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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 */ | |
54 | char string[512]; /* scratch space */ | |
7c52b166 RP |
55 | }; |
56 | ||
b3b94faa DT |
57 | typedef void (*glock_examiner) (struct gfs2_glock * gl); |
58 | ||
6802e340 SW |
59 | static int __dump_glock(struct seq_file *seq, const struct gfs2_glock *gl); |
60 | #define GLOCK_BUG_ON(gl,x) do { if (unlikely(x)) { __dump_glock(NULL, gl); BUG(); } } while(0) | |
61 | static void do_xmote(struct gfs2_glock *gl, struct gfs2_holder *gh, unsigned int target); | |
c4f68a13 | 62 | |
7c52b166 | 63 | static struct dentry *gfs2_root; |
c4f68a13 | 64 | static struct workqueue_struct *glock_workqueue; |
b94a170e | 65 | struct workqueue_struct *gfs2_delete_workqueue; |
97cc1025 SW |
66 | static LIST_HEAD(lru_list); |
67 | static atomic_t lru_count = ATOMIC_INIT(0); | |
eb8374e7 | 68 | static DEFINE_SPINLOCK(lru_lock); |
08bc2dbc | 69 | |
b6397893 | 70 | #define GFS2_GL_HASH_SHIFT 15 |
087efdd3 SW |
71 | #define GFS2_GL_HASH_SIZE (1 << GFS2_GL_HASH_SHIFT) |
72 | #define GFS2_GL_HASH_MASK (GFS2_GL_HASH_SIZE - 1) | |
73 | ||
bc015cb8 | 74 | static struct hlist_bl_head gl_hash_table[GFS2_GL_HASH_SIZE]; |
04b933f2 | 75 | static struct dentry *gfs2_root; |
087efdd3 | 76 | |
b3b94faa DT |
77 | /** |
78 | * gl_hash() - Turn glock number into hash bucket number | |
79 | * @lock: The glock number | |
80 | * | |
81 | * Returns: The number of the corresponding hash bucket | |
82 | */ | |
83 | ||
b8547856 SW |
84 | static unsigned int gl_hash(const struct gfs2_sbd *sdp, |
85 | const struct lm_lockname *name) | |
b3b94faa DT |
86 | { |
87 | unsigned int h; | |
88 | ||
cd915493 | 89 | h = jhash(&name->ln_number, sizeof(u64), 0); |
b3b94faa | 90 | h = jhash(&name->ln_type, sizeof(unsigned int), h); |
b8547856 | 91 | h = jhash(&sdp, sizeof(struct gfs2_sbd *), h); |
b3b94faa DT |
92 | h &= GFS2_GL_HASH_MASK; |
93 | ||
94 | return h; | |
95 | } | |
96 | ||
bc015cb8 SW |
97 | static inline void spin_lock_bucket(unsigned int hash) |
98 | { | |
1879fd6a | 99 | hlist_bl_lock(&gl_hash_table[hash]); |
bc015cb8 | 100 | } |
b3b94faa | 101 | |
bc015cb8 SW |
102 | static inline void spin_unlock_bucket(unsigned int hash) |
103 | { | |
1879fd6a | 104 | hlist_bl_unlock(&gl_hash_table[hash]); |
bc015cb8 | 105 | } |
b3b94faa | 106 | |
fc0e38da | 107 | static void gfs2_glock_dealloc(struct rcu_head *rcu) |
b3b94faa | 108 | { |
bc015cb8 | 109 | struct gfs2_glock *gl = container_of(rcu, struct gfs2_glock, gl_rcu); |
b3b94faa | 110 | |
bc015cb8 SW |
111 | if (gl->gl_ops->go_flags & GLOF_ASPACE) |
112 | kmem_cache_free(gfs2_glock_aspace_cachep, gl); | |
113 | else | |
114 | kmem_cache_free(gfs2_glock_cachep, gl); | |
fc0e38da SW |
115 | } |
116 | ||
117 | void gfs2_glock_free(struct gfs2_glock *gl) | |
b3b94faa DT |
118 | { |
119 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
b3b94faa | 120 | |
fc0e38da | 121 | call_rcu(&gl->gl_rcu, gfs2_glock_dealloc); |
bc015cb8 SW |
122 | if (atomic_dec_and_test(&sdp->sd_glock_disposal)) |
123 | wake_up(&sdp->sd_glock_wait); | |
b3b94faa DT |
124 | } |
125 | ||
126 | /** | |
127 | * gfs2_glock_hold() - increment reference count on glock | |
128 | * @gl: The glock to hold | |
129 | * | |
130 | */ | |
131 | ||
b94a170e | 132 | void gfs2_glock_hold(struct gfs2_glock *gl) |
b3b94faa | 133 | { |
d8348de0 | 134 | GLOCK_BUG_ON(gl, atomic_read(&gl->gl_ref) == 0); |
16feb9fe | 135 | atomic_inc(&gl->gl_ref); |
b3b94faa DT |
136 | } |
137 | ||
8ff22a6f BM |
138 | /** |
139 | * demote_ok - Check to see if it's ok to unlock a glock | |
140 | * @gl: the glock | |
141 | * | |
142 | * Returns: 1 if it's ok | |
143 | */ | |
144 | ||
145 | static int demote_ok(const struct gfs2_glock *gl) | |
146 | { | |
147 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
148 | ||
149 | if (gl->gl_state == LM_ST_UNLOCKED) | |
150 | return 0; | |
f42ab085 | 151 | if (!list_empty(&gl->gl_holders)) |
8ff22a6f BM |
152 | return 0; |
153 | if (glops->go_demote_ok) | |
154 | return glops->go_demote_ok(gl); | |
155 | return 1; | |
156 | } | |
157 | ||
bc015cb8 | 158 | |
29687a2a SW |
159 | void gfs2_glock_add_to_lru(struct gfs2_glock *gl) |
160 | { | |
161 | spin_lock(&lru_lock); | |
162 | ||
163 | if (!list_empty(&gl->gl_lru)) | |
164 | list_del_init(&gl->gl_lru); | |
165 | else | |
166 | atomic_inc(&lru_count); | |
167 | ||
168 | list_add_tail(&gl->gl_lru, &lru_list); | |
627c10b7 | 169 | set_bit(GLF_LRU, &gl->gl_flags); |
29687a2a SW |
170 | spin_unlock(&lru_lock); |
171 | } | |
172 | ||
4043b886 | 173 | static void __gfs2_glock_remove_from_lru(struct gfs2_glock *gl) |
f42ab085 | 174 | { |
f42ab085 SW |
175 | if (!list_empty(&gl->gl_lru)) { |
176 | list_del_init(&gl->gl_lru); | |
177 | atomic_dec(&lru_count); | |
178 | clear_bit(GLF_LRU, &gl->gl_flags); | |
179 | } | |
4043b886 SW |
180 | } |
181 | ||
182 | static void gfs2_glock_remove_from_lru(struct gfs2_glock *gl) | |
183 | { | |
184 | spin_lock(&lru_lock); | |
185 | __gfs2_glock_remove_from_lru(gl); | |
f42ab085 SW |
186 | spin_unlock(&lru_lock); |
187 | } | |
188 | ||
97cc1025 | 189 | /** |
bc015cb8 | 190 | * __gfs2_glock_schedule_for_reclaim - Add a glock to the reclaim list |
97cc1025 SW |
191 | * @gl: the glock |
192 | * | |
bc015cb8 SW |
193 | * If the glock is demotable, then we add it (or move it) to the end |
194 | * of the glock LRU list. | |
97cc1025 SW |
195 | */ |
196 | ||
bc015cb8 | 197 | static void __gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl) |
97cc1025 | 198 | { |
29687a2a SW |
199 | if (demote_ok(gl)) |
200 | gfs2_glock_add_to_lru(gl); | |
97cc1025 SW |
201 | } |
202 | ||
8ff22a6f BM |
203 | /** |
204 | * gfs2_glock_put_nolock() - Decrement reference count on glock | |
205 | * @gl: The glock to put | |
206 | * | |
207 | * This function should only be used if the caller has its own reference | |
208 | * to the glock, in addition to the one it is dropping. | |
209 | */ | |
210 | ||
b94a170e | 211 | void gfs2_glock_put_nolock(struct gfs2_glock *gl) |
8ff22a6f BM |
212 | { |
213 | if (atomic_dec_and_test(&gl->gl_ref)) | |
214 | GLOCK_BUG_ON(gl, 1); | |
8ff22a6f BM |
215 | } |
216 | ||
b3b94faa DT |
217 | /** |
218 | * gfs2_glock_put() - Decrement reference count on glock | |
219 | * @gl: The glock to put | |
220 | * | |
221 | */ | |
222 | ||
bc015cb8 | 223 | void gfs2_glock_put(struct gfs2_glock *gl) |
b3b94faa | 224 | { |
bc015cb8 SW |
225 | struct gfs2_sbd *sdp = gl->gl_sbd; |
226 | struct address_space *mapping = gfs2_glock2aspace(gl); | |
b3b94faa | 227 | |
4043b886 SW |
228 | if (atomic_dec_and_lock(&gl->gl_ref, &lru_lock)) { |
229 | __gfs2_glock_remove_from_lru(gl); | |
230 | spin_unlock(&lru_lock); | |
bc015cb8 SW |
231 | spin_lock_bucket(gl->gl_hash); |
232 | hlist_bl_del_rcu(&gl->gl_list); | |
233 | spin_unlock_bucket(gl->gl_hash); | |
6802e340 | 234 | GLOCK_BUG_ON(gl, !list_empty(&gl->gl_holders)); |
bc015cb8 SW |
235 | GLOCK_BUG_ON(gl, mapping && mapping->nrpages); |
236 | trace_gfs2_glock_put(gl); | |
237 | sdp->sd_lockstruct.ls_ops->lm_put_lock(gl); | |
b3b94faa | 238 | } |
b3b94faa DT |
239 | } |
240 | ||
b3b94faa DT |
241 | /** |
242 | * search_bucket() - Find struct gfs2_glock by lock number | |
243 | * @bucket: the bucket to search | |
244 | * @name: The lock name | |
245 | * | |
246 | * Returns: NULL, or the struct gfs2_glock with the requested number | |
247 | */ | |
248 | ||
37b2fa6a | 249 | static struct gfs2_glock *search_bucket(unsigned int hash, |
899be4d3 | 250 | const struct gfs2_sbd *sdp, |
d6a53727 | 251 | const struct lm_lockname *name) |
b3b94faa DT |
252 | { |
253 | struct gfs2_glock *gl; | |
bc015cb8 | 254 | struct hlist_bl_node *h; |
b3b94faa | 255 | |
bc015cb8 | 256 | hlist_bl_for_each_entry_rcu(gl, h, &gl_hash_table[hash], gl_list) { |
b3b94faa DT |
257 | if (!lm_name_equal(&gl->gl_name, name)) |
258 | continue; | |
899be4d3 SW |
259 | if (gl->gl_sbd != sdp) |
260 | continue; | |
bc015cb8 SW |
261 | if (atomic_inc_not_zero(&gl->gl_ref)) |
262 | return gl; | |
b3b94faa DT |
263 | } |
264 | ||
265 | return NULL; | |
266 | } | |
267 | ||
6802e340 SW |
268 | /** |
269 | * may_grant - check if its ok to grant a new lock | |
270 | * @gl: The glock | |
271 | * @gh: The lock request which we wish to grant | |
272 | * | |
273 | * Returns: true if its ok to grant the lock | |
274 | */ | |
275 | ||
276 | static inline int may_grant(const struct gfs2_glock *gl, const struct gfs2_holder *gh) | |
277 | { | |
278 | const struct gfs2_holder *gh_head = list_entry(gl->gl_holders.next, const struct gfs2_holder, gh_list); | |
279 | if ((gh->gh_state == LM_ST_EXCLUSIVE || | |
280 | gh_head->gh_state == LM_ST_EXCLUSIVE) && gh != gh_head) | |
281 | return 0; | |
282 | if (gl->gl_state == gh->gh_state) | |
283 | return 1; | |
284 | if (gh->gh_flags & GL_EXACT) | |
285 | return 0; | |
209806ab SW |
286 | if (gl->gl_state == LM_ST_EXCLUSIVE) { |
287 | if (gh->gh_state == LM_ST_SHARED && gh_head->gh_state == LM_ST_SHARED) | |
288 | return 1; | |
289 | if (gh->gh_state == LM_ST_DEFERRED && gh_head->gh_state == LM_ST_DEFERRED) | |
290 | return 1; | |
291 | } | |
6802e340 SW |
292 | if (gl->gl_state != LM_ST_UNLOCKED && (gh->gh_flags & LM_FLAG_ANY)) |
293 | return 1; | |
294 | return 0; | |
295 | } | |
296 | ||
297 | static void gfs2_holder_wake(struct gfs2_holder *gh) | |
298 | { | |
299 | clear_bit(HIF_WAIT, &gh->gh_iflags); | |
300 | smp_mb__after_clear_bit(); | |
301 | wake_up_bit(&gh->gh_iflags, HIF_WAIT); | |
302 | } | |
303 | ||
d5341a92 SW |
304 | /** |
305 | * do_error - Something unexpected has happened during a lock request | |
306 | * | |
307 | */ | |
308 | ||
309 | static inline void do_error(struct gfs2_glock *gl, const int ret) | |
310 | { | |
311 | struct gfs2_holder *gh, *tmp; | |
312 | ||
313 | list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) { | |
314 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
315 | continue; | |
316 | if (ret & LM_OUT_ERROR) | |
317 | gh->gh_error = -EIO; | |
318 | else if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) | |
319 | gh->gh_error = GLR_TRYFAILED; | |
320 | else | |
321 | continue; | |
322 | list_del_init(&gh->gh_list); | |
323 | trace_gfs2_glock_queue(gh, 0); | |
324 | gfs2_holder_wake(gh); | |
325 | } | |
326 | } | |
327 | ||
6802e340 SW |
328 | /** |
329 | * do_promote - promote as many requests as possible on the current queue | |
330 | * @gl: The glock | |
331 | * | |
813e0c46 SW |
332 | * Returns: 1 if there is a blocked holder at the head of the list, or 2 |
333 | * if a type specific operation is underway. | |
6802e340 SW |
334 | */ |
335 | ||
336 | static int do_promote(struct gfs2_glock *gl) | |
55ba474d HH |
337 | __releases(&gl->gl_spin) |
338 | __acquires(&gl->gl_spin) | |
6802e340 SW |
339 | { |
340 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
341 | struct gfs2_holder *gh, *tmp; | |
342 | int ret; | |
343 | ||
344 | restart: | |
345 | list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) { | |
346 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
347 | continue; | |
348 | if (may_grant(gl, gh)) { | |
349 | if (gh->gh_list.prev == &gl->gl_holders && | |
350 | glops->go_lock) { | |
351 | spin_unlock(&gl->gl_spin); | |
352 | /* FIXME: eliminate this eventually */ | |
353 | ret = glops->go_lock(gh); | |
354 | spin_lock(&gl->gl_spin); | |
355 | if (ret) { | |
813e0c46 SW |
356 | if (ret == 1) |
357 | return 2; | |
6802e340 SW |
358 | gh->gh_error = ret; |
359 | list_del_init(&gh->gh_list); | |
63997775 | 360 | trace_gfs2_glock_queue(gh, 0); |
6802e340 SW |
361 | gfs2_holder_wake(gh); |
362 | goto restart; | |
363 | } | |
364 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
63997775 | 365 | trace_gfs2_promote(gh, 1); |
6802e340 SW |
366 | gfs2_holder_wake(gh); |
367 | goto restart; | |
368 | } | |
369 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
63997775 | 370 | trace_gfs2_promote(gh, 0); |
6802e340 SW |
371 | gfs2_holder_wake(gh); |
372 | continue; | |
373 | } | |
374 | if (gh->gh_list.prev == &gl->gl_holders) | |
375 | return 1; | |
d5341a92 | 376 | do_error(gl, 0); |
6802e340 SW |
377 | break; |
378 | } | |
379 | return 0; | |
380 | } | |
381 | ||
6802e340 SW |
382 | /** |
383 | * find_first_waiter - find the first gh that's waiting for the glock | |
384 | * @gl: the glock | |
385 | */ | |
386 | ||
387 | static inline struct gfs2_holder *find_first_waiter(const struct gfs2_glock *gl) | |
388 | { | |
389 | struct gfs2_holder *gh; | |
390 | ||
391 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
392 | if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
393 | return gh; | |
394 | } | |
395 | return NULL; | |
396 | } | |
397 | ||
398 | /** | |
399 | * state_change - record that the glock is now in a different state | |
400 | * @gl: the glock | |
401 | * @new_state the new state | |
402 | * | |
403 | */ | |
404 | ||
405 | static void state_change(struct gfs2_glock *gl, unsigned int new_state) | |
406 | { | |
407 | int held1, held2; | |
408 | ||
409 | held1 = (gl->gl_state != LM_ST_UNLOCKED); | |
410 | held2 = (new_state != LM_ST_UNLOCKED); | |
411 | ||
412 | if (held1 != held2) { | |
413 | if (held2) | |
414 | gfs2_glock_hold(gl); | |
415 | else | |
8ff22a6f | 416 | gfs2_glock_put_nolock(gl); |
6802e340 | 417 | } |
7b5e3d5f SW |
418 | if (held1 && held2 && list_empty(&gl->gl_holders)) |
419 | clear_bit(GLF_QUEUED, &gl->gl_flags); | |
6802e340 | 420 | |
7cf8dcd3 BP |
421 | if (new_state != gl->gl_target) |
422 | /* shorten our minimum hold time */ | |
423 | gl->gl_hold_time = max(gl->gl_hold_time - GL_GLOCK_HOLD_DECR, | |
424 | GL_GLOCK_MIN_HOLD); | |
6802e340 SW |
425 | gl->gl_state = new_state; |
426 | gl->gl_tchange = jiffies; | |
427 | } | |
428 | ||
429 | static void gfs2_demote_wake(struct gfs2_glock *gl) | |
430 | { | |
431 | gl->gl_demote_state = LM_ST_EXCLUSIVE; | |
432 | clear_bit(GLF_DEMOTE, &gl->gl_flags); | |
433 | smp_mb__after_clear_bit(); | |
434 | wake_up_bit(&gl->gl_flags, GLF_DEMOTE); | |
435 | } | |
436 | ||
437 | /** | |
438 | * finish_xmote - The DLM has replied to one of our lock requests | |
439 | * @gl: The glock | |
440 | * @ret: The status from the DLM | |
441 | * | |
442 | */ | |
443 | ||
444 | static void finish_xmote(struct gfs2_glock *gl, unsigned int ret) | |
445 | { | |
446 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
447 | struct gfs2_holder *gh; | |
448 | unsigned state = ret & LM_OUT_ST_MASK; | |
813e0c46 | 449 | int rv; |
6802e340 SW |
450 | |
451 | spin_lock(&gl->gl_spin); | |
63997775 | 452 | trace_gfs2_glock_state_change(gl, state); |
6802e340 SW |
453 | state_change(gl, state); |
454 | gh = find_first_waiter(gl); | |
455 | ||
456 | /* Demote to UN request arrived during demote to SH or DF */ | |
457 | if (test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags) && | |
458 | state != LM_ST_UNLOCKED && gl->gl_demote_state == LM_ST_UNLOCKED) | |
459 | gl->gl_target = LM_ST_UNLOCKED; | |
460 | ||
461 | /* Check for state != intended state */ | |
462 | if (unlikely(state != gl->gl_target)) { | |
463 | if (gh && !test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)) { | |
464 | /* move to back of queue and try next entry */ | |
465 | if (ret & LM_OUT_CANCELED) { | |
466 | if ((gh->gh_flags & LM_FLAG_PRIORITY) == 0) | |
467 | list_move_tail(&gh->gh_list, &gl->gl_holders); | |
468 | gh = find_first_waiter(gl); | |
469 | gl->gl_target = gh->gh_state; | |
470 | goto retry; | |
471 | } | |
472 | /* Some error or failed "try lock" - report it */ | |
473 | if ((ret & LM_OUT_ERROR) || | |
474 | (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) { | |
475 | gl->gl_target = gl->gl_state; | |
476 | do_error(gl, ret); | |
477 | goto out; | |
478 | } | |
479 | } | |
480 | switch(state) { | |
481 | /* Unlocked due to conversion deadlock, try again */ | |
482 | case LM_ST_UNLOCKED: | |
483 | retry: | |
484 | do_xmote(gl, gh, gl->gl_target); | |
485 | break; | |
486 | /* Conversion fails, unlock and try again */ | |
487 | case LM_ST_SHARED: | |
488 | case LM_ST_DEFERRED: | |
489 | do_xmote(gl, gh, LM_ST_UNLOCKED); | |
490 | break; | |
491 | default: /* Everything else */ | |
492 | printk(KERN_ERR "GFS2: wanted %u got %u\n", gl->gl_target, state); | |
493 | GLOCK_BUG_ON(gl, 1); | |
494 | } | |
495 | spin_unlock(&gl->gl_spin); | |
6802e340 SW |
496 | return; |
497 | } | |
498 | ||
499 | /* Fast path - we got what we asked for */ | |
500 | if (test_and_clear_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)) | |
501 | gfs2_demote_wake(gl); | |
502 | if (state != LM_ST_UNLOCKED) { | |
503 | if (glops->go_xmote_bh) { | |
6802e340 SW |
504 | spin_unlock(&gl->gl_spin); |
505 | rv = glops->go_xmote_bh(gl, gh); | |
6802e340 SW |
506 | spin_lock(&gl->gl_spin); |
507 | if (rv) { | |
508 | do_error(gl, rv); | |
509 | goto out; | |
510 | } | |
511 | } | |
813e0c46 SW |
512 | rv = do_promote(gl); |
513 | if (rv == 2) | |
514 | goto out_locked; | |
6802e340 SW |
515 | } |
516 | out: | |
517 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
813e0c46 | 518 | out_locked: |
6802e340 | 519 | spin_unlock(&gl->gl_spin); |
6802e340 SW |
520 | } |
521 | ||
6802e340 SW |
522 | /** |
523 | * do_xmote - Calls the DLM to change the state of a lock | |
524 | * @gl: The lock state | |
525 | * @gh: The holder (only for promotes) | |
526 | * @target: The target lock state | |
527 | * | |
528 | */ | |
529 | ||
530 | static void do_xmote(struct gfs2_glock *gl, struct gfs2_holder *gh, unsigned int target) | |
55ba474d HH |
531 | __releases(&gl->gl_spin) |
532 | __acquires(&gl->gl_spin) | |
6802e340 SW |
533 | { |
534 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
535 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
536 | unsigned int lck_flags = gh ? gh->gh_flags : 0; | |
537 | int ret; | |
538 | ||
539 | lck_flags &= (LM_FLAG_TRY | LM_FLAG_TRY_1CB | LM_FLAG_NOEXP | | |
540 | LM_FLAG_PRIORITY); | |
921169ca SW |
541 | GLOCK_BUG_ON(gl, gl->gl_state == target); |
542 | GLOCK_BUG_ON(gl, gl->gl_state == gl->gl_target); | |
6802e340 SW |
543 | if ((target == LM_ST_UNLOCKED || target == LM_ST_DEFERRED) && |
544 | glops->go_inval) { | |
545 | set_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags); | |
546 | do_error(gl, 0); /* Fail queued try locks */ | |
547 | } | |
47a25380 | 548 | gl->gl_req = target; |
a245769f SW |
549 | set_bit(GLF_BLOCKING, &gl->gl_flags); |
550 | if ((gl->gl_req == LM_ST_UNLOCKED) || | |
551 | (gl->gl_state == LM_ST_EXCLUSIVE) || | |
552 | (lck_flags & (LM_FLAG_TRY|LM_FLAG_TRY_1CB))) | |
553 | clear_bit(GLF_BLOCKING, &gl->gl_flags); | |
6802e340 SW |
554 | spin_unlock(&gl->gl_spin); |
555 | if (glops->go_xmote_th) | |
556 | glops->go_xmote_th(gl); | |
557 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags)) | |
558 | glops->go_inval(gl, target == LM_ST_DEFERRED ? 0 : DIO_METADATA); | |
559 | clear_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags); | |
560 | ||
561 | gfs2_glock_hold(gl); | |
921169ca SW |
562 | if (sdp->sd_lockstruct.ls_ops->lm_lock) { |
563 | /* lock_dlm */ | |
564 | ret = sdp->sd_lockstruct.ls_ops->lm_lock(gl, target, lck_flags); | |
565 | GLOCK_BUG_ON(gl, ret); | |
566 | } else { /* lock_nolock */ | |
567 | finish_xmote(gl, target); | |
6802e340 SW |
568 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
569 | gfs2_glock_put(gl); | |
6802e340 | 570 | } |
921169ca | 571 | |
6802e340 SW |
572 | spin_lock(&gl->gl_spin); |
573 | } | |
574 | ||
575 | /** | |
576 | * find_first_holder - find the first "holder" gh | |
577 | * @gl: the glock | |
578 | */ | |
579 | ||
580 | static inline struct gfs2_holder *find_first_holder(const struct gfs2_glock *gl) | |
581 | { | |
582 | struct gfs2_holder *gh; | |
583 | ||
584 | if (!list_empty(&gl->gl_holders)) { | |
585 | gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list); | |
586 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
587 | return gh; | |
588 | } | |
589 | return NULL; | |
590 | } | |
591 | ||
592 | /** | |
593 | * run_queue - do all outstanding tasks related to a glock | |
594 | * @gl: The glock in question | |
595 | * @nonblock: True if we must not block in run_queue | |
596 | * | |
597 | */ | |
598 | ||
599 | static void run_queue(struct gfs2_glock *gl, const int nonblock) | |
55ba474d HH |
600 | __releases(&gl->gl_spin) |
601 | __acquires(&gl->gl_spin) | |
6802e340 SW |
602 | { |
603 | struct gfs2_holder *gh = NULL; | |
813e0c46 | 604 | int ret; |
6802e340 SW |
605 | |
606 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) | |
607 | return; | |
608 | ||
609 | GLOCK_BUG_ON(gl, test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)); | |
610 | ||
611 | if (test_bit(GLF_DEMOTE, &gl->gl_flags) && | |
612 | gl->gl_demote_state != gl->gl_state) { | |
613 | if (find_first_holder(gl)) | |
d8348de0 | 614 | goto out_unlock; |
6802e340 SW |
615 | if (nonblock) |
616 | goto out_sched; | |
617 | set_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags); | |
265d529c | 618 | GLOCK_BUG_ON(gl, gl->gl_demote_state == LM_ST_EXCLUSIVE); |
6802e340 SW |
619 | gl->gl_target = gl->gl_demote_state; |
620 | } else { | |
621 | if (test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
622 | gfs2_demote_wake(gl); | |
813e0c46 SW |
623 | ret = do_promote(gl); |
624 | if (ret == 0) | |
d8348de0 | 625 | goto out_unlock; |
813e0c46 | 626 | if (ret == 2) |
a228df63 | 627 | goto out; |
6802e340 SW |
628 | gh = find_first_waiter(gl); |
629 | gl->gl_target = gh->gh_state; | |
630 | if (!(gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) | |
631 | do_error(gl, 0); /* Fail queued try locks */ | |
632 | } | |
633 | do_xmote(gl, gh, gl->gl_target); | |
a228df63 | 634 | out: |
6802e340 SW |
635 | return; |
636 | ||
637 | out_sched: | |
7e71c55e SW |
638 | clear_bit(GLF_LOCK, &gl->gl_flags); |
639 | smp_mb__after_clear_bit(); | |
6802e340 SW |
640 | gfs2_glock_hold(gl); |
641 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) | |
8ff22a6f | 642 | gfs2_glock_put_nolock(gl); |
7e71c55e SW |
643 | return; |
644 | ||
d8348de0 | 645 | out_unlock: |
6802e340 | 646 | clear_bit(GLF_LOCK, &gl->gl_flags); |
7e71c55e SW |
647 | smp_mb__after_clear_bit(); |
648 | return; | |
6802e340 SW |
649 | } |
650 | ||
b94a170e BM |
651 | static void delete_work_func(struct work_struct *work) |
652 | { | |
653 | struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_delete); | |
654 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
044b9414 | 655 | struct gfs2_inode *ip; |
b94a170e | 656 | struct inode *inode; |
044b9414 SW |
657 | u64 no_addr = gl->gl_name.ln_number; |
658 | ||
659 | ip = gl->gl_object; | |
660 | /* Note: Unsafe to dereference ip as we don't hold right refs/locks */ | |
b94a170e | 661 | |
b94a170e | 662 | if (ip) |
4667a0ec | 663 | inode = gfs2_ilookup(sdp->sd_vfs, no_addr, 1); |
044b9414 SW |
664 | else |
665 | inode = gfs2_lookup_by_inum(sdp, no_addr, NULL, GFS2_BLKST_UNLINKED); | |
666 | if (inode && !IS_ERR(inode)) { | |
667 | d_prune_aliases(inode); | |
668 | iput(inode); | |
b94a170e BM |
669 | } |
670 | gfs2_glock_put(gl); | |
671 | } | |
672 | ||
c4f68a13 BM |
673 | static void glock_work_func(struct work_struct *work) |
674 | { | |
6802e340 | 675 | unsigned long delay = 0; |
c4f68a13 | 676 | struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_work.work); |
26bb7505 | 677 | int drop_ref = 0; |
c4f68a13 | 678 | |
26bb7505 | 679 | if (test_and_clear_bit(GLF_REPLY_PENDING, &gl->gl_flags)) { |
6802e340 | 680 | finish_xmote(gl, gl->gl_reply); |
26bb7505 SW |
681 | drop_ref = 1; |
682 | } | |
c4f68a13 | 683 | spin_lock(&gl->gl_spin); |
f90e5b5b | 684 | if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && |
265d529c SW |
685 | gl->gl_state != LM_ST_UNLOCKED && |
686 | gl->gl_demote_state != LM_ST_EXCLUSIVE) { | |
6802e340 | 687 | unsigned long holdtime, now = jiffies; |
f90e5b5b | 688 | |
7cf8dcd3 | 689 | holdtime = gl->gl_tchange + gl->gl_hold_time; |
6802e340 SW |
690 | if (time_before(now, holdtime)) |
691 | delay = holdtime - now; | |
f90e5b5b BP |
692 | |
693 | if (!delay) { | |
694 | clear_bit(GLF_PENDING_DEMOTE, &gl->gl_flags); | |
695 | set_bit(GLF_DEMOTE, &gl->gl_flags); | |
696 | } | |
6802e340 SW |
697 | } |
698 | run_queue(gl, 0); | |
c4f68a13 | 699 | spin_unlock(&gl->gl_spin); |
7cf8dcd3 | 700 | if (!delay) |
6802e340 | 701 | gfs2_glock_put(gl); |
7cf8dcd3 BP |
702 | else { |
703 | if (gl->gl_name.ln_type != LM_TYPE_INODE) | |
704 | delay = 0; | |
705 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0) | |
706 | gfs2_glock_put(gl); | |
707 | } | |
26bb7505 SW |
708 | if (drop_ref) |
709 | gfs2_glock_put(gl); | |
c4f68a13 BM |
710 | } |
711 | ||
b3b94faa DT |
712 | /** |
713 | * gfs2_glock_get() - Get a glock, or create one if one doesn't exist | |
714 | * @sdp: The GFS2 superblock | |
715 | * @number: the lock number | |
716 | * @glops: The glock_operations to use | |
717 | * @create: If 0, don't create the glock if it doesn't exist | |
718 | * @glp: the glock is returned here | |
719 | * | |
720 | * This does not lock a glock, just finds/creates structures for one. | |
721 | * | |
722 | * Returns: errno | |
723 | */ | |
724 | ||
cd915493 | 725 | int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 | 726 | const struct gfs2_glock_operations *glops, int create, |
b3b94faa DT |
727 | struct gfs2_glock **glp) |
728 | { | |
009d8518 | 729 | struct super_block *s = sdp->sd_vfs; |
37b2fa6a | 730 | struct lm_lockname name = { .ln_number = number, .ln_type = glops->go_type }; |
b3b94faa | 731 | struct gfs2_glock *gl, *tmp; |
37b2fa6a | 732 | unsigned int hash = gl_hash(sdp, &name); |
009d8518 | 733 | struct address_space *mapping; |
bc015cb8 | 734 | struct kmem_cache *cachep; |
b3b94faa | 735 | |
bc015cb8 | 736 | rcu_read_lock(); |
37b2fa6a | 737 | gl = search_bucket(hash, sdp, &name); |
bc015cb8 | 738 | rcu_read_unlock(); |
b3b94faa | 739 | |
64d576ba SW |
740 | *glp = gl; |
741 | if (gl) | |
b3b94faa | 742 | return 0; |
64d576ba SW |
743 | if (!create) |
744 | return -ENOENT; | |
b3b94faa | 745 | |
009d8518 | 746 | if (glops->go_flags & GLOF_ASPACE) |
bc015cb8 | 747 | cachep = gfs2_glock_aspace_cachep; |
009d8518 | 748 | else |
bc015cb8 SW |
749 | cachep = gfs2_glock_cachep; |
750 | gl = kmem_cache_alloc(cachep, GFP_KERNEL); | |
b3b94faa DT |
751 | if (!gl) |
752 | return -ENOMEM; | |
753 | ||
8f05228e | 754 | atomic_inc(&sdp->sd_glock_disposal); |
a245769f | 755 | gl->gl_sbd = sdp; |
ec45d9f5 | 756 | gl->gl_flags = 0; |
b3b94faa | 757 | gl->gl_name = name; |
16feb9fe | 758 | atomic_set(&gl->gl_ref, 1); |
b3b94faa | 759 | gl->gl_state = LM_ST_UNLOCKED; |
6802e340 | 760 | gl->gl_target = LM_ST_UNLOCKED; |
c4f68a13 | 761 | gl->gl_demote_state = LM_ST_EXCLUSIVE; |
37b2fa6a | 762 | gl->gl_hash = hash; |
b3b94faa | 763 | gl->gl_ops = glops; |
a245769f SW |
764 | gl->gl_dstamp = ktime_set(0, 0); |
765 | preempt_disable(); | |
766 | /* We use the global stats to estimate the initial per-glock stats */ | |
767 | gl->gl_stats = this_cpu_ptr(sdp->sd_lkstats)->lkstats[glops->go_type]; | |
768 | preempt_enable(); | |
769 | gl->gl_stats.stats[GFS2_LKS_DCOUNT] = 0; | |
770 | gl->gl_stats.stats[GFS2_LKS_QCOUNT] = 0; | |
f057f6cd | 771 | memset(&gl->gl_lksb, 0, sizeof(struct dlm_lksb)); |
90306c41 | 772 | memset(gl->gl_lvb, 0, 32 * sizeof(char)); |
f057f6cd | 773 | gl->gl_lksb.sb_lvbptr = gl->gl_lvb; |
c4f68a13 | 774 | gl->gl_tchange = jiffies; |
ec45d9f5 | 775 | gl->gl_object = NULL; |
7cf8dcd3 | 776 | gl->gl_hold_time = GL_GLOCK_DFT_HOLD; |
c4f68a13 | 777 | INIT_DELAYED_WORK(&gl->gl_work, glock_work_func); |
b94a170e | 778 | INIT_WORK(&gl->gl_delete, delete_work_func); |
b3b94faa | 779 | |
009d8518 SW |
780 | mapping = gfs2_glock2aspace(gl); |
781 | if (mapping) { | |
782 | mapping->a_ops = &gfs2_meta_aops; | |
783 | mapping->host = s->s_bdev->bd_inode; | |
784 | mapping->flags = 0; | |
785 | mapping_set_gfp_mask(mapping, GFP_NOFS); | |
786 | mapping->assoc_mapping = NULL; | |
787 | mapping->backing_dev_info = s->s_bdi; | |
788 | mapping->writeback_index = 0; | |
b3b94faa DT |
789 | } |
790 | ||
bc015cb8 | 791 | spin_lock_bucket(hash); |
37b2fa6a | 792 | tmp = search_bucket(hash, sdp, &name); |
b3b94faa | 793 | if (tmp) { |
bc015cb8 SW |
794 | spin_unlock_bucket(hash); |
795 | kmem_cache_free(cachep, gl); | |
fc0e38da | 796 | atomic_dec(&sdp->sd_glock_disposal); |
b3b94faa DT |
797 | gl = tmp; |
798 | } else { | |
bc015cb8 SW |
799 | hlist_bl_add_head_rcu(&gl->gl_list, &gl_hash_table[hash]); |
800 | spin_unlock_bucket(hash); | |
b3b94faa DT |
801 | } |
802 | ||
803 | *glp = gl; | |
804 | ||
805 | return 0; | |
b3b94faa DT |
806 | } |
807 | ||
808 | /** | |
809 | * gfs2_holder_init - initialize a struct gfs2_holder in the default way | |
810 | * @gl: the glock | |
811 | * @state: the state we're requesting | |
812 | * @flags: the modifier flags | |
813 | * @gh: the holder structure | |
814 | * | |
815 | */ | |
816 | ||
190562bd | 817 | void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags, |
b3b94faa DT |
818 | struct gfs2_holder *gh) |
819 | { | |
820 | INIT_LIST_HEAD(&gh->gh_list); | |
821 | gh->gh_gl = gl; | |
d0dc80db | 822 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
b1e058da | 823 | gh->gh_owner_pid = get_pid(task_pid(current)); |
b3b94faa DT |
824 | gh->gh_state = state; |
825 | gh->gh_flags = flags; | |
826 | gh->gh_error = 0; | |
827 | gh->gh_iflags = 0; | |
b3b94faa DT |
828 | gfs2_glock_hold(gl); |
829 | } | |
830 | ||
831 | /** | |
832 | * gfs2_holder_reinit - reinitialize a struct gfs2_holder so we can requeue it | |
833 | * @state: the state we're requesting | |
834 | * @flags: the modifier flags | |
835 | * @gh: the holder structure | |
836 | * | |
837 | * Don't mess with the glock. | |
838 | * | |
839 | */ | |
840 | ||
190562bd | 841 | void gfs2_holder_reinit(unsigned int state, unsigned flags, struct gfs2_holder *gh) |
b3b94faa DT |
842 | { |
843 | gh->gh_state = state; | |
579b78a4 | 844 | gh->gh_flags = flags; |
3b8249f6 | 845 | gh->gh_iflags = 0; |
d0dc80db | 846 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
1a0eae88 BP |
847 | if (gh->gh_owner_pid) |
848 | put_pid(gh->gh_owner_pid); | |
849 | gh->gh_owner_pid = get_pid(task_pid(current)); | |
b3b94faa DT |
850 | } |
851 | ||
852 | /** | |
853 | * gfs2_holder_uninit - uninitialize a holder structure (drop glock reference) | |
854 | * @gh: the holder structure | |
855 | * | |
856 | */ | |
857 | ||
858 | void gfs2_holder_uninit(struct gfs2_holder *gh) | |
859 | { | |
b1e058da | 860 | put_pid(gh->gh_owner_pid); |
b3b94faa DT |
861 | gfs2_glock_put(gh->gh_gl); |
862 | gh->gh_gl = NULL; | |
d0dc80db | 863 | gh->gh_ip = 0; |
b3b94faa DT |
864 | } |
865 | ||
fe64d517 SW |
866 | /** |
867 | * gfs2_glock_holder_wait | |
868 | * @word: unused | |
869 | * | |
870 | * This function and gfs2_glock_demote_wait both show up in the WCHAN | |
871 | * field. Thus I've separated these otherwise identical functions in | |
872 | * order to be more informative to the user. | |
873 | */ | |
874 | ||
875 | static int gfs2_glock_holder_wait(void *word) | |
fee852e3 SW |
876 | { |
877 | schedule(); | |
878 | return 0; | |
879 | } | |
880 | ||
fe64d517 SW |
881 | static int gfs2_glock_demote_wait(void *word) |
882 | { | |
883 | schedule(); | |
884 | return 0; | |
885 | } | |
886 | ||
6802e340 | 887 | static void wait_on_holder(struct gfs2_holder *gh) |
da755fdb | 888 | { |
7cf8dcd3 BP |
889 | unsigned long time1 = jiffies; |
890 | ||
6802e340 | 891 | might_sleep(); |
fe64d517 | 892 | wait_on_bit(&gh->gh_iflags, HIF_WAIT, gfs2_glock_holder_wait, TASK_UNINTERRUPTIBLE); |
7cf8dcd3 BP |
893 | if (time_after(jiffies, time1 + HZ)) /* have we waited > a second? */ |
894 | /* Lengthen the minimum hold time. */ | |
895 | gh->gh_gl->gl_hold_time = min(gh->gh_gl->gl_hold_time + | |
896 | GL_GLOCK_HOLD_INCR, | |
897 | GL_GLOCK_MAX_HOLD); | |
da755fdb SW |
898 | } |
899 | ||
6802e340 | 900 | static void wait_on_demote(struct gfs2_glock *gl) |
b3b94faa | 901 | { |
6802e340 | 902 | might_sleep(); |
fe64d517 | 903 | wait_on_bit(&gl->gl_flags, GLF_DEMOTE, gfs2_glock_demote_wait, TASK_UNINTERRUPTIBLE); |
b3b94faa DT |
904 | } |
905 | ||
906 | /** | |
6802e340 SW |
907 | * handle_callback - process a demote request |
908 | * @gl: the glock | |
909 | * @state: the state the caller wants us to change to | |
b3b94faa | 910 | * |
6802e340 SW |
911 | * There are only two requests that we are going to see in actual |
912 | * practise: LM_ST_SHARED and LM_ST_UNLOCKED | |
b3b94faa DT |
913 | */ |
914 | ||
6802e340 | 915 | static void handle_callback(struct gfs2_glock *gl, unsigned int state, |
97cc1025 | 916 | unsigned long delay) |
b3b94faa | 917 | { |
6802e340 | 918 | int bit = delay ? GLF_PENDING_DEMOTE : GLF_DEMOTE; |
b3b94faa | 919 | |
6802e340 SW |
920 | set_bit(bit, &gl->gl_flags); |
921 | if (gl->gl_demote_state == LM_ST_EXCLUSIVE) { | |
922 | gl->gl_demote_state = state; | |
923 | gl->gl_demote_time = jiffies; | |
6802e340 SW |
924 | } else if (gl->gl_demote_state != LM_ST_UNLOCKED && |
925 | gl->gl_demote_state != state) { | |
926 | gl->gl_demote_state = LM_ST_UNLOCKED; | |
b3b94faa | 927 | } |
b94a170e BM |
928 | if (gl->gl_ops->go_callback) |
929 | gl->gl_ops->go_callback(gl); | |
63997775 | 930 | trace_gfs2_demote_rq(gl); |
b3b94faa DT |
931 | } |
932 | ||
933 | /** | |
6802e340 | 934 | * gfs2_glock_wait - wait on a glock acquisition |
b3b94faa DT |
935 | * @gh: the glock holder |
936 | * | |
937 | * Returns: 0 on success | |
938 | */ | |
939 | ||
6802e340 | 940 | int gfs2_glock_wait(struct gfs2_holder *gh) |
b3b94faa | 941 | { |
fee852e3 | 942 | wait_on_holder(gh); |
b3b94faa DT |
943 | return gh->gh_error; |
944 | } | |
945 | ||
6802e340 | 946 | void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...) |
7c52b166 | 947 | { |
5e69069c | 948 | struct va_format vaf; |
7c52b166 RP |
949 | va_list args; |
950 | ||
951 | va_start(args, fmt); | |
5e69069c | 952 | |
6802e340 SW |
953 | if (seq) { |
954 | struct gfs2_glock_iter *gi = seq->private; | |
7c52b166 | 955 | vsprintf(gi->string, fmt, args); |
ba1ddcb6 | 956 | seq_puts(seq, gi->string); |
6802e340 | 957 | } else { |
5e69069c JP |
958 | vaf.fmt = fmt; |
959 | vaf.va = &args; | |
960 | ||
961 | printk(KERN_ERR " %pV", &vaf); | |
6802e340 | 962 | } |
5e69069c | 963 | |
7c52b166 RP |
964 | va_end(args); |
965 | } | |
966 | ||
b3b94faa DT |
967 | /** |
968 | * add_to_queue - Add a holder to the wait queue (but look for recursion) | |
969 | * @gh: the holder structure to add | |
970 | * | |
6802e340 SW |
971 | * Eventually we should move the recursive locking trap to a |
972 | * debugging option or something like that. This is the fast | |
973 | * path and needs to have the minimum number of distractions. | |
974 | * | |
b3b94faa DT |
975 | */ |
976 | ||
6802e340 | 977 | static inline void add_to_queue(struct gfs2_holder *gh) |
55ba474d HH |
978 | __releases(&gl->gl_spin) |
979 | __acquires(&gl->gl_spin) | |
b3b94faa DT |
980 | { |
981 | struct gfs2_glock *gl = gh->gh_gl; | |
6802e340 SW |
982 | struct gfs2_sbd *sdp = gl->gl_sbd; |
983 | struct list_head *insert_pt = NULL; | |
984 | struct gfs2_holder *gh2; | |
985 | int try_lock = 0; | |
b3b94faa | 986 | |
b1e058da | 987 | BUG_ON(gh->gh_owner_pid == NULL); |
fee852e3 SW |
988 | if (test_and_set_bit(HIF_WAIT, &gh->gh_iflags)) |
989 | BUG(); | |
190562bd | 990 | |
6802e340 SW |
991 | if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { |
992 | if (test_bit(GLF_LOCK, &gl->gl_flags)) | |
993 | try_lock = 1; | |
994 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags)) | |
995 | goto fail; | |
996 | } | |
997 | ||
998 | list_for_each_entry(gh2, &gl->gl_holders, gh_list) { | |
999 | if (unlikely(gh2->gh_owner_pid == gh->gh_owner_pid && | |
1000 | (gh->gh_gl->gl_ops->go_type != LM_TYPE_FLOCK))) | |
1001 | goto trap_recursive; | |
1002 | if (try_lock && | |
1003 | !(gh2->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) && | |
1004 | !may_grant(gl, gh)) { | |
1005 | fail: | |
1006 | gh->gh_error = GLR_TRYFAILED; | |
1007 | gfs2_holder_wake(gh); | |
1008 | return; | |
b4c20166 | 1009 | } |
6802e340 SW |
1010 | if (test_bit(HIF_HOLDER, &gh2->gh_iflags)) |
1011 | continue; | |
1012 | if (unlikely((gh->gh_flags & LM_FLAG_PRIORITY) && !insert_pt)) | |
1013 | insert_pt = &gh2->gh_list; | |
1014 | } | |
7b5e3d5f | 1015 | set_bit(GLF_QUEUED, &gl->gl_flags); |
edae38a6 | 1016 | trace_gfs2_glock_queue(gh, 1); |
a245769f SW |
1017 | gfs2_glstats_inc(gl, GFS2_LKS_QCOUNT); |
1018 | gfs2_sbstats_inc(gl, GFS2_LKS_QCOUNT); | |
6802e340 SW |
1019 | if (likely(insert_pt == NULL)) { |
1020 | list_add_tail(&gh->gh_list, &gl->gl_holders); | |
1021 | if (unlikely(gh->gh_flags & LM_FLAG_PRIORITY)) | |
1022 | goto do_cancel; | |
1023 | return; | |
1024 | } | |
1025 | list_add_tail(&gh->gh_list, insert_pt); | |
1026 | do_cancel: | |
1027 | gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list); | |
1028 | if (!(gh->gh_flags & LM_FLAG_PRIORITY)) { | |
1029 | spin_unlock(&gl->gl_spin); | |
048bca22 | 1030 | if (sdp->sd_lockstruct.ls_ops->lm_cancel) |
f057f6cd | 1031 | sdp->sd_lockstruct.ls_ops->lm_cancel(gl); |
6802e340 | 1032 | spin_lock(&gl->gl_spin); |
b3b94faa | 1033 | } |
6802e340 | 1034 | return; |
b3b94faa | 1035 | |
6802e340 SW |
1036 | trap_recursive: |
1037 | print_symbol(KERN_ERR "original: %s\n", gh2->gh_ip); | |
1038 | printk(KERN_ERR "pid: %d\n", pid_nr(gh2->gh_owner_pid)); | |
1039 | printk(KERN_ERR "lock type: %d req lock state : %d\n", | |
1040 | gh2->gh_gl->gl_name.ln_type, gh2->gh_state); | |
1041 | print_symbol(KERN_ERR "new: %s\n", gh->gh_ip); | |
1042 | printk(KERN_ERR "pid: %d\n", pid_nr(gh->gh_owner_pid)); | |
1043 | printk(KERN_ERR "lock type: %d req lock state : %d\n", | |
1044 | gh->gh_gl->gl_name.ln_type, gh->gh_state); | |
1045 | __dump_glock(NULL, gl); | |
1046 | BUG(); | |
b3b94faa DT |
1047 | } |
1048 | ||
1049 | /** | |
1050 | * gfs2_glock_nq - enqueue a struct gfs2_holder onto a glock (acquire a glock) | |
1051 | * @gh: the holder structure | |
1052 | * | |
1053 | * if (gh->gh_flags & GL_ASYNC), this never returns an error | |
1054 | * | |
1055 | * Returns: 0, GLR_TRYFAILED, or errno on failure | |
1056 | */ | |
1057 | ||
1058 | int gfs2_glock_nq(struct gfs2_holder *gh) | |
1059 | { | |
1060 | struct gfs2_glock *gl = gh->gh_gl; | |
1061 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
1062 | int error = 0; | |
1063 | ||
6802e340 | 1064 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
b3b94faa | 1065 | return -EIO; |
b3b94faa | 1066 | |
f42ab085 SW |
1067 | if (test_bit(GLF_LRU, &gl->gl_flags)) |
1068 | gfs2_glock_remove_from_lru(gl); | |
1069 | ||
b3b94faa DT |
1070 | spin_lock(&gl->gl_spin); |
1071 | add_to_queue(gh); | |
0809f6ec SW |
1072 | if ((LM_FLAG_NOEXP & gh->gh_flags) && |
1073 | test_and_clear_bit(GLF_FROZEN, &gl->gl_flags)) | |
1074 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); | |
6802e340 | 1075 | run_queue(gl, 1); |
b3b94faa DT |
1076 | spin_unlock(&gl->gl_spin); |
1077 | ||
6802e340 SW |
1078 | if (!(gh->gh_flags & GL_ASYNC)) |
1079 | error = gfs2_glock_wait(gh); | |
b3b94faa | 1080 | |
b3b94faa DT |
1081 | return error; |
1082 | } | |
1083 | ||
1084 | /** | |
1085 | * gfs2_glock_poll - poll to see if an async request has been completed | |
1086 | * @gh: the holder | |
1087 | * | |
1088 | * Returns: 1 if the request is ready to be gfs2_glock_wait()ed on | |
1089 | */ | |
1090 | ||
1091 | int gfs2_glock_poll(struct gfs2_holder *gh) | |
1092 | { | |
6802e340 | 1093 | return test_bit(HIF_WAIT, &gh->gh_iflags) ? 0 : 1; |
b3b94faa DT |
1094 | } |
1095 | ||
1096 | /** | |
1097 | * gfs2_glock_dq - dequeue a struct gfs2_holder from a glock (release a glock) | |
1098 | * @gh: the glock holder | |
1099 | * | |
1100 | */ | |
1101 | ||
1102 | void gfs2_glock_dq(struct gfs2_holder *gh) | |
1103 | { | |
1104 | struct gfs2_glock *gl = gh->gh_gl; | |
8fb4b536 | 1105 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
c4f68a13 | 1106 | unsigned delay = 0; |
6802e340 | 1107 | int fast_path = 0; |
b3b94faa | 1108 | |
6802e340 | 1109 | spin_lock(&gl->gl_spin); |
b3b94faa | 1110 | if (gh->gh_flags & GL_NOCACHE) |
97cc1025 | 1111 | handle_callback(gl, LM_ST_UNLOCKED, 0); |
b3b94faa | 1112 | |
b3b94faa | 1113 | list_del_init(&gh->gh_list); |
6802e340 | 1114 | if (find_first_holder(gl) == NULL) { |
3042a2cc | 1115 | if (glops->go_unlock) { |
6802e340 | 1116 | GLOCK_BUG_ON(gl, test_and_set_bit(GLF_LOCK, &gl->gl_flags)); |
3042a2cc | 1117 | spin_unlock(&gl->gl_spin); |
b3b94faa | 1118 | glops->go_unlock(gh); |
3042a2cc | 1119 | spin_lock(&gl->gl_spin); |
6802e340 | 1120 | clear_bit(GLF_LOCK, &gl->gl_flags); |
3042a2cc | 1121 | } |
6802e340 SW |
1122 | if (list_empty(&gl->gl_holders) && |
1123 | !test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && | |
1124 | !test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
1125 | fast_path = 1; | |
b3b94faa | 1126 | } |
f42ab085 SW |
1127 | if (!test_bit(GLF_LFLUSH, &gl->gl_flags)) |
1128 | __gfs2_glock_schedule_for_reclaim(gl); | |
63997775 | 1129 | trace_gfs2_glock_queue(gh, 0); |
b3b94faa | 1130 | spin_unlock(&gl->gl_spin); |
6802e340 SW |
1131 | if (likely(fast_path)) |
1132 | return; | |
c4f68a13 BM |
1133 | |
1134 | gfs2_glock_hold(gl); | |
1135 | if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && | |
7cf8dcd3 BP |
1136 | !test_bit(GLF_DEMOTE, &gl->gl_flags) && |
1137 | gl->gl_name.ln_type == LM_TYPE_INODE) | |
1138 | delay = gl->gl_hold_time; | |
c4f68a13 BM |
1139 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0) |
1140 | gfs2_glock_put(gl); | |
b3b94faa DT |
1141 | } |
1142 | ||
d93cfa98 AD |
1143 | void gfs2_glock_dq_wait(struct gfs2_holder *gh) |
1144 | { | |
1145 | struct gfs2_glock *gl = gh->gh_gl; | |
1146 | gfs2_glock_dq(gh); | |
1147 | wait_on_demote(gl); | |
1148 | } | |
1149 | ||
b3b94faa DT |
1150 | /** |
1151 | * gfs2_glock_dq_uninit - dequeue a holder from a glock and initialize it | |
1152 | * @gh: the holder structure | |
1153 | * | |
1154 | */ | |
1155 | ||
1156 | void gfs2_glock_dq_uninit(struct gfs2_holder *gh) | |
1157 | { | |
1158 | gfs2_glock_dq(gh); | |
1159 | gfs2_holder_uninit(gh); | |
1160 | } | |
1161 | ||
1162 | /** | |
1163 | * gfs2_glock_nq_num - acquire a glock based on lock number | |
1164 | * @sdp: the filesystem | |
1165 | * @number: the lock number | |
1166 | * @glops: the glock operations for the type of glock | |
1167 | * @state: the state to acquire the glock in | |
25985edc | 1168 | * @flags: modifier flags for the acquisition |
b3b94faa DT |
1169 | * @gh: the struct gfs2_holder |
1170 | * | |
1171 | * Returns: errno | |
1172 | */ | |
1173 | ||
cd915493 | 1174 | int gfs2_glock_nq_num(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 SW |
1175 | const struct gfs2_glock_operations *glops, |
1176 | unsigned int state, int flags, struct gfs2_holder *gh) | |
b3b94faa DT |
1177 | { |
1178 | struct gfs2_glock *gl; | |
1179 | int error; | |
1180 | ||
1181 | error = gfs2_glock_get(sdp, number, glops, CREATE, &gl); | |
1182 | if (!error) { | |
1183 | error = gfs2_glock_nq_init(gl, state, flags, gh); | |
1184 | gfs2_glock_put(gl); | |
1185 | } | |
1186 | ||
1187 | return error; | |
1188 | } | |
1189 | ||
1190 | /** | |
1191 | * glock_compare - Compare two struct gfs2_glock structures for sorting | |
1192 | * @arg_a: the first structure | |
1193 | * @arg_b: the second structure | |
1194 | * | |
1195 | */ | |
1196 | ||
1197 | static int glock_compare(const void *arg_a, const void *arg_b) | |
1198 | { | |
a5e08a9e SW |
1199 | const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a; |
1200 | const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b; | |
1201 | const struct lm_lockname *a = &gh_a->gh_gl->gl_name; | |
1202 | const struct lm_lockname *b = &gh_b->gh_gl->gl_name; | |
b3b94faa DT |
1203 | |
1204 | if (a->ln_number > b->ln_number) | |
a5e08a9e SW |
1205 | return 1; |
1206 | if (a->ln_number < b->ln_number) | |
1207 | return -1; | |
1c0f4872 | 1208 | BUG_ON(gh_a->gh_gl->gl_ops->go_type == gh_b->gh_gl->gl_ops->go_type); |
a5e08a9e | 1209 | return 0; |
b3b94faa DT |
1210 | } |
1211 | ||
1212 | /** | |
1213 | * nq_m_sync - synchonously acquire more than one glock in deadlock free order | |
1214 | * @num_gh: the number of structures | |
1215 | * @ghs: an array of struct gfs2_holder structures | |
1216 | * | |
1217 | * Returns: 0 on success (all glocks acquired), | |
1218 | * errno on failure (no glocks acquired) | |
1219 | */ | |
1220 | ||
1221 | static int nq_m_sync(unsigned int num_gh, struct gfs2_holder *ghs, | |
1222 | struct gfs2_holder **p) | |
1223 | { | |
1224 | unsigned int x; | |
1225 | int error = 0; | |
1226 | ||
1227 | for (x = 0; x < num_gh; x++) | |
1228 | p[x] = &ghs[x]; | |
1229 | ||
1230 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare, NULL); | |
1231 | ||
1232 | for (x = 0; x < num_gh; x++) { | |
1233 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1234 | ||
1235 | error = gfs2_glock_nq(p[x]); | |
1236 | if (error) { | |
1237 | while (x--) | |
1238 | gfs2_glock_dq(p[x]); | |
1239 | break; | |
1240 | } | |
1241 | } | |
1242 | ||
1243 | return error; | |
1244 | } | |
1245 | ||
1246 | /** | |
1247 | * gfs2_glock_nq_m - acquire multiple glocks | |
1248 | * @num_gh: the number of structures | |
1249 | * @ghs: an array of struct gfs2_holder structures | |
1250 | * | |
b3b94faa DT |
1251 | * |
1252 | * Returns: 0 on success (all glocks acquired), | |
1253 | * errno on failure (no glocks acquired) | |
1254 | */ | |
1255 | ||
1256 | int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1257 | { | |
eaf5bd3c SW |
1258 | struct gfs2_holder *tmp[4]; |
1259 | struct gfs2_holder **pph = tmp; | |
b3b94faa DT |
1260 | int error = 0; |
1261 | ||
eaf5bd3c SW |
1262 | switch(num_gh) { |
1263 | case 0: | |
b3b94faa | 1264 | return 0; |
eaf5bd3c | 1265 | case 1: |
b3b94faa DT |
1266 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); |
1267 | return gfs2_glock_nq(ghs); | |
eaf5bd3c SW |
1268 | default: |
1269 | if (num_gh <= 4) | |
b3b94faa | 1270 | break; |
eaf5bd3c SW |
1271 | pph = kmalloc(num_gh * sizeof(struct gfs2_holder *), GFP_NOFS); |
1272 | if (!pph) | |
1273 | return -ENOMEM; | |
b3b94faa DT |
1274 | } |
1275 | ||
eaf5bd3c | 1276 | error = nq_m_sync(num_gh, ghs, pph); |
b3b94faa | 1277 | |
eaf5bd3c SW |
1278 | if (pph != tmp) |
1279 | kfree(pph); | |
b3b94faa DT |
1280 | |
1281 | return error; | |
1282 | } | |
1283 | ||
1284 | /** | |
1285 | * gfs2_glock_dq_m - release multiple glocks | |
1286 | * @num_gh: the number of structures | |
1287 | * @ghs: an array of struct gfs2_holder structures | |
1288 | * | |
1289 | */ | |
1290 | ||
1291 | void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1292 | { | |
fa1bbdea BP |
1293 | while (num_gh--) |
1294 | gfs2_glock_dq(&ghs[num_gh]); | |
b3b94faa DT |
1295 | } |
1296 | ||
1297 | /** | |
1298 | * gfs2_glock_dq_uninit_m - release multiple glocks | |
1299 | * @num_gh: the number of structures | |
1300 | * @ghs: an array of struct gfs2_holder structures | |
1301 | * | |
1302 | */ | |
1303 | ||
1304 | void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1305 | { | |
fa1bbdea BP |
1306 | while (num_gh--) |
1307 | gfs2_glock_dq_uninit(&ghs[num_gh]); | |
b3b94faa DT |
1308 | } |
1309 | ||
f057f6cd | 1310 | void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state) |
da755fdb | 1311 | { |
c4f68a13 BM |
1312 | unsigned long delay = 0; |
1313 | unsigned long holdtime; | |
1314 | unsigned long now = jiffies; | |
b3b94faa | 1315 | |
f057f6cd | 1316 | gfs2_glock_hold(gl); |
7cf8dcd3 BP |
1317 | holdtime = gl->gl_tchange + gl->gl_hold_time; |
1318 | if (test_bit(GLF_QUEUED, &gl->gl_flags) && | |
1319 | gl->gl_name.ln_type == LM_TYPE_INODE) { | |
7b5e3d5f SW |
1320 | if (time_before(now, holdtime)) |
1321 | delay = holdtime - now; | |
1322 | if (test_bit(GLF_REPLY_PENDING, &gl->gl_flags)) | |
7cf8dcd3 | 1323 | delay = gl->gl_hold_time; |
7b5e3d5f | 1324 | } |
b3b94faa | 1325 | |
6802e340 | 1326 | spin_lock(&gl->gl_spin); |
97cc1025 | 1327 | handle_callback(gl, state, delay); |
6802e340 | 1328 | spin_unlock(&gl->gl_spin); |
c4f68a13 BM |
1329 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0) |
1330 | gfs2_glock_put(gl); | |
b3b94faa DT |
1331 | } |
1332 | ||
0809f6ec SW |
1333 | /** |
1334 | * gfs2_should_freeze - Figure out if glock should be frozen | |
1335 | * @gl: The glock in question | |
1336 | * | |
1337 | * Glocks are not frozen if (a) the result of the dlm operation is | |
1338 | * an error, (b) the locking operation was an unlock operation or | |
1339 | * (c) if there is a "noexp" flagged request anywhere in the queue | |
1340 | * | |
1341 | * Returns: 1 if freezing should occur, 0 otherwise | |
1342 | */ | |
1343 | ||
1344 | static int gfs2_should_freeze(const struct gfs2_glock *gl) | |
1345 | { | |
1346 | const struct gfs2_holder *gh; | |
1347 | ||
1348 | if (gl->gl_reply & ~LM_OUT_ST_MASK) | |
1349 | return 0; | |
1350 | if (gl->gl_target == LM_ST_UNLOCKED) | |
1351 | return 0; | |
1352 | ||
1353 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
1354 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
1355 | continue; | |
1356 | if (LM_FLAG_NOEXP & gh->gh_flags) | |
1357 | return 0; | |
1358 | } | |
1359 | ||
1360 | return 1; | |
1361 | } | |
1362 | ||
b3b94faa | 1363 | /** |
f057f6cd SW |
1364 | * gfs2_glock_complete - Callback used by locking |
1365 | * @gl: Pointer to the glock | |
1366 | * @ret: The return value from the dlm | |
b3b94faa | 1367 | * |
47a25380 SW |
1368 | * The gl_reply field is under the gl_spin lock so that it is ok |
1369 | * to use a bitfield shared with other glock state fields. | |
b3b94faa DT |
1370 | */ |
1371 | ||
f057f6cd | 1372 | void gfs2_glock_complete(struct gfs2_glock *gl, int ret) |
b3b94faa | 1373 | { |
f057f6cd | 1374 | struct lm_lockstruct *ls = &gl->gl_sbd->sd_lockstruct; |
0809f6ec | 1375 | |
47a25380 | 1376 | spin_lock(&gl->gl_spin); |
f057f6cd | 1377 | gl->gl_reply = ret; |
0809f6ec | 1378 | |
e0c2a9aa | 1379 | if (unlikely(test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))) { |
0809f6ec | 1380 | if (gfs2_should_freeze(gl)) { |
f057f6cd | 1381 | set_bit(GLF_FROZEN, &gl->gl_flags); |
0809f6ec | 1382 | spin_unlock(&gl->gl_spin); |
b3b94faa | 1383 | return; |
0809f6ec | 1384 | } |
b3b94faa | 1385 | } |
47a25380 SW |
1386 | |
1387 | spin_unlock(&gl->gl_spin); | |
f057f6cd | 1388 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
47a25380 | 1389 | smp_wmb(); |
f057f6cd SW |
1390 | gfs2_glock_hold(gl); |
1391 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) | |
1392 | gfs2_glock_put(gl); | |
b3b94faa DT |
1393 | } |
1394 | ||
b3b94faa | 1395 | |
1495f230 YH |
1396 | static int gfs2_shrink_glock_memory(struct shrinker *shrink, |
1397 | struct shrink_control *sc) | |
b3b94faa DT |
1398 | { |
1399 | struct gfs2_glock *gl; | |
97cc1025 SW |
1400 | int may_demote; |
1401 | int nr_skipped = 0; | |
1495f230 YH |
1402 | int nr = sc->nr_to_scan; |
1403 | gfp_t gfp_mask = sc->gfp_mask; | |
97cc1025 | 1404 | LIST_HEAD(skipped); |
b3b94faa | 1405 | |
97cc1025 SW |
1406 | if (nr == 0) |
1407 | goto out; | |
b3b94faa | 1408 | |
97cc1025 SW |
1409 | if (!(gfp_mask & __GFP_FS)) |
1410 | return -1; | |
b3b94faa | 1411 | |
97cc1025 SW |
1412 | spin_lock(&lru_lock); |
1413 | while(nr && !list_empty(&lru_list)) { | |
1414 | gl = list_entry(lru_list.next, struct gfs2_glock, gl_lru); | |
1415 | list_del_init(&gl->gl_lru); | |
627c10b7 | 1416 | clear_bit(GLF_LRU, &gl->gl_flags); |
97cc1025 SW |
1417 | atomic_dec(&lru_count); |
1418 | ||
1419 | /* Test for being demotable */ | |
1420 | if (!test_and_set_bit(GLF_LOCK, &gl->gl_flags)) { | |
1421 | gfs2_glock_hold(gl); | |
97cc1025 SW |
1422 | spin_unlock(&lru_lock); |
1423 | spin_lock(&gl->gl_spin); | |
1424 | may_demote = demote_ok(gl); | |
97cc1025 SW |
1425 | if (may_demote) { |
1426 | handle_callback(gl, LM_ST_UNLOCKED, 0); | |
1427 | nr--; | |
97cc1025 | 1428 | } |
7e71c55e SW |
1429 | clear_bit(GLF_LOCK, &gl->gl_flags); |
1430 | smp_mb__after_clear_bit(); | |
2163b1e6 | 1431 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
b94a170e BM |
1432 | gfs2_glock_put_nolock(gl); |
1433 | spin_unlock(&gl->gl_spin); | |
97cc1025 | 1434 | spin_lock(&lru_lock); |
2163b1e6 | 1435 | continue; |
97cc1025 | 1436 | } |
2163b1e6 SW |
1437 | nr_skipped++; |
1438 | list_add(&gl->gl_lru, &skipped); | |
627c10b7 | 1439 | set_bit(GLF_LRU, &gl->gl_flags); |
b3b94faa | 1440 | } |
97cc1025 SW |
1441 | list_splice(&skipped, &lru_list); |
1442 | atomic_add(nr_skipped, &lru_count); | |
1443 | spin_unlock(&lru_lock); | |
1444 | out: | |
1445 | return (atomic_read(&lru_count) / 100) * sysctl_vfs_cache_pressure; | |
b3b94faa DT |
1446 | } |
1447 | ||
97cc1025 SW |
1448 | static struct shrinker glock_shrinker = { |
1449 | .shrink = gfs2_shrink_glock_memory, | |
1450 | .seeks = DEFAULT_SEEKS, | |
1451 | }; | |
1452 | ||
b3b94faa DT |
1453 | /** |
1454 | * examine_bucket - Call a function for glock in a hash bucket | |
1455 | * @examiner: the function | |
1456 | * @sdp: the filesystem | |
1457 | * @bucket: the bucket | |
1458 | * | |
b3b94faa DT |
1459 | */ |
1460 | ||
bc015cb8 | 1461 | static void examine_bucket(glock_examiner examiner, const struct gfs2_sbd *sdp, |
37b2fa6a | 1462 | unsigned int hash) |
b3b94faa | 1463 | { |
bc015cb8 SW |
1464 | struct gfs2_glock *gl; |
1465 | struct hlist_bl_head *head = &gl_hash_table[hash]; | |
1466 | struct hlist_bl_node *pos; | |
b3b94faa | 1467 | |
bc015cb8 SW |
1468 | rcu_read_lock(); |
1469 | hlist_bl_for_each_entry_rcu(gl, pos, head, gl_list) { | |
1470 | if ((gl->gl_sbd == sdp) && atomic_read(&gl->gl_ref)) | |
24264434 | 1471 | examiner(gl); |
b3b94faa | 1472 | } |
bc015cb8 | 1473 | rcu_read_unlock(); |
8fbbfd21 | 1474 | cond_resched(); |
bc015cb8 SW |
1475 | } |
1476 | ||
1477 | static void glock_hash_walk(glock_examiner examiner, const struct gfs2_sbd *sdp) | |
1478 | { | |
1479 | unsigned x; | |
1480 | ||
1481 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) | |
1482 | examine_bucket(examiner, sdp, x); | |
b3b94faa DT |
1483 | } |
1484 | ||
f057f6cd SW |
1485 | |
1486 | /** | |
1487 | * thaw_glock - thaw out a glock which has an unprocessed reply waiting | |
1488 | * @gl: The glock to thaw | |
1489 | * | |
1490 | * N.B. When we freeze a glock, we leave a ref to the glock outstanding, | |
1491 | * so this has to result in the ref count being dropped by one. | |
1492 | */ | |
1493 | ||
1494 | static void thaw_glock(struct gfs2_glock *gl) | |
1495 | { | |
1496 | if (!test_and_clear_bit(GLF_FROZEN, &gl->gl_flags)) | |
1497 | return; | |
f057f6cd SW |
1498 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
1499 | gfs2_glock_hold(gl); | |
1500 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) | |
1501 | gfs2_glock_put(gl); | |
f057f6cd SW |
1502 | } |
1503 | ||
b3b94faa DT |
1504 | /** |
1505 | * clear_glock - look at a glock and see if we can free it from glock cache | |
1506 | * @gl: the glock to look at | |
1507 | * | |
1508 | */ | |
1509 | ||
1510 | static void clear_glock(struct gfs2_glock *gl) | |
1511 | { | |
f42ab085 | 1512 | gfs2_glock_remove_from_lru(gl); |
b3b94faa | 1513 | |
6802e340 | 1514 | spin_lock(&gl->gl_spin); |
c741c455 | 1515 | if (gl->gl_state != LM_ST_UNLOCKED) |
97cc1025 | 1516 | handle_callback(gl, LM_ST_UNLOCKED, 0); |
6802e340 SW |
1517 | spin_unlock(&gl->gl_spin); |
1518 | gfs2_glock_hold(gl); | |
1519 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) | |
1520 | gfs2_glock_put(gl); | |
b3b94faa DT |
1521 | } |
1522 | ||
f057f6cd SW |
1523 | /** |
1524 | * gfs2_glock_thaw - Thaw any frozen glocks | |
1525 | * @sdp: The super block | |
1526 | * | |
1527 | */ | |
1528 | ||
1529 | void gfs2_glock_thaw(struct gfs2_sbd *sdp) | |
1530 | { | |
bc015cb8 SW |
1531 | glock_hash_walk(thaw_glock, sdp); |
1532 | } | |
f057f6cd | 1533 | |
bc015cb8 SW |
1534 | static int dump_glock(struct seq_file *seq, struct gfs2_glock *gl) |
1535 | { | |
1536 | int ret; | |
1537 | spin_lock(&gl->gl_spin); | |
1538 | ret = __dump_glock(seq, gl); | |
1539 | spin_unlock(&gl->gl_spin); | |
1540 | return ret; | |
1541 | } | |
1542 | ||
1543 | static void dump_glock_func(struct gfs2_glock *gl) | |
1544 | { | |
1545 | dump_glock(NULL, gl); | |
f057f6cd SW |
1546 | } |
1547 | ||
b3b94faa DT |
1548 | /** |
1549 | * gfs2_gl_hash_clear - Empty out the glock hash table | |
1550 | * @sdp: the filesystem | |
1551 | * @wait: wait until it's all gone | |
1552 | * | |
1bdad606 | 1553 | * Called when unmounting the filesystem. |
b3b94faa DT |
1554 | */ |
1555 | ||
fefc03bf | 1556 | void gfs2_gl_hash_clear(struct gfs2_sbd *sdp) |
b3b94faa | 1557 | { |
bc015cb8 | 1558 | glock_hash_walk(clear_glock, sdp); |
8f05228e SW |
1559 | flush_workqueue(glock_workqueue); |
1560 | wait_event(sdp->sd_glock_wait, atomic_read(&sdp->sd_glock_disposal) == 0); | |
bc015cb8 | 1561 | glock_hash_walk(dump_glock_func, sdp); |
b3b94faa DT |
1562 | } |
1563 | ||
813e0c46 SW |
1564 | void gfs2_glock_finish_truncate(struct gfs2_inode *ip) |
1565 | { | |
1566 | struct gfs2_glock *gl = ip->i_gl; | |
1567 | int ret; | |
1568 | ||
1569 | ret = gfs2_truncatei_resume(ip); | |
1570 | gfs2_assert_withdraw(gl->gl_sbd, ret == 0); | |
1571 | ||
1572 | spin_lock(&gl->gl_spin); | |
1573 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
1574 | run_queue(gl, 1); | |
1575 | spin_unlock(&gl->gl_spin); | |
1576 | } | |
1577 | ||
6802e340 | 1578 | static const char *state2str(unsigned state) |
04b933f2 | 1579 | { |
6802e340 SW |
1580 | switch(state) { |
1581 | case LM_ST_UNLOCKED: | |
1582 | return "UN"; | |
1583 | case LM_ST_SHARED: | |
1584 | return "SH"; | |
1585 | case LM_ST_DEFERRED: | |
1586 | return "DF"; | |
1587 | case LM_ST_EXCLUSIVE: | |
1588 | return "EX"; | |
1589 | } | |
1590 | return "??"; | |
1591 | } | |
1592 | ||
1593 | static const char *hflags2str(char *buf, unsigned flags, unsigned long iflags) | |
1594 | { | |
1595 | char *p = buf; | |
1596 | if (flags & LM_FLAG_TRY) | |
1597 | *p++ = 't'; | |
1598 | if (flags & LM_FLAG_TRY_1CB) | |
1599 | *p++ = 'T'; | |
1600 | if (flags & LM_FLAG_NOEXP) | |
1601 | *p++ = 'e'; | |
1602 | if (flags & LM_FLAG_ANY) | |
f057f6cd | 1603 | *p++ = 'A'; |
6802e340 SW |
1604 | if (flags & LM_FLAG_PRIORITY) |
1605 | *p++ = 'p'; | |
1606 | if (flags & GL_ASYNC) | |
1607 | *p++ = 'a'; | |
1608 | if (flags & GL_EXACT) | |
1609 | *p++ = 'E'; | |
6802e340 SW |
1610 | if (flags & GL_NOCACHE) |
1611 | *p++ = 'c'; | |
1612 | if (test_bit(HIF_HOLDER, &iflags)) | |
1613 | *p++ = 'H'; | |
1614 | if (test_bit(HIF_WAIT, &iflags)) | |
1615 | *p++ = 'W'; | |
1616 | if (test_bit(HIF_FIRST, &iflags)) | |
1617 | *p++ = 'F'; | |
1618 | *p = 0; | |
1619 | return buf; | |
04b933f2 RP |
1620 | } |
1621 | ||
b3b94faa DT |
1622 | /** |
1623 | * dump_holder - print information about a glock holder | |
6802e340 | 1624 | * @seq: the seq_file struct |
b3b94faa DT |
1625 | * @gh: the glock holder |
1626 | * | |
1627 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
1628 | */ | |
1629 | ||
6802e340 | 1630 | static int dump_holder(struct seq_file *seq, const struct gfs2_holder *gh) |
b3b94faa | 1631 | { |
6802e340 | 1632 | struct task_struct *gh_owner = NULL; |
6802e340 | 1633 | char flags_buf[32]; |
b3b94faa | 1634 | |
6802e340 | 1635 | if (gh->gh_owner_pid) |
b1e058da | 1636 | gh_owner = pid_task(gh->gh_owner_pid, PIDTYPE_PID); |
cc18152e JP |
1637 | gfs2_print_dbg(seq, " H: s:%s f:%s e:%d p:%ld [%s] %pS\n", |
1638 | state2str(gh->gh_state), | |
1639 | hflags2str(flags_buf, gh->gh_flags, gh->gh_iflags), | |
1640 | gh->gh_error, | |
1641 | gh->gh_owner_pid ? (long)pid_nr(gh->gh_owner_pid) : -1, | |
1642 | gh_owner ? gh_owner->comm : "(ended)", | |
1643 | (void *)gh->gh_ip); | |
7c52b166 | 1644 | return 0; |
b3b94faa DT |
1645 | } |
1646 | ||
627c10b7 | 1647 | static const char *gflags2str(char *buf, const struct gfs2_glock *gl) |
6802e340 | 1648 | { |
627c10b7 | 1649 | const unsigned long *gflags = &gl->gl_flags; |
6802e340 | 1650 | char *p = buf; |
627c10b7 | 1651 | |
6802e340 SW |
1652 | if (test_bit(GLF_LOCK, gflags)) |
1653 | *p++ = 'l'; | |
6802e340 SW |
1654 | if (test_bit(GLF_DEMOTE, gflags)) |
1655 | *p++ = 'D'; | |
1656 | if (test_bit(GLF_PENDING_DEMOTE, gflags)) | |
1657 | *p++ = 'd'; | |
1658 | if (test_bit(GLF_DEMOTE_IN_PROGRESS, gflags)) | |
1659 | *p++ = 'p'; | |
1660 | if (test_bit(GLF_DIRTY, gflags)) | |
1661 | *p++ = 'y'; | |
1662 | if (test_bit(GLF_LFLUSH, gflags)) | |
1663 | *p++ = 'f'; | |
1664 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, gflags)) | |
1665 | *p++ = 'i'; | |
1666 | if (test_bit(GLF_REPLY_PENDING, gflags)) | |
1667 | *p++ = 'r'; | |
f057f6cd | 1668 | if (test_bit(GLF_INITIAL, gflags)) |
d8348de0 | 1669 | *p++ = 'I'; |
f057f6cd SW |
1670 | if (test_bit(GLF_FROZEN, gflags)) |
1671 | *p++ = 'F'; | |
7b5e3d5f SW |
1672 | if (test_bit(GLF_QUEUED, gflags)) |
1673 | *p++ = 'q'; | |
627c10b7 SW |
1674 | if (test_bit(GLF_LRU, gflags)) |
1675 | *p++ = 'L'; | |
1676 | if (gl->gl_object) | |
1677 | *p++ = 'o'; | |
a245769f SW |
1678 | if (test_bit(GLF_BLOCKING, gflags)) |
1679 | *p++ = 'b'; | |
6802e340 SW |
1680 | *p = 0; |
1681 | return buf; | |
b3b94faa DT |
1682 | } |
1683 | ||
1684 | /** | |
6802e340 SW |
1685 | * __dump_glock - print information about a glock |
1686 | * @seq: The seq_file struct | |
b3b94faa | 1687 | * @gl: the glock |
6802e340 SW |
1688 | * |
1689 | * The file format is as follows: | |
1690 | * One line per object, capital letters are used to indicate objects | |
1691 | * G = glock, I = Inode, R = rgrp, H = holder. Glocks are not indented, | |
1692 | * other objects are indented by a single space and follow the glock to | |
1693 | * which they are related. Fields are indicated by lower case letters | |
1694 | * followed by a colon and the field value, except for strings which are in | |
1695 | * [] so that its possible to see if they are composed of spaces for | |
1696 | * example. The field's are n = number (id of the object), f = flags, | |
1697 | * t = type, s = state, r = refcount, e = error, p = pid. | |
b3b94faa DT |
1698 | * |
1699 | * Returns: 0 on success, -ENOBUFS when we run out of space | |
1700 | */ | |
1701 | ||
6802e340 | 1702 | static int __dump_glock(struct seq_file *seq, const struct gfs2_glock *gl) |
b3b94faa | 1703 | { |
6802e340 SW |
1704 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
1705 | unsigned long long dtime; | |
1706 | const struct gfs2_holder *gh; | |
1707 | char gflags_buf[32]; | |
1708 | int error = 0; | |
b3b94faa | 1709 | |
6802e340 SW |
1710 | dtime = jiffies - gl->gl_demote_time; |
1711 | dtime *= 1000000/HZ; /* demote time in uSec */ | |
1712 | if (!test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
1713 | dtime = 0; | |
7cf8dcd3 | 1714 | 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 |
1715 | state2str(gl->gl_state), |
1716 | gl->gl_name.ln_type, | |
1717 | (unsigned long long)gl->gl_name.ln_number, | |
627c10b7 | 1718 | gflags2str(gflags_buf, gl), |
6802e340 SW |
1719 | state2str(gl->gl_target), |
1720 | state2str(gl->gl_demote_state), dtime, | |
6802e340 | 1721 | atomic_read(&gl->gl_ail_count), |
f42ab085 | 1722 | atomic_read(&gl->gl_revokes), |
7cf8dcd3 | 1723 | atomic_read(&gl->gl_ref), gl->gl_hold_time); |
b3b94faa | 1724 | |
b3b94faa | 1725 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { |
6802e340 | 1726 | error = dump_holder(seq, gh); |
b3b94faa DT |
1727 | if (error) |
1728 | goto out; | |
1729 | } | |
6802e340 SW |
1730 | if (gl->gl_state != LM_ST_UNLOCKED && glops->go_dump) |
1731 | error = glops->go_dump(seq, gl); | |
a91ea69f | 1732 | out: |
b3b94faa DT |
1733 | return error; |
1734 | } | |
1735 | ||
a245769f SW |
1736 | static int gfs2_glstats_seq_show(struct seq_file *seq, void *iter_ptr) |
1737 | { | |
1738 | struct gfs2_glock *gl = iter_ptr; | |
1739 | ||
1740 | seq_printf(seq, "G: n:%u/%llx rtt:%lld/%lld rttb:%lld/%lld irt:%lld/%lld dcnt: %lld qcnt: %lld\n", | |
1741 | gl->gl_name.ln_type, | |
1742 | (unsigned long long)gl->gl_name.ln_number, | |
1743 | (long long)gl->gl_stats.stats[GFS2_LKS_SRTT], | |
1744 | (long long)gl->gl_stats.stats[GFS2_LKS_SRTTVAR], | |
1745 | (long long)gl->gl_stats.stats[GFS2_LKS_SRTTB], | |
1746 | (long long)gl->gl_stats.stats[GFS2_LKS_SRTTVARB], | |
1747 | (long long)gl->gl_stats.stats[GFS2_LKS_SIRT], | |
1748 | (long long)gl->gl_stats.stats[GFS2_LKS_SIRTVAR], | |
1749 | (long long)gl->gl_stats.stats[GFS2_LKS_DCOUNT], | |
1750 | (long long)gl->gl_stats.stats[GFS2_LKS_QCOUNT]); | |
1751 | return 0; | |
1752 | } | |
1753 | ||
1754 | static const char *gfs2_gltype[] = { | |
1755 | "type", | |
1756 | "reserved", | |
1757 | "nondisk", | |
1758 | "inode", | |
1759 | "rgrp", | |
1760 | "meta", | |
1761 | "iopen", | |
1762 | "flock", | |
1763 | "plock", | |
1764 | "quota", | |
1765 | "journal", | |
1766 | }; | |
1767 | ||
1768 | static const char *gfs2_stype[] = { | |
1769 | [GFS2_LKS_SRTT] = "srtt", | |
1770 | [GFS2_LKS_SRTTVAR] = "srttvar", | |
1771 | [GFS2_LKS_SRTTB] = "srttb", | |
1772 | [GFS2_LKS_SRTTVARB] = "srttvarb", | |
1773 | [GFS2_LKS_SIRT] = "sirt", | |
1774 | [GFS2_LKS_SIRTVAR] = "sirtvar", | |
1775 | [GFS2_LKS_DCOUNT] = "dlm", | |
1776 | [GFS2_LKS_QCOUNT] = "queue", | |
1777 | }; | |
1778 | ||
1779 | #define GFS2_NR_SBSTATS (ARRAY_SIZE(gfs2_gltype) * ARRAY_SIZE(gfs2_stype)) | |
1780 | ||
1781 | static int gfs2_sbstats_seq_show(struct seq_file *seq, void *iter_ptr) | |
1782 | { | |
1783 | struct gfs2_glock_iter *gi = seq->private; | |
1784 | struct gfs2_sbd *sdp = gi->sdp; | |
1785 | unsigned index = gi->hash >> 3; | |
1786 | unsigned subindex = gi->hash & 0x07; | |
1787 | s64 value; | |
1788 | int i; | |
1789 | ||
1790 | if (index == 0 && subindex != 0) | |
1791 | return 0; | |
6802e340 | 1792 | |
a245769f SW |
1793 | seq_printf(seq, "%-10s %8s:", gfs2_gltype[index], |
1794 | (index == 0) ? "cpu": gfs2_stype[subindex]); | |
b3b94faa | 1795 | |
a245769f SW |
1796 | for_each_possible_cpu(i) { |
1797 | const struct gfs2_pcpu_lkstats *lkstats = per_cpu_ptr(sdp->sd_lkstats, i); | |
1798 | if (index == 0) { | |
1799 | value = i; | |
1800 | } else { | |
1801 | value = lkstats->lkstats[index - 1].stats[subindex]; | |
1802 | } | |
1803 | seq_printf(seq, " %15lld", (long long)value); | |
1804 | } | |
1805 | seq_putc(seq, '\n'); | |
1806 | return 0; | |
1807 | } | |
8fbbfd21 | 1808 | |
85d1da67 SW |
1809 | int __init gfs2_glock_init(void) |
1810 | { | |
1811 | unsigned i; | |
1812 | for(i = 0; i < GFS2_GL_HASH_SIZE; i++) { | |
bc015cb8 | 1813 | INIT_HLIST_BL_HEAD(&gl_hash_table[i]); |
087efdd3 | 1814 | } |
8fbbfd21 | 1815 | |
d2115778 | 1816 | glock_workqueue = alloc_workqueue("glock_workqueue", WQ_MEM_RECLAIM | |
58a69cb4 | 1817 | WQ_HIGHPRI | WQ_FREEZABLE, 0); |
97cc1025 | 1818 | if (IS_ERR(glock_workqueue)) |
c4f68a13 | 1819 | return PTR_ERR(glock_workqueue); |
d2115778 | 1820 | gfs2_delete_workqueue = alloc_workqueue("delete_workqueue", |
58a69cb4 | 1821 | WQ_MEM_RECLAIM | WQ_FREEZABLE, |
d2115778 | 1822 | 0); |
b94a170e BM |
1823 | if (IS_ERR(gfs2_delete_workqueue)) { |
1824 | destroy_workqueue(glock_workqueue); | |
1825 | return PTR_ERR(gfs2_delete_workqueue); | |
1826 | } | |
97cc1025 SW |
1827 | |
1828 | register_shrinker(&glock_shrinker); | |
c4f68a13 | 1829 | |
85d1da67 SW |
1830 | return 0; |
1831 | } | |
1832 | ||
8fbbfd21 SW |
1833 | void gfs2_glock_exit(void) |
1834 | { | |
97cc1025 | 1835 | unregister_shrinker(&glock_shrinker); |
c4f68a13 | 1836 | destroy_workqueue(glock_workqueue); |
b94a170e | 1837 | destroy_workqueue(gfs2_delete_workqueue); |
8fbbfd21 SW |
1838 | } |
1839 | ||
bc015cb8 SW |
1840 | static inline struct gfs2_glock *glock_hash_chain(unsigned hash) |
1841 | { | |
1842 | return hlist_bl_entry(hlist_bl_first_rcu(&gl_hash_table[hash]), | |
1843 | struct gfs2_glock, gl_list); | |
1844 | } | |
1845 | ||
1846 | static inline struct gfs2_glock *glock_hash_next(struct gfs2_glock *gl) | |
1847 | { | |
7e32d026 | 1848 | return hlist_bl_entry(rcu_dereference(gl->gl_list.next), |
bc015cb8 SW |
1849 | struct gfs2_glock, gl_list); |
1850 | } | |
1851 | ||
6802e340 | 1852 | static int gfs2_glock_iter_next(struct gfs2_glock_iter *gi) |
7c52b166 | 1853 | { |
7b08fc62 SW |
1854 | struct gfs2_glock *gl; |
1855 | ||
bc015cb8 SW |
1856 | do { |
1857 | gl = gi->gl; | |
1858 | if (gl) { | |
1859 | gi->gl = glock_hash_next(gl); | |
ba1ddcb6 | 1860 | gi->nhash++; |
bc015cb8 | 1861 | } else { |
ba1ddcb6 SW |
1862 | if (gi->hash >= GFS2_GL_HASH_SIZE) { |
1863 | rcu_read_unlock(); | |
1864 | return 1; | |
1865 | } | |
bc015cb8 | 1866 | gi->gl = glock_hash_chain(gi->hash); |
ba1ddcb6 | 1867 | gi->nhash = 0; |
bc015cb8 SW |
1868 | } |
1869 | while (gi->gl == NULL) { | |
1870 | gi->hash++; | |
1871 | if (gi->hash >= GFS2_GL_HASH_SIZE) { | |
1872 | rcu_read_unlock(); | |
1873 | return 1; | |
1874 | } | |
1875 | gi->gl = glock_hash_chain(gi->hash); | |
ba1ddcb6 | 1876 | gi->nhash = 0; |
bc015cb8 SW |
1877 | } |
1878 | /* Skip entries for other sb and dead entries */ | |
1879 | } while (gi->sdp != gi->gl->gl_sbd || atomic_read(&gi->gl->gl_ref) == 0); | |
a947e033 | 1880 | |
7c52b166 RP |
1881 | return 0; |
1882 | } | |
1883 | ||
6802e340 | 1884 | static void *gfs2_glock_seq_start(struct seq_file *seq, loff_t *pos) |
7c52b166 | 1885 | { |
6802e340 | 1886 | struct gfs2_glock_iter *gi = seq->private; |
7c52b166 RP |
1887 | loff_t n = *pos; |
1888 | ||
ba1ddcb6 SW |
1889 | if (gi->last_pos <= *pos) |
1890 | n = gi->nhash + (*pos - gi->last_pos); | |
1891 | else | |
1892 | gi->hash = 0; | |
1893 | ||
1894 | gi->nhash = 0; | |
bc015cb8 | 1895 | rcu_read_lock(); |
7c52b166 | 1896 | |
6802e340 | 1897 | do { |
bc015cb8 | 1898 | if (gfs2_glock_iter_next(gi)) |
7c52b166 | 1899 | return NULL; |
6802e340 | 1900 | } while (n--); |
7c52b166 | 1901 | |
ba1ddcb6 | 1902 | gi->last_pos = *pos; |
6802e340 | 1903 | return gi->gl; |
7c52b166 RP |
1904 | } |
1905 | ||
6802e340 | 1906 | static void *gfs2_glock_seq_next(struct seq_file *seq, void *iter_ptr, |
7c52b166 RP |
1907 | loff_t *pos) |
1908 | { | |
6802e340 | 1909 | struct gfs2_glock_iter *gi = seq->private; |
7c52b166 RP |
1910 | |
1911 | (*pos)++; | |
ba1ddcb6 | 1912 | gi->last_pos = *pos; |
bc015cb8 | 1913 | if (gfs2_glock_iter_next(gi)) |
7c52b166 | 1914 | return NULL; |
7c52b166 | 1915 | |
6802e340 | 1916 | return gi->gl; |
7c52b166 RP |
1917 | } |
1918 | ||
6802e340 | 1919 | static void gfs2_glock_seq_stop(struct seq_file *seq, void *iter_ptr) |
7c52b166 | 1920 | { |
6802e340 | 1921 | struct gfs2_glock_iter *gi = seq->private; |
bc015cb8 SW |
1922 | |
1923 | if (gi->gl) | |
1924 | rcu_read_unlock(); | |
1925 | gi->gl = NULL; | |
7c52b166 RP |
1926 | } |
1927 | ||
6802e340 | 1928 | static int gfs2_glock_seq_show(struct seq_file *seq, void *iter_ptr) |
7c52b166 | 1929 | { |
6802e340 | 1930 | return dump_glock(seq, iter_ptr); |
7c52b166 RP |
1931 | } |
1932 | ||
a245769f SW |
1933 | static void *gfs2_sbstats_seq_start(struct seq_file *seq, loff_t *pos) |
1934 | { | |
1935 | struct gfs2_glock_iter *gi = seq->private; | |
1936 | ||
1937 | gi->hash = *pos; | |
1938 | if (*pos >= GFS2_NR_SBSTATS) | |
1939 | return NULL; | |
1940 | preempt_disable(); | |
1941 | return SEQ_START_TOKEN; | |
1942 | } | |
1943 | ||
1944 | static void *gfs2_sbstats_seq_next(struct seq_file *seq, void *iter_ptr, | |
1945 | loff_t *pos) | |
1946 | { | |
1947 | struct gfs2_glock_iter *gi = seq->private; | |
1948 | (*pos)++; | |
1949 | gi->hash++; | |
1950 | if (gi->hash >= GFS2_NR_SBSTATS) { | |
1951 | preempt_enable(); | |
1952 | return NULL; | |
1953 | } | |
1954 | return SEQ_START_TOKEN; | |
1955 | } | |
1956 | ||
1957 | static void gfs2_sbstats_seq_stop(struct seq_file *seq, void *iter_ptr) | |
1958 | { | |
1959 | preempt_enable(); | |
1960 | } | |
1961 | ||
4ef29002 | 1962 | static const struct seq_operations gfs2_glock_seq_ops = { |
7c52b166 RP |
1963 | .start = gfs2_glock_seq_start, |
1964 | .next = gfs2_glock_seq_next, | |
1965 | .stop = gfs2_glock_seq_stop, | |
1966 | .show = gfs2_glock_seq_show, | |
1967 | }; | |
1968 | ||
a245769f SW |
1969 | static const struct seq_operations gfs2_glstats_seq_ops = { |
1970 | .start = gfs2_glock_seq_start, | |
1971 | .next = gfs2_glock_seq_next, | |
1972 | .stop = gfs2_glock_seq_stop, | |
1973 | .show = gfs2_glstats_seq_show, | |
1974 | }; | |
1975 | ||
1976 | static const struct seq_operations gfs2_sbstats_seq_ops = { | |
1977 | .start = gfs2_sbstats_seq_start, | |
1978 | .next = gfs2_sbstats_seq_next, | |
1979 | .stop = gfs2_sbstats_seq_stop, | |
1980 | .show = gfs2_sbstats_seq_show, | |
1981 | }; | |
1982 | ||
1983 | static int gfs2_glocks_open(struct inode *inode, struct file *file) | |
7c52b166 | 1984 | { |
6802e340 SW |
1985 | int ret = seq_open_private(file, &gfs2_glock_seq_ops, |
1986 | sizeof(struct gfs2_glock_iter)); | |
1987 | if (ret == 0) { | |
1988 | struct seq_file *seq = file->private_data; | |
1989 | struct gfs2_glock_iter *gi = seq->private; | |
1990 | gi->sdp = inode->i_private; | |
df5d2f55 SW |
1991 | seq->buf = kmalloc(8*PAGE_SIZE, GFP_KERNEL | __GFP_NOWARN); |
1992 | if (seq->buf) | |
1993 | seq->size = 8*PAGE_SIZE; | |
6802e340 SW |
1994 | } |
1995 | return ret; | |
7c52b166 RP |
1996 | } |
1997 | ||
a245769f SW |
1998 | static int gfs2_glstats_open(struct inode *inode, struct file *file) |
1999 | { | |
2000 | int ret = seq_open_private(file, &gfs2_glstats_seq_ops, | |
2001 | sizeof(struct gfs2_glock_iter)); | |
2002 | if (ret == 0) { | |
2003 | struct seq_file *seq = file->private_data; | |
2004 | struct gfs2_glock_iter *gi = seq->private; | |
2005 | gi->sdp = inode->i_private; | |
df5d2f55 SW |
2006 | seq->buf = kmalloc(8*PAGE_SIZE, GFP_KERNEL | __GFP_NOWARN); |
2007 | if (seq->buf) | |
2008 | seq->size = 8*PAGE_SIZE; | |
a245769f SW |
2009 | } |
2010 | return ret; | |
2011 | } | |
2012 | ||
2013 | static int gfs2_sbstats_open(struct inode *inode, struct file *file) | |
2014 | { | |
2015 | int ret = seq_open_private(file, &gfs2_sbstats_seq_ops, | |
2016 | sizeof(struct gfs2_glock_iter)); | |
2017 | if (ret == 0) { | |
2018 | struct seq_file *seq = file->private_data; | |
2019 | struct gfs2_glock_iter *gi = seq->private; | |
2020 | gi->sdp = inode->i_private; | |
2021 | } | |
2022 | return ret; | |
2023 | } | |
2024 | ||
2025 | static const struct file_operations gfs2_glocks_fops = { | |
2026 | .owner = THIS_MODULE, | |
2027 | .open = gfs2_glocks_open, | |
2028 | .read = seq_read, | |
2029 | .llseek = seq_lseek, | |
2030 | .release = seq_release_private, | |
2031 | }; | |
2032 | ||
2033 | static const struct file_operations gfs2_glstats_fops = { | |
7c52b166 | 2034 | .owner = THIS_MODULE, |
a245769f SW |
2035 | .open = gfs2_glstats_open, |
2036 | .read = seq_read, | |
2037 | .llseek = seq_lseek, | |
2038 | .release = seq_release_private, | |
2039 | }; | |
2040 | ||
2041 | static const struct file_operations gfs2_sbstats_fops = { | |
2042 | .owner = THIS_MODULE, | |
2043 | .open = gfs2_sbstats_open, | |
7c52b166 RP |
2044 | .read = seq_read, |
2045 | .llseek = seq_lseek, | |
6802e340 | 2046 | .release = seq_release_private, |
7c52b166 RP |
2047 | }; |
2048 | ||
2049 | int gfs2_create_debugfs_file(struct gfs2_sbd *sdp) | |
2050 | { | |
5f882096 RP |
2051 | sdp->debugfs_dir = debugfs_create_dir(sdp->sd_table_name, gfs2_root); |
2052 | if (!sdp->debugfs_dir) | |
2053 | return -ENOMEM; | |
2054 | sdp->debugfs_dentry_glocks = debugfs_create_file("glocks", | |
2055 | S_IFREG | S_IRUGO, | |
2056 | sdp->debugfs_dir, sdp, | |
a245769f | 2057 | &gfs2_glocks_fops); |
5f882096 | 2058 | if (!sdp->debugfs_dentry_glocks) |
a245769f SW |
2059 | goto fail; |
2060 | ||
2061 | sdp->debugfs_dentry_glstats = debugfs_create_file("glstats", | |
2062 | S_IFREG | S_IRUGO, | |
2063 | sdp->debugfs_dir, sdp, | |
2064 | &gfs2_glstats_fops); | |
2065 | if (!sdp->debugfs_dentry_glstats) | |
2066 | goto fail; | |
2067 | ||
2068 | sdp->debugfs_dentry_sbstats = debugfs_create_file("sbstats", | |
2069 | S_IFREG | S_IRUGO, | |
2070 | sdp->debugfs_dir, sdp, | |
2071 | &gfs2_sbstats_fops); | |
2072 | if (!sdp->debugfs_dentry_sbstats) | |
2073 | goto fail; | |
7c52b166 RP |
2074 | |
2075 | return 0; | |
a245769f SW |
2076 | fail: |
2077 | gfs2_delete_debugfs_file(sdp); | |
2078 | return -ENOMEM; | |
7c52b166 RP |
2079 | } |
2080 | ||
2081 | void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp) | |
2082 | { | |
a245769f | 2083 | if (sdp->debugfs_dir) { |
5f882096 RP |
2084 | if (sdp->debugfs_dentry_glocks) { |
2085 | debugfs_remove(sdp->debugfs_dentry_glocks); | |
2086 | sdp->debugfs_dentry_glocks = NULL; | |
2087 | } | |
a245769f SW |
2088 | if (sdp->debugfs_dentry_glstats) { |
2089 | debugfs_remove(sdp->debugfs_dentry_glstats); | |
2090 | sdp->debugfs_dentry_glstats = NULL; | |
2091 | } | |
2092 | if (sdp->debugfs_dentry_sbstats) { | |
2093 | debugfs_remove(sdp->debugfs_dentry_sbstats); | |
2094 | sdp->debugfs_dentry_sbstats = NULL; | |
2095 | } | |
5f882096 RP |
2096 | debugfs_remove(sdp->debugfs_dir); |
2097 | sdp->debugfs_dir = NULL; | |
2098 | } | |
7c52b166 RP |
2099 | } |
2100 | ||
2101 | int gfs2_register_debugfs(void) | |
2102 | { | |
2103 | gfs2_root = debugfs_create_dir("gfs2", NULL); | |
2104 | return gfs2_root ? 0 : -ENOMEM; | |
2105 | } | |
2106 | ||
2107 | void gfs2_unregister_debugfs(void) | |
2108 | { | |
2109 | debugfs_remove(gfs2_root); | |
5f882096 | 2110 | gfs2_root = NULL; |
7c52b166 | 2111 | } |