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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/kthread.h> |
31 | #include <linux/pagemap.h> | |
32 | #include <linux/debugfs.h> | |
33 | #include <linux/seq_file.h> | |
8ddb7b00 | 34 | #include <linux/time.h> |
9e33d69f | 35 | #include <linux/quotaops.h> |
ccd979bd | 36 | |
ccd979bd MF |
37 | #define MLOG_MASK_PREFIX ML_DLM_GLUE |
38 | #include <cluster/masklog.h> | |
39 | ||
40 | #include "ocfs2.h" | |
d24fbcda | 41 | #include "ocfs2_lockingver.h" |
ccd979bd MF |
42 | |
43 | #include "alloc.h" | |
d680efe9 | 44 | #include "dcache.h" |
ccd979bd MF |
45 | #include "dlmglue.h" |
46 | #include "extent_map.h" | |
7f1a37e3 | 47 | #include "file.h" |
ccd979bd MF |
48 | #include "heartbeat.h" |
49 | #include "inode.h" | |
50 | #include "journal.h" | |
24ef1815 | 51 | #include "stackglue.h" |
ccd979bd MF |
52 | #include "slot_map.h" |
53 | #include "super.h" | |
54 | #include "uptodate.h" | |
9e33d69f | 55 | #include "quota.h" |
ccd979bd MF |
56 | |
57 | #include "buffer_head_io.h" | |
58 | ||
59 | struct ocfs2_mask_waiter { | |
60 | struct list_head mw_item; | |
61 | int mw_status; | |
62 | struct completion mw_complete; | |
63 | unsigned long mw_mask; | |
64 | unsigned long mw_goal; | |
8ddb7b00 SM |
65 | #ifdef CONFIG_OCFS2_FS_STATS |
66 | unsigned long long mw_lock_start; | |
67 | #endif | |
ccd979bd MF |
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); |
9e33d69f | 73 | static struct ocfs2_super *ocfs2_get_qinfo_osb(struct ocfs2_lock_res *lockres); |
ccd979bd | 74 | |
d680efe9 | 75 | /* |
cc567d89 | 76 | * Return value from ->downconvert_worker functions. |
d680efe9 | 77 | * |
b5e500e2 | 78 | * These control the precise actions of ocfs2_unblock_lock() |
d680efe9 MF |
79 | * and ocfs2_process_blocked_lock() |
80 | * | |
81 | */ | |
82 | enum ocfs2_unblock_action { | |
83 | UNBLOCK_CONTINUE = 0, /* Continue downconvert */ | |
84 | UNBLOCK_CONTINUE_POST = 1, /* Continue downconvert, fire | |
85 | * ->post_unlock callback */ | |
86 | UNBLOCK_STOP_POST = 2, /* Do not downconvert, fire | |
87 | * ->post_unlock() callback. */ | |
88 | }; | |
89 | ||
90 | struct ocfs2_unblock_ctl { | |
91 | int requeue; | |
92 | enum ocfs2_unblock_action unblock_action; | |
93 | }; | |
94 | ||
810d5aeb MF |
95 | static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres, |
96 | int new_level); | |
97 | static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres); | |
98 | ||
cc567d89 MF |
99 | static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, |
100 | int blocking); | |
101 | ||
cc567d89 MF |
102 | static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, |
103 | int blocking); | |
d680efe9 MF |
104 | |
105 | static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, | |
106 | struct ocfs2_lock_res *lockres); | |
ccd979bd | 107 | |
9e33d69f | 108 | static void ocfs2_set_qinfo_lvb(struct ocfs2_lock_res *lockres); |
6cb129f5 AB |
109 | |
110 | #define mlog_meta_lvb(__level, __lockres) ocfs2_dump_meta_lvb_info(__level, __PRETTY_FUNCTION__, __LINE__, __lockres) | |
111 | ||
112 | /* This aids in debugging situations where a bad LVB might be involved. */ | |
113 | static void ocfs2_dump_meta_lvb_info(u64 level, | |
114 | const char *function, | |
115 | unsigned int line, | |
116 | struct ocfs2_lock_res *lockres) | |
117 | { | |
a641dc2a | 118 | struct ocfs2_meta_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
6cb129f5 AB |
119 | |
120 | mlog(level, "LVB information for %s (called from %s:%u):\n", | |
121 | lockres->l_name, function, line); | |
122 | mlog(level, "version: %u, clusters: %u, generation: 0x%x\n", | |
123 | lvb->lvb_version, be32_to_cpu(lvb->lvb_iclusters), | |
124 | be32_to_cpu(lvb->lvb_igeneration)); | |
125 | mlog(level, "size: %llu, uid %u, gid %u, mode 0x%x\n", | |
126 | (unsigned long long)be64_to_cpu(lvb->lvb_isize), | |
127 | be32_to_cpu(lvb->lvb_iuid), be32_to_cpu(lvb->lvb_igid), | |
128 | be16_to_cpu(lvb->lvb_imode)); | |
129 | mlog(level, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, " | |
130 | "mtime_packed 0x%llx iattr 0x%x\n", be16_to_cpu(lvb->lvb_inlink), | |
131 | (long long)be64_to_cpu(lvb->lvb_iatime_packed), | |
132 | (long long)be64_to_cpu(lvb->lvb_ictime_packed), | |
133 | (long long)be64_to_cpu(lvb->lvb_imtime_packed), | |
134 | be32_to_cpu(lvb->lvb_iattr)); | |
135 | } | |
136 | ||
137 | ||
f625c979 MF |
138 | /* |
139 | * OCFS2 Lock Resource Operations | |
140 | * | |
141 | * These fine tune the behavior of the generic dlmglue locking infrastructure. | |
0d5dc6c2 MF |
142 | * |
143 | * The most basic of lock types can point ->l_priv to their respective | |
144 | * struct ocfs2_super and allow the default actions to manage things. | |
145 | * | |
146 | * Right now, each lock type also needs to implement an init function, | |
147 | * and trivial lock/unlock wrappers. ocfs2_simple_drop_lockres() | |
148 | * should be called when the lock is no longer needed (i.e., object | |
149 | * destruction time). | |
f625c979 | 150 | */ |
ccd979bd | 151 | struct ocfs2_lock_res_ops { |
54a7e755 MF |
152 | /* |
153 | * Translate an ocfs2_lock_res * into an ocfs2_super *. Define | |
154 | * this callback if ->l_priv is not an ocfs2_super pointer | |
155 | */ | |
156 | struct ocfs2_super * (*get_osb)(struct ocfs2_lock_res *); | |
b5e500e2 | 157 | |
0d5dc6c2 | 158 | /* |
34d024f8 MF |
159 | * Optionally called in the downconvert thread after a |
160 | * successful downconvert. The lockres will not be referenced | |
161 | * after this callback is called, so it is safe to free | |
162 | * memory, etc. | |
0d5dc6c2 MF |
163 | * |
164 | * The exact semantics of when this is called are controlled | |
165 | * by ->downconvert_worker() | |
166 | */ | |
d680efe9 | 167 | void (*post_unlock)(struct ocfs2_super *, struct ocfs2_lock_res *); |
f625c979 | 168 | |
16d5b956 MF |
169 | /* |
170 | * Allow a lock type to add checks to determine whether it is | |
171 | * safe to downconvert a lock. Return 0 to re-queue the | |
172 | * downconvert at a later time, nonzero to continue. | |
173 | * | |
174 | * For most locks, the default checks that there are no | |
175 | * incompatible holders are sufficient. | |
176 | * | |
177 | * Called with the lockres spinlock held. | |
178 | */ | |
179 | int (*check_downconvert)(struct ocfs2_lock_res *, int); | |
180 | ||
5ef0d4ea MF |
181 | /* |
182 | * Allows a lock type to populate the lock value block. This | |
183 | * is called on downconvert, and when we drop a lock. | |
184 | * | |
185 | * Locks that want to use this should set LOCK_TYPE_USES_LVB | |
186 | * in the flags field. | |
187 | * | |
188 | * Called with the lockres spinlock held. | |
189 | */ | |
190 | void (*set_lvb)(struct ocfs2_lock_res *); | |
191 | ||
cc567d89 MF |
192 | /* |
193 | * Called from the downconvert thread when it is determined | |
194 | * that a lock will be downconverted. This is called without | |
195 | * any locks held so the function can do work that might | |
196 | * schedule (syncing out data, etc). | |
197 | * | |
198 | * This should return any one of the ocfs2_unblock_action | |
199 | * values, depending on what it wants the thread to do. | |
200 | */ | |
201 | int (*downconvert_worker)(struct ocfs2_lock_res *, int); | |
202 | ||
f625c979 MF |
203 | /* |
204 | * LOCK_TYPE_* flags which describe the specific requirements | |
205 | * of a lock type. Descriptions of each individual flag follow. | |
206 | */ | |
207 | int flags; | |
ccd979bd MF |
208 | }; |
209 | ||
f625c979 MF |
210 | /* |
211 | * Some locks want to "refresh" potentially stale data when a | |
212 | * meaningful (PRMODE or EXMODE) lock level is first obtained. If this | |
213 | * flag is set, the OCFS2_LOCK_NEEDS_REFRESH flag will be set on the | |
214 | * individual lockres l_flags member from the ast function. It is | |
215 | * expected that the locking wrapper will clear the | |
216 | * OCFS2_LOCK_NEEDS_REFRESH flag when done. | |
217 | */ | |
218 | #define LOCK_TYPE_REQUIRES_REFRESH 0x1 | |
219 | ||
b80fc012 | 220 | /* |
5ef0d4ea MF |
221 | * Indicate that a lock type makes use of the lock value block. The |
222 | * ->set_lvb lock type callback must be defined. | |
b80fc012 MF |
223 | */ |
224 | #define LOCK_TYPE_USES_LVB 0x2 | |
225 | ||
ccd979bd | 226 | static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = { |
54a7e755 | 227 | .get_osb = ocfs2_get_inode_osb, |
f625c979 | 228 | .flags = 0, |
ccd979bd MF |
229 | }; |
230 | ||
e63aecb6 | 231 | static struct ocfs2_lock_res_ops ocfs2_inode_inode_lops = { |
54a7e755 | 232 | .get_osb = ocfs2_get_inode_osb, |
810d5aeb MF |
233 | .check_downconvert = ocfs2_check_meta_downconvert, |
234 | .set_lvb = ocfs2_set_meta_lvb, | |
f1f54068 | 235 | .downconvert_worker = ocfs2_data_convert_worker, |
b80fc012 | 236 | .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB, |
ccd979bd MF |
237 | }; |
238 | ||
ccd979bd | 239 | static struct ocfs2_lock_res_ops ocfs2_super_lops = { |
f625c979 | 240 | .flags = LOCK_TYPE_REQUIRES_REFRESH, |
ccd979bd MF |
241 | }; |
242 | ||
243 | static struct ocfs2_lock_res_ops ocfs2_rename_lops = { | |
f625c979 | 244 | .flags = 0, |
ccd979bd MF |
245 | }; |
246 | ||
6ca497a8 | 247 | static struct ocfs2_lock_res_ops ocfs2_nfs_sync_lops = { |
248 | .flags = 0, | |
249 | }; | |
250 | ||
83273932 SE |
251 | static struct ocfs2_lock_res_ops ocfs2_orphan_scan_lops = { |
252 | .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB, | |
253 | }; | |
254 | ||
d680efe9 | 255 | static struct ocfs2_lock_res_ops ocfs2_dentry_lops = { |
54a7e755 | 256 | .get_osb = ocfs2_get_dentry_osb, |
d680efe9 | 257 | .post_unlock = ocfs2_dentry_post_unlock, |
cc567d89 | 258 | .downconvert_worker = ocfs2_dentry_convert_worker, |
f625c979 | 259 | .flags = 0, |
d680efe9 MF |
260 | }; |
261 | ||
50008630 TY |
262 | static struct ocfs2_lock_res_ops ocfs2_inode_open_lops = { |
263 | .get_osb = ocfs2_get_inode_osb, | |
264 | .flags = 0, | |
265 | }; | |
266 | ||
cf8e06f1 MF |
267 | static struct ocfs2_lock_res_ops ocfs2_flock_lops = { |
268 | .get_osb = ocfs2_get_file_osb, | |
269 | .flags = 0, | |
270 | }; | |
271 | ||
9e33d69f JK |
272 | static struct ocfs2_lock_res_ops ocfs2_qinfo_lops = { |
273 | .set_lvb = ocfs2_set_qinfo_lvb, | |
274 | .get_osb = ocfs2_get_qinfo_osb, | |
275 | .flags = LOCK_TYPE_REQUIRES_REFRESH | LOCK_TYPE_USES_LVB, | |
276 | }; | |
277 | ||
ccd979bd MF |
278 | static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres) |
279 | { | |
280 | return lockres->l_type == OCFS2_LOCK_TYPE_META || | |
50008630 TY |
281 | lockres->l_type == OCFS2_LOCK_TYPE_RW || |
282 | lockres->l_type == OCFS2_LOCK_TYPE_OPEN; | |
ccd979bd MF |
283 | } |
284 | ||
ccd979bd MF |
285 | static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres) |
286 | { | |
287 | BUG_ON(!ocfs2_is_inode_lock(lockres)); | |
288 | ||
289 | return (struct inode *) lockres->l_priv; | |
290 | } | |
291 | ||
d680efe9 MF |
292 | static inline struct ocfs2_dentry_lock *ocfs2_lock_res_dl(struct ocfs2_lock_res *lockres) |
293 | { | |
294 | BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_DENTRY); | |
295 | ||
296 | return (struct ocfs2_dentry_lock *)lockres->l_priv; | |
297 | } | |
298 | ||
9e33d69f JK |
299 | static inline struct ocfs2_mem_dqinfo *ocfs2_lock_res_qinfo(struct ocfs2_lock_res *lockres) |
300 | { | |
301 | BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_QINFO); | |
302 | ||
303 | return (struct ocfs2_mem_dqinfo *)lockres->l_priv; | |
304 | } | |
305 | ||
54a7e755 MF |
306 | static inline struct ocfs2_super *ocfs2_get_lockres_osb(struct ocfs2_lock_res *lockres) |
307 | { | |
308 | if (lockres->l_ops->get_osb) | |
309 | return lockres->l_ops->get_osb(lockres); | |
310 | ||
311 | return (struct ocfs2_super *)lockres->l_priv; | |
312 | } | |
313 | ||
ccd979bd MF |
314 | static int ocfs2_lock_create(struct ocfs2_super *osb, |
315 | struct ocfs2_lock_res *lockres, | |
316 | int level, | |
bd3e7610 | 317 | u32 dlm_flags); |
ccd979bd MF |
318 | static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, |
319 | int wanted); | |
320 | static void ocfs2_cluster_unlock(struct ocfs2_super *osb, | |
321 | struct ocfs2_lock_res *lockres, | |
322 | int level); | |
323 | static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres); | |
324 | static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres); | |
325 | static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres); | |
326 | static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, int level); | |
327 | static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, | |
328 | struct ocfs2_lock_res *lockres); | |
329 | static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, | |
330 | int convert); | |
c74ff8bb SM |
331 | #define ocfs2_log_dlm_error(_func, _err, _lockres) do { \ |
332 | if ((_lockres)->l_type != OCFS2_LOCK_TYPE_DENTRY) \ | |
333 | mlog(ML_ERROR, "DLM error %d while calling %s on resource %s\n", \ | |
334 | _err, _func, _lockres->l_name); \ | |
335 | else \ | |
336 | mlog(ML_ERROR, "DLM error %d while calling %s on resource %.*s%08x\n", \ | |
337 | _err, _func, OCFS2_DENTRY_LOCK_INO_START - 1, (_lockres)->l_name, \ | |
338 | (unsigned int)ocfs2_get_dentry_lock_ino(_lockres)); \ | |
ccd979bd | 339 | } while (0) |
34d024f8 MF |
340 | static int ocfs2_downconvert_thread(void *arg); |
341 | static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb, | |
342 | struct ocfs2_lock_res *lockres); | |
e63aecb6 | 343 | static int ocfs2_inode_lock_update(struct inode *inode, |
ccd979bd MF |
344 | struct buffer_head **bh); |
345 | static void ocfs2_drop_osb_locks(struct ocfs2_super *osb); | |
346 | static inline int ocfs2_highest_compat_lock_level(int level); | |
de551246 JB |
347 | static unsigned int ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres, |
348 | int new_level); | |
cf8e06f1 MF |
349 | static int ocfs2_downconvert_lock(struct ocfs2_super *osb, |
350 | struct ocfs2_lock_res *lockres, | |
351 | int new_level, | |
de551246 JB |
352 | int lvb, |
353 | unsigned int generation); | |
cf8e06f1 MF |
354 | static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb, |
355 | struct ocfs2_lock_res *lockres); | |
356 | static int ocfs2_cancel_convert(struct ocfs2_super *osb, | |
357 | struct ocfs2_lock_res *lockres); | |
358 | ||
ccd979bd | 359 | |
ccd979bd MF |
360 | static void ocfs2_build_lock_name(enum ocfs2_lock_type type, |
361 | u64 blkno, | |
362 | u32 generation, | |
363 | char *name) | |
364 | { | |
365 | int len; | |
366 | ||
367 | mlog_entry_void(); | |
368 | ||
369 | BUG_ON(type >= OCFS2_NUM_LOCK_TYPES); | |
370 | ||
b0697053 MF |
371 | len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016llx%08x", |
372 | ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD, | |
373 | (long long)blkno, generation); | |
ccd979bd MF |
374 | |
375 | BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1)); | |
376 | ||
377 | mlog(0, "built lock resource with name: %s\n", name); | |
378 | ||
379 | mlog_exit_void(); | |
380 | } | |
381 | ||
34af946a | 382 | static DEFINE_SPINLOCK(ocfs2_dlm_tracking_lock); |
ccd979bd MF |
383 | |
384 | static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res, | |
385 | struct ocfs2_dlm_debug *dlm_debug) | |
386 | { | |
387 | mlog(0, "Add tracking for lockres %s\n", res->l_name); | |
388 | ||
389 | spin_lock(&ocfs2_dlm_tracking_lock); | |
390 | list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking); | |
391 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
392 | } | |
393 | ||
394 | static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res) | |
395 | { | |
396 | spin_lock(&ocfs2_dlm_tracking_lock); | |
397 | if (!list_empty(&res->l_debug_list)) | |
398 | list_del_init(&res->l_debug_list); | |
399 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
400 | } | |
401 | ||
8ddb7b00 SM |
402 | #ifdef CONFIG_OCFS2_FS_STATS |
403 | static void ocfs2_init_lock_stats(struct ocfs2_lock_res *res) | |
404 | { | |
405 | res->l_lock_num_prmode = 0; | |
406 | res->l_lock_num_prmode_failed = 0; | |
407 | res->l_lock_total_prmode = 0; | |
408 | res->l_lock_max_prmode = 0; | |
409 | res->l_lock_num_exmode = 0; | |
410 | res->l_lock_num_exmode_failed = 0; | |
411 | res->l_lock_total_exmode = 0; | |
412 | res->l_lock_max_exmode = 0; | |
413 | res->l_lock_refresh = 0; | |
414 | } | |
415 | ||
416 | static void ocfs2_update_lock_stats(struct ocfs2_lock_res *res, int level, | |
417 | struct ocfs2_mask_waiter *mw, int ret) | |
418 | { | |
419 | unsigned long long *num, *sum; | |
420 | unsigned int *max, *failed; | |
421 | struct timespec ts = current_kernel_time(); | |
422 | unsigned long long time = timespec_to_ns(&ts) - mw->mw_lock_start; | |
423 | ||
424 | if (level == LKM_PRMODE) { | |
425 | num = &res->l_lock_num_prmode; | |
426 | sum = &res->l_lock_total_prmode; | |
427 | max = &res->l_lock_max_prmode; | |
428 | failed = &res->l_lock_num_prmode_failed; | |
429 | } else if (level == LKM_EXMODE) { | |
430 | num = &res->l_lock_num_exmode; | |
431 | sum = &res->l_lock_total_exmode; | |
432 | max = &res->l_lock_max_exmode; | |
433 | failed = &res->l_lock_num_exmode_failed; | |
434 | } else | |
435 | return; | |
436 | ||
437 | (*num)++; | |
438 | (*sum) += time; | |
439 | if (time > *max) | |
440 | *max = time; | |
441 | if (ret) | |
442 | (*failed)++; | |
443 | } | |
444 | ||
445 | static inline void ocfs2_track_lock_refresh(struct ocfs2_lock_res *lockres) | |
446 | { | |
447 | lockres->l_lock_refresh++; | |
448 | } | |
449 | ||
450 | static inline void ocfs2_init_start_time(struct ocfs2_mask_waiter *mw) | |
451 | { | |
452 | struct timespec ts = current_kernel_time(); | |
453 | mw->mw_lock_start = timespec_to_ns(&ts); | |
454 | } | |
455 | #else | |
456 | static inline void ocfs2_init_lock_stats(struct ocfs2_lock_res *res) | |
457 | { | |
458 | } | |
459 | static inline void ocfs2_update_lock_stats(struct ocfs2_lock_res *res, | |
460 | int level, struct ocfs2_mask_waiter *mw, int ret) | |
461 | { | |
462 | } | |
463 | static inline void ocfs2_track_lock_refresh(struct ocfs2_lock_res *lockres) | |
464 | { | |
465 | } | |
466 | static inline void ocfs2_init_start_time(struct ocfs2_mask_waiter *mw) | |
467 | { | |
468 | } | |
469 | #endif | |
470 | ||
ccd979bd MF |
471 | static void ocfs2_lock_res_init_common(struct ocfs2_super *osb, |
472 | struct ocfs2_lock_res *res, | |
473 | enum ocfs2_lock_type type, | |
ccd979bd MF |
474 | struct ocfs2_lock_res_ops *ops, |
475 | void *priv) | |
476 | { | |
ccd979bd MF |
477 | res->l_type = type; |
478 | res->l_ops = ops; | |
479 | res->l_priv = priv; | |
480 | ||
bd3e7610 JB |
481 | res->l_level = DLM_LOCK_IV; |
482 | res->l_requested = DLM_LOCK_IV; | |
483 | res->l_blocking = DLM_LOCK_IV; | |
ccd979bd MF |
484 | res->l_action = OCFS2_AST_INVALID; |
485 | res->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
486 | ||
487 | res->l_flags = OCFS2_LOCK_INITIALIZED; | |
488 | ||
489 | ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug); | |
8ddb7b00 SM |
490 | |
491 | ocfs2_init_lock_stats(res); | |
ccd979bd MF |
492 | } |
493 | ||
494 | void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res) | |
495 | { | |
496 | /* This also clears out the lock status block */ | |
497 | memset(res, 0, sizeof(struct ocfs2_lock_res)); | |
498 | spin_lock_init(&res->l_lock); | |
499 | init_waitqueue_head(&res->l_event); | |
500 | INIT_LIST_HEAD(&res->l_blocked_list); | |
501 | INIT_LIST_HEAD(&res->l_mask_waiters); | |
502 | } | |
503 | ||
504 | void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res, | |
505 | enum ocfs2_lock_type type, | |
24c19ef4 | 506 | unsigned int generation, |
ccd979bd MF |
507 | struct inode *inode) |
508 | { | |
509 | struct ocfs2_lock_res_ops *ops; | |
510 | ||
511 | switch(type) { | |
512 | case OCFS2_LOCK_TYPE_RW: | |
513 | ops = &ocfs2_inode_rw_lops; | |
514 | break; | |
515 | case OCFS2_LOCK_TYPE_META: | |
e63aecb6 | 516 | ops = &ocfs2_inode_inode_lops; |
ccd979bd | 517 | break; |
50008630 TY |
518 | case OCFS2_LOCK_TYPE_OPEN: |
519 | ops = &ocfs2_inode_open_lops; | |
520 | break; | |
ccd979bd MF |
521 | default: |
522 | mlog_bug_on_msg(1, "type: %d\n", type); | |
523 | ops = NULL; /* thanks, gcc */ | |
524 | break; | |
525 | }; | |
526 | ||
d680efe9 | 527 | ocfs2_build_lock_name(type, OCFS2_I(inode)->ip_blkno, |
24c19ef4 | 528 | generation, res->l_name); |
d680efe9 MF |
529 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type, ops, inode); |
530 | } | |
531 | ||
54a7e755 MF |
532 | static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres) |
533 | { | |
534 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
535 | ||
536 | return OCFS2_SB(inode->i_sb); | |
537 | } | |
538 | ||
9e33d69f JK |
539 | static struct ocfs2_super *ocfs2_get_qinfo_osb(struct ocfs2_lock_res *lockres) |
540 | { | |
541 | struct ocfs2_mem_dqinfo *info = lockres->l_priv; | |
542 | ||
543 | return OCFS2_SB(info->dqi_gi.dqi_sb); | |
544 | } | |
545 | ||
cf8e06f1 MF |
546 | static struct ocfs2_super *ocfs2_get_file_osb(struct ocfs2_lock_res *lockres) |
547 | { | |
548 | struct ocfs2_file_private *fp = lockres->l_priv; | |
549 | ||
550 | return OCFS2_SB(fp->fp_file->f_mapping->host->i_sb); | |
551 | } | |
552 | ||
d680efe9 MF |
553 | static __u64 ocfs2_get_dentry_lock_ino(struct ocfs2_lock_res *lockres) |
554 | { | |
555 | __be64 inode_blkno_be; | |
556 | ||
557 | memcpy(&inode_blkno_be, &lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], | |
558 | sizeof(__be64)); | |
559 | ||
560 | return be64_to_cpu(inode_blkno_be); | |
561 | } | |
562 | ||
54a7e755 MF |
563 | static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres) |
564 | { | |
565 | struct ocfs2_dentry_lock *dl = lockres->l_priv; | |
566 | ||
567 | return OCFS2_SB(dl->dl_inode->i_sb); | |
568 | } | |
569 | ||
d680efe9 MF |
570 | void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl, |
571 | u64 parent, struct inode *inode) | |
572 | { | |
573 | int len; | |
574 | u64 inode_blkno = OCFS2_I(inode)->ip_blkno; | |
575 | __be64 inode_blkno_be = cpu_to_be64(inode_blkno); | |
576 | struct ocfs2_lock_res *lockres = &dl->dl_lockres; | |
577 | ||
578 | ocfs2_lock_res_init_once(lockres); | |
579 | ||
580 | /* | |
581 | * Unfortunately, the standard lock naming scheme won't work | |
582 | * here because we have two 16 byte values to use. Instead, | |
583 | * we'll stuff the inode number as a binary value. We still | |
584 | * want error prints to show something without garbling the | |
585 | * display, so drop a null byte in there before the inode | |
586 | * number. A future version of OCFS2 will likely use all | |
587 | * binary lock names. The stringified names have been a | |
588 | * tremendous aid in debugging, but now that the debugfs | |
589 | * interface exists, we can mangle things there if need be. | |
590 | * | |
591 | * NOTE: We also drop the standard "pad" value (the total lock | |
592 | * name size stays the same though - the last part is all | |
593 | * zeros due to the memset in ocfs2_lock_res_init_once() | |
594 | */ | |
595 | len = snprintf(lockres->l_name, OCFS2_DENTRY_LOCK_INO_START, | |
596 | "%c%016llx", | |
597 | ocfs2_lock_type_char(OCFS2_LOCK_TYPE_DENTRY), | |
598 | (long long)parent); | |
599 | ||
600 | BUG_ON(len != (OCFS2_DENTRY_LOCK_INO_START - 1)); | |
601 | ||
602 | memcpy(&lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], &inode_blkno_be, | |
603 | sizeof(__be64)); | |
604 | ||
605 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres, | |
606 | OCFS2_LOCK_TYPE_DENTRY, &ocfs2_dentry_lops, | |
607 | dl); | |
ccd979bd MF |
608 | } |
609 | ||
610 | static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res, | |
611 | struct ocfs2_super *osb) | |
612 | { | |
613 | /* Superblock lockres doesn't come from a slab so we call init | |
614 | * once on it manually. */ | |
615 | ocfs2_lock_res_init_once(res); | |
d680efe9 MF |
616 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_SUPER, OCFS2_SUPER_BLOCK_BLKNO, |
617 | 0, res->l_name); | |
ccd979bd | 618 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER, |
ccd979bd MF |
619 | &ocfs2_super_lops, osb); |
620 | } | |
621 | ||
622 | static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res, | |
623 | struct ocfs2_super *osb) | |
624 | { | |
625 | /* Rename lockres doesn't come from a slab so we call init | |
626 | * once on it manually. */ | |
627 | ocfs2_lock_res_init_once(res); | |
d680efe9 MF |
628 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_RENAME, 0, 0, res->l_name); |
629 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME, | |
ccd979bd MF |
630 | &ocfs2_rename_lops, osb); |
631 | } | |
632 | ||
6ca497a8 | 633 | static void ocfs2_nfs_sync_lock_res_init(struct ocfs2_lock_res *res, |
634 | struct ocfs2_super *osb) | |
635 | { | |
636 | /* nfs_sync lockres doesn't come from a slab so we call init | |
637 | * once on it manually. */ | |
638 | ocfs2_lock_res_init_once(res); | |
639 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_NFS_SYNC, 0, 0, res->l_name); | |
640 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_NFS_SYNC, | |
641 | &ocfs2_nfs_sync_lops, osb); | |
642 | } | |
643 | ||
83273932 SE |
644 | static void ocfs2_orphan_scan_lock_res_init(struct ocfs2_lock_res *res, |
645 | struct ocfs2_super *osb) | |
646 | { | |
647 | struct ocfs2_orphan_scan_lvb *lvb; | |
648 | ||
649 | ocfs2_lock_res_init_once(res); | |
650 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_ORPHAN_SCAN, 0, 0, res->l_name); | |
651 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_ORPHAN_SCAN, | |
652 | &ocfs2_orphan_scan_lops, osb); | |
653 | lvb = ocfs2_dlm_lvb(&res->l_lksb); | |
654 | lvb->lvb_version = OCFS2_ORPHAN_LVB_VERSION; | |
655 | } | |
656 | ||
cf8e06f1 MF |
657 | void ocfs2_file_lock_res_init(struct ocfs2_lock_res *lockres, |
658 | struct ocfs2_file_private *fp) | |
659 | { | |
660 | struct inode *inode = fp->fp_file->f_mapping->host; | |
661 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
662 | ||
663 | ocfs2_lock_res_init_once(lockres); | |
664 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_FLOCK, oi->ip_blkno, | |
665 | inode->i_generation, lockres->l_name); | |
666 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres, | |
667 | OCFS2_LOCK_TYPE_FLOCK, &ocfs2_flock_lops, | |
668 | fp); | |
669 | lockres->l_flags |= OCFS2_LOCK_NOCACHE; | |
670 | } | |
671 | ||
9e33d69f JK |
672 | void ocfs2_qinfo_lock_res_init(struct ocfs2_lock_res *lockres, |
673 | struct ocfs2_mem_dqinfo *info) | |
674 | { | |
675 | ocfs2_lock_res_init_once(lockres); | |
676 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_QINFO, info->dqi_gi.dqi_type, | |
677 | 0, lockres->l_name); | |
678 | ocfs2_lock_res_init_common(OCFS2_SB(info->dqi_gi.dqi_sb), lockres, | |
679 | OCFS2_LOCK_TYPE_QINFO, &ocfs2_qinfo_lops, | |
680 | info); | |
681 | } | |
682 | ||
ccd979bd MF |
683 | void ocfs2_lock_res_free(struct ocfs2_lock_res *res) |
684 | { | |
685 | mlog_entry_void(); | |
686 | ||
687 | if (!(res->l_flags & OCFS2_LOCK_INITIALIZED)) | |
688 | return; | |
689 | ||
690 | ocfs2_remove_lockres_tracking(res); | |
691 | ||
692 | mlog_bug_on_msg(!list_empty(&res->l_blocked_list), | |
693 | "Lockres %s is on the blocked list\n", | |
694 | res->l_name); | |
695 | mlog_bug_on_msg(!list_empty(&res->l_mask_waiters), | |
696 | "Lockres %s has mask waiters pending\n", | |
697 | res->l_name); | |
698 | mlog_bug_on_msg(spin_is_locked(&res->l_lock), | |
699 | "Lockres %s is locked\n", | |
700 | res->l_name); | |
701 | mlog_bug_on_msg(res->l_ro_holders, | |
702 | "Lockres %s has %u ro holders\n", | |
703 | res->l_name, res->l_ro_holders); | |
704 | mlog_bug_on_msg(res->l_ex_holders, | |
705 | "Lockres %s has %u ex holders\n", | |
706 | res->l_name, res->l_ex_holders); | |
707 | ||
708 | /* Need to clear out the lock status block for the dlm */ | |
709 | memset(&res->l_lksb, 0, sizeof(res->l_lksb)); | |
710 | ||
711 | res->l_flags = 0UL; | |
712 | mlog_exit_void(); | |
713 | } | |
714 | ||
715 | static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres, | |
716 | int level) | |
717 | { | |
718 | mlog_entry_void(); | |
719 | ||
720 | BUG_ON(!lockres); | |
721 | ||
722 | switch(level) { | |
bd3e7610 | 723 | case DLM_LOCK_EX: |
ccd979bd MF |
724 | lockres->l_ex_holders++; |
725 | break; | |
bd3e7610 | 726 | case DLM_LOCK_PR: |
ccd979bd MF |
727 | lockres->l_ro_holders++; |
728 | break; | |
729 | default: | |
730 | BUG(); | |
731 | } | |
732 | ||
733 | mlog_exit_void(); | |
734 | } | |
735 | ||
736 | static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres, | |
737 | int level) | |
738 | { | |
739 | mlog_entry_void(); | |
740 | ||
741 | BUG_ON(!lockres); | |
742 | ||
743 | switch(level) { | |
bd3e7610 | 744 | case DLM_LOCK_EX: |
ccd979bd MF |
745 | BUG_ON(!lockres->l_ex_holders); |
746 | lockres->l_ex_holders--; | |
747 | break; | |
bd3e7610 | 748 | case DLM_LOCK_PR: |
ccd979bd MF |
749 | BUG_ON(!lockres->l_ro_holders); |
750 | lockres->l_ro_holders--; | |
751 | break; | |
752 | default: | |
753 | BUG(); | |
754 | } | |
755 | mlog_exit_void(); | |
756 | } | |
757 | ||
758 | /* WARNING: This function lives in a world where the only three lock | |
759 | * levels are EX, PR, and NL. It *will* have to be adjusted when more | |
760 | * lock types are added. */ | |
761 | static inline int ocfs2_highest_compat_lock_level(int level) | |
762 | { | |
bd3e7610 | 763 | int new_level = DLM_LOCK_EX; |
ccd979bd | 764 | |
bd3e7610 JB |
765 | if (level == DLM_LOCK_EX) |
766 | new_level = DLM_LOCK_NL; | |
767 | else if (level == DLM_LOCK_PR) | |
768 | new_level = DLM_LOCK_PR; | |
ccd979bd MF |
769 | return new_level; |
770 | } | |
771 | ||
772 | static void lockres_set_flags(struct ocfs2_lock_res *lockres, | |
773 | unsigned long newflags) | |
774 | { | |
800deef3 | 775 | struct ocfs2_mask_waiter *mw, *tmp; |
ccd979bd MF |
776 | |
777 | assert_spin_locked(&lockres->l_lock); | |
778 | ||
779 | lockres->l_flags = newflags; | |
780 | ||
800deef3 | 781 | list_for_each_entry_safe(mw, tmp, &lockres->l_mask_waiters, mw_item) { |
ccd979bd MF |
782 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) |
783 | continue; | |
784 | ||
785 | list_del_init(&mw->mw_item); | |
786 | mw->mw_status = 0; | |
787 | complete(&mw->mw_complete); | |
788 | } | |
789 | } | |
790 | static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or) | |
791 | { | |
792 | lockres_set_flags(lockres, lockres->l_flags | or); | |
793 | } | |
794 | static void lockres_clear_flags(struct ocfs2_lock_res *lockres, | |
795 | unsigned long clear) | |
796 | { | |
797 | lockres_set_flags(lockres, lockres->l_flags & ~clear); | |
798 | } | |
799 | ||
800 | static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres) | |
801 | { | |
802 | mlog_entry_void(); | |
803 | ||
804 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); | |
805 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); | |
806 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
bd3e7610 | 807 | BUG_ON(lockres->l_blocking <= DLM_LOCK_NL); |
ccd979bd MF |
808 | |
809 | lockres->l_level = lockres->l_requested; | |
810 | if (lockres->l_level <= | |
811 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) { | |
bd3e7610 | 812 | lockres->l_blocking = DLM_LOCK_NL; |
ccd979bd MF |
813 | lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED); |
814 | } | |
815 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
816 | ||
817 | mlog_exit_void(); | |
818 | } | |
819 | ||
820 | static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres) | |
821 | { | |
822 | mlog_entry_void(); | |
823 | ||
824 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); | |
825 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); | |
826 | ||
827 | /* Convert from RO to EX doesn't really need anything as our | |
828 | * information is already up to data. Convert from NL to | |
829 | * *anything* however should mark ourselves as needing an | |
830 | * update */ | |
bd3e7610 | 831 | if (lockres->l_level == DLM_LOCK_NL && |
f625c979 | 832 | lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) |
ccd979bd MF |
833 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
834 | ||
835 | lockres->l_level = lockres->l_requested; | |
836 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
837 | ||
838 | mlog_exit_void(); | |
839 | } | |
840 | ||
841 | static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres) | |
842 | { | |
843 | mlog_entry_void(); | |
844 | ||
3cf0c507 | 845 | BUG_ON((!(lockres->l_flags & OCFS2_LOCK_BUSY))); |
ccd979bd MF |
846 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); |
847 | ||
bd3e7610 | 848 | if (lockres->l_requested > DLM_LOCK_NL && |
f625c979 MF |
849 | !(lockres->l_flags & OCFS2_LOCK_LOCAL) && |
850 | lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) | |
ccd979bd MF |
851 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
852 | ||
853 | lockres->l_level = lockres->l_requested; | |
854 | lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED); | |
855 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
856 | ||
857 | mlog_exit_void(); | |
858 | } | |
859 | ||
ccd979bd MF |
860 | static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, |
861 | int level) | |
862 | { | |
863 | int needs_downconvert = 0; | |
864 | mlog_entry_void(); | |
865 | ||
866 | assert_spin_locked(&lockres->l_lock); | |
867 | ||
868 | lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); | |
869 | ||
870 | if (level > lockres->l_blocking) { | |
871 | /* only schedule a downconvert if we haven't already scheduled | |
872 | * one that goes low enough to satisfy the level we're | |
873 | * blocking. this also catches the case where we get | |
874 | * duplicate BASTs */ | |
875 | if (ocfs2_highest_compat_lock_level(level) < | |
876 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) | |
877 | needs_downconvert = 1; | |
878 | ||
879 | lockres->l_blocking = level; | |
880 | } | |
881 | ||
882 | mlog_exit(needs_downconvert); | |
883 | return needs_downconvert; | |
884 | } | |
885 | ||
de551246 JB |
886 | /* |
887 | * OCFS2_LOCK_PENDING and l_pending_gen. | |
888 | * | |
889 | * Why does OCFS2_LOCK_PENDING exist? To close a race between setting | |
890 | * OCFS2_LOCK_BUSY and calling ocfs2_dlm_lock(). See ocfs2_unblock_lock() | |
891 | * for more details on the race. | |
892 | * | |
893 | * OCFS2_LOCK_PENDING closes the race quite nicely. However, it introduces | |
894 | * a race on itself. In o2dlm, we can get the ast before ocfs2_dlm_lock() | |
895 | * returns. The ast clears OCFS2_LOCK_BUSY, and must therefore clear | |
896 | * OCFS2_LOCK_PENDING at the same time. When ocfs2_dlm_lock() returns, | |
897 | * the caller is going to try to clear PENDING again. If nothing else is | |
898 | * happening, __lockres_clear_pending() sees PENDING is unset and does | |
899 | * nothing. | |
900 | * | |
901 | * But what if another path (eg downconvert thread) has just started a | |
902 | * new locking action? The other path has re-set PENDING. Our path | |
903 | * cannot clear PENDING, because that will re-open the original race | |
904 | * window. | |
905 | * | |
906 | * [Example] | |
907 | * | |
908 | * ocfs2_meta_lock() | |
909 | * ocfs2_cluster_lock() | |
910 | * set BUSY | |
911 | * set PENDING | |
912 | * drop l_lock | |
913 | * ocfs2_dlm_lock() | |
914 | * ocfs2_locking_ast() ocfs2_downconvert_thread() | |
915 | * clear PENDING ocfs2_unblock_lock() | |
916 | * take_l_lock | |
917 | * !BUSY | |
918 | * ocfs2_prepare_downconvert() | |
919 | * set BUSY | |
920 | * set PENDING | |
921 | * drop l_lock | |
922 | * take l_lock | |
923 | * clear PENDING | |
924 | * drop l_lock | |
925 | * <window> | |
926 | * ocfs2_dlm_lock() | |
927 | * | |
928 | * So as you can see, we now have a window where l_lock is not held, | |
929 | * PENDING is not set, and ocfs2_dlm_lock() has not been called. | |
930 | * | |
931 | * The core problem is that ocfs2_cluster_lock() has cleared the PENDING | |
932 | * set by ocfs2_prepare_downconvert(). That wasn't nice. | |
933 | * | |
934 | * To solve this we introduce l_pending_gen. A call to | |
935 | * lockres_clear_pending() will only do so when it is passed a generation | |
936 | * number that matches the lockres. lockres_set_pending() will return the | |
937 | * current generation number. When ocfs2_cluster_lock() goes to clear | |
938 | * PENDING, it passes the generation it got from set_pending(). In our | |
939 | * example above, the generation numbers will *not* match. Thus, | |
940 | * ocfs2_cluster_lock() will not clear the PENDING set by | |
941 | * ocfs2_prepare_downconvert(). | |
942 | */ | |
943 | ||
944 | /* Unlocked version for ocfs2_locking_ast() */ | |
945 | static void __lockres_clear_pending(struct ocfs2_lock_res *lockres, | |
946 | unsigned int generation, | |
947 | struct ocfs2_super *osb) | |
948 | { | |
949 | assert_spin_locked(&lockres->l_lock); | |
950 | ||
951 | /* | |
952 | * The ast and locking functions can race us here. The winner | |
953 | * will clear pending, the loser will not. | |
954 | */ | |
955 | if (!(lockres->l_flags & OCFS2_LOCK_PENDING) || | |
956 | (lockres->l_pending_gen != generation)) | |
957 | return; | |
958 | ||
959 | lockres_clear_flags(lockres, OCFS2_LOCK_PENDING); | |
960 | lockres->l_pending_gen++; | |
961 | ||
962 | /* | |
963 | * The downconvert thread may have skipped us because we | |
964 | * were PENDING. Wake it up. | |
965 | */ | |
966 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) | |
967 | ocfs2_wake_downconvert_thread(osb); | |
968 | } | |
969 | ||
970 | /* Locked version for callers of ocfs2_dlm_lock() */ | |
971 | static void lockres_clear_pending(struct ocfs2_lock_res *lockres, | |
972 | unsigned int generation, | |
973 | struct ocfs2_super *osb) | |
974 | { | |
975 | unsigned long flags; | |
976 | ||
977 | spin_lock_irqsave(&lockres->l_lock, flags); | |
978 | __lockres_clear_pending(lockres, generation, osb); | |
979 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
980 | } | |
981 | ||
982 | static unsigned int lockres_set_pending(struct ocfs2_lock_res *lockres) | |
983 | { | |
984 | assert_spin_locked(&lockres->l_lock); | |
985 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); | |
986 | ||
987 | lockres_or_flags(lockres, OCFS2_LOCK_PENDING); | |
988 | ||
989 | return lockres->l_pending_gen; | |
990 | } | |
991 | ||
992 | ||
aa2623ad | 993 | static void ocfs2_blocking_ast(void *opaque, int level) |
ccd979bd | 994 | { |
aa2623ad MF |
995 | struct ocfs2_lock_res *lockres = opaque; |
996 | struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); | |
ccd979bd MF |
997 | int needs_downconvert; |
998 | unsigned long flags; | |
999 | ||
bd3e7610 | 1000 | BUG_ON(level <= DLM_LOCK_NL); |
ccd979bd | 1001 | |
aa2623ad MF |
1002 | mlog(0, "BAST fired for lockres %s, blocking %d, level %d type %s\n", |
1003 | lockres->l_name, level, lockres->l_level, | |
1004 | ocfs2_lock_type_string(lockres->l_type)); | |
1005 | ||
cf8e06f1 MF |
1006 | /* |
1007 | * We can skip the bast for locks which don't enable caching - | |
1008 | * they'll be dropped at the earliest possible time anyway. | |
1009 | */ | |
1010 | if (lockres->l_flags & OCFS2_LOCK_NOCACHE) | |
1011 | return; | |
1012 | ||
ccd979bd MF |
1013 | spin_lock_irqsave(&lockres->l_lock, flags); |
1014 | needs_downconvert = ocfs2_generic_handle_bast(lockres, level); | |
1015 | if (needs_downconvert) | |
1016 | ocfs2_schedule_blocked_lock(osb, lockres); | |
1017 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1018 | ||
d680efe9 MF |
1019 | wake_up(&lockres->l_event); |
1020 | ||
34d024f8 | 1021 | ocfs2_wake_downconvert_thread(osb); |
ccd979bd MF |
1022 | } |
1023 | ||
e92d57df | 1024 | static void ocfs2_locking_ast(void *opaque) |
ccd979bd | 1025 | { |
e92d57df | 1026 | struct ocfs2_lock_res *lockres = opaque; |
de551246 | 1027 | struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); |
ccd979bd | 1028 | unsigned long flags; |
1693a5c0 | 1029 | int status; |
ccd979bd MF |
1030 | |
1031 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1032 | ||
1693a5c0 DT |
1033 | status = ocfs2_dlm_lock_status(&lockres->l_lksb); |
1034 | ||
1035 | if (status == -EAGAIN) { | |
1036 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
1037 | goto out; | |
1038 | } | |
1039 | ||
1040 | if (status) { | |
8f2c9c1b | 1041 | mlog(ML_ERROR, "lockres %s: lksb status value of %d!\n", |
1693a5c0 | 1042 | lockres->l_name, status); |
ccd979bd MF |
1043 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1044 | return; | |
1045 | } | |
1046 | ||
1047 | switch(lockres->l_action) { | |
1048 | case OCFS2_AST_ATTACH: | |
1049 | ocfs2_generic_handle_attach_action(lockres); | |
e92d57df | 1050 | lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL); |
ccd979bd MF |
1051 | break; |
1052 | case OCFS2_AST_CONVERT: | |
1053 | ocfs2_generic_handle_convert_action(lockres); | |
1054 | break; | |
1055 | case OCFS2_AST_DOWNCONVERT: | |
1056 | ocfs2_generic_handle_downconvert_action(lockres); | |
1057 | break; | |
1058 | default: | |
e92d57df MF |
1059 | mlog(ML_ERROR, "lockres %s: ast fired with invalid action: %u " |
1060 | "lockres flags = 0x%lx, unlock action: %u\n", | |
1061 | lockres->l_name, lockres->l_action, lockres->l_flags, | |
1062 | lockres->l_unlock_action); | |
ccd979bd MF |
1063 | BUG(); |
1064 | } | |
1693a5c0 | 1065 | out: |
ccd979bd MF |
1066 | /* set it to something invalid so if we get called again we |
1067 | * can catch it. */ | |
1068 | lockres->l_action = OCFS2_AST_INVALID; | |
ccd979bd | 1069 | |
de551246 JB |
1070 | /* Did we try to cancel this lock? Clear that state */ |
1071 | if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) | |
1072 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
1073 | ||
1074 | /* | |
1075 | * We may have beaten the locking functions here. We certainly | |
1076 | * know that dlm_lock() has been called :-) | |
1077 | * Because we can't have two lock calls in flight at once, we | |
1078 | * can use lockres->l_pending_gen. | |
1079 | */ | |
1080 | __lockres_clear_pending(lockres, lockres->l_pending_gen, osb); | |
1081 | ||
ccd979bd | 1082 | wake_up(&lockres->l_event); |
d680efe9 | 1083 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
ccd979bd MF |
1084 | } |
1085 | ||
ccd979bd MF |
1086 | static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, |
1087 | int convert) | |
1088 | { | |
1089 | unsigned long flags; | |
1090 | ||
1091 | mlog_entry_void(); | |
1092 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1093 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
1094 | if (convert) | |
1095 | lockres->l_action = OCFS2_AST_INVALID; | |
1096 | else | |
1097 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
1098 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1099 | ||
1100 | wake_up(&lockres->l_event); | |
1101 | mlog_exit_void(); | |
1102 | } | |
1103 | ||
1104 | /* Note: If we detect another process working on the lock (i.e., | |
1105 | * OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller | |
1106 | * to do the right thing in that case. | |
1107 | */ | |
1108 | static int ocfs2_lock_create(struct ocfs2_super *osb, | |
1109 | struct ocfs2_lock_res *lockres, | |
1110 | int level, | |
bd3e7610 | 1111 | u32 dlm_flags) |
ccd979bd MF |
1112 | { |
1113 | int ret = 0; | |
ccd979bd | 1114 | unsigned long flags; |
de551246 | 1115 | unsigned int gen; |
ccd979bd MF |
1116 | |
1117 | mlog_entry_void(); | |
1118 | ||
bd3e7610 | 1119 | mlog(0, "lock %s, level = %d, flags = %u\n", lockres->l_name, level, |
ccd979bd MF |
1120 | dlm_flags); |
1121 | ||
1122 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1123 | if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) || | |
1124 | (lockres->l_flags & OCFS2_LOCK_BUSY)) { | |
1125 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1126 | goto bail; | |
1127 | } | |
1128 | ||
1129 | lockres->l_action = OCFS2_AST_ATTACH; | |
1130 | lockres->l_requested = level; | |
1131 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
de551246 | 1132 | gen = lockres_set_pending(lockres); |
ccd979bd MF |
1133 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1134 | ||
4670c46d | 1135 | ret = ocfs2_dlm_lock(osb->cconn, |
7431cd7e JB |
1136 | level, |
1137 | &lockres->l_lksb, | |
1138 | dlm_flags, | |
1139 | lockres->l_name, | |
1140 | OCFS2_LOCK_ID_MAX_LEN - 1, | |
1141 | lockres); | |
de551246 | 1142 | lockres_clear_pending(lockres, gen, osb); |
7431cd7e JB |
1143 | if (ret) { |
1144 | ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres); | |
ccd979bd MF |
1145 | ocfs2_recover_from_dlm_error(lockres, 1); |
1146 | } | |
1147 | ||
7431cd7e | 1148 | mlog(0, "lock %s, return from ocfs2_dlm_lock\n", lockres->l_name); |
ccd979bd MF |
1149 | |
1150 | bail: | |
1151 | mlog_exit(ret); | |
1152 | return ret; | |
1153 | } | |
1154 | ||
1155 | static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres, | |
1156 | int flag) | |
1157 | { | |
1158 | unsigned long flags; | |
1159 | int ret; | |
1160 | ||
1161 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1162 | ret = lockres->l_flags & flag; | |
1163 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1164 | ||
1165 | return ret; | |
1166 | } | |
1167 | ||
1168 | static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres) | |
1169 | ||
1170 | { | |
1171 | wait_event(lockres->l_event, | |
1172 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY)); | |
1173 | } | |
1174 | ||
1175 | static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres) | |
1176 | ||
1177 | { | |
1178 | wait_event(lockres->l_event, | |
1179 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING)); | |
1180 | } | |
1181 | ||
1182 | /* predict what lock level we'll be dropping down to on behalf | |
1183 | * of another node, and return true if the currently wanted | |
1184 | * level will be compatible with it. */ | |
1185 | static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, | |
1186 | int wanted) | |
1187 | { | |
1188 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
1189 | ||
1190 | return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking); | |
1191 | } | |
1192 | ||
1193 | static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw) | |
1194 | { | |
1195 | INIT_LIST_HEAD(&mw->mw_item); | |
1196 | init_completion(&mw->mw_complete); | |
8ddb7b00 | 1197 | ocfs2_init_start_time(mw); |
ccd979bd MF |
1198 | } |
1199 | ||
1200 | static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw) | |
1201 | { | |
1202 | wait_for_completion(&mw->mw_complete); | |
1203 | /* Re-arm the completion in case we want to wait on it again */ | |
1204 | INIT_COMPLETION(mw->mw_complete); | |
1205 | return mw->mw_status; | |
1206 | } | |
1207 | ||
1208 | static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres, | |
1209 | struct ocfs2_mask_waiter *mw, | |
1210 | unsigned long mask, | |
1211 | unsigned long goal) | |
1212 | { | |
1213 | BUG_ON(!list_empty(&mw->mw_item)); | |
1214 | ||
1215 | assert_spin_locked(&lockres->l_lock); | |
1216 | ||
1217 | list_add_tail(&mw->mw_item, &lockres->l_mask_waiters); | |
1218 | mw->mw_mask = mask; | |
1219 | mw->mw_goal = goal; | |
1220 | } | |
1221 | ||
1222 | /* returns 0 if the mw that was removed was already satisfied, -EBUSY | |
1223 | * if the mask still hadn't reached its goal */ | |
1224 | static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres, | |
1225 | struct ocfs2_mask_waiter *mw) | |
1226 | { | |
1227 | unsigned long flags; | |
1228 | int ret = 0; | |
1229 | ||
1230 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1231 | if (!list_empty(&mw->mw_item)) { | |
1232 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) | |
1233 | ret = -EBUSY; | |
1234 | ||
1235 | list_del_init(&mw->mw_item); | |
1236 | init_completion(&mw->mw_complete); | |
1237 | } | |
1238 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1239 | ||
1240 | return ret; | |
1241 | ||
1242 | } | |
1243 | ||
cf8e06f1 MF |
1244 | static int ocfs2_wait_for_mask_interruptible(struct ocfs2_mask_waiter *mw, |
1245 | struct ocfs2_lock_res *lockres) | |
1246 | { | |
1247 | int ret; | |
1248 | ||
1249 | ret = wait_for_completion_interruptible(&mw->mw_complete); | |
1250 | if (ret) | |
1251 | lockres_remove_mask_waiter(lockres, mw); | |
1252 | else | |
1253 | ret = mw->mw_status; | |
1254 | /* Re-arm the completion in case we want to wait on it again */ | |
1255 | INIT_COMPLETION(mw->mw_complete); | |
1256 | return ret; | |
1257 | } | |
1258 | ||
ccd979bd MF |
1259 | static int ocfs2_cluster_lock(struct ocfs2_super *osb, |
1260 | struct ocfs2_lock_res *lockres, | |
1261 | int level, | |
bd3e7610 | 1262 | u32 lkm_flags, |
ccd979bd MF |
1263 | int arg_flags) |
1264 | { | |
1265 | struct ocfs2_mask_waiter mw; | |
ccd979bd MF |
1266 | int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR); |
1267 | int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */ | |
1268 | unsigned long flags; | |
de551246 | 1269 | unsigned int gen; |
1693a5c0 | 1270 | int noqueue_attempted = 0; |
ccd979bd MF |
1271 | |
1272 | mlog_entry_void(); | |
1273 | ||
1274 | ocfs2_init_mask_waiter(&mw); | |
1275 | ||
b80fc012 | 1276 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
bd3e7610 | 1277 | lkm_flags |= DLM_LKF_VALBLK; |
b80fc012 | 1278 | |
ccd979bd MF |
1279 | again: |
1280 | wait = 0; | |
1281 | ||
1282 | if (catch_signals && signal_pending(current)) { | |
1283 | ret = -ERESTARTSYS; | |
1284 | goto out; | |
1285 | } | |
1286 | ||
1287 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1288 | ||
1289 | mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING, | |
1290 | "Cluster lock called on freeing lockres %s! flags " | |
1291 | "0x%lx\n", lockres->l_name, lockres->l_flags); | |
1292 | ||
1293 | /* We only compare against the currently granted level | |
1294 | * here. If the lock is blocked waiting on a downconvert, | |
1295 | * we'll get caught below. */ | |
1296 | if (lockres->l_flags & OCFS2_LOCK_BUSY && | |
1297 | level > lockres->l_level) { | |
1298 | /* is someone sitting in dlm_lock? If so, wait on | |
1299 | * them. */ | |
1300 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
1301 | wait = 1; | |
1302 | goto unlock; | |
1303 | } | |
1304 | ||
ccd979bd MF |
1305 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED && |
1306 | !ocfs2_may_continue_on_blocked_lock(lockres, level)) { | |
1307 | /* is the lock is currently blocked on behalf of | |
1308 | * another node */ | |
1309 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0); | |
1310 | wait = 1; | |
1311 | goto unlock; | |
1312 | } | |
1313 | ||
1314 | if (level > lockres->l_level) { | |
1693a5c0 DT |
1315 | if (noqueue_attempted > 0) { |
1316 | ret = -EAGAIN; | |
1317 | goto unlock; | |
1318 | } | |
1319 | if (lkm_flags & DLM_LKF_NOQUEUE) | |
1320 | noqueue_attempted = 1; | |
1321 | ||
ccd979bd MF |
1322 | if (lockres->l_action != OCFS2_AST_INVALID) |
1323 | mlog(ML_ERROR, "lockres %s has action %u pending\n", | |
1324 | lockres->l_name, lockres->l_action); | |
1325 | ||
019d1b22 MF |
1326 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { |
1327 | lockres->l_action = OCFS2_AST_ATTACH; | |
bd3e7610 | 1328 | lkm_flags &= ~DLM_LKF_CONVERT; |
019d1b22 MF |
1329 | } else { |
1330 | lockres->l_action = OCFS2_AST_CONVERT; | |
bd3e7610 | 1331 | lkm_flags |= DLM_LKF_CONVERT; |
019d1b22 MF |
1332 | } |
1333 | ||
ccd979bd MF |
1334 | lockres->l_requested = level; |
1335 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
de551246 | 1336 | gen = lockres_set_pending(lockres); |
ccd979bd MF |
1337 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1338 | ||
bd3e7610 JB |
1339 | BUG_ON(level == DLM_LOCK_IV); |
1340 | BUG_ON(level == DLM_LOCK_NL); | |
ccd979bd MF |
1341 | |
1342 | mlog(0, "lock %s, convert from %d to level = %d\n", | |
1343 | lockres->l_name, lockres->l_level, level); | |
1344 | ||
1345 | /* call dlm_lock to upgrade lock now */ | |
4670c46d | 1346 | ret = ocfs2_dlm_lock(osb->cconn, |
7431cd7e JB |
1347 | level, |
1348 | &lockres->l_lksb, | |
1349 | lkm_flags, | |
1350 | lockres->l_name, | |
1351 | OCFS2_LOCK_ID_MAX_LEN - 1, | |
1352 | lockres); | |
de551246 | 1353 | lockres_clear_pending(lockres, gen, osb); |
7431cd7e JB |
1354 | if (ret) { |
1355 | if (!(lkm_flags & DLM_LKF_NOQUEUE) || | |
1356 | (ret != -EAGAIN)) { | |
24ef1815 | 1357 | ocfs2_log_dlm_error("ocfs2_dlm_lock", |
7431cd7e | 1358 | ret, lockres); |
ccd979bd MF |
1359 | } |
1360 | ocfs2_recover_from_dlm_error(lockres, 1); | |
1361 | goto out; | |
1362 | } | |
1363 | ||
73ac36ea | 1364 | mlog(0, "lock %s, successful return from ocfs2_dlm_lock\n", |
ccd979bd MF |
1365 | lockres->l_name); |
1366 | ||
1367 | /* At this point we've gone inside the dlm and need to | |
1368 | * complete our work regardless. */ | |
1369 | catch_signals = 0; | |
1370 | ||
1371 | /* wait for busy to clear and carry on */ | |
1372 | goto again; | |
1373 | } | |
1374 | ||
1375 | /* Ok, if we get here then we're good to go. */ | |
1376 | ocfs2_inc_holders(lockres, level); | |
1377 | ||
1378 | ret = 0; | |
1379 | unlock: | |
1380 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1381 | out: | |
1382 | /* | |
1383 | * This is helping work around a lock inversion between the page lock | |
1384 | * and dlm locks. One path holds the page lock while calling aops | |
1385 | * which block acquiring dlm locks. The voting thread holds dlm | |
1386 | * locks while acquiring page locks while down converting data locks. | |
1387 | * This block is helping an aop path notice the inversion and back | |
1388 | * off to unlock its page lock before trying the dlm lock again. | |
1389 | */ | |
1390 | if (wait && arg_flags & OCFS2_LOCK_NONBLOCK && | |
1391 | mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) { | |
1392 | wait = 0; | |
1393 | if (lockres_remove_mask_waiter(lockres, &mw)) | |
1394 | ret = -EAGAIN; | |
1395 | else | |
1396 | goto again; | |
1397 | } | |
1398 | if (wait) { | |
1399 | ret = ocfs2_wait_for_mask(&mw); | |
1400 | if (ret == 0) | |
1401 | goto again; | |
1402 | mlog_errno(ret); | |
1403 | } | |
8ddb7b00 | 1404 | ocfs2_update_lock_stats(lockres, level, &mw, ret); |
ccd979bd MF |
1405 | |
1406 | mlog_exit(ret); | |
1407 | return ret; | |
1408 | } | |
1409 | ||
1410 | static void ocfs2_cluster_unlock(struct ocfs2_super *osb, | |
1411 | struct ocfs2_lock_res *lockres, | |
1412 | int level) | |
1413 | { | |
1414 | unsigned long flags; | |
1415 | ||
1416 | mlog_entry_void(); | |
1417 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1418 | ocfs2_dec_holders(lockres, level); | |
34d024f8 | 1419 | ocfs2_downconvert_on_unlock(osb, lockres); |
ccd979bd MF |
1420 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1421 | mlog_exit_void(); | |
1422 | } | |
1423 | ||
da66116e AB |
1424 | static int ocfs2_create_new_lock(struct ocfs2_super *osb, |
1425 | struct ocfs2_lock_res *lockres, | |
1426 | int ex, | |
1427 | int local) | |
ccd979bd | 1428 | { |
bd3e7610 | 1429 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd | 1430 | unsigned long flags; |
bd3e7610 | 1431 | u32 lkm_flags = local ? DLM_LKF_LOCAL : 0; |
ccd979bd MF |
1432 | |
1433 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1434 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); | |
1435 | lockres_or_flags(lockres, OCFS2_LOCK_LOCAL); | |
1436 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1437 | ||
24c19ef4 | 1438 | return ocfs2_lock_create(osb, lockres, level, lkm_flags); |
ccd979bd MF |
1439 | } |
1440 | ||
1441 | /* Grants us an EX lock on the data and metadata resources, skipping | |
1442 | * the normal cluster directory lookup. Use this ONLY on newly created | |
1443 | * inodes which other nodes can't possibly see, and which haven't been | |
1444 | * hashed in the inode hash yet. This can give us a good performance | |
1445 | * increase as it'll skip the network broadcast normally associated | |
1446 | * with creating a new lock resource. */ | |
1447 | int ocfs2_create_new_inode_locks(struct inode *inode) | |
1448 | { | |
1449 | int ret; | |
d680efe9 | 1450 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
1451 | |
1452 | BUG_ON(!inode); | |
1453 | BUG_ON(!ocfs2_inode_is_new(inode)); | |
1454 | ||
1455 | mlog_entry_void(); | |
1456 | ||
b0697053 | 1457 | mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno); |
ccd979bd MF |
1458 | |
1459 | /* NOTE: That we don't increment any of the holder counts, nor | |
1460 | * do we add anything to a journal handle. Since this is | |
1461 | * supposed to be a new inode which the cluster doesn't know | |
1462 | * about yet, there is no need to. As far as the LVB handling | |
1463 | * is concerned, this is basically like acquiring an EX lock | |
1464 | * on a resource which has an invalid one -- we'll set it | |
1465 | * valid when we release the EX. */ | |
1466 | ||
24c19ef4 | 1467 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_rw_lockres, 1, 1); |
ccd979bd MF |
1468 | if (ret) { |
1469 | mlog_errno(ret); | |
1470 | goto bail; | |
1471 | } | |
1472 | ||
24c19ef4 | 1473 | /* |
bd3e7610 | 1474 | * We don't want to use DLM_LKF_LOCAL on a meta data lock as they |
24c19ef4 MF |
1475 | * don't use a generation in their lock names. |
1476 | */ | |
e63aecb6 | 1477 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_inode_lockres, 1, 0); |
ccd979bd MF |
1478 | if (ret) { |
1479 | mlog_errno(ret); | |
1480 | goto bail; | |
1481 | } | |
1482 | ||
50008630 TY |
1483 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_open_lockres, 0, 0); |
1484 | if (ret) { | |
1485 | mlog_errno(ret); | |
1486 | goto bail; | |
1487 | } | |
1488 | ||
ccd979bd MF |
1489 | bail: |
1490 | mlog_exit(ret); | |
1491 | return ret; | |
1492 | } | |
1493 | ||
1494 | int ocfs2_rw_lock(struct inode *inode, int write) | |
1495 | { | |
1496 | int status, level; | |
1497 | struct ocfs2_lock_res *lockres; | |
c271c5c2 | 1498 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
1499 | |
1500 | BUG_ON(!inode); | |
1501 | ||
1502 | mlog_entry_void(); | |
1503 | ||
b0697053 MF |
1504 | mlog(0, "inode %llu take %s RW lock\n", |
1505 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1506 | write ? "EXMODE" : "PRMODE"); |
1507 | ||
c271c5c2 SM |
1508 | if (ocfs2_mount_local(osb)) |
1509 | return 0; | |
1510 | ||
ccd979bd MF |
1511 | lockres = &OCFS2_I(inode)->ip_rw_lockres; |
1512 | ||
bd3e7610 | 1513 | level = write ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd MF |
1514 | |
1515 | status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, 0, | |
1516 | 0); | |
1517 | if (status < 0) | |
1518 | mlog_errno(status); | |
1519 | ||
1520 | mlog_exit(status); | |
1521 | return status; | |
1522 | } | |
1523 | ||
1524 | void ocfs2_rw_unlock(struct inode *inode, int write) | |
1525 | { | |
bd3e7610 | 1526 | int level = write ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd | 1527 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres; |
c271c5c2 | 1528 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
1529 | |
1530 | mlog_entry_void(); | |
1531 | ||
b0697053 MF |
1532 | mlog(0, "inode %llu drop %s RW lock\n", |
1533 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1534 | write ? "EXMODE" : "PRMODE"); |
1535 | ||
c271c5c2 SM |
1536 | if (!ocfs2_mount_local(osb)) |
1537 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); | |
ccd979bd MF |
1538 | |
1539 | mlog_exit_void(); | |
1540 | } | |
1541 | ||
50008630 TY |
1542 | /* |
1543 | * ocfs2_open_lock always get PR mode lock. | |
1544 | */ | |
1545 | int ocfs2_open_lock(struct inode *inode) | |
1546 | { | |
1547 | int status = 0; | |
1548 | struct ocfs2_lock_res *lockres; | |
1549 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1550 | ||
1551 | BUG_ON(!inode); | |
1552 | ||
1553 | mlog_entry_void(); | |
1554 | ||
1555 | mlog(0, "inode %llu take PRMODE open lock\n", | |
1556 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
1557 | ||
1558 | if (ocfs2_mount_local(osb)) | |
1559 | goto out; | |
1560 | ||
1561 | lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1562 | ||
1563 | status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, | |
bd3e7610 | 1564 | DLM_LOCK_PR, 0, 0); |
50008630 TY |
1565 | if (status < 0) |
1566 | mlog_errno(status); | |
1567 | ||
1568 | out: | |
1569 | mlog_exit(status); | |
1570 | return status; | |
1571 | } | |
1572 | ||
1573 | int ocfs2_try_open_lock(struct inode *inode, int write) | |
1574 | { | |
1575 | int status = 0, level; | |
1576 | struct ocfs2_lock_res *lockres; | |
1577 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1578 | ||
1579 | BUG_ON(!inode); | |
1580 | ||
1581 | mlog_entry_void(); | |
1582 | ||
1583 | mlog(0, "inode %llu try to take %s open lock\n", | |
1584 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
1585 | write ? "EXMODE" : "PRMODE"); | |
1586 | ||
1587 | if (ocfs2_mount_local(osb)) | |
1588 | goto out; | |
1589 | ||
1590 | lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1591 | ||
bd3e7610 | 1592 | level = write ? DLM_LOCK_EX : DLM_LOCK_PR; |
50008630 TY |
1593 | |
1594 | /* | |
1595 | * The file system may already holding a PRMODE/EXMODE open lock. | |
bd3e7610 | 1596 | * Since we pass DLM_LKF_NOQUEUE, the request won't block waiting on |
50008630 TY |
1597 | * other nodes and the -EAGAIN will indicate to the caller that |
1598 | * this inode is still in use. | |
1599 | */ | |
1600 | status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, | |
bd3e7610 | 1601 | level, DLM_LKF_NOQUEUE, 0); |
50008630 TY |
1602 | |
1603 | out: | |
1604 | mlog_exit(status); | |
1605 | return status; | |
1606 | } | |
1607 | ||
1608 | /* | |
1609 | * ocfs2_open_unlock unlock PR and EX mode open locks. | |
1610 | */ | |
1611 | void ocfs2_open_unlock(struct inode *inode) | |
1612 | { | |
1613 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1614 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1615 | ||
1616 | mlog_entry_void(); | |
1617 | ||
1618 | mlog(0, "inode %llu drop open lock\n", | |
1619 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
1620 | ||
1621 | if (ocfs2_mount_local(osb)) | |
1622 | goto out; | |
1623 | ||
1624 | if(lockres->l_ro_holders) | |
1625 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, | |
bd3e7610 | 1626 | DLM_LOCK_PR); |
50008630 TY |
1627 | if(lockres->l_ex_holders) |
1628 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, | |
bd3e7610 | 1629 | DLM_LOCK_EX); |
50008630 TY |
1630 | |
1631 | out: | |
1632 | mlog_exit_void(); | |
1633 | } | |
1634 | ||
cf8e06f1 MF |
1635 | static int ocfs2_flock_handle_signal(struct ocfs2_lock_res *lockres, |
1636 | int level) | |
1637 | { | |
1638 | int ret; | |
1639 | struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); | |
1640 | unsigned long flags; | |
1641 | struct ocfs2_mask_waiter mw; | |
1642 | ||
1643 | ocfs2_init_mask_waiter(&mw); | |
1644 | ||
1645 | retry_cancel: | |
1646 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1647 | if (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
1648 | ret = ocfs2_prepare_cancel_convert(osb, lockres); | |
1649 | if (ret) { | |
1650 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1651 | ret = ocfs2_cancel_convert(osb, lockres); | |
1652 | if (ret < 0) { | |
1653 | mlog_errno(ret); | |
1654 | goto out; | |
1655 | } | |
1656 | goto retry_cancel; | |
1657 | } | |
1658 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
1659 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1660 | ||
1661 | ocfs2_wait_for_mask(&mw); | |
1662 | goto retry_cancel; | |
1663 | } | |
1664 | ||
1665 | ret = -ERESTARTSYS; | |
1666 | /* | |
1667 | * We may still have gotten the lock, in which case there's no | |
1668 | * point to restarting the syscall. | |
1669 | */ | |
1670 | if (lockres->l_level == level) | |
1671 | ret = 0; | |
1672 | ||
1673 | mlog(0, "Cancel returning %d. flags: 0x%lx, level: %d, act: %d\n", ret, | |
1674 | lockres->l_flags, lockres->l_level, lockres->l_action); | |
1675 | ||
1676 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1677 | ||
1678 | out: | |
1679 | return ret; | |
1680 | } | |
1681 | ||
1682 | /* | |
1683 | * ocfs2_file_lock() and ocfs2_file_unlock() map to a single pair of | |
1684 | * flock() calls. The locking approach this requires is sufficiently | |
1685 | * different from all other cluster lock types that we implement a | |
1686 | * seperate path to the "low-level" dlm calls. In particular: | |
1687 | * | |
1688 | * - No optimization of lock levels is done - we take at exactly | |
1689 | * what's been requested. | |
1690 | * | |
1691 | * - No lock caching is employed. We immediately downconvert to | |
1692 | * no-lock at unlock time. This also means flock locks never go on | |
1693 | * the blocking list). | |
1694 | * | |
1695 | * - Since userspace can trivially deadlock itself with flock, we make | |
1696 | * sure to allow cancellation of a misbehaving applications flock() | |
1697 | * request. | |
1698 | * | |
1699 | * - Access to any flock lockres doesn't require concurrency, so we | |
1700 | * can simplify the code by requiring the caller to guarantee | |
1701 | * serialization of dlmglue flock calls. | |
1702 | */ | |
1703 | int ocfs2_file_lock(struct file *file, int ex, int trylock) | |
1704 | { | |
e988cf1c MF |
1705 | int ret, level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
1706 | unsigned int lkm_flags = trylock ? DLM_LKF_NOQUEUE : 0; | |
cf8e06f1 MF |
1707 | unsigned long flags; |
1708 | struct ocfs2_file_private *fp = file->private_data; | |
1709 | struct ocfs2_lock_res *lockres = &fp->fp_flock; | |
1710 | struct ocfs2_super *osb = OCFS2_SB(file->f_mapping->host->i_sb); | |
1711 | struct ocfs2_mask_waiter mw; | |
1712 | ||
1713 | ocfs2_init_mask_waiter(&mw); | |
1714 | ||
1715 | if ((lockres->l_flags & OCFS2_LOCK_BUSY) || | |
bd3e7610 | 1716 | (lockres->l_level > DLM_LOCK_NL)) { |
cf8e06f1 MF |
1717 | mlog(ML_ERROR, |
1718 | "File lock \"%s\" has busy or locked state: flags: 0x%lx, " | |
1719 | "level: %u\n", lockres->l_name, lockres->l_flags, | |
1720 | lockres->l_level); | |
1721 | return -EINVAL; | |
1722 | } | |
1723 | ||
1724 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1725 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { | |
1726 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
1727 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1728 | ||
1729 | /* | |
1730 | * Get the lock at NLMODE to start - that way we | |
1731 | * can cancel the upconvert request if need be. | |
1732 | */ | |
e988cf1c | 1733 | ret = ocfs2_lock_create(osb, lockres, DLM_LOCK_NL, 0); |
cf8e06f1 MF |
1734 | if (ret < 0) { |
1735 | mlog_errno(ret); | |
1736 | goto out; | |
1737 | } | |
1738 | ||
1739 | ret = ocfs2_wait_for_mask(&mw); | |
1740 | if (ret) { | |
1741 | mlog_errno(ret); | |
1742 | goto out; | |
1743 | } | |
1744 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1745 | } | |
1746 | ||
1747 | lockres->l_action = OCFS2_AST_CONVERT; | |
e988cf1c | 1748 | lkm_flags |= DLM_LKF_CONVERT; |
cf8e06f1 MF |
1749 | lockres->l_requested = level; |
1750 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
1751 | ||
1752 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
1753 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1754 | ||
4670c46d | 1755 | ret = ocfs2_dlm_lock(osb->cconn, level, &lockres->l_lksb, lkm_flags, |
24ef1815 JB |
1756 | lockres->l_name, OCFS2_LOCK_ID_MAX_LEN - 1, |
1757 | lockres); | |
7431cd7e JB |
1758 | if (ret) { |
1759 | if (!trylock || (ret != -EAGAIN)) { | |
24ef1815 | 1760 | ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres); |
cf8e06f1 MF |
1761 | ret = -EINVAL; |
1762 | } | |
1763 | ||
1764 | ocfs2_recover_from_dlm_error(lockres, 1); | |
1765 | lockres_remove_mask_waiter(lockres, &mw); | |
1766 | goto out; | |
1767 | } | |
1768 | ||
1769 | ret = ocfs2_wait_for_mask_interruptible(&mw, lockres); | |
1770 | if (ret == -ERESTARTSYS) { | |
1771 | /* | |
1772 | * Userspace can cause deadlock itself with | |
1773 | * flock(). Current behavior locally is to allow the | |
1774 | * deadlock, but abort the system call if a signal is | |
1775 | * received. We follow this example, otherwise a | |
1776 | * poorly written program could sit in kernel until | |
1777 | * reboot. | |
1778 | * | |
1779 | * Handling this is a bit more complicated for Ocfs2 | |
1780 | * though. We can't exit this function with an | |
1781 | * outstanding lock request, so a cancel convert is | |
1782 | * required. We intentionally overwrite 'ret' - if the | |
1783 | * cancel fails and the lock was granted, it's easier | |
1784 | * to just bubble sucess back up to the user. | |
1785 | */ | |
1786 | ret = ocfs2_flock_handle_signal(lockres, level); | |
1693a5c0 DT |
1787 | } else if (!ret && (level > lockres->l_level)) { |
1788 | /* Trylock failed asynchronously */ | |
1789 | BUG_ON(!trylock); | |
1790 | ret = -EAGAIN; | |
cf8e06f1 MF |
1791 | } |
1792 | ||
1793 | out: | |
1794 | ||
1795 | mlog(0, "Lock: \"%s\" ex: %d, trylock: %d, returns: %d\n", | |
1796 | lockres->l_name, ex, trylock, ret); | |
1797 | return ret; | |
1798 | } | |
1799 | ||
1800 | void ocfs2_file_unlock(struct file *file) | |
1801 | { | |
1802 | int ret; | |
de551246 | 1803 | unsigned int gen; |
cf8e06f1 MF |
1804 | unsigned long flags; |
1805 | struct ocfs2_file_private *fp = file->private_data; | |
1806 | struct ocfs2_lock_res *lockres = &fp->fp_flock; | |
1807 | struct ocfs2_super *osb = OCFS2_SB(file->f_mapping->host->i_sb); | |
1808 | struct ocfs2_mask_waiter mw; | |
1809 | ||
1810 | ocfs2_init_mask_waiter(&mw); | |
1811 | ||
1812 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) | |
1813 | return; | |
1814 | ||
e988cf1c | 1815 | if (lockres->l_level == DLM_LOCK_NL) |
cf8e06f1 MF |
1816 | return; |
1817 | ||
1818 | mlog(0, "Unlock: \"%s\" flags: 0x%lx, level: %d, act: %d\n", | |
1819 | lockres->l_name, lockres->l_flags, lockres->l_level, | |
1820 | lockres->l_action); | |
1821 | ||
1822 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1823 | /* | |
1824 | * Fake a blocking ast for the downconvert code. | |
1825 | */ | |
1826 | lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); | |
bd3e7610 | 1827 | lockres->l_blocking = DLM_LOCK_EX; |
cf8e06f1 | 1828 | |
e988cf1c | 1829 | gen = ocfs2_prepare_downconvert(lockres, DLM_LOCK_NL); |
cf8e06f1 MF |
1830 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); |
1831 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1832 | ||
e988cf1c | 1833 | ret = ocfs2_downconvert_lock(osb, lockres, DLM_LOCK_NL, 0, gen); |
cf8e06f1 MF |
1834 | if (ret) { |
1835 | mlog_errno(ret); | |
1836 | return; | |
1837 | } | |
1838 | ||
1839 | ret = ocfs2_wait_for_mask(&mw); | |
1840 | if (ret) | |
1841 | mlog_errno(ret); | |
1842 | } | |
1843 | ||
34d024f8 MF |
1844 | static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb, |
1845 | struct ocfs2_lock_res *lockres) | |
ccd979bd MF |
1846 | { |
1847 | int kick = 0; | |
1848 | ||
1849 | mlog_entry_void(); | |
1850 | ||
1851 | /* If we know that another node is waiting on our lock, kick | |
34d024f8 | 1852 | * the downconvert thread * pre-emptively when we reach a release |
ccd979bd MF |
1853 | * condition. */ |
1854 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) { | |
1855 | switch(lockres->l_blocking) { | |
bd3e7610 | 1856 | case DLM_LOCK_EX: |
ccd979bd MF |
1857 | if (!lockres->l_ex_holders && !lockres->l_ro_holders) |
1858 | kick = 1; | |
1859 | break; | |
bd3e7610 | 1860 | case DLM_LOCK_PR: |
ccd979bd MF |
1861 | if (!lockres->l_ex_holders) |
1862 | kick = 1; | |
1863 | break; | |
1864 | default: | |
1865 | BUG(); | |
1866 | } | |
1867 | } | |
1868 | ||
1869 | if (kick) | |
34d024f8 | 1870 | ocfs2_wake_downconvert_thread(osb); |
ccd979bd MF |
1871 | |
1872 | mlog_exit_void(); | |
1873 | } | |
1874 | ||
ccd979bd MF |
1875 | #define OCFS2_SEC_BITS 34 |
1876 | #define OCFS2_SEC_SHIFT (64 - 34) | |
1877 | #define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1) | |
1878 | ||
1879 | /* LVB only has room for 64 bits of time here so we pack it for | |
1880 | * now. */ | |
1881 | static u64 ocfs2_pack_timespec(struct timespec *spec) | |
1882 | { | |
1883 | u64 res; | |
1884 | u64 sec = spec->tv_sec; | |
1885 | u32 nsec = spec->tv_nsec; | |
1886 | ||
1887 | res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK); | |
1888 | ||
1889 | return res; | |
1890 | } | |
1891 | ||
1892 | /* Call this with the lockres locked. I am reasonably sure we don't | |
1893 | * need ip_lock in this function as anyone who would be changing those | |
e63aecb6 | 1894 | * values is supposed to be blocked in ocfs2_inode_lock right now. */ |
ccd979bd MF |
1895 | static void __ocfs2_stuff_meta_lvb(struct inode *inode) |
1896 | { | |
1897 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
e63aecb6 | 1898 | struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
ccd979bd MF |
1899 | struct ocfs2_meta_lvb *lvb; |
1900 | ||
1901 | mlog_entry_void(); | |
1902 | ||
a641dc2a | 1903 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
ccd979bd | 1904 | |
24c19ef4 MF |
1905 | /* |
1906 | * Invalidate the LVB of a deleted inode - this way other | |
1907 | * nodes are forced to go to disk and discover the new inode | |
1908 | * status. | |
1909 | */ | |
1910 | if (oi->ip_flags & OCFS2_INODE_DELETED) { | |
1911 | lvb->lvb_version = 0; | |
1912 | goto out; | |
1913 | } | |
1914 | ||
4d3b83f7 | 1915 | lvb->lvb_version = OCFS2_LVB_VERSION; |
ccd979bd MF |
1916 | lvb->lvb_isize = cpu_to_be64(i_size_read(inode)); |
1917 | lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters); | |
1918 | lvb->lvb_iuid = cpu_to_be32(inode->i_uid); | |
1919 | lvb->lvb_igid = cpu_to_be32(inode->i_gid); | |
1920 | lvb->lvb_imode = cpu_to_be16(inode->i_mode); | |
1921 | lvb->lvb_inlink = cpu_to_be16(inode->i_nlink); | |
1922 | lvb->lvb_iatime_packed = | |
1923 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime)); | |
1924 | lvb->lvb_ictime_packed = | |
1925 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime)); | |
1926 | lvb->lvb_imtime_packed = | |
1927 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime)); | |
ca4d147e | 1928 | lvb->lvb_iattr = cpu_to_be32(oi->ip_attr); |
15b1e36b | 1929 | lvb->lvb_idynfeatures = cpu_to_be16(oi->ip_dyn_features); |
f9e2d82e | 1930 | lvb->lvb_igeneration = cpu_to_be32(inode->i_generation); |
ccd979bd | 1931 | |
24c19ef4 | 1932 | out: |
ccd979bd MF |
1933 | mlog_meta_lvb(0, lockres); |
1934 | ||
1935 | mlog_exit_void(); | |
1936 | } | |
1937 | ||
1938 | static void ocfs2_unpack_timespec(struct timespec *spec, | |
1939 | u64 packed_time) | |
1940 | { | |
1941 | spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT; | |
1942 | spec->tv_nsec = packed_time & OCFS2_NSEC_MASK; | |
1943 | } | |
1944 | ||
1945 | static void ocfs2_refresh_inode_from_lvb(struct inode *inode) | |
1946 | { | |
1947 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
e63aecb6 | 1948 | struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
ccd979bd MF |
1949 | struct ocfs2_meta_lvb *lvb; |
1950 | ||
1951 | mlog_entry_void(); | |
1952 | ||
1953 | mlog_meta_lvb(0, lockres); | |
1954 | ||
a641dc2a | 1955 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
ccd979bd MF |
1956 | |
1957 | /* We're safe here without the lockres lock... */ | |
1958 | spin_lock(&oi->ip_lock); | |
1959 | oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters); | |
1960 | i_size_write(inode, be64_to_cpu(lvb->lvb_isize)); | |
1961 | ||
ca4d147e | 1962 | oi->ip_attr = be32_to_cpu(lvb->lvb_iattr); |
15b1e36b | 1963 | oi->ip_dyn_features = be16_to_cpu(lvb->lvb_idynfeatures); |
ca4d147e HP |
1964 | ocfs2_set_inode_flags(inode); |
1965 | ||
ccd979bd MF |
1966 | /* fast-symlinks are a special case */ |
1967 | if (S_ISLNK(inode->i_mode) && !oi->ip_clusters) | |
1968 | inode->i_blocks = 0; | |
1969 | else | |
8110b073 | 1970 | inode->i_blocks = ocfs2_inode_sector_count(inode); |
ccd979bd MF |
1971 | |
1972 | inode->i_uid = be32_to_cpu(lvb->lvb_iuid); | |
1973 | inode->i_gid = be32_to_cpu(lvb->lvb_igid); | |
1974 | inode->i_mode = be16_to_cpu(lvb->lvb_imode); | |
1975 | inode->i_nlink = be16_to_cpu(lvb->lvb_inlink); | |
1976 | ocfs2_unpack_timespec(&inode->i_atime, | |
1977 | be64_to_cpu(lvb->lvb_iatime_packed)); | |
1978 | ocfs2_unpack_timespec(&inode->i_mtime, | |
1979 | be64_to_cpu(lvb->lvb_imtime_packed)); | |
1980 | ocfs2_unpack_timespec(&inode->i_ctime, | |
1981 | be64_to_cpu(lvb->lvb_ictime_packed)); | |
1982 | spin_unlock(&oi->ip_lock); | |
1983 | ||
1984 | mlog_exit_void(); | |
1985 | } | |
1986 | ||
f9e2d82e MF |
1987 | static inline int ocfs2_meta_lvb_is_trustable(struct inode *inode, |
1988 | struct ocfs2_lock_res *lockres) | |
ccd979bd | 1989 | { |
a641dc2a | 1990 | struct ocfs2_meta_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
ccd979bd | 1991 | |
1c520dfb JB |
1992 | if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) |
1993 | && lvb->lvb_version == OCFS2_LVB_VERSION | |
f9e2d82e | 1994 | && be32_to_cpu(lvb->lvb_igeneration) == inode->i_generation) |
ccd979bd MF |
1995 | return 1; |
1996 | return 0; | |
1997 | } | |
1998 | ||
1999 | /* Determine whether a lock resource needs to be refreshed, and | |
2000 | * arbitrate who gets to refresh it. | |
2001 | * | |
2002 | * 0 means no refresh needed. | |
2003 | * | |
2004 | * > 0 means you need to refresh this and you MUST call | |
2005 | * ocfs2_complete_lock_res_refresh afterwards. */ | |
2006 | static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres) | |
2007 | { | |
2008 | unsigned long flags; | |
2009 | int status = 0; | |
2010 | ||
2011 | mlog_entry_void(); | |
2012 | ||
2013 | refresh_check: | |
2014 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2015 | if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) { | |
2016 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2017 | goto bail; | |
2018 | } | |
2019 | ||
2020 | if (lockres->l_flags & OCFS2_LOCK_REFRESHING) { | |
2021 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2022 | ||
2023 | ocfs2_wait_on_refreshing_lock(lockres); | |
2024 | goto refresh_check; | |
2025 | } | |
2026 | ||
2027 | /* Ok, I'll be the one to refresh this lock. */ | |
2028 | lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING); | |
2029 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2030 | ||
2031 | status = 1; | |
2032 | bail: | |
2033 | mlog_exit(status); | |
2034 | return status; | |
2035 | } | |
2036 | ||
2037 | /* If status is non zero, I'll mark it as not being in refresh | |
2038 | * anymroe, but i won't clear the needs refresh flag. */ | |
2039 | static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres, | |
2040 | int status) | |
2041 | { | |
2042 | unsigned long flags; | |
2043 | mlog_entry_void(); | |
2044 | ||
2045 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2046 | lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING); | |
2047 | if (!status) | |
2048 | lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); | |
2049 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2050 | ||
2051 | wake_up(&lockres->l_event); | |
2052 | ||
2053 | mlog_exit_void(); | |
2054 | } | |
2055 | ||
2056 | /* may or may not return a bh if it went to disk. */ | |
e63aecb6 | 2057 | static int ocfs2_inode_lock_update(struct inode *inode, |
ccd979bd MF |
2058 | struct buffer_head **bh) |
2059 | { | |
2060 | int status = 0; | |
2061 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
e63aecb6 | 2062 | struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
ccd979bd | 2063 | struct ocfs2_dinode *fe; |
c271c5c2 | 2064 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
2065 | |
2066 | mlog_entry_void(); | |
2067 | ||
be9e986b MF |
2068 | if (ocfs2_mount_local(osb)) |
2069 | goto bail; | |
2070 | ||
ccd979bd MF |
2071 | spin_lock(&oi->ip_lock); |
2072 | if (oi->ip_flags & OCFS2_INODE_DELETED) { | |
b0697053 | 2073 | mlog(0, "Orphaned inode %llu was deleted while we " |
ccd979bd | 2074 | "were waiting on a lock. ip_flags = 0x%x\n", |
b0697053 | 2075 | (unsigned long long)oi->ip_blkno, oi->ip_flags); |
ccd979bd MF |
2076 | spin_unlock(&oi->ip_lock); |
2077 | status = -ENOENT; | |
2078 | goto bail; | |
2079 | } | |
2080 | spin_unlock(&oi->ip_lock); | |
2081 | ||
be9e986b MF |
2082 | if (!ocfs2_should_refresh_lock_res(lockres)) |
2083 | goto bail; | |
ccd979bd MF |
2084 | |
2085 | /* This will discard any caching information we might have had | |
2086 | * for the inode metadata. */ | |
2087 | ocfs2_metadata_cache_purge(inode); | |
2088 | ||
83418978 MF |
2089 | ocfs2_extent_map_trunc(inode, 0); |
2090 | ||
be9e986b | 2091 | if (ocfs2_meta_lvb_is_trustable(inode, lockres)) { |
b0697053 MF |
2092 | mlog(0, "Trusting LVB on inode %llu\n", |
2093 | (unsigned long long)oi->ip_blkno); | |
ccd979bd MF |
2094 | ocfs2_refresh_inode_from_lvb(inode); |
2095 | } else { | |
2096 | /* Boo, we have to go to disk. */ | |
2097 | /* read bh, cast, ocfs2_refresh_inode */ | |
b657c95c | 2098 | status = ocfs2_read_inode_block(inode, bh); |
ccd979bd MF |
2099 | if (status < 0) { |
2100 | mlog_errno(status); | |
2101 | goto bail_refresh; | |
2102 | } | |
2103 | fe = (struct ocfs2_dinode *) (*bh)->b_data; | |
2104 | ||
2105 | /* This is a good chance to make sure we're not | |
b657c95c JB |
2106 | * locking an invalid object. ocfs2_read_inode_block() |
2107 | * already checked that the inode block is sane. | |
ccd979bd MF |
2108 | * |
2109 | * We bug on a stale inode here because we checked | |
2110 | * above whether it was wiped from disk. The wiping | |
2111 | * node provides a guarantee that we receive that | |
2112 | * message and can mark the inode before dropping any | |
2113 | * locks associated with it. */ | |
ccd979bd MF |
2114 | mlog_bug_on_msg(inode->i_generation != |
2115 | le32_to_cpu(fe->i_generation), | |
b0697053 | 2116 | "Invalid dinode %llu disk generation: %u " |
ccd979bd | 2117 | "inode->i_generation: %u\n", |
b0697053 MF |
2118 | (unsigned long long)oi->ip_blkno, |
2119 | le32_to_cpu(fe->i_generation), | |
ccd979bd MF |
2120 | inode->i_generation); |
2121 | mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) || | |
2122 | !(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)), | |
b0697053 MF |
2123 | "Stale dinode %llu dtime: %llu flags: 0x%x\n", |
2124 | (unsigned long long)oi->ip_blkno, | |
2125 | (unsigned long long)le64_to_cpu(fe->i_dtime), | |
ccd979bd MF |
2126 | le32_to_cpu(fe->i_flags)); |
2127 | ||
2128 | ocfs2_refresh_inode(inode, fe); | |
8ddb7b00 | 2129 | ocfs2_track_lock_refresh(lockres); |
ccd979bd MF |
2130 | } |
2131 | ||
2132 | status = 0; | |
2133 | bail_refresh: | |
be9e986b | 2134 | ocfs2_complete_lock_res_refresh(lockres, status); |
ccd979bd MF |
2135 | bail: |
2136 | mlog_exit(status); | |
2137 | return status; | |
2138 | } | |
2139 | ||
2140 | static int ocfs2_assign_bh(struct inode *inode, | |
2141 | struct buffer_head **ret_bh, | |
2142 | struct buffer_head *passed_bh) | |
2143 | { | |
2144 | int status; | |
2145 | ||
2146 | if (passed_bh) { | |
2147 | /* Ok, the update went to disk for us, use the | |
2148 | * returned bh. */ | |
2149 | *ret_bh = passed_bh; | |
2150 | get_bh(*ret_bh); | |
2151 | ||
2152 | return 0; | |
2153 | } | |
2154 | ||
b657c95c | 2155 | status = ocfs2_read_inode_block(inode, ret_bh); |
ccd979bd MF |
2156 | if (status < 0) |
2157 | mlog_errno(status); | |
2158 | ||
2159 | return status; | |
2160 | } | |
2161 | ||
2162 | /* | |
2163 | * returns < 0 error if the callback will never be called, otherwise | |
2164 | * the result of the lock will be communicated via the callback. | |
2165 | */ | |
e63aecb6 | 2166 | int ocfs2_inode_lock_full(struct inode *inode, |
ccd979bd MF |
2167 | struct buffer_head **ret_bh, |
2168 | int ex, | |
2169 | int arg_flags) | |
2170 | { | |
bd3e7610 JB |
2171 | int status, level, acquired; |
2172 | u32 dlm_flags; | |
c271c5c2 | 2173 | struct ocfs2_lock_res *lockres = NULL; |
ccd979bd MF |
2174 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
2175 | struct buffer_head *local_bh = NULL; | |
2176 | ||
2177 | BUG_ON(!inode); | |
2178 | ||
2179 | mlog_entry_void(); | |
2180 | ||
b0697053 MF |
2181 | mlog(0, "inode %llu, take %s META lock\n", |
2182 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
2183 | ex ? "EXMODE" : "PRMODE"); |
2184 | ||
2185 | status = 0; | |
2186 | acquired = 0; | |
2187 | /* We'll allow faking a readonly metadata lock for | |
2188 | * rodevices. */ | |
2189 | if (ocfs2_is_hard_readonly(osb)) { | |
2190 | if (ex) | |
2191 | status = -EROFS; | |
2192 | goto bail; | |
2193 | } | |
2194 | ||
c271c5c2 SM |
2195 | if (ocfs2_mount_local(osb)) |
2196 | goto local; | |
2197 | ||
ccd979bd | 2198 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) |
553abd04 | 2199 | ocfs2_wait_for_recovery(osb); |
ccd979bd | 2200 | |
e63aecb6 | 2201 | lockres = &OCFS2_I(inode)->ip_inode_lockres; |
bd3e7610 | 2202 | level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd MF |
2203 | dlm_flags = 0; |
2204 | if (arg_flags & OCFS2_META_LOCK_NOQUEUE) | |
bd3e7610 | 2205 | dlm_flags |= DLM_LKF_NOQUEUE; |
ccd979bd MF |
2206 | |
2207 | status = ocfs2_cluster_lock(osb, lockres, level, dlm_flags, arg_flags); | |
2208 | if (status < 0) { | |
2209 | if (status != -EAGAIN && status != -EIOCBRETRY) | |
2210 | mlog_errno(status); | |
2211 | goto bail; | |
2212 | } | |
2213 | ||
2214 | /* Notify the error cleanup path to drop the cluster lock. */ | |
2215 | acquired = 1; | |
2216 | ||
2217 | /* We wait twice because a node may have died while we were in | |
2218 | * the lower dlm layers. The second time though, we've | |
2219 | * committed to owning this lock so we don't allow signals to | |
2220 | * abort the operation. */ | |
2221 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) | |
553abd04 | 2222 | ocfs2_wait_for_recovery(osb); |
ccd979bd | 2223 | |
c271c5c2 | 2224 | local: |
24c19ef4 MF |
2225 | /* |
2226 | * We only see this flag if we're being called from | |
2227 | * ocfs2_read_locked_inode(). It means we're locking an inode | |
2228 | * which hasn't been populated yet, so clear the refresh flag | |
2229 | * and let the caller handle it. | |
2230 | */ | |
2231 | if (inode->i_state & I_NEW) { | |
2232 | status = 0; | |
c271c5c2 SM |
2233 | if (lockres) |
2234 | ocfs2_complete_lock_res_refresh(lockres, 0); | |
24c19ef4 MF |
2235 | goto bail; |
2236 | } | |
2237 | ||
ccd979bd | 2238 | /* This is fun. The caller may want a bh back, or it may |
e63aecb6 | 2239 | * not. ocfs2_inode_lock_update definitely wants one in, but |
ccd979bd MF |
2240 | * may or may not read one, depending on what's in the |
2241 | * LVB. The result of all of this is that we've *only* gone to | |
2242 | * disk if we have to, so the complexity is worthwhile. */ | |
e63aecb6 | 2243 | status = ocfs2_inode_lock_update(inode, &local_bh); |
ccd979bd MF |
2244 | if (status < 0) { |
2245 | if (status != -ENOENT) | |
2246 | mlog_errno(status); | |
2247 | goto bail; | |
2248 | } | |
2249 | ||
2250 | if (ret_bh) { | |
2251 | status = ocfs2_assign_bh(inode, ret_bh, local_bh); | |
2252 | if (status < 0) { | |
2253 | mlog_errno(status); | |
2254 | goto bail; | |
2255 | } | |
2256 | } | |
2257 | ||
ccd979bd MF |
2258 | bail: |
2259 | if (status < 0) { | |
2260 | if (ret_bh && (*ret_bh)) { | |
2261 | brelse(*ret_bh); | |
2262 | *ret_bh = NULL; | |
2263 | } | |
2264 | if (acquired) | |
e63aecb6 | 2265 | ocfs2_inode_unlock(inode, ex); |
ccd979bd MF |
2266 | } |
2267 | ||
2268 | if (local_bh) | |
2269 | brelse(local_bh); | |
2270 | ||
2271 | mlog_exit(status); | |
2272 | return status; | |
2273 | } | |
2274 | ||
2275 | /* | |
34d024f8 MF |
2276 | * This is working around a lock inversion between tasks acquiring DLM |
2277 | * locks while holding a page lock and the downconvert thread which | |
2278 | * blocks dlm lock acquiry while acquiring page locks. | |
ccd979bd MF |
2279 | * |
2280 | * ** These _with_page variantes are only intended to be called from aop | |
2281 | * methods that hold page locks and return a very specific *positive* error | |
2282 | * code that aop methods pass up to the VFS -- test for errors with != 0. ** | |
2283 | * | |
34d024f8 MF |
2284 | * The DLM is called such that it returns -EAGAIN if it would have |
2285 | * blocked waiting for the downconvert thread. In that case we unlock | |
2286 | * our page so the downconvert thread can make progress. Once we've | |
2287 | * done this we have to return AOP_TRUNCATED_PAGE so the aop method | |
2288 | * that called us can bubble that back up into the VFS who will then | |
2289 | * immediately retry the aop call. | |
ccd979bd MF |
2290 | * |
2291 | * We do a blocking lock and immediate unlock before returning, though, so that | |
2292 | * the lock has a great chance of being cached on this node by the time the VFS | |
2293 | * calls back to retry the aop. This has a potential to livelock as nodes | |
2294 | * ping locks back and forth, but that's a risk we're willing to take to avoid | |
2295 | * the lock inversion simply. | |
2296 | */ | |
e63aecb6 | 2297 | int ocfs2_inode_lock_with_page(struct inode *inode, |
ccd979bd MF |
2298 | struct buffer_head **ret_bh, |
2299 | int ex, | |
2300 | struct page *page) | |
2301 | { | |
2302 | int ret; | |
2303 | ||
e63aecb6 | 2304 | ret = ocfs2_inode_lock_full(inode, ret_bh, ex, OCFS2_LOCK_NONBLOCK); |
ccd979bd MF |
2305 | if (ret == -EAGAIN) { |
2306 | unlock_page(page); | |
e63aecb6 MF |
2307 | if (ocfs2_inode_lock(inode, ret_bh, ex) == 0) |
2308 | ocfs2_inode_unlock(inode, ex); | |
ccd979bd MF |
2309 | ret = AOP_TRUNCATED_PAGE; |
2310 | } | |
2311 | ||
2312 | return ret; | |
2313 | } | |
2314 | ||
e63aecb6 | 2315 | int ocfs2_inode_lock_atime(struct inode *inode, |
7f1a37e3 TY |
2316 | struct vfsmount *vfsmnt, |
2317 | int *level) | |
2318 | { | |
2319 | int ret; | |
2320 | ||
2321 | mlog_entry_void(); | |
e63aecb6 | 2322 | ret = ocfs2_inode_lock(inode, NULL, 0); |
7f1a37e3 TY |
2323 | if (ret < 0) { |
2324 | mlog_errno(ret); | |
2325 | return ret; | |
2326 | } | |
2327 | ||
2328 | /* | |
2329 | * If we should update atime, we will get EX lock, | |
2330 | * otherwise we just get PR lock. | |
2331 | */ | |
2332 | if (ocfs2_should_update_atime(inode, vfsmnt)) { | |
2333 | struct buffer_head *bh = NULL; | |
2334 | ||
e63aecb6 MF |
2335 | ocfs2_inode_unlock(inode, 0); |
2336 | ret = ocfs2_inode_lock(inode, &bh, 1); | |
7f1a37e3 TY |
2337 | if (ret < 0) { |
2338 | mlog_errno(ret); | |
2339 | return ret; | |
2340 | } | |
2341 | *level = 1; | |
2342 | if (ocfs2_should_update_atime(inode, vfsmnt)) | |
2343 | ocfs2_update_inode_atime(inode, bh); | |
2344 | if (bh) | |
2345 | brelse(bh); | |
2346 | } else | |
2347 | *level = 0; | |
2348 | ||
2349 | mlog_exit(ret); | |
2350 | return ret; | |
2351 | } | |
2352 | ||
e63aecb6 | 2353 | void ocfs2_inode_unlock(struct inode *inode, |
ccd979bd MF |
2354 | int ex) |
2355 | { | |
bd3e7610 | 2356 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
e63aecb6 | 2357 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_inode_lockres; |
c271c5c2 | 2358 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
2359 | |
2360 | mlog_entry_void(); | |
2361 | ||
b0697053 MF |
2362 | mlog(0, "inode %llu drop %s META lock\n", |
2363 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
2364 | ex ? "EXMODE" : "PRMODE"); |
2365 | ||
c271c5c2 SM |
2366 | if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)) && |
2367 | !ocfs2_mount_local(osb)) | |
ccd979bd MF |
2368 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); |
2369 | ||
2370 | mlog_exit_void(); | |
2371 | } | |
2372 | ||
83273932 SE |
2373 | int ocfs2_orphan_scan_lock(struct ocfs2_super *osb, u32 *seqno, int ex) |
2374 | { | |
2375 | struct ocfs2_lock_res *lockres; | |
2376 | struct ocfs2_orphan_scan_lvb *lvb; | |
2377 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; | |
2378 | int status = 0; | |
2379 | ||
2380 | lockres = &osb->osb_orphan_scan.os_lockres; | |
2381 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); | |
2382 | if (status < 0) | |
2383 | return status; | |
2384 | ||
2385 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
1c520dfb JB |
2386 | if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) && |
2387 | lvb->lvb_version == OCFS2_ORPHAN_LVB_VERSION) | |
83273932 SE |
2388 | *seqno = be32_to_cpu(lvb->lvb_os_seqno); |
2389 | return status; | |
2390 | } | |
2391 | ||
2392 | void ocfs2_orphan_scan_unlock(struct ocfs2_super *osb, u32 seqno, int ex) | |
2393 | { | |
2394 | struct ocfs2_lock_res *lockres; | |
2395 | struct ocfs2_orphan_scan_lvb *lvb; | |
2396 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; | |
2397 | ||
2398 | lockres = &osb->osb_orphan_scan.os_lockres; | |
2399 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
2400 | lvb->lvb_version = OCFS2_ORPHAN_LVB_VERSION; | |
2401 | lvb->lvb_os_seqno = cpu_to_be32(seqno); | |
2402 | ocfs2_cluster_unlock(osb, lockres, level); | |
2403 | } | |
2404 | ||
ccd979bd MF |
2405 | int ocfs2_super_lock(struct ocfs2_super *osb, |
2406 | int ex) | |
2407 | { | |
c271c5c2 | 2408 | int status = 0; |
bd3e7610 | 2409 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd | 2410 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; |
ccd979bd MF |
2411 | |
2412 | mlog_entry_void(); | |
2413 | ||
2414 | if (ocfs2_is_hard_readonly(osb)) | |
2415 | return -EROFS; | |
2416 | ||
c271c5c2 SM |
2417 | if (ocfs2_mount_local(osb)) |
2418 | goto bail; | |
2419 | ||
ccd979bd MF |
2420 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); |
2421 | if (status < 0) { | |
2422 | mlog_errno(status); | |
2423 | goto bail; | |
2424 | } | |
2425 | ||
2426 | /* The super block lock path is really in the best position to | |
2427 | * know when resources covered by the lock need to be | |
2428 | * refreshed, so we do it here. Of course, making sense of | |
2429 | * everything is up to the caller :) */ | |
2430 | status = ocfs2_should_refresh_lock_res(lockres); | |
2431 | if (status < 0) { | |
2432 | mlog_errno(status); | |
2433 | goto bail; | |
2434 | } | |
2435 | if (status) { | |
8e8a4603 | 2436 | status = ocfs2_refresh_slot_info(osb); |
ccd979bd MF |
2437 | |
2438 | ocfs2_complete_lock_res_refresh(lockres, status); | |
2439 | ||
2440 | if (status < 0) | |
2441 | mlog_errno(status); | |
8ddb7b00 | 2442 | ocfs2_track_lock_refresh(lockres); |
ccd979bd MF |
2443 | } |
2444 | bail: | |
2445 | mlog_exit(status); | |
2446 | return status; | |
2447 | } | |
2448 | ||
2449 | void ocfs2_super_unlock(struct ocfs2_super *osb, | |
2450 | int ex) | |
2451 | { | |
bd3e7610 | 2452 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd MF |
2453 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; |
2454 | ||
c271c5c2 SM |
2455 | if (!ocfs2_mount_local(osb)) |
2456 | ocfs2_cluster_unlock(osb, lockres, level); | |
ccd979bd MF |
2457 | } |
2458 | ||
2459 | int ocfs2_rename_lock(struct ocfs2_super *osb) | |
2460 | { | |
2461 | int status; | |
2462 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; | |
2463 | ||
2464 | if (ocfs2_is_hard_readonly(osb)) | |
2465 | return -EROFS; | |
2466 | ||
c271c5c2 SM |
2467 | if (ocfs2_mount_local(osb)) |
2468 | return 0; | |
2469 | ||
bd3e7610 | 2470 | status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX, 0, 0); |
ccd979bd MF |
2471 | if (status < 0) |
2472 | mlog_errno(status); | |
2473 | ||
2474 | return status; | |
2475 | } | |
2476 | ||
2477 | void ocfs2_rename_unlock(struct ocfs2_super *osb) | |
2478 | { | |
2479 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; | |
2480 | ||
c271c5c2 | 2481 | if (!ocfs2_mount_local(osb)) |
bd3e7610 | 2482 | ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX); |
ccd979bd MF |
2483 | } |
2484 | ||
6ca497a8 | 2485 | int ocfs2_nfs_sync_lock(struct ocfs2_super *osb, int ex) |
2486 | { | |
2487 | int status; | |
2488 | struct ocfs2_lock_res *lockres = &osb->osb_nfs_sync_lockres; | |
2489 | ||
2490 | if (ocfs2_is_hard_readonly(osb)) | |
2491 | return -EROFS; | |
2492 | ||
2493 | if (ocfs2_mount_local(osb)) | |
2494 | return 0; | |
2495 | ||
2496 | status = ocfs2_cluster_lock(osb, lockres, ex ? LKM_EXMODE : LKM_PRMODE, | |
2497 | 0, 0); | |
2498 | if (status < 0) | |
2499 | mlog(ML_ERROR, "lock on nfs sync lock failed %d\n", status); | |
2500 | ||
2501 | return status; | |
2502 | } | |
2503 | ||
2504 | void ocfs2_nfs_sync_unlock(struct ocfs2_super *osb, int ex) | |
2505 | { | |
2506 | struct ocfs2_lock_res *lockres = &osb->osb_nfs_sync_lockres; | |
2507 | ||
2508 | if (!ocfs2_mount_local(osb)) | |
2509 | ocfs2_cluster_unlock(osb, lockres, | |
2510 | ex ? LKM_EXMODE : LKM_PRMODE); | |
2511 | } | |
2512 | ||
d680efe9 MF |
2513 | int ocfs2_dentry_lock(struct dentry *dentry, int ex) |
2514 | { | |
2515 | int ret; | |
bd3e7610 | 2516 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
d680efe9 MF |
2517 | struct ocfs2_dentry_lock *dl = dentry->d_fsdata; |
2518 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); | |
2519 | ||
2520 | BUG_ON(!dl); | |
2521 | ||
2522 | if (ocfs2_is_hard_readonly(osb)) | |
2523 | return -EROFS; | |
2524 | ||
c271c5c2 SM |
2525 | if (ocfs2_mount_local(osb)) |
2526 | return 0; | |
2527 | ||
d680efe9 MF |
2528 | ret = ocfs2_cluster_lock(osb, &dl->dl_lockres, level, 0, 0); |
2529 | if (ret < 0) | |
2530 | mlog_errno(ret); | |
2531 | ||
2532 | return ret; | |
2533 | } | |
2534 | ||
2535 | void ocfs2_dentry_unlock(struct dentry *dentry, int ex) | |
2536 | { | |
bd3e7610 | 2537 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
d680efe9 MF |
2538 | struct ocfs2_dentry_lock *dl = dentry->d_fsdata; |
2539 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); | |
2540 | ||
c271c5c2 SM |
2541 | if (!ocfs2_mount_local(osb)) |
2542 | ocfs2_cluster_unlock(osb, &dl->dl_lockres, level); | |
d680efe9 MF |
2543 | } |
2544 | ||
ccd979bd MF |
2545 | /* Reference counting of the dlm debug structure. We want this because |
2546 | * open references on the debug inodes can live on after a mount, so | |
2547 | * we can't rely on the ocfs2_super to always exist. */ | |
2548 | static void ocfs2_dlm_debug_free(struct kref *kref) | |
2549 | { | |
2550 | struct ocfs2_dlm_debug *dlm_debug; | |
2551 | ||
2552 | dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt); | |
2553 | ||
2554 | kfree(dlm_debug); | |
2555 | } | |
2556 | ||
2557 | void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug) | |
2558 | { | |
2559 | if (dlm_debug) | |
2560 | kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free); | |
2561 | } | |
2562 | ||
2563 | static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug) | |
2564 | { | |
2565 | kref_get(&debug->d_refcnt); | |
2566 | } | |
2567 | ||
2568 | struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void) | |
2569 | { | |
2570 | struct ocfs2_dlm_debug *dlm_debug; | |
2571 | ||
2572 | dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL); | |
2573 | if (!dlm_debug) { | |
2574 | mlog_errno(-ENOMEM); | |
2575 | goto out; | |
2576 | } | |
2577 | ||
2578 | kref_init(&dlm_debug->d_refcnt); | |
2579 | INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking); | |
2580 | dlm_debug->d_locking_state = NULL; | |
2581 | out: | |
2582 | return dlm_debug; | |
2583 | } | |
2584 | ||
2585 | /* Access to this is arbitrated for us via seq_file->sem. */ | |
2586 | struct ocfs2_dlm_seq_priv { | |
2587 | struct ocfs2_dlm_debug *p_dlm_debug; | |
2588 | struct ocfs2_lock_res p_iter_res; | |
2589 | struct ocfs2_lock_res p_tmp_res; | |
2590 | }; | |
2591 | ||
2592 | static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start, | |
2593 | struct ocfs2_dlm_seq_priv *priv) | |
2594 | { | |
2595 | struct ocfs2_lock_res *iter, *ret = NULL; | |
2596 | struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug; | |
2597 | ||
2598 | assert_spin_locked(&ocfs2_dlm_tracking_lock); | |
2599 | ||
2600 | list_for_each_entry(iter, &start->l_debug_list, l_debug_list) { | |
2601 | /* discover the head of the list */ | |
2602 | if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) { | |
2603 | mlog(0, "End of list found, %p\n", ret); | |
2604 | break; | |
2605 | } | |
2606 | ||
2607 | /* We track our "dummy" iteration lockres' by a NULL | |
2608 | * l_ops field. */ | |
2609 | if (iter->l_ops != NULL) { | |
2610 | ret = iter; | |
2611 | break; | |
2612 | } | |
2613 | } | |
2614 | ||
2615 | return ret; | |
2616 | } | |
2617 | ||
2618 | static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos) | |
2619 | { | |
2620 | struct ocfs2_dlm_seq_priv *priv = m->private; | |
2621 | struct ocfs2_lock_res *iter; | |
2622 | ||
2623 | spin_lock(&ocfs2_dlm_tracking_lock); | |
2624 | iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv); | |
2625 | if (iter) { | |
2626 | /* Since lockres' have the lifetime of their container | |
2627 | * (which can be inodes, ocfs2_supers, etc) we want to | |
2628 | * copy this out to a temporary lockres while still | |
2629 | * under the spinlock. Obviously after this we can't | |
2630 | * trust any pointers on the copy returned, but that's | |
2631 | * ok as the information we want isn't typically held | |
2632 | * in them. */ | |
2633 | priv->p_tmp_res = *iter; | |
2634 | iter = &priv->p_tmp_res; | |
2635 | } | |
2636 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
2637 | ||
2638 | return iter; | |
2639 | } | |
2640 | ||
2641 | static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v) | |
2642 | { | |
2643 | } | |
2644 | ||
2645 | static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
2646 | { | |
2647 | struct ocfs2_dlm_seq_priv *priv = m->private; | |
2648 | struct ocfs2_lock_res *iter = v; | |
2649 | struct ocfs2_lock_res *dummy = &priv->p_iter_res; | |
2650 | ||
2651 | spin_lock(&ocfs2_dlm_tracking_lock); | |
2652 | iter = ocfs2_dlm_next_res(iter, priv); | |
2653 | list_del_init(&dummy->l_debug_list); | |
2654 | if (iter) { | |
2655 | list_add(&dummy->l_debug_list, &iter->l_debug_list); | |
2656 | priv->p_tmp_res = *iter; | |
2657 | iter = &priv->p_tmp_res; | |
2658 | } | |
2659 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
2660 | ||
2661 | return iter; | |
2662 | } | |
2663 | ||
2664 | /* So that debugfs.ocfs2 can determine which format is being used */ | |
8ddb7b00 | 2665 | #define OCFS2_DLM_DEBUG_STR_VERSION 2 |
ccd979bd MF |
2666 | static int ocfs2_dlm_seq_show(struct seq_file *m, void *v) |
2667 | { | |
2668 | int i; | |
2669 | char *lvb; | |
2670 | struct ocfs2_lock_res *lockres = v; | |
2671 | ||
2672 | if (!lockres) | |
2673 | return -EINVAL; | |
2674 | ||
d680efe9 MF |
2675 | seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION); |
2676 | ||
2677 | if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY) | |
2678 | seq_printf(m, "%.*s%08x\t", OCFS2_DENTRY_LOCK_INO_START - 1, | |
2679 | lockres->l_name, | |
2680 | (unsigned int)ocfs2_get_dentry_lock_ino(lockres)); | |
2681 | else | |
2682 | seq_printf(m, "%.*s\t", OCFS2_LOCK_ID_MAX_LEN, lockres->l_name); | |
2683 | ||
2684 | seq_printf(m, "%d\t" | |
ccd979bd MF |
2685 | "0x%lx\t" |
2686 | "0x%x\t" | |
2687 | "0x%x\t" | |
2688 | "%u\t" | |
2689 | "%u\t" | |
2690 | "%d\t" | |
2691 | "%d\t", | |
ccd979bd MF |
2692 | lockres->l_level, |
2693 | lockres->l_flags, | |
2694 | lockres->l_action, | |
2695 | lockres->l_unlock_action, | |
2696 | lockres->l_ro_holders, | |
2697 | lockres->l_ex_holders, | |
2698 | lockres->l_requested, | |
2699 | lockres->l_blocking); | |
2700 | ||
2701 | /* Dump the raw LVB */ | |
8f2c9c1b | 2702 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
ccd979bd MF |
2703 | for(i = 0; i < DLM_LVB_LEN; i++) |
2704 | seq_printf(m, "0x%x\t", lvb[i]); | |
2705 | ||
8ddb7b00 SM |
2706 | #ifdef CONFIG_OCFS2_FS_STATS |
2707 | # define lock_num_prmode(_l) (_l)->l_lock_num_prmode | |
2708 | # define lock_num_exmode(_l) (_l)->l_lock_num_exmode | |
2709 | # define lock_num_prmode_failed(_l) (_l)->l_lock_num_prmode_failed | |
2710 | # define lock_num_exmode_failed(_l) (_l)->l_lock_num_exmode_failed | |
2711 | # define lock_total_prmode(_l) (_l)->l_lock_total_prmode | |
2712 | # define lock_total_exmode(_l) (_l)->l_lock_total_exmode | |
2713 | # define lock_max_prmode(_l) (_l)->l_lock_max_prmode | |
2714 | # define lock_max_exmode(_l) (_l)->l_lock_max_exmode | |
2715 | # define lock_refresh(_l) (_l)->l_lock_refresh | |
2716 | #else | |
dd25e55e RD |
2717 | # define lock_num_prmode(_l) (0ULL) |
2718 | # define lock_num_exmode(_l) (0ULL) | |
8ddb7b00 SM |
2719 | # define lock_num_prmode_failed(_l) (0) |
2720 | # define lock_num_exmode_failed(_l) (0) | |
dd25e55e RD |
2721 | # define lock_total_prmode(_l) (0ULL) |
2722 | # define lock_total_exmode(_l) (0ULL) | |
8ddb7b00 SM |
2723 | # define lock_max_prmode(_l) (0) |
2724 | # define lock_max_exmode(_l) (0) | |
2725 | # define lock_refresh(_l) (0) | |
2726 | #endif | |
2727 | /* The following seq_print was added in version 2 of this output */ | |
2728 | seq_printf(m, "%llu\t" | |
2729 | "%llu\t" | |
2730 | "%u\t" | |
2731 | "%u\t" | |
2732 | "%llu\t" | |
2733 | "%llu\t" | |
2734 | "%u\t" | |
2735 | "%u\t" | |
2736 | "%u\t", | |
2737 | lock_num_prmode(lockres), | |
2738 | lock_num_exmode(lockres), | |
2739 | lock_num_prmode_failed(lockres), | |
2740 | lock_num_exmode_failed(lockres), | |
2741 | lock_total_prmode(lockres), | |
2742 | lock_total_exmode(lockres), | |
2743 | lock_max_prmode(lockres), | |
2744 | lock_max_exmode(lockres), | |
2745 | lock_refresh(lockres)); | |
2746 | ||
ccd979bd MF |
2747 | /* End the line */ |
2748 | seq_printf(m, "\n"); | |
2749 | return 0; | |
2750 | } | |
2751 | ||
90d99779 | 2752 | static const struct seq_operations ocfs2_dlm_seq_ops = { |
ccd979bd MF |
2753 | .start = ocfs2_dlm_seq_start, |
2754 | .stop = ocfs2_dlm_seq_stop, | |
2755 | .next = ocfs2_dlm_seq_next, | |
2756 | .show = ocfs2_dlm_seq_show, | |
2757 | }; | |
2758 | ||
2759 | static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file) | |
2760 | { | |
2761 | struct seq_file *seq = (struct seq_file *) file->private_data; | |
2762 | struct ocfs2_dlm_seq_priv *priv = seq->private; | |
2763 | struct ocfs2_lock_res *res = &priv->p_iter_res; | |
2764 | ||
2765 | ocfs2_remove_lockres_tracking(res); | |
2766 | ocfs2_put_dlm_debug(priv->p_dlm_debug); | |
2767 | return seq_release_private(inode, file); | |
2768 | } | |
2769 | ||
2770 | static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file) | |
2771 | { | |
2772 | int ret; | |
2773 | struct ocfs2_dlm_seq_priv *priv; | |
2774 | struct seq_file *seq; | |
2775 | struct ocfs2_super *osb; | |
2776 | ||
2777 | priv = kzalloc(sizeof(struct ocfs2_dlm_seq_priv), GFP_KERNEL); | |
2778 | if (!priv) { | |
2779 | ret = -ENOMEM; | |
2780 | mlog_errno(ret); | |
2781 | goto out; | |
2782 | } | |
8e18e294 | 2783 | osb = inode->i_private; |
ccd979bd MF |
2784 | ocfs2_get_dlm_debug(osb->osb_dlm_debug); |
2785 | priv->p_dlm_debug = osb->osb_dlm_debug; | |
2786 | INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list); | |
2787 | ||
2788 | ret = seq_open(file, &ocfs2_dlm_seq_ops); | |
2789 | if (ret) { | |
2790 | kfree(priv); | |
2791 | mlog_errno(ret); | |
2792 | goto out; | |
2793 | } | |
2794 | ||
2795 | seq = (struct seq_file *) file->private_data; | |
2796 | seq->private = priv; | |
2797 | ||
2798 | ocfs2_add_lockres_tracking(&priv->p_iter_res, | |
2799 | priv->p_dlm_debug); | |
2800 | ||
2801 | out: | |
2802 | return ret; | |
2803 | } | |
2804 | ||
4b6f5d20 | 2805 | static const struct file_operations ocfs2_dlm_debug_fops = { |
ccd979bd MF |
2806 | .open = ocfs2_dlm_debug_open, |
2807 | .release = ocfs2_dlm_debug_release, | |
2808 | .read = seq_read, | |
2809 | .llseek = seq_lseek, | |
2810 | }; | |
2811 | ||
2812 | static int ocfs2_dlm_init_debug(struct ocfs2_super *osb) | |
2813 | { | |
2814 | int ret = 0; | |
2815 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; | |
2816 | ||
2817 | dlm_debug->d_locking_state = debugfs_create_file("locking_state", | |
2818 | S_IFREG|S_IRUSR, | |
2819 | osb->osb_debug_root, | |
2820 | osb, | |
2821 | &ocfs2_dlm_debug_fops); | |
2822 | if (!dlm_debug->d_locking_state) { | |
2823 | ret = -EINVAL; | |
2824 | mlog(ML_ERROR, | |
2825 | "Unable to create locking state debugfs file.\n"); | |
2826 | goto out; | |
2827 | } | |
2828 | ||
2829 | ocfs2_get_dlm_debug(dlm_debug); | |
2830 | out: | |
2831 | return ret; | |
2832 | } | |
2833 | ||
2834 | static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb) | |
2835 | { | |
2836 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; | |
2837 | ||
2838 | if (dlm_debug) { | |
2839 | debugfs_remove(dlm_debug->d_locking_state); | |
2840 | ocfs2_put_dlm_debug(dlm_debug); | |
2841 | } | |
2842 | } | |
2843 | ||
2844 | int ocfs2_dlm_init(struct ocfs2_super *osb) | |
2845 | { | |
c271c5c2 | 2846 | int status = 0; |
4670c46d | 2847 | struct ocfs2_cluster_connection *conn = NULL; |
ccd979bd MF |
2848 | |
2849 | mlog_entry_void(); | |
2850 | ||
0abd6d18 MF |
2851 | if (ocfs2_mount_local(osb)) { |
2852 | osb->node_num = 0; | |
c271c5c2 | 2853 | goto local; |
0abd6d18 | 2854 | } |
c271c5c2 | 2855 | |
ccd979bd MF |
2856 | status = ocfs2_dlm_init_debug(osb); |
2857 | if (status < 0) { | |
2858 | mlog_errno(status); | |
2859 | goto bail; | |
2860 | } | |
2861 | ||
34d024f8 MF |
2862 | /* launch downconvert thread */ |
2863 | osb->dc_task = kthread_run(ocfs2_downconvert_thread, osb, "ocfs2dc"); | |
2864 | if (IS_ERR(osb->dc_task)) { | |
2865 | status = PTR_ERR(osb->dc_task); | |
2866 | osb->dc_task = NULL; | |
ccd979bd MF |
2867 | mlog_errno(status); |
2868 | goto bail; | |
2869 | } | |
2870 | ||
ccd979bd | 2871 | /* for now, uuid == domain */ |
9c6c877c JB |
2872 | status = ocfs2_cluster_connect(osb->osb_cluster_stack, |
2873 | osb->uuid_str, | |
4670c46d JB |
2874 | strlen(osb->uuid_str), |
2875 | ocfs2_do_node_down, osb, | |
2876 | &conn); | |
2877 | if (status) { | |
ccd979bd MF |
2878 | mlog_errno(status); |
2879 | goto bail; | |
2880 | } | |
2881 | ||
0abd6d18 MF |
2882 | status = ocfs2_cluster_this_node(&osb->node_num); |
2883 | if (status < 0) { | |
2884 | mlog_errno(status); | |
2885 | mlog(ML_ERROR, | |
2886 | "could not find this host's node number\n"); | |
286eaa95 | 2887 | ocfs2_cluster_disconnect(conn, 0); |
0abd6d18 MF |
2888 | goto bail; |
2889 | } | |
2890 | ||
c271c5c2 | 2891 | local: |
ccd979bd MF |
2892 | ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb); |
2893 | ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb); | |
6ca497a8 | 2894 | ocfs2_nfs_sync_lock_res_init(&osb->osb_nfs_sync_lockres, osb); |
83273932 | 2895 | ocfs2_orphan_scan_lock_res_init(&osb->osb_orphan_scan.os_lockres, osb); |
ccd979bd | 2896 | |
4670c46d | 2897 | osb->cconn = conn; |
ccd979bd MF |
2898 | |
2899 | status = 0; | |
2900 | bail: | |
2901 | if (status < 0) { | |
2902 | ocfs2_dlm_shutdown_debug(osb); | |
34d024f8 MF |
2903 | if (osb->dc_task) |
2904 | kthread_stop(osb->dc_task); | |
ccd979bd MF |
2905 | } |
2906 | ||
2907 | mlog_exit(status); | |
2908 | return status; | |
2909 | } | |
2910 | ||
286eaa95 JB |
2911 | void ocfs2_dlm_shutdown(struct ocfs2_super *osb, |
2912 | int hangup_pending) | |
ccd979bd MF |
2913 | { |
2914 | mlog_entry_void(); | |
2915 | ||
ccd979bd MF |
2916 | ocfs2_drop_osb_locks(osb); |
2917 | ||
4670c46d JB |
2918 | /* |
2919 | * Now that we have dropped all locks and ocfs2_dismount_volume() | |
2920 | * has disabled recovery, the DLM won't be talking to us. It's | |
2921 | * safe to tear things down before disconnecting the cluster. | |
2922 | */ | |
2923 | ||
34d024f8 MF |
2924 | if (osb->dc_task) { |
2925 | kthread_stop(osb->dc_task); | |
2926 | osb->dc_task = NULL; | |
ccd979bd MF |
2927 | } |
2928 | ||
2929 | ocfs2_lock_res_free(&osb->osb_super_lockres); | |
2930 | ocfs2_lock_res_free(&osb->osb_rename_lockres); | |
6ca497a8 | 2931 | ocfs2_lock_res_free(&osb->osb_nfs_sync_lockres); |
83273932 | 2932 | ocfs2_lock_res_free(&osb->osb_orphan_scan.os_lockres); |
ccd979bd | 2933 | |
286eaa95 | 2934 | ocfs2_cluster_disconnect(osb->cconn, hangup_pending); |
4670c46d | 2935 | osb->cconn = NULL; |
ccd979bd MF |
2936 | |
2937 | ocfs2_dlm_shutdown_debug(osb); | |
2938 | ||
2939 | mlog_exit_void(); | |
2940 | } | |
2941 | ||
7431cd7e | 2942 | static void ocfs2_unlock_ast(void *opaque, int error) |
ccd979bd MF |
2943 | { |
2944 | struct ocfs2_lock_res *lockres = opaque; | |
2945 | unsigned long flags; | |
2946 | ||
2947 | mlog_entry_void(); | |
2948 | ||
2949 | mlog(0, "UNLOCK AST called on lock %s, action = %d\n", lockres->l_name, | |
2950 | lockres->l_unlock_action); | |
2951 | ||
2952 | spin_lock_irqsave(&lockres->l_lock, flags); | |
de551246 | 2953 | if (error) { |
7431cd7e JB |
2954 | mlog(ML_ERROR, "Dlm passes error %d for lock %s, " |
2955 | "unlock_action %d\n", error, lockres->l_name, | |
ccd979bd MF |
2956 | lockres->l_unlock_action); |
2957 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2958 | return; | |
2959 | } | |
2960 | ||
2961 | switch(lockres->l_unlock_action) { | |
2962 | case OCFS2_UNLOCK_CANCEL_CONVERT: | |
2963 | mlog(0, "Cancel convert success for %s\n", lockres->l_name); | |
2964 | lockres->l_action = OCFS2_AST_INVALID; | |
a4b91965 SM |
2965 | /* Downconvert thread may have requeued this lock, we |
2966 | * need to wake it. */ | |
2967 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) | |
2968 | ocfs2_wake_downconvert_thread(ocfs2_get_lockres_osb(lockres)); | |
ccd979bd MF |
2969 | break; |
2970 | case OCFS2_UNLOCK_DROP_LOCK: | |
bd3e7610 | 2971 | lockres->l_level = DLM_LOCK_IV; |
ccd979bd MF |
2972 | break; |
2973 | default: | |
2974 | BUG(); | |
2975 | } | |
2976 | ||
2977 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
ccd979bd | 2978 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; |
ccd979bd | 2979 | wake_up(&lockres->l_event); |
07f9eebc | 2980 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
ccd979bd MF |
2981 | |
2982 | mlog_exit_void(); | |
2983 | } | |
2984 | ||
ccd979bd | 2985 | static int ocfs2_drop_lock(struct ocfs2_super *osb, |
0d5dc6c2 | 2986 | struct ocfs2_lock_res *lockres) |
ccd979bd | 2987 | { |
7431cd7e | 2988 | int ret; |
ccd979bd | 2989 | unsigned long flags; |
bd3e7610 | 2990 | u32 lkm_flags = 0; |
ccd979bd MF |
2991 | |
2992 | /* We didn't get anywhere near actually using this lockres. */ | |
2993 | if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) | |
2994 | goto out; | |
2995 | ||
b80fc012 | 2996 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
bd3e7610 | 2997 | lkm_flags |= DLM_LKF_VALBLK; |
b80fc012 | 2998 | |
ccd979bd MF |
2999 | spin_lock_irqsave(&lockres->l_lock, flags); |
3000 | ||
3001 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING), | |
3002 | "lockres %s, flags 0x%lx\n", | |
3003 | lockres->l_name, lockres->l_flags); | |
3004 | ||
3005 | while (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
3006 | mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = " | |
3007 | "%u, unlock_action = %u\n", | |
3008 | lockres->l_name, lockres->l_flags, lockres->l_action, | |
3009 | lockres->l_unlock_action); | |
3010 | ||
3011 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3012 | ||
3013 | /* XXX: Today we just wait on any busy | |
3014 | * locks... Perhaps we need to cancel converts in the | |
3015 | * future? */ | |
3016 | ocfs2_wait_on_busy_lock(lockres); | |
3017 | ||
3018 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3019 | } | |
3020 | ||
0d5dc6c2 MF |
3021 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) { |
3022 | if (lockres->l_flags & OCFS2_LOCK_ATTACHED && | |
bd3e7610 | 3023 | lockres->l_level == DLM_LOCK_EX && |
0d5dc6c2 MF |
3024 | !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) |
3025 | lockres->l_ops->set_lvb(lockres); | |
3026 | } | |
ccd979bd MF |
3027 | |
3028 | if (lockres->l_flags & OCFS2_LOCK_BUSY) | |
3029 | mlog(ML_ERROR, "destroying busy lock: \"%s\"\n", | |
3030 | lockres->l_name); | |
3031 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) | |
3032 | mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name); | |
3033 | ||
3034 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { | |
3035 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3036 | goto out; | |
3037 | } | |
3038 | ||
3039 | lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED); | |
3040 | ||
3041 | /* make sure we never get here while waiting for an ast to | |
3042 | * fire. */ | |
3043 | BUG_ON(lockres->l_action != OCFS2_AST_INVALID); | |
3044 | ||
3045 | /* is this necessary? */ | |
3046 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
3047 | lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK; | |
3048 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3049 | ||
3050 | mlog(0, "lock %s\n", lockres->l_name); | |
3051 | ||
4670c46d | 3052 | ret = ocfs2_dlm_unlock(osb->cconn, &lockres->l_lksb, lkm_flags, |
7431cd7e JB |
3053 | lockres); |
3054 | if (ret) { | |
3055 | ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres); | |
ccd979bd | 3056 | mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags); |
cf0acdcd | 3057 | ocfs2_dlm_dump_lksb(&lockres->l_lksb); |
ccd979bd MF |
3058 | BUG(); |
3059 | } | |
73ac36ea | 3060 | mlog(0, "lock %s, successful return from ocfs2_dlm_unlock\n", |
ccd979bd MF |
3061 | lockres->l_name); |
3062 | ||
3063 | ocfs2_wait_on_busy_lock(lockres); | |
3064 | out: | |
3065 | mlog_exit(0); | |
3066 | return 0; | |
3067 | } | |
3068 | ||
3069 | /* Mark the lockres as being dropped. It will no longer be | |
3070 | * queued if blocking, but we still may have to wait on it | |
34d024f8 | 3071 | * being dequeued from the downconvert thread before we can consider |
ccd979bd MF |
3072 | * it safe to drop. |
3073 | * | |
3074 | * You can *not* attempt to call cluster_lock on this lockres anymore. */ | |
3075 | void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres) | |
3076 | { | |
3077 | int status; | |
3078 | struct ocfs2_mask_waiter mw; | |
3079 | unsigned long flags; | |
3080 | ||
3081 | ocfs2_init_mask_waiter(&mw); | |
3082 | ||
3083 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3084 | lockres->l_flags |= OCFS2_LOCK_FREEING; | |
3085 | while (lockres->l_flags & OCFS2_LOCK_QUEUED) { | |
3086 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0); | |
3087 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3088 | ||
3089 | mlog(0, "Waiting on lockres %s\n", lockres->l_name); | |
3090 | ||
3091 | status = ocfs2_wait_for_mask(&mw); | |
3092 | if (status) | |
3093 | mlog_errno(status); | |
3094 | ||
3095 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3096 | } | |
3097 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3098 | } | |
3099 | ||
d680efe9 MF |
3100 | void ocfs2_simple_drop_lockres(struct ocfs2_super *osb, |
3101 | struct ocfs2_lock_res *lockres) | |
ccd979bd | 3102 | { |
d680efe9 | 3103 | int ret; |
ccd979bd | 3104 | |
d680efe9 | 3105 | ocfs2_mark_lockres_freeing(lockres); |
0d5dc6c2 | 3106 | ret = ocfs2_drop_lock(osb, lockres); |
d680efe9 MF |
3107 | if (ret) |
3108 | mlog_errno(ret); | |
3109 | } | |
ccd979bd | 3110 | |
d680efe9 MF |
3111 | static void ocfs2_drop_osb_locks(struct ocfs2_super *osb) |
3112 | { | |
3113 | ocfs2_simple_drop_lockres(osb, &osb->osb_super_lockres); | |
3114 | ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres); | |
6ca497a8 | 3115 | ocfs2_simple_drop_lockres(osb, &osb->osb_nfs_sync_lockres); |
83273932 | 3116 | ocfs2_simple_drop_lockres(osb, &osb->osb_orphan_scan.os_lockres); |
ccd979bd MF |
3117 | } |
3118 | ||
ccd979bd MF |
3119 | int ocfs2_drop_inode_locks(struct inode *inode) |
3120 | { | |
3121 | int status, err; | |
ccd979bd MF |
3122 | |
3123 | mlog_entry_void(); | |
3124 | ||
3125 | /* No need to call ocfs2_mark_lockres_freeing here - | |
3126 | * ocfs2_clear_inode has done it for us. */ | |
3127 | ||
3128 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
50008630 | 3129 | &OCFS2_I(inode)->ip_open_lockres); |
ccd979bd MF |
3130 | if (err < 0) |
3131 | mlog_errno(err); | |
3132 | ||
3133 | status = err; | |
3134 | ||
3135 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
e63aecb6 | 3136 | &OCFS2_I(inode)->ip_inode_lockres); |
ccd979bd MF |
3137 | if (err < 0) |
3138 | mlog_errno(err); | |
3139 | if (err < 0 && !status) | |
3140 | status = err; | |
3141 | ||
3142 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
0d5dc6c2 | 3143 | &OCFS2_I(inode)->ip_rw_lockres); |
ccd979bd MF |
3144 | if (err < 0) |
3145 | mlog_errno(err); | |
3146 | if (err < 0 && !status) | |
3147 | status = err; | |
3148 | ||
3149 | mlog_exit(status); | |
3150 | return status; | |
3151 | } | |
3152 | ||
de551246 JB |
3153 | static unsigned int ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres, |
3154 | int new_level) | |
ccd979bd MF |
3155 | { |
3156 | assert_spin_locked(&lockres->l_lock); | |
3157 | ||
bd3e7610 | 3158 | BUG_ON(lockres->l_blocking <= DLM_LOCK_NL); |
ccd979bd MF |
3159 | |
3160 | if (lockres->l_level <= new_level) { | |
bd3e7610 | 3161 | mlog(ML_ERROR, "lockres->l_level (%d) <= new_level (%d)\n", |
ccd979bd MF |
3162 | lockres->l_level, new_level); |
3163 | BUG(); | |
3164 | } | |
3165 | ||
3166 | mlog(0, "lock %s, new_level = %d, l_blocking = %d\n", | |
3167 | lockres->l_name, new_level, lockres->l_blocking); | |
3168 | ||
3169 | lockres->l_action = OCFS2_AST_DOWNCONVERT; | |
3170 | lockres->l_requested = new_level; | |
3171 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
de551246 | 3172 | return lockres_set_pending(lockres); |
ccd979bd MF |
3173 | } |
3174 | ||
3175 | static int ocfs2_downconvert_lock(struct ocfs2_super *osb, | |
3176 | struct ocfs2_lock_res *lockres, | |
3177 | int new_level, | |
de551246 JB |
3178 | int lvb, |
3179 | unsigned int generation) | |
ccd979bd | 3180 | { |
bd3e7610 JB |
3181 | int ret; |
3182 | u32 dlm_flags = DLM_LKF_CONVERT; | |
ccd979bd MF |
3183 | |
3184 | mlog_entry_void(); | |
3185 | ||
3186 | if (lvb) | |
bd3e7610 | 3187 | dlm_flags |= DLM_LKF_VALBLK; |
ccd979bd | 3188 | |
4670c46d | 3189 | ret = ocfs2_dlm_lock(osb->cconn, |
7431cd7e JB |
3190 | new_level, |
3191 | &lockres->l_lksb, | |
3192 | dlm_flags, | |
3193 | lockres->l_name, | |
3194 | OCFS2_LOCK_ID_MAX_LEN - 1, | |
3195 | lockres); | |
de551246 | 3196 | lockres_clear_pending(lockres, generation, osb); |
7431cd7e JB |
3197 | if (ret) { |
3198 | ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres); | |
ccd979bd MF |
3199 | ocfs2_recover_from_dlm_error(lockres, 1); |
3200 | goto bail; | |
3201 | } | |
3202 | ||
3203 | ret = 0; | |
3204 | bail: | |
3205 | mlog_exit(ret); | |
3206 | return ret; | |
3207 | } | |
3208 | ||
24ef1815 | 3209 | /* returns 1 when the caller should unlock and call ocfs2_dlm_unlock */ |
ccd979bd MF |
3210 | static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb, |
3211 | struct ocfs2_lock_res *lockres) | |
3212 | { | |
3213 | assert_spin_locked(&lockres->l_lock); | |
3214 | ||
3215 | mlog_entry_void(); | |
3216 | mlog(0, "lock %s\n", lockres->l_name); | |
3217 | ||
3218 | if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { | |
3219 | /* If we're already trying to cancel a lock conversion | |
3220 | * then just drop the spinlock and allow the caller to | |
3221 | * requeue this lock. */ | |
3222 | ||
3223 | mlog(0, "Lockres %s, skip convert\n", lockres->l_name); | |
3224 | return 0; | |
3225 | } | |
3226 | ||
3227 | /* were we in a convert when we got the bast fire? */ | |
3228 | BUG_ON(lockres->l_action != OCFS2_AST_CONVERT && | |
3229 | lockres->l_action != OCFS2_AST_DOWNCONVERT); | |
3230 | /* set things up for the unlockast to know to just | |
3231 | * clear out the ast_action and unset busy, etc. */ | |
3232 | lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT; | |
3233 | ||
3234 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY), | |
3235 | "lock %s, invalid flags: 0x%lx\n", | |
3236 | lockres->l_name, lockres->l_flags); | |
3237 | ||
3238 | return 1; | |
3239 | } | |
3240 | ||
3241 | static int ocfs2_cancel_convert(struct ocfs2_super *osb, | |
3242 | struct ocfs2_lock_res *lockres) | |
3243 | { | |
3244 | int ret; | |
ccd979bd MF |
3245 | |
3246 | mlog_entry_void(); | |
3247 | mlog(0, "lock %s\n", lockres->l_name); | |
3248 | ||
4670c46d | 3249 | ret = ocfs2_dlm_unlock(osb->cconn, &lockres->l_lksb, |
7431cd7e JB |
3250 | DLM_LKF_CANCEL, lockres); |
3251 | if (ret) { | |
3252 | ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres); | |
ccd979bd MF |
3253 | ocfs2_recover_from_dlm_error(lockres, 0); |
3254 | } | |
3255 | ||
24ef1815 | 3256 | mlog(0, "lock %s return from ocfs2_dlm_unlock\n", lockres->l_name); |
ccd979bd | 3257 | |
ccd979bd MF |
3258 | mlog_exit(ret); |
3259 | return ret; | |
3260 | } | |
3261 | ||
b5e500e2 MF |
3262 | static int ocfs2_unblock_lock(struct ocfs2_super *osb, |
3263 | struct ocfs2_lock_res *lockres, | |
3264 | struct ocfs2_unblock_ctl *ctl) | |
ccd979bd MF |
3265 | { |
3266 | unsigned long flags; | |
3267 | int blocking; | |
3268 | int new_level; | |
3269 | int ret = 0; | |
5ef0d4ea | 3270 | int set_lvb = 0; |
de551246 | 3271 | unsigned int gen; |
ccd979bd MF |
3272 | |
3273 | mlog_entry_void(); | |
3274 | ||
3275 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3276 | ||
3277 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
3278 | ||
3279 | recheck: | |
3280 | if (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
de551246 JB |
3281 | /* XXX |
3282 | * This is a *big* race. The OCFS2_LOCK_PENDING flag | |
3283 | * exists entirely for one reason - another thread has set | |
3284 | * OCFS2_LOCK_BUSY, but has *NOT* yet called dlm_lock(). | |
3285 | * | |
3286 | * If we do ocfs2_cancel_convert() before the other thread | |
3287 | * calls dlm_lock(), our cancel will do nothing. We will | |
3288 | * get no ast, and we will have no way of knowing the | |
3289 | * cancel failed. Meanwhile, the other thread will call | |
3290 | * into dlm_lock() and wait...forever. | |
3291 | * | |
3292 | * Why forever? Because another node has asked for the | |
3293 | * lock first; that's why we're here in unblock_lock(). | |
3294 | * | |
3295 | * The solution is OCFS2_LOCK_PENDING. When PENDING is | |
3296 | * set, we just requeue the unblock. Only when the other | |
3297 | * thread has called dlm_lock() and cleared PENDING will | |
3298 | * we then cancel their request. | |
3299 | * | |
3300 | * All callers of dlm_lock() must set OCFS2_DLM_PENDING | |
3301 | * at the same time they set OCFS2_DLM_BUSY. They must | |
3302 | * clear OCFS2_DLM_PENDING after dlm_lock() returns. | |
3303 | */ | |
3304 | if (lockres->l_flags & OCFS2_LOCK_PENDING) | |
3305 | goto leave_requeue; | |
3306 | ||
d680efe9 | 3307 | ctl->requeue = 1; |
ccd979bd MF |
3308 | ret = ocfs2_prepare_cancel_convert(osb, lockres); |
3309 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3310 | if (ret) { | |
3311 | ret = ocfs2_cancel_convert(osb, lockres); | |
3312 | if (ret < 0) | |
3313 | mlog_errno(ret); | |
3314 | } | |
3315 | goto leave; | |
3316 | } | |
3317 | ||
3318 | /* if we're blocking an exclusive and we have *any* holders, | |
3319 | * then requeue. */ | |
bd3e7610 | 3320 | if ((lockres->l_blocking == DLM_LOCK_EX) |
f7fbfdd1 MF |
3321 | && (lockres->l_ex_holders || lockres->l_ro_holders)) |
3322 | goto leave_requeue; | |
ccd979bd MF |
3323 | |
3324 | /* If it's a PR we're blocking, then only | |
3325 | * requeue if we've got any EX holders */ | |
bd3e7610 | 3326 | if (lockres->l_blocking == DLM_LOCK_PR && |
f7fbfdd1 MF |
3327 | lockres->l_ex_holders) |
3328 | goto leave_requeue; | |
3329 | ||
3330 | /* | |
3331 | * Can we get a lock in this state if the holder counts are | |
3332 | * zero? The meta data unblock code used to check this. | |
3333 | */ | |
3334 | if ((lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) | |
3335 | && (lockres->l_flags & OCFS2_LOCK_REFRESHING)) | |
3336 | goto leave_requeue; | |
ccd979bd | 3337 | |
16d5b956 MF |
3338 | new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking); |
3339 | ||
3340 | if (lockres->l_ops->check_downconvert | |
3341 | && !lockres->l_ops->check_downconvert(lockres, new_level)) | |
3342 | goto leave_requeue; | |
3343 | ||
ccd979bd MF |
3344 | /* If we get here, then we know that there are no more |
3345 | * incompatible holders (and anyone asking for an incompatible | |
3346 | * lock is blocked). We can now downconvert the lock */ | |
cc567d89 | 3347 | if (!lockres->l_ops->downconvert_worker) |
ccd979bd MF |
3348 | goto downconvert; |
3349 | ||
3350 | /* Some lockres types want to do a bit of work before | |
3351 | * downconverting a lock. Allow that here. The worker function | |
3352 | * may sleep, so we save off a copy of what we're blocking as | |
3353 | * it may change while we're not holding the spin lock. */ | |
3354 | blocking = lockres->l_blocking; | |
3355 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3356 | ||
cc567d89 | 3357 | ctl->unblock_action = lockres->l_ops->downconvert_worker(lockres, blocking); |
d680efe9 MF |
3358 | |
3359 | if (ctl->unblock_action == UNBLOCK_STOP_POST) | |
3360 | goto leave; | |
ccd979bd MF |
3361 | |
3362 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3363 | if (blocking != lockres->l_blocking) { | |
3364 | /* If this changed underneath us, then we can't drop | |
3365 | * it just yet. */ | |
3366 | goto recheck; | |
3367 | } | |
3368 | ||
3369 | downconvert: | |
d680efe9 | 3370 | ctl->requeue = 0; |
ccd979bd | 3371 | |
5ef0d4ea | 3372 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) { |
bd3e7610 | 3373 | if (lockres->l_level == DLM_LOCK_EX) |
5ef0d4ea MF |
3374 | set_lvb = 1; |
3375 | ||
3376 | /* | |
3377 | * We only set the lvb if the lock has been fully | |
3378 | * refreshed - otherwise we risk setting stale | |
3379 | * data. Otherwise, there's no need to actually clear | |
3380 | * out the lvb here as it's value is still valid. | |
3381 | */ | |
3382 | if (set_lvb && !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) | |
3383 | lockres->l_ops->set_lvb(lockres); | |
3384 | } | |
3385 | ||
de551246 | 3386 | gen = ocfs2_prepare_downconvert(lockres, new_level); |
ccd979bd | 3387 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
de551246 JB |
3388 | ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb, |
3389 | gen); | |
3390 | ||
ccd979bd MF |
3391 | leave: |
3392 | mlog_exit(ret); | |
3393 | return ret; | |
f7fbfdd1 MF |
3394 | |
3395 | leave_requeue: | |
3396 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3397 | ctl->requeue = 1; | |
3398 | ||
3399 | mlog_exit(0); | |
3400 | return 0; | |
ccd979bd MF |
3401 | } |
3402 | ||
d680efe9 MF |
3403 | static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, |
3404 | int blocking) | |
ccd979bd MF |
3405 | { |
3406 | struct inode *inode; | |
3407 | struct address_space *mapping; | |
3408 | ||
ccd979bd MF |
3409 | inode = ocfs2_lock_res_inode(lockres); |
3410 | mapping = inode->i_mapping; | |
3411 | ||
1044e401 | 3412 | if (!S_ISREG(inode->i_mode)) |
f1f54068 MF |
3413 | goto out; |
3414 | ||
7f4a2a97 MF |
3415 | /* |
3416 | * We need this before the filemap_fdatawrite() so that it can | |
3417 | * transfer the dirty bit from the PTE to the | |
3418 | * page. Unfortunately this means that even for EX->PR | |
3419 | * downconverts, we'll lose our mappings and have to build | |
3420 | * them up again. | |
3421 | */ | |
3422 | unmap_mapping_range(mapping, 0, 0, 0); | |
3423 | ||
ccd979bd | 3424 | if (filemap_fdatawrite(mapping)) { |
b0697053 MF |
3425 | mlog(ML_ERROR, "Could not sync inode %llu for downconvert!", |
3426 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
ccd979bd MF |
3427 | } |
3428 | sync_mapping_buffers(mapping); | |
bd3e7610 | 3429 | if (blocking == DLM_LOCK_EX) { |
ccd979bd | 3430 | truncate_inode_pages(mapping, 0); |
ccd979bd MF |
3431 | } else { |
3432 | /* We only need to wait on the I/O if we're not also | |
3433 | * truncating pages because truncate_inode_pages waits | |
3434 | * for us above. We don't truncate pages if we're | |
3435 | * blocking anything < EXMODE because we want to keep | |
3436 | * them around in that case. */ | |
3437 | filemap_fdatawait(mapping); | |
3438 | } | |
3439 | ||
f1f54068 | 3440 | out: |
d680efe9 | 3441 | return UNBLOCK_CONTINUE; |
ccd979bd MF |
3442 | } |
3443 | ||
810d5aeb MF |
3444 | static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres, |
3445 | int new_level) | |
3446 | { | |
3447 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
3448 | int checkpointed = ocfs2_inode_fully_checkpointed(inode); | |
3449 | ||
bd3e7610 JB |
3450 | BUG_ON(new_level != DLM_LOCK_NL && new_level != DLM_LOCK_PR); |
3451 | BUG_ON(lockres->l_level != DLM_LOCK_EX && !checkpointed); | |
810d5aeb MF |
3452 | |
3453 | if (checkpointed) | |
3454 | return 1; | |
3455 | ||
3456 | ocfs2_start_checkpoint(OCFS2_SB(inode->i_sb)); | |
3457 | return 0; | |
3458 | } | |
3459 | ||
3460 | static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres) | |
3461 | { | |
3462 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
3463 | ||
3464 | __ocfs2_stuff_meta_lvb(inode); | |
3465 | } | |
3466 | ||
d680efe9 MF |
3467 | /* |
3468 | * Does the final reference drop on our dentry lock. Right now this | |
34d024f8 | 3469 | * happens in the downconvert thread, but we could choose to simplify the |
d680efe9 MF |
3470 | * dlmglue API and push these off to the ocfs2_wq in the future. |
3471 | */ | |
3472 | static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, | |
3473 | struct ocfs2_lock_res *lockres) | |
3474 | { | |
3475 | struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); | |
3476 | ocfs2_dentry_lock_put(osb, dl); | |
3477 | } | |
3478 | ||
3479 | /* | |
3480 | * d_delete() matching dentries before the lock downconvert. | |
3481 | * | |
3482 | * At this point, any process waiting to destroy the | |
3483 | * dentry_lock due to last ref count is stopped by the | |
3484 | * OCFS2_LOCK_QUEUED flag. | |
3485 | * | |
3486 | * We have two potential problems | |
3487 | * | |
3488 | * 1) If we do the last reference drop on our dentry_lock (via dput) | |
3489 | * we'll wind up in ocfs2_release_dentry_lock(), waiting on | |
3490 | * the downconvert to finish. Instead we take an elevated | |
3491 | * reference and push the drop until after we've completed our | |
3492 | * unblock processing. | |
3493 | * | |
3494 | * 2) There might be another process with a final reference, | |
3495 | * waiting on us to finish processing. If this is the case, we | |
3496 | * detect it and exit out - there's no more dentries anyway. | |
3497 | */ | |
3498 | static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, | |
3499 | int blocking) | |
3500 | { | |
3501 | struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); | |
3502 | struct ocfs2_inode_info *oi = OCFS2_I(dl->dl_inode); | |
3503 | struct dentry *dentry; | |
3504 | unsigned long flags; | |
3505 | int extra_ref = 0; | |
3506 | ||
3507 | /* | |
3508 | * This node is blocking another node from getting a read | |
3509 | * lock. This happens when we've renamed within a | |
3510 | * directory. We've forced the other nodes to d_delete(), but | |
3511 | * we never actually dropped our lock because it's still | |
3512 | * valid. The downconvert code will retain a PR for this node, | |
3513 | * so there's no further work to do. | |
3514 | */ | |
bd3e7610 | 3515 | if (blocking == DLM_LOCK_PR) |
d680efe9 MF |
3516 | return UNBLOCK_CONTINUE; |
3517 | ||
3518 | /* | |
3519 | * Mark this inode as potentially orphaned. The code in | |
3520 | * ocfs2_delete_inode() will figure out whether it actually | |
3521 | * needs to be freed or not. | |
3522 | */ | |
3523 | spin_lock(&oi->ip_lock); | |
3524 | oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED; | |
3525 | spin_unlock(&oi->ip_lock); | |
3526 | ||
3527 | /* | |
3528 | * Yuck. We need to make sure however that the check of | |
3529 | * OCFS2_LOCK_FREEING and the extra reference are atomic with | |
3530 | * respect to a reference decrement or the setting of that | |
3531 | * flag. | |
3532 | */ | |
3533 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3534 | spin_lock(&dentry_attach_lock); | |
3535 | if (!(lockres->l_flags & OCFS2_LOCK_FREEING) | |
3536 | && dl->dl_count) { | |
3537 | dl->dl_count++; | |
3538 | extra_ref = 1; | |
3539 | } | |
3540 | spin_unlock(&dentry_attach_lock); | |
3541 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3542 | ||
3543 | mlog(0, "extra_ref = %d\n", extra_ref); | |
3544 | ||
3545 | /* | |
3546 | * We have a process waiting on us in ocfs2_dentry_iput(), | |
3547 | * which means we can't have any more outstanding | |
3548 | * aliases. There's no need to do any more work. | |
3549 | */ | |
3550 | if (!extra_ref) | |
3551 | return UNBLOCK_CONTINUE; | |
3552 | ||
3553 | spin_lock(&dentry_attach_lock); | |
3554 | while (1) { | |
3555 | dentry = ocfs2_find_local_alias(dl->dl_inode, | |
3556 | dl->dl_parent_blkno, 1); | |
3557 | if (!dentry) | |
3558 | break; | |
3559 | spin_unlock(&dentry_attach_lock); | |
3560 | ||
3561 | mlog(0, "d_delete(%.*s);\n", dentry->d_name.len, | |
3562 | dentry->d_name.name); | |
3563 | ||
3564 | /* | |
3565 | * The following dcache calls may do an | |
3566 | * iput(). Normally we don't want that from the | |
3567 | * downconverting thread, but in this case it's ok | |
3568 | * because the requesting node already has an | |
3569 | * exclusive lock on the inode, so it can't be queued | |
3570 | * for a downconvert. | |
3571 | */ | |
3572 | d_delete(dentry); | |
3573 | dput(dentry); | |
3574 | ||
3575 | spin_lock(&dentry_attach_lock); | |
3576 | } | |
3577 | spin_unlock(&dentry_attach_lock); | |
3578 | ||
3579 | /* | |
3580 | * If we are the last holder of this dentry lock, there is no | |
3581 | * reason to downconvert so skip straight to the unlock. | |
3582 | */ | |
3583 | if (dl->dl_count == 1) | |
3584 | return UNBLOCK_STOP_POST; | |
3585 | ||
3586 | return UNBLOCK_CONTINUE_POST; | |
3587 | } | |
3588 | ||
9e33d69f JK |
3589 | static void ocfs2_set_qinfo_lvb(struct ocfs2_lock_res *lockres) |
3590 | { | |
3591 | struct ocfs2_qinfo_lvb *lvb; | |
3592 | struct ocfs2_mem_dqinfo *oinfo = ocfs2_lock_res_qinfo(lockres); | |
3593 | struct mem_dqinfo *info = sb_dqinfo(oinfo->dqi_gi.dqi_sb, | |
3594 | oinfo->dqi_gi.dqi_type); | |
3595 | ||
3596 | mlog_entry_void(); | |
3597 | ||
a641dc2a | 3598 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
9e33d69f JK |
3599 | lvb->lvb_version = OCFS2_QINFO_LVB_VERSION; |
3600 | lvb->lvb_bgrace = cpu_to_be32(info->dqi_bgrace); | |
3601 | lvb->lvb_igrace = cpu_to_be32(info->dqi_igrace); | |
3602 | lvb->lvb_syncms = cpu_to_be32(oinfo->dqi_syncms); | |
3603 | lvb->lvb_blocks = cpu_to_be32(oinfo->dqi_gi.dqi_blocks); | |
3604 | lvb->lvb_free_blk = cpu_to_be32(oinfo->dqi_gi.dqi_free_blk); | |
3605 | lvb->lvb_free_entry = cpu_to_be32(oinfo->dqi_gi.dqi_free_entry); | |
3606 | ||
3607 | mlog_exit_void(); | |
3608 | } | |
3609 | ||
3610 | void ocfs2_qinfo_unlock(struct ocfs2_mem_dqinfo *oinfo, int ex) | |
3611 | { | |
3612 | struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock; | |
3613 | struct ocfs2_super *osb = OCFS2_SB(oinfo->dqi_gi.dqi_sb); | |
3614 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; | |
3615 | ||
3616 | mlog_entry_void(); | |
3617 | if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb)) | |
3618 | ocfs2_cluster_unlock(osb, lockres, level); | |
3619 | mlog_exit_void(); | |
3620 | } | |
3621 | ||
3622 | static int ocfs2_refresh_qinfo(struct ocfs2_mem_dqinfo *oinfo) | |
3623 | { | |
3624 | struct mem_dqinfo *info = sb_dqinfo(oinfo->dqi_gi.dqi_sb, | |
3625 | oinfo->dqi_gi.dqi_type); | |
3626 | struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock; | |
3627 | struct ocfs2_qinfo_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
85eb8b73 | 3628 | struct buffer_head *bh = NULL; |
9e33d69f JK |
3629 | struct ocfs2_global_disk_dqinfo *gdinfo; |
3630 | int status = 0; | |
3631 | ||
1c520dfb JB |
3632 | if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) && |
3633 | lvb->lvb_version == OCFS2_QINFO_LVB_VERSION) { | |
9e33d69f JK |
3634 | info->dqi_bgrace = be32_to_cpu(lvb->lvb_bgrace); |
3635 | info->dqi_igrace = be32_to_cpu(lvb->lvb_igrace); | |
3636 | oinfo->dqi_syncms = be32_to_cpu(lvb->lvb_syncms); | |
3637 | oinfo->dqi_gi.dqi_blocks = be32_to_cpu(lvb->lvb_blocks); | |
3638 | oinfo->dqi_gi.dqi_free_blk = be32_to_cpu(lvb->lvb_free_blk); | |
3639 | oinfo->dqi_gi.dqi_free_entry = | |
3640 | be32_to_cpu(lvb->lvb_free_entry); | |
3641 | } else { | |
85eb8b73 JB |
3642 | status = ocfs2_read_quota_block(oinfo->dqi_gqinode, 0, &bh); |
3643 | if (status) { | |
9e33d69f JK |
3644 | mlog_errno(status); |
3645 | goto bail; | |
3646 | } | |
3647 | gdinfo = (struct ocfs2_global_disk_dqinfo *) | |
3648 | (bh->b_data + OCFS2_GLOBAL_INFO_OFF); | |
3649 | info->dqi_bgrace = le32_to_cpu(gdinfo->dqi_bgrace); | |
3650 | info->dqi_igrace = le32_to_cpu(gdinfo->dqi_igrace); | |
3651 | oinfo->dqi_syncms = le32_to_cpu(gdinfo->dqi_syncms); | |
3652 | oinfo->dqi_gi.dqi_blocks = le32_to_cpu(gdinfo->dqi_blocks); | |
3653 | oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(gdinfo->dqi_free_blk); | |
3654 | oinfo->dqi_gi.dqi_free_entry = | |
3655 | le32_to_cpu(gdinfo->dqi_free_entry); | |
3656 | brelse(bh); | |
3657 | ocfs2_track_lock_refresh(lockres); | |
3658 | } | |
3659 | ||
3660 | bail: | |
3661 | return status; | |
3662 | } | |
3663 | ||
3664 | /* Lock quota info, this function expects at least shared lock on the quota file | |
3665 | * so that we can safely refresh quota info from disk. */ | |
3666 | int ocfs2_qinfo_lock(struct ocfs2_mem_dqinfo *oinfo, int ex) | |
3667 | { | |
3668 | struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock; | |
3669 | struct ocfs2_super *osb = OCFS2_SB(oinfo->dqi_gi.dqi_sb); | |
3670 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; | |
3671 | int status = 0; | |
3672 | ||
3673 | mlog_entry_void(); | |
3674 | ||
3675 | /* On RO devices, locking really isn't needed... */ | |
3676 | if (ocfs2_is_hard_readonly(osb)) { | |
3677 | if (ex) | |
3678 | status = -EROFS; | |
3679 | goto bail; | |
3680 | } | |
3681 | if (ocfs2_mount_local(osb)) | |
3682 | goto bail; | |
3683 | ||
3684 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); | |
3685 | if (status < 0) { | |
3686 | mlog_errno(status); | |
3687 | goto bail; | |
3688 | } | |
3689 | if (!ocfs2_should_refresh_lock_res(lockres)) | |
3690 | goto bail; | |
3691 | /* OK, we have the lock but we need to refresh the quota info */ | |
3692 | status = ocfs2_refresh_qinfo(oinfo); | |
3693 | if (status) | |
3694 | ocfs2_qinfo_unlock(oinfo, ex); | |
3695 | ocfs2_complete_lock_res_refresh(lockres, status); | |
3696 | bail: | |
3697 | mlog_exit(status); | |
3698 | return status; | |
3699 | } | |
3700 | ||
4670c46d JB |
3701 | /* |
3702 | * This is the filesystem locking protocol. It provides the lock handling | |
3703 | * hooks for the underlying DLM. It has a maximum version number. | |
3704 | * The version number allows interoperability with systems running at | |
3705 | * the same major number and an equal or smaller minor number. | |
3706 | * | |
3707 | * Whenever the filesystem does new things with locks (adds or removes a | |
3708 | * lock, orders them differently, does different things underneath a lock), | |
3709 | * the version must be changed. The protocol is negotiated when joining | |
3710 | * the dlm domain. A node may join the domain if its major version is | |
3711 | * identical to all other nodes and its minor version is greater than | |
3712 | * or equal to all other nodes. When its minor version is greater than | |
3713 | * the other nodes, it will run at the minor version specified by the | |
3714 | * other nodes. | |
3715 | * | |
3716 | * If a locking change is made that will not be compatible with older | |
3717 | * versions, the major number must be increased and the minor version set | |
3718 | * to zero. If a change merely adds a behavior that can be disabled when | |
3719 | * speaking to older versions, the minor version must be increased. If a | |
3720 | * change adds a fully backwards compatible change (eg, LVB changes that | |
3721 | * are just ignored by older versions), the version does not need to be | |
3722 | * updated. | |
3723 | */ | |
24ef1815 | 3724 | static struct ocfs2_locking_protocol lproto = { |
4670c46d JB |
3725 | .lp_max_version = { |
3726 | .pv_major = OCFS2_LOCKING_PROTOCOL_MAJOR, | |
3727 | .pv_minor = OCFS2_LOCKING_PROTOCOL_MINOR, | |
3728 | }, | |
24ef1815 JB |
3729 | .lp_lock_ast = ocfs2_locking_ast, |
3730 | .lp_blocking_ast = ocfs2_blocking_ast, | |
3731 | .lp_unlock_ast = ocfs2_unlock_ast, | |
3732 | }; | |
3733 | ||
63e0c48a | 3734 | void ocfs2_set_locking_protocol(void) |
24ef1815 | 3735 | { |
63e0c48a | 3736 | ocfs2_stack_glue_set_locking_protocol(&lproto); |
24ef1815 JB |
3737 | } |
3738 | ||
24ef1815 | 3739 | |
00600056 AB |
3740 | static void ocfs2_process_blocked_lock(struct ocfs2_super *osb, |
3741 | struct ocfs2_lock_res *lockres) | |
ccd979bd MF |
3742 | { |
3743 | int status; | |
d680efe9 | 3744 | struct ocfs2_unblock_ctl ctl = {0, 0,}; |
ccd979bd MF |
3745 | unsigned long flags; |
3746 | ||
3747 | /* Our reference to the lockres in this function can be | |
3748 | * considered valid until we remove the OCFS2_LOCK_QUEUED | |
3749 | * flag. */ | |
3750 | ||
3751 | mlog_entry_void(); | |
3752 | ||
3753 | BUG_ON(!lockres); | |
3754 | BUG_ON(!lockres->l_ops); | |
ccd979bd MF |
3755 | |
3756 | mlog(0, "lockres %s blocked.\n", lockres->l_name); | |
3757 | ||
3758 | /* Detect whether a lock has been marked as going away while | |
34d024f8 | 3759 | * the downconvert thread was processing other things. A lock can |
ccd979bd MF |
3760 | * still be marked with OCFS2_LOCK_FREEING after this check, |
3761 | * but short circuiting here will still save us some | |
3762 | * performance. */ | |
3763 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3764 | if (lockres->l_flags & OCFS2_LOCK_FREEING) | |
3765 | goto unqueue; | |
3766 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3767 | ||
b5e500e2 | 3768 | status = ocfs2_unblock_lock(osb, lockres, &ctl); |
ccd979bd MF |
3769 | if (status < 0) |
3770 | mlog_errno(status); | |
3771 | ||
3772 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3773 | unqueue: | |
d680efe9 | 3774 | if (lockres->l_flags & OCFS2_LOCK_FREEING || !ctl.requeue) { |
ccd979bd MF |
3775 | lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED); |
3776 | } else | |
3777 | ocfs2_schedule_blocked_lock(osb, lockres); | |
3778 | ||
3779 | mlog(0, "lockres %s, requeue = %s.\n", lockres->l_name, | |
d680efe9 | 3780 | ctl.requeue ? "yes" : "no"); |
ccd979bd MF |
3781 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
3782 | ||
d680efe9 MF |
3783 | if (ctl.unblock_action != UNBLOCK_CONTINUE |
3784 | && lockres->l_ops->post_unlock) | |
3785 | lockres->l_ops->post_unlock(osb, lockres); | |
3786 | ||
ccd979bd MF |
3787 | mlog_exit_void(); |
3788 | } | |
3789 | ||
3790 | static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, | |
3791 | struct ocfs2_lock_res *lockres) | |
3792 | { | |
3793 | mlog_entry_void(); | |
3794 | ||
3795 | assert_spin_locked(&lockres->l_lock); | |
3796 | ||
3797 | if (lockres->l_flags & OCFS2_LOCK_FREEING) { | |
3798 | /* Do not schedule a lock for downconvert when it's on | |
3799 | * the way to destruction - any nodes wanting access | |
3800 | * to the resource will get it soon. */ | |
3801 | mlog(0, "Lockres %s won't be scheduled: flags 0x%lx\n", | |
3802 | lockres->l_name, lockres->l_flags); | |
3803 | return; | |
3804 | } | |
3805 | ||
3806 | lockres_or_flags(lockres, OCFS2_LOCK_QUEUED); | |
3807 | ||
34d024f8 | 3808 | spin_lock(&osb->dc_task_lock); |
ccd979bd MF |
3809 | if (list_empty(&lockres->l_blocked_list)) { |
3810 | list_add_tail(&lockres->l_blocked_list, | |
3811 | &osb->blocked_lock_list); | |
3812 | osb->blocked_lock_count++; | |
3813 | } | |
34d024f8 | 3814 | spin_unlock(&osb->dc_task_lock); |
ccd979bd MF |
3815 | |
3816 | mlog_exit_void(); | |
3817 | } | |
34d024f8 MF |
3818 | |
3819 | static void ocfs2_downconvert_thread_do_work(struct ocfs2_super *osb) | |
3820 | { | |
3821 | unsigned long processed; | |
3822 | struct ocfs2_lock_res *lockres; | |
3823 | ||
3824 | mlog_entry_void(); | |
3825 | ||
3826 | spin_lock(&osb->dc_task_lock); | |
3827 | /* grab this early so we know to try again if a state change and | |
3828 | * wake happens part-way through our work */ | |
3829 | osb->dc_work_sequence = osb->dc_wake_sequence; | |
3830 | ||
3831 | processed = osb->blocked_lock_count; | |
3832 | while (processed) { | |
3833 | BUG_ON(list_empty(&osb->blocked_lock_list)); | |
3834 | ||
3835 | lockres = list_entry(osb->blocked_lock_list.next, | |
3836 | struct ocfs2_lock_res, l_blocked_list); | |
3837 | list_del_init(&lockres->l_blocked_list); | |
3838 | osb->blocked_lock_count--; | |
3839 | spin_unlock(&osb->dc_task_lock); | |
3840 | ||
3841 | BUG_ON(!processed); | |
3842 | processed--; | |
3843 | ||
3844 | ocfs2_process_blocked_lock(osb, lockres); | |
3845 | ||
3846 | spin_lock(&osb->dc_task_lock); | |
3847 | } | |
3848 | spin_unlock(&osb->dc_task_lock); | |
3849 | ||
3850 | mlog_exit_void(); | |
3851 | } | |
3852 | ||
3853 | static int ocfs2_downconvert_thread_lists_empty(struct ocfs2_super *osb) | |
3854 | { | |
3855 | int empty = 0; | |
3856 | ||
3857 | spin_lock(&osb->dc_task_lock); | |
3858 | if (list_empty(&osb->blocked_lock_list)) | |
3859 | empty = 1; | |
3860 | ||
3861 | spin_unlock(&osb->dc_task_lock); | |
3862 | return empty; | |
3863 | } | |
3864 | ||
3865 | static int ocfs2_downconvert_thread_should_wake(struct ocfs2_super *osb) | |
3866 | { | |
3867 | int should_wake = 0; | |
3868 | ||
3869 | spin_lock(&osb->dc_task_lock); | |
3870 | if (osb->dc_work_sequence != osb->dc_wake_sequence) | |
3871 | should_wake = 1; | |
3872 | spin_unlock(&osb->dc_task_lock); | |
3873 | ||
3874 | return should_wake; | |
3875 | } | |
3876 | ||
200bfae3 | 3877 | static int ocfs2_downconvert_thread(void *arg) |
34d024f8 MF |
3878 | { |
3879 | int status = 0; | |
3880 | struct ocfs2_super *osb = arg; | |
3881 | ||
3882 | /* only quit once we've been asked to stop and there is no more | |
3883 | * work available */ | |
3884 | while (!(kthread_should_stop() && | |
3885 | ocfs2_downconvert_thread_lists_empty(osb))) { | |
3886 | ||
3887 | wait_event_interruptible(osb->dc_event, | |
3888 | ocfs2_downconvert_thread_should_wake(osb) || | |
3889 | kthread_should_stop()); | |
3890 | ||
3891 | mlog(0, "downconvert_thread: awoken\n"); | |
3892 | ||
3893 | ocfs2_downconvert_thread_do_work(osb); | |
3894 | } | |
3895 | ||
3896 | osb->dc_task = NULL; | |
3897 | return status; | |
3898 | } | |
3899 | ||
3900 | void ocfs2_wake_downconvert_thread(struct ocfs2_super *osb) | |
3901 | { | |
3902 | spin_lock(&osb->dc_task_lock); | |
3903 | /* make sure the voting thread gets a swipe at whatever changes | |
3904 | * the caller may have made to the voting state */ | |
3905 | osb->dc_wake_sequence++; | |
3906 | spin_unlock(&osb->dc_task_lock); | |
3907 | wake_up(&osb->dc_event); | |
3908 | } |