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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" | |
d24fbcda | 46 | #include "ocfs2_lockingver.h" |
ccd979bd MF |
47 | |
48 | #include "alloc.h" | |
d680efe9 | 49 | #include "dcache.h" |
ccd979bd MF |
50 | #include "dlmglue.h" |
51 | #include "extent_map.h" | |
7f1a37e3 | 52 | #include "file.h" |
ccd979bd MF |
53 | #include "heartbeat.h" |
54 | #include "inode.h" | |
55 | #include "journal.h" | |
56 | #include "slot_map.h" | |
57 | #include "super.h" | |
58 | #include "uptodate.h" | |
ccd979bd MF |
59 | |
60 | #include "buffer_head_io.h" | |
61 | ||
62 | struct ocfs2_mask_waiter { | |
63 | struct list_head mw_item; | |
64 | int mw_status; | |
65 | struct completion mw_complete; | |
66 | unsigned long mw_mask; | |
67 | unsigned long mw_goal; | |
68 | }; | |
69 | ||
54a7e755 MF |
70 | static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres); |
71 | static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres); | |
cf8e06f1 | 72 | static struct ocfs2_super *ocfs2_get_file_osb(struct ocfs2_lock_res *lockres); |
ccd979bd | 73 | |
d680efe9 | 74 | /* |
cc567d89 | 75 | * Return value from ->downconvert_worker functions. |
d680efe9 | 76 | * |
b5e500e2 | 77 | * These control the precise actions of ocfs2_unblock_lock() |
d680efe9 MF |
78 | * and ocfs2_process_blocked_lock() |
79 | * | |
80 | */ | |
81 | enum ocfs2_unblock_action { | |
82 | UNBLOCK_CONTINUE = 0, /* Continue downconvert */ | |
83 | UNBLOCK_CONTINUE_POST = 1, /* Continue downconvert, fire | |
84 | * ->post_unlock callback */ | |
85 | UNBLOCK_STOP_POST = 2, /* Do not downconvert, fire | |
86 | * ->post_unlock() callback. */ | |
87 | }; | |
88 | ||
89 | struct ocfs2_unblock_ctl { | |
90 | int requeue; | |
91 | enum ocfs2_unblock_action unblock_action; | |
92 | }; | |
93 | ||
810d5aeb MF |
94 | static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres, |
95 | int new_level); | |
96 | static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres); | |
97 | ||
cc567d89 MF |
98 | static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, |
99 | int blocking); | |
100 | ||
cc567d89 MF |
101 | static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, |
102 | int blocking); | |
d680efe9 MF |
103 | |
104 | static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, | |
105 | struct ocfs2_lock_res *lockres); | |
ccd979bd | 106 | |
6cb129f5 AB |
107 | |
108 | #define mlog_meta_lvb(__level, __lockres) ocfs2_dump_meta_lvb_info(__level, __PRETTY_FUNCTION__, __LINE__, __lockres) | |
109 | ||
110 | /* This aids in debugging situations where a bad LVB might be involved. */ | |
111 | static void ocfs2_dump_meta_lvb_info(u64 level, | |
112 | const char *function, | |
113 | unsigned int line, | |
114 | struct ocfs2_lock_res *lockres) | |
115 | { | |
116 | struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; | |
117 | ||
118 | mlog(level, "LVB information for %s (called from %s:%u):\n", | |
119 | lockres->l_name, function, line); | |
120 | mlog(level, "version: %u, clusters: %u, generation: 0x%x\n", | |
121 | lvb->lvb_version, be32_to_cpu(lvb->lvb_iclusters), | |
122 | be32_to_cpu(lvb->lvb_igeneration)); | |
123 | mlog(level, "size: %llu, uid %u, gid %u, mode 0x%x\n", | |
124 | (unsigned long long)be64_to_cpu(lvb->lvb_isize), | |
125 | be32_to_cpu(lvb->lvb_iuid), be32_to_cpu(lvb->lvb_igid), | |
126 | be16_to_cpu(lvb->lvb_imode)); | |
127 | mlog(level, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, " | |
128 | "mtime_packed 0x%llx iattr 0x%x\n", be16_to_cpu(lvb->lvb_inlink), | |
129 | (long long)be64_to_cpu(lvb->lvb_iatime_packed), | |
130 | (long long)be64_to_cpu(lvb->lvb_ictime_packed), | |
131 | (long long)be64_to_cpu(lvb->lvb_imtime_packed), | |
132 | be32_to_cpu(lvb->lvb_iattr)); | |
133 | } | |
134 | ||
135 | ||
f625c979 MF |
136 | /* |
137 | * OCFS2 Lock Resource Operations | |
138 | * | |
139 | * These fine tune the behavior of the generic dlmglue locking infrastructure. | |
0d5dc6c2 MF |
140 | * |
141 | * The most basic of lock types can point ->l_priv to their respective | |
142 | * struct ocfs2_super and allow the default actions to manage things. | |
143 | * | |
144 | * Right now, each lock type also needs to implement an init function, | |
145 | * and trivial lock/unlock wrappers. ocfs2_simple_drop_lockres() | |
146 | * should be called when the lock is no longer needed (i.e., object | |
147 | * destruction time). | |
f625c979 | 148 | */ |
ccd979bd | 149 | struct ocfs2_lock_res_ops { |
54a7e755 MF |
150 | /* |
151 | * Translate an ocfs2_lock_res * into an ocfs2_super *. Define | |
152 | * this callback if ->l_priv is not an ocfs2_super pointer | |
153 | */ | |
154 | struct ocfs2_super * (*get_osb)(struct ocfs2_lock_res *); | |
b5e500e2 | 155 | |
0d5dc6c2 | 156 | /* |
34d024f8 MF |
157 | * Optionally called in the downconvert thread after a |
158 | * successful downconvert. The lockres will not be referenced | |
159 | * after this callback is called, so it is safe to free | |
160 | * memory, etc. | |
0d5dc6c2 MF |
161 | * |
162 | * The exact semantics of when this is called are controlled | |
163 | * by ->downconvert_worker() | |
164 | */ | |
d680efe9 | 165 | void (*post_unlock)(struct ocfs2_super *, struct ocfs2_lock_res *); |
f625c979 | 166 | |
16d5b956 MF |
167 | /* |
168 | * Allow a lock type to add checks to determine whether it is | |
169 | * safe to downconvert a lock. Return 0 to re-queue the | |
170 | * downconvert at a later time, nonzero to continue. | |
171 | * | |
172 | * For most locks, the default checks that there are no | |
173 | * incompatible holders are sufficient. | |
174 | * | |
175 | * Called with the lockres spinlock held. | |
176 | */ | |
177 | int (*check_downconvert)(struct ocfs2_lock_res *, int); | |
178 | ||
5ef0d4ea MF |
179 | /* |
180 | * Allows a lock type to populate the lock value block. This | |
181 | * is called on downconvert, and when we drop a lock. | |
182 | * | |
183 | * Locks that want to use this should set LOCK_TYPE_USES_LVB | |
184 | * in the flags field. | |
185 | * | |
186 | * Called with the lockres spinlock held. | |
187 | */ | |
188 | void (*set_lvb)(struct ocfs2_lock_res *); | |
189 | ||
cc567d89 MF |
190 | /* |
191 | * Called from the downconvert thread when it is determined | |
192 | * that a lock will be downconverted. This is called without | |
193 | * any locks held so the function can do work that might | |
194 | * schedule (syncing out data, etc). | |
195 | * | |
196 | * This should return any one of the ocfs2_unblock_action | |
197 | * values, depending on what it wants the thread to do. | |
198 | */ | |
199 | int (*downconvert_worker)(struct ocfs2_lock_res *, int); | |
200 | ||
f625c979 MF |
201 | /* |
202 | * LOCK_TYPE_* flags which describe the specific requirements | |
203 | * of a lock type. Descriptions of each individual flag follow. | |
204 | */ | |
205 | int flags; | |
ccd979bd MF |
206 | }; |
207 | ||
f625c979 MF |
208 | /* |
209 | * Some locks want to "refresh" potentially stale data when a | |
210 | * meaningful (PRMODE or EXMODE) lock level is first obtained. If this | |
211 | * flag is set, the OCFS2_LOCK_NEEDS_REFRESH flag will be set on the | |
212 | * individual lockres l_flags member from the ast function. It is | |
213 | * expected that the locking wrapper will clear the | |
214 | * OCFS2_LOCK_NEEDS_REFRESH flag when done. | |
215 | */ | |
216 | #define LOCK_TYPE_REQUIRES_REFRESH 0x1 | |
217 | ||
b80fc012 | 218 | /* |
5ef0d4ea MF |
219 | * Indicate that a lock type makes use of the lock value block. The |
220 | * ->set_lvb lock type callback must be defined. | |
b80fc012 MF |
221 | */ |
222 | #define LOCK_TYPE_USES_LVB 0x2 | |
223 | ||
ccd979bd | 224 | static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = { |
54a7e755 | 225 | .get_osb = ocfs2_get_inode_osb, |
f625c979 | 226 | .flags = 0, |
ccd979bd MF |
227 | }; |
228 | ||
e63aecb6 | 229 | static struct ocfs2_lock_res_ops ocfs2_inode_inode_lops = { |
54a7e755 | 230 | .get_osb = ocfs2_get_inode_osb, |
810d5aeb MF |
231 | .check_downconvert = ocfs2_check_meta_downconvert, |
232 | .set_lvb = ocfs2_set_meta_lvb, | |
f1f54068 | 233 | .downconvert_worker = ocfs2_data_convert_worker, |
b80fc012 | 234 | .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB, |
ccd979bd MF |
235 | }; |
236 | ||
ccd979bd | 237 | static struct ocfs2_lock_res_ops ocfs2_super_lops = { |
f625c979 | 238 | .flags = LOCK_TYPE_REQUIRES_REFRESH, |
ccd979bd MF |
239 | }; |
240 | ||
241 | static struct ocfs2_lock_res_ops ocfs2_rename_lops = { | |
f625c979 | 242 | .flags = 0, |
ccd979bd MF |
243 | }; |
244 | ||
d680efe9 | 245 | static struct ocfs2_lock_res_ops ocfs2_dentry_lops = { |
54a7e755 | 246 | .get_osb = ocfs2_get_dentry_osb, |
d680efe9 | 247 | .post_unlock = ocfs2_dentry_post_unlock, |
cc567d89 | 248 | .downconvert_worker = ocfs2_dentry_convert_worker, |
f625c979 | 249 | .flags = 0, |
d680efe9 MF |
250 | }; |
251 | ||
50008630 TY |
252 | static struct ocfs2_lock_res_ops ocfs2_inode_open_lops = { |
253 | .get_osb = ocfs2_get_inode_osb, | |
254 | .flags = 0, | |
255 | }; | |
256 | ||
cf8e06f1 MF |
257 | static struct ocfs2_lock_res_ops ocfs2_flock_lops = { |
258 | .get_osb = ocfs2_get_file_osb, | |
259 | .flags = 0, | |
260 | }; | |
261 | ||
d24fbcda JB |
262 | /* |
263 | * This is the filesystem locking protocol version. | |
264 | * | |
265 | * Whenever the filesystem does new things with locks (adds or removes a | |
266 | * lock, orders them differently, does different things underneath a lock), | |
267 | * the version must be changed. The protocol is negotiated when joining | |
268 | * the dlm domain. A node may join the domain if its major version is | |
269 | * identical to all other nodes and its minor version is greater than | |
270 | * or equal to all other nodes. When its minor version is greater than | |
271 | * the other nodes, it will run at the minor version specified by the | |
272 | * other nodes. | |
273 | * | |
274 | * If a locking change is made that will not be compatible with older | |
275 | * versions, the major number must be increased and the minor version set | |
276 | * to zero. If a change merely adds a behavior that can be disabled when | |
277 | * speaking to older versions, the minor version must be increased. If a | |
278 | * change adds a fully backwards compatible change (eg, LVB changes that | |
279 | * are just ignored by older versions), the version does not need to be | |
280 | * updated. | |
281 | */ | |
282 | const struct dlm_protocol_version ocfs2_locking_protocol = { | |
283 | .pv_major = OCFS2_LOCKING_PROTOCOL_MAJOR, | |
284 | .pv_minor = OCFS2_LOCKING_PROTOCOL_MINOR, | |
285 | }; | |
286 | ||
ccd979bd MF |
287 | static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres) |
288 | { | |
289 | return lockres->l_type == OCFS2_LOCK_TYPE_META || | |
50008630 TY |
290 | lockres->l_type == OCFS2_LOCK_TYPE_RW || |
291 | lockres->l_type == OCFS2_LOCK_TYPE_OPEN; | |
ccd979bd MF |
292 | } |
293 | ||
ccd979bd MF |
294 | static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres) |
295 | { | |
296 | BUG_ON(!ocfs2_is_inode_lock(lockres)); | |
297 | ||
298 | return (struct inode *) lockres->l_priv; | |
299 | } | |
300 | ||
d680efe9 MF |
301 | static inline struct ocfs2_dentry_lock *ocfs2_lock_res_dl(struct ocfs2_lock_res *lockres) |
302 | { | |
303 | BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_DENTRY); | |
304 | ||
305 | return (struct ocfs2_dentry_lock *)lockres->l_priv; | |
306 | } | |
307 | ||
54a7e755 MF |
308 | static inline struct ocfs2_super *ocfs2_get_lockres_osb(struct ocfs2_lock_res *lockres) |
309 | { | |
310 | if (lockres->l_ops->get_osb) | |
311 | return lockres->l_ops->get_osb(lockres); | |
312 | ||
313 | return (struct ocfs2_super *)lockres->l_priv; | |
314 | } | |
315 | ||
ccd979bd MF |
316 | static int ocfs2_lock_create(struct ocfs2_super *osb, |
317 | struct ocfs2_lock_res *lockres, | |
318 | int level, | |
319 | int dlm_flags); | |
320 | static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, | |
321 | int wanted); | |
322 | static void ocfs2_cluster_unlock(struct ocfs2_super *osb, | |
323 | struct ocfs2_lock_res *lockres, | |
324 | int level); | |
325 | static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres); | |
326 | static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres); | |
327 | static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres); | |
328 | static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, int level); | |
329 | static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, | |
330 | struct ocfs2_lock_res *lockres); | |
331 | static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, | |
332 | int convert); | |
333 | #define ocfs2_log_dlm_error(_func, _stat, _lockres) do { \ | |
334 | mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \ | |
335 | "resource %s: %s\n", dlm_errname(_stat), _func, \ | |
336 | _lockres->l_name, dlm_errmsg(_stat)); \ | |
337 | } while (0) | |
34d024f8 MF |
338 | static int ocfs2_downconvert_thread(void *arg); |
339 | static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb, | |
340 | struct ocfs2_lock_res *lockres); | |
e63aecb6 | 341 | static int ocfs2_inode_lock_update(struct inode *inode, |
ccd979bd MF |
342 | struct buffer_head **bh); |
343 | static void ocfs2_drop_osb_locks(struct ocfs2_super *osb); | |
344 | static inline int ocfs2_highest_compat_lock_level(int level); | |
cf8e06f1 MF |
345 | static void ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres, |
346 | int new_level); | |
347 | static int ocfs2_downconvert_lock(struct ocfs2_super *osb, | |
348 | struct ocfs2_lock_res *lockres, | |
349 | int new_level, | |
350 | int lvb); | |
351 | static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb, | |
352 | struct ocfs2_lock_res *lockres); | |
353 | static int ocfs2_cancel_convert(struct ocfs2_super *osb, | |
354 | struct ocfs2_lock_res *lockres); | |
355 | ||
ccd979bd | 356 | |
ccd979bd MF |
357 | static void ocfs2_build_lock_name(enum ocfs2_lock_type type, |
358 | u64 blkno, | |
359 | u32 generation, | |
360 | char *name) | |
361 | { | |
362 | int len; | |
363 | ||
364 | mlog_entry_void(); | |
365 | ||
366 | BUG_ON(type >= OCFS2_NUM_LOCK_TYPES); | |
367 | ||
b0697053 MF |
368 | len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016llx%08x", |
369 | ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD, | |
370 | (long long)blkno, generation); | |
ccd979bd MF |
371 | |
372 | BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1)); | |
373 | ||
374 | mlog(0, "built lock resource with name: %s\n", name); | |
375 | ||
376 | mlog_exit_void(); | |
377 | } | |
378 | ||
34af946a | 379 | static DEFINE_SPINLOCK(ocfs2_dlm_tracking_lock); |
ccd979bd MF |
380 | |
381 | static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res, | |
382 | struct ocfs2_dlm_debug *dlm_debug) | |
383 | { | |
384 | mlog(0, "Add tracking for lockres %s\n", res->l_name); | |
385 | ||
386 | spin_lock(&ocfs2_dlm_tracking_lock); | |
387 | list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking); | |
388 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
389 | } | |
390 | ||
391 | static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res) | |
392 | { | |
393 | spin_lock(&ocfs2_dlm_tracking_lock); | |
394 | if (!list_empty(&res->l_debug_list)) | |
395 | list_del_init(&res->l_debug_list); | |
396 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
397 | } | |
398 | ||
399 | static void ocfs2_lock_res_init_common(struct ocfs2_super *osb, | |
400 | struct ocfs2_lock_res *res, | |
401 | enum ocfs2_lock_type type, | |
ccd979bd MF |
402 | struct ocfs2_lock_res_ops *ops, |
403 | void *priv) | |
404 | { | |
ccd979bd MF |
405 | res->l_type = type; |
406 | res->l_ops = ops; | |
407 | res->l_priv = priv; | |
408 | ||
409 | res->l_level = LKM_IVMODE; | |
410 | res->l_requested = LKM_IVMODE; | |
411 | res->l_blocking = LKM_IVMODE; | |
412 | res->l_action = OCFS2_AST_INVALID; | |
413 | res->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
414 | ||
415 | res->l_flags = OCFS2_LOCK_INITIALIZED; | |
416 | ||
417 | ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug); | |
418 | } | |
419 | ||
420 | void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res) | |
421 | { | |
422 | /* This also clears out the lock status block */ | |
423 | memset(res, 0, sizeof(struct ocfs2_lock_res)); | |
424 | spin_lock_init(&res->l_lock); | |
425 | init_waitqueue_head(&res->l_event); | |
426 | INIT_LIST_HEAD(&res->l_blocked_list); | |
427 | INIT_LIST_HEAD(&res->l_mask_waiters); | |
428 | } | |
429 | ||
430 | void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res, | |
431 | enum ocfs2_lock_type type, | |
24c19ef4 | 432 | unsigned int generation, |
ccd979bd MF |
433 | struct inode *inode) |
434 | { | |
435 | struct ocfs2_lock_res_ops *ops; | |
436 | ||
437 | switch(type) { | |
438 | case OCFS2_LOCK_TYPE_RW: | |
439 | ops = &ocfs2_inode_rw_lops; | |
440 | break; | |
441 | case OCFS2_LOCK_TYPE_META: | |
e63aecb6 | 442 | ops = &ocfs2_inode_inode_lops; |
ccd979bd | 443 | break; |
50008630 TY |
444 | case OCFS2_LOCK_TYPE_OPEN: |
445 | ops = &ocfs2_inode_open_lops; | |
446 | break; | |
ccd979bd MF |
447 | default: |
448 | mlog_bug_on_msg(1, "type: %d\n", type); | |
449 | ops = NULL; /* thanks, gcc */ | |
450 | break; | |
451 | }; | |
452 | ||
d680efe9 | 453 | ocfs2_build_lock_name(type, OCFS2_I(inode)->ip_blkno, |
24c19ef4 | 454 | generation, res->l_name); |
d680efe9 MF |
455 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type, ops, inode); |
456 | } | |
457 | ||
54a7e755 MF |
458 | static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres) |
459 | { | |
460 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
461 | ||
462 | return OCFS2_SB(inode->i_sb); | |
463 | } | |
464 | ||
cf8e06f1 MF |
465 | static struct ocfs2_super *ocfs2_get_file_osb(struct ocfs2_lock_res *lockres) |
466 | { | |
467 | struct ocfs2_file_private *fp = lockres->l_priv; | |
468 | ||
469 | return OCFS2_SB(fp->fp_file->f_mapping->host->i_sb); | |
470 | } | |
471 | ||
d680efe9 MF |
472 | static __u64 ocfs2_get_dentry_lock_ino(struct ocfs2_lock_res *lockres) |
473 | { | |
474 | __be64 inode_blkno_be; | |
475 | ||
476 | memcpy(&inode_blkno_be, &lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], | |
477 | sizeof(__be64)); | |
478 | ||
479 | return be64_to_cpu(inode_blkno_be); | |
480 | } | |
481 | ||
54a7e755 MF |
482 | static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres) |
483 | { | |
484 | struct ocfs2_dentry_lock *dl = lockres->l_priv; | |
485 | ||
486 | return OCFS2_SB(dl->dl_inode->i_sb); | |
487 | } | |
488 | ||
d680efe9 MF |
489 | void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl, |
490 | u64 parent, struct inode *inode) | |
491 | { | |
492 | int len; | |
493 | u64 inode_blkno = OCFS2_I(inode)->ip_blkno; | |
494 | __be64 inode_blkno_be = cpu_to_be64(inode_blkno); | |
495 | struct ocfs2_lock_res *lockres = &dl->dl_lockres; | |
496 | ||
497 | ocfs2_lock_res_init_once(lockres); | |
498 | ||
499 | /* | |
500 | * Unfortunately, the standard lock naming scheme won't work | |
501 | * here because we have two 16 byte values to use. Instead, | |
502 | * we'll stuff the inode number as a binary value. We still | |
503 | * want error prints to show something without garbling the | |
504 | * display, so drop a null byte in there before the inode | |
505 | * number. A future version of OCFS2 will likely use all | |
506 | * binary lock names. The stringified names have been a | |
507 | * tremendous aid in debugging, but now that the debugfs | |
508 | * interface exists, we can mangle things there if need be. | |
509 | * | |
510 | * NOTE: We also drop the standard "pad" value (the total lock | |
511 | * name size stays the same though - the last part is all | |
512 | * zeros due to the memset in ocfs2_lock_res_init_once() | |
513 | */ | |
514 | len = snprintf(lockres->l_name, OCFS2_DENTRY_LOCK_INO_START, | |
515 | "%c%016llx", | |
516 | ocfs2_lock_type_char(OCFS2_LOCK_TYPE_DENTRY), | |
517 | (long long)parent); | |
518 | ||
519 | BUG_ON(len != (OCFS2_DENTRY_LOCK_INO_START - 1)); | |
520 | ||
521 | memcpy(&lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], &inode_blkno_be, | |
522 | sizeof(__be64)); | |
523 | ||
524 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres, | |
525 | OCFS2_LOCK_TYPE_DENTRY, &ocfs2_dentry_lops, | |
526 | dl); | |
ccd979bd MF |
527 | } |
528 | ||
529 | static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res, | |
530 | struct ocfs2_super *osb) | |
531 | { | |
532 | /* Superblock lockres doesn't come from a slab so we call init | |
533 | * once on it manually. */ | |
534 | ocfs2_lock_res_init_once(res); | |
d680efe9 MF |
535 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_SUPER, OCFS2_SUPER_BLOCK_BLKNO, |
536 | 0, res->l_name); | |
ccd979bd | 537 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER, |
ccd979bd MF |
538 | &ocfs2_super_lops, osb); |
539 | } | |
540 | ||
541 | static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res, | |
542 | struct ocfs2_super *osb) | |
543 | { | |
544 | /* Rename lockres doesn't come from a slab so we call init | |
545 | * once on it manually. */ | |
546 | ocfs2_lock_res_init_once(res); | |
d680efe9 MF |
547 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_RENAME, 0, 0, res->l_name); |
548 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME, | |
ccd979bd MF |
549 | &ocfs2_rename_lops, osb); |
550 | } | |
551 | ||
cf8e06f1 MF |
552 | void ocfs2_file_lock_res_init(struct ocfs2_lock_res *lockres, |
553 | struct ocfs2_file_private *fp) | |
554 | { | |
555 | struct inode *inode = fp->fp_file->f_mapping->host; | |
556 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
557 | ||
558 | ocfs2_lock_res_init_once(lockres); | |
559 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_FLOCK, oi->ip_blkno, | |
560 | inode->i_generation, lockres->l_name); | |
561 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres, | |
562 | OCFS2_LOCK_TYPE_FLOCK, &ocfs2_flock_lops, | |
563 | fp); | |
564 | lockres->l_flags |= OCFS2_LOCK_NOCACHE; | |
565 | } | |
566 | ||
ccd979bd MF |
567 | void ocfs2_lock_res_free(struct ocfs2_lock_res *res) |
568 | { | |
569 | mlog_entry_void(); | |
570 | ||
571 | if (!(res->l_flags & OCFS2_LOCK_INITIALIZED)) | |
572 | return; | |
573 | ||
574 | ocfs2_remove_lockres_tracking(res); | |
575 | ||
576 | mlog_bug_on_msg(!list_empty(&res->l_blocked_list), | |
577 | "Lockres %s is on the blocked list\n", | |
578 | res->l_name); | |
579 | mlog_bug_on_msg(!list_empty(&res->l_mask_waiters), | |
580 | "Lockres %s has mask waiters pending\n", | |
581 | res->l_name); | |
582 | mlog_bug_on_msg(spin_is_locked(&res->l_lock), | |
583 | "Lockres %s is locked\n", | |
584 | res->l_name); | |
585 | mlog_bug_on_msg(res->l_ro_holders, | |
586 | "Lockres %s has %u ro holders\n", | |
587 | res->l_name, res->l_ro_holders); | |
588 | mlog_bug_on_msg(res->l_ex_holders, | |
589 | "Lockres %s has %u ex holders\n", | |
590 | res->l_name, res->l_ex_holders); | |
591 | ||
592 | /* Need to clear out the lock status block for the dlm */ | |
593 | memset(&res->l_lksb, 0, sizeof(res->l_lksb)); | |
594 | ||
595 | res->l_flags = 0UL; | |
596 | mlog_exit_void(); | |
597 | } | |
598 | ||
599 | static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres, | |
600 | int level) | |
601 | { | |
602 | mlog_entry_void(); | |
603 | ||
604 | BUG_ON(!lockres); | |
605 | ||
606 | switch(level) { | |
607 | case LKM_EXMODE: | |
608 | lockres->l_ex_holders++; | |
609 | break; | |
610 | case LKM_PRMODE: | |
611 | lockres->l_ro_holders++; | |
612 | break; | |
613 | default: | |
614 | BUG(); | |
615 | } | |
616 | ||
617 | mlog_exit_void(); | |
618 | } | |
619 | ||
620 | static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres, | |
621 | int level) | |
622 | { | |
623 | mlog_entry_void(); | |
624 | ||
625 | BUG_ON(!lockres); | |
626 | ||
627 | switch(level) { | |
628 | case LKM_EXMODE: | |
629 | BUG_ON(!lockres->l_ex_holders); | |
630 | lockres->l_ex_holders--; | |
631 | break; | |
632 | case LKM_PRMODE: | |
633 | BUG_ON(!lockres->l_ro_holders); | |
634 | lockres->l_ro_holders--; | |
635 | break; | |
636 | default: | |
637 | BUG(); | |
638 | } | |
639 | mlog_exit_void(); | |
640 | } | |
641 | ||
642 | /* WARNING: This function lives in a world where the only three lock | |
643 | * levels are EX, PR, and NL. It *will* have to be adjusted when more | |
644 | * lock types are added. */ | |
645 | static inline int ocfs2_highest_compat_lock_level(int level) | |
646 | { | |
647 | int new_level = LKM_EXMODE; | |
648 | ||
649 | if (level == LKM_EXMODE) | |
650 | new_level = LKM_NLMODE; | |
651 | else if (level == LKM_PRMODE) | |
652 | new_level = LKM_PRMODE; | |
653 | return new_level; | |
654 | } | |
655 | ||
656 | static void lockres_set_flags(struct ocfs2_lock_res *lockres, | |
657 | unsigned long newflags) | |
658 | { | |
800deef3 | 659 | struct ocfs2_mask_waiter *mw, *tmp; |
ccd979bd MF |
660 | |
661 | assert_spin_locked(&lockres->l_lock); | |
662 | ||
663 | lockres->l_flags = newflags; | |
664 | ||
800deef3 | 665 | list_for_each_entry_safe(mw, tmp, &lockres->l_mask_waiters, mw_item) { |
ccd979bd MF |
666 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) |
667 | continue; | |
668 | ||
669 | list_del_init(&mw->mw_item); | |
670 | mw->mw_status = 0; | |
671 | complete(&mw->mw_complete); | |
672 | } | |
673 | } | |
674 | static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or) | |
675 | { | |
676 | lockres_set_flags(lockres, lockres->l_flags | or); | |
677 | } | |
678 | static void lockres_clear_flags(struct ocfs2_lock_res *lockres, | |
679 | unsigned long clear) | |
680 | { | |
681 | lockres_set_flags(lockres, lockres->l_flags & ~clear); | |
682 | } | |
683 | ||
684 | static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres) | |
685 | { | |
686 | mlog_entry_void(); | |
687 | ||
688 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); | |
689 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); | |
690 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
691 | BUG_ON(lockres->l_blocking <= LKM_NLMODE); | |
692 | ||
693 | lockres->l_level = lockres->l_requested; | |
694 | if (lockres->l_level <= | |
695 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) { | |
696 | lockres->l_blocking = LKM_NLMODE; | |
697 | lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED); | |
698 | } | |
699 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
700 | ||
701 | mlog_exit_void(); | |
702 | } | |
703 | ||
704 | static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres) | |
705 | { | |
706 | mlog_entry_void(); | |
707 | ||
708 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); | |
709 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); | |
710 | ||
711 | /* Convert from RO to EX doesn't really need anything as our | |
712 | * information is already up to data. Convert from NL to | |
713 | * *anything* however should mark ourselves as needing an | |
714 | * update */ | |
f625c979 MF |
715 | if (lockres->l_level == LKM_NLMODE && |
716 | lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) | |
ccd979bd MF |
717 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
718 | ||
719 | lockres->l_level = lockres->l_requested; | |
720 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
721 | ||
722 | mlog_exit_void(); | |
723 | } | |
724 | ||
725 | static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres) | |
726 | { | |
727 | mlog_entry_void(); | |
728 | ||
3cf0c507 | 729 | BUG_ON((!(lockres->l_flags & OCFS2_LOCK_BUSY))); |
ccd979bd MF |
730 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); |
731 | ||
732 | if (lockres->l_requested > LKM_NLMODE && | |
f625c979 MF |
733 | !(lockres->l_flags & OCFS2_LOCK_LOCAL) && |
734 | lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) | |
ccd979bd MF |
735 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
736 | ||
737 | lockres->l_level = lockres->l_requested; | |
738 | lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED); | |
739 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
740 | ||
741 | mlog_exit_void(); | |
742 | } | |
743 | ||
ccd979bd MF |
744 | static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, |
745 | int level) | |
746 | { | |
747 | int needs_downconvert = 0; | |
748 | mlog_entry_void(); | |
749 | ||
750 | assert_spin_locked(&lockres->l_lock); | |
751 | ||
752 | lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); | |
753 | ||
754 | if (level > lockres->l_blocking) { | |
755 | /* only schedule a downconvert if we haven't already scheduled | |
756 | * one that goes low enough to satisfy the level we're | |
757 | * blocking. this also catches the case where we get | |
758 | * duplicate BASTs */ | |
759 | if (ocfs2_highest_compat_lock_level(level) < | |
760 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) | |
761 | needs_downconvert = 1; | |
762 | ||
763 | lockres->l_blocking = level; | |
764 | } | |
765 | ||
766 | mlog_exit(needs_downconvert); | |
767 | return needs_downconvert; | |
768 | } | |
769 | ||
aa2623ad | 770 | static void ocfs2_blocking_ast(void *opaque, int level) |
ccd979bd | 771 | { |
aa2623ad MF |
772 | struct ocfs2_lock_res *lockres = opaque; |
773 | struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); | |
ccd979bd MF |
774 | int needs_downconvert; |
775 | unsigned long flags; | |
776 | ||
ccd979bd MF |
777 | BUG_ON(level <= LKM_NLMODE); |
778 | ||
aa2623ad MF |
779 | mlog(0, "BAST fired for lockres %s, blocking %d, level %d type %s\n", |
780 | lockres->l_name, level, lockres->l_level, | |
781 | ocfs2_lock_type_string(lockres->l_type)); | |
782 | ||
cf8e06f1 MF |
783 | /* |
784 | * We can skip the bast for locks which don't enable caching - | |
785 | * they'll be dropped at the earliest possible time anyway. | |
786 | */ | |
787 | if (lockres->l_flags & OCFS2_LOCK_NOCACHE) | |
788 | return; | |
789 | ||
ccd979bd MF |
790 | spin_lock_irqsave(&lockres->l_lock, flags); |
791 | needs_downconvert = ocfs2_generic_handle_bast(lockres, level); | |
792 | if (needs_downconvert) | |
793 | ocfs2_schedule_blocked_lock(osb, lockres); | |
794 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
795 | ||
d680efe9 MF |
796 | wake_up(&lockres->l_event); |
797 | ||
34d024f8 | 798 | ocfs2_wake_downconvert_thread(osb); |
ccd979bd MF |
799 | } |
800 | ||
e92d57df | 801 | static void ocfs2_locking_ast(void *opaque) |
ccd979bd | 802 | { |
e92d57df | 803 | struct ocfs2_lock_res *lockres = opaque; |
ccd979bd MF |
804 | struct dlm_lockstatus *lksb = &lockres->l_lksb; |
805 | unsigned long flags; | |
806 | ||
807 | spin_lock_irqsave(&lockres->l_lock, flags); | |
808 | ||
809 | if (lksb->status != DLM_NORMAL) { | |
810 | mlog(ML_ERROR, "lockres %s: lksb status value of %u!\n", | |
811 | lockres->l_name, lksb->status); | |
812 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
813 | return; | |
814 | } | |
815 | ||
816 | switch(lockres->l_action) { | |
817 | case OCFS2_AST_ATTACH: | |
818 | ocfs2_generic_handle_attach_action(lockres); | |
e92d57df | 819 | lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL); |
ccd979bd MF |
820 | break; |
821 | case OCFS2_AST_CONVERT: | |
822 | ocfs2_generic_handle_convert_action(lockres); | |
823 | break; | |
824 | case OCFS2_AST_DOWNCONVERT: | |
825 | ocfs2_generic_handle_downconvert_action(lockres); | |
826 | break; | |
827 | default: | |
e92d57df MF |
828 | mlog(ML_ERROR, "lockres %s: ast fired with invalid action: %u " |
829 | "lockres flags = 0x%lx, unlock action: %u\n", | |
830 | lockres->l_name, lockres->l_action, lockres->l_flags, | |
831 | lockres->l_unlock_action); | |
ccd979bd MF |
832 | BUG(); |
833 | } | |
834 | ||
ccd979bd MF |
835 | /* set it to something invalid so if we get called again we |
836 | * can catch it. */ | |
837 | lockres->l_action = OCFS2_AST_INVALID; | |
ccd979bd MF |
838 | |
839 | wake_up(&lockres->l_event); | |
d680efe9 | 840 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
ccd979bd MF |
841 | } |
842 | ||
ccd979bd MF |
843 | static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, |
844 | int convert) | |
845 | { | |
846 | unsigned long flags; | |
847 | ||
848 | mlog_entry_void(); | |
849 | spin_lock_irqsave(&lockres->l_lock, flags); | |
850 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
851 | if (convert) | |
852 | lockres->l_action = OCFS2_AST_INVALID; | |
853 | else | |
854 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
855 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
856 | ||
857 | wake_up(&lockres->l_event); | |
858 | mlog_exit_void(); | |
859 | } | |
860 | ||
861 | /* Note: If we detect another process working on the lock (i.e., | |
862 | * OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller | |
863 | * to do the right thing in that case. | |
864 | */ | |
865 | static int ocfs2_lock_create(struct ocfs2_super *osb, | |
866 | struct ocfs2_lock_res *lockres, | |
867 | int level, | |
868 | int dlm_flags) | |
869 | { | |
870 | int ret = 0; | |
c271c5c2 | 871 | enum dlm_status status = DLM_NORMAL; |
ccd979bd MF |
872 | unsigned long flags; |
873 | ||
874 | mlog_entry_void(); | |
875 | ||
876 | mlog(0, "lock %s, level = %d, flags = %d\n", lockres->l_name, level, | |
877 | dlm_flags); | |
878 | ||
879 | spin_lock_irqsave(&lockres->l_lock, flags); | |
880 | if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) || | |
881 | (lockres->l_flags & OCFS2_LOCK_BUSY)) { | |
882 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
883 | goto bail; | |
884 | } | |
885 | ||
886 | lockres->l_action = OCFS2_AST_ATTACH; | |
887 | lockres->l_requested = level; | |
888 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
889 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
890 | ||
891 | status = dlmlock(osb->dlm, | |
892 | level, | |
893 | &lockres->l_lksb, | |
894 | dlm_flags, | |
895 | lockres->l_name, | |
f0681062 | 896 | OCFS2_LOCK_ID_MAX_LEN - 1, |
e92d57df | 897 | ocfs2_locking_ast, |
ccd979bd | 898 | lockres, |
aa2623ad | 899 | ocfs2_blocking_ast); |
ccd979bd MF |
900 | if (status != DLM_NORMAL) { |
901 | ocfs2_log_dlm_error("dlmlock", status, lockres); | |
902 | ret = -EINVAL; | |
903 | ocfs2_recover_from_dlm_error(lockres, 1); | |
904 | } | |
905 | ||
906 | mlog(0, "lock %s, successfull return from dlmlock\n", lockres->l_name); | |
907 | ||
908 | bail: | |
909 | mlog_exit(ret); | |
910 | return ret; | |
911 | } | |
912 | ||
913 | static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres, | |
914 | int flag) | |
915 | { | |
916 | unsigned long flags; | |
917 | int ret; | |
918 | ||
919 | spin_lock_irqsave(&lockres->l_lock, flags); | |
920 | ret = lockres->l_flags & flag; | |
921 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
922 | ||
923 | return ret; | |
924 | } | |
925 | ||
926 | static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres) | |
927 | ||
928 | { | |
929 | wait_event(lockres->l_event, | |
930 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY)); | |
931 | } | |
932 | ||
933 | static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres) | |
934 | ||
935 | { | |
936 | wait_event(lockres->l_event, | |
937 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING)); | |
938 | } | |
939 | ||
940 | /* predict what lock level we'll be dropping down to on behalf | |
941 | * of another node, and return true if the currently wanted | |
942 | * level will be compatible with it. */ | |
943 | static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, | |
944 | int wanted) | |
945 | { | |
946 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
947 | ||
948 | return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking); | |
949 | } | |
950 | ||
951 | static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw) | |
952 | { | |
953 | INIT_LIST_HEAD(&mw->mw_item); | |
954 | init_completion(&mw->mw_complete); | |
955 | } | |
956 | ||
957 | static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw) | |
958 | { | |
959 | wait_for_completion(&mw->mw_complete); | |
960 | /* Re-arm the completion in case we want to wait on it again */ | |
961 | INIT_COMPLETION(mw->mw_complete); | |
962 | return mw->mw_status; | |
963 | } | |
964 | ||
965 | static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres, | |
966 | struct ocfs2_mask_waiter *mw, | |
967 | unsigned long mask, | |
968 | unsigned long goal) | |
969 | { | |
970 | BUG_ON(!list_empty(&mw->mw_item)); | |
971 | ||
972 | assert_spin_locked(&lockres->l_lock); | |
973 | ||
974 | list_add_tail(&mw->mw_item, &lockres->l_mask_waiters); | |
975 | mw->mw_mask = mask; | |
976 | mw->mw_goal = goal; | |
977 | } | |
978 | ||
979 | /* returns 0 if the mw that was removed was already satisfied, -EBUSY | |
980 | * if the mask still hadn't reached its goal */ | |
981 | static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres, | |
982 | struct ocfs2_mask_waiter *mw) | |
983 | { | |
984 | unsigned long flags; | |
985 | int ret = 0; | |
986 | ||
987 | spin_lock_irqsave(&lockres->l_lock, flags); | |
988 | if (!list_empty(&mw->mw_item)) { | |
989 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) | |
990 | ret = -EBUSY; | |
991 | ||
992 | list_del_init(&mw->mw_item); | |
993 | init_completion(&mw->mw_complete); | |
994 | } | |
995 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
996 | ||
997 | return ret; | |
998 | ||
999 | } | |
1000 | ||
cf8e06f1 MF |
1001 | static int ocfs2_wait_for_mask_interruptible(struct ocfs2_mask_waiter *mw, |
1002 | struct ocfs2_lock_res *lockres) | |
1003 | { | |
1004 | int ret; | |
1005 | ||
1006 | ret = wait_for_completion_interruptible(&mw->mw_complete); | |
1007 | if (ret) | |
1008 | lockres_remove_mask_waiter(lockres, mw); | |
1009 | else | |
1010 | ret = mw->mw_status; | |
1011 | /* Re-arm the completion in case we want to wait on it again */ | |
1012 | INIT_COMPLETION(mw->mw_complete); | |
1013 | return ret; | |
1014 | } | |
1015 | ||
ccd979bd MF |
1016 | static int ocfs2_cluster_lock(struct ocfs2_super *osb, |
1017 | struct ocfs2_lock_res *lockres, | |
1018 | int level, | |
1019 | int lkm_flags, | |
1020 | int arg_flags) | |
1021 | { | |
1022 | struct ocfs2_mask_waiter mw; | |
1023 | enum dlm_status status; | |
1024 | int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR); | |
1025 | int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */ | |
1026 | unsigned long flags; | |
1027 | ||
1028 | mlog_entry_void(); | |
1029 | ||
1030 | ocfs2_init_mask_waiter(&mw); | |
1031 | ||
b80fc012 MF |
1032 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
1033 | lkm_flags |= LKM_VALBLK; | |
1034 | ||
ccd979bd MF |
1035 | again: |
1036 | wait = 0; | |
1037 | ||
1038 | if (catch_signals && signal_pending(current)) { | |
1039 | ret = -ERESTARTSYS; | |
1040 | goto out; | |
1041 | } | |
1042 | ||
1043 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1044 | ||
1045 | mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING, | |
1046 | "Cluster lock called on freeing lockres %s! flags " | |
1047 | "0x%lx\n", lockres->l_name, lockres->l_flags); | |
1048 | ||
1049 | /* We only compare against the currently granted level | |
1050 | * here. If the lock is blocked waiting on a downconvert, | |
1051 | * we'll get caught below. */ | |
1052 | if (lockres->l_flags & OCFS2_LOCK_BUSY && | |
1053 | level > lockres->l_level) { | |
1054 | /* is someone sitting in dlm_lock? If so, wait on | |
1055 | * them. */ | |
1056 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
1057 | wait = 1; | |
1058 | goto unlock; | |
1059 | } | |
1060 | ||
ccd979bd MF |
1061 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED && |
1062 | !ocfs2_may_continue_on_blocked_lock(lockres, level)) { | |
1063 | /* is the lock is currently blocked on behalf of | |
1064 | * another node */ | |
1065 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0); | |
1066 | wait = 1; | |
1067 | goto unlock; | |
1068 | } | |
1069 | ||
1070 | if (level > lockres->l_level) { | |
1071 | if (lockres->l_action != OCFS2_AST_INVALID) | |
1072 | mlog(ML_ERROR, "lockres %s has action %u pending\n", | |
1073 | lockres->l_name, lockres->l_action); | |
1074 | ||
019d1b22 MF |
1075 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { |
1076 | lockres->l_action = OCFS2_AST_ATTACH; | |
1077 | lkm_flags &= ~LKM_CONVERT; | |
1078 | } else { | |
1079 | lockres->l_action = OCFS2_AST_CONVERT; | |
1080 | lkm_flags |= LKM_CONVERT; | |
1081 | } | |
1082 | ||
ccd979bd MF |
1083 | lockres->l_requested = level; |
1084 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
1085 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1086 | ||
1087 | BUG_ON(level == LKM_IVMODE); | |
1088 | BUG_ON(level == LKM_NLMODE); | |
1089 | ||
1090 | mlog(0, "lock %s, convert from %d to level = %d\n", | |
1091 | lockres->l_name, lockres->l_level, level); | |
1092 | ||
1093 | /* call dlm_lock to upgrade lock now */ | |
1094 | status = dlmlock(osb->dlm, | |
1095 | level, | |
1096 | &lockres->l_lksb, | |
019d1b22 | 1097 | lkm_flags, |
ccd979bd | 1098 | lockres->l_name, |
f0681062 | 1099 | OCFS2_LOCK_ID_MAX_LEN - 1, |
e92d57df | 1100 | ocfs2_locking_ast, |
ccd979bd | 1101 | lockres, |
aa2623ad | 1102 | ocfs2_blocking_ast); |
ccd979bd MF |
1103 | if (status != DLM_NORMAL) { |
1104 | if ((lkm_flags & LKM_NOQUEUE) && | |
1105 | (status == DLM_NOTQUEUED)) | |
1106 | ret = -EAGAIN; | |
1107 | else { | |
1108 | ocfs2_log_dlm_error("dlmlock", status, | |
1109 | lockres); | |
1110 | ret = -EINVAL; | |
1111 | } | |
1112 | ocfs2_recover_from_dlm_error(lockres, 1); | |
1113 | goto out; | |
1114 | } | |
1115 | ||
1116 | mlog(0, "lock %s, successfull return from dlmlock\n", | |
1117 | lockres->l_name); | |
1118 | ||
1119 | /* At this point we've gone inside the dlm and need to | |
1120 | * complete our work regardless. */ | |
1121 | catch_signals = 0; | |
1122 | ||
1123 | /* wait for busy to clear and carry on */ | |
1124 | goto again; | |
1125 | } | |
1126 | ||
1127 | /* Ok, if we get here then we're good to go. */ | |
1128 | ocfs2_inc_holders(lockres, level); | |
1129 | ||
1130 | ret = 0; | |
1131 | unlock: | |
1132 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1133 | out: | |
1134 | /* | |
1135 | * This is helping work around a lock inversion between the page lock | |
1136 | * and dlm locks. One path holds the page lock while calling aops | |
1137 | * which block acquiring dlm locks. The voting thread holds dlm | |
1138 | * locks while acquiring page locks while down converting data locks. | |
1139 | * This block is helping an aop path notice the inversion and back | |
1140 | * off to unlock its page lock before trying the dlm lock again. | |
1141 | */ | |
1142 | if (wait && arg_flags & OCFS2_LOCK_NONBLOCK && | |
1143 | mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) { | |
1144 | wait = 0; | |
1145 | if (lockres_remove_mask_waiter(lockres, &mw)) | |
1146 | ret = -EAGAIN; | |
1147 | else | |
1148 | goto again; | |
1149 | } | |
1150 | if (wait) { | |
1151 | ret = ocfs2_wait_for_mask(&mw); | |
1152 | if (ret == 0) | |
1153 | goto again; | |
1154 | mlog_errno(ret); | |
1155 | } | |
1156 | ||
1157 | mlog_exit(ret); | |
1158 | return ret; | |
1159 | } | |
1160 | ||
1161 | static void ocfs2_cluster_unlock(struct ocfs2_super *osb, | |
1162 | struct ocfs2_lock_res *lockres, | |
1163 | int level) | |
1164 | { | |
1165 | unsigned long flags; | |
1166 | ||
1167 | mlog_entry_void(); | |
1168 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1169 | ocfs2_dec_holders(lockres, level); | |
34d024f8 | 1170 | ocfs2_downconvert_on_unlock(osb, lockres); |
ccd979bd MF |
1171 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1172 | mlog_exit_void(); | |
1173 | } | |
1174 | ||
da66116e AB |
1175 | static int ocfs2_create_new_lock(struct ocfs2_super *osb, |
1176 | struct ocfs2_lock_res *lockres, | |
1177 | int ex, | |
1178 | int local) | |
ccd979bd | 1179 | { |
d680efe9 | 1180 | int level = ex ? LKM_EXMODE : LKM_PRMODE; |
ccd979bd | 1181 | unsigned long flags; |
24c19ef4 | 1182 | int lkm_flags = local ? LKM_LOCAL : 0; |
ccd979bd MF |
1183 | |
1184 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1185 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); | |
1186 | lockres_or_flags(lockres, OCFS2_LOCK_LOCAL); | |
1187 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1188 | ||
24c19ef4 | 1189 | return ocfs2_lock_create(osb, lockres, level, lkm_flags); |
ccd979bd MF |
1190 | } |
1191 | ||
1192 | /* Grants us an EX lock on the data and metadata resources, skipping | |
1193 | * the normal cluster directory lookup. Use this ONLY on newly created | |
1194 | * inodes which other nodes can't possibly see, and which haven't been | |
1195 | * hashed in the inode hash yet. This can give us a good performance | |
1196 | * increase as it'll skip the network broadcast normally associated | |
1197 | * with creating a new lock resource. */ | |
1198 | int ocfs2_create_new_inode_locks(struct inode *inode) | |
1199 | { | |
1200 | int ret; | |
d680efe9 | 1201 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
1202 | |
1203 | BUG_ON(!inode); | |
1204 | BUG_ON(!ocfs2_inode_is_new(inode)); | |
1205 | ||
1206 | mlog_entry_void(); | |
1207 | ||
b0697053 | 1208 | mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno); |
ccd979bd MF |
1209 | |
1210 | /* NOTE: That we don't increment any of the holder counts, nor | |
1211 | * do we add anything to a journal handle. Since this is | |
1212 | * supposed to be a new inode which the cluster doesn't know | |
1213 | * about yet, there is no need to. As far as the LVB handling | |
1214 | * is concerned, this is basically like acquiring an EX lock | |
1215 | * on a resource which has an invalid one -- we'll set it | |
1216 | * valid when we release the EX. */ | |
1217 | ||
24c19ef4 | 1218 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_rw_lockres, 1, 1); |
ccd979bd MF |
1219 | if (ret) { |
1220 | mlog_errno(ret); | |
1221 | goto bail; | |
1222 | } | |
1223 | ||
24c19ef4 MF |
1224 | /* |
1225 | * We don't want to use LKM_LOCAL on a meta data lock as they | |
1226 | * don't use a generation in their lock names. | |
1227 | */ | |
e63aecb6 | 1228 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_inode_lockres, 1, 0); |
ccd979bd MF |
1229 | if (ret) { |
1230 | mlog_errno(ret); | |
1231 | goto bail; | |
1232 | } | |
1233 | ||
50008630 TY |
1234 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_open_lockres, 0, 0); |
1235 | if (ret) { | |
1236 | mlog_errno(ret); | |
1237 | goto bail; | |
1238 | } | |
1239 | ||
ccd979bd MF |
1240 | bail: |
1241 | mlog_exit(ret); | |
1242 | return ret; | |
1243 | } | |
1244 | ||
1245 | int ocfs2_rw_lock(struct inode *inode, int write) | |
1246 | { | |
1247 | int status, level; | |
1248 | struct ocfs2_lock_res *lockres; | |
c271c5c2 | 1249 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
1250 | |
1251 | BUG_ON(!inode); | |
1252 | ||
1253 | mlog_entry_void(); | |
1254 | ||
b0697053 MF |
1255 | mlog(0, "inode %llu take %s RW lock\n", |
1256 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1257 | write ? "EXMODE" : "PRMODE"); |
1258 | ||
c271c5c2 SM |
1259 | if (ocfs2_mount_local(osb)) |
1260 | return 0; | |
1261 | ||
ccd979bd MF |
1262 | lockres = &OCFS2_I(inode)->ip_rw_lockres; |
1263 | ||
1264 | level = write ? LKM_EXMODE : LKM_PRMODE; | |
1265 | ||
1266 | status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, 0, | |
1267 | 0); | |
1268 | if (status < 0) | |
1269 | mlog_errno(status); | |
1270 | ||
1271 | mlog_exit(status); | |
1272 | return status; | |
1273 | } | |
1274 | ||
1275 | void ocfs2_rw_unlock(struct inode *inode, int write) | |
1276 | { | |
1277 | int level = write ? LKM_EXMODE : LKM_PRMODE; | |
1278 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres; | |
c271c5c2 | 1279 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
1280 | |
1281 | mlog_entry_void(); | |
1282 | ||
b0697053 MF |
1283 | mlog(0, "inode %llu drop %s RW lock\n", |
1284 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1285 | write ? "EXMODE" : "PRMODE"); |
1286 | ||
c271c5c2 SM |
1287 | if (!ocfs2_mount_local(osb)) |
1288 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); | |
ccd979bd MF |
1289 | |
1290 | mlog_exit_void(); | |
1291 | } | |
1292 | ||
50008630 TY |
1293 | /* |
1294 | * ocfs2_open_lock always get PR mode lock. | |
1295 | */ | |
1296 | int ocfs2_open_lock(struct inode *inode) | |
1297 | { | |
1298 | int status = 0; | |
1299 | struct ocfs2_lock_res *lockres; | |
1300 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1301 | ||
1302 | BUG_ON(!inode); | |
1303 | ||
1304 | mlog_entry_void(); | |
1305 | ||
1306 | mlog(0, "inode %llu take PRMODE open lock\n", | |
1307 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
1308 | ||
1309 | if (ocfs2_mount_local(osb)) | |
1310 | goto out; | |
1311 | ||
1312 | lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1313 | ||
1314 | status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, | |
1315 | LKM_PRMODE, 0, 0); | |
1316 | if (status < 0) | |
1317 | mlog_errno(status); | |
1318 | ||
1319 | out: | |
1320 | mlog_exit(status); | |
1321 | return status; | |
1322 | } | |
1323 | ||
1324 | int ocfs2_try_open_lock(struct inode *inode, int write) | |
1325 | { | |
1326 | int status = 0, level; | |
1327 | struct ocfs2_lock_res *lockres; | |
1328 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1329 | ||
1330 | BUG_ON(!inode); | |
1331 | ||
1332 | mlog_entry_void(); | |
1333 | ||
1334 | mlog(0, "inode %llu try to take %s open lock\n", | |
1335 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
1336 | write ? "EXMODE" : "PRMODE"); | |
1337 | ||
1338 | if (ocfs2_mount_local(osb)) | |
1339 | goto out; | |
1340 | ||
1341 | lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1342 | ||
1343 | level = write ? LKM_EXMODE : LKM_PRMODE; | |
1344 | ||
1345 | /* | |
1346 | * The file system may already holding a PRMODE/EXMODE open lock. | |
1347 | * Since we pass LKM_NOQUEUE, the request won't block waiting on | |
1348 | * other nodes and the -EAGAIN will indicate to the caller that | |
1349 | * this inode is still in use. | |
1350 | */ | |
1351 | status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, | |
1352 | level, LKM_NOQUEUE, 0); | |
1353 | ||
1354 | out: | |
1355 | mlog_exit(status); | |
1356 | return status; | |
1357 | } | |
1358 | ||
1359 | /* | |
1360 | * ocfs2_open_unlock unlock PR and EX mode open locks. | |
1361 | */ | |
1362 | void ocfs2_open_unlock(struct inode *inode) | |
1363 | { | |
1364 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1365 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1366 | ||
1367 | mlog_entry_void(); | |
1368 | ||
1369 | mlog(0, "inode %llu drop open lock\n", | |
1370 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
1371 | ||
1372 | if (ocfs2_mount_local(osb)) | |
1373 | goto out; | |
1374 | ||
1375 | if(lockres->l_ro_holders) | |
1376 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, | |
1377 | LKM_PRMODE); | |
1378 | if(lockres->l_ex_holders) | |
1379 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, | |
1380 | LKM_EXMODE); | |
1381 | ||
1382 | out: | |
1383 | mlog_exit_void(); | |
1384 | } | |
1385 | ||
cf8e06f1 MF |
1386 | static int ocfs2_flock_handle_signal(struct ocfs2_lock_res *lockres, |
1387 | int level) | |
1388 | { | |
1389 | int ret; | |
1390 | struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); | |
1391 | unsigned long flags; | |
1392 | struct ocfs2_mask_waiter mw; | |
1393 | ||
1394 | ocfs2_init_mask_waiter(&mw); | |
1395 | ||
1396 | retry_cancel: | |
1397 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1398 | if (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
1399 | ret = ocfs2_prepare_cancel_convert(osb, lockres); | |
1400 | if (ret) { | |
1401 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1402 | ret = ocfs2_cancel_convert(osb, lockres); | |
1403 | if (ret < 0) { | |
1404 | mlog_errno(ret); | |
1405 | goto out; | |
1406 | } | |
1407 | goto retry_cancel; | |
1408 | } | |
1409 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
1410 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1411 | ||
1412 | ocfs2_wait_for_mask(&mw); | |
1413 | goto retry_cancel; | |
1414 | } | |
1415 | ||
1416 | ret = -ERESTARTSYS; | |
1417 | /* | |
1418 | * We may still have gotten the lock, in which case there's no | |
1419 | * point to restarting the syscall. | |
1420 | */ | |
1421 | if (lockres->l_level == level) | |
1422 | ret = 0; | |
1423 | ||
1424 | mlog(0, "Cancel returning %d. flags: 0x%lx, level: %d, act: %d\n", ret, | |
1425 | lockres->l_flags, lockres->l_level, lockres->l_action); | |
1426 | ||
1427 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1428 | ||
1429 | out: | |
1430 | return ret; | |
1431 | } | |
1432 | ||
1433 | /* | |
1434 | * ocfs2_file_lock() and ocfs2_file_unlock() map to a single pair of | |
1435 | * flock() calls. The locking approach this requires is sufficiently | |
1436 | * different from all other cluster lock types that we implement a | |
1437 | * seperate path to the "low-level" dlm calls. In particular: | |
1438 | * | |
1439 | * - No optimization of lock levels is done - we take at exactly | |
1440 | * what's been requested. | |
1441 | * | |
1442 | * - No lock caching is employed. We immediately downconvert to | |
1443 | * no-lock at unlock time. This also means flock locks never go on | |
1444 | * the blocking list). | |
1445 | * | |
1446 | * - Since userspace can trivially deadlock itself with flock, we make | |
1447 | * sure to allow cancellation of a misbehaving applications flock() | |
1448 | * request. | |
1449 | * | |
1450 | * - Access to any flock lockres doesn't require concurrency, so we | |
1451 | * can simplify the code by requiring the caller to guarantee | |
1452 | * serialization of dlmglue flock calls. | |
1453 | */ | |
1454 | int ocfs2_file_lock(struct file *file, int ex, int trylock) | |
1455 | { | |
1456 | int ret, level = ex ? LKM_EXMODE : LKM_PRMODE; | |
1457 | unsigned int lkm_flags = trylock ? LKM_NOQUEUE : 0; | |
1458 | unsigned long flags; | |
1459 | struct ocfs2_file_private *fp = file->private_data; | |
1460 | struct ocfs2_lock_res *lockres = &fp->fp_flock; | |
1461 | struct ocfs2_super *osb = OCFS2_SB(file->f_mapping->host->i_sb); | |
1462 | struct ocfs2_mask_waiter mw; | |
1463 | ||
1464 | ocfs2_init_mask_waiter(&mw); | |
1465 | ||
1466 | if ((lockres->l_flags & OCFS2_LOCK_BUSY) || | |
1467 | (lockres->l_level > LKM_NLMODE)) { | |
1468 | mlog(ML_ERROR, | |
1469 | "File lock \"%s\" has busy or locked state: flags: 0x%lx, " | |
1470 | "level: %u\n", lockres->l_name, lockres->l_flags, | |
1471 | lockres->l_level); | |
1472 | return -EINVAL; | |
1473 | } | |
1474 | ||
1475 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1476 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { | |
1477 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
1478 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1479 | ||
1480 | /* | |
1481 | * Get the lock at NLMODE to start - that way we | |
1482 | * can cancel the upconvert request if need be. | |
1483 | */ | |
1484 | ret = ocfs2_lock_create(osb, lockres, LKM_NLMODE, 0); | |
1485 | if (ret < 0) { | |
1486 | mlog_errno(ret); | |
1487 | goto out; | |
1488 | } | |
1489 | ||
1490 | ret = ocfs2_wait_for_mask(&mw); | |
1491 | if (ret) { | |
1492 | mlog_errno(ret); | |
1493 | goto out; | |
1494 | } | |
1495 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1496 | } | |
1497 | ||
1498 | lockres->l_action = OCFS2_AST_CONVERT; | |
1499 | lkm_flags |= LKM_CONVERT; | |
1500 | lockres->l_requested = level; | |
1501 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
1502 | ||
1503 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
1504 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1505 | ||
1506 | ret = dlmlock(osb->dlm, level, &lockres->l_lksb, lkm_flags, | |
1507 | lockres->l_name, OCFS2_LOCK_ID_MAX_LEN - 1, | |
1508 | ocfs2_locking_ast, lockres, ocfs2_blocking_ast); | |
1509 | if (ret != DLM_NORMAL) { | |
1510 | if (trylock && ret == DLM_NOTQUEUED) | |
1511 | ret = -EAGAIN; | |
1512 | else { | |
1513 | ocfs2_log_dlm_error("dlmlock", ret, lockres); | |
1514 | ret = -EINVAL; | |
1515 | } | |
1516 | ||
1517 | ocfs2_recover_from_dlm_error(lockres, 1); | |
1518 | lockres_remove_mask_waiter(lockres, &mw); | |
1519 | goto out; | |
1520 | } | |
1521 | ||
1522 | ret = ocfs2_wait_for_mask_interruptible(&mw, lockres); | |
1523 | if (ret == -ERESTARTSYS) { | |
1524 | /* | |
1525 | * Userspace can cause deadlock itself with | |
1526 | * flock(). Current behavior locally is to allow the | |
1527 | * deadlock, but abort the system call if a signal is | |
1528 | * received. We follow this example, otherwise a | |
1529 | * poorly written program could sit in kernel until | |
1530 | * reboot. | |
1531 | * | |
1532 | * Handling this is a bit more complicated for Ocfs2 | |
1533 | * though. We can't exit this function with an | |
1534 | * outstanding lock request, so a cancel convert is | |
1535 | * required. We intentionally overwrite 'ret' - if the | |
1536 | * cancel fails and the lock was granted, it's easier | |
1537 | * to just bubble sucess back up to the user. | |
1538 | */ | |
1539 | ret = ocfs2_flock_handle_signal(lockres, level); | |
1540 | } | |
1541 | ||
1542 | out: | |
1543 | ||
1544 | mlog(0, "Lock: \"%s\" ex: %d, trylock: %d, returns: %d\n", | |
1545 | lockres->l_name, ex, trylock, ret); | |
1546 | return ret; | |
1547 | } | |
1548 | ||
1549 | void ocfs2_file_unlock(struct file *file) | |
1550 | { | |
1551 | int ret; | |
1552 | unsigned long flags; | |
1553 | struct ocfs2_file_private *fp = file->private_data; | |
1554 | struct ocfs2_lock_res *lockres = &fp->fp_flock; | |
1555 | struct ocfs2_super *osb = OCFS2_SB(file->f_mapping->host->i_sb); | |
1556 | struct ocfs2_mask_waiter mw; | |
1557 | ||
1558 | ocfs2_init_mask_waiter(&mw); | |
1559 | ||
1560 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) | |
1561 | return; | |
1562 | ||
1563 | if (lockres->l_level == LKM_NLMODE) | |
1564 | return; | |
1565 | ||
1566 | mlog(0, "Unlock: \"%s\" flags: 0x%lx, level: %d, act: %d\n", | |
1567 | lockres->l_name, lockres->l_flags, lockres->l_level, | |
1568 | lockres->l_action); | |
1569 | ||
1570 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1571 | /* | |
1572 | * Fake a blocking ast for the downconvert code. | |
1573 | */ | |
1574 | lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); | |
1575 | lockres->l_blocking = LKM_EXMODE; | |
1576 | ||
1577 | ocfs2_prepare_downconvert(lockres, LKM_NLMODE); | |
1578 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
1579 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1580 | ||
1581 | ret = ocfs2_downconvert_lock(osb, lockres, LKM_NLMODE, 0); | |
1582 | if (ret) { | |
1583 | mlog_errno(ret); | |
1584 | return; | |
1585 | } | |
1586 | ||
1587 | ret = ocfs2_wait_for_mask(&mw); | |
1588 | if (ret) | |
1589 | mlog_errno(ret); | |
1590 | } | |
1591 | ||
34d024f8 MF |
1592 | static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb, |
1593 | struct ocfs2_lock_res *lockres) | |
ccd979bd MF |
1594 | { |
1595 | int kick = 0; | |
1596 | ||
1597 | mlog_entry_void(); | |
1598 | ||
1599 | /* If we know that another node is waiting on our lock, kick | |
34d024f8 | 1600 | * the downconvert thread * pre-emptively when we reach a release |
ccd979bd MF |
1601 | * condition. */ |
1602 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) { | |
1603 | switch(lockres->l_blocking) { | |
1604 | case LKM_EXMODE: | |
1605 | if (!lockres->l_ex_holders && !lockres->l_ro_holders) | |
1606 | kick = 1; | |
1607 | break; | |
1608 | case LKM_PRMODE: | |
1609 | if (!lockres->l_ex_holders) | |
1610 | kick = 1; | |
1611 | break; | |
1612 | default: | |
1613 | BUG(); | |
1614 | } | |
1615 | } | |
1616 | ||
1617 | if (kick) | |
34d024f8 | 1618 | ocfs2_wake_downconvert_thread(osb); |
ccd979bd MF |
1619 | |
1620 | mlog_exit_void(); | |
1621 | } | |
1622 | ||
ccd979bd MF |
1623 | #define OCFS2_SEC_BITS 34 |
1624 | #define OCFS2_SEC_SHIFT (64 - 34) | |
1625 | #define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1) | |
1626 | ||
1627 | /* LVB only has room for 64 bits of time here so we pack it for | |
1628 | * now. */ | |
1629 | static u64 ocfs2_pack_timespec(struct timespec *spec) | |
1630 | { | |
1631 | u64 res; | |
1632 | u64 sec = spec->tv_sec; | |
1633 | u32 nsec = spec->tv_nsec; | |
1634 | ||
1635 | res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK); | |
1636 | ||
1637 | return res; | |
1638 | } | |
1639 | ||
1640 | /* Call this with the lockres locked. I am reasonably sure we don't | |
1641 | * need ip_lock in this function as anyone who would be changing those | |
e63aecb6 | 1642 | * values is supposed to be blocked in ocfs2_inode_lock right now. */ |
ccd979bd MF |
1643 | static void __ocfs2_stuff_meta_lvb(struct inode *inode) |
1644 | { | |
1645 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
e63aecb6 | 1646 | struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
ccd979bd MF |
1647 | struct ocfs2_meta_lvb *lvb; |
1648 | ||
1649 | mlog_entry_void(); | |
1650 | ||
1651 | lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; | |
1652 | ||
24c19ef4 MF |
1653 | /* |
1654 | * Invalidate the LVB of a deleted inode - this way other | |
1655 | * nodes are forced to go to disk and discover the new inode | |
1656 | * status. | |
1657 | */ | |
1658 | if (oi->ip_flags & OCFS2_INODE_DELETED) { | |
1659 | lvb->lvb_version = 0; | |
1660 | goto out; | |
1661 | } | |
1662 | ||
4d3b83f7 | 1663 | lvb->lvb_version = OCFS2_LVB_VERSION; |
ccd979bd MF |
1664 | lvb->lvb_isize = cpu_to_be64(i_size_read(inode)); |
1665 | lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters); | |
1666 | lvb->lvb_iuid = cpu_to_be32(inode->i_uid); | |
1667 | lvb->lvb_igid = cpu_to_be32(inode->i_gid); | |
1668 | lvb->lvb_imode = cpu_to_be16(inode->i_mode); | |
1669 | lvb->lvb_inlink = cpu_to_be16(inode->i_nlink); | |
1670 | lvb->lvb_iatime_packed = | |
1671 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime)); | |
1672 | lvb->lvb_ictime_packed = | |
1673 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime)); | |
1674 | lvb->lvb_imtime_packed = | |
1675 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime)); | |
ca4d147e | 1676 | lvb->lvb_iattr = cpu_to_be32(oi->ip_attr); |
15b1e36b | 1677 | lvb->lvb_idynfeatures = cpu_to_be16(oi->ip_dyn_features); |
f9e2d82e | 1678 | lvb->lvb_igeneration = cpu_to_be32(inode->i_generation); |
ccd979bd | 1679 | |
24c19ef4 | 1680 | out: |
ccd979bd MF |
1681 | mlog_meta_lvb(0, lockres); |
1682 | ||
1683 | mlog_exit_void(); | |
1684 | } | |
1685 | ||
1686 | static void ocfs2_unpack_timespec(struct timespec *spec, | |
1687 | u64 packed_time) | |
1688 | { | |
1689 | spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT; | |
1690 | spec->tv_nsec = packed_time & OCFS2_NSEC_MASK; | |
1691 | } | |
1692 | ||
1693 | static void ocfs2_refresh_inode_from_lvb(struct inode *inode) | |
1694 | { | |
1695 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
e63aecb6 | 1696 | struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
ccd979bd MF |
1697 | struct ocfs2_meta_lvb *lvb; |
1698 | ||
1699 | mlog_entry_void(); | |
1700 | ||
1701 | mlog_meta_lvb(0, lockres); | |
1702 | ||
1703 | lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; | |
1704 | ||
1705 | /* We're safe here without the lockres lock... */ | |
1706 | spin_lock(&oi->ip_lock); | |
1707 | oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters); | |
1708 | i_size_write(inode, be64_to_cpu(lvb->lvb_isize)); | |
1709 | ||
ca4d147e | 1710 | oi->ip_attr = be32_to_cpu(lvb->lvb_iattr); |
15b1e36b | 1711 | oi->ip_dyn_features = be16_to_cpu(lvb->lvb_idynfeatures); |
ca4d147e HP |
1712 | ocfs2_set_inode_flags(inode); |
1713 | ||
ccd979bd MF |
1714 | /* fast-symlinks are a special case */ |
1715 | if (S_ISLNK(inode->i_mode) && !oi->ip_clusters) | |
1716 | inode->i_blocks = 0; | |
1717 | else | |
8110b073 | 1718 | inode->i_blocks = ocfs2_inode_sector_count(inode); |
ccd979bd MF |
1719 | |
1720 | inode->i_uid = be32_to_cpu(lvb->lvb_iuid); | |
1721 | inode->i_gid = be32_to_cpu(lvb->lvb_igid); | |
1722 | inode->i_mode = be16_to_cpu(lvb->lvb_imode); | |
1723 | inode->i_nlink = be16_to_cpu(lvb->lvb_inlink); | |
1724 | ocfs2_unpack_timespec(&inode->i_atime, | |
1725 | be64_to_cpu(lvb->lvb_iatime_packed)); | |
1726 | ocfs2_unpack_timespec(&inode->i_mtime, | |
1727 | be64_to_cpu(lvb->lvb_imtime_packed)); | |
1728 | ocfs2_unpack_timespec(&inode->i_ctime, | |
1729 | be64_to_cpu(lvb->lvb_ictime_packed)); | |
1730 | spin_unlock(&oi->ip_lock); | |
1731 | ||
1732 | mlog_exit_void(); | |
1733 | } | |
1734 | ||
f9e2d82e MF |
1735 | static inline int ocfs2_meta_lvb_is_trustable(struct inode *inode, |
1736 | struct ocfs2_lock_res *lockres) | |
ccd979bd MF |
1737 | { |
1738 | struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; | |
1739 | ||
f9e2d82e MF |
1740 | if (lvb->lvb_version == OCFS2_LVB_VERSION |
1741 | && be32_to_cpu(lvb->lvb_igeneration) == inode->i_generation) | |
ccd979bd MF |
1742 | return 1; |
1743 | return 0; | |
1744 | } | |
1745 | ||
1746 | /* Determine whether a lock resource needs to be refreshed, and | |
1747 | * arbitrate who gets to refresh it. | |
1748 | * | |
1749 | * 0 means no refresh needed. | |
1750 | * | |
1751 | * > 0 means you need to refresh this and you MUST call | |
1752 | * ocfs2_complete_lock_res_refresh afterwards. */ | |
1753 | static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres) | |
1754 | { | |
1755 | unsigned long flags; | |
1756 | int status = 0; | |
1757 | ||
1758 | mlog_entry_void(); | |
1759 | ||
1760 | refresh_check: | |
1761 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1762 | if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) { | |
1763 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1764 | goto bail; | |
1765 | } | |
1766 | ||
1767 | if (lockres->l_flags & OCFS2_LOCK_REFRESHING) { | |
1768 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1769 | ||
1770 | ocfs2_wait_on_refreshing_lock(lockres); | |
1771 | goto refresh_check; | |
1772 | } | |
1773 | ||
1774 | /* Ok, I'll be the one to refresh this lock. */ | |
1775 | lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING); | |
1776 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1777 | ||
1778 | status = 1; | |
1779 | bail: | |
1780 | mlog_exit(status); | |
1781 | return status; | |
1782 | } | |
1783 | ||
1784 | /* If status is non zero, I'll mark it as not being in refresh | |
1785 | * anymroe, but i won't clear the needs refresh flag. */ | |
1786 | static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres, | |
1787 | int status) | |
1788 | { | |
1789 | unsigned long flags; | |
1790 | mlog_entry_void(); | |
1791 | ||
1792 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1793 | lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING); | |
1794 | if (!status) | |
1795 | lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); | |
1796 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1797 | ||
1798 | wake_up(&lockres->l_event); | |
1799 | ||
1800 | mlog_exit_void(); | |
1801 | } | |
1802 | ||
1803 | /* may or may not return a bh if it went to disk. */ | |
e63aecb6 | 1804 | static int ocfs2_inode_lock_update(struct inode *inode, |
ccd979bd MF |
1805 | struct buffer_head **bh) |
1806 | { | |
1807 | int status = 0; | |
1808 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
e63aecb6 | 1809 | struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
ccd979bd | 1810 | struct ocfs2_dinode *fe; |
c271c5c2 | 1811 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
1812 | |
1813 | mlog_entry_void(); | |
1814 | ||
be9e986b MF |
1815 | if (ocfs2_mount_local(osb)) |
1816 | goto bail; | |
1817 | ||
ccd979bd MF |
1818 | spin_lock(&oi->ip_lock); |
1819 | if (oi->ip_flags & OCFS2_INODE_DELETED) { | |
b0697053 | 1820 | mlog(0, "Orphaned inode %llu was deleted while we " |
ccd979bd | 1821 | "were waiting on a lock. ip_flags = 0x%x\n", |
b0697053 | 1822 | (unsigned long long)oi->ip_blkno, oi->ip_flags); |
ccd979bd MF |
1823 | spin_unlock(&oi->ip_lock); |
1824 | status = -ENOENT; | |
1825 | goto bail; | |
1826 | } | |
1827 | spin_unlock(&oi->ip_lock); | |
1828 | ||
be9e986b MF |
1829 | if (!ocfs2_should_refresh_lock_res(lockres)) |
1830 | goto bail; | |
ccd979bd MF |
1831 | |
1832 | /* This will discard any caching information we might have had | |
1833 | * for the inode metadata. */ | |
1834 | ocfs2_metadata_cache_purge(inode); | |
1835 | ||
83418978 MF |
1836 | ocfs2_extent_map_trunc(inode, 0); |
1837 | ||
be9e986b | 1838 | if (ocfs2_meta_lvb_is_trustable(inode, lockres)) { |
b0697053 MF |
1839 | mlog(0, "Trusting LVB on inode %llu\n", |
1840 | (unsigned long long)oi->ip_blkno); | |
ccd979bd MF |
1841 | ocfs2_refresh_inode_from_lvb(inode); |
1842 | } else { | |
1843 | /* Boo, we have to go to disk. */ | |
1844 | /* read bh, cast, ocfs2_refresh_inode */ | |
1845 | status = ocfs2_read_block(OCFS2_SB(inode->i_sb), oi->ip_blkno, | |
1846 | bh, OCFS2_BH_CACHED, inode); | |
1847 | if (status < 0) { | |
1848 | mlog_errno(status); | |
1849 | goto bail_refresh; | |
1850 | } | |
1851 | fe = (struct ocfs2_dinode *) (*bh)->b_data; | |
1852 | ||
1853 | /* This is a good chance to make sure we're not | |
1854 | * locking an invalid object. | |
1855 | * | |
1856 | * We bug on a stale inode here because we checked | |
1857 | * above whether it was wiped from disk. The wiping | |
1858 | * node provides a guarantee that we receive that | |
1859 | * message and can mark the inode before dropping any | |
1860 | * locks associated with it. */ | |
1861 | if (!OCFS2_IS_VALID_DINODE(fe)) { | |
1862 | OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); | |
1863 | status = -EIO; | |
1864 | goto bail_refresh; | |
1865 | } | |
1866 | mlog_bug_on_msg(inode->i_generation != | |
1867 | le32_to_cpu(fe->i_generation), | |
b0697053 | 1868 | "Invalid dinode %llu disk generation: %u " |
ccd979bd | 1869 | "inode->i_generation: %u\n", |
b0697053 MF |
1870 | (unsigned long long)oi->ip_blkno, |
1871 | le32_to_cpu(fe->i_generation), | |
ccd979bd MF |
1872 | inode->i_generation); |
1873 | mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) || | |
1874 | !(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)), | |
b0697053 MF |
1875 | "Stale dinode %llu dtime: %llu flags: 0x%x\n", |
1876 | (unsigned long long)oi->ip_blkno, | |
1877 | (unsigned long long)le64_to_cpu(fe->i_dtime), | |
ccd979bd MF |
1878 | le32_to_cpu(fe->i_flags)); |
1879 | ||
1880 | ocfs2_refresh_inode(inode, fe); | |
1881 | } | |
1882 | ||
1883 | status = 0; | |
1884 | bail_refresh: | |
be9e986b | 1885 | ocfs2_complete_lock_res_refresh(lockres, status); |
ccd979bd MF |
1886 | bail: |
1887 | mlog_exit(status); | |
1888 | return status; | |
1889 | } | |
1890 | ||
1891 | static int ocfs2_assign_bh(struct inode *inode, | |
1892 | struct buffer_head **ret_bh, | |
1893 | struct buffer_head *passed_bh) | |
1894 | { | |
1895 | int status; | |
1896 | ||
1897 | if (passed_bh) { | |
1898 | /* Ok, the update went to disk for us, use the | |
1899 | * returned bh. */ | |
1900 | *ret_bh = passed_bh; | |
1901 | get_bh(*ret_bh); | |
1902 | ||
1903 | return 0; | |
1904 | } | |
1905 | ||
1906 | status = ocfs2_read_block(OCFS2_SB(inode->i_sb), | |
1907 | OCFS2_I(inode)->ip_blkno, | |
1908 | ret_bh, | |
1909 | OCFS2_BH_CACHED, | |
1910 | inode); | |
1911 | if (status < 0) | |
1912 | mlog_errno(status); | |
1913 | ||
1914 | return status; | |
1915 | } | |
1916 | ||
1917 | /* | |
1918 | * returns < 0 error if the callback will never be called, otherwise | |
1919 | * the result of the lock will be communicated via the callback. | |
1920 | */ | |
e63aecb6 | 1921 | int ocfs2_inode_lock_full(struct inode *inode, |
ccd979bd MF |
1922 | struct buffer_head **ret_bh, |
1923 | int ex, | |
1924 | int arg_flags) | |
1925 | { | |
1926 | int status, level, dlm_flags, acquired; | |
c271c5c2 | 1927 | struct ocfs2_lock_res *lockres = NULL; |
ccd979bd MF |
1928 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
1929 | struct buffer_head *local_bh = NULL; | |
1930 | ||
1931 | BUG_ON(!inode); | |
1932 | ||
1933 | mlog_entry_void(); | |
1934 | ||
b0697053 MF |
1935 | mlog(0, "inode %llu, take %s META lock\n", |
1936 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1937 | ex ? "EXMODE" : "PRMODE"); |
1938 | ||
1939 | status = 0; | |
1940 | acquired = 0; | |
1941 | /* We'll allow faking a readonly metadata lock for | |
1942 | * rodevices. */ | |
1943 | if (ocfs2_is_hard_readonly(osb)) { | |
1944 | if (ex) | |
1945 | status = -EROFS; | |
1946 | goto bail; | |
1947 | } | |
1948 | ||
c271c5c2 SM |
1949 | if (ocfs2_mount_local(osb)) |
1950 | goto local; | |
1951 | ||
ccd979bd MF |
1952 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) |
1953 | wait_event(osb->recovery_event, | |
1954 | ocfs2_node_map_is_empty(osb, &osb->recovery_map)); | |
1955 | ||
e63aecb6 | 1956 | lockres = &OCFS2_I(inode)->ip_inode_lockres; |
ccd979bd MF |
1957 | level = ex ? LKM_EXMODE : LKM_PRMODE; |
1958 | dlm_flags = 0; | |
1959 | if (arg_flags & OCFS2_META_LOCK_NOQUEUE) | |
1960 | dlm_flags |= LKM_NOQUEUE; | |
1961 | ||
1962 | status = ocfs2_cluster_lock(osb, lockres, level, dlm_flags, arg_flags); | |
1963 | if (status < 0) { | |
1964 | if (status != -EAGAIN && status != -EIOCBRETRY) | |
1965 | mlog_errno(status); | |
1966 | goto bail; | |
1967 | } | |
1968 | ||
1969 | /* Notify the error cleanup path to drop the cluster lock. */ | |
1970 | acquired = 1; | |
1971 | ||
1972 | /* We wait twice because a node may have died while we were in | |
1973 | * the lower dlm layers. The second time though, we've | |
1974 | * committed to owning this lock so we don't allow signals to | |
1975 | * abort the operation. */ | |
1976 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) | |
1977 | wait_event(osb->recovery_event, | |
1978 | ocfs2_node_map_is_empty(osb, &osb->recovery_map)); | |
1979 | ||
c271c5c2 | 1980 | local: |
24c19ef4 MF |
1981 | /* |
1982 | * We only see this flag if we're being called from | |
1983 | * ocfs2_read_locked_inode(). It means we're locking an inode | |
1984 | * which hasn't been populated yet, so clear the refresh flag | |
1985 | * and let the caller handle it. | |
1986 | */ | |
1987 | if (inode->i_state & I_NEW) { | |
1988 | status = 0; | |
c271c5c2 SM |
1989 | if (lockres) |
1990 | ocfs2_complete_lock_res_refresh(lockres, 0); | |
24c19ef4 MF |
1991 | goto bail; |
1992 | } | |
1993 | ||
ccd979bd | 1994 | /* This is fun. The caller may want a bh back, or it may |
e63aecb6 | 1995 | * not. ocfs2_inode_lock_update definitely wants one in, but |
ccd979bd MF |
1996 | * may or may not read one, depending on what's in the |
1997 | * LVB. The result of all of this is that we've *only* gone to | |
1998 | * disk if we have to, so the complexity is worthwhile. */ | |
e63aecb6 | 1999 | status = ocfs2_inode_lock_update(inode, &local_bh); |
ccd979bd MF |
2000 | if (status < 0) { |
2001 | if (status != -ENOENT) | |
2002 | mlog_errno(status); | |
2003 | goto bail; | |
2004 | } | |
2005 | ||
2006 | if (ret_bh) { | |
2007 | status = ocfs2_assign_bh(inode, ret_bh, local_bh); | |
2008 | if (status < 0) { | |
2009 | mlog_errno(status); | |
2010 | goto bail; | |
2011 | } | |
2012 | } | |
2013 | ||
ccd979bd MF |
2014 | bail: |
2015 | if (status < 0) { | |
2016 | if (ret_bh && (*ret_bh)) { | |
2017 | brelse(*ret_bh); | |
2018 | *ret_bh = NULL; | |
2019 | } | |
2020 | if (acquired) | |
e63aecb6 | 2021 | ocfs2_inode_unlock(inode, ex); |
ccd979bd MF |
2022 | } |
2023 | ||
2024 | if (local_bh) | |
2025 | brelse(local_bh); | |
2026 | ||
2027 | mlog_exit(status); | |
2028 | return status; | |
2029 | } | |
2030 | ||
2031 | /* | |
34d024f8 MF |
2032 | * This is working around a lock inversion between tasks acquiring DLM |
2033 | * locks while holding a page lock and the downconvert thread which | |
2034 | * blocks dlm lock acquiry while acquiring page locks. | |
ccd979bd MF |
2035 | * |
2036 | * ** These _with_page variantes are only intended to be called from aop | |
2037 | * methods that hold page locks and return a very specific *positive* error | |
2038 | * code that aop methods pass up to the VFS -- test for errors with != 0. ** | |
2039 | * | |
34d024f8 MF |
2040 | * The DLM is called such that it returns -EAGAIN if it would have |
2041 | * blocked waiting for the downconvert thread. In that case we unlock | |
2042 | * our page so the downconvert thread can make progress. Once we've | |
2043 | * done this we have to return AOP_TRUNCATED_PAGE so the aop method | |
2044 | * that called us can bubble that back up into the VFS who will then | |
2045 | * immediately retry the aop call. | |
ccd979bd MF |
2046 | * |
2047 | * We do a blocking lock and immediate unlock before returning, though, so that | |
2048 | * the lock has a great chance of being cached on this node by the time the VFS | |
2049 | * calls back to retry the aop. This has a potential to livelock as nodes | |
2050 | * ping locks back and forth, but that's a risk we're willing to take to avoid | |
2051 | * the lock inversion simply. | |
2052 | */ | |
e63aecb6 | 2053 | int ocfs2_inode_lock_with_page(struct inode *inode, |
ccd979bd MF |
2054 | struct buffer_head **ret_bh, |
2055 | int ex, | |
2056 | struct page *page) | |
2057 | { | |
2058 | int ret; | |
2059 | ||
e63aecb6 | 2060 | ret = ocfs2_inode_lock_full(inode, ret_bh, ex, OCFS2_LOCK_NONBLOCK); |
ccd979bd MF |
2061 | if (ret == -EAGAIN) { |
2062 | unlock_page(page); | |
e63aecb6 MF |
2063 | if (ocfs2_inode_lock(inode, ret_bh, ex) == 0) |
2064 | ocfs2_inode_unlock(inode, ex); | |
ccd979bd MF |
2065 | ret = AOP_TRUNCATED_PAGE; |
2066 | } | |
2067 | ||
2068 | return ret; | |
2069 | } | |
2070 | ||
e63aecb6 | 2071 | int ocfs2_inode_lock_atime(struct inode *inode, |
7f1a37e3 TY |
2072 | struct vfsmount *vfsmnt, |
2073 | int *level) | |
2074 | { | |
2075 | int ret; | |
2076 | ||
2077 | mlog_entry_void(); | |
e63aecb6 | 2078 | ret = ocfs2_inode_lock(inode, NULL, 0); |
7f1a37e3 TY |
2079 | if (ret < 0) { |
2080 | mlog_errno(ret); | |
2081 | return ret; | |
2082 | } | |
2083 | ||
2084 | /* | |
2085 | * If we should update atime, we will get EX lock, | |
2086 | * otherwise we just get PR lock. | |
2087 | */ | |
2088 | if (ocfs2_should_update_atime(inode, vfsmnt)) { | |
2089 | struct buffer_head *bh = NULL; | |
2090 | ||
e63aecb6 MF |
2091 | ocfs2_inode_unlock(inode, 0); |
2092 | ret = ocfs2_inode_lock(inode, &bh, 1); | |
7f1a37e3 TY |
2093 | if (ret < 0) { |
2094 | mlog_errno(ret); | |
2095 | return ret; | |
2096 | } | |
2097 | *level = 1; | |
2098 | if (ocfs2_should_update_atime(inode, vfsmnt)) | |
2099 | ocfs2_update_inode_atime(inode, bh); | |
2100 | if (bh) | |
2101 | brelse(bh); | |
2102 | } else | |
2103 | *level = 0; | |
2104 | ||
2105 | mlog_exit(ret); | |
2106 | return ret; | |
2107 | } | |
2108 | ||
e63aecb6 | 2109 | void ocfs2_inode_unlock(struct inode *inode, |
ccd979bd MF |
2110 | int ex) |
2111 | { | |
2112 | int level = ex ? LKM_EXMODE : LKM_PRMODE; | |
e63aecb6 | 2113 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_inode_lockres; |
c271c5c2 | 2114 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
2115 | |
2116 | mlog_entry_void(); | |
2117 | ||
b0697053 MF |
2118 | mlog(0, "inode %llu drop %s META lock\n", |
2119 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
2120 | ex ? "EXMODE" : "PRMODE"); |
2121 | ||
c271c5c2 SM |
2122 | if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)) && |
2123 | !ocfs2_mount_local(osb)) | |
ccd979bd MF |
2124 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); |
2125 | ||
2126 | mlog_exit_void(); | |
2127 | } | |
2128 | ||
2129 | int ocfs2_super_lock(struct ocfs2_super *osb, | |
2130 | int ex) | |
2131 | { | |
c271c5c2 | 2132 | int status = 0; |
ccd979bd MF |
2133 | int level = ex ? LKM_EXMODE : LKM_PRMODE; |
2134 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; | |
2135 | struct buffer_head *bh; | |
2136 | struct ocfs2_slot_info *si = osb->slot_info; | |
2137 | ||
2138 | mlog_entry_void(); | |
2139 | ||
2140 | if (ocfs2_is_hard_readonly(osb)) | |
2141 | return -EROFS; | |
2142 | ||
c271c5c2 SM |
2143 | if (ocfs2_mount_local(osb)) |
2144 | goto bail; | |
2145 | ||
ccd979bd MF |
2146 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); |
2147 | if (status < 0) { | |
2148 | mlog_errno(status); | |
2149 | goto bail; | |
2150 | } | |
2151 | ||
2152 | /* The super block lock path is really in the best position to | |
2153 | * know when resources covered by the lock need to be | |
2154 | * refreshed, so we do it here. Of course, making sense of | |
2155 | * everything is up to the caller :) */ | |
2156 | status = ocfs2_should_refresh_lock_res(lockres); | |
2157 | if (status < 0) { | |
2158 | mlog_errno(status); | |
2159 | goto bail; | |
2160 | } | |
2161 | if (status) { | |
2162 | bh = si->si_bh; | |
2163 | status = ocfs2_read_block(osb, bh->b_blocknr, &bh, 0, | |
2164 | si->si_inode); | |
2165 | if (status == 0) | |
2166 | ocfs2_update_slot_info(si); | |
2167 | ||
2168 | ocfs2_complete_lock_res_refresh(lockres, status); | |
2169 | ||
2170 | if (status < 0) | |
2171 | mlog_errno(status); | |
2172 | } | |
2173 | bail: | |
2174 | mlog_exit(status); | |
2175 | return status; | |
2176 | } | |
2177 | ||
2178 | void ocfs2_super_unlock(struct ocfs2_super *osb, | |
2179 | int ex) | |
2180 | { | |
2181 | int level = ex ? LKM_EXMODE : LKM_PRMODE; | |
2182 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; | |
2183 | ||
c271c5c2 SM |
2184 | if (!ocfs2_mount_local(osb)) |
2185 | ocfs2_cluster_unlock(osb, lockres, level); | |
ccd979bd MF |
2186 | } |
2187 | ||
2188 | int ocfs2_rename_lock(struct ocfs2_super *osb) | |
2189 | { | |
2190 | int status; | |
2191 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; | |
2192 | ||
2193 | if (ocfs2_is_hard_readonly(osb)) | |
2194 | return -EROFS; | |
2195 | ||
c271c5c2 SM |
2196 | if (ocfs2_mount_local(osb)) |
2197 | return 0; | |
2198 | ||
ccd979bd MF |
2199 | status = ocfs2_cluster_lock(osb, lockres, LKM_EXMODE, 0, 0); |
2200 | if (status < 0) | |
2201 | mlog_errno(status); | |
2202 | ||
2203 | return status; | |
2204 | } | |
2205 | ||
2206 | void ocfs2_rename_unlock(struct ocfs2_super *osb) | |
2207 | { | |
2208 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; | |
2209 | ||
c271c5c2 SM |
2210 | if (!ocfs2_mount_local(osb)) |
2211 | ocfs2_cluster_unlock(osb, lockres, LKM_EXMODE); | |
ccd979bd MF |
2212 | } |
2213 | ||
d680efe9 MF |
2214 | int ocfs2_dentry_lock(struct dentry *dentry, int ex) |
2215 | { | |
2216 | int ret; | |
2217 | int level = ex ? LKM_EXMODE : LKM_PRMODE; | |
2218 | struct ocfs2_dentry_lock *dl = dentry->d_fsdata; | |
2219 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); | |
2220 | ||
2221 | BUG_ON(!dl); | |
2222 | ||
2223 | if (ocfs2_is_hard_readonly(osb)) | |
2224 | return -EROFS; | |
2225 | ||
c271c5c2 SM |
2226 | if (ocfs2_mount_local(osb)) |
2227 | return 0; | |
2228 | ||
d680efe9 MF |
2229 | ret = ocfs2_cluster_lock(osb, &dl->dl_lockres, level, 0, 0); |
2230 | if (ret < 0) | |
2231 | mlog_errno(ret); | |
2232 | ||
2233 | return ret; | |
2234 | } | |
2235 | ||
2236 | void ocfs2_dentry_unlock(struct dentry *dentry, int ex) | |
2237 | { | |
2238 | int level = ex ? LKM_EXMODE : LKM_PRMODE; | |
2239 | struct ocfs2_dentry_lock *dl = dentry->d_fsdata; | |
2240 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); | |
2241 | ||
c271c5c2 SM |
2242 | if (!ocfs2_mount_local(osb)) |
2243 | ocfs2_cluster_unlock(osb, &dl->dl_lockres, level); | |
d680efe9 MF |
2244 | } |
2245 | ||
ccd979bd MF |
2246 | /* Reference counting of the dlm debug structure. We want this because |
2247 | * open references on the debug inodes can live on after a mount, so | |
2248 | * we can't rely on the ocfs2_super to always exist. */ | |
2249 | static void ocfs2_dlm_debug_free(struct kref *kref) | |
2250 | { | |
2251 | struct ocfs2_dlm_debug *dlm_debug; | |
2252 | ||
2253 | dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt); | |
2254 | ||
2255 | kfree(dlm_debug); | |
2256 | } | |
2257 | ||
2258 | void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug) | |
2259 | { | |
2260 | if (dlm_debug) | |
2261 | kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free); | |
2262 | } | |
2263 | ||
2264 | static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug) | |
2265 | { | |
2266 | kref_get(&debug->d_refcnt); | |
2267 | } | |
2268 | ||
2269 | struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void) | |
2270 | { | |
2271 | struct ocfs2_dlm_debug *dlm_debug; | |
2272 | ||
2273 | dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL); | |
2274 | if (!dlm_debug) { | |
2275 | mlog_errno(-ENOMEM); | |
2276 | goto out; | |
2277 | } | |
2278 | ||
2279 | kref_init(&dlm_debug->d_refcnt); | |
2280 | INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking); | |
2281 | dlm_debug->d_locking_state = NULL; | |
2282 | out: | |
2283 | return dlm_debug; | |
2284 | } | |
2285 | ||
2286 | /* Access to this is arbitrated for us via seq_file->sem. */ | |
2287 | struct ocfs2_dlm_seq_priv { | |
2288 | struct ocfs2_dlm_debug *p_dlm_debug; | |
2289 | struct ocfs2_lock_res p_iter_res; | |
2290 | struct ocfs2_lock_res p_tmp_res; | |
2291 | }; | |
2292 | ||
2293 | static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start, | |
2294 | struct ocfs2_dlm_seq_priv *priv) | |
2295 | { | |
2296 | struct ocfs2_lock_res *iter, *ret = NULL; | |
2297 | struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug; | |
2298 | ||
2299 | assert_spin_locked(&ocfs2_dlm_tracking_lock); | |
2300 | ||
2301 | list_for_each_entry(iter, &start->l_debug_list, l_debug_list) { | |
2302 | /* discover the head of the list */ | |
2303 | if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) { | |
2304 | mlog(0, "End of list found, %p\n", ret); | |
2305 | break; | |
2306 | } | |
2307 | ||
2308 | /* We track our "dummy" iteration lockres' by a NULL | |
2309 | * l_ops field. */ | |
2310 | if (iter->l_ops != NULL) { | |
2311 | ret = iter; | |
2312 | break; | |
2313 | } | |
2314 | } | |
2315 | ||
2316 | return ret; | |
2317 | } | |
2318 | ||
2319 | static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos) | |
2320 | { | |
2321 | struct ocfs2_dlm_seq_priv *priv = m->private; | |
2322 | struct ocfs2_lock_res *iter; | |
2323 | ||
2324 | spin_lock(&ocfs2_dlm_tracking_lock); | |
2325 | iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv); | |
2326 | if (iter) { | |
2327 | /* Since lockres' have the lifetime of their container | |
2328 | * (which can be inodes, ocfs2_supers, etc) we want to | |
2329 | * copy this out to a temporary lockres while still | |
2330 | * under the spinlock. Obviously after this we can't | |
2331 | * trust any pointers on the copy returned, but that's | |
2332 | * ok as the information we want isn't typically held | |
2333 | * in them. */ | |
2334 | priv->p_tmp_res = *iter; | |
2335 | iter = &priv->p_tmp_res; | |
2336 | } | |
2337 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
2338 | ||
2339 | return iter; | |
2340 | } | |
2341 | ||
2342 | static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v) | |
2343 | { | |
2344 | } | |
2345 | ||
2346 | static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
2347 | { | |
2348 | struct ocfs2_dlm_seq_priv *priv = m->private; | |
2349 | struct ocfs2_lock_res *iter = v; | |
2350 | struct ocfs2_lock_res *dummy = &priv->p_iter_res; | |
2351 | ||
2352 | spin_lock(&ocfs2_dlm_tracking_lock); | |
2353 | iter = ocfs2_dlm_next_res(iter, priv); | |
2354 | list_del_init(&dummy->l_debug_list); | |
2355 | if (iter) { | |
2356 | list_add(&dummy->l_debug_list, &iter->l_debug_list); | |
2357 | priv->p_tmp_res = *iter; | |
2358 | iter = &priv->p_tmp_res; | |
2359 | } | |
2360 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
2361 | ||
2362 | return iter; | |
2363 | } | |
2364 | ||
2365 | /* So that debugfs.ocfs2 can determine which format is being used */ | |
2366 | #define OCFS2_DLM_DEBUG_STR_VERSION 1 | |
2367 | static int ocfs2_dlm_seq_show(struct seq_file *m, void *v) | |
2368 | { | |
2369 | int i; | |
2370 | char *lvb; | |
2371 | struct ocfs2_lock_res *lockres = v; | |
2372 | ||
2373 | if (!lockres) | |
2374 | return -EINVAL; | |
2375 | ||
d680efe9 MF |
2376 | seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION); |
2377 | ||
2378 | if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY) | |
2379 | seq_printf(m, "%.*s%08x\t", OCFS2_DENTRY_LOCK_INO_START - 1, | |
2380 | lockres->l_name, | |
2381 | (unsigned int)ocfs2_get_dentry_lock_ino(lockres)); | |
2382 | else | |
2383 | seq_printf(m, "%.*s\t", OCFS2_LOCK_ID_MAX_LEN, lockres->l_name); | |
2384 | ||
2385 | seq_printf(m, "%d\t" | |
ccd979bd MF |
2386 | "0x%lx\t" |
2387 | "0x%x\t" | |
2388 | "0x%x\t" | |
2389 | "%u\t" | |
2390 | "%u\t" | |
2391 | "%d\t" | |
2392 | "%d\t", | |
ccd979bd MF |
2393 | lockres->l_level, |
2394 | lockres->l_flags, | |
2395 | lockres->l_action, | |
2396 | lockres->l_unlock_action, | |
2397 | lockres->l_ro_holders, | |
2398 | lockres->l_ex_holders, | |
2399 | lockres->l_requested, | |
2400 | lockres->l_blocking); | |
2401 | ||
2402 | /* Dump the raw LVB */ | |
2403 | lvb = lockres->l_lksb.lvb; | |
2404 | for(i = 0; i < DLM_LVB_LEN; i++) | |
2405 | seq_printf(m, "0x%x\t", lvb[i]); | |
2406 | ||
2407 | /* End the line */ | |
2408 | seq_printf(m, "\n"); | |
2409 | return 0; | |
2410 | } | |
2411 | ||
90d99779 | 2412 | static const struct seq_operations ocfs2_dlm_seq_ops = { |
ccd979bd MF |
2413 | .start = ocfs2_dlm_seq_start, |
2414 | .stop = ocfs2_dlm_seq_stop, | |
2415 | .next = ocfs2_dlm_seq_next, | |
2416 | .show = ocfs2_dlm_seq_show, | |
2417 | }; | |
2418 | ||
2419 | static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file) | |
2420 | { | |
2421 | struct seq_file *seq = (struct seq_file *) file->private_data; | |
2422 | struct ocfs2_dlm_seq_priv *priv = seq->private; | |
2423 | struct ocfs2_lock_res *res = &priv->p_iter_res; | |
2424 | ||
2425 | ocfs2_remove_lockres_tracking(res); | |
2426 | ocfs2_put_dlm_debug(priv->p_dlm_debug); | |
2427 | return seq_release_private(inode, file); | |
2428 | } | |
2429 | ||
2430 | static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file) | |
2431 | { | |
2432 | int ret; | |
2433 | struct ocfs2_dlm_seq_priv *priv; | |
2434 | struct seq_file *seq; | |
2435 | struct ocfs2_super *osb; | |
2436 | ||
2437 | priv = kzalloc(sizeof(struct ocfs2_dlm_seq_priv), GFP_KERNEL); | |
2438 | if (!priv) { | |
2439 | ret = -ENOMEM; | |
2440 | mlog_errno(ret); | |
2441 | goto out; | |
2442 | } | |
8e18e294 | 2443 | osb = inode->i_private; |
ccd979bd MF |
2444 | ocfs2_get_dlm_debug(osb->osb_dlm_debug); |
2445 | priv->p_dlm_debug = osb->osb_dlm_debug; | |
2446 | INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list); | |
2447 | ||
2448 | ret = seq_open(file, &ocfs2_dlm_seq_ops); | |
2449 | if (ret) { | |
2450 | kfree(priv); | |
2451 | mlog_errno(ret); | |
2452 | goto out; | |
2453 | } | |
2454 | ||
2455 | seq = (struct seq_file *) file->private_data; | |
2456 | seq->private = priv; | |
2457 | ||
2458 | ocfs2_add_lockres_tracking(&priv->p_iter_res, | |
2459 | priv->p_dlm_debug); | |
2460 | ||
2461 | out: | |
2462 | return ret; | |
2463 | } | |
2464 | ||
4b6f5d20 | 2465 | static const struct file_operations ocfs2_dlm_debug_fops = { |
ccd979bd MF |
2466 | .open = ocfs2_dlm_debug_open, |
2467 | .release = ocfs2_dlm_debug_release, | |
2468 | .read = seq_read, | |
2469 | .llseek = seq_lseek, | |
2470 | }; | |
2471 | ||
2472 | static int ocfs2_dlm_init_debug(struct ocfs2_super *osb) | |
2473 | { | |
2474 | int ret = 0; | |
2475 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; | |
2476 | ||
2477 | dlm_debug->d_locking_state = debugfs_create_file("locking_state", | |
2478 | S_IFREG|S_IRUSR, | |
2479 | osb->osb_debug_root, | |
2480 | osb, | |
2481 | &ocfs2_dlm_debug_fops); | |
2482 | if (!dlm_debug->d_locking_state) { | |
2483 | ret = -EINVAL; | |
2484 | mlog(ML_ERROR, | |
2485 | "Unable to create locking state debugfs file.\n"); | |
2486 | goto out; | |
2487 | } | |
2488 | ||
2489 | ocfs2_get_dlm_debug(dlm_debug); | |
2490 | out: | |
2491 | return ret; | |
2492 | } | |
2493 | ||
2494 | static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb) | |
2495 | { | |
2496 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; | |
2497 | ||
2498 | if (dlm_debug) { | |
2499 | debugfs_remove(dlm_debug->d_locking_state); | |
2500 | ocfs2_put_dlm_debug(dlm_debug); | |
2501 | } | |
2502 | } | |
2503 | ||
2504 | int ocfs2_dlm_init(struct ocfs2_super *osb) | |
2505 | { | |
c271c5c2 | 2506 | int status = 0; |
ccd979bd | 2507 | u32 dlm_key; |
c271c5c2 | 2508 | struct dlm_ctxt *dlm = NULL; |
ccd979bd MF |
2509 | |
2510 | mlog_entry_void(); | |
2511 | ||
c271c5c2 SM |
2512 | if (ocfs2_mount_local(osb)) |
2513 | goto local; | |
2514 | ||
ccd979bd MF |
2515 | status = ocfs2_dlm_init_debug(osb); |
2516 | if (status < 0) { | |
2517 | mlog_errno(status); | |
2518 | goto bail; | |
2519 | } | |
2520 | ||
34d024f8 MF |
2521 | /* launch downconvert thread */ |
2522 | osb->dc_task = kthread_run(ocfs2_downconvert_thread, osb, "ocfs2dc"); | |
2523 | if (IS_ERR(osb->dc_task)) { | |
2524 | status = PTR_ERR(osb->dc_task); | |
2525 | osb->dc_task = NULL; | |
ccd979bd MF |
2526 | mlog_errno(status); |
2527 | goto bail; | |
2528 | } | |
2529 | ||
2530 | /* used by the dlm code to make message headers unique, each | |
2531 | * node in this domain must agree on this. */ | |
2532 | dlm_key = crc32_le(0, osb->uuid_str, strlen(osb->uuid_str)); | |
2533 | ||
2534 | /* for now, uuid == domain */ | |
d24fbcda JB |
2535 | dlm = dlm_register_domain(osb->uuid_str, dlm_key, |
2536 | &osb->osb_locking_proto); | |
ccd979bd MF |
2537 | if (IS_ERR(dlm)) { |
2538 | status = PTR_ERR(dlm); | |
2539 | mlog_errno(status); | |
2540 | goto bail; | |
2541 | } | |
2542 | ||
c271c5c2 SM |
2543 | dlm_register_eviction_cb(dlm, &osb->osb_eviction_cb); |
2544 | ||
2545 | local: | |
ccd979bd MF |
2546 | ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb); |
2547 | ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb); | |
2548 | ||
ccd979bd MF |
2549 | osb->dlm = dlm; |
2550 | ||
2551 | status = 0; | |
2552 | bail: | |
2553 | if (status < 0) { | |
2554 | ocfs2_dlm_shutdown_debug(osb); | |
34d024f8 MF |
2555 | if (osb->dc_task) |
2556 | kthread_stop(osb->dc_task); | |
ccd979bd MF |
2557 | } |
2558 | ||
2559 | mlog_exit(status); | |
2560 | return status; | |
2561 | } | |
2562 | ||
2563 | void ocfs2_dlm_shutdown(struct ocfs2_super *osb) | |
2564 | { | |
2565 | mlog_entry_void(); | |
2566 | ||
2567 | dlm_unregister_eviction_cb(&osb->osb_eviction_cb); | |
2568 | ||
2569 | ocfs2_drop_osb_locks(osb); | |
2570 | ||
34d024f8 MF |
2571 | if (osb->dc_task) { |
2572 | kthread_stop(osb->dc_task); | |
2573 | osb->dc_task = NULL; | |
ccd979bd MF |
2574 | } |
2575 | ||
2576 | ocfs2_lock_res_free(&osb->osb_super_lockres); | |
2577 | ocfs2_lock_res_free(&osb->osb_rename_lockres); | |
2578 | ||
2579 | dlm_unregister_domain(osb->dlm); | |
2580 | osb->dlm = NULL; | |
2581 | ||
2582 | ocfs2_dlm_shutdown_debug(osb); | |
2583 | ||
2584 | mlog_exit_void(); | |
2585 | } | |
2586 | ||
2a45f2d1 | 2587 | static void ocfs2_unlock_ast(void *opaque, enum dlm_status status) |
ccd979bd MF |
2588 | { |
2589 | struct ocfs2_lock_res *lockres = opaque; | |
2590 | unsigned long flags; | |
2591 | ||
2592 | mlog_entry_void(); | |
2593 | ||
2594 | mlog(0, "UNLOCK AST called on lock %s, action = %d\n", lockres->l_name, | |
2595 | lockres->l_unlock_action); | |
2596 | ||
2597 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2598 | /* We tried to cancel a convert request, but it was already | |
2599 | * granted. All we want to do here is clear our unlock | |
2600 | * state. The wake_up call done at the bottom is redundant | |
2601 | * (ocfs2_prepare_cancel_convert doesn't sleep on this) but doesn't | |
2602 | * hurt anything anyway */ | |
2603 | if (status == DLM_CANCELGRANT && | |
2604 | lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { | |
2605 | mlog(0, "Got cancelgrant for %s\n", lockres->l_name); | |
2606 | ||
2607 | /* We don't clear the busy flag in this case as it | |
2608 | * should have been cleared by the ast which the dlm | |
2609 | * has called. */ | |
2610 | goto complete_unlock; | |
2611 | } | |
2612 | ||
2613 | if (status != DLM_NORMAL) { | |
2614 | mlog(ML_ERROR, "Dlm passes status %d for lock %s, " | |
2615 | "unlock_action %d\n", status, lockres->l_name, | |
2616 | lockres->l_unlock_action); | |
2617 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2618 | return; | |
2619 | } | |
2620 | ||
2621 | switch(lockres->l_unlock_action) { | |
2622 | case OCFS2_UNLOCK_CANCEL_CONVERT: | |
2623 | mlog(0, "Cancel convert success for %s\n", lockres->l_name); | |
2624 | lockres->l_action = OCFS2_AST_INVALID; | |
2625 | break; | |
2626 | case OCFS2_UNLOCK_DROP_LOCK: | |
2627 | lockres->l_level = LKM_IVMODE; | |
2628 | break; | |
2629 | default: | |
2630 | BUG(); | |
2631 | } | |
2632 | ||
2633 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
2634 | complete_unlock: | |
2635 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
2636 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2637 | ||
2638 | wake_up(&lockres->l_event); | |
2639 | ||
2640 | mlog_exit_void(); | |
2641 | } | |
2642 | ||
ccd979bd | 2643 | static int ocfs2_drop_lock(struct ocfs2_super *osb, |
0d5dc6c2 | 2644 | struct ocfs2_lock_res *lockres) |
ccd979bd MF |
2645 | { |
2646 | enum dlm_status status; | |
2647 | unsigned long flags; | |
b80fc012 | 2648 | int lkm_flags = 0; |
ccd979bd MF |
2649 | |
2650 | /* We didn't get anywhere near actually using this lockres. */ | |
2651 | if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) | |
2652 | goto out; | |
2653 | ||
b80fc012 MF |
2654 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
2655 | lkm_flags |= LKM_VALBLK; | |
2656 | ||
ccd979bd MF |
2657 | spin_lock_irqsave(&lockres->l_lock, flags); |
2658 | ||
2659 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING), | |
2660 | "lockres %s, flags 0x%lx\n", | |
2661 | lockres->l_name, lockres->l_flags); | |
2662 | ||
2663 | while (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
2664 | mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = " | |
2665 | "%u, unlock_action = %u\n", | |
2666 | lockres->l_name, lockres->l_flags, lockres->l_action, | |
2667 | lockres->l_unlock_action); | |
2668 | ||
2669 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2670 | ||
2671 | /* XXX: Today we just wait on any busy | |
2672 | * locks... Perhaps we need to cancel converts in the | |
2673 | * future? */ | |
2674 | ocfs2_wait_on_busy_lock(lockres); | |
2675 | ||
2676 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2677 | } | |
2678 | ||
0d5dc6c2 MF |
2679 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) { |
2680 | if (lockres->l_flags & OCFS2_LOCK_ATTACHED && | |
2681 | lockres->l_level == LKM_EXMODE && | |
2682 | !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) | |
2683 | lockres->l_ops->set_lvb(lockres); | |
2684 | } | |
ccd979bd MF |
2685 | |
2686 | if (lockres->l_flags & OCFS2_LOCK_BUSY) | |
2687 | mlog(ML_ERROR, "destroying busy lock: \"%s\"\n", | |
2688 | lockres->l_name); | |
2689 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) | |
2690 | mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name); | |
2691 | ||
2692 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { | |
2693 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2694 | goto out; | |
2695 | } | |
2696 | ||
2697 | lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED); | |
2698 | ||
2699 | /* make sure we never get here while waiting for an ast to | |
2700 | * fire. */ | |
2701 | BUG_ON(lockres->l_action != OCFS2_AST_INVALID); | |
2702 | ||
2703 | /* is this necessary? */ | |
2704 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
2705 | lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK; | |
2706 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2707 | ||
2708 | mlog(0, "lock %s\n", lockres->l_name); | |
2709 | ||
b80fc012 | 2710 | status = dlmunlock(osb->dlm, &lockres->l_lksb, lkm_flags, |
2a45f2d1 | 2711 | ocfs2_unlock_ast, lockres); |
ccd979bd MF |
2712 | if (status != DLM_NORMAL) { |
2713 | ocfs2_log_dlm_error("dlmunlock", status, lockres); | |
2714 | mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags); | |
2715 | dlm_print_one_lock(lockres->l_lksb.lockid); | |
2716 | BUG(); | |
2717 | } | |
2718 | mlog(0, "lock %s, successfull return from dlmunlock\n", | |
2719 | lockres->l_name); | |
2720 | ||
2721 | ocfs2_wait_on_busy_lock(lockres); | |
2722 | out: | |
2723 | mlog_exit(0); | |
2724 | return 0; | |
2725 | } | |
2726 | ||
2727 | /* Mark the lockres as being dropped. It will no longer be | |
2728 | * queued if blocking, but we still may have to wait on it | |
34d024f8 | 2729 | * being dequeued from the downconvert thread before we can consider |
ccd979bd MF |
2730 | * it safe to drop. |
2731 | * | |
2732 | * You can *not* attempt to call cluster_lock on this lockres anymore. */ | |
2733 | void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres) | |
2734 | { | |
2735 | int status; | |
2736 | struct ocfs2_mask_waiter mw; | |
2737 | unsigned long flags; | |
2738 | ||
2739 | ocfs2_init_mask_waiter(&mw); | |
2740 | ||
2741 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2742 | lockres->l_flags |= OCFS2_LOCK_FREEING; | |
2743 | while (lockres->l_flags & OCFS2_LOCK_QUEUED) { | |
2744 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0); | |
2745 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2746 | ||
2747 | mlog(0, "Waiting on lockres %s\n", lockres->l_name); | |
2748 | ||
2749 | status = ocfs2_wait_for_mask(&mw); | |
2750 | if (status) | |
2751 | mlog_errno(status); | |
2752 | ||
2753 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2754 | } | |
2755 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2756 | } | |
2757 | ||
d680efe9 MF |
2758 | void ocfs2_simple_drop_lockres(struct ocfs2_super *osb, |
2759 | struct ocfs2_lock_res *lockres) | |
ccd979bd | 2760 | { |
d680efe9 | 2761 | int ret; |
ccd979bd | 2762 | |
d680efe9 | 2763 | ocfs2_mark_lockres_freeing(lockres); |
0d5dc6c2 | 2764 | ret = ocfs2_drop_lock(osb, lockres); |
d680efe9 MF |
2765 | if (ret) |
2766 | mlog_errno(ret); | |
2767 | } | |
ccd979bd | 2768 | |
d680efe9 MF |
2769 | static void ocfs2_drop_osb_locks(struct ocfs2_super *osb) |
2770 | { | |
2771 | ocfs2_simple_drop_lockres(osb, &osb->osb_super_lockres); | |
2772 | ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres); | |
ccd979bd MF |
2773 | } |
2774 | ||
ccd979bd MF |
2775 | int ocfs2_drop_inode_locks(struct inode *inode) |
2776 | { | |
2777 | int status, err; | |
ccd979bd MF |
2778 | |
2779 | mlog_entry_void(); | |
2780 | ||
2781 | /* No need to call ocfs2_mark_lockres_freeing here - | |
2782 | * ocfs2_clear_inode has done it for us. */ | |
2783 | ||
2784 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
50008630 | 2785 | &OCFS2_I(inode)->ip_open_lockres); |
ccd979bd MF |
2786 | if (err < 0) |
2787 | mlog_errno(err); | |
2788 | ||
2789 | status = err; | |
2790 | ||
2791 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
e63aecb6 | 2792 | &OCFS2_I(inode)->ip_inode_lockres); |
ccd979bd MF |
2793 | if (err < 0) |
2794 | mlog_errno(err); | |
2795 | if (err < 0 && !status) | |
2796 | status = err; | |
2797 | ||
2798 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
0d5dc6c2 | 2799 | &OCFS2_I(inode)->ip_rw_lockres); |
ccd979bd MF |
2800 | if (err < 0) |
2801 | mlog_errno(err); | |
2802 | if (err < 0 && !status) | |
2803 | status = err; | |
2804 | ||
2805 | mlog_exit(status); | |
2806 | return status; | |
2807 | } | |
2808 | ||
2809 | static void ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres, | |
2810 | int new_level) | |
2811 | { | |
2812 | assert_spin_locked(&lockres->l_lock); | |
2813 | ||
2814 | BUG_ON(lockres->l_blocking <= LKM_NLMODE); | |
2815 | ||
2816 | if (lockres->l_level <= new_level) { | |
2817 | mlog(ML_ERROR, "lockres->l_level (%u) <= new_level (%u)\n", | |
2818 | lockres->l_level, new_level); | |
2819 | BUG(); | |
2820 | } | |
2821 | ||
2822 | mlog(0, "lock %s, new_level = %d, l_blocking = %d\n", | |
2823 | lockres->l_name, new_level, lockres->l_blocking); | |
2824 | ||
2825 | lockres->l_action = OCFS2_AST_DOWNCONVERT; | |
2826 | lockres->l_requested = new_level; | |
2827 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
2828 | } | |
2829 | ||
2830 | static int ocfs2_downconvert_lock(struct ocfs2_super *osb, | |
2831 | struct ocfs2_lock_res *lockres, | |
2832 | int new_level, | |
2833 | int lvb) | |
2834 | { | |
2835 | int ret, dlm_flags = LKM_CONVERT; | |
2836 | enum dlm_status status; | |
2837 | ||
2838 | mlog_entry_void(); | |
2839 | ||
2840 | if (lvb) | |
2841 | dlm_flags |= LKM_VALBLK; | |
2842 | ||
2843 | status = dlmlock(osb->dlm, | |
2844 | new_level, | |
2845 | &lockres->l_lksb, | |
2846 | dlm_flags, | |
2847 | lockres->l_name, | |
f0681062 | 2848 | OCFS2_LOCK_ID_MAX_LEN - 1, |
e92d57df | 2849 | ocfs2_locking_ast, |
ccd979bd | 2850 | lockres, |
aa2623ad | 2851 | ocfs2_blocking_ast); |
ccd979bd MF |
2852 | if (status != DLM_NORMAL) { |
2853 | ocfs2_log_dlm_error("dlmlock", status, lockres); | |
2854 | ret = -EINVAL; | |
2855 | ocfs2_recover_from_dlm_error(lockres, 1); | |
2856 | goto bail; | |
2857 | } | |
2858 | ||
2859 | ret = 0; | |
2860 | bail: | |
2861 | mlog_exit(ret); | |
2862 | return ret; | |
2863 | } | |
2864 | ||
2865 | /* returns 1 when the caller should unlock and call dlmunlock */ | |
2866 | static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb, | |
2867 | struct ocfs2_lock_res *lockres) | |
2868 | { | |
2869 | assert_spin_locked(&lockres->l_lock); | |
2870 | ||
2871 | mlog_entry_void(); | |
2872 | mlog(0, "lock %s\n", lockres->l_name); | |
2873 | ||
2874 | if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { | |
2875 | /* If we're already trying to cancel a lock conversion | |
2876 | * then just drop the spinlock and allow the caller to | |
2877 | * requeue this lock. */ | |
2878 | ||
2879 | mlog(0, "Lockres %s, skip convert\n", lockres->l_name); | |
2880 | return 0; | |
2881 | } | |
2882 | ||
2883 | /* were we in a convert when we got the bast fire? */ | |
2884 | BUG_ON(lockres->l_action != OCFS2_AST_CONVERT && | |
2885 | lockres->l_action != OCFS2_AST_DOWNCONVERT); | |
2886 | /* set things up for the unlockast to know to just | |
2887 | * clear out the ast_action and unset busy, etc. */ | |
2888 | lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT; | |
2889 | ||
2890 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY), | |
2891 | "lock %s, invalid flags: 0x%lx\n", | |
2892 | lockres->l_name, lockres->l_flags); | |
2893 | ||
2894 | return 1; | |
2895 | } | |
2896 | ||
2897 | static int ocfs2_cancel_convert(struct ocfs2_super *osb, | |
2898 | struct ocfs2_lock_res *lockres) | |
2899 | { | |
2900 | int ret; | |
2901 | enum dlm_status status; | |
2902 | ||
2903 | mlog_entry_void(); | |
2904 | mlog(0, "lock %s\n", lockres->l_name); | |
2905 | ||
2906 | ret = 0; | |
2907 | status = dlmunlock(osb->dlm, | |
2908 | &lockres->l_lksb, | |
2909 | LKM_CANCEL, | |
2a45f2d1 | 2910 | ocfs2_unlock_ast, |
ccd979bd MF |
2911 | lockres); |
2912 | if (status != DLM_NORMAL) { | |
2913 | ocfs2_log_dlm_error("dlmunlock", status, lockres); | |
2914 | ret = -EINVAL; | |
2915 | ocfs2_recover_from_dlm_error(lockres, 0); | |
2916 | } | |
2917 | ||
2918 | mlog(0, "lock %s return from dlmunlock\n", lockres->l_name); | |
2919 | ||
ccd979bd MF |
2920 | mlog_exit(ret); |
2921 | return ret; | |
2922 | } | |
2923 | ||
b5e500e2 MF |
2924 | static int ocfs2_unblock_lock(struct ocfs2_super *osb, |
2925 | struct ocfs2_lock_res *lockres, | |
2926 | struct ocfs2_unblock_ctl *ctl) | |
ccd979bd MF |
2927 | { |
2928 | unsigned long flags; | |
2929 | int blocking; | |
2930 | int new_level; | |
2931 | int ret = 0; | |
5ef0d4ea | 2932 | int set_lvb = 0; |
ccd979bd MF |
2933 | |
2934 | mlog_entry_void(); | |
2935 | ||
2936 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2937 | ||
2938 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
2939 | ||
2940 | recheck: | |
2941 | if (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
d680efe9 | 2942 | ctl->requeue = 1; |
ccd979bd MF |
2943 | ret = ocfs2_prepare_cancel_convert(osb, lockres); |
2944 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2945 | if (ret) { | |
2946 | ret = ocfs2_cancel_convert(osb, lockres); | |
2947 | if (ret < 0) | |
2948 | mlog_errno(ret); | |
2949 | } | |
2950 | goto leave; | |
2951 | } | |
2952 | ||
2953 | /* if we're blocking an exclusive and we have *any* holders, | |
2954 | * then requeue. */ | |
2955 | if ((lockres->l_blocking == LKM_EXMODE) | |
f7fbfdd1 MF |
2956 | && (lockres->l_ex_holders || lockres->l_ro_holders)) |
2957 | goto leave_requeue; | |
ccd979bd MF |
2958 | |
2959 | /* If it's a PR we're blocking, then only | |
2960 | * requeue if we've got any EX holders */ | |
2961 | if (lockres->l_blocking == LKM_PRMODE && | |
f7fbfdd1 MF |
2962 | lockres->l_ex_holders) |
2963 | goto leave_requeue; | |
2964 | ||
2965 | /* | |
2966 | * Can we get a lock in this state if the holder counts are | |
2967 | * zero? The meta data unblock code used to check this. | |
2968 | */ | |
2969 | if ((lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) | |
2970 | && (lockres->l_flags & OCFS2_LOCK_REFRESHING)) | |
2971 | goto leave_requeue; | |
ccd979bd | 2972 | |
16d5b956 MF |
2973 | new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking); |
2974 | ||
2975 | if (lockres->l_ops->check_downconvert | |
2976 | && !lockres->l_ops->check_downconvert(lockres, new_level)) | |
2977 | goto leave_requeue; | |
2978 | ||
ccd979bd MF |
2979 | /* If we get here, then we know that there are no more |
2980 | * incompatible holders (and anyone asking for an incompatible | |
2981 | * lock is blocked). We can now downconvert the lock */ | |
cc567d89 | 2982 | if (!lockres->l_ops->downconvert_worker) |
ccd979bd MF |
2983 | goto downconvert; |
2984 | ||
2985 | /* Some lockres types want to do a bit of work before | |
2986 | * downconverting a lock. Allow that here. The worker function | |
2987 | * may sleep, so we save off a copy of what we're blocking as | |
2988 | * it may change while we're not holding the spin lock. */ | |
2989 | blocking = lockres->l_blocking; | |
2990 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2991 | ||
cc567d89 | 2992 | ctl->unblock_action = lockres->l_ops->downconvert_worker(lockres, blocking); |
d680efe9 MF |
2993 | |
2994 | if (ctl->unblock_action == UNBLOCK_STOP_POST) | |
2995 | goto leave; | |
ccd979bd MF |
2996 | |
2997 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2998 | if (blocking != lockres->l_blocking) { | |
2999 | /* If this changed underneath us, then we can't drop | |
3000 | * it just yet. */ | |
3001 | goto recheck; | |
3002 | } | |
3003 | ||
3004 | downconvert: | |
d680efe9 | 3005 | ctl->requeue = 0; |
ccd979bd | 3006 | |
5ef0d4ea MF |
3007 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) { |
3008 | if (lockres->l_level == LKM_EXMODE) | |
3009 | set_lvb = 1; | |
3010 | ||
3011 | /* | |
3012 | * We only set the lvb if the lock has been fully | |
3013 | * refreshed - otherwise we risk setting stale | |
3014 | * data. Otherwise, there's no need to actually clear | |
3015 | * out the lvb here as it's value is still valid. | |
3016 | */ | |
3017 | if (set_lvb && !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) | |
3018 | lockres->l_ops->set_lvb(lockres); | |
3019 | } | |
3020 | ||
ccd979bd MF |
3021 | ocfs2_prepare_downconvert(lockres, new_level); |
3022 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
5ef0d4ea | 3023 | ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb); |
ccd979bd MF |
3024 | leave: |
3025 | mlog_exit(ret); | |
3026 | return ret; | |
f7fbfdd1 MF |
3027 | |
3028 | leave_requeue: | |
3029 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3030 | ctl->requeue = 1; | |
3031 | ||
3032 | mlog_exit(0); | |
3033 | return 0; | |
ccd979bd MF |
3034 | } |
3035 | ||
d680efe9 MF |
3036 | static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, |
3037 | int blocking) | |
ccd979bd MF |
3038 | { |
3039 | struct inode *inode; | |
3040 | struct address_space *mapping; | |
3041 | ||
ccd979bd MF |
3042 | inode = ocfs2_lock_res_inode(lockres); |
3043 | mapping = inode->i_mapping; | |
3044 | ||
1044e401 | 3045 | if (!S_ISREG(inode->i_mode)) |
f1f54068 MF |
3046 | goto out; |
3047 | ||
7f4a2a97 MF |
3048 | /* |
3049 | * We need this before the filemap_fdatawrite() so that it can | |
3050 | * transfer the dirty bit from the PTE to the | |
3051 | * page. Unfortunately this means that even for EX->PR | |
3052 | * downconverts, we'll lose our mappings and have to build | |
3053 | * them up again. | |
3054 | */ | |
3055 | unmap_mapping_range(mapping, 0, 0, 0); | |
3056 | ||
ccd979bd | 3057 | if (filemap_fdatawrite(mapping)) { |
b0697053 MF |
3058 | mlog(ML_ERROR, "Could not sync inode %llu for downconvert!", |
3059 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
ccd979bd MF |
3060 | } |
3061 | sync_mapping_buffers(mapping); | |
3062 | if (blocking == LKM_EXMODE) { | |
3063 | truncate_inode_pages(mapping, 0); | |
ccd979bd MF |
3064 | } else { |
3065 | /* We only need to wait on the I/O if we're not also | |
3066 | * truncating pages because truncate_inode_pages waits | |
3067 | * for us above. We don't truncate pages if we're | |
3068 | * blocking anything < EXMODE because we want to keep | |
3069 | * them around in that case. */ | |
3070 | filemap_fdatawait(mapping); | |
3071 | } | |
3072 | ||
f1f54068 | 3073 | out: |
d680efe9 | 3074 | return UNBLOCK_CONTINUE; |
ccd979bd MF |
3075 | } |
3076 | ||
810d5aeb MF |
3077 | static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres, |
3078 | int new_level) | |
3079 | { | |
3080 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
3081 | int checkpointed = ocfs2_inode_fully_checkpointed(inode); | |
3082 | ||
3083 | BUG_ON(new_level != LKM_NLMODE && new_level != LKM_PRMODE); | |
3084 | BUG_ON(lockres->l_level != LKM_EXMODE && !checkpointed); | |
3085 | ||
3086 | if (checkpointed) | |
3087 | return 1; | |
3088 | ||
3089 | ocfs2_start_checkpoint(OCFS2_SB(inode->i_sb)); | |
3090 | return 0; | |
3091 | } | |
3092 | ||
3093 | static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres) | |
3094 | { | |
3095 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
3096 | ||
3097 | __ocfs2_stuff_meta_lvb(inode); | |
3098 | } | |
3099 | ||
d680efe9 MF |
3100 | /* |
3101 | * Does the final reference drop on our dentry lock. Right now this | |
34d024f8 | 3102 | * happens in the downconvert thread, but we could choose to simplify the |
d680efe9 MF |
3103 | * dlmglue API and push these off to the ocfs2_wq in the future. |
3104 | */ | |
3105 | static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, | |
3106 | struct ocfs2_lock_res *lockres) | |
3107 | { | |
3108 | struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); | |
3109 | ocfs2_dentry_lock_put(osb, dl); | |
3110 | } | |
3111 | ||
3112 | /* | |
3113 | * d_delete() matching dentries before the lock downconvert. | |
3114 | * | |
3115 | * At this point, any process waiting to destroy the | |
3116 | * dentry_lock due to last ref count is stopped by the | |
3117 | * OCFS2_LOCK_QUEUED flag. | |
3118 | * | |
3119 | * We have two potential problems | |
3120 | * | |
3121 | * 1) If we do the last reference drop on our dentry_lock (via dput) | |
3122 | * we'll wind up in ocfs2_release_dentry_lock(), waiting on | |
3123 | * the downconvert to finish. Instead we take an elevated | |
3124 | * reference and push the drop until after we've completed our | |
3125 | * unblock processing. | |
3126 | * | |
3127 | * 2) There might be another process with a final reference, | |
3128 | * waiting on us to finish processing. If this is the case, we | |
3129 | * detect it and exit out - there's no more dentries anyway. | |
3130 | */ | |
3131 | static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, | |
3132 | int blocking) | |
3133 | { | |
3134 | struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); | |
3135 | struct ocfs2_inode_info *oi = OCFS2_I(dl->dl_inode); | |
3136 | struct dentry *dentry; | |
3137 | unsigned long flags; | |
3138 | int extra_ref = 0; | |
3139 | ||
3140 | /* | |
3141 | * This node is blocking another node from getting a read | |
3142 | * lock. This happens when we've renamed within a | |
3143 | * directory. We've forced the other nodes to d_delete(), but | |
3144 | * we never actually dropped our lock because it's still | |
3145 | * valid. The downconvert code will retain a PR for this node, | |
3146 | * so there's no further work to do. | |
3147 | */ | |
3148 | if (blocking == LKM_PRMODE) | |
3149 | return UNBLOCK_CONTINUE; | |
3150 | ||
3151 | /* | |
3152 | * Mark this inode as potentially orphaned. The code in | |
3153 | * ocfs2_delete_inode() will figure out whether it actually | |
3154 | * needs to be freed or not. | |
3155 | */ | |
3156 | spin_lock(&oi->ip_lock); | |
3157 | oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED; | |
3158 | spin_unlock(&oi->ip_lock); | |
3159 | ||
3160 | /* | |
3161 | * Yuck. We need to make sure however that the check of | |
3162 | * OCFS2_LOCK_FREEING and the extra reference are atomic with | |
3163 | * respect to a reference decrement or the setting of that | |
3164 | * flag. | |
3165 | */ | |
3166 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3167 | spin_lock(&dentry_attach_lock); | |
3168 | if (!(lockres->l_flags & OCFS2_LOCK_FREEING) | |
3169 | && dl->dl_count) { | |
3170 | dl->dl_count++; | |
3171 | extra_ref = 1; | |
3172 | } | |
3173 | spin_unlock(&dentry_attach_lock); | |
3174 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3175 | ||
3176 | mlog(0, "extra_ref = %d\n", extra_ref); | |
3177 | ||
3178 | /* | |
3179 | * We have a process waiting on us in ocfs2_dentry_iput(), | |
3180 | * which means we can't have any more outstanding | |
3181 | * aliases. There's no need to do any more work. | |
3182 | */ | |
3183 | if (!extra_ref) | |
3184 | return UNBLOCK_CONTINUE; | |
3185 | ||
3186 | spin_lock(&dentry_attach_lock); | |
3187 | while (1) { | |
3188 | dentry = ocfs2_find_local_alias(dl->dl_inode, | |
3189 | dl->dl_parent_blkno, 1); | |
3190 | if (!dentry) | |
3191 | break; | |
3192 | spin_unlock(&dentry_attach_lock); | |
3193 | ||
3194 | mlog(0, "d_delete(%.*s);\n", dentry->d_name.len, | |
3195 | dentry->d_name.name); | |
3196 | ||
3197 | /* | |
3198 | * The following dcache calls may do an | |
3199 | * iput(). Normally we don't want that from the | |
3200 | * downconverting thread, but in this case it's ok | |
3201 | * because the requesting node already has an | |
3202 | * exclusive lock on the inode, so it can't be queued | |
3203 | * for a downconvert. | |
3204 | */ | |
3205 | d_delete(dentry); | |
3206 | dput(dentry); | |
3207 | ||
3208 | spin_lock(&dentry_attach_lock); | |
3209 | } | |
3210 | spin_unlock(&dentry_attach_lock); | |
3211 | ||
3212 | /* | |
3213 | * If we are the last holder of this dentry lock, there is no | |
3214 | * reason to downconvert so skip straight to the unlock. | |
3215 | */ | |
3216 | if (dl->dl_count == 1) | |
3217 | return UNBLOCK_STOP_POST; | |
3218 | ||
3219 | return UNBLOCK_CONTINUE_POST; | |
3220 | } | |
3221 | ||
00600056 AB |
3222 | static void ocfs2_process_blocked_lock(struct ocfs2_super *osb, |
3223 | struct ocfs2_lock_res *lockres) | |
ccd979bd MF |
3224 | { |
3225 | int status; | |
d680efe9 | 3226 | struct ocfs2_unblock_ctl ctl = {0, 0,}; |
ccd979bd MF |
3227 | unsigned long flags; |
3228 | ||
3229 | /* Our reference to the lockres in this function can be | |
3230 | * considered valid until we remove the OCFS2_LOCK_QUEUED | |
3231 | * flag. */ | |
3232 | ||
3233 | mlog_entry_void(); | |
3234 | ||
3235 | BUG_ON(!lockres); | |
3236 | BUG_ON(!lockres->l_ops); | |
ccd979bd MF |
3237 | |
3238 | mlog(0, "lockres %s blocked.\n", lockres->l_name); | |
3239 | ||
3240 | /* Detect whether a lock has been marked as going away while | |
34d024f8 | 3241 | * the downconvert thread was processing other things. A lock can |
ccd979bd MF |
3242 | * still be marked with OCFS2_LOCK_FREEING after this check, |
3243 | * but short circuiting here will still save us some | |
3244 | * performance. */ | |
3245 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3246 | if (lockres->l_flags & OCFS2_LOCK_FREEING) | |
3247 | goto unqueue; | |
3248 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3249 | ||
b5e500e2 | 3250 | status = ocfs2_unblock_lock(osb, lockres, &ctl); |
ccd979bd MF |
3251 | if (status < 0) |
3252 | mlog_errno(status); | |
3253 | ||
3254 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3255 | unqueue: | |
d680efe9 | 3256 | if (lockres->l_flags & OCFS2_LOCK_FREEING || !ctl.requeue) { |
ccd979bd MF |
3257 | lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED); |
3258 | } else | |
3259 | ocfs2_schedule_blocked_lock(osb, lockres); | |
3260 | ||
3261 | mlog(0, "lockres %s, requeue = %s.\n", lockres->l_name, | |
d680efe9 | 3262 | ctl.requeue ? "yes" : "no"); |
ccd979bd MF |
3263 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
3264 | ||
d680efe9 MF |
3265 | if (ctl.unblock_action != UNBLOCK_CONTINUE |
3266 | && lockres->l_ops->post_unlock) | |
3267 | lockres->l_ops->post_unlock(osb, lockres); | |
3268 | ||
ccd979bd MF |
3269 | mlog_exit_void(); |
3270 | } | |
3271 | ||
3272 | static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, | |
3273 | struct ocfs2_lock_res *lockres) | |
3274 | { | |
3275 | mlog_entry_void(); | |
3276 | ||
3277 | assert_spin_locked(&lockres->l_lock); | |
3278 | ||
3279 | if (lockres->l_flags & OCFS2_LOCK_FREEING) { | |
3280 | /* Do not schedule a lock for downconvert when it's on | |
3281 | * the way to destruction - any nodes wanting access | |
3282 | * to the resource will get it soon. */ | |
3283 | mlog(0, "Lockres %s won't be scheduled: flags 0x%lx\n", | |
3284 | lockres->l_name, lockres->l_flags); | |
3285 | return; | |
3286 | } | |
3287 | ||
3288 | lockres_or_flags(lockres, OCFS2_LOCK_QUEUED); | |
3289 | ||
34d024f8 | 3290 | spin_lock(&osb->dc_task_lock); |
ccd979bd MF |
3291 | if (list_empty(&lockres->l_blocked_list)) { |
3292 | list_add_tail(&lockres->l_blocked_list, | |
3293 | &osb->blocked_lock_list); | |
3294 | osb->blocked_lock_count++; | |
3295 | } | |
34d024f8 | 3296 | spin_unlock(&osb->dc_task_lock); |
ccd979bd MF |
3297 | |
3298 | mlog_exit_void(); | |
3299 | } | |
34d024f8 MF |
3300 | |
3301 | static void ocfs2_downconvert_thread_do_work(struct ocfs2_super *osb) | |
3302 | { | |
3303 | unsigned long processed; | |
3304 | struct ocfs2_lock_res *lockres; | |
3305 | ||
3306 | mlog_entry_void(); | |
3307 | ||
3308 | spin_lock(&osb->dc_task_lock); | |
3309 | /* grab this early so we know to try again if a state change and | |
3310 | * wake happens part-way through our work */ | |
3311 | osb->dc_work_sequence = osb->dc_wake_sequence; | |
3312 | ||
3313 | processed = osb->blocked_lock_count; | |
3314 | while (processed) { | |
3315 | BUG_ON(list_empty(&osb->blocked_lock_list)); | |
3316 | ||
3317 | lockres = list_entry(osb->blocked_lock_list.next, | |
3318 | struct ocfs2_lock_res, l_blocked_list); | |
3319 | list_del_init(&lockres->l_blocked_list); | |
3320 | osb->blocked_lock_count--; | |
3321 | spin_unlock(&osb->dc_task_lock); | |
3322 | ||
3323 | BUG_ON(!processed); | |
3324 | processed--; | |
3325 | ||
3326 | ocfs2_process_blocked_lock(osb, lockres); | |
3327 | ||
3328 | spin_lock(&osb->dc_task_lock); | |
3329 | } | |
3330 | spin_unlock(&osb->dc_task_lock); | |
3331 | ||
3332 | mlog_exit_void(); | |
3333 | } | |
3334 | ||
3335 | static int ocfs2_downconvert_thread_lists_empty(struct ocfs2_super *osb) | |
3336 | { | |
3337 | int empty = 0; | |
3338 | ||
3339 | spin_lock(&osb->dc_task_lock); | |
3340 | if (list_empty(&osb->blocked_lock_list)) | |
3341 | empty = 1; | |
3342 | ||
3343 | spin_unlock(&osb->dc_task_lock); | |
3344 | return empty; | |
3345 | } | |
3346 | ||
3347 | static int ocfs2_downconvert_thread_should_wake(struct ocfs2_super *osb) | |
3348 | { | |
3349 | int should_wake = 0; | |
3350 | ||
3351 | spin_lock(&osb->dc_task_lock); | |
3352 | if (osb->dc_work_sequence != osb->dc_wake_sequence) | |
3353 | should_wake = 1; | |
3354 | spin_unlock(&osb->dc_task_lock); | |
3355 | ||
3356 | return should_wake; | |
3357 | } | |
3358 | ||
200bfae3 | 3359 | static int ocfs2_downconvert_thread(void *arg) |
34d024f8 MF |
3360 | { |
3361 | int status = 0; | |
3362 | struct ocfs2_super *osb = arg; | |
3363 | ||
3364 | /* only quit once we've been asked to stop and there is no more | |
3365 | * work available */ | |
3366 | while (!(kthread_should_stop() && | |
3367 | ocfs2_downconvert_thread_lists_empty(osb))) { | |
3368 | ||
3369 | wait_event_interruptible(osb->dc_event, | |
3370 | ocfs2_downconvert_thread_should_wake(osb) || | |
3371 | kthread_should_stop()); | |
3372 | ||
3373 | mlog(0, "downconvert_thread: awoken\n"); | |
3374 | ||
3375 | ocfs2_downconvert_thread_do_work(osb); | |
3376 | } | |
3377 | ||
3378 | osb->dc_task = NULL; | |
3379 | return status; | |
3380 | } | |
3381 | ||
3382 | void ocfs2_wake_downconvert_thread(struct ocfs2_super *osb) | |
3383 | { | |
3384 | spin_lock(&osb->dc_task_lock); | |
3385 | /* make sure the voting thread gets a swipe at whatever changes | |
3386 | * the caller may have made to the voting state */ | |
3387 | osb->dc_wake_sequence++; | |
3388 | spin_unlock(&osb->dc_task_lock); | |
3389 | wake_up(&osb->dc_event); | |
3390 | } |