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1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * dlmglue.c | |
5 | * | |
6 | * Code which implements an OCFS2 specific interface to our DLM. | |
7 | * | |
8 | * Copyright (C) 2003, 2004 Oracle. All rights reserved. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public | |
12 | * License as published by the Free Software Foundation; either | |
13 | * version 2 of the License, or (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public | |
21 | * License along with this program; if not, write to the | |
22 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | * Boston, MA 021110-1307, USA. | |
24 | */ | |
25 | ||
26 | #include <linux/types.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/highmem.h> | |
29 | #include <linux/mm.h> | |
30 | #include <linux/smp_lock.h> | |
31 | #include <linux/crc32.h> | |
32 | #include <linux/kthread.h> | |
33 | #include <linux/pagemap.h> | |
34 | #include <linux/debugfs.h> | |
35 | #include <linux/seq_file.h> | |
36 | ||
37 | #include <cluster/heartbeat.h> | |
38 | #include <cluster/nodemanager.h> | |
39 | #include <cluster/tcp.h> | |
40 | ||
41 | #include <dlm/dlmapi.h> | |
42 | ||
43 | #define MLOG_MASK_PREFIX ML_DLM_GLUE | |
44 | #include <cluster/masklog.h> | |
45 | ||
46 | #include "ocfs2.h" | |
47 | ||
48 | #include "alloc.h" | |
49 | #include "dlmglue.h" | |
50 | #include "extent_map.h" | |
51 | #include "heartbeat.h" | |
52 | #include "inode.h" | |
53 | #include "journal.h" | |
54 | #include "slot_map.h" | |
55 | #include "super.h" | |
56 | #include "uptodate.h" | |
57 | #include "vote.h" | |
58 | ||
59 | #include "buffer_head_io.h" | |
60 | ||
61 | struct ocfs2_mask_waiter { | |
62 | struct list_head mw_item; | |
63 | int mw_status; | |
64 | struct completion mw_complete; | |
65 | unsigned long mw_mask; | |
66 | unsigned long mw_goal; | |
67 | }; | |
68 | ||
69 | static void ocfs2_inode_ast_func(void *opaque); | |
70 | static void ocfs2_inode_bast_func(void *opaque, | |
71 | int level); | |
72 | static void ocfs2_super_ast_func(void *opaque); | |
73 | static void ocfs2_super_bast_func(void *opaque, | |
74 | int level); | |
75 | static void ocfs2_rename_ast_func(void *opaque); | |
76 | static void ocfs2_rename_bast_func(void *opaque, | |
77 | int level); | |
78 | ||
79 | /* so far, all locks have gotten along with the same unlock ast */ | |
80 | static void ocfs2_unlock_ast_func(void *opaque, | |
81 | enum dlm_status status); | |
82 | static int ocfs2_do_unblock_meta(struct inode *inode, | |
83 | int *requeue); | |
84 | static int ocfs2_unblock_meta(struct ocfs2_lock_res *lockres, | |
85 | int *requeue); | |
86 | static int ocfs2_unblock_data(struct ocfs2_lock_res *lockres, | |
87 | int *requeue); | |
88 | static int ocfs2_unblock_inode_lock(struct ocfs2_lock_res *lockres, | |
89 | int *requeue); | |
90 | static int ocfs2_unblock_osb_lock(struct ocfs2_lock_res *lockres, | |
91 | int *requeue); | |
92 | typedef void (ocfs2_convert_worker_t)(struct ocfs2_lock_res *, int); | |
93 | static int ocfs2_generic_unblock_lock(struct ocfs2_super *osb, | |
94 | struct ocfs2_lock_res *lockres, | |
95 | int *requeue, | |
96 | ocfs2_convert_worker_t *worker); | |
97 | ||
98 | struct ocfs2_lock_res_ops { | |
99 | void (*ast)(void *); | |
100 | void (*bast)(void *, int); | |
101 | void (*unlock_ast)(void *, enum dlm_status); | |
102 | int (*unblock)(struct ocfs2_lock_res *, int *); | |
103 | }; | |
104 | ||
105 | static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = { | |
106 | .ast = ocfs2_inode_ast_func, | |
107 | .bast = ocfs2_inode_bast_func, | |
108 | .unlock_ast = ocfs2_unlock_ast_func, | |
109 | .unblock = ocfs2_unblock_inode_lock, | |
110 | }; | |
111 | ||
112 | static struct ocfs2_lock_res_ops ocfs2_inode_meta_lops = { | |
113 | .ast = ocfs2_inode_ast_func, | |
114 | .bast = ocfs2_inode_bast_func, | |
115 | .unlock_ast = ocfs2_unlock_ast_func, | |
116 | .unblock = ocfs2_unblock_meta, | |
117 | }; | |
118 | ||
119 | static void ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, | |
120 | int blocking); | |
121 | ||
122 | static struct ocfs2_lock_res_ops ocfs2_inode_data_lops = { | |
123 | .ast = ocfs2_inode_ast_func, | |
124 | .bast = ocfs2_inode_bast_func, | |
125 | .unlock_ast = ocfs2_unlock_ast_func, | |
126 | .unblock = ocfs2_unblock_data, | |
127 | }; | |
128 | ||
129 | static struct ocfs2_lock_res_ops ocfs2_super_lops = { | |
130 | .ast = ocfs2_super_ast_func, | |
131 | .bast = ocfs2_super_bast_func, | |
132 | .unlock_ast = ocfs2_unlock_ast_func, | |
133 | .unblock = ocfs2_unblock_osb_lock, | |
134 | }; | |
135 | ||
136 | static struct ocfs2_lock_res_ops ocfs2_rename_lops = { | |
137 | .ast = ocfs2_rename_ast_func, | |
138 | .bast = ocfs2_rename_bast_func, | |
139 | .unlock_ast = ocfs2_unlock_ast_func, | |
140 | .unblock = ocfs2_unblock_osb_lock, | |
141 | }; | |
142 | ||
143 | static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres) | |
144 | { | |
145 | return lockres->l_type == OCFS2_LOCK_TYPE_META || | |
146 | lockres->l_type == OCFS2_LOCK_TYPE_DATA || | |
147 | lockres->l_type == OCFS2_LOCK_TYPE_RW; | |
148 | } | |
149 | ||
150 | static inline int ocfs2_is_super_lock(struct ocfs2_lock_res *lockres) | |
151 | { | |
152 | return lockres->l_type == OCFS2_LOCK_TYPE_SUPER; | |
153 | } | |
154 | ||
155 | static inline int ocfs2_is_rename_lock(struct ocfs2_lock_res *lockres) | |
156 | { | |
157 | return lockres->l_type == OCFS2_LOCK_TYPE_RENAME; | |
158 | } | |
159 | ||
160 | static inline struct ocfs2_super *ocfs2_lock_res_super(struct ocfs2_lock_res *lockres) | |
161 | { | |
162 | BUG_ON(!ocfs2_is_super_lock(lockres) | |
163 | && !ocfs2_is_rename_lock(lockres)); | |
164 | ||
165 | return (struct ocfs2_super *) lockres->l_priv; | |
166 | } | |
167 | ||
168 | static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres) | |
169 | { | |
170 | BUG_ON(!ocfs2_is_inode_lock(lockres)); | |
171 | ||
172 | return (struct inode *) lockres->l_priv; | |
173 | } | |
174 | ||
175 | static int ocfs2_lock_create(struct ocfs2_super *osb, | |
176 | struct ocfs2_lock_res *lockres, | |
177 | int level, | |
178 | int dlm_flags); | |
179 | static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, | |
180 | int wanted); | |
181 | static void ocfs2_cluster_unlock(struct ocfs2_super *osb, | |
182 | struct ocfs2_lock_res *lockres, | |
183 | int level); | |
184 | static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres); | |
185 | static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres); | |
186 | static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres); | |
187 | static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, int level); | |
188 | static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, | |
189 | struct ocfs2_lock_res *lockres); | |
190 | static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, | |
191 | int convert); | |
192 | #define ocfs2_log_dlm_error(_func, _stat, _lockres) do { \ | |
193 | mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \ | |
194 | "resource %s: %s\n", dlm_errname(_stat), _func, \ | |
195 | _lockres->l_name, dlm_errmsg(_stat)); \ | |
196 | } while (0) | |
197 | static void ocfs2_vote_on_unlock(struct ocfs2_super *osb, | |
198 | struct ocfs2_lock_res *lockres); | |
199 | static int ocfs2_meta_lock_update(struct inode *inode, | |
200 | struct buffer_head **bh); | |
201 | static void ocfs2_drop_osb_locks(struct ocfs2_super *osb); | |
202 | static inline int ocfs2_highest_compat_lock_level(int level); | |
203 | static inline int ocfs2_can_downconvert_meta_lock(struct inode *inode, | |
204 | struct ocfs2_lock_res *lockres, | |
205 | int new_level); | |
206 | ||
207 | static char *ocfs2_lock_type_strings[] = { | |
208 | [OCFS2_LOCK_TYPE_META] = "Meta", | |
209 | [OCFS2_LOCK_TYPE_DATA] = "Data", | |
210 | [OCFS2_LOCK_TYPE_SUPER] = "Super", | |
211 | [OCFS2_LOCK_TYPE_RENAME] = "Rename", | |
212 | /* Need to differntiate from [R]ename.. serializing writes is the | |
213 | * important job it does, anyway. */ | |
214 | [OCFS2_LOCK_TYPE_RW] = "Write/Read", | |
215 | }; | |
216 | ||
217 | static char *ocfs2_lock_type_string(enum ocfs2_lock_type type) | |
218 | { | |
219 | mlog_bug_on_msg(type >= OCFS2_NUM_LOCK_TYPES, "%d\n", type); | |
220 | return ocfs2_lock_type_strings[type]; | |
221 | } | |
222 | ||
223 | static void ocfs2_build_lock_name(enum ocfs2_lock_type type, | |
224 | u64 blkno, | |
225 | u32 generation, | |
226 | char *name) | |
227 | { | |
228 | int len; | |
229 | ||
230 | mlog_entry_void(); | |
231 | ||
232 | BUG_ON(type >= OCFS2_NUM_LOCK_TYPES); | |
233 | ||
234 | len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016"MLFx64"%08x", | |
235 | ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD, blkno, | |
236 | generation); | |
237 | ||
238 | BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1)); | |
239 | ||
240 | mlog(0, "built lock resource with name: %s\n", name); | |
241 | ||
242 | mlog_exit_void(); | |
243 | } | |
244 | ||
245 | static spinlock_t ocfs2_dlm_tracking_lock = SPIN_LOCK_UNLOCKED; | |
246 | ||
247 | static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res, | |
248 | struct ocfs2_dlm_debug *dlm_debug) | |
249 | { | |
250 | mlog(0, "Add tracking for lockres %s\n", res->l_name); | |
251 | ||
252 | spin_lock(&ocfs2_dlm_tracking_lock); | |
253 | list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking); | |
254 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
255 | } | |
256 | ||
257 | static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res) | |
258 | { | |
259 | spin_lock(&ocfs2_dlm_tracking_lock); | |
260 | if (!list_empty(&res->l_debug_list)) | |
261 | list_del_init(&res->l_debug_list); | |
262 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
263 | } | |
264 | ||
265 | static void ocfs2_lock_res_init_common(struct ocfs2_super *osb, | |
266 | struct ocfs2_lock_res *res, | |
267 | enum ocfs2_lock_type type, | |
268 | u64 blkno, | |
269 | u32 generation, | |
270 | struct ocfs2_lock_res_ops *ops, | |
271 | void *priv) | |
272 | { | |
273 | ocfs2_build_lock_name(type, blkno, generation, res->l_name); | |
274 | ||
275 | res->l_type = type; | |
276 | res->l_ops = ops; | |
277 | res->l_priv = priv; | |
278 | ||
279 | res->l_level = LKM_IVMODE; | |
280 | res->l_requested = LKM_IVMODE; | |
281 | res->l_blocking = LKM_IVMODE; | |
282 | res->l_action = OCFS2_AST_INVALID; | |
283 | res->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
284 | ||
285 | res->l_flags = OCFS2_LOCK_INITIALIZED; | |
286 | ||
287 | ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug); | |
288 | } | |
289 | ||
290 | void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res) | |
291 | { | |
292 | /* This also clears out the lock status block */ | |
293 | memset(res, 0, sizeof(struct ocfs2_lock_res)); | |
294 | spin_lock_init(&res->l_lock); | |
295 | init_waitqueue_head(&res->l_event); | |
296 | INIT_LIST_HEAD(&res->l_blocked_list); | |
297 | INIT_LIST_HEAD(&res->l_mask_waiters); | |
298 | } | |
299 | ||
300 | void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res, | |
301 | enum ocfs2_lock_type type, | |
302 | struct inode *inode) | |
303 | { | |
304 | struct ocfs2_lock_res_ops *ops; | |
305 | ||
306 | switch(type) { | |
307 | case OCFS2_LOCK_TYPE_RW: | |
308 | ops = &ocfs2_inode_rw_lops; | |
309 | break; | |
310 | case OCFS2_LOCK_TYPE_META: | |
311 | ops = &ocfs2_inode_meta_lops; | |
312 | break; | |
313 | case OCFS2_LOCK_TYPE_DATA: | |
314 | ops = &ocfs2_inode_data_lops; | |
315 | break; | |
316 | default: | |
317 | mlog_bug_on_msg(1, "type: %d\n", type); | |
318 | ops = NULL; /* thanks, gcc */ | |
319 | break; | |
320 | }; | |
321 | ||
322 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type, | |
323 | OCFS2_I(inode)->ip_blkno, | |
324 | inode->i_generation, ops, inode); | |
325 | } | |
326 | ||
327 | static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res, | |
328 | struct ocfs2_super *osb) | |
329 | { | |
330 | /* Superblock lockres doesn't come from a slab so we call init | |
331 | * once on it manually. */ | |
332 | ocfs2_lock_res_init_once(res); | |
333 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER, | |
334 | OCFS2_SUPER_BLOCK_BLKNO, 0, | |
335 | &ocfs2_super_lops, osb); | |
336 | } | |
337 | ||
338 | static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res, | |
339 | struct ocfs2_super *osb) | |
340 | { | |
341 | /* Rename lockres doesn't come from a slab so we call init | |
342 | * once on it manually. */ | |
343 | ocfs2_lock_res_init_once(res); | |
344 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME, 0, 0, | |
345 | &ocfs2_rename_lops, osb); | |
346 | } | |
347 | ||
348 | void ocfs2_lock_res_free(struct ocfs2_lock_res *res) | |
349 | { | |
350 | mlog_entry_void(); | |
351 | ||
352 | if (!(res->l_flags & OCFS2_LOCK_INITIALIZED)) | |
353 | return; | |
354 | ||
355 | ocfs2_remove_lockres_tracking(res); | |
356 | ||
357 | mlog_bug_on_msg(!list_empty(&res->l_blocked_list), | |
358 | "Lockres %s is on the blocked list\n", | |
359 | res->l_name); | |
360 | mlog_bug_on_msg(!list_empty(&res->l_mask_waiters), | |
361 | "Lockres %s has mask waiters pending\n", | |
362 | res->l_name); | |
363 | mlog_bug_on_msg(spin_is_locked(&res->l_lock), | |
364 | "Lockres %s is locked\n", | |
365 | res->l_name); | |
366 | mlog_bug_on_msg(res->l_ro_holders, | |
367 | "Lockres %s has %u ro holders\n", | |
368 | res->l_name, res->l_ro_holders); | |
369 | mlog_bug_on_msg(res->l_ex_holders, | |
370 | "Lockres %s has %u ex holders\n", | |
371 | res->l_name, res->l_ex_holders); | |
372 | ||
373 | /* Need to clear out the lock status block for the dlm */ | |
374 | memset(&res->l_lksb, 0, sizeof(res->l_lksb)); | |
375 | ||
376 | res->l_flags = 0UL; | |
377 | mlog_exit_void(); | |
378 | } | |
379 | ||
380 | static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres, | |
381 | int level) | |
382 | { | |
383 | mlog_entry_void(); | |
384 | ||
385 | BUG_ON(!lockres); | |
386 | ||
387 | switch(level) { | |
388 | case LKM_EXMODE: | |
389 | lockres->l_ex_holders++; | |
390 | break; | |
391 | case LKM_PRMODE: | |
392 | lockres->l_ro_holders++; | |
393 | break; | |
394 | default: | |
395 | BUG(); | |
396 | } | |
397 | ||
398 | mlog_exit_void(); | |
399 | } | |
400 | ||
401 | static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres, | |
402 | int level) | |
403 | { | |
404 | mlog_entry_void(); | |
405 | ||
406 | BUG_ON(!lockres); | |
407 | ||
408 | switch(level) { | |
409 | case LKM_EXMODE: | |
410 | BUG_ON(!lockres->l_ex_holders); | |
411 | lockres->l_ex_holders--; | |
412 | break; | |
413 | case LKM_PRMODE: | |
414 | BUG_ON(!lockres->l_ro_holders); | |
415 | lockres->l_ro_holders--; | |
416 | break; | |
417 | default: | |
418 | BUG(); | |
419 | } | |
420 | mlog_exit_void(); | |
421 | } | |
422 | ||
423 | /* WARNING: This function lives in a world where the only three lock | |
424 | * levels are EX, PR, and NL. It *will* have to be adjusted when more | |
425 | * lock types are added. */ | |
426 | static inline int ocfs2_highest_compat_lock_level(int level) | |
427 | { | |
428 | int new_level = LKM_EXMODE; | |
429 | ||
430 | if (level == LKM_EXMODE) | |
431 | new_level = LKM_NLMODE; | |
432 | else if (level == LKM_PRMODE) | |
433 | new_level = LKM_PRMODE; | |
434 | return new_level; | |
435 | } | |
436 | ||
437 | static void lockres_set_flags(struct ocfs2_lock_res *lockres, | |
438 | unsigned long newflags) | |
439 | { | |
440 | struct list_head *pos, *tmp; | |
441 | struct ocfs2_mask_waiter *mw; | |
442 | ||
443 | assert_spin_locked(&lockres->l_lock); | |
444 | ||
445 | lockres->l_flags = newflags; | |
446 | ||
447 | list_for_each_safe(pos, tmp, &lockres->l_mask_waiters) { | |
448 | mw = list_entry(pos, struct ocfs2_mask_waiter, mw_item); | |
449 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) | |
450 | continue; | |
451 | ||
452 | list_del_init(&mw->mw_item); | |
453 | mw->mw_status = 0; | |
454 | complete(&mw->mw_complete); | |
455 | } | |
456 | } | |
457 | static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or) | |
458 | { | |
459 | lockres_set_flags(lockres, lockres->l_flags | or); | |
460 | } | |
461 | static void lockres_clear_flags(struct ocfs2_lock_res *lockres, | |
462 | unsigned long clear) | |
463 | { | |
464 | lockres_set_flags(lockres, lockres->l_flags & ~clear); | |
465 | } | |
466 | ||
467 | static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres) | |
468 | { | |
469 | mlog_entry_void(); | |
470 | ||
471 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); | |
472 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); | |
473 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
474 | BUG_ON(lockres->l_blocking <= LKM_NLMODE); | |
475 | ||
476 | lockres->l_level = lockres->l_requested; | |
477 | if (lockres->l_level <= | |
478 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) { | |
479 | lockres->l_blocking = LKM_NLMODE; | |
480 | lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED); | |
481 | } | |
482 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
483 | ||
484 | mlog_exit_void(); | |
485 | } | |
486 | ||
487 | static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres) | |
488 | { | |
489 | mlog_entry_void(); | |
490 | ||
491 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); | |
492 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); | |
493 | ||
494 | /* Convert from RO to EX doesn't really need anything as our | |
495 | * information is already up to data. Convert from NL to | |
496 | * *anything* however should mark ourselves as needing an | |
497 | * update */ | |
498 | if (lockres->l_level == LKM_NLMODE) | |
499 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); | |
500 | ||
501 | lockres->l_level = lockres->l_requested; | |
502 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
503 | ||
504 | mlog_exit_void(); | |
505 | } | |
506 | ||
507 | static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres) | |
508 | { | |
509 | mlog_entry_void(); | |
510 | ||
511 | BUG_ON((!lockres->l_flags & OCFS2_LOCK_BUSY)); | |
512 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); | |
513 | ||
514 | if (lockres->l_requested > LKM_NLMODE && | |
515 | !(lockres->l_flags & OCFS2_LOCK_LOCAL)) | |
516 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); | |
517 | ||
518 | lockres->l_level = lockres->l_requested; | |
519 | lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED); | |
520 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
521 | ||
522 | mlog_exit_void(); | |
523 | } | |
524 | ||
525 | static void ocfs2_inode_ast_func(void *opaque) | |
526 | { | |
527 | struct ocfs2_lock_res *lockres = opaque; | |
528 | struct inode *inode; | |
529 | struct dlm_lockstatus *lksb; | |
530 | unsigned long flags; | |
531 | ||
532 | mlog_entry_void(); | |
533 | ||
534 | inode = ocfs2_lock_res_inode(lockres); | |
535 | ||
536 | mlog(0, "AST fired for inode %"MLFu64", l_action = %u, type = %s\n", | |
537 | OCFS2_I(inode)->ip_blkno, lockres->l_action, | |
538 | ocfs2_lock_type_string(lockres->l_type)); | |
539 | ||
540 | BUG_ON(!ocfs2_is_inode_lock(lockres)); | |
541 | ||
542 | spin_lock_irqsave(&lockres->l_lock, flags); | |
543 | ||
544 | lksb = &(lockres->l_lksb); | |
545 | if (lksb->status != DLM_NORMAL) { | |
546 | mlog(ML_ERROR, "ocfs2_inode_ast_func: lksb status value of %u " | |
547 | "on inode %"MLFu64"\n", lksb->status, | |
548 | OCFS2_I(inode)->ip_blkno); | |
549 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
550 | mlog_exit_void(); | |
551 | return; | |
552 | } | |
553 | ||
554 | switch(lockres->l_action) { | |
555 | case OCFS2_AST_ATTACH: | |
556 | ocfs2_generic_handle_attach_action(lockres); | |
557 | lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL); | |
558 | break; | |
559 | case OCFS2_AST_CONVERT: | |
560 | ocfs2_generic_handle_convert_action(lockres); | |
561 | break; | |
562 | case OCFS2_AST_DOWNCONVERT: | |
563 | ocfs2_generic_handle_downconvert_action(lockres); | |
564 | break; | |
565 | default: | |
566 | mlog(ML_ERROR, "lockres %s: ast fired with invalid action: %u " | |
567 | "lockres flags = 0x%lx, unlock action: %u\n", | |
568 | lockres->l_name, lockres->l_action, lockres->l_flags, | |
569 | lockres->l_unlock_action); | |
570 | ||
571 | BUG(); | |
572 | } | |
573 | ||
574 | /* data and rw locking ignores refresh flag for now. */ | |
575 | if (lockres->l_type != OCFS2_LOCK_TYPE_META) | |
576 | lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); | |
577 | ||
578 | /* set it to something invalid so if we get called again we | |
579 | * can catch it. */ | |
580 | lockres->l_action = OCFS2_AST_INVALID; | |
581 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
582 | wake_up(&lockres->l_event); | |
583 | ||
584 | mlog_exit_void(); | |
585 | } | |
586 | ||
587 | static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, | |
588 | int level) | |
589 | { | |
590 | int needs_downconvert = 0; | |
591 | mlog_entry_void(); | |
592 | ||
593 | assert_spin_locked(&lockres->l_lock); | |
594 | ||
595 | lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); | |
596 | ||
597 | if (level > lockres->l_blocking) { | |
598 | /* only schedule a downconvert if we haven't already scheduled | |
599 | * one that goes low enough to satisfy the level we're | |
600 | * blocking. this also catches the case where we get | |
601 | * duplicate BASTs */ | |
602 | if (ocfs2_highest_compat_lock_level(level) < | |
603 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) | |
604 | needs_downconvert = 1; | |
605 | ||
606 | lockres->l_blocking = level; | |
607 | } | |
608 | ||
609 | mlog_exit(needs_downconvert); | |
610 | return needs_downconvert; | |
611 | } | |
612 | ||
613 | static void ocfs2_generic_bast_func(struct ocfs2_super *osb, | |
614 | struct ocfs2_lock_res *lockres, | |
615 | int level) | |
616 | { | |
617 | int needs_downconvert; | |
618 | unsigned long flags; | |
619 | ||
620 | mlog_entry_void(); | |
621 | ||
622 | BUG_ON(level <= LKM_NLMODE); | |
623 | ||
624 | spin_lock_irqsave(&lockres->l_lock, flags); | |
625 | needs_downconvert = ocfs2_generic_handle_bast(lockres, level); | |
626 | if (needs_downconvert) | |
627 | ocfs2_schedule_blocked_lock(osb, lockres); | |
628 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
629 | ||
630 | ocfs2_kick_vote_thread(osb); | |
631 | ||
632 | wake_up(&lockres->l_event); | |
633 | mlog_exit_void(); | |
634 | } | |
635 | ||
636 | static void ocfs2_inode_bast_func(void *opaque, int level) | |
637 | { | |
638 | struct ocfs2_lock_res *lockres = opaque; | |
639 | struct inode *inode; | |
640 | struct ocfs2_super *osb; | |
641 | ||
642 | mlog_entry_void(); | |
643 | ||
644 | BUG_ON(!ocfs2_is_inode_lock(lockres)); | |
645 | ||
646 | inode = ocfs2_lock_res_inode(lockres); | |
647 | osb = OCFS2_SB(inode->i_sb); | |
648 | ||
649 | mlog(0, "BAST fired for inode %"MLFu64", blocking = %d, level = %d " | |
650 | "type = %s\n", OCFS2_I(inode)->ip_blkno, level, | |
651 | lockres->l_level, | |
652 | ocfs2_lock_type_string(lockres->l_type)); | |
653 | ||
654 | ocfs2_generic_bast_func(osb, lockres, level); | |
655 | ||
656 | mlog_exit_void(); | |
657 | } | |
658 | ||
659 | static void ocfs2_generic_ast_func(struct ocfs2_lock_res *lockres, | |
660 | int ignore_refresh) | |
661 | { | |
662 | struct dlm_lockstatus *lksb = &lockres->l_lksb; | |
663 | unsigned long flags; | |
664 | ||
665 | spin_lock_irqsave(&lockres->l_lock, flags); | |
666 | ||
667 | if (lksb->status != DLM_NORMAL) { | |
668 | mlog(ML_ERROR, "lockres %s: lksb status value of %u!\n", | |
669 | lockres->l_name, lksb->status); | |
670 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
671 | return; | |
672 | } | |
673 | ||
674 | switch(lockres->l_action) { | |
675 | case OCFS2_AST_ATTACH: | |
676 | ocfs2_generic_handle_attach_action(lockres); | |
677 | break; | |
678 | case OCFS2_AST_CONVERT: | |
679 | ocfs2_generic_handle_convert_action(lockres); | |
680 | break; | |
681 | case OCFS2_AST_DOWNCONVERT: | |
682 | ocfs2_generic_handle_downconvert_action(lockres); | |
683 | break; | |
684 | default: | |
685 | BUG(); | |
686 | } | |
687 | ||
688 | if (ignore_refresh) | |
689 | lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); | |
690 | ||
691 | /* set it to something invalid so if we get called again we | |
692 | * can catch it. */ | |
693 | lockres->l_action = OCFS2_AST_INVALID; | |
694 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
695 | ||
696 | wake_up(&lockres->l_event); | |
697 | } | |
698 | ||
699 | static void ocfs2_super_ast_func(void *opaque) | |
700 | { | |
701 | struct ocfs2_lock_res *lockres = opaque; | |
702 | ||
703 | mlog_entry_void(); | |
704 | mlog(0, "Superblock AST fired\n"); | |
705 | ||
706 | BUG_ON(!ocfs2_is_super_lock(lockres)); | |
707 | ocfs2_generic_ast_func(lockres, 0); | |
708 | ||
709 | mlog_exit_void(); | |
710 | } | |
711 | ||
712 | static void ocfs2_super_bast_func(void *opaque, | |
713 | int level) | |
714 | { | |
715 | struct ocfs2_lock_res *lockres = opaque; | |
716 | struct ocfs2_super *osb; | |
717 | ||
718 | mlog_entry_void(); | |
719 | mlog(0, "Superblock BAST fired\n"); | |
720 | ||
721 | BUG_ON(!ocfs2_is_super_lock(lockres)); | |
722 | osb = ocfs2_lock_res_super(lockres); | |
723 | ocfs2_generic_bast_func(osb, lockres, level); | |
724 | ||
725 | mlog_exit_void(); | |
726 | } | |
727 | ||
728 | static void ocfs2_rename_ast_func(void *opaque) | |
729 | { | |
730 | struct ocfs2_lock_res *lockres = opaque; | |
731 | ||
732 | mlog_entry_void(); | |
733 | ||
734 | mlog(0, "Rename AST fired\n"); | |
735 | ||
736 | BUG_ON(!ocfs2_is_rename_lock(lockres)); | |
737 | ||
738 | ocfs2_generic_ast_func(lockres, 1); | |
739 | ||
740 | mlog_exit_void(); | |
741 | } | |
742 | ||
743 | static void ocfs2_rename_bast_func(void *opaque, | |
744 | int level) | |
745 | { | |
746 | struct ocfs2_lock_res *lockres = opaque; | |
747 | struct ocfs2_super *osb; | |
748 | ||
749 | mlog_entry_void(); | |
750 | ||
751 | mlog(0, "Rename BAST fired\n"); | |
752 | ||
753 | BUG_ON(!ocfs2_is_rename_lock(lockres)); | |
754 | ||
755 | osb = ocfs2_lock_res_super(lockres); | |
756 | ocfs2_generic_bast_func(osb, lockres, level); | |
757 | ||
758 | mlog_exit_void(); | |
759 | } | |
760 | ||
761 | static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, | |
762 | int convert) | |
763 | { | |
764 | unsigned long flags; | |
765 | ||
766 | mlog_entry_void(); | |
767 | spin_lock_irqsave(&lockres->l_lock, flags); | |
768 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
769 | if (convert) | |
770 | lockres->l_action = OCFS2_AST_INVALID; | |
771 | else | |
772 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
773 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
774 | ||
775 | wake_up(&lockres->l_event); | |
776 | mlog_exit_void(); | |
777 | } | |
778 | ||
779 | /* Note: If we detect another process working on the lock (i.e., | |
780 | * OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller | |
781 | * to do the right thing in that case. | |
782 | */ | |
783 | static int ocfs2_lock_create(struct ocfs2_super *osb, | |
784 | struct ocfs2_lock_res *lockres, | |
785 | int level, | |
786 | int dlm_flags) | |
787 | { | |
788 | int ret = 0; | |
789 | enum dlm_status status; | |
790 | unsigned long flags; | |
791 | ||
792 | mlog_entry_void(); | |
793 | ||
794 | mlog(0, "lock %s, level = %d, flags = %d\n", lockres->l_name, level, | |
795 | dlm_flags); | |
796 | ||
797 | spin_lock_irqsave(&lockres->l_lock, flags); | |
798 | if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) || | |
799 | (lockres->l_flags & OCFS2_LOCK_BUSY)) { | |
800 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
801 | goto bail; | |
802 | } | |
803 | ||
804 | lockres->l_action = OCFS2_AST_ATTACH; | |
805 | lockres->l_requested = level; | |
806 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
807 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
808 | ||
809 | status = dlmlock(osb->dlm, | |
810 | level, | |
811 | &lockres->l_lksb, | |
812 | dlm_flags, | |
813 | lockres->l_name, | |
814 | lockres->l_ops->ast, | |
815 | lockres, | |
816 | lockres->l_ops->bast); | |
817 | if (status != DLM_NORMAL) { | |
818 | ocfs2_log_dlm_error("dlmlock", status, lockres); | |
819 | ret = -EINVAL; | |
820 | ocfs2_recover_from_dlm_error(lockres, 1); | |
821 | } | |
822 | ||
823 | mlog(0, "lock %s, successfull return from dlmlock\n", lockres->l_name); | |
824 | ||
825 | bail: | |
826 | mlog_exit(ret); | |
827 | return ret; | |
828 | } | |
829 | ||
830 | static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres, | |
831 | int flag) | |
832 | { | |
833 | unsigned long flags; | |
834 | int ret; | |
835 | ||
836 | spin_lock_irqsave(&lockres->l_lock, flags); | |
837 | ret = lockres->l_flags & flag; | |
838 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
839 | ||
840 | return ret; | |
841 | } | |
842 | ||
843 | static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres) | |
844 | ||
845 | { | |
846 | wait_event(lockres->l_event, | |
847 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY)); | |
848 | } | |
849 | ||
850 | static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres) | |
851 | ||
852 | { | |
853 | wait_event(lockres->l_event, | |
854 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING)); | |
855 | } | |
856 | ||
857 | /* predict what lock level we'll be dropping down to on behalf | |
858 | * of another node, and return true if the currently wanted | |
859 | * level will be compatible with it. */ | |
860 | static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, | |
861 | int wanted) | |
862 | { | |
863 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
864 | ||
865 | return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking); | |
866 | } | |
867 | ||
868 | static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw) | |
869 | { | |
870 | INIT_LIST_HEAD(&mw->mw_item); | |
871 | init_completion(&mw->mw_complete); | |
872 | } | |
873 | ||
874 | static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw) | |
875 | { | |
876 | wait_for_completion(&mw->mw_complete); | |
877 | /* Re-arm the completion in case we want to wait on it again */ | |
878 | INIT_COMPLETION(mw->mw_complete); | |
879 | return mw->mw_status; | |
880 | } | |
881 | ||
882 | static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres, | |
883 | struct ocfs2_mask_waiter *mw, | |
884 | unsigned long mask, | |
885 | unsigned long goal) | |
886 | { | |
887 | BUG_ON(!list_empty(&mw->mw_item)); | |
888 | ||
889 | assert_spin_locked(&lockres->l_lock); | |
890 | ||
891 | list_add_tail(&mw->mw_item, &lockres->l_mask_waiters); | |
892 | mw->mw_mask = mask; | |
893 | mw->mw_goal = goal; | |
894 | } | |
895 | ||
896 | /* returns 0 if the mw that was removed was already satisfied, -EBUSY | |
897 | * if the mask still hadn't reached its goal */ | |
898 | static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres, | |
899 | struct ocfs2_mask_waiter *mw) | |
900 | { | |
901 | unsigned long flags; | |
902 | int ret = 0; | |
903 | ||
904 | spin_lock_irqsave(&lockres->l_lock, flags); | |
905 | if (!list_empty(&mw->mw_item)) { | |
906 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) | |
907 | ret = -EBUSY; | |
908 | ||
909 | list_del_init(&mw->mw_item); | |
910 | init_completion(&mw->mw_complete); | |
911 | } | |
912 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
913 | ||
914 | return ret; | |
915 | ||
916 | } | |
917 | ||
918 | static int ocfs2_cluster_lock(struct ocfs2_super *osb, | |
919 | struct ocfs2_lock_res *lockres, | |
920 | int level, | |
921 | int lkm_flags, | |
922 | int arg_flags) | |
923 | { | |
924 | struct ocfs2_mask_waiter mw; | |
925 | enum dlm_status status; | |
926 | int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR); | |
927 | int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */ | |
928 | unsigned long flags; | |
929 | ||
930 | mlog_entry_void(); | |
931 | ||
932 | ocfs2_init_mask_waiter(&mw); | |
933 | ||
934 | again: | |
935 | wait = 0; | |
936 | ||
937 | if (catch_signals && signal_pending(current)) { | |
938 | ret = -ERESTARTSYS; | |
939 | goto out; | |
940 | } | |
941 | ||
942 | spin_lock_irqsave(&lockres->l_lock, flags); | |
943 | ||
944 | mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING, | |
945 | "Cluster lock called on freeing lockres %s! flags " | |
946 | "0x%lx\n", lockres->l_name, lockres->l_flags); | |
947 | ||
948 | /* We only compare against the currently granted level | |
949 | * here. If the lock is blocked waiting on a downconvert, | |
950 | * we'll get caught below. */ | |
951 | if (lockres->l_flags & OCFS2_LOCK_BUSY && | |
952 | level > lockres->l_level) { | |
953 | /* is someone sitting in dlm_lock? If so, wait on | |
954 | * them. */ | |
955 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
956 | wait = 1; | |
957 | goto unlock; | |
958 | } | |
959 | ||
960 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { | |
961 | /* lock has not been created yet. */ | |
962 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
963 | ||
964 | ret = ocfs2_lock_create(osb, lockres, LKM_NLMODE, 0); | |
965 | if (ret < 0) { | |
966 | mlog_errno(ret); | |
967 | goto out; | |
968 | } | |
969 | goto again; | |
970 | } | |
971 | ||
972 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED && | |
973 | !ocfs2_may_continue_on_blocked_lock(lockres, level)) { | |
974 | /* is the lock is currently blocked on behalf of | |
975 | * another node */ | |
976 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0); | |
977 | wait = 1; | |
978 | goto unlock; | |
979 | } | |
980 | ||
981 | if (level > lockres->l_level) { | |
982 | if (lockres->l_action != OCFS2_AST_INVALID) | |
983 | mlog(ML_ERROR, "lockres %s has action %u pending\n", | |
984 | lockres->l_name, lockres->l_action); | |
985 | ||
986 | lockres->l_action = OCFS2_AST_CONVERT; | |
987 | lockres->l_requested = level; | |
988 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
989 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
990 | ||
991 | BUG_ON(level == LKM_IVMODE); | |
992 | BUG_ON(level == LKM_NLMODE); | |
993 | ||
994 | mlog(0, "lock %s, convert from %d to level = %d\n", | |
995 | lockres->l_name, lockres->l_level, level); | |
996 | ||
997 | /* call dlm_lock to upgrade lock now */ | |
998 | status = dlmlock(osb->dlm, | |
999 | level, | |
1000 | &lockres->l_lksb, | |
1001 | lkm_flags|LKM_CONVERT|LKM_VALBLK, | |
1002 | lockres->l_name, | |
1003 | lockres->l_ops->ast, | |
1004 | lockres, | |
1005 | lockres->l_ops->bast); | |
1006 | if (status != DLM_NORMAL) { | |
1007 | if ((lkm_flags & LKM_NOQUEUE) && | |
1008 | (status == DLM_NOTQUEUED)) | |
1009 | ret = -EAGAIN; | |
1010 | else { | |
1011 | ocfs2_log_dlm_error("dlmlock", status, | |
1012 | lockres); | |
1013 | ret = -EINVAL; | |
1014 | } | |
1015 | ocfs2_recover_from_dlm_error(lockres, 1); | |
1016 | goto out; | |
1017 | } | |
1018 | ||
1019 | mlog(0, "lock %s, successfull return from dlmlock\n", | |
1020 | lockres->l_name); | |
1021 | ||
1022 | /* At this point we've gone inside the dlm and need to | |
1023 | * complete our work regardless. */ | |
1024 | catch_signals = 0; | |
1025 | ||
1026 | /* wait for busy to clear and carry on */ | |
1027 | goto again; | |
1028 | } | |
1029 | ||
1030 | /* Ok, if we get here then we're good to go. */ | |
1031 | ocfs2_inc_holders(lockres, level); | |
1032 | ||
1033 | ret = 0; | |
1034 | unlock: | |
1035 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1036 | out: | |
1037 | /* | |
1038 | * This is helping work around a lock inversion between the page lock | |
1039 | * and dlm locks. One path holds the page lock while calling aops | |
1040 | * which block acquiring dlm locks. The voting thread holds dlm | |
1041 | * locks while acquiring page locks while down converting data locks. | |
1042 | * This block is helping an aop path notice the inversion and back | |
1043 | * off to unlock its page lock before trying the dlm lock again. | |
1044 | */ | |
1045 | if (wait && arg_flags & OCFS2_LOCK_NONBLOCK && | |
1046 | mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) { | |
1047 | wait = 0; | |
1048 | if (lockres_remove_mask_waiter(lockres, &mw)) | |
1049 | ret = -EAGAIN; | |
1050 | else | |
1051 | goto again; | |
1052 | } | |
1053 | if (wait) { | |
1054 | ret = ocfs2_wait_for_mask(&mw); | |
1055 | if (ret == 0) | |
1056 | goto again; | |
1057 | mlog_errno(ret); | |
1058 | } | |
1059 | ||
1060 | mlog_exit(ret); | |
1061 | return ret; | |
1062 | } | |
1063 | ||
1064 | static void ocfs2_cluster_unlock(struct ocfs2_super *osb, | |
1065 | struct ocfs2_lock_res *lockres, | |
1066 | int level) | |
1067 | { | |
1068 | unsigned long flags; | |
1069 | ||
1070 | mlog_entry_void(); | |
1071 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1072 | ocfs2_dec_holders(lockres, level); | |
1073 | ocfs2_vote_on_unlock(osb, lockres); | |
1074 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1075 | mlog_exit_void(); | |
1076 | } | |
1077 | ||
1078 | static int ocfs2_create_new_inode_lock(struct inode *inode, | |
1079 | struct ocfs2_lock_res *lockres) | |
1080 | { | |
1081 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1082 | unsigned long flags; | |
1083 | ||
1084 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1085 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); | |
1086 | lockres_or_flags(lockres, OCFS2_LOCK_LOCAL); | |
1087 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1088 | ||
1089 | return ocfs2_lock_create(osb, lockres, LKM_EXMODE, LKM_LOCAL); | |
1090 | } | |
1091 | ||
1092 | /* Grants us an EX lock on the data and metadata resources, skipping | |
1093 | * the normal cluster directory lookup. Use this ONLY on newly created | |
1094 | * inodes which other nodes can't possibly see, and which haven't been | |
1095 | * hashed in the inode hash yet. This can give us a good performance | |
1096 | * increase as it'll skip the network broadcast normally associated | |
1097 | * with creating a new lock resource. */ | |
1098 | int ocfs2_create_new_inode_locks(struct inode *inode) | |
1099 | { | |
1100 | int ret; | |
1101 | ||
1102 | BUG_ON(!inode); | |
1103 | BUG_ON(!ocfs2_inode_is_new(inode)); | |
1104 | ||
1105 | mlog_entry_void(); | |
1106 | ||
1107 | mlog(0, "Inode %"MLFu64"\n", OCFS2_I(inode)->ip_blkno); | |
1108 | ||
1109 | /* NOTE: That we don't increment any of the holder counts, nor | |
1110 | * do we add anything to a journal handle. Since this is | |
1111 | * supposed to be a new inode which the cluster doesn't know | |
1112 | * about yet, there is no need to. As far as the LVB handling | |
1113 | * is concerned, this is basically like acquiring an EX lock | |
1114 | * on a resource which has an invalid one -- we'll set it | |
1115 | * valid when we release the EX. */ | |
1116 | ||
1117 | ret = ocfs2_create_new_inode_lock(inode, | |
1118 | &OCFS2_I(inode)->ip_rw_lockres); | |
1119 | if (ret) { | |
1120 | mlog_errno(ret); | |
1121 | goto bail; | |
1122 | } | |
1123 | ||
1124 | ret = ocfs2_create_new_inode_lock(inode, | |
1125 | &OCFS2_I(inode)->ip_meta_lockres); | |
1126 | if (ret) { | |
1127 | mlog_errno(ret); | |
1128 | goto bail; | |
1129 | } | |
1130 | ||
1131 | ret = ocfs2_create_new_inode_lock(inode, | |
1132 | &OCFS2_I(inode)->ip_data_lockres); | |
1133 | if (ret) { | |
1134 | mlog_errno(ret); | |
1135 | goto bail; | |
1136 | } | |
1137 | ||
1138 | bail: | |
1139 | mlog_exit(ret); | |
1140 | return ret; | |
1141 | } | |
1142 | ||
1143 | int ocfs2_rw_lock(struct inode *inode, int write) | |
1144 | { | |
1145 | int status, level; | |
1146 | struct ocfs2_lock_res *lockres; | |
1147 | ||
1148 | BUG_ON(!inode); | |
1149 | ||
1150 | mlog_entry_void(); | |
1151 | ||
1152 | mlog(0, "inode %"MLFu64" take %s RW lock\n", | |
1153 | OCFS2_I(inode)->ip_blkno, | |
1154 | write ? "EXMODE" : "PRMODE"); | |
1155 | ||
1156 | lockres = &OCFS2_I(inode)->ip_rw_lockres; | |
1157 | ||
1158 | level = write ? LKM_EXMODE : LKM_PRMODE; | |
1159 | ||
1160 | status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, 0, | |
1161 | 0); | |
1162 | if (status < 0) | |
1163 | mlog_errno(status); | |
1164 | ||
1165 | mlog_exit(status); | |
1166 | return status; | |
1167 | } | |
1168 | ||
1169 | void ocfs2_rw_unlock(struct inode *inode, int write) | |
1170 | { | |
1171 | int level = write ? LKM_EXMODE : LKM_PRMODE; | |
1172 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres; | |
1173 | ||
1174 | mlog_entry_void(); | |
1175 | ||
1176 | mlog(0, "inode %"MLFu64" drop %s RW lock\n", | |
1177 | OCFS2_I(inode)->ip_blkno, | |
1178 | write ? "EXMODE" : "PRMODE"); | |
1179 | ||
1180 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); | |
1181 | ||
1182 | mlog_exit_void(); | |
1183 | } | |
1184 | ||
1185 | int ocfs2_data_lock_full(struct inode *inode, | |
1186 | int write, | |
1187 | int arg_flags) | |
1188 | { | |
1189 | int status = 0, level; | |
1190 | struct ocfs2_lock_res *lockres; | |
1191 | ||
1192 | BUG_ON(!inode); | |
1193 | ||
1194 | mlog_entry_void(); | |
1195 | ||
1196 | mlog(0, "inode %"MLFu64" take %s DATA lock\n", | |
1197 | OCFS2_I(inode)->ip_blkno, | |
1198 | write ? "EXMODE" : "PRMODE"); | |
1199 | ||
1200 | /* We'll allow faking a readonly data lock for | |
1201 | * rodevices. */ | |
1202 | if (ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) { | |
1203 | if (write) { | |
1204 | status = -EROFS; | |
1205 | mlog_errno(status); | |
1206 | } | |
1207 | goto out; | |
1208 | } | |
1209 | ||
1210 | lockres = &OCFS2_I(inode)->ip_data_lockres; | |
1211 | ||
1212 | level = write ? LKM_EXMODE : LKM_PRMODE; | |
1213 | ||
1214 | status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, | |
1215 | 0, arg_flags); | |
1216 | if (status < 0 && status != -EAGAIN) | |
1217 | mlog_errno(status); | |
1218 | ||
1219 | out: | |
1220 | mlog_exit(status); | |
1221 | return status; | |
1222 | } | |
1223 | ||
1224 | /* see ocfs2_meta_lock_with_page() */ | |
1225 | int ocfs2_data_lock_with_page(struct inode *inode, | |
1226 | int write, | |
1227 | struct page *page) | |
1228 | { | |
1229 | int ret; | |
1230 | ||
1231 | ret = ocfs2_data_lock_full(inode, write, OCFS2_LOCK_NONBLOCK); | |
1232 | if (ret == -EAGAIN) { | |
1233 | unlock_page(page); | |
1234 | if (ocfs2_data_lock(inode, write) == 0) | |
1235 | ocfs2_data_unlock(inode, write); | |
1236 | ret = AOP_TRUNCATED_PAGE; | |
1237 | } | |
1238 | ||
1239 | return ret; | |
1240 | } | |
1241 | ||
1242 | static void ocfs2_vote_on_unlock(struct ocfs2_super *osb, | |
1243 | struct ocfs2_lock_res *lockres) | |
1244 | { | |
1245 | int kick = 0; | |
1246 | ||
1247 | mlog_entry_void(); | |
1248 | ||
1249 | /* If we know that another node is waiting on our lock, kick | |
1250 | * the vote thread * pre-emptively when we reach a release | |
1251 | * condition. */ | |
1252 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) { | |
1253 | switch(lockres->l_blocking) { | |
1254 | case LKM_EXMODE: | |
1255 | if (!lockres->l_ex_holders && !lockres->l_ro_holders) | |
1256 | kick = 1; | |
1257 | break; | |
1258 | case LKM_PRMODE: | |
1259 | if (!lockres->l_ex_holders) | |
1260 | kick = 1; | |
1261 | break; | |
1262 | default: | |
1263 | BUG(); | |
1264 | } | |
1265 | } | |
1266 | ||
1267 | if (kick) | |
1268 | ocfs2_kick_vote_thread(osb); | |
1269 | ||
1270 | mlog_exit_void(); | |
1271 | } | |
1272 | ||
1273 | void ocfs2_data_unlock(struct inode *inode, | |
1274 | int write) | |
1275 | { | |
1276 | int level = write ? LKM_EXMODE : LKM_PRMODE; | |
1277 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_data_lockres; | |
1278 | ||
1279 | mlog_entry_void(); | |
1280 | ||
1281 | mlog(0, "inode %"MLFu64" drop %s DATA lock\n", | |
1282 | OCFS2_I(inode)->ip_blkno, | |
1283 | write ? "EXMODE" : "PRMODE"); | |
1284 | ||
1285 | if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) | |
1286 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); | |
1287 | ||
1288 | mlog_exit_void(); | |
1289 | } | |
1290 | ||
1291 | #define OCFS2_SEC_BITS 34 | |
1292 | #define OCFS2_SEC_SHIFT (64 - 34) | |
1293 | #define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1) | |
1294 | ||
1295 | /* LVB only has room for 64 bits of time here so we pack it for | |
1296 | * now. */ | |
1297 | static u64 ocfs2_pack_timespec(struct timespec *spec) | |
1298 | { | |
1299 | u64 res; | |
1300 | u64 sec = spec->tv_sec; | |
1301 | u32 nsec = spec->tv_nsec; | |
1302 | ||
1303 | res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK); | |
1304 | ||
1305 | return res; | |
1306 | } | |
1307 | ||
1308 | /* Call this with the lockres locked. I am reasonably sure we don't | |
1309 | * need ip_lock in this function as anyone who would be changing those | |
1310 | * values is supposed to be blocked in ocfs2_meta_lock right now. */ | |
1311 | static void __ocfs2_stuff_meta_lvb(struct inode *inode) | |
1312 | { | |
1313 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
1314 | struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres; | |
1315 | struct ocfs2_meta_lvb *lvb; | |
1316 | ||
1317 | mlog_entry_void(); | |
1318 | ||
1319 | lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; | |
1320 | ||
1321 | lvb->lvb_version = cpu_to_be32(OCFS2_LVB_VERSION); | |
1322 | lvb->lvb_isize = cpu_to_be64(i_size_read(inode)); | |
1323 | lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters); | |
1324 | lvb->lvb_iuid = cpu_to_be32(inode->i_uid); | |
1325 | lvb->lvb_igid = cpu_to_be32(inode->i_gid); | |
1326 | lvb->lvb_imode = cpu_to_be16(inode->i_mode); | |
1327 | lvb->lvb_inlink = cpu_to_be16(inode->i_nlink); | |
1328 | lvb->lvb_iatime_packed = | |
1329 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime)); | |
1330 | lvb->lvb_ictime_packed = | |
1331 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime)); | |
1332 | lvb->lvb_imtime_packed = | |
1333 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime)); | |
1334 | ||
1335 | mlog_meta_lvb(0, lockres); | |
1336 | ||
1337 | mlog_exit_void(); | |
1338 | } | |
1339 | ||
1340 | static void ocfs2_unpack_timespec(struct timespec *spec, | |
1341 | u64 packed_time) | |
1342 | { | |
1343 | spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT; | |
1344 | spec->tv_nsec = packed_time & OCFS2_NSEC_MASK; | |
1345 | } | |
1346 | ||
1347 | static void ocfs2_refresh_inode_from_lvb(struct inode *inode) | |
1348 | { | |
1349 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
1350 | struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres; | |
1351 | struct ocfs2_meta_lvb *lvb; | |
1352 | ||
1353 | mlog_entry_void(); | |
1354 | ||
1355 | mlog_meta_lvb(0, lockres); | |
1356 | ||
1357 | lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; | |
1358 | ||
1359 | /* We're safe here without the lockres lock... */ | |
1360 | spin_lock(&oi->ip_lock); | |
1361 | oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters); | |
1362 | i_size_write(inode, be64_to_cpu(lvb->lvb_isize)); | |
1363 | ||
1364 | /* fast-symlinks are a special case */ | |
1365 | if (S_ISLNK(inode->i_mode) && !oi->ip_clusters) | |
1366 | inode->i_blocks = 0; | |
1367 | else | |
1368 | inode->i_blocks = | |
1369 | ocfs2_align_bytes_to_sectors(i_size_read(inode)); | |
1370 | ||
1371 | inode->i_uid = be32_to_cpu(lvb->lvb_iuid); | |
1372 | inode->i_gid = be32_to_cpu(lvb->lvb_igid); | |
1373 | inode->i_mode = be16_to_cpu(lvb->lvb_imode); | |
1374 | inode->i_nlink = be16_to_cpu(lvb->lvb_inlink); | |
1375 | ocfs2_unpack_timespec(&inode->i_atime, | |
1376 | be64_to_cpu(lvb->lvb_iatime_packed)); | |
1377 | ocfs2_unpack_timespec(&inode->i_mtime, | |
1378 | be64_to_cpu(lvb->lvb_imtime_packed)); | |
1379 | ocfs2_unpack_timespec(&inode->i_ctime, | |
1380 | be64_to_cpu(lvb->lvb_ictime_packed)); | |
1381 | spin_unlock(&oi->ip_lock); | |
1382 | ||
1383 | mlog_exit_void(); | |
1384 | } | |
1385 | ||
1386 | static inline int ocfs2_meta_lvb_is_trustable(struct ocfs2_lock_res *lockres) | |
1387 | { | |
1388 | struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; | |
1389 | ||
1390 | if (be32_to_cpu(lvb->lvb_version) == OCFS2_LVB_VERSION) | |
1391 | return 1; | |
1392 | return 0; | |
1393 | } | |
1394 | ||
1395 | /* Determine whether a lock resource needs to be refreshed, and | |
1396 | * arbitrate who gets to refresh it. | |
1397 | * | |
1398 | * 0 means no refresh needed. | |
1399 | * | |
1400 | * > 0 means you need to refresh this and you MUST call | |
1401 | * ocfs2_complete_lock_res_refresh afterwards. */ | |
1402 | static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres) | |
1403 | { | |
1404 | unsigned long flags; | |
1405 | int status = 0; | |
1406 | ||
1407 | mlog_entry_void(); | |
1408 | ||
1409 | refresh_check: | |
1410 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1411 | if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) { | |
1412 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1413 | goto bail; | |
1414 | } | |
1415 | ||
1416 | if (lockres->l_flags & OCFS2_LOCK_REFRESHING) { | |
1417 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1418 | ||
1419 | ocfs2_wait_on_refreshing_lock(lockres); | |
1420 | goto refresh_check; | |
1421 | } | |
1422 | ||
1423 | /* Ok, I'll be the one to refresh this lock. */ | |
1424 | lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING); | |
1425 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1426 | ||
1427 | status = 1; | |
1428 | bail: | |
1429 | mlog_exit(status); | |
1430 | return status; | |
1431 | } | |
1432 | ||
1433 | /* If status is non zero, I'll mark it as not being in refresh | |
1434 | * anymroe, but i won't clear the needs refresh flag. */ | |
1435 | static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres, | |
1436 | int status) | |
1437 | { | |
1438 | unsigned long flags; | |
1439 | mlog_entry_void(); | |
1440 | ||
1441 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1442 | lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING); | |
1443 | if (!status) | |
1444 | lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); | |
1445 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1446 | ||
1447 | wake_up(&lockres->l_event); | |
1448 | ||
1449 | mlog_exit_void(); | |
1450 | } | |
1451 | ||
1452 | /* may or may not return a bh if it went to disk. */ | |
1453 | static int ocfs2_meta_lock_update(struct inode *inode, | |
1454 | struct buffer_head **bh) | |
1455 | { | |
1456 | int status = 0; | |
1457 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
1458 | struct ocfs2_lock_res *lockres; | |
1459 | struct ocfs2_dinode *fe; | |
1460 | ||
1461 | mlog_entry_void(); | |
1462 | ||
1463 | spin_lock(&oi->ip_lock); | |
1464 | if (oi->ip_flags & OCFS2_INODE_DELETED) { | |
1465 | mlog(0, "Orphaned inode %"MLFu64" was deleted while we " | |
1466 | "were waiting on a lock. ip_flags = 0x%x\n", | |
1467 | oi->ip_blkno, oi->ip_flags); | |
1468 | spin_unlock(&oi->ip_lock); | |
1469 | status = -ENOENT; | |
1470 | goto bail; | |
1471 | } | |
1472 | spin_unlock(&oi->ip_lock); | |
1473 | ||
1474 | lockres = &oi->ip_meta_lockres; | |
1475 | ||
1476 | if (!ocfs2_should_refresh_lock_res(lockres)) | |
1477 | goto bail; | |
1478 | ||
1479 | /* This will discard any caching information we might have had | |
1480 | * for the inode metadata. */ | |
1481 | ocfs2_metadata_cache_purge(inode); | |
1482 | ||
1483 | /* will do nothing for inode types that don't use the extent | |
1484 | * map (directories, bitmap files, etc) */ | |
1485 | ocfs2_extent_map_trunc(inode, 0); | |
1486 | ||
1487 | if (ocfs2_meta_lvb_is_trustable(lockres)) { | |
1488 | mlog(0, "Trusting LVB on inode %"MLFu64"\n", | |
1489 | oi->ip_blkno); | |
1490 | ocfs2_refresh_inode_from_lvb(inode); | |
1491 | } else { | |
1492 | /* Boo, we have to go to disk. */ | |
1493 | /* read bh, cast, ocfs2_refresh_inode */ | |
1494 | status = ocfs2_read_block(OCFS2_SB(inode->i_sb), oi->ip_blkno, | |
1495 | bh, OCFS2_BH_CACHED, inode); | |
1496 | if (status < 0) { | |
1497 | mlog_errno(status); | |
1498 | goto bail_refresh; | |
1499 | } | |
1500 | fe = (struct ocfs2_dinode *) (*bh)->b_data; | |
1501 | ||
1502 | /* This is a good chance to make sure we're not | |
1503 | * locking an invalid object. | |
1504 | * | |
1505 | * We bug on a stale inode here because we checked | |
1506 | * above whether it was wiped from disk. The wiping | |
1507 | * node provides a guarantee that we receive that | |
1508 | * message and can mark the inode before dropping any | |
1509 | * locks associated with it. */ | |
1510 | if (!OCFS2_IS_VALID_DINODE(fe)) { | |
1511 | OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); | |
1512 | status = -EIO; | |
1513 | goto bail_refresh; | |
1514 | } | |
1515 | mlog_bug_on_msg(inode->i_generation != | |
1516 | le32_to_cpu(fe->i_generation), | |
1517 | "Invalid dinode %"MLFu64" disk generation: %u " | |
1518 | "inode->i_generation: %u\n", | |
1519 | oi->ip_blkno, le32_to_cpu(fe->i_generation), | |
1520 | inode->i_generation); | |
1521 | mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) || | |
1522 | !(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)), | |
1523 | "Stale dinode %"MLFu64" dtime: %"MLFu64" " | |
1524 | "flags: 0x%x\n", oi->ip_blkno, | |
1525 | le64_to_cpu(fe->i_dtime), | |
1526 | le32_to_cpu(fe->i_flags)); | |
1527 | ||
1528 | ocfs2_refresh_inode(inode, fe); | |
1529 | } | |
1530 | ||
1531 | status = 0; | |
1532 | bail_refresh: | |
1533 | ocfs2_complete_lock_res_refresh(lockres, status); | |
1534 | bail: | |
1535 | mlog_exit(status); | |
1536 | return status; | |
1537 | } | |
1538 | ||
1539 | static int ocfs2_assign_bh(struct inode *inode, | |
1540 | struct buffer_head **ret_bh, | |
1541 | struct buffer_head *passed_bh) | |
1542 | { | |
1543 | int status; | |
1544 | ||
1545 | if (passed_bh) { | |
1546 | /* Ok, the update went to disk for us, use the | |
1547 | * returned bh. */ | |
1548 | *ret_bh = passed_bh; | |
1549 | get_bh(*ret_bh); | |
1550 | ||
1551 | return 0; | |
1552 | } | |
1553 | ||
1554 | status = ocfs2_read_block(OCFS2_SB(inode->i_sb), | |
1555 | OCFS2_I(inode)->ip_blkno, | |
1556 | ret_bh, | |
1557 | OCFS2_BH_CACHED, | |
1558 | inode); | |
1559 | if (status < 0) | |
1560 | mlog_errno(status); | |
1561 | ||
1562 | return status; | |
1563 | } | |
1564 | ||
1565 | /* | |
1566 | * returns < 0 error if the callback will never be called, otherwise | |
1567 | * the result of the lock will be communicated via the callback. | |
1568 | */ | |
1569 | int ocfs2_meta_lock_full(struct inode *inode, | |
1570 | struct ocfs2_journal_handle *handle, | |
1571 | struct buffer_head **ret_bh, | |
1572 | int ex, | |
1573 | int arg_flags) | |
1574 | { | |
1575 | int status, level, dlm_flags, acquired; | |
1576 | struct ocfs2_lock_res *lockres; | |
1577 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1578 | struct buffer_head *local_bh = NULL; | |
1579 | ||
1580 | BUG_ON(!inode); | |
1581 | ||
1582 | mlog_entry_void(); | |
1583 | ||
1584 | mlog(0, "inode %"MLFu64", take %s META lock\n", | |
1585 | OCFS2_I(inode)->ip_blkno, | |
1586 | ex ? "EXMODE" : "PRMODE"); | |
1587 | ||
1588 | status = 0; | |
1589 | acquired = 0; | |
1590 | /* We'll allow faking a readonly metadata lock for | |
1591 | * rodevices. */ | |
1592 | if (ocfs2_is_hard_readonly(osb)) { | |
1593 | if (ex) | |
1594 | status = -EROFS; | |
1595 | goto bail; | |
1596 | } | |
1597 | ||
1598 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) | |
1599 | wait_event(osb->recovery_event, | |
1600 | ocfs2_node_map_is_empty(osb, &osb->recovery_map)); | |
1601 | ||
1602 | acquired = 0; | |
1603 | lockres = &OCFS2_I(inode)->ip_meta_lockres; | |
1604 | level = ex ? LKM_EXMODE : LKM_PRMODE; | |
1605 | dlm_flags = 0; | |
1606 | if (arg_flags & OCFS2_META_LOCK_NOQUEUE) | |
1607 | dlm_flags |= LKM_NOQUEUE; | |
1608 | ||
1609 | status = ocfs2_cluster_lock(osb, lockres, level, dlm_flags, arg_flags); | |
1610 | if (status < 0) { | |
1611 | if (status != -EAGAIN && status != -EIOCBRETRY) | |
1612 | mlog_errno(status); | |
1613 | goto bail; | |
1614 | } | |
1615 | ||
1616 | /* Notify the error cleanup path to drop the cluster lock. */ | |
1617 | acquired = 1; | |
1618 | ||
1619 | /* We wait twice because a node may have died while we were in | |
1620 | * the lower dlm layers. The second time though, we've | |
1621 | * committed to owning this lock so we don't allow signals to | |
1622 | * abort the operation. */ | |
1623 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) | |
1624 | wait_event(osb->recovery_event, | |
1625 | ocfs2_node_map_is_empty(osb, &osb->recovery_map)); | |
1626 | ||
1627 | /* This is fun. The caller may want a bh back, or it may | |
1628 | * not. ocfs2_meta_lock_update definitely wants one in, but | |
1629 | * may or may not read one, depending on what's in the | |
1630 | * LVB. The result of all of this is that we've *only* gone to | |
1631 | * disk if we have to, so the complexity is worthwhile. */ | |
1632 | status = ocfs2_meta_lock_update(inode, &local_bh); | |
1633 | if (status < 0) { | |
1634 | if (status != -ENOENT) | |
1635 | mlog_errno(status); | |
1636 | goto bail; | |
1637 | } | |
1638 | ||
1639 | if (ret_bh) { | |
1640 | status = ocfs2_assign_bh(inode, ret_bh, local_bh); | |
1641 | if (status < 0) { | |
1642 | mlog_errno(status); | |
1643 | goto bail; | |
1644 | } | |
1645 | } | |
1646 | ||
1647 | if (handle) { | |
1648 | status = ocfs2_handle_add_lock(handle, inode); | |
1649 | if (status < 0) | |
1650 | mlog_errno(status); | |
1651 | } | |
1652 | ||
1653 | bail: | |
1654 | if (status < 0) { | |
1655 | if (ret_bh && (*ret_bh)) { | |
1656 | brelse(*ret_bh); | |
1657 | *ret_bh = NULL; | |
1658 | } | |
1659 | if (acquired) | |
1660 | ocfs2_meta_unlock(inode, ex); | |
1661 | } | |
1662 | ||
1663 | if (local_bh) | |
1664 | brelse(local_bh); | |
1665 | ||
1666 | mlog_exit(status); | |
1667 | return status; | |
1668 | } | |
1669 | ||
1670 | /* | |
1671 | * This is working around a lock inversion between tasks acquiring DLM locks | |
1672 | * while holding a page lock and the vote thread which blocks dlm lock acquiry | |
1673 | * while acquiring page locks. | |
1674 | * | |
1675 | * ** These _with_page variantes are only intended to be called from aop | |
1676 | * methods that hold page locks and return a very specific *positive* error | |
1677 | * code that aop methods pass up to the VFS -- test for errors with != 0. ** | |
1678 | * | |
1679 | * The DLM is called such that it returns -EAGAIN if it would have blocked | |
1680 | * waiting for the vote thread. In that case we unlock our page so the vote | |
1681 | * thread can make progress. Once we've done this we have to return | |
1682 | * AOP_TRUNCATED_PAGE so the aop method that called us can bubble that back up | |
1683 | * into the VFS who will then immediately retry the aop call. | |
1684 | * | |
1685 | * We do a blocking lock and immediate unlock before returning, though, so that | |
1686 | * the lock has a great chance of being cached on this node by the time the VFS | |
1687 | * calls back to retry the aop. This has a potential to livelock as nodes | |
1688 | * ping locks back and forth, but that's a risk we're willing to take to avoid | |
1689 | * the lock inversion simply. | |
1690 | */ | |
1691 | int ocfs2_meta_lock_with_page(struct inode *inode, | |
1692 | struct ocfs2_journal_handle *handle, | |
1693 | struct buffer_head **ret_bh, | |
1694 | int ex, | |
1695 | struct page *page) | |
1696 | { | |
1697 | int ret; | |
1698 | ||
1699 | ret = ocfs2_meta_lock_full(inode, handle, ret_bh, ex, | |
1700 | OCFS2_LOCK_NONBLOCK); | |
1701 | if (ret == -EAGAIN) { | |
1702 | unlock_page(page); | |
1703 | if (ocfs2_meta_lock(inode, handle, ret_bh, ex) == 0) | |
1704 | ocfs2_meta_unlock(inode, ex); | |
1705 | ret = AOP_TRUNCATED_PAGE; | |
1706 | } | |
1707 | ||
1708 | return ret; | |
1709 | } | |
1710 | ||
1711 | void ocfs2_meta_unlock(struct inode *inode, | |
1712 | int ex) | |
1713 | { | |
1714 | int level = ex ? LKM_EXMODE : LKM_PRMODE; | |
1715 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres; | |
1716 | ||
1717 | mlog_entry_void(); | |
1718 | ||
1719 | mlog(0, "inode %"MLFu64" drop %s META lock\n", | |
1720 | OCFS2_I(inode)->ip_blkno, | |
1721 | ex ? "EXMODE" : "PRMODE"); | |
1722 | ||
1723 | if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) | |
1724 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); | |
1725 | ||
1726 | mlog_exit_void(); | |
1727 | } | |
1728 | ||
1729 | int ocfs2_super_lock(struct ocfs2_super *osb, | |
1730 | int ex) | |
1731 | { | |
1732 | int status; | |
1733 | int level = ex ? LKM_EXMODE : LKM_PRMODE; | |
1734 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; | |
1735 | struct buffer_head *bh; | |
1736 | struct ocfs2_slot_info *si = osb->slot_info; | |
1737 | ||
1738 | mlog_entry_void(); | |
1739 | ||
1740 | if (ocfs2_is_hard_readonly(osb)) | |
1741 | return -EROFS; | |
1742 | ||
1743 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); | |
1744 | if (status < 0) { | |
1745 | mlog_errno(status); | |
1746 | goto bail; | |
1747 | } | |
1748 | ||
1749 | /* The super block lock path is really in the best position to | |
1750 | * know when resources covered by the lock need to be | |
1751 | * refreshed, so we do it here. Of course, making sense of | |
1752 | * everything is up to the caller :) */ | |
1753 | status = ocfs2_should_refresh_lock_res(lockres); | |
1754 | if (status < 0) { | |
1755 | mlog_errno(status); | |
1756 | goto bail; | |
1757 | } | |
1758 | if (status) { | |
1759 | bh = si->si_bh; | |
1760 | status = ocfs2_read_block(osb, bh->b_blocknr, &bh, 0, | |
1761 | si->si_inode); | |
1762 | if (status == 0) | |
1763 | ocfs2_update_slot_info(si); | |
1764 | ||
1765 | ocfs2_complete_lock_res_refresh(lockres, status); | |
1766 | ||
1767 | if (status < 0) | |
1768 | mlog_errno(status); | |
1769 | } | |
1770 | bail: | |
1771 | mlog_exit(status); | |
1772 | return status; | |
1773 | } | |
1774 | ||
1775 | void ocfs2_super_unlock(struct ocfs2_super *osb, | |
1776 | int ex) | |
1777 | { | |
1778 | int level = ex ? LKM_EXMODE : LKM_PRMODE; | |
1779 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; | |
1780 | ||
1781 | ocfs2_cluster_unlock(osb, lockres, level); | |
1782 | } | |
1783 | ||
1784 | int ocfs2_rename_lock(struct ocfs2_super *osb) | |
1785 | { | |
1786 | int status; | |
1787 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; | |
1788 | ||
1789 | if (ocfs2_is_hard_readonly(osb)) | |
1790 | return -EROFS; | |
1791 | ||
1792 | status = ocfs2_cluster_lock(osb, lockres, LKM_EXMODE, 0, 0); | |
1793 | if (status < 0) | |
1794 | mlog_errno(status); | |
1795 | ||
1796 | return status; | |
1797 | } | |
1798 | ||
1799 | void ocfs2_rename_unlock(struct ocfs2_super *osb) | |
1800 | { | |
1801 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; | |
1802 | ||
1803 | ocfs2_cluster_unlock(osb, lockres, LKM_EXMODE); | |
1804 | } | |
1805 | ||
1806 | /* Reference counting of the dlm debug structure. We want this because | |
1807 | * open references on the debug inodes can live on after a mount, so | |
1808 | * we can't rely on the ocfs2_super to always exist. */ | |
1809 | static void ocfs2_dlm_debug_free(struct kref *kref) | |
1810 | { | |
1811 | struct ocfs2_dlm_debug *dlm_debug; | |
1812 | ||
1813 | dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt); | |
1814 | ||
1815 | kfree(dlm_debug); | |
1816 | } | |
1817 | ||
1818 | void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug) | |
1819 | { | |
1820 | if (dlm_debug) | |
1821 | kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free); | |
1822 | } | |
1823 | ||
1824 | static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug) | |
1825 | { | |
1826 | kref_get(&debug->d_refcnt); | |
1827 | } | |
1828 | ||
1829 | struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void) | |
1830 | { | |
1831 | struct ocfs2_dlm_debug *dlm_debug; | |
1832 | ||
1833 | dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL); | |
1834 | if (!dlm_debug) { | |
1835 | mlog_errno(-ENOMEM); | |
1836 | goto out; | |
1837 | } | |
1838 | ||
1839 | kref_init(&dlm_debug->d_refcnt); | |
1840 | INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking); | |
1841 | dlm_debug->d_locking_state = NULL; | |
1842 | out: | |
1843 | return dlm_debug; | |
1844 | } | |
1845 | ||
1846 | /* Access to this is arbitrated for us via seq_file->sem. */ | |
1847 | struct ocfs2_dlm_seq_priv { | |
1848 | struct ocfs2_dlm_debug *p_dlm_debug; | |
1849 | struct ocfs2_lock_res p_iter_res; | |
1850 | struct ocfs2_lock_res p_tmp_res; | |
1851 | }; | |
1852 | ||
1853 | static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start, | |
1854 | struct ocfs2_dlm_seq_priv *priv) | |
1855 | { | |
1856 | struct ocfs2_lock_res *iter, *ret = NULL; | |
1857 | struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug; | |
1858 | ||
1859 | assert_spin_locked(&ocfs2_dlm_tracking_lock); | |
1860 | ||
1861 | list_for_each_entry(iter, &start->l_debug_list, l_debug_list) { | |
1862 | /* discover the head of the list */ | |
1863 | if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) { | |
1864 | mlog(0, "End of list found, %p\n", ret); | |
1865 | break; | |
1866 | } | |
1867 | ||
1868 | /* We track our "dummy" iteration lockres' by a NULL | |
1869 | * l_ops field. */ | |
1870 | if (iter->l_ops != NULL) { | |
1871 | ret = iter; | |
1872 | break; | |
1873 | } | |
1874 | } | |
1875 | ||
1876 | return ret; | |
1877 | } | |
1878 | ||
1879 | static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos) | |
1880 | { | |
1881 | struct ocfs2_dlm_seq_priv *priv = m->private; | |
1882 | struct ocfs2_lock_res *iter; | |
1883 | ||
1884 | spin_lock(&ocfs2_dlm_tracking_lock); | |
1885 | iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv); | |
1886 | if (iter) { | |
1887 | /* Since lockres' have the lifetime of their container | |
1888 | * (which can be inodes, ocfs2_supers, etc) we want to | |
1889 | * copy this out to a temporary lockres while still | |
1890 | * under the spinlock. Obviously after this we can't | |
1891 | * trust any pointers on the copy returned, but that's | |
1892 | * ok as the information we want isn't typically held | |
1893 | * in them. */ | |
1894 | priv->p_tmp_res = *iter; | |
1895 | iter = &priv->p_tmp_res; | |
1896 | } | |
1897 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
1898 | ||
1899 | return iter; | |
1900 | } | |
1901 | ||
1902 | static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v) | |
1903 | { | |
1904 | } | |
1905 | ||
1906 | static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
1907 | { | |
1908 | struct ocfs2_dlm_seq_priv *priv = m->private; | |
1909 | struct ocfs2_lock_res *iter = v; | |
1910 | struct ocfs2_lock_res *dummy = &priv->p_iter_res; | |
1911 | ||
1912 | spin_lock(&ocfs2_dlm_tracking_lock); | |
1913 | iter = ocfs2_dlm_next_res(iter, priv); | |
1914 | list_del_init(&dummy->l_debug_list); | |
1915 | if (iter) { | |
1916 | list_add(&dummy->l_debug_list, &iter->l_debug_list); | |
1917 | priv->p_tmp_res = *iter; | |
1918 | iter = &priv->p_tmp_res; | |
1919 | } | |
1920 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
1921 | ||
1922 | return iter; | |
1923 | } | |
1924 | ||
1925 | /* So that debugfs.ocfs2 can determine which format is being used */ | |
1926 | #define OCFS2_DLM_DEBUG_STR_VERSION 1 | |
1927 | static int ocfs2_dlm_seq_show(struct seq_file *m, void *v) | |
1928 | { | |
1929 | int i; | |
1930 | char *lvb; | |
1931 | struct ocfs2_lock_res *lockres = v; | |
1932 | ||
1933 | if (!lockres) | |
1934 | return -EINVAL; | |
1935 | ||
1936 | seq_printf(m, "0x%x\t" | |
1937 | "%.*s\t" | |
1938 | "%d\t" | |
1939 | "0x%lx\t" | |
1940 | "0x%x\t" | |
1941 | "0x%x\t" | |
1942 | "%u\t" | |
1943 | "%u\t" | |
1944 | "%d\t" | |
1945 | "%d\t", | |
1946 | OCFS2_DLM_DEBUG_STR_VERSION, | |
1947 | OCFS2_LOCK_ID_MAX_LEN, lockres->l_name, | |
1948 | lockres->l_level, | |
1949 | lockres->l_flags, | |
1950 | lockres->l_action, | |
1951 | lockres->l_unlock_action, | |
1952 | lockres->l_ro_holders, | |
1953 | lockres->l_ex_holders, | |
1954 | lockres->l_requested, | |
1955 | lockres->l_blocking); | |
1956 | ||
1957 | /* Dump the raw LVB */ | |
1958 | lvb = lockres->l_lksb.lvb; | |
1959 | for(i = 0; i < DLM_LVB_LEN; i++) | |
1960 | seq_printf(m, "0x%x\t", lvb[i]); | |
1961 | ||
1962 | /* End the line */ | |
1963 | seq_printf(m, "\n"); | |
1964 | return 0; | |
1965 | } | |
1966 | ||
1967 | static struct seq_operations ocfs2_dlm_seq_ops = { | |
1968 | .start = ocfs2_dlm_seq_start, | |
1969 | .stop = ocfs2_dlm_seq_stop, | |
1970 | .next = ocfs2_dlm_seq_next, | |
1971 | .show = ocfs2_dlm_seq_show, | |
1972 | }; | |
1973 | ||
1974 | static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file) | |
1975 | { | |
1976 | struct seq_file *seq = (struct seq_file *) file->private_data; | |
1977 | struct ocfs2_dlm_seq_priv *priv = seq->private; | |
1978 | struct ocfs2_lock_res *res = &priv->p_iter_res; | |
1979 | ||
1980 | ocfs2_remove_lockres_tracking(res); | |
1981 | ocfs2_put_dlm_debug(priv->p_dlm_debug); | |
1982 | return seq_release_private(inode, file); | |
1983 | } | |
1984 | ||
1985 | static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file) | |
1986 | { | |
1987 | int ret; | |
1988 | struct ocfs2_dlm_seq_priv *priv; | |
1989 | struct seq_file *seq; | |
1990 | struct ocfs2_super *osb; | |
1991 | ||
1992 | priv = kzalloc(sizeof(struct ocfs2_dlm_seq_priv), GFP_KERNEL); | |
1993 | if (!priv) { | |
1994 | ret = -ENOMEM; | |
1995 | mlog_errno(ret); | |
1996 | goto out; | |
1997 | } | |
1998 | osb = (struct ocfs2_super *) inode->u.generic_ip; | |
1999 | ocfs2_get_dlm_debug(osb->osb_dlm_debug); | |
2000 | priv->p_dlm_debug = osb->osb_dlm_debug; | |
2001 | INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list); | |
2002 | ||
2003 | ret = seq_open(file, &ocfs2_dlm_seq_ops); | |
2004 | if (ret) { | |
2005 | kfree(priv); | |
2006 | mlog_errno(ret); | |
2007 | goto out; | |
2008 | } | |
2009 | ||
2010 | seq = (struct seq_file *) file->private_data; | |
2011 | seq->private = priv; | |
2012 | ||
2013 | ocfs2_add_lockres_tracking(&priv->p_iter_res, | |
2014 | priv->p_dlm_debug); | |
2015 | ||
2016 | out: | |
2017 | return ret; | |
2018 | } | |
2019 | ||
2020 | static struct file_operations ocfs2_dlm_debug_fops = { | |
2021 | .open = ocfs2_dlm_debug_open, | |
2022 | .release = ocfs2_dlm_debug_release, | |
2023 | .read = seq_read, | |
2024 | .llseek = seq_lseek, | |
2025 | }; | |
2026 | ||
2027 | static int ocfs2_dlm_init_debug(struct ocfs2_super *osb) | |
2028 | { | |
2029 | int ret = 0; | |
2030 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; | |
2031 | ||
2032 | dlm_debug->d_locking_state = debugfs_create_file("locking_state", | |
2033 | S_IFREG|S_IRUSR, | |
2034 | osb->osb_debug_root, | |
2035 | osb, | |
2036 | &ocfs2_dlm_debug_fops); | |
2037 | if (!dlm_debug->d_locking_state) { | |
2038 | ret = -EINVAL; | |
2039 | mlog(ML_ERROR, | |
2040 | "Unable to create locking state debugfs file.\n"); | |
2041 | goto out; | |
2042 | } | |
2043 | ||
2044 | ocfs2_get_dlm_debug(dlm_debug); | |
2045 | out: | |
2046 | return ret; | |
2047 | } | |
2048 | ||
2049 | static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb) | |
2050 | { | |
2051 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; | |
2052 | ||
2053 | if (dlm_debug) { | |
2054 | debugfs_remove(dlm_debug->d_locking_state); | |
2055 | ocfs2_put_dlm_debug(dlm_debug); | |
2056 | } | |
2057 | } | |
2058 | ||
2059 | int ocfs2_dlm_init(struct ocfs2_super *osb) | |
2060 | { | |
2061 | int status; | |
2062 | u32 dlm_key; | |
2063 | struct dlm_ctxt *dlm; | |
2064 | ||
2065 | mlog_entry_void(); | |
2066 | ||
2067 | status = ocfs2_dlm_init_debug(osb); | |
2068 | if (status < 0) { | |
2069 | mlog_errno(status); | |
2070 | goto bail; | |
2071 | } | |
2072 | ||
2073 | /* launch vote thread */ | |
2074 | osb->vote_task = kthread_run(ocfs2_vote_thread, osb, "ocfs2vote-%d", | |
2075 | osb->osb_id); | |
2076 | if (IS_ERR(osb->vote_task)) { | |
2077 | status = PTR_ERR(osb->vote_task); | |
2078 | osb->vote_task = NULL; | |
2079 | mlog_errno(status); | |
2080 | goto bail; | |
2081 | } | |
2082 | ||
2083 | /* used by the dlm code to make message headers unique, each | |
2084 | * node in this domain must agree on this. */ | |
2085 | dlm_key = crc32_le(0, osb->uuid_str, strlen(osb->uuid_str)); | |
2086 | ||
2087 | /* for now, uuid == domain */ | |
2088 | dlm = dlm_register_domain(osb->uuid_str, dlm_key); | |
2089 | if (IS_ERR(dlm)) { | |
2090 | status = PTR_ERR(dlm); | |
2091 | mlog_errno(status); | |
2092 | goto bail; | |
2093 | } | |
2094 | ||
2095 | ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb); | |
2096 | ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb); | |
2097 | ||
2098 | dlm_register_eviction_cb(dlm, &osb->osb_eviction_cb); | |
2099 | ||
2100 | osb->dlm = dlm; | |
2101 | ||
2102 | status = 0; | |
2103 | bail: | |
2104 | if (status < 0) { | |
2105 | ocfs2_dlm_shutdown_debug(osb); | |
2106 | if (osb->vote_task) | |
2107 | kthread_stop(osb->vote_task); | |
2108 | } | |
2109 | ||
2110 | mlog_exit(status); | |
2111 | return status; | |
2112 | } | |
2113 | ||
2114 | void ocfs2_dlm_shutdown(struct ocfs2_super *osb) | |
2115 | { | |
2116 | mlog_entry_void(); | |
2117 | ||
2118 | dlm_unregister_eviction_cb(&osb->osb_eviction_cb); | |
2119 | ||
2120 | ocfs2_drop_osb_locks(osb); | |
2121 | ||
2122 | if (osb->vote_task) { | |
2123 | kthread_stop(osb->vote_task); | |
2124 | osb->vote_task = NULL; | |
2125 | } | |
2126 | ||
2127 | ocfs2_lock_res_free(&osb->osb_super_lockres); | |
2128 | ocfs2_lock_res_free(&osb->osb_rename_lockres); | |
2129 | ||
2130 | dlm_unregister_domain(osb->dlm); | |
2131 | osb->dlm = NULL; | |
2132 | ||
2133 | ocfs2_dlm_shutdown_debug(osb); | |
2134 | ||
2135 | mlog_exit_void(); | |
2136 | } | |
2137 | ||
2138 | static void ocfs2_unlock_ast_func(void *opaque, enum dlm_status status) | |
2139 | { | |
2140 | struct ocfs2_lock_res *lockres = opaque; | |
2141 | unsigned long flags; | |
2142 | ||
2143 | mlog_entry_void(); | |
2144 | ||
2145 | mlog(0, "UNLOCK AST called on lock %s, action = %d\n", lockres->l_name, | |
2146 | lockres->l_unlock_action); | |
2147 | ||
2148 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2149 | /* We tried to cancel a convert request, but it was already | |
2150 | * granted. All we want to do here is clear our unlock | |
2151 | * state. The wake_up call done at the bottom is redundant | |
2152 | * (ocfs2_prepare_cancel_convert doesn't sleep on this) but doesn't | |
2153 | * hurt anything anyway */ | |
2154 | if (status == DLM_CANCELGRANT && | |
2155 | lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { | |
2156 | mlog(0, "Got cancelgrant for %s\n", lockres->l_name); | |
2157 | ||
2158 | /* We don't clear the busy flag in this case as it | |
2159 | * should have been cleared by the ast which the dlm | |
2160 | * has called. */ | |
2161 | goto complete_unlock; | |
2162 | } | |
2163 | ||
2164 | if (status != DLM_NORMAL) { | |
2165 | mlog(ML_ERROR, "Dlm passes status %d for lock %s, " | |
2166 | "unlock_action %d\n", status, lockres->l_name, | |
2167 | lockres->l_unlock_action); | |
2168 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2169 | return; | |
2170 | } | |
2171 | ||
2172 | switch(lockres->l_unlock_action) { | |
2173 | case OCFS2_UNLOCK_CANCEL_CONVERT: | |
2174 | mlog(0, "Cancel convert success for %s\n", lockres->l_name); | |
2175 | lockres->l_action = OCFS2_AST_INVALID; | |
2176 | break; | |
2177 | case OCFS2_UNLOCK_DROP_LOCK: | |
2178 | lockres->l_level = LKM_IVMODE; | |
2179 | break; | |
2180 | default: | |
2181 | BUG(); | |
2182 | } | |
2183 | ||
2184 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
2185 | complete_unlock: | |
2186 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
2187 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2188 | ||
2189 | wake_up(&lockres->l_event); | |
2190 | ||
2191 | mlog_exit_void(); | |
2192 | } | |
2193 | ||
2194 | typedef void (ocfs2_pre_drop_cb_t)(struct ocfs2_lock_res *, void *); | |
2195 | ||
2196 | struct drop_lock_cb { | |
2197 | ocfs2_pre_drop_cb_t *drop_func; | |
2198 | void *drop_data; | |
2199 | }; | |
2200 | ||
2201 | static int ocfs2_drop_lock(struct ocfs2_super *osb, | |
2202 | struct ocfs2_lock_res *lockres, | |
2203 | struct drop_lock_cb *dcb) | |
2204 | { | |
2205 | enum dlm_status status; | |
2206 | unsigned long flags; | |
2207 | ||
2208 | /* We didn't get anywhere near actually using this lockres. */ | |
2209 | if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) | |
2210 | goto out; | |
2211 | ||
2212 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2213 | ||
2214 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING), | |
2215 | "lockres %s, flags 0x%lx\n", | |
2216 | lockres->l_name, lockres->l_flags); | |
2217 | ||
2218 | while (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
2219 | mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = " | |
2220 | "%u, unlock_action = %u\n", | |
2221 | lockres->l_name, lockres->l_flags, lockres->l_action, | |
2222 | lockres->l_unlock_action); | |
2223 | ||
2224 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2225 | ||
2226 | /* XXX: Today we just wait on any busy | |
2227 | * locks... Perhaps we need to cancel converts in the | |
2228 | * future? */ | |
2229 | ocfs2_wait_on_busy_lock(lockres); | |
2230 | ||
2231 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2232 | } | |
2233 | ||
2234 | if (dcb) | |
2235 | dcb->drop_func(lockres, dcb->drop_data); | |
2236 | ||
2237 | if (lockres->l_flags & OCFS2_LOCK_BUSY) | |
2238 | mlog(ML_ERROR, "destroying busy lock: \"%s\"\n", | |
2239 | lockres->l_name); | |
2240 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) | |
2241 | mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name); | |
2242 | ||
2243 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { | |
2244 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2245 | goto out; | |
2246 | } | |
2247 | ||
2248 | lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED); | |
2249 | ||
2250 | /* make sure we never get here while waiting for an ast to | |
2251 | * fire. */ | |
2252 | BUG_ON(lockres->l_action != OCFS2_AST_INVALID); | |
2253 | ||
2254 | /* is this necessary? */ | |
2255 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
2256 | lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK; | |
2257 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2258 | ||
2259 | mlog(0, "lock %s\n", lockres->l_name); | |
2260 | ||
2261 | status = dlmunlock(osb->dlm, &lockres->l_lksb, LKM_VALBLK, | |
2262 | lockres->l_ops->unlock_ast, lockres); | |
2263 | if (status != DLM_NORMAL) { | |
2264 | ocfs2_log_dlm_error("dlmunlock", status, lockres); | |
2265 | mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags); | |
2266 | dlm_print_one_lock(lockres->l_lksb.lockid); | |
2267 | BUG(); | |
2268 | } | |
2269 | mlog(0, "lock %s, successfull return from dlmunlock\n", | |
2270 | lockres->l_name); | |
2271 | ||
2272 | ocfs2_wait_on_busy_lock(lockres); | |
2273 | out: | |
2274 | mlog_exit(0); | |
2275 | return 0; | |
2276 | } | |
2277 | ||
2278 | /* Mark the lockres as being dropped. It will no longer be | |
2279 | * queued if blocking, but we still may have to wait on it | |
2280 | * being dequeued from the vote thread before we can consider | |
2281 | * it safe to drop. | |
2282 | * | |
2283 | * You can *not* attempt to call cluster_lock on this lockres anymore. */ | |
2284 | void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres) | |
2285 | { | |
2286 | int status; | |
2287 | struct ocfs2_mask_waiter mw; | |
2288 | unsigned long flags; | |
2289 | ||
2290 | ocfs2_init_mask_waiter(&mw); | |
2291 | ||
2292 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2293 | lockres->l_flags |= OCFS2_LOCK_FREEING; | |
2294 | while (lockres->l_flags & OCFS2_LOCK_QUEUED) { | |
2295 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0); | |
2296 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2297 | ||
2298 | mlog(0, "Waiting on lockres %s\n", lockres->l_name); | |
2299 | ||
2300 | status = ocfs2_wait_for_mask(&mw); | |
2301 | if (status) | |
2302 | mlog_errno(status); | |
2303 | ||
2304 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2305 | } | |
2306 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2307 | } | |
2308 | ||
2309 | static void ocfs2_drop_osb_locks(struct ocfs2_super *osb) | |
2310 | { | |
2311 | int status; | |
2312 | ||
2313 | mlog_entry_void(); | |
2314 | ||
2315 | ocfs2_mark_lockres_freeing(&osb->osb_super_lockres); | |
2316 | ||
2317 | status = ocfs2_drop_lock(osb, &osb->osb_super_lockres, NULL); | |
2318 | if (status < 0) | |
2319 | mlog_errno(status); | |
2320 | ||
2321 | ocfs2_mark_lockres_freeing(&osb->osb_rename_lockres); | |
2322 | ||
2323 | status = ocfs2_drop_lock(osb, &osb->osb_rename_lockres, NULL); | |
2324 | if (status < 0) | |
2325 | mlog_errno(status); | |
2326 | ||
2327 | mlog_exit(status); | |
2328 | } | |
2329 | ||
2330 | static void ocfs2_meta_pre_drop(struct ocfs2_lock_res *lockres, void *data) | |
2331 | { | |
2332 | struct inode *inode = data; | |
2333 | ||
2334 | /* the metadata lock requires a bit more work as we have an | |
2335 | * LVB to worry about. */ | |
2336 | if (lockres->l_flags & OCFS2_LOCK_ATTACHED && | |
2337 | lockres->l_level == LKM_EXMODE && | |
2338 | !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) | |
2339 | __ocfs2_stuff_meta_lvb(inode); | |
2340 | } | |
2341 | ||
2342 | int ocfs2_drop_inode_locks(struct inode *inode) | |
2343 | { | |
2344 | int status, err; | |
2345 | struct drop_lock_cb meta_dcb = { ocfs2_meta_pre_drop, inode, }; | |
2346 | ||
2347 | mlog_entry_void(); | |
2348 | ||
2349 | /* No need to call ocfs2_mark_lockres_freeing here - | |
2350 | * ocfs2_clear_inode has done it for us. */ | |
2351 | ||
2352 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
2353 | &OCFS2_I(inode)->ip_data_lockres, | |
2354 | NULL); | |
2355 | if (err < 0) | |
2356 | mlog_errno(err); | |
2357 | ||
2358 | status = err; | |
2359 | ||
2360 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
2361 | &OCFS2_I(inode)->ip_meta_lockres, | |
2362 | &meta_dcb); | |
2363 | if (err < 0) | |
2364 | mlog_errno(err); | |
2365 | if (err < 0 && !status) | |
2366 | status = err; | |
2367 | ||
2368 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
2369 | &OCFS2_I(inode)->ip_rw_lockres, | |
2370 | NULL); | |
2371 | if (err < 0) | |
2372 | mlog_errno(err); | |
2373 | if (err < 0 && !status) | |
2374 | status = err; | |
2375 | ||
2376 | mlog_exit(status); | |
2377 | return status; | |
2378 | } | |
2379 | ||
2380 | static void ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres, | |
2381 | int new_level) | |
2382 | { | |
2383 | assert_spin_locked(&lockres->l_lock); | |
2384 | ||
2385 | BUG_ON(lockres->l_blocking <= LKM_NLMODE); | |
2386 | ||
2387 | if (lockres->l_level <= new_level) { | |
2388 | mlog(ML_ERROR, "lockres->l_level (%u) <= new_level (%u)\n", | |
2389 | lockres->l_level, new_level); | |
2390 | BUG(); | |
2391 | } | |
2392 | ||
2393 | mlog(0, "lock %s, new_level = %d, l_blocking = %d\n", | |
2394 | lockres->l_name, new_level, lockres->l_blocking); | |
2395 | ||
2396 | lockres->l_action = OCFS2_AST_DOWNCONVERT; | |
2397 | lockres->l_requested = new_level; | |
2398 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
2399 | } | |
2400 | ||
2401 | static int ocfs2_downconvert_lock(struct ocfs2_super *osb, | |
2402 | struct ocfs2_lock_res *lockres, | |
2403 | int new_level, | |
2404 | int lvb) | |
2405 | { | |
2406 | int ret, dlm_flags = LKM_CONVERT; | |
2407 | enum dlm_status status; | |
2408 | ||
2409 | mlog_entry_void(); | |
2410 | ||
2411 | if (lvb) | |
2412 | dlm_flags |= LKM_VALBLK; | |
2413 | ||
2414 | status = dlmlock(osb->dlm, | |
2415 | new_level, | |
2416 | &lockres->l_lksb, | |
2417 | dlm_flags, | |
2418 | lockres->l_name, | |
2419 | lockres->l_ops->ast, | |
2420 | lockres, | |
2421 | lockres->l_ops->bast); | |
2422 | if (status != DLM_NORMAL) { | |
2423 | ocfs2_log_dlm_error("dlmlock", status, lockres); | |
2424 | ret = -EINVAL; | |
2425 | ocfs2_recover_from_dlm_error(lockres, 1); | |
2426 | goto bail; | |
2427 | } | |
2428 | ||
2429 | ret = 0; | |
2430 | bail: | |
2431 | mlog_exit(ret); | |
2432 | return ret; | |
2433 | } | |
2434 | ||
2435 | /* returns 1 when the caller should unlock and call dlmunlock */ | |
2436 | static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb, | |
2437 | struct ocfs2_lock_res *lockres) | |
2438 | { | |
2439 | assert_spin_locked(&lockres->l_lock); | |
2440 | ||
2441 | mlog_entry_void(); | |
2442 | mlog(0, "lock %s\n", lockres->l_name); | |
2443 | ||
2444 | if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { | |
2445 | /* If we're already trying to cancel a lock conversion | |
2446 | * then just drop the spinlock and allow the caller to | |
2447 | * requeue this lock. */ | |
2448 | ||
2449 | mlog(0, "Lockres %s, skip convert\n", lockres->l_name); | |
2450 | return 0; | |
2451 | } | |
2452 | ||
2453 | /* were we in a convert when we got the bast fire? */ | |
2454 | BUG_ON(lockres->l_action != OCFS2_AST_CONVERT && | |
2455 | lockres->l_action != OCFS2_AST_DOWNCONVERT); | |
2456 | /* set things up for the unlockast to know to just | |
2457 | * clear out the ast_action and unset busy, etc. */ | |
2458 | lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT; | |
2459 | ||
2460 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY), | |
2461 | "lock %s, invalid flags: 0x%lx\n", | |
2462 | lockres->l_name, lockres->l_flags); | |
2463 | ||
2464 | return 1; | |
2465 | } | |
2466 | ||
2467 | static int ocfs2_cancel_convert(struct ocfs2_super *osb, | |
2468 | struct ocfs2_lock_res *lockres) | |
2469 | { | |
2470 | int ret; | |
2471 | enum dlm_status status; | |
2472 | ||
2473 | mlog_entry_void(); | |
2474 | mlog(0, "lock %s\n", lockres->l_name); | |
2475 | ||
2476 | ret = 0; | |
2477 | status = dlmunlock(osb->dlm, | |
2478 | &lockres->l_lksb, | |
2479 | LKM_CANCEL, | |
2480 | lockres->l_ops->unlock_ast, | |
2481 | lockres); | |
2482 | if (status != DLM_NORMAL) { | |
2483 | ocfs2_log_dlm_error("dlmunlock", status, lockres); | |
2484 | ret = -EINVAL; | |
2485 | ocfs2_recover_from_dlm_error(lockres, 0); | |
2486 | } | |
2487 | ||
2488 | mlog(0, "lock %s return from dlmunlock\n", lockres->l_name); | |
2489 | ||
2490 | mlog_exit(ret); | |
2491 | return ret; | |
2492 | } | |
2493 | ||
2494 | static inline int ocfs2_can_downconvert_meta_lock(struct inode *inode, | |
2495 | struct ocfs2_lock_res *lockres, | |
2496 | int new_level) | |
2497 | { | |
2498 | int ret; | |
2499 | ||
2500 | mlog_entry_void(); | |
2501 | ||
2502 | BUG_ON(new_level != LKM_NLMODE && new_level != LKM_PRMODE); | |
2503 | ||
2504 | if (lockres->l_flags & OCFS2_LOCK_REFRESHING) { | |
2505 | ret = 0; | |
2506 | mlog(0, "lockres %s currently being refreshed -- backing " | |
2507 | "off!\n", lockres->l_name); | |
2508 | } else if (new_level == LKM_PRMODE) | |
2509 | ret = !lockres->l_ex_holders && | |
2510 | ocfs2_inode_fully_checkpointed(inode); | |
2511 | else /* Must be NLMODE we're converting to. */ | |
2512 | ret = !lockres->l_ro_holders && !lockres->l_ex_holders && | |
2513 | ocfs2_inode_fully_checkpointed(inode); | |
2514 | ||
2515 | mlog_exit(ret); | |
2516 | return ret; | |
2517 | } | |
2518 | ||
2519 | static int ocfs2_do_unblock_meta(struct inode *inode, | |
2520 | int *requeue) | |
2521 | { | |
2522 | int new_level; | |
2523 | int set_lvb = 0; | |
2524 | int ret = 0; | |
2525 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres; | |
2526 | unsigned long flags; | |
2527 | ||
2528 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
2529 | ||
2530 | mlog_entry_void(); | |
2531 | ||
2532 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2533 | ||
2534 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
2535 | ||
2536 | mlog(0, "l_level=%d, l_blocking=%d\n", lockres->l_level, | |
2537 | lockres->l_blocking); | |
2538 | ||
2539 | BUG_ON(lockres->l_level != LKM_EXMODE && | |
2540 | lockres->l_level != LKM_PRMODE); | |
2541 | ||
2542 | if (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
2543 | *requeue = 1; | |
2544 | ret = ocfs2_prepare_cancel_convert(osb, lockres); | |
2545 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2546 | if (ret) { | |
2547 | ret = ocfs2_cancel_convert(osb, lockres); | |
2548 | if (ret < 0) | |
2549 | mlog_errno(ret); | |
2550 | } | |
2551 | goto leave; | |
2552 | } | |
2553 | ||
2554 | new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking); | |
2555 | ||
2556 | mlog(0, "l_level=%d, l_blocking=%d, new_level=%d\n", | |
2557 | lockres->l_level, lockres->l_blocking, new_level); | |
2558 | ||
2559 | if (ocfs2_can_downconvert_meta_lock(inode, lockres, new_level)) { | |
2560 | if (lockres->l_level == LKM_EXMODE) | |
2561 | set_lvb = 1; | |
2562 | ||
2563 | /* If the lock hasn't been refreshed yet (rare), then | |
2564 | * our memory inode values are old and we skip | |
2565 | * stuffing the lvb. There's no need to actually clear | |
2566 | * out the lvb here as it's value is still valid. */ | |
2567 | if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) { | |
2568 | if (set_lvb) | |
2569 | __ocfs2_stuff_meta_lvb(inode); | |
2570 | } else | |
2571 | mlog(0, "lockres %s: downconverting stale lock!\n", | |
2572 | lockres->l_name); | |
2573 | ||
2574 | mlog(0, "calling ocfs2_downconvert_lock with l_level=%d, " | |
2575 | "l_blocking=%d, new_level=%d\n", | |
2576 | lockres->l_level, lockres->l_blocking, new_level); | |
2577 | ||
2578 | ocfs2_prepare_downconvert(lockres, new_level); | |
2579 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2580 | ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb); | |
2581 | goto leave; | |
2582 | } | |
2583 | if (!ocfs2_inode_fully_checkpointed(inode)) | |
2584 | ocfs2_start_checkpoint(osb); | |
2585 | ||
2586 | *requeue = 1; | |
2587 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2588 | ret = 0; | |
2589 | leave: | |
2590 | mlog_exit(ret); | |
2591 | return ret; | |
2592 | } | |
2593 | ||
2594 | static int ocfs2_generic_unblock_lock(struct ocfs2_super *osb, | |
2595 | struct ocfs2_lock_res *lockres, | |
2596 | int *requeue, | |
2597 | ocfs2_convert_worker_t *worker) | |
2598 | { | |
2599 | unsigned long flags; | |
2600 | int blocking; | |
2601 | int new_level; | |
2602 | int ret = 0; | |
2603 | ||
2604 | mlog_entry_void(); | |
2605 | ||
2606 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2607 | ||
2608 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
2609 | ||
2610 | recheck: | |
2611 | if (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
2612 | *requeue = 1; | |
2613 | ret = ocfs2_prepare_cancel_convert(osb, lockres); | |
2614 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2615 | if (ret) { | |
2616 | ret = ocfs2_cancel_convert(osb, lockres); | |
2617 | if (ret < 0) | |
2618 | mlog_errno(ret); | |
2619 | } | |
2620 | goto leave; | |
2621 | } | |
2622 | ||
2623 | /* if we're blocking an exclusive and we have *any* holders, | |
2624 | * then requeue. */ | |
2625 | if ((lockres->l_blocking == LKM_EXMODE) | |
2626 | && (lockres->l_ex_holders || lockres->l_ro_holders)) { | |
2627 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2628 | *requeue = 1; | |
2629 | ret = 0; | |
2630 | goto leave; | |
2631 | } | |
2632 | ||
2633 | /* If it's a PR we're blocking, then only | |
2634 | * requeue if we've got any EX holders */ | |
2635 | if (lockres->l_blocking == LKM_PRMODE && | |
2636 | lockres->l_ex_holders) { | |
2637 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2638 | *requeue = 1; | |
2639 | ret = 0; | |
2640 | goto leave; | |
2641 | } | |
2642 | ||
2643 | /* If we get here, then we know that there are no more | |
2644 | * incompatible holders (and anyone asking for an incompatible | |
2645 | * lock is blocked). We can now downconvert the lock */ | |
2646 | if (!worker) | |
2647 | goto downconvert; | |
2648 | ||
2649 | /* Some lockres types want to do a bit of work before | |
2650 | * downconverting a lock. Allow that here. The worker function | |
2651 | * may sleep, so we save off a copy of what we're blocking as | |
2652 | * it may change while we're not holding the spin lock. */ | |
2653 | blocking = lockres->l_blocking; | |
2654 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2655 | ||
2656 | worker(lockres, blocking); | |
2657 | ||
2658 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2659 | if (blocking != lockres->l_blocking) { | |
2660 | /* If this changed underneath us, then we can't drop | |
2661 | * it just yet. */ | |
2662 | goto recheck; | |
2663 | } | |
2664 | ||
2665 | downconvert: | |
2666 | *requeue = 0; | |
2667 | new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking); | |
2668 | ||
2669 | ocfs2_prepare_downconvert(lockres, new_level); | |
2670 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2671 | ret = ocfs2_downconvert_lock(osb, lockres, new_level, 0); | |
2672 | leave: | |
2673 | mlog_exit(ret); | |
2674 | return ret; | |
2675 | } | |
2676 | ||
2677 | static void ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, | |
2678 | int blocking) | |
2679 | { | |
2680 | struct inode *inode; | |
2681 | struct address_space *mapping; | |
2682 | ||
2683 | mlog_entry_void(); | |
2684 | ||
2685 | inode = ocfs2_lock_res_inode(lockres); | |
2686 | mapping = inode->i_mapping; | |
2687 | ||
2688 | if (filemap_fdatawrite(mapping)) { | |
2689 | mlog(ML_ERROR, "Could not sync inode %"MLFu64" for downconvert!", | |
2690 | OCFS2_I(inode)->ip_blkno); | |
2691 | } | |
2692 | sync_mapping_buffers(mapping); | |
2693 | if (blocking == LKM_EXMODE) { | |
2694 | truncate_inode_pages(mapping, 0); | |
2695 | unmap_mapping_range(mapping, 0, 0, 0); | |
2696 | } else { | |
2697 | /* We only need to wait on the I/O if we're not also | |
2698 | * truncating pages because truncate_inode_pages waits | |
2699 | * for us above. We don't truncate pages if we're | |
2700 | * blocking anything < EXMODE because we want to keep | |
2701 | * them around in that case. */ | |
2702 | filemap_fdatawait(mapping); | |
2703 | } | |
2704 | ||
2705 | mlog_exit_void(); | |
2706 | } | |
2707 | ||
2708 | int ocfs2_unblock_data(struct ocfs2_lock_res *lockres, | |
2709 | int *requeue) | |
2710 | { | |
2711 | int status; | |
2712 | struct inode *inode; | |
2713 | struct ocfs2_super *osb; | |
2714 | ||
2715 | mlog_entry_void(); | |
2716 | ||
2717 | inode = ocfs2_lock_res_inode(lockres); | |
2718 | osb = OCFS2_SB(inode->i_sb); | |
2719 | ||
2720 | mlog(0, "unblock inode %"MLFu64"\n", OCFS2_I(inode)->ip_blkno); | |
2721 | ||
2722 | status = ocfs2_generic_unblock_lock(osb, | |
2723 | lockres, | |
2724 | requeue, | |
2725 | ocfs2_data_convert_worker); | |
2726 | if (status < 0) | |
2727 | mlog_errno(status); | |
2728 | ||
2729 | mlog(0, "inode %"MLFu64", requeue = %d\n", | |
2730 | OCFS2_I(inode)->ip_blkno, *requeue); | |
2731 | ||
2732 | mlog_exit(status); | |
2733 | return status; | |
2734 | } | |
2735 | ||
2736 | static int ocfs2_unblock_inode_lock(struct ocfs2_lock_res *lockres, | |
2737 | int *requeue) | |
2738 | { | |
2739 | int status; | |
2740 | struct inode *inode; | |
2741 | ||
2742 | mlog_entry_void(); | |
2743 | ||
2744 | mlog(0, "Unblock lockres %s\n", lockres->l_name); | |
2745 | ||
2746 | inode = ocfs2_lock_res_inode(lockres); | |
2747 | ||
2748 | status = ocfs2_generic_unblock_lock(OCFS2_SB(inode->i_sb), | |
2749 | lockres, | |
2750 | requeue, | |
2751 | NULL); | |
2752 | if (status < 0) | |
2753 | mlog_errno(status); | |
2754 | ||
2755 | mlog_exit(status); | |
2756 | return status; | |
2757 | } | |
2758 | ||
2759 | ||
2760 | int ocfs2_unblock_meta(struct ocfs2_lock_res *lockres, | |
2761 | int *requeue) | |
2762 | { | |
2763 | int status; | |
2764 | struct inode *inode; | |
2765 | ||
2766 | mlog_entry_void(); | |
2767 | ||
2768 | inode = ocfs2_lock_res_inode(lockres); | |
2769 | ||
2770 | mlog(0, "unblock inode %"MLFu64"\n", OCFS2_I(inode)->ip_blkno); | |
2771 | ||
2772 | status = ocfs2_do_unblock_meta(inode, requeue); | |
2773 | if (status < 0) | |
2774 | mlog_errno(status); | |
2775 | ||
2776 | mlog(0, "inode %"MLFu64", requeue = %d\n", | |
2777 | OCFS2_I(inode)->ip_blkno, *requeue); | |
2778 | ||
2779 | mlog_exit(status); | |
2780 | return status; | |
2781 | } | |
2782 | ||
2783 | /* Generic unblock function for any lockres whose private data is an | |
2784 | * ocfs2_super pointer. */ | |
2785 | static int ocfs2_unblock_osb_lock(struct ocfs2_lock_res *lockres, | |
2786 | int *requeue) | |
2787 | { | |
2788 | int status; | |
2789 | struct ocfs2_super *osb; | |
2790 | ||
2791 | mlog_entry_void(); | |
2792 | ||
2793 | mlog(0, "Unblock lockres %s\n", lockres->l_name); | |
2794 | ||
2795 | osb = ocfs2_lock_res_super(lockres); | |
2796 | ||
2797 | status = ocfs2_generic_unblock_lock(osb, | |
2798 | lockres, | |
2799 | requeue, | |
2800 | NULL); | |
2801 | if (status < 0) | |
2802 | mlog_errno(status); | |
2803 | ||
2804 | mlog_exit(status); | |
2805 | return status; | |
2806 | } | |
2807 | ||
2808 | void ocfs2_process_blocked_lock(struct ocfs2_super *osb, | |
2809 | struct ocfs2_lock_res *lockres) | |
2810 | { | |
2811 | int status; | |
2812 | int requeue = 0; | |
2813 | unsigned long flags; | |
2814 | ||
2815 | /* Our reference to the lockres in this function can be | |
2816 | * considered valid until we remove the OCFS2_LOCK_QUEUED | |
2817 | * flag. */ | |
2818 | ||
2819 | mlog_entry_void(); | |
2820 | ||
2821 | BUG_ON(!lockres); | |
2822 | BUG_ON(!lockres->l_ops); | |
2823 | BUG_ON(!lockres->l_ops->unblock); | |
2824 | ||
2825 | mlog(0, "lockres %s blocked.\n", lockres->l_name); | |
2826 | ||
2827 | /* Detect whether a lock has been marked as going away while | |
2828 | * the vote thread was processing other things. A lock can | |
2829 | * still be marked with OCFS2_LOCK_FREEING after this check, | |
2830 | * but short circuiting here will still save us some | |
2831 | * performance. */ | |
2832 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2833 | if (lockres->l_flags & OCFS2_LOCK_FREEING) | |
2834 | goto unqueue; | |
2835 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2836 | ||
2837 | status = lockres->l_ops->unblock(lockres, &requeue); | |
2838 | if (status < 0) | |
2839 | mlog_errno(status); | |
2840 | ||
2841 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2842 | unqueue: | |
2843 | if (lockres->l_flags & OCFS2_LOCK_FREEING || !requeue) { | |
2844 | lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED); | |
2845 | } else | |
2846 | ocfs2_schedule_blocked_lock(osb, lockres); | |
2847 | ||
2848 | mlog(0, "lockres %s, requeue = %s.\n", lockres->l_name, | |
2849 | requeue ? "yes" : "no"); | |
2850 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2851 | ||
2852 | mlog_exit_void(); | |
2853 | } | |
2854 | ||
2855 | static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, | |
2856 | struct ocfs2_lock_res *lockres) | |
2857 | { | |
2858 | mlog_entry_void(); | |
2859 | ||
2860 | assert_spin_locked(&lockres->l_lock); | |
2861 | ||
2862 | if (lockres->l_flags & OCFS2_LOCK_FREEING) { | |
2863 | /* Do not schedule a lock for downconvert when it's on | |
2864 | * the way to destruction - any nodes wanting access | |
2865 | * to the resource will get it soon. */ | |
2866 | mlog(0, "Lockres %s won't be scheduled: flags 0x%lx\n", | |
2867 | lockres->l_name, lockres->l_flags); | |
2868 | return; | |
2869 | } | |
2870 | ||
2871 | lockres_or_flags(lockres, OCFS2_LOCK_QUEUED); | |
2872 | ||
2873 | spin_lock(&osb->vote_task_lock); | |
2874 | if (list_empty(&lockres->l_blocked_list)) { | |
2875 | list_add_tail(&lockres->l_blocked_list, | |
2876 | &osb->blocked_lock_list); | |
2877 | osb->blocked_lock_count++; | |
2878 | } | |
2879 | spin_unlock(&osb->vote_task_lock); | |
2880 | ||
2881 | mlog_exit_void(); | |
2882 | } | |
2883 | ||
2884 | /* This aids in debugging situations where a bad LVB might be involved. */ | |
2885 | void ocfs2_dump_meta_lvb_info(u64 level, | |
2886 | const char *function, | |
2887 | unsigned int line, | |
2888 | struct ocfs2_lock_res *lockres) | |
2889 | { | |
2890 | struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; | |
2891 | ||
2892 | mlog(level, "LVB information for %s (called from %s:%u):\n", | |
2893 | lockres->l_name, function, line); | |
2894 | mlog(level, "version: %u, clusters: %u\n", | |
2895 | be32_to_cpu(lvb->lvb_version), be32_to_cpu(lvb->lvb_iclusters)); | |
2896 | mlog(level, "size: %"MLFu64", uid %u, gid %u, mode 0x%x\n", | |
2897 | be64_to_cpu(lvb->lvb_isize), be32_to_cpu(lvb->lvb_iuid), | |
2898 | be32_to_cpu(lvb->lvb_igid), be16_to_cpu(lvb->lvb_imode)); | |
2899 | mlog(level, "nlink %u, atime_packed 0x%"MLFx64", " | |
2900 | "ctime_packed 0x%"MLFx64", mtime_packed 0x%"MLFx64"\n", | |
2901 | be16_to_cpu(lvb->lvb_inlink), be64_to_cpu(lvb->lvb_iatime_packed), | |
2902 | be64_to_cpu(lvb->lvb_ictime_packed), | |
2903 | be64_to_cpu(lvb->lvb_imtime_packed)); | |
2904 | } |