Commit | Line | Data |
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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 | |
15f2547b BP |
128 | kfree(gl->gl_lksb.sb_lvbptr); |
129 | if (gl->gl_ops->go_flags & GLOF_ASPACE) | |
bc015cb8 | 130 | kmem_cache_free(gfs2_glock_aspace_cachep, gl); |
15f2547b | 131 | else |
bc015cb8 | 132 | kmem_cache_free(gfs2_glock_cachep, gl); |
961ae1d8 AG |
133 | } |
134 | ||
a72d2401 BP |
135 | /** |
136 | * glock_blocked_by_withdraw - determine if we can still use a glock | |
137 | * @gl: the glock | |
138 | * | |
139 | * We need to allow some glocks to be enqueued, dequeued, promoted, and demoted | |
140 | * when we're withdrawn. For example, to maintain metadata integrity, we should | |
141 | * disallow the use of inode and rgrp glocks when withdrawn. Other glocks, like | |
142 | * iopen or the transaction glocks may be safely used because none of their | |
143 | * metadata goes through the journal. So in general, we should disallow all | |
144 | * glocks that are journaled, and allow all the others. One exception is: | |
145 | * we need to allow our active journal to be promoted and demoted so others | |
146 | * may recover it and we can reacquire it when they're done. | |
147 | */ | |
148 | static bool glock_blocked_by_withdraw(struct gfs2_glock *gl) | |
149 | { | |
150 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; | |
151 | ||
152 | if (likely(!gfs2_withdrawn(sdp))) | |
153 | return false; | |
154 | if (gl->gl_ops->go_flags & GLOF_NONDISK) | |
155 | return false; | |
156 | if (!sdp->sd_jdesc || | |
157 | gl->gl_name.ln_number == sdp->sd_jdesc->jd_no_addr) | |
158 | return false; | |
159 | return true; | |
160 | } | |
161 | ||
961ae1d8 AG |
162 | void gfs2_glock_free(struct gfs2_glock *gl) |
163 | { | |
164 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; | |
165 | ||
638803d4 | 166 | BUG_ON(atomic_read(&gl->gl_revokes)); |
0515480a AG |
167 | rhashtable_remove_fast(&gl_hash_table, &gl->gl_node, ht_parms); |
168 | smp_mb(); | |
169 | wake_up_glock(gl); | |
961ae1d8 | 170 | call_rcu(&gl->gl_rcu, gfs2_glock_dealloc); |
bc015cb8 SW |
171 | if (atomic_dec_and_test(&sdp->sd_glock_disposal)) |
172 | wake_up(&sdp->sd_glock_wait); | |
b3b94faa DT |
173 | } |
174 | ||
175 | /** | |
176 | * gfs2_glock_hold() - increment reference count on glock | |
177 | * @gl: The glock to hold | |
178 | * | |
179 | */ | |
180 | ||
71c1b213 | 181 | void gfs2_glock_hold(struct gfs2_glock *gl) |
b3b94faa | 182 | { |
e66cf161 SW |
183 | GLOCK_BUG_ON(gl, __lockref_is_dead(&gl->gl_lockref)); |
184 | lockref_get(&gl->gl_lockref); | |
b3b94faa DT |
185 | } |
186 | ||
8ff22a6f BM |
187 | /** |
188 | * demote_ok - Check to see if it's ok to unlock a glock | |
189 | * @gl: the glock | |
190 | * | |
191 | * Returns: 1 if it's ok | |
192 | */ | |
193 | ||
194 | static int demote_ok(const struct gfs2_glock *gl) | |
195 | { | |
196 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
197 | ||
198 | if (gl->gl_state == LM_ST_UNLOCKED) | |
199 | return 0; | |
f42ab085 | 200 | if (!list_empty(&gl->gl_holders)) |
8ff22a6f BM |
201 | return 0; |
202 | if (glops->go_demote_ok) | |
203 | return glops->go_demote_ok(gl); | |
204 | return 1; | |
205 | } | |
206 | ||
bc015cb8 | 207 | |
29687a2a SW |
208 | void gfs2_glock_add_to_lru(struct gfs2_glock *gl) |
209 | { | |
7881ef3f RL |
210 | if (!(gl->gl_ops->go_flags & GLOF_LRU)) |
211 | return; | |
212 | ||
29687a2a SW |
213 | spin_lock(&lru_lock); |
214 | ||
7881ef3f RL |
215 | list_del(&gl->gl_lru); |
216 | list_add_tail(&gl->gl_lru, &lru_list); | |
217 | ||
218 | if (!test_bit(GLF_LRU, &gl->gl_flags)) { | |
219 | set_bit(GLF_LRU, &gl->gl_flags); | |
29687a2a | 220 | atomic_inc(&lru_count); |
7881ef3f | 221 | } |
29687a2a | 222 | |
29687a2a SW |
223 | spin_unlock(&lru_lock); |
224 | } | |
225 | ||
8f6cb409 | 226 | static void gfs2_glock_remove_from_lru(struct gfs2_glock *gl) |
f42ab085 | 227 | { |
645ebd49 BP |
228 | if (!(gl->gl_ops->go_flags & GLOF_LRU)) |
229 | return; | |
230 | ||
8f6cb409 | 231 | spin_lock(&lru_lock); |
7881ef3f | 232 | if (test_bit(GLF_LRU, &gl->gl_flags)) { |
f42ab085 SW |
233 | list_del_init(&gl->gl_lru); |
234 | atomic_dec(&lru_count); | |
235 | clear_bit(GLF_LRU, &gl->gl_flags); | |
236 | } | |
237 | spin_unlock(&lru_lock); | |
238 | } | |
239 | ||
6b0c7440 AG |
240 | /* |
241 | * Enqueue the glock on the work queue. Passes one glock reference on to the | |
242 | * work queue. | |
b3b94faa | 243 | */ |
6b0c7440 AG |
244 | static void __gfs2_glock_queue_work(struct gfs2_glock *gl, unsigned long delay) { |
245 | if (!queue_delayed_work(glock_workqueue, &gl->gl_work, delay)) { | |
246 | /* | |
247 | * We are holding the lockref spinlock, and the work was still | |
248 | * queued above. The queued work (glock_work_func) takes that | |
249 | * spinlock before dropping its glock reference(s), so it | |
250 | * cannot have dropped them in the meantime. | |
251 | */ | |
252 | GLOCK_BUG_ON(gl, gl->gl_lockref.count < 2); | |
253 | gl->gl_lockref.count--; | |
254 | } | |
255 | } | |
b3b94faa | 256 | |
6b0c7440 AG |
257 | static void gfs2_glock_queue_work(struct gfs2_glock *gl, unsigned long delay) { |
258 | spin_lock(&gl->gl_lockref.lock); | |
259 | __gfs2_glock_queue_work(gl, delay); | |
260 | spin_unlock(&gl->gl_lockref.lock); | |
261 | } | |
262 | ||
263 | static void __gfs2_glock_put(struct gfs2_glock *gl) | |
b3b94faa | 264 | { |
15562c43 | 265 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
bc015cb8 | 266 | struct address_space *mapping = gfs2_glock2aspace(gl); |
b3b94faa | 267 | |
e66cf161 SW |
268 | lockref_mark_dead(&gl->gl_lockref); |
269 | ||
8f6cb409 | 270 | gfs2_glock_remove_from_lru(gl); |
e66cf161 | 271 | spin_unlock(&gl->gl_lockref.lock); |
e66cf161 | 272 | GLOCK_BUG_ON(gl, !list_empty(&gl->gl_holders)); |
601ef0d5 | 273 | GLOCK_BUG_ON(gl, mapping && mapping->nrpages && !gfs2_withdrawn(sdp)); |
e66cf161 SW |
274 | trace_gfs2_glock_put(gl); |
275 | sdp->sd_lockstruct.ls_ops->lm_put_lock(gl); | |
b3b94faa DT |
276 | } |
277 | ||
71c1b213 AG |
278 | /* |
279 | * Cause the glock to be put in work queue context. | |
280 | */ | |
281 | void gfs2_glock_queue_put(struct gfs2_glock *gl) | |
282 | { | |
283 | gfs2_glock_queue_work(gl, 0); | |
284 | } | |
285 | ||
6b0c7440 AG |
286 | /** |
287 | * gfs2_glock_put() - Decrement reference count on glock | |
288 | * @gl: The glock to put | |
289 | * | |
290 | */ | |
291 | ||
292 | void gfs2_glock_put(struct gfs2_glock *gl) | |
293 | { | |
294 | if (lockref_put_or_lock(&gl->gl_lockref)) | |
295 | return; | |
296 | ||
297 | __gfs2_glock_put(gl); | |
298 | } | |
299 | ||
6802e340 SW |
300 | /** |
301 | * may_grant - check if its ok to grant a new lock | |
302 | * @gl: The glock | |
303 | * @gh: The lock request which we wish to grant | |
304 | * | |
305 | * Returns: true if its ok to grant the lock | |
306 | */ | |
307 | ||
308 | static inline int may_grant(const struct gfs2_glock *gl, const struct gfs2_holder *gh) | |
309 | { | |
969183bc | 310 | const struct gfs2_holder *gh_head = list_first_entry(&gl->gl_holders, const struct gfs2_holder, gh_list); |
6802e340 SW |
311 | if ((gh->gh_state == LM_ST_EXCLUSIVE || |
312 | gh_head->gh_state == LM_ST_EXCLUSIVE) && gh != gh_head) | |
313 | return 0; | |
314 | if (gl->gl_state == gh->gh_state) | |
315 | return 1; | |
316 | if (gh->gh_flags & GL_EXACT) | |
317 | return 0; | |
209806ab SW |
318 | if (gl->gl_state == LM_ST_EXCLUSIVE) { |
319 | if (gh->gh_state == LM_ST_SHARED && gh_head->gh_state == LM_ST_SHARED) | |
320 | return 1; | |
321 | if (gh->gh_state == LM_ST_DEFERRED && gh_head->gh_state == LM_ST_DEFERRED) | |
322 | return 1; | |
323 | } | |
6802e340 SW |
324 | if (gl->gl_state != LM_ST_UNLOCKED && (gh->gh_flags & LM_FLAG_ANY)) |
325 | return 1; | |
326 | return 0; | |
327 | } | |
328 | ||
329 | static void gfs2_holder_wake(struct gfs2_holder *gh) | |
330 | { | |
331 | clear_bit(HIF_WAIT, &gh->gh_iflags); | |
4e857c58 | 332 | smp_mb__after_atomic(); |
6802e340 | 333 | wake_up_bit(&gh->gh_iflags, HIF_WAIT); |
ad26967b BP |
334 | if (gh->gh_flags & GL_ASYNC) { |
335 | struct gfs2_sbd *sdp = gh->gh_gl->gl_name.ln_sbd; | |
336 | ||
337 | wake_up(&sdp->sd_async_glock_wait); | |
338 | } | |
6802e340 SW |
339 | } |
340 | ||
d5341a92 SW |
341 | /** |
342 | * do_error - Something unexpected has happened during a lock request | |
343 | * | |
344 | */ | |
345 | ||
a527b38e | 346 | static void do_error(struct gfs2_glock *gl, const int ret) |
d5341a92 SW |
347 | { |
348 | struct gfs2_holder *gh, *tmp; | |
349 | ||
350 | list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) { | |
351 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
352 | continue; | |
353 | if (ret & LM_OUT_ERROR) | |
354 | gh->gh_error = -EIO; | |
355 | else if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) | |
356 | gh->gh_error = GLR_TRYFAILED; | |
357 | else | |
358 | continue; | |
359 | list_del_init(&gh->gh_list); | |
360 | trace_gfs2_glock_queue(gh, 0); | |
361 | gfs2_holder_wake(gh); | |
362 | } | |
363 | } | |
364 | ||
6802e340 SW |
365 | /** |
366 | * do_promote - promote as many requests as possible on the current queue | |
367 | * @gl: The glock | |
368 | * | |
813e0c46 SW |
369 | * Returns: 1 if there is a blocked holder at the head of the list, or 2 |
370 | * if a type specific operation is underway. | |
6802e340 SW |
371 | */ |
372 | ||
373 | static int do_promote(struct gfs2_glock *gl) | |
f3dd1649 AG |
374 | __releases(&gl->gl_lockref.lock) |
375 | __acquires(&gl->gl_lockref.lock) | |
6802e340 SW |
376 | { |
377 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
378 | struct gfs2_holder *gh, *tmp; | |
379 | int ret; | |
380 | ||
381 | restart: | |
382 | list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) { | |
383 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
384 | continue; | |
385 | if (may_grant(gl, gh)) { | |
386 | if (gh->gh_list.prev == &gl->gl_holders && | |
387 | glops->go_lock) { | |
f3dd1649 | 388 | spin_unlock(&gl->gl_lockref.lock); |
6802e340 SW |
389 | /* FIXME: eliminate this eventually */ |
390 | ret = glops->go_lock(gh); | |
f3dd1649 | 391 | spin_lock(&gl->gl_lockref.lock); |
6802e340 | 392 | if (ret) { |
813e0c46 SW |
393 | if (ret == 1) |
394 | return 2; | |
6802e340 SW |
395 | gh->gh_error = ret; |
396 | list_del_init(&gh->gh_list); | |
63997775 | 397 | trace_gfs2_glock_queue(gh, 0); |
6802e340 SW |
398 | gfs2_holder_wake(gh); |
399 | goto restart; | |
400 | } | |
401 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
63997775 | 402 | trace_gfs2_promote(gh, 1); |
6802e340 SW |
403 | gfs2_holder_wake(gh); |
404 | goto restart; | |
405 | } | |
406 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
63997775 | 407 | trace_gfs2_promote(gh, 0); |
6802e340 SW |
408 | gfs2_holder_wake(gh); |
409 | continue; | |
410 | } | |
411 | if (gh->gh_list.prev == &gl->gl_holders) | |
412 | return 1; | |
d5341a92 | 413 | do_error(gl, 0); |
6802e340 SW |
414 | break; |
415 | } | |
416 | return 0; | |
417 | } | |
418 | ||
6802e340 SW |
419 | /** |
420 | * find_first_waiter - find the first gh that's waiting for the glock | |
421 | * @gl: the glock | |
422 | */ | |
423 | ||
424 | static inline struct gfs2_holder *find_first_waiter(const struct gfs2_glock *gl) | |
425 | { | |
426 | struct gfs2_holder *gh; | |
427 | ||
428 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
429 | if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
430 | return gh; | |
431 | } | |
432 | return NULL; | |
433 | } | |
434 | ||
435 | /** | |
436 | * state_change - record that the glock is now in a different state | |
437 | * @gl: the glock | |
438 | * @new_state the new state | |
439 | * | |
440 | */ | |
441 | ||
442 | static void state_change(struct gfs2_glock *gl, unsigned int new_state) | |
443 | { | |
444 | int held1, held2; | |
445 | ||
446 | held1 = (gl->gl_state != LM_ST_UNLOCKED); | |
447 | held2 = (new_state != LM_ST_UNLOCKED); | |
448 | ||
449 | if (held1 != held2) { | |
e66cf161 | 450 | GLOCK_BUG_ON(gl, __lockref_is_dead(&gl->gl_lockref)); |
6802e340 | 451 | if (held2) |
e66cf161 | 452 | gl->gl_lockref.count++; |
6802e340 | 453 | else |
e66cf161 | 454 | gl->gl_lockref.count--; |
6802e340 | 455 | } |
7b5e3d5f SW |
456 | if (held1 && held2 && list_empty(&gl->gl_holders)) |
457 | clear_bit(GLF_QUEUED, &gl->gl_flags); | |
6802e340 | 458 | |
7cf8dcd3 BP |
459 | if (new_state != gl->gl_target) |
460 | /* shorten our minimum hold time */ | |
461 | gl->gl_hold_time = max(gl->gl_hold_time - GL_GLOCK_HOLD_DECR, | |
462 | GL_GLOCK_MIN_HOLD); | |
6802e340 SW |
463 | gl->gl_state = new_state; |
464 | gl->gl_tchange = jiffies; | |
465 | } | |
466 | ||
467 | static void gfs2_demote_wake(struct gfs2_glock *gl) | |
468 | { | |
469 | gl->gl_demote_state = LM_ST_EXCLUSIVE; | |
470 | clear_bit(GLF_DEMOTE, &gl->gl_flags); | |
4e857c58 | 471 | smp_mb__after_atomic(); |
6802e340 SW |
472 | wake_up_bit(&gl->gl_flags, GLF_DEMOTE); |
473 | } | |
474 | ||
475 | /** | |
476 | * finish_xmote - The DLM has replied to one of our lock requests | |
477 | * @gl: The glock | |
478 | * @ret: The status from the DLM | |
479 | * | |
480 | */ | |
481 | ||
482 | static void finish_xmote(struct gfs2_glock *gl, unsigned int ret) | |
483 | { | |
484 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
485 | struct gfs2_holder *gh; | |
486 | unsigned state = ret & LM_OUT_ST_MASK; | |
813e0c46 | 487 | int rv; |
6802e340 | 488 | |
f3dd1649 | 489 | spin_lock(&gl->gl_lockref.lock); |
63997775 | 490 | trace_gfs2_glock_state_change(gl, state); |
6802e340 SW |
491 | state_change(gl, state); |
492 | gh = find_first_waiter(gl); | |
493 | ||
494 | /* Demote to UN request arrived during demote to SH or DF */ | |
495 | if (test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags) && | |
496 | state != LM_ST_UNLOCKED && gl->gl_demote_state == LM_ST_UNLOCKED) | |
497 | gl->gl_target = LM_ST_UNLOCKED; | |
498 | ||
499 | /* Check for state != intended state */ | |
500 | if (unlikely(state != gl->gl_target)) { | |
501 | if (gh && !test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)) { | |
502 | /* move to back of queue and try next entry */ | |
503 | if (ret & LM_OUT_CANCELED) { | |
504 | if ((gh->gh_flags & LM_FLAG_PRIORITY) == 0) | |
505 | list_move_tail(&gh->gh_list, &gl->gl_holders); | |
506 | gh = find_first_waiter(gl); | |
507 | gl->gl_target = gh->gh_state; | |
508 | goto retry; | |
509 | } | |
510 | /* Some error or failed "try lock" - report it */ | |
511 | if ((ret & LM_OUT_ERROR) || | |
512 | (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) { | |
513 | gl->gl_target = gl->gl_state; | |
514 | do_error(gl, ret); | |
515 | goto out; | |
516 | } | |
517 | } | |
518 | switch(state) { | |
519 | /* Unlocked due to conversion deadlock, try again */ | |
520 | case LM_ST_UNLOCKED: | |
521 | retry: | |
522 | do_xmote(gl, gh, gl->gl_target); | |
523 | break; | |
524 | /* Conversion fails, unlock and try again */ | |
525 | case LM_ST_SHARED: | |
526 | case LM_ST_DEFERRED: | |
527 | do_xmote(gl, gh, LM_ST_UNLOCKED); | |
528 | break; | |
529 | default: /* Everything else */ | |
e54c78a2 BP |
530 | fs_err(gl->gl_name.ln_sbd, "wanted %u got %u\n", |
531 | gl->gl_target, state); | |
6802e340 SW |
532 | GLOCK_BUG_ON(gl, 1); |
533 | } | |
f3dd1649 | 534 | spin_unlock(&gl->gl_lockref.lock); |
6802e340 SW |
535 | return; |
536 | } | |
537 | ||
538 | /* Fast path - we got what we asked for */ | |
539 | if (test_and_clear_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)) | |
540 | gfs2_demote_wake(gl); | |
541 | if (state != LM_ST_UNLOCKED) { | |
542 | if (glops->go_xmote_bh) { | |
f3dd1649 | 543 | spin_unlock(&gl->gl_lockref.lock); |
6802e340 | 544 | rv = glops->go_xmote_bh(gl, gh); |
f3dd1649 | 545 | spin_lock(&gl->gl_lockref.lock); |
6802e340 SW |
546 | if (rv) { |
547 | do_error(gl, rv); | |
548 | goto out; | |
549 | } | |
550 | } | |
813e0c46 SW |
551 | rv = do_promote(gl); |
552 | if (rv == 2) | |
553 | goto out_locked; | |
6802e340 SW |
554 | } |
555 | out: | |
556 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
813e0c46 | 557 | out_locked: |
f3dd1649 | 558 | spin_unlock(&gl->gl_lockref.lock); |
6802e340 SW |
559 | } |
560 | ||
6802e340 SW |
561 | /** |
562 | * do_xmote - Calls the DLM to change the state of a lock | |
563 | * @gl: The lock state | |
564 | * @gh: The holder (only for promotes) | |
565 | * @target: The target lock state | |
566 | * | |
567 | */ | |
568 | ||
569 | static void do_xmote(struct gfs2_glock *gl, struct gfs2_holder *gh, unsigned int target) | |
f3dd1649 AG |
570 | __releases(&gl->gl_lockref.lock) |
571 | __acquires(&gl->gl_lockref.lock) | |
6802e340 SW |
572 | { |
573 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
15562c43 | 574 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
b58bf407 | 575 | unsigned int lck_flags = (unsigned int)(gh ? gh->gh_flags : 0); |
6802e340 SW |
576 | int ret; |
577 | ||
601ef0d5 BP |
578 | if (target != LM_ST_UNLOCKED && glock_blocked_by_withdraw(gl) && |
579 | gh && !(gh->gh_flags & LM_FLAG_NOEXP)) | |
0d1c7ae9 | 580 | return; |
6802e340 SW |
581 | lck_flags &= (LM_FLAG_TRY | LM_FLAG_TRY_1CB | LM_FLAG_NOEXP | |
582 | LM_FLAG_PRIORITY); | |
921169ca SW |
583 | GLOCK_BUG_ON(gl, gl->gl_state == target); |
584 | GLOCK_BUG_ON(gl, gl->gl_state == gl->gl_target); | |
6802e340 SW |
585 | if ((target == LM_ST_UNLOCKED || target == LM_ST_DEFERRED) && |
586 | glops->go_inval) { | |
d99724c3 BP |
587 | /* |
588 | * If another process is already doing the invalidate, let that | |
589 | * finish first. The glock state machine will get back to this | |
590 | * holder again later. | |
591 | */ | |
592 | if (test_and_set_bit(GLF_INVALIDATE_IN_PROGRESS, | |
593 | &gl->gl_flags)) | |
594 | return; | |
6802e340 SW |
595 | do_error(gl, 0); /* Fail queued try locks */ |
596 | } | |
47a25380 | 597 | gl->gl_req = target; |
a245769f SW |
598 | set_bit(GLF_BLOCKING, &gl->gl_flags); |
599 | if ((gl->gl_req == LM_ST_UNLOCKED) || | |
600 | (gl->gl_state == LM_ST_EXCLUSIVE) || | |
601 | (lck_flags & (LM_FLAG_TRY|LM_FLAG_TRY_1CB))) | |
602 | clear_bit(GLF_BLOCKING, &gl->gl_flags); | |
f3dd1649 | 603 | spin_unlock(&gl->gl_lockref.lock); |
1c634f94 BP |
604 | if (glops->go_sync) { |
605 | ret = glops->go_sync(gl); | |
606 | /* If we had a problem syncing (due to io errors or whatever, | |
607 | * we should not invalidate the metadata or tell dlm to | |
608 | * release the glock to other nodes. | |
609 | */ | |
610 | if (ret) { | |
611 | if (cmpxchg(&sdp->sd_log_error, 0, ret)) { | |
612 | fs_err(sdp, "Error %d syncing glock \n", ret); | |
613 | gfs2_dump_glock(NULL, gl, true); | |
614 | } | |
b11e1a84 | 615 | goto skip_inval; |
1c634f94 BP |
616 | } |
617 | } | |
33dbd1e4 BP |
618 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags)) { |
619 | /* | |
620 | * The call to go_sync should have cleared out the ail list. | |
621 | * If there are still items, we have a problem. We ought to | |
622 | * withdraw, but we can't because the withdraw code also uses | |
623 | * glocks. Warn about the error, dump the glock, then fall | |
624 | * through and wait for logd to do the withdraw for us. | |
625 | */ | |
626 | if ((atomic_read(&gl->gl_ail_count) != 0) && | |
627 | (!cmpxchg(&sdp->sd_log_error, 0, -EIO))) { | |
628 | gfs2_assert_warn(sdp, !atomic_read(&gl->gl_ail_count)); | |
629 | gfs2_dump_glock(NULL, gl, true); | |
630 | } | |
6802e340 | 631 | glops->go_inval(gl, target == LM_ST_DEFERRED ? 0 : DIO_METADATA); |
33dbd1e4 BP |
632 | clear_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags); |
633 | } | |
6802e340 | 634 | |
b11e1a84 | 635 | skip_inval: |
6802e340 | 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)) { | |
969183bc | 693 | gh = list_first_entry(&gl->gl_holders, struct gfs2_holder, gh_list); |
6802e340 SW |
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; | |
725 | set_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags); | |
265d529c | 726 | GLOCK_BUG_ON(gl, gl->gl_demote_state == LM_ST_EXCLUSIVE); |
6802e340 SW |
727 | gl->gl_target = gl->gl_demote_state; |
728 | } else { | |
729 | if (test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
730 | gfs2_demote_wake(gl); | |
813e0c46 SW |
731 | ret = do_promote(gl); |
732 | if (ret == 0) | |
d8348de0 | 733 | goto out_unlock; |
813e0c46 | 734 | if (ret == 2) |
a228df63 | 735 | goto out; |
6802e340 SW |
736 | gh = find_first_waiter(gl); |
737 | gl->gl_target = gh->gh_state; | |
738 | if (!(gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) | |
739 | do_error(gl, 0); /* Fail queued try locks */ | |
740 | } | |
741 | do_xmote(gl, gh, gl->gl_target); | |
a228df63 | 742 | out: |
6802e340 SW |
743 | return; |
744 | ||
745 | out_sched: | |
7e71c55e | 746 | clear_bit(GLF_LOCK, &gl->gl_flags); |
4e857c58 | 747 | smp_mb__after_atomic(); |
e66cf161 | 748 | gl->gl_lockref.count++; |
6b0c7440 | 749 | __gfs2_glock_queue_work(gl, 0); |
7e71c55e SW |
750 | return; |
751 | ||
d8348de0 | 752 | out_unlock: |
6802e340 | 753 | clear_bit(GLF_LOCK, &gl->gl_flags); |
4e857c58 | 754 | smp_mb__after_atomic(); |
7e71c55e | 755 | return; |
6802e340 SW |
756 | } |
757 | ||
f286d627 AG |
758 | void gfs2_inode_remember_delete(struct gfs2_glock *gl, u64 generation) |
759 | { | |
760 | struct gfs2_inode_lvb *ri = (void *)gl->gl_lksb.sb_lvbptr; | |
761 | ||
762 | if (ri->ri_magic == 0) | |
763 | ri->ri_magic = cpu_to_be32(GFS2_MAGIC); | |
764 | if (ri->ri_magic == cpu_to_be32(GFS2_MAGIC)) | |
765 | ri->ri_generation_deleted = cpu_to_be64(generation); | |
766 | } | |
767 | ||
768 | bool gfs2_inode_already_deleted(struct gfs2_glock *gl, u64 generation) | |
769 | { | |
770 | struct gfs2_inode_lvb *ri = (void *)gl->gl_lksb.sb_lvbptr; | |
771 | ||
772 | if (ri->ri_magic != cpu_to_be32(GFS2_MAGIC)) | |
773 | return false; | |
774 | return generation <= be64_to_cpu(ri->ri_generation_deleted); | |
775 | } | |
776 | ||
b94a170e BM |
777 | static void delete_work_func(struct work_struct *work) |
778 | { | |
779 | struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_delete); | |
15562c43 | 780 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
ec5ec66b | 781 | struct inode *inode; |
044b9414 SW |
782 | u64 no_addr = gl->gl_name.ln_number; |
783 | ||
a4923865 BP |
784 | /* If someone's using this glock to create a new dinode, the block must |
785 | have been freed by another node, then re-used, in which case our | |
786 | iopen callback is too late after the fact. Ignore it. */ | |
787 | if (test_bit(GLF_INODE_CREATING, &gl->gl_flags)) | |
788 | goto out; | |
789 | ||
ec5ec66b | 790 | inode = gfs2_lookup_by_inum(sdp, no_addr, NULL, GFS2_BLKST_UNLINKED); |
15a798f7 | 791 | if (!IS_ERR_OR_NULL(inode)) { |
044b9414 SW |
792 | d_prune_aliases(inode); |
793 | iput(inode); | |
b94a170e | 794 | } |
a4923865 | 795 | out: |
b94a170e BM |
796 | gfs2_glock_put(gl); |
797 | } | |
798 | ||
c4f68a13 BM |
799 | static void glock_work_func(struct work_struct *work) |
800 | { | |
6802e340 | 801 | unsigned long delay = 0; |
c4f68a13 | 802 | struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_work.work); |
6b0c7440 | 803 | unsigned int drop_refs = 1; |
c4f68a13 | 804 | |
26bb7505 | 805 | if (test_and_clear_bit(GLF_REPLY_PENDING, &gl->gl_flags)) { |
6802e340 | 806 | finish_xmote(gl, gl->gl_reply); |
6b0c7440 | 807 | drop_refs++; |
26bb7505 | 808 | } |
f3dd1649 | 809 | spin_lock(&gl->gl_lockref.lock); |
f90e5b5b | 810 | if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && |
265d529c SW |
811 | gl->gl_state != LM_ST_UNLOCKED && |
812 | gl->gl_demote_state != LM_ST_EXCLUSIVE) { | |
6802e340 | 813 | unsigned long holdtime, now = jiffies; |
f90e5b5b | 814 | |
7cf8dcd3 | 815 | holdtime = gl->gl_tchange + gl->gl_hold_time; |
6802e340 SW |
816 | if (time_before(now, holdtime)) |
817 | delay = holdtime - now; | |
f90e5b5b BP |
818 | |
819 | if (!delay) { | |
820 | clear_bit(GLF_PENDING_DEMOTE, &gl->gl_flags); | |
821 | set_bit(GLF_DEMOTE, &gl->gl_flags); | |
822 | } | |
6802e340 SW |
823 | } |
824 | run_queue(gl, 0); | |
6b0c7440 AG |
825 | if (delay) { |
826 | /* Keep one glock reference for the work we requeue. */ | |
827 | drop_refs--; | |
7cf8dcd3 BP |
828 | if (gl->gl_name.ln_type != LM_TYPE_INODE) |
829 | delay = 0; | |
6b0c7440 | 830 | __gfs2_glock_queue_work(gl, delay); |
7cf8dcd3 | 831 | } |
6b0c7440 AG |
832 | |
833 | /* | |
834 | * Drop the remaining glock references manually here. (Mind that | |
835 | * __gfs2_glock_queue_work depends on the lockref spinlock begin held | |
836 | * here as well.) | |
837 | */ | |
838 | gl->gl_lockref.count -= drop_refs; | |
839 | if (!gl->gl_lockref.count) { | |
840 | __gfs2_glock_put(gl); | |
841 | return; | |
842 | } | |
843 | spin_unlock(&gl->gl_lockref.lock); | |
c4f68a13 BM |
844 | } |
845 | ||
0515480a AG |
846 | static struct gfs2_glock *find_insert_glock(struct lm_lockname *name, |
847 | struct gfs2_glock *new) | |
848 | { | |
849 | struct wait_glock_queue wait; | |
a91323e2 | 850 | wait_queue_head_t *wq = glock_waitqueue(name); |
0515480a AG |
851 | struct gfs2_glock *gl; |
852 | ||
a91323e2 AG |
853 | wait.name = name; |
854 | init_wait(&wait.wait); | |
855 | wait.wait.func = glock_wake_function; | |
856 | ||
0515480a | 857 | again: |
a91323e2 | 858 | prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE); |
0515480a AG |
859 | rcu_read_lock(); |
860 | if (new) { | |
861 | gl = rhashtable_lookup_get_insert_fast(&gl_hash_table, | |
862 | &new->gl_node, ht_parms); | |
863 | if (IS_ERR(gl)) | |
864 | goto out; | |
865 | } else { | |
866 | gl = rhashtable_lookup_fast(&gl_hash_table, | |
867 | name, ht_parms); | |
868 | } | |
869 | if (gl && !lockref_get_not_dead(&gl->gl_lockref)) { | |
870 | rcu_read_unlock(); | |
871 | schedule(); | |
872 | goto again; | |
873 | } | |
874 | out: | |
875 | rcu_read_unlock(); | |
a91323e2 | 876 | finish_wait(wq, &wait.wait); |
0515480a AG |
877 | return gl; |
878 | } | |
879 | ||
b3b94faa DT |
880 | /** |
881 | * gfs2_glock_get() - Get a glock, or create one if one doesn't exist | |
882 | * @sdp: The GFS2 superblock | |
883 | * @number: the lock number | |
884 | * @glops: The glock_operations to use | |
885 | * @create: If 0, don't create the glock if it doesn't exist | |
886 | * @glp: the glock is returned here | |
887 | * | |
888 | * This does not lock a glock, just finds/creates structures for one. | |
889 | * | |
890 | * Returns: errno | |
891 | */ | |
892 | ||
cd915493 | 893 | int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 | 894 | const struct gfs2_glock_operations *glops, int create, |
b3b94faa DT |
895 | struct gfs2_glock **glp) |
896 | { | |
009d8518 | 897 | struct super_block *s = sdp->sd_vfs; |
15562c43 BP |
898 | struct lm_lockname name = { .ln_number = number, |
899 | .ln_type = glops->go_type, | |
900 | .ln_sbd = sdp }; | |
0a52aba7 | 901 | struct gfs2_glock *gl, *tmp; |
009d8518 | 902 | struct address_space *mapping; |
bc015cb8 | 903 | struct kmem_cache *cachep; |
0a52aba7 | 904 | int ret = 0; |
b3b94faa | 905 | |
0515480a AG |
906 | gl = find_insert_glock(&name, NULL); |
907 | if (gl) { | |
908 | *glp = gl; | |
b3b94faa | 909 | return 0; |
0515480a | 910 | } |
64d576ba SW |
911 | if (!create) |
912 | return -ENOENT; | |
b3b94faa | 913 | |
009d8518 | 914 | if (glops->go_flags & GLOF_ASPACE) |
bc015cb8 | 915 | cachep = gfs2_glock_aspace_cachep; |
009d8518 | 916 | else |
bc015cb8 | 917 | cachep = gfs2_glock_cachep; |
fe0bbd29 | 918 | gl = kmem_cache_alloc(cachep, GFP_NOFS); |
b3b94faa DT |
919 | if (!gl) |
920 | return -ENOMEM; | |
921 | ||
dba2d70c | 922 | memset(&gl->gl_lksb, 0, sizeof(struct dlm_lksb)); |
dba2d70c DT |
923 | |
924 | if (glops->go_flags & GLOF_LVB) { | |
f7be987b | 925 | gl->gl_lksb.sb_lvbptr = kzalloc(GDLM_LVB_SIZE, GFP_NOFS); |
4e2f8849 | 926 | if (!gl->gl_lksb.sb_lvbptr) { |
dba2d70c DT |
927 | kmem_cache_free(cachep, gl); |
928 | return -ENOMEM; | |
929 | } | |
dba2d70c DT |
930 | } |
931 | ||
8f05228e | 932 | atomic_inc(&sdp->sd_glock_disposal); |
88ffbf3e | 933 | gl->gl_node.next = NULL; |
ec45d9f5 | 934 | gl->gl_flags = 0; |
b3b94faa | 935 | gl->gl_name = name; |
e66cf161 | 936 | gl->gl_lockref.count = 1; |
b3b94faa | 937 | gl->gl_state = LM_ST_UNLOCKED; |
6802e340 | 938 | gl->gl_target = LM_ST_UNLOCKED; |
c4f68a13 | 939 | gl->gl_demote_state = LM_ST_EXCLUSIVE; |
b3b94faa | 940 | gl->gl_ops = glops; |
8b0e1953 | 941 | gl->gl_dstamp = 0; |
a245769f SW |
942 | preempt_disable(); |
943 | /* We use the global stats to estimate the initial per-glock stats */ | |
944 | gl->gl_stats = this_cpu_ptr(sdp->sd_lkstats)->lkstats[glops->go_type]; | |
945 | preempt_enable(); | |
946 | gl->gl_stats.stats[GFS2_LKS_DCOUNT] = 0; | |
947 | gl->gl_stats.stats[GFS2_LKS_QCOUNT] = 0; | |
c4f68a13 | 948 | gl->gl_tchange = jiffies; |
ec45d9f5 | 949 | gl->gl_object = NULL; |
7cf8dcd3 | 950 | gl->gl_hold_time = GL_GLOCK_DFT_HOLD; |
c4f68a13 | 951 | INIT_DELAYED_WORK(&gl->gl_work, glock_work_func); |
b94a170e | 952 | INIT_WORK(&gl->gl_delete, delete_work_func); |
b3b94faa | 953 | |
009d8518 SW |
954 | mapping = gfs2_glock2aspace(gl); |
955 | if (mapping) { | |
956 | mapping->a_ops = &gfs2_meta_aops; | |
957 | mapping->host = s->s_bdev->bd_inode; | |
958 | mapping->flags = 0; | |
959 | mapping_set_gfp_mask(mapping, GFP_NOFS); | |
252aa6f5 | 960 | mapping->private_data = NULL; |
009d8518 | 961 | mapping->writeback_index = 0; |
b3b94faa DT |
962 | } |
963 | ||
0515480a | 964 | tmp = find_insert_glock(&name, gl); |
0a52aba7 | 965 | if (!tmp) { |
88ffbf3e | 966 | *glp = gl; |
0a52aba7 | 967 | goto out; |
b3b94faa | 968 | } |
0a52aba7 AG |
969 | if (IS_ERR(tmp)) { |
970 | ret = PTR_ERR(tmp); | |
971 | goto out_free; | |
972 | } | |
0515480a | 973 | *glp = tmp; |
0a52aba7 AG |
974 | |
975 | out_free: | |
88ffbf3e BP |
976 | kfree(gl->gl_lksb.sb_lvbptr); |
977 | kmem_cache_free(cachep, gl); | |
978 | atomic_dec(&sdp->sd_glock_disposal); | |
b3b94faa | 979 | |
0a52aba7 | 980 | out: |
88ffbf3e | 981 | return ret; |
b3b94faa DT |
982 | } |
983 | ||
984 | /** | |
985 | * gfs2_holder_init - initialize a struct gfs2_holder in the default way | |
986 | * @gl: the glock | |
987 | * @state: the state we're requesting | |
988 | * @flags: the modifier flags | |
989 | * @gh: the holder structure | |
990 | * | |
991 | */ | |
992 | ||
b58bf407 | 993 | void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, u16 flags, |
b3b94faa DT |
994 | struct gfs2_holder *gh) |
995 | { | |
996 | INIT_LIST_HEAD(&gh->gh_list); | |
997 | gh->gh_gl = gl; | |
d29c0afe | 998 | gh->gh_ip = _RET_IP_; |
b1e058da | 999 | gh->gh_owner_pid = get_pid(task_pid(current)); |
b3b94faa DT |
1000 | gh->gh_state = state; |
1001 | gh->gh_flags = flags; | |
1002 | gh->gh_error = 0; | |
1003 | gh->gh_iflags = 0; | |
b3b94faa DT |
1004 | gfs2_glock_hold(gl); |
1005 | } | |
1006 | ||
1007 | /** | |
1008 | * gfs2_holder_reinit - reinitialize a struct gfs2_holder so we can requeue it | |
1009 | * @state: the state we're requesting | |
1010 | * @flags: the modifier flags | |
1011 | * @gh: the holder structure | |
1012 | * | |
1013 | * Don't mess with the glock. | |
1014 | * | |
1015 | */ | |
1016 | ||
b58bf407 | 1017 | void gfs2_holder_reinit(unsigned int state, u16 flags, struct gfs2_holder *gh) |
b3b94faa DT |
1018 | { |
1019 | gh->gh_state = state; | |
579b78a4 | 1020 | gh->gh_flags = flags; |
3b8249f6 | 1021 | gh->gh_iflags = 0; |
d29c0afe | 1022 | gh->gh_ip = _RET_IP_; |
30badc95 | 1023 | put_pid(gh->gh_owner_pid); |
1a0eae88 | 1024 | gh->gh_owner_pid = get_pid(task_pid(current)); |
b3b94faa DT |
1025 | } |
1026 | ||
1027 | /** | |
1028 | * gfs2_holder_uninit - uninitialize a holder structure (drop glock reference) | |
1029 | * @gh: the holder structure | |
1030 | * | |
1031 | */ | |
1032 | ||
1033 | void gfs2_holder_uninit(struct gfs2_holder *gh) | |
1034 | { | |
b1e058da | 1035 | put_pid(gh->gh_owner_pid); |
b3b94faa | 1036 | gfs2_glock_put(gh->gh_gl); |
6df9f9a2 | 1037 | gfs2_holder_mark_uninitialized(gh); |
d0dc80db | 1038 | gh->gh_ip = 0; |
b3b94faa DT |
1039 | } |
1040 | ||
01123cf1 AG |
1041 | static void gfs2_glock_update_hold_time(struct gfs2_glock *gl, |
1042 | unsigned long start_time) | |
1043 | { | |
1044 | /* Have we waited longer that a second? */ | |
1045 | if (time_after(jiffies, start_time + HZ)) { | |
1046 | /* Lengthen the minimum hold time. */ | |
1047 | gl->gl_hold_time = min(gl->gl_hold_time + GL_GLOCK_HOLD_INCR, | |
1048 | GL_GLOCK_MAX_HOLD); | |
1049 | } | |
1050 | } | |
1051 | ||
07a79049 BP |
1052 | /** |
1053 | * gfs2_glock_wait - wait on a glock acquisition | |
1054 | * @gh: the glock holder | |
1055 | * | |
1056 | * Returns: 0 on success | |
1057 | */ | |
1058 | ||
1059 | int gfs2_glock_wait(struct gfs2_holder *gh) | |
da755fdb | 1060 | { |
01123cf1 | 1061 | unsigned long start_time = jiffies; |
7cf8dcd3 | 1062 | |
6802e340 | 1063 | might_sleep(); |
74316201 | 1064 | wait_on_bit(&gh->gh_iflags, HIF_WAIT, TASK_UNINTERRUPTIBLE); |
01123cf1 | 1065 | gfs2_glock_update_hold_time(gh->gh_gl, start_time); |
07a79049 | 1066 | return gh->gh_error; |
da755fdb SW |
1067 | } |
1068 | ||
ad26967b BP |
1069 | static int glocks_pending(unsigned int num_gh, struct gfs2_holder *ghs) |
1070 | { | |
1071 | int i; | |
1072 | ||
1073 | for (i = 0; i < num_gh; i++) | |
1074 | if (test_bit(HIF_WAIT, &ghs[i].gh_iflags)) | |
1075 | return 1; | |
1076 | return 0; | |
1077 | } | |
1078 | ||
1079 | /** | |
1080 | * gfs2_glock_async_wait - wait on multiple asynchronous glock acquisitions | |
1081 | * @num_gh: the number of holders in the array | |
1082 | * @ghs: the glock holder array | |
1083 | * | |
1084 | * Returns: 0 on success, meaning all glocks have been granted and are held. | |
1085 | * -ESTALE if the request timed out, meaning all glocks were released, | |
1086 | * and the caller should retry the operation. | |
1087 | */ | |
1088 | ||
1089 | int gfs2_glock_async_wait(unsigned int num_gh, struct gfs2_holder *ghs) | |
1090 | { | |
1091 | struct gfs2_sbd *sdp = ghs[0].gh_gl->gl_name.ln_sbd; | |
1092 | int i, ret = 0, timeout = 0; | |
1093 | unsigned long start_time = jiffies; | |
1094 | bool keep_waiting; | |
1095 | ||
1096 | might_sleep(); | |
1097 | /* | |
1098 | * Total up the (minimum hold time * 2) of all glocks and use that to | |
1099 | * determine the max amount of time we should wait. | |
1100 | */ | |
1101 | for (i = 0; i < num_gh; i++) | |
1102 | timeout += ghs[i].gh_gl->gl_hold_time << 1; | |
1103 | ||
1104 | wait_for_dlm: | |
1105 | if (!wait_event_timeout(sdp->sd_async_glock_wait, | |
1106 | !glocks_pending(num_gh, ghs), timeout)) | |
1107 | ret = -ESTALE; /* request timed out. */ | |
1108 | ||
1109 | /* | |
1110 | * If dlm granted all our requests, we need to adjust the glock | |
1111 | * minimum hold time values according to how long we waited. | |
1112 | * | |
1113 | * If our request timed out, we need to repeatedly release any held | |
1114 | * glocks we acquired thus far to allow dlm to acquire the remaining | |
1115 | * glocks without deadlocking. We cannot currently cancel outstanding | |
1116 | * glock acquisitions. | |
1117 | * | |
1118 | * The HIF_WAIT bit tells us which requests still need a response from | |
1119 | * dlm. | |
1120 | * | |
1121 | * If dlm sent us any errors, we return the first error we find. | |
1122 | */ | |
1123 | keep_waiting = false; | |
1124 | for (i = 0; i < num_gh; i++) { | |
1125 | /* Skip holders we have already dequeued below. */ | |
1126 | if (!gfs2_holder_queued(&ghs[i])) | |
1127 | continue; | |
1128 | /* Skip holders with a pending DLM response. */ | |
1129 | if (test_bit(HIF_WAIT, &ghs[i].gh_iflags)) { | |
1130 | keep_waiting = true; | |
1131 | continue; | |
1132 | } | |
1133 | ||
1134 | if (test_bit(HIF_HOLDER, &ghs[i].gh_iflags)) { | |
1135 | if (ret == -ESTALE) | |
1136 | gfs2_glock_dq(&ghs[i]); | |
1137 | else | |
1138 | gfs2_glock_update_hold_time(ghs[i].gh_gl, | |
1139 | start_time); | |
1140 | } | |
1141 | if (!ret) | |
1142 | ret = ghs[i].gh_error; | |
1143 | } | |
1144 | ||
1145 | if (keep_waiting) | |
1146 | goto wait_for_dlm; | |
1147 | ||
1148 | /* | |
1149 | * At this point, we've either acquired all locks or released them all. | |
1150 | */ | |
1151 | return ret; | |
1152 | } | |
1153 | ||
b3b94faa | 1154 | /** |
6802e340 SW |
1155 | * handle_callback - process a demote request |
1156 | * @gl: the glock | |
1157 | * @state: the state the caller wants us to change to | |
b3b94faa | 1158 | * |
6802e340 SW |
1159 | * There are only two requests that we are going to see in actual |
1160 | * practise: LM_ST_SHARED and LM_ST_UNLOCKED | |
b3b94faa DT |
1161 | */ |
1162 | ||
6802e340 | 1163 | static void handle_callback(struct gfs2_glock *gl, unsigned int state, |
81ffbf65 | 1164 | unsigned long delay, bool remote) |
b3b94faa | 1165 | { |
6802e340 | 1166 | int bit = delay ? GLF_PENDING_DEMOTE : GLF_DEMOTE; |
b3b94faa | 1167 | |
6802e340 SW |
1168 | set_bit(bit, &gl->gl_flags); |
1169 | if (gl->gl_demote_state == LM_ST_EXCLUSIVE) { | |
1170 | gl->gl_demote_state = state; | |
1171 | gl->gl_demote_time = jiffies; | |
6802e340 SW |
1172 | } else if (gl->gl_demote_state != LM_ST_UNLOCKED && |
1173 | gl->gl_demote_state != state) { | |
1174 | gl->gl_demote_state = LM_ST_UNLOCKED; | |
b3b94faa | 1175 | } |
b94a170e | 1176 | if (gl->gl_ops->go_callback) |
81ffbf65 | 1177 | gl->gl_ops->go_callback(gl, remote); |
7bd8b2eb | 1178 | trace_gfs2_demote_rq(gl, remote); |
b3b94faa DT |
1179 | } |
1180 | ||
6802e340 | 1181 | void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...) |
7c52b166 | 1182 | { |
5e69069c | 1183 | struct va_format vaf; |
7c52b166 RP |
1184 | va_list args; |
1185 | ||
1186 | va_start(args, fmt); | |
5e69069c | 1187 | |
6802e340 | 1188 | if (seq) { |
1bb49303 | 1189 | seq_vprintf(seq, fmt, args); |
6802e340 | 1190 | } else { |
5e69069c JP |
1191 | vaf.fmt = fmt; |
1192 | vaf.va = &args; | |
1193 | ||
d77d1b58 | 1194 | pr_err("%pV", &vaf); |
6802e340 | 1195 | } |
5e69069c | 1196 | |
7c52b166 RP |
1197 | va_end(args); |
1198 | } | |
1199 | ||
b3b94faa DT |
1200 | /** |
1201 | * add_to_queue - Add a holder to the wait queue (but look for recursion) | |
1202 | * @gh: the holder structure to add | |
1203 | * | |
6802e340 SW |
1204 | * Eventually we should move the recursive locking trap to a |
1205 | * debugging option or something like that. This is the fast | |
1206 | * path and needs to have the minimum number of distractions. | |
1207 | * | |
b3b94faa DT |
1208 | */ |
1209 | ||
6802e340 | 1210 | static inline void add_to_queue(struct gfs2_holder *gh) |
f3dd1649 AG |
1211 | __releases(&gl->gl_lockref.lock) |
1212 | __acquires(&gl->gl_lockref.lock) | |
b3b94faa DT |
1213 | { |
1214 | struct gfs2_glock *gl = gh->gh_gl; | |
15562c43 | 1215 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
6802e340 SW |
1216 | struct list_head *insert_pt = NULL; |
1217 | struct gfs2_holder *gh2; | |
e5dc76b9 | 1218 | int try_futile = 0; |
b3b94faa | 1219 | |
ad26967b | 1220 | GLOCK_BUG_ON(gl, gh->gh_owner_pid == NULL); |
fee852e3 | 1221 | if (test_and_set_bit(HIF_WAIT, &gh->gh_iflags)) |
ad26967b | 1222 | GLOCK_BUG_ON(gl, true); |
190562bd | 1223 | |
6802e340 SW |
1224 | if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { |
1225 | if (test_bit(GLF_LOCK, &gl->gl_flags)) | |
e5dc76b9 | 1226 | try_futile = !may_grant(gl, gh); |
6802e340 SW |
1227 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags)) |
1228 | goto fail; | |
1229 | } | |
1230 | ||
1231 | list_for_each_entry(gh2, &gl->gl_holders, gh_list) { | |
1232 | if (unlikely(gh2->gh_owner_pid == gh->gh_owner_pid && | |
1233 | (gh->gh_gl->gl_ops->go_type != LM_TYPE_FLOCK))) | |
1234 | goto trap_recursive; | |
e5dc76b9 BP |
1235 | if (try_futile && |
1236 | !(gh2->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) { | |
6802e340 SW |
1237 | fail: |
1238 | gh->gh_error = GLR_TRYFAILED; | |
1239 | gfs2_holder_wake(gh); | |
1240 | return; | |
b4c20166 | 1241 | } |
6802e340 SW |
1242 | if (test_bit(HIF_HOLDER, &gh2->gh_iflags)) |
1243 | continue; | |
1244 | if (unlikely((gh->gh_flags & LM_FLAG_PRIORITY) && !insert_pt)) | |
1245 | insert_pt = &gh2->gh_list; | |
1246 | } | |
7b5e3d5f | 1247 | set_bit(GLF_QUEUED, &gl->gl_flags); |
edae38a6 | 1248 | trace_gfs2_glock_queue(gh, 1); |
a245769f SW |
1249 | gfs2_glstats_inc(gl, GFS2_LKS_QCOUNT); |
1250 | gfs2_sbstats_inc(gl, GFS2_LKS_QCOUNT); | |
6802e340 SW |
1251 | if (likely(insert_pt == NULL)) { |
1252 | list_add_tail(&gh->gh_list, &gl->gl_holders); | |
1253 | if (unlikely(gh->gh_flags & LM_FLAG_PRIORITY)) | |
1254 | goto do_cancel; | |
1255 | return; | |
1256 | } | |
1257 | list_add_tail(&gh->gh_list, insert_pt); | |
1258 | do_cancel: | |
969183bc | 1259 | gh = list_first_entry(&gl->gl_holders, struct gfs2_holder, gh_list); |
6802e340 | 1260 | if (!(gh->gh_flags & LM_FLAG_PRIORITY)) { |
f3dd1649 | 1261 | spin_unlock(&gl->gl_lockref.lock); |
048bca22 | 1262 | if (sdp->sd_lockstruct.ls_ops->lm_cancel) |
f057f6cd | 1263 | sdp->sd_lockstruct.ls_ops->lm_cancel(gl); |
f3dd1649 | 1264 | spin_lock(&gl->gl_lockref.lock); |
b3b94faa | 1265 | } |
6802e340 | 1266 | return; |
b3b94faa | 1267 | |
6802e340 | 1268 | trap_recursive: |
e54c78a2 BP |
1269 | fs_err(sdp, "original: %pSR\n", (void *)gh2->gh_ip); |
1270 | fs_err(sdp, "pid: %d\n", pid_nr(gh2->gh_owner_pid)); | |
1271 | fs_err(sdp, "lock type: %d req lock state : %d\n", | |
6802e340 | 1272 | gh2->gh_gl->gl_name.ln_type, gh2->gh_state); |
e54c78a2 BP |
1273 | fs_err(sdp, "new: %pSR\n", (void *)gh->gh_ip); |
1274 | fs_err(sdp, "pid: %d\n", pid_nr(gh->gh_owner_pid)); | |
1275 | fs_err(sdp, "lock type: %d req lock state : %d\n", | |
6802e340 | 1276 | gh->gh_gl->gl_name.ln_type, gh->gh_state); |
3792ce97 | 1277 | gfs2_dump_glock(NULL, gl, true); |
6802e340 | 1278 | BUG(); |
b3b94faa DT |
1279 | } |
1280 | ||
1281 | /** | |
1282 | * gfs2_glock_nq - enqueue a struct gfs2_holder onto a glock (acquire a glock) | |
1283 | * @gh: the holder structure | |
1284 | * | |
1285 | * if (gh->gh_flags & GL_ASYNC), this never returns an error | |
1286 | * | |
1287 | * Returns: 0, GLR_TRYFAILED, or errno on failure | |
1288 | */ | |
1289 | ||
1290 | int gfs2_glock_nq(struct gfs2_holder *gh) | |
1291 | { | |
1292 | struct gfs2_glock *gl = gh->gh_gl; | |
b3b94faa DT |
1293 | int error = 0; |
1294 | ||
601ef0d5 | 1295 | if (glock_blocked_by_withdraw(gl) && !(gh->gh_flags & LM_FLAG_NOEXP)) |
b3b94faa | 1296 | return -EIO; |
b3b94faa | 1297 | |
f42ab085 SW |
1298 | if (test_bit(GLF_LRU, &gl->gl_flags)) |
1299 | gfs2_glock_remove_from_lru(gl); | |
1300 | ||
f3dd1649 | 1301 | spin_lock(&gl->gl_lockref.lock); |
b3b94faa | 1302 | add_to_queue(gh); |
01b172b7 BP |
1303 | if (unlikely((LM_FLAG_NOEXP & gh->gh_flags) && |
1304 | test_and_clear_bit(GLF_FROZEN, &gl->gl_flags))) { | |
0809f6ec | 1305 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
01b172b7 | 1306 | gl->gl_lockref.count++; |
6b0c7440 | 1307 | __gfs2_glock_queue_work(gl, 0); |
01b172b7 | 1308 | } |
6802e340 | 1309 | run_queue(gl, 1); |
f3dd1649 | 1310 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa | 1311 | |
6802e340 SW |
1312 | if (!(gh->gh_flags & GL_ASYNC)) |
1313 | error = gfs2_glock_wait(gh); | |
b3b94faa | 1314 | |
b3b94faa DT |
1315 | return error; |
1316 | } | |
1317 | ||
1318 | /** | |
1319 | * gfs2_glock_poll - poll to see if an async request has been completed | |
1320 | * @gh: the holder | |
1321 | * | |
1322 | * Returns: 1 if the request is ready to be gfs2_glock_wait()ed on | |
1323 | */ | |
1324 | ||
1325 | int gfs2_glock_poll(struct gfs2_holder *gh) | |
1326 | { | |
6802e340 | 1327 | return test_bit(HIF_WAIT, &gh->gh_iflags) ? 0 : 1; |
b3b94faa DT |
1328 | } |
1329 | ||
1330 | /** | |
1331 | * gfs2_glock_dq - dequeue a struct gfs2_holder from a glock (release a glock) | |
1332 | * @gh: the glock holder | |
1333 | * | |
1334 | */ | |
1335 | ||
1336 | void gfs2_glock_dq(struct gfs2_holder *gh) | |
1337 | { | |
1338 | struct gfs2_glock *gl = gh->gh_gl; | |
601ef0d5 | 1339 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
c4f68a13 | 1340 | unsigned delay = 0; |
6802e340 | 1341 | int fast_path = 0; |
b3b94faa | 1342 | |
f3dd1649 | 1343 | spin_lock(&gl->gl_lockref.lock); |
601ef0d5 BP |
1344 | /* |
1345 | * If we're in the process of file system withdraw, we cannot just | |
1346 | * dequeue any glocks until our journal is recovered, lest we | |
1347 | * introduce file system corruption. We need two exceptions to this | |
1348 | * rule: We need to allow unlocking of nondisk glocks and the glock | |
1349 | * for our own journal that needs recovery. | |
1350 | */ | |
1351 | if (test_bit(SDF_WITHDRAW_RECOVERY, &sdp->sd_flags) && | |
1352 | glock_blocked_by_withdraw(gl) && | |
1353 | gh->gh_gl != sdp->sd_jinode_gl) { | |
1354 | sdp->sd_glock_dqs_held++; | |
1355 | might_sleep(); | |
1356 | wait_on_bit(&sdp->sd_flags, SDF_WITHDRAW_RECOVERY, | |
1357 | TASK_UNINTERRUPTIBLE); | |
1358 | } | |
b3b94faa | 1359 | if (gh->gh_flags & GL_NOCACHE) |
81ffbf65 | 1360 | handle_callback(gl, LM_ST_UNLOCKED, 0, false); |
b3b94faa | 1361 | |
b3b94faa | 1362 | list_del_init(&gh->gh_list); |
7508abc4 | 1363 | clear_bit(HIF_HOLDER, &gh->gh_iflags); |
6802e340 | 1364 | if (find_first_holder(gl) == NULL) { |
6802e340 SW |
1365 | if (list_empty(&gl->gl_holders) && |
1366 | !test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && | |
1367 | !test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
1368 | fast_path = 1; | |
b3b94faa | 1369 | } |
7881ef3f | 1370 | if (!test_bit(GLF_LFLUSH, &gl->gl_flags) && demote_ok(gl)) |
4abb6ad9 BP |
1371 | gfs2_glock_add_to_lru(gl); |
1372 | ||
63997775 | 1373 | trace_gfs2_glock_queue(gh, 0); |
6b0c7440 AG |
1374 | if (unlikely(!fast_path)) { |
1375 | gl->gl_lockref.count++; | |
1376 | if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && | |
1377 | !test_bit(GLF_DEMOTE, &gl->gl_flags) && | |
1378 | gl->gl_name.ln_type == LM_TYPE_INODE) | |
1379 | delay = gl->gl_hold_time; | |
1380 | __gfs2_glock_queue_work(gl, delay); | |
1381 | } | |
f3dd1649 | 1382 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa DT |
1383 | } |
1384 | ||
d93cfa98 AD |
1385 | void gfs2_glock_dq_wait(struct gfs2_holder *gh) |
1386 | { | |
1387 | struct gfs2_glock *gl = gh->gh_gl; | |
1388 | gfs2_glock_dq(gh); | |
81e1d450 | 1389 | might_sleep(); |
74316201 | 1390 | wait_on_bit(&gl->gl_flags, GLF_DEMOTE, TASK_UNINTERRUPTIBLE); |
d93cfa98 AD |
1391 | } |
1392 | ||
b3b94faa DT |
1393 | /** |
1394 | * gfs2_glock_dq_uninit - dequeue a holder from a glock and initialize it | |
1395 | * @gh: the holder structure | |
1396 | * | |
1397 | */ | |
1398 | ||
1399 | void gfs2_glock_dq_uninit(struct gfs2_holder *gh) | |
1400 | { | |
1401 | gfs2_glock_dq(gh); | |
1402 | gfs2_holder_uninit(gh); | |
1403 | } | |
1404 | ||
1405 | /** | |
1406 | * gfs2_glock_nq_num - acquire a glock based on lock number | |
1407 | * @sdp: the filesystem | |
1408 | * @number: the lock number | |
1409 | * @glops: the glock operations for the type of glock | |
1410 | * @state: the state to acquire the glock in | |
25985edc | 1411 | * @flags: modifier flags for the acquisition |
b3b94faa DT |
1412 | * @gh: the struct gfs2_holder |
1413 | * | |
1414 | * Returns: errno | |
1415 | */ | |
1416 | ||
cd915493 | 1417 | int gfs2_glock_nq_num(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 | 1418 | const struct gfs2_glock_operations *glops, |
b58bf407 | 1419 | unsigned int state, u16 flags, struct gfs2_holder *gh) |
b3b94faa DT |
1420 | { |
1421 | struct gfs2_glock *gl; | |
1422 | int error; | |
1423 | ||
1424 | error = gfs2_glock_get(sdp, number, glops, CREATE, &gl); | |
1425 | if (!error) { | |
1426 | error = gfs2_glock_nq_init(gl, state, flags, gh); | |
1427 | gfs2_glock_put(gl); | |
1428 | } | |
1429 | ||
1430 | return error; | |
1431 | } | |
1432 | ||
1433 | /** | |
1434 | * glock_compare - Compare two struct gfs2_glock structures for sorting | |
1435 | * @arg_a: the first structure | |
1436 | * @arg_b: the second structure | |
1437 | * | |
1438 | */ | |
1439 | ||
1440 | static int glock_compare(const void *arg_a, const void *arg_b) | |
1441 | { | |
a5e08a9e SW |
1442 | const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a; |
1443 | const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b; | |
1444 | const struct lm_lockname *a = &gh_a->gh_gl->gl_name; | |
1445 | const struct lm_lockname *b = &gh_b->gh_gl->gl_name; | |
b3b94faa DT |
1446 | |
1447 | if (a->ln_number > b->ln_number) | |
a5e08a9e SW |
1448 | return 1; |
1449 | if (a->ln_number < b->ln_number) | |
1450 | return -1; | |
1c0f4872 | 1451 | BUG_ON(gh_a->gh_gl->gl_ops->go_type == gh_b->gh_gl->gl_ops->go_type); |
a5e08a9e | 1452 | return 0; |
b3b94faa DT |
1453 | } |
1454 | ||
1455 | /** | |
1456 | * nq_m_sync - synchonously acquire more than one glock in deadlock free order | |
1457 | * @num_gh: the number of structures | |
1458 | * @ghs: an array of struct gfs2_holder structures | |
1459 | * | |
1460 | * Returns: 0 on success (all glocks acquired), | |
1461 | * errno on failure (no glocks acquired) | |
1462 | */ | |
1463 | ||
1464 | static int nq_m_sync(unsigned int num_gh, struct gfs2_holder *ghs, | |
1465 | struct gfs2_holder **p) | |
1466 | { | |
1467 | unsigned int x; | |
1468 | int error = 0; | |
1469 | ||
1470 | for (x = 0; x < num_gh; x++) | |
1471 | p[x] = &ghs[x]; | |
1472 | ||
1473 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare, NULL); | |
1474 | ||
1475 | for (x = 0; x < num_gh; x++) { | |
1476 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1477 | ||
1478 | error = gfs2_glock_nq(p[x]); | |
1479 | if (error) { | |
1480 | while (x--) | |
1481 | gfs2_glock_dq(p[x]); | |
1482 | break; | |
1483 | } | |
1484 | } | |
1485 | ||
1486 | return error; | |
1487 | } | |
1488 | ||
1489 | /** | |
1490 | * gfs2_glock_nq_m - acquire multiple glocks | |
1491 | * @num_gh: the number of structures | |
1492 | * @ghs: an array of struct gfs2_holder structures | |
1493 | * | |
b3b94faa DT |
1494 | * |
1495 | * Returns: 0 on success (all glocks acquired), | |
1496 | * errno on failure (no glocks acquired) | |
1497 | */ | |
1498 | ||
1499 | int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1500 | { | |
eaf5bd3c SW |
1501 | struct gfs2_holder *tmp[4]; |
1502 | struct gfs2_holder **pph = tmp; | |
b3b94faa DT |
1503 | int error = 0; |
1504 | ||
eaf5bd3c SW |
1505 | switch(num_gh) { |
1506 | case 0: | |
b3b94faa | 1507 | return 0; |
eaf5bd3c | 1508 | case 1: |
b3b94faa DT |
1509 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); |
1510 | return gfs2_glock_nq(ghs); | |
eaf5bd3c SW |
1511 | default: |
1512 | if (num_gh <= 4) | |
b3b94faa | 1513 | break; |
6da2ec56 KC |
1514 | pph = kmalloc_array(num_gh, sizeof(struct gfs2_holder *), |
1515 | GFP_NOFS); | |
eaf5bd3c SW |
1516 | if (!pph) |
1517 | return -ENOMEM; | |
b3b94faa DT |
1518 | } |
1519 | ||
eaf5bd3c | 1520 | error = nq_m_sync(num_gh, ghs, pph); |
b3b94faa | 1521 | |
eaf5bd3c SW |
1522 | if (pph != tmp) |
1523 | kfree(pph); | |
b3b94faa DT |
1524 | |
1525 | return error; | |
1526 | } | |
1527 | ||
1528 | /** | |
1529 | * gfs2_glock_dq_m - release multiple glocks | |
1530 | * @num_gh: the number of structures | |
1531 | * @ghs: an array of struct gfs2_holder structures | |
1532 | * | |
1533 | */ | |
1534 | ||
1535 | void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1536 | { | |
fa1bbdea BP |
1537 | while (num_gh--) |
1538 | gfs2_glock_dq(&ghs[num_gh]); | |
b3b94faa DT |
1539 | } |
1540 | ||
f057f6cd | 1541 | void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state) |
da755fdb | 1542 | { |
c4f68a13 BM |
1543 | unsigned long delay = 0; |
1544 | unsigned long holdtime; | |
1545 | unsigned long now = jiffies; | |
b3b94faa | 1546 | |
f057f6cd | 1547 | gfs2_glock_hold(gl); |
7cf8dcd3 BP |
1548 | holdtime = gl->gl_tchange + gl->gl_hold_time; |
1549 | if (test_bit(GLF_QUEUED, &gl->gl_flags) && | |
1550 | gl->gl_name.ln_type == LM_TYPE_INODE) { | |
7b5e3d5f SW |
1551 | if (time_before(now, holdtime)) |
1552 | delay = holdtime - now; | |
1553 | if (test_bit(GLF_REPLY_PENDING, &gl->gl_flags)) | |
7cf8dcd3 | 1554 | delay = gl->gl_hold_time; |
7b5e3d5f | 1555 | } |
b3b94faa | 1556 | |
f3dd1649 | 1557 | spin_lock(&gl->gl_lockref.lock); |
81ffbf65 | 1558 | handle_callback(gl, state, delay, true); |
6b0c7440 | 1559 | __gfs2_glock_queue_work(gl, delay); |
f3dd1649 | 1560 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa DT |
1561 | } |
1562 | ||
0809f6ec SW |
1563 | /** |
1564 | * gfs2_should_freeze - Figure out if glock should be frozen | |
1565 | * @gl: The glock in question | |
1566 | * | |
1567 | * Glocks are not frozen if (a) the result of the dlm operation is | |
1568 | * an error, (b) the locking operation was an unlock operation or | |
1569 | * (c) if there is a "noexp" flagged request anywhere in the queue | |
1570 | * | |
1571 | * Returns: 1 if freezing should occur, 0 otherwise | |
1572 | */ | |
1573 | ||
1574 | static int gfs2_should_freeze(const struct gfs2_glock *gl) | |
1575 | { | |
1576 | const struct gfs2_holder *gh; | |
1577 | ||
1578 | if (gl->gl_reply & ~LM_OUT_ST_MASK) | |
1579 | return 0; | |
1580 | if (gl->gl_target == LM_ST_UNLOCKED) | |
1581 | return 0; | |
1582 | ||
1583 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
1584 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
1585 | continue; | |
1586 | if (LM_FLAG_NOEXP & gh->gh_flags) | |
1587 | return 0; | |
1588 | } | |
1589 | ||
1590 | return 1; | |
1591 | } | |
1592 | ||
b3b94faa | 1593 | /** |
f057f6cd SW |
1594 | * gfs2_glock_complete - Callback used by locking |
1595 | * @gl: Pointer to the glock | |
1596 | * @ret: The return value from the dlm | |
b3b94faa | 1597 | * |
f3dd1649 | 1598 | * The gl_reply field is under the gl_lockref.lock lock so that it is ok |
47a25380 | 1599 | * to use a bitfield shared with other glock state fields. |
b3b94faa DT |
1600 | */ |
1601 | ||
f057f6cd | 1602 | void gfs2_glock_complete(struct gfs2_glock *gl, int ret) |
b3b94faa | 1603 | { |
15562c43 | 1604 | struct lm_lockstruct *ls = &gl->gl_name.ln_sbd->sd_lockstruct; |
0809f6ec | 1605 | |
f3dd1649 | 1606 | spin_lock(&gl->gl_lockref.lock); |
f057f6cd | 1607 | gl->gl_reply = ret; |
0809f6ec | 1608 | |
e0c2a9aa | 1609 | if (unlikely(test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))) { |
0809f6ec | 1610 | if (gfs2_should_freeze(gl)) { |
f057f6cd | 1611 | set_bit(GLF_FROZEN, &gl->gl_flags); |
f3dd1649 | 1612 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa | 1613 | return; |
0809f6ec | 1614 | } |
b3b94faa | 1615 | } |
47a25380 | 1616 | |
e66cf161 | 1617 | gl->gl_lockref.count++; |
f057f6cd | 1618 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
6b0c7440 | 1619 | __gfs2_glock_queue_work(gl, 0); |
f3dd1649 | 1620 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa DT |
1621 | } |
1622 | ||
4506a519 SW |
1623 | static int glock_cmp(void *priv, struct list_head *a, struct list_head *b) |
1624 | { | |
1625 | struct gfs2_glock *gla, *glb; | |
1626 | ||
1627 | gla = list_entry(a, struct gfs2_glock, gl_lru); | |
1628 | glb = list_entry(b, struct gfs2_glock, gl_lru); | |
1629 | ||
1630 | if (gla->gl_name.ln_number > glb->gl_name.ln_number) | |
1631 | return 1; | |
1632 | if (gla->gl_name.ln_number < glb->gl_name.ln_number) | |
1633 | return -1; | |
1634 | ||
1635 | return 0; | |
1636 | } | |
1637 | ||
1638 | /** | |
1639 | * gfs2_dispose_glock_lru - Demote a list of glocks | |
1640 | * @list: The list to dispose of | |
1641 | * | |
1642 | * Disposing of glocks may involve disk accesses, so that here we sort | |
1643 | * the glocks by number (i.e. disk location of the inodes) so that if | |
1644 | * there are any such accesses, they'll be sent in order (mostly). | |
1645 | * | |
1646 | * Must be called under the lru_lock, but may drop and retake this | |
1647 | * lock. While the lru_lock is dropped, entries may vanish from the | |
1648 | * list, but no new entries will appear on the list (since it is | |
1649 | * private) | |
1650 | */ | |
1651 | ||
1652 | static void gfs2_dispose_glock_lru(struct list_head *list) | |
1653 | __releases(&lru_lock) | |
1654 | __acquires(&lru_lock) | |
1655 | { | |
1656 | struct gfs2_glock *gl; | |
1657 | ||
1658 | list_sort(NULL, list, glock_cmp); | |
1659 | ||
1660 | while(!list_empty(list)) { | |
969183bc | 1661 | gl = list_first_entry(list, struct gfs2_glock, gl_lru); |
4506a519 | 1662 | list_del_init(&gl->gl_lru); |
f3dd1649 | 1663 | if (!spin_trylock(&gl->gl_lockref.lock)) { |
94a09a39 | 1664 | add_back_to_lru: |
e66cf161 | 1665 | list_add(&gl->gl_lru, &lru_list); |
7881ef3f | 1666 | set_bit(GLF_LRU, &gl->gl_flags); |
e66cf161 SW |
1667 | atomic_inc(&lru_count); |
1668 | continue; | |
1669 | } | |
94a09a39 | 1670 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) { |
f3dd1649 | 1671 | spin_unlock(&gl->gl_lockref.lock); |
94a09a39 SW |
1672 | goto add_back_to_lru; |
1673 | } | |
e66cf161 | 1674 | gl->gl_lockref.count++; |
4506a519 | 1675 | if (demote_ok(gl)) |
81ffbf65 | 1676 | handle_callback(gl, LM_ST_UNLOCKED, 0, false); |
4506a519 | 1677 | WARN_ON(!test_and_clear_bit(GLF_LOCK, &gl->gl_flags)); |
6b0c7440 | 1678 | __gfs2_glock_queue_work(gl, 0); |
f3dd1649 | 1679 | spin_unlock(&gl->gl_lockref.lock); |
94a09a39 | 1680 | cond_resched_lock(&lru_lock); |
4506a519 SW |
1681 | } |
1682 | } | |
1683 | ||
2a005855 SW |
1684 | /** |
1685 | * gfs2_scan_glock_lru - Scan the LRU looking for locks to demote | |
1686 | * @nr: The number of entries to scan | |
1687 | * | |
4506a519 SW |
1688 | * This function selects the entries on the LRU which are able to |
1689 | * be demoted, and then kicks off the process by calling | |
1690 | * gfs2_dispose_glock_lru() above. | |
2a005855 | 1691 | */ |
b3b94faa | 1692 | |
1ab6c499 | 1693 | static long gfs2_scan_glock_lru(int nr) |
b3b94faa DT |
1694 | { |
1695 | struct gfs2_glock *gl; | |
97cc1025 | 1696 | LIST_HEAD(skipped); |
4506a519 | 1697 | LIST_HEAD(dispose); |
1ab6c499 | 1698 | long freed = 0; |
b3b94faa | 1699 | |
97cc1025 | 1700 | spin_lock(&lru_lock); |
1ab6c499 | 1701 | while ((nr-- >= 0) && !list_empty(&lru_list)) { |
969183bc | 1702 | gl = list_first_entry(&lru_list, struct gfs2_glock, gl_lru); |
97cc1025 SW |
1703 | |
1704 | /* Test for being demotable */ | |
94a09a39 | 1705 | if (!test_bit(GLF_LOCK, &gl->gl_flags)) { |
4506a519 SW |
1706 | list_move(&gl->gl_lru, &dispose); |
1707 | atomic_dec(&lru_count); | |
7881ef3f | 1708 | clear_bit(GLF_LRU, &gl->gl_flags); |
1ab6c499 | 1709 | freed++; |
2163b1e6 | 1710 | continue; |
97cc1025 | 1711 | } |
4506a519 SW |
1712 | |
1713 | list_move(&gl->gl_lru, &skipped); | |
b3b94faa | 1714 | } |
97cc1025 | 1715 | list_splice(&skipped, &lru_list); |
4506a519 SW |
1716 | if (!list_empty(&dispose)) |
1717 | gfs2_dispose_glock_lru(&dispose); | |
97cc1025 | 1718 | spin_unlock(&lru_lock); |
1ab6c499 DC |
1719 | |
1720 | return freed; | |
2a005855 SW |
1721 | } |
1722 | ||
1ab6c499 DC |
1723 | static unsigned long gfs2_glock_shrink_scan(struct shrinker *shrink, |
1724 | struct shrink_control *sc) | |
2a005855 | 1725 | { |
1ab6c499 DC |
1726 | if (!(sc->gfp_mask & __GFP_FS)) |
1727 | return SHRINK_STOP; | |
1728 | return gfs2_scan_glock_lru(sc->nr_to_scan); | |
1729 | } | |
2a005855 | 1730 | |
1ab6c499 DC |
1731 | static unsigned long gfs2_glock_shrink_count(struct shrinker *shrink, |
1732 | struct shrink_control *sc) | |
1733 | { | |
55f841ce | 1734 | return vfs_pressure_ratio(atomic_read(&lru_count)); |
b3b94faa DT |
1735 | } |
1736 | ||
97cc1025 | 1737 | static struct shrinker glock_shrinker = { |
97cc1025 | 1738 | .seeks = DEFAULT_SEEKS, |
1ab6c499 DC |
1739 | .count_objects = gfs2_glock_shrink_count, |
1740 | .scan_objects = gfs2_glock_shrink_scan, | |
97cc1025 SW |
1741 | }; |
1742 | ||
b3b94faa DT |
1743 | /** |
1744 | * examine_bucket - Call a function for glock in a hash bucket | |
1745 | * @examiner: the function | |
1746 | * @sdp: the filesystem | |
1747 | * @bucket: the bucket | |
1748 | * | |
98687f42 HX |
1749 | * Note that the function can be called multiple times on the same |
1750 | * object. So the user must ensure that the function can cope with | |
1751 | * that. | |
b3b94faa DT |
1752 | */ |
1753 | ||
88ffbf3e | 1754 | static void glock_hash_walk(glock_examiner examiner, const struct gfs2_sbd *sdp) |
b3b94faa | 1755 | { |
bc015cb8 | 1756 | struct gfs2_glock *gl; |
98687f42 HX |
1757 | struct rhashtable_iter iter; |
1758 | ||
1759 | rhashtable_walk_enter(&gl_hash_table, &iter); | |
1760 | ||
1761 | do { | |
97a6ec4a | 1762 | rhashtable_walk_start(&iter); |
98687f42 HX |
1763 | |
1764 | while ((gl = rhashtable_walk_next(&iter)) && !IS_ERR(gl)) | |
27c3b415 | 1765 | if (gl->gl_name.ln_sbd == sdp && |
88ffbf3e BP |
1766 | lockref_get_not_dead(&gl->gl_lockref)) |
1767 | examiner(gl); | |
98687f42 HX |
1768 | |
1769 | rhashtable_walk_stop(&iter); | |
1770 | } while (cond_resched(), gl == ERR_PTR(-EAGAIN)); | |
1771 | ||
1772 | rhashtable_walk_exit(&iter); | |
bc015cb8 SW |
1773 | } |
1774 | ||
f057f6cd SW |
1775 | /** |
1776 | * thaw_glock - thaw out a glock which has an unprocessed reply waiting | |
1777 | * @gl: The glock to thaw | |
1778 | * | |
f057f6cd SW |
1779 | */ |
1780 | ||
1781 | static void thaw_glock(struct gfs2_glock *gl) | |
1782 | { | |
6b0c7440 | 1783 | if (!test_and_clear_bit(GLF_FROZEN, &gl->gl_flags)) { |
f057f6cd | 1784 | gfs2_glock_put(gl); |
6b0c7440 | 1785 | return; |
7286b31e | 1786 | } |
6b0c7440 AG |
1787 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
1788 | gfs2_glock_queue_work(gl, 0); | |
f057f6cd SW |
1789 | } |
1790 | ||
b3b94faa DT |
1791 | /** |
1792 | * clear_glock - look at a glock and see if we can free it from glock cache | |
1793 | * @gl: the glock to look at | |
1794 | * | |
1795 | */ | |
1796 | ||
1797 | static void clear_glock(struct gfs2_glock *gl) | |
1798 | { | |
f42ab085 | 1799 | gfs2_glock_remove_from_lru(gl); |
b3b94faa | 1800 | |
f3dd1649 | 1801 | spin_lock(&gl->gl_lockref.lock); |
c741c455 | 1802 | if (gl->gl_state != LM_ST_UNLOCKED) |
81ffbf65 | 1803 | handle_callback(gl, LM_ST_UNLOCKED, 0, false); |
6b0c7440 | 1804 | __gfs2_glock_queue_work(gl, 0); |
f3dd1649 | 1805 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa DT |
1806 | } |
1807 | ||
f057f6cd SW |
1808 | /** |
1809 | * gfs2_glock_thaw - Thaw any frozen glocks | |
1810 | * @sdp: The super block | |
1811 | * | |
1812 | */ | |
1813 | ||
1814 | void gfs2_glock_thaw(struct gfs2_sbd *sdp) | |
1815 | { | |
bc015cb8 SW |
1816 | glock_hash_walk(thaw_glock, sdp); |
1817 | } | |
f057f6cd | 1818 | |
3792ce97 | 1819 | static void dump_glock(struct seq_file *seq, struct gfs2_glock *gl, bool fsid) |
bc015cb8 | 1820 | { |
f3dd1649 | 1821 | spin_lock(&gl->gl_lockref.lock); |
3792ce97 | 1822 | gfs2_dump_glock(seq, gl, fsid); |
f3dd1649 | 1823 | spin_unlock(&gl->gl_lockref.lock); |
bc015cb8 SW |
1824 | } |
1825 | ||
1826 | static void dump_glock_func(struct gfs2_glock *gl) | |
1827 | { | |
3792ce97 | 1828 | dump_glock(NULL, gl, true); |
f057f6cd SW |
1829 | } |
1830 | ||
b3b94faa DT |
1831 | /** |
1832 | * gfs2_gl_hash_clear - Empty out the glock hash table | |
1833 | * @sdp: the filesystem | |
1834 | * @wait: wait until it's all gone | |
1835 | * | |
1bdad606 | 1836 | * Called when unmounting the filesystem. |
b3b94faa DT |
1837 | */ |
1838 | ||
fefc03bf | 1839 | void gfs2_gl_hash_clear(struct gfs2_sbd *sdp) |
b3b94faa | 1840 | { |
fb6791d1 | 1841 | set_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags); |
222cb538 | 1842 | flush_workqueue(glock_workqueue); |
bc015cb8 | 1843 | glock_hash_walk(clear_glock, sdp); |
8f05228e | 1844 | flush_workqueue(glock_workqueue); |
2aba1b5b BP |
1845 | wait_event_timeout(sdp->sd_glock_wait, |
1846 | atomic_read(&sdp->sd_glock_disposal) == 0, | |
1847 | HZ * 600); | |
bc015cb8 | 1848 | glock_hash_walk(dump_glock_func, sdp); |
b3b94faa DT |
1849 | } |
1850 | ||
813e0c46 SW |
1851 | void gfs2_glock_finish_truncate(struct gfs2_inode *ip) |
1852 | { | |
1853 | struct gfs2_glock *gl = ip->i_gl; | |
1854 | int ret; | |
1855 | ||
1856 | ret = gfs2_truncatei_resume(ip); | |
15562c43 | 1857 | gfs2_assert_withdraw(gl->gl_name.ln_sbd, ret == 0); |
813e0c46 | 1858 | |
f3dd1649 | 1859 | spin_lock(&gl->gl_lockref.lock); |
813e0c46 SW |
1860 | clear_bit(GLF_LOCK, &gl->gl_flags); |
1861 | run_queue(gl, 1); | |
f3dd1649 | 1862 | spin_unlock(&gl->gl_lockref.lock); |
813e0c46 SW |
1863 | } |
1864 | ||
6802e340 | 1865 | static const char *state2str(unsigned state) |
04b933f2 | 1866 | { |
6802e340 SW |
1867 | switch(state) { |
1868 | case LM_ST_UNLOCKED: | |
1869 | return "UN"; | |
1870 | case LM_ST_SHARED: | |
1871 | return "SH"; | |
1872 | case LM_ST_DEFERRED: | |
1873 | return "DF"; | |
1874 | case LM_ST_EXCLUSIVE: | |
1875 | return "EX"; | |
1876 | } | |
1877 | return "??"; | |
1878 | } | |
1879 | ||
b58bf407 | 1880 | static const char *hflags2str(char *buf, u16 flags, unsigned long iflags) |
6802e340 SW |
1881 | { |
1882 | char *p = buf; | |
1883 | if (flags & LM_FLAG_TRY) | |
1884 | *p++ = 't'; | |
1885 | if (flags & LM_FLAG_TRY_1CB) | |
1886 | *p++ = 'T'; | |
1887 | if (flags & LM_FLAG_NOEXP) | |
1888 | *p++ = 'e'; | |
1889 | if (flags & LM_FLAG_ANY) | |
f057f6cd | 1890 | *p++ = 'A'; |
6802e340 SW |
1891 | if (flags & LM_FLAG_PRIORITY) |
1892 | *p++ = 'p'; | |
1893 | if (flags & GL_ASYNC) | |
1894 | *p++ = 'a'; | |
1895 | if (flags & GL_EXACT) | |
1896 | *p++ = 'E'; | |
6802e340 SW |
1897 | if (flags & GL_NOCACHE) |
1898 | *p++ = 'c'; | |
1899 | if (test_bit(HIF_HOLDER, &iflags)) | |
1900 | *p++ = 'H'; | |
1901 | if (test_bit(HIF_WAIT, &iflags)) | |
1902 | *p++ = 'W'; | |
1903 | if (test_bit(HIF_FIRST, &iflags)) | |
1904 | *p++ = 'F'; | |
1905 | *p = 0; | |
1906 | return buf; | |
04b933f2 RP |
1907 | } |
1908 | ||
b3b94faa DT |
1909 | /** |
1910 | * dump_holder - print information about a glock holder | |
6802e340 | 1911 | * @seq: the seq_file struct |
b3b94faa | 1912 | * @gh: the glock holder |
3792ce97 | 1913 | * @fs_id_buf: pointer to file system id (if requested) |
b3b94faa | 1914 | * |
b3b94faa DT |
1915 | */ |
1916 | ||
3792ce97 BP |
1917 | static void dump_holder(struct seq_file *seq, const struct gfs2_holder *gh, |
1918 | const char *fs_id_buf) | |
b3b94faa | 1919 | { |
6802e340 | 1920 | struct task_struct *gh_owner = NULL; |
6802e340 | 1921 | char flags_buf[32]; |
b3b94faa | 1922 | |
0b3a2c99 | 1923 | rcu_read_lock(); |
6802e340 | 1924 | if (gh->gh_owner_pid) |
b1e058da | 1925 | gh_owner = pid_task(gh->gh_owner_pid, PIDTYPE_PID); |
3792ce97 BP |
1926 | gfs2_print_dbg(seq, "%s H: s:%s f:%s e:%d p:%ld [%s] %pS\n", |
1927 | fs_id_buf, state2str(gh->gh_state), | |
cc18152e JP |
1928 | hflags2str(flags_buf, gh->gh_flags, gh->gh_iflags), |
1929 | gh->gh_error, | |
1930 | gh->gh_owner_pid ? (long)pid_nr(gh->gh_owner_pid) : -1, | |
1931 | gh_owner ? gh_owner->comm : "(ended)", | |
1932 | (void *)gh->gh_ip); | |
0b3a2c99 | 1933 | rcu_read_unlock(); |
b3b94faa DT |
1934 | } |
1935 | ||
627c10b7 | 1936 | static const char *gflags2str(char *buf, const struct gfs2_glock *gl) |
6802e340 | 1937 | { |
627c10b7 | 1938 | const unsigned long *gflags = &gl->gl_flags; |
6802e340 | 1939 | char *p = buf; |
627c10b7 | 1940 | |
6802e340 SW |
1941 | if (test_bit(GLF_LOCK, gflags)) |
1942 | *p++ = 'l'; | |
6802e340 SW |
1943 | if (test_bit(GLF_DEMOTE, gflags)) |
1944 | *p++ = 'D'; | |
1945 | if (test_bit(GLF_PENDING_DEMOTE, gflags)) | |
1946 | *p++ = 'd'; | |
1947 | if (test_bit(GLF_DEMOTE_IN_PROGRESS, gflags)) | |
1948 | *p++ = 'p'; | |
1949 | if (test_bit(GLF_DIRTY, gflags)) | |
1950 | *p++ = 'y'; | |
1951 | if (test_bit(GLF_LFLUSH, gflags)) | |
1952 | *p++ = 'f'; | |
1953 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, gflags)) | |
1954 | *p++ = 'i'; | |
1955 | if (test_bit(GLF_REPLY_PENDING, gflags)) | |
1956 | *p++ = 'r'; | |
f057f6cd | 1957 | if (test_bit(GLF_INITIAL, gflags)) |
d8348de0 | 1958 | *p++ = 'I'; |
f057f6cd SW |
1959 | if (test_bit(GLF_FROZEN, gflags)) |
1960 | *p++ = 'F'; | |
7b5e3d5f SW |
1961 | if (test_bit(GLF_QUEUED, gflags)) |
1962 | *p++ = 'q'; | |
627c10b7 SW |
1963 | if (test_bit(GLF_LRU, gflags)) |
1964 | *p++ = 'L'; | |
1965 | if (gl->gl_object) | |
1966 | *p++ = 'o'; | |
a245769f SW |
1967 | if (test_bit(GLF_BLOCKING, gflags)) |
1968 | *p++ = 'b'; | |
6802e340 SW |
1969 | *p = 0; |
1970 | return buf; | |
b3b94faa DT |
1971 | } |
1972 | ||
1973 | /** | |
8eae1ca0 | 1974 | * gfs2_dump_glock - print information about a glock |
6802e340 | 1975 | * @seq: The seq_file struct |
b3b94faa | 1976 | * @gl: the glock |
3792ce97 | 1977 | * @fsid: If true, also dump the file system id |
6802e340 SW |
1978 | * |
1979 | * The file format is as follows: | |
1980 | * One line per object, capital letters are used to indicate objects | |
1981 | * G = glock, I = Inode, R = rgrp, H = holder. Glocks are not indented, | |
1982 | * other objects are indented by a single space and follow the glock to | |
1983 | * which they are related. Fields are indicated by lower case letters | |
1984 | * followed by a colon and the field value, except for strings which are in | |
1985 | * [] so that its possible to see if they are composed of spaces for | |
1986 | * example. The field's are n = number (id of the object), f = flags, | |
1987 | * t = type, s = state, r = refcount, e = error, p = pid. | |
b3b94faa | 1988 | * |
b3b94faa DT |
1989 | */ |
1990 | ||
3792ce97 | 1991 | void gfs2_dump_glock(struct seq_file *seq, struct gfs2_glock *gl, bool fsid) |
b3b94faa | 1992 | { |
6802e340 SW |
1993 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
1994 | unsigned long long dtime; | |
1995 | const struct gfs2_holder *gh; | |
1996 | char gflags_buf[32]; | |
3792ce97 | 1997 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
98fb0574 | 1998 | char fs_id_buf[sizeof(sdp->sd_fsname) + 7]; |
b3b94faa | 1999 | |
3792ce97 BP |
2000 | memset(fs_id_buf, 0, sizeof(fs_id_buf)); |
2001 | if (fsid && sdp) /* safety precaution */ | |
2002 | sprintf(fs_id_buf, "fsid=%s: ", sdp->sd_fsname); | |
6802e340 SW |
2003 | dtime = jiffies - gl->gl_demote_time; |
2004 | dtime *= 1000000/HZ; /* demote time in uSec */ | |
2005 | if (!test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
2006 | dtime = 0; | |
3792ce97 BP |
2007 | gfs2_print_dbg(seq, "%sG: s:%s n:%u/%llx f:%s t:%s d:%s/%llu a:%d " |
2008 | "v:%d r:%d m:%ld\n", fs_id_buf, state2str(gl->gl_state), | |
6802e340 SW |
2009 | gl->gl_name.ln_type, |
2010 | (unsigned long long)gl->gl_name.ln_number, | |
627c10b7 | 2011 | gflags2str(gflags_buf, gl), |
6802e340 SW |
2012 | state2str(gl->gl_target), |
2013 | state2str(gl->gl_demote_state), dtime, | |
6802e340 | 2014 | atomic_read(&gl->gl_ail_count), |
638803d4 | 2015 | atomic_read(&gl->gl_revokes), |
e66cf161 | 2016 | (int)gl->gl_lockref.count, gl->gl_hold_time); |
b3b94faa | 2017 | |
ac3beb6a | 2018 | list_for_each_entry(gh, &gl->gl_holders, gh_list) |
3792ce97 | 2019 | dump_holder(seq, gh, fs_id_buf); |
ac3beb6a | 2020 | |
6802e340 | 2021 | if (gl->gl_state != LM_ST_UNLOCKED && glops->go_dump) |
3792ce97 | 2022 | glops->go_dump(seq, gl, fs_id_buf); |
b3b94faa DT |
2023 | } |
2024 | ||
a245769f SW |
2025 | static int gfs2_glstats_seq_show(struct seq_file *seq, void *iter_ptr) |
2026 | { | |
2027 | struct gfs2_glock *gl = iter_ptr; | |
2028 | ||
4d207133 | 2029 | seq_printf(seq, "G: n:%u/%llx rtt:%llu/%llu rttb:%llu/%llu irt:%llu/%llu dcnt: %llu qcnt: %llu\n", |
a245769f SW |
2030 | gl->gl_name.ln_type, |
2031 | (unsigned long long)gl->gl_name.ln_number, | |
4d207133 BH |
2032 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTT], |
2033 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTVAR], | |
2034 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTB], | |
2035 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTVARB], | |
2036 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SIRT], | |
2037 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SIRTVAR], | |
2038 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_DCOUNT], | |
2039 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_QCOUNT]); | |
a245769f SW |
2040 | return 0; |
2041 | } | |
2042 | ||
2043 | static const char *gfs2_gltype[] = { | |
2044 | "type", | |
2045 | "reserved", | |
2046 | "nondisk", | |
2047 | "inode", | |
2048 | "rgrp", | |
2049 | "meta", | |
2050 | "iopen", | |
2051 | "flock", | |
2052 | "plock", | |
2053 | "quota", | |
2054 | "journal", | |
2055 | }; | |
2056 | ||
2057 | static const char *gfs2_stype[] = { | |
2058 | [GFS2_LKS_SRTT] = "srtt", | |
2059 | [GFS2_LKS_SRTTVAR] = "srttvar", | |
2060 | [GFS2_LKS_SRTTB] = "srttb", | |
2061 | [GFS2_LKS_SRTTVARB] = "srttvarb", | |
2062 | [GFS2_LKS_SIRT] = "sirt", | |
2063 | [GFS2_LKS_SIRTVAR] = "sirtvar", | |
2064 | [GFS2_LKS_DCOUNT] = "dlm", | |
2065 | [GFS2_LKS_QCOUNT] = "queue", | |
2066 | }; | |
2067 | ||
2068 | #define GFS2_NR_SBSTATS (ARRAY_SIZE(gfs2_gltype) * ARRAY_SIZE(gfs2_stype)) | |
2069 | ||
2070 | static int gfs2_sbstats_seq_show(struct seq_file *seq, void *iter_ptr) | |
2071 | { | |
81648d04 AG |
2072 | struct gfs2_sbd *sdp = seq->private; |
2073 | loff_t pos = *(loff_t *)iter_ptr; | |
2074 | unsigned index = pos >> 3; | |
2075 | unsigned subindex = pos & 0x07; | |
a245769f SW |
2076 | int i; |
2077 | ||
2078 | if (index == 0 && subindex != 0) | |
2079 | return 0; | |
6802e340 | 2080 | |
a245769f SW |
2081 | seq_printf(seq, "%-10s %8s:", gfs2_gltype[index], |
2082 | (index == 0) ? "cpu": gfs2_stype[subindex]); | |
b3b94faa | 2083 | |
a245769f SW |
2084 | for_each_possible_cpu(i) { |
2085 | const struct gfs2_pcpu_lkstats *lkstats = per_cpu_ptr(sdp->sd_lkstats, i); | |
8f7e0a80 AG |
2086 | |
2087 | if (index == 0) | |
2088 | seq_printf(seq, " %15u", i); | |
2089 | else | |
2090 | seq_printf(seq, " %15llu", (unsigned long long)lkstats-> | |
2091 | lkstats[index - 1].stats[subindex]); | |
a245769f SW |
2092 | } |
2093 | seq_putc(seq, '\n'); | |
2094 | return 0; | |
2095 | } | |
8fbbfd21 | 2096 | |
85d1da67 SW |
2097 | int __init gfs2_glock_init(void) |
2098 | { | |
0515480a | 2099 | int i, ret; |
88ffbf3e BP |
2100 | |
2101 | ret = rhashtable_init(&gl_hash_table, &ht_parms); | |
2102 | if (ret < 0) | |
2103 | return ret; | |
8fbbfd21 | 2104 | |
d2115778 | 2105 | glock_workqueue = alloc_workqueue("glock_workqueue", WQ_MEM_RECLAIM | |
58a69cb4 | 2106 | WQ_HIGHPRI | WQ_FREEZABLE, 0); |
88ffbf3e BP |
2107 | if (!glock_workqueue) { |
2108 | rhashtable_destroy(&gl_hash_table); | |
dfc4616d | 2109 | return -ENOMEM; |
88ffbf3e | 2110 | } |
d2115778 | 2111 | gfs2_delete_workqueue = alloc_workqueue("delete_workqueue", |
58a69cb4 | 2112 | WQ_MEM_RECLAIM | WQ_FREEZABLE, |
d2115778 | 2113 | 0); |
dfc4616d | 2114 | if (!gfs2_delete_workqueue) { |
b94a170e | 2115 | destroy_workqueue(glock_workqueue); |
88ffbf3e | 2116 | rhashtable_destroy(&gl_hash_table); |
dfc4616d | 2117 | return -ENOMEM; |
b94a170e | 2118 | } |
97cc1025 | 2119 | |
e0d735c1 CY |
2120 | ret = register_shrinker(&glock_shrinker); |
2121 | if (ret) { | |
2122 | destroy_workqueue(gfs2_delete_workqueue); | |
2123 | destroy_workqueue(glock_workqueue); | |
2124 | rhashtable_destroy(&gl_hash_table); | |
2125 | return ret; | |
2126 | } | |
c4f68a13 | 2127 | |
0515480a AG |
2128 | for (i = 0; i < GLOCK_WAIT_TABLE_SIZE; i++) |
2129 | init_waitqueue_head(glock_wait_table + i); | |
2130 | ||
85d1da67 SW |
2131 | return 0; |
2132 | } | |
2133 | ||
8fbbfd21 SW |
2134 | void gfs2_glock_exit(void) |
2135 | { | |
97cc1025 | 2136 | unregister_shrinker(&glock_shrinker); |
88ffbf3e | 2137 | rhashtable_destroy(&gl_hash_table); |
c4f68a13 | 2138 | destroy_workqueue(glock_workqueue); |
b94a170e | 2139 | destroy_workqueue(gfs2_delete_workqueue); |
8fbbfd21 SW |
2140 | } |
2141 | ||
7ac07fda | 2142 | static void gfs2_glock_iter_next(struct gfs2_glock_iter *gi, loff_t n) |
bc015cb8 | 2143 | { |
3fd5d3ad AG |
2144 | struct gfs2_glock *gl = gi->gl; |
2145 | ||
2146 | if (gl) { | |
2147 | if (n == 0) | |
2148 | return; | |
2149 | if (!lockref_put_not_zero(&gl->gl_lockref)) | |
2150 | gfs2_glock_queue_put(gl); | |
7ac07fda AG |
2151 | } |
2152 | for (;;) { | |
3fd5d3ad AG |
2153 | gl = rhashtable_walk_next(&gi->hti); |
2154 | if (IS_ERR_OR_NULL(gl)) { | |
2155 | if (gl == ERR_PTR(-EAGAIN)) { | |
2156 | n = 1; | |
2157 | continue; | |
7ac07fda | 2158 | } |
3fd5d3ad AG |
2159 | gl = NULL; |
2160 | break; | |
2161 | } | |
2162 | if (gl->gl_name.ln_sbd != gi->sdp) | |
2163 | continue; | |
2164 | if (n <= 1) { | |
2165 | if (!lockref_get_not_dead(&gl->gl_lockref)) | |
2166 | continue; | |
2167 | break; | |
2168 | } else { | |
2169 | if (__lockref_is_dead(&gl->gl_lockref)) | |
2170 | continue; | |
2171 | n--; | |
bc015cb8 | 2172 | } |
14d37564 | 2173 | } |
3fd5d3ad | 2174 | gi->gl = gl; |
7c52b166 RP |
2175 | } |
2176 | ||
6802e340 | 2177 | static void *gfs2_glock_seq_start(struct seq_file *seq, loff_t *pos) |
27c3b415 | 2178 | __acquires(RCU) |
7c52b166 | 2179 | { |
6802e340 | 2180 | struct gfs2_glock_iter *gi = seq->private; |
7ac07fda | 2181 | loff_t n; |
ba1ddcb6 | 2182 | |
7ac07fda AG |
2183 | /* |
2184 | * We can either stay where we are, skip to the next hash table | |
2185 | * entry, or start from the beginning. | |
2186 | */ | |
2187 | if (*pos < gi->last_pos) { | |
2188 | rhashtable_walk_exit(&gi->hti); | |
2189 | rhashtable_walk_enter(&gl_hash_table, &gi->hti); | |
2190 | n = *pos + 1; | |
2191 | } else { | |
2192 | n = *pos - gi->last_pos; | |
2193 | } | |
7c52b166 | 2194 | |
7ac07fda | 2195 | rhashtable_walk_start(&gi->hti); |
7c52b166 | 2196 | |
7ac07fda | 2197 | gfs2_glock_iter_next(gi, n); |
ba1ddcb6 | 2198 | gi->last_pos = *pos; |
6802e340 | 2199 | return gi->gl; |
7c52b166 RP |
2200 | } |
2201 | ||
6802e340 | 2202 | static void *gfs2_glock_seq_next(struct seq_file *seq, void *iter_ptr, |
7c52b166 RP |
2203 | loff_t *pos) |
2204 | { | |
6802e340 | 2205 | struct gfs2_glock_iter *gi = seq->private; |
7c52b166 RP |
2206 | |
2207 | (*pos)++; | |
ba1ddcb6 | 2208 | gi->last_pos = *pos; |
7ac07fda | 2209 | gfs2_glock_iter_next(gi, 1); |
6802e340 | 2210 | return gi->gl; |
7c52b166 RP |
2211 | } |
2212 | ||
6802e340 | 2213 | static void gfs2_glock_seq_stop(struct seq_file *seq, void *iter_ptr) |
27c3b415 | 2214 | __releases(RCU) |
7c52b166 | 2215 | { |
6802e340 | 2216 | struct gfs2_glock_iter *gi = seq->private; |
bc015cb8 | 2217 | |
88ffbf3e | 2218 | rhashtable_walk_stop(&gi->hti); |
7c52b166 RP |
2219 | } |
2220 | ||
6802e340 | 2221 | static int gfs2_glock_seq_show(struct seq_file *seq, void *iter_ptr) |
7c52b166 | 2222 | { |
3792ce97 | 2223 | dump_glock(seq, iter_ptr, false); |
ac3beb6a | 2224 | return 0; |
7c52b166 RP |
2225 | } |
2226 | ||
a245769f SW |
2227 | static void *gfs2_sbstats_seq_start(struct seq_file *seq, loff_t *pos) |
2228 | { | |
81648d04 | 2229 | preempt_disable(); |
a245769f SW |
2230 | if (*pos >= GFS2_NR_SBSTATS) |
2231 | return NULL; | |
81648d04 | 2232 | return pos; |
a245769f SW |
2233 | } |
2234 | ||
2235 | static void *gfs2_sbstats_seq_next(struct seq_file *seq, void *iter_ptr, | |
2236 | loff_t *pos) | |
2237 | { | |
a245769f | 2238 | (*pos)++; |
81648d04 | 2239 | if (*pos >= GFS2_NR_SBSTATS) |
a245769f | 2240 | return NULL; |
81648d04 | 2241 | return pos; |
a245769f SW |
2242 | } |
2243 | ||
2244 | static void gfs2_sbstats_seq_stop(struct seq_file *seq, void *iter_ptr) | |
2245 | { | |
2246 | preempt_enable(); | |
2247 | } | |
2248 | ||
4ef29002 | 2249 | static const struct seq_operations gfs2_glock_seq_ops = { |
7c52b166 RP |
2250 | .start = gfs2_glock_seq_start, |
2251 | .next = gfs2_glock_seq_next, | |
2252 | .stop = gfs2_glock_seq_stop, | |
2253 | .show = gfs2_glock_seq_show, | |
2254 | }; | |
2255 | ||
a245769f SW |
2256 | static const struct seq_operations gfs2_glstats_seq_ops = { |
2257 | .start = gfs2_glock_seq_start, | |
2258 | .next = gfs2_glock_seq_next, | |
2259 | .stop = gfs2_glock_seq_stop, | |
2260 | .show = gfs2_glstats_seq_show, | |
2261 | }; | |
2262 | ||
2263 | static const struct seq_operations gfs2_sbstats_seq_ops = { | |
2264 | .start = gfs2_sbstats_seq_start, | |
2265 | .next = gfs2_sbstats_seq_next, | |
2266 | .stop = gfs2_sbstats_seq_stop, | |
2267 | .show = gfs2_sbstats_seq_show, | |
2268 | }; | |
2269 | ||
0fe2f1e9 SW |
2270 | #define GFS2_SEQ_GOODSIZE min(PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER, 65536UL) |
2271 | ||
92ecd73a AG |
2272 | static int __gfs2_glocks_open(struct inode *inode, struct file *file, |
2273 | const struct seq_operations *ops) | |
7c52b166 | 2274 | { |
92ecd73a | 2275 | int ret = seq_open_private(file, ops, sizeof(struct gfs2_glock_iter)); |
6802e340 SW |
2276 | if (ret == 0) { |
2277 | struct seq_file *seq = file->private_data; | |
2278 | struct gfs2_glock_iter *gi = seq->private; | |
88ffbf3e | 2279 | |
6802e340 | 2280 | gi->sdp = inode->i_private; |
0fe2f1e9 | 2281 | seq->buf = kmalloc(GFS2_SEQ_GOODSIZE, GFP_KERNEL | __GFP_NOWARN); |
df5d2f55 | 2282 | if (seq->buf) |
0fe2f1e9 | 2283 | seq->size = GFS2_SEQ_GOODSIZE; |
7ac07fda AG |
2284 | /* |
2285 | * Initially, we are "before" the first hash table entry; the | |
2286 | * first call to rhashtable_walk_next gets us the first entry. | |
2287 | */ | |
2288 | gi->last_pos = -1; | |
88ffbf3e | 2289 | gi->gl = NULL; |
7ac07fda | 2290 | rhashtable_walk_enter(&gl_hash_table, &gi->hti); |
6802e340 SW |
2291 | } |
2292 | return ret; | |
7c52b166 RP |
2293 | } |
2294 | ||
92ecd73a AG |
2295 | static int gfs2_glocks_open(struct inode *inode, struct file *file) |
2296 | { | |
2297 | return __gfs2_glocks_open(inode, file, &gfs2_glock_seq_ops); | |
2298 | } | |
2299 | ||
88ffbf3e BP |
2300 | static int gfs2_glocks_release(struct inode *inode, struct file *file) |
2301 | { | |
2302 | struct seq_file *seq = file->private_data; | |
2303 | struct gfs2_glock_iter *gi = seq->private; | |
2304 | ||
3fd5d3ad AG |
2305 | if (gi->gl) |
2306 | gfs2_glock_put(gi->gl); | |
7ac07fda | 2307 | rhashtable_walk_exit(&gi->hti); |
88ffbf3e BP |
2308 | return seq_release_private(inode, file); |
2309 | } | |
2310 | ||
a245769f SW |
2311 | static int gfs2_glstats_open(struct inode *inode, struct file *file) |
2312 | { | |
92ecd73a | 2313 | return __gfs2_glocks_open(inode, file, &gfs2_glstats_seq_ops); |
a245769f SW |
2314 | } |
2315 | ||
2316 | static int gfs2_sbstats_open(struct inode *inode, struct file *file) | |
2317 | { | |
81648d04 | 2318 | int ret = seq_open(file, &gfs2_sbstats_seq_ops); |
a245769f SW |
2319 | if (ret == 0) { |
2320 | struct seq_file *seq = file->private_data; | |
81648d04 | 2321 | seq->private = inode->i_private; /* sdp */ |
a245769f SW |
2322 | } |
2323 | return ret; | |
2324 | } | |
2325 | ||
2326 | static const struct file_operations gfs2_glocks_fops = { | |
2327 | .owner = THIS_MODULE, | |
2328 | .open = gfs2_glocks_open, | |
2329 | .read = seq_read, | |
2330 | .llseek = seq_lseek, | |
88ffbf3e | 2331 | .release = gfs2_glocks_release, |
a245769f SW |
2332 | }; |
2333 | ||
2334 | static const struct file_operations gfs2_glstats_fops = { | |
7c52b166 | 2335 | .owner = THIS_MODULE, |
a245769f SW |
2336 | .open = gfs2_glstats_open, |
2337 | .read = seq_read, | |
2338 | .llseek = seq_lseek, | |
88ffbf3e | 2339 | .release = gfs2_glocks_release, |
a245769f SW |
2340 | }; |
2341 | ||
2342 | static const struct file_operations gfs2_sbstats_fops = { | |
2343 | .owner = THIS_MODULE, | |
2344 | .open = gfs2_sbstats_open, | |
7c52b166 RP |
2345 | .read = seq_read, |
2346 | .llseek = seq_lseek, | |
81648d04 | 2347 | .release = seq_release, |
7c52b166 RP |
2348 | }; |
2349 | ||
2abbf9a4 GKH |
2350 | void gfs2_create_debugfs_file(struct gfs2_sbd *sdp) |
2351 | { | |
2352 | sdp->debugfs_dir = debugfs_create_dir(sdp->sd_table_name, gfs2_root); | |
7c52b166 | 2353 | |
2abbf9a4 GKH |
2354 | debugfs_create_file("glocks", S_IFREG | S_IRUGO, sdp->debugfs_dir, sdp, |
2355 | &gfs2_glocks_fops); | |
2356 | ||
2357 | debugfs_create_file("glstats", S_IFREG | S_IRUGO, sdp->debugfs_dir, sdp, | |
2358 | &gfs2_glstats_fops); | |
2359 | ||
2360 | debugfs_create_file("sbstats", S_IFREG | S_IRUGO, sdp->debugfs_dir, sdp, | |
2361 | &gfs2_sbstats_fops); | |
7c52b166 RP |
2362 | } |
2363 | ||
2364 | void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp) | |
2365 | { | |
2abbf9a4 GKH |
2366 | debugfs_remove_recursive(sdp->debugfs_dir); |
2367 | sdp->debugfs_dir = NULL; | |
7c52b166 RP |
2368 | } |
2369 | ||
2abbf9a4 | 2370 | void gfs2_register_debugfs(void) |
7c52b166 RP |
2371 | { |
2372 | gfs2_root = debugfs_create_dir("gfs2", NULL); | |
7c52b166 RP |
2373 | } |
2374 | ||
2375 | void gfs2_unregister_debugfs(void) | |
2376 | { | |
2377 | debugfs_remove(gfs2_root); | |
5f882096 | 2378 | gfs2_root = NULL; |
7c52b166 | 2379 | } |