Commit | Line | Data |
---|---|---|
7336d0e6 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
b3b94faa DT |
2 | /* |
3 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
cf45b752 | 4 | * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. |
b3b94faa DT |
5 | */ |
6 | ||
d77d1b58 JP |
7 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
8 | ||
b3b94faa DT |
9 | #include <linux/sched.h> |
10 | #include <linux/slab.h> | |
11 | #include <linux/spinlock.h> | |
b3b94faa DT |
12 | #include <linux/buffer_head.h> |
13 | #include <linux/delay.h> | |
14 | #include <linux/sort.h> | |
0515480a | 15 | #include <linux/hash.h> |
b3b94faa | 16 | #include <linux/jhash.h> |
d0dc80db | 17 | #include <linux/kallsyms.h> |
5c676f6d | 18 | #include <linux/gfs2_ondisk.h> |
24264434 | 19 | #include <linux/list.h> |
fee852e3 | 20 | #include <linux/wait.h> |
95d97b7d | 21 | #include <linux/module.h> |
7c0f6ba6 | 22 | #include <linux/uaccess.h> |
7c52b166 RP |
23 | #include <linux/seq_file.h> |
24 | #include <linux/debugfs.h> | |
8fbbfd21 SW |
25 | #include <linux/kthread.h> |
26 | #include <linux/freezer.h> | |
c4f68a13 BM |
27 | #include <linux/workqueue.h> |
28 | #include <linux/jiffies.h> | |
bc015cb8 SW |
29 | #include <linux/rcupdate.h> |
30 | #include <linux/rculist_bl.h> | |
31 | #include <linux/bit_spinlock.h> | |
a245769f | 32 | #include <linux/percpu.h> |
4506a519 | 33 | #include <linux/list_sort.h> |
e66cf161 | 34 | #include <linux/lockref.h> |
88ffbf3e | 35 | #include <linux/rhashtable.h> |
b3b94faa DT |
36 | |
37 | #include "gfs2.h" | |
5c676f6d | 38 | #include "incore.h" |
b3b94faa DT |
39 | #include "glock.h" |
40 | #include "glops.h" | |
41 | #include "inode.h" | |
b3b94faa DT |
42 | #include "lops.h" |
43 | #include "meta_io.h" | |
44 | #include "quota.h" | |
45 | #include "super.h" | |
5c676f6d | 46 | #include "util.h" |
813e0c46 | 47 | #include "bmap.h" |
63997775 SW |
48 | #define CREATE_TRACE_POINTS |
49 | #include "trace_gfs2.h" | |
b3b94faa | 50 | |
6802e340 | 51 | struct gfs2_glock_iter { |
ba1ddcb6 | 52 | struct gfs2_sbd *sdp; /* incore superblock */ |
88ffbf3e | 53 | struct rhashtable_iter hti; /* rhashtable iterator */ |
ba1ddcb6 SW |
54 | struct gfs2_glock *gl; /* current glock struct */ |
55 | loff_t last_pos; /* last position */ | |
7c52b166 RP |
56 | }; |
57 | ||
b3b94faa DT |
58 | typedef void (*glock_examiner) (struct gfs2_glock * gl); |
59 | ||
6802e340 | 60 | static void do_xmote(struct gfs2_glock *gl, struct gfs2_holder *gh, unsigned int target); |
c4f68a13 | 61 | |
7c52b166 | 62 | static struct dentry *gfs2_root; |
c4f68a13 | 63 | static struct workqueue_struct *glock_workqueue; |
b94a170e | 64 | struct workqueue_struct *gfs2_delete_workqueue; |
97cc1025 SW |
65 | static LIST_HEAD(lru_list); |
66 | static atomic_t lru_count = ATOMIC_INIT(0); | |
eb8374e7 | 67 | static DEFINE_SPINLOCK(lru_lock); |
08bc2dbc | 68 | |
b6397893 | 69 | #define GFS2_GL_HASH_SHIFT 15 |
47a9a527 | 70 | #define GFS2_GL_HASH_SIZE BIT(GFS2_GL_HASH_SHIFT) |
087efdd3 | 71 | |
d296b15e | 72 | static const struct rhashtable_params ht_parms = { |
88ffbf3e | 73 | .nelem_hint = GFS2_GL_HASH_SIZE * 3 / 4, |
972b044e | 74 | .key_len = offsetofend(struct lm_lockname, ln_type), |
88ffbf3e BP |
75 | .key_offset = offsetof(struct gfs2_glock, gl_name), |
76 | .head_offset = offsetof(struct gfs2_glock, gl_node), | |
77 | }; | |
b3b94faa | 78 | |
88ffbf3e | 79 | static struct rhashtable gl_hash_table; |
b3b94faa | 80 | |
0515480a AG |
81 | #define GLOCK_WAIT_TABLE_BITS 12 |
82 | #define GLOCK_WAIT_TABLE_SIZE (1 << GLOCK_WAIT_TABLE_BITS) | |
83 | static wait_queue_head_t glock_wait_table[GLOCK_WAIT_TABLE_SIZE] __cacheline_aligned; | |
84 | ||
85 | struct wait_glock_queue { | |
86 | struct lm_lockname *name; | |
87 | wait_queue_entry_t wait; | |
88 | }; | |
89 | ||
90 | static int glock_wake_function(wait_queue_entry_t *wait, unsigned int mode, | |
91 | int sync, void *key) | |
92 | { | |
93 | struct wait_glock_queue *wait_glock = | |
94 | container_of(wait, struct wait_glock_queue, wait); | |
95 | struct lm_lockname *wait_name = wait_glock->name; | |
96 | struct lm_lockname *wake_name = key; | |
97 | ||
98 | if (wake_name->ln_sbd != wait_name->ln_sbd || | |
99 | wake_name->ln_number != wait_name->ln_number || | |
100 | wake_name->ln_type != wait_name->ln_type) | |
101 | return 0; | |
102 | return autoremove_wake_function(wait, mode, sync, key); | |
103 | } | |
104 | ||
105 | static wait_queue_head_t *glock_waitqueue(struct lm_lockname *name) | |
106 | { | |
605b0487 | 107 | u32 hash = jhash2((u32 *)name, ht_parms.key_len / 4, 0); |
0515480a AG |
108 | |
109 | return glock_wait_table + hash_32(hash, GLOCK_WAIT_TABLE_BITS); | |
110 | } | |
111 | ||
0515480a AG |
112 | /** |
113 | * wake_up_glock - Wake up waiters on a glock | |
114 | * @gl: the glock | |
115 | */ | |
116 | static void wake_up_glock(struct gfs2_glock *gl) | |
117 | { | |
118 | wait_queue_head_t *wq = glock_waitqueue(&gl->gl_name); | |
119 | ||
120 | if (waitqueue_active(wq)) | |
121 | __wake_up(wq, TASK_NORMAL, 1, &gl->gl_name); | |
122 | } | |
123 | ||
961ae1d8 | 124 | static void gfs2_glock_dealloc(struct rcu_head *rcu) |
b3b94faa | 125 | { |
961ae1d8 | 126 | struct gfs2_glock *gl = container_of(rcu, struct gfs2_glock, gl_rcu); |
b3b94faa | 127 | |
dba2d70c | 128 | if (gl->gl_ops->go_flags & GLOF_ASPACE) { |
bc015cb8 | 129 | kmem_cache_free(gfs2_glock_aspace_cachep, gl); |
dba2d70c | 130 | } else { |
4e2f8849 | 131 | kfree(gl->gl_lksb.sb_lvbptr); |
bc015cb8 | 132 | kmem_cache_free(gfs2_glock_cachep, gl); |
dba2d70c | 133 | } |
961ae1d8 AG |
134 | } |
135 | ||
136 | void gfs2_glock_free(struct gfs2_glock *gl) | |
137 | { | |
138 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; | |
139 | ||
638803d4 | 140 | BUG_ON(atomic_read(&gl->gl_revokes)); |
0515480a AG |
141 | rhashtable_remove_fast(&gl_hash_table, &gl->gl_node, ht_parms); |
142 | smp_mb(); | |
143 | wake_up_glock(gl); | |
961ae1d8 | 144 | call_rcu(&gl->gl_rcu, gfs2_glock_dealloc); |
bc015cb8 SW |
145 | if (atomic_dec_and_test(&sdp->sd_glock_disposal)) |
146 | wake_up(&sdp->sd_glock_wait); | |
b3b94faa DT |
147 | } |
148 | ||
149 | /** | |
150 | * gfs2_glock_hold() - increment reference count on glock | |
151 | * @gl: The glock to hold | |
152 | * | |
153 | */ | |
154 | ||
71c1b213 | 155 | void gfs2_glock_hold(struct gfs2_glock *gl) |
b3b94faa | 156 | { |
e66cf161 SW |
157 | GLOCK_BUG_ON(gl, __lockref_is_dead(&gl->gl_lockref)); |
158 | lockref_get(&gl->gl_lockref); | |
b3b94faa DT |
159 | } |
160 | ||
8ff22a6f BM |
161 | /** |
162 | * demote_ok - Check to see if it's ok to unlock a glock | |
163 | * @gl: the glock | |
164 | * | |
165 | * Returns: 1 if it's ok | |
166 | */ | |
167 | ||
168 | static int demote_ok(const struct gfs2_glock *gl) | |
169 | { | |
170 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
171 | ||
172 | if (gl->gl_state == LM_ST_UNLOCKED) | |
173 | return 0; | |
f42ab085 | 174 | if (!list_empty(&gl->gl_holders)) |
8ff22a6f BM |
175 | return 0; |
176 | if (glops->go_demote_ok) | |
177 | return glops->go_demote_ok(gl); | |
178 | return 1; | |
179 | } | |
180 | ||
bc015cb8 | 181 | |
29687a2a SW |
182 | void gfs2_glock_add_to_lru(struct gfs2_glock *gl) |
183 | { | |
7881ef3f RL |
184 | if (!(gl->gl_ops->go_flags & GLOF_LRU)) |
185 | return; | |
186 | ||
29687a2a SW |
187 | spin_lock(&lru_lock); |
188 | ||
7881ef3f RL |
189 | list_del(&gl->gl_lru); |
190 | list_add_tail(&gl->gl_lru, &lru_list); | |
191 | ||
192 | if (!test_bit(GLF_LRU, &gl->gl_flags)) { | |
193 | set_bit(GLF_LRU, &gl->gl_flags); | |
29687a2a | 194 | atomic_inc(&lru_count); |
7881ef3f | 195 | } |
29687a2a | 196 | |
29687a2a SW |
197 | spin_unlock(&lru_lock); |
198 | } | |
199 | ||
8f6cb409 | 200 | static void gfs2_glock_remove_from_lru(struct gfs2_glock *gl) |
f42ab085 | 201 | { |
645ebd49 BP |
202 | if (!(gl->gl_ops->go_flags & GLOF_LRU)) |
203 | return; | |
204 | ||
8f6cb409 | 205 | spin_lock(&lru_lock); |
7881ef3f | 206 | if (test_bit(GLF_LRU, &gl->gl_flags)) { |
f42ab085 SW |
207 | list_del_init(&gl->gl_lru); |
208 | atomic_dec(&lru_count); | |
209 | clear_bit(GLF_LRU, &gl->gl_flags); | |
210 | } | |
211 | spin_unlock(&lru_lock); | |
212 | } | |
213 | ||
6b0c7440 AG |
214 | /* |
215 | * Enqueue the glock on the work queue. Passes one glock reference on to the | |
216 | * work queue. | |
b3b94faa | 217 | */ |
6b0c7440 AG |
218 | static void __gfs2_glock_queue_work(struct gfs2_glock *gl, unsigned long delay) { |
219 | if (!queue_delayed_work(glock_workqueue, &gl->gl_work, delay)) { | |
220 | /* | |
221 | * We are holding the lockref spinlock, and the work was still | |
222 | * queued above. The queued work (glock_work_func) takes that | |
223 | * spinlock before dropping its glock reference(s), so it | |
224 | * cannot have dropped them in the meantime. | |
225 | */ | |
226 | GLOCK_BUG_ON(gl, gl->gl_lockref.count < 2); | |
227 | gl->gl_lockref.count--; | |
228 | } | |
229 | } | |
b3b94faa | 230 | |
6b0c7440 AG |
231 | static void gfs2_glock_queue_work(struct gfs2_glock *gl, unsigned long delay) { |
232 | spin_lock(&gl->gl_lockref.lock); | |
233 | __gfs2_glock_queue_work(gl, delay); | |
234 | spin_unlock(&gl->gl_lockref.lock); | |
235 | } | |
236 | ||
237 | static void __gfs2_glock_put(struct gfs2_glock *gl) | |
b3b94faa | 238 | { |
15562c43 | 239 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
bc015cb8 | 240 | struct address_space *mapping = gfs2_glock2aspace(gl); |
b3b94faa | 241 | |
e66cf161 SW |
242 | lockref_mark_dead(&gl->gl_lockref); |
243 | ||
8f6cb409 | 244 | gfs2_glock_remove_from_lru(gl); |
e66cf161 | 245 | spin_unlock(&gl->gl_lockref.lock); |
e66cf161 SW |
246 | GLOCK_BUG_ON(gl, !list_empty(&gl->gl_holders)); |
247 | GLOCK_BUG_ON(gl, mapping && mapping->nrpages); | |
248 | trace_gfs2_glock_put(gl); | |
249 | sdp->sd_lockstruct.ls_ops->lm_put_lock(gl); | |
b3b94faa DT |
250 | } |
251 | ||
71c1b213 AG |
252 | /* |
253 | * Cause the glock to be put in work queue context. | |
254 | */ | |
255 | void gfs2_glock_queue_put(struct gfs2_glock *gl) | |
256 | { | |
257 | gfs2_glock_queue_work(gl, 0); | |
258 | } | |
259 | ||
6b0c7440 AG |
260 | /** |
261 | * gfs2_glock_put() - Decrement reference count on glock | |
262 | * @gl: The glock to put | |
263 | * | |
264 | */ | |
265 | ||
266 | void gfs2_glock_put(struct gfs2_glock *gl) | |
267 | { | |
268 | if (lockref_put_or_lock(&gl->gl_lockref)) | |
269 | return; | |
270 | ||
271 | __gfs2_glock_put(gl); | |
272 | } | |
273 | ||
6802e340 SW |
274 | /** |
275 | * may_grant - check if its ok to grant a new lock | |
276 | * @gl: The glock | |
277 | * @gh: The lock request which we wish to grant | |
278 | * | |
279 | * Returns: true if its ok to grant the lock | |
280 | */ | |
281 | ||
282 | static inline int may_grant(const struct gfs2_glock *gl, const struct gfs2_holder *gh) | |
283 | { | |
284 | const struct gfs2_holder *gh_head = list_entry(gl->gl_holders.next, const struct gfs2_holder, gh_list); | |
285 | if ((gh->gh_state == LM_ST_EXCLUSIVE || | |
286 | gh_head->gh_state == LM_ST_EXCLUSIVE) && gh != gh_head) | |
287 | return 0; | |
288 | if (gl->gl_state == gh->gh_state) | |
289 | return 1; | |
290 | if (gh->gh_flags & GL_EXACT) | |
291 | return 0; | |
209806ab SW |
292 | if (gl->gl_state == LM_ST_EXCLUSIVE) { |
293 | if (gh->gh_state == LM_ST_SHARED && gh_head->gh_state == LM_ST_SHARED) | |
294 | return 1; | |
295 | if (gh->gh_state == LM_ST_DEFERRED && gh_head->gh_state == LM_ST_DEFERRED) | |
296 | return 1; | |
297 | } | |
6802e340 SW |
298 | if (gl->gl_state != LM_ST_UNLOCKED && (gh->gh_flags & LM_FLAG_ANY)) |
299 | return 1; | |
300 | return 0; | |
301 | } | |
302 | ||
303 | static void gfs2_holder_wake(struct gfs2_holder *gh) | |
304 | { | |
305 | clear_bit(HIF_WAIT, &gh->gh_iflags); | |
4e857c58 | 306 | smp_mb__after_atomic(); |
6802e340 | 307 | wake_up_bit(&gh->gh_iflags, HIF_WAIT); |
ad26967b BP |
308 | if (gh->gh_flags & GL_ASYNC) { |
309 | struct gfs2_sbd *sdp = gh->gh_gl->gl_name.ln_sbd; | |
310 | ||
311 | wake_up(&sdp->sd_async_glock_wait); | |
312 | } | |
6802e340 SW |
313 | } |
314 | ||
d5341a92 SW |
315 | /** |
316 | * do_error - Something unexpected has happened during a lock request | |
317 | * | |
318 | */ | |
319 | ||
a527b38e | 320 | static void do_error(struct gfs2_glock *gl, const int ret) |
d5341a92 SW |
321 | { |
322 | struct gfs2_holder *gh, *tmp; | |
323 | ||
324 | list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) { | |
325 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
326 | continue; | |
327 | if (ret & LM_OUT_ERROR) | |
328 | gh->gh_error = -EIO; | |
329 | else if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) | |
330 | gh->gh_error = GLR_TRYFAILED; | |
331 | else | |
332 | continue; | |
333 | list_del_init(&gh->gh_list); | |
334 | trace_gfs2_glock_queue(gh, 0); | |
335 | gfs2_holder_wake(gh); | |
336 | } | |
337 | } | |
338 | ||
6802e340 SW |
339 | /** |
340 | * do_promote - promote as many requests as possible on the current queue | |
341 | * @gl: The glock | |
342 | * | |
813e0c46 SW |
343 | * Returns: 1 if there is a blocked holder at the head of the list, or 2 |
344 | * if a type specific operation is underway. | |
6802e340 SW |
345 | */ |
346 | ||
347 | static int do_promote(struct gfs2_glock *gl) | |
f3dd1649 AG |
348 | __releases(&gl->gl_lockref.lock) |
349 | __acquires(&gl->gl_lockref.lock) | |
6802e340 SW |
350 | { |
351 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
352 | struct gfs2_holder *gh, *tmp; | |
353 | int ret; | |
354 | ||
355 | restart: | |
356 | list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) { | |
357 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
358 | continue; | |
359 | if (may_grant(gl, gh)) { | |
360 | if (gh->gh_list.prev == &gl->gl_holders && | |
361 | glops->go_lock) { | |
f3dd1649 | 362 | spin_unlock(&gl->gl_lockref.lock); |
6802e340 SW |
363 | /* FIXME: eliminate this eventually */ |
364 | ret = glops->go_lock(gh); | |
f3dd1649 | 365 | spin_lock(&gl->gl_lockref.lock); |
6802e340 | 366 | if (ret) { |
813e0c46 SW |
367 | if (ret == 1) |
368 | return 2; | |
6802e340 SW |
369 | gh->gh_error = ret; |
370 | list_del_init(&gh->gh_list); | |
63997775 | 371 | trace_gfs2_glock_queue(gh, 0); |
6802e340 SW |
372 | gfs2_holder_wake(gh); |
373 | goto restart; | |
374 | } | |
375 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
63997775 | 376 | trace_gfs2_promote(gh, 1); |
6802e340 SW |
377 | gfs2_holder_wake(gh); |
378 | goto restart; | |
379 | } | |
380 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
63997775 | 381 | trace_gfs2_promote(gh, 0); |
6802e340 SW |
382 | gfs2_holder_wake(gh); |
383 | continue; | |
384 | } | |
385 | if (gh->gh_list.prev == &gl->gl_holders) | |
386 | return 1; | |
d5341a92 | 387 | do_error(gl, 0); |
6802e340 SW |
388 | break; |
389 | } | |
390 | return 0; | |
391 | } | |
392 | ||
6802e340 SW |
393 | /** |
394 | * find_first_waiter - find the first gh that's waiting for the glock | |
395 | * @gl: the glock | |
396 | */ | |
397 | ||
398 | static inline struct gfs2_holder *find_first_waiter(const struct gfs2_glock *gl) | |
399 | { | |
400 | struct gfs2_holder *gh; | |
401 | ||
402 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
403 | if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
404 | return gh; | |
405 | } | |
406 | return NULL; | |
407 | } | |
408 | ||
409 | /** | |
410 | * state_change - record that the glock is now in a different state | |
411 | * @gl: the glock | |
412 | * @new_state the new state | |
413 | * | |
414 | */ | |
415 | ||
416 | static void state_change(struct gfs2_glock *gl, unsigned int new_state) | |
417 | { | |
418 | int held1, held2; | |
419 | ||
420 | held1 = (gl->gl_state != LM_ST_UNLOCKED); | |
421 | held2 = (new_state != LM_ST_UNLOCKED); | |
422 | ||
423 | if (held1 != held2) { | |
e66cf161 | 424 | GLOCK_BUG_ON(gl, __lockref_is_dead(&gl->gl_lockref)); |
6802e340 | 425 | if (held2) |
e66cf161 | 426 | gl->gl_lockref.count++; |
6802e340 | 427 | else |
e66cf161 | 428 | gl->gl_lockref.count--; |
6802e340 | 429 | } |
7b5e3d5f SW |
430 | if (held1 && held2 && list_empty(&gl->gl_holders)) |
431 | clear_bit(GLF_QUEUED, &gl->gl_flags); | |
6802e340 | 432 | |
7cf8dcd3 BP |
433 | if (new_state != gl->gl_target) |
434 | /* shorten our minimum hold time */ | |
435 | gl->gl_hold_time = max(gl->gl_hold_time - GL_GLOCK_HOLD_DECR, | |
436 | GL_GLOCK_MIN_HOLD); | |
6802e340 SW |
437 | gl->gl_state = new_state; |
438 | gl->gl_tchange = jiffies; | |
439 | } | |
440 | ||
441 | static void gfs2_demote_wake(struct gfs2_glock *gl) | |
442 | { | |
443 | gl->gl_demote_state = LM_ST_EXCLUSIVE; | |
444 | clear_bit(GLF_DEMOTE, &gl->gl_flags); | |
4e857c58 | 445 | smp_mb__after_atomic(); |
6802e340 SW |
446 | wake_up_bit(&gl->gl_flags, GLF_DEMOTE); |
447 | } | |
448 | ||
449 | /** | |
450 | * finish_xmote - The DLM has replied to one of our lock requests | |
451 | * @gl: The glock | |
452 | * @ret: The status from the DLM | |
453 | * | |
454 | */ | |
455 | ||
456 | static void finish_xmote(struct gfs2_glock *gl, unsigned int ret) | |
457 | { | |
458 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
459 | struct gfs2_holder *gh; | |
460 | unsigned state = ret & LM_OUT_ST_MASK; | |
813e0c46 | 461 | int rv; |
6802e340 | 462 | |
f3dd1649 | 463 | spin_lock(&gl->gl_lockref.lock); |
63997775 | 464 | trace_gfs2_glock_state_change(gl, state); |
6802e340 SW |
465 | state_change(gl, state); |
466 | gh = find_first_waiter(gl); | |
467 | ||
468 | /* Demote to UN request arrived during demote to SH or DF */ | |
469 | if (test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags) && | |
470 | state != LM_ST_UNLOCKED && gl->gl_demote_state == LM_ST_UNLOCKED) | |
471 | gl->gl_target = LM_ST_UNLOCKED; | |
472 | ||
473 | /* Check for state != intended state */ | |
474 | if (unlikely(state != gl->gl_target)) { | |
475 | if (gh && !test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)) { | |
476 | /* move to back of queue and try next entry */ | |
477 | if (ret & LM_OUT_CANCELED) { | |
478 | if ((gh->gh_flags & LM_FLAG_PRIORITY) == 0) | |
479 | list_move_tail(&gh->gh_list, &gl->gl_holders); | |
480 | gh = find_first_waiter(gl); | |
481 | gl->gl_target = gh->gh_state; | |
482 | goto retry; | |
483 | } | |
484 | /* Some error or failed "try lock" - report it */ | |
485 | if ((ret & LM_OUT_ERROR) || | |
486 | (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) { | |
487 | gl->gl_target = gl->gl_state; | |
488 | do_error(gl, ret); | |
489 | goto out; | |
490 | } | |
491 | } | |
492 | switch(state) { | |
493 | /* Unlocked due to conversion deadlock, try again */ | |
494 | case LM_ST_UNLOCKED: | |
495 | retry: | |
496 | do_xmote(gl, gh, gl->gl_target); | |
497 | break; | |
498 | /* Conversion fails, unlock and try again */ | |
499 | case LM_ST_SHARED: | |
500 | case LM_ST_DEFERRED: | |
501 | do_xmote(gl, gh, LM_ST_UNLOCKED); | |
502 | break; | |
503 | default: /* Everything else */ | |
e54c78a2 BP |
504 | fs_err(gl->gl_name.ln_sbd, "wanted %u got %u\n", |
505 | gl->gl_target, state); | |
6802e340 SW |
506 | GLOCK_BUG_ON(gl, 1); |
507 | } | |
f3dd1649 | 508 | spin_unlock(&gl->gl_lockref.lock); |
6802e340 SW |
509 | return; |
510 | } | |
511 | ||
512 | /* Fast path - we got what we asked for */ | |
513 | if (test_and_clear_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)) | |
514 | gfs2_demote_wake(gl); | |
515 | if (state != LM_ST_UNLOCKED) { | |
516 | if (glops->go_xmote_bh) { | |
f3dd1649 | 517 | spin_unlock(&gl->gl_lockref.lock); |
6802e340 | 518 | rv = glops->go_xmote_bh(gl, gh); |
f3dd1649 | 519 | spin_lock(&gl->gl_lockref.lock); |
6802e340 SW |
520 | if (rv) { |
521 | do_error(gl, rv); | |
522 | goto out; | |
523 | } | |
524 | } | |
813e0c46 SW |
525 | rv = do_promote(gl); |
526 | if (rv == 2) | |
527 | goto out_locked; | |
6802e340 SW |
528 | } |
529 | out: | |
530 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
813e0c46 | 531 | out_locked: |
f3dd1649 | 532 | spin_unlock(&gl->gl_lockref.lock); |
6802e340 SW |
533 | } |
534 | ||
6802e340 SW |
535 | /** |
536 | * do_xmote - Calls the DLM to change the state of a lock | |
537 | * @gl: The lock state | |
538 | * @gh: The holder (only for promotes) | |
539 | * @target: The target lock state | |
540 | * | |
541 | */ | |
542 | ||
543 | static void do_xmote(struct gfs2_glock *gl, struct gfs2_holder *gh, unsigned int target) | |
f3dd1649 AG |
544 | __releases(&gl->gl_lockref.lock) |
545 | __acquires(&gl->gl_lockref.lock) | |
6802e340 SW |
546 | { |
547 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
15562c43 | 548 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
b58bf407 | 549 | unsigned int lck_flags = (unsigned int)(gh ? gh->gh_flags : 0); |
6802e340 SW |
550 | int ret; |
551 | ||
eb43e660 | 552 | if (unlikely(gfs2_withdrawn(sdp)) && |
ed17545d | 553 | target != LM_ST_UNLOCKED) |
0d1c7ae9 | 554 | return; |
6802e340 SW |
555 | lck_flags &= (LM_FLAG_TRY | LM_FLAG_TRY_1CB | LM_FLAG_NOEXP | |
556 | LM_FLAG_PRIORITY); | |
921169ca SW |
557 | GLOCK_BUG_ON(gl, gl->gl_state == target); |
558 | GLOCK_BUG_ON(gl, gl->gl_state == gl->gl_target); | |
6802e340 SW |
559 | if ((target == LM_ST_UNLOCKED || target == LM_ST_DEFERRED) && |
560 | glops->go_inval) { | |
d99724c3 BP |
561 | /* |
562 | * If another process is already doing the invalidate, let that | |
563 | * finish first. The glock state machine will get back to this | |
564 | * holder again later. | |
565 | */ | |
566 | if (test_and_set_bit(GLF_INVALIDATE_IN_PROGRESS, | |
567 | &gl->gl_flags)) | |
568 | return; | |
6802e340 SW |
569 | do_error(gl, 0); /* Fail queued try locks */ |
570 | } | |
47a25380 | 571 | gl->gl_req = target; |
a245769f SW |
572 | set_bit(GLF_BLOCKING, &gl->gl_flags); |
573 | if ((gl->gl_req == LM_ST_UNLOCKED) || | |
574 | (gl->gl_state == LM_ST_EXCLUSIVE) || | |
575 | (lck_flags & (LM_FLAG_TRY|LM_FLAG_TRY_1CB))) | |
576 | clear_bit(GLF_BLOCKING, &gl->gl_flags); | |
f3dd1649 | 577 | spin_unlock(&gl->gl_lockref.lock); |
06dfc306 BP |
578 | if (glops->go_sync) |
579 | glops->go_sync(gl); | |
6802e340 SW |
580 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags)) |
581 | glops->go_inval(gl, target == LM_ST_DEFERRED ? 0 : DIO_METADATA); | |
582 | clear_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags); | |
583 | ||
584 | gfs2_glock_hold(gl); | |
921169ca SW |
585 | if (sdp->sd_lockstruct.ls_ops->lm_lock) { |
586 | /* lock_dlm */ | |
587 | ret = sdp->sd_lockstruct.ls_ops->lm_lock(gl, target, lck_flags); | |
3e11e530 BM |
588 | if (ret == -EINVAL && gl->gl_target == LM_ST_UNLOCKED && |
589 | target == LM_ST_UNLOCKED && | |
590 | test_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags)) { | |
591 | finish_xmote(gl, target); | |
6b0c7440 | 592 | gfs2_glock_queue_work(gl, 0); |
3e11e530 BM |
593 | } |
594 | else if (ret) { | |
e54c78a2 | 595 | fs_err(sdp, "lm_lock ret %d\n", ret); |
eb43e660 | 596 | GLOCK_BUG_ON(gl, !gfs2_withdrawn(sdp)); |
dba2d70c | 597 | } |
921169ca SW |
598 | } else { /* lock_nolock */ |
599 | finish_xmote(gl, target); | |
6b0c7440 | 600 | gfs2_glock_queue_work(gl, 0); |
6802e340 | 601 | } |
921169ca | 602 | |
f3dd1649 | 603 | spin_lock(&gl->gl_lockref.lock); |
6802e340 SW |
604 | } |
605 | ||
606 | /** | |
607 | * find_first_holder - find the first "holder" gh | |
608 | * @gl: the glock | |
609 | */ | |
610 | ||
611 | static inline struct gfs2_holder *find_first_holder(const struct gfs2_glock *gl) | |
612 | { | |
613 | struct gfs2_holder *gh; | |
614 | ||
615 | if (!list_empty(&gl->gl_holders)) { | |
616 | gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list); | |
617 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
618 | return gh; | |
619 | } | |
620 | return NULL; | |
621 | } | |
622 | ||
623 | /** | |
624 | * run_queue - do all outstanding tasks related to a glock | |
625 | * @gl: The glock in question | |
626 | * @nonblock: True if we must not block in run_queue | |
627 | * | |
628 | */ | |
629 | ||
630 | static void run_queue(struct gfs2_glock *gl, const int nonblock) | |
f3dd1649 AG |
631 | __releases(&gl->gl_lockref.lock) |
632 | __acquires(&gl->gl_lockref.lock) | |
6802e340 SW |
633 | { |
634 | struct gfs2_holder *gh = NULL; | |
813e0c46 | 635 | int ret; |
6802e340 SW |
636 | |
637 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) | |
638 | return; | |
639 | ||
640 | GLOCK_BUG_ON(gl, test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)); | |
641 | ||
642 | if (test_bit(GLF_DEMOTE, &gl->gl_flags) && | |
643 | gl->gl_demote_state != gl->gl_state) { | |
644 | if (find_first_holder(gl)) | |
d8348de0 | 645 | goto out_unlock; |
6802e340 SW |
646 | if (nonblock) |
647 | goto out_sched; | |
648 | set_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags); | |
265d529c | 649 | GLOCK_BUG_ON(gl, gl->gl_demote_state == LM_ST_EXCLUSIVE); |
6802e340 SW |
650 | gl->gl_target = gl->gl_demote_state; |
651 | } else { | |
652 | if (test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
653 | gfs2_demote_wake(gl); | |
813e0c46 SW |
654 | ret = do_promote(gl); |
655 | if (ret == 0) | |
d8348de0 | 656 | goto out_unlock; |
813e0c46 | 657 | if (ret == 2) |
a228df63 | 658 | goto out; |
6802e340 SW |
659 | gh = find_first_waiter(gl); |
660 | gl->gl_target = gh->gh_state; | |
661 | if (!(gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) | |
662 | do_error(gl, 0); /* Fail queued try locks */ | |
663 | } | |
664 | do_xmote(gl, gh, gl->gl_target); | |
a228df63 | 665 | out: |
6802e340 SW |
666 | return; |
667 | ||
668 | out_sched: | |
7e71c55e | 669 | clear_bit(GLF_LOCK, &gl->gl_flags); |
4e857c58 | 670 | smp_mb__after_atomic(); |
e66cf161 | 671 | gl->gl_lockref.count++; |
6b0c7440 | 672 | __gfs2_glock_queue_work(gl, 0); |
7e71c55e SW |
673 | return; |
674 | ||
d8348de0 | 675 | out_unlock: |
6802e340 | 676 | clear_bit(GLF_LOCK, &gl->gl_flags); |
4e857c58 | 677 | smp_mb__after_atomic(); |
7e71c55e | 678 | return; |
6802e340 SW |
679 | } |
680 | ||
b94a170e BM |
681 | static void delete_work_func(struct work_struct *work) |
682 | { | |
683 | struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_delete); | |
15562c43 | 684 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
ec5ec66b | 685 | struct inode *inode; |
044b9414 SW |
686 | u64 no_addr = gl->gl_name.ln_number; |
687 | ||
a4923865 BP |
688 | /* If someone's using this glock to create a new dinode, the block must |
689 | have been freed by another node, then re-used, in which case our | |
690 | iopen callback is too late after the fact. Ignore it. */ | |
691 | if (test_bit(GLF_INODE_CREATING, &gl->gl_flags)) | |
692 | goto out; | |
693 | ||
ec5ec66b | 694 | inode = gfs2_lookup_by_inum(sdp, no_addr, NULL, GFS2_BLKST_UNLINKED); |
15a798f7 | 695 | if (!IS_ERR_OR_NULL(inode)) { |
044b9414 SW |
696 | d_prune_aliases(inode); |
697 | iput(inode); | |
b94a170e | 698 | } |
a4923865 | 699 | out: |
b94a170e BM |
700 | gfs2_glock_put(gl); |
701 | } | |
702 | ||
c4f68a13 BM |
703 | static void glock_work_func(struct work_struct *work) |
704 | { | |
6802e340 | 705 | unsigned long delay = 0; |
c4f68a13 | 706 | struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_work.work); |
6b0c7440 | 707 | unsigned int drop_refs = 1; |
c4f68a13 | 708 | |
26bb7505 | 709 | if (test_and_clear_bit(GLF_REPLY_PENDING, &gl->gl_flags)) { |
6802e340 | 710 | finish_xmote(gl, gl->gl_reply); |
6b0c7440 | 711 | drop_refs++; |
26bb7505 | 712 | } |
f3dd1649 | 713 | spin_lock(&gl->gl_lockref.lock); |
f90e5b5b | 714 | if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && |
265d529c SW |
715 | gl->gl_state != LM_ST_UNLOCKED && |
716 | gl->gl_demote_state != LM_ST_EXCLUSIVE) { | |
6802e340 | 717 | unsigned long holdtime, now = jiffies; |
f90e5b5b | 718 | |
7cf8dcd3 | 719 | holdtime = gl->gl_tchange + gl->gl_hold_time; |
6802e340 SW |
720 | if (time_before(now, holdtime)) |
721 | delay = holdtime - now; | |
f90e5b5b BP |
722 | |
723 | if (!delay) { | |
724 | clear_bit(GLF_PENDING_DEMOTE, &gl->gl_flags); | |
725 | set_bit(GLF_DEMOTE, &gl->gl_flags); | |
726 | } | |
6802e340 SW |
727 | } |
728 | run_queue(gl, 0); | |
6b0c7440 AG |
729 | if (delay) { |
730 | /* Keep one glock reference for the work we requeue. */ | |
731 | drop_refs--; | |
7cf8dcd3 BP |
732 | if (gl->gl_name.ln_type != LM_TYPE_INODE) |
733 | delay = 0; | |
6b0c7440 | 734 | __gfs2_glock_queue_work(gl, delay); |
7cf8dcd3 | 735 | } |
6b0c7440 AG |
736 | |
737 | /* | |
738 | * Drop the remaining glock references manually here. (Mind that | |
739 | * __gfs2_glock_queue_work depends on the lockref spinlock begin held | |
740 | * here as well.) | |
741 | */ | |
742 | gl->gl_lockref.count -= drop_refs; | |
743 | if (!gl->gl_lockref.count) { | |
744 | __gfs2_glock_put(gl); | |
745 | return; | |
746 | } | |
747 | spin_unlock(&gl->gl_lockref.lock); | |
c4f68a13 BM |
748 | } |
749 | ||
0515480a AG |
750 | static struct gfs2_glock *find_insert_glock(struct lm_lockname *name, |
751 | struct gfs2_glock *new) | |
752 | { | |
753 | struct wait_glock_queue wait; | |
a91323e2 | 754 | wait_queue_head_t *wq = glock_waitqueue(name); |
0515480a AG |
755 | struct gfs2_glock *gl; |
756 | ||
a91323e2 AG |
757 | wait.name = name; |
758 | init_wait(&wait.wait); | |
759 | wait.wait.func = glock_wake_function; | |
760 | ||
0515480a | 761 | again: |
a91323e2 | 762 | prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE); |
0515480a AG |
763 | rcu_read_lock(); |
764 | if (new) { | |
765 | gl = rhashtable_lookup_get_insert_fast(&gl_hash_table, | |
766 | &new->gl_node, ht_parms); | |
767 | if (IS_ERR(gl)) | |
768 | goto out; | |
769 | } else { | |
770 | gl = rhashtable_lookup_fast(&gl_hash_table, | |
771 | name, ht_parms); | |
772 | } | |
773 | if (gl && !lockref_get_not_dead(&gl->gl_lockref)) { | |
774 | rcu_read_unlock(); | |
775 | schedule(); | |
776 | goto again; | |
777 | } | |
778 | out: | |
779 | rcu_read_unlock(); | |
a91323e2 | 780 | finish_wait(wq, &wait.wait); |
0515480a AG |
781 | return gl; |
782 | } | |
783 | ||
b3b94faa DT |
784 | /** |
785 | * gfs2_glock_get() - Get a glock, or create one if one doesn't exist | |
786 | * @sdp: The GFS2 superblock | |
787 | * @number: the lock number | |
788 | * @glops: The glock_operations to use | |
789 | * @create: If 0, don't create the glock if it doesn't exist | |
790 | * @glp: the glock is returned here | |
791 | * | |
792 | * This does not lock a glock, just finds/creates structures for one. | |
793 | * | |
794 | * Returns: errno | |
795 | */ | |
796 | ||
cd915493 | 797 | int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 | 798 | const struct gfs2_glock_operations *glops, int create, |
b3b94faa DT |
799 | struct gfs2_glock **glp) |
800 | { | |
009d8518 | 801 | struct super_block *s = sdp->sd_vfs; |
15562c43 BP |
802 | struct lm_lockname name = { .ln_number = number, |
803 | .ln_type = glops->go_type, | |
804 | .ln_sbd = sdp }; | |
0a52aba7 | 805 | struct gfs2_glock *gl, *tmp; |
009d8518 | 806 | struct address_space *mapping; |
bc015cb8 | 807 | struct kmem_cache *cachep; |
0a52aba7 | 808 | int ret = 0; |
b3b94faa | 809 | |
0515480a AG |
810 | gl = find_insert_glock(&name, NULL); |
811 | if (gl) { | |
812 | *glp = gl; | |
b3b94faa | 813 | return 0; |
0515480a | 814 | } |
64d576ba SW |
815 | if (!create) |
816 | return -ENOENT; | |
b3b94faa | 817 | |
009d8518 | 818 | if (glops->go_flags & GLOF_ASPACE) |
bc015cb8 | 819 | cachep = gfs2_glock_aspace_cachep; |
009d8518 | 820 | else |
bc015cb8 | 821 | cachep = gfs2_glock_cachep; |
fe0bbd29 | 822 | gl = kmem_cache_alloc(cachep, GFP_NOFS); |
b3b94faa DT |
823 | if (!gl) |
824 | return -ENOMEM; | |
825 | ||
dba2d70c | 826 | memset(&gl->gl_lksb, 0, sizeof(struct dlm_lksb)); |
dba2d70c DT |
827 | |
828 | if (glops->go_flags & GLOF_LVB) { | |
fe0bbd29 | 829 | gl->gl_lksb.sb_lvbptr = kzalloc(GFS2_MIN_LVB_SIZE, GFP_NOFS); |
4e2f8849 | 830 | if (!gl->gl_lksb.sb_lvbptr) { |
dba2d70c DT |
831 | kmem_cache_free(cachep, gl); |
832 | return -ENOMEM; | |
833 | } | |
dba2d70c DT |
834 | } |
835 | ||
8f05228e | 836 | atomic_inc(&sdp->sd_glock_disposal); |
88ffbf3e | 837 | gl->gl_node.next = NULL; |
ec45d9f5 | 838 | gl->gl_flags = 0; |
b3b94faa | 839 | gl->gl_name = name; |
e66cf161 | 840 | gl->gl_lockref.count = 1; |
b3b94faa | 841 | gl->gl_state = LM_ST_UNLOCKED; |
6802e340 | 842 | gl->gl_target = LM_ST_UNLOCKED; |
c4f68a13 | 843 | gl->gl_demote_state = LM_ST_EXCLUSIVE; |
b3b94faa | 844 | gl->gl_ops = glops; |
8b0e1953 | 845 | gl->gl_dstamp = 0; |
a245769f SW |
846 | preempt_disable(); |
847 | /* We use the global stats to estimate the initial per-glock stats */ | |
848 | gl->gl_stats = this_cpu_ptr(sdp->sd_lkstats)->lkstats[glops->go_type]; | |
849 | preempt_enable(); | |
850 | gl->gl_stats.stats[GFS2_LKS_DCOUNT] = 0; | |
851 | gl->gl_stats.stats[GFS2_LKS_QCOUNT] = 0; | |
c4f68a13 | 852 | gl->gl_tchange = jiffies; |
ec45d9f5 | 853 | gl->gl_object = NULL; |
7cf8dcd3 | 854 | gl->gl_hold_time = GL_GLOCK_DFT_HOLD; |
c4f68a13 | 855 | INIT_DELAYED_WORK(&gl->gl_work, glock_work_func); |
b94a170e | 856 | INIT_WORK(&gl->gl_delete, delete_work_func); |
b3b94faa | 857 | |
009d8518 SW |
858 | mapping = gfs2_glock2aspace(gl); |
859 | if (mapping) { | |
860 | mapping->a_ops = &gfs2_meta_aops; | |
861 | mapping->host = s->s_bdev->bd_inode; | |
862 | mapping->flags = 0; | |
863 | mapping_set_gfp_mask(mapping, GFP_NOFS); | |
252aa6f5 | 864 | mapping->private_data = NULL; |
009d8518 | 865 | mapping->writeback_index = 0; |
b3b94faa DT |
866 | } |
867 | ||
0515480a | 868 | tmp = find_insert_glock(&name, gl); |
0a52aba7 | 869 | if (!tmp) { |
88ffbf3e | 870 | *glp = gl; |
0a52aba7 | 871 | goto out; |
b3b94faa | 872 | } |
0a52aba7 AG |
873 | if (IS_ERR(tmp)) { |
874 | ret = PTR_ERR(tmp); | |
875 | goto out_free; | |
876 | } | |
0515480a | 877 | *glp = tmp; |
0a52aba7 AG |
878 | |
879 | out_free: | |
88ffbf3e BP |
880 | kfree(gl->gl_lksb.sb_lvbptr); |
881 | kmem_cache_free(cachep, gl); | |
882 | atomic_dec(&sdp->sd_glock_disposal); | |
b3b94faa | 883 | |
0a52aba7 | 884 | out: |
88ffbf3e | 885 | return ret; |
b3b94faa DT |
886 | } |
887 | ||
888 | /** | |
889 | * gfs2_holder_init - initialize a struct gfs2_holder in the default way | |
890 | * @gl: the glock | |
891 | * @state: the state we're requesting | |
892 | * @flags: the modifier flags | |
893 | * @gh: the holder structure | |
894 | * | |
895 | */ | |
896 | ||
b58bf407 | 897 | void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, u16 flags, |
b3b94faa DT |
898 | struct gfs2_holder *gh) |
899 | { | |
900 | INIT_LIST_HEAD(&gh->gh_list); | |
901 | gh->gh_gl = gl; | |
d29c0afe | 902 | gh->gh_ip = _RET_IP_; |
b1e058da | 903 | gh->gh_owner_pid = get_pid(task_pid(current)); |
b3b94faa DT |
904 | gh->gh_state = state; |
905 | gh->gh_flags = flags; | |
906 | gh->gh_error = 0; | |
907 | gh->gh_iflags = 0; | |
b3b94faa DT |
908 | gfs2_glock_hold(gl); |
909 | } | |
910 | ||
911 | /** | |
912 | * gfs2_holder_reinit - reinitialize a struct gfs2_holder so we can requeue it | |
913 | * @state: the state we're requesting | |
914 | * @flags: the modifier flags | |
915 | * @gh: the holder structure | |
916 | * | |
917 | * Don't mess with the glock. | |
918 | * | |
919 | */ | |
920 | ||
b58bf407 | 921 | void gfs2_holder_reinit(unsigned int state, u16 flags, struct gfs2_holder *gh) |
b3b94faa DT |
922 | { |
923 | gh->gh_state = state; | |
579b78a4 | 924 | gh->gh_flags = flags; |
3b8249f6 | 925 | gh->gh_iflags = 0; |
d29c0afe | 926 | gh->gh_ip = _RET_IP_; |
30badc95 | 927 | put_pid(gh->gh_owner_pid); |
1a0eae88 | 928 | gh->gh_owner_pid = get_pid(task_pid(current)); |
b3b94faa DT |
929 | } |
930 | ||
931 | /** | |
932 | * gfs2_holder_uninit - uninitialize a holder structure (drop glock reference) | |
933 | * @gh: the holder structure | |
934 | * | |
935 | */ | |
936 | ||
937 | void gfs2_holder_uninit(struct gfs2_holder *gh) | |
938 | { | |
b1e058da | 939 | put_pid(gh->gh_owner_pid); |
b3b94faa | 940 | gfs2_glock_put(gh->gh_gl); |
6df9f9a2 | 941 | gfs2_holder_mark_uninitialized(gh); |
d0dc80db | 942 | gh->gh_ip = 0; |
b3b94faa DT |
943 | } |
944 | ||
01123cf1 AG |
945 | static void gfs2_glock_update_hold_time(struct gfs2_glock *gl, |
946 | unsigned long start_time) | |
947 | { | |
948 | /* Have we waited longer that a second? */ | |
949 | if (time_after(jiffies, start_time + HZ)) { | |
950 | /* Lengthen the minimum hold time. */ | |
951 | gl->gl_hold_time = min(gl->gl_hold_time + GL_GLOCK_HOLD_INCR, | |
952 | GL_GLOCK_MAX_HOLD); | |
953 | } | |
954 | } | |
955 | ||
07a79049 BP |
956 | /** |
957 | * gfs2_glock_wait - wait on a glock acquisition | |
958 | * @gh: the glock holder | |
959 | * | |
960 | * Returns: 0 on success | |
961 | */ | |
962 | ||
963 | int gfs2_glock_wait(struct gfs2_holder *gh) | |
da755fdb | 964 | { |
01123cf1 | 965 | unsigned long start_time = jiffies; |
7cf8dcd3 | 966 | |
6802e340 | 967 | might_sleep(); |
74316201 | 968 | wait_on_bit(&gh->gh_iflags, HIF_WAIT, TASK_UNINTERRUPTIBLE); |
01123cf1 | 969 | gfs2_glock_update_hold_time(gh->gh_gl, start_time); |
07a79049 | 970 | return gh->gh_error; |
da755fdb SW |
971 | } |
972 | ||
ad26967b BP |
973 | static int glocks_pending(unsigned int num_gh, struct gfs2_holder *ghs) |
974 | { | |
975 | int i; | |
976 | ||
977 | for (i = 0; i < num_gh; i++) | |
978 | if (test_bit(HIF_WAIT, &ghs[i].gh_iflags)) | |
979 | return 1; | |
980 | return 0; | |
981 | } | |
982 | ||
983 | /** | |
984 | * gfs2_glock_async_wait - wait on multiple asynchronous glock acquisitions | |
985 | * @num_gh: the number of holders in the array | |
986 | * @ghs: the glock holder array | |
987 | * | |
988 | * Returns: 0 on success, meaning all glocks have been granted and are held. | |
989 | * -ESTALE if the request timed out, meaning all glocks were released, | |
990 | * and the caller should retry the operation. | |
991 | */ | |
992 | ||
993 | int gfs2_glock_async_wait(unsigned int num_gh, struct gfs2_holder *ghs) | |
994 | { | |
995 | struct gfs2_sbd *sdp = ghs[0].gh_gl->gl_name.ln_sbd; | |
996 | int i, ret = 0, timeout = 0; | |
997 | unsigned long start_time = jiffies; | |
998 | bool keep_waiting; | |
999 | ||
1000 | might_sleep(); | |
1001 | /* | |
1002 | * Total up the (minimum hold time * 2) of all glocks and use that to | |
1003 | * determine the max amount of time we should wait. | |
1004 | */ | |
1005 | for (i = 0; i < num_gh; i++) | |
1006 | timeout += ghs[i].gh_gl->gl_hold_time << 1; | |
1007 | ||
1008 | wait_for_dlm: | |
1009 | if (!wait_event_timeout(sdp->sd_async_glock_wait, | |
1010 | !glocks_pending(num_gh, ghs), timeout)) | |
1011 | ret = -ESTALE; /* request timed out. */ | |
1012 | ||
1013 | /* | |
1014 | * If dlm granted all our requests, we need to adjust the glock | |
1015 | * minimum hold time values according to how long we waited. | |
1016 | * | |
1017 | * If our request timed out, we need to repeatedly release any held | |
1018 | * glocks we acquired thus far to allow dlm to acquire the remaining | |
1019 | * glocks without deadlocking. We cannot currently cancel outstanding | |
1020 | * glock acquisitions. | |
1021 | * | |
1022 | * The HIF_WAIT bit tells us which requests still need a response from | |
1023 | * dlm. | |
1024 | * | |
1025 | * If dlm sent us any errors, we return the first error we find. | |
1026 | */ | |
1027 | keep_waiting = false; | |
1028 | for (i = 0; i < num_gh; i++) { | |
1029 | /* Skip holders we have already dequeued below. */ | |
1030 | if (!gfs2_holder_queued(&ghs[i])) | |
1031 | continue; | |
1032 | /* Skip holders with a pending DLM response. */ | |
1033 | if (test_bit(HIF_WAIT, &ghs[i].gh_iflags)) { | |
1034 | keep_waiting = true; | |
1035 | continue; | |
1036 | } | |
1037 | ||
1038 | if (test_bit(HIF_HOLDER, &ghs[i].gh_iflags)) { | |
1039 | if (ret == -ESTALE) | |
1040 | gfs2_glock_dq(&ghs[i]); | |
1041 | else | |
1042 | gfs2_glock_update_hold_time(ghs[i].gh_gl, | |
1043 | start_time); | |
1044 | } | |
1045 | if (!ret) | |
1046 | ret = ghs[i].gh_error; | |
1047 | } | |
1048 | ||
1049 | if (keep_waiting) | |
1050 | goto wait_for_dlm; | |
1051 | ||
1052 | /* | |
1053 | * At this point, we've either acquired all locks or released them all. | |
1054 | */ | |
1055 | return ret; | |
1056 | } | |
1057 | ||
b3b94faa | 1058 | /** |
6802e340 SW |
1059 | * handle_callback - process a demote request |
1060 | * @gl: the glock | |
1061 | * @state: the state the caller wants us to change to | |
b3b94faa | 1062 | * |
6802e340 SW |
1063 | * There are only two requests that we are going to see in actual |
1064 | * practise: LM_ST_SHARED and LM_ST_UNLOCKED | |
b3b94faa DT |
1065 | */ |
1066 | ||
6802e340 | 1067 | static void handle_callback(struct gfs2_glock *gl, unsigned int state, |
81ffbf65 | 1068 | unsigned long delay, bool remote) |
b3b94faa | 1069 | { |
6802e340 | 1070 | int bit = delay ? GLF_PENDING_DEMOTE : GLF_DEMOTE; |
b3b94faa | 1071 | |
6802e340 SW |
1072 | set_bit(bit, &gl->gl_flags); |
1073 | if (gl->gl_demote_state == LM_ST_EXCLUSIVE) { | |
1074 | gl->gl_demote_state = state; | |
1075 | gl->gl_demote_time = jiffies; | |
6802e340 SW |
1076 | } else if (gl->gl_demote_state != LM_ST_UNLOCKED && |
1077 | gl->gl_demote_state != state) { | |
1078 | gl->gl_demote_state = LM_ST_UNLOCKED; | |
b3b94faa | 1079 | } |
b94a170e | 1080 | if (gl->gl_ops->go_callback) |
81ffbf65 | 1081 | gl->gl_ops->go_callback(gl, remote); |
7bd8b2eb | 1082 | trace_gfs2_demote_rq(gl, remote); |
b3b94faa DT |
1083 | } |
1084 | ||
6802e340 | 1085 | void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...) |
7c52b166 | 1086 | { |
5e69069c | 1087 | struct va_format vaf; |
7c52b166 RP |
1088 | va_list args; |
1089 | ||
1090 | va_start(args, fmt); | |
5e69069c | 1091 | |
6802e340 | 1092 | if (seq) { |
1bb49303 | 1093 | seq_vprintf(seq, fmt, args); |
6802e340 | 1094 | } else { |
5e69069c JP |
1095 | vaf.fmt = fmt; |
1096 | vaf.va = &args; | |
1097 | ||
d77d1b58 | 1098 | pr_err("%pV", &vaf); |
6802e340 | 1099 | } |
5e69069c | 1100 | |
7c52b166 RP |
1101 | va_end(args); |
1102 | } | |
1103 | ||
b3b94faa DT |
1104 | /** |
1105 | * add_to_queue - Add a holder to the wait queue (but look for recursion) | |
1106 | * @gh: the holder structure to add | |
1107 | * | |
6802e340 SW |
1108 | * Eventually we should move the recursive locking trap to a |
1109 | * debugging option or something like that. This is the fast | |
1110 | * path and needs to have the minimum number of distractions. | |
1111 | * | |
b3b94faa DT |
1112 | */ |
1113 | ||
6802e340 | 1114 | static inline void add_to_queue(struct gfs2_holder *gh) |
f3dd1649 AG |
1115 | __releases(&gl->gl_lockref.lock) |
1116 | __acquires(&gl->gl_lockref.lock) | |
b3b94faa DT |
1117 | { |
1118 | struct gfs2_glock *gl = gh->gh_gl; | |
15562c43 | 1119 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
6802e340 SW |
1120 | struct list_head *insert_pt = NULL; |
1121 | struct gfs2_holder *gh2; | |
e5dc76b9 | 1122 | int try_futile = 0; |
b3b94faa | 1123 | |
ad26967b | 1124 | GLOCK_BUG_ON(gl, gh->gh_owner_pid == NULL); |
fee852e3 | 1125 | if (test_and_set_bit(HIF_WAIT, &gh->gh_iflags)) |
ad26967b | 1126 | GLOCK_BUG_ON(gl, true); |
190562bd | 1127 | |
6802e340 SW |
1128 | if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { |
1129 | if (test_bit(GLF_LOCK, &gl->gl_flags)) | |
e5dc76b9 | 1130 | try_futile = !may_grant(gl, gh); |
6802e340 SW |
1131 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags)) |
1132 | goto fail; | |
1133 | } | |
1134 | ||
1135 | list_for_each_entry(gh2, &gl->gl_holders, gh_list) { | |
1136 | if (unlikely(gh2->gh_owner_pid == gh->gh_owner_pid && | |
1137 | (gh->gh_gl->gl_ops->go_type != LM_TYPE_FLOCK))) | |
1138 | goto trap_recursive; | |
e5dc76b9 BP |
1139 | if (try_futile && |
1140 | !(gh2->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) { | |
6802e340 SW |
1141 | fail: |
1142 | gh->gh_error = GLR_TRYFAILED; | |
1143 | gfs2_holder_wake(gh); | |
1144 | return; | |
b4c20166 | 1145 | } |
6802e340 SW |
1146 | if (test_bit(HIF_HOLDER, &gh2->gh_iflags)) |
1147 | continue; | |
1148 | if (unlikely((gh->gh_flags & LM_FLAG_PRIORITY) && !insert_pt)) | |
1149 | insert_pt = &gh2->gh_list; | |
1150 | } | |
7b5e3d5f | 1151 | set_bit(GLF_QUEUED, &gl->gl_flags); |
edae38a6 | 1152 | trace_gfs2_glock_queue(gh, 1); |
a245769f SW |
1153 | gfs2_glstats_inc(gl, GFS2_LKS_QCOUNT); |
1154 | gfs2_sbstats_inc(gl, GFS2_LKS_QCOUNT); | |
6802e340 SW |
1155 | if (likely(insert_pt == NULL)) { |
1156 | list_add_tail(&gh->gh_list, &gl->gl_holders); | |
1157 | if (unlikely(gh->gh_flags & LM_FLAG_PRIORITY)) | |
1158 | goto do_cancel; | |
1159 | return; | |
1160 | } | |
1161 | list_add_tail(&gh->gh_list, insert_pt); | |
1162 | do_cancel: | |
1163 | gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list); | |
1164 | if (!(gh->gh_flags & LM_FLAG_PRIORITY)) { | |
f3dd1649 | 1165 | spin_unlock(&gl->gl_lockref.lock); |
048bca22 | 1166 | if (sdp->sd_lockstruct.ls_ops->lm_cancel) |
f057f6cd | 1167 | sdp->sd_lockstruct.ls_ops->lm_cancel(gl); |
f3dd1649 | 1168 | spin_lock(&gl->gl_lockref.lock); |
b3b94faa | 1169 | } |
6802e340 | 1170 | return; |
b3b94faa | 1171 | |
6802e340 | 1172 | trap_recursive: |
e54c78a2 BP |
1173 | fs_err(sdp, "original: %pSR\n", (void *)gh2->gh_ip); |
1174 | fs_err(sdp, "pid: %d\n", pid_nr(gh2->gh_owner_pid)); | |
1175 | fs_err(sdp, "lock type: %d req lock state : %d\n", | |
6802e340 | 1176 | gh2->gh_gl->gl_name.ln_type, gh2->gh_state); |
e54c78a2 BP |
1177 | fs_err(sdp, "new: %pSR\n", (void *)gh->gh_ip); |
1178 | fs_err(sdp, "pid: %d\n", pid_nr(gh->gh_owner_pid)); | |
1179 | fs_err(sdp, "lock type: %d req lock state : %d\n", | |
6802e340 | 1180 | gh->gh_gl->gl_name.ln_type, gh->gh_state); |
3792ce97 | 1181 | gfs2_dump_glock(NULL, gl, true); |
6802e340 | 1182 | BUG(); |
b3b94faa DT |
1183 | } |
1184 | ||
1185 | /** | |
1186 | * gfs2_glock_nq - enqueue a struct gfs2_holder onto a glock (acquire a glock) | |
1187 | * @gh: the holder structure | |
1188 | * | |
1189 | * if (gh->gh_flags & GL_ASYNC), this never returns an error | |
1190 | * | |
1191 | * Returns: 0, GLR_TRYFAILED, or errno on failure | |
1192 | */ | |
1193 | ||
1194 | int gfs2_glock_nq(struct gfs2_holder *gh) | |
1195 | { | |
1196 | struct gfs2_glock *gl = gh->gh_gl; | |
15562c43 | 1197 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
b3b94faa DT |
1198 | int error = 0; |
1199 | ||
eb43e660 | 1200 | if (unlikely(gfs2_withdrawn(sdp))) |
b3b94faa | 1201 | return -EIO; |
b3b94faa | 1202 | |
f42ab085 SW |
1203 | if (test_bit(GLF_LRU, &gl->gl_flags)) |
1204 | gfs2_glock_remove_from_lru(gl); | |
1205 | ||
f3dd1649 | 1206 | spin_lock(&gl->gl_lockref.lock); |
b3b94faa | 1207 | add_to_queue(gh); |
01b172b7 BP |
1208 | if (unlikely((LM_FLAG_NOEXP & gh->gh_flags) && |
1209 | test_and_clear_bit(GLF_FROZEN, &gl->gl_flags))) { | |
0809f6ec | 1210 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
01b172b7 | 1211 | gl->gl_lockref.count++; |
6b0c7440 | 1212 | __gfs2_glock_queue_work(gl, 0); |
01b172b7 | 1213 | } |
6802e340 | 1214 | run_queue(gl, 1); |
f3dd1649 | 1215 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa | 1216 | |
6802e340 SW |
1217 | if (!(gh->gh_flags & GL_ASYNC)) |
1218 | error = gfs2_glock_wait(gh); | |
b3b94faa | 1219 | |
b3b94faa DT |
1220 | return error; |
1221 | } | |
1222 | ||
1223 | /** | |
1224 | * gfs2_glock_poll - poll to see if an async request has been completed | |
1225 | * @gh: the holder | |
1226 | * | |
1227 | * Returns: 1 if the request is ready to be gfs2_glock_wait()ed on | |
1228 | */ | |
1229 | ||
1230 | int gfs2_glock_poll(struct gfs2_holder *gh) | |
1231 | { | |
6802e340 | 1232 | return test_bit(HIF_WAIT, &gh->gh_iflags) ? 0 : 1; |
b3b94faa DT |
1233 | } |
1234 | ||
1235 | /** | |
1236 | * gfs2_glock_dq - dequeue a struct gfs2_holder from a glock (release a glock) | |
1237 | * @gh: the glock holder | |
1238 | * | |
1239 | */ | |
1240 | ||
1241 | void gfs2_glock_dq(struct gfs2_holder *gh) | |
1242 | { | |
1243 | struct gfs2_glock *gl = gh->gh_gl; | |
8fb4b536 | 1244 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
c4f68a13 | 1245 | unsigned delay = 0; |
6802e340 | 1246 | int fast_path = 0; |
b3b94faa | 1247 | |
f3dd1649 | 1248 | spin_lock(&gl->gl_lockref.lock); |
b3b94faa | 1249 | if (gh->gh_flags & GL_NOCACHE) |
81ffbf65 | 1250 | handle_callback(gl, LM_ST_UNLOCKED, 0, false); |
b3b94faa | 1251 | |
b3b94faa | 1252 | list_del_init(&gh->gh_list); |
7508abc4 | 1253 | clear_bit(HIF_HOLDER, &gh->gh_iflags); |
6802e340 | 1254 | if (find_first_holder(gl) == NULL) { |
3042a2cc | 1255 | if (glops->go_unlock) { |
6802e340 | 1256 | GLOCK_BUG_ON(gl, test_and_set_bit(GLF_LOCK, &gl->gl_flags)); |
f3dd1649 | 1257 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa | 1258 | glops->go_unlock(gh); |
f3dd1649 | 1259 | spin_lock(&gl->gl_lockref.lock); |
6802e340 | 1260 | clear_bit(GLF_LOCK, &gl->gl_flags); |
3042a2cc | 1261 | } |
6802e340 SW |
1262 | if (list_empty(&gl->gl_holders) && |
1263 | !test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && | |
1264 | !test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
1265 | fast_path = 1; | |
b3b94faa | 1266 | } |
7881ef3f | 1267 | if (!test_bit(GLF_LFLUSH, &gl->gl_flags) && demote_ok(gl)) |
4abb6ad9 BP |
1268 | gfs2_glock_add_to_lru(gl); |
1269 | ||
63997775 | 1270 | trace_gfs2_glock_queue(gh, 0); |
6b0c7440 AG |
1271 | if (unlikely(!fast_path)) { |
1272 | gl->gl_lockref.count++; | |
1273 | if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && | |
1274 | !test_bit(GLF_DEMOTE, &gl->gl_flags) && | |
1275 | gl->gl_name.ln_type == LM_TYPE_INODE) | |
1276 | delay = gl->gl_hold_time; | |
1277 | __gfs2_glock_queue_work(gl, delay); | |
1278 | } | |
f3dd1649 | 1279 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa DT |
1280 | } |
1281 | ||
d93cfa98 AD |
1282 | void gfs2_glock_dq_wait(struct gfs2_holder *gh) |
1283 | { | |
1284 | struct gfs2_glock *gl = gh->gh_gl; | |
1285 | gfs2_glock_dq(gh); | |
81e1d450 | 1286 | might_sleep(); |
74316201 | 1287 | wait_on_bit(&gl->gl_flags, GLF_DEMOTE, TASK_UNINTERRUPTIBLE); |
d93cfa98 AD |
1288 | } |
1289 | ||
b3b94faa DT |
1290 | /** |
1291 | * gfs2_glock_dq_uninit - dequeue a holder from a glock and initialize it | |
1292 | * @gh: the holder structure | |
1293 | * | |
1294 | */ | |
1295 | ||
1296 | void gfs2_glock_dq_uninit(struct gfs2_holder *gh) | |
1297 | { | |
1298 | gfs2_glock_dq(gh); | |
1299 | gfs2_holder_uninit(gh); | |
1300 | } | |
1301 | ||
1302 | /** | |
1303 | * gfs2_glock_nq_num - acquire a glock based on lock number | |
1304 | * @sdp: the filesystem | |
1305 | * @number: the lock number | |
1306 | * @glops: the glock operations for the type of glock | |
1307 | * @state: the state to acquire the glock in | |
25985edc | 1308 | * @flags: modifier flags for the acquisition |
b3b94faa DT |
1309 | * @gh: the struct gfs2_holder |
1310 | * | |
1311 | * Returns: errno | |
1312 | */ | |
1313 | ||
cd915493 | 1314 | int gfs2_glock_nq_num(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 | 1315 | const struct gfs2_glock_operations *glops, |
b58bf407 | 1316 | unsigned int state, u16 flags, struct gfs2_holder *gh) |
b3b94faa DT |
1317 | { |
1318 | struct gfs2_glock *gl; | |
1319 | int error; | |
1320 | ||
1321 | error = gfs2_glock_get(sdp, number, glops, CREATE, &gl); | |
1322 | if (!error) { | |
1323 | error = gfs2_glock_nq_init(gl, state, flags, gh); | |
1324 | gfs2_glock_put(gl); | |
1325 | } | |
1326 | ||
1327 | return error; | |
1328 | } | |
1329 | ||
1330 | /** | |
1331 | * glock_compare - Compare two struct gfs2_glock structures for sorting | |
1332 | * @arg_a: the first structure | |
1333 | * @arg_b: the second structure | |
1334 | * | |
1335 | */ | |
1336 | ||
1337 | static int glock_compare(const void *arg_a, const void *arg_b) | |
1338 | { | |
a5e08a9e SW |
1339 | const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a; |
1340 | const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b; | |
1341 | const struct lm_lockname *a = &gh_a->gh_gl->gl_name; | |
1342 | const struct lm_lockname *b = &gh_b->gh_gl->gl_name; | |
b3b94faa DT |
1343 | |
1344 | if (a->ln_number > b->ln_number) | |
a5e08a9e SW |
1345 | return 1; |
1346 | if (a->ln_number < b->ln_number) | |
1347 | return -1; | |
1c0f4872 | 1348 | BUG_ON(gh_a->gh_gl->gl_ops->go_type == gh_b->gh_gl->gl_ops->go_type); |
a5e08a9e | 1349 | return 0; |
b3b94faa DT |
1350 | } |
1351 | ||
1352 | /** | |
1353 | * nq_m_sync - synchonously acquire more than one glock in deadlock free order | |
1354 | * @num_gh: the number of structures | |
1355 | * @ghs: an array of struct gfs2_holder structures | |
1356 | * | |
1357 | * Returns: 0 on success (all glocks acquired), | |
1358 | * errno on failure (no glocks acquired) | |
1359 | */ | |
1360 | ||
1361 | static int nq_m_sync(unsigned int num_gh, struct gfs2_holder *ghs, | |
1362 | struct gfs2_holder **p) | |
1363 | { | |
1364 | unsigned int x; | |
1365 | int error = 0; | |
1366 | ||
1367 | for (x = 0; x < num_gh; x++) | |
1368 | p[x] = &ghs[x]; | |
1369 | ||
1370 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare, NULL); | |
1371 | ||
1372 | for (x = 0; x < num_gh; x++) { | |
1373 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1374 | ||
1375 | error = gfs2_glock_nq(p[x]); | |
1376 | if (error) { | |
1377 | while (x--) | |
1378 | gfs2_glock_dq(p[x]); | |
1379 | break; | |
1380 | } | |
1381 | } | |
1382 | ||
1383 | return error; | |
1384 | } | |
1385 | ||
1386 | /** | |
1387 | * gfs2_glock_nq_m - acquire multiple glocks | |
1388 | * @num_gh: the number of structures | |
1389 | * @ghs: an array of struct gfs2_holder structures | |
1390 | * | |
b3b94faa DT |
1391 | * |
1392 | * Returns: 0 on success (all glocks acquired), | |
1393 | * errno on failure (no glocks acquired) | |
1394 | */ | |
1395 | ||
1396 | int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1397 | { | |
eaf5bd3c SW |
1398 | struct gfs2_holder *tmp[4]; |
1399 | struct gfs2_holder **pph = tmp; | |
b3b94faa DT |
1400 | int error = 0; |
1401 | ||
eaf5bd3c SW |
1402 | switch(num_gh) { |
1403 | case 0: | |
b3b94faa | 1404 | return 0; |
eaf5bd3c | 1405 | case 1: |
b3b94faa DT |
1406 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); |
1407 | return gfs2_glock_nq(ghs); | |
eaf5bd3c SW |
1408 | default: |
1409 | if (num_gh <= 4) | |
b3b94faa | 1410 | break; |
6da2ec56 KC |
1411 | pph = kmalloc_array(num_gh, sizeof(struct gfs2_holder *), |
1412 | GFP_NOFS); | |
eaf5bd3c SW |
1413 | if (!pph) |
1414 | return -ENOMEM; | |
b3b94faa DT |
1415 | } |
1416 | ||
eaf5bd3c | 1417 | error = nq_m_sync(num_gh, ghs, pph); |
b3b94faa | 1418 | |
eaf5bd3c SW |
1419 | if (pph != tmp) |
1420 | kfree(pph); | |
b3b94faa DT |
1421 | |
1422 | return error; | |
1423 | } | |
1424 | ||
1425 | /** | |
1426 | * gfs2_glock_dq_m - release multiple glocks | |
1427 | * @num_gh: the number of structures | |
1428 | * @ghs: an array of struct gfs2_holder structures | |
1429 | * | |
1430 | */ | |
1431 | ||
1432 | void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1433 | { | |
fa1bbdea BP |
1434 | while (num_gh--) |
1435 | gfs2_glock_dq(&ghs[num_gh]); | |
b3b94faa DT |
1436 | } |
1437 | ||
f057f6cd | 1438 | void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state) |
da755fdb | 1439 | { |
c4f68a13 BM |
1440 | unsigned long delay = 0; |
1441 | unsigned long holdtime; | |
1442 | unsigned long now = jiffies; | |
b3b94faa | 1443 | |
f057f6cd | 1444 | gfs2_glock_hold(gl); |
7cf8dcd3 BP |
1445 | holdtime = gl->gl_tchange + gl->gl_hold_time; |
1446 | if (test_bit(GLF_QUEUED, &gl->gl_flags) && | |
1447 | gl->gl_name.ln_type == LM_TYPE_INODE) { | |
7b5e3d5f SW |
1448 | if (time_before(now, holdtime)) |
1449 | delay = holdtime - now; | |
1450 | if (test_bit(GLF_REPLY_PENDING, &gl->gl_flags)) | |
7cf8dcd3 | 1451 | delay = gl->gl_hold_time; |
7b5e3d5f | 1452 | } |
b3b94faa | 1453 | |
f3dd1649 | 1454 | spin_lock(&gl->gl_lockref.lock); |
81ffbf65 | 1455 | handle_callback(gl, state, delay, true); |
6b0c7440 | 1456 | __gfs2_glock_queue_work(gl, delay); |
f3dd1649 | 1457 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa DT |
1458 | } |
1459 | ||
0809f6ec SW |
1460 | /** |
1461 | * gfs2_should_freeze - Figure out if glock should be frozen | |
1462 | * @gl: The glock in question | |
1463 | * | |
1464 | * Glocks are not frozen if (a) the result of the dlm operation is | |
1465 | * an error, (b) the locking operation was an unlock operation or | |
1466 | * (c) if there is a "noexp" flagged request anywhere in the queue | |
1467 | * | |
1468 | * Returns: 1 if freezing should occur, 0 otherwise | |
1469 | */ | |
1470 | ||
1471 | static int gfs2_should_freeze(const struct gfs2_glock *gl) | |
1472 | { | |
1473 | const struct gfs2_holder *gh; | |
1474 | ||
1475 | if (gl->gl_reply & ~LM_OUT_ST_MASK) | |
1476 | return 0; | |
1477 | if (gl->gl_target == LM_ST_UNLOCKED) | |
1478 | return 0; | |
1479 | ||
1480 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
1481 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
1482 | continue; | |
1483 | if (LM_FLAG_NOEXP & gh->gh_flags) | |
1484 | return 0; | |
1485 | } | |
1486 | ||
1487 | return 1; | |
1488 | } | |
1489 | ||
b3b94faa | 1490 | /** |
f057f6cd SW |
1491 | * gfs2_glock_complete - Callback used by locking |
1492 | * @gl: Pointer to the glock | |
1493 | * @ret: The return value from the dlm | |
b3b94faa | 1494 | * |
f3dd1649 | 1495 | * The gl_reply field is under the gl_lockref.lock lock so that it is ok |
47a25380 | 1496 | * to use a bitfield shared with other glock state fields. |
b3b94faa DT |
1497 | */ |
1498 | ||
f057f6cd | 1499 | void gfs2_glock_complete(struct gfs2_glock *gl, int ret) |
b3b94faa | 1500 | { |
15562c43 | 1501 | struct lm_lockstruct *ls = &gl->gl_name.ln_sbd->sd_lockstruct; |
0809f6ec | 1502 | |
f3dd1649 | 1503 | spin_lock(&gl->gl_lockref.lock); |
f057f6cd | 1504 | gl->gl_reply = ret; |
0809f6ec | 1505 | |
e0c2a9aa | 1506 | if (unlikely(test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))) { |
0809f6ec | 1507 | if (gfs2_should_freeze(gl)) { |
f057f6cd | 1508 | set_bit(GLF_FROZEN, &gl->gl_flags); |
f3dd1649 | 1509 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa | 1510 | return; |
0809f6ec | 1511 | } |
b3b94faa | 1512 | } |
47a25380 | 1513 | |
e66cf161 | 1514 | gl->gl_lockref.count++; |
f057f6cd | 1515 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
6b0c7440 | 1516 | __gfs2_glock_queue_work(gl, 0); |
f3dd1649 | 1517 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa DT |
1518 | } |
1519 | ||
4506a519 SW |
1520 | static int glock_cmp(void *priv, struct list_head *a, struct list_head *b) |
1521 | { | |
1522 | struct gfs2_glock *gla, *glb; | |
1523 | ||
1524 | gla = list_entry(a, struct gfs2_glock, gl_lru); | |
1525 | glb = list_entry(b, struct gfs2_glock, gl_lru); | |
1526 | ||
1527 | if (gla->gl_name.ln_number > glb->gl_name.ln_number) | |
1528 | return 1; | |
1529 | if (gla->gl_name.ln_number < glb->gl_name.ln_number) | |
1530 | return -1; | |
1531 | ||
1532 | return 0; | |
1533 | } | |
1534 | ||
1535 | /** | |
1536 | * gfs2_dispose_glock_lru - Demote a list of glocks | |
1537 | * @list: The list to dispose of | |
1538 | * | |
1539 | * Disposing of glocks may involve disk accesses, so that here we sort | |
1540 | * the glocks by number (i.e. disk location of the inodes) so that if | |
1541 | * there are any such accesses, they'll be sent in order (mostly). | |
1542 | * | |
1543 | * Must be called under the lru_lock, but may drop and retake this | |
1544 | * lock. While the lru_lock is dropped, entries may vanish from the | |
1545 | * list, but no new entries will appear on the list (since it is | |
1546 | * private) | |
1547 | */ | |
1548 | ||
1549 | static void gfs2_dispose_glock_lru(struct list_head *list) | |
1550 | __releases(&lru_lock) | |
1551 | __acquires(&lru_lock) | |
1552 | { | |
1553 | struct gfs2_glock *gl; | |
1554 | ||
1555 | list_sort(NULL, list, glock_cmp); | |
1556 | ||
1557 | while(!list_empty(list)) { | |
1558 | gl = list_entry(list->next, struct gfs2_glock, gl_lru); | |
1559 | list_del_init(&gl->gl_lru); | |
f3dd1649 | 1560 | if (!spin_trylock(&gl->gl_lockref.lock)) { |
94a09a39 | 1561 | add_back_to_lru: |
e66cf161 | 1562 | list_add(&gl->gl_lru, &lru_list); |
7881ef3f | 1563 | set_bit(GLF_LRU, &gl->gl_flags); |
e66cf161 SW |
1564 | atomic_inc(&lru_count); |
1565 | continue; | |
1566 | } | |
94a09a39 | 1567 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) { |
f3dd1649 | 1568 | spin_unlock(&gl->gl_lockref.lock); |
94a09a39 SW |
1569 | goto add_back_to_lru; |
1570 | } | |
e66cf161 | 1571 | gl->gl_lockref.count++; |
4506a519 | 1572 | if (demote_ok(gl)) |
81ffbf65 | 1573 | handle_callback(gl, LM_ST_UNLOCKED, 0, false); |
4506a519 | 1574 | WARN_ON(!test_and_clear_bit(GLF_LOCK, &gl->gl_flags)); |
6b0c7440 | 1575 | __gfs2_glock_queue_work(gl, 0); |
f3dd1649 | 1576 | spin_unlock(&gl->gl_lockref.lock); |
94a09a39 | 1577 | cond_resched_lock(&lru_lock); |
4506a519 SW |
1578 | } |
1579 | } | |
1580 | ||
2a005855 SW |
1581 | /** |
1582 | * gfs2_scan_glock_lru - Scan the LRU looking for locks to demote | |
1583 | * @nr: The number of entries to scan | |
1584 | * | |
4506a519 SW |
1585 | * This function selects the entries on the LRU which are able to |
1586 | * be demoted, and then kicks off the process by calling | |
1587 | * gfs2_dispose_glock_lru() above. | |
2a005855 | 1588 | */ |
b3b94faa | 1589 | |
1ab6c499 | 1590 | static long gfs2_scan_glock_lru(int nr) |
b3b94faa DT |
1591 | { |
1592 | struct gfs2_glock *gl; | |
97cc1025 | 1593 | LIST_HEAD(skipped); |
4506a519 | 1594 | LIST_HEAD(dispose); |
1ab6c499 | 1595 | long freed = 0; |
b3b94faa | 1596 | |
97cc1025 | 1597 | spin_lock(&lru_lock); |
1ab6c499 | 1598 | while ((nr-- >= 0) && !list_empty(&lru_list)) { |
97cc1025 | 1599 | gl = list_entry(lru_list.next, struct gfs2_glock, gl_lru); |
97cc1025 SW |
1600 | |
1601 | /* Test for being demotable */ | |
94a09a39 | 1602 | if (!test_bit(GLF_LOCK, &gl->gl_flags)) { |
4506a519 SW |
1603 | list_move(&gl->gl_lru, &dispose); |
1604 | atomic_dec(&lru_count); | |
7881ef3f | 1605 | clear_bit(GLF_LRU, &gl->gl_flags); |
1ab6c499 | 1606 | freed++; |
2163b1e6 | 1607 | continue; |
97cc1025 | 1608 | } |
4506a519 SW |
1609 | |
1610 | list_move(&gl->gl_lru, &skipped); | |
b3b94faa | 1611 | } |
97cc1025 | 1612 | list_splice(&skipped, &lru_list); |
4506a519 SW |
1613 | if (!list_empty(&dispose)) |
1614 | gfs2_dispose_glock_lru(&dispose); | |
97cc1025 | 1615 | spin_unlock(&lru_lock); |
1ab6c499 DC |
1616 | |
1617 | return freed; | |
2a005855 SW |
1618 | } |
1619 | ||
1ab6c499 DC |
1620 | static unsigned long gfs2_glock_shrink_scan(struct shrinker *shrink, |
1621 | struct shrink_control *sc) | |
2a005855 | 1622 | { |
1ab6c499 DC |
1623 | if (!(sc->gfp_mask & __GFP_FS)) |
1624 | return SHRINK_STOP; | |
1625 | return gfs2_scan_glock_lru(sc->nr_to_scan); | |
1626 | } | |
2a005855 | 1627 | |
1ab6c499 DC |
1628 | static unsigned long gfs2_glock_shrink_count(struct shrinker *shrink, |
1629 | struct shrink_control *sc) | |
1630 | { | |
55f841ce | 1631 | return vfs_pressure_ratio(atomic_read(&lru_count)); |
b3b94faa DT |
1632 | } |
1633 | ||
97cc1025 | 1634 | static struct shrinker glock_shrinker = { |
97cc1025 | 1635 | .seeks = DEFAULT_SEEKS, |
1ab6c499 DC |
1636 | .count_objects = gfs2_glock_shrink_count, |
1637 | .scan_objects = gfs2_glock_shrink_scan, | |
97cc1025 SW |
1638 | }; |
1639 | ||
b3b94faa DT |
1640 | /** |
1641 | * examine_bucket - Call a function for glock in a hash bucket | |
1642 | * @examiner: the function | |
1643 | * @sdp: the filesystem | |
1644 | * @bucket: the bucket | |
1645 | * | |
98687f42 HX |
1646 | * Note that the function can be called multiple times on the same |
1647 | * object. So the user must ensure that the function can cope with | |
1648 | * that. | |
b3b94faa DT |
1649 | */ |
1650 | ||
88ffbf3e | 1651 | static void glock_hash_walk(glock_examiner examiner, const struct gfs2_sbd *sdp) |
b3b94faa | 1652 | { |
bc015cb8 | 1653 | struct gfs2_glock *gl; |
98687f42 HX |
1654 | struct rhashtable_iter iter; |
1655 | ||
1656 | rhashtable_walk_enter(&gl_hash_table, &iter); | |
1657 | ||
1658 | do { | |
97a6ec4a | 1659 | rhashtable_walk_start(&iter); |
98687f42 HX |
1660 | |
1661 | while ((gl = rhashtable_walk_next(&iter)) && !IS_ERR(gl)) | |
27c3b415 | 1662 | if (gl->gl_name.ln_sbd == sdp && |
88ffbf3e BP |
1663 | lockref_get_not_dead(&gl->gl_lockref)) |
1664 | examiner(gl); | |
98687f42 HX |
1665 | |
1666 | rhashtable_walk_stop(&iter); | |
1667 | } while (cond_resched(), gl == ERR_PTR(-EAGAIN)); | |
1668 | ||
1669 | rhashtable_walk_exit(&iter); | |
bc015cb8 SW |
1670 | } |
1671 | ||
f057f6cd SW |
1672 | /** |
1673 | * thaw_glock - thaw out a glock which has an unprocessed reply waiting | |
1674 | * @gl: The glock to thaw | |
1675 | * | |
f057f6cd SW |
1676 | */ |
1677 | ||
1678 | static void thaw_glock(struct gfs2_glock *gl) | |
1679 | { | |
6b0c7440 | 1680 | if (!test_and_clear_bit(GLF_FROZEN, &gl->gl_flags)) { |
f057f6cd | 1681 | gfs2_glock_put(gl); |
6b0c7440 | 1682 | return; |
7286b31e | 1683 | } |
6b0c7440 AG |
1684 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
1685 | gfs2_glock_queue_work(gl, 0); | |
f057f6cd SW |
1686 | } |
1687 | ||
b3b94faa DT |
1688 | /** |
1689 | * clear_glock - look at a glock and see if we can free it from glock cache | |
1690 | * @gl: the glock to look at | |
1691 | * | |
1692 | */ | |
1693 | ||
1694 | static void clear_glock(struct gfs2_glock *gl) | |
1695 | { | |
f42ab085 | 1696 | gfs2_glock_remove_from_lru(gl); |
b3b94faa | 1697 | |
f3dd1649 | 1698 | spin_lock(&gl->gl_lockref.lock); |
c741c455 | 1699 | if (gl->gl_state != LM_ST_UNLOCKED) |
81ffbf65 | 1700 | handle_callback(gl, LM_ST_UNLOCKED, 0, false); |
6b0c7440 | 1701 | __gfs2_glock_queue_work(gl, 0); |
f3dd1649 | 1702 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa DT |
1703 | } |
1704 | ||
f057f6cd SW |
1705 | /** |
1706 | * gfs2_glock_thaw - Thaw any frozen glocks | |
1707 | * @sdp: The super block | |
1708 | * | |
1709 | */ | |
1710 | ||
1711 | void gfs2_glock_thaw(struct gfs2_sbd *sdp) | |
1712 | { | |
bc015cb8 SW |
1713 | glock_hash_walk(thaw_glock, sdp); |
1714 | } | |
f057f6cd | 1715 | |
3792ce97 | 1716 | static void dump_glock(struct seq_file *seq, struct gfs2_glock *gl, bool fsid) |
bc015cb8 | 1717 | { |
f3dd1649 | 1718 | spin_lock(&gl->gl_lockref.lock); |
3792ce97 | 1719 | gfs2_dump_glock(seq, gl, fsid); |
f3dd1649 | 1720 | spin_unlock(&gl->gl_lockref.lock); |
bc015cb8 SW |
1721 | } |
1722 | ||
1723 | static void dump_glock_func(struct gfs2_glock *gl) | |
1724 | { | |
3792ce97 | 1725 | dump_glock(NULL, gl, true); |
f057f6cd SW |
1726 | } |
1727 | ||
b3b94faa DT |
1728 | /** |
1729 | * gfs2_gl_hash_clear - Empty out the glock hash table | |
1730 | * @sdp: the filesystem | |
1731 | * @wait: wait until it's all gone | |
1732 | * | |
1bdad606 | 1733 | * Called when unmounting the filesystem. |
b3b94faa DT |
1734 | */ |
1735 | ||
fefc03bf | 1736 | void gfs2_gl_hash_clear(struct gfs2_sbd *sdp) |
b3b94faa | 1737 | { |
fb6791d1 | 1738 | set_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags); |
222cb538 | 1739 | flush_workqueue(glock_workqueue); |
bc015cb8 | 1740 | glock_hash_walk(clear_glock, sdp); |
8f05228e | 1741 | flush_workqueue(glock_workqueue); |
2aba1b5b BP |
1742 | wait_event_timeout(sdp->sd_glock_wait, |
1743 | atomic_read(&sdp->sd_glock_disposal) == 0, | |
1744 | HZ * 600); | |
bc015cb8 | 1745 | glock_hash_walk(dump_glock_func, sdp); |
b3b94faa DT |
1746 | } |
1747 | ||
813e0c46 SW |
1748 | void gfs2_glock_finish_truncate(struct gfs2_inode *ip) |
1749 | { | |
1750 | struct gfs2_glock *gl = ip->i_gl; | |
1751 | int ret; | |
1752 | ||
1753 | ret = gfs2_truncatei_resume(ip); | |
15562c43 | 1754 | gfs2_assert_withdraw(gl->gl_name.ln_sbd, ret == 0); |
813e0c46 | 1755 | |
f3dd1649 | 1756 | spin_lock(&gl->gl_lockref.lock); |
813e0c46 SW |
1757 | clear_bit(GLF_LOCK, &gl->gl_flags); |
1758 | run_queue(gl, 1); | |
f3dd1649 | 1759 | spin_unlock(&gl->gl_lockref.lock); |
813e0c46 SW |
1760 | } |
1761 | ||
6802e340 | 1762 | static const char *state2str(unsigned state) |
04b933f2 | 1763 | { |
6802e340 SW |
1764 | switch(state) { |
1765 | case LM_ST_UNLOCKED: | |
1766 | return "UN"; | |
1767 | case LM_ST_SHARED: | |
1768 | return "SH"; | |
1769 | case LM_ST_DEFERRED: | |
1770 | return "DF"; | |
1771 | case LM_ST_EXCLUSIVE: | |
1772 | return "EX"; | |
1773 | } | |
1774 | return "??"; | |
1775 | } | |
1776 | ||
b58bf407 | 1777 | static const char *hflags2str(char *buf, u16 flags, unsigned long iflags) |
6802e340 SW |
1778 | { |
1779 | char *p = buf; | |
1780 | if (flags & LM_FLAG_TRY) | |
1781 | *p++ = 't'; | |
1782 | if (flags & LM_FLAG_TRY_1CB) | |
1783 | *p++ = 'T'; | |
1784 | if (flags & LM_FLAG_NOEXP) | |
1785 | *p++ = 'e'; | |
1786 | if (flags & LM_FLAG_ANY) | |
f057f6cd | 1787 | *p++ = 'A'; |
6802e340 SW |
1788 | if (flags & LM_FLAG_PRIORITY) |
1789 | *p++ = 'p'; | |
1790 | if (flags & GL_ASYNC) | |
1791 | *p++ = 'a'; | |
1792 | if (flags & GL_EXACT) | |
1793 | *p++ = 'E'; | |
6802e340 SW |
1794 | if (flags & GL_NOCACHE) |
1795 | *p++ = 'c'; | |
1796 | if (test_bit(HIF_HOLDER, &iflags)) | |
1797 | *p++ = 'H'; | |
1798 | if (test_bit(HIF_WAIT, &iflags)) | |
1799 | *p++ = 'W'; | |
1800 | if (test_bit(HIF_FIRST, &iflags)) | |
1801 | *p++ = 'F'; | |
1802 | *p = 0; | |
1803 | return buf; | |
04b933f2 RP |
1804 | } |
1805 | ||
b3b94faa DT |
1806 | /** |
1807 | * dump_holder - print information about a glock holder | |
6802e340 | 1808 | * @seq: the seq_file struct |
b3b94faa | 1809 | * @gh: the glock holder |
3792ce97 | 1810 | * @fs_id_buf: pointer to file system id (if requested) |
b3b94faa | 1811 | * |
b3b94faa DT |
1812 | */ |
1813 | ||
3792ce97 BP |
1814 | static void dump_holder(struct seq_file *seq, const struct gfs2_holder *gh, |
1815 | const char *fs_id_buf) | |
b3b94faa | 1816 | { |
6802e340 | 1817 | struct task_struct *gh_owner = NULL; |
6802e340 | 1818 | char flags_buf[32]; |
b3b94faa | 1819 | |
0b3a2c99 | 1820 | rcu_read_lock(); |
6802e340 | 1821 | if (gh->gh_owner_pid) |
b1e058da | 1822 | gh_owner = pid_task(gh->gh_owner_pid, PIDTYPE_PID); |
3792ce97 BP |
1823 | gfs2_print_dbg(seq, "%s H: s:%s f:%s e:%d p:%ld [%s] %pS\n", |
1824 | fs_id_buf, state2str(gh->gh_state), | |
cc18152e JP |
1825 | hflags2str(flags_buf, gh->gh_flags, gh->gh_iflags), |
1826 | gh->gh_error, | |
1827 | gh->gh_owner_pid ? (long)pid_nr(gh->gh_owner_pid) : -1, | |
1828 | gh_owner ? gh_owner->comm : "(ended)", | |
1829 | (void *)gh->gh_ip); | |
0b3a2c99 | 1830 | rcu_read_unlock(); |
b3b94faa DT |
1831 | } |
1832 | ||
627c10b7 | 1833 | static const char *gflags2str(char *buf, const struct gfs2_glock *gl) |
6802e340 | 1834 | { |
627c10b7 | 1835 | const unsigned long *gflags = &gl->gl_flags; |
6802e340 | 1836 | char *p = buf; |
627c10b7 | 1837 | |
6802e340 SW |
1838 | if (test_bit(GLF_LOCK, gflags)) |
1839 | *p++ = 'l'; | |
6802e340 SW |
1840 | if (test_bit(GLF_DEMOTE, gflags)) |
1841 | *p++ = 'D'; | |
1842 | if (test_bit(GLF_PENDING_DEMOTE, gflags)) | |
1843 | *p++ = 'd'; | |
1844 | if (test_bit(GLF_DEMOTE_IN_PROGRESS, gflags)) | |
1845 | *p++ = 'p'; | |
1846 | if (test_bit(GLF_DIRTY, gflags)) | |
1847 | *p++ = 'y'; | |
1848 | if (test_bit(GLF_LFLUSH, gflags)) | |
1849 | *p++ = 'f'; | |
1850 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, gflags)) | |
1851 | *p++ = 'i'; | |
1852 | if (test_bit(GLF_REPLY_PENDING, gflags)) | |
1853 | *p++ = 'r'; | |
f057f6cd | 1854 | if (test_bit(GLF_INITIAL, gflags)) |
d8348de0 | 1855 | *p++ = 'I'; |
f057f6cd SW |
1856 | if (test_bit(GLF_FROZEN, gflags)) |
1857 | *p++ = 'F'; | |
7b5e3d5f SW |
1858 | if (test_bit(GLF_QUEUED, gflags)) |
1859 | *p++ = 'q'; | |
627c10b7 SW |
1860 | if (test_bit(GLF_LRU, gflags)) |
1861 | *p++ = 'L'; | |
1862 | if (gl->gl_object) | |
1863 | *p++ = 'o'; | |
a245769f SW |
1864 | if (test_bit(GLF_BLOCKING, gflags)) |
1865 | *p++ = 'b'; | |
6802e340 SW |
1866 | *p = 0; |
1867 | return buf; | |
b3b94faa DT |
1868 | } |
1869 | ||
1870 | /** | |
8eae1ca0 | 1871 | * gfs2_dump_glock - print information about a glock |
6802e340 | 1872 | * @seq: The seq_file struct |
b3b94faa | 1873 | * @gl: the glock |
3792ce97 | 1874 | * @fsid: If true, also dump the file system id |
6802e340 SW |
1875 | * |
1876 | * The file format is as follows: | |
1877 | * One line per object, capital letters are used to indicate objects | |
1878 | * G = glock, I = Inode, R = rgrp, H = holder. Glocks are not indented, | |
1879 | * other objects are indented by a single space and follow the glock to | |
1880 | * which they are related. Fields are indicated by lower case letters | |
1881 | * followed by a colon and the field value, except for strings which are in | |
1882 | * [] so that its possible to see if they are composed of spaces for | |
1883 | * example. The field's are n = number (id of the object), f = flags, | |
1884 | * t = type, s = state, r = refcount, e = error, p = pid. | |
b3b94faa | 1885 | * |
b3b94faa DT |
1886 | */ |
1887 | ||
3792ce97 | 1888 | void gfs2_dump_glock(struct seq_file *seq, struct gfs2_glock *gl, bool fsid) |
b3b94faa | 1889 | { |
6802e340 SW |
1890 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
1891 | unsigned long long dtime; | |
1892 | const struct gfs2_holder *gh; | |
1893 | char gflags_buf[32]; | |
3792ce97 | 1894 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
98fb0574 | 1895 | char fs_id_buf[sizeof(sdp->sd_fsname) + 7]; |
b3b94faa | 1896 | |
3792ce97 BP |
1897 | memset(fs_id_buf, 0, sizeof(fs_id_buf)); |
1898 | if (fsid && sdp) /* safety precaution */ | |
1899 | sprintf(fs_id_buf, "fsid=%s: ", sdp->sd_fsname); | |
6802e340 SW |
1900 | dtime = jiffies - gl->gl_demote_time; |
1901 | dtime *= 1000000/HZ; /* demote time in uSec */ | |
1902 | if (!test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
1903 | dtime = 0; | |
3792ce97 BP |
1904 | gfs2_print_dbg(seq, "%sG: s:%s n:%u/%llx f:%s t:%s d:%s/%llu a:%d " |
1905 | "v:%d r:%d m:%ld\n", fs_id_buf, state2str(gl->gl_state), | |
6802e340 SW |
1906 | gl->gl_name.ln_type, |
1907 | (unsigned long long)gl->gl_name.ln_number, | |
627c10b7 | 1908 | gflags2str(gflags_buf, gl), |
6802e340 SW |
1909 | state2str(gl->gl_target), |
1910 | state2str(gl->gl_demote_state), dtime, | |
6802e340 | 1911 | atomic_read(&gl->gl_ail_count), |
638803d4 | 1912 | atomic_read(&gl->gl_revokes), |
e66cf161 | 1913 | (int)gl->gl_lockref.count, gl->gl_hold_time); |
b3b94faa | 1914 | |
ac3beb6a | 1915 | list_for_each_entry(gh, &gl->gl_holders, gh_list) |
3792ce97 | 1916 | dump_holder(seq, gh, fs_id_buf); |
ac3beb6a | 1917 | |
6802e340 | 1918 | if (gl->gl_state != LM_ST_UNLOCKED && glops->go_dump) |
3792ce97 | 1919 | glops->go_dump(seq, gl, fs_id_buf); |
b3b94faa DT |
1920 | } |
1921 | ||
a245769f SW |
1922 | static int gfs2_glstats_seq_show(struct seq_file *seq, void *iter_ptr) |
1923 | { | |
1924 | struct gfs2_glock *gl = iter_ptr; | |
1925 | ||
4d207133 | 1926 | seq_printf(seq, "G: n:%u/%llx rtt:%llu/%llu rttb:%llu/%llu irt:%llu/%llu dcnt: %llu qcnt: %llu\n", |
a245769f SW |
1927 | gl->gl_name.ln_type, |
1928 | (unsigned long long)gl->gl_name.ln_number, | |
4d207133 BH |
1929 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTT], |
1930 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTVAR], | |
1931 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTB], | |
1932 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTVARB], | |
1933 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SIRT], | |
1934 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SIRTVAR], | |
1935 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_DCOUNT], | |
1936 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_QCOUNT]); | |
a245769f SW |
1937 | return 0; |
1938 | } | |
1939 | ||
1940 | static const char *gfs2_gltype[] = { | |
1941 | "type", | |
1942 | "reserved", | |
1943 | "nondisk", | |
1944 | "inode", | |
1945 | "rgrp", | |
1946 | "meta", | |
1947 | "iopen", | |
1948 | "flock", | |
1949 | "plock", | |
1950 | "quota", | |
1951 | "journal", | |
1952 | }; | |
1953 | ||
1954 | static const char *gfs2_stype[] = { | |
1955 | [GFS2_LKS_SRTT] = "srtt", | |
1956 | [GFS2_LKS_SRTTVAR] = "srttvar", | |
1957 | [GFS2_LKS_SRTTB] = "srttb", | |
1958 | [GFS2_LKS_SRTTVARB] = "srttvarb", | |
1959 | [GFS2_LKS_SIRT] = "sirt", | |
1960 | [GFS2_LKS_SIRTVAR] = "sirtvar", | |
1961 | [GFS2_LKS_DCOUNT] = "dlm", | |
1962 | [GFS2_LKS_QCOUNT] = "queue", | |
1963 | }; | |
1964 | ||
1965 | #define GFS2_NR_SBSTATS (ARRAY_SIZE(gfs2_gltype) * ARRAY_SIZE(gfs2_stype)) | |
1966 | ||
1967 | static int gfs2_sbstats_seq_show(struct seq_file *seq, void *iter_ptr) | |
1968 | { | |
81648d04 AG |
1969 | struct gfs2_sbd *sdp = seq->private; |
1970 | loff_t pos = *(loff_t *)iter_ptr; | |
1971 | unsigned index = pos >> 3; | |
1972 | unsigned subindex = pos & 0x07; | |
a245769f SW |
1973 | int i; |
1974 | ||
1975 | if (index == 0 && subindex != 0) | |
1976 | return 0; | |
6802e340 | 1977 | |
a245769f SW |
1978 | seq_printf(seq, "%-10s %8s:", gfs2_gltype[index], |
1979 | (index == 0) ? "cpu": gfs2_stype[subindex]); | |
b3b94faa | 1980 | |
a245769f SW |
1981 | for_each_possible_cpu(i) { |
1982 | const struct gfs2_pcpu_lkstats *lkstats = per_cpu_ptr(sdp->sd_lkstats, i); | |
8f7e0a80 AG |
1983 | |
1984 | if (index == 0) | |
1985 | seq_printf(seq, " %15u", i); | |
1986 | else | |
1987 | seq_printf(seq, " %15llu", (unsigned long long)lkstats-> | |
1988 | lkstats[index - 1].stats[subindex]); | |
a245769f SW |
1989 | } |
1990 | seq_putc(seq, '\n'); | |
1991 | return 0; | |
1992 | } | |
8fbbfd21 | 1993 | |
85d1da67 SW |
1994 | int __init gfs2_glock_init(void) |
1995 | { | |
0515480a | 1996 | int i, ret; |
88ffbf3e BP |
1997 | |
1998 | ret = rhashtable_init(&gl_hash_table, &ht_parms); | |
1999 | if (ret < 0) | |
2000 | return ret; | |
8fbbfd21 | 2001 | |
d2115778 | 2002 | glock_workqueue = alloc_workqueue("glock_workqueue", WQ_MEM_RECLAIM | |
58a69cb4 | 2003 | WQ_HIGHPRI | WQ_FREEZABLE, 0); |
88ffbf3e BP |
2004 | if (!glock_workqueue) { |
2005 | rhashtable_destroy(&gl_hash_table); | |
dfc4616d | 2006 | return -ENOMEM; |
88ffbf3e | 2007 | } |
d2115778 | 2008 | gfs2_delete_workqueue = alloc_workqueue("delete_workqueue", |
58a69cb4 | 2009 | WQ_MEM_RECLAIM | WQ_FREEZABLE, |
d2115778 | 2010 | 0); |
dfc4616d | 2011 | if (!gfs2_delete_workqueue) { |
b94a170e | 2012 | destroy_workqueue(glock_workqueue); |
88ffbf3e | 2013 | rhashtable_destroy(&gl_hash_table); |
dfc4616d | 2014 | return -ENOMEM; |
b94a170e | 2015 | } |
97cc1025 | 2016 | |
e0d735c1 CY |
2017 | ret = register_shrinker(&glock_shrinker); |
2018 | if (ret) { | |
2019 | destroy_workqueue(gfs2_delete_workqueue); | |
2020 | destroy_workqueue(glock_workqueue); | |
2021 | rhashtable_destroy(&gl_hash_table); | |
2022 | return ret; | |
2023 | } | |
c4f68a13 | 2024 | |
0515480a AG |
2025 | for (i = 0; i < GLOCK_WAIT_TABLE_SIZE; i++) |
2026 | init_waitqueue_head(glock_wait_table + i); | |
2027 | ||
85d1da67 SW |
2028 | return 0; |
2029 | } | |
2030 | ||
8fbbfd21 SW |
2031 | void gfs2_glock_exit(void) |
2032 | { | |
97cc1025 | 2033 | unregister_shrinker(&glock_shrinker); |
88ffbf3e | 2034 | rhashtable_destroy(&gl_hash_table); |
c4f68a13 | 2035 | destroy_workqueue(glock_workqueue); |
b94a170e | 2036 | destroy_workqueue(gfs2_delete_workqueue); |
8fbbfd21 SW |
2037 | } |
2038 | ||
7ac07fda | 2039 | static void gfs2_glock_iter_next(struct gfs2_glock_iter *gi, loff_t n) |
bc015cb8 | 2040 | { |
3fd5d3ad AG |
2041 | struct gfs2_glock *gl = gi->gl; |
2042 | ||
2043 | if (gl) { | |
2044 | if (n == 0) | |
2045 | return; | |
2046 | if (!lockref_put_not_zero(&gl->gl_lockref)) | |
2047 | gfs2_glock_queue_put(gl); | |
7ac07fda AG |
2048 | } |
2049 | for (;;) { | |
3fd5d3ad AG |
2050 | gl = rhashtable_walk_next(&gi->hti); |
2051 | if (IS_ERR_OR_NULL(gl)) { | |
2052 | if (gl == ERR_PTR(-EAGAIN)) { | |
2053 | n = 1; | |
2054 | continue; | |
7ac07fda | 2055 | } |
3fd5d3ad AG |
2056 | gl = NULL; |
2057 | break; | |
2058 | } | |
2059 | if (gl->gl_name.ln_sbd != gi->sdp) | |
2060 | continue; | |
2061 | if (n <= 1) { | |
2062 | if (!lockref_get_not_dead(&gl->gl_lockref)) | |
2063 | continue; | |
2064 | break; | |
2065 | } else { | |
2066 | if (__lockref_is_dead(&gl->gl_lockref)) | |
2067 | continue; | |
2068 | n--; | |
bc015cb8 | 2069 | } |
14d37564 | 2070 | } |
3fd5d3ad | 2071 | gi->gl = gl; |
7c52b166 RP |
2072 | } |
2073 | ||
6802e340 | 2074 | static void *gfs2_glock_seq_start(struct seq_file *seq, loff_t *pos) |
27c3b415 | 2075 | __acquires(RCU) |
7c52b166 | 2076 | { |
6802e340 | 2077 | struct gfs2_glock_iter *gi = seq->private; |
7ac07fda | 2078 | loff_t n; |
ba1ddcb6 | 2079 | |
7ac07fda AG |
2080 | /* |
2081 | * We can either stay where we are, skip to the next hash table | |
2082 | * entry, or start from the beginning. | |
2083 | */ | |
2084 | if (*pos < gi->last_pos) { | |
2085 | rhashtable_walk_exit(&gi->hti); | |
2086 | rhashtable_walk_enter(&gl_hash_table, &gi->hti); | |
2087 | n = *pos + 1; | |
2088 | } else { | |
2089 | n = *pos - gi->last_pos; | |
2090 | } | |
7c52b166 | 2091 | |
7ac07fda | 2092 | rhashtable_walk_start(&gi->hti); |
7c52b166 | 2093 | |
7ac07fda | 2094 | gfs2_glock_iter_next(gi, n); |
ba1ddcb6 | 2095 | gi->last_pos = *pos; |
6802e340 | 2096 | return gi->gl; |
7c52b166 RP |
2097 | } |
2098 | ||
6802e340 | 2099 | static void *gfs2_glock_seq_next(struct seq_file *seq, void *iter_ptr, |
7c52b166 RP |
2100 | loff_t *pos) |
2101 | { | |
6802e340 | 2102 | struct gfs2_glock_iter *gi = seq->private; |
7c52b166 RP |
2103 | |
2104 | (*pos)++; | |
ba1ddcb6 | 2105 | gi->last_pos = *pos; |
7ac07fda | 2106 | gfs2_glock_iter_next(gi, 1); |
6802e340 | 2107 | return gi->gl; |
7c52b166 RP |
2108 | } |
2109 | ||
6802e340 | 2110 | static void gfs2_glock_seq_stop(struct seq_file *seq, void *iter_ptr) |
27c3b415 | 2111 | __releases(RCU) |
7c52b166 | 2112 | { |
6802e340 | 2113 | struct gfs2_glock_iter *gi = seq->private; |
bc015cb8 | 2114 | |
88ffbf3e | 2115 | rhashtable_walk_stop(&gi->hti); |
7c52b166 RP |
2116 | } |
2117 | ||
6802e340 | 2118 | static int gfs2_glock_seq_show(struct seq_file *seq, void *iter_ptr) |
7c52b166 | 2119 | { |
3792ce97 | 2120 | dump_glock(seq, iter_ptr, false); |
ac3beb6a | 2121 | return 0; |
7c52b166 RP |
2122 | } |
2123 | ||
a245769f SW |
2124 | static void *gfs2_sbstats_seq_start(struct seq_file *seq, loff_t *pos) |
2125 | { | |
81648d04 | 2126 | preempt_disable(); |
a245769f SW |
2127 | if (*pos >= GFS2_NR_SBSTATS) |
2128 | return NULL; | |
81648d04 | 2129 | return pos; |
a245769f SW |
2130 | } |
2131 | ||
2132 | static void *gfs2_sbstats_seq_next(struct seq_file *seq, void *iter_ptr, | |
2133 | loff_t *pos) | |
2134 | { | |
a245769f | 2135 | (*pos)++; |
81648d04 | 2136 | if (*pos >= GFS2_NR_SBSTATS) |
a245769f | 2137 | return NULL; |
81648d04 | 2138 | return pos; |
a245769f SW |
2139 | } |
2140 | ||
2141 | static void gfs2_sbstats_seq_stop(struct seq_file *seq, void *iter_ptr) | |
2142 | { | |
2143 | preempt_enable(); | |
2144 | } | |
2145 | ||
4ef29002 | 2146 | static const struct seq_operations gfs2_glock_seq_ops = { |
7c52b166 RP |
2147 | .start = gfs2_glock_seq_start, |
2148 | .next = gfs2_glock_seq_next, | |
2149 | .stop = gfs2_glock_seq_stop, | |
2150 | .show = gfs2_glock_seq_show, | |
2151 | }; | |
2152 | ||
a245769f SW |
2153 | static const struct seq_operations gfs2_glstats_seq_ops = { |
2154 | .start = gfs2_glock_seq_start, | |
2155 | .next = gfs2_glock_seq_next, | |
2156 | .stop = gfs2_glock_seq_stop, | |
2157 | .show = gfs2_glstats_seq_show, | |
2158 | }; | |
2159 | ||
2160 | static const struct seq_operations gfs2_sbstats_seq_ops = { | |
2161 | .start = gfs2_sbstats_seq_start, | |
2162 | .next = gfs2_sbstats_seq_next, | |
2163 | .stop = gfs2_sbstats_seq_stop, | |
2164 | .show = gfs2_sbstats_seq_show, | |
2165 | }; | |
2166 | ||
0fe2f1e9 SW |
2167 | #define GFS2_SEQ_GOODSIZE min(PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER, 65536UL) |
2168 | ||
92ecd73a AG |
2169 | static int __gfs2_glocks_open(struct inode *inode, struct file *file, |
2170 | const struct seq_operations *ops) | |
7c52b166 | 2171 | { |
92ecd73a | 2172 | int ret = seq_open_private(file, ops, sizeof(struct gfs2_glock_iter)); |
6802e340 SW |
2173 | if (ret == 0) { |
2174 | struct seq_file *seq = file->private_data; | |
2175 | struct gfs2_glock_iter *gi = seq->private; | |
88ffbf3e | 2176 | |
6802e340 | 2177 | gi->sdp = inode->i_private; |
0fe2f1e9 | 2178 | seq->buf = kmalloc(GFS2_SEQ_GOODSIZE, GFP_KERNEL | __GFP_NOWARN); |
df5d2f55 | 2179 | if (seq->buf) |
0fe2f1e9 | 2180 | seq->size = GFS2_SEQ_GOODSIZE; |
7ac07fda AG |
2181 | /* |
2182 | * Initially, we are "before" the first hash table entry; the | |
2183 | * first call to rhashtable_walk_next gets us the first entry. | |
2184 | */ | |
2185 | gi->last_pos = -1; | |
88ffbf3e | 2186 | gi->gl = NULL; |
7ac07fda | 2187 | rhashtable_walk_enter(&gl_hash_table, &gi->hti); |
6802e340 SW |
2188 | } |
2189 | return ret; | |
7c52b166 RP |
2190 | } |
2191 | ||
92ecd73a AG |
2192 | static int gfs2_glocks_open(struct inode *inode, struct file *file) |
2193 | { | |
2194 | return __gfs2_glocks_open(inode, file, &gfs2_glock_seq_ops); | |
2195 | } | |
2196 | ||
88ffbf3e BP |
2197 | static int gfs2_glocks_release(struct inode *inode, struct file *file) |
2198 | { | |
2199 | struct seq_file *seq = file->private_data; | |
2200 | struct gfs2_glock_iter *gi = seq->private; | |
2201 | ||
3fd5d3ad AG |
2202 | if (gi->gl) |
2203 | gfs2_glock_put(gi->gl); | |
7ac07fda | 2204 | rhashtable_walk_exit(&gi->hti); |
88ffbf3e BP |
2205 | return seq_release_private(inode, file); |
2206 | } | |
2207 | ||
a245769f SW |
2208 | static int gfs2_glstats_open(struct inode *inode, struct file *file) |
2209 | { | |
92ecd73a | 2210 | return __gfs2_glocks_open(inode, file, &gfs2_glstats_seq_ops); |
a245769f SW |
2211 | } |
2212 | ||
2213 | static int gfs2_sbstats_open(struct inode *inode, struct file *file) | |
2214 | { | |
81648d04 | 2215 | int ret = seq_open(file, &gfs2_sbstats_seq_ops); |
a245769f SW |
2216 | if (ret == 0) { |
2217 | struct seq_file *seq = file->private_data; | |
81648d04 | 2218 | seq->private = inode->i_private; /* sdp */ |
a245769f SW |
2219 | } |
2220 | return ret; | |
2221 | } | |
2222 | ||
2223 | static const struct file_operations gfs2_glocks_fops = { | |
2224 | .owner = THIS_MODULE, | |
2225 | .open = gfs2_glocks_open, | |
2226 | .read = seq_read, | |
2227 | .llseek = seq_lseek, | |
88ffbf3e | 2228 | .release = gfs2_glocks_release, |
a245769f SW |
2229 | }; |
2230 | ||
2231 | static const struct file_operations gfs2_glstats_fops = { | |
7c52b166 | 2232 | .owner = THIS_MODULE, |
a245769f SW |
2233 | .open = gfs2_glstats_open, |
2234 | .read = seq_read, | |
2235 | .llseek = seq_lseek, | |
88ffbf3e | 2236 | .release = gfs2_glocks_release, |
a245769f SW |
2237 | }; |
2238 | ||
2239 | static const struct file_operations gfs2_sbstats_fops = { | |
2240 | .owner = THIS_MODULE, | |
2241 | .open = gfs2_sbstats_open, | |
7c52b166 RP |
2242 | .read = seq_read, |
2243 | .llseek = seq_lseek, | |
81648d04 | 2244 | .release = seq_release, |
7c52b166 RP |
2245 | }; |
2246 | ||
2abbf9a4 GKH |
2247 | void gfs2_create_debugfs_file(struct gfs2_sbd *sdp) |
2248 | { | |
2249 | sdp->debugfs_dir = debugfs_create_dir(sdp->sd_table_name, gfs2_root); | |
7c52b166 | 2250 | |
2abbf9a4 GKH |
2251 | debugfs_create_file("glocks", S_IFREG | S_IRUGO, sdp->debugfs_dir, sdp, |
2252 | &gfs2_glocks_fops); | |
2253 | ||
2254 | debugfs_create_file("glstats", S_IFREG | S_IRUGO, sdp->debugfs_dir, sdp, | |
2255 | &gfs2_glstats_fops); | |
2256 | ||
2257 | debugfs_create_file("sbstats", S_IFREG | S_IRUGO, sdp->debugfs_dir, sdp, | |
2258 | &gfs2_sbstats_fops); | |
7c52b166 RP |
2259 | } |
2260 | ||
2261 | void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp) | |
2262 | { | |
2abbf9a4 GKH |
2263 | debugfs_remove_recursive(sdp->debugfs_dir); |
2264 | sdp->debugfs_dir = NULL; | |
7c52b166 RP |
2265 | } |
2266 | ||
2abbf9a4 | 2267 | void gfs2_register_debugfs(void) |
7c52b166 RP |
2268 | { |
2269 | gfs2_root = debugfs_create_dir("gfs2", NULL); | |
7c52b166 RP |
2270 | } |
2271 | ||
2272 | void gfs2_unregister_debugfs(void) | |
2273 | { | |
2274 | debugfs_remove(gfs2_root); | |
5f882096 | 2275 | gfs2_root = NULL; |
7c52b166 | 2276 | } |