Commit | Line | Data |
---|---|---|
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 SW |
58 | static int __dump_glock(struct seq_file *seq, const struct gfs2_glock *gl); |
59 | #define GLOCK_BUG_ON(gl,x) do { if (unlikely(x)) { __dump_glock(NULL, gl); BUG(); } } while(0) | |
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 |
087efdd3 SW |
70 | #define GFS2_GL_HASH_SIZE (1 << GFS2_GL_HASH_SHIFT) |
71 | #define GFS2_GL_HASH_MASK (GFS2_GL_HASH_SIZE - 1) | |
72 | ||
bc015cb8 | 73 | static struct hlist_bl_head gl_hash_table[GFS2_GL_HASH_SIZE]; |
04b933f2 | 74 | static struct dentry *gfs2_root; |
087efdd3 | 75 | |
b3b94faa DT |
76 | /** |
77 | * gl_hash() - Turn glock number into hash bucket number | |
78 | * @lock: The glock number | |
79 | * | |
80 | * Returns: The number of the corresponding hash bucket | |
81 | */ | |
82 | ||
b8547856 SW |
83 | static unsigned int gl_hash(const struct gfs2_sbd *sdp, |
84 | const struct lm_lockname *name) | |
b3b94faa DT |
85 | { |
86 | unsigned int h; | |
87 | ||
cd915493 | 88 | h = jhash(&name->ln_number, sizeof(u64), 0); |
b3b94faa | 89 | h = jhash(&name->ln_type, sizeof(unsigned int), h); |
b8547856 | 90 | h = jhash(&sdp, sizeof(struct gfs2_sbd *), h); |
b3b94faa DT |
91 | h &= GFS2_GL_HASH_MASK; |
92 | ||
93 | return h; | |
94 | } | |
95 | ||
bc015cb8 SW |
96 | static inline void spin_lock_bucket(unsigned int hash) |
97 | { | |
1879fd6a | 98 | hlist_bl_lock(&gl_hash_table[hash]); |
bc015cb8 | 99 | } |
b3b94faa | 100 | |
bc015cb8 SW |
101 | static inline void spin_unlock_bucket(unsigned int hash) |
102 | { | |
1879fd6a | 103 | hlist_bl_unlock(&gl_hash_table[hash]); |
bc015cb8 | 104 | } |
b3b94faa | 105 | |
fc0e38da | 106 | static void gfs2_glock_dealloc(struct rcu_head *rcu) |
b3b94faa | 107 | { |
bc015cb8 | 108 | struct gfs2_glock *gl = container_of(rcu, struct gfs2_glock, gl_rcu); |
b3b94faa | 109 | |
bc015cb8 SW |
110 | if (gl->gl_ops->go_flags & GLOF_ASPACE) |
111 | kmem_cache_free(gfs2_glock_aspace_cachep, gl); | |
112 | else | |
113 | kmem_cache_free(gfs2_glock_cachep, gl); | |
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 SW |
539 | spin_unlock(&gl->gl_spin); |
540 | if (glops->go_xmote_th) | |
541 | glops->go_xmote_th(gl); | |
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); | |
550 | GLOCK_BUG_ON(gl, ret); | |
551 | } else { /* lock_nolock */ | |
552 | finish_xmote(gl, target); | |
6802e340 SW |
553 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
554 | gfs2_glock_put(gl); | |
6802e340 | 555 | } |
921169ca | 556 | |
6802e340 SW |
557 | spin_lock(&gl->gl_spin); |
558 | } | |
559 | ||
560 | /** | |
561 | * find_first_holder - find the first "holder" gh | |
562 | * @gl: the glock | |
563 | */ | |
564 | ||
565 | static inline struct gfs2_holder *find_first_holder(const struct gfs2_glock *gl) | |
566 | { | |
567 | struct gfs2_holder *gh; | |
568 | ||
569 | if (!list_empty(&gl->gl_holders)) { | |
570 | gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list); | |
571 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
572 | return gh; | |
573 | } | |
574 | return NULL; | |
575 | } | |
576 | ||
577 | /** | |
578 | * run_queue - do all outstanding tasks related to a glock | |
579 | * @gl: The glock in question | |
580 | * @nonblock: True if we must not block in run_queue | |
581 | * | |
582 | */ | |
583 | ||
584 | static void run_queue(struct gfs2_glock *gl, const int nonblock) | |
55ba474d HH |
585 | __releases(&gl->gl_spin) |
586 | __acquires(&gl->gl_spin) | |
6802e340 SW |
587 | { |
588 | struct gfs2_holder *gh = NULL; | |
813e0c46 | 589 | int ret; |
6802e340 SW |
590 | |
591 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) | |
592 | return; | |
593 | ||
594 | GLOCK_BUG_ON(gl, test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)); | |
595 | ||
596 | if (test_bit(GLF_DEMOTE, &gl->gl_flags) && | |
597 | gl->gl_demote_state != gl->gl_state) { | |
598 | if (find_first_holder(gl)) | |
d8348de0 | 599 | goto out_unlock; |
6802e340 SW |
600 | if (nonblock) |
601 | goto out_sched; | |
602 | set_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags); | |
265d529c | 603 | GLOCK_BUG_ON(gl, gl->gl_demote_state == LM_ST_EXCLUSIVE); |
6802e340 SW |
604 | gl->gl_target = gl->gl_demote_state; |
605 | } else { | |
606 | if (test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
607 | gfs2_demote_wake(gl); | |
813e0c46 SW |
608 | ret = do_promote(gl); |
609 | if (ret == 0) | |
d8348de0 | 610 | goto out_unlock; |
813e0c46 | 611 | if (ret == 2) |
a228df63 | 612 | goto out; |
6802e340 SW |
613 | gh = find_first_waiter(gl); |
614 | gl->gl_target = gh->gh_state; | |
615 | if (!(gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) | |
616 | do_error(gl, 0); /* Fail queued try locks */ | |
617 | } | |
618 | do_xmote(gl, gh, gl->gl_target); | |
a228df63 | 619 | out: |
6802e340 SW |
620 | return; |
621 | ||
622 | out_sched: | |
7e71c55e SW |
623 | clear_bit(GLF_LOCK, &gl->gl_flags); |
624 | smp_mb__after_clear_bit(); | |
6802e340 SW |
625 | gfs2_glock_hold(gl); |
626 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) | |
8ff22a6f | 627 | gfs2_glock_put_nolock(gl); |
7e71c55e SW |
628 | return; |
629 | ||
d8348de0 | 630 | out_unlock: |
6802e340 | 631 | clear_bit(GLF_LOCK, &gl->gl_flags); |
7e71c55e SW |
632 | smp_mb__after_clear_bit(); |
633 | return; | |
6802e340 SW |
634 | } |
635 | ||
b94a170e BM |
636 | static void delete_work_func(struct work_struct *work) |
637 | { | |
638 | struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_delete); | |
639 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
044b9414 | 640 | struct gfs2_inode *ip; |
b94a170e | 641 | struct inode *inode; |
044b9414 SW |
642 | u64 no_addr = gl->gl_name.ln_number; |
643 | ||
644 | ip = gl->gl_object; | |
645 | /* Note: Unsafe to dereference ip as we don't hold right refs/locks */ | |
b94a170e | 646 | |
b94a170e | 647 | if (ip) |
4667a0ec | 648 | inode = gfs2_ilookup(sdp->sd_vfs, no_addr, 1); |
044b9414 SW |
649 | else |
650 | inode = gfs2_lookup_by_inum(sdp, no_addr, NULL, GFS2_BLKST_UNLINKED); | |
651 | if (inode && !IS_ERR(inode)) { | |
652 | d_prune_aliases(inode); | |
653 | iput(inode); | |
b94a170e BM |
654 | } |
655 | gfs2_glock_put(gl); | |
656 | } | |
657 | ||
c4f68a13 BM |
658 | static void glock_work_func(struct work_struct *work) |
659 | { | |
6802e340 | 660 | unsigned long delay = 0; |
c4f68a13 | 661 | struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_work.work); |
26bb7505 | 662 | int drop_ref = 0; |
c4f68a13 | 663 | |
26bb7505 | 664 | if (test_and_clear_bit(GLF_REPLY_PENDING, &gl->gl_flags)) { |
6802e340 | 665 | finish_xmote(gl, gl->gl_reply); |
26bb7505 SW |
666 | drop_ref = 1; |
667 | } | |
c4f68a13 | 668 | spin_lock(&gl->gl_spin); |
f90e5b5b | 669 | if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && |
265d529c SW |
670 | gl->gl_state != LM_ST_UNLOCKED && |
671 | gl->gl_demote_state != LM_ST_EXCLUSIVE) { | |
6802e340 | 672 | unsigned long holdtime, now = jiffies; |
f90e5b5b | 673 | |
7cf8dcd3 | 674 | holdtime = gl->gl_tchange + gl->gl_hold_time; |
6802e340 SW |
675 | if (time_before(now, holdtime)) |
676 | delay = holdtime - now; | |
f90e5b5b BP |
677 | |
678 | if (!delay) { | |
679 | clear_bit(GLF_PENDING_DEMOTE, &gl->gl_flags); | |
680 | set_bit(GLF_DEMOTE, &gl->gl_flags); | |
681 | } | |
6802e340 SW |
682 | } |
683 | run_queue(gl, 0); | |
c4f68a13 | 684 | spin_unlock(&gl->gl_spin); |
7cf8dcd3 | 685 | if (!delay) |
6802e340 | 686 | gfs2_glock_put(gl); |
7cf8dcd3 BP |
687 | else { |
688 | if (gl->gl_name.ln_type != LM_TYPE_INODE) | |
689 | delay = 0; | |
690 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0) | |
691 | gfs2_glock_put(gl); | |
692 | } | |
26bb7505 SW |
693 | if (drop_ref) |
694 | gfs2_glock_put(gl); | |
c4f68a13 BM |
695 | } |
696 | ||
b3b94faa DT |
697 | /** |
698 | * gfs2_glock_get() - Get a glock, or create one if one doesn't exist | |
699 | * @sdp: The GFS2 superblock | |
700 | * @number: the lock number | |
701 | * @glops: The glock_operations to use | |
702 | * @create: If 0, don't create the glock if it doesn't exist | |
703 | * @glp: the glock is returned here | |
704 | * | |
705 | * This does not lock a glock, just finds/creates structures for one. | |
706 | * | |
707 | * Returns: errno | |
708 | */ | |
709 | ||
cd915493 | 710 | int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 | 711 | const struct gfs2_glock_operations *glops, int create, |
b3b94faa DT |
712 | struct gfs2_glock **glp) |
713 | { | |
009d8518 | 714 | struct super_block *s = sdp->sd_vfs; |
37b2fa6a | 715 | struct lm_lockname name = { .ln_number = number, .ln_type = glops->go_type }; |
b3b94faa | 716 | struct gfs2_glock *gl, *tmp; |
37b2fa6a | 717 | unsigned int hash = gl_hash(sdp, &name); |
009d8518 | 718 | struct address_space *mapping; |
bc015cb8 | 719 | struct kmem_cache *cachep; |
b3b94faa | 720 | |
bc015cb8 | 721 | rcu_read_lock(); |
37b2fa6a | 722 | gl = search_bucket(hash, sdp, &name); |
bc015cb8 | 723 | rcu_read_unlock(); |
b3b94faa | 724 | |
64d576ba SW |
725 | *glp = gl; |
726 | if (gl) | |
b3b94faa | 727 | return 0; |
64d576ba SW |
728 | if (!create) |
729 | return -ENOENT; | |
b3b94faa | 730 | |
009d8518 | 731 | if (glops->go_flags & GLOF_ASPACE) |
bc015cb8 | 732 | cachep = gfs2_glock_aspace_cachep; |
009d8518 | 733 | else |
bc015cb8 SW |
734 | cachep = gfs2_glock_cachep; |
735 | gl = kmem_cache_alloc(cachep, GFP_KERNEL); | |
b3b94faa DT |
736 | if (!gl) |
737 | return -ENOMEM; | |
738 | ||
8f05228e | 739 | atomic_inc(&sdp->sd_glock_disposal); |
a245769f | 740 | gl->gl_sbd = sdp; |
ec45d9f5 | 741 | gl->gl_flags = 0; |
b3b94faa | 742 | gl->gl_name = name; |
16feb9fe | 743 | atomic_set(&gl->gl_ref, 1); |
b3b94faa | 744 | gl->gl_state = LM_ST_UNLOCKED; |
6802e340 | 745 | gl->gl_target = LM_ST_UNLOCKED; |
c4f68a13 | 746 | gl->gl_demote_state = LM_ST_EXCLUSIVE; |
37b2fa6a | 747 | gl->gl_hash = hash; |
b3b94faa | 748 | gl->gl_ops = glops; |
a245769f SW |
749 | gl->gl_dstamp = ktime_set(0, 0); |
750 | preempt_disable(); | |
751 | /* We use the global stats to estimate the initial per-glock stats */ | |
752 | gl->gl_stats = this_cpu_ptr(sdp->sd_lkstats)->lkstats[glops->go_type]; | |
753 | preempt_enable(); | |
754 | gl->gl_stats.stats[GFS2_LKS_DCOUNT] = 0; | |
755 | gl->gl_stats.stats[GFS2_LKS_QCOUNT] = 0; | |
f057f6cd | 756 | memset(&gl->gl_lksb, 0, sizeof(struct dlm_lksb)); |
90306c41 | 757 | memset(gl->gl_lvb, 0, 32 * sizeof(char)); |
f057f6cd | 758 | gl->gl_lksb.sb_lvbptr = gl->gl_lvb; |
c4f68a13 | 759 | gl->gl_tchange = jiffies; |
ec45d9f5 | 760 | gl->gl_object = NULL; |
7cf8dcd3 | 761 | gl->gl_hold_time = GL_GLOCK_DFT_HOLD; |
c4f68a13 | 762 | INIT_DELAYED_WORK(&gl->gl_work, glock_work_func); |
b94a170e | 763 | INIT_WORK(&gl->gl_delete, delete_work_func); |
b3b94faa | 764 | |
009d8518 SW |
765 | mapping = gfs2_glock2aspace(gl); |
766 | if (mapping) { | |
767 | mapping->a_ops = &gfs2_meta_aops; | |
768 | mapping->host = s->s_bdev->bd_inode; | |
769 | mapping->flags = 0; | |
770 | mapping_set_gfp_mask(mapping, GFP_NOFS); | |
771 | mapping->assoc_mapping = NULL; | |
772 | mapping->backing_dev_info = s->s_bdi; | |
773 | mapping->writeback_index = 0; | |
b3b94faa DT |
774 | } |
775 | ||
bc015cb8 | 776 | spin_lock_bucket(hash); |
37b2fa6a | 777 | tmp = search_bucket(hash, sdp, &name); |
b3b94faa | 778 | if (tmp) { |
bc015cb8 SW |
779 | spin_unlock_bucket(hash); |
780 | kmem_cache_free(cachep, gl); | |
fc0e38da | 781 | atomic_dec(&sdp->sd_glock_disposal); |
b3b94faa DT |
782 | gl = tmp; |
783 | } else { | |
bc015cb8 SW |
784 | hlist_bl_add_head_rcu(&gl->gl_list, &gl_hash_table[hash]); |
785 | spin_unlock_bucket(hash); | |
b3b94faa DT |
786 | } |
787 | ||
788 | *glp = gl; | |
789 | ||
790 | return 0; | |
b3b94faa DT |
791 | } |
792 | ||
793 | /** | |
794 | * gfs2_holder_init - initialize a struct gfs2_holder in the default way | |
795 | * @gl: the glock | |
796 | * @state: the state we're requesting | |
797 | * @flags: the modifier flags | |
798 | * @gh: the holder structure | |
799 | * | |
800 | */ | |
801 | ||
190562bd | 802 | void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags, |
b3b94faa DT |
803 | struct gfs2_holder *gh) |
804 | { | |
805 | INIT_LIST_HEAD(&gh->gh_list); | |
806 | gh->gh_gl = gl; | |
d0dc80db | 807 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
b1e058da | 808 | gh->gh_owner_pid = get_pid(task_pid(current)); |
b3b94faa DT |
809 | gh->gh_state = state; |
810 | gh->gh_flags = flags; | |
811 | gh->gh_error = 0; | |
812 | gh->gh_iflags = 0; | |
b3b94faa DT |
813 | gfs2_glock_hold(gl); |
814 | } | |
815 | ||
816 | /** | |
817 | * gfs2_holder_reinit - reinitialize a struct gfs2_holder so we can requeue it | |
818 | * @state: the state we're requesting | |
819 | * @flags: the modifier flags | |
820 | * @gh: the holder structure | |
821 | * | |
822 | * Don't mess with the glock. | |
823 | * | |
824 | */ | |
825 | ||
190562bd | 826 | void gfs2_holder_reinit(unsigned int state, unsigned flags, struct gfs2_holder *gh) |
b3b94faa DT |
827 | { |
828 | gh->gh_state = state; | |
579b78a4 | 829 | gh->gh_flags = flags; |
3b8249f6 | 830 | gh->gh_iflags = 0; |
d0dc80db | 831 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
1a0eae88 BP |
832 | if (gh->gh_owner_pid) |
833 | put_pid(gh->gh_owner_pid); | |
834 | gh->gh_owner_pid = get_pid(task_pid(current)); | |
b3b94faa DT |
835 | } |
836 | ||
837 | /** | |
838 | * gfs2_holder_uninit - uninitialize a holder structure (drop glock reference) | |
839 | * @gh: the holder structure | |
840 | * | |
841 | */ | |
842 | ||
843 | void gfs2_holder_uninit(struct gfs2_holder *gh) | |
844 | { | |
b1e058da | 845 | put_pid(gh->gh_owner_pid); |
b3b94faa DT |
846 | gfs2_glock_put(gh->gh_gl); |
847 | gh->gh_gl = NULL; | |
d0dc80db | 848 | gh->gh_ip = 0; |
b3b94faa DT |
849 | } |
850 | ||
fe64d517 SW |
851 | /** |
852 | * gfs2_glock_holder_wait | |
853 | * @word: unused | |
854 | * | |
855 | * This function and gfs2_glock_demote_wait both show up in the WCHAN | |
856 | * field. Thus I've separated these otherwise identical functions in | |
857 | * order to be more informative to the user. | |
858 | */ | |
859 | ||
860 | static int gfs2_glock_holder_wait(void *word) | |
fee852e3 SW |
861 | { |
862 | schedule(); | |
863 | return 0; | |
864 | } | |
865 | ||
fe64d517 SW |
866 | static int gfs2_glock_demote_wait(void *word) |
867 | { | |
868 | schedule(); | |
869 | return 0; | |
870 | } | |
871 | ||
07a79049 BP |
872 | /** |
873 | * gfs2_glock_wait - wait on a glock acquisition | |
874 | * @gh: the glock holder | |
875 | * | |
876 | * Returns: 0 on success | |
877 | */ | |
878 | ||
879 | int gfs2_glock_wait(struct gfs2_holder *gh) | |
da755fdb | 880 | { |
7cf8dcd3 BP |
881 | unsigned long time1 = jiffies; |
882 | ||
6802e340 | 883 | might_sleep(); |
fe64d517 | 884 | wait_on_bit(&gh->gh_iflags, HIF_WAIT, gfs2_glock_holder_wait, TASK_UNINTERRUPTIBLE); |
7cf8dcd3 BP |
885 | if (time_after(jiffies, time1 + HZ)) /* have we waited > a second? */ |
886 | /* Lengthen the minimum hold time. */ | |
887 | gh->gh_gl->gl_hold_time = min(gh->gh_gl->gl_hold_time + | |
888 | GL_GLOCK_HOLD_INCR, | |
889 | GL_GLOCK_MAX_HOLD); | |
07a79049 | 890 | return gh->gh_error; |
da755fdb SW |
891 | } |
892 | ||
b3b94faa | 893 | /** |
6802e340 SW |
894 | * handle_callback - process a demote request |
895 | * @gl: the glock | |
896 | * @state: the state the caller wants us to change to | |
b3b94faa | 897 | * |
6802e340 SW |
898 | * There are only two requests that we are going to see in actual |
899 | * practise: LM_ST_SHARED and LM_ST_UNLOCKED | |
b3b94faa DT |
900 | */ |
901 | ||
6802e340 | 902 | static void handle_callback(struct gfs2_glock *gl, unsigned int state, |
97cc1025 | 903 | unsigned long delay) |
b3b94faa | 904 | { |
6802e340 | 905 | int bit = delay ? GLF_PENDING_DEMOTE : GLF_DEMOTE; |
b3b94faa | 906 | |
6802e340 SW |
907 | set_bit(bit, &gl->gl_flags); |
908 | if (gl->gl_demote_state == LM_ST_EXCLUSIVE) { | |
909 | gl->gl_demote_state = state; | |
910 | gl->gl_demote_time = jiffies; | |
6802e340 SW |
911 | } else if (gl->gl_demote_state != LM_ST_UNLOCKED && |
912 | gl->gl_demote_state != state) { | |
913 | gl->gl_demote_state = LM_ST_UNLOCKED; | |
b3b94faa | 914 | } |
b94a170e BM |
915 | if (gl->gl_ops->go_callback) |
916 | gl->gl_ops->go_callback(gl); | |
63997775 | 917 | trace_gfs2_demote_rq(gl); |
b3b94faa DT |
918 | } |
919 | ||
6802e340 | 920 | void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...) |
7c52b166 | 921 | { |
5e69069c | 922 | struct va_format vaf; |
7c52b166 RP |
923 | va_list args; |
924 | ||
925 | va_start(args, fmt); | |
5e69069c | 926 | |
6802e340 | 927 | if (seq) { |
1bb49303 | 928 | seq_vprintf(seq, fmt, args); |
6802e340 | 929 | } else { |
5e69069c JP |
930 | vaf.fmt = fmt; |
931 | vaf.va = &args; | |
932 | ||
933 | printk(KERN_ERR " %pV", &vaf); | |
6802e340 | 934 | } |
5e69069c | 935 | |
7c52b166 RP |
936 | va_end(args); |
937 | } | |
938 | ||
b3b94faa DT |
939 | /** |
940 | * add_to_queue - Add a holder to the wait queue (but look for recursion) | |
941 | * @gh: the holder structure to add | |
942 | * | |
6802e340 SW |
943 | * Eventually we should move the recursive locking trap to a |
944 | * debugging option or something like that. This is the fast | |
945 | * path and needs to have the minimum number of distractions. | |
946 | * | |
b3b94faa DT |
947 | */ |
948 | ||
6802e340 | 949 | static inline void add_to_queue(struct gfs2_holder *gh) |
55ba474d HH |
950 | __releases(&gl->gl_spin) |
951 | __acquires(&gl->gl_spin) | |
b3b94faa DT |
952 | { |
953 | struct gfs2_glock *gl = gh->gh_gl; | |
6802e340 SW |
954 | struct gfs2_sbd *sdp = gl->gl_sbd; |
955 | struct list_head *insert_pt = NULL; | |
956 | struct gfs2_holder *gh2; | |
e5dc76b9 | 957 | int try_futile = 0; |
b3b94faa | 958 | |
b1e058da | 959 | BUG_ON(gh->gh_owner_pid == NULL); |
fee852e3 SW |
960 | if (test_and_set_bit(HIF_WAIT, &gh->gh_iflags)) |
961 | BUG(); | |
190562bd | 962 | |
6802e340 SW |
963 | if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { |
964 | if (test_bit(GLF_LOCK, &gl->gl_flags)) | |
e5dc76b9 | 965 | try_futile = !may_grant(gl, gh); |
6802e340 SW |
966 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags)) |
967 | goto fail; | |
968 | } | |
969 | ||
970 | list_for_each_entry(gh2, &gl->gl_holders, gh_list) { | |
971 | if (unlikely(gh2->gh_owner_pid == gh->gh_owner_pid && | |
972 | (gh->gh_gl->gl_ops->go_type != LM_TYPE_FLOCK))) | |
973 | goto trap_recursive; | |
e5dc76b9 BP |
974 | if (try_futile && |
975 | !(gh2->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) { | |
6802e340 SW |
976 | fail: |
977 | gh->gh_error = GLR_TRYFAILED; | |
978 | gfs2_holder_wake(gh); | |
979 | return; | |
b4c20166 | 980 | } |
6802e340 SW |
981 | if (test_bit(HIF_HOLDER, &gh2->gh_iflags)) |
982 | continue; | |
983 | if (unlikely((gh->gh_flags & LM_FLAG_PRIORITY) && !insert_pt)) | |
984 | insert_pt = &gh2->gh_list; | |
985 | } | |
7b5e3d5f | 986 | set_bit(GLF_QUEUED, &gl->gl_flags); |
edae38a6 | 987 | trace_gfs2_glock_queue(gh, 1); |
a245769f SW |
988 | gfs2_glstats_inc(gl, GFS2_LKS_QCOUNT); |
989 | gfs2_sbstats_inc(gl, GFS2_LKS_QCOUNT); | |
6802e340 SW |
990 | if (likely(insert_pt == NULL)) { |
991 | list_add_tail(&gh->gh_list, &gl->gl_holders); | |
992 | if (unlikely(gh->gh_flags & LM_FLAG_PRIORITY)) | |
993 | goto do_cancel; | |
994 | return; | |
995 | } | |
996 | list_add_tail(&gh->gh_list, insert_pt); | |
997 | do_cancel: | |
998 | gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list); | |
999 | if (!(gh->gh_flags & LM_FLAG_PRIORITY)) { | |
1000 | spin_unlock(&gl->gl_spin); | |
048bca22 | 1001 | if (sdp->sd_lockstruct.ls_ops->lm_cancel) |
f057f6cd | 1002 | sdp->sd_lockstruct.ls_ops->lm_cancel(gl); |
6802e340 | 1003 | spin_lock(&gl->gl_spin); |
b3b94faa | 1004 | } |
6802e340 | 1005 | return; |
b3b94faa | 1006 | |
6802e340 SW |
1007 | trap_recursive: |
1008 | print_symbol(KERN_ERR "original: %s\n", gh2->gh_ip); | |
1009 | printk(KERN_ERR "pid: %d\n", pid_nr(gh2->gh_owner_pid)); | |
1010 | printk(KERN_ERR "lock type: %d req lock state : %d\n", | |
1011 | gh2->gh_gl->gl_name.ln_type, gh2->gh_state); | |
1012 | print_symbol(KERN_ERR "new: %s\n", gh->gh_ip); | |
1013 | printk(KERN_ERR "pid: %d\n", pid_nr(gh->gh_owner_pid)); | |
1014 | printk(KERN_ERR "lock type: %d req lock state : %d\n", | |
1015 | gh->gh_gl->gl_name.ln_type, gh->gh_state); | |
1016 | __dump_glock(NULL, gl); | |
1017 | BUG(); | |
b3b94faa DT |
1018 | } |
1019 | ||
1020 | /** | |
1021 | * gfs2_glock_nq - enqueue a struct gfs2_holder onto a glock (acquire a glock) | |
1022 | * @gh: the holder structure | |
1023 | * | |
1024 | * if (gh->gh_flags & GL_ASYNC), this never returns an error | |
1025 | * | |
1026 | * Returns: 0, GLR_TRYFAILED, or errno on failure | |
1027 | */ | |
1028 | ||
1029 | int gfs2_glock_nq(struct gfs2_holder *gh) | |
1030 | { | |
1031 | struct gfs2_glock *gl = gh->gh_gl; | |
1032 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1033 | int error = 0; | |
1034 | ||
6802e340 | 1035 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
b3b94faa | 1036 | return -EIO; |
b3b94faa | 1037 | |
f42ab085 SW |
1038 | if (test_bit(GLF_LRU, &gl->gl_flags)) |
1039 | gfs2_glock_remove_from_lru(gl); | |
1040 | ||
b3b94faa DT |
1041 | spin_lock(&gl->gl_spin); |
1042 | add_to_queue(gh); | |
0809f6ec SW |
1043 | if ((LM_FLAG_NOEXP & gh->gh_flags) && |
1044 | test_and_clear_bit(GLF_FROZEN, &gl->gl_flags)) | |
1045 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); | |
6802e340 | 1046 | run_queue(gl, 1); |
b3b94faa DT |
1047 | spin_unlock(&gl->gl_spin); |
1048 | ||
6802e340 SW |
1049 | if (!(gh->gh_flags & GL_ASYNC)) |
1050 | error = gfs2_glock_wait(gh); | |
b3b94faa | 1051 | |
b3b94faa DT |
1052 | return error; |
1053 | } | |
1054 | ||
1055 | /** | |
1056 | * gfs2_glock_poll - poll to see if an async request has been completed | |
1057 | * @gh: the holder | |
1058 | * | |
1059 | * Returns: 1 if the request is ready to be gfs2_glock_wait()ed on | |
1060 | */ | |
1061 | ||
1062 | int gfs2_glock_poll(struct gfs2_holder *gh) | |
1063 | { | |
6802e340 | 1064 | return test_bit(HIF_WAIT, &gh->gh_iflags) ? 0 : 1; |
b3b94faa DT |
1065 | } |
1066 | ||
1067 | /** | |
1068 | * gfs2_glock_dq - dequeue a struct gfs2_holder from a glock (release a glock) | |
1069 | * @gh: the glock holder | |
1070 | * | |
1071 | */ | |
1072 | ||
1073 | void gfs2_glock_dq(struct gfs2_holder *gh) | |
1074 | { | |
1075 | struct gfs2_glock *gl = gh->gh_gl; | |
8fb4b536 | 1076 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
c4f68a13 | 1077 | unsigned delay = 0; |
6802e340 | 1078 | int fast_path = 0; |
b3b94faa | 1079 | |
6802e340 | 1080 | spin_lock(&gl->gl_spin); |
b3b94faa | 1081 | if (gh->gh_flags & GL_NOCACHE) |
97cc1025 | 1082 | handle_callback(gl, LM_ST_UNLOCKED, 0); |
b3b94faa | 1083 | |
b3b94faa | 1084 | list_del_init(&gh->gh_list); |
6802e340 | 1085 | if (find_first_holder(gl) == NULL) { |
3042a2cc | 1086 | if (glops->go_unlock) { |
6802e340 | 1087 | GLOCK_BUG_ON(gl, test_and_set_bit(GLF_LOCK, &gl->gl_flags)); |
3042a2cc | 1088 | spin_unlock(&gl->gl_spin); |
b3b94faa | 1089 | glops->go_unlock(gh); |
3042a2cc | 1090 | spin_lock(&gl->gl_spin); |
6802e340 | 1091 | clear_bit(GLF_LOCK, &gl->gl_flags); |
3042a2cc | 1092 | } |
6802e340 SW |
1093 | if (list_empty(&gl->gl_holders) && |
1094 | !test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && | |
1095 | !test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
1096 | fast_path = 1; | |
b3b94faa | 1097 | } |
4abb6ad9 BP |
1098 | if (!test_bit(GLF_LFLUSH, &gl->gl_flags) && demote_ok(gl)) |
1099 | gfs2_glock_add_to_lru(gl); | |
1100 | ||
63997775 | 1101 | trace_gfs2_glock_queue(gh, 0); |
b3b94faa | 1102 | spin_unlock(&gl->gl_spin); |
6802e340 SW |
1103 | if (likely(fast_path)) |
1104 | return; | |
c4f68a13 BM |
1105 | |
1106 | gfs2_glock_hold(gl); | |
1107 | if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && | |
7cf8dcd3 BP |
1108 | !test_bit(GLF_DEMOTE, &gl->gl_flags) && |
1109 | gl->gl_name.ln_type == LM_TYPE_INODE) | |
1110 | delay = gl->gl_hold_time; | |
c4f68a13 BM |
1111 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0) |
1112 | gfs2_glock_put(gl); | |
b3b94faa DT |
1113 | } |
1114 | ||
d93cfa98 AD |
1115 | void gfs2_glock_dq_wait(struct gfs2_holder *gh) |
1116 | { | |
1117 | struct gfs2_glock *gl = gh->gh_gl; | |
1118 | gfs2_glock_dq(gh); | |
81e1d450 BP |
1119 | might_sleep(); |
1120 | wait_on_bit(&gl->gl_flags, GLF_DEMOTE, gfs2_glock_demote_wait, TASK_UNINTERRUPTIBLE); | |
d93cfa98 AD |
1121 | } |
1122 | ||
b3b94faa DT |
1123 | /** |
1124 | * gfs2_glock_dq_uninit - dequeue a holder from a glock and initialize it | |
1125 | * @gh: the holder structure | |
1126 | * | |
1127 | */ | |
1128 | ||
1129 | void gfs2_glock_dq_uninit(struct gfs2_holder *gh) | |
1130 | { | |
1131 | gfs2_glock_dq(gh); | |
1132 | gfs2_holder_uninit(gh); | |
1133 | } | |
1134 | ||
1135 | /** | |
1136 | * gfs2_glock_nq_num - acquire a glock based on lock number | |
1137 | * @sdp: the filesystem | |
1138 | * @number: the lock number | |
1139 | * @glops: the glock operations for the type of glock | |
1140 | * @state: the state to acquire the glock in | |
25985edc | 1141 | * @flags: modifier flags for the acquisition |
b3b94faa DT |
1142 | * @gh: the struct gfs2_holder |
1143 | * | |
1144 | * Returns: errno | |
1145 | */ | |
1146 | ||
cd915493 | 1147 | int gfs2_glock_nq_num(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 SW |
1148 | const struct gfs2_glock_operations *glops, |
1149 | unsigned int state, int flags, struct gfs2_holder *gh) | |
b3b94faa DT |
1150 | { |
1151 | struct gfs2_glock *gl; | |
1152 | int error; | |
1153 | ||
1154 | error = gfs2_glock_get(sdp, number, glops, CREATE, &gl); | |
1155 | if (!error) { | |
1156 | error = gfs2_glock_nq_init(gl, state, flags, gh); | |
1157 | gfs2_glock_put(gl); | |
1158 | } | |
1159 | ||
1160 | return error; | |
1161 | } | |
1162 | ||
1163 | /** | |
1164 | * glock_compare - Compare two struct gfs2_glock structures for sorting | |
1165 | * @arg_a: the first structure | |
1166 | * @arg_b: the second structure | |
1167 | * | |
1168 | */ | |
1169 | ||
1170 | static int glock_compare(const void *arg_a, const void *arg_b) | |
1171 | { | |
a5e08a9e SW |
1172 | const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a; |
1173 | const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b; | |
1174 | const struct lm_lockname *a = &gh_a->gh_gl->gl_name; | |
1175 | const struct lm_lockname *b = &gh_b->gh_gl->gl_name; | |
b3b94faa DT |
1176 | |
1177 | if (a->ln_number > b->ln_number) | |
a5e08a9e SW |
1178 | return 1; |
1179 | if (a->ln_number < b->ln_number) | |
1180 | return -1; | |
1c0f4872 | 1181 | BUG_ON(gh_a->gh_gl->gl_ops->go_type == gh_b->gh_gl->gl_ops->go_type); |
a5e08a9e | 1182 | return 0; |
b3b94faa DT |
1183 | } |
1184 | ||
1185 | /** | |
1186 | * nq_m_sync - synchonously acquire more than one glock in deadlock free order | |
1187 | * @num_gh: the number of structures | |
1188 | * @ghs: an array of struct gfs2_holder structures | |
1189 | * | |
1190 | * Returns: 0 on success (all glocks acquired), | |
1191 | * errno on failure (no glocks acquired) | |
1192 | */ | |
1193 | ||
1194 | static int nq_m_sync(unsigned int num_gh, struct gfs2_holder *ghs, | |
1195 | struct gfs2_holder **p) | |
1196 | { | |
1197 | unsigned int x; | |
1198 | int error = 0; | |
1199 | ||
1200 | for (x = 0; x < num_gh; x++) | |
1201 | p[x] = &ghs[x]; | |
1202 | ||
1203 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare, NULL); | |
1204 | ||
1205 | for (x = 0; x < num_gh; x++) { | |
1206 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1207 | ||
1208 | error = gfs2_glock_nq(p[x]); | |
1209 | if (error) { | |
1210 | while (x--) | |
1211 | gfs2_glock_dq(p[x]); | |
1212 | break; | |
1213 | } | |
1214 | } | |
1215 | ||
1216 | return error; | |
1217 | } | |
1218 | ||
1219 | /** | |
1220 | * gfs2_glock_nq_m - acquire multiple glocks | |
1221 | * @num_gh: the number of structures | |
1222 | * @ghs: an array of struct gfs2_holder structures | |
1223 | * | |
b3b94faa DT |
1224 | * |
1225 | * Returns: 0 on success (all glocks acquired), | |
1226 | * errno on failure (no glocks acquired) | |
1227 | */ | |
1228 | ||
1229 | int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1230 | { | |
eaf5bd3c SW |
1231 | struct gfs2_holder *tmp[4]; |
1232 | struct gfs2_holder **pph = tmp; | |
b3b94faa DT |
1233 | int error = 0; |
1234 | ||
eaf5bd3c SW |
1235 | switch(num_gh) { |
1236 | case 0: | |
b3b94faa | 1237 | return 0; |
eaf5bd3c | 1238 | case 1: |
b3b94faa DT |
1239 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); |
1240 | return gfs2_glock_nq(ghs); | |
eaf5bd3c SW |
1241 | default: |
1242 | if (num_gh <= 4) | |
b3b94faa | 1243 | break; |
eaf5bd3c SW |
1244 | pph = kmalloc(num_gh * sizeof(struct gfs2_holder *), GFP_NOFS); |
1245 | if (!pph) | |
1246 | return -ENOMEM; | |
b3b94faa DT |
1247 | } |
1248 | ||
eaf5bd3c | 1249 | error = nq_m_sync(num_gh, ghs, pph); |
b3b94faa | 1250 | |
eaf5bd3c SW |
1251 | if (pph != tmp) |
1252 | kfree(pph); | |
b3b94faa DT |
1253 | |
1254 | return error; | |
1255 | } | |
1256 | ||
1257 | /** | |
1258 | * gfs2_glock_dq_m - release multiple glocks | |
1259 | * @num_gh: the number of structures | |
1260 | * @ghs: an array of struct gfs2_holder structures | |
1261 | * | |
1262 | */ | |
1263 | ||
1264 | void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1265 | { | |
fa1bbdea BP |
1266 | while (num_gh--) |
1267 | gfs2_glock_dq(&ghs[num_gh]); | |
b3b94faa DT |
1268 | } |
1269 | ||
1270 | /** | |
1271 | * gfs2_glock_dq_uninit_m - release multiple glocks | |
1272 | * @num_gh: the number of structures | |
1273 | * @ghs: an array of struct gfs2_holder structures | |
1274 | * | |
1275 | */ | |
1276 | ||
1277 | void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1278 | { | |
fa1bbdea BP |
1279 | while (num_gh--) |
1280 | gfs2_glock_dq_uninit(&ghs[num_gh]); | |
b3b94faa DT |
1281 | } |
1282 | ||
f057f6cd | 1283 | void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state) |
da755fdb | 1284 | { |
c4f68a13 BM |
1285 | unsigned long delay = 0; |
1286 | unsigned long holdtime; | |
1287 | unsigned long now = jiffies; | |
b3b94faa | 1288 | |
f057f6cd | 1289 | gfs2_glock_hold(gl); |
7cf8dcd3 BP |
1290 | holdtime = gl->gl_tchange + gl->gl_hold_time; |
1291 | if (test_bit(GLF_QUEUED, &gl->gl_flags) && | |
1292 | gl->gl_name.ln_type == LM_TYPE_INODE) { | |
7b5e3d5f SW |
1293 | if (time_before(now, holdtime)) |
1294 | delay = holdtime - now; | |
1295 | if (test_bit(GLF_REPLY_PENDING, &gl->gl_flags)) | |
7cf8dcd3 | 1296 | delay = gl->gl_hold_time; |
7b5e3d5f | 1297 | } |
b3b94faa | 1298 | |
6802e340 | 1299 | spin_lock(&gl->gl_spin); |
97cc1025 | 1300 | handle_callback(gl, state, delay); |
6802e340 | 1301 | spin_unlock(&gl->gl_spin); |
c4f68a13 BM |
1302 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0) |
1303 | gfs2_glock_put(gl); | |
b3b94faa DT |
1304 | } |
1305 | ||
0809f6ec SW |
1306 | /** |
1307 | * gfs2_should_freeze - Figure out if glock should be frozen | |
1308 | * @gl: The glock in question | |
1309 | * | |
1310 | * Glocks are not frozen if (a) the result of the dlm operation is | |
1311 | * an error, (b) the locking operation was an unlock operation or | |
1312 | * (c) if there is a "noexp" flagged request anywhere in the queue | |
1313 | * | |
1314 | * Returns: 1 if freezing should occur, 0 otherwise | |
1315 | */ | |
1316 | ||
1317 | static int gfs2_should_freeze(const struct gfs2_glock *gl) | |
1318 | { | |
1319 | const struct gfs2_holder *gh; | |
1320 | ||
1321 | if (gl->gl_reply & ~LM_OUT_ST_MASK) | |
1322 | return 0; | |
1323 | if (gl->gl_target == LM_ST_UNLOCKED) | |
1324 | return 0; | |
1325 | ||
1326 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
1327 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
1328 | continue; | |
1329 | if (LM_FLAG_NOEXP & gh->gh_flags) | |
1330 | return 0; | |
1331 | } | |
1332 | ||
1333 | return 1; | |
1334 | } | |
1335 | ||
b3b94faa | 1336 | /** |
f057f6cd SW |
1337 | * gfs2_glock_complete - Callback used by locking |
1338 | * @gl: Pointer to the glock | |
1339 | * @ret: The return value from the dlm | |
b3b94faa | 1340 | * |
47a25380 SW |
1341 | * The gl_reply field is under the gl_spin lock so that it is ok |
1342 | * to use a bitfield shared with other glock state fields. | |
b3b94faa DT |
1343 | */ |
1344 | ||
f057f6cd | 1345 | void gfs2_glock_complete(struct gfs2_glock *gl, int ret) |
b3b94faa | 1346 | { |
f057f6cd | 1347 | struct lm_lockstruct *ls = &gl->gl_sbd->sd_lockstruct; |
0809f6ec | 1348 | |
47a25380 | 1349 | spin_lock(&gl->gl_spin); |
f057f6cd | 1350 | gl->gl_reply = ret; |
0809f6ec | 1351 | |
e0c2a9aa | 1352 | if (unlikely(test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))) { |
0809f6ec | 1353 | if (gfs2_should_freeze(gl)) { |
f057f6cd | 1354 | set_bit(GLF_FROZEN, &gl->gl_flags); |
0809f6ec | 1355 | spin_unlock(&gl->gl_spin); |
b3b94faa | 1356 | return; |
0809f6ec | 1357 | } |
b3b94faa | 1358 | } |
47a25380 SW |
1359 | |
1360 | spin_unlock(&gl->gl_spin); | |
f057f6cd | 1361 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
47a25380 | 1362 | smp_wmb(); |
f057f6cd SW |
1363 | gfs2_glock_hold(gl); |
1364 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) | |
1365 | gfs2_glock_put(gl); | |
b3b94faa DT |
1366 | } |
1367 | ||
b3b94faa | 1368 | |
1495f230 YH |
1369 | static int gfs2_shrink_glock_memory(struct shrinker *shrink, |
1370 | struct shrink_control *sc) | |
b3b94faa DT |
1371 | { |
1372 | struct gfs2_glock *gl; | |
97cc1025 SW |
1373 | int may_demote; |
1374 | int nr_skipped = 0; | |
1495f230 YH |
1375 | int nr = sc->nr_to_scan; |
1376 | gfp_t gfp_mask = sc->gfp_mask; | |
97cc1025 | 1377 | LIST_HEAD(skipped); |
b3b94faa | 1378 | |
97cc1025 SW |
1379 | if (nr == 0) |
1380 | goto out; | |
b3b94faa | 1381 | |
97cc1025 SW |
1382 | if (!(gfp_mask & __GFP_FS)) |
1383 | return -1; | |
b3b94faa | 1384 | |
97cc1025 SW |
1385 | spin_lock(&lru_lock); |
1386 | while(nr && !list_empty(&lru_list)) { | |
1387 | gl = list_entry(lru_list.next, struct gfs2_glock, gl_lru); | |
1388 | list_del_init(&gl->gl_lru); | |
627c10b7 | 1389 | clear_bit(GLF_LRU, &gl->gl_flags); |
97cc1025 SW |
1390 | atomic_dec(&lru_count); |
1391 | ||
1392 | /* Test for being demotable */ | |
1393 | if (!test_and_set_bit(GLF_LOCK, &gl->gl_flags)) { | |
1394 | gfs2_glock_hold(gl); | |
97cc1025 SW |
1395 | spin_unlock(&lru_lock); |
1396 | spin_lock(&gl->gl_spin); | |
1397 | may_demote = demote_ok(gl); | |
97cc1025 SW |
1398 | if (may_demote) { |
1399 | handle_callback(gl, LM_ST_UNLOCKED, 0); | |
1400 | nr--; | |
97cc1025 | 1401 | } |
7e71c55e SW |
1402 | clear_bit(GLF_LOCK, &gl->gl_flags); |
1403 | smp_mb__after_clear_bit(); | |
2163b1e6 | 1404 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
b94a170e BM |
1405 | gfs2_glock_put_nolock(gl); |
1406 | spin_unlock(&gl->gl_spin); | |
97cc1025 | 1407 | spin_lock(&lru_lock); |
2163b1e6 | 1408 | continue; |
97cc1025 | 1409 | } |
2163b1e6 SW |
1410 | nr_skipped++; |
1411 | list_add(&gl->gl_lru, &skipped); | |
627c10b7 | 1412 | set_bit(GLF_LRU, &gl->gl_flags); |
b3b94faa | 1413 | } |
97cc1025 SW |
1414 | list_splice(&skipped, &lru_list); |
1415 | atomic_add(nr_skipped, &lru_count); | |
1416 | spin_unlock(&lru_lock); | |
1417 | out: | |
1418 | return (atomic_read(&lru_count) / 100) * sysctl_vfs_cache_pressure; | |
b3b94faa DT |
1419 | } |
1420 | ||
97cc1025 SW |
1421 | static struct shrinker glock_shrinker = { |
1422 | .shrink = gfs2_shrink_glock_memory, | |
1423 | .seeks = DEFAULT_SEEKS, | |
1424 | }; | |
1425 | ||
b3b94faa DT |
1426 | /** |
1427 | * examine_bucket - Call a function for glock in a hash bucket | |
1428 | * @examiner: the function | |
1429 | * @sdp: the filesystem | |
1430 | * @bucket: the bucket | |
1431 | * | |
b3b94faa DT |
1432 | */ |
1433 | ||
bc015cb8 | 1434 | static void examine_bucket(glock_examiner examiner, const struct gfs2_sbd *sdp, |
37b2fa6a | 1435 | unsigned int hash) |
b3b94faa | 1436 | { |
bc015cb8 SW |
1437 | struct gfs2_glock *gl; |
1438 | struct hlist_bl_head *head = &gl_hash_table[hash]; | |
1439 | struct hlist_bl_node *pos; | |
b3b94faa | 1440 | |
bc015cb8 SW |
1441 | rcu_read_lock(); |
1442 | hlist_bl_for_each_entry_rcu(gl, pos, head, gl_list) { | |
1443 | if ((gl->gl_sbd == sdp) && atomic_read(&gl->gl_ref)) | |
24264434 | 1444 | examiner(gl); |
b3b94faa | 1445 | } |
bc015cb8 | 1446 | rcu_read_unlock(); |
8fbbfd21 | 1447 | cond_resched(); |
bc015cb8 SW |
1448 | } |
1449 | ||
1450 | static void glock_hash_walk(glock_examiner examiner, const struct gfs2_sbd *sdp) | |
1451 | { | |
1452 | unsigned x; | |
1453 | ||
1454 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) | |
1455 | examine_bucket(examiner, sdp, x); | |
b3b94faa DT |
1456 | } |
1457 | ||
f057f6cd SW |
1458 | |
1459 | /** | |
1460 | * thaw_glock - thaw out a glock which has an unprocessed reply waiting | |
1461 | * @gl: The glock to thaw | |
1462 | * | |
1463 | * N.B. When we freeze a glock, we leave a ref to the glock outstanding, | |
1464 | * so this has to result in the ref count being dropped by one. | |
1465 | */ | |
1466 | ||
1467 | static void thaw_glock(struct gfs2_glock *gl) | |
1468 | { | |
1469 | if (!test_and_clear_bit(GLF_FROZEN, &gl->gl_flags)) | |
1470 | return; | |
f057f6cd SW |
1471 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
1472 | gfs2_glock_hold(gl); | |
1473 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) | |
1474 | gfs2_glock_put(gl); | |
f057f6cd SW |
1475 | } |
1476 | ||
b3b94faa DT |
1477 | /** |
1478 | * clear_glock - look at a glock and see if we can free it from glock cache | |
1479 | * @gl: the glock to look at | |
1480 | * | |
1481 | */ | |
1482 | ||
1483 | static void clear_glock(struct gfs2_glock *gl) | |
1484 | { | |
f42ab085 | 1485 | gfs2_glock_remove_from_lru(gl); |
b3b94faa | 1486 | |
6802e340 | 1487 | spin_lock(&gl->gl_spin); |
c741c455 | 1488 | if (gl->gl_state != LM_ST_UNLOCKED) |
97cc1025 | 1489 | handle_callback(gl, LM_ST_UNLOCKED, 0); |
6802e340 SW |
1490 | spin_unlock(&gl->gl_spin); |
1491 | gfs2_glock_hold(gl); | |
1492 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) | |
1493 | gfs2_glock_put(gl); | |
b3b94faa DT |
1494 | } |
1495 | ||
f057f6cd SW |
1496 | /** |
1497 | * gfs2_glock_thaw - Thaw any frozen glocks | |
1498 | * @sdp: The super block | |
1499 | * | |
1500 | */ | |
1501 | ||
1502 | void gfs2_glock_thaw(struct gfs2_sbd *sdp) | |
1503 | { | |
bc015cb8 SW |
1504 | glock_hash_walk(thaw_glock, sdp); |
1505 | } | |
f057f6cd | 1506 | |
bc015cb8 SW |
1507 | static int dump_glock(struct seq_file *seq, struct gfs2_glock *gl) |
1508 | { | |
1509 | int ret; | |
1510 | spin_lock(&gl->gl_spin); | |
1511 | ret = __dump_glock(seq, gl); | |
1512 | spin_unlock(&gl->gl_spin); | |
1513 | return ret; | |
1514 | } | |
1515 | ||
1516 | static void dump_glock_func(struct gfs2_glock *gl) | |
1517 | { | |
1518 | dump_glock(NULL, gl); | |
f057f6cd SW |
1519 | } |
1520 | ||
b3b94faa DT |
1521 | /** |
1522 | * gfs2_gl_hash_clear - Empty out the glock hash table | |
1523 | * @sdp: the filesystem | |
1524 | * @wait: wait until it's all gone | |
1525 | * | |
1bdad606 | 1526 | * Called when unmounting the filesystem. |
b3b94faa DT |
1527 | */ |
1528 | ||
fefc03bf | 1529 | void gfs2_gl_hash_clear(struct gfs2_sbd *sdp) |
b3b94faa | 1530 | { |
bc015cb8 | 1531 | glock_hash_walk(clear_glock, sdp); |
8f05228e SW |
1532 | flush_workqueue(glock_workqueue); |
1533 | wait_event(sdp->sd_glock_wait, atomic_read(&sdp->sd_glock_disposal) == 0); | |
bc015cb8 | 1534 | glock_hash_walk(dump_glock_func, sdp); |
b3b94faa DT |
1535 | } |
1536 | ||
813e0c46 SW |
1537 | void gfs2_glock_finish_truncate(struct gfs2_inode *ip) |
1538 | { | |
1539 | struct gfs2_glock *gl = ip->i_gl; | |
1540 | int ret; | |
1541 | ||
1542 | ret = gfs2_truncatei_resume(ip); | |
1543 | gfs2_assert_withdraw(gl->gl_sbd, ret == 0); | |
1544 | ||
1545 | spin_lock(&gl->gl_spin); | |
1546 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
1547 | run_queue(gl, 1); | |
1548 | spin_unlock(&gl->gl_spin); | |
1549 | } | |
1550 | ||
6802e340 | 1551 | static const char *state2str(unsigned state) |
04b933f2 | 1552 | { |
6802e340 SW |
1553 | switch(state) { |
1554 | case LM_ST_UNLOCKED: | |
1555 | return "UN"; | |
1556 | case LM_ST_SHARED: | |
1557 | return "SH"; | |
1558 | case LM_ST_DEFERRED: | |
1559 | return "DF"; | |
1560 | case LM_ST_EXCLUSIVE: | |
1561 | return "EX"; | |
1562 | } | |
1563 | return "??"; | |
1564 | } | |
1565 | ||
1566 | static const char *hflags2str(char *buf, unsigned flags, unsigned long iflags) | |
1567 | { | |
1568 | char *p = buf; | |
1569 | if (flags & LM_FLAG_TRY) | |
1570 | *p++ = 't'; | |
1571 | if (flags & LM_FLAG_TRY_1CB) | |
1572 | *p++ = 'T'; | |
1573 | if (flags & LM_FLAG_NOEXP) | |
1574 | *p++ = 'e'; | |
1575 | if (flags & LM_FLAG_ANY) | |
f057f6cd | 1576 | *p++ = 'A'; |
6802e340 SW |
1577 | if (flags & LM_FLAG_PRIORITY) |
1578 | *p++ = 'p'; | |
1579 | if (flags & GL_ASYNC) | |
1580 | *p++ = 'a'; | |
1581 | if (flags & GL_EXACT) | |
1582 | *p++ = 'E'; | |
6802e340 SW |
1583 | if (flags & GL_NOCACHE) |
1584 | *p++ = 'c'; | |
1585 | if (test_bit(HIF_HOLDER, &iflags)) | |
1586 | *p++ = 'H'; | |
1587 | if (test_bit(HIF_WAIT, &iflags)) | |
1588 | *p++ = 'W'; | |
1589 | if (test_bit(HIF_FIRST, &iflags)) | |
1590 | *p++ = 'F'; | |
1591 | *p = 0; | |
1592 | return buf; | |
04b933f2 RP |
1593 | } |
1594 | ||
b3b94faa DT |
1595 | /** |
1596 | * dump_holder - print information about a glock holder | |
6802e340 | 1597 | * @seq: the seq_file struct |
b3b94faa DT |
1598 | * @gh: the glock holder |
1599 | * | |
1600 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
1601 | */ | |
1602 | ||
6802e340 | 1603 | static int dump_holder(struct seq_file *seq, const struct gfs2_holder *gh) |
b3b94faa | 1604 | { |
6802e340 | 1605 | struct task_struct *gh_owner = NULL; |
6802e340 | 1606 | char flags_buf[32]; |
b3b94faa | 1607 | |
6802e340 | 1608 | if (gh->gh_owner_pid) |
b1e058da | 1609 | gh_owner = pid_task(gh->gh_owner_pid, PIDTYPE_PID); |
cc18152e JP |
1610 | gfs2_print_dbg(seq, " H: s:%s f:%s e:%d p:%ld [%s] %pS\n", |
1611 | state2str(gh->gh_state), | |
1612 | hflags2str(flags_buf, gh->gh_flags, gh->gh_iflags), | |
1613 | gh->gh_error, | |
1614 | gh->gh_owner_pid ? (long)pid_nr(gh->gh_owner_pid) : -1, | |
1615 | gh_owner ? gh_owner->comm : "(ended)", | |
1616 | (void *)gh->gh_ip); | |
7c52b166 | 1617 | return 0; |
b3b94faa DT |
1618 | } |
1619 | ||
627c10b7 | 1620 | static const char *gflags2str(char *buf, const struct gfs2_glock *gl) |
6802e340 | 1621 | { |
627c10b7 | 1622 | const unsigned long *gflags = &gl->gl_flags; |
6802e340 | 1623 | char *p = buf; |
627c10b7 | 1624 | |
6802e340 SW |
1625 | if (test_bit(GLF_LOCK, gflags)) |
1626 | *p++ = 'l'; | |
6802e340 SW |
1627 | if (test_bit(GLF_DEMOTE, gflags)) |
1628 | *p++ = 'D'; | |
1629 | if (test_bit(GLF_PENDING_DEMOTE, gflags)) | |
1630 | *p++ = 'd'; | |
1631 | if (test_bit(GLF_DEMOTE_IN_PROGRESS, gflags)) | |
1632 | *p++ = 'p'; | |
1633 | if (test_bit(GLF_DIRTY, gflags)) | |
1634 | *p++ = 'y'; | |
1635 | if (test_bit(GLF_LFLUSH, gflags)) | |
1636 | *p++ = 'f'; | |
1637 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, gflags)) | |
1638 | *p++ = 'i'; | |
1639 | if (test_bit(GLF_REPLY_PENDING, gflags)) | |
1640 | *p++ = 'r'; | |
f057f6cd | 1641 | if (test_bit(GLF_INITIAL, gflags)) |
d8348de0 | 1642 | *p++ = 'I'; |
f057f6cd SW |
1643 | if (test_bit(GLF_FROZEN, gflags)) |
1644 | *p++ = 'F'; | |
7b5e3d5f SW |
1645 | if (test_bit(GLF_QUEUED, gflags)) |
1646 | *p++ = 'q'; | |
627c10b7 SW |
1647 | if (test_bit(GLF_LRU, gflags)) |
1648 | *p++ = 'L'; | |
1649 | if (gl->gl_object) | |
1650 | *p++ = 'o'; | |
a245769f SW |
1651 | if (test_bit(GLF_BLOCKING, gflags)) |
1652 | *p++ = 'b'; | |
6802e340 SW |
1653 | *p = 0; |
1654 | return buf; | |
b3b94faa DT |
1655 | } |
1656 | ||
1657 | /** | |
6802e340 SW |
1658 | * __dump_glock - print information about a glock |
1659 | * @seq: The seq_file struct | |
b3b94faa | 1660 | * @gl: the glock |
6802e340 SW |
1661 | * |
1662 | * The file format is as follows: | |
1663 | * One line per object, capital letters are used to indicate objects | |
1664 | * G = glock, I = Inode, R = rgrp, H = holder. Glocks are not indented, | |
1665 | * other objects are indented by a single space and follow the glock to | |
1666 | * which they are related. Fields are indicated by lower case letters | |
1667 | * followed by a colon and the field value, except for strings which are in | |
1668 | * [] so that its possible to see if they are composed of spaces for | |
1669 | * example. The field's are n = number (id of the object), f = flags, | |
1670 | * t = type, s = state, r = refcount, e = error, p = pid. | |
b3b94faa DT |
1671 | * |
1672 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
1673 | */ | |
1674 | ||
6802e340 | 1675 | static int __dump_glock(struct seq_file *seq, const struct gfs2_glock *gl) |
b3b94faa | 1676 | { |
6802e340 SW |
1677 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
1678 | unsigned long long dtime; | |
1679 | const struct gfs2_holder *gh; | |
1680 | char gflags_buf[32]; | |
1681 | int error = 0; | |
b3b94faa | 1682 | |
6802e340 SW |
1683 | dtime = jiffies - gl->gl_demote_time; |
1684 | dtime *= 1000000/HZ; /* demote time in uSec */ | |
1685 | if (!test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
1686 | dtime = 0; | |
7cf8dcd3 | 1687 | 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 |
1688 | state2str(gl->gl_state), |
1689 | gl->gl_name.ln_type, | |
1690 | (unsigned long long)gl->gl_name.ln_number, | |
627c10b7 | 1691 | gflags2str(gflags_buf, gl), |
6802e340 SW |
1692 | state2str(gl->gl_target), |
1693 | state2str(gl->gl_demote_state), dtime, | |
6802e340 | 1694 | atomic_read(&gl->gl_ail_count), |
f42ab085 | 1695 | atomic_read(&gl->gl_revokes), |
7cf8dcd3 | 1696 | atomic_read(&gl->gl_ref), gl->gl_hold_time); |
b3b94faa | 1697 | |
b3b94faa | 1698 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { |
6802e340 | 1699 | error = dump_holder(seq, gh); |
b3b94faa DT |
1700 | if (error) |
1701 | goto out; | |
1702 | } | |
6802e340 SW |
1703 | if (gl->gl_state != LM_ST_UNLOCKED && glops->go_dump) |
1704 | error = glops->go_dump(seq, gl); | |
a91ea69f | 1705 | out: |
b3b94faa DT |
1706 | return error; |
1707 | } | |
1708 | ||
a245769f SW |
1709 | static int gfs2_glstats_seq_show(struct seq_file *seq, void *iter_ptr) |
1710 | { | |
1711 | struct gfs2_glock *gl = iter_ptr; | |
1712 | ||
1713 | seq_printf(seq, "G: n:%u/%llx rtt:%lld/%lld rttb:%lld/%lld irt:%lld/%lld dcnt: %lld qcnt: %lld\n", | |
1714 | gl->gl_name.ln_type, | |
1715 | (unsigned long long)gl->gl_name.ln_number, | |
1716 | (long long)gl->gl_stats.stats[GFS2_LKS_SRTT], | |
1717 | (long long)gl->gl_stats.stats[GFS2_LKS_SRTTVAR], | |
1718 | (long long)gl->gl_stats.stats[GFS2_LKS_SRTTB], | |
1719 | (long long)gl->gl_stats.stats[GFS2_LKS_SRTTVARB], | |
1720 | (long long)gl->gl_stats.stats[GFS2_LKS_SIRT], | |
1721 | (long long)gl->gl_stats.stats[GFS2_LKS_SIRTVAR], | |
1722 | (long long)gl->gl_stats.stats[GFS2_LKS_DCOUNT], | |
1723 | (long long)gl->gl_stats.stats[GFS2_LKS_QCOUNT]); | |
1724 | return 0; | |
1725 | } | |
1726 | ||
1727 | static const char *gfs2_gltype[] = { | |
1728 | "type", | |
1729 | "reserved", | |
1730 | "nondisk", | |
1731 | "inode", | |
1732 | "rgrp", | |
1733 | "meta", | |
1734 | "iopen", | |
1735 | "flock", | |
1736 | "plock", | |
1737 | "quota", | |
1738 | "journal", | |
1739 | }; | |
1740 | ||
1741 | static const char *gfs2_stype[] = { | |
1742 | [GFS2_LKS_SRTT] = "srtt", | |
1743 | [GFS2_LKS_SRTTVAR] = "srttvar", | |
1744 | [GFS2_LKS_SRTTB] = "srttb", | |
1745 | [GFS2_LKS_SRTTVARB] = "srttvarb", | |
1746 | [GFS2_LKS_SIRT] = "sirt", | |
1747 | [GFS2_LKS_SIRTVAR] = "sirtvar", | |
1748 | [GFS2_LKS_DCOUNT] = "dlm", | |
1749 | [GFS2_LKS_QCOUNT] = "queue", | |
1750 | }; | |
1751 | ||
1752 | #define GFS2_NR_SBSTATS (ARRAY_SIZE(gfs2_gltype) * ARRAY_SIZE(gfs2_stype)) | |
1753 | ||
1754 | static int gfs2_sbstats_seq_show(struct seq_file *seq, void *iter_ptr) | |
1755 | { | |
1756 | struct gfs2_glock_iter *gi = seq->private; | |
1757 | struct gfs2_sbd *sdp = gi->sdp; | |
1758 | unsigned index = gi->hash >> 3; | |
1759 | unsigned subindex = gi->hash & 0x07; | |
1760 | s64 value; | |
1761 | int i; | |
1762 | ||
1763 | if (index == 0 && subindex != 0) | |
1764 | return 0; | |
6802e340 | 1765 | |
a245769f SW |
1766 | seq_printf(seq, "%-10s %8s:", gfs2_gltype[index], |
1767 | (index == 0) ? "cpu": gfs2_stype[subindex]); | |
b3b94faa | 1768 | |
a245769f SW |
1769 | for_each_possible_cpu(i) { |
1770 | const struct gfs2_pcpu_lkstats *lkstats = per_cpu_ptr(sdp->sd_lkstats, i); | |
1771 | if (index == 0) { | |
1772 | value = i; | |
1773 | } else { | |
1774 | value = lkstats->lkstats[index - 1].stats[subindex]; | |
1775 | } | |
1776 | seq_printf(seq, " %15lld", (long long)value); | |
1777 | } | |
1778 | seq_putc(seq, '\n'); | |
1779 | return 0; | |
1780 | } | |
8fbbfd21 | 1781 | |
85d1da67 SW |
1782 | int __init gfs2_glock_init(void) |
1783 | { | |
1784 | unsigned i; | |
1785 | for(i = 0; i < GFS2_GL_HASH_SIZE; i++) { | |
bc015cb8 | 1786 | INIT_HLIST_BL_HEAD(&gl_hash_table[i]); |
087efdd3 | 1787 | } |
8fbbfd21 | 1788 | |
d2115778 | 1789 | glock_workqueue = alloc_workqueue("glock_workqueue", WQ_MEM_RECLAIM | |
58a69cb4 | 1790 | WQ_HIGHPRI | WQ_FREEZABLE, 0); |
97cc1025 | 1791 | if (IS_ERR(glock_workqueue)) |
c4f68a13 | 1792 | return PTR_ERR(glock_workqueue); |
d2115778 | 1793 | gfs2_delete_workqueue = alloc_workqueue("delete_workqueue", |
58a69cb4 | 1794 | WQ_MEM_RECLAIM | WQ_FREEZABLE, |
d2115778 | 1795 | 0); |
b94a170e BM |
1796 | if (IS_ERR(gfs2_delete_workqueue)) { |
1797 | destroy_workqueue(glock_workqueue); | |
1798 | return PTR_ERR(gfs2_delete_workqueue); | |
1799 | } | |
97cc1025 SW |
1800 | |
1801 | register_shrinker(&glock_shrinker); | |
c4f68a13 | 1802 | |
85d1da67 SW |
1803 | return 0; |
1804 | } | |
1805 | ||
8fbbfd21 SW |
1806 | void gfs2_glock_exit(void) |
1807 | { | |
97cc1025 | 1808 | unregister_shrinker(&glock_shrinker); |
c4f68a13 | 1809 | destroy_workqueue(glock_workqueue); |
b94a170e | 1810 | destroy_workqueue(gfs2_delete_workqueue); |
8fbbfd21 SW |
1811 | } |
1812 | ||
bc015cb8 SW |
1813 | static inline struct gfs2_glock *glock_hash_chain(unsigned hash) |
1814 | { | |
1815 | return hlist_bl_entry(hlist_bl_first_rcu(&gl_hash_table[hash]), | |
1816 | struct gfs2_glock, gl_list); | |
1817 | } | |
1818 | ||
1819 | static inline struct gfs2_glock *glock_hash_next(struct gfs2_glock *gl) | |
1820 | { | |
7e32d026 | 1821 | return hlist_bl_entry(rcu_dereference(gl->gl_list.next), |
bc015cb8 SW |
1822 | struct gfs2_glock, gl_list); |
1823 | } | |
1824 | ||
6802e340 | 1825 | static int gfs2_glock_iter_next(struct gfs2_glock_iter *gi) |
7c52b166 | 1826 | { |
7b08fc62 SW |
1827 | struct gfs2_glock *gl; |
1828 | ||
bc015cb8 SW |
1829 | do { |
1830 | gl = gi->gl; | |
1831 | if (gl) { | |
1832 | gi->gl = glock_hash_next(gl); | |
ba1ddcb6 | 1833 | gi->nhash++; |
bc015cb8 | 1834 | } else { |
ba1ddcb6 SW |
1835 | if (gi->hash >= GFS2_GL_HASH_SIZE) { |
1836 | rcu_read_unlock(); | |
1837 | return 1; | |
1838 | } | |
bc015cb8 | 1839 | gi->gl = glock_hash_chain(gi->hash); |
ba1ddcb6 | 1840 | gi->nhash = 0; |
bc015cb8 SW |
1841 | } |
1842 | while (gi->gl == NULL) { | |
1843 | gi->hash++; | |
1844 | if (gi->hash >= GFS2_GL_HASH_SIZE) { | |
1845 | rcu_read_unlock(); | |
1846 | return 1; | |
1847 | } | |
1848 | gi->gl = glock_hash_chain(gi->hash); | |
ba1ddcb6 | 1849 | gi->nhash = 0; |
bc015cb8 SW |
1850 | } |
1851 | /* Skip entries for other sb and dead entries */ | |
1852 | } while (gi->sdp != gi->gl->gl_sbd || atomic_read(&gi->gl->gl_ref) == 0); | |
a947e033 | 1853 | |
7c52b166 RP |
1854 | return 0; |
1855 | } | |
1856 | ||
6802e340 | 1857 | static void *gfs2_glock_seq_start(struct seq_file *seq, loff_t *pos) |
7c52b166 | 1858 | { |
6802e340 | 1859 | struct gfs2_glock_iter *gi = seq->private; |
7c52b166 RP |
1860 | loff_t n = *pos; |
1861 | ||
ba1ddcb6 SW |
1862 | if (gi->last_pos <= *pos) |
1863 | n = gi->nhash + (*pos - gi->last_pos); | |
1864 | else | |
1865 | gi->hash = 0; | |
1866 | ||
1867 | gi->nhash = 0; | |
bc015cb8 | 1868 | rcu_read_lock(); |
7c52b166 | 1869 | |
6802e340 | 1870 | do { |
bc015cb8 | 1871 | if (gfs2_glock_iter_next(gi)) |
7c52b166 | 1872 | return NULL; |
6802e340 | 1873 | } while (n--); |
7c52b166 | 1874 | |
ba1ddcb6 | 1875 | gi->last_pos = *pos; |
6802e340 | 1876 | return gi->gl; |
7c52b166 RP |
1877 | } |
1878 | ||
6802e340 | 1879 | static void *gfs2_glock_seq_next(struct seq_file *seq, void *iter_ptr, |
7c52b166 RP |
1880 | loff_t *pos) |
1881 | { | |
6802e340 | 1882 | struct gfs2_glock_iter *gi = seq->private; |
7c52b166 RP |
1883 | |
1884 | (*pos)++; | |
ba1ddcb6 | 1885 | gi->last_pos = *pos; |
bc015cb8 | 1886 | if (gfs2_glock_iter_next(gi)) |
7c52b166 | 1887 | return NULL; |
7c52b166 | 1888 | |
6802e340 | 1889 | return gi->gl; |
7c52b166 RP |
1890 | } |
1891 | ||
6802e340 | 1892 | static void gfs2_glock_seq_stop(struct seq_file *seq, void *iter_ptr) |
7c52b166 | 1893 | { |
6802e340 | 1894 | struct gfs2_glock_iter *gi = seq->private; |
bc015cb8 SW |
1895 | |
1896 | if (gi->gl) | |
1897 | rcu_read_unlock(); | |
1898 | gi->gl = NULL; | |
7c52b166 RP |
1899 | } |
1900 | ||
6802e340 | 1901 | static int gfs2_glock_seq_show(struct seq_file *seq, void *iter_ptr) |
7c52b166 | 1902 | { |
6802e340 | 1903 | return dump_glock(seq, iter_ptr); |
7c52b166 RP |
1904 | } |
1905 | ||
a245769f SW |
1906 | static void *gfs2_sbstats_seq_start(struct seq_file *seq, loff_t *pos) |
1907 | { | |
1908 | struct gfs2_glock_iter *gi = seq->private; | |
1909 | ||
1910 | gi->hash = *pos; | |
1911 | if (*pos >= GFS2_NR_SBSTATS) | |
1912 | return NULL; | |
1913 | preempt_disable(); | |
1914 | return SEQ_START_TOKEN; | |
1915 | } | |
1916 | ||
1917 | static void *gfs2_sbstats_seq_next(struct seq_file *seq, void *iter_ptr, | |
1918 | loff_t *pos) | |
1919 | { | |
1920 | struct gfs2_glock_iter *gi = seq->private; | |
1921 | (*pos)++; | |
1922 | gi->hash++; | |
1923 | if (gi->hash >= GFS2_NR_SBSTATS) { | |
1924 | preempt_enable(); | |
1925 | return NULL; | |
1926 | } | |
1927 | return SEQ_START_TOKEN; | |
1928 | } | |
1929 | ||
1930 | static void gfs2_sbstats_seq_stop(struct seq_file *seq, void *iter_ptr) | |
1931 | { | |
1932 | preempt_enable(); | |
1933 | } | |
1934 | ||
4ef29002 | 1935 | static const struct seq_operations gfs2_glock_seq_ops = { |
7c52b166 RP |
1936 | .start = gfs2_glock_seq_start, |
1937 | .next = gfs2_glock_seq_next, | |
1938 | .stop = gfs2_glock_seq_stop, | |
1939 | .show = gfs2_glock_seq_show, | |
1940 | }; | |
1941 | ||
a245769f SW |
1942 | static const struct seq_operations gfs2_glstats_seq_ops = { |
1943 | .start = gfs2_glock_seq_start, | |
1944 | .next = gfs2_glock_seq_next, | |
1945 | .stop = gfs2_glock_seq_stop, | |
1946 | .show = gfs2_glstats_seq_show, | |
1947 | }; | |
1948 | ||
1949 | static const struct seq_operations gfs2_sbstats_seq_ops = { | |
1950 | .start = gfs2_sbstats_seq_start, | |
1951 | .next = gfs2_sbstats_seq_next, | |
1952 | .stop = gfs2_sbstats_seq_stop, | |
1953 | .show = gfs2_sbstats_seq_show, | |
1954 | }; | |
1955 | ||
0fe2f1e9 SW |
1956 | #define GFS2_SEQ_GOODSIZE min(PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER, 65536UL) |
1957 | ||
a245769f | 1958 | static int gfs2_glocks_open(struct inode *inode, struct file *file) |
7c52b166 | 1959 | { |
6802e340 SW |
1960 | int ret = seq_open_private(file, &gfs2_glock_seq_ops, |
1961 | sizeof(struct gfs2_glock_iter)); | |
1962 | if (ret == 0) { | |
1963 | struct seq_file *seq = file->private_data; | |
1964 | struct gfs2_glock_iter *gi = seq->private; | |
1965 | gi->sdp = inode->i_private; | |
0fe2f1e9 | 1966 | seq->buf = kmalloc(GFS2_SEQ_GOODSIZE, GFP_KERNEL | __GFP_NOWARN); |
df5d2f55 | 1967 | if (seq->buf) |
0fe2f1e9 | 1968 | seq->size = GFS2_SEQ_GOODSIZE; |
6802e340 SW |
1969 | } |
1970 | return ret; | |
7c52b166 RP |
1971 | } |
1972 | ||
a245769f SW |
1973 | static int gfs2_glstats_open(struct inode *inode, struct file *file) |
1974 | { | |
1975 | int ret = seq_open_private(file, &gfs2_glstats_seq_ops, | |
1976 | sizeof(struct gfs2_glock_iter)); | |
1977 | if (ret == 0) { | |
1978 | struct seq_file *seq = file->private_data; | |
1979 | struct gfs2_glock_iter *gi = seq->private; | |
1980 | gi->sdp = inode->i_private; | |
0fe2f1e9 | 1981 | seq->buf = kmalloc(GFS2_SEQ_GOODSIZE, GFP_KERNEL | __GFP_NOWARN); |
df5d2f55 | 1982 | if (seq->buf) |
0fe2f1e9 | 1983 | seq->size = GFS2_SEQ_GOODSIZE; |
a245769f SW |
1984 | } |
1985 | return ret; | |
1986 | } | |
1987 | ||
1988 | static int gfs2_sbstats_open(struct inode *inode, struct file *file) | |
1989 | { | |
1990 | int ret = seq_open_private(file, &gfs2_sbstats_seq_ops, | |
1991 | sizeof(struct gfs2_glock_iter)); | |
1992 | if (ret == 0) { | |
1993 | struct seq_file *seq = file->private_data; | |
1994 | struct gfs2_glock_iter *gi = seq->private; | |
1995 | gi->sdp = inode->i_private; | |
1996 | } | |
1997 | return ret; | |
1998 | } | |
1999 | ||
2000 | static const struct file_operations gfs2_glocks_fops = { | |
2001 | .owner = THIS_MODULE, | |
2002 | .open = gfs2_glocks_open, | |
2003 | .read = seq_read, | |
2004 | .llseek = seq_lseek, | |
2005 | .release = seq_release_private, | |
2006 | }; | |
2007 | ||
2008 | static const struct file_operations gfs2_glstats_fops = { | |
7c52b166 | 2009 | .owner = THIS_MODULE, |
a245769f SW |
2010 | .open = gfs2_glstats_open, |
2011 | .read = seq_read, | |
2012 | .llseek = seq_lseek, | |
2013 | .release = seq_release_private, | |
2014 | }; | |
2015 | ||
2016 | static const struct file_operations gfs2_sbstats_fops = { | |
2017 | .owner = THIS_MODULE, | |
2018 | .open = gfs2_sbstats_open, | |
7c52b166 RP |
2019 | .read = seq_read, |
2020 | .llseek = seq_lseek, | |
6802e340 | 2021 | .release = seq_release_private, |
7c52b166 RP |
2022 | }; |
2023 | ||
2024 | int gfs2_create_debugfs_file(struct gfs2_sbd *sdp) | |
2025 | { | |
5f882096 RP |
2026 | sdp->debugfs_dir = debugfs_create_dir(sdp->sd_table_name, gfs2_root); |
2027 | if (!sdp->debugfs_dir) | |
2028 | return -ENOMEM; | |
2029 | sdp->debugfs_dentry_glocks = debugfs_create_file("glocks", | |
2030 | S_IFREG | S_IRUGO, | |
2031 | sdp->debugfs_dir, sdp, | |
a245769f | 2032 | &gfs2_glocks_fops); |
5f882096 | 2033 | if (!sdp->debugfs_dentry_glocks) |
a245769f SW |
2034 | goto fail; |
2035 | ||
2036 | sdp->debugfs_dentry_glstats = debugfs_create_file("glstats", | |
2037 | S_IFREG | S_IRUGO, | |
2038 | sdp->debugfs_dir, sdp, | |
2039 | &gfs2_glstats_fops); | |
2040 | if (!sdp->debugfs_dentry_glstats) | |
2041 | goto fail; | |
2042 | ||
2043 | sdp->debugfs_dentry_sbstats = debugfs_create_file("sbstats", | |
2044 | S_IFREG | S_IRUGO, | |
2045 | sdp->debugfs_dir, sdp, | |
2046 | &gfs2_sbstats_fops); | |
2047 | if (!sdp->debugfs_dentry_sbstats) | |
2048 | goto fail; | |
7c52b166 RP |
2049 | |
2050 | return 0; | |
a245769f SW |
2051 | fail: |
2052 | gfs2_delete_debugfs_file(sdp); | |
2053 | return -ENOMEM; | |
7c52b166 RP |
2054 | } |
2055 | ||
2056 | void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp) | |
2057 | { | |
a245769f | 2058 | if (sdp->debugfs_dir) { |
5f882096 RP |
2059 | if (sdp->debugfs_dentry_glocks) { |
2060 | debugfs_remove(sdp->debugfs_dentry_glocks); | |
2061 | sdp->debugfs_dentry_glocks = NULL; | |
2062 | } | |
a245769f SW |
2063 | if (sdp->debugfs_dentry_glstats) { |
2064 | debugfs_remove(sdp->debugfs_dentry_glstats); | |
2065 | sdp->debugfs_dentry_glstats = NULL; | |
2066 | } | |
2067 | if (sdp->debugfs_dentry_sbstats) { | |
2068 | debugfs_remove(sdp->debugfs_dentry_sbstats); | |
2069 | sdp->debugfs_dentry_sbstats = NULL; | |
2070 | } | |
5f882096 RP |
2071 | debugfs_remove(sdp->debugfs_dir); |
2072 | sdp->debugfs_dir = NULL; | |
2073 | } | |
7c52b166 RP |
2074 | } |
2075 | ||
2076 | int gfs2_register_debugfs(void) | |
2077 | { | |
2078 | gfs2_root = debugfs_create_dir("gfs2", NULL); | |
2079 | return gfs2_root ? 0 : -ENOMEM; | |
2080 | } | |
2081 | ||
2082 | void gfs2_unregister_debugfs(void) | |
2083 | { | |
2084 | debugfs_remove(gfs2_root); | |
5f882096 | 2085 | gfs2_root = NULL; |
7c52b166 | 2086 | } |