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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" |
8dec98ed | 56 | #include "refcounttree.h" |
ccd979bd MF |
57 | |
58 | #include "buffer_head_io.h" | |
59 | ||
60 | struct ocfs2_mask_waiter { | |
61 | struct list_head mw_item; | |
62 | int mw_status; | |
63 | struct completion mw_complete; | |
64 | unsigned long mw_mask; | |
65 | unsigned long mw_goal; | |
8ddb7b00 | 66 | #ifdef CONFIG_OCFS2_FS_STATS |
5bc970e8 | 67 | ktime_t mw_lock_start; |
8ddb7b00 | 68 | #endif |
ccd979bd MF |
69 | }; |
70 | ||
54a7e755 MF |
71 | static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres); |
72 | static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres); | |
cf8e06f1 | 73 | static struct ocfs2_super *ocfs2_get_file_osb(struct ocfs2_lock_res *lockres); |
9e33d69f | 74 | static struct ocfs2_super *ocfs2_get_qinfo_osb(struct ocfs2_lock_res *lockres); |
ccd979bd | 75 | |
d680efe9 | 76 | /* |
cc567d89 | 77 | * Return value from ->downconvert_worker functions. |
d680efe9 | 78 | * |
b5e500e2 | 79 | * These control the precise actions of ocfs2_unblock_lock() |
d680efe9 MF |
80 | * and ocfs2_process_blocked_lock() |
81 | * | |
82 | */ | |
83 | enum ocfs2_unblock_action { | |
84 | UNBLOCK_CONTINUE = 0, /* Continue downconvert */ | |
85 | UNBLOCK_CONTINUE_POST = 1, /* Continue downconvert, fire | |
86 | * ->post_unlock callback */ | |
87 | UNBLOCK_STOP_POST = 2, /* Do not downconvert, fire | |
88 | * ->post_unlock() callback. */ | |
89 | }; | |
90 | ||
91 | struct ocfs2_unblock_ctl { | |
92 | int requeue; | |
93 | enum ocfs2_unblock_action unblock_action; | |
94 | }; | |
95 | ||
cb25797d JK |
96 | /* Lockdep class keys */ |
97 | struct lock_class_key lockdep_keys[OCFS2_NUM_LOCK_TYPES]; | |
98 | ||
810d5aeb MF |
99 | static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres, |
100 | int new_level); | |
101 | static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres); | |
102 | ||
cc567d89 MF |
103 | static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, |
104 | int blocking); | |
105 | ||
cc567d89 MF |
106 | static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, |
107 | int blocking); | |
d680efe9 MF |
108 | |
109 | static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, | |
110 | struct ocfs2_lock_res *lockres); | |
ccd979bd | 111 | |
9e33d69f | 112 | static void ocfs2_set_qinfo_lvb(struct ocfs2_lock_res *lockres); |
6cb129f5 | 113 | |
8dec98ed TM |
114 | static int ocfs2_check_refcount_downconvert(struct ocfs2_lock_res *lockres, |
115 | int new_level); | |
116 | static int ocfs2_refcount_convert_worker(struct ocfs2_lock_res *lockres, | |
117 | int blocking); | |
118 | ||
6cb129f5 AB |
119 | #define mlog_meta_lvb(__level, __lockres) ocfs2_dump_meta_lvb_info(__level, __PRETTY_FUNCTION__, __LINE__, __lockres) |
120 | ||
121 | /* This aids in debugging situations where a bad LVB might be involved. */ | |
122 | static void ocfs2_dump_meta_lvb_info(u64 level, | |
123 | const char *function, | |
124 | unsigned int line, | |
125 | struct ocfs2_lock_res *lockres) | |
126 | { | |
a641dc2a | 127 | struct ocfs2_meta_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
6cb129f5 AB |
128 | |
129 | mlog(level, "LVB information for %s (called from %s:%u):\n", | |
130 | lockres->l_name, function, line); | |
131 | mlog(level, "version: %u, clusters: %u, generation: 0x%x\n", | |
132 | lvb->lvb_version, be32_to_cpu(lvb->lvb_iclusters), | |
133 | be32_to_cpu(lvb->lvb_igeneration)); | |
134 | mlog(level, "size: %llu, uid %u, gid %u, mode 0x%x\n", | |
135 | (unsigned long long)be64_to_cpu(lvb->lvb_isize), | |
136 | be32_to_cpu(lvb->lvb_iuid), be32_to_cpu(lvb->lvb_igid), | |
137 | be16_to_cpu(lvb->lvb_imode)); | |
138 | mlog(level, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, " | |
139 | "mtime_packed 0x%llx iattr 0x%x\n", be16_to_cpu(lvb->lvb_inlink), | |
140 | (long long)be64_to_cpu(lvb->lvb_iatime_packed), | |
141 | (long long)be64_to_cpu(lvb->lvb_ictime_packed), | |
142 | (long long)be64_to_cpu(lvb->lvb_imtime_packed), | |
143 | be32_to_cpu(lvb->lvb_iattr)); | |
144 | } | |
145 | ||
146 | ||
f625c979 MF |
147 | /* |
148 | * OCFS2 Lock Resource Operations | |
149 | * | |
150 | * These fine tune the behavior of the generic dlmglue locking infrastructure. | |
0d5dc6c2 MF |
151 | * |
152 | * The most basic of lock types can point ->l_priv to their respective | |
153 | * struct ocfs2_super and allow the default actions to manage things. | |
154 | * | |
155 | * Right now, each lock type also needs to implement an init function, | |
156 | * and trivial lock/unlock wrappers. ocfs2_simple_drop_lockres() | |
157 | * should be called when the lock is no longer needed (i.e., object | |
158 | * destruction time). | |
f625c979 | 159 | */ |
ccd979bd | 160 | struct ocfs2_lock_res_ops { |
54a7e755 MF |
161 | /* |
162 | * Translate an ocfs2_lock_res * into an ocfs2_super *. Define | |
163 | * this callback if ->l_priv is not an ocfs2_super pointer | |
164 | */ | |
165 | struct ocfs2_super * (*get_osb)(struct ocfs2_lock_res *); | |
b5e500e2 | 166 | |
0d5dc6c2 | 167 | /* |
34d024f8 MF |
168 | * Optionally called in the downconvert thread after a |
169 | * successful downconvert. The lockres will not be referenced | |
170 | * after this callback is called, so it is safe to free | |
171 | * memory, etc. | |
0d5dc6c2 MF |
172 | * |
173 | * The exact semantics of when this is called are controlled | |
174 | * by ->downconvert_worker() | |
175 | */ | |
d680efe9 | 176 | void (*post_unlock)(struct ocfs2_super *, struct ocfs2_lock_res *); |
f625c979 | 177 | |
16d5b956 MF |
178 | /* |
179 | * Allow a lock type to add checks to determine whether it is | |
180 | * safe to downconvert a lock. Return 0 to re-queue the | |
181 | * downconvert at a later time, nonzero to continue. | |
182 | * | |
183 | * For most locks, the default checks that there are no | |
184 | * incompatible holders are sufficient. | |
185 | * | |
186 | * Called with the lockres spinlock held. | |
187 | */ | |
188 | int (*check_downconvert)(struct ocfs2_lock_res *, int); | |
189 | ||
5ef0d4ea MF |
190 | /* |
191 | * Allows a lock type to populate the lock value block. This | |
192 | * is called on downconvert, and when we drop a lock. | |
193 | * | |
194 | * Locks that want to use this should set LOCK_TYPE_USES_LVB | |
195 | * in the flags field. | |
196 | * | |
197 | * Called with the lockres spinlock held. | |
198 | */ | |
199 | void (*set_lvb)(struct ocfs2_lock_res *); | |
200 | ||
cc567d89 MF |
201 | /* |
202 | * Called from the downconvert thread when it is determined | |
203 | * that a lock will be downconverted. This is called without | |
204 | * any locks held so the function can do work that might | |
205 | * schedule (syncing out data, etc). | |
206 | * | |
207 | * This should return any one of the ocfs2_unblock_action | |
208 | * values, depending on what it wants the thread to do. | |
209 | */ | |
210 | int (*downconvert_worker)(struct ocfs2_lock_res *, int); | |
211 | ||
f625c979 MF |
212 | /* |
213 | * LOCK_TYPE_* flags which describe the specific requirements | |
214 | * of a lock type. Descriptions of each individual flag follow. | |
215 | */ | |
216 | int flags; | |
ccd979bd MF |
217 | }; |
218 | ||
f625c979 MF |
219 | /* |
220 | * Some locks want to "refresh" potentially stale data when a | |
221 | * meaningful (PRMODE or EXMODE) lock level is first obtained. If this | |
222 | * flag is set, the OCFS2_LOCK_NEEDS_REFRESH flag will be set on the | |
223 | * individual lockres l_flags member from the ast function. It is | |
224 | * expected that the locking wrapper will clear the | |
225 | * OCFS2_LOCK_NEEDS_REFRESH flag when done. | |
226 | */ | |
227 | #define LOCK_TYPE_REQUIRES_REFRESH 0x1 | |
228 | ||
b80fc012 | 229 | /* |
5ef0d4ea MF |
230 | * Indicate that a lock type makes use of the lock value block. The |
231 | * ->set_lvb lock type callback must be defined. | |
b80fc012 MF |
232 | */ |
233 | #define LOCK_TYPE_USES_LVB 0x2 | |
234 | ||
ccd979bd | 235 | static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = { |
54a7e755 | 236 | .get_osb = ocfs2_get_inode_osb, |
f625c979 | 237 | .flags = 0, |
ccd979bd MF |
238 | }; |
239 | ||
e63aecb6 | 240 | static struct ocfs2_lock_res_ops ocfs2_inode_inode_lops = { |
54a7e755 | 241 | .get_osb = ocfs2_get_inode_osb, |
810d5aeb MF |
242 | .check_downconvert = ocfs2_check_meta_downconvert, |
243 | .set_lvb = ocfs2_set_meta_lvb, | |
f1f54068 | 244 | .downconvert_worker = ocfs2_data_convert_worker, |
b80fc012 | 245 | .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB, |
ccd979bd MF |
246 | }; |
247 | ||
ccd979bd | 248 | static struct ocfs2_lock_res_ops ocfs2_super_lops = { |
f625c979 | 249 | .flags = LOCK_TYPE_REQUIRES_REFRESH, |
ccd979bd MF |
250 | }; |
251 | ||
252 | static struct ocfs2_lock_res_ops ocfs2_rename_lops = { | |
f625c979 | 253 | .flags = 0, |
ccd979bd MF |
254 | }; |
255 | ||
6ca497a8 | 256 | static struct ocfs2_lock_res_ops ocfs2_nfs_sync_lops = { |
257 | .flags = 0, | |
258 | }; | |
259 | ||
83273932 SE |
260 | static struct ocfs2_lock_res_ops ocfs2_orphan_scan_lops = { |
261 | .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB, | |
262 | }; | |
263 | ||
d680efe9 | 264 | static struct ocfs2_lock_res_ops ocfs2_dentry_lops = { |
54a7e755 | 265 | .get_osb = ocfs2_get_dentry_osb, |
d680efe9 | 266 | .post_unlock = ocfs2_dentry_post_unlock, |
cc567d89 | 267 | .downconvert_worker = ocfs2_dentry_convert_worker, |
f625c979 | 268 | .flags = 0, |
d680efe9 MF |
269 | }; |
270 | ||
50008630 TY |
271 | static struct ocfs2_lock_res_ops ocfs2_inode_open_lops = { |
272 | .get_osb = ocfs2_get_inode_osb, | |
273 | .flags = 0, | |
274 | }; | |
275 | ||
cf8e06f1 MF |
276 | static struct ocfs2_lock_res_ops ocfs2_flock_lops = { |
277 | .get_osb = ocfs2_get_file_osb, | |
278 | .flags = 0, | |
279 | }; | |
280 | ||
9e33d69f JK |
281 | static struct ocfs2_lock_res_ops ocfs2_qinfo_lops = { |
282 | .set_lvb = ocfs2_set_qinfo_lvb, | |
283 | .get_osb = ocfs2_get_qinfo_osb, | |
284 | .flags = LOCK_TYPE_REQUIRES_REFRESH | LOCK_TYPE_USES_LVB, | |
285 | }; | |
286 | ||
8dec98ed TM |
287 | static struct ocfs2_lock_res_ops ocfs2_refcount_block_lops = { |
288 | .check_downconvert = ocfs2_check_refcount_downconvert, | |
289 | .downconvert_worker = ocfs2_refcount_convert_worker, | |
290 | .flags = 0, | |
291 | }; | |
292 | ||
ccd979bd MF |
293 | static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres) |
294 | { | |
295 | return lockres->l_type == OCFS2_LOCK_TYPE_META || | |
50008630 TY |
296 | lockres->l_type == OCFS2_LOCK_TYPE_RW || |
297 | lockres->l_type == OCFS2_LOCK_TYPE_OPEN; | |
ccd979bd MF |
298 | } |
299 | ||
c0e41338 | 300 | static inline struct ocfs2_lock_res *ocfs2_lksb_to_lock_res(struct ocfs2_dlm_lksb *lksb) |
a796d286 JB |
301 | { |
302 | return container_of(lksb, struct ocfs2_lock_res, l_lksb); | |
303 | } | |
304 | ||
ccd979bd MF |
305 | static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres) |
306 | { | |
307 | BUG_ON(!ocfs2_is_inode_lock(lockres)); | |
308 | ||
309 | return (struct inode *) lockres->l_priv; | |
310 | } | |
311 | ||
d680efe9 MF |
312 | static inline struct ocfs2_dentry_lock *ocfs2_lock_res_dl(struct ocfs2_lock_res *lockres) |
313 | { | |
314 | BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_DENTRY); | |
315 | ||
316 | return (struct ocfs2_dentry_lock *)lockres->l_priv; | |
317 | } | |
318 | ||
9e33d69f JK |
319 | static inline struct ocfs2_mem_dqinfo *ocfs2_lock_res_qinfo(struct ocfs2_lock_res *lockres) |
320 | { | |
321 | BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_QINFO); | |
322 | ||
323 | return (struct ocfs2_mem_dqinfo *)lockres->l_priv; | |
324 | } | |
325 | ||
8dec98ed TM |
326 | static inline struct ocfs2_refcount_tree * |
327 | ocfs2_lock_res_refcount_tree(struct ocfs2_lock_res *res) | |
328 | { | |
329 | return container_of(res, struct ocfs2_refcount_tree, rf_lockres); | |
330 | } | |
331 | ||
54a7e755 MF |
332 | static inline struct ocfs2_super *ocfs2_get_lockres_osb(struct ocfs2_lock_res *lockres) |
333 | { | |
334 | if (lockres->l_ops->get_osb) | |
335 | return lockres->l_ops->get_osb(lockres); | |
336 | ||
337 | return (struct ocfs2_super *)lockres->l_priv; | |
338 | } | |
339 | ||
ccd979bd MF |
340 | static int ocfs2_lock_create(struct ocfs2_super *osb, |
341 | struct ocfs2_lock_res *lockres, | |
342 | int level, | |
bd3e7610 | 343 | u32 dlm_flags); |
ccd979bd MF |
344 | static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, |
345 | int wanted); | |
cb25797d JK |
346 | static void __ocfs2_cluster_unlock(struct ocfs2_super *osb, |
347 | struct ocfs2_lock_res *lockres, | |
348 | int level, unsigned long caller_ip); | |
349 | static inline void ocfs2_cluster_unlock(struct ocfs2_super *osb, | |
350 | struct ocfs2_lock_res *lockres, | |
351 | int level) | |
352 | { | |
353 | __ocfs2_cluster_unlock(osb, lockres, level, _RET_IP_); | |
354 | } | |
355 | ||
ccd979bd MF |
356 | static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres); |
357 | static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres); | |
358 | static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres); | |
359 | static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, int level); | |
360 | static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, | |
361 | struct ocfs2_lock_res *lockres); | |
362 | static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, | |
363 | int convert); | |
c74ff8bb SM |
364 | #define ocfs2_log_dlm_error(_func, _err, _lockres) do { \ |
365 | if ((_lockres)->l_type != OCFS2_LOCK_TYPE_DENTRY) \ | |
366 | mlog(ML_ERROR, "DLM error %d while calling %s on resource %s\n", \ | |
367 | _err, _func, _lockres->l_name); \ | |
368 | else \ | |
369 | mlog(ML_ERROR, "DLM error %d while calling %s on resource %.*s%08x\n", \ | |
370 | _err, _func, OCFS2_DENTRY_LOCK_INO_START - 1, (_lockres)->l_name, \ | |
371 | (unsigned int)ocfs2_get_dentry_lock_ino(_lockres)); \ | |
ccd979bd | 372 | } while (0) |
34d024f8 MF |
373 | static int ocfs2_downconvert_thread(void *arg); |
374 | static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb, | |
375 | struct ocfs2_lock_res *lockres); | |
e63aecb6 | 376 | static int ocfs2_inode_lock_update(struct inode *inode, |
ccd979bd MF |
377 | struct buffer_head **bh); |
378 | static void ocfs2_drop_osb_locks(struct ocfs2_super *osb); | |
379 | static inline int ocfs2_highest_compat_lock_level(int level); | |
de551246 JB |
380 | static unsigned int ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres, |
381 | int new_level); | |
cf8e06f1 MF |
382 | static int ocfs2_downconvert_lock(struct ocfs2_super *osb, |
383 | struct ocfs2_lock_res *lockres, | |
384 | int new_level, | |
de551246 JB |
385 | int lvb, |
386 | unsigned int generation); | |
cf8e06f1 MF |
387 | static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb, |
388 | struct ocfs2_lock_res *lockres); | |
389 | static int ocfs2_cancel_convert(struct ocfs2_super *osb, | |
390 | struct ocfs2_lock_res *lockres); | |
391 | ||
ccd979bd | 392 | |
ccd979bd MF |
393 | static void ocfs2_build_lock_name(enum ocfs2_lock_type type, |
394 | u64 blkno, | |
395 | u32 generation, | |
396 | char *name) | |
397 | { | |
398 | int len; | |
399 | ||
ccd979bd MF |
400 | BUG_ON(type >= OCFS2_NUM_LOCK_TYPES); |
401 | ||
b0697053 MF |
402 | len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016llx%08x", |
403 | ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD, | |
404 | (long long)blkno, generation); | |
ccd979bd MF |
405 | |
406 | BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1)); | |
407 | ||
408 | mlog(0, "built lock resource with name: %s\n", name); | |
ccd979bd MF |
409 | } |
410 | ||
34af946a | 411 | static DEFINE_SPINLOCK(ocfs2_dlm_tracking_lock); |
ccd979bd MF |
412 | |
413 | static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res, | |
414 | struct ocfs2_dlm_debug *dlm_debug) | |
415 | { | |
416 | mlog(0, "Add tracking for lockres %s\n", res->l_name); | |
417 | ||
418 | spin_lock(&ocfs2_dlm_tracking_lock); | |
419 | list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking); | |
420 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
421 | } | |
422 | ||
423 | static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res) | |
424 | { | |
425 | spin_lock(&ocfs2_dlm_tracking_lock); | |
426 | if (!list_empty(&res->l_debug_list)) | |
427 | list_del_init(&res->l_debug_list); | |
428 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
429 | } | |
430 | ||
8ddb7b00 SM |
431 | #ifdef CONFIG_OCFS2_FS_STATS |
432 | static void ocfs2_init_lock_stats(struct ocfs2_lock_res *res) | |
433 | { | |
8ddb7b00 | 434 | res->l_lock_refresh = 0; |
5bc970e8 SM |
435 | memset(&res->l_lock_prmode, 0, sizeof(struct ocfs2_lock_stats)); |
436 | memset(&res->l_lock_exmode, 0, sizeof(struct ocfs2_lock_stats)); | |
8ddb7b00 SM |
437 | } |
438 | ||
439 | static void ocfs2_update_lock_stats(struct ocfs2_lock_res *res, int level, | |
440 | struct ocfs2_mask_waiter *mw, int ret) | |
441 | { | |
5bc970e8 SM |
442 | u32 usec; |
443 | ktime_t kt; | |
444 | struct ocfs2_lock_stats *stats; | |
445 | ||
446 | if (level == LKM_PRMODE) | |
447 | stats = &res->l_lock_prmode; | |
448 | else if (level == LKM_EXMODE) | |
449 | stats = &res->l_lock_exmode; | |
450 | else | |
8ddb7b00 SM |
451 | return; |
452 | ||
5bc970e8 SM |
453 | kt = ktime_sub(ktime_get(), mw->mw_lock_start); |
454 | usec = ktime_to_us(kt); | |
455 | ||
456 | stats->ls_gets++; | |
457 | stats->ls_total += ktime_to_ns(kt); | |
458 | /* overflow */ | |
16865b7c | 459 | if (unlikely(stats->ls_gets == 0)) { |
5bc970e8 SM |
460 | stats->ls_gets++; |
461 | stats->ls_total = ktime_to_ns(kt); | |
462 | } | |
463 | ||
464 | if (stats->ls_max < usec) | |
465 | stats->ls_max = usec; | |
466 | ||
8ddb7b00 | 467 | if (ret) |
5bc970e8 | 468 | stats->ls_fail++; |
8ddb7b00 SM |
469 | } |
470 | ||
471 | static inline void ocfs2_track_lock_refresh(struct ocfs2_lock_res *lockres) | |
472 | { | |
473 | lockres->l_lock_refresh++; | |
474 | } | |
475 | ||
476 | static inline void ocfs2_init_start_time(struct ocfs2_mask_waiter *mw) | |
477 | { | |
5bc970e8 | 478 | mw->mw_lock_start = ktime_get(); |
8ddb7b00 SM |
479 | } |
480 | #else | |
481 | static inline void ocfs2_init_lock_stats(struct ocfs2_lock_res *res) | |
482 | { | |
483 | } | |
484 | static inline void ocfs2_update_lock_stats(struct ocfs2_lock_res *res, | |
485 | int level, struct ocfs2_mask_waiter *mw, int ret) | |
486 | { | |
487 | } | |
488 | static inline void ocfs2_track_lock_refresh(struct ocfs2_lock_res *lockres) | |
489 | { | |
490 | } | |
491 | static inline void ocfs2_init_start_time(struct ocfs2_mask_waiter *mw) | |
492 | { | |
493 | } | |
494 | #endif | |
495 | ||
ccd979bd MF |
496 | static void ocfs2_lock_res_init_common(struct ocfs2_super *osb, |
497 | struct ocfs2_lock_res *res, | |
498 | enum ocfs2_lock_type type, | |
ccd979bd MF |
499 | struct ocfs2_lock_res_ops *ops, |
500 | void *priv) | |
501 | { | |
ccd979bd MF |
502 | res->l_type = type; |
503 | res->l_ops = ops; | |
504 | res->l_priv = priv; | |
505 | ||
bd3e7610 JB |
506 | res->l_level = DLM_LOCK_IV; |
507 | res->l_requested = DLM_LOCK_IV; | |
508 | res->l_blocking = DLM_LOCK_IV; | |
ccd979bd MF |
509 | res->l_action = OCFS2_AST_INVALID; |
510 | res->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
511 | ||
512 | res->l_flags = OCFS2_LOCK_INITIALIZED; | |
513 | ||
514 | ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug); | |
8ddb7b00 SM |
515 | |
516 | ocfs2_init_lock_stats(res); | |
cb25797d JK |
517 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
518 | if (type != OCFS2_LOCK_TYPE_OPEN) | |
519 | lockdep_init_map(&res->l_lockdep_map, ocfs2_lock_type_strings[type], | |
520 | &lockdep_keys[type], 0); | |
521 | else | |
522 | res->l_lockdep_map.key = NULL; | |
523 | #endif | |
ccd979bd MF |
524 | } |
525 | ||
526 | void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res) | |
527 | { | |
528 | /* This also clears out the lock status block */ | |
529 | memset(res, 0, sizeof(struct ocfs2_lock_res)); | |
530 | spin_lock_init(&res->l_lock); | |
531 | init_waitqueue_head(&res->l_event); | |
532 | INIT_LIST_HEAD(&res->l_blocked_list); | |
533 | INIT_LIST_HEAD(&res->l_mask_waiters); | |
534 | } | |
535 | ||
536 | void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res, | |
537 | enum ocfs2_lock_type type, | |
24c19ef4 | 538 | unsigned int generation, |
ccd979bd MF |
539 | struct inode *inode) |
540 | { | |
541 | struct ocfs2_lock_res_ops *ops; | |
542 | ||
543 | switch(type) { | |
544 | case OCFS2_LOCK_TYPE_RW: | |
545 | ops = &ocfs2_inode_rw_lops; | |
546 | break; | |
547 | case OCFS2_LOCK_TYPE_META: | |
e63aecb6 | 548 | ops = &ocfs2_inode_inode_lops; |
ccd979bd | 549 | break; |
50008630 TY |
550 | case OCFS2_LOCK_TYPE_OPEN: |
551 | ops = &ocfs2_inode_open_lops; | |
552 | break; | |
ccd979bd MF |
553 | default: |
554 | mlog_bug_on_msg(1, "type: %d\n", type); | |
555 | ops = NULL; /* thanks, gcc */ | |
556 | break; | |
557 | }; | |
558 | ||
d680efe9 | 559 | ocfs2_build_lock_name(type, OCFS2_I(inode)->ip_blkno, |
24c19ef4 | 560 | generation, res->l_name); |
d680efe9 MF |
561 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type, ops, inode); |
562 | } | |
563 | ||
54a7e755 MF |
564 | static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres) |
565 | { | |
566 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
567 | ||
568 | return OCFS2_SB(inode->i_sb); | |
569 | } | |
570 | ||
9e33d69f JK |
571 | static struct ocfs2_super *ocfs2_get_qinfo_osb(struct ocfs2_lock_res *lockres) |
572 | { | |
573 | struct ocfs2_mem_dqinfo *info = lockres->l_priv; | |
574 | ||
575 | return OCFS2_SB(info->dqi_gi.dqi_sb); | |
576 | } | |
577 | ||
cf8e06f1 MF |
578 | static struct ocfs2_super *ocfs2_get_file_osb(struct ocfs2_lock_res *lockres) |
579 | { | |
580 | struct ocfs2_file_private *fp = lockres->l_priv; | |
581 | ||
582 | return OCFS2_SB(fp->fp_file->f_mapping->host->i_sb); | |
583 | } | |
584 | ||
d680efe9 MF |
585 | static __u64 ocfs2_get_dentry_lock_ino(struct ocfs2_lock_res *lockres) |
586 | { | |
587 | __be64 inode_blkno_be; | |
588 | ||
589 | memcpy(&inode_blkno_be, &lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], | |
590 | sizeof(__be64)); | |
591 | ||
592 | return be64_to_cpu(inode_blkno_be); | |
593 | } | |
594 | ||
54a7e755 MF |
595 | static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres) |
596 | { | |
597 | struct ocfs2_dentry_lock *dl = lockres->l_priv; | |
598 | ||
599 | return OCFS2_SB(dl->dl_inode->i_sb); | |
600 | } | |
601 | ||
d680efe9 MF |
602 | void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl, |
603 | u64 parent, struct inode *inode) | |
604 | { | |
605 | int len; | |
606 | u64 inode_blkno = OCFS2_I(inode)->ip_blkno; | |
607 | __be64 inode_blkno_be = cpu_to_be64(inode_blkno); | |
608 | struct ocfs2_lock_res *lockres = &dl->dl_lockres; | |
609 | ||
610 | ocfs2_lock_res_init_once(lockres); | |
611 | ||
612 | /* | |
613 | * Unfortunately, the standard lock naming scheme won't work | |
614 | * here because we have two 16 byte values to use. Instead, | |
615 | * we'll stuff the inode number as a binary value. We still | |
616 | * want error prints to show something without garbling the | |
617 | * display, so drop a null byte in there before the inode | |
618 | * number. A future version of OCFS2 will likely use all | |
619 | * binary lock names. The stringified names have been a | |
620 | * tremendous aid in debugging, but now that the debugfs | |
621 | * interface exists, we can mangle things there if need be. | |
622 | * | |
623 | * NOTE: We also drop the standard "pad" value (the total lock | |
624 | * name size stays the same though - the last part is all | |
625 | * zeros due to the memset in ocfs2_lock_res_init_once() | |
626 | */ | |
627 | len = snprintf(lockres->l_name, OCFS2_DENTRY_LOCK_INO_START, | |
628 | "%c%016llx", | |
629 | ocfs2_lock_type_char(OCFS2_LOCK_TYPE_DENTRY), | |
630 | (long long)parent); | |
631 | ||
632 | BUG_ON(len != (OCFS2_DENTRY_LOCK_INO_START - 1)); | |
633 | ||
634 | memcpy(&lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], &inode_blkno_be, | |
635 | sizeof(__be64)); | |
636 | ||
637 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres, | |
638 | OCFS2_LOCK_TYPE_DENTRY, &ocfs2_dentry_lops, | |
639 | dl); | |
ccd979bd MF |
640 | } |
641 | ||
642 | static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res, | |
643 | struct ocfs2_super *osb) | |
644 | { | |
645 | /* Superblock lockres doesn't come from a slab so we call init | |
646 | * once on it manually. */ | |
647 | ocfs2_lock_res_init_once(res); | |
d680efe9 MF |
648 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_SUPER, OCFS2_SUPER_BLOCK_BLKNO, |
649 | 0, res->l_name); | |
ccd979bd | 650 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER, |
ccd979bd MF |
651 | &ocfs2_super_lops, osb); |
652 | } | |
653 | ||
654 | static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res, | |
655 | struct ocfs2_super *osb) | |
656 | { | |
657 | /* Rename lockres doesn't come from a slab so we call init | |
658 | * once on it manually. */ | |
659 | ocfs2_lock_res_init_once(res); | |
d680efe9 MF |
660 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_RENAME, 0, 0, res->l_name); |
661 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME, | |
ccd979bd MF |
662 | &ocfs2_rename_lops, osb); |
663 | } | |
664 | ||
6ca497a8 | 665 | static void ocfs2_nfs_sync_lock_res_init(struct ocfs2_lock_res *res, |
666 | struct ocfs2_super *osb) | |
667 | { | |
668 | /* nfs_sync lockres doesn't come from a slab so we call init | |
669 | * once on it manually. */ | |
670 | ocfs2_lock_res_init_once(res); | |
671 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_NFS_SYNC, 0, 0, res->l_name); | |
672 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_NFS_SYNC, | |
673 | &ocfs2_nfs_sync_lops, osb); | |
674 | } | |
675 | ||
83273932 SE |
676 | static void ocfs2_orphan_scan_lock_res_init(struct ocfs2_lock_res *res, |
677 | struct ocfs2_super *osb) | |
678 | { | |
83273932 SE |
679 | ocfs2_lock_res_init_once(res); |
680 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_ORPHAN_SCAN, 0, 0, res->l_name); | |
681 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_ORPHAN_SCAN, | |
682 | &ocfs2_orphan_scan_lops, osb); | |
83273932 SE |
683 | } |
684 | ||
cf8e06f1 MF |
685 | void ocfs2_file_lock_res_init(struct ocfs2_lock_res *lockres, |
686 | struct ocfs2_file_private *fp) | |
687 | { | |
688 | struct inode *inode = fp->fp_file->f_mapping->host; | |
689 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
690 | ||
691 | ocfs2_lock_res_init_once(lockres); | |
692 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_FLOCK, oi->ip_blkno, | |
693 | inode->i_generation, lockres->l_name); | |
694 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres, | |
695 | OCFS2_LOCK_TYPE_FLOCK, &ocfs2_flock_lops, | |
696 | fp); | |
697 | lockres->l_flags |= OCFS2_LOCK_NOCACHE; | |
698 | } | |
699 | ||
9e33d69f JK |
700 | void ocfs2_qinfo_lock_res_init(struct ocfs2_lock_res *lockres, |
701 | struct ocfs2_mem_dqinfo *info) | |
702 | { | |
703 | ocfs2_lock_res_init_once(lockres); | |
704 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_QINFO, info->dqi_gi.dqi_type, | |
705 | 0, lockres->l_name); | |
706 | ocfs2_lock_res_init_common(OCFS2_SB(info->dqi_gi.dqi_sb), lockres, | |
707 | OCFS2_LOCK_TYPE_QINFO, &ocfs2_qinfo_lops, | |
708 | info); | |
709 | } | |
710 | ||
8dec98ed TM |
711 | void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res *lockres, |
712 | struct ocfs2_super *osb, u64 ref_blkno, | |
713 | unsigned int generation) | |
714 | { | |
715 | ocfs2_lock_res_init_once(lockres); | |
716 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_REFCOUNT, ref_blkno, | |
717 | generation, lockres->l_name); | |
718 | ocfs2_lock_res_init_common(osb, lockres, OCFS2_LOCK_TYPE_REFCOUNT, | |
719 | &ocfs2_refcount_block_lops, osb); | |
720 | } | |
721 | ||
ccd979bd MF |
722 | void ocfs2_lock_res_free(struct ocfs2_lock_res *res) |
723 | { | |
ccd979bd MF |
724 | if (!(res->l_flags & OCFS2_LOCK_INITIALIZED)) |
725 | return; | |
726 | ||
727 | ocfs2_remove_lockres_tracking(res); | |
728 | ||
729 | mlog_bug_on_msg(!list_empty(&res->l_blocked_list), | |
730 | "Lockres %s is on the blocked list\n", | |
731 | res->l_name); | |
732 | mlog_bug_on_msg(!list_empty(&res->l_mask_waiters), | |
733 | "Lockres %s has mask waiters pending\n", | |
734 | res->l_name); | |
735 | mlog_bug_on_msg(spin_is_locked(&res->l_lock), | |
736 | "Lockres %s is locked\n", | |
737 | res->l_name); | |
738 | mlog_bug_on_msg(res->l_ro_holders, | |
739 | "Lockres %s has %u ro holders\n", | |
740 | res->l_name, res->l_ro_holders); | |
741 | mlog_bug_on_msg(res->l_ex_holders, | |
742 | "Lockres %s has %u ex holders\n", | |
743 | res->l_name, res->l_ex_holders); | |
744 | ||
745 | /* Need to clear out the lock status block for the dlm */ | |
746 | memset(&res->l_lksb, 0, sizeof(res->l_lksb)); | |
747 | ||
748 | res->l_flags = 0UL; | |
ccd979bd MF |
749 | } |
750 | ||
751 | static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres, | |
752 | int level) | |
753 | { | |
ccd979bd MF |
754 | BUG_ON(!lockres); |
755 | ||
756 | switch(level) { | |
bd3e7610 | 757 | case DLM_LOCK_EX: |
ccd979bd MF |
758 | lockres->l_ex_holders++; |
759 | break; | |
bd3e7610 | 760 | case DLM_LOCK_PR: |
ccd979bd MF |
761 | lockres->l_ro_holders++; |
762 | break; | |
763 | default: | |
764 | BUG(); | |
765 | } | |
ccd979bd MF |
766 | } |
767 | ||
768 | static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres, | |
769 | int level) | |
770 | { | |
ccd979bd MF |
771 | BUG_ON(!lockres); |
772 | ||
773 | switch(level) { | |
bd3e7610 | 774 | case DLM_LOCK_EX: |
ccd979bd MF |
775 | BUG_ON(!lockres->l_ex_holders); |
776 | lockres->l_ex_holders--; | |
777 | break; | |
bd3e7610 | 778 | case DLM_LOCK_PR: |
ccd979bd MF |
779 | BUG_ON(!lockres->l_ro_holders); |
780 | lockres->l_ro_holders--; | |
781 | break; | |
782 | default: | |
783 | BUG(); | |
784 | } | |
ccd979bd MF |
785 | } |
786 | ||
787 | /* WARNING: This function lives in a world where the only three lock | |
788 | * levels are EX, PR, and NL. It *will* have to be adjusted when more | |
789 | * lock types are added. */ | |
790 | static inline int ocfs2_highest_compat_lock_level(int level) | |
791 | { | |
bd3e7610 | 792 | int new_level = DLM_LOCK_EX; |
ccd979bd | 793 | |
bd3e7610 JB |
794 | if (level == DLM_LOCK_EX) |
795 | new_level = DLM_LOCK_NL; | |
796 | else if (level == DLM_LOCK_PR) | |
797 | new_level = DLM_LOCK_PR; | |
ccd979bd MF |
798 | return new_level; |
799 | } | |
800 | ||
801 | static void lockres_set_flags(struct ocfs2_lock_res *lockres, | |
802 | unsigned long newflags) | |
803 | { | |
800deef3 | 804 | struct ocfs2_mask_waiter *mw, *tmp; |
ccd979bd MF |
805 | |
806 | assert_spin_locked(&lockres->l_lock); | |
807 | ||
808 | lockres->l_flags = newflags; | |
809 | ||
800deef3 | 810 | list_for_each_entry_safe(mw, tmp, &lockres->l_mask_waiters, mw_item) { |
ccd979bd MF |
811 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) |
812 | continue; | |
813 | ||
814 | list_del_init(&mw->mw_item); | |
815 | mw->mw_status = 0; | |
816 | complete(&mw->mw_complete); | |
817 | } | |
818 | } | |
819 | static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or) | |
820 | { | |
821 | lockres_set_flags(lockres, lockres->l_flags | or); | |
822 | } | |
823 | static void lockres_clear_flags(struct ocfs2_lock_res *lockres, | |
824 | unsigned long clear) | |
825 | { | |
826 | lockres_set_flags(lockres, lockres->l_flags & ~clear); | |
827 | } | |
828 | ||
829 | static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres) | |
830 | { | |
ccd979bd MF |
831 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); |
832 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); | |
833 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
bd3e7610 | 834 | BUG_ON(lockres->l_blocking <= DLM_LOCK_NL); |
ccd979bd MF |
835 | |
836 | lockres->l_level = lockres->l_requested; | |
837 | if (lockres->l_level <= | |
838 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) { | |
bd3e7610 | 839 | lockres->l_blocking = DLM_LOCK_NL; |
ccd979bd MF |
840 | lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED); |
841 | } | |
842 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
ccd979bd MF |
843 | } |
844 | ||
845 | static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres) | |
846 | { | |
ccd979bd MF |
847 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); |
848 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); | |
849 | ||
850 | /* Convert from RO to EX doesn't really need anything as our | |
851 | * information is already up to data. Convert from NL to | |
852 | * *anything* however should mark ourselves as needing an | |
853 | * update */ | |
bd3e7610 | 854 | if (lockres->l_level == DLM_LOCK_NL && |
f625c979 | 855 | lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) |
ccd979bd MF |
856 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
857 | ||
858 | lockres->l_level = lockres->l_requested; | |
a1912826 SM |
859 | |
860 | /* | |
861 | * We set the OCFS2_LOCK_UPCONVERT_FINISHING flag before clearing | |
862 | * the OCFS2_LOCK_BUSY flag to prevent the dc thread from | |
863 | * downconverting the lock before the upconvert has fully completed. | |
d1e78238 X |
864 | * Do not prevent the dc thread from downconverting if NONBLOCK lock |
865 | * had already returned. | |
a1912826 | 866 | */ |
d1e78238 X |
867 | if (!(lockres->l_flags & OCFS2_LOCK_NONBLOCK_FINISHED)) |
868 | lockres_or_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING); | |
869 | else | |
870 | lockres_clear_flags(lockres, OCFS2_LOCK_NONBLOCK_FINISHED); | |
a1912826 | 871 | |
ccd979bd | 872 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); |
ccd979bd MF |
873 | } |
874 | ||
875 | static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres) | |
876 | { | |
3cf0c507 | 877 | BUG_ON((!(lockres->l_flags & OCFS2_LOCK_BUSY))); |
ccd979bd MF |
878 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); |
879 | ||
bd3e7610 | 880 | if (lockres->l_requested > DLM_LOCK_NL && |
f625c979 MF |
881 | !(lockres->l_flags & OCFS2_LOCK_LOCAL) && |
882 | lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) | |
ccd979bd MF |
883 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
884 | ||
885 | lockres->l_level = lockres->l_requested; | |
886 | lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED); | |
887 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
ccd979bd MF |
888 | } |
889 | ||
ccd979bd MF |
890 | static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, |
891 | int level) | |
892 | { | |
893 | int needs_downconvert = 0; | |
ccd979bd MF |
894 | |
895 | assert_spin_locked(&lockres->l_lock); | |
896 | ||
ccd979bd MF |
897 | if (level > lockres->l_blocking) { |
898 | /* only schedule a downconvert if we haven't already scheduled | |
899 | * one that goes low enough to satisfy the level we're | |
900 | * blocking. this also catches the case where we get | |
901 | * duplicate BASTs */ | |
902 | if (ocfs2_highest_compat_lock_level(level) < | |
903 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) | |
904 | needs_downconvert = 1; | |
905 | ||
906 | lockres->l_blocking = level; | |
907 | } | |
908 | ||
9b915181 SM |
909 | mlog(ML_BASTS, "lockres %s, block %d, level %d, l_block %d, dwn %d\n", |
910 | lockres->l_name, level, lockres->l_level, lockres->l_blocking, | |
911 | needs_downconvert); | |
912 | ||
0b94a909 WW |
913 | if (needs_downconvert) |
914 | lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); | |
c1e8d35e | 915 | mlog(0, "needs_downconvert = %d\n", needs_downconvert); |
ccd979bd MF |
916 | return needs_downconvert; |
917 | } | |
918 | ||
de551246 JB |
919 | /* |
920 | * OCFS2_LOCK_PENDING and l_pending_gen. | |
921 | * | |
922 | * Why does OCFS2_LOCK_PENDING exist? To close a race between setting | |
923 | * OCFS2_LOCK_BUSY and calling ocfs2_dlm_lock(). See ocfs2_unblock_lock() | |
924 | * for more details on the race. | |
925 | * | |
926 | * OCFS2_LOCK_PENDING closes the race quite nicely. However, it introduces | |
927 | * a race on itself. In o2dlm, we can get the ast before ocfs2_dlm_lock() | |
928 | * returns. The ast clears OCFS2_LOCK_BUSY, and must therefore clear | |
929 | * OCFS2_LOCK_PENDING at the same time. When ocfs2_dlm_lock() returns, | |
930 | * the caller is going to try to clear PENDING again. If nothing else is | |
931 | * happening, __lockres_clear_pending() sees PENDING is unset and does | |
932 | * nothing. | |
933 | * | |
934 | * But what if another path (eg downconvert thread) has just started a | |
935 | * new locking action? The other path has re-set PENDING. Our path | |
936 | * cannot clear PENDING, because that will re-open the original race | |
937 | * window. | |
938 | * | |
939 | * [Example] | |
940 | * | |
941 | * ocfs2_meta_lock() | |
942 | * ocfs2_cluster_lock() | |
943 | * set BUSY | |
944 | * set PENDING | |
945 | * drop l_lock | |
946 | * ocfs2_dlm_lock() | |
947 | * ocfs2_locking_ast() ocfs2_downconvert_thread() | |
948 | * clear PENDING ocfs2_unblock_lock() | |
949 | * take_l_lock | |
950 | * !BUSY | |
951 | * ocfs2_prepare_downconvert() | |
952 | * set BUSY | |
953 | * set PENDING | |
954 | * drop l_lock | |
955 | * take l_lock | |
956 | * clear PENDING | |
957 | * drop l_lock | |
958 | * <window> | |
959 | * ocfs2_dlm_lock() | |
960 | * | |
961 | * So as you can see, we now have a window where l_lock is not held, | |
962 | * PENDING is not set, and ocfs2_dlm_lock() has not been called. | |
963 | * | |
964 | * The core problem is that ocfs2_cluster_lock() has cleared the PENDING | |
965 | * set by ocfs2_prepare_downconvert(). That wasn't nice. | |
966 | * | |
967 | * To solve this we introduce l_pending_gen. A call to | |
968 | * lockres_clear_pending() will only do so when it is passed a generation | |
969 | * number that matches the lockres. lockres_set_pending() will return the | |
970 | * current generation number. When ocfs2_cluster_lock() goes to clear | |
971 | * PENDING, it passes the generation it got from set_pending(). In our | |
972 | * example above, the generation numbers will *not* match. Thus, | |
973 | * ocfs2_cluster_lock() will not clear the PENDING set by | |
974 | * ocfs2_prepare_downconvert(). | |
975 | */ | |
976 | ||
977 | /* Unlocked version for ocfs2_locking_ast() */ | |
978 | static void __lockres_clear_pending(struct ocfs2_lock_res *lockres, | |
979 | unsigned int generation, | |
980 | struct ocfs2_super *osb) | |
981 | { | |
982 | assert_spin_locked(&lockres->l_lock); | |
983 | ||
984 | /* | |
985 | * The ast and locking functions can race us here. The winner | |
986 | * will clear pending, the loser will not. | |
987 | */ | |
988 | if (!(lockres->l_flags & OCFS2_LOCK_PENDING) || | |
989 | (lockres->l_pending_gen != generation)) | |
990 | return; | |
991 | ||
992 | lockres_clear_flags(lockres, OCFS2_LOCK_PENDING); | |
993 | lockres->l_pending_gen++; | |
994 | ||
995 | /* | |
996 | * The downconvert thread may have skipped us because we | |
997 | * were PENDING. Wake it up. | |
998 | */ | |
999 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) | |
1000 | ocfs2_wake_downconvert_thread(osb); | |
1001 | } | |
1002 | ||
1003 | /* Locked version for callers of ocfs2_dlm_lock() */ | |
1004 | static void lockres_clear_pending(struct ocfs2_lock_res *lockres, | |
1005 | unsigned int generation, | |
1006 | struct ocfs2_super *osb) | |
1007 | { | |
1008 | unsigned long flags; | |
1009 | ||
1010 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1011 | __lockres_clear_pending(lockres, generation, osb); | |
1012 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1013 | } | |
1014 | ||
1015 | static unsigned int lockres_set_pending(struct ocfs2_lock_res *lockres) | |
1016 | { | |
1017 | assert_spin_locked(&lockres->l_lock); | |
1018 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); | |
1019 | ||
1020 | lockres_or_flags(lockres, OCFS2_LOCK_PENDING); | |
1021 | ||
1022 | return lockres->l_pending_gen; | |
1023 | } | |
1024 | ||
c0e41338 | 1025 | static void ocfs2_blocking_ast(struct ocfs2_dlm_lksb *lksb, int level) |
ccd979bd | 1026 | { |
a796d286 | 1027 | struct ocfs2_lock_res *lockres = ocfs2_lksb_to_lock_res(lksb); |
aa2623ad | 1028 | struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); |
ccd979bd MF |
1029 | int needs_downconvert; |
1030 | unsigned long flags; | |
1031 | ||
bd3e7610 | 1032 | BUG_ON(level <= DLM_LOCK_NL); |
ccd979bd | 1033 | |
9b915181 SM |
1034 | mlog(ML_BASTS, "BAST fired for lockres %s, blocking %d, level %d, " |
1035 | "type %s\n", lockres->l_name, level, lockres->l_level, | |
aa2623ad MF |
1036 | ocfs2_lock_type_string(lockres->l_type)); |
1037 | ||
cf8e06f1 MF |
1038 | /* |
1039 | * We can skip the bast for locks which don't enable caching - | |
1040 | * they'll be dropped at the earliest possible time anyway. | |
1041 | */ | |
1042 | if (lockres->l_flags & OCFS2_LOCK_NOCACHE) | |
1043 | return; | |
1044 | ||
ccd979bd MF |
1045 | spin_lock_irqsave(&lockres->l_lock, flags); |
1046 | needs_downconvert = ocfs2_generic_handle_bast(lockres, level); | |
1047 | if (needs_downconvert) | |
1048 | ocfs2_schedule_blocked_lock(osb, lockres); | |
1049 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1050 | ||
d680efe9 MF |
1051 | wake_up(&lockres->l_event); |
1052 | ||
34d024f8 | 1053 | ocfs2_wake_downconvert_thread(osb); |
ccd979bd MF |
1054 | } |
1055 | ||
c0e41338 | 1056 | static void ocfs2_locking_ast(struct ocfs2_dlm_lksb *lksb) |
ccd979bd | 1057 | { |
a796d286 | 1058 | struct ocfs2_lock_res *lockres = ocfs2_lksb_to_lock_res(lksb); |
de551246 | 1059 | struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); |
ccd979bd | 1060 | unsigned long flags; |
1693a5c0 | 1061 | int status; |
ccd979bd MF |
1062 | |
1063 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1064 | ||
1693a5c0 DT |
1065 | status = ocfs2_dlm_lock_status(&lockres->l_lksb); |
1066 | ||
1067 | if (status == -EAGAIN) { | |
1068 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
1069 | goto out; | |
1070 | } | |
1071 | ||
1072 | if (status) { | |
8f2c9c1b | 1073 | mlog(ML_ERROR, "lockres %s: lksb status value of %d!\n", |
1693a5c0 | 1074 | lockres->l_name, status); |
ccd979bd MF |
1075 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1076 | return; | |
1077 | } | |
1078 | ||
9b915181 SM |
1079 | mlog(ML_BASTS, "AST fired for lockres %s, action %d, unlock %d, " |
1080 | "level %d => %d\n", lockres->l_name, lockres->l_action, | |
1081 | lockres->l_unlock_action, lockres->l_level, lockres->l_requested); | |
1082 | ||
ccd979bd MF |
1083 | switch(lockres->l_action) { |
1084 | case OCFS2_AST_ATTACH: | |
1085 | ocfs2_generic_handle_attach_action(lockres); | |
e92d57df | 1086 | lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL); |
ccd979bd MF |
1087 | break; |
1088 | case OCFS2_AST_CONVERT: | |
1089 | ocfs2_generic_handle_convert_action(lockres); | |
1090 | break; | |
1091 | case OCFS2_AST_DOWNCONVERT: | |
1092 | ocfs2_generic_handle_downconvert_action(lockres); | |
1093 | break; | |
1094 | default: | |
9b915181 SM |
1095 | mlog(ML_ERROR, "lockres %s: AST fired with invalid action: %u, " |
1096 | "flags 0x%lx, unlock: %u\n", | |
e92d57df MF |
1097 | lockres->l_name, lockres->l_action, lockres->l_flags, |
1098 | lockres->l_unlock_action); | |
ccd979bd MF |
1099 | BUG(); |
1100 | } | |
1693a5c0 | 1101 | out: |
ccd979bd MF |
1102 | /* set it to something invalid so if we get called again we |
1103 | * can catch it. */ | |
1104 | lockres->l_action = OCFS2_AST_INVALID; | |
ccd979bd | 1105 | |
de551246 JB |
1106 | /* Did we try to cancel this lock? Clear that state */ |
1107 | if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) | |
1108 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
1109 | ||
1110 | /* | |
1111 | * We may have beaten the locking functions here. We certainly | |
1112 | * know that dlm_lock() has been called :-) | |
1113 | * Because we can't have two lock calls in flight at once, we | |
1114 | * can use lockres->l_pending_gen. | |
1115 | */ | |
1116 | __lockres_clear_pending(lockres, lockres->l_pending_gen, osb); | |
1117 | ||
ccd979bd | 1118 | wake_up(&lockres->l_event); |
d680efe9 | 1119 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
ccd979bd MF |
1120 | } |
1121 | ||
553b5eb9 JB |
1122 | static void ocfs2_unlock_ast(struct ocfs2_dlm_lksb *lksb, int error) |
1123 | { | |
1124 | struct ocfs2_lock_res *lockres = ocfs2_lksb_to_lock_res(lksb); | |
1125 | unsigned long flags; | |
1126 | ||
9b915181 SM |
1127 | mlog(ML_BASTS, "UNLOCK AST fired for lockres %s, action = %d\n", |
1128 | lockres->l_name, lockres->l_unlock_action); | |
553b5eb9 JB |
1129 | |
1130 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1131 | if (error) { | |
1132 | mlog(ML_ERROR, "Dlm passes error %d for lock %s, " | |
1133 | "unlock_action %d\n", error, lockres->l_name, | |
1134 | lockres->l_unlock_action); | |
1135 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
553b5eb9 JB |
1136 | return; |
1137 | } | |
1138 | ||
1139 | switch(lockres->l_unlock_action) { | |
1140 | case OCFS2_UNLOCK_CANCEL_CONVERT: | |
1141 | mlog(0, "Cancel convert success for %s\n", lockres->l_name); | |
1142 | lockres->l_action = OCFS2_AST_INVALID; | |
1143 | /* Downconvert thread may have requeued this lock, we | |
1144 | * need to wake it. */ | |
1145 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) | |
1146 | ocfs2_wake_downconvert_thread(ocfs2_get_lockres_osb(lockres)); | |
1147 | break; | |
1148 | case OCFS2_UNLOCK_DROP_LOCK: | |
1149 | lockres->l_level = DLM_LOCK_IV; | |
1150 | break; | |
1151 | default: | |
1152 | BUG(); | |
1153 | } | |
1154 | ||
1155 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
1156 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
1157 | wake_up(&lockres->l_event); | |
1158 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
553b5eb9 JB |
1159 | } |
1160 | ||
1161 | /* | |
1162 | * This is the filesystem locking protocol. It provides the lock handling | |
1163 | * hooks for the underlying DLM. It has a maximum version number. | |
1164 | * The version number allows interoperability with systems running at | |
1165 | * the same major number and an equal or smaller minor number. | |
1166 | * | |
1167 | * Whenever the filesystem does new things with locks (adds or removes a | |
1168 | * lock, orders them differently, does different things underneath a lock), | |
1169 | * the version must be changed. The protocol is negotiated when joining | |
1170 | * the dlm domain. A node may join the domain if its major version is | |
1171 | * identical to all other nodes and its minor version is greater than | |
1172 | * or equal to all other nodes. When its minor version is greater than | |
1173 | * the other nodes, it will run at the minor version specified by the | |
1174 | * other nodes. | |
1175 | * | |
1176 | * If a locking change is made that will not be compatible with older | |
1177 | * versions, the major number must be increased and the minor version set | |
1178 | * to zero. If a change merely adds a behavior that can be disabled when | |
1179 | * speaking to older versions, the minor version must be increased. If a | |
1180 | * change adds a fully backwards compatible change (eg, LVB changes that | |
1181 | * are just ignored by older versions), the version does not need to be | |
1182 | * updated. | |
1183 | */ | |
1184 | static struct ocfs2_locking_protocol lproto = { | |
1185 | .lp_max_version = { | |
1186 | .pv_major = OCFS2_LOCKING_PROTOCOL_MAJOR, | |
1187 | .pv_minor = OCFS2_LOCKING_PROTOCOL_MINOR, | |
1188 | }, | |
1189 | .lp_lock_ast = ocfs2_locking_ast, | |
1190 | .lp_blocking_ast = ocfs2_blocking_ast, | |
1191 | .lp_unlock_ast = ocfs2_unlock_ast, | |
1192 | }; | |
1193 | ||
1194 | void ocfs2_set_locking_protocol(void) | |
1195 | { | |
1196 | ocfs2_stack_glue_set_max_proto_version(&lproto.lp_max_version); | |
1197 | } | |
1198 | ||
ccd979bd MF |
1199 | static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, |
1200 | int convert) | |
1201 | { | |
1202 | unsigned long flags; | |
1203 | ||
ccd979bd MF |
1204 | spin_lock_irqsave(&lockres->l_lock, flags); |
1205 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
a1912826 | 1206 | lockres_clear_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING); |
ccd979bd MF |
1207 | if (convert) |
1208 | lockres->l_action = OCFS2_AST_INVALID; | |
1209 | else | |
1210 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
1211 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1212 | ||
1213 | wake_up(&lockres->l_event); | |
ccd979bd MF |
1214 | } |
1215 | ||
1216 | /* Note: If we detect another process working on the lock (i.e., | |
1217 | * OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller | |
1218 | * to do the right thing in that case. | |
1219 | */ | |
1220 | static int ocfs2_lock_create(struct ocfs2_super *osb, | |
1221 | struct ocfs2_lock_res *lockres, | |
1222 | int level, | |
bd3e7610 | 1223 | u32 dlm_flags) |
ccd979bd MF |
1224 | { |
1225 | int ret = 0; | |
ccd979bd | 1226 | unsigned long flags; |
de551246 | 1227 | unsigned int gen; |
ccd979bd | 1228 | |
bd3e7610 | 1229 | mlog(0, "lock %s, level = %d, flags = %u\n", lockres->l_name, level, |
ccd979bd MF |
1230 | dlm_flags); |
1231 | ||
1232 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1233 | if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) || | |
1234 | (lockres->l_flags & OCFS2_LOCK_BUSY)) { | |
1235 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1236 | goto bail; | |
1237 | } | |
1238 | ||
1239 | lockres->l_action = OCFS2_AST_ATTACH; | |
1240 | lockres->l_requested = level; | |
1241 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
de551246 | 1242 | gen = lockres_set_pending(lockres); |
ccd979bd MF |
1243 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1244 | ||
4670c46d | 1245 | ret = ocfs2_dlm_lock(osb->cconn, |
7431cd7e JB |
1246 | level, |
1247 | &lockres->l_lksb, | |
1248 | dlm_flags, | |
1249 | lockres->l_name, | |
a796d286 | 1250 | OCFS2_LOCK_ID_MAX_LEN - 1); |
de551246 | 1251 | lockres_clear_pending(lockres, gen, osb); |
7431cd7e JB |
1252 | if (ret) { |
1253 | ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres); | |
ccd979bd MF |
1254 | ocfs2_recover_from_dlm_error(lockres, 1); |
1255 | } | |
1256 | ||
7431cd7e | 1257 | mlog(0, "lock %s, return from ocfs2_dlm_lock\n", lockres->l_name); |
ccd979bd MF |
1258 | |
1259 | bail: | |
ccd979bd MF |
1260 | return ret; |
1261 | } | |
1262 | ||
1263 | static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres, | |
1264 | int flag) | |
1265 | { | |
1266 | unsigned long flags; | |
1267 | int ret; | |
1268 | ||
1269 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1270 | ret = lockres->l_flags & flag; | |
1271 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1272 | ||
1273 | return ret; | |
1274 | } | |
1275 | ||
1276 | static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres) | |
1277 | ||
1278 | { | |
1279 | wait_event(lockres->l_event, | |
1280 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY)); | |
1281 | } | |
1282 | ||
1283 | static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres) | |
1284 | ||
1285 | { | |
1286 | wait_event(lockres->l_event, | |
1287 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING)); | |
1288 | } | |
1289 | ||
1290 | /* predict what lock level we'll be dropping down to on behalf | |
1291 | * of another node, and return true if the currently wanted | |
1292 | * level will be compatible with it. */ | |
1293 | static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, | |
1294 | int wanted) | |
1295 | { | |
1296 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
1297 | ||
1298 | return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking); | |
1299 | } | |
1300 | ||
1301 | static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw) | |
1302 | { | |
1303 | INIT_LIST_HEAD(&mw->mw_item); | |
1304 | init_completion(&mw->mw_complete); | |
8ddb7b00 | 1305 | ocfs2_init_start_time(mw); |
ccd979bd MF |
1306 | } |
1307 | ||
1308 | static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw) | |
1309 | { | |
1310 | wait_for_completion(&mw->mw_complete); | |
1311 | /* Re-arm the completion in case we want to wait on it again */ | |
16735d02 | 1312 | reinit_completion(&mw->mw_complete); |
ccd979bd MF |
1313 | return mw->mw_status; |
1314 | } | |
1315 | ||
1316 | static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres, | |
1317 | struct ocfs2_mask_waiter *mw, | |
1318 | unsigned long mask, | |
1319 | unsigned long goal) | |
1320 | { | |
1321 | BUG_ON(!list_empty(&mw->mw_item)); | |
1322 | ||
1323 | assert_spin_locked(&lockres->l_lock); | |
1324 | ||
1325 | list_add_tail(&mw->mw_item, &lockres->l_mask_waiters); | |
1326 | mw->mw_mask = mask; | |
1327 | mw->mw_goal = goal; | |
1328 | } | |
1329 | ||
1330 | /* returns 0 if the mw that was removed was already satisfied, -EBUSY | |
1331 | * if the mask still hadn't reached its goal */ | |
d1e78238 | 1332 | static int __lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres, |
ccd979bd MF |
1333 | struct ocfs2_mask_waiter *mw) |
1334 | { | |
ccd979bd MF |
1335 | int ret = 0; |
1336 | ||
d1e78238 | 1337 | assert_spin_locked(&lockres->l_lock); |
ccd979bd MF |
1338 | if (!list_empty(&mw->mw_item)) { |
1339 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) | |
1340 | ret = -EBUSY; | |
1341 | ||
1342 | list_del_init(&mw->mw_item); | |
1343 | init_completion(&mw->mw_complete); | |
1344 | } | |
d1e78238 X |
1345 | |
1346 | return ret; | |
1347 | } | |
1348 | ||
1349 | static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres, | |
1350 | struct ocfs2_mask_waiter *mw) | |
1351 | { | |
1352 | unsigned long flags; | |
1353 | int ret = 0; | |
1354 | ||
1355 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1356 | ret = __lockres_remove_mask_waiter(lockres, mw); | |
ccd979bd MF |
1357 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1358 | ||
1359 | return ret; | |
1360 | ||
1361 | } | |
1362 | ||
cf8e06f1 MF |
1363 | static int ocfs2_wait_for_mask_interruptible(struct ocfs2_mask_waiter *mw, |
1364 | struct ocfs2_lock_res *lockres) | |
1365 | { | |
1366 | int ret; | |
1367 | ||
1368 | ret = wait_for_completion_interruptible(&mw->mw_complete); | |
1369 | if (ret) | |
1370 | lockres_remove_mask_waiter(lockres, mw); | |
1371 | else | |
1372 | ret = mw->mw_status; | |
1373 | /* Re-arm the completion in case we want to wait on it again */ | |
16735d02 | 1374 | reinit_completion(&mw->mw_complete); |
cf8e06f1 MF |
1375 | return ret; |
1376 | } | |
1377 | ||
cb25797d JK |
1378 | static int __ocfs2_cluster_lock(struct ocfs2_super *osb, |
1379 | struct ocfs2_lock_res *lockres, | |
1380 | int level, | |
1381 | u32 lkm_flags, | |
1382 | int arg_flags, | |
1383 | int l_subclass, | |
1384 | unsigned long caller_ip) | |
ccd979bd MF |
1385 | { |
1386 | struct ocfs2_mask_waiter mw; | |
ccd979bd MF |
1387 | int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR); |
1388 | int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */ | |
1389 | unsigned long flags; | |
de551246 | 1390 | unsigned int gen; |
1693a5c0 | 1391 | int noqueue_attempted = 0; |
d1e78238 | 1392 | int dlm_locked = 0; |
b1b1e15e | 1393 | int kick_dc = 0; |
ccd979bd | 1394 | |
2f2eca20 | 1395 | if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) { |
1396 | mlog_errno(-EINVAL); | |
1397 | return -EINVAL; | |
1398 | } | |
1399 | ||
ccd979bd MF |
1400 | ocfs2_init_mask_waiter(&mw); |
1401 | ||
b80fc012 | 1402 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
bd3e7610 | 1403 | lkm_flags |= DLM_LKF_VALBLK; |
b80fc012 | 1404 | |
ccd979bd MF |
1405 | again: |
1406 | wait = 0; | |
1407 | ||
a1912826 SM |
1408 | spin_lock_irqsave(&lockres->l_lock, flags); |
1409 | ||
ccd979bd MF |
1410 | if (catch_signals && signal_pending(current)) { |
1411 | ret = -ERESTARTSYS; | |
a1912826 | 1412 | goto unlock; |
ccd979bd MF |
1413 | } |
1414 | ||
ccd979bd MF |
1415 | mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING, |
1416 | "Cluster lock called on freeing lockres %s! flags " | |
1417 | "0x%lx\n", lockres->l_name, lockres->l_flags); | |
1418 | ||
1419 | /* We only compare against the currently granted level | |
1420 | * here. If the lock is blocked waiting on a downconvert, | |
1421 | * we'll get caught below. */ | |
1422 | if (lockres->l_flags & OCFS2_LOCK_BUSY && | |
1423 | level > lockres->l_level) { | |
1424 | /* is someone sitting in dlm_lock? If so, wait on | |
1425 | * them. */ | |
1426 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
1427 | wait = 1; | |
1428 | goto unlock; | |
1429 | } | |
1430 | ||
a1912826 SM |
1431 | if (lockres->l_flags & OCFS2_LOCK_UPCONVERT_FINISHING) { |
1432 | /* | |
1433 | * We've upconverted. If the lock now has a level we can | |
1434 | * work with, we take it. If, however, the lock is not at the | |
1435 | * required level, we go thru the full cycle. One way this could | |
1436 | * happen is if a process requesting an upconvert to PR is | |
1437 | * closely followed by another requesting upconvert to an EX. | |
1438 | * If the process requesting EX lands here, we want it to | |
1439 | * continue attempting to upconvert and let the process | |
1440 | * requesting PR take the lock. | |
1441 | * If multiple processes request upconvert to PR, the first one | |
1442 | * here will take the lock. The others will have to go thru the | |
1443 | * OCFS2_LOCK_BLOCKED check to ensure that there is no pending | |
1444 | * downconvert request. | |
1445 | */ | |
1446 | if (level <= lockres->l_level) | |
1447 | goto update_holders; | |
1448 | } | |
1449 | ||
ccd979bd MF |
1450 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED && |
1451 | !ocfs2_may_continue_on_blocked_lock(lockres, level)) { | |
1452 | /* is the lock is currently blocked on behalf of | |
1453 | * another node */ | |
1454 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0); | |
1455 | wait = 1; | |
1456 | goto unlock; | |
1457 | } | |
1458 | ||
1459 | if (level > lockres->l_level) { | |
1693a5c0 DT |
1460 | if (noqueue_attempted > 0) { |
1461 | ret = -EAGAIN; | |
1462 | goto unlock; | |
1463 | } | |
1464 | if (lkm_flags & DLM_LKF_NOQUEUE) | |
1465 | noqueue_attempted = 1; | |
1466 | ||
ccd979bd MF |
1467 | if (lockres->l_action != OCFS2_AST_INVALID) |
1468 | mlog(ML_ERROR, "lockres %s has action %u pending\n", | |
1469 | lockres->l_name, lockres->l_action); | |
1470 | ||
019d1b22 MF |
1471 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { |
1472 | lockres->l_action = OCFS2_AST_ATTACH; | |
bd3e7610 | 1473 | lkm_flags &= ~DLM_LKF_CONVERT; |
019d1b22 MF |
1474 | } else { |
1475 | lockres->l_action = OCFS2_AST_CONVERT; | |
bd3e7610 | 1476 | lkm_flags |= DLM_LKF_CONVERT; |
019d1b22 MF |
1477 | } |
1478 | ||
ccd979bd MF |
1479 | lockres->l_requested = level; |
1480 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
de551246 | 1481 | gen = lockres_set_pending(lockres); |
ccd979bd MF |
1482 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1483 | ||
bd3e7610 JB |
1484 | BUG_ON(level == DLM_LOCK_IV); |
1485 | BUG_ON(level == DLM_LOCK_NL); | |
ccd979bd | 1486 | |
9b915181 | 1487 | mlog(ML_BASTS, "lockres %s, convert from %d to %d\n", |
ccd979bd MF |
1488 | lockres->l_name, lockres->l_level, level); |
1489 | ||
1490 | /* call dlm_lock to upgrade lock now */ | |
4670c46d | 1491 | ret = ocfs2_dlm_lock(osb->cconn, |
7431cd7e JB |
1492 | level, |
1493 | &lockres->l_lksb, | |
1494 | lkm_flags, | |
1495 | lockres->l_name, | |
a796d286 | 1496 | OCFS2_LOCK_ID_MAX_LEN - 1); |
de551246 | 1497 | lockres_clear_pending(lockres, gen, osb); |
7431cd7e JB |
1498 | if (ret) { |
1499 | if (!(lkm_flags & DLM_LKF_NOQUEUE) || | |
1500 | (ret != -EAGAIN)) { | |
24ef1815 | 1501 | ocfs2_log_dlm_error("ocfs2_dlm_lock", |
7431cd7e | 1502 | ret, lockres); |
ccd979bd MF |
1503 | } |
1504 | ocfs2_recover_from_dlm_error(lockres, 1); | |
1505 | goto out; | |
1506 | } | |
d1e78238 | 1507 | dlm_locked = 1; |
ccd979bd | 1508 | |
73ac36ea | 1509 | mlog(0, "lock %s, successful return from ocfs2_dlm_lock\n", |
ccd979bd MF |
1510 | lockres->l_name); |
1511 | ||
1512 | /* At this point we've gone inside the dlm and need to | |
1513 | * complete our work regardless. */ | |
1514 | catch_signals = 0; | |
1515 | ||
1516 | /* wait for busy to clear and carry on */ | |
1517 | goto again; | |
1518 | } | |
1519 | ||
a1912826 | 1520 | update_holders: |
ccd979bd MF |
1521 | /* Ok, if we get here then we're good to go. */ |
1522 | ocfs2_inc_holders(lockres, level); | |
1523 | ||
1524 | ret = 0; | |
1525 | unlock: | |
a1912826 SM |
1526 | lockres_clear_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING); |
1527 | ||
b1b1e15e TS |
1528 | /* ocfs2_unblock_lock reques on seeing OCFS2_LOCK_UPCONVERT_FINISHING */ |
1529 | kick_dc = (lockres->l_flags & OCFS2_LOCK_BLOCKED); | |
1530 | ||
ccd979bd | 1531 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
b1b1e15e TS |
1532 | if (kick_dc) |
1533 | ocfs2_wake_downconvert_thread(osb); | |
ccd979bd MF |
1534 | out: |
1535 | /* | |
1536 | * This is helping work around a lock inversion between the page lock | |
1537 | * and dlm locks. One path holds the page lock while calling aops | |
1538 | * which block acquiring dlm locks. The voting thread holds dlm | |
1539 | * locks while acquiring page locks while down converting data locks. | |
1540 | * This block is helping an aop path notice the inversion and back | |
1541 | * off to unlock its page lock before trying the dlm lock again. | |
1542 | */ | |
1543 | if (wait && arg_flags & OCFS2_LOCK_NONBLOCK && | |
1544 | mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) { | |
1545 | wait = 0; | |
d1e78238 X |
1546 | spin_lock_irqsave(&lockres->l_lock, flags); |
1547 | if (__lockres_remove_mask_waiter(lockres, &mw)) { | |
1548 | if (dlm_locked) | |
1549 | lockres_or_flags(lockres, | |
1550 | OCFS2_LOCK_NONBLOCK_FINISHED); | |
1551 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
ccd979bd | 1552 | ret = -EAGAIN; |
d1e78238 X |
1553 | } else { |
1554 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
ccd979bd | 1555 | goto again; |
d1e78238 | 1556 | } |
ccd979bd MF |
1557 | } |
1558 | if (wait) { | |
1559 | ret = ocfs2_wait_for_mask(&mw); | |
1560 | if (ret == 0) | |
1561 | goto again; | |
1562 | mlog_errno(ret); | |
1563 | } | |
8ddb7b00 | 1564 | ocfs2_update_lock_stats(lockres, level, &mw, ret); |
ccd979bd | 1565 | |
cb25797d JK |
1566 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1567 | if (!ret && lockres->l_lockdep_map.key != NULL) { | |
1568 | if (level == DLM_LOCK_PR) | |
1569 | rwsem_acquire_read(&lockres->l_lockdep_map, l_subclass, | |
1570 | !!(arg_flags & OCFS2_META_LOCK_NOQUEUE), | |
1571 | caller_ip); | |
1572 | else | |
1573 | rwsem_acquire(&lockres->l_lockdep_map, l_subclass, | |
1574 | !!(arg_flags & OCFS2_META_LOCK_NOQUEUE), | |
1575 | caller_ip); | |
1576 | } | |
1577 | #endif | |
ccd979bd MF |
1578 | return ret; |
1579 | } | |
1580 | ||
cb25797d JK |
1581 | static inline int ocfs2_cluster_lock(struct ocfs2_super *osb, |
1582 | struct ocfs2_lock_res *lockres, | |
1583 | int level, | |
1584 | u32 lkm_flags, | |
1585 | int arg_flags) | |
1586 | { | |
1587 | return __ocfs2_cluster_lock(osb, lockres, level, lkm_flags, arg_flags, | |
1588 | 0, _RET_IP_); | |
1589 | } | |
1590 | ||
1591 | ||
1592 | static void __ocfs2_cluster_unlock(struct ocfs2_super *osb, | |
1593 | struct ocfs2_lock_res *lockres, | |
1594 | int level, | |
1595 | unsigned long caller_ip) | |
ccd979bd MF |
1596 | { |
1597 | unsigned long flags; | |
1598 | ||
ccd979bd MF |
1599 | spin_lock_irqsave(&lockres->l_lock, flags); |
1600 | ocfs2_dec_holders(lockres, level); | |
34d024f8 | 1601 | ocfs2_downconvert_on_unlock(osb, lockres); |
ccd979bd | 1602 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
cb25797d JK |
1603 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1604 | if (lockres->l_lockdep_map.key != NULL) | |
1605 | rwsem_release(&lockres->l_lockdep_map, 1, caller_ip); | |
1606 | #endif | |
ccd979bd MF |
1607 | } |
1608 | ||
da66116e AB |
1609 | static int ocfs2_create_new_lock(struct ocfs2_super *osb, |
1610 | struct ocfs2_lock_res *lockres, | |
1611 | int ex, | |
1612 | int local) | |
ccd979bd | 1613 | { |
bd3e7610 | 1614 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd | 1615 | unsigned long flags; |
bd3e7610 | 1616 | u32 lkm_flags = local ? DLM_LKF_LOCAL : 0; |
ccd979bd MF |
1617 | |
1618 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1619 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); | |
1620 | lockres_or_flags(lockres, OCFS2_LOCK_LOCAL); | |
1621 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1622 | ||
24c19ef4 | 1623 | return ocfs2_lock_create(osb, lockres, level, lkm_flags); |
ccd979bd MF |
1624 | } |
1625 | ||
1626 | /* Grants us an EX lock on the data and metadata resources, skipping | |
1627 | * the normal cluster directory lookup. Use this ONLY on newly created | |
1628 | * inodes which other nodes can't possibly see, and which haven't been | |
1629 | * hashed in the inode hash yet. This can give us a good performance | |
1630 | * increase as it'll skip the network broadcast normally associated | |
1631 | * with creating a new lock resource. */ | |
1632 | int ocfs2_create_new_inode_locks(struct inode *inode) | |
1633 | { | |
1634 | int ret; | |
d680efe9 | 1635 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
1636 | |
1637 | BUG_ON(!inode); | |
1638 | BUG_ON(!ocfs2_inode_is_new(inode)); | |
1639 | ||
b0697053 | 1640 | mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno); |
ccd979bd MF |
1641 | |
1642 | /* NOTE: That we don't increment any of the holder counts, nor | |
1643 | * do we add anything to a journal handle. Since this is | |
1644 | * supposed to be a new inode which the cluster doesn't know | |
1645 | * about yet, there is no need to. As far as the LVB handling | |
1646 | * is concerned, this is basically like acquiring an EX lock | |
1647 | * on a resource which has an invalid one -- we'll set it | |
1648 | * valid when we release the EX. */ | |
1649 | ||
24c19ef4 | 1650 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_rw_lockres, 1, 1); |
ccd979bd MF |
1651 | if (ret) { |
1652 | mlog_errno(ret); | |
1653 | goto bail; | |
1654 | } | |
1655 | ||
24c19ef4 | 1656 | /* |
bd3e7610 | 1657 | * We don't want to use DLM_LKF_LOCAL on a meta data lock as they |
24c19ef4 MF |
1658 | * don't use a generation in their lock names. |
1659 | */ | |
e63aecb6 | 1660 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_inode_lockres, 1, 0); |
ccd979bd MF |
1661 | if (ret) { |
1662 | mlog_errno(ret); | |
1663 | goto bail; | |
1664 | } | |
1665 | ||
50008630 TY |
1666 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_open_lockres, 0, 0); |
1667 | if (ret) { | |
1668 | mlog_errno(ret); | |
1669 | goto bail; | |
1670 | } | |
1671 | ||
ccd979bd | 1672 | bail: |
ccd979bd MF |
1673 | return ret; |
1674 | } | |
1675 | ||
1676 | int ocfs2_rw_lock(struct inode *inode, int write) | |
1677 | { | |
1678 | int status, level; | |
1679 | struct ocfs2_lock_res *lockres; | |
c271c5c2 | 1680 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
1681 | |
1682 | BUG_ON(!inode); | |
1683 | ||
b0697053 MF |
1684 | mlog(0, "inode %llu take %s RW lock\n", |
1685 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1686 | write ? "EXMODE" : "PRMODE"); |
1687 | ||
c1e8d35e | 1688 | if (ocfs2_mount_local(osb)) |
c271c5c2 SM |
1689 | return 0; |
1690 | ||
ccd979bd MF |
1691 | lockres = &OCFS2_I(inode)->ip_rw_lockres; |
1692 | ||
bd3e7610 | 1693 | level = write ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd MF |
1694 | |
1695 | status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, 0, | |
1696 | 0); | |
1697 | if (status < 0) | |
1698 | mlog_errno(status); | |
1699 | ||
ccd979bd MF |
1700 | return status; |
1701 | } | |
1702 | ||
1703 | void ocfs2_rw_unlock(struct inode *inode, int write) | |
1704 | { | |
bd3e7610 | 1705 | int level = write ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd | 1706 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres; |
c271c5c2 | 1707 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 1708 | |
b0697053 MF |
1709 | mlog(0, "inode %llu drop %s RW lock\n", |
1710 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1711 | write ? "EXMODE" : "PRMODE"); |
1712 | ||
c271c5c2 SM |
1713 | if (!ocfs2_mount_local(osb)) |
1714 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); | |
ccd979bd MF |
1715 | } |
1716 | ||
50008630 TY |
1717 | /* |
1718 | * ocfs2_open_lock always get PR mode lock. | |
1719 | */ | |
1720 | int ocfs2_open_lock(struct inode *inode) | |
1721 | { | |
1722 | int status = 0; | |
1723 | struct ocfs2_lock_res *lockres; | |
1724 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1725 | ||
1726 | BUG_ON(!inode); | |
1727 | ||
50008630 TY |
1728 | mlog(0, "inode %llu take PRMODE open lock\n", |
1729 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
1730 | ||
03efed8a | 1731 | if (ocfs2_is_hard_readonly(osb) || ocfs2_mount_local(osb)) |
50008630 TY |
1732 | goto out; |
1733 | ||
1734 | lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1735 | ||
1736 | status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, | |
bd3e7610 | 1737 | DLM_LOCK_PR, 0, 0); |
50008630 TY |
1738 | if (status < 0) |
1739 | mlog_errno(status); | |
1740 | ||
1741 | out: | |
50008630 TY |
1742 | return status; |
1743 | } | |
1744 | ||
1745 | int ocfs2_try_open_lock(struct inode *inode, int write) | |
1746 | { | |
1747 | int status = 0, level; | |
1748 | struct ocfs2_lock_res *lockres; | |
1749 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1750 | ||
1751 | BUG_ON(!inode); | |
1752 | ||
50008630 TY |
1753 | mlog(0, "inode %llu try to take %s open lock\n", |
1754 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
1755 | write ? "EXMODE" : "PRMODE"); | |
1756 | ||
03efed8a TY |
1757 | if (ocfs2_is_hard_readonly(osb)) { |
1758 | if (write) | |
1759 | status = -EROFS; | |
1760 | goto out; | |
1761 | } | |
1762 | ||
50008630 TY |
1763 | if (ocfs2_mount_local(osb)) |
1764 | goto out; | |
1765 | ||
1766 | lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1767 | ||
bd3e7610 | 1768 | level = write ? DLM_LOCK_EX : DLM_LOCK_PR; |
50008630 TY |
1769 | |
1770 | /* | |
1771 | * The file system may already holding a PRMODE/EXMODE open lock. | |
bd3e7610 | 1772 | * Since we pass DLM_LKF_NOQUEUE, the request won't block waiting on |
50008630 TY |
1773 | * other nodes and the -EAGAIN will indicate to the caller that |
1774 | * this inode is still in use. | |
1775 | */ | |
1776 | status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, | |
bd3e7610 | 1777 | level, DLM_LKF_NOQUEUE, 0); |
50008630 TY |
1778 | |
1779 | out: | |
50008630 TY |
1780 | return status; |
1781 | } | |
1782 | ||
1783 | /* | |
1784 | * ocfs2_open_unlock unlock PR and EX mode open locks. | |
1785 | */ | |
1786 | void ocfs2_open_unlock(struct inode *inode) | |
1787 | { | |
1788 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1789 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1790 | ||
50008630 TY |
1791 | mlog(0, "inode %llu drop open lock\n", |
1792 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
1793 | ||
1794 | if (ocfs2_mount_local(osb)) | |
1795 | goto out; | |
1796 | ||
1797 | if(lockres->l_ro_holders) | |
1798 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, | |
bd3e7610 | 1799 | DLM_LOCK_PR); |
50008630 TY |
1800 | if(lockres->l_ex_holders) |
1801 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, | |
bd3e7610 | 1802 | DLM_LOCK_EX); |
50008630 TY |
1803 | |
1804 | out: | |
c1e8d35e | 1805 | return; |
50008630 TY |
1806 | } |
1807 | ||
cf8e06f1 MF |
1808 | static int ocfs2_flock_handle_signal(struct ocfs2_lock_res *lockres, |
1809 | int level) | |
1810 | { | |
1811 | int ret; | |
1812 | struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); | |
1813 | unsigned long flags; | |
1814 | struct ocfs2_mask_waiter mw; | |
1815 | ||
1816 | ocfs2_init_mask_waiter(&mw); | |
1817 | ||
1818 | retry_cancel: | |
1819 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1820 | if (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
1821 | ret = ocfs2_prepare_cancel_convert(osb, lockres); | |
1822 | if (ret) { | |
1823 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1824 | ret = ocfs2_cancel_convert(osb, lockres); | |
1825 | if (ret < 0) { | |
1826 | mlog_errno(ret); | |
1827 | goto out; | |
1828 | } | |
1829 | goto retry_cancel; | |
1830 | } | |
1831 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
1832 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1833 | ||
1834 | ocfs2_wait_for_mask(&mw); | |
1835 | goto retry_cancel; | |
1836 | } | |
1837 | ||
1838 | ret = -ERESTARTSYS; | |
1839 | /* | |
1840 | * We may still have gotten the lock, in which case there's no | |
1841 | * point to restarting the syscall. | |
1842 | */ | |
1843 | if (lockres->l_level == level) | |
1844 | ret = 0; | |
1845 | ||
1846 | mlog(0, "Cancel returning %d. flags: 0x%lx, level: %d, act: %d\n", ret, | |
1847 | lockres->l_flags, lockres->l_level, lockres->l_action); | |
1848 | ||
1849 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1850 | ||
1851 | out: | |
1852 | return ret; | |
1853 | } | |
1854 | ||
1855 | /* | |
1856 | * ocfs2_file_lock() and ocfs2_file_unlock() map to a single pair of | |
1857 | * flock() calls. The locking approach this requires is sufficiently | |
1858 | * different from all other cluster lock types that we implement a | |
3ad2f3fb | 1859 | * separate path to the "low-level" dlm calls. In particular: |
cf8e06f1 MF |
1860 | * |
1861 | * - No optimization of lock levels is done - we take at exactly | |
1862 | * what's been requested. | |
1863 | * | |
1864 | * - No lock caching is employed. We immediately downconvert to | |
1865 | * no-lock at unlock time. This also means flock locks never go on | |
1866 | * the blocking list). | |
1867 | * | |
1868 | * - Since userspace can trivially deadlock itself with flock, we make | |
1869 | * sure to allow cancellation of a misbehaving applications flock() | |
1870 | * request. | |
1871 | * | |
1872 | * - Access to any flock lockres doesn't require concurrency, so we | |
1873 | * can simplify the code by requiring the caller to guarantee | |
1874 | * serialization of dlmglue flock calls. | |
1875 | */ | |
1876 | int ocfs2_file_lock(struct file *file, int ex, int trylock) | |
1877 | { | |
e988cf1c MF |
1878 | int ret, level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
1879 | unsigned int lkm_flags = trylock ? DLM_LKF_NOQUEUE : 0; | |
cf8e06f1 MF |
1880 | unsigned long flags; |
1881 | struct ocfs2_file_private *fp = file->private_data; | |
1882 | struct ocfs2_lock_res *lockres = &fp->fp_flock; | |
1883 | struct ocfs2_super *osb = OCFS2_SB(file->f_mapping->host->i_sb); | |
1884 | struct ocfs2_mask_waiter mw; | |
1885 | ||
1886 | ocfs2_init_mask_waiter(&mw); | |
1887 | ||
1888 | if ((lockres->l_flags & OCFS2_LOCK_BUSY) || | |
bd3e7610 | 1889 | (lockres->l_level > DLM_LOCK_NL)) { |
cf8e06f1 MF |
1890 | mlog(ML_ERROR, |
1891 | "File lock \"%s\" has busy or locked state: flags: 0x%lx, " | |
1892 | "level: %u\n", lockres->l_name, lockres->l_flags, | |
1893 | lockres->l_level); | |
1894 | return -EINVAL; | |
1895 | } | |
1896 | ||
1897 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1898 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { | |
1899 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
1900 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1901 | ||
1902 | /* | |
1903 | * Get the lock at NLMODE to start - that way we | |
1904 | * can cancel the upconvert request if need be. | |
1905 | */ | |
e988cf1c | 1906 | ret = ocfs2_lock_create(osb, lockres, DLM_LOCK_NL, 0); |
cf8e06f1 MF |
1907 | if (ret < 0) { |
1908 | mlog_errno(ret); | |
1909 | goto out; | |
1910 | } | |
1911 | ||
1912 | ret = ocfs2_wait_for_mask(&mw); | |
1913 | if (ret) { | |
1914 | mlog_errno(ret); | |
1915 | goto out; | |
1916 | } | |
1917 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1918 | } | |
1919 | ||
1920 | lockres->l_action = OCFS2_AST_CONVERT; | |
e988cf1c | 1921 | lkm_flags |= DLM_LKF_CONVERT; |
cf8e06f1 MF |
1922 | lockres->l_requested = level; |
1923 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
1924 | ||
1925 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
1926 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1927 | ||
4670c46d | 1928 | ret = ocfs2_dlm_lock(osb->cconn, level, &lockres->l_lksb, lkm_flags, |
a796d286 | 1929 | lockres->l_name, OCFS2_LOCK_ID_MAX_LEN - 1); |
7431cd7e JB |
1930 | if (ret) { |
1931 | if (!trylock || (ret != -EAGAIN)) { | |
24ef1815 | 1932 | ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres); |
cf8e06f1 MF |
1933 | ret = -EINVAL; |
1934 | } | |
1935 | ||
1936 | ocfs2_recover_from_dlm_error(lockres, 1); | |
1937 | lockres_remove_mask_waiter(lockres, &mw); | |
1938 | goto out; | |
1939 | } | |
1940 | ||
1941 | ret = ocfs2_wait_for_mask_interruptible(&mw, lockres); | |
1942 | if (ret == -ERESTARTSYS) { | |
1943 | /* | |
1944 | * Userspace can cause deadlock itself with | |
1945 | * flock(). Current behavior locally is to allow the | |
1946 | * deadlock, but abort the system call if a signal is | |
1947 | * received. We follow this example, otherwise a | |
1948 | * poorly written program could sit in kernel until | |
1949 | * reboot. | |
1950 | * | |
1951 | * Handling this is a bit more complicated for Ocfs2 | |
1952 | * though. We can't exit this function with an | |
1953 | * outstanding lock request, so a cancel convert is | |
1954 | * required. We intentionally overwrite 'ret' - if the | |
1955 | * cancel fails and the lock was granted, it's easier | |
af901ca1 | 1956 | * to just bubble success back up to the user. |
cf8e06f1 MF |
1957 | */ |
1958 | ret = ocfs2_flock_handle_signal(lockres, level); | |
1693a5c0 DT |
1959 | } else if (!ret && (level > lockres->l_level)) { |
1960 | /* Trylock failed asynchronously */ | |
1961 | BUG_ON(!trylock); | |
1962 | ret = -EAGAIN; | |
cf8e06f1 MF |
1963 | } |
1964 | ||
1965 | out: | |
1966 | ||
1967 | mlog(0, "Lock: \"%s\" ex: %d, trylock: %d, returns: %d\n", | |
1968 | lockres->l_name, ex, trylock, ret); | |
1969 | return ret; | |
1970 | } | |
1971 | ||
1972 | void ocfs2_file_unlock(struct file *file) | |
1973 | { | |
1974 | int ret; | |
de551246 | 1975 | unsigned int gen; |
cf8e06f1 MF |
1976 | unsigned long flags; |
1977 | struct ocfs2_file_private *fp = file->private_data; | |
1978 | struct ocfs2_lock_res *lockres = &fp->fp_flock; | |
1979 | struct ocfs2_super *osb = OCFS2_SB(file->f_mapping->host->i_sb); | |
1980 | struct ocfs2_mask_waiter mw; | |
1981 | ||
1982 | ocfs2_init_mask_waiter(&mw); | |
1983 | ||
1984 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) | |
1985 | return; | |
1986 | ||
e988cf1c | 1987 | if (lockres->l_level == DLM_LOCK_NL) |
cf8e06f1 MF |
1988 | return; |
1989 | ||
1990 | mlog(0, "Unlock: \"%s\" flags: 0x%lx, level: %d, act: %d\n", | |
1991 | lockres->l_name, lockres->l_flags, lockres->l_level, | |
1992 | lockres->l_action); | |
1993 | ||
1994 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1995 | /* | |
1996 | * Fake a blocking ast for the downconvert code. | |
1997 | */ | |
1998 | lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); | |
bd3e7610 | 1999 | lockres->l_blocking = DLM_LOCK_EX; |
cf8e06f1 | 2000 | |
e988cf1c | 2001 | gen = ocfs2_prepare_downconvert(lockres, DLM_LOCK_NL); |
cf8e06f1 MF |
2002 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); |
2003 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2004 | ||
e988cf1c | 2005 | ret = ocfs2_downconvert_lock(osb, lockres, DLM_LOCK_NL, 0, gen); |
cf8e06f1 MF |
2006 | if (ret) { |
2007 | mlog_errno(ret); | |
2008 | return; | |
2009 | } | |
2010 | ||
2011 | ret = ocfs2_wait_for_mask(&mw); | |
2012 | if (ret) | |
2013 | mlog_errno(ret); | |
2014 | } | |
2015 | ||
34d024f8 MF |
2016 | static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb, |
2017 | struct ocfs2_lock_res *lockres) | |
ccd979bd MF |
2018 | { |
2019 | int kick = 0; | |
2020 | ||
ccd979bd | 2021 | /* If we know that another node is waiting on our lock, kick |
34d024f8 | 2022 | * the downconvert thread * pre-emptively when we reach a release |
ccd979bd MF |
2023 | * condition. */ |
2024 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) { | |
2025 | switch(lockres->l_blocking) { | |
bd3e7610 | 2026 | case DLM_LOCK_EX: |
ccd979bd MF |
2027 | if (!lockres->l_ex_holders && !lockres->l_ro_holders) |
2028 | kick = 1; | |
2029 | break; | |
bd3e7610 | 2030 | case DLM_LOCK_PR: |
ccd979bd MF |
2031 | if (!lockres->l_ex_holders) |
2032 | kick = 1; | |
2033 | break; | |
2034 | default: | |
2035 | BUG(); | |
2036 | } | |
2037 | } | |
2038 | ||
2039 | if (kick) | |
34d024f8 | 2040 | ocfs2_wake_downconvert_thread(osb); |
ccd979bd MF |
2041 | } |
2042 | ||
ccd979bd MF |
2043 | #define OCFS2_SEC_BITS 34 |
2044 | #define OCFS2_SEC_SHIFT (64 - 34) | |
2045 | #define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1) | |
2046 | ||
2047 | /* LVB only has room for 64 bits of time here so we pack it for | |
2048 | * now. */ | |
2049 | static u64 ocfs2_pack_timespec(struct timespec *spec) | |
2050 | { | |
2051 | u64 res; | |
2052 | u64 sec = spec->tv_sec; | |
2053 | u32 nsec = spec->tv_nsec; | |
2054 | ||
2055 | res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK); | |
2056 | ||
2057 | return res; | |
2058 | } | |
2059 | ||
2060 | /* Call this with the lockres locked. I am reasonably sure we don't | |
2061 | * need ip_lock in this function as anyone who would be changing those | |
e63aecb6 | 2062 | * values is supposed to be blocked in ocfs2_inode_lock right now. */ |
ccd979bd MF |
2063 | static void __ocfs2_stuff_meta_lvb(struct inode *inode) |
2064 | { | |
2065 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
e63aecb6 | 2066 | struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
ccd979bd MF |
2067 | struct ocfs2_meta_lvb *lvb; |
2068 | ||
a641dc2a | 2069 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
ccd979bd | 2070 | |
24c19ef4 MF |
2071 | /* |
2072 | * Invalidate the LVB of a deleted inode - this way other | |
2073 | * nodes are forced to go to disk and discover the new inode | |
2074 | * status. | |
2075 | */ | |
2076 | if (oi->ip_flags & OCFS2_INODE_DELETED) { | |
2077 | lvb->lvb_version = 0; | |
2078 | goto out; | |
2079 | } | |
2080 | ||
4d3b83f7 | 2081 | lvb->lvb_version = OCFS2_LVB_VERSION; |
ccd979bd MF |
2082 | lvb->lvb_isize = cpu_to_be64(i_size_read(inode)); |
2083 | lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters); | |
03ab30f7 EB |
2084 | lvb->lvb_iuid = cpu_to_be32(i_uid_read(inode)); |
2085 | lvb->lvb_igid = cpu_to_be32(i_gid_read(inode)); | |
ccd979bd MF |
2086 | lvb->lvb_imode = cpu_to_be16(inode->i_mode); |
2087 | lvb->lvb_inlink = cpu_to_be16(inode->i_nlink); | |
2088 | lvb->lvb_iatime_packed = | |
2089 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime)); | |
2090 | lvb->lvb_ictime_packed = | |
2091 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime)); | |
2092 | lvb->lvb_imtime_packed = | |
2093 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime)); | |
ca4d147e | 2094 | lvb->lvb_iattr = cpu_to_be32(oi->ip_attr); |
15b1e36b | 2095 | lvb->lvb_idynfeatures = cpu_to_be16(oi->ip_dyn_features); |
f9e2d82e | 2096 | lvb->lvb_igeneration = cpu_to_be32(inode->i_generation); |
ccd979bd | 2097 | |
24c19ef4 | 2098 | out: |
ccd979bd | 2099 | mlog_meta_lvb(0, lockres); |
ccd979bd MF |
2100 | } |
2101 | ||
2102 | static void ocfs2_unpack_timespec(struct timespec *spec, | |
2103 | u64 packed_time) | |
2104 | { | |
2105 | spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT; | |
2106 | spec->tv_nsec = packed_time & OCFS2_NSEC_MASK; | |
2107 | } | |
2108 | ||
2109 | static void ocfs2_refresh_inode_from_lvb(struct inode *inode) | |
2110 | { | |
2111 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
e63aecb6 | 2112 | struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
ccd979bd MF |
2113 | struct ocfs2_meta_lvb *lvb; |
2114 | ||
ccd979bd MF |
2115 | mlog_meta_lvb(0, lockres); |
2116 | ||
a641dc2a | 2117 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
ccd979bd MF |
2118 | |
2119 | /* We're safe here without the lockres lock... */ | |
2120 | spin_lock(&oi->ip_lock); | |
2121 | oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters); | |
2122 | i_size_write(inode, be64_to_cpu(lvb->lvb_isize)); | |
2123 | ||
ca4d147e | 2124 | oi->ip_attr = be32_to_cpu(lvb->lvb_iattr); |
15b1e36b | 2125 | oi->ip_dyn_features = be16_to_cpu(lvb->lvb_idynfeatures); |
ca4d147e HP |
2126 | ocfs2_set_inode_flags(inode); |
2127 | ||
ccd979bd MF |
2128 | /* fast-symlinks are a special case */ |
2129 | if (S_ISLNK(inode->i_mode) && !oi->ip_clusters) | |
2130 | inode->i_blocks = 0; | |
2131 | else | |
8110b073 | 2132 | inode->i_blocks = ocfs2_inode_sector_count(inode); |
ccd979bd | 2133 | |
03ab30f7 EB |
2134 | i_uid_write(inode, be32_to_cpu(lvb->lvb_iuid)); |
2135 | i_gid_write(inode, be32_to_cpu(lvb->lvb_igid)); | |
ccd979bd | 2136 | inode->i_mode = be16_to_cpu(lvb->lvb_imode); |
bfe86848 | 2137 | set_nlink(inode, be16_to_cpu(lvb->lvb_inlink)); |
ccd979bd MF |
2138 | ocfs2_unpack_timespec(&inode->i_atime, |
2139 | be64_to_cpu(lvb->lvb_iatime_packed)); | |
2140 | ocfs2_unpack_timespec(&inode->i_mtime, | |
2141 | be64_to_cpu(lvb->lvb_imtime_packed)); | |
2142 | ocfs2_unpack_timespec(&inode->i_ctime, | |
2143 | be64_to_cpu(lvb->lvb_ictime_packed)); | |
2144 | spin_unlock(&oi->ip_lock); | |
ccd979bd MF |
2145 | } |
2146 | ||
f9e2d82e MF |
2147 | static inline int ocfs2_meta_lvb_is_trustable(struct inode *inode, |
2148 | struct ocfs2_lock_res *lockres) | |
ccd979bd | 2149 | { |
a641dc2a | 2150 | struct ocfs2_meta_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
ccd979bd | 2151 | |
1c520dfb JB |
2152 | if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) |
2153 | && lvb->lvb_version == OCFS2_LVB_VERSION | |
f9e2d82e | 2154 | && be32_to_cpu(lvb->lvb_igeneration) == inode->i_generation) |
ccd979bd MF |
2155 | return 1; |
2156 | return 0; | |
2157 | } | |
2158 | ||
2159 | /* Determine whether a lock resource needs to be refreshed, and | |
2160 | * arbitrate who gets to refresh it. | |
2161 | * | |
2162 | * 0 means no refresh needed. | |
2163 | * | |
2164 | * > 0 means you need to refresh this and you MUST call | |
2165 | * ocfs2_complete_lock_res_refresh afterwards. */ | |
2166 | static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres) | |
2167 | { | |
2168 | unsigned long flags; | |
2169 | int status = 0; | |
2170 | ||
ccd979bd MF |
2171 | refresh_check: |
2172 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2173 | if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) { | |
2174 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2175 | goto bail; | |
2176 | } | |
2177 | ||
2178 | if (lockres->l_flags & OCFS2_LOCK_REFRESHING) { | |
2179 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2180 | ||
2181 | ocfs2_wait_on_refreshing_lock(lockres); | |
2182 | goto refresh_check; | |
2183 | } | |
2184 | ||
2185 | /* Ok, I'll be the one to refresh this lock. */ | |
2186 | lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING); | |
2187 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2188 | ||
2189 | status = 1; | |
2190 | bail: | |
c1e8d35e | 2191 | mlog(0, "status %d\n", status); |
ccd979bd MF |
2192 | return status; |
2193 | } | |
2194 | ||
2195 | /* If status is non zero, I'll mark it as not being in refresh | |
2196 | * anymroe, but i won't clear the needs refresh flag. */ | |
2197 | static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres, | |
2198 | int status) | |
2199 | { | |
2200 | unsigned long flags; | |
ccd979bd MF |
2201 | |
2202 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2203 | lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING); | |
2204 | if (!status) | |
2205 | lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); | |
2206 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2207 | ||
2208 | wake_up(&lockres->l_event); | |
ccd979bd MF |
2209 | } |
2210 | ||
2211 | /* may or may not return a bh if it went to disk. */ | |
e63aecb6 | 2212 | static int ocfs2_inode_lock_update(struct inode *inode, |
ccd979bd MF |
2213 | struct buffer_head **bh) |
2214 | { | |
2215 | int status = 0; | |
2216 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
e63aecb6 | 2217 | struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
ccd979bd | 2218 | struct ocfs2_dinode *fe; |
c271c5c2 | 2219 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 2220 | |
be9e986b MF |
2221 | if (ocfs2_mount_local(osb)) |
2222 | goto bail; | |
2223 | ||
ccd979bd MF |
2224 | spin_lock(&oi->ip_lock); |
2225 | if (oi->ip_flags & OCFS2_INODE_DELETED) { | |
b0697053 | 2226 | mlog(0, "Orphaned inode %llu was deleted while we " |
ccd979bd | 2227 | "were waiting on a lock. ip_flags = 0x%x\n", |
b0697053 | 2228 | (unsigned long long)oi->ip_blkno, oi->ip_flags); |
ccd979bd MF |
2229 | spin_unlock(&oi->ip_lock); |
2230 | status = -ENOENT; | |
2231 | goto bail; | |
2232 | } | |
2233 | spin_unlock(&oi->ip_lock); | |
2234 | ||
be9e986b MF |
2235 | if (!ocfs2_should_refresh_lock_res(lockres)) |
2236 | goto bail; | |
ccd979bd MF |
2237 | |
2238 | /* This will discard any caching information we might have had | |
2239 | * for the inode metadata. */ | |
8cb471e8 | 2240 | ocfs2_metadata_cache_purge(INODE_CACHE(inode)); |
ccd979bd | 2241 | |
83418978 MF |
2242 | ocfs2_extent_map_trunc(inode, 0); |
2243 | ||
be9e986b | 2244 | if (ocfs2_meta_lvb_is_trustable(inode, lockres)) { |
b0697053 MF |
2245 | mlog(0, "Trusting LVB on inode %llu\n", |
2246 | (unsigned long long)oi->ip_blkno); | |
ccd979bd MF |
2247 | ocfs2_refresh_inode_from_lvb(inode); |
2248 | } else { | |
2249 | /* Boo, we have to go to disk. */ | |
2250 | /* read bh, cast, ocfs2_refresh_inode */ | |
b657c95c | 2251 | status = ocfs2_read_inode_block(inode, bh); |
ccd979bd MF |
2252 | if (status < 0) { |
2253 | mlog_errno(status); | |
2254 | goto bail_refresh; | |
2255 | } | |
2256 | fe = (struct ocfs2_dinode *) (*bh)->b_data; | |
2257 | ||
2258 | /* This is a good chance to make sure we're not | |
b657c95c JB |
2259 | * locking an invalid object. ocfs2_read_inode_block() |
2260 | * already checked that the inode block is sane. | |
ccd979bd MF |
2261 | * |
2262 | * We bug on a stale inode here because we checked | |
2263 | * above whether it was wiped from disk. The wiping | |
2264 | * node provides a guarantee that we receive that | |
2265 | * message and can mark the inode before dropping any | |
2266 | * locks associated with it. */ | |
ccd979bd MF |
2267 | mlog_bug_on_msg(inode->i_generation != |
2268 | le32_to_cpu(fe->i_generation), | |
b0697053 | 2269 | "Invalid dinode %llu disk generation: %u " |
ccd979bd | 2270 | "inode->i_generation: %u\n", |
b0697053 MF |
2271 | (unsigned long long)oi->ip_blkno, |
2272 | le32_to_cpu(fe->i_generation), | |
ccd979bd MF |
2273 | inode->i_generation); |
2274 | mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) || | |
2275 | !(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)), | |
b0697053 MF |
2276 | "Stale dinode %llu dtime: %llu flags: 0x%x\n", |
2277 | (unsigned long long)oi->ip_blkno, | |
2278 | (unsigned long long)le64_to_cpu(fe->i_dtime), | |
ccd979bd MF |
2279 | le32_to_cpu(fe->i_flags)); |
2280 | ||
2281 | ocfs2_refresh_inode(inode, fe); | |
8ddb7b00 | 2282 | ocfs2_track_lock_refresh(lockres); |
ccd979bd MF |
2283 | } |
2284 | ||
2285 | status = 0; | |
2286 | bail_refresh: | |
be9e986b | 2287 | ocfs2_complete_lock_res_refresh(lockres, status); |
ccd979bd | 2288 | bail: |
ccd979bd MF |
2289 | return status; |
2290 | } | |
2291 | ||
2292 | static int ocfs2_assign_bh(struct inode *inode, | |
2293 | struct buffer_head **ret_bh, | |
2294 | struct buffer_head *passed_bh) | |
2295 | { | |
2296 | int status; | |
2297 | ||
2298 | if (passed_bh) { | |
2299 | /* Ok, the update went to disk for us, use the | |
2300 | * returned bh. */ | |
2301 | *ret_bh = passed_bh; | |
2302 | get_bh(*ret_bh); | |
2303 | ||
2304 | return 0; | |
2305 | } | |
2306 | ||
b657c95c | 2307 | status = ocfs2_read_inode_block(inode, ret_bh); |
ccd979bd MF |
2308 | if (status < 0) |
2309 | mlog_errno(status); | |
2310 | ||
2311 | return status; | |
2312 | } | |
2313 | ||
2314 | /* | |
2315 | * returns < 0 error if the callback will never be called, otherwise | |
2316 | * the result of the lock will be communicated via the callback. | |
2317 | */ | |
cb25797d JK |
2318 | int ocfs2_inode_lock_full_nested(struct inode *inode, |
2319 | struct buffer_head **ret_bh, | |
2320 | int ex, | |
2321 | int arg_flags, | |
2322 | int subclass) | |
ccd979bd | 2323 | { |
bd3e7610 JB |
2324 | int status, level, acquired; |
2325 | u32 dlm_flags; | |
c271c5c2 | 2326 | struct ocfs2_lock_res *lockres = NULL; |
ccd979bd MF |
2327 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
2328 | struct buffer_head *local_bh = NULL; | |
2329 | ||
2330 | BUG_ON(!inode); | |
2331 | ||
b0697053 MF |
2332 | mlog(0, "inode %llu, take %s META lock\n", |
2333 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
2334 | ex ? "EXMODE" : "PRMODE"); |
2335 | ||
2336 | status = 0; | |
2337 | acquired = 0; | |
2338 | /* We'll allow faking a readonly metadata lock for | |
2339 | * rodevices. */ | |
2340 | if (ocfs2_is_hard_readonly(osb)) { | |
2341 | if (ex) | |
2342 | status = -EROFS; | |
03efed8a | 2343 | goto getbh; |
ccd979bd MF |
2344 | } |
2345 | ||
c271c5c2 SM |
2346 | if (ocfs2_mount_local(osb)) |
2347 | goto local; | |
2348 | ||
ccd979bd | 2349 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) |
553abd04 | 2350 | ocfs2_wait_for_recovery(osb); |
ccd979bd | 2351 | |
e63aecb6 | 2352 | lockres = &OCFS2_I(inode)->ip_inode_lockres; |
bd3e7610 | 2353 | level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd MF |
2354 | dlm_flags = 0; |
2355 | if (arg_flags & OCFS2_META_LOCK_NOQUEUE) | |
bd3e7610 | 2356 | dlm_flags |= DLM_LKF_NOQUEUE; |
ccd979bd | 2357 | |
cb25797d JK |
2358 | status = __ocfs2_cluster_lock(osb, lockres, level, dlm_flags, |
2359 | arg_flags, subclass, _RET_IP_); | |
ccd979bd | 2360 | if (status < 0) { |
41003a7b | 2361 | if (status != -EAGAIN) |
ccd979bd MF |
2362 | mlog_errno(status); |
2363 | goto bail; | |
2364 | } | |
2365 | ||
2366 | /* Notify the error cleanup path to drop the cluster lock. */ | |
2367 | acquired = 1; | |
2368 | ||
2369 | /* We wait twice because a node may have died while we were in | |
2370 | * the lower dlm layers. The second time though, we've | |
2371 | * committed to owning this lock so we don't allow signals to | |
2372 | * abort the operation. */ | |
2373 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) | |
553abd04 | 2374 | ocfs2_wait_for_recovery(osb); |
ccd979bd | 2375 | |
c271c5c2 | 2376 | local: |
24c19ef4 MF |
2377 | /* |
2378 | * We only see this flag if we're being called from | |
2379 | * ocfs2_read_locked_inode(). It means we're locking an inode | |
2380 | * which hasn't been populated yet, so clear the refresh flag | |
2381 | * and let the caller handle it. | |
2382 | */ | |
2383 | if (inode->i_state & I_NEW) { | |
2384 | status = 0; | |
c271c5c2 SM |
2385 | if (lockres) |
2386 | ocfs2_complete_lock_res_refresh(lockres, 0); | |
24c19ef4 MF |
2387 | goto bail; |
2388 | } | |
2389 | ||
ccd979bd | 2390 | /* This is fun. The caller may want a bh back, or it may |
e63aecb6 | 2391 | * not. ocfs2_inode_lock_update definitely wants one in, but |
ccd979bd MF |
2392 | * may or may not read one, depending on what's in the |
2393 | * LVB. The result of all of this is that we've *only* gone to | |
2394 | * disk if we have to, so the complexity is worthwhile. */ | |
e63aecb6 | 2395 | status = ocfs2_inode_lock_update(inode, &local_bh); |
ccd979bd MF |
2396 | if (status < 0) { |
2397 | if (status != -ENOENT) | |
2398 | mlog_errno(status); | |
2399 | goto bail; | |
2400 | } | |
03efed8a | 2401 | getbh: |
ccd979bd MF |
2402 | if (ret_bh) { |
2403 | status = ocfs2_assign_bh(inode, ret_bh, local_bh); | |
2404 | if (status < 0) { | |
2405 | mlog_errno(status); | |
2406 | goto bail; | |
2407 | } | |
2408 | } | |
2409 | ||
ccd979bd MF |
2410 | bail: |
2411 | if (status < 0) { | |
2412 | if (ret_bh && (*ret_bh)) { | |
2413 | brelse(*ret_bh); | |
2414 | *ret_bh = NULL; | |
2415 | } | |
2416 | if (acquired) | |
e63aecb6 | 2417 | ocfs2_inode_unlock(inode, ex); |
ccd979bd MF |
2418 | } |
2419 | ||
2420 | if (local_bh) | |
2421 | brelse(local_bh); | |
2422 | ||
ccd979bd MF |
2423 | return status; |
2424 | } | |
2425 | ||
2426 | /* | |
34d024f8 MF |
2427 | * This is working around a lock inversion between tasks acquiring DLM |
2428 | * locks while holding a page lock and the downconvert thread which | |
2429 | * blocks dlm lock acquiry while acquiring page locks. | |
ccd979bd MF |
2430 | * |
2431 | * ** These _with_page variantes are only intended to be called from aop | |
2432 | * methods that hold page locks and return a very specific *positive* error | |
2433 | * code that aop methods pass up to the VFS -- test for errors with != 0. ** | |
2434 | * | |
34d024f8 MF |
2435 | * The DLM is called such that it returns -EAGAIN if it would have |
2436 | * blocked waiting for the downconvert thread. In that case we unlock | |
2437 | * our page so the downconvert thread can make progress. Once we've | |
2438 | * done this we have to return AOP_TRUNCATED_PAGE so the aop method | |
2439 | * that called us can bubble that back up into the VFS who will then | |
2440 | * immediately retry the aop call. | |
ccd979bd | 2441 | */ |
e63aecb6 | 2442 | int ocfs2_inode_lock_with_page(struct inode *inode, |
ccd979bd MF |
2443 | struct buffer_head **ret_bh, |
2444 | int ex, | |
2445 | struct page *page) | |
2446 | { | |
2447 | int ret; | |
2448 | ||
e63aecb6 | 2449 | ret = ocfs2_inode_lock_full(inode, ret_bh, ex, OCFS2_LOCK_NONBLOCK); |
ccd979bd MF |
2450 | if (ret == -EAGAIN) { |
2451 | unlock_page(page); | |
ccd979bd MF |
2452 | ret = AOP_TRUNCATED_PAGE; |
2453 | } | |
2454 | ||
2455 | return ret; | |
2456 | } | |
2457 | ||
e63aecb6 | 2458 | int ocfs2_inode_lock_atime(struct inode *inode, |
7f1a37e3 TY |
2459 | struct vfsmount *vfsmnt, |
2460 | int *level) | |
2461 | { | |
2462 | int ret; | |
2463 | ||
e63aecb6 | 2464 | ret = ocfs2_inode_lock(inode, NULL, 0); |
7f1a37e3 TY |
2465 | if (ret < 0) { |
2466 | mlog_errno(ret); | |
2467 | return ret; | |
2468 | } | |
2469 | ||
2470 | /* | |
2471 | * If we should update atime, we will get EX lock, | |
2472 | * otherwise we just get PR lock. | |
2473 | */ | |
2474 | if (ocfs2_should_update_atime(inode, vfsmnt)) { | |
2475 | struct buffer_head *bh = NULL; | |
2476 | ||
e63aecb6 MF |
2477 | ocfs2_inode_unlock(inode, 0); |
2478 | ret = ocfs2_inode_lock(inode, &bh, 1); | |
7f1a37e3 TY |
2479 | if (ret < 0) { |
2480 | mlog_errno(ret); | |
2481 | return ret; | |
2482 | } | |
2483 | *level = 1; | |
2484 | if (ocfs2_should_update_atime(inode, vfsmnt)) | |
2485 | ocfs2_update_inode_atime(inode, bh); | |
2486 | if (bh) | |
2487 | brelse(bh); | |
2488 | } else | |
2489 | *level = 0; | |
2490 | ||
7f1a37e3 TY |
2491 | return ret; |
2492 | } | |
2493 | ||
e63aecb6 | 2494 | void ocfs2_inode_unlock(struct inode *inode, |
ccd979bd MF |
2495 | int ex) |
2496 | { | |
bd3e7610 | 2497 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
e63aecb6 | 2498 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_inode_lockres; |
c271c5c2 | 2499 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 2500 | |
b0697053 MF |
2501 | mlog(0, "inode %llu drop %s META lock\n", |
2502 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
2503 | ex ? "EXMODE" : "PRMODE"); |
2504 | ||
c271c5c2 SM |
2505 | if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)) && |
2506 | !ocfs2_mount_local(osb)) | |
ccd979bd | 2507 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); |
ccd979bd MF |
2508 | } |
2509 | ||
df152c24 | 2510 | int ocfs2_orphan_scan_lock(struct ocfs2_super *osb, u32 *seqno) |
83273932 SE |
2511 | { |
2512 | struct ocfs2_lock_res *lockres; | |
2513 | struct ocfs2_orphan_scan_lvb *lvb; | |
83273932 SE |
2514 | int status = 0; |
2515 | ||
df152c24 SM |
2516 | if (ocfs2_is_hard_readonly(osb)) |
2517 | return -EROFS; | |
2518 | ||
2519 | if (ocfs2_mount_local(osb)) | |
2520 | return 0; | |
2521 | ||
83273932 | 2522 | lockres = &osb->osb_orphan_scan.os_lockres; |
df152c24 | 2523 | status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX, 0, 0); |
83273932 SE |
2524 | if (status < 0) |
2525 | return status; | |
2526 | ||
2527 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
1c520dfb JB |
2528 | if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) && |
2529 | lvb->lvb_version == OCFS2_ORPHAN_LVB_VERSION) | |
83273932 | 2530 | *seqno = be32_to_cpu(lvb->lvb_os_seqno); |
3211949f SM |
2531 | else |
2532 | *seqno = osb->osb_orphan_scan.os_seqno + 1; | |
2533 | ||
83273932 SE |
2534 | return status; |
2535 | } | |
2536 | ||
df152c24 | 2537 | void ocfs2_orphan_scan_unlock(struct ocfs2_super *osb, u32 seqno) |
83273932 SE |
2538 | { |
2539 | struct ocfs2_lock_res *lockres; | |
2540 | struct ocfs2_orphan_scan_lvb *lvb; | |
83273932 | 2541 | |
df152c24 SM |
2542 | if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb)) { |
2543 | lockres = &osb->osb_orphan_scan.os_lockres; | |
2544 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
2545 | lvb->lvb_version = OCFS2_ORPHAN_LVB_VERSION; | |
2546 | lvb->lvb_os_seqno = cpu_to_be32(seqno); | |
2547 | ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX); | |
2548 | } | |
83273932 SE |
2549 | } |
2550 | ||
ccd979bd MF |
2551 | int ocfs2_super_lock(struct ocfs2_super *osb, |
2552 | int ex) | |
2553 | { | |
c271c5c2 | 2554 | int status = 0; |
bd3e7610 | 2555 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd | 2556 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; |
ccd979bd | 2557 | |
ccd979bd MF |
2558 | if (ocfs2_is_hard_readonly(osb)) |
2559 | return -EROFS; | |
2560 | ||
c271c5c2 SM |
2561 | if (ocfs2_mount_local(osb)) |
2562 | goto bail; | |
2563 | ||
ccd979bd MF |
2564 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); |
2565 | if (status < 0) { | |
2566 | mlog_errno(status); | |
2567 | goto bail; | |
2568 | } | |
2569 | ||
2570 | /* The super block lock path is really in the best position to | |
2571 | * know when resources covered by the lock need to be | |
2572 | * refreshed, so we do it here. Of course, making sense of | |
2573 | * everything is up to the caller :) */ | |
2574 | status = ocfs2_should_refresh_lock_res(lockres); | |
ccd979bd | 2575 | if (status) { |
8e8a4603 | 2576 | status = ocfs2_refresh_slot_info(osb); |
ccd979bd MF |
2577 | |
2578 | ocfs2_complete_lock_res_refresh(lockres, status); | |
2579 | ||
3278bb74 JB |
2580 | if (status < 0) { |
2581 | ocfs2_cluster_unlock(osb, lockres, level); | |
ccd979bd | 2582 | mlog_errno(status); |
3278bb74 | 2583 | } |
8ddb7b00 | 2584 | ocfs2_track_lock_refresh(lockres); |
ccd979bd MF |
2585 | } |
2586 | bail: | |
ccd979bd MF |
2587 | return status; |
2588 | } | |
2589 | ||
2590 | void ocfs2_super_unlock(struct ocfs2_super *osb, | |
2591 | int ex) | |
2592 | { | |
bd3e7610 | 2593 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd MF |
2594 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; |
2595 | ||
c271c5c2 SM |
2596 | if (!ocfs2_mount_local(osb)) |
2597 | ocfs2_cluster_unlock(osb, lockres, level); | |
ccd979bd MF |
2598 | } |
2599 | ||
2600 | int ocfs2_rename_lock(struct ocfs2_super *osb) | |
2601 | { | |
2602 | int status; | |
2603 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; | |
2604 | ||
2605 | if (ocfs2_is_hard_readonly(osb)) | |
2606 | return -EROFS; | |
2607 | ||
c271c5c2 SM |
2608 | if (ocfs2_mount_local(osb)) |
2609 | return 0; | |
2610 | ||
bd3e7610 | 2611 | status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX, 0, 0); |
ccd979bd MF |
2612 | if (status < 0) |
2613 | mlog_errno(status); | |
2614 | ||
2615 | return status; | |
2616 | } | |
2617 | ||
2618 | void ocfs2_rename_unlock(struct ocfs2_super *osb) | |
2619 | { | |
2620 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; | |
2621 | ||
c271c5c2 | 2622 | if (!ocfs2_mount_local(osb)) |
bd3e7610 | 2623 | ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX); |
ccd979bd MF |
2624 | } |
2625 | ||
6ca497a8 | 2626 | int ocfs2_nfs_sync_lock(struct ocfs2_super *osb, int ex) |
2627 | { | |
2628 | int status; | |
2629 | struct ocfs2_lock_res *lockres = &osb->osb_nfs_sync_lockres; | |
2630 | ||
2631 | if (ocfs2_is_hard_readonly(osb)) | |
2632 | return -EROFS; | |
2633 | ||
2634 | if (ocfs2_mount_local(osb)) | |
2635 | return 0; | |
2636 | ||
2637 | status = ocfs2_cluster_lock(osb, lockres, ex ? LKM_EXMODE : LKM_PRMODE, | |
2638 | 0, 0); | |
2639 | if (status < 0) | |
2640 | mlog(ML_ERROR, "lock on nfs sync lock failed %d\n", status); | |
2641 | ||
2642 | return status; | |
2643 | } | |
2644 | ||
2645 | void ocfs2_nfs_sync_unlock(struct ocfs2_super *osb, int ex) | |
2646 | { | |
2647 | struct ocfs2_lock_res *lockres = &osb->osb_nfs_sync_lockres; | |
2648 | ||
2649 | if (!ocfs2_mount_local(osb)) | |
2650 | ocfs2_cluster_unlock(osb, lockres, | |
2651 | ex ? LKM_EXMODE : LKM_PRMODE); | |
2652 | } | |
2653 | ||
d680efe9 MF |
2654 | int ocfs2_dentry_lock(struct dentry *dentry, int ex) |
2655 | { | |
2656 | int ret; | |
bd3e7610 | 2657 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
d680efe9 MF |
2658 | struct ocfs2_dentry_lock *dl = dentry->d_fsdata; |
2659 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); | |
2660 | ||
2661 | BUG_ON(!dl); | |
2662 | ||
03efed8a TY |
2663 | if (ocfs2_is_hard_readonly(osb)) { |
2664 | if (ex) | |
2665 | return -EROFS; | |
2666 | return 0; | |
2667 | } | |
d680efe9 | 2668 | |
c271c5c2 SM |
2669 | if (ocfs2_mount_local(osb)) |
2670 | return 0; | |
2671 | ||
d680efe9 MF |
2672 | ret = ocfs2_cluster_lock(osb, &dl->dl_lockres, level, 0, 0); |
2673 | if (ret < 0) | |
2674 | mlog_errno(ret); | |
2675 | ||
2676 | return ret; | |
2677 | } | |
2678 | ||
2679 | void ocfs2_dentry_unlock(struct dentry *dentry, int ex) | |
2680 | { | |
bd3e7610 | 2681 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
d680efe9 MF |
2682 | struct ocfs2_dentry_lock *dl = dentry->d_fsdata; |
2683 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); | |
2684 | ||
03efed8a | 2685 | if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb)) |
c271c5c2 | 2686 | ocfs2_cluster_unlock(osb, &dl->dl_lockres, level); |
d680efe9 MF |
2687 | } |
2688 | ||
ccd979bd MF |
2689 | /* Reference counting of the dlm debug structure. We want this because |
2690 | * open references on the debug inodes can live on after a mount, so | |
2691 | * we can't rely on the ocfs2_super to always exist. */ | |
2692 | static void ocfs2_dlm_debug_free(struct kref *kref) | |
2693 | { | |
2694 | struct ocfs2_dlm_debug *dlm_debug; | |
2695 | ||
2696 | dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt); | |
2697 | ||
2698 | kfree(dlm_debug); | |
2699 | } | |
2700 | ||
2701 | void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug) | |
2702 | { | |
2703 | if (dlm_debug) | |
2704 | kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free); | |
2705 | } | |
2706 | ||
2707 | static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug) | |
2708 | { | |
2709 | kref_get(&debug->d_refcnt); | |
2710 | } | |
2711 | ||
2712 | struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void) | |
2713 | { | |
2714 | struct ocfs2_dlm_debug *dlm_debug; | |
2715 | ||
2716 | dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL); | |
2717 | if (!dlm_debug) { | |
2718 | mlog_errno(-ENOMEM); | |
2719 | goto out; | |
2720 | } | |
2721 | ||
2722 | kref_init(&dlm_debug->d_refcnt); | |
2723 | INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking); | |
2724 | dlm_debug->d_locking_state = NULL; | |
2725 | out: | |
2726 | return dlm_debug; | |
2727 | } | |
2728 | ||
2729 | /* Access to this is arbitrated for us via seq_file->sem. */ | |
2730 | struct ocfs2_dlm_seq_priv { | |
2731 | struct ocfs2_dlm_debug *p_dlm_debug; | |
2732 | struct ocfs2_lock_res p_iter_res; | |
2733 | struct ocfs2_lock_res p_tmp_res; | |
2734 | }; | |
2735 | ||
2736 | static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start, | |
2737 | struct ocfs2_dlm_seq_priv *priv) | |
2738 | { | |
2739 | struct ocfs2_lock_res *iter, *ret = NULL; | |
2740 | struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug; | |
2741 | ||
2742 | assert_spin_locked(&ocfs2_dlm_tracking_lock); | |
2743 | ||
2744 | list_for_each_entry(iter, &start->l_debug_list, l_debug_list) { | |
2745 | /* discover the head of the list */ | |
2746 | if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) { | |
2747 | mlog(0, "End of list found, %p\n", ret); | |
2748 | break; | |
2749 | } | |
2750 | ||
2751 | /* We track our "dummy" iteration lockres' by a NULL | |
2752 | * l_ops field. */ | |
2753 | if (iter->l_ops != NULL) { | |
2754 | ret = iter; | |
2755 | break; | |
2756 | } | |
2757 | } | |
2758 | ||
2759 | return ret; | |
2760 | } | |
2761 | ||
2762 | static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos) | |
2763 | { | |
2764 | struct ocfs2_dlm_seq_priv *priv = m->private; | |
2765 | struct ocfs2_lock_res *iter; | |
2766 | ||
2767 | spin_lock(&ocfs2_dlm_tracking_lock); | |
2768 | iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv); | |
2769 | if (iter) { | |
2770 | /* Since lockres' have the lifetime of their container | |
2771 | * (which can be inodes, ocfs2_supers, etc) we want to | |
2772 | * copy this out to a temporary lockres while still | |
2773 | * under the spinlock. Obviously after this we can't | |
2774 | * trust any pointers on the copy returned, but that's | |
2775 | * ok as the information we want isn't typically held | |
2776 | * in them. */ | |
2777 | priv->p_tmp_res = *iter; | |
2778 | iter = &priv->p_tmp_res; | |
2779 | } | |
2780 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
2781 | ||
2782 | return iter; | |
2783 | } | |
2784 | ||
2785 | static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v) | |
2786 | { | |
2787 | } | |
2788 | ||
2789 | static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
2790 | { | |
2791 | struct ocfs2_dlm_seq_priv *priv = m->private; | |
2792 | struct ocfs2_lock_res *iter = v; | |
2793 | struct ocfs2_lock_res *dummy = &priv->p_iter_res; | |
2794 | ||
2795 | spin_lock(&ocfs2_dlm_tracking_lock); | |
2796 | iter = ocfs2_dlm_next_res(iter, priv); | |
2797 | list_del_init(&dummy->l_debug_list); | |
2798 | if (iter) { | |
2799 | list_add(&dummy->l_debug_list, &iter->l_debug_list); | |
2800 | priv->p_tmp_res = *iter; | |
2801 | iter = &priv->p_tmp_res; | |
2802 | } | |
2803 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
2804 | ||
2805 | return iter; | |
2806 | } | |
2807 | ||
5bc970e8 SM |
2808 | /* |
2809 | * Version is used by debugfs.ocfs2 to determine the format being used | |
2810 | * | |
2811 | * New in version 2 | |
2812 | * - Lock stats printed | |
2813 | * New in version 3 | |
2814 | * - Max time in lock stats is in usecs (instead of nsecs) | |
2815 | */ | |
2816 | #define OCFS2_DLM_DEBUG_STR_VERSION 3 | |
ccd979bd MF |
2817 | static int ocfs2_dlm_seq_show(struct seq_file *m, void *v) |
2818 | { | |
2819 | int i; | |
2820 | char *lvb; | |
2821 | struct ocfs2_lock_res *lockres = v; | |
2822 | ||
2823 | if (!lockres) | |
2824 | return -EINVAL; | |
2825 | ||
d680efe9 MF |
2826 | seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION); |
2827 | ||
2828 | if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY) | |
2829 | seq_printf(m, "%.*s%08x\t", OCFS2_DENTRY_LOCK_INO_START - 1, | |
2830 | lockres->l_name, | |
2831 | (unsigned int)ocfs2_get_dentry_lock_ino(lockres)); | |
2832 | else | |
2833 | seq_printf(m, "%.*s\t", OCFS2_LOCK_ID_MAX_LEN, lockres->l_name); | |
2834 | ||
2835 | seq_printf(m, "%d\t" | |
ccd979bd MF |
2836 | "0x%lx\t" |
2837 | "0x%x\t" | |
2838 | "0x%x\t" | |
2839 | "%u\t" | |
2840 | "%u\t" | |
2841 | "%d\t" | |
2842 | "%d\t", | |
ccd979bd MF |
2843 | lockres->l_level, |
2844 | lockres->l_flags, | |
2845 | lockres->l_action, | |
2846 | lockres->l_unlock_action, | |
2847 | lockres->l_ro_holders, | |
2848 | lockres->l_ex_holders, | |
2849 | lockres->l_requested, | |
2850 | lockres->l_blocking); | |
2851 | ||
2852 | /* Dump the raw LVB */ | |
8f2c9c1b | 2853 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
ccd979bd MF |
2854 | for(i = 0; i < DLM_LVB_LEN; i++) |
2855 | seq_printf(m, "0x%x\t", lvb[i]); | |
2856 | ||
8ddb7b00 | 2857 | #ifdef CONFIG_OCFS2_FS_STATS |
5bc970e8 SM |
2858 | # define lock_num_prmode(_l) ((_l)->l_lock_prmode.ls_gets) |
2859 | # define lock_num_exmode(_l) ((_l)->l_lock_exmode.ls_gets) | |
2860 | # define lock_num_prmode_failed(_l) ((_l)->l_lock_prmode.ls_fail) | |
2861 | # define lock_num_exmode_failed(_l) ((_l)->l_lock_exmode.ls_fail) | |
2862 | # define lock_total_prmode(_l) ((_l)->l_lock_prmode.ls_total) | |
2863 | # define lock_total_exmode(_l) ((_l)->l_lock_exmode.ls_total) | |
2864 | # define lock_max_prmode(_l) ((_l)->l_lock_prmode.ls_max) | |
2865 | # define lock_max_exmode(_l) ((_l)->l_lock_exmode.ls_max) | |
2866 | # define lock_refresh(_l) ((_l)->l_lock_refresh) | |
8ddb7b00 | 2867 | #else |
5bc970e8 SM |
2868 | # define lock_num_prmode(_l) (0) |
2869 | # define lock_num_exmode(_l) (0) | |
8ddb7b00 SM |
2870 | # define lock_num_prmode_failed(_l) (0) |
2871 | # define lock_num_exmode_failed(_l) (0) | |
dd25e55e RD |
2872 | # define lock_total_prmode(_l) (0ULL) |
2873 | # define lock_total_exmode(_l) (0ULL) | |
8ddb7b00 SM |
2874 | # define lock_max_prmode(_l) (0) |
2875 | # define lock_max_exmode(_l) (0) | |
2876 | # define lock_refresh(_l) (0) | |
2877 | #endif | |
2878 | /* The following seq_print was added in version 2 of this output */ | |
5bc970e8 SM |
2879 | seq_printf(m, "%u\t" |
2880 | "%u\t" | |
8ddb7b00 SM |
2881 | "%u\t" |
2882 | "%u\t" | |
2883 | "%llu\t" | |
2884 | "%llu\t" | |
2885 | "%u\t" | |
2886 | "%u\t" | |
2887 | "%u\t", | |
2888 | lock_num_prmode(lockres), | |
2889 | lock_num_exmode(lockres), | |
2890 | lock_num_prmode_failed(lockres), | |
2891 | lock_num_exmode_failed(lockres), | |
2892 | lock_total_prmode(lockres), | |
2893 | lock_total_exmode(lockres), | |
2894 | lock_max_prmode(lockres), | |
2895 | lock_max_exmode(lockres), | |
2896 | lock_refresh(lockres)); | |
2897 | ||
ccd979bd MF |
2898 | /* End the line */ |
2899 | seq_printf(m, "\n"); | |
2900 | return 0; | |
2901 | } | |
2902 | ||
90d99779 | 2903 | static const struct seq_operations ocfs2_dlm_seq_ops = { |
ccd979bd MF |
2904 | .start = ocfs2_dlm_seq_start, |
2905 | .stop = ocfs2_dlm_seq_stop, | |
2906 | .next = ocfs2_dlm_seq_next, | |
2907 | .show = ocfs2_dlm_seq_show, | |
2908 | }; | |
2909 | ||
2910 | static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file) | |
2911 | { | |
33fa1d90 | 2912 | struct seq_file *seq = file->private_data; |
ccd979bd MF |
2913 | struct ocfs2_dlm_seq_priv *priv = seq->private; |
2914 | struct ocfs2_lock_res *res = &priv->p_iter_res; | |
2915 | ||
2916 | ocfs2_remove_lockres_tracking(res); | |
2917 | ocfs2_put_dlm_debug(priv->p_dlm_debug); | |
2918 | return seq_release_private(inode, file); | |
2919 | } | |
2920 | ||
2921 | static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file) | |
2922 | { | |
ccd979bd | 2923 | struct ocfs2_dlm_seq_priv *priv; |
ccd979bd MF |
2924 | struct ocfs2_super *osb; |
2925 | ||
1848cb55 | 2926 | priv = __seq_open_private(file, &ocfs2_dlm_seq_ops, sizeof(*priv)); |
ccd979bd | 2927 | if (!priv) { |
1848cb55 RJ |
2928 | mlog_errno(-ENOMEM); |
2929 | return -ENOMEM; | |
ccd979bd | 2930 | } |
1848cb55 | 2931 | |
8e18e294 | 2932 | osb = inode->i_private; |
ccd979bd MF |
2933 | ocfs2_get_dlm_debug(osb->osb_dlm_debug); |
2934 | priv->p_dlm_debug = osb->osb_dlm_debug; | |
2935 | INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list); | |
2936 | ||
ccd979bd MF |
2937 | ocfs2_add_lockres_tracking(&priv->p_iter_res, |
2938 | priv->p_dlm_debug); | |
2939 | ||
1848cb55 | 2940 | return 0; |
ccd979bd MF |
2941 | } |
2942 | ||
4b6f5d20 | 2943 | static const struct file_operations ocfs2_dlm_debug_fops = { |
ccd979bd MF |
2944 | .open = ocfs2_dlm_debug_open, |
2945 | .release = ocfs2_dlm_debug_release, | |
2946 | .read = seq_read, | |
2947 | .llseek = seq_lseek, | |
2948 | }; | |
2949 | ||
2950 | static int ocfs2_dlm_init_debug(struct ocfs2_super *osb) | |
2951 | { | |
2952 | int ret = 0; | |
2953 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; | |
2954 | ||
2955 | dlm_debug->d_locking_state = debugfs_create_file("locking_state", | |
2956 | S_IFREG|S_IRUSR, | |
2957 | osb->osb_debug_root, | |
2958 | osb, | |
2959 | &ocfs2_dlm_debug_fops); | |
8f443e23 | 2960 | if (!dlm_debug->d_locking_state) { |
ccd979bd MF |
2961 | ret = -EINVAL; |
2962 | mlog(ML_ERROR, | |
2963 | "Unable to create locking state debugfs file.\n"); | |
2964 | goto out; | |
2965 | } | |
2966 | ||
2967 | ocfs2_get_dlm_debug(dlm_debug); | |
2968 | out: | |
2969 | return ret; | |
2970 | } | |
2971 | ||
2972 | static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb) | |
2973 | { | |
2974 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; | |
2975 | ||
2976 | if (dlm_debug) { | |
2977 | debugfs_remove(dlm_debug->d_locking_state); | |
2978 | ocfs2_put_dlm_debug(dlm_debug); | |
2979 | } | |
2980 | } | |
2981 | ||
2982 | int ocfs2_dlm_init(struct ocfs2_super *osb) | |
2983 | { | |
c271c5c2 | 2984 | int status = 0; |
4670c46d | 2985 | struct ocfs2_cluster_connection *conn = NULL; |
ccd979bd | 2986 | |
0abd6d18 MF |
2987 | if (ocfs2_mount_local(osb)) { |
2988 | osb->node_num = 0; | |
c271c5c2 | 2989 | goto local; |
0abd6d18 | 2990 | } |
c271c5c2 | 2991 | |
ccd979bd MF |
2992 | status = ocfs2_dlm_init_debug(osb); |
2993 | if (status < 0) { | |
2994 | mlog_errno(status); | |
2995 | goto bail; | |
2996 | } | |
2997 | ||
34d024f8 | 2998 | /* launch downconvert thread */ |
5afc44e2 JQ |
2999 | osb->dc_task = kthread_run(ocfs2_downconvert_thread, osb, "ocfs2dc-%s", |
3000 | osb->uuid_str); | |
34d024f8 MF |
3001 | if (IS_ERR(osb->dc_task)) { |
3002 | status = PTR_ERR(osb->dc_task); | |
3003 | osb->dc_task = NULL; | |
ccd979bd MF |
3004 | mlog_errno(status); |
3005 | goto bail; | |
3006 | } | |
3007 | ||
ccd979bd | 3008 | /* for now, uuid == domain */ |
9c6c877c | 3009 | status = ocfs2_cluster_connect(osb->osb_cluster_stack, |
c74a3bdd GR |
3010 | osb->osb_cluster_name, |
3011 | strlen(osb->osb_cluster_name), | |
9c6c877c | 3012 | osb->uuid_str, |
4670c46d | 3013 | strlen(osb->uuid_str), |
553b5eb9 | 3014 | &lproto, ocfs2_do_node_down, osb, |
4670c46d JB |
3015 | &conn); |
3016 | if (status) { | |
ccd979bd MF |
3017 | mlog_errno(status); |
3018 | goto bail; | |
3019 | } | |
3020 | ||
3e834151 | 3021 | status = ocfs2_cluster_this_node(conn, &osb->node_num); |
0abd6d18 MF |
3022 | if (status < 0) { |
3023 | mlog_errno(status); | |
3024 | mlog(ML_ERROR, | |
3025 | "could not find this host's node number\n"); | |
286eaa95 | 3026 | ocfs2_cluster_disconnect(conn, 0); |
0abd6d18 MF |
3027 | goto bail; |
3028 | } | |
3029 | ||
c271c5c2 | 3030 | local: |
ccd979bd MF |
3031 | ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb); |
3032 | ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb); | |
6ca497a8 | 3033 | ocfs2_nfs_sync_lock_res_init(&osb->osb_nfs_sync_lockres, osb); |
83273932 | 3034 | ocfs2_orphan_scan_lock_res_init(&osb->osb_orphan_scan.os_lockres, osb); |
ccd979bd | 3035 | |
4670c46d | 3036 | osb->cconn = conn; |
ccd979bd MF |
3037 | bail: |
3038 | if (status < 0) { | |
3039 | ocfs2_dlm_shutdown_debug(osb); | |
34d024f8 MF |
3040 | if (osb->dc_task) |
3041 | kthread_stop(osb->dc_task); | |
ccd979bd MF |
3042 | } |
3043 | ||
ccd979bd MF |
3044 | return status; |
3045 | } | |
3046 | ||
286eaa95 JB |
3047 | void ocfs2_dlm_shutdown(struct ocfs2_super *osb, |
3048 | int hangup_pending) | |
ccd979bd | 3049 | { |
ccd979bd MF |
3050 | ocfs2_drop_osb_locks(osb); |
3051 | ||
4670c46d JB |
3052 | /* |
3053 | * Now that we have dropped all locks and ocfs2_dismount_volume() | |
3054 | * has disabled recovery, the DLM won't be talking to us. It's | |
3055 | * safe to tear things down before disconnecting the cluster. | |
3056 | */ | |
3057 | ||
34d024f8 MF |
3058 | if (osb->dc_task) { |
3059 | kthread_stop(osb->dc_task); | |
3060 | osb->dc_task = NULL; | |
ccd979bd MF |
3061 | } |
3062 | ||
3063 | ocfs2_lock_res_free(&osb->osb_super_lockres); | |
3064 | ocfs2_lock_res_free(&osb->osb_rename_lockres); | |
6ca497a8 | 3065 | ocfs2_lock_res_free(&osb->osb_nfs_sync_lockres); |
83273932 | 3066 | ocfs2_lock_res_free(&osb->osb_orphan_scan.os_lockres); |
ccd979bd | 3067 | |
286eaa95 | 3068 | ocfs2_cluster_disconnect(osb->cconn, hangup_pending); |
4670c46d | 3069 | osb->cconn = NULL; |
ccd979bd MF |
3070 | |
3071 | ocfs2_dlm_shutdown_debug(osb); | |
ccd979bd MF |
3072 | } |
3073 | ||
ccd979bd | 3074 | static int ocfs2_drop_lock(struct ocfs2_super *osb, |
0d5dc6c2 | 3075 | struct ocfs2_lock_res *lockres) |
ccd979bd | 3076 | { |
7431cd7e | 3077 | int ret; |
ccd979bd | 3078 | unsigned long flags; |
bd3e7610 | 3079 | u32 lkm_flags = 0; |
ccd979bd MF |
3080 | |
3081 | /* We didn't get anywhere near actually using this lockres. */ | |
3082 | if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) | |
3083 | goto out; | |
3084 | ||
b80fc012 | 3085 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
bd3e7610 | 3086 | lkm_flags |= DLM_LKF_VALBLK; |
b80fc012 | 3087 | |
ccd979bd MF |
3088 | spin_lock_irqsave(&lockres->l_lock, flags); |
3089 | ||
3090 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING), | |
3091 | "lockres %s, flags 0x%lx\n", | |
3092 | lockres->l_name, lockres->l_flags); | |
3093 | ||
3094 | while (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
3095 | mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = " | |
3096 | "%u, unlock_action = %u\n", | |
3097 | lockres->l_name, lockres->l_flags, lockres->l_action, | |
3098 | lockres->l_unlock_action); | |
3099 | ||
3100 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3101 | ||
3102 | /* XXX: Today we just wait on any busy | |
3103 | * locks... Perhaps we need to cancel converts in the | |
3104 | * future? */ | |
3105 | ocfs2_wait_on_busy_lock(lockres); | |
3106 | ||
3107 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3108 | } | |
3109 | ||
0d5dc6c2 MF |
3110 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) { |
3111 | if (lockres->l_flags & OCFS2_LOCK_ATTACHED && | |
bd3e7610 | 3112 | lockres->l_level == DLM_LOCK_EX && |
0d5dc6c2 MF |
3113 | !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) |
3114 | lockres->l_ops->set_lvb(lockres); | |
3115 | } | |
ccd979bd MF |
3116 | |
3117 | if (lockres->l_flags & OCFS2_LOCK_BUSY) | |
3118 | mlog(ML_ERROR, "destroying busy lock: \"%s\"\n", | |
3119 | lockres->l_name); | |
3120 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) | |
3121 | mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name); | |
3122 | ||
3123 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { | |
3124 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3125 | goto out; | |
3126 | } | |
3127 | ||
3128 | lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED); | |
3129 | ||
3130 | /* make sure we never get here while waiting for an ast to | |
3131 | * fire. */ | |
3132 | BUG_ON(lockres->l_action != OCFS2_AST_INVALID); | |
3133 | ||
3134 | /* is this necessary? */ | |
3135 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
3136 | lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK; | |
3137 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3138 | ||
3139 | mlog(0, "lock %s\n", lockres->l_name); | |
3140 | ||
a796d286 | 3141 | ret = ocfs2_dlm_unlock(osb->cconn, &lockres->l_lksb, lkm_flags); |
7431cd7e JB |
3142 | if (ret) { |
3143 | ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres); | |
ccd979bd | 3144 | mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags); |
cf0acdcd | 3145 | ocfs2_dlm_dump_lksb(&lockres->l_lksb); |
ccd979bd MF |
3146 | BUG(); |
3147 | } | |
73ac36ea | 3148 | mlog(0, "lock %s, successful return from ocfs2_dlm_unlock\n", |
ccd979bd MF |
3149 | lockres->l_name); |
3150 | ||
3151 | ocfs2_wait_on_busy_lock(lockres); | |
3152 | out: | |
ccd979bd MF |
3153 | return 0; |
3154 | } | |
3155 | ||
84d86f83 JK |
3156 | static void ocfs2_process_blocked_lock(struct ocfs2_super *osb, |
3157 | struct ocfs2_lock_res *lockres); | |
3158 | ||
ccd979bd MF |
3159 | /* Mark the lockres as being dropped. It will no longer be |
3160 | * queued if blocking, but we still may have to wait on it | |
34d024f8 | 3161 | * being dequeued from the downconvert thread before we can consider |
2bd63216 | 3162 | * it safe to drop. |
ccd979bd MF |
3163 | * |
3164 | * You can *not* attempt to call cluster_lock on this lockres anymore. */ | |
84d86f83 JK |
3165 | void ocfs2_mark_lockres_freeing(struct ocfs2_super *osb, |
3166 | struct ocfs2_lock_res *lockres) | |
ccd979bd MF |
3167 | { |
3168 | int status; | |
3169 | struct ocfs2_mask_waiter mw; | |
84d86f83 | 3170 | unsigned long flags, flags2; |
ccd979bd MF |
3171 | |
3172 | ocfs2_init_mask_waiter(&mw); | |
3173 | ||
3174 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3175 | lockres->l_flags |= OCFS2_LOCK_FREEING; | |
84d86f83 JK |
3176 | if (lockres->l_flags & OCFS2_LOCK_QUEUED && current == osb->dc_task) { |
3177 | /* | |
3178 | * We know the downconvert is queued but not in progress | |
3179 | * because we are the downconvert thread and processing | |
3180 | * different lock. So we can just remove the lock from the | |
3181 | * queue. This is not only an optimization but also a way | |
3182 | * to avoid the following deadlock: | |
3183 | * ocfs2_dentry_post_unlock() | |
3184 | * ocfs2_dentry_lock_put() | |
3185 | * ocfs2_drop_dentry_lock() | |
3186 | * iput() | |
3187 | * ocfs2_evict_inode() | |
3188 | * ocfs2_clear_inode() | |
3189 | * ocfs2_mark_lockres_freeing() | |
3190 | * ... blocks waiting for OCFS2_LOCK_QUEUED | |
3191 | * since we are the downconvert thread which | |
3192 | * should clear the flag. | |
3193 | */ | |
3194 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3195 | spin_lock_irqsave(&osb->dc_task_lock, flags2); | |
3196 | list_del_init(&lockres->l_blocked_list); | |
3197 | osb->blocked_lock_count--; | |
3198 | spin_unlock_irqrestore(&osb->dc_task_lock, flags2); | |
3199 | /* | |
3200 | * Warn if we recurse into another post_unlock call. Strictly | |
3201 | * speaking it isn't a problem but we need to be careful if | |
3202 | * that happens (stack overflow, deadlocks, ...) so warn if | |
3203 | * ocfs2 grows a path for which this can happen. | |
3204 | */ | |
3205 | WARN_ON_ONCE(lockres->l_ops->post_unlock); | |
3206 | /* Since the lock is freeing we don't do much in the fn below */ | |
3207 | ocfs2_process_blocked_lock(osb, lockres); | |
3208 | return; | |
3209 | } | |
ccd979bd MF |
3210 | while (lockres->l_flags & OCFS2_LOCK_QUEUED) { |
3211 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0); | |
3212 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3213 | ||
3214 | mlog(0, "Waiting on lockres %s\n", lockres->l_name); | |
3215 | ||
3216 | status = ocfs2_wait_for_mask(&mw); | |
3217 | if (status) | |
3218 | mlog_errno(status); | |
3219 | ||
3220 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3221 | } | |
3222 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3223 | } | |
3224 | ||
d680efe9 MF |
3225 | void ocfs2_simple_drop_lockres(struct ocfs2_super *osb, |
3226 | struct ocfs2_lock_res *lockres) | |
ccd979bd | 3227 | { |
d680efe9 | 3228 | int ret; |
ccd979bd | 3229 | |
84d86f83 | 3230 | ocfs2_mark_lockres_freeing(osb, lockres); |
0d5dc6c2 | 3231 | ret = ocfs2_drop_lock(osb, lockres); |
d680efe9 MF |
3232 | if (ret) |
3233 | mlog_errno(ret); | |
3234 | } | |
ccd979bd | 3235 | |
d680efe9 MF |
3236 | static void ocfs2_drop_osb_locks(struct ocfs2_super *osb) |
3237 | { | |
3238 | ocfs2_simple_drop_lockres(osb, &osb->osb_super_lockres); | |
3239 | ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres); | |
6ca497a8 | 3240 | ocfs2_simple_drop_lockres(osb, &osb->osb_nfs_sync_lockres); |
83273932 | 3241 | ocfs2_simple_drop_lockres(osb, &osb->osb_orphan_scan.os_lockres); |
ccd979bd MF |
3242 | } |
3243 | ||
ccd979bd MF |
3244 | int ocfs2_drop_inode_locks(struct inode *inode) |
3245 | { | |
3246 | int status, err; | |
ccd979bd | 3247 | |
ccd979bd MF |
3248 | /* No need to call ocfs2_mark_lockres_freeing here - |
3249 | * ocfs2_clear_inode has done it for us. */ | |
3250 | ||
3251 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
50008630 | 3252 | &OCFS2_I(inode)->ip_open_lockres); |
ccd979bd MF |
3253 | if (err < 0) |
3254 | mlog_errno(err); | |
3255 | ||
3256 | status = err; | |
3257 | ||
3258 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
e63aecb6 | 3259 | &OCFS2_I(inode)->ip_inode_lockres); |
ccd979bd MF |
3260 | if (err < 0) |
3261 | mlog_errno(err); | |
3262 | if (err < 0 && !status) | |
3263 | status = err; | |
3264 | ||
3265 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
0d5dc6c2 | 3266 | &OCFS2_I(inode)->ip_rw_lockres); |
ccd979bd MF |
3267 | if (err < 0) |
3268 | mlog_errno(err); | |
3269 | if (err < 0 && !status) | |
3270 | status = err; | |
3271 | ||
ccd979bd MF |
3272 | return status; |
3273 | } | |
3274 | ||
de551246 JB |
3275 | static unsigned int ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres, |
3276 | int new_level) | |
ccd979bd MF |
3277 | { |
3278 | assert_spin_locked(&lockres->l_lock); | |
3279 | ||
bd3e7610 | 3280 | BUG_ON(lockres->l_blocking <= DLM_LOCK_NL); |
ccd979bd MF |
3281 | |
3282 | if (lockres->l_level <= new_level) { | |
9b915181 SM |
3283 | mlog(ML_ERROR, "lockres %s, lvl %d <= %d, blcklst %d, mask %d, " |
3284 | "type %d, flags 0x%lx, hold %d %d, act %d %d, req %d, " | |
3285 | "block %d, pgen %d\n", lockres->l_name, lockres->l_level, | |
3286 | new_level, list_empty(&lockres->l_blocked_list), | |
3287 | list_empty(&lockres->l_mask_waiters), lockres->l_type, | |
3288 | lockres->l_flags, lockres->l_ro_holders, | |
3289 | lockres->l_ex_holders, lockres->l_action, | |
3290 | lockres->l_unlock_action, lockres->l_requested, | |
3291 | lockres->l_blocking, lockres->l_pending_gen); | |
ccd979bd MF |
3292 | BUG(); |
3293 | } | |
3294 | ||
9b915181 SM |
3295 | mlog(ML_BASTS, "lockres %s, level %d => %d, blocking %d\n", |
3296 | lockres->l_name, lockres->l_level, new_level, lockres->l_blocking); | |
ccd979bd MF |
3297 | |
3298 | lockres->l_action = OCFS2_AST_DOWNCONVERT; | |
3299 | lockres->l_requested = new_level; | |
3300 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
de551246 | 3301 | return lockres_set_pending(lockres); |
ccd979bd MF |
3302 | } |
3303 | ||
3304 | static int ocfs2_downconvert_lock(struct ocfs2_super *osb, | |
3305 | struct ocfs2_lock_res *lockres, | |
3306 | int new_level, | |
de551246 JB |
3307 | int lvb, |
3308 | unsigned int generation) | |
ccd979bd | 3309 | { |
bd3e7610 JB |
3310 | int ret; |
3311 | u32 dlm_flags = DLM_LKF_CONVERT; | |
ccd979bd | 3312 | |
9b915181 SM |
3313 | mlog(ML_BASTS, "lockres %s, level %d => %d\n", lockres->l_name, |
3314 | lockres->l_level, new_level); | |
3315 | ||
ccd979bd | 3316 | if (lvb) |
bd3e7610 | 3317 | dlm_flags |= DLM_LKF_VALBLK; |
ccd979bd | 3318 | |
4670c46d | 3319 | ret = ocfs2_dlm_lock(osb->cconn, |
7431cd7e JB |
3320 | new_level, |
3321 | &lockres->l_lksb, | |
3322 | dlm_flags, | |
3323 | lockres->l_name, | |
a796d286 | 3324 | OCFS2_LOCK_ID_MAX_LEN - 1); |
de551246 | 3325 | lockres_clear_pending(lockres, generation, osb); |
7431cd7e JB |
3326 | if (ret) { |
3327 | ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres); | |
ccd979bd MF |
3328 | ocfs2_recover_from_dlm_error(lockres, 1); |
3329 | goto bail; | |
3330 | } | |
3331 | ||
3332 | ret = 0; | |
3333 | bail: | |
ccd979bd MF |
3334 | return ret; |
3335 | } | |
3336 | ||
24ef1815 | 3337 | /* returns 1 when the caller should unlock and call ocfs2_dlm_unlock */ |
ccd979bd MF |
3338 | static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb, |
3339 | struct ocfs2_lock_res *lockres) | |
3340 | { | |
3341 | assert_spin_locked(&lockres->l_lock); | |
3342 | ||
ccd979bd MF |
3343 | if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { |
3344 | /* If we're already trying to cancel a lock conversion | |
3345 | * then just drop the spinlock and allow the caller to | |
3346 | * requeue this lock. */ | |
9b915181 | 3347 | mlog(ML_BASTS, "lockres %s, skip convert\n", lockres->l_name); |
ccd979bd MF |
3348 | return 0; |
3349 | } | |
3350 | ||
3351 | /* were we in a convert when we got the bast fire? */ | |
3352 | BUG_ON(lockres->l_action != OCFS2_AST_CONVERT && | |
3353 | lockres->l_action != OCFS2_AST_DOWNCONVERT); | |
3354 | /* set things up for the unlockast to know to just | |
3355 | * clear out the ast_action and unset busy, etc. */ | |
3356 | lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT; | |
3357 | ||
3358 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY), | |
3359 | "lock %s, invalid flags: 0x%lx\n", | |
3360 | lockres->l_name, lockres->l_flags); | |
3361 | ||
9b915181 SM |
3362 | mlog(ML_BASTS, "lockres %s\n", lockres->l_name); |
3363 | ||
ccd979bd MF |
3364 | return 1; |
3365 | } | |
3366 | ||
3367 | static int ocfs2_cancel_convert(struct ocfs2_super *osb, | |
3368 | struct ocfs2_lock_res *lockres) | |
3369 | { | |
3370 | int ret; | |
ccd979bd | 3371 | |
4670c46d | 3372 | ret = ocfs2_dlm_unlock(osb->cconn, &lockres->l_lksb, |
a796d286 | 3373 | DLM_LKF_CANCEL); |
7431cd7e JB |
3374 | if (ret) { |
3375 | ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres); | |
ccd979bd MF |
3376 | ocfs2_recover_from_dlm_error(lockres, 0); |
3377 | } | |
3378 | ||
9b915181 | 3379 | mlog(ML_BASTS, "lockres %s\n", lockres->l_name); |
ccd979bd | 3380 | |
ccd979bd MF |
3381 | return ret; |
3382 | } | |
3383 | ||
b5e500e2 MF |
3384 | static int ocfs2_unblock_lock(struct ocfs2_super *osb, |
3385 | struct ocfs2_lock_res *lockres, | |
3386 | struct ocfs2_unblock_ctl *ctl) | |
ccd979bd MF |
3387 | { |
3388 | unsigned long flags; | |
3389 | int blocking; | |
3390 | int new_level; | |
079b8057 | 3391 | int level; |
ccd979bd | 3392 | int ret = 0; |
5ef0d4ea | 3393 | int set_lvb = 0; |
de551246 | 3394 | unsigned int gen; |
ccd979bd | 3395 | |
ccd979bd MF |
3396 | spin_lock_irqsave(&lockres->l_lock, flags); |
3397 | ||
ccd979bd | 3398 | recheck: |
db0f6ce6 SM |
3399 | /* |
3400 | * Is it still blocking? If not, we have no more work to do. | |
3401 | */ | |
3402 | if (!(lockres->l_flags & OCFS2_LOCK_BLOCKED)) { | |
3403 | BUG_ON(lockres->l_blocking != DLM_LOCK_NL); | |
3404 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3405 | ret = 0; | |
3406 | goto leave; | |
3407 | } | |
3408 | ||
ccd979bd | 3409 | if (lockres->l_flags & OCFS2_LOCK_BUSY) { |
de551246 JB |
3410 | /* XXX |
3411 | * This is a *big* race. The OCFS2_LOCK_PENDING flag | |
3412 | * exists entirely for one reason - another thread has set | |
3413 | * OCFS2_LOCK_BUSY, but has *NOT* yet called dlm_lock(). | |
3414 | * | |
3415 | * If we do ocfs2_cancel_convert() before the other thread | |
3416 | * calls dlm_lock(), our cancel will do nothing. We will | |
3417 | * get no ast, and we will have no way of knowing the | |
3418 | * cancel failed. Meanwhile, the other thread will call | |
3419 | * into dlm_lock() and wait...forever. | |
3420 | * | |
3421 | * Why forever? Because another node has asked for the | |
3422 | * lock first; that's why we're here in unblock_lock(). | |
3423 | * | |
3424 | * The solution is OCFS2_LOCK_PENDING. When PENDING is | |
3425 | * set, we just requeue the unblock. Only when the other | |
3426 | * thread has called dlm_lock() and cleared PENDING will | |
3427 | * we then cancel their request. | |
3428 | * | |
3429 | * All callers of dlm_lock() must set OCFS2_DLM_PENDING | |
3430 | * at the same time they set OCFS2_DLM_BUSY. They must | |
3431 | * clear OCFS2_DLM_PENDING after dlm_lock() returns. | |
3432 | */ | |
9b915181 SM |
3433 | if (lockres->l_flags & OCFS2_LOCK_PENDING) { |
3434 | mlog(ML_BASTS, "lockres %s, ReQ: Pending\n", | |
3435 | lockres->l_name); | |
de551246 | 3436 | goto leave_requeue; |
9b915181 | 3437 | } |
de551246 | 3438 | |
d680efe9 | 3439 | ctl->requeue = 1; |
ccd979bd MF |
3440 | ret = ocfs2_prepare_cancel_convert(osb, lockres); |
3441 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3442 | if (ret) { | |
3443 | ret = ocfs2_cancel_convert(osb, lockres); | |
3444 | if (ret < 0) | |
3445 | mlog_errno(ret); | |
3446 | } | |
3447 | goto leave; | |
3448 | } | |
3449 | ||
a1912826 SM |
3450 | /* |
3451 | * This prevents livelocks. OCFS2_LOCK_UPCONVERT_FINISHING flag is | |
3452 | * set when the ast is received for an upconvert just before the | |
3453 | * OCFS2_LOCK_BUSY flag is cleared. Now if the fs received a bast | |
3454 | * on the heels of the ast, we want to delay the downconvert just | |
3455 | * enough to allow the up requestor to do its task. Because this | |
3456 | * lock is in the blocked queue, the lock will be downconverted | |
3457 | * as soon as the requestor is done with the lock. | |
3458 | */ | |
3459 | if (lockres->l_flags & OCFS2_LOCK_UPCONVERT_FINISHING) | |
3460 | goto leave_requeue; | |
3461 | ||
0d74125a SM |
3462 | /* |
3463 | * How can we block and yet be at NL? We were trying to upconvert | |
3464 | * from NL and got canceled. The code comes back here, and now | |
3465 | * we notice and clear BLOCKING. | |
3466 | */ | |
3467 | if (lockres->l_level == DLM_LOCK_NL) { | |
3468 | BUG_ON(lockres->l_ex_holders || lockres->l_ro_holders); | |
9b915181 | 3469 | mlog(ML_BASTS, "lockres %s, Aborting dc\n", lockres->l_name); |
0d74125a SM |
3470 | lockres->l_blocking = DLM_LOCK_NL; |
3471 | lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED); | |
3472 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3473 | goto leave; | |
3474 | } | |
3475 | ||
ccd979bd MF |
3476 | /* if we're blocking an exclusive and we have *any* holders, |
3477 | * then requeue. */ | |
bd3e7610 | 3478 | if ((lockres->l_blocking == DLM_LOCK_EX) |
9b915181 SM |
3479 | && (lockres->l_ex_holders || lockres->l_ro_holders)) { |
3480 | mlog(ML_BASTS, "lockres %s, ReQ: EX/PR Holders %u,%u\n", | |
3481 | lockres->l_name, lockres->l_ex_holders, | |
3482 | lockres->l_ro_holders); | |
f7fbfdd1 | 3483 | goto leave_requeue; |
9b915181 | 3484 | } |
ccd979bd MF |
3485 | |
3486 | /* If it's a PR we're blocking, then only | |
3487 | * requeue if we've got any EX holders */ | |
bd3e7610 | 3488 | if (lockres->l_blocking == DLM_LOCK_PR && |
9b915181 SM |
3489 | lockres->l_ex_holders) { |
3490 | mlog(ML_BASTS, "lockres %s, ReQ: EX Holders %u\n", | |
3491 | lockres->l_name, lockres->l_ex_holders); | |
f7fbfdd1 | 3492 | goto leave_requeue; |
9b915181 | 3493 | } |
f7fbfdd1 MF |
3494 | |
3495 | /* | |
3496 | * Can we get a lock in this state if the holder counts are | |
3497 | * zero? The meta data unblock code used to check this. | |
3498 | */ | |
3499 | if ((lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) | |
9b915181 SM |
3500 | && (lockres->l_flags & OCFS2_LOCK_REFRESHING)) { |
3501 | mlog(ML_BASTS, "lockres %s, ReQ: Lock Refreshing\n", | |
3502 | lockres->l_name); | |
f7fbfdd1 | 3503 | goto leave_requeue; |
9b915181 | 3504 | } |
ccd979bd | 3505 | |
16d5b956 MF |
3506 | new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking); |
3507 | ||
3508 | if (lockres->l_ops->check_downconvert | |
9b915181 SM |
3509 | && !lockres->l_ops->check_downconvert(lockres, new_level)) { |
3510 | mlog(ML_BASTS, "lockres %s, ReQ: Checkpointing\n", | |
3511 | lockres->l_name); | |
16d5b956 | 3512 | goto leave_requeue; |
9b915181 | 3513 | } |
16d5b956 | 3514 | |
ccd979bd MF |
3515 | /* If we get here, then we know that there are no more |
3516 | * incompatible holders (and anyone asking for an incompatible | |
3517 | * lock is blocked). We can now downconvert the lock */ | |
cc567d89 | 3518 | if (!lockres->l_ops->downconvert_worker) |
ccd979bd MF |
3519 | goto downconvert; |
3520 | ||
3521 | /* Some lockres types want to do a bit of work before | |
3522 | * downconverting a lock. Allow that here. The worker function | |
3523 | * may sleep, so we save off a copy of what we're blocking as | |
3524 | * it may change while we're not holding the spin lock. */ | |
3525 | blocking = lockres->l_blocking; | |
079b8057 | 3526 | level = lockres->l_level; |
ccd979bd MF |
3527 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
3528 | ||
cc567d89 | 3529 | ctl->unblock_action = lockres->l_ops->downconvert_worker(lockres, blocking); |
d680efe9 | 3530 | |
9b915181 SM |
3531 | if (ctl->unblock_action == UNBLOCK_STOP_POST) { |
3532 | mlog(ML_BASTS, "lockres %s, UNBLOCK_STOP_POST\n", | |
3533 | lockres->l_name); | |
d680efe9 | 3534 | goto leave; |
9b915181 | 3535 | } |
ccd979bd MF |
3536 | |
3537 | spin_lock_irqsave(&lockres->l_lock, flags); | |
079b8057 | 3538 | if ((blocking != lockres->l_blocking) || (level != lockres->l_level)) { |
ccd979bd MF |
3539 | /* If this changed underneath us, then we can't drop |
3540 | * it just yet. */ | |
9b915181 SM |
3541 | mlog(ML_BASTS, "lockres %s, block=%d:%d, level=%d:%d, " |
3542 | "Recheck\n", lockres->l_name, blocking, | |
3543 | lockres->l_blocking, level, lockres->l_level); | |
ccd979bd MF |
3544 | goto recheck; |
3545 | } | |
3546 | ||
3547 | downconvert: | |
d680efe9 | 3548 | ctl->requeue = 0; |
ccd979bd | 3549 | |
5ef0d4ea | 3550 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) { |
bd3e7610 | 3551 | if (lockres->l_level == DLM_LOCK_EX) |
5ef0d4ea MF |
3552 | set_lvb = 1; |
3553 | ||
3554 | /* | |
3555 | * We only set the lvb if the lock has been fully | |
3556 | * refreshed - otherwise we risk setting stale | |
3557 | * data. Otherwise, there's no need to actually clear | |
3558 | * out the lvb here as it's value is still valid. | |
3559 | */ | |
3560 | if (set_lvb && !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) | |
3561 | lockres->l_ops->set_lvb(lockres); | |
3562 | } | |
3563 | ||
de551246 | 3564 | gen = ocfs2_prepare_downconvert(lockres, new_level); |
ccd979bd | 3565 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
de551246 JB |
3566 | ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb, |
3567 | gen); | |
3568 | ||
ccd979bd | 3569 | leave: |
c1e8d35e TM |
3570 | if (ret) |
3571 | mlog_errno(ret); | |
ccd979bd | 3572 | return ret; |
f7fbfdd1 MF |
3573 | |
3574 | leave_requeue: | |
3575 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3576 | ctl->requeue = 1; | |
3577 | ||
f7fbfdd1 | 3578 | return 0; |
ccd979bd MF |
3579 | } |
3580 | ||
d680efe9 MF |
3581 | static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, |
3582 | int blocking) | |
ccd979bd MF |
3583 | { |
3584 | struct inode *inode; | |
3585 | struct address_space *mapping; | |
5e98d492 | 3586 | struct ocfs2_inode_info *oi; |
ccd979bd | 3587 | |
ccd979bd MF |
3588 | inode = ocfs2_lock_res_inode(lockres); |
3589 | mapping = inode->i_mapping; | |
3590 | ||
5e98d492 GR |
3591 | if (S_ISDIR(inode->i_mode)) { |
3592 | oi = OCFS2_I(inode); | |
3593 | oi->ip_dir_lock_gen++; | |
3594 | mlog(0, "generation: %u\n", oi->ip_dir_lock_gen); | |
3595 | goto out; | |
3596 | } | |
3597 | ||
1044e401 | 3598 | if (!S_ISREG(inode->i_mode)) |
f1f54068 MF |
3599 | goto out; |
3600 | ||
7f4a2a97 MF |
3601 | /* |
3602 | * We need this before the filemap_fdatawrite() so that it can | |
3603 | * transfer the dirty bit from the PTE to the | |
3604 | * page. Unfortunately this means that even for EX->PR | |
3605 | * downconverts, we'll lose our mappings and have to build | |
3606 | * them up again. | |
3607 | */ | |
3608 | unmap_mapping_range(mapping, 0, 0, 0); | |
3609 | ||
ccd979bd | 3610 | if (filemap_fdatawrite(mapping)) { |
b0697053 MF |
3611 | mlog(ML_ERROR, "Could not sync inode %llu for downconvert!", |
3612 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
ccd979bd MF |
3613 | } |
3614 | sync_mapping_buffers(mapping); | |
bd3e7610 | 3615 | if (blocking == DLM_LOCK_EX) { |
ccd979bd | 3616 | truncate_inode_pages(mapping, 0); |
ccd979bd MF |
3617 | } else { |
3618 | /* We only need to wait on the I/O if we're not also | |
3619 | * truncating pages because truncate_inode_pages waits | |
3620 | * for us above. We don't truncate pages if we're | |
3621 | * blocking anything < EXMODE because we want to keep | |
3622 | * them around in that case. */ | |
3623 | filemap_fdatawait(mapping); | |
3624 | } | |
3625 | ||
f1f54068 | 3626 | out: |
d680efe9 | 3627 | return UNBLOCK_CONTINUE; |
ccd979bd MF |
3628 | } |
3629 | ||
a4338481 TM |
3630 | static int ocfs2_ci_checkpointed(struct ocfs2_caching_info *ci, |
3631 | struct ocfs2_lock_res *lockres, | |
3632 | int new_level) | |
810d5aeb | 3633 | { |
a4338481 | 3634 | int checkpointed = ocfs2_ci_fully_checkpointed(ci); |
810d5aeb | 3635 | |
bd3e7610 JB |
3636 | BUG_ON(new_level != DLM_LOCK_NL && new_level != DLM_LOCK_PR); |
3637 | BUG_ON(lockres->l_level != DLM_LOCK_EX && !checkpointed); | |
810d5aeb MF |
3638 | |
3639 | if (checkpointed) | |
3640 | return 1; | |
3641 | ||
a4338481 | 3642 | ocfs2_start_checkpoint(OCFS2_SB(ocfs2_metadata_cache_get_super(ci))); |
810d5aeb MF |
3643 | return 0; |
3644 | } | |
3645 | ||
a4338481 TM |
3646 | static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres, |
3647 | int new_level) | |
3648 | { | |
3649 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
3650 | ||
3651 | return ocfs2_ci_checkpointed(INODE_CACHE(inode), lockres, new_level); | |
3652 | } | |
3653 | ||
810d5aeb MF |
3654 | static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres) |
3655 | { | |
3656 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
3657 | ||
3658 | __ocfs2_stuff_meta_lvb(inode); | |
3659 | } | |
3660 | ||
d680efe9 MF |
3661 | /* |
3662 | * Does the final reference drop on our dentry lock. Right now this | |
34d024f8 | 3663 | * happens in the downconvert thread, but we could choose to simplify the |
d680efe9 MF |
3664 | * dlmglue API and push these off to the ocfs2_wq in the future. |
3665 | */ | |
3666 | static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, | |
3667 | struct ocfs2_lock_res *lockres) | |
3668 | { | |
3669 | struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); | |
3670 | ocfs2_dentry_lock_put(osb, dl); | |
3671 | } | |
3672 | ||
3673 | /* | |
3674 | * d_delete() matching dentries before the lock downconvert. | |
3675 | * | |
3676 | * At this point, any process waiting to destroy the | |
3677 | * dentry_lock due to last ref count is stopped by the | |
3678 | * OCFS2_LOCK_QUEUED flag. | |
3679 | * | |
3680 | * We have two potential problems | |
3681 | * | |
3682 | * 1) If we do the last reference drop on our dentry_lock (via dput) | |
3683 | * we'll wind up in ocfs2_release_dentry_lock(), waiting on | |
3684 | * the downconvert to finish. Instead we take an elevated | |
3685 | * reference and push the drop until after we've completed our | |
3686 | * unblock processing. | |
3687 | * | |
3688 | * 2) There might be another process with a final reference, | |
3689 | * waiting on us to finish processing. If this is the case, we | |
3690 | * detect it and exit out - there's no more dentries anyway. | |
3691 | */ | |
3692 | static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, | |
3693 | int blocking) | |
3694 | { | |
3695 | struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); | |
3696 | struct ocfs2_inode_info *oi = OCFS2_I(dl->dl_inode); | |
3697 | struct dentry *dentry; | |
3698 | unsigned long flags; | |
3699 | int extra_ref = 0; | |
3700 | ||
3701 | /* | |
3702 | * This node is blocking another node from getting a read | |
3703 | * lock. This happens when we've renamed within a | |
3704 | * directory. We've forced the other nodes to d_delete(), but | |
3705 | * we never actually dropped our lock because it's still | |
3706 | * valid. The downconvert code will retain a PR for this node, | |
3707 | * so there's no further work to do. | |
3708 | */ | |
bd3e7610 | 3709 | if (blocking == DLM_LOCK_PR) |
d680efe9 MF |
3710 | return UNBLOCK_CONTINUE; |
3711 | ||
3712 | /* | |
3713 | * Mark this inode as potentially orphaned. The code in | |
3714 | * ocfs2_delete_inode() will figure out whether it actually | |
3715 | * needs to be freed or not. | |
3716 | */ | |
3717 | spin_lock(&oi->ip_lock); | |
3718 | oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED; | |
3719 | spin_unlock(&oi->ip_lock); | |
3720 | ||
3721 | /* | |
3722 | * Yuck. We need to make sure however that the check of | |
3723 | * OCFS2_LOCK_FREEING and the extra reference are atomic with | |
3724 | * respect to a reference decrement or the setting of that | |
3725 | * flag. | |
3726 | */ | |
3727 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3728 | spin_lock(&dentry_attach_lock); | |
3729 | if (!(lockres->l_flags & OCFS2_LOCK_FREEING) | |
3730 | && dl->dl_count) { | |
3731 | dl->dl_count++; | |
3732 | extra_ref = 1; | |
3733 | } | |
3734 | spin_unlock(&dentry_attach_lock); | |
3735 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3736 | ||
3737 | mlog(0, "extra_ref = %d\n", extra_ref); | |
3738 | ||
3739 | /* | |
3740 | * We have a process waiting on us in ocfs2_dentry_iput(), | |
3741 | * which means we can't have any more outstanding | |
3742 | * aliases. There's no need to do any more work. | |
3743 | */ | |
3744 | if (!extra_ref) | |
3745 | return UNBLOCK_CONTINUE; | |
3746 | ||
3747 | spin_lock(&dentry_attach_lock); | |
3748 | while (1) { | |
3749 | dentry = ocfs2_find_local_alias(dl->dl_inode, | |
3750 | dl->dl_parent_blkno, 1); | |
3751 | if (!dentry) | |
3752 | break; | |
3753 | spin_unlock(&dentry_attach_lock); | |
3754 | ||
10ab8811 | 3755 | if (S_ISDIR(dl->dl_inode->i_mode)) |
3756 | shrink_dcache_parent(dentry); | |
3757 | ||
a455589f | 3758 | mlog(0, "d_delete(%pd);\n", dentry); |
d680efe9 MF |
3759 | |
3760 | /* | |
3761 | * The following dcache calls may do an | |
3762 | * iput(). Normally we don't want that from the | |
3763 | * downconverting thread, but in this case it's ok | |
3764 | * because the requesting node already has an | |
3765 | * exclusive lock on the inode, so it can't be queued | |
3766 | * for a downconvert. | |
3767 | */ | |
3768 | d_delete(dentry); | |
3769 | dput(dentry); | |
3770 | ||
3771 | spin_lock(&dentry_attach_lock); | |
3772 | } | |
3773 | spin_unlock(&dentry_attach_lock); | |
3774 | ||
3775 | /* | |
3776 | * If we are the last holder of this dentry lock, there is no | |
3777 | * reason to downconvert so skip straight to the unlock. | |
3778 | */ | |
3779 | if (dl->dl_count == 1) | |
3780 | return UNBLOCK_STOP_POST; | |
3781 | ||
3782 | return UNBLOCK_CONTINUE_POST; | |
3783 | } | |
3784 | ||
8dec98ed TM |
3785 | static int ocfs2_check_refcount_downconvert(struct ocfs2_lock_res *lockres, |
3786 | int new_level) | |
3787 | { | |
3788 | struct ocfs2_refcount_tree *tree = | |
3789 | ocfs2_lock_res_refcount_tree(lockres); | |
3790 | ||
3791 | return ocfs2_ci_checkpointed(&tree->rf_ci, lockres, new_level); | |
3792 | } | |
3793 | ||
3794 | static int ocfs2_refcount_convert_worker(struct ocfs2_lock_res *lockres, | |
3795 | int blocking) | |
3796 | { | |
3797 | struct ocfs2_refcount_tree *tree = | |
3798 | ocfs2_lock_res_refcount_tree(lockres); | |
3799 | ||
3800 | ocfs2_metadata_cache_purge(&tree->rf_ci); | |
3801 | ||
3802 | return UNBLOCK_CONTINUE; | |
3803 | } | |
3804 | ||
9e33d69f JK |
3805 | static void ocfs2_set_qinfo_lvb(struct ocfs2_lock_res *lockres) |
3806 | { | |
3807 | struct ocfs2_qinfo_lvb *lvb; | |
3808 | struct ocfs2_mem_dqinfo *oinfo = ocfs2_lock_res_qinfo(lockres); | |
3809 | struct mem_dqinfo *info = sb_dqinfo(oinfo->dqi_gi.dqi_sb, | |
3810 | oinfo->dqi_gi.dqi_type); | |
3811 | ||
a641dc2a | 3812 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
9e33d69f JK |
3813 | lvb->lvb_version = OCFS2_QINFO_LVB_VERSION; |
3814 | lvb->lvb_bgrace = cpu_to_be32(info->dqi_bgrace); | |
3815 | lvb->lvb_igrace = cpu_to_be32(info->dqi_igrace); | |
3816 | lvb->lvb_syncms = cpu_to_be32(oinfo->dqi_syncms); | |
3817 | lvb->lvb_blocks = cpu_to_be32(oinfo->dqi_gi.dqi_blocks); | |
3818 | lvb->lvb_free_blk = cpu_to_be32(oinfo->dqi_gi.dqi_free_blk); | |
3819 | lvb->lvb_free_entry = cpu_to_be32(oinfo->dqi_gi.dqi_free_entry); | |
9e33d69f JK |
3820 | } |
3821 | ||
3822 | void ocfs2_qinfo_unlock(struct ocfs2_mem_dqinfo *oinfo, int ex) | |
3823 | { | |
3824 | struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock; | |
3825 | struct ocfs2_super *osb = OCFS2_SB(oinfo->dqi_gi.dqi_sb); | |
3826 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; | |
3827 | ||
9e33d69f JK |
3828 | if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb)) |
3829 | ocfs2_cluster_unlock(osb, lockres, level); | |
9e33d69f JK |
3830 | } |
3831 | ||
3832 | static int ocfs2_refresh_qinfo(struct ocfs2_mem_dqinfo *oinfo) | |
3833 | { | |
3834 | struct mem_dqinfo *info = sb_dqinfo(oinfo->dqi_gi.dqi_sb, | |
3835 | oinfo->dqi_gi.dqi_type); | |
3836 | struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock; | |
3837 | struct ocfs2_qinfo_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
85eb8b73 | 3838 | struct buffer_head *bh = NULL; |
9e33d69f JK |
3839 | struct ocfs2_global_disk_dqinfo *gdinfo; |
3840 | int status = 0; | |
3841 | ||
1c520dfb JB |
3842 | if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) && |
3843 | lvb->lvb_version == OCFS2_QINFO_LVB_VERSION) { | |
9e33d69f JK |
3844 | info->dqi_bgrace = be32_to_cpu(lvb->lvb_bgrace); |
3845 | info->dqi_igrace = be32_to_cpu(lvb->lvb_igrace); | |
3846 | oinfo->dqi_syncms = be32_to_cpu(lvb->lvb_syncms); | |
3847 | oinfo->dqi_gi.dqi_blocks = be32_to_cpu(lvb->lvb_blocks); | |
3848 | oinfo->dqi_gi.dqi_free_blk = be32_to_cpu(lvb->lvb_free_blk); | |
3849 | oinfo->dqi_gi.dqi_free_entry = | |
3850 | be32_to_cpu(lvb->lvb_free_entry); | |
3851 | } else { | |
ae4f6ef1 JK |
3852 | status = ocfs2_read_quota_phys_block(oinfo->dqi_gqinode, |
3853 | oinfo->dqi_giblk, &bh); | |
85eb8b73 | 3854 | if (status) { |
9e33d69f JK |
3855 | mlog_errno(status); |
3856 | goto bail; | |
3857 | } | |
3858 | gdinfo = (struct ocfs2_global_disk_dqinfo *) | |
3859 | (bh->b_data + OCFS2_GLOBAL_INFO_OFF); | |
3860 | info->dqi_bgrace = le32_to_cpu(gdinfo->dqi_bgrace); | |
3861 | info->dqi_igrace = le32_to_cpu(gdinfo->dqi_igrace); | |
3862 | oinfo->dqi_syncms = le32_to_cpu(gdinfo->dqi_syncms); | |
3863 | oinfo->dqi_gi.dqi_blocks = le32_to_cpu(gdinfo->dqi_blocks); | |
3864 | oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(gdinfo->dqi_free_blk); | |
3865 | oinfo->dqi_gi.dqi_free_entry = | |
3866 | le32_to_cpu(gdinfo->dqi_free_entry); | |
3867 | brelse(bh); | |
3868 | ocfs2_track_lock_refresh(lockres); | |
3869 | } | |
3870 | ||
3871 | bail: | |
3872 | return status; | |
3873 | } | |
3874 | ||
3875 | /* Lock quota info, this function expects at least shared lock on the quota file | |
3876 | * so that we can safely refresh quota info from disk. */ | |
3877 | int ocfs2_qinfo_lock(struct ocfs2_mem_dqinfo *oinfo, int ex) | |
3878 | { | |
3879 | struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock; | |
3880 | struct ocfs2_super *osb = OCFS2_SB(oinfo->dqi_gi.dqi_sb); | |
3881 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; | |
3882 | int status = 0; | |
3883 | ||
9e33d69f JK |
3884 | /* On RO devices, locking really isn't needed... */ |
3885 | if (ocfs2_is_hard_readonly(osb)) { | |
3886 | if (ex) | |
3887 | status = -EROFS; | |
3888 | goto bail; | |
3889 | } | |
3890 | if (ocfs2_mount_local(osb)) | |
3891 | goto bail; | |
3892 | ||
3893 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); | |
3894 | if (status < 0) { | |
3895 | mlog_errno(status); | |
3896 | goto bail; | |
3897 | } | |
3898 | if (!ocfs2_should_refresh_lock_res(lockres)) | |
3899 | goto bail; | |
3900 | /* OK, we have the lock but we need to refresh the quota info */ | |
3901 | status = ocfs2_refresh_qinfo(oinfo); | |
3902 | if (status) | |
3903 | ocfs2_qinfo_unlock(oinfo, ex); | |
3904 | ocfs2_complete_lock_res_refresh(lockres, status); | |
3905 | bail: | |
9e33d69f JK |
3906 | return status; |
3907 | } | |
3908 | ||
8dec98ed TM |
3909 | int ocfs2_refcount_lock(struct ocfs2_refcount_tree *ref_tree, int ex) |
3910 | { | |
3911 | int status; | |
3912 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; | |
3913 | struct ocfs2_lock_res *lockres = &ref_tree->rf_lockres; | |
3914 | struct ocfs2_super *osb = lockres->l_priv; | |
3915 | ||
3916 | ||
3917 | if (ocfs2_is_hard_readonly(osb)) | |
3918 | return -EROFS; | |
3919 | ||
3920 | if (ocfs2_mount_local(osb)) | |
3921 | return 0; | |
3922 | ||
3923 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); | |
3924 | if (status < 0) | |
3925 | mlog_errno(status); | |
3926 | ||
3927 | return status; | |
3928 | } | |
3929 | ||
3930 | void ocfs2_refcount_unlock(struct ocfs2_refcount_tree *ref_tree, int ex) | |
3931 | { | |
3932 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; | |
3933 | struct ocfs2_lock_res *lockres = &ref_tree->rf_lockres; | |
3934 | struct ocfs2_super *osb = lockres->l_priv; | |
3935 | ||
3936 | if (!ocfs2_mount_local(osb)) | |
3937 | ocfs2_cluster_unlock(osb, lockres, level); | |
3938 | } | |
3939 | ||
00600056 AB |
3940 | static void ocfs2_process_blocked_lock(struct ocfs2_super *osb, |
3941 | struct ocfs2_lock_res *lockres) | |
ccd979bd MF |
3942 | { |
3943 | int status; | |
d680efe9 | 3944 | struct ocfs2_unblock_ctl ctl = {0, 0,}; |
ccd979bd MF |
3945 | unsigned long flags; |
3946 | ||
3947 | /* Our reference to the lockres in this function can be | |
3948 | * considered valid until we remove the OCFS2_LOCK_QUEUED | |
3949 | * flag. */ | |
3950 | ||
ccd979bd MF |
3951 | BUG_ON(!lockres); |
3952 | BUG_ON(!lockres->l_ops); | |
ccd979bd | 3953 | |
9b915181 | 3954 | mlog(ML_BASTS, "lockres %s blocked\n", lockres->l_name); |
ccd979bd MF |
3955 | |
3956 | /* Detect whether a lock has been marked as going away while | |
34d024f8 | 3957 | * the downconvert thread was processing other things. A lock can |
ccd979bd MF |
3958 | * still be marked with OCFS2_LOCK_FREEING after this check, |
3959 | * but short circuiting here will still save us some | |
3960 | * performance. */ | |
3961 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3962 | if (lockres->l_flags & OCFS2_LOCK_FREEING) | |
3963 | goto unqueue; | |
3964 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3965 | ||
b5e500e2 | 3966 | status = ocfs2_unblock_lock(osb, lockres, &ctl); |
ccd979bd MF |
3967 | if (status < 0) |
3968 | mlog_errno(status); | |
3969 | ||
3970 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3971 | unqueue: | |
d680efe9 | 3972 | if (lockres->l_flags & OCFS2_LOCK_FREEING || !ctl.requeue) { |
ccd979bd MF |
3973 | lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED); |
3974 | } else | |
3975 | ocfs2_schedule_blocked_lock(osb, lockres); | |
3976 | ||
9b915181 | 3977 | mlog(ML_BASTS, "lockres %s, requeue = %s.\n", lockres->l_name, |
d680efe9 | 3978 | ctl.requeue ? "yes" : "no"); |
ccd979bd MF |
3979 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
3980 | ||
d680efe9 MF |
3981 | if (ctl.unblock_action != UNBLOCK_CONTINUE |
3982 | && lockres->l_ops->post_unlock) | |
3983 | lockres->l_ops->post_unlock(osb, lockres); | |
ccd979bd MF |
3984 | } |
3985 | ||
3986 | static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, | |
3987 | struct ocfs2_lock_res *lockres) | |
3988 | { | |
a75e9cca SE |
3989 | unsigned long flags; |
3990 | ||
ccd979bd MF |
3991 | assert_spin_locked(&lockres->l_lock); |
3992 | ||
3993 | if (lockres->l_flags & OCFS2_LOCK_FREEING) { | |
3994 | /* Do not schedule a lock for downconvert when it's on | |
3995 | * the way to destruction - any nodes wanting access | |
3996 | * to the resource will get it soon. */ | |
9b915181 | 3997 | mlog(ML_BASTS, "lockres %s won't be scheduled: flags 0x%lx\n", |
ccd979bd MF |
3998 | lockres->l_name, lockres->l_flags); |
3999 | return; | |
4000 | } | |
4001 | ||
4002 | lockres_or_flags(lockres, OCFS2_LOCK_QUEUED); | |
4003 | ||
a75e9cca | 4004 | spin_lock_irqsave(&osb->dc_task_lock, flags); |
ccd979bd MF |
4005 | if (list_empty(&lockres->l_blocked_list)) { |
4006 | list_add_tail(&lockres->l_blocked_list, | |
4007 | &osb->blocked_lock_list); | |
4008 | osb->blocked_lock_count++; | |
4009 | } | |
a75e9cca | 4010 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
ccd979bd | 4011 | } |
34d024f8 MF |
4012 | |
4013 | static void ocfs2_downconvert_thread_do_work(struct ocfs2_super *osb) | |
4014 | { | |
4015 | unsigned long processed; | |
a75e9cca | 4016 | unsigned long flags; |
34d024f8 MF |
4017 | struct ocfs2_lock_res *lockres; |
4018 | ||
a75e9cca | 4019 | spin_lock_irqsave(&osb->dc_task_lock, flags); |
34d024f8 MF |
4020 | /* grab this early so we know to try again if a state change and |
4021 | * wake happens part-way through our work */ | |
4022 | osb->dc_work_sequence = osb->dc_wake_sequence; | |
4023 | ||
4024 | processed = osb->blocked_lock_count; | |
209f7512 JQ |
4025 | /* |
4026 | * blocked lock processing in this loop might call iput which can | |
4027 | * remove items off osb->blocked_lock_list. Downconvert up to | |
4028 | * 'processed' number of locks, but stop short if we had some | |
4029 | * removed in ocfs2_mark_lockres_freeing when downconverting. | |
4030 | */ | |
4031 | while (processed && !list_empty(&osb->blocked_lock_list)) { | |
34d024f8 MF |
4032 | lockres = list_entry(osb->blocked_lock_list.next, |
4033 | struct ocfs2_lock_res, l_blocked_list); | |
4034 | list_del_init(&lockres->l_blocked_list); | |
4035 | osb->blocked_lock_count--; | |
a75e9cca | 4036 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
34d024f8 MF |
4037 | |
4038 | BUG_ON(!processed); | |
4039 | processed--; | |
4040 | ||
4041 | ocfs2_process_blocked_lock(osb, lockres); | |
4042 | ||
a75e9cca | 4043 | spin_lock_irqsave(&osb->dc_task_lock, flags); |
34d024f8 | 4044 | } |
a75e9cca | 4045 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
34d024f8 MF |
4046 | } |
4047 | ||
4048 | static int ocfs2_downconvert_thread_lists_empty(struct ocfs2_super *osb) | |
4049 | { | |
4050 | int empty = 0; | |
a75e9cca | 4051 | unsigned long flags; |
34d024f8 | 4052 | |
a75e9cca | 4053 | spin_lock_irqsave(&osb->dc_task_lock, flags); |
34d024f8 MF |
4054 | if (list_empty(&osb->blocked_lock_list)) |
4055 | empty = 1; | |
4056 | ||
a75e9cca | 4057 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
34d024f8 MF |
4058 | return empty; |
4059 | } | |
4060 | ||
4061 | static int ocfs2_downconvert_thread_should_wake(struct ocfs2_super *osb) | |
4062 | { | |
4063 | int should_wake = 0; | |
a75e9cca | 4064 | unsigned long flags; |
34d024f8 | 4065 | |
a75e9cca | 4066 | spin_lock_irqsave(&osb->dc_task_lock, flags); |
34d024f8 MF |
4067 | if (osb->dc_work_sequence != osb->dc_wake_sequence) |
4068 | should_wake = 1; | |
a75e9cca | 4069 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
34d024f8 MF |
4070 | |
4071 | return should_wake; | |
4072 | } | |
4073 | ||
200bfae3 | 4074 | static int ocfs2_downconvert_thread(void *arg) |
34d024f8 MF |
4075 | { |
4076 | int status = 0; | |
4077 | struct ocfs2_super *osb = arg; | |
4078 | ||
4079 | /* only quit once we've been asked to stop and there is no more | |
4080 | * work available */ | |
4081 | while (!(kthread_should_stop() && | |
4082 | ocfs2_downconvert_thread_lists_empty(osb))) { | |
4083 | ||
4084 | wait_event_interruptible(osb->dc_event, | |
4085 | ocfs2_downconvert_thread_should_wake(osb) || | |
4086 | kthread_should_stop()); | |
4087 | ||
4088 | mlog(0, "downconvert_thread: awoken\n"); | |
4089 | ||
4090 | ocfs2_downconvert_thread_do_work(osb); | |
4091 | } | |
4092 | ||
4093 | osb->dc_task = NULL; | |
4094 | return status; | |
4095 | } | |
4096 | ||
4097 | void ocfs2_wake_downconvert_thread(struct ocfs2_super *osb) | |
4098 | { | |
a75e9cca SE |
4099 | unsigned long flags; |
4100 | ||
4101 | spin_lock_irqsave(&osb->dc_task_lock, flags); | |
34d024f8 MF |
4102 | /* make sure the voting thread gets a swipe at whatever changes |
4103 | * the caller may have made to the voting state */ | |
4104 | osb->dc_wake_sequence++; | |
a75e9cca | 4105 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
34d024f8 MF |
4106 | wake_up(&osb->dc_event); |
4107 | } |