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 | ||
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> |
b3b94faa | 24 | #include <asm/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 |
087efdd3 | 72 | #define GFS2_GL_HASH_SIZE (1 << 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; |
044b9414 | 578 | struct gfs2_inode *ip; |
b94a170e | 579 | struct inode *inode; |
044b9414 SW |
580 | u64 no_addr = gl->gl_name.ln_number; |
581 | ||
a4923865 BP |
582 | /* If someone's using this glock to create a new dinode, the block must |
583 | have been freed by another node, then re-used, in which case our | |
584 | iopen callback is too late after the fact. Ignore it. */ | |
585 | if (test_bit(GLF_INODE_CREATING, &gl->gl_flags)) | |
586 | goto out; | |
587 | ||
044b9414 SW |
588 | ip = gl->gl_object; |
589 | /* Note: Unsafe to dereference ip as we don't hold right refs/locks */ | |
b94a170e | 590 | |
b94a170e | 591 | if (ip) |
ff34245d | 592 | inode = gfs2_ilookup(sdp->sd_vfs, no_addr); |
044b9414 SW |
593 | else |
594 | inode = gfs2_lookup_by_inum(sdp, no_addr, NULL, GFS2_BLKST_UNLINKED); | |
595 | if (inode && !IS_ERR(inode)) { | |
596 | d_prune_aliases(inode); | |
597 | iput(inode); | |
b94a170e | 598 | } |
a4923865 | 599 | out: |
b94a170e BM |
600 | gfs2_glock_put(gl); |
601 | } | |
602 | ||
c4f68a13 BM |
603 | static void glock_work_func(struct work_struct *work) |
604 | { | |
6802e340 | 605 | unsigned long delay = 0; |
c4f68a13 | 606 | struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_work.work); |
26bb7505 | 607 | int drop_ref = 0; |
c4f68a13 | 608 | |
26bb7505 | 609 | if (test_and_clear_bit(GLF_REPLY_PENDING, &gl->gl_flags)) { |
6802e340 | 610 | finish_xmote(gl, gl->gl_reply); |
26bb7505 SW |
611 | drop_ref = 1; |
612 | } | |
f3dd1649 | 613 | spin_lock(&gl->gl_lockref.lock); |
f90e5b5b | 614 | if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && |
265d529c SW |
615 | gl->gl_state != LM_ST_UNLOCKED && |
616 | gl->gl_demote_state != LM_ST_EXCLUSIVE) { | |
6802e340 | 617 | unsigned long holdtime, now = jiffies; |
f90e5b5b | 618 | |
7cf8dcd3 | 619 | holdtime = gl->gl_tchange + gl->gl_hold_time; |
6802e340 SW |
620 | if (time_before(now, holdtime)) |
621 | delay = holdtime - now; | |
f90e5b5b BP |
622 | |
623 | if (!delay) { | |
624 | clear_bit(GLF_PENDING_DEMOTE, &gl->gl_flags); | |
625 | set_bit(GLF_DEMOTE, &gl->gl_flags); | |
626 | } | |
6802e340 SW |
627 | } |
628 | run_queue(gl, 0); | |
f3dd1649 | 629 | spin_unlock(&gl->gl_lockref.lock); |
7cf8dcd3 | 630 | if (!delay) |
6802e340 | 631 | gfs2_glock_put(gl); |
7cf8dcd3 BP |
632 | else { |
633 | if (gl->gl_name.ln_type != LM_TYPE_INODE) | |
634 | delay = 0; | |
635 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0) | |
636 | gfs2_glock_put(gl); | |
637 | } | |
26bb7505 SW |
638 | if (drop_ref) |
639 | gfs2_glock_put(gl); | |
c4f68a13 BM |
640 | } |
641 | ||
b3b94faa DT |
642 | /** |
643 | * gfs2_glock_get() - Get a glock, or create one if one doesn't exist | |
644 | * @sdp: The GFS2 superblock | |
645 | * @number: the lock number | |
646 | * @glops: The glock_operations to use | |
647 | * @create: If 0, don't create the glock if it doesn't exist | |
648 | * @glp: the glock is returned here | |
649 | * | |
650 | * This does not lock a glock, just finds/creates structures for one. | |
651 | * | |
652 | * Returns: errno | |
653 | */ | |
654 | ||
cd915493 | 655 | int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 | 656 | const struct gfs2_glock_operations *glops, int create, |
b3b94faa DT |
657 | struct gfs2_glock **glp) |
658 | { | |
009d8518 | 659 | struct super_block *s = sdp->sd_vfs; |
15562c43 BP |
660 | struct lm_lockname name = { .ln_number = number, |
661 | .ln_type = glops->go_type, | |
662 | .ln_sbd = sdp }; | |
88ffbf3e | 663 | struct gfs2_glock *gl, *tmp = NULL; |
009d8518 | 664 | struct address_space *mapping; |
bc015cb8 | 665 | struct kmem_cache *cachep; |
88ffbf3e | 666 | int ret, tries = 0; |
b3b94faa | 667 | |
88ffbf3e BP |
668 | gl = rhashtable_lookup_fast(&gl_hash_table, &name, ht_parms); |
669 | if (gl && !lockref_get_not_dead(&gl->gl_lockref)) | |
670 | gl = NULL; | |
b3b94faa | 671 | |
64d576ba SW |
672 | *glp = gl; |
673 | if (gl) | |
b3b94faa | 674 | return 0; |
64d576ba SW |
675 | if (!create) |
676 | return -ENOENT; | |
b3b94faa | 677 | |
009d8518 | 678 | if (glops->go_flags & GLOF_ASPACE) |
bc015cb8 | 679 | cachep = gfs2_glock_aspace_cachep; |
009d8518 | 680 | else |
bc015cb8 | 681 | cachep = gfs2_glock_cachep; |
fe0bbd29 | 682 | gl = kmem_cache_alloc(cachep, GFP_NOFS); |
b3b94faa DT |
683 | if (!gl) |
684 | return -ENOMEM; | |
685 | ||
dba2d70c | 686 | memset(&gl->gl_lksb, 0, sizeof(struct dlm_lksb)); |
dba2d70c DT |
687 | |
688 | if (glops->go_flags & GLOF_LVB) { | |
fe0bbd29 | 689 | gl->gl_lksb.sb_lvbptr = kzalloc(GFS2_MIN_LVB_SIZE, GFP_NOFS); |
4e2f8849 | 690 | if (!gl->gl_lksb.sb_lvbptr) { |
dba2d70c DT |
691 | kmem_cache_free(cachep, gl); |
692 | return -ENOMEM; | |
693 | } | |
dba2d70c DT |
694 | } |
695 | ||
8f05228e | 696 | atomic_inc(&sdp->sd_glock_disposal); |
88ffbf3e | 697 | gl->gl_node.next = NULL; |
ec45d9f5 | 698 | gl->gl_flags = 0; |
b3b94faa | 699 | gl->gl_name = name; |
e66cf161 | 700 | gl->gl_lockref.count = 1; |
b3b94faa | 701 | gl->gl_state = LM_ST_UNLOCKED; |
6802e340 | 702 | gl->gl_target = LM_ST_UNLOCKED; |
c4f68a13 | 703 | gl->gl_demote_state = LM_ST_EXCLUSIVE; |
b3b94faa | 704 | gl->gl_ops = glops; |
a245769f SW |
705 | gl->gl_dstamp = ktime_set(0, 0); |
706 | preempt_disable(); | |
707 | /* We use the global stats to estimate the initial per-glock stats */ | |
708 | gl->gl_stats = this_cpu_ptr(sdp->sd_lkstats)->lkstats[glops->go_type]; | |
709 | preempt_enable(); | |
710 | gl->gl_stats.stats[GFS2_LKS_DCOUNT] = 0; | |
711 | gl->gl_stats.stats[GFS2_LKS_QCOUNT] = 0; | |
c4f68a13 | 712 | gl->gl_tchange = jiffies; |
ec45d9f5 | 713 | gl->gl_object = NULL; |
7cf8dcd3 | 714 | gl->gl_hold_time = GL_GLOCK_DFT_HOLD; |
c4f68a13 | 715 | INIT_DELAYED_WORK(&gl->gl_work, glock_work_func); |
b94a170e | 716 | INIT_WORK(&gl->gl_delete, delete_work_func); |
b3b94faa | 717 | |
009d8518 SW |
718 | mapping = gfs2_glock2aspace(gl); |
719 | if (mapping) { | |
720 | mapping->a_ops = &gfs2_meta_aops; | |
721 | mapping->host = s->s_bdev->bd_inode; | |
722 | mapping->flags = 0; | |
723 | mapping_set_gfp_mask(mapping, GFP_NOFS); | |
252aa6f5 | 724 | mapping->private_data = NULL; |
009d8518 | 725 | mapping->writeback_index = 0; |
b3b94faa DT |
726 | } |
727 | ||
88ffbf3e BP |
728 | again: |
729 | ret = rhashtable_lookup_insert_fast(&gl_hash_table, &gl->gl_node, | |
730 | ht_parms); | |
731 | if (ret == 0) { | |
732 | *glp = gl; | |
733 | return 0; | |
b3b94faa DT |
734 | } |
735 | ||
88ffbf3e BP |
736 | if (ret == -EEXIST) { |
737 | ret = 0; | |
738 | tmp = rhashtable_lookup_fast(&gl_hash_table, &name, ht_parms); | |
739 | if (tmp == NULL || !lockref_get_not_dead(&tmp->gl_lockref)) { | |
740 | if (++tries < 100) { | |
741 | cond_resched(); | |
742 | goto again; | |
743 | } | |
744 | tmp = NULL; | |
745 | ret = -ENOMEM; | |
746 | } | |
747 | } else { | |
748 | WARN_ON_ONCE(ret); | |
749 | } | |
750 | kfree(gl->gl_lksb.sb_lvbptr); | |
751 | kmem_cache_free(cachep, gl); | |
752 | atomic_dec(&sdp->sd_glock_disposal); | |
753 | *glp = tmp; | |
b3b94faa | 754 | |
88ffbf3e | 755 | return ret; |
b3b94faa DT |
756 | } |
757 | ||
758 | /** | |
759 | * gfs2_holder_init - initialize a struct gfs2_holder in the default way | |
760 | * @gl: the glock | |
761 | * @state: the state we're requesting | |
762 | * @flags: the modifier flags | |
763 | * @gh: the holder structure | |
764 | * | |
765 | */ | |
766 | ||
b58bf407 | 767 | void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, u16 flags, |
b3b94faa DT |
768 | struct gfs2_holder *gh) |
769 | { | |
770 | INIT_LIST_HEAD(&gh->gh_list); | |
771 | gh->gh_gl = gl; | |
d29c0afe | 772 | gh->gh_ip = _RET_IP_; |
b1e058da | 773 | gh->gh_owner_pid = get_pid(task_pid(current)); |
b3b94faa DT |
774 | gh->gh_state = state; |
775 | gh->gh_flags = flags; | |
776 | gh->gh_error = 0; | |
777 | gh->gh_iflags = 0; | |
b3b94faa DT |
778 | gfs2_glock_hold(gl); |
779 | } | |
780 | ||
781 | /** | |
782 | * gfs2_holder_reinit - reinitialize a struct gfs2_holder so we can requeue it | |
783 | * @state: the state we're requesting | |
784 | * @flags: the modifier flags | |
785 | * @gh: the holder structure | |
786 | * | |
787 | * Don't mess with the glock. | |
788 | * | |
789 | */ | |
790 | ||
b58bf407 | 791 | void gfs2_holder_reinit(unsigned int state, u16 flags, struct gfs2_holder *gh) |
b3b94faa DT |
792 | { |
793 | gh->gh_state = state; | |
579b78a4 | 794 | gh->gh_flags = flags; |
3b8249f6 | 795 | gh->gh_iflags = 0; |
d29c0afe | 796 | gh->gh_ip = _RET_IP_; |
30badc95 | 797 | put_pid(gh->gh_owner_pid); |
1a0eae88 | 798 | gh->gh_owner_pid = get_pid(task_pid(current)); |
b3b94faa DT |
799 | } |
800 | ||
801 | /** | |
802 | * gfs2_holder_uninit - uninitialize a holder structure (drop glock reference) | |
803 | * @gh: the holder structure | |
804 | * | |
805 | */ | |
806 | ||
807 | void gfs2_holder_uninit(struct gfs2_holder *gh) | |
808 | { | |
b1e058da | 809 | put_pid(gh->gh_owner_pid); |
b3b94faa DT |
810 | gfs2_glock_put(gh->gh_gl); |
811 | gh->gh_gl = NULL; | |
d0dc80db | 812 | gh->gh_ip = 0; |
b3b94faa DT |
813 | } |
814 | ||
07a79049 BP |
815 | /** |
816 | * gfs2_glock_wait - wait on a glock acquisition | |
817 | * @gh: the glock holder | |
818 | * | |
819 | * Returns: 0 on success | |
820 | */ | |
821 | ||
822 | int gfs2_glock_wait(struct gfs2_holder *gh) | |
da755fdb | 823 | { |
7cf8dcd3 BP |
824 | unsigned long time1 = jiffies; |
825 | ||
6802e340 | 826 | might_sleep(); |
74316201 | 827 | wait_on_bit(&gh->gh_iflags, HIF_WAIT, TASK_UNINTERRUPTIBLE); |
7cf8dcd3 BP |
828 | if (time_after(jiffies, time1 + HZ)) /* have we waited > a second? */ |
829 | /* Lengthen the minimum hold time. */ | |
830 | gh->gh_gl->gl_hold_time = min(gh->gh_gl->gl_hold_time + | |
831 | GL_GLOCK_HOLD_INCR, | |
832 | GL_GLOCK_MAX_HOLD); | |
07a79049 | 833 | return gh->gh_error; |
da755fdb SW |
834 | } |
835 | ||
b3b94faa | 836 | /** |
6802e340 SW |
837 | * handle_callback - process a demote request |
838 | * @gl: the glock | |
839 | * @state: the state the caller wants us to change to | |
b3b94faa | 840 | * |
6802e340 SW |
841 | * There are only two requests that we are going to see in actual |
842 | * practise: LM_ST_SHARED and LM_ST_UNLOCKED | |
b3b94faa DT |
843 | */ |
844 | ||
6802e340 | 845 | static void handle_callback(struct gfs2_glock *gl, unsigned int state, |
81ffbf65 | 846 | unsigned long delay, bool remote) |
b3b94faa | 847 | { |
6802e340 | 848 | int bit = delay ? GLF_PENDING_DEMOTE : GLF_DEMOTE; |
b3b94faa | 849 | |
6802e340 SW |
850 | set_bit(bit, &gl->gl_flags); |
851 | if (gl->gl_demote_state == LM_ST_EXCLUSIVE) { | |
852 | gl->gl_demote_state = state; | |
853 | gl->gl_demote_time = jiffies; | |
6802e340 SW |
854 | } else if (gl->gl_demote_state != LM_ST_UNLOCKED && |
855 | gl->gl_demote_state != state) { | |
856 | gl->gl_demote_state = LM_ST_UNLOCKED; | |
b3b94faa | 857 | } |
b94a170e | 858 | if (gl->gl_ops->go_callback) |
81ffbf65 | 859 | gl->gl_ops->go_callback(gl, remote); |
7bd8b2eb | 860 | trace_gfs2_demote_rq(gl, remote); |
b3b94faa DT |
861 | } |
862 | ||
6802e340 | 863 | void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...) |
7c52b166 | 864 | { |
5e69069c | 865 | struct va_format vaf; |
7c52b166 RP |
866 | va_list args; |
867 | ||
868 | va_start(args, fmt); | |
5e69069c | 869 | |
6802e340 | 870 | if (seq) { |
1bb49303 | 871 | seq_vprintf(seq, fmt, args); |
6802e340 | 872 | } else { |
5e69069c JP |
873 | vaf.fmt = fmt; |
874 | vaf.va = &args; | |
875 | ||
d77d1b58 | 876 | pr_err("%pV", &vaf); |
6802e340 | 877 | } |
5e69069c | 878 | |
7c52b166 RP |
879 | va_end(args); |
880 | } | |
881 | ||
b3b94faa DT |
882 | /** |
883 | * add_to_queue - Add a holder to the wait queue (but look for recursion) | |
884 | * @gh: the holder structure to add | |
885 | * | |
6802e340 SW |
886 | * Eventually we should move the recursive locking trap to a |
887 | * debugging option or something like that. This is the fast | |
888 | * path and needs to have the minimum number of distractions. | |
889 | * | |
b3b94faa DT |
890 | */ |
891 | ||
6802e340 | 892 | static inline void add_to_queue(struct gfs2_holder *gh) |
f3dd1649 AG |
893 | __releases(&gl->gl_lockref.lock) |
894 | __acquires(&gl->gl_lockref.lock) | |
b3b94faa DT |
895 | { |
896 | struct gfs2_glock *gl = gh->gh_gl; | |
15562c43 | 897 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
6802e340 SW |
898 | struct list_head *insert_pt = NULL; |
899 | struct gfs2_holder *gh2; | |
e5dc76b9 | 900 | int try_futile = 0; |
b3b94faa | 901 | |
b1e058da | 902 | BUG_ON(gh->gh_owner_pid == NULL); |
fee852e3 SW |
903 | if (test_and_set_bit(HIF_WAIT, &gh->gh_iflags)) |
904 | BUG(); | |
190562bd | 905 | |
6802e340 SW |
906 | if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { |
907 | if (test_bit(GLF_LOCK, &gl->gl_flags)) | |
e5dc76b9 | 908 | try_futile = !may_grant(gl, gh); |
6802e340 SW |
909 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags)) |
910 | goto fail; | |
911 | } | |
912 | ||
913 | list_for_each_entry(gh2, &gl->gl_holders, gh_list) { | |
914 | if (unlikely(gh2->gh_owner_pid == gh->gh_owner_pid && | |
915 | (gh->gh_gl->gl_ops->go_type != LM_TYPE_FLOCK))) | |
916 | goto trap_recursive; | |
e5dc76b9 BP |
917 | if (try_futile && |
918 | !(gh2->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) { | |
6802e340 SW |
919 | fail: |
920 | gh->gh_error = GLR_TRYFAILED; | |
921 | gfs2_holder_wake(gh); | |
922 | return; | |
b4c20166 | 923 | } |
6802e340 SW |
924 | if (test_bit(HIF_HOLDER, &gh2->gh_iflags)) |
925 | continue; | |
926 | if (unlikely((gh->gh_flags & LM_FLAG_PRIORITY) && !insert_pt)) | |
927 | insert_pt = &gh2->gh_list; | |
928 | } | |
7b5e3d5f | 929 | set_bit(GLF_QUEUED, &gl->gl_flags); |
edae38a6 | 930 | trace_gfs2_glock_queue(gh, 1); |
a245769f SW |
931 | gfs2_glstats_inc(gl, GFS2_LKS_QCOUNT); |
932 | gfs2_sbstats_inc(gl, GFS2_LKS_QCOUNT); | |
6802e340 SW |
933 | if (likely(insert_pt == NULL)) { |
934 | list_add_tail(&gh->gh_list, &gl->gl_holders); | |
935 | if (unlikely(gh->gh_flags & LM_FLAG_PRIORITY)) | |
936 | goto do_cancel; | |
937 | return; | |
938 | } | |
939 | list_add_tail(&gh->gh_list, insert_pt); | |
940 | do_cancel: | |
941 | gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list); | |
942 | if (!(gh->gh_flags & LM_FLAG_PRIORITY)) { | |
f3dd1649 | 943 | spin_unlock(&gl->gl_lockref.lock); |
048bca22 | 944 | if (sdp->sd_lockstruct.ls_ops->lm_cancel) |
f057f6cd | 945 | sdp->sd_lockstruct.ls_ops->lm_cancel(gl); |
f3dd1649 | 946 | spin_lock(&gl->gl_lockref.lock); |
b3b94faa | 947 | } |
6802e340 | 948 | return; |
b3b94faa | 949 | |
6802e340 | 950 | trap_recursive: |
fc554ed3 FF |
951 | pr_err("original: %pSR\n", (void *)gh2->gh_ip); |
952 | pr_err("pid: %d\n", pid_nr(gh2->gh_owner_pid)); | |
953 | pr_err("lock type: %d req lock state : %d\n", | |
6802e340 | 954 | gh2->gh_gl->gl_name.ln_type, gh2->gh_state); |
fc554ed3 FF |
955 | pr_err("new: %pSR\n", (void *)gh->gh_ip); |
956 | pr_err("pid: %d\n", pid_nr(gh->gh_owner_pid)); | |
957 | pr_err("lock type: %d req lock state : %d\n", | |
6802e340 | 958 | gh->gh_gl->gl_name.ln_type, gh->gh_state); |
8eae1ca0 | 959 | gfs2_dump_glock(NULL, gl); |
6802e340 | 960 | BUG(); |
b3b94faa DT |
961 | } |
962 | ||
963 | /** | |
964 | * gfs2_glock_nq - enqueue a struct gfs2_holder onto a glock (acquire a glock) | |
965 | * @gh: the holder structure | |
966 | * | |
967 | * if (gh->gh_flags & GL_ASYNC), this never returns an error | |
968 | * | |
969 | * Returns: 0, GLR_TRYFAILED, or errno on failure | |
970 | */ | |
971 | ||
972 | int gfs2_glock_nq(struct gfs2_holder *gh) | |
973 | { | |
974 | struct gfs2_glock *gl = gh->gh_gl; | |
15562c43 | 975 | struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
b3b94faa DT |
976 | int error = 0; |
977 | ||
6802e340 | 978 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
b3b94faa | 979 | return -EIO; |
b3b94faa | 980 | |
f42ab085 SW |
981 | if (test_bit(GLF_LRU, &gl->gl_flags)) |
982 | gfs2_glock_remove_from_lru(gl); | |
983 | ||
f3dd1649 | 984 | spin_lock(&gl->gl_lockref.lock); |
b3b94faa | 985 | add_to_queue(gh); |
01b172b7 BP |
986 | if (unlikely((LM_FLAG_NOEXP & gh->gh_flags) && |
987 | test_and_clear_bit(GLF_FROZEN, &gl->gl_flags))) { | |
0809f6ec | 988 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
01b172b7 BP |
989 | gl->gl_lockref.count++; |
990 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) | |
991 | gl->gl_lockref.count--; | |
992 | } | |
6802e340 | 993 | run_queue(gl, 1); |
f3dd1649 | 994 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa | 995 | |
6802e340 SW |
996 | if (!(gh->gh_flags & GL_ASYNC)) |
997 | error = gfs2_glock_wait(gh); | |
b3b94faa | 998 | |
b3b94faa DT |
999 | return error; |
1000 | } | |
1001 | ||
1002 | /** | |
1003 | * gfs2_glock_poll - poll to see if an async request has been completed | |
1004 | * @gh: the holder | |
1005 | * | |
1006 | * Returns: 1 if the request is ready to be gfs2_glock_wait()ed on | |
1007 | */ | |
1008 | ||
1009 | int gfs2_glock_poll(struct gfs2_holder *gh) | |
1010 | { | |
6802e340 | 1011 | return test_bit(HIF_WAIT, &gh->gh_iflags) ? 0 : 1; |
b3b94faa DT |
1012 | } |
1013 | ||
1014 | /** | |
1015 | * gfs2_glock_dq - dequeue a struct gfs2_holder from a glock (release a glock) | |
1016 | * @gh: the glock holder | |
1017 | * | |
1018 | */ | |
1019 | ||
1020 | void gfs2_glock_dq(struct gfs2_holder *gh) | |
1021 | { | |
1022 | struct gfs2_glock *gl = gh->gh_gl; | |
8fb4b536 | 1023 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
c4f68a13 | 1024 | unsigned delay = 0; |
6802e340 | 1025 | int fast_path = 0; |
b3b94faa | 1026 | |
f3dd1649 | 1027 | spin_lock(&gl->gl_lockref.lock); |
b3b94faa | 1028 | if (gh->gh_flags & GL_NOCACHE) |
81ffbf65 | 1029 | handle_callback(gl, LM_ST_UNLOCKED, 0, false); |
b3b94faa | 1030 | |
b3b94faa | 1031 | list_del_init(&gh->gh_list); |
7508abc4 | 1032 | clear_bit(HIF_HOLDER, &gh->gh_iflags); |
6802e340 | 1033 | if (find_first_holder(gl) == NULL) { |
3042a2cc | 1034 | if (glops->go_unlock) { |
6802e340 | 1035 | GLOCK_BUG_ON(gl, test_and_set_bit(GLF_LOCK, &gl->gl_flags)); |
f3dd1649 | 1036 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa | 1037 | glops->go_unlock(gh); |
f3dd1649 | 1038 | spin_lock(&gl->gl_lockref.lock); |
6802e340 | 1039 | clear_bit(GLF_LOCK, &gl->gl_flags); |
3042a2cc | 1040 | } |
6802e340 SW |
1041 | if (list_empty(&gl->gl_holders) && |
1042 | !test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && | |
1043 | !test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
1044 | fast_path = 1; | |
b3b94faa | 1045 | } |
e7ccaf5f BP |
1046 | if (!test_bit(GLF_LFLUSH, &gl->gl_flags) && demote_ok(gl) && |
1047 | (glops->go_flags & GLOF_LRU)) | |
4abb6ad9 BP |
1048 | gfs2_glock_add_to_lru(gl); |
1049 | ||
63997775 | 1050 | trace_gfs2_glock_queue(gh, 0); |
f3dd1649 | 1051 | spin_unlock(&gl->gl_lockref.lock); |
6802e340 SW |
1052 | if (likely(fast_path)) |
1053 | return; | |
c4f68a13 BM |
1054 | |
1055 | gfs2_glock_hold(gl); | |
1056 | if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && | |
7cf8dcd3 BP |
1057 | !test_bit(GLF_DEMOTE, &gl->gl_flags) && |
1058 | gl->gl_name.ln_type == LM_TYPE_INODE) | |
1059 | delay = gl->gl_hold_time; | |
c4f68a13 BM |
1060 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0) |
1061 | gfs2_glock_put(gl); | |
b3b94faa DT |
1062 | } |
1063 | ||
d93cfa98 AD |
1064 | void gfs2_glock_dq_wait(struct gfs2_holder *gh) |
1065 | { | |
1066 | struct gfs2_glock *gl = gh->gh_gl; | |
1067 | gfs2_glock_dq(gh); | |
81e1d450 | 1068 | might_sleep(); |
74316201 | 1069 | wait_on_bit(&gl->gl_flags, GLF_DEMOTE, TASK_UNINTERRUPTIBLE); |
d93cfa98 AD |
1070 | } |
1071 | ||
b3b94faa DT |
1072 | /** |
1073 | * gfs2_glock_dq_uninit - dequeue a holder from a glock and initialize it | |
1074 | * @gh: the holder structure | |
1075 | * | |
1076 | */ | |
1077 | ||
1078 | void gfs2_glock_dq_uninit(struct gfs2_holder *gh) | |
1079 | { | |
1080 | gfs2_glock_dq(gh); | |
1081 | gfs2_holder_uninit(gh); | |
1082 | } | |
1083 | ||
1084 | /** | |
1085 | * gfs2_glock_nq_num - acquire a glock based on lock number | |
1086 | * @sdp: the filesystem | |
1087 | * @number: the lock number | |
1088 | * @glops: the glock operations for the type of glock | |
1089 | * @state: the state to acquire the glock in | |
25985edc | 1090 | * @flags: modifier flags for the acquisition |
b3b94faa DT |
1091 | * @gh: the struct gfs2_holder |
1092 | * | |
1093 | * Returns: errno | |
1094 | */ | |
1095 | ||
cd915493 | 1096 | int gfs2_glock_nq_num(struct gfs2_sbd *sdp, u64 number, |
8fb4b536 | 1097 | const struct gfs2_glock_operations *glops, |
b58bf407 | 1098 | unsigned int state, u16 flags, struct gfs2_holder *gh) |
b3b94faa DT |
1099 | { |
1100 | struct gfs2_glock *gl; | |
1101 | int error; | |
1102 | ||
1103 | error = gfs2_glock_get(sdp, number, glops, CREATE, &gl); | |
1104 | if (!error) { | |
1105 | error = gfs2_glock_nq_init(gl, state, flags, gh); | |
1106 | gfs2_glock_put(gl); | |
1107 | } | |
1108 | ||
1109 | return error; | |
1110 | } | |
1111 | ||
1112 | /** | |
1113 | * glock_compare - Compare two struct gfs2_glock structures for sorting | |
1114 | * @arg_a: the first structure | |
1115 | * @arg_b: the second structure | |
1116 | * | |
1117 | */ | |
1118 | ||
1119 | static int glock_compare(const void *arg_a, const void *arg_b) | |
1120 | { | |
a5e08a9e SW |
1121 | const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a; |
1122 | const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b; | |
1123 | const struct lm_lockname *a = &gh_a->gh_gl->gl_name; | |
1124 | const struct lm_lockname *b = &gh_b->gh_gl->gl_name; | |
b3b94faa DT |
1125 | |
1126 | if (a->ln_number > b->ln_number) | |
a5e08a9e SW |
1127 | return 1; |
1128 | if (a->ln_number < b->ln_number) | |
1129 | return -1; | |
1c0f4872 | 1130 | BUG_ON(gh_a->gh_gl->gl_ops->go_type == gh_b->gh_gl->gl_ops->go_type); |
a5e08a9e | 1131 | return 0; |
b3b94faa DT |
1132 | } |
1133 | ||
1134 | /** | |
1135 | * nq_m_sync - synchonously acquire more than one glock in deadlock free order | |
1136 | * @num_gh: the number of structures | |
1137 | * @ghs: an array of struct gfs2_holder structures | |
1138 | * | |
1139 | * Returns: 0 on success (all glocks acquired), | |
1140 | * errno on failure (no glocks acquired) | |
1141 | */ | |
1142 | ||
1143 | static int nq_m_sync(unsigned int num_gh, struct gfs2_holder *ghs, | |
1144 | struct gfs2_holder **p) | |
1145 | { | |
1146 | unsigned int x; | |
1147 | int error = 0; | |
1148 | ||
1149 | for (x = 0; x < num_gh; x++) | |
1150 | p[x] = &ghs[x]; | |
1151 | ||
1152 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare, NULL); | |
1153 | ||
1154 | for (x = 0; x < num_gh; x++) { | |
1155 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1156 | ||
1157 | error = gfs2_glock_nq(p[x]); | |
1158 | if (error) { | |
1159 | while (x--) | |
1160 | gfs2_glock_dq(p[x]); | |
1161 | break; | |
1162 | } | |
1163 | } | |
1164 | ||
1165 | return error; | |
1166 | } | |
1167 | ||
1168 | /** | |
1169 | * gfs2_glock_nq_m - acquire multiple glocks | |
1170 | * @num_gh: the number of structures | |
1171 | * @ghs: an array of struct gfs2_holder structures | |
1172 | * | |
b3b94faa DT |
1173 | * |
1174 | * Returns: 0 on success (all glocks acquired), | |
1175 | * errno on failure (no glocks acquired) | |
1176 | */ | |
1177 | ||
1178 | int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1179 | { | |
eaf5bd3c SW |
1180 | struct gfs2_holder *tmp[4]; |
1181 | struct gfs2_holder **pph = tmp; | |
b3b94faa DT |
1182 | int error = 0; |
1183 | ||
eaf5bd3c SW |
1184 | switch(num_gh) { |
1185 | case 0: | |
b3b94faa | 1186 | return 0; |
eaf5bd3c | 1187 | case 1: |
b3b94faa DT |
1188 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); |
1189 | return gfs2_glock_nq(ghs); | |
eaf5bd3c SW |
1190 | default: |
1191 | if (num_gh <= 4) | |
b3b94faa | 1192 | break; |
eaf5bd3c SW |
1193 | pph = kmalloc(num_gh * sizeof(struct gfs2_holder *), GFP_NOFS); |
1194 | if (!pph) | |
1195 | return -ENOMEM; | |
b3b94faa DT |
1196 | } |
1197 | ||
eaf5bd3c | 1198 | error = nq_m_sync(num_gh, ghs, pph); |
b3b94faa | 1199 | |
eaf5bd3c SW |
1200 | if (pph != tmp) |
1201 | kfree(pph); | |
b3b94faa DT |
1202 | |
1203 | return error; | |
1204 | } | |
1205 | ||
1206 | /** | |
1207 | * gfs2_glock_dq_m - release multiple glocks | |
1208 | * @num_gh: the number of structures | |
1209 | * @ghs: an array of struct gfs2_holder structures | |
1210 | * | |
1211 | */ | |
1212 | ||
1213 | void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs) | |
1214 | { | |
fa1bbdea BP |
1215 | while (num_gh--) |
1216 | gfs2_glock_dq(&ghs[num_gh]); | |
b3b94faa DT |
1217 | } |
1218 | ||
f057f6cd | 1219 | void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state) |
da755fdb | 1220 | { |
c4f68a13 BM |
1221 | unsigned long delay = 0; |
1222 | unsigned long holdtime; | |
1223 | unsigned long now = jiffies; | |
b3b94faa | 1224 | |
f057f6cd | 1225 | gfs2_glock_hold(gl); |
7cf8dcd3 BP |
1226 | holdtime = gl->gl_tchange + gl->gl_hold_time; |
1227 | if (test_bit(GLF_QUEUED, &gl->gl_flags) && | |
1228 | gl->gl_name.ln_type == LM_TYPE_INODE) { | |
7b5e3d5f SW |
1229 | if (time_before(now, holdtime)) |
1230 | delay = holdtime - now; | |
1231 | if (test_bit(GLF_REPLY_PENDING, &gl->gl_flags)) | |
7cf8dcd3 | 1232 | delay = gl->gl_hold_time; |
7b5e3d5f | 1233 | } |
b3b94faa | 1234 | |
f3dd1649 | 1235 | spin_lock(&gl->gl_lockref.lock); |
81ffbf65 | 1236 | handle_callback(gl, state, delay, true); |
f3dd1649 | 1237 | spin_unlock(&gl->gl_lockref.lock); |
c4f68a13 BM |
1238 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0) |
1239 | gfs2_glock_put(gl); | |
b3b94faa DT |
1240 | } |
1241 | ||
0809f6ec SW |
1242 | /** |
1243 | * gfs2_should_freeze - Figure out if glock should be frozen | |
1244 | * @gl: The glock in question | |
1245 | * | |
1246 | * Glocks are not frozen if (a) the result of the dlm operation is | |
1247 | * an error, (b) the locking operation was an unlock operation or | |
1248 | * (c) if there is a "noexp" flagged request anywhere in the queue | |
1249 | * | |
1250 | * Returns: 1 if freezing should occur, 0 otherwise | |
1251 | */ | |
1252 | ||
1253 | static int gfs2_should_freeze(const struct gfs2_glock *gl) | |
1254 | { | |
1255 | const struct gfs2_holder *gh; | |
1256 | ||
1257 | if (gl->gl_reply & ~LM_OUT_ST_MASK) | |
1258 | return 0; | |
1259 | if (gl->gl_target == LM_ST_UNLOCKED) | |
1260 | return 0; | |
1261 | ||
1262 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { | |
1263 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) | |
1264 | continue; | |
1265 | if (LM_FLAG_NOEXP & gh->gh_flags) | |
1266 | return 0; | |
1267 | } | |
1268 | ||
1269 | return 1; | |
1270 | } | |
1271 | ||
b3b94faa | 1272 | /** |
f057f6cd SW |
1273 | * gfs2_glock_complete - Callback used by locking |
1274 | * @gl: Pointer to the glock | |
1275 | * @ret: The return value from the dlm | |
b3b94faa | 1276 | * |
f3dd1649 | 1277 | * The gl_reply field is under the gl_lockref.lock lock so that it is ok |
47a25380 | 1278 | * to use a bitfield shared with other glock state fields. |
b3b94faa DT |
1279 | */ |
1280 | ||
f057f6cd | 1281 | void gfs2_glock_complete(struct gfs2_glock *gl, int ret) |
b3b94faa | 1282 | { |
15562c43 | 1283 | struct lm_lockstruct *ls = &gl->gl_name.ln_sbd->sd_lockstruct; |
0809f6ec | 1284 | |
f3dd1649 | 1285 | spin_lock(&gl->gl_lockref.lock); |
f057f6cd | 1286 | gl->gl_reply = ret; |
0809f6ec | 1287 | |
e0c2a9aa | 1288 | if (unlikely(test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))) { |
0809f6ec | 1289 | if (gfs2_should_freeze(gl)) { |
f057f6cd | 1290 | set_bit(GLF_FROZEN, &gl->gl_flags); |
f3dd1649 | 1291 | spin_unlock(&gl->gl_lockref.lock); |
b3b94faa | 1292 | return; |
0809f6ec | 1293 | } |
b3b94faa | 1294 | } |
47a25380 | 1295 | |
e66cf161 | 1296 | gl->gl_lockref.count++; |
f057f6cd | 1297 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
f3dd1649 | 1298 | spin_unlock(&gl->gl_lockref.lock); |
e66cf161 | 1299 | |
f057f6cd SW |
1300 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
1301 | gfs2_glock_put(gl); | |
b3b94faa DT |
1302 | } |
1303 | ||
4506a519 SW |
1304 | static int glock_cmp(void *priv, struct list_head *a, struct list_head *b) |
1305 | { | |
1306 | struct gfs2_glock *gla, *glb; | |
1307 | ||
1308 | gla = list_entry(a, struct gfs2_glock, gl_lru); | |
1309 | glb = list_entry(b, struct gfs2_glock, gl_lru); | |
1310 | ||
1311 | if (gla->gl_name.ln_number > glb->gl_name.ln_number) | |
1312 | return 1; | |
1313 | if (gla->gl_name.ln_number < glb->gl_name.ln_number) | |
1314 | return -1; | |
1315 | ||
1316 | return 0; | |
1317 | } | |
1318 | ||
1319 | /** | |
1320 | * gfs2_dispose_glock_lru - Demote a list of glocks | |
1321 | * @list: The list to dispose of | |
1322 | * | |
1323 | * Disposing of glocks may involve disk accesses, so that here we sort | |
1324 | * the glocks by number (i.e. disk location of the inodes) so that if | |
1325 | * there are any such accesses, they'll be sent in order (mostly). | |
1326 | * | |
1327 | * Must be called under the lru_lock, but may drop and retake this | |
1328 | * lock. While the lru_lock is dropped, entries may vanish from the | |
1329 | * list, but no new entries will appear on the list (since it is | |
1330 | * private) | |
1331 | */ | |
1332 | ||
1333 | static void gfs2_dispose_glock_lru(struct list_head *list) | |
1334 | __releases(&lru_lock) | |
1335 | __acquires(&lru_lock) | |
1336 | { | |
1337 | struct gfs2_glock *gl; | |
1338 | ||
1339 | list_sort(NULL, list, glock_cmp); | |
1340 | ||
1341 | while(!list_empty(list)) { | |
1342 | gl = list_entry(list->next, struct gfs2_glock, gl_lru); | |
1343 | list_del_init(&gl->gl_lru); | |
f3dd1649 | 1344 | if (!spin_trylock(&gl->gl_lockref.lock)) { |
94a09a39 | 1345 | add_back_to_lru: |
e66cf161 SW |
1346 | list_add(&gl->gl_lru, &lru_list); |
1347 | atomic_inc(&lru_count); | |
1348 | continue; | |
1349 | } | |
94a09a39 | 1350 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) { |
f3dd1649 | 1351 | spin_unlock(&gl->gl_lockref.lock); |
94a09a39 SW |
1352 | goto add_back_to_lru; |
1353 | } | |
4506a519 | 1354 | clear_bit(GLF_LRU, &gl->gl_flags); |
e66cf161 | 1355 | gl->gl_lockref.count++; |
4506a519 | 1356 | if (demote_ok(gl)) |
81ffbf65 | 1357 | handle_callback(gl, LM_ST_UNLOCKED, 0, false); |
4506a519 | 1358 | WARN_ON(!test_and_clear_bit(GLF_LOCK, &gl->gl_flags)); |
4506a519 | 1359 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
e66cf161 | 1360 | gl->gl_lockref.count--; |
f3dd1649 | 1361 | spin_unlock(&gl->gl_lockref.lock); |
94a09a39 | 1362 | cond_resched_lock(&lru_lock); |
4506a519 SW |
1363 | } |
1364 | } | |
1365 | ||
2a005855 SW |
1366 | /** |
1367 | * gfs2_scan_glock_lru - Scan the LRU looking for locks to demote | |
1368 | * @nr: The number of entries to scan | |
1369 | * | |
4506a519 SW |
1370 | * This function selects the entries on the LRU which are able to |
1371 | * be demoted, and then kicks off the process by calling | |
1372 | * gfs2_dispose_glock_lru() above. | |
2a005855 | 1373 | */ |
b3b94faa | 1374 | |
1ab6c499 | 1375 | static long gfs2_scan_glock_lru(int nr) |
b3b94faa DT |
1376 | { |
1377 | struct gfs2_glock *gl; | |
97cc1025 | 1378 | LIST_HEAD(skipped); |
4506a519 | 1379 | LIST_HEAD(dispose); |
1ab6c499 | 1380 | long freed = 0; |
b3b94faa | 1381 | |
97cc1025 | 1382 | spin_lock(&lru_lock); |
1ab6c499 | 1383 | while ((nr-- >= 0) && !list_empty(&lru_list)) { |
97cc1025 | 1384 | gl = list_entry(lru_list.next, struct gfs2_glock, gl_lru); |
97cc1025 SW |
1385 | |
1386 | /* Test for being demotable */ | |
94a09a39 | 1387 | if (!test_bit(GLF_LOCK, &gl->gl_flags)) { |
4506a519 SW |
1388 | list_move(&gl->gl_lru, &dispose); |
1389 | atomic_dec(&lru_count); | |
1ab6c499 | 1390 | freed++; |
2163b1e6 | 1391 | continue; |
97cc1025 | 1392 | } |
4506a519 SW |
1393 | |
1394 | list_move(&gl->gl_lru, &skipped); | |
b3b94faa | 1395 | } |
97cc1025 | 1396 | list_splice(&skipped, &lru_list); |
4506a519 SW |
1397 | if (!list_empty(&dispose)) |
1398 | gfs2_dispose_glock_lru(&dispose); | |
97cc1025 | 1399 | spin_unlock(&lru_lock); |
1ab6c499 DC |
1400 | |
1401 | return freed; | |
2a005855 SW |
1402 | } |
1403 | ||
1ab6c499 DC |
1404 | static unsigned long gfs2_glock_shrink_scan(struct shrinker *shrink, |
1405 | struct shrink_control *sc) | |
2a005855 | 1406 | { |
1ab6c499 DC |
1407 | if (!(sc->gfp_mask & __GFP_FS)) |
1408 | return SHRINK_STOP; | |
1409 | return gfs2_scan_glock_lru(sc->nr_to_scan); | |
1410 | } | |
2a005855 | 1411 | |
1ab6c499 DC |
1412 | static unsigned long gfs2_glock_shrink_count(struct shrinker *shrink, |
1413 | struct shrink_control *sc) | |
1414 | { | |
55f841ce | 1415 | return vfs_pressure_ratio(atomic_read(&lru_count)); |
b3b94faa DT |
1416 | } |
1417 | ||
97cc1025 | 1418 | static struct shrinker glock_shrinker = { |
97cc1025 | 1419 | .seeks = DEFAULT_SEEKS, |
1ab6c499 DC |
1420 | .count_objects = gfs2_glock_shrink_count, |
1421 | .scan_objects = gfs2_glock_shrink_scan, | |
97cc1025 SW |
1422 | }; |
1423 | ||
b3b94faa DT |
1424 | /** |
1425 | * examine_bucket - Call a function for glock in a hash bucket | |
1426 | * @examiner: the function | |
1427 | * @sdp: the filesystem | |
1428 | * @bucket: the bucket | |
1429 | * | |
b3b94faa DT |
1430 | */ |
1431 | ||
88ffbf3e | 1432 | static void glock_hash_walk(glock_examiner examiner, const struct gfs2_sbd *sdp) |
b3b94faa | 1433 | { |
bc015cb8 | 1434 | struct gfs2_glock *gl; |
3dd1dd8c | 1435 | struct rhash_head *pos; |
88ffbf3e BP |
1436 | const struct bucket_table *tbl; |
1437 | int i; | |
b3b94faa | 1438 | |
bc015cb8 | 1439 | rcu_read_lock(); |
88ffbf3e BP |
1440 | tbl = rht_dereference_rcu(gl_hash_table.tbl, &gl_hash_table); |
1441 | for (i = 0; i < tbl->size; i++) { | |
3dd1dd8c | 1442 | rht_for_each_entry_rcu(gl, pos, tbl, i, gl_node) { |
88ffbf3e BP |
1443 | if ((gl->gl_name.ln_sbd == sdp) && |
1444 | lockref_get_not_dead(&gl->gl_lockref)) | |
1445 | examiner(gl); | |
1446 | } | |
b3b94faa | 1447 | } |
bc015cb8 | 1448 | rcu_read_unlock(); |
8fbbfd21 | 1449 | cond_resched(); |
bc015cb8 SW |
1450 | } |
1451 | ||
f057f6cd SW |
1452 | /** |
1453 | * thaw_glock - thaw out a glock which has an unprocessed reply waiting | |
1454 | * @gl: The glock to thaw | |
1455 | * | |
f057f6cd SW |
1456 | */ |
1457 | ||
1458 | static void thaw_glock(struct gfs2_glock *gl) | |
1459 | { | |
1460 | if (!test_and_clear_bit(GLF_FROZEN, &gl->gl_flags)) | |
7286b31e | 1461 | goto out; |
f057f6cd | 1462 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
7286b31e SW |
1463 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) { |
1464 | out: | |
f057f6cd | 1465 | gfs2_glock_put(gl); |
7286b31e | 1466 | } |
f057f6cd SW |
1467 | } |
1468 | ||
b3b94faa DT |
1469 | /** |
1470 | * clear_glock - look at a glock and see if we can free it from glock cache | |
1471 | * @gl: the glock to look at | |
1472 | * | |
1473 | */ | |
1474 | ||
1475 | static void clear_glock(struct gfs2_glock *gl) | |
1476 | { | |
f42ab085 | 1477 | gfs2_glock_remove_from_lru(gl); |
b3b94faa | 1478 | |
f3dd1649 | 1479 | spin_lock(&gl->gl_lockref.lock); |
c741c455 | 1480 | if (gl->gl_state != LM_ST_UNLOCKED) |
81ffbf65 | 1481 | handle_callback(gl, LM_ST_UNLOCKED, 0, false); |
f3dd1649 | 1482 | spin_unlock(&gl->gl_lockref.lock); |
6802e340 SW |
1483 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
1484 | gfs2_glock_put(gl); | |
b3b94faa DT |
1485 | } |
1486 | ||
f057f6cd SW |
1487 | /** |
1488 | * gfs2_glock_thaw - Thaw any frozen glocks | |
1489 | * @sdp: The super block | |
1490 | * | |
1491 | */ | |
1492 | ||
1493 | void gfs2_glock_thaw(struct gfs2_sbd *sdp) | |
1494 | { | |
bc015cb8 SW |
1495 | glock_hash_walk(thaw_glock, sdp); |
1496 | } | |
f057f6cd | 1497 | |
ac3beb6a | 1498 | static void dump_glock(struct seq_file *seq, struct gfs2_glock *gl) |
bc015cb8 | 1499 | { |
f3dd1649 | 1500 | spin_lock(&gl->gl_lockref.lock); |
ac3beb6a | 1501 | gfs2_dump_glock(seq, gl); |
f3dd1649 | 1502 | spin_unlock(&gl->gl_lockref.lock); |
bc015cb8 SW |
1503 | } |
1504 | ||
1505 | static void dump_glock_func(struct gfs2_glock *gl) | |
1506 | { | |
1507 | dump_glock(NULL, gl); | |
f057f6cd SW |
1508 | } |
1509 | ||
b3b94faa DT |
1510 | /** |
1511 | * gfs2_gl_hash_clear - Empty out the glock hash table | |
1512 | * @sdp: the filesystem | |
1513 | * @wait: wait until it's all gone | |
1514 | * | |
1bdad606 | 1515 | * Called when unmounting the filesystem. |
b3b94faa DT |
1516 | */ |
1517 | ||
fefc03bf | 1518 | void gfs2_gl_hash_clear(struct gfs2_sbd *sdp) |
b3b94faa | 1519 | { |
fb6791d1 | 1520 | set_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags); |
222cb538 | 1521 | flush_workqueue(glock_workqueue); |
bc015cb8 | 1522 | glock_hash_walk(clear_glock, sdp); |
8f05228e | 1523 | flush_workqueue(glock_workqueue); |
2aba1b5b BP |
1524 | wait_event_timeout(sdp->sd_glock_wait, |
1525 | atomic_read(&sdp->sd_glock_disposal) == 0, | |
1526 | HZ * 600); | |
bc015cb8 | 1527 | glock_hash_walk(dump_glock_func, sdp); |
b3b94faa DT |
1528 | } |
1529 | ||
813e0c46 SW |
1530 | void gfs2_glock_finish_truncate(struct gfs2_inode *ip) |
1531 | { | |
1532 | struct gfs2_glock *gl = ip->i_gl; | |
1533 | int ret; | |
1534 | ||
1535 | ret = gfs2_truncatei_resume(ip); | |
15562c43 | 1536 | gfs2_assert_withdraw(gl->gl_name.ln_sbd, ret == 0); |
813e0c46 | 1537 | |
f3dd1649 | 1538 | spin_lock(&gl->gl_lockref.lock); |
813e0c46 SW |
1539 | clear_bit(GLF_LOCK, &gl->gl_flags); |
1540 | run_queue(gl, 1); | |
f3dd1649 | 1541 | spin_unlock(&gl->gl_lockref.lock); |
813e0c46 SW |
1542 | } |
1543 | ||
6802e340 | 1544 | static const char *state2str(unsigned state) |
04b933f2 | 1545 | { |
6802e340 SW |
1546 | switch(state) { |
1547 | case LM_ST_UNLOCKED: | |
1548 | return "UN"; | |
1549 | case LM_ST_SHARED: | |
1550 | return "SH"; | |
1551 | case LM_ST_DEFERRED: | |
1552 | return "DF"; | |
1553 | case LM_ST_EXCLUSIVE: | |
1554 | return "EX"; | |
1555 | } | |
1556 | return "??"; | |
1557 | } | |
1558 | ||
b58bf407 | 1559 | static const char *hflags2str(char *buf, u16 flags, unsigned long iflags) |
6802e340 SW |
1560 | { |
1561 | char *p = buf; | |
1562 | if (flags & LM_FLAG_TRY) | |
1563 | *p++ = 't'; | |
1564 | if (flags & LM_FLAG_TRY_1CB) | |
1565 | *p++ = 'T'; | |
1566 | if (flags & LM_FLAG_NOEXP) | |
1567 | *p++ = 'e'; | |
1568 | if (flags & LM_FLAG_ANY) | |
f057f6cd | 1569 | *p++ = 'A'; |
6802e340 SW |
1570 | if (flags & LM_FLAG_PRIORITY) |
1571 | *p++ = 'p'; | |
1572 | if (flags & GL_ASYNC) | |
1573 | *p++ = 'a'; | |
1574 | if (flags & GL_EXACT) | |
1575 | *p++ = 'E'; | |
6802e340 SW |
1576 | if (flags & GL_NOCACHE) |
1577 | *p++ = 'c'; | |
1578 | if (test_bit(HIF_HOLDER, &iflags)) | |
1579 | *p++ = 'H'; | |
1580 | if (test_bit(HIF_WAIT, &iflags)) | |
1581 | *p++ = 'W'; | |
1582 | if (test_bit(HIF_FIRST, &iflags)) | |
1583 | *p++ = 'F'; | |
1584 | *p = 0; | |
1585 | return buf; | |
04b933f2 RP |
1586 | } |
1587 | ||
b3b94faa DT |
1588 | /** |
1589 | * dump_holder - print information about a glock holder | |
6802e340 | 1590 | * @seq: the seq_file struct |
b3b94faa DT |
1591 | * @gh: the glock holder |
1592 | * | |
b3b94faa DT |
1593 | */ |
1594 | ||
ac3beb6a | 1595 | static void dump_holder(struct seq_file *seq, const struct gfs2_holder *gh) |
b3b94faa | 1596 | { |
6802e340 | 1597 | struct task_struct *gh_owner = NULL; |
6802e340 | 1598 | char flags_buf[32]; |
b3b94faa | 1599 | |
0b3a2c99 | 1600 | rcu_read_lock(); |
6802e340 | 1601 | if (gh->gh_owner_pid) |
b1e058da | 1602 | gh_owner = pid_task(gh->gh_owner_pid, PIDTYPE_PID); |
cc18152e JP |
1603 | gfs2_print_dbg(seq, " H: s:%s f:%s e:%d p:%ld [%s] %pS\n", |
1604 | state2str(gh->gh_state), | |
1605 | hflags2str(flags_buf, gh->gh_flags, gh->gh_iflags), | |
1606 | gh->gh_error, | |
1607 | gh->gh_owner_pid ? (long)pid_nr(gh->gh_owner_pid) : -1, | |
1608 | gh_owner ? gh_owner->comm : "(ended)", | |
1609 | (void *)gh->gh_ip); | |
0b3a2c99 | 1610 | rcu_read_unlock(); |
b3b94faa DT |
1611 | } |
1612 | ||
627c10b7 | 1613 | static const char *gflags2str(char *buf, const struct gfs2_glock *gl) |
6802e340 | 1614 | { |
627c10b7 | 1615 | const unsigned long *gflags = &gl->gl_flags; |
6802e340 | 1616 | char *p = buf; |
627c10b7 | 1617 | |
6802e340 SW |
1618 | if (test_bit(GLF_LOCK, gflags)) |
1619 | *p++ = 'l'; | |
6802e340 SW |
1620 | if (test_bit(GLF_DEMOTE, gflags)) |
1621 | *p++ = 'D'; | |
1622 | if (test_bit(GLF_PENDING_DEMOTE, gflags)) | |
1623 | *p++ = 'd'; | |
1624 | if (test_bit(GLF_DEMOTE_IN_PROGRESS, gflags)) | |
1625 | *p++ = 'p'; | |
1626 | if (test_bit(GLF_DIRTY, gflags)) | |
1627 | *p++ = 'y'; | |
1628 | if (test_bit(GLF_LFLUSH, gflags)) | |
1629 | *p++ = 'f'; | |
1630 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, gflags)) | |
1631 | *p++ = 'i'; | |
1632 | if (test_bit(GLF_REPLY_PENDING, gflags)) | |
1633 | *p++ = 'r'; | |
f057f6cd | 1634 | if (test_bit(GLF_INITIAL, gflags)) |
d8348de0 | 1635 | *p++ = 'I'; |
f057f6cd SW |
1636 | if (test_bit(GLF_FROZEN, gflags)) |
1637 | *p++ = 'F'; | |
7b5e3d5f SW |
1638 | if (test_bit(GLF_QUEUED, gflags)) |
1639 | *p++ = 'q'; | |
627c10b7 SW |
1640 | if (test_bit(GLF_LRU, gflags)) |
1641 | *p++ = 'L'; | |
1642 | if (gl->gl_object) | |
1643 | *p++ = 'o'; | |
a245769f SW |
1644 | if (test_bit(GLF_BLOCKING, gflags)) |
1645 | *p++ = 'b'; | |
6802e340 SW |
1646 | *p = 0; |
1647 | return buf; | |
b3b94faa DT |
1648 | } |
1649 | ||
1650 | /** | |
8eae1ca0 | 1651 | * gfs2_dump_glock - print information about a glock |
6802e340 | 1652 | * @seq: The seq_file struct |
b3b94faa | 1653 | * @gl: the glock |
6802e340 SW |
1654 | * |
1655 | * The file format is as follows: | |
1656 | * One line per object, capital letters are used to indicate objects | |
1657 | * G = glock, I = Inode, R = rgrp, H = holder. Glocks are not indented, | |
1658 | * other objects are indented by a single space and follow the glock to | |
1659 | * which they are related. Fields are indicated by lower case letters | |
1660 | * followed by a colon and the field value, except for strings which are in | |
1661 | * [] so that its possible to see if they are composed of spaces for | |
1662 | * example. The field's are n = number (id of the object), f = flags, | |
1663 | * t = type, s = state, r = refcount, e = error, p = pid. | |
b3b94faa | 1664 | * |
b3b94faa DT |
1665 | */ |
1666 | ||
ac3beb6a | 1667 | void gfs2_dump_glock(struct seq_file *seq, const struct gfs2_glock *gl) |
b3b94faa | 1668 | { |
6802e340 SW |
1669 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
1670 | unsigned long long dtime; | |
1671 | const struct gfs2_holder *gh; | |
1672 | char gflags_buf[32]; | |
b3b94faa | 1673 | |
6802e340 SW |
1674 | dtime = jiffies - gl->gl_demote_time; |
1675 | dtime *= 1000000/HZ; /* demote time in uSec */ | |
1676 | if (!test_bit(GLF_DEMOTE, &gl->gl_flags)) | |
1677 | dtime = 0; | |
7cf8dcd3 | 1678 | 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 |
1679 | state2str(gl->gl_state), |
1680 | gl->gl_name.ln_type, | |
1681 | (unsigned long long)gl->gl_name.ln_number, | |
627c10b7 | 1682 | gflags2str(gflags_buf, gl), |
6802e340 SW |
1683 | state2str(gl->gl_target), |
1684 | state2str(gl->gl_demote_state), dtime, | |
6802e340 | 1685 | atomic_read(&gl->gl_ail_count), |
f42ab085 | 1686 | atomic_read(&gl->gl_revokes), |
e66cf161 | 1687 | (int)gl->gl_lockref.count, gl->gl_hold_time); |
b3b94faa | 1688 | |
ac3beb6a SW |
1689 | list_for_each_entry(gh, &gl->gl_holders, gh_list) |
1690 | dump_holder(seq, gh); | |
1691 | ||
6802e340 | 1692 | if (gl->gl_state != LM_ST_UNLOCKED && glops->go_dump) |
ac3beb6a | 1693 | glops->go_dump(seq, gl); |
b3b94faa DT |
1694 | } |
1695 | ||
a245769f SW |
1696 | static int gfs2_glstats_seq_show(struct seq_file *seq, void *iter_ptr) |
1697 | { | |
1698 | struct gfs2_glock *gl = iter_ptr; | |
1699 | ||
4d207133 | 1700 | seq_printf(seq, "G: n:%u/%llx rtt:%llu/%llu rttb:%llu/%llu irt:%llu/%llu dcnt: %llu qcnt: %llu\n", |
a245769f SW |
1701 | gl->gl_name.ln_type, |
1702 | (unsigned long long)gl->gl_name.ln_number, | |
4d207133 BH |
1703 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTT], |
1704 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTVAR], | |
1705 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTB], | |
1706 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTVARB], | |
1707 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SIRT], | |
1708 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SIRTVAR], | |
1709 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_DCOUNT], | |
1710 | (unsigned long long)gl->gl_stats.stats[GFS2_LKS_QCOUNT]); | |
a245769f SW |
1711 | return 0; |
1712 | } | |
1713 | ||
1714 | static const char *gfs2_gltype[] = { | |
1715 | "type", | |
1716 | "reserved", | |
1717 | "nondisk", | |
1718 | "inode", | |
1719 | "rgrp", | |
1720 | "meta", | |
1721 | "iopen", | |
1722 | "flock", | |
1723 | "plock", | |
1724 | "quota", | |
1725 | "journal", | |
1726 | }; | |
1727 | ||
1728 | static const char *gfs2_stype[] = { | |
1729 | [GFS2_LKS_SRTT] = "srtt", | |
1730 | [GFS2_LKS_SRTTVAR] = "srttvar", | |
1731 | [GFS2_LKS_SRTTB] = "srttb", | |
1732 | [GFS2_LKS_SRTTVARB] = "srttvarb", | |
1733 | [GFS2_LKS_SIRT] = "sirt", | |
1734 | [GFS2_LKS_SIRTVAR] = "sirtvar", | |
1735 | [GFS2_LKS_DCOUNT] = "dlm", | |
1736 | [GFS2_LKS_QCOUNT] = "queue", | |
1737 | }; | |
1738 | ||
1739 | #define GFS2_NR_SBSTATS (ARRAY_SIZE(gfs2_gltype) * ARRAY_SIZE(gfs2_stype)) | |
1740 | ||
1741 | static int gfs2_sbstats_seq_show(struct seq_file *seq, void *iter_ptr) | |
1742 | { | |
81648d04 AG |
1743 | struct gfs2_sbd *sdp = seq->private; |
1744 | loff_t pos = *(loff_t *)iter_ptr; | |
1745 | unsigned index = pos >> 3; | |
1746 | unsigned subindex = pos & 0x07; | |
a245769f SW |
1747 | int i; |
1748 | ||
1749 | if (index == 0 && subindex != 0) | |
1750 | return 0; | |
6802e340 | 1751 | |
a245769f SW |
1752 | seq_printf(seq, "%-10s %8s:", gfs2_gltype[index], |
1753 | (index == 0) ? "cpu": gfs2_stype[subindex]); | |
b3b94faa | 1754 | |
a245769f SW |
1755 | for_each_possible_cpu(i) { |
1756 | const struct gfs2_pcpu_lkstats *lkstats = per_cpu_ptr(sdp->sd_lkstats, i); | |
8f7e0a80 AG |
1757 | |
1758 | if (index == 0) | |
1759 | seq_printf(seq, " %15u", i); | |
1760 | else | |
1761 | seq_printf(seq, " %15llu", (unsigned long long)lkstats-> | |
1762 | lkstats[index - 1].stats[subindex]); | |
a245769f SW |
1763 | } |
1764 | seq_putc(seq, '\n'); | |
1765 | return 0; | |
1766 | } | |
8fbbfd21 | 1767 | |
85d1da67 SW |
1768 | int __init gfs2_glock_init(void) |
1769 | { | |
88ffbf3e BP |
1770 | int ret; |
1771 | ||
1772 | ret = rhashtable_init(&gl_hash_table, &ht_parms); | |
1773 | if (ret < 0) | |
1774 | return ret; | |
8fbbfd21 | 1775 | |
d2115778 | 1776 | glock_workqueue = alloc_workqueue("glock_workqueue", WQ_MEM_RECLAIM | |
58a69cb4 | 1777 | WQ_HIGHPRI | WQ_FREEZABLE, 0); |
88ffbf3e BP |
1778 | if (!glock_workqueue) { |
1779 | rhashtable_destroy(&gl_hash_table); | |
dfc4616d | 1780 | return -ENOMEM; |
88ffbf3e | 1781 | } |
d2115778 | 1782 | gfs2_delete_workqueue = alloc_workqueue("delete_workqueue", |
58a69cb4 | 1783 | WQ_MEM_RECLAIM | WQ_FREEZABLE, |
d2115778 | 1784 | 0); |
dfc4616d | 1785 | if (!gfs2_delete_workqueue) { |
b94a170e | 1786 | destroy_workqueue(glock_workqueue); |
88ffbf3e | 1787 | rhashtable_destroy(&gl_hash_table); |
dfc4616d | 1788 | return -ENOMEM; |
b94a170e | 1789 | } |
97cc1025 SW |
1790 | |
1791 | register_shrinker(&glock_shrinker); | |
c4f68a13 | 1792 | |
85d1da67 SW |
1793 | return 0; |
1794 | } | |
1795 | ||
8fbbfd21 SW |
1796 | void gfs2_glock_exit(void) |
1797 | { | |
97cc1025 | 1798 | unregister_shrinker(&glock_shrinker); |
88ffbf3e | 1799 | rhashtable_destroy(&gl_hash_table); |
c4f68a13 | 1800 | destroy_workqueue(glock_workqueue); |
b94a170e | 1801 | destroy_workqueue(gfs2_delete_workqueue); |
8fbbfd21 SW |
1802 | } |
1803 | ||
88ffbf3e | 1804 | static void gfs2_glock_iter_next(struct gfs2_glock_iter *gi) |
bc015cb8 | 1805 | { |
bc015cb8 | 1806 | do { |
88ffbf3e BP |
1807 | gi->gl = rhashtable_walk_next(&gi->hti); |
1808 | if (IS_ERR(gi->gl)) { | |
1809 | if (PTR_ERR(gi->gl) == -EAGAIN) | |
1810 | continue; | |
1811 | gi->gl = NULL; | |
bc015cb8 SW |
1812 | } |
1813 | /* Skip entries for other sb and dead entries */ | |
88ffbf3e BP |
1814 | } while ((gi->gl) && ((gi->sdp != gi->gl->gl_name.ln_sbd) || |
1815 | __lockref_is_dead(&gi->gl->gl_lockref))); | |
7c52b166 RP |
1816 | } |
1817 | ||
6802e340 | 1818 | static void *gfs2_glock_seq_start(struct seq_file *seq, loff_t *pos) |
7c52b166 | 1819 | { |
6802e340 | 1820 | struct gfs2_glock_iter *gi = seq->private; |
7c52b166 | 1821 | loff_t n = *pos; |
88ffbf3e | 1822 | int ret; |
7c52b166 | 1823 | |
ba1ddcb6 | 1824 | if (gi->last_pos <= *pos) |
88ffbf3e | 1825 | n = (*pos - gi->last_pos); |
ba1ddcb6 | 1826 | |
88ffbf3e BP |
1827 | ret = rhashtable_walk_start(&gi->hti); |
1828 | if (ret) | |
1829 | return NULL; | |
7c52b166 | 1830 | |
6802e340 | 1831 | do { |
88ffbf3e BP |
1832 | gfs2_glock_iter_next(gi); |
1833 | } while (gi->gl && n--); | |
7c52b166 | 1834 | |
ba1ddcb6 | 1835 | gi->last_pos = *pos; |
6802e340 | 1836 | return gi->gl; |
7c52b166 RP |
1837 | } |
1838 | ||
6802e340 | 1839 | static void *gfs2_glock_seq_next(struct seq_file *seq, void *iter_ptr, |
7c52b166 RP |
1840 | loff_t *pos) |
1841 | { | |
6802e340 | 1842 | struct gfs2_glock_iter *gi = seq->private; |
7c52b166 RP |
1843 | |
1844 | (*pos)++; | |
ba1ddcb6 | 1845 | gi->last_pos = *pos; |
88ffbf3e | 1846 | gfs2_glock_iter_next(gi); |
6802e340 | 1847 | return gi->gl; |
7c52b166 RP |
1848 | } |
1849 | ||
6802e340 | 1850 | static void gfs2_glock_seq_stop(struct seq_file *seq, void *iter_ptr) |
7c52b166 | 1851 | { |
6802e340 | 1852 | struct gfs2_glock_iter *gi = seq->private; |
bc015cb8 | 1853 | |
bc015cb8 | 1854 | gi->gl = NULL; |
88ffbf3e | 1855 | rhashtable_walk_stop(&gi->hti); |
7c52b166 RP |
1856 | } |
1857 | ||
6802e340 | 1858 | static int gfs2_glock_seq_show(struct seq_file *seq, void *iter_ptr) |
7c52b166 | 1859 | { |
ac3beb6a SW |
1860 | dump_glock(seq, iter_ptr); |
1861 | return 0; | |
7c52b166 RP |
1862 | } |
1863 | ||
a245769f SW |
1864 | static void *gfs2_sbstats_seq_start(struct seq_file *seq, loff_t *pos) |
1865 | { | |
81648d04 | 1866 | preempt_disable(); |
a245769f SW |
1867 | if (*pos >= GFS2_NR_SBSTATS) |
1868 | return NULL; | |
81648d04 | 1869 | return pos; |
a245769f SW |
1870 | } |
1871 | ||
1872 | static void *gfs2_sbstats_seq_next(struct seq_file *seq, void *iter_ptr, | |
1873 | loff_t *pos) | |
1874 | { | |
a245769f | 1875 | (*pos)++; |
81648d04 | 1876 | if (*pos >= GFS2_NR_SBSTATS) |
a245769f | 1877 | return NULL; |
81648d04 | 1878 | return pos; |
a245769f SW |
1879 | } |
1880 | ||
1881 | static void gfs2_sbstats_seq_stop(struct seq_file *seq, void *iter_ptr) | |
1882 | { | |
1883 | preempt_enable(); | |
1884 | } | |
1885 | ||
4ef29002 | 1886 | static const struct seq_operations gfs2_glock_seq_ops = { |
7c52b166 RP |
1887 | .start = gfs2_glock_seq_start, |
1888 | .next = gfs2_glock_seq_next, | |
1889 | .stop = gfs2_glock_seq_stop, | |
1890 | .show = gfs2_glock_seq_show, | |
1891 | }; | |
1892 | ||
a245769f SW |
1893 | static const struct seq_operations gfs2_glstats_seq_ops = { |
1894 | .start = gfs2_glock_seq_start, | |
1895 | .next = gfs2_glock_seq_next, | |
1896 | .stop = gfs2_glock_seq_stop, | |
1897 | .show = gfs2_glstats_seq_show, | |
1898 | }; | |
1899 | ||
1900 | static const struct seq_operations gfs2_sbstats_seq_ops = { | |
1901 | .start = gfs2_sbstats_seq_start, | |
1902 | .next = gfs2_sbstats_seq_next, | |
1903 | .stop = gfs2_sbstats_seq_stop, | |
1904 | .show = gfs2_sbstats_seq_show, | |
1905 | }; | |
1906 | ||
0fe2f1e9 SW |
1907 | #define GFS2_SEQ_GOODSIZE min(PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER, 65536UL) |
1908 | ||
a245769f | 1909 | static int gfs2_glocks_open(struct inode *inode, struct file *file) |
7c52b166 | 1910 | { |
6802e340 SW |
1911 | int ret = seq_open_private(file, &gfs2_glock_seq_ops, |
1912 | sizeof(struct gfs2_glock_iter)); | |
1913 | if (ret == 0) { | |
1914 | struct seq_file *seq = file->private_data; | |
1915 | struct gfs2_glock_iter *gi = seq->private; | |
88ffbf3e | 1916 | |
6802e340 | 1917 | gi->sdp = inode->i_private; |
88ffbf3e | 1918 | gi->last_pos = 0; |
0fe2f1e9 | 1919 | seq->buf = kmalloc(GFS2_SEQ_GOODSIZE, GFP_KERNEL | __GFP_NOWARN); |
df5d2f55 | 1920 | if (seq->buf) |
0fe2f1e9 | 1921 | seq->size = GFS2_SEQ_GOODSIZE; |
88ffbf3e | 1922 | gi->gl = NULL; |
8f6fd83c | 1923 | ret = rhashtable_walk_init(&gl_hash_table, &gi->hti, GFP_KERNEL); |
6802e340 SW |
1924 | } |
1925 | return ret; | |
7c52b166 RP |
1926 | } |
1927 | ||
88ffbf3e BP |
1928 | static int gfs2_glocks_release(struct inode *inode, struct file *file) |
1929 | { | |
1930 | struct seq_file *seq = file->private_data; | |
1931 | struct gfs2_glock_iter *gi = seq->private; | |
1932 | ||
1933 | gi->gl = NULL; | |
1934 | rhashtable_walk_exit(&gi->hti); | |
1935 | return seq_release_private(inode, file); | |
1936 | } | |
1937 | ||
a245769f SW |
1938 | static int gfs2_glstats_open(struct inode *inode, struct file *file) |
1939 | { | |
1940 | int ret = seq_open_private(file, &gfs2_glstats_seq_ops, | |
1941 | sizeof(struct gfs2_glock_iter)); | |
1942 | if (ret == 0) { | |
1943 | struct seq_file *seq = file->private_data; | |
1944 | struct gfs2_glock_iter *gi = seq->private; | |
1945 | gi->sdp = inode->i_private; | |
88ffbf3e | 1946 | gi->last_pos = 0; |
0fe2f1e9 | 1947 | seq->buf = kmalloc(GFS2_SEQ_GOODSIZE, GFP_KERNEL | __GFP_NOWARN); |
df5d2f55 | 1948 | if (seq->buf) |
0fe2f1e9 | 1949 | seq->size = GFS2_SEQ_GOODSIZE; |
88ffbf3e | 1950 | gi->gl = NULL; |
8f6fd83c | 1951 | ret = rhashtable_walk_init(&gl_hash_table, &gi->hti, GFP_KERNEL); |
a245769f SW |
1952 | } |
1953 | return ret; | |
1954 | } | |
1955 | ||
1956 | static int gfs2_sbstats_open(struct inode *inode, struct file *file) | |
1957 | { | |
81648d04 | 1958 | int ret = seq_open(file, &gfs2_sbstats_seq_ops); |
a245769f SW |
1959 | if (ret == 0) { |
1960 | struct seq_file *seq = file->private_data; | |
81648d04 | 1961 | seq->private = inode->i_private; /* sdp */ |
a245769f SW |
1962 | } |
1963 | return ret; | |
1964 | } | |
1965 | ||
1966 | static const struct file_operations gfs2_glocks_fops = { | |
1967 | .owner = THIS_MODULE, | |
1968 | .open = gfs2_glocks_open, | |
1969 | .read = seq_read, | |
1970 | .llseek = seq_lseek, | |
88ffbf3e | 1971 | .release = gfs2_glocks_release, |
a245769f SW |
1972 | }; |
1973 | ||
1974 | static const struct file_operations gfs2_glstats_fops = { | |
7c52b166 | 1975 | .owner = THIS_MODULE, |
a245769f SW |
1976 | .open = gfs2_glstats_open, |
1977 | .read = seq_read, | |
1978 | .llseek = seq_lseek, | |
88ffbf3e | 1979 | .release = gfs2_glocks_release, |
a245769f SW |
1980 | }; |
1981 | ||
1982 | static const struct file_operations gfs2_sbstats_fops = { | |
1983 | .owner = THIS_MODULE, | |
1984 | .open = gfs2_sbstats_open, | |
7c52b166 RP |
1985 | .read = seq_read, |
1986 | .llseek = seq_lseek, | |
81648d04 | 1987 | .release = seq_release, |
7c52b166 RP |
1988 | }; |
1989 | ||
1990 | int gfs2_create_debugfs_file(struct gfs2_sbd *sdp) | |
1991 | { | |
7b4ddfa7 CS |
1992 | struct dentry *dent; |
1993 | ||
1994 | dent = debugfs_create_dir(sdp->sd_table_name, gfs2_root); | |
1995 | if (IS_ERR_OR_NULL(dent)) | |
1996 | goto fail; | |
1997 | sdp->debugfs_dir = dent; | |
1998 | ||
1999 | dent = debugfs_create_file("glocks", | |
2000 | S_IFREG | S_IRUGO, | |
2001 | sdp->debugfs_dir, sdp, | |
2002 | &gfs2_glocks_fops); | |
2003 | if (IS_ERR_OR_NULL(dent)) | |
a245769f | 2004 | goto fail; |
7b4ddfa7 | 2005 | sdp->debugfs_dentry_glocks = dent; |
a245769f | 2006 | |
7b4ddfa7 CS |
2007 | dent = debugfs_create_file("glstats", |
2008 | S_IFREG | S_IRUGO, | |
2009 | sdp->debugfs_dir, sdp, | |
2010 | &gfs2_glstats_fops); | |
2011 | if (IS_ERR_OR_NULL(dent)) | |
a245769f | 2012 | goto fail; |
7b4ddfa7 | 2013 | sdp->debugfs_dentry_glstats = dent; |
a245769f | 2014 | |
7b4ddfa7 CS |
2015 | dent = debugfs_create_file("sbstats", |
2016 | S_IFREG | S_IRUGO, | |
2017 | sdp->debugfs_dir, sdp, | |
2018 | &gfs2_sbstats_fops); | |
2019 | if (IS_ERR_OR_NULL(dent)) | |
a245769f | 2020 | goto fail; |
7b4ddfa7 | 2021 | sdp->debugfs_dentry_sbstats = dent; |
7c52b166 RP |
2022 | |
2023 | return 0; | |
a245769f SW |
2024 | fail: |
2025 | gfs2_delete_debugfs_file(sdp); | |
7b4ddfa7 | 2026 | return dent ? PTR_ERR(dent) : -ENOMEM; |
7c52b166 RP |
2027 | } |
2028 | ||
2029 | void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp) | |
2030 | { | |
a245769f | 2031 | if (sdp->debugfs_dir) { |
5f882096 RP |
2032 | if (sdp->debugfs_dentry_glocks) { |
2033 | debugfs_remove(sdp->debugfs_dentry_glocks); | |
2034 | sdp->debugfs_dentry_glocks = NULL; | |
2035 | } | |
a245769f SW |
2036 | if (sdp->debugfs_dentry_glstats) { |
2037 | debugfs_remove(sdp->debugfs_dentry_glstats); | |
2038 | sdp->debugfs_dentry_glstats = NULL; | |
2039 | } | |
2040 | if (sdp->debugfs_dentry_sbstats) { | |
2041 | debugfs_remove(sdp->debugfs_dentry_sbstats); | |
2042 | sdp->debugfs_dentry_sbstats = NULL; | |
2043 | } | |
5f882096 RP |
2044 | debugfs_remove(sdp->debugfs_dir); |
2045 | sdp->debugfs_dir = NULL; | |
2046 | } | |
7c52b166 RP |
2047 | } |
2048 | ||
2049 | int gfs2_register_debugfs(void) | |
2050 | { | |
2051 | gfs2_root = debugfs_create_dir("gfs2", NULL); | |
7b4ddfa7 CS |
2052 | if (IS_ERR(gfs2_root)) |
2053 | return PTR_ERR(gfs2_root); | |
7c52b166 RP |
2054 | return gfs2_root ? 0 : -ENOMEM; |
2055 | } | |
2056 | ||
2057 | void gfs2_unregister_debugfs(void) | |
2058 | { | |
2059 | debugfs_remove(gfs2_root); | |
5f882096 | 2060 | gfs2_root = NULL; |
7c52b166 | 2061 | } |