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2522fe45 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
e7fd4179 DT |
2 | /****************************************************************************** |
3 | ******************************************************************************* | |
4 | ** | |
7fe2b319 | 5 | ** Copyright (C) 2005-2010 Red Hat, Inc. All rights reserved. |
e7fd4179 | 6 | ** |
e7fd4179 DT |
7 | ** |
8 | ******************************************************************************* | |
9 | ******************************************************************************/ | |
10 | ||
11 | /* Central locking logic has four stages: | |
12 | ||
13 | dlm_lock() | |
14 | dlm_unlock() | |
15 | ||
16 | request_lock(ls, lkb) | |
17 | convert_lock(ls, lkb) | |
18 | unlock_lock(ls, lkb) | |
19 | cancel_lock(ls, lkb) | |
20 | ||
21 | _request_lock(r, lkb) | |
22 | _convert_lock(r, lkb) | |
23 | _unlock_lock(r, lkb) | |
24 | _cancel_lock(r, lkb) | |
25 | ||
26 | do_request(r, lkb) | |
27 | do_convert(r, lkb) | |
28 | do_unlock(r, lkb) | |
29 | do_cancel(r, lkb) | |
30 | ||
31 | Stage 1 (lock, unlock) is mainly about checking input args and | |
32 | splitting into one of the four main operations: | |
33 | ||
34 | dlm_lock = request_lock | |
35 | dlm_lock+CONVERT = convert_lock | |
36 | dlm_unlock = unlock_lock | |
37 | dlm_unlock+CANCEL = cancel_lock | |
38 | ||
39 | Stage 2, xxxx_lock(), just finds and locks the relevant rsb which is | |
40 | provided to the next stage. | |
41 | ||
42 | Stage 3, _xxxx_lock(), determines if the operation is local or remote. | |
43 | When remote, it calls send_xxxx(), when local it calls do_xxxx(). | |
44 | ||
45 | Stage 4, do_xxxx(), is the guts of the operation. It manipulates the | |
46 | given rsb and lkb and queues callbacks. | |
47 | ||
48 | For remote operations, send_xxxx() results in the corresponding do_xxxx() | |
49 | function being executed on the remote node. The connecting send/receive | |
50 | calls on local (L) and remote (R) nodes: | |
51 | ||
52 | L: send_xxxx() -> R: receive_xxxx() | |
53 | R: do_xxxx() | |
54 | L: receive_xxxx_reply() <- R: send_xxxx_reply() | |
55 | */ | |
f1d3b8f9 AA |
56 | #include <trace/events/dlm.h> |
57 | ||
597d0cae | 58 | #include <linux/types.h> |
9beb3bf5 | 59 | #include <linux/rbtree.h> |
5a0e3ad6 | 60 | #include <linux/slab.h> |
e7fd4179 | 61 | #include "dlm_internal.h" |
597d0cae | 62 | #include <linux/dlm_device.h> |
e7fd4179 | 63 | #include "memory.h" |
a070a91c | 64 | #include "midcomms.h" |
e7fd4179 DT |
65 | #include "requestqueue.h" |
66 | #include "util.h" | |
67 | #include "dir.h" | |
68 | #include "member.h" | |
69 | #include "lockspace.h" | |
70 | #include "ast.h" | |
71 | #include "lock.h" | |
72 | #include "rcom.h" | |
73 | #include "recover.h" | |
74 | #include "lvb_table.h" | |
597d0cae | 75 | #include "user.h" |
e7fd4179 DT |
76 | #include "config.h" |
77 | ||
78 | static int send_request(struct dlm_rsb *r, struct dlm_lkb *lkb); | |
79 | static int send_convert(struct dlm_rsb *r, struct dlm_lkb *lkb); | |
80 | static int send_unlock(struct dlm_rsb *r, struct dlm_lkb *lkb); | |
81 | static int send_cancel(struct dlm_rsb *r, struct dlm_lkb *lkb); | |
82 | static int send_grant(struct dlm_rsb *r, struct dlm_lkb *lkb); | |
83 | static int send_bast(struct dlm_rsb *r, struct dlm_lkb *lkb, int mode); | |
84 | static int send_lookup(struct dlm_rsb *r, struct dlm_lkb *lkb); | |
85 | static int send_remove(struct dlm_rsb *r); | |
86 | static int _request_lock(struct dlm_rsb *r, struct dlm_lkb *lkb); | |
3ae1acf9 | 87 | static int _cancel_lock(struct dlm_rsb *r, struct dlm_lkb *lkb); |
e7fd4179 | 88 | static void __receive_convert_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, |
9f48eead | 89 | struct dlm_message *ms, bool local); |
e7fd4179 | 90 | static int receive_extralen(struct dlm_message *ms); |
8499137d | 91 | static void do_purge(struct dlm_ls *ls, int nodeid, int pid); |
c04fecb4 | 92 | static void toss_rsb(struct kref *kref); |
e7fd4179 DT |
93 | |
94 | /* | |
95 | * Lock compatibilty matrix - thanks Steve | |
96 | * UN = Unlocked state. Not really a state, used as a flag | |
97 | * PD = Padding. Used to make the matrix a nice power of two in size | |
98 | * Other states are the same as the VMS DLM. | |
99 | * Usage: matrix[grmode+1][rqmode+1] (although m[rq+1][gr+1] is the same) | |
100 | */ | |
101 | ||
102 | static const int __dlm_compat_matrix[8][8] = { | |
103 | /* UN NL CR CW PR PW EX PD */ | |
104 | {1, 1, 1, 1, 1, 1, 1, 0}, /* UN */ | |
105 | {1, 1, 1, 1, 1, 1, 1, 0}, /* NL */ | |
106 | {1, 1, 1, 1, 1, 1, 0, 0}, /* CR */ | |
107 | {1, 1, 1, 1, 0, 0, 0, 0}, /* CW */ | |
108 | {1, 1, 1, 0, 1, 0, 0, 0}, /* PR */ | |
109 | {1, 1, 1, 0, 0, 0, 0, 0}, /* PW */ | |
110 | {1, 1, 0, 0, 0, 0, 0, 0}, /* EX */ | |
111 | {0, 0, 0, 0, 0, 0, 0, 0} /* PD */ | |
112 | }; | |
113 | ||
114 | /* | |
115 | * This defines the direction of transfer of LVB data. | |
116 | * Granted mode is the row; requested mode is the column. | |
117 | * Usage: matrix[grmode+1][rqmode+1] | |
118 | * 1 = LVB is returned to the caller | |
119 | * 0 = LVB is written to the resource | |
120 | * -1 = nothing happens to the LVB | |
121 | */ | |
122 | ||
123 | const int dlm_lvb_operations[8][8] = { | |
124 | /* UN NL CR CW PR PW EX PD*/ | |
125 | { -1, 1, 1, 1, 1, 1, 1, -1 }, /* UN */ | |
126 | { -1, 1, 1, 1, 1, 1, 1, 0 }, /* NL */ | |
127 | { -1, -1, 1, 1, 1, 1, 1, 0 }, /* CR */ | |
128 | { -1, -1, -1, 1, 1, 1, 1, 0 }, /* CW */ | |
129 | { -1, -1, -1, -1, 1, 1, 1, 0 }, /* PR */ | |
130 | { -1, 0, 0, 0, 0, 0, 1, 0 }, /* PW */ | |
131 | { -1, 0, 0, 0, 0, 0, 0, 0 }, /* EX */ | |
132 | { -1, 0, 0, 0, 0, 0, 0, 0 } /* PD */ | |
133 | }; | |
e7fd4179 DT |
134 | |
135 | #define modes_compat(gr, rq) \ | |
136 | __dlm_compat_matrix[(gr)->lkb_grmode + 1][(rq)->lkb_rqmode + 1] | |
137 | ||
138 | int dlm_modes_compat(int mode1, int mode2) | |
139 | { | |
140 | return __dlm_compat_matrix[mode1 + 1][mode2 + 1]; | |
141 | } | |
142 | ||
143 | /* | |
144 | * Compatibility matrix for conversions with QUECVT set. | |
145 | * Granted mode is the row; requested mode is the column. | |
146 | * Usage: matrix[grmode+1][rqmode+1] | |
147 | */ | |
148 | ||
149 | static const int __quecvt_compat_matrix[8][8] = { | |
150 | /* UN NL CR CW PR PW EX PD */ | |
151 | {0, 0, 0, 0, 0, 0, 0, 0}, /* UN */ | |
152 | {0, 0, 1, 1, 1, 1, 1, 0}, /* NL */ | |
153 | {0, 0, 0, 1, 1, 1, 1, 0}, /* CR */ | |
154 | {0, 0, 0, 0, 1, 1, 1, 0}, /* CW */ | |
155 | {0, 0, 0, 1, 0, 1, 1, 0}, /* PR */ | |
156 | {0, 0, 0, 0, 0, 0, 1, 0}, /* PW */ | |
157 | {0, 0, 0, 0, 0, 0, 0, 0}, /* EX */ | |
158 | {0, 0, 0, 0, 0, 0, 0, 0} /* PD */ | |
159 | }; | |
160 | ||
597d0cae | 161 | void dlm_print_lkb(struct dlm_lkb *lkb) |
e7fd4179 | 162 | { |
6d40c4a7 | 163 | printk(KERN_ERR "lkb: nodeid %d id %x remid %x exflags %x flags %x " |
4875647a | 164 | "sts %d rq %d gr %d wait_type %d wait_nodeid %d seq %llu\n", |
e7fd4179 | 165 | lkb->lkb_nodeid, lkb->lkb_id, lkb->lkb_remid, lkb->lkb_exflags, |
e1af8728 | 166 | dlm_iflags_val(lkb), lkb->lkb_status, lkb->lkb_rqmode, |
4875647a DT |
167 | lkb->lkb_grmode, lkb->lkb_wait_type, lkb->lkb_wait_nodeid, |
168 | (unsigned long long)lkb->lkb_recover_seq); | |
e7fd4179 DT |
169 | } |
170 | ||
170e19ab | 171 | static void dlm_print_rsb(struct dlm_rsb *r) |
e7fd4179 | 172 | { |
c04fecb4 DT |
173 | printk(KERN_ERR "rsb: nodeid %d master %d dir %d flags %lx first %x " |
174 | "rlc %d name %s\n", | |
175 | r->res_nodeid, r->res_master_nodeid, r->res_dir_nodeid, | |
176 | r->res_flags, r->res_first_lkid, r->res_recover_locks_count, | |
177 | r->res_name); | |
e7fd4179 DT |
178 | } |
179 | ||
a345da3e DT |
180 | void dlm_dump_rsb(struct dlm_rsb *r) |
181 | { | |
182 | struct dlm_lkb *lkb; | |
183 | ||
184 | dlm_print_rsb(r); | |
185 | ||
186 | printk(KERN_ERR "rsb: root_list empty %d recover_list empty %d\n", | |
187 | list_empty(&r->res_root_list), list_empty(&r->res_recover_list)); | |
188 | printk(KERN_ERR "rsb lookup list\n"); | |
189 | list_for_each_entry(lkb, &r->res_lookup, lkb_rsb_lookup) | |
190 | dlm_print_lkb(lkb); | |
191 | printk(KERN_ERR "rsb grant queue:\n"); | |
192 | list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) | |
193 | dlm_print_lkb(lkb); | |
194 | printk(KERN_ERR "rsb convert queue:\n"); | |
195 | list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) | |
196 | dlm_print_lkb(lkb); | |
197 | printk(KERN_ERR "rsb wait queue:\n"); | |
198 | list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue) | |
199 | dlm_print_lkb(lkb); | |
200 | } | |
201 | ||
e7fd4179 DT |
202 | /* Threads cannot use the lockspace while it's being recovered */ |
203 | ||
85e86edf | 204 | static inline void dlm_lock_recovery(struct dlm_ls *ls) |
e7fd4179 DT |
205 | { |
206 | down_read(&ls->ls_in_recovery); | |
207 | } | |
208 | ||
85e86edf | 209 | void dlm_unlock_recovery(struct dlm_ls *ls) |
e7fd4179 DT |
210 | { |
211 | up_read(&ls->ls_in_recovery); | |
212 | } | |
213 | ||
85e86edf | 214 | int dlm_lock_recovery_try(struct dlm_ls *ls) |
e7fd4179 DT |
215 | { |
216 | return down_read_trylock(&ls->ls_in_recovery); | |
217 | } | |
218 | ||
219 | static inline int can_be_queued(struct dlm_lkb *lkb) | |
220 | { | |
221 | return !(lkb->lkb_exflags & DLM_LKF_NOQUEUE); | |
222 | } | |
223 | ||
224 | static inline int force_blocking_asts(struct dlm_lkb *lkb) | |
225 | { | |
226 | return (lkb->lkb_exflags & DLM_LKF_NOQUEUEBAST); | |
227 | } | |
228 | ||
229 | static inline int is_demoted(struct dlm_lkb *lkb) | |
230 | { | |
1361737f | 231 | return test_bit(DLM_SBF_DEMOTED_BIT, &lkb->lkb_sbflags); |
e7fd4179 DT |
232 | } |
233 | ||
7d3c1feb DT |
234 | static inline int is_altmode(struct dlm_lkb *lkb) |
235 | { | |
1361737f | 236 | return test_bit(DLM_SBF_ALTMODE_BIT, &lkb->lkb_sbflags); |
7d3c1feb DT |
237 | } |
238 | ||
239 | static inline int is_granted(struct dlm_lkb *lkb) | |
240 | { | |
241 | return (lkb->lkb_status == DLM_LKSTS_GRANTED); | |
242 | } | |
243 | ||
e7fd4179 DT |
244 | static inline int is_remote(struct dlm_rsb *r) |
245 | { | |
246 | DLM_ASSERT(r->res_nodeid >= 0, dlm_print_rsb(r);); | |
247 | return !!r->res_nodeid; | |
248 | } | |
249 | ||
250 | static inline int is_process_copy(struct dlm_lkb *lkb) | |
251 | { | |
e1af8728 AA |
252 | return lkb->lkb_nodeid && |
253 | !test_bit(DLM_IFL_MSTCPY_BIT, &lkb->lkb_iflags); | |
e7fd4179 DT |
254 | } |
255 | ||
256 | static inline int is_master_copy(struct dlm_lkb *lkb) | |
257 | { | |
e1af8728 | 258 | return test_bit(DLM_IFL_MSTCPY_BIT, &lkb->lkb_iflags); |
e7fd4179 DT |
259 | } |
260 | ||
261 | static inline int middle_conversion(struct dlm_lkb *lkb) | |
262 | { | |
263 | if ((lkb->lkb_grmode==DLM_LOCK_PR && lkb->lkb_rqmode==DLM_LOCK_CW) || | |
264 | (lkb->lkb_rqmode==DLM_LOCK_PR && lkb->lkb_grmode==DLM_LOCK_CW)) | |
90135925 DT |
265 | return 1; |
266 | return 0; | |
e7fd4179 DT |
267 | } |
268 | ||
269 | static inline int down_conversion(struct dlm_lkb *lkb) | |
270 | { | |
271 | return (!middle_conversion(lkb) && lkb->lkb_rqmode < lkb->lkb_grmode); | |
272 | } | |
273 | ||
ef0c2bb0 DT |
274 | static inline int is_overlap_unlock(struct dlm_lkb *lkb) |
275 | { | |
e1af8728 | 276 | return test_bit(DLM_IFL_OVERLAP_UNLOCK_BIT, &lkb->lkb_iflags); |
ef0c2bb0 DT |
277 | } |
278 | ||
279 | static inline int is_overlap_cancel(struct dlm_lkb *lkb) | |
280 | { | |
e1af8728 | 281 | return test_bit(DLM_IFL_OVERLAP_CANCEL_BIT, &lkb->lkb_iflags); |
ef0c2bb0 DT |
282 | } |
283 | ||
284 | static inline int is_overlap(struct dlm_lkb *lkb) | |
285 | { | |
e1af8728 AA |
286 | return test_bit(DLM_IFL_OVERLAP_UNLOCK_BIT, &lkb->lkb_iflags) || |
287 | test_bit(DLM_IFL_OVERLAP_CANCEL_BIT, &lkb->lkb_iflags); | |
ef0c2bb0 DT |
288 | } |
289 | ||
e7fd4179 DT |
290 | static void queue_cast(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv) |
291 | { | |
292 | if (is_master_copy(lkb)) | |
293 | return; | |
294 | ||
295 | DLM_ASSERT(lkb->lkb_lksb, dlm_print_lkb(lkb);); | |
296 | ||
e1af8728 AA |
297 | if (rv == -DLM_ECANCEL && |
298 | test_and_clear_bit(DLM_IFL_DEADLOCK_CANCEL_BIT, &lkb->lkb_iflags)) | |
8b4021fa | 299 | rv = -EDEADLK; |
8b4021fa | 300 | |
1361737f | 301 | dlm_add_cb(lkb, DLM_CB_CAST, lkb->lkb_grmode, rv, dlm_sbflags_val(lkb)); |
e7fd4179 DT |
302 | } |
303 | ||
ef0c2bb0 DT |
304 | static inline void queue_cast_overlap(struct dlm_rsb *r, struct dlm_lkb *lkb) |
305 | { | |
306 | queue_cast(r, lkb, | |
307 | is_overlap_unlock(lkb) ? -DLM_EUNLOCK : -DLM_ECANCEL); | |
308 | } | |
309 | ||
e7fd4179 DT |
310 | static void queue_bast(struct dlm_rsb *r, struct dlm_lkb *lkb, int rqmode) |
311 | { | |
b6fa8796 | 312 | if (is_master_copy(lkb)) { |
e7fd4179 | 313 | send_bast(r, lkb, rqmode); |
b6fa8796 | 314 | } else { |
23e8e1aa | 315 | dlm_add_cb(lkb, DLM_CB_BAST, rqmode, 0, 0); |
b6fa8796 | 316 | } |
e7fd4179 DT |
317 | } |
318 | ||
319 | /* | |
320 | * Basic operations on rsb's and lkb's | |
321 | */ | |
322 | ||
c04fecb4 DT |
323 | /* This is only called to add a reference when the code already holds |
324 | a valid reference to the rsb, so there's no need for locking. */ | |
325 | ||
326 | static inline void hold_rsb(struct dlm_rsb *r) | |
327 | { | |
328 | kref_get(&r->res_ref); | |
329 | } | |
330 | ||
331 | void dlm_hold_rsb(struct dlm_rsb *r) | |
332 | { | |
333 | hold_rsb(r); | |
334 | } | |
335 | ||
336 | /* When all references to the rsb are gone it's transferred to | |
337 | the tossed list for later disposal. */ | |
338 | ||
339 | static void put_rsb(struct dlm_rsb *r) | |
340 | { | |
341 | struct dlm_ls *ls = r->res_ls; | |
342 | uint32_t bucket = r->res_bucket; | |
9502a7f6 | 343 | int rv; |
c04fecb4 | 344 | |
9502a7f6 AA |
345 | rv = kref_put_lock(&r->res_ref, toss_rsb, |
346 | &ls->ls_rsbtbl[bucket].lock); | |
347 | if (rv) | |
348 | spin_unlock(&ls->ls_rsbtbl[bucket].lock); | |
c04fecb4 DT |
349 | } |
350 | ||
351 | void dlm_put_rsb(struct dlm_rsb *r) | |
352 | { | |
353 | put_rsb(r); | |
354 | } | |
355 | ||
3881ac04 DT |
356 | static int pre_rsb_struct(struct dlm_ls *ls) |
357 | { | |
358 | struct dlm_rsb *r1, *r2; | |
359 | int count = 0; | |
360 | ||
361 | spin_lock(&ls->ls_new_rsb_spin); | |
362 | if (ls->ls_new_rsb_count > dlm_config.ci_new_rsb_count / 2) { | |
363 | spin_unlock(&ls->ls_new_rsb_spin); | |
364 | return 0; | |
365 | } | |
366 | spin_unlock(&ls->ls_new_rsb_spin); | |
367 | ||
368 | r1 = dlm_allocate_rsb(ls); | |
369 | r2 = dlm_allocate_rsb(ls); | |
370 | ||
371 | spin_lock(&ls->ls_new_rsb_spin); | |
372 | if (r1) { | |
373 | list_add(&r1->res_hashchain, &ls->ls_new_rsb); | |
374 | ls->ls_new_rsb_count++; | |
375 | } | |
376 | if (r2) { | |
377 | list_add(&r2->res_hashchain, &ls->ls_new_rsb); | |
378 | ls->ls_new_rsb_count++; | |
379 | } | |
380 | count = ls->ls_new_rsb_count; | |
381 | spin_unlock(&ls->ls_new_rsb_spin); | |
382 | ||
383 | if (!count) | |
384 | return -ENOMEM; | |
385 | return 0; | |
386 | } | |
387 | ||
388 | /* If ls->ls_new_rsb is empty, return -EAGAIN, so the caller can | |
389 | unlock any spinlocks, go back and call pre_rsb_struct again. | |
390 | Otherwise, take an rsb off the list and return it. */ | |
391 | ||
56171e0d | 392 | static int get_rsb_struct(struct dlm_ls *ls, const void *name, int len, |
3881ac04 | 393 | struct dlm_rsb **r_ret) |
e7fd4179 DT |
394 | { |
395 | struct dlm_rsb *r; | |
3881ac04 DT |
396 | int count; |
397 | ||
398 | spin_lock(&ls->ls_new_rsb_spin); | |
399 | if (list_empty(&ls->ls_new_rsb)) { | |
400 | count = ls->ls_new_rsb_count; | |
401 | spin_unlock(&ls->ls_new_rsb_spin); | |
402 | log_debug(ls, "find_rsb retry %d %d %s", | |
56171e0d AA |
403 | count, dlm_config.ci_new_rsb_count, |
404 | (const char *)name); | |
3881ac04 DT |
405 | return -EAGAIN; |
406 | } | |
e7fd4179 | 407 | |
3881ac04 DT |
408 | r = list_first_entry(&ls->ls_new_rsb, struct dlm_rsb, res_hashchain); |
409 | list_del(&r->res_hashchain); | |
9beb3bf5 BP |
410 | /* Convert the empty list_head to a NULL rb_node for tree usage: */ |
411 | memset(&r->res_hashnode, 0, sizeof(struct rb_node)); | |
3881ac04 DT |
412 | ls->ls_new_rsb_count--; |
413 | spin_unlock(&ls->ls_new_rsb_spin); | |
e7fd4179 DT |
414 | |
415 | r->res_ls = ls; | |
416 | r->res_length = len; | |
417 | memcpy(r->res_name, name, len); | |
90135925 | 418 | mutex_init(&r->res_mutex); |
e7fd4179 DT |
419 | |
420 | INIT_LIST_HEAD(&r->res_lookup); | |
421 | INIT_LIST_HEAD(&r->res_grantqueue); | |
422 | INIT_LIST_HEAD(&r->res_convertqueue); | |
423 | INIT_LIST_HEAD(&r->res_waitqueue); | |
424 | INIT_LIST_HEAD(&r->res_root_list); | |
425 | INIT_LIST_HEAD(&r->res_recover_list); | |
426 | ||
3881ac04 DT |
427 | *r_ret = r; |
428 | return 0; | |
e7fd4179 DT |
429 | } |
430 | ||
9beb3bf5 BP |
431 | static int rsb_cmp(struct dlm_rsb *r, const char *name, int nlen) |
432 | { | |
433 | char maxname[DLM_RESNAME_MAXLEN]; | |
434 | ||
435 | memset(maxname, 0, DLM_RESNAME_MAXLEN); | |
436 | memcpy(maxname, name, nlen); | |
437 | return memcmp(r->res_name, maxname, DLM_RESNAME_MAXLEN); | |
438 | } | |
439 | ||
56171e0d | 440 | int dlm_search_rsb_tree(struct rb_root *tree, const void *name, int len, |
c04fecb4 | 441 | struct dlm_rsb **r_ret) |
e7fd4179 | 442 | { |
9beb3bf5 | 443 | struct rb_node *node = tree->rb_node; |
e7fd4179 | 444 | struct dlm_rsb *r; |
9beb3bf5 BP |
445 | int rc; |
446 | ||
447 | while (node) { | |
448 | r = rb_entry(node, struct dlm_rsb, res_hashnode); | |
449 | rc = rsb_cmp(r, name, len); | |
450 | if (rc < 0) | |
451 | node = node->rb_left; | |
452 | else if (rc > 0) | |
453 | node = node->rb_right; | |
454 | else | |
e7fd4179 DT |
455 | goto found; |
456 | } | |
18c60c0a | 457 | *r_ret = NULL; |
597d0cae | 458 | return -EBADR; |
e7fd4179 DT |
459 | |
460 | found: | |
e7fd4179 | 461 | *r_ret = r; |
c04fecb4 | 462 | return 0; |
e7fd4179 DT |
463 | } |
464 | ||
9beb3bf5 BP |
465 | static int rsb_insert(struct dlm_rsb *rsb, struct rb_root *tree) |
466 | { | |
467 | struct rb_node **newn = &tree->rb_node; | |
468 | struct rb_node *parent = NULL; | |
469 | int rc; | |
470 | ||
471 | while (*newn) { | |
472 | struct dlm_rsb *cur = rb_entry(*newn, struct dlm_rsb, | |
473 | res_hashnode); | |
474 | ||
475 | parent = *newn; | |
476 | rc = rsb_cmp(cur, rsb->res_name, rsb->res_length); | |
477 | if (rc < 0) | |
478 | newn = &parent->rb_left; | |
479 | else if (rc > 0) | |
480 | newn = &parent->rb_right; | |
481 | else { | |
482 | log_print("rsb_insert match"); | |
483 | dlm_dump_rsb(rsb); | |
484 | dlm_dump_rsb(cur); | |
485 | return -EEXIST; | |
486 | } | |
487 | } | |
488 | ||
489 | rb_link_node(&rsb->res_hashnode, parent, newn); | |
490 | rb_insert_color(&rsb->res_hashnode, tree); | |
491 | return 0; | |
492 | } | |
493 | ||
c04fecb4 DT |
494 | /* |
495 | * Find rsb in rsbtbl and potentially create/add one | |
496 | * | |
497 | * Delaying the release of rsb's has a similar benefit to applications keeping | |
498 | * NL locks on an rsb, but without the guarantee that the cached master value | |
499 | * will still be valid when the rsb is reused. Apps aren't always smart enough | |
500 | * to keep NL locks on an rsb that they may lock again shortly; this can lead | |
501 | * to excessive master lookups and removals if we don't delay the release. | |
502 | * | |
503 | * Searching for an rsb means looking through both the normal list and toss | |
504 | * list. When found on the toss list the rsb is moved to the normal list with | |
505 | * ref count of 1; when found on normal list the ref count is incremented. | |
506 | * | |
507 | * rsb's on the keep list are being used locally and refcounted. | |
508 | * rsb's on the toss list are not being used locally, and are not refcounted. | |
509 | * | |
510 | * The toss list rsb's were either | |
511 | * - previously used locally but not any more (were on keep list, then | |
512 | * moved to toss list when last refcount dropped) | |
513 | * - created and put on toss list as a directory record for a lookup | |
514 | * (we are the dir node for the res, but are not using the res right now, | |
515 | * but some other node is) | |
516 | * | |
517 | * The purpose of find_rsb() is to return a refcounted rsb for local use. | |
518 | * So, if the given rsb is on the toss list, it is moved to the keep list | |
519 | * before being returned. | |
520 | * | |
521 | * toss_rsb() happens when all local usage of the rsb is done, i.e. no | |
522 | * more refcounts exist, so the rsb is moved from the keep list to the | |
523 | * toss list. | |
524 | * | |
525 | * rsb's on both keep and toss lists are used for doing a name to master | |
526 | * lookups. rsb's that are in use locally (and being refcounted) are on | |
527 | * the keep list, rsb's that are not in use locally (not refcounted) and | |
528 | * only exist for name/master lookups are on the toss list. | |
529 | * | |
530 | * rsb's on the toss list who's dir_nodeid is not local can have stale | |
531 | * name/master mappings. So, remote requests on such rsb's can potentially | |
532 | * return with an error, which means the mapping is stale and needs to | |
533 | * be updated with a new lookup. (The idea behind MASTER UNCERTAIN and | |
534 | * first_lkid is to keep only a single outstanding request on an rsb | |
535 | * while that rsb has a potentially stale master.) | |
536 | */ | |
537 | ||
56171e0d | 538 | static int find_rsb_dir(struct dlm_ls *ls, const void *name, int len, |
c04fecb4 DT |
539 | uint32_t hash, uint32_t b, |
540 | int dir_nodeid, int from_nodeid, | |
541 | unsigned int flags, struct dlm_rsb **r_ret) | |
e7fd4179 | 542 | { |
c04fecb4 DT |
543 | struct dlm_rsb *r = NULL; |
544 | int our_nodeid = dlm_our_nodeid(); | |
545 | int from_local = 0; | |
546 | int from_other = 0; | |
547 | int from_dir = 0; | |
548 | int create = 0; | |
e7fd4179 DT |
549 | int error; |
550 | ||
c04fecb4 DT |
551 | if (flags & R_RECEIVE_REQUEST) { |
552 | if (from_nodeid == dir_nodeid) | |
553 | from_dir = 1; | |
554 | else | |
555 | from_other = 1; | |
556 | } else if (flags & R_REQUEST) { | |
557 | from_local = 1; | |
558 | } | |
559 | ||
560 | /* | |
561 | * flags & R_RECEIVE_RECOVER is from dlm_recover_master_copy, so | |
562 | * from_nodeid has sent us a lock in dlm_recover_locks, believing | |
563 | * we're the new master. Our local recovery may not have set | |
564 | * res_master_nodeid to our_nodeid yet, so allow either. Don't | |
565 | * create the rsb; dlm_recover_process_copy() will handle EBADR | |
566 | * by resending. | |
567 | * | |
568 | * If someone sends us a request, we are the dir node, and we do | |
569 | * not find the rsb anywhere, then recreate it. This happens if | |
570 | * someone sends us a request after we have removed/freed an rsb | |
571 | * from our toss list. (They sent a request instead of lookup | |
572 | * because they are using an rsb from their toss list.) | |
573 | */ | |
574 | ||
575 | if (from_local || from_dir || | |
576 | (from_other && (dir_nodeid == our_nodeid))) { | |
577 | create = 1; | |
e7fd4179 | 578 | } |
57638bf3 | 579 | |
c04fecb4 DT |
580 | retry: |
581 | if (create) { | |
582 | error = pre_rsb_struct(ls); | |
583 | if (error < 0) | |
584 | goto out; | |
585 | } | |
586 | ||
587 | spin_lock(&ls->ls_rsbtbl[b].lock); | |
588 | ||
589 | error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].keep, name, len, &r); | |
e7fd4179 | 590 | if (error) |
c04fecb4 DT |
591 | goto do_toss; |
592 | ||
593 | /* | |
594 | * rsb is active, so we can't check master_nodeid without lock_rsb. | |
595 | */ | |
e7fd4179 | 596 | |
c04fecb4 | 597 | kref_get(&r->res_ref); |
c04fecb4 DT |
598 | goto out_unlock; |
599 | ||
600 | ||
601 | do_toss: | |
602 | error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].toss, name, len, &r); | |
9beb3bf5 | 603 | if (error) |
c04fecb4 | 604 | goto do_new; |
e7fd4179 | 605 | |
c04fecb4 DT |
606 | /* |
607 | * rsb found inactive (master_nodeid may be out of date unless | |
608 | * we are the dir_nodeid or were the master) No other thread | |
609 | * is using this rsb because it's on the toss list, so we can | |
610 | * look at or update res_master_nodeid without lock_rsb. | |
611 | */ | |
e7fd4179 | 612 | |
c04fecb4 DT |
613 | if ((r->res_master_nodeid != our_nodeid) && from_other) { |
614 | /* our rsb was not master, and another node (not the dir node) | |
615 | has sent us a request */ | |
616 | log_debug(ls, "find_rsb toss from_other %d master %d dir %d %s", | |
617 | from_nodeid, r->res_master_nodeid, dir_nodeid, | |
618 | r->res_name); | |
619 | error = -ENOTBLK; | |
620 | goto out_unlock; | |
621 | } | |
622 | ||
623 | if ((r->res_master_nodeid != our_nodeid) && from_dir) { | |
624 | /* don't think this should ever happen */ | |
625 | log_error(ls, "find_rsb toss from_dir %d master %d", | |
626 | from_nodeid, r->res_master_nodeid); | |
627 | dlm_print_rsb(r); | |
628 | /* fix it and go on */ | |
629 | r->res_master_nodeid = our_nodeid; | |
630 | r->res_nodeid = 0; | |
e7fd4179 DT |
631 | rsb_clear_flag(r, RSB_MASTER_UNCERTAIN); |
632 | r->res_first_lkid = 0; | |
c04fecb4 DT |
633 | } |
634 | ||
635 | if (from_local && (r->res_master_nodeid != our_nodeid)) { | |
636 | /* Because we have held no locks on this rsb, | |
637 | res_master_nodeid could have become stale. */ | |
e7fd4179 DT |
638 | rsb_set_flag(r, RSB_MASTER_UNCERTAIN); |
639 | r->res_first_lkid = 0; | |
c04fecb4 DT |
640 | } |
641 | ||
642 | rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[b].toss); | |
643 | error = rsb_insert(r, &ls->ls_rsbtbl[b].keep); | |
644 | goto out_unlock; | |
645 | ||
646 | ||
647 | do_new: | |
648 | /* | |
649 | * rsb not found | |
650 | */ | |
651 | ||
652 | if (error == -EBADR && !create) | |
653 | goto out_unlock; | |
654 | ||
655 | error = get_rsb_struct(ls, name, len, &r); | |
656 | if (error == -EAGAIN) { | |
657 | spin_unlock(&ls->ls_rsbtbl[b].lock); | |
658 | goto retry; | |
659 | } | |
660 | if (error) | |
661 | goto out_unlock; | |
662 | ||
663 | r->res_hash = hash; | |
664 | r->res_bucket = b; | |
665 | r->res_dir_nodeid = dir_nodeid; | |
666 | kref_init(&r->res_ref); | |
667 | ||
668 | if (from_dir) { | |
669 | /* want to see how often this happens */ | |
670 | log_debug(ls, "find_rsb new from_dir %d recreate %s", | |
671 | from_nodeid, r->res_name); | |
672 | r->res_master_nodeid = our_nodeid; | |
673 | r->res_nodeid = 0; | |
674 | goto out_add; | |
675 | } | |
676 | ||
677 | if (from_other && (dir_nodeid != our_nodeid)) { | |
678 | /* should never happen */ | |
679 | log_error(ls, "find_rsb new from_other %d dir %d our %d %s", | |
680 | from_nodeid, dir_nodeid, our_nodeid, r->res_name); | |
681 | dlm_free_rsb(r); | |
e8243f32 | 682 | r = NULL; |
c04fecb4 DT |
683 | error = -ENOTBLK; |
684 | goto out_unlock; | |
685 | } | |
686 | ||
687 | if (from_other) { | |
688 | log_debug(ls, "find_rsb new from_other %d dir %d %s", | |
689 | from_nodeid, dir_nodeid, r->res_name); | |
690 | } | |
691 | ||
692 | if (dir_nodeid == our_nodeid) { | |
693 | /* When we are the dir nodeid, we can set the master | |
694 | node immediately */ | |
695 | r->res_master_nodeid = our_nodeid; | |
696 | r->res_nodeid = 0; | |
e7fd4179 | 697 | } else { |
c04fecb4 DT |
698 | /* set_master will send_lookup to dir_nodeid */ |
699 | r->res_master_nodeid = 0; | |
700 | r->res_nodeid = -1; | |
701 | } | |
702 | ||
703 | out_add: | |
704 | error = rsb_insert(r, &ls->ls_rsbtbl[b].keep); | |
705 | out_unlock: | |
706 | spin_unlock(&ls->ls_rsbtbl[b].lock); | |
707 | out: | |
708 | *r_ret = r; | |
709 | return error; | |
710 | } | |
711 | ||
712 | /* During recovery, other nodes can send us new MSTCPY locks (from | |
713 | dlm_recover_locks) before we've made ourself master (in | |
714 | dlm_recover_masters). */ | |
715 | ||
56171e0d | 716 | static int find_rsb_nodir(struct dlm_ls *ls, const void *name, int len, |
c04fecb4 DT |
717 | uint32_t hash, uint32_t b, |
718 | int dir_nodeid, int from_nodeid, | |
719 | unsigned int flags, struct dlm_rsb **r_ret) | |
720 | { | |
721 | struct dlm_rsb *r = NULL; | |
722 | int our_nodeid = dlm_our_nodeid(); | |
723 | int recover = (flags & R_RECEIVE_RECOVER); | |
724 | int error; | |
725 | ||
726 | retry: | |
727 | error = pre_rsb_struct(ls); | |
728 | if (error < 0) | |
729 | goto out; | |
730 | ||
731 | spin_lock(&ls->ls_rsbtbl[b].lock); | |
732 | ||
733 | error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].keep, name, len, &r); | |
734 | if (error) | |
735 | goto do_toss; | |
736 | ||
737 | /* | |
738 | * rsb is active, so we can't check master_nodeid without lock_rsb. | |
739 | */ | |
740 | ||
741 | kref_get(&r->res_ref); | |
742 | goto out_unlock; | |
743 | ||
744 | ||
745 | do_toss: | |
746 | error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].toss, name, len, &r); | |
747 | if (error) | |
748 | goto do_new; | |
749 | ||
750 | /* | |
751 | * rsb found inactive. No other thread is using this rsb because | |
752 | * it's on the toss list, so we can look at or update | |
753 | * res_master_nodeid without lock_rsb. | |
754 | */ | |
755 | ||
756 | if (!recover && (r->res_master_nodeid != our_nodeid) && from_nodeid) { | |
757 | /* our rsb is not master, and another node has sent us a | |
758 | request; this should never happen */ | |
759 | log_error(ls, "find_rsb toss from_nodeid %d master %d dir %d", | |
760 | from_nodeid, r->res_master_nodeid, dir_nodeid); | |
761 | dlm_print_rsb(r); | |
762 | error = -ENOTBLK; | |
763 | goto out_unlock; | |
e7fd4179 | 764 | } |
c04fecb4 DT |
765 | |
766 | if (!recover && (r->res_master_nodeid != our_nodeid) && | |
767 | (dir_nodeid == our_nodeid)) { | |
768 | /* our rsb is not master, and we are dir; may as well fix it; | |
769 | this should never happen */ | |
770 | log_error(ls, "find_rsb toss our %d master %d dir %d", | |
771 | our_nodeid, r->res_master_nodeid, dir_nodeid); | |
772 | dlm_print_rsb(r); | |
773 | r->res_master_nodeid = our_nodeid; | |
774 | r->res_nodeid = 0; | |
775 | } | |
776 | ||
777 | rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[b].toss); | |
778 | error = rsb_insert(r, &ls->ls_rsbtbl[b].keep); | |
779 | goto out_unlock; | |
780 | ||
781 | ||
782 | do_new: | |
783 | /* | |
784 | * rsb not found | |
785 | */ | |
786 | ||
787 | error = get_rsb_struct(ls, name, len, &r); | |
788 | if (error == -EAGAIN) { | |
789 | spin_unlock(&ls->ls_rsbtbl[b].lock); | |
790 | goto retry; | |
791 | } | |
792 | if (error) | |
793 | goto out_unlock; | |
794 | ||
795 | r->res_hash = hash; | |
796 | r->res_bucket = b; | |
797 | r->res_dir_nodeid = dir_nodeid; | |
798 | r->res_master_nodeid = dir_nodeid; | |
799 | r->res_nodeid = (dir_nodeid == our_nodeid) ? 0 : dir_nodeid; | |
800 | kref_init(&r->res_ref); | |
801 | ||
802 | error = rsb_insert(r, &ls->ls_rsbtbl[b].keep); | |
803 | out_unlock: | |
804 | spin_unlock(&ls->ls_rsbtbl[b].lock); | |
e7fd4179 DT |
805 | out: |
806 | *r_ret = r; | |
807 | return error; | |
808 | } | |
809 | ||
56171e0d AA |
810 | static int find_rsb(struct dlm_ls *ls, const void *name, int len, |
811 | int from_nodeid, unsigned int flags, | |
812 | struct dlm_rsb **r_ret) | |
c04fecb4 DT |
813 | { |
814 | uint32_t hash, b; | |
815 | int dir_nodeid; | |
816 | ||
817 | if (len > DLM_RESNAME_MAXLEN) | |
818 | return -EINVAL; | |
819 | ||
820 | hash = jhash(name, len, 0); | |
821 | b = hash & (ls->ls_rsbtbl_size - 1); | |
822 | ||
823 | dir_nodeid = dlm_hash2nodeid(ls, hash); | |
824 | ||
825 | if (dlm_no_directory(ls)) | |
826 | return find_rsb_nodir(ls, name, len, hash, b, dir_nodeid, | |
827 | from_nodeid, flags, r_ret); | |
828 | else | |
829 | return find_rsb_dir(ls, name, len, hash, b, dir_nodeid, | |
830 | from_nodeid, flags, r_ret); | |
831 | } | |
832 | ||
833 | /* we have received a request and found that res_master_nodeid != our_nodeid, | |
834 | so we need to return an error or make ourself the master */ | |
835 | ||
836 | static int validate_master_nodeid(struct dlm_ls *ls, struct dlm_rsb *r, | |
837 | int from_nodeid) | |
838 | { | |
839 | if (dlm_no_directory(ls)) { | |
840 | log_error(ls, "find_rsb keep from_nodeid %d master %d dir %d", | |
841 | from_nodeid, r->res_master_nodeid, | |
842 | r->res_dir_nodeid); | |
843 | dlm_print_rsb(r); | |
844 | return -ENOTBLK; | |
845 | } | |
846 | ||
847 | if (from_nodeid != r->res_dir_nodeid) { | |
848 | /* our rsb is not master, and another node (not the dir node) | |
849 | has sent us a request. this is much more common when our | |
850 | master_nodeid is zero, so limit debug to non-zero. */ | |
851 | ||
852 | if (r->res_master_nodeid) { | |
853 | log_debug(ls, "validate master from_other %d master %d " | |
854 | "dir %d first %x %s", from_nodeid, | |
855 | r->res_master_nodeid, r->res_dir_nodeid, | |
856 | r->res_first_lkid, r->res_name); | |
857 | } | |
858 | return -ENOTBLK; | |
859 | } else { | |
860 | /* our rsb is not master, but the dir nodeid has sent us a | |
861 | request; this could happen with master 0 / res_nodeid -1 */ | |
862 | ||
863 | if (r->res_master_nodeid) { | |
864 | log_error(ls, "validate master from_dir %d master %d " | |
865 | "first %x %s", | |
866 | from_nodeid, r->res_master_nodeid, | |
867 | r->res_first_lkid, r->res_name); | |
868 | } | |
869 | ||
870 | r->res_master_nodeid = dlm_our_nodeid(); | |
871 | r->res_nodeid = 0; | |
872 | return 0; | |
873 | } | |
874 | } | |
875 | ||
40159748 AA |
876 | static void __dlm_master_lookup(struct dlm_ls *ls, struct dlm_rsb *r, int our_nodeid, |
877 | int from_nodeid, bool toss_list, unsigned int flags, | |
878 | int *r_nodeid, int *result) | |
879 | { | |
880 | int fix_master = (flags & DLM_LU_RECOVER_MASTER); | |
881 | int from_master = (flags & DLM_LU_RECOVER_DIR); | |
882 | ||
883 | if (r->res_dir_nodeid != our_nodeid) { | |
884 | /* should not happen, but may as well fix it and carry on */ | |
885 | log_error(ls, "%s res_dir %d our %d %s", __func__, | |
886 | r->res_dir_nodeid, our_nodeid, r->res_name); | |
887 | r->res_dir_nodeid = our_nodeid; | |
888 | } | |
889 | ||
890 | if (fix_master && dlm_is_removed(ls, r->res_master_nodeid)) { | |
891 | /* Recovery uses this function to set a new master when | |
892 | * the previous master failed. Setting NEW_MASTER will | |
893 | * force dlm_recover_masters to call recover_master on this | |
894 | * rsb even though the res_nodeid is no longer removed. | |
895 | */ | |
896 | ||
897 | r->res_master_nodeid = from_nodeid; | |
898 | r->res_nodeid = from_nodeid; | |
899 | rsb_set_flag(r, RSB_NEW_MASTER); | |
900 | ||
901 | if (toss_list) { | |
902 | /* I don't think we should ever find it on toss list. */ | |
903 | log_error(ls, "%s fix_master on toss", __func__); | |
904 | dlm_dump_rsb(r); | |
905 | } | |
906 | } | |
907 | ||
908 | if (from_master && (r->res_master_nodeid != from_nodeid)) { | |
909 | /* this will happen if from_nodeid became master during | |
910 | * a previous recovery cycle, and we aborted the previous | |
911 | * cycle before recovering this master value | |
912 | */ | |
913 | ||
914 | log_limit(ls, "%s from_master %d master_nodeid %d res_nodeid %d first %x %s", | |
915 | __func__, from_nodeid, r->res_master_nodeid, | |
916 | r->res_nodeid, r->res_first_lkid, r->res_name); | |
917 | ||
918 | if (r->res_master_nodeid == our_nodeid) { | |
919 | log_error(ls, "from_master %d our_master", from_nodeid); | |
920 | dlm_dump_rsb(r); | |
921 | goto ret_assign; | |
922 | } | |
923 | ||
924 | r->res_master_nodeid = from_nodeid; | |
925 | r->res_nodeid = from_nodeid; | |
926 | rsb_set_flag(r, RSB_NEW_MASTER); | |
927 | } | |
928 | ||
929 | if (!r->res_master_nodeid) { | |
930 | /* this will happen if recovery happens while we're looking | |
931 | * up the master for this rsb | |
932 | */ | |
933 | ||
934 | log_debug(ls, "%s master 0 to %d first %x %s", __func__, | |
935 | from_nodeid, r->res_first_lkid, r->res_name); | |
936 | r->res_master_nodeid = from_nodeid; | |
937 | r->res_nodeid = from_nodeid; | |
938 | } | |
939 | ||
940 | if (!from_master && !fix_master && | |
941 | (r->res_master_nodeid == from_nodeid)) { | |
942 | /* this can happen when the master sends remove, the dir node | |
943 | * finds the rsb on the keep list and ignores the remove, | |
944 | * and the former master sends a lookup | |
945 | */ | |
946 | ||
947 | log_limit(ls, "%s from master %d flags %x first %x %s", | |
948 | __func__, from_nodeid, flags, r->res_first_lkid, | |
949 | r->res_name); | |
950 | } | |
951 | ||
952 | ret_assign: | |
953 | *r_nodeid = r->res_master_nodeid; | |
954 | if (result) | |
955 | *result = DLM_LU_MATCH; | |
956 | } | |
957 | ||
e7fd4179 | 958 | /* |
c04fecb4 DT |
959 | * We're the dir node for this res and another node wants to know the |
960 | * master nodeid. During normal operation (non recovery) this is only | |
961 | * called from receive_lookup(); master lookups when the local node is | |
962 | * the dir node are done by find_rsb(). | |
e7fd4179 | 963 | * |
c04fecb4 DT |
964 | * normal operation, we are the dir node for a resource |
965 | * . _request_lock | |
966 | * . set_master | |
967 | * . send_lookup | |
968 | * . receive_lookup | |
969 | * . dlm_master_lookup flags 0 | |
e7fd4179 | 970 | * |
c04fecb4 DT |
971 | * recover directory, we are rebuilding dir for all resources |
972 | * . dlm_recover_directory | |
973 | * . dlm_rcom_names | |
974 | * remote node sends back the rsb names it is master of and we are dir of | |
975 | * . dlm_master_lookup RECOVER_DIR (fix_master 0, from_master 1) | |
976 | * we either create new rsb setting remote node as master, or find existing | |
977 | * rsb and set master to be the remote node. | |
978 | * | |
979 | * recover masters, we are finding the new master for resources | |
980 | * . dlm_recover_masters | |
981 | * . recover_master | |
982 | * . dlm_send_rcom_lookup | |
983 | * . receive_rcom_lookup | |
984 | * . dlm_master_lookup RECOVER_MASTER (fix_master 1, from_master 0) | |
e7fd4179 DT |
985 | */ |
986 | ||
c04fecb4 DT |
987 | int dlm_master_lookup(struct dlm_ls *ls, int from_nodeid, char *name, int len, |
988 | unsigned int flags, int *r_nodeid, int *result) | |
e7fd4179 | 989 | { |
3881ac04 | 990 | struct dlm_rsb *r = NULL; |
c04fecb4 | 991 | uint32_t hash, b; |
c04fecb4 | 992 | int our_nodeid = dlm_our_nodeid(); |
40159748 | 993 | int dir_nodeid, error; |
ef58bcca | 994 | |
c04fecb4 DT |
995 | if (len > DLM_RESNAME_MAXLEN) |
996 | return -EINVAL; | |
997 | ||
998 | if (from_nodeid == our_nodeid) { | |
999 | log_error(ls, "dlm_master_lookup from our_nodeid %d flags %x", | |
1000 | our_nodeid, flags); | |
1001 | return -EINVAL; | |
3881ac04 | 1002 | } |
e7fd4179 | 1003 | |
c04fecb4 DT |
1004 | hash = jhash(name, len, 0); |
1005 | b = hash & (ls->ls_rsbtbl_size - 1); | |
e7fd4179 | 1006 | |
c04fecb4 DT |
1007 | dir_nodeid = dlm_hash2nodeid(ls, hash); |
1008 | if (dir_nodeid != our_nodeid) { | |
1009 | log_error(ls, "dlm_master_lookup from %d dir %d our %d h %x %d", | |
1010 | from_nodeid, dir_nodeid, our_nodeid, hash, | |
1011 | ls->ls_num_nodes); | |
1012 | *r_nodeid = -1; | |
1013 | return -EINVAL; | |
1014 | } | |
e7fd4179 | 1015 | |
3881ac04 | 1016 | retry: |
c04fecb4 DT |
1017 | error = pre_rsb_struct(ls); |
1018 | if (error < 0) | |
1019 | return error; | |
1020 | ||
1021 | spin_lock(&ls->ls_rsbtbl[b].lock); | |
1022 | error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].keep, name, len, &r); | |
1023 | if (!error) { | |
1024 | /* because the rsb is active, we need to lock_rsb before | |
40159748 AA |
1025 | * checking/changing re_master_nodeid |
1026 | */ | |
c04fecb4 DT |
1027 | |
1028 | hold_rsb(r); | |
1029 | spin_unlock(&ls->ls_rsbtbl[b].lock); | |
1030 | lock_rsb(r); | |
e7fd4179 | 1031 | |
40159748 AA |
1032 | __dlm_master_lookup(ls, r, our_nodeid, from_nodeid, false, |
1033 | flags, r_nodeid, result); | |
c04fecb4 | 1034 | |
40159748 AA |
1035 | /* the rsb was active */ |
1036 | unlock_rsb(r); | |
1037 | put_rsb(r); | |
c04fecb4 | 1038 | |
40159748 | 1039 | return 0; |
c04fecb4 DT |
1040 | } |
1041 | ||
40159748 AA |
1042 | error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].toss, name, len, &r); |
1043 | if (error) | |
1044 | goto not_found; | |
c04fecb4 | 1045 | |
40159748 AA |
1046 | /* because the rsb is inactive (on toss list), it's not refcounted |
1047 | * and lock_rsb is not used, but is protected by the rsbtbl lock | |
1048 | */ | |
c04fecb4 | 1049 | |
40159748 AA |
1050 | __dlm_master_lookup(ls, r, our_nodeid, from_nodeid, true, flags, |
1051 | r_nodeid, result); | |
c04fecb4 | 1052 | |
40159748 AA |
1053 | r->res_toss_time = jiffies; |
1054 | /* the rsb was inactive (on toss list) */ | |
1055 | spin_unlock(&ls->ls_rsbtbl[b].lock); | |
c04fecb4 | 1056 | |
c04fecb4 | 1057 | return 0; |
e7fd4179 | 1058 | |
c04fecb4 DT |
1059 | not_found: |
1060 | error = get_rsb_struct(ls, name, len, &r); | |
3881ac04 | 1061 | if (error == -EAGAIN) { |
c04fecb4 | 1062 | spin_unlock(&ls->ls_rsbtbl[b].lock); |
3881ac04 DT |
1063 | goto retry; |
1064 | } | |
1065 | if (error) | |
1066 | goto out_unlock; | |
e7fd4179 DT |
1067 | |
1068 | r->res_hash = hash; | |
c04fecb4 DT |
1069 | r->res_bucket = b; |
1070 | r->res_dir_nodeid = our_nodeid; | |
1071 | r->res_master_nodeid = from_nodeid; | |
1072 | r->res_nodeid = from_nodeid; | |
e7fd4179 | 1073 | kref_init(&r->res_ref); |
c04fecb4 | 1074 | r->res_toss_time = jiffies; |
e7fd4179 | 1075 | |
c04fecb4 DT |
1076 | error = rsb_insert(r, &ls->ls_rsbtbl[b].toss); |
1077 | if (error) { | |
1078 | /* should never happen */ | |
1079 | dlm_free_rsb(r); | |
1080 | spin_unlock(&ls->ls_rsbtbl[b].lock); | |
1081 | goto retry; | |
e7fd4179 | 1082 | } |
c04fecb4 DT |
1083 | |
1084 | if (result) | |
1085 | *result = DLM_LU_ADD; | |
1086 | *r_nodeid = from_nodeid; | |
3881ac04 | 1087 | out_unlock: |
c04fecb4 | 1088 | spin_unlock(&ls->ls_rsbtbl[b].lock); |
e7fd4179 DT |
1089 | return error; |
1090 | } | |
1091 | ||
6d40c4a7 DT |
1092 | static void dlm_dump_rsb_hash(struct dlm_ls *ls, uint32_t hash) |
1093 | { | |
1094 | struct rb_node *n; | |
1095 | struct dlm_rsb *r; | |
1096 | int i; | |
1097 | ||
1098 | for (i = 0; i < ls->ls_rsbtbl_size; i++) { | |
1099 | spin_lock(&ls->ls_rsbtbl[i].lock); | |
1100 | for (n = rb_first(&ls->ls_rsbtbl[i].keep); n; n = rb_next(n)) { | |
1101 | r = rb_entry(n, struct dlm_rsb, res_hashnode); | |
1102 | if (r->res_hash == hash) | |
1103 | dlm_dump_rsb(r); | |
1104 | } | |
1105 | spin_unlock(&ls->ls_rsbtbl[i].lock); | |
1106 | } | |
1107 | } | |
1108 | ||
c04fecb4 | 1109 | void dlm_dump_rsb_name(struct dlm_ls *ls, char *name, int len) |
e7fd4179 | 1110 | { |
c04fecb4 DT |
1111 | struct dlm_rsb *r = NULL; |
1112 | uint32_t hash, b; | |
1113 | int error; | |
e7fd4179 | 1114 | |
c04fecb4 DT |
1115 | hash = jhash(name, len, 0); |
1116 | b = hash & (ls->ls_rsbtbl_size - 1); | |
1117 | ||
1118 | spin_lock(&ls->ls_rsbtbl[b].lock); | |
1119 | error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].keep, name, len, &r); | |
1120 | if (!error) | |
1121 | goto out_dump; | |
1122 | ||
1123 | error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].toss, name, len, &r); | |
1124 | if (error) | |
1125 | goto out; | |
1126 | out_dump: | |
1127 | dlm_dump_rsb(r); | |
1128 | out: | |
1129 | spin_unlock(&ls->ls_rsbtbl[b].lock); | |
e7fd4179 DT |
1130 | } |
1131 | ||
1132 | static void toss_rsb(struct kref *kref) | |
1133 | { | |
1134 | struct dlm_rsb *r = container_of(kref, struct dlm_rsb, res_ref); | |
1135 | struct dlm_ls *ls = r->res_ls; | |
1136 | ||
1137 | DLM_ASSERT(list_empty(&r->res_root_list), dlm_print_rsb(r);); | |
1138 | kref_init(&r->res_ref); | |
9beb3bf5 BP |
1139 | rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[r->res_bucket].keep); |
1140 | rsb_insert(r, &ls->ls_rsbtbl[r->res_bucket].toss); | |
e7fd4179 | 1141 | r->res_toss_time = jiffies; |
46d6e722 | 1142 | set_bit(DLM_RTF_SHRINK_BIT, &ls->ls_rsbtbl[r->res_bucket].flags); |
e7fd4179 | 1143 | if (r->res_lvbptr) { |
52bda2b5 | 1144 | dlm_free_lvb(r->res_lvbptr); |
e7fd4179 DT |
1145 | r->res_lvbptr = NULL; |
1146 | } | |
1147 | } | |
1148 | ||
e7fd4179 DT |
1149 | /* See comment for unhold_lkb */ |
1150 | ||
1151 | static void unhold_rsb(struct dlm_rsb *r) | |
1152 | { | |
1153 | int rv; | |
1154 | rv = kref_put(&r->res_ref, toss_rsb); | |
a345da3e | 1155 | DLM_ASSERT(!rv, dlm_dump_rsb(r);); |
e7fd4179 DT |
1156 | } |
1157 | ||
1158 | static void kill_rsb(struct kref *kref) | |
1159 | { | |
1160 | struct dlm_rsb *r = container_of(kref, struct dlm_rsb, res_ref); | |
1161 | ||
1162 | /* All work is done after the return from kref_put() so we | |
1163 | can release the write_lock before the remove and free. */ | |
1164 | ||
a345da3e DT |
1165 | DLM_ASSERT(list_empty(&r->res_lookup), dlm_dump_rsb(r);); |
1166 | DLM_ASSERT(list_empty(&r->res_grantqueue), dlm_dump_rsb(r);); | |
1167 | DLM_ASSERT(list_empty(&r->res_convertqueue), dlm_dump_rsb(r);); | |
1168 | DLM_ASSERT(list_empty(&r->res_waitqueue), dlm_dump_rsb(r);); | |
1169 | DLM_ASSERT(list_empty(&r->res_root_list), dlm_dump_rsb(r);); | |
1170 | DLM_ASSERT(list_empty(&r->res_recover_list), dlm_dump_rsb(r);); | |
e7fd4179 DT |
1171 | } |
1172 | ||
1173 | /* Attaching/detaching lkb's from rsb's is for rsb reference counting. | |
1174 | The rsb must exist as long as any lkb's for it do. */ | |
1175 | ||
1176 | static void attach_lkb(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1177 | { | |
1178 | hold_rsb(r); | |
1179 | lkb->lkb_resource = r; | |
1180 | } | |
1181 | ||
1182 | static void detach_lkb(struct dlm_lkb *lkb) | |
1183 | { | |
1184 | if (lkb->lkb_resource) { | |
1185 | put_rsb(lkb->lkb_resource); | |
1186 | lkb->lkb_resource = NULL; | |
1187 | } | |
1188 | } | |
1189 | ||
75d25ffe AA |
1190 | static int _create_lkb(struct dlm_ls *ls, struct dlm_lkb **lkb_ret, |
1191 | int start, int end) | |
e7fd4179 | 1192 | { |
3d6aa675 | 1193 | struct dlm_lkb *lkb; |
2a86b3e7 | 1194 | int rv; |
e7fd4179 | 1195 | |
52bda2b5 | 1196 | lkb = dlm_allocate_lkb(ls); |
e7fd4179 DT |
1197 | if (!lkb) |
1198 | return -ENOMEM; | |
1199 | ||
61bed0ba | 1200 | lkb->lkb_last_bast_mode = -1; |
e7fd4179 DT |
1201 | lkb->lkb_nodeid = -1; |
1202 | lkb->lkb_grmode = DLM_LOCK_IV; | |
1203 | kref_init(&lkb->lkb_ref); | |
34e22bed | 1204 | INIT_LIST_HEAD(&lkb->lkb_ownqueue); |
ef0c2bb0 | 1205 | INIT_LIST_HEAD(&lkb->lkb_rsb_lookup); |
23e8e1aa | 1206 | INIT_LIST_HEAD(&lkb->lkb_cb_list); |
61bed0ba | 1207 | INIT_LIST_HEAD(&lkb->lkb_callbacks); |
92e95733 | 1208 | spin_lock_init(&lkb->lkb_cb_lock); |
23e8e1aa | 1209 | INIT_WORK(&lkb->lkb_cb_work, dlm_callback_work); |
e7fd4179 | 1210 | |
2a86b3e7 | 1211 | idr_preload(GFP_NOFS); |
3d6aa675 | 1212 | spin_lock(&ls->ls_lkbidr_spin); |
75d25ffe | 1213 | rv = idr_alloc(&ls->ls_lkbidr, lkb, start, end, GFP_NOWAIT); |
2a86b3e7 TH |
1214 | if (rv >= 0) |
1215 | lkb->lkb_id = rv; | |
3d6aa675 | 1216 | spin_unlock(&ls->ls_lkbidr_spin); |
2a86b3e7 | 1217 | idr_preload_end(); |
e7fd4179 | 1218 | |
3d6aa675 DT |
1219 | if (rv < 0) { |
1220 | log_error(ls, "create_lkb idr error %d", rv); | |
23851e97 | 1221 | dlm_free_lkb(lkb); |
3d6aa675 | 1222 | return rv; |
e7fd4179 DT |
1223 | } |
1224 | ||
e7fd4179 DT |
1225 | *lkb_ret = lkb; |
1226 | return 0; | |
1227 | } | |
1228 | ||
75d25ffe AA |
1229 | static int create_lkb(struct dlm_ls *ls, struct dlm_lkb **lkb_ret) |
1230 | { | |
1231 | return _create_lkb(ls, lkb_ret, 1, 0); | |
1232 | } | |
1233 | ||
e7fd4179 DT |
1234 | static int find_lkb(struct dlm_ls *ls, uint32_t lkid, struct dlm_lkb **lkb_ret) |
1235 | { | |
1236 | struct dlm_lkb *lkb; | |
e7fd4179 | 1237 | |
3d6aa675 DT |
1238 | spin_lock(&ls->ls_lkbidr_spin); |
1239 | lkb = idr_find(&ls->ls_lkbidr, lkid); | |
e7fd4179 DT |
1240 | if (lkb) |
1241 | kref_get(&lkb->lkb_ref); | |
3d6aa675 | 1242 | spin_unlock(&ls->ls_lkbidr_spin); |
e7fd4179 DT |
1243 | |
1244 | *lkb_ret = lkb; | |
1245 | return lkb ? 0 : -ENOENT; | |
1246 | } | |
1247 | ||
1248 | static void kill_lkb(struct kref *kref) | |
1249 | { | |
1250 | struct dlm_lkb *lkb = container_of(kref, struct dlm_lkb, lkb_ref); | |
1251 | ||
1252 | /* All work is done after the return from kref_put() so we | |
1253 | can release the write_lock before the detach_lkb */ | |
1254 | ||
1255 | DLM_ASSERT(!lkb->lkb_status, dlm_print_lkb(lkb);); | |
1256 | } | |
1257 | ||
b3f58d8f DT |
1258 | /* __put_lkb() is used when an lkb may not have an rsb attached to |
1259 | it so we need to provide the lockspace explicitly */ | |
1260 | ||
1261 | static int __put_lkb(struct dlm_ls *ls, struct dlm_lkb *lkb) | |
e7fd4179 | 1262 | { |
3d6aa675 | 1263 | uint32_t lkid = lkb->lkb_id; |
8e51ec61 | 1264 | int rv; |
e7fd4179 | 1265 | |
8e51ec61 AA |
1266 | rv = kref_put_lock(&lkb->lkb_ref, kill_lkb, |
1267 | &ls->ls_lkbidr_spin); | |
1268 | if (rv) { | |
3d6aa675 DT |
1269 | idr_remove(&ls->ls_lkbidr, lkid); |
1270 | spin_unlock(&ls->ls_lkbidr_spin); | |
e7fd4179 DT |
1271 | |
1272 | detach_lkb(lkb); | |
1273 | ||
1274 | /* for local/process lkbs, lvbptr points to caller's lksb */ | |
1275 | if (lkb->lkb_lvbptr && is_master_copy(lkb)) | |
52bda2b5 DT |
1276 | dlm_free_lvb(lkb->lkb_lvbptr); |
1277 | dlm_free_lkb(lkb); | |
e7fd4179 | 1278 | } |
8e51ec61 AA |
1279 | |
1280 | return rv; | |
e7fd4179 DT |
1281 | } |
1282 | ||
1283 | int dlm_put_lkb(struct dlm_lkb *lkb) | |
1284 | { | |
b3f58d8f DT |
1285 | struct dlm_ls *ls; |
1286 | ||
1287 | DLM_ASSERT(lkb->lkb_resource, dlm_print_lkb(lkb);); | |
1288 | DLM_ASSERT(lkb->lkb_resource->res_ls, dlm_print_lkb(lkb);); | |
1289 | ||
1290 | ls = lkb->lkb_resource->res_ls; | |
1291 | return __put_lkb(ls, lkb); | |
e7fd4179 DT |
1292 | } |
1293 | ||
1294 | /* This is only called to add a reference when the code already holds | |
1295 | a valid reference to the lkb, so there's no need for locking. */ | |
1296 | ||
1297 | static inline void hold_lkb(struct dlm_lkb *lkb) | |
1298 | { | |
1299 | kref_get(&lkb->lkb_ref); | |
1300 | } | |
1301 | ||
95858989 AA |
1302 | static void unhold_lkb_assert(struct kref *kref) |
1303 | { | |
1304 | struct dlm_lkb *lkb = container_of(kref, struct dlm_lkb, lkb_ref); | |
1305 | ||
1306 | DLM_ASSERT(false, dlm_print_lkb(lkb);); | |
1307 | } | |
1308 | ||
e7fd4179 DT |
1309 | /* This is called when we need to remove a reference and are certain |
1310 | it's not the last ref. e.g. del_lkb is always called between a | |
1311 | find_lkb/put_lkb and is always the inverse of a previous add_lkb. | |
1312 | put_lkb would work fine, but would involve unnecessary locking */ | |
1313 | ||
1314 | static inline void unhold_lkb(struct dlm_lkb *lkb) | |
1315 | { | |
95858989 | 1316 | kref_put(&lkb->lkb_ref, unhold_lkb_assert); |
e7fd4179 DT |
1317 | } |
1318 | ||
1319 | static void lkb_add_ordered(struct list_head *new, struct list_head *head, | |
1320 | int mode) | |
1321 | { | |
c490b3af | 1322 | struct dlm_lkb *lkb = NULL, *iter; |
e7fd4179 | 1323 | |
c490b3af JK |
1324 | list_for_each_entry(iter, head, lkb_statequeue) |
1325 | if (iter->lkb_rqmode < mode) { | |
1326 | lkb = iter; | |
1327 | list_add_tail(new, &iter->lkb_statequeue); | |
e7fd4179 | 1328 | break; |
c490b3af | 1329 | } |
e7fd4179 | 1330 | |
c490b3af JK |
1331 | if (!lkb) |
1332 | list_add_tail(new, head); | |
e7fd4179 DT |
1333 | } |
1334 | ||
1335 | /* add/remove lkb to rsb's grant/convert/wait queue */ | |
1336 | ||
1337 | static void add_lkb(struct dlm_rsb *r, struct dlm_lkb *lkb, int status) | |
1338 | { | |
1339 | kref_get(&lkb->lkb_ref); | |
1340 | ||
1341 | DLM_ASSERT(!lkb->lkb_status, dlm_print_lkb(lkb);); | |
1342 | ||
eeda418d DT |
1343 | lkb->lkb_timestamp = ktime_get(); |
1344 | ||
e7fd4179 DT |
1345 | lkb->lkb_status = status; |
1346 | ||
1347 | switch (status) { | |
1348 | case DLM_LKSTS_WAITING: | |
1349 | if (lkb->lkb_exflags & DLM_LKF_HEADQUE) | |
1350 | list_add(&lkb->lkb_statequeue, &r->res_waitqueue); | |
1351 | else | |
1352 | list_add_tail(&lkb->lkb_statequeue, &r->res_waitqueue); | |
1353 | break; | |
1354 | case DLM_LKSTS_GRANTED: | |
1355 | /* convention says granted locks kept in order of grmode */ | |
1356 | lkb_add_ordered(&lkb->lkb_statequeue, &r->res_grantqueue, | |
1357 | lkb->lkb_grmode); | |
1358 | break; | |
1359 | case DLM_LKSTS_CONVERT: | |
1360 | if (lkb->lkb_exflags & DLM_LKF_HEADQUE) | |
1361 | list_add(&lkb->lkb_statequeue, &r->res_convertqueue); | |
1362 | else | |
1363 | list_add_tail(&lkb->lkb_statequeue, | |
1364 | &r->res_convertqueue); | |
1365 | break; | |
1366 | default: | |
1367 | DLM_ASSERT(0, dlm_print_lkb(lkb); printk("sts=%d\n", status);); | |
1368 | } | |
1369 | } | |
1370 | ||
1371 | static void del_lkb(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1372 | { | |
1373 | lkb->lkb_status = 0; | |
1374 | list_del(&lkb->lkb_statequeue); | |
1375 | unhold_lkb(lkb); | |
1376 | } | |
1377 | ||
1378 | static void move_lkb(struct dlm_rsb *r, struct dlm_lkb *lkb, int sts) | |
1379 | { | |
1380 | hold_lkb(lkb); | |
1381 | del_lkb(r, lkb); | |
1382 | add_lkb(r, lkb, sts); | |
1383 | unhold_lkb(lkb); | |
1384 | } | |
1385 | ||
ef0c2bb0 DT |
1386 | static int msg_reply_type(int mstype) |
1387 | { | |
1388 | switch (mstype) { | |
1389 | case DLM_MSG_REQUEST: | |
1390 | return DLM_MSG_REQUEST_REPLY; | |
1391 | case DLM_MSG_CONVERT: | |
1392 | return DLM_MSG_CONVERT_REPLY; | |
1393 | case DLM_MSG_UNLOCK: | |
1394 | return DLM_MSG_UNLOCK_REPLY; | |
1395 | case DLM_MSG_CANCEL: | |
1396 | return DLM_MSG_CANCEL_REPLY; | |
1397 | case DLM_MSG_LOOKUP: | |
1398 | return DLM_MSG_LOOKUP_REPLY; | |
1399 | } | |
1400 | return -1; | |
1401 | } | |
1402 | ||
e7fd4179 DT |
1403 | /* add/remove lkb from global waiters list of lkb's waiting for |
1404 | a reply from a remote node */ | |
1405 | ||
c6ff669b | 1406 | static int add_to_waiters(struct dlm_lkb *lkb, int mstype, int to_nodeid) |
e7fd4179 DT |
1407 | { |
1408 | struct dlm_ls *ls = lkb->lkb_resource->res_ls; | |
ef0c2bb0 | 1409 | int error = 0; |
e7fd4179 | 1410 | |
90135925 | 1411 | mutex_lock(&ls->ls_waiters_mutex); |
ef0c2bb0 DT |
1412 | |
1413 | if (is_overlap_unlock(lkb) || | |
1414 | (is_overlap_cancel(lkb) && (mstype == DLM_MSG_CANCEL))) { | |
1415 | error = -EINVAL; | |
1416 | goto out; | |
1417 | } | |
1418 | ||
1419 | if (lkb->lkb_wait_type || is_overlap_cancel(lkb)) { | |
1420 | switch (mstype) { | |
1421 | case DLM_MSG_UNLOCK: | |
e1af8728 | 1422 | set_bit(DLM_IFL_OVERLAP_UNLOCK_BIT, &lkb->lkb_iflags); |
ef0c2bb0 DT |
1423 | break; |
1424 | case DLM_MSG_CANCEL: | |
e1af8728 | 1425 | set_bit(DLM_IFL_OVERLAP_CANCEL_BIT, &lkb->lkb_iflags); |
ef0c2bb0 DT |
1426 | break; |
1427 | default: | |
1428 | error = -EBUSY; | |
1429 | goto out; | |
1430 | } | |
1431 | lkb->lkb_wait_count++; | |
1432 | hold_lkb(lkb); | |
1433 | ||
43279e53 | 1434 | log_debug(ls, "addwait %x cur %d overlap %d count %d f %x", |
ef0c2bb0 | 1435 | lkb->lkb_id, lkb->lkb_wait_type, mstype, |
e1af8728 | 1436 | lkb->lkb_wait_count, dlm_iflags_val(lkb)); |
e7fd4179 DT |
1437 | goto out; |
1438 | } | |
ef0c2bb0 DT |
1439 | |
1440 | DLM_ASSERT(!lkb->lkb_wait_count, | |
1441 | dlm_print_lkb(lkb); | |
1442 | printk("wait_count %d\n", lkb->lkb_wait_count);); | |
1443 | ||
1444 | lkb->lkb_wait_count++; | |
e7fd4179 | 1445 | lkb->lkb_wait_type = mstype; |
c6ff669b | 1446 | lkb->lkb_wait_nodeid = to_nodeid; /* for debugging */ |
ef0c2bb0 | 1447 | hold_lkb(lkb); |
e7fd4179 DT |
1448 | list_add(&lkb->lkb_wait_reply, &ls->ls_waiters); |
1449 | out: | |
ef0c2bb0 | 1450 | if (error) |
43279e53 | 1451 | log_error(ls, "addwait error %x %d flags %x %d %d %s", |
e1af8728 | 1452 | lkb->lkb_id, error, dlm_iflags_val(lkb), mstype, |
ef0c2bb0 | 1453 | lkb->lkb_wait_type, lkb->lkb_resource->res_name); |
90135925 | 1454 | mutex_unlock(&ls->ls_waiters_mutex); |
ef0c2bb0 | 1455 | return error; |
e7fd4179 DT |
1456 | } |
1457 | ||
b790c3b7 DT |
1458 | /* We clear the RESEND flag because we might be taking an lkb off the waiters |
1459 | list as part of process_requestqueue (e.g. a lookup that has an optimized | |
1460 | request reply on the requestqueue) between dlm_recover_waiters_pre() which | |
1461 | set RESEND and dlm_recover_waiters_post() */ | |
1462 | ||
43279e53 DT |
1463 | static int _remove_from_waiters(struct dlm_lkb *lkb, int mstype, |
1464 | struct dlm_message *ms) | |
e7fd4179 | 1465 | { |
ef0c2bb0 DT |
1466 | struct dlm_ls *ls = lkb->lkb_resource->res_ls; |
1467 | int overlap_done = 0; | |
e7fd4179 | 1468 | |
e1af8728 AA |
1469 | if (mstype == DLM_MSG_UNLOCK_REPLY && |
1470 | test_and_clear_bit(DLM_IFL_OVERLAP_UNLOCK_BIT, &lkb->lkb_iflags)) { | |
43279e53 | 1471 | log_debug(ls, "remwait %x unlock_reply overlap", lkb->lkb_id); |
ef0c2bb0 DT |
1472 | overlap_done = 1; |
1473 | goto out_del; | |
e7fd4179 | 1474 | } |
ef0c2bb0 | 1475 | |
e1af8728 AA |
1476 | if (mstype == DLM_MSG_CANCEL_REPLY && |
1477 | test_and_clear_bit(DLM_IFL_OVERLAP_CANCEL_BIT, &lkb->lkb_iflags)) { | |
43279e53 | 1478 | log_debug(ls, "remwait %x cancel_reply overlap", lkb->lkb_id); |
ef0c2bb0 DT |
1479 | overlap_done = 1; |
1480 | goto out_del; | |
1481 | } | |
1482 | ||
43279e53 DT |
1483 | /* Cancel state was preemptively cleared by a successful convert, |
1484 | see next comment, nothing to do. */ | |
1485 | ||
1486 | if ((mstype == DLM_MSG_CANCEL_REPLY) && | |
1487 | (lkb->lkb_wait_type != DLM_MSG_CANCEL)) { | |
1488 | log_debug(ls, "remwait %x cancel_reply wait_type %d", | |
1489 | lkb->lkb_id, lkb->lkb_wait_type); | |
1490 | return -1; | |
1491 | } | |
1492 | ||
1493 | /* Remove for the convert reply, and premptively remove for the | |
1494 | cancel reply. A convert has been granted while there's still | |
1495 | an outstanding cancel on it (the cancel is moot and the result | |
1496 | in the cancel reply should be 0). We preempt the cancel reply | |
1497 | because the app gets the convert result and then can follow up | |
1498 | with another op, like convert. This subsequent op would see the | |
1499 | lingering state of the cancel and fail with -EBUSY. */ | |
1500 | ||
1501 | if ((mstype == DLM_MSG_CONVERT_REPLY) && | |
e1af8728 AA |
1502 | (lkb->lkb_wait_type == DLM_MSG_CONVERT) && ms && !ms->m_result && |
1503 | test_and_clear_bit(DLM_IFL_OVERLAP_CANCEL_BIT, &lkb->lkb_iflags)) { | |
43279e53 DT |
1504 | log_debug(ls, "remwait %x convert_reply zap overlap_cancel", |
1505 | lkb->lkb_id); | |
1506 | lkb->lkb_wait_type = 0; | |
43279e53 | 1507 | lkb->lkb_wait_count--; |
1689c169 | 1508 | unhold_lkb(lkb); |
43279e53 DT |
1509 | goto out_del; |
1510 | } | |
1511 | ||
ef0c2bb0 DT |
1512 | /* N.B. type of reply may not always correspond to type of original |
1513 | msg due to lookup->request optimization, verify others? */ | |
1514 | ||
1515 | if (lkb->lkb_wait_type) { | |
1516 | lkb->lkb_wait_type = 0; | |
1517 | goto out_del; | |
1518 | } | |
1519 | ||
6d40c4a7 | 1520 | log_error(ls, "remwait error %x remote %d %x msg %d flags %x no wait", |
3428785a | 1521 | lkb->lkb_id, ms ? le32_to_cpu(ms->m_header.h_nodeid) : 0, |
e1af8728 | 1522 | lkb->lkb_remid, mstype, dlm_iflags_val(lkb)); |
ef0c2bb0 DT |
1523 | return -1; |
1524 | ||
1525 | out_del: | |
1526 | /* the force-unlock/cancel has completed and we haven't recvd a reply | |
1527 | to the op that was in progress prior to the unlock/cancel; we | |
1528 | give up on any reply to the earlier op. FIXME: not sure when/how | |
1529 | this would happen */ | |
1530 | ||
1531 | if (overlap_done && lkb->lkb_wait_type) { | |
43279e53 | 1532 | log_error(ls, "remwait error %x reply %d wait_type %d overlap", |
ef0c2bb0 DT |
1533 | lkb->lkb_id, mstype, lkb->lkb_wait_type); |
1534 | lkb->lkb_wait_count--; | |
1689c169 | 1535 | unhold_lkb(lkb); |
ef0c2bb0 DT |
1536 | lkb->lkb_wait_type = 0; |
1537 | } | |
1538 | ||
1539 | DLM_ASSERT(lkb->lkb_wait_count, dlm_print_lkb(lkb);); | |
1540 | ||
e1af8728 | 1541 | clear_bit(DLM_IFL_RESEND_BIT, &lkb->lkb_iflags); |
ef0c2bb0 DT |
1542 | lkb->lkb_wait_count--; |
1543 | if (!lkb->lkb_wait_count) | |
1544 | list_del_init(&lkb->lkb_wait_reply); | |
e7fd4179 | 1545 | unhold_lkb(lkb); |
ef0c2bb0 | 1546 | return 0; |
e7fd4179 DT |
1547 | } |
1548 | ||
ef0c2bb0 | 1549 | static int remove_from_waiters(struct dlm_lkb *lkb, int mstype) |
e7fd4179 DT |
1550 | { |
1551 | struct dlm_ls *ls = lkb->lkb_resource->res_ls; | |
1552 | int error; | |
1553 | ||
90135925 | 1554 | mutex_lock(&ls->ls_waiters_mutex); |
43279e53 | 1555 | error = _remove_from_waiters(lkb, mstype, NULL); |
90135925 | 1556 | mutex_unlock(&ls->ls_waiters_mutex); |
e7fd4179 DT |
1557 | return error; |
1558 | } | |
1559 | ||
a7e7ffac | 1560 | /* Handles situations where we might be processing a "fake" or "local" reply in |
ef0c2bb0 DT |
1561 | which we can't try to take waiters_mutex again. */ |
1562 | ||
9f48eead AA |
1563 | static int remove_from_waiters_ms(struct dlm_lkb *lkb, struct dlm_message *ms, |
1564 | bool local) | |
ef0c2bb0 DT |
1565 | { |
1566 | struct dlm_ls *ls = lkb->lkb_resource->res_ls; | |
1567 | int error; | |
1568 | ||
9f48eead | 1569 | if (!local) |
ef0c2bb0 | 1570 | mutex_lock(&ls->ls_waiters_mutex); |
00e99ccd | 1571 | error = _remove_from_waiters(lkb, le32_to_cpu(ms->m_type), ms); |
9f48eead | 1572 | if (!local) |
ef0c2bb0 DT |
1573 | mutex_unlock(&ls->ls_waiters_mutex); |
1574 | return error; | |
1575 | } | |
1576 | ||
05c32f47 DT |
1577 | static void shrink_bucket(struct dlm_ls *ls, int b) |
1578 | { | |
1579 | struct rb_node *n, *next; | |
1580 | struct dlm_rsb *r; | |
1581 | char *name; | |
1582 | int our_nodeid = dlm_our_nodeid(); | |
1583 | int remote_count = 0; | |
f1172283 | 1584 | int need_shrink = 0; |
05c32f47 | 1585 | int i, len, rv; |
c04fecb4 | 1586 | |
05c32f47 | 1587 | memset(&ls->ls_remove_lens, 0, sizeof(int) * DLM_REMOVE_NAMES_MAX); |
c04fecb4 | 1588 | |
05c32f47 | 1589 | spin_lock(&ls->ls_rsbtbl[b].lock); |
f1172283 | 1590 | |
46d6e722 | 1591 | if (!test_bit(DLM_RTF_SHRINK_BIT, &ls->ls_rsbtbl[b].flags)) { |
f1172283 DT |
1592 | spin_unlock(&ls->ls_rsbtbl[b].lock); |
1593 | return; | |
1594 | } | |
1595 | ||
05c32f47 DT |
1596 | for (n = rb_first(&ls->ls_rsbtbl[b].toss); n; n = next) { |
1597 | next = rb_next(n); | |
1598 | r = rb_entry(n, struct dlm_rsb, res_hashnode); | |
1599 | ||
1600 | /* If we're the directory record for this rsb, and | |
1601 | we're not the master of it, then we need to wait | |
1602 | for the master node to send us a dir remove for | |
1603 | before removing the dir record. */ | |
1604 | ||
1605 | if (!dlm_no_directory(ls) && | |
1606 | (r->res_master_nodeid != our_nodeid) && | |
1607 | (dlm_dir_nodeid(r) == our_nodeid)) { | |
1608 | continue; | |
e7fd4179 DT |
1609 | } |
1610 | ||
f1172283 DT |
1611 | need_shrink = 1; |
1612 | ||
05c32f47 DT |
1613 | if (!time_after_eq(jiffies, r->res_toss_time + |
1614 | dlm_config.ci_toss_secs * HZ)) { | |
1615 | continue; | |
e7fd4179 DT |
1616 | } |
1617 | ||
05c32f47 DT |
1618 | if (!dlm_no_directory(ls) && |
1619 | (r->res_master_nodeid == our_nodeid) && | |
1620 | (dlm_dir_nodeid(r) != our_nodeid)) { | |
e7fd4179 | 1621 | |
c04fecb4 DT |
1622 | /* We're the master of this rsb but we're not |
1623 | the directory record, so we need to tell the | |
1624 | dir node to remove the dir record. */ | |
1625 | ||
05c32f47 DT |
1626 | ls->ls_remove_lens[remote_count] = r->res_length; |
1627 | memcpy(ls->ls_remove_names[remote_count], r->res_name, | |
1628 | DLM_RESNAME_MAXLEN); | |
1629 | remote_count++; | |
c04fecb4 | 1630 | |
05c32f47 DT |
1631 | if (remote_count >= DLM_REMOVE_NAMES_MAX) |
1632 | break; | |
1633 | continue; | |
1634 | } | |
1635 | ||
1636 | if (!kref_put(&r->res_ref, kill_rsb)) { | |
e7fd4179 | 1637 | log_error(ls, "tossed rsb in use %s", r->res_name); |
05c32f47 | 1638 | continue; |
e7fd4179 | 1639 | } |
05c32f47 DT |
1640 | |
1641 | rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[b].toss); | |
1642 | dlm_free_rsb(r); | |
e7fd4179 | 1643 | } |
f1172283 DT |
1644 | |
1645 | if (need_shrink) | |
46d6e722 | 1646 | set_bit(DLM_RTF_SHRINK_BIT, &ls->ls_rsbtbl[b].flags); |
f1172283 | 1647 | else |
46d6e722 | 1648 | clear_bit(DLM_RTF_SHRINK_BIT, &ls->ls_rsbtbl[b].flags); |
05c32f47 | 1649 | spin_unlock(&ls->ls_rsbtbl[b].lock); |
e7fd4179 | 1650 | |
05c32f47 DT |
1651 | /* |
1652 | * While searching for rsb's to free, we found some that require | |
1653 | * remote removal. We leave them in place and find them again here | |
1654 | * so there is a very small gap between removing them from the toss | |
1655 | * list and sending the removal. Keeping this gap small is | |
1656 | * important to keep us (the master node) from being out of sync | |
1657 | * with the remote dir node for very long. | |
05c32f47 DT |
1658 | */ |
1659 | ||
1660 | for (i = 0; i < remote_count; i++) { | |
1661 | name = ls->ls_remove_names[i]; | |
1662 | len = ls->ls_remove_lens[i]; | |
1663 | ||
1664 | spin_lock(&ls->ls_rsbtbl[b].lock); | |
1665 | rv = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].toss, name, len, &r); | |
1666 | if (rv) { | |
1667 | spin_unlock(&ls->ls_rsbtbl[b].lock); | |
1668 | log_debug(ls, "remove_name not toss %s", name); | |
1669 | continue; | |
1670 | } | |
1671 | ||
1672 | if (r->res_master_nodeid != our_nodeid) { | |
1673 | spin_unlock(&ls->ls_rsbtbl[b].lock); | |
1674 | log_debug(ls, "remove_name master %d dir %d our %d %s", | |
1675 | r->res_master_nodeid, r->res_dir_nodeid, | |
1676 | our_nodeid, name); | |
1677 | continue; | |
1678 | } | |
1679 | ||
1680 | if (r->res_dir_nodeid == our_nodeid) { | |
1681 | /* should never happen */ | |
1682 | spin_unlock(&ls->ls_rsbtbl[b].lock); | |
1683 | log_error(ls, "remove_name dir %d master %d our %d %s", | |
1684 | r->res_dir_nodeid, r->res_master_nodeid, | |
1685 | our_nodeid, name); | |
1686 | continue; | |
1687 | } | |
1688 | ||
1689 | if (!time_after_eq(jiffies, r->res_toss_time + | |
1690 | dlm_config.ci_toss_secs * HZ)) { | |
1691 | spin_unlock(&ls->ls_rsbtbl[b].lock); | |
1692 | log_debug(ls, "remove_name toss_time %lu now %lu %s", | |
1693 | r->res_toss_time, jiffies, name); | |
1694 | continue; | |
1695 | } | |
1696 | ||
1697 | if (!kref_put(&r->res_ref, kill_rsb)) { | |
1698 | spin_unlock(&ls->ls_rsbtbl[b].lock); | |
1699 | log_error(ls, "remove_name in use %s", name); | |
1700 | continue; | |
1701 | } | |
1702 | ||
1703 | rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[b].toss); | |
05c32f47 | 1704 | send_remove(r); |
3872f87b | 1705 | spin_unlock(&ls->ls_rsbtbl[b].lock); |
05c32f47 DT |
1706 | |
1707 | dlm_free_rsb(r); | |
1708 | } | |
e7fd4179 DT |
1709 | } |
1710 | ||
1711 | void dlm_scan_rsbs(struct dlm_ls *ls) | |
1712 | { | |
1713 | int i; | |
1714 | ||
e7fd4179 DT |
1715 | for (i = 0; i < ls->ls_rsbtbl_size; i++) { |
1716 | shrink_bucket(ls, i); | |
85e86edf DT |
1717 | if (dlm_locking_stopped(ls)) |
1718 | break; | |
e7fd4179 DT |
1719 | cond_resched(); |
1720 | } | |
1721 | } | |
1722 | ||
1723 | /* lkb is master or local copy */ | |
1724 | ||
1725 | static void set_lvb_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1726 | { | |
1727 | int b, len = r->res_ls->ls_lvblen; | |
1728 | ||
1729 | /* b=1 lvb returned to caller | |
1730 | b=0 lvb written to rsb or invalidated | |
1731 | b=-1 do nothing */ | |
1732 | ||
1733 | b = dlm_lvb_operations[lkb->lkb_grmode + 1][lkb->lkb_rqmode + 1]; | |
1734 | ||
1735 | if (b == 1) { | |
1736 | if (!lkb->lkb_lvbptr) | |
1737 | return; | |
1738 | ||
1739 | if (!(lkb->lkb_exflags & DLM_LKF_VALBLK)) | |
1740 | return; | |
1741 | ||
1742 | if (!r->res_lvbptr) | |
1743 | return; | |
1744 | ||
1745 | memcpy(lkb->lkb_lvbptr, r->res_lvbptr, len); | |
1746 | lkb->lkb_lvbseq = r->res_lvbseq; | |
1747 | ||
1748 | } else if (b == 0) { | |
1749 | if (lkb->lkb_exflags & DLM_LKF_IVVALBLK) { | |
1750 | rsb_set_flag(r, RSB_VALNOTVALID); | |
1751 | return; | |
1752 | } | |
1753 | ||
1754 | if (!lkb->lkb_lvbptr) | |
1755 | return; | |
1756 | ||
1757 | if (!(lkb->lkb_exflags & DLM_LKF_VALBLK)) | |
1758 | return; | |
1759 | ||
1760 | if (!r->res_lvbptr) | |
52bda2b5 | 1761 | r->res_lvbptr = dlm_allocate_lvb(r->res_ls); |
e7fd4179 DT |
1762 | |
1763 | if (!r->res_lvbptr) | |
1764 | return; | |
1765 | ||
1766 | memcpy(r->res_lvbptr, lkb->lkb_lvbptr, len); | |
1767 | r->res_lvbseq++; | |
1768 | lkb->lkb_lvbseq = r->res_lvbseq; | |
1769 | rsb_clear_flag(r, RSB_VALNOTVALID); | |
1770 | } | |
1771 | ||
1772 | if (rsb_flag(r, RSB_VALNOTVALID)) | |
1361737f | 1773 | set_bit(DLM_SBF_VALNOTVALID_BIT, &lkb->lkb_sbflags); |
e7fd4179 DT |
1774 | } |
1775 | ||
1776 | static void set_lvb_unlock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1777 | { | |
1778 | if (lkb->lkb_grmode < DLM_LOCK_PW) | |
1779 | return; | |
1780 | ||
1781 | if (lkb->lkb_exflags & DLM_LKF_IVVALBLK) { | |
1782 | rsb_set_flag(r, RSB_VALNOTVALID); | |
1783 | return; | |
1784 | } | |
1785 | ||
1786 | if (!lkb->lkb_lvbptr) | |
1787 | return; | |
1788 | ||
1789 | if (!(lkb->lkb_exflags & DLM_LKF_VALBLK)) | |
1790 | return; | |
1791 | ||
1792 | if (!r->res_lvbptr) | |
52bda2b5 | 1793 | r->res_lvbptr = dlm_allocate_lvb(r->res_ls); |
e7fd4179 DT |
1794 | |
1795 | if (!r->res_lvbptr) | |
1796 | return; | |
1797 | ||
1798 | memcpy(r->res_lvbptr, lkb->lkb_lvbptr, r->res_ls->ls_lvblen); | |
1799 | r->res_lvbseq++; | |
1800 | rsb_clear_flag(r, RSB_VALNOTVALID); | |
1801 | } | |
1802 | ||
1803 | /* lkb is process copy (pc) */ | |
1804 | ||
1805 | static void set_lvb_lock_pc(struct dlm_rsb *r, struct dlm_lkb *lkb, | |
1806 | struct dlm_message *ms) | |
1807 | { | |
1808 | int b; | |
1809 | ||
1810 | if (!lkb->lkb_lvbptr) | |
1811 | return; | |
1812 | ||
1813 | if (!(lkb->lkb_exflags & DLM_LKF_VALBLK)) | |
1814 | return; | |
1815 | ||
597d0cae | 1816 | b = dlm_lvb_operations[lkb->lkb_grmode + 1][lkb->lkb_rqmode + 1]; |
e7fd4179 DT |
1817 | if (b == 1) { |
1818 | int len = receive_extralen(ms); | |
cfa805f6 BVA |
1819 | if (len > r->res_ls->ls_lvblen) |
1820 | len = r->res_ls->ls_lvblen; | |
e7fd4179 | 1821 | memcpy(lkb->lkb_lvbptr, ms->m_extra, len); |
00e99ccd | 1822 | lkb->lkb_lvbseq = le32_to_cpu(ms->m_lvbseq); |
e7fd4179 DT |
1823 | } |
1824 | } | |
1825 | ||
1826 | /* Manipulate lkb's on rsb's convert/granted/waiting queues | |
1827 | remove_lock -- used for unlock, removes lkb from granted | |
1828 | revert_lock -- used for cancel, moves lkb from convert to granted | |
1829 | grant_lock -- used for request and convert, adds lkb to granted or | |
1830 | moves lkb from convert or waiting to granted | |
1831 | ||
1832 | Each of these is used for master or local copy lkb's. There is | |
1833 | also a _pc() variation used to make the corresponding change on | |
1834 | a process copy (pc) lkb. */ | |
1835 | ||
1836 | static void _remove_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1837 | { | |
1838 | del_lkb(r, lkb); | |
1839 | lkb->lkb_grmode = DLM_LOCK_IV; | |
1840 | /* this unhold undoes the original ref from create_lkb() | |
1841 | so this leads to the lkb being freed */ | |
1842 | unhold_lkb(lkb); | |
1843 | } | |
1844 | ||
1845 | static void remove_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1846 | { | |
1847 | set_lvb_unlock(r, lkb); | |
1848 | _remove_lock(r, lkb); | |
1849 | } | |
1850 | ||
1851 | static void remove_lock_pc(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1852 | { | |
1853 | _remove_lock(r, lkb); | |
1854 | } | |
1855 | ||
ef0c2bb0 DT |
1856 | /* returns: 0 did nothing |
1857 | 1 moved lock to granted | |
1858 | -1 removed lock */ | |
1859 | ||
1860 | static int revert_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
e7fd4179 | 1861 | { |
ef0c2bb0 DT |
1862 | int rv = 0; |
1863 | ||
e7fd4179 DT |
1864 | lkb->lkb_rqmode = DLM_LOCK_IV; |
1865 | ||
1866 | switch (lkb->lkb_status) { | |
597d0cae DT |
1867 | case DLM_LKSTS_GRANTED: |
1868 | break; | |
e7fd4179 DT |
1869 | case DLM_LKSTS_CONVERT: |
1870 | move_lkb(r, lkb, DLM_LKSTS_GRANTED); | |
ef0c2bb0 | 1871 | rv = 1; |
e7fd4179 DT |
1872 | break; |
1873 | case DLM_LKSTS_WAITING: | |
1874 | del_lkb(r, lkb); | |
1875 | lkb->lkb_grmode = DLM_LOCK_IV; | |
1876 | /* this unhold undoes the original ref from create_lkb() | |
1877 | so this leads to the lkb being freed */ | |
1878 | unhold_lkb(lkb); | |
ef0c2bb0 | 1879 | rv = -1; |
e7fd4179 DT |
1880 | break; |
1881 | default: | |
1882 | log_print("invalid status for revert %d", lkb->lkb_status); | |
1883 | } | |
ef0c2bb0 | 1884 | return rv; |
e7fd4179 DT |
1885 | } |
1886 | ||
ef0c2bb0 | 1887 | static int revert_lock_pc(struct dlm_rsb *r, struct dlm_lkb *lkb) |
e7fd4179 | 1888 | { |
ef0c2bb0 | 1889 | return revert_lock(r, lkb); |
e7fd4179 DT |
1890 | } |
1891 | ||
1892 | static void _grant_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1893 | { | |
1894 | if (lkb->lkb_grmode != lkb->lkb_rqmode) { | |
1895 | lkb->lkb_grmode = lkb->lkb_rqmode; | |
1896 | if (lkb->lkb_status) | |
1897 | move_lkb(r, lkb, DLM_LKSTS_GRANTED); | |
1898 | else | |
1899 | add_lkb(r, lkb, DLM_LKSTS_GRANTED); | |
1900 | } | |
1901 | ||
1902 | lkb->lkb_rqmode = DLM_LOCK_IV; | |
4875647a | 1903 | lkb->lkb_highbast = 0; |
e7fd4179 DT |
1904 | } |
1905 | ||
1906 | static void grant_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1907 | { | |
1908 | set_lvb_lock(r, lkb); | |
1909 | _grant_lock(r, lkb); | |
e7fd4179 DT |
1910 | } |
1911 | ||
1912 | static void grant_lock_pc(struct dlm_rsb *r, struct dlm_lkb *lkb, | |
1913 | struct dlm_message *ms) | |
1914 | { | |
1915 | set_lvb_lock_pc(r, lkb, ms); | |
1916 | _grant_lock(r, lkb); | |
1917 | } | |
1918 | ||
1919 | /* called by grant_pending_locks() which means an async grant message must | |
1920 | be sent to the requesting node in addition to granting the lock if the | |
1921 | lkb belongs to a remote node. */ | |
1922 | ||
1923 | static void grant_lock_pending(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
1924 | { | |
1925 | grant_lock(r, lkb); | |
1926 | if (is_master_copy(lkb)) | |
1927 | send_grant(r, lkb); | |
1928 | else | |
1929 | queue_cast(r, lkb, 0); | |
1930 | } | |
1931 | ||
7d3c1feb DT |
1932 | /* The special CONVDEADLK, ALTPR and ALTCW flags allow the master to |
1933 | change the granted/requested modes. We're munging things accordingly in | |
1934 | the process copy. | |
1935 | CONVDEADLK: our grmode may have been forced down to NL to resolve a | |
1936 | conversion deadlock | |
1937 | ALTPR/ALTCW: our rqmode may have been changed to PR or CW to become | |
1938 | compatible with other granted locks */ | |
1939 | ||
2a7ce0ed | 1940 | static void munge_demoted(struct dlm_lkb *lkb) |
7d3c1feb | 1941 | { |
7d3c1feb DT |
1942 | if (lkb->lkb_rqmode == DLM_LOCK_IV || lkb->lkb_grmode == DLM_LOCK_IV) { |
1943 | log_print("munge_demoted %x invalid modes gr %d rq %d", | |
1944 | lkb->lkb_id, lkb->lkb_grmode, lkb->lkb_rqmode); | |
1945 | return; | |
1946 | } | |
1947 | ||
1948 | lkb->lkb_grmode = DLM_LOCK_NL; | |
1949 | } | |
1950 | ||
1951 | static void munge_altmode(struct dlm_lkb *lkb, struct dlm_message *ms) | |
1952 | { | |
00e99ccd AA |
1953 | if (ms->m_type != cpu_to_le32(DLM_MSG_REQUEST_REPLY) && |
1954 | ms->m_type != cpu_to_le32(DLM_MSG_GRANT)) { | |
7d3c1feb | 1955 | log_print("munge_altmode %x invalid reply type %d", |
00e99ccd | 1956 | lkb->lkb_id, le32_to_cpu(ms->m_type)); |
7d3c1feb DT |
1957 | return; |
1958 | } | |
1959 | ||
1960 | if (lkb->lkb_exflags & DLM_LKF_ALTPR) | |
1961 | lkb->lkb_rqmode = DLM_LOCK_PR; | |
1962 | else if (lkb->lkb_exflags & DLM_LKF_ALTCW) | |
1963 | lkb->lkb_rqmode = DLM_LOCK_CW; | |
1964 | else { | |
1965 | log_print("munge_altmode invalid exflags %x", lkb->lkb_exflags); | |
1966 | dlm_print_lkb(lkb); | |
1967 | } | |
1968 | } | |
1969 | ||
e7fd4179 DT |
1970 | static inline int first_in_list(struct dlm_lkb *lkb, struct list_head *head) |
1971 | { | |
1972 | struct dlm_lkb *first = list_entry(head->next, struct dlm_lkb, | |
1973 | lkb_statequeue); | |
1974 | if (lkb->lkb_id == first->lkb_id) | |
90135925 | 1975 | return 1; |
e7fd4179 | 1976 | |
90135925 | 1977 | return 0; |
e7fd4179 DT |
1978 | } |
1979 | ||
e7fd4179 DT |
1980 | /* Check if the given lkb conflicts with another lkb on the queue. */ |
1981 | ||
1982 | static int queue_conflict(struct list_head *head, struct dlm_lkb *lkb) | |
1983 | { | |
1984 | struct dlm_lkb *this; | |
1985 | ||
1986 | list_for_each_entry(this, head, lkb_statequeue) { | |
1987 | if (this == lkb) | |
1988 | continue; | |
3bcd3687 | 1989 | if (!modes_compat(this, lkb)) |
90135925 | 1990 | return 1; |
e7fd4179 | 1991 | } |
90135925 | 1992 | return 0; |
e7fd4179 DT |
1993 | } |
1994 | ||
1995 | /* | |
1996 | * "A conversion deadlock arises with a pair of lock requests in the converting | |
1997 | * queue for one resource. The granted mode of each lock blocks the requested | |
1998 | * mode of the other lock." | |
1999 | * | |
c85d65e9 DT |
2000 | * Part 2: if the granted mode of lkb is preventing an earlier lkb in the |
2001 | * convert queue from being granted, then deadlk/demote lkb. | |
e7fd4179 DT |
2002 | * |
2003 | * Example: | |
2004 | * Granted Queue: empty | |
2005 | * Convert Queue: NL->EX (first lock) | |
2006 | * PR->EX (second lock) | |
2007 | * | |
2008 | * The first lock can't be granted because of the granted mode of the second | |
2009 | * lock and the second lock can't be granted because it's not first in the | |
c85d65e9 DT |
2010 | * list. We either cancel lkb's conversion (PR->EX) and return EDEADLK, or we |
2011 | * demote the granted mode of lkb (from PR to NL) if it has the CONVDEADLK | |
2012 | * flag set and return DEMOTED in the lksb flags. | |
e7fd4179 | 2013 | * |
c85d65e9 DT |
2014 | * Originally, this function detected conv-deadlk in a more limited scope: |
2015 | * - if !modes_compat(lkb1, lkb2) && !modes_compat(lkb2, lkb1), or | |
2016 | * - if lkb1 was the first entry in the queue (not just earlier), and was | |
2017 | * blocked by the granted mode of lkb2, and there was nothing on the | |
2018 | * granted queue preventing lkb1 from being granted immediately, i.e. | |
2019 | * lkb2 was the only thing preventing lkb1 from being granted. | |
2020 | * | |
2021 | * That second condition meant we'd only say there was conv-deadlk if | |
2022 | * resolving it (by demotion) would lead to the first lock on the convert | |
2023 | * queue being granted right away. It allowed conversion deadlocks to exist | |
2024 | * between locks on the convert queue while they couldn't be granted anyway. | |
2025 | * | |
2026 | * Now, we detect and take action on conversion deadlocks immediately when | |
2027 | * they're created, even if they may not be immediately consequential. If | |
2028 | * lkb1 exists anywhere in the convert queue and lkb2 comes in with a granted | |
2029 | * mode that would prevent lkb1's conversion from being granted, we do a | |
2030 | * deadlk/demote on lkb2 right away and don't let it onto the convert queue. | |
2031 | * I think this means that the lkb_is_ahead condition below should always | |
2032 | * be zero, i.e. there will never be conv-deadlk between two locks that are | |
2033 | * both already on the convert queue. | |
e7fd4179 DT |
2034 | */ |
2035 | ||
c85d65e9 | 2036 | static int conversion_deadlock_detect(struct dlm_rsb *r, struct dlm_lkb *lkb2) |
e7fd4179 | 2037 | { |
c85d65e9 DT |
2038 | struct dlm_lkb *lkb1; |
2039 | int lkb_is_ahead = 0; | |
e7fd4179 | 2040 | |
c85d65e9 DT |
2041 | list_for_each_entry(lkb1, &r->res_convertqueue, lkb_statequeue) { |
2042 | if (lkb1 == lkb2) { | |
2043 | lkb_is_ahead = 1; | |
e7fd4179 DT |
2044 | continue; |
2045 | } | |
2046 | ||
c85d65e9 DT |
2047 | if (!lkb_is_ahead) { |
2048 | if (!modes_compat(lkb2, lkb1)) | |
2049 | return 1; | |
2050 | } else { | |
2051 | if (!modes_compat(lkb2, lkb1) && | |
2052 | !modes_compat(lkb1, lkb2)) | |
2053 | return 1; | |
2054 | } | |
e7fd4179 | 2055 | } |
90135925 | 2056 | return 0; |
e7fd4179 DT |
2057 | } |
2058 | ||
2059 | /* | |
2060 | * Return 1 if the lock can be granted, 0 otherwise. | |
2061 | * Also detect and resolve conversion deadlocks. | |
2062 | * | |
2063 | * lkb is the lock to be granted | |
2064 | * | |
2065 | * now is 1 if the function is being called in the context of the | |
2066 | * immediate request, it is 0 if called later, after the lock has been | |
2067 | * queued. | |
2068 | * | |
c503a621 DT |
2069 | * recover is 1 if dlm_recover_grant() is trying to grant conversions |
2070 | * after recovery. | |
2071 | * | |
e7fd4179 DT |
2072 | * References are from chapter 6 of "VAXcluster Principles" by Roy Davis |
2073 | */ | |
2074 | ||
c503a621 DT |
2075 | static int _can_be_granted(struct dlm_rsb *r, struct dlm_lkb *lkb, int now, |
2076 | int recover) | |
e7fd4179 DT |
2077 | { |
2078 | int8_t conv = (lkb->lkb_grmode != DLM_LOCK_IV); | |
2079 | ||
2080 | /* | |
2081 | * 6-10: Version 5.4 introduced an option to address the phenomenon of | |
2082 | * a new request for a NL mode lock being blocked. | |
2083 | * | |
2084 | * 6-11: If the optional EXPEDITE flag is used with the new NL mode | |
2085 | * request, then it would be granted. In essence, the use of this flag | |
2086 | * tells the Lock Manager to expedite theis request by not considering | |
2087 | * what may be in the CONVERTING or WAITING queues... As of this | |
2088 | * writing, the EXPEDITE flag can be used only with new requests for NL | |
2089 | * mode locks. This flag is not valid for conversion requests. | |
2090 | * | |
2091 | * A shortcut. Earlier checks return an error if EXPEDITE is used in a | |
2092 | * conversion or used with a non-NL requested mode. We also know an | |
2093 | * EXPEDITE request is always granted immediately, so now must always | |
2094 | * be 1. The full condition to grant an expedite request: (now && | |
2095 | * !conv && lkb->rqmode == DLM_LOCK_NL && (flags & EXPEDITE)) can | |
2096 | * therefore be shortened to just checking the flag. | |
2097 | */ | |
2098 | ||
2099 | if (lkb->lkb_exflags & DLM_LKF_EXPEDITE) | |
90135925 | 2100 | return 1; |
e7fd4179 DT |
2101 | |
2102 | /* | |
2103 | * A shortcut. Without this, !queue_conflict(grantqueue, lkb) would be | |
2104 | * added to the remaining conditions. | |
2105 | */ | |
2106 | ||
2107 | if (queue_conflict(&r->res_grantqueue, lkb)) | |
c503a621 | 2108 | return 0; |
e7fd4179 DT |
2109 | |
2110 | /* | |
2111 | * 6-3: By default, a conversion request is immediately granted if the | |
2112 | * requested mode is compatible with the modes of all other granted | |
2113 | * locks | |
2114 | */ | |
2115 | ||
2116 | if (queue_conflict(&r->res_convertqueue, lkb)) | |
c503a621 DT |
2117 | return 0; |
2118 | ||
2119 | /* | |
2120 | * The RECOVER_GRANT flag means dlm_recover_grant() is granting | |
2121 | * locks for a recovered rsb, on which lkb's have been rebuilt. | |
2122 | * The lkb's may have been rebuilt on the queues in a different | |
2123 | * order than they were in on the previous master. So, granting | |
2124 | * queued conversions in order after recovery doesn't make sense | |
2125 | * since the order hasn't been preserved anyway. The new order | |
2126 | * could also have created a new "in place" conversion deadlock. | |
2127 | * (e.g. old, failed master held granted EX, with PR->EX, NL->EX. | |
2128 | * After recovery, there would be no granted locks, and possibly | |
2129 | * NL->EX, PR->EX, an in-place conversion deadlock.) So, after | |
2130 | * recovery, grant conversions without considering order. | |
2131 | */ | |
2132 | ||
2133 | if (conv && recover) | |
2134 | return 1; | |
e7fd4179 DT |
2135 | |
2136 | /* | |
2137 | * 6-5: But the default algorithm for deciding whether to grant or | |
2138 | * queue conversion requests does not by itself guarantee that such | |
2139 | * requests are serviced on a "first come first serve" basis. This, in | |
2140 | * turn, can lead to a phenomenon known as "indefinate postponement". | |
2141 | * | |
2142 | * 6-7: This issue is dealt with by using the optional QUECVT flag with | |
2143 | * the system service employed to request a lock conversion. This flag | |
2144 | * forces certain conversion requests to be queued, even if they are | |
2145 | * compatible with the granted modes of other locks on the same | |
2146 | * resource. Thus, the use of this flag results in conversion requests | |
2147 | * being ordered on a "first come first servce" basis. | |
2148 | * | |
2149 | * DCT: This condition is all about new conversions being able to occur | |
2150 | * "in place" while the lock remains on the granted queue (assuming | |
2151 | * nothing else conflicts.) IOW if QUECVT isn't set, a conversion | |
2152 | * doesn't _have_ to go onto the convert queue where it's processed in | |
2153 | * order. The "now" variable is necessary to distinguish converts | |
2154 | * being received and processed for the first time now, because once a | |
2155 | * convert is moved to the conversion queue the condition below applies | |
2156 | * requiring fifo granting. | |
2157 | */ | |
2158 | ||
2159 | if (now && conv && !(lkb->lkb_exflags & DLM_LKF_QUECVT)) | |
90135925 | 2160 | return 1; |
e7fd4179 | 2161 | |
53ad1c98 DT |
2162 | /* |
2163 | * Even if the convert is compat with all granted locks, | |
2164 | * QUECVT forces it behind other locks on the convert queue. | |
2165 | */ | |
2166 | ||
2167 | if (now && conv && (lkb->lkb_exflags & DLM_LKF_QUECVT)) { | |
2168 | if (list_empty(&r->res_convertqueue)) | |
2169 | return 1; | |
2170 | else | |
c503a621 | 2171 | return 0; |
53ad1c98 DT |
2172 | } |
2173 | ||
e7fd4179 | 2174 | /* |
3bcd3687 DT |
2175 | * The NOORDER flag is set to avoid the standard vms rules on grant |
2176 | * order. | |
e7fd4179 DT |
2177 | */ |
2178 | ||
2179 | if (lkb->lkb_exflags & DLM_LKF_NOORDER) | |
90135925 | 2180 | return 1; |
e7fd4179 DT |
2181 | |
2182 | /* | |
2183 | * 6-3: Once in that queue [CONVERTING], a conversion request cannot be | |
2184 | * granted until all other conversion requests ahead of it are granted | |
2185 | * and/or canceled. | |
2186 | */ | |
2187 | ||
2188 | if (!now && conv && first_in_list(lkb, &r->res_convertqueue)) | |
90135925 | 2189 | return 1; |
e7fd4179 DT |
2190 | |
2191 | /* | |
2192 | * 6-4: By default, a new request is immediately granted only if all | |
2193 | * three of the following conditions are satisfied when the request is | |
2194 | * issued: | |
2195 | * - The queue of ungranted conversion requests for the resource is | |
2196 | * empty. | |
2197 | * - The queue of ungranted new requests for the resource is empty. | |
2198 | * - The mode of the new request is compatible with the most | |
2199 | * restrictive mode of all granted locks on the resource. | |
2200 | */ | |
2201 | ||
2202 | if (now && !conv && list_empty(&r->res_convertqueue) && | |
2203 | list_empty(&r->res_waitqueue)) | |
90135925 | 2204 | return 1; |
e7fd4179 DT |
2205 | |
2206 | /* | |
2207 | * 6-4: Once a lock request is in the queue of ungranted new requests, | |
2208 | * it cannot be granted until the queue of ungranted conversion | |
2209 | * requests is empty, all ungranted new requests ahead of it are | |
2210 | * granted and/or canceled, and it is compatible with the granted mode | |
2211 | * of the most restrictive lock granted on the resource. | |
2212 | */ | |
2213 | ||
2214 | if (!now && !conv && list_empty(&r->res_convertqueue) && | |
2215 | first_in_list(lkb, &r->res_waitqueue)) | |
90135925 | 2216 | return 1; |
c503a621 | 2217 | |
90135925 | 2218 | return 0; |
e7fd4179 DT |
2219 | } |
2220 | ||
c85d65e9 | 2221 | static int can_be_granted(struct dlm_rsb *r, struct dlm_lkb *lkb, int now, |
c503a621 | 2222 | int recover, int *err) |
e7fd4179 | 2223 | { |
e7fd4179 DT |
2224 | int rv; |
2225 | int8_t alt = 0, rqmode = lkb->lkb_rqmode; | |
c85d65e9 DT |
2226 | int8_t is_convert = (lkb->lkb_grmode != DLM_LOCK_IV); |
2227 | ||
2228 | if (err) | |
2229 | *err = 0; | |
e7fd4179 | 2230 | |
c503a621 | 2231 | rv = _can_be_granted(r, lkb, now, recover); |
e7fd4179 DT |
2232 | if (rv) |
2233 | goto out; | |
2234 | ||
c85d65e9 DT |
2235 | /* |
2236 | * The CONVDEADLK flag is non-standard and tells the dlm to resolve | |
2237 | * conversion deadlocks by demoting grmode to NL, otherwise the dlm | |
2238 | * cancels one of the locks. | |
2239 | */ | |
2240 | ||
2241 | if (is_convert && can_be_queued(lkb) && | |
2242 | conversion_deadlock_detect(r, lkb)) { | |
2243 | if (lkb->lkb_exflags & DLM_LKF_CONVDEADLK) { | |
2244 | lkb->lkb_grmode = DLM_LOCK_NL; | |
1361737f | 2245 | set_bit(DLM_SBF_DEMOTED_BIT, &lkb->lkb_sbflags); |
294e7e45 | 2246 | } else if (err) { |
2247 | *err = -EDEADLK; | |
2248 | } else { | |
2249 | log_print("can_be_granted deadlock %x now %d", | |
2250 | lkb->lkb_id, now); | |
2251 | dlm_dump_rsb(r); | |
c85d65e9 | 2252 | } |
e7fd4179 | 2253 | goto out; |
c85d65e9 | 2254 | } |
e7fd4179 | 2255 | |
c85d65e9 DT |
2256 | /* |
2257 | * The ALTPR and ALTCW flags are non-standard and tell the dlm to try | |
2258 | * to grant a request in a mode other than the normal rqmode. It's a | |
2259 | * simple way to provide a big optimization to applications that can | |
2260 | * use them. | |
2261 | */ | |
2262 | ||
2263 | if (rqmode != DLM_LOCK_PR && (lkb->lkb_exflags & DLM_LKF_ALTPR)) | |
e7fd4179 | 2264 | alt = DLM_LOCK_PR; |
c85d65e9 | 2265 | else if (rqmode != DLM_LOCK_CW && (lkb->lkb_exflags & DLM_LKF_ALTCW)) |
e7fd4179 DT |
2266 | alt = DLM_LOCK_CW; |
2267 | ||
2268 | if (alt) { | |
2269 | lkb->lkb_rqmode = alt; | |
c503a621 | 2270 | rv = _can_be_granted(r, lkb, now, 0); |
e7fd4179 | 2271 | if (rv) |
1361737f | 2272 | set_bit(DLM_SBF_ALTMODE_BIT, &lkb->lkb_sbflags); |
e7fd4179 DT |
2273 | else |
2274 | lkb->lkb_rqmode = rqmode; | |
2275 | } | |
2276 | out: | |
2277 | return rv; | |
2278 | } | |
2279 | ||
36509258 DT |
2280 | /* Returns the highest requested mode of all blocked conversions; sets |
2281 | cw if there's a blocked conversion to DLM_LOCK_CW. */ | |
c85d65e9 | 2282 | |
4875647a DT |
2283 | static int grant_pending_convert(struct dlm_rsb *r, int high, int *cw, |
2284 | unsigned int *count) | |
e7fd4179 DT |
2285 | { |
2286 | struct dlm_lkb *lkb, *s; | |
c503a621 | 2287 | int recover = rsb_flag(r, RSB_RECOVER_GRANT); |
e7fd4179 | 2288 | int hi, demoted, quit, grant_restart, demote_restart; |
c85d65e9 | 2289 | int deadlk; |
e7fd4179 DT |
2290 | |
2291 | quit = 0; | |
2292 | restart: | |
2293 | grant_restart = 0; | |
2294 | demote_restart = 0; | |
2295 | hi = DLM_LOCK_IV; | |
2296 | ||
2297 | list_for_each_entry_safe(lkb, s, &r->res_convertqueue, lkb_statequeue) { | |
2298 | demoted = is_demoted(lkb); | |
c85d65e9 DT |
2299 | deadlk = 0; |
2300 | ||
c503a621 | 2301 | if (can_be_granted(r, lkb, 0, recover, &deadlk)) { |
e7fd4179 DT |
2302 | grant_lock_pending(r, lkb); |
2303 | grant_restart = 1; | |
4875647a DT |
2304 | if (count) |
2305 | (*count)++; | |
c85d65e9 | 2306 | continue; |
e7fd4179 | 2307 | } |
c85d65e9 DT |
2308 | |
2309 | if (!demoted && is_demoted(lkb)) { | |
2310 | log_print("WARN: pending demoted %x node %d %s", | |
2311 | lkb->lkb_id, lkb->lkb_nodeid, r->res_name); | |
2312 | demote_restart = 1; | |
2313 | continue; | |
2314 | } | |
2315 | ||
2316 | if (deadlk) { | |
294e7e45 | 2317 | /* |
2318 | * If DLM_LKB_NODLKWT flag is set and conversion | |
2319 | * deadlock is detected, we request blocking AST and | |
2320 | * down (or cancel) conversion. | |
2321 | */ | |
2322 | if (lkb->lkb_exflags & DLM_LKF_NODLCKWT) { | |
2323 | if (lkb->lkb_highbast < lkb->lkb_rqmode) { | |
2324 | queue_bast(r, lkb, lkb->lkb_rqmode); | |
2325 | lkb->lkb_highbast = lkb->lkb_rqmode; | |
2326 | } | |
2327 | } else { | |
2328 | log_print("WARN: pending deadlock %x node %d %s", | |
2329 | lkb->lkb_id, lkb->lkb_nodeid, | |
2330 | r->res_name); | |
2331 | dlm_dump_rsb(r); | |
2332 | } | |
c85d65e9 DT |
2333 | continue; |
2334 | } | |
2335 | ||
2336 | hi = max_t(int, lkb->lkb_rqmode, hi); | |
36509258 DT |
2337 | |
2338 | if (cw && lkb->lkb_rqmode == DLM_LOCK_CW) | |
2339 | *cw = 1; | |
e7fd4179 DT |
2340 | } |
2341 | ||
2342 | if (grant_restart) | |
2343 | goto restart; | |
2344 | if (demote_restart && !quit) { | |
2345 | quit = 1; | |
2346 | goto restart; | |
2347 | } | |
2348 | ||
2349 | return max_t(int, high, hi); | |
2350 | } | |
2351 | ||
4875647a DT |
2352 | static int grant_pending_wait(struct dlm_rsb *r, int high, int *cw, |
2353 | unsigned int *count) | |
e7fd4179 DT |
2354 | { |
2355 | struct dlm_lkb *lkb, *s; | |
2356 | ||
2357 | list_for_each_entry_safe(lkb, s, &r->res_waitqueue, lkb_statequeue) { | |
c503a621 | 2358 | if (can_be_granted(r, lkb, 0, 0, NULL)) { |
e7fd4179 | 2359 | grant_lock_pending(r, lkb); |
4875647a DT |
2360 | if (count) |
2361 | (*count)++; | |
2362 | } else { | |
e7fd4179 | 2363 | high = max_t(int, lkb->lkb_rqmode, high); |
36509258 DT |
2364 | if (lkb->lkb_rqmode == DLM_LOCK_CW) |
2365 | *cw = 1; | |
2366 | } | |
e7fd4179 DT |
2367 | } |
2368 | ||
2369 | return high; | |
2370 | } | |
2371 | ||
36509258 DT |
2372 | /* cw of 1 means there's a lock with a rqmode of DLM_LOCK_CW that's blocked |
2373 | on either the convert or waiting queue. | |
2374 | high is the largest rqmode of all locks blocked on the convert or | |
2375 | waiting queue. */ | |
2376 | ||
2377 | static int lock_requires_bast(struct dlm_lkb *gr, int high, int cw) | |
2378 | { | |
2379 | if (gr->lkb_grmode == DLM_LOCK_PR && cw) { | |
2380 | if (gr->lkb_highbast < DLM_LOCK_EX) | |
2381 | return 1; | |
2382 | return 0; | |
2383 | } | |
2384 | ||
2385 | if (gr->lkb_highbast < high && | |
2386 | !__dlm_compat_matrix[gr->lkb_grmode+1][high+1]) | |
2387 | return 1; | |
2388 | return 0; | |
2389 | } | |
2390 | ||
4875647a | 2391 | static void grant_pending_locks(struct dlm_rsb *r, unsigned int *count) |
e7fd4179 DT |
2392 | { |
2393 | struct dlm_lkb *lkb, *s; | |
2394 | int high = DLM_LOCK_IV; | |
36509258 | 2395 | int cw = 0; |
e7fd4179 | 2396 | |
4875647a DT |
2397 | if (!is_master(r)) { |
2398 | log_print("grant_pending_locks r nodeid %d", r->res_nodeid); | |
2399 | dlm_dump_rsb(r); | |
2400 | return; | |
2401 | } | |
e7fd4179 | 2402 | |
4875647a DT |
2403 | high = grant_pending_convert(r, high, &cw, count); |
2404 | high = grant_pending_wait(r, high, &cw, count); | |
e7fd4179 DT |
2405 | |
2406 | if (high == DLM_LOCK_IV) | |
2407 | return; | |
2408 | ||
2409 | /* | |
2410 | * If there are locks left on the wait/convert queue then send blocking | |
2411 | * ASTs to granted locks based on the largest requested mode (high) | |
36509258 | 2412 | * found above. |
e7fd4179 DT |
2413 | */ |
2414 | ||
2415 | list_for_each_entry_safe(lkb, s, &r->res_grantqueue, lkb_statequeue) { | |
e5dae548 | 2416 | if (lkb->lkb_bastfn && lock_requires_bast(lkb, high, cw)) { |
329fc4c3 DT |
2417 | if (cw && high == DLM_LOCK_PR && |
2418 | lkb->lkb_grmode == DLM_LOCK_PR) | |
36509258 DT |
2419 | queue_bast(r, lkb, DLM_LOCK_CW); |
2420 | else | |
2421 | queue_bast(r, lkb, high); | |
e7fd4179 DT |
2422 | lkb->lkb_highbast = high; |
2423 | } | |
2424 | } | |
2425 | } | |
2426 | ||
36509258 DT |
2427 | static int modes_require_bast(struct dlm_lkb *gr, struct dlm_lkb *rq) |
2428 | { | |
2429 | if ((gr->lkb_grmode == DLM_LOCK_PR && rq->lkb_rqmode == DLM_LOCK_CW) || | |
2430 | (gr->lkb_grmode == DLM_LOCK_CW && rq->lkb_rqmode == DLM_LOCK_PR)) { | |
2431 | if (gr->lkb_highbast < DLM_LOCK_EX) | |
2432 | return 1; | |
2433 | return 0; | |
2434 | } | |
2435 | ||
2436 | if (gr->lkb_highbast < rq->lkb_rqmode && !modes_compat(gr, rq)) | |
2437 | return 1; | |
2438 | return 0; | |
2439 | } | |
2440 | ||
e7fd4179 DT |
2441 | static void send_bast_queue(struct dlm_rsb *r, struct list_head *head, |
2442 | struct dlm_lkb *lkb) | |
2443 | { | |
2444 | struct dlm_lkb *gr; | |
2445 | ||
2446 | list_for_each_entry(gr, head, lkb_statequeue) { | |
314dd2a0 SW |
2447 | /* skip self when sending basts to convertqueue */ |
2448 | if (gr == lkb) | |
2449 | continue; | |
e5dae548 | 2450 | if (gr->lkb_bastfn && modes_require_bast(gr, lkb)) { |
e7fd4179 DT |
2451 | queue_bast(r, gr, lkb->lkb_rqmode); |
2452 | gr->lkb_highbast = lkb->lkb_rqmode; | |
2453 | } | |
2454 | } | |
2455 | } | |
2456 | ||
2457 | static void send_blocking_asts(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2458 | { | |
2459 | send_bast_queue(r, &r->res_grantqueue, lkb); | |
2460 | } | |
2461 | ||
2462 | static void send_blocking_asts_all(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2463 | { | |
2464 | send_bast_queue(r, &r->res_grantqueue, lkb); | |
2465 | send_bast_queue(r, &r->res_convertqueue, lkb); | |
2466 | } | |
2467 | ||
2468 | /* set_master(r, lkb) -- set the master nodeid of a resource | |
2469 | ||
2470 | The purpose of this function is to set the nodeid field in the given | |
2471 | lkb using the nodeid field in the given rsb. If the rsb's nodeid is | |
2472 | known, it can just be copied to the lkb and the function will return | |
2473 | 0. If the rsb's nodeid is _not_ known, it needs to be looked up | |
2474 | before it can be copied to the lkb. | |
2475 | ||
2476 | When the rsb nodeid is being looked up remotely, the initial lkb | |
2477 | causing the lookup is kept on the ls_waiters list waiting for the | |
2478 | lookup reply. Other lkb's waiting for the same rsb lookup are kept | |
2479 | on the rsb's res_lookup list until the master is verified. | |
2480 | ||
2481 | Return values: | |
2482 | 0: nodeid is set in rsb/lkb and the caller should go ahead and use it | |
2483 | 1: the rsb master is not available and the lkb has been placed on | |
2484 | a wait queue | |
2485 | */ | |
2486 | ||
2487 | static int set_master(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2488 | { | |
c04fecb4 | 2489 | int our_nodeid = dlm_our_nodeid(); |
e7fd4179 DT |
2490 | |
2491 | if (rsb_flag(r, RSB_MASTER_UNCERTAIN)) { | |
2492 | rsb_clear_flag(r, RSB_MASTER_UNCERTAIN); | |
2493 | r->res_first_lkid = lkb->lkb_id; | |
2494 | lkb->lkb_nodeid = r->res_nodeid; | |
2495 | return 0; | |
2496 | } | |
2497 | ||
2498 | if (r->res_first_lkid && r->res_first_lkid != lkb->lkb_id) { | |
2499 | list_add_tail(&lkb->lkb_rsb_lookup, &r->res_lookup); | |
2500 | return 1; | |
2501 | } | |
2502 | ||
c04fecb4 | 2503 | if (r->res_master_nodeid == our_nodeid) { |
e7fd4179 DT |
2504 | lkb->lkb_nodeid = 0; |
2505 | return 0; | |
2506 | } | |
2507 | ||
c04fecb4 DT |
2508 | if (r->res_master_nodeid) { |
2509 | lkb->lkb_nodeid = r->res_master_nodeid; | |
e7fd4179 DT |
2510 | return 0; |
2511 | } | |
2512 | ||
c04fecb4 DT |
2513 | if (dlm_dir_nodeid(r) == our_nodeid) { |
2514 | /* This is a somewhat unusual case; find_rsb will usually | |
2515 | have set res_master_nodeid when dir nodeid is local, but | |
2516 | there are cases where we become the dir node after we've | |
2517 | past find_rsb and go through _request_lock again. | |
2518 | confirm_master() or process_lookup_list() needs to be | |
2519 | called after this. */ | |
2520 | log_debug(r->res_ls, "set_master %x self master %d dir %d %s", | |
2521 | lkb->lkb_id, r->res_master_nodeid, r->res_dir_nodeid, | |
2522 | r->res_name); | |
2523 | r->res_master_nodeid = our_nodeid; | |
e7fd4179 DT |
2524 | r->res_nodeid = 0; |
2525 | lkb->lkb_nodeid = 0; | |
c04fecb4 | 2526 | return 0; |
e7fd4179 | 2527 | } |
c04fecb4 DT |
2528 | |
2529 | r->res_first_lkid = lkb->lkb_id; | |
2530 | send_lookup(r, lkb); | |
2531 | return 1; | |
e7fd4179 DT |
2532 | } |
2533 | ||
2534 | static void process_lookup_list(struct dlm_rsb *r) | |
2535 | { | |
2536 | struct dlm_lkb *lkb, *safe; | |
2537 | ||
2538 | list_for_each_entry_safe(lkb, safe, &r->res_lookup, lkb_rsb_lookup) { | |
ef0c2bb0 | 2539 | list_del_init(&lkb->lkb_rsb_lookup); |
e7fd4179 DT |
2540 | _request_lock(r, lkb); |
2541 | schedule(); | |
2542 | } | |
2543 | } | |
2544 | ||
2545 | /* confirm_master -- confirm (or deny) an rsb's master nodeid */ | |
2546 | ||
2547 | static void confirm_master(struct dlm_rsb *r, int error) | |
2548 | { | |
2549 | struct dlm_lkb *lkb; | |
2550 | ||
2551 | if (!r->res_first_lkid) | |
2552 | return; | |
2553 | ||
2554 | switch (error) { | |
2555 | case 0: | |
2556 | case -EINPROGRESS: | |
2557 | r->res_first_lkid = 0; | |
2558 | process_lookup_list(r); | |
2559 | break; | |
2560 | ||
2561 | case -EAGAIN: | |
aec64e1b DT |
2562 | case -EBADR: |
2563 | case -ENOTBLK: | |
2564 | /* the remote request failed and won't be retried (it was | |
2565 | a NOQUEUE, or has been canceled/unlocked); make a waiting | |
2566 | lkb the first_lkid */ | |
e7fd4179 DT |
2567 | |
2568 | r->res_first_lkid = 0; | |
2569 | ||
2570 | if (!list_empty(&r->res_lookup)) { | |
2571 | lkb = list_entry(r->res_lookup.next, struct dlm_lkb, | |
2572 | lkb_rsb_lookup); | |
ef0c2bb0 | 2573 | list_del_init(&lkb->lkb_rsb_lookup); |
e7fd4179 DT |
2574 | r->res_first_lkid = lkb->lkb_id; |
2575 | _request_lock(r, lkb); | |
761b9d3f | 2576 | } |
e7fd4179 DT |
2577 | break; |
2578 | ||
2579 | default: | |
2580 | log_error(r->res_ls, "confirm_master unknown error %d", error); | |
2581 | } | |
2582 | } | |
2583 | ||
6b0afc0c AA |
2584 | static int set_lock_args(int mode, struct dlm_lksb *lksb, uint32_t flags, |
2585 | int namelen, void (*ast)(void *astparam), | |
2586 | void *astparam, | |
2587 | void (*bast)(void *astparam, int mode), | |
2588 | struct dlm_args *args) | |
e7fd4179 DT |
2589 | { |
2590 | int rv = -EINVAL; | |
2591 | ||
2592 | /* check for invalid arg usage */ | |
2593 | ||
2594 | if (mode < 0 || mode > DLM_LOCK_EX) | |
2595 | goto out; | |
2596 | ||
2597 | if (!(flags & DLM_LKF_CONVERT) && (namelen > DLM_RESNAME_MAXLEN)) | |
2598 | goto out; | |
2599 | ||
2600 | if (flags & DLM_LKF_CANCEL) | |
2601 | goto out; | |
2602 | ||
2603 | if (flags & DLM_LKF_QUECVT && !(flags & DLM_LKF_CONVERT)) | |
2604 | goto out; | |
2605 | ||
2606 | if (flags & DLM_LKF_CONVDEADLK && !(flags & DLM_LKF_CONVERT)) | |
2607 | goto out; | |
2608 | ||
2609 | if (flags & DLM_LKF_CONVDEADLK && flags & DLM_LKF_NOQUEUE) | |
2610 | goto out; | |
2611 | ||
2612 | if (flags & DLM_LKF_EXPEDITE && flags & DLM_LKF_CONVERT) | |
2613 | goto out; | |
2614 | ||
2615 | if (flags & DLM_LKF_EXPEDITE && flags & DLM_LKF_QUECVT) | |
2616 | goto out; | |
2617 | ||
2618 | if (flags & DLM_LKF_EXPEDITE && flags & DLM_LKF_NOQUEUE) | |
2619 | goto out; | |
2620 | ||
2621 | if (flags & DLM_LKF_EXPEDITE && mode != DLM_LOCK_NL) | |
2622 | goto out; | |
2623 | ||
2624 | if (!ast || !lksb) | |
2625 | goto out; | |
2626 | ||
2627 | if (flags & DLM_LKF_VALBLK && !lksb->sb_lvbptr) | |
2628 | goto out; | |
2629 | ||
e7fd4179 DT |
2630 | if (flags & DLM_LKF_CONVERT && !lksb->sb_lkid) |
2631 | goto out; | |
2632 | ||
2633 | /* these args will be copied to the lkb in validate_lock_args, | |
2634 | it cannot be done now because when converting locks, fields in | |
2635 | an active lkb cannot be modified before locking the rsb */ | |
2636 | ||
2637 | args->flags = flags; | |
e5dae548 DT |
2638 | args->astfn = ast; |
2639 | args->astparam = astparam; | |
2640 | args->bastfn = bast; | |
e7fd4179 DT |
2641 | args->mode = mode; |
2642 | args->lksb = lksb; | |
e7fd4179 DT |
2643 | rv = 0; |
2644 | out: | |
2645 | return rv; | |
2646 | } | |
2647 | ||
2648 | static int set_unlock_args(uint32_t flags, void *astarg, struct dlm_args *args) | |
2649 | { | |
2650 | if (flags & ~(DLM_LKF_CANCEL | DLM_LKF_VALBLK | DLM_LKF_IVVALBLK | | |
2651 | DLM_LKF_FORCEUNLOCK)) | |
2652 | return -EINVAL; | |
2653 | ||
ef0c2bb0 DT |
2654 | if (flags & DLM_LKF_CANCEL && flags & DLM_LKF_FORCEUNLOCK) |
2655 | return -EINVAL; | |
2656 | ||
e7fd4179 | 2657 | args->flags = flags; |
e5dae548 | 2658 | args->astparam = astarg; |
e7fd4179 DT |
2659 | return 0; |
2660 | } | |
2661 | ||
2662 | static int validate_lock_args(struct dlm_ls *ls, struct dlm_lkb *lkb, | |
2663 | struct dlm_args *args) | |
2664 | { | |
44637ca4 | 2665 | int rv = -EBUSY; |
e7fd4179 DT |
2666 | |
2667 | if (args->flags & DLM_LKF_CONVERT) { | |
e7fd4179 DT |
2668 | if (lkb->lkb_status != DLM_LKSTS_GRANTED) |
2669 | goto out; | |
2670 | ||
67e4d8c5 AA |
2671 | /* lock not allowed if there's any op in progress */ |
2672 | if (lkb->lkb_wait_type || lkb->lkb_wait_count) | |
e7fd4179 | 2673 | goto out; |
ef0c2bb0 DT |
2674 | |
2675 | if (is_overlap(lkb)) | |
2676 | goto out; | |
44637ca4 AA |
2677 | |
2678 | rv = -EINVAL; | |
e1af8728 | 2679 | if (test_bit(DLM_IFL_MSTCPY_BIT, &lkb->lkb_iflags)) |
44637ca4 AA |
2680 | goto out; |
2681 | ||
2682 | if (args->flags & DLM_LKF_QUECVT && | |
2683 | !__quecvt_compat_matrix[lkb->lkb_grmode+1][args->mode+1]) | |
2684 | goto out; | |
e7fd4179 DT |
2685 | } |
2686 | ||
2687 | lkb->lkb_exflags = args->flags; | |
1361737f | 2688 | dlm_set_sbflags_val(lkb, 0); |
e5dae548 | 2689 | lkb->lkb_astfn = args->astfn; |
e7fd4179 | 2690 | lkb->lkb_astparam = args->astparam; |
e5dae548 | 2691 | lkb->lkb_bastfn = args->bastfn; |
e7fd4179 DT |
2692 | lkb->lkb_rqmode = args->mode; |
2693 | lkb->lkb_lksb = args->lksb; | |
2694 | lkb->lkb_lvbptr = args->lksb->sb_lvbptr; | |
2695 | lkb->lkb_ownpid = (int) current->pid; | |
e7fd4179 DT |
2696 | rv = 0; |
2697 | out: | |
9ac8ba46 AA |
2698 | switch (rv) { |
2699 | case 0: | |
2700 | break; | |
2701 | case -EINVAL: | |
2702 | /* annoy the user because dlm usage is wrong */ | |
2703 | WARN_ON(1); | |
2704 | log_error(ls, "%s %d %x %x %x %d %d %s", __func__, | |
e1af8728 | 2705 | rv, lkb->lkb_id, dlm_iflags_val(lkb), args->flags, |
9ac8ba46 AA |
2706 | lkb->lkb_status, lkb->lkb_wait_type, |
2707 | lkb->lkb_resource->res_name); | |
2708 | break; | |
2709 | default: | |
c2d76a62 | 2710 | log_debug(ls, "%s %d %x %x %x %d %d %s", __func__, |
e1af8728 | 2711 | rv, lkb->lkb_id, dlm_iflags_val(lkb), args->flags, |
43279e53 DT |
2712 | lkb->lkb_status, lkb->lkb_wait_type, |
2713 | lkb->lkb_resource->res_name); | |
9ac8ba46 AA |
2714 | break; |
2715 | } | |
2716 | ||
e7fd4179 DT |
2717 | return rv; |
2718 | } | |
2719 | ||
ef0c2bb0 DT |
2720 | /* when dlm_unlock() sees -EBUSY with CANCEL/FORCEUNLOCK it returns 0 |
2721 | for success */ | |
2722 | ||
2723 | /* note: it's valid for lkb_nodeid/res_nodeid to be -1 when we get here | |
2724 | because there may be a lookup in progress and it's valid to do | |
2725 | cancel/unlockf on it */ | |
2726 | ||
e7fd4179 DT |
2727 | static int validate_unlock_args(struct dlm_lkb *lkb, struct dlm_args *args) |
2728 | { | |
ef0c2bb0 | 2729 | struct dlm_ls *ls = lkb->lkb_resource->res_ls; |
420ba3cd | 2730 | int rv = -EBUSY; |
e7fd4179 | 2731 | |
420ba3cd AA |
2732 | /* normal unlock not allowed if there's any op in progress */ |
2733 | if (!(args->flags & (DLM_LKF_CANCEL | DLM_LKF_FORCEUNLOCK)) && | |
2734 | (lkb->lkb_wait_type || lkb->lkb_wait_count)) | |
e7fd4179 DT |
2735 | goto out; |
2736 | ||
ef0c2bb0 DT |
2737 | /* an lkb may be waiting for an rsb lookup to complete where the |
2738 | lookup was initiated by another lock */ | |
2739 | ||
42dc1601 DT |
2740 | if (!list_empty(&lkb->lkb_rsb_lookup)) { |
2741 | if (args->flags & (DLM_LKF_CANCEL | DLM_LKF_FORCEUNLOCK)) { | |
ef0c2bb0 DT |
2742 | log_debug(ls, "unlock on rsb_lookup %x", lkb->lkb_id); |
2743 | list_del_init(&lkb->lkb_rsb_lookup); | |
2744 | queue_cast(lkb->lkb_resource, lkb, | |
2745 | args->flags & DLM_LKF_CANCEL ? | |
2746 | -DLM_ECANCEL : -DLM_EUNLOCK); | |
2747 | unhold_lkb(lkb); /* undoes create_lkb() */ | |
ef0c2bb0 | 2748 | } |
42dc1601 | 2749 | /* caller changes -EBUSY to 0 for CANCEL and FORCEUNLOCK */ |
420ba3cd AA |
2750 | goto out; |
2751 | } | |
2752 | ||
2753 | rv = -EINVAL; | |
e1af8728 | 2754 | if (test_bit(DLM_IFL_MSTCPY_BIT, &lkb->lkb_iflags)) { |
420ba3cd AA |
2755 | log_error(ls, "unlock on MSTCPY %x", lkb->lkb_id); |
2756 | dlm_print_lkb(lkb); | |
2757 | goto out; | |
2758 | } | |
2759 | ||
2760 | /* an lkb may still exist even though the lock is EOL'ed due to a | |
2761 | * cancel, unlock or failed noqueue request; an app can't use these | |
2762 | * locks; return same error as if the lkid had not been found at all | |
2763 | */ | |
2764 | ||
e1af8728 | 2765 | if (test_bit(DLM_IFL_ENDOFLIFE_BIT, &lkb->lkb_iflags)) { |
420ba3cd AA |
2766 | log_debug(ls, "unlock on ENDOFLIFE %x", lkb->lkb_id); |
2767 | rv = -ENOENT; | |
42dc1601 | 2768 | goto out; |
ef0c2bb0 DT |
2769 | } |
2770 | ||
2771 | /* cancel not allowed with another cancel/unlock in progress */ | |
2772 | ||
2773 | if (args->flags & DLM_LKF_CANCEL) { | |
2774 | if (lkb->lkb_exflags & DLM_LKF_CANCEL) | |
2775 | goto out; | |
2776 | ||
2777 | if (is_overlap(lkb)) | |
2778 | goto out; | |
2779 | ||
e1af8728 AA |
2780 | if (test_bit(DLM_IFL_RESEND_BIT, &lkb->lkb_iflags)) { |
2781 | set_bit(DLM_IFL_OVERLAP_CANCEL_BIT, &lkb->lkb_iflags); | |
ef0c2bb0 DT |
2782 | rv = -EBUSY; |
2783 | goto out; | |
2784 | } | |
2785 | ||
a536e381 DT |
2786 | /* there's nothing to cancel */ |
2787 | if (lkb->lkb_status == DLM_LKSTS_GRANTED && | |
2788 | !lkb->lkb_wait_type) { | |
2789 | rv = -EBUSY; | |
2790 | goto out; | |
2791 | } | |
2792 | ||
ef0c2bb0 DT |
2793 | switch (lkb->lkb_wait_type) { |
2794 | case DLM_MSG_LOOKUP: | |
2795 | case DLM_MSG_REQUEST: | |
e1af8728 | 2796 | set_bit(DLM_IFL_OVERLAP_CANCEL_BIT, &lkb->lkb_iflags); |
ef0c2bb0 DT |
2797 | rv = -EBUSY; |
2798 | goto out; | |
2799 | case DLM_MSG_UNLOCK: | |
2800 | case DLM_MSG_CANCEL: | |
2801 | goto out; | |
2802 | } | |
2803 | /* add_to_waiters() will set OVERLAP_CANCEL */ | |
2804 | goto out_ok; | |
2805 | } | |
2806 | ||
2807 | /* do we need to allow a force-unlock if there's a normal unlock | |
2808 | already in progress? in what conditions could the normal unlock | |
2809 | fail such that we'd want to send a force-unlock to be sure? */ | |
2810 | ||
2811 | if (args->flags & DLM_LKF_FORCEUNLOCK) { | |
2812 | if (lkb->lkb_exflags & DLM_LKF_FORCEUNLOCK) | |
2813 | goto out; | |
2814 | ||
2815 | if (is_overlap_unlock(lkb)) | |
2816 | goto out; | |
e7fd4179 | 2817 | |
e1af8728 AA |
2818 | if (test_bit(DLM_IFL_RESEND_BIT, &lkb->lkb_iflags)) { |
2819 | set_bit(DLM_IFL_OVERLAP_UNLOCK_BIT, &lkb->lkb_iflags); | |
ef0c2bb0 DT |
2820 | rv = -EBUSY; |
2821 | goto out; | |
2822 | } | |
2823 | ||
2824 | switch (lkb->lkb_wait_type) { | |
2825 | case DLM_MSG_LOOKUP: | |
2826 | case DLM_MSG_REQUEST: | |
e1af8728 | 2827 | set_bit(DLM_IFL_OVERLAP_UNLOCK_BIT, &lkb->lkb_iflags); |
ef0c2bb0 DT |
2828 | rv = -EBUSY; |
2829 | goto out; | |
2830 | case DLM_MSG_UNLOCK: | |
2831 | goto out; | |
2832 | } | |
2833 | /* add_to_waiters() will set OVERLAP_UNLOCK */ | |
ef0c2bb0 DT |
2834 | } |
2835 | ||
e7fd4179 | 2836 | out_ok: |
ef0c2bb0 DT |
2837 | /* an overlapping op shouldn't blow away exflags from other op */ |
2838 | lkb->lkb_exflags |= args->flags; | |
1361737f | 2839 | dlm_set_sbflags_val(lkb, 0); |
e7fd4179 | 2840 | lkb->lkb_astparam = args->astparam; |
e7fd4179 DT |
2841 | rv = 0; |
2842 | out: | |
9ac8ba46 AA |
2843 | switch (rv) { |
2844 | case 0: | |
2845 | break; | |
2846 | case -EINVAL: | |
2847 | /* annoy the user because dlm usage is wrong */ | |
2848 | WARN_ON(1); | |
2849 | log_error(ls, "%s %d %x %x %x %x %d %s", __func__, rv, | |
e1af8728 | 2850 | lkb->lkb_id, dlm_iflags_val(lkb), lkb->lkb_exflags, |
9ac8ba46 AA |
2851 | args->flags, lkb->lkb_wait_type, |
2852 | lkb->lkb_resource->res_name); | |
2853 | break; | |
2854 | default: | |
c2d76a62 | 2855 | log_debug(ls, "%s %d %x %x %x %x %d %s", __func__, rv, |
e1af8728 | 2856 | lkb->lkb_id, dlm_iflags_val(lkb), lkb->lkb_exflags, |
ef0c2bb0 DT |
2857 | args->flags, lkb->lkb_wait_type, |
2858 | lkb->lkb_resource->res_name); | |
9ac8ba46 AA |
2859 | break; |
2860 | } | |
2861 | ||
e7fd4179 DT |
2862 | return rv; |
2863 | } | |
2864 | ||
2865 | /* | |
2866 | * Four stage 4 varieties: | |
2867 | * do_request(), do_convert(), do_unlock(), do_cancel() | |
2868 | * These are called on the master node for the given lock and | |
2869 | * from the central locking logic. | |
2870 | */ | |
2871 | ||
2872 | static int do_request(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
2873 | { | |
2874 | int error = 0; | |
2875 | ||
c503a621 | 2876 | if (can_be_granted(r, lkb, 1, 0, NULL)) { |
e7fd4179 DT |
2877 | grant_lock(r, lkb); |
2878 | queue_cast(r, lkb, 0); | |
2879 | goto out; | |
2880 | } | |
2881 | ||
2882 | if (can_be_queued(lkb)) { | |
2883 | error = -EINPROGRESS; | |
2884 | add_lkb(r, lkb, DLM_LKSTS_WAITING); | |
e7fd4179 DT |
2885 | goto out; |
2886 | } | |
2887 | ||
2888 | error = -EAGAIN; | |
e7fd4179 | 2889 | queue_cast(r, lkb, -EAGAIN); |
e7fd4179 DT |
2890 | out: |
2891 | return error; | |
2892 | } | |
2893 | ||
cf6620ac DT |
2894 | static void do_request_effects(struct dlm_rsb *r, struct dlm_lkb *lkb, |
2895 | int error) | |
2896 | { | |
2897 | switch (error) { | |
2898 | case -EAGAIN: | |
2899 | if (force_blocking_asts(lkb)) | |
2900 | send_blocking_asts_all(r, lkb); | |
2901 | break; | |
2902 | case -EINPROGRESS: | |
2903 | send_blocking_asts(r, lkb); | |
2904 | break; | |
2905 | } | |
2906 | } | |
2907 | ||
e7fd4179 DT |
2908 | static int do_convert(struct dlm_rsb *r, struct dlm_lkb *lkb) |
2909 | { | |
2910 | int error = 0; | |
c85d65e9 | 2911 | int deadlk = 0; |
e7fd4179 DT |
2912 | |
2913 | /* changing an existing lock may allow others to be granted */ | |
2914 | ||
c503a621 | 2915 | if (can_be_granted(r, lkb, 1, 0, &deadlk)) { |
e7fd4179 DT |
2916 | grant_lock(r, lkb); |
2917 | queue_cast(r, lkb, 0); | |
e7fd4179 DT |
2918 | goto out; |
2919 | } | |
2920 | ||
c85d65e9 DT |
2921 | /* can_be_granted() detected that this lock would block in a conversion |
2922 | deadlock, so we leave it on the granted queue and return EDEADLK in | |
2923 | the ast for the convert. */ | |
2924 | ||
294e7e45 | 2925 | if (deadlk && !(lkb->lkb_exflags & DLM_LKF_NODLCKWT)) { |
c85d65e9 | 2926 | /* it's left on the granted queue */ |
c85d65e9 DT |
2927 | revert_lock(r, lkb); |
2928 | queue_cast(r, lkb, -EDEADLK); | |
2929 | error = -EDEADLK; | |
2930 | goto out; | |
2931 | } | |
2932 | ||
7d3c1feb DT |
2933 | /* is_demoted() means the can_be_granted() above set the grmode |
2934 | to NL, and left us on the granted queue. This auto-demotion | |
2935 | (due to CONVDEADLK) might mean other locks, and/or this lock, are | |
2936 | now grantable. We have to try to grant other converting locks | |
2937 | before we try again to grant this one. */ | |
2938 | ||
2939 | if (is_demoted(lkb)) { | |
4875647a | 2940 | grant_pending_convert(r, DLM_LOCK_IV, NULL, NULL); |
c503a621 | 2941 | if (_can_be_granted(r, lkb, 1, 0)) { |
7d3c1feb DT |
2942 | grant_lock(r, lkb); |
2943 | queue_cast(r, lkb, 0); | |
7d3c1feb DT |
2944 | goto out; |
2945 | } | |
2946 | /* else fall through and move to convert queue */ | |
2947 | } | |
2948 | ||
2949 | if (can_be_queued(lkb)) { | |
e7fd4179 DT |
2950 | error = -EINPROGRESS; |
2951 | del_lkb(r, lkb); | |
2952 | add_lkb(r, lkb, DLM_LKSTS_CONVERT); | |
e7fd4179 DT |
2953 | goto out; |
2954 | } | |
2955 | ||
2956 | error = -EAGAIN; | |
e7fd4179 | 2957 | queue_cast(r, lkb, -EAGAIN); |
e7fd4179 DT |
2958 | out: |
2959 | return error; | |
2960 | } | |
2961 | ||
cf6620ac DT |
2962 | static void do_convert_effects(struct dlm_rsb *r, struct dlm_lkb *lkb, |
2963 | int error) | |
2964 | { | |
2965 | switch (error) { | |
2966 | case 0: | |
4875647a | 2967 | grant_pending_locks(r, NULL); |
cf6620ac DT |
2968 | /* grant_pending_locks also sends basts */ |
2969 | break; | |
2970 | case -EAGAIN: | |
2971 | if (force_blocking_asts(lkb)) | |
2972 | send_blocking_asts_all(r, lkb); | |
2973 | break; | |
2974 | case -EINPROGRESS: | |
2975 | send_blocking_asts(r, lkb); | |
2976 | break; | |
2977 | } | |
2978 | } | |
2979 | ||
e7fd4179 DT |
2980 | static int do_unlock(struct dlm_rsb *r, struct dlm_lkb *lkb) |
2981 | { | |
2982 | remove_lock(r, lkb); | |
2983 | queue_cast(r, lkb, -DLM_EUNLOCK); | |
e7fd4179 DT |
2984 | return -DLM_EUNLOCK; |
2985 | } | |
2986 | ||
cf6620ac DT |
2987 | static void do_unlock_effects(struct dlm_rsb *r, struct dlm_lkb *lkb, |
2988 | int error) | |
2989 | { | |
4875647a | 2990 | grant_pending_locks(r, NULL); |
cf6620ac DT |
2991 | } |
2992 | ||
ef0c2bb0 | 2993 | /* returns: 0 did nothing, -DLM_ECANCEL canceled lock */ |
c04fecb4 | 2994 | |
e7fd4179 DT |
2995 | static int do_cancel(struct dlm_rsb *r, struct dlm_lkb *lkb) |
2996 | { | |
ef0c2bb0 DT |
2997 | int error; |
2998 | ||
2999 | error = revert_lock(r, lkb); | |
3000 | if (error) { | |
3001 | queue_cast(r, lkb, -DLM_ECANCEL); | |
ef0c2bb0 DT |
3002 | return -DLM_ECANCEL; |
3003 | } | |
3004 | return 0; | |
e7fd4179 DT |
3005 | } |
3006 | ||
cf6620ac DT |
3007 | static void do_cancel_effects(struct dlm_rsb *r, struct dlm_lkb *lkb, |
3008 | int error) | |
3009 | { | |
3010 | if (error) | |
4875647a | 3011 | grant_pending_locks(r, NULL); |
cf6620ac DT |
3012 | } |
3013 | ||
e7fd4179 DT |
3014 | /* |
3015 | * Four stage 3 varieties: | |
3016 | * _request_lock(), _convert_lock(), _unlock_lock(), _cancel_lock() | |
3017 | */ | |
3018 | ||
3019 | /* add a new lkb to a possibly new rsb, called by requesting process */ | |
3020 | ||
3021 | static int _request_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
3022 | { | |
3023 | int error; | |
3024 | ||
3025 | /* set_master: sets lkb nodeid from r */ | |
3026 | ||
3027 | error = set_master(r, lkb); | |
3028 | if (error < 0) | |
3029 | goto out; | |
3030 | if (error) { | |
3031 | error = 0; | |
3032 | goto out; | |
3033 | } | |
3034 | ||
cf6620ac | 3035 | if (is_remote(r)) { |
e7fd4179 DT |
3036 | /* receive_request() calls do_request() on remote node */ |
3037 | error = send_request(r, lkb); | |
cf6620ac | 3038 | } else { |
e7fd4179 | 3039 | error = do_request(r, lkb); |
cf6620ac DT |
3040 | /* for remote locks the request_reply is sent |
3041 | between do_request and do_request_effects */ | |
3042 | do_request_effects(r, lkb, error); | |
3043 | } | |
e7fd4179 DT |
3044 | out: |
3045 | return error; | |
3046 | } | |
3047 | ||
3bcd3687 | 3048 | /* change some property of an existing lkb, e.g. mode */ |
e7fd4179 DT |
3049 | |
3050 | static int _convert_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
3051 | { | |
3052 | int error; | |
3053 | ||
cf6620ac | 3054 | if (is_remote(r)) { |
e7fd4179 DT |
3055 | /* receive_convert() calls do_convert() on remote node */ |
3056 | error = send_convert(r, lkb); | |
cf6620ac | 3057 | } else { |
e7fd4179 | 3058 | error = do_convert(r, lkb); |
cf6620ac DT |
3059 | /* for remote locks the convert_reply is sent |
3060 | between do_convert and do_convert_effects */ | |
3061 | do_convert_effects(r, lkb, error); | |
3062 | } | |
e7fd4179 DT |
3063 | |
3064 | return error; | |
3065 | } | |
3066 | ||
3067 | /* remove an existing lkb from the granted queue */ | |
3068 | ||
3069 | static int _unlock_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
3070 | { | |
3071 | int error; | |
3072 | ||
cf6620ac | 3073 | if (is_remote(r)) { |
e7fd4179 DT |
3074 | /* receive_unlock() calls do_unlock() on remote node */ |
3075 | error = send_unlock(r, lkb); | |
cf6620ac | 3076 | } else { |
e7fd4179 | 3077 | error = do_unlock(r, lkb); |
cf6620ac DT |
3078 | /* for remote locks the unlock_reply is sent |
3079 | between do_unlock and do_unlock_effects */ | |
3080 | do_unlock_effects(r, lkb, error); | |
3081 | } | |
e7fd4179 DT |
3082 | |
3083 | return error; | |
3084 | } | |
3085 | ||
3086 | /* remove an existing lkb from the convert or wait queue */ | |
3087 | ||
3088 | static int _cancel_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
3089 | { | |
3090 | int error; | |
3091 | ||
cf6620ac | 3092 | if (is_remote(r)) { |
e7fd4179 DT |
3093 | /* receive_cancel() calls do_cancel() on remote node */ |
3094 | error = send_cancel(r, lkb); | |
cf6620ac | 3095 | } else { |
e7fd4179 | 3096 | error = do_cancel(r, lkb); |
cf6620ac DT |
3097 | /* for remote locks the cancel_reply is sent |
3098 | between do_cancel and do_cancel_effects */ | |
3099 | do_cancel_effects(r, lkb, error); | |
3100 | } | |
e7fd4179 DT |
3101 | |
3102 | return error; | |
3103 | } | |
3104 | ||
3105 | /* | |
3106 | * Four stage 2 varieties: | |
3107 | * request_lock(), convert_lock(), unlock_lock(), cancel_lock() | |
3108 | */ | |
3109 | ||
56171e0d AA |
3110 | static int request_lock(struct dlm_ls *ls, struct dlm_lkb *lkb, |
3111 | const void *name, int len, | |
3112 | struct dlm_args *args) | |
e7fd4179 DT |
3113 | { |
3114 | struct dlm_rsb *r; | |
3115 | int error; | |
3116 | ||
3117 | error = validate_lock_args(ls, lkb, args); | |
3118 | if (error) | |
c04fecb4 | 3119 | return error; |
e7fd4179 | 3120 | |
c04fecb4 | 3121 | error = find_rsb(ls, name, len, 0, R_REQUEST, &r); |
e7fd4179 | 3122 | if (error) |
c04fecb4 | 3123 | return error; |
e7fd4179 DT |
3124 | |
3125 | lock_rsb(r); | |
3126 | ||
3127 | attach_lkb(r, lkb); | |
3128 | lkb->lkb_lksb->sb_lkid = lkb->lkb_id; | |
3129 | ||
3130 | error = _request_lock(r, lkb); | |
3131 | ||
3132 | unlock_rsb(r); | |
3133 | put_rsb(r); | |
e7fd4179 DT |
3134 | return error; |
3135 | } | |
3136 | ||
3137 | static int convert_lock(struct dlm_ls *ls, struct dlm_lkb *lkb, | |
3138 | struct dlm_args *args) | |
3139 | { | |
3140 | struct dlm_rsb *r; | |
3141 | int error; | |
3142 | ||
3143 | r = lkb->lkb_resource; | |
3144 | ||
3145 | hold_rsb(r); | |
3146 | lock_rsb(r); | |
3147 | ||
3148 | error = validate_lock_args(ls, lkb, args); | |
3149 | if (error) | |
3150 | goto out; | |
3151 | ||
3152 | error = _convert_lock(r, lkb); | |
3153 | out: | |
3154 | unlock_rsb(r); | |
3155 | put_rsb(r); | |
3156 | return error; | |
3157 | } | |
3158 | ||
3159 | static int unlock_lock(struct dlm_ls *ls, struct dlm_lkb *lkb, | |
3160 | struct dlm_args *args) | |
3161 | { | |
3162 | struct dlm_rsb *r; | |
3163 | int error; | |
3164 | ||
3165 | r = lkb->lkb_resource; | |
3166 | ||
3167 | hold_rsb(r); | |
3168 | lock_rsb(r); | |
3169 | ||
3170 | error = validate_unlock_args(lkb, args); | |
3171 | if (error) | |
3172 | goto out; | |
3173 | ||
3174 | error = _unlock_lock(r, lkb); | |
3175 | out: | |
3176 | unlock_rsb(r); | |
3177 | put_rsb(r); | |
3178 | return error; | |
3179 | } | |
3180 | ||
3181 | static int cancel_lock(struct dlm_ls *ls, struct dlm_lkb *lkb, | |
3182 | struct dlm_args *args) | |
3183 | { | |
3184 | struct dlm_rsb *r; | |
3185 | int error; | |
3186 | ||
3187 | r = lkb->lkb_resource; | |
3188 | ||
3189 | hold_rsb(r); | |
3190 | lock_rsb(r); | |
3191 | ||
3192 | error = validate_unlock_args(lkb, args); | |
3193 | if (error) | |
3194 | goto out; | |
3195 | ||
3196 | error = _cancel_lock(r, lkb); | |
3197 | out: | |
3198 | unlock_rsb(r); | |
3199 | put_rsb(r); | |
3200 | return error; | |
3201 | } | |
3202 | ||
3203 | /* | |
3204 | * Two stage 1 varieties: dlm_lock() and dlm_unlock() | |
3205 | */ | |
3206 | ||
3207 | int dlm_lock(dlm_lockspace_t *lockspace, | |
3208 | int mode, | |
3209 | struct dlm_lksb *lksb, | |
3210 | uint32_t flags, | |
56171e0d | 3211 | const void *name, |
e7fd4179 DT |
3212 | unsigned int namelen, |
3213 | uint32_t parent_lkid, | |
3214 | void (*ast) (void *astarg), | |
3215 | void *astarg, | |
3bcd3687 | 3216 | void (*bast) (void *astarg, int mode)) |
e7fd4179 DT |
3217 | { |
3218 | struct dlm_ls *ls; | |
3219 | struct dlm_lkb *lkb; | |
3220 | struct dlm_args args; | |
3221 | int error, convert = flags & DLM_LKF_CONVERT; | |
3222 | ||
3223 | ls = dlm_find_lockspace_local(lockspace); | |
3224 | if (!ls) | |
3225 | return -EINVAL; | |
3226 | ||
85e86edf | 3227 | dlm_lock_recovery(ls); |
e7fd4179 DT |
3228 | |
3229 | if (convert) | |
3230 | error = find_lkb(ls, lksb->sb_lkid, &lkb); | |
3231 | else | |
3232 | error = create_lkb(ls, &lkb); | |
3233 | ||
3234 | if (error) | |
3235 | goto out; | |
3236 | ||
5d92a30e | 3237 | trace_dlm_lock_start(ls, lkb, name, namelen, mode, flags); |
f1d3b8f9 | 3238 | |
6b0afc0c AA |
3239 | error = set_lock_args(mode, lksb, flags, namelen, ast, astarg, bast, |
3240 | &args); | |
e7fd4179 DT |
3241 | if (error) |
3242 | goto out_put; | |
3243 | ||
3244 | if (convert) | |
3245 | error = convert_lock(ls, lkb, &args); | |
3246 | else | |
3247 | error = request_lock(ls, lkb, name, namelen, &args); | |
3248 | ||
3249 | if (error == -EINPROGRESS) | |
3250 | error = 0; | |
3251 | out_put: | |
7a3de732 | 3252 | trace_dlm_lock_end(ls, lkb, name, namelen, mode, flags, error, true); |
f1d3b8f9 | 3253 | |
e7fd4179 | 3254 | if (convert || error) |
b3f58d8f | 3255 | __put_lkb(ls, lkb); |
c85d65e9 | 3256 | if (error == -EAGAIN || error == -EDEADLK) |
e7fd4179 DT |
3257 | error = 0; |
3258 | out: | |
85e86edf | 3259 | dlm_unlock_recovery(ls); |
e7fd4179 DT |
3260 | dlm_put_lockspace(ls); |
3261 | return error; | |
3262 | } | |
3263 | ||
3264 | int dlm_unlock(dlm_lockspace_t *lockspace, | |
3265 | uint32_t lkid, | |
3266 | uint32_t flags, | |
3267 | struct dlm_lksb *lksb, | |
3268 | void *astarg) | |
3269 | { | |
3270 | struct dlm_ls *ls; | |
3271 | struct dlm_lkb *lkb; | |
3272 | struct dlm_args args; | |
3273 | int error; | |
3274 | ||
3275 | ls = dlm_find_lockspace_local(lockspace); | |
3276 | if (!ls) | |
3277 | return -EINVAL; | |
3278 | ||
85e86edf | 3279 | dlm_lock_recovery(ls); |
e7fd4179 DT |
3280 | |
3281 | error = find_lkb(ls, lkid, &lkb); | |
3282 | if (error) | |
3283 | goto out; | |
3284 | ||
f1d3b8f9 AA |
3285 | trace_dlm_unlock_start(ls, lkb, flags); |
3286 | ||
e7fd4179 DT |
3287 | error = set_unlock_args(flags, astarg, &args); |
3288 | if (error) | |
3289 | goto out_put; | |
3290 | ||
3291 | if (flags & DLM_LKF_CANCEL) | |
3292 | error = cancel_lock(ls, lkb, &args); | |
3293 | else | |
3294 | error = unlock_lock(ls, lkb, &args); | |
3295 | ||
3296 | if (error == -DLM_EUNLOCK || error == -DLM_ECANCEL) | |
3297 | error = 0; | |
ef0c2bb0 DT |
3298 | if (error == -EBUSY && (flags & (DLM_LKF_CANCEL | DLM_LKF_FORCEUNLOCK))) |
3299 | error = 0; | |
e7fd4179 | 3300 | out_put: |
f1d3b8f9 AA |
3301 | trace_dlm_unlock_end(ls, lkb, flags, error); |
3302 | ||
b3f58d8f | 3303 | dlm_put_lkb(lkb); |
e7fd4179 | 3304 | out: |
85e86edf | 3305 | dlm_unlock_recovery(ls); |
e7fd4179 DT |
3306 | dlm_put_lockspace(ls); |
3307 | return error; | |
3308 | } | |
3309 | ||
3310 | /* | |
3311 | * send/receive routines for remote operations and replies | |
3312 | * | |
3313 | * send_args | |
3314 | * send_common | |
3315 | * send_request receive_request | |
3316 | * send_convert receive_convert | |
3317 | * send_unlock receive_unlock | |
3318 | * send_cancel receive_cancel | |
3319 | * send_grant receive_grant | |
3320 | * send_bast receive_bast | |
3321 | * send_lookup receive_lookup | |
3322 | * send_remove receive_remove | |
3323 | * | |
3324 | * send_common_reply | |
3325 | * receive_request_reply send_request_reply | |
3326 | * receive_convert_reply send_convert_reply | |
3327 | * receive_unlock_reply send_unlock_reply | |
3328 | * receive_cancel_reply send_cancel_reply | |
3329 | * receive_lookup_reply send_lookup_reply | |
3330 | */ | |
3331 | ||
7e4dac33 DT |
3332 | static int _create_message(struct dlm_ls *ls, int mb_len, |
3333 | int to_nodeid, int mstype, | |
3334 | struct dlm_message **ms_ret, | |
e1711fe3 AA |
3335 | struct dlm_mhandle **mh_ret, |
3336 | gfp_t allocation) | |
e7fd4179 DT |
3337 | { |
3338 | struct dlm_message *ms; | |
3339 | struct dlm_mhandle *mh; | |
3340 | char *mb; | |
e7fd4179 DT |
3341 | |
3342 | /* get_buffer gives us a message handle (mh) that we need to | |
a070a91c | 3343 | pass into midcomms_commit and a message buffer (mb) that we |
e7fd4179 DT |
3344 | write our data into */ |
3345 | ||
e1711fe3 | 3346 | mh = dlm_midcomms_get_mhandle(to_nodeid, mb_len, allocation, &mb); |
e7fd4179 DT |
3347 | if (!mh) |
3348 | return -ENOBUFS; | |
3349 | ||
e7fd4179 DT |
3350 | ms = (struct dlm_message *) mb; |
3351 | ||
3428785a AA |
3352 | ms->m_header.h_version = cpu_to_le32(DLM_HEADER_MAJOR | DLM_HEADER_MINOR); |
3353 | ms->m_header.u.h_lockspace = cpu_to_le32(ls->ls_global_id); | |
3354 | ms->m_header.h_nodeid = cpu_to_le32(dlm_our_nodeid()); | |
3355 | ms->m_header.h_length = cpu_to_le16(mb_len); | |
e7fd4179 DT |
3356 | ms->m_header.h_cmd = DLM_MSG; |
3357 | ||
00e99ccd | 3358 | ms->m_type = cpu_to_le32(mstype); |
e7fd4179 DT |
3359 | |
3360 | *mh_ret = mh; | |
3361 | *ms_ret = ms; | |
3362 | return 0; | |
3363 | } | |
3364 | ||
7e4dac33 DT |
3365 | static int create_message(struct dlm_rsb *r, struct dlm_lkb *lkb, |
3366 | int to_nodeid, int mstype, | |
3367 | struct dlm_message **ms_ret, | |
e1711fe3 AA |
3368 | struct dlm_mhandle **mh_ret, |
3369 | gfp_t allocation) | |
7e4dac33 DT |
3370 | { |
3371 | int mb_len = sizeof(struct dlm_message); | |
3372 | ||
3373 | switch (mstype) { | |
3374 | case DLM_MSG_REQUEST: | |
3375 | case DLM_MSG_LOOKUP: | |
3376 | case DLM_MSG_REMOVE: | |
3377 | mb_len += r->res_length; | |
3378 | break; | |
3379 | case DLM_MSG_CONVERT: | |
3380 | case DLM_MSG_UNLOCK: | |
3381 | case DLM_MSG_REQUEST_REPLY: | |
3382 | case DLM_MSG_CONVERT_REPLY: | |
3383 | case DLM_MSG_GRANT: | |
7a40f1f1 | 3384 | if (lkb && lkb->lkb_lvbptr && (lkb->lkb_exflags & DLM_LKF_VALBLK)) |
7e4dac33 DT |
3385 | mb_len += r->res_ls->ls_lvblen; |
3386 | break; | |
3387 | } | |
3388 | ||
3389 | return _create_message(r->res_ls, mb_len, to_nodeid, mstype, | |
e1711fe3 | 3390 | ms_ret, mh_ret, allocation); |
7e4dac33 DT |
3391 | } |
3392 | ||
e7fd4179 DT |
3393 | /* further lowcomms enhancements or alternate implementations may make |
3394 | the return value from this function useful at some point */ | |
3395 | ||
e01c4b7b AA |
3396 | static int send_message(struct dlm_mhandle *mh, struct dlm_message *ms, |
3397 | const void *name, int namelen) | |
e7fd4179 | 3398 | { |
e01c4b7b | 3399 | dlm_midcomms_commit_mhandle(mh, name, namelen); |
e7fd4179 DT |
3400 | return 0; |
3401 | } | |
3402 | ||
3403 | static void send_args(struct dlm_rsb *r, struct dlm_lkb *lkb, | |
3404 | struct dlm_message *ms) | |
3405 | { | |
00e99ccd AA |
3406 | ms->m_nodeid = cpu_to_le32(lkb->lkb_nodeid); |
3407 | ms->m_pid = cpu_to_le32(lkb->lkb_ownpid); | |
3408 | ms->m_lkid = cpu_to_le32(lkb->lkb_id); | |
3409 | ms->m_remid = cpu_to_le32(lkb->lkb_remid); | |
3410 | ms->m_exflags = cpu_to_le32(lkb->lkb_exflags); | |
1361737f | 3411 | ms->m_sbflags = cpu_to_le32(dlm_sbflags_val(lkb)); |
8a39dcd9 | 3412 | ms->m_flags = cpu_to_le32(dlm_dflags_val(lkb)); |
00e99ccd AA |
3413 | ms->m_lvbseq = cpu_to_le32(lkb->lkb_lvbseq); |
3414 | ms->m_status = cpu_to_le32(lkb->lkb_status); | |
3415 | ms->m_grmode = cpu_to_le32(lkb->lkb_grmode); | |
3416 | ms->m_rqmode = cpu_to_le32(lkb->lkb_rqmode); | |
3417 | ms->m_hash = cpu_to_le32(r->res_hash); | |
e7fd4179 DT |
3418 | |
3419 | /* m_result and m_bastmode are set from function args, | |
3420 | not from lkb fields */ | |
3421 | ||
e5dae548 | 3422 | if (lkb->lkb_bastfn) |
00e99ccd | 3423 | ms->m_asts |= cpu_to_le32(DLM_CB_BAST); |
e5dae548 | 3424 | if (lkb->lkb_astfn) |
00e99ccd | 3425 | ms->m_asts |= cpu_to_le32(DLM_CB_CAST); |
e7fd4179 | 3426 | |
da49f36f DT |
3427 | /* compare with switch in create_message; send_remove() doesn't |
3428 | use send_args() */ | |
e7fd4179 | 3429 | |
da49f36f | 3430 | switch (ms->m_type) { |
00e99ccd AA |
3431 | case cpu_to_le32(DLM_MSG_REQUEST): |
3432 | case cpu_to_le32(DLM_MSG_LOOKUP): | |
da49f36f DT |
3433 | memcpy(ms->m_extra, r->res_name, r->res_length); |
3434 | break; | |
00e99ccd AA |
3435 | case cpu_to_le32(DLM_MSG_CONVERT): |
3436 | case cpu_to_le32(DLM_MSG_UNLOCK): | |
3437 | case cpu_to_le32(DLM_MSG_REQUEST_REPLY): | |
3438 | case cpu_to_le32(DLM_MSG_CONVERT_REPLY): | |
3439 | case cpu_to_le32(DLM_MSG_GRANT): | |
7175e131 | 3440 | if (!lkb->lkb_lvbptr || !(lkb->lkb_exflags & DLM_LKF_VALBLK)) |
da49f36f | 3441 | break; |
e7fd4179 | 3442 | memcpy(ms->m_extra, lkb->lkb_lvbptr, r->res_ls->ls_lvblen); |
da49f36f DT |
3443 | break; |
3444 | } | |
e7fd4179 DT |
3445 | } |
3446 | ||
3447 | static int send_common(struct dlm_rsb *r, struct dlm_lkb *lkb, int mstype) | |
3448 | { | |
3449 | struct dlm_message *ms; | |
3450 | struct dlm_mhandle *mh; | |
3451 | int to_nodeid, error; | |
3452 | ||
c6ff669b DT |
3453 | to_nodeid = r->res_nodeid; |
3454 | ||
3455 | error = add_to_waiters(lkb, mstype, to_nodeid); | |
ef0c2bb0 DT |
3456 | if (error) |
3457 | return error; | |
e7fd4179 | 3458 | |
e1711fe3 | 3459 | error = create_message(r, lkb, to_nodeid, mstype, &ms, &mh, GFP_NOFS); |
e7fd4179 DT |
3460 | if (error) |
3461 | goto fail; | |
3462 | ||
3463 | send_args(r, lkb, ms); | |
3464 | ||
e01c4b7b | 3465 | error = send_message(mh, ms, r->res_name, r->res_length); |
e7fd4179 DT |
3466 | if (error) |
3467 | goto fail; | |
3468 | return 0; | |
3469 | ||
3470 | fail: | |
ef0c2bb0 | 3471 | remove_from_waiters(lkb, msg_reply_type(mstype)); |
e7fd4179 DT |
3472 | return error; |
3473 | } | |
3474 | ||
3475 | static int send_request(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
3476 | { | |
3477 | return send_common(r, lkb, DLM_MSG_REQUEST); | |
3478 | } | |
3479 | ||
3480 | static int send_convert(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
3481 | { | |
3482 | int error; | |
3483 | ||
3484 | error = send_common(r, lkb, DLM_MSG_CONVERT); | |
3485 | ||
3486 | /* down conversions go without a reply from the master */ | |
3487 | if (!error && down_conversion(lkb)) { | |
ef0c2bb0 | 3488 | remove_from_waiters(lkb, DLM_MSG_CONVERT_REPLY); |
a7e7ffac AA |
3489 | r->res_ls->ls_local_ms.m_type = cpu_to_le32(DLM_MSG_CONVERT_REPLY); |
3490 | r->res_ls->ls_local_ms.m_result = 0; | |
9f48eead | 3491 | __receive_convert_reply(r, lkb, &r->res_ls->ls_local_ms, true); |
e7fd4179 DT |
3492 | } |
3493 | ||
3494 | return error; | |
3495 | } | |
3496 | ||
3497 | /* FIXME: if this lkb is the only lock we hold on the rsb, then set | |
3498 | MASTER_UNCERTAIN to force the next request on the rsb to confirm | |
3499 | that the master is still correct. */ | |
3500 | ||
3501 | static int send_unlock(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
3502 | { | |
3503 | return send_common(r, lkb, DLM_MSG_UNLOCK); | |
3504 | } | |
3505 | ||
3506 | static int send_cancel(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
3507 | { | |
3508 | return send_common(r, lkb, DLM_MSG_CANCEL); | |
3509 | } | |
3510 | ||
3511 | static int send_grant(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
3512 | { | |
3513 | struct dlm_message *ms; | |
3514 | struct dlm_mhandle *mh; | |
3515 | int to_nodeid, error; | |
3516 | ||
3517 | to_nodeid = lkb->lkb_nodeid; | |
3518 | ||
e1711fe3 AA |
3519 | error = create_message(r, lkb, to_nodeid, DLM_MSG_GRANT, &ms, &mh, |
3520 | GFP_NOFS); | |
e7fd4179 DT |
3521 | if (error) |
3522 | goto out; | |
3523 | ||
3524 | send_args(r, lkb, ms); | |
3525 | ||
3526 | ms->m_result = 0; | |
3527 | ||
e01c4b7b | 3528 | error = send_message(mh, ms, r->res_name, r->res_length); |
e7fd4179 DT |
3529 | out: |
3530 | return error; | |
3531 | } | |
3532 | ||
3533 | static int send_bast(struct dlm_rsb *r, struct dlm_lkb *lkb, int mode) | |
3534 | { | |
3535 | struct dlm_message *ms; | |
3536 | struct dlm_mhandle *mh; | |
3537 | int to_nodeid, error; | |
3538 | ||
3539 | to_nodeid = lkb->lkb_nodeid; | |
3540 | ||
e1711fe3 AA |
3541 | error = create_message(r, NULL, to_nodeid, DLM_MSG_BAST, &ms, &mh, |
3542 | GFP_NOFS); | |
e7fd4179 DT |
3543 | if (error) |
3544 | goto out; | |
3545 | ||
3546 | send_args(r, lkb, ms); | |
3547 | ||
00e99ccd | 3548 | ms->m_bastmode = cpu_to_le32(mode); |
e7fd4179 | 3549 | |
e01c4b7b | 3550 | error = send_message(mh, ms, r->res_name, r->res_length); |
e7fd4179 DT |
3551 | out: |
3552 | return error; | |
3553 | } | |
3554 | ||
3555 | static int send_lookup(struct dlm_rsb *r, struct dlm_lkb *lkb) | |
3556 | { | |
3557 | struct dlm_message *ms; | |
3558 | struct dlm_mhandle *mh; | |
3559 | int to_nodeid, error; | |
3560 | ||
c6ff669b DT |
3561 | to_nodeid = dlm_dir_nodeid(r); |
3562 | ||
3563 | error = add_to_waiters(lkb, DLM_MSG_LOOKUP, to_nodeid); | |
ef0c2bb0 DT |
3564 | if (error) |
3565 | return error; | |
e7fd4179 | 3566 | |
e1711fe3 AA |
3567 | error = create_message(r, NULL, to_nodeid, DLM_MSG_LOOKUP, &ms, &mh, |
3568 | GFP_NOFS); | |
e7fd4179 DT |
3569 | if (error) |
3570 | goto fail; | |
3571 | ||
3572 | send_args(r, lkb, ms); | |
3573 | ||
e01c4b7b | 3574 | error = send_message(mh, ms, r->res_name, r->res_length); |
e7fd4179 DT |
3575 | if (error) |
3576 | goto fail; | |
3577 | return 0; | |
3578 | ||
3579 | fail: | |
ef0c2bb0 | 3580 | remove_from_waiters(lkb, DLM_MSG_LOOKUP_REPLY); |
e7fd4179 DT |
3581 | return error; |
3582 | } | |
3583 | ||
3584 | static int send_remove(struct dlm_rsb *r) | |
3585 | { | |
3586 | struct dlm_message *ms; | |
3587 | struct dlm_mhandle *mh; | |
3588 | int to_nodeid, error; | |
3589 | ||
3590 | to_nodeid = dlm_dir_nodeid(r); | |
3591 | ||
e1711fe3 | 3592 | error = create_message(r, NULL, to_nodeid, DLM_MSG_REMOVE, &ms, &mh, |
3872f87b | 3593 | GFP_ATOMIC); |
e7fd4179 DT |
3594 | if (error) |
3595 | goto out; | |
3596 | ||
3597 | memcpy(ms->m_extra, r->res_name, r->res_length); | |
00e99ccd | 3598 | ms->m_hash = cpu_to_le32(r->res_hash); |
e7fd4179 | 3599 | |
e01c4b7b | 3600 | error = send_message(mh, ms, r->res_name, r->res_length); |
e7fd4179 DT |
3601 | out: |
3602 | return error; | |
3603 | } | |
3604 | ||
3605 | static int send_common_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, | |
3606 | int mstype, int rv) | |
3607 | { | |
3608 | struct dlm_message *ms; | |
3609 | struct dlm_mhandle *mh; | |
3610 | int to_nodeid, error; | |
3611 | ||
3612 | to_nodeid = lkb->lkb_nodeid; | |
3613 | ||
e1711fe3 | 3614 | error = create_message(r, lkb, to_nodeid, mstype, &ms, &mh, GFP_NOFS); |
e7fd4179 DT |
3615 | if (error) |
3616 | goto out; | |
3617 | ||
3618 | send_args(r, lkb, ms); | |
3619 | ||
00e99ccd | 3620 | ms->m_result = cpu_to_le32(to_dlm_errno(rv)); |
e7fd4179 | 3621 | |
e01c4b7b | 3622 | error = send_message(mh, ms, r->res_name, r->res_length); |
e7fd4179 DT |
3623 | out: |
3624 | return error; | |
3625 | } | |
3626 | ||
3627 | static int send_request_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv) | |
3628 | { | |
3629 | return send_common_reply(r, lkb, DLM_MSG_REQUEST_REPLY, rv); | |
3630 | } | |
3631 | ||
3632 | static int send_convert_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv) | |
3633 | { | |
3634 | return send_common_reply(r, lkb, DLM_MSG_CONVERT_REPLY, rv); | |
3635 | } | |
3636 | ||
3637 | static int send_unlock_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv) | |
3638 | { | |
3639 | return send_common_reply(r, lkb, DLM_MSG_UNLOCK_REPLY, rv); | |
3640 | } | |
3641 | ||
3642 | static int send_cancel_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv) | |
3643 | { | |
3644 | return send_common_reply(r, lkb, DLM_MSG_CANCEL_REPLY, rv); | |
3645 | } | |
3646 | ||
3647 | static int send_lookup_reply(struct dlm_ls *ls, struct dlm_message *ms_in, | |
3648 | int ret_nodeid, int rv) | |
3649 | { | |
a7e7ffac | 3650 | struct dlm_rsb *r = &ls->ls_local_rsb; |
e7fd4179 DT |
3651 | struct dlm_message *ms; |
3652 | struct dlm_mhandle *mh; | |
3428785a | 3653 | int error, nodeid = le32_to_cpu(ms_in->m_header.h_nodeid); |
e7fd4179 | 3654 | |
e1711fe3 AA |
3655 | error = create_message(r, NULL, nodeid, DLM_MSG_LOOKUP_REPLY, &ms, &mh, |
3656 | GFP_NOFS); | |
e7fd4179 DT |
3657 | if (error) |
3658 | goto out; | |
3659 | ||
3660 | ms->m_lkid = ms_in->m_lkid; | |
00e99ccd AA |
3661 | ms->m_result = cpu_to_le32(to_dlm_errno(rv)); |
3662 | ms->m_nodeid = cpu_to_le32(ret_nodeid); | |
e7fd4179 | 3663 | |
e01c4b7b | 3664 | error = send_message(mh, ms, ms_in->m_extra, receive_extralen(ms_in)); |
e7fd4179 DT |
3665 | out: |
3666 | return error; | |
3667 | } | |
3668 | ||
3669 | /* which args we save from a received message depends heavily on the type | |
3670 | of message, unlike the send side where we can safely send everything about | |
3671 | the lkb for any type of message */ | |
3672 | ||
3673 | static void receive_flags(struct dlm_lkb *lkb, struct dlm_message *ms) | |
3674 | { | |
00e99ccd | 3675 | lkb->lkb_exflags = le32_to_cpu(ms->m_exflags); |
1361737f | 3676 | dlm_set_sbflags_val(lkb, le32_to_cpu(ms->m_sbflags)); |
8a39dcd9 | 3677 | dlm_set_dflags_val(lkb, le32_to_cpu(ms->m_flags)); |
e7fd4179 DT |
3678 | } |
3679 | ||
9f48eead AA |
3680 | static void receive_flags_reply(struct dlm_lkb *lkb, struct dlm_message *ms, |
3681 | bool local) | |
e7fd4179 | 3682 | { |
9f48eead | 3683 | if (local) |
2a7ce0ed DT |
3684 | return; |
3685 | ||
1361737f | 3686 | dlm_set_sbflags_val(lkb, le32_to_cpu(ms->m_sbflags)); |
8a39dcd9 | 3687 | dlm_set_dflags_val(lkb, le32_to_cpu(ms->m_flags)); |
e7fd4179 DT |
3688 | } |
3689 | ||
3690 | static int receive_extralen(struct dlm_message *ms) | |
3691 | { | |
3428785a AA |
3692 | return (le16_to_cpu(ms->m_header.h_length) - |
3693 | sizeof(struct dlm_message)); | |
e7fd4179 DT |
3694 | } |
3695 | ||
e7fd4179 DT |
3696 | static int receive_lvb(struct dlm_ls *ls, struct dlm_lkb *lkb, |
3697 | struct dlm_message *ms) | |
3698 | { | |
3699 | int len; | |
3700 | ||
3701 | if (lkb->lkb_exflags & DLM_LKF_VALBLK) { | |
3702 | if (!lkb->lkb_lvbptr) | |
52bda2b5 | 3703 | lkb->lkb_lvbptr = dlm_allocate_lvb(ls); |
e7fd4179 DT |
3704 | if (!lkb->lkb_lvbptr) |
3705 | return -ENOMEM; | |
3706 | len = receive_extralen(ms); | |
cfa805f6 BVA |
3707 | if (len > ls->ls_lvblen) |
3708 | len = ls->ls_lvblen; | |
e7fd4179 DT |
3709 | memcpy(lkb->lkb_lvbptr, ms->m_extra, len); |
3710 | } | |
3711 | return 0; | |
3712 | } | |
3713 | ||
e5dae548 DT |
3714 | static void fake_bastfn(void *astparam, int mode) |
3715 | { | |
3716 | log_print("fake_bastfn should not be called"); | |
3717 | } | |
3718 | ||
3719 | static void fake_astfn(void *astparam) | |
3720 | { | |
3721 | log_print("fake_astfn should not be called"); | |
3722 | } | |
3723 | ||
e7fd4179 DT |
3724 | static int receive_request_args(struct dlm_ls *ls, struct dlm_lkb *lkb, |
3725 | struct dlm_message *ms) | |
3726 | { | |
3428785a | 3727 | lkb->lkb_nodeid = le32_to_cpu(ms->m_header.h_nodeid); |
00e99ccd AA |
3728 | lkb->lkb_ownpid = le32_to_cpu(ms->m_pid); |
3729 | lkb->lkb_remid = le32_to_cpu(ms->m_lkid); | |
e7fd4179 | 3730 | lkb->lkb_grmode = DLM_LOCK_IV; |
00e99ccd | 3731 | lkb->lkb_rqmode = le32_to_cpu(ms->m_rqmode); |
e5dae548 | 3732 | |
00e99ccd AA |
3733 | lkb->lkb_bastfn = (ms->m_asts & cpu_to_le32(DLM_CB_BAST)) ? &fake_bastfn : NULL; |
3734 | lkb->lkb_astfn = (ms->m_asts & cpu_to_le32(DLM_CB_CAST)) ? &fake_astfn : NULL; | |
e7fd4179 | 3735 | |
8d07fd50 DT |
3736 | if (lkb->lkb_exflags & DLM_LKF_VALBLK) { |
3737 | /* lkb was just created so there won't be an lvb yet */ | |
52bda2b5 | 3738 | lkb->lkb_lvbptr = dlm_allocate_lvb(ls); |
8d07fd50 DT |
3739 | if (!lkb->lkb_lvbptr) |
3740 | return -ENOMEM; | |
3741 | } | |
e7fd4179 DT |
3742 | |
3743 | return 0; | |
3744 | } | |
3745 | ||
3746 | static int receive_convert_args(struct dlm_ls *ls, struct dlm_lkb *lkb, | |
3747 | struct dlm_message *ms) | |
3748 | { | |
e7fd4179 DT |
3749 | if (lkb->lkb_status != DLM_LKSTS_GRANTED) |
3750 | return -EBUSY; | |
3751 | ||
e7fd4179 DT |
3752 | if (receive_lvb(ls, lkb, ms)) |
3753 | return -ENOMEM; | |
3754 | ||
00e99ccd AA |
3755 | lkb->lkb_rqmode = le32_to_cpu(ms->m_rqmode); |
3756 | lkb->lkb_lvbseq = le32_to_cpu(ms->m_lvbseq); | |
e7fd4179 DT |
3757 | |
3758 | return 0; | |
3759 | } | |
3760 | ||
3761 | static int receive_unlock_args(struct dlm_ls *ls, struct dlm_lkb *lkb, | |
3762 | struct dlm_message *ms) | |
3763 | { | |
e7fd4179 DT |
3764 | if (receive_lvb(ls, lkb, ms)) |
3765 | return -ENOMEM; | |
3766 | return 0; | |
3767 | } | |
3768 | ||
a7e7ffac | 3769 | /* We fill in the local-lkb fields with the info that send_xxxx_reply() |
e7fd4179 DT |
3770 | uses to send a reply and that the remote end uses to process the reply. */ |
3771 | ||
a7e7ffac | 3772 | static void setup_local_lkb(struct dlm_ls *ls, struct dlm_message *ms) |
e7fd4179 | 3773 | { |
a7e7ffac | 3774 | struct dlm_lkb *lkb = &ls->ls_local_lkb; |
3428785a | 3775 | lkb->lkb_nodeid = le32_to_cpu(ms->m_header.h_nodeid); |
00e99ccd | 3776 | lkb->lkb_remid = le32_to_cpu(ms->m_lkid); |
e7fd4179 DT |
3777 | } |
3778 | ||
c54e04b0 DT |
3779 | /* This is called after the rsb is locked so that we can safely inspect |
3780 | fields in the lkb. */ | |
3781 | ||
3782 | static int validate_message(struct dlm_lkb *lkb, struct dlm_message *ms) | |
3783 | { | |
3428785a | 3784 | int from = le32_to_cpu(ms->m_header.h_nodeid); |
c54e04b0 DT |
3785 | int error = 0; |
3786 | ||
6c2e3bf6 | 3787 | /* currently mixing of user/kernel locks are not supported */ |
8a39dcd9 AA |
3788 | if (ms->m_flags & cpu_to_le32(BIT(DLM_DFL_USER_BIT)) && |
3789 | !test_bit(DLM_DFL_USER_BIT, &lkb->lkb_dflags)) { | |
6c2e3bf6 AA |
3790 | log_error(lkb->lkb_resource->res_ls, |
3791 | "got user dlm message for a kernel lock"); | |
3792 | error = -EINVAL; | |
3793 | goto out; | |
3794 | } | |
3795 | ||
c54e04b0 | 3796 | switch (ms->m_type) { |
00e99ccd AA |
3797 | case cpu_to_le32(DLM_MSG_CONVERT): |
3798 | case cpu_to_le32(DLM_MSG_UNLOCK): | |
3799 | case cpu_to_le32(DLM_MSG_CANCEL): | |
c54e04b0 DT |
3800 | if (!is_master_copy(lkb) || lkb->lkb_nodeid != from) |
3801 | error = -EINVAL; | |
3802 | break; | |
3803 | ||
00e99ccd AA |
3804 | case cpu_to_le32(DLM_MSG_CONVERT_REPLY): |
3805 | case cpu_to_le32(DLM_MSG_UNLOCK_REPLY): | |
3806 | case cpu_to_le32(DLM_MSG_CANCEL_REPLY): | |
3807 | case cpu_to_le32(DLM_MSG_GRANT): | |
3808 | case cpu_to_le32(DLM_MSG_BAST): | |
c54e04b0 DT |
3809 | if (!is_process_copy(lkb) || lkb->lkb_nodeid != from) |
3810 | error = -EINVAL; | |
3811 | break; | |
3812 | ||
00e99ccd | 3813 | case cpu_to_le32(DLM_MSG_REQUEST_REPLY): |
c54e04b0 DT |
3814 | if (!is_process_copy(lkb)) |
3815 | error = -EINVAL; | |
3816 | else if (lkb->lkb_nodeid != -1 && lkb->lkb_nodeid != from) | |
3817 | error = -EINVAL; | |
3818 | break; | |
3819 | ||
3820 | default: | |
3821 | error = -EINVAL; | |
3822 | } | |
3823 | ||
6c2e3bf6 | 3824 | out: |
c54e04b0 DT |
3825 | if (error) |
3826 | log_error(lkb->lkb_resource->res_ls, | |
3827 | "ignore invalid message %d from %d %x %x %x %d", | |
00e99ccd | 3828 | le32_to_cpu(ms->m_type), from, lkb->lkb_id, |
e1af8728 AA |
3829 | lkb->lkb_remid, dlm_iflags_val(lkb), |
3830 | lkb->lkb_nodeid); | |
c54e04b0 DT |
3831 | return error; |
3832 | } | |
3833 | ||
6d40c4a7 | 3834 | static int receive_request(struct dlm_ls *ls, struct dlm_message *ms) |
e7fd4179 DT |
3835 | { |
3836 | struct dlm_lkb *lkb; | |
3837 | struct dlm_rsb *r; | |
c04fecb4 | 3838 | int from_nodeid; |
96006ea6 | 3839 | int error, namelen = 0; |
e7fd4179 | 3840 | |
3428785a | 3841 | from_nodeid = le32_to_cpu(ms->m_header.h_nodeid); |
c04fecb4 | 3842 | |
e7fd4179 DT |
3843 | error = create_lkb(ls, &lkb); |
3844 | if (error) | |
3845 | goto fail; | |
3846 | ||
3847 | receive_flags(lkb, ms); | |
e1af8728 | 3848 | set_bit(DLM_IFL_MSTCPY_BIT, &lkb->lkb_iflags); |
e7fd4179 DT |
3849 | error = receive_request_args(ls, lkb, ms); |
3850 | if (error) { | |
b3f58d8f | 3851 | __put_lkb(ls, lkb); |
e7fd4179 DT |
3852 | goto fail; |
3853 | } | |
3854 | ||
c04fecb4 DT |
3855 | /* The dir node is the authority on whether we are the master |
3856 | for this rsb or not, so if the master sends us a request, we should | |
3857 | recreate the rsb if we've destroyed it. This race happens when we | |
3858 | send a remove message to the dir node at the same time that the dir | |
3859 | node sends us a request for the rsb. */ | |
3860 | ||
e7fd4179 DT |
3861 | namelen = receive_extralen(ms); |
3862 | ||
c04fecb4 DT |
3863 | error = find_rsb(ls, ms->m_extra, namelen, from_nodeid, |
3864 | R_RECEIVE_REQUEST, &r); | |
e7fd4179 | 3865 | if (error) { |
b3f58d8f | 3866 | __put_lkb(ls, lkb); |
e7fd4179 DT |
3867 | goto fail; |
3868 | } | |
3869 | ||
3870 | lock_rsb(r); | |
3871 | ||
c04fecb4 DT |
3872 | if (r->res_master_nodeid != dlm_our_nodeid()) { |
3873 | error = validate_master_nodeid(ls, r, from_nodeid); | |
3874 | if (error) { | |
3875 | unlock_rsb(r); | |
3876 | put_rsb(r); | |
3877 | __put_lkb(ls, lkb); | |
3878 | goto fail; | |
3879 | } | |
3880 | } | |
3881 | ||
e7fd4179 DT |
3882 | attach_lkb(r, lkb); |
3883 | error = do_request(r, lkb); | |
3884 | send_request_reply(r, lkb, error); | |
cf6620ac | 3885 | do_request_effects(r, lkb, error); |
e7fd4179 DT |
3886 | |
3887 | unlock_rsb(r); | |
3888 | put_rsb(r); | |
3889 | ||
3890 | if (error == -EINPROGRESS) | |
3891 | error = 0; | |
3892 | if (error) | |
b3f58d8f | 3893 | dlm_put_lkb(lkb); |
6d40c4a7 | 3894 | return 0; |
e7fd4179 DT |
3895 | |
3896 | fail: | |
c04fecb4 DT |
3897 | /* TODO: instead of returning ENOTBLK, add the lkb to res_lookup |
3898 | and do this receive_request again from process_lookup_list once | |
3899 | we get the lookup reply. This would avoid a many repeated | |
3900 | ENOTBLK request failures when the lookup reply designating us | |
3901 | as master is delayed. */ | |
3902 | ||
c04fecb4 DT |
3903 | if (error != -ENOTBLK) { |
3904 | log_limit(ls, "receive_request %x from %d %d", | |
00e99ccd | 3905 | le32_to_cpu(ms->m_lkid), from_nodeid, error); |
c04fecb4 DT |
3906 | } |
3907 | ||
a7e7ffac AA |
3908 | setup_local_lkb(ls, ms); |
3909 | send_request_reply(&ls->ls_local_rsb, &ls->ls_local_lkb, error); | |
6d40c4a7 | 3910 | return error; |
e7fd4179 DT |
3911 | } |
3912 | ||
6d40c4a7 | 3913 | static int receive_convert(struct dlm_ls *ls, struct dlm_message *ms) |
e7fd4179 DT |
3914 | { |
3915 | struct dlm_lkb *lkb; | |
3916 | struct dlm_rsb *r; | |
90135925 | 3917 | int error, reply = 1; |
e7fd4179 | 3918 | |
00e99ccd | 3919 | error = find_lkb(ls, le32_to_cpu(ms->m_remid), &lkb); |
e7fd4179 DT |
3920 | if (error) |
3921 | goto fail; | |
3922 | ||
00e99ccd | 3923 | if (lkb->lkb_remid != le32_to_cpu(ms->m_lkid)) { |
4875647a DT |
3924 | log_error(ls, "receive_convert %x remid %x recover_seq %llu " |
3925 | "remote %d %x", lkb->lkb_id, lkb->lkb_remid, | |
3926 | (unsigned long long)lkb->lkb_recover_seq, | |
00e99ccd AA |
3927 | le32_to_cpu(ms->m_header.h_nodeid), |
3928 | le32_to_cpu(ms->m_lkid)); | |
6d40c4a7 | 3929 | error = -ENOENT; |
c0174726 | 3930 | dlm_put_lkb(lkb); |
6d40c4a7 DT |
3931 | goto fail; |
3932 | } | |
3933 | ||
e7fd4179 DT |
3934 | r = lkb->lkb_resource; |
3935 | ||
3936 | hold_rsb(r); | |
3937 | lock_rsb(r); | |
3938 | ||
c54e04b0 DT |
3939 | error = validate_message(lkb, ms); |
3940 | if (error) | |
3941 | goto out; | |
3942 | ||
e7fd4179 | 3943 | receive_flags(lkb, ms); |
cf6620ac | 3944 | |
e7fd4179 | 3945 | error = receive_convert_args(ls, lkb, ms); |
cf6620ac DT |
3946 | if (error) { |
3947 | send_convert_reply(r, lkb, error); | |
3948 | goto out; | |
3949 | } | |
3950 | ||
e7fd4179 DT |
3951 | reply = !down_conversion(lkb); |
3952 | ||
3953 | error = do_convert(r, lkb); | |
e7fd4179 DT |
3954 | if (reply) |
3955 | send_convert_reply(r, lkb, error); | |
cf6620ac | 3956 | do_convert_effects(r, lkb, error); |
c54e04b0 | 3957 | out: |
e7fd4179 DT |
3958 | unlock_rsb(r); |
3959 | put_rsb(r); | |
b3f58d8f | 3960 | dlm_put_lkb(lkb); |
6d40c4a7 | 3961 | return 0; |
e7fd4179 DT |
3962 | |
3963 | fail: | |
a7e7ffac AA |
3964 | setup_local_lkb(ls, ms); |
3965 | send_convert_reply(&ls->ls_local_rsb, &ls->ls_local_lkb, error); | |
6d40c4a7 | 3966 | return error; |
e7fd4179 DT |
3967 | } |
3968 | ||
6d40c4a7 | 3969 | static int receive_unlock(struct dlm_ls *ls, struct dlm_message *ms) |
e7fd4179 DT |
3970 | { |
3971 | struct dlm_lkb *lkb; | |
3972 | struct dlm_rsb *r; | |
3973 | int error; | |
3974 | ||
00e99ccd | 3975 | error = find_lkb(ls, le32_to_cpu(ms->m_remid), &lkb); |
e7fd4179 DT |
3976 | if (error) |
3977 | goto fail; | |
3978 | ||
00e99ccd | 3979 | if (lkb->lkb_remid != le32_to_cpu(ms->m_lkid)) { |
6d40c4a7 DT |
3980 | log_error(ls, "receive_unlock %x remid %x remote %d %x", |
3981 | lkb->lkb_id, lkb->lkb_remid, | |
00e99ccd AA |
3982 | le32_to_cpu(ms->m_header.h_nodeid), |
3983 | le32_to_cpu(ms->m_lkid)); | |
6d40c4a7 | 3984 | error = -ENOENT; |
c0174726 | 3985 | dlm_put_lkb(lkb); |
6d40c4a7 DT |
3986 | goto fail; |
3987 | } | |
3988 | ||
e7fd4179 DT |
3989 | r = lkb->lkb_resource; |
3990 | ||
3991 | hold_rsb(r); | |
3992 | lock_rsb(r); | |
3993 | ||
c54e04b0 DT |
3994 | error = validate_message(lkb, ms); |
3995 | if (error) | |
3996 | goto out; | |
3997 | ||
e7fd4179 | 3998 | receive_flags(lkb, ms); |
cf6620ac | 3999 | |
e7fd4179 | 4000 | error = receive_unlock_args(ls, lkb, ms); |
cf6620ac DT |
4001 | if (error) { |
4002 | send_unlock_reply(r, lkb, error); | |
4003 | goto out; | |
4004 | } | |
e7fd4179 DT |
4005 | |
4006 | error = do_unlock(r, lkb); | |
e7fd4179 | 4007 | send_unlock_reply(r, lkb, error); |
cf6620ac | 4008 | do_unlock_effects(r, lkb, error); |
c54e04b0 | 4009 | out: |
e7fd4179 DT |
4010 | unlock_rsb(r); |
4011 | put_rsb(r); | |
b3f58d8f | 4012 | dlm_put_lkb(lkb); |
6d40c4a7 | 4013 | return 0; |
e7fd4179 DT |
4014 | |
4015 | fail: | |
a7e7ffac AA |
4016 | setup_local_lkb(ls, ms); |
4017 | send_unlock_reply(&ls->ls_local_rsb, &ls->ls_local_lkb, error); | |
6d40c4a7 | 4018 | return error; |
e7fd4179 DT |
4019 | } |
4020 | ||
6d40c4a7 | 4021 | static int receive_cancel(struct dlm_ls *ls, struct dlm_message *ms) |
e7fd4179 DT |
4022 | { |
4023 | struct dlm_lkb *lkb; | |
4024 | struct dlm_rsb *r; | |
4025 | int error; | |
4026 | ||
00e99ccd | 4027 | error = find_lkb(ls, le32_to_cpu(ms->m_remid), &lkb); |
e7fd4179 DT |
4028 | if (error) |
4029 | goto fail; | |
4030 | ||
4031 | receive_flags(lkb, ms); | |
4032 | ||
4033 | r = lkb->lkb_resource; | |
4034 | ||
4035 | hold_rsb(r); | |
4036 | lock_rsb(r); | |
4037 | ||
c54e04b0 DT |
4038 | error = validate_message(lkb, ms); |
4039 | if (error) | |
4040 | goto out; | |
4041 | ||
e7fd4179 DT |
4042 | error = do_cancel(r, lkb); |
4043 | send_cancel_reply(r, lkb, error); | |
cf6620ac | 4044 | do_cancel_effects(r, lkb, error); |
c54e04b0 | 4045 | out: |
e7fd4179 DT |
4046 | unlock_rsb(r); |
4047 | put_rsb(r); | |
b3f58d8f | 4048 | dlm_put_lkb(lkb); |
6d40c4a7 | 4049 | return 0; |
e7fd4179 DT |
4050 | |
4051 | fail: | |
a7e7ffac AA |
4052 | setup_local_lkb(ls, ms); |
4053 | send_cancel_reply(&ls->ls_local_rsb, &ls->ls_local_lkb, error); | |
6d40c4a7 | 4054 | return error; |
e7fd4179 DT |
4055 | } |
4056 | ||
6d40c4a7 | 4057 | static int receive_grant(struct dlm_ls *ls, struct dlm_message *ms) |
e7fd4179 DT |
4058 | { |
4059 | struct dlm_lkb *lkb; | |
4060 | struct dlm_rsb *r; | |
4061 | int error; | |
4062 | ||
00e99ccd | 4063 | error = find_lkb(ls, le32_to_cpu(ms->m_remid), &lkb); |
6d40c4a7 DT |
4064 | if (error) |
4065 | return error; | |
e7fd4179 DT |
4066 | |
4067 | r = lkb->lkb_resource; | |
4068 | ||
4069 | hold_rsb(r); | |
4070 | lock_rsb(r); | |
4071 | ||
c54e04b0 DT |
4072 | error = validate_message(lkb, ms); |
4073 | if (error) | |
4074 | goto out; | |
4075 | ||
9f48eead | 4076 | receive_flags_reply(lkb, ms, false); |
7d3c1feb DT |
4077 | if (is_altmode(lkb)) |
4078 | munge_altmode(lkb, ms); | |
e7fd4179 DT |
4079 | grant_lock_pc(r, lkb, ms); |
4080 | queue_cast(r, lkb, 0); | |
c54e04b0 | 4081 | out: |
e7fd4179 DT |
4082 | unlock_rsb(r); |
4083 | put_rsb(r); | |
b3f58d8f | 4084 | dlm_put_lkb(lkb); |
6d40c4a7 | 4085 | return 0; |
e7fd4179 DT |
4086 | } |
4087 | ||
6d40c4a7 | 4088 | static int receive_bast(struct dlm_ls *ls, struct dlm_message *ms) |
e7fd4179 DT |
4089 | { |
4090 | struct dlm_lkb *lkb; | |
4091 | struct dlm_rsb *r; | |
4092 | int error; | |
4093 | ||
00e99ccd | 4094 | error = find_lkb(ls, le32_to_cpu(ms->m_remid), &lkb); |
6d40c4a7 DT |
4095 | if (error) |
4096 | return error; | |
e7fd4179 DT |
4097 | |
4098 | r = lkb->lkb_resource; | |
4099 | ||
4100 | hold_rsb(r); | |
4101 | lock_rsb(r); | |
4102 | ||
c54e04b0 DT |
4103 | error = validate_message(lkb, ms); |
4104 | if (error) | |
4105 | goto out; | |
e7fd4179 | 4106 | |
00e99ccd AA |
4107 | queue_bast(r, lkb, le32_to_cpu(ms->m_bastmode)); |
4108 | lkb->lkb_highbast = le32_to_cpu(ms->m_bastmode); | |
c54e04b0 | 4109 | out: |
e7fd4179 DT |
4110 | unlock_rsb(r); |
4111 | put_rsb(r); | |
b3f58d8f | 4112 | dlm_put_lkb(lkb); |
6d40c4a7 | 4113 | return 0; |
e7fd4179 DT |
4114 | } |
4115 | ||
4116 | static void receive_lookup(struct dlm_ls *ls, struct dlm_message *ms) | |
4117 | { | |
c04fecb4 | 4118 | int len, error, ret_nodeid, from_nodeid, our_nodeid; |
e7fd4179 | 4119 | |
3428785a | 4120 | from_nodeid = le32_to_cpu(ms->m_header.h_nodeid); |
e7fd4179 DT |
4121 | our_nodeid = dlm_our_nodeid(); |
4122 | ||
4123 | len = receive_extralen(ms); | |
4124 | ||
c04fecb4 DT |
4125 | error = dlm_master_lookup(ls, from_nodeid, ms->m_extra, len, 0, |
4126 | &ret_nodeid, NULL); | |
e7fd4179 DT |
4127 | |
4128 | /* Optimization: we're master so treat lookup as a request */ | |
4129 | if (!error && ret_nodeid == our_nodeid) { | |
4130 | receive_request(ls, ms); | |
4131 | return; | |
4132 | } | |
e7fd4179 DT |
4133 | send_lookup_reply(ls, ms, ret_nodeid, error); |
4134 | } | |
4135 | ||
4136 | static void receive_remove(struct dlm_ls *ls, struct dlm_message *ms) | |
4137 | { | |
c04fecb4 DT |
4138 | char name[DLM_RESNAME_MAXLEN+1]; |
4139 | struct dlm_rsb *r; | |
4140 | uint32_t hash, b; | |
4141 | int rv, len, dir_nodeid, from_nodeid; | |
e7fd4179 | 4142 | |
3428785a | 4143 | from_nodeid = le32_to_cpu(ms->m_header.h_nodeid); |
e7fd4179 DT |
4144 | |
4145 | len = receive_extralen(ms); | |
4146 | ||
c04fecb4 DT |
4147 | if (len > DLM_RESNAME_MAXLEN) { |
4148 | log_error(ls, "receive_remove from %d bad len %d", | |
4149 | from_nodeid, len); | |
4150 | return; | |
4151 | } | |
4152 | ||
00e99ccd | 4153 | dir_nodeid = dlm_hash2nodeid(ls, le32_to_cpu(ms->m_hash)); |
e7fd4179 | 4154 | if (dir_nodeid != dlm_our_nodeid()) { |
c04fecb4 DT |
4155 | log_error(ls, "receive_remove from %d bad nodeid %d", |
4156 | from_nodeid, dir_nodeid); | |
e7fd4179 DT |
4157 | return; |
4158 | } | |
4159 | ||
c04fecb4 DT |
4160 | /* Look for name on rsbtbl.toss, if it's there, kill it. |
4161 | If it's on rsbtbl.keep, it's being used, and we should ignore this | |
4162 | message. This is an expected race between the dir node sending a | |
4163 | request to the master node at the same time as the master node sends | |
4164 | a remove to the dir node. The resolution to that race is for the | |
4165 | dir node to ignore the remove message, and the master node to | |
4166 | recreate the master rsb when it gets a request from the dir node for | |
4167 | an rsb it doesn't have. */ | |
4168 | ||
4169 | memset(name, 0, sizeof(name)); | |
4170 | memcpy(name, ms->m_extra, len); | |
4171 | ||
4172 | hash = jhash(name, len, 0); | |
4173 | b = hash & (ls->ls_rsbtbl_size - 1); | |
4174 | ||
4175 | spin_lock(&ls->ls_rsbtbl[b].lock); | |
4176 | ||
4177 | rv = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].toss, name, len, &r); | |
4178 | if (rv) { | |
4179 | /* verify the rsb is on keep list per comment above */ | |
4180 | rv = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].keep, name, len, &r); | |
4181 | if (rv) { | |
4182 | /* should not happen */ | |
4183 | log_error(ls, "receive_remove from %d not found %s", | |
4184 | from_nodeid, name); | |
4185 | spin_unlock(&ls->ls_rsbtbl[b].lock); | |
4186 | return; | |
4187 | } | |
4188 | if (r->res_master_nodeid != from_nodeid) { | |
4189 | /* should not happen */ | |
4190 | log_error(ls, "receive_remove keep from %d master %d", | |
4191 | from_nodeid, r->res_master_nodeid); | |
4192 | dlm_print_rsb(r); | |
4193 | spin_unlock(&ls->ls_rsbtbl[b].lock); | |
4194 | return; | |
4195 | } | |
4196 | ||
4197 | log_debug(ls, "receive_remove from %d master %d first %x %s", | |
4198 | from_nodeid, r->res_master_nodeid, r->res_first_lkid, | |
4199 | name); | |
4200 | spin_unlock(&ls->ls_rsbtbl[b].lock); | |
4201 | return; | |
4202 | } | |
4203 | ||
4204 | if (r->res_master_nodeid != from_nodeid) { | |
4205 | log_error(ls, "receive_remove toss from %d master %d", | |
4206 | from_nodeid, r->res_master_nodeid); | |
4207 | dlm_print_rsb(r); | |
4208 | spin_unlock(&ls->ls_rsbtbl[b].lock); | |
4209 | return; | |
4210 | } | |
4211 | ||
4212 | if (kref_put(&r->res_ref, kill_rsb)) { | |
4213 | rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[b].toss); | |
4214 | spin_unlock(&ls->ls_rsbtbl[b].lock); | |
4215 | dlm_free_rsb(r); | |
4216 | } else { | |
4217 | log_error(ls, "receive_remove from %d rsb ref error", | |
4218 | from_nodeid); | |
4219 | dlm_print_rsb(r); | |
4220 | spin_unlock(&ls->ls_rsbtbl[b].lock); | |
4221 | } | |
e7fd4179 DT |
4222 | } |
4223 | ||
8499137d DT |
4224 | static void receive_purge(struct dlm_ls *ls, struct dlm_message *ms) |
4225 | { | |
00e99ccd | 4226 | do_purge(ls, le32_to_cpu(ms->m_nodeid), le32_to_cpu(ms->m_pid)); |
8499137d DT |
4227 | } |
4228 | ||
6d40c4a7 | 4229 | static int receive_request_reply(struct dlm_ls *ls, struct dlm_message *ms) |
e7fd4179 DT |
4230 | { |
4231 | struct dlm_lkb *lkb; | |
4232 | struct dlm_rsb *r; | |
ef0c2bb0 | 4233 | int error, mstype, result; |
3428785a | 4234 | int from_nodeid = le32_to_cpu(ms->m_header.h_nodeid); |
e7fd4179 | 4235 | |
00e99ccd | 4236 | error = find_lkb(ls, le32_to_cpu(ms->m_remid), &lkb); |
6d40c4a7 DT |
4237 | if (error) |
4238 | return error; | |
e7fd4179 | 4239 | |
e7fd4179 DT |
4240 | r = lkb->lkb_resource; |
4241 | hold_rsb(r); | |
4242 | lock_rsb(r); | |
4243 | ||
c54e04b0 DT |
4244 | error = validate_message(lkb, ms); |
4245 | if (error) | |
4246 | goto out; | |
4247 | ||
ef0c2bb0 DT |
4248 | mstype = lkb->lkb_wait_type; |
4249 | error = remove_from_waiters(lkb, DLM_MSG_REQUEST_REPLY); | |
4875647a DT |
4250 | if (error) { |
4251 | log_error(ls, "receive_request_reply %x remote %d %x result %d", | |
00e99ccd AA |
4252 | lkb->lkb_id, from_nodeid, le32_to_cpu(ms->m_lkid), |
4253 | from_dlm_errno(le32_to_cpu(ms->m_result))); | |
4875647a | 4254 | dlm_dump_rsb(r); |
ef0c2bb0 | 4255 | goto out; |
4875647a | 4256 | } |
ef0c2bb0 | 4257 | |
e7fd4179 DT |
4258 | /* Optimization: the dir node was also the master, so it took our |
4259 | lookup as a request and sent request reply instead of lookup reply */ | |
4260 | if (mstype == DLM_MSG_LOOKUP) { | |
c04fecb4 DT |
4261 | r->res_master_nodeid = from_nodeid; |
4262 | r->res_nodeid = from_nodeid; | |
4263 | lkb->lkb_nodeid = from_nodeid; | |
e7fd4179 DT |
4264 | } |
4265 | ||
ef0c2bb0 | 4266 | /* this is the value returned from do_request() on the master */ |
00e99ccd | 4267 | result = from_dlm_errno(le32_to_cpu(ms->m_result)); |
ef0c2bb0 DT |
4268 | |
4269 | switch (result) { | |
e7fd4179 | 4270 | case -EAGAIN: |
ef0c2bb0 | 4271 | /* request would block (be queued) on remote master */ |
e7fd4179 DT |
4272 | queue_cast(r, lkb, -EAGAIN); |
4273 | confirm_master(r, -EAGAIN); | |
ef0c2bb0 | 4274 | unhold_lkb(lkb); /* undoes create_lkb() */ |
e7fd4179 DT |
4275 | break; |
4276 | ||
4277 | case -EINPROGRESS: | |
4278 | case 0: | |
4279 | /* request was queued or granted on remote master */ | |
9f48eead | 4280 | receive_flags_reply(lkb, ms, false); |
00e99ccd | 4281 | lkb->lkb_remid = le32_to_cpu(ms->m_lkid); |
7d3c1feb DT |
4282 | if (is_altmode(lkb)) |
4283 | munge_altmode(lkb, ms); | |
3ae1acf9 | 4284 | if (result) { |
e7fd4179 | 4285 | add_lkb(r, lkb, DLM_LKSTS_WAITING); |
3ae1acf9 | 4286 | } else { |
e7fd4179 DT |
4287 | grant_lock_pc(r, lkb, ms); |
4288 | queue_cast(r, lkb, 0); | |
4289 | } | |
ef0c2bb0 | 4290 | confirm_master(r, result); |
e7fd4179 DT |
4291 | break; |
4292 | ||
597d0cae | 4293 | case -EBADR: |
e7fd4179 DT |
4294 | case -ENOTBLK: |
4295 | /* find_rsb failed to find rsb or rsb wasn't master */ | |
c04fecb4 DT |
4296 | log_limit(ls, "receive_request_reply %x from %d %d " |
4297 | "master %d dir %d first %x %s", lkb->lkb_id, | |
4298 | from_nodeid, result, r->res_master_nodeid, | |
4299 | r->res_dir_nodeid, r->res_first_lkid, r->res_name); | |
4300 | ||
4301 | if (r->res_dir_nodeid != dlm_our_nodeid() && | |
4302 | r->res_master_nodeid != dlm_our_nodeid()) { | |
4303 | /* cause _request_lock->set_master->send_lookup */ | |
4304 | r->res_master_nodeid = 0; | |
4305 | r->res_nodeid = -1; | |
4306 | lkb->lkb_nodeid = -1; | |
4307 | } | |
ef0c2bb0 DT |
4308 | |
4309 | if (is_overlap(lkb)) { | |
4310 | /* we'll ignore error in cancel/unlock reply */ | |
4311 | queue_cast_overlap(r, lkb); | |
aec64e1b | 4312 | confirm_master(r, result); |
ef0c2bb0 | 4313 | unhold_lkb(lkb); /* undoes create_lkb() */ |
c04fecb4 | 4314 | } else { |
ef0c2bb0 | 4315 | _request_lock(r, lkb); |
c04fecb4 DT |
4316 | |
4317 | if (r->res_master_nodeid == dlm_our_nodeid()) | |
4318 | confirm_master(r, 0); | |
4319 | } | |
e7fd4179 DT |
4320 | break; |
4321 | ||
4322 | default: | |
ef0c2bb0 DT |
4323 | log_error(ls, "receive_request_reply %x error %d", |
4324 | lkb->lkb_id, result); | |
e7fd4179 DT |
4325 | } |
4326 | ||
e1af8728 AA |
4327 | if ((result == 0 || result == -EINPROGRESS) && |
4328 | test_and_clear_bit(DLM_IFL_OVERLAP_UNLOCK_BIT, &lkb->lkb_iflags)) { | |
ef0c2bb0 DT |
4329 | log_debug(ls, "receive_request_reply %x result %d unlock", |
4330 | lkb->lkb_id, result); | |
e1af8728 | 4331 | clear_bit(DLM_IFL_OVERLAP_CANCEL_BIT, &lkb->lkb_iflags); |
ef0c2bb0 | 4332 | send_unlock(r, lkb); |
e1af8728 AA |
4333 | } else if ((result == -EINPROGRESS) && |
4334 | test_and_clear_bit(DLM_IFL_OVERLAP_CANCEL_BIT, | |
4335 | &lkb->lkb_iflags)) { | |
ef0c2bb0 | 4336 | log_debug(ls, "receive_request_reply %x cancel", lkb->lkb_id); |
e1af8728 | 4337 | clear_bit(DLM_IFL_OVERLAP_UNLOCK_BIT, &lkb->lkb_iflags); |
ef0c2bb0 DT |
4338 | send_cancel(r, lkb); |
4339 | } else { | |
e1af8728 AA |
4340 | clear_bit(DLM_IFL_OVERLAP_CANCEL_BIT, &lkb->lkb_iflags); |
4341 | clear_bit(DLM_IFL_OVERLAP_UNLOCK_BIT, &lkb->lkb_iflags); | |
ef0c2bb0 DT |
4342 | } |
4343 | out: | |
e7fd4179 DT |
4344 | unlock_rsb(r); |
4345 | put_rsb(r); | |
b3f58d8f | 4346 | dlm_put_lkb(lkb); |
6d40c4a7 | 4347 | return 0; |
e7fd4179 DT |
4348 | } |
4349 | ||
4350 | static void __receive_convert_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, | |
9f48eead | 4351 | struct dlm_message *ms, bool local) |
e7fd4179 | 4352 | { |
e7fd4179 | 4353 | /* this is the value returned from do_convert() on the master */ |
00e99ccd | 4354 | switch (from_dlm_errno(le32_to_cpu(ms->m_result))) { |
e7fd4179 DT |
4355 | case -EAGAIN: |
4356 | /* convert would block (be queued) on remote master */ | |
4357 | queue_cast(r, lkb, -EAGAIN); | |
4358 | break; | |
4359 | ||
c85d65e9 | 4360 | case -EDEADLK: |
9f48eead | 4361 | receive_flags_reply(lkb, ms, local); |
c85d65e9 DT |
4362 | revert_lock_pc(r, lkb); |
4363 | queue_cast(r, lkb, -EDEADLK); | |
4364 | break; | |
4365 | ||
e7fd4179 DT |
4366 | case -EINPROGRESS: |
4367 | /* convert was queued on remote master */ | |
9f48eead | 4368 | receive_flags_reply(lkb, ms, local); |
7d3c1feb | 4369 | if (is_demoted(lkb)) |
2a7ce0ed | 4370 | munge_demoted(lkb); |
e7fd4179 DT |
4371 | del_lkb(r, lkb); |
4372 | add_lkb(r, lkb, DLM_LKSTS_CONVERT); | |
4373 | break; | |
4374 | ||
4375 | case 0: | |
4376 | /* convert was granted on remote master */ | |
9f48eead | 4377 | receive_flags_reply(lkb, ms, local); |
7d3c1feb | 4378 | if (is_demoted(lkb)) |
2a7ce0ed | 4379 | munge_demoted(lkb); |
e7fd4179 DT |
4380 | grant_lock_pc(r, lkb, ms); |
4381 | queue_cast(r, lkb, 0); | |
4382 | break; | |
4383 | ||
4384 | default: | |
6d40c4a7 | 4385 | log_error(r->res_ls, "receive_convert_reply %x remote %d %x %d", |
3428785a | 4386 | lkb->lkb_id, le32_to_cpu(ms->m_header.h_nodeid), |
00e99ccd AA |
4387 | le32_to_cpu(ms->m_lkid), |
4388 | from_dlm_errno(le32_to_cpu(ms->m_result))); | |
6d40c4a7 DT |
4389 | dlm_print_rsb(r); |
4390 | dlm_print_lkb(lkb); | |
e7fd4179 DT |
4391 | } |
4392 | } | |
4393 | ||
9f48eead AA |
4394 | static void _receive_convert_reply(struct dlm_lkb *lkb, struct dlm_message *ms, |
4395 | bool local) | |
e7fd4179 DT |
4396 | { |
4397 | struct dlm_rsb *r = lkb->lkb_resource; | |
ef0c2bb0 | 4398 | int error; |
e7fd4179 DT |
4399 | |
4400 | hold_rsb(r); | |
4401 | lock_rsb(r); | |
4402 | ||
c54e04b0 DT |
4403 | error = validate_message(lkb, ms); |
4404 | if (error) | |
4405 | goto out; | |
4406 | ||
a7e7ffac | 4407 | /* local reply can happen with waiters_mutex held */ |
9f48eead | 4408 | error = remove_from_waiters_ms(lkb, ms, local); |
ef0c2bb0 DT |
4409 | if (error) |
4410 | goto out; | |
e7fd4179 | 4411 | |
9f48eead | 4412 | __receive_convert_reply(r, lkb, ms, local); |
ef0c2bb0 | 4413 | out: |
e7fd4179 DT |
4414 | unlock_rsb(r); |
4415 | put_rsb(r); | |
4416 | } | |
4417 | ||
6d40c4a7 | 4418 | static int receive_convert_reply(struct dlm_ls *ls, struct dlm_message *ms) |
e7fd4179 DT |
4419 | { |
4420 | struct dlm_lkb *lkb; | |
4421 | int error; | |
4422 | ||
00e99ccd | 4423 | error = find_lkb(ls, le32_to_cpu(ms->m_remid), &lkb); |
6d40c4a7 DT |
4424 | if (error) |
4425 | return error; | |
e7fd4179 | 4426 | |
9f48eead | 4427 | _receive_convert_reply(lkb, ms, false); |
b3f58d8f | 4428 | dlm_put_lkb(lkb); |
6d40c4a7 | 4429 | return 0; |
e7fd4179 DT |
4430 | } |
4431 | ||
9f48eead AA |
4432 | static void _receive_unlock_reply(struct dlm_lkb *lkb, struct dlm_message *ms, |
4433 | bool local) | |
e7fd4179 DT |
4434 | { |
4435 | struct dlm_rsb *r = lkb->lkb_resource; | |
ef0c2bb0 | 4436 | int error; |
e7fd4179 DT |
4437 | |
4438 | hold_rsb(r); | |
4439 | lock_rsb(r); | |
4440 | ||
c54e04b0 DT |
4441 | error = validate_message(lkb, ms); |
4442 | if (error) | |
4443 | goto out; | |
4444 | ||
a7e7ffac | 4445 | /* local reply can happen with waiters_mutex held */ |
9f48eead | 4446 | error = remove_from_waiters_ms(lkb, ms, local); |
ef0c2bb0 DT |
4447 | if (error) |
4448 | goto out; | |
4449 | ||
e7fd4179 DT |
4450 | /* this is the value returned from do_unlock() on the master */ |
4451 | ||
00e99ccd | 4452 | switch (from_dlm_errno(le32_to_cpu(ms->m_result))) { |
e7fd4179 | 4453 | case -DLM_EUNLOCK: |
9f48eead | 4454 | receive_flags_reply(lkb, ms, local); |
e7fd4179 DT |
4455 | remove_lock_pc(r, lkb); |
4456 | queue_cast(r, lkb, -DLM_EUNLOCK); | |
4457 | break; | |
ef0c2bb0 DT |
4458 | case -ENOENT: |
4459 | break; | |
e7fd4179 | 4460 | default: |
ef0c2bb0 | 4461 | log_error(r->res_ls, "receive_unlock_reply %x error %d", |
00e99ccd | 4462 | lkb->lkb_id, from_dlm_errno(le32_to_cpu(ms->m_result))); |
e7fd4179 | 4463 | } |
ef0c2bb0 | 4464 | out: |
e7fd4179 DT |
4465 | unlock_rsb(r); |
4466 | put_rsb(r); | |
4467 | } | |
4468 | ||
6d40c4a7 | 4469 | static int receive_unlock_reply(struct dlm_ls *ls, struct dlm_message *ms) |
e7fd4179 DT |
4470 | { |
4471 | struct dlm_lkb *lkb; | |
4472 | int error; | |
4473 | ||
00e99ccd | 4474 | error = find_lkb(ls, le32_to_cpu(ms->m_remid), &lkb); |
6d40c4a7 DT |
4475 | if (error) |
4476 | return error; | |
e7fd4179 | 4477 | |
9f48eead | 4478 | _receive_unlock_reply(lkb, ms, false); |
b3f58d8f | 4479 | dlm_put_lkb(lkb); |
6d40c4a7 | 4480 | return 0; |
e7fd4179 DT |
4481 | } |
4482 | ||
9f48eead AA |
4483 | static void _receive_cancel_reply(struct dlm_lkb *lkb, struct dlm_message *ms, |
4484 | bool local) | |
e7fd4179 DT |
4485 | { |
4486 | struct dlm_rsb *r = lkb->lkb_resource; | |
ef0c2bb0 | 4487 | int error; |
e7fd4179 DT |
4488 | |
4489 | hold_rsb(r); | |
4490 | lock_rsb(r); | |
4491 | ||
c54e04b0 DT |
4492 | error = validate_message(lkb, ms); |
4493 | if (error) | |
4494 | goto out; | |
4495 | ||
a7e7ffac | 4496 | /* local reply can happen with waiters_mutex held */ |
9f48eead | 4497 | error = remove_from_waiters_ms(lkb, ms, local); |
ef0c2bb0 DT |
4498 | if (error) |
4499 | goto out; | |
4500 | ||
e7fd4179 DT |
4501 | /* this is the value returned from do_cancel() on the master */ |
4502 | ||
00e99ccd | 4503 | switch (from_dlm_errno(le32_to_cpu(ms->m_result))) { |
e7fd4179 | 4504 | case -DLM_ECANCEL: |
9f48eead | 4505 | receive_flags_reply(lkb, ms, local); |
e7fd4179 | 4506 | revert_lock_pc(r, lkb); |
84d8cd69 | 4507 | queue_cast(r, lkb, -DLM_ECANCEL); |
ef0c2bb0 DT |
4508 | break; |
4509 | case 0: | |
e7fd4179 DT |
4510 | break; |
4511 | default: | |
ef0c2bb0 | 4512 | log_error(r->res_ls, "receive_cancel_reply %x error %d", |
00e99ccd AA |
4513 | lkb->lkb_id, |
4514 | from_dlm_errno(le32_to_cpu(ms->m_result))); | |
e7fd4179 | 4515 | } |
ef0c2bb0 | 4516 | out: |
e7fd4179 DT |
4517 | unlock_rsb(r); |
4518 | put_rsb(r); | |
4519 | } | |
4520 | ||
6d40c4a7 | 4521 | static int receive_cancel_reply(struct dlm_ls *ls, struct dlm_message *ms) |
e7fd4179 DT |
4522 | { |
4523 | struct dlm_lkb *lkb; | |
4524 | int error; | |
4525 | ||
00e99ccd | 4526 | error = find_lkb(ls, le32_to_cpu(ms->m_remid), &lkb); |
6d40c4a7 DT |
4527 | if (error) |
4528 | return error; | |
e7fd4179 | 4529 | |
9f48eead | 4530 | _receive_cancel_reply(lkb, ms, false); |
b3f58d8f | 4531 | dlm_put_lkb(lkb); |
6d40c4a7 | 4532 | return 0; |
e7fd4179 DT |
4533 | } |
4534 | ||
4535 | static void receive_lookup_reply(struct dlm_ls *ls, struct dlm_message *ms) | |
4536 | { | |
4537 | struct dlm_lkb *lkb; | |
4538 | struct dlm_rsb *r; | |
4539 | int error, ret_nodeid; | |
c04fecb4 | 4540 | int do_lookup_list = 0; |
e7fd4179 | 4541 | |
00e99ccd | 4542 | error = find_lkb(ls, le32_to_cpu(ms->m_lkid), &lkb); |
e7fd4179 | 4543 | if (error) { |
00e99ccd AA |
4544 | log_error(ls, "%s no lkid %x", __func__, |
4545 | le32_to_cpu(ms->m_lkid)); | |
e7fd4179 DT |
4546 | return; |
4547 | } | |
4548 | ||
c04fecb4 | 4549 | /* ms->m_result is the value returned by dlm_master_lookup on dir node |
e7fd4179 | 4550 | FIXME: will a non-zero error ever be returned? */ |
e7fd4179 DT |
4551 | |
4552 | r = lkb->lkb_resource; | |
4553 | hold_rsb(r); | |
4554 | lock_rsb(r); | |
4555 | ||
ef0c2bb0 DT |
4556 | error = remove_from_waiters(lkb, DLM_MSG_LOOKUP_REPLY); |
4557 | if (error) | |
4558 | goto out; | |
4559 | ||
00e99ccd | 4560 | ret_nodeid = le32_to_cpu(ms->m_nodeid); |
c04fecb4 DT |
4561 | |
4562 | /* We sometimes receive a request from the dir node for this | |
4563 | rsb before we've received the dir node's loookup_reply for it. | |
4564 | The request from the dir node implies we're the master, so we set | |
4565 | ourself as master in receive_request_reply, and verify here that | |
4566 | we are indeed the master. */ | |
4567 | ||
4568 | if (r->res_master_nodeid && (r->res_master_nodeid != ret_nodeid)) { | |
4569 | /* This should never happen */ | |
4570 | log_error(ls, "receive_lookup_reply %x from %d ret %d " | |
4571 | "master %d dir %d our %d first %x %s", | |
3428785a AA |
4572 | lkb->lkb_id, le32_to_cpu(ms->m_header.h_nodeid), |
4573 | ret_nodeid, r->res_master_nodeid, r->res_dir_nodeid, | |
c04fecb4 DT |
4574 | dlm_our_nodeid(), r->res_first_lkid, r->res_name); |
4575 | } | |
4576 | ||
e7fd4179 | 4577 | if (ret_nodeid == dlm_our_nodeid()) { |
c04fecb4 | 4578 | r->res_master_nodeid = ret_nodeid; |
e7fd4179 | 4579 | r->res_nodeid = 0; |
c04fecb4 | 4580 | do_lookup_list = 1; |
e7fd4179 | 4581 | r->res_first_lkid = 0; |
c04fecb4 DT |
4582 | } else if (ret_nodeid == -1) { |
4583 | /* the remote node doesn't believe it's the dir node */ | |
4584 | log_error(ls, "receive_lookup_reply %x from %d bad ret_nodeid", | |
3428785a | 4585 | lkb->lkb_id, le32_to_cpu(ms->m_header.h_nodeid)); |
c04fecb4 DT |
4586 | r->res_master_nodeid = 0; |
4587 | r->res_nodeid = -1; | |
4588 | lkb->lkb_nodeid = -1; | |
e7fd4179 | 4589 | } else { |
c04fecb4 DT |
4590 | /* set_master() will set lkb_nodeid from r */ |
4591 | r->res_master_nodeid = ret_nodeid; | |
e7fd4179 DT |
4592 | r->res_nodeid = ret_nodeid; |
4593 | } | |
4594 | ||
ef0c2bb0 DT |
4595 | if (is_overlap(lkb)) { |
4596 | log_debug(ls, "receive_lookup_reply %x unlock %x", | |
e1af8728 | 4597 | lkb->lkb_id, dlm_iflags_val(lkb)); |
ef0c2bb0 DT |
4598 | queue_cast_overlap(r, lkb); |
4599 | unhold_lkb(lkb); /* undoes create_lkb() */ | |
4600 | goto out_list; | |
4601 | } | |
4602 | ||
e7fd4179 DT |
4603 | _request_lock(r, lkb); |
4604 | ||
ef0c2bb0 | 4605 | out_list: |
c04fecb4 | 4606 | if (do_lookup_list) |
e7fd4179 | 4607 | process_lookup_list(r); |
ef0c2bb0 | 4608 | out: |
e7fd4179 DT |
4609 | unlock_rsb(r); |
4610 | put_rsb(r); | |
b3f58d8f | 4611 | dlm_put_lkb(lkb); |
e7fd4179 DT |
4612 | } |
4613 | ||
6d40c4a7 DT |
4614 | static void _receive_message(struct dlm_ls *ls, struct dlm_message *ms, |
4615 | uint32_t saved_seq) | |
e7fd4179 | 4616 | { |
6d40c4a7 DT |
4617 | int error = 0, noent = 0; |
4618 | ||
3428785a | 4619 | if (!dlm_is_member(ls, le32_to_cpu(ms->m_header.h_nodeid))) { |
c04fecb4 | 4620 | log_limit(ls, "receive %d from non-member %d %x %x %d", |
00e99ccd AA |
4621 | le32_to_cpu(ms->m_type), |
4622 | le32_to_cpu(ms->m_header.h_nodeid), | |
4623 | le32_to_cpu(ms->m_lkid), le32_to_cpu(ms->m_remid), | |
4624 | from_dlm_errno(le32_to_cpu(ms->m_result))); | |
46b43eed DT |
4625 | return; |
4626 | } | |
4627 | ||
e7fd4179 DT |
4628 | switch (ms->m_type) { |
4629 | ||
4630 | /* messages sent to a master node */ | |
4631 | ||
00e99ccd | 4632 | case cpu_to_le32(DLM_MSG_REQUEST): |
6d40c4a7 | 4633 | error = receive_request(ls, ms); |
e7fd4179 DT |
4634 | break; |
4635 | ||
00e99ccd | 4636 | case cpu_to_le32(DLM_MSG_CONVERT): |
6d40c4a7 | 4637 | error = receive_convert(ls, ms); |
e7fd4179 DT |
4638 | break; |
4639 | ||
00e99ccd | 4640 | case cpu_to_le32(DLM_MSG_UNLOCK): |
6d40c4a7 | 4641 | error = receive_unlock(ls, ms); |
e7fd4179 DT |
4642 | break; |
4643 | ||
00e99ccd | 4644 | case cpu_to_le32(DLM_MSG_CANCEL): |
6d40c4a7 DT |
4645 | noent = 1; |
4646 | error = receive_cancel(ls, ms); | |
e7fd4179 DT |
4647 | break; |
4648 | ||
4649 | /* messages sent from a master node (replies to above) */ | |
4650 | ||
00e99ccd | 4651 | case cpu_to_le32(DLM_MSG_REQUEST_REPLY): |
6d40c4a7 | 4652 | error = receive_request_reply(ls, ms); |
e7fd4179 DT |
4653 | break; |
4654 | ||
00e99ccd | 4655 | case cpu_to_le32(DLM_MSG_CONVERT_REPLY): |
6d40c4a7 | 4656 | error = receive_convert_reply(ls, ms); |
e7fd4179 DT |
4657 | break; |
4658 | ||
00e99ccd | 4659 | case cpu_to_le32(DLM_MSG_UNLOCK_REPLY): |
6d40c4a7 | 4660 | error = receive_unlock_reply(ls, ms); |
e7fd4179 DT |
4661 | break; |
4662 | ||
00e99ccd | 4663 | case cpu_to_le32(DLM_MSG_CANCEL_REPLY): |
6d40c4a7 | 4664 | error = receive_cancel_reply(ls, ms); |
e7fd4179 DT |
4665 | break; |
4666 | ||
4667 | /* messages sent from a master node (only two types of async msg) */ | |
4668 | ||
00e99ccd | 4669 | case cpu_to_le32(DLM_MSG_GRANT): |
6d40c4a7 DT |
4670 | noent = 1; |
4671 | error = receive_grant(ls, ms); | |
e7fd4179 DT |
4672 | break; |
4673 | ||
00e99ccd | 4674 | case cpu_to_le32(DLM_MSG_BAST): |
6d40c4a7 DT |
4675 | noent = 1; |
4676 | error = receive_bast(ls, ms); | |
e7fd4179 DT |
4677 | break; |
4678 | ||
4679 | /* messages sent to a dir node */ | |
4680 | ||
00e99ccd | 4681 | case cpu_to_le32(DLM_MSG_LOOKUP): |
e7fd4179 DT |
4682 | receive_lookup(ls, ms); |
4683 | break; | |
4684 | ||
00e99ccd | 4685 | case cpu_to_le32(DLM_MSG_REMOVE): |
e7fd4179 DT |
4686 | receive_remove(ls, ms); |
4687 | break; | |
4688 | ||
4689 | /* messages sent from a dir node (remove has no reply) */ | |
4690 | ||
00e99ccd | 4691 | case cpu_to_le32(DLM_MSG_LOOKUP_REPLY): |
e7fd4179 DT |
4692 | receive_lookup_reply(ls, ms); |
4693 | break; | |
4694 | ||
8499137d DT |
4695 | /* other messages */ |
4696 | ||
00e99ccd | 4697 | case cpu_to_le32(DLM_MSG_PURGE): |
8499137d DT |
4698 | receive_purge(ls, ms); |
4699 | break; | |
4700 | ||
e7fd4179 | 4701 | default: |
00e99ccd AA |
4702 | log_error(ls, "unknown message type %d", |
4703 | le32_to_cpu(ms->m_type)); | |
e7fd4179 | 4704 | } |
6d40c4a7 DT |
4705 | |
4706 | /* | |
4707 | * When checking for ENOENT, we're checking the result of | |
4708 | * find_lkb(m_remid): | |
4709 | * | |
4710 | * The lock id referenced in the message wasn't found. This may | |
4711 | * happen in normal usage for the async messages and cancel, so | |
4712 | * only use log_debug for them. | |
4713 | * | |
4875647a | 4714 | * Some errors are expected and normal. |
6d40c4a7 DT |
4715 | */ |
4716 | ||
4717 | if (error == -ENOENT && noent) { | |
4875647a | 4718 | log_debug(ls, "receive %d no %x remote %d %x saved_seq %u", |
00e99ccd | 4719 | le32_to_cpu(ms->m_type), le32_to_cpu(ms->m_remid), |
3428785a | 4720 | le32_to_cpu(ms->m_header.h_nodeid), |
00e99ccd | 4721 | le32_to_cpu(ms->m_lkid), saved_seq); |
6d40c4a7 | 4722 | } else if (error == -ENOENT) { |
4875647a | 4723 | log_error(ls, "receive %d no %x remote %d %x saved_seq %u", |
00e99ccd | 4724 | le32_to_cpu(ms->m_type), le32_to_cpu(ms->m_remid), |
3428785a | 4725 | le32_to_cpu(ms->m_header.h_nodeid), |
00e99ccd | 4726 | le32_to_cpu(ms->m_lkid), saved_seq); |
6d40c4a7 | 4727 | |
00e99ccd AA |
4728 | if (ms->m_type == cpu_to_le32(DLM_MSG_CONVERT)) |
4729 | dlm_dump_rsb_hash(ls, le32_to_cpu(ms->m_hash)); | |
6d40c4a7 | 4730 | } |
4875647a DT |
4731 | |
4732 | if (error == -EINVAL) { | |
4733 | log_error(ls, "receive %d inval from %d lkid %x remid %x " | |
4734 | "saved_seq %u", | |
00e99ccd AA |
4735 | le32_to_cpu(ms->m_type), |
4736 | le32_to_cpu(ms->m_header.h_nodeid), | |
4737 | le32_to_cpu(ms->m_lkid), le32_to_cpu(ms->m_remid), | |
4738 | saved_seq); | |
4875647a | 4739 | } |
e7fd4179 DT |
4740 | } |
4741 | ||
c36258b5 DT |
4742 | /* If the lockspace is in recovery mode (locking stopped), then normal |
4743 | messages are saved on the requestqueue for processing after recovery is | |
4744 | done. When not in recovery mode, we wait for dlm_recoverd to drain saved | |
4745 | messages off the requestqueue before we process new ones. This occurs right | |
4746 | after recovery completes when we transition from saving all messages on | |
4747 | requestqueue, to processing all the saved messages, to processing new | |
4748 | messages as they arrive. */ | |
e7fd4179 | 4749 | |
c36258b5 DT |
4750 | static void dlm_receive_message(struct dlm_ls *ls, struct dlm_message *ms, |
4751 | int nodeid) | |
4752 | { | |
4753 | if (dlm_locking_stopped(ls)) { | |
c04fecb4 DT |
4754 | /* If we were a member of this lockspace, left, and rejoined, |
4755 | other nodes may still be sending us messages from the | |
4756 | lockspace generation before we left. */ | |
4757 | if (!ls->ls_generation) { | |
4758 | log_limit(ls, "receive %d from %d ignore old gen", | |
00e99ccd | 4759 | le32_to_cpu(ms->m_type), nodeid); |
c04fecb4 DT |
4760 | return; |
4761 | } | |
4762 | ||
8b0d8e03 | 4763 | dlm_add_requestqueue(ls, nodeid, ms); |
c36258b5 DT |
4764 | } else { |
4765 | dlm_wait_requestqueue(ls); | |
6d40c4a7 | 4766 | _receive_message(ls, ms, 0); |
c36258b5 DT |
4767 | } |
4768 | } | |
4769 | ||
4770 | /* This is called by dlm_recoverd to process messages that were saved on | |
4771 | the requestqueue. */ | |
4772 | ||
6d40c4a7 DT |
4773 | void dlm_receive_message_saved(struct dlm_ls *ls, struct dlm_message *ms, |
4774 | uint32_t saved_seq) | |
c36258b5 | 4775 | { |
6d40c4a7 | 4776 | _receive_message(ls, ms, saved_seq); |
c36258b5 DT |
4777 | } |
4778 | ||
4779 | /* This is called by the midcomms layer when something is received for | |
4780 | the lockspace. It could be either a MSG (normal message sent as part of | |
4781 | standard locking activity) or an RCOM (recovery message sent as part of | |
4782 | lockspace recovery). */ | |
4783 | ||
eef7d739 | 4784 | void dlm_receive_buffer(union dlm_packet *p, int nodeid) |
c36258b5 | 4785 | { |
eef7d739 | 4786 | struct dlm_header *hd = &p->header; |
c36258b5 DT |
4787 | struct dlm_ls *ls; |
4788 | int type = 0; | |
4789 | ||
4790 | switch (hd->h_cmd) { | |
4791 | case DLM_MSG: | |
00e99ccd | 4792 | type = le32_to_cpu(p->message.m_type); |
c36258b5 DT |
4793 | break; |
4794 | case DLM_RCOM: | |
2f9dbeda | 4795 | type = le32_to_cpu(p->rcom.rc_type); |
c36258b5 DT |
4796 | break; |
4797 | default: | |
4798 | log_print("invalid h_cmd %d from %u", hd->h_cmd, nodeid); | |
4799 | return; | |
4800 | } | |
4801 | ||
3428785a | 4802 | if (le32_to_cpu(hd->h_nodeid) != nodeid) { |
c36258b5 | 4803 | log_print("invalid h_nodeid %d from %d lockspace %x", |
3428785a AA |
4804 | le32_to_cpu(hd->h_nodeid), nodeid, |
4805 | le32_to_cpu(hd->u.h_lockspace)); | |
c36258b5 DT |
4806 | return; |
4807 | } | |
4808 | ||
3428785a | 4809 | ls = dlm_find_lockspace_global(le32_to_cpu(hd->u.h_lockspace)); |
c36258b5 | 4810 | if (!ls) { |
4875647a DT |
4811 | if (dlm_config.ci_log_debug) { |
4812 | printk_ratelimited(KERN_DEBUG "dlm: invalid lockspace " | |
4813 | "%u from %d cmd %d type %d\n", | |
3428785a AA |
4814 | le32_to_cpu(hd->u.h_lockspace), nodeid, |
4815 | hd->h_cmd, type); | |
4875647a | 4816 | } |
c36258b5 DT |
4817 | |
4818 | if (hd->h_cmd == DLM_RCOM && type == DLM_RCOM_STATUS) | |
eef7d739 | 4819 | dlm_send_ls_not_ready(nodeid, &p->rcom); |
c36258b5 DT |
4820 | return; |
4821 | } | |
4822 | ||
4823 | /* this rwsem allows dlm_ls_stop() to wait for all dlm_recv threads to | |
4824 | be inactive (in this ls) before transitioning to recovery mode */ | |
4825 | ||
4826 | down_read(&ls->ls_recv_active); | |
4827 | if (hd->h_cmd == DLM_MSG) | |
eef7d739 | 4828 | dlm_receive_message(ls, &p->message, nodeid); |
f45307d3 | 4829 | else if (hd->h_cmd == DLM_RCOM) |
eef7d739 | 4830 | dlm_receive_rcom(ls, &p->rcom, nodeid); |
f45307d3 AA |
4831 | else |
4832 | log_error(ls, "invalid h_cmd %d from %d lockspace %x", | |
4833 | hd->h_cmd, nodeid, le32_to_cpu(hd->u.h_lockspace)); | |
c36258b5 DT |
4834 | up_read(&ls->ls_recv_active); |
4835 | ||
4836 | dlm_put_lockspace(ls); | |
4837 | } | |
e7fd4179 | 4838 | |
2a7ce0ed | 4839 | static void recover_convert_waiter(struct dlm_ls *ls, struct dlm_lkb *lkb, |
a7e7ffac | 4840 | struct dlm_message *ms_local) |
e7fd4179 DT |
4841 | { |
4842 | if (middle_conversion(lkb)) { | |
4843 | hold_lkb(lkb); | |
a7e7ffac | 4844 | memset(ms_local, 0, sizeof(struct dlm_message)); |
a7e7ffac AA |
4845 | ms_local->m_type = cpu_to_le32(DLM_MSG_CONVERT_REPLY); |
4846 | ms_local->m_result = cpu_to_le32(to_dlm_errno(-EINPROGRESS)); | |
4847 | ms_local->m_header.h_nodeid = cpu_to_le32(lkb->lkb_nodeid); | |
9f48eead | 4848 | _receive_convert_reply(lkb, ms_local, true); |
e7fd4179 DT |
4849 | |
4850 | /* Same special case as in receive_rcom_lock_args() */ | |
4851 | lkb->lkb_grmode = DLM_LOCK_IV; | |
4852 | rsb_set_flag(lkb->lkb_resource, RSB_RECOVER_CONVERT); | |
4853 | unhold_lkb(lkb); | |
4854 | ||
4855 | } else if (lkb->lkb_rqmode >= lkb->lkb_grmode) { | |
e1af8728 | 4856 | set_bit(DLM_IFL_RESEND_BIT, &lkb->lkb_iflags); |
e7fd4179 DT |
4857 | } |
4858 | ||
4859 | /* lkb->lkb_rqmode < lkb->lkb_grmode shouldn't happen since down | |
4860 | conversions are async; there's no reply from the remote master */ | |
4861 | } | |
4862 | ||
4863 | /* A waiting lkb needs recovery if the master node has failed, or | |
4864 | the master node is changing (only when no directory is used) */ | |
4865 | ||
13ef1111 DT |
4866 | static int waiter_needs_recovery(struct dlm_ls *ls, struct dlm_lkb *lkb, |
4867 | int dir_nodeid) | |
e7fd4179 | 4868 | { |
4875647a | 4869 | if (dlm_no_directory(ls)) |
13ef1111 DT |
4870 | return 1; |
4871 | ||
4875647a | 4872 | if (dlm_is_removed(ls, lkb->lkb_wait_nodeid)) |
e7fd4179 DT |
4873 | return 1; |
4874 | ||
4875 | return 0; | |
4876 | } | |
4877 | ||
4878 | /* Recovery for locks that are waiting for replies from nodes that are now | |
4879 | gone. We can just complete unlocks and cancels by faking a reply from the | |
4880 | dead node. Requests and up-conversions we flag to be resent after | |
4881 | recovery. Down-conversions can just be completed with a fake reply like | |
4882 | unlocks. Conversions between PR and CW need special attention. */ | |
4883 | ||
4884 | void dlm_recover_waiters_pre(struct dlm_ls *ls) | |
4885 | { | |
4886 | struct dlm_lkb *lkb, *safe; | |
a7e7ffac AA |
4887 | struct dlm_message *ms_local; |
4888 | int wait_type, local_unlock_result, local_cancel_result; | |
13ef1111 | 4889 | int dir_nodeid; |
e7fd4179 | 4890 | |
a7e7ffac AA |
4891 | ms_local = kmalloc(sizeof(*ms_local), GFP_KERNEL); |
4892 | if (!ms_local) | |
2a7ce0ed | 4893 | return; |
2a7ce0ed | 4894 | |
90135925 | 4895 | mutex_lock(&ls->ls_waiters_mutex); |
e7fd4179 DT |
4896 | |
4897 | list_for_each_entry_safe(lkb, safe, &ls->ls_waiters, lkb_wait_reply) { | |
2a7ce0ed | 4898 | |
13ef1111 DT |
4899 | dir_nodeid = dlm_dir_nodeid(lkb->lkb_resource); |
4900 | ||
2a7ce0ed DT |
4901 | /* exclude debug messages about unlocks because there can be so |
4902 | many and they aren't very interesting */ | |
4903 | ||
4904 | if (lkb->lkb_wait_type != DLM_MSG_UNLOCK) { | |
13ef1111 DT |
4905 | log_debug(ls, "waiter %x remote %x msg %d r_nodeid %d " |
4906 | "lkb_nodeid %d wait_nodeid %d dir_nodeid %d", | |
4907 | lkb->lkb_id, | |
4908 | lkb->lkb_remid, | |
4909 | lkb->lkb_wait_type, | |
4910 | lkb->lkb_resource->res_nodeid, | |
4911 | lkb->lkb_nodeid, | |
4912 | lkb->lkb_wait_nodeid, | |
4913 | dir_nodeid); | |
2a7ce0ed | 4914 | } |
e7fd4179 DT |
4915 | |
4916 | /* all outstanding lookups, regardless of destination will be | |
4917 | resent after recovery is done */ | |
4918 | ||
4919 | if (lkb->lkb_wait_type == DLM_MSG_LOOKUP) { | |
e1af8728 | 4920 | set_bit(DLM_IFL_RESEND_BIT, &lkb->lkb_iflags); |
e7fd4179 DT |
4921 | continue; |
4922 | } | |
4923 | ||
13ef1111 | 4924 | if (!waiter_needs_recovery(ls, lkb, dir_nodeid)) |
e7fd4179 DT |
4925 | continue; |
4926 | ||
601342ce | 4927 | wait_type = lkb->lkb_wait_type; |
a7e7ffac AA |
4928 | local_unlock_result = -DLM_EUNLOCK; |
4929 | local_cancel_result = -DLM_ECANCEL; | |
601342ce DT |
4930 | |
4931 | /* Main reply may have been received leaving a zero wait_type, | |
4932 | but a reply for the overlapping op may not have been | |
4933 | received. In that case we need to fake the appropriate | |
4934 | reply for the overlap op. */ | |
4935 | ||
4936 | if (!wait_type) { | |
4937 | if (is_overlap_cancel(lkb)) { | |
4938 | wait_type = DLM_MSG_CANCEL; | |
4939 | if (lkb->lkb_grmode == DLM_LOCK_IV) | |
a7e7ffac | 4940 | local_cancel_result = 0; |
601342ce DT |
4941 | } |
4942 | if (is_overlap_unlock(lkb)) { | |
4943 | wait_type = DLM_MSG_UNLOCK; | |
4944 | if (lkb->lkb_grmode == DLM_LOCK_IV) | |
a7e7ffac | 4945 | local_unlock_result = -ENOENT; |
601342ce DT |
4946 | } |
4947 | ||
4948 | log_debug(ls, "rwpre overlap %x %x %d %d %d", | |
e1af8728 | 4949 | lkb->lkb_id, dlm_iflags_val(lkb), wait_type, |
a7e7ffac | 4950 | local_cancel_result, local_unlock_result); |
601342ce DT |
4951 | } |
4952 | ||
4953 | switch (wait_type) { | |
e7fd4179 DT |
4954 | |
4955 | case DLM_MSG_REQUEST: | |
e1af8728 | 4956 | set_bit(DLM_IFL_RESEND_BIT, &lkb->lkb_iflags); |
e7fd4179 DT |
4957 | break; |
4958 | ||
4959 | case DLM_MSG_CONVERT: | |
a7e7ffac | 4960 | recover_convert_waiter(ls, lkb, ms_local); |
e7fd4179 DT |
4961 | break; |
4962 | ||
4963 | case DLM_MSG_UNLOCK: | |
4964 | hold_lkb(lkb); | |
a7e7ffac | 4965 | memset(ms_local, 0, sizeof(struct dlm_message)); |
a7e7ffac AA |
4966 | ms_local->m_type = cpu_to_le32(DLM_MSG_UNLOCK_REPLY); |
4967 | ms_local->m_result = cpu_to_le32(to_dlm_errno(local_unlock_result)); | |
4968 | ms_local->m_header.h_nodeid = cpu_to_le32(lkb->lkb_nodeid); | |
9f48eead | 4969 | _receive_unlock_reply(lkb, ms_local, true); |
b3f58d8f | 4970 | dlm_put_lkb(lkb); |
e7fd4179 DT |
4971 | break; |
4972 | ||
4973 | case DLM_MSG_CANCEL: | |
4974 | hold_lkb(lkb); | |
a7e7ffac | 4975 | memset(ms_local, 0, sizeof(struct dlm_message)); |
a7e7ffac AA |
4976 | ms_local->m_type = cpu_to_le32(DLM_MSG_CANCEL_REPLY); |
4977 | ms_local->m_result = cpu_to_le32(to_dlm_errno(local_cancel_result)); | |
4978 | ms_local->m_header.h_nodeid = cpu_to_le32(lkb->lkb_nodeid); | |
9f48eead | 4979 | _receive_cancel_reply(lkb, ms_local, true); |
b3f58d8f | 4980 | dlm_put_lkb(lkb); |
e7fd4179 DT |
4981 | break; |
4982 | ||
4983 | default: | |
601342ce DT |
4984 | log_error(ls, "invalid lkb wait_type %d %d", |
4985 | lkb->lkb_wait_type, wait_type); | |
e7fd4179 | 4986 | } |
81456807 | 4987 | schedule(); |
e7fd4179 | 4988 | } |
90135925 | 4989 | mutex_unlock(&ls->ls_waiters_mutex); |
a7e7ffac | 4990 | kfree(ms_local); |
e7fd4179 DT |
4991 | } |
4992 | ||
ef0c2bb0 | 4993 | static struct dlm_lkb *find_resend_waiter(struct dlm_ls *ls) |
e7fd4179 | 4994 | { |
dc1acd5c | 4995 | struct dlm_lkb *lkb = NULL, *iter; |
e7fd4179 | 4996 | |
90135925 | 4997 | mutex_lock(&ls->ls_waiters_mutex); |
dc1acd5c | 4998 | list_for_each_entry(iter, &ls->ls_waiters, lkb_wait_reply) { |
e1af8728 | 4999 | if (test_bit(DLM_IFL_RESEND_BIT, &iter->lkb_iflags)) { |
dc1acd5c JK |
5000 | hold_lkb(iter); |
5001 | lkb = iter; | |
e7fd4179 DT |
5002 | break; |
5003 | } | |
5004 | } | |
90135925 | 5005 | mutex_unlock(&ls->ls_waiters_mutex); |
e7fd4179 | 5006 | |
ef0c2bb0 | 5007 | return lkb; |
e7fd4179 DT |
5008 | } |
5009 | ||
5010 | /* Deal with lookups and lkb's marked RESEND from _pre. We may now be the | |
5011 | master or dir-node for r. Processing the lkb may result in it being placed | |
5012 | back on waiters. */ | |
5013 | ||
ef0c2bb0 DT |
5014 | /* We do this after normal locking has been enabled and any saved messages |
5015 | (in requestqueue) have been processed. We should be confident that at | |
5016 | this point we won't get or process a reply to any of these waiting | |
5017 | operations. But, new ops may be coming in on the rsbs/locks here from | |
5018 | userspace or remotely. */ | |
5019 | ||
5020 | /* there may have been an overlap unlock/cancel prior to recovery or after | |
5021 | recovery. if before, the lkb may still have a pos wait_count; if after, the | |
5022 | overlap flag would just have been set and nothing new sent. we can be | |
5023 | confident here than any replies to either the initial op or overlap ops | |
5024 | prior to recovery have been received. */ | |
5025 | ||
e7fd4179 DT |
5026 | int dlm_recover_waiters_post(struct dlm_ls *ls) |
5027 | { | |
5028 | struct dlm_lkb *lkb; | |
5029 | struct dlm_rsb *r; | |
ef0c2bb0 | 5030 | int error = 0, mstype, err, oc, ou; |
e7fd4179 DT |
5031 | |
5032 | while (1) { | |
5033 | if (dlm_locking_stopped(ls)) { | |
5034 | log_debug(ls, "recover_waiters_post aborted"); | |
5035 | error = -EINTR; | |
5036 | break; | |
5037 | } | |
5038 | ||
ef0c2bb0 DT |
5039 | lkb = find_resend_waiter(ls); |
5040 | if (!lkb) | |
e7fd4179 DT |
5041 | break; |
5042 | ||
5043 | r = lkb->lkb_resource; | |
ef0c2bb0 DT |
5044 | hold_rsb(r); |
5045 | lock_rsb(r); | |
5046 | ||
5047 | mstype = lkb->lkb_wait_type; | |
e1af8728 AA |
5048 | oc = test_and_clear_bit(DLM_IFL_OVERLAP_CANCEL_BIT, |
5049 | &lkb->lkb_iflags); | |
5050 | ou = test_and_clear_bit(DLM_IFL_OVERLAP_UNLOCK_BIT, | |
5051 | &lkb->lkb_iflags); | |
ef0c2bb0 | 5052 | err = 0; |
e7fd4179 | 5053 | |
13ef1111 DT |
5054 | log_debug(ls, "waiter %x remote %x msg %d r_nodeid %d " |
5055 | "lkb_nodeid %d wait_nodeid %d dir_nodeid %d " | |
5056 | "overlap %d %d", lkb->lkb_id, lkb->lkb_remid, mstype, | |
5057 | r->res_nodeid, lkb->lkb_nodeid, lkb->lkb_wait_nodeid, | |
5058 | dlm_dir_nodeid(r), oc, ou); | |
e7fd4179 | 5059 | |
ef0c2bb0 DT |
5060 | /* At this point we assume that we won't get a reply to any |
5061 | previous op or overlap op on this lock. First, do a big | |
5062 | remove_from_waiters() for all previous ops. */ | |
5063 | ||
e1af8728 | 5064 | clear_bit(DLM_IFL_RESEND_BIT, &lkb->lkb_iflags); |
ef0c2bb0 | 5065 | lkb->lkb_wait_type = 0; |
1689c169 AA |
5066 | /* drop all wait_count references we still |
5067 | * hold a reference for this iteration. | |
5068 | */ | |
5069 | while (lkb->lkb_wait_count) { | |
5070 | lkb->lkb_wait_count--; | |
5071 | unhold_lkb(lkb); | |
5072 | } | |
ef0c2bb0 DT |
5073 | mutex_lock(&ls->ls_waiters_mutex); |
5074 | list_del_init(&lkb->lkb_wait_reply); | |
5075 | mutex_unlock(&ls->ls_waiters_mutex); | |
ef0c2bb0 DT |
5076 | |
5077 | if (oc || ou) { | |
5078 | /* do an unlock or cancel instead of resending */ | |
5079 | switch (mstype) { | |
5080 | case DLM_MSG_LOOKUP: | |
5081 | case DLM_MSG_REQUEST: | |
5082 | queue_cast(r, lkb, ou ? -DLM_EUNLOCK : | |
5083 | -DLM_ECANCEL); | |
5084 | unhold_lkb(lkb); /* undoes create_lkb() */ | |
5085 | break; | |
5086 | case DLM_MSG_CONVERT: | |
5087 | if (oc) { | |
5088 | queue_cast(r, lkb, -DLM_ECANCEL); | |
5089 | } else { | |
5090 | lkb->lkb_exflags |= DLM_LKF_FORCEUNLOCK; | |
5091 | _unlock_lock(r, lkb); | |
5092 | } | |
5093 | break; | |
5094 | default: | |
5095 | err = 1; | |
5096 | } | |
5097 | } else { | |
5098 | switch (mstype) { | |
5099 | case DLM_MSG_LOOKUP: | |
5100 | case DLM_MSG_REQUEST: | |
5101 | _request_lock(r, lkb); | |
5102 | if (is_master(r)) | |
5103 | confirm_master(r, 0); | |
5104 | break; | |
5105 | case DLM_MSG_CONVERT: | |
5106 | _convert_lock(r, lkb); | |
5107 | break; | |
5108 | default: | |
5109 | err = 1; | |
5110 | } | |
e7fd4179 | 5111 | } |
ef0c2bb0 | 5112 | |
13ef1111 DT |
5113 | if (err) { |
5114 | log_error(ls, "waiter %x msg %d r_nodeid %d " | |
5115 | "dir_nodeid %d overlap %d %d", | |
5116 | lkb->lkb_id, mstype, r->res_nodeid, | |
5117 | dlm_dir_nodeid(r), oc, ou); | |
5118 | } | |
ef0c2bb0 DT |
5119 | unlock_rsb(r); |
5120 | put_rsb(r); | |
5121 | dlm_put_lkb(lkb); | |
e7fd4179 DT |
5122 | } |
5123 | ||
5124 | return error; | |
5125 | } | |
5126 | ||
4875647a DT |
5127 | static void purge_mstcpy_list(struct dlm_ls *ls, struct dlm_rsb *r, |
5128 | struct list_head *list) | |
e7fd4179 | 5129 | { |
e7fd4179 DT |
5130 | struct dlm_lkb *lkb, *safe; |
5131 | ||
4875647a DT |
5132 | list_for_each_entry_safe(lkb, safe, list, lkb_statequeue) { |
5133 | if (!is_master_copy(lkb)) | |
5134 | continue; | |
5135 | ||
5136 | /* don't purge lkbs we've added in recover_master_copy for | |
5137 | the current recovery seq */ | |
5138 | ||
5139 | if (lkb->lkb_recover_seq == ls->ls_recover_seq) | |
5140 | continue; | |
5141 | ||
5142 | del_lkb(r, lkb); | |
5143 | ||
5144 | /* this put should free the lkb */ | |
5145 | if (!dlm_put_lkb(lkb)) | |
5146 | log_error(ls, "purged mstcpy lkb not released"); | |
e7fd4179 DT |
5147 | } |
5148 | } | |
5149 | ||
4875647a | 5150 | void dlm_purge_mstcpy_locks(struct dlm_rsb *r) |
e7fd4179 | 5151 | { |
4875647a | 5152 | struct dlm_ls *ls = r->res_ls; |
e7fd4179 | 5153 | |
4875647a DT |
5154 | purge_mstcpy_list(ls, r, &r->res_grantqueue); |
5155 | purge_mstcpy_list(ls, r, &r->res_convertqueue); | |
5156 | purge_mstcpy_list(ls, r, &r->res_waitqueue); | |
e7fd4179 DT |
5157 | } |
5158 | ||
4875647a DT |
5159 | static void purge_dead_list(struct dlm_ls *ls, struct dlm_rsb *r, |
5160 | struct list_head *list, | |
5161 | int nodeid_gone, unsigned int *count) | |
e7fd4179 | 5162 | { |
4875647a | 5163 | struct dlm_lkb *lkb, *safe; |
e7fd4179 | 5164 | |
4875647a DT |
5165 | list_for_each_entry_safe(lkb, safe, list, lkb_statequeue) { |
5166 | if (!is_master_copy(lkb)) | |
5167 | continue; | |
5168 | ||
5169 | if ((lkb->lkb_nodeid == nodeid_gone) || | |
5170 | dlm_is_removed(ls, lkb->lkb_nodeid)) { | |
5171 | ||
da8c6663 DT |
5172 | /* tell recover_lvb to invalidate the lvb |
5173 | because a node holding EX/PW failed */ | |
5174 | if ((lkb->lkb_exflags & DLM_LKF_VALBLK) && | |
5175 | (lkb->lkb_grmode >= DLM_LOCK_PW)) { | |
5176 | rsb_set_flag(r, RSB_RECOVER_LVB_INVAL); | |
5177 | } | |
5178 | ||
4875647a DT |
5179 | del_lkb(r, lkb); |
5180 | ||
5181 | /* this put should free the lkb */ | |
5182 | if (!dlm_put_lkb(lkb)) | |
5183 | log_error(ls, "purged dead lkb not released"); | |
5184 | ||
5185 | rsb_set_flag(r, RSB_RECOVER_GRANT); | |
5186 | ||
5187 | (*count)++; | |
5188 | } | |
5189 | } | |
e7fd4179 DT |
5190 | } |
5191 | ||
5192 | /* Get rid of locks held by nodes that are gone. */ | |
5193 | ||
4875647a | 5194 | void dlm_recover_purge(struct dlm_ls *ls) |
e7fd4179 DT |
5195 | { |
5196 | struct dlm_rsb *r; | |
4875647a DT |
5197 | struct dlm_member *memb; |
5198 | int nodes_count = 0; | |
5199 | int nodeid_gone = 0; | |
5200 | unsigned int lkb_count = 0; | |
5201 | ||
5202 | /* cache one removed nodeid to optimize the common | |
5203 | case of a single node removed */ | |
5204 | ||
5205 | list_for_each_entry(memb, &ls->ls_nodes_gone, list) { | |
5206 | nodes_count++; | |
5207 | nodeid_gone = memb->nodeid; | |
5208 | } | |
e7fd4179 | 5209 | |
4875647a DT |
5210 | if (!nodes_count) |
5211 | return; | |
e7fd4179 DT |
5212 | |
5213 | down_write(&ls->ls_root_sem); | |
5214 | list_for_each_entry(r, &ls->ls_root_list, res_root_list) { | |
5215 | hold_rsb(r); | |
5216 | lock_rsb(r); | |
4875647a DT |
5217 | if (is_master(r)) { |
5218 | purge_dead_list(ls, r, &r->res_grantqueue, | |
5219 | nodeid_gone, &lkb_count); | |
5220 | purge_dead_list(ls, r, &r->res_convertqueue, | |
5221 | nodeid_gone, &lkb_count); | |
5222 | purge_dead_list(ls, r, &r->res_waitqueue, | |
5223 | nodeid_gone, &lkb_count); | |
5224 | } | |
e7fd4179 DT |
5225 | unlock_rsb(r); |
5226 | unhold_rsb(r); | |
4875647a | 5227 | cond_resched(); |
e7fd4179 DT |
5228 | } |
5229 | up_write(&ls->ls_root_sem); | |
5230 | ||
4875647a | 5231 | if (lkb_count) |
075f0177 | 5232 | log_rinfo(ls, "dlm_recover_purge %u locks for %u nodes", |
4875647a | 5233 | lkb_count, nodes_count); |
e7fd4179 DT |
5234 | } |
5235 | ||
4875647a | 5236 | static struct dlm_rsb *find_grant_rsb(struct dlm_ls *ls, int bucket) |
97a35d1e | 5237 | { |
9beb3bf5 | 5238 | struct rb_node *n; |
4875647a | 5239 | struct dlm_rsb *r; |
97a35d1e | 5240 | |
c7be761a | 5241 | spin_lock(&ls->ls_rsbtbl[bucket].lock); |
9beb3bf5 BP |
5242 | for (n = rb_first(&ls->ls_rsbtbl[bucket].keep); n; n = rb_next(n)) { |
5243 | r = rb_entry(n, struct dlm_rsb, res_hashnode); | |
4875647a DT |
5244 | |
5245 | if (!rsb_flag(r, RSB_RECOVER_GRANT)) | |
5246 | continue; | |
c503a621 DT |
5247 | if (!is_master(r)) { |
5248 | rsb_clear_flag(r, RSB_RECOVER_GRANT); | |
97a35d1e | 5249 | continue; |
c503a621 | 5250 | } |
97a35d1e | 5251 | hold_rsb(r); |
4875647a DT |
5252 | spin_unlock(&ls->ls_rsbtbl[bucket].lock); |
5253 | return r; | |
97a35d1e | 5254 | } |
c7be761a | 5255 | spin_unlock(&ls->ls_rsbtbl[bucket].lock); |
4875647a | 5256 | return NULL; |
97a35d1e DT |
5257 | } |
5258 | ||
4875647a DT |
5259 | /* |
5260 | * Attempt to grant locks on resources that we are the master of. | |
5261 | * Locks may have become grantable during recovery because locks | |
5262 | * from departed nodes have been purged (or not rebuilt), allowing | |
5263 | * previously blocked locks to now be granted. The subset of rsb's | |
5264 | * we are interested in are those with lkb's on either the convert or | |
5265 | * waiting queues. | |
5266 | * | |
5267 | * Simplest would be to go through each master rsb and check for non-empty | |
5268 | * convert or waiting queues, and attempt to grant on those rsbs. | |
5269 | * Checking the queues requires lock_rsb, though, for which we'd need | |
5270 | * to release the rsbtbl lock. This would make iterating through all | |
5271 | * rsb's very inefficient. So, we rely on earlier recovery routines | |
5272 | * to set RECOVER_GRANT on any rsb's that we should attempt to grant | |
5273 | * locks for. | |
5274 | */ | |
5275 | ||
5276 | void dlm_recover_grant(struct dlm_ls *ls) | |
e7fd4179 DT |
5277 | { |
5278 | struct dlm_rsb *r; | |
2b4e926a | 5279 | int bucket = 0; |
4875647a DT |
5280 | unsigned int count = 0; |
5281 | unsigned int rsb_count = 0; | |
5282 | unsigned int lkb_count = 0; | |
e7fd4179 | 5283 | |
2b4e926a | 5284 | while (1) { |
4875647a | 5285 | r = find_grant_rsb(ls, bucket); |
2b4e926a DT |
5286 | if (!r) { |
5287 | if (bucket == ls->ls_rsbtbl_size - 1) | |
5288 | break; | |
5289 | bucket++; | |
97a35d1e | 5290 | continue; |
2b4e926a | 5291 | } |
4875647a DT |
5292 | rsb_count++; |
5293 | count = 0; | |
97a35d1e | 5294 | lock_rsb(r); |
c503a621 | 5295 | /* the RECOVER_GRANT flag is checked in the grant path */ |
4875647a | 5296 | grant_pending_locks(r, &count); |
c503a621 | 5297 | rsb_clear_flag(r, RSB_RECOVER_GRANT); |
4875647a DT |
5298 | lkb_count += count; |
5299 | confirm_master(r, 0); | |
97a35d1e DT |
5300 | unlock_rsb(r); |
5301 | put_rsb(r); | |
4875647a | 5302 | cond_resched(); |
e7fd4179 | 5303 | } |
4875647a DT |
5304 | |
5305 | if (lkb_count) | |
075f0177 | 5306 | log_rinfo(ls, "dlm_recover_grant %u locks on %u resources", |
4875647a | 5307 | lkb_count, rsb_count); |
e7fd4179 DT |
5308 | } |
5309 | ||
5310 | static struct dlm_lkb *search_remid_list(struct list_head *head, int nodeid, | |
5311 | uint32_t remid) | |
5312 | { | |
5313 | struct dlm_lkb *lkb; | |
5314 | ||
5315 | list_for_each_entry(lkb, head, lkb_statequeue) { | |
5316 | if (lkb->lkb_nodeid == nodeid && lkb->lkb_remid == remid) | |
5317 | return lkb; | |
5318 | } | |
5319 | return NULL; | |
5320 | } | |
5321 | ||
5322 | static struct dlm_lkb *search_remid(struct dlm_rsb *r, int nodeid, | |
5323 | uint32_t remid) | |
5324 | { | |
5325 | struct dlm_lkb *lkb; | |
5326 | ||
5327 | lkb = search_remid_list(&r->res_grantqueue, nodeid, remid); | |
5328 | if (lkb) | |
5329 | return lkb; | |
5330 | lkb = search_remid_list(&r->res_convertqueue, nodeid, remid); | |
5331 | if (lkb) | |
5332 | return lkb; | |
5333 | lkb = search_remid_list(&r->res_waitqueue, nodeid, remid); | |
5334 | if (lkb) | |
5335 | return lkb; | |
5336 | return NULL; | |
5337 | } | |
5338 | ||
ae773d0b | 5339 | /* needs at least dlm_rcom + rcom_lock */ |
e7fd4179 DT |
5340 | static int receive_rcom_lock_args(struct dlm_ls *ls, struct dlm_lkb *lkb, |
5341 | struct dlm_rsb *r, struct dlm_rcom *rc) | |
5342 | { | |
5343 | struct rcom_lock *rl = (struct rcom_lock *) rc->rc_buf; | |
e7fd4179 | 5344 | |
3428785a | 5345 | lkb->lkb_nodeid = le32_to_cpu(rc->rc_header.h_nodeid); |
163a1859 AV |
5346 | lkb->lkb_ownpid = le32_to_cpu(rl->rl_ownpid); |
5347 | lkb->lkb_remid = le32_to_cpu(rl->rl_lkid); | |
5348 | lkb->lkb_exflags = le32_to_cpu(rl->rl_exflags); | |
8a39dcd9 | 5349 | dlm_set_dflags_val(lkb, le32_to_cpu(rl->rl_flags)); |
e1af8728 | 5350 | set_bit(DLM_IFL_MSTCPY_BIT, &lkb->lkb_iflags); |
163a1859 | 5351 | lkb->lkb_lvbseq = le32_to_cpu(rl->rl_lvbseq); |
e7fd4179 DT |
5352 | lkb->lkb_rqmode = rl->rl_rqmode; |
5353 | lkb->lkb_grmode = rl->rl_grmode; | |
5354 | /* don't set lkb_status because add_lkb wants to itself */ | |
5355 | ||
8304d6f2 DT |
5356 | lkb->lkb_bastfn = (rl->rl_asts & DLM_CB_BAST) ? &fake_bastfn : NULL; |
5357 | lkb->lkb_astfn = (rl->rl_asts & DLM_CB_CAST) ? &fake_astfn : NULL; | |
e7fd4179 | 5358 | |
e7fd4179 | 5359 | if (lkb->lkb_exflags & DLM_LKF_VALBLK) { |
3428785a AA |
5360 | int lvblen = le16_to_cpu(rc->rc_header.h_length) - |
5361 | sizeof(struct dlm_rcom) - sizeof(struct rcom_lock); | |
a5dd0631 AV |
5362 | if (lvblen > ls->ls_lvblen) |
5363 | return -EINVAL; | |
52bda2b5 | 5364 | lkb->lkb_lvbptr = dlm_allocate_lvb(ls); |
e7fd4179 DT |
5365 | if (!lkb->lkb_lvbptr) |
5366 | return -ENOMEM; | |
e7fd4179 DT |
5367 | memcpy(lkb->lkb_lvbptr, rl->rl_lvb, lvblen); |
5368 | } | |
5369 | ||
5370 | /* Conversions between PR and CW (middle modes) need special handling. | |
5371 | The real granted mode of these converting locks cannot be determined | |
5372 | until all locks have been rebuilt on the rsb (recover_conversion) */ | |
5373 | ||
163a1859 AV |
5374 | if (rl->rl_wait_type == cpu_to_le16(DLM_MSG_CONVERT) && |
5375 | middle_conversion(lkb)) { | |
e7fd4179 DT |
5376 | rl->rl_status = DLM_LKSTS_CONVERT; |
5377 | lkb->lkb_grmode = DLM_LOCK_IV; | |
5378 | rsb_set_flag(r, RSB_RECOVER_CONVERT); | |
5379 | } | |
5380 | ||
5381 | return 0; | |
5382 | } | |
5383 | ||
5384 | /* This lkb may have been recovered in a previous aborted recovery so we need | |
5385 | to check if the rsb already has an lkb with the given remote nodeid/lkid. | |
5386 | If so we just send back a standard reply. If not, we create a new lkb with | |
5387 | the given values and send back our lkid. We send back our lkid by sending | |
5388 | back the rcom_lock struct we got but with the remid field filled in. */ | |
5389 | ||
ae773d0b | 5390 | /* needs at least dlm_rcom + rcom_lock */ |
e7fd4179 DT |
5391 | int dlm_recover_master_copy(struct dlm_ls *ls, struct dlm_rcom *rc) |
5392 | { | |
5393 | struct rcom_lock *rl = (struct rcom_lock *) rc->rc_buf; | |
5394 | struct dlm_rsb *r; | |
5395 | struct dlm_lkb *lkb; | |
6d40c4a7 | 5396 | uint32_t remid = 0; |
3428785a | 5397 | int from_nodeid = le32_to_cpu(rc->rc_header.h_nodeid); |
e7fd4179 DT |
5398 | int error; |
5399 | ||
5400 | if (rl->rl_parent_lkid) { | |
5401 | error = -EOPNOTSUPP; | |
5402 | goto out; | |
5403 | } | |
5404 | ||
6d40c4a7 DT |
5405 | remid = le32_to_cpu(rl->rl_lkid); |
5406 | ||
4875647a DT |
5407 | /* In general we expect the rsb returned to be R_MASTER, but we don't |
5408 | have to require it. Recovery of masters on one node can overlap | |
5409 | recovery of locks on another node, so one node can send us MSTCPY | |
5410 | locks before we've made ourselves master of this rsb. We can still | |
5411 | add new MSTCPY locks that we receive here without any harm; when | |
5412 | we make ourselves master, dlm_recover_masters() won't touch the | |
5413 | MSTCPY locks we've received early. */ | |
5414 | ||
c04fecb4 DT |
5415 | error = find_rsb(ls, rl->rl_name, le16_to_cpu(rl->rl_namelen), |
5416 | from_nodeid, R_RECEIVE_RECOVER, &r); | |
e7fd4179 DT |
5417 | if (error) |
5418 | goto out; | |
5419 | ||
c04fecb4 DT |
5420 | lock_rsb(r); |
5421 | ||
4875647a DT |
5422 | if (dlm_no_directory(ls) && (dlm_dir_nodeid(r) != dlm_our_nodeid())) { |
5423 | log_error(ls, "dlm_recover_master_copy remote %d %x not dir", | |
c04fecb4 | 5424 | from_nodeid, remid); |
4875647a | 5425 | error = -EBADR; |
c04fecb4 | 5426 | goto out_unlock; |
4875647a DT |
5427 | } |
5428 | ||
c04fecb4 | 5429 | lkb = search_remid(r, from_nodeid, remid); |
e7fd4179 DT |
5430 | if (lkb) { |
5431 | error = -EEXIST; | |
5432 | goto out_remid; | |
5433 | } | |
5434 | ||
5435 | error = create_lkb(ls, &lkb); | |
5436 | if (error) | |
5437 | goto out_unlock; | |
5438 | ||
5439 | error = receive_rcom_lock_args(ls, lkb, r, rc); | |
5440 | if (error) { | |
b3f58d8f | 5441 | __put_lkb(ls, lkb); |
e7fd4179 DT |
5442 | goto out_unlock; |
5443 | } | |
5444 | ||
5445 | attach_lkb(r, lkb); | |
5446 | add_lkb(r, lkb, rl->rl_status); | |
4875647a DT |
5447 | ls->ls_recover_locks_in++; |
5448 | ||
5449 | if (!list_empty(&r->res_waitqueue) || !list_empty(&r->res_convertqueue)) | |
5450 | rsb_set_flag(r, RSB_RECOVER_GRANT); | |
e7fd4179 DT |
5451 | |
5452 | out_remid: | |
5453 | /* this is the new value returned to the lock holder for | |
5454 | saving in its process-copy lkb */ | |
163a1859 | 5455 | rl->rl_remid = cpu_to_le32(lkb->lkb_id); |
e7fd4179 | 5456 | |
4875647a DT |
5457 | lkb->lkb_recover_seq = ls->ls_recover_seq; |
5458 | ||
e7fd4179 DT |
5459 | out_unlock: |
5460 | unlock_rsb(r); | |
5461 | put_rsb(r); | |
5462 | out: | |
6d40c4a7 | 5463 | if (error && error != -EEXIST) |
075f0177 | 5464 | log_rinfo(ls, "dlm_recover_master_copy remote %d %x error %d", |
c04fecb4 | 5465 | from_nodeid, remid, error); |
163a1859 | 5466 | rl->rl_result = cpu_to_le32(error); |
e7fd4179 DT |
5467 | return error; |
5468 | } | |
5469 | ||
ae773d0b | 5470 | /* needs at least dlm_rcom + rcom_lock */ |
e7fd4179 DT |
5471 | int dlm_recover_process_copy(struct dlm_ls *ls, struct dlm_rcom *rc) |
5472 | { | |
5473 | struct rcom_lock *rl = (struct rcom_lock *) rc->rc_buf; | |
5474 | struct dlm_rsb *r; | |
5475 | struct dlm_lkb *lkb; | |
6d40c4a7 DT |
5476 | uint32_t lkid, remid; |
5477 | int error, result; | |
5478 | ||
5479 | lkid = le32_to_cpu(rl->rl_lkid); | |
5480 | remid = le32_to_cpu(rl->rl_remid); | |
5481 | result = le32_to_cpu(rl->rl_result); | |
e7fd4179 | 5482 | |
6d40c4a7 | 5483 | error = find_lkb(ls, lkid, &lkb); |
e7fd4179 | 5484 | if (error) { |
6d40c4a7 | 5485 | log_error(ls, "dlm_recover_process_copy no %x remote %d %x %d", |
3428785a AA |
5486 | lkid, le32_to_cpu(rc->rc_header.h_nodeid), remid, |
5487 | result); | |
e7fd4179 DT |
5488 | return error; |
5489 | } | |
5490 | ||
4875647a DT |
5491 | r = lkb->lkb_resource; |
5492 | hold_rsb(r); | |
5493 | lock_rsb(r); | |
5494 | ||
6d40c4a7 DT |
5495 | if (!is_process_copy(lkb)) { |
5496 | log_error(ls, "dlm_recover_process_copy bad %x remote %d %x %d", | |
3428785a AA |
5497 | lkid, le32_to_cpu(rc->rc_header.h_nodeid), remid, |
5498 | result); | |
4875647a DT |
5499 | dlm_dump_rsb(r); |
5500 | unlock_rsb(r); | |
5501 | put_rsb(r); | |
5502 | dlm_put_lkb(lkb); | |
6d40c4a7 DT |
5503 | return -EINVAL; |
5504 | } | |
e7fd4179 | 5505 | |
6d40c4a7 | 5506 | switch (result) { |
dc200a88 DT |
5507 | case -EBADR: |
5508 | /* There's a chance the new master received our lock before | |
5509 | dlm_recover_master_reply(), this wouldn't happen if we did | |
5510 | a barrier between recover_masters and recover_locks. */ | |
6d40c4a7 DT |
5511 | |
5512 | log_debug(ls, "dlm_recover_process_copy %x remote %d %x %d", | |
3428785a AA |
5513 | lkid, le32_to_cpu(rc->rc_header.h_nodeid), remid, |
5514 | result); | |
6d40c4a7 | 5515 | |
dc200a88 DT |
5516 | dlm_send_rcom_lock(r, lkb); |
5517 | goto out; | |
e7fd4179 | 5518 | case -EEXIST: |
e7fd4179 | 5519 | case 0: |
6d40c4a7 | 5520 | lkb->lkb_remid = remid; |
e7fd4179 DT |
5521 | break; |
5522 | default: | |
6d40c4a7 | 5523 | log_error(ls, "dlm_recover_process_copy %x remote %d %x %d unk", |
3428785a AA |
5524 | lkid, le32_to_cpu(rc->rc_header.h_nodeid), remid, |
5525 | result); | |
e7fd4179 DT |
5526 | } |
5527 | ||
5528 | /* an ack for dlm_recover_locks() which waits for replies from | |
5529 | all the locks it sends to new masters */ | |
5530 | dlm_recovered_lock(r); | |
dc200a88 | 5531 | out: |
e7fd4179 DT |
5532 | unlock_rsb(r); |
5533 | put_rsb(r); | |
b3f58d8f | 5534 | dlm_put_lkb(lkb); |
e7fd4179 DT |
5535 | |
5536 | return 0; | |
5537 | } | |
5538 | ||
6b0afc0c AA |
5539 | int dlm_user_request(struct dlm_ls *ls, struct dlm_user_args *ua, |
5540 | int mode, uint32_t flags, void *name, unsigned int namelen) | |
597d0cae DT |
5541 | { |
5542 | struct dlm_lkb *lkb; | |
5543 | struct dlm_args args; | |
3b761030 | 5544 | bool do_put = true; |
597d0cae DT |
5545 | int error; |
5546 | ||
85e86edf | 5547 | dlm_lock_recovery(ls); |
597d0cae DT |
5548 | |
5549 | error = create_lkb(ls, &lkb); | |
5550 | if (error) { | |
5551 | kfree(ua); | |
5552 | goto out; | |
5553 | } | |
5554 | ||
7a3de732 AA |
5555 | trace_dlm_lock_start(ls, lkb, name, namelen, mode, flags); |
5556 | ||
597d0cae | 5557 | if (flags & DLM_LKF_VALBLK) { |
573c24c4 | 5558 | ua->lksb.sb_lvbptr = kzalloc(DLM_USER_LVB_LEN, GFP_NOFS); |
597d0cae DT |
5559 | if (!ua->lksb.sb_lvbptr) { |
5560 | kfree(ua); | |
597d0cae | 5561 | error = -ENOMEM; |
3b761030 | 5562 | goto out_put; |
597d0cae DT |
5563 | } |
5564 | } | |
6b0afc0c AA |
5565 | error = set_lock_args(mode, &ua->lksb, flags, namelen, fake_astfn, ua, |
5566 | fake_bastfn, &args); | |
597d0cae | 5567 | if (error) { |
d47b41ac VA |
5568 | kfree(ua->lksb.sb_lvbptr); |
5569 | ua->lksb.sb_lvbptr = NULL; | |
5570 | kfree(ua); | |
3b761030 | 5571 | goto out_put; |
597d0cae DT |
5572 | } |
5573 | ||
d47b41ac | 5574 | /* After ua is attached to lkb it will be freed by dlm_free_lkb(). |
8a39dcd9 | 5575 | When DLM_DFL_USER_BIT is set, the dlm knows that this is a userspace |
d47b41ac | 5576 | lock and that lkb_astparam is the dlm_user_args structure. */ |
8a39dcd9 | 5577 | set_bit(DLM_DFL_USER_BIT, &lkb->lkb_dflags); |
597d0cae DT |
5578 | error = request_lock(ls, lkb, name, namelen, &args); |
5579 | ||
5580 | switch (error) { | |
5581 | case 0: | |
5582 | break; | |
5583 | case -EINPROGRESS: | |
5584 | error = 0; | |
5585 | break; | |
5586 | case -EAGAIN: | |
5587 | error = 0; | |
df561f66 | 5588 | fallthrough; |
597d0cae | 5589 | default: |
3b761030 | 5590 | goto out_put; |
597d0cae DT |
5591 | } |
5592 | ||
5593 | /* add this new lkb to the per-process list of locks */ | |
5594 | spin_lock(&ua->proc->locks_spin); | |
ef0c2bb0 | 5595 | hold_lkb(lkb); |
597d0cae DT |
5596 | list_add_tail(&lkb->lkb_ownqueue, &ua->proc->locks); |
5597 | spin_unlock(&ua->proc->locks_spin); | |
3b761030 AA |
5598 | do_put = false; |
5599 | out_put: | |
7a3de732 | 5600 | trace_dlm_lock_end(ls, lkb, name, namelen, mode, flags, error, false); |
3b761030 AA |
5601 | if (do_put) |
5602 | __put_lkb(ls, lkb); | |
597d0cae | 5603 | out: |
85e86edf | 5604 | dlm_unlock_recovery(ls); |
597d0cae DT |
5605 | return error; |
5606 | } | |
5607 | ||
6b0afc0c AA |
5608 | int dlm_user_convert(struct dlm_ls *ls, struct dlm_user_args *ua_tmp, |
5609 | int mode, uint32_t flags, uint32_t lkid, char *lvb_in) | |
597d0cae DT |
5610 | { |
5611 | struct dlm_lkb *lkb; | |
5612 | struct dlm_args args; | |
5613 | struct dlm_user_args *ua; | |
5614 | int error; | |
5615 | ||
85e86edf | 5616 | dlm_lock_recovery(ls); |
597d0cae DT |
5617 | |
5618 | error = find_lkb(ls, lkid, &lkb); | |
5619 | if (error) | |
5620 | goto out; | |
5621 | ||
7a3de732 AA |
5622 | trace_dlm_lock_start(ls, lkb, NULL, 0, mode, flags); |
5623 | ||
597d0cae DT |
5624 | /* user can change the params on its lock when it converts it, or |
5625 | add an lvb that didn't exist before */ | |
5626 | ||
d292c0cc | 5627 | ua = lkb->lkb_ua; |
597d0cae DT |
5628 | |
5629 | if (flags & DLM_LKF_VALBLK && !ua->lksb.sb_lvbptr) { | |
573c24c4 | 5630 | ua->lksb.sb_lvbptr = kzalloc(DLM_USER_LVB_LEN, GFP_NOFS); |
597d0cae DT |
5631 | if (!ua->lksb.sb_lvbptr) { |
5632 | error = -ENOMEM; | |
5633 | goto out_put; | |
5634 | } | |
5635 | } | |
5636 | if (lvb_in && ua->lksb.sb_lvbptr) | |
5637 | memcpy(ua->lksb.sb_lvbptr, lvb_in, DLM_USER_LVB_LEN); | |
5638 | ||
d7db923e | 5639 | ua->xid = ua_tmp->xid; |
597d0cae DT |
5640 | ua->castparam = ua_tmp->castparam; |
5641 | ua->castaddr = ua_tmp->castaddr; | |
5642 | ua->bastparam = ua_tmp->bastparam; | |
5643 | ua->bastaddr = ua_tmp->bastaddr; | |
10948eb4 | 5644 | ua->user_lksb = ua_tmp->user_lksb; |
597d0cae | 5645 | |
6b0afc0c AA |
5646 | error = set_lock_args(mode, &ua->lksb, flags, 0, fake_astfn, ua, |
5647 | fake_bastfn, &args); | |
597d0cae DT |
5648 | if (error) |
5649 | goto out_put; | |
5650 | ||
5651 | error = convert_lock(ls, lkb, &args); | |
5652 | ||
c85d65e9 | 5653 | if (error == -EINPROGRESS || error == -EAGAIN || error == -EDEADLK) |
597d0cae DT |
5654 | error = 0; |
5655 | out_put: | |
7a3de732 | 5656 | trace_dlm_lock_end(ls, lkb, NULL, 0, mode, flags, error, false); |
597d0cae DT |
5657 | dlm_put_lkb(lkb); |
5658 | out: | |
85e86edf | 5659 | dlm_unlock_recovery(ls); |
597d0cae DT |
5660 | kfree(ua_tmp); |
5661 | return error; | |
5662 | } | |
5663 | ||
2ab4bd8e DT |
5664 | /* |
5665 | * The caller asks for an orphan lock on a given resource with a given mode. | |
5666 | * If a matching lock exists, it's moved to the owner's list of locks and | |
5667 | * the lkid is returned. | |
5668 | */ | |
5669 | ||
5670 | int dlm_user_adopt_orphan(struct dlm_ls *ls, struct dlm_user_args *ua_tmp, | |
5671 | int mode, uint32_t flags, void *name, unsigned int namelen, | |
8d614a44 | 5672 | uint32_t *lkid) |
2ab4bd8e | 5673 | { |
dc1acd5c | 5674 | struct dlm_lkb *lkb = NULL, *iter; |
2ab4bd8e DT |
5675 | struct dlm_user_args *ua; |
5676 | int found_other_mode = 0; | |
2ab4bd8e DT |
5677 | int rv = 0; |
5678 | ||
5679 | mutex_lock(&ls->ls_orphans_mutex); | |
dc1acd5c JK |
5680 | list_for_each_entry(iter, &ls->ls_orphans, lkb_ownqueue) { |
5681 | if (iter->lkb_resource->res_length != namelen) | |
2ab4bd8e | 5682 | continue; |
dc1acd5c | 5683 | if (memcmp(iter->lkb_resource->res_name, name, namelen)) |
2ab4bd8e | 5684 | continue; |
dc1acd5c | 5685 | if (iter->lkb_grmode != mode) { |
2ab4bd8e DT |
5686 | found_other_mode = 1; |
5687 | continue; | |
5688 | } | |
5689 | ||
dc1acd5c JK |
5690 | lkb = iter; |
5691 | list_del_init(&iter->lkb_ownqueue); | |
8a39dcd9 | 5692 | clear_bit(DLM_DFL_ORPHAN_BIT, &iter->lkb_dflags); |
dc1acd5c | 5693 | *lkid = iter->lkb_id; |
2ab4bd8e DT |
5694 | break; |
5695 | } | |
5696 | mutex_unlock(&ls->ls_orphans_mutex); | |
5697 | ||
dc1acd5c | 5698 | if (!lkb && found_other_mode) { |
2ab4bd8e DT |
5699 | rv = -EAGAIN; |
5700 | goto out; | |
5701 | } | |
5702 | ||
dc1acd5c | 5703 | if (!lkb) { |
2ab4bd8e DT |
5704 | rv = -ENOENT; |
5705 | goto out; | |
5706 | } | |
5707 | ||
5708 | lkb->lkb_exflags = flags; | |
5709 | lkb->lkb_ownpid = (int) current->pid; | |
5710 | ||
5711 | ua = lkb->lkb_ua; | |
5712 | ||
5713 | ua->proc = ua_tmp->proc; | |
5714 | ua->xid = ua_tmp->xid; | |
5715 | ua->castparam = ua_tmp->castparam; | |
5716 | ua->castaddr = ua_tmp->castaddr; | |
5717 | ua->bastparam = ua_tmp->bastparam; | |
5718 | ua->bastaddr = ua_tmp->bastaddr; | |
5719 | ua->user_lksb = ua_tmp->user_lksb; | |
5720 | ||
5721 | /* | |
5722 | * The lkb reference from the ls_orphans list was not | |
5723 | * removed above, and is now considered the reference | |
5724 | * for the proc locks list. | |
5725 | */ | |
5726 | ||
5727 | spin_lock(&ua->proc->locks_spin); | |
5728 | list_add_tail(&lkb->lkb_ownqueue, &ua->proc->locks); | |
5729 | spin_unlock(&ua->proc->locks_spin); | |
5730 | out: | |
5731 | kfree(ua_tmp); | |
5732 | return rv; | |
5733 | } | |
5734 | ||
597d0cae DT |
5735 | int dlm_user_unlock(struct dlm_ls *ls, struct dlm_user_args *ua_tmp, |
5736 | uint32_t flags, uint32_t lkid, char *lvb_in) | |
5737 | { | |
5738 | struct dlm_lkb *lkb; | |
5739 | struct dlm_args args; | |
5740 | struct dlm_user_args *ua; | |
5741 | int error; | |
5742 | ||
85e86edf | 5743 | dlm_lock_recovery(ls); |
597d0cae DT |
5744 | |
5745 | error = find_lkb(ls, lkid, &lkb); | |
5746 | if (error) | |
5747 | goto out; | |
5748 | ||
7a3de732 AA |
5749 | trace_dlm_unlock_start(ls, lkb, flags); |
5750 | ||
d292c0cc | 5751 | ua = lkb->lkb_ua; |
597d0cae DT |
5752 | |
5753 | if (lvb_in && ua->lksb.sb_lvbptr) | |
5754 | memcpy(ua->lksb.sb_lvbptr, lvb_in, DLM_USER_LVB_LEN); | |
b434eda6 PC |
5755 | if (ua_tmp->castparam) |
5756 | ua->castparam = ua_tmp->castparam; | |
cc346d55 | 5757 | ua->user_lksb = ua_tmp->user_lksb; |
597d0cae DT |
5758 | |
5759 | error = set_unlock_args(flags, ua, &args); | |
5760 | if (error) | |
5761 | goto out_put; | |
5762 | ||
5763 | error = unlock_lock(ls, lkb, &args); | |
5764 | ||
5765 | if (error == -DLM_EUNLOCK) | |
5766 | error = 0; | |
ef0c2bb0 DT |
5767 | /* from validate_unlock_args() */ |
5768 | if (error == -EBUSY && (flags & DLM_LKF_FORCEUNLOCK)) | |
5769 | error = 0; | |
597d0cae DT |
5770 | if (error) |
5771 | goto out_put; | |
5772 | ||
5773 | spin_lock(&ua->proc->locks_spin); | |
23e8e1aa | 5774 | /* dlm_user_add_cb() may have already taken lkb off the proc list */ |
a1bc86e6 DT |
5775 | if (!list_empty(&lkb->lkb_ownqueue)) |
5776 | list_move(&lkb->lkb_ownqueue, &ua->proc->unlocking); | |
597d0cae | 5777 | spin_unlock(&ua->proc->locks_spin); |
597d0cae | 5778 | out_put: |
7a3de732 | 5779 | trace_dlm_unlock_end(ls, lkb, flags, error); |
597d0cae DT |
5780 | dlm_put_lkb(lkb); |
5781 | out: | |
85e86edf | 5782 | dlm_unlock_recovery(ls); |
ef0c2bb0 | 5783 | kfree(ua_tmp); |
597d0cae DT |
5784 | return error; |
5785 | } | |
5786 | ||
5787 | int dlm_user_cancel(struct dlm_ls *ls, struct dlm_user_args *ua_tmp, | |
5788 | uint32_t flags, uint32_t lkid) | |
5789 | { | |
5790 | struct dlm_lkb *lkb; | |
5791 | struct dlm_args args; | |
5792 | struct dlm_user_args *ua; | |
5793 | int error; | |
5794 | ||
85e86edf | 5795 | dlm_lock_recovery(ls); |
597d0cae DT |
5796 | |
5797 | error = find_lkb(ls, lkid, &lkb); | |
5798 | if (error) | |
5799 | goto out; | |
5800 | ||
7a3de732 AA |
5801 | trace_dlm_unlock_start(ls, lkb, flags); |
5802 | ||
d292c0cc | 5803 | ua = lkb->lkb_ua; |
b434eda6 PC |
5804 | if (ua_tmp->castparam) |
5805 | ua->castparam = ua_tmp->castparam; | |
c059f70e | 5806 | ua->user_lksb = ua_tmp->user_lksb; |
597d0cae DT |
5807 | |
5808 | error = set_unlock_args(flags, ua, &args); | |
5809 | if (error) | |
5810 | goto out_put; | |
5811 | ||
5812 | error = cancel_lock(ls, lkb, &args); | |
5813 | ||
5814 | if (error == -DLM_ECANCEL) | |
5815 | error = 0; | |
ef0c2bb0 DT |
5816 | /* from validate_unlock_args() */ |
5817 | if (error == -EBUSY) | |
5818 | error = 0; | |
597d0cae | 5819 | out_put: |
7a3de732 | 5820 | trace_dlm_unlock_end(ls, lkb, flags, error); |
597d0cae DT |
5821 | dlm_put_lkb(lkb); |
5822 | out: | |
85e86edf | 5823 | dlm_unlock_recovery(ls); |
ef0c2bb0 | 5824 | kfree(ua_tmp); |
597d0cae DT |
5825 | return error; |
5826 | } | |
5827 | ||
8b4021fa DT |
5828 | int dlm_user_deadlock(struct dlm_ls *ls, uint32_t flags, uint32_t lkid) |
5829 | { | |
5830 | struct dlm_lkb *lkb; | |
5831 | struct dlm_args args; | |
5832 | struct dlm_user_args *ua; | |
5833 | struct dlm_rsb *r; | |
5834 | int error; | |
5835 | ||
5836 | dlm_lock_recovery(ls); | |
5837 | ||
5838 | error = find_lkb(ls, lkid, &lkb); | |
5839 | if (error) | |
5840 | goto out; | |
5841 | ||
7a3de732 AA |
5842 | trace_dlm_unlock_start(ls, lkb, flags); |
5843 | ||
d292c0cc | 5844 | ua = lkb->lkb_ua; |
8b4021fa DT |
5845 | |
5846 | error = set_unlock_args(flags, ua, &args); | |
5847 | if (error) | |
5848 | goto out_put; | |
5849 | ||
5850 | /* same as cancel_lock(), but set DEADLOCK_CANCEL after lock_rsb */ | |
5851 | ||
5852 | r = lkb->lkb_resource; | |
5853 | hold_rsb(r); | |
5854 | lock_rsb(r); | |
5855 | ||
5856 | error = validate_unlock_args(lkb, &args); | |
5857 | if (error) | |
5858 | goto out_r; | |
e1af8728 | 5859 | set_bit(DLM_IFL_DEADLOCK_CANCEL_BIT, &lkb->lkb_iflags); |
8b4021fa DT |
5860 | |
5861 | error = _cancel_lock(r, lkb); | |
5862 | out_r: | |
5863 | unlock_rsb(r); | |
5864 | put_rsb(r); | |
5865 | ||
5866 | if (error == -DLM_ECANCEL) | |
5867 | error = 0; | |
5868 | /* from validate_unlock_args() */ | |
5869 | if (error == -EBUSY) | |
5870 | error = 0; | |
5871 | out_put: | |
7a3de732 | 5872 | trace_dlm_unlock_end(ls, lkb, flags, error); |
8b4021fa DT |
5873 | dlm_put_lkb(lkb); |
5874 | out: | |
5875 | dlm_unlock_recovery(ls); | |
5876 | return error; | |
5877 | } | |
5878 | ||
ef0c2bb0 DT |
5879 | /* lkb's that are removed from the waiters list by revert are just left on the |
5880 | orphans list with the granted orphan locks, to be freed by purge */ | |
5881 | ||
597d0cae DT |
5882 | static int orphan_proc_lock(struct dlm_ls *ls, struct dlm_lkb *lkb) |
5883 | { | |
ef0c2bb0 DT |
5884 | struct dlm_args args; |
5885 | int error; | |
597d0cae | 5886 | |
2ab4bd8e | 5887 | hold_lkb(lkb); /* reference for the ls_orphans list */ |
ef0c2bb0 DT |
5888 | mutex_lock(&ls->ls_orphans_mutex); |
5889 | list_add_tail(&lkb->lkb_ownqueue, &ls->ls_orphans); | |
5890 | mutex_unlock(&ls->ls_orphans_mutex); | |
597d0cae | 5891 | |
d292c0cc | 5892 | set_unlock_args(0, lkb->lkb_ua, &args); |
ef0c2bb0 DT |
5893 | |
5894 | error = cancel_lock(ls, lkb, &args); | |
5895 | if (error == -DLM_ECANCEL) | |
5896 | error = 0; | |
5897 | return error; | |
597d0cae DT |
5898 | } |
5899 | ||
da8c6663 DT |
5900 | /* The FORCEUNLOCK flag allows the unlock to go ahead even if the lkb isn't |
5901 | granted. Regardless of what rsb queue the lock is on, it's removed and | |
5902 | freed. The IVVALBLK flag causes the lvb on the resource to be invalidated | |
5903 | if our lock is PW/EX (it's ignored if our granted mode is smaller.) */ | |
597d0cae DT |
5904 | |
5905 | static int unlock_proc_lock(struct dlm_ls *ls, struct dlm_lkb *lkb) | |
5906 | { | |
597d0cae DT |
5907 | struct dlm_args args; |
5908 | int error; | |
5909 | ||
da8c6663 DT |
5910 | set_unlock_args(DLM_LKF_FORCEUNLOCK | DLM_LKF_IVVALBLK, |
5911 | lkb->lkb_ua, &args); | |
597d0cae DT |
5912 | |
5913 | error = unlock_lock(ls, lkb, &args); | |
5914 | if (error == -DLM_EUNLOCK) | |
5915 | error = 0; | |
5916 | return error; | |
5917 | } | |
5918 | ||
ef0c2bb0 DT |
5919 | /* We have to release clear_proc_locks mutex before calling unlock_proc_lock() |
5920 | (which does lock_rsb) due to deadlock with receiving a message that does | |
23e8e1aa | 5921 | lock_rsb followed by dlm_user_add_cb() */ |
ef0c2bb0 DT |
5922 | |
5923 | static struct dlm_lkb *del_proc_lock(struct dlm_ls *ls, | |
5924 | struct dlm_user_proc *proc) | |
5925 | { | |
5926 | struct dlm_lkb *lkb = NULL; | |
5927 | ||
296d9d1e | 5928 | spin_lock(&ls->ls_clear_proc_locks); |
ef0c2bb0 DT |
5929 | if (list_empty(&proc->locks)) |
5930 | goto out; | |
5931 | ||
5932 | lkb = list_entry(proc->locks.next, struct dlm_lkb, lkb_ownqueue); | |
5933 | list_del_init(&lkb->lkb_ownqueue); | |
5934 | ||
5935 | if (lkb->lkb_exflags & DLM_LKF_PERSISTENT) | |
8a39dcd9 | 5936 | set_bit(DLM_DFL_ORPHAN_BIT, &lkb->lkb_dflags); |
ef0c2bb0 | 5937 | else |
e1af8728 | 5938 | set_bit(DLM_IFL_DEAD_BIT, &lkb->lkb_iflags); |
ef0c2bb0 | 5939 | out: |
296d9d1e | 5940 | spin_unlock(&ls->ls_clear_proc_locks); |
ef0c2bb0 DT |
5941 | return lkb; |
5942 | } | |
5943 | ||
23e8e1aa | 5944 | /* The ls_clear_proc_locks mutex protects against dlm_user_add_cb() which |
597d0cae DT |
5945 | 1) references lkb->ua which we free here and 2) adds lkbs to proc->asts, |
5946 | which we clear here. */ | |
5947 | ||
5948 | /* proc CLOSING flag is set so no more device_reads should look at proc->asts | |
5949 | list, and no more device_writes should add lkb's to proc->locks list; so we | |
5950 | shouldn't need to take asts_spin or locks_spin here. this assumes that | |
5951 | device reads/writes/closes are serialized -- FIXME: we may need to serialize | |
5952 | them ourself. */ | |
5953 | ||
5954 | void dlm_clear_proc_locks(struct dlm_ls *ls, struct dlm_user_proc *proc) | |
5955 | { | |
5956 | struct dlm_lkb *lkb, *safe; | |
5957 | ||
85e86edf | 5958 | dlm_lock_recovery(ls); |
597d0cae | 5959 | |
ef0c2bb0 DT |
5960 | while (1) { |
5961 | lkb = del_proc_lock(ls, proc); | |
5962 | if (!lkb) | |
5963 | break; | |
5964 | if (lkb->lkb_exflags & DLM_LKF_PERSISTENT) | |
597d0cae | 5965 | orphan_proc_lock(ls, lkb); |
ef0c2bb0 | 5966 | else |
597d0cae | 5967 | unlock_proc_lock(ls, lkb); |
597d0cae DT |
5968 | |
5969 | /* this removes the reference for the proc->locks list | |
5970 | added by dlm_user_request, it may result in the lkb | |
5971 | being freed */ | |
5972 | ||
5973 | dlm_put_lkb(lkb); | |
5974 | } | |
a1bc86e6 | 5975 | |
296d9d1e | 5976 | spin_lock(&ls->ls_clear_proc_locks); |
ef0c2bb0 | 5977 | |
a1bc86e6 DT |
5978 | /* in-progress unlocks */ |
5979 | list_for_each_entry_safe(lkb, safe, &proc->unlocking, lkb_ownqueue) { | |
5980 | list_del_init(&lkb->lkb_ownqueue); | |
e1af8728 | 5981 | set_bit(DLM_IFL_DEAD_BIT, &lkb->lkb_iflags); |
a1bc86e6 DT |
5982 | dlm_put_lkb(lkb); |
5983 | } | |
5984 | ||
23e8e1aa | 5985 | list_for_each_entry_safe(lkb, safe, &proc->asts, lkb_cb_list) { |
61bed0ba | 5986 | dlm_purge_lkb_callbacks(lkb); |
23e8e1aa | 5987 | list_del_init(&lkb->lkb_cb_list); |
a1bc86e6 DT |
5988 | dlm_put_lkb(lkb); |
5989 | } | |
5990 | ||
296d9d1e | 5991 | spin_unlock(&ls->ls_clear_proc_locks); |
85e86edf | 5992 | dlm_unlock_recovery(ls); |
597d0cae | 5993 | } |
a1bc86e6 | 5994 | |
8499137d DT |
5995 | static void purge_proc_locks(struct dlm_ls *ls, struct dlm_user_proc *proc) |
5996 | { | |
5997 | struct dlm_lkb *lkb, *safe; | |
5998 | ||
5999 | while (1) { | |
6000 | lkb = NULL; | |
6001 | spin_lock(&proc->locks_spin); | |
6002 | if (!list_empty(&proc->locks)) { | |
6003 | lkb = list_entry(proc->locks.next, struct dlm_lkb, | |
6004 | lkb_ownqueue); | |
6005 | list_del_init(&lkb->lkb_ownqueue); | |
6006 | } | |
6007 | spin_unlock(&proc->locks_spin); | |
6008 | ||
6009 | if (!lkb) | |
6010 | break; | |
6011 | ||
e1af8728 | 6012 | set_bit(DLM_IFL_DEAD_BIT, &lkb->lkb_iflags); |
8499137d DT |
6013 | unlock_proc_lock(ls, lkb); |
6014 | dlm_put_lkb(lkb); /* ref from proc->locks list */ | |
6015 | } | |
6016 | ||
6017 | spin_lock(&proc->locks_spin); | |
6018 | list_for_each_entry_safe(lkb, safe, &proc->unlocking, lkb_ownqueue) { | |
6019 | list_del_init(&lkb->lkb_ownqueue); | |
e1af8728 | 6020 | set_bit(DLM_IFL_DEAD_BIT, &lkb->lkb_iflags); |
8499137d DT |
6021 | dlm_put_lkb(lkb); |
6022 | } | |
6023 | spin_unlock(&proc->locks_spin); | |
6024 | ||
6025 | spin_lock(&proc->asts_spin); | |
23e8e1aa | 6026 | list_for_each_entry_safe(lkb, safe, &proc->asts, lkb_cb_list) { |
61bed0ba | 6027 | dlm_purge_lkb_callbacks(lkb); |
23e8e1aa | 6028 | list_del_init(&lkb->lkb_cb_list); |
8499137d DT |
6029 | dlm_put_lkb(lkb); |
6030 | } | |
6031 | spin_unlock(&proc->asts_spin); | |
6032 | } | |
6033 | ||
6034 | /* pid of 0 means purge all orphans */ | |
6035 | ||
6036 | static void do_purge(struct dlm_ls *ls, int nodeid, int pid) | |
6037 | { | |
6038 | struct dlm_lkb *lkb, *safe; | |
6039 | ||
6040 | mutex_lock(&ls->ls_orphans_mutex); | |
6041 | list_for_each_entry_safe(lkb, safe, &ls->ls_orphans, lkb_ownqueue) { | |
6042 | if (pid && lkb->lkb_ownpid != pid) | |
6043 | continue; | |
6044 | unlock_proc_lock(ls, lkb); | |
6045 | list_del_init(&lkb->lkb_ownqueue); | |
6046 | dlm_put_lkb(lkb); | |
6047 | } | |
6048 | mutex_unlock(&ls->ls_orphans_mutex); | |
6049 | } | |
6050 | ||
6051 | static int send_purge(struct dlm_ls *ls, int nodeid, int pid) | |
6052 | { | |
6053 | struct dlm_message *ms; | |
6054 | struct dlm_mhandle *mh; | |
6055 | int error; | |
6056 | ||
6057 | error = _create_message(ls, sizeof(struct dlm_message), nodeid, | |
e1711fe3 | 6058 | DLM_MSG_PURGE, &ms, &mh, GFP_NOFS); |
8499137d DT |
6059 | if (error) |
6060 | return error; | |
00e99ccd AA |
6061 | ms->m_nodeid = cpu_to_le32(nodeid); |
6062 | ms->m_pid = cpu_to_le32(pid); | |
8499137d | 6063 | |
e01c4b7b | 6064 | return send_message(mh, ms, NULL, 0); |
8499137d DT |
6065 | } |
6066 | ||
6067 | int dlm_user_purge(struct dlm_ls *ls, struct dlm_user_proc *proc, | |
6068 | int nodeid, int pid) | |
6069 | { | |
6070 | int error = 0; | |
6071 | ||
2ab4bd8e | 6072 | if (nodeid && (nodeid != dlm_our_nodeid())) { |
8499137d DT |
6073 | error = send_purge(ls, nodeid, pid); |
6074 | } else { | |
85e86edf | 6075 | dlm_lock_recovery(ls); |
8499137d DT |
6076 | if (pid == current->pid) |
6077 | purge_proc_locks(ls, proc); | |
6078 | else | |
6079 | do_purge(ls, nodeid, pid); | |
85e86edf | 6080 | dlm_unlock_recovery(ls); |
8499137d DT |
6081 | } |
6082 | return error; | |
6083 | } | |
6084 | ||
5054e79d AA |
6085 | /* debug functionality */ |
6086 | int dlm_debug_add_lkb(struct dlm_ls *ls, uint32_t lkb_id, char *name, int len, | |
8c11ba64 | 6087 | int lkb_nodeid, unsigned int lkb_dflags, int lkb_status) |
5054e79d AA |
6088 | { |
6089 | struct dlm_lksb *lksb; | |
6090 | struct dlm_lkb *lkb; | |
6091 | struct dlm_rsb *r; | |
6092 | int error; | |
6093 | ||
6094 | /* we currently can't set a valid user lock */ | |
8a39dcd9 | 6095 | if (lkb_dflags & BIT(DLM_DFL_USER_BIT)) |
5054e79d AA |
6096 | return -EOPNOTSUPP; |
6097 | ||
6098 | lksb = kzalloc(sizeof(*lksb), GFP_NOFS); | |
6099 | if (!lksb) | |
6100 | return -ENOMEM; | |
6101 | ||
6102 | error = _create_lkb(ls, &lkb, lkb_id, lkb_id + 1); | |
6103 | if (error) { | |
6104 | kfree(lksb); | |
6105 | return error; | |
6106 | } | |
6107 | ||
8a39dcd9 | 6108 | dlm_set_dflags_val(lkb, lkb_dflags); |
5054e79d AA |
6109 | lkb->lkb_nodeid = lkb_nodeid; |
6110 | lkb->lkb_lksb = lksb; | |
6111 | /* user specific pointer, just don't have it NULL for kernel locks */ | |
8a39dcd9 | 6112 | if (~lkb_dflags & BIT(DLM_DFL_USER_BIT)) |
5054e79d AA |
6113 | lkb->lkb_astparam = (void *)0xDEADBEEF; |
6114 | ||
6115 | error = find_rsb(ls, name, len, 0, R_REQUEST, &r); | |
6116 | if (error) { | |
6117 | kfree(lksb); | |
6118 | __put_lkb(ls, lkb); | |
6119 | return error; | |
6120 | } | |
6121 | ||
6122 | lock_rsb(r); | |
6123 | attach_lkb(r, lkb); | |
6124 | add_lkb(r, lkb, lkb_status); | |
6125 | unlock_rsb(r); | |
6126 | put_rsb(r); | |
6127 | ||
6128 | return 0; | |
6129 | } | |
6130 | ||
63eab2b0 AA |
6131 | int dlm_debug_add_lkb_to_waiters(struct dlm_ls *ls, uint32_t lkb_id, |
6132 | int mstype, int to_nodeid) | |
6133 | { | |
6134 | struct dlm_lkb *lkb; | |
6135 | int error; | |
6136 | ||
6137 | error = find_lkb(ls, lkb_id, &lkb); | |
6138 | if (error) | |
6139 | return error; | |
6140 | ||
6141 | error = add_to_waiters(lkb, mstype, to_nodeid); | |
6142 | dlm_put_lkb(lkb); | |
6143 | return error; | |
6144 | } | |
6145 |