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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 | ||
a72d2401 BP |
136 | /** |
137 | * glock_blocked_by_withdraw - determine if we can still use a glock | |
138 | * @gl: the glock | |
139 | * | |
140 | * We need to allow some glocks to be enqueued, dequeued, promoted, and demoted | |
141 | * when we're withdrawn. For example, to maintain metadata integrity, we should | |
142 | * disallow the use of inode and rgrp glocks when withdrawn. Other glocks, like | |
143 | * iopen or the transaction glocks may be safely used because none of their | |
144 | * metadata goes through the journal. So in general, we should disallow all | |
145 | * glocks that are journaled, and allow all the others. One exception is: | |
146 | * we need to allow our active journal to be promoted and demoted so others | |
147 | * may recover it and we can reacquire it when they're done. | |
148 | */ | |
149 | static bool glock_blocked_by_withdraw(struct gfs2_glock *gl) | |
150 | { | |
151 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; | |
152 | ||
153 | if (likely(!gfs2_withdrawn(sdp))) | |
154 | return false; | |
155 | if (gl->gl_ops->go_flags & GLOF_NONDISK) | |
156 | return false; | |
157 | if (!sdp->sd_jdesc || | |
158 | gl->gl_name.ln_number == sdp->sd_jdesc->jd_no_addr) | |
159 | return false; | |
160 | return true; | |
161 | } | |
162 | ||
961ae1d8 AG |
163 | void gfs2_glock_free(struct gfs2_glock *gl) |
164 | { | |
165 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; | |
166 | ||
638803d4 | 167 | BUG_ON(atomic_read(&gl->gl_revokes)); |
0515480a AG |
168 | rhashtable_remove_fast(&gl_hash_table, &gl->gl_node, ht_parms); |
169 | smp_mb(); | |
170 | wake_up_glock(gl); | |
961ae1d8 | 171 | call_rcu(&gl->gl_rcu, gfs2_glock_dealloc); |
bc015cb8 SW |
172 | if (atomic_dec_and_test(&sdp->sd_glock_disposal)) |
173 | wake_up(&sdp->sd_glock_wait); | |
b3b94faa DT |
174 | } |
175 | ||
176 | /** | |
177 | * gfs2_glock_hold() - increment reference count on glock | |
178 | * @gl: The glock to hold | |
179 | * | |
180 | */ | |
181 | ||
71c1b213 | 182 | void gfs2_glock_hold(struct gfs2_glock *gl) |
b3b94faa | 183 | { |
e66cf161 SW |
184 | GLOCK_BUG_ON(gl, __lockref_is_dead(&gl->gl_lockref)); |
185 | lockref_get(&gl->gl_lockref); | |
b3b94faa DT |
186 | } |
187 | ||
8ff22a6f BM |
188 | /** |
189 | * demote_ok - Check to see if it's ok to unlock a glock | |
190 | * @gl: the glock | |
191 | * | |
192 | * Returns: 1 if it's ok | |
193 | */ | |
194 | ||
195 | static int demote_ok(const struct gfs2_glock *gl) | |
196 | { | |
197 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
198 | ||
199 | if (gl->gl_state == LM_ST_UNLOCKED) | |
200 | return 0; | |
f42ab085 | 201 | if (!list_empty(&gl->gl_holders)) |
8ff22a6f BM |
202 | return 0; |
203 | if (glops->go_demote_ok) | |
204 | return glops->go_demote_ok(gl); | |
205 | return 1; | |
206 | } | |
207 | ||
bc015cb8 | 208 | |
29687a2a SW |
209 | void gfs2_glock_add_to_lru(struct gfs2_glock *gl) |
210 | { | |
7881ef3f RL |
211 | if (!(gl->gl_ops->go_flags & GLOF_LRU)) |
212 | return; | |
213 | ||
29687a2a SW |
214 | spin_lock(&lru_lock); |
215 | ||
7881ef3f RL |
216 | list_del(&gl->gl_lru); |
217 | list_add_tail(&gl->gl_lru, &lru_list); | |
218 | ||
219 | if (!test_bit(GLF_LRU, &gl->gl_flags)) { | |
220 | set_bit(GLF_LRU, &gl->gl_flags); | |
29687a2a | 221 | atomic_inc(&lru_count); |
7881ef3f | 222 | } |
29687a2a | 223 | |
29687a2a SW |
224 | spin_unlock(&lru_lock); |
225 | } | |
226 | ||
8f6cb409 | 227 | static void gfs2_glock_remove_from_lru(struct gfs2_glock *gl) |
f42ab085 | 228 | { |
645ebd49 BP |
229 | if (!(gl->gl_ops->go_flags & GLOF_LRU)) |
230 | return; | |
231 | ||
8f6cb409 | 232 | spin_lock(&lru_lock); |
7881ef3f | 233 | if (test_bit(GLF_LRU, &gl->gl_flags)) { |
f42ab085 SW |
234 | list_del_init(&gl->gl_lru); |
235 | atomic_dec(&lru_count); | |
236 | clear_bit(GLF_LRU, &gl->gl_flags); | |
237 | } | |
238 | spin_unlock(&lru_lock); | |
239 | } | |
240 | ||
6b0c7440 AG |
241 | /* |
242 | * Enqueue the glock on the work queue. Passes one glock reference on to the | |
243 | * work queue. | |
b3b94faa | 244 | */ |
6b0c7440 AG |
245 | static void __gfs2_glock_queue_work(struct gfs2_glock *gl, unsigned long delay) { |
246 | if (!queue_delayed_work(glock_workqueue, &gl->gl_work, delay)) { | |
247 | /* | |
248 | * We are holding the lockref spinlock, and the work was still | |
249 | * queued above. The queued work (glock_work_func) takes that | |
250 | * spinlock before dropping its glock reference(s), so it | |
251 | * cannot have dropped them in the meantime. | |
252 | */ | |
253 | GLOCK_BUG_ON(gl, gl->gl_lockref.count < 2); | |
254 | gl->gl_lockref.count--; | |
255 | } | |
256 | } | |
b3b94faa | 257 | |
6b0c7440 AG |
258 | static void gfs2_glock_queue_work(struct gfs2_glock *gl, unsigned long delay) { |
259 | spin_lock(&gl->gl_lockref.lock); | |
260 | __gfs2_glock_queue_work(gl, delay); | |
261 | spin_unlock(&gl->gl_lockref.lock); | |
262 | } | |
263 | ||
264 | static void __gfs2_glock_put(struct gfs2_glock *gl) | |
b3b94faa | 265 | { |
15562c43 | 266 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
bc015cb8 | 267 | struct address_space *mapping = gfs2_glock2aspace(gl); |
b3b94faa | 268 | |
e66cf161 SW |
269 | lockref_mark_dead(&gl->gl_lockref); |
270 | ||
8f6cb409 | 271 | gfs2_glock_remove_from_lru(gl); |
e66cf161 | 272 | spin_unlock(&gl->gl_lockref.lock); |
e66cf161 | 273 | GLOCK_BUG_ON(gl, !list_empty(&gl->gl_holders)); |
601ef0d5 | 274 | GLOCK_BUG_ON(gl, mapping && mapping->nrpages && !gfs2_withdrawn(sdp)); |
e66cf161 SW |
275 | trace_gfs2_glock_put(gl); |
276 | sdp->sd_lockstruct.ls_ops->lm_put_lock(gl); | |
b3b94faa DT |
277 | } |
278 | ||
71c1b213 AG |
279 | /* |
280 | * Cause the glock to be put in work queue context. | |
281 | */ | |
282 | void gfs2_glock_queue_put(struct gfs2_glock *gl) | |
283 | { | |
284 | gfs2_glock_queue_work(gl, 0); | |
285 | } | |
286 | ||
6b0c7440 AG |
287 | /** |
288 | * gfs2_glock_put() - Decrement reference count on glock | |
289 | * @gl: The glock to put | |
290 | * | |
291 | */ | |
292 | ||
293 | void gfs2_glock_put(struct gfs2_glock *gl) | |
294 | { | |
295 | if (lockref_put_or_lock(&gl->gl_lockref)) | |
296 | return; | |
297 | ||
298 | __gfs2_glock_put(gl); | |
299 | } | |
300 | ||
6802e340 SW |
301 | /** |
302 | * may_grant - check if its ok to grant a new lock | |
303 | * @gl: The glock | |
304 | * @gh: The lock request which we wish to grant | |
305 | * | |
306 | * Returns: true if its ok to grant the lock | |
307 | */ | |
308 | ||
309 | static inline int may_grant(const struct gfs2_glock *gl, const struct gfs2_holder *gh) | |
310 | { | |
311 | const struct gfs2_holder *gh_head = list_entry(gl->gl_holders.next, const struct gfs2_holder, gh_list); | |
312 | if ((gh->gh_state == LM_ST_EXCLUSIVE || | |
313 | gh_head->gh_state == LM_ST_EXCLUSIVE) && gh != gh_head) | |
314 | return 0; | |
315 | if (gl->gl_state == gh->gh_state) | |
316 | return 1; | |
317 | if (gh->gh_flags & GL_EXACT) | |
318 | return 0; | |
209806ab SW |
319 | if (gl->gl_state == LM_ST_EXCLUSIVE) { |
320 | if (gh->gh_state == LM_ST_SHARED && gh_head->gh_state == LM_ST_SHARED) | |
321 | return 1; | |
322 | if (gh->gh_state == LM_ST_DEFERRED && gh_head->gh_state == LM_ST_DEFERRED) | |
323 | return 1; | |
324 | } | |
6802e340 SW |
325 | if (gl->gl_state != LM_ST_UNLOCKED && (gh->gh_flags & LM_FLAG_ANY)) |
326 | return 1; | |
327 | return 0; | |
328 | } | |
329 | ||
330 | static void gfs2_holder_wake(struct gfs2_holder *gh) | |
331 | { | |
332 | clear_bit(HIF_WAIT, &gh->gh_iflags); | |
4e857c58 | 333 | smp_mb__after_atomic(); |
6802e340 | 334 | wake_up_bit(&gh->gh_iflags, HIF_WAIT); |
ad26967b BP |
335 | if (gh->gh_flags & GL_ASYNC) { |
336 | struct gfs2_sbd *sdp = gh->gh_gl->gl_name.ln_sbd; | |
337 | ||
338 | wake_up(&sdp->sd_async_glock_wait); | |
339 | } | |
6802e340 SW |
340 | } |
341 | ||
d5341a92 SW |
342 | /** |
343 | * do_error - Something unexpected has happened during a lock request | |
344 | * | |
345 | */ | |
346 | ||
a527b38e | 347 | static void do_error(struct gfs2_glock *gl, const int ret) |
d5341a92 SW |
348 | { |
349 | struct gfs2_holder *gh, *tmp; | |
350 | ||
351 | list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) { | |
352 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
353 | continue; | |
354 | if (ret & LM_OUT_ERROR) | |
355 | gh->gh_error = -EIO; | |
356 | else if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) | |
357 | gh->gh_error = GLR_TRYFAILED; | |
358 | else | |
359 | continue; | |
360 | list_del_init(&gh->gh_list); | |
361 | trace_gfs2_glock_queue(gh, 0); | |
362 | gfs2_holder_wake(gh); | |
363 | } | |
364 | } | |
365 | ||
6802e340 SW |
366 | /** |
367 | * do_promote - promote as many requests as possible on the current queue | |
368 | * @gl: The glock | |
369 | * | |
813e0c46 SW |
370 | * Returns: 1 if there is a blocked holder at the head of the list, or 2 |
371 | * if a type specific operation is underway. | |
6802e340 SW |
372 | */ |
373 | ||
374 | static int do_promote(struct gfs2_glock *gl) | |
f3dd1649 AG |
375 | __releases(&gl->gl_lockref.lock) |
376 | __acquires(&gl->gl_lockref.lock) | |
6802e340 SW |
377 | { |
378 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
379 | struct gfs2_holder *gh, *tmp; | |
380 | int ret; | |
381 | ||
382 | restart: | |
383 | list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) { | |
384 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
385 | continue; | |
386 | if (may_grant(gl, gh)) { | |
387 | if (gh->gh_list.prev == &gl->gl_holders && | |
388 | glops->go_lock) { | |
f3dd1649 | 389 | spin_unlock(&gl->gl_lockref.lock); |
6802e340 SW |
390 | /* FIXME: eliminate this eventually */ |
391 | ret = glops->go_lock(gh); | |
f3dd1649 | 392 | spin_lock(&gl->gl_lockref.lock); |
6802e340 | 393 | if (ret) { |
813e0c46 SW |
394 | if (ret == 1) |
395 | return 2; | |
6802e340 SW |
396 | gh->gh_error = ret; |
397 | list_del_init(&gh->gh_list); | |
63997775 | 398 | trace_gfs2_glock_queue(gh, 0); |
6802e340 SW |
399 | gfs2_holder_wake(gh); |
400 | goto restart; | |
401 | } | |
402 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
63997775 | 403 | trace_gfs2_promote(gh, 1); |
6802e340 SW |
404 | gfs2_holder_wake(gh); |
405 | goto restart; | |
406 | } | |
407 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
63997775 | 408 | trace_gfs2_promote(gh, 0); |
6802e340 SW |
409 | gfs2_holder_wake(gh); |
410 | continue; | |
411 | } | |
412 | if (gh->gh_list.prev == &gl->gl_holders) | |
413 | return 1; | |
d5341a92 | 414 | do_error(gl, 0); |
6802e340 SW |
415 | break; |
416 | } | |
417 | return 0; | |
418 | } | |
419 | ||
6802e340 SW |
420 | /** |
421 | * find_first_waiter - find the first gh that's waiting for the glock | |
422 | * @gl: the glock | |
423 | */ | |
424 | ||
425 | static inline struct gfs2_holder *find_first_waiter(const struct gfs2_glock *gl) | |
426 | { | |
427 | struct gfs2_holder *gh; | |
428 | ||
429 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
430 | if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
431 | return gh; | |
432 | } | |
433 | return NULL; | |
434 | } | |
435 | ||
436 | /** | |
437 | * state_change - record that the glock is now in a different state | |
438 | * @gl: the glock | |
439 | * @new_state the new state | |
440 | * | |
441 | */ | |
442 | ||
443 | static void state_change(struct gfs2_glock *gl, unsigned int new_state) | |
444 | { | |
445 | int held1, held2; | |
446 | ||
447 | held1 = (gl->gl_state != LM_ST_UNLOCKED); | |
448 | held2 = (new_state != LM_ST_UNLOCKED); | |
449 | ||
450 | if (held1 != held2) { | |
e66cf161 | 451 | GLOCK_BUG_ON(gl, __lockref_is_dead(&gl->gl_lockref)); |
6802e340 | 452 | if (held2) |
e66cf161 | 453 | gl->gl_lockref.count++; |
6802e340 | 454 | else |
e66cf161 | 455 | gl->gl_lockref.count--; |
6802e340 | 456 | } |
7b5e3d5f SW |
457 | if (held1 && held2 && list_empty(&gl->gl_holders)) |
458 | clear_bit(GLF_QUEUED, &gl->gl_flags); | |
6802e340 | 459 | |
7cf8dcd3 BP |
460 | if (new_state != gl->gl_target) |
461 | /* shorten our minimum hold time */ | |
462 | gl->gl_hold_time = max(gl->gl_hold_time - GL_GLOCK_HOLD_DECR, | |
463 | GL_GLOCK_MIN_HOLD); | |
6802e340 SW |
464 | gl->gl_state = new_state; |
465 | gl->gl_tchange = jiffies; | |
466 | } | |
467 | ||
468 | static void gfs2_demote_wake(struct gfs2_glock *gl) | |
469 | { | |
470 | gl->gl_demote_state = LM_ST_EXCLUSIVE; | |
471 | clear_bit(GLF_DEMOTE, &gl->gl_flags); | |
4e857c58 | 472 | smp_mb__after_atomic(); |
6802e340 SW |
473 | wake_up_bit(&gl->gl_flags, GLF_DEMOTE); |
474 | } | |
475 | ||
476 | /** | |
477 | * finish_xmote - The DLM has replied to one of our lock requests | |
478 | * @gl: The glock | |
479 | * @ret: The status from the DLM | |
480 | * | |
481 | */ | |
482 | ||
483 | static void finish_xmote(struct gfs2_glock *gl, unsigned int ret) | |
484 | { | |
485 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
486 | struct gfs2_holder *gh; | |
487 | unsigned state = ret & LM_OUT_ST_MASK; | |
813e0c46 | 488 | int rv; |
6802e340 | 489 | |
f3dd1649 | 490 | spin_lock(&gl->gl_lockref.lock); |
63997775 | 491 | trace_gfs2_glock_state_change(gl, state); |
6802e340 SW |
492 | state_change(gl, state); |
493 | gh = find_first_waiter(gl); | |
494 | ||
495 | /* Demote to UN request arrived during demote to SH or DF */ | |
496 | if (test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags) && | |
497 | state != LM_ST_UNLOCKED && gl->gl_demote_state == LM_ST_UNLOCKED) | |
498 | gl->gl_target = LM_ST_UNLOCKED; | |
499 | ||
500 | /* Check for state != intended state */ | |
501 | if (unlikely(state != gl->gl_target)) { | |
502 | if (gh && !test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)) { | |
503 | /* move to back of queue and try next entry */ | |
504 | if (ret & LM_OUT_CANCELED) { | |
505 | if ((gh->gh_flags & LM_FLAG_PRIORITY) == 0) | |
506 | list_move_tail(&gh->gh_list, &gl->gl_holders); | |
507 | gh = find_first_waiter(gl); | |
508 | gl->gl_target = gh->gh_state; | |
509 | goto retry; | |
510 | } | |
511 | /* Some error or failed "try lock" - report it */ | |
512 | if ((ret & LM_OUT_ERROR) || | |
513 | (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) { | |
514 | gl->gl_target = gl->gl_state; | |
515 | do_error(gl, ret); | |
516 | goto out; | |
517 | } | |
518 | } | |
519 | switch(state) { | |
520 | /* Unlocked due to conversion deadlock, try again */ | |
521 | case LM_ST_UNLOCKED: | |
522 | retry: | |
523 | do_xmote(gl, gh, gl->gl_target); | |
524 | break; | |
525 | /* Conversion fails, unlock and try again */ | |
526 | case LM_ST_SHARED: | |
527 | case LM_ST_DEFERRED: | |
528 | do_xmote(gl, gh, LM_ST_UNLOCKED); | |
529 | break; | |
530 | default: /* Everything else */ | |
e54c78a2 BP |
531 | fs_err(gl->gl_name.ln_sbd, "wanted %u got %u\n", |
532 | gl->gl_target, state); | |
6802e340 SW |
533 | GLOCK_BUG_ON(gl, 1); |
534 | } | |
f3dd1649 | 535 | spin_unlock(&gl->gl_lockref.lock); |
6802e340 SW |
536 | return; |
537 | } | |
538 | ||
539 | /* Fast path - we got what we asked for */ | |
540 | if (test_and_clear_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)) | |
541 | gfs2_demote_wake(gl); | |
542 | if (state != LM_ST_UNLOCKED) { | |
543 | if (glops->go_xmote_bh) { | |
f3dd1649 | 544 | spin_unlock(&gl->gl_lockref.lock); |
6802e340 | 545 | rv = glops->go_xmote_bh(gl, gh); |
f3dd1649 | 546 | spin_lock(&gl->gl_lockref.lock); |
6802e340 SW |
547 | if (rv) { |
548 | do_error(gl, rv); | |
549 | goto out; | |
550 | } | |
551 | } | |
813e0c46 SW |
552 | rv = do_promote(gl); |
553 | if (rv == 2) | |
554 | goto out_locked; | |
6802e340 SW |
555 | } |
556 | out: | |
557 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
813e0c46 | 558 | out_locked: |
f3dd1649 | 559 | spin_unlock(&gl->gl_lockref.lock); |
6802e340 SW |
560 | } |
561 | ||
6802e340 SW |
562 | /** |
563 | * do_xmote - Calls the DLM to change the state of a lock | |
564 | * @gl: The lock state | |
565 | * @gh: The holder (only for promotes) | |
566 | * @target: The target lock state | |
567 | * | |
568 | */ | |
569 | ||
570 | static void do_xmote(struct gfs2_glock *gl, struct gfs2_holder *gh, unsigned int target) | |
f3dd1649 AG |
571 | __releases(&gl->gl_lockref.lock) |
572 | __acquires(&gl->gl_lockref.lock) | |
6802e340 SW |
573 | { |
574 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
15562c43 | 575 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
b58bf407 | 576 | unsigned int lck_flags = (unsigned int)(gh ? gh->gh_flags : 0); |
6802e340 SW |
577 | int ret; |
578 | ||
601ef0d5 BP |
579 | if (target != LM_ST_UNLOCKED && glock_blocked_by_withdraw(gl) && |
580 | gh && !(gh->gh_flags & LM_FLAG_NOEXP)) | |
0d1c7ae9 | 581 | return; |
6802e340 SW |
582 | lck_flags &= (LM_FLAG_TRY | LM_FLAG_TRY_1CB | LM_FLAG_NOEXP | |
583 | LM_FLAG_PRIORITY); | |
921169ca SW |
584 | GLOCK_BUG_ON(gl, gl->gl_state == target); |
585 | GLOCK_BUG_ON(gl, gl->gl_state == gl->gl_target); | |
6802e340 SW |
586 | if ((target == LM_ST_UNLOCKED || target == LM_ST_DEFERRED) && |
587 | glops->go_inval) { | |
d99724c3 BP |
588 | /* |
589 | * If another process is already doing the invalidate, let that | |
590 | * finish first. The glock state machine will get back to this | |
591 | * holder again later. | |
592 | */ | |
593 | if (test_and_set_bit(GLF_INVALIDATE_IN_PROGRESS, | |
594 | &gl->gl_flags)) | |
595 | return; | |
6802e340 SW |
596 | do_error(gl, 0); /* Fail queued try locks */ |
597 | } | |
47a25380 | 598 | gl->gl_req = target; |
a245769f SW |
599 | set_bit(GLF_BLOCKING, &gl->gl_flags); |
600 | if ((gl->gl_req == LM_ST_UNLOCKED) || | |
601 | (gl->gl_state == LM_ST_EXCLUSIVE) || | |
602 | (lck_flags & (LM_FLAG_TRY|LM_FLAG_TRY_1CB))) | |
603 | clear_bit(GLF_BLOCKING, &gl->gl_flags); | |
f3dd1649 | 604 | spin_unlock(&gl->gl_lockref.lock); |
1c634f94 BP |
605 | if (glops->go_sync) { |
606 | ret = glops->go_sync(gl); | |
607 | /* If we had a problem syncing (due to io errors or whatever, | |
608 | * we should not invalidate the metadata or tell dlm to | |
609 | * release the glock to other nodes. | |
610 | */ | |
611 | if (ret) { | |
612 | if (cmpxchg(&sdp->sd_log_error, 0, ret)) { | |
613 | fs_err(sdp, "Error %d syncing glock \n", ret); | |
614 | gfs2_dump_glock(NULL, gl, true); | |
615 | } | |
616 | return; | |
617 | } | |
618 | } | |
33dbd1e4 BP |
619 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags)) { |
620 | /* | |
621 | * The call to go_sync should have cleared out the ail list. | |
622 | * If there are still items, we have a problem. We ought to | |
623 | * withdraw, but we can't because the withdraw code also uses | |
624 | * glocks. Warn about the error, dump the glock, then fall | |
625 | * through and wait for logd to do the withdraw for us. | |
626 | */ | |
627 | if ((atomic_read(&gl->gl_ail_count) != 0) && | |
628 | (!cmpxchg(&sdp->sd_log_error, 0, -EIO))) { | |
629 | gfs2_assert_warn(sdp, !atomic_read(&gl->gl_ail_count)); | |
630 | gfs2_dump_glock(NULL, gl, true); | |
631 | } | |
6802e340 | 632 | glops->go_inval(gl, target == LM_ST_DEFERRED ? 0 : DIO_METADATA); |
33dbd1e4 BP |
633 | clear_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags); |
634 | } | |
6802e340 SW |
635 | |
636 | gfs2_glock_hold(gl); | |
d93ae386 BP |
637 | /* |
638 | * Check for an error encountered since we called go_sync and go_inval. | |
639 | * If so, we can't withdraw from the glock code because the withdraw | |
640 | * code itself uses glocks (see function signal_our_withdraw) to | |
641 | * change the mount to read-only. Most importantly, we must not call | |
642 | * dlm to unlock the glock until the journal is in a known good state | |
643 | * (after journal replay) otherwise other nodes may use the object | |
644 | * (rgrp or dinode) and then later, journal replay will corrupt the | |
645 | * file system. The best we can do here is wait for the logd daemon | |
646 | * to see sd_log_error and withdraw, and in the meantime, requeue the | |
647 | * work for later. | |
648 | * | |
649 | * However, if we're just unlocking the lock (say, for unmount, when | |
650 | * gfs2_gl_hash_clear calls clear_glock) and recovery is complete | |
651 | * then it's okay to tell dlm to unlock it. | |
652 | */ | |
653 | if (unlikely(sdp->sd_log_error && !gfs2_withdrawn(sdp))) | |
654 | gfs2_withdraw_delayed(sdp); | |
655 | if (glock_blocked_by_withdraw(gl)) { | |
656 | if (target != LM_ST_UNLOCKED || | |
657 | test_bit(SDF_WITHDRAW_RECOVERY, &sdp->sd_flags)) { | |
658 | gfs2_glock_queue_work(gl, GL_GLOCK_DFT_HOLD); | |
659 | goto out; | |
660 | } | |
661 | } | |
662 | ||
921169ca SW |
663 | if (sdp->sd_lockstruct.ls_ops->lm_lock) { |
664 | /* lock_dlm */ | |
665 | ret = sdp->sd_lockstruct.ls_ops->lm_lock(gl, target, lck_flags); | |
3e11e530 BM |
666 | if (ret == -EINVAL && gl->gl_target == LM_ST_UNLOCKED && |
667 | target == LM_ST_UNLOCKED && | |
668 | test_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags)) { | |
669 | finish_xmote(gl, target); | |
6b0c7440 | 670 | gfs2_glock_queue_work(gl, 0); |
d93ae386 | 671 | } else if (ret) { |
e54c78a2 | 672 | fs_err(sdp, "lm_lock ret %d\n", ret); |
eb43e660 | 673 | GLOCK_BUG_ON(gl, !gfs2_withdrawn(sdp)); |
dba2d70c | 674 | } |
921169ca SW |
675 | } else { /* lock_nolock */ |
676 | finish_xmote(gl, target); | |
6b0c7440 | 677 | gfs2_glock_queue_work(gl, 0); |
6802e340 | 678 | } |
d93ae386 | 679 | out: |
f3dd1649 | 680 | spin_lock(&gl->gl_lockref.lock); |
6802e340 SW |
681 | } |
682 | ||
683 | /** | |
684 | * find_first_holder - find the first "holder" gh | |
685 | * @gl: the glock | |
686 | */ | |
687 | ||
688 | static inline struct gfs2_holder *find_first_holder(const struct gfs2_glock *gl) | |
689 | { | |
690 | struct gfs2_holder *gh; | |
691 | ||
692 | if (!list_empty(&gl->gl_holders)) { | |
693 | gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list); | |
694 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
695 | return gh; | |
696 | } | |
697 | return NULL; | |
698 | } | |
699 | ||
700 | /** | |
701 | * run_queue - do all outstanding tasks related to a glock | |
702 | * @gl: The glock in question | |
703 | * @nonblock: True if we must not block in run_queue | |
704 | * | |
705 | */ | |
706 | ||
707 | static void run_queue(struct gfs2_glock *gl, const int nonblock) | |
f3dd1649 AG |
708 | __releases(&gl->gl_lockref.lock) |
709 | __acquires(&gl->gl_lockref.lock) | |
6802e340 SW |
710 | { |
711 | struct gfs2_holder *gh = NULL; | |
813e0c46 | 712 | int ret; |
6802e340 SW |
713 | |
714 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) | |
715 | return; | |
716 | ||
717 | GLOCK_BUG_ON(gl, test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)); | |
718 | ||
719 | if (test_bit(GLF_DEMOTE, &gl->gl_flags) && | |
720 | gl->gl_demote_state != gl->gl_state) { | |
721 | if (find_first_holder(gl)) | |
d8348de0 | 722 | goto out_unlock; |
6802e340 SW |
723 | if (nonblock) |
724 | goto out_sched; | |
df5db5f9 BP |
725 | smp_mb(); |
726 | if (atomic_read(&gl->gl_revokes) != 0) | |
727 | goto out_sched; | |
6802e340 | 728 | set_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags); |
265d529c | 729 | GLOCK_BUG_ON(gl, gl->gl_demote_state == LM_ST_EXCLUSIVE); |
6802e340 SW |
730 | gl->gl_target = gl->gl_demote_state; |
731 | } else { | |
732 | if (test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
733 | gfs2_demote_wake(gl); | |
813e0c46 SW |
734 | ret = do_promote(gl); |
735 | if (ret == 0) | |
d8348de0 | 736 | goto out_unlock; |
813e0c46 | 737 | if (ret == 2) |
a228df63 | 738 | goto out; |
6802e340 SW |
739 | gh = find_first_waiter(gl); |
740 | gl->gl_target = gh->gh_state; | |
741 | if (!(gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) | |
742 | do_error(gl, 0); /* Fail queued try locks */ | |
743 | } | |
744 | do_xmote(gl, gh, gl->gl_target); | |
a228df63 | 745 | out: |
6802e340 SW |
746 | return; |
747 | ||
748 | out_sched: | |
7e71c55e | 749 | clear_bit(GLF_LOCK, &gl->gl_flags); |
4e857c58 | 750 | smp_mb__after_atomic(); |
e66cf161 | 751 | gl->gl_lockref.count++; |
6b0c7440 | 752 | __gfs2_glock_queue_work(gl, 0); |
7e71c55e SW |
753 | return; |
754 | ||
d8348de0 | 755 | out_unlock: |
6802e340 | 756 | clear_bit(GLF_LOCK, &gl->gl_flags); |
4e857c58 | 757 | smp_mb__after_atomic(); |
7e71c55e | 758 | return; |
6802e340 SW |
759 | } |
760 | ||
b94a170e BM |
761 | static void delete_work_func(struct work_struct *work) |
762 | { | |
763 | struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_delete); | |
15562c43 | 764 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
ec5ec66b | 765 | struct inode *inode; |
044b9414 SW |
766 | u64 no_addr = gl->gl_name.ln_number; |
767 | ||
a4923865 BP |
768 | /* If someone's using this glock to create a new dinode, the block must |
769 | have been freed by another node, then re-used, in which case our | |
770 | iopen callback is too late after the fact. Ignore it. */ | |
771 | if (test_bit(GLF_INODE_CREATING, &gl->gl_flags)) | |
772 | goto out; | |
773 | ||
ec5ec66b | 774 | inode = gfs2_lookup_by_inum(sdp, no_addr, NULL, GFS2_BLKST_UNLINKED); |
15a798f7 | 775 | if (!IS_ERR_OR_NULL(inode)) { |
044b9414 SW |
776 | d_prune_aliases(inode); |
777 | iput(inode); | |
b94a170e | 778 | } |
a4923865 | 779 | out: |
b94a170e BM |
780 | gfs2_glock_put(gl); |
781 | } | |
782 | ||
c4f68a13 BM |
783 | static void glock_work_func(struct work_struct *work) |
784 | { | |
6802e340 | 785 | unsigned long delay = 0; |
c4f68a13 | 786 | struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_work.work); |
6b0c7440 | 787 | unsigned int drop_refs = 1; |
c4f68a13 | 788 | |
26bb7505 | 789 | if (test_and_clear_bit(GLF_REPLY_PENDING, &gl->gl_flags)) { |
6802e340 | 790 | finish_xmote(gl, gl->gl_reply); |
6b0c7440 | 791 | drop_refs++; |
26bb7505 | 792 | } |
f3dd1649 | 793 | spin_lock(&gl->gl_lockref.lock); |
f90e5b5b | 794 | if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && |
265d529c SW |
795 | gl->gl_state != LM_ST_UNLOCKED && |
796 | gl->gl_demote_state != LM_ST_EXCLUSIVE) { | |
6802e340 | 797 | unsigned long holdtime, now = jiffies; |
f90e5b5b | 798 | |
7cf8dcd3 | 799 | holdtime = gl->gl_tchange + gl->gl_hold_time; |
6802e340 SW |
800 | if (time_before(now, holdtime)) |
801 | delay = holdtime - now; | |
f90e5b5b BP |
802 | |
803 | if (!delay) { | |
804 | clear_bit(GLF_PENDING_DEMOTE, &gl->gl_flags); | |
805 | set_bit(GLF_DEMOTE, &gl->gl_flags); | |
806 | } | |
6802e340 SW |
807 | } |
808 | run_queue(gl, 0); | |
6b0c7440 AG |
809 | if (delay) { |
810 | /* Keep one glock reference for the work we requeue. */ | |
811 | drop_refs--; | |
7cf8dcd3 BP |
812 | if (gl->gl_name.ln_type != LM_TYPE_INODE) |
813 | delay = 0; | |
6b0c7440 | 814 | __gfs2_glock_queue_work(gl, delay); |
7cf8dcd3 | 815 | } |
6b0c7440 AG |
816 | |
817 | /* | |
818 | * Drop the remaining glock references manually here. (Mind that | |
819 | * __gfs2_glock_queue_work depends on the lockref spinlock begin held | |
820 | * here as well.) | |
821 | */ | |
822 | gl->gl_lockref.count -= drop_refs; | |
823 | if (!gl->gl_lockref.count) { | |
824 | __gfs2_glock_put(gl); | |
825 | return; | |
826 | } | |
827 | spin_unlock(&gl->gl_lockref.lock); | |
c4f68a13 BM |
828 | } |
829 | ||
0515480a AG |
830 | static struct gfs2_glock *find_insert_glock(struct lm_lockname *name, |
831 | struct gfs2_glock *new) | |
832 | { | |
833 | struct wait_glock_queue wait; | |
a91323e2 | 834 | wait_queue_head_t *wq = glock_waitqueue(name); |
0515480a AG |
835 | struct gfs2_glock *gl; |
836 | ||
a91323e2 AG |
837 | wait.name = name; |
838 | init_wait(&wait.wait); | |
839 | wait.wait.func = glock_wake_function; | |
840 | ||
0515480a | 841 | again: |
a91323e2 | 842 | prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE); |
0515480a AG |
843 | rcu_read_lock(); |
844 | if (new) { | |
845 | gl = rhashtable_lookup_get_insert_fast(&gl_hash_table, | |
846 | &new->gl_node, ht_parms); | |
847 | if (IS_ERR(gl)) | |
848 | goto out; | |
849 | } else { | |
850 | gl = rhashtable_lookup_fast(&gl_hash_table, | |
851 | name, ht_parms); | |
852 | } | |
853 | if (gl && !lockref_get_not_dead(&gl->gl_lockref)) { | |
854 | rcu_read_unlock(); | |
855 | schedule(); | |
856 | goto again; | |
857 | } | |
858 | out: | |
859 | rcu_read_unlock(); | |
a91323e2 | 860 | finish_wait(wq, &wait.wait); |
0515480a AG |
861 | return gl; |
862 | } | |
863 | ||
b3b94faa DT |
864 | /** |
865 | * gfs2_glock_get() - Get a glock, or create one if one doesn't exist | |
866 | * @sdp: The GFS2 superblock | |
867 | * @number: the lock number | |
868 | * @glops: The glock_operations to use | |
869 | * @create: If 0, don't create the glock if it doesn't exist | |
870 | * @glp: the glock is returned here | |
871 | * | |
872 | * This does not lock a glock, just finds/creates structures for one. | |
873 | * | |
874 | * Returns: errno | |
875 | */ | |
876 | ||
cd915493 | 877 | int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 | 878 | const struct gfs2_glock_operations *glops, int create, |
b3b94faa DT |
879 | struct gfs2_glock **glp) |
880 | { | |
009d8518 | 881 | struct super_block *s = sdp->sd_vfs; |
15562c43 BP |
882 | struct lm_lockname name = { .ln_number = number, |
883 | .ln_type = glops->go_type, | |
884 | .ln_sbd = sdp }; | |
0a52aba7 | 885 | struct gfs2_glock *gl, *tmp; |
009d8518 | 886 | struct address_space *mapping; |
bc015cb8 | 887 | struct kmem_cache *cachep; |
0a52aba7 | 888 | int ret = 0; |
b3b94faa | 889 | |
0515480a AG |
890 | gl = find_insert_glock(&name, NULL); |
891 | if (gl) { | |
892 | *glp = gl; | |
b3b94faa | 893 | return 0; |
0515480a | 894 | } |
64d576ba SW |
895 | if (!create) |
896 | return -ENOENT; | |
b3b94faa | 897 | |
009d8518 | 898 | if (glops->go_flags & GLOF_ASPACE) |
bc015cb8 | 899 | cachep = gfs2_glock_aspace_cachep; |
009d8518 | 900 | else |
bc015cb8 | 901 | cachep = gfs2_glock_cachep; |
fe0bbd29 | 902 | gl = kmem_cache_alloc(cachep, GFP_NOFS); |
b3b94faa DT |
903 | if (!gl) |
904 | return -ENOMEM; | |
905 | ||
dba2d70c | 906 | memset(&gl->gl_lksb, 0, sizeof(struct dlm_lksb)); |
dba2d70c DT |
907 | |
908 | if (glops->go_flags & GLOF_LVB) { | |
f7be987b | 909 | gl->gl_lksb.sb_lvbptr = kzalloc(GDLM_LVB_SIZE, GFP_NOFS); |
4e2f8849 | 910 | if (!gl->gl_lksb.sb_lvbptr) { |
dba2d70c DT |
911 | kmem_cache_free(cachep, gl); |
912 | return -ENOMEM; | |
913 | } | |
dba2d70c DT |
914 | } |
915 | ||
8f05228e | 916 | atomic_inc(&sdp->sd_glock_disposal); |
88ffbf3e | 917 | gl->gl_node.next = NULL; |
ec45d9f5 | 918 | gl->gl_flags = 0; |
b3b94faa | 919 | gl->gl_name = name; |
e66cf161 | 920 | gl->gl_lockref.count = 1; |
b3b94faa | 921 | gl->gl_state = LM_ST_UNLOCKED; |
6802e340 | 922 | gl->gl_target = LM_ST_UNLOCKED; |
c4f68a13 | 923 | gl->gl_demote_state = LM_ST_EXCLUSIVE; |
b3b94faa | 924 | gl->gl_ops = glops; |
8b0e1953 | 925 | gl->gl_dstamp = 0; |
a245769f SW |
926 | preempt_disable(); |
927 | /* We use the global stats to estimate the initial per-glock stats */ | |
928 | gl->gl_stats = this_cpu_ptr(sdp->sd_lkstats)->lkstats[glops->go_type]; | |
929 | preempt_enable(); | |
930 | gl->gl_stats.stats[GFS2_LKS_DCOUNT] = 0; | |
931 | gl->gl_stats.stats[GFS2_LKS_QCOUNT] = 0; | |
c4f68a13 | 932 | gl->gl_tchange = jiffies; |
ec45d9f5 | 933 | gl->gl_object = NULL; |
7cf8dcd3 | 934 | gl->gl_hold_time = GL_GLOCK_DFT_HOLD; |
c4f68a13 | 935 | INIT_DELAYED_WORK(&gl->gl_work, glock_work_func); |
b94a170e | 936 | INIT_WORK(&gl->gl_delete, delete_work_func); |
b3b94faa | 937 | |
009d8518 SW |
938 | mapping = gfs2_glock2aspace(gl); |
939 | if (mapping) { | |
940 | mapping->a_ops = &gfs2_meta_aops; | |
941 | mapping->host = s->s_bdev->bd_inode; | |
942 | mapping->flags = 0; | |
943 | mapping_set_gfp_mask(mapping, GFP_NOFS); | |
252aa6f5 | 944 | mapping->private_data = NULL; |
009d8518 | 945 | mapping->writeback_index = 0; |
b3b94faa DT |
946 | } |
947 | ||
0515480a | 948 | tmp = find_insert_glock(&name, gl); |
0a52aba7 | 949 | if (!tmp) { |
88ffbf3e | 950 | *glp = gl; |
0a52aba7 | 951 | goto out; |
b3b94faa | 952 | } |
0a52aba7 AG |
953 | if (IS_ERR(tmp)) { |
954 | ret = PTR_ERR(tmp); | |
955 | goto out_free; | |
956 | } | |
0515480a | 957 | *glp = tmp; |
0a52aba7 AG |
958 | |
959 | out_free: | |
88ffbf3e BP |
960 | kfree(gl->gl_lksb.sb_lvbptr); |
961 | kmem_cache_free(cachep, gl); | |
962 | atomic_dec(&sdp->sd_glock_disposal); | |
b3b94faa | 963 | |
0a52aba7 | 964 | out: |
88ffbf3e | 965 | return ret; |
b3b94faa DT |
966 | } |
967 | ||
968 | /** | |
969 | * gfs2_holder_init - initialize a struct gfs2_holder in the default way | |
970 | * @gl: the glock | |
971 | * @state: the state we're requesting | |
972 | * @flags: the modifier flags | |
973 | * @gh: the holder structure | |
974 | * | |
975 | */ | |
976 | ||
b58bf407 | 977 | void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, u16 flags, |
b3b94faa DT |
978 | struct gfs2_holder *gh) |
979 | { | |
980 | INIT_LIST_HEAD(&gh->gh_list); | |
981 | gh->gh_gl = gl; | |
d29c0afe | 982 | gh->gh_ip = _RET_IP_; |
b1e058da | 983 | gh->gh_owner_pid = get_pid(task_pid(current)); |
b3b94faa DT |
984 | gh->gh_state = state; |
985 | gh->gh_flags = flags; | |
986 | gh->gh_error = 0; | |
987 | gh->gh_iflags = 0; | |
b3b94faa DT |
988 | gfs2_glock_hold(gl); |
989 | } | |
990 | ||
991 | /** | |
992 | * gfs2_holder_reinit - reinitialize a struct gfs2_holder so we can requeue it | |
993 | * @state: the state we're requesting | |
994 | * @flags: the modifier flags | |
995 | * @gh: the holder structure | |
996 | * | |
997 | * Don't mess with the glock. | |
998 | * | |
999 | */ | |
1000 | ||
b58bf407 | 1001 | void gfs2_holder_reinit(unsigned int state, u16 flags, struct gfs2_holder *gh) |
b3b94faa DT |
1002 | { |
1003 | gh->gh_state = state; | |
579b78a4 | 1004 | gh->gh_flags = flags; |
3b8249f6 | 1005 | gh->gh_iflags = 0; |
d29c0afe | 1006 | gh->gh_ip = _RET_IP_; |
30badc95 | 1007 | put_pid(gh->gh_owner_pid); |
1a0eae88 | 1008 | gh->gh_owner_pid = get_pid(task_pid(current)); |
b3b94faa DT |
1009 | } |
1010 | ||
1011 | /** | |
1012 | * gfs2_holder_uninit - uninitialize a holder structure (drop glock reference) | |
1013 | * @gh: the holder structure | |
1014 | * | |
1015 | */ | |
1016 | ||
1017 | void gfs2_holder_uninit(struct gfs2_holder *gh) | |
1018 | { | |
b1e058da | 1019 | put_pid(gh->gh_owner_pid); |
b3b94faa | 1020 | gfs2_glock_put(gh->gh_gl); |
6df9f9a2 | 1021 | gfs2_holder_mark_uninitialized(gh); |
d0dc80db | 1022 | gh->gh_ip = 0; |
b3b94faa DT |
1023 | } |
1024 | ||
01123cf1 AG |
1025 | static void gfs2_glock_update_hold_time(struct gfs2_glock *gl, |
1026 | unsigned long start_time) | |
1027 | { | |
1028 | /* Have we waited longer that a second? */ | |
1029 | if (time_after(jiffies, start_time + HZ)) { | |
1030 | /* Lengthen the minimum hold time. */ | |
1031 | gl->gl_hold_time = min(gl->gl_hold_time + GL_GLOCK_HOLD_INCR, | |
1032 | GL_GLOCK_MAX_HOLD); | |
1033 | } | |
1034 | } | |
1035 | ||
07a79049 BP |
1036 | /** |
1037 | * gfs2_glock_wait - wait on a glock acquisition | |
1038 | * @gh: the glock holder | |
1039 | * | |
1040 | * Returns: 0 on success | |
1041 | */ | |
1042 | ||
1043 | int gfs2_glock_wait(struct gfs2_holder *gh) | |
da755fdb | 1044 | { |
01123cf1 | 1045 | unsigned long start_time = jiffies; |
7cf8dcd3 | 1046 | |
6802e340 | 1047 | might_sleep(); |
74316201 | 1048 | wait_on_bit(&gh->gh_iflags, HIF_WAIT, TASK_UNINTERRUPTIBLE); |
01123cf1 | 1049 | gfs2_glock_update_hold_time(gh->gh_gl, start_time); |
07a79049 | 1050 | return gh->gh_error; |
da755fdb SW |
1051 | } |
1052 | ||
ad26967b BP |
1053 | static int glocks_pending(unsigned int num_gh, struct gfs2_holder *ghs) |
1054 | { | |
1055 | int i; | |
1056 | ||
1057 | for (i = 0; i < num_gh; i++) | |
1058 | if (test_bit(HIF_WAIT, &ghs[i].gh_iflags)) | |
1059 | return 1; | |
1060 | return 0; | |
1061 | } | |
1062 | ||
1063 | /** | |
1064 | * gfs2_glock_async_wait - wait on multiple asynchronous glock acquisitions | |
1065 | * @num_gh: the number of holders in the array | |
1066 | * @ghs: the glock holder array | |
1067 | * | |
1068 | * Returns: 0 on success, meaning all glocks have been granted and are held. | |
1069 | * -ESTALE if the request timed out, meaning all glocks were released, | |
1070 | * and the caller should retry the operation. | |
1071 | */ | |
1072 | ||
1073 | int gfs2_glock_async_wait(unsigned int num_gh, struct gfs2_holder *ghs) | |
1074 | { | |
1075 | struct gfs2_sbd *sdp = ghs[0].gh_gl->gl_name.ln_sbd; | |
1076 | int i, ret = 0, timeout = 0; | |
1077 | unsigned long start_time = jiffies; | |
1078 | bool keep_waiting; | |
1079 | ||
1080 | might_sleep(); | |
1081 | /* | |
1082 | * Total up the (minimum hold time * 2) of all glocks and use that to | |
1083 | * determine the max amount of time we should wait. | |
1084 | */ | |
1085 | for (i = 0; i < num_gh; i++) | |
1086 | timeout += ghs[i].gh_gl->gl_hold_time << 1; | |
1087 | ||
1088 | wait_for_dlm: | |
1089 | if (!wait_event_timeout(sdp->sd_async_glock_wait, | |
1090 | !glocks_pending(num_gh, ghs), timeout)) | |
1091 | ret = -ESTALE; /* request timed out. */ | |
1092 | ||
1093 | /* | |
1094 | * If dlm granted all our requests, we need to adjust the glock | |
1095 | * minimum hold time values according to how long we waited. | |
1096 | * | |
1097 | * If our request timed out, we need to repeatedly release any held | |
1098 | * glocks we acquired thus far to allow dlm to acquire the remaining | |
1099 | * glocks without deadlocking. We cannot currently cancel outstanding | |
1100 | * glock acquisitions. | |
1101 | * | |
1102 | * The HIF_WAIT bit tells us which requests still need a response from | |
1103 | * dlm. | |
1104 | * | |
1105 | * If dlm sent us any errors, we return the first error we find. | |
1106 | */ | |
1107 | keep_waiting = false; | |
1108 | for (i = 0; i < num_gh; i++) { | |
1109 | /* Skip holders we have already dequeued below. */ | |
1110 | if (!gfs2_holder_queued(&ghs[i])) | |
1111 | continue; | |
1112 | /* Skip holders with a pending DLM response. */ | |
1113 | if (test_bit(HIF_WAIT, &ghs[i].gh_iflags)) { | |
1114 | keep_waiting = true; | |
1115 | continue; | |
1116 | } | |
1117 | ||
1118 | if (test_bit(HIF_HOLDER, &ghs[i].gh_iflags)) { | |
1119 | if (ret == -ESTALE) | |
1120 | gfs2_glock_dq(&ghs[i]); | |
1121 | else | |
1122 | gfs2_glock_update_hold_time(ghs[i].gh_gl, | |
1123 | start_time); | |
1124 | } | |
1125 | if (!ret) | |
1126 | ret = ghs[i].gh_error; | |
1127 | } | |
1128 | ||
1129 | if (keep_waiting) | |
1130 | goto wait_for_dlm; | |
1131 | ||
1132 | /* | |
1133 | * At this point, we've either acquired all locks or released them all. | |
1134 | */ | |
1135 | return ret; | |
1136 | } | |
1137 | ||
b3b94faa | 1138 | /** |
6802e340 SW |
1139 | * handle_callback - process a demote request |
1140 | * @gl: the glock | |
1141 | * @state: the state the caller wants us to change to | |
b3b94faa | 1142 | * |
6802e340 SW |
1143 | * There are only two requests that we are going to see in actual |
1144 | * practise: LM_ST_SHARED and LM_ST_UNLOCKED | |
b3b94faa DT |
1145 | */ |
1146 | ||
6802e340 | 1147 | static void handle_callback(struct gfs2_glock *gl, unsigned int state, |
81ffbf65 | 1148 | unsigned long delay, bool remote) |
b3b94faa | 1149 | { |
6802e340 | 1150 | int bit = delay ? GLF_PENDING_DEMOTE : GLF_DEMOTE; |
b3b94faa | 1151 | |
6802e340 SW |
1152 | set_bit(bit, &gl->gl_flags); |
1153 | if (gl->gl_demote_state == LM_ST_EXCLUSIVE) { | |
1154 | gl->gl_demote_state = state; | |
1155 | gl->gl_demote_time = jiffies; | |
6802e340 SW |
1156 | } else if (gl->gl_demote_state != LM_ST_UNLOCKED && |
1157 | gl->gl_demote_state != state) { | |
1158 | gl->gl_demote_state = LM_ST_UNLOCKED; | |
b3b94faa | 1159 | } |
b94a170e | 1160 | if (gl->gl_ops->go_callback) |
81ffbf65 | 1161 | gl->gl_ops->go_callback(gl, remote); |
7bd8b2eb | 1162 | trace_gfs2_demote_rq(gl, remote); |
b3b94faa DT |
1163 | } |
1164 | ||
6802e340 | 1165 | void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...) |
7c52b166 | 1166 | { |
5e69069c | 1167 | struct va_format vaf; |
7c52b166 RP |
1168 | va_list args; |
1169 | ||
1170 | va_start(args, fmt); | |
5e69069c | 1171 | |
6802e340 | 1172 | if (seq) { |
1bb49303 | 1173 | seq_vprintf(seq, fmt, args); |
6802e340 | 1174 | } else { |
5e69069c JP |
1175 | vaf.fmt = fmt; |
1176 | vaf.va = &args; | |
1177 | ||
d77d1b58 | 1178 | pr_err("%pV", &vaf); |
6802e340 | 1179 | } |
5e69069c | 1180 | |
7c52b166 RP |
1181 | va_end(args); |
1182 | } | |
1183 | ||
b3b94faa DT |
1184 | /** |
1185 | * add_to_queue - Add a holder to the wait queue (but look for recursion) | |
1186 | * @gh: the holder structure to add | |
1187 | * | |
6802e340 SW |
1188 | * Eventually we should move the recursive locking trap to a |
1189 | * debugging option or something like that. This is the fast | |
1190 | * path and needs to have the minimum number of distractions. | |
1191 | * | |
b3b94faa DT |
1192 | */ |
1193 | ||
6802e340 | 1194 | static inline void add_to_queue(struct gfs2_holder *gh) |
f3dd1649 AG |
1195 | __releases(&gl->gl_lockref.lock) |
1196 | __acquires(&gl->gl_lockref.lock) | |
b3b94faa DT |
1197 | { |
1198 | struct gfs2_glock *gl = gh->gh_gl; | |
15562c43 | 1199 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
6802e340 SW |
1200 | struct list_head *insert_pt = NULL; |
1201 | struct gfs2_holder *gh2; | |
e5dc76b9 | 1202 | int try_futile = 0; |
b3b94faa | 1203 | |
ad26967b | 1204 | GLOCK_BUG_ON(gl, gh->gh_owner_pid == NULL); |
fee852e3 | 1205 | if (test_and_set_bit(HIF_WAIT, &gh->gh_iflags)) |
ad26967b | 1206 | GLOCK_BUG_ON(gl, true); |
190562bd | 1207 | |
6802e340 SW |
1208 | if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { |
1209 | if (test_bit(GLF_LOCK, &gl->gl_flags)) | |
e5dc76b9 | 1210 | try_futile = !may_grant(gl, gh); |
6802e340 SW |
1211 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags)) |
1212 | goto fail; | |
1213 | } | |
1214 | ||
1215 | list_for_each_entry(gh2, &gl->gl_holders, gh_list) { | |
1216 | if (unlikely(gh2->gh_owner_pid == gh->gh_owner_pid && | |
1217 | (gh->gh_gl->gl_ops->go_type != LM_TYPE_FLOCK))) | |
1218 | goto trap_recursive; | |
e5dc76b9 BP |
1219 | if (try_futile && |
1220 | !(gh2->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) { | |
6802e340 SW |
1221 | fail: |
1222 | gh->gh_error = GLR_TRYFAILED; | |
1223 | gfs2_holder_wake(gh); | |
1224 | return; | |
b4c20166 | 1225 | } |
6802e340 SW |
1226 | if (test_bit(HIF_HOLDER, &gh2->gh_iflags)) |
1227 | continue; | |
1228 | if (unlikely((gh->gh_flags & LM_FLAG_PRIORITY) && !insert_pt)) | |
1229 | insert_pt = &gh2->gh_list; | |
1230 | } | |
7b5e3d5f | 1231 | set_bit(GLF_QUEUED, &gl->gl_flags); |
edae38a6 | 1232 | trace_gfs2_glock_queue(gh, 1); |
a245769f SW |
1233 | gfs2_glstats_inc(gl, GFS2_LKS_QCOUNT); |
1234 | gfs2_sbstats_inc(gl, GFS2_LKS_QCOUNT); | |
6802e340 SW |
1235 | if (likely(insert_pt == NULL)) { |
1236 | list_add_tail(&gh->gh_list, &gl->gl_holders); | |
1237 | if (unlikely(gh->gh_flags & LM_FLAG_PRIORITY)) | |
1238 | goto do_cancel; | |
1239 | return; | |
1240 | } | |
1241 | list_add_tail(&gh->gh_list, insert_pt); | |
1242 | do_cancel: | |
1243 | gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list); | |
1244 | if (!(gh->gh_flags & LM_FLAG_PRIORITY)) { | |
f3dd1649 | 1245 | spin_unlock(&gl->gl_lockref.lock); |
048bca22 | 1246 | if (sdp->sd_lockstruct.ls_ops->lm_cancel) |
f057f6cd | 1247 | sdp->sd_lockstruct.ls_ops->lm_cancel(gl); |
f3dd1649 | 1248 | spin_lock(&gl->gl_lockref.lock); |
b3b94faa | 1249 | } |
6802e340 | 1250 | return; |
b3b94faa | 1251 | |
6802e340 | 1252 | trap_recursive: |
e54c78a2 BP |
1253 | fs_err(sdp, "original: %pSR\n", (void *)gh2->gh_ip); |
1254 | fs_err(sdp, "pid: %d\n", pid_nr(gh2->gh_owner_pid)); | |
1255 | fs_err(sdp, "lock type: %d req lock state : %d\n", | |
6802e340 | 1256 | gh2->gh_gl->gl_name.ln_type, gh2->gh_state); |
e54c78a2 BP |
1257 | fs_err(sdp, "new: %pSR\n", (void *)gh->gh_ip); |
1258 | fs_err(sdp, "pid: %d\n", pid_nr(gh->gh_owner_pid)); | |
1259 | fs_err(sdp, "lock type: %d req lock state : %d\n", | |
6802e340 | 1260 | gh->gh_gl->gl_name.ln_type, gh->gh_state); |
3792ce97 | 1261 | gfs2_dump_glock(NULL, gl, true); |
6802e340 | 1262 | BUG(); |
b3b94faa DT |
1263 | } |
1264 | ||
1265 | /** | |
1266 | * gfs2_glock_nq - enqueue a struct gfs2_holder onto a glock (acquire a glock) | |
1267 | * @gh: the holder structure | |
1268 | * | |
1269 | * if (gh->gh_flags & GL_ASYNC), this never returns an error | |
1270 | * | |
1271 | * Returns: 0, GLR_TRYFAILED, or errno on failure | |
1272 | */ | |
1273 | ||
1274 | int gfs2_glock_nq(struct gfs2_holder *gh) | |
1275 | { | |
1276 | struct gfs2_glock *gl = gh->gh_gl; | |
b3b94faa DT |
1277 | int error = 0; |
1278 | ||
601ef0d5 | 1279 | if (glock_blocked_by_withdraw(gl) && !(gh->gh_flags & LM_FLAG_NOEXP)) |
b3b94faa | 1280 | return -EIO; |
b3b94faa | 1281 | |
f42ab085 SW |
1282 | if (test_bit(GLF_LRU, &gl->gl_flags)) |
1283 | gfs2_glock_remove_from_lru(gl); | |
1284 | ||
f3dd1649 | 1285 | spin_lock(&gl->gl_lockref.lock); |
b3b94faa | 1286 | add_to_queue(gh); |
01b172b7 BP |
1287 | if (unlikely((LM_FLAG_NOEXP & gh->gh_flags) && |
1288 | test_and_clear_bit(GLF_FROZEN, &gl->gl_flags))) { | |
0809f6ec | 1289 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
01b172b7 | 1290 | gl->gl_lockref.count++; |
6b0c7440 | 1291 | __gfs2_glock_queue_work(gl, 0); |
01b172b7 | 1292 | } |
6802e340 | 1293 | run_queue(gl, 1); |
f3dd1649 | 1294 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa | 1295 | |
6802e340 SW |
1296 | if (!(gh->gh_flags & GL_ASYNC)) |
1297 | error = gfs2_glock_wait(gh); | |
b3b94faa | 1298 | |
b3b94faa DT |
1299 | return error; |
1300 | } | |
1301 | ||
1302 | /** | |
1303 | * gfs2_glock_poll - poll to see if an async request has been completed | |
1304 | * @gh: the holder | |
1305 | * | |
1306 | * Returns: 1 if the request is ready to be gfs2_glock_wait()ed on | |
1307 | */ | |
1308 | ||
1309 | int gfs2_glock_poll(struct gfs2_holder *gh) | |
1310 | { | |
6802e340 | 1311 | return test_bit(HIF_WAIT, &gh->gh_iflags) ? 0 : 1; |
b3b94faa DT |
1312 | } |
1313 | ||
1314 | /** | |
1315 | * gfs2_glock_dq - dequeue a struct gfs2_holder from a glock (release a glock) | |
1316 | * @gh: the glock holder | |
1317 | * | |
1318 | */ | |
1319 | ||
1320 | void gfs2_glock_dq(struct gfs2_holder *gh) | |
1321 | { | |
1322 | struct gfs2_glock *gl = gh->gh_gl; | |
601ef0d5 | 1323 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
c4f68a13 | 1324 | unsigned delay = 0; |
6802e340 | 1325 | int fast_path = 0; |
b3b94faa | 1326 | |
f3dd1649 | 1327 | spin_lock(&gl->gl_lockref.lock); |
601ef0d5 BP |
1328 | /* |
1329 | * If we're in the process of file system withdraw, we cannot just | |
1330 | * dequeue any glocks until our journal is recovered, lest we | |
1331 | * introduce file system corruption. We need two exceptions to this | |
1332 | * rule: We need to allow unlocking of nondisk glocks and the glock | |
1333 | * for our own journal that needs recovery. | |
1334 | */ | |
1335 | if (test_bit(SDF_WITHDRAW_RECOVERY, &sdp->sd_flags) && | |
1336 | glock_blocked_by_withdraw(gl) && | |
1337 | gh->gh_gl != sdp->sd_jinode_gl) { | |
1338 | sdp->sd_glock_dqs_held++; | |
1339 | might_sleep(); | |
1340 | wait_on_bit(&sdp->sd_flags, SDF_WITHDRAW_RECOVERY, | |
1341 | TASK_UNINTERRUPTIBLE); | |
1342 | } | |
b3b94faa | 1343 | if (gh->gh_flags & GL_NOCACHE) |
81ffbf65 | 1344 | handle_callback(gl, LM_ST_UNLOCKED, 0, false); |
b3b94faa | 1345 | |
b3b94faa | 1346 | list_del_init(&gh->gh_list); |
7508abc4 | 1347 | clear_bit(HIF_HOLDER, &gh->gh_iflags); |
6802e340 | 1348 | if (find_first_holder(gl) == NULL) { |
6802e340 SW |
1349 | if (list_empty(&gl->gl_holders) && |
1350 | !test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && | |
1351 | !test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
1352 | fast_path = 1; | |
b3b94faa | 1353 | } |
7881ef3f | 1354 | if (!test_bit(GLF_LFLUSH, &gl->gl_flags) && demote_ok(gl)) |
4abb6ad9 BP |
1355 | gfs2_glock_add_to_lru(gl); |
1356 | ||
63997775 | 1357 | trace_gfs2_glock_queue(gh, 0); |
6b0c7440 AG |
1358 | if (unlikely(!fast_path)) { |
1359 | gl->gl_lockref.count++; | |
1360 | if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && | |
1361 | !test_bit(GLF_DEMOTE, &gl->gl_flags) && | |
1362 | gl->gl_name.ln_type == LM_TYPE_INODE) | |
1363 | delay = gl->gl_hold_time; | |
1364 | __gfs2_glock_queue_work(gl, delay); | |
1365 | } | |
f3dd1649 | 1366 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa DT |
1367 | } |
1368 | ||
d93cfa98 AD |
1369 | void gfs2_glock_dq_wait(struct gfs2_holder *gh) |
1370 | { | |
1371 | struct gfs2_glock *gl = gh->gh_gl; | |
1372 | gfs2_glock_dq(gh); | |
81e1d450 | 1373 | might_sleep(); |
74316201 | 1374 | wait_on_bit(&gl->gl_flags, GLF_DEMOTE, TASK_UNINTERRUPTIBLE); |
d93cfa98 AD |
1375 | } |
1376 | ||
b3b94faa DT |
1377 | /** |
1378 | * gfs2_glock_dq_uninit - dequeue a holder from a glock and initialize it | |
1379 | * @gh: the holder structure | |
1380 | * | |
1381 | */ | |
1382 | ||
1383 | void gfs2_glock_dq_uninit(struct gfs2_holder *gh) | |
1384 | { | |
1385 | gfs2_glock_dq(gh); | |
1386 | gfs2_holder_uninit(gh); | |
1387 | } | |
1388 | ||
1389 | /** | |
1390 | * gfs2_glock_nq_num - acquire a glock based on lock number | |
1391 | * @sdp: the filesystem | |
1392 | * @number: the lock number | |
1393 | * @glops: the glock operations for the type of glock | |
1394 | * @state: the state to acquire the glock in | |
25985edc | 1395 | * @flags: modifier flags for the acquisition |
b3b94faa DT |
1396 | * @gh: the struct gfs2_holder |
1397 | * | |
1398 | * Returns: errno | |
1399 | */ | |
1400 | ||
cd915493 | 1401 | int gfs2_glock_nq_num(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 | 1402 | const struct gfs2_glock_operations *glops, |
b58bf407 | 1403 | unsigned int state, u16 flags, struct gfs2_holder *gh) |
b3b94faa DT |
1404 | { |
1405 | struct gfs2_glock *gl; | |
1406 | int error; | |
1407 | ||
1408 | error = gfs2_glock_get(sdp, number, glops, CREATE, &gl); | |
1409 | if (!error) { | |
1410 | error = gfs2_glock_nq_init(gl, state, flags, gh); | |
1411 | gfs2_glock_put(gl); | |
1412 | } | |
1413 | ||
1414 | return error; | |
1415 | } | |
1416 | ||
1417 | /** | |
1418 | * glock_compare - Compare two struct gfs2_glock structures for sorting | |
1419 | * @arg_a: the first structure | |
1420 | * @arg_b: the second structure | |
1421 | * | |
1422 | */ | |
1423 | ||
1424 | static int glock_compare(const void *arg_a, const void *arg_b) | |
1425 | { | |
a5e08a9e SW |
1426 | const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a; |
1427 | const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b; | |
1428 | const struct lm_lockname *a = &gh_a->gh_gl->gl_name; | |
1429 | const struct lm_lockname *b = &gh_b->gh_gl->gl_name; | |
b3b94faa DT |
1430 | |
1431 | if (a->ln_number > b->ln_number) | |
a5e08a9e SW |
1432 | return 1; |
1433 | if (a->ln_number < b->ln_number) | |
1434 | return -1; | |
1c0f4872 | 1435 | BUG_ON(gh_a->gh_gl->gl_ops->go_type == gh_b->gh_gl->gl_ops->go_type); |
a5e08a9e | 1436 | return 0; |
b3b94faa DT |
1437 | } |
1438 | ||
1439 | /** | |
1440 | * nq_m_sync - synchonously acquire more than one glock in deadlock free order | |
1441 | * @num_gh: the number of structures | |
1442 | * @ghs: an array of struct gfs2_holder structures | |
1443 | * | |
1444 | * Returns: 0 on success (all glocks acquired), | |
1445 | * errno on failure (no glocks acquired) | |
1446 | */ | |
1447 | ||
1448 | static int nq_m_sync(unsigned int num_gh, struct gfs2_holder *ghs, | |
1449 | struct gfs2_holder **p) | |
1450 | { | |
1451 | unsigned int x; | |
1452 | int error = 0; | |
1453 | ||
1454 | for (x = 0; x < num_gh; x++) | |
1455 | p[x] = &ghs[x]; | |
1456 | ||
1457 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare, NULL); | |
1458 | ||
1459 | for (x = 0; x < num_gh; x++) { | |
1460 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1461 | ||
1462 | error = gfs2_glock_nq(p[x]); | |
1463 | if (error) { | |
1464 | while (x--) | |
1465 | gfs2_glock_dq(p[x]); | |
1466 | break; | |
1467 | } | |
1468 | } | |
1469 | ||
1470 | return error; | |
1471 | } | |
1472 | ||
1473 | /** | |
1474 | * gfs2_glock_nq_m - acquire multiple glocks | |
1475 | * @num_gh: the number of structures | |
1476 | * @ghs: an array of struct gfs2_holder structures | |
1477 | * | |
b3b94faa DT |
1478 | * |
1479 | * Returns: 0 on success (all glocks acquired), | |
1480 | * errno on failure (no glocks acquired) | |
1481 | */ | |
1482 | ||
1483 | int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1484 | { | |
eaf5bd3c SW |
1485 | struct gfs2_holder *tmp[4]; |
1486 | struct gfs2_holder **pph = tmp; | |
b3b94faa DT |
1487 | int error = 0; |
1488 | ||
eaf5bd3c SW |
1489 | switch(num_gh) { |
1490 | case 0: | |
b3b94faa | 1491 | return 0; |
eaf5bd3c | 1492 | case 1: |
b3b94faa DT |
1493 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); |
1494 | return gfs2_glock_nq(ghs); | |
eaf5bd3c SW |
1495 | default: |
1496 | if (num_gh <= 4) | |
b3b94faa | 1497 | break; |
6da2ec56 KC |
1498 | pph = kmalloc_array(num_gh, sizeof(struct gfs2_holder *), |
1499 | GFP_NOFS); | |
eaf5bd3c SW |
1500 | if (!pph) |
1501 | return -ENOMEM; | |
b3b94faa DT |
1502 | } |
1503 | ||
eaf5bd3c | 1504 | error = nq_m_sync(num_gh, ghs, pph); |
b3b94faa | 1505 | |
eaf5bd3c SW |
1506 | if (pph != tmp) |
1507 | kfree(pph); | |
b3b94faa DT |
1508 | |
1509 | return error; | |
1510 | } | |
1511 | ||
1512 | /** | |
1513 | * gfs2_glock_dq_m - release multiple glocks | |
1514 | * @num_gh: the number of structures | |
1515 | * @ghs: an array of struct gfs2_holder structures | |
1516 | * | |
1517 | */ | |
1518 | ||
1519 | void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1520 | { | |
fa1bbdea BP |
1521 | while (num_gh--) |
1522 | gfs2_glock_dq(&ghs[num_gh]); | |
b3b94faa DT |
1523 | } |
1524 | ||
f057f6cd | 1525 | void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state) |
da755fdb | 1526 | { |
c4f68a13 BM |
1527 | unsigned long delay = 0; |
1528 | unsigned long holdtime; | |
1529 | unsigned long now = jiffies; | |
b3b94faa | 1530 | |
f057f6cd | 1531 | gfs2_glock_hold(gl); |
7cf8dcd3 BP |
1532 | holdtime = gl->gl_tchange + gl->gl_hold_time; |
1533 | if (test_bit(GLF_QUEUED, &gl->gl_flags) && | |
1534 | gl->gl_name.ln_type == LM_TYPE_INODE) { | |
7b5e3d5f SW |
1535 | if (time_before(now, holdtime)) |
1536 | delay = holdtime - now; | |
1537 | if (test_bit(GLF_REPLY_PENDING, &gl->gl_flags)) | |
7cf8dcd3 | 1538 | delay = gl->gl_hold_time; |
7b5e3d5f | 1539 | } |
b3b94faa | 1540 | |
f3dd1649 | 1541 | spin_lock(&gl->gl_lockref.lock); |
81ffbf65 | 1542 | handle_callback(gl, state, delay, true); |
6b0c7440 | 1543 | __gfs2_glock_queue_work(gl, delay); |
f3dd1649 | 1544 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa DT |
1545 | } |
1546 | ||
0809f6ec SW |
1547 | /** |
1548 | * gfs2_should_freeze - Figure out if glock should be frozen | |
1549 | * @gl: The glock in question | |
1550 | * | |
1551 | * Glocks are not frozen if (a) the result of the dlm operation is | |
1552 | * an error, (b) the locking operation was an unlock operation or | |
1553 | * (c) if there is a "noexp" flagged request anywhere in the queue | |
1554 | * | |
1555 | * Returns: 1 if freezing should occur, 0 otherwise | |
1556 | */ | |
1557 | ||
1558 | static int gfs2_should_freeze(const struct gfs2_glock *gl) | |
1559 | { | |
1560 | const struct gfs2_holder *gh; | |
1561 | ||
1562 | if (gl->gl_reply & ~LM_OUT_ST_MASK) | |
1563 | return 0; | |
1564 | if (gl->gl_target == LM_ST_UNLOCKED) | |
1565 | return 0; | |
1566 | ||
1567 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
1568 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
1569 | continue; | |
1570 | if (LM_FLAG_NOEXP & gh->gh_flags) | |
1571 | return 0; | |
1572 | } | |
1573 | ||
1574 | return 1; | |
1575 | } | |
1576 | ||
b3b94faa | 1577 | /** |
f057f6cd SW |
1578 | * gfs2_glock_complete - Callback used by locking |
1579 | * @gl: Pointer to the glock | |
1580 | * @ret: The return value from the dlm | |
b3b94faa | 1581 | * |
f3dd1649 | 1582 | * The gl_reply field is under the gl_lockref.lock lock so that it is ok |
47a25380 | 1583 | * to use a bitfield shared with other glock state fields. |
b3b94faa DT |
1584 | */ |
1585 | ||
f057f6cd | 1586 | void gfs2_glock_complete(struct gfs2_glock *gl, int ret) |
b3b94faa | 1587 | { |
15562c43 | 1588 | struct lm_lockstruct *ls = &gl->gl_name.ln_sbd->sd_lockstruct; |
0809f6ec | 1589 | |
f3dd1649 | 1590 | spin_lock(&gl->gl_lockref.lock); |
f057f6cd | 1591 | gl->gl_reply = ret; |
0809f6ec | 1592 | |
e0c2a9aa | 1593 | if (unlikely(test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))) { |
0809f6ec | 1594 | if (gfs2_should_freeze(gl)) { |
f057f6cd | 1595 | set_bit(GLF_FROZEN, &gl->gl_flags); |
f3dd1649 | 1596 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa | 1597 | return; |
0809f6ec | 1598 | } |
b3b94faa | 1599 | } |
47a25380 | 1600 | |
e66cf161 | 1601 | gl->gl_lockref.count++; |
f057f6cd | 1602 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
6b0c7440 | 1603 | __gfs2_glock_queue_work(gl, 0); |
f3dd1649 | 1604 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa DT |
1605 | } |
1606 | ||
4506a519 SW |
1607 | static int glock_cmp(void *priv, struct list_head *a, struct list_head *b) |
1608 | { | |
1609 | struct gfs2_glock *gla, *glb; | |
1610 | ||
1611 | gla = list_entry(a, struct gfs2_glock, gl_lru); | |
1612 | glb = list_entry(b, struct gfs2_glock, gl_lru); | |
1613 | ||
1614 | if (gla->gl_name.ln_number > glb->gl_name.ln_number) | |
1615 | return 1; | |
1616 | if (gla->gl_name.ln_number < glb->gl_name.ln_number) | |
1617 | return -1; | |
1618 | ||
1619 | return 0; | |
1620 | } | |
1621 | ||
1622 | /** | |
1623 | * gfs2_dispose_glock_lru - Demote a list of glocks | |
1624 | * @list: The list to dispose of | |
1625 | * | |
1626 | * Disposing of glocks may involve disk accesses, so that here we sort | |
1627 | * the glocks by number (i.e. disk location of the inodes) so that if | |
1628 | * there are any such accesses, they'll be sent in order (mostly). | |
1629 | * | |
1630 | * Must be called under the lru_lock, but may drop and retake this | |
1631 | * lock. While the lru_lock is dropped, entries may vanish from the | |
1632 | * list, but no new entries will appear on the list (since it is | |
1633 | * private) | |
1634 | */ | |
1635 | ||
1636 | static void gfs2_dispose_glock_lru(struct list_head *list) | |
1637 | __releases(&lru_lock) | |
1638 | __acquires(&lru_lock) | |
1639 | { | |
1640 | struct gfs2_glock *gl; | |
1641 | ||
1642 | list_sort(NULL, list, glock_cmp); | |
1643 | ||
1644 | while(!list_empty(list)) { | |
1645 | gl = list_entry(list->next, struct gfs2_glock, gl_lru); | |
1646 | list_del_init(&gl->gl_lru); | |
f3dd1649 | 1647 | if (!spin_trylock(&gl->gl_lockref.lock)) { |
94a09a39 | 1648 | add_back_to_lru: |
e66cf161 | 1649 | list_add(&gl->gl_lru, &lru_list); |
7881ef3f | 1650 | set_bit(GLF_LRU, &gl->gl_flags); |
e66cf161 SW |
1651 | atomic_inc(&lru_count); |
1652 | continue; | |
1653 | } | |
94a09a39 | 1654 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) { |
f3dd1649 | 1655 | spin_unlock(&gl->gl_lockref.lock); |
94a09a39 SW |
1656 | goto add_back_to_lru; |
1657 | } | |
e66cf161 | 1658 | gl->gl_lockref.count++; |
4506a519 | 1659 | if (demote_ok(gl)) |
81ffbf65 | 1660 | handle_callback(gl, LM_ST_UNLOCKED, 0, false); |
4506a519 | 1661 | WARN_ON(!test_and_clear_bit(GLF_LOCK, &gl->gl_flags)); |
6b0c7440 | 1662 | __gfs2_glock_queue_work(gl, 0); |
f3dd1649 | 1663 | spin_unlock(&gl->gl_lockref.lock); |
94a09a39 | 1664 | cond_resched_lock(&lru_lock); |
4506a519 SW |
1665 | } |
1666 | } | |
1667 | ||
2a005855 SW |
1668 | /** |
1669 | * gfs2_scan_glock_lru - Scan the LRU looking for locks to demote | |
1670 | * @nr: The number of entries to scan | |
1671 | * | |
4506a519 SW |
1672 | * This function selects the entries on the LRU which are able to |
1673 | * be demoted, and then kicks off the process by calling | |
1674 | * gfs2_dispose_glock_lru() above. | |
2a005855 | 1675 | */ |
b3b94faa | 1676 | |
1ab6c499 | 1677 | static long gfs2_scan_glock_lru(int nr) |
b3b94faa DT |
1678 | { |
1679 | struct gfs2_glock *gl; | |
97cc1025 | 1680 | LIST_HEAD(skipped); |
4506a519 | 1681 | LIST_HEAD(dispose); |
1ab6c499 | 1682 | long freed = 0; |
b3b94faa | 1683 | |
97cc1025 | 1684 | spin_lock(&lru_lock); |
1ab6c499 | 1685 | while ((nr-- >= 0) && !list_empty(&lru_list)) { |
97cc1025 | 1686 | gl = list_entry(lru_list.next, struct gfs2_glock, gl_lru); |
97cc1025 SW |
1687 | |
1688 | /* Test for being demotable */ | |
94a09a39 | 1689 | if (!test_bit(GLF_LOCK, &gl->gl_flags)) { |
4506a519 SW |
1690 | list_move(&gl->gl_lru, &dispose); |
1691 | atomic_dec(&lru_count); | |
7881ef3f | 1692 | clear_bit(GLF_LRU, &gl->gl_flags); |
1ab6c499 | 1693 | freed++; |
2163b1e6 | 1694 | continue; |
97cc1025 | 1695 | } |
4506a519 SW |
1696 | |
1697 | list_move(&gl->gl_lru, &skipped); | |
b3b94faa | 1698 | } |
97cc1025 | 1699 | list_splice(&skipped, &lru_list); |
4506a519 SW |
1700 | if (!list_empty(&dispose)) |
1701 | gfs2_dispose_glock_lru(&dispose); | |
97cc1025 | 1702 | spin_unlock(&lru_lock); |
1ab6c499 DC |
1703 | |
1704 | return freed; | |
2a005855 SW |
1705 | } |
1706 | ||
1ab6c499 DC |
1707 | static unsigned long gfs2_glock_shrink_scan(struct shrinker *shrink, |
1708 | struct shrink_control *sc) | |
2a005855 | 1709 | { |
1ab6c499 DC |
1710 | if (!(sc->gfp_mask & __GFP_FS)) |
1711 | return SHRINK_STOP; | |
1712 | return gfs2_scan_glock_lru(sc->nr_to_scan); | |
1713 | } | |
2a005855 | 1714 | |
1ab6c499 DC |
1715 | static unsigned long gfs2_glock_shrink_count(struct shrinker *shrink, |
1716 | struct shrink_control *sc) | |
1717 | { | |
55f841ce | 1718 | return vfs_pressure_ratio(atomic_read(&lru_count)); |
b3b94faa DT |
1719 | } |
1720 | ||
97cc1025 | 1721 | static struct shrinker glock_shrinker = { |
97cc1025 | 1722 | .seeks = DEFAULT_SEEKS, |
1ab6c499 DC |
1723 | .count_objects = gfs2_glock_shrink_count, |
1724 | .scan_objects = gfs2_glock_shrink_scan, | |
97cc1025 SW |
1725 | }; |
1726 | ||
b3b94faa DT |
1727 | /** |
1728 | * examine_bucket - Call a function for glock in a hash bucket | |
1729 | * @examiner: the function | |
1730 | * @sdp: the filesystem | |
1731 | * @bucket: the bucket | |
1732 | * | |
98687f42 HX |
1733 | * Note that the function can be called multiple times on the same |
1734 | * object. So the user must ensure that the function can cope with | |
1735 | * that. | |
b3b94faa DT |
1736 | */ |
1737 | ||
88ffbf3e | 1738 | static void glock_hash_walk(glock_examiner examiner, const struct gfs2_sbd *sdp) |
b3b94faa | 1739 | { |
bc015cb8 | 1740 | struct gfs2_glock *gl; |
98687f42 HX |
1741 | struct rhashtable_iter iter; |
1742 | ||
1743 | rhashtable_walk_enter(&gl_hash_table, &iter); | |
1744 | ||
1745 | do { | |
97a6ec4a | 1746 | rhashtable_walk_start(&iter); |
98687f42 HX |
1747 | |
1748 | while ((gl = rhashtable_walk_next(&iter)) && !IS_ERR(gl)) | |
27c3b415 | 1749 | if (gl->gl_name.ln_sbd == sdp && |
88ffbf3e BP |
1750 | lockref_get_not_dead(&gl->gl_lockref)) |
1751 | examiner(gl); | |
98687f42 HX |
1752 | |
1753 | rhashtable_walk_stop(&iter); | |
1754 | } while (cond_resched(), gl == ERR_PTR(-EAGAIN)); | |
1755 | ||
1756 | rhashtable_walk_exit(&iter); | |
bc015cb8 SW |
1757 | } |
1758 | ||
f057f6cd SW |
1759 | /** |
1760 | * thaw_glock - thaw out a glock which has an unprocessed reply waiting | |
1761 | * @gl: The glock to thaw | |
1762 | * | |
f057f6cd SW |
1763 | */ |
1764 | ||
1765 | static void thaw_glock(struct gfs2_glock *gl) | |
1766 | { | |
6b0c7440 | 1767 | if (!test_and_clear_bit(GLF_FROZEN, &gl->gl_flags)) { |
f057f6cd | 1768 | gfs2_glock_put(gl); |
6b0c7440 | 1769 | return; |
7286b31e | 1770 | } |
6b0c7440 AG |
1771 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
1772 | gfs2_glock_queue_work(gl, 0); | |
f057f6cd SW |
1773 | } |
1774 | ||
b3b94faa DT |
1775 | /** |
1776 | * clear_glock - look at a glock and see if we can free it from glock cache | |
1777 | * @gl: the glock to look at | |
1778 | * | |
1779 | */ | |
1780 | ||
1781 | static void clear_glock(struct gfs2_glock *gl) | |
1782 | { | |
f42ab085 | 1783 | gfs2_glock_remove_from_lru(gl); |
b3b94faa | 1784 | |
f3dd1649 | 1785 | spin_lock(&gl->gl_lockref.lock); |
c741c455 | 1786 | if (gl->gl_state != LM_ST_UNLOCKED) |
81ffbf65 | 1787 | handle_callback(gl, LM_ST_UNLOCKED, 0, false); |
6b0c7440 | 1788 | __gfs2_glock_queue_work(gl, 0); |
f3dd1649 | 1789 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa DT |
1790 | } |
1791 | ||
f057f6cd SW |
1792 | /** |
1793 | * gfs2_glock_thaw - Thaw any frozen glocks | |
1794 | * @sdp: The super block | |
1795 | * | |
1796 | */ | |
1797 | ||
1798 | void gfs2_glock_thaw(struct gfs2_sbd *sdp) | |
1799 | { | |
bc015cb8 SW |
1800 | glock_hash_walk(thaw_glock, sdp); |
1801 | } | |
f057f6cd | 1802 | |
3792ce97 | 1803 | static void dump_glock(struct seq_file *seq, struct gfs2_glock *gl, bool fsid) |
bc015cb8 | 1804 | { |
f3dd1649 | 1805 | spin_lock(&gl->gl_lockref.lock); |
3792ce97 | 1806 | gfs2_dump_glock(seq, gl, fsid); |
f3dd1649 | 1807 | spin_unlock(&gl->gl_lockref.lock); |
bc015cb8 SW |
1808 | } |
1809 | ||
1810 | static void dump_glock_func(struct gfs2_glock *gl) | |
1811 | { | |
3792ce97 | 1812 | dump_glock(NULL, gl, true); |
f057f6cd SW |
1813 | } |
1814 | ||
b3b94faa DT |
1815 | /** |
1816 | * gfs2_gl_hash_clear - Empty out the glock hash table | |
1817 | * @sdp: the filesystem | |
1818 | * @wait: wait until it's all gone | |
1819 | * | |
1bdad606 | 1820 | * Called when unmounting the filesystem. |
b3b94faa DT |
1821 | */ |
1822 | ||
fefc03bf | 1823 | void gfs2_gl_hash_clear(struct gfs2_sbd *sdp) |
b3b94faa | 1824 | { |
fb6791d1 | 1825 | set_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags); |
222cb538 | 1826 | flush_workqueue(glock_workqueue); |
bc015cb8 | 1827 | glock_hash_walk(clear_glock, sdp); |
8f05228e | 1828 | flush_workqueue(glock_workqueue); |
2aba1b5b BP |
1829 | wait_event_timeout(sdp->sd_glock_wait, |
1830 | atomic_read(&sdp->sd_glock_disposal) == 0, | |
1831 | HZ * 600); | |
bc015cb8 | 1832 | glock_hash_walk(dump_glock_func, sdp); |
b3b94faa DT |
1833 | } |
1834 | ||
813e0c46 SW |
1835 | void gfs2_glock_finish_truncate(struct gfs2_inode *ip) |
1836 | { | |
1837 | struct gfs2_glock *gl = ip->i_gl; | |
1838 | int ret; | |
1839 | ||
1840 | ret = gfs2_truncatei_resume(ip); | |
15562c43 | 1841 | gfs2_assert_withdraw(gl->gl_name.ln_sbd, ret == 0); |
813e0c46 | 1842 | |
f3dd1649 | 1843 | spin_lock(&gl->gl_lockref.lock); |
813e0c46 SW |
1844 | clear_bit(GLF_LOCK, &gl->gl_flags); |
1845 | run_queue(gl, 1); | |
f3dd1649 | 1846 | spin_unlock(&gl->gl_lockref.lock); |
813e0c46 SW |
1847 | } |
1848 | ||
6802e340 | 1849 | static const char *state2str(unsigned state) |
04b933f2 | 1850 | { |
6802e340 SW |
1851 | switch(state) { |
1852 | case LM_ST_UNLOCKED: | |
1853 | return "UN"; | |
1854 | case LM_ST_SHARED: | |
1855 | return "SH"; | |
1856 | case LM_ST_DEFERRED: | |
1857 | return "DF"; | |
1858 | case LM_ST_EXCLUSIVE: | |
1859 | return "EX"; | |
1860 | } | |
1861 | return "??"; | |
1862 | } | |
1863 | ||
b58bf407 | 1864 | static const char *hflags2str(char *buf, u16 flags, unsigned long iflags) |
6802e340 SW |
1865 | { |
1866 | char *p = buf; | |
1867 | if (flags & LM_FLAG_TRY) | |
1868 | *p++ = 't'; | |
1869 | if (flags & LM_FLAG_TRY_1CB) | |
1870 | *p++ = 'T'; | |
1871 | if (flags & LM_FLAG_NOEXP) | |
1872 | *p++ = 'e'; | |
1873 | if (flags & LM_FLAG_ANY) | |
f057f6cd | 1874 | *p++ = 'A'; |
6802e340 SW |
1875 | if (flags & LM_FLAG_PRIORITY) |
1876 | *p++ = 'p'; | |
1877 | if (flags & GL_ASYNC) | |
1878 | *p++ = 'a'; | |
1879 | if (flags & GL_EXACT) | |
1880 | *p++ = 'E'; | |
6802e340 SW |
1881 | if (flags & GL_NOCACHE) |
1882 | *p++ = 'c'; | |
1883 | if (test_bit(HIF_HOLDER, &iflags)) | |
1884 | *p++ = 'H'; | |
1885 | if (test_bit(HIF_WAIT, &iflags)) | |
1886 | *p++ = 'W'; | |
1887 | if (test_bit(HIF_FIRST, &iflags)) | |
1888 | *p++ = 'F'; | |
1889 | *p = 0; | |
1890 | return buf; | |
04b933f2 RP |
1891 | } |
1892 | ||
b3b94faa DT |
1893 | /** |
1894 | * dump_holder - print information about a glock holder | |
6802e340 | 1895 | * @seq: the seq_file struct |
b3b94faa | 1896 | * @gh: the glock holder |
3792ce97 | 1897 | * @fs_id_buf: pointer to file system id (if requested) |
b3b94faa | 1898 | * |
b3b94faa DT |
1899 | */ |
1900 | ||
3792ce97 BP |
1901 | static void dump_holder(struct seq_file *seq, const struct gfs2_holder *gh, |
1902 | const char *fs_id_buf) | |
b3b94faa | 1903 | { |
6802e340 | 1904 | struct task_struct *gh_owner = NULL; |
6802e340 | 1905 | char flags_buf[32]; |
b3b94faa | 1906 | |
0b3a2c99 | 1907 | rcu_read_lock(); |
6802e340 | 1908 | if (gh->gh_owner_pid) |
b1e058da | 1909 | gh_owner = pid_task(gh->gh_owner_pid, PIDTYPE_PID); |
3792ce97 BP |
1910 | gfs2_print_dbg(seq, "%s H: s:%s f:%s e:%d p:%ld [%s] %pS\n", |
1911 | fs_id_buf, state2str(gh->gh_state), | |
cc18152e JP |
1912 | hflags2str(flags_buf, gh->gh_flags, gh->gh_iflags), |
1913 | gh->gh_error, | |
1914 | gh->gh_owner_pid ? (long)pid_nr(gh->gh_owner_pid) : -1, | |
1915 | gh_owner ? gh_owner->comm : "(ended)", | |
1916 | (void *)gh->gh_ip); | |
0b3a2c99 | 1917 | rcu_read_unlock(); |
b3b94faa DT |
1918 | } |
1919 | ||
627c10b7 | 1920 | static const char *gflags2str(char *buf, const struct gfs2_glock *gl) |
6802e340 | 1921 | { |
627c10b7 | 1922 | const unsigned long *gflags = &gl->gl_flags; |
6802e340 | 1923 | char *p = buf; |
627c10b7 | 1924 | |
6802e340 SW |
1925 | if (test_bit(GLF_LOCK, gflags)) |
1926 | *p++ = 'l'; | |
6802e340 SW |
1927 | if (test_bit(GLF_DEMOTE, gflags)) |
1928 | *p++ = 'D'; | |
1929 | if (test_bit(GLF_PENDING_DEMOTE, gflags)) | |
1930 | *p++ = 'd'; | |
1931 | if (test_bit(GLF_DEMOTE_IN_PROGRESS, gflags)) | |
1932 | *p++ = 'p'; | |
1933 | if (test_bit(GLF_DIRTY, gflags)) | |
1934 | *p++ = 'y'; | |
1935 | if (test_bit(GLF_LFLUSH, gflags)) | |
1936 | *p++ = 'f'; | |
1937 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, gflags)) | |
1938 | *p++ = 'i'; | |
1939 | if (test_bit(GLF_REPLY_PENDING, gflags)) | |
1940 | *p++ = 'r'; | |
f057f6cd | 1941 | if (test_bit(GLF_INITIAL, gflags)) |
d8348de0 | 1942 | *p++ = 'I'; |
f057f6cd SW |
1943 | if (test_bit(GLF_FROZEN, gflags)) |
1944 | *p++ = 'F'; | |
7b5e3d5f SW |
1945 | if (test_bit(GLF_QUEUED, gflags)) |
1946 | *p++ = 'q'; | |
627c10b7 SW |
1947 | if (test_bit(GLF_LRU, gflags)) |
1948 | *p++ = 'L'; | |
1949 | if (gl->gl_object) | |
1950 | *p++ = 'o'; | |
a245769f SW |
1951 | if (test_bit(GLF_BLOCKING, gflags)) |
1952 | *p++ = 'b'; | |
6802e340 SW |
1953 | *p = 0; |
1954 | return buf; | |
b3b94faa DT |
1955 | } |
1956 | ||
1957 | /** | |
8eae1ca0 | 1958 | * gfs2_dump_glock - print information about a glock |
6802e340 | 1959 | * @seq: The seq_file struct |
b3b94faa | 1960 | * @gl: the glock |
3792ce97 | 1961 | * @fsid: If true, also dump the file system id |
6802e340 SW |
1962 | * |
1963 | * The file format is as follows: | |
1964 | * One line per object, capital letters are used to indicate objects | |
1965 | * G = glock, I = Inode, R = rgrp, H = holder. Glocks are not indented, | |
1966 | * other objects are indented by a single space and follow the glock to | |
1967 | * which they are related. Fields are indicated by lower case letters | |
1968 | * followed by a colon and the field value, except for strings which are in | |
1969 | * [] so that its possible to see if they are composed of spaces for | |
1970 | * example. The field's are n = number (id of the object), f = flags, | |
1971 | * t = type, s = state, r = refcount, e = error, p = pid. | |
b3b94faa | 1972 | * |
b3b94faa DT |
1973 | */ |
1974 | ||
3792ce97 | 1975 | void gfs2_dump_glock(struct seq_file *seq, struct gfs2_glock *gl, bool fsid) |
b3b94faa | 1976 | { |
6802e340 SW |
1977 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
1978 | unsigned long long dtime; | |
1979 | const struct gfs2_holder *gh; | |
1980 | char gflags_buf[32]; | |
3792ce97 | 1981 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
98fb0574 | 1982 | char fs_id_buf[sizeof(sdp->sd_fsname) + 7]; |
b3b94faa | 1983 | |
3792ce97 BP |
1984 | memset(fs_id_buf, 0, sizeof(fs_id_buf)); |
1985 | if (fsid && sdp) /* safety precaution */ | |
1986 | sprintf(fs_id_buf, "fsid=%s: ", sdp->sd_fsname); | |
6802e340 SW |
1987 | dtime = jiffies - gl->gl_demote_time; |
1988 | dtime *= 1000000/HZ; /* demote time in uSec */ | |
1989 | if (!test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
1990 | dtime = 0; | |
3792ce97 BP |
1991 | gfs2_print_dbg(seq, "%sG: s:%s n:%u/%llx f:%s t:%s d:%s/%llu a:%d " |
1992 | "v:%d r:%d m:%ld\n", fs_id_buf, state2str(gl->gl_state), | |
6802e340 SW |
1993 | gl->gl_name.ln_type, |
1994 | (unsigned long long)gl->gl_name.ln_number, | |
627c10b7 | 1995 | gflags2str(gflags_buf, gl), |
6802e340 SW |
1996 | state2str(gl->gl_target), |
1997 | state2str(gl->gl_demote_state), dtime, | |
6802e340 | 1998 | atomic_read(&gl->gl_ail_count), |
638803d4 | 1999 | atomic_read(&gl->gl_revokes), |
e66cf161 | 2000 | (int)gl->gl_lockref.count, gl->gl_hold_time); |
b3b94faa | 2001 | |
ac3beb6a | 2002 | list_for_each_entry(gh, &gl->gl_holders, gh_list) |
3792ce97 | 2003 | dump_holder(seq, gh, fs_id_buf); |
ac3beb6a | 2004 | |
6802e340 | 2005 | if (gl->gl_state != LM_ST_UNLOCKED && glops->go_dump) |
3792ce97 | 2006 | glops->go_dump(seq, gl, fs_id_buf); |
b3b94faa DT |
2007 | } |
2008 | ||
a245769f SW |
2009 | static int gfs2_glstats_seq_show(struct seq_file *seq, void *iter_ptr) |
2010 | { | |
2011 | struct gfs2_glock *gl = iter_ptr; | |
2012 | ||
4d207133 | 2013 | seq_printf(seq, "G: n:%u/%llx rtt:%llu/%llu rttb:%llu/%llu irt:%llu/%llu dcnt: %llu qcnt: %llu\n", |
a245769f SW |
2014 | gl->gl_name.ln_type, |
2015 | (unsigned long long)gl->gl_name.ln_number, | |
4d207133 BH |
2016 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTT], |
2017 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTVAR], | |
2018 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTB], | |
2019 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTVARB], | |
2020 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SIRT], | |
2021 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SIRTVAR], | |
2022 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_DCOUNT], | |
2023 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_QCOUNT]); | |
a245769f SW |
2024 | return 0; |
2025 | } | |
2026 | ||
2027 | static const char *gfs2_gltype[] = { | |
2028 | "type", | |
2029 | "reserved", | |
2030 | "nondisk", | |
2031 | "inode", | |
2032 | "rgrp", | |
2033 | "meta", | |
2034 | "iopen", | |
2035 | "flock", | |
2036 | "plock", | |
2037 | "quota", | |
2038 | "journal", | |
2039 | }; | |
2040 | ||
2041 | static const char *gfs2_stype[] = { | |
2042 | [GFS2_LKS_SRTT] = "srtt", | |
2043 | [GFS2_LKS_SRTTVAR] = "srttvar", | |
2044 | [GFS2_LKS_SRTTB] = "srttb", | |
2045 | [GFS2_LKS_SRTTVARB] = "srttvarb", | |
2046 | [GFS2_LKS_SIRT] = "sirt", | |
2047 | [GFS2_LKS_SIRTVAR] = "sirtvar", | |
2048 | [GFS2_LKS_DCOUNT] = "dlm", | |
2049 | [GFS2_LKS_QCOUNT] = "queue", | |
2050 | }; | |
2051 | ||
2052 | #define GFS2_NR_SBSTATS (ARRAY_SIZE(gfs2_gltype) * ARRAY_SIZE(gfs2_stype)) | |
2053 | ||
2054 | static int gfs2_sbstats_seq_show(struct seq_file *seq, void *iter_ptr) | |
2055 | { | |
81648d04 AG |
2056 | struct gfs2_sbd *sdp = seq->private; |
2057 | loff_t pos = *(loff_t *)iter_ptr; | |
2058 | unsigned index = pos >> 3; | |
2059 | unsigned subindex = pos & 0x07; | |
a245769f SW |
2060 | int i; |
2061 | ||
2062 | if (index == 0 && subindex != 0) | |
2063 | return 0; | |
6802e340 | 2064 | |
a245769f SW |
2065 | seq_printf(seq, "%-10s %8s:", gfs2_gltype[index], |
2066 | (index == 0) ? "cpu": gfs2_stype[subindex]); | |
b3b94faa | 2067 | |
a245769f SW |
2068 | for_each_possible_cpu(i) { |
2069 | const struct gfs2_pcpu_lkstats *lkstats = per_cpu_ptr(sdp->sd_lkstats, i); | |
8f7e0a80 AG |
2070 | |
2071 | if (index == 0) | |
2072 | seq_printf(seq, " %15u", i); | |
2073 | else | |
2074 | seq_printf(seq, " %15llu", (unsigned long long)lkstats-> | |
2075 | lkstats[index - 1].stats[subindex]); | |
a245769f SW |
2076 | } |
2077 | seq_putc(seq, '\n'); | |
2078 | return 0; | |
2079 | } | |
8fbbfd21 | 2080 | |
85d1da67 SW |
2081 | int __init gfs2_glock_init(void) |
2082 | { | |
0515480a | 2083 | int i, ret; |
88ffbf3e BP |
2084 | |
2085 | ret = rhashtable_init(&gl_hash_table, &ht_parms); | |
2086 | if (ret < 0) | |
2087 | return ret; | |
8fbbfd21 | 2088 | |
d2115778 | 2089 | glock_workqueue = alloc_workqueue("glock_workqueue", WQ_MEM_RECLAIM | |
58a69cb4 | 2090 | WQ_HIGHPRI | WQ_FREEZABLE, 0); |
88ffbf3e BP |
2091 | if (!glock_workqueue) { |
2092 | rhashtable_destroy(&gl_hash_table); | |
dfc4616d | 2093 | return -ENOMEM; |
88ffbf3e | 2094 | } |
d2115778 | 2095 | gfs2_delete_workqueue = alloc_workqueue("delete_workqueue", |
58a69cb4 | 2096 | WQ_MEM_RECLAIM | WQ_FREEZABLE, |
d2115778 | 2097 | 0); |
dfc4616d | 2098 | if (!gfs2_delete_workqueue) { |
b94a170e | 2099 | destroy_workqueue(glock_workqueue); |
88ffbf3e | 2100 | rhashtable_destroy(&gl_hash_table); |
dfc4616d | 2101 | return -ENOMEM; |
b94a170e | 2102 | } |
97cc1025 | 2103 | |
e0d735c1 CY |
2104 | ret = register_shrinker(&glock_shrinker); |
2105 | if (ret) { | |
2106 | destroy_workqueue(gfs2_delete_workqueue); | |
2107 | destroy_workqueue(glock_workqueue); | |
2108 | rhashtable_destroy(&gl_hash_table); | |
2109 | return ret; | |
2110 | } | |
c4f68a13 | 2111 | |
0515480a AG |
2112 | for (i = 0; i < GLOCK_WAIT_TABLE_SIZE; i++) |
2113 | init_waitqueue_head(glock_wait_table + i); | |
2114 | ||
85d1da67 SW |
2115 | return 0; |
2116 | } | |
2117 | ||
8fbbfd21 SW |
2118 | void gfs2_glock_exit(void) |
2119 | { | |
97cc1025 | 2120 | unregister_shrinker(&glock_shrinker); |
88ffbf3e | 2121 | rhashtable_destroy(&gl_hash_table); |
c4f68a13 | 2122 | destroy_workqueue(glock_workqueue); |
b94a170e | 2123 | destroy_workqueue(gfs2_delete_workqueue); |
8fbbfd21 SW |
2124 | } |
2125 | ||
7ac07fda | 2126 | static void gfs2_glock_iter_next(struct gfs2_glock_iter *gi, loff_t n) |
bc015cb8 | 2127 | { |
3fd5d3ad AG |
2128 | struct gfs2_glock *gl = gi->gl; |
2129 | ||
2130 | if (gl) { | |
2131 | if (n == 0) | |
2132 | return; | |
2133 | if (!lockref_put_not_zero(&gl->gl_lockref)) | |
2134 | gfs2_glock_queue_put(gl); | |
7ac07fda AG |
2135 | } |
2136 | for (;;) { | |
3fd5d3ad AG |
2137 | gl = rhashtable_walk_next(&gi->hti); |
2138 | if (IS_ERR_OR_NULL(gl)) { | |
2139 | if (gl == ERR_PTR(-EAGAIN)) { | |
2140 | n = 1; | |
2141 | continue; | |
7ac07fda | 2142 | } |
3fd5d3ad AG |
2143 | gl = NULL; |
2144 | break; | |
2145 | } | |
2146 | if (gl->gl_name.ln_sbd != gi->sdp) | |
2147 | continue; | |
2148 | if (n <= 1) { | |
2149 | if (!lockref_get_not_dead(&gl->gl_lockref)) | |
2150 | continue; | |
2151 | break; | |
2152 | } else { | |
2153 | if (__lockref_is_dead(&gl->gl_lockref)) | |
2154 | continue; | |
2155 | n--; | |
bc015cb8 | 2156 | } |
14d37564 | 2157 | } |
3fd5d3ad | 2158 | gi->gl = gl; |
7c52b166 RP |
2159 | } |
2160 | ||
6802e340 | 2161 | static void *gfs2_glock_seq_start(struct seq_file *seq, loff_t *pos) |
27c3b415 | 2162 | __acquires(RCU) |
7c52b166 | 2163 | { |
6802e340 | 2164 | struct gfs2_glock_iter *gi = seq->private; |
7ac07fda | 2165 | loff_t n; |
ba1ddcb6 | 2166 | |
7ac07fda AG |
2167 | /* |
2168 | * We can either stay where we are, skip to the next hash table | |
2169 | * entry, or start from the beginning. | |
2170 | */ | |
2171 | if (*pos < gi->last_pos) { | |
2172 | rhashtable_walk_exit(&gi->hti); | |
2173 | rhashtable_walk_enter(&gl_hash_table, &gi->hti); | |
2174 | n = *pos + 1; | |
2175 | } else { | |
2176 | n = *pos - gi->last_pos; | |
2177 | } | |
7c52b166 | 2178 | |
7ac07fda | 2179 | rhashtable_walk_start(&gi->hti); |
7c52b166 | 2180 | |
7ac07fda | 2181 | gfs2_glock_iter_next(gi, n); |
ba1ddcb6 | 2182 | gi->last_pos = *pos; |
6802e340 | 2183 | return gi->gl; |
7c52b166 RP |
2184 | } |
2185 | ||
6802e340 | 2186 | static void *gfs2_glock_seq_next(struct seq_file *seq, void *iter_ptr, |
7c52b166 RP |
2187 | loff_t *pos) |
2188 | { | |
6802e340 | 2189 | struct gfs2_glock_iter *gi = seq->private; |
7c52b166 RP |
2190 | |
2191 | (*pos)++; | |
ba1ddcb6 | 2192 | gi->last_pos = *pos; |
7ac07fda | 2193 | gfs2_glock_iter_next(gi, 1); |
6802e340 | 2194 | return gi->gl; |
7c52b166 RP |
2195 | } |
2196 | ||
6802e340 | 2197 | static void gfs2_glock_seq_stop(struct seq_file *seq, void *iter_ptr) |
27c3b415 | 2198 | __releases(RCU) |
7c52b166 | 2199 | { |
6802e340 | 2200 | struct gfs2_glock_iter *gi = seq->private; |
bc015cb8 | 2201 | |
88ffbf3e | 2202 | rhashtable_walk_stop(&gi->hti); |
7c52b166 RP |
2203 | } |
2204 | ||
6802e340 | 2205 | static int gfs2_glock_seq_show(struct seq_file *seq, void *iter_ptr) |
7c52b166 | 2206 | { |
3792ce97 | 2207 | dump_glock(seq, iter_ptr, false); |
ac3beb6a | 2208 | return 0; |
7c52b166 RP |
2209 | } |
2210 | ||
a245769f SW |
2211 | static void *gfs2_sbstats_seq_start(struct seq_file *seq, loff_t *pos) |
2212 | { | |
81648d04 | 2213 | preempt_disable(); |
a245769f SW |
2214 | if (*pos >= GFS2_NR_SBSTATS) |
2215 | return NULL; | |
81648d04 | 2216 | return pos; |
a245769f SW |
2217 | } |
2218 | ||
2219 | static void *gfs2_sbstats_seq_next(struct seq_file *seq, void *iter_ptr, | |
2220 | loff_t *pos) | |
2221 | { | |
a245769f | 2222 | (*pos)++; |
81648d04 | 2223 | if (*pos >= GFS2_NR_SBSTATS) |
a245769f | 2224 | return NULL; |
81648d04 | 2225 | return pos; |
a245769f SW |
2226 | } |
2227 | ||
2228 | static void gfs2_sbstats_seq_stop(struct seq_file *seq, void *iter_ptr) | |
2229 | { | |
2230 | preempt_enable(); | |
2231 | } | |
2232 | ||
4ef29002 | 2233 | static const struct seq_operations gfs2_glock_seq_ops = { |
7c52b166 RP |
2234 | .start = gfs2_glock_seq_start, |
2235 | .next = gfs2_glock_seq_next, | |
2236 | .stop = gfs2_glock_seq_stop, | |
2237 | .show = gfs2_glock_seq_show, | |
2238 | }; | |
2239 | ||
a245769f SW |
2240 | static const struct seq_operations gfs2_glstats_seq_ops = { |
2241 | .start = gfs2_glock_seq_start, | |
2242 | .next = gfs2_glock_seq_next, | |
2243 | .stop = gfs2_glock_seq_stop, | |
2244 | .show = gfs2_glstats_seq_show, | |
2245 | }; | |
2246 | ||
2247 | static const struct seq_operations gfs2_sbstats_seq_ops = { | |
2248 | .start = gfs2_sbstats_seq_start, | |
2249 | .next = gfs2_sbstats_seq_next, | |
2250 | .stop = gfs2_sbstats_seq_stop, | |
2251 | .show = gfs2_sbstats_seq_show, | |
2252 | }; | |
2253 | ||
0fe2f1e9 SW |
2254 | #define GFS2_SEQ_GOODSIZE min(PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER, 65536UL) |
2255 | ||
92ecd73a AG |
2256 | static int __gfs2_glocks_open(struct inode *inode, struct file *file, |
2257 | const struct seq_operations *ops) | |
7c52b166 | 2258 | { |
92ecd73a | 2259 | int ret = seq_open_private(file, ops, sizeof(struct gfs2_glock_iter)); |
6802e340 SW |
2260 | if (ret == 0) { |
2261 | struct seq_file *seq = file->private_data; | |
2262 | struct gfs2_glock_iter *gi = seq->private; | |
88ffbf3e | 2263 | |
6802e340 | 2264 | gi->sdp = inode->i_private; |
0fe2f1e9 | 2265 | seq->buf = kmalloc(GFS2_SEQ_GOODSIZE, GFP_KERNEL | __GFP_NOWARN); |
df5d2f55 | 2266 | if (seq->buf) |
0fe2f1e9 | 2267 | seq->size = GFS2_SEQ_GOODSIZE; |
7ac07fda AG |
2268 | /* |
2269 | * Initially, we are "before" the first hash table entry; the | |
2270 | * first call to rhashtable_walk_next gets us the first entry. | |
2271 | */ | |
2272 | gi->last_pos = -1; | |
88ffbf3e | 2273 | gi->gl = NULL; |
7ac07fda | 2274 | rhashtable_walk_enter(&gl_hash_table, &gi->hti); |
6802e340 SW |
2275 | } |
2276 | return ret; | |
7c52b166 RP |
2277 | } |
2278 | ||
92ecd73a AG |
2279 | static int gfs2_glocks_open(struct inode *inode, struct file *file) |
2280 | { | |
2281 | return __gfs2_glocks_open(inode, file, &gfs2_glock_seq_ops); | |
2282 | } | |
2283 | ||
88ffbf3e BP |
2284 | static int gfs2_glocks_release(struct inode *inode, struct file *file) |
2285 | { | |
2286 | struct seq_file *seq = file->private_data; | |
2287 | struct gfs2_glock_iter *gi = seq->private; | |
2288 | ||
3fd5d3ad AG |
2289 | if (gi->gl) |
2290 | gfs2_glock_put(gi->gl); | |
7ac07fda | 2291 | rhashtable_walk_exit(&gi->hti); |
88ffbf3e BP |
2292 | return seq_release_private(inode, file); |
2293 | } | |
2294 | ||
a245769f SW |
2295 | static int gfs2_glstats_open(struct inode *inode, struct file *file) |
2296 | { | |
92ecd73a | 2297 | return __gfs2_glocks_open(inode, file, &gfs2_glstats_seq_ops); |
a245769f SW |
2298 | } |
2299 | ||
2300 | static int gfs2_sbstats_open(struct inode *inode, struct file *file) | |
2301 | { | |
81648d04 | 2302 | int ret = seq_open(file, &gfs2_sbstats_seq_ops); |
a245769f SW |
2303 | if (ret == 0) { |
2304 | struct seq_file *seq = file->private_data; | |
81648d04 | 2305 | seq->private = inode->i_private; /* sdp */ |
a245769f SW |
2306 | } |
2307 | return ret; | |
2308 | } | |
2309 | ||
2310 | static const struct file_operations gfs2_glocks_fops = { | |
2311 | .owner = THIS_MODULE, | |
2312 | .open = gfs2_glocks_open, | |
2313 | .read = seq_read, | |
2314 | .llseek = seq_lseek, | |
88ffbf3e | 2315 | .release = gfs2_glocks_release, |
a245769f SW |
2316 | }; |
2317 | ||
2318 | static const struct file_operations gfs2_glstats_fops = { | |
7c52b166 | 2319 | .owner = THIS_MODULE, |
a245769f SW |
2320 | .open = gfs2_glstats_open, |
2321 | .read = seq_read, | |
2322 | .llseek = seq_lseek, | |
88ffbf3e | 2323 | .release = gfs2_glocks_release, |
a245769f SW |
2324 | }; |
2325 | ||
2326 | static const struct file_operations gfs2_sbstats_fops = { | |
2327 | .owner = THIS_MODULE, | |
2328 | .open = gfs2_sbstats_open, | |
7c52b166 RP |
2329 | .read = seq_read, |
2330 | .llseek = seq_lseek, | |
81648d04 | 2331 | .release = seq_release, |
7c52b166 RP |
2332 | }; |
2333 | ||
2abbf9a4 GKH |
2334 | void gfs2_create_debugfs_file(struct gfs2_sbd *sdp) |
2335 | { | |
2336 | sdp->debugfs_dir = debugfs_create_dir(sdp->sd_table_name, gfs2_root); | |
7c52b166 | 2337 | |
2abbf9a4 GKH |
2338 | debugfs_create_file("glocks", S_IFREG | S_IRUGO, sdp->debugfs_dir, sdp, |
2339 | &gfs2_glocks_fops); | |
2340 | ||
2341 | debugfs_create_file("glstats", S_IFREG | S_IRUGO, sdp->debugfs_dir, sdp, | |
2342 | &gfs2_glstats_fops); | |
2343 | ||
2344 | debugfs_create_file("sbstats", S_IFREG | S_IRUGO, sdp->debugfs_dir, sdp, | |
2345 | &gfs2_sbstats_fops); | |
7c52b166 RP |
2346 | } |
2347 | ||
2348 | void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp) | |
2349 | { | |
2abbf9a4 GKH |
2350 | debugfs_remove_recursive(sdp->debugfs_dir); |
2351 | sdp->debugfs_dir = NULL; | |
7c52b166 RP |
2352 | } |
2353 | ||
2abbf9a4 | 2354 | void gfs2_register_debugfs(void) |
7c52b166 RP |
2355 | { |
2356 | gfs2_root = debugfs_create_dir("gfs2", NULL); | |
7c52b166 RP |
2357 | } |
2358 | ||
2359 | void gfs2_unregister_debugfs(void) | |
2360 | { | |
2361 | debugfs_remove(gfs2_root); | |
5f882096 | 2362 | gfs2_root = NULL; |
7c52b166 | 2363 | } |