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328970de | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
fa60ce2c | 2 | /* |
ccd979bd MF |
3 | * dlmglue.c |
4 | * | |
5 | * Code which implements an OCFS2 specific interface to our DLM. | |
6 | * | |
7 | * Copyright (C) 2003, 2004 Oracle. All rights reserved. | |
ccd979bd MF |
8 | */ |
9 | ||
10 | #include <linux/types.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/highmem.h> | |
13 | #include <linux/mm.h> | |
ccd979bd MF |
14 | #include <linux/kthread.h> |
15 | #include <linux/pagemap.h> | |
16 | #include <linux/debugfs.h> | |
17 | #include <linux/seq_file.h> | |
8ddb7b00 | 18 | #include <linux/time.h> |
9673e005 | 19 | #include <linux/delay.h> |
9e33d69f | 20 | #include <linux/quotaops.h> |
174cd4b1 | 21 | #include <linux/sched/signal.h> |
ccd979bd | 22 | |
ccd979bd MF |
23 | #define MLOG_MASK_PREFIX ML_DLM_GLUE |
24 | #include <cluster/masklog.h> | |
25 | ||
26 | #include "ocfs2.h" | |
d24fbcda | 27 | #include "ocfs2_lockingver.h" |
ccd979bd MF |
28 | |
29 | #include "alloc.h" | |
d680efe9 | 30 | #include "dcache.h" |
ccd979bd MF |
31 | #include "dlmglue.h" |
32 | #include "extent_map.h" | |
7f1a37e3 | 33 | #include "file.h" |
ccd979bd MF |
34 | #include "heartbeat.h" |
35 | #include "inode.h" | |
36 | #include "journal.h" | |
24ef1815 | 37 | #include "stackglue.h" |
ccd979bd MF |
38 | #include "slot_map.h" |
39 | #include "super.h" | |
40 | #include "uptodate.h" | |
9e33d69f | 41 | #include "quota.h" |
8dec98ed | 42 | #include "refcounttree.h" |
b8a7a3a6 | 43 | #include "acl.h" |
ccd979bd MF |
44 | |
45 | #include "buffer_head_io.h" | |
46 | ||
47 | struct ocfs2_mask_waiter { | |
48 | struct list_head mw_item; | |
49 | int mw_status; | |
50 | struct completion mw_complete; | |
51 | unsigned long mw_mask; | |
52 | unsigned long mw_goal; | |
8ddb7b00 | 53 | #ifdef CONFIG_OCFS2_FS_STATS |
5bc970e8 | 54 | ktime_t mw_lock_start; |
8ddb7b00 | 55 | #endif |
ccd979bd MF |
56 | }; |
57 | ||
54a7e755 MF |
58 | static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres); |
59 | static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres); | |
cf8e06f1 | 60 | static struct ocfs2_super *ocfs2_get_file_osb(struct ocfs2_lock_res *lockres); |
9e33d69f | 61 | static struct ocfs2_super *ocfs2_get_qinfo_osb(struct ocfs2_lock_res *lockres); |
ccd979bd | 62 | |
d680efe9 | 63 | /* |
cc567d89 | 64 | * Return value from ->downconvert_worker functions. |
d680efe9 | 65 | * |
b5e500e2 | 66 | * These control the precise actions of ocfs2_unblock_lock() |
d680efe9 MF |
67 | * and ocfs2_process_blocked_lock() |
68 | * | |
69 | */ | |
70 | enum ocfs2_unblock_action { | |
71 | UNBLOCK_CONTINUE = 0, /* Continue downconvert */ | |
72 | UNBLOCK_CONTINUE_POST = 1, /* Continue downconvert, fire | |
73 | * ->post_unlock callback */ | |
74 | UNBLOCK_STOP_POST = 2, /* Do not downconvert, fire | |
75 | * ->post_unlock() callback. */ | |
76 | }; | |
77 | ||
78 | struct ocfs2_unblock_ctl { | |
79 | int requeue; | |
80 | enum ocfs2_unblock_action unblock_action; | |
81 | }; | |
82 | ||
cb25797d | 83 | /* Lockdep class keys */ |
1cff514a | 84 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
480bd564 | 85 | static struct lock_class_key lockdep_keys[OCFS2_NUM_LOCK_TYPES]; |
1cff514a | 86 | #endif |
cb25797d | 87 | |
810d5aeb MF |
88 | static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres, |
89 | int new_level); | |
90 | static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres); | |
91 | ||
cc567d89 MF |
92 | static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, |
93 | int blocking); | |
94 | ||
cc567d89 MF |
95 | static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, |
96 | int blocking); | |
d680efe9 MF |
97 | |
98 | static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, | |
99 | struct ocfs2_lock_res *lockres); | |
ccd979bd | 100 | |
9e33d69f | 101 | static void ocfs2_set_qinfo_lvb(struct ocfs2_lock_res *lockres); |
6cb129f5 | 102 | |
8dec98ed TM |
103 | static int ocfs2_check_refcount_downconvert(struct ocfs2_lock_res *lockres, |
104 | int new_level); | |
105 | static int ocfs2_refcount_convert_worker(struct ocfs2_lock_res *lockres, | |
106 | int blocking); | |
107 | ||
6cb129f5 AB |
108 | #define mlog_meta_lvb(__level, __lockres) ocfs2_dump_meta_lvb_info(__level, __PRETTY_FUNCTION__, __LINE__, __lockres) |
109 | ||
110 | /* This aids in debugging situations where a bad LVB might be involved. */ | |
111 | static void ocfs2_dump_meta_lvb_info(u64 level, | |
112 | const char *function, | |
113 | unsigned int line, | |
114 | struct ocfs2_lock_res *lockres) | |
115 | { | |
a641dc2a | 116 | struct ocfs2_meta_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
6cb129f5 AB |
117 | |
118 | mlog(level, "LVB information for %s (called from %s:%u):\n", | |
119 | lockres->l_name, function, line); | |
120 | mlog(level, "version: %u, clusters: %u, generation: 0x%x\n", | |
121 | lvb->lvb_version, be32_to_cpu(lvb->lvb_iclusters), | |
122 | be32_to_cpu(lvb->lvb_igeneration)); | |
123 | mlog(level, "size: %llu, uid %u, gid %u, mode 0x%x\n", | |
124 | (unsigned long long)be64_to_cpu(lvb->lvb_isize), | |
125 | be32_to_cpu(lvb->lvb_iuid), be32_to_cpu(lvb->lvb_igid), | |
126 | be16_to_cpu(lvb->lvb_imode)); | |
127 | mlog(level, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, " | |
128 | "mtime_packed 0x%llx iattr 0x%x\n", be16_to_cpu(lvb->lvb_inlink), | |
129 | (long long)be64_to_cpu(lvb->lvb_iatime_packed), | |
130 | (long long)be64_to_cpu(lvb->lvb_ictime_packed), | |
131 | (long long)be64_to_cpu(lvb->lvb_imtime_packed), | |
132 | be32_to_cpu(lvb->lvb_iattr)); | |
133 | } | |
134 | ||
135 | ||
f625c979 MF |
136 | /* |
137 | * OCFS2 Lock Resource Operations | |
138 | * | |
139 | * These fine tune the behavior of the generic dlmglue locking infrastructure. | |
0d5dc6c2 MF |
140 | * |
141 | * The most basic of lock types can point ->l_priv to their respective | |
142 | * struct ocfs2_super and allow the default actions to manage things. | |
143 | * | |
144 | * Right now, each lock type also needs to implement an init function, | |
145 | * and trivial lock/unlock wrappers. ocfs2_simple_drop_lockres() | |
146 | * should be called when the lock is no longer needed (i.e., object | |
147 | * destruction time). | |
f625c979 | 148 | */ |
ccd979bd | 149 | struct ocfs2_lock_res_ops { |
54a7e755 MF |
150 | /* |
151 | * Translate an ocfs2_lock_res * into an ocfs2_super *. Define | |
152 | * this callback if ->l_priv is not an ocfs2_super pointer | |
153 | */ | |
154 | struct ocfs2_super * (*get_osb)(struct ocfs2_lock_res *); | |
b5e500e2 | 155 | |
0d5dc6c2 | 156 | /* |
34d024f8 MF |
157 | * Optionally called in the downconvert thread after a |
158 | * successful downconvert. The lockres will not be referenced | |
159 | * after this callback is called, so it is safe to free | |
160 | * memory, etc. | |
0d5dc6c2 MF |
161 | * |
162 | * The exact semantics of when this is called are controlled | |
163 | * by ->downconvert_worker() | |
164 | */ | |
d680efe9 | 165 | void (*post_unlock)(struct ocfs2_super *, struct ocfs2_lock_res *); |
f625c979 | 166 | |
16d5b956 MF |
167 | /* |
168 | * Allow a lock type to add checks to determine whether it is | |
169 | * safe to downconvert a lock. Return 0 to re-queue the | |
170 | * downconvert at a later time, nonzero to continue. | |
171 | * | |
172 | * For most locks, the default checks that there are no | |
173 | * incompatible holders are sufficient. | |
174 | * | |
175 | * Called with the lockres spinlock held. | |
176 | */ | |
177 | int (*check_downconvert)(struct ocfs2_lock_res *, int); | |
178 | ||
5ef0d4ea MF |
179 | /* |
180 | * Allows a lock type to populate the lock value block. This | |
181 | * is called on downconvert, and when we drop a lock. | |
182 | * | |
183 | * Locks that want to use this should set LOCK_TYPE_USES_LVB | |
184 | * in the flags field. | |
185 | * | |
186 | * Called with the lockres spinlock held. | |
187 | */ | |
188 | void (*set_lvb)(struct ocfs2_lock_res *); | |
189 | ||
cc567d89 MF |
190 | /* |
191 | * Called from the downconvert thread when it is determined | |
192 | * that a lock will be downconverted. This is called without | |
193 | * any locks held so the function can do work that might | |
194 | * schedule (syncing out data, etc). | |
195 | * | |
196 | * This should return any one of the ocfs2_unblock_action | |
197 | * values, depending on what it wants the thread to do. | |
198 | */ | |
199 | int (*downconvert_worker)(struct ocfs2_lock_res *, int); | |
200 | ||
f625c979 MF |
201 | /* |
202 | * LOCK_TYPE_* flags which describe the specific requirements | |
203 | * of a lock type. Descriptions of each individual flag follow. | |
204 | */ | |
205 | int flags; | |
ccd979bd MF |
206 | }; |
207 | ||
f625c979 MF |
208 | /* |
209 | * Some locks want to "refresh" potentially stale data when a | |
210 | * meaningful (PRMODE or EXMODE) lock level is first obtained. If this | |
211 | * flag is set, the OCFS2_LOCK_NEEDS_REFRESH flag will be set on the | |
212 | * individual lockres l_flags member from the ast function. It is | |
213 | * expected that the locking wrapper will clear the | |
214 | * OCFS2_LOCK_NEEDS_REFRESH flag when done. | |
215 | */ | |
216 | #define LOCK_TYPE_REQUIRES_REFRESH 0x1 | |
217 | ||
b80fc012 | 218 | /* |
5ef0d4ea MF |
219 | * Indicate that a lock type makes use of the lock value block. The |
220 | * ->set_lvb lock type callback must be defined. | |
b80fc012 MF |
221 | */ |
222 | #define LOCK_TYPE_USES_LVB 0x2 | |
223 | ||
ccd979bd | 224 | static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = { |
54a7e755 | 225 | .get_osb = ocfs2_get_inode_osb, |
f625c979 | 226 | .flags = 0, |
ccd979bd MF |
227 | }; |
228 | ||
e63aecb6 | 229 | static struct ocfs2_lock_res_ops ocfs2_inode_inode_lops = { |
54a7e755 | 230 | .get_osb = ocfs2_get_inode_osb, |
810d5aeb MF |
231 | .check_downconvert = ocfs2_check_meta_downconvert, |
232 | .set_lvb = ocfs2_set_meta_lvb, | |
f1f54068 | 233 | .downconvert_worker = ocfs2_data_convert_worker, |
b80fc012 | 234 | .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB, |
ccd979bd MF |
235 | }; |
236 | ||
ccd979bd | 237 | static struct ocfs2_lock_res_ops ocfs2_super_lops = { |
f625c979 | 238 | .flags = LOCK_TYPE_REQUIRES_REFRESH, |
ccd979bd MF |
239 | }; |
240 | ||
241 | static struct ocfs2_lock_res_ops ocfs2_rename_lops = { | |
f625c979 | 242 | .flags = 0, |
ccd979bd MF |
243 | }; |
244 | ||
6ca497a8 | 245 | static struct ocfs2_lock_res_ops ocfs2_nfs_sync_lops = { |
246 | .flags = 0, | |
247 | }; | |
248 | ||
4882abeb GH |
249 | static struct ocfs2_lock_res_ops ocfs2_trim_fs_lops = { |
250 | .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB, | |
251 | }; | |
252 | ||
83273932 SE |
253 | static struct ocfs2_lock_res_ops ocfs2_orphan_scan_lops = { |
254 | .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB, | |
255 | }; | |
256 | ||
d680efe9 | 257 | static struct ocfs2_lock_res_ops ocfs2_dentry_lops = { |
54a7e755 | 258 | .get_osb = ocfs2_get_dentry_osb, |
d680efe9 | 259 | .post_unlock = ocfs2_dentry_post_unlock, |
cc567d89 | 260 | .downconvert_worker = ocfs2_dentry_convert_worker, |
f625c979 | 261 | .flags = 0, |
d680efe9 MF |
262 | }; |
263 | ||
50008630 TY |
264 | static struct ocfs2_lock_res_ops ocfs2_inode_open_lops = { |
265 | .get_osb = ocfs2_get_inode_osb, | |
266 | .flags = 0, | |
267 | }; | |
268 | ||
cf8e06f1 MF |
269 | static struct ocfs2_lock_res_ops ocfs2_flock_lops = { |
270 | .get_osb = ocfs2_get_file_osb, | |
271 | .flags = 0, | |
272 | }; | |
273 | ||
9e33d69f JK |
274 | static struct ocfs2_lock_res_ops ocfs2_qinfo_lops = { |
275 | .set_lvb = ocfs2_set_qinfo_lvb, | |
276 | .get_osb = ocfs2_get_qinfo_osb, | |
277 | .flags = LOCK_TYPE_REQUIRES_REFRESH | LOCK_TYPE_USES_LVB, | |
278 | }; | |
279 | ||
8dec98ed TM |
280 | static struct ocfs2_lock_res_ops ocfs2_refcount_block_lops = { |
281 | .check_downconvert = ocfs2_check_refcount_downconvert, | |
282 | .downconvert_worker = ocfs2_refcount_convert_worker, | |
283 | .flags = 0, | |
284 | }; | |
285 | ||
ccd979bd MF |
286 | static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres) |
287 | { | |
288 | return lockres->l_type == OCFS2_LOCK_TYPE_META || | |
50008630 TY |
289 | lockres->l_type == OCFS2_LOCK_TYPE_RW || |
290 | lockres->l_type == OCFS2_LOCK_TYPE_OPEN; | |
ccd979bd MF |
291 | } |
292 | ||
c0e41338 | 293 | static inline struct ocfs2_lock_res *ocfs2_lksb_to_lock_res(struct ocfs2_dlm_lksb *lksb) |
a796d286 JB |
294 | { |
295 | return container_of(lksb, struct ocfs2_lock_res, l_lksb); | |
296 | } | |
297 | ||
ccd979bd MF |
298 | static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres) |
299 | { | |
300 | BUG_ON(!ocfs2_is_inode_lock(lockres)); | |
301 | ||
302 | return (struct inode *) lockres->l_priv; | |
303 | } | |
304 | ||
d680efe9 MF |
305 | static inline struct ocfs2_dentry_lock *ocfs2_lock_res_dl(struct ocfs2_lock_res *lockres) |
306 | { | |
307 | BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_DENTRY); | |
308 | ||
309 | return (struct ocfs2_dentry_lock *)lockres->l_priv; | |
310 | } | |
311 | ||
9e33d69f JK |
312 | static inline struct ocfs2_mem_dqinfo *ocfs2_lock_res_qinfo(struct ocfs2_lock_res *lockres) |
313 | { | |
314 | BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_QINFO); | |
315 | ||
316 | return (struct ocfs2_mem_dqinfo *)lockres->l_priv; | |
317 | } | |
318 | ||
8dec98ed TM |
319 | static inline struct ocfs2_refcount_tree * |
320 | ocfs2_lock_res_refcount_tree(struct ocfs2_lock_res *res) | |
321 | { | |
322 | return container_of(res, struct ocfs2_refcount_tree, rf_lockres); | |
323 | } | |
324 | ||
54a7e755 MF |
325 | static inline struct ocfs2_super *ocfs2_get_lockres_osb(struct ocfs2_lock_res *lockres) |
326 | { | |
327 | if (lockres->l_ops->get_osb) | |
328 | return lockres->l_ops->get_osb(lockres); | |
329 | ||
330 | return (struct ocfs2_super *)lockres->l_priv; | |
331 | } | |
332 | ||
ccd979bd MF |
333 | static int ocfs2_lock_create(struct ocfs2_super *osb, |
334 | struct ocfs2_lock_res *lockres, | |
335 | int level, | |
bd3e7610 | 336 | u32 dlm_flags); |
ccd979bd MF |
337 | static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, |
338 | int wanted); | |
cb25797d JK |
339 | static void __ocfs2_cluster_unlock(struct ocfs2_super *osb, |
340 | struct ocfs2_lock_res *lockres, | |
341 | int level, unsigned long caller_ip); | |
342 | static inline void ocfs2_cluster_unlock(struct ocfs2_super *osb, | |
343 | struct ocfs2_lock_res *lockres, | |
344 | int level) | |
345 | { | |
346 | __ocfs2_cluster_unlock(osb, lockres, level, _RET_IP_); | |
347 | } | |
348 | ||
ccd979bd MF |
349 | static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres); |
350 | static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres); | |
351 | static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres); | |
352 | static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, int level); | |
353 | static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, | |
354 | struct ocfs2_lock_res *lockres); | |
355 | static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, | |
356 | int convert); | |
c74ff8bb SM |
357 | #define ocfs2_log_dlm_error(_func, _err, _lockres) do { \ |
358 | if ((_lockres)->l_type != OCFS2_LOCK_TYPE_DENTRY) \ | |
359 | mlog(ML_ERROR, "DLM error %d while calling %s on resource %s\n", \ | |
360 | _err, _func, _lockres->l_name); \ | |
361 | else \ | |
362 | mlog(ML_ERROR, "DLM error %d while calling %s on resource %.*s%08x\n", \ | |
363 | _err, _func, OCFS2_DENTRY_LOCK_INO_START - 1, (_lockres)->l_name, \ | |
364 | (unsigned int)ocfs2_get_dentry_lock_ino(_lockres)); \ | |
ccd979bd | 365 | } while (0) |
34d024f8 MF |
366 | static int ocfs2_downconvert_thread(void *arg); |
367 | static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb, | |
368 | struct ocfs2_lock_res *lockres); | |
e63aecb6 | 369 | static int ocfs2_inode_lock_update(struct inode *inode, |
ccd979bd MF |
370 | struct buffer_head **bh); |
371 | static void ocfs2_drop_osb_locks(struct ocfs2_super *osb); | |
372 | static inline int ocfs2_highest_compat_lock_level(int level); | |
de551246 JB |
373 | static unsigned int ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres, |
374 | int new_level); | |
cf8e06f1 MF |
375 | static int ocfs2_downconvert_lock(struct ocfs2_super *osb, |
376 | struct ocfs2_lock_res *lockres, | |
377 | int new_level, | |
de551246 JB |
378 | int lvb, |
379 | unsigned int generation); | |
cf8e06f1 MF |
380 | static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb, |
381 | struct ocfs2_lock_res *lockres); | |
382 | static int ocfs2_cancel_convert(struct ocfs2_super *osb, | |
383 | struct ocfs2_lock_res *lockres); | |
384 | ||
ccd979bd | 385 | |
ccd979bd MF |
386 | static void ocfs2_build_lock_name(enum ocfs2_lock_type type, |
387 | u64 blkno, | |
388 | u32 generation, | |
389 | char *name) | |
390 | { | |
391 | int len; | |
392 | ||
ccd979bd MF |
393 | BUG_ON(type >= OCFS2_NUM_LOCK_TYPES); |
394 | ||
b0697053 MF |
395 | len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016llx%08x", |
396 | ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD, | |
397 | (long long)blkno, generation); | |
ccd979bd MF |
398 | |
399 | BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1)); | |
400 | ||
401 | mlog(0, "built lock resource with name: %s\n", name); | |
ccd979bd MF |
402 | } |
403 | ||
34af946a | 404 | static DEFINE_SPINLOCK(ocfs2_dlm_tracking_lock); |
ccd979bd MF |
405 | |
406 | static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res, | |
407 | struct ocfs2_dlm_debug *dlm_debug) | |
408 | { | |
409 | mlog(0, "Add tracking for lockres %s\n", res->l_name); | |
410 | ||
411 | spin_lock(&ocfs2_dlm_tracking_lock); | |
412 | list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking); | |
413 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
414 | } | |
415 | ||
416 | static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res) | |
417 | { | |
418 | spin_lock(&ocfs2_dlm_tracking_lock); | |
419 | if (!list_empty(&res->l_debug_list)) | |
420 | list_del_init(&res->l_debug_list); | |
421 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
422 | } | |
423 | ||
8ddb7b00 SM |
424 | #ifdef CONFIG_OCFS2_FS_STATS |
425 | static void ocfs2_init_lock_stats(struct ocfs2_lock_res *res) | |
426 | { | |
8ddb7b00 | 427 | res->l_lock_refresh = 0; |
5da844a2 | 428 | res->l_lock_wait = 0; |
5bc970e8 SM |
429 | memset(&res->l_lock_prmode, 0, sizeof(struct ocfs2_lock_stats)); |
430 | memset(&res->l_lock_exmode, 0, sizeof(struct ocfs2_lock_stats)); | |
8ddb7b00 SM |
431 | } |
432 | ||
433 | static void ocfs2_update_lock_stats(struct ocfs2_lock_res *res, int level, | |
434 | struct ocfs2_mask_waiter *mw, int ret) | |
435 | { | |
5bc970e8 SM |
436 | u32 usec; |
437 | ktime_t kt; | |
438 | struct ocfs2_lock_stats *stats; | |
439 | ||
440 | if (level == LKM_PRMODE) | |
441 | stats = &res->l_lock_prmode; | |
442 | else if (level == LKM_EXMODE) | |
443 | stats = &res->l_lock_exmode; | |
444 | else | |
8ddb7b00 SM |
445 | return; |
446 | ||
5bc970e8 SM |
447 | kt = ktime_sub(ktime_get(), mw->mw_lock_start); |
448 | usec = ktime_to_us(kt); | |
449 | ||
450 | stats->ls_gets++; | |
451 | stats->ls_total += ktime_to_ns(kt); | |
452 | /* overflow */ | |
16865b7c | 453 | if (unlikely(stats->ls_gets == 0)) { |
5bc970e8 SM |
454 | stats->ls_gets++; |
455 | stats->ls_total = ktime_to_ns(kt); | |
456 | } | |
457 | ||
458 | if (stats->ls_max < usec) | |
459 | stats->ls_max = usec; | |
460 | ||
8ddb7b00 | 461 | if (ret) |
5bc970e8 | 462 | stats->ls_fail++; |
8a7f5f4c GH |
463 | |
464 | stats->ls_last = ktime_to_us(ktime_get_real()); | |
8ddb7b00 SM |
465 | } |
466 | ||
467 | static inline void ocfs2_track_lock_refresh(struct ocfs2_lock_res *lockres) | |
468 | { | |
469 | lockres->l_lock_refresh++; | |
470 | } | |
471 | ||
5da844a2 GH |
472 | static inline void ocfs2_track_lock_wait(struct ocfs2_lock_res *lockres) |
473 | { | |
474 | struct ocfs2_mask_waiter *mw; | |
475 | ||
476 | if (list_empty(&lockres->l_mask_waiters)) { | |
477 | lockres->l_lock_wait = 0; | |
478 | return; | |
479 | } | |
480 | ||
481 | mw = list_first_entry(&lockres->l_mask_waiters, | |
482 | struct ocfs2_mask_waiter, mw_item); | |
483 | lockres->l_lock_wait = | |
484 | ktime_to_us(ktime_mono_to_real(mw->mw_lock_start)); | |
485 | } | |
486 | ||
8ddb7b00 SM |
487 | static inline void ocfs2_init_start_time(struct ocfs2_mask_waiter *mw) |
488 | { | |
5bc970e8 | 489 | mw->mw_lock_start = ktime_get(); |
8ddb7b00 SM |
490 | } |
491 | #else | |
492 | static inline void ocfs2_init_lock_stats(struct ocfs2_lock_res *res) | |
493 | { | |
494 | } | |
495 | static inline void ocfs2_update_lock_stats(struct ocfs2_lock_res *res, | |
496 | int level, struct ocfs2_mask_waiter *mw, int ret) | |
497 | { | |
498 | } | |
499 | static inline void ocfs2_track_lock_refresh(struct ocfs2_lock_res *lockres) | |
500 | { | |
501 | } | |
5da844a2 GH |
502 | static inline void ocfs2_track_lock_wait(struct ocfs2_lock_res *lockres) |
503 | { | |
504 | } | |
8ddb7b00 SM |
505 | static inline void ocfs2_init_start_time(struct ocfs2_mask_waiter *mw) |
506 | { | |
507 | } | |
508 | #endif | |
509 | ||
ccd979bd MF |
510 | static void ocfs2_lock_res_init_common(struct ocfs2_super *osb, |
511 | struct ocfs2_lock_res *res, | |
512 | enum ocfs2_lock_type type, | |
ccd979bd MF |
513 | struct ocfs2_lock_res_ops *ops, |
514 | void *priv) | |
515 | { | |
ccd979bd MF |
516 | res->l_type = type; |
517 | res->l_ops = ops; | |
518 | res->l_priv = priv; | |
519 | ||
bd3e7610 JB |
520 | res->l_level = DLM_LOCK_IV; |
521 | res->l_requested = DLM_LOCK_IV; | |
522 | res->l_blocking = DLM_LOCK_IV; | |
ccd979bd MF |
523 | res->l_action = OCFS2_AST_INVALID; |
524 | res->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
525 | ||
526 | res->l_flags = OCFS2_LOCK_INITIALIZED; | |
527 | ||
528 | ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug); | |
8ddb7b00 SM |
529 | |
530 | ocfs2_init_lock_stats(res); | |
cb25797d JK |
531 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
532 | if (type != OCFS2_LOCK_TYPE_OPEN) | |
533 | lockdep_init_map(&res->l_lockdep_map, ocfs2_lock_type_strings[type], | |
534 | &lockdep_keys[type], 0); | |
535 | else | |
536 | res->l_lockdep_map.key = NULL; | |
537 | #endif | |
ccd979bd MF |
538 | } |
539 | ||
540 | void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res) | |
541 | { | |
542 | /* This also clears out the lock status block */ | |
543 | memset(res, 0, sizeof(struct ocfs2_lock_res)); | |
544 | spin_lock_init(&res->l_lock); | |
545 | init_waitqueue_head(&res->l_event); | |
546 | INIT_LIST_HEAD(&res->l_blocked_list); | |
547 | INIT_LIST_HEAD(&res->l_mask_waiters); | |
439a36b8 | 548 | INIT_LIST_HEAD(&res->l_holders); |
ccd979bd MF |
549 | } |
550 | ||
551 | void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res, | |
552 | enum ocfs2_lock_type type, | |
24c19ef4 | 553 | unsigned int generation, |
ccd979bd MF |
554 | struct inode *inode) |
555 | { | |
556 | struct ocfs2_lock_res_ops *ops; | |
557 | ||
558 | switch(type) { | |
559 | case OCFS2_LOCK_TYPE_RW: | |
560 | ops = &ocfs2_inode_rw_lops; | |
561 | break; | |
562 | case OCFS2_LOCK_TYPE_META: | |
e63aecb6 | 563 | ops = &ocfs2_inode_inode_lops; |
ccd979bd | 564 | break; |
50008630 TY |
565 | case OCFS2_LOCK_TYPE_OPEN: |
566 | ops = &ocfs2_inode_open_lops; | |
567 | break; | |
ccd979bd MF |
568 | default: |
569 | mlog_bug_on_msg(1, "type: %d\n", type); | |
570 | ops = NULL; /* thanks, gcc */ | |
571 | break; | |
5b43d645 | 572 | } |
ccd979bd | 573 | |
d680efe9 | 574 | ocfs2_build_lock_name(type, OCFS2_I(inode)->ip_blkno, |
24c19ef4 | 575 | generation, res->l_name); |
d680efe9 MF |
576 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type, ops, inode); |
577 | } | |
578 | ||
54a7e755 MF |
579 | static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres) |
580 | { | |
581 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
582 | ||
583 | return OCFS2_SB(inode->i_sb); | |
584 | } | |
585 | ||
9e33d69f JK |
586 | static struct ocfs2_super *ocfs2_get_qinfo_osb(struct ocfs2_lock_res *lockres) |
587 | { | |
588 | struct ocfs2_mem_dqinfo *info = lockres->l_priv; | |
589 | ||
590 | return OCFS2_SB(info->dqi_gi.dqi_sb); | |
591 | } | |
592 | ||
cf8e06f1 MF |
593 | static struct ocfs2_super *ocfs2_get_file_osb(struct ocfs2_lock_res *lockres) |
594 | { | |
595 | struct ocfs2_file_private *fp = lockres->l_priv; | |
596 | ||
597 | return OCFS2_SB(fp->fp_file->f_mapping->host->i_sb); | |
598 | } | |
599 | ||
d680efe9 MF |
600 | static __u64 ocfs2_get_dentry_lock_ino(struct ocfs2_lock_res *lockres) |
601 | { | |
602 | __be64 inode_blkno_be; | |
603 | ||
604 | memcpy(&inode_blkno_be, &lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], | |
605 | sizeof(__be64)); | |
606 | ||
607 | return be64_to_cpu(inode_blkno_be); | |
608 | } | |
609 | ||
54a7e755 MF |
610 | static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres) |
611 | { | |
612 | struct ocfs2_dentry_lock *dl = lockres->l_priv; | |
613 | ||
614 | return OCFS2_SB(dl->dl_inode->i_sb); | |
615 | } | |
616 | ||
d680efe9 MF |
617 | void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl, |
618 | u64 parent, struct inode *inode) | |
619 | { | |
620 | int len; | |
621 | u64 inode_blkno = OCFS2_I(inode)->ip_blkno; | |
622 | __be64 inode_blkno_be = cpu_to_be64(inode_blkno); | |
623 | struct ocfs2_lock_res *lockres = &dl->dl_lockres; | |
624 | ||
625 | ocfs2_lock_res_init_once(lockres); | |
626 | ||
627 | /* | |
628 | * Unfortunately, the standard lock naming scheme won't work | |
629 | * here because we have two 16 byte values to use. Instead, | |
630 | * we'll stuff the inode number as a binary value. We still | |
631 | * want error prints to show something without garbling the | |
632 | * display, so drop a null byte in there before the inode | |
633 | * number. A future version of OCFS2 will likely use all | |
634 | * binary lock names. The stringified names have been a | |
635 | * tremendous aid in debugging, but now that the debugfs | |
636 | * interface exists, we can mangle things there if need be. | |
637 | * | |
638 | * NOTE: We also drop the standard "pad" value (the total lock | |
639 | * name size stays the same though - the last part is all | |
640 | * zeros due to the memset in ocfs2_lock_res_init_once() | |
641 | */ | |
642 | len = snprintf(lockres->l_name, OCFS2_DENTRY_LOCK_INO_START, | |
643 | "%c%016llx", | |
644 | ocfs2_lock_type_char(OCFS2_LOCK_TYPE_DENTRY), | |
645 | (long long)parent); | |
646 | ||
647 | BUG_ON(len != (OCFS2_DENTRY_LOCK_INO_START - 1)); | |
648 | ||
649 | memcpy(&lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], &inode_blkno_be, | |
650 | sizeof(__be64)); | |
651 | ||
652 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres, | |
653 | OCFS2_LOCK_TYPE_DENTRY, &ocfs2_dentry_lops, | |
654 | dl); | |
ccd979bd MF |
655 | } |
656 | ||
657 | static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res, | |
658 | struct ocfs2_super *osb) | |
659 | { | |
660 | /* Superblock lockres doesn't come from a slab so we call init | |
661 | * once on it manually. */ | |
662 | ocfs2_lock_res_init_once(res); | |
d680efe9 MF |
663 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_SUPER, OCFS2_SUPER_BLOCK_BLKNO, |
664 | 0, res->l_name); | |
ccd979bd | 665 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER, |
ccd979bd MF |
666 | &ocfs2_super_lops, osb); |
667 | } | |
668 | ||
669 | static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res, | |
670 | struct ocfs2_super *osb) | |
671 | { | |
672 | /* Rename lockres doesn't come from a slab so we call init | |
673 | * once on it manually. */ | |
674 | ocfs2_lock_res_init_once(res); | |
d680efe9 MF |
675 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_RENAME, 0, 0, res->l_name); |
676 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME, | |
ccd979bd MF |
677 | &ocfs2_rename_lops, osb); |
678 | } | |
679 | ||
6ca497a8 | 680 | static void ocfs2_nfs_sync_lock_res_init(struct ocfs2_lock_res *res, |
681 | struct ocfs2_super *osb) | |
682 | { | |
683 | /* nfs_sync lockres doesn't come from a slab so we call init | |
684 | * once on it manually. */ | |
685 | ocfs2_lock_res_init_once(res); | |
686 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_NFS_SYNC, 0, 0, res->l_name); | |
687 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_NFS_SYNC, | |
688 | &ocfs2_nfs_sync_lops, osb); | |
689 | } | |
690 | ||
4cd9973f JB |
691 | static void ocfs2_nfs_sync_lock_init(struct ocfs2_super *osb) |
692 | { | |
693 | ocfs2_nfs_sync_lock_res_init(&osb->osb_nfs_sync_lockres, osb); | |
694 | init_rwsem(&osb->nfs_sync_rwlock); | |
695 | } | |
696 | ||
4882abeb GH |
697 | void ocfs2_trim_fs_lock_res_init(struct ocfs2_super *osb) |
698 | { | |
699 | struct ocfs2_lock_res *lockres = &osb->osb_trim_fs_lockres; | |
700 | ||
5500ab4e GH |
701 | /* Only one trimfs thread are allowed to work at the same time. */ |
702 | mutex_lock(&osb->obs_trim_fs_mutex); | |
703 | ||
4882abeb GH |
704 | ocfs2_lock_res_init_once(lockres); |
705 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_TRIM_FS, 0, 0, lockres->l_name); | |
706 | ocfs2_lock_res_init_common(osb, lockres, OCFS2_LOCK_TYPE_TRIM_FS, | |
707 | &ocfs2_trim_fs_lops, osb); | |
708 | } | |
709 | ||
710 | void ocfs2_trim_fs_lock_res_uninit(struct ocfs2_super *osb) | |
711 | { | |
712 | struct ocfs2_lock_res *lockres = &osb->osb_trim_fs_lockres; | |
713 | ||
714 | ocfs2_simple_drop_lockres(osb, lockres); | |
715 | ocfs2_lock_res_free(lockres); | |
5500ab4e GH |
716 | |
717 | mutex_unlock(&osb->obs_trim_fs_mutex); | |
4882abeb GH |
718 | } |
719 | ||
83273932 SE |
720 | static void ocfs2_orphan_scan_lock_res_init(struct ocfs2_lock_res *res, |
721 | struct ocfs2_super *osb) | |
722 | { | |
83273932 SE |
723 | ocfs2_lock_res_init_once(res); |
724 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_ORPHAN_SCAN, 0, 0, res->l_name); | |
725 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_ORPHAN_SCAN, | |
726 | &ocfs2_orphan_scan_lops, osb); | |
83273932 SE |
727 | } |
728 | ||
cf8e06f1 MF |
729 | void ocfs2_file_lock_res_init(struct ocfs2_lock_res *lockres, |
730 | struct ocfs2_file_private *fp) | |
731 | { | |
732 | struct inode *inode = fp->fp_file->f_mapping->host; | |
733 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
734 | ||
735 | ocfs2_lock_res_init_once(lockres); | |
736 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_FLOCK, oi->ip_blkno, | |
737 | inode->i_generation, lockres->l_name); | |
738 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres, | |
739 | OCFS2_LOCK_TYPE_FLOCK, &ocfs2_flock_lops, | |
740 | fp); | |
741 | lockres->l_flags |= OCFS2_LOCK_NOCACHE; | |
742 | } | |
743 | ||
9e33d69f JK |
744 | void ocfs2_qinfo_lock_res_init(struct ocfs2_lock_res *lockres, |
745 | struct ocfs2_mem_dqinfo *info) | |
746 | { | |
747 | ocfs2_lock_res_init_once(lockres); | |
748 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_QINFO, info->dqi_gi.dqi_type, | |
749 | 0, lockres->l_name); | |
750 | ocfs2_lock_res_init_common(OCFS2_SB(info->dqi_gi.dqi_sb), lockres, | |
751 | OCFS2_LOCK_TYPE_QINFO, &ocfs2_qinfo_lops, | |
752 | info); | |
753 | } | |
754 | ||
8dec98ed TM |
755 | void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res *lockres, |
756 | struct ocfs2_super *osb, u64 ref_blkno, | |
757 | unsigned int generation) | |
758 | { | |
759 | ocfs2_lock_res_init_once(lockres); | |
760 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_REFCOUNT, ref_blkno, | |
761 | generation, lockres->l_name); | |
762 | ocfs2_lock_res_init_common(osb, lockres, OCFS2_LOCK_TYPE_REFCOUNT, | |
763 | &ocfs2_refcount_block_lops, osb); | |
764 | } | |
765 | ||
ccd979bd MF |
766 | void ocfs2_lock_res_free(struct ocfs2_lock_res *res) |
767 | { | |
ccd979bd MF |
768 | if (!(res->l_flags & OCFS2_LOCK_INITIALIZED)) |
769 | return; | |
770 | ||
771 | ocfs2_remove_lockres_tracking(res); | |
772 | ||
773 | mlog_bug_on_msg(!list_empty(&res->l_blocked_list), | |
774 | "Lockres %s is on the blocked list\n", | |
775 | res->l_name); | |
776 | mlog_bug_on_msg(!list_empty(&res->l_mask_waiters), | |
777 | "Lockres %s has mask waiters pending\n", | |
778 | res->l_name); | |
779 | mlog_bug_on_msg(spin_is_locked(&res->l_lock), | |
780 | "Lockres %s is locked\n", | |
781 | res->l_name); | |
782 | mlog_bug_on_msg(res->l_ro_holders, | |
783 | "Lockres %s has %u ro holders\n", | |
784 | res->l_name, res->l_ro_holders); | |
785 | mlog_bug_on_msg(res->l_ex_holders, | |
786 | "Lockres %s has %u ex holders\n", | |
787 | res->l_name, res->l_ex_holders); | |
788 | ||
789 | /* Need to clear out the lock status block for the dlm */ | |
790 | memset(&res->l_lksb, 0, sizeof(res->l_lksb)); | |
791 | ||
792 | res->l_flags = 0UL; | |
ccd979bd MF |
793 | } |
794 | ||
439a36b8 ER |
795 | /* |
796 | * Keep a list of processes who have interest in a lockres. | |
797 | * Note: this is now only uesed for check recursive cluster locking. | |
798 | */ | |
799 | static inline void ocfs2_add_holder(struct ocfs2_lock_res *lockres, | |
800 | struct ocfs2_lock_holder *oh) | |
801 | { | |
802 | INIT_LIST_HEAD(&oh->oh_list); | |
803 | oh->oh_owner_pid = get_pid(task_pid(current)); | |
804 | ||
805 | spin_lock(&lockres->l_lock); | |
806 | list_add_tail(&oh->oh_list, &lockres->l_holders); | |
807 | spin_unlock(&lockres->l_lock); | |
808 | } | |
809 | ||
133b81f2 LC |
810 | static struct ocfs2_lock_holder * |
811 | ocfs2_pid_holder(struct ocfs2_lock_res *lockres, | |
812 | struct pid *pid) | |
439a36b8 ER |
813 | { |
814 | struct ocfs2_lock_holder *oh; | |
439a36b8 | 815 | |
439a36b8 | 816 | spin_lock(&lockres->l_lock); |
439a36b8 ER |
817 | list_for_each_entry(oh, &lockres->l_holders, oh_list) { |
818 | if (oh->oh_owner_pid == pid) { | |
819 | spin_unlock(&lockres->l_lock); | |
133b81f2 | 820 | return oh; |
439a36b8 ER |
821 | } |
822 | } | |
823 | spin_unlock(&lockres->l_lock); | |
133b81f2 LC |
824 | return NULL; |
825 | } | |
439a36b8 | 826 | |
133b81f2 LC |
827 | static inline void ocfs2_remove_holder(struct ocfs2_lock_res *lockres, |
828 | struct ocfs2_lock_holder *oh) | |
829 | { | |
830 | spin_lock(&lockres->l_lock); | |
831 | list_del(&oh->oh_list); | |
832 | spin_unlock(&lockres->l_lock); | |
833 | ||
834 | put_pid(oh->oh_owner_pid); | |
439a36b8 ER |
835 | } |
836 | ||
133b81f2 | 837 | |
ccd979bd MF |
838 | static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres, |
839 | int level) | |
840 | { | |
ccd979bd MF |
841 | BUG_ON(!lockres); |
842 | ||
843 | switch(level) { | |
bd3e7610 | 844 | case DLM_LOCK_EX: |
ccd979bd MF |
845 | lockres->l_ex_holders++; |
846 | break; | |
bd3e7610 | 847 | case DLM_LOCK_PR: |
ccd979bd MF |
848 | lockres->l_ro_holders++; |
849 | break; | |
850 | default: | |
851 | BUG(); | |
852 | } | |
ccd979bd MF |
853 | } |
854 | ||
855 | static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres, | |
856 | int level) | |
857 | { | |
ccd979bd MF |
858 | BUG_ON(!lockres); |
859 | ||
860 | switch(level) { | |
bd3e7610 | 861 | case DLM_LOCK_EX: |
ccd979bd MF |
862 | BUG_ON(!lockres->l_ex_holders); |
863 | lockres->l_ex_holders--; | |
864 | break; | |
bd3e7610 | 865 | case DLM_LOCK_PR: |
ccd979bd MF |
866 | BUG_ON(!lockres->l_ro_holders); |
867 | lockres->l_ro_holders--; | |
868 | break; | |
869 | default: | |
870 | BUG(); | |
871 | } | |
ccd979bd MF |
872 | } |
873 | ||
874 | /* WARNING: This function lives in a world where the only three lock | |
875 | * levels are EX, PR, and NL. It *will* have to be adjusted when more | |
876 | * lock types are added. */ | |
877 | static inline int ocfs2_highest_compat_lock_level(int level) | |
878 | { | |
bd3e7610 | 879 | int new_level = DLM_LOCK_EX; |
ccd979bd | 880 | |
bd3e7610 JB |
881 | if (level == DLM_LOCK_EX) |
882 | new_level = DLM_LOCK_NL; | |
883 | else if (level == DLM_LOCK_PR) | |
884 | new_level = DLM_LOCK_PR; | |
ccd979bd MF |
885 | return new_level; |
886 | } | |
887 | ||
888 | static void lockres_set_flags(struct ocfs2_lock_res *lockres, | |
889 | unsigned long newflags) | |
890 | { | |
800deef3 | 891 | struct ocfs2_mask_waiter *mw, *tmp; |
ccd979bd MF |
892 | |
893 | assert_spin_locked(&lockres->l_lock); | |
894 | ||
895 | lockres->l_flags = newflags; | |
896 | ||
800deef3 | 897 | list_for_each_entry_safe(mw, tmp, &lockres->l_mask_waiters, mw_item) { |
ccd979bd MF |
898 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) |
899 | continue; | |
900 | ||
901 | list_del_init(&mw->mw_item); | |
902 | mw->mw_status = 0; | |
903 | complete(&mw->mw_complete); | |
5da844a2 | 904 | ocfs2_track_lock_wait(lockres); |
ccd979bd MF |
905 | } |
906 | } | |
907 | static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or) | |
908 | { | |
909 | lockres_set_flags(lockres, lockres->l_flags | or); | |
910 | } | |
911 | static void lockres_clear_flags(struct ocfs2_lock_res *lockres, | |
912 | unsigned long clear) | |
913 | { | |
914 | lockres_set_flags(lockres, lockres->l_flags & ~clear); | |
915 | } | |
916 | ||
917 | static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres) | |
918 | { | |
ccd979bd MF |
919 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); |
920 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); | |
921 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
bd3e7610 | 922 | BUG_ON(lockres->l_blocking <= DLM_LOCK_NL); |
ccd979bd MF |
923 | |
924 | lockres->l_level = lockres->l_requested; | |
925 | if (lockres->l_level <= | |
926 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) { | |
bd3e7610 | 927 | lockres->l_blocking = DLM_LOCK_NL; |
ccd979bd MF |
928 | lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED); |
929 | } | |
930 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
ccd979bd MF |
931 | } |
932 | ||
933 | static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres) | |
934 | { | |
ccd979bd MF |
935 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); |
936 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); | |
937 | ||
938 | /* Convert from RO to EX doesn't really need anything as our | |
939 | * information is already up to data. Convert from NL to | |
940 | * *anything* however should mark ourselves as needing an | |
941 | * update */ | |
bd3e7610 | 942 | if (lockres->l_level == DLM_LOCK_NL && |
f625c979 | 943 | lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) |
ccd979bd MF |
944 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
945 | ||
946 | lockres->l_level = lockres->l_requested; | |
a1912826 SM |
947 | |
948 | /* | |
949 | * We set the OCFS2_LOCK_UPCONVERT_FINISHING flag before clearing | |
950 | * the OCFS2_LOCK_BUSY flag to prevent the dc thread from | |
951 | * downconverting the lock before the upconvert has fully completed. | |
d1e78238 X |
952 | * Do not prevent the dc thread from downconverting if NONBLOCK lock |
953 | * had already returned. | |
a1912826 | 954 | */ |
d1e78238 X |
955 | if (!(lockres->l_flags & OCFS2_LOCK_NONBLOCK_FINISHED)) |
956 | lockres_or_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING); | |
957 | else | |
958 | lockres_clear_flags(lockres, OCFS2_LOCK_NONBLOCK_FINISHED); | |
a1912826 | 959 | |
ccd979bd | 960 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); |
ccd979bd MF |
961 | } |
962 | ||
963 | static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres) | |
964 | { | |
3cf0c507 | 965 | BUG_ON((!(lockres->l_flags & OCFS2_LOCK_BUSY))); |
ccd979bd MF |
966 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); |
967 | ||
bd3e7610 | 968 | if (lockres->l_requested > DLM_LOCK_NL && |
f625c979 MF |
969 | !(lockres->l_flags & OCFS2_LOCK_LOCAL) && |
970 | lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) | |
ccd979bd MF |
971 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
972 | ||
973 | lockres->l_level = lockres->l_requested; | |
974 | lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED); | |
975 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
ccd979bd MF |
976 | } |
977 | ||
ccd979bd MF |
978 | static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, |
979 | int level) | |
980 | { | |
981 | int needs_downconvert = 0; | |
ccd979bd MF |
982 | |
983 | assert_spin_locked(&lockres->l_lock); | |
984 | ||
ccd979bd MF |
985 | if (level > lockres->l_blocking) { |
986 | /* only schedule a downconvert if we haven't already scheduled | |
987 | * one that goes low enough to satisfy the level we're | |
988 | * blocking. this also catches the case where we get | |
989 | * duplicate BASTs */ | |
990 | if (ocfs2_highest_compat_lock_level(level) < | |
991 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) | |
992 | needs_downconvert = 1; | |
993 | ||
994 | lockres->l_blocking = level; | |
995 | } | |
996 | ||
9b915181 SM |
997 | mlog(ML_BASTS, "lockres %s, block %d, level %d, l_block %d, dwn %d\n", |
998 | lockres->l_name, level, lockres->l_level, lockres->l_blocking, | |
999 | needs_downconvert); | |
1000 | ||
0b94a909 WW |
1001 | if (needs_downconvert) |
1002 | lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); | |
c1e8d35e | 1003 | mlog(0, "needs_downconvert = %d\n", needs_downconvert); |
ccd979bd MF |
1004 | return needs_downconvert; |
1005 | } | |
1006 | ||
de551246 JB |
1007 | /* |
1008 | * OCFS2_LOCK_PENDING and l_pending_gen. | |
1009 | * | |
1010 | * Why does OCFS2_LOCK_PENDING exist? To close a race between setting | |
1011 | * OCFS2_LOCK_BUSY and calling ocfs2_dlm_lock(). See ocfs2_unblock_lock() | |
1012 | * for more details on the race. | |
1013 | * | |
1014 | * OCFS2_LOCK_PENDING closes the race quite nicely. However, it introduces | |
1015 | * a race on itself. In o2dlm, we can get the ast before ocfs2_dlm_lock() | |
1016 | * returns. The ast clears OCFS2_LOCK_BUSY, and must therefore clear | |
1017 | * OCFS2_LOCK_PENDING at the same time. When ocfs2_dlm_lock() returns, | |
1018 | * the caller is going to try to clear PENDING again. If nothing else is | |
1019 | * happening, __lockres_clear_pending() sees PENDING is unset and does | |
1020 | * nothing. | |
1021 | * | |
1022 | * But what if another path (eg downconvert thread) has just started a | |
1023 | * new locking action? The other path has re-set PENDING. Our path | |
1024 | * cannot clear PENDING, because that will re-open the original race | |
1025 | * window. | |
1026 | * | |
1027 | * [Example] | |
1028 | * | |
1029 | * ocfs2_meta_lock() | |
1030 | * ocfs2_cluster_lock() | |
1031 | * set BUSY | |
1032 | * set PENDING | |
1033 | * drop l_lock | |
1034 | * ocfs2_dlm_lock() | |
1035 | * ocfs2_locking_ast() ocfs2_downconvert_thread() | |
1036 | * clear PENDING ocfs2_unblock_lock() | |
1037 | * take_l_lock | |
1038 | * !BUSY | |
1039 | * ocfs2_prepare_downconvert() | |
1040 | * set BUSY | |
1041 | * set PENDING | |
1042 | * drop l_lock | |
1043 | * take l_lock | |
1044 | * clear PENDING | |
1045 | * drop l_lock | |
1046 | * <window> | |
1047 | * ocfs2_dlm_lock() | |
1048 | * | |
1049 | * So as you can see, we now have a window where l_lock is not held, | |
1050 | * PENDING is not set, and ocfs2_dlm_lock() has not been called. | |
1051 | * | |
1052 | * The core problem is that ocfs2_cluster_lock() has cleared the PENDING | |
1053 | * set by ocfs2_prepare_downconvert(). That wasn't nice. | |
1054 | * | |
1055 | * To solve this we introduce l_pending_gen. A call to | |
1056 | * lockres_clear_pending() will only do so when it is passed a generation | |
1057 | * number that matches the lockres. lockres_set_pending() will return the | |
1058 | * current generation number. When ocfs2_cluster_lock() goes to clear | |
1059 | * PENDING, it passes the generation it got from set_pending(). In our | |
1060 | * example above, the generation numbers will *not* match. Thus, | |
1061 | * ocfs2_cluster_lock() will not clear the PENDING set by | |
1062 | * ocfs2_prepare_downconvert(). | |
1063 | */ | |
1064 | ||
1065 | /* Unlocked version for ocfs2_locking_ast() */ | |
1066 | static void __lockres_clear_pending(struct ocfs2_lock_res *lockres, | |
1067 | unsigned int generation, | |
1068 | struct ocfs2_super *osb) | |
1069 | { | |
1070 | assert_spin_locked(&lockres->l_lock); | |
1071 | ||
1072 | /* | |
1073 | * The ast and locking functions can race us here. The winner | |
1074 | * will clear pending, the loser will not. | |
1075 | */ | |
1076 | if (!(lockres->l_flags & OCFS2_LOCK_PENDING) || | |
1077 | (lockres->l_pending_gen != generation)) | |
1078 | return; | |
1079 | ||
1080 | lockres_clear_flags(lockres, OCFS2_LOCK_PENDING); | |
1081 | lockres->l_pending_gen++; | |
1082 | ||
1083 | /* | |
1084 | * The downconvert thread may have skipped us because we | |
1085 | * were PENDING. Wake it up. | |
1086 | */ | |
1087 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) | |
1088 | ocfs2_wake_downconvert_thread(osb); | |
1089 | } | |
1090 | ||
1091 | /* Locked version for callers of ocfs2_dlm_lock() */ | |
1092 | static void lockres_clear_pending(struct ocfs2_lock_res *lockres, | |
1093 | unsigned int generation, | |
1094 | struct ocfs2_super *osb) | |
1095 | { | |
1096 | unsigned long flags; | |
1097 | ||
1098 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1099 | __lockres_clear_pending(lockres, generation, osb); | |
1100 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1101 | } | |
1102 | ||
1103 | static unsigned int lockres_set_pending(struct ocfs2_lock_res *lockres) | |
1104 | { | |
1105 | assert_spin_locked(&lockres->l_lock); | |
1106 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); | |
1107 | ||
1108 | lockres_or_flags(lockres, OCFS2_LOCK_PENDING); | |
1109 | ||
1110 | return lockres->l_pending_gen; | |
1111 | } | |
1112 | ||
c0e41338 | 1113 | static void ocfs2_blocking_ast(struct ocfs2_dlm_lksb *lksb, int level) |
ccd979bd | 1114 | { |
a796d286 | 1115 | struct ocfs2_lock_res *lockres = ocfs2_lksb_to_lock_res(lksb); |
aa2623ad | 1116 | struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); |
ccd979bd MF |
1117 | int needs_downconvert; |
1118 | unsigned long flags; | |
1119 | ||
bd3e7610 | 1120 | BUG_ON(level <= DLM_LOCK_NL); |
ccd979bd | 1121 | |
9b915181 SM |
1122 | mlog(ML_BASTS, "BAST fired for lockres %s, blocking %d, level %d, " |
1123 | "type %s\n", lockres->l_name, level, lockres->l_level, | |
aa2623ad MF |
1124 | ocfs2_lock_type_string(lockres->l_type)); |
1125 | ||
cf8e06f1 MF |
1126 | /* |
1127 | * We can skip the bast for locks which don't enable caching - | |
1128 | * they'll be dropped at the earliest possible time anyway. | |
1129 | */ | |
1130 | if (lockres->l_flags & OCFS2_LOCK_NOCACHE) | |
1131 | return; | |
1132 | ||
ccd979bd MF |
1133 | spin_lock_irqsave(&lockres->l_lock, flags); |
1134 | needs_downconvert = ocfs2_generic_handle_bast(lockres, level); | |
1135 | if (needs_downconvert) | |
1136 | ocfs2_schedule_blocked_lock(osb, lockres); | |
1137 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1138 | ||
d680efe9 MF |
1139 | wake_up(&lockres->l_event); |
1140 | ||
34d024f8 | 1141 | ocfs2_wake_downconvert_thread(osb); |
ccd979bd MF |
1142 | } |
1143 | ||
c0e41338 | 1144 | static void ocfs2_locking_ast(struct ocfs2_dlm_lksb *lksb) |
ccd979bd | 1145 | { |
a796d286 | 1146 | struct ocfs2_lock_res *lockres = ocfs2_lksb_to_lock_res(lksb); |
de551246 | 1147 | struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); |
ccd979bd | 1148 | unsigned long flags; |
1693a5c0 | 1149 | int status; |
ccd979bd MF |
1150 | |
1151 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1152 | ||
1693a5c0 DT |
1153 | status = ocfs2_dlm_lock_status(&lockres->l_lksb); |
1154 | ||
1155 | if (status == -EAGAIN) { | |
1156 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
1157 | goto out; | |
1158 | } | |
1159 | ||
1160 | if (status) { | |
8f2c9c1b | 1161 | mlog(ML_ERROR, "lockres %s: lksb status value of %d!\n", |
1693a5c0 | 1162 | lockres->l_name, status); |
ccd979bd MF |
1163 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1164 | return; | |
1165 | } | |
1166 | ||
9b915181 SM |
1167 | mlog(ML_BASTS, "AST fired for lockres %s, action %d, unlock %d, " |
1168 | "level %d => %d\n", lockres->l_name, lockres->l_action, | |
1169 | lockres->l_unlock_action, lockres->l_level, lockres->l_requested); | |
1170 | ||
ccd979bd MF |
1171 | switch(lockres->l_action) { |
1172 | case OCFS2_AST_ATTACH: | |
1173 | ocfs2_generic_handle_attach_action(lockres); | |
e92d57df | 1174 | lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL); |
ccd979bd MF |
1175 | break; |
1176 | case OCFS2_AST_CONVERT: | |
1177 | ocfs2_generic_handle_convert_action(lockres); | |
1178 | break; | |
1179 | case OCFS2_AST_DOWNCONVERT: | |
1180 | ocfs2_generic_handle_downconvert_action(lockres); | |
1181 | break; | |
1182 | default: | |
9b915181 SM |
1183 | mlog(ML_ERROR, "lockres %s: AST fired with invalid action: %u, " |
1184 | "flags 0x%lx, unlock: %u\n", | |
e92d57df MF |
1185 | lockres->l_name, lockres->l_action, lockres->l_flags, |
1186 | lockres->l_unlock_action); | |
ccd979bd MF |
1187 | BUG(); |
1188 | } | |
1693a5c0 | 1189 | out: |
ccd979bd MF |
1190 | /* set it to something invalid so if we get called again we |
1191 | * can catch it. */ | |
1192 | lockres->l_action = OCFS2_AST_INVALID; | |
ccd979bd | 1193 | |
de551246 JB |
1194 | /* Did we try to cancel this lock? Clear that state */ |
1195 | if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) | |
1196 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
1197 | ||
1198 | /* | |
1199 | * We may have beaten the locking functions here. We certainly | |
1200 | * know that dlm_lock() has been called :-) | |
1201 | * Because we can't have two lock calls in flight at once, we | |
1202 | * can use lockres->l_pending_gen. | |
1203 | */ | |
1204 | __lockres_clear_pending(lockres, lockres->l_pending_gen, osb); | |
1205 | ||
ccd979bd | 1206 | wake_up(&lockres->l_event); |
d680efe9 | 1207 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
ccd979bd MF |
1208 | } |
1209 | ||
553b5eb9 JB |
1210 | static void ocfs2_unlock_ast(struct ocfs2_dlm_lksb *lksb, int error) |
1211 | { | |
1212 | struct ocfs2_lock_res *lockres = ocfs2_lksb_to_lock_res(lksb); | |
1213 | unsigned long flags; | |
1214 | ||
9b915181 SM |
1215 | mlog(ML_BASTS, "UNLOCK AST fired for lockres %s, action = %d\n", |
1216 | lockres->l_name, lockres->l_unlock_action); | |
553b5eb9 JB |
1217 | |
1218 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1219 | if (error) { | |
1220 | mlog(ML_ERROR, "Dlm passes error %d for lock %s, " | |
1221 | "unlock_action %d\n", error, lockres->l_name, | |
1222 | lockres->l_unlock_action); | |
1223 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
553b5eb9 JB |
1224 | return; |
1225 | } | |
1226 | ||
1227 | switch(lockres->l_unlock_action) { | |
1228 | case OCFS2_UNLOCK_CANCEL_CONVERT: | |
1229 | mlog(0, "Cancel convert success for %s\n", lockres->l_name); | |
1230 | lockres->l_action = OCFS2_AST_INVALID; | |
1231 | /* Downconvert thread may have requeued this lock, we | |
1232 | * need to wake it. */ | |
1233 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) | |
1234 | ocfs2_wake_downconvert_thread(ocfs2_get_lockres_osb(lockres)); | |
1235 | break; | |
1236 | case OCFS2_UNLOCK_DROP_LOCK: | |
1237 | lockres->l_level = DLM_LOCK_IV; | |
1238 | break; | |
1239 | default: | |
1240 | BUG(); | |
1241 | } | |
1242 | ||
1243 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
1244 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
1245 | wake_up(&lockres->l_event); | |
1246 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
553b5eb9 JB |
1247 | } |
1248 | ||
1249 | /* | |
1250 | * This is the filesystem locking protocol. It provides the lock handling | |
1251 | * hooks for the underlying DLM. It has a maximum version number. | |
1252 | * The version number allows interoperability with systems running at | |
1253 | * the same major number and an equal or smaller minor number. | |
1254 | * | |
1255 | * Whenever the filesystem does new things with locks (adds or removes a | |
1256 | * lock, orders them differently, does different things underneath a lock), | |
1257 | * the version must be changed. The protocol is negotiated when joining | |
1258 | * the dlm domain. A node may join the domain if its major version is | |
1259 | * identical to all other nodes and its minor version is greater than | |
1260 | * or equal to all other nodes. When its minor version is greater than | |
1261 | * the other nodes, it will run at the minor version specified by the | |
1262 | * other nodes. | |
1263 | * | |
1264 | * If a locking change is made that will not be compatible with older | |
1265 | * versions, the major number must be increased and the minor version set | |
1266 | * to zero. If a change merely adds a behavior that can be disabled when | |
1267 | * speaking to older versions, the minor version must be increased. If a | |
1268 | * change adds a fully backwards compatible change (eg, LVB changes that | |
1269 | * are just ignored by older versions), the version does not need to be | |
1270 | * updated. | |
1271 | */ | |
1272 | static struct ocfs2_locking_protocol lproto = { | |
1273 | .lp_max_version = { | |
1274 | .pv_major = OCFS2_LOCKING_PROTOCOL_MAJOR, | |
1275 | .pv_minor = OCFS2_LOCKING_PROTOCOL_MINOR, | |
1276 | }, | |
1277 | .lp_lock_ast = ocfs2_locking_ast, | |
1278 | .lp_blocking_ast = ocfs2_blocking_ast, | |
1279 | .lp_unlock_ast = ocfs2_unlock_ast, | |
1280 | }; | |
1281 | ||
1282 | void ocfs2_set_locking_protocol(void) | |
1283 | { | |
1284 | ocfs2_stack_glue_set_max_proto_version(&lproto.lp_max_version); | |
1285 | } | |
1286 | ||
ccd979bd MF |
1287 | static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, |
1288 | int convert) | |
1289 | { | |
1290 | unsigned long flags; | |
1291 | ||
ccd979bd MF |
1292 | spin_lock_irqsave(&lockres->l_lock, flags); |
1293 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
a1912826 | 1294 | lockres_clear_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING); |
ccd979bd MF |
1295 | if (convert) |
1296 | lockres->l_action = OCFS2_AST_INVALID; | |
1297 | else | |
1298 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
1299 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1300 | ||
1301 | wake_up(&lockres->l_event); | |
ccd979bd MF |
1302 | } |
1303 | ||
1304 | /* Note: If we detect another process working on the lock (i.e., | |
1305 | * OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller | |
1306 | * to do the right thing in that case. | |
1307 | */ | |
1308 | static int ocfs2_lock_create(struct ocfs2_super *osb, | |
1309 | struct ocfs2_lock_res *lockres, | |
1310 | int level, | |
bd3e7610 | 1311 | u32 dlm_flags) |
ccd979bd MF |
1312 | { |
1313 | int ret = 0; | |
ccd979bd | 1314 | unsigned long flags; |
de551246 | 1315 | unsigned int gen; |
ccd979bd | 1316 | |
bd3e7610 | 1317 | mlog(0, "lock %s, level = %d, flags = %u\n", lockres->l_name, level, |
ccd979bd MF |
1318 | dlm_flags); |
1319 | ||
1320 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1321 | if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) || | |
1322 | (lockres->l_flags & OCFS2_LOCK_BUSY)) { | |
1323 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1324 | goto bail; | |
1325 | } | |
1326 | ||
1327 | lockres->l_action = OCFS2_AST_ATTACH; | |
1328 | lockres->l_requested = level; | |
1329 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
de551246 | 1330 | gen = lockres_set_pending(lockres); |
ccd979bd MF |
1331 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1332 | ||
4670c46d | 1333 | ret = ocfs2_dlm_lock(osb->cconn, |
7431cd7e JB |
1334 | level, |
1335 | &lockres->l_lksb, | |
1336 | dlm_flags, | |
1337 | lockres->l_name, | |
a796d286 | 1338 | OCFS2_LOCK_ID_MAX_LEN - 1); |
de551246 | 1339 | lockres_clear_pending(lockres, gen, osb); |
7431cd7e JB |
1340 | if (ret) { |
1341 | ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres); | |
ccd979bd MF |
1342 | ocfs2_recover_from_dlm_error(lockres, 1); |
1343 | } | |
1344 | ||
7431cd7e | 1345 | mlog(0, "lock %s, return from ocfs2_dlm_lock\n", lockres->l_name); |
ccd979bd MF |
1346 | |
1347 | bail: | |
ccd979bd MF |
1348 | return ret; |
1349 | } | |
1350 | ||
1351 | static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres, | |
1352 | int flag) | |
1353 | { | |
1354 | unsigned long flags; | |
1355 | int ret; | |
1356 | ||
1357 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1358 | ret = lockres->l_flags & flag; | |
1359 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1360 | ||
1361 | return ret; | |
1362 | } | |
1363 | ||
1364 | static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres) | |
1365 | ||
1366 | { | |
1367 | wait_event(lockres->l_event, | |
1368 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY)); | |
1369 | } | |
1370 | ||
1371 | static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres) | |
1372 | ||
1373 | { | |
1374 | wait_event(lockres->l_event, | |
1375 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING)); | |
1376 | } | |
1377 | ||
1378 | /* predict what lock level we'll be dropping down to on behalf | |
1379 | * of another node, and return true if the currently wanted | |
1380 | * level will be compatible with it. */ | |
1381 | static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, | |
1382 | int wanted) | |
1383 | { | |
1384 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
1385 | ||
1386 | return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking); | |
1387 | } | |
1388 | ||
1389 | static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw) | |
1390 | { | |
1391 | INIT_LIST_HEAD(&mw->mw_item); | |
1392 | init_completion(&mw->mw_complete); | |
8ddb7b00 | 1393 | ocfs2_init_start_time(mw); |
ccd979bd MF |
1394 | } |
1395 | ||
1396 | static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw) | |
1397 | { | |
1398 | wait_for_completion(&mw->mw_complete); | |
1399 | /* Re-arm the completion in case we want to wait on it again */ | |
16735d02 | 1400 | reinit_completion(&mw->mw_complete); |
ccd979bd MF |
1401 | return mw->mw_status; |
1402 | } | |
1403 | ||
1404 | static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres, | |
1405 | struct ocfs2_mask_waiter *mw, | |
1406 | unsigned long mask, | |
1407 | unsigned long goal) | |
1408 | { | |
1409 | BUG_ON(!list_empty(&mw->mw_item)); | |
1410 | ||
1411 | assert_spin_locked(&lockres->l_lock); | |
1412 | ||
1413 | list_add_tail(&mw->mw_item, &lockres->l_mask_waiters); | |
1414 | mw->mw_mask = mask; | |
1415 | mw->mw_goal = goal; | |
5da844a2 | 1416 | ocfs2_track_lock_wait(lockres); |
ccd979bd MF |
1417 | } |
1418 | ||
1419 | /* returns 0 if the mw that was removed was already satisfied, -EBUSY | |
1420 | * if the mask still hadn't reached its goal */ | |
d1e78238 | 1421 | static int __lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres, |
ccd979bd MF |
1422 | struct ocfs2_mask_waiter *mw) |
1423 | { | |
ccd979bd MF |
1424 | int ret = 0; |
1425 | ||
d1e78238 | 1426 | assert_spin_locked(&lockres->l_lock); |
ccd979bd MF |
1427 | if (!list_empty(&mw->mw_item)) { |
1428 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) | |
1429 | ret = -EBUSY; | |
1430 | ||
1431 | list_del_init(&mw->mw_item); | |
1432 | init_completion(&mw->mw_complete); | |
5da844a2 | 1433 | ocfs2_track_lock_wait(lockres); |
ccd979bd | 1434 | } |
d1e78238 X |
1435 | |
1436 | return ret; | |
1437 | } | |
1438 | ||
1439 | static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres, | |
1440 | struct ocfs2_mask_waiter *mw) | |
1441 | { | |
1442 | unsigned long flags; | |
1443 | int ret = 0; | |
1444 | ||
1445 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1446 | ret = __lockres_remove_mask_waiter(lockres, mw); | |
ccd979bd MF |
1447 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1448 | ||
1449 | return ret; | |
1450 | ||
1451 | } | |
1452 | ||
cf8e06f1 MF |
1453 | static int ocfs2_wait_for_mask_interruptible(struct ocfs2_mask_waiter *mw, |
1454 | struct ocfs2_lock_res *lockres) | |
1455 | { | |
1456 | int ret; | |
1457 | ||
1458 | ret = wait_for_completion_interruptible(&mw->mw_complete); | |
1459 | if (ret) | |
1460 | lockres_remove_mask_waiter(lockres, mw); | |
1461 | else | |
1462 | ret = mw->mw_status; | |
1463 | /* Re-arm the completion in case we want to wait on it again */ | |
16735d02 | 1464 | reinit_completion(&mw->mw_complete); |
cf8e06f1 MF |
1465 | return ret; |
1466 | } | |
1467 | ||
cb25797d JK |
1468 | static int __ocfs2_cluster_lock(struct ocfs2_super *osb, |
1469 | struct ocfs2_lock_res *lockres, | |
1470 | int level, | |
1471 | u32 lkm_flags, | |
1472 | int arg_flags, | |
1473 | int l_subclass, | |
1474 | unsigned long caller_ip) | |
ccd979bd MF |
1475 | { |
1476 | struct ocfs2_mask_waiter mw; | |
ccd979bd MF |
1477 | int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR); |
1478 | int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */ | |
1479 | unsigned long flags; | |
de551246 | 1480 | unsigned int gen; |
1693a5c0 | 1481 | int noqueue_attempted = 0; |
d1e78238 | 1482 | int dlm_locked = 0; |
b1b1e15e | 1483 | int kick_dc = 0; |
ccd979bd | 1484 | |
2f2eca20 | 1485 | if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) { |
1486 | mlog_errno(-EINVAL); | |
1487 | return -EINVAL; | |
1488 | } | |
1489 | ||
ccd979bd MF |
1490 | ocfs2_init_mask_waiter(&mw); |
1491 | ||
b80fc012 | 1492 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
bd3e7610 | 1493 | lkm_flags |= DLM_LKF_VALBLK; |
b80fc012 | 1494 | |
ccd979bd MF |
1495 | again: |
1496 | wait = 0; | |
1497 | ||
a1912826 SM |
1498 | spin_lock_irqsave(&lockres->l_lock, flags); |
1499 | ||
ccd979bd MF |
1500 | if (catch_signals && signal_pending(current)) { |
1501 | ret = -ERESTARTSYS; | |
a1912826 | 1502 | goto unlock; |
ccd979bd MF |
1503 | } |
1504 | ||
ccd979bd MF |
1505 | mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING, |
1506 | "Cluster lock called on freeing lockres %s! flags " | |
1507 | "0x%lx\n", lockres->l_name, lockres->l_flags); | |
1508 | ||
1509 | /* We only compare against the currently granted level | |
1510 | * here. If the lock is blocked waiting on a downconvert, | |
1511 | * we'll get caught below. */ | |
1512 | if (lockres->l_flags & OCFS2_LOCK_BUSY && | |
1513 | level > lockres->l_level) { | |
1514 | /* is someone sitting in dlm_lock? If so, wait on | |
1515 | * them. */ | |
1516 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
1517 | wait = 1; | |
1518 | goto unlock; | |
1519 | } | |
1520 | ||
a1912826 SM |
1521 | if (lockres->l_flags & OCFS2_LOCK_UPCONVERT_FINISHING) { |
1522 | /* | |
1523 | * We've upconverted. If the lock now has a level we can | |
1524 | * work with, we take it. If, however, the lock is not at the | |
1525 | * required level, we go thru the full cycle. One way this could | |
1526 | * happen is if a process requesting an upconvert to PR is | |
1527 | * closely followed by another requesting upconvert to an EX. | |
1528 | * If the process requesting EX lands here, we want it to | |
1529 | * continue attempting to upconvert and let the process | |
1530 | * requesting PR take the lock. | |
1531 | * If multiple processes request upconvert to PR, the first one | |
1532 | * here will take the lock. The others will have to go thru the | |
1533 | * OCFS2_LOCK_BLOCKED check to ensure that there is no pending | |
1534 | * downconvert request. | |
1535 | */ | |
1536 | if (level <= lockres->l_level) | |
1537 | goto update_holders; | |
1538 | } | |
1539 | ||
ccd979bd MF |
1540 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED && |
1541 | !ocfs2_may_continue_on_blocked_lock(lockres, level)) { | |
1542 | /* is the lock is currently blocked on behalf of | |
1543 | * another node */ | |
1544 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0); | |
1545 | wait = 1; | |
1546 | goto unlock; | |
1547 | } | |
1548 | ||
1549 | if (level > lockres->l_level) { | |
1693a5c0 DT |
1550 | if (noqueue_attempted > 0) { |
1551 | ret = -EAGAIN; | |
1552 | goto unlock; | |
1553 | } | |
1554 | if (lkm_flags & DLM_LKF_NOQUEUE) | |
1555 | noqueue_attempted = 1; | |
1556 | ||
ccd979bd MF |
1557 | if (lockres->l_action != OCFS2_AST_INVALID) |
1558 | mlog(ML_ERROR, "lockres %s has action %u pending\n", | |
1559 | lockres->l_name, lockres->l_action); | |
1560 | ||
019d1b22 MF |
1561 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { |
1562 | lockres->l_action = OCFS2_AST_ATTACH; | |
bd3e7610 | 1563 | lkm_flags &= ~DLM_LKF_CONVERT; |
019d1b22 MF |
1564 | } else { |
1565 | lockres->l_action = OCFS2_AST_CONVERT; | |
bd3e7610 | 1566 | lkm_flags |= DLM_LKF_CONVERT; |
019d1b22 MF |
1567 | } |
1568 | ||
ccd979bd MF |
1569 | lockres->l_requested = level; |
1570 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
de551246 | 1571 | gen = lockres_set_pending(lockres); |
ccd979bd MF |
1572 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1573 | ||
bd3e7610 JB |
1574 | BUG_ON(level == DLM_LOCK_IV); |
1575 | BUG_ON(level == DLM_LOCK_NL); | |
ccd979bd | 1576 | |
9b915181 | 1577 | mlog(ML_BASTS, "lockres %s, convert from %d to %d\n", |
ccd979bd MF |
1578 | lockres->l_name, lockres->l_level, level); |
1579 | ||
1580 | /* call dlm_lock to upgrade lock now */ | |
4670c46d | 1581 | ret = ocfs2_dlm_lock(osb->cconn, |
7431cd7e JB |
1582 | level, |
1583 | &lockres->l_lksb, | |
1584 | lkm_flags, | |
1585 | lockres->l_name, | |
a796d286 | 1586 | OCFS2_LOCK_ID_MAX_LEN - 1); |
de551246 | 1587 | lockres_clear_pending(lockres, gen, osb); |
7431cd7e JB |
1588 | if (ret) { |
1589 | if (!(lkm_flags & DLM_LKF_NOQUEUE) || | |
1590 | (ret != -EAGAIN)) { | |
24ef1815 | 1591 | ocfs2_log_dlm_error("ocfs2_dlm_lock", |
7431cd7e | 1592 | ret, lockres); |
ccd979bd MF |
1593 | } |
1594 | ocfs2_recover_from_dlm_error(lockres, 1); | |
1595 | goto out; | |
1596 | } | |
d1e78238 | 1597 | dlm_locked = 1; |
ccd979bd | 1598 | |
73ac36ea | 1599 | mlog(0, "lock %s, successful return from ocfs2_dlm_lock\n", |
ccd979bd MF |
1600 | lockres->l_name); |
1601 | ||
1602 | /* At this point we've gone inside the dlm and need to | |
1603 | * complete our work regardless. */ | |
1604 | catch_signals = 0; | |
1605 | ||
1606 | /* wait for busy to clear and carry on */ | |
1607 | goto again; | |
1608 | } | |
1609 | ||
a1912826 | 1610 | update_holders: |
ccd979bd MF |
1611 | /* Ok, if we get here then we're good to go. */ |
1612 | ocfs2_inc_holders(lockres, level); | |
1613 | ||
1614 | ret = 0; | |
1615 | unlock: | |
a1912826 SM |
1616 | lockres_clear_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING); |
1617 | ||
b1b1e15e TS |
1618 | /* ocfs2_unblock_lock reques on seeing OCFS2_LOCK_UPCONVERT_FINISHING */ |
1619 | kick_dc = (lockres->l_flags & OCFS2_LOCK_BLOCKED); | |
1620 | ||
ccd979bd | 1621 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
b1b1e15e TS |
1622 | if (kick_dc) |
1623 | ocfs2_wake_downconvert_thread(osb); | |
ccd979bd MF |
1624 | out: |
1625 | /* | |
1626 | * This is helping work around a lock inversion between the page lock | |
1627 | * and dlm locks. One path holds the page lock while calling aops | |
1628 | * which block acquiring dlm locks. The voting thread holds dlm | |
1629 | * locks while acquiring page locks while down converting data locks. | |
1630 | * This block is helping an aop path notice the inversion and back | |
1631 | * off to unlock its page lock before trying the dlm lock again. | |
1632 | */ | |
1633 | if (wait && arg_flags & OCFS2_LOCK_NONBLOCK && | |
1634 | mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) { | |
1635 | wait = 0; | |
d1e78238 X |
1636 | spin_lock_irqsave(&lockres->l_lock, flags); |
1637 | if (__lockres_remove_mask_waiter(lockres, &mw)) { | |
1638 | if (dlm_locked) | |
1639 | lockres_or_flags(lockres, | |
1640 | OCFS2_LOCK_NONBLOCK_FINISHED); | |
1641 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
ccd979bd | 1642 | ret = -EAGAIN; |
d1e78238 X |
1643 | } else { |
1644 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
ccd979bd | 1645 | goto again; |
d1e78238 | 1646 | } |
ccd979bd MF |
1647 | } |
1648 | if (wait) { | |
1649 | ret = ocfs2_wait_for_mask(&mw); | |
1650 | if (ret == 0) | |
1651 | goto again; | |
1652 | mlog_errno(ret); | |
1653 | } | |
8ddb7b00 | 1654 | ocfs2_update_lock_stats(lockres, level, &mw, ret); |
ccd979bd | 1655 | |
cb25797d JK |
1656 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1657 | if (!ret && lockres->l_lockdep_map.key != NULL) { | |
1658 | if (level == DLM_LOCK_PR) | |
1659 | rwsem_acquire_read(&lockres->l_lockdep_map, l_subclass, | |
1660 | !!(arg_flags & OCFS2_META_LOCK_NOQUEUE), | |
1661 | caller_ip); | |
1662 | else | |
1663 | rwsem_acquire(&lockres->l_lockdep_map, l_subclass, | |
1664 | !!(arg_flags & OCFS2_META_LOCK_NOQUEUE), | |
1665 | caller_ip); | |
1666 | } | |
1667 | #endif | |
ccd979bd MF |
1668 | return ret; |
1669 | } | |
1670 | ||
cb25797d JK |
1671 | static inline int ocfs2_cluster_lock(struct ocfs2_super *osb, |
1672 | struct ocfs2_lock_res *lockres, | |
1673 | int level, | |
1674 | u32 lkm_flags, | |
1675 | int arg_flags) | |
1676 | { | |
1677 | return __ocfs2_cluster_lock(osb, lockres, level, lkm_flags, arg_flags, | |
1678 | 0, _RET_IP_); | |
1679 | } | |
1680 | ||
1681 | ||
1682 | static void __ocfs2_cluster_unlock(struct ocfs2_super *osb, | |
1683 | struct ocfs2_lock_res *lockres, | |
1684 | int level, | |
1685 | unsigned long caller_ip) | |
ccd979bd MF |
1686 | { |
1687 | unsigned long flags; | |
1688 | ||
ccd979bd MF |
1689 | spin_lock_irqsave(&lockres->l_lock, flags); |
1690 | ocfs2_dec_holders(lockres, level); | |
34d024f8 | 1691 | ocfs2_downconvert_on_unlock(osb, lockres); |
ccd979bd | 1692 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
cb25797d JK |
1693 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1694 | if (lockres->l_lockdep_map.key != NULL) | |
5facae4f | 1695 | rwsem_release(&lockres->l_lockdep_map, caller_ip); |
cb25797d | 1696 | #endif |
ccd979bd MF |
1697 | } |
1698 | ||
da66116e AB |
1699 | static int ocfs2_create_new_lock(struct ocfs2_super *osb, |
1700 | struct ocfs2_lock_res *lockres, | |
1701 | int ex, | |
1702 | int local) | |
ccd979bd | 1703 | { |
bd3e7610 | 1704 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd | 1705 | unsigned long flags; |
bd3e7610 | 1706 | u32 lkm_flags = local ? DLM_LKF_LOCAL : 0; |
ccd979bd MF |
1707 | |
1708 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1709 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); | |
1710 | lockres_or_flags(lockres, OCFS2_LOCK_LOCAL); | |
1711 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1712 | ||
24c19ef4 | 1713 | return ocfs2_lock_create(osb, lockres, level, lkm_flags); |
ccd979bd MF |
1714 | } |
1715 | ||
1716 | /* Grants us an EX lock on the data and metadata resources, skipping | |
1717 | * the normal cluster directory lookup. Use this ONLY on newly created | |
1718 | * inodes which other nodes can't possibly see, and which haven't been | |
1719 | * hashed in the inode hash yet. This can give us a good performance | |
1720 | * increase as it'll skip the network broadcast normally associated | |
1721 | * with creating a new lock resource. */ | |
1722 | int ocfs2_create_new_inode_locks(struct inode *inode) | |
1723 | { | |
1724 | int ret; | |
d680efe9 | 1725 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 1726 | |
ccd979bd MF |
1727 | BUG_ON(!ocfs2_inode_is_new(inode)); |
1728 | ||
b0697053 | 1729 | mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno); |
ccd979bd MF |
1730 | |
1731 | /* NOTE: That we don't increment any of the holder counts, nor | |
1732 | * do we add anything to a journal handle. Since this is | |
1733 | * supposed to be a new inode which the cluster doesn't know | |
1734 | * about yet, there is no need to. As far as the LVB handling | |
1735 | * is concerned, this is basically like acquiring an EX lock | |
1736 | * on a resource which has an invalid one -- we'll set it | |
1737 | * valid when we release the EX. */ | |
1738 | ||
24c19ef4 | 1739 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_rw_lockres, 1, 1); |
ccd979bd MF |
1740 | if (ret) { |
1741 | mlog_errno(ret); | |
1742 | goto bail; | |
1743 | } | |
1744 | ||
24c19ef4 | 1745 | /* |
bd3e7610 | 1746 | * We don't want to use DLM_LKF_LOCAL on a meta data lock as they |
24c19ef4 MF |
1747 | * don't use a generation in their lock names. |
1748 | */ | |
e63aecb6 | 1749 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_inode_lockres, 1, 0); |
ccd979bd MF |
1750 | if (ret) { |
1751 | mlog_errno(ret); | |
1752 | goto bail; | |
1753 | } | |
1754 | ||
50008630 | 1755 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_open_lockres, 0, 0); |
a8f24f1b | 1756 | if (ret) |
50008630 | 1757 | mlog_errno(ret); |
50008630 | 1758 | |
ccd979bd | 1759 | bail: |
ccd979bd MF |
1760 | return ret; |
1761 | } | |
1762 | ||
1763 | int ocfs2_rw_lock(struct inode *inode, int write) | |
1764 | { | |
1765 | int status, level; | |
1766 | struct ocfs2_lock_res *lockres; | |
c271c5c2 | 1767 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 1768 | |
b0697053 MF |
1769 | mlog(0, "inode %llu take %s RW lock\n", |
1770 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1771 | write ? "EXMODE" : "PRMODE"); |
1772 | ||
c1e8d35e | 1773 | if (ocfs2_mount_local(osb)) |
c271c5c2 SM |
1774 | return 0; |
1775 | ||
ccd979bd MF |
1776 | lockres = &OCFS2_I(inode)->ip_rw_lockres; |
1777 | ||
bd3e7610 | 1778 | level = write ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd | 1779 | |
1119d3c0 | 1780 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); |
ccd979bd MF |
1781 | if (status < 0) |
1782 | mlog_errno(status); | |
1783 | ||
ccd979bd MF |
1784 | return status; |
1785 | } | |
1786 | ||
06e7f13d GH |
1787 | int ocfs2_try_rw_lock(struct inode *inode, int write) |
1788 | { | |
1789 | int status, level; | |
1790 | struct ocfs2_lock_res *lockres; | |
1791 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1792 | ||
1793 | mlog(0, "inode %llu try to take %s RW lock\n", | |
1794 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
1795 | write ? "EXMODE" : "PRMODE"); | |
1796 | ||
1797 | if (ocfs2_mount_local(osb)) | |
1798 | return 0; | |
1799 | ||
1800 | lockres = &OCFS2_I(inode)->ip_rw_lockres; | |
1801 | ||
1802 | level = write ? DLM_LOCK_EX : DLM_LOCK_PR; | |
1803 | ||
1804 | status = ocfs2_cluster_lock(osb, lockres, level, DLM_LKF_NOQUEUE, 0); | |
1805 | return status; | |
1806 | } | |
1807 | ||
ccd979bd MF |
1808 | void ocfs2_rw_unlock(struct inode *inode, int write) |
1809 | { | |
bd3e7610 | 1810 | int level = write ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd | 1811 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres; |
c271c5c2 | 1812 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 1813 | |
b0697053 MF |
1814 | mlog(0, "inode %llu drop %s RW lock\n", |
1815 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1816 | write ? "EXMODE" : "PRMODE"); |
1817 | ||
c271c5c2 | 1818 | if (!ocfs2_mount_local(osb)) |
1119d3c0 | 1819 | ocfs2_cluster_unlock(osb, lockres, level); |
ccd979bd MF |
1820 | } |
1821 | ||
50008630 TY |
1822 | /* |
1823 | * ocfs2_open_lock always get PR mode lock. | |
1824 | */ | |
1825 | int ocfs2_open_lock(struct inode *inode) | |
1826 | { | |
1827 | int status = 0; | |
1828 | struct ocfs2_lock_res *lockres; | |
1829 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1830 | ||
50008630 TY |
1831 | mlog(0, "inode %llu take PRMODE open lock\n", |
1832 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
1833 | ||
03efed8a | 1834 | if (ocfs2_is_hard_readonly(osb) || ocfs2_mount_local(osb)) |
50008630 TY |
1835 | goto out; |
1836 | ||
1837 | lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1838 | ||
1119d3c0 | 1839 | status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_PR, 0, 0); |
50008630 TY |
1840 | if (status < 0) |
1841 | mlog_errno(status); | |
1842 | ||
1843 | out: | |
50008630 TY |
1844 | return status; |
1845 | } | |
1846 | ||
1847 | int ocfs2_try_open_lock(struct inode *inode, int write) | |
1848 | { | |
1849 | int status = 0, level; | |
1850 | struct ocfs2_lock_res *lockres; | |
1851 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1852 | ||
50008630 TY |
1853 | mlog(0, "inode %llu try to take %s open lock\n", |
1854 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
1855 | write ? "EXMODE" : "PRMODE"); | |
1856 | ||
03efed8a TY |
1857 | if (ocfs2_is_hard_readonly(osb)) { |
1858 | if (write) | |
1859 | status = -EROFS; | |
1860 | goto out; | |
1861 | } | |
1862 | ||
50008630 TY |
1863 | if (ocfs2_mount_local(osb)) |
1864 | goto out; | |
1865 | ||
1866 | lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1867 | ||
bd3e7610 | 1868 | level = write ? DLM_LOCK_EX : DLM_LOCK_PR; |
50008630 TY |
1869 | |
1870 | /* | |
1871 | * The file system may already holding a PRMODE/EXMODE open lock. | |
bd3e7610 | 1872 | * Since we pass DLM_LKF_NOQUEUE, the request won't block waiting on |
50008630 TY |
1873 | * other nodes and the -EAGAIN will indicate to the caller that |
1874 | * this inode is still in use. | |
1875 | */ | |
1119d3c0 | 1876 | status = ocfs2_cluster_lock(osb, lockres, level, DLM_LKF_NOQUEUE, 0); |
50008630 TY |
1877 | |
1878 | out: | |
50008630 TY |
1879 | return status; |
1880 | } | |
1881 | ||
1882 | /* | |
1883 | * ocfs2_open_unlock unlock PR and EX mode open locks. | |
1884 | */ | |
1885 | void ocfs2_open_unlock(struct inode *inode) | |
1886 | { | |
1887 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1888 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1889 | ||
50008630 TY |
1890 | mlog(0, "inode %llu drop open lock\n", |
1891 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
1892 | ||
1893 | if (ocfs2_mount_local(osb)) | |
1894 | goto out; | |
1895 | ||
1896 | if(lockres->l_ro_holders) | |
1119d3c0 | 1897 | ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_PR); |
50008630 | 1898 | if(lockres->l_ex_holders) |
1119d3c0 | 1899 | ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX); |
50008630 TY |
1900 | |
1901 | out: | |
c1e8d35e | 1902 | return; |
50008630 TY |
1903 | } |
1904 | ||
cf8e06f1 MF |
1905 | static int ocfs2_flock_handle_signal(struct ocfs2_lock_res *lockres, |
1906 | int level) | |
1907 | { | |
1908 | int ret; | |
1909 | struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); | |
1910 | unsigned long flags; | |
1911 | struct ocfs2_mask_waiter mw; | |
1912 | ||
1913 | ocfs2_init_mask_waiter(&mw); | |
1914 | ||
1915 | retry_cancel: | |
1916 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1917 | if (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
1918 | ret = ocfs2_prepare_cancel_convert(osb, lockres); | |
1919 | if (ret) { | |
1920 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1921 | ret = ocfs2_cancel_convert(osb, lockres); | |
1922 | if (ret < 0) { | |
1923 | mlog_errno(ret); | |
1924 | goto out; | |
1925 | } | |
1926 | goto retry_cancel; | |
1927 | } | |
1928 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
1929 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1930 | ||
1931 | ocfs2_wait_for_mask(&mw); | |
1932 | goto retry_cancel; | |
1933 | } | |
1934 | ||
1935 | ret = -ERESTARTSYS; | |
1936 | /* | |
1937 | * We may still have gotten the lock, in which case there's no | |
1938 | * point to restarting the syscall. | |
1939 | */ | |
1940 | if (lockres->l_level == level) | |
1941 | ret = 0; | |
1942 | ||
1943 | mlog(0, "Cancel returning %d. flags: 0x%lx, level: %d, act: %d\n", ret, | |
1944 | lockres->l_flags, lockres->l_level, lockres->l_action); | |
1945 | ||
1946 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1947 | ||
1948 | out: | |
1949 | return ret; | |
1950 | } | |
1951 | ||
1952 | /* | |
1953 | * ocfs2_file_lock() and ocfs2_file_unlock() map to a single pair of | |
1954 | * flock() calls. The locking approach this requires is sufficiently | |
1955 | * different from all other cluster lock types that we implement a | |
3ad2f3fb | 1956 | * separate path to the "low-level" dlm calls. In particular: |
cf8e06f1 MF |
1957 | * |
1958 | * - No optimization of lock levels is done - we take at exactly | |
1959 | * what's been requested. | |
1960 | * | |
1961 | * - No lock caching is employed. We immediately downconvert to | |
1962 | * no-lock at unlock time. This also means flock locks never go on | |
1963 | * the blocking list). | |
1964 | * | |
1965 | * - Since userspace can trivially deadlock itself with flock, we make | |
1966 | * sure to allow cancellation of a misbehaving applications flock() | |
1967 | * request. | |
1968 | * | |
1969 | * - Access to any flock lockres doesn't require concurrency, so we | |
1970 | * can simplify the code by requiring the caller to guarantee | |
1971 | * serialization of dlmglue flock calls. | |
1972 | */ | |
1973 | int ocfs2_file_lock(struct file *file, int ex, int trylock) | |
1974 | { | |
e988cf1c MF |
1975 | int ret, level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
1976 | unsigned int lkm_flags = trylock ? DLM_LKF_NOQUEUE : 0; | |
cf8e06f1 MF |
1977 | unsigned long flags; |
1978 | struct ocfs2_file_private *fp = file->private_data; | |
1979 | struct ocfs2_lock_res *lockres = &fp->fp_flock; | |
1980 | struct ocfs2_super *osb = OCFS2_SB(file->f_mapping->host->i_sb); | |
1981 | struct ocfs2_mask_waiter mw; | |
1982 | ||
1983 | ocfs2_init_mask_waiter(&mw); | |
1984 | ||
1985 | if ((lockres->l_flags & OCFS2_LOCK_BUSY) || | |
bd3e7610 | 1986 | (lockres->l_level > DLM_LOCK_NL)) { |
cf8e06f1 MF |
1987 | mlog(ML_ERROR, |
1988 | "File lock \"%s\" has busy or locked state: flags: 0x%lx, " | |
1989 | "level: %u\n", lockres->l_name, lockres->l_flags, | |
1990 | lockres->l_level); | |
1991 | return -EINVAL; | |
1992 | } | |
1993 | ||
1994 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1995 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { | |
1996 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
1997 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1998 | ||
1999 | /* | |
2000 | * Get the lock at NLMODE to start - that way we | |
2001 | * can cancel the upconvert request if need be. | |
2002 | */ | |
e988cf1c | 2003 | ret = ocfs2_lock_create(osb, lockres, DLM_LOCK_NL, 0); |
cf8e06f1 MF |
2004 | if (ret < 0) { |
2005 | mlog_errno(ret); | |
2006 | goto out; | |
2007 | } | |
2008 | ||
2009 | ret = ocfs2_wait_for_mask(&mw); | |
2010 | if (ret) { | |
2011 | mlog_errno(ret); | |
2012 | goto out; | |
2013 | } | |
2014 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2015 | } | |
2016 | ||
2017 | lockres->l_action = OCFS2_AST_CONVERT; | |
e988cf1c | 2018 | lkm_flags |= DLM_LKF_CONVERT; |
cf8e06f1 MF |
2019 | lockres->l_requested = level; |
2020 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
2021 | ||
2022 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
2023 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2024 | ||
4670c46d | 2025 | ret = ocfs2_dlm_lock(osb->cconn, level, &lockres->l_lksb, lkm_flags, |
a796d286 | 2026 | lockres->l_name, OCFS2_LOCK_ID_MAX_LEN - 1); |
7431cd7e JB |
2027 | if (ret) { |
2028 | if (!trylock || (ret != -EAGAIN)) { | |
24ef1815 | 2029 | ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres); |
cf8e06f1 MF |
2030 | ret = -EINVAL; |
2031 | } | |
2032 | ||
2033 | ocfs2_recover_from_dlm_error(lockres, 1); | |
2034 | lockres_remove_mask_waiter(lockres, &mw); | |
2035 | goto out; | |
2036 | } | |
2037 | ||
2038 | ret = ocfs2_wait_for_mask_interruptible(&mw, lockres); | |
2039 | if (ret == -ERESTARTSYS) { | |
2040 | /* | |
2041 | * Userspace can cause deadlock itself with | |
2042 | * flock(). Current behavior locally is to allow the | |
2043 | * deadlock, but abort the system call if a signal is | |
2044 | * received. We follow this example, otherwise a | |
2045 | * poorly written program could sit in kernel until | |
2046 | * reboot. | |
2047 | * | |
2048 | * Handling this is a bit more complicated for Ocfs2 | |
2049 | * though. We can't exit this function with an | |
2050 | * outstanding lock request, so a cancel convert is | |
2051 | * required. We intentionally overwrite 'ret' - if the | |
2052 | * cancel fails and the lock was granted, it's easier | |
af901ca1 | 2053 | * to just bubble success back up to the user. |
cf8e06f1 MF |
2054 | */ |
2055 | ret = ocfs2_flock_handle_signal(lockres, level); | |
1693a5c0 DT |
2056 | } else if (!ret && (level > lockres->l_level)) { |
2057 | /* Trylock failed asynchronously */ | |
2058 | BUG_ON(!trylock); | |
2059 | ret = -EAGAIN; | |
cf8e06f1 MF |
2060 | } |
2061 | ||
2062 | out: | |
2063 | ||
2064 | mlog(0, "Lock: \"%s\" ex: %d, trylock: %d, returns: %d\n", | |
2065 | lockres->l_name, ex, trylock, ret); | |
2066 | return ret; | |
2067 | } | |
2068 | ||
2069 | void ocfs2_file_unlock(struct file *file) | |
2070 | { | |
2071 | int ret; | |
de551246 | 2072 | unsigned int gen; |
cf8e06f1 MF |
2073 | unsigned long flags; |
2074 | struct ocfs2_file_private *fp = file->private_data; | |
2075 | struct ocfs2_lock_res *lockres = &fp->fp_flock; | |
2076 | struct ocfs2_super *osb = OCFS2_SB(file->f_mapping->host->i_sb); | |
2077 | struct ocfs2_mask_waiter mw; | |
2078 | ||
2079 | ocfs2_init_mask_waiter(&mw); | |
2080 | ||
2081 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) | |
2082 | return; | |
2083 | ||
e988cf1c | 2084 | if (lockres->l_level == DLM_LOCK_NL) |
cf8e06f1 MF |
2085 | return; |
2086 | ||
2087 | mlog(0, "Unlock: \"%s\" flags: 0x%lx, level: %d, act: %d\n", | |
2088 | lockres->l_name, lockres->l_flags, lockres->l_level, | |
2089 | lockres->l_action); | |
2090 | ||
2091 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2092 | /* | |
2093 | * Fake a blocking ast for the downconvert code. | |
2094 | */ | |
2095 | lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); | |
bd3e7610 | 2096 | lockres->l_blocking = DLM_LOCK_EX; |
cf8e06f1 | 2097 | |
e988cf1c | 2098 | gen = ocfs2_prepare_downconvert(lockres, DLM_LOCK_NL); |
cf8e06f1 MF |
2099 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); |
2100 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2101 | ||
e988cf1c | 2102 | ret = ocfs2_downconvert_lock(osb, lockres, DLM_LOCK_NL, 0, gen); |
cf8e06f1 MF |
2103 | if (ret) { |
2104 | mlog_errno(ret); | |
2105 | return; | |
2106 | } | |
2107 | ||
2108 | ret = ocfs2_wait_for_mask(&mw); | |
2109 | if (ret) | |
2110 | mlog_errno(ret); | |
2111 | } | |
2112 | ||
34d024f8 MF |
2113 | static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb, |
2114 | struct ocfs2_lock_res *lockres) | |
ccd979bd MF |
2115 | { |
2116 | int kick = 0; | |
2117 | ||
ccd979bd | 2118 | /* If we know that another node is waiting on our lock, kick |
34d024f8 | 2119 | * the downconvert thread * pre-emptively when we reach a release |
ccd979bd MF |
2120 | * condition. */ |
2121 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) { | |
2122 | switch(lockres->l_blocking) { | |
bd3e7610 | 2123 | case DLM_LOCK_EX: |
ccd979bd MF |
2124 | if (!lockres->l_ex_holders && !lockres->l_ro_holders) |
2125 | kick = 1; | |
2126 | break; | |
bd3e7610 | 2127 | case DLM_LOCK_PR: |
ccd979bd MF |
2128 | if (!lockres->l_ex_holders) |
2129 | kick = 1; | |
2130 | break; | |
2131 | default: | |
2132 | BUG(); | |
2133 | } | |
2134 | } | |
2135 | ||
2136 | if (kick) | |
34d024f8 | 2137 | ocfs2_wake_downconvert_thread(osb); |
ccd979bd MF |
2138 | } |
2139 | ||
ccd979bd | 2140 | #define OCFS2_SEC_BITS 34 |
31cc0c80 | 2141 | #define OCFS2_SEC_SHIFT (64 - OCFS2_SEC_BITS) |
ccd979bd MF |
2142 | #define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1) |
2143 | ||
2144 | /* LVB only has room for 64 bits of time here so we pack it for | |
2145 | * now. */ | |
3a3d1e51 | 2146 | static u64 ocfs2_pack_timespec(struct timespec64 *spec) |
ccd979bd MF |
2147 | { |
2148 | u64 res; | |
3a3d1e51 | 2149 | u64 sec = clamp_t(time64_t, spec->tv_sec, 0, 0x3ffffffffull); |
ccd979bd MF |
2150 | u32 nsec = spec->tv_nsec; |
2151 | ||
2152 | res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK); | |
2153 | ||
2154 | return res; | |
2155 | } | |
2156 | ||
2157 | /* Call this with the lockres locked. I am reasonably sure we don't | |
2158 | * need ip_lock in this function as anyone who would be changing those | |
e63aecb6 | 2159 | * values is supposed to be blocked in ocfs2_inode_lock right now. */ |
ccd979bd MF |
2160 | static void __ocfs2_stuff_meta_lvb(struct inode *inode) |
2161 | { | |
2162 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
e63aecb6 | 2163 | struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
ccd979bd | 2164 | struct ocfs2_meta_lvb *lvb; |
fd6acbbc | 2165 | struct timespec64 ts; |
ccd979bd | 2166 | |
a641dc2a | 2167 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
ccd979bd | 2168 | |
24c19ef4 MF |
2169 | /* |
2170 | * Invalidate the LVB of a deleted inode - this way other | |
2171 | * nodes are forced to go to disk and discover the new inode | |
2172 | * status. | |
2173 | */ | |
2174 | if (oi->ip_flags & OCFS2_INODE_DELETED) { | |
2175 | lvb->lvb_version = 0; | |
2176 | goto out; | |
2177 | } | |
2178 | ||
4d3b83f7 | 2179 | lvb->lvb_version = OCFS2_LVB_VERSION; |
ccd979bd MF |
2180 | lvb->lvb_isize = cpu_to_be64(i_size_read(inode)); |
2181 | lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters); | |
03ab30f7 EB |
2182 | lvb->lvb_iuid = cpu_to_be32(i_uid_read(inode)); |
2183 | lvb->lvb_igid = cpu_to_be32(i_gid_read(inode)); | |
ccd979bd MF |
2184 | lvb->lvb_imode = cpu_to_be16(inode->i_mode); |
2185 | lvb->lvb_inlink = cpu_to_be16(inode->i_nlink); | |
fd6acbbc JL |
2186 | ts = inode_get_atime(inode); |
2187 | lvb->lvb_iatime_packed = cpu_to_be64(ocfs2_pack_timespec(&ts)); | |
2188 | ts = inode_get_ctime(inode); | |
2189 | lvb->lvb_ictime_packed = cpu_to_be64(ocfs2_pack_timespec(&ts)); | |
2190 | ts = inode_get_mtime(inode); | |
2191 | lvb->lvb_imtime_packed = cpu_to_be64(ocfs2_pack_timespec(&ts)); | |
ca4d147e | 2192 | lvb->lvb_iattr = cpu_to_be32(oi->ip_attr); |
15b1e36b | 2193 | lvb->lvb_idynfeatures = cpu_to_be16(oi->ip_dyn_features); |
f9e2d82e | 2194 | lvb->lvb_igeneration = cpu_to_be32(inode->i_generation); |
ccd979bd | 2195 | |
24c19ef4 | 2196 | out: |
ccd979bd | 2197 | mlog_meta_lvb(0, lockres); |
ccd979bd MF |
2198 | } |
2199 | ||
3a3d1e51 | 2200 | static void ocfs2_unpack_timespec(struct timespec64 *spec, |
ccd979bd MF |
2201 | u64 packed_time) |
2202 | { | |
2203 | spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT; | |
2204 | spec->tv_nsec = packed_time & OCFS2_NSEC_MASK; | |
2205 | } | |
2206 | ||
60606eca | 2207 | static int ocfs2_refresh_inode_from_lvb(struct inode *inode) |
ccd979bd MF |
2208 | { |
2209 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
e63aecb6 | 2210 | struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
ccd979bd | 2211 | struct ocfs2_meta_lvb *lvb; |
fd6acbbc | 2212 | struct timespec64 ts; |
ccd979bd | 2213 | |
ccd979bd MF |
2214 | mlog_meta_lvb(0, lockres); |
2215 | ||
a641dc2a | 2216 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
60606eca AV |
2217 | if (inode_wrong_type(inode, be16_to_cpu(lvb->lvb_imode))) |
2218 | return -ESTALE; | |
ccd979bd MF |
2219 | |
2220 | /* We're safe here without the lockres lock... */ | |
2221 | spin_lock(&oi->ip_lock); | |
2222 | oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters); | |
2223 | i_size_write(inode, be64_to_cpu(lvb->lvb_isize)); | |
2224 | ||
ca4d147e | 2225 | oi->ip_attr = be32_to_cpu(lvb->lvb_iattr); |
15b1e36b | 2226 | oi->ip_dyn_features = be16_to_cpu(lvb->lvb_idynfeatures); |
ca4d147e HP |
2227 | ocfs2_set_inode_flags(inode); |
2228 | ||
ccd979bd MF |
2229 | /* fast-symlinks are a special case */ |
2230 | if (S_ISLNK(inode->i_mode) && !oi->ip_clusters) | |
2231 | inode->i_blocks = 0; | |
2232 | else | |
8110b073 | 2233 | inode->i_blocks = ocfs2_inode_sector_count(inode); |
ccd979bd | 2234 | |
03ab30f7 EB |
2235 | i_uid_write(inode, be32_to_cpu(lvb->lvb_iuid)); |
2236 | i_gid_write(inode, be32_to_cpu(lvb->lvb_igid)); | |
ccd979bd | 2237 | inode->i_mode = be16_to_cpu(lvb->lvb_imode); |
bfe86848 | 2238 | set_nlink(inode, be16_to_cpu(lvb->lvb_inlink)); |
fd6acbbc JL |
2239 | ocfs2_unpack_timespec(&ts, be64_to_cpu(lvb->lvb_iatime_packed)); |
2240 | inode_set_atime_to_ts(inode, ts); | |
2241 | ocfs2_unpack_timespec(&ts, be64_to_cpu(lvb->lvb_imtime_packed)); | |
2242 | inode_set_mtime_to_ts(inode, ts); | |
2243 | ocfs2_unpack_timespec(&ts, be64_to_cpu(lvb->lvb_ictime_packed)); | |
2244 | inode_set_ctime_to_ts(inode, ts); | |
ccd979bd | 2245 | spin_unlock(&oi->ip_lock); |
60606eca | 2246 | return 0; |
ccd979bd MF |
2247 | } |
2248 | ||
f9e2d82e MF |
2249 | static inline int ocfs2_meta_lvb_is_trustable(struct inode *inode, |
2250 | struct ocfs2_lock_res *lockres) | |
ccd979bd | 2251 | { |
a641dc2a | 2252 | struct ocfs2_meta_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
ccd979bd | 2253 | |
1c520dfb JB |
2254 | if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) |
2255 | && lvb->lvb_version == OCFS2_LVB_VERSION | |
f9e2d82e | 2256 | && be32_to_cpu(lvb->lvb_igeneration) == inode->i_generation) |
ccd979bd MF |
2257 | return 1; |
2258 | return 0; | |
2259 | } | |
2260 | ||
2261 | /* Determine whether a lock resource needs to be refreshed, and | |
2262 | * arbitrate who gets to refresh it. | |
2263 | * | |
2264 | * 0 means no refresh needed. | |
2265 | * | |
2266 | * > 0 means you need to refresh this and you MUST call | |
2267 | * ocfs2_complete_lock_res_refresh afterwards. */ | |
2268 | static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres) | |
2269 | { | |
2270 | unsigned long flags; | |
2271 | int status = 0; | |
2272 | ||
ccd979bd MF |
2273 | refresh_check: |
2274 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2275 | if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) { | |
2276 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2277 | goto bail; | |
2278 | } | |
2279 | ||
2280 | if (lockres->l_flags & OCFS2_LOCK_REFRESHING) { | |
2281 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2282 | ||
2283 | ocfs2_wait_on_refreshing_lock(lockres); | |
2284 | goto refresh_check; | |
2285 | } | |
2286 | ||
2287 | /* Ok, I'll be the one to refresh this lock. */ | |
2288 | lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING); | |
2289 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2290 | ||
2291 | status = 1; | |
2292 | bail: | |
c1e8d35e | 2293 | mlog(0, "status %d\n", status); |
ccd979bd MF |
2294 | return status; |
2295 | } | |
2296 | ||
2297 | /* If status is non zero, I'll mark it as not being in refresh | |
2298 | * anymroe, but i won't clear the needs refresh flag. */ | |
2299 | static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres, | |
2300 | int status) | |
2301 | { | |
2302 | unsigned long flags; | |
ccd979bd MF |
2303 | |
2304 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2305 | lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING); | |
2306 | if (!status) | |
2307 | lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); | |
2308 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2309 | ||
2310 | wake_up(&lockres->l_event); | |
ccd979bd MF |
2311 | } |
2312 | ||
2313 | /* may or may not return a bh if it went to disk. */ | |
e63aecb6 | 2314 | static int ocfs2_inode_lock_update(struct inode *inode, |
ccd979bd MF |
2315 | struct buffer_head **bh) |
2316 | { | |
2317 | int status = 0; | |
2318 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
e63aecb6 | 2319 | struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
ccd979bd | 2320 | struct ocfs2_dinode *fe; |
c271c5c2 | 2321 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 2322 | |
be9e986b MF |
2323 | if (ocfs2_mount_local(osb)) |
2324 | goto bail; | |
2325 | ||
ccd979bd MF |
2326 | spin_lock(&oi->ip_lock); |
2327 | if (oi->ip_flags & OCFS2_INODE_DELETED) { | |
b0697053 | 2328 | mlog(0, "Orphaned inode %llu was deleted while we " |
ccd979bd | 2329 | "were waiting on a lock. ip_flags = 0x%x\n", |
b0697053 | 2330 | (unsigned long long)oi->ip_blkno, oi->ip_flags); |
ccd979bd MF |
2331 | spin_unlock(&oi->ip_lock); |
2332 | status = -ENOENT; | |
2333 | goto bail; | |
2334 | } | |
2335 | spin_unlock(&oi->ip_lock); | |
2336 | ||
be9e986b MF |
2337 | if (!ocfs2_should_refresh_lock_res(lockres)) |
2338 | goto bail; | |
ccd979bd MF |
2339 | |
2340 | /* This will discard any caching information we might have had | |
2341 | * for the inode metadata. */ | |
8cb471e8 | 2342 | ocfs2_metadata_cache_purge(INODE_CACHE(inode)); |
ccd979bd | 2343 | |
83418978 MF |
2344 | ocfs2_extent_map_trunc(inode, 0); |
2345 | ||
be9e986b | 2346 | if (ocfs2_meta_lvb_is_trustable(inode, lockres)) { |
b0697053 MF |
2347 | mlog(0, "Trusting LVB on inode %llu\n", |
2348 | (unsigned long long)oi->ip_blkno); | |
60606eca AV |
2349 | status = ocfs2_refresh_inode_from_lvb(inode); |
2350 | goto bail_refresh; | |
ccd979bd MF |
2351 | } else { |
2352 | /* Boo, we have to go to disk. */ | |
2353 | /* read bh, cast, ocfs2_refresh_inode */ | |
b657c95c | 2354 | status = ocfs2_read_inode_block(inode, bh); |
ccd979bd MF |
2355 | if (status < 0) { |
2356 | mlog_errno(status); | |
2357 | goto bail_refresh; | |
2358 | } | |
2359 | fe = (struct ocfs2_dinode *) (*bh)->b_data; | |
60606eca AV |
2360 | if (inode_wrong_type(inode, le16_to_cpu(fe->i_mode))) { |
2361 | status = -ESTALE; | |
2362 | goto bail_refresh; | |
2363 | } | |
ccd979bd MF |
2364 | |
2365 | /* This is a good chance to make sure we're not | |
b657c95c JB |
2366 | * locking an invalid object. ocfs2_read_inode_block() |
2367 | * already checked that the inode block is sane. | |
ccd979bd MF |
2368 | * |
2369 | * We bug on a stale inode here because we checked | |
2370 | * above whether it was wiped from disk. The wiping | |
2371 | * node provides a guarantee that we receive that | |
2372 | * message and can mark the inode before dropping any | |
2373 | * locks associated with it. */ | |
ccd979bd MF |
2374 | mlog_bug_on_msg(inode->i_generation != |
2375 | le32_to_cpu(fe->i_generation), | |
b0697053 | 2376 | "Invalid dinode %llu disk generation: %u " |
ccd979bd | 2377 | "inode->i_generation: %u\n", |
b0697053 MF |
2378 | (unsigned long long)oi->ip_blkno, |
2379 | le32_to_cpu(fe->i_generation), | |
ccd979bd MF |
2380 | inode->i_generation); |
2381 | mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) || | |
2382 | !(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)), | |
b0697053 MF |
2383 | "Stale dinode %llu dtime: %llu flags: 0x%x\n", |
2384 | (unsigned long long)oi->ip_blkno, | |
2385 | (unsigned long long)le64_to_cpu(fe->i_dtime), | |
ccd979bd MF |
2386 | le32_to_cpu(fe->i_flags)); |
2387 | ||
2388 | ocfs2_refresh_inode(inode, fe); | |
8ddb7b00 | 2389 | ocfs2_track_lock_refresh(lockres); |
ccd979bd MF |
2390 | } |
2391 | ||
2392 | status = 0; | |
2393 | bail_refresh: | |
be9e986b | 2394 | ocfs2_complete_lock_res_refresh(lockres, status); |
ccd979bd | 2395 | bail: |
ccd979bd MF |
2396 | return status; |
2397 | } | |
2398 | ||
2399 | static int ocfs2_assign_bh(struct inode *inode, | |
2400 | struct buffer_head **ret_bh, | |
2401 | struct buffer_head *passed_bh) | |
2402 | { | |
2403 | int status; | |
2404 | ||
2405 | if (passed_bh) { | |
2406 | /* Ok, the update went to disk for us, use the | |
2407 | * returned bh. */ | |
2408 | *ret_bh = passed_bh; | |
2409 | get_bh(*ret_bh); | |
2410 | ||
2411 | return 0; | |
2412 | } | |
2413 | ||
b657c95c | 2414 | status = ocfs2_read_inode_block(inode, ret_bh); |
ccd979bd MF |
2415 | if (status < 0) |
2416 | mlog_errno(status); | |
2417 | ||
2418 | return status; | |
2419 | } | |
2420 | ||
2421 | /* | |
2422 | * returns < 0 error if the callback will never be called, otherwise | |
2423 | * the result of the lock will be communicated via the callback. | |
2424 | */ | |
cb25797d JK |
2425 | int ocfs2_inode_lock_full_nested(struct inode *inode, |
2426 | struct buffer_head **ret_bh, | |
2427 | int ex, | |
2428 | int arg_flags, | |
2429 | int subclass) | |
ccd979bd | 2430 | { |
bd3e7610 JB |
2431 | int status, level, acquired; |
2432 | u32 dlm_flags; | |
c271c5c2 | 2433 | struct ocfs2_lock_res *lockres = NULL; |
ccd979bd MF |
2434 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
2435 | struct buffer_head *local_bh = NULL; | |
2436 | ||
b0697053 MF |
2437 | mlog(0, "inode %llu, take %s META lock\n", |
2438 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
2439 | ex ? "EXMODE" : "PRMODE"); |
2440 | ||
2441 | status = 0; | |
2442 | acquired = 0; | |
2443 | /* We'll allow faking a readonly metadata lock for | |
2444 | * rodevices. */ | |
2445 | if (ocfs2_is_hard_readonly(osb)) { | |
2446 | if (ex) | |
2447 | status = -EROFS; | |
03efed8a | 2448 | goto getbh; |
ccd979bd MF |
2449 | } |
2450 | ||
439a36b8 ER |
2451 | if ((arg_flags & OCFS2_META_LOCK_GETBH) || |
2452 | ocfs2_mount_local(osb)) | |
2453 | goto update; | |
c271c5c2 | 2454 | |
ccd979bd | 2455 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) |
553abd04 | 2456 | ocfs2_wait_for_recovery(osb); |
ccd979bd | 2457 | |
e63aecb6 | 2458 | lockres = &OCFS2_I(inode)->ip_inode_lockres; |
bd3e7610 | 2459 | level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd MF |
2460 | dlm_flags = 0; |
2461 | if (arg_flags & OCFS2_META_LOCK_NOQUEUE) | |
bd3e7610 | 2462 | dlm_flags |= DLM_LKF_NOQUEUE; |
ccd979bd | 2463 | |
cb25797d JK |
2464 | status = __ocfs2_cluster_lock(osb, lockres, level, dlm_flags, |
2465 | arg_flags, subclass, _RET_IP_); | |
ccd979bd | 2466 | if (status < 0) { |
41003a7b | 2467 | if (status != -EAGAIN) |
ccd979bd MF |
2468 | mlog_errno(status); |
2469 | goto bail; | |
2470 | } | |
2471 | ||
2472 | /* Notify the error cleanup path to drop the cluster lock. */ | |
2473 | acquired = 1; | |
2474 | ||
2475 | /* We wait twice because a node may have died while we were in | |
2476 | * the lower dlm layers. The second time though, we've | |
2477 | * committed to owning this lock so we don't allow signals to | |
2478 | * abort the operation. */ | |
2479 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) | |
553abd04 | 2480 | ocfs2_wait_for_recovery(osb); |
ccd979bd | 2481 | |
439a36b8 | 2482 | update: |
24c19ef4 MF |
2483 | /* |
2484 | * We only see this flag if we're being called from | |
2485 | * ocfs2_read_locked_inode(). It means we're locking an inode | |
2486 | * which hasn't been populated yet, so clear the refresh flag | |
2487 | * and let the caller handle it. | |
2488 | */ | |
2489 | if (inode->i_state & I_NEW) { | |
2490 | status = 0; | |
c271c5c2 SM |
2491 | if (lockres) |
2492 | ocfs2_complete_lock_res_refresh(lockres, 0); | |
24c19ef4 MF |
2493 | goto bail; |
2494 | } | |
2495 | ||
ccd979bd | 2496 | /* This is fun. The caller may want a bh back, or it may |
e63aecb6 | 2497 | * not. ocfs2_inode_lock_update definitely wants one in, but |
ccd979bd MF |
2498 | * may or may not read one, depending on what's in the |
2499 | * LVB. The result of all of this is that we've *only* gone to | |
2500 | * disk if we have to, so the complexity is worthwhile. */ | |
e63aecb6 | 2501 | status = ocfs2_inode_lock_update(inode, &local_bh); |
ccd979bd MF |
2502 | if (status < 0) { |
2503 | if (status != -ENOENT) | |
2504 | mlog_errno(status); | |
2505 | goto bail; | |
2506 | } | |
03efed8a | 2507 | getbh: |
ccd979bd MF |
2508 | if (ret_bh) { |
2509 | status = ocfs2_assign_bh(inode, ret_bh, local_bh); | |
2510 | if (status < 0) { | |
2511 | mlog_errno(status); | |
2512 | goto bail; | |
2513 | } | |
2514 | } | |
2515 | ||
ccd979bd MF |
2516 | bail: |
2517 | if (status < 0) { | |
2518 | if (ret_bh && (*ret_bh)) { | |
2519 | brelse(*ret_bh); | |
2520 | *ret_bh = NULL; | |
2521 | } | |
2522 | if (acquired) | |
e63aecb6 | 2523 | ocfs2_inode_unlock(inode, ex); |
ccd979bd MF |
2524 | } |
2525 | ||
a89bd89f | 2526 | brelse(local_bh); |
ccd979bd MF |
2527 | return status; |
2528 | } | |
2529 | ||
2530 | /* | |
34d024f8 MF |
2531 | * This is working around a lock inversion between tasks acquiring DLM |
2532 | * locks while holding a page lock and the downconvert thread which | |
2533 | * blocks dlm lock acquiry while acquiring page locks. | |
ccd979bd MF |
2534 | * |
2535 | * ** These _with_page variantes are only intended to be called from aop | |
2536 | * methods that hold page locks and return a very specific *positive* error | |
2537 | * code that aop methods pass up to the VFS -- test for errors with != 0. ** | |
2538 | * | |
34d024f8 MF |
2539 | * The DLM is called such that it returns -EAGAIN if it would have |
2540 | * blocked waiting for the downconvert thread. In that case we unlock | |
2541 | * our page so the downconvert thread can make progress. Once we've | |
2542 | * done this we have to return AOP_TRUNCATED_PAGE so the aop method | |
2543 | * that called us can bubble that back up into the VFS who will then | |
2544 | * immediately retry the aop call. | |
ccd979bd | 2545 | */ |
e63aecb6 | 2546 | int ocfs2_inode_lock_with_page(struct inode *inode, |
ccd979bd MF |
2547 | struct buffer_head **ret_bh, |
2548 | int ex, | |
2549 | struct page *page) | |
2550 | { | |
2551 | int ret; | |
2552 | ||
e63aecb6 | 2553 | ret = ocfs2_inode_lock_full(inode, ret_bh, ex, OCFS2_LOCK_NONBLOCK); |
ccd979bd MF |
2554 | if (ret == -EAGAIN) { |
2555 | unlock_page(page); | |
ff26cc10 GH |
2556 | /* |
2557 | * If we can't get inode lock immediately, we should not return | |
2558 | * directly here, since this will lead to a softlockup problem. | |
2559 | * The method is to get a blocking lock and immediately unlock | |
2560 | * before returning, this can avoid CPU resource waste due to | |
2561 | * lots of retries, and benefits fairness in getting lock. | |
2562 | */ | |
2563 | if (ocfs2_inode_lock(inode, ret_bh, ex) == 0) | |
2564 | ocfs2_inode_unlock(inode, ex); | |
ccd979bd MF |
2565 | ret = AOP_TRUNCATED_PAGE; |
2566 | } | |
2567 | ||
2568 | return ret; | |
2569 | } | |
2570 | ||
e63aecb6 | 2571 | int ocfs2_inode_lock_atime(struct inode *inode, |
7f1a37e3 | 2572 | struct vfsmount *vfsmnt, |
c4c2416a | 2573 | int *level, int wait) |
7f1a37e3 TY |
2574 | { |
2575 | int ret; | |
2576 | ||
c4c2416a GH |
2577 | if (wait) |
2578 | ret = ocfs2_inode_lock(inode, NULL, 0); | |
2579 | else | |
2580 | ret = ocfs2_try_inode_lock(inode, NULL, 0); | |
2581 | ||
7f1a37e3 | 2582 | if (ret < 0) { |
c4c2416a GH |
2583 | if (ret != -EAGAIN) |
2584 | mlog_errno(ret); | |
7f1a37e3 TY |
2585 | return ret; |
2586 | } | |
2587 | ||
2588 | /* | |
2589 | * If we should update atime, we will get EX lock, | |
2590 | * otherwise we just get PR lock. | |
2591 | */ | |
2592 | if (ocfs2_should_update_atime(inode, vfsmnt)) { | |
2593 | struct buffer_head *bh = NULL; | |
2594 | ||
e63aecb6 | 2595 | ocfs2_inode_unlock(inode, 0); |
c4c2416a GH |
2596 | if (wait) |
2597 | ret = ocfs2_inode_lock(inode, &bh, 1); | |
2598 | else | |
2599 | ret = ocfs2_try_inode_lock(inode, &bh, 1); | |
2600 | ||
7f1a37e3 | 2601 | if (ret < 0) { |
c4c2416a GH |
2602 | if (ret != -EAGAIN) |
2603 | mlog_errno(ret); | |
7f1a37e3 TY |
2604 | return ret; |
2605 | } | |
2606 | *level = 1; | |
2607 | if (ocfs2_should_update_atime(inode, vfsmnt)) | |
2608 | ocfs2_update_inode_atime(inode, bh); | |
a89bd89f | 2609 | brelse(bh); |
7f1a37e3 TY |
2610 | } else |
2611 | *level = 0; | |
2612 | ||
7f1a37e3 TY |
2613 | return ret; |
2614 | } | |
2615 | ||
e63aecb6 | 2616 | void ocfs2_inode_unlock(struct inode *inode, |
ccd979bd MF |
2617 | int ex) |
2618 | { | |
bd3e7610 | 2619 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
e63aecb6 | 2620 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_inode_lockres; |
c271c5c2 | 2621 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 2622 | |
b0697053 MF |
2623 | mlog(0, "inode %llu drop %s META lock\n", |
2624 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
2625 | ex ? "EXMODE" : "PRMODE"); |
2626 | ||
1119d3c0 | 2627 | if (!ocfs2_is_hard_readonly(osb) && |
c271c5c2 | 2628 | !ocfs2_mount_local(osb)) |
1119d3c0 | 2629 | ocfs2_cluster_unlock(osb, lockres, level); |
ccd979bd MF |
2630 | } |
2631 | ||
439a36b8 ER |
2632 | /* |
2633 | * This _tracker variantes are introduced to deal with the recursive cluster | |
2634 | * locking issue. The idea is to keep track of a lock holder on the stack of | |
2635 | * the current process. If there's a lock holder on the stack, we know the | |
2636 | * task context is already protected by cluster locking. Currently, they're | |
2637 | * used in some VFS entry routines. | |
2638 | * | |
2639 | * return < 0 on error, return == 0 if there's no lock holder on the stack | |
2640 | * before this call, return == 1 if this call would be a recursive locking. | |
133b81f2 LC |
2641 | * return == -1 if this lock attempt will cause an upgrade which is forbidden. |
2642 | * | |
2643 | * When taking lock levels into account,we face some different situations. | |
2644 | * | |
2645 | * 1. no lock is held | |
2646 | * In this case, just lock the inode as requested and return 0 | |
2647 | * | |
2648 | * 2. We are holding a lock | |
2649 | * For this situation, things diverges into several cases | |
2650 | * | |
2651 | * wanted holding what to do | |
2652 | * ex ex see 2.1 below | |
2653 | * ex pr see 2.2 below | |
2654 | * pr ex see 2.1 below | |
2655 | * pr pr see 2.1 below | |
2656 | * | |
2657 | * 2.1 lock level that is been held is compatible | |
2658 | * with the wanted level, so no lock action will be tacken. | |
2659 | * | |
2660 | * 2.2 Otherwise, an upgrade is needed, but it is forbidden. | |
2661 | * | |
2662 | * Reason why upgrade within a process is forbidden is that | |
2663 | * lock upgrade may cause dead lock. The following illustrates | |
2664 | * how it happens. | |
2665 | * | |
2666 | * thread on node1 thread on node2 | |
2667 | * ocfs2_inode_lock_tracker(ex=0) | |
2668 | * | |
2669 | * <====== ocfs2_inode_lock_tracker(ex=1) | |
2670 | * | |
2671 | * ocfs2_inode_lock_tracker(ex=1) | |
439a36b8 ER |
2672 | */ |
2673 | int ocfs2_inode_lock_tracker(struct inode *inode, | |
2674 | struct buffer_head **ret_bh, | |
2675 | int ex, | |
2676 | struct ocfs2_lock_holder *oh) | |
2677 | { | |
133b81f2 | 2678 | int status = 0; |
439a36b8 | 2679 | struct ocfs2_lock_res *lockres; |
133b81f2 LC |
2680 | struct ocfs2_lock_holder *tmp_oh; |
2681 | struct pid *pid = task_pid(current); | |
2682 | ||
439a36b8 ER |
2683 | |
2684 | lockres = &OCFS2_I(inode)->ip_inode_lockres; | |
133b81f2 | 2685 | tmp_oh = ocfs2_pid_holder(lockres, pid); |
439a36b8 | 2686 | |
133b81f2 LC |
2687 | if (!tmp_oh) { |
2688 | /* | |
2689 | * This corresponds to the case 1. | |
2690 | * We haven't got any lock before. | |
2691 | */ | |
2692 | status = ocfs2_inode_lock_full(inode, ret_bh, ex, 0); | |
439a36b8 ER |
2693 | if (status < 0) { |
2694 | if (status != -ENOENT) | |
2695 | mlog_errno(status); | |
2696 | return status; | |
2697 | } | |
133b81f2 LC |
2698 | |
2699 | oh->oh_ex = ex; | |
439a36b8 | 2700 | ocfs2_add_holder(lockres, oh); |
133b81f2 LC |
2701 | return 0; |
2702 | } | |
439a36b8 | 2703 | |
133b81f2 LC |
2704 | if (unlikely(ex && !tmp_oh->oh_ex)) { |
2705 | /* | |
2706 | * case 2.2 upgrade may cause dead lock, forbid it. | |
2707 | */ | |
2708 | mlog(ML_ERROR, "Recursive locking is not permitted to " | |
2709 | "upgrade to EX level from PR level.\n"); | |
2710 | dump_stack(); | |
2711 | return -EINVAL; | |
2712 | } | |
2713 | ||
2714 | /* | |
2715 | * case 2.1 OCFS2_META_LOCK_GETBH flag make ocfs2_inode_lock_full. | |
2716 | * ignore the lock level and just update it. | |
2717 | */ | |
2718 | if (ret_bh) { | |
2719 | status = ocfs2_inode_lock_full(inode, ret_bh, ex, | |
2720 | OCFS2_META_LOCK_GETBH); | |
2721 | if (status < 0) { | |
2722 | if (status != -ENOENT) | |
2723 | mlog_errno(status); | |
2724 | return status; | |
2725 | } | |
2726 | } | |
2f566394 | 2727 | return 1; |
439a36b8 ER |
2728 | } |
2729 | ||
2730 | void ocfs2_inode_unlock_tracker(struct inode *inode, | |
2731 | int ex, | |
2732 | struct ocfs2_lock_holder *oh, | |
2733 | int had_lock) | |
2734 | { | |
2735 | struct ocfs2_lock_res *lockres; | |
2736 | ||
2737 | lockres = &OCFS2_I(inode)->ip_inode_lockres; | |
8818efaa | 2738 | /* had_lock means that the currect process already takes the cluster |
133b81f2 LC |
2739 | * lock previously. |
2740 | * If had_lock is 1, we have nothing to do here. | |
2741 | * If had_lock is 0, we will release the lock. | |
8818efaa | 2742 | */ |
439a36b8 | 2743 | if (!had_lock) { |
133b81f2 | 2744 | ocfs2_inode_unlock(inode, oh->oh_ex); |
439a36b8 | 2745 | ocfs2_remove_holder(lockres, oh); |
439a36b8 ER |
2746 | } |
2747 | } | |
2748 | ||
df152c24 | 2749 | int ocfs2_orphan_scan_lock(struct ocfs2_super *osb, u32 *seqno) |
83273932 SE |
2750 | { |
2751 | struct ocfs2_lock_res *lockres; | |
2752 | struct ocfs2_orphan_scan_lvb *lvb; | |
83273932 SE |
2753 | int status = 0; |
2754 | ||
df152c24 SM |
2755 | if (ocfs2_is_hard_readonly(osb)) |
2756 | return -EROFS; | |
2757 | ||
2758 | if (ocfs2_mount_local(osb)) | |
2759 | return 0; | |
2760 | ||
83273932 | 2761 | lockres = &osb->osb_orphan_scan.os_lockres; |
df152c24 | 2762 | status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX, 0, 0); |
83273932 SE |
2763 | if (status < 0) |
2764 | return status; | |
2765 | ||
2766 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
1c520dfb JB |
2767 | if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) && |
2768 | lvb->lvb_version == OCFS2_ORPHAN_LVB_VERSION) | |
83273932 | 2769 | *seqno = be32_to_cpu(lvb->lvb_os_seqno); |
3211949f SM |
2770 | else |
2771 | *seqno = osb->osb_orphan_scan.os_seqno + 1; | |
2772 | ||
83273932 SE |
2773 | return status; |
2774 | } | |
2775 | ||
df152c24 | 2776 | void ocfs2_orphan_scan_unlock(struct ocfs2_super *osb, u32 seqno) |
83273932 SE |
2777 | { |
2778 | struct ocfs2_lock_res *lockres; | |
2779 | struct ocfs2_orphan_scan_lvb *lvb; | |
83273932 | 2780 | |
df152c24 SM |
2781 | if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb)) { |
2782 | lockres = &osb->osb_orphan_scan.os_lockres; | |
2783 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
2784 | lvb->lvb_version = OCFS2_ORPHAN_LVB_VERSION; | |
2785 | lvb->lvb_os_seqno = cpu_to_be32(seqno); | |
2786 | ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX); | |
2787 | } | |
83273932 SE |
2788 | } |
2789 | ||
ccd979bd MF |
2790 | int ocfs2_super_lock(struct ocfs2_super *osb, |
2791 | int ex) | |
2792 | { | |
c271c5c2 | 2793 | int status = 0; |
bd3e7610 | 2794 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd | 2795 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; |
ccd979bd | 2796 | |
ccd979bd MF |
2797 | if (ocfs2_is_hard_readonly(osb)) |
2798 | return -EROFS; | |
2799 | ||
c271c5c2 SM |
2800 | if (ocfs2_mount_local(osb)) |
2801 | goto bail; | |
2802 | ||
ccd979bd MF |
2803 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); |
2804 | if (status < 0) { | |
2805 | mlog_errno(status); | |
2806 | goto bail; | |
2807 | } | |
2808 | ||
2809 | /* The super block lock path is really in the best position to | |
2810 | * know when resources covered by the lock need to be | |
2811 | * refreshed, so we do it here. Of course, making sense of | |
2812 | * everything is up to the caller :) */ | |
2813 | status = ocfs2_should_refresh_lock_res(lockres); | |
ccd979bd | 2814 | if (status) { |
8e8a4603 | 2815 | status = ocfs2_refresh_slot_info(osb); |
ccd979bd MF |
2816 | |
2817 | ocfs2_complete_lock_res_refresh(lockres, status); | |
2818 | ||
3278bb74 JB |
2819 | if (status < 0) { |
2820 | ocfs2_cluster_unlock(osb, lockres, level); | |
ccd979bd | 2821 | mlog_errno(status); |
3278bb74 | 2822 | } |
8ddb7b00 | 2823 | ocfs2_track_lock_refresh(lockres); |
ccd979bd MF |
2824 | } |
2825 | bail: | |
ccd979bd MF |
2826 | return status; |
2827 | } | |
2828 | ||
2829 | void ocfs2_super_unlock(struct ocfs2_super *osb, | |
2830 | int ex) | |
2831 | { | |
bd3e7610 | 2832 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd MF |
2833 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; |
2834 | ||
c271c5c2 SM |
2835 | if (!ocfs2_mount_local(osb)) |
2836 | ocfs2_cluster_unlock(osb, lockres, level); | |
ccd979bd MF |
2837 | } |
2838 | ||
2839 | int ocfs2_rename_lock(struct ocfs2_super *osb) | |
2840 | { | |
2841 | int status; | |
2842 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; | |
2843 | ||
2844 | if (ocfs2_is_hard_readonly(osb)) | |
2845 | return -EROFS; | |
2846 | ||
c271c5c2 SM |
2847 | if (ocfs2_mount_local(osb)) |
2848 | return 0; | |
2849 | ||
bd3e7610 | 2850 | status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX, 0, 0); |
ccd979bd MF |
2851 | if (status < 0) |
2852 | mlog_errno(status); | |
2853 | ||
2854 | return status; | |
2855 | } | |
2856 | ||
2857 | void ocfs2_rename_unlock(struct ocfs2_super *osb) | |
2858 | { | |
2859 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; | |
2860 | ||
c271c5c2 | 2861 | if (!ocfs2_mount_local(osb)) |
bd3e7610 | 2862 | ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX); |
ccd979bd MF |
2863 | } |
2864 | ||
6ca497a8 | 2865 | int ocfs2_nfs_sync_lock(struct ocfs2_super *osb, int ex) |
2866 | { | |
2867 | int status; | |
2868 | struct ocfs2_lock_res *lockres = &osb->osb_nfs_sync_lockres; | |
2869 | ||
2870 | if (ocfs2_is_hard_readonly(osb)) | |
2871 | return -EROFS; | |
2872 | ||
4cd9973f JB |
2873 | if (ex) |
2874 | down_write(&osb->nfs_sync_rwlock); | |
2875 | else | |
2876 | down_read(&osb->nfs_sync_rwlock); | |
2877 | ||
6ca497a8 | 2878 | if (ocfs2_mount_local(osb)) |
2879 | return 0; | |
2880 | ||
2881 | status = ocfs2_cluster_lock(osb, lockres, ex ? LKM_EXMODE : LKM_PRMODE, | |
2882 | 0, 0); | |
57c720d4 | 2883 | if (status < 0) { |
6ca497a8 | 2884 | mlog(ML_ERROR, "lock on nfs sync lock failed %d\n", status); |
2885 | ||
57c720d4 PM |
2886 | if (ex) |
2887 | up_write(&osb->nfs_sync_rwlock); | |
2888 | else | |
2889 | up_read(&osb->nfs_sync_rwlock); | |
2890 | } | |
2891 | ||
6ca497a8 | 2892 | return status; |
2893 | } | |
2894 | ||
2895 | void ocfs2_nfs_sync_unlock(struct ocfs2_super *osb, int ex) | |
2896 | { | |
2897 | struct ocfs2_lock_res *lockres = &osb->osb_nfs_sync_lockres; | |
2898 | ||
2899 | if (!ocfs2_mount_local(osb)) | |
2900 | ocfs2_cluster_unlock(osb, lockres, | |
2901 | ex ? LKM_EXMODE : LKM_PRMODE); | |
4cd9973f JB |
2902 | if (ex) |
2903 | up_write(&osb->nfs_sync_rwlock); | |
2904 | else | |
2905 | up_read(&osb->nfs_sync_rwlock); | |
6ca497a8 | 2906 | } |
2907 | ||
4882abeb GH |
2908 | int ocfs2_trim_fs_lock(struct ocfs2_super *osb, |
2909 | struct ocfs2_trim_fs_info *info, int trylock) | |
2910 | { | |
2911 | int status; | |
2912 | struct ocfs2_trim_fs_lvb *lvb; | |
2913 | struct ocfs2_lock_res *lockres = &osb->osb_trim_fs_lockres; | |
2914 | ||
2915 | if (info) | |
2916 | info->tf_valid = 0; | |
2917 | ||
2918 | if (ocfs2_is_hard_readonly(osb)) | |
2919 | return -EROFS; | |
2920 | ||
2921 | if (ocfs2_mount_local(osb)) | |
2922 | return 0; | |
2923 | ||
2924 | status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX, | |
2925 | trylock ? DLM_LKF_NOQUEUE : 0, 0); | |
2926 | if (status < 0) { | |
2927 | if (status != -EAGAIN) | |
2928 | mlog_errno(status); | |
2929 | return status; | |
2930 | } | |
2931 | ||
2932 | if (info) { | |
2933 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
2934 | if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) && | |
2935 | lvb->lvb_version == OCFS2_TRIMFS_LVB_VERSION) { | |
2936 | info->tf_valid = 1; | |
2937 | info->tf_success = lvb->lvb_success; | |
2938 | info->tf_nodenum = be32_to_cpu(lvb->lvb_nodenum); | |
2939 | info->tf_start = be64_to_cpu(lvb->lvb_start); | |
2940 | info->tf_len = be64_to_cpu(lvb->lvb_len); | |
2941 | info->tf_minlen = be64_to_cpu(lvb->lvb_minlen); | |
2942 | info->tf_trimlen = be64_to_cpu(lvb->lvb_trimlen); | |
2943 | } | |
2944 | } | |
2945 | ||
2946 | return status; | |
2947 | } | |
2948 | ||
2949 | void ocfs2_trim_fs_unlock(struct ocfs2_super *osb, | |
2950 | struct ocfs2_trim_fs_info *info) | |
2951 | { | |
2952 | struct ocfs2_trim_fs_lvb *lvb; | |
2953 | struct ocfs2_lock_res *lockres = &osb->osb_trim_fs_lockres; | |
2954 | ||
2955 | if (ocfs2_mount_local(osb)) | |
2956 | return; | |
2957 | ||
2958 | if (info) { | |
2959 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
2960 | lvb->lvb_version = OCFS2_TRIMFS_LVB_VERSION; | |
2961 | lvb->lvb_success = info->tf_success; | |
2962 | lvb->lvb_nodenum = cpu_to_be32(info->tf_nodenum); | |
2963 | lvb->lvb_start = cpu_to_be64(info->tf_start); | |
2964 | lvb->lvb_len = cpu_to_be64(info->tf_len); | |
2965 | lvb->lvb_minlen = cpu_to_be64(info->tf_minlen); | |
2966 | lvb->lvb_trimlen = cpu_to_be64(info->tf_trimlen); | |
2967 | } | |
2968 | ||
2969 | ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX); | |
2970 | } | |
2971 | ||
d680efe9 MF |
2972 | int ocfs2_dentry_lock(struct dentry *dentry, int ex) |
2973 | { | |
2974 | int ret; | |
bd3e7610 | 2975 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
d680efe9 MF |
2976 | struct ocfs2_dentry_lock *dl = dentry->d_fsdata; |
2977 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); | |
2978 | ||
2979 | BUG_ON(!dl); | |
2980 | ||
03efed8a TY |
2981 | if (ocfs2_is_hard_readonly(osb)) { |
2982 | if (ex) | |
2983 | return -EROFS; | |
2984 | return 0; | |
2985 | } | |
d680efe9 | 2986 | |
c271c5c2 SM |
2987 | if (ocfs2_mount_local(osb)) |
2988 | return 0; | |
2989 | ||
d680efe9 MF |
2990 | ret = ocfs2_cluster_lock(osb, &dl->dl_lockres, level, 0, 0); |
2991 | if (ret < 0) | |
2992 | mlog_errno(ret); | |
2993 | ||
2994 | return ret; | |
2995 | } | |
2996 | ||
2997 | void ocfs2_dentry_unlock(struct dentry *dentry, int ex) | |
2998 | { | |
bd3e7610 | 2999 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
d680efe9 MF |
3000 | struct ocfs2_dentry_lock *dl = dentry->d_fsdata; |
3001 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); | |
3002 | ||
03efed8a | 3003 | if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb)) |
c271c5c2 | 3004 | ocfs2_cluster_unlock(osb, &dl->dl_lockres, level); |
d680efe9 MF |
3005 | } |
3006 | ||
ccd979bd MF |
3007 | /* Reference counting of the dlm debug structure. We want this because |
3008 | * open references on the debug inodes can live on after a mount, so | |
3009 | * we can't rely on the ocfs2_super to always exist. */ | |
3010 | static void ocfs2_dlm_debug_free(struct kref *kref) | |
3011 | { | |
3012 | struct ocfs2_dlm_debug *dlm_debug; | |
3013 | ||
3014 | dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt); | |
3015 | ||
3016 | kfree(dlm_debug); | |
3017 | } | |
3018 | ||
3019 | void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug) | |
3020 | { | |
3021 | if (dlm_debug) | |
3022 | kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free); | |
3023 | } | |
3024 | ||
3025 | static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug) | |
3026 | { | |
3027 | kref_get(&debug->d_refcnt); | |
3028 | } | |
3029 | ||
3030 | struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void) | |
3031 | { | |
3032 | struct ocfs2_dlm_debug *dlm_debug; | |
3033 | ||
3034 | dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL); | |
3035 | if (!dlm_debug) { | |
3036 | mlog_errno(-ENOMEM); | |
3037 | goto out; | |
3038 | } | |
3039 | ||
3040 | kref_init(&dlm_debug->d_refcnt); | |
3041 | INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking); | |
8056773a | 3042 | dlm_debug->d_filter_secs = 0; |
ccd979bd MF |
3043 | out: |
3044 | return dlm_debug; | |
3045 | } | |
3046 | ||
3047 | /* Access to this is arbitrated for us via seq_file->sem. */ | |
3048 | struct ocfs2_dlm_seq_priv { | |
3049 | struct ocfs2_dlm_debug *p_dlm_debug; | |
3050 | struct ocfs2_lock_res p_iter_res; | |
3051 | struct ocfs2_lock_res p_tmp_res; | |
3052 | }; | |
3053 | ||
3054 | static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start, | |
3055 | struct ocfs2_dlm_seq_priv *priv) | |
3056 | { | |
3057 | struct ocfs2_lock_res *iter, *ret = NULL; | |
3058 | struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug; | |
3059 | ||
3060 | assert_spin_locked(&ocfs2_dlm_tracking_lock); | |
3061 | ||
3062 | list_for_each_entry(iter, &start->l_debug_list, l_debug_list) { | |
3063 | /* discover the head of the list */ | |
3064 | if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) { | |
3065 | mlog(0, "End of list found, %p\n", ret); | |
3066 | break; | |
3067 | } | |
3068 | ||
3069 | /* We track our "dummy" iteration lockres' by a NULL | |
3070 | * l_ops field. */ | |
3071 | if (iter->l_ops != NULL) { | |
3072 | ret = iter; | |
3073 | break; | |
3074 | } | |
3075 | } | |
3076 | ||
3077 | return ret; | |
3078 | } | |
3079 | ||
3080 | static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos) | |
3081 | { | |
3082 | struct ocfs2_dlm_seq_priv *priv = m->private; | |
3083 | struct ocfs2_lock_res *iter; | |
3084 | ||
3085 | spin_lock(&ocfs2_dlm_tracking_lock); | |
3086 | iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv); | |
3087 | if (iter) { | |
3088 | /* Since lockres' have the lifetime of their container | |
3089 | * (which can be inodes, ocfs2_supers, etc) we want to | |
3090 | * copy this out to a temporary lockres while still | |
3091 | * under the spinlock. Obviously after this we can't | |
3092 | * trust any pointers on the copy returned, but that's | |
3093 | * ok as the information we want isn't typically held | |
3094 | * in them. */ | |
3095 | priv->p_tmp_res = *iter; | |
3096 | iter = &priv->p_tmp_res; | |
3097 | } | |
3098 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
3099 | ||
3100 | return iter; | |
3101 | } | |
3102 | ||
3103 | static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v) | |
3104 | { | |
3105 | } | |
3106 | ||
3107 | static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
3108 | { | |
3109 | struct ocfs2_dlm_seq_priv *priv = m->private; | |
3110 | struct ocfs2_lock_res *iter = v; | |
3111 | struct ocfs2_lock_res *dummy = &priv->p_iter_res; | |
3112 | ||
3113 | spin_lock(&ocfs2_dlm_tracking_lock); | |
3114 | iter = ocfs2_dlm_next_res(iter, priv); | |
3115 | list_del_init(&dummy->l_debug_list); | |
3116 | if (iter) { | |
3117 | list_add(&dummy->l_debug_list, &iter->l_debug_list); | |
3118 | priv->p_tmp_res = *iter; | |
3119 | iter = &priv->p_tmp_res; | |
3120 | } | |
3121 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
3122 | ||
3123 | return iter; | |
3124 | } | |
3125 | ||
5bc970e8 SM |
3126 | /* |
3127 | * Version is used by debugfs.ocfs2 to determine the format being used | |
3128 | * | |
3129 | * New in version 2 | |
3130 | * - Lock stats printed | |
3131 | * New in version 3 | |
3132 | * - Max time in lock stats is in usecs (instead of nsecs) | |
8a7f5f4c | 3133 | * New in version 4 |
5da844a2 | 3134 | * - Add last pr/ex unlock times and first lock wait time in usecs |
5bc970e8 | 3135 | */ |
8a7f5f4c | 3136 | #define OCFS2_DLM_DEBUG_STR_VERSION 4 |
ccd979bd MF |
3137 | static int ocfs2_dlm_seq_show(struct seq_file *m, void *v) |
3138 | { | |
3139 | int i; | |
3140 | char *lvb; | |
3141 | struct ocfs2_lock_res *lockres = v; | |
8056773a GH |
3142 | #ifdef CONFIG_OCFS2_FS_STATS |
3143 | u64 now, last; | |
3144 | struct ocfs2_dlm_debug *dlm_debug = | |
3145 | ((struct ocfs2_dlm_seq_priv *)m->private)->p_dlm_debug; | |
3146 | #endif | |
ccd979bd MF |
3147 | |
3148 | if (!lockres) | |
3149 | return -EINVAL; | |
3150 | ||
8056773a | 3151 | #ifdef CONFIG_OCFS2_FS_STATS |
5da844a2 | 3152 | if (!lockres->l_lock_wait && dlm_debug->d_filter_secs) { |
8056773a GH |
3153 | now = ktime_to_us(ktime_get_real()); |
3154 | if (lockres->l_lock_prmode.ls_last > | |
3155 | lockres->l_lock_exmode.ls_last) | |
3156 | last = lockres->l_lock_prmode.ls_last; | |
3157 | else | |
3158 | last = lockres->l_lock_exmode.ls_last; | |
3159 | /* | |
3160 | * Use d_filter_secs field to filter lock resources dump, | |
3161 | * the default d_filter_secs(0) value filters nothing, | |
3162 | * otherwise, only dump the last N seconds active lock | |
3163 | * resources. | |
3164 | */ | |
3165 | if (div_u64(now - last, 1000000) > dlm_debug->d_filter_secs) | |
3166 | return 0; | |
3167 | } | |
3168 | #endif | |
3169 | ||
d680efe9 MF |
3170 | seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION); |
3171 | ||
3172 | if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY) | |
3173 | seq_printf(m, "%.*s%08x\t", OCFS2_DENTRY_LOCK_INO_START - 1, | |
3174 | lockres->l_name, | |
3175 | (unsigned int)ocfs2_get_dentry_lock_ino(lockres)); | |
3176 | else | |
3177 | seq_printf(m, "%.*s\t", OCFS2_LOCK_ID_MAX_LEN, lockres->l_name); | |
3178 | ||
3179 | seq_printf(m, "%d\t" | |
ccd979bd MF |
3180 | "0x%lx\t" |
3181 | "0x%x\t" | |
3182 | "0x%x\t" | |
3183 | "%u\t" | |
3184 | "%u\t" | |
3185 | "%d\t" | |
3186 | "%d\t", | |
ccd979bd MF |
3187 | lockres->l_level, |
3188 | lockres->l_flags, | |
3189 | lockres->l_action, | |
3190 | lockres->l_unlock_action, | |
3191 | lockres->l_ro_holders, | |
3192 | lockres->l_ex_holders, | |
3193 | lockres->l_requested, | |
3194 | lockres->l_blocking); | |
3195 | ||
3196 | /* Dump the raw LVB */ | |
8f2c9c1b | 3197 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
ccd979bd MF |
3198 | for(i = 0; i < DLM_LVB_LEN; i++) |
3199 | seq_printf(m, "0x%x\t", lvb[i]); | |
3200 | ||
8ddb7b00 | 3201 | #ifdef CONFIG_OCFS2_FS_STATS |
5bc970e8 SM |
3202 | # define lock_num_prmode(_l) ((_l)->l_lock_prmode.ls_gets) |
3203 | # define lock_num_exmode(_l) ((_l)->l_lock_exmode.ls_gets) | |
3204 | # define lock_num_prmode_failed(_l) ((_l)->l_lock_prmode.ls_fail) | |
3205 | # define lock_num_exmode_failed(_l) ((_l)->l_lock_exmode.ls_fail) | |
3206 | # define lock_total_prmode(_l) ((_l)->l_lock_prmode.ls_total) | |
3207 | # define lock_total_exmode(_l) ((_l)->l_lock_exmode.ls_total) | |
3208 | # define lock_max_prmode(_l) ((_l)->l_lock_prmode.ls_max) | |
3209 | # define lock_max_exmode(_l) ((_l)->l_lock_exmode.ls_max) | |
3210 | # define lock_refresh(_l) ((_l)->l_lock_refresh) | |
8a7f5f4c GH |
3211 | # define lock_last_prmode(_l) ((_l)->l_lock_prmode.ls_last) |
3212 | # define lock_last_exmode(_l) ((_l)->l_lock_exmode.ls_last) | |
5da844a2 | 3213 | # define lock_wait(_l) ((_l)->l_lock_wait) |
8ddb7b00 | 3214 | #else |
5bc970e8 SM |
3215 | # define lock_num_prmode(_l) (0) |
3216 | # define lock_num_exmode(_l) (0) | |
8ddb7b00 SM |
3217 | # define lock_num_prmode_failed(_l) (0) |
3218 | # define lock_num_exmode_failed(_l) (0) | |
dd25e55e RD |
3219 | # define lock_total_prmode(_l) (0ULL) |
3220 | # define lock_total_exmode(_l) (0ULL) | |
8ddb7b00 SM |
3221 | # define lock_max_prmode(_l) (0) |
3222 | # define lock_max_exmode(_l) (0) | |
3223 | # define lock_refresh(_l) (0) | |
8a7f5f4c GH |
3224 | # define lock_last_prmode(_l) (0ULL) |
3225 | # define lock_last_exmode(_l) (0ULL) | |
5da844a2 | 3226 | # define lock_wait(_l) (0ULL) |
8ddb7b00 SM |
3227 | #endif |
3228 | /* The following seq_print was added in version 2 of this output */ | |
5bc970e8 SM |
3229 | seq_printf(m, "%u\t" |
3230 | "%u\t" | |
8ddb7b00 SM |
3231 | "%u\t" |
3232 | "%u\t" | |
3233 | "%llu\t" | |
3234 | "%llu\t" | |
3235 | "%u\t" | |
3236 | "%u\t" | |
8a7f5f4c GH |
3237 | "%u\t" |
3238 | "%llu\t" | |
5da844a2 | 3239 | "%llu\t" |
8a7f5f4c | 3240 | "%llu\t", |
8ddb7b00 SM |
3241 | lock_num_prmode(lockres), |
3242 | lock_num_exmode(lockres), | |
3243 | lock_num_prmode_failed(lockres), | |
3244 | lock_num_exmode_failed(lockres), | |
3245 | lock_total_prmode(lockres), | |
3246 | lock_total_exmode(lockres), | |
3247 | lock_max_prmode(lockres), | |
3248 | lock_max_exmode(lockres), | |
8a7f5f4c GH |
3249 | lock_refresh(lockres), |
3250 | lock_last_prmode(lockres), | |
5da844a2 GH |
3251 | lock_last_exmode(lockres), |
3252 | lock_wait(lockres)); | |
8ddb7b00 | 3253 | |
ccd979bd MF |
3254 | /* End the line */ |
3255 | seq_printf(m, "\n"); | |
3256 | return 0; | |
3257 | } | |
3258 | ||
90d99779 | 3259 | static const struct seq_operations ocfs2_dlm_seq_ops = { |
ccd979bd MF |
3260 | .start = ocfs2_dlm_seq_start, |
3261 | .stop = ocfs2_dlm_seq_stop, | |
3262 | .next = ocfs2_dlm_seq_next, | |
3263 | .show = ocfs2_dlm_seq_show, | |
3264 | }; | |
3265 | ||
3266 | static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file) | |
3267 | { | |
33fa1d90 | 3268 | struct seq_file *seq = file->private_data; |
ccd979bd MF |
3269 | struct ocfs2_dlm_seq_priv *priv = seq->private; |
3270 | struct ocfs2_lock_res *res = &priv->p_iter_res; | |
3271 | ||
3272 | ocfs2_remove_lockres_tracking(res); | |
3273 | ocfs2_put_dlm_debug(priv->p_dlm_debug); | |
3274 | return seq_release_private(inode, file); | |
3275 | } | |
3276 | ||
3277 | static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file) | |
3278 | { | |
ccd979bd | 3279 | struct ocfs2_dlm_seq_priv *priv; |
ccd979bd MF |
3280 | struct ocfs2_super *osb; |
3281 | ||
1848cb55 | 3282 | priv = __seq_open_private(file, &ocfs2_dlm_seq_ops, sizeof(*priv)); |
ccd979bd | 3283 | if (!priv) { |
1848cb55 RJ |
3284 | mlog_errno(-ENOMEM); |
3285 | return -ENOMEM; | |
ccd979bd | 3286 | } |
1848cb55 | 3287 | |
8e18e294 | 3288 | osb = inode->i_private; |
ccd979bd MF |
3289 | ocfs2_get_dlm_debug(osb->osb_dlm_debug); |
3290 | priv->p_dlm_debug = osb->osb_dlm_debug; | |
3291 | INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list); | |
3292 | ||
ccd979bd MF |
3293 | ocfs2_add_lockres_tracking(&priv->p_iter_res, |
3294 | priv->p_dlm_debug); | |
3295 | ||
1848cb55 | 3296 | return 0; |
ccd979bd MF |
3297 | } |
3298 | ||
4b6f5d20 | 3299 | static const struct file_operations ocfs2_dlm_debug_fops = { |
ccd979bd MF |
3300 | .open = ocfs2_dlm_debug_open, |
3301 | .release = ocfs2_dlm_debug_release, | |
3302 | .read = seq_read, | |
3303 | .llseek = seq_lseek, | |
3304 | }; | |
3305 | ||
e581595e | 3306 | static void ocfs2_dlm_init_debug(struct ocfs2_super *osb) |
ccd979bd | 3307 | { |
ccd979bd MF |
3308 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; |
3309 | ||
5e7a3ed9 GKH |
3310 | debugfs_create_file("locking_state", S_IFREG|S_IRUSR, |
3311 | osb->osb_debug_root, osb, &ocfs2_dlm_debug_fops); | |
ccd979bd | 3312 | |
5e7a3ed9 GKH |
3313 | debugfs_create_u32("locking_filter", 0600, osb->osb_debug_root, |
3314 | &dlm_debug->d_filter_secs); | |
b73eba2a | 3315 | ocfs2_get_dlm_debug(dlm_debug); |
ccd979bd MF |
3316 | } |
3317 | ||
3318 | static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb) | |
3319 | { | |
3320 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; | |
3321 | ||
5e7a3ed9 | 3322 | if (dlm_debug) |
ccd979bd | 3323 | ocfs2_put_dlm_debug(dlm_debug); |
ccd979bd MF |
3324 | } |
3325 | ||
3326 | int ocfs2_dlm_init(struct ocfs2_super *osb) | |
3327 | { | |
c271c5c2 | 3328 | int status = 0; |
4670c46d | 3329 | struct ocfs2_cluster_connection *conn = NULL; |
ccd979bd | 3330 | |
0abd6d18 MF |
3331 | if (ocfs2_mount_local(osb)) { |
3332 | osb->node_num = 0; | |
c271c5c2 | 3333 | goto local; |
0abd6d18 | 3334 | } |
c271c5c2 | 3335 | |
e581595e | 3336 | ocfs2_dlm_init_debug(osb); |
ccd979bd | 3337 | |
34d024f8 | 3338 | /* launch downconvert thread */ |
5afc44e2 JQ |
3339 | osb->dc_task = kthread_run(ocfs2_downconvert_thread, osb, "ocfs2dc-%s", |
3340 | osb->uuid_str); | |
34d024f8 MF |
3341 | if (IS_ERR(osb->dc_task)) { |
3342 | status = PTR_ERR(osb->dc_task); | |
3343 | osb->dc_task = NULL; | |
ccd979bd MF |
3344 | mlog_errno(status); |
3345 | goto bail; | |
3346 | } | |
3347 | ||
ccd979bd | 3348 | /* for now, uuid == domain */ |
9c6c877c | 3349 | status = ocfs2_cluster_connect(osb->osb_cluster_stack, |
c74a3bdd GR |
3350 | osb->osb_cluster_name, |
3351 | strlen(osb->osb_cluster_name), | |
9c6c877c | 3352 | osb->uuid_str, |
4670c46d | 3353 | strlen(osb->uuid_str), |
553b5eb9 | 3354 | &lproto, ocfs2_do_node_down, osb, |
4670c46d JB |
3355 | &conn); |
3356 | if (status) { | |
ccd979bd MF |
3357 | mlog_errno(status); |
3358 | goto bail; | |
3359 | } | |
3360 | ||
3e834151 | 3361 | status = ocfs2_cluster_this_node(conn, &osb->node_num); |
0abd6d18 MF |
3362 | if (status < 0) { |
3363 | mlog_errno(status); | |
3364 | mlog(ML_ERROR, | |
3365 | "could not find this host's node number\n"); | |
286eaa95 | 3366 | ocfs2_cluster_disconnect(conn, 0); |
0abd6d18 MF |
3367 | goto bail; |
3368 | } | |
3369 | ||
c271c5c2 | 3370 | local: |
ccd979bd MF |
3371 | ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb); |
3372 | ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb); | |
4cd9973f | 3373 | ocfs2_nfs_sync_lock_init(osb); |
83273932 | 3374 | ocfs2_orphan_scan_lock_res_init(&osb->osb_orphan_scan.os_lockres, osb); |
ccd979bd | 3375 | |
4670c46d | 3376 | osb->cconn = conn; |
ccd979bd MF |
3377 | bail: |
3378 | if (status < 0) { | |
3379 | ocfs2_dlm_shutdown_debug(osb); | |
34d024f8 MF |
3380 | if (osb->dc_task) |
3381 | kthread_stop(osb->dc_task); | |
ccd979bd MF |
3382 | } |
3383 | ||
ccd979bd MF |
3384 | return status; |
3385 | } | |
3386 | ||
286eaa95 JB |
3387 | void ocfs2_dlm_shutdown(struct ocfs2_super *osb, |
3388 | int hangup_pending) | |
ccd979bd | 3389 | { |
ccd979bd MF |
3390 | ocfs2_drop_osb_locks(osb); |
3391 | ||
4670c46d JB |
3392 | /* |
3393 | * Now that we have dropped all locks and ocfs2_dismount_volume() | |
3394 | * has disabled recovery, the DLM won't be talking to us. It's | |
3395 | * safe to tear things down before disconnecting the cluster. | |
3396 | */ | |
3397 | ||
34d024f8 MF |
3398 | if (osb->dc_task) { |
3399 | kthread_stop(osb->dc_task); | |
3400 | osb->dc_task = NULL; | |
ccd979bd MF |
3401 | } |
3402 | ||
3403 | ocfs2_lock_res_free(&osb->osb_super_lockres); | |
3404 | ocfs2_lock_res_free(&osb->osb_rename_lockres); | |
6ca497a8 | 3405 | ocfs2_lock_res_free(&osb->osb_nfs_sync_lockres); |
83273932 | 3406 | ocfs2_lock_res_free(&osb->osb_orphan_scan.os_lockres); |
ccd979bd | 3407 | |
550842cc HZ |
3408 | if (osb->cconn) { |
3409 | ocfs2_cluster_disconnect(osb->cconn, hangup_pending); | |
3410 | osb->cconn = NULL; | |
ccd979bd | 3411 | |
550842cc HZ |
3412 | ocfs2_dlm_shutdown_debug(osb); |
3413 | } | |
ccd979bd MF |
3414 | } |
3415 | ||
ccd979bd | 3416 | static int ocfs2_drop_lock(struct ocfs2_super *osb, |
0d5dc6c2 | 3417 | struct ocfs2_lock_res *lockres) |
ccd979bd | 3418 | { |
7431cd7e | 3419 | int ret; |
ccd979bd | 3420 | unsigned long flags; |
bd3e7610 | 3421 | u32 lkm_flags = 0; |
ccd979bd MF |
3422 | |
3423 | /* We didn't get anywhere near actually using this lockres. */ | |
3424 | if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) | |
3425 | goto out; | |
3426 | ||
b80fc012 | 3427 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
bd3e7610 | 3428 | lkm_flags |= DLM_LKF_VALBLK; |
b80fc012 | 3429 | |
ccd979bd MF |
3430 | spin_lock_irqsave(&lockres->l_lock, flags); |
3431 | ||
3432 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING), | |
3433 | "lockres %s, flags 0x%lx\n", | |
3434 | lockres->l_name, lockres->l_flags); | |
3435 | ||
3436 | while (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
3437 | mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = " | |
3438 | "%u, unlock_action = %u\n", | |
3439 | lockres->l_name, lockres->l_flags, lockres->l_action, | |
3440 | lockres->l_unlock_action); | |
3441 | ||
3442 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3443 | ||
3444 | /* XXX: Today we just wait on any busy | |
3445 | * locks... Perhaps we need to cancel converts in the | |
3446 | * future? */ | |
3447 | ocfs2_wait_on_busy_lock(lockres); | |
3448 | ||
3449 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3450 | } | |
3451 | ||
0d5dc6c2 MF |
3452 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) { |
3453 | if (lockres->l_flags & OCFS2_LOCK_ATTACHED && | |
bd3e7610 | 3454 | lockres->l_level == DLM_LOCK_EX && |
0d5dc6c2 MF |
3455 | !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) |
3456 | lockres->l_ops->set_lvb(lockres); | |
3457 | } | |
ccd979bd MF |
3458 | |
3459 | if (lockres->l_flags & OCFS2_LOCK_BUSY) | |
3460 | mlog(ML_ERROR, "destroying busy lock: \"%s\"\n", | |
3461 | lockres->l_name); | |
3462 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) | |
3463 | mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name); | |
3464 | ||
3465 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { | |
3466 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3467 | goto out; | |
3468 | } | |
3469 | ||
3470 | lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED); | |
3471 | ||
3472 | /* make sure we never get here while waiting for an ast to | |
3473 | * fire. */ | |
3474 | BUG_ON(lockres->l_action != OCFS2_AST_INVALID); | |
3475 | ||
3476 | /* is this necessary? */ | |
3477 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
3478 | lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK; | |
3479 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3480 | ||
3481 | mlog(0, "lock %s\n", lockres->l_name); | |
3482 | ||
a796d286 | 3483 | ret = ocfs2_dlm_unlock(osb->cconn, &lockres->l_lksb, lkm_flags); |
7431cd7e JB |
3484 | if (ret) { |
3485 | ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres); | |
ccd979bd | 3486 | mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags); |
cf0acdcd | 3487 | ocfs2_dlm_dump_lksb(&lockres->l_lksb); |
ccd979bd MF |
3488 | BUG(); |
3489 | } | |
73ac36ea | 3490 | mlog(0, "lock %s, successful return from ocfs2_dlm_unlock\n", |
ccd979bd MF |
3491 | lockres->l_name); |
3492 | ||
3493 | ocfs2_wait_on_busy_lock(lockres); | |
3494 | out: | |
ccd979bd MF |
3495 | return 0; |
3496 | } | |
3497 | ||
84d86f83 JK |
3498 | static void ocfs2_process_blocked_lock(struct ocfs2_super *osb, |
3499 | struct ocfs2_lock_res *lockres); | |
3500 | ||
ccd979bd MF |
3501 | /* Mark the lockres as being dropped. It will no longer be |
3502 | * queued if blocking, but we still may have to wait on it | |
34d024f8 | 3503 | * being dequeued from the downconvert thread before we can consider |
2bd63216 | 3504 | * it safe to drop. |
ccd979bd MF |
3505 | * |
3506 | * You can *not* attempt to call cluster_lock on this lockres anymore. */ | |
84d86f83 JK |
3507 | void ocfs2_mark_lockres_freeing(struct ocfs2_super *osb, |
3508 | struct ocfs2_lock_res *lockres) | |
ccd979bd MF |
3509 | { |
3510 | int status; | |
3511 | struct ocfs2_mask_waiter mw; | |
84d86f83 | 3512 | unsigned long flags, flags2; |
ccd979bd MF |
3513 | |
3514 | ocfs2_init_mask_waiter(&mw); | |
3515 | ||
3516 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3517 | lockres->l_flags |= OCFS2_LOCK_FREEING; | |
84d86f83 JK |
3518 | if (lockres->l_flags & OCFS2_LOCK_QUEUED && current == osb->dc_task) { |
3519 | /* | |
3520 | * We know the downconvert is queued but not in progress | |
3521 | * because we are the downconvert thread and processing | |
3522 | * different lock. So we can just remove the lock from the | |
3523 | * queue. This is not only an optimization but also a way | |
3524 | * to avoid the following deadlock: | |
3525 | * ocfs2_dentry_post_unlock() | |
3526 | * ocfs2_dentry_lock_put() | |
3527 | * ocfs2_drop_dentry_lock() | |
3528 | * iput() | |
3529 | * ocfs2_evict_inode() | |
3530 | * ocfs2_clear_inode() | |
3531 | * ocfs2_mark_lockres_freeing() | |
3532 | * ... blocks waiting for OCFS2_LOCK_QUEUED | |
3533 | * since we are the downconvert thread which | |
3534 | * should clear the flag. | |
3535 | */ | |
3536 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3537 | spin_lock_irqsave(&osb->dc_task_lock, flags2); | |
3538 | list_del_init(&lockres->l_blocked_list); | |
3539 | osb->blocked_lock_count--; | |
3540 | spin_unlock_irqrestore(&osb->dc_task_lock, flags2); | |
3541 | /* | |
3542 | * Warn if we recurse into another post_unlock call. Strictly | |
3543 | * speaking it isn't a problem but we need to be careful if | |
3544 | * that happens (stack overflow, deadlocks, ...) so warn if | |
3545 | * ocfs2 grows a path for which this can happen. | |
3546 | */ | |
3547 | WARN_ON_ONCE(lockres->l_ops->post_unlock); | |
3548 | /* Since the lock is freeing we don't do much in the fn below */ | |
3549 | ocfs2_process_blocked_lock(osb, lockres); | |
3550 | return; | |
3551 | } | |
ccd979bd MF |
3552 | while (lockres->l_flags & OCFS2_LOCK_QUEUED) { |
3553 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0); | |
3554 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3555 | ||
3556 | mlog(0, "Waiting on lockres %s\n", lockres->l_name); | |
3557 | ||
3558 | status = ocfs2_wait_for_mask(&mw); | |
3559 | if (status) | |
3560 | mlog_errno(status); | |
3561 | ||
3562 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3563 | } | |
3564 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3565 | } | |
3566 | ||
d680efe9 MF |
3567 | void ocfs2_simple_drop_lockres(struct ocfs2_super *osb, |
3568 | struct ocfs2_lock_res *lockres) | |
ccd979bd | 3569 | { |
d680efe9 | 3570 | int ret; |
ccd979bd | 3571 | |
84d86f83 | 3572 | ocfs2_mark_lockres_freeing(osb, lockres); |
0d5dc6c2 | 3573 | ret = ocfs2_drop_lock(osb, lockres); |
d680efe9 MF |
3574 | if (ret) |
3575 | mlog_errno(ret); | |
3576 | } | |
ccd979bd | 3577 | |
d680efe9 MF |
3578 | static void ocfs2_drop_osb_locks(struct ocfs2_super *osb) |
3579 | { | |
3580 | ocfs2_simple_drop_lockres(osb, &osb->osb_super_lockres); | |
3581 | ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres); | |
6ca497a8 | 3582 | ocfs2_simple_drop_lockres(osb, &osb->osb_nfs_sync_lockres); |
83273932 | 3583 | ocfs2_simple_drop_lockres(osb, &osb->osb_orphan_scan.os_lockres); |
ccd979bd MF |
3584 | } |
3585 | ||
ccd979bd MF |
3586 | int ocfs2_drop_inode_locks(struct inode *inode) |
3587 | { | |
3588 | int status, err; | |
ccd979bd | 3589 | |
ccd979bd MF |
3590 | /* No need to call ocfs2_mark_lockres_freeing here - |
3591 | * ocfs2_clear_inode has done it for us. */ | |
3592 | ||
3593 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
50008630 | 3594 | &OCFS2_I(inode)->ip_open_lockres); |
ccd979bd MF |
3595 | if (err < 0) |
3596 | mlog_errno(err); | |
3597 | ||
3598 | status = err; | |
3599 | ||
3600 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
e63aecb6 | 3601 | &OCFS2_I(inode)->ip_inode_lockres); |
ccd979bd MF |
3602 | if (err < 0) |
3603 | mlog_errno(err); | |
3604 | if (err < 0 && !status) | |
3605 | status = err; | |
3606 | ||
3607 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
0d5dc6c2 | 3608 | &OCFS2_I(inode)->ip_rw_lockres); |
ccd979bd MF |
3609 | if (err < 0) |
3610 | mlog_errno(err); | |
3611 | if (err < 0 && !status) | |
3612 | status = err; | |
3613 | ||
ccd979bd MF |
3614 | return status; |
3615 | } | |
3616 | ||
de551246 JB |
3617 | static unsigned int ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres, |
3618 | int new_level) | |
ccd979bd MF |
3619 | { |
3620 | assert_spin_locked(&lockres->l_lock); | |
3621 | ||
bd3e7610 | 3622 | BUG_ON(lockres->l_blocking <= DLM_LOCK_NL); |
ccd979bd MF |
3623 | |
3624 | if (lockres->l_level <= new_level) { | |
9b915181 SM |
3625 | mlog(ML_ERROR, "lockres %s, lvl %d <= %d, blcklst %d, mask %d, " |
3626 | "type %d, flags 0x%lx, hold %d %d, act %d %d, req %d, " | |
3627 | "block %d, pgen %d\n", lockres->l_name, lockres->l_level, | |
3628 | new_level, list_empty(&lockres->l_blocked_list), | |
3629 | list_empty(&lockres->l_mask_waiters), lockres->l_type, | |
3630 | lockres->l_flags, lockres->l_ro_holders, | |
3631 | lockres->l_ex_holders, lockres->l_action, | |
3632 | lockres->l_unlock_action, lockres->l_requested, | |
3633 | lockres->l_blocking, lockres->l_pending_gen); | |
ccd979bd MF |
3634 | BUG(); |
3635 | } | |
3636 | ||
9b915181 SM |
3637 | mlog(ML_BASTS, "lockres %s, level %d => %d, blocking %d\n", |
3638 | lockres->l_name, lockres->l_level, new_level, lockres->l_blocking); | |
ccd979bd MF |
3639 | |
3640 | lockres->l_action = OCFS2_AST_DOWNCONVERT; | |
3641 | lockres->l_requested = new_level; | |
3642 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
de551246 | 3643 | return lockres_set_pending(lockres); |
ccd979bd MF |
3644 | } |
3645 | ||
3646 | static int ocfs2_downconvert_lock(struct ocfs2_super *osb, | |
3647 | struct ocfs2_lock_res *lockres, | |
3648 | int new_level, | |
de551246 JB |
3649 | int lvb, |
3650 | unsigned int generation) | |
ccd979bd | 3651 | { |
bd3e7610 JB |
3652 | int ret; |
3653 | u32 dlm_flags = DLM_LKF_CONVERT; | |
ccd979bd | 3654 | |
9b915181 SM |
3655 | mlog(ML_BASTS, "lockres %s, level %d => %d\n", lockres->l_name, |
3656 | lockres->l_level, new_level); | |
3657 | ||
e7ee2c08 ER |
3658 | /* |
3659 | * On DLM_LKF_VALBLK, fsdlm behaves differently with o2cb. It always | |
3660 | * expects DLM_LKF_VALBLK being set if the LKB has LVB, so that | |
3661 | * we can recover correctly from node failure. Otherwise, we may get | |
793057e1 | 3662 | * invalid LVB in LKB, but without DLM_SBF_VALNOTVALID being set. |
e7ee2c08 | 3663 | */ |
a6346447 | 3664 | if (ocfs2_userspace_stack(osb) && |
e7ee2c08 ER |
3665 | lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
3666 | lvb = 1; | |
3667 | ||
ccd979bd | 3668 | if (lvb) |
bd3e7610 | 3669 | dlm_flags |= DLM_LKF_VALBLK; |
ccd979bd | 3670 | |
4670c46d | 3671 | ret = ocfs2_dlm_lock(osb->cconn, |
7431cd7e JB |
3672 | new_level, |
3673 | &lockres->l_lksb, | |
3674 | dlm_flags, | |
3675 | lockres->l_name, | |
a796d286 | 3676 | OCFS2_LOCK_ID_MAX_LEN - 1); |
de551246 | 3677 | lockres_clear_pending(lockres, generation, osb); |
7431cd7e JB |
3678 | if (ret) { |
3679 | ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres); | |
ccd979bd MF |
3680 | ocfs2_recover_from_dlm_error(lockres, 1); |
3681 | goto bail; | |
3682 | } | |
3683 | ||
3684 | ret = 0; | |
3685 | bail: | |
ccd979bd MF |
3686 | return ret; |
3687 | } | |
3688 | ||
24ef1815 | 3689 | /* returns 1 when the caller should unlock and call ocfs2_dlm_unlock */ |
ccd979bd MF |
3690 | static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb, |
3691 | struct ocfs2_lock_res *lockres) | |
3692 | { | |
3693 | assert_spin_locked(&lockres->l_lock); | |
3694 | ||
ccd979bd MF |
3695 | if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { |
3696 | /* If we're already trying to cancel a lock conversion | |
3697 | * then just drop the spinlock and allow the caller to | |
3698 | * requeue this lock. */ | |
9b915181 | 3699 | mlog(ML_BASTS, "lockres %s, skip convert\n", lockres->l_name); |
ccd979bd MF |
3700 | return 0; |
3701 | } | |
3702 | ||
3703 | /* were we in a convert when we got the bast fire? */ | |
3704 | BUG_ON(lockres->l_action != OCFS2_AST_CONVERT && | |
3705 | lockres->l_action != OCFS2_AST_DOWNCONVERT); | |
3706 | /* set things up for the unlockast to know to just | |
3707 | * clear out the ast_action and unset busy, etc. */ | |
3708 | lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT; | |
3709 | ||
3710 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY), | |
3711 | "lock %s, invalid flags: 0x%lx\n", | |
3712 | lockres->l_name, lockres->l_flags); | |
3713 | ||
9b915181 SM |
3714 | mlog(ML_BASTS, "lockres %s\n", lockres->l_name); |
3715 | ||
ccd979bd MF |
3716 | return 1; |
3717 | } | |
3718 | ||
3719 | static int ocfs2_cancel_convert(struct ocfs2_super *osb, | |
3720 | struct ocfs2_lock_res *lockres) | |
3721 | { | |
3722 | int ret; | |
ccd979bd | 3723 | |
4670c46d | 3724 | ret = ocfs2_dlm_unlock(osb->cconn, &lockres->l_lksb, |
a796d286 | 3725 | DLM_LKF_CANCEL); |
7431cd7e JB |
3726 | if (ret) { |
3727 | ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres); | |
ccd979bd MF |
3728 | ocfs2_recover_from_dlm_error(lockres, 0); |
3729 | } | |
3730 | ||
9b915181 | 3731 | mlog(ML_BASTS, "lockres %s\n", lockres->l_name); |
ccd979bd | 3732 | |
ccd979bd MF |
3733 | return ret; |
3734 | } | |
3735 | ||
b5e500e2 MF |
3736 | static int ocfs2_unblock_lock(struct ocfs2_super *osb, |
3737 | struct ocfs2_lock_res *lockres, | |
3738 | struct ocfs2_unblock_ctl *ctl) | |
ccd979bd MF |
3739 | { |
3740 | unsigned long flags; | |
3741 | int blocking; | |
3742 | int new_level; | |
079b8057 | 3743 | int level; |
ccd979bd | 3744 | int ret = 0; |
5ef0d4ea | 3745 | int set_lvb = 0; |
de551246 | 3746 | unsigned int gen; |
ccd979bd | 3747 | |
ccd979bd MF |
3748 | spin_lock_irqsave(&lockres->l_lock, flags); |
3749 | ||
ccd979bd | 3750 | recheck: |
db0f6ce6 SM |
3751 | /* |
3752 | * Is it still blocking? If not, we have no more work to do. | |
3753 | */ | |
3754 | if (!(lockres->l_flags & OCFS2_LOCK_BLOCKED)) { | |
3755 | BUG_ON(lockres->l_blocking != DLM_LOCK_NL); | |
3756 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3757 | ret = 0; | |
3758 | goto leave; | |
3759 | } | |
3760 | ||
ccd979bd | 3761 | if (lockres->l_flags & OCFS2_LOCK_BUSY) { |
de551246 JB |
3762 | /* XXX |
3763 | * This is a *big* race. The OCFS2_LOCK_PENDING flag | |
3764 | * exists entirely for one reason - another thread has set | |
3765 | * OCFS2_LOCK_BUSY, but has *NOT* yet called dlm_lock(). | |
3766 | * | |
3767 | * If we do ocfs2_cancel_convert() before the other thread | |
3768 | * calls dlm_lock(), our cancel will do nothing. We will | |
3769 | * get no ast, and we will have no way of knowing the | |
3770 | * cancel failed. Meanwhile, the other thread will call | |
3771 | * into dlm_lock() and wait...forever. | |
3772 | * | |
3773 | * Why forever? Because another node has asked for the | |
3774 | * lock first; that's why we're here in unblock_lock(). | |
3775 | * | |
3776 | * The solution is OCFS2_LOCK_PENDING. When PENDING is | |
3777 | * set, we just requeue the unblock. Only when the other | |
3778 | * thread has called dlm_lock() and cleared PENDING will | |
3779 | * we then cancel their request. | |
3780 | * | |
3781 | * All callers of dlm_lock() must set OCFS2_DLM_PENDING | |
3782 | * at the same time they set OCFS2_DLM_BUSY. They must | |
3783 | * clear OCFS2_DLM_PENDING after dlm_lock() returns. | |
3784 | */ | |
9b915181 SM |
3785 | if (lockres->l_flags & OCFS2_LOCK_PENDING) { |
3786 | mlog(ML_BASTS, "lockres %s, ReQ: Pending\n", | |
3787 | lockres->l_name); | |
de551246 | 3788 | goto leave_requeue; |
9b915181 | 3789 | } |
de551246 | 3790 | |
d680efe9 | 3791 | ctl->requeue = 1; |
ccd979bd MF |
3792 | ret = ocfs2_prepare_cancel_convert(osb, lockres); |
3793 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3794 | if (ret) { | |
3795 | ret = ocfs2_cancel_convert(osb, lockres); | |
3796 | if (ret < 0) | |
3797 | mlog_errno(ret); | |
3798 | } | |
3799 | goto leave; | |
3800 | } | |
3801 | ||
a1912826 SM |
3802 | /* |
3803 | * This prevents livelocks. OCFS2_LOCK_UPCONVERT_FINISHING flag is | |
3804 | * set when the ast is received for an upconvert just before the | |
3805 | * OCFS2_LOCK_BUSY flag is cleared. Now if the fs received a bast | |
3806 | * on the heels of the ast, we want to delay the downconvert just | |
3807 | * enough to allow the up requestor to do its task. Because this | |
3808 | * lock is in the blocked queue, the lock will be downconverted | |
3809 | * as soon as the requestor is done with the lock. | |
3810 | */ | |
3811 | if (lockres->l_flags & OCFS2_LOCK_UPCONVERT_FINISHING) | |
3812 | goto leave_requeue; | |
3813 | ||
0d74125a SM |
3814 | /* |
3815 | * How can we block and yet be at NL? We were trying to upconvert | |
3816 | * from NL and got canceled. The code comes back here, and now | |
3817 | * we notice and clear BLOCKING. | |
3818 | */ | |
3819 | if (lockres->l_level == DLM_LOCK_NL) { | |
3820 | BUG_ON(lockres->l_ex_holders || lockres->l_ro_holders); | |
9b915181 | 3821 | mlog(ML_BASTS, "lockres %s, Aborting dc\n", lockres->l_name); |
0d74125a SM |
3822 | lockres->l_blocking = DLM_LOCK_NL; |
3823 | lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED); | |
3824 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3825 | goto leave; | |
3826 | } | |
3827 | ||
ccd979bd MF |
3828 | /* if we're blocking an exclusive and we have *any* holders, |
3829 | * then requeue. */ | |
bd3e7610 | 3830 | if ((lockres->l_blocking == DLM_LOCK_EX) |
9b915181 SM |
3831 | && (lockres->l_ex_holders || lockres->l_ro_holders)) { |
3832 | mlog(ML_BASTS, "lockres %s, ReQ: EX/PR Holders %u,%u\n", | |
3833 | lockres->l_name, lockres->l_ex_holders, | |
3834 | lockres->l_ro_holders); | |
f7fbfdd1 | 3835 | goto leave_requeue; |
9b915181 | 3836 | } |
ccd979bd MF |
3837 | |
3838 | /* If it's a PR we're blocking, then only | |
3839 | * requeue if we've got any EX holders */ | |
bd3e7610 | 3840 | if (lockres->l_blocking == DLM_LOCK_PR && |
9b915181 SM |
3841 | lockres->l_ex_holders) { |
3842 | mlog(ML_BASTS, "lockres %s, ReQ: EX Holders %u\n", | |
3843 | lockres->l_name, lockres->l_ex_holders); | |
f7fbfdd1 | 3844 | goto leave_requeue; |
9b915181 | 3845 | } |
f7fbfdd1 MF |
3846 | |
3847 | /* | |
3848 | * Can we get a lock in this state if the holder counts are | |
3849 | * zero? The meta data unblock code used to check this. | |
3850 | */ | |
3851 | if ((lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) | |
9b915181 SM |
3852 | && (lockres->l_flags & OCFS2_LOCK_REFRESHING)) { |
3853 | mlog(ML_BASTS, "lockres %s, ReQ: Lock Refreshing\n", | |
3854 | lockres->l_name); | |
f7fbfdd1 | 3855 | goto leave_requeue; |
9b915181 | 3856 | } |
ccd979bd | 3857 | |
16d5b956 MF |
3858 | new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking); |
3859 | ||
3860 | if (lockres->l_ops->check_downconvert | |
9b915181 SM |
3861 | && !lockres->l_ops->check_downconvert(lockres, new_level)) { |
3862 | mlog(ML_BASTS, "lockres %s, ReQ: Checkpointing\n", | |
3863 | lockres->l_name); | |
16d5b956 | 3864 | goto leave_requeue; |
9b915181 | 3865 | } |
16d5b956 | 3866 | |
ccd979bd MF |
3867 | /* If we get here, then we know that there are no more |
3868 | * incompatible holders (and anyone asking for an incompatible | |
3869 | * lock is blocked). We can now downconvert the lock */ | |
cc567d89 | 3870 | if (!lockres->l_ops->downconvert_worker) |
ccd979bd MF |
3871 | goto downconvert; |
3872 | ||
3873 | /* Some lockres types want to do a bit of work before | |
3874 | * downconverting a lock. Allow that here. The worker function | |
3875 | * may sleep, so we save off a copy of what we're blocking as | |
3876 | * it may change while we're not holding the spin lock. */ | |
3877 | blocking = lockres->l_blocking; | |
079b8057 | 3878 | level = lockres->l_level; |
ccd979bd MF |
3879 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
3880 | ||
cc567d89 | 3881 | ctl->unblock_action = lockres->l_ops->downconvert_worker(lockres, blocking); |
d680efe9 | 3882 | |
9b915181 SM |
3883 | if (ctl->unblock_action == UNBLOCK_STOP_POST) { |
3884 | mlog(ML_BASTS, "lockres %s, UNBLOCK_STOP_POST\n", | |
3885 | lockres->l_name); | |
d680efe9 | 3886 | goto leave; |
9b915181 | 3887 | } |
ccd979bd MF |
3888 | |
3889 | spin_lock_irqsave(&lockres->l_lock, flags); | |
079b8057 | 3890 | if ((blocking != lockres->l_blocking) || (level != lockres->l_level)) { |
ccd979bd MF |
3891 | /* If this changed underneath us, then we can't drop |
3892 | * it just yet. */ | |
9b915181 SM |
3893 | mlog(ML_BASTS, "lockres %s, block=%d:%d, level=%d:%d, " |
3894 | "Recheck\n", lockres->l_name, blocking, | |
3895 | lockres->l_blocking, level, lockres->l_level); | |
ccd979bd MF |
3896 | goto recheck; |
3897 | } | |
3898 | ||
3899 | downconvert: | |
d680efe9 | 3900 | ctl->requeue = 0; |
ccd979bd | 3901 | |
5ef0d4ea | 3902 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) { |
bd3e7610 | 3903 | if (lockres->l_level == DLM_LOCK_EX) |
5ef0d4ea MF |
3904 | set_lvb = 1; |
3905 | ||
3906 | /* | |
3907 | * We only set the lvb if the lock has been fully | |
3908 | * refreshed - otherwise we risk setting stale | |
3909 | * data. Otherwise, there's no need to actually clear | |
3910 | * out the lvb here as it's value is still valid. | |
3911 | */ | |
3912 | if (set_lvb && !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) | |
3913 | lockres->l_ops->set_lvb(lockres); | |
3914 | } | |
3915 | ||
de551246 | 3916 | gen = ocfs2_prepare_downconvert(lockres, new_level); |
ccd979bd | 3917 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
de551246 JB |
3918 | ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb, |
3919 | gen); | |
9673e005 GH |
3920 | /* The dlm lock convert is being cancelled in background, |
3921 | * ocfs2_cancel_convert() is asynchronous in fs/dlm, | |
3922 | * requeue it, try again later. | |
3923 | */ | |
3924 | if (ret == -EBUSY) { | |
3925 | ctl->requeue = 1; | |
3926 | mlog(ML_BASTS, "lockres %s, ReQ: Downconvert busy\n", | |
3927 | lockres->l_name); | |
3928 | ret = 0; | |
3929 | msleep(20); | |
3930 | } | |
de551246 | 3931 | |
ccd979bd | 3932 | leave: |
c1e8d35e TM |
3933 | if (ret) |
3934 | mlog_errno(ret); | |
ccd979bd | 3935 | return ret; |
f7fbfdd1 MF |
3936 | |
3937 | leave_requeue: | |
3938 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3939 | ctl->requeue = 1; | |
3940 | ||
f7fbfdd1 | 3941 | return 0; |
ccd979bd MF |
3942 | } |
3943 | ||
d680efe9 MF |
3944 | static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, |
3945 | int blocking) | |
ccd979bd MF |
3946 | { |
3947 | struct inode *inode; | |
3948 | struct address_space *mapping; | |
5e98d492 | 3949 | struct ocfs2_inode_info *oi; |
ccd979bd | 3950 | |
ccd979bd MF |
3951 | inode = ocfs2_lock_res_inode(lockres); |
3952 | mapping = inode->i_mapping; | |
3953 | ||
5e98d492 GR |
3954 | if (S_ISDIR(inode->i_mode)) { |
3955 | oi = OCFS2_I(inode); | |
3956 | oi->ip_dir_lock_gen++; | |
3957 | mlog(0, "generation: %u\n", oi->ip_dir_lock_gen); | |
9c0f0a03 | 3958 | goto out_forget; |
5e98d492 GR |
3959 | } |
3960 | ||
1044e401 | 3961 | if (!S_ISREG(inode->i_mode)) |
f1f54068 MF |
3962 | goto out; |
3963 | ||
7f4a2a97 MF |
3964 | /* |
3965 | * We need this before the filemap_fdatawrite() so that it can | |
3966 | * transfer the dirty bit from the PTE to the | |
3967 | * page. Unfortunately this means that even for EX->PR | |
3968 | * downconverts, we'll lose our mappings and have to build | |
3969 | * them up again. | |
3970 | */ | |
3971 | unmap_mapping_range(mapping, 0, 0, 0); | |
3972 | ||
ccd979bd | 3973 | if (filemap_fdatawrite(mapping)) { |
b0697053 MF |
3974 | mlog(ML_ERROR, "Could not sync inode %llu for downconvert!", |
3975 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
ccd979bd MF |
3976 | } |
3977 | sync_mapping_buffers(mapping); | |
bd3e7610 | 3978 | if (blocking == DLM_LOCK_EX) { |
ccd979bd | 3979 | truncate_inode_pages(mapping, 0); |
ccd979bd MF |
3980 | } else { |
3981 | /* We only need to wait on the I/O if we're not also | |
3982 | * truncating pages because truncate_inode_pages waits | |
3983 | * for us above. We don't truncate pages if we're | |
3984 | * blocking anything < EXMODE because we want to keep | |
3985 | * them around in that case. */ | |
3986 | filemap_fdatawait(mapping); | |
3987 | } | |
3988 | ||
9c0f0a03 | 3989 | out_forget: |
b8a7a3a6 AG |
3990 | forget_all_cached_acls(inode); |
3991 | ||
f1f54068 | 3992 | out: |
d680efe9 | 3993 | return UNBLOCK_CONTINUE; |
ccd979bd MF |
3994 | } |
3995 | ||
a4338481 TM |
3996 | static int ocfs2_ci_checkpointed(struct ocfs2_caching_info *ci, |
3997 | struct ocfs2_lock_res *lockres, | |
3998 | int new_level) | |
810d5aeb | 3999 | { |
a4338481 | 4000 | int checkpointed = ocfs2_ci_fully_checkpointed(ci); |
810d5aeb | 4001 | |
bd3e7610 JB |
4002 | BUG_ON(new_level != DLM_LOCK_NL && new_level != DLM_LOCK_PR); |
4003 | BUG_ON(lockres->l_level != DLM_LOCK_EX && !checkpointed); | |
810d5aeb MF |
4004 | |
4005 | if (checkpointed) | |
4006 | return 1; | |
4007 | ||
a4338481 | 4008 | ocfs2_start_checkpoint(OCFS2_SB(ocfs2_metadata_cache_get_super(ci))); |
810d5aeb MF |
4009 | return 0; |
4010 | } | |
4011 | ||
a4338481 TM |
4012 | static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres, |
4013 | int new_level) | |
4014 | { | |
4015 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
4016 | ||
4017 | return ocfs2_ci_checkpointed(INODE_CACHE(inode), lockres, new_level); | |
4018 | } | |
4019 | ||
810d5aeb MF |
4020 | static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres) |
4021 | { | |
4022 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
4023 | ||
4024 | __ocfs2_stuff_meta_lvb(inode); | |
4025 | } | |
4026 | ||
d680efe9 MF |
4027 | /* |
4028 | * Does the final reference drop on our dentry lock. Right now this | |
34d024f8 | 4029 | * happens in the downconvert thread, but we could choose to simplify the |
d680efe9 MF |
4030 | * dlmglue API and push these off to the ocfs2_wq in the future. |
4031 | */ | |
4032 | static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, | |
4033 | struct ocfs2_lock_res *lockres) | |
4034 | { | |
4035 | struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); | |
4036 | ocfs2_dentry_lock_put(osb, dl); | |
4037 | } | |
4038 | ||
4039 | /* | |
4040 | * d_delete() matching dentries before the lock downconvert. | |
4041 | * | |
4042 | * At this point, any process waiting to destroy the | |
4043 | * dentry_lock due to last ref count is stopped by the | |
4044 | * OCFS2_LOCK_QUEUED flag. | |
4045 | * | |
4046 | * We have two potential problems | |
4047 | * | |
4048 | * 1) If we do the last reference drop on our dentry_lock (via dput) | |
4049 | * we'll wind up in ocfs2_release_dentry_lock(), waiting on | |
4050 | * the downconvert to finish. Instead we take an elevated | |
4051 | * reference and push the drop until after we've completed our | |
4052 | * unblock processing. | |
4053 | * | |
4054 | * 2) There might be another process with a final reference, | |
4055 | * waiting on us to finish processing. If this is the case, we | |
4056 | * detect it and exit out - there's no more dentries anyway. | |
4057 | */ | |
4058 | static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, | |
4059 | int blocking) | |
4060 | { | |
4061 | struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); | |
4062 | struct ocfs2_inode_info *oi = OCFS2_I(dl->dl_inode); | |
4063 | struct dentry *dentry; | |
4064 | unsigned long flags; | |
4065 | int extra_ref = 0; | |
4066 | ||
4067 | /* | |
4068 | * This node is blocking another node from getting a read | |
4069 | * lock. This happens when we've renamed within a | |
4070 | * directory. We've forced the other nodes to d_delete(), but | |
4071 | * we never actually dropped our lock because it's still | |
4072 | * valid. The downconvert code will retain a PR for this node, | |
4073 | * so there's no further work to do. | |
4074 | */ | |
bd3e7610 | 4075 | if (blocking == DLM_LOCK_PR) |
d680efe9 MF |
4076 | return UNBLOCK_CONTINUE; |
4077 | ||
4078 | /* | |
4079 | * Mark this inode as potentially orphaned. The code in | |
4080 | * ocfs2_delete_inode() will figure out whether it actually | |
4081 | * needs to be freed or not. | |
4082 | */ | |
4083 | spin_lock(&oi->ip_lock); | |
4084 | oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED; | |
4085 | spin_unlock(&oi->ip_lock); | |
4086 | ||
4087 | /* | |
4088 | * Yuck. We need to make sure however that the check of | |
4089 | * OCFS2_LOCK_FREEING and the extra reference are atomic with | |
4090 | * respect to a reference decrement or the setting of that | |
4091 | * flag. | |
4092 | */ | |
4093 | spin_lock_irqsave(&lockres->l_lock, flags); | |
4094 | spin_lock(&dentry_attach_lock); | |
4095 | if (!(lockres->l_flags & OCFS2_LOCK_FREEING) | |
4096 | && dl->dl_count) { | |
4097 | dl->dl_count++; | |
4098 | extra_ref = 1; | |
4099 | } | |
4100 | spin_unlock(&dentry_attach_lock); | |
4101 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
4102 | ||
4103 | mlog(0, "extra_ref = %d\n", extra_ref); | |
4104 | ||
4105 | /* | |
4106 | * We have a process waiting on us in ocfs2_dentry_iput(), | |
4107 | * which means we can't have any more outstanding | |
4108 | * aliases. There's no need to do any more work. | |
4109 | */ | |
4110 | if (!extra_ref) | |
4111 | return UNBLOCK_CONTINUE; | |
4112 | ||
4113 | spin_lock(&dentry_attach_lock); | |
4114 | while (1) { | |
4115 | dentry = ocfs2_find_local_alias(dl->dl_inode, | |
4116 | dl->dl_parent_blkno, 1); | |
4117 | if (!dentry) | |
4118 | break; | |
4119 | spin_unlock(&dentry_attach_lock); | |
4120 | ||
10ab8811 | 4121 | if (S_ISDIR(dl->dl_inode->i_mode)) |
4122 | shrink_dcache_parent(dentry); | |
4123 | ||
a455589f | 4124 | mlog(0, "d_delete(%pd);\n", dentry); |
d680efe9 MF |
4125 | |
4126 | /* | |
4127 | * The following dcache calls may do an | |
4128 | * iput(). Normally we don't want that from the | |
4129 | * downconverting thread, but in this case it's ok | |
4130 | * because the requesting node already has an | |
4131 | * exclusive lock on the inode, so it can't be queued | |
4132 | * for a downconvert. | |
4133 | */ | |
4134 | d_delete(dentry); | |
4135 | dput(dentry); | |
4136 | ||
4137 | spin_lock(&dentry_attach_lock); | |
4138 | } | |
4139 | spin_unlock(&dentry_attach_lock); | |
4140 | ||
4141 | /* | |
4142 | * If we are the last holder of this dentry lock, there is no | |
4143 | * reason to downconvert so skip straight to the unlock. | |
4144 | */ | |
4145 | if (dl->dl_count == 1) | |
4146 | return UNBLOCK_STOP_POST; | |
4147 | ||
4148 | return UNBLOCK_CONTINUE_POST; | |
4149 | } | |
4150 | ||
8dec98ed TM |
4151 | static int ocfs2_check_refcount_downconvert(struct ocfs2_lock_res *lockres, |
4152 | int new_level) | |
4153 | { | |
4154 | struct ocfs2_refcount_tree *tree = | |
4155 | ocfs2_lock_res_refcount_tree(lockres); | |
4156 | ||
4157 | return ocfs2_ci_checkpointed(&tree->rf_ci, lockres, new_level); | |
4158 | } | |
4159 | ||
4160 | static int ocfs2_refcount_convert_worker(struct ocfs2_lock_res *lockres, | |
4161 | int blocking) | |
4162 | { | |
4163 | struct ocfs2_refcount_tree *tree = | |
4164 | ocfs2_lock_res_refcount_tree(lockres); | |
4165 | ||
4166 | ocfs2_metadata_cache_purge(&tree->rf_ci); | |
4167 | ||
4168 | return UNBLOCK_CONTINUE; | |
4169 | } | |
4170 | ||
9e33d69f JK |
4171 | static void ocfs2_set_qinfo_lvb(struct ocfs2_lock_res *lockres) |
4172 | { | |
4173 | struct ocfs2_qinfo_lvb *lvb; | |
4174 | struct ocfs2_mem_dqinfo *oinfo = ocfs2_lock_res_qinfo(lockres); | |
4175 | struct mem_dqinfo *info = sb_dqinfo(oinfo->dqi_gi.dqi_sb, | |
4176 | oinfo->dqi_gi.dqi_type); | |
4177 | ||
a641dc2a | 4178 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
9e33d69f JK |
4179 | lvb->lvb_version = OCFS2_QINFO_LVB_VERSION; |
4180 | lvb->lvb_bgrace = cpu_to_be32(info->dqi_bgrace); | |
4181 | lvb->lvb_igrace = cpu_to_be32(info->dqi_igrace); | |
4182 | lvb->lvb_syncms = cpu_to_be32(oinfo->dqi_syncms); | |
4183 | lvb->lvb_blocks = cpu_to_be32(oinfo->dqi_gi.dqi_blocks); | |
4184 | lvb->lvb_free_blk = cpu_to_be32(oinfo->dqi_gi.dqi_free_blk); | |
4185 | lvb->lvb_free_entry = cpu_to_be32(oinfo->dqi_gi.dqi_free_entry); | |
9e33d69f JK |
4186 | } |
4187 | ||
4188 | void ocfs2_qinfo_unlock(struct ocfs2_mem_dqinfo *oinfo, int ex) | |
4189 | { | |
4190 | struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock; | |
4191 | struct ocfs2_super *osb = OCFS2_SB(oinfo->dqi_gi.dqi_sb); | |
4192 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; | |
4193 | ||
9e33d69f JK |
4194 | if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb)) |
4195 | ocfs2_cluster_unlock(osb, lockres, level); | |
9e33d69f JK |
4196 | } |
4197 | ||
4198 | static int ocfs2_refresh_qinfo(struct ocfs2_mem_dqinfo *oinfo) | |
4199 | { | |
4200 | struct mem_dqinfo *info = sb_dqinfo(oinfo->dqi_gi.dqi_sb, | |
4201 | oinfo->dqi_gi.dqi_type); | |
4202 | struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock; | |
4203 | struct ocfs2_qinfo_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
85eb8b73 | 4204 | struct buffer_head *bh = NULL; |
9e33d69f JK |
4205 | struct ocfs2_global_disk_dqinfo *gdinfo; |
4206 | int status = 0; | |
4207 | ||
1c520dfb JB |
4208 | if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) && |
4209 | lvb->lvb_version == OCFS2_QINFO_LVB_VERSION) { | |
9e33d69f JK |
4210 | info->dqi_bgrace = be32_to_cpu(lvb->lvb_bgrace); |
4211 | info->dqi_igrace = be32_to_cpu(lvb->lvb_igrace); | |
4212 | oinfo->dqi_syncms = be32_to_cpu(lvb->lvb_syncms); | |
4213 | oinfo->dqi_gi.dqi_blocks = be32_to_cpu(lvb->lvb_blocks); | |
4214 | oinfo->dqi_gi.dqi_free_blk = be32_to_cpu(lvb->lvb_free_blk); | |
4215 | oinfo->dqi_gi.dqi_free_entry = | |
4216 | be32_to_cpu(lvb->lvb_free_entry); | |
4217 | } else { | |
ae4f6ef1 JK |
4218 | status = ocfs2_read_quota_phys_block(oinfo->dqi_gqinode, |
4219 | oinfo->dqi_giblk, &bh); | |
85eb8b73 | 4220 | if (status) { |
9e33d69f JK |
4221 | mlog_errno(status); |
4222 | goto bail; | |
4223 | } | |
4224 | gdinfo = (struct ocfs2_global_disk_dqinfo *) | |
4225 | (bh->b_data + OCFS2_GLOBAL_INFO_OFF); | |
4226 | info->dqi_bgrace = le32_to_cpu(gdinfo->dqi_bgrace); | |
4227 | info->dqi_igrace = le32_to_cpu(gdinfo->dqi_igrace); | |
4228 | oinfo->dqi_syncms = le32_to_cpu(gdinfo->dqi_syncms); | |
4229 | oinfo->dqi_gi.dqi_blocks = le32_to_cpu(gdinfo->dqi_blocks); | |
4230 | oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(gdinfo->dqi_free_blk); | |
4231 | oinfo->dqi_gi.dqi_free_entry = | |
4232 | le32_to_cpu(gdinfo->dqi_free_entry); | |
4233 | brelse(bh); | |
4234 | ocfs2_track_lock_refresh(lockres); | |
4235 | } | |
4236 | ||
4237 | bail: | |
4238 | return status; | |
4239 | } | |
4240 | ||
4241 | /* Lock quota info, this function expects at least shared lock on the quota file | |
4242 | * so that we can safely refresh quota info from disk. */ | |
4243 | int ocfs2_qinfo_lock(struct ocfs2_mem_dqinfo *oinfo, int ex) | |
4244 | { | |
4245 | struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock; | |
4246 | struct ocfs2_super *osb = OCFS2_SB(oinfo->dqi_gi.dqi_sb); | |
4247 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; | |
4248 | int status = 0; | |
4249 | ||
9e33d69f JK |
4250 | /* On RO devices, locking really isn't needed... */ |
4251 | if (ocfs2_is_hard_readonly(osb)) { | |
4252 | if (ex) | |
4253 | status = -EROFS; | |
4254 | goto bail; | |
4255 | } | |
4256 | if (ocfs2_mount_local(osb)) | |
4257 | goto bail; | |
4258 | ||
4259 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); | |
4260 | if (status < 0) { | |
4261 | mlog_errno(status); | |
4262 | goto bail; | |
4263 | } | |
4264 | if (!ocfs2_should_refresh_lock_res(lockres)) | |
4265 | goto bail; | |
4266 | /* OK, we have the lock but we need to refresh the quota info */ | |
4267 | status = ocfs2_refresh_qinfo(oinfo); | |
4268 | if (status) | |
4269 | ocfs2_qinfo_unlock(oinfo, ex); | |
4270 | ocfs2_complete_lock_res_refresh(lockres, status); | |
4271 | bail: | |
9e33d69f JK |
4272 | return status; |
4273 | } | |
4274 | ||
8dec98ed TM |
4275 | int ocfs2_refcount_lock(struct ocfs2_refcount_tree *ref_tree, int ex) |
4276 | { | |
4277 | int status; | |
4278 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; | |
4279 | struct ocfs2_lock_res *lockres = &ref_tree->rf_lockres; | |
4280 | struct ocfs2_super *osb = lockres->l_priv; | |
4281 | ||
4282 | ||
4283 | if (ocfs2_is_hard_readonly(osb)) | |
4284 | return -EROFS; | |
4285 | ||
4286 | if (ocfs2_mount_local(osb)) | |
4287 | return 0; | |
4288 | ||
4289 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); | |
4290 | if (status < 0) | |
4291 | mlog_errno(status); | |
4292 | ||
4293 | return status; | |
4294 | } | |
4295 | ||
4296 | void ocfs2_refcount_unlock(struct ocfs2_refcount_tree *ref_tree, int ex) | |
4297 | { | |
4298 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; | |
4299 | struct ocfs2_lock_res *lockres = &ref_tree->rf_lockres; | |
4300 | struct ocfs2_super *osb = lockres->l_priv; | |
4301 | ||
4302 | if (!ocfs2_mount_local(osb)) | |
4303 | ocfs2_cluster_unlock(osb, lockres, level); | |
4304 | } | |
4305 | ||
00600056 AB |
4306 | static void ocfs2_process_blocked_lock(struct ocfs2_super *osb, |
4307 | struct ocfs2_lock_res *lockres) | |
ccd979bd MF |
4308 | { |
4309 | int status; | |
d680efe9 | 4310 | struct ocfs2_unblock_ctl ctl = {0, 0,}; |
ccd979bd MF |
4311 | unsigned long flags; |
4312 | ||
4313 | /* Our reference to the lockres in this function can be | |
4314 | * considered valid until we remove the OCFS2_LOCK_QUEUED | |
4315 | * flag. */ | |
4316 | ||
ccd979bd MF |
4317 | BUG_ON(!lockres); |
4318 | BUG_ON(!lockres->l_ops); | |
ccd979bd | 4319 | |
9b915181 | 4320 | mlog(ML_BASTS, "lockres %s blocked\n", lockres->l_name); |
ccd979bd MF |
4321 | |
4322 | /* Detect whether a lock has been marked as going away while | |
34d024f8 | 4323 | * the downconvert thread was processing other things. A lock can |
ccd979bd MF |
4324 | * still be marked with OCFS2_LOCK_FREEING after this check, |
4325 | * but short circuiting here will still save us some | |
4326 | * performance. */ | |
4327 | spin_lock_irqsave(&lockres->l_lock, flags); | |
4328 | if (lockres->l_flags & OCFS2_LOCK_FREEING) | |
4329 | goto unqueue; | |
4330 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
4331 | ||
b5e500e2 | 4332 | status = ocfs2_unblock_lock(osb, lockres, &ctl); |
ccd979bd MF |
4333 | if (status < 0) |
4334 | mlog_errno(status); | |
4335 | ||
4336 | spin_lock_irqsave(&lockres->l_lock, flags); | |
4337 | unqueue: | |
d680efe9 | 4338 | if (lockres->l_flags & OCFS2_LOCK_FREEING || !ctl.requeue) { |
ccd979bd MF |
4339 | lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED); |
4340 | } else | |
4341 | ocfs2_schedule_blocked_lock(osb, lockres); | |
4342 | ||
9b915181 | 4343 | mlog(ML_BASTS, "lockres %s, requeue = %s.\n", lockres->l_name, |
d680efe9 | 4344 | ctl.requeue ? "yes" : "no"); |
ccd979bd MF |
4345 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
4346 | ||
d680efe9 MF |
4347 | if (ctl.unblock_action != UNBLOCK_CONTINUE |
4348 | && lockres->l_ops->post_unlock) | |
4349 | lockres->l_ops->post_unlock(osb, lockres); | |
ccd979bd MF |
4350 | } |
4351 | ||
4352 | static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, | |
4353 | struct ocfs2_lock_res *lockres) | |
4354 | { | |
a75e9cca SE |
4355 | unsigned long flags; |
4356 | ||
ccd979bd MF |
4357 | assert_spin_locked(&lockres->l_lock); |
4358 | ||
4359 | if (lockres->l_flags & OCFS2_LOCK_FREEING) { | |
4360 | /* Do not schedule a lock for downconvert when it's on | |
4361 | * the way to destruction - any nodes wanting access | |
4362 | * to the resource will get it soon. */ | |
9b915181 | 4363 | mlog(ML_BASTS, "lockres %s won't be scheduled: flags 0x%lx\n", |
ccd979bd MF |
4364 | lockres->l_name, lockres->l_flags); |
4365 | return; | |
4366 | } | |
4367 | ||
4368 | lockres_or_flags(lockres, OCFS2_LOCK_QUEUED); | |
4369 | ||
a75e9cca | 4370 | spin_lock_irqsave(&osb->dc_task_lock, flags); |
ccd979bd MF |
4371 | if (list_empty(&lockres->l_blocked_list)) { |
4372 | list_add_tail(&lockres->l_blocked_list, | |
4373 | &osb->blocked_lock_list); | |
4374 | osb->blocked_lock_count++; | |
4375 | } | |
a75e9cca | 4376 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
ccd979bd | 4377 | } |
34d024f8 MF |
4378 | |
4379 | static void ocfs2_downconvert_thread_do_work(struct ocfs2_super *osb) | |
4380 | { | |
4381 | unsigned long processed; | |
a75e9cca | 4382 | unsigned long flags; |
34d024f8 MF |
4383 | struct ocfs2_lock_res *lockres; |
4384 | ||
a75e9cca | 4385 | spin_lock_irqsave(&osb->dc_task_lock, flags); |
34d024f8 MF |
4386 | /* grab this early so we know to try again if a state change and |
4387 | * wake happens part-way through our work */ | |
4388 | osb->dc_work_sequence = osb->dc_wake_sequence; | |
4389 | ||
4390 | processed = osb->blocked_lock_count; | |
209f7512 JQ |
4391 | /* |
4392 | * blocked lock processing in this loop might call iput which can | |
4393 | * remove items off osb->blocked_lock_list. Downconvert up to | |
4394 | * 'processed' number of locks, but stop short if we had some | |
4395 | * removed in ocfs2_mark_lockres_freeing when downconverting. | |
4396 | */ | |
4397 | while (processed && !list_empty(&osb->blocked_lock_list)) { | |
34d024f8 MF |
4398 | lockres = list_entry(osb->blocked_lock_list.next, |
4399 | struct ocfs2_lock_res, l_blocked_list); | |
4400 | list_del_init(&lockres->l_blocked_list); | |
4401 | osb->blocked_lock_count--; | |
a75e9cca | 4402 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
34d024f8 MF |
4403 | |
4404 | BUG_ON(!processed); | |
4405 | processed--; | |
4406 | ||
4407 | ocfs2_process_blocked_lock(osb, lockres); | |
4408 | ||
a75e9cca | 4409 | spin_lock_irqsave(&osb->dc_task_lock, flags); |
34d024f8 | 4410 | } |
a75e9cca | 4411 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
34d024f8 MF |
4412 | } |
4413 | ||
4414 | static int ocfs2_downconvert_thread_lists_empty(struct ocfs2_super *osb) | |
4415 | { | |
4416 | int empty = 0; | |
a75e9cca | 4417 | unsigned long flags; |
34d024f8 | 4418 | |
a75e9cca | 4419 | spin_lock_irqsave(&osb->dc_task_lock, flags); |
34d024f8 MF |
4420 | if (list_empty(&osb->blocked_lock_list)) |
4421 | empty = 1; | |
4422 | ||
a75e9cca | 4423 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
34d024f8 MF |
4424 | return empty; |
4425 | } | |
4426 | ||
4427 | static int ocfs2_downconvert_thread_should_wake(struct ocfs2_super *osb) | |
4428 | { | |
4429 | int should_wake = 0; | |
a75e9cca | 4430 | unsigned long flags; |
34d024f8 | 4431 | |
a75e9cca | 4432 | spin_lock_irqsave(&osb->dc_task_lock, flags); |
34d024f8 MF |
4433 | if (osb->dc_work_sequence != osb->dc_wake_sequence) |
4434 | should_wake = 1; | |
a75e9cca | 4435 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
34d024f8 MF |
4436 | |
4437 | return should_wake; | |
4438 | } | |
4439 | ||
200bfae3 | 4440 | static int ocfs2_downconvert_thread(void *arg) |
34d024f8 | 4441 | { |
34d024f8 MF |
4442 | struct ocfs2_super *osb = arg; |
4443 | ||
4444 | /* only quit once we've been asked to stop and there is no more | |
4445 | * work available */ | |
4446 | while (!(kthread_should_stop() && | |
4447 | ocfs2_downconvert_thread_lists_empty(osb))) { | |
4448 | ||
4449 | wait_event_interruptible(osb->dc_event, | |
4450 | ocfs2_downconvert_thread_should_wake(osb) || | |
4451 | kthread_should_stop()); | |
4452 | ||
4453 | mlog(0, "downconvert_thread: awoken\n"); | |
4454 | ||
4455 | ocfs2_downconvert_thread_do_work(osb); | |
4456 | } | |
4457 | ||
4458 | osb->dc_task = NULL; | |
4658d87c | 4459 | return 0; |
34d024f8 MF |
4460 | } |
4461 | ||
4462 | void ocfs2_wake_downconvert_thread(struct ocfs2_super *osb) | |
4463 | { | |
a75e9cca SE |
4464 | unsigned long flags; |
4465 | ||
4466 | spin_lock_irqsave(&osb->dc_task_lock, flags); | |
34d024f8 MF |
4467 | /* make sure the voting thread gets a swipe at whatever changes |
4468 | * the caller may have made to the voting state */ | |
4469 | osb->dc_wake_sequence++; | |
a75e9cca | 4470 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
34d024f8 MF |
4471 | wake_up(&osb->dc_event); |
4472 | } |