Commit | Line | Data |
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e7fd4179 DT |
1 | /****************************************************************************** |
2 | ******************************************************************************* | |
3 | ** | |
7fe2b319 | 4 | ** Copyright (C) 2005-2010 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> |
5a0e3ad6 | 59 | #include <linux/slab.h> |
e7fd4179 | 60 | #include "dlm_internal.h" |
597d0cae | 61 | #include <linux/dlm_device.h> |
e7fd4179 DT |
62 | #include "memory.h" |
63 | #include "lowcomms.h" | |
64 | #include "requestqueue.h" | |
65 | #include "util.h" | |
66 | #include "dir.h" | |
67 | #include "member.h" | |
68 | #include "lockspace.h" | |
69 | #include "ast.h" | |
70 | #include "lock.h" | |
71 | #include "rcom.h" | |
72 | #include "recover.h" | |
73 | #include "lvb_table.h" | |
597d0cae | 74 | #include "user.h" |
e7fd4179 DT |
75 | #include "config.h" |
76 | ||
77 | static int send_request(struct dlm_rsb *r, struct dlm_lkb *lkb); | |
78 | static int send_convert(struct dlm_rsb *r, struct dlm_lkb *lkb); | |
79 | static int send_unlock(struct dlm_rsb *r, struct dlm_lkb *lkb); | |
80 | static int send_cancel(struct dlm_rsb *r, struct dlm_lkb *lkb); | |
81 | static int send_grant(struct dlm_rsb *r, struct dlm_lkb *lkb); | |
82 | static int send_bast(struct dlm_rsb *r, struct dlm_lkb *lkb, int mode); | |
83 | static int send_lookup(struct dlm_rsb *r, struct dlm_lkb *lkb); | |
84 | static int send_remove(struct dlm_rsb *r); | |
85 | static int _request_lock(struct dlm_rsb *r, struct dlm_lkb *lkb); | |
3ae1acf9 | 86 | static int _cancel_lock(struct dlm_rsb *r, struct dlm_lkb *lkb); |
e7fd4179 DT |
87 | static void __receive_convert_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, |
88 | struct dlm_message *ms); | |
89 | static int receive_extralen(struct dlm_message *ms); | |
8499137d | 90 | static void do_purge(struct dlm_ls *ls, int nodeid, int pid); |
3ae1acf9 | 91 | static void del_timeout(struct dlm_lkb *lkb); |
e7fd4179 DT |
92 | |
93 | /* | |
94 | * Lock compatibilty matrix - thanks Steve | |
95 | * UN = Unlocked state. Not really a state, used as a flag | |
96 | * PD = Padding. Used to make the matrix a nice power of two in size | |
97 | * Other states are the same as the VMS DLM. | |
98 | * Usage: matrix[grmode+1][rqmode+1] (although m[rq+1][gr+1] is the same) | |
99 | */ | |
100 | ||
101 | static const int __dlm_compat_matrix[8][8] = { | |
102 | /* UN NL CR CW PR PW EX PD */ | |
103 | {1, 1, 1, 1, 1, 1, 1, 0}, /* UN */ | |
104 | {1, 1, 1, 1, 1, 1, 1, 0}, /* NL */ | |
105 | {1, 1, 1, 1, 1, 1, 0, 0}, /* CR */ | |
106 | {1, 1, 1, 1, 0, 0, 0, 0}, /* CW */ | |
107 | {1, 1, 1, 0, 1, 0, 0, 0}, /* PR */ | |
108 | {1, 1, 1, 0, 0, 0, 0, 0}, /* PW */ | |
109 | {1, 1, 0, 0, 0, 0, 0, 0}, /* EX */ | |
110 | {0, 0, 0, 0, 0, 0, 0, 0} /* PD */ | |
111 | }; | |
112 | ||
113 | /* | |
114 | * This defines the direction of transfer of LVB data. | |
115 | * Granted mode is the row; requested mode is the column. | |
116 | * Usage: matrix[grmode+1][rqmode+1] | |
117 | * 1 = LVB is returned to the caller | |
118 | * 0 = LVB is written to the resource | |
119 | * -1 = nothing happens to the LVB | |
120 | */ | |
121 | ||
122 | const int dlm_lvb_operations[8][8] = { | |
123 | /* UN NL CR CW PR PW EX PD*/ | |
124 | { -1, 1, 1, 1, 1, 1, 1, -1 }, /* UN */ | |
125 | { -1, 1, 1, 1, 1, 1, 1, 0 }, /* NL */ | |
126 | { -1, -1, 1, 1, 1, 1, 1, 0 }, /* CR */ | |
127 | { -1, -1, -1, 1, 1, 1, 1, 0 }, /* CW */ | |
128 | { -1, -1, -1, -1, 1, 1, 1, 0 }, /* PR */ | |
129 | { -1, 0, 0, 0, 0, 0, 1, 0 }, /* PW */ | |
130 | { -1, 0, 0, 0, 0, 0, 0, 0 }, /* EX */ | |
131 | { -1, 0, 0, 0, 0, 0, 0, 0 } /* PD */ | |
132 | }; | |
e7fd4179 DT |
133 | |
134 | #define modes_compat(gr, rq) \ | |
135 | __dlm_compat_matrix[(gr)->lkb_grmode + 1][(rq)->lkb_rqmode + 1] | |
136 | ||
137 | int dlm_modes_compat(int mode1, int mode2) | |
138 | { | |
139 | return __dlm_compat_matrix[mode1 + 1][mode2 + 1]; | |
140 | } | |
141 | ||
142 | /* | |
143 | * Compatibility matrix for conversions with QUECVT set. | |
144 | * Granted mode is the row; requested mode is the column. | |
145 | * Usage: matrix[grmode+1][rqmode+1] | |
146 | */ | |
147 | ||
148 | static const int __quecvt_compat_matrix[8][8] = { | |
149 | /* UN NL CR CW PR PW EX PD */ | |
150 | {0, 0, 0, 0, 0, 0, 0, 0}, /* UN */ | |
151 | {0, 0, 1, 1, 1, 1, 1, 0}, /* NL */ | |
152 | {0, 0, 0, 1, 1, 1, 1, 0}, /* CR */ | |
153 | {0, 0, 0, 0, 1, 1, 1, 0}, /* CW */ | |
154 | {0, 0, 0, 1, 0, 1, 1, 0}, /* PR */ | |
155 | {0, 0, 0, 0, 0, 0, 1, 0}, /* PW */ | |
156 | {0, 0, 0, 0, 0, 0, 0, 0}, /* EX */ | |
157 | {0, 0, 0, 0, 0, 0, 0, 0} /* PD */ | |
158 | }; | |
159 | ||
597d0cae | 160 | void dlm_print_lkb(struct dlm_lkb *lkb) |
e7fd4179 DT |
161 | { |
162 | printk(KERN_ERR "lkb: nodeid %d id %x remid %x exflags %x flags %x\n" | |
8304d6f2 | 163 | " status %d rqmode %d grmode %d wait_type %d\n", |
e7fd4179 DT |
164 | lkb->lkb_nodeid, lkb->lkb_id, lkb->lkb_remid, lkb->lkb_exflags, |
165 | lkb->lkb_flags, lkb->lkb_status, lkb->lkb_rqmode, | |
8304d6f2 | 166 | lkb->lkb_grmode, lkb->lkb_wait_type); |
e7fd4179 DT |
167 | } |
168 | ||
170e19ab | 169 | static void dlm_print_rsb(struct dlm_rsb *r) |
e7fd4179 DT |
170 | { |
171 | printk(KERN_ERR "rsb: nodeid %d flags %lx first %x rlc %d name %s\n", | |
172 | r->res_nodeid, r->res_flags, r->res_first_lkid, | |
173 | r->res_recover_locks_count, r->res_name); | |
174 | } | |
175 | ||
a345da3e DT |
176 | void dlm_dump_rsb(struct dlm_rsb *r) |
177 | { | |
178 | struct dlm_lkb *lkb; | |
179 | ||
180 | dlm_print_rsb(r); | |
181 | ||
182 | printk(KERN_ERR "rsb: root_list empty %d recover_list empty %d\n", | |
183 | list_empty(&r->res_root_list), list_empty(&r->res_recover_list)); | |
184 | printk(KERN_ERR "rsb lookup list\n"); | |
185 | list_for_each_entry(lkb, &r->res_lookup, lkb_rsb_lookup) | |
186 | dlm_print_lkb(lkb); | |
187 | printk(KERN_ERR "rsb grant queue:\n"); | |
188 | list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) | |
189 | dlm_print_lkb(lkb); | |
190 | printk(KERN_ERR "rsb convert queue:\n"); | |
191 | list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) | |
192 | dlm_print_lkb(lkb); | |
193 | printk(KERN_ERR "rsb wait queue:\n"); | |
194 | list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue) | |
195 | dlm_print_lkb(lkb); | |
196 | } | |
197 | ||
e7fd4179 DT |
198 | /* Threads cannot use the lockspace while it's being recovered */ |
199 | ||
85e86edf | 200 | static inline void dlm_lock_recovery(struct dlm_ls *ls) |
e7fd4179 DT |
201 | { |
202 | down_read(&ls->ls_in_recovery); | |
203 | } | |
204 | ||
85e86edf | 205 | void dlm_unlock_recovery(struct dlm_ls *ls) |
e7fd4179 DT |
206 | { |
207 | up_read(&ls->ls_in_recovery); | |
208 | } | |
209 | ||
85e86edf | 210 | int dlm_lock_recovery_try(struct dlm_ls *ls) |
e7fd4179 DT |
211 | { |
212 | return down_read_trylock(&ls->ls_in_recovery); | |
213 | } | |
214 | ||
215 | static inline int can_be_queued(struct dlm_lkb *lkb) | |
216 | { | |
217 | return !(lkb->lkb_exflags & DLM_LKF_NOQUEUE); | |
218 | } | |
219 | ||
220 | static inline int force_blocking_asts(struct dlm_lkb *lkb) | |
221 | { | |
222 | return (lkb->lkb_exflags & DLM_LKF_NOQUEUEBAST); | |
223 | } | |
224 | ||
225 | static inline int is_demoted(struct dlm_lkb *lkb) | |
226 | { | |
227 | return (lkb->lkb_sbflags & DLM_SBF_DEMOTED); | |
228 | } | |
229 | ||
7d3c1feb DT |
230 | static inline int is_altmode(struct dlm_lkb *lkb) |
231 | { | |
232 | return (lkb->lkb_sbflags & DLM_SBF_ALTMODE); | |
233 | } | |
234 | ||
235 | static inline int is_granted(struct dlm_lkb *lkb) | |
236 | { | |
237 | return (lkb->lkb_status == DLM_LKSTS_GRANTED); | |
238 | } | |
239 | ||
e7fd4179 DT |
240 | static inline int is_remote(struct dlm_rsb *r) |
241 | { | |
242 | DLM_ASSERT(r->res_nodeid >= 0, dlm_print_rsb(r);); | |
243 | return !!r->res_nodeid; | |
244 | } | |
245 | ||
246 | static inline int is_process_copy(struct dlm_lkb *lkb) | |
247 | { | |
248 | return (lkb->lkb_nodeid && !(lkb->lkb_flags & DLM_IFL_MSTCPY)); | |
249 | } | |
250 | ||
251 | static inline int is_master_copy(struct dlm_lkb *lkb) | |
252 | { | |
253 | if (lkb->lkb_flags & DLM_IFL_MSTCPY) | |
254 | DLM_ASSERT(lkb->lkb_nodeid, dlm_print_lkb(lkb);); | |
90135925 | 255 | return (lkb->lkb_flags & DLM_IFL_MSTCPY) ? 1 : 0; |
e7fd4179 DT |
256 | } |
257 | ||
258 | static inline int middle_conversion(struct dlm_lkb *lkb) | |
259 | { | |
260 | if ((lkb->lkb_grmode==DLM_LOCK_PR && lkb->lkb_rqmode==DLM_LOCK_CW) || | |
261 | (lkb->lkb_rqmode==DLM_LOCK_PR && lkb->lkb_grmode==DLM_LOCK_CW)) | |
90135925 DT |
262 | return 1; |
263 | return 0; | |
e7fd4179 DT |
264 | } |
265 | ||
266 | static inline int down_conversion(struct dlm_lkb *lkb) | |
267 | { | |
268 | return (!middle_conversion(lkb) && lkb->lkb_rqmode < lkb->lkb_grmode); | |
269 | } | |
270 | ||
ef0c2bb0 DT |
271 | static inline int is_overlap_unlock(struct dlm_lkb *lkb) |
272 | { | |
273 | return lkb->lkb_flags & DLM_IFL_OVERLAP_UNLOCK; | |
274 | } | |
275 | ||
276 | static inline int is_overlap_cancel(struct dlm_lkb *lkb) | |
277 | { | |
278 | return lkb->lkb_flags & DLM_IFL_OVERLAP_CANCEL; | |
279 | } | |
280 | ||
281 | static inline int is_overlap(struct dlm_lkb *lkb) | |
282 | { | |
283 | return (lkb->lkb_flags & (DLM_IFL_OVERLAP_UNLOCK | | |
284 | DLM_IFL_OVERLAP_CANCEL)); | |
285 | } | |
286 | ||
e7fd4179 DT |
287 | static void queue_cast(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv) |
288 | { | |
289 | if (is_master_copy(lkb)) | |
290 | return; | |
291 | ||
3ae1acf9 DT |
292 | del_timeout(lkb); |
293 | ||
e7fd4179 DT |
294 | DLM_ASSERT(lkb->lkb_lksb, dlm_print_lkb(lkb);); |
295 | ||
3ae1acf9 DT |
296 | /* if the operation was a cancel, then return -DLM_ECANCEL, if a |
297 | timeout caused the cancel then return -ETIMEDOUT */ | |
298 | if (rv == -DLM_ECANCEL && (lkb->lkb_flags & DLM_IFL_TIMEOUT_CANCEL)) { | |
299 | lkb->lkb_flags &= ~DLM_IFL_TIMEOUT_CANCEL; | |
300 | rv = -ETIMEDOUT; | |
301 | } | |
302 | ||
8b4021fa DT |
303 | if (rv == -DLM_ECANCEL && (lkb->lkb_flags & DLM_IFL_DEADLOCK_CANCEL)) { |
304 | lkb->lkb_flags &= ~DLM_IFL_DEADLOCK_CANCEL; | |
305 | rv = -EDEADLK; | |
306 | } | |
307 | ||
8304d6f2 | 308 | dlm_add_ast(lkb, DLM_CB_CAST, lkb->lkb_grmode, rv, lkb->lkb_sbflags); |
e7fd4179 DT |
309 | } |
310 | ||
ef0c2bb0 DT |
311 | static inline void queue_cast_overlap(struct dlm_rsb *r, struct dlm_lkb *lkb) |
312 | { | |
313 | queue_cast(r, lkb, | |
314 | is_overlap_unlock(lkb) ? -DLM_EUNLOCK : -DLM_ECANCEL); | |
315 | } | |
316 | ||
e7fd4179 DT |
317 | static void queue_bast(struct dlm_rsb *r, struct dlm_lkb *lkb, int rqmode) |
318 | { | |
b6fa8796 | 319 | if (is_master_copy(lkb)) { |
e7fd4179 | 320 | send_bast(r, lkb, rqmode); |
b6fa8796 | 321 | } else { |
8304d6f2 | 322 | dlm_add_ast(lkb, DLM_CB_BAST, rqmode, 0, 0); |
b6fa8796 | 323 | } |
e7fd4179 DT |
324 | } |
325 | ||
326 | /* | |
327 | * Basic operations on rsb's and lkb's | |
328 | */ | |
329 | ||
330 | static struct dlm_rsb *create_rsb(struct dlm_ls *ls, char *name, int len) | |
331 | { | |
332 | struct dlm_rsb *r; | |
333 | ||
52bda2b5 | 334 | r = dlm_allocate_rsb(ls, len); |
e7fd4179 DT |
335 | if (!r) |
336 | return NULL; | |
337 | ||
338 | r->res_ls = ls; | |
339 | r->res_length = len; | |
340 | memcpy(r->res_name, name, len); | |
90135925 | 341 | mutex_init(&r->res_mutex); |
e7fd4179 DT |
342 | |
343 | INIT_LIST_HEAD(&r->res_lookup); | |
344 | INIT_LIST_HEAD(&r->res_grantqueue); | |
345 | INIT_LIST_HEAD(&r->res_convertqueue); | |
346 | INIT_LIST_HEAD(&r->res_waitqueue); | |
347 | INIT_LIST_HEAD(&r->res_root_list); | |
348 | INIT_LIST_HEAD(&r->res_recover_list); | |
349 | ||
350 | return r; | |
351 | } | |
352 | ||
353 | static int search_rsb_list(struct list_head *head, char *name, int len, | |
354 | unsigned int flags, struct dlm_rsb **r_ret) | |
355 | { | |
356 | struct dlm_rsb *r; | |
357 | int error = 0; | |
358 | ||
359 | list_for_each_entry(r, head, res_hashchain) { | |
360 | if (len == r->res_length && !memcmp(name, r->res_name, len)) | |
361 | goto found; | |
362 | } | |
18c60c0a | 363 | *r_ret = NULL; |
597d0cae | 364 | return -EBADR; |
e7fd4179 DT |
365 | |
366 | found: | |
367 | if (r->res_nodeid && (flags & R_MASTER)) | |
368 | error = -ENOTBLK; | |
369 | *r_ret = r; | |
370 | return error; | |
371 | } | |
372 | ||
373 | static int _search_rsb(struct dlm_ls *ls, char *name, int len, int b, | |
374 | unsigned int flags, struct dlm_rsb **r_ret) | |
375 | { | |
376 | struct dlm_rsb *r; | |
377 | int error; | |
378 | ||
379 | error = search_rsb_list(&ls->ls_rsbtbl[b].list, name, len, flags, &r); | |
380 | if (!error) { | |
381 | kref_get(&r->res_ref); | |
382 | goto out; | |
383 | } | |
384 | error = search_rsb_list(&ls->ls_rsbtbl[b].toss, name, len, flags, &r); | |
385 | if (error) | |
386 | goto out; | |
387 | ||
388 | list_move(&r->res_hashchain, &ls->ls_rsbtbl[b].list); | |
389 | ||
390 | if (dlm_no_directory(ls)) | |
391 | goto out; | |
392 | ||
393 | if (r->res_nodeid == -1) { | |
394 | rsb_clear_flag(r, RSB_MASTER_UNCERTAIN); | |
395 | r->res_first_lkid = 0; | |
396 | } else if (r->res_nodeid > 0) { | |
397 | rsb_set_flag(r, RSB_MASTER_UNCERTAIN); | |
398 | r->res_first_lkid = 0; | |
399 | } else { | |
400 | DLM_ASSERT(r->res_nodeid == 0, dlm_print_rsb(r);); | |
401 | DLM_ASSERT(!rsb_flag(r, RSB_MASTER_UNCERTAIN),); | |
402 | } | |
403 | out: | |
404 | *r_ret = r; | |
405 | return error; | |
406 | } | |
407 | ||
408 | static int search_rsb(struct dlm_ls *ls, char *name, int len, int b, | |
409 | unsigned int flags, struct dlm_rsb **r_ret) | |
410 | { | |
411 | int error; | |
c7be761a | 412 | spin_lock(&ls->ls_rsbtbl[b].lock); |
e7fd4179 | 413 | error = _search_rsb(ls, name, len, b, flags, r_ret); |
c7be761a | 414 | spin_unlock(&ls->ls_rsbtbl[b].lock); |
e7fd4179 DT |
415 | return error; |
416 | } | |
417 | ||
418 | /* | |
419 | * Find rsb in rsbtbl and potentially create/add one | |
420 | * | |
421 | * Delaying the release of rsb's has a similar benefit to applications keeping | |
422 | * NL locks on an rsb, but without the guarantee that the cached master value | |
423 | * will still be valid when the rsb is reused. Apps aren't always smart enough | |
424 | * to keep NL locks on an rsb that they may lock again shortly; this can lead | |
425 | * to excessive master lookups and removals if we don't delay the release. | |
426 | * | |
427 | * Searching for an rsb means looking through both the normal list and toss | |
428 | * list. When found on the toss list the rsb is moved to the normal list with | |
429 | * ref count of 1; when found on normal list the ref count is incremented. | |
430 | */ | |
431 | ||
432 | static int find_rsb(struct dlm_ls *ls, char *name, int namelen, | |
433 | unsigned int flags, struct dlm_rsb **r_ret) | |
434 | { | |
a566a6b1 | 435 | struct dlm_rsb *r = NULL, *tmp; |
e7fd4179 | 436 | uint32_t hash, bucket; |
ef58bcca AV |
437 | int error = -EINVAL; |
438 | ||
439 | if (namelen > DLM_RESNAME_MAXLEN) | |
440 | goto out; | |
e7fd4179 DT |
441 | |
442 | if (dlm_no_directory(ls)) | |
443 | flags |= R_CREATE; | |
444 | ||
ef58bcca | 445 | error = 0; |
e7fd4179 DT |
446 | hash = jhash(name, namelen, 0); |
447 | bucket = hash & (ls->ls_rsbtbl_size - 1); | |
448 | ||
449 | error = search_rsb(ls, name, namelen, bucket, flags, &r); | |
450 | if (!error) | |
451 | goto out; | |
452 | ||
597d0cae | 453 | if (error == -EBADR && !(flags & R_CREATE)) |
e7fd4179 DT |
454 | goto out; |
455 | ||
456 | /* the rsb was found but wasn't a master copy */ | |
457 | if (error == -ENOTBLK) | |
458 | goto out; | |
459 | ||
460 | error = -ENOMEM; | |
461 | r = create_rsb(ls, name, namelen); | |
462 | if (!r) | |
463 | goto out; | |
464 | ||
465 | r->res_hash = hash; | |
466 | r->res_bucket = bucket; | |
467 | r->res_nodeid = -1; | |
468 | kref_init(&r->res_ref); | |
469 | ||
470 | /* With no directory, the master can be set immediately */ | |
471 | if (dlm_no_directory(ls)) { | |
472 | int nodeid = dlm_dir_nodeid(r); | |
473 | if (nodeid == dlm_our_nodeid()) | |
474 | nodeid = 0; | |
475 | r->res_nodeid = nodeid; | |
476 | } | |
477 | ||
c7be761a | 478 | spin_lock(&ls->ls_rsbtbl[bucket].lock); |
e7fd4179 DT |
479 | error = _search_rsb(ls, name, namelen, bucket, 0, &tmp); |
480 | if (!error) { | |
c7be761a | 481 | spin_unlock(&ls->ls_rsbtbl[bucket].lock); |
52bda2b5 | 482 | dlm_free_rsb(r); |
e7fd4179 DT |
483 | r = tmp; |
484 | goto out; | |
485 | } | |
486 | list_add(&r->res_hashchain, &ls->ls_rsbtbl[bucket].list); | |
c7be761a | 487 | spin_unlock(&ls->ls_rsbtbl[bucket].lock); |
e7fd4179 DT |
488 | error = 0; |
489 | out: | |
490 | *r_ret = r; | |
491 | return error; | |
492 | } | |
493 | ||
e7fd4179 DT |
494 | /* This is only called to add a reference when the code already holds |
495 | a valid reference to the rsb, so there's no need for locking. */ | |
496 | ||
497 | static inline void hold_rsb(struct dlm_rsb *r) | |
498 | { | |
499 | kref_get(&r->res_ref); | |
500 | } | |
501 | ||
502 | void dlm_hold_rsb(struct dlm_rsb *r) | |
503 | { | |
504 | hold_rsb(r); | |
505 | } | |
506 | ||
507 | static void toss_rsb(struct kref *kref) | |
508 | { | |
509 | struct dlm_rsb *r = container_of(kref, struct dlm_rsb, res_ref); | |
510 | struct dlm_ls *ls = r->res_ls; | |
511 | ||
512 | DLM_ASSERT(list_empty(&r->res_root_list), dlm_print_rsb(r);); | |
513 | kref_init(&r->res_ref); | |
514 | list_move(&r->res_hashchain, &ls->ls_rsbtbl[r->res_bucket].toss); | |
515 | r->res_toss_time = jiffies; | |
516 | if (r->res_lvbptr) { | |
52bda2b5 | 517 | dlm_free_lvb(r->res_lvbptr); |
e7fd4179 DT |
518 | r->res_lvbptr = NULL; |
519 | } | |
520 | } | |
521 | ||
25985edc | 522 | /* When all references to the rsb are gone it's transferred to |
e7fd4179 DT |
523 | the tossed list for later disposal. */ |
524 | ||
525 | static void put_rsb(struct dlm_rsb *r) | |
526 | { | |
527 | struct dlm_ls *ls = r->res_ls; | |
528 | uint32_t bucket = r->res_bucket; | |
529 | ||
c7be761a | 530 | spin_lock(&ls->ls_rsbtbl[bucket].lock); |
e7fd4179 | 531 | kref_put(&r->res_ref, toss_rsb); |
c7be761a | 532 | spin_unlock(&ls->ls_rsbtbl[bucket].lock); |
e7fd4179 DT |
533 | } |
534 | ||
535 | void dlm_put_rsb(struct dlm_rsb *r) | |
536 | { | |
537 | put_rsb(r); | |
538 | } | |
539 | ||
540 | /* See comment for unhold_lkb */ | |
541 | ||
542 | static void unhold_rsb(struct dlm_rsb *r) | |
543 | { | |
544 | int rv; | |
545 | rv = kref_put(&r->res_ref, toss_rsb); | |
a345da3e | 546 | DLM_ASSERT(!rv, dlm_dump_rsb(r);); |
e7fd4179 DT |
547 | } |
548 | ||
549 | static void kill_rsb(struct kref *kref) | |
550 | { | |
551 | struct dlm_rsb *r = container_of(kref, struct dlm_rsb, res_ref); | |
552 | ||
553 | /* All work is done after the return from kref_put() so we | |
554 | can release the write_lock before the remove and free. */ | |
555 | ||
a345da3e DT |
556 | DLM_ASSERT(list_empty(&r->res_lookup), dlm_dump_rsb(r);); |
557 | DLM_ASSERT(list_empty(&r->res_grantqueue), dlm_dump_rsb(r);); | |
558 | DLM_ASSERT(list_empty(&r->res_convertqueue), dlm_dump_rsb(r);); | |
559 | DLM_ASSERT(list_empty(&r->res_waitqueue), dlm_dump_rsb(r);); | |
560 | DLM_ASSERT(list_empty(&r->res_root_list), dlm_dump_rsb(r);); | |
561 | DLM_ASSERT(list_empty(&r->res_recover_list), dlm_dump_rsb(r);); | |
e7fd4179 DT |
562 | } |
563 | ||
564 | /* Attaching/detaching lkb's from rsb's is for rsb reference counting. | |
565 | The rsb must exist as long as any lkb's for it do. */ | |
566 | ||
567 | static void attach_lkb(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
568 | { | |
569 | hold_rsb(r); | |
570 | lkb->lkb_resource = r; | |
571 | } | |
572 | ||
573 | static void detach_lkb(struct dlm_lkb *lkb) | |
574 | { | |
575 | if (lkb->lkb_resource) { | |
576 | put_rsb(lkb->lkb_resource); | |
577 | lkb->lkb_resource = NULL; | |
578 | } | |
579 | } | |
580 | ||
581 | static int create_lkb(struct dlm_ls *ls, struct dlm_lkb **lkb_ret) | |
582 | { | |
583 | struct dlm_lkb *lkb, *tmp; | |
584 | uint32_t lkid = 0; | |
585 | uint16_t bucket; | |
586 | ||
52bda2b5 | 587 | lkb = dlm_allocate_lkb(ls); |
e7fd4179 DT |
588 | if (!lkb) |
589 | return -ENOMEM; | |
590 | ||
591 | lkb->lkb_nodeid = -1; | |
592 | lkb->lkb_grmode = DLM_LOCK_IV; | |
593 | kref_init(&lkb->lkb_ref); | |
34e22bed | 594 | INIT_LIST_HEAD(&lkb->lkb_ownqueue); |
ef0c2bb0 | 595 | INIT_LIST_HEAD(&lkb->lkb_rsb_lookup); |
3ae1acf9 | 596 | INIT_LIST_HEAD(&lkb->lkb_time_list); |
8304d6f2 | 597 | INIT_LIST_HEAD(&lkb->lkb_astqueue); |
e7fd4179 DT |
598 | |
599 | get_random_bytes(&bucket, sizeof(bucket)); | |
600 | bucket &= (ls->ls_lkbtbl_size - 1); | |
601 | ||
602 | write_lock(&ls->ls_lkbtbl[bucket].lock); | |
603 | ||
604 | /* counter can roll over so we must verify lkid is not in use */ | |
605 | ||
606 | while (lkid == 0) { | |
ce03f12b | 607 | lkid = (bucket << 16) | ls->ls_lkbtbl[bucket].counter++; |
e7fd4179 DT |
608 | |
609 | list_for_each_entry(tmp, &ls->ls_lkbtbl[bucket].list, | |
610 | lkb_idtbl_list) { | |
611 | if (tmp->lkb_id != lkid) | |
612 | continue; | |
613 | lkid = 0; | |
614 | break; | |
615 | } | |
616 | } | |
617 | ||
618 | lkb->lkb_id = lkid; | |
619 | list_add(&lkb->lkb_idtbl_list, &ls->ls_lkbtbl[bucket].list); | |
620 | write_unlock(&ls->ls_lkbtbl[bucket].lock); | |
621 | ||
622 | *lkb_ret = lkb; | |
623 | return 0; | |
624 | } | |
625 | ||
626 | static struct dlm_lkb *__find_lkb(struct dlm_ls *ls, uint32_t lkid) | |
627 | { | |
e7fd4179 | 628 | struct dlm_lkb *lkb; |
ce03f12b | 629 | uint16_t bucket = (lkid >> 16); |
e7fd4179 DT |
630 | |
631 | list_for_each_entry(lkb, &ls->ls_lkbtbl[bucket].list, lkb_idtbl_list) { | |
632 | if (lkb->lkb_id == lkid) | |
633 | return lkb; | |
634 | } | |
635 | return NULL; | |
636 | } | |
637 | ||
638 | static int find_lkb(struct dlm_ls *ls, uint32_t lkid, struct dlm_lkb **lkb_ret) | |
639 | { | |
640 | struct dlm_lkb *lkb; | |
ce03f12b | 641 | uint16_t bucket = (lkid >> 16); |
e7fd4179 DT |
642 | |
643 | if (bucket >= ls->ls_lkbtbl_size) | |
644 | return -EBADSLT; | |
645 | ||
646 | read_lock(&ls->ls_lkbtbl[bucket].lock); | |
647 | lkb = __find_lkb(ls, lkid); | |
648 | if (lkb) | |
649 | kref_get(&lkb->lkb_ref); | |
650 | read_unlock(&ls->ls_lkbtbl[bucket].lock); | |
651 | ||
652 | *lkb_ret = lkb; | |
653 | return lkb ? 0 : -ENOENT; | |
654 | } | |
655 | ||
656 | static void kill_lkb(struct kref *kref) | |
657 | { | |
658 | struct dlm_lkb *lkb = container_of(kref, struct dlm_lkb, lkb_ref); | |
659 | ||
660 | /* All work is done after the return from kref_put() so we | |
661 | can release the write_lock before the detach_lkb */ | |
662 | ||
663 | DLM_ASSERT(!lkb->lkb_status, dlm_print_lkb(lkb);); | |
664 | } | |
665 | ||
b3f58d8f DT |
666 | /* __put_lkb() is used when an lkb may not have an rsb attached to |
667 | it so we need to provide the lockspace explicitly */ | |
668 | ||
669 | static int __put_lkb(struct dlm_ls *ls, struct dlm_lkb *lkb) | |
e7fd4179 | 670 | { |
ce03f12b | 671 | uint16_t bucket = (lkb->lkb_id >> 16); |
e7fd4179 DT |
672 | |
673 | write_lock(&ls->ls_lkbtbl[bucket].lock); | |
674 | if (kref_put(&lkb->lkb_ref, kill_lkb)) { | |
675 | list_del(&lkb->lkb_idtbl_list); | |
676 | write_unlock(&ls->ls_lkbtbl[bucket].lock); | |
677 | ||
678 | detach_lkb(lkb); | |
679 | ||
680 | /* for local/process lkbs, lvbptr points to caller's lksb */ | |
681 | if (lkb->lkb_lvbptr && is_master_copy(lkb)) | |
52bda2b5 DT |
682 | dlm_free_lvb(lkb->lkb_lvbptr); |
683 | dlm_free_lkb(lkb); | |
e7fd4179 DT |
684 | return 1; |
685 | } else { | |
686 | write_unlock(&ls->ls_lkbtbl[bucket].lock); | |
687 | return 0; | |
688 | } | |
689 | } | |
690 | ||
691 | int dlm_put_lkb(struct dlm_lkb *lkb) | |
692 | { | |
b3f58d8f DT |
693 | struct dlm_ls *ls; |
694 | ||
695 | DLM_ASSERT(lkb->lkb_resource, dlm_print_lkb(lkb);); | |
696 | DLM_ASSERT(lkb->lkb_resource->res_ls, dlm_print_lkb(lkb);); | |
697 | ||
698 | ls = lkb->lkb_resource->res_ls; | |
699 | return __put_lkb(ls, lkb); | |
e7fd4179 DT |
700 | } |
701 | ||
702 | /* This is only called to add a reference when the code already holds | |
703 | a valid reference to the lkb, so there's no need for locking. */ | |
704 | ||
705 | static inline void hold_lkb(struct dlm_lkb *lkb) | |
706 | { | |
707 | kref_get(&lkb->lkb_ref); | |
708 | } | |
709 | ||
710 | /* This is called when we need to remove a reference and are certain | |
711 | it's not the last ref. e.g. del_lkb is always called between a | |
712 | find_lkb/put_lkb and is always the inverse of a previous add_lkb. | |
713 | put_lkb would work fine, but would involve unnecessary locking */ | |
714 | ||
715 | static inline void unhold_lkb(struct dlm_lkb *lkb) | |
716 | { | |
717 | int rv; | |
718 | rv = kref_put(&lkb->lkb_ref, kill_lkb); | |
719 | DLM_ASSERT(!rv, dlm_print_lkb(lkb);); | |
720 | } | |
721 | ||
722 | static void lkb_add_ordered(struct list_head *new, struct list_head *head, | |
723 | int mode) | |
724 | { | |
725 | struct dlm_lkb *lkb = NULL; | |
726 | ||
727 | list_for_each_entry(lkb, head, lkb_statequeue) | |
728 | if (lkb->lkb_rqmode < mode) | |
729 | break; | |
730 | ||
99fb19d4 | 731 | __list_add(new, lkb->lkb_statequeue.prev, &lkb->lkb_statequeue); |
e7fd4179 DT |
732 | } |
733 | ||
734 | /* add/remove lkb to rsb's grant/convert/wait queue */ | |
735 | ||
736 | static void add_lkb(struct dlm_rsb *r, struct dlm_lkb *lkb, int status) | |
737 | { | |
738 | kref_get(&lkb->lkb_ref); | |
739 | ||
740 | DLM_ASSERT(!lkb->lkb_status, dlm_print_lkb(lkb);); | |
741 | ||
eeda418d DT |
742 | lkb->lkb_timestamp = ktime_get(); |
743 | ||
e7fd4179 DT |
744 | lkb->lkb_status = status; |
745 | ||
746 | switch (status) { | |
747 | case DLM_LKSTS_WAITING: | |
748 | if (lkb->lkb_exflags & DLM_LKF_HEADQUE) | |
749 | list_add(&lkb->lkb_statequeue, &r->res_waitqueue); | |
750 | else | |
751 | list_add_tail(&lkb->lkb_statequeue, &r->res_waitqueue); | |
752 | break; | |
753 | case DLM_LKSTS_GRANTED: | |
754 | /* convention says granted locks kept in order of grmode */ | |
755 | lkb_add_ordered(&lkb->lkb_statequeue, &r->res_grantqueue, | |
756 | lkb->lkb_grmode); | |
757 | break; | |
758 | case DLM_LKSTS_CONVERT: | |
759 | if (lkb->lkb_exflags & DLM_LKF_HEADQUE) | |
760 | list_add(&lkb->lkb_statequeue, &r->res_convertqueue); | |
761 | else | |
762 | list_add_tail(&lkb->lkb_statequeue, | |
763 | &r->res_convertqueue); | |
764 | break; | |
765 | default: | |
766 | DLM_ASSERT(0, dlm_print_lkb(lkb); printk("sts=%d\n", status);); | |
767 | } | |
768 | } | |
769 | ||
770 | static void del_lkb(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
771 | { | |
772 | lkb->lkb_status = 0; | |
773 | list_del(&lkb->lkb_statequeue); | |
774 | unhold_lkb(lkb); | |
775 | } | |
776 | ||
777 | static void move_lkb(struct dlm_rsb *r, struct dlm_lkb *lkb, int sts) | |
778 | { | |
779 | hold_lkb(lkb); | |
780 | del_lkb(r, lkb); | |
781 | add_lkb(r, lkb, sts); | |
782 | unhold_lkb(lkb); | |
783 | } | |
784 | ||
ef0c2bb0 DT |
785 | static int msg_reply_type(int mstype) |
786 | { | |
787 | switch (mstype) { | |
788 | case DLM_MSG_REQUEST: | |
789 | return DLM_MSG_REQUEST_REPLY; | |
790 | case DLM_MSG_CONVERT: | |
791 | return DLM_MSG_CONVERT_REPLY; | |
792 | case DLM_MSG_UNLOCK: | |
793 | return DLM_MSG_UNLOCK_REPLY; | |
794 | case DLM_MSG_CANCEL: | |
795 | return DLM_MSG_CANCEL_REPLY; | |
796 | case DLM_MSG_LOOKUP: | |
797 | return DLM_MSG_LOOKUP_REPLY; | |
798 | } | |
799 | return -1; | |
800 | } | |
801 | ||
e7fd4179 DT |
802 | /* add/remove lkb from global waiters list of lkb's waiting for |
803 | a reply from a remote node */ | |
804 | ||
ef0c2bb0 | 805 | static int add_to_waiters(struct dlm_lkb *lkb, int mstype) |
e7fd4179 DT |
806 | { |
807 | struct dlm_ls *ls = lkb->lkb_resource->res_ls; | |
ef0c2bb0 | 808 | int error = 0; |
e7fd4179 | 809 | |
90135925 | 810 | mutex_lock(&ls->ls_waiters_mutex); |
ef0c2bb0 DT |
811 | |
812 | if (is_overlap_unlock(lkb) || | |
813 | (is_overlap_cancel(lkb) && (mstype == DLM_MSG_CANCEL))) { | |
814 | error = -EINVAL; | |
815 | goto out; | |
816 | } | |
817 | ||
818 | if (lkb->lkb_wait_type || is_overlap_cancel(lkb)) { | |
819 | switch (mstype) { | |
820 | case DLM_MSG_UNLOCK: | |
821 | lkb->lkb_flags |= DLM_IFL_OVERLAP_UNLOCK; | |
822 | break; | |
823 | case DLM_MSG_CANCEL: | |
824 | lkb->lkb_flags |= DLM_IFL_OVERLAP_CANCEL; | |
825 | break; | |
826 | default: | |
827 | error = -EBUSY; | |
828 | goto out; | |
829 | } | |
830 | lkb->lkb_wait_count++; | |
831 | hold_lkb(lkb); | |
832 | ||
43279e53 | 833 | log_debug(ls, "addwait %x cur %d overlap %d count %d f %x", |
ef0c2bb0 DT |
834 | lkb->lkb_id, lkb->lkb_wait_type, mstype, |
835 | lkb->lkb_wait_count, lkb->lkb_flags); | |
e7fd4179 DT |
836 | goto out; |
837 | } | |
ef0c2bb0 DT |
838 | |
839 | DLM_ASSERT(!lkb->lkb_wait_count, | |
840 | dlm_print_lkb(lkb); | |
841 | printk("wait_count %d\n", lkb->lkb_wait_count);); | |
842 | ||
843 | lkb->lkb_wait_count++; | |
e7fd4179 | 844 | lkb->lkb_wait_type = mstype; |
ef0c2bb0 | 845 | hold_lkb(lkb); |
e7fd4179 DT |
846 | list_add(&lkb->lkb_wait_reply, &ls->ls_waiters); |
847 | out: | |
ef0c2bb0 | 848 | if (error) |
43279e53 | 849 | log_error(ls, "addwait error %x %d flags %x %d %d %s", |
ef0c2bb0 DT |
850 | lkb->lkb_id, error, lkb->lkb_flags, mstype, |
851 | lkb->lkb_wait_type, lkb->lkb_resource->res_name); | |
90135925 | 852 | mutex_unlock(&ls->ls_waiters_mutex); |
ef0c2bb0 | 853 | return error; |
e7fd4179 DT |
854 | } |
855 | ||
b790c3b7 DT |
856 | /* We clear the RESEND flag because we might be taking an lkb off the waiters |
857 | list as part of process_requestqueue (e.g. a lookup that has an optimized | |
858 | request reply on the requestqueue) between dlm_recover_waiters_pre() which | |
859 | set RESEND and dlm_recover_waiters_post() */ | |
860 | ||
43279e53 DT |
861 | static int _remove_from_waiters(struct dlm_lkb *lkb, int mstype, |
862 | struct dlm_message *ms) | |
e7fd4179 | 863 | { |
ef0c2bb0 DT |
864 | struct dlm_ls *ls = lkb->lkb_resource->res_ls; |
865 | int overlap_done = 0; | |
e7fd4179 | 866 | |
ef0c2bb0 | 867 | if (is_overlap_unlock(lkb) && (mstype == DLM_MSG_UNLOCK_REPLY)) { |
43279e53 | 868 | log_debug(ls, "remwait %x unlock_reply overlap", lkb->lkb_id); |
ef0c2bb0 DT |
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)) { | |
43279e53 | 875 | log_debug(ls, "remwait %x cancel_reply overlap", lkb->lkb_id); |
ef0c2bb0 DT |
876 | lkb->lkb_flags &= ~DLM_IFL_OVERLAP_CANCEL; |
877 | overlap_done = 1; | |
878 | goto out_del; | |
879 | } | |
880 | ||
43279e53 DT |
881 | /* Cancel state was preemptively cleared by a successful convert, |
882 | see next comment, nothing to do. */ | |
883 | ||
884 | if ((mstype == DLM_MSG_CANCEL_REPLY) && | |
885 | (lkb->lkb_wait_type != DLM_MSG_CANCEL)) { | |
886 | log_debug(ls, "remwait %x cancel_reply wait_type %d", | |
887 | lkb->lkb_id, lkb->lkb_wait_type); | |
888 | return -1; | |
889 | } | |
890 | ||
891 | /* Remove for the convert reply, and premptively remove for the | |
892 | cancel reply. A convert has been granted while there's still | |
893 | an outstanding cancel on it (the cancel is moot and the result | |
894 | in the cancel reply should be 0). We preempt the cancel reply | |
895 | because the app gets the convert result and then can follow up | |
896 | with another op, like convert. This subsequent op would see the | |
897 | lingering state of the cancel and fail with -EBUSY. */ | |
898 | ||
899 | if ((mstype == DLM_MSG_CONVERT_REPLY) && | |
900 | (lkb->lkb_wait_type == DLM_MSG_CONVERT) && | |
901 | is_overlap_cancel(lkb) && ms && !ms->m_result) { | |
902 | log_debug(ls, "remwait %x convert_reply zap overlap_cancel", | |
903 | lkb->lkb_id); | |
904 | lkb->lkb_wait_type = 0; | |
905 | lkb->lkb_flags &= ~DLM_IFL_OVERLAP_CANCEL; | |
906 | lkb->lkb_wait_count--; | |
907 | goto out_del; | |
908 | } | |
909 | ||
ef0c2bb0 DT |
910 | /* N.B. type of reply may not always correspond to type of original |
911 | msg due to lookup->request optimization, verify others? */ | |
912 | ||
913 | if (lkb->lkb_wait_type) { | |
914 | lkb->lkb_wait_type = 0; | |
915 | goto out_del; | |
916 | } | |
917 | ||
43279e53 DT |
918 | log_error(ls, "remwait error %x reply %d flags %x no wait_type", |
919 | lkb->lkb_id, mstype, lkb->lkb_flags); | |
ef0c2bb0 DT |
920 | return -1; |
921 | ||
922 | out_del: | |
923 | /* the force-unlock/cancel has completed and we haven't recvd a reply | |
924 | to the op that was in progress prior to the unlock/cancel; we | |
925 | give up on any reply to the earlier op. FIXME: not sure when/how | |
926 | this would happen */ | |
927 | ||
928 | if (overlap_done && lkb->lkb_wait_type) { | |
43279e53 | 929 | log_error(ls, "remwait error %x reply %d wait_type %d overlap", |
ef0c2bb0 DT |
930 | lkb->lkb_id, mstype, lkb->lkb_wait_type); |
931 | lkb->lkb_wait_count--; | |
932 | lkb->lkb_wait_type = 0; | |
933 | } | |
934 | ||
935 | DLM_ASSERT(lkb->lkb_wait_count, dlm_print_lkb(lkb);); | |
936 | ||
b790c3b7 | 937 | lkb->lkb_flags &= ~DLM_IFL_RESEND; |
ef0c2bb0 DT |
938 | lkb->lkb_wait_count--; |
939 | if (!lkb->lkb_wait_count) | |
940 | list_del_init(&lkb->lkb_wait_reply); | |
e7fd4179 | 941 | unhold_lkb(lkb); |
ef0c2bb0 | 942 | return 0; |
e7fd4179 DT |
943 | } |
944 | ||
ef0c2bb0 | 945 | static int remove_from_waiters(struct dlm_lkb *lkb, int mstype) |
e7fd4179 DT |
946 | { |
947 | struct dlm_ls *ls = lkb->lkb_resource->res_ls; | |
948 | int error; | |
949 | ||
90135925 | 950 | mutex_lock(&ls->ls_waiters_mutex); |
43279e53 | 951 | error = _remove_from_waiters(lkb, mstype, NULL); |
90135925 | 952 | mutex_unlock(&ls->ls_waiters_mutex); |
e7fd4179 DT |
953 | return error; |
954 | } | |
955 | ||
ef0c2bb0 DT |
956 | /* Handles situations where we might be processing a "fake" or "stub" reply in |
957 | which we can't try to take waiters_mutex again. */ | |
958 | ||
959 | static int remove_from_waiters_ms(struct dlm_lkb *lkb, struct dlm_message *ms) | |
960 | { | |
961 | struct dlm_ls *ls = lkb->lkb_resource->res_ls; | |
962 | int error; | |
963 | ||
964 | if (ms != &ls->ls_stub_ms) | |
965 | mutex_lock(&ls->ls_waiters_mutex); | |
43279e53 | 966 | error = _remove_from_waiters(lkb, ms->m_type, ms); |
ef0c2bb0 DT |
967 | if (ms != &ls->ls_stub_ms) |
968 | mutex_unlock(&ls->ls_waiters_mutex); | |
969 | return error; | |
970 | } | |
971 | ||
e7fd4179 DT |
972 | static void dir_remove(struct dlm_rsb *r) |
973 | { | |
974 | int to_nodeid; | |
975 | ||
976 | if (dlm_no_directory(r->res_ls)) | |
977 | return; | |
978 | ||
979 | to_nodeid = dlm_dir_nodeid(r); | |
980 | if (to_nodeid != dlm_our_nodeid()) | |
981 | send_remove(r); | |
982 | else | |
983 | dlm_dir_remove_entry(r->res_ls, to_nodeid, | |
984 | r->res_name, r->res_length); | |
985 | } | |
986 | ||
987 | /* FIXME: shouldn't this be able to exit as soon as one non-due rsb is | |
988 | found since they are in order of newest to oldest? */ | |
989 | ||
990 | static int shrink_bucket(struct dlm_ls *ls, int b) | |
991 | { | |
992 | struct dlm_rsb *r; | |
993 | int count = 0, found; | |
994 | ||
995 | for (;;) { | |
90135925 | 996 | found = 0; |
c7be761a | 997 | spin_lock(&ls->ls_rsbtbl[b].lock); |
e7fd4179 DT |
998 | list_for_each_entry_reverse(r, &ls->ls_rsbtbl[b].toss, |
999 | res_hashchain) { | |
1000 | if (!time_after_eq(jiffies, r->res_toss_time + | |
68c817a1 | 1001 | dlm_config.ci_toss_secs * HZ)) |
e7fd4179 | 1002 | continue; |
90135925 | 1003 | found = 1; |
e7fd4179 DT |
1004 | break; |
1005 | } | |
1006 | ||
1007 | if (!found) { | |
c7be761a | 1008 | spin_unlock(&ls->ls_rsbtbl[b].lock); |
e7fd4179 DT |
1009 | break; |
1010 | } | |
1011 | ||
1012 | if (kref_put(&r->res_ref, kill_rsb)) { | |
1013 | list_del(&r->res_hashchain); | |
c7be761a | 1014 | spin_unlock(&ls->ls_rsbtbl[b].lock); |
e7fd4179 DT |
1015 | |
1016 | if (is_master(r)) | |
1017 | dir_remove(r); | |
52bda2b5 | 1018 | dlm_free_rsb(r); |
e7fd4179 DT |
1019 | count++; |
1020 | } else { | |
c7be761a | 1021 | spin_unlock(&ls->ls_rsbtbl[b].lock); |
e7fd4179 DT |
1022 | log_error(ls, "tossed rsb in use %s", r->res_name); |
1023 | } | |
1024 | } | |
1025 | ||
1026 | return count; | |
1027 | } | |
1028 | ||
1029 | void dlm_scan_rsbs(struct dlm_ls *ls) | |
1030 | { | |
1031 | int i; | |
1032 | ||
e7fd4179 DT |
1033 | for (i = 0; i < ls->ls_rsbtbl_size; i++) { |
1034 | shrink_bucket(ls, i); | |
85e86edf DT |
1035 | if (dlm_locking_stopped(ls)) |
1036 | break; | |
e7fd4179 DT |
1037 | cond_resched(); |
1038 | } | |
1039 | } | |
1040 | ||
3ae1acf9 DT |
1041 | static void add_timeout(struct dlm_lkb *lkb) |
1042 | { | |
1043 | struct dlm_ls *ls = lkb->lkb_resource->res_ls; | |
1044 | ||
eeda418d | 1045 | if (is_master_copy(lkb)) |
3ae1acf9 | 1046 | return; |
3ae1acf9 DT |
1047 | |
1048 | if (test_bit(LSFL_TIMEWARN, &ls->ls_flags) && | |
1049 | !(lkb->lkb_exflags & DLM_LKF_NODLCKWT)) { | |
1050 | lkb->lkb_flags |= DLM_IFL_WATCH_TIMEWARN; | |
1051 | goto add_it; | |
1052 | } | |
84d8cd69 DT |
1053 | if (lkb->lkb_exflags & DLM_LKF_TIMEOUT) |
1054 | goto add_it; | |
3ae1acf9 DT |
1055 | return; |
1056 | ||
1057 | add_it: | |
1058 | DLM_ASSERT(list_empty(&lkb->lkb_time_list), dlm_print_lkb(lkb);); | |
1059 | mutex_lock(&ls->ls_timeout_mutex); | |
1060 | hold_lkb(lkb); | |
3ae1acf9 DT |
1061 | list_add_tail(&lkb->lkb_time_list, &ls->ls_timeout); |
1062 | mutex_unlock(&ls->ls_timeout_mutex); | |
1063 | } | |
1064 | ||
1065 | static void del_timeout(struct dlm_lkb *lkb) | |
1066 | { | |
1067 | struct dlm_ls *ls = lkb->lkb_resource->res_ls; | |
1068 | ||
1069 | mutex_lock(&ls->ls_timeout_mutex); | |
1070 | if (!list_empty(&lkb->lkb_time_list)) { | |
1071 | list_del_init(&lkb->lkb_time_list); | |
1072 | unhold_lkb(lkb); | |
1073 | } | |
1074 | mutex_unlock(&ls->ls_timeout_mutex); | |
1075 | } | |
1076 | ||
1077 | /* FIXME: is it safe to look at lkb_exflags, lkb_flags, lkb_timestamp, and | |
1078 | lkb_lksb_timeout without lock_rsb? Note: we can't lock timeout_mutex | |
1079 | and then lock rsb because of lock ordering in add_timeout. We may need | |
1080 | to specify some special timeout-related bits in the lkb that are just to | |
1081 | be accessed under the timeout_mutex. */ | |
1082 | ||
1083 | void dlm_scan_timeout(struct dlm_ls *ls) | |
1084 | { | |
1085 | struct dlm_rsb *r; | |
1086 | struct dlm_lkb *lkb; | |
1087 | int do_cancel, do_warn; | |
eeda418d | 1088 | s64 wait_us; |
3ae1acf9 DT |
1089 | |
1090 | for (;;) { | |
1091 | if (dlm_locking_stopped(ls)) | |
1092 | break; | |
1093 | ||
1094 | do_cancel = 0; | |
1095 | do_warn = 0; | |
1096 | mutex_lock(&ls->ls_timeout_mutex); | |
1097 | list_for_each_entry(lkb, &ls->ls_timeout, lkb_time_list) { | |
1098 | ||
eeda418d DT |
1099 | wait_us = ktime_to_us(ktime_sub(ktime_get(), |
1100 | lkb->lkb_timestamp)); | |
1101 | ||
3ae1acf9 | 1102 | if ((lkb->lkb_exflags & DLM_LKF_TIMEOUT) && |
eeda418d | 1103 | wait_us >= (lkb->lkb_timeout_cs * 10000)) |
3ae1acf9 DT |
1104 | do_cancel = 1; |
1105 | ||
1106 | if ((lkb->lkb_flags & DLM_IFL_WATCH_TIMEWARN) && | |
eeda418d | 1107 | wait_us >= dlm_config.ci_timewarn_cs * 10000) |
3ae1acf9 DT |
1108 | do_warn = 1; |
1109 | ||
1110 | if (!do_cancel && !do_warn) | |
1111 | continue; | |
1112 | hold_lkb(lkb); | |
1113 | break; | |
1114 | } | |
1115 | mutex_unlock(&ls->ls_timeout_mutex); | |
1116 | ||
1117 | if (!do_cancel && !do_warn) | |
1118 | break; | |
1119 | ||
1120 | r = lkb->lkb_resource; | |
1121 | hold_rsb(r); | |
1122 | lock_rsb(r); | |
1123 | ||
1124 | if (do_warn) { | |
1125 | /* clear flag so we only warn once */ | |
1126 | lkb->lkb_flags &= ~DLM_IFL_WATCH_TIMEWARN; | |
1127 | if (!(lkb->lkb_exflags & DLM_LKF_TIMEOUT)) | |
1128 | del_timeout(lkb); | |
1129 | dlm_timeout_warn(lkb); | |
1130 | } | |
1131 | ||
1132 | if (do_cancel) { | |
b3cab7b9 | 1133 | log_debug(ls, "timeout cancel %x node %d %s", |
639aca41 | 1134 | lkb->lkb_id, lkb->lkb_nodeid, r->res_name); |
3ae1acf9 DT |
1135 | lkb->lkb_flags &= ~DLM_IFL_WATCH_TIMEWARN; |
1136 | lkb->lkb_flags |= DLM_IFL_TIMEOUT_CANCEL; | |
1137 | del_timeout(lkb); | |
1138 | _cancel_lock(r, lkb); | |
1139 | } | |
1140 | ||
1141 | unlock_rsb(r); | |
1142 | unhold_rsb(r); | |
1143 | dlm_put_lkb(lkb); | |
1144 | } | |
1145 | } | |
1146 | ||
1147 | /* This is only called by dlm_recoverd, and we rely on dlm_ls_stop() stopping | |
1148 | dlm_recoverd before checking/setting ls_recover_begin. */ | |
1149 | ||
1150 | void dlm_adjust_timeouts(struct dlm_ls *ls) | |
1151 | { | |
1152 | struct dlm_lkb *lkb; | |
eeda418d | 1153 | u64 adj_us = jiffies_to_usecs(jiffies - ls->ls_recover_begin); |
3ae1acf9 DT |
1154 | |
1155 | ls->ls_recover_begin = 0; | |
1156 | mutex_lock(&ls->ls_timeout_mutex); | |
1157 | list_for_each_entry(lkb, &ls->ls_timeout, lkb_time_list) | |
eeda418d | 1158 | lkb->lkb_timestamp = ktime_add_us(lkb->lkb_timestamp, adj_us); |
3ae1acf9 DT |
1159 | mutex_unlock(&ls->ls_timeout_mutex); |
1160 | } | |
1161 | ||
e7fd4179 DT |
1162 | /* lkb is master or local copy */ |
1163 | ||
1164 | static void set_lvb_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1165 | { | |
1166 | int b, len = r->res_ls->ls_lvblen; | |
1167 | ||
1168 | /* b=1 lvb returned to caller | |
1169 | b=0 lvb written to rsb or invalidated | |
1170 | b=-1 do nothing */ | |
1171 | ||
1172 | b = dlm_lvb_operations[lkb->lkb_grmode + 1][lkb->lkb_rqmode + 1]; | |
1173 | ||
1174 | if (b == 1) { | |
1175 | if (!lkb->lkb_lvbptr) | |
1176 | return; | |
1177 | ||
1178 | if (!(lkb->lkb_exflags & DLM_LKF_VALBLK)) | |
1179 | return; | |
1180 | ||
1181 | if (!r->res_lvbptr) | |
1182 | return; | |
1183 | ||
1184 | memcpy(lkb->lkb_lvbptr, r->res_lvbptr, len); | |
1185 | lkb->lkb_lvbseq = r->res_lvbseq; | |
1186 | ||
1187 | } else if (b == 0) { | |
1188 | if (lkb->lkb_exflags & DLM_LKF_IVVALBLK) { | |
1189 | rsb_set_flag(r, RSB_VALNOTVALID); | |
1190 | return; | |
1191 | } | |
1192 | ||
1193 | if (!lkb->lkb_lvbptr) | |
1194 | return; | |
1195 | ||
1196 | if (!(lkb->lkb_exflags & DLM_LKF_VALBLK)) | |
1197 | return; | |
1198 | ||
1199 | if (!r->res_lvbptr) | |
52bda2b5 | 1200 | r->res_lvbptr = dlm_allocate_lvb(r->res_ls); |
e7fd4179 DT |
1201 | |
1202 | if (!r->res_lvbptr) | |
1203 | return; | |
1204 | ||
1205 | memcpy(r->res_lvbptr, lkb->lkb_lvbptr, len); | |
1206 | r->res_lvbseq++; | |
1207 | lkb->lkb_lvbseq = r->res_lvbseq; | |
1208 | rsb_clear_flag(r, RSB_VALNOTVALID); | |
1209 | } | |
1210 | ||
1211 | if (rsb_flag(r, RSB_VALNOTVALID)) | |
1212 | lkb->lkb_sbflags |= DLM_SBF_VALNOTVALID; | |
1213 | } | |
1214 | ||
1215 | static void set_lvb_unlock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1216 | { | |
1217 | if (lkb->lkb_grmode < DLM_LOCK_PW) | |
1218 | return; | |
1219 | ||
1220 | if (lkb->lkb_exflags & DLM_LKF_IVVALBLK) { | |
1221 | rsb_set_flag(r, RSB_VALNOTVALID); | |
1222 | return; | |
1223 | } | |
1224 | ||
1225 | if (!lkb->lkb_lvbptr) | |
1226 | return; | |
1227 | ||
1228 | if (!(lkb->lkb_exflags & DLM_LKF_VALBLK)) | |
1229 | return; | |
1230 | ||
1231 | if (!r->res_lvbptr) | |
52bda2b5 | 1232 | r->res_lvbptr = dlm_allocate_lvb(r->res_ls); |
e7fd4179 DT |
1233 | |
1234 | if (!r->res_lvbptr) | |
1235 | return; | |
1236 | ||
1237 | memcpy(r->res_lvbptr, lkb->lkb_lvbptr, r->res_ls->ls_lvblen); | |
1238 | r->res_lvbseq++; | |
1239 | rsb_clear_flag(r, RSB_VALNOTVALID); | |
1240 | } | |
1241 | ||
1242 | /* lkb is process copy (pc) */ | |
1243 | ||
1244 | static void set_lvb_lock_pc(struct dlm_rsb *r, struct dlm_lkb *lkb, | |
1245 | struct dlm_message *ms) | |
1246 | { | |
1247 | int b; | |
1248 | ||
1249 | if (!lkb->lkb_lvbptr) | |
1250 | return; | |
1251 | ||
1252 | if (!(lkb->lkb_exflags & DLM_LKF_VALBLK)) | |
1253 | return; | |
1254 | ||
597d0cae | 1255 | b = dlm_lvb_operations[lkb->lkb_grmode + 1][lkb->lkb_rqmode + 1]; |
e7fd4179 DT |
1256 | if (b == 1) { |
1257 | int len = receive_extralen(ms); | |
a9cc9159 AV |
1258 | if (len > DLM_RESNAME_MAXLEN) |
1259 | len = DLM_RESNAME_MAXLEN; | |
e7fd4179 DT |
1260 | memcpy(lkb->lkb_lvbptr, ms->m_extra, len); |
1261 | lkb->lkb_lvbseq = ms->m_lvbseq; | |
1262 | } | |
1263 | } | |
1264 | ||
1265 | /* Manipulate lkb's on rsb's convert/granted/waiting queues | |
1266 | remove_lock -- used for unlock, removes lkb from granted | |
1267 | revert_lock -- used for cancel, moves lkb from convert to granted | |
1268 | grant_lock -- used for request and convert, adds lkb to granted or | |
1269 | moves lkb from convert or waiting to granted | |
1270 | ||
1271 | Each of these is used for master or local copy lkb's. There is | |
1272 | also a _pc() variation used to make the corresponding change on | |
1273 | a process copy (pc) lkb. */ | |
1274 | ||
1275 | static void _remove_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1276 | { | |
1277 | del_lkb(r, lkb); | |
1278 | lkb->lkb_grmode = DLM_LOCK_IV; | |
1279 | /* this unhold undoes the original ref from create_lkb() | |
1280 | so this leads to the lkb being freed */ | |
1281 | unhold_lkb(lkb); | |
1282 | } | |
1283 | ||
1284 | static void remove_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1285 | { | |
1286 | set_lvb_unlock(r, lkb); | |
1287 | _remove_lock(r, lkb); | |
1288 | } | |
1289 | ||
1290 | static void remove_lock_pc(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1291 | { | |
1292 | _remove_lock(r, lkb); | |
1293 | } | |
1294 | ||
ef0c2bb0 DT |
1295 | /* returns: 0 did nothing |
1296 | 1 moved lock to granted | |
1297 | -1 removed lock */ | |
1298 | ||
1299 | static int revert_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
e7fd4179 | 1300 | { |
ef0c2bb0 DT |
1301 | int rv = 0; |
1302 | ||
e7fd4179 DT |
1303 | lkb->lkb_rqmode = DLM_LOCK_IV; |
1304 | ||
1305 | switch (lkb->lkb_status) { | |
597d0cae DT |
1306 | case DLM_LKSTS_GRANTED: |
1307 | break; | |
e7fd4179 DT |
1308 | case DLM_LKSTS_CONVERT: |
1309 | move_lkb(r, lkb, DLM_LKSTS_GRANTED); | |
ef0c2bb0 | 1310 | rv = 1; |
e7fd4179 DT |
1311 | break; |
1312 | case DLM_LKSTS_WAITING: | |
1313 | del_lkb(r, lkb); | |
1314 | lkb->lkb_grmode = DLM_LOCK_IV; | |
1315 | /* this unhold undoes the original ref from create_lkb() | |
1316 | so this leads to the lkb being freed */ | |
1317 | unhold_lkb(lkb); | |
ef0c2bb0 | 1318 | rv = -1; |
e7fd4179 DT |
1319 | break; |
1320 | default: | |
1321 | log_print("invalid status for revert %d", lkb->lkb_status); | |
1322 | } | |
ef0c2bb0 | 1323 | return rv; |
e7fd4179 DT |
1324 | } |
1325 | ||
ef0c2bb0 | 1326 | static int revert_lock_pc(struct dlm_rsb *r, struct dlm_lkb *lkb) |
e7fd4179 | 1327 | { |
ef0c2bb0 | 1328 | return revert_lock(r, lkb); |
e7fd4179 DT |
1329 | } |
1330 | ||
1331 | static void _grant_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1332 | { | |
1333 | if (lkb->lkb_grmode != lkb->lkb_rqmode) { | |
1334 | lkb->lkb_grmode = lkb->lkb_rqmode; | |
1335 | if (lkb->lkb_status) | |
1336 | move_lkb(r, lkb, DLM_LKSTS_GRANTED); | |
1337 | else | |
1338 | add_lkb(r, lkb, DLM_LKSTS_GRANTED); | |
1339 | } | |
1340 | ||
1341 | lkb->lkb_rqmode = DLM_LOCK_IV; | |
e7fd4179 DT |
1342 | } |
1343 | ||
1344 | static void grant_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1345 | { | |
1346 | set_lvb_lock(r, lkb); | |
1347 | _grant_lock(r, lkb); | |
1348 | lkb->lkb_highbast = 0; | |
1349 | } | |
1350 | ||
1351 | static void grant_lock_pc(struct dlm_rsb *r, struct dlm_lkb *lkb, | |
1352 | struct dlm_message *ms) | |
1353 | { | |
1354 | set_lvb_lock_pc(r, lkb, ms); | |
1355 | _grant_lock(r, lkb); | |
1356 | } | |
1357 | ||
1358 | /* called by grant_pending_locks() which means an async grant message must | |
1359 | be sent to the requesting node in addition to granting the lock if the | |
1360 | lkb belongs to a remote node. */ | |
1361 | ||
1362 | static void grant_lock_pending(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1363 | { | |
1364 | grant_lock(r, lkb); | |
1365 | if (is_master_copy(lkb)) | |
1366 | send_grant(r, lkb); | |
1367 | else | |
1368 | queue_cast(r, lkb, 0); | |
1369 | } | |
1370 | ||
7d3c1feb DT |
1371 | /* The special CONVDEADLK, ALTPR and ALTCW flags allow the master to |
1372 | change the granted/requested modes. We're munging things accordingly in | |
1373 | the process copy. | |
1374 | CONVDEADLK: our grmode may have been forced down to NL to resolve a | |
1375 | conversion deadlock | |
1376 | ALTPR/ALTCW: our rqmode may have been changed to PR or CW to become | |
1377 | compatible with other granted locks */ | |
1378 | ||
1379 | static void munge_demoted(struct dlm_lkb *lkb, struct dlm_message *ms) | |
1380 | { | |
1381 | if (ms->m_type != DLM_MSG_CONVERT_REPLY) { | |
1382 | log_print("munge_demoted %x invalid reply type %d", | |
1383 | lkb->lkb_id, ms->m_type); | |
1384 | return; | |
1385 | } | |
1386 | ||
1387 | if (lkb->lkb_rqmode == DLM_LOCK_IV || lkb->lkb_grmode == DLM_LOCK_IV) { | |
1388 | log_print("munge_demoted %x invalid modes gr %d rq %d", | |
1389 | lkb->lkb_id, lkb->lkb_grmode, lkb->lkb_rqmode); | |
1390 | return; | |
1391 | } | |
1392 | ||
1393 | lkb->lkb_grmode = DLM_LOCK_NL; | |
1394 | } | |
1395 | ||
1396 | static void munge_altmode(struct dlm_lkb *lkb, struct dlm_message *ms) | |
1397 | { | |
1398 | if (ms->m_type != DLM_MSG_REQUEST_REPLY && | |
1399 | ms->m_type != DLM_MSG_GRANT) { | |
1400 | log_print("munge_altmode %x invalid reply type %d", | |
1401 | lkb->lkb_id, ms->m_type); | |
1402 | return; | |
1403 | } | |
1404 | ||
1405 | if (lkb->lkb_exflags & DLM_LKF_ALTPR) | |
1406 | lkb->lkb_rqmode = DLM_LOCK_PR; | |
1407 | else if (lkb->lkb_exflags & DLM_LKF_ALTCW) | |
1408 | lkb->lkb_rqmode = DLM_LOCK_CW; | |
1409 | else { | |
1410 | log_print("munge_altmode invalid exflags %x", lkb->lkb_exflags); | |
1411 | dlm_print_lkb(lkb); | |
1412 | } | |
1413 | } | |
1414 | ||
e7fd4179 DT |
1415 | static inline int first_in_list(struct dlm_lkb *lkb, struct list_head *head) |
1416 | { | |
1417 | struct dlm_lkb *first = list_entry(head->next, struct dlm_lkb, | |
1418 | lkb_statequeue); | |
1419 | if (lkb->lkb_id == first->lkb_id) | |
90135925 | 1420 | return 1; |
e7fd4179 | 1421 | |
90135925 | 1422 | return 0; |
e7fd4179 DT |
1423 | } |
1424 | ||
e7fd4179 DT |
1425 | /* Check if the given lkb conflicts with another lkb on the queue. */ |
1426 | ||
1427 | static int queue_conflict(struct list_head *head, struct dlm_lkb *lkb) | |
1428 | { | |
1429 | struct dlm_lkb *this; | |
1430 | ||
1431 | list_for_each_entry(this, head, lkb_statequeue) { | |
1432 | if (this == lkb) | |
1433 | continue; | |
3bcd3687 | 1434 | if (!modes_compat(this, lkb)) |
90135925 | 1435 | return 1; |
e7fd4179 | 1436 | } |
90135925 | 1437 | return 0; |
e7fd4179 DT |
1438 | } |
1439 | ||
1440 | /* | |
1441 | * "A conversion deadlock arises with a pair of lock requests in the converting | |
1442 | * queue for one resource. The granted mode of each lock blocks the requested | |
1443 | * mode of the other lock." | |
1444 | * | |
c85d65e9 DT |
1445 | * Part 2: if the granted mode of lkb is preventing an earlier lkb in the |
1446 | * convert queue from being granted, then deadlk/demote lkb. | |
e7fd4179 DT |
1447 | * |
1448 | * Example: | |
1449 | * Granted Queue: empty | |
1450 | * Convert Queue: NL->EX (first lock) | |
1451 | * PR->EX (second lock) | |
1452 | * | |
1453 | * The first lock can't be granted because of the granted mode of the second | |
1454 | * lock and the second lock can't be granted because it's not first in the | |
c85d65e9 DT |
1455 | * list. We either cancel lkb's conversion (PR->EX) and return EDEADLK, or we |
1456 | * demote the granted mode of lkb (from PR to NL) if it has the CONVDEADLK | |
1457 | * flag set and return DEMOTED in the lksb flags. | |
e7fd4179 | 1458 | * |
c85d65e9 DT |
1459 | * Originally, this function detected conv-deadlk in a more limited scope: |
1460 | * - if !modes_compat(lkb1, lkb2) && !modes_compat(lkb2, lkb1), or | |
1461 | * - if lkb1 was the first entry in the queue (not just earlier), and was | |
1462 | * blocked by the granted mode of lkb2, and there was nothing on the | |
1463 | * granted queue preventing lkb1 from being granted immediately, i.e. | |
1464 | * lkb2 was the only thing preventing lkb1 from being granted. | |
1465 | * | |
1466 | * That second condition meant we'd only say there was conv-deadlk if | |
1467 | * resolving it (by demotion) would lead to the first lock on the convert | |
1468 | * queue being granted right away. It allowed conversion deadlocks to exist | |
1469 | * between locks on the convert queue while they couldn't be granted anyway. | |
1470 | * | |
1471 | * Now, we detect and take action on conversion deadlocks immediately when | |
1472 | * they're created, even if they may not be immediately consequential. If | |
1473 | * lkb1 exists anywhere in the convert queue and lkb2 comes in with a granted | |
1474 | * mode that would prevent lkb1's conversion from being granted, we do a | |
1475 | * deadlk/demote on lkb2 right away and don't let it onto the convert queue. | |
1476 | * I think this means that the lkb_is_ahead condition below should always | |
1477 | * be zero, i.e. there will never be conv-deadlk between two locks that are | |
1478 | * both already on the convert queue. | |
e7fd4179 DT |
1479 | */ |
1480 | ||
c85d65e9 | 1481 | static int conversion_deadlock_detect(struct dlm_rsb *r, struct dlm_lkb *lkb2) |
e7fd4179 | 1482 | { |
c85d65e9 DT |
1483 | struct dlm_lkb *lkb1; |
1484 | int lkb_is_ahead = 0; | |
e7fd4179 | 1485 | |
c85d65e9 DT |
1486 | list_for_each_entry(lkb1, &r->res_convertqueue, lkb_statequeue) { |
1487 | if (lkb1 == lkb2) { | |
1488 | lkb_is_ahead = 1; | |
e7fd4179 DT |
1489 | continue; |
1490 | } | |
1491 | ||
c85d65e9 DT |
1492 | if (!lkb_is_ahead) { |
1493 | if (!modes_compat(lkb2, lkb1)) | |
1494 | return 1; | |
1495 | } else { | |
1496 | if (!modes_compat(lkb2, lkb1) && | |
1497 | !modes_compat(lkb1, lkb2)) | |
1498 | return 1; | |
1499 | } | |
e7fd4179 | 1500 | } |
90135925 | 1501 | return 0; |
e7fd4179 DT |
1502 | } |
1503 | ||
1504 | /* | |
1505 | * Return 1 if the lock can be granted, 0 otherwise. | |
1506 | * Also detect and resolve conversion deadlocks. | |
1507 | * | |
1508 | * lkb is the lock to be granted | |
1509 | * | |
1510 | * now is 1 if the function is being called in the context of the | |
1511 | * immediate request, it is 0 if called later, after the lock has been | |
1512 | * queued. | |
1513 | * | |
1514 | * References are from chapter 6 of "VAXcluster Principles" by Roy Davis | |
1515 | */ | |
1516 | ||
1517 | static int _can_be_granted(struct dlm_rsb *r, struct dlm_lkb *lkb, int now) | |
1518 | { | |
1519 | int8_t conv = (lkb->lkb_grmode != DLM_LOCK_IV); | |
1520 | ||
1521 | /* | |
1522 | * 6-10: Version 5.4 introduced an option to address the phenomenon of | |
1523 | * a new request for a NL mode lock being blocked. | |
1524 | * | |
1525 | * 6-11: If the optional EXPEDITE flag is used with the new NL mode | |
1526 | * request, then it would be granted. In essence, the use of this flag | |
1527 | * tells the Lock Manager to expedite theis request by not considering | |
1528 | * what may be in the CONVERTING or WAITING queues... As of this | |
1529 | * writing, the EXPEDITE flag can be used only with new requests for NL | |
1530 | * mode locks. This flag is not valid for conversion requests. | |
1531 | * | |
1532 | * A shortcut. Earlier checks return an error if EXPEDITE is used in a | |
1533 | * conversion or used with a non-NL requested mode. We also know an | |
1534 | * EXPEDITE request is always granted immediately, so now must always | |
1535 | * be 1. The full condition to grant an expedite request: (now && | |
1536 | * !conv && lkb->rqmode == DLM_LOCK_NL && (flags & EXPEDITE)) can | |
1537 | * therefore be shortened to just checking the flag. | |
1538 | */ | |
1539 | ||
1540 | if (lkb->lkb_exflags & DLM_LKF_EXPEDITE) | |
90135925 | 1541 | return 1; |
e7fd4179 DT |
1542 | |
1543 | /* | |
1544 | * A shortcut. Without this, !queue_conflict(grantqueue, lkb) would be | |
1545 | * added to the remaining conditions. | |
1546 | */ | |
1547 | ||
1548 | if (queue_conflict(&r->res_grantqueue, lkb)) | |
1549 | goto out; | |
1550 | ||
1551 | /* | |
1552 | * 6-3: By default, a conversion request is immediately granted if the | |
1553 | * requested mode is compatible with the modes of all other granted | |
1554 | * locks | |
1555 | */ | |
1556 | ||
1557 | if (queue_conflict(&r->res_convertqueue, lkb)) | |
1558 | goto out; | |
1559 | ||
1560 | /* | |
1561 | * 6-5: But the default algorithm for deciding whether to grant or | |
1562 | * queue conversion requests does not by itself guarantee that such | |
1563 | * requests are serviced on a "first come first serve" basis. This, in | |
1564 | * turn, can lead to a phenomenon known as "indefinate postponement". | |
1565 | * | |
1566 | * 6-7: This issue is dealt with by using the optional QUECVT flag with | |
1567 | * the system service employed to request a lock conversion. This flag | |
1568 | * forces certain conversion requests to be queued, even if they are | |
1569 | * compatible with the granted modes of other locks on the same | |
1570 | * resource. Thus, the use of this flag results in conversion requests | |
1571 | * being ordered on a "first come first servce" basis. | |
1572 | * | |
1573 | * DCT: This condition is all about new conversions being able to occur | |
1574 | * "in place" while the lock remains on the granted queue (assuming | |
1575 | * nothing else conflicts.) IOW if QUECVT isn't set, a conversion | |
1576 | * doesn't _have_ to go onto the convert queue where it's processed in | |
1577 | * order. The "now" variable is necessary to distinguish converts | |
1578 | * being received and processed for the first time now, because once a | |
1579 | * convert is moved to the conversion queue the condition below applies | |
1580 | * requiring fifo granting. | |
1581 | */ | |
1582 | ||
1583 | if (now && conv && !(lkb->lkb_exflags & DLM_LKF_QUECVT)) | |
90135925 | 1584 | return 1; |
e7fd4179 DT |
1585 | |
1586 | /* | |
3bcd3687 DT |
1587 | * The NOORDER flag is set to avoid the standard vms rules on grant |
1588 | * order. | |
e7fd4179 DT |
1589 | */ |
1590 | ||
1591 | if (lkb->lkb_exflags & DLM_LKF_NOORDER) | |
90135925 | 1592 | return 1; |
e7fd4179 DT |
1593 | |
1594 | /* | |
1595 | * 6-3: Once in that queue [CONVERTING], a conversion request cannot be | |
1596 | * granted until all other conversion requests ahead of it are granted | |
1597 | * and/or canceled. | |
1598 | */ | |
1599 | ||
1600 | if (!now && conv && first_in_list(lkb, &r->res_convertqueue)) | |
90135925 | 1601 | return 1; |
e7fd4179 DT |
1602 | |
1603 | /* | |
1604 | * 6-4: By default, a new request is immediately granted only if all | |
1605 | * three of the following conditions are satisfied when the request is | |
1606 | * issued: | |
1607 | * - The queue of ungranted conversion requests for the resource is | |
1608 | * empty. | |
1609 | * - The queue of ungranted new requests for the resource is empty. | |
1610 | * - The mode of the new request is compatible with the most | |
1611 | * restrictive mode of all granted locks on the resource. | |
1612 | */ | |
1613 | ||
1614 | if (now && !conv && list_empty(&r->res_convertqueue) && | |
1615 | list_empty(&r->res_waitqueue)) | |
90135925 | 1616 | return 1; |
e7fd4179 DT |
1617 | |
1618 | /* | |
1619 | * 6-4: Once a lock request is in the queue of ungranted new requests, | |
1620 | * it cannot be granted until the queue of ungranted conversion | |
1621 | * requests is empty, all ungranted new requests ahead of it are | |
1622 | * granted and/or canceled, and it is compatible with the granted mode | |
1623 | * of the most restrictive lock granted on the resource. | |
1624 | */ | |
1625 | ||
1626 | if (!now && !conv && list_empty(&r->res_convertqueue) && | |
1627 | first_in_list(lkb, &r->res_waitqueue)) | |
90135925 | 1628 | return 1; |
e7fd4179 | 1629 | out: |
90135925 | 1630 | return 0; |
e7fd4179 DT |
1631 | } |
1632 | ||
c85d65e9 DT |
1633 | static int can_be_granted(struct dlm_rsb *r, struct dlm_lkb *lkb, int now, |
1634 | int *err) | |
e7fd4179 | 1635 | { |
e7fd4179 DT |
1636 | int rv; |
1637 | int8_t alt = 0, rqmode = lkb->lkb_rqmode; | |
c85d65e9 DT |
1638 | int8_t is_convert = (lkb->lkb_grmode != DLM_LOCK_IV); |
1639 | ||
1640 | if (err) | |
1641 | *err = 0; | |
e7fd4179 DT |
1642 | |
1643 | rv = _can_be_granted(r, lkb, now); | |
1644 | if (rv) | |
1645 | goto out; | |
1646 | ||
c85d65e9 DT |
1647 | /* |
1648 | * The CONVDEADLK flag is non-standard and tells the dlm to resolve | |
1649 | * conversion deadlocks by demoting grmode to NL, otherwise the dlm | |
1650 | * cancels one of the locks. | |
1651 | */ | |
1652 | ||
1653 | if (is_convert && can_be_queued(lkb) && | |
1654 | conversion_deadlock_detect(r, lkb)) { | |
1655 | if (lkb->lkb_exflags & DLM_LKF_CONVDEADLK) { | |
1656 | lkb->lkb_grmode = DLM_LOCK_NL; | |
1657 | lkb->lkb_sbflags |= DLM_SBF_DEMOTED; | |
1658 | } else if (!(lkb->lkb_exflags & DLM_LKF_NODLCKWT)) { | |
1659 | if (err) | |
1660 | *err = -EDEADLK; | |
1661 | else { | |
1662 | log_print("can_be_granted deadlock %x now %d", | |
1663 | lkb->lkb_id, now); | |
1664 | dlm_dump_rsb(r); | |
1665 | } | |
1666 | } | |
e7fd4179 | 1667 | goto out; |
c85d65e9 | 1668 | } |
e7fd4179 | 1669 | |
c85d65e9 DT |
1670 | /* |
1671 | * The ALTPR and ALTCW flags are non-standard and tell the dlm to try | |
1672 | * to grant a request in a mode other than the normal rqmode. It's a | |
1673 | * simple way to provide a big optimization to applications that can | |
1674 | * use them. | |
1675 | */ | |
1676 | ||
1677 | if (rqmode != DLM_LOCK_PR && (lkb->lkb_exflags & DLM_LKF_ALTPR)) | |
e7fd4179 | 1678 | alt = DLM_LOCK_PR; |
c85d65e9 | 1679 | else if (rqmode != DLM_LOCK_CW && (lkb->lkb_exflags & DLM_LKF_ALTCW)) |
e7fd4179 DT |
1680 | alt = DLM_LOCK_CW; |
1681 | ||
1682 | if (alt) { | |
1683 | lkb->lkb_rqmode = alt; | |
1684 | rv = _can_be_granted(r, lkb, now); | |
1685 | if (rv) | |
1686 | lkb->lkb_sbflags |= DLM_SBF_ALTMODE; | |
1687 | else | |
1688 | lkb->lkb_rqmode = rqmode; | |
1689 | } | |
1690 | out: | |
1691 | return rv; | |
1692 | } | |
1693 | ||
c85d65e9 DT |
1694 | /* FIXME: I don't think that can_be_granted() can/will demote or find deadlock |
1695 | for locks pending on the convert list. Once verified (watch for these | |
1696 | log_prints), we should be able to just call _can_be_granted() and not | |
1697 | bother with the demote/deadlk cases here (and there's no easy way to deal | |
1698 | with a deadlk here, we'd have to generate something like grant_lock with | |
1699 | the deadlk error.) */ | |
1700 | ||
36509258 DT |
1701 | /* Returns the highest requested mode of all blocked conversions; sets |
1702 | cw if there's a blocked conversion to DLM_LOCK_CW. */ | |
c85d65e9 | 1703 | |
36509258 | 1704 | static int grant_pending_convert(struct dlm_rsb *r, int high, int *cw) |
e7fd4179 DT |
1705 | { |
1706 | struct dlm_lkb *lkb, *s; | |
1707 | int hi, demoted, quit, grant_restart, demote_restart; | |
c85d65e9 | 1708 | int deadlk; |
e7fd4179 DT |
1709 | |
1710 | quit = 0; | |
1711 | restart: | |
1712 | grant_restart = 0; | |
1713 | demote_restart = 0; | |
1714 | hi = DLM_LOCK_IV; | |
1715 | ||
1716 | list_for_each_entry_safe(lkb, s, &r->res_convertqueue, lkb_statequeue) { | |
1717 | demoted = is_demoted(lkb); | |
c85d65e9 DT |
1718 | deadlk = 0; |
1719 | ||
1720 | if (can_be_granted(r, lkb, 0, &deadlk)) { | |
e7fd4179 DT |
1721 | grant_lock_pending(r, lkb); |
1722 | grant_restart = 1; | |
c85d65e9 | 1723 | continue; |
e7fd4179 | 1724 | } |
c85d65e9 DT |
1725 | |
1726 | if (!demoted && is_demoted(lkb)) { | |
1727 | log_print("WARN: pending demoted %x node %d %s", | |
1728 | lkb->lkb_id, lkb->lkb_nodeid, r->res_name); | |
1729 | demote_restart = 1; | |
1730 | continue; | |
1731 | } | |
1732 | ||
1733 | if (deadlk) { | |
1734 | log_print("WARN: pending deadlock %x node %d %s", | |
1735 | lkb->lkb_id, lkb->lkb_nodeid, r->res_name); | |
1736 | dlm_dump_rsb(r); | |
1737 | continue; | |
1738 | } | |
1739 | ||
1740 | hi = max_t(int, lkb->lkb_rqmode, hi); | |
36509258 DT |
1741 | |
1742 | if (cw && lkb->lkb_rqmode == DLM_LOCK_CW) | |
1743 | *cw = 1; | |
e7fd4179 DT |
1744 | } |
1745 | ||
1746 | if (grant_restart) | |
1747 | goto restart; | |
1748 | if (demote_restart && !quit) { | |
1749 | quit = 1; | |
1750 | goto restart; | |
1751 | } | |
1752 | ||
1753 | return max_t(int, high, hi); | |
1754 | } | |
1755 | ||
36509258 | 1756 | static int grant_pending_wait(struct dlm_rsb *r, int high, int *cw) |
e7fd4179 DT |
1757 | { |
1758 | struct dlm_lkb *lkb, *s; | |
1759 | ||
1760 | list_for_each_entry_safe(lkb, s, &r->res_waitqueue, lkb_statequeue) { | |
c85d65e9 | 1761 | if (can_be_granted(r, lkb, 0, NULL)) |
e7fd4179 | 1762 | grant_lock_pending(r, lkb); |
36509258 | 1763 | else { |
e7fd4179 | 1764 | high = max_t(int, lkb->lkb_rqmode, high); |
36509258 DT |
1765 | if (lkb->lkb_rqmode == DLM_LOCK_CW) |
1766 | *cw = 1; | |
1767 | } | |
e7fd4179 DT |
1768 | } |
1769 | ||
1770 | return high; | |
1771 | } | |
1772 | ||
36509258 DT |
1773 | /* cw of 1 means there's a lock with a rqmode of DLM_LOCK_CW that's blocked |
1774 | on either the convert or waiting queue. | |
1775 | high is the largest rqmode of all locks blocked on the convert or | |
1776 | waiting queue. */ | |
1777 | ||
1778 | static int lock_requires_bast(struct dlm_lkb *gr, int high, int cw) | |
1779 | { | |
1780 | if (gr->lkb_grmode == DLM_LOCK_PR && cw) { | |
1781 | if (gr->lkb_highbast < DLM_LOCK_EX) | |
1782 | return 1; | |
1783 | return 0; | |
1784 | } | |
1785 | ||
1786 | if (gr->lkb_highbast < high && | |
1787 | !__dlm_compat_matrix[gr->lkb_grmode+1][high+1]) | |
1788 | return 1; | |
1789 | return 0; | |
1790 | } | |
1791 | ||
e7fd4179 DT |
1792 | static void grant_pending_locks(struct dlm_rsb *r) |
1793 | { | |
1794 | struct dlm_lkb *lkb, *s; | |
1795 | int high = DLM_LOCK_IV; | |
36509258 | 1796 | int cw = 0; |
e7fd4179 | 1797 | |
a345da3e | 1798 | DLM_ASSERT(is_master(r), dlm_dump_rsb(r);); |
e7fd4179 | 1799 | |
36509258 DT |
1800 | high = grant_pending_convert(r, high, &cw); |
1801 | high = grant_pending_wait(r, high, &cw); | |
e7fd4179 DT |
1802 | |
1803 | if (high == DLM_LOCK_IV) | |
1804 | return; | |
1805 | ||
1806 | /* | |
1807 | * If there are locks left on the wait/convert queue then send blocking | |
1808 | * ASTs to granted locks based on the largest requested mode (high) | |
36509258 | 1809 | * found above. |
e7fd4179 DT |
1810 | */ |
1811 | ||
1812 | list_for_each_entry_safe(lkb, s, &r->res_grantqueue, lkb_statequeue) { | |
e5dae548 | 1813 | if (lkb->lkb_bastfn && lock_requires_bast(lkb, high, cw)) { |
329fc4c3 DT |
1814 | if (cw && high == DLM_LOCK_PR && |
1815 | lkb->lkb_grmode == DLM_LOCK_PR) | |
36509258 DT |
1816 | queue_bast(r, lkb, DLM_LOCK_CW); |
1817 | else | |
1818 | queue_bast(r, lkb, high); | |
e7fd4179 DT |
1819 | lkb->lkb_highbast = high; |
1820 | } | |
1821 | } | |
1822 | } | |
1823 | ||
36509258 DT |
1824 | static int modes_require_bast(struct dlm_lkb *gr, struct dlm_lkb *rq) |
1825 | { | |
1826 | if ((gr->lkb_grmode == DLM_LOCK_PR && rq->lkb_rqmode == DLM_LOCK_CW) || | |
1827 | (gr->lkb_grmode == DLM_LOCK_CW && rq->lkb_rqmode == DLM_LOCK_PR)) { | |
1828 | if (gr->lkb_highbast < DLM_LOCK_EX) | |
1829 | return 1; | |
1830 | return 0; | |
1831 | } | |
1832 | ||
1833 | if (gr->lkb_highbast < rq->lkb_rqmode && !modes_compat(gr, rq)) | |
1834 | return 1; | |
1835 | return 0; | |
1836 | } | |
1837 | ||
e7fd4179 DT |
1838 | static void send_bast_queue(struct dlm_rsb *r, struct list_head *head, |
1839 | struct dlm_lkb *lkb) | |
1840 | { | |
1841 | struct dlm_lkb *gr; | |
1842 | ||
1843 | list_for_each_entry(gr, head, lkb_statequeue) { | |
314dd2a0 SW |
1844 | /* skip self when sending basts to convertqueue */ |
1845 | if (gr == lkb) | |
1846 | continue; | |
e5dae548 | 1847 | if (gr->lkb_bastfn && modes_require_bast(gr, lkb)) { |
e7fd4179 DT |
1848 | queue_bast(r, gr, lkb->lkb_rqmode); |
1849 | gr->lkb_highbast = lkb->lkb_rqmode; | |
1850 | } | |
1851 | } | |
1852 | } | |
1853 | ||
1854 | static void send_blocking_asts(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1855 | { | |
1856 | send_bast_queue(r, &r->res_grantqueue, lkb); | |
1857 | } | |
1858 | ||
1859 | static void send_blocking_asts_all(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1860 | { | |
1861 | send_bast_queue(r, &r->res_grantqueue, lkb); | |
1862 | send_bast_queue(r, &r->res_convertqueue, lkb); | |
1863 | } | |
1864 | ||
1865 | /* set_master(r, lkb) -- set the master nodeid of a resource | |
1866 | ||
1867 | The purpose of this function is to set the nodeid field in the given | |
1868 | lkb using the nodeid field in the given rsb. If the rsb's nodeid is | |
1869 | known, it can just be copied to the lkb and the function will return | |
1870 | 0. If the rsb's nodeid is _not_ known, it needs to be looked up | |
1871 | before it can be copied to the lkb. | |
1872 | ||
1873 | When the rsb nodeid is being looked up remotely, the initial lkb | |
1874 | causing the lookup is kept on the ls_waiters list waiting for the | |
1875 | lookup reply. Other lkb's waiting for the same rsb lookup are kept | |
1876 | on the rsb's res_lookup list until the master is verified. | |
1877 | ||
1878 | Return values: | |
1879 | 0: nodeid is set in rsb/lkb and the caller should go ahead and use it | |
1880 | 1: the rsb master is not available and the lkb has been placed on | |
1881 | a wait queue | |
1882 | */ | |
1883 | ||
1884 | static int set_master(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1885 | { | |
1886 | struct dlm_ls *ls = r->res_ls; | |
755b5eb8 | 1887 | int i, error, dir_nodeid, ret_nodeid, our_nodeid = dlm_our_nodeid(); |
e7fd4179 DT |
1888 | |
1889 | if (rsb_flag(r, RSB_MASTER_UNCERTAIN)) { | |
1890 | rsb_clear_flag(r, RSB_MASTER_UNCERTAIN); | |
1891 | r->res_first_lkid = lkb->lkb_id; | |
1892 | lkb->lkb_nodeid = r->res_nodeid; | |
1893 | return 0; | |
1894 | } | |
1895 | ||
1896 | if (r->res_first_lkid && r->res_first_lkid != lkb->lkb_id) { | |
1897 | list_add_tail(&lkb->lkb_rsb_lookup, &r->res_lookup); | |
1898 | return 1; | |
1899 | } | |
1900 | ||
1901 | if (r->res_nodeid == 0) { | |
1902 | lkb->lkb_nodeid = 0; | |
1903 | return 0; | |
1904 | } | |
1905 | ||
1906 | if (r->res_nodeid > 0) { | |
1907 | lkb->lkb_nodeid = r->res_nodeid; | |
1908 | return 0; | |
1909 | } | |
1910 | ||
a345da3e | 1911 | DLM_ASSERT(r->res_nodeid == -1, dlm_dump_rsb(r);); |
e7fd4179 DT |
1912 | |
1913 | dir_nodeid = dlm_dir_nodeid(r); | |
1914 | ||
1915 | if (dir_nodeid != our_nodeid) { | |
1916 | r->res_first_lkid = lkb->lkb_id; | |
1917 | send_lookup(r, lkb); | |
1918 | return 1; | |
1919 | } | |
1920 | ||
755b5eb8 | 1921 | for (i = 0; i < 2; i++) { |
e7fd4179 DT |
1922 | /* It's possible for dlm_scand to remove an old rsb for |
1923 | this same resource from the toss list, us to create | |
1924 | a new one, look up the master locally, and find it | |
1925 | already exists just before dlm_scand does the | |
1926 | dir_remove() on the previous rsb. */ | |
1927 | ||
1928 | error = dlm_dir_lookup(ls, our_nodeid, r->res_name, | |
1929 | r->res_length, &ret_nodeid); | |
1930 | if (!error) | |
1931 | break; | |
1932 | log_debug(ls, "dir_lookup error %d %s", error, r->res_name); | |
1933 | schedule(); | |
1934 | } | |
755b5eb8 DT |
1935 | if (error && error != -EEXIST) |
1936 | return error; | |
e7fd4179 DT |
1937 | |
1938 | if (ret_nodeid == our_nodeid) { | |
1939 | r->res_first_lkid = 0; | |
1940 | r->res_nodeid = 0; | |
1941 | lkb->lkb_nodeid = 0; | |
1942 | } else { | |
1943 | r->res_first_lkid = lkb->lkb_id; | |
1944 | r->res_nodeid = ret_nodeid; | |
1945 | lkb->lkb_nodeid = ret_nodeid; | |
1946 | } | |
1947 | return 0; | |
1948 | } | |
1949 | ||
1950 | static void process_lookup_list(struct dlm_rsb *r) | |
1951 | { | |
1952 | struct dlm_lkb *lkb, *safe; | |
1953 | ||
1954 | list_for_each_entry_safe(lkb, safe, &r->res_lookup, lkb_rsb_lookup) { | |
ef0c2bb0 | 1955 | list_del_init(&lkb->lkb_rsb_lookup); |
e7fd4179 DT |
1956 | _request_lock(r, lkb); |
1957 | schedule(); | |
1958 | } | |
1959 | } | |
1960 | ||
1961 | /* confirm_master -- confirm (or deny) an rsb's master nodeid */ | |
1962 | ||
1963 | static void confirm_master(struct dlm_rsb *r, int error) | |
1964 | { | |
1965 | struct dlm_lkb *lkb; | |
1966 | ||
1967 | if (!r->res_first_lkid) | |
1968 | return; | |
1969 | ||
1970 | switch (error) { | |
1971 | case 0: | |
1972 | case -EINPROGRESS: | |
1973 | r->res_first_lkid = 0; | |
1974 | process_lookup_list(r); | |
1975 | break; | |
1976 | ||
1977 | case -EAGAIN: | |
aec64e1b DT |
1978 | case -EBADR: |
1979 | case -ENOTBLK: | |
1980 | /* the remote request failed and won't be retried (it was | |
1981 | a NOQUEUE, or has been canceled/unlocked); make a waiting | |
1982 | lkb the first_lkid */ | |
e7fd4179 DT |
1983 | |
1984 | r->res_first_lkid = 0; | |
1985 | ||
1986 | if (!list_empty(&r->res_lookup)) { | |
1987 | lkb = list_entry(r->res_lookup.next, struct dlm_lkb, | |
1988 | lkb_rsb_lookup); | |
ef0c2bb0 | 1989 | list_del_init(&lkb->lkb_rsb_lookup); |
e7fd4179 DT |
1990 | r->res_first_lkid = lkb->lkb_id; |
1991 | _request_lock(r, lkb); | |
761b9d3f | 1992 | } |
e7fd4179 DT |
1993 | break; |
1994 | ||
1995 | default: | |
1996 | log_error(r->res_ls, "confirm_master unknown error %d", error); | |
1997 | } | |
1998 | } | |
1999 | ||
2000 | static int set_lock_args(int mode, struct dlm_lksb *lksb, uint32_t flags, | |
e5dae548 DT |
2001 | int namelen, unsigned long timeout_cs, |
2002 | void (*ast) (void *astparam), | |
2003 | void *astparam, | |
2004 | void (*bast) (void *astparam, int mode), | |
2005 | struct dlm_args *args) | |
e7fd4179 DT |
2006 | { |
2007 | int rv = -EINVAL; | |
2008 | ||
2009 | /* check for invalid arg usage */ | |
2010 | ||
2011 | if (mode < 0 || mode > DLM_LOCK_EX) | |
2012 | goto out; | |
2013 | ||
2014 | if (!(flags & DLM_LKF_CONVERT) && (namelen > DLM_RESNAME_MAXLEN)) | |
2015 | goto out; | |
2016 | ||
2017 | if (flags & DLM_LKF_CANCEL) | |
2018 | goto out; | |
2019 | ||
2020 | if (flags & DLM_LKF_QUECVT && !(flags & DLM_LKF_CONVERT)) | |
2021 | goto out; | |
2022 | ||
2023 | if (flags & DLM_LKF_CONVDEADLK && !(flags & DLM_LKF_CONVERT)) | |
2024 | goto out; | |
2025 | ||
2026 | if (flags & DLM_LKF_CONVDEADLK && flags & DLM_LKF_NOQUEUE) | |
2027 | goto out; | |
2028 | ||
2029 | if (flags & DLM_LKF_EXPEDITE && flags & DLM_LKF_CONVERT) | |
2030 | goto out; | |
2031 | ||
2032 | if (flags & DLM_LKF_EXPEDITE && flags & DLM_LKF_QUECVT) | |
2033 | goto out; | |
2034 | ||
2035 | if (flags & DLM_LKF_EXPEDITE && flags & DLM_LKF_NOQUEUE) | |
2036 | goto out; | |
2037 | ||
2038 | if (flags & DLM_LKF_EXPEDITE && mode != DLM_LOCK_NL) | |
2039 | goto out; | |
2040 | ||
2041 | if (!ast || !lksb) | |
2042 | goto out; | |
2043 | ||
2044 | if (flags & DLM_LKF_VALBLK && !lksb->sb_lvbptr) | |
2045 | goto out; | |
2046 | ||
e7fd4179 DT |
2047 | if (flags & DLM_LKF_CONVERT && !lksb->sb_lkid) |
2048 | goto out; | |
2049 | ||
2050 | /* these args will be copied to the lkb in validate_lock_args, | |
2051 | it cannot be done now because when converting locks, fields in | |
2052 | an active lkb cannot be modified before locking the rsb */ | |
2053 | ||
2054 | args->flags = flags; | |
e5dae548 DT |
2055 | args->astfn = ast; |
2056 | args->astparam = astparam; | |
2057 | args->bastfn = bast; | |
d7db923e | 2058 | args->timeout = timeout_cs; |
e7fd4179 DT |
2059 | args->mode = mode; |
2060 | args->lksb = lksb; | |
e7fd4179 DT |
2061 | rv = 0; |
2062 | out: | |
2063 | return rv; | |
2064 | } | |
2065 | ||
2066 | static int set_unlock_args(uint32_t flags, void *astarg, struct dlm_args *args) | |
2067 | { | |
2068 | if (flags & ~(DLM_LKF_CANCEL | DLM_LKF_VALBLK | DLM_LKF_IVVALBLK | | |
2069 | DLM_LKF_FORCEUNLOCK)) | |
2070 | return -EINVAL; | |
2071 | ||
ef0c2bb0 DT |
2072 | if (flags & DLM_LKF_CANCEL && flags & DLM_LKF_FORCEUNLOCK) |
2073 | return -EINVAL; | |
2074 | ||
e7fd4179 | 2075 | args->flags = flags; |
e5dae548 | 2076 | args->astparam = astarg; |
e7fd4179 DT |
2077 | return 0; |
2078 | } | |
2079 | ||
2080 | static int validate_lock_args(struct dlm_ls *ls, struct dlm_lkb *lkb, | |
2081 | struct dlm_args *args) | |
2082 | { | |
2083 | int rv = -EINVAL; | |
2084 | ||
2085 | if (args->flags & DLM_LKF_CONVERT) { | |
2086 | if (lkb->lkb_flags & DLM_IFL_MSTCPY) | |
2087 | goto out; | |
2088 | ||
2089 | if (args->flags & DLM_LKF_QUECVT && | |
2090 | !__quecvt_compat_matrix[lkb->lkb_grmode+1][args->mode+1]) | |
2091 | goto out; | |
2092 | ||
2093 | rv = -EBUSY; | |
2094 | if (lkb->lkb_status != DLM_LKSTS_GRANTED) | |
2095 | goto out; | |
2096 | ||
2097 | if (lkb->lkb_wait_type) | |
2098 | goto out; | |
ef0c2bb0 DT |
2099 | |
2100 | if (is_overlap(lkb)) | |
2101 | goto out; | |
e7fd4179 DT |
2102 | } |
2103 | ||
2104 | lkb->lkb_exflags = args->flags; | |
2105 | lkb->lkb_sbflags = 0; | |
e5dae548 | 2106 | lkb->lkb_astfn = args->astfn; |
e7fd4179 | 2107 | lkb->lkb_astparam = args->astparam; |
e5dae548 | 2108 | lkb->lkb_bastfn = args->bastfn; |
e7fd4179 DT |
2109 | lkb->lkb_rqmode = args->mode; |
2110 | lkb->lkb_lksb = args->lksb; | |
2111 | lkb->lkb_lvbptr = args->lksb->sb_lvbptr; | |
2112 | lkb->lkb_ownpid = (int) current->pid; | |
d7db923e | 2113 | lkb->lkb_timeout_cs = args->timeout; |
e7fd4179 DT |
2114 | rv = 0; |
2115 | out: | |
43279e53 DT |
2116 | if (rv) |
2117 | log_debug(ls, "validate_lock_args %d %x %x %x %d %d %s", | |
2118 | rv, lkb->lkb_id, lkb->lkb_flags, args->flags, | |
2119 | lkb->lkb_status, lkb->lkb_wait_type, | |
2120 | lkb->lkb_resource->res_name); | |
e7fd4179 DT |
2121 | return rv; |
2122 | } | |
2123 | ||
ef0c2bb0 DT |
2124 | /* when dlm_unlock() sees -EBUSY with CANCEL/FORCEUNLOCK it returns 0 |
2125 | for success */ | |
2126 | ||
2127 | /* note: it's valid for lkb_nodeid/res_nodeid to be -1 when we get here | |
2128 | because there may be a lookup in progress and it's valid to do | |
2129 | cancel/unlockf on it */ | |
2130 | ||
e7fd4179 DT |
2131 | static int validate_unlock_args(struct dlm_lkb *lkb, struct dlm_args *args) |
2132 | { | |
ef0c2bb0 | 2133 | struct dlm_ls *ls = lkb->lkb_resource->res_ls; |
e7fd4179 DT |
2134 | int rv = -EINVAL; |
2135 | ||
ef0c2bb0 DT |
2136 | if (lkb->lkb_flags & DLM_IFL_MSTCPY) { |
2137 | log_error(ls, "unlock on MSTCPY %x", lkb->lkb_id); | |
2138 | dlm_print_lkb(lkb); | |
e7fd4179 | 2139 | goto out; |
ef0c2bb0 | 2140 | } |
e7fd4179 | 2141 | |
ef0c2bb0 DT |
2142 | /* an lkb may still exist even though the lock is EOL'ed due to a |
2143 | cancel, unlock or failed noqueue request; an app can't use these | |
2144 | locks; return same error as if the lkid had not been found at all */ | |
e7fd4179 | 2145 | |
ef0c2bb0 DT |
2146 | if (lkb->lkb_flags & DLM_IFL_ENDOFLIFE) { |
2147 | log_debug(ls, "unlock on ENDOFLIFE %x", lkb->lkb_id); | |
2148 | rv = -ENOENT; | |
e7fd4179 | 2149 | goto out; |
ef0c2bb0 | 2150 | } |
e7fd4179 | 2151 | |
ef0c2bb0 DT |
2152 | /* an lkb may be waiting for an rsb lookup to complete where the |
2153 | lookup was initiated by another lock */ | |
2154 | ||
42dc1601 DT |
2155 | if (!list_empty(&lkb->lkb_rsb_lookup)) { |
2156 | if (args->flags & (DLM_LKF_CANCEL | DLM_LKF_FORCEUNLOCK)) { | |
ef0c2bb0 DT |
2157 | log_debug(ls, "unlock on rsb_lookup %x", lkb->lkb_id); |
2158 | list_del_init(&lkb->lkb_rsb_lookup); | |
2159 | queue_cast(lkb->lkb_resource, lkb, | |
2160 | args->flags & DLM_LKF_CANCEL ? | |
2161 | -DLM_ECANCEL : -DLM_EUNLOCK); | |
2162 | unhold_lkb(lkb); /* undoes create_lkb() */ | |
ef0c2bb0 | 2163 | } |
42dc1601 DT |
2164 | /* caller changes -EBUSY to 0 for CANCEL and FORCEUNLOCK */ |
2165 | rv = -EBUSY; | |
2166 | goto out; | |
ef0c2bb0 DT |
2167 | } |
2168 | ||
2169 | /* cancel not allowed with another cancel/unlock in progress */ | |
2170 | ||
2171 | if (args->flags & DLM_LKF_CANCEL) { | |
2172 | if (lkb->lkb_exflags & DLM_LKF_CANCEL) | |
2173 | goto out; | |
2174 | ||
2175 | if (is_overlap(lkb)) | |
2176 | goto out; | |
2177 | ||
3ae1acf9 DT |
2178 | /* don't let scand try to do a cancel */ |
2179 | del_timeout(lkb); | |
2180 | ||
ef0c2bb0 DT |
2181 | if (lkb->lkb_flags & DLM_IFL_RESEND) { |
2182 | lkb->lkb_flags |= DLM_IFL_OVERLAP_CANCEL; | |
2183 | rv = -EBUSY; | |
2184 | goto out; | |
2185 | } | |
2186 | ||
a536e381 DT |
2187 | /* there's nothing to cancel */ |
2188 | if (lkb->lkb_status == DLM_LKSTS_GRANTED && | |
2189 | !lkb->lkb_wait_type) { | |
2190 | rv = -EBUSY; | |
2191 | goto out; | |
2192 | } | |
2193 | ||
ef0c2bb0 DT |
2194 | switch (lkb->lkb_wait_type) { |
2195 | case DLM_MSG_LOOKUP: | |
2196 | case DLM_MSG_REQUEST: | |
2197 | lkb->lkb_flags |= DLM_IFL_OVERLAP_CANCEL; | |
2198 | rv = -EBUSY; | |
2199 | goto out; | |
2200 | case DLM_MSG_UNLOCK: | |
2201 | case DLM_MSG_CANCEL: | |
2202 | goto out; | |
2203 | } | |
2204 | /* add_to_waiters() will set OVERLAP_CANCEL */ | |
2205 | goto out_ok; | |
2206 | } | |
2207 | ||
2208 | /* do we need to allow a force-unlock if there's a normal unlock | |
2209 | already in progress? in what conditions could the normal unlock | |
2210 | fail such that we'd want to send a force-unlock to be sure? */ | |
2211 | ||
2212 | if (args->flags & DLM_LKF_FORCEUNLOCK) { | |
2213 | if (lkb->lkb_exflags & DLM_LKF_FORCEUNLOCK) | |
2214 | goto out; | |
2215 | ||
2216 | if (is_overlap_unlock(lkb)) | |
2217 | goto out; | |
e7fd4179 | 2218 | |
3ae1acf9 DT |
2219 | /* don't let scand try to do a cancel */ |
2220 | del_timeout(lkb); | |
2221 | ||
ef0c2bb0 DT |
2222 | if (lkb->lkb_flags & DLM_IFL_RESEND) { |
2223 | lkb->lkb_flags |= DLM_IFL_OVERLAP_UNLOCK; | |
2224 | rv = -EBUSY; | |
2225 | goto out; | |
2226 | } | |
2227 | ||
2228 | switch (lkb->lkb_wait_type) { | |
2229 | case DLM_MSG_LOOKUP: | |
2230 | case DLM_MSG_REQUEST: | |
2231 | lkb->lkb_flags |= DLM_IFL_OVERLAP_UNLOCK; | |
2232 | rv = -EBUSY; | |
2233 | goto out; | |
2234 | case DLM_MSG_UNLOCK: | |
2235 | goto out; | |
2236 | } | |
2237 | /* add_to_waiters() will set OVERLAP_UNLOCK */ | |
2238 | goto out_ok; | |
2239 | } | |
2240 | ||
2241 | /* normal unlock not allowed if there's any op in progress */ | |
e7fd4179 | 2242 | rv = -EBUSY; |
ef0c2bb0 | 2243 | if (lkb->lkb_wait_type || lkb->lkb_wait_count) |
e7fd4179 DT |
2244 | goto out; |
2245 | ||
2246 | out_ok: | |
ef0c2bb0 DT |
2247 | /* an overlapping op shouldn't blow away exflags from other op */ |
2248 | lkb->lkb_exflags |= args->flags; | |
e7fd4179 DT |
2249 | lkb->lkb_sbflags = 0; |
2250 | lkb->lkb_astparam = args->astparam; | |
e7fd4179 DT |
2251 | rv = 0; |
2252 | out: | |
ef0c2bb0 DT |
2253 | if (rv) |
2254 | log_debug(ls, "validate_unlock_args %d %x %x %x %x %d %s", rv, | |
2255 | lkb->lkb_id, lkb->lkb_flags, lkb->lkb_exflags, | |
2256 | args->flags, lkb->lkb_wait_type, | |
2257 | lkb->lkb_resource->res_name); | |
e7fd4179 DT |
2258 | return rv; |
2259 | } | |
2260 | ||
2261 | /* | |
2262 | * Four stage 4 varieties: | |
2263 | * do_request(), do_convert(), do_unlock(), do_cancel() | |
2264 | * These are called on the master node for the given lock and | |
2265 | * from the central locking logic. | |
2266 | */ | |
2267 | ||
2268 | static int do_request(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2269 | { | |
2270 | int error = 0; | |
2271 | ||
c85d65e9 | 2272 | if (can_be_granted(r, lkb, 1, NULL)) { |
e7fd4179 DT |
2273 | grant_lock(r, lkb); |
2274 | queue_cast(r, lkb, 0); | |
2275 | goto out; | |
2276 | } | |
2277 | ||
2278 | if (can_be_queued(lkb)) { | |
2279 | error = -EINPROGRESS; | |
2280 | add_lkb(r, lkb, DLM_LKSTS_WAITING); | |
3ae1acf9 | 2281 | add_timeout(lkb); |
e7fd4179 DT |
2282 | goto out; |
2283 | } | |
2284 | ||
2285 | error = -EAGAIN; | |
e7fd4179 | 2286 | queue_cast(r, lkb, -EAGAIN); |
e7fd4179 DT |
2287 | out: |
2288 | return error; | |
2289 | } | |
2290 | ||
cf6620ac DT |
2291 | static void do_request_effects(struct dlm_rsb *r, struct dlm_lkb *lkb, |
2292 | int error) | |
2293 | { | |
2294 | switch (error) { | |
2295 | case -EAGAIN: | |
2296 | if (force_blocking_asts(lkb)) | |
2297 | send_blocking_asts_all(r, lkb); | |
2298 | break; | |
2299 | case -EINPROGRESS: | |
2300 | send_blocking_asts(r, lkb); | |
2301 | break; | |
2302 | } | |
2303 | } | |
2304 | ||
e7fd4179 DT |
2305 | static int do_convert(struct dlm_rsb *r, struct dlm_lkb *lkb) |
2306 | { | |
2307 | int error = 0; | |
c85d65e9 | 2308 | int deadlk = 0; |
e7fd4179 DT |
2309 | |
2310 | /* changing an existing lock may allow others to be granted */ | |
2311 | ||
c85d65e9 | 2312 | if (can_be_granted(r, lkb, 1, &deadlk)) { |
e7fd4179 DT |
2313 | grant_lock(r, lkb); |
2314 | queue_cast(r, lkb, 0); | |
e7fd4179 DT |
2315 | goto out; |
2316 | } | |
2317 | ||
c85d65e9 DT |
2318 | /* can_be_granted() detected that this lock would block in a conversion |
2319 | deadlock, so we leave it on the granted queue and return EDEADLK in | |
2320 | the ast for the convert. */ | |
2321 | ||
2322 | if (deadlk) { | |
2323 | /* it's left on the granted queue */ | |
2324 | log_debug(r->res_ls, "deadlock %x node %d sts%d g%d r%d %s", | |
2325 | lkb->lkb_id, lkb->lkb_nodeid, lkb->lkb_status, | |
2326 | lkb->lkb_grmode, lkb->lkb_rqmode, r->res_name); | |
2327 | revert_lock(r, lkb); | |
2328 | queue_cast(r, lkb, -EDEADLK); | |
2329 | error = -EDEADLK; | |
2330 | goto out; | |
2331 | } | |
2332 | ||
7d3c1feb DT |
2333 | /* is_demoted() means the can_be_granted() above set the grmode |
2334 | to NL, and left us on the granted queue. This auto-demotion | |
2335 | (due to CONVDEADLK) might mean other locks, and/or this lock, are | |
2336 | now grantable. We have to try to grant other converting locks | |
2337 | before we try again to grant this one. */ | |
2338 | ||
2339 | if (is_demoted(lkb)) { | |
36509258 | 2340 | grant_pending_convert(r, DLM_LOCK_IV, NULL); |
7d3c1feb DT |
2341 | if (_can_be_granted(r, lkb, 1)) { |
2342 | grant_lock(r, lkb); | |
2343 | queue_cast(r, lkb, 0); | |
7d3c1feb DT |
2344 | goto out; |
2345 | } | |
2346 | /* else fall through and move to convert queue */ | |
2347 | } | |
2348 | ||
2349 | if (can_be_queued(lkb)) { | |
e7fd4179 DT |
2350 | error = -EINPROGRESS; |
2351 | del_lkb(r, lkb); | |
2352 | add_lkb(r, lkb, DLM_LKSTS_CONVERT); | |
3ae1acf9 | 2353 | add_timeout(lkb); |
e7fd4179 DT |
2354 | goto out; |
2355 | } | |
2356 | ||
2357 | error = -EAGAIN; | |
e7fd4179 | 2358 | queue_cast(r, lkb, -EAGAIN); |
e7fd4179 DT |
2359 | out: |
2360 | return error; | |
2361 | } | |
2362 | ||
cf6620ac DT |
2363 | static void do_convert_effects(struct dlm_rsb *r, struct dlm_lkb *lkb, |
2364 | int error) | |
2365 | { | |
2366 | switch (error) { | |
2367 | case 0: | |
2368 | grant_pending_locks(r); | |
2369 | /* grant_pending_locks also sends basts */ | |
2370 | break; | |
2371 | case -EAGAIN: | |
2372 | if (force_blocking_asts(lkb)) | |
2373 | send_blocking_asts_all(r, lkb); | |
2374 | break; | |
2375 | case -EINPROGRESS: | |
2376 | send_blocking_asts(r, lkb); | |
2377 | break; | |
2378 | } | |
2379 | } | |
2380 | ||
e7fd4179 DT |
2381 | static int do_unlock(struct dlm_rsb *r, struct dlm_lkb *lkb) |
2382 | { | |
2383 | remove_lock(r, lkb); | |
2384 | queue_cast(r, lkb, -DLM_EUNLOCK); | |
e7fd4179 DT |
2385 | return -DLM_EUNLOCK; |
2386 | } | |
2387 | ||
cf6620ac DT |
2388 | static void do_unlock_effects(struct dlm_rsb *r, struct dlm_lkb *lkb, |
2389 | int error) | |
2390 | { | |
2391 | grant_pending_locks(r); | |
2392 | } | |
2393 | ||
ef0c2bb0 | 2394 | /* returns: 0 did nothing, -DLM_ECANCEL canceled lock */ |
907b9bce | 2395 | |
e7fd4179 DT |
2396 | static int do_cancel(struct dlm_rsb *r, struct dlm_lkb *lkb) |
2397 | { | |
ef0c2bb0 DT |
2398 | int error; |
2399 | ||
2400 | error = revert_lock(r, lkb); | |
2401 | if (error) { | |
2402 | queue_cast(r, lkb, -DLM_ECANCEL); | |
ef0c2bb0 DT |
2403 | return -DLM_ECANCEL; |
2404 | } | |
2405 | return 0; | |
e7fd4179 DT |
2406 | } |
2407 | ||
cf6620ac DT |
2408 | static void do_cancel_effects(struct dlm_rsb *r, struct dlm_lkb *lkb, |
2409 | int error) | |
2410 | { | |
2411 | if (error) | |
2412 | grant_pending_locks(r); | |
2413 | } | |
2414 | ||
e7fd4179 DT |
2415 | /* |
2416 | * Four stage 3 varieties: | |
2417 | * _request_lock(), _convert_lock(), _unlock_lock(), _cancel_lock() | |
2418 | */ | |
2419 | ||
2420 | /* add a new lkb to a possibly new rsb, called by requesting process */ | |
2421 | ||
2422 | static int _request_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2423 | { | |
2424 | int error; | |
2425 | ||
2426 | /* set_master: sets lkb nodeid from r */ | |
2427 | ||
2428 | error = set_master(r, lkb); | |
2429 | if (error < 0) | |
2430 | goto out; | |
2431 | if (error) { | |
2432 | error = 0; | |
2433 | goto out; | |
2434 | } | |
2435 | ||
cf6620ac | 2436 | if (is_remote(r)) { |
e7fd4179 DT |
2437 | /* receive_request() calls do_request() on remote node */ |
2438 | error = send_request(r, lkb); | |
cf6620ac | 2439 | } else { |
e7fd4179 | 2440 | error = do_request(r, lkb); |
cf6620ac DT |
2441 | /* for remote locks the request_reply is sent |
2442 | between do_request and do_request_effects */ | |
2443 | do_request_effects(r, lkb, error); | |
2444 | } | |
e7fd4179 DT |
2445 | out: |
2446 | return error; | |
2447 | } | |
2448 | ||
3bcd3687 | 2449 | /* change some property of an existing lkb, e.g. mode */ |
e7fd4179 DT |
2450 | |
2451 | static int _convert_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2452 | { | |
2453 | int error; | |
2454 | ||
cf6620ac | 2455 | if (is_remote(r)) { |
e7fd4179 DT |
2456 | /* receive_convert() calls do_convert() on remote node */ |
2457 | error = send_convert(r, lkb); | |
cf6620ac | 2458 | } else { |
e7fd4179 | 2459 | error = do_convert(r, lkb); |
cf6620ac DT |
2460 | /* for remote locks the convert_reply is sent |
2461 | between do_convert and do_convert_effects */ | |
2462 | do_convert_effects(r, lkb, error); | |
2463 | } | |
e7fd4179 DT |
2464 | |
2465 | return error; | |
2466 | } | |
2467 | ||
2468 | /* remove an existing lkb from the granted queue */ | |
2469 | ||
2470 | static int _unlock_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2471 | { | |
2472 | int error; | |
2473 | ||
cf6620ac | 2474 | if (is_remote(r)) { |
e7fd4179 DT |
2475 | /* receive_unlock() calls do_unlock() on remote node */ |
2476 | error = send_unlock(r, lkb); | |
cf6620ac | 2477 | } else { |
e7fd4179 | 2478 | error = do_unlock(r, lkb); |
cf6620ac DT |
2479 | /* for remote locks the unlock_reply is sent |
2480 | between do_unlock and do_unlock_effects */ | |
2481 | do_unlock_effects(r, lkb, error); | |
2482 | } | |
e7fd4179 DT |
2483 | |
2484 | return error; | |
2485 | } | |
2486 | ||
2487 | /* remove an existing lkb from the convert or wait queue */ | |
2488 | ||
2489 | static int _cancel_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2490 | { | |
2491 | int error; | |
2492 | ||
cf6620ac | 2493 | if (is_remote(r)) { |
e7fd4179 DT |
2494 | /* receive_cancel() calls do_cancel() on remote node */ |
2495 | error = send_cancel(r, lkb); | |
cf6620ac | 2496 | } else { |
e7fd4179 | 2497 | error = do_cancel(r, lkb); |
cf6620ac DT |
2498 | /* for remote locks the cancel_reply is sent |
2499 | between do_cancel and do_cancel_effects */ | |
2500 | do_cancel_effects(r, lkb, error); | |
2501 | } | |
e7fd4179 DT |
2502 | |
2503 | return error; | |
2504 | } | |
2505 | ||
2506 | /* | |
2507 | * Four stage 2 varieties: | |
2508 | * request_lock(), convert_lock(), unlock_lock(), cancel_lock() | |
2509 | */ | |
2510 | ||
2511 | static int request_lock(struct dlm_ls *ls, struct dlm_lkb *lkb, char *name, | |
2512 | int len, struct dlm_args *args) | |
2513 | { | |
2514 | struct dlm_rsb *r; | |
2515 | int error; | |
2516 | ||
2517 | error = validate_lock_args(ls, lkb, args); | |
2518 | if (error) | |
2519 | goto out; | |
2520 | ||
2521 | error = find_rsb(ls, name, len, R_CREATE, &r); | |
2522 | if (error) | |
2523 | goto out; | |
2524 | ||
2525 | lock_rsb(r); | |
2526 | ||
2527 | attach_lkb(r, lkb); | |
2528 | lkb->lkb_lksb->sb_lkid = lkb->lkb_id; | |
2529 | ||
2530 | error = _request_lock(r, lkb); | |
2531 | ||
2532 | unlock_rsb(r); | |
2533 | put_rsb(r); | |
2534 | ||
2535 | out: | |
2536 | return error; | |
2537 | } | |
2538 | ||
2539 | static int convert_lock(struct dlm_ls *ls, struct dlm_lkb *lkb, | |
2540 | struct dlm_args *args) | |
2541 | { | |
2542 | struct dlm_rsb *r; | |
2543 | int error; | |
2544 | ||
2545 | r = lkb->lkb_resource; | |
2546 | ||
2547 | hold_rsb(r); | |
2548 | lock_rsb(r); | |
2549 | ||
2550 | error = validate_lock_args(ls, lkb, args); | |
2551 | if (error) | |
2552 | goto out; | |
2553 | ||
2554 | error = _convert_lock(r, lkb); | |
2555 | out: | |
2556 | unlock_rsb(r); | |
2557 | put_rsb(r); | |
2558 | return error; | |
2559 | } | |
2560 | ||
2561 | static int unlock_lock(struct dlm_ls *ls, struct dlm_lkb *lkb, | |
2562 | struct dlm_args *args) | |
2563 | { | |
2564 | struct dlm_rsb *r; | |
2565 | int error; | |
2566 | ||
2567 | r = lkb->lkb_resource; | |
2568 | ||
2569 | hold_rsb(r); | |
2570 | lock_rsb(r); | |
2571 | ||
2572 | error = validate_unlock_args(lkb, args); | |
2573 | if (error) | |
2574 | goto out; | |
2575 | ||
2576 | error = _unlock_lock(r, lkb); | |
2577 | out: | |
2578 | unlock_rsb(r); | |
2579 | put_rsb(r); | |
2580 | return error; | |
2581 | } | |
2582 | ||
2583 | static int cancel_lock(struct dlm_ls *ls, struct dlm_lkb *lkb, | |
2584 | struct dlm_args *args) | |
2585 | { | |
2586 | struct dlm_rsb *r; | |
2587 | int error; | |
2588 | ||
2589 | r = lkb->lkb_resource; | |
2590 | ||
2591 | hold_rsb(r); | |
2592 | lock_rsb(r); | |
2593 | ||
2594 | error = validate_unlock_args(lkb, args); | |
2595 | if (error) | |
2596 | goto out; | |
2597 | ||
2598 | error = _cancel_lock(r, lkb); | |
2599 | out: | |
2600 | unlock_rsb(r); | |
2601 | put_rsb(r); | |
2602 | return error; | |
2603 | } | |
2604 | ||
2605 | /* | |
2606 | * Two stage 1 varieties: dlm_lock() and dlm_unlock() | |
2607 | */ | |
2608 | ||
2609 | int dlm_lock(dlm_lockspace_t *lockspace, | |
2610 | int mode, | |
2611 | struct dlm_lksb *lksb, | |
2612 | uint32_t flags, | |
2613 | void *name, | |
2614 | unsigned int namelen, | |
2615 | uint32_t parent_lkid, | |
2616 | void (*ast) (void *astarg), | |
2617 | void *astarg, | |
3bcd3687 | 2618 | void (*bast) (void *astarg, int mode)) |
e7fd4179 DT |
2619 | { |
2620 | struct dlm_ls *ls; | |
2621 | struct dlm_lkb *lkb; | |
2622 | struct dlm_args args; | |
2623 | int error, convert = flags & DLM_LKF_CONVERT; | |
2624 | ||
2625 | ls = dlm_find_lockspace_local(lockspace); | |
2626 | if (!ls) | |
2627 | return -EINVAL; | |
2628 | ||
85e86edf | 2629 | dlm_lock_recovery(ls); |
e7fd4179 DT |
2630 | |
2631 | if (convert) | |
2632 | error = find_lkb(ls, lksb->sb_lkid, &lkb); | |
2633 | else | |
2634 | error = create_lkb(ls, &lkb); | |
2635 | ||
2636 | if (error) | |
2637 | goto out; | |
2638 | ||
d7db923e | 2639 | error = set_lock_args(mode, lksb, flags, namelen, 0, ast, |
3bcd3687 | 2640 | astarg, bast, &args); |
e7fd4179 DT |
2641 | if (error) |
2642 | goto out_put; | |
2643 | ||
2644 | if (convert) | |
2645 | error = convert_lock(ls, lkb, &args); | |
2646 | else | |
2647 | error = request_lock(ls, lkb, name, namelen, &args); | |
2648 | ||
2649 | if (error == -EINPROGRESS) | |
2650 | error = 0; | |
2651 | out_put: | |
2652 | if (convert || error) | |
b3f58d8f | 2653 | __put_lkb(ls, lkb); |
c85d65e9 | 2654 | if (error == -EAGAIN || error == -EDEADLK) |
e7fd4179 DT |
2655 | error = 0; |
2656 | out: | |
85e86edf | 2657 | dlm_unlock_recovery(ls); |
e7fd4179 DT |
2658 | dlm_put_lockspace(ls); |
2659 | return error; | |
2660 | } | |
2661 | ||
2662 | int dlm_unlock(dlm_lockspace_t *lockspace, | |
2663 | uint32_t lkid, | |
2664 | uint32_t flags, | |
2665 | struct dlm_lksb *lksb, | |
2666 | void *astarg) | |
2667 | { | |
2668 | struct dlm_ls *ls; | |
2669 | struct dlm_lkb *lkb; | |
2670 | struct dlm_args args; | |
2671 | int error; | |
2672 | ||
2673 | ls = dlm_find_lockspace_local(lockspace); | |
2674 | if (!ls) | |
2675 | return -EINVAL; | |
2676 | ||
85e86edf | 2677 | dlm_lock_recovery(ls); |
e7fd4179 DT |
2678 | |
2679 | error = find_lkb(ls, lkid, &lkb); | |
2680 | if (error) | |
2681 | goto out; | |
2682 | ||
2683 | error = set_unlock_args(flags, astarg, &args); | |
2684 | if (error) | |
2685 | goto out_put; | |
2686 | ||
2687 | if (flags & DLM_LKF_CANCEL) | |
2688 | error = cancel_lock(ls, lkb, &args); | |
2689 | else | |
2690 | error = unlock_lock(ls, lkb, &args); | |
2691 | ||
2692 | if (error == -DLM_EUNLOCK || error == -DLM_ECANCEL) | |
2693 | error = 0; | |
ef0c2bb0 DT |
2694 | if (error == -EBUSY && (flags & (DLM_LKF_CANCEL | DLM_LKF_FORCEUNLOCK))) |
2695 | error = 0; | |
e7fd4179 | 2696 | out_put: |
b3f58d8f | 2697 | dlm_put_lkb(lkb); |
e7fd4179 | 2698 | out: |
85e86edf | 2699 | dlm_unlock_recovery(ls); |
e7fd4179 DT |
2700 | dlm_put_lockspace(ls); |
2701 | return error; | |
2702 | } | |
2703 | ||
2704 | /* | |
2705 | * send/receive routines for remote operations and replies | |
2706 | * | |
2707 | * send_args | |
2708 | * send_common | |
2709 | * send_request receive_request | |
2710 | * send_convert receive_convert | |
2711 | * send_unlock receive_unlock | |
2712 | * send_cancel receive_cancel | |
2713 | * send_grant receive_grant | |
2714 | * send_bast receive_bast | |
2715 | * send_lookup receive_lookup | |
2716 | * send_remove receive_remove | |
2717 | * | |
2718 | * send_common_reply | |
2719 | * receive_request_reply send_request_reply | |
2720 | * receive_convert_reply send_convert_reply | |
2721 | * receive_unlock_reply send_unlock_reply | |
2722 | * receive_cancel_reply send_cancel_reply | |
2723 | * receive_lookup_reply send_lookup_reply | |
2724 | */ | |
2725 | ||
7e4dac33 DT |
2726 | static int _create_message(struct dlm_ls *ls, int mb_len, |
2727 | int to_nodeid, int mstype, | |
2728 | struct dlm_message **ms_ret, | |
2729 | struct dlm_mhandle **mh_ret) | |
e7fd4179 DT |
2730 | { |
2731 | struct dlm_message *ms; | |
2732 | struct dlm_mhandle *mh; | |
2733 | char *mb; | |
e7fd4179 DT |
2734 | |
2735 | /* get_buffer gives us a message handle (mh) that we need to | |
2736 | pass into lowcomms_commit and a message buffer (mb) that we | |
2737 | write our data into */ | |
2738 | ||
573c24c4 | 2739 | mh = dlm_lowcomms_get_buffer(to_nodeid, mb_len, GFP_NOFS, &mb); |
e7fd4179 DT |
2740 | if (!mh) |
2741 | return -ENOBUFS; | |
2742 | ||
2743 | memset(mb, 0, mb_len); | |
2744 | ||
2745 | ms = (struct dlm_message *) mb; | |
2746 | ||
2747 | ms->m_header.h_version = (DLM_HEADER_MAJOR | DLM_HEADER_MINOR); | |
7e4dac33 | 2748 | ms->m_header.h_lockspace = ls->ls_global_id; |
e7fd4179 DT |
2749 | ms->m_header.h_nodeid = dlm_our_nodeid(); |
2750 | ms->m_header.h_length = mb_len; | |
2751 | ms->m_header.h_cmd = DLM_MSG; | |
2752 | ||
2753 | ms->m_type = mstype; | |
2754 | ||
2755 | *mh_ret = mh; | |
2756 | *ms_ret = ms; | |
2757 | return 0; | |
2758 | } | |
2759 | ||
7e4dac33 DT |
2760 | static int create_message(struct dlm_rsb *r, struct dlm_lkb *lkb, |
2761 | int to_nodeid, int mstype, | |
2762 | struct dlm_message **ms_ret, | |
2763 | struct dlm_mhandle **mh_ret) | |
2764 | { | |
2765 | int mb_len = sizeof(struct dlm_message); | |
2766 | ||
2767 | switch (mstype) { | |
2768 | case DLM_MSG_REQUEST: | |
2769 | case DLM_MSG_LOOKUP: | |
2770 | case DLM_MSG_REMOVE: | |
2771 | mb_len += r->res_length; | |
2772 | break; | |
2773 | case DLM_MSG_CONVERT: | |
2774 | case DLM_MSG_UNLOCK: | |
2775 | case DLM_MSG_REQUEST_REPLY: | |
2776 | case DLM_MSG_CONVERT_REPLY: | |
2777 | case DLM_MSG_GRANT: | |
2778 | if (lkb && lkb->lkb_lvbptr) | |
2779 | mb_len += r->res_ls->ls_lvblen; | |
2780 | break; | |
2781 | } | |
2782 | ||
2783 | return _create_message(r->res_ls, mb_len, to_nodeid, mstype, | |
2784 | ms_ret, mh_ret); | |
2785 | } | |
2786 | ||
e7fd4179 DT |
2787 | /* further lowcomms enhancements or alternate implementations may make |
2788 | the return value from this function useful at some point */ | |
2789 | ||
2790 | static int send_message(struct dlm_mhandle *mh, struct dlm_message *ms) | |
2791 | { | |
2792 | dlm_message_out(ms); | |
2793 | dlm_lowcomms_commit_buffer(mh); | |
2794 | return 0; | |
2795 | } | |
2796 | ||
2797 | static void send_args(struct dlm_rsb *r, struct dlm_lkb *lkb, | |
2798 | struct dlm_message *ms) | |
2799 | { | |
2800 | ms->m_nodeid = lkb->lkb_nodeid; | |
2801 | ms->m_pid = lkb->lkb_ownpid; | |
2802 | ms->m_lkid = lkb->lkb_id; | |
2803 | ms->m_remid = lkb->lkb_remid; | |
2804 | ms->m_exflags = lkb->lkb_exflags; | |
2805 | ms->m_sbflags = lkb->lkb_sbflags; | |
2806 | ms->m_flags = lkb->lkb_flags; | |
2807 | ms->m_lvbseq = lkb->lkb_lvbseq; | |
2808 | ms->m_status = lkb->lkb_status; | |
2809 | ms->m_grmode = lkb->lkb_grmode; | |
2810 | ms->m_rqmode = lkb->lkb_rqmode; | |
2811 | ms->m_hash = r->res_hash; | |
2812 | ||
2813 | /* m_result and m_bastmode are set from function args, | |
2814 | not from lkb fields */ | |
2815 | ||
e5dae548 | 2816 | if (lkb->lkb_bastfn) |
8304d6f2 | 2817 | ms->m_asts |= DLM_CB_BAST; |
e5dae548 | 2818 | if (lkb->lkb_astfn) |
8304d6f2 | 2819 | ms->m_asts |= DLM_CB_CAST; |
e7fd4179 | 2820 | |
da49f36f DT |
2821 | /* compare with switch in create_message; send_remove() doesn't |
2822 | use send_args() */ | |
e7fd4179 | 2823 | |
da49f36f DT |
2824 | switch (ms->m_type) { |
2825 | case DLM_MSG_REQUEST: | |
2826 | case DLM_MSG_LOOKUP: | |
2827 | memcpy(ms->m_extra, r->res_name, r->res_length); | |
2828 | break; | |
2829 | case DLM_MSG_CONVERT: | |
2830 | case DLM_MSG_UNLOCK: | |
2831 | case DLM_MSG_REQUEST_REPLY: | |
2832 | case DLM_MSG_CONVERT_REPLY: | |
2833 | case DLM_MSG_GRANT: | |
2834 | if (!lkb->lkb_lvbptr) | |
2835 | break; | |
e7fd4179 | 2836 | memcpy(ms->m_extra, lkb->lkb_lvbptr, r->res_ls->ls_lvblen); |
da49f36f DT |
2837 | break; |
2838 | } | |
e7fd4179 DT |
2839 | } |
2840 | ||
2841 | static int send_common(struct dlm_rsb *r, struct dlm_lkb *lkb, int mstype) | |
2842 | { | |
2843 | struct dlm_message *ms; | |
2844 | struct dlm_mhandle *mh; | |
2845 | int to_nodeid, error; | |
2846 | ||
ef0c2bb0 DT |
2847 | error = add_to_waiters(lkb, mstype); |
2848 | if (error) | |
2849 | return error; | |
e7fd4179 DT |
2850 | |
2851 | to_nodeid = r->res_nodeid; | |
2852 | ||
2853 | error = create_message(r, lkb, to_nodeid, mstype, &ms, &mh); | |
2854 | if (error) | |
2855 | goto fail; | |
2856 | ||
2857 | send_args(r, lkb, ms); | |
2858 | ||
2859 | error = send_message(mh, ms); | |
2860 | if (error) | |
2861 | goto fail; | |
2862 | return 0; | |
2863 | ||
2864 | fail: | |
ef0c2bb0 | 2865 | remove_from_waiters(lkb, msg_reply_type(mstype)); |
e7fd4179 DT |
2866 | return error; |
2867 | } | |
2868 | ||
2869 | static int send_request(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2870 | { | |
2871 | return send_common(r, lkb, DLM_MSG_REQUEST); | |
2872 | } | |
2873 | ||
2874 | static int send_convert(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2875 | { | |
2876 | int error; | |
2877 | ||
2878 | error = send_common(r, lkb, DLM_MSG_CONVERT); | |
2879 | ||
2880 | /* down conversions go without a reply from the master */ | |
2881 | if (!error && down_conversion(lkb)) { | |
ef0c2bb0 DT |
2882 | remove_from_waiters(lkb, DLM_MSG_CONVERT_REPLY); |
2883 | r->res_ls->ls_stub_ms.m_type = DLM_MSG_CONVERT_REPLY; | |
e7fd4179 | 2884 | r->res_ls->ls_stub_ms.m_result = 0; |
32f105a1 | 2885 | r->res_ls->ls_stub_ms.m_flags = lkb->lkb_flags; |
e7fd4179 DT |
2886 | __receive_convert_reply(r, lkb, &r->res_ls->ls_stub_ms); |
2887 | } | |
2888 | ||
2889 | return error; | |
2890 | } | |
2891 | ||
2892 | /* FIXME: if this lkb is the only lock we hold on the rsb, then set | |
2893 | MASTER_UNCERTAIN to force the next request on the rsb to confirm | |
2894 | that the master is still correct. */ | |
2895 | ||
2896 | static int send_unlock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2897 | { | |
2898 | return send_common(r, lkb, DLM_MSG_UNLOCK); | |
2899 | } | |
2900 | ||
2901 | static int send_cancel(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2902 | { | |
2903 | return send_common(r, lkb, DLM_MSG_CANCEL); | |
2904 | } | |
2905 | ||
2906 | static int send_grant(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2907 | { | |
2908 | struct dlm_message *ms; | |
2909 | struct dlm_mhandle *mh; | |
2910 | int to_nodeid, error; | |
2911 | ||
2912 | to_nodeid = lkb->lkb_nodeid; | |
2913 | ||
2914 | error = create_message(r, lkb, to_nodeid, DLM_MSG_GRANT, &ms, &mh); | |
2915 | if (error) | |
2916 | goto out; | |
2917 | ||
2918 | send_args(r, lkb, ms); | |
2919 | ||
2920 | ms->m_result = 0; | |
2921 | ||
2922 | error = send_message(mh, ms); | |
2923 | out: | |
2924 | return error; | |
2925 | } | |
2926 | ||
2927 | static int send_bast(struct dlm_rsb *r, struct dlm_lkb *lkb, int mode) | |
2928 | { | |
2929 | struct dlm_message *ms; | |
2930 | struct dlm_mhandle *mh; | |
2931 | int to_nodeid, error; | |
2932 | ||
2933 | to_nodeid = lkb->lkb_nodeid; | |
2934 | ||
2935 | error = create_message(r, NULL, to_nodeid, DLM_MSG_BAST, &ms, &mh); | |
2936 | if (error) | |
2937 | goto out; | |
2938 | ||
2939 | send_args(r, lkb, ms); | |
2940 | ||
2941 | ms->m_bastmode = mode; | |
2942 | ||
2943 | error = send_message(mh, ms); | |
2944 | out: | |
2945 | return error; | |
2946 | } | |
2947 | ||
2948 | static int send_lookup(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2949 | { | |
2950 | struct dlm_message *ms; | |
2951 | struct dlm_mhandle *mh; | |
2952 | int to_nodeid, error; | |
2953 | ||
ef0c2bb0 DT |
2954 | error = add_to_waiters(lkb, DLM_MSG_LOOKUP); |
2955 | if (error) | |
2956 | return error; | |
e7fd4179 DT |
2957 | |
2958 | to_nodeid = dlm_dir_nodeid(r); | |
2959 | ||
2960 | error = create_message(r, NULL, to_nodeid, DLM_MSG_LOOKUP, &ms, &mh); | |
2961 | if (error) | |
2962 | goto fail; | |
2963 | ||
2964 | send_args(r, lkb, ms); | |
2965 | ||
2966 | error = send_message(mh, ms); | |
2967 | if (error) | |
2968 | goto fail; | |
2969 | return 0; | |
2970 | ||
2971 | fail: | |
ef0c2bb0 | 2972 | remove_from_waiters(lkb, DLM_MSG_LOOKUP_REPLY); |
e7fd4179 DT |
2973 | return error; |
2974 | } | |
2975 | ||
2976 | static int send_remove(struct dlm_rsb *r) | |
2977 | { | |
2978 | struct dlm_message *ms; | |
2979 | struct dlm_mhandle *mh; | |
2980 | int to_nodeid, error; | |
2981 | ||
2982 | to_nodeid = dlm_dir_nodeid(r); | |
2983 | ||
2984 | error = create_message(r, NULL, to_nodeid, DLM_MSG_REMOVE, &ms, &mh); | |
2985 | if (error) | |
2986 | goto out; | |
2987 | ||
2988 | memcpy(ms->m_extra, r->res_name, r->res_length); | |
2989 | ms->m_hash = r->res_hash; | |
2990 | ||
2991 | error = send_message(mh, ms); | |
2992 | out: | |
2993 | return error; | |
2994 | } | |
2995 | ||
2996 | static int send_common_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, | |
2997 | int mstype, int rv) | |
2998 | { | |
2999 | struct dlm_message *ms; | |
3000 | struct dlm_mhandle *mh; | |
3001 | int to_nodeid, error; | |
3002 | ||
3003 | to_nodeid = lkb->lkb_nodeid; | |
3004 | ||
3005 | error = create_message(r, lkb, to_nodeid, mstype, &ms, &mh); | |
3006 | if (error) | |
3007 | goto out; | |
3008 | ||
3009 | send_args(r, lkb, ms); | |
3010 | ||
3011 | ms->m_result = rv; | |
3012 | ||
3013 | error = send_message(mh, ms); | |
3014 | out: | |
3015 | return error; | |
3016 | } | |
3017 | ||
3018 | static int send_request_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv) | |
3019 | { | |
3020 | return send_common_reply(r, lkb, DLM_MSG_REQUEST_REPLY, rv); | |
3021 | } | |
3022 | ||
3023 | static int send_convert_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv) | |
3024 | { | |
3025 | return send_common_reply(r, lkb, DLM_MSG_CONVERT_REPLY, rv); | |
3026 | } | |
3027 | ||
3028 | static int send_unlock_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv) | |
3029 | { | |
3030 | return send_common_reply(r, lkb, DLM_MSG_UNLOCK_REPLY, rv); | |
3031 | } | |
3032 | ||
3033 | static int send_cancel_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv) | |
3034 | { | |
3035 | return send_common_reply(r, lkb, DLM_MSG_CANCEL_REPLY, rv); | |
3036 | } | |
3037 | ||
3038 | static int send_lookup_reply(struct dlm_ls *ls, struct dlm_message *ms_in, | |
3039 | int ret_nodeid, int rv) | |
3040 | { | |
3041 | struct dlm_rsb *r = &ls->ls_stub_rsb; | |
3042 | struct dlm_message *ms; | |
3043 | struct dlm_mhandle *mh; | |
3044 | int error, nodeid = ms_in->m_header.h_nodeid; | |
3045 | ||
3046 | error = create_message(r, NULL, nodeid, DLM_MSG_LOOKUP_REPLY, &ms, &mh); | |
3047 | if (error) | |
3048 | goto out; | |
3049 | ||
3050 | ms->m_lkid = ms_in->m_lkid; | |
3051 | ms->m_result = rv; | |
3052 | ms->m_nodeid = ret_nodeid; | |
3053 | ||
3054 | error = send_message(mh, ms); | |
3055 | out: | |
3056 | return error; | |
3057 | } | |
3058 | ||
3059 | /* which args we save from a received message depends heavily on the type | |
3060 | of message, unlike the send side where we can safely send everything about | |
3061 | the lkb for any type of message */ | |
3062 | ||
3063 | static void receive_flags(struct dlm_lkb *lkb, struct dlm_message *ms) | |
3064 | { | |
3065 | lkb->lkb_exflags = ms->m_exflags; | |
6f90a8b1 | 3066 | lkb->lkb_sbflags = ms->m_sbflags; |
e7fd4179 DT |
3067 | lkb->lkb_flags = (lkb->lkb_flags & 0xFFFF0000) | |
3068 | (ms->m_flags & 0x0000FFFF); | |
3069 | } | |
3070 | ||
3071 | static void receive_flags_reply(struct dlm_lkb *lkb, struct dlm_message *ms) | |
3072 | { | |
3073 | lkb->lkb_sbflags = ms->m_sbflags; | |
3074 | lkb->lkb_flags = (lkb->lkb_flags & 0xFFFF0000) | | |
3075 | (ms->m_flags & 0x0000FFFF); | |
3076 | } | |
3077 | ||
3078 | static int receive_extralen(struct dlm_message *ms) | |
3079 | { | |
3080 | return (ms->m_header.h_length - sizeof(struct dlm_message)); | |
3081 | } | |
3082 | ||
e7fd4179 DT |
3083 | static int receive_lvb(struct dlm_ls *ls, struct dlm_lkb *lkb, |
3084 | struct dlm_message *ms) | |
3085 | { | |
3086 | int len; | |
3087 | ||
3088 | if (lkb->lkb_exflags & DLM_LKF_VALBLK) { | |
3089 | if (!lkb->lkb_lvbptr) | |
52bda2b5 | 3090 | lkb->lkb_lvbptr = dlm_allocate_lvb(ls); |
e7fd4179 DT |
3091 | if (!lkb->lkb_lvbptr) |
3092 | return -ENOMEM; | |
3093 | len = receive_extralen(ms); | |
a9cc9159 AV |
3094 | if (len > DLM_RESNAME_MAXLEN) |
3095 | len = DLM_RESNAME_MAXLEN; | |
e7fd4179 DT |
3096 | memcpy(lkb->lkb_lvbptr, ms->m_extra, len); |
3097 | } | |
3098 | return 0; | |
3099 | } | |
3100 | ||
e5dae548 DT |
3101 | static void fake_bastfn(void *astparam, int mode) |
3102 | { | |
3103 | log_print("fake_bastfn should not be called"); | |
3104 | } | |
3105 | ||
3106 | static void fake_astfn(void *astparam) | |
3107 | { | |
3108 | log_print("fake_astfn should not be called"); | |
3109 | } | |
3110 | ||
e7fd4179 DT |
3111 | static int receive_request_args(struct dlm_ls *ls, struct dlm_lkb *lkb, |
3112 | struct dlm_message *ms) | |
3113 | { | |
3114 | lkb->lkb_nodeid = ms->m_header.h_nodeid; | |
3115 | lkb->lkb_ownpid = ms->m_pid; | |
3116 | lkb->lkb_remid = ms->m_lkid; | |
3117 | lkb->lkb_grmode = DLM_LOCK_IV; | |
3118 | lkb->lkb_rqmode = ms->m_rqmode; | |
e5dae548 | 3119 | |
8304d6f2 DT |
3120 | lkb->lkb_bastfn = (ms->m_asts & DLM_CB_BAST) ? &fake_bastfn : NULL; |
3121 | lkb->lkb_astfn = (ms->m_asts & DLM_CB_CAST) ? &fake_astfn : NULL; | |
e7fd4179 | 3122 | |
8d07fd50 DT |
3123 | if (lkb->lkb_exflags & DLM_LKF_VALBLK) { |
3124 | /* lkb was just created so there won't be an lvb yet */ | |
52bda2b5 | 3125 | lkb->lkb_lvbptr = dlm_allocate_lvb(ls); |
8d07fd50 DT |
3126 | if (!lkb->lkb_lvbptr) |
3127 | return -ENOMEM; | |
3128 | } | |
e7fd4179 DT |
3129 | |
3130 | return 0; | |
3131 | } | |
3132 | ||
3133 | static int receive_convert_args(struct dlm_ls *ls, struct dlm_lkb *lkb, | |
3134 | struct dlm_message *ms) | |
3135 | { | |
e7fd4179 DT |
3136 | if (lkb->lkb_status != DLM_LKSTS_GRANTED) |
3137 | return -EBUSY; | |
3138 | ||
e7fd4179 DT |
3139 | if (receive_lvb(ls, lkb, ms)) |
3140 | return -ENOMEM; | |
3141 | ||
3142 | lkb->lkb_rqmode = ms->m_rqmode; | |
3143 | lkb->lkb_lvbseq = ms->m_lvbseq; | |
3144 | ||
3145 | return 0; | |
3146 | } | |
3147 | ||
3148 | static int receive_unlock_args(struct dlm_ls *ls, struct dlm_lkb *lkb, | |
3149 | struct dlm_message *ms) | |
3150 | { | |
e7fd4179 DT |
3151 | if (receive_lvb(ls, lkb, ms)) |
3152 | return -ENOMEM; | |
3153 | return 0; | |
3154 | } | |
3155 | ||
3156 | /* We fill in the stub-lkb fields with the info that send_xxxx_reply() | |
3157 | uses to send a reply and that the remote end uses to process the reply. */ | |
3158 | ||
3159 | static void setup_stub_lkb(struct dlm_ls *ls, struct dlm_message *ms) | |
3160 | { | |
3161 | struct dlm_lkb *lkb = &ls->ls_stub_lkb; | |
3162 | lkb->lkb_nodeid = ms->m_header.h_nodeid; | |
3163 | lkb->lkb_remid = ms->m_lkid; | |
3164 | } | |
3165 | ||
c54e04b0 DT |
3166 | /* This is called after the rsb is locked so that we can safely inspect |
3167 | fields in the lkb. */ | |
3168 | ||
3169 | static int validate_message(struct dlm_lkb *lkb, struct dlm_message *ms) | |
3170 | { | |
3171 | int from = ms->m_header.h_nodeid; | |
3172 | int error = 0; | |
3173 | ||
3174 | switch (ms->m_type) { | |
3175 | case DLM_MSG_CONVERT: | |
3176 | case DLM_MSG_UNLOCK: | |
3177 | case DLM_MSG_CANCEL: | |
3178 | if (!is_master_copy(lkb) || lkb->lkb_nodeid != from) | |
3179 | error = -EINVAL; | |
3180 | break; | |
3181 | ||
3182 | case DLM_MSG_CONVERT_REPLY: | |
3183 | case DLM_MSG_UNLOCK_REPLY: | |
3184 | case DLM_MSG_CANCEL_REPLY: | |
3185 | case DLM_MSG_GRANT: | |
3186 | case DLM_MSG_BAST: | |
3187 | if (!is_process_copy(lkb) || lkb->lkb_nodeid != from) | |
3188 | error = -EINVAL; | |
3189 | break; | |
3190 | ||
3191 | case DLM_MSG_REQUEST_REPLY: | |
3192 | if (!is_process_copy(lkb)) | |
3193 | error = -EINVAL; | |
3194 | else if (lkb->lkb_nodeid != -1 && lkb->lkb_nodeid != from) | |
3195 | error = -EINVAL; | |
3196 | break; | |
3197 | ||
3198 | default: | |
3199 | error = -EINVAL; | |
3200 | } | |
3201 | ||
3202 | if (error) | |
3203 | log_error(lkb->lkb_resource->res_ls, | |
3204 | "ignore invalid message %d from %d %x %x %x %d", | |
3205 | ms->m_type, from, lkb->lkb_id, lkb->lkb_remid, | |
3206 | lkb->lkb_flags, lkb->lkb_nodeid); | |
3207 | return error; | |
3208 | } | |
3209 | ||
e7fd4179 DT |
3210 | static void receive_request(struct dlm_ls *ls, struct dlm_message *ms) |
3211 | { | |
3212 | struct dlm_lkb *lkb; | |
3213 | struct dlm_rsb *r; | |
3214 | int error, namelen; | |
3215 | ||
3216 | error = create_lkb(ls, &lkb); | |
3217 | if (error) | |
3218 | goto fail; | |
3219 | ||
3220 | receive_flags(lkb, ms); | |
3221 | lkb->lkb_flags |= DLM_IFL_MSTCPY; | |
3222 | error = receive_request_args(ls, lkb, ms); | |
3223 | if (error) { | |
b3f58d8f | 3224 | __put_lkb(ls, lkb); |
e7fd4179 DT |
3225 | goto fail; |
3226 | } | |
3227 | ||
3228 | namelen = receive_extralen(ms); | |
3229 | ||
3230 | error = find_rsb(ls, ms->m_extra, namelen, R_MASTER, &r); | |
3231 | if (error) { | |
b3f58d8f | 3232 | __put_lkb(ls, lkb); |
e7fd4179 DT |
3233 | goto fail; |
3234 | } | |
3235 | ||
3236 | lock_rsb(r); | |
3237 | ||
3238 | attach_lkb(r, lkb); | |
3239 | error = do_request(r, lkb); | |
3240 | send_request_reply(r, lkb, error); | |
cf6620ac | 3241 | do_request_effects(r, lkb, error); |
e7fd4179 DT |
3242 | |
3243 | unlock_rsb(r); | |
3244 | put_rsb(r); | |
3245 | ||
3246 | if (error == -EINPROGRESS) | |
3247 | error = 0; | |
3248 | if (error) | |
b3f58d8f | 3249 | dlm_put_lkb(lkb); |
e7fd4179 DT |
3250 | return; |
3251 | ||
3252 | fail: | |
3253 | setup_stub_lkb(ls, ms); | |
3254 | send_request_reply(&ls->ls_stub_rsb, &ls->ls_stub_lkb, error); | |
3255 | } | |
3256 | ||
3257 | static void receive_convert(struct dlm_ls *ls, struct dlm_message *ms) | |
3258 | { | |
3259 | struct dlm_lkb *lkb; | |
3260 | struct dlm_rsb *r; | |
90135925 | 3261 | int error, reply = 1; |
e7fd4179 DT |
3262 | |
3263 | error = find_lkb(ls, ms->m_remid, &lkb); | |
3264 | if (error) | |
3265 | goto fail; | |
3266 | ||
3267 | r = lkb->lkb_resource; | |
3268 | ||
3269 | hold_rsb(r); | |
3270 | lock_rsb(r); | |
3271 | ||
c54e04b0 DT |
3272 | error = validate_message(lkb, ms); |
3273 | if (error) | |
3274 | goto out; | |
3275 | ||
e7fd4179 | 3276 | receive_flags(lkb, ms); |
cf6620ac | 3277 | |
e7fd4179 | 3278 | error = receive_convert_args(ls, lkb, ms); |
cf6620ac DT |
3279 | if (error) { |
3280 | send_convert_reply(r, lkb, error); | |
3281 | goto out; | |
3282 | } | |
3283 | ||
e7fd4179 DT |
3284 | reply = !down_conversion(lkb); |
3285 | ||
3286 | error = do_convert(r, lkb); | |
e7fd4179 DT |
3287 | if (reply) |
3288 | send_convert_reply(r, lkb, error); | |
cf6620ac | 3289 | do_convert_effects(r, lkb, error); |
c54e04b0 | 3290 | out: |
e7fd4179 DT |
3291 | unlock_rsb(r); |
3292 | put_rsb(r); | |
b3f58d8f | 3293 | dlm_put_lkb(lkb); |
e7fd4179 DT |
3294 | return; |
3295 | ||
3296 | fail: | |
3297 | setup_stub_lkb(ls, ms); | |
3298 | send_convert_reply(&ls->ls_stub_rsb, &ls->ls_stub_lkb, error); | |
3299 | } | |
3300 | ||
3301 | static void receive_unlock(struct dlm_ls *ls, struct dlm_message *ms) | |
3302 | { | |
3303 | struct dlm_lkb *lkb; | |
3304 | struct dlm_rsb *r; | |
3305 | int error; | |
3306 | ||
3307 | error = find_lkb(ls, ms->m_remid, &lkb); | |
3308 | if (error) | |
3309 | goto fail; | |
3310 | ||
3311 | r = lkb->lkb_resource; | |
3312 | ||
3313 | hold_rsb(r); | |
3314 | lock_rsb(r); | |
3315 | ||
c54e04b0 DT |
3316 | error = validate_message(lkb, ms); |
3317 | if (error) | |
3318 | goto out; | |
3319 | ||
e7fd4179 | 3320 | receive_flags(lkb, ms); |
cf6620ac | 3321 | |
e7fd4179 | 3322 | error = receive_unlock_args(ls, lkb, ms); |
cf6620ac DT |
3323 | if (error) { |
3324 | send_unlock_reply(r, lkb, error); | |
3325 | goto out; | |
3326 | } | |
e7fd4179 DT |
3327 | |
3328 | error = do_unlock(r, lkb); | |
e7fd4179 | 3329 | send_unlock_reply(r, lkb, error); |
cf6620ac | 3330 | do_unlock_effects(r, lkb, error); |
c54e04b0 | 3331 | out: |
e7fd4179 DT |
3332 | unlock_rsb(r); |
3333 | put_rsb(r); | |
b3f58d8f | 3334 | dlm_put_lkb(lkb); |
e7fd4179 DT |
3335 | return; |
3336 | ||
3337 | fail: | |
3338 | setup_stub_lkb(ls, ms); | |
3339 | send_unlock_reply(&ls->ls_stub_rsb, &ls->ls_stub_lkb, error); | |
3340 | } | |
3341 | ||
3342 | static void receive_cancel(struct dlm_ls *ls, struct dlm_message *ms) | |
3343 | { | |
3344 | struct dlm_lkb *lkb; | |
3345 | struct dlm_rsb *r; | |
3346 | int error; | |
3347 | ||
3348 | error = find_lkb(ls, ms->m_remid, &lkb); | |
3349 | if (error) | |
3350 | goto fail; | |
3351 | ||
3352 | receive_flags(lkb, ms); | |
3353 | ||
3354 | r = lkb->lkb_resource; | |
3355 | ||
3356 | hold_rsb(r); | |
3357 | lock_rsb(r); | |
3358 | ||
c54e04b0 DT |
3359 | error = validate_message(lkb, ms); |
3360 | if (error) | |
3361 | goto out; | |
3362 | ||
e7fd4179 DT |
3363 | error = do_cancel(r, lkb); |
3364 | send_cancel_reply(r, lkb, error); | |
cf6620ac | 3365 | do_cancel_effects(r, lkb, error); |
c54e04b0 | 3366 | out: |
e7fd4179 DT |
3367 | unlock_rsb(r); |
3368 | put_rsb(r); | |
b3f58d8f | 3369 | dlm_put_lkb(lkb); |
e7fd4179 DT |
3370 | return; |
3371 | ||
3372 | fail: | |
3373 | setup_stub_lkb(ls, ms); | |
3374 | send_cancel_reply(&ls->ls_stub_rsb, &ls->ls_stub_lkb, error); | |
3375 | } | |
3376 | ||
3377 | static void receive_grant(struct dlm_ls *ls, struct dlm_message *ms) | |
3378 | { | |
3379 | struct dlm_lkb *lkb; | |
3380 | struct dlm_rsb *r; | |
3381 | int error; | |
3382 | ||
3383 | error = find_lkb(ls, ms->m_remid, &lkb); | |
3384 | if (error) { | |
c54e04b0 DT |
3385 | log_debug(ls, "receive_grant from %d no lkb %x", |
3386 | ms->m_header.h_nodeid, ms->m_remid); | |
e7fd4179 DT |
3387 | return; |
3388 | } | |
e7fd4179 DT |
3389 | |
3390 | r = lkb->lkb_resource; | |
3391 | ||
3392 | hold_rsb(r); | |
3393 | lock_rsb(r); | |
3394 | ||
c54e04b0 DT |
3395 | error = validate_message(lkb, ms); |
3396 | if (error) | |
3397 | goto out; | |
3398 | ||
e7fd4179 | 3399 | receive_flags_reply(lkb, ms); |
7d3c1feb DT |
3400 | if (is_altmode(lkb)) |
3401 | munge_altmode(lkb, ms); | |
e7fd4179 DT |
3402 | grant_lock_pc(r, lkb, ms); |
3403 | queue_cast(r, lkb, 0); | |
c54e04b0 | 3404 | out: |
e7fd4179 DT |
3405 | unlock_rsb(r); |
3406 | put_rsb(r); | |
b3f58d8f | 3407 | dlm_put_lkb(lkb); |
e7fd4179 DT |
3408 | } |
3409 | ||
3410 | static void receive_bast(struct dlm_ls *ls, struct dlm_message *ms) | |
3411 | { | |
3412 | struct dlm_lkb *lkb; | |
3413 | struct dlm_rsb *r; | |
3414 | int error; | |
3415 | ||
3416 | error = find_lkb(ls, ms->m_remid, &lkb); | |
3417 | if (error) { | |
c54e04b0 DT |
3418 | log_debug(ls, "receive_bast from %d no lkb %x", |
3419 | ms->m_header.h_nodeid, ms->m_remid); | |
e7fd4179 DT |
3420 | return; |
3421 | } | |
e7fd4179 DT |
3422 | |
3423 | r = lkb->lkb_resource; | |
3424 | ||
3425 | hold_rsb(r); | |
3426 | lock_rsb(r); | |
3427 | ||
c54e04b0 DT |
3428 | error = validate_message(lkb, ms); |
3429 | if (error) | |
3430 | goto out; | |
e7fd4179 | 3431 | |
c54e04b0 DT |
3432 | queue_bast(r, lkb, ms->m_bastmode); |
3433 | out: | |
e7fd4179 DT |
3434 | unlock_rsb(r); |
3435 | put_rsb(r); | |
b3f58d8f | 3436 | dlm_put_lkb(lkb); |
e7fd4179 DT |
3437 | } |
3438 | ||
3439 | static void receive_lookup(struct dlm_ls *ls, struct dlm_message *ms) | |
3440 | { | |
3441 | int len, error, ret_nodeid, dir_nodeid, from_nodeid, our_nodeid; | |
3442 | ||
3443 | from_nodeid = ms->m_header.h_nodeid; | |
3444 | our_nodeid = dlm_our_nodeid(); | |
3445 | ||
3446 | len = receive_extralen(ms); | |
3447 | ||
3448 | dir_nodeid = dlm_hash2nodeid(ls, ms->m_hash); | |
3449 | if (dir_nodeid != our_nodeid) { | |
3450 | log_error(ls, "lookup dir_nodeid %d from %d", | |
3451 | dir_nodeid, from_nodeid); | |
3452 | error = -EINVAL; | |
3453 | ret_nodeid = -1; | |
3454 | goto out; | |
3455 | } | |
3456 | ||
3457 | error = dlm_dir_lookup(ls, from_nodeid, ms->m_extra, len, &ret_nodeid); | |
3458 | ||
3459 | /* Optimization: we're master so treat lookup as a request */ | |
3460 | if (!error && ret_nodeid == our_nodeid) { | |
3461 | receive_request(ls, ms); | |
3462 | return; | |
3463 | } | |
3464 | out: | |
3465 | send_lookup_reply(ls, ms, ret_nodeid, error); | |
3466 | } | |
3467 | ||
3468 | static void receive_remove(struct dlm_ls *ls, struct dlm_message *ms) | |
3469 | { | |
3470 | int len, dir_nodeid, from_nodeid; | |
3471 | ||
3472 | from_nodeid = ms->m_header.h_nodeid; | |
3473 | ||
3474 | len = receive_extralen(ms); | |
3475 | ||
3476 | dir_nodeid = dlm_hash2nodeid(ls, ms->m_hash); | |
3477 | if (dir_nodeid != dlm_our_nodeid()) { | |
3478 | log_error(ls, "remove dir entry dir_nodeid %d from %d", | |
3479 | dir_nodeid, from_nodeid); | |
3480 | return; | |
3481 | } | |
3482 | ||
3483 | dlm_dir_remove_entry(ls, from_nodeid, ms->m_extra, len); | |
3484 | } | |
3485 | ||
8499137d DT |
3486 | static void receive_purge(struct dlm_ls *ls, struct dlm_message *ms) |
3487 | { | |
3488 | do_purge(ls, ms->m_nodeid, ms->m_pid); | |
3489 | } | |
3490 | ||
e7fd4179 DT |
3491 | static void receive_request_reply(struct dlm_ls *ls, struct dlm_message *ms) |
3492 | { | |
3493 | struct dlm_lkb *lkb; | |
3494 | struct dlm_rsb *r; | |
ef0c2bb0 | 3495 | int error, mstype, result; |
e7fd4179 DT |
3496 | |
3497 | error = find_lkb(ls, ms->m_remid, &lkb); | |
3498 | if (error) { | |
c54e04b0 DT |
3499 | log_debug(ls, "receive_request_reply from %d no lkb %x", |
3500 | ms->m_header.h_nodeid, ms->m_remid); | |
e7fd4179 DT |
3501 | return; |
3502 | } | |
e7fd4179 | 3503 | |
e7fd4179 DT |
3504 | r = lkb->lkb_resource; |
3505 | hold_rsb(r); | |
3506 | lock_rsb(r); | |
3507 | ||
c54e04b0 DT |
3508 | error = validate_message(lkb, ms); |
3509 | if (error) | |
3510 | goto out; | |
3511 | ||
ef0c2bb0 DT |
3512 | mstype = lkb->lkb_wait_type; |
3513 | error = remove_from_waiters(lkb, DLM_MSG_REQUEST_REPLY); | |
3514 | if (error) | |
3515 | goto out; | |
3516 | ||
e7fd4179 DT |
3517 | /* Optimization: the dir node was also the master, so it took our |
3518 | lookup as a request and sent request reply instead of lookup reply */ | |
3519 | if (mstype == DLM_MSG_LOOKUP) { | |
3520 | r->res_nodeid = ms->m_header.h_nodeid; | |
3521 | lkb->lkb_nodeid = r->res_nodeid; | |
3522 | } | |
3523 | ||
ef0c2bb0 DT |
3524 | /* this is the value returned from do_request() on the master */ |
3525 | result = ms->m_result; | |
3526 | ||
3527 | switch (result) { | |
e7fd4179 | 3528 | case -EAGAIN: |
ef0c2bb0 | 3529 | /* request would block (be queued) on remote master */ |
e7fd4179 DT |
3530 | queue_cast(r, lkb, -EAGAIN); |
3531 | confirm_master(r, -EAGAIN); | |
ef0c2bb0 | 3532 | unhold_lkb(lkb); /* undoes create_lkb() */ |
e7fd4179 DT |
3533 | break; |
3534 | ||
3535 | case -EINPROGRESS: | |
3536 | case 0: | |
3537 | /* request was queued or granted on remote master */ | |
3538 | receive_flags_reply(lkb, ms); | |
3539 | lkb->lkb_remid = ms->m_lkid; | |
7d3c1feb DT |
3540 | if (is_altmode(lkb)) |
3541 | munge_altmode(lkb, ms); | |
3ae1acf9 | 3542 | if (result) { |
e7fd4179 | 3543 | add_lkb(r, lkb, DLM_LKSTS_WAITING); |
3ae1acf9 DT |
3544 | add_timeout(lkb); |
3545 | } else { | |
e7fd4179 DT |
3546 | grant_lock_pc(r, lkb, ms); |
3547 | queue_cast(r, lkb, 0); | |
3548 | } | |
ef0c2bb0 | 3549 | confirm_master(r, result); |
e7fd4179 DT |
3550 | break; |
3551 | ||
597d0cae | 3552 | case -EBADR: |
e7fd4179 DT |
3553 | case -ENOTBLK: |
3554 | /* find_rsb failed to find rsb or rsb wasn't master */ | |
ef0c2bb0 DT |
3555 | log_debug(ls, "receive_request_reply %x %x master diff %d %d", |
3556 | lkb->lkb_id, lkb->lkb_flags, r->res_nodeid, result); | |
e7fd4179 DT |
3557 | r->res_nodeid = -1; |
3558 | lkb->lkb_nodeid = -1; | |
ef0c2bb0 DT |
3559 | |
3560 | if (is_overlap(lkb)) { | |
3561 | /* we'll ignore error in cancel/unlock reply */ | |
3562 | queue_cast_overlap(r, lkb); | |
aec64e1b | 3563 | confirm_master(r, result); |
ef0c2bb0 DT |
3564 | unhold_lkb(lkb); /* undoes create_lkb() */ |
3565 | } else | |
3566 | _request_lock(r, lkb); | |
e7fd4179 DT |
3567 | break; |
3568 | ||
3569 | default: | |
ef0c2bb0 DT |
3570 | log_error(ls, "receive_request_reply %x error %d", |
3571 | lkb->lkb_id, result); | |
e7fd4179 DT |
3572 | } |
3573 | ||
ef0c2bb0 DT |
3574 | if (is_overlap_unlock(lkb) && (result == 0 || result == -EINPROGRESS)) { |
3575 | log_debug(ls, "receive_request_reply %x result %d unlock", | |
3576 | lkb->lkb_id, result); | |
3577 | lkb->lkb_flags &= ~DLM_IFL_OVERLAP_UNLOCK; | |
3578 | lkb->lkb_flags &= ~DLM_IFL_OVERLAP_CANCEL; | |
3579 | send_unlock(r, lkb); | |
3580 | } else if (is_overlap_cancel(lkb) && (result == -EINPROGRESS)) { | |
3581 | log_debug(ls, "receive_request_reply %x cancel", lkb->lkb_id); | |
3582 | lkb->lkb_flags &= ~DLM_IFL_OVERLAP_UNLOCK; | |
3583 | lkb->lkb_flags &= ~DLM_IFL_OVERLAP_CANCEL; | |
3584 | send_cancel(r, lkb); | |
3585 | } else { | |
3586 | lkb->lkb_flags &= ~DLM_IFL_OVERLAP_CANCEL; | |
3587 | lkb->lkb_flags &= ~DLM_IFL_OVERLAP_UNLOCK; | |
3588 | } | |
3589 | out: | |
e7fd4179 DT |
3590 | unlock_rsb(r); |
3591 | put_rsb(r); | |
b3f58d8f | 3592 | dlm_put_lkb(lkb); |
e7fd4179 DT |
3593 | } |
3594 | ||
3595 | static void __receive_convert_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, | |
3596 | struct dlm_message *ms) | |
3597 | { | |
e7fd4179 | 3598 | /* this is the value returned from do_convert() on the master */ |
ef0c2bb0 | 3599 | switch (ms->m_result) { |
e7fd4179 DT |
3600 | case -EAGAIN: |
3601 | /* convert would block (be queued) on remote master */ | |
3602 | queue_cast(r, lkb, -EAGAIN); | |
3603 | break; | |
3604 | ||
c85d65e9 DT |
3605 | case -EDEADLK: |
3606 | receive_flags_reply(lkb, ms); | |
3607 | revert_lock_pc(r, lkb); | |
3608 | queue_cast(r, lkb, -EDEADLK); | |
3609 | break; | |
3610 | ||
e7fd4179 DT |
3611 | case -EINPROGRESS: |
3612 | /* convert was queued on remote master */ | |
7d3c1feb DT |
3613 | receive_flags_reply(lkb, ms); |
3614 | if (is_demoted(lkb)) | |
3615 | munge_demoted(lkb, ms); | |
e7fd4179 DT |
3616 | del_lkb(r, lkb); |
3617 | add_lkb(r, lkb, DLM_LKSTS_CONVERT); | |
3ae1acf9 | 3618 | add_timeout(lkb); |
e7fd4179 DT |
3619 | break; |
3620 | ||
3621 | case 0: | |
3622 | /* convert was granted on remote master */ | |
3623 | receive_flags_reply(lkb, ms); | |
7d3c1feb DT |
3624 | if (is_demoted(lkb)) |
3625 | munge_demoted(lkb, ms); | |
e7fd4179 DT |
3626 | grant_lock_pc(r, lkb, ms); |
3627 | queue_cast(r, lkb, 0); | |
3628 | break; | |
3629 | ||
3630 | default: | |
ef0c2bb0 DT |
3631 | log_error(r->res_ls, "receive_convert_reply %x error %d", |
3632 | lkb->lkb_id, ms->m_result); | |
e7fd4179 DT |
3633 | } |
3634 | } | |
3635 | ||
3636 | static void _receive_convert_reply(struct dlm_lkb *lkb, struct dlm_message *ms) | |
3637 | { | |
3638 | struct dlm_rsb *r = lkb->lkb_resource; | |
ef0c2bb0 | 3639 | int error; |
e7fd4179 DT |
3640 | |
3641 | hold_rsb(r); | |
3642 | lock_rsb(r); | |
3643 | ||
c54e04b0 DT |
3644 | error = validate_message(lkb, ms); |
3645 | if (error) | |
3646 | goto out; | |
3647 | ||
ef0c2bb0 DT |
3648 | /* stub reply can happen with waiters_mutex held */ |
3649 | error = remove_from_waiters_ms(lkb, ms); | |
3650 | if (error) | |
3651 | goto out; | |
e7fd4179 | 3652 | |
ef0c2bb0 DT |
3653 | __receive_convert_reply(r, lkb, ms); |
3654 | out: | |
e7fd4179 DT |
3655 | unlock_rsb(r); |
3656 | put_rsb(r); | |
3657 | } | |
3658 | ||
3659 | static void receive_convert_reply(struct dlm_ls *ls, struct dlm_message *ms) | |
3660 | { | |
3661 | struct dlm_lkb *lkb; | |
3662 | int error; | |
3663 | ||
3664 | error = find_lkb(ls, ms->m_remid, &lkb); | |
3665 | if (error) { | |
c54e04b0 DT |
3666 | log_debug(ls, "receive_convert_reply from %d no lkb %x", |
3667 | ms->m_header.h_nodeid, ms->m_remid); | |
e7fd4179 DT |
3668 | return; |
3669 | } | |
e7fd4179 | 3670 | |
e7fd4179 | 3671 | _receive_convert_reply(lkb, ms); |
b3f58d8f | 3672 | dlm_put_lkb(lkb); |
e7fd4179 DT |
3673 | } |
3674 | ||
3675 | static void _receive_unlock_reply(struct dlm_lkb *lkb, struct dlm_message *ms) | |
3676 | { | |
3677 | struct dlm_rsb *r = lkb->lkb_resource; | |
ef0c2bb0 | 3678 | int error; |
e7fd4179 DT |
3679 | |
3680 | hold_rsb(r); | |
3681 | lock_rsb(r); | |
3682 | ||
c54e04b0 DT |
3683 | error = validate_message(lkb, ms); |
3684 | if (error) | |
3685 | goto out; | |
3686 | ||
ef0c2bb0 DT |
3687 | /* stub reply can happen with waiters_mutex held */ |
3688 | error = remove_from_waiters_ms(lkb, ms); | |
3689 | if (error) | |
3690 | goto out; | |
3691 | ||
e7fd4179 DT |
3692 | /* this is the value returned from do_unlock() on the master */ |
3693 | ||
ef0c2bb0 | 3694 | switch (ms->m_result) { |
e7fd4179 DT |
3695 | case -DLM_EUNLOCK: |
3696 | receive_flags_reply(lkb, ms); | |
3697 | remove_lock_pc(r, lkb); | |
3698 | queue_cast(r, lkb, -DLM_EUNLOCK); | |
3699 | break; | |
ef0c2bb0 DT |
3700 | case -ENOENT: |
3701 | break; | |
e7fd4179 | 3702 | default: |
ef0c2bb0 DT |
3703 | log_error(r->res_ls, "receive_unlock_reply %x error %d", |
3704 | lkb->lkb_id, ms->m_result); | |
e7fd4179 | 3705 | } |
ef0c2bb0 | 3706 | out: |
e7fd4179 DT |
3707 | unlock_rsb(r); |
3708 | put_rsb(r); | |
3709 | } | |
3710 | ||
3711 | static void receive_unlock_reply(struct dlm_ls *ls, struct dlm_message *ms) | |
3712 | { | |
3713 | struct dlm_lkb *lkb; | |
3714 | int error; | |
3715 | ||
3716 | error = find_lkb(ls, ms->m_remid, &lkb); | |
3717 | if (error) { | |
c54e04b0 DT |
3718 | log_debug(ls, "receive_unlock_reply from %d no lkb %x", |
3719 | ms->m_header.h_nodeid, ms->m_remid); | |
e7fd4179 DT |
3720 | return; |
3721 | } | |
e7fd4179 | 3722 | |
e7fd4179 | 3723 | _receive_unlock_reply(lkb, ms); |
b3f58d8f | 3724 | dlm_put_lkb(lkb); |
e7fd4179 DT |
3725 | } |
3726 | ||
3727 | static void _receive_cancel_reply(struct dlm_lkb *lkb, struct dlm_message *ms) | |
3728 | { | |
3729 | struct dlm_rsb *r = lkb->lkb_resource; | |
ef0c2bb0 | 3730 | int error; |
e7fd4179 DT |
3731 | |
3732 | hold_rsb(r); | |
3733 | lock_rsb(r); | |
3734 | ||
c54e04b0 DT |
3735 | error = validate_message(lkb, ms); |
3736 | if (error) | |
3737 | goto out; | |
3738 | ||
ef0c2bb0 DT |
3739 | /* stub reply can happen with waiters_mutex held */ |
3740 | error = remove_from_waiters_ms(lkb, ms); | |
3741 | if (error) | |
3742 | goto out; | |
3743 | ||
e7fd4179 DT |
3744 | /* this is the value returned from do_cancel() on the master */ |
3745 | ||
ef0c2bb0 | 3746 | switch (ms->m_result) { |
e7fd4179 DT |
3747 | case -DLM_ECANCEL: |
3748 | receive_flags_reply(lkb, ms); | |
3749 | revert_lock_pc(r, lkb); | |
84d8cd69 | 3750 | queue_cast(r, lkb, -DLM_ECANCEL); |
ef0c2bb0 DT |
3751 | break; |
3752 | case 0: | |
e7fd4179 DT |
3753 | break; |
3754 | default: | |
ef0c2bb0 DT |
3755 | log_error(r->res_ls, "receive_cancel_reply %x error %d", |
3756 | lkb->lkb_id, ms->m_result); | |
e7fd4179 | 3757 | } |
ef0c2bb0 | 3758 | out: |
e7fd4179 DT |
3759 | unlock_rsb(r); |
3760 | put_rsb(r); | |
3761 | } | |
3762 | ||
3763 | static void receive_cancel_reply(struct dlm_ls *ls, struct dlm_message *ms) | |
3764 | { | |
3765 | struct dlm_lkb *lkb; | |
3766 | int error; | |
3767 | ||
3768 | error = find_lkb(ls, ms->m_remid, &lkb); | |
3769 | if (error) { | |
c54e04b0 DT |
3770 | log_debug(ls, "receive_cancel_reply from %d no lkb %x", |
3771 | ms->m_header.h_nodeid, ms->m_remid); | |
e7fd4179 DT |
3772 | return; |
3773 | } | |
e7fd4179 | 3774 | |
e7fd4179 | 3775 | _receive_cancel_reply(lkb, ms); |
b3f58d8f | 3776 | dlm_put_lkb(lkb); |
e7fd4179 DT |
3777 | } |
3778 | ||
3779 | static void receive_lookup_reply(struct dlm_ls *ls, struct dlm_message *ms) | |
3780 | { | |
3781 | struct dlm_lkb *lkb; | |
3782 | struct dlm_rsb *r; | |
3783 | int error, ret_nodeid; | |
3784 | ||
3785 | error = find_lkb(ls, ms->m_lkid, &lkb); | |
3786 | if (error) { | |
3787 | log_error(ls, "receive_lookup_reply no lkb"); | |
3788 | return; | |
3789 | } | |
3790 | ||
ef0c2bb0 | 3791 | /* ms->m_result is the value returned by dlm_dir_lookup on dir node |
e7fd4179 | 3792 | FIXME: will a non-zero error ever be returned? */ |
e7fd4179 DT |
3793 | |
3794 | r = lkb->lkb_resource; | |
3795 | hold_rsb(r); | |
3796 | lock_rsb(r); | |
3797 | ||
ef0c2bb0 DT |
3798 | error = remove_from_waiters(lkb, DLM_MSG_LOOKUP_REPLY); |
3799 | if (error) | |
3800 | goto out; | |
3801 | ||
e7fd4179 DT |
3802 | ret_nodeid = ms->m_nodeid; |
3803 | if (ret_nodeid == dlm_our_nodeid()) { | |
3804 | r->res_nodeid = 0; | |
3805 | ret_nodeid = 0; | |
3806 | r->res_first_lkid = 0; | |
3807 | } else { | |
3808 | /* set_master() will copy res_nodeid to lkb_nodeid */ | |
3809 | r->res_nodeid = ret_nodeid; | |
3810 | } | |
3811 | ||
ef0c2bb0 DT |
3812 | if (is_overlap(lkb)) { |
3813 | log_debug(ls, "receive_lookup_reply %x unlock %x", | |
3814 | lkb->lkb_id, lkb->lkb_flags); | |
3815 | queue_cast_overlap(r, lkb); | |
3816 | unhold_lkb(lkb); /* undoes create_lkb() */ | |
3817 | goto out_list; | |
3818 | } | |
3819 | ||
e7fd4179 DT |
3820 | _request_lock(r, lkb); |
3821 | ||
ef0c2bb0 | 3822 | out_list: |
e7fd4179 DT |
3823 | if (!ret_nodeid) |
3824 | process_lookup_list(r); | |
ef0c2bb0 | 3825 | out: |
e7fd4179 DT |
3826 | unlock_rsb(r); |
3827 | put_rsb(r); | |
b3f58d8f | 3828 | dlm_put_lkb(lkb); |
e7fd4179 DT |
3829 | } |
3830 | ||
c36258b5 | 3831 | static void _receive_message(struct dlm_ls *ls, struct dlm_message *ms) |
e7fd4179 | 3832 | { |
46b43eed DT |
3833 | if (!dlm_is_member(ls, ms->m_header.h_nodeid)) { |
3834 | log_debug(ls, "ignore non-member message %d from %d %x %x %d", | |
3835 | ms->m_type, ms->m_header.h_nodeid, ms->m_lkid, | |
3836 | ms->m_remid, ms->m_result); | |
3837 | return; | |
3838 | } | |
3839 | ||
e7fd4179 DT |
3840 | switch (ms->m_type) { |
3841 | ||
3842 | /* messages sent to a master node */ | |
3843 | ||
3844 | case DLM_MSG_REQUEST: | |
3845 | receive_request(ls, ms); | |
3846 | break; | |
3847 | ||
3848 | case DLM_MSG_CONVERT: | |
3849 | receive_convert(ls, ms); | |
3850 | break; | |
3851 | ||
3852 | case DLM_MSG_UNLOCK: | |
3853 | receive_unlock(ls, ms); | |
3854 | break; | |
3855 | ||
3856 | case DLM_MSG_CANCEL: | |
3857 | receive_cancel(ls, ms); | |
3858 | break; | |
3859 | ||
3860 | /* messages sent from a master node (replies to above) */ | |
3861 | ||
3862 | case DLM_MSG_REQUEST_REPLY: | |
3863 | receive_request_reply(ls, ms); | |
3864 | break; | |
3865 | ||
3866 | case DLM_MSG_CONVERT_REPLY: | |
3867 | receive_convert_reply(ls, ms); | |
3868 | break; | |
3869 | ||
3870 | case DLM_MSG_UNLOCK_REPLY: | |
3871 | receive_unlock_reply(ls, ms); | |
3872 | break; | |
3873 | ||
3874 | case DLM_MSG_CANCEL_REPLY: | |
3875 | receive_cancel_reply(ls, ms); | |
3876 | break; | |
3877 | ||
3878 | /* messages sent from a master node (only two types of async msg) */ | |
3879 | ||
3880 | case DLM_MSG_GRANT: | |
3881 | receive_grant(ls, ms); | |
3882 | break; | |
3883 | ||
3884 | case DLM_MSG_BAST: | |
3885 | receive_bast(ls, ms); | |
3886 | break; | |
3887 | ||
3888 | /* messages sent to a dir node */ | |
3889 | ||
3890 | case DLM_MSG_LOOKUP: | |
3891 | receive_lookup(ls, ms); | |
3892 | break; | |
3893 | ||
3894 | case DLM_MSG_REMOVE: | |
3895 | receive_remove(ls, ms); | |
3896 | break; | |
3897 | ||
3898 | /* messages sent from a dir node (remove has no reply) */ | |
3899 | ||
3900 | case DLM_MSG_LOOKUP_REPLY: | |
3901 | receive_lookup_reply(ls, ms); | |
3902 | break; | |
3903 | ||
8499137d DT |
3904 | /* other messages */ |
3905 | ||
3906 | case DLM_MSG_PURGE: | |
3907 | receive_purge(ls, ms); | |
3908 | break; | |
3909 | ||
e7fd4179 DT |
3910 | default: |
3911 | log_error(ls, "unknown message type %d", ms->m_type); | |
3912 | } | |
3913 | ||
e7fd4179 | 3914 | dlm_astd_wake(); |
e7fd4179 DT |
3915 | } |
3916 | ||
c36258b5 DT |
3917 | /* If the lockspace is in recovery mode (locking stopped), then normal |
3918 | messages are saved on the requestqueue for processing after recovery is | |
3919 | done. When not in recovery mode, we wait for dlm_recoverd to drain saved | |
3920 | messages off the requestqueue before we process new ones. This occurs right | |
3921 | after recovery completes when we transition from saving all messages on | |
3922 | requestqueue, to processing all the saved messages, to processing new | |
3923 | messages as they arrive. */ | |
e7fd4179 | 3924 | |
c36258b5 DT |
3925 | static void dlm_receive_message(struct dlm_ls *ls, struct dlm_message *ms, |
3926 | int nodeid) | |
3927 | { | |
3928 | if (dlm_locking_stopped(ls)) { | |
8b0d8e03 | 3929 | dlm_add_requestqueue(ls, nodeid, ms); |
c36258b5 DT |
3930 | } else { |
3931 | dlm_wait_requestqueue(ls); | |
3932 | _receive_message(ls, ms); | |
3933 | } | |
3934 | } | |
3935 | ||
3936 | /* This is called by dlm_recoverd to process messages that were saved on | |
3937 | the requestqueue. */ | |
3938 | ||
3939 | void dlm_receive_message_saved(struct dlm_ls *ls, struct dlm_message *ms) | |
3940 | { | |
3941 | _receive_message(ls, ms); | |
3942 | } | |
3943 | ||
3944 | /* This is called by the midcomms layer when something is received for | |
3945 | the lockspace. It could be either a MSG (normal message sent as part of | |
3946 | standard locking activity) or an RCOM (recovery message sent as part of | |
3947 | lockspace recovery). */ | |
3948 | ||
eef7d739 | 3949 | void dlm_receive_buffer(union dlm_packet *p, int nodeid) |
c36258b5 | 3950 | { |
eef7d739 | 3951 | struct dlm_header *hd = &p->header; |
c36258b5 DT |
3952 | struct dlm_ls *ls; |
3953 | int type = 0; | |
3954 | ||
3955 | switch (hd->h_cmd) { | |
3956 | case DLM_MSG: | |
eef7d739 AV |
3957 | dlm_message_in(&p->message); |
3958 | type = p->message.m_type; | |
c36258b5 DT |
3959 | break; |
3960 | case DLM_RCOM: | |
eef7d739 AV |
3961 | dlm_rcom_in(&p->rcom); |
3962 | type = p->rcom.rc_type; | |
c36258b5 DT |
3963 | break; |
3964 | default: | |
3965 | log_print("invalid h_cmd %d from %u", hd->h_cmd, nodeid); | |
3966 | return; | |
3967 | } | |
3968 | ||
3969 | if (hd->h_nodeid != nodeid) { | |
3970 | log_print("invalid h_nodeid %d from %d lockspace %x", | |
3971 | hd->h_nodeid, nodeid, hd->h_lockspace); | |
3972 | return; | |
3973 | } | |
3974 | ||
3975 | ls = dlm_find_lockspace_global(hd->h_lockspace); | |
3976 | if (!ls) { | |
594199eb DT |
3977 | if (dlm_config.ci_log_debug) |
3978 | log_print("invalid lockspace %x from %d cmd %d type %d", | |
3979 | hd->h_lockspace, nodeid, hd->h_cmd, type); | |
c36258b5 DT |
3980 | |
3981 | if (hd->h_cmd == DLM_RCOM && type == DLM_RCOM_STATUS) | |
eef7d739 | 3982 | dlm_send_ls_not_ready(nodeid, &p->rcom); |
c36258b5 DT |
3983 | return; |
3984 | } | |
3985 | ||
3986 | /* this rwsem allows dlm_ls_stop() to wait for all dlm_recv threads to | |
3987 | be inactive (in this ls) before transitioning to recovery mode */ | |
3988 | ||
3989 | down_read(&ls->ls_recv_active); | |
3990 | if (hd->h_cmd == DLM_MSG) | |
eef7d739 | 3991 | dlm_receive_message(ls, &p->message, nodeid); |
c36258b5 | 3992 | else |
eef7d739 | 3993 | dlm_receive_rcom(ls, &p->rcom, nodeid); |
c36258b5 DT |
3994 | up_read(&ls->ls_recv_active); |
3995 | ||
3996 | dlm_put_lockspace(ls); | |
3997 | } | |
e7fd4179 DT |
3998 | |
3999 | static void recover_convert_waiter(struct dlm_ls *ls, struct dlm_lkb *lkb) | |
4000 | { | |
4001 | if (middle_conversion(lkb)) { | |
4002 | hold_lkb(lkb); | |
ef0c2bb0 | 4003 | ls->ls_stub_ms.m_type = DLM_MSG_CONVERT_REPLY; |
e7fd4179 | 4004 | ls->ls_stub_ms.m_result = -EINPROGRESS; |
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 DT |
4007 | _receive_convert_reply(lkb, &ls->ls_stub_ms); |
4008 | ||
4009 | /* Same special case as in receive_rcom_lock_args() */ | |
4010 | lkb->lkb_grmode = DLM_LOCK_IV; | |
4011 | rsb_set_flag(lkb->lkb_resource, RSB_RECOVER_CONVERT); | |
4012 | unhold_lkb(lkb); | |
4013 | ||
4014 | } else if (lkb->lkb_rqmode >= lkb->lkb_grmode) { | |
4015 | lkb->lkb_flags |= DLM_IFL_RESEND; | |
4016 | } | |
4017 | ||
4018 | /* lkb->lkb_rqmode < lkb->lkb_grmode shouldn't happen since down | |
4019 | conversions are async; there's no reply from the remote master */ | |
4020 | } | |
4021 | ||
4022 | /* A waiting lkb needs recovery if the master node has failed, or | |
4023 | the master node is changing (only when no directory is used) */ | |
4024 | ||
4025 | static int waiter_needs_recovery(struct dlm_ls *ls, struct dlm_lkb *lkb) | |
4026 | { | |
4027 | if (dlm_is_removed(ls, lkb->lkb_nodeid)) | |
4028 | return 1; | |
4029 | ||
4030 | if (!dlm_no_directory(ls)) | |
4031 | return 0; | |
4032 | ||
4033 | if (dlm_dir_nodeid(lkb->lkb_resource) != lkb->lkb_nodeid) | |
4034 | return 1; | |
4035 | ||
4036 | return 0; | |
4037 | } | |
4038 | ||
4039 | /* Recovery for locks that are waiting for replies from nodes that are now | |
4040 | gone. We can just complete unlocks and cancels by faking a reply from the | |
4041 | dead node. Requests and up-conversions we flag to be resent after | |
4042 | recovery. Down-conversions can just be completed with a fake reply like | |
4043 | unlocks. Conversions between PR and CW need special attention. */ | |
4044 | ||
4045 | void dlm_recover_waiters_pre(struct dlm_ls *ls) | |
4046 | { | |
4047 | struct dlm_lkb *lkb, *safe; | |
601342ce | 4048 | int wait_type, stub_unlock_result, stub_cancel_result; |
e7fd4179 | 4049 | |
90135925 | 4050 | mutex_lock(&ls->ls_waiters_mutex); |
e7fd4179 DT |
4051 | |
4052 | list_for_each_entry_safe(lkb, safe, &ls->ls_waiters, lkb_wait_reply) { | |
4053 | log_debug(ls, "pre recover waiter lkid %x type %d flags %x", | |
4054 | lkb->lkb_id, lkb->lkb_wait_type, lkb->lkb_flags); | |
4055 | ||
4056 | /* all outstanding lookups, regardless of destination will be | |
4057 | resent after recovery is done */ | |
4058 | ||
4059 | if (lkb->lkb_wait_type == DLM_MSG_LOOKUP) { | |
4060 | lkb->lkb_flags |= DLM_IFL_RESEND; | |
4061 | continue; | |
4062 | } | |
4063 | ||
4064 | if (!waiter_needs_recovery(ls, lkb)) | |
4065 | continue; | |
4066 | ||
601342ce DT |
4067 | wait_type = lkb->lkb_wait_type; |
4068 | stub_unlock_result = -DLM_EUNLOCK; | |
4069 | stub_cancel_result = -DLM_ECANCEL; | |
4070 | ||
4071 | /* Main reply may have been received leaving a zero wait_type, | |
4072 | but a reply for the overlapping op may not have been | |
4073 | received. In that case we need to fake the appropriate | |
4074 | reply for the overlap op. */ | |
4075 | ||
4076 | if (!wait_type) { | |
4077 | if (is_overlap_cancel(lkb)) { | |
4078 | wait_type = DLM_MSG_CANCEL; | |
4079 | if (lkb->lkb_grmode == DLM_LOCK_IV) | |
4080 | stub_cancel_result = 0; | |
4081 | } | |
4082 | if (is_overlap_unlock(lkb)) { | |
4083 | wait_type = DLM_MSG_UNLOCK; | |
4084 | if (lkb->lkb_grmode == DLM_LOCK_IV) | |
4085 | stub_unlock_result = -ENOENT; | |
4086 | } | |
4087 | ||
4088 | log_debug(ls, "rwpre overlap %x %x %d %d %d", | |
4089 | lkb->lkb_id, lkb->lkb_flags, wait_type, | |
4090 | stub_cancel_result, stub_unlock_result); | |
4091 | } | |
4092 | ||
4093 | switch (wait_type) { | |
e7fd4179 DT |
4094 | |
4095 | case DLM_MSG_REQUEST: | |
4096 | lkb->lkb_flags |= DLM_IFL_RESEND; | |
4097 | break; | |
4098 | ||
4099 | case DLM_MSG_CONVERT: | |
4100 | recover_convert_waiter(ls, lkb); | |
4101 | break; | |
4102 | ||
4103 | case DLM_MSG_UNLOCK: | |
4104 | hold_lkb(lkb); | |
ef0c2bb0 | 4105 | ls->ls_stub_ms.m_type = DLM_MSG_UNLOCK_REPLY; |
601342ce | 4106 | ls->ls_stub_ms.m_result = stub_unlock_result; |
075529b5 | 4107 | ls->ls_stub_ms.m_flags = lkb->lkb_flags; |
c54e04b0 | 4108 | ls->ls_stub_ms.m_header.h_nodeid = lkb->lkb_nodeid; |
e7fd4179 | 4109 | _receive_unlock_reply(lkb, &ls->ls_stub_ms); |
b3f58d8f | 4110 | dlm_put_lkb(lkb); |
e7fd4179 DT |
4111 | break; |
4112 | ||
4113 | case DLM_MSG_CANCEL: | |
4114 | hold_lkb(lkb); | |
ef0c2bb0 | 4115 | ls->ls_stub_ms.m_type = DLM_MSG_CANCEL_REPLY; |
601342ce | 4116 | ls->ls_stub_ms.m_result = stub_cancel_result; |
075529b5 | 4117 | ls->ls_stub_ms.m_flags = lkb->lkb_flags; |
c54e04b0 | 4118 | ls->ls_stub_ms.m_header.h_nodeid = lkb->lkb_nodeid; |
e7fd4179 | 4119 | _receive_cancel_reply(lkb, &ls->ls_stub_ms); |
b3f58d8f | 4120 | dlm_put_lkb(lkb); |
e7fd4179 DT |
4121 | break; |
4122 | ||
4123 | default: | |
601342ce DT |
4124 | log_error(ls, "invalid lkb wait_type %d %d", |
4125 | lkb->lkb_wait_type, wait_type); | |
e7fd4179 | 4126 | } |
81456807 | 4127 | schedule(); |
e7fd4179 | 4128 | } |
90135925 | 4129 | mutex_unlock(&ls->ls_waiters_mutex); |
e7fd4179 DT |
4130 | } |
4131 | ||
ef0c2bb0 | 4132 | static struct dlm_lkb *find_resend_waiter(struct dlm_ls *ls) |
e7fd4179 DT |
4133 | { |
4134 | struct dlm_lkb *lkb; | |
ef0c2bb0 | 4135 | int found = 0; |
e7fd4179 | 4136 | |
90135925 | 4137 | mutex_lock(&ls->ls_waiters_mutex); |
e7fd4179 DT |
4138 | list_for_each_entry(lkb, &ls->ls_waiters, lkb_wait_reply) { |
4139 | if (lkb->lkb_flags & DLM_IFL_RESEND) { | |
ef0c2bb0 DT |
4140 | hold_lkb(lkb); |
4141 | found = 1; | |
e7fd4179 DT |
4142 | break; |
4143 | } | |
4144 | } | |
90135925 | 4145 | mutex_unlock(&ls->ls_waiters_mutex); |
e7fd4179 | 4146 | |
ef0c2bb0 | 4147 | if (!found) |
e7fd4179 | 4148 | lkb = NULL; |
ef0c2bb0 | 4149 | return lkb; |
e7fd4179 DT |
4150 | } |
4151 | ||
4152 | /* Deal with lookups and lkb's marked RESEND from _pre. We may now be the | |
4153 | master or dir-node for r. Processing the lkb may result in it being placed | |
4154 | back on waiters. */ | |
4155 | ||
ef0c2bb0 DT |
4156 | /* We do this after normal locking has been enabled and any saved messages |
4157 | (in requestqueue) have been processed. We should be confident that at | |
4158 | this point we won't get or process a reply to any of these waiting | |
4159 | operations. But, new ops may be coming in on the rsbs/locks here from | |
4160 | userspace or remotely. */ | |
4161 | ||
4162 | /* there may have been an overlap unlock/cancel prior to recovery or after | |
4163 | recovery. if before, the lkb may still have a pos wait_count; if after, the | |
4164 | overlap flag would just have been set and nothing new sent. we can be | |
4165 | confident here than any replies to either the initial op or overlap ops | |
4166 | prior to recovery have been received. */ | |
4167 | ||
e7fd4179 DT |
4168 | int dlm_recover_waiters_post(struct dlm_ls *ls) |
4169 | { | |
4170 | struct dlm_lkb *lkb; | |
4171 | struct dlm_rsb *r; | |
ef0c2bb0 | 4172 | int error = 0, mstype, err, oc, ou; |
e7fd4179 DT |
4173 | |
4174 | while (1) { | |
4175 | if (dlm_locking_stopped(ls)) { | |
4176 | log_debug(ls, "recover_waiters_post aborted"); | |
4177 | error = -EINTR; | |
4178 | break; | |
4179 | } | |
4180 | ||
ef0c2bb0 DT |
4181 | lkb = find_resend_waiter(ls); |
4182 | if (!lkb) | |
e7fd4179 DT |
4183 | break; |
4184 | ||
4185 | r = lkb->lkb_resource; | |
ef0c2bb0 DT |
4186 | hold_rsb(r); |
4187 | lock_rsb(r); | |
4188 | ||
4189 | mstype = lkb->lkb_wait_type; | |
4190 | oc = is_overlap_cancel(lkb); | |
4191 | ou = is_overlap_unlock(lkb); | |
4192 | err = 0; | |
e7fd4179 DT |
4193 | |
4194 | log_debug(ls, "recover_waiters_post %x type %d flags %x %s", | |
4195 | lkb->lkb_id, mstype, lkb->lkb_flags, r->res_name); | |
4196 | ||
ef0c2bb0 DT |
4197 | /* At this point we assume that we won't get a reply to any |
4198 | previous op or overlap op on this lock. First, do a big | |
4199 | remove_from_waiters() for all previous ops. */ | |
4200 | ||
4201 | lkb->lkb_flags &= ~DLM_IFL_RESEND; | |
4202 | lkb->lkb_flags &= ~DLM_IFL_OVERLAP_UNLOCK; | |
4203 | lkb->lkb_flags &= ~DLM_IFL_OVERLAP_CANCEL; | |
4204 | lkb->lkb_wait_type = 0; | |
4205 | lkb->lkb_wait_count = 0; | |
4206 | mutex_lock(&ls->ls_waiters_mutex); | |
4207 | list_del_init(&lkb->lkb_wait_reply); | |
4208 | mutex_unlock(&ls->ls_waiters_mutex); | |
4209 | unhold_lkb(lkb); /* for waiters list */ | |
4210 | ||
4211 | if (oc || ou) { | |
4212 | /* do an unlock or cancel instead of resending */ | |
4213 | switch (mstype) { | |
4214 | case DLM_MSG_LOOKUP: | |
4215 | case DLM_MSG_REQUEST: | |
4216 | queue_cast(r, lkb, ou ? -DLM_EUNLOCK : | |
4217 | -DLM_ECANCEL); | |
4218 | unhold_lkb(lkb); /* undoes create_lkb() */ | |
4219 | break; | |
4220 | case DLM_MSG_CONVERT: | |
4221 | if (oc) { | |
4222 | queue_cast(r, lkb, -DLM_ECANCEL); | |
4223 | } else { | |
4224 | lkb->lkb_exflags |= DLM_LKF_FORCEUNLOCK; | |
4225 | _unlock_lock(r, lkb); | |
4226 | } | |
4227 | break; | |
4228 | default: | |
4229 | err = 1; | |
4230 | } | |
4231 | } else { | |
4232 | switch (mstype) { | |
4233 | case DLM_MSG_LOOKUP: | |
4234 | case DLM_MSG_REQUEST: | |
4235 | _request_lock(r, lkb); | |
4236 | if (is_master(r)) | |
4237 | confirm_master(r, 0); | |
4238 | break; | |
4239 | case DLM_MSG_CONVERT: | |
4240 | _convert_lock(r, lkb); | |
4241 | break; | |
4242 | default: | |
4243 | err = 1; | |
4244 | } | |
e7fd4179 | 4245 | } |
ef0c2bb0 DT |
4246 | |
4247 | if (err) | |
4248 | log_error(ls, "recover_waiters_post %x %d %x %d %d", | |
4249 | lkb->lkb_id, mstype, lkb->lkb_flags, oc, ou); | |
4250 | unlock_rsb(r); | |
4251 | put_rsb(r); | |
4252 | dlm_put_lkb(lkb); | |
e7fd4179 DT |
4253 | } |
4254 | ||
4255 | return error; | |
4256 | } | |
4257 | ||
4258 | static void purge_queue(struct dlm_rsb *r, struct list_head *queue, | |
4259 | int (*test)(struct dlm_ls *ls, struct dlm_lkb *lkb)) | |
4260 | { | |
4261 | struct dlm_ls *ls = r->res_ls; | |
4262 | struct dlm_lkb *lkb, *safe; | |
4263 | ||
4264 | list_for_each_entry_safe(lkb, safe, queue, lkb_statequeue) { | |
4265 | if (test(ls, lkb)) { | |
97a35d1e | 4266 | rsb_set_flag(r, RSB_LOCKS_PURGED); |
e7fd4179 DT |
4267 | del_lkb(r, lkb); |
4268 | /* this put should free the lkb */ | |
b3f58d8f | 4269 | if (!dlm_put_lkb(lkb)) |
e7fd4179 DT |
4270 | log_error(ls, "purged lkb not released"); |
4271 | } | |
4272 | } | |
4273 | } | |
4274 | ||
4275 | static int purge_dead_test(struct dlm_ls *ls, struct dlm_lkb *lkb) | |
4276 | { | |
4277 | return (is_master_copy(lkb) && dlm_is_removed(ls, lkb->lkb_nodeid)); | |
4278 | } | |
4279 | ||
4280 | static int purge_mstcpy_test(struct dlm_ls *ls, struct dlm_lkb *lkb) | |
4281 | { | |
4282 | return is_master_copy(lkb); | |
4283 | } | |
4284 | ||
4285 | static void purge_dead_locks(struct dlm_rsb *r) | |
4286 | { | |
4287 | purge_queue(r, &r->res_grantqueue, &purge_dead_test); | |
4288 | purge_queue(r, &r->res_convertqueue, &purge_dead_test); | |
4289 | purge_queue(r, &r->res_waitqueue, &purge_dead_test); | |
4290 | } | |
4291 | ||
4292 | void dlm_purge_mstcpy_locks(struct dlm_rsb *r) | |
4293 | { | |
4294 | purge_queue(r, &r->res_grantqueue, &purge_mstcpy_test); | |
4295 | purge_queue(r, &r->res_convertqueue, &purge_mstcpy_test); | |
4296 | purge_queue(r, &r->res_waitqueue, &purge_mstcpy_test); | |
4297 | } | |
4298 | ||
4299 | /* Get rid of locks held by nodes that are gone. */ | |
4300 | ||
4301 | int dlm_purge_locks(struct dlm_ls *ls) | |
4302 | { | |
4303 | struct dlm_rsb *r; | |
4304 | ||
4305 | log_debug(ls, "dlm_purge_locks"); | |
4306 | ||
4307 | down_write(&ls->ls_root_sem); | |
4308 | list_for_each_entry(r, &ls->ls_root_list, res_root_list) { | |
4309 | hold_rsb(r); | |
4310 | lock_rsb(r); | |
4311 | if (is_master(r)) | |
4312 | purge_dead_locks(r); | |
4313 | unlock_rsb(r); | |
4314 | unhold_rsb(r); | |
4315 | ||
4316 | schedule(); | |
4317 | } | |
4318 | up_write(&ls->ls_root_sem); | |
4319 | ||
4320 | return 0; | |
4321 | } | |
4322 | ||
97a35d1e DT |
4323 | static struct dlm_rsb *find_purged_rsb(struct dlm_ls *ls, int bucket) |
4324 | { | |
4325 | struct dlm_rsb *r, *r_ret = NULL; | |
4326 | ||
c7be761a | 4327 | spin_lock(&ls->ls_rsbtbl[bucket].lock); |
97a35d1e DT |
4328 | list_for_each_entry(r, &ls->ls_rsbtbl[bucket].list, res_hashchain) { |
4329 | if (!rsb_flag(r, RSB_LOCKS_PURGED)) | |
4330 | continue; | |
4331 | hold_rsb(r); | |
4332 | rsb_clear_flag(r, RSB_LOCKS_PURGED); | |
4333 | r_ret = r; | |
4334 | break; | |
4335 | } | |
c7be761a | 4336 | spin_unlock(&ls->ls_rsbtbl[bucket].lock); |
97a35d1e DT |
4337 | return r_ret; |
4338 | } | |
4339 | ||
4340 | void dlm_grant_after_purge(struct dlm_ls *ls) | |
e7fd4179 DT |
4341 | { |
4342 | struct dlm_rsb *r; | |
2b4e926a | 4343 | int bucket = 0; |
e7fd4179 | 4344 | |
2b4e926a DT |
4345 | while (1) { |
4346 | r = find_purged_rsb(ls, bucket); | |
4347 | if (!r) { | |
4348 | if (bucket == ls->ls_rsbtbl_size - 1) | |
4349 | break; | |
4350 | bucket++; | |
97a35d1e | 4351 | continue; |
2b4e926a | 4352 | } |
97a35d1e DT |
4353 | lock_rsb(r); |
4354 | if (is_master(r)) { | |
4355 | grant_pending_locks(r); | |
4356 | confirm_master(r, 0); | |
e7fd4179 | 4357 | } |
97a35d1e DT |
4358 | unlock_rsb(r); |
4359 | put_rsb(r); | |
2b4e926a | 4360 | schedule(); |
e7fd4179 | 4361 | } |
e7fd4179 DT |
4362 | } |
4363 | ||
4364 | static struct dlm_lkb *search_remid_list(struct list_head *head, int nodeid, | |
4365 | uint32_t remid) | |
4366 | { | |
4367 | struct dlm_lkb *lkb; | |
4368 | ||
4369 | list_for_each_entry(lkb, head, lkb_statequeue) { | |
4370 | if (lkb->lkb_nodeid == nodeid && lkb->lkb_remid == remid) | |
4371 | return lkb; | |
4372 | } | |
4373 | return NULL; | |
4374 | } | |
4375 | ||
4376 | static struct dlm_lkb *search_remid(struct dlm_rsb *r, int nodeid, | |
4377 | uint32_t remid) | |
4378 | { | |
4379 | struct dlm_lkb *lkb; | |
4380 | ||
4381 | lkb = search_remid_list(&r->res_grantqueue, nodeid, remid); | |
4382 | if (lkb) | |
4383 | return lkb; | |
4384 | lkb = search_remid_list(&r->res_convertqueue, nodeid, remid); | |
4385 | if (lkb) | |
4386 | return lkb; | |
4387 | lkb = search_remid_list(&r->res_waitqueue, nodeid, remid); | |
4388 | if (lkb) | |
4389 | return lkb; | |
4390 | return NULL; | |
4391 | } | |
4392 | ||
ae773d0b | 4393 | /* needs at least dlm_rcom + rcom_lock */ |
e7fd4179 DT |
4394 | static int receive_rcom_lock_args(struct dlm_ls *ls, struct dlm_lkb *lkb, |
4395 | struct dlm_rsb *r, struct dlm_rcom *rc) | |
4396 | { | |
4397 | struct rcom_lock *rl = (struct rcom_lock *) rc->rc_buf; | |
e7fd4179 DT |
4398 | |
4399 | lkb->lkb_nodeid = rc->rc_header.h_nodeid; | |
163a1859 AV |
4400 | lkb->lkb_ownpid = le32_to_cpu(rl->rl_ownpid); |
4401 | lkb->lkb_remid = le32_to_cpu(rl->rl_lkid); | |
4402 | lkb->lkb_exflags = le32_to_cpu(rl->rl_exflags); | |
4403 | lkb->lkb_flags = le32_to_cpu(rl->rl_flags) & 0x0000FFFF; | |
e7fd4179 | 4404 | lkb->lkb_flags |= DLM_IFL_MSTCPY; |
163a1859 | 4405 | lkb->lkb_lvbseq = le32_to_cpu(rl->rl_lvbseq); |
e7fd4179 DT |
4406 | lkb->lkb_rqmode = rl->rl_rqmode; |
4407 | lkb->lkb_grmode = rl->rl_grmode; | |
4408 | /* don't set lkb_status because add_lkb wants to itself */ | |
4409 | ||
8304d6f2 DT |
4410 | lkb->lkb_bastfn = (rl->rl_asts & DLM_CB_BAST) ? &fake_bastfn : NULL; |
4411 | lkb->lkb_astfn = (rl->rl_asts & DLM_CB_CAST) ? &fake_astfn : NULL; | |
e7fd4179 | 4412 | |
e7fd4179 | 4413 | if (lkb->lkb_exflags & DLM_LKF_VALBLK) { |
a5dd0631 AV |
4414 | int lvblen = rc->rc_header.h_length - sizeof(struct dlm_rcom) - |
4415 | sizeof(struct rcom_lock); | |
4416 | if (lvblen > ls->ls_lvblen) | |
4417 | return -EINVAL; | |
52bda2b5 | 4418 | lkb->lkb_lvbptr = dlm_allocate_lvb(ls); |
e7fd4179 DT |
4419 | if (!lkb->lkb_lvbptr) |
4420 | return -ENOMEM; | |
e7fd4179 DT |
4421 | memcpy(lkb->lkb_lvbptr, rl->rl_lvb, lvblen); |
4422 | } | |
4423 | ||
4424 | /* Conversions between PR and CW (middle modes) need special handling. | |
4425 | The real granted mode of these converting locks cannot be determined | |
4426 | until all locks have been rebuilt on the rsb (recover_conversion) */ | |
4427 | ||
163a1859 AV |
4428 | if (rl->rl_wait_type == cpu_to_le16(DLM_MSG_CONVERT) && |
4429 | middle_conversion(lkb)) { | |
e7fd4179 DT |
4430 | rl->rl_status = DLM_LKSTS_CONVERT; |
4431 | lkb->lkb_grmode = DLM_LOCK_IV; | |
4432 | rsb_set_flag(r, RSB_RECOVER_CONVERT); | |
4433 | } | |
4434 | ||
4435 | return 0; | |
4436 | } | |
4437 | ||
4438 | /* This lkb may have been recovered in a previous aborted recovery so we need | |
4439 | to check if the rsb already has an lkb with the given remote nodeid/lkid. | |
4440 | If so we just send back a standard reply. If not, we create a new lkb with | |
4441 | the given values and send back our lkid. We send back our lkid by sending | |
4442 | back the rcom_lock struct we got but with the remid field filled in. */ | |
4443 | ||
ae773d0b | 4444 | /* needs at least dlm_rcom + rcom_lock */ |
e7fd4179 DT |
4445 | int dlm_recover_master_copy(struct dlm_ls *ls, struct dlm_rcom *rc) |
4446 | { | |
4447 | struct rcom_lock *rl = (struct rcom_lock *) rc->rc_buf; | |
4448 | struct dlm_rsb *r; | |
4449 | struct dlm_lkb *lkb; | |
4450 | int error; | |
4451 | ||
4452 | if (rl->rl_parent_lkid) { | |
4453 | error = -EOPNOTSUPP; | |
4454 | goto out; | |
4455 | } | |
4456 | ||
163a1859 AV |
4457 | error = find_rsb(ls, rl->rl_name, le16_to_cpu(rl->rl_namelen), |
4458 | R_MASTER, &r); | |
e7fd4179 DT |
4459 | if (error) |
4460 | goto out; | |
4461 | ||
4462 | lock_rsb(r); | |
4463 | ||
163a1859 | 4464 | lkb = search_remid(r, rc->rc_header.h_nodeid, le32_to_cpu(rl->rl_lkid)); |
e7fd4179 DT |
4465 | if (lkb) { |
4466 | error = -EEXIST; | |
4467 | goto out_remid; | |
4468 | } | |
4469 | ||
4470 | error = create_lkb(ls, &lkb); | |
4471 | if (error) | |
4472 | goto out_unlock; | |
4473 | ||
4474 | error = receive_rcom_lock_args(ls, lkb, r, rc); | |
4475 | if (error) { | |
b3f58d8f | 4476 | __put_lkb(ls, lkb); |
e7fd4179 DT |
4477 | goto out_unlock; |
4478 | } | |
4479 | ||
4480 | attach_lkb(r, lkb); | |
4481 | add_lkb(r, lkb, rl->rl_status); | |
4482 | error = 0; | |
4483 | ||
4484 | out_remid: | |
4485 | /* this is the new value returned to the lock holder for | |
4486 | saving in its process-copy lkb */ | |
163a1859 | 4487 | rl->rl_remid = cpu_to_le32(lkb->lkb_id); |
e7fd4179 DT |
4488 | |
4489 | out_unlock: | |
4490 | unlock_rsb(r); | |
4491 | put_rsb(r); | |
4492 | out: | |
4493 | if (error) | |
163a1859 AV |
4494 | log_debug(ls, "recover_master_copy %d %x", error, |
4495 | le32_to_cpu(rl->rl_lkid)); | |
4496 | rl->rl_result = cpu_to_le32(error); | |
e7fd4179 DT |
4497 | return error; |
4498 | } | |
4499 | ||
ae773d0b | 4500 | /* needs at least dlm_rcom + rcom_lock */ |
e7fd4179 DT |
4501 | int dlm_recover_process_copy(struct dlm_ls *ls, struct dlm_rcom *rc) |
4502 | { | |
4503 | struct rcom_lock *rl = (struct rcom_lock *) rc->rc_buf; | |
4504 | struct dlm_rsb *r; | |
4505 | struct dlm_lkb *lkb; | |
4506 | int error; | |
4507 | ||
163a1859 | 4508 | error = find_lkb(ls, le32_to_cpu(rl->rl_lkid), &lkb); |
e7fd4179 | 4509 | if (error) { |
163a1859 AV |
4510 | log_error(ls, "recover_process_copy no lkid %x", |
4511 | le32_to_cpu(rl->rl_lkid)); | |
e7fd4179 DT |
4512 | return error; |
4513 | } | |
4514 | ||
4515 | DLM_ASSERT(is_process_copy(lkb), dlm_print_lkb(lkb);); | |
4516 | ||
163a1859 | 4517 | error = le32_to_cpu(rl->rl_result); |
e7fd4179 DT |
4518 | |
4519 | r = lkb->lkb_resource; | |
4520 | hold_rsb(r); | |
4521 | lock_rsb(r); | |
4522 | ||
4523 | switch (error) { | |
dc200a88 DT |
4524 | case -EBADR: |
4525 | /* There's a chance the new master received our lock before | |
4526 | dlm_recover_master_reply(), this wouldn't happen if we did | |
4527 | a barrier between recover_masters and recover_locks. */ | |
4528 | log_debug(ls, "master copy not ready %x r %lx %s", lkb->lkb_id, | |
4529 | (unsigned long)r, r->res_name); | |
4530 | dlm_send_rcom_lock(r, lkb); | |
4531 | goto out; | |
e7fd4179 DT |
4532 | case -EEXIST: |
4533 | log_debug(ls, "master copy exists %x", lkb->lkb_id); | |
4534 | /* fall through */ | |
4535 | case 0: | |
163a1859 | 4536 | lkb->lkb_remid = le32_to_cpu(rl->rl_remid); |
e7fd4179 DT |
4537 | break; |
4538 | default: | |
4539 | log_error(ls, "dlm_recover_process_copy unknown error %d %x", | |
4540 | error, lkb->lkb_id); | |
4541 | } | |
4542 | ||
4543 | /* an ack for dlm_recover_locks() which waits for replies from | |
4544 | all the locks it sends to new masters */ | |
4545 | dlm_recovered_lock(r); | |
dc200a88 | 4546 | out: |
e7fd4179 DT |
4547 | unlock_rsb(r); |
4548 | put_rsb(r); | |
b3f58d8f | 4549 | dlm_put_lkb(lkb); |
e7fd4179 DT |
4550 | |
4551 | return 0; | |
4552 | } | |
4553 | ||
597d0cae DT |
4554 | int dlm_user_request(struct dlm_ls *ls, struct dlm_user_args *ua, |
4555 | int mode, uint32_t flags, void *name, unsigned int namelen, | |
d7db923e | 4556 | unsigned long timeout_cs) |
597d0cae DT |
4557 | { |
4558 | struct dlm_lkb *lkb; | |
4559 | struct dlm_args args; | |
4560 | int error; | |
4561 | ||
85e86edf | 4562 | dlm_lock_recovery(ls); |
597d0cae DT |
4563 | |
4564 | error = create_lkb(ls, &lkb); | |
4565 | if (error) { | |
4566 | kfree(ua); | |
4567 | goto out; | |
4568 | } | |
4569 | ||
4570 | if (flags & DLM_LKF_VALBLK) { | |
573c24c4 | 4571 | ua->lksb.sb_lvbptr = kzalloc(DLM_USER_LVB_LEN, GFP_NOFS); |
597d0cae DT |
4572 | if (!ua->lksb.sb_lvbptr) { |
4573 | kfree(ua); | |
4574 | __put_lkb(ls, lkb); | |
4575 | error = -ENOMEM; | |
4576 | goto out; | |
4577 | } | |
4578 | } | |
4579 | ||
52bda2b5 | 4580 | /* After ua is attached to lkb it will be freed by dlm_free_lkb(). |
597d0cae DT |
4581 | When DLM_IFL_USER is set, the dlm knows that this is a userspace |
4582 | lock and that lkb_astparam is the dlm_user_args structure. */ | |
4583 | ||
d7db923e | 4584 | error = set_lock_args(mode, &ua->lksb, flags, namelen, timeout_cs, |
e5dae548 | 4585 | fake_astfn, ua, fake_bastfn, &args); |
597d0cae | 4586 | lkb->lkb_flags |= DLM_IFL_USER; |
597d0cae DT |
4587 | |
4588 | if (error) { | |
4589 | __put_lkb(ls, lkb); | |
4590 | goto out; | |
4591 | } | |
4592 | ||
4593 | error = request_lock(ls, lkb, name, namelen, &args); | |
4594 | ||
4595 | switch (error) { | |
4596 | case 0: | |
4597 | break; | |
4598 | case -EINPROGRESS: | |
4599 | error = 0; | |
4600 | break; | |
4601 | case -EAGAIN: | |
4602 | error = 0; | |
4603 | /* fall through */ | |
4604 | default: | |
4605 | __put_lkb(ls, lkb); | |
4606 | goto out; | |
4607 | } | |
4608 | ||
4609 | /* add this new lkb to the per-process list of locks */ | |
4610 | spin_lock(&ua->proc->locks_spin); | |
ef0c2bb0 | 4611 | hold_lkb(lkb); |
597d0cae DT |
4612 | list_add_tail(&lkb->lkb_ownqueue, &ua->proc->locks); |
4613 | spin_unlock(&ua->proc->locks_spin); | |
4614 | out: | |
85e86edf | 4615 | dlm_unlock_recovery(ls); |
597d0cae DT |
4616 | return error; |
4617 | } | |
4618 | ||
4619 | int dlm_user_convert(struct dlm_ls *ls, struct dlm_user_args *ua_tmp, | |
d7db923e DT |
4620 | int mode, uint32_t flags, uint32_t lkid, char *lvb_in, |
4621 | unsigned long timeout_cs) | |
597d0cae DT |
4622 | { |
4623 | struct dlm_lkb *lkb; | |
4624 | struct dlm_args args; | |
4625 | struct dlm_user_args *ua; | |
4626 | int error; | |
4627 | ||
85e86edf | 4628 | dlm_lock_recovery(ls); |
597d0cae DT |
4629 | |
4630 | error = find_lkb(ls, lkid, &lkb); | |
4631 | if (error) | |
4632 | goto out; | |
4633 | ||
4634 | /* user can change the params on its lock when it converts it, or | |
4635 | add an lvb that didn't exist before */ | |
4636 | ||
d292c0cc | 4637 | ua = lkb->lkb_ua; |
597d0cae DT |
4638 | |
4639 | if (flags & DLM_LKF_VALBLK && !ua->lksb.sb_lvbptr) { | |
573c24c4 | 4640 | ua->lksb.sb_lvbptr = kzalloc(DLM_USER_LVB_LEN, GFP_NOFS); |
597d0cae DT |
4641 | if (!ua->lksb.sb_lvbptr) { |
4642 | error = -ENOMEM; | |
4643 | goto out_put; | |
4644 | } | |
4645 | } | |
4646 | if (lvb_in && ua->lksb.sb_lvbptr) | |
4647 | memcpy(ua->lksb.sb_lvbptr, lvb_in, DLM_USER_LVB_LEN); | |
4648 | ||
d7db923e | 4649 | ua->xid = ua_tmp->xid; |
597d0cae DT |
4650 | ua->castparam = ua_tmp->castparam; |
4651 | ua->castaddr = ua_tmp->castaddr; | |
4652 | ua->bastparam = ua_tmp->bastparam; | |
4653 | ua->bastaddr = ua_tmp->bastaddr; | |
10948eb4 | 4654 | ua->user_lksb = ua_tmp->user_lksb; |
597d0cae | 4655 | |
d7db923e | 4656 | error = set_lock_args(mode, &ua->lksb, flags, 0, timeout_cs, |
e5dae548 | 4657 | fake_astfn, ua, fake_bastfn, &args); |
597d0cae DT |
4658 | if (error) |
4659 | goto out_put; | |
4660 | ||
4661 | error = convert_lock(ls, lkb, &args); | |
4662 | ||
c85d65e9 | 4663 | if (error == -EINPROGRESS || error == -EAGAIN || error == -EDEADLK) |
597d0cae DT |
4664 | error = 0; |
4665 | out_put: | |
4666 | dlm_put_lkb(lkb); | |
4667 | out: | |
85e86edf | 4668 | dlm_unlock_recovery(ls); |
597d0cae DT |
4669 | kfree(ua_tmp); |
4670 | return error; | |
4671 | } | |
4672 | ||
4673 | int dlm_user_unlock(struct dlm_ls *ls, struct dlm_user_args *ua_tmp, | |
4674 | uint32_t flags, uint32_t lkid, char *lvb_in) | |
4675 | { | |
4676 | struct dlm_lkb *lkb; | |
4677 | struct dlm_args args; | |
4678 | struct dlm_user_args *ua; | |
4679 | int error; | |
4680 | ||
85e86edf | 4681 | dlm_lock_recovery(ls); |
597d0cae DT |
4682 | |
4683 | error = find_lkb(ls, lkid, &lkb); | |
4684 | if (error) | |
4685 | goto out; | |
4686 | ||
d292c0cc | 4687 | ua = lkb->lkb_ua; |
597d0cae DT |
4688 | |
4689 | if (lvb_in && ua->lksb.sb_lvbptr) | |
4690 | memcpy(ua->lksb.sb_lvbptr, lvb_in, DLM_USER_LVB_LEN); | |
b434eda6 PC |
4691 | if (ua_tmp->castparam) |
4692 | ua->castparam = ua_tmp->castparam; | |
cc346d55 | 4693 | ua->user_lksb = ua_tmp->user_lksb; |
597d0cae DT |
4694 | |
4695 | error = set_unlock_args(flags, ua, &args); | |
4696 | if (error) | |
4697 | goto out_put; | |
4698 | ||
4699 | error = unlock_lock(ls, lkb, &args); | |
4700 | ||
4701 | if (error == -DLM_EUNLOCK) | |
4702 | error = 0; | |
ef0c2bb0 DT |
4703 | /* from validate_unlock_args() */ |
4704 | if (error == -EBUSY && (flags & DLM_LKF_FORCEUNLOCK)) | |
4705 | error = 0; | |
597d0cae DT |
4706 | if (error) |
4707 | goto out_put; | |
4708 | ||
4709 | spin_lock(&ua->proc->locks_spin); | |
a1bc86e6 DT |
4710 | /* dlm_user_add_ast() may have already taken lkb off the proc list */ |
4711 | if (!list_empty(&lkb->lkb_ownqueue)) | |
4712 | list_move(&lkb->lkb_ownqueue, &ua->proc->unlocking); | |
597d0cae | 4713 | spin_unlock(&ua->proc->locks_spin); |
597d0cae DT |
4714 | out_put: |
4715 | dlm_put_lkb(lkb); | |
4716 | out: | |
85e86edf | 4717 | dlm_unlock_recovery(ls); |
ef0c2bb0 | 4718 | kfree(ua_tmp); |
597d0cae DT |
4719 | return error; |
4720 | } | |
4721 | ||
4722 | int dlm_user_cancel(struct dlm_ls *ls, struct dlm_user_args *ua_tmp, | |
4723 | uint32_t flags, uint32_t lkid) | |
4724 | { | |
4725 | struct dlm_lkb *lkb; | |
4726 | struct dlm_args args; | |
4727 | struct dlm_user_args *ua; | |
4728 | int error; | |
4729 | ||
85e86edf | 4730 | dlm_lock_recovery(ls); |
597d0cae DT |
4731 | |
4732 | error = find_lkb(ls, lkid, &lkb); | |
4733 | if (error) | |
4734 | goto out; | |
4735 | ||
d292c0cc | 4736 | ua = lkb->lkb_ua; |
b434eda6 PC |
4737 | if (ua_tmp->castparam) |
4738 | ua->castparam = ua_tmp->castparam; | |
c059f70e | 4739 | ua->user_lksb = ua_tmp->user_lksb; |
597d0cae DT |
4740 | |
4741 | error = set_unlock_args(flags, ua, &args); | |
4742 | if (error) | |
4743 | goto out_put; | |
4744 | ||
4745 | error = cancel_lock(ls, lkb, &args); | |
4746 | ||
4747 | if (error == -DLM_ECANCEL) | |
4748 | error = 0; | |
ef0c2bb0 DT |
4749 | /* from validate_unlock_args() */ |
4750 | if (error == -EBUSY) | |
4751 | error = 0; | |
597d0cae DT |
4752 | out_put: |
4753 | dlm_put_lkb(lkb); | |
4754 | out: | |
85e86edf | 4755 | dlm_unlock_recovery(ls); |
ef0c2bb0 | 4756 | kfree(ua_tmp); |
597d0cae DT |
4757 | return error; |
4758 | } | |
4759 | ||
8b4021fa DT |
4760 | int dlm_user_deadlock(struct dlm_ls *ls, uint32_t flags, uint32_t lkid) |
4761 | { | |
4762 | struct dlm_lkb *lkb; | |
4763 | struct dlm_args args; | |
4764 | struct dlm_user_args *ua; | |
4765 | struct dlm_rsb *r; | |
4766 | int error; | |
4767 | ||
4768 | dlm_lock_recovery(ls); | |
4769 | ||
4770 | error = find_lkb(ls, lkid, &lkb); | |
4771 | if (error) | |
4772 | goto out; | |
4773 | ||
d292c0cc | 4774 | ua = lkb->lkb_ua; |
8b4021fa DT |
4775 | |
4776 | error = set_unlock_args(flags, ua, &args); | |
4777 | if (error) | |
4778 | goto out_put; | |
4779 | ||
4780 | /* same as cancel_lock(), but set DEADLOCK_CANCEL after lock_rsb */ | |
4781 | ||
4782 | r = lkb->lkb_resource; | |
4783 | hold_rsb(r); | |
4784 | lock_rsb(r); | |
4785 | ||
4786 | error = validate_unlock_args(lkb, &args); | |
4787 | if (error) | |
4788 | goto out_r; | |
4789 | lkb->lkb_flags |= DLM_IFL_DEADLOCK_CANCEL; | |
4790 | ||
4791 | error = _cancel_lock(r, lkb); | |
4792 | out_r: | |
4793 | unlock_rsb(r); | |
4794 | put_rsb(r); | |
4795 | ||
4796 | if (error == -DLM_ECANCEL) | |
4797 | error = 0; | |
4798 | /* from validate_unlock_args() */ | |
4799 | if (error == -EBUSY) | |
4800 | error = 0; | |
4801 | out_put: | |
4802 | dlm_put_lkb(lkb); | |
4803 | out: | |
4804 | dlm_unlock_recovery(ls); | |
4805 | return error; | |
4806 | } | |
4807 | ||
ef0c2bb0 DT |
4808 | /* lkb's that are removed from the waiters list by revert are just left on the |
4809 | orphans list with the granted orphan locks, to be freed by purge */ | |
4810 | ||
597d0cae DT |
4811 | static int orphan_proc_lock(struct dlm_ls *ls, struct dlm_lkb *lkb) |
4812 | { | |
ef0c2bb0 DT |
4813 | struct dlm_args args; |
4814 | int error; | |
597d0cae | 4815 | |
ef0c2bb0 DT |
4816 | hold_lkb(lkb); |
4817 | mutex_lock(&ls->ls_orphans_mutex); | |
4818 | list_add_tail(&lkb->lkb_ownqueue, &ls->ls_orphans); | |
4819 | mutex_unlock(&ls->ls_orphans_mutex); | |
597d0cae | 4820 | |
d292c0cc | 4821 | set_unlock_args(0, lkb->lkb_ua, &args); |
ef0c2bb0 DT |
4822 | |
4823 | error = cancel_lock(ls, lkb, &args); | |
4824 | if (error == -DLM_ECANCEL) | |
4825 | error = 0; | |
4826 | return error; | |
597d0cae DT |
4827 | } |
4828 | ||
4829 | /* The force flag allows the unlock to go ahead even if the lkb isn't granted. | |
4830 | Regardless of what rsb queue the lock is on, it's removed and freed. */ | |
4831 | ||
4832 | static int unlock_proc_lock(struct dlm_ls *ls, struct dlm_lkb *lkb) | |
4833 | { | |
597d0cae DT |
4834 | struct dlm_args args; |
4835 | int error; | |
4836 | ||
d292c0cc | 4837 | set_unlock_args(DLM_LKF_FORCEUNLOCK, lkb->lkb_ua, &args); |
597d0cae DT |
4838 | |
4839 | error = unlock_lock(ls, lkb, &args); | |
4840 | if (error == -DLM_EUNLOCK) | |
4841 | error = 0; | |
4842 | return error; | |
4843 | } | |
4844 | ||
ef0c2bb0 DT |
4845 | /* We have to release clear_proc_locks mutex before calling unlock_proc_lock() |
4846 | (which does lock_rsb) due to deadlock with receiving a message that does | |
4847 | lock_rsb followed by dlm_user_add_ast() */ | |
4848 | ||
4849 | static struct dlm_lkb *del_proc_lock(struct dlm_ls *ls, | |
4850 | struct dlm_user_proc *proc) | |
4851 | { | |
4852 | struct dlm_lkb *lkb = NULL; | |
4853 | ||
4854 | mutex_lock(&ls->ls_clear_proc_locks); | |
4855 | if (list_empty(&proc->locks)) | |
4856 | goto out; | |
4857 | ||
4858 | lkb = list_entry(proc->locks.next, struct dlm_lkb, lkb_ownqueue); | |
4859 | list_del_init(&lkb->lkb_ownqueue); | |
4860 | ||
4861 | if (lkb->lkb_exflags & DLM_LKF_PERSISTENT) | |
4862 | lkb->lkb_flags |= DLM_IFL_ORPHAN; | |
4863 | else | |
4864 | lkb->lkb_flags |= DLM_IFL_DEAD; | |
4865 | out: | |
4866 | mutex_unlock(&ls->ls_clear_proc_locks); | |
4867 | return lkb; | |
4868 | } | |
4869 | ||
597d0cae DT |
4870 | /* The ls_clear_proc_locks mutex protects against dlm_user_add_asts() which |
4871 | 1) references lkb->ua which we free here and 2) adds lkbs to proc->asts, | |
4872 | which we clear here. */ | |
4873 | ||
4874 | /* proc CLOSING flag is set so no more device_reads should look at proc->asts | |
4875 | list, and no more device_writes should add lkb's to proc->locks list; so we | |
4876 | shouldn't need to take asts_spin or locks_spin here. this assumes that | |
4877 | device reads/writes/closes are serialized -- FIXME: we may need to serialize | |
4878 | them ourself. */ | |
4879 | ||
4880 | void dlm_clear_proc_locks(struct dlm_ls *ls, struct dlm_user_proc *proc) | |
4881 | { | |
4882 | struct dlm_lkb *lkb, *safe; | |
4883 | ||
85e86edf | 4884 | dlm_lock_recovery(ls); |
597d0cae | 4885 | |
ef0c2bb0 DT |
4886 | while (1) { |
4887 | lkb = del_proc_lock(ls, proc); | |
4888 | if (!lkb) | |
4889 | break; | |
84d8cd69 | 4890 | del_timeout(lkb); |
ef0c2bb0 | 4891 | if (lkb->lkb_exflags & DLM_LKF_PERSISTENT) |
597d0cae | 4892 | orphan_proc_lock(ls, lkb); |
ef0c2bb0 | 4893 | else |
597d0cae | 4894 | unlock_proc_lock(ls, lkb); |
597d0cae DT |
4895 | |
4896 | /* this removes the reference for the proc->locks list | |
4897 | added by dlm_user_request, it may result in the lkb | |
4898 | being freed */ | |
4899 | ||
4900 | dlm_put_lkb(lkb); | |
4901 | } | |
a1bc86e6 | 4902 | |
ef0c2bb0 DT |
4903 | mutex_lock(&ls->ls_clear_proc_locks); |
4904 | ||
a1bc86e6 DT |
4905 | /* in-progress unlocks */ |
4906 | list_for_each_entry_safe(lkb, safe, &proc->unlocking, lkb_ownqueue) { | |
4907 | list_del_init(&lkb->lkb_ownqueue); | |
4908 | lkb->lkb_flags |= DLM_IFL_DEAD; | |
4909 | dlm_put_lkb(lkb); | |
4910 | } | |
4911 | ||
4912 | list_for_each_entry_safe(lkb, safe, &proc->asts, lkb_astqueue) { | |
8304d6f2 DT |
4913 | memset(&lkb->lkb_callbacks, 0, |
4914 | sizeof(struct dlm_callback) * DLM_CALLBACKS_SIZE); | |
4915 | list_del_init(&lkb->lkb_astqueue); | |
a1bc86e6 DT |
4916 | dlm_put_lkb(lkb); |
4917 | } | |
4918 | ||
597d0cae | 4919 | mutex_unlock(&ls->ls_clear_proc_locks); |
85e86edf | 4920 | dlm_unlock_recovery(ls); |
597d0cae | 4921 | } |
a1bc86e6 | 4922 | |
8499137d DT |
4923 | static void purge_proc_locks(struct dlm_ls *ls, struct dlm_user_proc *proc) |
4924 | { | |
4925 | struct dlm_lkb *lkb, *safe; | |
4926 | ||
4927 | while (1) { | |
4928 | lkb = NULL; | |
4929 | spin_lock(&proc->locks_spin); | |
4930 | if (!list_empty(&proc->locks)) { | |
4931 | lkb = list_entry(proc->locks.next, struct dlm_lkb, | |
4932 | lkb_ownqueue); | |
4933 | list_del_init(&lkb->lkb_ownqueue); | |
4934 | } | |
4935 | spin_unlock(&proc->locks_spin); | |
4936 | ||
4937 | if (!lkb) | |
4938 | break; | |
4939 | ||
4940 | lkb->lkb_flags |= DLM_IFL_DEAD; | |
4941 | unlock_proc_lock(ls, lkb); | |
4942 | dlm_put_lkb(lkb); /* ref from proc->locks list */ | |
4943 | } | |
4944 | ||
4945 | spin_lock(&proc->locks_spin); | |
4946 | list_for_each_entry_safe(lkb, safe, &proc->unlocking, lkb_ownqueue) { | |
4947 | list_del_init(&lkb->lkb_ownqueue); | |
4948 | lkb->lkb_flags |= DLM_IFL_DEAD; | |
4949 | dlm_put_lkb(lkb); | |
4950 | } | |
4951 | spin_unlock(&proc->locks_spin); | |
4952 | ||
4953 | spin_lock(&proc->asts_spin); | |
4954 | list_for_each_entry_safe(lkb, safe, &proc->asts, lkb_astqueue) { | |
8304d6f2 DT |
4955 | memset(&lkb->lkb_callbacks, 0, |
4956 | sizeof(struct dlm_callback) * DLM_CALLBACKS_SIZE); | |
4957 | list_del_init(&lkb->lkb_astqueue); | |
8499137d DT |
4958 | dlm_put_lkb(lkb); |
4959 | } | |
4960 | spin_unlock(&proc->asts_spin); | |
4961 | } | |
4962 | ||
4963 | /* pid of 0 means purge all orphans */ | |
4964 | ||
4965 | static void do_purge(struct dlm_ls *ls, int nodeid, int pid) | |
4966 | { | |
4967 | struct dlm_lkb *lkb, *safe; | |
4968 | ||
4969 | mutex_lock(&ls->ls_orphans_mutex); | |
4970 | list_for_each_entry_safe(lkb, safe, &ls->ls_orphans, lkb_ownqueue) { | |
4971 | if (pid && lkb->lkb_ownpid != pid) | |
4972 | continue; | |
4973 | unlock_proc_lock(ls, lkb); | |
4974 | list_del_init(&lkb->lkb_ownqueue); | |
4975 | dlm_put_lkb(lkb); | |
4976 | } | |
4977 | mutex_unlock(&ls->ls_orphans_mutex); | |
4978 | } | |
4979 | ||
4980 | static int send_purge(struct dlm_ls *ls, int nodeid, int pid) | |
4981 | { | |
4982 | struct dlm_message *ms; | |
4983 | struct dlm_mhandle *mh; | |
4984 | int error; | |
4985 | ||
4986 | error = _create_message(ls, sizeof(struct dlm_message), nodeid, | |
4987 | DLM_MSG_PURGE, &ms, &mh); | |
4988 | if (error) | |
4989 | return error; | |
4990 | ms->m_nodeid = nodeid; | |
4991 | ms->m_pid = pid; | |
4992 | ||
4993 | return send_message(mh, ms); | |
4994 | } | |
4995 | ||
4996 | int dlm_user_purge(struct dlm_ls *ls, struct dlm_user_proc *proc, | |
4997 | int nodeid, int pid) | |
4998 | { | |
4999 | int error = 0; | |
5000 | ||
5001 | if (nodeid != dlm_our_nodeid()) { | |
5002 | error = send_purge(ls, nodeid, pid); | |
5003 | } else { | |
85e86edf | 5004 | dlm_lock_recovery(ls); |
8499137d DT |
5005 | if (pid == current->pid) |
5006 | purge_proc_locks(ls, proc); | |
5007 | else | |
5008 | do_purge(ls, nodeid, pid); | |
85e86edf | 5009 | dlm_unlock_recovery(ls); |
8499137d DT |
5010 | } |
5011 | return error; | |
5012 | } | |
5013 |