Commit | Line | Data |
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e7fd4179 DT |
1 | /****************************************************************************** |
2 | ******************************************************************************* | |
3 | ** | |
46b43eed | 4 | ** Copyright (C) 2005-2008 Red Hat, Inc. All rights reserved. |
e7fd4179 DT |
5 | ** |
6 | ** This copyrighted material is made available to anyone wishing to use, | |
7 | ** modify, copy, or redistribute it subject to the terms and conditions | |
8 | ** of the GNU General Public License v.2. | |
9 | ** | |
10 | ******************************************************************************* | |
11 | ******************************************************************************/ | |
12 | ||
13 | /* Central locking logic has four stages: | |
14 | ||
15 | dlm_lock() | |
16 | dlm_unlock() | |
17 | ||
18 | request_lock(ls, lkb) | |
19 | convert_lock(ls, lkb) | |
20 | unlock_lock(ls, lkb) | |
21 | cancel_lock(ls, lkb) | |
22 | ||
23 | _request_lock(r, lkb) | |
24 | _convert_lock(r, lkb) | |
25 | _unlock_lock(r, lkb) | |
26 | _cancel_lock(r, lkb) | |
27 | ||
28 | do_request(r, lkb) | |
29 | do_convert(r, lkb) | |
30 | do_unlock(r, lkb) | |
31 | do_cancel(r, lkb) | |
32 | ||
33 | Stage 1 (lock, unlock) is mainly about checking input args and | |
34 | splitting into one of the four main operations: | |
35 | ||
36 | dlm_lock = request_lock | |
37 | dlm_lock+CONVERT = convert_lock | |
38 | dlm_unlock = unlock_lock | |
39 | dlm_unlock+CANCEL = cancel_lock | |
40 | ||
41 | Stage 2, xxxx_lock(), just finds and locks the relevant rsb which is | |
42 | provided to the next stage. | |
43 | ||
44 | Stage 3, _xxxx_lock(), determines if the operation is local or remote. | |
45 | When remote, it calls send_xxxx(), when local it calls do_xxxx(). | |
46 | ||
47 | Stage 4, do_xxxx(), is the guts of the operation. It manipulates the | |
48 | given rsb and lkb and queues callbacks. | |
49 | ||
50 | For remote operations, send_xxxx() results in the corresponding do_xxxx() | |
51 | function being executed on the remote node. The connecting send/receive | |
52 | calls on local (L) and remote (R) nodes: | |
53 | ||
54 | L: send_xxxx() -> R: receive_xxxx() | |
55 | R: do_xxxx() | |
56 | L: receive_xxxx_reply() <- R: send_xxxx_reply() | |
57 | */ | |
597d0cae | 58 | #include <linux/types.h> |
e7fd4179 | 59 | #include "dlm_internal.h" |
597d0cae | 60 | #include <linux/dlm_device.h> |
e7fd4179 DT |
61 | #include "memory.h" |
62 | #include "lowcomms.h" | |
63 | #include "requestqueue.h" | |
64 | #include "util.h" | |
65 | #include "dir.h" | |
66 | #include "member.h" | |
67 | #include "lockspace.h" | |
68 | #include "ast.h" | |
69 | #include "lock.h" | |
70 | #include "rcom.h" | |
71 | #include "recover.h" | |
72 | #include "lvb_table.h" | |
597d0cae | 73 | #include "user.h" |
e7fd4179 DT |
74 | #include "config.h" |
75 | ||
76 | static int send_request(struct dlm_rsb *r, struct dlm_lkb *lkb); | |
77 | static int send_convert(struct dlm_rsb *r, struct dlm_lkb *lkb); | |
78 | static int send_unlock(struct dlm_rsb *r, struct dlm_lkb *lkb); | |
79 | static int send_cancel(struct dlm_rsb *r, struct dlm_lkb *lkb); | |
80 | static int send_grant(struct dlm_rsb *r, struct dlm_lkb *lkb); | |
81 | static int send_bast(struct dlm_rsb *r, struct dlm_lkb *lkb, int mode); | |
82 | static int send_lookup(struct dlm_rsb *r, struct dlm_lkb *lkb); | |
83 | static int send_remove(struct dlm_rsb *r); | |
84 | static int _request_lock(struct dlm_rsb *r, struct dlm_lkb *lkb); | |
3ae1acf9 | 85 | static int _cancel_lock(struct dlm_rsb *r, struct dlm_lkb *lkb); |
e7fd4179 DT |
86 | static void __receive_convert_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, |
87 | struct dlm_message *ms); | |
88 | static int receive_extralen(struct dlm_message *ms); | |
8499137d | 89 | static void do_purge(struct dlm_ls *ls, int nodeid, int pid); |
3ae1acf9 | 90 | static void del_timeout(struct dlm_lkb *lkb); |
e7fd4179 DT |
91 | |
92 | /* | |
93 | * Lock compatibilty matrix - thanks Steve | |
94 | * UN = Unlocked state. Not really a state, used as a flag | |
95 | * PD = Padding. Used to make the matrix a nice power of two in size | |
96 | * Other states are the same as the VMS DLM. | |
97 | * Usage: matrix[grmode+1][rqmode+1] (although m[rq+1][gr+1] is the same) | |
98 | */ | |
99 | ||
100 | static const int __dlm_compat_matrix[8][8] = { | |
101 | /* UN NL CR CW PR PW EX PD */ | |
102 | {1, 1, 1, 1, 1, 1, 1, 0}, /* UN */ | |
103 | {1, 1, 1, 1, 1, 1, 1, 0}, /* NL */ | |
104 | {1, 1, 1, 1, 1, 1, 0, 0}, /* CR */ | |
105 | {1, 1, 1, 1, 0, 0, 0, 0}, /* CW */ | |
106 | {1, 1, 1, 0, 1, 0, 0, 0}, /* PR */ | |
107 | {1, 1, 1, 0, 0, 0, 0, 0}, /* PW */ | |
108 | {1, 1, 0, 0, 0, 0, 0, 0}, /* EX */ | |
109 | {0, 0, 0, 0, 0, 0, 0, 0} /* PD */ | |
110 | }; | |
111 | ||
112 | /* | |
113 | * This defines the direction of transfer of LVB data. | |
114 | * Granted mode is the row; requested mode is the column. | |
115 | * Usage: matrix[grmode+1][rqmode+1] | |
116 | * 1 = LVB is returned to the caller | |
117 | * 0 = LVB is written to the resource | |
118 | * -1 = nothing happens to the LVB | |
119 | */ | |
120 | ||
121 | const int dlm_lvb_operations[8][8] = { | |
122 | /* UN NL CR CW PR PW EX PD*/ | |
123 | { -1, 1, 1, 1, 1, 1, 1, -1 }, /* UN */ | |
124 | { -1, 1, 1, 1, 1, 1, 1, 0 }, /* NL */ | |
125 | { -1, -1, 1, 1, 1, 1, 1, 0 }, /* CR */ | |
126 | { -1, -1, -1, 1, 1, 1, 1, 0 }, /* CW */ | |
127 | { -1, -1, -1, -1, 1, 1, 1, 0 }, /* PR */ | |
128 | { -1, 0, 0, 0, 0, 0, 1, 0 }, /* PW */ | |
129 | { -1, 0, 0, 0, 0, 0, 0, 0 }, /* EX */ | |
130 | { -1, 0, 0, 0, 0, 0, 0, 0 } /* PD */ | |
131 | }; | |
e7fd4179 DT |
132 | |
133 | #define modes_compat(gr, rq) \ | |
134 | __dlm_compat_matrix[(gr)->lkb_grmode + 1][(rq)->lkb_rqmode + 1] | |
135 | ||
136 | int dlm_modes_compat(int mode1, int mode2) | |
137 | { | |
138 | return __dlm_compat_matrix[mode1 + 1][mode2 + 1]; | |
139 | } | |
140 | ||
141 | /* | |
142 | * Compatibility matrix for conversions with QUECVT set. | |
143 | * Granted mode is the row; requested mode is the column. | |
144 | * Usage: matrix[grmode+1][rqmode+1] | |
145 | */ | |
146 | ||
147 | static const int __quecvt_compat_matrix[8][8] = { | |
148 | /* UN NL CR CW PR PW EX PD */ | |
149 | {0, 0, 0, 0, 0, 0, 0, 0}, /* UN */ | |
150 | {0, 0, 1, 1, 1, 1, 1, 0}, /* NL */ | |
151 | {0, 0, 0, 1, 1, 1, 1, 0}, /* CR */ | |
152 | {0, 0, 0, 0, 1, 1, 1, 0}, /* CW */ | |
153 | {0, 0, 0, 1, 0, 1, 1, 0}, /* PR */ | |
154 | {0, 0, 0, 0, 0, 0, 1, 0}, /* PW */ | |
155 | {0, 0, 0, 0, 0, 0, 0, 0}, /* EX */ | |
156 | {0, 0, 0, 0, 0, 0, 0, 0} /* PD */ | |
157 | }; | |
158 | ||
597d0cae | 159 | void dlm_print_lkb(struct dlm_lkb *lkb) |
e7fd4179 DT |
160 | { |
161 | printk(KERN_ERR "lkb: nodeid %d id %x remid %x exflags %x flags %x\n" | |
162 | " status %d rqmode %d grmode %d wait_type %d ast_type %d\n", | |
163 | lkb->lkb_nodeid, lkb->lkb_id, lkb->lkb_remid, lkb->lkb_exflags, | |
164 | lkb->lkb_flags, lkb->lkb_status, lkb->lkb_rqmode, | |
165 | lkb->lkb_grmode, lkb->lkb_wait_type, lkb->lkb_ast_type); | |
166 | } | |
167 | ||
168 | void dlm_print_rsb(struct dlm_rsb *r) | |
169 | { | |
170 | printk(KERN_ERR "rsb: nodeid %d flags %lx first %x rlc %d name %s\n", | |
171 | r->res_nodeid, r->res_flags, r->res_first_lkid, | |
172 | r->res_recover_locks_count, r->res_name); | |
173 | } | |
174 | ||
a345da3e DT |
175 | void dlm_dump_rsb(struct dlm_rsb *r) |
176 | { | |
177 | struct dlm_lkb *lkb; | |
178 | ||
179 | dlm_print_rsb(r); | |
180 | ||
181 | printk(KERN_ERR "rsb: root_list empty %d recover_list empty %d\n", | |
182 | list_empty(&r->res_root_list), list_empty(&r->res_recover_list)); | |
183 | printk(KERN_ERR "rsb lookup list\n"); | |
184 | list_for_each_entry(lkb, &r->res_lookup, lkb_rsb_lookup) | |
185 | dlm_print_lkb(lkb); | |
186 | printk(KERN_ERR "rsb grant queue:\n"); | |
187 | list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) | |
188 | dlm_print_lkb(lkb); | |
189 | printk(KERN_ERR "rsb convert queue:\n"); | |
190 | list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) | |
191 | dlm_print_lkb(lkb); | |
192 | printk(KERN_ERR "rsb wait queue:\n"); | |
193 | list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue) | |
194 | dlm_print_lkb(lkb); | |
195 | } | |
196 | ||
e7fd4179 DT |
197 | /* Threads cannot use the lockspace while it's being recovered */ |
198 | ||
85e86edf | 199 | static inline void dlm_lock_recovery(struct dlm_ls *ls) |
e7fd4179 DT |
200 | { |
201 | down_read(&ls->ls_in_recovery); | |
202 | } | |
203 | ||
85e86edf | 204 | void dlm_unlock_recovery(struct dlm_ls *ls) |
e7fd4179 DT |
205 | { |
206 | up_read(&ls->ls_in_recovery); | |
207 | } | |
208 | ||
85e86edf | 209 | int dlm_lock_recovery_try(struct dlm_ls *ls) |
e7fd4179 DT |
210 | { |
211 | return down_read_trylock(&ls->ls_in_recovery); | |
212 | } | |
213 | ||
214 | static inline int can_be_queued(struct dlm_lkb *lkb) | |
215 | { | |
216 | return !(lkb->lkb_exflags & DLM_LKF_NOQUEUE); | |
217 | } | |
218 | ||
219 | static inline int force_blocking_asts(struct dlm_lkb *lkb) | |
220 | { | |
221 | return (lkb->lkb_exflags & DLM_LKF_NOQUEUEBAST); | |
222 | } | |
223 | ||
224 | static inline int is_demoted(struct dlm_lkb *lkb) | |
225 | { | |
226 | return (lkb->lkb_sbflags & DLM_SBF_DEMOTED); | |
227 | } | |
228 | ||
7d3c1feb DT |
229 | static inline int is_altmode(struct dlm_lkb *lkb) |
230 | { | |
231 | return (lkb->lkb_sbflags & DLM_SBF_ALTMODE); | |
232 | } | |
233 | ||
234 | static inline int is_granted(struct dlm_lkb *lkb) | |
235 | { | |
236 | return (lkb->lkb_status == DLM_LKSTS_GRANTED); | |
237 | } | |
238 | ||
e7fd4179 DT |
239 | static inline int is_remote(struct dlm_rsb *r) |
240 | { | |
241 | DLM_ASSERT(r->res_nodeid >= 0, dlm_print_rsb(r);); | |
242 | return !!r->res_nodeid; | |
243 | } | |
244 | ||
245 | static inline int is_process_copy(struct dlm_lkb *lkb) | |
246 | { | |
247 | return (lkb->lkb_nodeid && !(lkb->lkb_flags & DLM_IFL_MSTCPY)); | |
248 | } | |
249 | ||
250 | static inline int is_master_copy(struct dlm_lkb *lkb) | |
251 | { | |
252 | if (lkb->lkb_flags & DLM_IFL_MSTCPY) | |
253 | DLM_ASSERT(lkb->lkb_nodeid, dlm_print_lkb(lkb);); | |
90135925 | 254 | return (lkb->lkb_flags & DLM_IFL_MSTCPY) ? 1 : 0; |
e7fd4179 DT |
255 | } |
256 | ||
257 | static inline int middle_conversion(struct dlm_lkb *lkb) | |
258 | { | |
259 | if ((lkb->lkb_grmode==DLM_LOCK_PR && lkb->lkb_rqmode==DLM_LOCK_CW) || | |
260 | (lkb->lkb_rqmode==DLM_LOCK_PR && lkb->lkb_grmode==DLM_LOCK_CW)) | |
90135925 DT |
261 | return 1; |
262 | return 0; | |
e7fd4179 DT |
263 | } |
264 | ||
265 | static inline int down_conversion(struct dlm_lkb *lkb) | |
266 | { | |
267 | return (!middle_conversion(lkb) && lkb->lkb_rqmode < lkb->lkb_grmode); | |
268 | } | |
269 | ||
ef0c2bb0 DT |
270 | static inline int is_overlap_unlock(struct dlm_lkb *lkb) |
271 | { | |
272 | return lkb->lkb_flags & DLM_IFL_OVERLAP_UNLOCK; | |
273 | } | |
274 | ||
275 | static inline int is_overlap_cancel(struct dlm_lkb *lkb) | |
276 | { | |
277 | return lkb->lkb_flags & DLM_IFL_OVERLAP_CANCEL; | |
278 | } | |
279 | ||
280 | static inline int is_overlap(struct dlm_lkb *lkb) | |
281 | { | |
282 | return (lkb->lkb_flags & (DLM_IFL_OVERLAP_UNLOCK | | |
283 | DLM_IFL_OVERLAP_CANCEL)); | |
284 | } | |
285 | ||
e7fd4179 DT |
286 | static void queue_cast(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv) |
287 | { | |
288 | if (is_master_copy(lkb)) | |
289 | return; | |
290 | ||
3ae1acf9 DT |
291 | del_timeout(lkb); |
292 | ||
e7fd4179 DT |
293 | DLM_ASSERT(lkb->lkb_lksb, dlm_print_lkb(lkb);); |
294 | ||
3ae1acf9 DT |
295 | /* if the operation was a cancel, then return -DLM_ECANCEL, if a |
296 | timeout caused the cancel then return -ETIMEDOUT */ | |
297 | if (rv == -DLM_ECANCEL && (lkb->lkb_flags & DLM_IFL_TIMEOUT_CANCEL)) { | |
298 | lkb->lkb_flags &= ~DLM_IFL_TIMEOUT_CANCEL; | |
299 | rv = -ETIMEDOUT; | |
300 | } | |
301 | ||
8b4021fa DT |
302 | if (rv == -DLM_ECANCEL && (lkb->lkb_flags & DLM_IFL_DEADLOCK_CANCEL)) { |
303 | lkb->lkb_flags &= ~DLM_IFL_DEADLOCK_CANCEL; | |
304 | rv = -EDEADLK; | |
305 | } | |
306 | ||
e7fd4179 DT |
307 | lkb->lkb_lksb->sb_status = rv; |
308 | lkb->lkb_lksb->sb_flags = lkb->lkb_sbflags; | |
309 | ||
310 | dlm_add_ast(lkb, AST_COMP); | |
311 | } | |
312 | ||
ef0c2bb0 DT |
313 | static inline void queue_cast_overlap(struct dlm_rsb *r, struct dlm_lkb *lkb) |
314 | { | |
315 | queue_cast(r, lkb, | |
316 | is_overlap_unlock(lkb) ? -DLM_EUNLOCK : -DLM_ECANCEL); | |
317 | } | |
318 | ||
e7fd4179 DT |
319 | static void queue_bast(struct dlm_rsb *r, struct dlm_lkb *lkb, int rqmode) |
320 | { | |
321 | if (is_master_copy(lkb)) | |
322 | send_bast(r, lkb, rqmode); | |
323 | else { | |
324 | lkb->lkb_bastmode = rqmode; | |
325 | dlm_add_ast(lkb, AST_BAST); | |
326 | } | |
327 | } | |
328 | ||
329 | /* | |
330 | * Basic operations on rsb's and lkb's | |
331 | */ | |
332 | ||
333 | static struct dlm_rsb *create_rsb(struct dlm_ls *ls, char *name, int len) | |
334 | { | |
335 | struct dlm_rsb *r; | |
336 | ||
52bda2b5 | 337 | r = dlm_allocate_rsb(ls, len); |
e7fd4179 DT |
338 | if (!r) |
339 | return NULL; | |
340 | ||
341 | r->res_ls = ls; | |
342 | r->res_length = len; | |
343 | memcpy(r->res_name, name, len); | |
90135925 | 344 | mutex_init(&r->res_mutex); |
e7fd4179 DT |
345 | |
346 | INIT_LIST_HEAD(&r->res_lookup); | |
347 | INIT_LIST_HEAD(&r->res_grantqueue); | |
348 | INIT_LIST_HEAD(&r->res_convertqueue); | |
349 | INIT_LIST_HEAD(&r->res_waitqueue); | |
350 | INIT_LIST_HEAD(&r->res_root_list); | |
351 | INIT_LIST_HEAD(&r->res_recover_list); | |
352 | ||
353 | return r; | |
354 | } | |
355 | ||
356 | static int search_rsb_list(struct list_head *head, char *name, int len, | |
357 | unsigned int flags, struct dlm_rsb **r_ret) | |
358 | { | |
359 | struct dlm_rsb *r; | |
360 | int error = 0; | |
361 | ||
362 | list_for_each_entry(r, head, res_hashchain) { | |
363 | if (len == r->res_length && !memcmp(name, r->res_name, len)) | |
364 | goto found; | |
365 | } | |
597d0cae | 366 | return -EBADR; |
e7fd4179 DT |
367 | |
368 | found: | |
369 | if (r->res_nodeid && (flags & R_MASTER)) | |
370 | error = -ENOTBLK; | |
371 | *r_ret = r; | |
372 | return error; | |
373 | } | |
374 | ||
375 | static int _search_rsb(struct dlm_ls *ls, char *name, int len, int b, | |
376 | unsigned int flags, struct dlm_rsb **r_ret) | |
377 | { | |
378 | struct dlm_rsb *r; | |
379 | int error; | |
380 | ||
381 | error = search_rsb_list(&ls->ls_rsbtbl[b].list, name, len, flags, &r); | |
382 | if (!error) { | |
383 | kref_get(&r->res_ref); | |
384 | goto out; | |
385 | } | |
386 | error = search_rsb_list(&ls->ls_rsbtbl[b].toss, name, len, flags, &r); | |
387 | if (error) | |
388 | goto out; | |
389 | ||
390 | list_move(&r->res_hashchain, &ls->ls_rsbtbl[b].list); | |
391 | ||
392 | if (dlm_no_directory(ls)) | |
393 | goto out; | |
394 | ||
395 | if (r->res_nodeid == -1) { | |
396 | rsb_clear_flag(r, RSB_MASTER_UNCERTAIN); | |
397 | r->res_first_lkid = 0; | |
398 | } else if (r->res_nodeid > 0) { | |
399 | rsb_set_flag(r, RSB_MASTER_UNCERTAIN); | |
400 | r->res_first_lkid = 0; | |
401 | } else { | |
402 | DLM_ASSERT(r->res_nodeid == 0, dlm_print_rsb(r);); | |
403 | DLM_ASSERT(!rsb_flag(r, RSB_MASTER_UNCERTAIN),); | |
404 | } | |
405 | out: | |
406 | *r_ret = r; | |
407 | return error; | |
408 | } | |
409 | ||
410 | static int search_rsb(struct dlm_ls *ls, char *name, int len, int b, | |
411 | unsigned int flags, struct dlm_rsb **r_ret) | |
412 | { | |
413 | int error; | |
414 | write_lock(&ls->ls_rsbtbl[b].lock); | |
415 | error = _search_rsb(ls, name, len, b, flags, r_ret); | |
416 | write_unlock(&ls->ls_rsbtbl[b].lock); | |
417 | return error; | |
418 | } | |
419 | ||
420 | /* | |
421 | * Find rsb in rsbtbl and potentially create/add one | |
422 | * | |
423 | * Delaying the release of rsb's has a similar benefit to applications keeping | |
424 | * NL locks on an rsb, but without the guarantee that the cached master value | |
425 | * will still be valid when the rsb is reused. Apps aren't always smart enough | |
426 | * to keep NL locks on an rsb that they may lock again shortly; this can lead | |
427 | * to excessive master lookups and removals if we don't delay the release. | |
428 | * | |
429 | * Searching for an rsb means looking through both the normal list and toss | |
430 | * list. When found on the toss list the rsb is moved to the normal list with | |
431 | * ref count of 1; when found on normal list the ref count is incremented. | |
432 | */ | |
433 | ||
434 | static int find_rsb(struct dlm_ls *ls, char *name, int namelen, | |
435 | unsigned int flags, struct dlm_rsb **r_ret) | |
436 | { | |
437 | struct dlm_rsb *r, *tmp; | |
438 | uint32_t hash, bucket; | |
ef58bcca AV |
439 | int error = -EINVAL; |
440 | ||
441 | if (namelen > DLM_RESNAME_MAXLEN) | |
442 | goto out; | |
e7fd4179 DT |
443 | |
444 | if (dlm_no_directory(ls)) | |
445 | flags |= R_CREATE; | |
446 | ||
ef58bcca | 447 | error = 0; |
e7fd4179 DT |
448 | hash = jhash(name, namelen, 0); |
449 | bucket = hash & (ls->ls_rsbtbl_size - 1); | |
450 | ||
451 | error = search_rsb(ls, name, namelen, bucket, flags, &r); | |
452 | if (!error) | |
453 | goto out; | |
454 | ||
597d0cae | 455 | if (error == -EBADR && !(flags & R_CREATE)) |
e7fd4179 DT |
456 | goto out; |
457 | ||
458 | /* the rsb was found but wasn't a master copy */ | |
459 | if (error == -ENOTBLK) | |
460 | goto out; | |
461 | ||
462 | error = -ENOMEM; | |
463 | r = create_rsb(ls, name, namelen); | |
464 | if (!r) | |
465 | goto out; | |
466 | ||
467 | r->res_hash = hash; | |
468 | r->res_bucket = bucket; | |
469 | r->res_nodeid = -1; | |
470 | kref_init(&r->res_ref); | |
471 | ||
472 | /* With no directory, the master can be set immediately */ | |
473 | if (dlm_no_directory(ls)) { | |
474 | int nodeid = dlm_dir_nodeid(r); | |
475 | if (nodeid == dlm_our_nodeid()) | |
476 | nodeid = 0; | |
477 | r->res_nodeid = nodeid; | |
478 | } | |
479 | ||
480 | write_lock(&ls->ls_rsbtbl[bucket].lock); | |
481 | error = _search_rsb(ls, name, namelen, bucket, 0, &tmp); | |
482 | if (!error) { | |
483 | write_unlock(&ls->ls_rsbtbl[bucket].lock); | |
52bda2b5 | 484 | dlm_free_rsb(r); |
e7fd4179 DT |
485 | r = tmp; |
486 | goto out; | |
487 | } | |
488 | list_add(&r->res_hashchain, &ls->ls_rsbtbl[bucket].list); | |
489 | write_unlock(&ls->ls_rsbtbl[bucket].lock); | |
490 | error = 0; | |
491 | out: | |
492 | *r_ret = r; | |
493 | return error; | |
494 | } | |
495 | ||
e7fd4179 DT |
496 | /* This is only called to add a reference when the code already holds |
497 | a valid reference to the rsb, so there's no need for locking. */ | |
498 | ||
499 | static inline void hold_rsb(struct dlm_rsb *r) | |
500 | { | |
501 | kref_get(&r->res_ref); | |
502 | } | |
503 | ||
504 | void dlm_hold_rsb(struct dlm_rsb *r) | |
505 | { | |
506 | hold_rsb(r); | |
507 | } | |
508 | ||
509 | static void toss_rsb(struct kref *kref) | |
510 | { | |
511 | struct dlm_rsb *r = container_of(kref, struct dlm_rsb, res_ref); | |
512 | struct dlm_ls *ls = r->res_ls; | |
513 | ||
514 | DLM_ASSERT(list_empty(&r->res_root_list), dlm_print_rsb(r);); | |
515 | kref_init(&r->res_ref); | |
516 | list_move(&r->res_hashchain, &ls->ls_rsbtbl[r->res_bucket].toss); | |
517 | r->res_toss_time = jiffies; | |
518 | if (r->res_lvbptr) { | |
52bda2b5 | 519 | dlm_free_lvb(r->res_lvbptr); |
e7fd4179 DT |
520 | r->res_lvbptr = NULL; |
521 | } | |
522 | } | |
523 | ||
524 | /* When all references to the rsb are gone it's transfered to | |
525 | the tossed list for later disposal. */ | |
526 | ||
527 | static void put_rsb(struct dlm_rsb *r) | |
528 | { | |
529 | struct dlm_ls *ls = r->res_ls; | |
530 | uint32_t bucket = r->res_bucket; | |
531 | ||
532 | write_lock(&ls->ls_rsbtbl[bucket].lock); | |
533 | kref_put(&r->res_ref, toss_rsb); | |
534 | write_unlock(&ls->ls_rsbtbl[bucket].lock); | |
535 | } | |
536 | ||
537 | void dlm_put_rsb(struct dlm_rsb *r) | |
538 | { | |
539 | put_rsb(r); | |
540 | } | |
541 | ||
542 | /* See comment for unhold_lkb */ | |
543 | ||
544 | static void unhold_rsb(struct dlm_rsb *r) | |
545 | { | |
546 | int rv; | |
547 | rv = kref_put(&r->res_ref, toss_rsb); | |
a345da3e | 548 | DLM_ASSERT(!rv, dlm_dump_rsb(r);); |
e7fd4179 DT |
549 | } |
550 | ||
551 | static void kill_rsb(struct kref *kref) | |
552 | { | |
553 | struct dlm_rsb *r = container_of(kref, struct dlm_rsb, res_ref); | |
554 | ||
555 | /* All work is done after the return from kref_put() so we | |
556 | can release the write_lock before the remove and free. */ | |
557 | ||
a345da3e DT |
558 | DLM_ASSERT(list_empty(&r->res_lookup), dlm_dump_rsb(r);); |
559 | DLM_ASSERT(list_empty(&r->res_grantqueue), dlm_dump_rsb(r);); | |
560 | DLM_ASSERT(list_empty(&r->res_convertqueue), dlm_dump_rsb(r);); | |
561 | DLM_ASSERT(list_empty(&r->res_waitqueue), dlm_dump_rsb(r);); | |
562 | DLM_ASSERT(list_empty(&r->res_root_list), dlm_dump_rsb(r);); | |
563 | DLM_ASSERT(list_empty(&r->res_recover_list), dlm_dump_rsb(r);); | |
e7fd4179 DT |
564 | } |
565 | ||
566 | /* Attaching/detaching lkb's from rsb's is for rsb reference counting. | |
567 | The rsb must exist as long as any lkb's for it do. */ | |
568 | ||
569 | static void attach_lkb(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
570 | { | |
571 | hold_rsb(r); | |
572 | lkb->lkb_resource = r; | |
573 | } | |
574 | ||
575 | static void detach_lkb(struct dlm_lkb *lkb) | |
576 | { | |
577 | if (lkb->lkb_resource) { | |
578 | put_rsb(lkb->lkb_resource); | |
579 | lkb->lkb_resource = NULL; | |
580 | } | |
581 | } | |
582 | ||
583 | static int create_lkb(struct dlm_ls *ls, struct dlm_lkb **lkb_ret) | |
584 | { | |
585 | struct dlm_lkb *lkb, *tmp; | |
586 | uint32_t lkid = 0; | |
587 | uint16_t bucket; | |
588 | ||
52bda2b5 | 589 | lkb = dlm_allocate_lkb(ls); |
e7fd4179 DT |
590 | if (!lkb) |
591 | return -ENOMEM; | |
592 | ||
593 | lkb->lkb_nodeid = -1; | |
594 | lkb->lkb_grmode = DLM_LOCK_IV; | |
595 | kref_init(&lkb->lkb_ref); | |
34e22bed | 596 | INIT_LIST_HEAD(&lkb->lkb_ownqueue); |
ef0c2bb0 | 597 | INIT_LIST_HEAD(&lkb->lkb_rsb_lookup); |
3ae1acf9 | 598 | INIT_LIST_HEAD(&lkb->lkb_time_list); |
e7fd4179 DT |
599 | |
600 | get_random_bytes(&bucket, sizeof(bucket)); | |
601 | bucket &= (ls->ls_lkbtbl_size - 1); | |
602 | ||
603 | write_lock(&ls->ls_lkbtbl[bucket].lock); | |
604 | ||
605 | /* counter can roll over so we must verify lkid is not in use */ | |
606 | ||
607 | while (lkid == 0) { | |
ce03f12b | 608 | lkid = (bucket << 16) | ls->ls_lkbtbl[bucket].counter++; |
e7fd4179 DT |
609 | |
610 | list_for_each_entry(tmp, &ls->ls_lkbtbl[bucket].list, | |
611 | lkb_idtbl_list) { | |
612 | if (tmp->lkb_id != lkid) | |
613 | continue; | |
614 | lkid = 0; | |
615 | break; | |
616 | } | |
617 | } | |
618 | ||
619 | lkb->lkb_id = lkid; | |
620 | list_add(&lkb->lkb_idtbl_list, &ls->ls_lkbtbl[bucket].list); | |
621 | write_unlock(&ls->ls_lkbtbl[bucket].lock); | |
622 | ||
623 | *lkb_ret = lkb; | |
624 | return 0; | |
625 | } | |
626 | ||
627 | static struct dlm_lkb *__find_lkb(struct dlm_ls *ls, uint32_t lkid) | |
628 | { | |
e7fd4179 | 629 | struct dlm_lkb *lkb; |
ce03f12b | 630 | uint16_t bucket = (lkid >> 16); |
e7fd4179 DT |
631 | |
632 | list_for_each_entry(lkb, &ls->ls_lkbtbl[bucket].list, lkb_idtbl_list) { | |
633 | if (lkb->lkb_id == lkid) | |
634 | return lkb; | |
635 | } | |
636 | return NULL; | |
637 | } | |
638 | ||
639 | static int find_lkb(struct dlm_ls *ls, uint32_t lkid, struct dlm_lkb **lkb_ret) | |
640 | { | |
641 | struct dlm_lkb *lkb; | |
ce03f12b | 642 | uint16_t bucket = (lkid >> 16); |
e7fd4179 DT |
643 | |
644 | if (bucket >= ls->ls_lkbtbl_size) | |
645 | return -EBADSLT; | |
646 | ||
647 | read_lock(&ls->ls_lkbtbl[bucket].lock); | |
648 | lkb = __find_lkb(ls, lkid); | |
649 | if (lkb) | |
650 | kref_get(&lkb->lkb_ref); | |
651 | read_unlock(&ls->ls_lkbtbl[bucket].lock); | |
652 | ||
653 | *lkb_ret = lkb; | |
654 | return lkb ? 0 : -ENOENT; | |
655 | } | |
656 | ||
657 | static void kill_lkb(struct kref *kref) | |
658 | { | |
659 | struct dlm_lkb *lkb = container_of(kref, struct dlm_lkb, lkb_ref); | |
660 | ||
661 | /* All work is done after the return from kref_put() so we | |
662 | can release the write_lock before the detach_lkb */ | |
663 | ||
664 | DLM_ASSERT(!lkb->lkb_status, dlm_print_lkb(lkb);); | |
665 | } | |
666 | ||
b3f58d8f DT |
667 | /* __put_lkb() is used when an lkb may not have an rsb attached to |
668 | it so we need to provide the lockspace explicitly */ | |
669 | ||
670 | static int __put_lkb(struct dlm_ls *ls, struct dlm_lkb *lkb) | |
e7fd4179 | 671 | { |
ce03f12b | 672 | uint16_t bucket = (lkb->lkb_id >> 16); |
e7fd4179 DT |
673 | |
674 | write_lock(&ls->ls_lkbtbl[bucket].lock); | |
675 | if (kref_put(&lkb->lkb_ref, kill_lkb)) { | |
676 | list_del(&lkb->lkb_idtbl_list); | |
677 | write_unlock(&ls->ls_lkbtbl[bucket].lock); | |
678 | ||
679 | detach_lkb(lkb); | |
680 | ||
681 | /* for local/process lkbs, lvbptr points to caller's lksb */ | |
682 | if (lkb->lkb_lvbptr && is_master_copy(lkb)) | |
52bda2b5 DT |
683 | dlm_free_lvb(lkb->lkb_lvbptr); |
684 | dlm_free_lkb(lkb); | |
e7fd4179 DT |
685 | return 1; |
686 | } else { | |
687 | write_unlock(&ls->ls_lkbtbl[bucket].lock); | |
688 | return 0; | |
689 | } | |
690 | } | |
691 | ||
692 | int dlm_put_lkb(struct dlm_lkb *lkb) | |
693 | { | |
b3f58d8f DT |
694 | struct dlm_ls *ls; |
695 | ||
696 | DLM_ASSERT(lkb->lkb_resource, dlm_print_lkb(lkb);); | |
697 | DLM_ASSERT(lkb->lkb_resource->res_ls, dlm_print_lkb(lkb);); | |
698 | ||
699 | ls = lkb->lkb_resource->res_ls; | |
700 | return __put_lkb(ls, lkb); | |
e7fd4179 DT |
701 | } |
702 | ||
703 | /* This is only called to add a reference when the code already holds | |
704 | a valid reference to the lkb, so there's no need for locking. */ | |
705 | ||
706 | static inline void hold_lkb(struct dlm_lkb *lkb) | |
707 | { | |
708 | kref_get(&lkb->lkb_ref); | |
709 | } | |
710 | ||
711 | /* This is called when we need to remove a reference and are certain | |
712 | it's not the last ref. e.g. del_lkb is always called between a | |
713 | find_lkb/put_lkb and is always the inverse of a previous add_lkb. | |
714 | put_lkb would work fine, but would involve unnecessary locking */ | |
715 | ||
716 | static inline void unhold_lkb(struct dlm_lkb *lkb) | |
717 | { | |
718 | int rv; | |
719 | rv = kref_put(&lkb->lkb_ref, kill_lkb); | |
720 | DLM_ASSERT(!rv, dlm_print_lkb(lkb);); | |
721 | } | |
722 | ||
723 | static void lkb_add_ordered(struct list_head *new, struct list_head *head, | |
724 | int mode) | |
725 | { | |
726 | struct dlm_lkb *lkb = NULL; | |
727 | ||
728 | list_for_each_entry(lkb, head, lkb_statequeue) | |
729 | if (lkb->lkb_rqmode < mode) | |
730 | break; | |
731 | ||
732 | if (!lkb) | |
733 | list_add_tail(new, head); | |
734 | else | |
735 | __list_add(new, lkb->lkb_statequeue.prev, &lkb->lkb_statequeue); | |
736 | } | |
737 | ||
738 | /* add/remove lkb to rsb's grant/convert/wait queue */ | |
739 | ||
740 | static void add_lkb(struct dlm_rsb *r, struct dlm_lkb *lkb, int status) | |
741 | { | |
742 | kref_get(&lkb->lkb_ref); | |
743 | ||
744 | DLM_ASSERT(!lkb->lkb_status, dlm_print_lkb(lkb);); | |
745 | ||
746 | lkb->lkb_status = status; | |
747 | ||
748 | switch (status) { | |
749 | case DLM_LKSTS_WAITING: | |
750 | if (lkb->lkb_exflags & DLM_LKF_HEADQUE) | |
751 | list_add(&lkb->lkb_statequeue, &r->res_waitqueue); | |
752 | else | |
753 | list_add_tail(&lkb->lkb_statequeue, &r->res_waitqueue); | |
754 | break; | |
755 | case DLM_LKSTS_GRANTED: | |
756 | /* convention says granted locks kept in order of grmode */ | |
757 | lkb_add_ordered(&lkb->lkb_statequeue, &r->res_grantqueue, | |
758 | lkb->lkb_grmode); | |
759 | break; | |
760 | case DLM_LKSTS_CONVERT: | |
761 | if (lkb->lkb_exflags & DLM_LKF_HEADQUE) | |
762 | list_add(&lkb->lkb_statequeue, &r->res_convertqueue); | |
763 | else | |
764 | list_add_tail(&lkb->lkb_statequeue, | |
765 | &r->res_convertqueue); | |
766 | break; | |
767 | default: | |
768 | DLM_ASSERT(0, dlm_print_lkb(lkb); printk("sts=%d\n", status);); | |
769 | } | |
770 | } | |
771 | ||
772 | static void del_lkb(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
773 | { | |
774 | lkb->lkb_status = 0; | |
775 | list_del(&lkb->lkb_statequeue); | |
776 | unhold_lkb(lkb); | |
777 | } | |
778 | ||
779 | static void move_lkb(struct dlm_rsb *r, struct dlm_lkb *lkb, int sts) | |
780 | { | |
781 | hold_lkb(lkb); | |
782 | del_lkb(r, lkb); | |
783 | add_lkb(r, lkb, sts); | |
784 | unhold_lkb(lkb); | |
785 | } | |
786 | ||
ef0c2bb0 DT |
787 | static int msg_reply_type(int mstype) |
788 | { | |
789 | switch (mstype) { | |
790 | case DLM_MSG_REQUEST: | |
791 | return DLM_MSG_REQUEST_REPLY; | |
792 | case DLM_MSG_CONVERT: | |
793 | return DLM_MSG_CONVERT_REPLY; | |
794 | case DLM_MSG_UNLOCK: | |
795 | return DLM_MSG_UNLOCK_REPLY; | |
796 | case DLM_MSG_CANCEL: | |
797 | return DLM_MSG_CANCEL_REPLY; | |
798 | case DLM_MSG_LOOKUP: | |
799 | return DLM_MSG_LOOKUP_REPLY; | |
800 | } | |
801 | return -1; | |
802 | } | |
803 | ||
e7fd4179 DT |
804 | /* add/remove lkb from global waiters list of lkb's waiting for |
805 | a reply from a remote node */ | |
806 | ||
ef0c2bb0 | 807 | static int add_to_waiters(struct dlm_lkb *lkb, int mstype) |
e7fd4179 DT |
808 | { |
809 | struct dlm_ls *ls = lkb->lkb_resource->res_ls; | |
ef0c2bb0 | 810 | int error = 0; |
e7fd4179 | 811 | |
90135925 | 812 | mutex_lock(&ls->ls_waiters_mutex); |
ef0c2bb0 DT |
813 | |
814 | if (is_overlap_unlock(lkb) || | |
815 | (is_overlap_cancel(lkb) && (mstype == DLM_MSG_CANCEL))) { | |
816 | error = -EINVAL; | |
817 | goto out; | |
818 | } | |
819 | ||
820 | if (lkb->lkb_wait_type || is_overlap_cancel(lkb)) { | |
821 | switch (mstype) { | |
822 | case DLM_MSG_UNLOCK: | |
823 | lkb->lkb_flags |= DLM_IFL_OVERLAP_UNLOCK; | |
824 | break; | |
825 | case DLM_MSG_CANCEL: | |
826 | lkb->lkb_flags |= DLM_IFL_OVERLAP_CANCEL; | |
827 | break; | |
828 | default: | |
829 | error = -EBUSY; | |
830 | goto out; | |
831 | } | |
832 | lkb->lkb_wait_count++; | |
833 | hold_lkb(lkb); | |
834 | ||
835 | log_debug(ls, "add overlap %x cur %d new %d count %d flags %x", | |
836 | lkb->lkb_id, lkb->lkb_wait_type, mstype, | |
837 | lkb->lkb_wait_count, lkb->lkb_flags); | |
e7fd4179 DT |
838 | goto out; |
839 | } | |
ef0c2bb0 DT |
840 | |
841 | DLM_ASSERT(!lkb->lkb_wait_count, | |
842 | dlm_print_lkb(lkb); | |
843 | printk("wait_count %d\n", lkb->lkb_wait_count);); | |
844 | ||
845 | lkb->lkb_wait_count++; | |
e7fd4179 | 846 | lkb->lkb_wait_type = mstype; |
ef0c2bb0 | 847 | hold_lkb(lkb); |
e7fd4179 DT |
848 | list_add(&lkb->lkb_wait_reply, &ls->ls_waiters); |
849 | out: | |
ef0c2bb0 DT |
850 | if (error) |
851 | log_error(ls, "add_to_waiters %x error %d flags %x %d %d %s", | |
852 | lkb->lkb_id, error, lkb->lkb_flags, mstype, | |
853 | lkb->lkb_wait_type, lkb->lkb_resource->res_name); | |
90135925 | 854 | mutex_unlock(&ls->ls_waiters_mutex); |
ef0c2bb0 | 855 | return error; |
e7fd4179 DT |
856 | } |
857 | ||
b790c3b7 DT |
858 | /* We clear the RESEND flag because we might be taking an lkb off the waiters |
859 | list as part of process_requestqueue (e.g. a lookup that has an optimized | |
860 | request reply on the requestqueue) between dlm_recover_waiters_pre() which | |
861 | set RESEND and dlm_recover_waiters_post() */ | |
862 | ||
ef0c2bb0 | 863 | static int _remove_from_waiters(struct dlm_lkb *lkb, int mstype) |
e7fd4179 | 864 | { |
ef0c2bb0 DT |
865 | struct dlm_ls *ls = lkb->lkb_resource->res_ls; |
866 | int overlap_done = 0; | |
e7fd4179 | 867 | |
ef0c2bb0 DT |
868 | if (is_overlap_unlock(lkb) && (mstype == DLM_MSG_UNLOCK_REPLY)) { |
869 | lkb->lkb_flags &= ~DLM_IFL_OVERLAP_UNLOCK; | |
870 | overlap_done = 1; | |
871 | goto out_del; | |
e7fd4179 | 872 | } |
ef0c2bb0 DT |
873 | |
874 | if (is_overlap_cancel(lkb) && (mstype == DLM_MSG_CANCEL_REPLY)) { | |
875 | lkb->lkb_flags &= ~DLM_IFL_OVERLAP_CANCEL; | |
876 | overlap_done = 1; | |
877 | goto out_del; | |
878 | } | |
879 | ||
880 | /* N.B. type of reply may not always correspond to type of original | |
881 | msg due to lookup->request optimization, verify others? */ | |
882 | ||
883 | if (lkb->lkb_wait_type) { | |
884 | lkb->lkb_wait_type = 0; | |
885 | goto out_del; | |
886 | } | |
887 | ||
888 | log_error(ls, "remove_from_waiters lkid %x flags %x types %d %d", | |
889 | lkb->lkb_id, lkb->lkb_flags, mstype, lkb->lkb_wait_type); | |
890 | return -1; | |
891 | ||
892 | out_del: | |
893 | /* the force-unlock/cancel has completed and we haven't recvd a reply | |
894 | to the op that was in progress prior to the unlock/cancel; we | |
895 | give up on any reply to the earlier op. FIXME: not sure when/how | |
896 | this would happen */ | |
897 | ||
898 | if (overlap_done && lkb->lkb_wait_type) { | |
899 | log_error(ls, "remove_from_waiters %x reply %d give up on %d", | |
900 | lkb->lkb_id, mstype, lkb->lkb_wait_type); | |
901 | lkb->lkb_wait_count--; | |
902 | lkb->lkb_wait_type = 0; | |
903 | } | |
904 | ||
905 | DLM_ASSERT(lkb->lkb_wait_count, dlm_print_lkb(lkb);); | |
906 | ||
b790c3b7 | 907 | lkb->lkb_flags &= ~DLM_IFL_RESEND; |
ef0c2bb0 DT |
908 | lkb->lkb_wait_count--; |
909 | if (!lkb->lkb_wait_count) | |
910 | list_del_init(&lkb->lkb_wait_reply); | |
e7fd4179 | 911 | unhold_lkb(lkb); |
ef0c2bb0 | 912 | return 0; |
e7fd4179 DT |
913 | } |
914 | ||
ef0c2bb0 | 915 | static int remove_from_waiters(struct dlm_lkb *lkb, int mstype) |
e7fd4179 DT |
916 | { |
917 | struct dlm_ls *ls = lkb->lkb_resource->res_ls; | |
918 | int error; | |
919 | ||
90135925 | 920 | mutex_lock(&ls->ls_waiters_mutex); |
ef0c2bb0 | 921 | error = _remove_from_waiters(lkb, mstype); |
90135925 | 922 | mutex_unlock(&ls->ls_waiters_mutex); |
e7fd4179 DT |
923 | return error; |
924 | } | |
925 | ||
ef0c2bb0 DT |
926 | /* Handles situations where we might be processing a "fake" or "stub" reply in |
927 | which we can't try to take waiters_mutex again. */ | |
928 | ||
929 | static int remove_from_waiters_ms(struct dlm_lkb *lkb, struct dlm_message *ms) | |
930 | { | |
931 | struct dlm_ls *ls = lkb->lkb_resource->res_ls; | |
932 | int error; | |
933 | ||
934 | if (ms != &ls->ls_stub_ms) | |
935 | mutex_lock(&ls->ls_waiters_mutex); | |
936 | error = _remove_from_waiters(lkb, ms->m_type); | |
937 | if (ms != &ls->ls_stub_ms) | |
938 | mutex_unlock(&ls->ls_waiters_mutex); | |
939 | return error; | |
940 | } | |
941 | ||
e7fd4179 DT |
942 | static void dir_remove(struct dlm_rsb *r) |
943 | { | |
944 | int to_nodeid; | |
945 | ||
946 | if (dlm_no_directory(r->res_ls)) | |
947 | return; | |
948 | ||
949 | to_nodeid = dlm_dir_nodeid(r); | |
950 | if (to_nodeid != dlm_our_nodeid()) | |
951 | send_remove(r); | |
952 | else | |
953 | dlm_dir_remove_entry(r->res_ls, to_nodeid, | |
954 | r->res_name, r->res_length); | |
955 | } | |
956 | ||
957 | /* FIXME: shouldn't this be able to exit as soon as one non-due rsb is | |
958 | found since they are in order of newest to oldest? */ | |
959 | ||
960 | static int shrink_bucket(struct dlm_ls *ls, int b) | |
961 | { | |
962 | struct dlm_rsb *r; | |
963 | int count = 0, found; | |
964 | ||
965 | for (;;) { | |
90135925 | 966 | found = 0; |
e7fd4179 DT |
967 | write_lock(&ls->ls_rsbtbl[b].lock); |
968 | list_for_each_entry_reverse(r, &ls->ls_rsbtbl[b].toss, | |
969 | res_hashchain) { | |
970 | if (!time_after_eq(jiffies, r->res_toss_time + | |
68c817a1 | 971 | dlm_config.ci_toss_secs * HZ)) |
e7fd4179 | 972 | continue; |
90135925 | 973 | found = 1; |
e7fd4179 DT |
974 | break; |
975 | } | |
976 | ||
977 | if (!found) { | |
978 | write_unlock(&ls->ls_rsbtbl[b].lock); | |
979 | break; | |
980 | } | |
981 | ||
982 | if (kref_put(&r->res_ref, kill_rsb)) { | |
983 | list_del(&r->res_hashchain); | |
984 | write_unlock(&ls->ls_rsbtbl[b].lock); | |
985 | ||
986 | if (is_master(r)) | |
987 | dir_remove(r); | |
52bda2b5 | 988 | dlm_free_rsb(r); |
e7fd4179 DT |
989 | count++; |
990 | } else { | |
991 | write_unlock(&ls->ls_rsbtbl[b].lock); | |
992 | log_error(ls, "tossed rsb in use %s", r->res_name); | |
993 | } | |
994 | } | |
995 | ||
996 | return count; | |
997 | } | |
998 | ||
999 | void dlm_scan_rsbs(struct dlm_ls *ls) | |
1000 | { | |
1001 | int i; | |
1002 | ||
e7fd4179 DT |
1003 | for (i = 0; i < ls->ls_rsbtbl_size; i++) { |
1004 | shrink_bucket(ls, i); | |
85e86edf DT |
1005 | if (dlm_locking_stopped(ls)) |
1006 | break; | |
e7fd4179 DT |
1007 | cond_resched(); |
1008 | } | |
1009 | } | |
1010 | ||
3ae1acf9 DT |
1011 | static void add_timeout(struct dlm_lkb *lkb) |
1012 | { | |
1013 | struct dlm_ls *ls = lkb->lkb_resource->res_ls; | |
1014 | ||
84d8cd69 DT |
1015 | if (is_master_copy(lkb)) { |
1016 | lkb->lkb_timestamp = jiffies; | |
3ae1acf9 | 1017 | return; |
84d8cd69 | 1018 | } |
3ae1acf9 DT |
1019 | |
1020 | if (test_bit(LSFL_TIMEWARN, &ls->ls_flags) && | |
1021 | !(lkb->lkb_exflags & DLM_LKF_NODLCKWT)) { | |
1022 | lkb->lkb_flags |= DLM_IFL_WATCH_TIMEWARN; | |
1023 | goto add_it; | |
1024 | } | |
84d8cd69 DT |
1025 | if (lkb->lkb_exflags & DLM_LKF_TIMEOUT) |
1026 | goto add_it; | |
3ae1acf9 DT |
1027 | return; |
1028 | ||
1029 | add_it: | |
1030 | DLM_ASSERT(list_empty(&lkb->lkb_time_list), dlm_print_lkb(lkb);); | |
1031 | mutex_lock(&ls->ls_timeout_mutex); | |
1032 | hold_lkb(lkb); | |
1033 | lkb->lkb_timestamp = jiffies; | |
1034 | list_add_tail(&lkb->lkb_time_list, &ls->ls_timeout); | |
1035 | mutex_unlock(&ls->ls_timeout_mutex); | |
1036 | } | |
1037 | ||
1038 | static void del_timeout(struct dlm_lkb *lkb) | |
1039 | { | |
1040 | struct dlm_ls *ls = lkb->lkb_resource->res_ls; | |
1041 | ||
1042 | mutex_lock(&ls->ls_timeout_mutex); | |
1043 | if (!list_empty(&lkb->lkb_time_list)) { | |
1044 | list_del_init(&lkb->lkb_time_list); | |
1045 | unhold_lkb(lkb); | |
1046 | } | |
1047 | mutex_unlock(&ls->ls_timeout_mutex); | |
1048 | } | |
1049 | ||
1050 | /* FIXME: is it safe to look at lkb_exflags, lkb_flags, lkb_timestamp, and | |
1051 | lkb_lksb_timeout without lock_rsb? Note: we can't lock timeout_mutex | |
1052 | and then lock rsb because of lock ordering in add_timeout. We may need | |
1053 | to specify some special timeout-related bits in the lkb that are just to | |
1054 | be accessed under the timeout_mutex. */ | |
1055 | ||
1056 | void dlm_scan_timeout(struct dlm_ls *ls) | |
1057 | { | |
1058 | struct dlm_rsb *r; | |
1059 | struct dlm_lkb *lkb; | |
1060 | int do_cancel, do_warn; | |
1061 | ||
1062 | for (;;) { | |
1063 | if (dlm_locking_stopped(ls)) | |
1064 | break; | |
1065 | ||
1066 | do_cancel = 0; | |
1067 | do_warn = 0; | |
1068 | mutex_lock(&ls->ls_timeout_mutex); | |
1069 | list_for_each_entry(lkb, &ls->ls_timeout, lkb_time_list) { | |
1070 | ||
1071 | if ((lkb->lkb_exflags & DLM_LKF_TIMEOUT) && | |
1072 | time_after_eq(jiffies, lkb->lkb_timestamp + | |
1073 | lkb->lkb_timeout_cs * HZ/100)) | |
1074 | do_cancel = 1; | |
1075 | ||
1076 | if ((lkb->lkb_flags & DLM_IFL_WATCH_TIMEWARN) && | |
1077 | time_after_eq(jiffies, lkb->lkb_timestamp + | |
1078 | dlm_config.ci_timewarn_cs * HZ/100)) | |
1079 | do_warn = 1; | |
1080 | ||
1081 | if (!do_cancel && !do_warn) | |
1082 | continue; | |
1083 | hold_lkb(lkb); | |
1084 | break; | |
1085 | } | |
1086 | mutex_unlock(&ls->ls_timeout_mutex); | |
1087 | ||
1088 | if (!do_cancel && !do_warn) | |
1089 | break; | |
1090 | ||
1091 | r = lkb->lkb_resource; | |
1092 | hold_rsb(r); | |
1093 | lock_rsb(r); | |
1094 | ||
1095 | if (do_warn) { | |
1096 | /* clear flag so we only warn once */ | |
1097 | lkb->lkb_flags &= ~DLM_IFL_WATCH_TIMEWARN; | |
1098 | if (!(lkb->lkb_exflags & DLM_LKF_TIMEOUT)) | |
1099 | del_timeout(lkb); | |
1100 | dlm_timeout_warn(lkb); | |
1101 | } | |
1102 | ||
1103 | if (do_cancel) { | |
b3cab7b9 | 1104 | log_debug(ls, "timeout cancel %x node %d %s", |
639aca41 | 1105 | lkb->lkb_id, lkb->lkb_nodeid, r->res_name); |
3ae1acf9 DT |
1106 | lkb->lkb_flags &= ~DLM_IFL_WATCH_TIMEWARN; |
1107 | lkb->lkb_flags |= DLM_IFL_TIMEOUT_CANCEL; | |
1108 | del_timeout(lkb); | |
1109 | _cancel_lock(r, lkb); | |
1110 | } | |
1111 | ||
1112 | unlock_rsb(r); | |
1113 | unhold_rsb(r); | |
1114 | dlm_put_lkb(lkb); | |
1115 | } | |
1116 | } | |
1117 | ||
1118 | /* This is only called by dlm_recoverd, and we rely on dlm_ls_stop() stopping | |
1119 | dlm_recoverd before checking/setting ls_recover_begin. */ | |
1120 | ||
1121 | void dlm_adjust_timeouts(struct dlm_ls *ls) | |
1122 | { | |
1123 | struct dlm_lkb *lkb; | |
1124 | long adj = jiffies - ls->ls_recover_begin; | |
1125 | ||
1126 | ls->ls_recover_begin = 0; | |
1127 | mutex_lock(&ls->ls_timeout_mutex); | |
1128 | list_for_each_entry(lkb, &ls->ls_timeout, lkb_time_list) | |
1129 | lkb->lkb_timestamp += adj; | |
1130 | mutex_unlock(&ls->ls_timeout_mutex); | |
1131 | } | |
1132 | ||
e7fd4179 DT |
1133 | /* lkb is master or local copy */ |
1134 | ||
1135 | static void set_lvb_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1136 | { | |
1137 | int b, len = r->res_ls->ls_lvblen; | |
1138 | ||
1139 | /* b=1 lvb returned to caller | |
1140 | b=0 lvb written to rsb or invalidated | |
1141 | b=-1 do nothing */ | |
1142 | ||
1143 | b = dlm_lvb_operations[lkb->lkb_grmode + 1][lkb->lkb_rqmode + 1]; | |
1144 | ||
1145 | if (b == 1) { | |
1146 | if (!lkb->lkb_lvbptr) | |
1147 | return; | |
1148 | ||
1149 | if (!(lkb->lkb_exflags & DLM_LKF_VALBLK)) | |
1150 | return; | |
1151 | ||
1152 | if (!r->res_lvbptr) | |
1153 | return; | |
1154 | ||
1155 | memcpy(lkb->lkb_lvbptr, r->res_lvbptr, len); | |
1156 | lkb->lkb_lvbseq = r->res_lvbseq; | |
1157 | ||
1158 | } else if (b == 0) { | |
1159 | if (lkb->lkb_exflags & DLM_LKF_IVVALBLK) { | |
1160 | rsb_set_flag(r, RSB_VALNOTVALID); | |
1161 | return; | |
1162 | } | |
1163 | ||
1164 | if (!lkb->lkb_lvbptr) | |
1165 | return; | |
1166 | ||
1167 | if (!(lkb->lkb_exflags & DLM_LKF_VALBLK)) | |
1168 | return; | |
1169 | ||
1170 | if (!r->res_lvbptr) | |
52bda2b5 | 1171 | r->res_lvbptr = dlm_allocate_lvb(r->res_ls); |
e7fd4179 DT |
1172 | |
1173 | if (!r->res_lvbptr) | |
1174 | return; | |
1175 | ||
1176 | memcpy(r->res_lvbptr, lkb->lkb_lvbptr, len); | |
1177 | r->res_lvbseq++; | |
1178 | lkb->lkb_lvbseq = r->res_lvbseq; | |
1179 | rsb_clear_flag(r, RSB_VALNOTVALID); | |
1180 | } | |
1181 | ||
1182 | if (rsb_flag(r, RSB_VALNOTVALID)) | |
1183 | lkb->lkb_sbflags |= DLM_SBF_VALNOTVALID; | |
1184 | } | |
1185 | ||
1186 | static void set_lvb_unlock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1187 | { | |
1188 | if (lkb->lkb_grmode < DLM_LOCK_PW) | |
1189 | return; | |
1190 | ||
1191 | if (lkb->lkb_exflags & DLM_LKF_IVVALBLK) { | |
1192 | rsb_set_flag(r, RSB_VALNOTVALID); | |
1193 | return; | |
1194 | } | |
1195 | ||
1196 | if (!lkb->lkb_lvbptr) | |
1197 | return; | |
1198 | ||
1199 | if (!(lkb->lkb_exflags & DLM_LKF_VALBLK)) | |
1200 | return; | |
1201 | ||
1202 | if (!r->res_lvbptr) | |
52bda2b5 | 1203 | r->res_lvbptr = dlm_allocate_lvb(r->res_ls); |
e7fd4179 DT |
1204 | |
1205 | if (!r->res_lvbptr) | |
1206 | return; | |
1207 | ||
1208 | memcpy(r->res_lvbptr, lkb->lkb_lvbptr, r->res_ls->ls_lvblen); | |
1209 | r->res_lvbseq++; | |
1210 | rsb_clear_flag(r, RSB_VALNOTVALID); | |
1211 | } | |
1212 | ||
1213 | /* lkb is process copy (pc) */ | |
1214 | ||
1215 | static void set_lvb_lock_pc(struct dlm_rsb *r, struct dlm_lkb *lkb, | |
1216 | struct dlm_message *ms) | |
1217 | { | |
1218 | int b; | |
1219 | ||
1220 | if (!lkb->lkb_lvbptr) | |
1221 | return; | |
1222 | ||
1223 | if (!(lkb->lkb_exflags & DLM_LKF_VALBLK)) | |
1224 | return; | |
1225 | ||
597d0cae | 1226 | b = dlm_lvb_operations[lkb->lkb_grmode + 1][lkb->lkb_rqmode + 1]; |
e7fd4179 DT |
1227 | if (b == 1) { |
1228 | int len = receive_extralen(ms); | |
a9cc9159 AV |
1229 | if (len > DLM_RESNAME_MAXLEN) |
1230 | len = DLM_RESNAME_MAXLEN; | |
e7fd4179 DT |
1231 | memcpy(lkb->lkb_lvbptr, ms->m_extra, len); |
1232 | lkb->lkb_lvbseq = ms->m_lvbseq; | |
1233 | } | |
1234 | } | |
1235 | ||
1236 | /* Manipulate lkb's on rsb's convert/granted/waiting queues | |
1237 | remove_lock -- used for unlock, removes lkb from granted | |
1238 | revert_lock -- used for cancel, moves lkb from convert to granted | |
1239 | grant_lock -- used for request and convert, adds lkb to granted or | |
1240 | moves lkb from convert or waiting to granted | |
1241 | ||
1242 | Each of these is used for master or local copy lkb's. There is | |
1243 | also a _pc() variation used to make the corresponding change on | |
1244 | a process copy (pc) lkb. */ | |
1245 | ||
1246 | static void _remove_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1247 | { | |
1248 | del_lkb(r, lkb); | |
1249 | lkb->lkb_grmode = DLM_LOCK_IV; | |
1250 | /* this unhold undoes the original ref from create_lkb() | |
1251 | so this leads to the lkb being freed */ | |
1252 | unhold_lkb(lkb); | |
1253 | } | |
1254 | ||
1255 | static void remove_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1256 | { | |
1257 | set_lvb_unlock(r, lkb); | |
1258 | _remove_lock(r, lkb); | |
1259 | } | |
1260 | ||
1261 | static void remove_lock_pc(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1262 | { | |
1263 | _remove_lock(r, lkb); | |
1264 | } | |
1265 | ||
ef0c2bb0 DT |
1266 | /* returns: 0 did nothing |
1267 | 1 moved lock to granted | |
1268 | -1 removed lock */ | |
1269 | ||
1270 | static int revert_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
e7fd4179 | 1271 | { |
ef0c2bb0 DT |
1272 | int rv = 0; |
1273 | ||
e7fd4179 DT |
1274 | lkb->lkb_rqmode = DLM_LOCK_IV; |
1275 | ||
1276 | switch (lkb->lkb_status) { | |
597d0cae DT |
1277 | case DLM_LKSTS_GRANTED: |
1278 | break; | |
e7fd4179 DT |
1279 | case DLM_LKSTS_CONVERT: |
1280 | move_lkb(r, lkb, DLM_LKSTS_GRANTED); | |
ef0c2bb0 | 1281 | rv = 1; |
e7fd4179 DT |
1282 | break; |
1283 | case DLM_LKSTS_WAITING: | |
1284 | del_lkb(r, lkb); | |
1285 | lkb->lkb_grmode = DLM_LOCK_IV; | |
1286 | /* this unhold undoes the original ref from create_lkb() | |
1287 | so this leads to the lkb being freed */ | |
1288 | unhold_lkb(lkb); | |
ef0c2bb0 | 1289 | rv = -1; |
e7fd4179 DT |
1290 | break; |
1291 | default: | |
1292 | log_print("invalid status for revert %d", lkb->lkb_status); | |
1293 | } | |
ef0c2bb0 | 1294 | return rv; |
e7fd4179 DT |
1295 | } |
1296 | ||
ef0c2bb0 | 1297 | static int revert_lock_pc(struct dlm_rsb *r, struct dlm_lkb *lkb) |
e7fd4179 | 1298 | { |
ef0c2bb0 | 1299 | return revert_lock(r, lkb); |
e7fd4179 DT |
1300 | } |
1301 | ||
1302 | static void _grant_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1303 | { | |
1304 | if (lkb->lkb_grmode != lkb->lkb_rqmode) { | |
1305 | lkb->lkb_grmode = lkb->lkb_rqmode; | |
1306 | if (lkb->lkb_status) | |
1307 | move_lkb(r, lkb, DLM_LKSTS_GRANTED); | |
1308 | else | |
1309 | add_lkb(r, lkb, DLM_LKSTS_GRANTED); | |
1310 | } | |
1311 | ||
1312 | lkb->lkb_rqmode = DLM_LOCK_IV; | |
e7fd4179 DT |
1313 | } |
1314 | ||
1315 | static void grant_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1316 | { | |
1317 | set_lvb_lock(r, lkb); | |
1318 | _grant_lock(r, lkb); | |
1319 | lkb->lkb_highbast = 0; | |
1320 | } | |
1321 | ||
1322 | static void grant_lock_pc(struct dlm_rsb *r, struct dlm_lkb *lkb, | |
1323 | struct dlm_message *ms) | |
1324 | { | |
1325 | set_lvb_lock_pc(r, lkb, ms); | |
1326 | _grant_lock(r, lkb); | |
1327 | } | |
1328 | ||
1329 | /* called by grant_pending_locks() which means an async grant message must | |
1330 | be sent to the requesting node in addition to granting the lock if the | |
1331 | lkb belongs to a remote node. */ | |
1332 | ||
1333 | static void grant_lock_pending(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1334 | { | |
1335 | grant_lock(r, lkb); | |
1336 | if (is_master_copy(lkb)) | |
1337 | send_grant(r, lkb); | |
1338 | else | |
1339 | queue_cast(r, lkb, 0); | |
1340 | } | |
1341 | ||
7d3c1feb DT |
1342 | /* The special CONVDEADLK, ALTPR and ALTCW flags allow the master to |
1343 | change the granted/requested modes. We're munging things accordingly in | |
1344 | the process copy. | |
1345 | CONVDEADLK: our grmode may have been forced down to NL to resolve a | |
1346 | conversion deadlock | |
1347 | ALTPR/ALTCW: our rqmode may have been changed to PR or CW to become | |
1348 | compatible with other granted locks */ | |
1349 | ||
1350 | static void munge_demoted(struct dlm_lkb *lkb, struct dlm_message *ms) | |
1351 | { | |
1352 | if (ms->m_type != DLM_MSG_CONVERT_REPLY) { | |
1353 | log_print("munge_demoted %x invalid reply type %d", | |
1354 | lkb->lkb_id, ms->m_type); | |
1355 | return; | |
1356 | } | |
1357 | ||
1358 | if (lkb->lkb_rqmode == DLM_LOCK_IV || lkb->lkb_grmode == DLM_LOCK_IV) { | |
1359 | log_print("munge_demoted %x invalid modes gr %d rq %d", | |
1360 | lkb->lkb_id, lkb->lkb_grmode, lkb->lkb_rqmode); | |
1361 | return; | |
1362 | } | |
1363 | ||
1364 | lkb->lkb_grmode = DLM_LOCK_NL; | |
1365 | } | |
1366 | ||
1367 | static void munge_altmode(struct dlm_lkb *lkb, struct dlm_message *ms) | |
1368 | { | |
1369 | if (ms->m_type != DLM_MSG_REQUEST_REPLY && | |
1370 | ms->m_type != DLM_MSG_GRANT) { | |
1371 | log_print("munge_altmode %x invalid reply type %d", | |
1372 | lkb->lkb_id, ms->m_type); | |
1373 | return; | |
1374 | } | |
1375 | ||
1376 | if (lkb->lkb_exflags & DLM_LKF_ALTPR) | |
1377 | lkb->lkb_rqmode = DLM_LOCK_PR; | |
1378 | else if (lkb->lkb_exflags & DLM_LKF_ALTCW) | |
1379 | lkb->lkb_rqmode = DLM_LOCK_CW; | |
1380 | else { | |
1381 | log_print("munge_altmode invalid exflags %x", lkb->lkb_exflags); | |
1382 | dlm_print_lkb(lkb); | |
1383 | } | |
1384 | } | |
1385 | ||
e7fd4179 DT |
1386 | static inline int first_in_list(struct dlm_lkb *lkb, struct list_head *head) |
1387 | { | |
1388 | struct dlm_lkb *first = list_entry(head->next, struct dlm_lkb, | |
1389 | lkb_statequeue); | |
1390 | if (lkb->lkb_id == first->lkb_id) | |
90135925 | 1391 | return 1; |
e7fd4179 | 1392 | |
90135925 | 1393 | return 0; |
e7fd4179 DT |
1394 | } |
1395 | ||
e7fd4179 DT |
1396 | /* Check if the given lkb conflicts with another lkb on the queue. */ |
1397 | ||
1398 | static int queue_conflict(struct list_head *head, struct dlm_lkb *lkb) | |
1399 | { | |
1400 | struct dlm_lkb *this; | |
1401 | ||
1402 | list_for_each_entry(this, head, lkb_statequeue) { | |
1403 | if (this == lkb) | |
1404 | continue; | |
3bcd3687 | 1405 | if (!modes_compat(this, lkb)) |
90135925 | 1406 | return 1; |
e7fd4179 | 1407 | } |
90135925 | 1408 | return 0; |
e7fd4179 DT |
1409 | } |
1410 | ||
1411 | /* | |
1412 | * "A conversion deadlock arises with a pair of lock requests in the converting | |
1413 | * queue for one resource. The granted mode of each lock blocks the requested | |
1414 | * mode of the other lock." | |
1415 | * | |
c85d65e9 DT |
1416 | * Part 2: if the granted mode of lkb is preventing an earlier lkb in the |
1417 | * convert queue from being granted, then deadlk/demote lkb. | |
e7fd4179 DT |
1418 | * |
1419 | * Example: | |
1420 | * Granted Queue: empty | |
1421 | * Convert Queue: NL->EX (first lock) | |
1422 | * PR->EX (second lock) | |
1423 | * | |
1424 | * The first lock can't be granted because of the granted mode of the second | |
1425 | * lock and the second lock can't be granted because it's not first in the | |
c85d65e9 DT |
1426 | * list. We either cancel lkb's conversion (PR->EX) and return EDEADLK, or we |
1427 | * demote the granted mode of lkb (from PR to NL) if it has the CONVDEADLK | |
1428 | * flag set and return DEMOTED in the lksb flags. | |
e7fd4179 | 1429 | * |
c85d65e9 DT |
1430 | * Originally, this function detected conv-deadlk in a more limited scope: |
1431 | * - if !modes_compat(lkb1, lkb2) && !modes_compat(lkb2, lkb1), or | |
1432 | * - if lkb1 was the first entry in the queue (not just earlier), and was | |
1433 | * blocked by the granted mode of lkb2, and there was nothing on the | |
1434 | * granted queue preventing lkb1 from being granted immediately, i.e. | |
1435 | * lkb2 was the only thing preventing lkb1 from being granted. | |
1436 | * | |
1437 | * That second condition meant we'd only say there was conv-deadlk if | |
1438 | * resolving it (by demotion) would lead to the first lock on the convert | |
1439 | * queue being granted right away. It allowed conversion deadlocks to exist | |
1440 | * between locks on the convert queue while they couldn't be granted anyway. | |
1441 | * | |
1442 | * Now, we detect and take action on conversion deadlocks immediately when | |
1443 | * they're created, even if they may not be immediately consequential. If | |
1444 | * lkb1 exists anywhere in the convert queue and lkb2 comes in with a granted | |
1445 | * mode that would prevent lkb1's conversion from being granted, we do a | |
1446 | * deadlk/demote on lkb2 right away and don't let it onto the convert queue. | |
1447 | * I think this means that the lkb_is_ahead condition below should always | |
1448 | * be zero, i.e. there will never be conv-deadlk between two locks that are | |
1449 | * both already on the convert queue. | |
e7fd4179 DT |
1450 | */ |
1451 | ||
c85d65e9 | 1452 | static int conversion_deadlock_detect(struct dlm_rsb *r, struct dlm_lkb *lkb2) |
e7fd4179 | 1453 | { |
c85d65e9 DT |
1454 | struct dlm_lkb *lkb1; |
1455 | int lkb_is_ahead = 0; | |
e7fd4179 | 1456 | |
c85d65e9 DT |
1457 | list_for_each_entry(lkb1, &r->res_convertqueue, lkb_statequeue) { |
1458 | if (lkb1 == lkb2) { | |
1459 | lkb_is_ahead = 1; | |
e7fd4179 DT |
1460 | continue; |
1461 | } | |
1462 | ||
c85d65e9 DT |
1463 | if (!lkb_is_ahead) { |
1464 | if (!modes_compat(lkb2, lkb1)) | |
1465 | return 1; | |
1466 | } else { | |
1467 | if (!modes_compat(lkb2, lkb1) && | |
1468 | !modes_compat(lkb1, lkb2)) | |
1469 | return 1; | |
1470 | } | |
e7fd4179 | 1471 | } |
90135925 | 1472 | return 0; |
e7fd4179 DT |
1473 | } |
1474 | ||
1475 | /* | |
1476 | * Return 1 if the lock can be granted, 0 otherwise. | |
1477 | * Also detect and resolve conversion deadlocks. | |
1478 | * | |
1479 | * lkb is the lock to be granted | |
1480 | * | |
1481 | * now is 1 if the function is being called in the context of the | |
1482 | * immediate request, it is 0 if called later, after the lock has been | |
1483 | * queued. | |
1484 | * | |
1485 | * References are from chapter 6 of "VAXcluster Principles" by Roy Davis | |
1486 | */ | |
1487 | ||
1488 | static int _can_be_granted(struct dlm_rsb *r, struct dlm_lkb *lkb, int now) | |
1489 | { | |
1490 | int8_t conv = (lkb->lkb_grmode != DLM_LOCK_IV); | |
1491 | ||
1492 | /* | |
1493 | * 6-10: Version 5.4 introduced an option to address the phenomenon of | |
1494 | * a new request for a NL mode lock being blocked. | |
1495 | * | |
1496 | * 6-11: If the optional EXPEDITE flag is used with the new NL mode | |
1497 | * request, then it would be granted. In essence, the use of this flag | |
1498 | * tells the Lock Manager to expedite theis request by not considering | |
1499 | * what may be in the CONVERTING or WAITING queues... As of this | |
1500 | * writing, the EXPEDITE flag can be used only with new requests for NL | |
1501 | * mode locks. This flag is not valid for conversion requests. | |
1502 | * | |
1503 | * A shortcut. Earlier checks return an error if EXPEDITE is used in a | |
1504 | * conversion or used with a non-NL requested mode. We also know an | |
1505 | * EXPEDITE request is always granted immediately, so now must always | |
1506 | * be 1. The full condition to grant an expedite request: (now && | |
1507 | * !conv && lkb->rqmode == DLM_LOCK_NL && (flags & EXPEDITE)) can | |
1508 | * therefore be shortened to just checking the flag. | |
1509 | */ | |
1510 | ||
1511 | if (lkb->lkb_exflags & DLM_LKF_EXPEDITE) | |
90135925 | 1512 | return 1; |
e7fd4179 DT |
1513 | |
1514 | /* | |
1515 | * A shortcut. Without this, !queue_conflict(grantqueue, lkb) would be | |
1516 | * added to the remaining conditions. | |
1517 | */ | |
1518 | ||
1519 | if (queue_conflict(&r->res_grantqueue, lkb)) | |
1520 | goto out; | |
1521 | ||
1522 | /* | |
1523 | * 6-3: By default, a conversion request is immediately granted if the | |
1524 | * requested mode is compatible with the modes of all other granted | |
1525 | * locks | |
1526 | */ | |
1527 | ||
1528 | if (queue_conflict(&r->res_convertqueue, lkb)) | |
1529 | goto out; | |
1530 | ||
1531 | /* | |
1532 | * 6-5: But the default algorithm for deciding whether to grant or | |
1533 | * queue conversion requests does not by itself guarantee that such | |
1534 | * requests are serviced on a "first come first serve" basis. This, in | |
1535 | * turn, can lead to a phenomenon known as "indefinate postponement". | |
1536 | * | |
1537 | * 6-7: This issue is dealt with by using the optional QUECVT flag with | |
1538 | * the system service employed to request a lock conversion. This flag | |
1539 | * forces certain conversion requests to be queued, even if they are | |
1540 | * compatible with the granted modes of other locks on the same | |
1541 | * resource. Thus, the use of this flag results in conversion requests | |
1542 | * being ordered on a "first come first servce" basis. | |
1543 | * | |
1544 | * DCT: This condition is all about new conversions being able to occur | |
1545 | * "in place" while the lock remains on the granted queue (assuming | |
1546 | * nothing else conflicts.) IOW if QUECVT isn't set, a conversion | |
1547 | * doesn't _have_ to go onto the convert queue where it's processed in | |
1548 | * order. The "now" variable is necessary to distinguish converts | |
1549 | * being received and processed for the first time now, because once a | |
1550 | * convert is moved to the conversion queue the condition below applies | |
1551 | * requiring fifo granting. | |
1552 | */ | |
1553 | ||
1554 | if (now && conv && !(lkb->lkb_exflags & DLM_LKF_QUECVT)) | |
90135925 | 1555 | return 1; |
e7fd4179 DT |
1556 | |
1557 | /* | |
3bcd3687 DT |
1558 | * The NOORDER flag is set to avoid the standard vms rules on grant |
1559 | * order. | |
e7fd4179 DT |
1560 | */ |
1561 | ||
1562 | if (lkb->lkb_exflags & DLM_LKF_NOORDER) | |
90135925 | 1563 | return 1; |
e7fd4179 DT |
1564 | |
1565 | /* | |
1566 | * 6-3: Once in that queue [CONVERTING], a conversion request cannot be | |
1567 | * granted until all other conversion requests ahead of it are granted | |
1568 | * and/or canceled. | |
1569 | */ | |
1570 | ||
1571 | if (!now && conv && first_in_list(lkb, &r->res_convertqueue)) | |
90135925 | 1572 | return 1; |
e7fd4179 DT |
1573 | |
1574 | /* | |
1575 | * 6-4: By default, a new request is immediately granted only if all | |
1576 | * three of the following conditions are satisfied when the request is | |
1577 | * issued: | |
1578 | * - The queue of ungranted conversion requests for the resource is | |
1579 | * empty. | |
1580 | * - The queue of ungranted new requests for the resource is empty. | |
1581 | * - The mode of the new request is compatible with the most | |
1582 | * restrictive mode of all granted locks on the resource. | |
1583 | */ | |
1584 | ||
1585 | if (now && !conv && list_empty(&r->res_convertqueue) && | |
1586 | list_empty(&r->res_waitqueue)) | |
90135925 | 1587 | return 1; |
e7fd4179 DT |
1588 | |
1589 | /* | |
1590 | * 6-4: Once a lock request is in the queue of ungranted new requests, | |
1591 | * it cannot be granted until the queue of ungranted conversion | |
1592 | * requests is empty, all ungranted new requests ahead of it are | |
1593 | * granted and/or canceled, and it is compatible with the granted mode | |
1594 | * of the most restrictive lock granted on the resource. | |
1595 | */ | |
1596 | ||
1597 | if (!now && !conv && list_empty(&r->res_convertqueue) && | |
1598 | first_in_list(lkb, &r->res_waitqueue)) | |
90135925 | 1599 | return 1; |
e7fd4179 | 1600 | out: |
90135925 | 1601 | return 0; |
e7fd4179 DT |
1602 | } |
1603 | ||
c85d65e9 DT |
1604 | static int can_be_granted(struct dlm_rsb *r, struct dlm_lkb *lkb, int now, |
1605 | int *err) | |
e7fd4179 | 1606 | { |
e7fd4179 DT |
1607 | int rv; |
1608 | int8_t alt = 0, rqmode = lkb->lkb_rqmode; | |
c85d65e9 DT |
1609 | int8_t is_convert = (lkb->lkb_grmode != DLM_LOCK_IV); |
1610 | ||
1611 | if (err) | |
1612 | *err = 0; | |
e7fd4179 DT |
1613 | |
1614 | rv = _can_be_granted(r, lkb, now); | |
1615 | if (rv) | |
1616 | goto out; | |
1617 | ||
c85d65e9 DT |
1618 | /* |
1619 | * The CONVDEADLK flag is non-standard and tells the dlm to resolve | |
1620 | * conversion deadlocks by demoting grmode to NL, otherwise the dlm | |
1621 | * cancels one of the locks. | |
1622 | */ | |
1623 | ||
1624 | if (is_convert && can_be_queued(lkb) && | |
1625 | conversion_deadlock_detect(r, lkb)) { | |
1626 | if (lkb->lkb_exflags & DLM_LKF_CONVDEADLK) { | |
1627 | lkb->lkb_grmode = DLM_LOCK_NL; | |
1628 | lkb->lkb_sbflags |= DLM_SBF_DEMOTED; | |
1629 | } else if (!(lkb->lkb_exflags & DLM_LKF_NODLCKWT)) { | |
1630 | if (err) | |
1631 | *err = -EDEADLK; | |
1632 | else { | |
1633 | log_print("can_be_granted deadlock %x now %d", | |
1634 | lkb->lkb_id, now); | |
1635 | dlm_dump_rsb(r); | |
1636 | } | |
1637 | } | |
e7fd4179 | 1638 | goto out; |
c85d65e9 | 1639 | } |
e7fd4179 | 1640 | |
c85d65e9 DT |
1641 | /* |
1642 | * The ALTPR and ALTCW flags are non-standard and tell the dlm to try | |
1643 | * to grant a request in a mode other than the normal rqmode. It's a | |
1644 | * simple way to provide a big optimization to applications that can | |
1645 | * use them. | |
1646 | */ | |
1647 | ||
1648 | if (rqmode != DLM_LOCK_PR && (lkb->lkb_exflags & DLM_LKF_ALTPR)) | |
e7fd4179 | 1649 | alt = DLM_LOCK_PR; |
c85d65e9 | 1650 | else if (rqmode != DLM_LOCK_CW && (lkb->lkb_exflags & DLM_LKF_ALTCW)) |
e7fd4179 DT |
1651 | alt = DLM_LOCK_CW; |
1652 | ||
1653 | if (alt) { | |
1654 | lkb->lkb_rqmode = alt; | |
1655 | rv = _can_be_granted(r, lkb, now); | |
1656 | if (rv) | |
1657 | lkb->lkb_sbflags |= DLM_SBF_ALTMODE; | |
1658 | else | |
1659 | lkb->lkb_rqmode = rqmode; | |
1660 | } | |
1661 | out: | |
1662 | return rv; | |
1663 | } | |
1664 | ||
c85d65e9 DT |
1665 | /* FIXME: I don't think that can_be_granted() can/will demote or find deadlock |
1666 | for locks pending on the convert list. Once verified (watch for these | |
1667 | log_prints), we should be able to just call _can_be_granted() and not | |
1668 | bother with the demote/deadlk cases here (and there's no easy way to deal | |
1669 | with a deadlk here, we'd have to generate something like grant_lock with | |
1670 | the deadlk error.) */ | |
1671 | ||
36509258 DT |
1672 | /* Returns the highest requested mode of all blocked conversions; sets |
1673 | cw if there's a blocked conversion to DLM_LOCK_CW. */ | |
c85d65e9 | 1674 | |
36509258 | 1675 | static int grant_pending_convert(struct dlm_rsb *r, int high, int *cw) |
e7fd4179 DT |
1676 | { |
1677 | struct dlm_lkb *lkb, *s; | |
1678 | int hi, demoted, quit, grant_restart, demote_restart; | |
c85d65e9 | 1679 | int deadlk; |
e7fd4179 DT |
1680 | |
1681 | quit = 0; | |
1682 | restart: | |
1683 | grant_restart = 0; | |
1684 | demote_restart = 0; | |
1685 | hi = DLM_LOCK_IV; | |
1686 | ||
1687 | list_for_each_entry_safe(lkb, s, &r->res_convertqueue, lkb_statequeue) { | |
1688 | demoted = is_demoted(lkb); | |
c85d65e9 DT |
1689 | deadlk = 0; |
1690 | ||
1691 | if (can_be_granted(r, lkb, 0, &deadlk)) { | |
e7fd4179 DT |
1692 | grant_lock_pending(r, lkb); |
1693 | grant_restart = 1; | |
c85d65e9 | 1694 | continue; |
e7fd4179 | 1695 | } |
c85d65e9 DT |
1696 | |
1697 | if (!demoted && is_demoted(lkb)) { | |
1698 | log_print("WARN: pending demoted %x node %d %s", | |
1699 | lkb->lkb_id, lkb->lkb_nodeid, r->res_name); | |
1700 | demote_restart = 1; | |
1701 | continue; | |
1702 | } | |
1703 | ||
1704 | if (deadlk) { | |
1705 | log_print("WARN: pending deadlock %x node %d %s", | |
1706 | lkb->lkb_id, lkb->lkb_nodeid, r->res_name); | |
1707 | dlm_dump_rsb(r); | |
1708 | continue; | |
1709 | } | |
1710 | ||
1711 | hi = max_t(int, lkb->lkb_rqmode, hi); | |
36509258 DT |
1712 | |
1713 | if (cw && lkb->lkb_rqmode == DLM_LOCK_CW) | |
1714 | *cw = 1; | |
e7fd4179 DT |
1715 | } |
1716 | ||
1717 | if (grant_restart) | |
1718 | goto restart; | |
1719 | if (demote_restart && !quit) { | |
1720 | quit = 1; | |
1721 | goto restart; | |
1722 | } | |
1723 | ||
1724 | return max_t(int, high, hi); | |
1725 | } | |
1726 | ||
36509258 | 1727 | static int grant_pending_wait(struct dlm_rsb *r, int high, int *cw) |
e7fd4179 DT |
1728 | { |
1729 | struct dlm_lkb *lkb, *s; | |
1730 | ||
1731 | list_for_each_entry_safe(lkb, s, &r->res_waitqueue, lkb_statequeue) { | |
c85d65e9 | 1732 | if (can_be_granted(r, lkb, 0, NULL)) |
e7fd4179 | 1733 | grant_lock_pending(r, lkb); |
36509258 | 1734 | else { |
e7fd4179 | 1735 | high = max_t(int, lkb->lkb_rqmode, high); |
36509258 DT |
1736 | if (lkb->lkb_rqmode == DLM_LOCK_CW) |
1737 | *cw = 1; | |
1738 | } | |
e7fd4179 DT |
1739 | } |
1740 | ||
1741 | return high; | |
1742 | } | |
1743 | ||
36509258 DT |
1744 | /* cw of 1 means there's a lock with a rqmode of DLM_LOCK_CW that's blocked |
1745 | on either the convert or waiting queue. | |
1746 | high is the largest rqmode of all locks blocked on the convert or | |
1747 | waiting queue. */ | |
1748 | ||
1749 | static int lock_requires_bast(struct dlm_lkb *gr, int high, int cw) | |
1750 | { | |
1751 | if (gr->lkb_grmode == DLM_LOCK_PR && cw) { | |
1752 | if (gr->lkb_highbast < DLM_LOCK_EX) | |
1753 | return 1; | |
1754 | return 0; | |
1755 | } | |
1756 | ||
1757 | if (gr->lkb_highbast < high && | |
1758 | !__dlm_compat_matrix[gr->lkb_grmode+1][high+1]) | |
1759 | return 1; | |
1760 | return 0; | |
1761 | } | |
1762 | ||
e7fd4179 DT |
1763 | static void grant_pending_locks(struct dlm_rsb *r) |
1764 | { | |
1765 | struct dlm_lkb *lkb, *s; | |
1766 | int high = DLM_LOCK_IV; | |
36509258 | 1767 | int cw = 0; |
e7fd4179 | 1768 | |
a345da3e | 1769 | DLM_ASSERT(is_master(r), dlm_dump_rsb(r);); |
e7fd4179 | 1770 | |
36509258 DT |
1771 | high = grant_pending_convert(r, high, &cw); |
1772 | high = grant_pending_wait(r, high, &cw); | |
e7fd4179 DT |
1773 | |
1774 | if (high == DLM_LOCK_IV) | |
1775 | return; | |
1776 | ||
1777 | /* | |
1778 | * If there are locks left on the wait/convert queue then send blocking | |
1779 | * ASTs to granted locks based on the largest requested mode (high) | |
36509258 | 1780 | * found above. |
e7fd4179 DT |
1781 | */ |
1782 | ||
1783 | list_for_each_entry_safe(lkb, s, &r->res_grantqueue, lkb_statequeue) { | |
e5dae548 | 1784 | if (lkb->lkb_bastfn && lock_requires_bast(lkb, high, cw)) { |
36509258 DT |
1785 | if (cw && high == DLM_LOCK_PR) |
1786 | queue_bast(r, lkb, DLM_LOCK_CW); | |
1787 | else | |
1788 | queue_bast(r, lkb, high); | |
e7fd4179 DT |
1789 | lkb->lkb_highbast = high; |
1790 | } | |
1791 | } | |
1792 | } | |
1793 | ||
36509258 DT |
1794 | static int modes_require_bast(struct dlm_lkb *gr, struct dlm_lkb *rq) |
1795 | { | |
1796 | if ((gr->lkb_grmode == DLM_LOCK_PR && rq->lkb_rqmode == DLM_LOCK_CW) || | |
1797 | (gr->lkb_grmode == DLM_LOCK_CW && rq->lkb_rqmode == DLM_LOCK_PR)) { | |
1798 | if (gr->lkb_highbast < DLM_LOCK_EX) | |
1799 | return 1; | |
1800 | return 0; | |
1801 | } | |
1802 | ||
1803 | if (gr->lkb_highbast < rq->lkb_rqmode && !modes_compat(gr, rq)) | |
1804 | return 1; | |
1805 | return 0; | |
1806 | } | |
1807 | ||
e7fd4179 DT |
1808 | static void send_bast_queue(struct dlm_rsb *r, struct list_head *head, |
1809 | struct dlm_lkb *lkb) | |
1810 | { | |
1811 | struct dlm_lkb *gr; | |
1812 | ||
1813 | list_for_each_entry(gr, head, lkb_statequeue) { | |
e5dae548 | 1814 | if (gr->lkb_bastfn && modes_require_bast(gr, lkb)) { |
e7fd4179 DT |
1815 | queue_bast(r, gr, lkb->lkb_rqmode); |
1816 | gr->lkb_highbast = lkb->lkb_rqmode; | |
1817 | } | |
1818 | } | |
1819 | } | |
1820 | ||
1821 | static void send_blocking_asts(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1822 | { | |
1823 | send_bast_queue(r, &r->res_grantqueue, lkb); | |
1824 | } | |
1825 | ||
1826 | static void send_blocking_asts_all(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1827 | { | |
1828 | send_bast_queue(r, &r->res_grantqueue, lkb); | |
1829 | send_bast_queue(r, &r->res_convertqueue, lkb); | |
1830 | } | |
1831 | ||
1832 | /* set_master(r, lkb) -- set the master nodeid of a resource | |
1833 | ||
1834 | The purpose of this function is to set the nodeid field in the given | |
1835 | lkb using the nodeid field in the given rsb. If the rsb's nodeid is | |
1836 | known, it can just be copied to the lkb and the function will return | |
1837 | 0. If the rsb's nodeid is _not_ known, it needs to be looked up | |
1838 | before it can be copied to the lkb. | |
1839 | ||
1840 | When the rsb nodeid is being looked up remotely, the initial lkb | |
1841 | causing the lookup is kept on the ls_waiters list waiting for the | |
1842 | lookup reply. Other lkb's waiting for the same rsb lookup are kept | |
1843 | on the rsb's res_lookup list until the master is verified. | |
1844 | ||
1845 | Return values: | |
1846 | 0: nodeid is set in rsb/lkb and the caller should go ahead and use it | |
1847 | 1: the rsb master is not available and the lkb has been placed on | |
1848 | a wait queue | |
1849 | */ | |
1850 | ||
1851 | static int set_master(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1852 | { | |
1853 | struct dlm_ls *ls = r->res_ls; | |
755b5eb8 | 1854 | int i, error, dir_nodeid, ret_nodeid, our_nodeid = dlm_our_nodeid(); |
e7fd4179 DT |
1855 | |
1856 | if (rsb_flag(r, RSB_MASTER_UNCERTAIN)) { | |
1857 | rsb_clear_flag(r, RSB_MASTER_UNCERTAIN); | |
1858 | r->res_first_lkid = lkb->lkb_id; | |
1859 | lkb->lkb_nodeid = r->res_nodeid; | |
1860 | return 0; | |
1861 | } | |
1862 | ||
1863 | if (r->res_first_lkid && r->res_first_lkid != lkb->lkb_id) { | |
1864 | list_add_tail(&lkb->lkb_rsb_lookup, &r->res_lookup); | |
1865 | return 1; | |
1866 | } | |
1867 | ||
1868 | if (r->res_nodeid == 0) { | |
1869 | lkb->lkb_nodeid = 0; | |
1870 | return 0; | |
1871 | } | |
1872 | ||
1873 | if (r->res_nodeid > 0) { | |
1874 | lkb->lkb_nodeid = r->res_nodeid; | |
1875 | return 0; | |
1876 | } | |
1877 | ||
a345da3e | 1878 | DLM_ASSERT(r->res_nodeid == -1, dlm_dump_rsb(r);); |
e7fd4179 DT |
1879 | |
1880 | dir_nodeid = dlm_dir_nodeid(r); | |
1881 | ||
1882 | if (dir_nodeid != our_nodeid) { | |
1883 | r->res_first_lkid = lkb->lkb_id; | |
1884 | send_lookup(r, lkb); | |
1885 | return 1; | |
1886 | } | |
1887 | ||
755b5eb8 | 1888 | for (i = 0; i < 2; i++) { |
e7fd4179 DT |
1889 | /* It's possible for dlm_scand to remove an old rsb for |
1890 | this same resource from the toss list, us to create | |
1891 | a new one, look up the master locally, and find it | |
1892 | already exists just before dlm_scand does the | |
1893 | dir_remove() on the previous rsb. */ | |
1894 | ||
1895 | error = dlm_dir_lookup(ls, our_nodeid, r->res_name, | |
1896 | r->res_length, &ret_nodeid); | |
1897 | if (!error) | |
1898 | break; | |
1899 | log_debug(ls, "dir_lookup error %d %s", error, r->res_name); | |
1900 | schedule(); | |
1901 | } | |
755b5eb8 DT |
1902 | if (error && error != -EEXIST) |
1903 | return error; | |
e7fd4179 DT |
1904 | |
1905 | if (ret_nodeid == our_nodeid) { | |
1906 | r->res_first_lkid = 0; | |
1907 | r->res_nodeid = 0; | |
1908 | lkb->lkb_nodeid = 0; | |
1909 | } else { | |
1910 | r->res_first_lkid = lkb->lkb_id; | |
1911 | r->res_nodeid = ret_nodeid; | |
1912 | lkb->lkb_nodeid = ret_nodeid; | |
1913 | } | |
1914 | return 0; | |
1915 | } | |
1916 | ||
1917 | static void process_lookup_list(struct dlm_rsb *r) | |
1918 | { | |
1919 | struct dlm_lkb *lkb, *safe; | |
1920 | ||
1921 | list_for_each_entry_safe(lkb, safe, &r->res_lookup, lkb_rsb_lookup) { | |
ef0c2bb0 | 1922 | list_del_init(&lkb->lkb_rsb_lookup); |
e7fd4179 DT |
1923 | _request_lock(r, lkb); |
1924 | schedule(); | |
1925 | } | |
1926 | } | |
1927 | ||
1928 | /* confirm_master -- confirm (or deny) an rsb's master nodeid */ | |
1929 | ||
1930 | static void confirm_master(struct dlm_rsb *r, int error) | |
1931 | { | |
1932 | struct dlm_lkb *lkb; | |
1933 | ||
1934 | if (!r->res_first_lkid) | |
1935 | return; | |
1936 | ||
1937 | switch (error) { | |
1938 | case 0: | |
1939 | case -EINPROGRESS: | |
1940 | r->res_first_lkid = 0; | |
1941 | process_lookup_list(r); | |
1942 | break; | |
1943 | ||
1944 | case -EAGAIN: | |
aec64e1b DT |
1945 | case -EBADR: |
1946 | case -ENOTBLK: | |
1947 | /* the remote request failed and won't be retried (it was | |
1948 | a NOQUEUE, or has been canceled/unlocked); make a waiting | |
1949 | lkb the first_lkid */ | |
e7fd4179 DT |
1950 | |
1951 | r->res_first_lkid = 0; | |
1952 | ||
1953 | if (!list_empty(&r->res_lookup)) { | |
1954 | lkb = list_entry(r->res_lookup.next, struct dlm_lkb, | |
1955 | lkb_rsb_lookup); | |
ef0c2bb0 | 1956 | list_del_init(&lkb->lkb_rsb_lookup); |
e7fd4179 DT |
1957 | r->res_first_lkid = lkb->lkb_id; |
1958 | _request_lock(r, lkb); | |
1959 | } else | |
1960 | r->res_nodeid = -1; | |
1961 | break; | |
1962 | ||
1963 | default: | |
1964 | log_error(r->res_ls, "confirm_master unknown error %d", error); | |
1965 | } | |
1966 | } | |
1967 | ||
1968 | static int set_lock_args(int mode, struct dlm_lksb *lksb, uint32_t flags, | |
e5dae548 DT |
1969 | int namelen, unsigned long timeout_cs, |
1970 | void (*ast) (void *astparam), | |
1971 | void *astparam, | |
1972 | void (*bast) (void *astparam, int mode), | |
1973 | struct dlm_args *args) | |
e7fd4179 DT |
1974 | { |
1975 | int rv = -EINVAL; | |
1976 | ||
1977 | /* check for invalid arg usage */ | |
1978 | ||
1979 | if (mode < 0 || mode > DLM_LOCK_EX) | |
1980 | goto out; | |
1981 | ||
1982 | if (!(flags & DLM_LKF_CONVERT) && (namelen > DLM_RESNAME_MAXLEN)) | |
1983 | goto out; | |
1984 | ||
1985 | if (flags & DLM_LKF_CANCEL) | |
1986 | goto out; | |
1987 | ||
1988 | if (flags & DLM_LKF_QUECVT && !(flags & DLM_LKF_CONVERT)) | |
1989 | goto out; | |
1990 | ||
1991 | if (flags & DLM_LKF_CONVDEADLK && !(flags & DLM_LKF_CONVERT)) | |
1992 | goto out; | |
1993 | ||
1994 | if (flags & DLM_LKF_CONVDEADLK && flags & DLM_LKF_NOQUEUE) | |
1995 | goto out; | |
1996 | ||
1997 | if (flags & DLM_LKF_EXPEDITE && flags & DLM_LKF_CONVERT) | |
1998 | goto out; | |
1999 | ||
2000 | if (flags & DLM_LKF_EXPEDITE && flags & DLM_LKF_QUECVT) | |
2001 | goto out; | |
2002 | ||
2003 | if (flags & DLM_LKF_EXPEDITE && flags & DLM_LKF_NOQUEUE) | |
2004 | goto out; | |
2005 | ||
2006 | if (flags & DLM_LKF_EXPEDITE && mode != DLM_LOCK_NL) | |
2007 | goto out; | |
2008 | ||
2009 | if (!ast || !lksb) | |
2010 | goto out; | |
2011 | ||
2012 | if (flags & DLM_LKF_VALBLK && !lksb->sb_lvbptr) | |
2013 | goto out; | |
2014 | ||
e7fd4179 DT |
2015 | if (flags & DLM_LKF_CONVERT && !lksb->sb_lkid) |
2016 | goto out; | |
2017 | ||
2018 | /* these args will be copied to the lkb in validate_lock_args, | |
2019 | it cannot be done now because when converting locks, fields in | |
2020 | an active lkb cannot be modified before locking the rsb */ | |
2021 | ||
2022 | args->flags = flags; | |
e5dae548 DT |
2023 | args->astfn = ast; |
2024 | args->astparam = astparam; | |
2025 | args->bastfn = bast; | |
d7db923e | 2026 | args->timeout = timeout_cs; |
e7fd4179 DT |
2027 | args->mode = mode; |
2028 | args->lksb = lksb; | |
e7fd4179 DT |
2029 | rv = 0; |
2030 | out: | |
2031 | return rv; | |
2032 | } | |
2033 | ||
2034 | static int set_unlock_args(uint32_t flags, void *astarg, struct dlm_args *args) | |
2035 | { | |
2036 | if (flags & ~(DLM_LKF_CANCEL | DLM_LKF_VALBLK | DLM_LKF_IVVALBLK | | |
2037 | DLM_LKF_FORCEUNLOCK)) | |
2038 | return -EINVAL; | |
2039 | ||
ef0c2bb0 DT |
2040 | if (flags & DLM_LKF_CANCEL && flags & DLM_LKF_FORCEUNLOCK) |
2041 | return -EINVAL; | |
2042 | ||
e7fd4179 | 2043 | args->flags = flags; |
e5dae548 | 2044 | args->astparam = astarg; |
e7fd4179 DT |
2045 | return 0; |
2046 | } | |
2047 | ||
2048 | static int validate_lock_args(struct dlm_ls *ls, struct dlm_lkb *lkb, | |
2049 | struct dlm_args *args) | |
2050 | { | |
2051 | int rv = -EINVAL; | |
2052 | ||
2053 | if (args->flags & DLM_LKF_CONVERT) { | |
2054 | if (lkb->lkb_flags & DLM_IFL_MSTCPY) | |
2055 | goto out; | |
2056 | ||
2057 | if (args->flags & DLM_LKF_QUECVT && | |
2058 | !__quecvt_compat_matrix[lkb->lkb_grmode+1][args->mode+1]) | |
2059 | goto out; | |
2060 | ||
2061 | rv = -EBUSY; | |
2062 | if (lkb->lkb_status != DLM_LKSTS_GRANTED) | |
2063 | goto out; | |
2064 | ||
2065 | if (lkb->lkb_wait_type) | |
2066 | goto out; | |
ef0c2bb0 DT |
2067 | |
2068 | if (is_overlap(lkb)) | |
2069 | goto out; | |
e7fd4179 DT |
2070 | } |
2071 | ||
2072 | lkb->lkb_exflags = args->flags; | |
2073 | lkb->lkb_sbflags = 0; | |
e5dae548 | 2074 | lkb->lkb_astfn = args->astfn; |
e7fd4179 | 2075 | lkb->lkb_astparam = args->astparam; |
e5dae548 | 2076 | lkb->lkb_bastfn = args->bastfn; |
e7fd4179 DT |
2077 | lkb->lkb_rqmode = args->mode; |
2078 | lkb->lkb_lksb = args->lksb; | |
2079 | lkb->lkb_lvbptr = args->lksb->sb_lvbptr; | |
2080 | lkb->lkb_ownpid = (int) current->pid; | |
d7db923e | 2081 | lkb->lkb_timeout_cs = args->timeout; |
e7fd4179 DT |
2082 | rv = 0; |
2083 | out: | |
2084 | return rv; | |
2085 | } | |
2086 | ||
ef0c2bb0 DT |
2087 | /* when dlm_unlock() sees -EBUSY with CANCEL/FORCEUNLOCK it returns 0 |
2088 | for success */ | |
2089 | ||
2090 | /* note: it's valid for lkb_nodeid/res_nodeid to be -1 when we get here | |
2091 | because there may be a lookup in progress and it's valid to do | |
2092 | cancel/unlockf on it */ | |
2093 | ||
e7fd4179 DT |
2094 | static int validate_unlock_args(struct dlm_lkb *lkb, struct dlm_args *args) |
2095 | { | |
ef0c2bb0 | 2096 | struct dlm_ls *ls = lkb->lkb_resource->res_ls; |
e7fd4179 DT |
2097 | int rv = -EINVAL; |
2098 | ||
ef0c2bb0 DT |
2099 | if (lkb->lkb_flags & DLM_IFL_MSTCPY) { |
2100 | log_error(ls, "unlock on MSTCPY %x", lkb->lkb_id); | |
2101 | dlm_print_lkb(lkb); | |
e7fd4179 | 2102 | goto out; |
ef0c2bb0 | 2103 | } |
e7fd4179 | 2104 | |
ef0c2bb0 DT |
2105 | /* an lkb may still exist even though the lock is EOL'ed due to a |
2106 | cancel, unlock or failed noqueue request; an app can't use these | |
2107 | locks; return same error as if the lkid had not been found at all */ | |
e7fd4179 | 2108 | |
ef0c2bb0 DT |
2109 | if (lkb->lkb_flags & DLM_IFL_ENDOFLIFE) { |
2110 | log_debug(ls, "unlock on ENDOFLIFE %x", lkb->lkb_id); | |
2111 | rv = -ENOENT; | |
e7fd4179 | 2112 | goto out; |
ef0c2bb0 | 2113 | } |
e7fd4179 | 2114 | |
ef0c2bb0 DT |
2115 | /* an lkb may be waiting for an rsb lookup to complete where the |
2116 | lookup was initiated by another lock */ | |
2117 | ||
42dc1601 DT |
2118 | if (!list_empty(&lkb->lkb_rsb_lookup)) { |
2119 | if (args->flags & (DLM_LKF_CANCEL | DLM_LKF_FORCEUNLOCK)) { | |
ef0c2bb0 DT |
2120 | log_debug(ls, "unlock on rsb_lookup %x", lkb->lkb_id); |
2121 | list_del_init(&lkb->lkb_rsb_lookup); | |
2122 | queue_cast(lkb->lkb_resource, lkb, | |
2123 | args->flags & DLM_LKF_CANCEL ? | |
2124 | -DLM_ECANCEL : -DLM_EUNLOCK); | |
2125 | unhold_lkb(lkb); /* undoes create_lkb() */ | |
ef0c2bb0 | 2126 | } |
42dc1601 DT |
2127 | /* caller changes -EBUSY to 0 for CANCEL and FORCEUNLOCK */ |
2128 | rv = -EBUSY; | |
2129 | goto out; | |
ef0c2bb0 DT |
2130 | } |
2131 | ||
2132 | /* cancel not allowed with another cancel/unlock in progress */ | |
2133 | ||
2134 | if (args->flags & DLM_LKF_CANCEL) { | |
2135 | if (lkb->lkb_exflags & DLM_LKF_CANCEL) | |
2136 | goto out; | |
2137 | ||
2138 | if (is_overlap(lkb)) | |
2139 | goto out; | |
2140 | ||
3ae1acf9 DT |
2141 | /* don't let scand try to do a cancel */ |
2142 | del_timeout(lkb); | |
2143 | ||
ef0c2bb0 DT |
2144 | if (lkb->lkb_flags & DLM_IFL_RESEND) { |
2145 | lkb->lkb_flags |= DLM_IFL_OVERLAP_CANCEL; | |
2146 | rv = -EBUSY; | |
2147 | goto out; | |
2148 | } | |
2149 | ||
2150 | switch (lkb->lkb_wait_type) { | |
2151 | case DLM_MSG_LOOKUP: | |
2152 | case DLM_MSG_REQUEST: | |
2153 | lkb->lkb_flags |= DLM_IFL_OVERLAP_CANCEL; | |
2154 | rv = -EBUSY; | |
2155 | goto out; | |
2156 | case DLM_MSG_UNLOCK: | |
2157 | case DLM_MSG_CANCEL: | |
2158 | goto out; | |
2159 | } | |
2160 | /* add_to_waiters() will set OVERLAP_CANCEL */ | |
2161 | goto out_ok; | |
2162 | } | |
2163 | ||
2164 | /* do we need to allow a force-unlock if there's a normal unlock | |
2165 | already in progress? in what conditions could the normal unlock | |
2166 | fail such that we'd want to send a force-unlock to be sure? */ | |
2167 | ||
2168 | if (args->flags & DLM_LKF_FORCEUNLOCK) { | |
2169 | if (lkb->lkb_exflags & DLM_LKF_FORCEUNLOCK) | |
2170 | goto out; | |
2171 | ||
2172 | if (is_overlap_unlock(lkb)) | |
2173 | goto out; | |
e7fd4179 | 2174 | |
3ae1acf9 DT |
2175 | /* don't let scand try to do a cancel */ |
2176 | del_timeout(lkb); | |
2177 | ||
ef0c2bb0 DT |
2178 | if (lkb->lkb_flags & DLM_IFL_RESEND) { |
2179 | lkb->lkb_flags |= DLM_IFL_OVERLAP_UNLOCK; | |
2180 | rv = -EBUSY; | |
2181 | goto out; | |
2182 | } | |
2183 | ||
2184 | switch (lkb->lkb_wait_type) { | |
2185 | case DLM_MSG_LOOKUP: | |
2186 | case DLM_MSG_REQUEST: | |
2187 | lkb->lkb_flags |= DLM_IFL_OVERLAP_UNLOCK; | |
2188 | rv = -EBUSY; | |
2189 | goto out; | |
2190 | case DLM_MSG_UNLOCK: | |
2191 | goto out; | |
2192 | } | |
2193 | /* add_to_waiters() will set OVERLAP_UNLOCK */ | |
2194 | goto out_ok; | |
2195 | } | |
2196 | ||
2197 | /* normal unlock not allowed if there's any op in progress */ | |
e7fd4179 | 2198 | rv = -EBUSY; |
ef0c2bb0 | 2199 | if (lkb->lkb_wait_type || lkb->lkb_wait_count) |
e7fd4179 DT |
2200 | goto out; |
2201 | ||
2202 | out_ok: | |
ef0c2bb0 DT |
2203 | /* an overlapping op shouldn't blow away exflags from other op */ |
2204 | lkb->lkb_exflags |= args->flags; | |
e7fd4179 DT |
2205 | lkb->lkb_sbflags = 0; |
2206 | lkb->lkb_astparam = args->astparam; | |
e7fd4179 DT |
2207 | rv = 0; |
2208 | out: | |
ef0c2bb0 DT |
2209 | if (rv) |
2210 | log_debug(ls, "validate_unlock_args %d %x %x %x %x %d %s", rv, | |
2211 | lkb->lkb_id, lkb->lkb_flags, lkb->lkb_exflags, | |
2212 | args->flags, lkb->lkb_wait_type, | |
2213 | lkb->lkb_resource->res_name); | |
e7fd4179 DT |
2214 | return rv; |
2215 | } | |
2216 | ||
2217 | /* | |
2218 | * Four stage 4 varieties: | |
2219 | * do_request(), do_convert(), do_unlock(), do_cancel() | |
2220 | * These are called on the master node for the given lock and | |
2221 | * from the central locking logic. | |
2222 | */ | |
2223 | ||
2224 | static int do_request(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2225 | { | |
2226 | int error = 0; | |
2227 | ||
c85d65e9 | 2228 | if (can_be_granted(r, lkb, 1, NULL)) { |
e7fd4179 DT |
2229 | grant_lock(r, lkb); |
2230 | queue_cast(r, lkb, 0); | |
2231 | goto out; | |
2232 | } | |
2233 | ||
2234 | if (can_be_queued(lkb)) { | |
2235 | error = -EINPROGRESS; | |
2236 | add_lkb(r, lkb, DLM_LKSTS_WAITING); | |
2237 | send_blocking_asts(r, lkb); | |
3ae1acf9 | 2238 | add_timeout(lkb); |
e7fd4179 DT |
2239 | goto out; |
2240 | } | |
2241 | ||
2242 | error = -EAGAIN; | |
2243 | if (force_blocking_asts(lkb)) | |
2244 | send_blocking_asts_all(r, lkb); | |
2245 | queue_cast(r, lkb, -EAGAIN); | |
2246 | ||
2247 | out: | |
2248 | return error; | |
2249 | } | |
2250 | ||
2251 | static int do_convert(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2252 | { | |
2253 | int error = 0; | |
c85d65e9 | 2254 | int deadlk = 0; |
e7fd4179 DT |
2255 | |
2256 | /* changing an existing lock may allow others to be granted */ | |
2257 | ||
c85d65e9 | 2258 | if (can_be_granted(r, lkb, 1, &deadlk)) { |
e7fd4179 DT |
2259 | grant_lock(r, lkb); |
2260 | queue_cast(r, lkb, 0); | |
2261 | grant_pending_locks(r); | |
2262 | goto out; | |
2263 | } | |
2264 | ||
c85d65e9 DT |
2265 | /* can_be_granted() detected that this lock would block in a conversion |
2266 | deadlock, so we leave it on the granted queue and return EDEADLK in | |
2267 | the ast for the convert. */ | |
2268 | ||
2269 | if (deadlk) { | |
2270 | /* it's left on the granted queue */ | |
2271 | log_debug(r->res_ls, "deadlock %x node %d sts%d g%d r%d %s", | |
2272 | lkb->lkb_id, lkb->lkb_nodeid, lkb->lkb_status, | |
2273 | lkb->lkb_grmode, lkb->lkb_rqmode, r->res_name); | |
2274 | revert_lock(r, lkb); | |
2275 | queue_cast(r, lkb, -EDEADLK); | |
2276 | error = -EDEADLK; | |
2277 | goto out; | |
2278 | } | |
2279 | ||
7d3c1feb DT |
2280 | /* is_demoted() means the can_be_granted() above set the grmode |
2281 | to NL, and left us on the granted queue. This auto-demotion | |
2282 | (due to CONVDEADLK) might mean other locks, and/or this lock, are | |
2283 | now grantable. We have to try to grant other converting locks | |
2284 | before we try again to grant this one. */ | |
2285 | ||
2286 | if (is_demoted(lkb)) { | |
36509258 | 2287 | grant_pending_convert(r, DLM_LOCK_IV, NULL); |
7d3c1feb DT |
2288 | if (_can_be_granted(r, lkb, 1)) { |
2289 | grant_lock(r, lkb); | |
2290 | queue_cast(r, lkb, 0); | |
e7fd4179 | 2291 | grant_pending_locks(r); |
7d3c1feb DT |
2292 | goto out; |
2293 | } | |
2294 | /* else fall through and move to convert queue */ | |
2295 | } | |
2296 | ||
2297 | if (can_be_queued(lkb)) { | |
e7fd4179 DT |
2298 | error = -EINPROGRESS; |
2299 | del_lkb(r, lkb); | |
2300 | add_lkb(r, lkb, DLM_LKSTS_CONVERT); | |
2301 | send_blocking_asts(r, lkb); | |
3ae1acf9 | 2302 | add_timeout(lkb); |
e7fd4179 DT |
2303 | goto out; |
2304 | } | |
2305 | ||
2306 | error = -EAGAIN; | |
2307 | if (force_blocking_asts(lkb)) | |
2308 | send_blocking_asts_all(r, lkb); | |
2309 | queue_cast(r, lkb, -EAGAIN); | |
2310 | ||
2311 | out: | |
2312 | return error; | |
2313 | } | |
2314 | ||
2315 | static int do_unlock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2316 | { | |
2317 | remove_lock(r, lkb); | |
2318 | queue_cast(r, lkb, -DLM_EUNLOCK); | |
2319 | grant_pending_locks(r); | |
2320 | return -DLM_EUNLOCK; | |
2321 | } | |
2322 | ||
ef0c2bb0 | 2323 | /* returns: 0 did nothing, -DLM_ECANCEL canceled lock */ |
907b9bce | 2324 | |
e7fd4179 DT |
2325 | static int do_cancel(struct dlm_rsb *r, struct dlm_lkb *lkb) |
2326 | { | |
ef0c2bb0 DT |
2327 | int error; |
2328 | ||
2329 | error = revert_lock(r, lkb); | |
2330 | if (error) { | |
2331 | queue_cast(r, lkb, -DLM_ECANCEL); | |
2332 | grant_pending_locks(r); | |
2333 | return -DLM_ECANCEL; | |
2334 | } | |
2335 | return 0; | |
e7fd4179 DT |
2336 | } |
2337 | ||
2338 | /* | |
2339 | * Four stage 3 varieties: | |
2340 | * _request_lock(), _convert_lock(), _unlock_lock(), _cancel_lock() | |
2341 | */ | |
2342 | ||
2343 | /* add a new lkb to a possibly new rsb, called by requesting process */ | |
2344 | ||
2345 | static int _request_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2346 | { | |
2347 | int error; | |
2348 | ||
2349 | /* set_master: sets lkb nodeid from r */ | |
2350 | ||
2351 | error = set_master(r, lkb); | |
2352 | if (error < 0) | |
2353 | goto out; | |
2354 | if (error) { | |
2355 | error = 0; | |
2356 | goto out; | |
2357 | } | |
2358 | ||
2359 | if (is_remote(r)) | |
2360 | /* receive_request() calls do_request() on remote node */ | |
2361 | error = send_request(r, lkb); | |
2362 | else | |
2363 | error = do_request(r, lkb); | |
2364 | out: | |
2365 | return error; | |
2366 | } | |
2367 | ||
3bcd3687 | 2368 | /* change some property of an existing lkb, e.g. mode */ |
e7fd4179 DT |
2369 | |
2370 | static int _convert_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2371 | { | |
2372 | int error; | |
2373 | ||
2374 | if (is_remote(r)) | |
2375 | /* receive_convert() calls do_convert() on remote node */ | |
2376 | error = send_convert(r, lkb); | |
2377 | else | |
2378 | error = do_convert(r, lkb); | |
2379 | ||
2380 | return error; | |
2381 | } | |
2382 | ||
2383 | /* remove an existing lkb from the granted queue */ | |
2384 | ||
2385 | static int _unlock_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2386 | { | |
2387 | int error; | |
2388 | ||
2389 | if (is_remote(r)) | |
2390 | /* receive_unlock() calls do_unlock() on remote node */ | |
2391 | error = send_unlock(r, lkb); | |
2392 | else | |
2393 | error = do_unlock(r, lkb); | |
2394 | ||
2395 | return error; | |
2396 | } | |
2397 | ||
2398 | /* remove an existing lkb from the convert or wait queue */ | |
2399 | ||
2400 | static int _cancel_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2401 | { | |
2402 | int error; | |
2403 | ||
2404 | if (is_remote(r)) | |
2405 | /* receive_cancel() calls do_cancel() on remote node */ | |
2406 | error = send_cancel(r, lkb); | |
2407 | else | |
2408 | error = do_cancel(r, lkb); | |
2409 | ||
2410 | return error; | |
2411 | } | |
2412 | ||
2413 | /* | |
2414 | * Four stage 2 varieties: | |
2415 | * request_lock(), convert_lock(), unlock_lock(), cancel_lock() | |
2416 | */ | |
2417 | ||
2418 | static int request_lock(struct dlm_ls *ls, struct dlm_lkb *lkb, char *name, | |
2419 | int len, struct dlm_args *args) | |
2420 | { | |
2421 | struct dlm_rsb *r; | |
2422 | int error; | |
2423 | ||
2424 | error = validate_lock_args(ls, lkb, args); | |
2425 | if (error) | |
2426 | goto out; | |
2427 | ||
2428 | error = find_rsb(ls, name, len, R_CREATE, &r); | |
2429 | if (error) | |
2430 | goto out; | |
2431 | ||
2432 | lock_rsb(r); | |
2433 | ||
2434 | attach_lkb(r, lkb); | |
2435 | lkb->lkb_lksb->sb_lkid = lkb->lkb_id; | |
2436 | ||
2437 | error = _request_lock(r, lkb); | |
2438 | ||
2439 | unlock_rsb(r); | |
2440 | put_rsb(r); | |
2441 | ||
2442 | out: | |
2443 | return error; | |
2444 | } | |
2445 | ||
2446 | static int convert_lock(struct dlm_ls *ls, struct dlm_lkb *lkb, | |
2447 | struct dlm_args *args) | |
2448 | { | |
2449 | struct dlm_rsb *r; | |
2450 | int error; | |
2451 | ||
2452 | r = lkb->lkb_resource; | |
2453 | ||
2454 | hold_rsb(r); | |
2455 | lock_rsb(r); | |
2456 | ||
2457 | error = validate_lock_args(ls, lkb, args); | |
2458 | if (error) | |
2459 | goto out; | |
2460 | ||
2461 | error = _convert_lock(r, lkb); | |
2462 | out: | |
2463 | unlock_rsb(r); | |
2464 | put_rsb(r); | |
2465 | return error; | |
2466 | } | |
2467 | ||
2468 | static int unlock_lock(struct dlm_ls *ls, struct dlm_lkb *lkb, | |
2469 | struct dlm_args *args) | |
2470 | { | |
2471 | struct dlm_rsb *r; | |
2472 | int error; | |
2473 | ||
2474 | r = lkb->lkb_resource; | |
2475 | ||
2476 | hold_rsb(r); | |
2477 | lock_rsb(r); | |
2478 | ||
2479 | error = validate_unlock_args(lkb, args); | |
2480 | if (error) | |
2481 | goto out; | |
2482 | ||
2483 | error = _unlock_lock(r, lkb); | |
2484 | out: | |
2485 | unlock_rsb(r); | |
2486 | put_rsb(r); | |
2487 | return error; | |
2488 | } | |
2489 | ||
2490 | static int cancel_lock(struct dlm_ls *ls, struct dlm_lkb *lkb, | |
2491 | struct dlm_args *args) | |
2492 | { | |
2493 | struct dlm_rsb *r; | |
2494 | int error; | |
2495 | ||
2496 | r = lkb->lkb_resource; | |
2497 | ||
2498 | hold_rsb(r); | |
2499 | lock_rsb(r); | |
2500 | ||
2501 | error = validate_unlock_args(lkb, args); | |
2502 | if (error) | |
2503 | goto out; | |
2504 | ||
2505 | error = _cancel_lock(r, lkb); | |
2506 | out: | |
2507 | unlock_rsb(r); | |
2508 | put_rsb(r); | |
2509 | return error; | |
2510 | } | |
2511 | ||
2512 | /* | |
2513 | * Two stage 1 varieties: dlm_lock() and dlm_unlock() | |
2514 | */ | |
2515 | ||
2516 | int dlm_lock(dlm_lockspace_t *lockspace, | |
2517 | int mode, | |
2518 | struct dlm_lksb *lksb, | |
2519 | uint32_t flags, | |
2520 | void *name, | |
2521 | unsigned int namelen, | |
2522 | uint32_t parent_lkid, | |
2523 | void (*ast) (void *astarg), | |
2524 | void *astarg, | |
3bcd3687 | 2525 | void (*bast) (void *astarg, int mode)) |
e7fd4179 DT |
2526 | { |
2527 | struct dlm_ls *ls; | |
2528 | struct dlm_lkb *lkb; | |
2529 | struct dlm_args args; | |
2530 | int error, convert = flags & DLM_LKF_CONVERT; | |
2531 | ||
2532 | ls = dlm_find_lockspace_local(lockspace); | |
2533 | if (!ls) | |
2534 | return -EINVAL; | |
2535 | ||
85e86edf | 2536 | dlm_lock_recovery(ls); |
e7fd4179 DT |
2537 | |
2538 | if (convert) | |
2539 | error = find_lkb(ls, lksb->sb_lkid, &lkb); | |
2540 | else | |
2541 | error = create_lkb(ls, &lkb); | |
2542 | ||
2543 | if (error) | |
2544 | goto out; | |
2545 | ||
d7db923e | 2546 | error = set_lock_args(mode, lksb, flags, namelen, 0, ast, |
3bcd3687 | 2547 | astarg, bast, &args); |
e7fd4179 DT |
2548 | if (error) |
2549 | goto out_put; | |
2550 | ||
2551 | if (convert) | |
2552 | error = convert_lock(ls, lkb, &args); | |
2553 | else | |
2554 | error = request_lock(ls, lkb, name, namelen, &args); | |
2555 | ||
2556 | if (error == -EINPROGRESS) | |
2557 | error = 0; | |
2558 | out_put: | |
2559 | if (convert || error) | |
b3f58d8f | 2560 | __put_lkb(ls, lkb); |
c85d65e9 | 2561 | if (error == -EAGAIN || error == -EDEADLK) |
e7fd4179 DT |
2562 | error = 0; |
2563 | out: | |
85e86edf | 2564 | dlm_unlock_recovery(ls); |
e7fd4179 DT |
2565 | dlm_put_lockspace(ls); |
2566 | return error; | |
2567 | } | |
2568 | ||
2569 | int dlm_unlock(dlm_lockspace_t *lockspace, | |
2570 | uint32_t lkid, | |
2571 | uint32_t flags, | |
2572 | struct dlm_lksb *lksb, | |
2573 | void *astarg) | |
2574 | { | |
2575 | struct dlm_ls *ls; | |
2576 | struct dlm_lkb *lkb; | |
2577 | struct dlm_args args; | |
2578 | int error; | |
2579 | ||
2580 | ls = dlm_find_lockspace_local(lockspace); | |
2581 | if (!ls) | |
2582 | return -EINVAL; | |
2583 | ||
85e86edf | 2584 | dlm_lock_recovery(ls); |
e7fd4179 DT |
2585 | |
2586 | error = find_lkb(ls, lkid, &lkb); | |
2587 | if (error) | |
2588 | goto out; | |
2589 | ||
2590 | error = set_unlock_args(flags, astarg, &args); | |
2591 | if (error) | |
2592 | goto out_put; | |
2593 | ||
2594 | if (flags & DLM_LKF_CANCEL) | |
2595 | error = cancel_lock(ls, lkb, &args); | |
2596 | else | |
2597 | error = unlock_lock(ls, lkb, &args); | |
2598 | ||
2599 | if (error == -DLM_EUNLOCK || error == -DLM_ECANCEL) | |
2600 | error = 0; | |
ef0c2bb0 DT |
2601 | if (error == -EBUSY && (flags & (DLM_LKF_CANCEL | DLM_LKF_FORCEUNLOCK))) |
2602 | error = 0; | |
e7fd4179 | 2603 | out_put: |
b3f58d8f | 2604 | dlm_put_lkb(lkb); |
e7fd4179 | 2605 | out: |
85e86edf | 2606 | dlm_unlock_recovery(ls); |
e7fd4179 DT |
2607 | dlm_put_lockspace(ls); |
2608 | return error; | |
2609 | } | |
2610 | ||
2611 | /* | |
2612 | * send/receive routines for remote operations and replies | |
2613 | * | |
2614 | * send_args | |
2615 | * send_common | |
2616 | * send_request receive_request | |
2617 | * send_convert receive_convert | |
2618 | * send_unlock receive_unlock | |
2619 | * send_cancel receive_cancel | |
2620 | * send_grant receive_grant | |
2621 | * send_bast receive_bast | |
2622 | * send_lookup receive_lookup | |
2623 | * send_remove receive_remove | |
2624 | * | |
2625 | * send_common_reply | |
2626 | * receive_request_reply send_request_reply | |
2627 | * receive_convert_reply send_convert_reply | |
2628 | * receive_unlock_reply send_unlock_reply | |
2629 | * receive_cancel_reply send_cancel_reply | |
2630 | * receive_lookup_reply send_lookup_reply | |
2631 | */ | |
2632 | ||
7e4dac33 DT |
2633 | static int _create_message(struct dlm_ls *ls, int mb_len, |
2634 | int to_nodeid, int mstype, | |
2635 | struct dlm_message **ms_ret, | |
2636 | struct dlm_mhandle **mh_ret) | |
e7fd4179 DT |
2637 | { |
2638 | struct dlm_message *ms; | |
2639 | struct dlm_mhandle *mh; | |
2640 | char *mb; | |
e7fd4179 DT |
2641 | |
2642 | /* get_buffer gives us a message handle (mh) that we need to | |
2643 | pass into lowcomms_commit and a message buffer (mb) that we | |
2644 | write our data into */ | |
2645 | ||
44f487a5 | 2646 | mh = dlm_lowcomms_get_buffer(to_nodeid, mb_len, ls->ls_allocation, &mb); |
e7fd4179 DT |
2647 | if (!mh) |
2648 | return -ENOBUFS; | |
2649 | ||
2650 | memset(mb, 0, mb_len); | |
2651 | ||
2652 | ms = (struct dlm_message *) mb; | |
2653 | ||
2654 | ms->m_header.h_version = (DLM_HEADER_MAJOR | DLM_HEADER_MINOR); | |
7e4dac33 | 2655 | ms->m_header.h_lockspace = ls->ls_global_id; |
e7fd4179 DT |
2656 | ms->m_header.h_nodeid = dlm_our_nodeid(); |
2657 | ms->m_header.h_length = mb_len; | |
2658 | ms->m_header.h_cmd = DLM_MSG; | |
2659 | ||
2660 | ms->m_type = mstype; | |
2661 | ||
2662 | *mh_ret = mh; | |
2663 | *ms_ret = ms; | |
2664 | return 0; | |
2665 | } | |
2666 | ||
7e4dac33 DT |
2667 | static int create_message(struct dlm_rsb *r, struct dlm_lkb *lkb, |
2668 | int to_nodeid, int mstype, | |
2669 | struct dlm_message **ms_ret, | |
2670 | struct dlm_mhandle **mh_ret) | |
2671 | { | |
2672 | int mb_len = sizeof(struct dlm_message); | |
2673 | ||
2674 | switch (mstype) { | |
2675 | case DLM_MSG_REQUEST: | |
2676 | case DLM_MSG_LOOKUP: | |
2677 | case DLM_MSG_REMOVE: | |
2678 | mb_len += r->res_length; | |
2679 | break; | |
2680 | case DLM_MSG_CONVERT: | |
2681 | case DLM_MSG_UNLOCK: | |
2682 | case DLM_MSG_REQUEST_REPLY: | |
2683 | case DLM_MSG_CONVERT_REPLY: | |
2684 | case DLM_MSG_GRANT: | |
2685 | if (lkb && lkb->lkb_lvbptr) | |
2686 | mb_len += r->res_ls->ls_lvblen; | |
2687 | break; | |
2688 | } | |
2689 | ||
2690 | return _create_message(r->res_ls, mb_len, to_nodeid, mstype, | |
2691 | ms_ret, mh_ret); | |
2692 | } | |
2693 | ||
e7fd4179 DT |
2694 | /* further lowcomms enhancements or alternate implementations may make |
2695 | the return value from this function useful at some point */ | |
2696 | ||
2697 | static int send_message(struct dlm_mhandle *mh, struct dlm_message *ms) | |
2698 | { | |
2699 | dlm_message_out(ms); | |
2700 | dlm_lowcomms_commit_buffer(mh); | |
2701 | return 0; | |
2702 | } | |
2703 | ||
2704 | static void send_args(struct dlm_rsb *r, struct dlm_lkb *lkb, | |
2705 | struct dlm_message *ms) | |
2706 | { | |
2707 | ms->m_nodeid = lkb->lkb_nodeid; | |
2708 | ms->m_pid = lkb->lkb_ownpid; | |
2709 | ms->m_lkid = lkb->lkb_id; | |
2710 | ms->m_remid = lkb->lkb_remid; | |
2711 | ms->m_exflags = lkb->lkb_exflags; | |
2712 | ms->m_sbflags = lkb->lkb_sbflags; | |
2713 | ms->m_flags = lkb->lkb_flags; | |
2714 | ms->m_lvbseq = lkb->lkb_lvbseq; | |
2715 | ms->m_status = lkb->lkb_status; | |
2716 | ms->m_grmode = lkb->lkb_grmode; | |
2717 | ms->m_rqmode = lkb->lkb_rqmode; | |
2718 | ms->m_hash = r->res_hash; | |
2719 | ||
2720 | /* m_result and m_bastmode are set from function args, | |
2721 | not from lkb fields */ | |
2722 | ||
e5dae548 | 2723 | if (lkb->lkb_bastfn) |
e7fd4179 | 2724 | ms->m_asts |= AST_BAST; |
e5dae548 | 2725 | if (lkb->lkb_astfn) |
e7fd4179 DT |
2726 | ms->m_asts |= AST_COMP; |
2727 | ||
da49f36f DT |
2728 | /* compare with switch in create_message; send_remove() doesn't |
2729 | use send_args() */ | |
e7fd4179 | 2730 | |
da49f36f DT |
2731 | switch (ms->m_type) { |
2732 | case DLM_MSG_REQUEST: | |
2733 | case DLM_MSG_LOOKUP: | |
2734 | memcpy(ms->m_extra, r->res_name, r->res_length); | |
2735 | break; | |
2736 | case DLM_MSG_CONVERT: | |
2737 | case DLM_MSG_UNLOCK: | |
2738 | case DLM_MSG_REQUEST_REPLY: | |
2739 | case DLM_MSG_CONVERT_REPLY: | |
2740 | case DLM_MSG_GRANT: | |
2741 | if (!lkb->lkb_lvbptr) | |
2742 | break; | |
e7fd4179 | 2743 | memcpy(ms->m_extra, lkb->lkb_lvbptr, r->res_ls->ls_lvblen); |
da49f36f DT |
2744 | break; |
2745 | } | |
e7fd4179 DT |
2746 | } |
2747 | ||
2748 | static int send_common(struct dlm_rsb *r, struct dlm_lkb *lkb, int mstype) | |
2749 | { | |
2750 | struct dlm_message *ms; | |
2751 | struct dlm_mhandle *mh; | |
2752 | int to_nodeid, error; | |
2753 | ||
ef0c2bb0 DT |
2754 | error = add_to_waiters(lkb, mstype); |
2755 | if (error) | |
2756 | return error; | |
e7fd4179 DT |
2757 | |
2758 | to_nodeid = r->res_nodeid; | |
2759 | ||
2760 | error = create_message(r, lkb, to_nodeid, mstype, &ms, &mh); | |
2761 | if (error) | |
2762 | goto fail; | |
2763 | ||
2764 | send_args(r, lkb, ms); | |
2765 | ||
2766 | error = send_message(mh, ms); | |
2767 | if (error) | |
2768 | goto fail; | |
2769 | return 0; | |
2770 | ||
2771 | fail: | |
ef0c2bb0 | 2772 | remove_from_waiters(lkb, msg_reply_type(mstype)); |
e7fd4179 DT |
2773 | return error; |
2774 | } | |
2775 | ||
2776 | static int send_request(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2777 | { | |
2778 | return send_common(r, lkb, DLM_MSG_REQUEST); | |
2779 | } | |
2780 | ||
2781 | static int send_convert(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2782 | { | |
2783 | int error; | |
2784 | ||
2785 | error = send_common(r, lkb, DLM_MSG_CONVERT); | |
2786 | ||
2787 | /* down conversions go without a reply from the master */ | |
2788 | if (!error && down_conversion(lkb)) { | |
ef0c2bb0 DT |
2789 | remove_from_waiters(lkb, DLM_MSG_CONVERT_REPLY); |
2790 | r->res_ls->ls_stub_ms.m_type = DLM_MSG_CONVERT_REPLY; | |
e7fd4179 | 2791 | r->res_ls->ls_stub_ms.m_result = 0; |
32f105a1 | 2792 | r->res_ls->ls_stub_ms.m_flags = lkb->lkb_flags; |
e7fd4179 DT |
2793 | __receive_convert_reply(r, lkb, &r->res_ls->ls_stub_ms); |
2794 | } | |
2795 | ||
2796 | return error; | |
2797 | } | |
2798 | ||
2799 | /* FIXME: if this lkb is the only lock we hold on the rsb, then set | |
2800 | MASTER_UNCERTAIN to force the next request on the rsb to confirm | |
2801 | that the master is still correct. */ | |
2802 | ||
2803 | static int send_unlock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2804 | { | |
2805 | return send_common(r, lkb, DLM_MSG_UNLOCK); | |
2806 | } | |
2807 | ||
2808 | static int send_cancel(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2809 | { | |
2810 | return send_common(r, lkb, DLM_MSG_CANCEL); | |
2811 | } | |
2812 | ||
2813 | static int send_grant(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2814 | { | |
2815 | struct dlm_message *ms; | |
2816 | struct dlm_mhandle *mh; | |
2817 | int to_nodeid, error; | |
2818 | ||
2819 | to_nodeid = lkb->lkb_nodeid; | |
2820 | ||
2821 | error = create_message(r, lkb, to_nodeid, DLM_MSG_GRANT, &ms, &mh); | |
2822 | if (error) | |
2823 | goto out; | |
2824 | ||
2825 | send_args(r, lkb, ms); | |
2826 | ||
2827 | ms->m_result = 0; | |
2828 | ||
2829 | error = send_message(mh, ms); | |
2830 | out: | |
2831 | return error; | |
2832 | } | |
2833 | ||
2834 | static int send_bast(struct dlm_rsb *r, struct dlm_lkb *lkb, int mode) | |
2835 | { | |
2836 | struct dlm_message *ms; | |
2837 | struct dlm_mhandle *mh; | |
2838 | int to_nodeid, error; | |
2839 | ||
2840 | to_nodeid = lkb->lkb_nodeid; | |
2841 | ||
2842 | error = create_message(r, NULL, to_nodeid, DLM_MSG_BAST, &ms, &mh); | |
2843 | if (error) | |
2844 | goto out; | |
2845 | ||
2846 | send_args(r, lkb, ms); | |
2847 | ||
2848 | ms->m_bastmode = mode; | |
2849 | ||
2850 | error = send_message(mh, ms); | |
2851 | out: | |
2852 | return error; | |
2853 | } | |
2854 | ||
2855 | static int send_lookup(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2856 | { | |
2857 | struct dlm_message *ms; | |
2858 | struct dlm_mhandle *mh; | |
2859 | int to_nodeid, error; | |
2860 | ||
ef0c2bb0 DT |
2861 | error = add_to_waiters(lkb, DLM_MSG_LOOKUP); |
2862 | if (error) | |
2863 | return error; | |
e7fd4179 DT |
2864 | |
2865 | to_nodeid = dlm_dir_nodeid(r); | |
2866 | ||
2867 | error = create_message(r, NULL, to_nodeid, DLM_MSG_LOOKUP, &ms, &mh); | |
2868 | if (error) | |
2869 | goto fail; | |
2870 | ||
2871 | send_args(r, lkb, ms); | |
2872 | ||
2873 | error = send_message(mh, ms); | |
2874 | if (error) | |
2875 | goto fail; | |
2876 | return 0; | |
2877 | ||
2878 | fail: | |
ef0c2bb0 | 2879 | remove_from_waiters(lkb, DLM_MSG_LOOKUP_REPLY); |
e7fd4179 DT |
2880 | return error; |
2881 | } | |
2882 | ||
2883 | static int send_remove(struct dlm_rsb *r) | |
2884 | { | |
2885 | struct dlm_message *ms; | |
2886 | struct dlm_mhandle *mh; | |
2887 | int to_nodeid, error; | |
2888 | ||
2889 | to_nodeid = dlm_dir_nodeid(r); | |
2890 | ||
2891 | error = create_message(r, NULL, to_nodeid, DLM_MSG_REMOVE, &ms, &mh); | |
2892 | if (error) | |
2893 | goto out; | |
2894 | ||
2895 | memcpy(ms->m_extra, r->res_name, r->res_length); | |
2896 | ms->m_hash = r->res_hash; | |
2897 | ||
2898 | error = send_message(mh, ms); | |
2899 | out: | |
2900 | return error; | |
2901 | } | |
2902 | ||
2903 | static int send_common_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, | |
2904 | int mstype, int rv) | |
2905 | { | |
2906 | struct dlm_message *ms; | |
2907 | struct dlm_mhandle *mh; | |
2908 | int to_nodeid, error; | |
2909 | ||
2910 | to_nodeid = lkb->lkb_nodeid; | |
2911 | ||
2912 | error = create_message(r, lkb, to_nodeid, mstype, &ms, &mh); | |
2913 | if (error) | |
2914 | goto out; | |
2915 | ||
2916 | send_args(r, lkb, ms); | |
2917 | ||
2918 | ms->m_result = rv; | |
2919 | ||
2920 | error = send_message(mh, ms); | |
2921 | out: | |
2922 | return error; | |
2923 | } | |
2924 | ||
2925 | static int send_request_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv) | |
2926 | { | |
2927 | return send_common_reply(r, lkb, DLM_MSG_REQUEST_REPLY, rv); | |
2928 | } | |
2929 | ||
2930 | static int send_convert_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv) | |
2931 | { | |
2932 | return send_common_reply(r, lkb, DLM_MSG_CONVERT_REPLY, rv); | |
2933 | } | |
2934 | ||
2935 | static int send_unlock_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv) | |
2936 | { | |
2937 | return send_common_reply(r, lkb, DLM_MSG_UNLOCK_REPLY, rv); | |
2938 | } | |
2939 | ||
2940 | static int send_cancel_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv) | |
2941 | { | |
2942 | return send_common_reply(r, lkb, DLM_MSG_CANCEL_REPLY, rv); | |
2943 | } | |
2944 | ||
2945 | static int send_lookup_reply(struct dlm_ls *ls, struct dlm_message *ms_in, | |
2946 | int ret_nodeid, int rv) | |
2947 | { | |
2948 | struct dlm_rsb *r = &ls->ls_stub_rsb; | |
2949 | struct dlm_message *ms; | |
2950 | struct dlm_mhandle *mh; | |
2951 | int error, nodeid = ms_in->m_header.h_nodeid; | |
2952 | ||
2953 | error = create_message(r, NULL, nodeid, DLM_MSG_LOOKUP_REPLY, &ms, &mh); | |
2954 | if (error) | |
2955 | goto out; | |
2956 | ||
2957 | ms->m_lkid = ms_in->m_lkid; | |
2958 | ms->m_result = rv; | |
2959 | ms->m_nodeid = ret_nodeid; | |
2960 | ||
2961 | error = send_message(mh, ms); | |
2962 | out: | |
2963 | return error; | |
2964 | } | |
2965 | ||
2966 | /* which args we save from a received message depends heavily on the type | |
2967 | of message, unlike the send side where we can safely send everything about | |
2968 | the lkb for any type of message */ | |
2969 | ||
2970 | static void receive_flags(struct dlm_lkb *lkb, struct dlm_message *ms) | |
2971 | { | |
2972 | lkb->lkb_exflags = ms->m_exflags; | |
6f90a8b1 | 2973 | lkb->lkb_sbflags = ms->m_sbflags; |
e7fd4179 DT |
2974 | lkb->lkb_flags = (lkb->lkb_flags & 0xFFFF0000) | |
2975 | (ms->m_flags & 0x0000FFFF); | |
2976 | } | |
2977 | ||
2978 | static void receive_flags_reply(struct dlm_lkb *lkb, struct dlm_message *ms) | |
2979 | { | |
2980 | lkb->lkb_sbflags = ms->m_sbflags; | |
2981 | lkb->lkb_flags = (lkb->lkb_flags & 0xFFFF0000) | | |
2982 | (ms->m_flags & 0x0000FFFF); | |
2983 | } | |
2984 | ||
2985 | static int receive_extralen(struct dlm_message *ms) | |
2986 | { | |
2987 | return (ms->m_header.h_length - sizeof(struct dlm_message)); | |
2988 | } | |
2989 | ||
e7fd4179 DT |
2990 | static int receive_lvb(struct dlm_ls *ls, struct dlm_lkb *lkb, |
2991 | struct dlm_message *ms) | |
2992 | { | |
2993 | int len; | |
2994 | ||
2995 | if (lkb->lkb_exflags & DLM_LKF_VALBLK) { | |
2996 | if (!lkb->lkb_lvbptr) | |
52bda2b5 | 2997 | lkb->lkb_lvbptr = dlm_allocate_lvb(ls); |
e7fd4179 DT |
2998 | if (!lkb->lkb_lvbptr) |
2999 | return -ENOMEM; | |
3000 | len = receive_extralen(ms); | |
a9cc9159 AV |
3001 | if (len > DLM_RESNAME_MAXLEN) |
3002 | len = DLM_RESNAME_MAXLEN; | |
e7fd4179 DT |
3003 | memcpy(lkb->lkb_lvbptr, ms->m_extra, len); |
3004 | } | |
3005 | return 0; | |
3006 | } | |
3007 | ||
e5dae548 DT |
3008 | static void fake_bastfn(void *astparam, int mode) |
3009 | { | |
3010 | log_print("fake_bastfn should not be called"); | |
3011 | } | |
3012 | ||
3013 | static void fake_astfn(void *astparam) | |
3014 | { | |
3015 | log_print("fake_astfn should not be called"); | |
3016 | } | |
3017 | ||
e7fd4179 DT |
3018 | static int receive_request_args(struct dlm_ls *ls, struct dlm_lkb *lkb, |
3019 | struct dlm_message *ms) | |
3020 | { | |
3021 | lkb->lkb_nodeid = ms->m_header.h_nodeid; | |
3022 | lkb->lkb_ownpid = ms->m_pid; | |
3023 | lkb->lkb_remid = ms->m_lkid; | |
3024 | lkb->lkb_grmode = DLM_LOCK_IV; | |
3025 | lkb->lkb_rqmode = ms->m_rqmode; | |
e5dae548 DT |
3026 | |
3027 | lkb->lkb_bastfn = (ms->m_asts & AST_BAST) ? &fake_bastfn : NULL; | |
3028 | lkb->lkb_astfn = (ms->m_asts & AST_COMP) ? &fake_astfn : NULL; | |
e7fd4179 | 3029 | |
8d07fd50 DT |
3030 | if (lkb->lkb_exflags & DLM_LKF_VALBLK) { |
3031 | /* lkb was just created so there won't be an lvb yet */ | |
52bda2b5 | 3032 | lkb->lkb_lvbptr = dlm_allocate_lvb(ls); |
8d07fd50 DT |
3033 | if (!lkb->lkb_lvbptr) |
3034 | return -ENOMEM; | |
3035 | } | |
e7fd4179 DT |
3036 | |
3037 | return 0; | |
3038 | } | |
3039 | ||
3040 | static int receive_convert_args(struct dlm_ls *ls, struct dlm_lkb *lkb, | |
3041 | struct dlm_message *ms) | |
3042 | { | |
e7fd4179 DT |
3043 | if (lkb->lkb_status != DLM_LKSTS_GRANTED) |
3044 | return -EBUSY; | |
3045 | ||
e7fd4179 DT |
3046 | if (receive_lvb(ls, lkb, ms)) |
3047 | return -ENOMEM; | |
3048 | ||
3049 | lkb->lkb_rqmode = ms->m_rqmode; | |
3050 | lkb->lkb_lvbseq = ms->m_lvbseq; | |
3051 | ||
3052 | return 0; | |
3053 | } | |
3054 | ||
3055 | static int receive_unlock_args(struct dlm_ls *ls, struct dlm_lkb *lkb, | |
3056 | struct dlm_message *ms) | |
3057 | { | |
e7fd4179 DT |
3058 | if (receive_lvb(ls, lkb, ms)) |
3059 | return -ENOMEM; | |
3060 | return 0; | |
3061 | } | |
3062 | ||
3063 | /* We fill in the stub-lkb fields with the info that send_xxxx_reply() | |
3064 | uses to send a reply and that the remote end uses to process the reply. */ | |
3065 | ||
3066 | static void setup_stub_lkb(struct dlm_ls *ls, struct dlm_message *ms) | |
3067 | { | |
3068 | struct dlm_lkb *lkb = &ls->ls_stub_lkb; | |
3069 | lkb->lkb_nodeid = ms->m_header.h_nodeid; | |
3070 | lkb->lkb_remid = ms->m_lkid; | |
3071 | } | |
3072 | ||
c54e04b0 DT |
3073 | /* This is called after the rsb is locked so that we can safely inspect |
3074 | fields in the lkb. */ | |
3075 | ||
3076 | static int validate_message(struct dlm_lkb *lkb, struct dlm_message *ms) | |
3077 | { | |
3078 | int from = ms->m_header.h_nodeid; | |
3079 | int error = 0; | |
3080 | ||
3081 | switch (ms->m_type) { | |
3082 | case DLM_MSG_CONVERT: | |
3083 | case DLM_MSG_UNLOCK: | |
3084 | case DLM_MSG_CANCEL: | |
3085 | if (!is_master_copy(lkb) || lkb->lkb_nodeid != from) | |
3086 | error = -EINVAL; | |
3087 | break; | |
3088 | ||
3089 | case DLM_MSG_CONVERT_REPLY: | |
3090 | case DLM_MSG_UNLOCK_REPLY: | |
3091 | case DLM_MSG_CANCEL_REPLY: | |
3092 | case DLM_MSG_GRANT: | |
3093 | case DLM_MSG_BAST: | |
3094 | if (!is_process_copy(lkb) || lkb->lkb_nodeid != from) | |
3095 | error = -EINVAL; | |
3096 | break; | |
3097 | ||
3098 | case DLM_MSG_REQUEST_REPLY: | |
3099 | if (!is_process_copy(lkb)) | |
3100 | error = -EINVAL; | |
3101 | else if (lkb->lkb_nodeid != -1 && lkb->lkb_nodeid != from) | |
3102 | error = -EINVAL; | |
3103 | break; | |
3104 | ||
3105 | default: | |
3106 | error = -EINVAL; | |
3107 | } | |
3108 | ||
3109 | if (error) | |
3110 | log_error(lkb->lkb_resource->res_ls, | |
3111 | "ignore invalid message %d from %d %x %x %x %d", | |
3112 | ms->m_type, from, lkb->lkb_id, lkb->lkb_remid, | |
3113 | lkb->lkb_flags, lkb->lkb_nodeid); | |
3114 | return error; | |
3115 | } | |
3116 | ||
e7fd4179 DT |
3117 | static void receive_request(struct dlm_ls *ls, struct dlm_message *ms) |
3118 | { | |
3119 | struct dlm_lkb *lkb; | |
3120 | struct dlm_rsb *r; | |
3121 | int error, namelen; | |
3122 | ||
3123 | error = create_lkb(ls, &lkb); | |
3124 | if (error) | |
3125 | goto fail; | |
3126 | ||
3127 | receive_flags(lkb, ms); | |
3128 | lkb->lkb_flags |= DLM_IFL_MSTCPY; | |
3129 | error = receive_request_args(ls, lkb, ms); | |
3130 | if (error) { | |
b3f58d8f | 3131 | __put_lkb(ls, lkb); |
e7fd4179 DT |
3132 | goto fail; |
3133 | } | |
3134 | ||
3135 | namelen = receive_extralen(ms); | |
3136 | ||
3137 | error = find_rsb(ls, ms->m_extra, namelen, R_MASTER, &r); | |
3138 | if (error) { | |
b3f58d8f | 3139 | __put_lkb(ls, lkb); |
e7fd4179 DT |
3140 | goto fail; |
3141 | } | |
3142 | ||
3143 | lock_rsb(r); | |
3144 | ||
3145 | attach_lkb(r, lkb); | |
3146 | error = do_request(r, lkb); | |
3147 | send_request_reply(r, lkb, error); | |
3148 | ||
3149 | unlock_rsb(r); | |
3150 | put_rsb(r); | |
3151 | ||
3152 | if (error == -EINPROGRESS) | |
3153 | error = 0; | |
3154 | if (error) | |
b3f58d8f | 3155 | dlm_put_lkb(lkb); |
e7fd4179 DT |
3156 | return; |
3157 | ||
3158 | fail: | |
3159 | setup_stub_lkb(ls, ms); | |
3160 | send_request_reply(&ls->ls_stub_rsb, &ls->ls_stub_lkb, error); | |
3161 | } | |
3162 | ||
3163 | static void receive_convert(struct dlm_ls *ls, struct dlm_message *ms) | |
3164 | { | |
3165 | struct dlm_lkb *lkb; | |
3166 | struct dlm_rsb *r; | |
90135925 | 3167 | int error, reply = 1; |
e7fd4179 DT |
3168 | |
3169 | error = find_lkb(ls, ms->m_remid, &lkb); | |
3170 | if (error) | |
3171 | goto fail; | |
3172 | ||
3173 | r = lkb->lkb_resource; | |
3174 | ||
3175 | hold_rsb(r); | |
3176 | lock_rsb(r); | |
3177 | ||
c54e04b0 DT |
3178 | error = validate_message(lkb, ms); |
3179 | if (error) | |
3180 | goto out; | |
3181 | ||
e7fd4179 DT |
3182 | receive_flags(lkb, ms); |
3183 | error = receive_convert_args(ls, lkb, ms); | |
3184 | if (error) | |
c54e04b0 | 3185 | goto out_reply; |
e7fd4179 DT |
3186 | reply = !down_conversion(lkb); |
3187 | ||
3188 | error = do_convert(r, lkb); | |
c54e04b0 | 3189 | out_reply: |
e7fd4179 DT |
3190 | if (reply) |
3191 | send_convert_reply(r, lkb, error); | |
c54e04b0 | 3192 | out: |
e7fd4179 DT |
3193 | unlock_rsb(r); |
3194 | put_rsb(r); | |
b3f58d8f | 3195 | dlm_put_lkb(lkb); |
e7fd4179 DT |
3196 | return; |
3197 | ||
3198 | fail: | |
3199 | setup_stub_lkb(ls, ms); | |
3200 | send_convert_reply(&ls->ls_stub_rsb, &ls->ls_stub_lkb, error); | |
3201 | } | |
3202 | ||
3203 | static void receive_unlock(struct dlm_ls *ls, struct dlm_message *ms) | |
3204 | { | |
3205 | struct dlm_lkb *lkb; | |
3206 | struct dlm_rsb *r; | |
3207 | int error; | |
3208 | ||
3209 | error = find_lkb(ls, ms->m_remid, &lkb); | |
3210 | if (error) | |
3211 | goto fail; | |
3212 | ||
3213 | r = lkb->lkb_resource; | |
3214 | ||
3215 | hold_rsb(r); | |
3216 | lock_rsb(r); | |
3217 | ||
c54e04b0 DT |
3218 | error = validate_message(lkb, ms); |
3219 | if (error) | |
3220 | goto out; | |
3221 | ||
e7fd4179 DT |
3222 | receive_flags(lkb, ms); |
3223 | error = receive_unlock_args(ls, lkb, ms); | |
3224 | if (error) | |
c54e04b0 | 3225 | goto out_reply; |
e7fd4179 DT |
3226 | |
3227 | error = do_unlock(r, lkb); | |
c54e04b0 | 3228 | out_reply: |
e7fd4179 | 3229 | send_unlock_reply(r, lkb, error); |
c54e04b0 | 3230 | out: |
e7fd4179 DT |
3231 | unlock_rsb(r); |
3232 | put_rsb(r); | |
b3f58d8f | 3233 | dlm_put_lkb(lkb); |
e7fd4179 DT |
3234 | return; |
3235 | ||
3236 | fail: | |
3237 | setup_stub_lkb(ls, ms); | |
3238 | send_unlock_reply(&ls->ls_stub_rsb, &ls->ls_stub_lkb, error); | |
3239 | } | |
3240 | ||
3241 | static void receive_cancel(struct dlm_ls *ls, struct dlm_message *ms) | |
3242 | { | |
3243 | struct dlm_lkb *lkb; | |
3244 | struct dlm_rsb *r; | |
3245 | int error; | |
3246 | ||
3247 | error = find_lkb(ls, ms->m_remid, &lkb); | |
3248 | if (error) | |
3249 | goto fail; | |
3250 | ||
3251 | receive_flags(lkb, ms); | |
3252 | ||
3253 | r = lkb->lkb_resource; | |
3254 | ||
3255 | hold_rsb(r); | |
3256 | lock_rsb(r); | |
3257 | ||
c54e04b0 DT |
3258 | error = validate_message(lkb, ms); |
3259 | if (error) | |
3260 | goto out; | |
3261 | ||
e7fd4179 DT |
3262 | error = do_cancel(r, lkb); |
3263 | send_cancel_reply(r, lkb, error); | |
c54e04b0 | 3264 | out: |
e7fd4179 DT |
3265 | unlock_rsb(r); |
3266 | put_rsb(r); | |
b3f58d8f | 3267 | dlm_put_lkb(lkb); |
e7fd4179 DT |
3268 | return; |
3269 | ||
3270 | fail: | |
3271 | setup_stub_lkb(ls, ms); | |
3272 | send_cancel_reply(&ls->ls_stub_rsb, &ls->ls_stub_lkb, error); | |
3273 | } | |
3274 | ||
3275 | static void receive_grant(struct dlm_ls *ls, struct dlm_message *ms) | |
3276 | { | |
3277 | struct dlm_lkb *lkb; | |
3278 | struct dlm_rsb *r; | |
3279 | int error; | |
3280 | ||
3281 | error = find_lkb(ls, ms->m_remid, &lkb); | |
3282 | if (error) { | |
c54e04b0 DT |
3283 | log_debug(ls, "receive_grant from %d no lkb %x", |
3284 | ms->m_header.h_nodeid, ms->m_remid); | |
e7fd4179 DT |
3285 | return; |
3286 | } | |
e7fd4179 DT |
3287 | |
3288 | r = lkb->lkb_resource; | |
3289 | ||
3290 | hold_rsb(r); | |
3291 | lock_rsb(r); | |
3292 | ||
c54e04b0 DT |
3293 | error = validate_message(lkb, ms); |
3294 | if (error) | |
3295 | goto out; | |
3296 | ||
e7fd4179 | 3297 | receive_flags_reply(lkb, ms); |
7d3c1feb DT |
3298 | if (is_altmode(lkb)) |
3299 | munge_altmode(lkb, ms); | |
e7fd4179 DT |
3300 | grant_lock_pc(r, lkb, ms); |
3301 | queue_cast(r, lkb, 0); | |
c54e04b0 | 3302 | out: |
e7fd4179 DT |
3303 | unlock_rsb(r); |
3304 | put_rsb(r); | |
b3f58d8f | 3305 | dlm_put_lkb(lkb); |
e7fd4179 DT |
3306 | } |
3307 | ||
3308 | static void receive_bast(struct dlm_ls *ls, struct dlm_message *ms) | |
3309 | { | |
3310 | struct dlm_lkb *lkb; | |
3311 | struct dlm_rsb *r; | |
3312 | int error; | |
3313 | ||
3314 | error = find_lkb(ls, ms->m_remid, &lkb); | |
3315 | if (error) { | |
c54e04b0 DT |
3316 | log_debug(ls, "receive_bast from %d no lkb %x", |
3317 | ms->m_header.h_nodeid, ms->m_remid); | |
e7fd4179 DT |
3318 | return; |
3319 | } | |
e7fd4179 DT |
3320 | |
3321 | r = lkb->lkb_resource; | |
3322 | ||
3323 | hold_rsb(r); | |
3324 | lock_rsb(r); | |
3325 | ||
c54e04b0 DT |
3326 | error = validate_message(lkb, ms); |
3327 | if (error) | |
3328 | goto out; | |
e7fd4179 | 3329 | |
c54e04b0 DT |
3330 | queue_bast(r, lkb, ms->m_bastmode); |
3331 | out: | |
e7fd4179 DT |
3332 | unlock_rsb(r); |
3333 | put_rsb(r); | |
b3f58d8f | 3334 | dlm_put_lkb(lkb); |
e7fd4179 DT |
3335 | } |
3336 | ||
3337 | static void receive_lookup(struct dlm_ls *ls, struct dlm_message *ms) | |
3338 | { | |
3339 | int len, error, ret_nodeid, dir_nodeid, from_nodeid, our_nodeid; | |
3340 | ||
3341 | from_nodeid = ms->m_header.h_nodeid; | |
3342 | our_nodeid = dlm_our_nodeid(); | |
3343 | ||
3344 | len = receive_extralen(ms); | |
3345 | ||
3346 | dir_nodeid = dlm_hash2nodeid(ls, ms->m_hash); | |
3347 | if (dir_nodeid != our_nodeid) { | |
3348 | log_error(ls, "lookup dir_nodeid %d from %d", | |
3349 | dir_nodeid, from_nodeid); | |
3350 | error = -EINVAL; | |
3351 | ret_nodeid = -1; | |
3352 | goto out; | |
3353 | } | |
3354 | ||
3355 | error = dlm_dir_lookup(ls, from_nodeid, ms->m_extra, len, &ret_nodeid); | |
3356 | ||
3357 | /* Optimization: we're master so treat lookup as a request */ | |
3358 | if (!error && ret_nodeid == our_nodeid) { | |
3359 | receive_request(ls, ms); | |
3360 | return; | |
3361 | } | |
3362 | out: | |
3363 | send_lookup_reply(ls, ms, ret_nodeid, error); | |
3364 | } | |
3365 | ||
3366 | static void receive_remove(struct dlm_ls *ls, struct dlm_message *ms) | |
3367 | { | |
3368 | int len, dir_nodeid, from_nodeid; | |
3369 | ||
3370 | from_nodeid = ms->m_header.h_nodeid; | |
3371 | ||
3372 | len = receive_extralen(ms); | |
3373 | ||
3374 | dir_nodeid = dlm_hash2nodeid(ls, ms->m_hash); | |
3375 | if (dir_nodeid != dlm_our_nodeid()) { | |
3376 | log_error(ls, "remove dir entry dir_nodeid %d from %d", | |
3377 | dir_nodeid, from_nodeid); | |
3378 | return; | |
3379 | } | |
3380 | ||
3381 | dlm_dir_remove_entry(ls, from_nodeid, ms->m_extra, len); | |
3382 | } | |
3383 | ||
8499137d DT |
3384 | static void receive_purge(struct dlm_ls *ls, struct dlm_message *ms) |
3385 | { | |
3386 | do_purge(ls, ms->m_nodeid, ms->m_pid); | |
3387 | } | |
3388 | ||
e7fd4179 DT |
3389 | static void receive_request_reply(struct dlm_ls *ls, struct dlm_message *ms) |
3390 | { | |
3391 | struct dlm_lkb *lkb; | |
3392 | struct dlm_rsb *r; | |
ef0c2bb0 | 3393 | int error, mstype, result; |
e7fd4179 DT |
3394 | |
3395 | error = find_lkb(ls, ms->m_remid, &lkb); | |
3396 | if (error) { | |
c54e04b0 DT |
3397 | log_debug(ls, "receive_request_reply from %d no lkb %x", |
3398 | ms->m_header.h_nodeid, ms->m_remid); | |
e7fd4179 DT |
3399 | return; |
3400 | } | |
e7fd4179 | 3401 | |
e7fd4179 DT |
3402 | r = lkb->lkb_resource; |
3403 | hold_rsb(r); | |
3404 | lock_rsb(r); | |
3405 | ||
c54e04b0 DT |
3406 | error = validate_message(lkb, ms); |
3407 | if (error) | |
3408 | goto out; | |
3409 | ||
ef0c2bb0 DT |
3410 | mstype = lkb->lkb_wait_type; |
3411 | error = remove_from_waiters(lkb, DLM_MSG_REQUEST_REPLY); | |
3412 | if (error) | |
3413 | goto out; | |
3414 | ||
e7fd4179 DT |
3415 | /* Optimization: the dir node was also the master, so it took our |
3416 | lookup as a request and sent request reply instead of lookup reply */ | |
3417 | if (mstype == DLM_MSG_LOOKUP) { | |
3418 | r->res_nodeid = ms->m_header.h_nodeid; | |
3419 | lkb->lkb_nodeid = r->res_nodeid; | |
3420 | } | |
3421 | ||
ef0c2bb0 DT |
3422 | /* this is the value returned from do_request() on the master */ |
3423 | result = ms->m_result; | |
3424 | ||
3425 | switch (result) { | |
e7fd4179 | 3426 | case -EAGAIN: |
ef0c2bb0 | 3427 | /* request would block (be queued) on remote master */ |
e7fd4179 DT |
3428 | queue_cast(r, lkb, -EAGAIN); |
3429 | confirm_master(r, -EAGAIN); | |
ef0c2bb0 | 3430 | unhold_lkb(lkb); /* undoes create_lkb() */ |
e7fd4179 DT |
3431 | break; |
3432 | ||
3433 | case -EINPROGRESS: | |
3434 | case 0: | |
3435 | /* request was queued or granted on remote master */ | |
3436 | receive_flags_reply(lkb, ms); | |
3437 | lkb->lkb_remid = ms->m_lkid; | |
7d3c1feb DT |
3438 | if (is_altmode(lkb)) |
3439 | munge_altmode(lkb, ms); | |
3ae1acf9 | 3440 | if (result) { |
e7fd4179 | 3441 | add_lkb(r, lkb, DLM_LKSTS_WAITING); |
3ae1acf9 DT |
3442 | add_timeout(lkb); |
3443 | } else { | |
e7fd4179 DT |
3444 | grant_lock_pc(r, lkb, ms); |
3445 | queue_cast(r, lkb, 0); | |
3446 | } | |
ef0c2bb0 | 3447 | confirm_master(r, result); |
e7fd4179 DT |
3448 | break; |
3449 | ||
597d0cae | 3450 | case -EBADR: |
e7fd4179 DT |
3451 | case -ENOTBLK: |
3452 | /* find_rsb failed to find rsb or rsb wasn't master */ | |
ef0c2bb0 DT |
3453 | log_debug(ls, "receive_request_reply %x %x master diff %d %d", |
3454 | lkb->lkb_id, lkb->lkb_flags, r->res_nodeid, result); | |
e7fd4179 DT |
3455 | r->res_nodeid = -1; |
3456 | lkb->lkb_nodeid = -1; | |
ef0c2bb0 DT |
3457 | |
3458 | if (is_overlap(lkb)) { | |
3459 | /* we'll ignore error in cancel/unlock reply */ | |
3460 | queue_cast_overlap(r, lkb); | |
aec64e1b | 3461 | confirm_master(r, result); |
ef0c2bb0 DT |
3462 | unhold_lkb(lkb); /* undoes create_lkb() */ |
3463 | } else | |
3464 | _request_lock(r, lkb); | |
e7fd4179 DT |
3465 | break; |
3466 | ||
3467 | default: | |
ef0c2bb0 DT |
3468 | log_error(ls, "receive_request_reply %x error %d", |
3469 | lkb->lkb_id, result); | |
e7fd4179 DT |
3470 | } |
3471 | ||
ef0c2bb0 DT |
3472 | if (is_overlap_unlock(lkb) && (result == 0 || result == -EINPROGRESS)) { |
3473 | log_debug(ls, "receive_request_reply %x result %d unlock", | |
3474 | lkb->lkb_id, result); | |
3475 | lkb->lkb_flags &= ~DLM_IFL_OVERLAP_UNLOCK; | |
3476 | lkb->lkb_flags &= ~DLM_IFL_OVERLAP_CANCEL; | |
3477 | send_unlock(r, lkb); | |
3478 | } else if (is_overlap_cancel(lkb) && (result == -EINPROGRESS)) { | |
3479 | log_debug(ls, "receive_request_reply %x cancel", lkb->lkb_id); | |
3480 | lkb->lkb_flags &= ~DLM_IFL_OVERLAP_UNLOCK; | |
3481 | lkb->lkb_flags &= ~DLM_IFL_OVERLAP_CANCEL; | |
3482 | send_cancel(r, lkb); | |
3483 | } else { | |
3484 | lkb->lkb_flags &= ~DLM_IFL_OVERLAP_CANCEL; | |
3485 | lkb->lkb_flags &= ~DLM_IFL_OVERLAP_UNLOCK; | |
3486 | } | |
3487 | out: | |
e7fd4179 DT |
3488 | unlock_rsb(r); |
3489 | put_rsb(r); | |
b3f58d8f | 3490 | dlm_put_lkb(lkb); |
e7fd4179 DT |
3491 | } |
3492 | ||
3493 | static void __receive_convert_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, | |
3494 | struct dlm_message *ms) | |
3495 | { | |
e7fd4179 | 3496 | /* this is the value returned from do_convert() on the master */ |
ef0c2bb0 | 3497 | switch (ms->m_result) { |
e7fd4179 DT |
3498 | case -EAGAIN: |
3499 | /* convert would block (be queued) on remote master */ | |
3500 | queue_cast(r, lkb, -EAGAIN); | |
3501 | break; | |
3502 | ||
c85d65e9 DT |
3503 | case -EDEADLK: |
3504 | receive_flags_reply(lkb, ms); | |
3505 | revert_lock_pc(r, lkb); | |
3506 | queue_cast(r, lkb, -EDEADLK); | |
3507 | break; | |
3508 | ||
e7fd4179 DT |
3509 | case -EINPROGRESS: |
3510 | /* convert was queued on remote master */ | |
7d3c1feb DT |
3511 | receive_flags_reply(lkb, ms); |
3512 | if (is_demoted(lkb)) | |
3513 | munge_demoted(lkb, ms); | |
e7fd4179 DT |
3514 | del_lkb(r, lkb); |
3515 | add_lkb(r, lkb, DLM_LKSTS_CONVERT); | |
3ae1acf9 | 3516 | add_timeout(lkb); |
e7fd4179 DT |
3517 | break; |
3518 | ||
3519 | case 0: | |
3520 | /* convert was granted on remote master */ | |
3521 | receive_flags_reply(lkb, ms); | |
7d3c1feb DT |
3522 | if (is_demoted(lkb)) |
3523 | munge_demoted(lkb, ms); | |
e7fd4179 DT |
3524 | grant_lock_pc(r, lkb, ms); |
3525 | queue_cast(r, lkb, 0); | |
3526 | break; | |
3527 | ||
3528 | default: | |
ef0c2bb0 DT |
3529 | log_error(r->res_ls, "receive_convert_reply %x error %d", |
3530 | lkb->lkb_id, ms->m_result); | |
e7fd4179 DT |
3531 | } |
3532 | } | |
3533 | ||
3534 | static void _receive_convert_reply(struct dlm_lkb *lkb, struct dlm_message *ms) | |
3535 | { | |
3536 | struct dlm_rsb *r = lkb->lkb_resource; | |
ef0c2bb0 | 3537 | int error; |
e7fd4179 DT |
3538 | |
3539 | hold_rsb(r); | |
3540 | lock_rsb(r); | |
3541 | ||
c54e04b0 DT |
3542 | error = validate_message(lkb, ms); |
3543 | if (error) | |
3544 | goto out; | |
3545 | ||
ef0c2bb0 DT |
3546 | /* stub reply can happen with waiters_mutex held */ |
3547 | error = remove_from_waiters_ms(lkb, ms); | |
3548 | if (error) | |
3549 | goto out; | |
e7fd4179 | 3550 | |
ef0c2bb0 DT |
3551 | __receive_convert_reply(r, lkb, ms); |
3552 | out: | |
e7fd4179 DT |
3553 | unlock_rsb(r); |
3554 | put_rsb(r); | |
3555 | } | |
3556 | ||
3557 | static void receive_convert_reply(struct dlm_ls *ls, struct dlm_message *ms) | |
3558 | { | |
3559 | struct dlm_lkb *lkb; | |
3560 | int error; | |
3561 | ||
3562 | error = find_lkb(ls, ms->m_remid, &lkb); | |
3563 | if (error) { | |
c54e04b0 DT |
3564 | log_debug(ls, "receive_convert_reply from %d no lkb %x", |
3565 | ms->m_header.h_nodeid, ms->m_remid); | |
e7fd4179 DT |
3566 | return; |
3567 | } | |
e7fd4179 | 3568 | |
e7fd4179 | 3569 | _receive_convert_reply(lkb, ms); |
b3f58d8f | 3570 | dlm_put_lkb(lkb); |
e7fd4179 DT |
3571 | } |
3572 | ||
3573 | static void _receive_unlock_reply(struct dlm_lkb *lkb, struct dlm_message *ms) | |
3574 | { | |
3575 | struct dlm_rsb *r = lkb->lkb_resource; | |
ef0c2bb0 | 3576 | int error; |
e7fd4179 DT |
3577 | |
3578 | hold_rsb(r); | |
3579 | lock_rsb(r); | |
3580 | ||
c54e04b0 DT |
3581 | error = validate_message(lkb, ms); |
3582 | if (error) | |
3583 | goto out; | |
3584 | ||
ef0c2bb0 DT |
3585 | /* stub reply can happen with waiters_mutex held */ |
3586 | error = remove_from_waiters_ms(lkb, ms); | |
3587 | if (error) | |
3588 | goto out; | |
3589 | ||
e7fd4179 DT |
3590 | /* this is the value returned from do_unlock() on the master */ |
3591 | ||
ef0c2bb0 | 3592 | switch (ms->m_result) { |
e7fd4179 DT |
3593 | case -DLM_EUNLOCK: |
3594 | receive_flags_reply(lkb, ms); | |
3595 | remove_lock_pc(r, lkb); | |
3596 | queue_cast(r, lkb, -DLM_EUNLOCK); | |
3597 | break; | |
ef0c2bb0 DT |
3598 | case -ENOENT: |
3599 | break; | |
e7fd4179 | 3600 | default: |
ef0c2bb0 DT |
3601 | log_error(r->res_ls, "receive_unlock_reply %x error %d", |
3602 | lkb->lkb_id, ms->m_result); | |
e7fd4179 | 3603 | } |
ef0c2bb0 | 3604 | out: |
e7fd4179 DT |
3605 | unlock_rsb(r); |
3606 | put_rsb(r); | |
3607 | } | |
3608 | ||
3609 | static void receive_unlock_reply(struct dlm_ls *ls, struct dlm_message *ms) | |
3610 | { | |
3611 | struct dlm_lkb *lkb; | |
3612 | int error; | |
3613 | ||
3614 | error = find_lkb(ls, ms->m_remid, &lkb); | |
3615 | if (error) { | |
c54e04b0 DT |
3616 | log_debug(ls, "receive_unlock_reply from %d no lkb %x", |
3617 | ms->m_header.h_nodeid, ms->m_remid); | |
e7fd4179 DT |
3618 | return; |
3619 | } | |
e7fd4179 | 3620 | |
e7fd4179 | 3621 | _receive_unlock_reply(lkb, ms); |
b3f58d8f | 3622 | dlm_put_lkb(lkb); |
e7fd4179 DT |
3623 | } |
3624 | ||
3625 | static void _receive_cancel_reply(struct dlm_lkb *lkb, struct dlm_message *ms) | |
3626 | { | |
3627 | struct dlm_rsb *r = lkb->lkb_resource; | |
ef0c2bb0 | 3628 | int error; |
e7fd4179 DT |
3629 | |
3630 | hold_rsb(r); | |
3631 | lock_rsb(r); | |
3632 | ||
c54e04b0 DT |
3633 | error = validate_message(lkb, ms); |
3634 | if (error) | |
3635 | goto out; | |
3636 | ||
ef0c2bb0 DT |
3637 | /* stub reply can happen with waiters_mutex held */ |
3638 | error = remove_from_waiters_ms(lkb, ms); | |
3639 | if (error) | |
3640 | goto out; | |
3641 | ||
e7fd4179 DT |
3642 | /* this is the value returned from do_cancel() on the master */ |
3643 | ||
ef0c2bb0 | 3644 | switch (ms->m_result) { |
e7fd4179 DT |
3645 | case -DLM_ECANCEL: |
3646 | receive_flags_reply(lkb, ms); | |
3647 | revert_lock_pc(r, lkb); | |
84d8cd69 | 3648 | queue_cast(r, lkb, -DLM_ECANCEL); |
ef0c2bb0 DT |
3649 | break; |
3650 | case 0: | |
e7fd4179 DT |
3651 | break; |
3652 | default: | |
ef0c2bb0 DT |
3653 | log_error(r->res_ls, "receive_cancel_reply %x error %d", |
3654 | lkb->lkb_id, ms->m_result); | |
e7fd4179 | 3655 | } |
ef0c2bb0 | 3656 | out: |
e7fd4179 DT |
3657 | unlock_rsb(r); |
3658 | put_rsb(r); | |
3659 | } | |
3660 | ||
3661 | static void receive_cancel_reply(struct dlm_ls *ls, struct dlm_message *ms) | |
3662 | { | |
3663 | struct dlm_lkb *lkb; | |
3664 | int error; | |
3665 | ||
3666 | error = find_lkb(ls, ms->m_remid, &lkb); | |
3667 | if (error) { | |
c54e04b0 DT |
3668 | log_debug(ls, "receive_cancel_reply from %d no lkb %x", |
3669 | ms->m_header.h_nodeid, ms->m_remid); | |
e7fd4179 DT |
3670 | return; |
3671 | } | |
e7fd4179 | 3672 | |
e7fd4179 | 3673 | _receive_cancel_reply(lkb, ms); |
b3f58d8f | 3674 | dlm_put_lkb(lkb); |
e7fd4179 DT |
3675 | } |
3676 | ||
3677 | static void receive_lookup_reply(struct dlm_ls *ls, struct dlm_message *ms) | |
3678 | { | |
3679 | struct dlm_lkb *lkb; | |
3680 | struct dlm_rsb *r; | |
3681 | int error, ret_nodeid; | |
3682 | ||
3683 | error = find_lkb(ls, ms->m_lkid, &lkb); | |
3684 | if (error) { | |
3685 | log_error(ls, "receive_lookup_reply no lkb"); | |
3686 | return; | |
3687 | } | |
3688 | ||
ef0c2bb0 | 3689 | /* ms->m_result is the value returned by dlm_dir_lookup on dir node |
e7fd4179 | 3690 | FIXME: will a non-zero error ever be returned? */ |
e7fd4179 DT |
3691 | |
3692 | r = lkb->lkb_resource; | |
3693 | hold_rsb(r); | |
3694 | lock_rsb(r); | |
3695 | ||
ef0c2bb0 DT |
3696 | error = remove_from_waiters(lkb, DLM_MSG_LOOKUP_REPLY); |
3697 | if (error) | |
3698 | goto out; | |
3699 | ||
e7fd4179 DT |
3700 | ret_nodeid = ms->m_nodeid; |
3701 | if (ret_nodeid == dlm_our_nodeid()) { | |
3702 | r->res_nodeid = 0; | |
3703 | ret_nodeid = 0; | |
3704 | r->res_first_lkid = 0; | |
3705 | } else { | |
3706 | /* set_master() will copy res_nodeid to lkb_nodeid */ | |
3707 | r->res_nodeid = ret_nodeid; | |
3708 | } | |
3709 | ||
ef0c2bb0 DT |
3710 | if (is_overlap(lkb)) { |
3711 | log_debug(ls, "receive_lookup_reply %x unlock %x", | |
3712 | lkb->lkb_id, lkb->lkb_flags); | |
3713 | queue_cast_overlap(r, lkb); | |
3714 | unhold_lkb(lkb); /* undoes create_lkb() */ | |
3715 | goto out_list; | |
3716 | } | |
3717 | ||
e7fd4179 DT |
3718 | _request_lock(r, lkb); |
3719 | ||
ef0c2bb0 | 3720 | out_list: |
e7fd4179 DT |
3721 | if (!ret_nodeid) |
3722 | process_lookup_list(r); | |
ef0c2bb0 | 3723 | out: |
e7fd4179 DT |
3724 | unlock_rsb(r); |
3725 | put_rsb(r); | |
b3f58d8f | 3726 | dlm_put_lkb(lkb); |
e7fd4179 DT |
3727 | } |
3728 | ||
c36258b5 | 3729 | static void _receive_message(struct dlm_ls *ls, struct dlm_message *ms) |
e7fd4179 | 3730 | { |
46b43eed DT |
3731 | if (!dlm_is_member(ls, ms->m_header.h_nodeid)) { |
3732 | log_debug(ls, "ignore non-member message %d from %d %x %x %d", | |
3733 | ms->m_type, ms->m_header.h_nodeid, ms->m_lkid, | |
3734 | ms->m_remid, ms->m_result); | |
3735 | return; | |
3736 | } | |
3737 | ||
e7fd4179 DT |
3738 | switch (ms->m_type) { |
3739 | ||
3740 | /* messages sent to a master node */ | |
3741 | ||
3742 | case DLM_MSG_REQUEST: | |
3743 | receive_request(ls, ms); | |
3744 | break; | |
3745 | ||
3746 | case DLM_MSG_CONVERT: | |
3747 | receive_convert(ls, ms); | |
3748 | break; | |
3749 | ||
3750 | case DLM_MSG_UNLOCK: | |
3751 | receive_unlock(ls, ms); | |
3752 | break; | |
3753 | ||
3754 | case DLM_MSG_CANCEL: | |
3755 | receive_cancel(ls, ms); | |
3756 | break; | |
3757 | ||
3758 | /* messages sent from a master node (replies to above) */ | |
3759 | ||
3760 | case DLM_MSG_REQUEST_REPLY: | |
3761 | receive_request_reply(ls, ms); | |
3762 | break; | |
3763 | ||
3764 | case DLM_MSG_CONVERT_REPLY: | |
3765 | receive_convert_reply(ls, ms); | |
3766 | break; | |
3767 | ||
3768 | case DLM_MSG_UNLOCK_REPLY: | |
3769 | receive_unlock_reply(ls, ms); | |
3770 | break; | |
3771 | ||
3772 | case DLM_MSG_CANCEL_REPLY: | |
3773 | receive_cancel_reply(ls, ms); | |
3774 | break; | |
3775 | ||
3776 | /* messages sent from a master node (only two types of async msg) */ | |
3777 | ||
3778 | case DLM_MSG_GRANT: | |
3779 | receive_grant(ls, ms); | |
3780 | break; | |
3781 | ||
3782 | case DLM_MSG_BAST: | |
3783 | receive_bast(ls, ms); | |
3784 | break; | |
3785 | ||
3786 | /* messages sent to a dir node */ | |
3787 | ||
3788 | case DLM_MSG_LOOKUP: | |
3789 | receive_lookup(ls, ms); | |
3790 | break; | |
3791 | ||
3792 | case DLM_MSG_REMOVE: | |
3793 | receive_remove(ls, ms); | |
3794 | break; | |
3795 | ||
3796 | /* messages sent from a dir node (remove has no reply) */ | |
3797 | ||
3798 | case DLM_MSG_LOOKUP_REPLY: | |
3799 | receive_lookup_reply(ls, ms); | |
3800 | break; | |
3801 | ||
8499137d DT |
3802 | /* other messages */ |
3803 | ||
3804 | case DLM_MSG_PURGE: | |
3805 | receive_purge(ls, ms); | |
3806 | break; | |
3807 | ||
e7fd4179 DT |
3808 | default: |
3809 | log_error(ls, "unknown message type %d", ms->m_type); | |
3810 | } | |
3811 | ||
e7fd4179 | 3812 | dlm_astd_wake(); |
e7fd4179 DT |
3813 | } |
3814 | ||
c36258b5 DT |
3815 | /* If the lockspace is in recovery mode (locking stopped), then normal |
3816 | messages are saved on the requestqueue for processing after recovery is | |
3817 | done. When not in recovery mode, we wait for dlm_recoverd to drain saved | |
3818 | messages off the requestqueue before we process new ones. This occurs right | |
3819 | after recovery completes when we transition from saving all messages on | |
3820 | requestqueue, to processing all the saved messages, to processing new | |
3821 | messages as they arrive. */ | |
e7fd4179 | 3822 | |
c36258b5 DT |
3823 | static void dlm_receive_message(struct dlm_ls *ls, struct dlm_message *ms, |
3824 | int nodeid) | |
3825 | { | |
3826 | if (dlm_locking_stopped(ls)) { | |
8b0d8e03 | 3827 | dlm_add_requestqueue(ls, nodeid, ms); |
c36258b5 DT |
3828 | } else { |
3829 | dlm_wait_requestqueue(ls); | |
3830 | _receive_message(ls, ms); | |
3831 | } | |
3832 | } | |
3833 | ||
3834 | /* This is called by dlm_recoverd to process messages that were saved on | |
3835 | the requestqueue. */ | |
3836 | ||
3837 | void dlm_receive_message_saved(struct dlm_ls *ls, struct dlm_message *ms) | |
3838 | { | |
3839 | _receive_message(ls, ms); | |
3840 | } | |
3841 | ||
3842 | /* This is called by the midcomms layer when something is received for | |
3843 | the lockspace. It could be either a MSG (normal message sent as part of | |
3844 | standard locking activity) or an RCOM (recovery message sent as part of | |
3845 | lockspace recovery). */ | |
3846 | ||
eef7d739 | 3847 | void dlm_receive_buffer(union dlm_packet *p, int nodeid) |
c36258b5 | 3848 | { |
eef7d739 | 3849 | struct dlm_header *hd = &p->header; |
c36258b5 DT |
3850 | struct dlm_ls *ls; |
3851 | int type = 0; | |
3852 | ||
3853 | switch (hd->h_cmd) { | |
3854 | case DLM_MSG: | |
eef7d739 AV |
3855 | dlm_message_in(&p->message); |
3856 | type = p->message.m_type; | |
c36258b5 DT |
3857 | break; |
3858 | case DLM_RCOM: | |
eef7d739 AV |
3859 | dlm_rcom_in(&p->rcom); |
3860 | type = p->rcom.rc_type; | |
c36258b5 DT |
3861 | break; |
3862 | default: | |
3863 | log_print("invalid h_cmd %d from %u", hd->h_cmd, nodeid); | |
3864 | return; | |
3865 | } | |
3866 | ||
3867 | if (hd->h_nodeid != nodeid) { | |
3868 | log_print("invalid h_nodeid %d from %d lockspace %x", | |
3869 | hd->h_nodeid, nodeid, hd->h_lockspace); | |
3870 | return; | |
3871 | } | |
3872 | ||
3873 | ls = dlm_find_lockspace_global(hd->h_lockspace); | |
3874 | if (!ls) { | |
594199eb DT |
3875 | if (dlm_config.ci_log_debug) |
3876 | log_print("invalid lockspace %x from %d cmd %d type %d", | |
3877 | hd->h_lockspace, nodeid, hd->h_cmd, type); | |
c36258b5 DT |
3878 | |
3879 | if (hd->h_cmd == DLM_RCOM && type == DLM_RCOM_STATUS) | |
eef7d739 | 3880 | dlm_send_ls_not_ready(nodeid, &p->rcom); |
c36258b5 DT |
3881 | return; |
3882 | } | |
3883 | ||
3884 | /* this rwsem allows dlm_ls_stop() to wait for all dlm_recv threads to | |
3885 | be inactive (in this ls) before transitioning to recovery mode */ | |
3886 | ||
3887 | down_read(&ls->ls_recv_active); | |
3888 | if (hd->h_cmd == DLM_MSG) | |
eef7d739 | 3889 | dlm_receive_message(ls, &p->message, nodeid); |
c36258b5 | 3890 | else |
eef7d739 | 3891 | dlm_receive_rcom(ls, &p->rcom, nodeid); |
c36258b5 DT |
3892 | up_read(&ls->ls_recv_active); |
3893 | ||
3894 | dlm_put_lockspace(ls); | |
3895 | } | |
e7fd4179 DT |
3896 | |
3897 | static void recover_convert_waiter(struct dlm_ls *ls, struct dlm_lkb *lkb) | |
3898 | { | |
3899 | if (middle_conversion(lkb)) { | |
3900 | hold_lkb(lkb); | |
ef0c2bb0 | 3901 | ls->ls_stub_ms.m_type = DLM_MSG_CONVERT_REPLY; |
e7fd4179 | 3902 | ls->ls_stub_ms.m_result = -EINPROGRESS; |
075529b5 | 3903 | ls->ls_stub_ms.m_flags = lkb->lkb_flags; |
c54e04b0 | 3904 | ls->ls_stub_ms.m_header.h_nodeid = lkb->lkb_nodeid; |
e7fd4179 DT |
3905 | _receive_convert_reply(lkb, &ls->ls_stub_ms); |
3906 | ||
3907 | /* Same special case as in receive_rcom_lock_args() */ | |
3908 | lkb->lkb_grmode = DLM_LOCK_IV; | |
3909 | rsb_set_flag(lkb->lkb_resource, RSB_RECOVER_CONVERT); | |
3910 | unhold_lkb(lkb); | |
3911 | ||
3912 | } else if (lkb->lkb_rqmode >= lkb->lkb_grmode) { | |
3913 | lkb->lkb_flags |= DLM_IFL_RESEND; | |
3914 | } | |
3915 | ||
3916 | /* lkb->lkb_rqmode < lkb->lkb_grmode shouldn't happen since down | |
3917 | conversions are async; there's no reply from the remote master */ | |
3918 | } | |
3919 | ||
3920 | /* A waiting lkb needs recovery if the master node has failed, or | |
3921 | the master node is changing (only when no directory is used) */ | |
3922 | ||
3923 | static int waiter_needs_recovery(struct dlm_ls *ls, struct dlm_lkb *lkb) | |
3924 | { | |
3925 | if (dlm_is_removed(ls, lkb->lkb_nodeid)) | |
3926 | return 1; | |
3927 | ||
3928 | if (!dlm_no_directory(ls)) | |
3929 | return 0; | |
3930 | ||
3931 | if (dlm_dir_nodeid(lkb->lkb_resource) != lkb->lkb_nodeid) | |
3932 | return 1; | |
3933 | ||
3934 | return 0; | |
3935 | } | |
3936 | ||
3937 | /* Recovery for locks that are waiting for replies from nodes that are now | |
3938 | gone. We can just complete unlocks and cancels by faking a reply from the | |
3939 | dead node. Requests and up-conversions we flag to be resent after | |
3940 | recovery. Down-conversions can just be completed with a fake reply like | |
3941 | unlocks. Conversions between PR and CW need special attention. */ | |
3942 | ||
3943 | void dlm_recover_waiters_pre(struct dlm_ls *ls) | |
3944 | { | |
3945 | struct dlm_lkb *lkb, *safe; | |
601342ce | 3946 | int wait_type, stub_unlock_result, stub_cancel_result; |
e7fd4179 | 3947 | |
90135925 | 3948 | mutex_lock(&ls->ls_waiters_mutex); |
e7fd4179 DT |
3949 | |
3950 | list_for_each_entry_safe(lkb, safe, &ls->ls_waiters, lkb_wait_reply) { | |
3951 | log_debug(ls, "pre recover waiter lkid %x type %d flags %x", | |
3952 | lkb->lkb_id, lkb->lkb_wait_type, lkb->lkb_flags); | |
3953 | ||
3954 | /* all outstanding lookups, regardless of destination will be | |
3955 | resent after recovery is done */ | |
3956 | ||
3957 | if (lkb->lkb_wait_type == DLM_MSG_LOOKUP) { | |
3958 | lkb->lkb_flags |= DLM_IFL_RESEND; | |
3959 | continue; | |
3960 | } | |
3961 | ||
3962 | if (!waiter_needs_recovery(ls, lkb)) | |
3963 | continue; | |
3964 | ||
601342ce DT |
3965 | wait_type = lkb->lkb_wait_type; |
3966 | stub_unlock_result = -DLM_EUNLOCK; | |
3967 | stub_cancel_result = -DLM_ECANCEL; | |
3968 | ||
3969 | /* Main reply may have been received leaving a zero wait_type, | |
3970 | but a reply for the overlapping op may not have been | |
3971 | received. In that case we need to fake the appropriate | |
3972 | reply for the overlap op. */ | |
3973 | ||
3974 | if (!wait_type) { | |
3975 | if (is_overlap_cancel(lkb)) { | |
3976 | wait_type = DLM_MSG_CANCEL; | |
3977 | if (lkb->lkb_grmode == DLM_LOCK_IV) | |
3978 | stub_cancel_result = 0; | |
3979 | } | |
3980 | if (is_overlap_unlock(lkb)) { | |
3981 | wait_type = DLM_MSG_UNLOCK; | |
3982 | if (lkb->lkb_grmode == DLM_LOCK_IV) | |
3983 | stub_unlock_result = -ENOENT; | |
3984 | } | |
3985 | ||
3986 | log_debug(ls, "rwpre overlap %x %x %d %d %d", | |
3987 | lkb->lkb_id, lkb->lkb_flags, wait_type, | |
3988 | stub_cancel_result, stub_unlock_result); | |
3989 | } | |
3990 | ||
3991 | switch (wait_type) { | |
e7fd4179 DT |
3992 | |
3993 | case DLM_MSG_REQUEST: | |
3994 | lkb->lkb_flags |= DLM_IFL_RESEND; | |
3995 | break; | |
3996 | ||
3997 | case DLM_MSG_CONVERT: | |
3998 | recover_convert_waiter(ls, lkb); | |
3999 | break; | |
4000 | ||
4001 | case DLM_MSG_UNLOCK: | |
4002 | hold_lkb(lkb); | |
ef0c2bb0 | 4003 | ls->ls_stub_ms.m_type = DLM_MSG_UNLOCK_REPLY; |
601342ce | 4004 | ls->ls_stub_ms.m_result = stub_unlock_result; |
075529b5 | 4005 | ls->ls_stub_ms.m_flags = lkb->lkb_flags; |
c54e04b0 | 4006 | ls->ls_stub_ms.m_header.h_nodeid = lkb->lkb_nodeid; |
e7fd4179 | 4007 | _receive_unlock_reply(lkb, &ls->ls_stub_ms); |
b3f58d8f | 4008 | dlm_put_lkb(lkb); |
e7fd4179 DT |
4009 | break; |
4010 | ||
4011 | case DLM_MSG_CANCEL: | |
4012 | hold_lkb(lkb); | |
ef0c2bb0 | 4013 | ls->ls_stub_ms.m_type = DLM_MSG_CANCEL_REPLY; |
601342ce | 4014 | ls->ls_stub_ms.m_result = stub_cancel_result; |
075529b5 | 4015 | ls->ls_stub_ms.m_flags = lkb->lkb_flags; |
c54e04b0 | 4016 | ls->ls_stub_ms.m_header.h_nodeid = lkb->lkb_nodeid; |
e7fd4179 | 4017 | _receive_cancel_reply(lkb, &ls->ls_stub_ms); |
b3f58d8f | 4018 | dlm_put_lkb(lkb); |
e7fd4179 DT |
4019 | break; |
4020 | ||
4021 | default: | |
601342ce DT |
4022 | log_error(ls, "invalid lkb wait_type %d %d", |
4023 | lkb->lkb_wait_type, wait_type); | |
e7fd4179 | 4024 | } |
81456807 | 4025 | schedule(); |
e7fd4179 | 4026 | } |
90135925 | 4027 | mutex_unlock(&ls->ls_waiters_mutex); |
e7fd4179 DT |
4028 | } |
4029 | ||
ef0c2bb0 | 4030 | static struct dlm_lkb *find_resend_waiter(struct dlm_ls *ls) |
e7fd4179 DT |
4031 | { |
4032 | struct dlm_lkb *lkb; | |
ef0c2bb0 | 4033 | int found = 0; |
e7fd4179 | 4034 | |
90135925 | 4035 | mutex_lock(&ls->ls_waiters_mutex); |
e7fd4179 DT |
4036 | list_for_each_entry(lkb, &ls->ls_waiters, lkb_wait_reply) { |
4037 | if (lkb->lkb_flags & DLM_IFL_RESEND) { | |
ef0c2bb0 DT |
4038 | hold_lkb(lkb); |
4039 | found = 1; | |
e7fd4179 DT |
4040 | break; |
4041 | } | |
4042 | } | |
90135925 | 4043 | mutex_unlock(&ls->ls_waiters_mutex); |
e7fd4179 | 4044 | |
ef0c2bb0 | 4045 | if (!found) |
e7fd4179 | 4046 | lkb = NULL; |
ef0c2bb0 | 4047 | return lkb; |
e7fd4179 DT |
4048 | } |
4049 | ||
4050 | /* Deal with lookups and lkb's marked RESEND from _pre. We may now be the | |
4051 | master or dir-node for r. Processing the lkb may result in it being placed | |
4052 | back on waiters. */ | |
4053 | ||
ef0c2bb0 DT |
4054 | /* We do this after normal locking has been enabled and any saved messages |
4055 | (in requestqueue) have been processed. We should be confident that at | |
4056 | this point we won't get or process a reply to any of these waiting | |
4057 | operations. But, new ops may be coming in on the rsbs/locks here from | |
4058 | userspace or remotely. */ | |
4059 | ||
4060 | /* there may have been an overlap unlock/cancel prior to recovery or after | |
4061 | recovery. if before, the lkb may still have a pos wait_count; if after, the | |
4062 | overlap flag would just have been set and nothing new sent. we can be | |
4063 | confident here than any replies to either the initial op or overlap ops | |
4064 | prior to recovery have been received. */ | |
4065 | ||
e7fd4179 DT |
4066 | int dlm_recover_waiters_post(struct dlm_ls *ls) |
4067 | { | |
4068 | struct dlm_lkb *lkb; | |
4069 | struct dlm_rsb *r; | |
ef0c2bb0 | 4070 | int error = 0, mstype, err, oc, ou; |
e7fd4179 DT |
4071 | |
4072 | while (1) { | |
4073 | if (dlm_locking_stopped(ls)) { | |
4074 | log_debug(ls, "recover_waiters_post aborted"); | |
4075 | error = -EINTR; | |
4076 | break; | |
4077 | } | |
4078 | ||
ef0c2bb0 DT |
4079 | lkb = find_resend_waiter(ls); |
4080 | if (!lkb) | |
e7fd4179 DT |
4081 | break; |
4082 | ||
4083 | r = lkb->lkb_resource; | |
ef0c2bb0 DT |
4084 | hold_rsb(r); |
4085 | lock_rsb(r); | |
4086 | ||
4087 | mstype = lkb->lkb_wait_type; | |
4088 | oc = is_overlap_cancel(lkb); | |
4089 | ou = is_overlap_unlock(lkb); | |
4090 | err = 0; | |
e7fd4179 DT |
4091 | |
4092 | log_debug(ls, "recover_waiters_post %x type %d flags %x %s", | |
4093 | lkb->lkb_id, mstype, lkb->lkb_flags, r->res_name); | |
4094 | ||
ef0c2bb0 DT |
4095 | /* At this point we assume that we won't get a reply to any |
4096 | previous op or overlap op on this lock. First, do a big | |
4097 | remove_from_waiters() for all previous ops. */ | |
4098 | ||
4099 | lkb->lkb_flags &= ~DLM_IFL_RESEND; | |
4100 | lkb->lkb_flags &= ~DLM_IFL_OVERLAP_UNLOCK; | |
4101 | lkb->lkb_flags &= ~DLM_IFL_OVERLAP_CANCEL; | |
4102 | lkb->lkb_wait_type = 0; | |
4103 | lkb->lkb_wait_count = 0; | |
4104 | mutex_lock(&ls->ls_waiters_mutex); | |
4105 | list_del_init(&lkb->lkb_wait_reply); | |
4106 | mutex_unlock(&ls->ls_waiters_mutex); | |
4107 | unhold_lkb(lkb); /* for waiters list */ | |
4108 | ||
4109 | if (oc || ou) { | |
4110 | /* do an unlock or cancel instead of resending */ | |
4111 | switch (mstype) { | |
4112 | case DLM_MSG_LOOKUP: | |
4113 | case DLM_MSG_REQUEST: | |
4114 | queue_cast(r, lkb, ou ? -DLM_EUNLOCK : | |
4115 | -DLM_ECANCEL); | |
4116 | unhold_lkb(lkb); /* undoes create_lkb() */ | |
4117 | break; | |
4118 | case DLM_MSG_CONVERT: | |
4119 | if (oc) { | |
4120 | queue_cast(r, lkb, -DLM_ECANCEL); | |
4121 | } else { | |
4122 | lkb->lkb_exflags |= DLM_LKF_FORCEUNLOCK; | |
4123 | _unlock_lock(r, lkb); | |
4124 | } | |
4125 | break; | |
4126 | default: | |
4127 | err = 1; | |
4128 | } | |
4129 | } else { | |
4130 | switch (mstype) { | |
4131 | case DLM_MSG_LOOKUP: | |
4132 | case DLM_MSG_REQUEST: | |
4133 | _request_lock(r, lkb); | |
4134 | if (is_master(r)) | |
4135 | confirm_master(r, 0); | |
4136 | break; | |
4137 | case DLM_MSG_CONVERT: | |
4138 | _convert_lock(r, lkb); | |
4139 | break; | |
4140 | default: | |
4141 | err = 1; | |
4142 | } | |
e7fd4179 | 4143 | } |
ef0c2bb0 DT |
4144 | |
4145 | if (err) | |
4146 | log_error(ls, "recover_waiters_post %x %d %x %d %d", | |
4147 | lkb->lkb_id, mstype, lkb->lkb_flags, oc, ou); | |
4148 | unlock_rsb(r); | |
4149 | put_rsb(r); | |
4150 | dlm_put_lkb(lkb); | |
e7fd4179 DT |
4151 | } |
4152 | ||
4153 | return error; | |
4154 | } | |
4155 | ||
4156 | static void purge_queue(struct dlm_rsb *r, struct list_head *queue, | |
4157 | int (*test)(struct dlm_ls *ls, struct dlm_lkb *lkb)) | |
4158 | { | |
4159 | struct dlm_ls *ls = r->res_ls; | |
4160 | struct dlm_lkb *lkb, *safe; | |
4161 | ||
4162 | list_for_each_entry_safe(lkb, safe, queue, lkb_statequeue) { | |
4163 | if (test(ls, lkb)) { | |
97a35d1e | 4164 | rsb_set_flag(r, RSB_LOCKS_PURGED); |
e7fd4179 DT |
4165 | del_lkb(r, lkb); |
4166 | /* this put should free the lkb */ | |
b3f58d8f | 4167 | if (!dlm_put_lkb(lkb)) |
e7fd4179 DT |
4168 | log_error(ls, "purged lkb not released"); |
4169 | } | |
4170 | } | |
4171 | } | |
4172 | ||
4173 | static int purge_dead_test(struct dlm_ls *ls, struct dlm_lkb *lkb) | |
4174 | { | |
4175 | return (is_master_copy(lkb) && dlm_is_removed(ls, lkb->lkb_nodeid)); | |
4176 | } | |
4177 | ||
4178 | static int purge_mstcpy_test(struct dlm_ls *ls, struct dlm_lkb *lkb) | |
4179 | { | |
4180 | return is_master_copy(lkb); | |
4181 | } | |
4182 | ||
4183 | static void purge_dead_locks(struct dlm_rsb *r) | |
4184 | { | |
4185 | purge_queue(r, &r->res_grantqueue, &purge_dead_test); | |
4186 | purge_queue(r, &r->res_convertqueue, &purge_dead_test); | |
4187 | purge_queue(r, &r->res_waitqueue, &purge_dead_test); | |
4188 | } | |
4189 | ||
4190 | void dlm_purge_mstcpy_locks(struct dlm_rsb *r) | |
4191 | { | |
4192 | purge_queue(r, &r->res_grantqueue, &purge_mstcpy_test); | |
4193 | purge_queue(r, &r->res_convertqueue, &purge_mstcpy_test); | |
4194 | purge_queue(r, &r->res_waitqueue, &purge_mstcpy_test); | |
4195 | } | |
4196 | ||
4197 | /* Get rid of locks held by nodes that are gone. */ | |
4198 | ||
4199 | int dlm_purge_locks(struct dlm_ls *ls) | |
4200 | { | |
4201 | struct dlm_rsb *r; | |
4202 | ||
4203 | log_debug(ls, "dlm_purge_locks"); | |
4204 | ||
4205 | down_write(&ls->ls_root_sem); | |
4206 | list_for_each_entry(r, &ls->ls_root_list, res_root_list) { | |
4207 | hold_rsb(r); | |
4208 | lock_rsb(r); | |
4209 | if (is_master(r)) | |
4210 | purge_dead_locks(r); | |
4211 | unlock_rsb(r); | |
4212 | unhold_rsb(r); | |
4213 | ||
4214 | schedule(); | |
4215 | } | |
4216 | up_write(&ls->ls_root_sem); | |
4217 | ||
4218 | return 0; | |
4219 | } | |
4220 | ||
97a35d1e DT |
4221 | static struct dlm_rsb *find_purged_rsb(struct dlm_ls *ls, int bucket) |
4222 | { | |
4223 | struct dlm_rsb *r, *r_ret = NULL; | |
4224 | ||
4225 | read_lock(&ls->ls_rsbtbl[bucket].lock); | |
4226 | list_for_each_entry(r, &ls->ls_rsbtbl[bucket].list, res_hashchain) { | |
4227 | if (!rsb_flag(r, RSB_LOCKS_PURGED)) | |
4228 | continue; | |
4229 | hold_rsb(r); | |
4230 | rsb_clear_flag(r, RSB_LOCKS_PURGED); | |
4231 | r_ret = r; | |
4232 | break; | |
4233 | } | |
4234 | read_unlock(&ls->ls_rsbtbl[bucket].lock); | |
4235 | return r_ret; | |
4236 | } | |
4237 | ||
4238 | void dlm_grant_after_purge(struct dlm_ls *ls) | |
e7fd4179 DT |
4239 | { |
4240 | struct dlm_rsb *r; | |
2b4e926a | 4241 | int bucket = 0; |
e7fd4179 | 4242 | |
2b4e926a DT |
4243 | while (1) { |
4244 | r = find_purged_rsb(ls, bucket); | |
4245 | if (!r) { | |
4246 | if (bucket == ls->ls_rsbtbl_size - 1) | |
4247 | break; | |
4248 | bucket++; | |
97a35d1e | 4249 | continue; |
2b4e926a | 4250 | } |
97a35d1e DT |
4251 | lock_rsb(r); |
4252 | if (is_master(r)) { | |
4253 | grant_pending_locks(r); | |
4254 | confirm_master(r, 0); | |
e7fd4179 | 4255 | } |
97a35d1e DT |
4256 | unlock_rsb(r); |
4257 | put_rsb(r); | |
2b4e926a | 4258 | schedule(); |
e7fd4179 | 4259 | } |
e7fd4179 DT |
4260 | } |
4261 | ||
4262 | static struct dlm_lkb *search_remid_list(struct list_head *head, int nodeid, | |
4263 | uint32_t remid) | |
4264 | { | |
4265 | struct dlm_lkb *lkb; | |
4266 | ||
4267 | list_for_each_entry(lkb, head, lkb_statequeue) { | |
4268 | if (lkb->lkb_nodeid == nodeid && lkb->lkb_remid == remid) | |
4269 | return lkb; | |
4270 | } | |
4271 | return NULL; | |
4272 | } | |
4273 | ||
4274 | static struct dlm_lkb *search_remid(struct dlm_rsb *r, int nodeid, | |
4275 | uint32_t remid) | |
4276 | { | |
4277 | struct dlm_lkb *lkb; | |
4278 | ||
4279 | lkb = search_remid_list(&r->res_grantqueue, nodeid, remid); | |
4280 | if (lkb) | |
4281 | return lkb; | |
4282 | lkb = search_remid_list(&r->res_convertqueue, nodeid, remid); | |
4283 | if (lkb) | |
4284 | return lkb; | |
4285 | lkb = search_remid_list(&r->res_waitqueue, nodeid, remid); | |
4286 | if (lkb) | |
4287 | return lkb; | |
4288 | return NULL; | |
4289 | } | |
4290 | ||
ae773d0b | 4291 | /* needs at least dlm_rcom + rcom_lock */ |
e7fd4179 DT |
4292 | static int receive_rcom_lock_args(struct dlm_ls *ls, struct dlm_lkb *lkb, |
4293 | struct dlm_rsb *r, struct dlm_rcom *rc) | |
4294 | { | |
4295 | struct rcom_lock *rl = (struct rcom_lock *) rc->rc_buf; | |
e7fd4179 DT |
4296 | |
4297 | lkb->lkb_nodeid = rc->rc_header.h_nodeid; | |
163a1859 AV |
4298 | lkb->lkb_ownpid = le32_to_cpu(rl->rl_ownpid); |
4299 | lkb->lkb_remid = le32_to_cpu(rl->rl_lkid); | |
4300 | lkb->lkb_exflags = le32_to_cpu(rl->rl_exflags); | |
4301 | lkb->lkb_flags = le32_to_cpu(rl->rl_flags) & 0x0000FFFF; | |
e7fd4179 | 4302 | lkb->lkb_flags |= DLM_IFL_MSTCPY; |
163a1859 | 4303 | lkb->lkb_lvbseq = le32_to_cpu(rl->rl_lvbseq); |
e7fd4179 DT |
4304 | lkb->lkb_rqmode = rl->rl_rqmode; |
4305 | lkb->lkb_grmode = rl->rl_grmode; | |
4306 | /* don't set lkb_status because add_lkb wants to itself */ | |
4307 | ||
e5dae548 DT |
4308 | lkb->lkb_bastfn = (rl->rl_asts & AST_BAST) ? &fake_bastfn : NULL; |
4309 | lkb->lkb_astfn = (rl->rl_asts & AST_COMP) ? &fake_astfn : NULL; | |
e7fd4179 | 4310 | |
e7fd4179 | 4311 | if (lkb->lkb_exflags & DLM_LKF_VALBLK) { |
a5dd0631 AV |
4312 | int lvblen = rc->rc_header.h_length - sizeof(struct dlm_rcom) - |
4313 | sizeof(struct rcom_lock); | |
4314 | if (lvblen > ls->ls_lvblen) | |
4315 | return -EINVAL; | |
52bda2b5 | 4316 | lkb->lkb_lvbptr = dlm_allocate_lvb(ls); |
e7fd4179 DT |
4317 | if (!lkb->lkb_lvbptr) |
4318 | return -ENOMEM; | |
e7fd4179 DT |
4319 | memcpy(lkb->lkb_lvbptr, rl->rl_lvb, lvblen); |
4320 | } | |
4321 | ||
4322 | /* Conversions between PR and CW (middle modes) need special handling. | |
4323 | The real granted mode of these converting locks cannot be determined | |
4324 | until all locks have been rebuilt on the rsb (recover_conversion) */ | |
4325 | ||
163a1859 AV |
4326 | if (rl->rl_wait_type == cpu_to_le16(DLM_MSG_CONVERT) && |
4327 | middle_conversion(lkb)) { | |
e7fd4179 DT |
4328 | rl->rl_status = DLM_LKSTS_CONVERT; |
4329 | lkb->lkb_grmode = DLM_LOCK_IV; | |
4330 | rsb_set_flag(r, RSB_RECOVER_CONVERT); | |
4331 | } | |
4332 | ||
4333 | return 0; | |
4334 | } | |
4335 | ||
4336 | /* This lkb may have been recovered in a previous aborted recovery so we need | |
4337 | to check if the rsb already has an lkb with the given remote nodeid/lkid. | |
4338 | If so we just send back a standard reply. If not, we create a new lkb with | |
4339 | the given values and send back our lkid. We send back our lkid by sending | |
4340 | back the rcom_lock struct we got but with the remid field filled in. */ | |
4341 | ||
ae773d0b | 4342 | /* needs at least dlm_rcom + rcom_lock */ |
e7fd4179 DT |
4343 | int dlm_recover_master_copy(struct dlm_ls *ls, struct dlm_rcom *rc) |
4344 | { | |
4345 | struct rcom_lock *rl = (struct rcom_lock *) rc->rc_buf; | |
4346 | struct dlm_rsb *r; | |
4347 | struct dlm_lkb *lkb; | |
4348 | int error; | |
4349 | ||
4350 | if (rl->rl_parent_lkid) { | |
4351 | error = -EOPNOTSUPP; | |
4352 | goto out; | |
4353 | } | |
4354 | ||
163a1859 AV |
4355 | error = find_rsb(ls, rl->rl_name, le16_to_cpu(rl->rl_namelen), |
4356 | R_MASTER, &r); | |
e7fd4179 DT |
4357 | if (error) |
4358 | goto out; | |
4359 | ||
4360 | lock_rsb(r); | |
4361 | ||
163a1859 | 4362 | lkb = search_remid(r, rc->rc_header.h_nodeid, le32_to_cpu(rl->rl_lkid)); |
e7fd4179 DT |
4363 | if (lkb) { |
4364 | error = -EEXIST; | |
4365 | goto out_remid; | |
4366 | } | |
4367 | ||
4368 | error = create_lkb(ls, &lkb); | |
4369 | if (error) | |
4370 | goto out_unlock; | |
4371 | ||
4372 | error = receive_rcom_lock_args(ls, lkb, r, rc); | |
4373 | if (error) { | |
b3f58d8f | 4374 | __put_lkb(ls, lkb); |
e7fd4179 DT |
4375 | goto out_unlock; |
4376 | } | |
4377 | ||
4378 | attach_lkb(r, lkb); | |
4379 | add_lkb(r, lkb, rl->rl_status); | |
4380 | error = 0; | |
4381 | ||
4382 | out_remid: | |
4383 | /* this is the new value returned to the lock holder for | |
4384 | saving in its process-copy lkb */ | |
163a1859 | 4385 | rl->rl_remid = cpu_to_le32(lkb->lkb_id); |
e7fd4179 DT |
4386 | |
4387 | out_unlock: | |
4388 | unlock_rsb(r); | |
4389 | put_rsb(r); | |
4390 | out: | |
4391 | if (error) | |
163a1859 AV |
4392 | log_debug(ls, "recover_master_copy %d %x", error, |
4393 | le32_to_cpu(rl->rl_lkid)); | |
4394 | rl->rl_result = cpu_to_le32(error); | |
e7fd4179 DT |
4395 | return error; |
4396 | } | |
4397 | ||
ae773d0b | 4398 | /* needs at least dlm_rcom + rcom_lock */ |
e7fd4179 DT |
4399 | int dlm_recover_process_copy(struct dlm_ls *ls, struct dlm_rcom *rc) |
4400 | { | |
4401 | struct rcom_lock *rl = (struct rcom_lock *) rc->rc_buf; | |
4402 | struct dlm_rsb *r; | |
4403 | struct dlm_lkb *lkb; | |
4404 | int error; | |
4405 | ||
163a1859 | 4406 | error = find_lkb(ls, le32_to_cpu(rl->rl_lkid), &lkb); |
e7fd4179 | 4407 | if (error) { |
163a1859 AV |
4408 | log_error(ls, "recover_process_copy no lkid %x", |
4409 | le32_to_cpu(rl->rl_lkid)); | |
e7fd4179 DT |
4410 | return error; |
4411 | } | |
4412 | ||
4413 | DLM_ASSERT(is_process_copy(lkb), dlm_print_lkb(lkb);); | |
4414 | ||
163a1859 | 4415 | error = le32_to_cpu(rl->rl_result); |
e7fd4179 DT |
4416 | |
4417 | r = lkb->lkb_resource; | |
4418 | hold_rsb(r); | |
4419 | lock_rsb(r); | |
4420 | ||
4421 | switch (error) { | |
dc200a88 DT |
4422 | case -EBADR: |
4423 | /* There's a chance the new master received our lock before | |
4424 | dlm_recover_master_reply(), this wouldn't happen if we did | |
4425 | a barrier between recover_masters and recover_locks. */ | |
4426 | log_debug(ls, "master copy not ready %x r %lx %s", lkb->lkb_id, | |
4427 | (unsigned long)r, r->res_name); | |
4428 | dlm_send_rcom_lock(r, lkb); | |
4429 | goto out; | |
e7fd4179 DT |
4430 | case -EEXIST: |
4431 | log_debug(ls, "master copy exists %x", lkb->lkb_id); | |
4432 | /* fall through */ | |
4433 | case 0: | |
163a1859 | 4434 | lkb->lkb_remid = le32_to_cpu(rl->rl_remid); |
e7fd4179 DT |
4435 | break; |
4436 | default: | |
4437 | log_error(ls, "dlm_recover_process_copy unknown error %d %x", | |
4438 | error, lkb->lkb_id); | |
4439 | } | |
4440 | ||
4441 | /* an ack for dlm_recover_locks() which waits for replies from | |
4442 | all the locks it sends to new masters */ | |
4443 | dlm_recovered_lock(r); | |
dc200a88 | 4444 | out: |
e7fd4179 DT |
4445 | unlock_rsb(r); |
4446 | put_rsb(r); | |
b3f58d8f | 4447 | dlm_put_lkb(lkb); |
e7fd4179 DT |
4448 | |
4449 | return 0; | |
4450 | } | |
4451 | ||
597d0cae DT |
4452 | int dlm_user_request(struct dlm_ls *ls, struct dlm_user_args *ua, |
4453 | int mode, uint32_t flags, void *name, unsigned int namelen, | |
d7db923e | 4454 | unsigned long timeout_cs) |
597d0cae DT |
4455 | { |
4456 | struct dlm_lkb *lkb; | |
4457 | struct dlm_args args; | |
4458 | int error; | |
4459 | ||
85e86edf | 4460 | dlm_lock_recovery(ls); |
597d0cae DT |
4461 | |
4462 | error = create_lkb(ls, &lkb); | |
4463 | if (error) { | |
4464 | kfree(ua); | |
4465 | goto out; | |
4466 | } | |
4467 | ||
4468 | if (flags & DLM_LKF_VALBLK) { | |
62a0f623 | 4469 | ua->lksb.sb_lvbptr = kzalloc(DLM_USER_LVB_LEN, GFP_KERNEL); |
597d0cae DT |
4470 | if (!ua->lksb.sb_lvbptr) { |
4471 | kfree(ua); | |
4472 | __put_lkb(ls, lkb); | |
4473 | error = -ENOMEM; | |
4474 | goto out; | |
4475 | } | |
4476 | } | |
4477 | ||
52bda2b5 | 4478 | /* After ua is attached to lkb it will be freed by dlm_free_lkb(). |
597d0cae DT |
4479 | When DLM_IFL_USER is set, the dlm knows that this is a userspace |
4480 | lock and that lkb_astparam is the dlm_user_args structure. */ | |
4481 | ||
d7db923e | 4482 | error = set_lock_args(mode, &ua->lksb, flags, namelen, timeout_cs, |
e5dae548 | 4483 | fake_astfn, ua, fake_bastfn, &args); |
597d0cae DT |
4484 | lkb->lkb_flags |= DLM_IFL_USER; |
4485 | ua->old_mode = DLM_LOCK_IV; | |
4486 | ||
4487 | if (error) { | |
4488 | __put_lkb(ls, lkb); | |
4489 | goto out; | |
4490 | } | |
4491 | ||
4492 | error = request_lock(ls, lkb, name, namelen, &args); | |
4493 | ||
4494 | switch (error) { | |
4495 | case 0: | |
4496 | break; | |
4497 | case -EINPROGRESS: | |
4498 | error = 0; | |
4499 | break; | |
4500 | case -EAGAIN: | |
4501 | error = 0; | |
4502 | /* fall through */ | |
4503 | default: | |
4504 | __put_lkb(ls, lkb); | |
4505 | goto out; | |
4506 | } | |
4507 | ||
4508 | /* add this new lkb to the per-process list of locks */ | |
4509 | spin_lock(&ua->proc->locks_spin); | |
ef0c2bb0 | 4510 | hold_lkb(lkb); |
597d0cae DT |
4511 | list_add_tail(&lkb->lkb_ownqueue, &ua->proc->locks); |
4512 | spin_unlock(&ua->proc->locks_spin); | |
4513 | out: | |
85e86edf | 4514 | dlm_unlock_recovery(ls); |
597d0cae DT |
4515 | return error; |
4516 | } | |
4517 | ||
4518 | int dlm_user_convert(struct dlm_ls *ls, struct dlm_user_args *ua_tmp, | |
d7db923e DT |
4519 | int mode, uint32_t flags, uint32_t lkid, char *lvb_in, |
4520 | unsigned long timeout_cs) | |
597d0cae DT |
4521 | { |
4522 | struct dlm_lkb *lkb; | |
4523 | struct dlm_args args; | |
4524 | struct dlm_user_args *ua; | |
4525 | int error; | |
4526 | ||
85e86edf | 4527 | dlm_lock_recovery(ls); |
597d0cae DT |
4528 | |
4529 | error = find_lkb(ls, lkid, &lkb); | |
4530 | if (error) | |
4531 | goto out; | |
4532 | ||
4533 | /* user can change the params on its lock when it converts it, or | |
4534 | add an lvb that didn't exist before */ | |
4535 | ||
d292c0cc | 4536 | ua = lkb->lkb_ua; |
597d0cae DT |
4537 | |
4538 | if (flags & DLM_LKF_VALBLK && !ua->lksb.sb_lvbptr) { | |
62a0f623 | 4539 | ua->lksb.sb_lvbptr = kzalloc(DLM_USER_LVB_LEN, GFP_KERNEL); |
597d0cae DT |
4540 | if (!ua->lksb.sb_lvbptr) { |
4541 | error = -ENOMEM; | |
4542 | goto out_put; | |
4543 | } | |
4544 | } | |
4545 | if (lvb_in && ua->lksb.sb_lvbptr) | |
4546 | memcpy(ua->lksb.sb_lvbptr, lvb_in, DLM_USER_LVB_LEN); | |
4547 | ||
d7db923e | 4548 | ua->xid = ua_tmp->xid; |
597d0cae DT |
4549 | ua->castparam = ua_tmp->castparam; |
4550 | ua->castaddr = ua_tmp->castaddr; | |
4551 | ua->bastparam = ua_tmp->bastparam; | |
4552 | ua->bastaddr = ua_tmp->bastaddr; | |
10948eb4 | 4553 | ua->user_lksb = ua_tmp->user_lksb; |
597d0cae DT |
4554 | ua->old_mode = lkb->lkb_grmode; |
4555 | ||
d7db923e | 4556 | error = set_lock_args(mode, &ua->lksb, flags, 0, timeout_cs, |
e5dae548 | 4557 | fake_astfn, ua, fake_bastfn, &args); |
597d0cae DT |
4558 | if (error) |
4559 | goto out_put; | |
4560 | ||
4561 | error = convert_lock(ls, lkb, &args); | |
4562 | ||
c85d65e9 | 4563 | if (error == -EINPROGRESS || error == -EAGAIN || error == -EDEADLK) |
597d0cae DT |
4564 | error = 0; |
4565 | out_put: | |
4566 | dlm_put_lkb(lkb); | |
4567 | out: | |
85e86edf | 4568 | dlm_unlock_recovery(ls); |
597d0cae DT |
4569 | kfree(ua_tmp); |
4570 | return error; | |
4571 | } | |
4572 | ||
4573 | int dlm_user_unlock(struct dlm_ls *ls, struct dlm_user_args *ua_tmp, | |
4574 | uint32_t flags, uint32_t lkid, char *lvb_in) | |
4575 | { | |
4576 | struct dlm_lkb *lkb; | |
4577 | struct dlm_args args; | |
4578 | struct dlm_user_args *ua; | |
4579 | int error; | |
4580 | ||
85e86edf | 4581 | dlm_lock_recovery(ls); |
597d0cae DT |
4582 | |
4583 | error = find_lkb(ls, lkid, &lkb); | |
4584 | if (error) | |
4585 | goto out; | |
4586 | ||
d292c0cc | 4587 | ua = lkb->lkb_ua; |
597d0cae DT |
4588 | |
4589 | if (lvb_in && ua->lksb.sb_lvbptr) | |
4590 | memcpy(ua->lksb.sb_lvbptr, lvb_in, DLM_USER_LVB_LEN); | |
b434eda6 PC |
4591 | if (ua_tmp->castparam) |
4592 | ua->castparam = ua_tmp->castparam; | |
cc346d55 | 4593 | ua->user_lksb = ua_tmp->user_lksb; |
597d0cae DT |
4594 | |
4595 | error = set_unlock_args(flags, ua, &args); | |
4596 | if (error) | |
4597 | goto out_put; | |
4598 | ||
4599 | error = unlock_lock(ls, lkb, &args); | |
4600 | ||
4601 | if (error == -DLM_EUNLOCK) | |
4602 | error = 0; | |
ef0c2bb0 DT |
4603 | /* from validate_unlock_args() */ |
4604 | if (error == -EBUSY && (flags & DLM_LKF_FORCEUNLOCK)) | |
4605 | error = 0; | |
597d0cae DT |
4606 | if (error) |
4607 | goto out_put; | |
4608 | ||
4609 | spin_lock(&ua->proc->locks_spin); | |
a1bc86e6 DT |
4610 | /* dlm_user_add_ast() may have already taken lkb off the proc list */ |
4611 | if (!list_empty(&lkb->lkb_ownqueue)) | |
4612 | list_move(&lkb->lkb_ownqueue, &ua->proc->unlocking); | |
597d0cae | 4613 | spin_unlock(&ua->proc->locks_spin); |
597d0cae DT |
4614 | out_put: |
4615 | dlm_put_lkb(lkb); | |
4616 | out: | |
85e86edf | 4617 | dlm_unlock_recovery(ls); |
ef0c2bb0 | 4618 | kfree(ua_tmp); |
597d0cae DT |
4619 | return error; |
4620 | } | |
4621 | ||
4622 | int dlm_user_cancel(struct dlm_ls *ls, struct dlm_user_args *ua_tmp, | |
4623 | uint32_t flags, uint32_t lkid) | |
4624 | { | |
4625 | struct dlm_lkb *lkb; | |
4626 | struct dlm_args args; | |
4627 | struct dlm_user_args *ua; | |
4628 | int error; | |
4629 | ||
85e86edf | 4630 | dlm_lock_recovery(ls); |
597d0cae DT |
4631 | |
4632 | error = find_lkb(ls, lkid, &lkb); | |
4633 | if (error) | |
4634 | goto out; | |
4635 | ||
d292c0cc | 4636 | ua = lkb->lkb_ua; |
b434eda6 PC |
4637 | if (ua_tmp->castparam) |
4638 | ua->castparam = ua_tmp->castparam; | |
c059f70e | 4639 | ua->user_lksb = ua_tmp->user_lksb; |
597d0cae DT |
4640 | |
4641 | error = set_unlock_args(flags, ua, &args); | |
4642 | if (error) | |
4643 | goto out_put; | |
4644 | ||
4645 | error = cancel_lock(ls, lkb, &args); | |
4646 | ||
4647 | if (error == -DLM_ECANCEL) | |
4648 | error = 0; | |
ef0c2bb0 DT |
4649 | /* from validate_unlock_args() */ |
4650 | if (error == -EBUSY) | |
4651 | error = 0; | |
597d0cae DT |
4652 | out_put: |
4653 | dlm_put_lkb(lkb); | |
4654 | out: | |
85e86edf | 4655 | dlm_unlock_recovery(ls); |
ef0c2bb0 | 4656 | kfree(ua_tmp); |
597d0cae DT |
4657 | return error; |
4658 | } | |
4659 | ||
8b4021fa DT |
4660 | int dlm_user_deadlock(struct dlm_ls *ls, uint32_t flags, uint32_t lkid) |
4661 | { | |
4662 | struct dlm_lkb *lkb; | |
4663 | struct dlm_args args; | |
4664 | struct dlm_user_args *ua; | |
4665 | struct dlm_rsb *r; | |
4666 | int error; | |
4667 | ||
4668 | dlm_lock_recovery(ls); | |
4669 | ||
4670 | error = find_lkb(ls, lkid, &lkb); | |
4671 | if (error) | |
4672 | goto out; | |
4673 | ||
d292c0cc | 4674 | ua = lkb->lkb_ua; |
8b4021fa DT |
4675 | |
4676 | error = set_unlock_args(flags, ua, &args); | |
4677 | if (error) | |
4678 | goto out_put; | |
4679 | ||
4680 | /* same as cancel_lock(), but set DEADLOCK_CANCEL after lock_rsb */ | |
4681 | ||
4682 | r = lkb->lkb_resource; | |
4683 | hold_rsb(r); | |
4684 | lock_rsb(r); | |
4685 | ||
4686 | error = validate_unlock_args(lkb, &args); | |
4687 | if (error) | |
4688 | goto out_r; | |
4689 | lkb->lkb_flags |= DLM_IFL_DEADLOCK_CANCEL; | |
4690 | ||
4691 | error = _cancel_lock(r, lkb); | |
4692 | out_r: | |
4693 | unlock_rsb(r); | |
4694 | put_rsb(r); | |
4695 | ||
4696 | if (error == -DLM_ECANCEL) | |
4697 | error = 0; | |
4698 | /* from validate_unlock_args() */ | |
4699 | if (error == -EBUSY) | |
4700 | error = 0; | |
4701 | out_put: | |
4702 | dlm_put_lkb(lkb); | |
4703 | out: | |
4704 | dlm_unlock_recovery(ls); | |
4705 | return error; | |
4706 | } | |
4707 | ||
ef0c2bb0 DT |
4708 | /* lkb's that are removed from the waiters list by revert are just left on the |
4709 | orphans list with the granted orphan locks, to be freed by purge */ | |
4710 | ||
597d0cae DT |
4711 | static int orphan_proc_lock(struct dlm_ls *ls, struct dlm_lkb *lkb) |
4712 | { | |
ef0c2bb0 DT |
4713 | struct dlm_args args; |
4714 | int error; | |
597d0cae | 4715 | |
ef0c2bb0 DT |
4716 | hold_lkb(lkb); |
4717 | mutex_lock(&ls->ls_orphans_mutex); | |
4718 | list_add_tail(&lkb->lkb_ownqueue, &ls->ls_orphans); | |
4719 | mutex_unlock(&ls->ls_orphans_mutex); | |
597d0cae | 4720 | |
d292c0cc | 4721 | set_unlock_args(0, lkb->lkb_ua, &args); |
ef0c2bb0 DT |
4722 | |
4723 | error = cancel_lock(ls, lkb, &args); | |
4724 | if (error == -DLM_ECANCEL) | |
4725 | error = 0; | |
4726 | return error; | |
597d0cae DT |
4727 | } |
4728 | ||
4729 | /* The force flag allows the unlock to go ahead even if the lkb isn't granted. | |
4730 | Regardless of what rsb queue the lock is on, it's removed and freed. */ | |
4731 | ||
4732 | static int unlock_proc_lock(struct dlm_ls *ls, struct dlm_lkb *lkb) | |
4733 | { | |
597d0cae DT |
4734 | struct dlm_args args; |
4735 | int error; | |
4736 | ||
d292c0cc | 4737 | set_unlock_args(DLM_LKF_FORCEUNLOCK, lkb->lkb_ua, &args); |
597d0cae DT |
4738 | |
4739 | error = unlock_lock(ls, lkb, &args); | |
4740 | if (error == -DLM_EUNLOCK) | |
4741 | error = 0; | |
4742 | return error; | |
4743 | } | |
4744 | ||
ef0c2bb0 DT |
4745 | /* We have to release clear_proc_locks mutex before calling unlock_proc_lock() |
4746 | (which does lock_rsb) due to deadlock with receiving a message that does | |
4747 | lock_rsb followed by dlm_user_add_ast() */ | |
4748 | ||
4749 | static struct dlm_lkb *del_proc_lock(struct dlm_ls *ls, | |
4750 | struct dlm_user_proc *proc) | |
4751 | { | |
4752 | struct dlm_lkb *lkb = NULL; | |
4753 | ||
4754 | mutex_lock(&ls->ls_clear_proc_locks); | |
4755 | if (list_empty(&proc->locks)) | |
4756 | goto out; | |
4757 | ||
4758 | lkb = list_entry(proc->locks.next, struct dlm_lkb, lkb_ownqueue); | |
4759 | list_del_init(&lkb->lkb_ownqueue); | |
4760 | ||
4761 | if (lkb->lkb_exflags & DLM_LKF_PERSISTENT) | |
4762 | lkb->lkb_flags |= DLM_IFL_ORPHAN; | |
4763 | else | |
4764 | lkb->lkb_flags |= DLM_IFL_DEAD; | |
4765 | out: | |
4766 | mutex_unlock(&ls->ls_clear_proc_locks); | |
4767 | return lkb; | |
4768 | } | |
4769 | ||
597d0cae DT |
4770 | /* The ls_clear_proc_locks mutex protects against dlm_user_add_asts() which |
4771 | 1) references lkb->ua which we free here and 2) adds lkbs to proc->asts, | |
4772 | which we clear here. */ | |
4773 | ||
4774 | /* proc CLOSING flag is set so no more device_reads should look at proc->asts | |
4775 | list, and no more device_writes should add lkb's to proc->locks list; so we | |
4776 | shouldn't need to take asts_spin or locks_spin here. this assumes that | |
4777 | device reads/writes/closes are serialized -- FIXME: we may need to serialize | |
4778 | them ourself. */ | |
4779 | ||
4780 | void dlm_clear_proc_locks(struct dlm_ls *ls, struct dlm_user_proc *proc) | |
4781 | { | |
4782 | struct dlm_lkb *lkb, *safe; | |
4783 | ||
85e86edf | 4784 | dlm_lock_recovery(ls); |
597d0cae | 4785 | |
ef0c2bb0 DT |
4786 | while (1) { |
4787 | lkb = del_proc_lock(ls, proc); | |
4788 | if (!lkb) | |
4789 | break; | |
84d8cd69 | 4790 | del_timeout(lkb); |
ef0c2bb0 | 4791 | if (lkb->lkb_exflags & DLM_LKF_PERSISTENT) |
597d0cae | 4792 | orphan_proc_lock(ls, lkb); |
ef0c2bb0 | 4793 | else |
597d0cae | 4794 | unlock_proc_lock(ls, lkb); |
597d0cae DT |
4795 | |
4796 | /* this removes the reference for the proc->locks list | |
4797 | added by dlm_user_request, it may result in the lkb | |
4798 | being freed */ | |
4799 | ||
4800 | dlm_put_lkb(lkb); | |
4801 | } | |
a1bc86e6 | 4802 | |
ef0c2bb0 DT |
4803 | mutex_lock(&ls->ls_clear_proc_locks); |
4804 | ||
a1bc86e6 DT |
4805 | /* in-progress unlocks */ |
4806 | list_for_each_entry_safe(lkb, safe, &proc->unlocking, lkb_ownqueue) { | |
4807 | list_del_init(&lkb->lkb_ownqueue); | |
4808 | lkb->lkb_flags |= DLM_IFL_DEAD; | |
4809 | dlm_put_lkb(lkb); | |
4810 | } | |
4811 | ||
4812 | list_for_each_entry_safe(lkb, safe, &proc->asts, lkb_astqueue) { | |
8a358ca8 | 4813 | lkb->lkb_ast_type = 0; |
a1bc86e6 DT |
4814 | list_del(&lkb->lkb_astqueue); |
4815 | dlm_put_lkb(lkb); | |
4816 | } | |
4817 | ||
597d0cae | 4818 | mutex_unlock(&ls->ls_clear_proc_locks); |
85e86edf | 4819 | dlm_unlock_recovery(ls); |
597d0cae | 4820 | } |
a1bc86e6 | 4821 | |
8499137d DT |
4822 | static void purge_proc_locks(struct dlm_ls *ls, struct dlm_user_proc *proc) |
4823 | { | |
4824 | struct dlm_lkb *lkb, *safe; | |
4825 | ||
4826 | while (1) { | |
4827 | lkb = NULL; | |
4828 | spin_lock(&proc->locks_spin); | |
4829 | if (!list_empty(&proc->locks)) { | |
4830 | lkb = list_entry(proc->locks.next, struct dlm_lkb, | |
4831 | lkb_ownqueue); | |
4832 | list_del_init(&lkb->lkb_ownqueue); | |
4833 | } | |
4834 | spin_unlock(&proc->locks_spin); | |
4835 | ||
4836 | if (!lkb) | |
4837 | break; | |
4838 | ||
4839 | lkb->lkb_flags |= DLM_IFL_DEAD; | |
4840 | unlock_proc_lock(ls, lkb); | |
4841 | dlm_put_lkb(lkb); /* ref from proc->locks list */ | |
4842 | } | |
4843 | ||
4844 | spin_lock(&proc->locks_spin); | |
4845 | list_for_each_entry_safe(lkb, safe, &proc->unlocking, lkb_ownqueue) { | |
4846 | list_del_init(&lkb->lkb_ownqueue); | |
4847 | lkb->lkb_flags |= DLM_IFL_DEAD; | |
4848 | dlm_put_lkb(lkb); | |
4849 | } | |
4850 | spin_unlock(&proc->locks_spin); | |
4851 | ||
4852 | spin_lock(&proc->asts_spin); | |
4853 | list_for_each_entry_safe(lkb, safe, &proc->asts, lkb_astqueue) { | |
4854 | list_del(&lkb->lkb_astqueue); | |
4855 | dlm_put_lkb(lkb); | |
4856 | } | |
4857 | spin_unlock(&proc->asts_spin); | |
4858 | } | |
4859 | ||
4860 | /* pid of 0 means purge all orphans */ | |
4861 | ||
4862 | static void do_purge(struct dlm_ls *ls, int nodeid, int pid) | |
4863 | { | |
4864 | struct dlm_lkb *lkb, *safe; | |
4865 | ||
4866 | mutex_lock(&ls->ls_orphans_mutex); | |
4867 | list_for_each_entry_safe(lkb, safe, &ls->ls_orphans, lkb_ownqueue) { | |
4868 | if (pid && lkb->lkb_ownpid != pid) | |
4869 | continue; | |
4870 | unlock_proc_lock(ls, lkb); | |
4871 | list_del_init(&lkb->lkb_ownqueue); | |
4872 | dlm_put_lkb(lkb); | |
4873 | } | |
4874 | mutex_unlock(&ls->ls_orphans_mutex); | |
4875 | } | |
4876 | ||
4877 | static int send_purge(struct dlm_ls *ls, int nodeid, int pid) | |
4878 | { | |
4879 | struct dlm_message *ms; | |
4880 | struct dlm_mhandle *mh; | |
4881 | int error; | |
4882 | ||
4883 | error = _create_message(ls, sizeof(struct dlm_message), nodeid, | |
4884 | DLM_MSG_PURGE, &ms, &mh); | |
4885 | if (error) | |
4886 | return error; | |
4887 | ms->m_nodeid = nodeid; | |
4888 | ms->m_pid = pid; | |
4889 | ||
4890 | return send_message(mh, ms); | |
4891 | } | |
4892 | ||
4893 | int dlm_user_purge(struct dlm_ls *ls, struct dlm_user_proc *proc, | |
4894 | int nodeid, int pid) | |
4895 | { | |
4896 | int error = 0; | |
4897 | ||
4898 | if (nodeid != dlm_our_nodeid()) { | |
4899 | error = send_purge(ls, nodeid, pid); | |
4900 | } else { | |
85e86edf | 4901 | dlm_lock_recovery(ls); |
8499137d DT |
4902 | if (pid == current->pid) |
4903 | purge_proc_locks(ls, proc); | |
4904 | else | |
4905 | do_purge(ls, nodeid, pid); | |
85e86edf | 4906 | dlm_unlock_recovery(ls); |
8499137d DT |
4907 | } |
4908 | return error; | |
4909 | } | |
4910 |