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Commit | Line | Data |
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b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
cf45b752 | 3 | * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. |
b3b94faa DT |
4 | * |
5 | * This copyrighted material is made available to anyone wishing to use, | |
6 | * modify, copy, or redistribute it subject to the terms and conditions | |
e9fc2aa0 | 7 | * of the GNU General Public License version 2. |
b3b94faa DT |
8 | */ |
9 | ||
10 | #include <linux/sched.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/spinlock.h> | |
b3b94faa DT |
13 | #include <linux/buffer_head.h> |
14 | #include <linux/delay.h> | |
15 | #include <linux/sort.h> | |
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> |
b3b94faa | 22 | #include <asm/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> |
b3b94faa DT |
33 | |
34 | #include "gfs2.h" | |
5c676f6d | 35 | #include "incore.h" |
b3b94faa DT |
36 | #include "glock.h" |
37 | #include "glops.h" | |
38 | #include "inode.h" | |
b3b94faa DT |
39 | #include "lops.h" |
40 | #include "meta_io.h" | |
41 | #include "quota.h" | |
42 | #include "super.h" | |
5c676f6d | 43 | #include "util.h" |
813e0c46 | 44 | #include "bmap.h" |
63997775 SW |
45 | #define CREATE_TRACE_POINTS |
46 | #include "trace_gfs2.h" | |
b3b94faa | 47 | |
6802e340 | 48 | struct gfs2_glock_iter { |
ba1ddcb6 SW |
49 | int hash; /* hash bucket index */ |
50 | unsigned nhash; /* Index within current bucket */ | |
51 | struct gfs2_sbd *sdp; /* incore superblock */ | |
52 | struct gfs2_glock *gl; /* current glock struct */ | |
53 | loff_t last_pos; /* last position */ | |
7c52b166 RP |
54 | }; |
55 | ||
b3b94faa DT |
56 | typedef void (*glock_examiner) (struct gfs2_glock * gl); |
57 | ||
6802e340 | 58 | static void do_xmote(struct gfs2_glock *gl, struct gfs2_holder *gh, unsigned int target); |
c4f68a13 | 59 | |
7c52b166 | 60 | static struct dentry *gfs2_root; |
c4f68a13 | 61 | static struct workqueue_struct *glock_workqueue; |
b94a170e | 62 | struct workqueue_struct *gfs2_delete_workqueue; |
97cc1025 SW |
63 | static LIST_HEAD(lru_list); |
64 | static atomic_t lru_count = ATOMIC_INIT(0); | |
eb8374e7 | 65 | static DEFINE_SPINLOCK(lru_lock); |
08bc2dbc | 66 | |
b6397893 | 67 | #define GFS2_GL_HASH_SHIFT 15 |
087efdd3 SW |
68 | #define GFS2_GL_HASH_SIZE (1 << GFS2_GL_HASH_SHIFT) |
69 | #define GFS2_GL_HASH_MASK (GFS2_GL_HASH_SIZE - 1) | |
70 | ||
bc015cb8 | 71 | static struct hlist_bl_head gl_hash_table[GFS2_GL_HASH_SIZE]; |
04b933f2 | 72 | static struct dentry *gfs2_root; |
087efdd3 | 73 | |
b3b94faa DT |
74 | /** |
75 | * gl_hash() - Turn glock number into hash bucket number | |
76 | * @lock: The glock number | |
77 | * | |
78 | * Returns: The number of the corresponding hash bucket | |
79 | */ | |
80 | ||
b8547856 SW |
81 | static unsigned int gl_hash(const struct gfs2_sbd *sdp, |
82 | const struct lm_lockname *name) | |
b3b94faa DT |
83 | { |
84 | unsigned int h; | |
85 | ||
cd915493 | 86 | h = jhash(&name->ln_number, sizeof(u64), 0); |
b3b94faa | 87 | h = jhash(&name->ln_type, sizeof(unsigned int), h); |
b8547856 | 88 | h = jhash(&sdp, sizeof(struct gfs2_sbd *), h); |
b3b94faa DT |
89 | h &= GFS2_GL_HASH_MASK; |
90 | ||
91 | return h; | |
92 | } | |
93 | ||
bc015cb8 SW |
94 | static inline void spin_lock_bucket(unsigned int hash) |
95 | { | |
1879fd6a | 96 | hlist_bl_lock(&gl_hash_table[hash]); |
bc015cb8 | 97 | } |
b3b94faa | 98 | |
bc015cb8 SW |
99 | static inline void spin_unlock_bucket(unsigned int hash) |
100 | { | |
1879fd6a | 101 | hlist_bl_unlock(&gl_hash_table[hash]); |
bc015cb8 | 102 | } |
b3b94faa | 103 | |
fc0e38da | 104 | static void gfs2_glock_dealloc(struct rcu_head *rcu) |
b3b94faa | 105 | { |
bc015cb8 | 106 | struct gfs2_glock *gl = container_of(rcu, struct gfs2_glock, gl_rcu); |
b3b94faa | 107 | |
dba2d70c | 108 | if (gl->gl_ops->go_flags & GLOF_ASPACE) { |
bc015cb8 | 109 | kmem_cache_free(gfs2_glock_aspace_cachep, gl); |
dba2d70c | 110 | } else { |
4e2f8849 | 111 | kfree(gl->gl_lksb.sb_lvbptr); |
bc015cb8 | 112 | kmem_cache_free(gfs2_glock_cachep, gl); |
dba2d70c | 113 | } |
fc0e38da SW |
114 | } |
115 | ||
116 | void gfs2_glock_free(struct gfs2_glock *gl) | |
b3b94faa DT |
117 | { |
118 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
b3b94faa | 119 | |
fc0e38da | 120 | call_rcu(&gl->gl_rcu, gfs2_glock_dealloc); |
bc015cb8 SW |
121 | if (atomic_dec_and_test(&sdp->sd_glock_disposal)) |
122 | wake_up(&sdp->sd_glock_wait); | |
b3b94faa DT |
123 | } |
124 | ||
125 | /** | |
126 | * gfs2_glock_hold() - increment reference count on glock | |
127 | * @gl: The glock to hold | |
128 | * | |
129 | */ | |
130 | ||
b94a170e | 131 | void gfs2_glock_hold(struct gfs2_glock *gl) |
b3b94faa | 132 | { |
d8348de0 | 133 | GLOCK_BUG_ON(gl, atomic_read(&gl->gl_ref) == 0); |
16feb9fe | 134 | atomic_inc(&gl->gl_ref); |
b3b94faa DT |
135 | } |
136 | ||
8ff22a6f BM |
137 | /** |
138 | * demote_ok - Check to see if it's ok to unlock a glock | |
139 | * @gl: the glock | |
140 | * | |
141 | * Returns: 1 if it's ok | |
142 | */ | |
143 | ||
144 | static int demote_ok(const struct gfs2_glock *gl) | |
145 | { | |
146 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
147 | ||
148 | if (gl->gl_state == LM_ST_UNLOCKED) | |
149 | return 0; | |
f42ab085 | 150 | if (!list_empty(&gl->gl_holders)) |
8ff22a6f BM |
151 | return 0; |
152 | if (glops->go_demote_ok) | |
153 | return glops->go_demote_ok(gl); | |
154 | return 1; | |
155 | } | |
156 | ||
bc015cb8 | 157 | |
29687a2a SW |
158 | void gfs2_glock_add_to_lru(struct gfs2_glock *gl) |
159 | { | |
160 | spin_lock(&lru_lock); | |
161 | ||
162 | if (!list_empty(&gl->gl_lru)) | |
163 | list_del_init(&gl->gl_lru); | |
164 | else | |
165 | atomic_inc(&lru_count); | |
166 | ||
167 | list_add_tail(&gl->gl_lru, &lru_list); | |
627c10b7 | 168 | set_bit(GLF_LRU, &gl->gl_flags); |
29687a2a SW |
169 | spin_unlock(&lru_lock); |
170 | } | |
171 | ||
4043b886 | 172 | static void __gfs2_glock_remove_from_lru(struct gfs2_glock *gl) |
f42ab085 | 173 | { |
f42ab085 SW |
174 | if (!list_empty(&gl->gl_lru)) { |
175 | list_del_init(&gl->gl_lru); | |
176 | atomic_dec(&lru_count); | |
177 | clear_bit(GLF_LRU, &gl->gl_flags); | |
178 | } | |
4043b886 SW |
179 | } |
180 | ||
181 | static void gfs2_glock_remove_from_lru(struct gfs2_glock *gl) | |
182 | { | |
183 | spin_lock(&lru_lock); | |
184 | __gfs2_glock_remove_from_lru(gl); | |
f42ab085 SW |
185 | spin_unlock(&lru_lock); |
186 | } | |
187 | ||
8ff22a6f BM |
188 | /** |
189 | * gfs2_glock_put_nolock() - Decrement reference count on glock | |
190 | * @gl: The glock to put | |
191 | * | |
192 | * This function should only be used if the caller has its own reference | |
193 | * to the glock, in addition to the one it is dropping. | |
194 | */ | |
195 | ||
b94a170e | 196 | void gfs2_glock_put_nolock(struct gfs2_glock *gl) |
8ff22a6f BM |
197 | { |
198 | if (atomic_dec_and_test(&gl->gl_ref)) | |
199 | GLOCK_BUG_ON(gl, 1); | |
8ff22a6f BM |
200 | } |
201 | ||
b3b94faa DT |
202 | /** |
203 | * gfs2_glock_put() - Decrement reference count on glock | |
204 | * @gl: The glock to put | |
205 | * | |
206 | */ | |
207 | ||
bc015cb8 | 208 | void gfs2_glock_put(struct gfs2_glock *gl) |
b3b94faa | 209 | { |
bc015cb8 SW |
210 | struct gfs2_sbd *sdp = gl->gl_sbd; |
211 | struct address_space *mapping = gfs2_glock2aspace(gl); | |
b3b94faa | 212 | |
4043b886 SW |
213 | if (atomic_dec_and_lock(&gl->gl_ref, &lru_lock)) { |
214 | __gfs2_glock_remove_from_lru(gl); | |
215 | spin_unlock(&lru_lock); | |
bc015cb8 SW |
216 | spin_lock_bucket(gl->gl_hash); |
217 | hlist_bl_del_rcu(&gl->gl_list); | |
218 | spin_unlock_bucket(gl->gl_hash); | |
6802e340 | 219 | GLOCK_BUG_ON(gl, !list_empty(&gl->gl_holders)); |
bc015cb8 SW |
220 | GLOCK_BUG_ON(gl, mapping && mapping->nrpages); |
221 | trace_gfs2_glock_put(gl); | |
222 | sdp->sd_lockstruct.ls_ops->lm_put_lock(gl); | |
b3b94faa | 223 | } |
b3b94faa DT |
224 | } |
225 | ||
b3b94faa DT |
226 | /** |
227 | * search_bucket() - Find struct gfs2_glock by lock number | |
228 | * @bucket: the bucket to search | |
229 | * @name: The lock name | |
230 | * | |
231 | * Returns: NULL, or the struct gfs2_glock with the requested number | |
232 | */ | |
233 | ||
37b2fa6a | 234 | static struct gfs2_glock *search_bucket(unsigned int hash, |
899be4d3 | 235 | const struct gfs2_sbd *sdp, |
d6a53727 | 236 | const struct lm_lockname *name) |
b3b94faa DT |
237 | { |
238 | struct gfs2_glock *gl; | |
bc015cb8 | 239 | struct hlist_bl_node *h; |
b3b94faa | 240 | |
bc015cb8 | 241 | hlist_bl_for_each_entry_rcu(gl, h, &gl_hash_table[hash], gl_list) { |
b3b94faa DT |
242 | if (!lm_name_equal(&gl->gl_name, name)) |
243 | continue; | |
899be4d3 SW |
244 | if (gl->gl_sbd != sdp) |
245 | continue; | |
bc015cb8 SW |
246 | if (atomic_inc_not_zero(&gl->gl_ref)) |
247 | return gl; | |
b3b94faa DT |
248 | } |
249 | ||
250 | return NULL; | |
251 | } | |
252 | ||
6802e340 SW |
253 | /** |
254 | * may_grant - check if its ok to grant a new lock | |
255 | * @gl: The glock | |
256 | * @gh: The lock request which we wish to grant | |
257 | * | |
258 | * Returns: true if its ok to grant the lock | |
259 | */ | |
260 | ||
261 | static inline int may_grant(const struct gfs2_glock *gl, const struct gfs2_holder *gh) | |
262 | { | |
263 | const struct gfs2_holder *gh_head = list_entry(gl->gl_holders.next, const struct gfs2_holder, gh_list); | |
264 | if ((gh->gh_state == LM_ST_EXCLUSIVE || | |
265 | gh_head->gh_state == LM_ST_EXCLUSIVE) && gh != gh_head) | |
266 | return 0; | |
267 | if (gl->gl_state == gh->gh_state) | |
268 | return 1; | |
269 | if (gh->gh_flags & GL_EXACT) | |
270 | return 0; | |
209806ab SW |
271 | if (gl->gl_state == LM_ST_EXCLUSIVE) { |
272 | if (gh->gh_state == LM_ST_SHARED && gh_head->gh_state == LM_ST_SHARED) | |
273 | return 1; | |
274 | if (gh->gh_state == LM_ST_DEFERRED && gh_head->gh_state == LM_ST_DEFERRED) | |
275 | return 1; | |
276 | } | |
6802e340 SW |
277 | if (gl->gl_state != LM_ST_UNLOCKED && (gh->gh_flags & LM_FLAG_ANY)) |
278 | return 1; | |
279 | return 0; | |
280 | } | |
281 | ||
282 | static void gfs2_holder_wake(struct gfs2_holder *gh) | |
283 | { | |
284 | clear_bit(HIF_WAIT, &gh->gh_iflags); | |
285 | smp_mb__after_clear_bit(); | |
286 | wake_up_bit(&gh->gh_iflags, HIF_WAIT); | |
287 | } | |
288 | ||
d5341a92 SW |
289 | /** |
290 | * do_error - Something unexpected has happened during a lock request | |
291 | * | |
292 | */ | |
293 | ||
294 | static inline void do_error(struct gfs2_glock *gl, const int ret) | |
295 | { | |
296 | struct gfs2_holder *gh, *tmp; | |
297 | ||
298 | list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) { | |
299 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
300 | continue; | |
301 | if (ret & LM_OUT_ERROR) | |
302 | gh->gh_error = -EIO; | |
303 | else if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) | |
304 | gh->gh_error = GLR_TRYFAILED; | |
305 | else | |
306 | continue; | |
307 | list_del_init(&gh->gh_list); | |
308 | trace_gfs2_glock_queue(gh, 0); | |
309 | gfs2_holder_wake(gh); | |
310 | } | |
311 | } | |
312 | ||
6802e340 SW |
313 | /** |
314 | * do_promote - promote as many requests as possible on the current queue | |
315 | * @gl: The glock | |
316 | * | |
813e0c46 SW |
317 | * Returns: 1 if there is a blocked holder at the head of the list, or 2 |
318 | * if a type specific operation is underway. | |
6802e340 SW |
319 | */ |
320 | ||
321 | static int do_promote(struct gfs2_glock *gl) | |
55ba474d HH |
322 | __releases(&gl->gl_spin) |
323 | __acquires(&gl->gl_spin) | |
6802e340 SW |
324 | { |
325 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
326 | struct gfs2_holder *gh, *tmp; | |
327 | int ret; | |
328 | ||
329 | restart: | |
330 | list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) { | |
331 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
332 | continue; | |
333 | if (may_grant(gl, gh)) { | |
334 | if (gh->gh_list.prev == &gl->gl_holders && | |
335 | glops->go_lock) { | |
336 | spin_unlock(&gl->gl_spin); | |
337 | /* FIXME: eliminate this eventually */ | |
338 | ret = glops->go_lock(gh); | |
339 | spin_lock(&gl->gl_spin); | |
340 | if (ret) { | |
813e0c46 SW |
341 | if (ret == 1) |
342 | return 2; | |
6802e340 SW |
343 | gh->gh_error = ret; |
344 | list_del_init(&gh->gh_list); | |
63997775 | 345 | trace_gfs2_glock_queue(gh, 0); |
6802e340 SW |
346 | gfs2_holder_wake(gh); |
347 | goto restart; | |
348 | } | |
349 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
63997775 | 350 | trace_gfs2_promote(gh, 1); |
6802e340 SW |
351 | gfs2_holder_wake(gh); |
352 | goto restart; | |
353 | } | |
354 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
63997775 | 355 | trace_gfs2_promote(gh, 0); |
6802e340 SW |
356 | gfs2_holder_wake(gh); |
357 | continue; | |
358 | } | |
359 | if (gh->gh_list.prev == &gl->gl_holders) | |
360 | return 1; | |
d5341a92 | 361 | do_error(gl, 0); |
6802e340 SW |
362 | break; |
363 | } | |
364 | return 0; | |
365 | } | |
366 | ||
6802e340 SW |
367 | /** |
368 | * find_first_waiter - find the first gh that's waiting for the glock | |
369 | * @gl: the glock | |
370 | */ | |
371 | ||
372 | static inline struct gfs2_holder *find_first_waiter(const struct gfs2_glock *gl) | |
373 | { | |
374 | struct gfs2_holder *gh; | |
375 | ||
376 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
377 | if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
378 | return gh; | |
379 | } | |
380 | return NULL; | |
381 | } | |
382 | ||
383 | /** | |
384 | * state_change - record that the glock is now in a different state | |
385 | * @gl: the glock | |
386 | * @new_state the new state | |
387 | * | |
388 | */ | |
389 | ||
390 | static void state_change(struct gfs2_glock *gl, unsigned int new_state) | |
391 | { | |
392 | int held1, held2; | |
393 | ||
394 | held1 = (gl->gl_state != LM_ST_UNLOCKED); | |
395 | held2 = (new_state != LM_ST_UNLOCKED); | |
396 | ||
397 | if (held1 != held2) { | |
398 | if (held2) | |
399 | gfs2_glock_hold(gl); | |
400 | else | |
8ff22a6f | 401 | gfs2_glock_put_nolock(gl); |
6802e340 | 402 | } |
7b5e3d5f SW |
403 | if (held1 && held2 && list_empty(&gl->gl_holders)) |
404 | clear_bit(GLF_QUEUED, &gl->gl_flags); | |
6802e340 | 405 | |
7cf8dcd3 BP |
406 | if (new_state != gl->gl_target) |
407 | /* shorten our minimum hold time */ | |
408 | gl->gl_hold_time = max(gl->gl_hold_time - GL_GLOCK_HOLD_DECR, | |
409 | GL_GLOCK_MIN_HOLD); | |
6802e340 SW |
410 | gl->gl_state = new_state; |
411 | gl->gl_tchange = jiffies; | |
412 | } | |
413 | ||
414 | static void gfs2_demote_wake(struct gfs2_glock *gl) | |
415 | { | |
416 | gl->gl_demote_state = LM_ST_EXCLUSIVE; | |
417 | clear_bit(GLF_DEMOTE, &gl->gl_flags); | |
418 | smp_mb__after_clear_bit(); | |
419 | wake_up_bit(&gl->gl_flags, GLF_DEMOTE); | |
420 | } | |
421 | ||
422 | /** | |
423 | * finish_xmote - The DLM has replied to one of our lock requests | |
424 | * @gl: The glock | |
425 | * @ret: The status from the DLM | |
426 | * | |
427 | */ | |
428 | ||
429 | static void finish_xmote(struct gfs2_glock *gl, unsigned int ret) | |
430 | { | |
431 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
432 | struct gfs2_holder *gh; | |
433 | unsigned state = ret & LM_OUT_ST_MASK; | |
813e0c46 | 434 | int rv; |
6802e340 SW |
435 | |
436 | spin_lock(&gl->gl_spin); | |
63997775 | 437 | trace_gfs2_glock_state_change(gl, state); |
6802e340 SW |
438 | state_change(gl, state); |
439 | gh = find_first_waiter(gl); | |
440 | ||
441 | /* Demote to UN request arrived during demote to SH or DF */ | |
442 | if (test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags) && | |
443 | state != LM_ST_UNLOCKED && gl->gl_demote_state == LM_ST_UNLOCKED) | |
444 | gl->gl_target = LM_ST_UNLOCKED; | |
445 | ||
446 | /* Check for state != intended state */ | |
447 | if (unlikely(state != gl->gl_target)) { | |
448 | if (gh && !test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)) { | |
449 | /* move to back of queue and try next entry */ | |
450 | if (ret & LM_OUT_CANCELED) { | |
451 | if ((gh->gh_flags & LM_FLAG_PRIORITY) == 0) | |
452 | list_move_tail(&gh->gh_list, &gl->gl_holders); | |
453 | gh = find_first_waiter(gl); | |
454 | gl->gl_target = gh->gh_state; | |
455 | goto retry; | |
456 | } | |
457 | /* Some error or failed "try lock" - report it */ | |
458 | if ((ret & LM_OUT_ERROR) || | |
459 | (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) { | |
460 | gl->gl_target = gl->gl_state; | |
461 | do_error(gl, ret); | |
462 | goto out; | |
463 | } | |
464 | } | |
465 | switch(state) { | |
466 | /* Unlocked due to conversion deadlock, try again */ | |
467 | case LM_ST_UNLOCKED: | |
468 | retry: | |
469 | do_xmote(gl, gh, gl->gl_target); | |
470 | break; | |
471 | /* Conversion fails, unlock and try again */ | |
472 | case LM_ST_SHARED: | |
473 | case LM_ST_DEFERRED: | |
474 | do_xmote(gl, gh, LM_ST_UNLOCKED); | |
475 | break; | |
476 | default: /* Everything else */ | |
477 | printk(KERN_ERR "GFS2: wanted %u got %u\n", gl->gl_target, state); | |
478 | GLOCK_BUG_ON(gl, 1); | |
479 | } | |
480 | spin_unlock(&gl->gl_spin); | |
6802e340 SW |
481 | return; |
482 | } | |
483 | ||
484 | /* Fast path - we got what we asked for */ | |
485 | if (test_and_clear_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)) | |
486 | gfs2_demote_wake(gl); | |
487 | if (state != LM_ST_UNLOCKED) { | |
488 | if (glops->go_xmote_bh) { | |
6802e340 SW |
489 | spin_unlock(&gl->gl_spin); |
490 | rv = glops->go_xmote_bh(gl, gh); | |
6802e340 SW |
491 | spin_lock(&gl->gl_spin); |
492 | if (rv) { | |
493 | do_error(gl, rv); | |
494 | goto out; | |
495 | } | |
496 | } | |
813e0c46 SW |
497 | rv = do_promote(gl); |
498 | if (rv == 2) | |
499 | goto out_locked; | |
6802e340 SW |
500 | } |
501 | out: | |
502 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
813e0c46 | 503 | out_locked: |
6802e340 | 504 | spin_unlock(&gl->gl_spin); |
6802e340 SW |
505 | } |
506 | ||
6802e340 SW |
507 | /** |
508 | * do_xmote - Calls the DLM to change the state of a lock | |
509 | * @gl: The lock state | |
510 | * @gh: The holder (only for promotes) | |
511 | * @target: The target lock state | |
512 | * | |
513 | */ | |
514 | ||
515 | static void do_xmote(struct gfs2_glock *gl, struct gfs2_holder *gh, unsigned int target) | |
55ba474d HH |
516 | __releases(&gl->gl_spin) |
517 | __acquires(&gl->gl_spin) | |
6802e340 SW |
518 | { |
519 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
520 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
521 | unsigned int lck_flags = gh ? gh->gh_flags : 0; | |
522 | int ret; | |
523 | ||
524 | lck_flags &= (LM_FLAG_TRY | LM_FLAG_TRY_1CB | LM_FLAG_NOEXP | | |
525 | LM_FLAG_PRIORITY); | |
921169ca SW |
526 | GLOCK_BUG_ON(gl, gl->gl_state == target); |
527 | GLOCK_BUG_ON(gl, gl->gl_state == gl->gl_target); | |
6802e340 SW |
528 | if ((target == LM_ST_UNLOCKED || target == LM_ST_DEFERRED) && |
529 | glops->go_inval) { | |
530 | set_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags); | |
531 | do_error(gl, 0); /* Fail queued try locks */ | |
532 | } | |
47a25380 | 533 | gl->gl_req = target; |
a245769f SW |
534 | set_bit(GLF_BLOCKING, &gl->gl_flags); |
535 | if ((gl->gl_req == LM_ST_UNLOCKED) || | |
536 | (gl->gl_state == LM_ST_EXCLUSIVE) || | |
537 | (lck_flags & (LM_FLAG_TRY|LM_FLAG_TRY_1CB))) | |
538 | clear_bit(GLF_BLOCKING, &gl->gl_flags); | |
6802e340 | 539 | spin_unlock(&gl->gl_spin); |
06dfc306 BP |
540 | if (glops->go_sync) |
541 | glops->go_sync(gl); | |
6802e340 SW |
542 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags)) |
543 | glops->go_inval(gl, target == LM_ST_DEFERRED ? 0 : DIO_METADATA); | |
544 | clear_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags); | |
545 | ||
546 | gfs2_glock_hold(gl); | |
921169ca SW |
547 | if (sdp->sd_lockstruct.ls_ops->lm_lock) { |
548 | /* lock_dlm */ | |
549 | ret = sdp->sd_lockstruct.ls_ops->lm_lock(gl, target, lck_flags); | |
dba2d70c DT |
550 | if (ret) { |
551 | printk(KERN_ERR "GFS2: lm_lock ret %d\n", ret); | |
552 | GLOCK_BUG_ON(gl, 1); | |
553 | } | |
921169ca SW |
554 | } else { /* lock_nolock */ |
555 | finish_xmote(gl, target); | |
6802e340 SW |
556 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
557 | gfs2_glock_put(gl); | |
6802e340 | 558 | } |
921169ca | 559 | |
6802e340 SW |
560 | spin_lock(&gl->gl_spin); |
561 | } | |
562 | ||
563 | /** | |
564 | * find_first_holder - find the first "holder" gh | |
565 | * @gl: the glock | |
566 | */ | |
567 | ||
568 | static inline struct gfs2_holder *find_first_holder(const struct gfs2_glock *gl) | |
569 | { | |
570 | struct gfs2_holder *gh; | |
571 | ||
572 | if (!list_empty(&gl->gl_holders)) { | |
573 | gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list); | |
574 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
575 | return gh; | |
576 | } | |
577 | return NULL; | |
578 | } | |
579 | ||
580 | /** | |
581 | * run_queue - do all outstanding tasks related to a glock | |
582 | * @gl: The glock in question | |
583 | * @nonblock: True if we must not block in run_queue | |
584 | * | |
585 | */ | |
586 | ||
587 | static void run_queue(struct gfs2_glock *gl, const int nonblock) | |
55ba474d HH |
588 | __releases(&gl->gl_spin) |
589 | __acquires(&gl->gl_spin) | |
6802e340 SW |
590 | { |
591 | struct gfs2_holder *gh = NULL; | |
813e0c46 | 592 | int ret; |
6802e340 SW |
593 | |
594 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) | |
595 | return; | |
596 | ||
597 | GLOCK_BUG_ON(gl, test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)); | |
598 | ||
599 | if (test_bit(GLF_DEMOTE, &gl->gl_flags) && | |
600 | gl->gl_demote_state != gl->gl_state) { | |
601 | if (find_first_holder(gl)) | |
d8348de0 | 602 | goto out_unlock; |
6802e340 SW |
603 | if (nonblock) |
604 | goto out_sched; | |
605 | set_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags); | |
265d529c | 606 | GLOCK_BUG_ON(gl, gl->gl_demote_state == LM_ST_EXCLUSIVE); |
6802e340 SW |
607 | gl->gl_target = gl->gl_demote_state; |
608 | } else { | |
609 | if (test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
610 | gfs2_demote_wake(gl); | |
813e0c46 SW |
611 | ret = do_promote(gl); |
612 | if (ret == 0) | |
d8348de0 | 613 | goto out_unlock; |
813e0c46 | 614 | if (ret == 2) |
a228df63 | 615 | goto out; |
6802e340 SW |
616 | gh = find_first_waiter(gl); |
617 | gl->gl_target = gh->gh_state; | |
618 | if (!(gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) | |
619 | do_error(gl, 0); /* Fail queued try locks */ | |
620 | } | |
621 | do_xmote(gl, gh, gl->gl_target); | |
a228df63 | 622 | out: |
6802e340 SW |
623 | return; |
624 | ||
625 | out_sched: | |
7e71c55e SW |
626 | clear_bit(GLF_LOCK, &gl->gl_flags); |
627 | smp_mb__after_clear_bit(); | |
6802e340 SW |
628 | gfs2_glock_hold(gl); |
629 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) | |
8ff22a6f | 630 | gfs2_glock_put_nolock(gl); |
7e71c55e SW |
631 | return; |
632 | ||
d8348de0 | 633 | out_unlock: |
6802e340 | 634 | clear_bit(GLF_LOCK, &gl->gl_flags); |
7e71c55e SW |
635 | smp_mb__after_clear_bit(); |
636 | return; | |
6802e340 SW |
637 | } |
638 | ||
b94a170e BM |
639 | static void delete_work_func(struct work_struct *work) |
640 | { | |
641 | struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_delete); | |
642 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
044b9414 | 643 | struct gfs2_inode *ip; |
b94a170e | 644 | struct inode *inode; |
044b9414 SW |
645 | u64 no_addr = gl->gl_name.ln_number; |
646 | ||
647 | ip = gl->gl_object; | |
648 | /* Note: Unsafe to dereference ip as we don't hold right refs/locks */ | |
b94a170e | 649 | |
b94a170e | 650 | if (ip) |
4667a0ec | 651 | inode = gfs2_ilookup(sdp->sd_vfs, no_addr, 1); |
044b9414 SW |
652 | else |
653 | inode = gfs2_lookup_by_inum(sdp, no_addr, NULL, GFS2_BLKST_UNLINKED); | |
654 | if (inode && !IS_ERR(inode)) { | |
655 | d_prune_aliases(inode); | |
656 | iput(inode); | |
b94a170e BM |
657 | } |
658 | gfs2_glock_put(gl); | |
659 | } | |
660 | ||
c4f68a13 BM |
661 | static void glock_work_func(struct work_struct *work) |
662 | { | |
6802e340 | 663 | unsigned long delay = 0; |
c4f68a13 | 664 | struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_work.work); |
26bb7505 | 665 | int drop_ref = 0; |
c4f68a13 | 666 | |
26bb7505 | 667 | if (test_and_clear_bit(GLF_REPLY_PENDING, &gl->gl_flags)) { |
6802e340 | 668 | finish_xmote(gl, gl->gl_reply); |
26bb7505 SW |
669 | drop_ref = 1; |
670 | } | |
c4f68a13 | 671 | spin_lock(&gl->gl_spin); |
f90e5b5b | 672 | if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && |
265d529c SW |
673 | gl->gl_state != LM_ST_UNLOCKED && |
674 | gl->gl_demote_state != LM_ST_EXCLUSIVE) { | |
6802e340 | 675 | unsigned long holdtime, now = jiffies; |
f90e5b5b | 676 | |
7cf8dcd3 | 677 | holdtime = gl->gl_tchange + gl->gl_hold_time; |
6802e340 SW |
678 | if (time_before(now, holdtime)) |
679 | delay = holdtime - now; | |
f90e5b5b BP |
680 | |
681 | if (!delay) { | |
682 | clear_bit(GLF_PENDING_DEMOTE, &gl->gl_flags); | |
683 | set_bit(GLF_DEMOTE, &gl->gl_flags); | |
684 | } | |
6802e340 SW |
685 | } |
686 | run_queue(gl, 0); | |
c4f68a13 | 687 | spin_unlock(&gl->gl_spin); |
7cf8dcd3 | 688 | if (!delay) |
6802e340 | 689 | gfs2_glock_put(gl); |
7cf8dcd3 BP |
690 | else { |
691 | if (gl->gl_name.ln_type != LM_TYPE_INODE) | |
692 | delay = 0; | |
693 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0) | |
694 | gfs2_glock_put(gl); | |
695 | } | |
26bb7505 SW |
696 | if (drop_ref) |
697 | gfs2_glock_put(gl); | |
c4f68a13 BM |
698 | } |
699 | ||
b3b94faa DT |
700 | /** |
701 | * gfs2_glock_get() - Get a glock, or create one if one doesn't exist | |
702 | * @sdp: The GFS2 superblock | |
703 | * @number: the lock number | |
704 | * @glops: The glock_operations to use | |
705 | * @create: If 0, don't create the glock if it doesn't exist | |
706 | * @glp: the glock is returned here | |
707 | * | |
708 | * This does not lock a glock, just finds/creates structures for one. | |
709 | * | |
710 | * Returns: errno | |
711 | */ | |
712 | ||
cd915493 | 713 | int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 | 714 | const struct gfs2_glock_operations *glops, int create, |
b3b94faa DT |
715 | struct gfs2_glock **glp) |
716 | { | |
009d8518 | 717 | struct super_block *s = sdp->sd_vfs; |
37b2fa6a | 718 | struct lm_lockname name = { .ln_number = number, .ln_type = glops->go_type }; |
b3b94faa | 719 | struct gfs2_glock *gl, *tmp; |
37b2fa6a | 720 | unsigned int hash = gl_hash(sdp, &name); |
009d8518 | 721 | struct address_space *mapping; |
bc015cb8 | 722 | struct kmem_cache *cachep; |
b3b94faa | 723 | |
bc015cb8 | 724 | rcu_read_lock(); |
37b2fa6a | 725 | gl = search_bucket(hash, sdp, &name); |
bc015cb8 | 726 | rcu_read_unlock(); |
b3b94faa | 727 | |
64d576ba SW |
728 | *glp = gl; |
729 | if (gl) | |
b3b94faa | 730 | return 0; |
64d576ba SW |
731 | if (!create) |
732 | return -ENOENT; | |
b3b94faa | 733 | |
009d8518 | 734 | if (glops->go_flags & GLOF_ASPACE) |
bc015cb8 | 735 | cachep = gfs2_glock_aspace_cachep; |
009d8518 | 736 | else |
bc015cb8 SW |
737 | cachep = gfs2_glock_cachep; |
738 | gl = kmem_cache_alloc(cachep, GFP_KERNEL); | |
b3b94faa DT |
739 | if (!gl) |
740 | return -ENOMEM; | |
741 | ||
dba2d70c | 742 | memset(&gl->gl_lksb, 0, sizeof(struct dlm_lksb)); |
dba2d70c DT |
743 | |
744 | if (glops->go_flags & GLOF_LVB) { | |
4e2f8849 DT |
745 | gl->gl_lksb.sb_lvbptr = kzalloc(GFS2_MIN_LVB_SIZE, GFP_KERNEL); |
746 | if (!gl->gl_lksb.sb_lvbptr) { | |
dba2d70c DT |
747 | kmem_cache_free(cachep, gl); |
748 | return -ENOMEM; | |
749 | } | |
dba2d70c DT |
750 | } |
751 | ||
8f05228e | 752 | atomic_inc(&sdp->sd_glock_disposal); |
a245769f | 753 | gl->gl_sbd = sdp; |
ec45d9f5 | 754 | gl->gl_flags = 0; |
b3b94faa | 755 | gl->gl_name = name; |
16feb9fe | 756 | atomic_set(&gl->gl_ref, 1); |
b3b94faa | 757 | gl->gl_state = LM_ST_UNLOCKED; |
6802e340 | 758 | gl->gl_target = LM_ST_UNLOCKED; |
c4f68a13 | 759 | gl->gl_demote_state = LM_ST_EXCLUSIVE; |
37b2fa6a | 760 | gl->gl_hash = hash; |
b3b94faa | 761 | gl->gl_ops = glops; |
a245769f SW |
762 | gl->gl_dstamp = ktime_set(0, 0); |
763 | preempt_disable(); | |
764 | /* We use the global stats to estimate the initial per-glock stats */ | |
765 | gl->gl_stats = this_cpu_ptr(sdp->sd_lkstats)->lkstats[glops->go_type]; | |
766 | preempt_enable(); | |
767 | gl->gl_stats.stats[GFS2_LKS_DCOUNT] = 0; | |
768 | gl->gl_stats.stats[GFS2_LKS_QCOUNT] = 0; | |
c4f68a13 | 769 | gl->gl_tchange = jiffies; |
ec45d9f5 | 770 | gl->gl_object = NULL; |
7cf8dcd3 | 771 | gl->gl_hold_time = GL_GLOCK_DFT_HOLD; |
c4f68a13 | 772 | INIT_DELAYED_WORK(&gl->gl_work, glock_work_func); |
b94a170e | 773 | INIT_WORK(&gl->gl_delete, delete_work_func); |
b3b94faa | 774 | |
009d8518 SW |
775 | mapping = gfs2_glock2aspace(gl); |
776 | if (mapping) { | |
777 | mapping->a_ops = &gfs2_meta_aops; | |
778 | mapping->host = s->s_bdev->bd_inode; | |
779 | mapping->flags = 0; | |
780 | mapping_set_gfp_mask(mapping, GFP_NOFS); | |
252aa6f5 | 781 | mapping->private_data = NULL; |
009d8518 SW |
782 | mapping->backing_dev_info = s->s_bdi; |
783 | mapping->writeback_index = 0; | |
b3b94faa DT |
784 | } |
785 | ||
bc015cb8 | 786 | spin_lock_bucket(hash); |
37b2fa6a | 787 | tmp = search_bucket(hash, sdp, &name); |
b3b94faa | 788 | if (tmp) { |
bc015cb8 | 789 | spin_unlock_bucket(hash); |
4e2f8849 | 790 | kfree(gl->gl_lksb.sb_lvbptr); |
bc015cb8 | 791 | kmem_cache_free(cachep, gl); |
fc0e38da | 792 | atomic_dec(&sdp->sd_glock_disposal); |
b3b94faa DT |
793 | gl = tmp; |
794 | } else { | |
bc015cb8 SW |
795 | hlist_bl_add_head_rcu(&gl->gl_list, &gl_hash_table[hash]); |
796 | spin_unlock_bucket(hash); | |
b3b94faa DT |
797 | } |
798 | ||
799 | *glp = gl; | |
800 | ||
801 | return 0; | |
b3b94faa DT |
802 | } |
803 | ||
804 | /** | |
805 | * gfs2_holder_init - initialize a struct gfs2_holder in the default way | |
806 | * @gl: the glock | |
807 | * @state: the state we're requesting | |
808 | * @flags: the modifier flags | |
809 | * @gh: the holder structure | |
810 | * | |
811 | */ | |
812 | ||
190562bd | 813 | void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags, |
b3b94faa DT |
814 | struct gfs2_holder *gh) |
815 | { | |
816 | INIT_LIST_HEAD(&gh->gh_list); | |
817 | gh->gh_gl = gl; | |
d0dc80db | 818 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
b1e058da | 819 | gh->gh_owner_pid = get_pid(task_pid(current)); |
b3b94faa DT |
820 | gh->gh_state = state; |
821 | gh->gh_flags = flags; | |
822 | gh->gh_error = 0; | |
823 | gh->gh_iflags = 0; | |
b3b94faa DT |
824 | gfs2_glock_hold(gl); |
825 | } | |
826 | ||
827 | /** | |
828 | * gfs2_holder_reinit - reinitialize a struct gfs2_holder so we can requeue it | |
829 | * @state: the state we're requesting | |
830 | * @flags: the modifier flags | |
831 | * @gh: the holder structure | |
832 | * | |
833 | * Don't mess with the glock. | |
834 | * | |
835 | */ | |
836 | ||
190562bd | 837 | void gfs2_holder_reinit(unsigned int state, unsigned flags, struct gfs2_holder *gh) |
b3b94faa DT |
838 | { |
839 | gh->gh_state = state; | |
579b78a4 | 840 | gh->gh_flags = flags; |
3b8249f6 | 841 | gh->gh_iflags = 0; |
d0dc80db | 842 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
1a0eae88 BP |
843 | if (gh->gh_owner_pid) |
844 | put_pid(gh->gh_owner_pid); | |
845 | gh->gh_owner_pid = get_pid(task_pid(current)); | |
b3b94faa DT |
846 | } |
847 | ||
848 | /** | |
849 | * gfs2_holder_uninit - uninitialize a holder structure (drop glock reference) | |
850 | * @gh: the holder structure | |
851 | * | |
852 | */ | |
853 | ||
854 | void gfs2_holder_uninit(struct gfs2_holder *gh) | |
855 | { | |
b1e058da | 856 | put_pid(gh->gh_owner_pid); |
b3b94faa DT |
857 | gfs2_glock_put(gh->gh_gl); |
858 | gh->gh_gl = NULL; | |
d0dc80db | 859 | gh->gh_ip = 0; |
b3b94faa DT |
860 | } |
861 | ||
fe64d517 SW |
862 | /** |
863 | * gfs2_glock_holder_wait | |
864 | * @word: unused | |
865 | * | |
866 | * This function and gfs2_glock_demote_wait both show up in the WCHAN | |
867 | * field. Thus I've separated these otherwise identical functions in | |
868 | * order to be more informative to the user. | |
869 | */ | |
870 | ||
871 | static int gfs2_glock_holder_wait(void *word) | |
fee852e3 SW |
872 | { |
873 | schedule(); | |
874 | return 0; | |
875 | } | |
876 | ||
fe64d517 SW |
877 | static int gfs2_glock_demote_wait(void *word) |
878 | { | |
879 | schedule(); | |
880 | return 0; | |
881 | } | |
882 | ||
07a79049 BP |
883 | /** |
884 | * gfs2_glock_wait - wait on a glock acquisition | |
885 | * @gh: the glock holder | |
886 | * | |
887 | * Returns: 0 on success | |
888 | */ | |
889 | ||
890 | int gfs2_glock_wait(struct gfs2_holder *gh) | |
da755fdb | 891 | { |
7cf8dcd3 BP |
892 | unsigned long time1 = jiffies; |
893 | ||
6802e340 | 894 | might_sleep(); |
fe64d517 | 895 | wait_on_bit(&gh->gh_iflags, HIF_WAIT, gfs2_glock_holder_wait, TASK_UNINTERRUPTIBLE); |
7cf8dcd3 BP |
896 | if (time_after(jiffies, time1 + HZ)) /* have we waited > a second? */ |
897 | /* Lengthen the minimum hold time. */ | |
898 | gh->gh_gl->gl_hold_time = min(gh->gh_gl->gl_hold_time + | |
899 | GL_GLOCK_HOLD_INCR, | |
900 | GL_GLOCK_MAX_HOLD); | |
07a79049 | 901 | return gh->gh_error; |
da755fdb SW |
902 | } |
903 | ||
b3b94faa | 904 | /** |
6802e340 SW |
905 | * handle_callback - process a demote request |
906 | * @gl: the glock | |
907 | * @state: the state the caller wants us to change to | |
b3b94faa | 908 | * |
6802e340 SW |
909 | * There are only two requests that we are going to see in actual |
910 | * practise: LM_ST_SHARED and LM_ST_UNLOCKED | |
b3b94faa DT |
911 | */ |
912 | ||
6802e340 | 913 | static void handle_callback(struct gfs2_glock *gl, unsigned int state, |
97cc1025 | 914 | unsigned long delay) |
b3b94faa | 915 | { |
6802e340 | 916 | int bit = delay ? GLF_PENDING_DEMOTE : GLF_DEMOTE; |
b3b94faa | 917 | |
6802e340 SW |
918 | set_bit(bit, &gl->gl_flags); |
919 | if (gl->gl_demote_state == LM_ST_EXCLUSIVE) { | |
920 | gl->gl_demote_state = state; | |
921 | gl->gl_demote_time = jiffies; | |
6802e340 SW |
922 | } else if (gl->gl_demote_state != LM_ST_UNLOCKED && |
923 | gl->gl_demote_state != state) { | |
924 | gl->gl_demote_state = LM_ST_UNLOCKED; | |
b3b94faa | 925 | } |
b94a170e BM |
926 | if (gl->gl_ops->go_callback) |
927 | gl->gl_ops->go_callback(gl); | |
63997775 | 928 | trace_gfs2_demote_rq(gl); |
b3b94faa DT |
929 | } |
930 | ||
6802e340 | 931 | void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...) |
7c52b166 | 932 | { |
5e69069c | 933 | struct va_format vaf; |
7c52b166 RP |
934 | va_list args; |
935 | ||
936 | va_start(args, fmt); | |
5e69069c | 937 | |
6802e340 | 938 | if (seq) { |
1bb49303 | 939 | seq_vprintf(seq, fmt, args); |
6802e340 | 940 | } else { |
5e69069c JP |
941 | vaf.fmt = fmt; |
942 | vaf.va = &args; | |
943 | ||
944 | printk(KERN_ERR " %pV", &vaf); | |
6802e340 | 945 | } |
5e69069c | 946 | |
7c52b166 RP |
947 | va_end(args); |
948 | } | |
949 | ||
b3b94faa DT |
950 | /** |
951 | * add_to_queue - Add a holder to the wait queue (but look for recursion) | |
952 | * @gh: the holder structure to add | |
953 | * | |
6802e340 SW |
954 | * Eventually we should move the recursive locking trap to a |
955 | * debugging option or something like that. This is the fast | |
956 | * path and needs to have the minimum number of distractions. | |
957 | * | |
b3b94faa DT |
958 | */ |
959 | ||
6802e340 | 960 | static inline void add_to_queue(struct gfs2_holder *gh) |
55ba474d HH |
961 | __releases(&gl->gl_spin) |
962 | __acquires(&gl->gl_spin) | |
b3b94faa DT |
963 | { |
964 | struct gfs2_glock *gl = gh->gh_gl; | |
6802e340 SW |
965 | struct gfs2_sbd *sdp = gl->gl_sbd; |
966 | struct list_head *insert_pt = NULL; | |
967 | struct gfs2_holder *gh2; | |
e5dc76b9 | 968 | int try_futile = 0; |
b3b94faa | 969 | |
b1e058da | 970 | BUG_ON(gh->gh_owner_pid == NULL); |
fee852e3 SW |
971 | if (test_and_set_bit(HIF_WAIT, &gh->gh_iflags)) |
972 | BUG(); | |
190562bd | 973 | |
6802e340 SW |
974 | if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { |
975 | if (test_bit(GLF_LOCK, &gl->gl_flags)) | |
e5dc76b9 | 976 | try_futile = !may_grant(gl, gh); |
6802e340 SW |
977 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags)) |
978 | goto fail; | |
979 | } | |
980 | ||
981 | list_for_each_entry(gh2, &gl->gl_holders, gh_list) { | |
982 | if (unlikely(gh2->gh_owner_pid == gh->gh_owner_pid && | |
983 | (gh->gh_gl->gl_ops->go_type != LM_TYPE_FLOCK))) | |
984 | goto trap_recursive; | |
e5dc76b9 BP |
985 | if (try_futile && |
986 | !(gh2->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) { | |
6802e340 SW |
987 | fail: |
988 | gh->gh_error = GLR_TRYFAILED; | |
989 | gfs2_holder_wake(gh); | |
990 | return; | |
b4c20166 | 991 | } |
6802e340 SW |
992 | if (test_bit(HIF_HOLDER, &gh2->gh_iflags)) |
993 | continue; | |
994 | if (unlikely((gh->gh_flags & LM_FLAG_PRIORITY) && !insert_pt)) | |
995 | insert_pt = &gh2->gh_list; | |
996 | } | |
7b5e3d5f | 997 | set_bit(GLF_QUEUED, &gl->gl_flags); |
edae38a6 | 998 | trace_gfs2_glock_queue(gh, 1); |
a245769f SW |
999 | gfs2_glstats_inc(gl, GFS2_LKS_QCOUNT); |
1000 | gfs2_sbstats_inc(gl, GFS2_LKS_QCOUNT); | |
6802e340 SW |
1001 | if (likely(insert_pt == NULL)) { |
1002 | list_add_tail(&gh->gh_list, &gl->gl_holders); | |
1003 | if (unlikely(gh->gh_flags & LM_FLAG_PRIORITY)) | |
1004 | goto do_cancel; | |
1005 | return; | |
1006 | } | |
1007 | list_add_tail(&gh->gh_list, insert_pt); | |
1008 | do_cancel: | |
1009 | gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list); | |
1010 | if (!(gh->gh_flags & LM_FLAG_PRIORITY)) { | |
1011 | spin_unlock(&gl->gl_spin); | |
048bca22 | 1012 | if (sdp->sd_lockstruct.ls_ops->lm_cancel) |
f057f6cd | 1013 | sdp->sd_lockstruct.ls_ops->lm_cancel(gl); |
6802e340 | 1014 | spin_lock(&gl->gl_spin); |
b3b94faa | 1015 | } |
6802e340 | 1016 | return; |
b3b94faa | 1017 | |
6802e340 SW |
1018 | trap_recursive: |
1019 | print_symbol(KERN_ERR "original: %s\n", gh2->gh_ip); | |
1020 | printk(KERN_ERR "pid: %d\n", pid_nr(gh2->gh_owner_pid)); | |
1021 | printk(KERN_ERR "lock type: %d req lock state : %d\n", | |
1022 | gh2->gh_gl->gl_name.ln_type, gh2->gh_state); | |
1023 | print_symbol(KERN_ERR "new: %s\n", gh->gh_ip); | |
1024 | printk(KERN_ERR "pid: %d\n", pid_nr(gh->gh_owner_pid)); | |
1025 | printk(KERN_ERR "lock type: %d req lock state : %d\n", | |
1026 | gh->gh_gl->gl_name.ln_type, gh->gh_state); | |
8eae1ca0 | 1027 | gfs2_dump_glock(NULL, gl); |
6802e340 | 1028 | BUG(); |
b3b94faa DT |
1029 | } |
1030 | ||
1031 | /** | |
1032 | * gfs2_glock_nq - enqueue a struct gfs2_holder onto a glock (acquire a glock) | |
1033 | * @gh: the holder structure | |
1034 | * | |
1035 | * if (gh->gh_flags & GL_ASYNC), this never returns an error | |
1036 | * | |
1037 | * Returns: 0, GLR_TRYFAILED, or errno on failure | |
1038 | */ | |
1039 | ||
1040 | int gfs2_glock_nq(struct gfs2_holder *gh) | |
1041 | { | |
1042 | struct gfs2_glock *gl = gh->gh_gl; | |
1043 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1044 | int error = 0; | |
1045 | ||
6802e340 | 1046 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
b3b94faa | 1047 | return -EIO; |
b3b94faa | 1048 | |
f42ab085 SW |
1049 | if (test_bit(GLF_LRU, &gl->gl_flags)) |
1050 | gfs2_glock_remove_from_lru(gl); | |
1051 | ||
b3b94faa DT |
1052 | spin_lock(&gl->gl_spin); |
1053 | add_to_queue(gh); | |
0809f6ec SW |
1054 | if ((LM_FLAG_NOEXP & gh->gh_flags) && |
1055 | test_and_clear_bit(GLF_FROZEN, &gl->gl_flags)) | |
1056 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); | |
6802e340 | 1057 | run_queue(gl, 1); |
b3b94faa DT |
1058 | spin_unlock(&gl->gl_spin); |
1059 | ||
6802e340 SW |
1060 | if (!(gh->gh_flags & GL_ASYNC)) |
1061 | error = gfs2_glock_wait(gh); | |
b3b94faa | 1062 | |
b3b94faa DT |
1063 | return error; |
1064 | } | |
1065 | ||
1066 | /** | |
1067 | * gfs2_glock_poll - poll to see if an async request has been completed | |
1068 | * @gh: the holder | |
1069 | * | |
1070 | * Returns: 1 if the request is ready to be gfs2_glock_wait()ed on | |
1071 | */ | |
1072 | ||
1073 | int gfs2_glock_poll(struct gfs2_holder *gh) | |
1074 | { | |
6802e340 | 1075 | return test_bit(HIF_WAIT, &gh->gh_iflags) ? 0 : 1; |
b3b94faa DT |
1076 | } |
1077 | ||
1078 | /** | |
1079 | * gfs2_glock_dq - dequeue a struct gfs2_holder from a glock (release a glock) | |
1080 | * @gh: the glock holder | |
1081 | * | |
1082 | */ | |
1083 | ||
1084 | void gfs2_glock_dq(struct gfs2_holder *gh) | |
1085 | { | |
1086 | struct gfs2_glock *gl = gh->gh_gl; | |
8fb4b536 | 1087 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
c4f68a13 | 1088 | unsigned delay = 0; |
6802e340 | 1089 | int fast_path = 0; |
b3b94faa | 1090 | |
6802e340 | 1091 | spin_lock(&gl->gl_spin); |
b3b94faa | 1092 | if (gh->gh_flags & GL_NOCACHE) |
97cc1025 | 1093 | handle_callback(gl, LM_ST_UNLOCKED, 0); |
b3b94faa | 1094 | |
b3b94faa | 1095 | list_del_init(&gh->gh_list); |
6802e340 | 1096 | if (find_first_holder(gl) == NULL) { |
3042a2cc | 1097 | if (glops->go_unlock) { |
6802e340 | 1098 | GLOCK_BUG_ON(gl, test_and_set_bit(GLF_LOCK, &gl->gl_flags)); |
3042a2cc | 1099 | spin_unlock(&gl->gl_spin); |
b3b94faa | 1100 | glops->go_unlock(gh); |
3042a2cc | 1101 | spin_lock(&gl->gl_spin); |
6802e340 | 1102 | clear_bit(GLF_LOCK, &gl->gl_flags); |
3042a2cc | 1103 | } |
6802e340 SW |
1104 | if (list_empty(&gl->gl_holders) && |
1105 | !test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && | |
1106 | !test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
1107 | fast_path = 1; | |
b3b94faa | 1108 | } |
4abb6ad9 BP |
1109 | if (!test_bit(GLF_LFLUSH, &gl->gl_flags) && demote_ok(gl)) |
1110 | gfs2_glock_add_to_lru(gl); | |
1111 | ||
63997775 | 1112 | trace_gfs2_glock_queue(gh, 0); |
b3b94faa | 1113 | spin_unlock(&gl->gl_spin); |
6802e340 SW |
1114 | if (likely(fast_path)) |
1115 | return; | |
c4f68a13 BM |
1116 | |
1117 | gfs2_glock_hold(gl); | |
1118 | if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && | |
7cf8dcd3 BP |
1119 | !test_bit(GLF_DEMOTE, &gl->gl_flags) && |
1120 | gl->gl_name.ln_type == LM_TYPE_INODE) | |
1121 | delay = gl->gl_hold_time; | |
c4f68a13 BM |
1122 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0) |
1123 | gfs2_glock_put(gl); | |
b3b94faa DT |
1124 | } |
1125 | ||
d93cfa98 AD |
1126 | void gfs2_glock_dq_wait(struct gfs2_holder *gh) |
1127 | { | |
1128 | struct gfs2_glock *gl = gh->gh_gl; | |
1129 | gfs2_glock_dq(gh); | |
81e1d450 BP |
1130 | might_sleep(); |
1131 | wait_on_bit(&gl->gl_flags, GLF_DEMOTE, gfs2_glock_demote_wait, TASK_UNINTERRUPTIBLE); | |
d93cfa98 AD |
1132 | } |
1133 | ||
b3b94faa DT |
1134 | /** |
1135 | * gfs2_glock_dq_uninit - dequeue a holder from a glock and initialize it | |
1136 | * @gh: the holder structure | |
1137 | * | |
1138 | */ | |
1139 | ||
1140 | void gfs2_glock_dq_uninit(struct gfs2_holder *gh) | |
1141 | { | |
1142 | gfs2_glock_dq(gh); | |
1143 | gfs2_holder_uninit(gh); | |
1144 | } | |
1145 | ||
1146 | /** | |
1147 | * gfs2_glock_nq_num - acquire a glock based on lock number | |
1148 | * @sdp: the filesystem | |
1149 | * @number: the lock number | |
1150 | * @glops: the glock operations for the type of glock | |
1151 | * @state: the state to acquire the glock in | |
25985edc | 1152 | * @flags: modifier flags for the acquisition |
b3b94faa DT |
1153 | * @gh: the struct gfs2_holder |
1154 | * | |
1155 | * Returns: errno | |
1156 | */ | |
1157 | ||
cd915493 | 1158 | int gfs2_glock_nq_num(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 SW |
1159 | const struct gfs2_glock_operations *glops, |
1160 | unsigned int state, int flags, struct gfs2_holder *gh) | |
b3b94faa DT |
1161 | { |
1162 | struct gfs2_glock *gl; | |
1163 | int error; | |
1164 | ||
1165 | error = gfs2_glock_get(sdp, number, glops, CREATE, &gl); | |
1166 | if (!error) { | |
1167 | error = gfs2_glock_nq_init(gl, state, flags, gh); | |
1168 | gfs2_glock_put(gl); | |
1169 | } | |
1170 | ||
1171 | return error; | |
1172 | } | |
1173 | ||
1174 | /** | |
1175 | * glock_compare - Compare two struct gfs2_glock structures for sorting | |
1176 | * @arg_a: the first structure | |
1177 | * @arg_b: the second structure | |
1178 | * | |
1179 | */ | |
1180 | ||
1181 | static int glock_compare(const void *arg_a, const void *arg_b) | |
1182 | { | |
a5e08a9e SW |
1183 | const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a; |
1184 | const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b; | |
1185 | const struct lm_lockname *a = &gh_a->gh_gl->gl_name; | |
1186 | const struct lm_lockname *b = &gh_b->gh_gl->gl_name; | |
b3b94faa DT |
1187 | |
1188 | if (a->ln_number > b->ln_number) | |
a5e08a9e SW |
1189 | return 1; |
1190 | if (a->ln_number < b->ln_number) | |
1191 | return -1; | |
1c0f4872 | 1192 | BUG_ON(gh_a->gh_gl->gl_ops->go_type == gh_b->gh_gl->gl_ops->go_type); |
a5e08a9e | 1193 | return 0; |
b3b94faa DT |
1194 | } |
1195 | ||
1196 | /** | |
1197 | * nq_m_sync - synchonously acquire more than one glock in deadlock free order | |
1198 | * @num_gh: the number of structures | |
1199 | * @ghs: an array of struct gfs2_holder structures | |
1200 | * | |
1201 | * Returns: 0 on success (all glocks acquired), | |
1202 | * errno on failure (no glocks acquired) | |
1203 | */ | |
1204 | ||
1205 | static int nq_m_sync(unsigned int num_gh, struct gfs2_holder *ghs, | |
1206 | struct gfs2_holder **p) | |
1207 | { | |
1208 | unsigned int x; | |
1209 | int error = 0; | |
1210 | ||
1211 | for (x = 0; x < num_gh; x++) | |
1212 | p[x] = &ghs[x]; | |
1213 | ||
1214 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare, NULL); | |
1215 | ||
1216 | for (x = 0; x < num_gh; x++) { | |
1217 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1218 | ||
1219 | error = gfs2_glock_nq(p[x]); | |
1220 | if (error) { | |
1221 | while (x--) | |
1222 | gfs2_glock_dq(p[x]); | |
1223 | break; | |
1224 | } | |
1225 | } | |
1226 | ||
1227 | return error; | |
1228 | } | |
1229 | ||
1230 | /** | |
1231 | * gfs2_glock_nq_m - acquire multiple glocks | |
1232 | * @num_gh: the number of structures | |
1233 | * @ghs: an array of struct gfs2_holder structures | |
1234 | * | |
b3b94faa DT |
1235 | * |
1236 | * Returns: 0 on success (all glocks acquired), | |
1237 | * errno on failure (no glocks acquired) | |
1238 | */ | |
1239 | ||
1240 | int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1241 | { | |
eaf5bd3c SW |
1242 | struct gfs2_holder *tmp[4]; |
1243 | struct gfs2_holder **pph = tmp; | |
b3b94faa DT |
1244 | int error = 0; |
1245 | ||
eaf5bd3c SW |
1246 | switch(num_gh) { |
1247 | case 0: | |
b3b94faa | 1248 | return 0; |
eaf5bd3c | 1249 | case 1: |
b3b94faa DT |
1250 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); |
1251 | return gfs2_glock_nq(ghs); | |
eaf5bd3c SW |
1252 | default: |
1253 | if (num_gh <= 4) | |
b3b94faa | 1254 | break; |
eaf5bd3c SW |
1255 | pph = kmalloc(num_gh * sizeof(struct gfs2_holder *), GFP_NOFS); |
1256 | if (!pph) | |
1257 | return -ENOMEM; | |
b3b94faa DT |
1258 | } |
1259 | ||
eaf5bd3c | 1260 | error = nq_m_sync(num_gh, ghs, pph); |
b3b94faa | 1261 | |
eaf5bd3c SW |
1262 | if (pph != tmp) |
1263 | kfree(pph); | |
b3b94faa DT |
1264 | |
1265 | return error; | |
1266 | } | |
1267 | ||
1268 | /** | |
1269 | * gfs2_glock_dq_m - release multiple glocks | |
1270 | * @num_gh: the number of structures | |
1271 | * @ghs: an array of struct gfs2_holder structures | |
1272 | * | |
1273 | */ | |
1274 | ||
1275 | void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1276 | { | |
fa1bbdea BP |
1277 | while (num_gh--) |
1278 | gfs2_glock_dq(&ghs[num_gh]); | |
b3b94faa DT |
1279 | } |
1280 | ||
1281 | /** | |
1282 | * gfs2_glock_dq_uninit_m - release multiple glocks | |
1283 | * @num_gh: the number of structures | |
1284 | * @ghs: an array of struct gfs2_holder structures | |
1285 | * | |
1286 | */ | |
1287 | ||
1288 | void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1289 | { | |
fa1bbdea BP |
1290 | while (num_gh--) |
1291 | gfs2_glock_dq_uninit(&ghs[num_gh]); | |
b3b94faa DT |
1292 | } |
1293 | ||
f057f6cd | 1294 | void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state) |
da755fdb | 1295 | { |
c4f68a13 BM |
1296 | unsigned long delay = 0; |
1297 | unsigned long holdtime; | |
1298 | unsigned long now = jiffies; | |
b3b94faa | 1299 | |
f057f6cd | 1300 | gfs2_glock_hold(gl); |
7cf8dcd3 BP |
1301 | holdtime = gl->gl_tchange + gl->gl_hold_time; |
1302 | if (test_bit(GLF_QUEUED, &gl->gl_flags) && | |
1303 | gl->gl_name.ln_type == LM_TYPE_INODE) { | |
7b5e3d5f SW |
1304 | if (time_before(now, holdtime)) |
1305 | delay = holdtime - now; | |
1306 | if (test_bit(GLF_REPLY_PENDING, &gl->gl_flags)) | |
7cf8dcd3 | 1307 | delay = gl->gl_hold_time; |
7b5e3d5f | 1308 | } |
b3b94faa | 1309 | |
6802e340 | 1310 | spin_lock(&gl->gl_spin); |
97cc1025 | 1311 | handle_callback(gl, state, delay); |
6802e340 | 1312 | spin_unlock(&gl->gl_spin); |
c4f68a13 BM |
1313 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0) |
1314 | gfs2_glock_put(gl); | |
b3b94faa DT |
1315 | } |
1316 | ||
0809f6ec SW |
1317 | /** |
1318 | * gfs2_should_freeze - Figure out if glock should be frozen | |
1319 | * @gl: The glock in question | |
1320 | * | |
1321 | * Glocks are not frozen if (a) the result of the dlm operation is | |
1322 | * an error, (b) the locking operation was an unlock operation or | |
1323 | * (c) if there is a "noexp" flagged request anywhere in the queue | |
1324 | * | |
1325 | * Returns: 1 if freezing should occur, 0 otherwise | |
1326 | */ | |
1327 | ||
1328 | static int gfs2_should_freeze(const struct gfs2_glock *gl) | |
1329 | { | |
1330 | const struct gfs2_holder *gh; | |
1331 | ||
1332 | if (gl->gl_reply & ~LM_OUT_ST_MASK) | |
1333 | return 0; | |
1334 | if (gl->gl_target == LM_ST_UNLOCKED) | |
1335 | return 0; | |
1336 | ||
1337 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
1338 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
1339 | continue; | |
1340 | if (LM_FLAG_NOEXP & gh->gh_flags) | |
1341 | return 0; | |
1342 | } | |
1343 | ||
1344 | return 1; | |
1345 | } | |
1346 | ||
b3b94faa | 1347 | /** |
f057f6cd SW |
1348 | * gfs2_glock_complete - Callback used by locking |
1349 | * @gl: Pointer to the glock | |
1350 | * @ret: The return value from the dlm | |
b3b94faa | 1351 | * |
47a25380 SW |
1352 | * The gl_reply field is under the gl_spin lock so that it is ok |
1353 | * to use a bitfield shared with other glock state fields. | |
b3b94faa DT |
1354 | */ |
1355 | ||
f057f6cd | 1356 | void gfs2_glock_complete(struct gfs2_glock *gl, int ret) |
b3b94faa | 1357 | { |
f057f6cd | 1358 | struct lm_lockstruct *ls = &gl->gl_sbd->sd_lockstruct; |
0809f6ec | 1359 | |
47a25380 | 1360 | spin_lock(&gl->gl_spin); |
f057f6cd | 1361 | gl->gl_reply = ret; |
0809f6ec | 1362 | |
e0c2a9aa | 1363 | if (unlikely(test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))) { |
0809f6ec | 1364 | if (gfs2_should_freeze(gl)) { |
f057f6cd | 1365 | set_bit(GLF_FROZEN, &gl->gl_flags); |
0809f6ec | 1366 | spin_unlock(&gl->gl_spin); |
b3b94faa | 1367 | return; |
0809f6ec | 1368 | } |
b3b94faa | 1369 | } |
47a25380 SW |
1370 | |
1371 | spin_unlock(&gl->gl_spin); | |
f057f6cd | 1372 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
47a25380 | 1373 | smp_wmb(); |
f057f6cd SW |
1374 | gfs2_glock_hold(gl); |
1375 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) | |
1376 | gfs2_glock_put(gl); | |
b3b94faa DT |
1377 | } |
1378 | ||
b3b94faa | 1379 | |
1495f230 YH |
1380 | static int gfs2_shrink_glock_memory(struct shrinker *shrink, |
1381 | struct shrink_control *sc) | |
b3b94faa DT |
1382 | { |
1383 | struct gfs2_glock *gl; | |
97cc1025 SW |
1384 | int may_demote; |
1385 | int nr_skipped = 0; | |
1495f230 YH |
1386 | int nr = sc->nr_to_scan; |
1387 | gfp_t gfp_mask = sc->gfp_mask; | |
97cc1025 | 1388 | LIST_HEAD(skipped); |
b3b94faa | 1389 | |
97cc1025 SW |
1390 | if (nr == 0) |
1391 | goto out; | |
b3b94faa | 1392 | |
97cc1025 SW |
1393 | if (!(gfp_mask & __GFP_FS)) |
1394 | return -1; | |
b3b94faa | 1395 | |
97cc1025 SW |
1396 | spin_lock(&lru_lock); |
1397 | while(nr && !list_empty(&lru_list)) { | |
1398 | gl = list_entry(lru_list.next, struct gfs2_glock, gl_lru); | |
1399 | list_del_init(&gl->gl_lru); | |
627c10b7 | 1400 | clear_bit(GLF_LRU, &gl->gl_flags); |
97cc1025 SW |
1401 | atomic_dec(&lru_count); |
1402 | ||
1403 | /* Test for being demotable */ | |
1404 | if (!test_and_set_bit(GLF_LOCK, &gl->gl_flags)) { | |
1405 | gfs2_glock_hold(gl); | |
97cc1025 SW |
1406 | spin_unlock(&lru_lock); |
1407 | spin_lock(&gl->gl_spin); | |
1408 | may_demote = demote_ok(gl); | |
97cc1025 SW |
1409 | if (may_demote) { |
1410 | handle_callback(gl, LM_ST_UNLOCKED, 0); | |
1411 | nr--; | |
97cc1025 | 1412 | } |
7e71c55e SW |
1413 | clear_bit(GLF_LOCK, &gl->gl_flags); |
1414 | smp_mb__after_clear_bit(); | |
2163b1e6 | 1415 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
b94a170e BM |
1416 | gfs2_glock_put_nolock(gl); |
1417 | spin_unlock(&gl->gl_spin); | |
97cc1025 | 1418 | spin_lock(&lru_lock); |
2163b1e6 | 1419 | continue; |
97cc1025 | 1420 | } |
2163b1e6 SW |
1421 | nr_skipped++; |
1422 | list_add(&gl->gl_lru, &skipped); | |
627c10b7 | 1423 | set_bit(GLF_LRU, &gl->gl_flags); |
b3b94faa | 1424 | } |
97cc1025 SW |
1425 | list_splice(&skipped, &lru_list); |
1426 | atomic_add(nr_skipped, &lru_count); | |
1427 | spin_unlock(&lru_lock); | |
1428 | out: | |
1429 | return (atomic_read(&lru_count) / 100) * sysctl_vfs_cache_pressure; | |
b3b94faa DT |
1430 | } |
1431 | ||
97cc1025 SW |
1432 | static struct shrinker glock_shrinker = { |
1433 | .shrink = gfs2_shrink_glock_memory, | |
1434 | .seeks = DEFAULT_SEEKS, | |
1435 | }; | |
1436 | ||
b3b94faa DT |
1437 | /** |
1438 | * examine_bucket - Call a function for glock in a hash bucket | |
1439 | * @examiner: the function | |
1440 | * @sdp: the filesystem | |
1441 | * @bucket: the bucket | |
1442 | * | |
b3b94faa DT |
1443 | */ |
1444 | ||
bc015cb8 | 1445 | static void examine_bucket(glock_examiner examiner, const struct gfs2_sbd *sdp, |
37b2fa6a | 1446 | unsigned int hash) |
b3b94faa | 1447 | { |
bc015cb8 SW |
1448 | struct gfs2_glock *gl; |
1449 | struct hlist_bl_head *head = &gl_hash_table[hash]; | |
1450 | struct hlist_bl_node *pos; | |
b3b94faa | 1451 | |
bc015cb8 SW |
1452 | rcu_read_lock(); |
1453 | hlist_bl_for_each_entry_rcu(gl, pos, head, gl_list) { | |
1454 | if ((gl->gl_sbd == sdp) && atomic_read(&gl->gl_ref)) | |
24264434 | 1455 | examiner(gl); |
b3b94faa | 1456 | } |
bc015cb8 | 1457 | rcu_read_unlock(); |
8fbbfd21 | 1458 | cond_resched(); |
bc015cb8 SW |
1459 | } |
1460 | ||
1461 | static void glock_hash_walk(glock_examiner examiner, const struct gfs2_sbd *sdp) | |
1462 | { | |
1463 | unsigned x; | |
1464 | ||
1465 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) | |
1466 | examine_bucket(examiner, sdp, x); | |
b3b94faa DT |
1467 | } |
1468 | ||
f057f6cd SW |
1469 | |
1470 | /** | |
1471 | * thaw_glock - thaw out a glock which has an unprocessed reply waiting | |
1472 | * @gl: The glock to thaw | |
1473 | * | |
1474 | * N.B. When we freeze a glock, we leave a ref to the glock outstanding, | |
1475 | * so this has to result in the ref count being dropped by one. | |
1476 | */ | |
1477 | ||
1478 | static void thaw_glock(struct gfs2_glock *gl) | |
1479 | { | |
1480 | if (!test_and_clear_bit(GLF_FROZEN, &gl->gl_flags)) | |
1481 | return; | |
f057f6cd SW |
1482 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
1483 | gfs2_glock_hold(gl); | |
1484 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) | |
1485 | gfs2_glock_put(gl); | |
f057f6cd SW |
1486 | } |
1487 | ||
b3b94faa DT |
1488 | /** |
1489 | * clear_glock - look at a glock and see if we can free it from glock cache | |
1490 | * @gl: the glock to look at | |
1491 | * | |
1492 | */ | |
1493 | ||
1494 | static void clear_glock(struct gfs2_glock *gl) | |
1495 | { | |
f42ab085 | 1496 | gfs2_glock_remove_from_lru(gl); |
b3b94faa | 1497 | |
6802e340 | 1498 | spin_lock(&gl->gl_spin); |
c741c455 | 1499 | if (gl->gl_state != LM_ST_UNLOCKED) |
97cc1025 | 1500 | handle_callback(gl, LM_ST_UNLOCKED, 0); |
6802e340 SW |
1501 | spin_unlock(&gl->gl_spin); |
1502 | gfs2_glock_hold(gl); | |
1503 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) | |
1504 | gfs2_glock_put(gl); | |
b3b94faa DT |
1505 | } |
1506 | ||
f057f6cd SW |
1507 | /** |
1508 | * gfs2_glock_thaw - Thaw any frozen glocks | |
1509 | * @sdp: The super block | |
1510 | * | |
1511 | */ | |
1512 | ||
1513 | void gfs2_glock_thaw(struct gfs2_sbd *sdp) | |
1514 | { | |
bc015cb8 SW |
1515 | glock_hash_walk(thaw_glock, sdp); |
1516 | } | |
f057f6cd | 1517 | |
bc015cb8 SW |
1518 | static int dump_glock(struct seq_file *seq, struct gfs2_glock *gl) |
1519 | { | |
1520 | int ret; | |
1521 | spin_lock(&gl->gl_spin); | |
8eae1ca0 | 1522 | ret = gfs2_dump_glock(seq, gl); |
bc015cb8 SW |
1523 | spin_unlock(&gl->gl_spin); |
1524 | return ret; | |
1525 | } | |
1526 | ||
1527 | static void dump_glock_func(struct gfs2_glock *gl) | |
1528 | { | |
1529 | dump_glock(NULL, gl); | |
f057f6cd SW |
1530 | } |
1531 | ||
b3b94faa DT |
1532 | /** |
1533 | * gfs2_gl_hash_clear - Empty out the glock hash table | |
1534 | * @sdp: the filesystem | |
1535 | * @wait: wait until it's all gone | |
1536 | * | |
1bdad606 | 1537 | * Called when unmounting the filesystem. |
b3b94faa DT |
1538 | */ |
1539 | ||
fefc03bf | 1540 | void gfs2_gl_hash_clear(struct gfs2_sbd *sdp) |
b3b94faa | 1541 | { |
fb6791d1 | 1542 | set_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags); |
bc015cb8 | 1543 | glock_hash_walk(clear_glock, sdp); |
8f05228e SW |
1544 | flush_workqueue(glock_workqueue); |
1545 | wait_event(sdp->sd_glock_wait, atomic_read(&sdp->sd_glock_disposal) == 0); | |
bc015cb8 | 1546 | glock_hash_walk(dump_glock_func, sdp); |
b3b94faa DT |
1547 | } |
1548 | ||
813e0c46 SW |
1549 | void gfs2_glock_finish_truncate(struct gfs2_inode *ip) |
1550 | { | |
1551 | struct gfs2_glock *gl = ip->i_gl; | |
1552 | int ret; | |
1553 | ||
1554 | ret = gfs2_truncatei_resume(ip); | |
1555 | gfs2_assert_withdraw(gl->gl_sbd, ret == 0); | |
1556 | ||
1557 | spin_lock(&gl->gl_spin); | |
1558 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
1559 | run_queue(gl, 1); | |
1560 | spin_unlock(&gl->gl_spin); | |
1561 | } | |
1562 | ||
6802e340 | 1563 | static const char *state2str(unsigned state) |
04b933f2 | 1564 | { |
6802e340 SW |
1565 | switch(state) { |
1566 | case LM_ST_UNLOCKED: | |
1567 | return "UN"; | |
1568 | case LM_ST_SHARED: | |
1569 | return "SH"; | |
1570 | case LM_ST_DEFERRED: | |
1571 | return "DF"; | |
1572 | case LM_ST_EXCLUSIVE: | |
1573 | return "EX"; | |
1574 | } | |
1575 | return "??"; | |
1576 | } | |
1577 | ||
1578 | static const char *hflags2str(char *buf, unsigned flags, unsigned long iflags) | |
1579 | { | |
1580 | char *p = buf; | |
1581 | if (flags & LM_FLAG_TRY) | |
1582 | *p++ = 't'; | |
1583 | if (flags & LM_FLAG_TRY_1CB) | |
1584 | *p++ = 'T'; | |
1585 | if (flags & LM_FLAG_NOEXP) | |
1586 | *p++ = 'e'; | |
1587 | if (flags & LM_FLAG_ANY) | |
f057f6cd | 1588 | *p++ = 'A'; |
6802e340 SW |
1589 | if (flags & LM_FLAG_PRIORITY) |
1590 | *p++ = 'p'; | |
1591 | if (flags & GL_ASYNC) | |
1592 | *p++ = 'a'; | |
1593 | if (flags & GL_EXACT) | |
1594 | *p++ = 'E'; | |
6802e340 SW |
1595 | if (flags & GL_NOCACHE) |
1596 | *p++ = 'c'; | |
1597 | if (test_bit(HIF_HOLDER, &iflags)) | |
1598 | *p++ = 'H'; | |
1599 | if (test_bit(HIF_WAIT, &iflags)) | |
1600 | *p++ = 'W'; | |
1601 | if (test_bit(HIF_FIRST, &iflags)) | |
1602 | *p++ = 'F'; | |
1603 | *p = 0; | |
1604 | return buf; | |
04b933f2 RP |
1605 | } |
1606 | ||
b3b94faa DT |
1607 | /** |
1608 | * dump_holder - print information about a glock holder | |
6802e340 | 1609 | * @seq: the seq_file struct |
b3b94faa DT |
1610 | * @gh: the glock holder |
1611 | * | |
1612 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
1613 | */ | |
1614 | ||
6802e340 | 1615 | static int dump_holder(struct seq_file *seq, const struct gfs2_holder *gh) |
b3b94faa | 1616 | { |
6802e340 | 1617 | struct task_struct *gh_owner = NULL; |
6802e340 | 1618 | char flags_buf[32]; |
b3b94faa | 1619 | |
6802e340 | 1620 | if (gh->gh_owner_pid) |
b1e058da | 1621 | gh_owner = pid_task(gh->gh_owner_pid, PIDTYPE_PID); |
cc18152e JP |
1622 | gfs2_print_dbg(seq, " H: s:%s f:%s e:%d p:%ld [%s] %pS\n", |
1623 | state2str(gh->gh_state), | |
1624 | hflags2str(flags_buf, gh->gh_flags, gh->gh_iflags), | |
1625 | gh->gh_error, | |
1626 | gh->gh_owner_pid ? (long)pid_nr(gh->gh_owner_pid) : -1, | |
1627 | gh_owner ? gh_owner->comm : "(ended)", | |
1628 | (void *)gh->gh_ip); | |
7c52b166 | 1629 | return 0; |
b3b94faa DT |
1630 | } |
1631 | ||
627c10b7 | 1632 | static const char *gflags2str(char *buf, const struct gfs2_glock *gl) |
6802e340 | 1633 | { |
627c10b7 | 1634 | const unsigned long *gflags = &gl->gl_flags; |
6802e340 | 1635 | char *p = buf; |
627c10b7 | 1636 | |
6802e340 SW |
1637 | if (test_bit(GLF_LOCK, gflags)) |
1638 | *p++ = 'l'; | |
6802e340 SW |
1639 | if (test_bit(GLF_DEMOTE, gflags)) |
1640 | *p++ = 'D'; | |
1641 | if (test_bit(GLF_PENDING_DEMOTE, gflags)) | |
1642 | *p++ = 'd'; | |
1643 | if (test_bit(GLF_DEMOTE_IN_PROGRESS, gflags)) | |
1644 | *p++ = 'p'; | |
1645 | if (test_bit(GLF_DIRTY, gflags)) | |
1646 | *p++ = 'y'; | |
1647 | if (test_bit(GLF_LFLUSH, gflags)) | |
1648 | *p++ = 'f'; | |
1649 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, gflags)) | |
1650 | *p++ = 'i'; | |
1651 | if (test_bit(GLF_REPLY_PENDING, gflags)) | |
1652 | *p++ = 'r'; | |
f057f6cd | 1653 | if (test_bit(GLF_INITIAL, gflags)) |
d8348de0 | 1654 | *p++ = 'I'; |
f057f6cd SW |
1655 | if (test_bit(GLF_FROZEN, gflags)) |
1656 | *p++ = 'F'; | |
7b5e3d5f SW |
1657 | if (test_bit(GLF_QUEUED, gflags)) |
1658 | *p++ = 'q'; | |
627c10b7 SW |
1659 | if (test_bit(GLF_LRU, gflags)) |
1660 | *p++ = 'L'; | |
1661 | if (gl->gl_object) | |
1662 | *p++ = 'o'; | |
a245769f SW |
1663 | if (test_bit(GLF_BLOCKING, gflags)) |
1664 | *p++ = 'b'; | |
6802e340 SW |
1665 | *p = 0; |
1666 | return buf; | |
b3b94faa DT |
1667 | } |
1668 | ||
1669 | /** | |
8eae1ca0 | 1670 | * gfs2_dump_glock - print information about a glock |
6802e340 | 1671 | * @seq: The seq_file struct |
b3b94faa | 1672 | * @gl: the glock |
6802e340 SW |
1673 | * |
1674 | * The file format is as follows: | |
1675 | * One line per object, capital letters are used to indicate objects | |
1676 | * G = glock, I = Inode, R = rgrp, H = holder. Glocks are not indented, | |
1677 | * other objects are indented by a single space and follow the glock to | |
1678 | * which they are related. Fields are indicated by lower case letters | |
1679 | * followed by a colon and the field value, except for strings which are in | |
1680 | * [] so that its possible to see if they are composed of spaces for | |
1681 | * example. The field's are n = number (id of the object), f = flags, | |
1682 | * t = type, s = state, r = refcount, e = error, p = pid. | |
b3b94faa DT |
1683 | * |
1684 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
1685 | */ | |
1686 | ||
8eae1ca0 | 1687 | int gfs2_dump_glock(struct seq_file *seq, const struct gfs2_glock *gl) |
b3b94faa | 1688 | { |
6802e340 SW |
1689 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
1690 | unsigned long long dtime; | |
1691 | const struct gfs2_holder *gh; | |
1692 | char gflags_buf[32]; | |
1693 | int error = 0; | |
b3b94faa | 1694 | |
6802e340 SW |
1695 | dtime = jiffies - gl->gl_demote_time; |
1696 | dtime *= 1000000/HZ; /* demote time in uSec */ | |
1697 | if (!test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
1698 | dtime = 0; | |
7cf8dcd3 | 1699 | gfs2_print_dbg(seq, "G: s:%s n:%u/%llx f:%s t:%s d:%s/%llu a:%d v:%d r:%d m:%ld\n", |
6802e340 SW |
1700 | state2str(gl->gl_state), |
1701 | gl->gl_name.ln_type, | |
1702 | (unsigned long long)gl->gl_name.ln_number, | |
627c10b7 | 1703 | gflags2str(gflags_buf, gl), |
6802e340 SW |
1704 | state2str(gl->gl_target), |
1705 | state2str(gl->gl_demote_state), dtime, | |
6802e340 | 1706 | atomic_read(&gl->gl_ail_count), |
f42ab085 | 1707 | atomic_read(&gl->gl_revokes), |
7cf8dcd3 | 1708 | atomic_read(&gl->gl_ref), gl->gl_hold_time); |
b3b94faa | 1709 | |
b3b94faa | 1710 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { |
6802e340 | 1711 | error = dump_holder(seq, gh); |
b3b94faa DT |
1712 | if (error) |
1713 | goto out; | |
1714 | } | |
6802e340 SW |
1715 | if (gl->gl_state != LM_ST_UNLOCKED && glops->go_dump) |
1716 | error = glops->go_dump(seq, gl); | |
a91ea69f | 1717 | out: |
b3b94faa DT |
1718 | return error; |
1719 | } | |
1720 | ||
a245769f SW |
1721 | static int gfs2_glstats_seq_show(struct seq_file *seq, void *iter_ptr) |
1722 | { | |
1723 | struct gfs2_glock *gl = iter_ptr; | |
1724 | ||
1725 | seq_printf(seq, "G: n:%u/%llx rtt:%lld/%lld rttb:%lld/%lld irt:%lld/%lld dcnt: %lld qcnt: %lld\n", | |
1726 | gl->gl_name.ln_type, | |
1727 | (unsigned long long)gl->gl_name.ln_number, | |
1728 | (long long)gl->gl_stats.stats[GFS2_LKS_SRTT], | |
1729 | (long long)gl->gl_stats.stats[GFS2_LKS_SRTTVAR], | |
1730 | (long long)gl->gl_stats.stats[GFS2_LKS_SRTTB], | |
1731 | (long long)gl->gl_stats.stats[GFS2_LKS_SRTTVARB], | |
1732 | (long long)gl->gl_stats.stats[GFS2_LKS_SIRT], | |
1733 | (long long)gl->gl_stats.stats[GFS2_LKS_SIRTVAR], | |
1734 | (long long)gl->gl_stats.stats[GFS2_LKS_DCOUNT], | |
1735 | (long long)gl->gl_stats.stats[GFS2_LKS_QCOUNT]); | |
1736 | return 0; | |
1737 | } | |
1738 | ||
1739 | static const char *gfs2_gltype[] = { | |
1740 | "type", | |
1741 | "reserved", | |
1742 | "nondisk", | |
1743 | "inode", | |
1744 | "rgrp", | |
1745 | "meta", | |
1746 | "iopen", | |
1747 | "flock", | |
1748 | "plock", | |
1749 | "quota", | |
1750 | "journal", | |
1751 | }; | |
1752 | ||
1753 | static const char *gfs2_stype[] = { | |
1754 | [GFS2_LKS_SRTT] = "srtt", | |
1755 | [GFS2_LKS_SRTTVAR] = "srttvar", | |
1756 | [GFS2_LKS_SRTTB] = "srttb", | |
1757 | [GFS2_LKS_SRTTVARB] = "srttvarb", | |
1758 | [GFS2_LKS_SIRT] = "sirt", | |
1759 | [GFS2_LKS_SIRTVAR] = "sirtvar", | |
1760 | [GFS2_LKS_DCOUNT] = "dlm", | |
1761 | [GFS2_LKS_QCOUNT] = "queue", | |
1762 | }; | |
1763 | ||
1764 | #define GFS2_NR_SBSTATS (ARRAY_SIZE(gfs2_gltype) * ARRAY_SIZE(gfs2_stype)) | |
1765 | ||
1766 | static int gfs2_sbstats_seq_show(struct seq_file *seq, void *iter_ptr) | |
1767 | { | |
1768 | struct gfs2_glock_iter *gi = seq->private; | |
1769 | struct gfs2_sbd *sdp = gi->sdp; | |
1770 | unsigned index = gi->hash >> 3; | |
1771 | unsigned subindex = gi->hash & 0x07; | |
1772 | s64 value; | |
1773 | int i; | |
1774 | ||
1775 | if (index == 0 && subindex != 0) | |
1776 | return 0; | |
6802e340 | 1777 | |
a245769f SW |
1778 | seq_printf(seq, "%-10s %8s:", gfs2_gltype[index], |
1779 | (index == 0) ? "cpu": gfs2_stype[subindex]); | |
b3b94faa | 1780 | |
a245769f SW |
1781 | for_each_possible_cpu(i) { |
1782 | const struct gfs2_pcpu_lkstats *lkstats = per_cpu_ptr(sdp->sd_lkstats, i); | |
1783 | if (index == 0) { | |
1784 | value = i; | |
1785 | } else { | |
1786 | value = lkstats->lkstats[index - 1].stats[subindex]; | |
1787 | } | |
1788 | seq_printf(seq, " %15lld", (long long)value); | |
1789 | } | |
1790 | seq_putc(seq, '\n'); | |
1791 | return 0; | |
1792 | } | |
8fbbfd21 | 1793 | |
85d1da67 SW |
1794 | int __init gfs2_glock_init(void) |
1795 | { | |
1796 | unsigned i; | |
1797 | for(i = 0; i < GFS2_GL_HASH_SIZE; i++) { | |
bc015cb8 | 1798 | INIT_HLIST_BL_HEAD(&gl_hash_table[i]); |
087efdd3 | 1799 | } |
8fbbfd21 | 1800 | |
d2115778 | 1801 | glock_workqueue = alloc_workqueue("glock_workqueue", WQ_MEM_RECLAIM | |
58a69cb4 | 1802 | WQ_HIGHPRI | WQ_FREEZABLE, 0); |
97cc1025 | 1803 | if (IS_ERR(glock_workqueue)) |
c4f68a13 | 1804 | return PTR_ERR(glock_workqueue); |
d2115778 | 1805 | gfs2_delete_workqueue = alloc_workqueue("delete_workqueue", |
58a69cb4 | 1806 | WQ_MEM_RECLAIM | WQ_FREEZABLE, |
d2115778 | 1807 | 0); |
b94a170e BM |
1808 | if (IS_ERR(gfs2_delete_workqueue)) { |
1809 | destroy_workqueue(glock_workqueue); | |
1810 | return PTR_ERR(gfs2_delete_workqueue); | |
1811 | } | |
97cc1025 SW |
1812 | |
1813 | register_shrinker(&glock_shrinker); | |
c4f68a13 | 1814 | |
85d1da67 SW |
1815 | return 0; |
1816 | } | |
1817 | ||
8fbbfd21 SW |
1818 | void gfs2_glock_exit(void) |
1819 | { | |
97cc1025 | 1820 | unregister_shrinker(&glock_shrinker); |
c4f68a13 | 1821 | destroy_workqueue(glock_workqueue); |
b94a170e | 1822 | destroy_workqueue(gfs2_delete_workqueue); |
8fbbfd21 SW |
1823 | } |
1824 | ||
bc015cb8 SW |
1825 | static inline struct gfs2_glock *glock_hash_chain(unsigned hash) |
1826 | { | |
1827 | return hlist_bl_entry(hlist_bl_first_rcu(&gl_hash_table[hash]), | |
1828 | struct gfs2_glock, gl_list); | |
1829 | } | |
1830 | ||
1831 | static inline struct gfs2_glock *glock_hash_next(struct gfs2_glock *gl) | |
1832 | { | |
7e32d026 | 1833 | return hlist_bl_entry(rcu_dereference(gl->gl_list.next), |
bc015cb8 SW |
1834 | struct gfs2_glock, gl_list); |
1835 | } | |
1836 | ||
6802e340 | 1837 | static int gfs2_glock_iter_next(struct gfs2_glock_iter *gi) |
7c52b166 | 1838 | { |
7b08fc62 SW |
1839 | struct gfs2_glock *gl; |
1840 | ||
bc015cb8 SW |
1841 | do { |
1842 | gl = gi->gl; | |
1843 | if (gl) { | |
1844 | gi->gl = glock_hash_next(gl); | |
ba1ddcb6 | 1845 | gi->nhash++; |
bc015cb8 | 1846 | } else { |
ba1ddcb6 SW |
1847 | if (gi->hash >= GFS2_GL_HASH_SIZE) { |
1848 | rcu_read_unlock(); | |
1849 | return 1; | |
1850 | } | |
bc015cb8 | 1851 | gi->gl = glock_hash_chain(gi->hash); |
ba1ddcb6 | 1852 | gi->nhash = 0; |
bc015cb8 SW |
1853 | } |
1854 | while (gi->gl == NULL) { | |
1855 | gi->hash++; | |
1856 | if (gi->hash >= GFS2_GL_HASH_SIZE) { | |
1857 | rcu_read_unlock(); | |
1858 | return 1; | |
1859 | } | |
1860 | gi->gl = glock_hash_chain(gi->hash); | |
ba1ddcb6 | 1861 | gi->nhash = 0; |
bc015cb8 SW |
1862 | } |
1863 | /* Skip entries for other sb and dead entries */ | |
1864 | } while (gi->sdp != gi->gl->gl_sbd || atomic_read(&gi->gl->gl_ref) == 0); | |
a947e033 | 1865 | |
7c52b166 RP |
1866 | return 0; |
1867 | } | |
1868 | ||
6802e340 | 1869 | static void *gfs2_glock_seq_start(struct seq_file *seq, loff_t *pos) |
7c52b166 | 1870 | { |
6802e340 | 1871 | struct gfs2_glock_iter *gi = seq->private; |
7c52b166 RP |
1872 | loff_t n = *pos; |
1873 | ||
ba1ddcb6 SW |
1874 | if (gi->last_pos <= *pos) |
1875 | n = gi->nhash + (*pos - gi->last_pos); | |
1876 | else | |
1877 | gi->hash = 0; | |
1878 | ||
1879 | gi->nhash = 0; | |
bc015cb8 | 1880 | rcu_read_lock(); |
7c52b166 | 1881 | |
6802e340 | 1882 | do { |
bc015cb8 | 1883 | if (gfs2_glock_iter_next(gi)) |
7c52b166 | 1884 | return NULL; |
6802e340 | 1885 | } while (n--); |
7c52b166 | 1886 | |
ba1ddcb6 | 1887 | gi->last_pos = *pos; |
6802e340 | 1888 | return gi->gl; |
7c52b166 RP |
1889 | } |
1890 | ||
6802e340 | 1891 | static void *gfs2_glock_seq_next(struct seq_file *seq, void *iter_ptr, |
7c52b166 RP |
1892 | loff_t *pos) |
1893 | { | |
6802e340 | 1894 | struct gfs2_glock_iter *gi = seq->private; |
7c52b166 RP |
1895 | |
1896 | (*pos)++; | |
ba1ddcb6 | 1897 | gi->last_pos = *pos; |
bc015cb8 | 1898 | if (gfs2_glock_iter_next(gi)) |
7c52b166 | 1899 | return NULL; |
7c52b166 | 1900 | |
6802e340 | 1901 | return gi->gl; |
7c52b166 RP |
1902 | } |
1903 | ||
6802e340 | 1904 | static void gfs2_glock_seq_stop(struct seq_file *seq, void *iter_ptr) |
7c52b166 | 1905 | { |
6802e340 | 1906 | struct gfs2_glock_iter *gi = seq->private; |
bc015cb8 SW |
1907 | |
1908 | if (gi->gl) | |
1909 | rcu_read_unlock(); | |
1910 | gi->gl = NULL; | |
7c52b166 RP |
1911 | } |
1912 | ||
6802e340 | 1913 | static int gfs2_glock_seq_show(struct seq_file *seq, void *iter_ptr) |
7c52b166 | 1914 | { |
6802e340 | 1915 | return dump_glock(seq, iter_ptr); |
7c52b166 RP |
1916 | } |
1917 | ||
a245769f SW |
1918 | static void *gfs2_sbstats_seq_start(struct seq_file *seq, loff_t *pos) |
1919 | { | |
1920 | struct gfs2_glock_iter *gi = seq->private; | |
1921 | ||
1922 | gi->hash = *pos; | |
1923 | if (*pos >= GFS2_NR_SBSTATS) | |
1924 | return NULL; | |
1925 | preempt_disable(); | |
1926 | return SEQ_START_TOKEN; | |
1927 | } | |
1928 | ||
1929 | static void *gfs2_sbstats_seq_next(struct seq_file *seq, void *iter_ptr, | |
1930 | loff_t *pos) | |
1931 | { | |
1932 | struct gfs2_glock_iter *gi = seq->private; | |
1933 | (*pos)++; | |
1934 | gi->hash++; | |
1935 | if (gi->hash >= GFS2_NR_SBSTATS) { | |
1936 | preempt_enable(); | |
1937 | return NULL; | |
1938 | } | |
1939 | return SEQ_START_TOKEN; | |
1940 | } | |
1941 | ||
1942 | static void gfs2_sbstats_seq_stop(struct seq_file *seq, void *iter_ptr) | |
1943 | { | |
1944 | preempt_enable(); | |
1945 | } | |
1946 | ||
4ef29002 | 1947 | static const struct seq_operations gfs2_glock_seq_ops = { |
7c52b166 RP |
1948 | .start = gfs2_glock_seq_start, |
1949 | .next = gfs2_glock_seq_next, | |
1950 | .stop = gfs2_glock_seq_stop, | |
1951 | .show = gfs2_glock_seq_show, | |
1952 | }; | |
1953 | ||
a245769f SW |
1954 | static const struct seq_operations gfs2_glstats_seq_ops = { |
1955 | .start = gfs2_glock_seq_start, | |
1956 | .next = gfs2_glock_seq_next, | |
1957 | .stop = gfs2_glock_seq_stop, | |
1958 | .show = gfs2_glstats_seq_show, | |
1959 | }; | |
1960 | ||
1961 | static const struct seq_operations gfs2_sbstats_seq_ops = { | |
1962 | .start = gfs2_sbstats_seq_start, | |
1963 | .next = gfs2_sbstats_seq_next, | |
1964 | .stop = gfs2_sbstats_seq_stop, | |
1965 | .show = gfs2_sbstats_seq_show, | |
1966 | }; | |
1967 | ||
0fe2f1e9 SW |
1968 | #define GFS2_SEQ_GOODSIZE min(PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER, 65536UL) |
1969 | ||
a245769f | 1970 | static int gfs2_glocks_open(struct inode *inode, struct file *file) |
7c52b166 | 1971 | { |
6802e340 SW |
1972 | int ret = seq_open_private(file, &gfs2_glock_seq_ops, |
1973 | sizeof(struct gfs2_glock_iter)); | |
1974 | if (ret == 0) { | |
1975 | struct seq_file *seq = file->private_data; | |
1976 | struct gfs2_glock_iter *gi = seq->private; | |
1977 | gi->sdp = inode->i_private; | |
0fe2f1e9 | 1978 | seq->buf = kmalloc(GFS2_SEQ_GOODSIZE, GFP_KERNEL | __GFP_NOWARN); |
df5d2f55 | 1979 | if (seq->buf) |
0fe2f1e9 | 1980 | seq->size = GFS2_SEQ_GOODSIZE; |
6802e340 SW |
1981 | } |
1982 | return ret; | |
7c52b166 RP |
1983 | } |
1984 | ||
a245769f SW |
1985 | static int gfs2_glstats_open(struct inode *inode, struct file *file) |
1986 | { | |
1987 | int ret = seq_open_private(file, &gfs2_glstats_seq_ops, | |
1988 | sizeof(struct gfs2_glock_iter)); | |
1989 | if (ret == 0) { | |
1990 | struct seq_file *seq = file->private_data; | |
1991 | struct gfs2_glock_iter *gi = seq->private; | |
1992 | gi->sdp = inode->i_private; | |
0fe2f1e9 | 1993 | seq->buf = kmalloc(GFS2_SEQ_GOODSIZE, GFP_KERNEL | __GFP_NOWARN); |
df5d2f55 | 1994 | if (seq->buf) |
0fe2f1e9 | 1995 | seq->size = GFS2_SEQ_GOODSIZE; |
a245769f SW |
1996 | } |
1997 | return ret; | |
1998 | } | |
1999 | ||
2000 | static int gfs2_sbstats_open(struct inode *inode, struct file *file) | |
2001 | { | |
2002 | int ret = seq_open_private(file, &gfs2_sbstats_seq_ops, | |
2003 | sizeof(struct gfs2_glock_iter)); | |
2004 | if (ret == 0) { | |
2005 | struct seq_file *seq = file->private_data; | |
2006 | struct gfs2_glock_iter *gi = seq->private; | |
2007 | gi->sdp = inode->i_private; | |
2008 | } | |
2009 | return ret; | |
2010 | } | |
2011 | ||
2012 | static const struct file_operations gfs2_glocks_fops = { | |
2013 | .owner = THIS_MODULE, | |
2014 | .open = gfs2_glocks_open, | |
2015 | .read = seq_read, | |
2016 | .llseek = seq_lseek, | |
2017 | .release = seq_release_private, | |
2018 | }; | |
2019 | ||
2020 | static const struct file_operations gfs2_glstats_fops = { | |
7c52b166 | 2021 | .owner = THIS_MODULE, |
a245769f SW |
2022 | .open = gfs2_glstats_open, |
2023 | .read = seq_read, | |
2024 | .llseek = seq_lseek, | |
2025 | .release = seq_release_private, | |
2026 | }; | |
2027 | ||
2028 | static const struct file_operations gfs2_sbstats_fops = { | |
2029 | .owner = THIS_MODULE, | |
2030 | .open = gfs2_sbstats_open, | |
7c52b166 RP |
2031 | .read = seq_read, |
2032 | .llseek = seq_lseek, | |
6802e340 | 2033 | .release = seq_release_private, |
7c52b166 RP |
2034 | }; |
2035 | ||
2036 | int gfs2_create_debugfs_file(struct gfs2_sbd *sdp) | |
2037 | { | |
5f882096 RP |
2038 | sdp->debugfs_dir = debugfs_create_dir(sdp->sd_table_name, gfs2_root); |
2039 | if (!sdp->debugfs_dir) | |
2040 | return -ENOMEM; | |
2041 | sdp->debugfs_dentry_glocks = debugfs_create_file("glocks", | |
2042 | S_IFREG | S_IRUGO, | |
2043 | sdp->debugfs_dir, sdp, | |
a245769f | 2044 | &gfs2_glocks_fops); |
5f882096 | 2045 | if (!sdp->debugfs_dentry_glocks) |
a245769f SW |
2046 | goto fail; |
2047 | ||
2048 | sdp->debugfs_dentry_glstats = debugfs_create_file("glstats", | |
2049 | S_IFREG | S_IRUGO, | |
2050 | sdp->debugfs_dir, sdp, | |
2051 | &gfs2_glstats_fops); | |
2052 | if (!sdp->debugfs_dentry_glstats) | |
2053 | goto fail; | |
2054 | ||
2055 | sdp->debugfs_dentry_sbstats = debugfs_create_file("sbstats", | |
2056 | S_IFREG | S_IRUGO, | |
2057 | sdp->debugfs_dir, sdp, | |
2058 | &gfs2_sbstats_fops); | |
2059 | if (!sdp->debugfs_dentry_sbstats) | |
2060 | goto fail; | |
7c52b166 RP |
2061 | |
2062 | return 0; | |
a245769f SW |
2063 | fail: |
2064 | gfs2_delete_debugfs_file(sdp); | |
2065 | return -ENOMEM; | |
7c52b166 RP |
2066 | } |
2067 | ||
2068 | void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp) | |
2069 | { | |
a245769f | 2070 | if (sdp->debugfs_dir) { |
5f882096 RP |
2071 | if (sdp->debugfs_dentry_glocks) { |
2072 | debugfs_remove(sdp->debugfs_dentry_glocks); | |
2073 | sdp->debugfs_dentry_glocks = NULL; | |
2074 | } | |
a245769f SW |
2075 | if (sdp->debugfs_dentry_glstats) { |
2076 | debugfs_remove(sdp->debugfs_dentry_glstats); | |
2077 | sdp->debugfs_dentry_glstats = NULL; | |
2078 | } | |
2079 | if (sdp->debugfs_dentry_sbstats) { | |
2080 | debugfs_remove(sdp->debugfs_dentry_sbstats); | |
2081 | sdp->debugfs_dentry_sbstats = NULL; | |
2082 | } | |
5f882096 RP |
2083 | debugfs_remove(sdp->debugfs_dir); |
2084 | sdp->debugfs_dir = NULL; | |
2085 | } | |
7c52b166 RP |
2086 | } |
2087 | ||
2088 | int gfs2_register_debugfs(void) | |
2089 | { | |
2090 | gfs2_root = debugfs_create_dir("gfs2", NULL); | |
2091 | return gfs2_root ? 0 : -ENOMEM; | |
2092 | } | |
2093 | ||
2094 | void gfs2_unregister_debugfs(void) | |
2095 | { | |
2096 | debugfs_remove(gfs2_root); | |
5f882096 | 2097 | gfs2_root = NULL; |
7c52b166 | 2098 | } |