Merge tag 'spi-fix-v6.8-merge-window' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6-block.git] / fs / dlm / rcom.c
CommitLineData
2522fe45 1// SPDX-License-Identifier: GPL-2.0-only
e7fd4179
DT
2/******************************************************************************
3*******************************************************************************
4**
5** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
dbcfc347 6** Copyright (C) 2005-2008 Red Hat, Inc. All rights reserved.
e7fd4179 7**
e7fd4179
DT
8**
9*******************************************************************************
10******************************************************************************/
11
12#include "dlm_internal.h"
13#include "lockspace.h"
14#include "member.h"
15#include "lowcomms.h"
16#include "midcomms.h"
17#include "rcom.h"
18#include "recover.h"
19#include "dir.h"
20#include "config.h"
21#include "memory.h"
22#include "lock.h"
23#include "util.h"
e7fd4179
DT
24
25static int rcom_response(struct dlm_ls *ls)
26{
27 return test_bit(LSFL_RCOM_READY, &ls->ls_flags);
28}
29
a070a91c 30static void _create_rcom(struct dlm_ls *ls, int to_nodeid, int type, int len,
c4f4e135
AA
31 struct dlm_rcom **rc_ret, char *mb, int mb_len,
32 uint64_t seq)
e7fd4179
DT
33{
34 struct dlm_rcom *rc;
e7fd4179
DT
35
36 rc = (struct dlm_rcom *) mb;
37
3428785a
AA
38 rc->rc_header.h_version = cpu_to_le32(DLM_HEADER_MAJOR | DLM_HEADER_MINOR);
39 rc->rc_header.u.h_lockspace = cpu_to_le32(ls->ls_global_id);
40 rc->rc_header.h_nodeid = cpu_to_le32(dlm_our_nodeid());
41 rc->rc_header.h_length = cpu_to_le16(mb_len);
e7fd4179
DT
42 rc->rc_header.h_cmd = DLM_RCOM;
43
2f9dbeda 44 rc->rc_type = cpu_to_le32(type);
c4f4e135 45 rc->rc_seq = cpu_to_le64(seq);
38aa8b0c 46
e7fd4179 47 *rc_ret = rc;
a070a91c
AA
48}
49
50static int create_rcom(struct dlm_ls *ls, int to_nodeid, int type, int len,
c4f4e135
AA
51 struct dlm_rcom **rc_ret, struct dlm_mhandle **mh_ret,
52 uint64_t seq)
a070a91c
AA
53{
54 int mb_len = sizeof(struct dlm_rcom) + len;
55 struct dlm_mhandle *mh;
56 char *mb;
57
58 mh = dlm_midcomms_get_mhandle(to_nodeid, mb_len, GFP_NOFS, &mb);
59 if (!mh) {
60 log_print("%s to %d type %d len %d ENOBUFS",
61 __func__, to_nodeid, type, len);
62 return -ENOBUFS;
63 }
64
c4f4e135 65 _create_rcom(ls, to_nodeid, type, len, rc_ret, mb, mb_len, seq);
a070a91c 66 *mh_ret = mh;
e7fd4179
DT
67 return 0;
68}
69
a070a91c
AA
70static int create_rcom_stateless(struct dlm_ls *ls, int to_nodeid, int type,
71 int len, struct dlm_rcom **rc_ret,
c4f4e135 72 struct dlm_msg **msg_ret, uint64_t seq)
a070a91c
AA
73{
74 int mb_len = sizeof(struct dlm_rcom) + len;
8f2dc78d 75 struct dlm_msg *msg;
a070a91c
AA
76 char *mb;
77
8f2dc78d
AA
78 msg = dlm_lowcomms_new_msg(to_nodeid, mb_len, GFP_NOFS, &mb,
79 NULL, NULL);
80 if (!msg) {
a070a91c
AA
81 log_print("create_rcom to %d type %d len %d ENOBUFS",
82 to_nodeid, type, len);
83 return -ENOBUFS;
84 }
85
c4f4e135 86 _create_rcom(ls, to_nodeid, type, len, rc_ret, mb, mb_len, seq);
8f2dc78d 87 *msg_ret = msg;
a070a91c
AA
88 return 0;
89}
90
88aa023a 91static void send_rcom(struct dlm_mhandle *mh, struct dlm_rcom *rc)
a070a91c 92{
e01c4b7b 93 dlm_midcomms_commit_mhandle(mh, NULL, 0);
a070a91c
AA
94}
95
88aa023a 96static void send_rcom_stateless(struct dlm_msg *msg, struct dlm_rcom *rc)
a070a91c 97{
8f2dc78d
AA
98 dlm_lowcomms_commit_msg(msg);
99 dlm_lowcomms_put_msg(msg);
e7fd4179
DT
100}
101
757a4271
DT
102static void set_rcom_status(struct dlm_ls *ls, struct rcom_status *rs,
103 uint32_t flags)
104{
105 rs->rs_flags = cpu_to_le32(flags);
106}
107
e7fd4179
DT
108/* When replying to a status request, a node also sends back its
109 configuration values. The requesting node then checks that the remote
110 node is configured the same way as itself. */
111
757a4271
DT
112static void set_rcom_config(struct dlm_ls *ls, struct rcom_config *rf,
113 uint32_t num_slots)
e7fd4179 114{
93ff2971
AV
115 rf->rf_lvblen = cpu_to_le32(ls->ls_lvblen);
116 rf->rf_lsflags = cpu_to_le32(ls->ls_exflags);
757a4271
DT
117
118 rf->rf_our_slot = cpu_to_le16(ls->ls_slot);
119 rf->rf_num_slots = cpu_to_le16(num_slots);
120 rf->rf_generation = cpu_to_le32(ls->ls_generation);
e7fd4179
DT
121}
122
757a4271 123static int check_rcom_config(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid)
e7fd4179 124{
9e971b71
DT
125 struct rcom_config *rf = (struct rcom_config *) rc->rc_buf;
126
3428785a 127 if ((le32_to_cpu(rc->rc_header.h_version) & 0xFFFF0000) != DLM_HEADER_MAJOR) {
9e971b71
DT
128 log_error(ls, "version mismatch: %x nodeid %d: %x",
129 DLM_HEADER_MAJOR | DLM_HEADER_MINOR, nodeid,
3428785a 130 le32_to_cpu(rc->rc_header.h_version));
8b0e7b2c 131 return -EPROTO;
9e971b71
DT
132 }
133
93ff2971
AV
134 if (le32_to_cpu(rf->rf_lvblen) != ls->ls_lvblen ||
135 le32_to_cpu(rf->rf_lsflags) != ls->ls_exflags) {
e7fd4179 136 log_error(ls, "config mismatch: %d,%x nodeid %d: %d,%x",
93ff2971
AV
137 ls->ls_lvblen, ls->ls_exflags, nodeid,
138 le32_to_cpu(rf->rf_lvblen),
139 le32_to_cpu(rf->rf_lsflags));
8b0e7b2c 140 return -EPROTO;
e7fd4179
DT
141 }
142 return 0;
143}
144
2f9dbeda 145static void allow_sync_reply(struct dlm_ls *ls, __le64 *new_seq)
98f176fb
DT
146{
147 spin_lock(&ls->ls_rcom_spin);
2f9dbeda 148 *new_seq = cpu_to_le64(++ls->ls_rcom_seq);
98f176fb
DT
149 set_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
150 spin_unlock(&ls->ls_rcom_spin);
151}
152
153static void disallow_sync_reply(struct dlm_ls *ls)
154{
155 spin_lock(&ls->ls_rcom_spin);
156 clear_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
157 clear_bit(LSFL_RCOM_READY, &ls->ls_flags);
158 spin_unlock(&ls->ls_rcom_spin);
159}
160
757a4271
DT
161/*
162 * low nodeid gathers one slot value at a time from each node.
163 * it sets need_slots=0, and saves rf_our_slot returned from each
164 * rcom_config.
165 *
166 * other nodes gather all slot values at once from the low nodeid.
167 * they set need_slots=1, and ignore the rf_our_slot returned from each
168 * rcom_config. they use the rf_num_slots returned from the low
169 * node's rcom_config.
170 */
171
c4f4e135
AA
172int dlm_rcom_status(struct dlm_ls *ls, int nodeid, uint32_t status_flags,
173 uint64_t seq)
e7fd4179
DT
174{
175 struct dlm_rcom *rc;
8f2dc78d 176 struct dlm_msg *msg;
e7fd4179
DT
177 int error = 0;
178
faa0f267 179 ls->ls_recover_nodeid = nodeid;
e7fd4179
DT
180
181 if (nodeid == dlm_our_nodeid()) {
4007685c 182 rc = ls->ls_recover_buf;
2f9dbeda 183 rc->rc_result = cpu_to_le32(dlm_recover_status(ls));
e7fd4179
DT
184 goto out;
185 }
186
59661212 187retry:
a070a91c 188 error = create_rcom_stateless(ls, nodeid, DLM_RCOM_STATUS,
c4f4e135
AA
189 sizeof(struct rcom_status), &rc, &msg,
190 seq);
e7fd4179
DT
191 if (error)
192 goto out;
98f176fb 193
757a4271
DT
194 set_rcom_status(ls, (struct rcom_status *)rc->rc_buf, status_flags);
195
98f176fb 196 allow_sync_reply(ls, &rc->rc_id);
d10a0b88 197 memset(ls->ls_recover_buf, 0, DLM_MAX_SOCKET_BUFSIZE);
e7fd4179 198
88aa023a 199 send_rcom_stateless(msg, rc);
e7fd4179
DT
200
201 error = dlm_wait_function(ls, &rcom_response);
98f176fb 202 disallow_sync_reply(ls);
59661212 203 if (error == -ETIMEDOUT)
204 goto retry;
e7fd4179
DT
205 if (error)
206 goto out;
207
4007685c 208 rc = ls->ls_recover_buf;
e7fd4179 209
2f9dbeda 210 if (rc->rc_result == cpu_to_le32(-ESRCH)) {
e7fd4179
DT
211 /* we pretend the remote lockspace exists with 0 status */
212 log_debug(ls, "remote node %d not ready", nodeid);
213 rc->rc_result = 0;
757a4271
DT
214 error = 0;
215 } else {
216 error = check_rcom_config(ls, rc, nodeid);
217 }
218
e7fd4179
DT
219 /* the caller looks at rc_result for the remote recovery status */
220 out:
221 return error;
222}
223
11519351
AA
224static void receive_rcom_status(struct dlm_ls *ls,
225 const struct dlm_rcom *rc_in,
c4f4e135 226 uint64_t seq)
e7fd4179
DT
227{
228 struct dlm_rcom *rc;
757a4271
DT
229 struct rcom_status *rs;
230 uint32_t status;
3428785a 231 int nodeid = le32_to_cpu(rc_in->rc_header.h_nodeid);
757a4271 232 int len = sizeof(struct rcom_config);
8f2dc78d 233 struct dlm_msg *msg;
757a4271
DT
234 int num_slots = 0;
235 int error;
236
237 if (!dlm_slots_version(&rc_in->rc_header)) {
238 status = dlm_recover_status(ls);
239 goto do_create;
240 }
241
242 rs = (struct rcom_status *)rc_in->rc_buf;
e7fd4179 243
c07127b4 244 if (!(le32_to_cpu(rs->rs_flags) & DLM_RSF_NEED_SLOTS)) {
757a4271
DT
245 status = dlm_recover_status(ls);
246 goto do_create;
247 }
248
249 spin_lock(&ls->ls_recover_lock);
250 status = ls->ls_recover_status;
251 num_slots = ls->ls_num_slots;
252 spin_unlock(&ls->ls_recover_lock);
253 len += num_slots * sizeof(struct rcom_slot);
254
255 do_create:
a070a91c 256 error = create_rcom_stateless(ls, nodeid, DLM_RCOM_STATUS_REPLY,
c4f4e135 257 len, &rc, &msg, seq);
e7fd4179
DT
258 if (error)
259 return;
757a4271 260
4a99c3d9 261 rc->rc_id = rc_in->rc_id;
38aa8b0c 262 rc->rc_seq_reply = rc_in->rc_seq;
2f9dbeda 263 rc->rc_result = cpu_to_le32(status);
757a4271
DT
264
265 set_rcom_config(ls, (struct rcom_config *)rc->rc_buf, num_slots);
266
267 if (!num_slots)
268 goto do_send;
269
270 spin_lock(&ls->ls_recover_lock);
271 if (ls->ls_num_slots != num_slots) {
272 spin_unlock(&ls->ls_recover_lock);
273 log_debug(ls, "receive_rcom_status num_slots %d to %d",
274 num_slots, ls->ls_num_slots);
275 rc->rc_result = 0;
276 set_rcom_config(ls, (struct rcom_config *)rc->rc_buf, 0);
277 goto do_send;
278 }
279
280 dlm_slots_copy_out(ls, rc);
281 spin_unlock(&ls->ls_recover_lock);
e7fd4179 282
757a4271 283 do_send:
88aa023a 284 send_rcom_stateless(msg, rc);
e7fd4179
DT
285}
286
11519351 287static void receive_sync_reply(struct dlm_ls *ls, const struct dlm_rcom *rc_in)
e7fd4179 288{
98f176fb
DT
289 spin_lock(&ls->ls_rcom_spin);
290 if (!test_bit(LSFL_RCOM_WAIT, &ls->ls_flags) ||
2f9dbeda 291 le64_to_cpu(rc_in->rc_id) != ls->ls_rcom_seq) {
98f176fb 292 log_debug(ls, "reject reply %d from %d seq %llx expect %llx",
2f9dbeda 293 le32_to_cpu(rc_in->rc_type),
3428785a 294 le32_to_cpu(rc_in->rc_header.h_nodeid),
2f9dbeda 295 (unsigned long long)le64_to_cpu(rc_in->rc_id),
57adf7ee 296 (unsigned long long)ls->ls_rcom_seq);
98f176fb 297 goto out;
4a99c3d9 298 }
3428785a
AA
299 memcpy(ls->ls_recover_buf, rc_in,
300 le16_to_cpu(rc_in->rc_header.h_length));
e7fd4179 301 set_bit(LSFL_RCOM_READY, &ls->ls_flags);
98f176fb 302 clear_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
e7fd4179 303 wake_up(&ls->ls_wait_general);
98f176fb
DT
304 out:
305 spin_unlock(&ls->ls_rcom_spin);
e7fd4179
DT
306}
307
c4f4e135
AA
308int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name,
309 int last_len, uint64_t seq)
e7fd4179 310{
a3d85fcf 311 struct dlm_mhandle *mh;
e7fd4179 312 struct dlm_rcom *rc;
4007685c 313 int error = 0;
e7fd4179 314
faa0f267 315 ls->ls_recover_nodeid = nodeid;
e7fd4179 316
59661212 317retry:
a3d85fcf
AA
318 error = create_rcom(ls, nodeid, DLM_RCOM_NAMES, last_len,
319 &rc, &mh, seq);
e7fd4179
DT
320 if (error)
321 goto out;
322 memcpy(rc->rc_buf, last_name, last_len);
98f176fb
DT
323
324 allow_sync_reply(ls, &rc->rc_id);
d10a0b88 325 memset(ls->ls_recover_buf, 0, DLM_MAX_SOCKET_BUFSIZE);
e7fd4179 326
a3d85fcf 327 send_rcom(mh, rc);
e7fd4179
DT
328
329 error = dlm_wait_function(ls, &rcom_response);
98f176fb 330 disallow_sync_reply(ls);
59661212 331 if (error == -ETIMEDOUT)
332 goto retry;
e7fd4179
DT
333 out:
334 return error;
335}
336
11519351 337static void receive_rcom_names(struct dlm_ls *ls, const struct dlm_rcom *rc_in,
c4f4e135 338 uint64_t seq)
e7fd4179 339{
a3d85fcf 340 struct dlm_mhandle *mh;
e7fd4179 341 struct dlm_rcom *rc;
38aa8b0c 342 int error, inlen, outlen, nodeid;
e7fd4179 343
3428785a
AA
344 nodeid = le32_to_cpu(rc_in->rc_header.h_nodeid);
345 inlen = le16_to_cpu(rc_in->rc_header.h_length) -
346 sizeof(struct dlm_rcom);
d10a0b88 347 outlen = DLM_MAX_APP_BUFSIZE - sizeof(struct dlm_rcom);
e7fd4179 348
a3d85fcf
AA
349 error = create_rcom(ls, nodeid, DLM_RCOM_NAMES_REPLY, outlen,
350 &rc, &mh, seq);
e7fd4179
DT
351 if (error)
352 return;
4a99c3d9 353 rc->rc_id = rc_in->rc_id;
38aa8b0c 354 rc->rc_seq_reply = rc_in->rc_seq;
e7fd4179
DT
355
356 dlm_copy_master_names(ls, rc_in->rc_buf, inlen, rc->rc_buf, outlen,
357 nodeid);
a3d85fcf 358 send_rcom(mh, rc);
e7fd4179
DT
359}
360
c4f4e135 361int dlm_send_rcom_lookup(struct dlm_rsb *r, int dir_nodeid, uint64_t seq)
e7fd4179
DT
362{
363 struct dlm_rcom *rc;
364 struct dlm_mhandle *mh;
365 struct dlm_ls *ls = r->res_ls;
366 int error;
367
368 error = create_rcom(ls, dir_nodeid, DLM_RCOM_LOOKUP, r->res_length,
c4f4e135 369 &rc, &mh, seq);
e7fd4179
DT
370 if (error)
371 goto out;
372 memcpy(rc->rc_buf, r->res_name, r->res_length);
2f9dbeda 373 rc->rc_id = cpu_to_le64(r->res_id);
e7fd4179 374
88aa023a 375 send_rcom(mh, rc);
e7fd4179
DT
376 out:
377 return error;
378}
379
11519351
AA
380static void receive_rcom_lookup(struct dlm_ls *ls,
381 const struct dlm_rcom *rc_in, uint64_t seq)
e7fd4179
DT
382{
383 struct dlm_rcom *rc;
384 struct dlm_mhandle *mh;
3428785a
AA
385 int error, ret_nodeid, nodeid = le32_to_cpu(rc_in->rc_header.h_nodeid);
386 int len = le16_to_cpu(rc_in->rc_header.h_length) -
387 sizeof(struct dlm_rcom);
e7fd4179 388
9250e523 389 /* Old code would send this special id to trigger a debug dump. */
2f9dbeda 390 if (rc_in->rc_id == cpu_to_le64(0xFFFFFFFF)) {
c04fecb4
DT
391 log_error(ls, "receive_rcom_lookup dump from %d", nodeid);
392 dlm_dump_rsb_name(ls, rc_in->rc_buf, len);
393 return;
394 }
395
c4f4e135
AA
396 error = create_rcom(ls, nodeid, DLM_RCOM_LOOKUP_REPLY, 0, &rc, &mh,
397 seq);
f6089981
CIK
398 if (error)
399 return;
400
c04fecb4
DT
401 error = dlm_master_lookup(ls, nodeid, rc_in->rc_buf, len,
402 DLM_LU_RECOVER_MASTER, &ret_nodeid, NULL);
e7fd4179
DT
403 if (error)
404 ret_nodeid = error;
2f9dbeda 405 rc->rc_result = cpu_to_le32(ret_nodeid);
e7fd4179 406 rc->rc_id = rc_in->rc_id;
38aa8b0c 407 rc->rc_seq_reply = rc_in->rc_seq;
e7fd4179 408
88aa023a 409 send_rcom(mh, rc);
e7fd4179
DT
410}
411
11519351
AA
412static void receive_rcom_lookup_reply(struct dlm_ls *ls,
413 const struct dlm_rcom *rc_in)
e7fd4179
DT
414{
415 dlm_recover_master_reply(ls, rc_in);
416}
417
418static void pack_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb,
419 struct rcom_lock *rl)
420{
421 memset(rl, 0, sizeof(*rl));
422
163a1859
AV
423 rl->rl_ownpid = cpu_to_le32(lkb->lkb_ownpid);
424 rl->rl_lkid = cpu_to_le32(lkb->lkb_id);
425 rl->rl_exflags = cpu_to_le32(lkb->lkb_exflags);
8a39dcd9 426 rl->rl_flags = cpu_to_le32(dlm_dflags_val(lkb));
163a1859 427 rl->rl_lvbseq = cpu_to_le32(lkb->lkb_lvbseq);
e7fd4179
DT
428 rl->rl_rqmode = lkb->lkb_rqmode;
429 rl->rl_grmode = lkb->lkb_grmode;
430 rl->rl_status = lkb->lkb_status;
163a1859 431 rl->rl_wait_type = cpu_to_le16(lkb->lkb_wait_type);
e7fd4179 432
e5dae548 433 if (lkb->lkb_bastfn)
8304d6f2 434 rl->rl_asts |= DLM_CB_BAST;
e5dae548 435 if (lkb->lkb_astfn)
8304d6f2 436 rl->rl_asts |= DLM_CB_CAST;
e7fd4179 437
163a1859 438 rl->rl_namelen = cpu_to_le16(r->res_length);
e7fd4179
DT
439 memcpy(rl->rl_name, r->res_name, r->res_length);
440
441 /* FIXME: might we have an lvb without DLM_LKF_VALBLK set ?
442 If so, receive_rcom_lock_args() won't take this copy. */
443
444 if (lkb->lkb_lvbptr)
445 memcpy(rl->rl_lvb, lkb->lkb_lvbptr, r->res_ls->ls_lvblen);
446}
447
c4f4e135 448int dlm_send_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb, uint64_t seq)
e7fd4179
DT
449{
450 struct dlm_ls *ls = r->res_ls;
451 struct dlm_rcom *rc;
452 struct dlm_mhandle *mh;
453 struct rcom_lock *rl;
454 int error, len = sizeof(struct rcom_lock);
455
456 if (lkb->lkb_lvbptr)
457 len += ls->ls_lvblen;
458
c4f4e135
AA
459 error = create_rcom(ls, r->res_nodeid, DLM_RCOM_LOCK, len, &rc, &mh,
460 seq);
e7fd4179
DT
461 if (error)
462 goto out;
463
464 rl = (struct rcom_lock *) rc->rc_buf;
465 pack_rcom_lock(r, lkb, rl);
e425ac99 466 rc->rc_id = cpu_to_le64((uintptr_t)r);
e7fd4179 467
88aa023a 468 send_rcom(mh, rc);
e7fd4179
DT
469 out:
470 return error;
471}
472
ae773d0b 473/* needs at least dlm_rcom + rcom_lock */
11519351 474static void receive_rcom_lock(struct dlm_ls *ls, const struct dlm_rcom *rc_in,
c4f4e135 475 uint64_t seq)
e7fd4179 476{
b9d2f6ad
AA
477 __le32 rl_remid, rl_result;
478 struct rcom_lock *rl;
e7fd4179
DT
479 struct dlm_rcom *rc;
480 struct dlm_mhandle *mh;
3428785a 481 int error, nodeid = le32_to_cpu(rc_in->rc_header.h_nodeid);
e7fd4179 482
b9d2f6ad 483 dlm_recover_master_copy(ls, rc_in, &rl_remid, &rl_result);
e7fd4179
DT
484
485 error = create_rcom(ls, nodeid, DLM_RCOM_LOCK_REPLY,
c4f4e135 486 sizeof(struct rcom_lock), &rc, &mh, seq);
e7fd4179
DT
487 if (error)
488 return;
489
e7fd4179 490 memcpy(rc->rc_buf, rc_in->rc_buf, sizeof(struct rcom_lock));
b9d2f6ad
AA
491 rl = (struct rcom_lock *)rc->rc_buf;
492 /* set rl_remid and rl_result from dlm_recover_master_copy() */
493 rl->rl_remid = rl_remid;
494 rl->rl_result = rl_result;
495
e7fd4179 496 rc->rc_id = rc_in->rc_id;
38aa8b0c 497 rc->rc_seq_reply = rc_in->rc_seq;
e7fd4179 498
88aa023a 499 send_rcom(mh, rc);
e7fd4179
DT
500}
501
c36258b5
DT
502/* If the lockspace doesn't exist then still send a status message
503 back; it's possible that it just doesn't have its global_id yet. */
504
11519351 505int dlm_send_ls_not_ready(int nodeid, const struct dlm_rcom *rc_in)
e7fd4179
DT
506{
507 struct dlm_rcom *rc;
1babdb45 508 struct rcom_config *rf;
e7fd4179
DT
509 struct dlm_mhandle *mh;
510 char *mb;
1babdb45 511 int mb_len = sizeof(struct dlm_rcom) + sizeof(struct rcom_config);
e7fd4179 512
a070a91c 513 mh = dlm_midcomms_get_mhandle(nodeid, mb_len, GFP_NOFS, &mb);
e7fd4179
DT
514 if (!mh)
515 return -ENOBUFS;
e7fd4179
DT
516
517 rc = (struct dlm_rcom *) mb;
518
3428785a 519 rc->rc_header.h_version = cpu_to_le32(DLM_HEADER_MAJOR | DLM_HEADER_MINOR);
8e2e4086 520 rc->rc_header.u.h_lockspace = rc_in->rc_header.u.h_lockspace;
3428785a
AA
521 rc->rc_header.h_nodeid = cpu_to_le32(dlm_our_nodeid());
522 rc->rc_header.h_length = cpu_to_le16(mb_len);
e7fd4179
DT
523 rc->rc_header.h_cmd = DLM_RCOM;
524
2f9dbeda 525 rc->rc_type = cpu_to_le32(DLM_RCOM_STATUS_REPLY);
f5888750 526 rc->rc_id = rc_in->rc_id;
38aa8b0c 527 rc->rc_seq_reply = rc_in->rc_seq;
2f9dbeda 528 rc->rc_result = cpu_to_le32(-ESRCH);
e7fd4179 529
1babdb45 530 rf = (struct rcom_config *) rc->rc_buf;
93ff2971 531 rf->rf_lvblen = cpu_to_le32(~0U);
1babdb45 532
e01c4b7b 533 dlm_midcomms_commit_mhandle(mh, NULL, 0);
e7fd4179
DT
534
535 return 0;
536}
537
c04fecb4
DT
538/*
539 * Ignore messages for stage Y before we set
540 * recover_status bit for stage X:
541 *
542 * recover_status = 0
543 *
544 * dlm_recover_members()
545 * - send nothing
546 * - recv nothing
547 * - ignore NAMES, NAMES_REPLY
548 * - ignore LOOKUP, LOOKUP_REPLY
549 * - ignore LOCK, LOCK_REPLY
550 *
551 * recover_status |= NODES
552 *
553 * dlm_recover_members_wait()
554 *
555 * dlm_recover_directory()
556 * - send NAMES
557 * - recv NAMES_REPLY
558 * - ignore LOOKUP, LOOKUP_REPLY
559 * - ignore LOCK, LOCK_REPLY
560 *
561 * recover_status |= DIR
562 *
563 * dlm_recover_directory_wait()
564 *
565 * dlm_recover_masters()
566 * - send LOOKUP
567 * - recv LOOKUP_REPLY
568 *
569 * dlm_recover_locks()
570 * - send LOCKS
571 * - recv LOCKS_REPLY
572 *
573 * recover_status |= LOCKS
574 *
575 * dlm_recover_locks_wait()
576 *
577 * recover_status |= DONE
578 */
579
d6e24788
DT
580/* Called by dlm_recv; corresponds to dlm_receive_message() but special
581 recovery-only comms are sent through here. */
582
11519351 583void dlm_receive_rcom(struct dlm_ls *ls, const struct dlm_rcom *rc, int nodeid)
38aa8b0c 584{
d6e24788 585 int lock_size = sizeof(struct dlm_rcom) + sizeof(struct rcom_lock);
c04fecb4 586 int stop, reply = 0, names = 0, lookup = 0, lock = 0;
4875647a 587 uint32_t status;
38aa8b0c 588 uint64_t seq;
38aa8b0c
DT
589
590 switch (rc->rc_type) {
2f9dbeda 591 case cpu_to_le32(DLM_RCOM_STATUS_REPLY):
c04fecb4
DT
592 reply = 1;
593 break;
2f9dbeda 594 case cpu_to_le32(DLM_RCOM_NAMES):
c04fecb4
DT
595 names = 1;
596 break;
2f9dbeda 597 case cpu_to_le32(DLM_RCOM_NAMES_REPLY):
c04fecb4
DT
598 names = 1;
599 reply = 1;
600 break;
2f9dbeda 601 case cpu_to_le32(DLM_RCOM_LOOKUP):
c04fecb4
DT
602 lookup = 1;
603 break;
2f9dbeda 604 case cpu_to_le32(DLM_RCOM_LOOKUP_REPLY):
c04fecb4
DT
605 lookup = 1;
606 reply = 1;
607 break;
2f9dbeda 608 case cpu_to_le32(DLM_RCOM_LOCK):
4875647a
DT
609 lock = 1;
610 break;
2f9dbeda 611 case cpu_to_le32(DLM_RCOM_LOCK_REPLY):
4875647a
DT
612 lock = 1;
613 reply = 1;
614 break;
90db4f8b 615 }
38aa8b0c 616
d6e24788 617 spin_lock(&ls->ls_recover_lock);
4875647a 618 status = ls->ls_recover_status;
3e973671 619 stop = dlm_recovery_stopped(ls);
d6e24788
DT
620 seq = ls->ls_recover_seq;
621 spin_unlock(&ls->ls_recover_lock);
ae773d0b 622
2f9dbeda 623 if (stop && (rc->rc_type != cpu_to_le32(DLM_RCOM_STATUS)))
c04fecb4
DT
624 goto ignore;
625
2f9dbeda 626 if (reply && (le64_to_cpu(rc->rc_seq_reply) != seq))
c04fecb4
DT
627 goto ignore;
628
629 if (!(status & DLM_RS_NODES) && (names || lookup || lock))
630 goto ignore;
631
632 if (!(status & DLM_RS_DIR) && (lookup || lock))
633 goto ignore;
e7fd4179 634
e7fd4179 635 switch (rc->rc_type) {
2f9dbeda 636 case cpu_to_le32(DLM_RCOM_STATUS):
c4f4e135 637 receive_rcom_status(ls, rc, seq);
e7fd4179
DT
638 break;
639
2f9dbeda 640 case cpu_to_le32(DLM_RCOM_NAMES):
c4f4e135 641 receive_rcom_names(ls, rc, seq);
e7fd4179
DT
642 break;
643
2f9dbeda 644 case cpu_to_le32(DLM_RCOM_LOOKUP):
c4f4e135 645 receive_rcom_lookup(ls, rc, seq);
e7fd4179
DT
646 break;
647
2f9dbeda 648 case cpu_to_le32(DLM_RCOM_LOCK):
3428785a 649 if (le16_to_cpu(rc->rc_header.h_length) < lock_size)
ae773d0b 650 goto Eshort;
c4f4e135 651 receive_rcom_lock(ls, rc, seq);
e7fd4179
DT
652 break;
653
2f9dbeda 654 case cpu_to_le32(DLM_RCOM_STATUS_REPLY):
dbcfc347 655 receive_sync_reply(ls, rc);
e7fd4179
DT
656 break;
657
2f9dbeda 658 case cpu_to_le32(DLM_RCOM_NAMES_REPLY):
dbcfc347 659 receive_sync_reply(ls, rc);
e7fd4179
DT
660 break;
661
2f9dbeda 662 case cpu_to_le32(DLM_RCOM_LOOKUP_REPLY):
e7fd4179
DT
663 receive_rcom_lookup_reply(ls, rc);
664 break;
665
2f9dbeda 666 case cpu_to_le32(DLM_RCOM_LOCK_REPLY):
3428785a 667 if (le16_to_cpu(rc->rc_header.h_length) < lock_size)
ae773d0b 668 goto Eshort;
c4f4e135 669 dlm_recover_process_copy(ls, rc, seq);
e7fd4179
DT
670 break;
671
672 default:
2f9dbeda
AA
673 log_error(ls, "receive_rcom bad type %d",
674 le32_to_cpu(rc->rc_type));
e7fd4179 675 }
c04fecb4
DT
676 return;
677
678ignore:
679 log_limit(ls, "dlm_receive_rcom ignore msg %d "
680 "from %d %llu %llu recover seq %llu sts %x gen %u",
2f9dbeda 681 le32_to_cpu(rc->rc_type),
c04fecb4 682 nodeid,
2f9dbeda
AA
683 (unsigned long long)le64_to_cpu(rc->rc_seq),
684 (unsigned long long)le64_to_cpu(rc->rc_seq_reply),
c04fecb4
DT
685 (unsigned long long)seq,
686 status, ls->ls_generation);
c36258b5 687 return;
ae773d0b 688Eshort:
c04fecb4 689 log_error(ls, "recovery message %d from %d is too short",
2f9dbeda 690 le32_to_cpu(rc->rc_type), nodeid);
e7fd4179
DT
691}
692