]>
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 | ||
d77d1b58 JP |
10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
11 | ||
b3b94faa DT |
12 | #include <linux/sched.h> |
13 | #include <linux/slab.h> | |
14 | #include <linux/spinlock.h> | |
b3b94faa DT |
15 | #include <linux/buffer_head.h> |
16 | #include <linux/delay.h> | |
17 | #include <linux/sort.h> | |
18 | #include <linux/jhash.h> | |
d0dc80db | 19 | #include <linux/kallsyms.h> |
5c676f6d | 20 | #include <linux/gfs2_ondisk.h> |
24264434 | 21 | #include <linux/list.h> |
fee852e3 | 22 | #include <linux/wait.h> |
95d97b7d | 23 | #include <linux/module.h> |
7c0f6ba6 | 24 | #include <linux/uaccess.h> |
7c52b166 RP |
25 | #include <linux/seq_file.h> |
26 | #include <linux/debugfs.h> | |
8fbbfd21 SW |
27 | #include <linux/kthread.h> |
28 | #include <linux/freezer.h> | |
c4f68a13 BM |
29 | #include <linux/workqueue.h> |
30 | #include <linux/jiffies.h> | |
bc015cb8 SW |
31 | #include <linux/rcupdate.h> |
32 | #include <linux/rculist_bl.h> | |
33 | #include <linux/bit_spinlock.h> | |
a245769f | 34 | #include <linux/percpu.h> |
4506a519 | 35 | #include <linux/list_sort.h> |
e66cf161 | 36 | #include <linux/lockref.h> |
88ffbf3e | 37 | #include <linux/rhashtable.h> |
b3b94faa DT |
38 | |
39 | #include "gfs2.h" | |
5c676f6d | 40 | #include "incore.h" |
b3b94faa DT |
41 | #include "glock.h" |
42 | #include "glops.h" | |
43 | #include "inode.h" | |
b3b94faa DT |
44 | #include "lops.h" |
45 | #include "meta_io.h" | |
46 | #include "quota.h" | |
47 | #include "super.h" | |
5c676f6d | 48 | #include "util.h" |
813e0c46 | 49 | #include "bmap.h" |
63997775 SW |
50 | #define CREATE_TRACE_POINTS |
51 | #include "trace_gfs2.h" | |
b3b94faa | 52 | |
6802e340 | 53 | struct gfs2_glock_iter { |
ba1ddcb6 | 54 | struct gfs2_sbd *sdp; /* incore superblock */ |
88ffbf3e | 55 | struct rhashtable_iter hti; /* rhashtable iterator */ |
ba1ddcb6 SW |
56 | struct gfs2_glock *gl; /* current glock struct */ |
57 | loff_t last_pos; /* last position */ | |
7c52b166 RP |
58 | }; |
59 | ||
b3b94faa DT |
60 | typedef void (*glock_examiner) (struct gfs2_glock * gl); |
61 | ||
6802e340 | 62 | static void do_xmote(struct gfs2_glock *gl, struct gfs2_holder *gh, unsigned int target); |
c4f68a13 | 63 | |
7c52b166 | 64 | static struct dentry *gfs2_root; |
c4f68a13 | 65 | static struct workqueue_struct *glock_workqueue; |
b94a170e | 66 | struct workqueue_struct *gfs2_delete_workqueue; |
97cc1025 SW |
67 | static LIST_HEAD(lru_list); |
68 | static atomic_t lru_count = ATOMIC_INIT(0); | |
eb8374e7 | 69 | static DEFINE_SPINLOCK(lru_lock); |
08bc2dbc | 70 | |
b6397893 | 71 | #define GFS2_GL_HASH_SHIFT 15 |
47a9a527 | 72 | #define GFS2_GL_HASH_SIZE BIT(GFS2_GL_HASH_SHIFT) |
087efdd3 | 73 | |
88ffbf3e BP |
74 | static struct rhashtable_params ht_parms = { |
75 | .nelem_hint = GFS2_GL_HASH_SIZE * 3 / 4, | |
76 | .key_len = sizeof(struct lm_lockname), | |
77 | .key_offset = offsetof(struct gfs2_glock, gl_name), | |
78 | .head_offset = offsetof(struct gfs2_glock, gl_node), | |
79 | }; | |
b3b94faa | 80 | |
88ffbf3e | 81 | static struct rhashtable gl_hash_table; |
b3b94faa | 82 | |
88ffbf3e | 83 | void gfs2_glock_free(struct gfs2_glock *gl) |
b3b94faa | 84 | { |
88ffbf3e | 85 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
b3b94faa | 86 | |
dba2d70c | 87 | if (gl->gl_ops->go_flags & GLOF_ASPACE) { |
bc015cb8 | 88 | kmem_cache_free(gfs2_glock_aspace_cachep, gl); |
dba2d70c | 89 | } else { |
4e2f8849 | 90 | kfree(gl->gl_lksb.sb_lvbptr); |
bc015cb8 | 91 | kmem_cache_free(gfs2_glock_cachep, gl); |
dba2d70c | 92 | } |
bc015cb8 SW |
93 | if (atomic_dec_and_test(&sdp->sd_glock_disposal)) |
94 | wake_up(&sdp->sd_glock_wait); | |
b3b94faa DT |
95 | } |
96 | ||
97 | /** | |
98 | * gfs2_glock_hold() - increment reference count on glock | |
99 | * @gl: The glock to hold | |
100 | * | |
101 | */ | |
102 | ||
e66cf161 | 103 | static void gfs2_glock_hold(struct gfs2_glock *gl) |
b3b94faa | 104 | { |
e66cf161 SW |
105 | GLOCK_BUG_ON(gl, __lockref_is_dead(&gl->gl_lockref)); |
106 | lockref_get(&gl->gl_lockref); | |
b3b94faa DT |
107 | } |
108 | ||
8ff22a6f BM |
109 | /** |
110 | * demote_ok - Check to see if it's ok to unlock a glock | |
111 | * @gl: the glock | |
112 | * | |
113 | * Returns: 1 if it's ok | |
114 | */ | |
115 | ||
116 | static int demote_ok(const struct gfs2_glock *gl) | |
117 | { | |
118 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
119 | ||
120 | if (gl->gl_state == LM_ST_UNLOCKED) | |
121 | return 0; | |
f42ab085 | 122 | if (!list_empty(&gl->gl_holders)) |
8ff22a6f BM |
123 | return 0; |
124 | if (glops->go_demote_ok) | |
125 | return glops->go_demote_ok(gl); | |
126 | return 1; | |
127 | } | |
128 | ||
bc015cb8 | 129 | |
29687a2a SW |
130 | void gfs2_glock_add_to_lru(struct gfs2_glock *gl) |
131 | { | |
132 | spin_lock(&lru_lock); | |
133 | ||
134 | if (!list_empty(&gl->gl_lru)) | |
135 | list_del_init(&gl->gl_lru); | |
136 | else | |
137 | atomic_inc(&lru_count); | |
138 | ||
139 | list_add_tail(&gl->gl_lru, &lru_list); | |
627c10b7 | 140 | set_bit(GLF_LRU, &gl->gl_flags); |
29687a2a SW |
141 | spin_unlock(&lru_lock); |
142 | } | |
143 | ||
8f6cb409 | 144 | static void gfs2_glock_remove_from_lru(struct gfs2_glock *gl) |
f42ab085 | 145 | { |
8f6cb409 | 146 | spin_lock(&lru_lock); |
f42ab085 SW |
147 | if (!list_empty(&gl->gl_lru)) { |
148 | list_del_init(&gl->gl_lru); | |
149 | atomic_dec(&lru_count); | |
150 | clear_bit(GLF_LRU, &gl->gl_flags); | |
151 | } | |
152 | spin_unlock(&lru_lock); | |
153 | } | |
154 | ||
b3b94faa DT |
155 | /** |
156 | * gfs2_glock_put() - Decrement reference count on glock | |
157 | * @gl: The glock to put | |
158 | * | |
159 | */ | |
160 | ||
bc015cb8 | 161 | void gfs2_glock_put(struct gfs2_glock *gl) |
b3b94faa | 162 | { |
15562c43 | 163 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
bc015cb8 | 164 | struct address_space *mapping = gfs2_glock2aspace(gl); |
b3b94faa | 165 | |
e66cf161 SW |
166 | if (lockref_put_or_lock(&gl->gl_lockref)) |
167 | return; | |
168 | ||
169 | lockref_mark_dead(&gl->gl_lockref); | |
170 | ||
8f6cb409 | 171 | gfs2_glock_remove_from_lru(gl); |
e66cf161 | 172 | spin_unlock(&gl->gl_lockref.lock); |
88ffbf3e | 173 | rhashtable_remove_fast(&gl_hash_table, &gl->gl_node, ht_parms); |
e66cf161 SW |
174 | GLOCK_BUG_ON(gl, !list_empty(&gl->gl_holders)); |
175 | GLOCK_BUG_ON(gl, mapping && mapping->nrpages); | |
176 | trace_gfs2_glock_put(gl); | |
177 | sdp->sd_lockstruct.ls_ops->lm_put_lock(gl); | |
b3b94faa DT |
178 | } |
179 | ||
6802e340 SW |
180 | /** |
181 | * may_grant - check if its ok to grant a new lock | |
182 | * @gl: The glock | |
183 | * @gh: The lock request which we wish to grant | |
184 | * | |
185 | * Returns: true if its ok to grant the lock | |
186 | */ | |
187 | ||
188 | static inline int may_grant(const struct gfs2_glock *gl, const struct gfs2_holder *gh) | |
189 | { | |
190 | const struct gfs2_holder *gh_head = list_entry(gl->gl_holders.next, const struct gfs2_holder, gh_list); | |
191 | if ((gh->gh_state == LM_ST_EXCLUSIVE || | |
192 | gh_head->gh_state == LM_ST_EXCLUSIVE) && gh != gh_head) | |
193 | return 0; | |
194 | if (gl->gl_state == gh->gh_state) | |
195 | return 1; | |
196 | if (gh->gh_flags & GL_EXACT) | |
197 | return 0; | |
209806ab SW |
198 | if (gl->gl_state == LM_ST_EXCLUSIVE) { |
199 | if (gh->gh_state == LM_ST_SHARED && gh_head->gh_state == LM_ST_SHARED) | |
200 | return 1; | |
201 | if (gh->gh_state == LM_ST_DEFERRED && gh_head->gh_state == LM_ST_DEFERRED) | |
202 | return 1; | |
203 | } | |
6802e340 SW |
204 | if (gl->gl_state != LM_ST_UNLOCKED && (gh->gh_flags & LM_FLAG_ANY)) |
205 | return 1; | |
206 | return 0; | |
207 | } | |
208 | ||
209 | static void gfs2_holder_wake(struct gfs2_holder *gh) | |
210 | { | |
211 | clear_bit(HIF_WAIT, &gh->gh_iflags); | |
4e857c58 | 212 | smp_mb__after_atomic(); |
6802e340 SW |
213 | wake_up_bit(&gh->gh_iflags, HIF_WAIT); |
214 | } | |
215 | ||
d5341a92 SW |
216 | /** |
217 | * do_error - Something unexpected has happened during a lock request | |
218 | * | |
219 | */ | |
220 | ||
a527b38e | 221 | static void do_error(struct gfs2_glock *gl, const int ret) |
d5341a92 SW |
222 | { |
223 | struct gfs2_holder *gh, *tmp; | |
224 | ||
225 | list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) { | |
226 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
227 | continue; | |
228 | if (ret & LM_OUT_ERROR) | |
229 | gh->gh_error = -EIO; | |
230 | else if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) | |
231 | gh->gh_error = GLR_TRYFAILED; | |
232 | else | |
233 | continue; | |
234 | list_del_init(&gh->gh_list); | |
235 | trace_gfs2_glock_queue(gh, 0); | |
236 | gfs2_holder_wake(gh); | |
237 | } | |
238 | } | |
239 | ||
6802e340 SW |
240 | /** |
241 | * do_promote - promote as many requests as possible on the current queue | |
242 | * @gl: The glock | |
243 | * | |
813e0c46 SW |
244 | * Returns: 1 if there is a blocked holder at the head of the list, or 2 |
245 | * if a type specific operation is underway. | |
6802e340 SW |
246 | */ |
247 | ||
248 | static int do_promote(struct gfs2_glock *gl) | |
f3dd1649 AG |
249 | __releases(&gl->gl_lockref.lock) |
250 | __acquires(&gl->gl_lockref.lock) | |
6802e340 SW |
251 | { |
252 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
253 | struct gfs2_holder *gh, *tmp; | |
254 | int ret; | |
255 | ||
256 | restart: | |
257 | list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) { | |
258 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
259 | continue; | |
260 | if (may_grant(gl, gh)) { | |
261 | if (gh->gh_list.prev == &gl->gl_holders && | |
262 | glops->go_lock) { | |
f3dd1649 | 263 | spin_unlock(&gl->gl_lockref.lock); |
6802e340 SW |
264 | /* FIXME: eliminate this eventually */ |
265 | ret = glops->go_lock(gh); | |
f3dd1649 | 266 | spin_lock(&gl->gl_lockref.lock); |
6802e340 | 267 | if (ret) { |
813e0c46 SW |
268 | if (ret == 1) |
269 | return 2; | |
6802e340 SW |
270 | gh->gh_error = ret; |
271 | list_del_init(&gh->gh_list); | |
63997775 | 272 | trace_gfs2_glock_queue(gh, 0); |
6802e340 SW |
273 | gfs2_holder_wake(gh); |
274 | goto restart; | |
275 | } | |
276 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
63997775 | 277 | trace_gfs2_promote(gh, 1); |
6802e340 SW |
278 | gfs2_holder_wake(gh); |
279 | goto restart; | |
280 | } | |
281 | set_bit(HIF_HOLDER, &gh->gh_iflags); | |
63997775 | 282 | trace_gfs2_promote(gh, 0); |
6802e340 SW |
283 | gfs2_holder_wake(gh); |
284 | continue; | |
285 | } | |
286 | if (gh->gh_list.prev == &gl->gl_holders) | |
287 | return 1; | |
d5341a92 | 288 | do_error(gl, 0); |
6802e340 SW |
289 | break; |
290 | } | |
291 | return 0; | |
292 | } | |
293 | ||
6802e340 SW |
294 | /** |
295 | * find_first_waiter - find the first gh that's waiting for the glock | |
296 | * @gl: the glock | |
297 | */ | |
298 | ||
299 | static inline struct gfs2_holder *find_first_waiter(const struct gfs2_glock *gl) | |
300 | { | |
301 | struct gfs2_holder *gh; | |
302 | ||
303 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
304 | if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
305 | return gh; | |
306 | } | |
307 | return NULL; | |
308 | } | |
309 | ||
310 | /** | |
311 | * state_change - record that the glock is now in a different state | |
312 | * @gl: the glock | |
313 | * @new_state the new state | |
314 | * | |
315 | */ | |
316 | ||
317 | static void state_change(struct gfs2_glock *gl, unsigned int new_state) | |
318 | { | |
319 | int held1, held2; | |
320 | ||
321 | held1 = (gl->gl_state != LM_ST_UNLOCKED); | |
322 | held2 = (new_state != LM_ST_UNLOCKED); | |
323 | ||
324 | if (held1 != held2) { | |
e66cf161 | 325 | GLOCK_BUG_ON(gl, __lockref_is_dead(&gl->gl_lockref)); |
6802e340 | 326 | if (held2) |
e66cf161 | 327 | gl->gl_lockref.count++; |
6802e340 | 328 | else |
e66cf161 | 329 | gl->gl_lockref.count--; |
6802e340 | 330 | } |
7b5e3d5f SW |
331 | if (held1 && held2 && list_empty(&gl->gl_holders)) |
332 | clear_bit(GLF_QUEUED, &gl->gl_flags); | |
6802e340 | 333 | |
7cf8dcd3 BP |
334 | if (new_state != gl->gl_target) |
335 | /* shorten our minimum hold time */ | |
336 | gl->gl_hold_time = max(gl->gl_hold_time - GL_GLOCK_HOLD_DECR, | |
337 | GL_GLOCK_MIN_HOLD); | |
6802e340 SW |
338 | gl->gl_state = new_state; |
339 | gl->gl_tchange = jiffies; | |
340 | } | |
341 | ||
342 | static void gfs2_demote_wake(struct gfs2_glock *gl) | |
343 | { | |
344 | gl->gl_demote_state = LM_ST_EXCLUSIVE; | |
345 | clear_bit(GLF_DEMOTE, &gl->gl_flags); | |
4e857c58 | 346 | smp_mb__after_atomic(); |
6802e340 SW |
347 | wake_up_bit(&gl->gl_flags, GLF_DEMOTE); |
348 | } | |
349 | ||
350 | /** | |
351 | * finish_xmote - The DLM has replied to one of our lock requests | |
352 | * @gl: The glock | |
353 | * @ret: The status from the DLM | |
354 | * | |
355 | */ | |
356 | ||
357 | static void finish_xmote(struct gfs2_glock *gl, unsigned int ret) | |
358 | { | |
359 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
360 | struct gfs2_holder *gh; | |
361 | unsigned state = ret & LM_OUT_ST_MASK; | |
813e0c46 | 362 | int rv; |
6802e340 | 363 | |
f3dd1649 | 364 | spin_lock(&gl->gl_lockref.lock); |
63997775 | 365 | trace_gfs2_glock_state_change(gl, state); |
6802e340 SW |
366 | state_change(gl, state); |
367 | gh = find_first_waiter(gl); | |
368 | ||
369 | /* Demote to UN request arrived during demote to SH or DF */ | |
370 | if (test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags) && | |
371 | state != LM_ST_UNLOCKED && gl->gl_demote_state == LM_ST_UNLOCKED) | |
372 | gl->gl_target = LM_ST_UNLOCKED; | |
373 | ||
374 | /* Check for state != intended state */ | |
375 | if (unlikely(state != gl->gl_target)) { | |
376 | if (gh && !test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)) { | |
377 | /* move to back of queue and try next entry */ | |
378 | if (ret & LM_OUT_CANCELED) { | |
379 | if ((gh->gh_flags & LM_FLAG_PRIORITY) == 0) | |
380 | list_move_tail(&gh->gh_list, &gl->gl_holders); | |
381 | gh = find_first_waiter(gl); | |
382 | gl->gl_target = gh->gh_state; | |
383 | goto retry; | |
384 | } | |
385 | /* Some error or failed "try lock" - report it */ | |
386 | if ((ret & LM_OUT_ERROR) || | |
387 | (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) { | |
388 | gl->gl_target = gl->gl_state; | |
389 | do_error(gl, ret); | |
390 | goto out; | |
391 | } | |
392 | } | |
393 | switch(state) { | |
394 | /* Unlocked due to conversion deadlock, try again */ | |
395 | case LM_ST_UNLOCKED: | |
396 | retry: | |
397 | do_xmote(gl, gh, gl->gl_target); | |
398 | break; | |
399 | /* Conversion fails, unlock and try again */ | |
400 | case LM_ST_SHARED: | |
401 | case LM_ST_DEFERRED: | |
402 | do_xmote(gl, gh, LM_ST_UNLOCKED); | |
403 | break; | |
404 | default: /* Everything else */ | |
d77d1b58 | 405 | pr_err("wanted %u got %u\n", gl->gl_target, state); |
6802e340 SW |
406 | GLOCK_BUG_ON(gl, 1); |
407 | } | |
f3dd1649 | 408 | spin_unlock(&gl->gl_lockref.lock); |
6802e340 SW |
409 | return; |
410 | } | |
411 | ||
412 | /* Fast path - we got what we asked for */ | |
413 | if (test_and_clear_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)) | |
414 | gfs2_demote_wake(gl); | |
415 | if (state != LM_ST_UNLOCKED) { | |
416 | if (glops->go_xmote_bh) { | |
f3dd1649 | 417 | spin_unlock(&gl->gl_lockref.lock); |
6802e340 | 418 | rv = glops->go_xmote_bh(gl, gh); |
f3dd1649 | 419 | spin_lock(&gl->gl_lockref.lock); |
6802e340 SW |
420 | if (rv) { |
421 | do_error(gl, rv); | |
422 | goto out; | |
423 | } | |
424 | } | |
813e0c46 SW |
425 | rv = do_promote(gl); |
426 | if (rv == 2) | |
427 | goto out_locked; | |
6802e340 SW |
428 | } |
429 | out: | |
430 | clear_bit(GLF_LOCK, &gl->gl_flags); | |
813e0c46 | 431 | out_locked: |
f3dd1649 | 432 | spin_unlock(&gl->gl_lockref.lock); |
6802e340 SW |
433 | } |
434 | ||
6802e340 SW |
435 | /** |
436 | * do_xmote - Calls the DLM to change the state of a lock | |
437 | * @gl: The lock state | |
438 | * @gh: The holder (only for promotes) | |
439 | * @target: The target lock state | |
440 | * | |
441 | */ | |
442 | ||
443 | static void do_xmote(struct gfs2_glock *gl, struct gfs2_holder *gh, unsigned int target) | |
f3dd1649 AG |
444 | __releases(&gl->gl_lockref.lock) |
445 | __acquires(&gl->gl_lockref.lock) | |
6802e340 SW |
446 | { |
447 | const struct gfs2_glock_operations *glops = gl->gl_ops; | |
15562c43 | 448 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
b58bf407 | 449 | unsigned int lck_flags = (unsigned int)(gh ? gh->gh_flags : 0); |
6802e340 SW |
450 | int ret; |
451 | ||
452 | lck_flags &= (LM_FLAG_TRY | LM_FLAG_TRY_1CB | LM_FLAG_NOEXP | | |
453 | LM_FLAG_PRIORITY); | |
921169ca SW |
454 | GLOCK_BUG_ON(gl, gl->gl_state == target); |
455 | GLOCK_BUG_ON(gl, gl->gl_state == gl->gl_target); | |
6802e340 SW |
456 | if ((target == LM_ST_UNLOCKED || target == LM_ST_DEFERRED) && |
457 | glops->go_inval) { | |
458 | set_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags); | |
459 | do_error(gl, 0); /* Fail queued try locks */ | |
460 | } | |
47a25380 | 461 | gl->gl_req = target; |
a245769f SW |
462 | set_bit(GLF_BLOCKING, &gl->gl_flags); |
463 | if ((gl->gl_req == LM_ST_UNLOCKED) || | |
464 | (gl->gl_state == LM_ST_EXCLUSIVE) || | |
465 | (lck_flags & (LM_FLAG_TRY|LM_FLAG_TRY_1CB))) | |
466 | clear_bit(GLF_BLOCKING, &gl->gl_flags); | |
f3dd1649 | 467 | spin_unlock(&gl->gl_lockref.lock); |
06dfc306 BP |
468 | if (glops->go_sync) |
469 | glops->go_sync(gl); | |
6802e340 SW |
470 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags)) |
471 | glops->go_inval(gl, target == LM_ST_DEFERRED ? 0 : DIO_METADATA); | |
472 | clear_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags); | |
473 | ||
474 | gfs2_glock_hold(gl); | |
921169ca SW |
475 | if (sdp->sd_lockstruct.ls_ops->lm_lock) { |
476 | /* lock_dlm */ | |
477 | ret = sdp->sd_lockstruct.ls_ops->lm_lock(gl, target, lck_flags); | |
3e11e530 BM |
478 | if (ret == -EINVAL && gl->gl_target == LM_ST_UNLOCKED && |
479 | target == LM_ST_UNLOCKED && | |
480 | test_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags)) { | |
481 | finish_xmote(gl, target); | |
482 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) | |
483 | gfs2_glock_put(gl); | |
484 | } | |
485 | else if (ret) { | |
d77d1b58 | 486 | pr_err("lm_lock ret %d\n", ret); |
dba2d70c DT |
487 | GLOCK_BUG_ON(gl, 1); |
488 | } | |
921169ca SW |
489 | } else { /* lock_nolock */ |
490 | finish_xmote(gl, target); | |
6802e340 SW |
491 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
492 | gfs2_glock_put(gl); | |
6802e340 | 493 | } |
921169ca | 494 | |
f3dd1649 | 495 | spin_lock(&gl->gl_lockref.lock); |
6802e340 SW |
496 | } |
497 | ||
498 | /** | |
499 | * find_first_holder - find the first "holder" gh | |
500 | * @gl: the glock | |
501 | */ | |
502 | ||
503 | static inline struct gfs2_holder *find_first_holder(const struct gfs2_glock *gl) | |
504 | { | |
505 | struct gfs2_holder *gh; | |
506 | ||
507 | if (!list_empty(&gl->gl_holders)) { | |
508 | gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list); | |
509 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
510 | return gh; | |
511 | } | |
512 | return NULL; | |
513 | } | |
514 | ||
515 | /** | |
516 | * run_queue - do all outstanding tasks related to a glock | |
517 | * @gl: The glock in question | |
518 | * @nonblock: True if we must not block in run_queue | |
519 | * | |
520 | */ | |
521 | ||
522 | static void run_queue(struct gfs2_glock *gl, const int nonblock) | |
f3dd1649 AG |
523 | __releases(&gl->gl_lockref.lock) |
524 | __acquires(&gl->gl_lockref.lock) | |
6802e340 SW |
525 | { |
526 | struct gfs2_holder *gh = NULL; | |
813e0c46 | 527 | int ret; |
6802e340 SW |
528 | |
529 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) | |
530 | return; | |
531 | ||
532 | GLOCK_BUG_ON(gl, test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)); | |
533 | ||
534 | if (test_bit(GLF_DEMOTE, &gl->gl_flags) && | |
535 | gl->gl_demote_state != gl->gl_state) { | |
536 | if (find_first_holder(gl)) | |
d8348de0 | 537 | goto out_unlock; |
6802e340 SW |
538 | if (nonblock) |
539 | goto out_sched; | |
540 | set_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags); | |
265d529c | 541 | GLOCK_BUG_ON(gl, gl->gl_demote_state == LM_ST_EXCLUSIVE); |
6802e340 SW |
542 | gl->gl_target = gl->gl_demote_state; |
543 | } else { | |
544 | if (test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
545 | gfs2_demote_wake(gl); | |
813e0c46 SW |
546 | ret = do_promote(gl); |
547 | if (ret == 0) | |
d8348de0 | 548 | goto out_unlock; |
813e0c46 | 549 | if (ret == 2) |
a228df63 | 550 | goto out; |
6802e340 SW |
551 | gh = find_first_waiter(gl); |
552 | gl->gl_target = gh->gh_state; | |
553 | if (!(gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) | |
554 | do_error(gl, 0); /* Fail queued try locks */ | |
555 | } | |
556 | do_xmote(gl, gh, gl->gl_target); | |
a228df63 | 557 | out: |
6802e340 SW |
558 | return; |
559 | ||
560 | out_sched: | |
7e71c55e | 561 | clear_bit(GLF_LOCK, &gl->gl_flags); |
4e857c58 | 562 | smp_mb__after_atomic(); |
e66cf161 | 563 | gl->gl_lockref.count++; |
6802e340 | 564 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
e66cf161 | 565 | gl->gl_lockref.count--; |
7e71c55e SW |
566 | return; |
567 | ||
d8348de0 | 568 | out_unlock: |
6802e340 | 569 | clear_bit(GLF_LOCK, &gl->gl_flags); |
4e857c58 | 570 | smp_mb__after_atomic(); |
7e71c55e | 571 | return; |
6802e340 SW |
572 | } |
573 | ||
b94a170e BM |
574 | static void delete_work_func(struct work_struct *work) |
575 | { | |
576 | struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_delete); | |
15562c43 | 577 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
ec5ec66b | 578 | struct inode *inode; |
044b9414 SW |
579 | u64 no_addr = gl->gl_name.ln_number; |
580 | ||
a4923865 BP |
581 | /* If someone's using this glock to create a new dinode, the block must |
582 | have been freed by another node, then re-used, in which case our | |
583 | iopen callback is too late after the fact. Ignore it. */ | |
584 | if (test_bit(GLF_INODE_CREATING, &gl->gl_flags)) | |
585 | goto out; | |
586 | ||
ec5ec66b | 587 | inode = gfs2_lookup_by_inum(sdp, no_addr, NULL, GFS2_BLKST_UNLINKED); |
044b9414 SW |
588 | if (inode && !IS_ERR(inode)) { |
589 | d_prune_aliases(inode); | |
590 | iput(inode); | |
b94a170e | 591 | } |
a4923865 | 592 | out: |
b94a170e BM |
593 | gfs2_glock_put(gl); |
594 | } | |
595 | ||
c4f68a13 BM |
596 | static void glock_work_func(struct work_struct *work) |
597 | { | |
6802e340 | 598 | unsigned long delay = 0; |
c4f68a13 | 599 | struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_work.work); |
26bb7505 | 600 | int drop_ref = 0; |
c4f68a13 | 601 | |
26bb7505 | 602 | if (test_and_clear_bit(GLF_REPLY_PENDING, &gl->gl_flags)) { |
6802e340 | 603 | finish_xmote(gl, gl->gl_reply); |
26bb7505 SW |
604 | drop_ref = 1; |
605 | } | |
f3dd1649 | 606 | spin_lock(&gl->gl_lockref.lock); |
f90e5b5b | 607 | if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && |
265d529c SW |
608 | gl->gl_state != LM_ST_UNLOCKED && |
609 | gl->gl_demote_state != LM_ST_EXCLUSIVE) { | |
6802e340 | 610 | unsigned long holdtime, now = jiffies; |
f90e5b5b | 611 | |
7cf8dcd3 | 612 | holdtime = gl->gl_tchange + gl->gl_hold_time; |
6802e340 SW |
613 | if (time_before(now, holdtime)) |
614 | delay = holdtime - now; | |
f90e5b5b BP |
615 | |
616 | if (!delay) { | |
617 | clear_bit(GLF_PENDING_DEMOTE, &gl->gl_flags); | |
618 | set_bit(GLF_DEMOTE, &gl->gl_flags); | |
619 | } | |
6802e340 SW |
620 | } |
621 | run_queue(gl, 0); | |
f3dd1649 | 622 | spin_unlock(&gl->gl_lockref.lock); |
7cf8dcd3 | 623 | if (!delay) |
6802e340 | 624 | gfs2_glock_put(gl); |
7cf8dcd3 BP |
625 | else { |
626 | if (gl->gl_name.ln_type != LM_TYPE_INODE) | |
627 | delay = 0; | |
628 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0) | |
629 | gfs2_glock_put(gl); | |
630 | } | |
26bb7505 SW |
631 | if (drop_ref) |
632 | gfs2_glock_put(gl); | |
c4f68a13 BM |
633 | } |
634 | ||
b3b94faa DT |
635 | /** |
636 | * gfs2_glock_get() - Get a glock, or create one if one doesn't exist | |
637 | * @sdp: The GFS2 superblock | |
638 | * @number: the lock number | |
639 | * @glops: The glock_operations to use | |
640 | * @create: If 0, don't create the glock if it doesn't exist | |
641 | * @glp: the glock is returned here | |
642 | * | |
643 | * This does not lock a glock, just finds/creates structures for one. | |
644 | * | |
645 | * Returns: errno | |
646 | */ | |
647 | ||
cd915493 | 648 | int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 | 649 | const struct gfs2_glock_operations *glops, int create, |
b3b94faa DT |
650 | struct gfs2_glock **glp) |
651 | { | |
009d8518 | 652 | struct super_block *s = sdp->sd_vfs; |
15562c43 BP |
653 | struct lm_lockname name = { .ln_number = number, |
654 | .ln_type = glops->go_type, | |
655 | .ln_sbd = sdp }; | |
88ffbf3e | 656 | struct gfs2_glock *gl, *tmp = NULL; |
009d8518 | 657 | struct address_space *mapping; |
bc015cb8 | 658 | struct kmem_cache *cachep; |
88ffbf3e | 659 | int ret, tries = 0; |
b3b94faa | 660 | |
f38e5fb9 | 661 | rcu_read_lock(); |
88ffbf3e BP |
662 | gl = rhashtable_lookup_fast(&gl_hash_table, &name, ht_parms); |
663 | if (gl && !lockref_get_not_dead(&gl->gl_lockref)) | |
664 | gl = NULL; | |
f38e5fb9 | 665 | rcu_read_unlock(); |
b3b94faa | 666 | |
64d576ba SW |
667 | *glp = gl; |
668 | if (gl) | |
b3b94faa | 669 | return 0; |
64d576ba SW |
670 | if (!create) |
671 | return -ENOENT; | |
b3b94faa | 672 | |
009d8518 | 673 | if (glops->go_flags & GLOF_ASPACE) |
bc015cb8 | 674 | cachep = gfs2_glock_aspace_cachep; |
009d8518 | 675 | else |
bc015cb8 | 676 | cachep = gfs2_glock_cachep; |
fe0bbd29 | 677 | gl = kmem_cache_alloc(cachep, GFP_NOFS); |
b3b94faa DT |
678 | if (!gl) |
679 | return -ENOMEM; | |
680 | ||
dba2d70c | 681 | memset(&gl->gl_lksb, 0, sizeof(struct dlm_lksb)); |
dba2d70c DT |
682 | |
683 | if (glops->go_flags & GLOF_LVB) { | |
fe0bbd29 | 684 | gl->gl_lksb.sb_lvbptr = kzalloc(GFS2_MIN_LVB_SIZE, GFP_NOFS); |
4e2f8849 | 685 | if (!gl->gl_lksb.sb_lvbptr) { |
dba2d70c DT |
686 | kmem_cache_free(cachep, gl); |
687 | return -ENOMEM; | |
688 | } | |
dba2d70c DT |
689 | } |
690 | ||
8f05228e | 691 | atomic_inc(&sdp->sd_glock_disposal); |
88ffbf3e | 692 | gl->gl_node.next = NULL; |
ec45d9f5 | 693 | gl->gl_flags = 0; |
b3b94faa | 694 | gl->gl_name = name; |
e66cf161 | 695 | gl->gl_lockref.count = 1; |
b3b94faa | 696 | gl->gl_state = LM_ST_UNLOCKED; |
6802e340 | 697 | gl->gl_target = LM_ST_UNLOCKED; |
c4f68a13 | 698 | gl->gl_demote_state = LM_ST_EXCLUSIVE; |
b3b94faa | 699 | gl->gl_ops = glops; |
8b0e1953 | 700 | gl->gl_dstamp = 0; |
a245769f SW |
701 | preempt_disable(); |
702 | /* We use the global stats to estimate the initial per-glock stats */ | |
703 | gl->gl_stats = this_cpu_ptr(sdp->sd_lkstats)->lkstats[glops->go_type]; | |
704 | preempt_enable(); | |
705 | gl->gl_stats.stats[GFS2_LKS_DCOUNT] = 0; | |
706 | gl->gl_stats.stats[GFS2_LKS_QCOUNT] = 0; | |
c4f68a13 | 707 | gl->gl_tchange = jiffies; |
ec45d9f5 | 708 | gl->gl_object = NULL; |
7cf8dcd3 | 709 | gl->gl_hold_time = GL_GLOCK_DFT_HOLD; |
c4f68a13 | 710 | INIT_DELAYED_WORK(&gl->gl_work, glock_work_func); |
b94a170e | 711 | INIT_WORK(&gl->gl_delete, delete_work_func); |
b3b94faa | 712 | |
009d8518 SW |
713 | mapping = gfs2_glock2aspace(gl); |
714 | if (mapping) { | |
715 | mapping->a_ops = &gfs2_meta_aops; | |
716 | mapping->host = s->s_bdev->bd_inode; | |
717 | mapping->flags = 0; | |
718 | mapping_set_gfp_mask(mapping, GFP_NOFS); | |
252aa6f5 | 719 | mapping->private_data = NULL; |
009d8518 | 720 | mapping->writeback_index = 0; |
b3b94faa DT |
721 | } |
722 | ||
88ffbf3e BP |
723 | again: |
724 | ret = rhashtable_lookup_insert_fast(&gl_hash_table, &gl->gl_node, | |
725 | ht_parms); | |
726 | if (ret == 0) { | |
727 | *glp = gl; | |
728 | return 0; | |
b3b94faa DT |
729 | } |
730 | ||
88ffbf3e BP |
731 | if (ret == -EEXIST) { |
732 | ret = 0; | |
f38e5fb9 | 733 | rcu_read_lock(); |
88ffbf3e BP |
734 | tmp = rhashtable_lookup_fast(&gl_hash_table, &name, ht_parms); |
735 | if (tmp == NULL || !lockref_get_not_dead(&tmp->gl_lockref)) { | |
736 | if (++tries < 100) { | |
f38e5fb9 | 737 | rcu_read_unlock(); |
88ffbf3e BP |
738 | cond_resched(); |
739 | goto again; | |
740 | } | |
741 | tmp = NULL; | |
742 | ret = -ENOMEM; | |
743 | } | |
f38e5fb9 | 744 | rcu_read_unlock(); |
88ffbf3e BP |
745 | } else { |
746 | WARN_ON_ONCE(ret); | |
747 | } | |
748 | kfree(gl->gl_lksb.sb_lvbptr); | |
749 | kmem_cache_free(cachep, gl); | |
750 | atomic_dec(&sdp->sd_glock_disposal); | |
751 | *glp = tmp; | |
b3b94faa | 752 | |
88ffbf3e | 753 | return ret; |
b3b94faa DT |
754 | } |
755 | ||
756 | /** | |
757 | * gfs2_holder_init - initialize a struct gfs2_holder in the default way | |
758 | * @gl: the glock | |
759 | * @state: the state we're requesting | |
760 | * @flags: the modifier flags | |
761 | * @gh: the holder structure | |
762 | * | |
763 | */ | |
764 | ||
b58bf407 | 765 | void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, u16 flags, |
b3b94faa DT |
766 | struct gfs2_holder *gh) |
767 | { | |
768 | INIT_LIST_HEAD(&gh->gh_list); | |
769 | gh->gh_gl = gl; | |
d29c0afe | 770 | gh->gh_ip = _RET_IP_; |
b1e058da | 771 | gh->gh_owner_pid = get_pid(task_pid(current)); |
b3b94faa DT |
772 | gh->gh_state = state; |
773 | gh->gh_flags = flags; | |
774 | gh->gh_error = 0; | |
775 | gh->gh_iflags = 0; | |
b3b94faa DT |
776 | gfs2_glock_hold(gl); |
777 | } | |
778 | ||
779 | /** | |
780 | * gfs2_holder_reinit - reinitialize a struct gfs2_holder so we can requeue it | |
781 | * @state: the state we're requesting | |
782 | * @flags: the modifier flags | |
783 | * @gh: the holder structure | |
784 | * | |
785 | * Don't mess with the glock. | |
786 | * | |
787 | */ | |
788 | ||
b58bf407 | 789 | void gfs2_holder_reinit(unsigned int state, u16 flags, struct gfs2_holder *gh) |
b3b94faa DT |
790 | { |
791 | gh->gh_state = state; | |
579b78a4 | 792 | gh->gh_flags = flags; |
3b8249f6 | 793 | gh->gh_iflags = 0; |
d29c0afe | 794 | gh->gh_ip = _RET_IP_; |
30badc95 | 795 | put_pid(gh->gh_owner_pid); |
1a0eae88 | 796 | gh->gh_owner_pid = get_pid(task_pid(current)); |
b3b94faa DT |
797 | } |
798 | ||
799 | /** | |
800 | * gfs2_holder_uninit - uninitialize a holder structure (drop glock reference) | |
801 | * @gh: the holder structure | |
802 | * | |
803 | */ | |
804 | ||
805 | void gfs2_holder_uninit(struct gfs2_holder *gh) | |
806 | { | |
b1e058da | 807 | put_pid(gh->gh_owner_pid); |
b3b94faa | 808 | gfs2_glock_put(gh->gh_gl); |
6df9f9a2 | 809 | gfs2_holder_mark_uninitialized(gh); |
d0dc80db | 810 | gh->gh_ip = 0; |
b3b94faa DT |
811 | } |
812 | ||
07a79049 BP |
813 | /** |
814 | * gfs2_glock_wait - wait on a glock acquisition | |
815 | * @gh: the glock holder | |
816 | * | |
817 | * Returns: 0 on success | |
818 | */ | |
819 | ||
820 | int gfs2_glock_wait(struct gfs2_holder *gh) | |
da755fdb | 821 | { |
7cf8dcd3 BP |
822 | unsigned long time1 = jiffies; |
823 | ||
6802e340 | 824 | might_sleep(); |
74316201 | 825 | wait_on_bit(&gh->gh_iflags, HIF_WAIT, TASK_UNINTERRUPTIBLE); |
7cf8dcd3 BP |
826 | if (time_after(jiffies, time1 + HZ)) /* have we waited > a second? */ |
827 | /* Lengthen the minimum hold time. */ | |
828 | gh->gh_gl->gl_hold_time = min(gh->gh_gl->gl_hold_time + | |
829 | GL_GLOCK_HOLD_INCR, | |
830 | GL_GLOCK_MAX_HOLD); | |
07a79049 | 831 | return gh->gh_error; |
da755fdb SW |
832 | } |
833 | ||
b3b94faa | 834 | /** |
6802e340 SW |
835 | * handle_callback - process a demote request |
836 | * @gl: the glock | |
837 | * @state: the state the caller wants us to change to | |
b3b94faa | 838 | * |
6802e340 SW |
839 | * There are only two requests that we are going to see in actual |
840 | * practise: LM_ST_SHARED and LM_ST_UNLOCKED | |
b3b94faa DT |
841 | */ |
842 | ||
6802e340 | 843 | static void handle_callback(struct gfs2_glock *gl, unsigned int state, |
81ffbf65 | 844 | unsigned long delay, bool remote) |
b3b94faa | 845 | { |
6802e340 | 846 | int bit = delay ? GLF_PENDING_DEMOTE : GLF_DEMOTE; |
b3b94faa | 847 | |
6802e340 SW |
848 | set_bit(bit, &gl->gl_flags); |
849 | if (gl->gl_demote_state == LM_ST_EXCLUSIVE) { | |
850 | gl->gl_demote_state = state; | |
851 | gl->gl_demote_time = jiffies; | |
6802e340 SW |
852 | } else if (gl->gl_demote_state != LM_ST_UNLOCKED && |
853 | gl->gl_demote_state != state) { | |
854 | gl->gl_demote_state = LM_ST_UNLOCKED; | |
b3b94faa | 855 | } |
b94a170e | 856 | if (gl->gl_ops->go_callback) |
81ffbf65 | 857 | gl->gl_ops->go_callback(gl, remote); |
7bd8b2eb | 858 | trace_gfs2_demote_rq(gl, remote); |
b3b94faa DT |
859 | } |
860 | ||
6802e340 | 861 | void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...) |
7c52b166 | 862 | { |
5e69069c | 863 | struct va_format vaf; |
7c52b166 RP |
864 | va_list args; |
865 | ||
866 | va_start(args, fmt); | |
5e69069c | 867 | |
6802e340 | 868 | if (seq) { |
1bb49303 | 869 | seq_vprintf(seq, fmt, args); |
6802e340 | 870 | } else { |
5e69069c JP |
871 | vaf.fmt = fmt; |
872 | vaf.va = &args; | |
873 | ||
d77d1b58 | 874 | pr_err("%pV", &vaf); |
6802e340 | 875 | } |
5e69069c | 876 | |
7c52b166 RP |
877 | va_end(args); |
878 | } | |
879 | ||
b3b94faa DT |
880 | /** |
881 | * add_to_queue - Add a holder to the wait queue (but look for recursion) | |
882 | * @gh: the holder structure to add | |
883 | * | |
6802e340 SW |
884 | * Eventually we should move the recursive locking trap to a |
885 | * debugging option or something like that. This is the fast | |
886 | * path and needs to have the minimum number of distractions. | |
887 | * | |
b3b94faa DT |
888 | */ |
889 | ||
6802e340 | 890 | static inline void add_to_queue(struct gfs2_holder *gh) |
f3dd1649 AG |
891 | __releases(&gl->gl_lockref.lock) |
892 | __acquires(&gl->gl_lockref.lock) | |
b3b94faa DT |
893 | { |
894 | struct gfs2_glock *gl = gh->gh_gl; | |
15562c43 | 895 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
6802e340 SW |
896 | struct list_head *insert_pt = NULL; |
897 | struct gfs2_holder *gh2; | |
e5dc76b9 | 898 | int try_futile = 0; |
b3b94faa | 899 | |
b1e058da | 900 | BUG_ON(gh->gh_owner_pid == NULL); |
fee852e3 SW |
901 | if (test_and_set_bit(HIF_WAIT, &gh->gh_iflags)) |
902 | BUG(); | |
190562bd | 903 | |
6802e340 SW |
904 | if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { |
905 | if (test_bit(GLF_LOCK, &gl->gl_flags)) | |
e5dc76b9 | 906 | try_futile = !may_grant(gl, gh); |
6802e340 SW |
907 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags)) |
908 | goto fail; | |
909 | } | |
910 | ||
911 | list_for_each_entry(gh2, &gl->gl_holders, gh_list) { | |
912 | if (unlikely(gh2->gh_owner_pid == gh->gh_owner_pid && | |
913 | (gh->gh_gl->gl_ops->go_type != LM_TYPE_FLOCK))) | |
914 | goto trap_recursive; | |
e5dc76b9 BP |
915 | if (try_futile && |
916 | !(gh2->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) { | |
6802e340 SW |
917 | fail: |
918 | gh->gh_error = GLR_TRYFAILED; | |
919 | gfs2_holder_wake(gh); | |
920 | return; | |
b4c20166 | 921 | } |
6802e340 SW |
922 | if (test_bit(HIF_HOLDER, &gh2->gh_iflags)) |
923 | continue; | |
924 | if (unlikely((gh->gh_flags & LM_FLAG_PRIORITY) && !insert_pt)) | |
925 | insert_pt = &gh2->gh_list; | |
926 | } | |
7b5e3d5f | 927 | set_bit(GLF_QUEUED, &gl->gl_flags); |
edae38a6 | 928 | trace_gfs2_glock_queue(gh, 1); |
a245769f SW |
929 | gfs2_glstats_inc(gl, GFS2_LKS_QCOUNT); |
930 | gfs2_sbstats_inc(gl, GFS2_LKS_QCOUNT); | |
6802e340 SW |
931 | if (likely(insert_pt == NULL)) { |
932 | list_add_tail(&gh->gh_list, &gl->gl_holders); | |
933 | if (unlikely(gh->gh_flags & LM_FLAG_PRIORITY)) | |
934 | goto do_cancel; | |
935 | return; | |
936 | } | |
937 | list_add_tail(&gh->gh_list, insert_pt); | |
938 | do_cancel: | |
939 | gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list); | |
940 | if (!(gh->gh_flags & LM_FLAG_PRIORITY)) { | |
f3dd1649 | 941 | spin_unlock(&gl->gl_lockref.lock); |
048bca22 | 942 | if (sdp->sd_lockstruct.ls_ops->lm_cancel) |
f057f6cd | 943 | sdp->sd_lockstruct.ls_ops->lm_cancel(gl); |
f3dd1649 | 944 | spin_lock(&gl->gl_lockref.lock); |
b3b94faa | 945 | } |
6802e340 | 946 | return; |
b3b94faa | 947 | |
6802e340 | 948 | trap_recursive: |
fc554ed3 FF |
949 | pr_err("original: %pSR\n", (void *)gh2->gh_ip); |
950 | pr_err("pid: %d\n", pid_nr(gh2->gh_owner_pid)); | |
951 | pr_err("lock type: %d req lock state : %d\n", | |
6802e340 | 952 | gh2->gh_gl->gl_name.ln_type, gh2->gh_state); |
fc554ed3 FF |
953 | pr_err("new: %pSR\n", (void *)gh->gh_ip); |
954 | pr_err("pid: %d\n", pid_nr(gh->gh_owner_pid)); | |
955 | pr_err("lock type: %d req lock state : %d\n", | |
6802e340 | 956 | gh->gh_gl->gl_name.ln_type, gh->gh_state); |
8eae1ca0 | 957 | gfs2_dump_glock(NULL, gl); |
6802e340 | 958 | BUG(); |
b3b94faa DT |
959 | } |
960 | ||
961 | /** | |
962 | * gfs2_glock_nq - enqueue a struct gfs2_holder onto a glock (acquire a glock) | |
963 | * @gh: the holder structure | |
964 | * | |
965 | * if (gh->gh_flags & GL_ASYNC), this never returns an error | |
966 | * | |
967 | * Returns: 0, GLR_TRYFAILED, or errno on failure | |
968 | */ | |
969 | ||
970 | int gfs2_glock_nq(struct gfs2_holder *gh) | |
971 | { | |
972 | struct gfs2_glock *gl = gh->gh_gl; | |
15562c43 | 973 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
b3b94faa DT |
974 | int error = 0; |
975 | ||
6802e340 | 976 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
b3b94faa | 977 | return -EIO; |
b3b94faa | 978 | |
f42ab085 SW |
979 | if (test_bit(GLF_LRU, &gl->gl_flags)) |
980 | gfs2_glock_remove_from_lru(gl); | |
981 | ||
f3dd1649 | 982 | spin_lock(&gl->gl_lockref.lock); |
b3b94faa | 983 | add_to_queue(gh); |
01b172b7 BP |
984 | if (unlikely((LM_FLAG_NOEXP & gh->gh_flags) && |
985 | test_and_clear_bit(GLF_FROZEN, &gl->gl_flags))) { | |
0809f6ec | 986 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
01b172b7 BP |
987 | gl->gl_lockref.count++; |
988 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) | |
989 | gl->gl_lockref.count--; | |
990 | } | |
6802e340 | 991 | run_queue(gl, 1); |
f3dd1649 | 992 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa | 993 | |
6802e340 SW |
994 | if (!(gh->gh_flags & GL_ASYNC)) |
995 | error = gfs2_glock_wait(gh); | |
b3b94faa | 996 | |
b3b94faa DT |
997 | return error; |
998 | } | |
999 | ||
1000 | /** | |
1001 | * gfs2_glock_poll - poll to see if an async request has been completed | |
1002 | * @gh: the holder | |
1003 | * | |
1004 | * Returns: 1 if the request is ready to be gfs2_glock_wait()ed on | |
1005 | */ | |
1006 | ||
1007 | int gfs2_glock_poll(struct gfs2_holder *gh) | |
1008 | { | |
6802e340 | 1009 | return test_bit(HIF_WAIT, &gh->gh_iflags) ? 0 : 1; |
b3b94faa DT |
1010 | } |
1011 | ||
1012 | /** | |
1013 | * gfs2_glock_dq - dequeue a struct gfs2_holder from a glock (release a glock) | |
1014 | * @gh: the glock holder | |
1015 | * | |
1016 | */ | |
1017 | ||
1018 | void gfs2_glock_dq(struct gfs2_holder *gh) | |
1019 | { | |
1020 | struct gfs2_glock *gl = gh->gh_gl; | |
8fb4b536 | 1021 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
c4f68a13 | 1022 | unsigned delay = 0; |
6802e340 | 1023 | int fast_path = 0; |
b3b94faa | 1024 | |
f3dd1649 | 1025 | spin_lock(&gl->gl_lockref.lock); |
b3b94faa | 1026 | if (gh->gh_flags & GL_NOCACHE) |
81ffbf65 | 1027 | handle_callback(gl, LM_ST_UNLOCKED, 0, false); |
b3b94faa | 1028 | |
b3b94faa | 1029 | list_del_init(&gh->gh_list); |
7508abc4 | 1030 | clear_bit(HIF_HOLDER, &gh->gh_iflags); |
6802e340 | 1031 | if (find_first_holder(gl) == NULL) { |
3042a2cc | 1032 | if (glops->go_unlock) { |
6802e340 | 1033 | GLOCK_BUG_ON(gl, test_and_set_bit(GLF_LOCK, &gl->gl_flags)); |
f3dd1649 | 1034 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa | 1035 | glops->go_unlock(gh); |
f3dd1649 | 1036 | spin_lock(&gl->gl_lockref.lock); |
6802e340 | 1037 | clear_bit(GLF_LOCK, &gl->gl_flags); |
3042a2cc | 1038 | } |
6802e340 SW |
1039 | if (list_empty(&gl->gl_holders) && |
1040 | !test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && | |
1041 | !test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
1042 | fast_path = 1; | |
b3b94faa | 1043 | } |
e7ccaf5f BP |
1044 | if (!test_bit(GLF_LFLUSH, &gl->gl_flags) && demote_ok(gl) && |
1045 | (glops->go_flags & GLOF_LRU)) | |
4abb6ad9 BP |
1046 | gfs2_glock_add_to_lru(gl); |
1047 | ||
63997775 | 1048 | trace_gfs2_glock_queue(gh, 0); |
f3dd1649 | 1049 | spin_unlock(&gl->gl_lockref.lock); |
6802e340 SW |
1050 | if (likely(fast_path)) |
1051 | return; | |
c4f68a13 BM |
1052 | |
1053 | gfs2_glock_hold(gl); | |
1054 | if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && | |
7cf8dcd3 BP |
1055 | !test_bit(GLF_DEMOTE, &gl->gl_flags) && |
1056 | gl->gl_name.ln_type == LM_TYPE_INODE) | |
1057 | delay = gl->gl_hold_time; | |
c4f68a13 BM |
1058 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0) |
1059 | gfs2_glock_put(gl); | |
b3b94faa DT |
1060 | } |
1061 | ||
d93cfa98 AD |
1062 | void gfs2_glock_dq_wait(struct gfs2_holder *gh) |
1063 | { | |
1064 | struct gfs2_glock *gl = gh->gh_gl; | |
1065 | gfs2_glock_dq(gh); | |
81e1d450 | 1066 | might_sleep(); |
74316201 | 1067 | wait_on_bit(&gl->gl_flags, GLF_DEMOTE, TASK_UNINTERRUPTIBLE); |
d93cfa98 AD |
1068 | } |
1069 | ||
b3b94faa DT |
1070 | /** |
1071 | * gfs2_glock_dq_uninit - dequeue a holder from a glock and initialize it | |
1072 | * @gh: the holder structure | |
1073 | * | |
1074 | */ | |
1075 | ||
1076 | void gfs2_glock_dq_uninit(struct gfs2_holder *gh) | |
1077 | { | |
1078 | gfs2_glock_dq(gh); | |
1079 | gfs2_holder_uninit(gh); | |
1080 | } | |
1081 | ||
1082 | /** | |
1083 | * gfs2_glock_nq_num - acquire a glock based on lock number | |
1084 | * @sdp: the filesystem | |
1085 | * @number: the lock number | |
1086 | * @glops: the glock operations for the type of glock | |
1087 | * @state: the state to acquire the glock in | |
25985edc | 1088 | * @flags: modifier flags for the acquisition |
b3b94faa DT |
1089 | * @gh: the struct gfs2_holder |
1090 | * | |
1091 | * Returns: errno | |
1092 | */ | |
1093 | ||
cd915493 | 1094 | int gfs2_glock_nq_num(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 | 1095 | const struct gfs2_glock_operations *glops, |
b58bf407 | 1096 | unsigned int state, u16 flags, struct gfs2_holder *gh) |
b3b94faa DT |
1097 | { |
1098 | struct gfs2_glock *gl; | |
1099 | int error; | |
1100 | ||
1101 | error = gfs2_glock_get(sdp, number, glops, CREATE, &gl); | |
1102 | if (!error) { | |
1103 | error = gfs2_glock_nq_init(gl, state, flags, gh); | |
1104 | gfs2_glock_put(gl); | |
1105 | } | |
1106 | ||
1107 | return error; | |
1108 | } | |
1109 | ||
1110 | /** | |
1111 | * glock_compare - Compare two struct gfs2_glock structures for sorting | |
1112 | * @arg_a: the first structure | |
1113 | * @arg_b: the second structure | |
1114 | * | |
1115 | */ | |
1116 | ||
1117 | static int glock_compare(const void *arg_a, const void *arg_b) | |
1118 | { | |
a5e08a9e SW |
1119 | const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a; |
1120 | const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b; | |
1121 | const struct lm_lockname *a = &gh_a->gh_gl->gl_name; | |
1122 | const struct lm_lockname *b = &gh_b->gh_gl->gl_name; | |
b3b94faa DT |
1123 | |
1124 | if (a->ln_number > b->ln_number) | |
a5e08a9e SW |
1125 | return 1; |
1126 | if (a->ln_number < b->ln_number) | |
1127 | return -1; | |
1c0f4872 | 1128 | BUG_ON(gh_a->gh_gl->gl_ops->go_type == gh_b->gh_gl->gl_ops->go_type); |
a5e08a9e | 1129 | return 0; |
b3b94faa DT |
1130 | } |
1131 | ||
1132 | /** | |
1133 | * nq_m_sync - synchonously acquire more than one glock in deadlock free order | |
1134 | * @num_gh: the number of structures | |
1135 | * @ghs: an array of struct gfs2_holder structures | |
1136 | * | |
1137 | * Returns: 0 on success (all glocks acquired), | |
1138 | * errno on failure (no glocks acquired) | |
1139 | */ | |
1140 | ||
1141 | static int nq_m_sync(unsigned int num_gh, struct gfs2_holder *ghs, | |
1142 | struct gfs2_holder **p) | |
1143 | { | |
1144 | unsigned int x; | |
1145 | int error = 0; | |
1146 | ||
1147 | for (x = 0; x < num_gh; x++) | |
1148 | p[x] = &ghs[x]; | |
1149 | ||
1150 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare, NULL); | |
1151 | ||
1152 | for (x = 0; x < num_gh; x++) { | |
1153 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1154 | ||
1155 | error = gfs2_glock_nq(p[x]); | |
1156 | if (error) { | |
1157 | while (x--) | |
1158 | gfs2_glock_dq(p[x]); | |
1159 | break; | |
1160 | } | |
1161 | } | |
1162 | ||
1163 | return error; | |
1164 | } | |
1165 | ||
1166 | /** | |
1167 | * gfs2_glock_nq_m - acquire multiple glocks | |
1168 | * @num_gh: the number of structures | |
1169 | * @ghs: an array of struct gfs2_holder structures | |
1170 | * | |
b3b94faa DT |
1171 | * |
1172 | * Returns: 0 on success (all glocks acquired), | |
1173 | * errno on failure (no glocks acquired) | |
1174 | */ | |
1175 | ||
1176 | int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1177 | { | |
eaf5bd3c SW |
1178 | struct gfs2_holder *tmp[4]; |
1179 | struct gfs2_holder **pph = tmp; | |
b3b94faa DT |
1180 | int error = 0; |
1181 | ||
eaf5bd3c SW |
1182 | switch(num_gh) { |
1183 | case 0: | |
b3b94faa | 1184 | return 0; |
eaf5bd3c | 1185 | case 1: |
b3b94faa DT |
1186 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); |
1187 | return gfs2_glock_nq(ghs); | |
eaf5bd3c SW |
1188 | default: |
1189 | if (num_gh <= 4) | |
b3b94faa | 1190 | break; |
eaf5bd3c SW |
1191 | pph = kmalloc(num_gh * sizeof(struct gfs2_holder *), GFP_NOFS); |
1192 | if (!pph) | |
1193 | return -ENOMEM; | |
b3b94faa DT |
1194 | } |
1195 | ||
eaf5bd3c | 1196 | error = nq_m_sync(num_gh, ghs, pph); |
b3b94faa | 1197 | |
eaf5bd3c SW |
1198 | if (pph != tmp) |
1199 | kfree(pph); | |
b3b94faa DT |
1200 | |
1201 | return error; | |
1202 | } | |
1203 | ||
1204 | /** | |
1205 | * gfs2_glock_dq_m - release multiple glocks | |
1206 | * @num_gh: the number of structures | |
1207 | * @ghs: an array of struct gfs2_holder structures | |
1208 | * | |
1209 | */ | |
1210 | ||
1211 | void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1212 | { | |
fa1bbdea BP |
1213 | while (num_gh--) |
1214 | gfs2_glock_dq(&ghs[num_gh]); | |
b3b94faa DT |
1215 | } |
1216 | ||
f057f6cd | 1217 | void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state) |
da755fdb | 1218 | { |
c4f68a13 BM |
1219 | unsigned long delay = 0; |
1220 | unsigned long holdtime; | |
1221 | unsigned long now = jiffies; | |
b3b94faa | 1222 | |
f057f6cd | 1223 | gfs2_glock_hold(gl); |
7cf8dcd3 BP |
1224 | holdtime = gl->gl_tchange + gl->gl_hold_time; |
1225 | if (test_bit(GLF_QUEUED, &gl->gl_flags) && | |
1226 | gl->gl_name.ln_type == LM_TYPE_INODE) { | |
7b5e3d5f SW |
1227 | if (time_before(now, holdtime)) |
1228 | delay = holdtime - now; | |
1229 | if (test_bit(GLF_REPLY_PENDING, &gl->gl_flags)) | |
7cf8dcd3 | 1230 | delay = gl->gl_hold_time; |
7b5e3d5f | 1231 | } |
b3b94faa | 1232 | |
f3dd1649 | 1233 | spin_lock(&gl->gl_lockref.lock); |
81ffbf65 | 1234 | handle_callback(gl, state, delay, true); |
f3dd1649 | 1235 | spin_unlock(&gl->gl_lockref.lock); |
c4f68a13 BM |
1236 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0) |
1237 | gfs2_glock_put(gl); | |
b3b94faa DT |
1238 | } |
1239 | ||
0809f6ec SW |
1240 | /** |
1241 | * gfs2_should_freeze - Figure out if glock should be frozen | |
1242 | * @gl: The glock in question | |
1243 | * | |
1244 | * Glocks are not frozen if (a) the result of the dlm operation is | |
1245 | * an error, (b) the locking operation was an unlock operation or | |
1246 | * (c) if there is a "noexp" flagged request anywhere in the queue | |
1247 | * | |
1248 | * Returns: 1 if freezing should occur, 0 otherwise | |
1249 | */ | |
1250 | ||
1251 | static int gfs2_should_freeze(const struct gfs2_glock *gl) | |
1252 | { | |
1253 | const struct gfs2_holder *gh; | |
1254 | ||
1255 | if (gl->gl_reply & ~LM_OUT_ST_MASK) | |
1256 | return 0; | |
1257 | if (gl->gl_target == LM_ST_UNLOCKED) | |
1258 | return 0; | |
1259 | ||
1260 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
1261 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
1262 | continue; | |
1263 | if (LM_FLAG_NOEXP & gh->gh_flags) | |
1264 | return 0; | |
1265 | } | |
1266 | ||
1267 | return 1; | |
1268 | } | |
1269 | ||
b3b94faa | 1270 | /** |
f057f6cd SW |
1271 | * gfs2_glock_complete - Callback used by locking |
1272 | * @gl: Pointer to the glock | |
1273 | * @ret: The return value from the dlm | |
b3b94faa | 1274 | * |
f3dd1649 | 1275 | * The gl_reply field is under the gl_lockref.lock lock so that it is ok |
47a25380 | 1276 | * to use a bitfield shared with other glock state fields. |
b3b94faa DT |
1277 | */ |
1278 | ||
f057f6cd | 1279 | void gfs2_glock_complete(struct gfs2_glock *gl, int ret) |
b3b94faa | 1280 | { |
15562c43 | 1281 | struct lm_lockstruct *ls = &gl->gl_name.ln_sbd->sd_lockstruct; |
0809f6ec | 1282 | |
f3dd1649 | 1283 | spin_lock(&gl->gl_lockref.lock); |
f057f6cd | 1284 | gl->gl_reply = ret; |
0809f6ec | 1285 | |
e0c2a9aa | 1286 | if (unlikely(test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))) { |
0809f6ec | 1287 | if (gfs2_should_freeze(gl)) { |
f057f6cd | 1288 | set_bit(GLF_FROZEN, &gl->gl_flags); |
f3dd1649 | 1289 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa | 1290 | return; |
0809f6ec | 1291 | } |
b3b94faa | 1292 | } |
47a25380 | 1293 | |
e66cf161 | 1294 | gl->gl_lockref.count++; |
f057f6cd | 1295 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
f3dd1649 | 1296 | spin_unlock(&gl->gl_lockref.lock); |
e66cf161 | 1297 | |
f057f6cd SW |
1298 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
1299 | gfs2_glock_put(gl); | |
b3b94faa DT |
1300 | } |
1301 | ||
4506a519 SW |
1302 | static int glock_cmp(void *priv, struct list_head *a, struct list_head *b) |
1303 | { | |
1304 | struct gfs2_glock *gla, *glb; | |
1305 | ||
1306 | gla = list_entry(a, struct gfs2_glock, gl_lru); | |
1307 | glb = list_entry(b, struct gfs2_glock, gl_lru); | |
1308 | ||
1309 | if (gla->gl_name.ln_number > glb->gl_name.ln_number) | |
1310 | return 1; | |
1311 | if (gla->gl_name.ln_number < glb->gl_name.ln_number) | |
1312 | return -1; | |
1313 | ||
1314 | return 0; | |
1315 | } | |
1316 | ||
1317 | /** | |
1318 | * gfs2_dispose_glock_lru - Demote a list of glocks | |
1319 | * @list: The list to dispose of | |
1320 | * | |
1321 | * Disposing of glocks may involve disk accesses, so that here we sort | |
1322 | * the glocks by number (i.e. disk location of the inodes) so that if | |
1323 | * there are any such accesses, they'll be sent in order (mostly). | |
1324 | * | |
1325 | * Must be called under the lru_lock, but may drop and retake this | |
1326 | * lock. While the lru_lock is dropped, entries may vanish from the | |
1327 | * list, but no new entries will appear on the list (since it is | |
1328 | * private) | |
1329 | */ | |
1330 | ||
1331 | static void gfs2_dispose_glock_lru(struct list_head *list) | |
1332 | __releases(&lru_lock) | |
1333 | __acquires(&lru_lock) | |
1334 | { | |
1335 | struct gfs2_glock *gl; | |
1336 | ||
1337 | list_sort(NULL, list, glock_cmp); | |
1338 | ||
1339 | while(!list_empty(list)) { | |
1340 | gl = list_entry(list->next, struct gfs2_glock, gl_lru); | |
1341 | list_del_init(&gl->gl_lru); | |
f3dd1649 | 1342 | if (!spin_trylock(&gl->gl_lockref.lock)) { |
94a09a39 | 1343 | add_back_to_lru: |
e66cf161 SW |
1344 | list_add(&gl->gl_lru, &lru_list); |
1345 | atomic_inc(&lru_count); | |
1346 | continue; | |
1347 | } | |
94a09a39 | 1348 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) { |
f3dd1649 | 1349 | spin_unlock(&gl->gl_lockref.lock); |
94a09a39 SW |
1350 | goto add_back_to_lru; |
1351 | } | |
4506a519 | 1352 | clear_bit(GLF_LRU, &gl->gl_flags); |
e66cf161 | 1353 | gl->gl_lockref.count++; |
4506a519 | 1354 | if (demote_ok(gl)) |
81ffbf65 | 1355 | handle_callback(gl, LM_ST_UNLOCKED, 0, false); |
4506a519 | 1356 | WARN_ON(!test_and_clear_bit(GLF_LOCK, &gl->gl_flags)); |
4506a519 | 1357 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
e66cf161 | 1358 | gl->gl_lockref.count--; |
f3dd1649 | 1359 | spin_unlock(&gl->gl_lockref.lock); |
94a09a39 | 1360 | cond_resched_lock(&lru_lock); |
4506a519 SW |
1361 | } |
1362 | } | |
1363 | ||
2a005855 SW |
1364 | /** |
1365 | * gfs2_scan_glock_lru - Scan the LRU looking for locks to demote | |
1366 | * @nr: The number of entries to scan | |
1367 | * | |
4506a519 SW |
1368 | * This function selects the entries on the LRU which are able to |
1369 | * be demoted, and then kicks off the process by calling | |
1370 | * gfs2_dispose_glock_lru() above. | |
2a005855 | 1371 | */ |
b3b94faa | 1372 | |
1ab6c499 | 1373 | static long gfs2_scan_glock_lru(int nr) |
b3b94faa DT |
1374 | { |
1375 | struct gfs2_glock *gl; | |
97cc1025 | 1376 | LIST_HEAD(skipped); |
4506a519 | 1377 | LIST_HEAD(dispose); |
1ab6c499 | 1378 | long freed = 0; |
b3b94faa | 1379 | |
97cc1025 | 1380 | spin_lock(&lru_lock); |
1ab6c499 | 1381 | while ((nr-- >= 0) && !list_empty(&lru_list)) { |
97cc1025 | 1382 | gl = list_entry(lru_list.next, struct gfs2_glock, gl_lru); |
97cc1025 SW |
1383 | |
1384 | /* Test for being demotable */ | |
94a09a39 | 1385 | if (!test_bit(GLF_LOCK, &gl->gl_flags)) { |
4506a519 SW |
1386 | list_move(&gl->gl_lru, &dispose); |
1387 | atomic_dec(&lru_count); | |
1ab6c499 | 1388 | freed++; |
2163b1e6 | 1389 | continue; |
97cc1025 | 1390 | } |
4506a519 SW |
1391 | |
1392 | list_move(&gl->gl_lru, &skipped); | |
b3b94faa | 1393 | } |
97cc1025 | 1394 | list_splice(&skipped, &lru_list); |
4506a519 SW |
1395 | if (!list_empty(&dispose)) |
1396 | gfs2_dispose_glock_lru(&dispose); | |
97cc1025 | 1397 | spin_unlock(&lru_lock); |
1ab6c499 DC |
1398 | |
1399 | return freed; | |
2a005855 SW |
1400 | } |
1401 | ||
1ab6c499 DC |
1402 | static unsigned long gfs2_glock_shrink_scan(struct shrinker *shrink, |
1403 | struct shrink_control *sc) | |
2a005855 | 1404 | { |
1ab6c499 DC |
1405 | if (!(sc->gfp_mask & __GFP_FS)) |
1406 | return SHRINK_STOP; | |
1407 | return gfs2_scan_glock_lru(sc->nr_to_scan); | |
1408 | } | |
2a005855 | 1409 | |
1ab6c499 DC |
1410 | static unsigned long gfs2_glock_shrink_count(struct shrinker *shrink, |
1411 | struct shrink_control *sc) | |
1412 | { | |
55f841ce | 1413 | return vfs_pressure_ratio(atomic_read(&lru_count)); |
b3b94faa DT |
1414 | } |
1415 | ||
97cc1025 | 1416 | static struct shrinker glock_shrinker = { |
97cc1025 | 1417 | .seeks = DEFAULT_SEEKS, |
1ab6c499 DC |
1418 | .count_objects = gfs2_glock_shrink_count, |
1419 | .scan_objects = gfs2_glock_shrink_scan, | |
97cc1025 SW |
1420 | }; |
1421 | ||
b3b94faa DT |
1422 | /** |
1423 | * examine_bucket - Call a function for glock in a hash bucket | |
1424 | * @examiner: the function | |
1425 | * @sdp: the filesystem | |
1426 | * @bucket: the bucket | |
1427 | * | |
98687f42 HX |
1428 | * Note that the function can be called multiple times on the same |
1429 | * object. So the user must ensure that the function can cope with | |
1430 | * that. | |
b3b94faa DT |
1431 | */ |
1432 | ||
88ffbf3e | 1433 | static void glock_hash_walk(glock_examiner examiner, const struct gfs2_sbd *sdp) |
b3b94faa | 1434 | { |
bc015cb8 | 1435 | struct gfs2_glock *gl; |
98687f42 HX |
1436 | struct rhashtable_iter iter; |
1437 | ||
1438 | rhashtable_walk_enter(&gl_hash_table, &iter); | |
1439 | ||
1440 | do { | |
1441 | gl = ERR_PTR(rhashtable_walk_start(&iter)); | |
1442 | if (gl) | |
1443 | continue; | |
1444 | ||
1445 | while ((gl = rhashtable_walk_next(&iter)) && !IS_ERR(gl)) | |
88ffbf3e BP |
1446 | if ((gl->gl_name.ln_sbd == sdp) && |
1447 | lockref_get_not_dead(&gl->gl_lockref)) | |
1448 | examiner(gl); | |
98687f42 HX |
1449 | |
1450 | rhashtable_walk_stop(&iter); | |
1451 | } while (cond_resched(), gl == ERR_PTR(-EAGAIN)); | |
1452 | ||
1453 | rhashtable_walk_exit(&iter); | |
bc015cb8 SW |
1454 | } |
1455 | ||
f057f6cd SW |
1456 | /** |
1457 | * thaw_glock - thaw out a glock which has an unprocessed reply waiting | |
1458 | * @gl: The glock to thaw | |
1459 | * | |
f057f6cd SW |
1460 | */ |
1461 | ||
1462 | static void thaw_glock(struct gfs2_glock *gl) | |
1463 | { | |
1464 | if (!test_and_clear_bit(GLF_FROZEN, &gl->gl_flags)) | |
7286b31e | 1465 | goto out; |
f057f6cd | 1466 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
7286b31e SW |
1467 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) { |
1468 | out: | |
f057f6cd | 1469 | gfs2_glock_put(gl); |
7286b31e | 1470 | } |
f057f6cd SW |
1471 | } |
1472 | ||
b3b94faa DT |
1473 | /** |
1474 | * clear_glock - look at a glock and see if we can free it from glock cache | |
1475 | * @gl: the glock to look at | |
1476 | * | |
1477 | */ | |
1478 | ||
1479 | static void clear_glock(struct gfs2_glock *gl) | |
1480 | { | |
f42ab085 | 1481 | gfs2_glock_remove_from_lru(gl); |
b3b94faa | 1482 | |
f3dd1649 | 1483 | spin_lock(&gl->gl_lockref.lock); |
c741c455 | 1484 | if (gl->gl_state != LM_ST_UNLOCKED) |
81ffbf65 | 1485 | handle_callback(gl, LM_ST_UNLOCKED, 0, false); |
f3dd1649 | 1486 | spin_unlock(&gl->gl_lockref.lock); |
6802e340 SW |
1487 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
1488 | gfs2_glock_put(gl); | |
b3b94faa DT |
1489 | } |
1490 | ||
f057f6cd SW |
1491 | /** |
1492 | * gfs2_glock_thaw - Thaw any frozen glocks | |
1493 | * @sdp: The super block | |
1494 | * | |
1495 | */ | |
1496 | ||
1497 | void gfs2_glock_thaw(struct gfs2_sbd *sdp) | |
1498 | { | |
bc015cb8 SW |
1499 | glock_hash_walk(thaw_glock, sdp); |
1500 | } | |
f057f6cd | 1501 | |
ac3beb6a | 1502 | static void dump_glock(struct seq_file *seq, struct gfs2_glock *gl) |
bc015cb8 | 1503 | { |
f3dd1649 | 1504 | spin_lock(&gl->gl_lockref.lock); |
ac3beb6a | 1505 | gfs2_dump_glock(seq, gl); |
f3dd1649 | 1506 | spin_unlock(&gl->gl_lockref.lock); |
bc015cb8 SW |
1507 | } |
1508 | ||
1509 | static void dump_glock_func(struct gfs2_glock *gl) | |
1510 | { | |
1511 | dump_glock(NULL, gl); | |
f057f6cd SW |
1512 | } |
1513 | ||
b3b94faa DT |
1514 | /** |
1515 | * gfs2_gl_hash_clear - Empty out the glock hash table | |
1516 | * @sdp: the filesystem | |
1517 | * @wait: wait until it's all gone | |
1518 | * | |
1bdad606 | 1519 | * Called when unmounting the filesystem. |
b3b94faa DT |
1520 | */ |
1521 | ||
fefc03bf | 1522 | void gfs2_gl_hash_clear(struct gfs2_sbd *sdp) |
b3b94faa | 1523 | { |
fb6791d1 | 1524 | set_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags); |
222cb538 | 1525 | flush_workqueue(glock_workqueue); |
bc015cb8 | 1526 | glock_hash_walk(clear_glock, sdp); |
8f05228e | 1527 | flush_workqueue(glock_workqueue); |
2aba1b5b BP |
1528 | wait_event_timeout(sdp->sd_glock_wait, |
1529 | atomic_read(&sdp->sd_glock_disposal) == 0, | |
1530 | HZ * 600); | |
bc015cb8 | 1531 | glock_hash_walk(dump_glock_func, sdp); |
b3b94faa DT |
1532 | } |
1533 | ||
813e0c46 SW |
1534 | void gfs2_glock_finish_truncate(struct gfs2_inode *ip) |
1535 | { | |
1536 | struct gfs2_glock *gl = ip->i_gl; | |
1537 | int ret; | |
1538 | ||
1539 | ret = gfs2_truncatei_resume(ip); | |
15562c43 | 1540 | gfs2_assert_withdraw(gl->gl_name.ln_sbd, ret == 0); |
813e0c46 | 1541 | |
f3dd1649 | 1542 | spin_lock(&gl->gl_lockref.lock); |
813e0c46 SW |
1543 | clear_bit(GLF_LOCK, &gl->gl_flags); |
1544 | run_queue(gl, 1); | |
f3dd1649 | 1545 | spin_unlock(&gl->gl_lockref.lock); |
813e0c46 SW |
1546 | } |
1547 | ||
6802e340 | 1548 | static const char *state2str(unsigned state) |
04b933f2 | 1549 | { |
6802e340 SW |
1550 | switch(state) { |
1551 | case LM_ST_UNLOCKED: | |
1552 | return "UN"; | |
1553 | case LM_ST_SHARED: | |
1554 | return "SH"; | |
1555 | case LM_ST_DEFERRED: | |
1556 | return "DF"; | |
1557 | case LM_ST_EXCLUSIVE: | |
1558 | return "EX"; | |
1559 | } | |
1560 | return "??"; | |
1561 | } | |
1562 | ||
b58bf407 | 1563 | static const char *hflags2str(char *buf, u16 flags, unsigned long iflags) |
6802e340 SW |
1564 | { |
1565 | char *p = buf; | |
1566 | if (flags & LM_FLAG_TRY) | |
1567 | *p++ = 't'; | |
1568 | if (flags & LM_FLAG_TRY_1CB) | |
1569 | *p++ = 'T'; | |
1570 | if (flags & LM_FLAG_NOEXP) | |
1571 | *p++ = 'e'; | |
1572 | if (flags & LM_FLAG_ANY) | |
f057f6cd | 1573 | *p++ = 'A'; |
6802e340 SW |
1574 | if (flags & LM_FLAG_PRIORITY) |
1575 | *p++ = 'p'; | |
1576 | if (flags & GL_ASYNC) | |
1577 | *p++ = 'a'; | |
1578 | if (flags & GL_EXACT) | |
1579 | *p++ = 'E'; | |
6802e340 SW |
1580 | if (flags & GL_NOCACHE) |
1581 | *p++ = 'c'; | |
1582 | if (test_bit(HIF_HOLDER, &iflags)) | |
1583 | *p++ = 'H'; | |
1584 | if (test_bit(HIF_WAIT, &iflags)) | |
1585 | *p++ = 'W'; | |
1586 | if (test_bit(HIF_FIRST, &iflags)) | |
1587 | *p++ = 'F'; | |
1588 | *p = 0; | |
1589 | return buf; | |
04b933f2 RP |
1590 | } |
1591 | ||
b3b94faa DT |
1592 | /** |
1593 | * dump_holder - print information about a glock holder | |
6802e340 | 1594 | * @seq: the seq_file struct |
b3b94faa DT |
1595 | * @gh: the glock holder |
1596 | * | |
b3b94faa DT |
1597 | */ |
1598 | ||
ac3beb6a | 1599 | static void dump_holder(struct seq_file *seq, const struct gfs2_holder *gh) |
b3b94faa | 1600 | { |
6802e340 | 1601 | struct task_struct *gh_owner = NULL; |
6802e340 | 1602 | char flags_buf[32]; |
b3b94faa | 1603 | |
0b3a2c99 | 1604 | rcu_read_lock(); |
6802e340 | 1605 | if (gh->gh_owner_pid) |
b1e058da | 1606 | gh_owner = pid_task(gh->gh_owner_pid, PIDTYPE_PID); |
cc18152e JP |
1607 | gfs2_print_dbg(seq, " H: s:%s f:%s e:%d p:%ld [%s] %pS\n", |
1608 | state2str(gh->gh_state), | |
1609 | hflags2str(flags_buf, gh->gh_flags, gh->gh_iflags), | |
1610 | gh->gh_error, | |
1611 | gh->gh_owner_pid ? (long)pid_nr(gh->gh_owner_pid) : -1, | |
1612 | gh_owner ? gh_owner->comm : "(ended)", | |
1613 | (void *)gh->gh_ip); | |
0b3a2c99 | 1614 | rcu_read_unlock(); |
b3b94faa DT |
1615 | } |
1616 | ||
627c10b7 | 1617 | static const char *gflags2str(char *buf, const struct gfs2_glock *gl) |
6802e340 | 1618 | { |
627c10b7 | 1619 | const unsigned long *gflags = &gl->gl_flags; |
6802e340 | 1620 | char *p = buf; |
627c10b7 | 1621 | |
6802e340 SW |
1622 | if (test_bit(GLF_LOCK, gflags)) |
1623 | *p++ = 'l'; | |
6802e340 SW |
1624 | if (test_bit(GLF_DEMOTE, gflags)) |
1625 | *p++ = 'D'; | |
1626 | if (test_bit(GLF_PENDING_DEMOTE, gflags)) | |
1627 | *p++ = 'd'; | |
1628 | if (test_bit(GLF_DEMOTE_IN_PROGRESS, gflags)) | |
1629 | *p++ = 'p'; | |
1630 | if (test_bit(GLF_DIRTY, gflags)) | |
1631 | *p++ = 'y'; | |
1632 | if (test_bit(GLF_LFLUSH, gflags)) | |
1633 | *p++ = 'f'; | |
1634 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, gflags)) | |
1635 | *p++ = 'i'; | |
1636 | if (test_bit(GLF_REPLY_PENDING, gflags)) | |
1637 | *p++ = 'r'; | |
f057f6cd | 1638 | if (test_bit(GLF_INITIAL, gflags)) |
d8348de0 | 1639 | *p++ = 'I'; |
f057f6cd SW |
1640 | if (test_bit(GLF_FROZEN, gflags)) |
1641 | *p++ = 'F'; | |
7b5e3d5f SW |
1642 | if (test_bit(GLF_QUEUED, gflags)) |
1643 | *p++ = 'q'; | |
627c10b7 SW |
1644 | if (test_bit(GLF_LRU, gflags)) |
1645 | *p++ = 'L'; | |
1646 | if (gl->gl_object) | |
1647 | *p++ = 'o'; | |
a245769f SW |
1648 | if (test_bit(GLF_BLOCKING, gflags)) |
1649 | *p++ = 'b'; | |
6802e340 SW |
1650 | *p = 0; |
1651 | return buf; | |
b3b94faa DT |
1652 | } |
1653 | ||
1654 | /** | |
8eae1ca0 | 1655 | * gfs2_dump_glock - print information about a glock |
6802e340 | 1656 | * @seq: The seq_file struct |
b3b94faa | 1657 | * @gl: the glock |
6802e340 SW |
1658 | * |
1659 | * The file format is as follows: | |
1660 | * One line per object, capital letters are used to indicate objects | |
1661 | * G = glock, I = Inode, R = rgrp, H = holder. Glocks are not indented, | |
1662 | * other objects are indented by a single space and follow the glock to | |
1663 | * which they are related. Fields are indicated by lower case letters | |
1664 | * followed by a colon and the field value, except for strings which are in | |
1665 | * [] so that its possible to see if they are composed of spaces for | |
1666 | * example. The field's are n = number (id of the object), f = flags, | |
1667 | * t = type, s = state, r = refcount, e = error, p = pid. | |
b3b94faa | 1668 | * |
b3b94faa DT |
1669 | */ |
1670 | ||
ac3beb6a | 1671 | void gfs2_dump_glock(struct seq_file *seq, const struct gfs2_glock *gl) |
b3b94faa | 1672 | { |
6802e340 SW |
1673 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
1674 | unsigned long long dtime; | |
1675 | const struct gfs2_holder *gh; | |
1676 | char gflags_buf[32]; | |
b3b94faa | 1677 | |
6802e340 SW |
1678 | dtime = jiffies - gl->gl_demote_time; |
1679 | dtime *= 1000000/HZ; /* demote time in uSec */ | |
1680 | if (!test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
1681 | dtime = 0; | |
7cf8dcd3 | 1682 | 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 |
1683 | state2str(gl->gl_state), |
1684 | gl->gl_name.ln_type, | |
1685 | (unsigned long long)gl->gl_name.ln_number, | |
627c10b7 | 1686 | gflags2str(gflags_buf, gl), |
6802e340 SW |
1687 | state2str(gl->gl_target), |
1688 | state2str(gl->gl_demote_state), dtime, | |
6802e340 | 1689 | atomic_read(&gl->gl_ail_count), |
f42ab085 | 1690 | atomic_read(&gl->gl_revokes), |
e66cf161 | 1691 | (int)gl->gl_lockref.count, gl->gl_hold_time); |
b3b94faa | 1692 | |
ac3beb6a SW |
1693 | list_for_each_entry(gh, &gl->gl_holders, gh_list) |
1694 | dump_holder(seq, gh); | |
1695 | ||
6802e340 | 1696 | if (gl->gl_state != LM_ST_UNLOCKED && glops->go_dump) |
ac3beb6a | 1697 | glops->go_dump(seq, gl); |
b3b94faa DT |
1698 | } |
1699 | ||
a245769f SW |
1700 | static int gfs2_glstats_seq_show(struct seq_file *seq, void *iter_ptr) |
1701 | { | |
1702 | struct gfs2_glock *gl = iter_ptr; | |
1703 | ||
4d207133 | 1704 | seq_printf(seq, "G: n:%u/%llx rtt:%llu/%llu rttb:%llu/%llu irt:%llu/%llu dcnt: %llu qcnt: %llu\n", |
a245769f SW |
1705 | gl->gl_name.ln_type, |
1706 | (unsigned long long)gl->gl_name.ln_number, | |
4d207133 BH |
1707 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTT], |
1708 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTVAR], | |
1709 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTB], | |
1710 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTVARB], | |
1711 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SIRT], | |
1712 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SIRTVAR], | |
1713 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_DCOUNT], | |
1714 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_QCOUNT]); | |
a245769f SW |
1715 | return 0; |
1716 | } | |
1717 | ||
1718 | static const char *gfs2_gltype[] = { | |
1719 | "type", | |
1720 | "reserved", | |
1721 | "nondisk", | |
1722 | "inode", | |
1723 | "rgrp", | |
1724 | "meta", | |
1725 | "iopen", | |
1726 | "flock", | |
1727 | "plock", | |
1728 | "quota", | |
1729 | "journal", | |
1730 | }; | |
1731 | ||
1732 | static const char *gfs2_stype[] = { | |
1733 | [GFS2_LKS_SRTT] = "srtt", | |
1734 | [GFS2_LKS_SRTTVAR] = "srttvar", | |
1735 | [GFS2_LKS_SRTTB] = "srttb", | |
1736 | [GFS2_LKS_SRTTVARB] = "srttvarb", | |
1737 | [GFS2_LKS_SIRT] = "sirt", | |
1738 | [GFS2_LKS_SIRTVAR] = "sirtvar", | |
1739 | [GFS2_LKS_DCOUNT] = "dlm", | |
1740 | [GFS2_LKS_QCOUNT] = "queue", | |
1741 | }; | |
1742 | ||
1743 | #define GFS2_NR_SBSTATS (ARRAY_SIZE(gfs2_gltype) * ARRAY_SIZE(gfs2_stype)) | |
1744 | ||
1745 | static int gfs2_sbstats_seq_show(struct seq_file *seq, void *iter_ptr) | |
1746 | { | |
81648d04 AG |
1747 | struct gfs2_sbd *sdp = seq->private; |
1748 | loff_t pos = *(loff_t *)iter_ptr; | |
1749 | unsigned index = pos >> 3; | |
1750 | unsigned subindex = pos & 0x07; | |
a245769f SW |
1751 | int i; |
1752 | ||
1753 | if (index == 0 && subindex != 0) | |
1754 | return 0; | |
6802e340 | 1755 | |
a245769f SW |
1756 | seq_printf(seq, "%-10s %8s:", gfs2_gltype[index], |
1757 | (index == 0) ? "cpu": gfs2_stype[subindex]); | |
b3b94faa | 1758 | |
a245769f SW |
1759 | for_each_possible_cpu(i) { |
1760 | const struct gfs2_pcpu_lkstats *lkstats = per_cpu_ptr(sdp->sd_lkstats, i); | |
8f7e0a80 AG |
1761 | |
1762 | if (index == 0) | |
1763 | seq_printf(seq, " %15u", i); | |
1764 | else | |
1765 | seq_printf(seq, " %15llu", (unsigned long long)lkstats-> | |
1766 | lkstats[index - 1].stats[subindex]); | |
a245769f SW |
1767 | } |
1768 | seq_putc(seq, '\n'); | |
1769 | return 0; | |
1770 | } | |
8fbbfd21 | 1771 | |
85d1da67 SW |
1772 | int __init gfs2_glock_init(void) |
1773 | { | |
88ffbf3e BP |
1774 | int ret; |
1775 | ||
1776 | ret = rhashtable_init(&gl_hash_table, &ht_parms); | |
1777 | if (ret < 0) | |
1778 | return ret; | |
8fbbfd21 | 1779 | |
d2115778 | 1780 | glock_workqueue = alloc_workqueue("glock_workqueue", WQ_MEM_RECLAIM | |
58a69cb4 | 1781 | WQ_HIGHPRI | WQ_FREEZABLE, 0); |
88ffbf3e BP |
1782 | if (!glock_workqueue) { |
1783 | rhashtable_destroy(&gl_hash_table); | |
dfc4616d | 1784 | return -ENOMEM; |
88ffbf3e | 1785 | } |
d2115778 | 1786 | gfs2_delete_workqueue = alloc_workqueue("delete_workqueue", |
58a69cb4 | 1787 | WQ_MEM_RECLAIM | WQ_FREEZABLE, |
d2115778 | 1788 | 0); |
dfc4616d | 1789 | if (!gfs2_delete_workqueue) { |
b94a170e | 1790 | destroy_workqueue(glock_workqueue); |
88ffbf3e | 1791 | rhashtable_destroy(&gl_hash_table); |
dfc4616d | 1792 | return -ENOMEM; |
b94a170e | 1793 | } |
97cc1025 | 1794 | |
e0d735c1 CY |
1795 | ret = register_shrinker(&glock_shrinker); |
1796 | if (ret) { | |
1797 | destroy_workqueue(gfs2_delete_workqueue); | |
1798 | destroy_workqueue(glock_workqueue); | |
1799 | rhashtable_destroy(&gl_hash_table); | |
1800 | return ret; | |
1801 | } | |
c4f68a13 | 1802 | |
85d1da67 SW |
1803 | return 0; |
1804 | } | |
1805 | ||
8fbbfd21 SW |
1806 | void gfs2_glock_exit(void) |
1807 | { | |
97cc1025 | 1808 | unregister_shrinker(&glock_shrinker); |
88ffbf3e | 1809 | rhashtable_destroy(&gl_hash_table); |
c4f68a13 | 1810 | destroy_workqueue(glock_workqueue); |
b94a170e | 1811 | destroy_workqueue(gfs2_delete_workqueue); |
8fbbfd21 SW |
1812 | } |
1813 | ||
88ffbf3e | 1814 | static void gfs2_glock_iter_next(struct gfs2_glock_iter *gi) |
bc015cb8 | 1815 | { |
14d37564 | 1816 | while ((gi->gl = rhashtable_walk_next(&gi->hti))) { |
88ffbf3e BP |
1817 | if (IS_ERR(gi->gl)) { |
1818 | if (PTR_ERR(gi->gl) == -EAGAIN) | |
1819 | continue; | |
1820 | gi->gl = NULL; | |
14d37564 | 1821 | return; |
bc015cb8 | 1822 | } |
14d37564 DC |
1823 | /* Skip entries for other sb and dead entries */ |
1824 | if (gi->sdp == gi->gl->gl_name.ln_sbd && | |
1825 | !__lockref_is_dead(&gi->gl->gl_lockref)) | |
1826 | return; | |
1827 | } | |
7c52b166 RP |
1828 | } |
1829 | ||
6802e340 | 1830 | static void *gfs2_glock_seq_start(struct seq_file *seq, loff_t *pos) |
7c52b166 | 1831 | { |
6802e340 | 1832 | struct gfs2_glock_iter *gi = seq->private; |
7c52b166 | 1833 | loff_t n = *pos; |
88ffbf3e | 1834 | int ret; |
7c52b166 | 1835 | |
ba1ddcb6 | 1836 | if (gi->last_pos <= *pos) |
88ffbf3e | 1837 | n = (*pos - gi->last_pos); |
ba1ddcb6 | 1838 | |
88ffbf3e BP |
1839 | ret = rhashtable_walk_start(&gi->hti); |
1840 | if (ret) | |
1841 | return NULL; | |
7c52b166 | 1842 | |
6802e340 | 1843 | do { |
88ffbf3e BP |
1844 | gfs2_glock_iter_next(gi); |
1845 | } while (gi->gl && n--); | |
7c52b166 | 1846 | |
ba1ddcb6 | 1847 | gi->last_pos = *pos; |
6802e340 | 1848 | return gi->gl; |
7c52b166 RP |
1849 | } |
1850 | ||
6802e340 | 1851 | static void *gfs2_glock_seq_next(struct seq_file *seq, void *iter_ptr, |
7c52b166 RP |
1852 | loff_t *pos) |
1853 | { | |
6802e340 | 1854 | struct gfs2_glock_iter *gi = seq->private; |
7c52b166 RP |
1855 | |
1856 | (*pos)++; | |
ba1ddcb6 | 1857 | gi->last_pos = *pos; |
88ffbf3e | 1858 | gfs2_glock_iter_next(gi); |
6802e340 | 1859 | return gi->gl; |
7c52b166 RP |
1860 | } |
1861 | ||
6802e340 | 1862 | static void gfs2_glock_seq_stop(struct seq_file *seq, void *iter_ptr) |
7c52b166 | 1863 | { |
6802e340 | 1864 | struct gfs2_glock_iter *gi = seq->private; |
bc015cb8 | 1865 | |
bc015cb8 | 1866 | gi->gl = NULL; |
88ffbf3e | 1867 | rhashtable_walk_stop(&gi->hti); |
7c52b166 RP |
1868 | } |
1869 | ||
6802e340 | 1870 | static int gfs2_glock_seq_show(struct seq_file *seq, void *iter_ptr) |
7c52b166 | 1871 | { |
ac3beb6a SW |
1872 | dump_glock(seq, iter_ptr); |
1873 | return 0; | |
7c52b166 RP |
1874 | } |
1875 | ||
a245769f SW |
1876 | static void *gfs2_sbstats_seq_start(struct seq_file *seq, loff_t *pos) |
1877 | { | |
81648d04 | 1878 | preempt_disable(); |
a245769f SW |
1879 | if (*pos >= GFS2_NR_SBSTATS) |
1880 | return NULL; | |
81648d04 | 1881 | return pos; |
a245769f SW |
1882 | } |
1883 | ||
1884 | static void *gfs2_sbstats_seq_next(struct seq_file *seq, void *iter_ptr, | |
1885 | loff_t *pos) | |
1886 | { | |
a245769f | 1887 | (*pos)++; |
81648d04 | 1888 | if (*pos >= GFS2_NR_SBSTATS) |
a245769f | 1889 | return NULL; |
81648d04 | 1890 | return pos; |
a245769f SW |
1891 | } |
1892 | ||
1893 | static void gfs2_sbstats_seq_stop(struct seq_file *seq, void *iter_ptr) | |
1894 | { | |
1895 | preempt_enable(); | |
1896 | } | |
1897 | ||
4ef29002 | 1898 | static const struct seq_operations gfs2_glock_seq_ops = { |
7c52b166 RP |
1899 | .start = gfs2_glock_seq_start, |
1900 | .next = gfs2_glock_seq_next, | |
1901 | .stop = gfs2_glock_seq_stop, | |
1902 | .show = gfs2_glock_seq_show, | |
1903 | }; | |
1904 | ||
a245769f SW |
1905 | static const struct seq_operations gfs2_glstats_seq_ops = { |
1906 | .start = gfs2_glock_seq_start, | |
1907 | .next = gfs2_glock_seq_next, | |
1908 | .stop = gfs2_glock_seq_stop, | |
1909 | .show = gfs2_glstats_seq_show, | |
1910 | }; | |
1911 | ||
1912 | static const struct seq_operations gfs2_sbstats_seq_ops = { | |
1913 | .start = gfs2_sbstats_seq_start, | |
1914 | .next = gfs2_sbstats_seq_next, | |
1915 | .stop = gfs2_sbstats_seq_stop, | |
1916 | .show = gfs2_sbstats_seq_show, | |
1917 | }; | |
1918 | ||
0fe2f1e9 SW |
1919 | #define GFS2_SEQ_GOODSIZE min(PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER, 65536UL) |
1920 | ||
a245769f | 1921 | static int gfs2_glocks_open(struct inode *inode, struct file *file) |
7c52b166 | 1922 | { |
6802e340 SW |
1923 | int ret = seq_open_private(file, &gfs2_glock_seq_ops, |
1924 | sizeof(struct gfs2_glock_iter)); | |
1925 | if (ret == 0) { | |
1926 | struct seq_file *seq = file->private_data; | |
1927 | struct gfs2_glock_iter *gi = seq->private; | |
88ffbf3e | 1928 | |
6802e340 | 1929 | gi->sdp = inode->i_private; |
88ffbf3e | 1930 | gi->last_pos = 0; |
0fe2f1e9 | 1931 | seq->buf = kmalloc(GFS2_SEQ_GOODSIZE, GFP_KERNEL | __GFP_NOWARN); |
df5d2f55 | 1932 | if (seq->buf) |
0fe2f1e9 | 1933 | seq->size = GFS2_SEQ_GOODSIZE; |
88ffbf3e | 1934 | gi->gl = NULL; |
8f6fd83c | 1935 | ret = rhashtable_walk_init(&gl_hash_table, &gi->hti, GFP_KERNEL); |
6802e340 SW |
1936 | } |
1937 | return ret; | |
7c52b166 RP |
1938 | } |
1939 | ||
88ffbf3e BP |
1940 | static int gfs2_glocks_release(struct inode *inode, struct file *file) |
1941 | { | |
1942 | struct seq_file *seq = file->private_data; | |
1943 | struct gfs2_glock_iter *gi = seq->private; | |
1944 | ||
1945 | gi->gl = NULL; | |
1946 | rhashtable_walk_exit(&gi->hti); | |
1947 | return seq_release_private(inode, file); | |
1948 | } | |
1949 | ||
a245769f SW |
1950 | static int gfs2_glstats_open(struct inode *inode, struct file *file) |
1951 | { | |
1952 | int ret = seq_open_private(file, &gfs2_glstats_seq_ops, | |
1953 | sizeof(struct gfs2_glock_iter)); | |
1954 | if (ret == 0) { | |
1955 | struct seq_file *seq = file->private_data; | |
1956 | struct gfs2_glock_iter *gi = seq->private; | |
1957 | gi->sdp = inode->i_private; | |
88ffbf3e | 1958 | gi->last_pos = 0; |
0fe2f1e9 | 1959 | seq->buf = kmalloc(GFS2_SEQ_GOODSIZE, GFP_KERNEL | __GFP_NOWARN); |
df5d2f55 | 1960 | if (seq->buf) |
0fe2f1e9 | 1961 | seq->size = GFS2_SEQ_GOODSIZE; |
88ffbf3e | 1962 | gi->gl = NULL; |
8f6fd83c | 1963 | ret = rhashtable_walk_init(&gl_hash_table, &gi->hti, GFP_KERNEL); |
a245769f SW |
1964 | } |
1965 | return ret; | |
1966 | } | |
1967 | ||
1968 | static int gfs2_sbstats_open(struct inode *inode, struct file *file) | |
1969 | { | |
81648d04 | 1970 | int ret = seq_open(file, &gfs2_sbstats_seq_ops); |
a245769f SW |
1971 | if (ret == 0) { |
1972 | struct seq_file *seq = file->private_data; | |
81648d04 | 1973 | seq->private = inode->i_private; /* sdp */ |
a245769f SW |
1974 | } |
1975 | return ret; | |
1976 | } | |
1977 | ||
1978 | static const struct file_operations gfs2_glocks_fops = { | |
1979 | .owner = THIS_MODULE, | |
1980 | .open = gfs2_glocks_open, | |
1981 | .read = seq_read, | |
1982 | .llseek = seq_lseek, | |
88ffbf3e | 1983 | .release = gfs2_glocks_release, |
a245769f SW |
1984 | }; |
1985 | ||
1986 | static const struct file_operations gfs2_glstats_fops = { | |
7c52b166 | 1987 | .owner = THIS_MODULE, |
a245769f SW |
1988 | .open = gfs2_glstats_open, |
1989 | .read = seq_read, | |
1990 | .llseek = seq_lseek, | |
88ffbf3e | 1991 | .release = gfs2_glocks_release, |
a245769f SW |
1992 | }; |
1993 | ||
1994 | static const struct file_operations gfs2_sbstats_fops = { | |
1995 | .owner = THIS_MODULE, | |
1996 | .open = gfs2_sbstats_open, | |
7c52b166 RP |
1997 | .read = seq_read, |
1998 | .llseek = seq_lseek, | |
81648d04 | 1999 | .release = seq_release, |
7c52b166 RP |
2000 | }; |
2001 | ||
2002 | int gfs2_create_debugfs_file(struct gfs2_sbd *sdp) | |
2003 | { | |
7b4ddfa7 CS |
2004 | struct dentry *dent; |
2005 | ||
2006 | dent = debugfs_create_dir(sdp->sd_table_name, gfs2_root); | |
2007 | if (IS_ERR_OR_NULL(dent)) | |
2008 | goto fail; | |
2009 | sdp->debugfs_dir = dent; | |
2010 | ||
2011 | dent = debugfs_create_file("glocks", | |
2012 | S_IFREG | S_IRUGO, | |
2013 | sdp->debugfs_dir, sdp, | |
2014 | &gfs2_glocks_fops); | |
2015 | if (IS_ERR_OR_NULL(dent)) | |
a245769f | 2016 | goto fail; |
7b4ddfa7 | 2017 | sdp->debugfs_dentry_glocks = dent; |
a245769f | 2018 | |
7b4ddfa7 CS |
2019 | dent = debugfs_create_file("glstats", |
2020 | S_IFREG | S_IRUGO, | |
2021 | sdp->debugfs_dir, sdp, | |
2022 | &gfs2_glstats_fops); | |
2023 | if (IS_ERR_OR_NULL(dent)) | |
a245769f | 2024 | goto fail; |
7b4ddfa7 | 2025 | sdp->debugfs_dentry_glstats = dent; |
a245769f | 2026 | |
7b4ddfa7 CS |
2027 | dent = debugfs_create_file("sbstats", |
2028 | S_IFREG | S_IRUGO, | |
2029 | sdp->debugfs_dir, sdp, | |
2030 | &gfs2_sbstats_fops); | |
2031 | if (IS_ERR_OR_NULL(dent)) | |
a245769f | 2032 | goto fail; |
7b4ddfa7 | 2033 | sdp->debugfs_dentry_sbstats = dent; |
7c52b166 RP |
2034 | |
2035 | return 0; | |
a245769f SW |
2036 | fail: |
2037 | gfs2_delete_debugfs_file(sdp); | |
7b4ddfa7 | 2038 | return dent ? PTR_ERR(dent) : -ENOMEM; |
7c52b166 RP |
2039 | } |
2040 | ||
2041 | void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp) | |
2042 | { | |
a245769f | 2043 | if (sdp->debugfs_dir) { |
5f882096 RP |
2044 | if (sdp->debugfs_dentry_glocks) { |
2045 | debugfs_remove(sdp->debugfs_dentry_glocks); | |
2046 | sdp->debugfs_dentry_glocks = NULL; | |
2047 | } | |
a245769f SW |
2048 | if (sdp->debugfs_dentry_glstats) { |
2049 | debugfs_remove(sdp->debugfs_dentry_glstats); | |
2050 | sdp->debugfs_dentry_glstats = NULL; | |
2051 | } | |
2052 | if (sdp->debugfs_dentry_sbstats) { | |
2053 | debugfs_remove(sdp->debugfs_dentry_sbstats); | |
2054 | sdp->debugfs_dentry_sbstats = NULL; | |
2055 | } | |
5f882096 RP |
2056 | debugfs_remove(sdp->debugfs_dir); |
2057 | sdp->debugfs_dir = NULL; | |
2058 | } | |
7c52b166 RP |
2059 | } |
2060 | ||
2061 | int gfs2_register_debugfs(void) | |
2062 | { | |
2063 | gfs2_root = debugfs_create_dir("gfs2", NULL); | |
7b4ddfa7 CS |
2064 | if (IS_ERR(gfs2_root)) |
2065 | return PTR_ERR(gfs2_root); | |
7c52b166 RP |
2066 | return gfs2_root ? 0 : -ENOMEM; |
2067 | } | |
2068 | ||
2069 | void gfs2_unregister_debugfs(void) | |
2070 | { | |
2071 | debugfs_remove(gfs2_root); | |
5f882096 | 2072 | gfs2_root = NULL; |
7c52b166 | 2073 | } |