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ccd979bd MF |
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" | |
d680efe9 | 49 | #include "dcache.h" |
ccd979bd MF |
50 | #include "dlmglue.h" |
51 | #include "extent_map.h" | |
7f1a37e3 | 52 | #include "file.h" |
ccd979bd MF |
53 | #include "heartbeat.h" |
54 | #include "inode.h" | |
55 | #include "journal.h" | |
56 | #include "slot_map.h" | |
57 | #include "super.h" | |
58 | #include "uptodate.h" | |
59 | #include "vote.h" | |
60 | ||
61 | #include "buffer_head_io.h" | |
62 | ||
63 | struct ocfs2_mask_waiter { | |
64 | struct list_head mw_item; | |
65 | int mw_status; | |
66 | struct completion mw_complete; | |
67 | unsigned long mw_mask; | |
68 | unsigned long mw_goal; | |
69 | }; | |
70 | ||
54a7e755 MF |
71 | static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres); |
72 | static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres); | |
ccd979bd | 73 | |
d680efe9 | 74 | /* |
cc567d89 | 75 | * Return value from ->downconvert_worker functions. |
d680efe9 | 76 | * |
b5e500e2 | 77 | * These control the precise actions of ocfs2_unblock_lock() |
d680efe9 MF |
78 | * and ocfs2_process_blocked_lock() |
79 | * | |
80 | */ | |
81 | enum ocfs2_unblock_action { | |
82 | UNBLOCK_CONTINUE = 0, /* Continue downconvert */ | |
83 | UNBLOCK_CONTINUE_POST = 1, /* Continue downconvert, fire | |
84 | * ->post_unlock callback */ | |
85 | UNBLOCK_STOP_POST = 2, /* Do not downconvert, fire | |
86 | * ->post_unlock() callback. */ | |
87 | }; | |
88 | ||
89 | struct ocfs2_unblock_ctl { | |
90 | int requeue; | |
91 | enum ocfs2_unblock_action unblock_action; | |
92 | }; | |
93 | ||
810d5aeb MF |
94 | static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres, |
95 | int new_level); | |
96 | static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres); | |
97 | ||
cc567d89 MF |
98 | static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, |
99 | int blocking); | |
100 | ||
cc567d89 MF |
101 | static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, |
102 | int blocking); | |
d680efe9 MF |
103 | |
104 | static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, | |
105 | struct ocfs2_lock_res *lockres); | |
ccd979bd | 106 | |
f625c979 MF |
107 | /* |
108 | * OCFS2 Lock Resource Operations | |
109 | * | |
110 | * These fine tune the behavior of the generic dlmglue locking infrastructure. | |
0d5dc6c2 MF |
111 | * |
112 | * The most basic of lock types can point ->l_priv to their respective | |
113 | * struct ocfs2_super and allow the default actions to manage things. | |
114 | * | |
115 | * Right now, each lock type also needs to implement an init function, | |
116 | * and trivial lock/unlock wrappers. ocfs2_simple_drop_lockres() | |
117 | * should be called when the lock is no longer needed (i.e., object | |
118 | * destruction time). | |
f625c979 | 119 | */ |
ccd979bd | 120 | struct ocfs2_lock_res_ops { |
54a7e755 MF |
121 | /* |
122 | * Translate an ocfs2_lock_res * into an ocfs2_super *. Define | |
123 | * this callback if ->l_priv is not an ocfs2_super pointer | |
124 | */ | |
125 | struct ocfs2_super * (*get_osb)(struct ocfs2_lock_res *); | |
b5e500e2 | 126 | |
0d5dc6c2 MF |
127 | /* |
128 | * Optionally called in the downconvert (or "vote") thread | |
129 | * after a successful downconvert. The lockres will not be | |
130 | * referenced after this callback is called, so it is safe to | |
131 | * free memory, etc. | |
132 | * | |
133 | * The exact semantics of when this is called are controlled | |
134 | * by ->downconvert_worker() | |
135 | */ | |
d680efe9 | 136 | void (*post_unlock)(struct ocfs2_super *, struct ocfs2_lock_res *); |
f625c979 | 137 | |
16d5b956 MF |
138 | /* |
139 | * Allow a lock type to add checks to determine whether it is | |
140 | * safe to downconvert a lock. Return 0 to re-queue the | |
141 | * downconvert at a later time, nonzero to continue. | |
142 | * | |
143 | * For most locks, the default checks that there are no | |
144 | * incompatible holders are sufficient. | |
145 | * | |
146 | * Called with the lockres spinlock held. | |
147 | */ | |
148 | int (*check_downconvert)(struct ocfs2_lock_res *, int); | |
149 | ||
5ef0d4ea MF |
150 | /* |
151 | * Allows a lock type to populate the lock value block. This | |
152 | * is called on downconvert, and when we drop a lock. | |
153 | * | |
154 | * Locks that want to use this should set LOCK_TYPE_USES_LVB | |
155 | * in the flags field. | |
156 | * | |
157 | * Called with the lockres spinlock held. | |
158 | */ | |
159 | void (*set_lvb)(struct ocfs2_lock_res *); | |
160 | ||
cc567d89 MF |
161 | /* |
162 | * Called from the downconvert thread when it is determined | |
163 | * that a lock will be downconverted. This is called without | |
164 | * any locks held so the function can do work that might | |
165 | * schedule (syncing out data, etc). | |
166 | * | |
167 | * This should return any one of the ocfs2_unblock_action | |
168 | * values, depending on what it wants the thread to do. | |
169 | */ | |
170 | int (*downconvert_worker)(struct ocfs2_lock_res *, int); | |
171 | ||
f625c979 MF |
172 | /* |
173 | * LOCK_TYPE_* flags which describe the specific requirements | |
174 | * of a lock type. Descriptions of each individual flag follow. | |
175 | */ | |
176 | int flags; | |
ccd979bd MF |
177 | }; |
178 | ||
f625c979 MF |
179 | /* |
180 | * Some locks want to "refresh" potentially stale data when a | |
181 | * meaningful (PRMODE or EXMODE) lock level is first obtained. If this | |
182 | * flag is set, the OCFS2_LOCK_NEEDS_REFRESH flag will be set on the | |
183 | * individual lockres l_flags member from the ast function. It is | |
184 | * expected that the locking wrapper will clear the | |
185 | * OCFS2_LOCK_NEEDS_REFRESH flag when done. | |
186 | */ | |
187 | #define LOCK_TYPE_REQUIRES_REFRESH 0x1 | |
188 | ||
b80fc012 | 189 | /* |
5ef0d4ea MF |
190 | * Indicate that a lock type makes use of the lock value block. The |
191 | * ->set_lvb lock type callback must be defined. | |
b80fc012 MF |
192 | */ |
193 | #define LOCK_TYPE_USES_LVB 0x2 | |
194 | ||
ccd979bd | 195 | static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = { |
54a7e755 | 196 | .get_osb = ocfs2_get_inode_osb, |
f625c979 | 197 | .flags = 0, |
ccd979bd MF |
198 | }; |
199 | ||
200 | static struct ocfs2_lock_res_ops ocfs2_inode_meta_lops = { | |
54a7e755 | 201 | .get_osb = ocfs2_get_inode_osb, |
810d5aeb MF |
202 | .check_downconvert = ocfs2_check_meta_downconvert, |
203 | .set_lvb = ocfs2_set_meta_lvb, | |
b80fc012 | 204 | .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB, |
ccd979bd MF |
205 | }; |
206 | ||
ccd979bd | 207 | static struct ocfs2_lock_res_ops ocfs2_inode_data_lops = { |
54a7e755 | 208 | .get_osb = ocfs2_get_inode_osb, |
cc567d89 | 209 | .downconvert_worker = ocfs2_data_convert_worker, |
f625c979 | 210 | .flags = 0, |
ccd979bd MF |
211 | }; |
212 | ||
213 | static struct ocfs2_lock_res_ops ocfs2_super_lops = { | |
f625c979 | 214 | .flags = LOCK_TYPE_REQUIRES_REFRESH, |
ccd979bd MF |
215 | }; |
216 | ||
217 | static struct ocfs2_lock_res_ops ocfs2_rename_lops = { | |
f625c979 | 218 | .flags = 0, |
ccd979bd MF |
219 | }; |
220 | ||
d680efe9 | 221 | static struct ocfs2_lock_res_ops ocfs2_dentry_lops = { |
54a7e755 | 222 | .get_osb = ocfs2_get_dentry_osb, |
d680efe9 | 223 | .post_unlock = ocfs2_dentry_post_unlock, |
cc567d89 | 224 | .downconvert_worker = ocfs2_dentry_convert_worker, |
f625c979 | 225 | .flags = 0, |
d680efe9 MF |
226 | }; |
227 | ||
50008630 TY |
228 | static struct ocfs2_lock_res_ops ocfs2_inode_open_lops = { |
229 | .get_osb = ocfs2_get_inode_osb, | |
230 | .flags = 0, | |
231 | }; | |
232 | ||
ccd979bd MF |
233 | static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres) |
234 | { | |
235 | return lockres->l_type == OCFS2_LOCK_TYPE_META || | |
236 | lockres->l_type == OCFS2_LOCK_TYPE_DATA || | |
50008630 TY |
237 | lockres->l_type == OCFS2_LOCK_TYPE_RW || |
238 | lockres->l_type == OCFS2_LOCK_TYPE_OPEN; | |
ccd979bd MF |
239 | } |
240 | ||
ccd979bd MF |
241 | static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres) |
242 | { | |
243 | BUG_ON(!ocfs2_is_inode_lock(lockres)); | |
244 | ||
245 | return (struct inode *) lockres->l_priv; | |
246 | } | |
247 | ||
d680efe9 MF |
248 | static inline struct ocfs2_dentry_lock *ocfs2_lock_res_dl(struct ocfs2_lock_res *lockres) |
249 | { | |
250 | BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_DENTRY); | |
251 | ||
252 | return (struct ocfs2_dentry_lock *)lockres->l_priv; | |
253 | } | |
254 | ||
54a7e755 MF |
255 | static inline struct ocfs2_super *ocfs2_get_lockres_osb(struct ocfs2_lock_res *lockres) |
256 | { | |
257 | if (lockres->l_ops->get_osb) | |
258 | return lockres->l_ops->get_osb(lockres); | |
259 | ||
260 | return (struct ocfs2_super *)lockres->l_priv; | |
261 | } | |
262 | ||
ccd979bd MF |
263 | static int ocfs2_lock_create(struct ocfs2_super *osb, |
264 | struct ocfs2_lock_res *lockres, | |
265 | int level, | |
266 | int dlm_flags); | |
267 | static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, | |
268 | int wanted); | |
269 | static void ocfs2_cluster_unlock(struct ocfs2_super *osb, | |
270 | struct ocfs2_lock_res *lockres, | |
271 | int level); | |
272 | static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres); | |
273 | static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres); | |
274 | static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres); | |
275 | static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, int level); | |
276 | static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, | |
277 | struct ocfs2_lock_res *lockres); | |
278 | static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, | |
279 | int convert); | |
280 | #define ocfs2_log_dlm_error(_func, _stat, _lockres) do { \ | |
281 | mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \ | |
282 | "resource %s: %s\n", dlm_errname(_stat), _func, \ | |
283 | _lockres->l_name, dlm_errmsg(_stat)); \ | |
284 | } while (0) | |
285 | static void ocfs2_vote_on_unlock(struct ocfs2_super *osb, | |
286 | struct ocfs2_lock_res *lockres); | |
287 | static int ocfs2_meta_lock_update(struct inode *inode, | |
288 | struct buffer_head **bh); | |
289 | static void ocfs2_drop_osb_locks(struct ocfs2_super *osb); | |
290 | static inline int ocfs2_highest_compat_lock_level(int level); | |
ccd979bd | 291 | |
ccd979bd MF |
292 | static void ocfs2_build_lock_name(enum ocfs2_lock_type type, |
293 | u64 blkno, | |
294 | u32 generation, | |
295 | char *name) | |
296 | { | |
297 | int len; | |
298 | ||
299 | mlog_entry_void(); | |
300 | ||
301 | BUG_ON(type >= OCFS2_NUM_LOCK_TYPES); | |
302 | ||
b0697053 MF |
303 | len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016llx%08x", |
304 | ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD, | |
305 | (long long)blkno, generation); | |
ccd979bd MF |
306 | |
307 | BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1)); | |
308 | ||
309 | mlog(0, "built lock resource with name: %s\n", name); | |
310 | ||
311 | mlog_exit_void(); | |
312 | } | |
313 | ||
34af946a | 314 | static DEFINE_SPINLOCK(ocfs2_dlm_tracking_lock); |
ccd979bd MF |
315 | |
316 | static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res, | |
317 | struct ocfs2_dlm_debug *dlm_debug) | |
318 | { | |
319 | mlog(0, "Add tracking for lockres %s\n", res->l_name); | |
320 | ||
321 | spin_lock(&ocfs2_dlm_tracking_lock); | |
322 | list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking); | |
323 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
324 | } | |
325 | ||
326 | static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res) | |
327 | { | |
328 | spin_lock(&ocfs2_dlm_tracking_lock); | |
329 | if (!list_empty(&res->l_debug_list)) | |
330 | list_del_init(&res->l_debug_list); | |
331 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
332 | } | |
333 | ||
334 | static void ocfs2_lock_res_init_common(struct ocfs2_super *osb, | |
335 | struct ocfs2_lock_res *res, | |
336 | enum ocfs2_lock_type type, | |
ccd979bd MF |
337 | struct ocfs2_lock_res_ops *ops, |
338 | void *priv) | |
339 | { | |
ccd979bd MF |
340 | res->l_type = type; |
341 | res->l_ops = ops; | |
342 | res->l_priv = priv; | |
343 | ||
344 | res->l_level = LKM_IVMODE; | |
345 | res->l_requested = LKM_IVMODE; | |
346 | res->l_blocking = LKM_IVMODE; | |
347 | res->l_action = OCFS2_AST_INVALID; | |
348 | res->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
349 | ||
350 | res->l_flags = OCFS2_LOCK_INITIALIZED; | |
351 | ||
352 | ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug); | |
353 | } | |
354 | ||
355 | void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res) | |
356 | { | |
357 | /* This also clears out the lock status block */ | |
358 | memset(res, 0, sizeof(struct ocfs2_lock_res)); | |
359 | spin_lock_init(&res->l_lock); | |
360 | init_waitqueue_head(&res->l_event); | |
361 | INIT_LIST_HEAD(&res->l_blocked_list); | |
362 | INIT_LIST_HEAD(&res->l_mask_waiters); | |
363 | } | |
364 | ||
365 | void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res, | |
366 | enum ocfs2_lock_type type, | |
24c19ef4 | 367 | unsigned int generation, |
ccd979bd MF |
368 | struct inode *inode) |
369 | { | |
370 | struct ocfs2_lock_res_ops *ops; | |
371 | ||
372 | switch(type) { | |
373 | case OCFS2_LOCK_TYPE_RW: | |
374 | ops = &ocfs2_inode_rw_lops; | |
375 | break; | |
376 | case OCFS2_LOCK_TYPE_META: | |
377 | ops = &ocfs2_inode_meta_lops; | |
378 | break; | |
379 | case OCFS2_LOCK_TYPE_DATA: | |
380 | ops = &ocfs2_inode_data_lops; | |
381 | break; | |
50008630 TY |
382 | case OCFS2_LOCK_TYPE_OPEN: |
383 | ops = &ocfs2_inode_open_lops; | |
384 | break; | |
ccd979bd MF |
385 | default: |
386 | mlog_bug_on_msg(1, "type: %d\n", type); | |
387 | ops = NULL; /* thanks, gcc */ | |
388 | break; | |
389 | }; | |
390 | ||
d680efe9 | 391 | ocfs2_build_lock_name(type, OCFS2_I(inode)->ip_blkno, |
24c19ef4 | 392 | generation, res->l_name); |
d680efe9 MF |
393 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type, ops, inode); |
394 | } | |
395 | ||
54a7e755 MF |
396 | static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres) |
397 | { | |
398 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
399 | ||
400 | return OCFS2_SB(inode->i_sb); | |
401 | } | |
402 | ||
d680efe9 MF |
403 | static __u64 ocfs2_get_dentry_lock_ino(struct ocfs2_lock_res *lockres) |
404 | { | |
405 | __be64 inode_blkno_be; | |
406 | ||
407 | memcpy(&inode_blkno_be, &lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], | |
408 | sizeof(__be64)); | |
409 | ||
410 | return be64_to_cpu(inode_blkno_be); | |
411 | } | |
412 | ||
54a7e755 MF |
413 | static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres) |
414 | { | |
415 | struct ocfs2_dentry_lock *dl = lockres->l_priv; | |
416 | ||
417 | return OCFS2_SB(dl->dl_inode->i_sb); | |
418 | } | |
419 | ||
d680efe9 MF |
420 | void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl, |
421 | u64 parent, struct inode *inode) | |
422 | { | |
423 | int len; | |
424 | u64 inode_blkno = OCFS2_I(inode)->ip_blkno; | |
425 | __be64 inode_blkno_be = cpu_to_be64(inode_blkno); | |
426 | struct ocfs2_lock_res *lockres = &dl->dl_lockres; | |
427 | ||
428 | ocfs2_lock_res_init_once(lockres); | |
429 | ||
430 | /* | |
431 | * Unfortunately, the standard lock naming scheme won't work | |
432 | * here because we have two 16 byte values to use. Instead, | |
433 | * we'll stuff the inode number as a binary value. We still | |
434 | * want error prints to show something without garbling the | |
435 | * display, so drop a null byte in there before the inode | |
436 | * number. A future version of OCFS2 will likely use all | |
437 | * binary lock names. The stringified names have been a | |
438 | * tremendous aid in debugging, but now that the debugfs | |
439 | * interface exists, we can mangle things there if need be. | |
440 | * | |
441 | * NOTE: We also drop the standard "pad" value (the total lock | |
442 | * name size stays the same though - the last part is all | |
443 | * zeros due to the memset in ocfs2_lock_res_init_once() | |
444 | */ | |
445 | len = snprintf(lockres->l_name, OCFS2_DENTRY_LOCK_INO_START, | |
446 | "%c%016llx", | |
447 | ocfs2_lock_type_char(OCFS2_LOCK_TYPE_DENTRY), | |
448 | (long long)parent); | |
449 | ||
450 | BUG_ON(len != (OCFS2_DENTRY_LOCK_INO_START - 1)); | |
451 | ||
452 | memcpy(&lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], &inode_blkno_be, | |
453 | sizeof(__be64)); | |
454 | ||
455 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres, | |
456 | OCFS2_LOCK_TYPE_DENTRY, &ocfs2_dentry_lops, | |
457 | dl); | |
ccd979bd MF |
458 | } |
459 | ||
460 | static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res, | |
461 | struct ocfs2_super *osb) | |
462 | { | |
463 | /* Superblock lockres doesn't come from a slab so we call init | |
464 | * once on it manually. */ | |
465 | ocfs2_lock_res_init_once(res); | |
d680efe9 MF |
466 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_SUPER, OCFS2_SUPER_BLOCK_BLKNO, |
467 | 0, res->l_name); | |
ccd979bd | 468 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER, |
ccd979bd MF |
469 | &ocfs2_super_lops, osb); |
470 | } | |
471 | ||
472 | static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res, | |
473 | struct ocfs2_super *osb) | |
474 | { | |
475 | /* Rename lockres doesn't come from a slab so we call init | |
476 | * once on it manually. */ | |
477 | ocfs2_lock_res_init_once(res); | |
d680efe9 MF |
478 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_RENAME, 0, 0, res->l_name); |
479 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME, | |
ccd979bd MF |
480 | &ocfs2_rename_lops, osb); |
481 | } | |
482 | ||
483 | void ocfs2_lock_res_free(struct ocfs2_lock_res *res) | |
484 | { | |
485 | mlog_entry_void(); | |
486 | ||
487 | if (!(res->l_flags & OCFS2_LOCK_INITIALIZED)) | |
488 | return; | |
489 | ||
490 | ocfs2_remove_lockres_tracking(res); | |
491 | ||
492 | mlog_bug_on_msg(!list_empty(&res->l_blocked_list), | |
493 | "Lockres %s is on the blocked list\n", | |
494 | res->l_name); | |
495 | mlog_bug_on_msg(!list_empty(&res->l_mask_waiters), | |
496 | "Lockres %s has mask waiters pending\n", | |
497 | res->l_name); | |
498 | mlog_bug_on_msg(spin_is_locked(&res->l_lock), | |
499 | "Lockres %s is locked\n", | |
500 | res->l_name); | |
501 | mlog_bug_on_msg(res->l_ro_holders, | |
502 | "Lockres %s has %u ro holders\n", | |
503 | res->l_name, res->l_ro_holders); | |
504 | mlog_bug_on_msg(res->l_ex_holders, | |
505 | "Lockres %s has %u ex holders\n", | |
506 | res->l_name, res->l_ex_holders); | |
507 | ||
508 | /* Need to clear out the lock status block for the dlm */ | |
509 | memset(&res->l_lksb, 0, sizeof(res->l_lksb)); | |
510 | ||
511 | res->l_flags = 0UL; | |
512 | mlog_exit_void(); | |
513 | } | |
514 | ||
515 | static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres, | |
516 | int level) | |
517 | { | |
518 | mlog_entry_void(); | |
519 | ||
520 | BUG_ON(!lockres); | |
521 | ||
522 | switch(level) { | |
523 | case LKM_EXMODE: | |
524 | lockres->l_ex_holders++; | |
525 | break; | |
526 | case LKM_PRMODE: | |
527 | lockres->l_ro_holders++; | |
528 | break; | |
529 | default: | |
530 | BUG(); | |
531 | } | |
532 | ||
533 | mlog_exit_void(); | |
534 | } | |
535 | ||
536 | static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres, | |
537 | int level) | |
538 | { | |
539 | mlog_entry_void(); | |
540 | ||
541 | BUG_ON(!lockres); | |
542 | ||
543 | switch(level) { | |
544 | case LKM_EXMODE: | |
545 | BUG_ON(!lockres->l_ex_holders); | |
546 | lockres->l_ex_holders--; | |
547 | break; | |
548 | case LKM_PRMODE: | |
549 | BUG_ON(!lockres->l_ro_holders); | |
550 | lockres->l_ro_holders--; | |
551 | break; | |
552 | default: | |
553 | BUG(); | |
554 | } | |
555 | mlog_exit_void(); | |
556 | } | |
557 | ||
558 | /* WARNING: This function lives in a world where the only three lock | |
559 | * levels are EX, PR, and NL. It *will* have to be adjusted when more | |
560 | * lock types are added. */ | |
561 | static inline int ocfs2_highest_compat_lock_level(int level) | |
562 | { | |
563 | int new_level = LKM_EXMODE; | |
564 | ||
565 | if (level == LKM_EXMODE) | |
566 | new_level = LKM_NLMODE; | |
567 | else if (level == LKM_PRMODE) | |
568 | new_level = LKM_PRMODE; | |
569 | return new_level; | |
570 | } | |
571 | ||
572 | static void lockres_set_flags(struct ocfs2_lock_res *lockres, | |
573 | unsigned long newflags) | |
574 | { | |
575 | struct list_head *pos, *tmp; | |
576 | struct ocfs2_mask_waiter *mw; | |
577 | ||
578 | assert_spin_locked(&lockres->l_lock); | |
579 | ||
580 | lockres->l_flags = newflags; | |
581 | ||
582 | list_for_each_safe(pos, tmp, &lockres->l_mask_waiters) { | |
583 | mw = list_entry(pos, struct ocfs2_mask_waiter, mw_item); | |
584 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) | |
585 | continue; | |
586 | ||
587 | list_del_init(&mw->mw_item); | |
588 | mw->mw_status = 0; | |
589 | complete(&mw->mw_complete); | |
590 | } | |
591 | } | |
592 | static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or) | |
593 | { | |
594 | lockres_set_flags(lockres, lockres->l_flags | or); | |
595 | } | |
596 | static void lockres_clear_flags(struct ocfs2_lock_res *lockres, | |
597 | unsigned long clear) | |
598 | { | |
599 | lockres_set_flags(lockres, lockres->l_flags & ~clear); | |
600 | } | |
601 | ||
602 | static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres) | |
603 | { | |
604 | mlog_entry_void(); | |
605 | ||
606 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); | |
607 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); | |
608 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
609 | BUG_ON(lockres->l_blocking <= LKM_NLMODE); | |
610 | ||
611 | lockres->l_level = lockres->l_requested; | |
612 | if (lockres->l_level <= | |
613 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) { | |
614 | lockres->l_blocking = LKM_NLMODE; | |
615 | lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED); | |
616 | } | |
617 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
618 | ||
619 | mlog_exit_void(); | |
620 | } | |
621 | ||
622 | static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres) | |
623 | { | |
624 | mlog_entry_void(); | |
625 | ||
626 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); | |
627 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); | |
628 | ||
629 | /* Convert from RO to EX doesn't really need anything as our | |
630 | * information is already up to data. Convert from NL to | |
631 | * *anything* however should mark ourselves as needing an | |
632 | * update */ | |
f625c979 MF |
633 | if (lockres->l_level == LKM_NLMODE && |
634 | lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) | |
ccd979bd MF |
635 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
636 | ||
637 | lockres->l_level = lockres->l_requested; | |
638 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
639 | ||
640 | mlog_exit_void(); | |
641 | } | |
642 | ||
643 | static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres) | |
644 | { | |
645 | mlog_entry_void(); | |
646 | ||
647 | BUG_ON((!lockres->l_flags & OCFS2_LOCK_BUSY)); | |
648 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); | |
649 | ||
650 | if (lockres->l_requested > LKM_NLMODE && | |
f625c979 MF |
651 | !(lockres->l_flags & OCFS2_LOCK_LOCAL) && |
652 | lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) | |
ccd979bd MF |
653 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
654 | ||
655 | lockres->l_level = lockres->l_requested; | |
656 | lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED); | |
657 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
658 | ||
659 | mlog_exit_void(); | |
660 | } | |
661 | ||
ccd979bd MF |
662 | static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, |
663 | int level) | |
664 | { | |
665 | int needs_downconvert = 0; | |
666 | mlog_entry_void(); | |
667 | ||
668 | assert_spin_locked(&lockres->l_lock); | |
669 | ||
670 | lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); | |
671 | ||
672 | if (level > lockres->l_blocking) { | |
673 | /* only schedule a downconvert if we haven't already scheduled | |
674 | * one that goes low enough to satisfy the level we're | |
675 | * blocking. this also catches the case where we get | |
676 | * duplicate BASTs */ | |
677 | if (ocfs2_highest_compat_lock_level(level) < | |
678 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) | |
679 | needs_downconvert = 1; | |
680 | ||
681 | lockres->l_blocking = level; | |
682 | } | |
683 | ||
684 | mlog_exit(needs_downconvert); | |
685 | return needs_downconvert; | |
686 | } | |
687 | ||
aa2623ad | 688 | static void ocfs2_blocking_ast(void *opaque, int level) |
ccd979bd | 689 | { |
aa2623ad MF |
690 | struct ocfs2_lock_res *lockres = opaque; |
691 | struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); | |
ccd979bd MF |
692 | int needs_downconvert; |
693 | unsigned long flags; | |
694 | ||
ccd979bd MF |
695 | BUG_ON(level <= LKM_NLMODE); |
696 | ||
aa2623ad MF |
697 | mlog(0, "BAST fired for lockres %s, blocking %d, level %d type %s\n", |
698 | lockres->l_name, level, lockres->l_level, | |
699 | ocfs2_lock_type_string(lockres->l_type)); | |
700 | ||
ccd979bd MF |
701 | spin_lock_irqsave(&lockres->l_lock, flags); |
702 | needs_downconvert = ocfs2_generic_handle_bast(lockres, level); | |
703 | if (needs_downconvert) | |
704 | ocfs2_schedule_blocked_lock(osb, lockres); | |
705 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
706 | ||
d680efe9 MF |
707 | wake_up(&lockres->l_event); |
708 | ||
ccd979bd | 709 | ocfs2_kick_vote_thread(osb); |
ccd979bd MF |
710 | } |
711 | ||
e92d57df | 712 | static void ocfs2_locking_ast(void *opaque) |
ccd979bd | 713 | { |
e92d57df | 714 | struct ocfs2_lock_res *lockres = opaque; |
ccd979bd MF |
715 | struct dlm_lockstatus *lksb = &lockres->l_lksb; |
716 | unsigned long flags; | |
717 | ||
718 | spin_lock_irqsave(&lockres->l_lock, flags); | |
719 | ||
720 | if (lksb->status != DLM_NORMAL) { | |
721 | mlog(ML_ERROR, "lockres %s: lksb status value of %u!\n", | |
722 | lockres->l_name, lksb->status); | |
723 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
724 | return; | |
725 | } | |
726 | ||
727 | switch(lockres->l_action) { | |
728 | case OCFS2_AST_ATTACH: | |
729 | ocfs2_generic_handle_attach_action(lockres); | |
e92d57df | 730 | lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL); |
ccd979bd MF |
731 | break; |
732 | case OCFS2_AST_CONVERT: | |
733 | ocfs2_generic_handle_convert_action(lockres); | |
734 | break; | |
735 | case OCFS2_AST_DOWNCONVERT: | |
736 | ocfs2_generic_handle_downconvert_action(lockres); | |
737 | break; | |
738 | default: | |
e92d57df MF |
739 | mlog(ML_ERROR, "lockres %s: ast fired with invalid action: %u " |
740 | "lockres flags = 0x%lx, unlock action: %u\n", | |
741 | lockres->l_name, lockres->l_action, lockres->l_flags, | |
742 | lockres->l_unlock_action); | |
ccd979bd MF |
743 | BUG(); |
744 | } | |
745 | ||
ccd979bd MF |
746 | /* set it to something invalid so if we get called again we |
747 | * can catch it. */ | |
748 | lockres->l_action = OCFS2_AST_INVALID; | |
ccd979bd MF |
749 | |
750 | wake_up(&lockres->l_event); | |
d680efe9 | 751 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
ccd979bd MF |
752 | } |
753 | ||
ccd979bd MF |
754 | static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, |
755 | int convert) | |
756 | { | |
757 | unsigned long flags; | |
758 | ||
759 | mlog_entry_void(); | |
760 | spin_lock_irqsave(&lockres->l_lock, flags); | |
761 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
762 | if (convert) | |
763 | lockres->l_action = OCFS2_AST_INVALID; | |
764 | else | |
765 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
766 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
767 | ||
768 | wake_up(&lockres->l_event); | |
769 | mlog_exit_void(); | |
770 | } | |
771 | ||
772 | /* Note: If we detect another process working on the lock (i.e., | |
773 | * OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller | |
774 | * to do the right thing in that case. | |
775 | */ | |
776 | static int ocfs2_lock_create(struct ocfs2_super *osb, | |
777 | struct ocfs2_lock_res *lockres, | |
778 | int level, | |
779 | int dlm_flags) | |
780 | { | |
781 | int ret = 0; | |
c271c5c2 | 782 | enum dlm_status status = DLM_NORMAL; |
ccd979bd MF |
783 | unsigned long flags; |
784 | ||
785 | mlog_entry_void(); | |
786 | ||
787 | mlog(0, "lock %s, level = %d, flags = %d\n", lockres->l_name, level, | |
788 | dlm_flags); | |
789 | ||
790 | spin_lock_irqsave(&lockres->l_lock, flags); | |
791 | if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) || | |
792 | (lockres->l_flags & OCFS2_LOCK_BUSY)) { | |
793 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
794 | goto bail; | |
795 | } | |
796 | ||
797 | lockres->l_action = OCFS2_AST_ATTACH; | |
798 | lockres->l_requested = level; | |
799 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
800 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
801 | ||
802 | status = dlmlock(osb->dlm, | |
803 | level, | |
804 | &lockres->l_lksb, | |
805 | dlm_flags, | |
806 | lockres->l_name, | |
f0681062 | 807 | OCFS2_LOCK_ID_MAX_LEN - 1, |
e92d57df | 808 | ocfs2_locking_ast, |
ccd979bd | 809 | lockres, |
aa2623ad | 810 | ocfs2_blocking_ast); |
ccd979bd MF |
811 | if (status != DLM_NORMAL) { |
812 | ocfs2_log_dlm_error("dlmlock", status, lockres); | |
813 | ret = -EINVAL; | |
814 | ocfs2_recover_from_dlm_error(lockres, 1); | |
815 | } | |
816 | ||
817 | mlog(0, "lock %s, successfull return from dlmlock\n", lockres->l_name); | |
818 | ||
819 | bail: | |
820 | mlog_exit(ret); | |
821 | return ret; | |
822 | } | |
823 | ||
824 | static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres, | |
825 | int flag) | |
826 | { | |
827 | unsigned long flags; | |
828 | int ret; | |
829 | ||
830 | spin_lock_irqsave(&lockres->l_lock, flags); | |
831 | ret = lockres->l_flags & flag; | |
832 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
833 | ||
834 | return ret; | |
835 | } | |
836 | ||
837 | static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres) | |
838 | ||
839 | { | |
840 | wait_event(lockres->l_event, | |
841 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY)); | |
842 | } | |
843 | ||
844 | static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres) | |
845 | ||
846 | { | |
847 | wait_event(lockres->l_event, | |
848 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING)); | |
849 | } | |
850 | ||
851 | /* predict what lock level we'll be dropping down to on behalf | |
852 | * of another node, and return true if the currently wanted | |
853 | * level will be compatible with it. */ | |
854 | static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, | |
855 | int wanted) | |
856 | { | |
857 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
858 | ||
859 | return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking); | |
860 | } | |
861 | ||
862 | static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw) | |
863 | { | |
864 | INIT_LIST_HEAD(&mw->mw_item); | |
865 | init_completion(&mw->mw_complete); | |
866 | } | |
867 | ||
868 | static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw) | |
869 | { | |
870 | wait_for_completion(&mw->mw_complete); | |
871 | /* Re-arm the completion in case we want to wait on it again */ | |
872 | INIT_COMPLETION(mw->mw_complete); | |
873 | return mw->mw_status; | |
874 | } | |
875 | ||
876 | static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres, | |
877 | struct ocfs2_mask_waiter *mw, | |
878 | unsigned long mask, | |
879 | unsigned long goal) | |
880 | { | |
881 | BUG_ON(!list_empty(&mw->mw_item)); | |
882 | ||
883 | assert_spin_locked(&lockres->l_lock); | |
884 | ||
885 | list_add_tail(&mw->mw_item, &lockres->l_mask_waiters); | |
886 | mw->mw_mask = mask; | |
887 | mw->mw_goal = goal; | |
888 | } | |
889 | ||
890 | /* returns 0 if the mw that was removed was already satisfied, -EBUSY | |
891 | * if the mask still hadn't reached its goal */ | |
892 | static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres, | |
893 | struct ocfs2_mask_waiter *mw) | |
894 | { | |
895 | unsigned long flags; | |
896 | int ret = 0; | |
897 | ||
898 | spin_lock_irqsave(&lockres->l_lock, flags); | |
899 | if (!list_empty(&mw->mw_item)) { | |
900 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) | |
901 | ret = -EBUSY; | |
902 | ||
903 | list_del_init(&mw->mw_item); | |
904 | init_completion(&mw->mw_complete); | |
905 | } | |
906 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
907 | ||
908 | return ret; | |
909 | ||
910 | } | |
911 | ||
912 | static int ocfs2_cluster_lock(struct ocfs2_super *osb, | |
913 | struct ocfs2_lock_res *lockres, | |
914 | int level, | |
915 | int lkm_flags, | |
916 | int arg_flags) | |
917 | { | |
918 | struct ocfs2_mask_waiter mw; | |
919 | enum dlm_status status; | |
920 | int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR); | |
921 | int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */ | |
922 | unsigned long flags; | |
923 | ||
924 | mlog_entry_void(); | |
925 | ||
926 | ocfs2_init_mask_waiter(&mw); | |
927 | ||
b80fc012 MF |
928 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
929 | lkm_flags |= LKM_VALBLK; | |
930 | ||
ccd979bd MF |
931 | again: |
932 | wait = 0; | |
933 | ||
934 | if (catch_signals && signal_pending(current)) { | |
935 | ret = -ERESTARTSYS; | |
936 | goto out; | |
937 | } | |
938 | ||
939 | spin_lock_irqsave(&lockres->l_lock, flags); | |
940 | ||
941 | mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING, | |
942 | "Cluster lock called on freeing lockres %s! flags " | |
943 | "0x%lx\n", lockres->l_name, lockres->l_flags); | |
944 | ||
945 | /* We only compare against the currently granted level | |
946 | * here. If the lock is blocked waiting on a downconvert, | |
947 | * we'll get caught below. */ | |
948 | if (lockres->l_flags & OCFS2_LOCK_BUSY && | |
949 | level > lockres->l_level) { | |
950 | /* is someone sitting in dlm_lock? If so, wait on | |
951 | * them. */ | |
952 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
953 | wait = 1; | |
954 | goto unlock; | |
955 | } | |
956 | ||
957 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { | |
958 | /* lock has not been created yet. */ | |
959 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
960 | ||
961 | ret = ocfs2_lock_create(osb, lockres, LKM_NLMODE, 0); | |
962 | if (ret < 0) { | |
963 | mlog_errno(ret); | |
964 | goto out; | |
965 | } | |
966 | goto again; | |
967 | } | |
968 | ||
969 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED && | |
970 | !ocfs2_may_continue_on_blocked_lock(lockres, level)) { | |
971 | /* is the lock is currently blocked on behalf of | |
972 | * another node */ | |
973 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0); | |
974 | wait = 1; | |
975 | goto unlock; | |
976 | } | |
977 | ||
978 | if (level > lockres->l_level) { | |
979 | if (lockres->l_action != OCFS2_AST_INVALID) | |
980 | mlog(ML_ERROR, "lockres %s has action %u pending\n", | |
981 | lockres->l_name, lockres->l_action); | |
982 | ||
983 | lockres->l_action = OCFS2_AST_CONVERT; | |
984 | lockres->l_requested = level; | |
985 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
986 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
987 | ||
988 | BUG_ON(level == LKM_IVMODE); | |
989 | BUG_ON(level == LKM_NLMODE); | |
990 | ||
991 | mlog(0, "lock %s, convert from %d to level = %d\n", | |
992 | lockres->l_name, lockres->l_level, level); | |
993 | ||
994 | /* call dlm_lock to upgrade lock now */ | |
995 | status = dlmlock(osb->dlm, | |
996 | level, | |
997 | &lockres->l_lksb, | |
b80fc012 | 998 | lkm_flags|LKM_CONVERT, |
ccd979bd | 999 | lockres->l_name, |
f0681062 | 1000 | OCFS2_LOCK_ID_MAX_LEN - 1, |
e92d57df | 1001 | ocfs2_locking_ast, |
ccd979bd | 1002 | lockres, |
aa2623ad | 1003 | ocfs2_blocking_ast); |
ccd979bd MF |
1004 | if (status != DLM_NORMAL) { |
1005 | if ((lkm_flags & LKM_NOQUEUE) && | |
1006 | (status == DLM_NOTQUEUED)) | |
1007 | ret = -EAGAIN; | |
1008 | else { | |
1009 | ocfs2_log_dlm_error("dlmlock", status, | |
1010 | lockres); | |
1011 | ret = -EINVAL; | |
1012 | } | |
1013 | ocfs2_recover_from_dlm_error(lockres, 1); | |
1014 | goto out; | |
1015 | } | |
1016 | ||
1017 | mlog(0, "lock %s, successfull return from dlmlock\n", | |
1018 | lockres->l_name); | |
1019 | ||
1020 | /* At this point we've gone inside the dlm and need to | |
1021 | * complete our work regardless. */ | |
1022 | catch_signals = 0; | |
1023 | ||
1024 | /* wait for busy to clear and carry on */ | |
1025 | goto again; | |
1026 | } | |
1027 | ||
1028 | /* Ok, if we get here then we're good to go. */ | |
1029 | ocfs2_inc_holders(lockres, level); | |
1030 | ||
1031 | ret = 0; | |
1032 | unlock: | |
1033 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1034 | out: | |
1035 | /* | |
1036 | * This is helping work around a lock inversion between the page lock | |
1037 | * and dlm locks. One path holds the page lock while calling aops | |
1038 | * which block acquiring dlm locks. The voting thread holds dlm | |
1039 | * locks while acquiring page locks while down converting data locks. | |
1040 | * This block is helping an aop path notice the inversion and back | |
1041 | * off to unlock its page lock before trying the dlm lock again. | |
1042 | */ | |
1043 | if (wait && arg_flags & OCFS2_LOCK_NONBLOCK && | |
1044 | mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) { | |
1045 | wait = 0; | |
1046 | if (lockres_remove_mask_waiter(lockres, &mw)) | |
1047 | ret = -EAGAIN; | |
1048 | else | |
1049 | goto again; | |
1050 | } | |
1051 | if (wait) { | |
1052 | ret = ocfs2_wait_for_mask(&mw); | |
1053 | if (ret == 0) | |
1054 | goto again; | |
1055 | mlog_errno(ret); | |
1056 | } | |
1057 | ||
1058 | mlog_exit(ret); | |
1059 | return ret; | |
1060 | } | |
1061 | ||
1062 | static void ocfs2_cluster_unlock(struct ocfs2_super *osb, | |
1063 | struct ocfs2_lock_res *lockres, | |
1064 | int level) | |
1065 | { | |
1066 | unsigned long flags; | |
1067 | ||
1068 | mlog_entry_void(); | |
1069 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1070 | ocfs2_dec_holders(lockres, level); | |
1071 | ocfs2_vote_on_unlock(osb, lockres); | |
1072 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1073 | mlog_exit_void(); | |
1074 | } | |
1075 | ||
da66116e AB |
1076 | static int ocfs2_create_new_lock(struct ocfs2_super *osb, |
1077 | struct ocfs2_lock_res *lockres, | |
1078 | int ex, | |
1079 | int local) | |
ccd979bd | 1080 | { |
d680efe9 | 1081 | int level = ex ? LKM_EXMODE : LKM_PRMODE; |
ccd979bd | 1082 | unsigned long flags; |
24c19ef4 | 1083 | int lkm_flags = local ? LKM_LOCAL : 0; |
ccd979bd MF |
1084 | |
1085 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1086 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); | |
1087 | lockres_or_flags(lockres, OCFS2_LOCK_LOCAL); | |
1088 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1089 | ||
24c19ef4 | 1090 | return ocfs2_lock_create(osb, lockres, level, lkm_flags); |
ccd979bd MF |
1091 | } |
1092 | ||
1093 | /* Grants us an EX lock on the data and metadata resources, skipping | |
1094 | * the normal cluster directory lookup. Use this ONLY on newly created | |
1095 | * inodes which other nodes can't possibly see, and which haven't been | |
1096 | * hashed in the inode hash yet. This can give us a good performance | |
1097 | * increase as it'll skip the network broadcast normally associated | |
1098 | * with creating a new lock resource. */ | |
1099 | int ocfs2_create_new_inode_locks(struct inode *inode) | |
1100 | { | |
1101 | int ret; | |
d680efe9 | 1102 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
1103 | |
1104 | BUG_ON(!inode); | |
1105 | BUG_ON(!ocfs2_inode_is_new(inode)); | |
1106 | ||
1107 | mlog_entry_void(); | |
1108 | ||
b0697053 | 1109 | mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno); |
ccd979bd MF |
1110 | |
1111 | /* NOTE: That we don't increment any of the holder counts, nor | |
1112 | * do we add anything to a journal handle. Since this is | |
1113 | * supposed to be a new inode which the cluster doesn't know | |
1114 | * about yet, there is no need to. As far as the LVB handling | |
1115 | * is concerned, this is basically like acquiring an EX lock | |
1116 | * on a resource which has an invalid one -- we'll set it | |
1117 | * valid when we release the EX. */ | |
1118 | ||
24c19ef4 | 1119 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_rw_lockres, 1, 1); |
ccd979bd MF |
1120 | if (ret) { |
1121 | mlog_errno(ret); | |
1122 | goto bail; | |
1123 | } | |
1124 | ||
24c19ef4 MF |
1125 | /* |
1126 | * We don't want to use LKM_LOCAL on a meta data lock as they | |
1127 | * don't use a generation in their lock names. | |
1128 | */ | |
1129 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_meta_lockres, 1, 0); | |
ccd979bd MF |
1130 | if (ret) { |
1131 | mlog_errno(ret); | |
1132 | goto bail; | |
1133 | } | |
1134 | ||
24c19ef4 | 1135 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_data_lockres, 1, 1); |
ccd979bd MF |
1136 | if (ret) { |
1137 | mlog_errno(ret); | |
1138 | goto bail; | |
1139 | } | |
1140 | ||
50008630 TY |
1141 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_open_lockres, 0, 0); |
1142 | if (ret) { | |
1143 | mlog_errno(ret); | |
1144 | goto bail; | |
1145 | } | |
1146 | ||
ccd979bd MF |
1147 | bail: |
1148 | mlog_exit(ret); | |
1149 | return ret; | |
1150 | } | |
1151 | ||
1152 | int ocfs2_rw_lock(struct inode *inode, int write) | |
1153 | { | |
1154 | int status, level; | |
1155 | struct ocfs2_lock_res *lockres; | |
c271c5c2 | 1156 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
1157 | |
1158 | BUG_ON(!inode); | |
1159 | ||
1160 | mlog_entry_void(); | |
1161 | ||
b0697053 MF |
1162 | mlog(0, "inode %llu take %s RW lock\n", |
1163 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1164 | write ? "EXMODE" : "PRMODE"); |
1165 | ||
c271c5c2 SM |
1166 | if (ocfs2_mount_local(osb)) |
1167 | return 0; | |
1168 | ||
ccd979bd MF |
1169 | lockres = &OCFS2_I(inode)->ip_rw_lockres; |
1170 | ||
1171 | level = write ? LKM_EXMODE : LKM_PRMODE; | |
1172 | ||
1173 | status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, 0, | |
1174 | 0); | |
1175 | if (status < 0) | |
1176 | mlog_errno(status); | |
1177 | ||
1178 | mlog_exit(status); | |
1179 | return status; | |
1180 | } | |
1181 | ||
1182 | void ocfs2_rw_unlock(struct inode *inode, int write) | |
1183 | { | |
1184 | int level = write ? LKM_EXMODE : LKM_PRMODE; | |
1185 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres; | |
c271c5c2 | 1186 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
1187 | |
1188 | mlog_entry_void(); | |
1189 | ||
b0697053 MF |
1190 | mlog(0, "inode %llu drop %s RW lock\n", |
1191 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1192 | write ? "EXMODE" : "PRMODE"); |
1193 | ||
c271c5c2 SM |
1194 | if (!ocfs2_mount_local(osb)) |
1195 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); | |
ccd979bd MF |
1196 | |
1197 | mlog_exit_void(); | |
1198 | } | |
1199 | ||
50008630 TY |
1200 | /* |
1201 | * ocfs2_open_lock always get PR mode lock. | |
1202 | */ | |
1203 | int ocfs2_open_lock(struct inode *inode) | |
1204 | { | |
1205 | int status = 0; | |
1206 | struct ocfs2_lock_res *lockres; | |
1207 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1208 | ||
1209 | BUG_ON(!inode); | |
1210 | ||
1211 | mlog_entry_void(); | |
1212 | ||
1213 | mlog(0, "inode %llu take PRMODE open lock\n", | |
1214 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
1215 | ||
1216 | if (ocfs2_mount_local(osb)) | |
1217 | goto out; | |
1218 | ||
1219 | lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1220 | ||
1221 | status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, | |
1222 | LKM_PRMODE, 0, 0); | |
1223 | if (status < 0) | |
1224 | mlog_errno(status); | |
1225 | ||
1226 | out: | |
1227 | mlog_exit(status); | |
1228 | return status; | |
1229 | } | |
1230 | ||
1231 | int ocfs2_try_open_lock(struct inode *inode, int write) | |
1232 | { | |
1233 | int status = 0, level; | |
1234 | struct ocfs2_lock_res *lockres; | |
1235 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1236 | ||
1237 | BUG_ON(!inode); | |
1238 | ||
1239 | mlog_entry_void(); | |
1240 | ||
1241 | mlog(0, "inode %llu try to take %s open lock\n", | |
1242 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
1243 | write ? "EXMODE" : "PRMODE"); | |
1244 | ||
1245 | if (ocfs2_mount_local(osb)) | |
1246 | goto out; | |
1247 | ||
1248 | lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1249 | ||
1250 | level = write ? LKM_EXMODE : LKM_PRMODE; | |
1251 | ||
1252 | /* | |
1253 | * The file system may already holding a PRMODE/EXMODE open lock. | |
1254 | * Since we pass LKM_NOQUEUE, the request won't block waiting on | |
1255 | * other nodes and the -EAGAIN will indicate to the caller that | |
1256 | * this inode is still in use. | |
1257 | */ | |
1258 | status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, | |
1259 | level, LKM_NOQUEUE, 0); | |
1260 | ||
1261 | out: | |
1262 | mlog_exit(status); | |
1263 | return status; | |
1264 | } | |
1265 | ||
1266 | /* | |
1267 | * ocfs2_open_unlock unlock PR and EX mode open locks. | |
1268 | */ | |
1269 | void ocfs2_open_unlock(struct inode *inode) | |
1270 | { | |
1271 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1272 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1273 | ||
1274 | mlog_entry_void(); | |
1275 | ||
1276 | mlog(0, "inode %llu drop open lock\n", | |
1277 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
1278 | ||
1279 | if (ocfs2_mount_local(osb)) | |
1280 | goto out; | |
1281 | ||
1282 | if(lockres->l_ro_holders) | |
1283 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, | |
1284 | LKM_PRMODE); | |
1285 | if(lockres->l_ex_holders) | |
1286 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, | |
1287 | LKM_EXMODE); | |
1288 | ||
1289 | out: | |
1290 | mlog_exit_void(); | |
1291 | } | |
1292 | ||
ccd979bd MF |
1293 | int ocfs2_data_lock_full(struct inode *inode, |
1294 | int write, | |
1295 | int arg_flags) | |
1296 | { | |
1297 | int status = 0, level; | |
1298 | struct ocfs2_lock_res *lockres; | |
c271c5c2 | 1299 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
1300 | |
1301 | BUG_ON(!inode); | |
1302 | ||
1303 | mlog_entry_void(); | |
1304 | ||
b0697053 MF |
1305 | mlog(0, "inode %llu take %s DATA lock\n", |
1306 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1307 | write ? "EXMODE" : "PRMODE"); |
1308 | ||
1309 | /* We'll allow faking a readonly data lock for | |
1310 | * rodevices. */ | |
1311 | if (ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) { | |
1312 | if (write) { | |
1313 | status = -EROFS; | |
1314 | mlog_errno(status); | |
1315 | } | |
1316 | goto out; | |
1317 | } | |
1318 | ||
c271c5c2 SM |
1319 | if (ocfs2_mount_local(osb)) |
1320 | goto out; | |
1321 | ||
ccd979bd MF |
1322 | lockres = &OCFS2_I(inode)->ip_data_lockres; |
1323 | ||
1324 | level = write ? LKM_EXMODE : LKM_PRMODE; | |
1325 | ||
1326 | status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, | |
1327 | 0, arg_flags); | |
1328 | if (status < 0 && status != -EAGAIN) | |
1329 | mlog_errno(status); | |
1330 | ||
1331 | out: | |
1332 | mlog_exit(status); | |
1333 | return status; | |
1334 | } | |
1335 | ||
1336 | /* see ocfs2_meta_lock_with_page() */ | |
1337 | int ocfs2_data_lock_with_page(struct inode *inode, | |
1338 | int write, | |
1339 | struct page *page) | |
1340 | { | |
1341 | int ret; | |
1342 | ||
1343 | ret = ocfs2_data_lock_full(inode, write, OCFS2_LOCK_NONBLOCK); | |
1344 | if (ret == -EAGAIN) { | |
1345 | unlock_page(page); | |
1346 | if (ocfs2_data_lock(inode, write) == 0) | |
1347 | ocfs2_data_unlock(inode, write); | |
1348 | ret = AOP_TRUNCATED_PAGE; | |
1349 | } | |
1350 | ||
1351 | return ret; | |
1352 | } | |
1353 | ||
1354 | static void ocfs2_vote_on_unlock(struct ocfs2_super *osb, | |
1355 | struct ocfs2_lock_res *lockres) | |
1356 | { | |
1357 | int kick = 0; | |
1358 | ||
1359 | mlog_entry_void(); | |
1360 | ||
1361 | /* If we know that another node is waiting on our lock, kick | |
1362 | * the vote thread * pre-emptively when we reach a release | |
1363 | * condition. */ | |
1364 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) { | |
1365 | switch(lockres->l_blocking) { | |
1366 | case LKM_EXMODE: | |
1367 | if (!lockres->l_ex_holders && !lockres->l_ro_holders) | |
1368 | kick = 1; | |
1369 | break; | |
1370 | case LKM_PRMODE: | |
1371 | if (!lockres->l_ex_holders) | |
1372 | kick = 1; | |
1373 | break; | |
1374 | default: | |
1375 | BUG(); | |
1376 | } | |
1377 | } | |
1378 | ||
1379 | if (kick) | |
1380 | ocfs2_kick_vote_thread(osb); | |
1381 | ||
1382 | mlog_exit_void(); | |
1383 | } | |
1384 | ||
1385 | void ocfs2_data_unlock(struct inode *inode, | |
1386 | int write) | |
1387 | { | |
1388 | int level = write ? LKM_EXMODE : LKM_PRMODE; | |
1389 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_data_lockres; | |
c271c5c2 | 1390 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
1391 | |
1392 | mlog_entry_void(); | |
1393 | ||
b0697053 MF |
1394 | mlog(0, "inode %llu drop %s DATA lock\n", |
1395 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1396 | write ? "EXMODE" : "PRMODE"); |
1397 | ||
c271c5c2 SM |
1398 | if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)) && |
1399 | !ocfs2_mount_local(osb)) | |
ccd979bd MF |
1400 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); |
1401 | ||
1402 | mlog_exit_void(); | |
1403 | } | |
1404 | ||
1405 | #define OCFS2_SEC_BITS 34 | |
1406 | #define OCFS2_SEC_SHIFT (64 - 34) | |
1407 | #define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1) | |
1408 | ||
1409 | /* LVB only has room for 64 bits of time here so we pack it for | |
1410 | * now. */ | |
1411 | static u64 ocfs2_pack_timespec(struct timespec *spec) | |
1412 | { | |
1413 | u64 res; | |
1414 | u64 sec = spec->tv_sec; | |
1415 | u32 nsec = spec->tv_nsec; | |
1416 | ||
1417 | res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK); | |
1418 | ||
1419 | return res; | |
1420 | } | |
1421 | ||
1422 | /* Call this with the lockres locked. I am reasonably sure we don't | |
1423 | * need ip_lock in this function as anyone who would be changing those | |
1424 | * values is supposed to be blocked in ocfs2_meta_lock right now. */ | |
1425 | static void __ocfs2_stuff_meta_lvb(struct inode *inode) | |
1426 | { | |
1427 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
1428 | struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres; | |
1429 | struct ocfs2_meta_lvb *lvb; | |
1430 | ||
1431 | mlog_entry_void(); | |
1432 | ||
1433 | lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; | |
1434 | ||
24c19ef4 MF |
1435 | /* |
1436 | * Invalidate the LVB of a deleted inode - this way other | |
1437 | * nodes are forced to go to disk and discover the new inode | |
1438 | * status. | |
1439 | */ | |
1440 | if (oi->ip_flags & OCFS2_INODE_DELETED) { | |
1441 | lvb->lvb_version = 0; | |
1442 | goto out; | |
1443 | } | |
1444 | ||
4d3b83f7 | 1445 | lvb->lvb_version = OCFS2_LVB_VERSION; |
ccd979bd MF |
1446 | lvb->lvb_isize = cpu_to_be64(i_size_read(inode)); |
1447 | lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters); | |
1448 | lvb->lvb_iuid = cpu_to_be32(inode->i_uid); | |
1449 | lvb->lvb_igid = cpu_to_be32(inode->i_gid); | |
1450 | lvb->lvb_imode = cpu_to_be16(inode->i_mode); | |
1451 | lvb->lvb_inlink = cpu_to_be16(inode->i_nlink); | |
1452 | lvb->lvb_iatime_packed = | |
1453 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime)); | |
1454 | lvb->lvb_ictime_packed = | |
1455 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime)); | |
1456 | lvb->lvb_imtime_packed = | |
1457 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime)); | |
ca4d147e | 1458 | lvb->lvb_iattr = cpu_to_be32(oi->ip_attr); |
f9e2d82e | 1459 | lvb->lvb_igeneration = cpu_to_be32(inode->i_generation); |
ccd979bd | 1460 | |
24c19ef4 | 1461 | out: |
ccd979bd MF |
1462 | mlog_meta_lvb(0, lockres); |
1463 | ||
1464 | mlog_exit_void(); | |
1465 | } | |
1466 | ||
1467 | static void ocfs2_unpack_timespec(struct timespec *spec, | |
1468 | u64 packed_time) | |
1469 | { | |
1470 | spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT; | |
1471 | spec->tv_nsec = packed_time & OCFS2_NSEC_MASK; | |
1472 | } | |
1473 | ||
1474 | static void ocfs2_refresh_inode_from_lvb(struct inode *inode) | |
1475 | { | |
1476 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
1477 | struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres; | |
1478 | struct ocfs2_meta_lvb *lvb; | |
1479 | ||
1480 | mlog_entry_void(); | |
1481 | ||
1482 | mlog_meta_lvb(0, lockres); | |
1483 | ||
1484 | lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; | |
1485 | ||
1486 | /* We're safe here without the lockres lock... */ | |
1487 | spin_lock(&oi->ip_lock); | |
1488 | oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters); | |
1489 | i_size_write(inode, be64_to_cpu(lvb->lvb_isize)); | |
1490 | ||
ca4d147e HP |
1491 | oi->ip_attr = be32_to_cpu(lvb->lvb_iattr); |
1492 | ocfs2_set_inode_flags(inode); | |
1493 | ||
ccd979bd MF |
1494 | /* fast-symlinks are a special case */ |
1495 | if (S_ISLNK(inode->i_mode) && !oi->ip_clusters) | |
1496 | inode->i_blocks = 0; | |
1497 | else | |
1498 | inode->i_blocks = | |
1499 | ocfs2_align_bytes_to_sectors(i_size_read(inode)); | |
1500 | ||
1501 | inode->i_uid = be32_to_cpu(lvb->lvb_iuid); | |
1502 | inode->i_gid = be32_to_cpu(lvb->lvb_igid); | |
1503 | inode->i_mode = be16_to_cpu(lvb->lvb_imode); | |
1504 | inode->i_nlink = be16_to_cpu(lvb->lvb_inlink); | |
1505 | ocfs2_unpack_timespec(&inode->i_atime, | |
1506 | be64_to_cpu(lvb->lvb_iatime_packed)); | |
1507 | ocfs2_unpack_timespec(&inode->i_mtime, | |
1508 | be64_to_cpu(lvb->lvb_imtime_packed)); | |
1509 | ocfs2_unpack_timespec(&inode->i_ctime, | |
1510 | be64_to_cpu(lvb->lvb_ictime_packed)); | |
1511 | spin_unlock(&oi->ip_lock); | |
1512 | ||
1513 | mlog_exit_void(); | |
1514 | } | |
1515 | ||
f9e2d82e MF |
1516 | static inline int ocfs2_meta_lvb_is_trustable(struct inode *inode, |
1517 | struct ocfs2_lock_res *lockres) | |
ccd979bd MF |
1518 | { |
1519 | struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; | |
1520 | ||
f9e2d82e MF |
1521 | if (lvb->lvb_version == OCFS2_LVB_VERSION |
1522 | && be32_to_cpu(lvb->lvb_igeneration) == inode->i_generation) | |
ccd979bd MF |
1523 | return 1; |
1524 | return 0; | |
1525 | } | |
1526 | ||
1527 | /* Determine whether a lock resource needs to be refreshed, and | |
1528 | * arbitrate who gets to refresh it. | |
1529 | * | |
1530 | * 0 means no refresh needed. | |
1531 | * | |
1532 | * > 0 means you need to refresh this and you MUST call | |
1533 | * ocfs2_complete_lock_res_refresh afterwards. */ | |
1534 | static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres) | |
1535 | { | |
1536 | unsigned long flags; | |
1537 | int status = 0; | |
1538 | ||
1539 | mlog_entry_void(); | |
1540 | ||
1541 | refresh_check: | |
1542 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1543 | if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) { | |
1544 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1545 | goto bail; | |
1546 | } | |
1547 | ||
1548 | if (lockres->l_flags & OCFS2_LOCK_REFRESHING) { | |
1549 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1550 | ||
1551 | ocfs2_wait_on_refreshing_lock(lockres); | |
1552 | goto refresh_check; | |
1553 | } | |
1554 | ||
1555 | /* Ok, I'll be the one to refresh this lock. */ | |
1556 | lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING); | |
1557 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1558 | ||
1559 | status = 1; | |
1560 | bail: | |
1561 | mlog_exit(status); | |
1562 | return status; | |
1563 | } | |
1564 | ||
1565 | /* If status is non zero, I'll mark it as not being in refresh | |
1566 | * anymroe, but i won't clear the needs refresh flag. */ | |
1567 | static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres, | |
1568 | int status) | |
1569 | { | |
1570 | unsigned long flags; | |
1571 | mlog_entry_void(); | |
1572 | ||
1573 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1574 | lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING); | |
1575 | if (!status) | |
1576 | lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); | |
1577 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1578 | ||
1579 | wake_up(&lockres->l_event); | |
1580 | ||
1581 | mlog_exit_void(); | |
1582 | } | |
1583 | ||
1584 | /* may or may not return a bh if it went to disk. */ | |
1585 | static int ocfs2_meta_lock_update(struct inode *inode, | |
1586 | struct buffer_head **bh) | |
1587 | { | |
1588 | int status = 0; | |
1589 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
be9e986b | 1590 | struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres; |
ccd979bd | 1591 | struct ocfs2_dinode *fe; |
c271c5c2 | 1592 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
1593 | |
1594 | mlog_entry_void(); | |
1595 | ||
be9e986b MF |
1596 | if (ocfs2_mount_local(osb)) |
1597 | goto bail; | |
1598 | ||
ccd979bd MF |
1599 | spin_lock(&oi->ip_lock); |
1600 | if (oi->ip_flags & OCFS2_INODE_DELETED) { | |
b0697053 | 1601 | mlog(0, "Orphaned inode %llu was deleted while we " |
ccd979bd | 1602 | "were waiting on a lock. ip_flags = 0x%x\n", |
b0697053 | 1603 | (unsigned long long)oi->ip_blkno, oi->ip_flags); |
ccd979bd MF |
1604 | spin_unlock(&oi->ip_lock); |
1605 | status = -ENOENT; | |
1606 | goto bail; | |
1607 | } | |
1608 | spin_unlock(&oi->ip_lock); | |
1609 | ||
be9e986b MF |
1610 | if (!ocfs2_should_refresh_lock_res(lockres)) |
1611 | goto bail; | |
ccd979bd MF |
1612 | |
1613 | /* This will discard any caching information we might have had | |
1614 | * for the inode metadata. */ | |
1615 | ocfs2_metadata_cache_purge(inode); | |
1616 | ||
be9e986b | 1617 | if (ocfs2_meta_lvb_is_trustable(inode, lockres)) { |
b0697053 MF |
1618 | mlog(0, "Trusting LVB on inode %llu\n", |
1619 | (unsigned long long)oi->ip_blkno); | |
ccd979bd MF |
1620 | ocfs2_refresh_inode_from_lvb(inode); |
1621 | } else { | |
1622 | /* Boo, we have to go to disk. */ | |
1623 | /* read bh, cast, ocfs2_refresh_inode */ | |
1624 | status = ocfs2_read_block(OCFS2_SB(inode->i_sb), oi->ip_blkno, | |
1625 | bh, OCFS2_BH_CACHED, inode); | |
1626 | if (status < 0) { | |
1627 | mlog_errno(status); | |
1628 | goto bail_refresh; | |
1629 | } | |
1630 | fe = (struct ocfs2_dinode *) (*bh)->b_data; | |
1631 | ||
1632 | /* This is a good chance to make sure we're not | |
1633 | * locking an invalid object. | |
1634 | * | |
1635 | * We bug on a stale inode here because we checked | |
1636 | * above whether it was wiped from disk. The wiping | |
1637 | * node provides a guarantee that we receive that | |
1638 | * message and can mark the inode before dropping any | |
1639 | * locks associated with it. */ | |
1640 | if (!OCFS2_IS_VALID_DINODE(fe)) { | |
1641 | OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); | |
1642 | status = -EIO; | |
1643 | goto bail_refresh; | |
1644 | } | |
1645 | mlog_bug_on_msg(inode->i_generation != | |
1646 | le32_to_cpu(fe->i_generation), | |
b0697053 | 1647 | "Invalid dinode %llu disk generation: %u " |
ccd979bd | 1648 | "inode->i_generation: %u\n", |
b0697053 MF |
1649 | (unsigned long long)oi->ip_blkno, |
1650 | le32_to_cpu(fe->i_generation), | |
ccd979bd MF |
1651 | inode->i_generation); |
1652 | mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) || | |
1653 | !(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)), | |
b0697053 MF |
1654 | "Stale dinode %llu dtime: %llu flags: 0x%x\n", |
1655 | (unsigned long long)oi->ip_blkno, | |
1656 | (unsigned long long)le64_to_cpu(fe->i_dtime), | |
ccd979bd MF |
1657 | le32_to_cpu(fe->i_flags)); |
1658 | ||
1659 | ocfs2_refresh_inode(inode, fe); | |
1660 | } | |
1661 | ||
1662 | status = 0; | |
1663 | bail_refresh: | |
be9e986b | 1664 | ocfs2_complete_lock_res_refresh(lockres, status); |
ccd979bd MF |
1665 | bail: |
1666 | mlog_exit(status); | |
1667 | return status; | |
1668 | } | |
1669 | ||
1670 | static int ocfs2_assign_bh(struct inode *inode, | |
1671 | struct buffer_head **ret_bh, | |
1672 | struct buffer_head *passed_bh) | |
1673 | { | |
1674 | int status; | |
1675 | ||
1676 | if (passed_bh) { | |
1677 | /* Ok, the update went to disk for us, use the | |
1678 | * returned bh. */ | |
1679 | *ret_bh = passed_bh; | |
1680 | get_bh(*ret_bh); | |
1681 | ||
1682 | return 0; | |
1683 | } | |
1684 | ||
1685 | status = ocfs2_read_block(OCFS2_SB(inode->i_sb), | |
1686 | OCFS2_I(inode)->ip_blkno, | |
1687 | ret_bh, | |
1688 | OCFS2_BH_CACHED, | |
1689 | inode); | |
1690 | if (status < 0) | |
1691 | mlog_errno(status); | |
1692 | ||
1693 | return status; | |
1694 | } | |
1695 | ||
1696 | /* | |
1697 | * returns < 0 error if the callback will never be called, otherwise | |
1698 | * the result of the lock will be communicated via the callback. | |
1699 | */ | |
1700 | int ocfs2_meta_lock_full(struct inode *inode, | |
ccd979bd MF |
1701 | struct buffer_head **ret_bh, |
1702 | int ex, | |
1703 | int arg_flags) | |
1704 | { | |
1705 | int status, level, dlm_flags, acquired; | |
c271c5c2 | 1706 | struct ocfs2_lock_res *lockres = NULL; |
ccd979bd MF |
1707 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
1708 | struct buffer_head *local_bh = NULL; | |
1709 | ||
1710 | BUG_ON(!inode); | |
1711 | ||
1712 | mlog_entry_void(); | |
1713 | ||
b0697053 MF |
1714 | mlog(0, "inode %llu, take %s META lock\n", |
1715 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1716 | ex ? "EXMODE" : "PRMODE"); |
1717 | ||
1718 | status = 0; | |
1719 | acquired = 0; | |
1720 | /* We'll allow faking a readonly metadata lock for | |
1721 | * rodevices. */ | |
1722 | if (ocfs2_is_hard_readonly(osb)) { | |
1723 | if (ex) | |
1724 | status = -EROFS; | |
1725 | goto bail; | |
1726 | } | |
1727 | ||
c271c5c2 SM |
1728 | if (ocfs2_mount_local(osb)) |
1729 | goto local; | |
1730 | ||
ccd979bd MF |
1731 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) |
1732 | wait_event(osb->recovery_event, | |
1733 | ocfs2_node_map_is_empty(osb, &osb->recovery_map)); | |
1734 | ||
ccd979bd MF |
1735 | lockres = &OCFS2_I(inode)->ip_meta_lockres; |
1736 | level = ex ? LKM_EXMODE : LKM_PRMODE; | |
1737 | dlm_flags = 0; | |
1738 | if (arg_flags & OCFS2_META_LOCK_NOQUEUE) | |
1739 | dlm_flags |= LKM_NOQUEUE; | |
1740 | ||
1741 | status = ocfs2_cluster_lock(osb, lockres, level, dlm_flags, arg_flags); | |
1742 | if (status < 0) { | |
1743 | if (status != -EAGAIN && status != -EIOCBRETRY) | |
1744 | mlog_errno(status); | |
1745 | goto bail; | |
1746 | } | |
1747 | ||
1748 | /* Notify the error cleanup path to drop the cluster lock. */ | |
1749 | acquired = 1; | |
1750 | ||
1751 | /* We wait twice because a node may have died while we were in | |
1752 | * the lower dlm layers. The second time though, we've | |
1753 | * committed to owning this lock so we don't allow signals to | |
1754 | * abort the operation. */ | |
1755 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) | |
1756 | wait_event(osb->recovery_event, | |
1757 | ocfs2_node_map_is_empty(osb, &osb->recovery_map)); | |
1758 | ||
c271c5c2 | 1759 | local: |
24c19ef4 MF |
1760 | /* |
1761 | * We only see this flag if we're being called from | |
1762 | * ocfs2_read_locked_inode(). It means we're locking an inode | |
1763 | * which hasn't been populated yet, so clear the refresh flag | |
1764 | * and let the caller handle it. | |
1765 | */ | |
1766 | if (inode->i_state & I_NEW) { | |
1767 | status = 0; | |
c271c5c2 SM |
1768 | if (lockres) |
1769 | ocfs2_complete_lock_res_refresh(lockres, 0); | |
24c19ef4 MF |
1770 | goto bail; |
1771 | } | |
1772 | ||
ccd979bd MF |
1773 | /* This is fun. The caller may want a bh back, or it may |
1774 | * not. ocfs2_meta_lock_update definitely wants one in, but | |
1775 | * may or may not read one, depending on what's in the | |
1776 | * LVB. The result of all of this is that we've *only* gone to | |
1777 | * disk if we have to, so the complexity is worthwhile. */ | |
1778 | status = ocfs2_meta_lock_update(inode, &local_bh); | |
1779 | if (status < 0) { | |
1780 | if (status != -ENOENT) | |
1781 | mlog_errno(status); | |
1782 | goto bail; | |
1783 | } | |
1784 | ||
1785 | if (ret_bh) { | |
1786 | status = ocfs2_assign_bh(inode, ret_bh, local_bh); | |
1787 | if (status < 0) { | |
1788 | mlog_errno(status); | |
1789 | goto bail; | |
1790 | } | |
1791 | } | |
1792 | ||
ccd979bd MF |
1793 | bail: |
1794 | if (status < 0) { | |
1795 | if (ret_bh && (*ret_bh)) { | |
1796 | brelse(*ret_bh); | |
1797 | *ret_bh = NULL; | |
1798 | } | |
1799 | if (acquired) | |
1800 | ocfs2_meta_unlock(inode, ex); | |
1801 | } | |
1802 | ||
1803 | if (local_bh) | |
1804 | brelse(local_bh); | |
1805 | ||
1806 | mlog_exit(status); | |
1807 | return status; | |
1808 | } | |
1809 | ||
1810 | /* | |
1811 | * This is working around a lock inversion between tasks acquiring DLM locks | |
1812 | * while holding a page lock and the vote thread which blocks dlm lock acquiry | |
1813 | * while acquiring page locks. | |
1814 | * | |
1815 | * ** These _with_page variantes are only intended to be called from aop | |
1816 | * methods that hold page locks and return a very specific *positive* error | |
1817 | * code that aop methods pass up to the VFS -- test for errors with != 0. ** | |
1818 | * | |
1819 | * The DLM is called such that it returns -EAGAIN if it would have blocked | |
1820 | * waiting for the vote thread. In that case we unlock our page so the vote | |
1821 | * thread can make progress. Once we've done this we have to return | |
1822 | * AOP_TRUNCATED_PAGE so the aop method that called us can bubble that back up | |
1823 | * into the VFS who will then immediately retry the aop call. | |
1824 | * | |
1825 | * We do a blocking lock and immediate unlock before returning, though, so that | |
1826 | * the lock has a great chance of being cached on this node by the time the VFS | |
1827 | * calls back to retry the aop. This has a potential to livelock as nodes | |
1828 | * ping locks back and forth, but that's a risk we're willing to take to avoid | |
1829 | * the lock inversion simply. | |
1830 | */ | |
1831 | int ocfs2_meta_lock_with_page(struct inode *inode, | |
ccd979bd MF |
1832 | struct buffer_head **ret_bh, |
1833 | int ex, | |
1834 | struct page *page) | |
1835 | { | |
1836 | int ret; | |
1837 | ||
4bcec184 | 1838 | ret = ocfs2_meta_lock_full(inode, ret_bh, ex, OCFS2_LOCK_NONBLOCK); |
ccd979bd MF |
1839 | if (ret == -EAGAIN) { |
1840 | unlock_page(page); | |
4bcec184 | 1841 | if (ocfs2_meta_lock(inode, ret_bh, ex) == 0) |
ccd979bd MF |
1842 | ocfs2_meta_unlock(inode, ex); |
1843 | ret = AOP_TRUNCATED_PAGE; | |
1844 | } | |
1845 | ||
1846 | return ret; | |
1847 | } | |
1848 | ||
7f1a37e3 TY |
1849 | int ocfs2_meta_lock_atime(struct inode *inode, |
1850 | struct vfsmount *vfsmnt, | |
1851 | int *level) | |
1852 | { | |
1853 | int ret; | |
1854 | ||
1855 | mlog_entry_void(); | |
1856 | ret = ocfs2_meta_lock(inode, NULL, 0); | |
1857 | if (ret < 0) { | |
1858 | mlog_errno(ret); | |
1859 | return ret; | |
1860 | } | |
1861 | ||
1862 | /* | |
1863 | * If we should update atime, we will get EX lock, | |
1864 | * otherwise we just get PR lock. | |
1865 | */ | |
1866 | if (ocfs2_should_update_atime(inode, vfsmnt)) { | |
1867 | struct buffer_head *bh = NULL; | |
1868 | ||
1869 | ocfs2_meta_unlock(inode, 0); | |
1870 | ret = ocfs2_meta_lock(inode, &bh, 1); | |
1871 | if (ret < 0) { | |
1872 | mlog_errno(ret); | |
1873 | return ret; | |
1874 | } | |
1875 | *level = 1; | |
1876 | if (ocfs2_should_update_atime(inode, vfsmnt)) | |
1877 | ocfs2_update_inode_atime(inode, bh); | |
1878 | if (bh) | |
1879 | brelse(bh); | |
1880 | } else | |
1881 | *level = 0; | |
1882 | ||
1883 | mlog_exit(ret); | |
1884 | return ret; | |
1885 | } | |
1886 | ||
ccd979bd MF |
1887 | void ocfs2_meta_unlock(struct inode *inode, |
1888 | int ex) | |
1889 | { | |
1890 | int level = ex ? LKM_EXMODE : LKM_PRMODE; | |
1891 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres; | |
c271c5c2 | 1892 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
1893 | |
1894 | mlog_entry_void(); | |
1895 | ||
b0697053 MF |
1896 | mlog(0, "inode %llu drop %s META lock\n", |
1897 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1898 | ex ? "EXMODE" : "PRMODE"); |
1899 | ||
c271c5c2 SM |
1900 | if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)) && |
1901 | !ocfs2_mount_local(osb)) | |
ccd979bd MF |
1902 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); |
1903 | ||
1904 | mlog_exit_void(); | |
1905 | } | |
1906 | ||
1907 | int ocfs2_super_lock(struct ocfs2_super *osb, | |
1908 | int ex) | |
1909 | { | |
c271c5c2 | 1910 | int status = 0; |
ccd979bd MF |
1911 | int level = ex ? LKM_EXMODE : LKM_PRMODE; |
1912 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; | |
1913 | struct buffer_head *bh; | |
1914 | struct ocfs2_slot_info *si = osb->slot_info; | |
1915 | ||
1916 | mlog_entry_void(); | |
1917 | ||
1918 | if (ocfs2_is_hard_readonly(osb)) | |
1919 | return -EROFS; | |
1920 | ||
c271c5c2 SM |
1921 | if (ocfs2_mount_local(osb)) |
1922 | goto bail; | |
1923 | ||
ccd979bd MF |
1924 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); |
1925 | if (status < 0) { | |
1926 | mlog_errno(status); | |
1927 | goto bail; | |
1928 | } | |
1929 | ||
1930 | /* The super block lock path is really in the best position to | |
1931 | * know when resources covered by the lock need to be | |
1932 | * refreshed, so we do it here. Of course, making sense of | |
1933 | * everything is up to the caller :) */ | |
1934 | status = ocfs2_should_refresh_lock_res(lockres); | |
1935 | if (status < 0) { | |
1936 | mlog_errno(status); | |
1937 | goto bail; | |
1938 | } | |
1939 | if (status) { | |
1940 | bh = si->si_bh; | |
1941 | status = ocfs2_read_block(osb, bh->b_blocknr, &bh, 0, | |
1942 | si->si_inode); | |
1943 | if (status == 0) | |
1944 | ocfs2_update_slot_info(si); | |
1945 | ||
1946 | ocfs2_complete_lock_res_refresh(lockres, status); | |
1947 | ||
1948 | if (status < 0) | |
1949 | mlog_errno(status); | |
1950 | } | |
1951 | bail: | |
1952 | mlog_exit(status); | |
1953 | return status; | |
1954 | } | |
1955 | ||
1956 | void ocfs2_super_unlock(struct ocfs2_super *osb, | |
1957 | int ex) | |
1958 | { | |
1959 | int level = ex ? LKM_EXMODE : LKM_PRMODE; | |
1960 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; | |
1961 | ||
c271c5c2 SM |
1962 | if (!ocfs2_mount_local(osb)) |
1963 | ocfs2_cluster_unlock(osb, lockres, level); | |
ccd979bd MF |
1964 | } |
1965 | ||
1966 | int ocfs2_rename_lock(struct ocfs2_super *osb) | |
1967 | { | |
1968 | int status; | |
1969 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; | |
1970 | ||
1971 | if (ocfs2_is_hard_readonly(osb)) | |
1972 | return -EROFS; | |
1973 | ||
c271c5c2 SM |
1974 | if (ocfs2_mount_local(osb)) |
1975 | return 0; | |
1976 | ||
ccd979bd MF |
1977 | status = ocfs2_cluster_lock(osb, lockres, LKM_EXMODE, 0, 0); |
1978 | if (status < 0) | |
1979 | mlog_errno(status); | |
1980 | ||
1981 | return status; | |
1982 | } | |
1983 | ||
1984 | void ocfs2_rename_unlock(struct ocfs2_super *osb) | |
1985 | { | |
1986 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; | |
1987 | ||
c271c5c2 SM |
1988 | if (!ocfs2_mount_local(osb)) |
1989 | ocfs2_cluster_unlock(osb, lockres, LKM_EXMODE); | |
ccd979bd MF |
1990 | } |
1991 | ||
d680efe9 MF |
1992 | int ocfs2_dentry_lock(struct dentry *dentry, int ex) |
1993 | { | |
1994 | int ret; | |
1995 | int level = ex ? LKM_EXMODE : LKM_PRMODE; | |
1996 | struct ocfs2_dentry_lock *dl = dentry->d_fsdata; | |
1997 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); | |
1998 | ||
1999 | BUG_ON(!dl); | |
2000 | ||
2001 | if (ocfs2_is_hard_readonly(osb)) | |
2002 | return -EROFS; | |
2003 | ||
c271c5c2 SM |
2004 | if (ocfs2_mount_local(osb)) |
2005 | return 0; | |
2006 | ||
d680efe9 MF |
2007 | ret = ocfs2_cluster_lock(osb, &dl->dl_lockres, level, 0, 0); |
2008 | if (ret < 0) | |
2009 | mlog_errno(ret); | |
2010 | ||
2011 | return ret; | |
2012 | } | |
2013 | ||
2014 | void ocfs2_dentry_unlock(struct dentry *dentry, int ex) | |
2015 | { | |
2016 | int level = ex ? LKM_EXMODE : LKM_PRMODE; | |
2017 | struct ocfs2_dentry_lock *dl = dentry->d_fsdata; | |
2018 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); | |
2019 | ||
c271c5c2 SM |
2020 | if (!ocfs2_mount_local(osb)) |
2021 | ocfs2_cluster_unlock(osb, &dl->dl_lockres, level); | |
d680efe9 MF |
2022 | } |
2023 | ||
ccd979bd MF |
2024 | /* Reference counting of the dlm debug structure. We want this because |
2025 | * open references on the debug inodes can live on after a mount, so | |
2026 | * we can't rely on the ocfs2_super to always exist. */ | |
2027 | static void ocfs2_dlm_debug_free(struct kref *kref) | |
2028 | { | |
2029 | struct ocfs2_dlm_debug *dlm_debug; | |
2030 | ||
2031 | dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt); | |
2032 | ||
2033 | kfree(dlm_debug); | |
2034 | } | |
2035 | ||
2036 | void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug) | |
2037 | { | |
2038 | if (dlm_debug) | |
2039 | kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free); | |
2040 | } | |
2041 | ||
2042 | static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug) | |
2043 | { | |
2044 | kref_get(&debug->d_refcnt); | |
2045 | } | |
2046 | ||
2047 | struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void) | |
2048 | { | |
2049 | struct ocfs2_dlm_debug *dlm_debug; | |
2050 | ||
2051 | dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL); | |
2052 | if (!dlm_debug) { | |
2053 | mlog_errno(-ENOMEM); | |
2054 | goto out; | |
2055 | } | |
2056 | ||
2057 | kref_init(&dlm_debug->d_refcnt); | |
2058 | INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking); | |
2059 | dlm_debug->d_locking_state = NULL; | |
2060 | out: | |
2061 | return dlm_debug; | |
2062 | } | |
2063 | ||
2064 | /* Access to this is arbitrated for us via seq_file->sem. */ | |
2065 | struct ocfs2_dlm_seq_priv { | |
2066 | struct ocfs2_dlm_debug *p_dlm_debug; | |
2067 | struct ocfs2_lock_res p_iter_res; | |
2068 | struct ocfs2_lock_res p_tmp_res; | |
2069 | }; | |
2070 | ||
2071 | static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start, | |
2072 | struct ocfs2_dlm_seq_priv *priv) | |
2073 | { | |
2074 | struct ocfs2_lock_res *iter, *ret = NULL; | |
2075 | struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug; | |
2076 | ||
2077 | assert_spin_locked(&ocfs2_dlm_tracking_lock); | |
2078 | ||
2079 | list_for_each_entry(iter, &start->l_debug_list, l_debug_list) { | |
2080 | /* discover the head of the list */ | |
2081 | if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) { | |
2082 | mlog(0, "End of list found, %p\n", ret); | |
2083 | break; | |
2084 | } | |
2085 | ||
2086 | /* We track our "dummy" iteration lockres' by a NULL | |
2087 | * l_ops field. */ | |
2088 | if (iter->l_ops != NULL) { | |
2089 | ret = iter; | |
2090 | break; | |
2091 | } | |
2092 | } | |
2093 | ||
2094 | return ret; | |
2095 | } | |
2096 | ||
2097 | static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos) | |
2098 | { | |
2099 | struct ocfs2_dlm_seq_priv *priv = m->private; | |
2100 | struct ocfs2_lock_res *iter; | |
2101 | ||
2102 | spin_lock(&ocfs2_dlm_tracking_lock); | |
2103 | iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv); | |
2104 | if (iter) { | |
2105 | /* Since lockres' have the lifetime of their container | |
2106 | * (which can be inodes, ocfs2_supers, etc) we want to | |
2107 | * copy this out to a temporary lockres while still | |
2108 | * under the spinlock. Obviously after this we can't | |
2109 | * trust any pointers on the copy returned, but that's | |
2110 | * ok as the information we want isn't typically held | |
2111 | * in them. */ | |
2112 | priv->p_tmp_res = *iter; | |
2113 | iter = &priv->p_tmp_res; | |
2114 | } | |
2115 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
2116 | ||
2117 | return iter; | |
2118 | } | |
2119 | ||
2120 | static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v) | |
2121 | { | |
2122 | } | |
2123 | ||
2124 | static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
2125 | { | |
2126 | struct ocfs2_dlm_seq_priv *priv = m->private; | |
2127 | struct ocfs2_lock_res *iter = v; | |
2128 | struct ocfs2_lock_res *dummy = &priv->p_iter_res; | |
2129 | ||
2130 | spin_lock(&ocfs2_dlm_tracking_lock); | |
2131 | iter = ocfs2_dlm_next_res(iter, priv); | |
2132 | list_del_init(&dummy->l_debug_list); | |
2133 | if (iter) { | |
2134 | list_add(&dummy->l_debug_list, &iter->l_debug_list); | |
2135 | priv->p_tmp_res = *iter; | |
2136 | iter = &priv->p_tmp_res; | |
2137 | } | |
2138 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
2139 | ||
2140 | return iter; | |
2141 | } | |
2142 | ||
2143 | /* So that debugfs.ocfs2 can determine which format is being used */ | |
2144 | #define OCFS2_DLM_DEBUG_STR_VERSION 1 | |
2145 | static int ocfs2_dlm_seq_show(struct seq_file *m, void *v) | |
2146 | { | |
2147 | int i; | |
2148 | char *lvb; | |
2149 | struct ocfs2_lock_res *lockres = v; | |
2150 | ||
2151 | if (!lockres) | |
2152 | return -EINVAL; | |
2153 | ||
d680efe9 MF |
2154 | seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION); |
2155 | ||
2156 | if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY) | |
2157 | seq_printf(m, "%.*s%08x\t", OCFS2_DENTRY_LOCK_INO_START - 1, | |
2158 | lockres->l_name, | |
2159 | (unsigned int)ocfs2_get_dentry_lock_ino(lockres)); | |
2160 | else | |
2161 | seq_printf(m, "%.*s\t", OCFS2_LOCK_ID_MAX_LEN, lockres->l_name); | |
2162 | ||
2163 | seq_printf(m, "%d\t" | |
ccd979bd MF |
2164 | "0x%lx\t" |
2165 | "0x%x\t" | |
2166 | "0x%x\t" | |
2167 | "%u\t" | |
2168 | "%u\t" | |
2169 | "%d\t" | |
2170 | "%d\t", | |
ccd979bd MF |
2171 | lockres->l_level, |
2172 | lockres->l_flags, | |
2173 | lockres->l_action, | |
2174 | lockres->l_unlock_action, | |
2175 | lockres->l_ro_holders, | |
2176 | lockres->l_ex_holders, | |
2177 | lockres->l_requested, | |
2178 | lockres->l_blocking); | |
2179 | ||
2180 | /* Dump the raw LVB */ | |
2181 | lvb = lockres->l_lksb.lvb; | |
2182 | for(i = 0; i < DLM_LVB_LEN; i++) | |
2183 | seq_printf(m, "0x%x\t", lvb[i]); | |
2184 | ||
2185 | /* End the line */ | |
2186 | seq_printf(m, "\n"); | |
2187 | return 0; | |
2188 | } | |
2189 | ||
2190 | static struct seq_operations ocfs2_dlm_seq_ops = { | |
2191 | .start = ocfs2_dlm_seq_start, | |
2192 | .stop = ocfs2_dlm_seq_stop, | |
2193 | .next = ocfs2_dlm_seq_next, | |
2194 | .show = ocfs2_dlm_seq_show, | |
2195 | }; | |
2196 | ||
2197 | static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file) | |
2198 | { | |
2199 | struct seq_file *seq = (struct seq_file *) file->private_data; | |
2200 | struct ocfs2_dlm_seq_priv *priv = seq->private; | |
2201 | struct ocfs2_lock_res *res = &priv->p_iter_res; | |
2202 | ||
2203 | ocfs2_remove_lockres_tracking(res); | |
2204 | ocfs2_put_dlm_debug(priv->p_dlm_debug); | |
2205 | return seq_release_private(inode, file); | |
2206 | } | |
2207 | ||
2208 | static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file) | |
2209 | { | |
2210 | int ret; | |
2211 | struct ocfs2_dlm_seq_priv *priv; | |
2212 | struct seq_file *seq; | |
2213 | struct ocfs2_super *osb; | |
2214 | ||
2215 | priv = kzalloc(sizeof(struct ocfs2_dlm_seq_priv), GFP_KERNEL); | |
2216 | if (!priv) { | |
2217 | ret = -ENOMEM; | |
2218 | mlog_errno(ret); | |
2219 | goto out; | |
2220 | } | |
8e18e294 | 2221 | osb = inode->i_private; |
ccd979bd MF |
2222 | ocfs2_get_dlm_debug(osb->osb_dlm_debug); |
2223 | priv->p_dlm_debug = osb->osb_dlm_debug; | |
2224 | INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list); | |
2225 | ||
2226 | ret = seq_open(file, &ocfs2_dlm_seq_ops); | |
2227 | if (ret) { | |
2228 | kfree(priv); | |
2229 | mlog_errno(ret); | |
2230 | goto out; | |
2231 | } | |
2232 | ||
2233 | seq = (struct seq_file *) file->private_data; | |
2234 | seq->private = priv; | |
2235 | ||
2236 | ocfs2_add_lockres_tracking(&priv->p_iter_res, | |
2237 | priv->p_dlm_debug); | |
2238 | ||
2239 | out: | |
2240 | return ret; | |
2241 | } | |
2242 | ||
4b6f5d20 | 2243 | static const struct file_operations ocfs2_dlm_debug_fops = { |
ccd979bd MF |
2244 | .open = ocfs2_dlm_debug_open, |
2245 | .release = ocfs2_dlm_debug_release, | |
2246 | .read = seq_read, | |
2247 | .llseek = seq_lseek, | |
2248 | }; | |
2249 | ||
2250 | static int ocfs2_dlm_init_debug(struct ocfs2_super *osb) | |
2251 | { | |
2252 | int ret = 0; | |
2253 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; | |
2254 | ||
2255 | dlm_debug->d_locking_state = debugfs_create_file("locking_state", | |
2256 | S_IFREG|S_IRUSR, | |
2257 | osb->osb_debug_root, | |
2258 | osb, | |
2259 | &ocfs2_dlm_debug_fops); | |
2260 | if (!dlm_debug->d_locking_state) { | |
2261 | ret = -EINVAL; | |
2262 | mlog(ML_ERROR, | |
2263 | "Unable to create locking state debugfs file.\n"); | |
2264 | goto out; | |
2265 | } | |
2266 | ||
2267 | ocfs2_get_dlm_debug(dlm_debug); | |
2268 | out: | |
2269 | return ret; | |
2270 | } | |
2271 | ||
2272 | static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb) | |
2273 | { | |
2274 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; | |
2275 | ||
2276 | if (dlm_debug) { | |
2277 | debugfs_remove(dlm_debug->d_locking_state); | |
2278 | ocfs2_put_dlm_debug(dlm_debug); | |
2279 | } | |
2280 | } | |
2281 | ||
2282 | int ocfs2_dlm_init(struct ocfs2_super *osb) | |
2283 | { | |
c271c5c2 | 2284 | int status = 0; |
ccd979bd | 2285 | u32 dlm_key; |
c271c5c2 | 2286 | struct dlm_ctxt *dlm = NULL; |
ccd979bd MF |
2287 | |
2288 | mlog_entry_void(); | |
2289 | ||
c271c5c2 SM |
2290 | if (ocfs2_mount_local(osb)) |
2291 | goto local; | |
2292 | ||
ccd979bd MF |
2293 | status = ocfs2_dlm_init_debug(osb); |
2294 | if (status < 0) { | |
2295 | mlog_errno(status); | |
2296 | goto bail; | |
2297 | } | |
2298 | ||
2299 | /* launch vote thread */ | |
78427043 | 2300 | osb->vote_task = kthread_run(ocfs2_vote_thread, osb, "ocfs2vote"); |
ccd979bd MF |
2301 | if (IS_ERR(osb->vote_task)) { |
2302 | status = PTR_ERR(osb->vote_task); | |
2303 | osb->vote_task = NULL; | |
2304 | mlog_errno(status); | |
2305 | goto bail; | |
2306 | } | |
2307 | ||
2308 | /* used by the dlm code to make message headers unique, each | |
2309 | * node in this domain must agree on this. */ | |
2310 | dlm_key = crc32_le(0, osb->uuid_str, strlen(osb->uuid_str)); | |
2311 | ||
2312 | /* for now, uuid == domain */ | |
2313 | dlm = dlm_register_domain(osb->uuid_str, dlm_key); | |
2314 | if (IS_ERR(dlm)) { | |
2315 | status = PTR_ERR(dlm); | |
2316 | mlog_errno(status); | |
2317 | goto bail; | |
2318 | } | |
2319 | ||
c271c5c2 SM |
2320 | dlm_register_eviction_cb(dlm, &osb->osb_eviction_cb); |
2321 | ||
2322 | local: | |
ccd979bd MF |
2323 | ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb); |
2324 | ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb); | |
2325 | ||
ccd979bd MF |
2326 | osb->dlm = dlm; |
2327 | ||
2328 | status = 0; | |
2329 | bail: | |
2330 | if (status < 0) { | |
2331 | ocfs2_dlm_shutdown_debug(osb); | |
2332 | if (osb->vote_task) | |
2333 | kthread_stop(osb->vote_task); | |
2334 | } | |
2335 | ||
2336 | mlog_exit(status); | |
2337 | return status; | |
2338 | } | |
2339 | ||
2340 | void ocfs2_dlm_shutdown(struct ocfs2_super *osb) | |
2341 | { | |
2342 | mlog_entry_void(); | |
2343 | ||
2344 | dlm_unregister_eviction_cb(&osb->osb_eviction_cb); | |
2345 | ||
2346 | ocfs2_drop_osb_locks(osb); | |
2347 | ||
2348 | if (osb->vote_task) { | |
2349 | kthread_stop(osb->vote_task); | |
2350 | osb->vote_task = NULL; | |
2351 | } | |
2352 | ||
2353 | ocfs2_lock_res_free(&osb->osb_super_lockres); | |
2354 | ocfs2_lock_res_free(&osb->osb_rename_lockres); | |
2355 | ||
2356 | dlm_unregister_domain(osb->dlm); | |
2357 | osb->dlm = NULL; | |
2358 | ||
2359 | ocfs2_dlm_shutdown_debug(osb); | |
2360 | ||
2361 | mlog_exit_void(); | |
2362 | } | |
2363 | ||
2a45f2d1 | 2364 | static void ocfs2_unlock_ast(void *opaque, enum dlm_status status) |
ccd979bd MF |
2365 | { |
2366 | struct ocfs2_lock_res *lockres = opaque; | |
2367 | unsigned long flags; | |
2368 | ||
2369 | mlog_entry_void(); | |
2370 | ||
2371 | mlog(0, "UNLOCK AST called on lock %s, action = %d\n", lockres->l_name, | |
2372 | lockres->l_unlock_action); | |
2373 | ||
2374 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2375 | /* We tried to cancel a convert request, but it was already | |
2376 | * granted. All we want to do here is clear our unlock | |
2377 | * state. The wake_up call done at the bottom is redundant | |
2378 | * (ocfs2_prepare_cancel_convert doesn't sleep on this) but doesn't | |
2379 | * hurt anything anyway */ | |
2380 | if (status == DLM_CANCELGRANT && | |
2381 | lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { | |
2382 | mlog(0, "Got cancelgrant for %s\n", lockres->l_name); | |
2383 | ||
2384 | /* We don't clear the busy flag in this case as it | |
2385 | * should have been cleared by the ast which the dlm | |
2386 | * has called. */ | |
2387 | goto complete_unlock; | |
2388 | } | |
2389 | ||
2390 | if (status != DLM_NORMAL) { | |
2391 | mlog(ML_ERROR, "Dlm passes status %d for lock %s, " | |
2392 | "unlock_action %d\n", status, lockres->l_name, | |
2393 | lockres->l_unlock_action); | |
2394 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2395 | return; | |
2396 | } | |
2397 | ||
2398 | switch(lockres->l_unlock_action) { | |
2399 | case OCFS2_UNLOCK_CANCEL_CONVERT: | |
2400 | mlog(0, "Cancel convert success for %s\n", lockres->l_name); | |
2401 | lockres->l_action = OCFS2_AST_INVALID; | |
2402 | break; | |
2403 | case OCFS2_UNLOCK_DROP_LOCK: | |
2404 | lockres->l_level = LKM_IVMODE; | |
2405 | break; | |
2406 | default: | |
2407 | BUG(); | |
2408 | } | |
2409 | ||
2410 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
2411 | complete_unlock: | |
2412 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
2413 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2414 | ||
2415 | wake_up(&lockres->l_event); | |
2416 | ||
2417 | mlog_exit_void(); | |
2418 | } | |
2419 | ||
ccd979bd | 2420 | static int ocfs2_drop_lock(struct ocfs2_super *osb, |
0d5dc6c2 | 2421 | struct ocfs2_lock_res *lockres) |
ccd979bd MF |
2422 | { |
2423 | enum dlm_status status; | |
2424 | unsigned long flags; | |
b80fc012 | 2425 | int lkm_flags = 0; |
ccd979bd MF |
2426 | |
2427 | /* We didn't get anywhere near actually using this lockres. */ | |
2428 | if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) | |
2429 | goto out; | |
2430 | ||
b80fc012 MF |
2431 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
2432 | lkm_flags |= LKM_VALBLK; | |
2433 | ||
ccd979bd MF |
2434 | spin_lock_irqsave(&lockres->l_lock, flags); |
2435 | ||
2436 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING), | |
2437 | "lockres %s, flags 0x%lx\n", | |
2438 | lockres->l_name, lockres->l_flags); | |
2439 | ||
2440 | while (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
2441 | mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = " | |
2442 | "%u, unlock_action = %u\n", | |
2443 | lockres->l_name, lockres->l_flags, lockres->l_action, | |
2444 | lockres->l_unlock_action); | |
2445 | ||
2446 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2447 | ||
2448 | /* XXX: Today we just wait on any busy | |
2449 | * locks... Perhaps we need to cancel converts in the | |
2450 | * future? */ | |
2451 | ocfs2_wait_on_busy_lock(lockres); | |
2452 | ||
2453 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2454 | } | |
2455 | ||
0d5dc6c2 MF |
2456 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) { |
2457 | if (lockres->l_flags & OCFS2_LOCK_ATTACHED && | |
2458 | lockres->l_level == LKM_EXMODE && | |
2459 | !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) | |
2460 | lockres->l_ops->set_lvb(lockres); | |
2461 | } | |
ccd979bd MF |
2462 | |
2463 | if (lockres->l_flags & OCFS2_LOCK_BUSY) | |
2464 | mlog(ML_ERROR, "destroying busy lock: \"%s\"\n", | |
2465 | lockres->l_name); | |
2466 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) | |
2467 | mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name); | |
2468 | ||
2469 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { | |
2470 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2471 | goto out; | |
2472 | } | |
2473 | ||
2474 | lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED); | |
2475 | ||
2476 | /* make sure we never get here while waiting for an ast to | |
2477 | * fire. */ | |
2478 | BUG_ON(lockres->l_action != OCFS2_AST_INVALID); | |
2479 | ||
2480 | /* is this necessary? */ | |
2481 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
2482 | lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK; | |
2483 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2484 | ||
2485 | mlog(0, "lock %s\n", lockres->l_name); | |
2486 | ||
b80fc012 | 2487 | status = dlmunlock(osb->dlm, &lockres->l_lksb, lkm_flags, |
2a45f2d1 | 2488 | ocfs2_unlock_ast, lockres); |
ccd979bd MF |
2489 | if (status != DLM_NORMAL) { |
2490 | ocfs2_log_dlm_error("dlmunlock", status, lockres); | |
2491 | mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags); | |
2492 | dlm_print_one_lock(lockres->l_lksb.lockid); | |
2493 | BUG(); | |
2494 | } | |
2495 | mlog(0, "lock %s, successfull return from dlmunlock\n", | |
2496 | lockres->l_name); | |
2497 | ||
2498 | ocfs2_wait_on_busy_lock(lockres); | |
2499 | out: | |
2500 | mlog_exit(0); | |
2501 | return 0; | |
2502 | } | |
2503 | ||
2504 | /* Mark the lockres as being dropped. It will no longer be | |
2505 | * queued if blocking, but we still may have to wait on it | |
2506 | * being dequeued from the vote thread before we can consider | |
2507 | * it safe to drop. | |
2508 | * | |
2509 | * You can *not* attempt to call cluster_lock on this lockres anymore. */ | |
2510 | void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres) | |
2511 | { | |
2512 | int status; | |
2513 | struct ocfs2_mask_waiter mw; | |
2514 | unsigned long flags; | |
2515 | ||
2516 | ocfs2_init_mask_waiter(&mw); | |
2517 | ||
2518 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2519 | lockres->l_flags |= OCFS2_LOCK_FREEING; | |
2520 | while (lockres->l_flags & OCFS2_LOCK_QUEUED) { | |
2521 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0); | |
2522 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2523 | ||
2524 | mlog(0, "Waiting on lockres %s\n", lockres->l_name); | |
2525 | ||
2526 | status = ocfs2_wait_for_mask(&mw); | |
2527 | if (status) | |
2528 | mlog_errno(status); | |
2529 | ||
2530 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2531 | } | |
2532 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2533 | } | |
2534 | ||
d680efe9 MF |
2535 | void ocfs2_simple_drop_lockres(struct ocfs2_super *osb, |
2536 | struct ocfs2_lock_res *lockres) | |
ccd979bd | 2537 | { |
d680efe9 | 2538 | int ret; |
ccd979bd | 2539 | |
d680efe9 | 2540 | ocfs2_mark_lockres_freeing(lockres); |
0d5dc6c2 | 2541 | ret = ocfs2_drop_lock(osb, lockres); |
d680efe9 MF |
2542 | if (ret) |
2543 | mlog_errno(ret); | |
2544 | } | |
ccd979bd | 2545 | |
d680efe9 MF |
2546 | static void ocfs2_drop_osb_locks(struct ocfs2_super *osb) |
2547 | { | |
2548 | ocfs2_simple_drop_lockres(osb, &osb->osb_super_lockres); | |
2549 | ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres); | |
ccd979bd MF |
2550 | } |
2551 | ||
ccd979bd MF |
2552 | int ocfs2_drop_inode_locks(struct inode *inode) |
2553 | { | |
2554 | int status, err; | |
ccd979bd MF |
2555 | |
2556 | mlog_entry_void(); | |
2557 | ||
2558 | /* No need to call ocfs2_mark_lockres_freeing here - | |
2559 | * ocfs2_clear_inode has done it for us. */ | |
2560 | ||
2561 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
50008630 | 2562 | &OCFS2_I(inode)->ip_open_lockres); |
ccd979bd MF |
2563 | if (err < 0) |
2564 | mlog_errno(err); | |
2565 | ||
2566 | status = err; | |
2567 | ||
50008630 TY |
2568 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), |
2569 | &OCFS2_I(inode)->ip_data_lockres); | |
2570 | if (err < 0) | |
2571 | mlog_errno(err); | |
2572 | if (err < 0 && !status) | |
2573 | status = err; | |
2574 | ||
ccd979bd | 2575 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), |
0d5dc6c2 | 2576 | &OCFS2_I(inode)->ip_meta_lockres); |
ccd979bd MF |
2577 | if (err < 0) |
2578 | mlog_errno(err); | |
2579 | if (err < 0 && !status) | |
2580 | status = err; | |
2581 | ||
2582 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
0d5dc6c2 | 2583 | &OCFS2_I(inode)->ip_rw_lockres); |
ccd979bd MF |
2584 | if (err < 0) |
2585 | mlog_errno(err); | |
2586 | if (err < 0 && !status) | |
2587 | status = err; | |
2588 | ||
2589 | mlog_exit(status); | |
2590 | return status; | |
2591 | } | |
2592 | ||
2593 | static void ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres, | |
2594 | int new_level) | |
2595 | { | |
2596 | assert_spin_locked(&lockres->l_lock); | |
2597 | ||
2598 | BUG_ON(lockres->l_blocking <= LKM_NLMODE); | |
2599 | ||
2600 | if (lockres->l_level <= new_level) { | |
2601 | mlog(ML_ERROR, "lockres->l_level (%u) <= new_level (%u)\n", | |
2602 | lockres->l_level, new_level); | |
2603 | BUG(); | |
2604 | } | |
2605 | ||
2606 | mlog(0, "lock %s, new_level = %d, l_blocking = %d\n", | |
2607 | lockres->l_name, new_level, lockres->l_blocking); | |
2608 | ||
2609 | lockres->l_action = OCFS2_AST_DOWNCONVERT; | |
2610 | lockres->l_requested = new_level; | |
2611 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
2612 | } | |
2613 | ||
2614 | static int ocfs2_downconvert_lock(struct ocfs2_super *osb, | |
2615 | struct ocfs2_lock_res *lockres, | |
2616 | int new_level, | |
2617 | int lvb) | |
2618 | { | |
2619 | int ret, dlm_flags = LKM_CONVERT; | |
2620 | enum dlm_status status; | |
2621 | ||
2622 | mlog_entry_void(); | |
2623 | ||
2624 | if (lvb) | |
2625 | dlm_flags |= LKM_VALBLK; | |
2626 | ||
2627 | status = dlmlock(osb->dlm, | |
2628 | new_level, | |
2629 | &lockres->l_lksb, | |
2630 | dlm_flags, | |
2631 | lockres->l_name, | |
f0681062 | 2632 | OCFS2_LOCK_ID_MAX_LEN - 1, |
e92d57df | 2633 | ocfs2_locking_ast, |
ccd979bd | 2634 | lockres, |
aa2623ad | 2635 | ocfs2_blocking_ast); |
ccd979bd MF |
2636 | if (status != DLM_NORMAL) { |
2637 | ocfs2_log_dlm_error("dlmlock", status, lockres); | |
2638 | ret = -EINVAL; | |
2639 | ocfs2_recover_from_dlm_error(lockres, 1); | |
2640 | goto bail; | |
2641 | } | |
2642 | ||
2643 | ret = 0; | |
2644 | bail: | |
2645 | mlog_exit(ret); | |
2646 | return ret; | |
2647 | } | |
2648 | ||
2649 | /* returns 1 when the caller should unlock and call dlmunlock */ | |
2650 | static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb, | |
2651 | struct ocfs2_lock_res *lockres) | |
2652 | { | |
2653 | assert_spin_locked(&lockres->l_lock); | |
2654 | ||
2655 | mlog_entry_void(); | |
2656 | mlog(0, "lock %s\n", lockres->l_name); | |
2657 | ||
2658 | if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { | |
2659 | /* If we're already trying to cancel a lock conversion | |
2660 | * then just drop the spinlock and allow the caller to | |
2661 | * requeue this lock. */ | |
2662 | ||
2663 | mlog(0, "Lockres %s, skip convert\n", lockres->l_name); | |
2664 | return 0; | |
2665 | } | |
2666 | ||
2667 | /* were we in a convert when we got the bast fire? */ | |
2668 | BUG_ON(lockres->l_action != OCFS2_AST_CONVERT && | |
2669 | lockres->l_action != OCFS2_AST_DOWNCONVERT); | |
2670 | /* set things up for the unlockast to know to just | |
2671 | * clear out the ast_action and unset busy, etc. */ | |
2672 | lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT; | |
2673 | ||
2674 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY), | |
2675 | "lock %s, invalid flags: 0x%lx\n", | |
2676 | lockres->l_name, lockres->l_flags); | |
2677 | ||
2678 | return 1; | |
2679 | } | |
2680 | ||
2681 | static int ocfs2_cancel_convert(struct ocfs2_super *osb, | |
2682 | struct ocfs2_lock_res *lockres) | |
2683 | { | |
2684 | int ret; | |
2685 | enum dlm_status status; | |
2686 | ||
2687 | mlog_entry_void(); | |
2688 | mlog(0, "lock %s\n", lockres->l_name); | |
2689 | ||
2690 | ret = 0; | |
2691 | status = dlmunlock(osb->dlm, | |
2692 | &lockres->l_lksb, | |
2693 | LKM_CANCEL, | |
2a45f2d1 | 2694 | ocfs2_unlock_ast, |
ccd979bd MF |
2695 | lockres); |
2696 | if (status != DLM_NORMAL) { | |
2697 | ocfs2_log_dlm_error("dlmunlock", status, lockres); | |
2698 | ret = -EINVAL; | |
2699 | ocfs2_recover_from_dlm_error(lockres, 0); | |
2700 | } | |
2701 | ||
2702 | mlog(0, "lock %s return from dlmunlock\n", lockres->l_name); | |
2703 | ||
ccd979bd MF |
2704 | mlog_exit(ret); |
2705 | return ret; | |
2706 | } | |
2707 | ||
b5e500e2 MF |
2708 | static int ocfs2_unblock_lock(struct ocfs2_super *osb, |
2709 | struct ocfs2_lock_res *lockres, | |
2710 | struct ocfs2_unblock_ctl *ctl) | |
ccd979bd MF |
2711 | { |
2712 | unsigned long flags; | |
2713 | int blocking; | |
2714 | int new_level; | |
2715 | int ret = 0; | |
5ef0d4ea | 2716 | int set_lvb = 0; |
ccd979bd MF |
2717 | |
2718 | mlog_entry_void(); | |
2719 | ||
2720 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2721 | ||
2722 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
2723 | ||
2724 | recheck: | |
2725 | if (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
d680efe9 | 2726 | ctl->requeue = 1; |
ccd979bd MF |
2727 | ret = ocfs2_prepare_cancel_convert(osb, lockres); |
2728 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2729 | if (ret) { | |
2730 | ret = ocfs2_cancel_convert(osb, lockres); | |
2731 | if (ret < 0) | |
2732 | mlog_errno(ret); | |
2733 | } | |
2734 | goto leave; | |
2735 | } | |
2736 | ||
2737 | /* if we're blocking an exclusive and we have *any* holders, | |
2738 | * then requeue. */ | |
2739 | if ((lockres->l_blocking == LKM_EXMODE) | |
f7fbfdd1 MF |
2740 | && (lockres->l_ex_holders || lockres->l_ro_holders)) |
2741 | goto leave_requeue; | |
ccd979bd MF |
2742 | |
2743 | /* If it's a PR we're blocking, then only | |
2744 | * requeue if we've got any EX holders */ | |
2745 | if (lockres->l_blocking == LKM_PRMODE && | |
f7fbfdd1 MF |
2746 | lockres->l_ex_holders) |
2747 | goto leave_requeue; | |
2748 | ||
2749 | /* | |
2750 | * Can we get a lock in this state if the holder counts are | |
2751 | * zero? The meta data unblock code used to check this. | |
2752 | */ | |
2753 | if ((lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) | |
2754 | && (lockres->l_flags & OCFS2_LOCK_REFRESHING)) | |
2755 | goto leave_requeue; | |
ccd979bd | 2756 | |
16d5b956 MF |
2757 | new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking); |
2758 | ||
2759 | if (lockres->l_ops->check_downconvert | |
2760 | && !lockres->l_ops->check_downconvert(lockres, new_level)) | |
2761 | goto leave_requeue; | |
2762 | ||
ccd979bd MF |
2763 | /* If we get here, then we know that there are no more |
2764 | * incompatible holders (and anyone asking for an incompatible | |
2765 | * lock is blocked). We can now downconvert the lock */ | |
cc567d89 | 2766 | if (!lockres->l_ops->downconvert_worker) |
ccd979bd MF |
2767 | goto downconvert; |
2768 | ||
2769 | /* Some lockres types want to do a bit of work before | |
2770 | * downconverting a lock. Allow that here. The worker function | |
2771 | * may sleep, so we save off a copy of what we're blocking as | |
2772 | * it may change while we're not holding the spin lock. */ | |
2773 | blocking = lockres->l_blocking; | |
2774 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2775 | ||
cc567d89 | 2776 | ctl->unblock_action = lockres->l_ops->downconvert_worker(lockres, blocking); |
d680efe9 MF |
2777 | |
2778 | if (ctl->unblock_action == UNBLOCK_STOP_POST) | |
2779 | goto leave; | |
ccd979bd MF |
2780 | |
2781 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2782 | if (blocking != lockres->l_blocking) { | |
2783 | /* If this changed underneath us, then we can't drop | |
2784 | * it just yet. */ | |
2785 | goto recheck; | |
2786 | } | |
2787 | ||
2788 | downconvert: | |
d680efe9 | 2789 | ctl->requeue = 0; |
ccd979bd | 2790 | |
5ef0d4ea MF |
2791 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) { |
2792 | if (lockres->l_level == LKM_EXMODE) | |
2793 | set_lvb = 1; | |
2794 | ||
2795 | /* | |
2796 | * We only set the lvb if the lock has been fully | |
2797 | * refreshed - otherwise we risk setting stale | |
2798 | * data. Otherwise, there's no need to actually clear | |
2799 | * out the lvb here as it's value is still valid. | |
2800 | */ | |
2801 | if (set_lvb && !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) | |
2802 | lockres->l_ops->set_lvb(lockres); | |
2803 | } | |
2804 | ||
ccd979bd MF |
2805 | ocfs2_prepare_downconvert(lockres, new_level); |
2806 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
5ef0d4ea | 2807 | ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb); |
ccd979bd MF |
2808 | leave: |
2809 | mlog_exit(ret); | |
2810 | return ret; | |
f7fbfdd1 MF |
2811 | |
2812 | leave_requeue: | |
2813 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2814 | ctl->requeue = 1; | |
2815 | ||
2816 | mlog_exit(0); | |
2817 | return 0; | |
ccd979bd MF |
2818 | } |
2819 | ||
d680efe9 MF |
2820 | static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, |
2821 | int blocking) | |
ccd979bd MF |
2822 | { |
2823 | struct inode *inode; | |
2824 | struct address_space *mapping; | |
2825 | ||
ccd979bd MF |
2826 | inode = ocfs2_lock_res_inode(lockres); |
2827 | mapping = inode->i_mapping; | |
2828 | ||
7f4a2a97 MF |
2829 | /* |
2830 | * We need this before the filemap_fdatawrite() so that it can | |
2831 | * transfer the dirty bit from the PTE to the | |
2832 | * page. Unfortunately this means that even for EX->PR | |
2833 | * downconverts, we'll lose our mappings and have to build | |
2834 | * them up again. | |
2835 | */ | |
2836 | unmap_mapping_range(mapping, 0, 0, 0); | |
2837 | ||
ccd979bd | 2838 | if (filemap_fdatawrite(mapping)) { |
b0697053 MF |
2839 | mlog(ML_ERROR, "Could not sync inode %llu for downconvert!", |
2840 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
ccd979bd MF |
2841 | } |
2842 | sync_mapping_buffers(mapping); | |
2843 | if (blocking == LKM_EXMODE) { | |
2844 | truncate_inode_pages(mapping, 0); | |
ccd979bd MF |
2845 | } else { |
2846 | /* We only need to wait on the I/O if we're not also | |
2847 | * truncating pages because truncate_inode_pages waits | |
2848 | * for us above. We don't truncate pages if we're | |
2849 | * blocking anything < EXMODE because we want to keep | |
2850 | * them around in that case. */ | |
2851 | filemap_fdatawait(mapping); | |
2852 | } | |
2853 | ||
d680efe9 | 2854 | return UNBLOCK_CONTINUE; |
ccd979bd MF |
2855 | } |
2856 | ||
810d5aeb MF |
2857 | static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres, |
2858 | int new_level) | |
2859 | { | |
2860 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
2861 | int checkpointed = ocfs2_inode_fully_checkpointed(inode); | |
2862 | ||
2863 | BUG_ON(new_level != LKM_NLMODE && new_level != LKM_PRMODE); | |
2864 | BUG_ON(lockres->l_level != LKM_EXMODE && !checkpointed); | |
2865 | ||
2866 | if (checkpointed) | |
2867 | return 1; | |
2868 | ||
2869 | ocfs2_start_checkpoint(OCFS2_SB(inode->i_sb)); | |
2870 | return 0; | |
2871 | } | |
2872 | ||
2873 | static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres) | |
2874 | { | |
2875 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
2876 | ||
2877 | __ocfs2_stuff_meta_lvb(inode); | |
2878 | } | |
2879 | ||
d680efe9 MF |
2880 | /* |
2881 | * Does the final reference drop on our dentry lock. Right now this | |
2882 | * happens in the vote thread, but we could choose to simplify the | |
2883 | * dlmglue API and push these off to the ocfs2_wq in the future. | |
2884 | */ | |
2885 | static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, | |
2886 | struct ocfs2_lock_res *lockres) | |
2887 | { | |
2888 | struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); | |
2889 | ocfs2_dentry_lock_put(osb, dl); | |
2890 | } | |
2891 | ||
2892 | /* | |
2893 | * d_delete() matching dentries before the lock downconvert. | |
2894 | * | |
2895 | * At this point, any process waiting to destroy the | |
2896 | * dentry_lock due to last ref count is stopped by the | |
2897 | * OCFS2_LOCK_QUEUED flag. | |
2898 | * | |
2899 | * We have two potential problems | |
2900 | * | |
2901 | * 1) If we do the last reference drop on our dentry_lock (via dput) | |
2902 | * we'll wind up in ocfs2_release_dentry_lock(), waiting on | |
2903 | * the downconvert to finish. Instead we take an elevated | |
2904 | * reference and push the drop until after we've completed our | |
2905 | * unblock processing. | |
2906 | * | |
2907 | * 2) There might be another process with a final reference, | |
2908 | * waiting on us to finish processing. If this is the case, we | |
2909 | * detect it and exit out - there's no more dentries anyway. | |
2910 | */ | |
2911 | static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, | |
2912 | int blocking) | |
2913 | { | |
2914 | struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); | |
2915 | struct ocfs2_inode_info *oi = OCFS2_I(dl->dl_inode); | |
2916 | struct dentry *dentry; | |
2917 | unsigned long flags; | |
2918 | int extra_ref = 0; | |
2919 | ||
2920 | /* | |
2921 | * This node is blocking another node from getting a read | |
2922 | * lock. This happens when we've renamed within a | |
2923 | * directory. We've forced the other nodes to d_delete(), but | |
2924 | * we never actually dropped our lock because it's still | |
2925 | * valid. The downconvert code will retain a PR for this node, | |
2926 | * so there's no further work to do. | |
2927 | */ | |
2928 | if (blocking == LKM_PRMODE) | |
2929 | return UNBLOCK_CONTINUE; | |
2930 | ||
2931 | /* | |
2932 | * Mark this inode as potentially orphaned. The code in | |
2933 | * ocfs2_delete_inode() will figure out whether it actually | |
2934 | * needs to be freed or not. | |
2935 | */ | |
2936 | spin_lock(&oi->ip_lock); | |
2937 | oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED; | |
2938 | spin_unlock(&oi->ip_lock); | |
2939 | ||
2940 | /* | |
2941 | * Yuck. We need to make sure however that the check of | |
2942 | * OCFS2_LOCK_FREEING and the extra reference are atomic with | |
2943 | * respect to a reference decrement or the setting of that | |
2944 | * flag. | |
2945 | */ | |
2946 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2947 | spin_lock(&dentry_attach_lock); | |
2948 | if (!(lockres->l_flags & OCFS2_LOCK_FREEING) | |
2949 | && dl->dl_count) { | |
2950 | dl->dl_count++; | |
2951 | extra_ref = 1; | |
2952 | } | |
2953 | spin_unlock(&dentry_attach_lock); | |
2954 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2955 | ||
2956 | mlog(0, "extra_ref = %d\n", extra_ref); | |
2957 | ||
2958 | /* | |
2959 | * We have a process waiting on us in ocfs2_dentry_iput(), | |
2960 | * which means we can't have any more outstanding | |
2961 | * aliases. There's no need to do any more work. | |
2962 | */ | |
2963 | if (!extra_ref) | |
2964 | return UNBLOCK_CONTINUE; | |
2965 | ||
2966 | spin_lock(&dentry_attach_lock); | |
2967 | while (1) { | |
2968 | dentry = ocfs2_find_local_alias(dl->dl_inode, | |
2969 | dl->dl_parent_blkno, 1); | |
2970 | if (!dentry) | |
2971 | break; | |
2972 | spin_unlock(&dentry_attach_lock); | |
2973 | ||
2974 | mlog(0, "d_delete(%.*s);\n", dentry->d_name.len, | |
2975 | dentry->d_name.name); | |
2976 | ||
2977 | /* | |
2978 | * The following dcache calls may do an | |
2979 | * iput(). Normally we don't want that from the | |
2980 | * downconverting thread, but in this case it's ok | |
2981 | * because the requesting node already has an | |
2982 | * exclusive lock on the inode, so it can't be queued | |
2983 | * for a downconvert. | |
2984 | */ | |
2985 | d_delete(dentry); | |
2986 | dput(dentry); | |
2987 | ||
2988 | spin_lock(&dentry_attach_lock); | |
2989 | } | |
2990 | spin_unlock(&dentry_attach_lock); | |
2991 | ||
2992 | /* | |
2993 | * If we are the last holder of this dentry lock, there is no | |
2994 | * reason to downconvert so skip straight to the unlock. | |
2995 | */ | |
2996 | if (dl->dl_count == 1) | |
2997 | return UNBLOCK_STOP_POST; | |
2998 | ||
2999 | return UNBLOCK_CONTINUE_POST; | |
3000 | } | |
3001 | ||
ccd979bd MF |
3002 | void ocfs2_process_blocked_lock(struct ocfs2_super *osb, |
3003 | struct ocfs2_lock_res *lockres) | |
3004 | { | |
3005 | int status; | |
d680efe9 | 3006 | struct ocfs2_unblock_ctl ctl = {0, 0,}; |
ccd979bd MF |
3007 | unsigned long flags; |
3008 | ||
3009 | /* Our reference to the lockres in this function can be | |
3010 | * considered valid until we remove the OCFS2_LOCK_QUEUED | |
3011 | * flag. */ | |
3012 | ||
3013 | mlog_entry_void(); | |
3014 | ||
3015 | BUG_ON(!lockres); | |
3016 | BUG_ON(!lockres->l_ops); | |
ccd979bd MF |
3017 | |
3018 | mlog(0, "lockres %s blocked.\n", lockres->l_name); | |
3019 | ||
3020 | /* Detect whether a lock has been marked as going away while | |
3021 | * the vote thread was processing other things. A lock can | |
3022 | * still be marked with OCFS2_LOCK_FREEING after this check, | |
3023 | * but short circuiting here will still save us some | |
3024 | * performance. */ | |
3025 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3026 | if (lockres->l_flags & OCFS2_LOCK_FREEING) | |
3027 | goto unqueue; | |
3028 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3029 | ||
b5e500e2 | 3030 | status = ocfs2_unblock_lock(osb, lockres, &ctl); |
ccd979bd MF |
3031 | if (status < 0) |
3032 | mlog_errno(status); | |
3033 | ||
3034 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3035 | unqueue: | |
d680efe9 | 3036 | if (lockres->l_flags & OCFS2_LOCK_FREEING || !ctl.requeue) { |
ccd979bd MF |
3037 | lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED); |
3038 | } else | |
3039 | ocfs2_schedule_blocked_lock(osb, lockres); | |
3040 | ||
3041 | mlog(0, "lockres %s, requeue = %s.\n", lockres->l_name, | |
d680efe9 | 3042 | ctl.requeue ? "yes" : "no"); |
ccd979bd MF |
3043 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
3044 | ||
d680efe9 MF |
3045 | if (ctl.unblock_action != UNBLOCK_CONTINUE |
3046 | && lockres->l_ops->post_unlock) | |
3047 | lockres->l_ops->post_unlock(osb, lockres); | |
3048 | ||
ccd979bd MF |
3049 | mlog_exit_void(); |
3050 | } | |
3051 | ||
3052 | static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, | |
3053 | struct ocfs2_lock_res *lockres) | |
3054 | { | |
3055 | mlog_entry_void(); | |
3056 | ||
3057 | assert_spin_locked(&lockres->l_lock); | |
3058 | ||
3059 | if (lockres->l_flags & OCFS2_LOCK_FREEING) { | |
3060 | /* Do not schedule a lock for downconvert when it's on | |
3061 | * the way to destruction - any nodes wanting access | |
3062 | * to the resource will get it soon. */ | |
3063 | mlog(0, "Lockres %s won't be scheduled: flags 0x%lx\n", | |
3064 | lockres->l_name, lockres->l_flags); | |
3065 | return; | |
3066 | } | |
3067 | ||
3068 | lockres_or_flags(lockres, OCFS2_LOCK_QUEUED); | |
3069 | ||
3070 | spin_lock(&osb->vote_task_lock); | |
3071 | if (list_empty(&lockres->l_blocked_list)) { | |
3072 | list_add_tail(&lockres->l_blocked_list, | |
3073 | &osb->blocked_lock_list); | |
3074 | osb->blocked_lock_count++; | |
3075 | } | |
3076 | spin_unlock(&osb->vote_task_lock); | |
3077 | ||
3078 | mlog_exit_void(); | |
3079 | } | |
3080 | ||
3081 | /* This aids in debugging situations where a bad LVB might be involved. */ | |
3082 | void ocfs2_dump_meta_lvb_info(u64 level, | |
3083 | const char *function, | |
3084 | unsigned int line, | |
3085 | struct ocfs2_lock_res *lockres) | |
3086 | { | |
3087 | struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; | |
3088 | ||
3089 | mlog(level, "LVB information for %s (called from %s:%u):\n", | |
3090 | lockres->l_name, function, line); | |
f9e2d82e MF |
3091 | mlog(level, "version: %u, clusters: %u, generation: 0x%x\n", |
3092 | lvb->lvb_version, be32_to_cpu(lvb->lvb_iclusters), | |
3093 | be32_to_cpu(lvb->lvb_igeneration)); | |
b0697053 MF |
3094 | mlog(level, "size: %llu, uid %u, gid %u, mode 0x%x\n", |
3095 | (unsigned long long)be64_to_cpu(lvb->lvb_isize), | |
3096 | be32_to_cpu(lvb->lvb_iuid), be32_to_cpu(lvb->lvb_igid), | |
3097 | be16_to_cpu(lvb->lvb_imode)); | |
3098 | mlog(level, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, " | |
ca4d147e | 3099 | "mtime_packed 0x%llx iattr 0x%x\n", be16_to_cpu(lvb->lvb_inlink), |
b0697053 MF |
3100 | (long long)be64_to_cpu(lvb->lvb_iatime_packed), |
3101 | (long long)be64_to_cpu(lvb->lvb_ictime_packed), | |
ca4d147e HP |
3102 | (long long)be64_to_cpu(lvb->lvb_imtime_packed), |
3103 | be32_to_cpu(lvb->lvb_iattr)); | |
ccd979bd | 3104 | } |