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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> | |
ccd979bd MF |
30 | #include <linux/crc32.h> |
31 | #include <linux/kthread.h> | |
32 | #include <linux/pagemap.h> | |
33 | #include <linux/debugfs.h> | |
34 | #include <linux/seq_file.h> | |
35 | ||
36 | #include <cluster/heartbeat.h> | |
37 | #include <cluster/nodemanager.h> | |
38 | #include <cluster/tcp.h> | |
39 | ||
40 | #include <dlm/dlmapi.h> | |
41 | ||
42 | #define MLOG_MASK_PREFIX ML_DLM_GLUE | |
43 | #include <cluster/masklog.h> | |
44 | ||
45 | #include "ocfs2.h" | |
46 | ||
47 | #include "alloc.h" | |
d680efe9 | 48 | #include "dcache.h" |
ccd979bd MF |
49 | #include "dlmglue.h" |
50 | #include "extent_map.h" | |
7f1a37e3 | 51 | #include "file.h" |
ccd979bd MF |
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" | |
ccd979bd MF |
58 | |
59 | #include "buffer_head_io.h" | |
60 | ||
61 | struct ocfs2_mask_waiter { | |
62 | struct list_head mw_item; | |
63 | int mw_status; | |
64 | struct completion mw_complete; | |
65 | unsigned long mw_mask; | |
66 | unsigned long mw_goal; | |
67 | }; | |
68 | ||
54a7e755 MF |
69 | static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres); |
70 | static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres); | |
ccd979bd | 71 | |
d680efe9 | 72 | /* |
cc567d89 | 73 | * Return value from ->downconvert_worker functions. |
d680efe9 | 74 | * |
b5e500e2 | 75 | * These control the precise actions of ocfs2_unblock_lock() |
d680efe9 MF |
76 | * and ocfs2_process_blocked_lock() |
77 | * | |
78 | */ | |
79 | enum ocfs2_unblock_action { | |
80 | UNBLOCK_CONTINUE = 0, /* Continue downconvert */ | |
81 | UNBLOCK_CONTINUE_POST = 1, /* Continue downconvert, fire | |
82 | * ->post_unlock callback */ | |
83 | UNBLOCK_STOP_POST = 2, /* Do not downconvert, fire | |
84 | * ->post_unlock() callback. */ | |
85 | }; | |
86 | ||
87 | struct ocfs2_unblock_ctl { | |
88 | int requeue; | |
89 | enum ocfs2_unblock_action unblock_action; | |
90 | }; | |
91 | ||
810d5aeb MF |
92 | static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres, |
93 | int new_level); | |
94 | static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres); | |
95 | ||
cc567d89 MF |
96 | static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, |
97 | int blocking); | |
98 | ||
cc567d89 MF |
99 | static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, |
100 | int blocking); | |
d680efe9 MF |
101 | |
102 | static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, | |
103 | struct ocfs2_lock_res *lockres); | |
ccd979bd | 104 | |
6cb129f5 AB |
105 | |
106 | #define mlog_meta_lvb(__level, __lockres) ocfs2_dump_meta_lvb_info(__level, __PRETTY_FUNCTION__, __LINE__, __lockres) | |
107 | ||
108 | /* This aids in debugging situations where a bad LVB might be involved. */ | |
109 | static void ocfs2_dump_meta_lvb_info(u64 level, | |
110 | const char *function, | |
111 | unsigned int line, | |
112 | struct ocfs2_lock_res *lockres) | |
113 | { | |
114 | struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; | |
115 | ||
116 | mlog(level, "LVB information for %s (called from %s:%u):\n", | |
117 | lockres->l_name, function, line); | |
118 | mlog(level, "version: %u, clusters: %u, generation: 0x%x\n", | |
119 | lvb->lvb_version, be32_to_cpu(lvb->lvb_iclusters), | |
120 | be32_to_cpu(lvb->lvb_igeneration)); | |
121 | mlog(level, "size: %llu, uid %u, gid %u, mode 0x%x\n", | |
122 | (unsigned long long)be64_to_cpu(lvb->lvb_isize), | |
123 | be32_to_cpu(lvb->lvb_iuid), be32_to_cpu(lvb->lvb_igid), | |
124 | be16_to_cpu(lvb->lvb_imode)); | |
125 | mlog(level, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, " | |
126 | "mtime_packed 0x%llx iattr 0x%x\n", be16_to_cpu(lvb->lvb_inlink), | |
127 | (long long)be64_to_cpu(lvb->lvb_iatime_packed), | |
128 | (long long)be64_to_cpu(lvb->lvb_ictime_packed), | |
129 | (long long)be64_to_cpu(lvb->lvb_imtime_packed), | |
130 | be32_to_cpu(lvb->lvb_iattr)); | |
131 | } | |
132 | ||
133 | ||
f625c979 MF |
134 | /* |
135 | * OCFS2 Lock Resource Operations | |
136 | * | |
137 | * These fine tune the behavior of the generic dlmglue locking infrastructure. | |
0d5dc6c2 MF |
138 | * |
139 | * The most basic of lock types can point ->l_priv to their respective | |
140 | * struct ocfs2_super and allow the default actions to manage things. | |
141 | * | |
142 | * Right now, each lock type also needs to implement an init function, | |
143 | * and trivial lock/unlock wrappers. ocfs2_simple_drop_lockres() | |
144 | * should be called when the lock is no longer needed (i.e., object | |
145 | * destruction time). | |
f625c979 | 146 | */ |
ccd979bd | 147 | struct ocfs2_lock_res_ops { |
54a7e755 MF |
148 | /* |
149 | * Translate an ocfs2_lock_res * into an ocfs2_super *. Define | |
150 | * this callback if ->l_priv is not an ocfs2_super pointer | |
151 | */ | |
152 | struct ocfs2_super * (*get_osb)(struct ocfs2_lock_res *); | |
b5e500e2 | 153 | |
0d5dc6c2 | 154 | /* |
34d024f8 MF |
155 | * Optionally called in the downconvert thread after a |
156 | * successful downconvert. The lockres will not be referenced | |
157 | * after this callback is called, so it is safe to free | |
158 | * memory, etc. | |
0d5dc6c2 MF |
159 | * |
160 | * The exact semantics of when this is called are controlled | |
161 | * by ->downconvert_worker() | |
162 | */ | |
d680efe9 | 163 | void (*post_unlock)(struct ocfs2_super *, struct ocfs2_lock_res *); |
f625c979 | 164 | |
16d5b956 MF |
165 | /* |
166 | * Allow a lock type to add checks to determine whether it is | |
167 | * safe to downconvert a lock. Return 0 to re-queue the | |
168 | * downconvert at a later time, nonzero to continue. | |
169 | * | |
170 | * For most locks, the default checks that there are no | |
171 | * incompatible holders are sufficient. | |
172 | * | |
173 | * Called with the lockres spinlock held. | |
174 | */ | |
175 | int (*check_downconvert)(struct ocfs2_lock_res *, int); | |
176 | ||
5ef0d4ea MF |
177 | /* |
178 | * Allows a lock type to populate the lock value block. This | |
179 | * is called on downconvert, and when we drop a lock. | |
180 | * | |
181 | * Locks that want to use this should set LOCK_TYPE_USES_LVB | |
182 | * in the flags field. | |
183 | * | |
184 | * Called with the lockres spinlock held. | |
185 | */ | |
186 | void (*set_lvb)(struct ocfs2_lock_res *); | |
187 | ||
cc567d89 MF |
188 | /* |
189 | * Called from the downconvert thread when it is determined | |
190 | * that a lock will be downconverted. This is called without | |
191 | * any locks held so the function can do work that might | |
192 | * schedule (syncing out data, etc). | |
193 | * | |
194 | * This should return any one of the ocfs2_unblock_action | |
195 | * values, depending on what it wants the thread to do. | |
196 | */ | |
197 | int (*downconvert_worker)(struct ocfs2_lock_res *, int); | |
198 | ||
f625c979 MF |
199 | /* |
200 | * LOCK_TYPE_* flags which describe the specific requirements | |
201 | * of a lock type. Descriptions of each individual flag follow. | |
202 | */ | |
203 | int flags; | |
ccd979bd MF |
204 | }; |
205 | ||
f625c979 MF |
206 | /* |
207 | * Some locks want to "refresh" potentially stale data when a | |
208 | * meaningful (PRMODE or EXMODE) lock level is first obtained. If this | |
209 | * flag is set, the OCFS2_LOCK_NEEDS_REFRESH flag will be set on the | |
210 | * individual lockres l_flags member from the ast function. It is | |
211 | * expected that the locking wrapper will clear the | |
212 | * OCFS2_LOCK_NEEDS_REFRESH flag when done. | |
213 | */ | |
214 | #define LOCK_TYPE_REQUIRES_REFRESH 0x1 | |
215 | ||
b80fc012 | 216 | /* |
5ef0d4ea MF |
217 | * Indicate that a lock type makes use of the lock value block. The |
218 | * ->set_lvb lock type callback must be defined. | |
b80fc012 MF |
219 | */ |
220 | #define LOCK_TYPE_USES_LVB 0x2 | |
221 | ||
ccd979bd | 222 | static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = { |
54a7e755 | 223 | .get_osb = ocfs2_get_inode_osb, |
f625c979 | 224 | .flags = 0, |
ccd979bd MF |
225 | }; |
226 | ||
e63aecb6 | 227 | static struct ocfs2_lock_res_ops ocfs2_inode_inode_lops = { |
54a7e755 | 228 | .get_osb = ocfs2_get_inode_osb, |
810d5aeb MF |
229 | .check_downconvert = ocfs2_check_meta_downconvert, |
230 | .set_lvb = ocfs2_set_meta_lvb, | |
f1f54068 | 231 | .downconvert_worker = ocfs2_data_convert_worker, |
b80fc012 | 232 | .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB, |
ccd979bd MF |
233 | }; |
234 | ||
ccd979bd | 235 | static struct ocfs2_lock_res_ops ocfs2_super_lops = { |
f625c979 | 236 | .flags = LOCK_TYPE_REQUIRES_REFRESH, |
ccd979bd MF |
237 | }; |
238 | ||
239 | static struct ocfs2_lock_res_ops ocfs2_rename_lops = { | |
f625c979 | 240 | .flags = 0, |
ccd979bd MF |
241 | }; |
242 | ||
d680efe9 | 243 | static struct ocfs2_lock_res_ops ocfs2_dentry_lops = { |
54a7e755 | 244 | .get_osb = ocfs2_get_dentry_osb, |
d680efe9 | 245 | .post_unlock = ocfs2_dentry_post_unlock, |
cc567d89 | 246 | .downconvert_worker = ocfs2_dentry_convert_worker, |
f625c979 | 247 | .flags = 0, |
d680efe9 MF |
248 | }; |
249 | ||
50008630 TY |
250 | static struct ocfs2_lock_res_ops ocfs2_inode_open_lops = { |
251 | .get_osb = ocfs2_get_inode_osb, | |
252 | .flags = 0, | |
253 | }; | |
254 | ||
ccd979bd MF |
255 | static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres) |
256 | { | |
257 | return lockres->l_type == OCFS2_LOCK_TYPE_META || | |
50008630 TY |
258 | lockres->l_type == OCFS2_LOCK_TYPE_RW || |
259 | lockres->l_type == OCFS2_LOCK_TYPE_OPEN; | |
ccd979bd MF |
260 | } |
261 | ||
ccd979bd MF |
262 | static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres) |
263 | { | |
264 | BUG_ON(!ocfs2_is_inode_lock(lockres)); | |
265 | ||
266 | return (struct inode *) lockres->l_priv; | |
267 | } | |
268 | ||
d680efe9 MF |
269 | static inline struct ocfs2_dentry_lock *ocfs2_lock_res_dl(struct ocfs2_lock_res *lockres) |
270 | { | |
271 | BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_DENTRY); | |
272 | ||
273 | return (struct ocfs2_dentry_lock *)lockres->l_priv; | |
274 | } | |
275 | ||
54a7e755 MF |
276 | static inline struct ocfs2_super *ocfs2_get_lockres_osb(struct ocfs2_lock_res *lockres) |
277 | { | |
278 | if (lockres->l_ops->get_osb) | |
279 | return lockres->l_ops->get_osb(lockres); | |
280 | ||
281 | return (struct ocfs2_super *)lockres->l_priv; | |
282 | } | |
283 | ||
ccd979bd MF |
284 | static int ocfs2_lock_create(struct ocfs2_super *osb, |
285 | struct ocfs2_lock_res *lockres, | |
286 | int level, | |
287 | int dlm_flags); | |
288 | static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, | |
289 | int wanted); | |
290 | static void ocfs2_cluster_unlock(struct ocfs2_super *osb, | |
291 | struct ocfs2_lock_res *lockres, | |
292 | int level); | |
293 | static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres); | |
294 | static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres); | |
295 | static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres); | |
296 | static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, int level); | |
297 | static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, | |
298 | struct ocfs2_lock_res *lockres); | |
299 | static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, | |
300 | int convert); | |
301 | #define ocfs2_log_dlm_error(_func, _stat, _lockres) do { \ | |
302 | mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \ | |
303 | "resource %s: %s\n", dlm_errname(_stat), _func, \ | |
304 | _lockres->l_name, dlm_errmsg(_stat)); \ | |
305 | } while (0) | |
34d024f8 MF |
306 | static int ocfs2_downconvert_thread(void *arg); |
307 | static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb, | |
308 | struct ocfs2_lock_res *lockres); | |
e63aecb6 | 309 | static int ocfs2_inode_lock_update(struct inode *inode, |
ccd979bd MF |
310 | struct buffer_head **bh); |
311 | static void ocfs2_drop_osb_locks(struct ocfs2_super *osb); | |
312 | static inline int ocfs2_highest_compat_lock_level(int level); | |
ccd979bd | 313 | |
ccd979bd MF |
314 | static void ocfs2_build_lock_name(enum ocfs2_lock_type type, |
315 | u64 blkno, | |
316 | u32 generation, | |
317 | char *name) | |
318 | { | |
319 | int len; | |
320 | ||
321 | mlog_entry_void(); | |
322 | ||
323 | BUG_ON(type >= OCFS2_NUM_LOCK_TYPES); | |
324 | ||
b0697053 MF |
325 | len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016llx%08x", |
326 | ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD, | |
327 | (long long)blkno, generation); | |
ccd979bd MF |
328 | |
329 | BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1)); | |
330 | ||
331 | mlog(0, "built lock resource with name: %s\n", name); | |
332 | ||
333 | mlog_exit_void(); | |
334 | } | |
335 | ||
34af946a | 336 | static DEFINE_SPINLOCK(ocfs2_dlm_tracking_lock); |
ccd979bd MF |
337 | |
338 | static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res, | |
339 | struct ocfs2_dlm_debug *dlm_debug) | |
340 | { | |
341 | mlog(0, "Add tracking for lockres %s\n", res->l_name); | |
342 | ||
343 | spin_lock(&ocfs2_dlm_tracking_lock); | |
344 | list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking); | |
345 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
346 | } | |
347 | ||
348 | static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res) | |
349 | { | |
350 | spin_lock(&ocfs2_dlm_tracking_lock); | |
351 | if (!list_empty(&res->l_debug_list)) | |
352 | list_del_init(&res->l_debug_list); | |
353 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
354 | } | |
355 | ||
356 | static void ocfs2_lock_res_init_common(struct ocfs2_super *osb, | |
357 | struct ocfs2_lock_res *res, | |
358 | enum ocfs2_lock_type type, | |
ccd979bd MF |
359 | struct ocfs2_lock_res_ops *ops, |
360 | void *priv) | |
361 | { | |
ccd979bd MF |
362 | res->l_type = type; |
363 | res->l_ops = ops; | |
364 | res->l_priv = priv; | |
365 | ||
366 | res->l_level = LKM_IVMODE; | |
367 | res->l_requested = LKM_IVMODE; | |
368 | res->l_blocking = LKM_IVMODE; | |
369 | res->l_action = OCFS2_AST_INVALID; | |
370 | res->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
371 | ||
372 | res->l_flags = OCFS2_LOCK_INITIALIZED; | |
373 | ||
374 | ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug); | |
375 | } | |
376 | ||
377 | void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res) | |
378 | { | |
379 | /* This also clears out the lock status block */ | |
380 | memset(res, 0, sizeof(struct ocfs2_lock_res)); | |
381 | spin_lock_init(&res->l_lock); | |
382 | init_waitqueue_head(&res->l_event); | |
383 | INIT_LIST_HEAD(&res->l_blocked_list); | |
384 | INIT_LIST_HEAD(&res->l_mask_waiters); | |
385 | } | |
386 | ||
387 | void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res, | |
388 | enum ocfs2_lock_type type, | |
24c19ef4 | 389 | unsigned int generation, |
ccd979bd MF |
390 | struct inode *inode) |
391 | { | |
392 | struct ocfs2_lock_res_ops *ops; | |
393 | ||
394 | switch(type) { | |
395 | case OCFS2_LOCK_TYPE_RW: | |
396 | ops = &ocfs2_inode_rw_lops; | |
397 | break; | |
398 | case OCFS2_LOCK_TYPE_META: | |
e63aecb6 | 399 | ops = &ocfs2_inode_inode_lops; |
ccd979bd | 400 | break; |
50008630 TY |
401 | case OCFS2_LOCK_TYPE_OPEN: |
402 | ops = &ocfs2_inode_open_lops; | |
403 | break; | |
ccd979bd MF |
404 | default: |
405 | mlog_bug_on_msg(1, "type: %d\n", type); | |
406 | ops = NULL; /* thanks, gcc */ | |
407 | break; | |
408 | }; | |
409 | ||
d680efe9 | 410 | ocfs2_build_lock_name(type, OCFS2_I(inode)->ip_blkno, |
24c19ef4 | 411 | generation, res->l_name); |
d680efe9 MF |
412 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type, ops, inode); |
413 | } | |
414 | ||
54a7e755 MF |
415 | static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres) |
416 | { | |
417 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
418 | ||
419 | return OCFS2_SB(inode->i_sb); | |
420 | } | |
421 | ||
d680efe9 MF |
422 | static __u64 ocfs2_get_dentry_lock_ino(struct ocfs2_lock_res *lockres) |
423 | { | |
424 | __be64 inode_blkno_be; | |
425 | ||
426 | memcpy(&inode_blkno_be, &lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], | |
427 | sizeof(__be64)); | |
428 | ||
429 | return be64_to_cpu(inode_blkno_be); | |
430 | } | |
431 | ||
54a7e755 MF |
432 | static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres) |
433 | { | |
434 | struct ocfs2_dentry_lock *dl = lockres->l_priv; | |
435 | ||
436 | return OCFS2_SB(dl->dl_inode->i_sb); | |
437 | } | |
438 | ||
d680efe9 MF |
439 | void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl, |
440 | u64 parent, struct inode *inode) | |
441 | { | |
442 | int len; | |
443 | u64 inode_blkno = OCFS2_I(inode)->ip_blkno; | |
444 | __be64 inode_blkno_be = cpu_to_be64(inode_blkno); | |
445 | struct ocfs2_lock_res *lockres = &dl->dl_lockres; | |
446 | ||
447 | ocfs2_lock_res_init_once(lockres); | |
448 | ||
449 | /* | |
450 | * Unfortunately, the standard lock naming scheme won't work | |
451 | * here because we have two 16 byte values to use. Instead, | |
452 | * we'll stuff the inode number as a binary value. We still | |
453 | * want error prints to show something without garbling the | |
454 | * display, so drop a null byte in there before the inode | |
455 | * number. A future version of OCFS2 will likely use all | |
456 | * binary lock names. The stringified names have been a | |
457 | * tremendous aid in debugging, but now that the debugfs | |
458 | * interface exists, we can mangle things there if need be. | |
459 | * | |
460 | * NOTE: We also drop the standard "pad" value (the total lock | |
461 | * name size stays the same though - the last part is all | |
462 | * zeros due to the memset in ocfs2_lock_res_init_once() | |
463 | */ | |
464 | len = snprintf(lockres->l_name, OCFS2_DENTRY_LOCK_INO_START, | |
465 | "%c%016llx", | |
466 | ocfs2_lock_type_char(OCFS2_LOCK_TYPE_DENTRY), | |
467 | (long long)parent); | |
468 | ||
469 | BUG_ON(len != (OCFS2_DENTRY_LOCK_INO_START - 1)); | |
470 | ||
471 | memcpy(&lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], &inode_blkno_be, | |
472 | sizeof(__be64)); | |
473 | ||
474 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres, | |
475 | OCFS2_LOCK_TYPE_DENTRY, &ocfs2_dentry_lops, | |
476 | dl); | |
ccd979bd MF |
477 | } |
478 | ||
479 | static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res, | |
480 | struct ocfs2_super *osb) | |
481 | { | |
482 | /* Superblock lockres doesn't come from a slab so we call init | |
483 | * once on it manually. */ | |
484 | ocfs2_lock_res_init_once(res); | |
d680efe9 MF |
485 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_SUPER, OCFS2_SUPER_BLOCK_BLKNO, |
486 | 0, res->l_name); | |
ccd979bd | 487 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER, |
ccd979bd MF |
488 | &ocfs2_super_lops, osb); |
489 | } | |
490 | ||
491 | static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res, | |
492 | struct ocfs2_super *osb) | |
493 | { | |
494 | /* Rename lockres doesn't come from a slab so we call init | |
495 | * once on it manually. */ | |
496 | ocfs2_lock_res_init_once(res); | |
d680efe9 MF |
497 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_RENAME, 0, 0, res->l_name); |
498 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME, | |
ccd979bd MF |
499 | &ocfs2_rename_lops, osb); |
500 | } | |
501 | ||
502 | void ocfs2_lock_res_free(struct ocfs2_lock_res *res) | |
503 | { | |
504 | mlog_entry_void(); | |
505 | ||
506 | if (!(res->l_flags & OCFS2_LOCK_INITIALIZED)) | |
507 | return; | |
508 | ||
509 | ocfs2_remove_lockres_tracking(res); | |
510 | ||
511 | mlog_bug_on_msg(!list_empty(&res->l_blocked_list), | |
512 | "Lockres %s is on the blocked list\n", | |
513 | res->l_name); | |
514 | mlog_bug_on_msg(!list_empty(&res->l_mask_waiters), | |
515 | "Lockres %s has mask waiters pending\n", | |
516 | res->l_name); | |
517 | mlog_bug_on_msg(spin_is_locked(&res->l_lock), | |
518 | "Lockres %s is locked\n", | |
519 | res->l_name); | |
520 | mlog_bug_on_msg(res->l_ro_holders, | |
521 | "Lockres %s has %u ro holders\n", | |
522 | res->l_name, res->l_ro_holders); | |
523 | mlog_bug_on_msg(res->l_ex_holders, | |
524 | "Lockres %s has %u ex holders\n", | |
525 | res->l_name, res->l_ex_holders); | |
526 | ||
527 | /* Need to clear out the lock status block for the dlm */ | |
528 | memset(&res->l_lksb, 0, sizeof(res->l_lksb)); | |
529 | ||
530 | res->l_flags = 0UL; | |
531 | mlog_exit_void(); | |
532 | } | |
533 | ||
534 | static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres, | |
535 | int level) | |
536 | { | |
537 | mlog_entry_void(); | |
538 | ||
539 | BUG_ON(!lockres); | |
540 | ||
541 | switch(level) { | |
542 | case LKM_EXMODE: | |
543 | lockres->l_ex_holders++; | |
544 | break; | |
545 | case LKM_PRMODE: | |
546 | lockres->l_ro_holders++; | |
547 | break; | |
548 | default: | |
549 | BUG(); | |
550 | } | |
551 | ||
552 | mlog_exit_void(); | |
553 | } | |
554 | ||
555 | static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres, | |
556 | int level) | |
557 | { | |
558 | mlog_entry_void(); | |
559 | ||
560 | BUG_ON(!lockres); | |
561 | ||
562 | switch(level) { | |
563 | case LKM_EXMODE: | |
564 | BUG_ON(!lockres->l_ex_holders); | |
565 | lockres->l_ex_holders--; | |
566 | break; | |
567 | case LKM_PRMODE: | |
568 | BUG_ON(!lockres->l_ro_holders); | |
569 | lockres->l_ro_holders--; | |
570 | break; | |
571 | default: | |
572 | BUG(); | |
573 | } | |
574 | mlog_exit_void(); | |
575 | } | |
576 | ||
577 | /* WARNING: This function lives in a world where the only three lock | |
578 | * levels are EX, PR, and NL. It *will* have to be adjusted when more | |
579 | * lock types are added. */ | |
580 | static inline int ocfs2_highest_compat_lock_level(int level) | |
581 | { | |
582 | int new_level = LKM_EXMODE; | |
583 | ||
584 | if (level == LKM_EXMODE) | |
585 | new_level = LKM_NLMODE; | |
586 | else if (level == LKM_PRMODE) | |
587 | new_level = LKM_PRMODE; | |
588 | return new_level; | |
589 | } | |
590 | ||
591 | static void lockres_set_flags(struct ocfs2_lock_res *lockres, | |
592 | unsigned long newflags) | |
593 | { | |
800deef3 | 594 | struct ocfs2_mask_waiter *mw, *tmp; |
ccd979bd MF |
595 | |
596 | assert_spin_locked(&lockres->l_lock); | |
597 | ||
598 | lockres->l_flags = newflags; | |
599 | ||
800deef3 | 600 | list_for_each_entry_safe(mw, tmp, &lockres->l_mask_waiters, mw_item) { |
ccd979bd MF |
601 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) |
602 | continue; | |
603 | ||
604 | list_del_init(&mw->mw_item); | |
605 | mw->mw_status = 0; | |
606 | complete(&mw->mw_complete); | |
607 | } | |
608 | } | |
609 | static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or) | |
610 | { | |
611 | lockres_set_flags(lockres, lockres->l_flags | or); | |
612 | } | |
613 | static void lockres_clear_flags(struct ocfs2_lock_res *lockres, | |
614 | unsigned long clear) | |
615 | { | |
616 | lockres_set_flags(lockres, lockres->l_flags & ~clear); | |
617 | } | |
618 | ||
619 | static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres) | |
620 | { | |
621 | mlog_entry_void(); | |
622 | ||
623 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); | |
624 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); | |
625 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
626 | BUG_ON(lockres->l_blocking <= LKM_NLMODE); | |
627 | ||
628 | lockres->l_level = lockres->l_requested; | |
629 | if (lockres->l_level <= | |
630 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) { | |
631 | lockres->l_blocking = LKM_NLMODE; | |
632 | lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED); | |
633 | } | |
634 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
635 | ||
636 | mlog_exit_void(); | |
637 | } | |
638 | ||
639 | static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres) | |
640 | { | |
641 | mlog_entry_void(); | |
642 | ||
643 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); | |
644 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); | |
645 | ||
646 | /* Convert from RO to EX doesn't really need anything as our | |
647 | * information is already up to data. Convert from NL to | |
648 | * *anything* however should mark ourselves as needing an | |
649 | * update */ | |
f625c979 MF |
650 | if (lockres->l_level == LKM_NLMODE && |
651 | lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) | |
ccd979bd MF |
652 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
653 | ||
654 | lockres->l_level = lockres->l_requested; | |
655 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
656 | ||
657 | mlog_exit_void(); | |
658 | } | |
659 | ||
660 | static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres) | |
661 | { | |
662 | mlog_entry_void(); | |
663 | ||
3cf0c507 | 664 | BUG_ON((!(lockres->l_flags & OCFS2_LOCK_BUSY))); |
ccd979bd MF |
665 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); |
666 | ||
667 | if (lockres->l_requested > LKM_NLMODE && | |
f625c979 MF |
668 | !(lockres->l_flags & OCFS2_LOCK_LOCAL) && |
669 | lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) | |
ccd979bd MF |
670 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
671 | ||
672 | lockres->l_level = lockres->l_requested; | |
673 | lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED); | |
674 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
675 | ||
676 | mlog_exit_void(); | |
677 | } | |
678 | ||
ccd979bd MF |
679 | static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, |
680 | int level) | |
681 | { | |
682 | int needs_downconvert = 0; | |
683 | mlog_entry_void(); | |
684 | ||
685 | assert_spin_locked(&lockres->l_lock); | |
686 | ||
687 | lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); | |
688 | ||
689 | if (level > lockres->l_blocking) { | |
690 | /* only schedule a downconvert if we haven't already scheduled | |
691 | * one that goes low enough to satisfy the level we're | |
692 | * blocking. this also catches the case where we get | |
693 | * duplicate BASTs */ | |
694 | if (ocfs2_highest_compat_lock_level(level) < | |
695 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) | |
696 | needs_downconvert = 1; | |
697 | ||
698 | lockres->l_blocking = level; | |
699 | } | |
700 | ||
701 | mlog_exit(needs_downconvert); | |
702 | return needs_downconvert; | |
703 | } | |
704 | ||
aa2623ad | 705 | static void ocfs2_blocking_ast(void *opaque, int level) |
ccd979bd | 706 | { |
aa2623ad MF |
707 | struct ocfs2_lock_res *lockres = opaque; |
708 | struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); | |
ccd979bd MF |
709 | int needs_downconvert; |
710 | unsigned long flags; | |
711 | ||
ccd979bd MF |
712 | BUG_ON(level <= LKM_NLMODE); |
713 | ||
aa2623ad MF |
714 | mlog(0, "BAST fired for lockres %s, blocking %d, level %d type %s\n", |
715 | lockres->l_name, level, lockres->l_level, | |
716 | ocfs2_lock_type_string(lockres->l_type)); | |
717 | ||
ccd979bd MF |
718 | spin_lock_irqsave(&lockres->l_lock, flags); |
719 | needs_downconvert = ocfs2_generic_handle_bast(lockres, level); | |
720 | if (needs_downconvert) | |
721 | ocfs2_schedule_blocked_lock(osb, lockres); | |
722 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
723 | ||
d680efe9 MF |
724 | wake_up(&lockres->l_event); |
725 | ||
34d024f8 | 726 | ocfs2_wake_downconvert_thread(osb); |
ccd979bd MF |
727 | } |
728 | ||
e92d57df | 729 | static void ocfs2_locking_ast(void *opaque) |
ccd979bd | 730 | { |
e92d57df | 731 | struct ocfs2_lock_res *lockres = opaque; |
ccd979bd MF |
732 | struct dlm_lockstatus *lksb = &lockres->l_lksb; |
733 | unsigned long flags; | |
734 | ||
735 | spin_lock_irqsave(&lockres->l_lock, flags); | |
736 | ||
737 | if (lksb->status != DLM_NORMAL) { | |
738 | mlog(ML_ERROR, "lockres %s: lksb status value of %u!\n", | |
739 | lockres->l_name, lksb->status); | |
740 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
741 | return; | |
742 | } | |
743 | ||
744 | switch(lockres->l_action) { | |
745 | case OCFS2_AST_ATTACH: | |
746 | ocfs2_generic_handle_attach_action(lockres); | |
e92d57df | 747 | lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL); |
ccd979bd MF |
748 | break; |
749 | case OCFS2_AST_CONVERT: | |
750 | ocfs2_generic_handle_convert_action(lockres); | |
751 | break; | |
752 | case OCFS2_AST_DOWNCONVERT: | |
753 | ocfs2_generic_handle_downconvert_action(lockres); | |
754 | break; | |
755 | default: | |
e92d57df MF |
756 | mlog(ML_ERROR, "lockres %s: ast fired with invalid action: %u " |
757 | "lockres flags = 0x%lx, unlock action: %u\n", | |
758 | lockres->l_name, lockres->l_action, lockres->l_flags, | |
759 | lockres->l_unlock_action); | |
ccd979bd MF |
760 | BUG(); |
761 | } | |
762 | ||
ccd979bd MF |
763 | /* set it to something invalid so if we get called again we |
764 | * can catch it. */ | |
765 | lockres->l_action = OCFS2_AST_INVALID; | |
ccd979bd MF |
766 | |
767 | wake_up(&lockres->l_event); | |
d680efe9 | 768 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
ccd979bd MF |
769 | } |
770 | ||
ccd979bd MF |
771 | static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, |
772 | int convert) | |
773 | { | |
774 | unsigned long flags; | |
775 | ||
776 | mlog_entry_void(); | |
777 | spin_lock_irqsave(&lockres->l_lock, flags); | |
778 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
779 | if (convert) | |
780 | lockres->l_action = OCFS2_AST_INVALID; | |
781 | else | |
782 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
783 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
784 | ||
785 | wake_up(&lockres->l_event); | |
786 | mlog_exit_void(); | |
787 | } | |
788 | ||
789 | /* Note: If we detect another process working on the lock (i.e., | |
790 | * OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller | |
791 | * to do the right thing in that case. | |
792 | */ | |
793 | static int ocfs2_lock_create(struct ocfs2_super *osb, | |
794 | struct ocfs2_lock_res *lockres, | |
795 | int level, | |
796 | int dlm_flags) | |
797 | { | |
798 | int ret = 0; | |
c271c5c2 | 799 | enum dlm_status status = DLM_NORMAL; |
ccd979bd MF |
800 | unsigned long flags; |
801 | ||
802 | mlog_entry_void(); | |
803 | ||
804 | mlog(0, "lock %s, level = %d, flags = %d\n", lockres->l_name, level, | |
805 | dlm_flags); | |
806 | ||
807 | spin_lock_irqsave(&lockres->l_lock, flags); | |
808 | if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) || | |
809 | (lockres->l_flags & OCFS2_LOCK_BUSY)) { | |
810 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
811 | goto bail; | |
812 | } | |
813 | ||
814 | lockres->l_action = OCFS2_AST_ATTACH; | |
815 | lockres->l_requested = level; | |
816 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
817 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
818 | ||
819 | status = dlmlock(osb->dlm, | |
820 | level, | |
821 | &lockres->l_lksb, | |
822 | dlm_flags, | |
823 | lockres->l_name, | |
f0681062 | 824 | OCFS2_LOCK_ID_MAX_LEN - 1, |
e92d57df | 825 | ocfs2_locking_ast, |
ccd979bd | 826 | lockres, |
aa2623ad | 827 | ocfs2_blocking_ast); |
ccd979bd MF |
828 | if (status != DLM_NORMAL) { |
829 | ocfs2_log_dlm_error("dlmlock", status, lockres); | |
830 | ret = -EINVAL; | |
831 | ocfs2_recover_from_dlm_error(lockres, 1); | |
832 | } | |
833 | ||
834 | mlog(0, "lock %s, successfull return from dlmlock\n", lockres->l_name); | |
835 | ||
836 | bail: | |
837 | mlog_exit(ret); | |
838 | return ret; | |
839 | } | |
840 | ||
841 | static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres, | |
842 | int flag) | |
843 | { | |
844 | unsigned long flags; | |
845 | int ret; | |
846 | ||
847 | spin_lock_irqsave(&lockres->l_lock, flags); | |
848 | ret = lockres->l_flags & flag; | |
849 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
850 | ||
851 | return ret; | |
852 | } | |
853 | ||
854 | static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres) | |
855 | ||
856 | { | |
857 | wait_event(lockres->l_event, | |
858 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY)); | |
859 | } | |
860 | ||
861 | static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres) | |
862 | ||
863 | { | |
864 | wait_event(lockres->l_event, | |
865 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING)); | |
866 | } | |
867 | ||
868 | /* predict what lock level we'll be dropping down to on behalf | |
869 | * of another node, and return true if the currently wanted | |
870 | * level will be compatible with it. */ | |
871 | static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, | |
872 | int wanted) | |
873 | { | |
874 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
875 | ||
876 | return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking); | |
877 | } | |
878 | ||
879 | static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw) | |
880 | { | |
881 | INIT_LIST_HEAD(&mw->mw_item); | |
882 | init_completion(&mw->mw_complete); | |
883 | } | |
884 | ||
885 | static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw) | |
886 | { | |
887 | wait_for_completion(&mw->mw_complete); | |
888 | /* Re-arm the completion in case we want to wait on it again */ | |
889 | INIT_COMPLETION(mw->mw_complete); | |
890 | return mw->mw_status; | |
891 | } | |
892 | ||
893 | static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres, | |
894 | struct ocfs2_mask_waiter *mw, | |
895 | unsigned long mask, | |
896 | unsigned long goal) | |
897 | { | |
898 | BUG_ON(!list_empty(&mw->mw_item)); | |
899 | ||
900 | assert_spin_locked(&lockres->l_lock); | |
901 | ||
902 | list_add_tail(&mw->mw_item, &lockres->l_mask_waiters); | |
903 | mw->mw_mask = mask; | |
904 | mw->mw_goal = goal; | |
905 | } | |
906 | ||
907 | /* returns 0 if the mw that was removed was already satisfied, -EBUSY | |
908 | * if the mask still hadn't reached its goal */ | |
909 | static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres, | |
910 | struct ocfs2_mask_waiter *mw) | |
911 | { | |
912 | unsigned long flags; | |
913 | int ret = 0; | |
914 | ||
915 | spin_lock_irqsave(&lockres->l_lock, flags); | |
916 | if (!list_empty(&mw->mw_item)) { | |
917 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) | |
918 | ret = -EBUSY; | |
919 | ||
920 | list_del_init(&mw->mw_item); | |
921 | init_completion(&mw->mw_complete); | |
922 | } | |
923 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
924 | ||
925 | return ret; | |
926 | ||
927 | } | |
928 | ||
929 | static int ocfs2_cluster_lock(struct ocfs2_super *osb, | |
930 | struct ocfs2_lock_res *lockres, | |
931 | int level, | |
932 | int lkm_flags, | |
933 | int arg_flags) | |
934 | { | |
935 | struct ocfs2_mask_waiter mw; | |
936 | enum dlm_status status; | |
937 | int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR); | |
938 | int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */ | |
939 | unsigned long flags; | |
940 | ||
941 | mlog_entry_void(); | |
942 | ||
943 | ocfs2_init_mask_waiter(&mw); | |
944 | ||
b80fc012 MF |
945 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
946 | lkm_flags |= LKM_VALBLK; | |
947 | ||
ccd979bd MF |
948 | again: |
949 | wait = 0; | |
950 | ||
951 | if (catch_signals && signal_pending(current)) { | |
952 | ret = -ERESTARTSYS; | |
953 | goto out; | |
954 | } | |
955 | ||
956 | spin_lock_irqsave(&lockres->l_lock, flags); | |
957 | ||
958 | mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING, | |
959 | "Cluster lock called on freeing lockres %s! flags " | |
960 | "0x%lx\n", lockres->l_name, lockres->l_flags); | |
961 | ||
962 | /* We only compare against the currently granted level | |
963 | * here. If the lock is blocked waiting on a downconvert, | |
964 | * we'll get caught below. */ | |
965 | if (lockres->l_flags & OCFS2_LOCK_BUSY && | |
966 | level > lockres->l_level) { | |
967 | /* is someone sitting in dlm_lock? If so, wait on | |
968 | * them. */ | |
969 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
970 | wait = 1; | |
971 | goto unlock; | |
972 | } | |
973 | ||
ccd979bd MF |
974 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED && |
975 | !ocfs2_may_continue_on_blocked_lock(lockres, level)) { | |
976 | /* is the lock is currently blocked on behalf of | |
977 | * another node */ | |
978 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0); | |
979 | wait = 1; | |
980 | goto unlock; | |
981 | } | |
982 | ||
983 | if (level > lockres->l_level) { | |
984 | if (lockres->l_action != OCFS2_AST_INVALID) | |
985 | mlog(ML_ERROR, "lockres %s has action %u pending\n", | |
986 | lockres->l_name, lockres->l_action); | |
987 | ||
019d1b22 MF |
988 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { |
989 | lockres->l_action = OCFS2_AST_ATTACH; | |
990 | lkm_flags &= ~LKM_CONVERT; | |
991 | } else { | |
992 | lockres->l_action = OCFS2_AST_CONVERT; | |
993 | lkm_flags |= LKM_CONVERT; | |
994 | } | |
995 | ||
ccd979bd MF |
996 | lockres->l_requested = level; |
997 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
998 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
999 | ||
1000 | BUG_ON(level == LKM_IVMODE); | |
1001 | BUG_ON(level == LKM_NLMODE); | |
1002 | ||
1003 | mlog(0, "lock %s, convert from %d to level = %d\n", | |
1004 | lockres->l_name, lockres->l_level, level); | |
1005 | ||
1006 | /* call dlm_lock to upgrade lock now */ | |
1007 | status = dlmlock(osb->dlm, | |
1008 | level, | |
1009 | &lockres->l_lksb, | |
019d1b22 | 1010 | lkm_flags, |
ccd979bd | 1011 | lockres->l_name, |
f0681062 | 1012 | OCFS2_LOCK_ID_MAX_LEN - 1, |
e92d57df | 1013 | ocfs2_locking_ast, |
ccd979bd | 1014 | lockres, |
aa2623ad | 1015 | ocfs2_blocking_ast); |
ccd979bd MF |
1016 | if (status != DLM_NORMAL) { |
1017 | if ((lkm_flags & LKM_NOQUEUE) && | |
1018 | (status == DLM_NOTQUEUED)) | |
1019 | ret = -EAGAIN; | |
1020 | else { | |
1021 | ocfs2_log_dlm_error("dlmlock", status, | |
1022 | lockres); | |
1023 | ret = -EINVAL; | |
1024 | } | |
1025 | ocfs2_recover_from_dlm_error(lockres, 1); | |
1026 | goto out; | |
1027 | } | |
1028 | ||
1029 | mlog(0, "lock %s, successfull return from dlmlock\n", | |
1030 | lockres->l_name); | |
1031 | ||
1032 | /* At this point we've gone inside the dlm and need to | |
1033 | * complete our work regardless. */ | |
1034 | catch_signals = 0; | |
1035 | ||
1036 | /* wait for busy to clear and carry on */ | |
1037 | goto again; | |
1038 | } | |
1039 | ||
1040 | /* Ok, if we get here then we're good to go. */ | |
1041 | ocfs2_inc_holders(lockres, level); | |
1042 | ||
1043 | ret = 0; | |
1044 | unlock: | |
1045 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1046 | out: | |
1047 | /* | |
1048 | * This is helping work around a lock inversion between the page lock | |
1049 | * and dlm locks. One path holds the page lock while calling aops | |
1050 | * which block acquiring dlm locks. The voting thread holds dlm | |
1051 | * locks while acquiring page locks while down converting data locks. | |
1052 | * This block is helping an aop path notice the inversion and back | |
1053 | * off to unlock its page lock before trying the dlm lock again. | |
1054 | */ | |
1055 | if (wait && arg_flags & OCFS2_LOCK_NONBLOCK && | |
1056 | mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) { | |
1057 | wait = 0; | |
1058 | if (lockres_remove_mask_waiter(lockres, &mw)) | |
1059 | ret = -EAGAIN; | |
1060 | else | |
1061 | goto again; | |
1062 | } | |
1063 | if (wait) { | |
1064 | ret = ocfs2_wait_for_mask(&mw); | |
1065 | if (ret == 0) | |
1066 | goto again; | |
1067 | mlog_errno(ret); | |
1068 | } | |
1069 | ||
1070 | mlog_exit(ret); | |
1071 | return ret; | |
1072 | } | |
1073 | ||
1074 | static void ocfs2_cluster_unlock(struct ocfs2_super *osb, | |
1075 | struct ocfs2_lock_res *lockres, | |
1076 | int level) | |
1077 | { | |
1078 | unsigned long flags; | |
1079 | ||
1080 | mlog_entry_void(); | |
1081 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1082 | ocfs2_dec_holders(lockres, level); | |
34d024f8 | 1083 | ocfs2_downconvert_on_unlock(osb, lockres); |
ccd979bd MF |
1084 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1085 | mlog_exit_void(); | |
1086 | } | |
1087 | ||
da66116e AB |
1088 | static int ocfs2_create_new_lock(struct ocfs2_super *osb, |
1089 | struct ocfs2_lock_res *lockres, | |
1090 | int ex, | |
1091 | int local) | |
ccd979bd | 1092 | { |
d680efe9 | 1093 | int level = ex ? LKM_EXMODE : LKM_PRMODE; |
ccd979bd | 1094 | unsigned long flags; |
24c19ef4 | 1095 | int lkm_flags = local ? LKM_LOCAL : 0; |
ccd979bd MF |
1096 | |
1097 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1098 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); | |
1099 | lockres_or_flags(lockres, OCFS2_LOCK_LOCAL); | |
1100 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1101 | ||
24c19ef4 | 1102 | return ocfs2_lock_create(osb, lockres, level, lkm_flags); |
ccd979bd MF |
1103 | } |
1104 | ||
1105 | /* Grants us an EX lock on the data and metadata resources, skipping | |
1106 | * the normal cluster directory lookup. Use this ONLY on newly created | |
1107 | * inodes which other nodes can't possibly see, and which haven't been | |
1108 | * hashed in the inode hash yet. This can give us a good performance | |
1109 | * increase as it'll skip the network broadcast normally associated | |
1110 | * with creating a new lock resource. */ | |
1111 | int ocfs2_create_new_inode_locks(struct inode *inode) | |
1112 | { | |
1113 | int ret; | |
d680efe9 | 1114 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
1115 | |
1116 | BUG_ON(!inode); | |
1117 | BUG_ON(!ocfs2_inode_is_new(inode)); | |
1118 | ||
1119 | mlog_entry_void(); | |
1120 | ||
b0697053 | 1121 | mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno); |
ccd979bd MF |
1122 | |
1123 | /* NOTE: That we don't increment any of the holder counts, nor | |
1124 | * do we add anything to a journal handle. Since this is | |
1125 | * supposed to be a new inode which the cluster doesn't know | |
1126 | * about yet, there is no need to. As far as the LVB handling | |
1127 | * is concerned, this is basically like acquiring an EX lock | |
1128 | * on a resource which has an invalid one -- we'll set it | |
1129 | * valid when we release the EX. */ | |
1130 | ||
24c19ef4 | 1131 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_rw_lockres, 1, 1); |
ccd979bd MF |
1132 | if (ret) { |
1133 | mlog_errno(ret); | |
1134 | goto bail; | |
1135 | } | |
1136 | ||
24c19ef4 MF |
1137 | /* |
1138 | * We don't want to use LKM_LOCAL on a meta data lock as they | |
1139 | * don't use a generation in their lock names. | |
1140 | */ | |
e63aecb6 | 1141 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_inode_lockres, 1, 0); |
ccd979bd MF |
1142 | if (ret) { |
1143 | mlog_errno(ret); | |
1144 | goto bail; | |
1145 | } | |
1146 | ||
50008630 TY |
1147 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_open_lockres, 0, 0); |
1148 | if (ret) { | |
1149 | mlog_errno(ret); | |
1150 | goto bail; | |
1151 | } | |
1152 | ||
ccd979bd MF |
1153 | bail: |
1154 | mlog_exit(ret); | |
1155 | return ret; | |
1156 | } | |
1157 | ||
1158 | int ocfs2_rw_lock(struct inode *inode, int write) | |
1159 | { | |
1160 | int status, level; | |
1161 | struct ocfs2_lock_res *lockres; | |
c271c5c2 | 1162 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
1163 | |
1164 | BUG_ON(!inode); | |
1165 | ||
1166 | mlog_entry_void(); | |
1167 | ||
b0697053 MF |
1168 | mlog(0, "inode %llu take %s RW lock\n", |
1169 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1170 | write ? "EXMODE" : "PRMODE"); |
1171 | ||
c271c5c2 SM |
1172 | if (ocfs2_mount_local(osb)) |
1173 | return 0; | |
1174 | ||
ccd979bd MF |
1175 | lockres = &OCFS2_I(inode)->ip_rw_lockres; |
1176 | ||
1177 | level = write ? LKM_EXMODE : LKM_PRMODE; | |
1178 | ||
1179 | status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, 0, | |
1180 | 0); | |
1181 | if (status < 0) | |
1182 | mlog_errno(status); | |
1183 | ||
1184 | mlog_exit(status); | |
1185 | return status; | |
1186 | } | |
1187 | ||
1188 | void ocfs2_rw_unlock(struct inode *inode, int write) | |
1189 | { | |
1190 | int level = write ? LKM_EXMODE : LKM_PRMODE; | |
1191 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres; | |
c271c5c2 | 1192 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
1193 | |
1194 | mlog_entry_void(); | |
1195 | ||
b0697053 MF |
1196 | mlog(0, "inode %llu drop %s RW lock\n", |
1197 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1198 | write ? "EXMODE" : "PRMODE"); |
1199 | ||
c271c5c2 SM |
1200 | if (!ocfs2_mount_local(osb)) |
1201 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); | |
ccd979bd MF |
1202 | |
1203 | mlog_exit_void(); | |
1204 | } | |
1205 | ||
50008630 TY |
1206 | /* |
1207 | * ocfs2_open_lock always get PR mode lock. | |
1208 | */ | |
1209 | int ocfs2_open_lock(struct inode *inode) | |
1210 | { | |
1211 | int status = 0; | |
1212 | struct ocfs2_lock_res *lockres; | |
1213 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1214 | ||
1215 | BUG_ON(!inode); | |
1216 | ||
1217 | mlog_entry_void(); | |
1218 | ||
1219 | mlog(0, "inode %llu take PRMODE open lock\n", | |
1220 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
1221 | ||
1222 | if (ocfs2_mount_local(osb)) | |
1223 | goto out; | |
1224 | ||
1225 | lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1226 | ||
1227 | status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, | |
1228 | LKM_PRMODE, 0, 0); | |
1229 | if (status < 0) | |
1230 | mlog_errno(status); | |
1231 | ||
1232 | out: | |
1233 | mlog_exit(status); | |
1234 | return status; | |
1235 | } | |
1236 | ||
1237 | int ocfs2_try_open_lock(struct inode *inode, int write) | |
1238 | { | |
1239 | int status = 0, level; | |
1240 | struct ocfs2_lock_res *lockres; | |
1241 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1242 | ||
1243 | BUG_ON(!inode); | |
1244 | ||
1245 | mlog_entry_void(); | |
1246 | ||
1247 | mlog(0, "inode %llu try to take %s open lock\n", | |
1248 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
1249 | write ? "EXMODE" : "PRMODE"); | |
1250 | ||
1251 | if (ocfs2_mount_local(osb)) | |
1252 | goto out; | |
1253 | ||
1254 | lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1255 | ||
1256 | level = write ? LKM_EXMODE : LKM_PRMODE; | |
1257 | ||
1258 | /* | |
1259 | * The file system may already holding a PRMODE/EXMODE open lock. | |
1260 | * Since we pass LKM_NOQUEUE, the request won't block waiting on | |
1261 | * other nodes and the -EAGAIN will indicate to the caller that | |
1262 | * this inode is still in use. | |
1263 | */ | |
1264 | status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, | |
1265 | level, LKM_NOQUEUE, 0); | |
1266 | ||
1267 | out: | |
1268 | mlog_exit(status); | |
1269 | return status; | |
1270 | } | |
1271 | ||
1272 | /* | |
1273 | * ocfs2_open_unlock unlock PR and EX mode open locks. | |
1274 | */ | |
1275 | void ocfs2_open_unlock(struct inode *inode) | |
1276 | { | |
1277 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1278 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1279 | ||
1280 | mlog_entry_void(); | |
1281 | ||
1282 | mlog(0, "inode %llu drop open lock\n", | |
1283 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
1284 | ||
1285 | if (ocfs2_mount_local(osb)) | |
1286 | goto out; | |
1287 | ||
1288 | if(lockres->l_ro_holders) | |
1289 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, | |
1290 | LKM_PRMODE); | |
1291 | if(lockres->l_ex_holders) | |
1292 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, | |
1293 | LKM_EXMODE); | |
1294 | ||
1295 | out: | |
1296 | mlog_exit_void(); | |
1297 | } | |
1298 | ||
34d024f8 MF |
1299 | static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb, |
1300 | struct ocfs2_lock_res *lockres) | |
ccd979bd MF |
1301 | { |
1302 | int kick = 0; | |
1303 | ||
1304 | mlog_entry_void(); | |
1305 | ||
1306 | /* If we know that another node is waiting on our lock, kick | |
34d024f8 | 1307 | * the downconvert thread * pre-emptively when we reach a release |
ccd979bd MF |
1308 | * condition. */ |
1309 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) { | |
1310 | switch(lockres->l_blocking) { | |
1311 | case LKM_EXMODE: | |
1312 | if (!lockres->l_ex_holders && !lockres->l_ro_holders) | |
1313 | kick = 1; | |
1314 | break; | |
1315 | case LKM_PRMODE: | |
1316 | if (!lockres->l_ex_holders) | |
1317 | kick = 1; | |
1318 | break; | |
1319 | default: | |
1320 | BUG(); | |
1321 | } | |
1322 | } | |
1323 | ||
1324 | if (kick) | |
34d024f8 | 1325 | ocfs2_wake_downconvert_thread(osb); |
ccd979bd MF |
1326 | |
1327 | mlog_exit_void(); | |
1328 | } | |
1329 | ||
ccd979bd MF |
1330 | #define OCFS2_SEC_BITS 34 |
1331 | #define OCFS2_SEC_SHIFT (64 - 34) | |
1332 | #define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1) | |
1333 | ||
1334 | /* LVB only has room for 64 bits of time here so we pack it for | |
1335 | * now. */ | |
1336 | static u64 ocfs2_pack_timespec(struct timespec *spec) | |
1337 | { | |
1338 | u64 res; | |
1339 | u64 sec = spec->tv_sec; | |
1340 | u32 nsec = spec->tv_nsec; | |
1341 | ||
1342 | res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK); | |
1343 | ||
1344 | return res; | |
1345 | } | |
1346 | ||
1347 | /* Call this with the lockres locked. I am reasonably sure we don't | |
1348 | * need ip_lock in this function as anyone who would be changing those | |
e63aecb6 | 1349 | * values is supposed to be blocked in ocfs2_inode_lock right now. */ |
ccd979bd MF |
1350 | static void __ocfs2_stuff_meta_lvb(struct inode *inode) |
1351 | { | |
1352 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
e63aecb6 | 1353 | struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
ccd979bd MF |
1354 | struct ocfs2_meta_lvb *lvb; |
1355 | ||
1356 | mlog_entry_void(); | |
1357 | ||
1358 | lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; | |
1359 | ||
24c19ef4 MF |
1360 | /* |
1361 | * Invalidate the LVB of a deleted inode - this way other | |
1362 | * nodes are forced to go to disk and discover the new inode | |
1363 | * status. | |
1364 | */ | |
1365 | if (oi->ip_flags & OCFS2_INODE_DELETED) { | |
1366 | lvb->lvb_version = 0; | |
1367 | goto out; | |
1368 | } | |
1369 | ||
4d3b83f7 | 1370 | lvb->lvb_version = OCFS2_LVB_VERSION; |
ccd979bd MF |
1371 | lvb->lvb_isize = cpu_to_be64(i_size_read(inode)); |
1372 | lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters); | |
1373 | lvb->lvb_iuid = cpu_to_be32(inode->i_uid); | |
1374 | lvb->lvb_igid = cpu_to_be32(inode->i_gid); | |
1375 | lvb->lvb_imode = cpu_to_be16(inode->i_mode); | |
1376 | lvb->lvb_inlink = cpu_to_be16(inode->i_nlink); | |
1377 | lvb->lvb_iatime_packed = | |
1378 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime)); | |
1379 | lvb->lvb_ictime_packed = | |
1380 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime)); | |
1381 | lvb->lvb_imtime_packed = | |
1382 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime)); | |
ca4d147e | 1383 | lvb->lvb_iattr = cpu_to_be32(oi->ip_attr); |
15b1e36b | 1384 | lvb->lvb_idynfeatures = cpu_to_be16(oi->ip_dyn_features); |
f9e2d82e | 1385 | lvb->lvb_igeneration = cpu_to_be32(inode->i_generation); |
ccd979bd | 1386 | |
24c19ef4 | 1387 | out: |
ccd979bd MF |
1388 | mlog_meta_lvb(0, lockres); |
1389 | ||
1390 | mlog_exit_void(); | |
1391 | } | |
1392 | ||
1393 | static void ocfs2_unpack_timespec(struct timespec *spec, | |
1394 | u64 packed_time) | |
1395 | { | |
1396 | spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT; | |
1397 | spec->tv_nsec = packed_time & OCFS2_NSEC_MASK; | |
1398 | } | |
1399 | ||
1400 | static void ocfs2_refresh_inode_from_lvb(struct inode *inode) | |
1401 | { | |
1402 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
e63aecb6 | 1403 | struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
ccd979bd MF |
1404 | struct ocfs2_meta_lvb *lvb; |
1405 | ||
1406 | mlog_entry_void(); | |
1407 | ||
1408 | mlog_meta_lvb(0, lockres); | |
1409 | ||
1410 | lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; | |
1411 | ||
1412 | /* We're safe here without the lockres lock... */ | |
1413 | spin_lock(&oi->ip_lock); | |
1414 | oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters); | |
1415 | i_size_write(inode, be64_to_cpu(lvb->lvb_isize)); | |
1416 | ||
ca4d147e | 1417 | oi->ip_attr = be32_to_cpu(lvb->lvb_iattr); |
15b1e36b | 1418 | oi->ip_dyn_features = be16_to_cpu(lvb->lvb_idynfeatures); |
ca4d147e HP |
1419 | ocfs2_set_inode_flags(inode); |
1420 | ||
ccd979bd MF |
1421 | /* fast-symlinks are a special case */ |
1422 | if (S_ISLNK(inode->i_mode) && !oi->ip_clusters) | |
1423 | inode->i_blocks = 0; | |
1424 | else | |
8110b073 | 1425 | inode->i_blocks = ocfs2_inode_sector_count(inode); |
ccd979bd MF |
1426 | |
1427 | inode->i_uid = be32_to_cpu(lvb->lvb_iuid); | |
1428 | inode->i_gid = be32_to_cpu(lvb->lvb_igid); | |
1429 | inode->i_mode = be16_to_cpu(lvb->lvb_imode); | |
1430 | inode->i_nlink = be16_to_cpu(lvb->lvb_inlink); | |
1431 | ocfs2_unpack_timespec(&inode->i_atime, | |
1432 | be64_to_cpu(lvb->lvb_iatime_packed)); | |
1433 | ocfs2_unpack_timespec(&inode->i_mtime, | |
1434 | be64_to_cpu(lvb->lvb_imtime_packed)); | |
1435 | ocfs2_unpack_timespec(&inode->i_ctime, | |
1436 | be64_to_cpu(lvb->lvb_ictime_packed)); | |
1437 | spin_unlock(&oi->ip_lock); | |
1438 | ||
1439 | mlog_exit_void(); | |
1440 | } | |
1441 | ||
f9e2d82e MF |
1442 | static inline int ocfs2_meta_lvb_is_trustable(struct inode *inode, |
1443 | struct ocfs2_lock_res *lockres) | |
ccd979bd MF |
1444 | { |
1445 | struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; | |
1446 | ||
f9e2d82e MF |
1447 | if (lvb->lvb_version == OCFS2_LVB_VERSION |
1448 | && be32_to_cpu(lvb->lvb_igeneration) == inode->i_generation) | |
ccd979bd MF |
1449 | return 1; |
1450 | return 0; | |
1451 | } | |
1452 | ||
1453 | /* Determine whether a lock resource needs to be refreshed, and | |
1454 | * arbitrate who gets to refresh it. | |
1455 | * | |
1456 | * 0 means no refresh needed. | |
1457 | * | |
1458 | * > 0 means you need to refresh this and you MUST call | |
1459 | * ocfs2_complete_lock_res_refresh afterwards. */ | |
1460 | static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres) | |
1461 | { | |
1462 | unsigned long flags; | |
1463 | int status = 0; | |
1464 | ||
1465 | mlog_entry_void(); | |
1466 | ||
1467 | refresh_check: | |
1468 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1469 | if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) { | |
1470 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1471 | goto bail; | |
1472 | } | |
1473 | ||
1474 | if (lockres->l_flags & OCFS2_LOCK_REFRESHING) { | |
1475 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1476 | ||
1477 | ocfs2_wait_on_refreshing_lock(lockres); | |
1478 | goto refresh_check; | |
1479 | } | |
1480 | ||
1481 | /* Ok, I'll be the one to refresh this lock. */ | |
1482 | lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING); | |
1483 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1484 | ||
1485 | status = 1; | |
1486 | bail: | |
1487 | mlog_exit(status); | |
1488 | return status; | |
1489 | } | |
1490 | ||
1491 | /* If status is non zero, I'll mark it as not being in refresh | |
1492 | * anymroe, but i won't clear the needs refresh flag. */ | |
1493 | static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres, | |
1494 | int status) | |
1495 | { | |
1496 | unsigned long flags; | |
1497 | mlog_entry_void(); | |
1498 | ||
1499 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1500 | lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING); | |
1501 | if (!status) | |
1502 | lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); | |
1503 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1504 | ||
1505 | wake_up(&lockres->l_event); | |
1506 | ||
1507 | mlog_exit_void(); | |
1508 | } | |
1509 | ||
1510 | /* may or may not return a bh if it went to disk. */ | |
e63aecb6 | 1511 | static int ocfs2_inode_lock_update(struct inode *inode, |
ccd979bd MF |
1512 | struct buffer_head **bh) |
1513 | { | |
1514 | int status = 0; | |
1515 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
e63aecb6 | 1516 | struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
ccd979bd | 1517 | struct ocfs2_dinode *fe; |
c271c5c2 | 1518 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
1519 | |
1520 | mlog_entry_void(); | |
1521 | ||
be9e986b MF |
1522 | if (ocfs2_mount_local(osb)) |
1523 | goto bail; | |
1524 | ||
ccd979bd MF |
1525 | spin_lock(&oi->ip_lock); |
1526 | if (oi->ip_flags & OCFS2_INODE_DELETED) { | |
b0697053 | 1527 | mlog(0, "Orphaned inode %llu was deleted while we " |
ccd979bd | 1528 | "were waiting on a lock. ip_flags = 0x%x\n", |
b0697053 | 1529 | (unsigned long long)oi->ip_blkno, oi->ip_flags); |
ccd979bd MF |
1530 | spin_unlock(&oi->ip_lock); |
1531 | status = -ENOENT; | |
1532 | goto bail; | |
1533 | } | |
1534 | spin_unlock(&oi->ip_lock); | |
1535 | ||
be9e986b MF |
1536 | if (!ocfs2_should_refresh_lock_res(lockres)) |
1537 | goto bail; | |
ccd979bd MF |
1538 | |
1539 | /* This will discard any caching information we might have had | |
1540 | * for the inode metadata. */ | |
1541 | ocfs2_metadata_cache_purge(inode); | |
1542 | ||
83418978 MF |
1543 | ocfs2_extent_map_trunc(inode, 0); |
1544 | ||
be9e986b | 1545 | if (ocfs2_meta_lvb_is_trustable(inode, lockres)) { |
b0697053 MF |
1546 | mlog(0, "Trusting LVB on inode %llu\n", |
1547 | (unsigned long long)oi->ip_blkno); | |
ccd979bd MF |
1548 | ocfs2_refresh_inode_from_lvb(inode); |
1549 | } else { | |
1550 | /* Boo, we have to go to disk. */ | |
1551 | /* read bh, cast, ocfs2_refresh_inode */ | |
1552 | status = ocfs2_read_block(OCFS2_SB(inode->i_sb), oi->ip_blkno, | |
1553 | bh, OCFS2_BH_CACHED, inode); | |
1554 | if (status < 0) { | |
1555 | mlog_errno(status); | |
1556 | goto bail_refresh; | |
1557 | } | |
1558 | fe = (struct ocfs2_dinode *) (*bh)->b_data; | |
1559 | ||
1560 | /* This is a good chance to make sure we're not | |
1561 | * locking an invalid object. | |
1562 | * | |
1563 | * We bug on a stale inode here because we checked | |
1564 | * above whether it was wiped from disk. The wiping | |
1565 | * node provides a guarantee that we receive that | |
1566 | * message and can mark the inode before dropping any | |
1567 | * locks associated with it. */ | |
1568 | if (!OCFS2_IS_VALID_DINODE(fe)) { | |
1569 | OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); | |
1570 | status = -EIO; | |
1571 | goto bail_refresh; | |
1572 | } | |
1573 | mlog_bug_on_msg(inode->i_generation != | |
1574 | le32_to_cpu(fe->i_generation), | |
b0697053 | 1575 | "Invalid dinode %llu disk generation: %u " |
ccd979bd | 1576 | "inode->i_generation: %u\n", |
b0697053 MF |
1577 | (unsigned long long)oi->ip_blkno, |
1578 | le32_to_cpu(fe->i_generation), | |
ccd979bd MF |
1579 | inode->i_generation); |
1580 | mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) || | |
1581 | !(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)), | |
b0697053 MF |
1582 | "Stale dinode %llu dtime: %llu flags: 0x%x\n", |
1583 | (unsigned long long)oi->ip_blkno, | |
1584 | (unsigned long long)le64_to_cpu(fe->i_dtime), | |
ccd979bd MF |
1585 | le32_to_cpu(fe->i_flags)); |
1586 | ||
1587 | ocfs2_refresh_inode(inode, fe); | |
1588 | } | |
1589 | ||
1590 | status = 0; | |
1591 | bail_refresh: | |
be9e986b | 1592 | ocfs2_complete_lock_res_refresh(lockres, status); |
ccd979bd MF |
1593 | bail: |
1594 | mlog_exit(status); | |
1595 | return status; | |
1596 | } | |
1597 | ||
1598 | static int ocfs2_assign_bh(struct inode *inode, | |
1599 | struct buffer_head **ret_bh, | |
1600 | struct buffer_head *passed_bh) | |
1601 | { | |
1602 | int status; | |
1603 | ||
1604 | if (passed_bh) { | |
1605 | /* Ok, the update went to disk for us, use the | |
1606 | * returned bh. */ | |
1607 | *ret_bh = passed_bh; | |
1608 | get_bh(*ret_bh); | |
1609 | ||
1610 | return 0; | |
1611 | } | |
1612 | ||
1613 | status = ocfs2_read_block(OCFS2_SB(inode->i_sb), | |
1614 | OCFS2_I(inode)->ip_blkno, | |
1615 | ret_bh, | |
1616 | OCFS2_BH_CACHED, | |
1617 | inode); | |
1618 | if (status < 0) | |
1619 | mlog_errno(status); | |
1620 | ||
1621 | return status; | |
1622 | } | |
1623 | ||
1624 | /* | |
1625 | * returns < 0 error if the callback will never be called, otherwise | |
1626 | * the result of the lock will be communicated via the callback. | |
1627 | */ | |
e63aecb6 | 1628 | int ocfs2_inode_lock_full(struct inode *inode, |
ccd979bd MF |
1629 | struct buffer_head **ret_bh, |
1630 | int ex, | |
1631 | int arg_flags) | |
1632 | { | |
1633 | int status, level, dlm_flags, acquired; | |
c271c5c2 | 1634 | struct ocfs2_lock_res *lockres = NULL; |
ccd979bd MF |
1635 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
1636 | struct buffer_head *local_bh = NULL; | |
1637 | ||
1638 | BUG_ON(!inode); | |
1639 | ||
1640 | mlog_entry_void(); | |
1641 | ||
b0697053 MF |
1642 | mlog(0, "inode %llu, take %s META lock\n", |
1643 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1644 | ex ? "EXMODE" : "PRMODE"); |
1645 | ||
1646 | status = 0; | |
1647 | acquired = 0; | |
1648 | /* We'll allow faking a readonly metadata lock for | |
1649 | * rodevices. */ | |
1650 | if (ocfs2_is_hard_readonly(osb)) { | |
1651 | if (ex) | |
1652 | status = -EROFS; | |
1653 | goto bail; | |
1654 | } | |
1655 | ||
c271c5c2 SM |
1656 | if (ocfs2_mount_local(osb)) |
1657 | goto local; | |
1658 | ||
ccd979bd MF |
1659 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) |
1660 | wait_event(osb->recovery_event, | |
1661 | ocfs2_node_map_is_empty(osb, &osb->recovery_map)); | |
1662 | ||
e63aecb6 | 1663 | lockres = &OCFS2_I(inode)->ip_inode_lockres; |
ccd979bd MF |
1664 | level = ex ? LKM_EXMODE : LKM_PRMODE; |
1665 | dlm_flags = 0; | |
1666 | if (arg_flags & OCFS2_META_LOCK_NOQUEUE) | |
1667 | dlm_flags |= LKM_NOQUEUE; | |
1668 | ||
1669 | status = ocfs2_cluster_lock(osb, lockres, level, dlm_flags, arg_flags); | |
1670 | if (status < 0) { | |
1671 | if (status != -EAGAIN && status != -EIOCBRETRY) | |
1672 | mlog_errno(status); | |
1673 | goto bail; | |
1674 | } | |
1675 | ||
1676 | /* Notify the error cleanup path to drop the cluster lock. */ | |
1677 | acquired = 1; | |
1678 | ||
1679 | /* We wait twice because a node may have died while we were in | |
1680 | * the lower dlm layers. The second time though, we've | |
1681 | * committed to owning this lock so we don't allow signals to | |
1682 | * abort the operation. */ | |
1683 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) | |
1684 | wait_event(osb->recovery_event, | |
1685 | ocfs2_node_map_is_empty(osb, &osb->recovery_map)); | |
1686 | ||
c271c5c2 | 1687 | local: |
24c19ef4 MF |
1688 | /* |
1689 | * We only see this flag if we're being called from | |
1690 | * ocfs2_read_locked_inode(). It means we're locking an inode | |
1691 | * which hasn't been populated yet, so clear the refresh flag | |
1692 | * and let the caller handle it. | |
1693 | */ | |
1694 | if (inode->i_state & I_NEW) { | |
1695 | status = 0; | |
c271c5c2 SM |
1696 | if (lockres) |
1697 | ocfs2_complete_lock_res_refresh(lockres, 0); | |
24c19ef4 MF |
1698 | goto bail; |
1699 | } | |
1700 | ||
ccd979bd | 1701 | /* This is fun. The caller may want a bh back, or it may |
e63aecb6 | 1702 | * not. ocfs2_inode_lock_update definitely wants one in, but |
ccd979bd MF |
1703 | * may or may not read one, depending on what's in the |
1704 | * LVB. The result of all of this is that we've *only* gone to | |
1705 | * disk if we have to, so the complexity is worthwhile. */ | |
e63aecb6 | 1706 | status = ocfs2_inode_lock_update(inode, &local_bh); |
ccd979bd MF |
1707 | if (status < 0) { |
1708 | if (status != -ENOENT) | |
1709 | mlog_errno(status); | |
1710 | goto bail; | |
1711 | } | |
1712 | ||
1713 | if (ret_bh) { | |
1714 | status = ocfs2_assign_bh(inode, ret_bh, local_bh); | |
1715 | if (status < 0) { | |
1716 | mlog_errno(status); | |
1717 | goto bail; | |
1718 | } | |
1719 | } | |
1720 | ||
ccd979bd MF |
1721 | bail: |
1722 | if (status < 0) { | |
1723 | if (ret_bh && (*ret_bh)) { | |
1724 | brelse(*ret_bh); | |
1725 | *ret_bh = NULL; | |
1726 | } | |
1727 | if (acquired) | |
e63aecb6 | 1728 | ocfs2_inode_unlock(inode, ex); |
ccd979bd MF |
1729 | } |
1730 | ||
1731 | if (local_bh) | |
1732 | brelse(local_bh); | |
1733 | ||
1734 | mlog_exit(status); | |
1735 | return status; | |
1736 | } | |
1737 | ||
1738 | /* | |
34d024f8 MF |
1739 | * This is working around a lock inversion between tasks acquiring DLM |
1740 | * locks while holding a page lock and the downconvert thread which | |
1741 | * blocks dlm lock acquiry while acquiring page locks. | |
ccd979bd MF |
1742 | * |
1743 | * ** These _with_page variantes are only intended to be called from aop | |
1744 | * methods that hold page locks and return a very specific *positive* error | |
1745 | * code that aop methods pass up to the VFS -- test for errors with != 0. ** | |
1746 | * | |
34d024f8 MF |
1747 | * The DLM is called such that it returns -EAGAIN if it would have |
1748 | * blocked waiting for the downconvert thread. In that case we unlock | |
1749 | * our page so the downconvert thread can make progress. Once we've | |
1750 | * done this we have to return AOP_TRUNCATED_PAGE so the aop method | |
1751 | * that called us can bubble that back up into the VFS who will then | |
1752 | * immediately retry the aop call. | |
ccd979bd MF |
1753 | * |
1754 | * We do a blocking lock and immediate unlock before returning, though, so that | |
1755 | * the lock has a great chance of being cached on this node by the time the VFS | |
1756 | * calls back to retry the aop. This has a potential to livelock as nodes | |
1757 | * ping locks back and forth, but that's a risk we're willing to take to avoid | |
1758 | * the lock inversion simply. | |
1759 | */ | |
e63aecb6 | 1760 | int ocfs2_inode_lock_with_page(struct inode *inode, |
ccd979bd MF |
1761 | struct buffer_head **ret_bh, |
1762 | int ex, | |
1763 | struct page *page) | |
1764 | { | |
1765 | int ret; | |
1766 | ||
e63aecb6 | 1767 | ret = ocfs2_inode_lock_full(inode, ret_bh, ex, OCFS2_LOCK_NONBLOCK); |
ccd979bd MF |
1768 | if (ret == -EAGAIN) { |
1769 | unlock_page(page); | |
e63aecb6 MF |
1770 | if (ocfs2_inode_lock(inode, ret_bh, ex) == 0) |
1771 | ocfs2_inode_unlock(inode, ex); | |
ccd979bd MF |
1772 | ret = AOP_TRUNCATED_PAGE; |
1773 | } | |
1774 | ||
1775 | return ret; | |
1776 | } | |
1777 | ||
e63aecb6 | 1778 | int ocfs2_inode_lock_atime(struct inode *inode, |
7f1a37e3 TY |
1779 | struct vfsmount *vfsmnt, |
1780 | int *level) | |
1781 | { | |
1782 | int ret; | |
1783 | ||
1784 | mlog_entry_void(); | |
e63aecb6 | 1785 | ret = ocfs2_inode_lock(inode, NULL, 0); |
7f1a37e3 TY |
1786 | if (ret < 0) { |
1787 | mlog_errno(ret); | |
1788 | return ret; | |
1789 | } | |
1790 | ||
1791 | /* | |
1792 | * If we should update atime, we will get EX lock, | |
1793 | * otherwise we just get PR lock. | |
1794 | */ | |
1795 | if (ocfs2_should_update_atime(inode, vfsmnt)) { | |
1796 | struct buffer_head *bh = NULL; | |
1797 | ||
e63aecb6 MF |
1798 | ocfs2_inode_unlock(inode, 0); |
1799 | ret = ocfs2_inode_lock(inode, &bh, 1); | |
7f1a37e3 TY |
1800 | if (ret < 0) { |
1801 | mlog_errno(ret); | |
1802 | return ret; | |
1803 | } | |
1804 | *level = 1; | |
1805 | if (ocfs2_should_update_atime(inode, vfsmnt)) | |
1806 | ocfs2_update_inode_atime(inode, bh); | |
1807 | if (bh) | |
1808 | brelse(bh); | |
1809 | } else | |
1810 | *level = 0; | |
1811 | ||
1812 | mlog_exit(ret); | |
1813 | return ret; | |
1814 | } | |
1815 | ||
e63aecb6 | 1816 | void ocfs2_inode_unlock(struct inode *inode, |
ccd979bd MF |
1817 | int ex) |
1818 | { | |
1819 | int level = ex ? LKM_EXMODE : LKM_PRMODE; | |
e63aecb6 | 1820 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_inode_lockres; |
c271c5c2 | 1821 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
1822 | |
1823 | mlog_entry_void(); | |
1824 | ||
b0697053 MF |
1825 | mlog(0, "inode %llu drop %s META lock\n", |
1826 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1827 | ex ? "EXMODE" : "PRMODE"); |
1828 | ||
c271c5c2 SM |
1829 | if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)) && |
1830 | !ocfs2_mount_local(osb)) | |
ccd979bd MF |
1831 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); |
1832 | ||
1833 | mlog_exit_void(); | |
1834 | } | |
1835 | ||
1836 | int ocfs2_super_lock(struct ocfs2_super *osb, | |
1837 | int ex) | |
1838 | { | |
c271c5c2 | 1839 | int status = 0; |
ccd979bd MF |
1840 | int level = ex ? LKM_EXMODE : LKM_PRMODE; |
1841 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; | |
1842 | struct buffer_head *bh; | |
1843 | struct ocfs2_slot_info *si = osb->slot_info; | |
1844 | ||
1845 | mlog_entry_void(); | |
1846 | ||
1847 | if (ocfs2_is_hard_readonly(osb)) | |
1848 | return -EROFS; | |
1849 | ||
c271c5c2 SM |
1850 | if (ocfs2_mount_local(osb)) |
1851 | goto bail; | |
1852 | ||
ccd979bd MF |
1853 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); |
1854 | if (status < 0) { | |
1855 | mlog_errno(status); | |
1856 | goto bail; | |
1857 | } | |
1858 | ||
1859 | /* The super block lock path is really in the best position to | |
1860 | * know when resources covered by the lock need to be | |
1861 | * refreshed, so we do it here. Of course, making sense of | |
1862 | * everything is up to the caller :) */ | |
1863 | status = ocfs2_should_refresh_lock_res(lockres); | |
1864 | if (status < 0) { | |
1865 | mlog_errno(status); | |
1866 | goto bail; | |
1867 | } | |
1868 | if (status) { | |
1869 | bh = si->si_bh; | |
1870 | status = ocfs2_read_block(osb, bh->b_blocknr, &bh, 0, | |
1871 | si->si_inode); | |
1872 | if (status == 0) | |
1873 | ocfs2_update_slot_info(si); | |
1874 | ||
1875 | ocfs2_complete_lock_res_refresh(lockres, status); | |
1876 | ||
1877 | if (status < 0) | |
1878 | mlog_errno(status); | |
1879 | } | |
1880 | bail: | |
1881 | mlog_exit(status); | |
1882 | return status; | |
1883 | } | |
1884 | ||
1885 | void ocfs2_super_unlock(struct ocfs2_super *osb, | |
1886 | int ex) | |
1887 | { | |
1888 | int level = ex ? LKM_EXMODE : LKM_PRMODE; | |
1889 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; | |
1890 | ||
c271c5c2 SM |
1891 | if (!ocfs2_mount_local(osb)) |
1892 | ocfs2_cluster_unlock(osb, lockres, level); | |
ccd979bd MF |
1893 | } |
1894 | ||
1895 | int ocfs2_rename_lock(struct ocfs2_super *osb) | |
1896 | { | |
1897 | int status; | |
1898 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; | |
1899 | ||
1900 | if (ocfs2_is_hard_readonly(osb)) | |
1901 | return -EROFS; | |
1902 | ||
c271c5c2 SM |
1903 | if (ocfs2_mount_local(osb)) |
1904 | return 0; | |
1905 | ||
ccd979bd MF |
1906 | status = ocfs2_cluster_lock(osb, lockres, LKM_EXMODE, 0, 0); |
1907 | if (status < 0) | |
1908 | mlog_errno(status); | |
1909 | ||
1910 | return status; | |
1911 | } | |
1912 | ||
1913 | void ocfs2_rename_unlock(struct ocfs2_super *osb) | |
1914 | { | |
1915 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; | |
1916 | ||
c271c5c2 SM |
1917 | if (!ocfs2_mount_local(osb)) |
1918 | ocfs2_cluster_unlock(osb, lockres, LKM_EXMODE); | |
ccd979bd MF |
1919 | } |
1920 | ||
d680efe9 MF |
1921 | int ocfs2_dentry_lock(struct dentry *dentry, int ex) |
1922 | { | |
1923 | int ret; | |
1924 | int level = ex ? LKM_EXMODE : LKM_PRMODE; | |
1925 | struct ocfs2_dentry_lock *dl = dentry->d_fsdata; | |
1926 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); | |
1927 | ||
1928 | BUG_ON(!dl); | |
1929 | ||
1930 | if (ocfs2_is_hard_readonly(osb)) | |
1931 | return -EROFS; | |
1932 | ||
c271c5c2 SM |
1933 | if (ocfs2_mount_local(osb)) |
1934 | return 0; | |
1935 | ||
d680efe9 MF |
1936 | ret = ocfs2_cluster_lock(osb, &dl->dl_lockres, level, 0, 0); |
1937 | if (ret < 0) | |
1938 | mlog_errno(ret); | |
1939 | ||
1940 | return ret; | |
1941 | } | |
1942 | ||
1943 | void ocfs2_dentry_unlock(struct dentry *dentry, int ex) | |
1944 | { | |
1945 | int level = ex ? LKM_EXMODE : LKM_PRMODE; | |
1946 | struct ocfs2_dentry_lock *dl = dentry->d_fsdata; | |
1947 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); | |
1948 | ||
c271c5c2 SM |
1949 | if (!ocfs2_mount_local(osb)) |
1950 | ocfs2_cluster_unlock(osb, &dl->dl_lockres, level); | |
d680efe9 MF |
1951 | } |
1952 | ||
ccd979bd MF |
1953 | /* Reference counting of the dlm debug structure. We want this because |
1954 | * open references on the debug inodes can live on after a mount, so | |
1955 | * we can't rely on the ocfs2_super to always exist. */ | |
1956 | static void ocfs2_dlm_debug_free(struct kref *kref) | |
1957 | { | |
1958 | struct ocfs2_dlm_debug *dlm_debug; | |
1959 | ||
1960 | dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt); | |
1961 | ||
1962 | kfree(dlm_debug); | |
1963 | } | |
1964 | ||
1965 | void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug) | |
1966 | { | |
1967 | if (dlm_debug) | |
1968 | kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free); | |
1969 | } | |
1970 | ||
1971 | static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug) | |
1972 | { | |
1973 | kref_get(&debug->d_refcnt); | |
1974 | } | |
1975 | ||
1976 | struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void) | |
1977 | { | |
1978 | struct ocfs2_dlm_debug *dlm_debug; | |
1979 | ||
1980 | dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL); | |
1981 | if (!dlm_debug) { | |
1982 | mlog_errno(-ENOMEM); | |
1983 | goto out; | |
1984 | } | |
1985 | ||
1986 | kref_init(&dlm_debug->d_refcnt); | |
1987 | INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking); | |
1988 | dlm_debug->d_locking_state = NULL; | |
1989 | out: | |
1990 | return dlm_debug; | |
1991 | } | |
1992 | ||
1993 | /* Access to this is arbitrated for us via seq_file->sem. */ | |
1994 | struct ocfs2_dlm_seq_priv { | |
1995 | struct ocfs2_dlm_debug *p_dlm_debug; | |
1996 | struct ocfs2_lock_res p_iter_res; | |
1997 | struct ocfs2_lock_res p_tmp_res; | |
1998 | }; | |
1999 | ||
2000 | static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start, | |
2001 | struct ocfs2_dlm_seq_priv *priv) | |
2002 | { | |
2003 | struct ocfs2_lock_res *iter, *ret = NULL; | |
2004 | struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug; | |
2005 | ||
2006 | assert_spin_locked(&ocfs2_dlm_tracking_lock); | |
2007 | ||
2008 | list_for_each_entry(iter, &start->l_debug_list, l_debug_list) { | |
2009 | /* discover the head of the list */ | |
2010 | if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) { | |
2011 | mlog(0, "End of list found, %p\n", ret); | |
2012 | break; | |
2013 | } | |
2014 | ||
2015 | /* We track our "dummy" iteration lockres' by a NULL | |
2016 | * l_ops field. */ | |
2017 | if (iter->l_ops != NULL) { | |
2018 | ret = iter; | |
2019 | break; | |
2020 | } | |
2021 | } | |
2022 | ||
2023 | return ret; | |
2024 | } | |
2025 | ||
2026 | static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos) | |
2027 | { | |
2028 | struct ocfs2_dlm_seq_priv *priv = m->private; | |
2029 | struct ocfs2_lock_res *iter; | |
2030 | ||
2031 | spin_lock(&ocfs2_dlm_tracking_lock); | |
2032 | iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv); | |
2033 | if (iter) { | |
2034 | /* Since lockres' have the lifetime of their container | |
2035 | * (which can be inodes, ocfs2_supers, etc) we want to | |
2036 | * copy this out to a temporary lockres while still | |
2037 | * under the spinlock. Obviously after this we can't | |
2038 | * trust any pointers on the copy returned, but that's | |
2039 | * ok as the information we want isn't typically held | |
2040 | * in them. */ | |
2041 | priv->p_tmp_res = *iter; | |
2042 | iter = &priv->p_tmp_res; | |
2043 | } | |
2044 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
2045 | ||
2046 | return iter; | |
2047 | } | |
2048 | ||
2049 | static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v) | |
2050 | { | |
2051 | } | |
2052 | ||
2053 | static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
2054 | { | |
2055 | struct ocfs2_dlm_seq_priv *priv = m->private; | |
2056 | struct ocfs2_lock_res *iter = v; | |
2057 | struct ocfs2_lock_res *dummy = &priv->p_iter_res; | |
2058 | ||
2059 | spin_lock(&ocfs2_dlm_tracking_lock); | |
2060 | iter = ocfs2_dlm_next_res(iter, priv); | |
2061 | list_del_init(&dummy->l_debug_list); | |
2062 | if (iter) { | |
2063 | list_add(&dummy->l_debug_list, &iter->l_debug_list); | |
2064 | priv->p_tmp_res = *iter; | |
2065 | iter = &priv->p_tmp_res; | |
2066 | } | |
2067 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
2068 | ||
2069 | return iter; | |
2070 | } | |
2071 | ||
2072 | /* So that debugfs.ocfs2 can determine which format is being used */ | |
2073 | #define OCFS2_DLM_DEBUG_STR_VERSION 1 | |
2074 | static int ocfs2_dlm_seq_show(struct seq_file *m, void *v) | |
2075 | { | |
2076 | int i; | |
2077 | char *lvb; | |
2078 | struct ocfs2_lock_res *lockres = v; | |
2079 | ||
2080 | if (!lockres) | |
2081 | return -EINVAL; | |
2082 | ||
d680efe9 MF |
2083 | seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION); |
2084 | ||
2085 | if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY) | |
2086 | seq_printf(m, "%.*s%08x\t", OCFS2_DENTRY_LOCK_INO_START - 1, | |
2087 | lockres->l_name, | |
2088 | (unsigned int)ocfs2_get_dentry_lock_ino(lockres)); | |
2089 | else | |
2090 | seq_printf(m, "%.*s\t", OCFS2_LOCK_ID_MAX_LEN, lockres->l_name); | |
2091 | ||
2092 | seq_printf(m, "%d\t" | |
ccd979bd MF |
2093 | "0x%lx\t" |
2094 | "0x%x\t" | |
2095 | "0x%x\t" | |
2096 | "%u\t" | |
2097 | "%u\t" | |
2098 | "%d\t" | |
2099 | "%d\t", | |
ccd979bd MF |
2100 | lockres->l_level, |
2101 | lockres->l_flags, | |
2102 | lockres->l_action, | |
2103 | lockres->l_unlock_action, | |
2104 | lockres->l_ro_holders, | |
2105 | lockres->l_ex_holders, | |
2106 | lockres->l_requested, | |
2107 | lockres->l_blocking); | |
2108 | ||
2109 | /* Dump the raw LVB */ | |
2110 | lvb = lockres->l_lksb.lvb; | |
2111 | for(i = 0; i < DLM_LVB_LEN; i++) | |
2112 | seq_printf(m, "0x%x\t", lvb[i]); | |
2113 | ||
2114 | /* End the line */ | |
2115 | seq_printf(m, "\n"); | |
2116 | return 0; | |
2117 | } | |
2118 | ||
2119 | static struct seq_operations ocfs2_dlm_seq_ops = { | |
2120 | .start = ocfs2_dlm_seq_start, | |
2121 | .stop = ocfs2_dlm_seq_stop, | |
2122 | .next = ocfs2_dlm_seq_next, | |
2123 | .show = ocfs2_dlm_seq_show, | |
2124 | }; | |
2125 | ||
2126 | static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file) | |
2127 | { | |
2128 | struct seq_file *seq = (struct seq_file *) file->private_data; | |
2129 | struct ocfs2_dlm_seq_priv *priv = seq->private; | |
2130 | struct ocfs2_lock_res *res = &priv->p_iter_res; | |
2131 | ||
2132 | ocfs2_remove_lockres_tracking(res); | |
2133 | ocfs2_put_dlm_debug(priv->p_dlm_debug); | |
2134 | return seq_release_private(inode, file); | |
2135 | } | |
2136 | ||
2137 | static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file) | |
2138 | { | |
2139 | int ret; | |
2140 | struct ocfs2_dlm_seq_priv *priv; | |
2141 | struct seq_file *seq; | |
2142 | struct ocfs2_super *osb; | |
2143 | ||
2144 | priv = kzalloc(sizeof(struct ocfs2_dlm_seq_priv), GFP_KERNEL); | |
2145 | if (!priv) { | |
2146 | ret = -ENOMEM; | |
2147 | mlog_errno(ret); | |
2148 | goto out; | |
2149 | } | |
8e18e294 | 2150 | osb = inode->i_private; |
ccd979bd MF |
2151 | ocfs2_get_dlm_debug(osb->osb_dlm_debug); |
2152 | priv->p_dlm_debug = osb->osb_dlm_debug; | |
2153 | INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list); | |
2154 | ||
2155 | ret = seq_open(file, &ocfs2_dlm_seq_ops); | |
2156 | if (ret) { | |
2157 | kfree(priv); | |
2158 | mlog_errno(ret); | |
2159 | goto out; | |
2160 | } | |
2161 | ||
2162 | seq = (struct seq_file *) file->private_data; | |
2163 | seq->private = priv; | |
2164 | ||
2165 | ocfs2_add_lockres_tracking(&priv->p_iter_res, | |
2166 | priv->p_dlm_debug); | |
2167 | ||
2168 | out: | |
2169 | return ret; | |
2170 | } | |
2171 | ||
4b6f5d20 | 2172 | static const struct file_operations ocfs2_dlm_debug_fops = { |
ccd979bd MF |
2173 | .open = ocfs2_dlm_debug_open, |
2174 | .release = ocfs2_dlm_debug_release, | |
2175 | .read = seq_read, | |
2176 | .llseek = seq_lseek, | |
2177 | }; | |
2178 | ||
2179 | static int ocfs2_dlm_init_debug(struct ocfs2_super *osb) | |
2180 | { | |
2181 | int ret = 0; | |
2182 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; | |
2183 | ||
2184 | dlm_debug->d_locking_state = debugfs_create_file("locking_state", | |
2185 | S_IFREG|S_IRUSR, | |
2186 | osb->osb_debug_root, | |
2187 | osb, | |
2188 | &ocfs2_dlm_debug_fops); | |
2189 | if (!dlm_debug->d_locking_state) { | |
2190 | ret = -EINVAL; | |
2191 | mlog(ML_ERROR, | |
2192 | "Unable to create locking state debugfs file.\n"); | |
2193 | goto out; | |
2194 | } | |
2195 | ||
2196 | ocfs2_get_dlm_debug(dlm_debug); | |
2197 | out: | |
2198 | return ret; | |
2199 | } | |
2200 | ||
2201 | static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb) | |
2202 | { | |
2203 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; | |
2204 | ||
2205 | if (dlm_debug) { | |
2206 | debugfs_remove(dlm_debug->d_locking_state); | |
2207 | ocfs2_put_dlm_debug(dlm_debug); | |
2208 | } | |
2209 | } | |
2210 | ||
2211 | int ocfs2_dlm_init(struct ocfs2_super *osb) | |
2212 | { | |
c271c5c2 | 2213 | int status = 0; |
ccd979bd | 2214 | u32 dlm_key; |
c271c5c2 | 2215 | struct dlm_ctxt *dlm = NULL; |
ccd979bd MF |
2216 | |
2217 | mlog_entry_void(); | |
2218 | ||
c271c5c2 SM |
2219 | if (ocfs2_mount_local(osb)) |
2220 | goto local; | |
2221 | ||
ccd979bd MF |
2222 | status = ocfs2_dlm_init_debug(osb); |
2223 | if (status < 0) { | |
2224 | mlog_errno(status); | |
2225 | goto bail; | |
2226 | } | |
2227 | ||
34d024f8 MF |
2228 | /* launch downconvert thread */ |
2229 | osb->dc_task = kthread_run(ocfs2_downconvert_thread, osb, "ocfs2dc"); | |
2230 | if (IS_ERR(osb->dc_task)) { | |
2231 | status = PTR_ERR(osb->dc_task); | |
2232 | osb->dc_task = NULL; | |
ccd979bd MF |
2233 | mlog_errno(status); |
2234 | goto bail; | |
2235 | } | |
2236 | ||
2237 | /* used by the dlm code to make message headers unique, each | |
2238 | * node in this domain must agree on this. */ | |
2239 | dlm_key = crc32_le(0, osb->uuid_str, strlen(osb->uuid_str)); | |
2240 | ||
2241 | /* for now, uuid == domain */ | |
2242 | dlm = dlm_register_domain(osb->uuid_str, dlm_key); | |
2243 | if (IS_ERR(dlm)) { | |
2244 | status = PTR_ERR(dlm); | |
2245 | mlog_errno(status); | |
2246 | goto bail; | |
2247 | } | |
2248 | ||
c271c5c2 SM |
2249 | dlm_register_eviction_cb(dlm, &osb->osb_eviction_cb); |
2250 | ||
2251 | local: | |
ccd979bd MF |
2252 | ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb); |
2253 | ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb); | |
2254 | ||
ccd979bd MF |
2255 | osb->dlm = dlm; |
2256 | ||
2257 | status = 0; | |
2258 | bail: | |
2259 | if (status < 0) { | |
2260 | ocfs2_dlm_shutdown_debug(osb); | |
34d024f8 MF |
2261 | if (osb->dc_task) |
2262 | kthread_stop(osb->dc_task); | |
ccd979bd MF |
2263 | } |
2264 | ||
2265 | mlog_exit(status); | |
2266 | return status; | |
2267 | } | |
2268 | ||
2269 | void ocfs2_dlm_shutdown(struct ocfs2_super *osb) | |
2270 | { | |
2271 | mlog_entry_void(); | |
2272 | ||
2273 | dlm_unregister_eviction_cb(&osb->osb_eviction_cb); | |
2274 | ||
2275 | ocfs2_drop_osb_locks(osb); | |
2276 | ||
34d024f8 MF |
2277 | if (osb->dc_task) { |
2278 | kthread_stop(osb->dc_task); | |
2279 | osb->dc_task = NULL; | |
ccd979bd MF |
2280 | } |
2281 | ||
2282 | ocfs2_lock_res_free(&osb->osb_super_lockres); | |
2283 | ocfs2_lock_res_free(&osb->osb_rename_lockres); | |
2284 | ||
2285 | dlm_unregister_domain(osb->dlm); | |
2286 | osb->dlm = NULL; | |
2287 | ||
2288 | ocfs2_dlm_shutdown_debug(osb); | |
2289 | ||
2290 | mlog_exit_void(); | |
2291 | } | |
2292 | ||
2a45f2d1 | 2293 | static void ocfs2_unlock_ast(void *opaque, enum dlm_status status) |
ccd979bd MF |
2294 | { |
2295 | struct ocfs2_lock_res *lockres = opaque; | |
2296 | unsigned long flags; | |
2297 | ||
2298 | mlog_entry_void(); | |
2299 | ||
2300 | mlog(0, "UNLOCK AST called on lock %s, action = %d\n", lockres->l_name, | |
2301 | lockres->l_unlock_action); | |
2302 | ||
2303 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2304 | /* We tried to cancel a convert request, but it was already | |
2305 | * granted. All we want to do here is clear our unlock | |
2306 | * state. The wake_up call done at the bottom is redundant | |
2307 | * (ocfs2_prepare_cancel_convert doesn't sleep on this) but doesn't | |
2308 | * hurt anything anyway */ | |
2309 | if (status == DLM_CANCELGRANT && | |
2310 | lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { | |
2311 | mlog(0, "Got cancelgrant for %s\n", lockres->l_name); | |
2312 | ||
2313 | /* We don't clear the busy flag in this case as it | |
2314 | * should have been cleared by the ast which the dlm | |
2315 | * has called. */ | |
2316 | goto complete_unlock; | |
2317 | } | |
2318 | ||
2319 | if (status != DLM_NORMAL) { | |
2320 | mlog(ML_ERROR, "Dlm passes status %d for lock %s, " | |
2321 | "unlock_action %d\n", status, lockres->l_name, | |
2322 | lockres->l_unlock_action); | |
2323 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2324 | return; | |
2325 | } | |
2326 | ||
2327 | switch(lockres->l_unlock_action) { | |
2328 | case OCFS2_UNLOCK_CANCEL_CONVERT: | |
2329 | mlog(0, "Cancel convert success for %s\n", lockres->l_name); | |
2330 | lockres->l_action = OCFS2_AST_INVALID; | |
2331 | break; | |
2332 | case OCFS2_UNLOCK_DROP_LOCK: | |
2333 | lockres->l_level = LKM_IVMODE; | |
2334 | break; | |
2335 | default: | |
2336 | BUG(); | |
2337 | } | |
2338 | ||
2339 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
2340 | complete_unlock: | |
2341 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
2342 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2343 | ||
2344 | wake_up(&lockres->l_event); | |
2345 | ||
2346 | mlog_exit_void(); | |
2347 | } | |
2348 | ||
ccd979bd | 2349 | static int ocfs2_drop_lock(struct ocfs2_super *osb, |
0d5dc6c2 | 2350 | struct ocfs2_lock_res *lockres) |
ccd979bd MF |
2351 | { |
2352 | enum dlm_status status; | |
2353 | unsigned long flags; | |
b80fc012 | 2354 | int lkm_flags = 0; |
ccd979bd MF |
2355 | |
2356 | /* We didn't get anywhere near actually using this lockres. */ | |
2357 | if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) | |
2358 | goto out; | |
2359 | ||
b80fc012 MF |
2360 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
2361 | lkm_flags |= LKM_VALBLK; | |
2362 | ||
ccd979bd MF |
2363 | spin_lock_irqsave(&lockres->l_lock, flags); |
2364 | ||
2365 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING), | |
2366 | "lockres %s, flags 0x%lx\n", | |
2367 | lockres->l_name, lockres->l_flags); | |
2368 | ||
2369 | while (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
2370 | mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = " | |
2371 | "%u, unlock_action = %u\n", | |
2372 | lockres->l_name, lockres->l_flags, lockres->l_action, | |
2373 | lockres->l_unlock_action); | |
2374 | ||
2375 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2376 | ||
2377 | /* XXX: Today we just wait on any busy | |
2378 | * locks... Perhaps we need to cancel converts in the | |
2379 | * future? */ | |
2380 | ocfs2_wait_on_busy_lock(lockres); | |
2381 | ||
2382 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2383 | } | |
2384 | ||
0d5dc6c2 MF |
2385 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) { |
2386 | if (lockres->l_flags & OCFS2_LOCK_ATTACHED && | |
2387 | lockres->l_level == LKM_EXMODE && | |
2388 | !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) | |
2389 | lockres->l_ops->set_lvb(lockres); | |
2390 | } | |
ccd979bd MF |
2391 | |
2392 | if (lockres->l_flags & OCFS2_LOCK_BUSY) | |
2393 | mlog(ML_ERROR, "destroying busy lock: \"%s\"\n", | |
2394 | lockres->l_name); | |
2395 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) | |
2396 | mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name); | |
2397 | ||
2398 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { | |
2399 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2400 | goto out; | |
2401 | } | |
2402 | ||
2403 | lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED); | |
2404 | ||
2405 | /* make sure we never get here while waiting for an ast to | |
2406 | * fire. */ | |
2407 | BUG_ON(lockres->l_action != OCFS2_AST_INVALID); | |
2408 | ||
2409 | /* is this necessary? */ | |
2410 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
2411 | lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK; | |
2412 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2413 | ||
2414 | mlog(0, "lock %s\n", lockres->l_name); | |
2415 | ||
b80fc012 | 2416 | status = dlmunlock(osb->dlm, &lockres->l_lksb, lkm_flags, |
2a45f2d1 | 2417 | ocfs2_unlock_ast, lockres); |
ccd979bd MF |
2418 | if (status != DLM_NORMAL) { |
2419 | ocfs2_log_dlm_error("dlmunlock", status, lockres); | |
2420 | mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags); | |
2421 | dlm_print_one_lock(lockres->l_lksb.lockid); | |
2422 | BUG(); | |
2423 | } | |
2424 | mlog(0, "lock %s, successfull return from dlmunlock\n", | |
2425 | lockres->l_name); | |
2426 | ||
2427 | ocfs2_wait_on_busy_lock(lockres); | |
2428 | out: | |
2429 | mlog_exit(0); | |
2430 | return 0; | |
2431 | } | |
2432 | ||
2433 | /* Mark the lockres as being dropped. It will no longer be | |
2434 | * queued if blocking, but we still may have to wait on it | |
34d024f8 | 2435 | * being dequeued from the downconvert thread before we can consider |
ccd979bd MF |
2436 | * it safe to drop. |
2437 | * | |
2438 | * You can *not* attempt to call cluster_lock on this lockres anymore. */ | |
2439 | void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres) | |
2440 | { | |
2441 | int status; | |
2442 | struct ocfs2_mask_waiter mw; | |
2443 | unsigned long flags; | |
2444 | ||
2445 | ocfs2_init_mask_waiter(&mw); | |
2446 | ||
2447 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2448 | lockres->l_flags |= OCFS2_LOCK_FREEING; | |
2449 | while (lockres->l_flags & OCFS2_LOCK_QUEUED) { | |
2450 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0); | |
2451 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2452 | ||
2453 | mlog(0, "Waiting on lockres %s\n", lockres->l_name); | |
2454 | ||
2455 | status = ocfs2_wait_for_mask(&mw); | |
2456 | if (status) | |
2457 | mlog_errno(status); | |
2458 | ||
2459 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2460 | } | |
2461 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2462 | } | |
2463 | ||
d680efe9 MF |
2464 | void ocfs2_simple_drop_lockres(struct ocfs2_super *osb, |
2465 | struct ocfs2_lock_res *lockres) | |
ccd979bd | 2466 | { |
d680efe9 | 2467 | int ret; |
ccd979bd | 2468 | |
d680efe9 | 2469 | ocfs2_mark_lockres_freeing(lockres); |
0d5dc6c2 | 2470 | ret = ocfs2_drop_lock(osb, lockres); |
d680efe9 MF |
2471 | if (ret) |
2472 | mlog_errno(ret); | |
2473 | } | |
ccd979bd | 2474 | |
d680efe9 MF |
2475 | static void ocfs2_drop_osb_locks(struct ocfs2_super *osb) |
2476 | { | |
2477 | ocfs2_simple_drop_lockres(osb, &osb->osb_super_lockres); | |
2478 | ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres); | |
ccd979bd MF |
2479 | } |
2480 | ||
ccd979bd MF |
2481 | int ocfs2_drop_inode_locks(struct inode *inode) |
2482 | { | |
2483 | int status, err; | |
ccd979bd MF |
2484 | |
2485 | mlog_entry_void(); | |
2486 | ||
2487 | /* No need to call ocfs2_mark_lockres_freeing here - | |
2488 | * ocfs2_clear_inode has done it for us. */ | |
2489 | ||
2490 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
50008630 | 2491 | &OCFS2_I(inode)->ip_open_lockres); |
ccd979bd MF |
2492 | if (err < 0) |
2493 | mlog_errno(err); | |
2494 | ||
2495 | status = err; | |
2496 | ||
2497 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
e63aecb6 | 2498 | &OCFS2_I(inode)->ip_inode_lockres); |
ccd979bd MF |
2499 | if (err < 0) |
2500 | mlog_errno(err); | |
2501 | if (err < 0 && !status) | |
2502 | status = err; | |
2503 | ||
2504 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
0d5dc6c2 | 2505 | &OCFS2_I(inode)->ip_rw_lockres); |
ccd979bd MF |
2506 | if (err < 0) |
2507 | mlog_errno(err); | |
2508 | if (err < 0 && !status) | |
2509 | status = err; | |
2510 | ||
2511 | mlog_exit(status); | |
2512 | return status; | |
2513 | } | |
2514 | ||
2515 | static void ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres, | |
2516 | int new_level) | |
2517 | { | |
2518 | assert_spin_locked(&lockres->l_lock); | |
2519 | ||
2520 | BUG_ON(lockres->l_blocking <= LKM_NLMODE); | |
2521 | ||
2522 | if (lockres->l_level <= new_level) { | |
2523 | mlog(ML_ERROR, "lockres->l_level (%u) <= new_level (%u)\n", | |
2524 | lockres->l_level, new_level); | |
2525 | BUG(); | |
2526 | } | |
2527 | ||
2528 | mlog(0, "lock %s, new_level = %d, l_blocking = %d\n", | |
2529 | lockres->l_name, new_level, lockres->l_blocking); | |
2530 | ||
2531 | lockres->l_action = OCFS2_AST_DOWNCONVERT; | |
2532 | lockres->l_requested = new_level; | |
2533 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
2534 | } | |
2535 | ||
2536 | static int ocfs2_downconvert_lock(struct ocfs2_super *osb, | |
2537 | struct ocfs2_lock_res *lockres, | |
2538 | int new_level, | |
2539 | int lvb) | |
2540 | { | |
2541 | int ret, dlm_flags = LKM_CONVERT; | |
2542 | enum dlm_status status; | |
2543 | ||
2544 | mlog_entry_void(); | |
2545 | ||
2546 | if (lvb) | |
2547 | dlm_flags |= LKM_VALBLK; | |
2548 | ||
2549 | status = dlmlock(osb->dlm, | |
2550 | new_level, | |
2551 | &lockres->l_lksb, | |
2552 | dlm_flags, | |
2553 | lockres->l_name, | |
f0681062 | 2554 | OCFS2_LOCK_ID_MAX_LEN - 1, |
e92d57df | 2555 | ocfs2_locking_ast, |
ccd979bd | 2556 | lockres, |
aa2623ad | 2557 | ocfs2_blocking_ast); |
ccd979bd MF |
2558 | if (status != DLM_NORMAL) { |
2559 | ocfs2_log_dlm_error("dlmlock", status, lockres); | |
2560 | ret = -EINVAL; | |
2561 | ocfs2_recover_from_dlm_error(lockres, 1); | |
2562 | goto bail; | |
2563 | } | |
2564 | ||
2565 | ret = 0; | |
2566 | bail: | |
2567 | mlog_exit(ret); | |
2568 | return ret; | |
2569 | } | |
2570 | ||
2571 | /* returns 1 when the caller should unlock and call dlmunlock */ | |
2572 | static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb, | |
2573 | struct ocfs2_lock_res *lockres) | |
2574 | { | |
2575 | assert_spin_locked(&lockres->l_lock); | |
2576 | ||
2577 | mlog_entry_void(); | |
2578 | mlog(0, "lock %s\n", lockres->l_name); | |
2579 | ||
2580 | if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { | |
2581 | /* If we're already trying to cancel a lock conversion | |
2582 | * then just drop the spinlock and allow the caller to | |
2583 | * requeue this lock. */ | |
2584 | ||
2585 | mlog(0, "Lockres %s, skip convert\n", lockres->l_name); | |
2586 | return 0; | |
2587 | } | |
2588 | ||
2589 | /* were we in a convert when we got the bast fire? */ | |
2590 | BUG_ON(lockres->l_action != OCFS2_AST_CONVERT && | |
2591 | lockres->l_action != OCFS2_AST_DOWNCONVERT); | |
2592 | /* set things up for the unlockast to know to just | |
2593 | * clear out the ast_action and unset busy, etc. */ | |
2594 | lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT; | |
2595 | ||
2596 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY), | |
2597 | "lock %s, invalid flags: 0x%lx\n", | |
2598 | lockres->l_name, lockres->l_flags); | |
2599 | ||
2600 | return 1; | |
2601 | } | |
2602 | ||
2603 | static int ocfs2_cancel_convert(struct ocfs2_super *osb, | |
2604 | struct ocfs2_lock_res *lockres) | |
2605 | { | |
2606 | int ret; | |
2607 | enum dlm_status status; | |
2608 | ||
2609 | mlog_entry_void(); | |
2610 | mlog(0, "lock %s\n", lockres->l_name); | |
2611 | ||
2612 | ret = 0; | |
2613 | status = dlmunlock(osb->dlm, | |
2614 | &lockres->l_lksb, | |
2615 | LKM_CANCEL, | |
2a45f2d1 | 2616 | ocfs2_unlock_ast, |
ccd979bd MF |
2617 | lockres); |
2618 | if (status != DLM_NORMAL) { | |
2619 | ocfs2_log_dlm_error("dlmunlock", status, lockres); | |
2620 | ret = -EINVAL; | |
2621 | ocfs2_recover_from_dlm_error(lockres, 0); | |
2622 | } | |
2623 | ||
2624 | mlog(0, "lock %s return from dlmunlock\n", lockres->l_name); | |
2625 | ||
ccd979bd MF |
2626 | mlog_exit(ret); |
2627 | return ret; | |
2628 | } | |
2629 | ||
b5e500e2 MF |
2630 | static int ocfs2_unblock_lock(struct ocfs2_super *osb, |
2631 | struct ocfs2_lock_res *lockres, | |
2632 | struct ocfs2_unblock_ctl *ctl) | |
ccd979bd MF |
2633 | { |
2634 | unsigned long flags; | |
2635 | int blocking; | |
2636 | int new_level; | |
2637 | int ret = 0; | |
5ef0d4ea | 2638 | int set_lvb = 0; |
ccd979bd MF |
2639 | |
2640 | mlog_entry_void(); | |
2641 | ||
2642 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2643 | ||
2644 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
2645 | ||
2646 | recheck: | |
2647 | if (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
d680efe9 | 2648 | ctl->requeue = 1; |
ccd979bd MF |
2649 | ret = ocfs2_prepare_cancel_convert(osb, lockres); |
2650 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2651 | if (ret) { | |
2652 | ret = ocfs2_cancel_convert(osb, lockres); | |
2653 | if (ret < 0) | |
2654 | mlog_errno(ret); | |
2655 | } | |
2656 | goto leave; | |
2657 | } | |
2658 | ||
2659 | /* if we're blocking an exclusive and we have *any* holders, | |
2660 | * then requeue. */ | |
2661 | if ((lockres->l_blocking == LKM_EXMODE) | |
f7fbfdd1 MF |
2662 | && (lockres->l_ex_holders || lockres->l_ro_holders)) |
2663 | goto leave_requeue; | |
ccd979bd MF |
2664 | |
2665 | /* If it's a PR we're blocking, then only | |
2666 | * requeue if we've got any EX holders */ | |
2667 | if (lockres->l_blocking == LKM_PRMODE && | |
f7fbfdd1 MF |
2668 | lockres->l_ex_holders) |
2669 | goto leave_requeue; | |
2670 | ||
2671 | /* | |
2672 | * Can we get a lock in this state if the holder counts are | |
2673 | * zero? The meta data unblock code used to check this. | |
2674 | */ | |
2675 | if ((lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) | |
2676 | && (lockres->l_flags & OCFS2_LOCK_REFRESHING)) | |
2677 | goto leave_requeue; | |
ccd979bd | 2678 | |
16d5b956 MF |
2679 | new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking); |
2680 | ||
2681 | if (lockres->l_ops->check_downconvert | |
2682 | && !lockres->l_ops->check_downconvert(lockres, new_level)) | |
2683 | goto leave_requeue; | |
2684 | ||
ccd979bd MF |
2685 | /* If we get here, then we know that there are no more |
2686 | * incompatible holders (and anyone asking for an incompatible | |
2687 | * lock is blocked). We can now downconvert the lock */ | |
cc567d89 | 2688 | if (!lockres->l_ops->downconvert_worker) |
ccd979bd MF |
2689 | goto downconvert; |
2690 | ||
2691 | /* Some lockres types want to do a bit of work before | |
2692 | * downconverting a lock. Allow that here. The worker function | |
2693 | * may sleep, so we save off a copy of what we're blocking as | |
2694 | * it may change while we're not holding the spin lock. */ | |
2695 | blocking = lockres->l_blocking; | |
2696 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2697 | ||
cc567d89 | 2698 | ctl->unblock_action = lockres->l_ops->downconvert_worker(lockres, blocking); |
d680efe9 MF |
2699 | |
2700 | if (ctl->unblock_action == UNBLOCK_STOP_POST) | |
2701 | goto leave; | |
ccd979bd MF |
2702 | |
2703 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2704 | if (blocking != lockres->l_blocking) { | |
2705 | /* If this changed underneath us, then we can't drop | |
2706 | * it just yet. */ | |
2707 | goto recheck; | |
2708 | } | |
2709 | ||
2710 | downconvert: | |
d680efe9 | 2711 | ctl->requeue = 0; |
ccd979bd | 2712 | |
5ef0d4ea MF |
2713 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) { |
2714 | if (lockres->l_level == LKM_EXMODE) | |
2715 | set_lvb = 1; | |
2716 | ||
2717 | /* | |
2718 | * We only set the lvb if the lock has been fully | |
2719 | * refreshed - otherwise we risk setting stale | |
2720 | * data. Otherwise, there's no need to actually clear | |
2721 | * out the lvb here as it's value is still valid. | |
2722 | */ | |
2723 | if (set_lvb && !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) | |
2724 | lockres->l_ops->set_lvb(lockres); | |
2725 | } | |
2726 | ||
ccd979bd MF |
2727 | ocfs2_prepare_downconvert(lockres, new_level); |
2728 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
5ef0d4ea | 2729 | ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb); |
ccd979bd MF |
2730 | leave: |
2731 | mlog_exit(ret); | |
2732 | return ret; | |
f7fbfdd1 MF |
2733 | |
2734 | leave_requeue: | |
2735 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2736 | ctl->requeue = 1; | |
2737 | ||
2738 | mlog_exit(0); | |
2739 | return 0; | |
ccd979bd MF |
2740 | } |
2741 | ||
d680efe9 MF |
2742 | static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, |
2743 | int blocking) | |
ccd979bd MF |
2744 | { |
2745 | struct inode *inode; | |
2746 | struct address_space *mapping; | |
2747 | ||
ccd979bd MF |
2748 | inode = ocfs2_lock_res_inode(lockres); |
2749 | mapping = inode->i_mapping; | |
2750 | ||
f1f54068 MF |
2751 | if (S_ISREG(inode->i_mode)) |
2752 | goto out; | |
2753 | ||
7f4a2a97 MF |
2754 | /* |
2755 | * We need this before the filemap_fdatawrite() so that it can | |
2756 | * transfer the dirty bit from the PTE to the | |
2757 | * page. Unfortunately this means that even for EX->PR | |
2758 | * downconverts, we'll lose our mappings and have to build | |
2759 | * them up again. | |
2760 | */ | |
2761 | unmap_mapping_range(mapping, 0, 0, 0); | |
2762 | ||
ccd979bd | 2763 | if (filemap_fdatawrite(mapping)) { |
b0697053 MF |
2764 | mlog(ML_ERROR, "Could not sync inode %llu for downconvert!", |
2765 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
ccd979bd MF |
2766 | } |
2767 | sync_mapping_buffers(mapping); | |
2768 | if (blocking == LKM_EXMODE) { | |
2769 | truncate_inode_pages(mapping, 0); | |
ccd979bd MF |
2770 | } else { |
2771 | /* We only need to wait on the I/O if we're not also | |
2772 | * truncating pages because truncate_inode_pages waits | |
2773 | * for us above. We don't truncate pages if we're | |
2774 | * blocking anything < EXMODE because we want to keep | |
2775 | * them around in that case. */ | |
2776 | filemap_fdatawait(mapping); | |
2777 | } | |
2778 | ||
f1f54068 | 2779 | out: |
d680efe9 | 2780 | return UNBLOCK_CONTINUE; |
ccd979bd MF |
2781 | } |
2782 | ||
810d5aeb MF |
2783 | static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres, |
2784 | int new_level) | |
2785 | { | |
2786 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
2787 | int checkpointed = ocfs2_inode_fully_checkpointed(inode); | |
2788 | ||
2789 | BUG_ON(new_level != LKM_NLMODE && new_level != LKM_PRMODE); | |
2790 | BUG_ON(lockres->l_level != LKM_EXMODE && !checkpointed); | |
2791 | ||
2792 | if (checkpointed) | |
2793 | return 1; | |
2794 | ||
2795 | ocfs2_start_checkpoint(OCFS2_SB(inode->i_sb)); | |
2796 | return 0; | |
2797 | } | |
2798 | ||
2799 | static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres) | |
2800 | { | |
2801 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
2802 | ||
2803 | __ocfs2_stuff_meta_lvb(inode); | |
2804 | } | |
2805 | ||
d680efe9 MF |
2806 | /* |
2807 | * Does the final reference drop on our dentry lock. Right now this | |
34d024f8 | 2808 | * happens in the downconvert thread, but we could choose to simplify the |
d680efe9 MF |
2809 | * dlmglue API and push these off to the ocfs2_wq in the future. |
2810 | */ | |
2811 | static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, | |
2812 | struct ocfs2_lock_res *lockres) | |
2813 | { | |
2814 | struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); | |
2815 | ocfs2_dentry_lock_put(osb, dl); | |
2816 | } | |
2817 | ||
2818 | /* | |
2819 | * d_delete() matching dentries before the lock downconvert. | |
2820 | * | |
2821 | * At this point, any process waiting to destroy the | |
2822 | * dentry_lock due to last ref count is stopped by the | |
2823 | * OCFS2_LOCK_QUEUED flag. | |
2824 | * | |
2825 | * We have two potential problems | |
2826 | * | |
2827 | * 1) If we do the last reference drop on our dentry_lock (via dput) | |
2828 | * we'll wind up in ocfs2_release_dentry_lock(), waiting on | |
2829 | * the downconvert to finish. Instead we take an elevated | |
2830 | * reference and push the drop until after we've completed our | |
2831 | * unblock processing. | |
2832 | * | |
2833 | * 2) There might be another process with a final reference, | |
2834 | * waiting on us to finish processing. If this is the case, we | |
2835 | * detect it and exit out - there's no more dentries anyway. | |
2836 | */ | |
2837 | static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, | |
2838 | int blocking) | |
2839 | { | |
2840 | struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); | |
2841 | struct ocfs2_inode_info *oi = OCFS2_I(dl->dl_inode); | |
2842 | struct dentry *dentry; | |
2843 | unsigned long flags; | |
2844 | int extra_ref = 0; | |
2845 | ||
2846 | /* | |
2847 | * This node is blocking another node from getting a read | |
2848 | * lock. This happens when we've renamed within a | |
2849 | * directory. We've forced the other nodes to d_delete(), but | |
2850 | * we never actually dropped our lock because it's still | |
2851 | * valid. The downconvert code will retain a PR for this node, | |
2852 | * so there's no further work to do. | |
2853 | */ | |
2854 | if (blocking == LKM_PRMODE) | |
2855 | return UNBLOCK_CONTINUE; | |
2856 | ||
2857 | /* | |
2858 | * Mark this inode as potentially orphaned. The code in | |
2859 | * ocfs2_delete_inode() will figure out whether it actually | |
2860 | * needs to be freed or not. | |
2861 | */ | |
2862 | spin_lock(&oi->ip_lock); | |
2863 | oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED; | |
2864 | spin_unlock(&oi->ip_lock); | |
2865 | ||
2866 | /* | |
2867 | * Yuck. We need to make sure however that the check of | |
2868 | * OCFS2_LOCK_FREEING and the extra reference are atomic with | |
2869 | * respect to a reference decrement or the setting of that | |
2870 | * flag. | |
2871 | */ | |
2872 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2873 | spin_lock(&dentry_attach_lock); | |
2874 | if (!(lockres->l_flags & OCFS2_LOCK_FREEING) | |
2875 | && dl->dl_count) { | |
2876 | dl->dl_count++; | |
2877 | extra_ref = 1; | |
2878 | } | |
2879 | spin_unlock(&dentry_attach_lock); | |
2880 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2881 | ||
2882 | mlog(0, "extra_ref = %d\n", extra_ref); | |
2883 | ||
2884 | /* | |
2885 | * We have a process waiting on us in ocfs2_dentry_iput(), | |
2886 | * which means we can't have any more outstanding | |
2887 | * aliases. There's no need to do any more work. | |
2888 | */ | |
2889 | if (!extra_ref) | |
2890 | return UNBLOCK_CONTINUE; | |
2891 | ||
2892 | spin_lock(&dentry_attach_lock); | |
2893 | while (1) { | |
2894 | dentry = ocfs2_find_local_alias(dl->dl_inode, | |
2895 | dl->dl_parent_blkno, 1); | |
2896 | if (!dentry) | |
2897 | break; | |
2898 | spin_unlock(&dentry_attach_lock); | |
2899 | ||
2900 | mlog(0, "d_delete(%.*s);\n", dentry->d_name.len, | |
2901 | dentry->d_name.name); | |
2902 | ||
2903 | /* | |
2904 | * The following dcache calls may do an | |
2905 | * iput(). Normally we don't want that from the | |
2906 | * downconverting thread, but in this case it's ok | |
2907 | * because the requesting node already has an | |
2908 | * exclusive lock on the inode, so it can't be queued | |
2909 | * for a downconvert. | |
2910 | */ | |
2911 | d_delete(dentry); | |
2912 | dput(dentry); | |
2913 | ||
2914 | spin_lock(&dentry_attach_lock); | |
2915 | } | |
2916 | spin_unlock(&dentry_attach_lock); | |
2917 | ||
2918 | /* | |
2919 | * If we are the last holder of this dentry lock, there is no | |
2920 | * reason to downconvert so skip straight to the unlock. | |
2921 | */ | |
2922 | if (dl->dl_count == 1) | |
2923 | return UNBLOCK_STOP_POST; | |
2924 | ||
2925 | return UNBLOCK_CONTINUE_POST; | |
2926 | } | |
2927 | ||
ccd979bd MF |
2928 | void ocfs2_process_blocked_lock(struct ocfs2_super *osb, |
2929 | struct ocfs2_lock_res *lockres) | |
2930 | { | |
2931 | int status; | |
d680efe9 | 2932 | struct ocfs2_unblock_ctl ctl = {0, 0,}; |
ccd979bd MF |
2933 | unsigned long flags; |
2934 | ||
2935 | /* Our reference to the lockres in this function can be | |
2936 | * considered valid until we remove the OCFS2_LOCK_QUEUED | |
2937 | * flag. */ | |
2938 | ||
2939 | mlog_entry_void(); | |
2940 | ||
2941 | BUG_ON(!lockres); | |
2942 | BUG_ON(!lockres->l_ops); | |
ccd979bd MF |
2943 | |
2944 | mlog(0, "lockres %s blocked.\n", lockres->l_name); | |
2945 | ||
2946 | /* Detect whether a lock has been marked as going away while | |
34d024f8 | 2947 | * the downconvert thread was processing other things. A lock can |
ccd979bd MF |
2948 | * still be marked with OCFS2_LOCK_FREEING after this check, |
2949 | * but short circuiting here will still save us some | |
2950 | * performance. */ | |
2951 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2952 | if (lockres->l_flags & OCFS2_LOCK_FREEING) | |
2953 | goto unqueue; | |
2954 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2955 | ||
b5e500e2 | 2956 | status = ocfs2_unblock_lock(osb, lockres, &ctl); |
ccd979bd MF |
2957 | if (status < 0) |
2958 | mlog_errno(status); | |
2959 | ||
2960 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2961 | unqueue: | |
d680efe9 | 2962 | if (lockres->l_flags & OCFS2_LOCK_FREEING || !ctl.requeue) { |
ccd979bd MF |
2963 | lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED); |
2964 | } else | |
2965 | ocfs2_schedule_blocked_lock(osb, lockres); | |
2966 | ||
2967 | mlog(0, "lockres %s, requeue = %s.\n", lockres->l_name, | |
d680efe9 | 2968 | ctl.requeue ? "yes" : "no"); |
ccd979bd MF |
2969 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
2970 | ||
d680efe9 MF |
2971 | if (ctl.unblock_action != UNBLOCK_CONTINUE |
2972 | && lockres->l_ops->post_unlock) | |
2973 | lockres->l_ops->post_unlock(osb, lockres); | |
2974 | ||
ccd979bd MF |
2975 | mlog_exit_void(); |
2976 | } | |
2977 | ||
2978 | static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, | |
2979 | struct ocfs2_lock_res *lockres) | |
2980 | { | |
2981 | mlog_entry_void(); | |
2982 | ||
2983 | assert_spin_locked(&lockres->l_lock); | |
2984 | ||
2985 | if (lockres->l_flags & OCFS2_LOCK_FREEING) { | |
2986 | /* Do not schedule a lock for downconvert when it's on | |
2987 | * the way to destruction - any nodes wanting access | |
2988 | * to the resource will get it soon. */ | |
2989 | mlog(0, "Lockres %s won't be scheduled: flags 0x%lx\n", | |
2990 | lockres->l_name, lockres->l_flags); | |
2991 | return; | |
2992 | } | |
2993 | ||
2994 | lockres_or_flags(lockres, OCFS2_LOCK_QUEUED); | |
2995 | ||
34d024f8 | 2996 | spin_lock(&osb->dc_task_lock); |
ccd979bd MF |
2997 | if (list_empty(&lockres->l_blocked_list)) { |
2998 | list_add_tail(&lockres->l_blocked_list, | |
2999 | &osb->blocked_lock_list); | |
3000 | osb->blocked_lock_count++; | |
3001 | } | |
34d024f8 | 3002 | spin_unlock(&osb->dc_task_lock); |
ccd979bd MF |
3003 | |
3004 | mlog_exit_void(); | |
3005 | } | |
34d024f8 MF |
3006 | |
3007 | static void ocfs2_downconvert_thread_do_work(struct ocfs2_super *osb) | |
3008 | { | |
3009 | unsigned long processed; | |
3010 | struct ocfs2_lock_res *lockres; | |
3011 | ||
3012 | mlog_entry_void(); | |
3013 | ||
3014 | spin_lock(&osb->dc_task_lock); | |
3015 | /* grab this early so we know to try again if a state change and | |
3016 | * wake happens part-way through our work */ | |
3017 | osb->dc_work_sequence = osb->dc_wake_sequence; | |
3018 | ||
3019 | processed = osb->blocked_lock_count; | |
3020 | while (processed) { | |
3021 | BUG_ON(list_empty(&osb->blocked_lock_list)); | |
3022 | ||
3023 | lockres = list_entry(osb->blocked_lock_list.next, | |
3024 | struct ocfs2_lock_res, l_blocked_list); | |
3025 | list_del_init(&lockres->l_blocked_list); | |
3026 | osb->blocked_lock_count--; | |
3027 | spin_unlock(&osb->dc_task_lock); | |
3028 | ||
3029 | BUG_ON(!processed); | |
3030 | processed--; | |
3031 | ||
3032 | ocfs2_process_blocked_lock(osb, lockres); | |
3033 | ||
3034 | spin_lock(&osb->dc_task_lock); | |
3035 | } | |
3036 | spin_unlock(&osb->dc_task_lock); | |
3037 | ||
3038 | mlog_exit_void(); | |
3039 | } | |
3040 | ||
3041 | static int ocfs2_downconvert_thread_lists_empty(struct ocfs2_super *osb) | |
3042 | { | |
3043 | int empty = 0; | |
3044 | ||
3045 | spin_lock(&osb->dc_task_lock); | |
3046 | if (list_empty(&osb->blocked_lock_list)) | |
3047 | empty = 1; | |
3048 | ||
3049 | spin_unlock(&osb->dc_task_lock); | |
3050 | return empty; | |
3051 | } | |
3052 | ||
3053 | static int ocfs2_downconvert_thread_should_wake(struct ocfs2_super *osb) | |
3054 | { | |
3055 | int should_wake = 0; | |
3056 | ||
3057 | spin_lock(&osb->dc_task_lock); | |
3058 | if (osb->dc_work_sequence != osb->dc_wake_sequence) | |
3059 | should_wake = 1; | |
3060 | spin_unlock(&osb->dc_task_lock); | |
3061 | ||
3062 | return should_wake; | |
3063 | } | |
3064 | ||
3065 | int ocfs2_downconvert_thread(void *arg) | |
3066 | { | |
3067 | int status = 0; | |
3068 | struct ocfs2_super *osb = arg; | |
3069 | ||
3070 | /* only quit once we've been asked to stop and there is no more | |
3071 | * work available */ | |
3072 | while (!(kthread_should_stop() && | |
3073 | ocfs2_downconvert_thread_lists_empty(osb))) { | |
3074 | ||
3075 | wait_event_interruptible(osb->dc_event, | |
3076 | ocfs2_downconvert_thread_should_wake(osb) || | |
3077 | kthread_should_stop()); | |
3078 | ||
3079 | mlog(0, "downconvert_thread: awoken\n"); | |
3080 | ||
3081 | ocfs2_downconvert_thread_do_work(osb); | |
3082 | } | |
3083 | ||
3084 | osb->dc_task = NULL; | |
3085 | return status; | |
3086 | } | |
3087 | ||
3088 | void ocfs2_wake_downconvert_thread(struct ocfs2_super *osb) | |
3089 | { | |
3090 | spin_lock(&osb->dc_task_lock); | |
3091 | /* make sure the voting thread gets a swipe at whatever changes | |
3092 | * the caller may have made to the voting state */ | |
3093 | osb->dc_wake_sequence++; | |
3094 | spin_unlock(&osb->dc_task_lock); | |
3095 | wake_up(&osb->dc_event); | |
3096 | } |