
1510 | unsigned int x; | |
1511 | int error = 0; | |
1512 | ||
1513 | for (x = 0; x < num_gh; x++) | |
1514 | p[x] = &ghs[x]; | |
1515 | ||
1516 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare, NULL); | |
1517 | ||
1518 | for (x = 0; x < num_gh; x++) { | |
1519 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1520 | ||
1521 | error = gfs2_glock_nq(p[x]); | |
1522 | if (error) { | |
1523 | while (x--) | |
1524 | gfs2_glock_dq(p[x]); | |
1525 | break; | |
1526 | } | |
1527 | } | |
1528 | ||
1529 | return error; | |
1530 | } | |
1531 | ||
1532 | /** | |
1533 | * gfs2_glock_nq_m - acquire multiple glocks | |
1534 | * @num_gh: the number of structures | |
1535 | * @ghs: an array of struct gfs2_holder structures | |
1536 | * | |
1537 | * Figure out how big an impact this function has. Either: | |
1538 | * 1) Replace this code with code that calls gfs2_glock_prefetch() | |
1539 | * 2) Forget async stuff and just call nq_m_sync() | |
1540 | * 3) Leave it like it is | |
1541 | * | |
1542 | * Returns: 0 on success (all glocks acquired), | |
1543 | * errno on failure (no glocks acquired) | |
1544 | */ | |
1545 | ||
1546 | int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1547 | { | |
1548 | int *e; | |
1549 | unsigned int x; | |
1550 | int borked = 0, serious = 0; | |
1551 | int error = 0; | |
1552 | ||
1553 | if (!num_gh) | |
1554 | return 0; | |
1555 | ||
1556 | if (num_gh == 1) { | |
1557 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1558 | return gfs2_glock_nq(ghs); | |
1559 | } | |
1560 | ||
1561 | e = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL); | |
1562 | if (!e) | |
1563 | return -ENOMEM; | |
1564 | ||
1565 | for (x = 0; x < num_gh; x++) { | |
1566 | ghs[x].gh_flags |= LM_FLAG_TRY | GL_ASYNC; | |
1567 | error = gfs2_glock_nq(&ghs[x]); | |
1568 | if (error) { | |
1569 | borked = 1; | |
1570 | serious = error; | |
1571 | num_gh = x; | |
1572 | break; | |
1573 | } | |
1574 | } | |
1575 | ||
1576 | for (x = 0; x < num_gh; x++) { | |
1577 | error = e[x] = glock_wait_internal(&ghs[x]); | |
1578 | if (error) { | |
1579 | borked = 1; | |
1580 | if (error != GLR_TRYFAILED && error != GLR_CANCELED) | |
1581 | serious = error; | |
1582 | } | |
1583 | } | |
1584 | ||
1585 | if (!borked) { | |
1586 | kfree(e); | |
1587 | return 0; | |
1588 | } | |
1589 | ||
1590 | for (x = 0; x < num_gh; x++) | |
1591 | if (!e[x]) | |
1592 | gfs2_glock_dq(&ghs[x]); | |
1593 | ||
1594 | if (serious) | |
1595 | error = serious; | |
1596 | else { | |
1597 | for (x = 0; x < num_gh; x++) | |
1598 | gfs2_holder_reinit(ghs[x].gh_state, ghs[x].gh_flags, | |
1599 | &ghs[x]); | |
1600 | error = nq_m_sync(num_gh, ghs, (struct gfs2_holder **)e); | |
1601 | } | |
1602 | ||
1603 | kfree(e); | |
1604 | ||
1605 | return error; | |
1606 | } | |
1607 | ||
1608 | /** | |
1609 | * gfs2_glock_dq_m - release multiple glocks | |
1610 | * @num_gh: the number of structures | |
1611 | * @ghs: an array of struct gfs2_holder structures | |
1612 | * | |
1613 | */ | |
1614 | ||
1615 | void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1616 | { | |
1617 | unsigned int x; | |
1618 | ||
1619 | for (x = 0; x < num_gh; x++) | |
1620 | gfs2_glock_dq(&ghs[x]); | |
1621 | } | |
1622 | ||
1623 | /** | |
1624 | * gfs2_glock_dq_uninit_m - release multiple glocks | |
1625 | * @num_gh: the number of structures | |
1626 | * @ghs: an array of struct gfs2_holder structures | |
1627 | * | |
1628 | */ | |
1629 | ||
1630 | void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1631 | { | |
1632 | unsigned int x; | |
1633 | ||
1634 | for (x = 0; x < num_gh; x++) | |
1635 | gfs2_glock_dq_uninit(&ghs[x]); | |
1636 | } | |
1637 | ||
1638 | /** | |
1639 | * gfs2_glock_prefetch_num - prefetch a glock based on lock number | |
1640 | * @sdp: the filesystem | |
1641 | * @number: the lock number | |
1642 | * @glops: the glock operations for the type of glock | |
1643 | * @state: the state to acquire the glock in | |
1644 | * @flags: modifier flags for the aquisition | |
1645 | * | |
1646 | * Returns: errno | |
1647 | */ | |
1648 | ||
cd915493 | 1649 | void gfs2_glock_prefetch_num(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 | 1650 | const struct gfs2_glock_operations *glops, |
b3b94faa DT |
1651 | unsigned int state, int flags) |
1652 | { | |
1653 | struct gfs2_glock *gl; | |
1654 | int error; | |
1655 | ||
1656 | if (atomic_read(&sdp->sd_reclaim_count) < | |
1657 | gfs2_tune_get(sdp, gt_reclaim_limit)) { | |
1658 | error = gfs2_glock_get(sdp, number, glops, CREATE, &gl); | |
1659 | if (!error) { | |
1660 | gfs2_glock_prefetch(gl, state, flags); | |
1661 | gfs2_glock_put(gl); | |
1662 | } | |
1663 | } | |
1664 | } | |
1665 | ||
1666 | /** | |
1667 | * gfs2_lvb_hold - attach a LVB from a glock | |
1668 | * @gl: The glock in question | |
1669 | * | |
1670 | */ | |
1671 | ||
1672 | int gfs2_lvb_hold(struct gfs2_glock *gl) | |
1673 | { | |
1674 | int error; | |
1675 | ||
1676 | gfs2_glmutex_lock(gl); | |
1677 | ||
1678 | if (!atomic_read(&gl->gl_lvb_count)) { | |
1679 | error = gfs2_lm_hold_lvb(gl->gl_sbd, gl->gl_lock, &gl->gl_lvb); | |
1680 | if (error) { | |
1681 | gfs2_glmutex_unlock(gl); | |
1682 | return error; | |
1683 | } | |
1684 | gfs2_glock_hold(gl); | |
1685 | } | |
1686 | atomic_inc(&gl->gl_lvb_count); | |
1687 | ||
1688 | gfs2_glmutex_unlock(gl); | |
1689 | ||
1690 | return 0; | |
1691 | } | |
1692 | ||
1693 | /** | |
1694 | * gfs2_lvb_unhold - detach a LVB from a glock | |
1695 | * @gl: The glock in question | |
1696 | * | |
1697 | */ | |
1698 | ||
1699 | void gfs2_lvb_unhold(struct gfs2_glock *gl) | |
1700 | { | |
1701 | gfs2_glock_hold(gl); | |
1702 | gfs2_glmutex_lock(gl); | |
1703 | ||
1704 | gfs2_assert(gl->gl_sbd, atomic_read(&gl->gl_lvb_count) > 0); | |
1705 | if (atomic_dec_and_test(&gl->gl_lvb_count)) { | |
1706 | gfs2_lm_unhold_lvb(gl->gl_sbd, gl->gl_lock, gl->gl_lvb); | |
1707 | gl->gl_lvb = NULL; | |
1708 | gfs2_glock_put(gl); | |
1709 | } | |
1710 | ||
1711 | gfs2_glmutex_unlock(gl); | |
1712 | gfs2_glock_put(gl); | |
1713 | } | |
1714 | ||
b3b94faa DT |
1715 | static void blocking_cb(struct gfs2_sbd *sdp, struct lm_lockname *name, |
1716 | unsigned int state) | |
1717 | { | |
1718 | struct gfs2_glock *gl; | |
1719 | ||
1720 | gl = gfs2_glock_find(sdp, name); | |
1721 | if (!gl) | |
1722 | return; | |
1723 | ||
1724 | if (gl->gl_ops->go_callback) | |
1725 | gl->gl_ops->go_callback(gl, state); | |
1726 | handle_callback(gl, state); | |
1727 | ||
1728 | spin_lock(&gl->gl_spin); | |
1729 | run_queue(gl); | |
1730 | spin_unlock(&gl->gl_spin); | |
1731 | ||
1732 | gfs2_glock_put(gl); | |
1733 | } | |
1734 | ||
1735 | /** | |
1736 | * gfs2_glock_cb - Callback used by locking module | |
1c089c32 | 1737 | * @sdp: Pointer to the superblock |
b3b94faa DT |
1738 | * @type: Type of callback |
1739 | * @data: Type dependent data pointer | |
1740 | * | |
1741 | * Called by the locking module when it wants to tell us something. | |
1742 | * Either we need to drop a lock, one of our ASYNC requests completed, or | |
1743 | * a journal from another client needs to be recovered. | |
1744 | */ | |
1745 | ||
9b47c11d | 1746 | void gfs2_glock_cb(void *cb_data, unsigned int type, void *data) |
b3b94faa | 1747 | { |
9b47c11d | 1748 | struct gfs2_sbd *sdp = cb_data; |
b3b94faa | 1749 | |
b3b94faa DT |
1750 | switch (type) { |
1751 | case LM_CB_NEED_E: | |
e7f5c01c | 1752 | blocking_cb(sdp, data, LM_ST_UNLOCKED); |
b3b94faa DT |
1753 | return; |
1754 | ||
1755 | case LM_CB_NEED_D: | |
e7f5c01c | 1756 | blocking_cb(sdp, data, LM_ST_DEFERRED); |
b3b94faa DT |
1757 | return; |
1758 | ||
1759 | case LM_CB_NEED_S: | |
e7f5c01c | 1760 | blocking_cb(sdp, data, LM_ST_SHARED); |
b3b94faa DT |
1761 | return; |
1762 | ||
1763 | case LM_CB_ASYNC: { | |
e7f5c01c | 1764 | struct lm_async_cb *async = data; |
b3b94faa DT |
1765 | struct gfs2_glock *gl; |
1766 | ||
1767 | gl = gfs2_glock_find(sdp, &async->lc_name); | |
1768 | if (gfs2_assert_warn(sdp, gl)) | |
1769 | return; | |
1770 | if (!gfs2_assert_warn(sdp, gl->gl_req_bh)) | |
1771 | gl->gl_req_bh(gl, async->lc_ret); | |
1772 | gfs2_glock_put(gl); | |
b3b94faa DT |
1773 | return; |
1774 | } | |
1775 | ||
1776 | case LM_CB_NEED_RECOVERY: | |
1777 | gfs2_jdesc_make_dirty(sdp, *(unsigned int *)data); | |
1778 | if (sdp->sd_recoverd_process) | |
1779 | wake_up_process(sdp->sd_recoverd_process); | |
1780 | return; | |
1781 | ||
1782 | case LM_CB_DROPLOCKS: | |
1783 | gfs2_gl_hash_clear(sdp, NO_WAIT); | |
1784 | gfs2_quota_scan(sdp); | |
1785 | return; | |
1786 | ||
1787 | default: | |
1788 | gfs2_assert_warn(sdp, 0); | |
1789 | return; | |
1790 | } | |
1791 | } | |
1792 | ||
b3b94faa DT |
1793 | /** |
1794 | * demote_ok - Check to see if it's ok to unlock a glock | |
1795 | * @gl: the glock | |
1796 | * | |
1797 | * Returns: 1 if it's ok | |
1798 | */ | |
1799 | ||
1800 | static int demote_ok(struct gfs2_glock *gl) | |
1801 | { | |
1802 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
8fb4b536 | 1803 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
b3b94faa DT |
1804 | int demote = 1; |
1805 | ||
1806 | if (test_bit(GLF_STICKY, &gl->gl_flags)) | |
1807 | demote = 0; | |
1808 | else if (test_bit(GLF_PREFETCH, &gl->gl_flags)) | |
50299965 | 1809 | demote = time_after_eq(jiffies, gl->gl_stamp + |
b3b94faa DT |
1810 | gfs2_tune_get(sdp, gt_prefetch_secs) * HZ); |
1811 | else if (glops->go_demote_ok) | |
1812 | demote = glops->go_demote_ok(gl); | |
1813 | ||
1814 | return demote; | |
1815 | } | |
1816 | ||
1817 | /** | |
1818 | * gfs2_glock_schedule_for_reclaim - Add a glock to the reclaim list | |
1819 | * @gl: the glock | |
1820 | * | |
1821 | */ | |
1822 | ||
1823 | void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl) | |
1824 | { | |
1825 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1826 | ||
1827 | spin_lock(&sdp->sd_reclaim_lock); | |
1828 | if (list_empty(&gl->gl_reclaim)) { | |
1829 | gfs2_glock_hold(gl); | |
1830 | list_add(&gl->gl_reclaim, &sdp->sd_reclaim_list); | |
1831 | atomic_inc(&sdp->sd_reclaim_count); | |
1832 | } | |
1833 | spin_unlock(&sdp->sd_reclaim_lock); | |
1834 | ||
1835 | wake_up(&sdp->sd_reclaim_wq); | |
1836 | } | |
1837 | ||
1838 | /** | |
1839 | * gfs2_reclaim_glock - process the next glock on the filesystem's reclaim list | |
1840 | * @sdp: the filesystem | |
1841 | * | |
1842 | * Called from gfs2_glockd() glock reclaim daemon, or when promoting a | |
1843 | * different glock and we notice that there are a lot of glocks in the | |
1844 | * reclaim list. | |
1845 | * | |
1846 | */ | |
1847 | ||
1848 | void gfs2_reclaim_glock(struct gfs2_sbd *sdp) | |
1849 | { | |
1850 | struct gfs2_glock *gl; | |
1851 | ||
1852 | spin_lock(&sdp->sd_reclaim_lock); | |
1853 | if (list_empty(&sdp->sd_reclaim_list)) { | |
1854 | spin_unlock(&sdp->sd_reclaim_lock); | |
1855 | return; | |
1856 | } | |
1857 | gl = list_entry(sdp->sd_reclaim_list.next, | |
1858 | struct gfs2_glock, gl_reclaim); | |
1859 | list_del_init(&gl->gl_reclaim); | |
1860 | spin_unlock(&sdp->sd_reclaim_lock); | |
1861 | ||
1862 | atomic_dec(&sdp->sd_reclaim_count); | |
1863 | atomic_inc(&sdp->sd_reclaimed); | |
1864 | ||
1865 | if (gfs2_glmutex_trylock(gl)) { | |
b3b94faa | 1866 | if (queue_empty(gl, &gl->gl_holders) && |
50299965 | 1867 | gl->gl_state != LM_ST_UNLOCKED && demote_ok(gl)) |
b3b94faa DT |
1868 | handle_callback(gl, LM_ST_UNLOCKED); |
1869 | gfs2_glmutex_unlock(gl); | |
1870 | } | |
1871 | ||
1872 | gfs2_glock_put(gl); | |
1873 | } | |
1874 | ||
1875 | /** | |
1876 | * examine_bucket - Call a function for glock in a hash bucket | |
1877 | * @examiner: the function | |
1878 | * @sdp: the filesystem | |
1879 | * @bucket: the bucket | |
1880 | * | |
1881 | * Returns: 1 if the bucket has entries | |
1882 | */ | |
1883 | ||
1884 | static int examine_bucket(glock_examiner examiner, struct gfs2_sbd *sdp, | |
37b2fa6a | 1885 | unsigned int hash) |
b3b94faa | 1886 | { |
24264434 SW |
1887 | struct gfs2_glock *gl, *prev = NULL; |
1888 | int has_entries = 0; | |
b6397893 | 1889 | struct hlist_head *head = &gl_hash_table[hash].hb_list; |
b3b94faa | 1890 | |
24264434 | 1891 | read_lock(gl_lock_addr(hash)); |
b6397893 SW |
1892 | /* Can't use hlist_for_each_entry - don't want prefetch here */ |
1893 | if (hlist_empty(head)) | |
24264434 | 1894 | goto out; |
b6397893 SW |
1895 | gl = list_entry(head->first, struct gfs2_glock, gl_list); |
1896 | while(1) { | |
24264434 | 1897 | if (gl->gl_sbd == sdp) { |
b3b94faa | 1898 | gfs2_glock_hold(gl); |
24264434 SW |
1899 | read_unlock(gl_lock_addr(hash)); |
1900 | if (prev) | |
1901 | gfs2_glock_put(prev); | |
1902 | prev = gl; | |
1903 | examiner(gl); | |
a8336344 | 1904 | has_entries = 1; |
24264434 | 1905 | read_lock(gl_lock_addr(hash)); |
b3b94faa | 1906 | } |
b6397893 SW |
1907 | if (gl->gl_list.next == NULL) |
1908 | break; | |
24264434 | 1909 | gl = list_entry(gl->gl_list.next, struct gfs2_glock, gl_list); |
b3b94faa | 1910 | } |
24264434 SW |
1911 | out: |
1912 | read_unlock(gl_lock_addr(hash)); | |
1913 | if (prev) | |
1914 | gfs2_glock_put(prev); | |
1915 | return has_entries; | |
b3b94faa DT |
1916 | } |
1917 | ||
1918 | /** | |
1919 | * scan_glock - look at a glock and see if we can reclaim it | |
1920 | * @gl: the glock to look at | |
1921 | * | |
1922 | */ | |
1923 | ||
1924 | static void scan_glock(struct gfs2_glock *gl) | |
1925 | { | |
a2242db0 | 1926 | if (gl->gl_ops == &gfs2_inode_glops) |
24264434 | 1927 | return; |
a2242db0 | 1928 | |
b3b94faa | 1929 | if (gfs2_glmutex_trylock(gl)) { |
b3b94faa | 1930 | if (queue_empty(gl, &gl->gl_holders) && |
24264434 | 1931 | gl->gl_state != LM_ST_UNLOCKED && demote_ok(gl)) |
b3b94faa | 1932 | goto out_schedule; |
b3b94faa DT |
1933 | gfs2_glmutex_unlock(gl); |
1934 | } | |
b3b94faa DT |
1935 | return; |
1936 | ||
627add2d | 1937 | out_schedule: |
b3b94faa DT |
1938 | gfs2_glmutex_unlock(gl); |
1939 | gfs2_glock_schedule_for_reclaim(gl); | |
b3b94faa DT |
1940 | } |
1941 | ||
1942 | /** | |
1943 | * gfs2_scand_internal - Look for glocks and inodes to toss from memory | |
1944 | * @sdp: the filesystem | |
1945 | * | |
1946 | */ | |
1947 | ||
1948 | void gfs2_scand_internal(struct gfs2_sbd *sdp) | |
1949 | { | |
1950 | unsigned int x; | |
1951 | ||
94610610 | 1952 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) |
37b2fa6a | 1953 | examine_bucket(scan_glock, sdp, x); |
b3b94faa DT |
1954 | } |
1955 | ||
1956 | /** | |
1957 | * clear_glock - look at a glock and see if we can free it from glock cache | |
1958 | * @gl: the glock to look at | |
1959 | * | |
1960 | */ | |
1961 | ||
1962 | static void clear_glock(struct gfs2_glock *gl) | |
1963 | { | |
1964 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1965 | int released; | |
1966 | ||
1967 | spin_lock(&sdp->sd_reclaim_lock); | |
1968 | if (!list_empty(&gl->gl_reclaim)) { | |
1969 | list_del_init(&gl->gl_reclaim); | |
1970 | atomic_dec(&sdp->sd_reclaim_count); | |
190562bd | 1971 | spin_unlock(&sdp->sd_reclaim_lock); |
b3b94faa DT |
1972 | released = gfs2_glock_put(gl); |
1973 | gfs2_assert(sdp, !released); | |
190562bd SW |
1974 | } else { |
1975 | spin_unlock(&sdp->sd_reclaim_lock); | |
b3b94faa | 1976 | } |
b3b94faa DT |
1977 | |
1978 | if (gfs2_glmutex_trylock(gl)) { | |
b3b94faa DT |
1979 | if (queue_empty(gl, &gl->gl_holders) && |
1980 | gl->gl_state != LM_ST_UNLOCKED) | |
1981 | handle_callback(gl, LM_ST_UNLOCKED); | |
b3b94faa DT |
1982 | gfs2_glmutex_unlock(gl); |
1983 | } | |
b3b94faa DT |
1984 | } |
1985 | ||
1986 | /** | |
1987 | * gfs2_gl_hash_clear - Empty out the glock hash table | |
1988 | * @sdp: the filesystem | |
1989 | * @wait: wait until it's all gone | |
1990 | * | |
1991 | * Called when unmounting the filesystem, or when inter-node lock manager | |
1992 | * requests DROPLOCKS because it is running out of capacity. | |
1993 | */ | |
1994 | ||
1995 | void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait) | |
1996 | { | |
1997 | unsigned long t; | |
1998 | unsigned int x; | |
1999 | int cont; | |
2000 | ||
2001 | t = jiffies; | |
2002 | ||
2003 | for (;;) { | |
2004 | cont = 0; | |
24264434 | 2005 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) { |
907b9bce | 2006 | if (examine_bucket(clear_glock, sdp, x)) |
b3b94faa | 2007 | cont = 1; |
24264434 | 2008 | } |
b3b94faa DT |
2009 | |
2010 | if (!wait || !cont) | |
2011 | break; | |
2012 | ||
2013 | if (time_after_eq(jiffies, | |
2014 | t + gfs2_tune_get(sdp, gt_stall_secs) * HZ)) { | |
2015 | fs_warn(sdp, "Unmount seems to be stalled. " | |
2016 | "Dumping lock state...\n"); | |
2017 | gfs2_dump_lockstate(sdp); | |
2018 | t = jiffies; | |
2019 | } | |
2020 | ||
b3b94faa | 2021 | invalidate_inodes(sdp->sd_vfs); |
fd88de56 | 2022 | msleep(10); |
b3b94faa DT |
2023 | } |
2024 | } | |
2025 | ||
2026 | /* | |
2027 | * Diagnostic routines to help debug distributed deadlock | |
2028 | */ | |
2029 | ||
2030 | /** | |
2031 | * dump_holder - print information about a glock holder | |
2032 | * @str: a string naming the type of holder | |
2033 | * @gh: the glock holder | |
2034 | * | |
2035 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
2036 | */ | |
2037 | ||
2038 | static int dump_holder(char *str, struct gfs2_holder *gh) | |
2039 | { | |
2040 | unsigned int x; | |
2041 | int error = -ENOBUFS; | |
2042 | ||
d92a8d48 SW |
2043 | printk(KERN_INFO " %s\n", str); |
2044 | printk(KERN_INFO " owner = %ld\n", | |
b3b94faa | 2045 | (gh->gh_owner) ? (long)gh->gh_owner->pid : -1); |
d92a8d48 SW |
2046 | printk(KERN_INFO " gh_state = %u\n", gh->gh_state); |
2047 | printk(KERN_INFO " gh_flags ="); | |
b3b94faa DT |
2048 | for (x = 0; x < 32; x++) |
2049 | if (gh->gh_flags & (1 << x)) | |
2050 | printk(" %u", x); | |
2051 | printk(" \n"); | |
d92a8d48 SW |
2052 | printk(KERN_INFO " error = %d\n", gh->gh_error); |
2053 | printk(KERN_INFO " gh_iflags ="); | |
b3b94faa DT |
2054 | for (x = 0; x < 32; x++) |
2055 | if (test_bit(x, &gh->gh_iflags)) | |
2056 | printk(" %u", x); | |
2057 | printk(" \n"); | |
d0dc80db | 2058 | print_symbol(KERN_INFO " initialized at: %s\n", gh->gh_ip); |
b3b94faa DT |
2059 | |
2060 | error = 0; | |
2061 | ||
2062 | return error; | |
2063 | } | |
2064 | ||
2065 | /** | |
2066 | * dump_inode - print information about an inode | |
2067 | * @ip: the inode | |
2068 | * | |
2069 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
2070 | */ | |
2071 | ||
2072 | static int dump_inode(struct gfs2_inode *ip) | |
2073 | { | |
2074 | unsigned int x; | |
2075 | int error = -ENOBUFS; | |
2076 | ||
d92a8d48 SW |
2077 | printk(KERN_INFO " Inode:\n"); |
2078 | printk(KERN_INFO " num = %llu %llu\n", | |
382066da SW |
2079 | (unsigned long long)ip->i_num.no_formal_ino, |
2080 | (unsigned long long)ip->i_num.no_addr); | |
d92a8d48 | 2081 | printk(KERN_INFO " type = %u\n", IF2DT(ip->i_di.di_mode)); |
d92a8d48 | 2082 | printk(KERN_INFO " i_flags ="); |
b3b94faa DT |
2083 | for (x = 0; x < 32; x++) |
2084 | if (test_bit(x, &ip->i_flags)) | |
2085 | printk(" %u", x); | |
2086 | printk(" \n"); | |
b3b94faa DT |
2087 | |
2088 | error = 0; | |
2089 | ||
2090 | return error; | |
2091 | } | |
2092 | ||
2093 | /** | |
2094 | * dump_glock - print information about a glock | |
2095 | * @gl: the glock | |
2096 | * @count: where we are in the buffer | |
2097 | * | |
2098 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
2099 | */ | |
2100 | ||
2101 | static int dump_glock(struct gfs2_glock *gl) | |
2102 | { | |
2103 | struct gfs2_holder *gh; | |
2104 | unsigned int x; | |
2105 | int error = -ENOBUFS; | |
2106 | ||
2107 | spin_lock(&gl->gl_spin); | |
2108 | ||
85d1da67 | 2109 | printk(KERN_INFO "Glock 0x%p (%u, %llu)\n", gl, gl->gl_name.ln_type, |
382066da | 2110 | (unsigned long long)gl->gl_name.ln_number); |
d92a8d48 | 2111 | printk(KERN_INFO " gl_flags ="); |
85d1da67 | 2112 | for (x = 0; x < 32; x++) { |
b3b94faa DT |
2113 | if (test_bit(x, &gl->gl_flags)) |
2114 | printk(" %u", x); | |
85d1da67 | 2115 | } |
b3b94faa | 2116 | printk(" \n"); |
16feb9fe | 2117 | printk(KERN_INFO " gl_ref = %d\n", atomic_read(&gl->gl_ref)); |
d92a8d48 | 2118 | printk(KERN_INFO " gl_state = %u\n", gl->gl_state); |
320dd101 SW |
2119 | printk(KERN_INFO " gl_owner = %s\n", gl->gl_owner->comm); |
2120 | print_symbol(KERN_INFO " gl_ip = %s\n", gl->gl_ip); | |
d92a8d48 SW |
2121 | printk(KERN_INFO " req_gh = %s\n", (gl->gl_req_gh) ? "yes" : "no"); |
2122 | printk(KERN_INFO " req_bh = %s\n", (gl->gl_req_bh) ? "yes" : "no"); | |
2123 | printk(KERN_INFO " lvb_count = %d\n", atomic_read(&gl->gl_lvb_count)); | |
2124 | printk(KERN_INFO " object = %s\n", (gl->gl_object) ? "yes" : "no"); | |
2125 | printk(KERN_INFO " le = %s\n", | |
b3b94faa | 2126 | (list_empty(&gl->gl_le.le_list)) ? "no" : "yes"); |
d92a8d48 | 2127 | printk(KERN_INFO " reclaim = %s\n", |
b3b94faa DT |
2128 | (list_empty(&gl->gl_reclaim)) ? "no" : "yes"); |
2129 | if (gl->gl_aspace) | |
85d1da67 | 2130 | printk(KERN_INFO " aspace = 0x%p nrpages = %lu\n", gl->gl_aspace, |
88721877 | 2131 | gl->gl_aspace->i_mapping->nrpages); |
b3b94faa | 2132 | else |
d92a8d48 SW |
2133 | printk(KERN_INFO " aspace = no\n"); |
2134 | printk(KERN_INFO " ail = %d\n", atomic_read(&gl->gl_ail_count)); | |
b3b94faa DT |
2135 | if (gl->gl_req_gh) { |
2136 | error = dump_holder("Request", gl->gl_req_gh); | |
2137 | if (error) | |
2138 | goto out; | |
2139 | } | |
2140 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
2141 | error = dump_holder("Holder", gh); | |
2142 | if (error) | |
2143 | goto out; | |
2144 | } | |
2145 | list_for_each_entry(gh, &gl->gl_waiters1, gh_list) { | |
2146 | error = dump_holder("Waiter1", gh); | |
2147 | if (error) | |
2148 | goto out; | |
2149 | } | |
2150 | list_for_each_entry(gh, &gl->gl_waiters2, gh_list) { | |
2151 | error = dump_holder("Waiter2", gh); | |
2152 | if (error) | |
2153 | goto out; | |
2154 | } | |
2155 | list_for_each_entry(gh, &gl->gl_waiters3, gh_list) { | |
2156 | error = dump_holder("Waiter3", gh); | |
2157 | if (error) | |
2158 | goto out; | |
2159 | } | |
5c676f6d | 2160 | if (gl->gl_ops == &gfs2_inode_glops && gl->gl_object) { |
b3b94faa DT |
2161 | if (!test_bit(GLF_LOCK, &gl->gl_flags) && |
2162 | list_empty(&gl->gl_holders)) { | |
5c676f6d | 2163 | error = dump_inode(gl->gl_object); |
b3b94faa DT |
2164 | if (error) |
2165 | goto out; | |
2166 | } else { | |
2167 | error = -ENOBUFS; | |
d92a8d48 | 2168 | printk(KERN_INFO " Inode: busy\n"); |
b3b94faa DT |
2169 | } |
2170 | } | |
2171 | ||
2172 | error = 0; | |
2173 | ||
a91ea69f | 2174 | out: |
b3b94faa | 2175 | spin_unlock(&gl->gl_spin); |
b3b94faa DT |
2176 | return error; |
2177 | } | |
2178 | ||
2179 | /** | |
2180 | * gfs2_dump_lockstate - print out the current lockstate | |
2181 | * @sdp: the filesystem | |
2182 | * @ub: the buffer to copy the information into | |
2183 | * | |
2184 | * If @ub is NULL, dump the lockstate to the console. | |
2185 | * | |
2186 | */ | |
2187 | ||
08bc2dbc | 2188 | static int gfs2_dump_lockstate(struct gfs2_sbd *sdp) |
b3b94faa | 2189 | { |
b3b94faa | 2190 | struct gfs2_glock *gl; |
b6397893 | 2191 | struct hlist_node *h; |
b3b94faa DT |
2192 | unsigned int x; |
2193 | int error = 0; | |
2194 | ||
2195 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) { | |
b3b94faa | 2196 | |
087efdd3 | 2197 | read_lock(gl_lock_addr(x)); |
b3b94faa | 2198 | |
b6397893 | 2199 | hlist_for_each_entry(gl, h, &gl_hash_table[x].hb_list, gl_list) { |
85d1da67 SW |
2200 | if (gl->gl_sbd != sdp) |
2201 | continue; | |
b3b94faa DT |
2202 | |
2203 | error = dump_glock(gl); | |
2204 | if (error) | |
2205 | break; | |
2206 | } | |
2207 | ||
087efdd3 | 2208 | read_unlock(gl_lock_addr(x)); |
b3b94faa DT |
2209 | |
2210 | if (error) | |
2211 | break; | |
2212 | } | |
2213 | ||
2214 | ||
2215 | return error; | |
2216 | } | |
2217 | ||
85d1da67 SW |
2218 | int __init gfs2_glock_init(void) |
2219 | { | |
2220 | unsigned i; | |
2221 | for(i = 0; i < GFS2_GL_HASH_SIZE; i++) { | |
b6397893 | 2222 | INIT_HLIST_HEAD(&gl_hash_table[i].hb_list); |
85d1da67 | 2223 | } |
087efdd3 SW |
2224 | #ifdef GL_HASH_LOCK_SZ |
2225 | for(i = 0; i < GL_HASH_LOCK_SZ; i++) { | |
2226 | rwlock_init(&gl_hash_locks[i]); | |
2227 | } | |
2228 | #endif | |
85d1da67 SW |
2229 | return 0; |
2230 | } | |
2231 |