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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" | |
52 | #include "heartbeat.h" | |
53 | #include "inode.h" | |
54 | #include "journal.h" | |
55 | #include "slot_map.h" | |
56 | #include "super.h" | |
57 | #include "uptodate.h" | |
58 | #include "vote.h" | |
59 | ||
60 | #include "buffer_head_io.h" | |
61 | ||
62 | struct ocfs2_mask_waiter { | |
63 | struct list_head mw_item; | |
64 | int mw_status; | |
65 | struct completion mw_complete; | |
66 | unsigned long mw_mask; | |
67 | unsigned long mw_goal; | |
68 | }; | |
69 | ||
54a7e755 MF |
70 | static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres); |
71 | static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres); | |
ccd979bd | 72 | |
d680efe9 MF |
73 | /* |
74 | * Return value from ocfs2_convert_worker_t functions. | |
75 | * | |
76 | * These control the precise actions of ocfs2_generic_unblock_lock() | |
77 | * and ocfs2_process_blocked_lock() | |
78 | * | |
79 | */ | |
80 | enum ocfs2_unblock_action { | |
81 | UNBLOCK_CONTINUE = 0, /* Continue downconvert */ | |
82 | UNBLOCK_CONTINUE_POST = 1, /* Continue downconvert, fire | |
83 | * ->post_unlock callback */ | |
84 | UNBLOCK_STOP_POST = 2, /* Do not downconvert, fire | |
85 | * ->post_unlock() callback. */ | |
86 | }; | |
87 | ||
88 | struct ocfs2_unblock_ctl { | |
89 | int requeue; | |
90 | enum ocfs2_unblock_action unblock_action; | |
91 | }; | |
92 | ||
ccd979bd | 93 | static int ocfs2_unblock_meta(struct ocfs2_lock_res *lockres, |
d680efe9 | 94 | struct ocfs2_unblock_ctl *ctl); |
ccd979bd | 95 | static int ocfs2_unblock_data(struct ocfs2_lock_res *lockres, |
d680efe9 | 96 | struct ocfs2_unblock_ctl *ctl); |
ccd979bd | 97 | static int ocfs2_unblock_inode_lock(struct ocfs2_lock_res *lockres, |
d680efe9 MF |
98 | struct ocfs2_unblock_ctl *ctl); |
99 | static int ocfs2_unblock_dentry_lock(struct ocfs2_lock_res *lockres, | |
100 | struct ocfs2_unblock_ctl *ctl); | |
ccd979bd | 101 | static int ocfs2_unblock_osb_lock(struct ocfs2_lock_res *lockres, |
d680efe9 MF |
102 | struct ocfs2_unblock_ctl *ctl); |
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. | |
111 | */ | |
ccd979bd | 112 | struct ocfs2_lock_res_ops { |
54a7e755 MF |
113 | /* |
114 | * Translate an ocfs2_lock_res * into an ocfs2_super *. Define | |
115 | * this callback if ->l_priv is not an ocfs2_super pointer | |
116 | */ | |
117 | struct ocfs2_super * (*get_osb)(struct ocfs2_lock_res *); | |
d680efe9 MF |
118 | int (*unblock)(struct ocfs2_lock_res *, struct ocfs2_unblock_ctl *); |
119 | void (*post_unlock)(struct ocfs2_super *, struct ocfs2_lock_res *); | |
f625c979 | 120 | |
16d5b956 MF |
121 | /* |
122 | * Allow a lock type to add checks to determine whether it is | |
123 | * safe to downconvert a lock. Return 0 to re-queue the | |
124 | * downconvert at a later time, nonzero to continue. | |
125 | * | |
126 | * For most locks, the default checks that there are no | |
127 | * incompatible holders are sufficient. | |
128 | * | |
129 | * Called with the lockres spinlock held. | |
130 | */ | |
131 | int (*check_downconvert)(struct ocfs2_lock_res *, int); | |
132 | ||
f625c979 MF |
133 | /* |
134 | * LOCK_TYPE_* flags which describe the specific requirements | |
135 | * of a lock type. Descriptions of each individual flag follow. | |
136 | */ | |
137 | int flags; | |
ccd979bd MF |
138 | }; |
139 | ||
f625c979 MF |
140 | /* |
141 | * Some locks want to "refresh" potentially stale data when a | |
142 | * meaningful (PRMODE or EXMODE) lock level is first obtained. If this | |
143 | * flag is set, the OCFS2_LOCK_NEEDS_REFRESH flag will be set on the | |
144 | * individual lockres l_flags member from the ast function. It is | |
145 | * expected that the locking wrapper will clear the | |
146 | * OCFS2_LOCK_NEEDS_REFRESH flag when done. | |
147 | */ | |
148 | #define LOCK_TYPE_REQUIRES_REFRESH 0x1 | |
149 | ||
b80fc012 MF |
150 | /* |
151 | * Indicate that a lock type makes use of the lock value block. | |
152 | */ | |
153 | #define LOCK_TYPE_USES_LVB 0x2 | |
154 | ||
d680efe9 MF |
155 | typedef int (ocfs2_convert_worker_t)(struct ocfs2_lock_res *, int); |
156 | static int ocfs2_generic_unblock_lock(struct ocfs2_super *osb, | |
157 | struct ocfs2_lock_res *lockres, | |
158 | struct ocfs2_unblock_ctl *ctl, | |
159 | ocfs2_convert_worker_t *worker); | |
160 | ||
ccd979bd | 161 | static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = { |
54a7e755 | 162 | .get_osb = ocfs2_get_inode_osb, |
ccd979bd | 163 | .unblock = ocfs2_unblock_inode_lock, |
f625c979 | 164 | .flags = 0, |
ccd979bd MF |
165 | }; |
166 | ||
167 | static struct ocfs2_lock_res_ops ocfs2_inode_meta_lops = { | |
54a7e755 | 168 | .get_osb = ocfs2_get_inode_osb, |
ccd979bd | 169 | .unblock = ocfs2_unblock_meta, |
b80fc012 | 170 | .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB, |
ccd979bd MF |
171 | }; |
172 | ||
ccd979bd | 173 | static struct ocfs2_lock_res_ops ocfs2_inode_data_lops = { |
54a7e755 | 174 | .get_osb = ocfs2_get_inode_osb, |
ccd979bd | 175 | .unblock = ocfs2_unblock_data, |
f625c979 | 176 | .flags = 0, |
ccd979bd MF |
177 | }; |
178 | ||
179 | static struct ocfs2_lock_res_ops ocfs2_super_lops = { | |
ccd979bd | 180 | .unblock = ocfs2_unblock_osb_lock, |
f625c979 | 181 | .flags = LOCK_TYPE_REQUIRES_REFRESH, |
ccd979bd MF |
182 | }; |
183 | ||
184 | static struct ocfs2_lock_res_ops ocfs2_rename_lops = { | |
ccd979bd | 185 | .unblock = ocfs2_unblock_osb_lock, |
f625c979 | 186 | .flags = 0, |
ccd979bd MF |
187 | }; |
188 | ||
d680efe9 | 189 | static struct ocfs2_lock_res_ops ocfs2_dentry_lops = { |
54a7e755 | 190 | .get_osb = ocfs2_get_dentry_osb, |
d680efe9 MF |
191 | .unblock = ocfs2_unblock_dentry_lock, |
192 | .post_unlock = ocfs2_dentry_post_unlock, | |
f625c979 | 193 | .flags = 0, |
d680efe9 MF |
194 | }; |
195 | ||
ccd979bd MF |
196 | static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres) |
197 | { | |
198 | return lockres->l_type == OCFS2_LOCK_TYPE_META || | |
199 | lockres->l_type == OCFS2_LOCK_TYPE_DATA || | |
200 | lockres->l_type == OCFS2_LOCK_TYPE_RW; | |
201 | } | |
202 | ||
ccd979bd MF |
203 | static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres) |
204 | { | |
205 | BUG_ON(!ocfs2_is_inode_lock(lockres)); | |
206 | ||
207 | return (struct inode *) lockres->l_priv; | |
208 | } | |
209 | ||
d680efe9 MF |
210 | static inline struct ocfs2_dentry_lock *ocfs2_lock_res_dl(struct ocfs2_lock_res *lockres) |
211 | { | |
212 | BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_DENTRY); | |
213 | ||
214 | return (struct ocfs2_dentry_lock *)lockres->l_priv; | |
215 | } | |
216 | ||
54a7e755 MF |
217 | static inline struct ocfs2_super *ocfs2_get_lockres_osb(struct ocfs2_lock_res *lockres) |
218 | { | |
219 | if (lockres->l_ops->get_osb) | |
220 | return lockres->l_ops->get_osb(lockres); | |
221 | ||
222 | return (struct ocfs2_super *)lockres->l_priv; | |
223 | } | |
224 | ||
ccd979bd MF |
225 | static int ocfs2_lock_create(struct ocfs2_super *osb, |
226 | struct ocfs2_lock_res *lockres, | |
227 | int level, | |
228 | int dlm_flags); | |
229 | static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, | |
230 | int wanted); | |
231 | static void ocfs2_cluster_unlock(struct ocfs2_super *osb, | |
232 | struct ocfs2_lock_res *lockres, | |
233 | int level); | |
234 | static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres); | |
235 | static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres); | |
236 | static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres); | |
237 | static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, int level); | |
238 | static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, | |
239 | struct ocfs2_lock_res *lockres); | |
240 | static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, | |
241 | int convert); | |
242 | #define ocfs2_log_dlm_error(_func, _stat, _lockres) do { \ | |
243 | mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \ | |
244 | "resource %s: %s\n", dlm_errname(_stat), _func, \ | |
245 | _lockres->l_name, dlm_errmsg(_stat)); \ | |
246 | } while (0) | |
247 | static void ocfs2_vote_on_unlock(struct ocfs2_super *osb, | |
248 | struct ocfs2_lock_res *lockres); | |
249 | static int ocfs2_meta_lock_update(struct inode *inode, | |
250 | struct buffer_head **bh); | |
251 | static void ocfs2_drop_osb_locks(struct ocfs2_super *osb); | |
252 | static inline int ocfs2_highest_compat_lock_level(int level); | |
253 | static inline int ocfs2_can_downconvert_meta_lock(struct inode *inode, | |
254 | struct ocfs2_lock_res *lockres, | |
255 | int new_level); | |
256 | ||
ccd979bd MF |
257 | static void ocfs2_build_lock_name(enum ocfs2_lock_type type, |
258 | u64 blkno, | |
259 | u32 generation, | |
260 | char *name) | |
261 | { | |
262 | int len; | |
263 | ||
264 | mlog_entry_void(); | |
265 | ||
266 | BUG_ON(type >= OCFS2_NUM_LOCK_TYPES); | |
267 | ||
b0697053 MF |
268 | len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016llx%08x", |
269 | ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD, | |
270 | (long long)blkno, generation); | |
ccd979bd MF |
271 | |
272 | BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1)); | |
273 | ||
274 | mlog(0, "built lock resource with name: %s\n", name); | |
275 | ||
276 | mlog_exit_void(); | |
277 | } | |
278 | ||
34af946a | 279 | static DEFINE_SPINLOCK(ocfs2_dlm_tracking_lock); |
ccd979bd MF |
280 | |
281 | static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res, | |
282 | struct ocfs2_dlm_debug *dlm_debug) | |
283 | { | |
284 | mlog(0, "Add tracking for lockres %s\n", res->l_name); | |
285 | ||
286 | spin_lock(&ocfs2_dlm_tracking_lock); | |
287 | list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking); | |
288 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
289 | } | |
290 | ||
291 | static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res) | |
292 | { | |
293 | spin_lock(&ocfs2_dlm_tracking_lock); | |
294 | if (!list_empty(&res->l_debug_list)) | |
295 | list_del_init(&res->l_debug_list); | |
296 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
297 | } | |
298 | ||
299 | static void ocfs2_lock_res_init_common(struct ocfs2_super *osb, | |
300 | struct ocfs2_lock_res *res, | |
301 | enum ocfs2_lock_type type, | |
ccd979bd MF |
302 | struct ocfs2_lock_res_ops *ops, |
303 | void *priv) | |
304 | { | |
ccd979bd MF |
305 | res->l_type = type; |
306 | res->l_ops = ops; | |
307 | res->l_priv = priv; | |
308 | ||
309 | res->l_level = LKM_IVMODE; | |
310 | res->l_requested = LKM_IVMODE; | |
311 | res->l_blocking = LKM_IVMODE; | |
312 | res->l_action = OCFS2_AST_INVALID; | |
313 | res->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
314 | ||
315 | res->l_flags = OCFS2_LOCK_INITIALIZED; | |
316 | ||
317 | ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug); | |
318 | } | |
319 | ||
320 | void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res) | |
321 | { | |
322 | /* This also clears out the lock status block */ | |
323 | memset(res, 0, sizeof(struct ocfs2_lock_res)); | |
324 | spin_lock_init(&res->l_lock); | |
325 | init_waitqueue_head(&res->l_event); | |
326 | INIT_LIST_HEAD(&res->l_blocked_list); | |
327 | INIT_LIST_HEAD(&res->l_mask_waiters); | |
328 | } | |
329 | ||
330 | void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res, | |
331 | enum ocfs2_lock_type type, | |
24c19ef4 | 332 | unsigned int generation, |
ccd979bd MF |
333 | struct inode *inode) |
334 | { | |
335 | struct ocfs2_lock_res_ops *ops; | |
336 | ||
337 | switch(type) { | |
338 | case OCFS2_LOCK_TYPE_RW: | |
339 | ops = &ocfs2_inode_rw_lops; | |
340 | break; | |
341 | case OCFS2_LOCK_TYPE_META: | |
342 | ops = &ocfs2_inode_meta_lops; | |
343 | break; | |
344 | case OCFS2_LOCK_TYPE_DATA: | |
345 | ops = &ocfs2_inode_data_lops; | |
346 | break; | |
347 | default: | |
348 | mlog_bug_on_msg(1, "type: %d\n", type); | |
349 | ops = NULL; /* thanks, gcc */ | |
350 | break; | |
351 | }; | |
352 | ||
d680efe9 | 353 | ocfs2_build_lock_name(type, OCFS2_I(inode)->ip_blkno, |
24c19ef4 | 354 | generation, res->l_name); |
d680efe9 MF |
355 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type, ops, inode); |
356 | } | |
357 | ||
54a7e755 MF |
358 | static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres) |
359 | { | |
360 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
361 | ||
362 | return OCFS2_SB(inode->i_sb); | |
363 | } | |
364 | ||
d680efe9 MF |
365 | static __u64 ocfs2_get_dentry_lock_ino(struct ocfs2_lock_res *lockres) |
366 | { | |
367 | __be64 inode_blkno_be; | |
368 | ||
369 | memcpy(&inode_blkno_be, &lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], | |
370 | sizeof(__be64)); | |
371 | ||
372 | return be64_to_cpu(inode_blkno_be); | |
373 | } | |
374 | ||
54a7e755 MF |
375 | static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres) |
376 | { | |
377 | struct ocfs2_dentry_lock *dl = lockres->l_priv; | |
378 | ||
379 | return OCFS2_SB(dl->dl_inode->i_sb); | |
380 | } | |
381 | ||
d680efe9 MF |
382 | void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl, |
383 | u64 parent, struct inode *inode) | |
384 | { | |
385 | int len; | |
386 | u64 inode_blkno = OCFS2_I(inode)->ip_blkno; | |
387 | __be64 inode_blkno_be = cpu_to_be64(inode_blkno); | |
388 | struct ocfs2_lock_res *lockres = &dl->dl_lockres; | |
389 | ||
390 | ocfs2_lock_res_init_once(lockres); | |
391 | ||
392 | /* | |
393 | * Unfortunately, the standard lock naming scheme won't work | |
394 | * here because we have two 16 byte values to use. Instead, | |
395 | * we'll stuff the inode number as a binary value. We still | |
396 | * want error prints to show something without garbling the | |
397 | * display, so drop a null byte in there before the inode | |
398 | * number. A future version of OCFS2 will likely use all | |
399 | * binary lock names. The stringified names have been a | |
400 | * tremendous aid in debugging, but now that the debugfs | |
401 | * interface exists, we can mangle things there if need be. | |
402 | * | |
403 | * NOTE: We also drop the standard "pad" value (the total lock | |
404 | * name size stays the same though - the last part is all | |
405 | * zeros due to the memset in ocfs2_lock_res_init_once() | |
406 | */ | |
407 | len = snprintf(lockres->l_name, OCFS2_DENTRY_LOCK_INO_START, | |
408 | "%c%016llx", | |
409 | ocfs2_lock_type_char(OCFS2_LOCK_TYPE_DENTRY), | |
410 | (long long)parent); | |
411 | ||
412 | BUG_ON(len != (OCFS2_DENTRY_LOCK_INO_START - 1)); | |
413 | ||
414 | memcpy(&lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], &inode_blkno_be, | |
415 | sizeof(__be64)); | |
416 | ||
417 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres, | |
418 | OCFS2_LOCK_TYPE_DENTRY, &ocfs2_dentry_lops, | |
419 | dl); | |
ccd979bd MF |
420 | } |
421 | ||
422 | static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res, | |
423 | struct ocfs2_super *osb) | |
424 | { | |
425 | /* Superblock lockres doesn't come from a slab so we call init | |
426 | * once on it manually. */ | |
427 | ocfs2_lock_res_init_once(res); | |
d680efe9 MF |
428 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_SUPER, OCFS2_SUPER_BLOCK_BLKNO, |
429 | 0, res->l_name); | |
ccd979bd | 430 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER, |
ccd979bd MF |
431 | &ocfs2_super_lops, osb); |
432 | } | |
433 | ||
434 | static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res, | |
435 | struct ocfs2_super *osb) | |
436 | { | |
437 | /* Rename lockres doesn't come from a slab so we call init | |
438 | * once on it manually. */ | |
439 | ocfs2_lock_res_init_once(res); | |
d680efe9 MF |
440 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_RENAME, 0, 0, res->l_name); |
441 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME, | |
ccd979bd MF |
442 | &ocfs2_rename_lops, osb); |
443 | } | |
444 | ||
445 | void ocfs2_lock_res_free(struct ocfs2_lock_res *res) | |
446 | { | |
447 | mlog_entry_void(); | |
448 | ||
449 | if (!(res->l_flags & OCFS2_LOCK_INITIALIZED)) | |
450 | return; | |
451 | ||
452 | ocfs2_remove_lockres_tracking(res); | |
453 | ||
454 | mlog_bug_on_msg(!list_empty(&res->l_blocked_list), | |
455 | "Lockres %s is on the blocked list\n", | |
456 | res->l_name); | |
457 | mlog_bug_on_msg(!list_empty(&res->l_mask_waiters), | |
458 | "Lockres %s has mask waiters pending\n", | |
459 | res->l_name); | |
460 | mlog_bug_on_msg(spin_is_locked(&res->l_lock), | |
461 | "Lockres %s is locked\n", | |
462 | res->l_name); | |
463 | mlog_bug_on_msg(res->l_ro_holders, | |
464 | "Lockres %s has %u ro holders\n", | |
465 | res->l_name, res->l_ro_holders); | |
466 | mlog_bug_on_msg(res->l_ex_holders, | |
467 | "Lockres %s has %u ex holders\n", | |
468 | res->l_name, res->l_ex_holders); | |
469 | ||
470 | /* Need to clear out the lock status block for the dlm */ | |
471 | memset(&res->l_lksb, 0, sizeof(res->l_lksb)); | |
472 | ||
473 | res->l_flags = 0UL; | |
474 | mlog_exit_void(); | |
475 | } | |
476 | ||
477 | static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres, | |
478 | int level) | |
479 | { | |
480 | mlog_entry_void(); | |
481 | ||
482 | BUG_ON(!lockres); | |
483 | ||
484 | switch(level) { | |
485 | case LKM_EXMODE: | |
486 | lockres->l_ex_holders++; | |
487 | break; | |
488 | case LKM_PRMODE: | |
489 | lockres->l_ro_holders++; | |
490 | break; | |
491 | default: | |
492 | BUG(); | |
493 | } | |
494 | ||
495 | mlog_exit_void(); | |
496 | } | |
497 | ||
498 | static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres, | |
499 | int level) | |
500 | { | |
501 | mlog_entry_void(); | |
502 | ||
503 | BUG_ON(!lockres); | |
504 | ||
505 | switch(level) { | |
506 | case LKM_EXMODE: | |
507 | BUG_ON(!lockres->l_ex_holders); | |
508 | lockres->l_ex_holders--; | |
509 | break; | |
510 | case LKM_PRMODE: | |
511 | BUG_ON(!lockres->l_ro_holders); | |
512 | lockres->l_ro_holders--; | |
513 | break; | |
514 | default: | |
515 | BUG(); | |
516 | } | |
517 | mlog_exit_void(); | |
518 | } | |
519 | ||
520 | /* WARNING: This function lives in a world where the only three lock | |
521 | * levels are EX, PR, and NL. It *will* have to be adjusted when more | |
522 | * lock types are added. */ | |
523 | static inline int ocfs2_highest_compat_lock_level(int level) | |
524 | { | |
525 | int new_level = LKM_EXMODE; | |
526 | ||
527 | if (level == LKM_EXMODE) | |
528 | new_level = LKM_NLMODE; | |
529 | else if (level == LKM_PRMODE) | |
530 | new_level = LKM_PRMODE; | |
531 | return new_level; | |
532 | } | |
533 | ||
534 | static void lockres_set_flags(struct ocfs2_lock_res *lockres, | |
535 | unsigned long newflags) | |
536 | { | |
537 | struct list_head *pos, *tmp; | |
538 | struct ocfs2_mask_waiter *mw; | |
539 | ||
540 | assert_spin_locked(&lockres->l_lock); | |
541 | ||
542 | lockres->l_flags = newflags; | |
543 | ||
544 | list_for_each_safe(pos, tmp, &lockres->l_mask_waiters) { | |
545 | mw = list_entry(pos, struct ocfs2_mask_waiter, mw_item); | |
546 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) | |
547 | continue; | |
548 | ||
549 | list_del_init(&mw->mw_item); | |
550 | mw->mw_status = 0; | |
551 | complete(&mw->mw_complete); | |
552 | } | |
553 | } | |
554 | static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or) | |
555 | { | |
556 | lockres_set_flags(lockres, lockres->l_flags | or); | |
557 | } | |
558 | static void lockres_clear_flags(struct ocfs2_lock_res *lockres, | |
559 | unsigned long clear) | |
560 | { | |
561 | lockres_set_flags(lockres, lockres->l_flags & ~clear); | |
562 | } | |
563 | ||
564 | static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres) | |
565 | { | |
566 | mlog_entry_void(); | |
567 | ||
568 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); | |
569 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); | |
570 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
571 | BUG_ON(lockres->l_blocking <= LKM_NLMODE); | |
572 | ||
573 | lockres->l_level = lockres->l_requested; | |
574 | if (lockres->l_level <= | |
575 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) { | |
576 | lockres->l_blocking = LKM_NLMODE; | |
577 | lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED); | |
578 | } | |
579 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
580 | ||
581 | mlog_exit_void(); | |
582 | } | |
583 | ||
584 | static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres) | |
585 | { | |
586 | mlog_entry_void(); | |
587 | ||
588 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); | |
589 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); | |
590 | ||
591 | /* Convert from RO to EX doesn't really need anything as our | |
592 | * information is already up to data. Convert from NL to | |
593 | * *anything* however should mark ourselves as needing an | |
594 | * update */ | |
f625c979 MF |
595 | if (lockres->l_level == LKM_NLMODE && |
596 | lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) | |
ccd979bd MF |
597 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
598 | ||
599 | lockres->l_level = lockres->l_requested; | |
600 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
601 | ||
602 | mlog_exit_void(); | |
603 | } | |
604 | ||
605 | static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres) | |
606 | { | |
607 | mlog_entry_void(); | |
608 | ||
609 | BUG_ON((!lockres->l_flags & OCFS2_LOCK_BUSY)); | |
610 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); | |
611 | ||
612 | if (lockres->l_requested > LKM_NLMODE && | |
f625c979 MF |
613 | !(lockres->l_flags & OCFS2_LOCK_LOCAL) && |
614 | lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) | |
ccd979bd MF |
615 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
616 | ||
617 | lockres->l_level = lockres->l_requested; | |
618 | lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED); | |
619 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
620 | ||
621 | mlog_exit_void(); | |
622 | } | |
623 | ||
ccd979bd MF |
624 | static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, |
625 | int level) | |
626 | { | |
627 | int needs_downconvert = 0; | |
628 | mlog_entry_void(); | |
629 | ||
630 | assert_spin_locked(&lockres->l_lock); | |
631 | ||
632 | lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); | |
633 | ||
634 | if (level > lockres->l_blocking) { | |
635 | /* only schedule a downconvert if we haven't already scheduled | |
636 | * one that goes low enough to satisfy the level we're | |
637 | * blocking. this also catches the case where we get | |
638 | * duplicate BASTs */ | |
639 | if (ocfs2_highest_compat_lock_level(level) < | |
640 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) | |
641 | needs_downconvert = 1; | |
642 | ||
643 | lockres->l_blocking = level; | |
644 | } | |
645 | ||
646 | mlog_exit(needs_downconvert); | |
647 | return needs_downconvert; | |
648 | } | |
649 | ||
aa2623ad | 650 | static void ocfs2_blocking_ast(void *opaque, int level) |
ccd979bd | 651 | { |
aa2623ad MF |
652 | struct ocfs2_lock_res *lockres = opaque; |
653 | struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); | |
ccd979bd MF |
654 | int needs_downconvert; |
655 | unsigned long flags; | |
656 | ||
ccd979bd MF |
657 | BUG_ON(level <= LKM_NLMODE); |
658 | ||
aa2623ad MF |
659 | mlog(0, "BAST fired for lockres %s, blocking %d, level %d type %s\n", |
660 | lockres->l_name, level, lockres->l_level, | |
661 | ocfs2_lock_type_string(lockres->l_type)); | |
662 | ||
ccd979bd MF |
663 | spin_lock_irqsave(&lockres->l_lock, flags); |
664 | needs_downconvert = ocfs2_generic_handle_bast(lockres, level); | |
665 | if (needs_downconvert) | |
666 | ocfs2_schedule_blocked_lock(osb, lockres); | |
667 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
668 | ||
d680efe9 MF |
669 | wake_up(&lockres->l_event); |
670 | ||
ccd979bd | 671 | ocfs2_kick_vote_thread(osb); |
ccd979bd MF |
672 | } |
673 | ||
e92d57df | 674 | static void ocfs2_locking_ast(void *opaque) |
ccd979bd | 675 | { |
e92d57df | 676 | struct ocfs2_lock_res *lockres = opaque; |
ccd979bd MF |
677 | struct dlm_lockstatus *lksb = &lockres->l_lksb; |
678 | unsigned long flags; | |
679 | ||
680 | spin_lock_irqsave(&lockres->l_lock, flags); | |
681 | ||
682 | if (lksb->status != DLM_NORMAL) { | |
683 | mlog(ML_ERROR, "lockres %s: lksb status value of %u!\n", | |
684 | lockres->l_name, lksb->status); | |
685 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
686 | return; | |
687 | } | |
688 | ||
689 | switch(lockres->l_action) { | |
690 | case OCFS2_AST_ATTACH: | |
691 | ocfs2_generic_handle_attach_action(lockres); | |
e92d57df | 692 | lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL); |
ccd979bd MF |
693 | break; |
694 | case OCFS2_AST_CONVERT: | |
695 | ocfs2_generic_handle_convert_action(lockres); | |
696 | break; | |
697 | case OCFS2_AST_DOWNCONVERT: | |
698 | ocfs2_generic_handle_downconvert_action(lockres); | |
699 | break; | |
700 | default: | |
e92d57df MF |
701 | mlog(ML_ERROR, "lockres %s: ast fired with invalid action: %u " |
702 | "lockres flags = 0x%lx, unlock action: %u\n", | |
703 | lockres->l_name, lockres->l_action, lockres->l_flags, | |
704 | lockres->l_unlock_action); | |
ccd979bd MF |
705 | BUG(); |
706 | } | |
707 | ||
ccd979bd MF |
708 | /* set it to something invalid so if we get called again we |
709 | * can catch it. */ | |
710 | lockres->l_action = OCFS2_AST_INVALID; | |
ccd979bd MF |
711 | |
712 | wake_up(&lockres->l_event); | |
d680efe9 | 713 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
ccd979bd MF |
714 | } |
715 | ||
ccd979bd MF |
716 | static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, |
717 | int convert) | |
718 | { | |
719 | unsigned long flags; | |
720 | ||
721 | mlog_entry_void(); | |
722 | spin_lock_irqsave(&lockres->l_lock, flags); | |
723 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
724 | if (convert) | |
725 | lockres->l_action = OCFS2_AST_INVALID; | |
726 | else | |
727 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
728 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
729 | ||
730 | wake_up(&lockres->l_event); | |
731 | mlog_exit_void(); | |
732 | } | |
733 | ||
734 | /* Note: If we detect another process working on the lock (i.e., | |
735 | * OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller | |
736 | * to do the right thing in that case. | |
737 | */ | |
738 | static int ocfs2_lock_create(struct ocfs2_super *osb, | |
739 | struct ocfs2_lock_res *lockres, | |
740 | int level, | |
741 | int dlm_flags) | |
742 | { | |
743 | int ret = 0; | |
744 | enum dlm_status status; | |
745 | unsigned long flags; | |
746 | ||
747 | mlog_entry_void(); | |
748 | ||
749 | mlog(0, "lock %s, level = %d, flags = %d\n", lockres->l_name, level, | |
750 | dlm_flags); | |
751 | ||
752 | spin_lock_irqsave(&lockres->l_lock, flags); | |
753 | if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) || | |
754 | (lockres->l_flags & OCFS2_LOCK_BUSY)) { | |
755 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
756 | goto bail; | |
757 | } | |
758 | ||
759 | lockres->l_action = OCFS2_AST_ATTACH; | |
760 | lockres->l_requested = level; | |
761 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
762 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
763 | ||
764 | status = dlmlock(osb->dlm, | |
765 | level, | |
766 | &lockres->l_lksb, | |
767 | dlm_flags, | |
768 | lockres->l_name, | |
f0681062 | 769 | OCFS2_LOCK_ID_MAX_LEN - 1, |
e92d57df | 770 | ocfs2_locking_ast, |
ccd979bd | 771 | lockres, |
aa2623ad | 772 | ocfs2_blocking_ast); |
ccd979bd MF |
773 | if (status != DLM_NORMAL) { |
774 | ocfs2_log_dlm_error("dlmlock", status, lockres); | |
775 | ret = -EINVAL; | |
776 | ocfs2_recover_from_dlm_error(lockres, 1); | |
777 | } | |
778 | ||
779 | mlog(0, "lock %s, successfull return from dlmlock\n", lockres->l_name); | |
780 | ||
781 | bail: | |
782 | mlog_exit(ret); | |
783 | return ret; | |
784 | } | |
785 | ||
786 | static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres, | |
787 | int flag) | |
788 | { | |
789 | unsigned long flags; | |
790 | int ret; | |
791 | ||
792 | spin_lock_irqsave(&lockres->l_lock, flags); | |
793 | ret = lockres->l_flags & flag; | |
794 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
795 | ||
796 | return ret; | |
797 | } | |
798 | ||
799 | static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres) | |
800 | ||
801 | { | |
802 | wait_event(lockres->l_event, | |
803 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY)); | |
804 | } | |
805 | ||
806 | static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres) | |
807 | ||
808 | { | |
809 | wait_event(lockres->l_event, | |
810 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING)); | |
811 | } | |
812 | ||
813 | /* predict what lock level we'll be dropping down to on behalf | |
814 | * of another node, and return true if the currently wanted | |
815 | * level will be compatible with it. */ | |
816 | static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, | |
817 | int wanted) | |
818 | { | |
819 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
820 | ||
821 | return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking); | |
822 | } | |
823 | ||
824 | static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw) | |
825 | { | |
826 | INIT_LIST_HEAD(&mw->mw_item); | |
827 | init_completion(&mw->mw_complete); | |
828 | } | |
829 | ||
830 | static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw) | |
831 | { | |
832 | wait_for_completion(&mw->mw_complete); | |
833 | /* Re-arm the completion in case we want to wait on it again */ | |
834 | INIT_COMPLETION(mw->mw_complete); | |
835 | return mw->mw_status; | |
836 | } | |
837 | ||
838 | static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres, | |
839 | struct ocfs2_mask_waiter *mw, | |
840 | unsigned long mask, | |
841 | unsigned long goal) | |
842 | { | |
843 | BUG_ON(!list_empty(&mw->mw_item)); | |
844 | ||
845 | assert_spin_locked(&lockres->l_lock); | |
846 | ||
847 | list_add_tail(&mw->mw_item, &lockres->l_mask_waiters); | |
848 | mw->mw_mask = mask; | |
849 | mw->mw_goal = goal; | |
850 | } | |
851 | ||
852 | /* returns 0 if the mw that was removed was already satisfied, -EBUSY | |
853 | * if the mask still hadn't reached its goal */ | |
854 | static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres, | |
855 | struct ocfs2_mask_waiter *mw) | |
856 | { | |
857 | unsigned long flags; | |
858 | int ret = 0; | |
859 | ||
860 | spin_lock_irqsave(&lockres->l_lock, flags); | |
861 | if (!list_empty(&mw->mw_item)) { | |
862 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) | |
863 | ret = -EBUSY; | |
864 | ||
865 | list_del_init(&mw->mw_item); | |
866 | init_completion(&mw->mw_complete); | |
867 | } | |
868 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
869 | ||
870 | return ret; | |
871 | ||
872 | } | |
873 | ||
874 | static int ocfs2_cluster_lock(struct ocfs2_super *osb, | |
875 | struct ocfs2_lock_res *lockres, | |
876 | int level, | |
877 | int lkm_flags, | |
878 | int arg_flags) | |
879 | { | |
880 | struct ocfs2_mask_waiter mw; | |
881 | enum dlm_status status; | |
882 | int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR); | |
883 | int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */ | |
884 | unsigned long flags; | |
885 | ||
886 | mlog_entry_void(); | |
887 | ||
888 | ocfs2_init_mask_waiter(&mw); | |
889 | ||
b80fc012 MF |
890 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
891 | lkm_flags |= LKM_VALBLK; | |
892 | ||
ccd979bd MF |
893 | again: |
894 | wait = 0; | |
895 | ||
896 | if (catch_signals && signal_pending(current)) { | |
897 | ret = -ERESTARTSYS; | |
898 | goto out; | |
899 | } | |
900 | ||
901 | spin_lock_irqsave(&lockres->l_lock, flags); | |
902 | ||
903 | mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING, | |
904 | "Cluster lock called on freeing lockres %s! flags " | |
905 | "0x%lx\n", lockres->l_name, lockres->l_flags); | |
906 | ||
907 | /* We only compare against the currently granted level | |
908 | * here. If the lock is blocked waiting on a downconvert, | |
909 | * we'll get caught below. */ | |
910 | if (lockres->l_flags & OCFS2_LOCK_BUSY && | |
911 | level > lockres->l_level) { | |
912 | /* is someone sitting in dlm_lock? If so, wait on | |
913 | * them. */ | |
914 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
915 | wait = 1; | |
916 | goto unlock; | |
917 | } | |
918 | ||
919 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { | |
920 | /* lock has not been created yet. */ | |
921 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
922 | ||
923 | ret = ocfs2_lock_create(osb, lockres, LKM_NLMODE, 0); | |
924 | if (ret < 0) { | |
925 | mlog_errno(ret); | |
926 | goto out; | |
927 | } | |
928 | goto again; | |
929 | } | |
930 | ||
931 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED && | |
932 | !ocfs2_may_continue_on_blocked_lock(lockres, level)) { | |
933 | /* is the lock is currently blocked on behalf of | |
934 | * another node */ | |
935 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0); | |
936 | wait = 1; | |
937 | goto unlock; | |
938 | } | |
939 | ||
940 | if (level > lockres->l_level) { | |
941 | if (lockres->l_action != OCFS2_AST_INVALID) | |
942 | mlog(ML_ERROR, "lockres %s has action %u pending\n", | |
943 | lockres->l_name, lockres->l_action); | |
944 | ||
945 | lockres->l_action = OCFS2_AST_CONVERT; | |
946 | lockres->l_requested = level; | |
947 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
948 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
949 | ||
950 | BUG_ON(level == LKM_IVMODE); | |
951 | BUG_ON(level == LKM_NLMODE); | |
952 | ||
953 | mlog(0, "lock %s, convert from %d to level = %d\n", | |
954 | lockres->l_name, lockres->l_level, level); | |
955 | ||
956 | /* call dlm_lock to upgrade lock now */ | |
957 | status = dlmlock(osb->dlm, | |
958 | level, | |
959 | &lockres->l_lksb, | |
b80fc012 | 960 | lkm_flags|LKM_CONVERT, |
ccd979bd | 961 | lockres->l_name, |
f0681062 | 962 | OCFS2_LOCK_ID_MAX_LEN - 1, |
e92d57df | 963 | ocfs2_locking_ast, |
ccd979bd | 964 | lockres, |
aa2623ad | 965 | ocfs2_blocking_ast); |
ccd979bd MF |
966 | if (status != DLM_NORMAL) { |
967 | if ((lkm_flags & LKM_NOQUEUE) && | |
968 | (status == DLM_NOTQUEUED)) | |
969 | ret = -EAGAIN; | |
970 | else { | |
971 | ocfs2_log_dlm_error("dlmlock", status, | |
972 | lockres); | |
973 | ret = -EINVAL; | |
974 | } | |
975 | ocfs2_recover_from_dlm_error(lockres, 1); | |
976 | goto out; | |
977 | } | |
978 | ||
979 | mlog(0, "lock %s, successfull return from dlmlock\n", | |
980 | lockres->l_name); | |
981 | ||
982 | /* At this point we've gone inside the dlm and need to | |
983 | * complete our work regardless. */ | |
984 | catch_signals = 0; | |
985 | ||
986 | /* wait for busy to clear and carry on */ | |
987 | goto again; | |
988 | } | |
989 | ||
990 | /* Ok, if we get here then we're good to go. */ | |
991 | ocfs2_inc_holders(lockres, level); | |
992 | ||
993 | ret = 0; | |
994 | unlock: | |
995 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
996 | out: | |
997 | /* | |
998 | * This is helping work around a lock inversion between the page lock | |
999 | * and dlm locks. One path holds the page lock while calling aops | |
1000 | * which block acquiring dlm locks. The voting thread holds dlm | |
1001 | * locks while acquiring page locks while down converting data locks. | |
1002 | * This block is helping an aop path notice the inversion and back | |
1003 | * off to unlock its page lock before trying the dlm lock again. | |
1004 | */ | |
1005 | if (wait && arg_flags & OCFS2_LOCK_NONBLOCK && | |
1006 | mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) { | |
1007 | wait = 0; | |
1008 | if (lockres_remove_mask_waiter(lockres, &mw)) | |
1009 | ret = -EAGAIN; | |
1010 | else | |
1011 | goto again; | |
1012 | } | |
1013 | if (wait) { | |
1014 | ret = ocfs2_wait_for_mask(&mw); | |
1015 | if (ret == 0) | |
1016 | goto again; | |
1017 | mlog_errno(ret); | |
1018 | } | |
1019 | ||
1020 | mlog_exit(ret); | |
1021 | return ret; | |
1022 | } | |
1023 | ||
1024 | static void ocfs2_cluster_unlock(struct ocfs2_super *osb, | |
1025 | struct ocfs2_lock_res *lockres, | |
1026 | int level) | |
1027 | { | |
1028 | unsigned long flags; | |
1029 | ||
1030 | mlog_entry_void(); | |
1031 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1032 | ocfs2_dec_holders(lockres, level); | |
1033 | ocfs2_vote_on_unlock(osb, lockres); | |
1034 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1035 | mlog_exit_void(); | |
1036 | } | |
1037 | ||
d680efe9 MF |
1038 | int ocfs2_create_new_lock(struct ocfs2_super *osb, |
1039 | struct ocfs2_lock_res *lockres, | |
24c19ef4 MF |
1040 | int ex, |
1041 | int local) | |
ccd979bd | 1042 | { |
d680efe9 | 1043 | int level = ex ? LKM_EXMODE : LKM_PRMODE; |
ccd979bd | 1044 | unsigned long flags; |
24c19ef4 | 1045 | int lkm_flags = local ? LKM_LOCAL : 0; |
ccd979bd MF |
1046 | |
1047 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1048 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); | |
1049 | lockres_or_flags(lockres, OCFS2_LOCK_LOCAL); | |
1050 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1051 | ||
24c19ef4 | 1052 | return ocfs2_lock_create(osb, lockres, level, lkm_flags); |
ccd979bd MF |
1053 | } |
1054 | ||
1055 | /* Grants us an EX lock on the data and metadata resources, skipping | |
1056 | * the normal cluster directory lookup. Use this ONLY on newly created | |
1057 | * inodes which other nodes can't possibly see, and which haven't been | |
1058 | * hashed in the inode hash yet. This can give us a good performance | |
1059 | * increase as it'll skip the network broadcast normally associated | |
1060 | * with creating a new lock resource. */ | |
1061 | int ocfs2_create_new_inode_locks(struct inode *inode) | |
1062 | { | |
1063 | int ret; | |
d680efe9 | 1064 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
1065 | |
1066 | BUG_ON(!inode); | |
1067 | BUG_ON(!ocfs2_inode_is_new(inode)); | |
1068 | ||
1069 | mlog_entry_void(); | |
1070 | ||
b0697053 | 1071 | mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno); |
ccd979bd MF |
1072 | |
1073 | /* NOTE: That we don't increment any of the holder counts, nor | |
1074 | * do we add anything to a journal handle. Since this is | |
1075 | * supposed to be a new inode which the cluster doesn't know | |
1076 | * about yet, there is no need to. As far as the LVB handling | |
1077 | * is concerned, this is basically like acquiring an EX lock | |
1078 | * on a resource which has an invalid one -- we'll set it | |
1079 | * valid when we release the EX. */ | |
1080 | ||
24c19ef4 | 1081 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_rw_lockres, 1, 1); |
ccd979bd MF |
1082 | if (ret) { |
1083 | mlog_errno(ret); | |
1084 | goto bail; | |
1085 | } | |
1086 | ||
24c19ef4 MF |
1087 | /* |
1088 | * We don't want to use LKM_LOCAL on a meta data lock as they | |
1089 | * don't use a generation in their lock names. | |
1090 | */ | |
1091 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_meta_lockres, 1, 0); | |
ccd979bd MF |
1092 | if (ret) { |
1093 | mlog_errno(ret); | |
1094 | goto bail; | |
1095 | } | |
1096 | ||
24c19ef4 | 1097 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_data_lockres, 1, 1); |
ccd979bd MF |
1098 | if (ret) { |
1099 | mlog_errno(ret); | |
1100 | goto bail; | |
1101 | } | |
1102 | ||
1103 | bail: | |
1104 | mlog_exit(ret); | |
1105 | return ret; | |
1106 | } | |
1107 | ||
1108 | int ocfs2_rw_lock(struct inode *inode, int write) | |
1109 | { | |
1110 | int status, level; | |
1111 | struct ocfs2_lock_res *lockres; | |
1112 | ||
1113 | BUG_ON(!inode); | |
1114 | ||
1115 | mlog_entry_void(); | |
1116 | ||
b0697053 MF |
1117 | mlog(0, "inode %llu take %s RW lock\n", |
1118 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1119 | write ? "EXMODE" : "PRMODE"); |
1120 | ||
1121 | lockres = &OCFS2_I(inode)->ip_rw_lockres; | |
1122 | ||
1123 | level = write ? LKM_EXMODE : LKM_PRMODE; | |
1124 | ||
1125 | status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, 0, | |
1126 | 0); | |
1127 | if (status < 0) | |
1128 | mlog_errno(status); | |
1129 | ||
1130 | mlog_exit(status); | |
1131 | return status; | |
1132 | } | |
1133 | ||
1134 | void ocfs2_rw_unlock(struct inode *inode, int write) | |
1135 | { | |
1136 | int level = write ? LKM_EXMODE : LKM_PRMODE; | |
1137 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres; | |
1138 | ||
1139 | mlog_entry_void(); | |
1140 | ||
b0697053 MF |
1141 | mlog(0, "inode %llu drop %s RW lock\n", |
1142 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1143 | write ? "EXMODE" : "PRMODE"); |
1144 | ||
1145 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); | |
1146 | ||
1147 | mlog_exit_void(); | |
1148 | } | |
1149 | ||
1150 | int ocfs2_data_lock_full(struct inode *inode, | |
1151 | int write, | |
1152 | int arg_flags) | |
1153 | { | |
1154 | int status = 0, level; | |
1155 | struct ocfs2_lock_res *lockres; | |
1156 | ||
1157 | BUG_ON(!inode); | |
1158 | ||
1159 | mlog_entry_void(); | |
1160 | ||
b0697053 MF |
1161 | mlog(0, "inode %llu take %s DATA lock\n", |
1162 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1163 | write ? "EXMODE" : "PRMODE"); |
1164 | ||
1165 | /* We'll allow faking a readonly data lock for | |
1166 | * rodevices. */ | |
1167 | if (ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) { | |
1168 | if (write) { | |
1169 | status = -EROFS; | |
1170 | mlog_errno(status); | |
1171 | } | |
1172 | goto out; | |
1173 | } | |
1174 | ||
1175 | lockres = &OCFS2_I(inode)->ip_data_lockres; | |
1176 | ||
1177 | level = write ? LKM_EXMODE : LKM_PRMODE; | |
1178 | ||
1179 | status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, | |
1180 | 0, arg_flags); | |
1181 | if (status < 0 && status != -EAGAIN) | |
1182 | mlog_errno(status); | |
1183 | ||
1184 | out: | |
1185 | mlog_exit(status); | |
1186 | return status; | |
1187 | } | |
1188 | ||
1189 | /* see ocfs2_meta_lock_with_page() */ | |
1190 | int ocfs2_data_lock_with_page(struct inode *inode, | |
1191 | int write, | |
1192 | struct page *page) | |
1193 | { | |
1194 | int ret; | |
1195 | ||
1196 | ret = ocfs2_data_lock_full(inode, write, OCFS2_LOCK_NONBLOCK); | |
1197 | if (ret == -EAGAIN) { | |
1198 | unlock_page(page); | |
1199 | if (ocfs2_data_lock(inode, write) == 0) | |
1200 | ocfs2_data_unlock(inode, write); | |
1201 | ret = AOP_TRUNCATED_PAGE; | |
1202 | } | |
1203 | ||
1204 | return ret; | |
1205 | } | |
1206 | ||
1207 | static void ocfs2_vote_on_unlock(struct ocfs2_super *osb, | |
1208 | struct ocfs2_lock_res *lockres) | |
1209 | { | |
1210 | int kick = 0; | |
1211 | ||
1212 | mlog_entry_void(); | |
1213 | ||
1214 | /* If we know that another node is waiting on our lock, kick | |
1215 | * the vote thread * pre-emptively when we reach a release | |
1216 | * condition. */ | |
1217 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) { | |
1218 | switch(lockres->l_blocking) { | |
1219 | case LKM_EXMODE: | |
1220 | if (!lockres->l_ex_holders && !lockres->l_ro_holders) | |
1221 | kick = 1; | |
1222 | break; | |
1223 | case LKM_PRMODE: | |
1224 | if (!lockres->l_ex_holders) | |
1225 | kick = 1; | |
1226 | break; | |
1227 | default: | |
1228 | BUG(); | |
1229 | } | |
1230 | } | |
1231 | ||
1232 | if (kick) | |
1233 | ocfs2_kick_vote_thread(osb); | |
1234 | ||
1235 | mlog_exit_void(); | |
1236 | } | |
1237 | ||
1238 | void ocfs2_data_unlock(struct inode *inode, | |
1239 | int write) | |
1240 | { | |
1241 | int level = write ? LKM_EXMODE : LKM_PRMODE; | |
1242 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_data_lockres; | |
1243 | ||
1244 | mlog_entry_void(); | |
1245 | ||
b0697053 MF |
1246 | mlog(0, "inode %llu drop %s DATA lock\n", |
1247 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1248 | write ? "EXMODE" : "PRMODE"); |
1249 | ||
1250 | if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) | |
1251 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); | |
1252 | ||
1253 | mlog_exit_void(); | |
1254 | } | |
1255 | ||
1256 | #define OCFS2_SEC_BITS 34 | |
1257 | #define OCFS2_SEC_SHIFT (64 - 34) | |
1258 | #define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1) | |
1259 | ||
1260 | /* LVB only has room for 64 bits of time here so we pack it for | |
1261 | * now. */ | |
1262 | static u64 ocfs2_pack_timespec(struct timespec *spec) | |
1263 | { | |
1264 | u64 res; | |
1265 | u64 sec = spec->tv_sec; | |
1266 | u32 nsec = spec->tv_nsec; | |
1267 | ||
1268 | res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK); | |
1269 | ||
1270 | return res; | |
1271 | } | |
1272 | ||
1273 | /* Call this with the lockres locked. I am reasonably sure we don't | |
1274 | * need ip_lock in this function as anyone who would be changing those | |
1275 | * values is supposed to be blocked in ocfs2_meta_lock right now. */ | |
1276 | static void __ocfs2_stuff_meta_lvb(struct inode *inode) | |
1277 | { | |
1278 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
1279 | struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres; | |
1280 | struct ocfs2_meta_lvb *lvb; | |
1281 | ||
1282 | mlog_entry_void(); | |
1283 | ||
1284 | lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; | |
1285 | ||
24c19ef4 MF |
1286 | /* |
1287 | * Invalidate the LVB of a deleted inode - this way other | |
1288 | * nodes are forced to go to disk and discover the new inode | |
1289 | * status. | |
1290 | */ | |
1291 | if (oi->ip_flags & OCFS2_INODE_DELETED) { | |
1292 | lvb->lvb_version = 0; | |
1293 | goto out; | |
1294 | } | |
1295 | ||
4d3b83f7 | 1296 | lvb->lvb_version = OCFS2_LVB_VERSION; |
ccd979bd MF |
1297 | lvb->lvb_isize = cpu_to_be64(i_size_read(inode)); |
1298 | lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters); | |
1299 | lvb->lvb_iuid = cpu_to_be32(inode->i_uid); | |
1300 | lvb->lvb_igid = cpu_to_be32(inode->i_gid); | |
1301 | lvb->lvb_imode = cpu_to_be16(inode->i_mode); | |
1302 | lvb->lvb_inlink = cpu_to_be16(inode->i_nlink); | |
1303 | lvb->lvb_iatime_packed = | |
1304 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime)); | |
1305 | lvb->lvb_ictime_packed = | |
1306 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime)); | |
1307 | lvb->lvb_imtime_packed = | |
1308 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime)); | |
ca4d147e | 1309 | lvb->lvb_iattr = cpu_to_be32(oi->ip_attr); |
f9e2d82e | 1310 | lvb->lvb_igeneration = cpu_to_be32(inode->i_generation); |
ccd979bd | 1311 | |
24c19ef4 | 1312 | out: |
ccd979bd MF |
1313 | mlog_meta_lvb(0, lockres); |
1314 | ||
1315 | mlog_exit_void(); | |
1316 | } | |
1317 | ||
1318 | static void ocfs2_unpack_timespec(struct timespec *spec, | |
1319 | u64 packed_time) | |
1320 | { | |
1321 | spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT; | |
1322 | spec->tv_nsec = packed_time & OCFS2_NSEC_MASK; | |
1323 | } | |
1324 | ||
1325 | static void ocfs2_refresh_inode_from_lvb(struct inode *inode) | |
1326 | { | |
1327 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
1328 | struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres; | |
1329 | struct ocfs2_meta_lvb *lvb; | |
1330 | ||
1331 | mlog_entry_void(); | |
1332 | ||
1333 | mlog_meta_lvb(0, lockres); | |
1334 | ||
1335 | lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; | |
1336 | ||
1337 | /* We're safe here without the lockres lock... */ | |
1338 | spin_lock(&oi->ip_lock); | |
1339 | oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters); | |
1340 | i_size_write(inode, be64_to_cpu(lvb->lvb_isize)); | |
1341 | ||
ca4d147e HP |
1342 | oi->ip_attr = be32_to_cpu(lvb->lvb_iattr); |
1343 | ocfs2_set_inode_flags(inode); | |
1344 | ||
ccd979bd MF |
1345 | /* fast-symlinks are a special case */ |
1346 | if (S_ISLNK(inode->i_mode) && !oi->ip_clusters) | |
1347 | inode->i_blocks = 0; | |
1348 | else | |
1349 | inode->i_blocks = | |
1350 | ocfs2_align_bytes_to_sectors(i_size_read(inode)); | |
1351 | ||
1352 | inode->i_uid = be32_to_cpu(lvb->lvb_iuid); | |
1353 | inode->i_gid = be32_to_cpu(lvb->lvb_igid); | |
1354 | inode->i_mode = be16_to_cpu(lvb->lvb_imode); | |
1355 | inode->i_nlink = be16_to_cpu(lvb->lvb_inlink); | |
1356 | ocfs2_unpack_timespec(&inode->i_atime, | |
1357 | be64_to_cpu(lvb->lvb_iatime_packed)); | |
1358 | ocfs2_unpack_timespec(&inode->i_mtime, | |
1359 | be64_to_cpu(lvb->lvb_imtime_packed)); | |
1360 | ocfs2_unpack_timespec(&inode->i_ctime, | |
1361 | be64_to_cpu(lvb->lvb_ictime_packed)); | |
1362 | spin_unlock(&oi->ip_lock); | |
1363 | ||
1364 | mlog_exit_void(); | |
1365 | } | |
1366 | ||
f9e2d82e MF |
1367 | static inline int ocfs2_meta_lvb_is_trustable(struct inode *inode, |
1368 | struct ocfs2_lock_res *lockres) | |
ccd979bd MF |
1369 | { |
1370 | struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; | |
1371 | ||
f9e2d82e MF |
1372 | if (lvb->lvb_version == OCFS2_LVB_VERSION |
1373 | && be32_to_cpu(lvb->lvb_igeneration) == inode->i_generation) | |
ccd979bd MF |
1374 | return 1; |
1375 | return 0; | |
1376 | } | |
1377 | ||
1378 | /* Determine whether a lock resource needs to be refreshed, and | |
1379 | * arbitrate who gets to refresh it. | |
1380 | * | |
1381 | * 0 means no refresh needed. | |
1382 | * | |
1383 | * > 0 means you need to refresh this and you MUST call | |
1384 | * ocfs2_complete_lock_res_refresh afterwards. */ | |
1385 | static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres) | |
1386 | { | |
1387 | unsigned long flags; | |
1388 | int status = 0; | |
1389 | ||
1390 | mlog_entry_void(); | |
1391 | ||
1392 | refresh_check: | |
1393 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1394 | if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) { | |
1395 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1396 | goto bail; | |
1397 | } | |
1398 | ||
1399 | if (lockres->l_flags & OCFS2_LOCK_REFRESHING) { | |
1400 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1401 | ||
1402 | ocfs2_wait_on_refreshing_lock(lockres); | |
1403 | goto refresh_check; | |
1404 | } | |
1405 | ||
1406 | /* Ok, I'll be the one to refresh this lock. */ | |
1407 | lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING); | |
1408 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1409 | ||
1410 | status = 1; | |
1411 | bail: | |
1412 | mlog_exit(status); | |
1413 | return status; | |
1414 | } | |
1415 | ||
1416 | /* If status is non zero, I'll mark it as not being in refresh | |
1417 | * anymroe, but i won't clear the needs refresh flag. */ | |
1418 | static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres, | |
1419 | int status) | |
1420 | { | |
1421 | unsigned long flags; | |
1422 | mlog_entry_void(); | |
1423 | ||
1424 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1425 | lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING); | |
1426 | if (!status) | |
1427 | lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); | |
1428 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1429 | ||
1430 | wake_up(&lockres->l_event); | |
1431 | ||
1432 | mlog_exit_void(); | |
1433 | } | |
1434 | ||
1435 | /* may or may not return a bh if it went to disk. */ | |
1436 | static int ocfs2_meta_lock_update(struct inode *inode, | |
1437 | struct buffer_head **bh) | |
1438 | { | |
1439 | int status = 0; | |
1440 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
1441 | struct ocfs2_lock_res *lockres; | |
1442 | struct ocfs2_dinode *fe; | |
1443 | ||
1444 | mlog_entry_void(); | |
1445 | ||
1446 | spin_lock(&oi->ip_lock); | |
1447 | if (oi->ip_flags & OCFS2_INODE_DELETED) { | |
b0697053 | 1448 | mlog(0, "Orphaned inode %llu was deleted while we " |
ccd979bd | 1449 | "were waiting on a lock. ip_flags = 0x%x\n", |
b0697053 | 1450 | (unsigned long long)oi->ip_blkno, oi->ip_flags); |
ccd979bd MF |
1451 | spin_unlock(&oi->ip_lock); |
1452 | status = -ENOENT; | |
1453 | goto bail; | |
1454 | } | |
1455 | spin_unlock(&oi->ip_lock); | |
1456 | ||
1457 | lockres = &oi->ip_meta_lockres; | |
1458 | ||
1459 | if (!ocfs2_should_refresh_lock_res(lockres)) | |
1460 | goto bail; | |
1461 | ||
1462 | /* This will discard any caching information we might have had | |
1463 | * for the inode metadata. */ | |
1464 | ocfs2_metadata_cache_purge(inode); | |
1465 | ||
1466 | /* will do nothing for inode types that don't use the extent | |
1467 | * map (directories, bitmap files, etc) */ | |
1468 | ocfs2_extent_map_trunc(inode, 0); | |
1469 | ||
f9e2d82e | 1470 | if (ocfs2_meta_lvb_is_trustable(inode, lockres)) { |
b0697053 MF |
1471 | mlog(0, "Trusting LVB on inode %llu\n", |
1472 | (unsigned long long)oi->ip_blkno); | |
ccd979bd MF |
1473 | ocfs2_refresh_inode_from_lvb(inode); |
1474 | } else { | |
1475 | /* Boo, we have to go to disk. */ | |
1476 | /* read bh, cast, ocfs2_refresh_inode */ | |
1477 | status = ocfs2_read_block(OCFS2_SB(inode->i_sb), oi->ip_blkno, | |
1478 | bh, OCFS2_BH_CACHED, inode); | |
1479 | if (status < 0) { | |
1480 | mlog_errno(status); | |
1481 | goto bail_refresh; | |
1482 | } | |
1483 | fe = (struct ocfs2_dinode *) (*bh)->b_data; | |
1484 | ||
1485 | /* This is a good chance to make sure we're not | |
1486 | * locking an invalid object. | |
1487 | * | |
1488 | * We bug on a stale inode here because we checked | |
1489 | * above whether it was wiped from disk. The wiping | |
1490 | * node provides a guarantee that we receive that | |
1491 | * message and can mark the inode before dropping any | |
1492 | * locks associated with it. */ | |
1493 | if (!OCFS2_IS_VALID_DINODE(fe)) { | |
1494 | OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); | |
1495 | status = -EIO; | |
1496 | goto bail_refresh; | |
1497 | } | |
1498 | mlog_bug_on_msg(inode->i_generation != | |
1499 | le32_to_cpu(fe->i_generation), | |
b0697053 | 1500 | "Invalid dinode %llu disk generation: %u " |
ccd979bd | 1501 | "inode->i_generation: %u\n", |
b0697053 MF |
1502 | (unsigned long long)oi->ip_blkno, |
1503 | le32_to_cpu(fe->i_generation), | |
ccd979bd MF |
1504 | inode->i_generation); |
1505 | mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) || | |
1506 | !(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)), | |
b0697053 MF |
1507 | "Stale dinode %llu dtime: %llu flags: 0x%x\n", |
1508 | (unsigned long long)oi->ip_blkno, | |
1509 | (unsigned long long)le64_to_cpu(fe->i_dtime), | |
ccd979bd MF |
1510 | le32_to_cpu(fe->i_flags)); |
1511 | ||
1512 | ocfs2_refresh_inode(inode, fe); | |
1513 | } | |
1514 | ||
1515 | status = 0; | |
1516 | bail_refresh: | |
1517 | ocfs2_complete_lock_res_refresh(lockres, status); | |
1518 | bail: | |
1519 | mlog_exit(status); | |
1520 | return status; | |
1521 | } | |
1522 | ||
1523 | static int ocfs2_assign_bh(struct inode *inode, | |
1524 | struct buffer_head **ret_bh, | |
1525 | struct buffer_head *passed_bh) | |
1526 | { | |
1527 | int status; | |
1528 | ||
1529 | if (passed_bh) { | |
1530 | /* Ok, the update went to disk for us, use the | |
1531 | * returned bh. */ | |
1532 | *ret_bh = passed_bh; | |
1533 | get_bh(*ret_bh); | |
1534 | ||
1535 | return 0; | |
1536 | } | |
1537 | ||
1538 | status = ocfs2_read_block(OCFS2_SB(inode->i_sb), | |
1539 | OCFS2_I(inode)->ip_blkno, | |
1540 | ret_bh, | |
1541 | OCFS2_BH_CACHED, | |
1542 | inode); | |
1543 | if (status < 0) | |
1544 | mlog_errno(status); | |
1545 | ||
1546 | return status; | |
1547 | } | |
1548 | ||
1549 | /* | |
1550 | * returns < 0 error if the callback will never be called, otherwise | |
1551 | * the result of the lock will be communicated via the callback. | |
1552 | */ | |
1553 | int ocfs2_meta_lock_full(struct inode *inode, | |
1554 | struct ocfs2_journal_handle *handle, | |
1555 | struct buffer_head **ret_bh, | |
1556 | int ex, | |
1557 | int arg_flags) | |
1558 | { | |
1559 | int status, level, dlm_flags, acquired; | |
1560 | struct ocfs2_lock_res *lockres; | |
1561 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1562 | struct buffer_head *local_bh = NULL; | |
1563 | ||
1564 | BUG_ON(!inode); | |
1565 | ||
1566 | mlog_entry_void(); | |
1567 | ||
b0697053 MF |
1568 | mlog(0, "inode %llu, take %s META lock\n", |
1569 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1570 | ex ? "EXMODE" : "PRMODE"); |
1571 | ||
1572 | status = 0; | |
1573 | acquired = 0; | |
1574 | /* We'll allow faking a readonly metadata lock for | |
1575 | * rodevices. */ | |
1576 | if (ocfs2_is_hard_readonly(osb)) { | |
1577 | if (ex) | |
1578 | status = -EROFS; | |
1579 | goto bail; | |
1580 | } | |
1581 | ||
1582 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) | |
1583 | wait_event(osb->recovery_event, | |
1584 | ocfs2_node_map_is_empty(osb, &osb->recovery_map)); | |
1585 | ||
1586 | acquired = 0; | |
1587 | lockres = &OCFS2_I(inode)->ip_meta_lockres; | |
1588 | level = ex ? LKM_EXMODE : LKM_PRMODE; | |
1589 | dlm_flags = 0; | |
1590 | if (arg_flags & OCFS2_META_LOCK_NOQUEUE) | |
1591 | dlm_flags |= LKM_NOQUEUE; | |
1592 | ||
1593 | status = ocfs2_cluster_lock(osb, lockres, level, dlm_flags, arg_flags); | |
1594 | if (status < 0) { | |
1595 | if (status != -EAGAIN && status != -EIOCBRETRY) | |
1596 | mlog_errno(status); | |
1597 | goto bail; | |
1598 | } | |
1599 | ||
1600 | /* Notify the error cleanup path to drop the cluster lock. */ | |
1601 | acquired = 1; | |
1602 | ||
1603 | /* We wait twice because a node may have died while we were in | |
1604 | * the lower dlm layers. The second time though, we've | |
1605 | * committed to owning this lock so we don't allow signals to | |
1606 | * abort the operation. */ | |
1607 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) | |
1608 | wait_event(osb->recovery_event, | |
1609 | ocfs2_node_map_is_empty(osb, &osb->recovery_map)); | |
1610 | ||
24c19ef4 MF |
1611 | /* |
1612 | * We only see this flag if we're being called from | |
1613 | * ocfs2_read_locked_inode(). It means we're locking an inode | |
1614 | * which hasn't been populated yet, so clear the refresh flag | |
1615 | * and let the caller handle it. | |
1616 | */ | |
1617 | if (inode->i_state & I_NEW) { | |
1618 | status = 0; | |
1619 | ocfs2_complete_lock_res_refresh(lockres, 0); | |
1620 | goto bail; | |
1621 | } | |
1622 | ||
ccd979bd MF |
1623 | /* This is fun. The caller may want a bh back, or it may |
1624 | * not. ocfs2_meta_lock_update definitely wants one in, but | |
1625 | * may or may not read one, depending on what's in the | |
1626 | * LVB. The result of all of this is that we've *only* gone to | |
1627 | * disk if we have to, so the complexity is worthwhile. */ | |
1628 | status = ocfs2_meta_lock_update(inode, &local_bh); | |
1629 | if (status < 0) { | |
1630 | if (status != -ENOENT) | |
1631 | mlog_errno(status); | |
1632 | goto bail; | |
1633 | } | |
1634 | ||
1635 | if (ret_bh) { | |
1636 | status = ocfs2_assign_bh(inode, ret_bh, local_bh); | |
1637 | if (status < 0) { | |
1638 | mlog_errno(status); | |
1639 | goto bail; | |
1640 | } | |
1641 | } | |
1642 | ||
1643 | if (handle) { | |
1644 | status = ocfs2_handle_add_lock(handle, inode); | |
1645 | if (status < 0) | |
1646 | mlog_errno(status); | |
1647 | } | |
1648 | ||
1649 | bail: | |
1650 | if (status < 0) { | |
1651 | if (ret_bh && (*ret_bh)) { | |
1652 | brelse(*ret_bh); | |
1653 | *ret_bh = NULL; | |
1654 | } | |
1655 | if (acquired) | |
1656 | ocfs2_meta_unlock(inode, ex); | |
1657 | } | |
1658 | ||
1659 | if (local_bh) | |
1660 | brelse(local_bh); | |
1661 | ||
1662 | mlog_exit(status); | |
1663 | return status; | |
1664 | } | |
1665 | ||
1666 | /* | |
1667 | * This is working around a lock inversion between tasks acquiring DLM locks | |
1668 | * while holding a page lock and the vote thread which blocks dlm lock acquiry | |
1669 | * while acquiring page locks. | |
1670 | * | |
1671 | * ** These _with_page variantes are only intended to be called from aop | |
1672 | * methods that hold page locks and return a very specific *positive* error | |
1673 | * code that aop methods pass up to the VFS -- test for errors with != 0. ** | |
1674 | * | |
1675 | * The DLM is called such that it returns -EAGAIN if it would have blocked | |
1676 | * waiting for the vote thread. In that case we unlock our page so the vote | |
1677 | * thread can make progress. Once we've done this we have to return | |
1678 | * AOP_TRUNCATED_PAGE so the aop method that called us can bubble that back up | |
1679 | * into the VFS who will then immediately retry the aop call. | |
1680 | * | |
1681 | * We do a blocking lock and immediate unlock before returning, though, so that | |
1682 | * the lock has a great chance of being cached on this node by the time the VFS | |
1683 | * calls back to retry the aop. This has a potential to livelock as nodes | |
1684 | * ping locks back and forth, but that's a risk we're willing to take to avoid | |
1685 | * the lock inversion simply. | |
1686 | */ | |
1687 | int ocfs2_meta_lock_with_page(struct inode *inode, | |
1688 | struct ocfs2_journal_handle *handle, | |
1689 | struct buffer_head **ret_bh, | |
1690 | int ex, | |
1691 | struct page *page) | |
1692 | { | |
1693 | int ret; | |
1694 | ||
1695 | ret = ocfs2_meta_lock_full(inode, handle, ret_bh, ex, | |
1696 | OCFS2_LOCK_NONBLOCK); | |
1697 | if (ret == -EAGAIN) { | |
1698 | unlock_page(page); | |
1699 | if (ocfs2_meta_lock(inode, handle, ret_bh, ex) == 0) | |
1700 | ocfs2_meta_unlock(inode, ex); | |
1701 | ret = AOP_TRUNCATED_PAGE; | |
1702 | } | |
1703 | ||
1704 | return ret; | |
1705 | } | |
1706 | ||
1707 | void ocfs2_meta_unlock(struct inode *inode, | |
1708 | int ex) | |
1709 | { | |
1710 | int level = ex ? LKM_EXMODE : LKM_PRMODE; | |
1711 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres; | |
1712 | ||
1713 | mlog_entry_void(); | |
1714 | ||
b0697053 MF |
1715 | mlog(0, "inode %llu drop %s META lock\n", |
1716 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1717 | ex ? "EXMODE" : "PRMODE"); |
1718 | ||
1719 | if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) | |
1720 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); | |
1721 | ||
1722 | mlog_exit_void(); | |
1723 | } | |
1724 | ||
1725 | int ocfs2_super_lock(struct ocfs2_super *osb, | |
1726 | int ex) | |
1727 | { | |
1728 | int status; | |
1729 | int level = ex ? LKM_EXMODE : LKM_PRMODE; | |
1730 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; | |
1731 | struct buffer_head *bh; | |
1732 | struct ocfs2_slot_info *si = osb->slot_info; | |
1733 | ||
1734 | mlog_entry_void(); | |
1735 | ||
1736 | if (ocfs2_is_hard_readonly(osb)) | |
1737 | return -EROFS; | |
1738 | ||
1739 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); | |
1740 | if (status < 0) { | |
1741 | mlog_errno(status); | |
1742 | goto bail; | |
1743 | } | |
1744 | ||
1745 | /* The super block lock path is really in the best position to | |
1746 | * know when resources covered by the lock need to be | |
1747 | * refreshed, so we do it here. Of course, making sense of | |
1748 | * everything is up to the caller :) */ | |
1749 | status = ocfs2_should_refresh_lock_res(lockres); | |
1750 | if (status < 0) { | |
1751 | mlog_errno(status); | |
1752 | goto bail; | |
1753 | } | |
1754 | if (status) { | |
1755 | bh = si->si_bh; | |
1756 | status = ocfs2_read_block(osb, bh->b_blocknr, &bh, 0, | |
1757 | si->si_inode); | |
1758 | if (status == 0) | |
1759 | ocfs2_update_slot_info(si); | |
1760 | ||
1761 | ocfs2_complete_lock_res_refresh(lockres, status); | |
1762 | ||
1763 | if (status < 0) | |
1764 | mlog_errno(status); | |
1765 | } | |
1766 | bail: | |
1767 | mlog_exit(status); | |
1768 | return status; | |
1769 | } | |
1770 | ||
1771 | void ocfs2_super_unlock(struct ocfs2_super *osb, | |
1772 | int ex) | |
1773 | { | |
1774 | int level = ex ? LKM_EXMODE : LKM_PRMODE; | |
1775 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; | |
1776 | ||
1777 | ocfs2_cluster_unlock(osb, lockres, level); | |
1778 | } | |
1779 | ||
1780 | int ocfs2_rename_lock(struct ocfs2_super *osb) | |
1781 | { | |
1782 | int status; | |
1783 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; | |
1784 | ||
1785 | if (ocfs2_is_hard_readonly(osb)) | |
1786 | return -EROFS; | |
1787 | ||
1788 | status = ocfs2_cluster_lock(osb, lockres, LKM_EXMODE, 0, 0); | |
1789 | if (status < 0) | |
1790 | mlog_errno(status); | |
1791 | ||
1792 | return status; | |
1793 | } | |
1794 | ||
1795 | void ocfs2_rename_unlock(struct ocfs2_super *osb) | |
1796 | { | |
1797 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; | |
1798 | ||
1799 | ocfs2_cluster_unlock(osb, lockres, LKM_EXMODE); | |
1800 | } | |
1801 | ||
d680efe9 MF |
1802 | int ocfs2_dentry_lock(struct dentry *dentry, int ex) |
1803 | { | |
1804 | int ret; | |
1805 | int level = ex ? LKM_EXMODE : LKM_PRMODE; | |
1806 | struct ocfs2_dentry_lock *dl = dentry->d_fsdata; | |
1807 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); | |
1808 | ||
1809 | BUG_ON(!dl); | |
1810 | ||
1811 | if (ocfs2_is_hard_readonly(osb)) | |
1812 | return -EROFS; | |
1813 | ||
1814 | ret = ocfs2_cluster_lock(osb, &dl->dl_lockres, level, 0, 0); | |
1815 | if (ret < 0) | |
1816 | mlog_errno(ret); | |
1817 | ||
1818 | return ret; | |
1819 | } | |
1820 | ||
1821 | void ocfs2_dentry_unlock(struct dentry *dentry, int ex) | |
1822 | { | |
1823 | int level = ex ? LKM_EXMODE : LKM_PRMODE; | |
1824 | struct ocfs2_dentry_lock *dl = dentry->d_fsdata; | |
1825 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); | |
1826 | ||
1827 | ocfs2_cluster_unlock(osb, &dl->dl_lockres, level); | |
1828 | } | |
1829 | ||
ccd979bd MF |
1830 | /* Reference counting of the dlm debug structure. We want this because |
1831 | * open references on the debug inodes can live on after a mount, so | |
1832 | * we can't rely on the ocfs2_super to always exist. */ | |
1833 | static void ocfs2_dlm_debug_free(struct kref *kref) | |
1834 | { | |
1835 | struct ocfs2_dlm_debug *dlm_debug; | |
1836 | ||
1837 | dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt); | |
1838 | ||
1839 | kfree(dlm_debug); | |
1840 | } | |
1841 | ||
1842 | void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug) | |
1843 | { | |
1844 | if (dlm_debug) | |
1845 | kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free); | |
1846 | } | |
1847 | ||
1848 | static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug) | |
1849 | { | |
1850 | kref_get(&debug->d_refcnt); | |
1851 | } | |
1852 | ||
1853 | struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void) | |
1854 | { | |
1855 | struct ocfs2_dlm_debug *dlm_debug; | |
1856 | ||
1857 | dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL); | |
1858 | if (!dlm_debug) { | |
1859 | mlog_errno(-ENOMEM); | |
1860 | goto out; | |
1861 | } | |
1862 | ||
1863 | kref_init(&dlm_debug->d_refcnt); | |
1864 | INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking); | |
1865 | dlm_debug->d_locking_state = NULL; | |
1866 | out: | |
1867 | return dlm_debug; | |
1868 | } | |
1869 | ||
1870 | /* Access to this is arbitrated for us via seq_file->sem. */ | |
1871 | struct ocfs2_dlm_seq_priv { | |
1872 | struct ocfs2_dlm_debug *p_dlm_debug; | |
1873 | struct ocfs2_lock_res p_iter_res; | |
1874 | struct ocfs2_lock_res p_tmp_res; | |
1875 | }; | |
1876 | ||
1877 | static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start, | |
1878 | struct ocfs2_dlm_seq_priv *priv) | |
1879 | { | |
1880 | struct ocfs2_lock_res *iter, *ret = NULL; | |
1881 | struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug; | |
1882 | ||
1883 | assert_spin_locked(&ocfs2_dlm_tracking_lock); | |
1884 | ||
1885 | list_for_each_entry(iter, &start->l_debug_list, l_debug_list) { | |
1886 | /* discover the head of the list */ | |
1887 | if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) { | |
1888 | mlog(0, "End of list found, %p\n", ret); | |
1889 | break; | |
1890 | } | |
1891 | ||
1892 | /* We track our "dummy" iteration lockres' by a NULL | |
1893 | * l_ops field. */ | |
1894 | if (iter->l_ops != NULL) { | |
1895 | ret = iter; | |
1896 | break; | |
1897 | } | |
1898 | } | |
1899 | ||
1900 | return ret; | |
1901 | } | |
1902 | ||
1903 | static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos) | |
1904 | { | |
1905 | struct ocfs2_dlm_seq_priv *priv = m->private; | |
1906 | struct ocfs2_lock_res *iter; | |
1907 | ||
1908 | spin_lock(&ocfs2_dlm_tracking_lock); | |
1909 | iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv); | |
1910 | if (iter) { | |
1911 | /* Since lockres' have the lifetime of their container | |
1912 | * (which can be inodes, ocfs2_supers, etc) we want to | |
1913 | * copy this out to a temporary lockres while still | |
1914 | * under the spinlock. Obviously after this we can't | |
1915 | * trust any pointers on the copy returned, but that's | |
1916 | * ok as the information we want isn't typically held | |
1917 | * in them. */ | |
1918 | priv->p_tmp_res = *iter; | |
1919 | iter = &priv->p_tmp_res; | |
1920 | } | |
1921 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
1922 | ||
1923 | return iter; | |
1924 | } | |
1925 | ||
1926 | static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v) | |
1927 | { | |
1928 | } | |
1929 | ||
1930 | static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
1931 | { | |
1932 | struct ocfs2_dlm_seq_priv *priv = m->private; | |
1933 | struct ocfs2_lock_res *iter = v; | |
1934 | struct ocfs2_lock_res *dummy = &priv->p_iter_res; | |
1935 | ||
1936 | spin_lock(&ocfs2_dlm_tracking_lock); | |
1937 | iter = ocfs2_dlm_next_res(iter, priv); | |
1938 | list_del_init(&dummy->l_debug_list); | |
1939 | if (iter) { | |
1940 | list_add(&dummy->l_debug_list, &iter->l_debug_list); | |
1941 | priv->p_tmp_res = *iter; | |
1942 | iter = &priv->p_tmp_res; | |
1943 | } | |
1944 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
1945 | ||
1946 | return iter; | |
1947 | } | |
1948 | ||
1949 | /* So that debugfs.ocfs2 can determine which format is being used */ | |
1950 | #define OCFS2_DLM_DEBUG_STR_VERSION 1 | |
1951 | static int ocfs2_dlm_seq_show(struct seq_file *m, void *v) | |
1952 | { | |
1953 | int i; | |
1954 | char *lvb; | |
1955 | struct ocfs2_lock_res *lockres = v; | |
1956 | ||
1957 | if (!lockres) | |
1958 | return -EINVAL; | |
1959 | ||
d680efe9 MF |
1960 | seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION); |
1961 | ||
1962 | if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY) | |
1963 | seq_printf(m, "%.*s%08x\t", OCFS2_DENTRY_LOCK_INO_START - 1, | |
1964 | lockres->l_name, | |
1965 | (unsigned int)ocfs2_get_dentry_lock_ino(lockres)); | |
1966 | else | |
1967 | seq_printf(m, "%.*s\t", OCFS2_LOCK_ID_MAX_LEN, lockres->l_name); | |
1968 | ||
1969 | seq_printf(m, "%d\t" | |
ccd979bd MF |
1970 | "0x%lx\t" |
1971 | "0x%x\t" | |
1972 | "0x%x\t" | |
1973 | "%u\t" | |
1974 | "%u\t" | |
1975 | "%d\t" | |
1976 | "%d\t", | |
ccd979bd MF |
1977 | lockres->l_level, |
1978 | lockres->l_flags, | |
1979 | lockres->l_action, | |
1980 | lockres->l_unlock_action, | |
1981 | lockres->l_ro_holders, | |
1982 | lockres->l_ex_holders, | |
1983 | lockres->l_requested, | |
1984 | lockres->l_blocking); | |
1985 | ||
1986 | /* Dump the raw LVB */ | |
1987 | lvb = lockres->l_lksb.lvb; | |
1988 | for(i = 0; i < DLM_LVB_LEN; i++) | |
1989 | seq_printf(m, "0x%x\t", lvb[i]); | |
1990 | ||
1991 | /* End the line */ | |
1992 | seq_printf(m, "\n"); | |
1993 | return 0; | |
1994 | } | |
1995 | ||
1996 | static struct seq_operations ocfs2_dlm_seq_ops = { | |
1997 | .start = ocfs2_dlm_seq_start, | |
1998 | .stop = ocfs2_dlm_seq_stop, | |
1999 | .next = ocfs2_dlm_seq_next, | |
2000 | .show = ocfs2_dlm_seq_show, | |
2001 | }; | |
2002 | ||
2003 | static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file) | |
2004 | { | |
2005 | struct seq_file *seq = (struct seq_file *) file->private_data; | |
2006 | struct ocfs2_dlm_seq_priv *priv = seq->private; | |
2007 | struct ocfs2_lock_res *res = &priv->p_iter_res; | |
2008 | ||
2009 | ocfs2_remove_lockres_tracking(res); | |
2010 | ocfs2_put_dlm_debug(priv->p_dlm_debug); | |
2011 | return seq_release_private(inode, file); | |
2012 | } | |
2013 | ||
2014 | static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file) | |
2015 | { | |
2016 | int ret; | |
2017 | struct ocfs2_dlm_seq_priv *priv; | |
2018 | struct seq_file *seq; | |
2019 | struct ocfs2_super *osb; | |
2020 | ||
2021 | priv = kzalloc(sizeof(struct ocfs2_dlm_seq_priv), GFP_KERNEL); | |
2022 | if (!priv) { | |
2023 | ret = -ENOMEM; | |
2024 | mlog_errno(ret); | |
2025 | goto out; | |
2026 | } | |
2027 | osb = (struct ocfs2_super *) inode->u.generic_ip; | |
2028 | ocfs2_get_dlm_debug(osb->osb_dlm_debug); | |
2029 | priv->p_dlm_debug = osb->osb_dlm_debug; | |
2030 | INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list); | |
2031 | ||
2032 | ret = seq_open(file, &ocfs2_dlm_seq_ops); | |
2033 | if (ret) { | |
2034 | kfree(priv); | |
2035 | mlog_errno(ret); | |
2036 | goto out; | |
2037 | } | |
2038 | ||
2039 | seq = (struct seq_file *) file->private_data; | |
2040 | seq->private = priv; | |
2041 | ||
2042 | ocfs2_add_lockres_tracking(&priv->p_iter_res, | |
2043 | priv->p_dlm_debug); | |
2044 | ||
2045 | out: | |
2046 | return ret; | |
2047 | } | |
2048 | ||
4b6f5d20 | 2049 | static const struct file_operations ocfs2_dlm_debug_fops = { |
ccd979bd MF |
2050 | .open = ocfs2_dlm_debug_open, |
2051 | .release = ocfs2_dlm_debug_release, | |
2052 | .read = seq_read, | |
2053 | .llseek = seq_lseek, | |
2054 | }; | |
2055 | ||
2056 | static int ocfs2_dlm_init_debug(struct ocfs2_super *osb) | |
2057 | { | |
2058 | int ret = 0; | |
2059 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; | |
2060 | ||
2061 | dlm_debug->d_locking_state = debugfs_create_file("locking_state", | |
2062 | S_IFREG|S_IRUSR, | |
2063 | osb->osb_debug_root, | |
2064 | osb, | |
2065 | &ocfs2_dlm_debug_fops); | |
2066 | if (!dlm_debug->d_locking_state) { | |
2067 | ret = -EINVAL; | |
2068 | mlog(ML_ERROR, | |
2069 | "Unable to create locking state debugfs file.\n"); | |
2070 | goto out; | |
2071 | } | |
2072 | ||
2073 | ocfs2_get_dlm_debug(dlm_debug); | |
2074 | out: | |
2075 | return ret; | |
2076 | } | |
2077 | ||
2078 | static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb) | |
2079 | { | |
2080 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; | |
2081 | ||
2082 | if (dlm_debug) { | |
2083 | debugfs_remove(dlm_debug->d_locking_state); | |
2084 | ocfs2_put_dlm_debug(dlm_debug); | |
2085 | } | |
2086 | } | |
2087 | ||
2088 | int ocfs2_dlm_init(struct ocfs2_super *osb) | |
2089 | { | |
2090 | int status; | |
2091 | u32 dlm_key; | |
2092 | struct dlm_ctxt *dlm; | |
2093 | ||
2094 | mlog_entry_void(); | |
2095 | ||
2096 | status = ocfs2_dlm_init_debug(osb); | |
2097 | if (status < 0) { | |
2098 | mlog_errno(status); | |
2099 | goto bail; | |
2100 | } | |
2101 | ||
2102 | /* launch vote thread */ | |
78427043 | 2103 | osb->vote_task = kthread_run(ocfs2_vote_thread, osb, "ocfs2vote"); |
ccd979bd MF |
2104 | if (IS_ERR(osb->vote_task)) { |
2105 | status = PTR_ERR(osb->vote_task); | |
2106 | osb->vote_task = NULL; | |
2107 | mlog_errno(status); | |
2108 | goto bail; | |
2109 | } | |
2110 | ||
2111 | /* used by the dlm code to make message headers unique, each | |
2112 | * node in this domain must agree on this. */ | |
2113 | dlm_key = crc32_le(0, osb->uuid_str, strlen(osb->uuid_str)); | |
2114 | ||
2115 | /* for now, uuid == domain */ | |
2116 | dlm = dlm_register_domain(osb->uuid_str, dlm_key); | |
2117 | if (IS_ERR(dlm)) { | |
2118 | status = PTR_ERR(dlm); | |
2119 | mlog_errno(status); | |
2120 | goto bail; | |
2121 | } | |
2122 | ||
2123 | ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb); | |
2124 | ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb); | |
2125 | ||
2126 | dlm_register_eviction_cb(dlm, &osb->osb_eviction_cb); | |
2127 | ||
2128 | osb->dlm = dlm; | |
2129 | ||
2130 | status = 0; | |
2131 | bail: | |
2132 | if (status < 0) { | |
2133 | ocfs2_dlm_shutdown_debug(osb); | |
2134 | if (osb->vote_task) | |
2135 | kthread_stop(osb->vote_task); | |
2136 | } | |
2137 | ||
2138 | mlog_exit(status); | |
2139 | return status; | |
2140 | } | |
2141 | ||
2142 | void ocfs2_dlm_shutdown(struct ocfs2_super *osb) | |
2143 | { | |
2144 | mlog_entry_void(); | |
2145 | ||
2146 | dlm_unregister_eviction_cb(&osb->osb_eviction_cb); | |
2147 | ||
2148 | ocfs2_drop_osb_locks(osb); | |
2149 | ||
2150 | if (osb->vote_task) { | |
2151 | kthread_stop(osb->vote_task); | |
2152 | osb->vote_task = NULL; | |
2153 | } | |
2154 | ||
2155 | ocfs2_lock_res_free(&osb->osb_super_lockres); | |
2156 | ocfs2_lock_res_free(&osb->osb_rename_lockres); | |
2157 | ||
2158 | dlm_unregister_domain(osb->dlm); | |
2159 | osb->dlm = NULL; | |
2160 | ||
2161 | ocfs2_dlm_shutdown_debug(osb); | |
2162 | ||
2163 | mlog_exit_void(); | |
2164 | } | |
2165 | ||
2a45f2d1 | 2166 | static void ocfs2_unlock_ast(void *opaque, enum dlm_status status) |
ccd979bd MF |
2167 | { |
2168 | struct ocfs2_lock_res *lockres = opaque; | |
2169 | unsigned long flags; | |
2170 | ||
2171 | mlog_entry_void(); | |
2172 | ||
2173 | mlog(0, "UNLOCK AST called on lock %s, action = %d\n", lockres->l_name, | |
2174 | lockres->l_unlock_action); | |
2175 | ||
2176 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2177 | /* We tried to cancel a convert request, but it was already | |
2178 | * granted. All we want to do here is clear our unlock | |
2179 | * state. The wake_up call done at the bottom is redundant | |
2180 | * (ocfs2_prepare_cancel_convert doesn't sleep on this) but doesn't | |
2181 | * hurt anything anyway */ | |
2182 | if (status == DLM_CANCELGRANT && | |
2183 | lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { | |
2184 | mlog(0, "Got cancelgrant for %s\n", lockres->l_name); | |
2185 | ||
2186 | /* We don't clear the busy flag in this case as it | |
2187 | * should have been cleared by the ast which the dlm | |
2188 | * has called. */ | |
2189 | goto complete_unlock; | |
2190 | } | |
2191 | ||
2192 | if (status != DLM_NORMAL) { | |
2193 | mlog(ML_ERROR, "Dlm passes status %d for lock %s, " | |
2194 | "unlock_action %d\n", status, lockres->l_name, | |
2195 | lockres->l_unlock_action); | |
2196 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2197 | return; | |
2198 | } | |
2199 | ||
2200 | switch(lockres->l_unlock_action) { | |
2201 | case OCFS2_UNLOCK_CANCEL_CONVERT: | |
2202 | mlog(0, "Cancel convert success for %s\n", lockres->l_name); | |
2203 | lockres->l_action = OCFS2_AST_INVALID; | |
2204 | break; | |
2205 | case OCFS2_UNLOCK_DROP_LOCK: | |
2206 | lockres->l_level = LKM_IVMODE; | |
2207 | break; | |
2208 | default: | |
2209 | BUG(); | |
2210 | } | |
2211 | ||
2212 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
2213 | complete_unlock: | |
2214 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
2215 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2216 | ||
2217 | wake_up(&lockres->l_event); | |
2218 | ||
2219 | mlog_exit_void(); | |
2220 | } | |
2221 | ||
2222 | typedef void (ocfs2_pre_drop_cb_t)(struct ocfs2_lock_res *, void *); | |
2223 | ||
2224 | struct drop_lock_cb { | |
2225 | ocfs2_pre_drop_cb_t *drop_func; | |
2226 | void *drop_data; | |
2227 | }; | |
2228 | ||
2229 | static int ocfs2_drop_lock(struct ocfs2_super *osb, | |
2230 | struct ocfs2_lock_res *lockres, | |
2231 | struct drop_lock_cb *dcb) | |
2232 | { | |
2233 | enum dlm_status status; | |
2234 | unsigned long flags; | |
b80fc012 | 2235 | int lkm_flags = 0; |
ccd979bd MF |
2236 | |
2237 | /* We didn't get anywhere near actually using this lockres. */ | |
2238 | if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) | |
2239 | goto out; | |
2240 | ||
b80fc012 MF |
2241 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
2242 | lkm_flags |= LKM_VALBLK; | |
2243 | ||
ccd979bd MF |
2244 | spin_lock_irqsave(&lockres->l_lock, flags); |
2245 | ||
2246 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING), | |
2247 | "lockres %s, flags 0x%lx\n", | |
2248 | lockres->l_name, lockres->l_flags); | |
2249 | ||
2250 | while (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
2251 | mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = " | |
2252 | "%u, unlock_action = %u\n", | |
2253 | lockres->l_name, lockres->l_flags, lockres->l_action, | |
2254 | lockres->l_unlock_action); | |
2255 | ||
2256 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2257 | ||
2258 | /* XXX: Today we just wait on any busy | |
2259 | * locks... Perhaps we need to cancel converts in the | |
2260 | * future? */ | |
2261 | ocfs2_wait_on_busy_lock(lockres); | |
2262 | ||
2263 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2264 | } | |
2265 | ||
2266 | if (dcb) | |
2267 | dcb->drop_func(lockres, dcb->drop_data); | |
2268 | ||
2269 | if (lockres->l_flags & OCFS2_LOCK_BUSY) | |
2270 | mlog(ML_ERROR, "destroying busy lock: \"%s\"\n", | |
2271 | lockres->l_name); | |
2272 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) | |
2273 | mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name); | |
2274 | ||
2275 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { | |
2276 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2277 | goto out; | |
2278 | } | |
2279 | ||
2280 | lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED); | |
2281 | ||
2282 | /* make sure we never get here while waiting for an ast to | |
2283 | * fire. */ | |
2284 | BUG_ON(lockres->l_action != OCFS2_AST_INVALID); | |
2285 | ||
2286 | /* is this necessary? */ | |
2287 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
2288 | lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK; | |
2289 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2290 | ||
2291 | mlog(0, "lock %s\n", lockres->l_name); | |
2292 | ||
b80fc012 | 2293 | status = dlmunlock(osb->dlm, &lockres->l_lksb, lkm_flags, |
2a45f2d1 | 2294 | ocfs2_unlock_ast, lockres); |
ccd979bd MF |
2295 | if (status != DLM_NORMAL) { |
2296 | ocfs2_log_dlm_error("dlmunlock", status, lockres); | |
2297 | mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags); | |
2298 | dlm_print_one_lock(lockres->l_lksb.lockid); | |
2299 | BUG(); | |
2300 | } | |
2301 | mlog(0, "lock %s, successfull return from dlmunlock\n", | |
2302 | lockres->l_name); | |
2303 | ||
2304 | ocfs2_wait_on_busy_lock(lockres); | |
2305 | out: | |
2306 | mlog_exit(0); | |
2307 | return 0; | |
2308 | } | |
2309 | ||
2310 | /* Mark the lockres as being dropped. It will no longer be | |
2311 | * queued if blocking, but we still may have to wait on it | |
2312 | * being dequeued from the vote thread before we can consider | |
2313 | * it safe to drop. | |
2314 | * | |
2315 | * You can *not* attempt to call cluster_lock on this lockres anymore. */ | |
2316 | void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres) | |
2317 | { | |
2318 | int status; | |
2319 | struct ocfs2_mask_waiter mw; | |
2320 | unsigned long flags; | |
2321 | ||
2322 | ocfs2_init_mask_waiter(&mw); | |
2323 | ||
2324 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2325 | lockres->l_flags |= OCFS2_LOCK_FREEING; | |
2326 | while (lockres->l_flags & OCFS2_LOCK_QUEUED) { | |
2327 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0); | |
2328 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2329 | ||
2330 | mlog(0, "Waiting on lockres %s\n", lockres->l_name); | |
2331 | ||
2332 | status = ocfs2_wait_for_mask(&mw); | |
2333 | if (status) | |
2334 | mlog_errno(status); | |
2335 | ||
2336 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2337 | } | |
2338 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2339 | } | |
2340 | ||
d680efe9 MF |
2341 | void ocfs2_simple_drop_lockres(struct ocfs2_super *osb, |
2342 | struct ocfs2_lock_res *lockres) | |
ccd979bd | 2343 | { |
d680efe9 | 2344 | int ret; |
ccd979bd | 2345 | |
d680efe9 MF |
2346 | ocfs2_mark_lockres_freeing(lockres); |
2347 | ret = ocfs2_drop_lock(osb, lockres, NULL); | |
2348 | if (ret) | |
2349 | mlog_errno(ret); | |
2350 | } | |
ccd979bd | 2351 | |
d680efe9 MF |
2352 | static void ocfs2_drop_osb_locks(struct ocfs2_super *osb) |
2353 | { | |
2354 | ocfs2_simple_drop_lockres(osb, &osb->osb_super_lockres); | |
2355 | ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres); | |
ccd979bd MF |
2356 | } |
2357 | ||
2358 | static void ocfs2_meta_pre_drop(struct ocfs2_lock_res *lockres, void *data) | |
2359 | { | |
2360 | struct inode *inode = data; | |
2361 | ||
2362 | /* the metadata lock requires a bit more work as we have an | |
2363 | * LVB to worry about. */ | |
2364 | if (lockres->l_flags & OCFS2_LOCK_ATTACHED && | |
2365 | lockres->l_level == LKM_EXMODE && | |
2366 | !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) | |
2367 | __ocfs2_stuff_meta_lvb(inode); | |
2368 | } | |
2369 | ||
2370 | int ocfs2_drop_inode_locks(struct inode *inode) | |
2371 | { | |
2372 | int status, err; | |
2373 | struct drop_lock_cb meta_dcb = { ocfs2_meta_pre_drop, inode, }; | |
2374 | ||
2375 | mlog_entry_void(); | |
2376 | ||
2377 | /* No need to call ocfs2_mark_lockres_freeing here - | |
2378 | * ocfs2_clear_inode has done it for us. */ | |
2379 | ||
2380 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
2381 | &OCFS2_I(inode)->ip_data_lockres, | |
2382 | NULL); | |
2383 | if (err < 0) | |
2384 | mlog_errno(err); | |
2385 | ||
2386 | status = err; | |
2387 | ||
2388 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
2389 | &OCFS2_I(inode)->ip_meta_lockres, | |
2390 | &meta_dcb); | |
2391 | if (err < 0) | |
2392 | mlog_errno(err); | |
2393 | if (err < 0 && !status) | |
2394 | status = err; | |
2395 | ||
2396 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
2397 | &OCFS2_I(inode)->ip_rw_lockres, | |
2398 | NULL); | |
2399 | if (err < 0) | |
2400 | mlog_errno(err); | |
2401 | if (err < 0 && !status) | |
2402 | status = err; | |
2403 | ||
2404 | mlog_exit(status); | |
2405 | return status; | |
2406 | } | |
2407 | ||
2408 | static void ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres, | |
2409 | int new_level) | |
2410 | { | |
2411 | assert_spin_locked(&lockres->l_lock); | |
2412 | ||
2413 | BUG_ON(lockres->l_blocking <= LKM_NLMODE); | |
2414 | ||
2415 | if (lockres->l_level <= new_level) { | |
2416 | mlog(ML_ERROR, "lockres->l_level (%u) <= new_level (%u)\n", | |
2417 | lockres->l_level, new_level); | |
2418 | BUG(); | |
2419 | } | |
2420 | ||
2421 | mlog(0, "lock %s, new_level = %d, l_blocking = %d\n", | |
2422 | lockres->l_name, new_level, lockres->l_blocking); | |
2423 | ||
2424 | lockres->l_action = OCFS2_AST_DOWNCONVERT; | |
2425 | lockres->l_requested = new_level; | |
2426 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
2427 | } | |
2428 | ||
2429 | static int ocfs2_downconvert_lock(struct ocfs2_super *osb, | |
2430 | struct ocfs2_lock_res *lockres, | |
2431 | int new_level, | |
2432 | int lvb) | |
2433 | { | |
2434 | int ret, dlm_flags = LKM_CONVERT; | |
2435 | enum dlm_status status; | |
2436 | ||
2437 | mlog_entry_void(); | |
2438 | ||
2439 | if (lvb) | |
2440 | dlm_flags |= LKM_VALBLK; | |
2441 | ||
2442 | status = dlmlock(osb->dlm, | |
2443 | new_level, | |
2444 | &lockres->l_lksb, | |
2445 | dlm_flags, | |
2446 | lockres->l_name, | |
f0681062 | 2447 | OCFS2_LOCK_ID_MAX_LEN - 1, |
e92d57df | 2448 | ocfs2_locking_ast, |
ccd979bd | 2449 | lockres, |
aa2623ad | 2450 | ocfs2_blocking_ast); |
ccd979bd MF |
2451 | if (status != DLM_NORMAL) { |
2452 | ocfs2_log_dlm_error("dlmlock", status, lockres); | |
2453 | ret = -EINVAL; | |
2454 | ocfs2_recover_from_dlm_error(lockres, 1); | |
2455 | goto bail; | |
2456 | } | |
2457 | ||
2458 | ret = 0; | |
2459 | bail: | |
2460 | mlog_exit(ret); | |
2461 | return ret; | |
2462 | } | |
2463 | ||
2464 | /* returns 1 when the caller should unlock and call dlmunlock */ | |
2465 | static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb, | |
2466 | struct ocfs2_lock_res *lockres) | |
2467 | { | |
2468 | assert_spin_locked(&lockres->l_lock); | |
2469 | ||
2470 | mlog_entry_void(); | |
2471 | mlog(0, "lock %s\n", lockres->l_name); | |
2472 | ||
2473 | if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { | |
2474 | /* If we're already trying to cancel a lock conversion | |
2475 | * then just drop the spinlock and allow the caller to | |
2476 | * requeue this lock. */ | |
2477 | ||
2478 | mlog(0, "Lockres %s, skip convert\n", lockres->l_name); | |
2479 | return 0; | |
2480 | } | |
2481 | ||
2482 | /* were we in a convert when we got the bast fire? */ | |
2483 | BUG_ON(lockres->l_action != OCFS2_AST_CONVERT && | |
2484 | lockres->l_action != OCFS2_AST_DOWNCONVERT); | |
2485 | /* set things up for the unlockast to know to just | |
2486 | * clear out the ast_action and unset busy, etc. */ | |
2487 | lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT; | |
2488 | ||
2489 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY), | |
2490 | "lock %s, invalid flags: 0x%lx\n", | |
2491 | lockres->l_name, lockres->l_flags); | |
2492 | ||
2493 | return 1; | |
2494 | } | |
2495 | ||
2496 | static int ocfs2_cancel_convert(struct ocfs2_super *osb, | |
2497 | struct ocfs2_lock_res *lockres) | |
2498 | { | |
2499 | int ret; | |
2500 | enum dlm_status status; | |
2501 | ||
2502 | mlog_entry_void(); | |
2503 | mlog(0, "lock %s\n", lockres->l_name); | |
2504 | ||
2505 | ret = 0; | |
2506 | status = dlmunlock(osb->dlm, | |
2507 | &lockres->l_lksb, | |
2508 | LKM_CANCEL, | |
2a45f2d1 | 2509 | ocfs2_unlock_ast, |
ccd979bd MF |
2510 | lockres); |
2511 | if (status != DLM_NORMAL) { | |
2512 | ocfs2_log_dlm_error("dlmunlock", status, lockres); | |
2513 | ret = -EINVAL; | |
2514 | ocfs2_recover_from_dlm_error(lockres, 0); | |
2515 | } | |
2516 | ||
2517 | mlog(0, "lock %s return from dlmunlock\n", lockres->l_name); | |
2518 | ||
2519 | mlog_exit(ret); | |
2520 | return ret; | |
2521 | } | |
2522 | ||
2523 | static inline int ocfs2_can_downconvert_meta_lock(struct inode *inode, | |
2524 | struct ocfs2_lock_res *lockres, | |
2525 | int new_level) | |
2526 | { | |
2527 | int ret; | |
2528 | ||
2529 | mlog_entry_void(); | |
2530 | ||
2531 | BUG_ON(new_level != LKM_NLMODE && new_level != LKM_PRMODE); | |
2532 | ||
2533 | if (lockres->l_flags & OCFS2_LOCK_REFRESHING) { | |
2534 | ret = 0; | |
2535 | mlog(0, "lockres %s currently being refreshed -- backing " | |
2536 | "off!\n", lockres->l_name); | |
2537 | } else if (new_level == LKM_PRMODE) | |
2538 | ret = !lockres->l_ex_holders && | |
2539 | ocfs2_inode_fully_checkpointed(inode); | |
2540 | else /* Must be NLMODE we're converting to. */ | |
2541 | ret = !lockres->l_ro_holders && !lockres->l_ex_holders && | |
2542 | ocfs2_inode_fully_checkpointed(inode); | |
2543 | ||
2544 | mlog_exit(ret); | |
2545 | return ret; | |
2546 | } | |
2547 | ||
2548 | static int ocfs2_do_unblock_meta(struct inode *inode, | |
2549 | int *requeue) | |
2550 | { | |
2551 | int new_level; | |
2552 | int set_lvb = 0; | |
2553 | int ret = 0; | |
2554 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres; | |
2555 | unsigned long flags; | |
2556 | ||
2557 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
2558 | ||
2559 | mlog_entry_void(); | |
2560 | ||
2561 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2562 | ||
2563 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
2564 | ||
2565 | mlog(0, "l_level=%d, l_blocking=%d\n", lockres->l_level, | |
2566 | lockres->l_blocking); | |
2567 | ||
2568 | BUG_ON(lockres->l_level != LKM_EXMODE && | |
2569 | lockres->l_level != LKM_PRMODE); | |
2570 | ||
2571 | if (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
2572 | *requeue = 1; | |
2573 | ret = ocfs2_prepare_cancel_convert(osb, lockres); | |
2574 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2575 | if (ret) { | |
2576 | ret = ocfs2_cancel_convert(osb, lockres); | |
2577 | if (ret < 0) | |
2578 | mlog_errno(ret); | |
2579 | } | |
2580 | goto leave; | |
2581 | } | |
2582 | ||
2583 | new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking); | |
2584 | ||
2585 | mlog(0, "l_level=%d, l_blocking=%d, new_level=%d\n", | |
2586 | lockres->l_level, lockres->l_blocking, new_level); | |
2587 | ||
2588 | if (ocfs2_can_downconvert_meta_lock(inode, lockres, new_level)) { | |
2589 | if (lockres->l_level == LKM_EXMODE) | |
2590 | set_lvb = 1; | |
2591 | ||
2592 | /* If the lock hasn't been refreshed yet (rare), then | |
2593 | * our memory inode values are old and we skip | |
2594 | * stuffing the lvb. There's no need to actually clear | |
2595 | * out the lvb here as it's value is still valid. */ | |
2596 | if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) { | |
2597 | if (set_lvb) | |
2598 | __ocfs2_stuff_meta_lvb(inode); | |
2599 | } else | |
2600 | mlog(0, "lockres %s: downconverting stale lock!\n", | |
2601 | lockres->l_name); | |
2602 | ||
2603 | mlog(0, "calling ocfs2_downconvert_lock with l_level=%d, " | |
2604 | "l_blocking=%d, new_level=%d\n", | |
2605 | lockres->l_level, lockres->l_blocking, new_level); | |
2606 | ||
2607 | ocfs2_prepare_downconvert(lockres, new_level); | |
2608 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2609 | ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb); | |
2610 | goto leave; | |
2611 | } | |
2612 | if (!ocfs2_inode_fully_checkpointed(inode)) | |
2613 | ocfs2_start_checkpoint(osb); | |
2614 | ||
2615 | *requeue = 1; | |
2616 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2617 | ret = 0; | |
2618 | leave: | |
2619 | mlog_exit(ret); | |
2620 | return ret; | |
2621 | } | |
2622 | ||
2623 | static int ocfs2_generic_unblock_lock(struct ocfs2_super *osb, | |
2624 | struct ocfs2_lock_res *lockres, | |
d680efe9 | 2625 | struct ocfs2_unblock_ctl *ctl, |
ccd979bd MF |
2626 | ocfs2_convert_worker_t *worker) |
2627 | { | |
2628 | unsigned long flags; | |
2629 | int blocking; | |
2630 | int new_level; | |
2631 | int ret = 0; | |
2632 | ||
2633 | mlog_entry_void(); | |
2634 | ||
2635 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2636 | ||
2637 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
2638 | ||
2639 | recheck: | |
2640 | if (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
d680efe9 | 2641 | ctl->requeue = 1; |
ccd979bd MF |
2642 | ret = ocfs2_prepare_cancel_convert(osb, lockres); |
2643 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2644 | if (ret) { | |
2645 | ret = ocfs2_cancel_convert(osb, lockres); | |
2646 | if (ret < 0) | |
2647 | mlog_errno(ret); | |
2648 | } | |
2649 | goto leave; | |
2650 | } | |
2651 | ||
2652 | /* if we're blocking an exclusive and we have *any* holders, | |
2653 | * then requeue. */ | |
2654 | if ((lockres->l_blocking == LKM_EXMODE) | |
f7fbfdd1 MF |
2655 | && (lockres->l_ex_holders || lockres->l_ro_holders)) |
2656 | goto leave_requeue; | |
ccd979bd MF |
2657 | |
2658 | /* If it's a PR we're blocking, then only | |
2659 | * requeue if we've got any EX holders */ | |
2660 | if (lockres->l_blocking == LKM_PRMODE && | |
f7fbfdd1 MF |
2661 | lockres->l_ex_holders) |
2662 | goto leave_requeue; | |
2663 | ||
2664 | /* | |
2665 | * Can we get a lock in this state if the holder counts are | |
2666 | * zero? The meta data unblock code used to check this. | |
2667 | */ | |
2668 | if ((lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) | |
2669 | && (lockres->l_flags & OCFS2_LOCK_REFRESHING)) | |
2670 | goto leave_requeue; | |
ccd979bd | 2671 | |
16d5b956 MF |
2672 | new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking); |
2673 | ||
2674 | if (lockres->l_ops->check_downconvert | |
2675 | && !lockres->l_ops->check_downconvert(lockres, new_level)) | |
2676 | goto leave_requeue; | |
2677 | ||
ccd979bd MF |
2678 | /* If we get here, then we know that there are no more |
2679 | * incompatible holders (and anyone asking for an incompatible | |
2680 | * lock is blocked). We can now downconvert the lock */ | |
2681 | if (!worker) | |
2682 | goto downconvert; | |
2683 | ||
2684 | /* Some lockres types want to do a bit of work before | |
2685 | * downconverting a lock. Allow that here. The worker function | |
2686 | * may sleep, so we save off a copy of what we're blocking as | |
2687 | * it may change while we're not holding the spin lock. */ | |
2688 | blocking = lockres->l_blocking; | |
2689 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2690 | ||
d680efe9 MF |
2691 | ctl->unblock_action = worker(lockres, blocking); |
2692 | ||
2693 | if (ctl->unblock_action == UNBLOCK_STOP_POST) | |
2694 | goto leave; | |
ccd979bd MF |
2695 | |
2696 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2697 | if (blocking != lockres->l_blocking) { | |
2698 | /* If this changed underneath us, then we can't drop | |
2699 | * it just yet. */ | |
2700 | goto recheck; | |
2701 | } | |
2702 | ||
2703 | downconvert: | |
d680efe9 | 2704 | ctl->requeue = 0; |
ccd979bd MF |
2705 | |
2706 | ocfs2_prepare_downconvert(lockres, new_level); | |
2707 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2708 | ret = ocfs2_downconvert_lock(osb, lockres, new_level, 0); | |
2709 | leave: | |
2710 | mlog_exit(ret); | |
2711 | return ret; | |
f7fbfdd1 MF |
2712 | |
2713 | leave_requeue: | |
2714 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2715 | ctl->requeue = 1; | |
2716 | ||
2717 | mlog_exit(0); | |
2718 | return 0; | |
ccd979bd MF |
2719 | } |
2720 | ||
d680efe9 MF |
2721 | static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, |
2722 | int blocking) | |
ccd979bd MF |
2723 | { |
2724 | struct inode *inode; | |
2725 | struct address_space *mapping; | |
2726 | ||
ccd979bd MF |
2727 | inode = ocfs2_lock_res_inode(lockres); |
2728 | mapping = inode->i_mapping; | |
2729 | ||
2730 | if (filemap_fdatawrite(mapping)) { | |
b0697053 MF |
2731 | mlog(ML_ERROR, "Could not sync inode %llu for downconvert!", |
2732 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
ccd979bd MF |
2733 | } |
2734 | sync_mapping_buffers(mapping); | |
2735 | if (blocking == LKM_EXMODE) { | |
2736 | truncate_inode_pages(mapping, 0); | |
2737 | unmap_mapping_range(mapping, 0, 0, 0); | |
2738 | } else { | |
2739 | /* We only need to wait on the I/O if we're not also | |
2740 | * truncating pages because truncate_inode_pages waits | |
2741 | * for us above. We don't truncate pages if we're | |
2742 | * blocking anything < EXMODE because we want to keep | |
2743 | * them around in that case. */ | |
2744 | filemap_fdatawait(mapping); | |
2745 | } | |
2746 | ||
d680efe9 | 2747 | return UNBLOCK_CONTINUE; |
ccd979bd MF |
2748 | } |
2749 | ||
2750 | int ocfs2_unblock_data(struct ocfs2_lock_res *lockres, | |
d680efe9 | 2751 | struct ocfs2_unblock_ctl *ctl) |
ccd979bd MF |
2752 | { |
2753 | int status; | |
2754 | struct inode *inode; | |
2755 | struct ocfs2_super *osb; | |
2756 | ||
2757 | mlog_entry_void(); | |
2758 | ||
2759 | inode = ocfs2_lock_res_inode(lockres); | |
2760 | osb = OCFS2_SB(inode->i_sb); | |
2761 | ||
b0697053 MF |
2762 | mlog(0, "unblock inode %llu\n", |
2763 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
ccd979bd | 2764 | |
d680efe9 | 2765 | status = ocfs2_generic_unblock_lock(osb, lockres, ctl, |
ccd979bd MF |
2766 | ocfs2_data_convert_worker); |
2767 | if (status < 0) | |
2768 | mlog_errno(status); | |
2769 | ||
b0697053 | 2770 | mlog(0, "inode %llu, requeue = %d\n", |
d680efe9 | 2771 | (unsigned long long)OCFS2_I(inode)->ip_blkno, ctl->requeue); |
ccd979bd MF |
2772 | |
2773 | mlog_exit(status); | |
2774 | return status; | |
2775 | } | |
2776 | ||
2777 | static int ocfs2_unblock_inode_lock(struct ocfs2_lock_res *lockres, | |
d680efe9 | 2778 | struct ocfs2_unblock_ctl *ctl) |
ccd979bd MF |
2779 | { |
2780 | int status; | |
2781 | struct inode *inode; | |
2782 | ||
2783 | mlog_entry_void(); | |
2784 | ||
2785 | mlog(0, "Unblock lockres %s\n", lockres->l_name); | |
2786 | ||
2787 | inode = ocfs2_lock_res_inode(lockres); | |
2788 | ||
2789 | status = ocfs2_generic_unblock_lock(OCFS2_SB(inode->i_sb), | |
d680efe9 | 2790 | lockres, ctl, NULL); |
ccd979bd MF |
2791 | if (status < 0) |
2792 | mlog_errno(status); | |
2793 | ||
2794 | mlog_exit(status); | |
2795 | return status; | |
2796 | } | |
2797 | ||
d680efe9 MF |
2798 | static int ocfs2_unblock_meta(struct ocfs2_lock_res *lockres, |
2799 | struct ocfs2_unblock_ctl *ctl) | |
ccd979bd MF |
2800 | { |
2801 | int status; | |
2802 | struct inode *inode; | |
2803 | ||
2804 | mlog_entry_void(); | |
2805 | ||
2806 | inode = ocfs2_lock_res_inode(lockres); | |
2807 | ||
b0697053 MF |
2808 | mlog(0, "unblock inode %llu\n", |
2809 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
ccd979bd | 2810 | |
d680efe9 | 2811 | status = ocfs2_do_unblock_meta(inode, &ctl->requeue); |
ccd979bd MF |
2812 | if (status < 0) |
2813 | mlog_errno(status); | |
2814 | ||
b0697053 | 2815 | mlog(0, "inode %llu, requeue = %d\n", |
d680efe9 | 2816 | (unsigned long long)OCFS2_I(inode)->ip_blkno, ctl->requeue); |
ccd979bd MF |
2817 | |
2818 | mlog_exit(status); | |
2819 | return status; | |
2820 | } | |
2821 | ||
d680efe9 MF |
2822 | /* |
2823 | * Does the final reference drop on our dentry lock. Right now this | |
2824 | * happens in the vote thread, but we could choose to simplify the | |
2825 | * dlmglue API and push these off to the ocfs2_wq in the future. | |
2826 | */ | |
2827 | static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, | |
2828 | struct ocfs2_lock_res *lockres) | |
2829 | { | |
2830 | struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); | |
2831 | ocfs2_dentry_lock_put(osb, dl); | |
2832 | } | |
2833 | ||
2834 | /* | |
2835 | * d_delete() matching dentries before the lock downconvert. | |
2836 | * | |
2837 | * At this point, any process waiting to destroy the | |
2838 | * dentry_lock due to last ref count is stopped by the | |
2839 | * OCFS2_LOCK_QUEUED flag. | |
2840 | * | |
2841 | * We have two potential problems | |
2842 | * | |
2843 | * 1) If we do the last reference drop on our dentry_lock (via dput) | |
2844 | * we'll wind up in ocfs2_release_dentry_lock(), waiting on | |
2845 | * the downconvert to finish. Instead we take an elevated | |
2846 | * reference and push the drop until after we've completed our | |
2847 | * unblock processing. | |
2848 | * | |
2849 | * 2) There might be another process with a final reference, | |
2850 | * waiting on us to finish processing. If this is the case, we | |
2851 | * detect it and exit out - there's no more dentries anyway. | |
2852 | */ | |
2853 | static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, | |
2854 | int blocking) | |
2855 | { | |
2856 | struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); | |
2857 | struct ocfs2_inode_info *oi = OCFS2_I(dl->dl_inode); | |
2858 | struct dentry *dentry; | |
2859 | unsigned long flags; | |
2860 | int extra_ref = 0; | |
2861 | ||
2862 | /* | |
2863 | * This node is blocking another node from getting a read | |
2864 | * lock. This happens when we've renamed within a | |
2865 | * directory. We've forced the other nodes to d_delete(), but | |
2866 | * we never actually dropped our lock because it's still | |
2867 | * valid. The downconvert code will retain a PR for this node, | |
2868 | * so there's no further work to do. | |
2869 | */ | |
2870 | if (blocking == LKM_PRMODE) | |
2871 | return UNBLOCK_CONTINUE; | |
2872 | ||
2873 | /* | |
2874 | * Mark this inode as potentially orphaned. The code in | |
2875 | * ocfs2_delete_inode() will figure out whether it actually | |
2876 | * needs to be freed or not. | |
2877 | */ | |
2878 | spin_lock(&oi->ip_lock); | |
2879 | oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED; | |
2880 | spin_unlock(&oi->ip_lock); | |
2881 | ||
2882 | /* | |
2883 | * Yuck. We need to make sure however that the check of | |
2884 | * OCFS2_LOCK_FREEING and the extra reference are atomic with | |
2885 | * respect to a reference decrement or the setting of that | |
2886 | * flag. | |
2887 | */ | |
2888 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2889 | spin_lock(&dentry_attach_lock); | |
2890 | if (!(lockres->l_flags & OCFS2_LOCK_FREEING) | |
2891 | && dl->dl_count) { | |
2892 | dl->dl_count++; | |
2893 | extra_ref = 1; | |
2894 | } | |
2895 | spin_unlock(&dentry_attach_lock); | |
2896 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2897 | ||
2898 | mlog(0, "extra_ref = %d\n", extra_ref); | |
2899 | ||
2900 | /* | |
2901 | * We have a process waiting on us in ocfs2_dentry_iput(), | |
2902 | * which means we can't have any more outstanding | |
2903 | * aliases. There's no need to do any more work. | |
2904 | */ | |
2905 | if (!extra_ref) | |
2906 | return UNBLOCK_CONTINUE; | |
2907 | ||
2908 | spin_lock(&dentry_attach_lock); | |
2909 | while (1) { | |
2910 | dentry = ocfs2_find_local_alias(dl->dl_inode, | |
2911 | dl->dl_parent_blkno, 1); | |
2912 | if (!dentry) | |
2913 | break; | |
2914 | spin_unlock(&dentry_attach_lock); | |
2915 | ||
2916 | mlog(0, "d_delete(%.*s);\n", dentry->d_name.len, | |
2917 | dentry->d_name.name); | |
2918 | ||
2919 | /* | |
2920 | * The following dcache calls may do an | |
2921 | * iput(). Normally we don't want that from the | |
2922 | * downconverting thread, but in this case it's ok | |
2923 | * because the requesting node already has an | |
2924 | * exclusive lock on the inode, so it can't be queued | |
2925 | * for a downconvert. | |
2926 | */ | |
2927 | d_delete(dentry); | |
2928 | dput(dentry); | |
2929 | ||
2930 | spin_lock(&dentry_attach_lock); | |
2931 | } | |
2932 | spin_unlock(&dentry_attach_lock); | |
2933 | ||
2934 | /* | |
2935 | * If we are the last holder of this dentry lock, there is no | |
2936 | * reason to downconvert so skip straight to the unlock. | |
2937 | */ | |
2938 | if (dl->dl_count == 1) | |
2939 | return UNBLOCK_STOP_POST; | |
2940 | ||
2941 | return UNBLOCK_CONTINUE_POST; | |
2942 | } | |
2943 | ||
2944 | static int ocfs2_unblock_dentry_lock(struct ocfs2_lock_res *lockres, | |
2945 | struct ocfs2_unblock_ctl *ctl) | |
2946 | { | |
2947 | int ret; | |
2948 | struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); | |
2949 | struct ocfs2_super *osb = OCFS2_SB(dl->dl_inode->i_sb); | |
2950 | ||
2951 | mlog(0, "unblock dentry lock: %llu\n", | |
2952 | (unsigned long long)OCFS2_I(dl->dl_inode)->ip_blkno); | |
2953 | ||
2954 | ret = ocfs2_generic_unblock_lock(osb, | |
2955 | lockres, | |
2956 | ctl, | |
2957 | ocfs2_dentry_convert_worker); | |
2958 | if (ret < 0) | |
2959 | mlog_errno(ret); | |
2960 | ||
2961 | mlog(0, "requeue = %d, post = %d\n", ctl->requeue, ctl->unblock_action); | |
2962 | ||
2963 | return ret; | |
2964 | } | |
2965 | ||
ccd979bd MF |
2966 | /* Generic unblock function for any lockres whose private data is an |
2967 | * ocfs2_super pointer. */ | |
2968 | static int ocfs2_unblock_osb_lock(struct ocfs2_lock_res *lockres, | |
d680efe9 | 2969 | struct ocfs2_unblock_ctl *ctl) |
ccd979bd MF |
2970 | { |
2971 | int status; | |
2972 | struct ocfs2_super *osb; | |
2973 | ||
2974 | mlog_entry_void(); | |
2975 | ||
2976 | mlog(0, "Unblock lockres %s\n", lockres->l_name); | |
2977 | ||
aa2623ad | 2978 | osb = ocfs2_get_lockres_osb(lockres); |
ccd979bd MF |
2979 | |
2980 | status = ocfs2_generic_unblock_lock(osb, | |
2981 | lockres, | |
d680efe9 | 2982 | ctl, |
ccd979bd MF |
2983 | NULL); |
2984 | if (status < 0) | |
2985 | mlog_errno(status); | |
2986 | ||
2987 | mlog_exit(status); | |
2988 | return status; | |
2989 | } | |
2990 | ||
2991 | void ocfs2_process_blocked_lock(struct ocfs2_super *osb, | |
2992 | struct ocfs2_lock_res *lockres) | |
2993 | { | |
2994 | int status; | |
d680efe9 | 2995 | struct ocfs2_unblock_ctl ctl = {0, 0,}; |
ccd979bd MF |
2996 | unsigned long flags; |
2997 | ||
2998 | /* Our reference to the lockres in this function can be | |
2999 | * considered valid until we remove the OCFS2_LOCK_QUEUED | |
3000 | * flag. */ | |
3001 | ||
3002 | mlog_entry_void(); | |
3003 | ||
3004 | BUG_ON(!lockres); | |
3005 | BUG_ON(!lockres->l_ops); | |
3006 | BUG_ON(!lockres->l_ops->unblock); | |
3007 | ||
3008 | mlog(0, "lockres %s blocked.\n", lockres->l_name); | |
3009 | ||
3010 | /* Detect whether a lock has been marked as going away while | |
3011 | * the vote thread was processing other things. A lock can | |
3012 | * still be marked with OCFS2_LOCK_FREEING after this check, | |
3013 | * but short circuiting here will still save us some | |
3014 | * performance. */ | |
3015 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3016 | if (lockres->l_flags & OCFS2_LOCK_FREEING) | |
3017 | goto unqueue; | |
3018 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3019 | ||
d680efe9 | 3020 | status = lockres->l_ops->unblock(lockres, &ctl); |
ccd979bd MF |
3021 | if (status < 0) |
3022 | mlog_errno(status); | |
3023 | ||
3024 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3025 | unqueue: | |
d680efe9 | 3026 | if (lockres->l_flags & OCFS2_LOCK_FREEING || !ctl.requeue) { |
ccd979bd MF |
3027 | lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED); |
3028 | } else | |
3029 | ocfs2_schedule_blocked_lock(osb, lockres); | |
3030 | ||
3031 | mlog(0, "lockres %s, requeue = %s.\n", lockres->l_name, | |
d680efe9 | 3032 | ctl.requeue ? "yes" : "no"); |
ccd979bd MF |
3033 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
3034 | ||
d680efe9 MF |
3035 | if (ctl.unblock_action != UNBLOCK_CONTINUE |
3036 | && lockres->l_ops->post_unlock) | |
3037 | lockres->l_ops->post_unlock(osb, lockres); | |
3038 | ||
ccd979bd MF |
3039 | mlog_exit_void(); |
3040 | } | |
3041 | ||
3042 | static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, | |
3043 | struct ocfs2_lock_res *lockres) | |
3044 | { | |
3045 | mlog_entry_void(); | |
3046 | ||
3047 | assert_spin_locked(&lockres->l_lock); | |
3048 | ||
3049 | if (lockres->l_flags & OCFS2_LOCK_FREEING) { | |
3050 | /* Do not schedule a lock for downconvert when it's on | |
3051 | * the way to destruction - any nodes wanting access | |
3052 | * to the resource will get it soon. */ | |
3053 | mlog(0, "Lockres %s won't be scheduled: flags 0x%lx\n", | |
3054 | lockres->l_name, lockres->l_flags); | |
3055 | return; | |
3056 | } | |
3057 | ||
3058 | lockres_or_flags(lockres, OCFS2_LOCK_QUEUED); | |
3059 | ||
3060 | spin_lock(&osb->vote_task_lock); | |
3061 | if (list_empty(&lockres->l_blocked_list)) { | |
3062 | list_add_tail(&lockres->l_blocked_list, | |
3063 | &osb->blocked_lock_list); | |
3064 | osb->blocked_lock_count++; | |
3065 | } | |
3066 | spin_unlock(&osb->vote_task_lock); | |
3067 | ||
3068 | mlog_exit_void(); | |
3069 | } | |
3070 | ||
3071 | /* This aids in debugging situations where a bad LVB might be involved. */ | |
3072 | void ocfs2_dump_meta_lvb_info(u64 level, | |
3073 | const char *function, | |
3074 | unsigned int line, | |
3075 | struct ocfs2_lock_res *lockres) | |
3076 | { | |
3077 | struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; | |
3078 | ||
3079 | mlog(level, "LVB information for %s (called from %s:%u):\n", | |
3080 | lockres->l_name, function, line); | |
f9e2d82e MF |
3081 | mlog(level, "version: %u, clusters: %u, generation: 0x%x\n", |
3082 | lvb->lvb_version, be32_to_cpu(lvb->lvb_iclusters), | |
3083 | be32_to_cpu(lvb->lvb_igeneration)); | |
b0697053 MF |
3084 | mlog(level, "size: %llu, uid %u, gid %u, mode 0x%x\n", |
3085 | (unsigned long long)be64_to_cpu(lvb->lvb_isize), | |
3086 | be32_to_cpu(lvb->lvb_iuid), be32_to_cpu(lvb->lvb_igid), | |
3087 | be16_to_cpu(lvb->lvb_imode)); | |
3088 | mlog(level, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, " | |
ca4d147e | 3089 | "mtime_packed 0x%llx iattr 0x%x\n", be16_to_cpu(lvb->lvb_inlink), |
b0697053 MF |
3090 | (long long)be64_to_cpu(lvb->lvb_iatime_packed), |
3091 | (long long)be64_to_cpu(lvb->lvb_ictime_packed), | |
ca4d147e HP |
3092 | (long long)be64_to_cpu(lvb->lvb_imtime_packed), |
3093 | be32_to_cpu(lvb->lvb_iattr)); | |
ccd979bd | 3094 | } |