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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 | ||
ea4e61c7 | 166 | gfs2_glock_assert_withdraw(gl, atomic_read(&gl->gl_revokes) == 0); |
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 | ||
38a618db | 215 | list_move_tail(&gl->gl_lru, &lru_list); |
7881ef3f RL |
216 | |
217 | if (!test_bit(GLF_LRU, &gl->gl_flags)) { | |
218 | set_bit(GLF_LRU, &gl->gl_flags); | |
29687a2a | 219 | atomic_inc(&lru_count); |
7881ef3f | 220 | } |
29687a2a | 221 | |
29687a2a SW |
222 | spin_unlock(&lru_lock); |
223 | } | |
224 | ||
8f6cb409 | 225 | static void gfs2_glock_remove_from_lru(struct gfs2_glock *gl) |
f42ab085 | 226 | { |
645ebd49 BP |
227 | if (!(gl->gl_ops->go_flags & GLOF_LRU)) |
228 | return; | |
229 | ||
8f6cb409 | 230 | spin_lock(&lru_lock); |
7881ef3f | 231 | if (test_bit(GLF_LRU, &gl->gl_flags)) { |
f42ab085 SW |
232 | list_del_init(&gl->gl_lru); |
233 | atomic_dec(&lru_count); | |
234 | clear_bit(GLF_LRU, &gl->gl_flags); | |
235 | } | |
236 | spin_unlock(&lru_lock); | |
237 | } | |
238 | ||
6b0c7440 AG |
239 | /* |
240 | * Enqueue the glock on the work queue. Passes one glock reference on to the | |
241 | * work queue. | |
b3b94faa | 242 | */ |
6b0c7440 AG |
243 | static void __gfs2_glock_queue_work(struct gfs2_glock *gl, unsigned long delay) { |
244 | if (!queue_delayed_work(glock_workqueue, &gl->gl_work, delay)) { | |
245 | /* | |
246 | * We are holding the lockref spinlock, and the work was still | |
247 | * queued above. The queued work (glock_work_func) takes that | |
248 | * spinlock before dropping its glock reference(s), so it | |
249 | * cannot have dropped them in the meantime. | |
250 | */ | |
251 | GLOCK_BUG_ON(gl, gl->gl_lockref.count < 2); | |
252 | gl->gl_lockref.count--; | |
253 | } | |
254 | } | |
b3b94faa | 255 | |
6b0c7440 AG |
256 | static void gfs2_glock_queue_work(struct gfs2_glock *gl, unsigned long delay) { |
257 | spin_lock(&gl->gl_lockref.lock); | |
258 | __gfs2_glock_queue_work(gl, delay); | |
259 | spin_unlock(&gl->gl_lockref.lock); | |
260 | } | |
261 | ||
262 | static void __gfs2_glock_put(struct gfs2_glock *gl) | |
b3b94faa | 263 | { |
15562c43 | 264 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
bc015cb8 | 265 | struct address_space *mapping = gfs2_glock2aspace(gl); |
b3b94faa | 266 | |
e66cf161 SW |
267 | lockref_mark_dead(&gl->gl_lockref); |
268 | ||
8f6cb409 | 269 | gfs2_glock_remove_from_lru(gl); |
e66cf161 | 270 | spin_unlock(&gl->gl_lockref.lock); |
e66cf161 | 271 | GLOCK_BUG_ON(gl, !list_empty(&gl->gl_holders)); |
ee1e2c77 BP |
272 | if (mapping) { |
273 | truncate_inode_pages_final(mapping); | |
274 | if (!gfs2_withdrawn(sdp)) | |
7716506a | 275 | GLOCK_BUG_ON(gl, !mapping_empty(mapping)); |
ee1e2c77 | 276 | } |
e66cf161 SW |
277 | trace_gfs2_glock_put(gl); |
278 | sdp->sd_lockstruct.ls_ops->lm_put_lock(gl); | |
b3b94faa DT |
279 | } |
280 | ||
71c1b213 AG |
281 | /* |
282 | * Cause the glock to be put in work queue context. | |
283 | */ | |
284 | void gfs2_glock_queue_put(struct gfs2_glock *gl) | |
285 | { | |
286 | gfs2_glock_queue_work(gl, 0); | |
287 | } | |
288 | ||
6b0c7440 AG |
289 | /** |
290 | * gfs2_glock_put() - Decrement reference count on glock | |
291 | * @gl: The glock to put | |
292 | * | |
293 | */ | |
294 | ||
295 | void gfs2_glock_put(struct gfs2_glock *gl) | |
296 | { | |
297 | if (lockref_put_or_lock(&gl->gl_lockref)) | |
298 | return; | |
299 | ||
300 | __gfs2_glock_put(gl); | |
301 | } | |
302 | ||
6802e340 SW |
303 | /** |
304 | * may_grant - check if its ok to grant a new lock | |
305 | * @gl: The glock | |
306 | * @gh: The lock request which we wish to grant | |
307 | * | |
308 | * Returns: true if its ok to grant the lock | |
309 | */ | |
310 | ||
311 | static inline int may_grant(const struct gfs2_glock *gl, const struct gfs2_holder *gh) | |
312 | { | |
969183bc | 313 | const struct gfs2_holder *gh_head = list_first_entry(&gl->gl_holders, const struct gfs2_holder, gh_list); |
06e908cd BP |
314 | |
315 | if (gh != gh_head) { | |
316 | /** | |
317 | * Here we make a special exception to grant holders who agree | |
318 | * to share the EX lock with other holders who also have the | |
319 | * bit set. If the original holder has the LM_FLAG_NODE_SCOPE bit | |
320 | * is set, we grant more holders with the bit set. | |
321 | */ | |
322 | if (gh_head->gh_state == LM_ST_EXCLUSIVE && | |
323 | (gh_head->gh_flags & LM_FLAG_NODE_SCOPE) && | |
324 | gh->gh_state == LM_ST_EXCLUSIVE && | |
325 | (gh->gh_flags & LM_FLAG_NODE_SCOPE)) | |
326 | return 1; | |
327 | if ((gh->gh_state == LM_ST_EXCLUSIVE || | |
328 | gh_head->gh_state == LM_ST_EXCLUSIVE)) | |
329 | return 0; | |
330 | } | |
6802e340 SW |
331 | if (gl->gl_state == gh->gh_state) |
332 | return 1; | |
333 | if (gh->gh_flags & GL_EXACT) | |
334 | return 0; | |
209806ab SW |
335 | if (gl->gl_state == LM_ST_EXCLUSIVE) { |
336 | if (gh->gh_state == LM_ST_SHARED && gh_head->gh_state == LM_ST_SHARED) | |
337 | return 1; | |
338 | if (gh->gh_state == LM_ST_DEFERRED && gh_head->gh_state == LM_ST_DEFERRED) | |
339 | return 1; | |
340 | } | |
6802e340 SW |
341 | if (gl->gl_state != LM_ST_UNLOCKED && (gh->gh_flags & LM_FLAG_ANY)) |
342 | return 1; | |
343 | return 0; | |
344 | } | |
345 | ||
346 | static void gfs2_holder_wake(struct gfs2_holder *gh) | |
347 | { | |
348 | clear_bit(HIF_WAIT, &gh->gh_iflags); | |
4e857c58 | 349 | smp_mb__after_atomic(); |
6802e340 | 350 | wake_up_bit(&gh->gh_iflags, HIF_WAIT); |
ad26967b BP |
351 | if (gh->gh_flags & GL_ASYNC) { |
352 | struct gfs2_sbd *sdp = gh->gh_gl->gl_name.ln_sbd; | |
353 | ||
354 | wake_up(&sdp->sd_async_glock_wait); | |
355 | } | |
6802e340 SW |
356 | } |
357 | ||
d5341a92 SW |
358 | /** |
359 | * do_error - Something unexpected has happened during a lock request | |
c551f66c LJ |
360 | * @gl: The glock |
361 | * @ret: The status from the DLM | |
d5341a92 SW |
362 | */ |
363 | ||
a527b38e | 364 | static void do_error(struct gfs2_glock *gl, const int ret) |
d5341a92 SW |
365 | { |
366 | struct gfs2_holder *gh, *tmp; | |
367 | ||
368 | list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) { | |
369 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
370 | continue; | |
371 | if (ret & LM_OUT_ERROR) | |
372 | gh->gh_error = -EIO; | |
373 | else if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) | |
374 | gh->gh_error = GLR_TRYFAILED; | |
375 | else | |
376 | continue; | |
377 | list_del_init(&gh->gh_list); | |
378 | trace_gfs2_glock_queue(gh, 0); | |
379 | gfs2_holder_wake(gh); | |
380 | } | |
381 | } | |
382 | ||
6802e340 SW |
383 | /** |
384 | * do_promote - promote as many requests as possible on the current queue | |
385 | * @gl: The glock | |
386 | * | |
813e0c46 SW |
387 | * Returns: 1 if there is a blocked holder at the head of the list, or 2 |
388 | * if a type specific operation is underway. | |
6802e340 SW |
389 | */ |
390 | ||
391 | static int do_promote(struct gfs2_glock *gl) | |
f3dd1649 AG |
392 | __releases(&gl->gl_lockref.lock) |
393 | __acquires(&gl->gl_lockref.lock) | |
6802e340 SW |
394 | { |
395 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
396 | struct gfs2_holder *gh, *tmp; | |
397 | int ret; | |
398 | ||
399 | restart: | |
400 | list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) { | |
401 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
402 | continue; | |
403 | if (may_grant(gl, gh)) { | |
404 | if (gh->gh_list.prev == &gl->gl_holders && | |
405 | glops->go_lock) { | |
f3dd1649 | 406 | spin_unlock(&gl->gl_lockref.lock); |
6802e340 SW |
407 | /* FIXME: eliminate this eventually */ |
408 | ret = glops->go_lock(gh); | |
f3dd1649 | 409 | spin_lock(&gl->gl_lockref.lock); |
6802e340 | 410 | if (ret) { |
813e0c46 SW |
411 | if (ret == 1) |
412 | return 2; | |
6802e340 SW |
413 | gh->gh_error = ret; |
414 | list_del_init(&gh->gh_list); | |
63997775 | 415 | trace_gfs2_glock_queue(gh, 0); |
6802e340 SW |
416 | gfs2_holder_wake(gh); |
417 | goto restart; | |
418 | } | |
419 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
63997775 | 420 | trace_gfs2_promote(gh, 1); |
6802e340 SW |
421 | gfs2_holder_wake(gh); |
422 | goto restart; | |
423 | } | |
424 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
63997775 | 425 | trace_gfs2_promote(gh, 0); |
6802e340 SW |
426 | gfs2_holder_wake(gh); |
427 | continue; | |
428 | } | |
429 | if (gh->gh_list.prev == &gl->gl_holders) | |
430 | return 1; | |
d5341a92 | 431 | do_error(gl, 0); |
6802e340 SW |
432 | break; |
433 | } | |
434 | return 0; | |
435 | } | |
436 | ||
6802e340 SW |
437 | /** |
438 | * find_first_waiter - find the first gh that's waiting for the glock | |
439 | * @gl: the glock | |
440 | */ | |
441 | ||
442 | static inline struct gfs2_holder *find_first_waiter(const struct gfs2_glock *gl) | |
443 | { | |
444 | struct gfs2_holder *gh; | |
445 | ||
446 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
447 | if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
448 | return gh; | |
449 | } | |
450 | return NULL; | |
451 | } | |
452 | ||
453 | /** | |
454 | * state_change - record that the glock is now in a different state | |
455 | * @gl: the glock | |
c551f66c | 456 | * @new_state: the new state |
6802e340 SW |
457 | */ |
458 | ||
459 | static void state_change(struct gfs2_glock *gl, unsigned int new_state) | |
460 | { | |
461 | int held1, held2; | |
462 | ||
463 | held1 = (gl->gl_state != LM_ST_UNLOCKED); | |
464 | held2 = (new_state != LM_ST_UNLOCKED); | |
465 | ||
466 | if (held1 != held2) { | |
e66cf161 | 467 | GLOCK_BUG_ON(gl, __lockref_is_dead(&gl->gl_lockref)); |
6802e340 | 468 | if (held2) |
e66cf161 | 469 | gl->gl_lockref.count++; |
6802e340 | 470 | else |
e66cf161 | 471 | gl->gl_lockref.count--; |
6802e340 | 472 | } |
7cf8dcd3 BP |
473 | if (new_state != gl->gl_target) |
474 | /* shorten our minimum hold time */ | |
475 | gl->gl_hold_time = max(gl->gl_hold_time - GL_GLOCK_HOLD_DECR, | |
476 | GL_GLOCK_MIN_HOLD); | |
6802e340 SW |
477 | gl->gl_state = new_state; |
478 | gl->gl_tchange = jiffies; | |
479 | } | |
480 | ||
35b6f8fb AG |
481 | static void gfs2_set_demote(struct gfs2_glock *gl) |
482 | { | |
483 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; | |
484 | ||
485 | set_bit(GLF_DEMOTE, &gl->gl_flags); | |
486 | smp_mb(); | |
487 | wake_up(&sdp->sd_async_glock_wait); | |
488 | } | |
489 | ||
6802e340 SW |
490 | static void gfs2_demote_wake(struct gfs2_glock *gl) |
491 | { | |
492 | gl->gl_demote_state = LM_ST_EXCLUSIVE; | |
493 | clear_bit(GLF_DEMOTE, &gl->gl_flags); | |
4e857c58 | 494 | smp_mb__after_atomic(); |
6802e340 SW |
495 | wake_up_bit(&gl->gl_flags, GLF_DEMOTE); |
496 | } | |
497 | ||
498 | /** | |
499 | * finish_xmote - The DLM has replied to one of our lock requests | |
500 | * @gl: The glock | |
501 | * @ret: The status from the DLM | |
502 | * | |
503 | */ | |
504 | ||
505 | static void finish_xmote(struct gfs2_glock *gl, unsigned int ret) | |
506 | { | |
507 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
508 | struct gfs2_holder *gh; | |
509 | unsigned state = ret & LM_OUT_ST_MASK; | |
813e0c46 | 510 | int rv; |
6802e340 | 511 | |
f3dd1649 | 512 | spin_lock(&gl->gl_lockref.lock); |
63997775 | 513 | trace_gfs2_glock_state_change(gl, state); |
6802e340 SW |
514 | state_change(gl, state); |
515 | gh = find_first_waiter(gl); | |
516 | ||
517 | /* Demote to UN request arrived during demote to SH or DF */ | |
518 | if (test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags) && | |
519 | state != LM_ST_UNLOCKED && gl->gl_demote_state == LM_ST_UNLOCKED) | |
520 | gl->gl_target = LM_ST_UNLOCKED; | |
521 | ||
522 | /* Check for state != intended state */ | |
523 | if (unlikely(state != gl->gl_target)) { | |
524 | if (gh && !test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)) { | |
525 | /* move to back of queue and try next entry */ | |
526 | if (ret & LM_OUT_CANCELED) { | |
527 | if ((gh->gh_flags & LM_FLAG_PRIORITY) == 0) | |
528 | list_move_tail(&gh->gh_list, &gl->gl_holders); | |
529 | gh = find_first_waiter(gl); | |
530 | gl->gl_target = gh->gh_state; | |
531 | goto retry; | |
532 | } | |
533 | /* Some error or failed "try lock" - report it */ | |
534 | if ((ret & LM_OUT_ERROR) || | |
535 | (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) { | |
536 | gl->gl_target = gl->gl_state; | |
537 | do_error(gl, ret); | |
538 | goto out; | |
539 | } | |
540 | } | |
541 | switch(state) { | |
542 | /* Unlocked due to conversion deadlock, try again */ | |
543 | case LM_ST_UNLOCKED: | |
544 | retry: | |
545 | do_xmote(gl, gh, gl->gl_target); | |
546 | break; | |
547 | /* Conversion fails, unlock and try again */ | |
548 | case LM_ST_SHARED: | |
549 | case LM_ST_DEFERRED: | |
550 | do_xmote(gl, gh, LM_ST_UNLOCKED); | |
551 | break; | |
552 | default: /* Everything else */ | |
e54c78a2 BP |
553 | fs_err(gl->gl_name.ln_sbd, "wanted %u got %u\n", |
554 | gl->gl_target, state); | |
6802e340 SW |
555 | GLOCK_BUG_ON(gl, 1); |
556 | } | |
f3dd1649 | 557 | spin_unlock(&gl->gl_lockref.lock); |
6802e340 SW |
558 | return; |
559 | } | |
560 | ||
561 | /* Fast path - we got what we asked for */ | |
562 | if (test_and_clear_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)) | |
563 | gfs2_demote_wake(gl); | |
564 | if (state != LM_ST_UNLOCKED) { | |
565 | if (glops->go_xmote_bh) { | |
f3dd1649 | 566 | spin_unlock(&gl->gl_lockref.lock); |
f68effb3 | 567 | rv = glops->go_xmote_bh(gl); |
f3dd1649 | 568 | spin_lock(&gl->gl_lockref.lock); |
6802e340 SW |
569 | if (rv) { |
570 | do_error(gl, rv); | |
571 | goto out; | |
572 | } | |
573 | } | |
813e0c46 SW |
574 | rv = do_promote(gl); |
575 | if (rv == 2) | |
576 | goto out_locked; | |
6802e340 SW |
577 | } |
578 | out: | |
579 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
813e0c46 | 580 | out_locked: |
f3dd1649 | 581 | spin_unlock(&gl->gl_lockref.lock); |
6802e340 SW |
582 | } |
583 | ||
865cc3e9 BP |
584 | static bool is_system_glock(struct gfs2_glock *gl) |
585 | { | |
586 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; | |
587 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); | |
588 | ||
589 | if (gl == m_ip->i_gl) | |
590 | return true; | |
591 | return false; | |
592 | } | |
593 | ||
6802e340 SW |
594 | /** |
595 | * do_xmote - Calls the DLM to change the state of a lock | |
596 | * @gl: The lock state | |
597 | * @gh: The holder (only for promotes) | |
598 | * @target: The target lock state | |
599 | * | |
600 | */ | |
601 | ||
602 | static void do_xmote(struct gfs2_glock *gl, struct gfs2_holder *gh, unsigned int target) | |
f3dd1649 AG |
603 | __releases(&gl->gl_lockref.lock) |
604 | __acquires(&gl->gl_lockref.lock) | |
6802e340 SW |
605 | { |
606 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
15562c43 | 607 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
b58bf407 | 608 | unsigned int lck_flags = (unsigned int)(gh ? gh->gh_flags : 0); |
6802e340 SW |
609 | int ret; |
610 | ||
601ef0d5 BP |
611 | if (target != LM_ST_UNLOCKED && glock_blocked_by_withdraw(gl) && |
612 | gh && !(gh->gh_flags & LM_FLAG_NOEXP)) | |
0d1c7ae9 | 613 | return; |
6802e340 SW |
614 | lck_flags &= (LM_FLAG_TRY | LM_FLAG_TRY_1CB | LM_FLAG_NOEXP | |
615 | LM_FLAG_PRIORITY); | |
921169ca SW |
616 | GLOCK_BUG_ON(gl, gl->gl_state == target); |
617 | GLOCK_BUG_ON(gl, gl->gl_state == gl->gl_target); | |
6802e340 SW |
618 | if ((target == LM_ST_UNLOCKED || target == LM_ST_DEFERRED) && |
619 | glops->go_inval) { | |
d99724c3 BP |
620 | /* |
621 | * If another process is already doing the invalidate, let that | |
622 | * finish first. The glock state machine will get back to this | |
623 | * holder again later. | |
624 | */ | |
625 | if (test_and_set_bit(GLF_INVALIDATE_IN_PROGRESS, | |
626 | &gl->gl_flags)) | |
627 | return; | |
6802e340 SW |
628 | do_error(gl, 0); /* Fail queued try locks */ |
629 | } | |
47a25380 | 630 | gl->gl_req = target; |
a245769f SW |
631 | set_bit(GLF_BLOCKING, &gl->gl_flags); |
632 | if ((gl->gl_req == LM_ST_UNLOCKED) || | |
633 | (gl->gl_state == LM_ST_EXCLUSIVE) || | |
634 | (lck_flags & (LM_FLAG_TRY|LM_FLAG_TRY_1CB))) | |
635 | clear_bit(GLF_BLOCKING, &gl->gl_flags); | |
f3dd1649 | 636 | spin_unlock(&gl->gl_lockref.lock); |
1c634f94 BP |
637 | if (glops->go_sync) { |
638 | ret = glops->go_sync(gl); | |
639 | /* If we had a problem syncing (due to io errors or whatever, | |
640 | * we should not invalidate the metadata or tell dlm to | |
641 | * release the glock to other nodes. | |
642 | */ | |
643 | if (ret) { | |
644 | if (cmpxchg(&sdp->sd_log_error, 0, ret)) { | |
645 | fs_err(sdp, "Error %d syncing glock \n", ret); | |
646 | gfs2_dump_glock(NULL, gl, true); | |
647 | } | |
b11e1a84 | 648 | goto skip_inval; |
1c634f94 BP |
649 | } |
650 | } | |
33dbd1e4 BP |
651 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags)) { |
652 | /* | |
653 | * The call to go_sync should have cleared out the ail list. | |
654 | * If there are still items, we have a problem. We ought to | |
655 | * withdraw, but we can't because the withdraw code also uses | |
656 | * glocks. Warn about the error, dump the glock, then fall | |
657 | * through and wait for logd to do the withdraw for us. | |
658 | */ | |
659 | if ((atomic_read(&gl->gl_ail_count) != 0) && | |
660 | (!cmpxchg(&sdp->sd_log_error, 0, -EIO))) { | |
ea4e61c7 BP |
661 | gfs2_glock_assert_warn(gl, |
662 | !atomic_read(&gl->gl_ail_count)); | |
33dbd1e4 BP |
663 | gfs2_dump_glock(NULL, gl, true); |
664 | } | |
6802e340 | 665 | glops->go_inval(gl, target == LM_ST_DEFERRED ? 0 : DIO_METADATA); |
33dbd1e4 BP |
666 | clear_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags); |
667 | } | |
6802e340 | 668 | |
b11e1a84 | 669 | skip_inval: |
6802e340 | 670 | gfs2_glock_hold(gl); |
d93ae386 BP |
671 | /* |
672 | * Check for an error encountered since we called go_sync and go_inval. | |
673 | * If so, we can't withdraw from the glock code because the withdraw | |
674 | * code itself uses glocks (see function signal_our_withdraw) to | |
675 | * change the mount to read-only. Most importantly, we must not call | |
676 | * dlm to unlock the glock until the journal is in a known good state | |
677 | * (after journal replay) otherwise other nodes may use the object | |
678 | * (rgrp or dinode) and then later, journal replay will corrupt the | |
679 | * file system. The best we can do here is wait for the logd daemon | |
680 | * to see sd_log_error and withdraw, and in the meantime, requeue the | |
681 | * work for later. | |
682 | * | |
865cc3e9 BP |
683 | * We make a special exception for some system glocks, such as the |
684 | * system statfs inode glock, which needs to be granted before the | |
685 | * gfs2_quotad daemon can exit, and that exit needs to finish before | |
686 | * we can unmount the withdrawn file system. | |
687 | * | |
d93ae386 BP |
688 | * However, if we're just unlocking the lock (say, for unmount, when |
689 | * gfs2_gl_hash_clear calls clear_glock) and recovery is complete | |
690 | * then it's okay to tell dlm to unlock it. | |
691 | */ | |
692 | if (unlikely(sdp->sd_log_error && !gfs2_withdrawn(sdp))) | |
693 | gfs2_withdraw_delayed(sdp); | |
865cc3e9 BP |
694 | if (glock_blocked_by_withdraw(gl) && |
695 | (target != LM_ST_UNLOCKED || | |
696 | test_bit(SDF_WITHDRAW_RECOVERY, &sdp->sd_flags))) { | |
697 | if (!is_system_glock(gl)) { | |
d93ae386 BP |
698 | gfs2_glock_queue_work(gl, GL_GLOCK_DFT_HOLD); |
699 | goto out; | |
865cc3e9 BP |
700 | } else { |
701 | clear_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags); | |
d93ae386 BP |
702 | } |
703 | } | |
704 | ||
921169ca SW |
705 | if (sdp->sd_lockstruct.ls_ops->lm_lock) { |
706 | /* lock_dlm */ | |
707 | ret = sdp->sd_lockstruct.ls_ops->lm_lock(gl, target, lck_flags); | |
3e11e530 BM |
708 | if (ret == -EINVAL && gl->gl_target == LM_ST_UNLOCKED && |
709 | target == LM_ST_UNLOCKED && | |
710 | test_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags)) { | |
711 | finish_xmote(gl, target); | |
6b0c7440 | 712 | gfs2_glock_queue_work(gl, 0); |
d93ae386 | 713 | } else if (ret) { |
e54c78a2 | 714 | fs_err(sdp, "lm_lock ret %d\n", ret); |
eb43e660 | 715 | GLOCK_BUG_ON(gl, !gfs2_withdrawn(sdp)); |
dba2d70c | 716 | } |
921169ca SW |
717 | } else { /* lock_nolock */ |
718 | finish_xmote(gl, target); | |
6b0c7440 | 719 | gfs2_glock_queue_work(gl, 0); |
6802e340 | 720 | } |
d93ae386 | 721 | out: |
f3dd1649 | 722 | spin_lock(&gl->gl_lockref.lock); |
6802e340 SW |
723 | } |
724 | ||
725 | /** | |
726 | * find_first_holder - find the first "holder" gh | |
727 | * @gl: the glock | |
728 | */ | |
729 | ||
730 | static inline struct gfs2_holder *find_first_holder(const struct gfs2_glock *gl) | |
731 | { | |
732 | struct gfs2_holder *gh; | |
733 | ||
734 | if (!list_empty(&gl->gl_holders)) { | |
969183bc | 735 | gh = list_first_entry(&gl->gl_holders, struct gfs2_holder, gh_list); |
6802e340 SW |
736 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) |
737 | return gh; | |
738 | } | |
739 | return NULL; | |
740 | } | |
741 | ||
742 | /** | |
743 | * run_queue - do all outstanding tasks related to a glock | |
744 | * @gl: The glock in question | |
745 | * @nonblock: True if we must not block in run_queue | |
746 | * | |
747 | */ | |
748 | ||
749 | static void run_queue(struct gfs2_glock *gl, const int nonblock) | |
f3dd1649 AG |
750 | __releases(&gl->gl_lockref.lock) |
751 | __acquires(&gl->gl_lockref.lock) | |
6802e340 SW |
752 | { |
753 | struct gfs2_holder *gh = NULL; | |
813e0c46 | 754 | int ret; |
6802e340 SW |
755 | |
756 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) | |
757 | return; | |
758 | ||
759 | GLOCK_BUG_ON(gl, test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)); | |
760 | ||
761 | if (test_bit(GLF_DEMOTE, &gl->gl_flags) && | |
762 | gl->gl_demote_state != gl->gl_state) { | |
763 | if (find_first_holder(gl)) | |
d8348de0 | 764 | goto out_unlock; |
6802e340 SW |
765 | if (nonblock) |
766 | goto out_sched; | |
767 | set_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags); | |
265d529c | 768 | GLOCK_BUG_ON(gl, gl->gl_demote_state == LM_ST_EXCLUSIVE); |
6802e340 SW |
769 | gl->gl_target = gl->gl_demote_state; |
770 | } else { | |
771 | if (test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
772 | gfs2_demote_wake(gl); | |
813e0c46 SW |
773 | ret = do_promote(gl); |
774 | if (ret == 0) | |
d8348de0 | 775 | goto out_unlock; |
813e0c46 | 776 | if (ret == 2) |
a228df63 | 777 | goto out; |
6802e340 SW |
778 | gh = find_first_waiter(gl); |
779 | gl->gl_target = gh->gh_state; | |
780 | if (!(gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) | |
781 | do_error(gl, 0); /* Fail queued try locks */ | |
782 | } | |
783 | do_xmote(gl, gh, gl->gl_target); | |
a228df63 | 784 | out: |
6802e340 SW |
785 | return; |
786 | ||
787 | out_sched: | |
7e71c55e | 788 | clear_bit(GLF_LOCK, &gl->gl_flags); |
4e857c58 | 789 | smp_mb__after_atomic(); |
e66cf161 | 790 | gl->gl_lockref.count++; |
6b0c7440 | 791 | __gfs2_glock_queue_work(gl, 0); |
7e71c55e SW |
792 | return; |
793 | ||
d8348de0 | 794 | out_unlock: |
6802e340 | 795 | clear_bit(GLF_LOCK, &gl->gl_flags); |
4e857c58 | 796 | smp_mb__after_atomic(); |
7e71c55e | 797 | return; |
6802e340 SW |
798 | } |
799 | ||
f286d627 AG |
800 | void gfs2_inode_remember_delete(struct gfs2_glock *gl, u64 generation) |
801 | { | |
802 | struct gfs2_inode_lvb *ri = (void *)gl->gl_lksb.sb_lvbptr; | |
803 | ||
804 | if (ri->ri_magic == 0) | |
805 | ri->ri_magic = cpu_to_be32(GFS2_MAGIC); | |
806 | if (ri->ri_magic == cpu_to_be32(GFS2_MAGIC)) | |
807 | ri->ri_generation_deleted = cpu_to_be64(generation); | |
808 | } | |
809 | ||
810 | bool gfs2_inode_already_deleted(struct gfs2_glock *gl, u64 generation) | |
811 | { | |
812 | struct gfs2_inode_lvb *ri = (void *)gl->gl_lksb.sb_lvbptr; | |
813 | ||
814 | if (ri->ri_magic != cpu_to_be32(GFS2_MAGIC)) | |
815 | return false; | |
816 | return generation <= be64_to_cpu(ri->ri_generation_deleted); | |
817 | } | |
818 | ||
9e8990de AG |
819 | static void gfs2_glock_poke(struct gfs2_glock *gl) |
820 | { | |
821 | int flags = LM_FLAG_TRY_1CB | LM_FLAG_ANY | GL_SKIP; | |
822 | struct gfs2_holder gh; | |
823 | int error; | |
824 | ||
c07bfb4d AG |
825 | gfs2_holder_init(gl, LM_ST_SHARED, flags, &gh); |
826 | error = gfs2_glock_nq(&gh); | |
9e8990de AG |
827 | if (!error) |
828 | gfs2_glock_dq(&gh); | |
c07bfb4d | 829 | gfs2_holder_uninit(&gh); |
9e8990de AG |
830 | } |
831 | ||
8c7b9262 AG |
832 | static bool gfs2_try_evict(struct gfs2_glock *gl) |
833 | { | |
834 | struct gfs2_inode *ip; | |
835 | bool evicted = false; | |
836 | ||
837 | /* | |
838 | * If there is contention on the iopen glock and we have an inode, try | |
839 | * to grab and release the inode so that it can be evicted. This will | |
840 | * allow the remote node to go ahead and delete the inode without us | |
841 | * having to do it, which will avoid rgrp glock thrashing. | |
842 | * | |
843 | * The remote node is likely still holding the corresponding inode | |
844 | * glock, so it will run before we get to verify that the delete has | |
845 | * happened below. | |
846 | */ | |
847 | spin_lock(&gl->gl_lockref.lock); | |
848 | ip = gl->gl_object; | |
849 | if (ip && !igrab(&ip->i_inode)) | |
850 | ip = NULL; | |
851 | spin_unlock(&gl->gl_lockref.lock); | |
852 | if (ip) { | |
9e8990de AG |
853 | struct gfs2_glock *inode_gl = NULL; |
854 | ||
b0dcffd8 | 855 | gl->gl_no_formal_ino = ip->i_no_formal_ino; |
8c7b9262 AG |
856 | set_bit(GIF_DEFERRED_DELETE, &ip->i_flags); |
857 | d_prune_aliases(&ip->i_inode); | |
858 | iput(&ip->i_inode); | |
859 | ||
860 | /* If the inode was evicted, gl->gl_object will now be NULL. */ | |
861 | spin_lock(&gl->gl_lockref.lock); | |
862 | ip = gl->gl_object; | |
9e8990de AG |
863 | if (ip) { |
864 | inode_gl = ip->i_gl; | |
865 | lockref_get(&inode_gl->gl_lockref); | |
8c7b9262 | 866 | clear_bit(GIF_DEFERRED_DELETE, &ip->i_flags); |
9e8990de | 867 | } |
8c7b9262 | 868 | spin_unlock(&gl->gl_lockref.lock); |
9e8990de AG |
869 | if (inode_gl) { |
870 | gfs2_glock_poke(inode_gl); | |
871 | gfs2_glock_put(inode_gl); | |
872 | } | |
8c7b9262 AG |
873 | evicted = !ip; |
874 | } | |
875 | return evicted; | |
876 | } | |
877 | ||
b94a170e BM |
878 | static void delete_work_func(struct work_struct *work) |
879 | { | |
a0e3cc65 AG |
880 | struct delayed_work *dwork = to_delayed_work(work); |
881 | struct gfs2_glock *gl = container_of(dwork, struct gfs2_glock, gl_delete); | |
15562c43 | 882 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
ec5ec66b | 883 | struct inode *inode; |
044b9414 SW |
884 | u64 no_addr = gl->gl_name.ln_number; |
885 | ||
a0e3cc65 AG |
886 | spin_lock(&gl->gl_lockref.lock); |
887 | clear_bit(GLF_PENDING_DELETE, &gl->gl_flags); | |
888 | spin_unlock(&gl->gl_lockref.lock); | |
889 | ||
8c7b9262 AG |
890 | if (test_bit(GLF_DEMOTE, &gl->gl_flags)) { |
891 | /* | |
892 | * If we can evict the inode, give the remote node trying to | |
893 | * delete the inode some time before verifying that the delete | |
894 | * has happened. Otherwise, if we cause contention on the inode glock | |
895 | * immediately, the remote node will think that we still have | |
896 | * the inode in use, and so it will give up waiting. | |
9e8990de AG |
897 | * |
898 | * If we can't evict the inode, signal to the remote node that | |
899 | * the inode is still in use. We'll later try to delete the | |
900 | * inode locally in gfs2_evict_inode. | |
901 | * | |
902 | * FIXME: We only need to verify that the remote node has | |
903 | * deleted the inode because nodes before this remote delete | |
904 | * rework won't cooperate. At a later time, when we no longer | |
905 | * care about compatibility with such nodes, we can skip this | |
906 | * step entirely. | |
8c7b9262 AG |
907 | */ |
908 | if (gfs2_try_evict(gl)) { | |
909 | if (gfs2_queue_delete_work(gl, 5 * HZ)) | |
910 | return; | |
8c7b9262 | 911 | } |
9e8990de | 912 | goto out; |
8c7b9262 AG |
913 | } |
914 | ||
b0dcffd8 AG |
915 | inode = gfs2_lookup_by_inum(sdp, no_addr, gl->gl_no_formal_ino, |
916 | GFS2_BLKST_UNLINKED); | |
15a798f7 | 917 | if (!IS_ERR_OR_NULL(inode)) { |
044b9414 SW |
918 | d_prune_aliases(inode); |
919 | iput(inode); | |
b94a170e | 920 | } |
a4923865 | 921 | out: |
b94a170e BM |
922 | gfs2_glock_put(gl); |
923 | } | |
924 | ||
c4f68a13 BM |
925 | static void glock_work_func(struct work_struct *work) |
926 | { | |
6802e340 | 927 | unsigned long delay = 0; |
c4f68a13 | 928 | struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_work.work); |
6b0c7440 | 929 | unsigned int drop_refs = 1; |
c4f68a13 | 930 | |
26bb7505 | 931 | if (test_and_clear_bit(GLF_REPLY_PENDING, &gl->gl_flags)) { |
6802e340 | 932 | finish_xmote(gl, gl->gl_reply); |
6b0c7440 | 933 | drop_refs++; |
26bb7505 | 934 | } |
f3dd1649 | 935 | spin_lock(&gl->gl_lockref.lock); |
f90e5b5b | 936 | if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && |
265d529c SW |
937 | gl->gl_state != LM_ST_UNLOCKED && |
938 | gl->gl_demote_state != LM_ST_EXCLUSIVE) { | |
6802e340 | 939 | unsigned long holdtime, now = jiffies; |
f90e5b5b | 940 | |
7cf8dcd3 | 941 | holdtime = gl->gl_tchange + gl->gl_hold_time; |
6802e340 SW |
942 | if (time_before(now, holdtime)) |
943 | delay = holdtime - now; | |
f90e5b5b BP |
944 | |
945 | if (!delay) { | |
946 | clear_bit(GLF_PENDING_DEMOTE, &gl->gl_flags); | |
35b6f8fb | 947 | gfs2_set_demote(gl); |
f90e5b5b | 948 | } |
6802e340 SW |
949 | } |
950 | run_queue(gl, 0); | |
6b0c7440 AG |
951 | if (delay) { |
952 | /* Keep one glock reference for the work we requeue. */ | |
953 | drop_refs--; | |
7cf8dcd3 BP |
954 | if (gl->gl_name.ln_type != LM_TYPE_INODE) |
955 | delay = 0; | |
6b0c7440 | 956 | __gfs2_glock_queue_work(gl, delay); |
7cf8dcd3 | 957 | } |
6b0c7440 AG |
958 | |
959 | /* | |
960 | * Drop the remaining glock references manually here. (Mind that | |
961 | * __gfs2_glock_queue_work depends on the lockref spinlock begin held | |
962 | * here as well.) | |
963 | */ | |
964 | gl->gl_lockref.count -= drop_refs; | |
965 | if (!gl->gl_lockref.count) { | |
966 | __gfs2_glock_put(gl); | |
967 | return; | |
968 | } | |
969 | spin_unlock(&gl->gl_lockref.lock); | |
c4f68a13 BM |
970 | } |
971 | ||
0515480a AG |
972 | static struct gfs2_glock *find_insert_glock(struct lm_lockname *name, |
973 | struct gfs2_glock *new) | |
974 | { | |
975 | struct wait_glock_queue wait; | |
a91323e2 | 976 | wait_queue_head_t *wq = glock_waitqueue(name); |
0515480a AG |
977 | struct gfs2_glock *gl; |
978 | ||
a91323e2 AG |
979 | wait.name = name; |
980 | init_wait(&wait.wait); | |
981 | wait.wait.func = glock_wake_function; | |
982 | ||
0515480a | 983 | again: |
a91323e2 | 984 | prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE); |
0515480a AG |
985 | rcu_read_lock(); |
986 | if (new) { | |
987 | gl = rhashtable_lookup_get_insert_fast(&gl_hash_table, | |
988 | &new->gl_node, ht_parms); | |
989 | if (IS_ERR(gl)) | |
990 | goto out; | |
991 | } else { | |
992 | gl = rhashtable_lookup_fast(&gl_hash_table, | |
993 | name, ht_parms); | |
994 | } | |
995 | if (gl && !lockref_get_not_dead(&gl->gl_lockref)) { | |
996 | rcu_read_unlock(); | |
997 | schedule(); | |
998 | goto again; | |
999 | } | |
1000 | out: | |
1001 | rcu_read_unlock(); | |
a91323e2 | 1002 | finish_wait(wq, &wait.wait); |
0515480a AG |
1003 | return gl; |
1004 | } | |
1005 | ||
b3b94faa DT |
1006 | /** |
1007 | * gfs2_glock_get() - Get a glock, or create one if one doesn't exist | |
1008 | * @sdp: The GFS2 superblock | |
1009 | * @number: the lock number | |
1010 | * @glops: The glock_operations to use | |
1011 | * @create: If 0, don't create the glock if it doesn't exist | |
1012 | * @glp: the glock is returned here | |
1013 | * | |
1014 | * This does not lock a glock, just finds/creates structures for one. | |
1015 | * | |
1016 | * Returns: errno | |
1017 | */ | |
1018 | ||
cd915493 | 1019 | int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 | 1020 | const struct gfs2_glock_operations *glops, int create, |
b3b94faa DT |
1021 | struct gfs2_glock **glp) |
1022 | { | |
009d8518 | 1023 | struct super_block *s = sdp->sd_vfs; |
15562c43 BP |
1024 | struct lm_lockname name = { .ln_number = number, |
1025 | .ln_type = glops->go_type, | |
1026 | .ln_sbd = sdp }; | |
0a52aba7 | 1027 | struct gfs2_glock *gl, *tmp; |
009d8518 | 1028 | struct address_space *mapping; |
bc015cb8 | 1029 | struct kmem_cache *cachep; |
0a52aba7 | 1030 | int ret = 0; |
b3b94faa | 1031 | |
0515480a AG |
1032 | gl = find_insert_glock(&name, NULL); |
1033 | if (gl) { | |
1034 | *glp = gl; | |
b3b94faa | 1035 | return 0; |
0515480a | 1036 | } |
64d576ba SW |
1037 | if (!create) |
1038 | return -ENOENT; | |
b3b94faa | 1039 | |
009d8518 | 1040 | if (glops->go_flags & GLOF_ASPACE) |
bc015cb8 | 1041 | cachep = gfs2_glock_aspace_cachep; |
009d8518 | 1042 | else |
bc015cb8 | 1043 | cachep = gfs2_glock_cachep; |
fe0bbd29 | 1044 | gl = kmem_cache_alloc(cachep, GFP_NOFS); |
b3b94faa DT |
1045 | if (!gl) |
1046 | return -ENOMEM; | |
1047 | ||
dba2d70c | 1048 | memset(&gl->gl_lksb, 0, sizeof(struct dlm_lksb)); |
dba2d70c DT |
1049 | |
1050 | if (glops->go_flags & GLOF_LVB) { | |
f7be987b | 1051 | gl->gl_lksb.sb_lvbptr = kzalloc(GDLM_LVB_SIZE, GFP_NOFS); |
4e2f8849 | 1052 | if (!gl->gl_lksb.sb_lvbptr) { |
dba2d70c DT |
1053 | kmem_cache_free(cachep, gl); |
1054 | return -ENOMEM; | |
1055 | } | |
dba2d70c DT |
1056 | } |
1057 | ||
8f05228e | 1058 | atomic_inc(&sdp->sd_glock_disposal); |
88ffbf3e | 1059 | gl->gl_node.next = NULL; |
ec45d9f5 | 1060 | gl->gl_flags = 0; |
b3b94faa | 1061 | gl->gl_name = name; |
515b269d | 1062 | lockdep_set_subclass(&gl->gl_lockref.lock, glops->go_subclass); |
e66cf161 | 1063 | gl->gl_lockref.count = 1; |
b3b94faa | 1064 | gl->gl_state = LM_ST_UNLOCKED; |
6802e340 | 1065 | gl->gl_target = LM_ST_UNLOCKED; |
c4f68a13 | 1066 | gl->gl_demote_state = LM_ST_EXCLUSIVE; |
b3b94faa | 1067 | gl->gl_ops = glops; |
8b0e1953 | 1068 | gl->gl_dstamp = 0; |
a245769f SW |
1069 | preempt_disable(); |
1070 | /* We use the global stats to estimate the initial per-glock stats */ | |
1071 | gl->gl_stats = this_cpu_ptr(sdp->sd_lkstats)->lkstats[glops->go_type]; | |
1072 | preempt_enable(); | |
1073 | gl->gl_stats.stats[GFS2_LKS_DCOUNT] = 0; | |
1074 | gl->gl_stats.stats[GFS2_LKS_QCOUNT] = 0; | |
c4f68a13 | 1075 | gl->gl_tchange = jiffies; |
ec45d9f5 | 1076 | gl->gl_object = NULL; |
7cf8dcd3 | 1077 | gl->gl_hold_time = GL_GLOCK_DFT_HOLD; |
c4f68a13 | 1078 | INIT_DELAYED_WORK(&gl->gl_work, glock_work_func); |
2ffed529 BP |
1079 | if (gl->gl_name.ln_type == LM_TYPE_IOPEN) |
1080 | INIT_DELAYED_WORK(&gl->gl_delete, delete_work_func); | |
b3b94faa | 1081 | |
009d8518 SW |
1082 | mapping = gfs2_glock2aspace(gl); |
1083 | if (mapping) { | |
1084 | mapping->a_ops = &gfs2_meta_aops; | |
1085 | mapping->host = s->s_bdev->bd_inode; | |
1086 | mapping->flags = 0; | |
1087 | mapping_set_gfp_mask(mapping, GFP_NOFS); | |
252aa6f5 | 1088 | mapping->private_data = NULL; |
009d8518 | 1089 | mapping->writeback_index = 0; |
b3b94faa DT |
1090 | } |
1091 | ||
0515480a | 1092 | tmp = find_insert_glock(&name, gl); |
0a52aba7 | 1093 | if (!tmp) { |
88ffbf3e | 1094 | *glp = gl; |
0a52aba7 | 1095 | goto out; |
b3b94faa | 1096 | } |
0a52aba7 AG |
1097 | if (IS_ERR(tmp)) { |
1098 | ret = PTR_ERR(tmp); | |
1099 | goto out_free; | |
1100 | } | |
0515480a | 1101 | *glp = tmp; |
0a52aba7 AG |
1102 | |
1103 | out_free: | |
88ffbf3e BP |
1104 | kfree(gl->gl_lksb.sb_lvbptr); |
1105 | kmem_cache_free(cachep, gl); | |
da7d554f AA |
1106 | if (atomic_dec_and_test(&sdp->sd_glock_disposal)) |
1107 | wake_up(&sdp->sd_glock_wait); | |
b3b94faa | 1108 | |
0a52aba7 | 1109 | out: |
88ffbf3e | 1110 | return ret; |
b3b94faa DT |
1111 | } |
1112 | ||
1113 | /** | |
1114 | * gfs2_holder_init - initialize a struct gfs2_holder in the default way | |
1115 | * @gl: the glock | |
1116 | * @state: the state we're requesting | |
1117 | * @flags: the modifier flags | |
1118 | * @gh: the holder structure | |
1119 | * | |
1120 | */ | |
1121 | ||
b58bf407 | 1122 | void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, u16 flags, |
b3b94faa DT |
1123 | struct gfs2_holder *gh) |
1124 | { | |
1125 | INIT_LIST_HEAD(&gh->gh_list); | |
1126 | gh->gh_gl = gl; | |
d29c0afe | 1127 | gh->gh_ip = _RET_IP_; |
b1e058da | 1128 | gh->gh_owner_pid = get_pid(task_pid(current)); |
b3b94faa DT |
1129 | gh->gh_state = state; |
1130 | gh->gh_flags = flags; | |
1131 | gh->gh_error = 0; | |
1132 | gh->gh_iflags = 0; | |
b3b94faa DT |
1133 | gfs2_glock_hold(gl); |
1134 | } | |
1135 | ||
1136 | /** | |
1137 | * gfs2_holder_reinit - reinitialize a struct gfs2_holder so we can requeue it | |
1138 | * @state: the state we're requesting | |
1139 | * @flags: the modifier flags | |
1140 | * @gh: the holder structure | |
1141 | * | |
1142 | * Don't mess with the glock. | |
1143 | * | |
1144 | */ | |
1145 | ||
b58bf407 | 1146 | void gfs2_holder_reinit(unsigned int state, u16 flags, struct gfs2_holder *gh) |
b3b94faa DT |
1147 | { |
1148 | gh->gh_state = state; | |
579b78a4 | 1149 | gh->gh_flags = flags; |
3b8249f6 | 1150 | gh->gh_iflags = 0; |
d29c0afe | 1151 | gh->gh_ip = _RET_IP_; |
30badc95 | 1152 | put_pid(gh->gh_owner_pid); |
1a0eae88 | 1153 | gh->gh_owner_pid = get_pid(task_pid(current)); |
b3b94faa DT |
1154 | } |
1155 | ||
1156 | /** | |
1157 | * gfs2_holder_uninit - uninitialize a holder structure (drop glock reference) | |
1158 | * @gh: the holder structure | |
1159 | * | |
1160 | */ | |
1161 | ||
1162 | void gfs2_holder_uninit(struct gfs2_holder *gh) | |
1163 | { | |
b1e058da | 1164 | put_pid(gh->gh_owner_pid); |
b3b94faa | 1165 | gfs2_glock_put(gh->gh_gl); |
6df9f9a2 | 1166 | gfs2_holder_mark_uninitialized(gh); |
d0dc80db | 1167 | gh->gh_ip = 0; |
b3b94faa DT |
1168 | } |
1169 | ||
01123cf1 AG |
1170 | static void gfs2_glock_update_hold_time(struct gfs2_glock *gl, |
1171 | unsigned long start_time) | |
1172 | { | |
1173 | /* Have we waited longer that a second? */ | |
1174 | if (time_after(jiffies, start_time + HZ)) { | |
1175 | /* Lengthen the minimum hold time. */ | |
1176 | gl->gl_hold_time = min(gl->gl_hold_time + GL_GLOCK_HOLD_INCR, | |
1177 | GL_GLOCK_MAX_HOLD); | |
1178 | } | |
1179 | } | |
1180 | ||
07a79049 BP |
1181 | /** |
1182 | * gfs2_glock_wait - wait on a glock acquisition | |
1183 | * @gh: the glock holder | |
1184 | * | |
1185 | * Returns: 0 on success | |
1186 | */ | |
1187 | ||
1188 | int gfs2_glock_wait(struct gfs2_holder *gh) | |
da755fdb | 1189 | { |
01123cf1 | 1190 | unsigned long start_time = jiffies; |
7cf8dcd3 | 1191 | |
6802e340 | 1192 | might_sleep(); |
74316201 | 1193 | wait_on_bit(&gh->gh_iflags, HIF_WAIT, TASK_UNINTERRUPTIBLE); |
01123cf1 | 1194 | gfs2_glock_update_hold_time(gh->gh_gl, start_time); |
07a79049 | 1195 | return gh->gh_error; |
da755fdb SW |
1196 | } |
1197 | ||
ad26967b BP |
1198 | static int glocks_pending(unsigned int num_gh, struct gfs2_holder *ghs) |
1199 | { | |
1200 | int i; | |
1201 | ||
1202 | for (i = 0; i < num_gh; i++) | |
1203 | if (test_bit(HIF_WAIT, &ghs[i].gh_iflags)) | |
1204 | return 1; | |
1205 | return 0; | |
1206 | } | |
1207 | ||
1208 | /** | |
1209 | * gfs2_glock_async_wait - wait on multiple asynchronous glock acquisitions | |
1210 | * @num_gh: the number of holders in the array | |
1211 | * @ghs: the glock holder array | |
1212 | * | |
1213 | * Returns: 0 on success, meaning all glocks have been granted and are held. | |
1214 | * -ESTALE if the request timed out, meaning all glocks were released, | |
1215 | * and the caller should retry the operation. | |
1216 | */ | |
1217 | ||
1218 | int gfs2_glock_async_wait(unsigned int num_gh, struct gfs2_holder *ghs) | |
1219 | { | |
1220 | struct gfs2_sbd *sdp = ghs[0].gh_gl->gl_name.ln_sbd; | |
1221 | int i, ret = 0, timeout = 0; | |
1222 | unsigned long start_time = jiffies; | |
1223 | bool keep_waiting; | |
1224 | ||
1225 | might_sleep(); | |
1226 | /* | |
1227 | * Total up the (minimum hold time * 2) of all glocks and use that to | |
1228 | * determine the max amount of time we should wait. | |
1229 | */ | |
1230 | for (i = 0; i < num_gh; i++) | |
1231 | timeout += ghs[i].gh_gl->gl_hold_time << 1; | |
1232 | ||
1233 | wait_for_dlm: | |
1234 | if (!wait_event_timeout(sdp->sd_async_glock_wait, | |
1235 | !glocks_pending(num_gh, ghs), timeout)) | |
1236 | ret = -ESTALE; /* request timed out. */ | |
1237 | ||
1238 | /* | |
1239 | * If dlm granted all our requests, we need to adjust the glock | |
1240 | * minimum hold time values according to how long we waited. | |
1241 | * | |
1242 | * If our request timed out, we need to repeatedly release any held | |
1243 | * glocks we acquired thus far to allow dlm to acquire the remaining | |
1244 | * glocks without deadlocking. We cannot currently cancel outstanding | |
1245 | * glock acquisitions. | |
1246 | * | |
1247 | * The HIF_WAIT bit tells us which requests still need a response from | |
1248 | * dlm. | |
1249 | * | |
1250 | * If dlm sent us any errors, we return the first error we find. | |
1251 | */ | |
1252 | keep_waiting = false; | |
1253 | for (i = 0; i < num_gh; i++) { | |
1254 | /* Skip holders we have already dequeued below. */ | |
1255 | if (!gfs2_holder_queued(&ghs[i])) | |
1256 | continue; | |
1257 | /* Skip holders with a pending DLM response. */ | |
1258 | if (test_bit(HIF_WAIT, &ghs[i].gh_iflags)) { | |
1259 | keep_waiting = true; | |
1260 | continue; | |
1261 | } | |
1262 | ||
1263 | if (test_bit(HIF_HOLDER, &ghs[i].gh_iflags)) { | |
1264 | if (ret == -ESTALE) | |
1265 | gfs2_glock_dq(&ghs[i]); | |
1266 | else | |
1267 | gfs2_glock_update_hold_time(ghs[i].gh_gl, | |
1268 | start_time); | |
1269 | } | |
1270 | if (!ret) | |
1271 | ret = ghs[i].gh_error; | |
1272 | } | |
1273 | ||
1274 | if (keep_waiting) | |
1275 | goto wait_for_dlm; | |
1276 | ||
1277 | /* | |
1278 | * At this point, we've either acquired all locks or released them all. | |
1279 | */ | |
1280 | return ret; | |
1281 | } | |
1282 | ||
b3b94faa | 1283 | /** |
6802e340 SW |
1284 | * handle_callback - process a demote request |
1285 | * @gl: the glock | |
1286 | * @state: the state the caller wants us to change to | |
c551f66c LJ |
1287 | * @delay: zero to demote immediately; otherwise pending demote |
1288 | * @remote: true if this came from a different cluster node | |
b3b94faa | 1289 | * |
6802e340 SW |
1290 | * There are only two requests that we are going to see in actual |
1291 | * practise: LM_ST_SHARED and LM_ST_UNLOCKED | |
b3b94faa DT |
1292 | */ |
1293 | ||
6802e340 | 1294 | static void handle_callback(struct gfs2_glock *gl, unsigned int state, |
81ffbf65 | 1295 | unsigned long delay, bool remote) |
b3b94faa | 1296 | { |
35b6f8fb AG |
1297 | if (delay) |
1298 | set_bit(GLF_PENDING_DEMOTE, &gl->gl_flags); | |
1299 | else | |
1300 | gfs2_set_demote(gl); | |
6802e340 SW |
1301 | if (gl->gl_demote_state == LM_ST_EXCLUSIVE) { |
1302 | gl->gl_demote_state = state; | |
1303 | gl->gl_demote_time = jiffies; | |
6802e340 SW |
1304 | } else if (gl->gl_demote_state != LM_ST_UNLOCKED && |
1305 | gl->gl_demote_state != state) { | |
1306 | gl->gl_demote_state = LM_ST_UNLOCKED; | |
b3b94faa | 1307 | } |
b94a170e | 1308 | if (gl->gl_ops->go_callback) |
81ffbf65 | 1309 | gl->gl_ops->go_callback(gl, remote); |
7bd8b2eb | 1310 | trace_gfs2_demote_rq(gl, remote); |
b3b94faa DT |
1311 | } |
1312 | ||
6802e340 | 1313 | void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...) |
7c52b166 | 1314 | { |
5e69069c | 1315 | struct va_format vaf; |
7c52b166 RP |
1316 | va_list args; |
1317 | ||
1318 | va_start(args, fmt); | |
5e69069c | 1319 | |
6802e340 | 1320 | if (seq) { |
1bb49303 | 1321 | seq_vprintf(seq, fmt, args); |
6802e340 | 1322 | } else { |
5e69069c JP |
1323 | vaf.fmt = fmt; |
1324 | vaf.va = &args; | |
1325 | ||
d77d1b58 | 1326 | pr_err("%pV", &vaf); |
6802e340 | 1327 | } |
5e69069c | 1328 | |
7c52b166 RP |
1329 | va_end(args); |
1330 | } | |
1331 | ||
b3b94faa DT |
1332 | /** |
1333 | * add_to_queue - Add a holder to the wait queue (but look for recursion) | |
1334 | * @gh: the holder structure to add | |
1335 | * | |
6802e340 SW |
1336 | * Eventually we should move the recursive locking trap to a |
1337 | * debugging option or something like that. This is the fast | |
1338 | * path and needs to have the minimum number of distractions. | |
1339 | * | |
b3b94faa DT |
1340 | */ |
1341 | ||
6802e340 | 1342 | static inline void add_to_queue(struct gfs2_holder *gh) |
f3dd1649 AG |
1343 | __releases(&gl->gl_lockref.lock) |
1344 | __acquires(&gl->gl_lockref.lock) | |
b3b94faa DT |
1345 | { |
1346 | struct gfs2_glock *gl = gh->gh_gl; | |
15562c43 | 1347 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
6802e340 SW |
1348 | struct list_head *insert_pt = NULL; |
1349 | struct gfs2_holder *gh2; | |
e5dc76b9 | 1350 | int try_futile = 0; |
b3b94faa | 1351 | |
ad26967b | 1352 | GLOCK_BUG_ON(gl, gh->gh_owner_pid == NULL); |
fee852e3 | 1353 | if (test_and_set_bit(HIF_WAIT, &gh->gh_iflags)) |
ad26967b | 1354 | GLOCK_BUG_ON(gl, true); |
190562bd | 1355 | |
6802e340 SW |
1356 | if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { |
1357 | if (test_bit(GLF_LOCK, &gl->gl_flags)) | |
e5dc76b9 | 1358 | try_futile = !may_grant(gl, gh); |
6802e340 SW |
1359 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags)) |
1360 | goto fail; | |
1361 | } | |
1362 | ||
1363 | list_for_each_entry(gh2, &gl->gl_holders, gh_list) { | |
1364 | if (unlikely(gh2->gh_owner_pid == gh->gh_owner_pid && | |
1365 | (gh->gh_gl->gl_ops->go_type != LM_TYPE_FLOCK))) | |
1366 | goto trap_recursive; | |
e5dc76b9 BP |
1367 | if (try_futile && |
1368 | !(gh2->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) { | |
6802e340 SW |
1369 | fail: |
1370 | gh->gh_error = GLR_TRYFAILED; | |
1371 | gfs2_holder_wake(gh); | |
1372 | return; | |
b4c20166 | 1373 | } |
6802e340 SW |
1374 | if (test_bit(HIF_HOLDER, &gh2->gh_iflags)) |
1375 | continue; | |
1376 | if (unlikely((gh->gh_flags & LM_FLAG_PRIORITY) && !insert_pt)) | |
1377 | insert_pt = &gh2->gh_list; | |
1378 | } | |
edae38a6 | 1379 | trace_gfs2_glock_queue(gh, 1); |
a245769f SW |
1380 | gfs2_glstats_inc(gl, GFS2_LKS_QCOUNT); |
1381 | gfs2_sbstats_inc(gl, GFS2_LKS_QCOUNT); | |
6802e340 SW |
1382 | if (likely(insert_pt == NULL)) { |
1383 | list_add_tail(&gh->gh_list, &gl->gl_holders); | |
1384 | if (unlikely(gh->gh_flags & LM_FLAG_PRIORITY)) | |
1385 | goto do_cancel; | |
1386 | return; | |
1387 | } | |
1388 | list_add_tail(&gh->gh_list, insert_pt); | |
1389 | do_cancel: | |
969183bc | 1390 | gh = list_first_entry(&gl->gl_holders, struct gfs2_holder, gh_list); |
6802e340 | 1391 | if (!(gh->gh_flags & LM_FLAG_PRIORITY)) { |
f3dd1649 | 1392 | spin_unlock(&gl->gl_lockref.lock); |
048bca22 | 1393 | if (sdp->sd_lockstruct.ls_ops->lm_cancel) |
f057f6cd | 1394 | sdp->sd_lockstruct.ls_ops->lm_cancel(gl); |
f3dd1649 | 1395 | spin_lock(&gl->gl_lockref.lock); |
b3b94faa | 1396 | } |
6802e340 | 1397 | return; |
b3b94faa | 1398 | |
6802e340 | 1399 | trap_recursive: |
e54c78a2 BP |
1400 | fs_err(sdp, "original: %pSR\n", (void *)gh2->gh_ip); |
1401 | fs_err(sdp, "pid: %d\n", pid_nr(gh2->gh_owner_pid)); | |
1402 | fs_err(sdp, "lock type: %d req lock state : %d\n", | |
6802e340 | 1403 | gh2->gh_gl->gl_name.ln_type, gh2->gh_state); |
e54c78a2 BP |
1404 | fs_err(sdp, "new: %pSR\n", (void *)gh->gh_ip); |
1405 | fs_err(sdp, "pid: %d\n", pid_nr(gh->gh_owner_pid)); | |
1406 | fs_err(sdp, "lock type: %d req lock state : %d\n", | |
6802e340 | 1407 | gh->gh_gl->gl_name.ln_type, gh->gh_state); |
3792ce97 | 1408 | gfs2_dump_glock(NULL, gl, true); |
6802e340 | 1409 | BUG(); |
b3b94faa DT |
1410 | } |
1411 | ||
1412 | /** | |
1413 | * gfs2_glock_nq - enqueue a struct gfs2_holder onto a glock (acquire a glock) | |
1414 | * @gh: the holder structure | |
1415 | * | |
1416 | * if (gh->gh_flags & GL_ASYNC), this never returns an error | |
1417 | * | |
1418 | * Returns: 0, GLR_TRYFAILED, or errno on failure | |
1419 | */ | |
1420 | ||
1421 | int gfs2_glock_nq(struct gfs2_holder *gh) | |
1422 | { | |
1423 | struct gfs2_glock *gl = gh->gh_gl; | |
b3b94faa DT |
1424 | int error = 0; |
1425 | ||
601ef0d5 | 1426 | if (glock_blocked_by_withdraw(gl) && !(gh->gh_flags & LM_FLAG_NOEXP)) |
b3b94faa | 1427 | return -EIO; |
b3b94faa | 1428 | |
f42ab085 SW |
1429 | if (test_bit(GLF_LRU, &gl->gl_flags)) |
1430 | gfs2_glock_remove_from_lru(gl); | |
1431 | ||
f3dd1649 | 1432 | spin_lock(&gl->gl_lockref.lock); |
b3b94faa | 1433 | add_to_queue(gh); |
01b172b7 BP |
1434 | if (unlikely((LM_FLAG_NOEXP & gh->gh_flags) && |
1435 | test_and_clear_bit(GLF_FROZEN, &gl->gl_flags))) { | |
0809f6ec | 1436 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
01b172b7 | 1437 | gl->gl_lockref.count++; |
6b0c7440 | 1438 | __gfs2_glock_queue_work(gl, 0); |
01b172b7 | 1439 | } |
6802e340 | 1440 | run_queue(gl, 1); |
f3dd1649 | 1441 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa | 1442 | |
6802e340 SW |
1443 | if (!(gh->gh_flags & GL_ASYNC)) |
1444 | error = gfs2_glock_wait(gh); | |
b3b94faa | 1445 | |
b3b94faa DT |
1446 | return error; |
1447 | } | |
1448 | ||
1449 | /** | |
1450 | * gfs2_glock_poll - poll to see if an async request has been completed | |
1451 | * @gh: the holder | |
1452 | * | |
1453 | * Returns: 1 if the request is ready to be gfs2_glock_wait()ed on | |
1454 | */ | |
1455 | ||
1456 | int gfs2_glock_poll(struct gfs2_holder *gh) | |
1457 | { | |
6802e340 | 1458 | return test_bit(HIF_WAIT, &gh->gh_iflags) ? 0 : 1; |
b3b94faa DT |
1459 | } |
1460 | ||
1461 | /** | |
1462 | * gfs2_glock_dq - dequeue a struct gfs2_holder from a glock (release a glock) | |
1463 | * @gh: the glock holder | |
1464 | * | |
1465 | */ | |
1466 | ||
1467 | void gfs2_glock_dq(struct gfs2_holder *gh) | |
1468 | { | |
1469 | struct gfs2_glock *gl = gh->gh_gl; | |
601ef0d5 | 1470 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
c4f68a13 | 1471 | unsigned delay = 0; |
6802e340 | 1472 | int fast_path = 0; |
b3b94faa | 1473 | |
f3dd1649 | 1474 | spin_lock(&gl->gl_lockref.lock); |
601ef0d5 BP |
1475 | /* |
1476 | * If we're in the process of file system withdraw, we cannot just | |
1477 | * dequeue any glocks until our journal is recovered, lest we | |
1478 | * introduce file system corruption. We need two exceptions to this | |
1479 | * rule: We need to allow unlocking of nondisk glocks and the glock | |
1480 | * for our own journal that needs recovery. | |
1481 | */ | |
1482 | if (test_bit(SDF_WITHDRAW_RECOVERY, &sdp->sd_flags) && | |
1483 | glock_blocked_by_withdraw(gl) && | |
1484 | gh->gh_gl != sdp->sd_jinode_gl) { | |
1485 | sdp->sd_glock_dqs_held++; | |
20265d9a | 1486 | spin_unlock(&gl->gl_lockref.lock); |
601ef0d5 BP |
1487 | might_sleep(); |
1488 | wait_on_bit(&sdp->sd_flags, SDF_WITHDRAW_RECOVERY, | |
1489 | TASK_UNINTERRUPTIBLE); | |
20265d9a | 1490 | spin_lock(&gl->gl_lockref.lock); |
601ef0d5 | 1491 | } |
b3b94faa | 1492 | if (gh->gh_flags & GL_NOCACHE) |
81ffbf65 | 1493 | handle_callback(gl, LM_ST_UNLOCKED, 0, false); |
b3b94faa | 1494 | |
b3b94faa | 1495 | list_del_init(&gh->gh_list); |
7508abc4 | 1496 | clear_bit(HIF_HOLDER, &gh->gh_iflags); |
08d73666 BP |
1497 | if (list_empty(&gl->gl_holders) && |
1498 | !test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && | |
1499 | !test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
1500 | fast_path = 1; | |
1501 | ||
7881ef3f | 1502 | if (!test_bit(GLF_LFLUSH, &gl->gl_flags) && demote_ok(gl)) |
4abb6ad9 BP |
1503 | gfs2_glock_add_to_lru(gl); |
1504 | ||
63997775 | 1505 | trace_gfs2_glock_queue(gh, 0); |
6b0c7440 AG |
1506 | if (unlikely(!fast_path)) { |
1507 | gl->gl_lockref.count++; | |
1508 | if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && | |
1509 | !test_bit(GLF_DEMOTE, &gl->gl_flags) && | |
1510 | gl->gl_name.ln_type == LM_TYPE_INODE) | |
1511 | delay = gl->gl_hold_time; | |
1512 | __gfs2_glock_queue_work(gl, delay); | |
1513 | } | |
f3dd1649 | 1514 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa DT |
1515 | } |
1516 | ||
d93cfa98 AD |
1517 | void gfs2_glock_dq_wait(struct gfs2_holder *gh) |
1518 | { | |
1519 | struct gfs2_glock *gl = gh->gh_gl; | |
1520 | gfs2_glock_dq(gh); | |
81e1d450 | 1521 | might_sleep(); |
74316201 | 1522 | wait_on_bit(&gl->gl_flags, GLF_DEMOTE, TASK_UNINTERRUPTIBLE); |
d93cfa98 AD |
1523 | } |
1524 | ||
b3b94faa DT |
1525 | /** |
1526 | * gfs2_glock_dq_uninit - dequeue a holder from a glock and initialize it | |
1527 | * @gh: the holder structure | |
1528 | * | |
1529 | */ | |
1530 | ||
1531 | void gfs2_glock_dq_uninit(struct gfs2_holder *gh) | |
1532 | { | |
1533 | gfs2_glock_dq(gh); | |
1534 | gfs2_holder_uninit(gh); | |
1535 | } | |
1536 | ||
1537 | /** | |
1538 | * gfs2_glock_nq_num - acquire a glock based on lock number | |
1539 | * @sdp: the filesystem | |
1540 | * @number: the lock number | |
1541 | * @glops: the glock operations for the type of glock | |
1542 | * @state: the state to acquire the glock in | |
25985edc | 1543 | * @flags: modifier flags for the acquisition |
b3b94faa DT |
1544 | * @gh: the struct gfs2_holder |
1545 | * | |
1546 | * Returns: errno | |
1547 | */ | |
1548 | ||
cd915493 | 1549 | int gfs2_glock_nq_num(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 | 1550 | const struct gfs2_glock_operations *glops, |
b58bf407 | 1551 | unsigned int state, u16 flags, struct gfs2_holder *gh) |
b3b94faa DT |
1552 | { |
1553 | struct gfs2_glock *gl; | |
1554 | int error; | |
1555 | ||
1556 | error = gfs2_glock_get(sdp, number, glops, CREATE, &gl); | |
1557 | if (!error) { | |
1558 | error = gfs2_glock_nq_init(gl, state, flags, gh); | |
1559 | gfs2_glock_put(gl); | |
1560 | } | |
1561 | ||
1562 | return error; | |
1563 | } | |
1564 | ||
1565 | /** | |
1566 | * glock_compare - Compare two struct gfs2_glock structures for sorting | |
1567 | * @arg_a: the first structure | |
1568 | * @arg_b: the second structure | |
1569 | * | |
1570 | */ | |
1571 | ||
1572 | static int glock_compare(const void *arg_a, const void *arg_b) | |
1573 | { | |
a5e08a9e SW |
1574 | const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a; |
1575 | const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b; | |
1576 | const struct lm_lockname *a = &gh_a->gh_gl->gl_name; | |
1577 | const struct lm_lockname *b = &gh_b->gh_gl->gl_name; | |
b3b94faa DT |
1578 | |
1579 | if (a->ln_number > b->ln_number) | |
a5e08a9e SW |
1580 | return 1; |
1581 | if (a->ln_number < b->ln_number) | |
1582 | return -1; | |
1c0f4872 | 1583 | BUG_ON(gh_a->gh_gl->gl_ops->go_type == gh_b->gh_gl->gl_ops->go_type); |
a5e08a9e | 1584 | return 0; |
b3b94faa DT |
1585 | } |
1586 | ||
1587 | /** | |
1588 | * nq_m_sync - synchonously acquire more than one glock in deadlock free order | |
1589 | * @num_gh: the number of structures | |
1590 | * @ghs: an array of struct gfs2_holder structures | |
c551f66c | 1591 | * @p: placeholder for the holder structure to pass back |
b3b94faa DT |
1592 | * |
1593 | * Returns: 0 on success (all glocks acquired), | |
1594 | * errno on failure (no glocks acquired) | |
1595 | */ | |
1596 | ||
1597 | static int nq_m_sync(unsigned int num_gh, struct gfs2_holder *ghs, | |
1598 | struct gfs2_holder **p) | |
1599 | { | |
1600 | unsigned int x; | |
1601 | int error = 0; | |
1602 | ||
1603 | for (x = 0; x < num_gh; x++) | |
1604 | p[x] = &ghs[x]; | |
1605 | ||
1606 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare, NULL); | |
1607 | ||
1608 | for (x = 0; x < num_gh; x++) { | |
1609 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1610 | ||
1611 | error = gfs2_glock_nq(p[x]); | |
1612 | if (error) { | |
1613 | while (x--) | |
1614 | gfs2_glock_dq(p[x]); | |
1615 | break; | |
1616 | } | |
1617 | } | |
1618 | ||
1619 | return error; | |
1620 | } | |
1621 | ||
1622 | /** | |
1623 | * gfs2_glock_nq_m - acquire multiple glocks | |
1624 | * @num_gh: the number of structures | |
1625 | * @ghs: an array of struct gfs2_holder structures | |
1626 | * | |
b3b94faa DT |
1627 | * |
1628 | * Returns: 0 on success (all glocks acquired), | |
1629 | * errno on failure (no glocks acquired) | |
1630 | */ | |
1631 | ||
1632 | int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1633 | { | |
eaf5bd3c SW |
1634 | struct gfs2_holder *tmp[4]; |
1635 | struct gfs2_holder **pph = tmp; | |
b3b94faa DT |
1636 | int error = 0; |
1637 | ||
eaf5bd3c SW |
1638 | switch(num_gh) { |
1639 | case 0: | |
b3b94faa | 1640 | return 0; |
eaf5bd3c | 1641 | case 1: |
b3b94faa DT |
1642 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); |
1643 | return gfs2_glock_nq(ghs); | |
eaf5bd3c SW |
1644 | default: |
1645 | if (num_gh <= 4) | |
b3b94faa | 1646 | break; |
6da2ec56 KC |
1647 | pph = kmalloc_array(num_gh, sizeof(struct gfs2_holder *), |
1648 | GFP_NOFS); | |
eaf5bd3c SW |
1649 | if (!pph) |
1650 | return -ENOMEM; | |
b3b94faa DT |
1651 | } |
1652 | ||
eaf5bd3c | 1653 | error = nq_m_sync(num_gh, ghs, pph); |
b3b94faa | 1654 | |
eaf5bd3c SW |
1655 | if (pph != tmp) |
1656 | kfree(pph); | |
b3b94faa DT |
1657 | |
1658 | return error; | |
1659 | } | |
1660 | ||
1661 | /** | |
1662 | * gfs2_glock_dq_m - release multiple glocks | |
1663 | * @num_gh: the number of structures | |
1664 | * @ghs: an array of struct gfs2_holder structures | |
1665 | * | |
1666 | */ | |
1667 | ||
1668 | void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1669 | { | |
fa1bbdea BP |
1670 | while (num_gh--) |
1671 | gfs2_glock_dq(&ghs[num_gh]); | |
b3b94faa DT |
1672 | } |
1673 | ||
f057f6cd | 1674 | void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state) |
da755fdb | 1675 | { |
c4f68a13 BM |
1676 | unsigned long delay = 0; |
1677 | unsigned long holdtime; | |
1678 | unsigned long now = jiffies; | |
b3b94faa | 1679 | |
f057f6cd | 1680 | gfs2_glock_hold(gl); |
e2c6c8a7 | 1681 | spin_lock(&gl->gl_lockref.lock); |
7cf8dcd3 | 1682 | holdtime = gl->gl_tchange + gl->gl_hold_time; |
e2c6c8a7 | 1683 | if (!list_empty(&gl->gl_holders) && |
7cf8dcd3 | 1684 | gl->gl_name.ln_type == LM_TYPE_INODE) { |
7b5e3d5f SW |
1685 | if (time_before(now, holdtime)) |
1686 | delay = holdtime - now; | |
1687 | if (test_bit(GLF_REPLY_PENDING, &gl->gl_flags)) | |
7cf8dcd3 | 1688 | delay = gl->gl_hold_time; |
7b5e3d5f | 1689 | } |
81ffbf65 | 1690 | handle_callback(gl, state, delay, true); |
6b0c7440 | 1691 | __gfs2_glock_queue_work(gl, delay); |
f3dd1649 | 1692 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa DT |
1693 | } |
1694 | ||
0809f6ec SW |
1695 | /** |
1696 | * gfs2_should_freeze - Figure out if glock should be frozen | |
1697 | * @gl: The glock in question | |
1698 | * | |
1699 | * Glocks are not frozen if (a) the result of the dlm operation is | |
1700 | * an error, (b) the locking operation was an unlock operation or | |
1701 | * (c) if there is a "noexp" flagged request anywhere in the queue | |
1702 | * | |
1703 | * Returns: 1 if freezing should occur, 0 otherwise | |
1704 | */ | |
1705 | ||
1706 | static int gfs2_should_freeze(const struct gfs2_glock *gl) | |
1707 | { | |
1708 | const struct gfs2_holder *gh; | |
1709 | ||
1710 | if (gl->gl_reply & ~LM_OUT_ST_MASK) | |
1711 | return 0; | |
1712 | if (gl->gl_target == LM_ST_UNLOCKED) | |
1713 | return 0; | |
1714 | ||
1715 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
1716 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
1717 | continue; | |
1718 | if (LM_FLAG_NOEXP & gh->gh_flags) | |
1719 | return 0; | |
1720 | } | |
1721 | ||
1722 | return 1; | |
1723 | } | |
1724 | ||
b3b94faa | 1725 | /** |
f057f6cd SW |
1726 | * gfs2_glock_complete - Callback used by locking |
1727 | * @gl: Pointer to the glock | |
1728 | * @ret: The return value from the dlm | |
b3b94faa | 1729 | * |
f3dd1649 | 1730 | * The gl_reply field is under the gl_lockref.lock lock so that it is ok |
47a25380 | 1731 | * to use a bitfield shared with other glock state fields. |
b3b94faa DT |
1732 | */ |
1733 | ||
f057f6cd | 1734 | void gfs2_glock_complete(struct gfs2_glock *gl, int ret) |
b3b94faa | 1735 | { |
15562c43 | 1736 | struct lm_lockstruct *ls = &gl->gl_name.ln_sbd->sd_lockstruct; |
0809f6ec | 1737 | |
f3dd1649 | 1738 | spin_lock(&gl->gl_lockref.lock); |
f057f6cd | 1739 | gl->gl_reply = ret; |
0809f6ec | 1740 | |
e0c2a9aa | 1741 | if (unlikely(test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))) { |
0809f6ec | 1742 | if (gfs2_should_freeze(gl)) { |
f057f6cd | 1743 | set_bit(GLF_FROZEN, &gl->gl_flags); |
f3dd1649 | 1744 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa | 1745 | return; |
0809f6ec | 1746 | } |
b3b94faa | 1747 | } |
47a25380 | 1748 | |
e66cf161 | 1749 | gl->gl_lockref.count++; |
f057f6cd | 1750 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
6b0c7440 | 1751 | __gfs2_glock_queue_work(gl, 0); |
f3dd1649 | 1752 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa DT |
1753 | } |
1754 | ||
4f0f586b ST |
1755 | static int glock_cmp(void *priv, const struct list_head *a, |
1756 | const struct list_head *b) | |
4506a519 SW |
1757 | { |
1758 | struct gfs2_glock *gla, *glb; | |
1759 | ||
1760 | gla = list_entry(a, struct gfs2_glock, gl_lru); | |
1761 | glb = list_entry(b, struct gfs2_glock, gl_lru); | |
1762 | ||
1763 | if (gla->gl_name.ln_number > glb->gl_name.ln_number) | |
1764 | return 1; | |
1765 | if (gla->gl_name.ln_number < glb->gl_name.ln_number) | |
1766 | return -1; | |
1767 | ||
1768 | return 0; | |
1769 | } | |
1770 | ||
1771 | /** | |
1772 | * gfs2_dispose_glock_lru - Demote a list of glocks | |
1773 | * @list: The list to dispose of | |
1774 | * | |
1775 | * Disposing of glocks may involve disk accesses, so that here we sort | |
1776 | * the glocks by number (i.e. disk location of the inodes) so that if | |
1777 | * there are any such accesses, they'll be sent in order (mostly). | |
1778 | * | |
1779 | * Must be called under the lru_lock, but may drop and retake this | |
1780 | * lock. While the lru_lock is dropped, entries may vanish from the | |
1781 | * list, but no new entries will appear on the list (since it is | |
1782 | * private) | |
1783 | */ | |
1784 | ||
1785 | static void gfs2_dispose_glock_lru(struct list_head *list) | |
1786 | __releases(&lru_lock) | |
1787 | __acquires(&lru_lock) | |
1788 | { | |
1789 | struct gfs2_glock *gl; | |
1790 | ||
1791 | list_sort(NULL, list, glock_cmp); | |
1792 | ||
1793 | while(!list_empty(list)) { | |
969183bc | 1794 | gl = list_first_entry(list, struct gfs2_glock, gl_lru); |
4506a519 | 1795 | list_del_init(&gl->gl_lru); |
1ab19c5d | 1796 | clear_bit(GLF_LRU, &gl->gl_flags); |
f3dd1649 | 1797 | if (!spin_trylock(&gl->gl_lockref.lock)) { |
94a09a39 | 1798 | add_back_to_lru: |
e66cf161 | 1799 | list_add(&gl->gl_lru, &lru_list); |
7881ef3f | 1800 | set_bit(GLF_LRU, &gl->gl_flags); |
e66cf161 SW |
1801 | atomic_inc(&lru_count); |
1802 | continue; | |
1803 | } | |
94a09a39 | 1804 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) { |
f3dd1649 | 1805 | spin_unlock(&gl->gl_lockref.lock); |
94a09a39 SW |
1806 | goto add_back_to_lru; |
1807 | } | |
e66cf161 | 1808 | gl->gl_lockref.count++; |
4506a519 | 1809 | if (demote_ok(gl)) |
81ffbf65 | 1810 | handle_callback(gl, LM_ST_UNLOCKED, 0, false); |
4506a519 | 1811 | WARN_ON(!test_and_clear_bit(GLF_LOCK, &gl->gl_flags)); |
6b0c7440 | 1812 | __gfs2_glock_queue_work(gl, 0); |
f3dd1649 | 1813 | spin_unlock(&gl->gl_lockref.lock); |
94a09a39 | 1814 | cond_resched_lock(&lru_lock); |
4506a519 SW |
1815 | } |
1816 | } | |
1817 | ||
2a005855 SW |
1818 | /** |
1819 | * gfs2_scan_glock_lru - Scan the LRU looking for locks to demote | |
1820 | * @nr: The number of entries to scan | |
1821 | * | |
4506a519 SW |
1822 | * This function selects the entries on the LRU which are able to |
1823 | * be demoted, and then kicks off the process by calling | |
1824 | * gfs2_dispose_glock_lru() above. | |
2a005855 | 1825 | */ |
b3b94faa | 1826 | |
1ab6c499 | 1827 | static long gfs2_scan_glock_lru(int nr) |
b3b94faa DT |
1828 | { |
1829 | struct gfs2_glock *gl; | |
97cc1025 | 1830 | LIST_HEAD(skipped); |
4506a519 | 1831 | LIST_HEAD(dispose); |
1ab6c499 | 1832 | long freed = 0; |
b3b94faa | 1833 | |
97cc1025 | 1834 | spin_lock(&lru_lock); |
1ab6c499 | 1835 | while ((nr-- >= 0) && !list_empty(&lru_list)) { |
969183bc | 1836 | gl = list_first_entry(&lru_list, struct gfs2_glock, gl_lru); |
97cc1025 SW |
1837 | |
1838 | /* Test for being demotable */ | |
94a09a39 | 1839 | if (!test_bit(GLF_LOCK, &gl->gl_flags)) { |
4506a519 SW |
1840 | list_move(&gl->gl_lru, &dispose); |
1841 | atomic_dec(&lru_count); | |
1ab6c499 | 1842 | freed++; |
2163b1e6 | 1843 | continue; |
97cc1025 | 1844 | } |
4506a519 SW |
1845 | |
1846 | list_move(&gl->gl_lru, &skipped); | |
b3b94faa | 1847 | } |
97cc1025 | 1848 | list_splice(&skipped, &lru_list); |
4506a519 SW |
1849 | if (!list_empty(&dispose)) |
1850 | gfs2_dispose_glock_lru(&dispose); | |
97cc1025 | 1851 | spin_unlock(&lru_lock); |
1ab6c499 DC |
1852 | |
1853 | return freed; | |
2a005855 SW |
1854 | } |
1855 | ||
1ab6c499 DC |
1856 | static unsigned long gfs2_glock_shrink_scan(struct shrinker *shrink, |
1857 | struct shrink_control *sc) | |
2a005855 | 1858 | { |
1ab6c499 DC |
1859 | if (!(sc->gfp_mask & __GFP_FS)) |
1860 | return SHRINK_STOP; | |
1861 | return gfs2_scan_glock_lru(sc->nr_to_scan); | |
1862 | } | |
2a005855 | 1863 | |
1ab6c499 DC |
1864 | static unsigned long gfs2_glock_shrink_count(struct shrinker *shrink, |
1865 | struct shrink_control *sc) | |
1866 | { | |
55f841ce | 1867 | return vfs_pressure_ratio(atomic_read(&lru_count)); |
b3b94faa DT |
1868 | } |
1869 | ||
97cc1025 | 1870 | static struct shrinker glock_shrinker = { |
97cc1025 | 1871 | .seeks = DEFAULT_SEEKS, |
1ab6c499 DC |
1872 | .count_objects = gfs2_glock_shrink_count, |
1873 | .scan_objects = gfs2_glock_shrink_scan, | |
97cc1025 SW |
1874 | }; |
1875 | ||
b3b94faa | 1876 | /** |
dbffb29d | 1877 | * glock_hash_walk - Call a function for glock in a hash bucket |
b3b94faa DT |
1878 | * @examiner: the function |
1879 | * @sdp: the filesystem | |
b3b94faa | 1880 | * |
98687f42 HX |
1881 | * Note that the function can be called multiple times on the same |
1882 | * object. So the user must ensure that the function can cope with | |
1883 | * that. | |
b3b94faa DT |
1884 | */ |
1885 | ||
88ffbf3e | 1886 | static void glock_hash_walk(glock_examiner examiner, const struct gfs2_sbd *sdp) |
b3b94faa | 1887 | { |
bc015cb8 | 1888 | struct gfs2_glock *gl; |
98687f42 HX |
1889 | struct rhashtable_iter iter; |
1890 | ||
1891 | rhashtable_walk_enter(&gl_hash_table, &iter); | |
1892 | ||
1893 | do { | |
97a6ec4a | 1894 | rhashtable_walk_start(&iter); |
98687f42 HX |
1895 | |
1896 | while ((gl = rhashtable_walk_next(&iter)) && !IS_ERR(gl)) | |
27c3b415 | 1897 | if (gl->gl_name.ln_sbd == sdp && |
88ffbf3e BP |
1898 | lockref_get_not_dead(&gl->gl_lockref)) |
1899 | examiner(gl); | |
98687f42 HX |
1900 | |
1901 | rhashtable_walk_stop(&iter); | |
1902 | } while (cond_resched(), gl == ERR_PTR(-EAGAIN)); | |
1903 | ||
1904 | rhashtable_walk_exit(&iter); | |
bc015cb8 SW |
1905 | } |
1906 | ||
a0e3cc65 AG |
1907 | bool gfs2_queue_delete_work(struct gfs2_glock *gl, unsigned long delay) |
1908 | { | |
1909 | bool queued; | |
1910 | ||
1911 | spin_lock(&gl->gl_lockref.lock); | |
1912 | queued = queue_delayed_work(gfs2_delete_workqueue, | |
1913 | &gl->gl_delete, delay); | |
1914 | if (queued) | |
1915 | set_bit(GLF_PENDING_DELETE, &gl->gl_flags); | |
1916 | spin_unlock(&gl->gl_lockref.lock); | |
1917 | return queued; | |
1918 | } | |
1919 | ||
1920 | void gfs2_cancel_delete_work(struct gfs2_glock *gl) | |
1921 | { | |
1922 | if (cancel_delayed_work_sync(&gl->gl_delete)) { | |
1923 | clear_bit(GLF_PENDING_DELETE, &gl->gl_flags); | |
1924 | gfs2_glock_put(gl); | |
1925 | } | |
1926 | } | |
1927 | ||
1928 | bool gfs2_delete_work_queued(const struct gfs2_glock *gl) | |
1929 | { | |
1930 | return test_bit(GLF_PENDING_DELETE, &gl->gl_flags); | |
1931 | } | |
1932 | ||
1933 | static void flush_delete_work(struct gfs2_glock *gl) | |
1934 | { | |
2ffed529 BP |
1935 | if (gl->gl_name.ln_type == LM_TYPE_IOPEN) { |
1936 | if (cancel_delayed_work(&gl->gl_delete)) { | |
1937 | queue_delayed_work(gfs2_delete_workqueue, | |
1938 | &gl->gl_delete, 0); | |
1939 | } | |
34244d71 | 1940 | } |
a0e3cc65 AG |
1941 | gfs2_glock_queue_work(gl, 0); |
1942 | } | |
1943 | ||
1944 | void gfs2_flush_delete_work(struct gfs2_sbd *sdp) | |
1945 | { | |
1946 | glock_hash_walk(flush_delete_work, sdp); | |
1947 | flush_workqueue(gfs2_delete_workqueue); | |
1948 | } | |
1949 | ||
f057f6cd SW |
1950 | /** |
1951 | * thaw_glock - thaw out a glock which has an unprocessed reply waiting | |
1952 | * @gl: The glock to thaw | |
1953 | * | |
f057f6cd SW |
1954 | */ |
1955 | ||
1956 | static void thaw_glock(struct gfs2_glock *gl) | |
1957 | { | |
6b0c7440 | 1958 | if (!test_and_clear_bit(GLF_FROZEN, &gl->gl_flags)) { |
f057f6cd | 1959 | gfs2_glock_put(gl); |
6b0c7440 | 1960 | return; |
7286b31e | 1961 | } |
6b0c7440 AG |
1962 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
1963 | gfs2_glock_queue_work(gl, 0); | |
f057f6cd SW |
1964 | } |
1965 | ||
b3b94faa DT |
1966 | /** |
1967 | * clear_glock - look at a glock and see if we can free it from glock cache | |
1968 | * @gl: the glock to look at | |
1969 | * | |
1970 | */ | |
1971 | ||
1972 | static void clear_glock(struct gfs2_glock *gl) | |
1973 | { | |
f42ab085 | 1974 | gfs2_glock_remove_from_lru(gl); |
b3b94faa | 1975 | |
f3dd1649 | 1976 | spin_lock(&gl->gl_lockref.lock); |
c741c455 | 1977 | if (gl->gl_state != LM_ST_UNLOCKED) |
81ffbf65 | 1978 | handle_callback(gl, LM_ST_UNLOCKED, 0, false); |
6b0c7440 | 1979 | __gfs2_glock_queue_work(gl, 0); |
f3dd1649 | 1980 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa DT |
1981 | } |
1982 | ||
f057f6cd SW |
1983 | /** |
1984 | * gfs2_glock_thaw - Thaw any frozen glocks | |
1985 | * @sdp: The super block | |
1986 | * | |
1987 | */ | |
1988 | ||
1989 | void gfs2_glock_thaw(struct gfs2_sbd *sdp) | |
1990 | { | |
bc015cb8 SW |
1991 | glock_hash_walk(thaw_glock, sdp); |
1992 | } | |
f057f6cd | 1993 | |
3792ce97 | 1994 | static void dump_glock(struct seq_file *seq, struct gfs2_glock *gl, bool fsid) |
bc015cb8 | 1995 | { |
f3dd1649 | 1996 | spin_lock(&gl->gl_lockref.lock); |
3792ce97 | 1997 | gfs2_dump_glock(seq, gl, fsid); |
f3dd1649 | 1998 | spin_unlock(&gl->gl_lockref.lock); |
bc015cb8 SW |
1999 | } |
2000 | ||
2001 | static void dump_glock_func(struct gfs2_glock *gl) | |
2002 | { | |
3792ce97 | 2003 | dump_glock(NULL, gl, true); |
f057f6cd SW |
2004 | } |
2005 | ||
b3b94faa DT |
2006 | /** |
2007 | * gfs2_gl_hash_clear - Empty out the glock hash table | |
2008 | * @sdp: the filesystem | |
b3b94faa | 2009 | * |
1bdad606 | 2010 | * Called when unmounting the filesystem. |
b3b94faa DT |
2011 | */ |
2012 | ||
fefc03bf | 2013 | void gfs2_gl_hash_clear(struct gfs2_sbd *sdp) |
b3b94faa | 2014 | { |
fb6791d1 | 2015 | set_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags); |
222cb538 | 2016 | flush_workqueue(glock_workqueue); |
bc015cb8 | 2017 | glock_hash_walk(clear_glock, sdp); |
8f05228e | 2018 | flush_workqueue(glock_workqueue); |
2aba1b5b BP |
2019 | wait_event_timeout(sdp->sd_glock_wait, |
2020 | atomic_read(&sdp->sd_glock_disposal) == 0, | |
2021 | HZ * 600); | |
bc015cb8 | 2022 | glock_hash_walk(dump_glock_func, sdp); |
b3b94faa DT |
2023 | } |
2024 | ||
813e0c46 SW |
2025 | void gfs2_glock_finish_truncate(struct gfs2_inode *ip) |
2026 | { | |
2027 | struct gfs2_glock *gl = ip->i_gl; | |
2028 | int ret; | |
2029 | ||
2030 | ret = gfs2_truncatei_resume(ip); | |
ea4e61c7 | 2031 | gfs2_glock_assert_withdraw(gl, ret == 0); |
813e0c46 | 2032 | |
f3dd1649 | 2033 | spin_lock(&gl->gl_lockref.lock); |
813e0c46 SW |
2034 | clear_bit(GLF_LOCK, &gl->gl_flags); |
2035 | run_queue(gl, 1); | |
f3dd1649 | 2036 | spin_unlock(&gl->gl_lockref.lock); |
813e0c46 SW |
2037 | } |
2038 | ||
6802e340 | 2039 | static const char *state2str(unsigned state) |
04b933f2 | 2040 | { |
6802e340 SW |
2041 | switch(state) { |
2042 | case LM_ST_UNLOCKED: | |
2043 | return "UN"; | |
2044 | case LM_ST_SHARED: | |
2045 | return "SH"; | |
2046 | case LM_ST_DEFERRED: | |
2047 | return "DF"; | |
2048 | case LM_ST_EXCLUSIVE: | |
2049 | return "EX"; | |
2050 | } | |
2051 | return "??"; | |
2052 | } | |
2053 | ||
b58bf407 | 2054 | static const char *hflags2str(char *buf, u16 flags, unsigned long iflags) |
6802e340 SW |
2055 | { |
2056 | char *p = buf; | |
2057 | if (flags & LM_FLAG_TRY) | |
2058 | *p++ = 't'; | |
2059 | if (flags & LM_FLAG_TRY_1CB) | |
2060 | *p++ = 'T'; | |
2061 | if (flags & LM_FLAG_NOEXP) | |
2062 | *p++ = 'e'; | |
2063 | if (flags & LM_FLAG_ANY) | |
f057f6cd | 2064 | *p++ = 'A'; |
6802e340 SW |
2065 | if (flags & LM_FLAG_PRIORITY) |
2066 | *p++ = 'p'; | |
06e908cd BP |
2067 | if (flags & LM_FLAG_NODE_SCOPE) |
2068 | *p++ = 'n'; | |
6802e340 SW |
2069 | if (flags & GL_ASYNC) |
2070 | *p++ = 'a'; | |
2071 | if (flags & GL_EXACT) | |
2072 | *p++ = 'E'; | |
6802e340 SW |
2073 | if (flags & GL_NOCACHE) |
2074 | *p++ = 'c'; | |
2075 | if (test_bit(HIF_HOLDER, &iflags)) | |
2076 | *p++ = 'H'; | |
2077 | if (test_bit(HIF_WAIT, &iflags)) | |
2078 | *p++ = 'W'; | |
6802e340 SW |
2079 | *p = 0; |
2080 | return buf; | |
04b933f2 RP |
2081 | } |
2082 | ||
b3b94faa DT |
2083 | /** |
2084 | * dump_holder - print information about a glock holder | |
6802e340 | 2085 | * @seq: the seq_file struct |
b3b94faa | 2086 | * @gh: the glock holder |
3792ce97 | 2087 | * @fs_id_buf: pointer to file system id (if requested) |
b3b94faa | 2088 | * |
b3b94faa DT |
2089 | */ |
2090 | ||
3792ce97 BP |
2091 | static void dump_holder(struct seq_file *seq, const struct gfs2_holder *gh, |
2092 | const char *fs_id_buf) | |
b3b94faa | 2093 | { |
6802e340 | 2094 | struct task_struct *gh_owner = NULL; |
6802e340 | 2095 | char flags_buf[32]; |
b3b94faa | 2096 | |
0b3a2c99 | 2097 | rcu_read_lock(); |
6802e340 | 2098 | if (gh->gh_owner_pid) |
b1e058da | 2099 | gh_owner = pid_task(gh->gh_owner_pid, PIDTYPE_PID); |
3792ce97 BP |
2100 | gfs2_print_dbg(seq, "%s H: s:%s f:%s e:%d p:%ld [%s] %pS\n", |
2101 | fs_id_buf, state2str(gh->gh_state), | |
cc18152e JP |
2102 | hflags2str(flags_buf, gh->gh_flags, gh->gh_iflags), |
2103 | gh->gh_error, | |
2104 | gh->gh_owner_pid ? (long)pid_nr(gh->gh_owner_pid) : -1, | |
2105 | gh_owner ? gh_owner->comm : "(ended)", | |
2106 | (void *)gh->gh_ip); | |
0b3a2c99 | 2107 | rcu_read_unlock(); |
b3b94faa DT |
2108 | } |
2109 | ||
627c10b7 | 2110 | static const char *gflags2str(char *buf, const struct gfs2_glock *gl) |
6802e340 | 2111 | { |
627c10b7 | 2112 | const unsigned long *gflags = &gl->gl_flags; |
6802e340 | 2113 | char *p = buf; |
627c10b7 | 2114 | |
6802e340 SW |
2115 | if (test_bit(GLF_LOCK, gflags)) |
2116 | *p++ = 'l'; | |
6802e340 SW |
2117 | if (test_bit(GLF_DEMOTE, gflags)) |
2118 | *p++ = 'D'; | |
2119 | if (test_bit(GLF_PENDING_DEMOTE, gflags)) | |
2120 | *p++ = 'd'; | |
2121 | if (test_bit(GLF_DEMOTE_IN_PROGRESS, gflags)) | |
2122 | *p++ = 'p'; | |
2123 | if (test_bit(GLF_DIRTY, gflags)) | |
2124 | *p++ = 'y'; | |
2125 | if (test_bit(GLF_LFLUSH, gflags)) | |
2126 | *p++ = 'f'; | |
2127 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, gflags)) | |
2128 | *p++ = 'i'; | |
2129 | if (test_bit(GLF_REPLY_PENDING, gflags)) | |
2130 | *p++ = 'r'; | |
f057f6cd | 2131 | if (test_bit(GLF_INITIAL, gflags)) |
d8348de0 | 2132 | *p++ = 'I'; |
f057f6cd SW |
2133 | if (test_bit(GLF_FROZEN, gflags)) |
2134 | *p++ = 'F'; | |
e2c6c8a7 | 2135 | if (!list_empty(&gl->gl_holders)) |
7b5e3d5f | 2136 | *p++ = 'q'; |
627c10b7 SW |
2137 | if (test_bit(GLF_LRU, gflags)) |
2138 | *p++ = 'L'; | |
2139 | if (gl->gl_object) | |
2140 | *p++ = 'o'; | |
a245769f SW |
2141 | if (test_bit(GLF_BLOCKING, gflags)) |
2142 | *p++ = 'b'; | |
5deaf1f6 BP |
2143 | if (test_bit(GLF_PENDING_DELETE, gflags)) |
2144 | *p++ = 'P'; | |
2145 | if (test_bit(GLF_FREEING, gflags)) | |
2146 | *p++ = 'x'; | |
6802e340 SW |
2147 | *p = 0; |
2148 | return buf; | |
b3b94faa DT |
2149 | } |
2150 | ||
2151 | /** | |
8eae1ca0 | 2152 | * gfs2_dump_glock - print information about a glock |
6802e340 | 2153 | * @seq: The seq_file struct |
b3b94faa | 2154 | * @gl: the glock |
3792ce97 | 2155 | * @fsid: If true, also dump the file system id |
6802e340 SW |
2156 | * |
2157 | * The file format is as follows: | |
2158 | * One line per object, capital letters are used to indicate objects | |
2159 | * G = glock, I = Inode, R = rgrp, H = holder. Glocks are not indented, | |
2160 | * other objects are indented by a single space and follow the glock to | |
2161 | * which they are related. Fields are indicated by lower case letters | |
2162 | * followed by a colon and the field value, except for strings which are in | |
2163 | * [] so that its possible to see if they are composed of spaces for | |
2164 | * example. The field's are n = number (id of the object), f = flags, | |
2165 | * t = type, s = state, r = refcount, e = error, p = pid. | |
b3b94faa | 2166 | * |
b3b94faa DT |
2167 | */ |
2168 | ||
3792ce97 | 2169 | void gfs2_dump_glock(struct seq_file *seq, struct gfs2_glock *gl, bool fsid) |
b3b94faa | 2170 | { |
6802e340 SW |
2171 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
2172 | unsigned long long dtime; | |
2173 | const struct gfs2_holder *gh; | |
2174 | char gflags_buf[32]; | |
3792ce97 | 2175 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
98fb0574 | 2176 | char fs_id_buf[sizeof(sdp->sd_fsname) + 7]; |
7e901d6e | 2177 | unsigned long nrpages = 0; |
b3b94faa | 2178 | |
7e901d6e BP |
2179 | if (gl->gl_ops->go_flags & GLOF_ASPACE) { |
2180 | struct address_space *mapping = gfs2_glock2aspace(gl); | |
2181 | ||
2182 | nrpages = mapping->nrpages; | |
2183 | } | |
3792ce97 BP |
2184 | memset(fs_id_buf, 0, sizeof(fs_id_buf)); |
2185 | if (fsid && sdp) /* safety precaution */ | |
2186 | sprintf(fs_id_buf, "fsid=%s: ", sdp->sd_fsname); | |
6802e340 SW |
2187 | dtime = jiffies - gl->gl_demote_time; |
2188 | dtime *= 1000000/HZ; /* demote time in uSec */ | |
2189 | if (!test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
2190 | dtime = 0; | |
3792ce97 | 2191 | gfs2_print_dbg(seq, "%sG: s:%s n:%u/%llx f:%s t:%s d:%s/%llu a:%d " |
7e901d6e BP |
2192 | "v:%d r:%d m:%ld p:%lu\n", |
2193 | fs_id_buf, state2str(gl->gl_state), | |
2194 | gl->gl_name.ln_type, | |
2195 | (unsigned long long)gl->gl_name.ln_number, | |
2196 | gflags2str(gflags_buf, gl), | |
2197 | state2str(gl->gl_target), | |
2198 | state2str(gl->gl_demote_state), dtime, | |
2199 | atomic_read(&gl->gl_ail_count), | |
2200 | atomic_read(&gl->gl_revokes), | |
2201 | (int)gl->gl_lockref.count, gl->gl_hold_time, nrpages); | |
b3b94faa | 2202 | |
ac3beb6a | 2203 | list_for_each_entry(gh, &gl->gl_holders, gh_list) |
3792ce97 | 2204 | dump_holder(seq, gh, fs_id_buf); |
ac3beb6a | 2205 | |
6802e340 | 2206 | if (gl->gl_state != LM_ST_UNLOCKED && glops->go_dump) |
3792ce97 | 2207 | glops->go_dump(seq, gl, fs_id_buf); |
b3b94faa DT |
2208 | } |
2209 | ||
a245769f SW |
2210 | static int gfs2_glstats_seq_show(struct seq_file *seq, void *iter_ptr) |
2211 | { | |
2212 | struct gfs2_glock *gl = iter_ptr; | |
2213 | ||
4d207133 | 2214 | seq_printf(seq, "G: n:%u/%llx rtt:%llu/%llu rttb:%llu/%llu irt:%llu/%llu dcnt: %llu qcnt: %llu\n", |
a245769f SW |
2215 | gl->gl_name.ln_type, |
2216 | (unsigned long long)gl->gl_name.ln_number, | |
4d207133 BH |
2217 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTT], |
2218 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTVAR], | |
2219 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTB], | |
2220 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTVARB], | |
2221 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SIRT], | |
2222 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SIRTVAR], | |
2223 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_DCOUNT], | |
2224 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_QCOUNT]); | |
a245769f SW |
2225 | return 0; |
2226 | } | |
2227 | ||
2228 | static const char *gfs2_gltype[] = { | |
2229 | "type", | |
2230 | "reserved", | |
2231 | "nondisk", | |
2232 | "inode", | |
2233 | "rgrp", | |
2234 | "meta", | |
2235 | "iopen", | |
2236 | "flock", | |
2237 | "plock", | |
2238 | "quota", | |
2239 | "journal", | |
2240 | }; | |
2241 | ||
2242 | static const char *gfs2_stype[] = { | |
2243 | [GFS2_LKS_SRTT] = "srtt", | |
2244 | [GFS2_LKS_SRTTVAR] = "srttvar", | |
2245 | [GFS2_LKS_SRTTB] = "srttb", | |
2246 | [GFS2_LKS_SRTTVARB] = "srttvarb", | |
2247 | [GFS2_LKS_SIRT] = "sirt", | |
2248 | [GFS2_LKS_SIRTVAR] = "sirtvar", | |
2249 | [GFS2_LKS_DCOUNT] = "dlm", | |
2250 | [GFS2_LKS_QCOUNT] = "queue", | |
2251 | }; | |
2252 | ||
2253 | #define GFS2_NR_SBSTATS (ARRAY_SIZE(gfs2_gltype) * ARRAY_SIZE(gfs2_stype)) | |
2254 | ||
2255 | static int gfs2_sbstats_seq_show(struct seq_file *seq, void *iter_ptr) | |
2256 | { | |
81648d04 AG |
2257 | struct gfs2_sbd *sdp = seq->private; |
2258 | loff_t pos = *(loff_t *)iter_ptr; | |
2259 | unsigned index = pos >> 3; | |
2260 | unsigned subindex = pos & 0x07; | |
a245769f SW |
2261 | int i; |
2262 | ||
2263 | if (index == 0 && subindex != 0) | |
2264 | return 0; | |
6802e340 | 2265 | |
a245769f SW |
2266 | seq_printf(seq, "%-10s %8s:", gfs2_gltype[index], |
2267 | (index == 0) ? "cpu": gfs2_stype[subindex]); | |
b3b94faa | 2268 | |
a245769f SW |
2269 | for_each_possible_cpu(i) { |
2270 | const struct gfs2_pcpu_lkstats *lkstats = per_cpu_ptr(sdp->sd_lkstats, i); | |
8f7e0a80 AG |
2271 | |
2272 | if (index == 0) | |
2273 | seq_printf(seq, " %15u", i); | |
2274 | else | |
2275 | seq_printf(seq, " %15llu", (unsigned long long)lkstats-> | |
2276 | lkstats[index - 1].stats[subindex]); | |
a245769f SW |
2277 | } |
2278 | seq_putc(seq, '\n'); | |
2279 | return 0; | |
2280 | } | |
8fbbfd21 | 2281 | |
85d1da67 SW |
2282 | int __init gfs2_glock_init(void) |
2283 | { | |
0515480a | 2284 | int i, ret; |
88ffbf3e BP |
2285 | |
2286 | ret = rhashtable_init(&gl_hash_table, &ht_parms); | |
2287 | if (ret < 0) | |
2288 | return ret; | |
8fbbfd21 | 2289 | |
d2115778 | 2290 | glock_workqueue = alloc_workqueue("glock_workqueue", WQ_MEM_RECLAIM | |
58a69cb4 | 2291 | WQ_HIGHPRI | WQ_FREEZABLE, 0); |
88ffbf3e BP |
2292 | if (!glock_workqueue) { |
2293 | rhashtable_destroy(&gl_hash_table); | |
dfc4616d | 2294 | return -ENOMEM; |
88ffbf3e | 2295 | } |
d2115778 | 2296 | gfs2_delete_workqueue = alloc_workqueue("delete_workqueue", |
58a69cb4 | 2297 | WQ_MEM_RECLAIM | WQ_FREEZABLE, |
d2115778 | 2298 | 0); |
dfc4616d | 2299 | if (!gfs2_delete_workqueue) { |
b94a170e | 2300 | destroy_workqueue(glock_workqueue); |
88ffbf3e | 2301 | rhashtable_destroy(&gl_hash_table); |
dfc4616d | 2302 | return -ENOMEM; |
b94a170e | 2303 | } |
97cc1025 | 2304 | |
e0d735c1 CY |
2305 | ret = register_shrinker(&glock_shrinker); |
2306 | if (ret) { | |
2307 | destroy_workqueue(gfs2_delete_workqueue); | |
2308 | destroy_workqueue(glock_workqueue); | |
2309 | rhashtable_destroy(&gl_hash_table); | |
2310 | return ret; | |
2311 | } | |
c4f68a13 | 2312 | |
0515480a AG |
2313 | for (i = 0; i < GLOCK_WAIT_TABLE_SIZE; i++) |
2314 | init_waitqueue_head(glock_wait_table + i); | |
2315 | ||
85d1da67 SW |
2316 | return 0; |
2317 | } | |
2318 | ||
8fbbfd21 SW |
2319 | void gfs2_glock_exit(void) |
2320 | { | |
97cc1025 | 2321 | unregister_shrinker(&glock_shrinker); |
88ffbf3e | 2322 | rhashtable_destroy(&gl_hash_table); |
c4f68a13 | 2323 | destroy_workqueue(glock_workqueue); |
b94a170e | 2324 | destroy_workqueue(gfs2_delete_workqueue); |
8fbbfd21 SW |
2325 | } |
2326 | ||
7ac07fda | 2327 | static void gfs2_glock_iter_next(struct gfs2_glock_iter *gi, loff_t n) |
bc015cb8 | 2328 | { |
3fd5d3ad AG |
2329 | struct gfs2_glock *gl = gi->gl; |
2330 | ||
2331 | if (gl) { | |
2332 | if (n == 0) | |
2333 | return; | |
2334 | if (!lockref_put_not_zero(&gl->gl_lockref)) | |
2335 | gfs2_glock_queue_put(gl); | |
7ac07fda AG |
2336 | } |
2337 | for (;;) { | |
3fd5d3ad AG |
2338 | gl = rhashtable_walk_next(&gi->hti); |
2339 | if (IS_ERR_OR_NULL(gl)) { | |
2340 | if (gl == ERR_PTR(-EAGAIN)) { | |
2341 | n = 1; | |
2342 | continue; | |
7ac07fda | 2343 | } |
3fd5d3ad AG |
2344 | gl = NULL; |
2345 | break; | |
2346 | } | |
2347 | if (gl->gl_name.ln_sbd != gi->sdp) | |
2348 | continue; | |
2349 | if (n <= 1) { | |
2350 | if (!lockref_get_not_dead(&gl->gl_lockref)) | |
2351 | continue; | |
2352 | break; | |
2353 | } else { | |
2354 | if (__lockref_is_dead(&gl->gl_lockref)) | |
2355 | continue; | |
2356 | n--; | |
bc015cb8 | 2357 | } |
14d37564 | 2358 | } |
3fd5d3ad | 2359 | gi->gl = gl; |
7c52b166 RP |
2360 | } |
2361 | ||
6802e340 | 2362 | static void *gfs2_glock_seq_start(struct seq_file *seq, loff_t *pos) |
27c3b415 | 2363 | __acquires(RCU) |
7c52b166 | 2364 | { |
6802e340 | 2365 | struct gfs2_glock_iter *gi = seq->private; |
7ac07fda | 2366 | loff_t n; |
ba1ddcb6 | 2367 | |
7ac07fda AG |
2368 | /* |
2369 | * We can either stay where we are, skip to the next hash table | |
2370 | * entry, or start from the beginning. | |
2371 | */ | |
2372 | if (*pos < gi->last_pos) { | |
2373 | rhashtable_walk_exit(&gi->hti); | |
2374 | rhashtable_walk_enter(&gl_hash_table, &gi->hti); | |
2375 | n = *pos + 1; | |
2376 | } else { | |
2377 | n = *pos - gi->last_pos; | |
2378 | } | |
7c52b166 | 2379 | |
7ac07fda | 2380 | rhashtable_walk_start(&gi->hti); |
7c52b166 | 2381 | |
7ac07fda | 2382 | gfs2_glock_iter_next(gi, n); |
ba1ddcb6 | 2383 | gi->last_pos = *pos; |
6802e340 | 2384 | return gi->gl; |
7c52b166 RP |
2385 | } |
2386 | ||
6802e340 | 2387 | static void *gfs2_glock_seq_next(struct seq_file *seq, void *iter_ptr, |
7c52b166 RP |
2388 | loff_t *pos) |
2389 | { | |
6802e340 | 2390 | struct gfs2_glock_iter *gi = seq->private; |
7c52b166 RP |
2391 | |
2392 | (*pos)++; | |
ba1ddcb6 | 2393 | gi->last_pos = *pos; |
7ac07fda | 2394 | gfs2_glock_iter_next(gi, 1); |
6802e340 | 2395 | return gi->gl; |
7c52b166 RP |
2396 | } |
2397 | ||
6802e340 | 2398 | static void gfs2_glock_seq_stop(struct seq_file *seq, void *iter_ptr) |
27c3b415 | 2399 | __releases(RCU) |
7c52b166 | 2400 | { |
6802e340 | 2401 | struct gfs2_glock_iter *gi = seq->private; |
bc015cb8 | 2402 | |
88ffbf3e | 2403 | rhashtable_walk_stop(&gi->hti); |
7c52b166 RP |
2404 | } |
2405 | ||
6802e340 | 2406 | static int gfs2_glock_seq_show(struct seq_file *seq, void *iter_ptr) |
7c52b166 | 2407 | { |
3792ce97 | 2408 | dump_glock(seq, iter_ptr, false); |
ac3beb6a | 2409 | return 0; |
7c52b166 RP |
2410 | } |
2411 | ||
a245769f SW |
2412 | static void *gfs2_sbstats_seq_start(struct seq_file *seq, loff_t *pos) |
2413 | { | |
81648d04 | 2414 | preempt_disable(); |
a245769f SW |
2415 | if (*pos >= GFS2_NR_SBSTATS) |
2416 | return NULL; | |
81648d04 | 2417 | return pos; |
a245769f SW |
2418 | } |
2419 | ||
2420 | static void *gfs2_sbstats_seq_next(struct seq_file *seq, void *iter_ptr, | |
2421 | loff_t *pos) | |
2422 | { | |
a245769f | 2423 | (*pos)++; |
81648d04 | 2424 | if (*pos >= GFS2_NR_SBSTATS) |
a245769f | 2425 | return NULL; |
81648d04 | 2426 | return pos; |
a245769f SW |
2427 | } |
2428 | ||
2429 | static void gfs2_sbstats_seq_stop(struct seq_file *seq, void *iter_ptr) | |
2430 | { | |
2431 | preempt_enable(); | |
2432 | } | |
2433 | ||
4ef29002 | 2434 | static const struct seq_operations gfs2_glock_seq_ops = { |
7c52b166 RP |
2435 | .start = gfs2_glock_seq_start, |
2436 | .next = gfs2_glock_seq_next, | |
2437 | .stop = gfs2_glock_seq_stop, | |
2438 | .show = gfs2_glock_seq_show, | |
2439 | }; | |
2440 | ||
a245769f SW |
2441 | static const struct seq_operations gfs2_glstats_seq_ops = { |
2442 | .start = gfs2_glock_seq_start, | |
2443 | .next = gfs2_glock_seq_next, | |
2444 | .stop = gfs2_glock_seq_stop, | |
2445 | .show = gfs2_glstats_seq_show, | |
2446 | }; | |
2447 | ||
e8a8023e | 2448 | static const struct seq_operations gfs2_sbstats_sops = { |
a245769f SW |
2449 | .start = gfs2_sbstats_seq_start, |
2450 | .next = gfs2_sbstats_seq_next, | |
2451 | .stop = gfs2_sbstats_seq_stop, | |
2452 | .show = gfs2_sbstats_seq_show, | |
2453 | }; | |
2454 | ||
0fe2f1e9 SW |
2455 | #define GFS2_SEQ_GOODSIZE min(PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER, 65536UL) |
2456 | ||
92ecd73a AG |
2457 | static int __gfs2_glocks_open(struct inode *inode, struct file *file, |
2458 | const struct seq_operations *ops) | |
7c52b166 | 2459 | { |
92ecd73a | 2460 | int ret = seq_open_private(file, ops, sizeof(struct gfs2_glock_iter)); |
6802e340 SW |
2461 | if (ret == 0) { |
2462 | struct seq_file *seq = file->private_data; | |
2463 | struct gfs2_glock_iter *gi = seq->private; | |
88ffbf3e | 2464 | |
6802e340 | 2465 | gi->sdp = inode->i_private; |
0fe2f1e9 | 2466 | seq->buf = kmalloc(GFS2_SEQ_GOODSIZE, GFP_KERNEL | __GFP_NOWARN); |
df5d2f55 | 2467 | if (seq->buf) |
0fe2f1e9 | 2468 | seq->size = GFS2_SEQ_GOODSIZE; |
7ac07fda AG |
2469 | /* |
2470 | * Initially, we are "before" the first hash table entry; the | |
2471 | * first call to rhashtable_walk_next gets us the first entry. | |
2472 | */ | |
2473 | gi->last_pos = -1; | |
88ffbf3e | 2474 | gi->gl = NULL; |
7ac07fda | 2475 | rhashtable_walk_enter(&gl_hash_table, &gi->hti); |
6802e340 SW |
2476 | } |
2477 | return ret; | |
7c52b166 RP |
2478 | } |
2479 | ||
92ecd73a AG |
2480 | static int gfs2_glocks_open(struct inode *inode, struct file *file) |
2481 | { | |
2482 | return __gfs2_glocks_open(inode, file, &gfs2_glock_seq_ops); | |
2483 | } | |
2484 | ||
88ffbf3e BP |
2485 | static int gfs2_glocks_release(struct inode *inode, struct file *file) |
2486 | { | |
2487 | struct seq_file *seq = file->private_data; | |
2488 | struct gfs2_glock_iter *gi = seq->private; | |
2489 | ||
3fd5d3ad AG |
2490 | if (gi->gl) |
2491 | gfs2_glock_put(gi->gl); | |
7ac07fda | 2492 | rhashtable_walk_exit(&gi->hti); |
88ffbf3e BP |
2493 | return seq_release_private(inode, file); |
2494 | } | |
2495 | ||
a245769f SW |
2496 | static int gfs2_glstats_open(struct inode *inode, struct file *file) |
2497 | { | |
92ecd73a | 2498 | return __gfs2_glocks_open(inode, file, &gfs2_glstats_seq_ops); |
a245769f SW |
2499 | } |
2500 | ||
a245769f SW |
2501 | static const struct file_operations gfs2_glocks_fops = { |
2502 | .owner = THIS_MODULE, | |
2503 | .open = gfs2_glocks_open, | |
2504 | .read = seq_read, | |
2505 | .llseek = seq_lseek, | |
88ffbf3e | 2506 | .release = gfs2_glocks_release, |
a245769f SW |
2507 | }; |
2508 | ||
2509 | static const struct file_operations gfs2_glstats_fops = { | |
7c52b166 | 2510 | .owner = THIS_MODULE, |
a245769f SW |
2511 | .open = gfs2_glstats_open, |
2512 | .read = seq_read, | |
2513 | .llseek = seq_lseek, | |
88ffbf3e | 2514 | .release = gfs2_glocks_release, |
a245769f SW |
2515 | }; |
2516 | ||
e8a8023e | 2517 | DEFINE_SEQ_ATTRIBUTE(gfs2_sbstats); |
7c52b166 | 2518 | |
2abbf9a4 GKH |
2519 | void gfs2_create_debugfs_file(struct gfs2_sbd *sdp) |
2520 | { | |
2521 | sdp->debugfs_dir = debugfs_create_dir(sdp->sd_table_name, gfs2_root); | |
7c52b166 | 2522 | |
2abbf9a4 GKH |
2523 | debugfs_create_file("glocks", S_IFREG | S_IRUGO, sdp->debugfs_dir, sdp, |
2524 | &gfs2_glocks_fops); | |
2525 | ||
2526 | debugfs_create_file("glstats", S_IFREG | S_IRUGO, sdp->debugfs_dir, sdp, | |
2527 | &gfs2_glstats_fops); | |
2528 | ||
2529 | debugfs_create_file("sbstats", S_IFREG | S_IRUGO, sdp->debugfs_dir, sdp, | |
2530 | &gfs2_sbstats_fops); | |
7c52b166 RP |
2531 | } |
2532 | ||
2533 | void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp) | |
2534 | { | |
2abbf9a4 GKH |
2535 | debugfs_remove_recursive(sdp->debugfs_dir); |
2536 | sdp->debugfs_dir = NULL; | |
7c52b166 RP |
2537 | } |
2538 | ||
2abbf9a4 | 2539 | void gfs2_register_debugfs(void) |
7c52b166 RP |
2540 | { |
2541 | gfs2_root = debugfs_create_dir("gfs2", NULL); | |
7c52b166 RP |
2542 | } |
2543 | ||
2544 | void gfs2_unregister_debugfs(void) | |
2545 | { | |
2546 | debugfs_remove(gfs2_root); | |
5f882096 | 2547 | gfs2_root = NULL; |
7c52b166 | 2548 | } |