blob: 35502d4046f573fac4909cceec1117ef033338e6 [file] [log] [blame]
David Teiglande7fd4172006-01-18 09:30:29 +00001/******************************************************************************
2*******************************************************************************
3**
David Teigland7fe2b312010-02-24 11:08:18 -06004** Copyright (C) 2005-2010 Red Hat, Inc. All rights reserved.
David Teiglande7fd4172006-01-18 09:30:29 +00005**
6** This copyrighted material is made available to anyone wishing to use,
7** modify, copy, or redistribute it subject to the terms and conditions
8** of the GNU General Public License v.2.
9**
10*******************************************************************************
11******************************************************************************/
12
13/* Central locking logic has four stages:
14
15 dlm_lock()
16 dlm_unlock()
17
18 request_lock(ls, lkb)
19 convert_lock(ls, lkb)
20 unlock_lock(ls, lkb)
21 cancel_lock(ls, lkb)
22
23 _request_lock(r, lkb)
24 _convert_lock(r, lkb)
25 _unlock_lock(r, lkb)
26 _cancel_lock(r, lkb)
27
28 do_request(r, lkb)
29 do_convert(r, lkb)
30 do_unlock(r, lkb)
31 do_cancel(r, lkb)
32
33 Stage 1 (lock, unlock) is mainly about checking input args and
34 splitting into one of the four main operations:
35
36 dlm_lock = request_lock
37 dlm_lock+CONVERT = convert_lock
38 dlm_unlock = unlock_lock
39 dlm_unlock+CANCEL = cancel_lock
40
41 Stage 2, xxxx_lock(), just finds and locks the relevant rsb which is
42 provided to the next stage.
43
44 Stage 3, _xxxx_lock(), determines if the operation is local or remote.
45 When remote, it calls send_xxxx(), when local it calls do_xxxx().
46
47 Stage 4, do_xxxx(), is the guts of the operation. It manipulates the
48 given rsb and lkb and queues callbacks.
49
50 For remote operations, send_xxxx() results in the corresponding do_xxxx()
51 function being executed on the remote node. The connecting send/receive
52 calls on local (L) and remote (R) nodes:
53
54 L: send_xxxx() -> R: receive_xxxx()
55 R: do_xxxx()
56 L: receive_xxxx_reply() <- R: send_xxxx_reply()
57*/
David Teigland597d0ca2006-07-12 16:44:04 -050058#include <linux/types.h>
Bob Peterson9beb3bf2011-10-26 15:24:55 -050059#include <linux/rbtree.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090060#include <linux/slab.h>
David Teiglande7fd4172006-01-18 09:30:29 +000061#include "dlm_internal.h"
David Teigland597d0ca2006-07-12 16:44:04 -050062#include <linux/dlm_device.h>
David Teiglande7fd4172006-01-18 09:30:29 +000063#include "memory.h"
64#include "lowcomms.h"
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"
David Teigland597d0ca2006-07-12 16:44:04 -050075#include "user.h"
David Teiglande7fd4172006-01-18 09:30:29 +000076#include "config.h"
77
78static int send_request(struct dlm_rsb *r, struct dlm_lkb *lkb);
79static int send_convert(struct dlm_rsb *r, struct dlm_lkb *lkb);
80static int send_unlock(struct dlm_rsb *r, struct dlm_lkb *lkb);
81static int send_cancel(struct dlm_rsb *r, struct dlm_lkb *lkb);
82static int send_grant(struct dlm_rsb *r, struct dlm_lkb *lkb);
83static int send_bast(struct dlm_rsb *r, struct dlm_lkb *lkb, int mode);
84static int send_lookup(struct dlm_rsb *r, struct dlm_lkb *lkb);
85static int send_remove(struct dlm_rsb *r);
86static int _request_lock(struct dlm_rsb *r, struct dlm_lkb *lkb);
David Teigland3ae1acf2007-05-18 08:59:31 -050087static int _cancel_lock(struct dlm_rsb *r, struct dlm_lkb *lkb);
David Teiglande7fd4172006-01-18 09:30:29 +000088static void __receive_convert_reply(struct dlm_rsb *r, struct dlm_lkb *lkb,
89 struct dlm_message *ms);
90static int receive_extralen(struct dlm_message *ms);
David Teigland84991372007-03-30 15:02:40 -050091static void do_purge(struct dlm_ls *ls, int nodeid, int pid);
David Teigland3ae1acf2007-05-18 08:59:31 -050092static void del_timeout(struct dlm_lkb *lkb);
David Teiglandc04fecb2012-05-10 10:18:07 -050093static void toss_rsb(struct kref *kref);
David Teiglande7fd4172006-01-18 09:30:29 +000094
95/*
96 * Lock compatibilty matrix - thanks Steve
97 * UN = Unlocked state. Not really a state, used as a flag
98 * PD = Padding. Used to make the matrix a nice power of two in size
99 * Other states are the same as the VMS DLM.
100 * Usage: matrix[grmode+1][rqmode+1] (although m[rq+1][gr+1] is the same)
101 */
102
103static const int __dlm_compat_matrix[8][8] = {
104 /* UN NL CR CW PR PW EX PD */
105 {1, 1, 1, 1, 1, 1, 1, 0}, /* UN */
106 {1, 1, 1, 1, 1, 1, 1, 0}, /* NL */
107 {1, 1, 1, 1, 1, 1, 0, 0}, /* CR */
108 {1, 1, 1, 1, 0, 0, 0, 0}, /* CW */
109 {1, 1, 1, 0, 1, 0, 0, 0}, /* PR */
110 {1, 1, 1, 0, 0, 0, 0, 0}, /* PW */
111 {1, 1, 0, 0, 0, 0, 0, 0}, /* EX */
112 {0, 0, 0, 0, 0, 0, 0, 0} /* PD */
113};
114
115/*
116 * This defines the direction of transfer of LVB data.
117 * Granted mode is the row; requested mode is the column.
118 * Usage: matrix[grmode+1][rqmode+1]
119 * 1 = LVB is returned to the caller
120 * 0 = LVB is written to the resource
121 * -1 = nothing happens to the LVB
122 */
123
124const int dlm_lvb_operations[8][8] = {
125 /* UN NL CR CW PR PW EX PD*/
126 { -1, 1, 1, 1, 1, 1, 1, -1 }, /* UN */
127 { -1, 1, 1, 1, 1, 1, 1, 0 }, /* NL */
128 { -1, -1, 1, 1, 1, 1, 1, 0 }, /* CR */
129 { -1, -1, -1, 1, 1, 1, 1, 0 }, /* CW */
130 { -1, -1, -1, -1, 1, 1, 1, 0 }, /* PR */
131 { -1, 0, 0, 0, 0, 0, 1, 0 }, /* PW */
132 { -1, 0, 0, 0, 0, 0, 0, 0 }, /* EX */
133 { -1, 0, 0, 0, 0, 0, 0, 0 } /* PD */
134};
David Teiglande7fd4172006-01-18 09:30:29 +0000135
136#define modes_compat(gr, rq) \
137 __dlm_compat_matrix[(gr)->lkb_grmode + 1][(rq)->lkb_rqmode + 1]
138
139int dlm_modes_compat(int mode1, int mode2)
140{
141 return __dlm_compat_matrix[mode1 + 1][mode2 + 1];
142}
143
144/*
145 * Compatibility matrix for conversions with QUECVT set.
146 * Granted mode is the row; requested mode is the column.
147 * Usage: matrix[grmode+1][rqmode+1]
148 */
149
150static const int __quecvt_compat_matrix[8][8] = {
151 /* UN NL CR CW PR PW EX PD */
152 {0, 0, 0, 0, 0, 0, 0, 0}, /* UN */
153 {0, 0, 1, 1, 1, 1, 1, 0}, /* NL */
154 {0, 0, 0, 1, 1, 1, 1, 0}, /* CR */
155 {0, 0, 0, 0, 1, 1, 1, 0}, /* CW */
156 {0, 0, 0, 1, 0, 1, 1, 0}, /* PR */
157 {0, 0, 0, 0, 0, 0, 1, 0}, /* PW */
158 {0, 0, 0, 0, 0, 0, 0, 0}, /* EX */
159 {0, 0, 0, 0, 0, 0, 0, 0} /* PD */
160};
161
David Teigland597d0ca2006-07-12 16:44:04 -0500162void dlm_print_lkb(struct dlm_lkb *lkb)
David Teiglande7fd4172006-01-18 09:30:29 +0000163{
David Teigland6d40c4a2012-04-23 16:36:01 -0500164 printk(KERN_ERR "lkb: nodeid %d id %x remid %x exflags %x flags %x "
David Teigland48756472012-04-26 15:54:29 -0500165 "sts %d rq %d gr %d wait_type %d wait_nodeid %d seq %llu\n",
David Teiglande7fd4172006-01-18 09:30:29 +0000166 lkb->lkb_nodeid, lkb->lkb_id, lkb->lkb_remid, lkb->lkb_exflags,
167 lkb->lkb_flags, lkb->lkb_status, lkb->lkb_rqmode,
David Teigland48756472012-04-26 15:54:29 -0500168 lkb->lkb_grmode, lkb->lkb_wait_type, lkb->lkb_wait_nodeid,
169 (unsigned long long)lkb->lkb_recover_seq);
David Teiglande7fd4172006-01-18 09:30:29 +0000170}
171
Adrian Bunk170e19a2008-02-13 23:29:38 +0200172static void dlm_print_rsb(struct dlm_rsb *r)
David Teiglande7fd4172006-01-18 09:30:29 +0000173{
David Teiglandc04fecb2012-05-10 10:18:07 -0500174 printk(KERN_ERR "rsb: nodeid %d master %d dir %d flags %lx first %x "
175 "rlc %d name %s\n",
176 r->res_nodeid, r->res_master_nodeid, r->res_dir_nodeid,
177 r->res_flags, r->res_first_lkid, r->res_recover_locks_count,
178 r->res_name);
David Teiglande7fd4172006-01-18 09:30:29 +0000179}
180
David Teiglanda345da32006-08-18 11:54:25 -0500181void dlm_dump_rsb(struct dlm_rsb *r)
182{
183 struct dlm_lkb *lkb;
184
185 dlm_print_rsb(r);
186
187 printk(KERN_ERR "rsb: root_list empty %d recover_list empty %d\n",
188 list_empty(&r->res_root_list), list_empty(&r->res_recover_list));
189 printk(KERN_ERR "rsb lookup list\n");
190 list_for_each_entry(lkb, &r->res_lookup, lkb_rsb_lookup)
191 dlm_print_lkb(lkb);
192 printk(KERN_ERR "rsb grant queue:\n");
193 list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue)
194 dlm_print_lkb(lkb);
195 printk(KERN_ERR "rsb convert queue:\n");
196 list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue)
197 dlm_print_lkb(lkb);
198 printk(KERN_ERR "rsb wait queue:\n");
199 list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue)
200 dlm_print_lkb(lkb);
201}
202
David Teiglande7fd4172006-01-18 09:30:29 +0000203/* Threads cannot use the lockspace while it's being recovered */
204
David Teigland85e86ed2007-05-18 08:58:15 -0500205static inline void dlm_lock_recovery(struct dlm_ls *ls)
David Teiglande7fd4172006-01-18 09:30:29 +0000206{
207 down_read(&ls->ls_in_recovery);
208}
209
David Teigland85e86ed2007-05-18 08:58:15 -0500210void dlm_unlock_recovery(struct dlm_ls *ls)
David Teiglande7fd4172006-01-18 09:30:29 +0000211{
212 up_read(&ls->ls_in_recovery);
213}
214
David Teigland85e86ed2007-05-18 08:58:15 -0500215int dlm_lock_recovery_try(struct dlm_ls *ls)
David Teiglande7fd4172006-01-18 09:30:29 +0000216{
217 return down_read_trylock(&ls->ls_in_recovery);
218}
219
220static inline int can_be_queued(struct dlm_lkb *lkb)
221{
222 return !(lkb->lkb_exflags & DLM_LKF_NOQUEUE);
223}
224
225static inline int force_blocking_asts(struct dlm_lkb *lkb)
226{
227 return (lkb->lkb_exflags & DLM_LKF_NOQUEUEBAST);
228}
229
230static inline int is_demoted(struct dlm_lkb *lkb)
231{
232 return (lkb->lkb_sbflags & DLM_SBF_DEMOTED);
233}
234
David Teigland7d3c1fe2007-04-19 10:30:41 -0500235static inline int is_altmode(struct dlm_lkb *lkb)
236{
237 return (lkb->lkb_sbflags & DLM_SBF_ALTMODE);
238}
239
240static inline int is_granted(struct dlm_lkb *lkb)
241{
242 return (lkb->lkb_status == DLM_LKSTS_GRANTED);
243}
244
David Teiglande7fd4172006-01-18 09:30:29 +0000245static inline int is_remote(struct dlm_rsb *r)
246{
247 DLM_ASSERT(r->res_nodeid >= 0, dlm_print_rsb(r););
248 return !!r->res_nodeid;
249}
250
251static inline int is_process_copy(struct dlm_lkb *lkb)
252{
253 return (lkb->lkb_nodeid && !(lkb->lkb_flags & DLM_IFL_MSTCPY));
254}
255
256static inline int is_master_copy(struct dlm_lkb *lkb)
257{
David Teigland90135922006-01-20 08:47:07 +0000258 return (lkb->lkb_flags & DLM_IFL_MSTCPY) ? 1 : 0;
David Teiglande7fd4172006-01-18 09:30:29 +0000259}
260
261static 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))
David Teigland90135922006-01-20 08:47:07 +0000265 return 1;
266 return 0;
David Teiglande7fd4172006-01-18 09:30:29 +0000267}
268
269static inline int down_conversion(struct dlm_lkb *lkb)
270{
271 return (!middle_conversion(lkb) && lkb->lkb_rqmode < lkb->lkb_grmode);
272}
273
David Teiglandef0c2bb2007-03-28 09:56:46 -0500274static inline int is_overlap_unlock(struct dlm_lkb *lkb)
275{
276 return lkb->lkb_flags & DLM_IFL_OVERLAP_UNLOCK;
277}
278
279static inline int is_overlap_cancel(struct dlm_lkb *lkb)
280{
281 return lkb->lkb_flags & DLM_IFL_OVERLAP_CANCEL;
282}
283
284static inline int is_overlap(struct dlm_lkb *lkb)
285{
286 return (lkb->lkb_flags & (DLM_IFL_OVERLAP_UNLOCK |
287 DLM_IFL_OVERLAP_CANCEL));
288}
289
David Teiglande7fd4172006-01-18 09:30:29 +0000290static void queue_cast(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv)
291{
292 if (is_master_copy(lkb))
293 return;
294
David Teigland3ae1acf2007-05-18 08:59:31 -0500295 del_timeout(lkb);
296
David Teiglande7fd4172006-01-18 09:30:29 +0000297 DLM_ASSERT(lkb->lkb_lksb, dlm_print_lkb(lkb););
298
David Teigland3ae1acf2007-05-18 08:59:31 -0500299 /* if the operation was a cancel, then return -DLM_ECANCEL, if a
300 timeout caused the cancel then return -ETIMEDOUT */
301 if (rv == -DLM_ECANCEL && (lkb->lkb_flags & DLM_IFL_TIMEOUT_CANCEL)) {
302 lkb->lkb_flags &= ~DLM_IFL_TIMEOUT_CANCEL;
303 rv = -ETIMEDOUT;
304 }
305
David Teigland8b4021f2007-05-29 08:46:00 -0500306 if (rv == -DLM_ECANCEL && (lkb->lkb_flags & DLM_IFL_DEADLOCK_CANCEL)) {
307 lkb->lkb_flags &= ~DLM_IFL_DEADLOCK_CANCEL;
308 rv = -EDEADLK;
309 }
310
David Teigland23e8e1a2011-04-05 13:16:24 -0500311 dlm_add_cb(lkb, DLM_CB_CAST, lkb->lkb_grmode, rv, lkb->lkb_sbflags);
David Teiglande7fd4172006-01-18 09:30:29 +0000312}
313
David Teiglandef0c2bb2007-03-28 09:56:46 -0500314static inline void queue_cast_overlap(struct dlm_rsb *r, struct dlm_lkb *lkb)
315{
316 queue_cast(r, lkb,
317 is_overlap_unlock(lkb) ? -DLM_EUNLOCK : -DLM_ECANCEL);
318}
319
David Teiglande7fd4172006-01-18 09:30:29 +0000320static void queue_bast(struct dlm_rsb *r, struct dlm_lkb *lkb, int rqmode)
321{
David Teiglandb6fa8792010-02-25 12:20:57 -0600322 if (is_master_copy(lkb)) {
David Teiglande7fd4172006-01-18 09:30:29 +0000323 send_bast(r, lkb, rqmode);
David Teiglandb6fa8792010-02-25 12:20:57 -0600324 } else {
David Teigland23e8e1a2011-04-05 13:16:24 -0500325 dlm_add_cb(lkb, DLM_CB_BAST, rqmode, 0, 0);
David Teiglandb6fa8792010-02-25 12:20:57 -0600326 }
David Teiglande7fd4172006-01-18 09:30:29 +0000327}
328
329/*
330 * Basic operations on rsb's and lkb's
331 */
332
David Teiglandc04fecb2012-05-10 10:18:07 -0500333/* This is only called to add a reference when the code already holds
334 a valid reference to the rsb, so there's no need for locking. */
335
336static inline void hold_rsb(struct dlm_rsb *r)
337{
338 kref_get(&r->res_ref);
339}
340
341void dlm_hold_rsb(struct dlm_rsb *r)
342{
343 hold_rsb(r);
344}
345
346/* When all references to the rsb are gone it's transferred to
347 the tossed list for later disposal. */
348
349static void put_rsb(struct dlm_rsb *r)
350{
351 struct dlm_ls *ls = r->res_ls;
352 uint32_t bucket = r->res_bucket;
353
354 spin_lock(&ls->ls_rsbtbl[bucket].lock);
355 kref_put(&r->res_ref, toss_rsb);
356 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
357}
358
359void dlm_put_rsb(struct dlm_rsb *r)
360{
361 put_rsb(r);
362}
363
David Teigland3881ac02011-07-07 14:05:03 -0500364static int pre_rsb_struct(struct dlm_ls *ls)
365{
366 struct dlm_rsb *r1, *r2;
367 int count = 0;
368
369 spin_lock(&ls->ls_new_rsb_spin);
370 if (ls->ls_new_rsb_count > dlm_config.ci_new_rsb_count / 2) {
371 spin_unlock(&ls->ls_new_rsb_spin);
372 return 0;
373 }
374 spin_unlock(&ls->ls_new_rsb_spin);
375
376 r1 = dlm_allocate_rsb(ls);
377 r2 = dlm_allocate_rsb(ls);
378
379 spin_lock(&ls->ls_new_rsb_spin);
380 if (r1) {
381 list_add(&r1->res_hashchain, &ls->ls_new_rsb);
382 ls->ls_new_rsb_count++;
383 }
384 if (r2) {
385 list_add(&r2->res_hashchain, &ls->ls_new_rsb);
386 ls->ls_new_rsb_count++;
387 }
388 count = ls->ls_new_rsb_count;
389 spin_unlock(&ls->ls_new_rsb_spin);
390
391 if (!count)
392 return -ENOMEM;
393 return 0;
394}
395
396/* If ls->ls_new_rsb is empty, return -EAGAIN, so the caller can
397 unlock any spinlocks, go back and call pre_rsb_struct again.
398 Otherwise, take an rsb off the list and return it. */
399
400static int get_rsb_struct(struct dlm_ls *ls, char *name, int len,
401 struct dlm_rsb **r_ret)
David Teiglande7fd4172006-01-18 09:30:29 +0000402{
403 struct dlm_rsb *r;
David Teigland3881ac02011-07-07 14:05:03 -0500404 int count;
David Teiglande7fd4172006-01-18 09:30:29 +0000405
David Teigland3881ac02011-07-07 14:05:03 -0500406 spin_lock(&ls->ls_new_rsb_spin);
407 if (list_empty(&ls->ls_new_rsb)) {
408 count = ls->ls_new_rsb_count;
409 spin_unlock(&ls->ls_new_rsb_spin);
410 log_debug(ls, "find_rsb retry %d %d %s",
411 count, dlm_config.ci_new_rsb_count, name);
412 return -EAGAIN;
413 }
414
415 r = list_first_entry(&ls->ls_new_rsb, struct dlm_rsb, res_hashchain);
416 list_del(&r->res_hashchain);
Bob Peterson9beb3bf2011-10-26 15:24:55 -0500417 /* Convert the empty list_head to a NULL rb_node for tree usage: */
418 memset(&r->res_hashnode, 0, sizeof(struct rb_node));
David Teigland3881ac02011-07-07 14:05:03 -0500419 ls->ls_new_rsb_count--;
420 spin_unlock(&ls->ls_new_rsb_spin);
David Teiglande7fd4172006-01-18 09:30:29 +0000421
422 r->res_ls = ls;
423 r->res_length = len;
424 memcpy(r->res_name, name, len);
David Teigland90135922006-01-20 08:47:07 +0000425 mutex_init(&r->res_mutex);
David Teiglande7fd4172006-01-18 09:30:29 +0000426
427 INIT_LIST_HEAD(&r->res_lookup);
428 INIT_LIST_HEAD(&r->res_grantqueue);
429 INIT_LIST_HEAD(&r->res_convertqueue);
430 INIT_LIST_HEAD(&r->res_waitqueue);
431 INIT_LIST_HEAD(&r->res_root_list);
432 INIT_LIST_HEAD(&r->res_recover_list);
433
David Teigland3881ac02011-07-07 14:05:03 -0500434 *r_ret = r;
435 return 0;
David Teiglande7fd4172006-01-18 09:30:29 +0000436}
437
Bob Peterson9beb3bf2011-10-26 15:24:55 -0500438static int rsb_cmp(struct dlm_rsb *r, const char *name, int nlen)
439{
440 char maxname[DLM_RESNAME_MAXLEN];
441
442 memset(maxname, 0, DLM_RESNAME_MAXLEN);
443 memcpy(maxname, name, nlen);
444 return memcmp(r->res_name, maxname, DLM_RESNAME_MAXLEN);
445}
446
David Teigland7210cb72012-03-08 12:37:12 -0600447int dlm_search_rsb_tree(struct rb_root *tree, char *name, int len,
David Teiglandc04fecb2012-05-10 10:18:07 -0500448 struct dlm_rsb **r_ret)
David Teiglande7fd4172006-01-18 09:30:29 +0000449{
Bob Peterson9beb3bf2011-10-26 15:24:55 -0500450 struct rb_node *node = tree->rb_node;
David Teiglande7fd4172006-01-18 09:30:29 +0000451 struct dlm_rsb *r;
Bob Peterson9beb3bf2011-10-26 15:24:55 -0500452 int rc;
David Teiglande7fd4172006-01-18 09:30:29 +0000453
Bob Peterson9beb3bf2011-10-26 15:24:55 -0500454 while (node) {
455 r = rb_entry(node, struct dlm_rsb, res_hashnode);
456 rc = rsb_cmp(r, name, len);
457 if (rc < 0)
458 node = node->rb_left;
459 else if (rc > 0)
460 node = node->rb_right;
461 else
David Teiglande7fd4172006-01-18 09:30:29 +0000462 goto found;
463 }
Benny Halevy18c60c02008-06-30 19:59:14 +0300464 *r_ret = NULL;
David Teigland597d0ca2006-07-12 16:44:04 -0500465 return -EBADR;
David Teiglande7fd4172006-01-18 09:30:29 +0000466
467 found:
David Teiglande7fd4172006-01-18 09:30:29 +0000468 *r_ret = r;
David Teiglandc04fecb2012-05-10 10:18:07 -0500469 return 0;
David Teiglande7fd4172006-01-18 09:30:29 +0000470}
471
Bob Peterson9beb3bf2011-10-26 15:24:55 -0500472static int rsb_insert(struct dlm_rsb *rsb, struct rb_root *tree)
473{
474 struct rb_node **newn = &tree->rb_node;
475 struct rb_node *parent = NULL;
476 int rc;
477
478 while (*newn) {
479 struct dlm_rsb *cur = rb_entry(*newn, struct dlm_rsb,
480 res_hashnode);
481
482 parent = *newn;
483 rc = rsb_cmp(cur, rsb->res_name, rsb->res_length);
484 if (rc < 0)
485 newn = &parent->rb_left;
486 else if (rc > 0)
487 newn = &parent->rb_right;
488 else {
489 log_print("rsb_insert match");
490 dlm_dump_rsb(rsb);
491 dlm_dump_rsb(cur);
492 return -EEXIST;
493 }
494 }
495
496 rb_link_node(&rsb->res_hashnode, parent, newn);
497 rb_insert_color(&rsb->res_hashnode, tree);
498 return 0;
499}
500
David Teiglande7fd4172006-01-18 09:30:29 +0000501/*
502 * Find rsb in rsbtbl and potentially create/add one
503 *
504 * Delaying the release of rsb's has a similar benefit to applications keeping
505 * NL locks on an rsb, but without the guarantee that the cached master value
506 * will still be valid when the rsb is reused. Apps aren't always smart enough
507 * to keep NL locks on an rsb that they may lock again shortly; this can lead
508 * to excessive master lookups and removals if we don't delay the release.
509 *
510 * Searching for an rsb means looking through both the normal list and toss
511 * list. When found on the toss list the rsb is moved to the normal list with
512 * ref count of 1; when found on normal list the ref count is incremented.
David Teiglandc04fecb2012-05-10 10:18:07 -0500513 *
514 * rsb's on the keep list are being used locally and refcounted.
515 * rsb's on the toss list are not being used locally, and are not refcounted.
516 *
517 * The toss list rsb's were either
518 * - previously used locally but not any more (were on keep list, then
519 * moved to toss list when last refcount dropped)
520 * - created and put on toss list as a directory record for a lookup
521 * (we are the dir node for the res, but are not using the res right now,
522 * but some other node is)
523 *
524 * The purpose of find_rsb() is to return a refcounted rsb for local use.
525 * So, if the given rsb is on the toss list, it is moved to the keep list
526 * before being returned.
527 *
528 * toss_rsb() happens when all local usage of the rsb is done, i.e. no
529 * more refcounts exist, so the rsb is moved from the keep list to the
530 * toss list.
531 *
532 * rsb's on both keep and toss lists are used for doing a name to master
533 * lookups. rsb's that are in use locally (and being refcounted) are on
534 * the keep list, rsb's that are not in use locally (not refcounted) and
535 * only exist for name/master lookups are on the toss list.
536 *
537 * rsb's on the toss list who's dir_nodeid is not local can have stale
538 * name/master mappings. So, remote requests on such rsb's can potentially
539 * return with an error, which means the mapping is stale and needs to
540 * be updated with a new lookup. (The idea behind MASTER UNCERTAIN and
541 * first_lkid is to keep only a single outstanding request on an rsb
542 * while that rsb has a potentially stale master.)
David Teiglande7fd4172006-01-18 09:30:29 +0000543 */
544
David Teiglandc04fecb2012-05-10 10:18:07 -0500545static int find_rsb_dir(struct dlm_ls *ls, char *name, int len,
546 uint32_t hash, uint32_t b,
547 int dir_nodeid, int from_nodeid,
548 unsigned int flags, struct dlm_rsb **r_ret)
David Teiglande7fd4172006-01-18 09:30:29 +0000549{
David Teigland3881ac02011-07-07 14:05:03 -0500550 struct dlm_rsb *r = NULL;
David Teiglandc04fecb2012-05-10 10:18:07 -0500551 int our_nodeid = dlm_our_nodeid();
552 int from_local = 0;
553 int from_other = 0;
554 int from_dir = 0;
555 int create = 0;
David Teigland3881ac02011-07-07 14:05:03 -0500556 int error;
Al Viroef58bcc2008-01-25 23:22:26 -0500557
David Teiglandc04fecb2012-05-10 10:18:07 -0500558 if (flags & R_RECEIVE_REQUEST) {
559 if (from_nodeid == dir_nodeid)
560 from_dir = 1;
561 else
562 from_other = 1;
563 } else if (flags & R_REQUEST) {
564 from_local = 1;
David Teigland3881ac02011-07-07 14:05:03 -0500565 }
David Teiglande7fd4172006-01-18 09:30:29 +0000566
David Teiglandc04fecb2012-05-10 10:18:07 -0500567 /*
568 * flags & R_RECEIVE_RECOVER is from dlm_recover_master_copy, so
569 * from_nodeid has sent us a lock in dlm_recover_locks, believing
570 * we're the new master. Our local recovery may not have set
571 * res_master_nodeid to our_nodeid yet, so allow either. Don't
572 * create the rsb; dlm_recover_process_copy() will handle EBADR
573 * by resending.
574 *
575 * If someone sends us a request, we are the dir node, and we do
576 * not find the rsb anywhere, then recreate it. This happens if
577 * someone sends us a request after we have removed/freed an rsb
578 * from our toss list. (They sent a request instead of lookup
579 * because they are using an rsb from their toss list.)
580 */
David Teiglande7fd4172006-01-18 09:30:29 +0000581
David Teiglandc04fecb2012-05-10 10:18:07 -0500582 if (from_local || from_dir ||
583 (from_other && (dir_nodeid == our_nodeid))) {
584 create = 1;
585 }
David Teiglande7fd4172006-01-18 09:30:29 +0000586
David Teigland3881ac02011-07-07 14:05:03 -0500587 retry:
David Teiglandc04fecb2012-05-10 10:18:07 -0500588 if (create) {
David Teigland3881ac02011-07-07 14:05:03 -0500589 error = pre_rsb_struct(ls);
590 if (error < 0)
591 goto out;
592 }
593
David Teiglandc04fecb2012-05-10 10:18:07 -0500594 spin_lock(&ls->ls_rsbtbl[b].lock);
David Teigland3881ac02011-07-07 14:05:03 -0500595
David Teiglandc04fecb2012-05-10 10:18:07 -0500596 error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].keep, name, len, &r);
597 if (error)
598 goto do_toss;
599
600 /*
601 * rsb is active, so we can't check master_nodeid without lock_rsb.
602 */
603
604 kref_get(&r->res_ref);
605 error = 0;
606 goto out_unlock;
607
608
609 do_toss:
610 error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].toss, name, len, &r);
611 if (error)
612 goto do_new;
613
614 /*
615 * rsb found inactive (master_nodeid may be out of date unless
616 * we are the dir_nodeid or were the master) No other thread
617 * is using this rsb because it's on the toss list, so we can
618 * look at or update res_master_nodeid without lock_rsb.
619 */
620
621 if ((r->res_master_nodeid != our_nodeid) && from_other) {
622 /* our rsb was not master, and another node (not the dir node)
623 has sent us a request */
624 log_debug(ls, "find_rsb toss from_other %d master %d dir %d %s",
625 from_nodeid, r->res_master_nodeid, dir_nodeid,
626 r->res_name);
627 error = -ENOTBLK;
628 goto out_unlock;
629 }
630
631 if ((r->res_master_nodeid != our_nodeid) && from_dir) {
632 /* don't think this should ever happen */
633 log_error(ls, "find_rsb toss from_dir %d master %d",
634 from_nodeid, r->res_master_nodeid);
635 dlm_print_rsb(r);
636 /* fix it and go on */
637 r->res_master_nodeid = our_nodeid;
638 r->res_nodeid = 0;
639 rsb_clear_flag(r, RSB_MASTER_UNCERTAIN);
640 r->res_first_lkid = 0;
641 }
642
643 if (from_local && (r->res_master_nodeid != our_nodeid)) {
644 /* Because we have held no locks on this rsb,
645 res_master_nodeid could have become stale. */
646 rsb_set_flag(r, RSB_MASTER_UNCERTAIN);
647 r->res_first_lkid = 0;
648 }
649
650 rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[b].toss);
651 error = rsb_insert(r, &ls->ls_rsbtbl[b].keep);
652 goto out_unlock;
653
654
655 do_new:
656 /*
657 * rsb not found
658 */
659
660 if (error == -EBADR && !create)
David Teigland3881ac02011-07-07 14:05:03 -0500661 goto out_unlock;
David Teiglande7fd4172006-01-18 09:30:29 +0000662
David Teiglandc04fecb2012-05-10 10:18:07 -0500663 error = get_rsb_struct(ls, name, len, &r);
David Teigland3881ac02011-07-07 14:05:03 -0500664 if (error == -EAGAIN) {
David Teiglandc04fecb2012-05-10 10:18:07 -0500665 spin_unlock(&ls->ls_rsbtbl[b].lock);
David Teigland3881ac02011-07-07 14:05:03 -0500666 goto retry;
667 }
668 if (error)
669 goto out_unlock;
David Teiglande7fd4172006-01-18 09:30:29 +0000670
671 r->res_hash = hash;
David Teiglandc04fecb2012-05-10 10:18:07 -0500672 r->res_bucket = b;
673 r->res_dir_nodeid = dir_nodeid;
David Teiglande7fd4172006-01-18 09:30:29 +0000674 kref_init(&r->res_ref);
675
David Teiglandc04fecb2012-05-10 10:18:07 -0500676 if (from_dir) {
677 /* want to see how often this happens */
678 log_debug(ls, "find_rsb new from_dir %d recreate %s",
679 from_nodeid, r->res_name);
680 r->res_master_nodeid = our_nodeid;
681 r->res_nodeid = 0;
682 goto out_add;
David Teiglande7fd4172006-01-18 09:30:29 +0000683 }
David Teiglandc04fecb2012-05-10 10:18:07 -0500684
685 if (from_other && (dir_nodeid != our_nodeid)) {
686 /* should never happen */
687 log_error(ls, "find_rsb new from_other %d dir %d our %d %s",
688 from_nodeid, dir_nodeid, our_nodeid, r->res_name);
689 dlm_free_rsb(r);
Dan Carpentere8243f32014-02-05 16:21:53 +0300690 r = NULL;
David Teiglandc04fecb2012-05-10 10:18:07 -0500691 error = -ENOTBLK;
692 goto out_unlock;
693 }
694
695 if (from_other) {
696 log_debug(ls, "find_rsb new from_other %d dir %d %s",
697 from_nodeid, dir_nodeid, r->res_name);
698 }
699
700 if (dir_nodeid == our_nodeid) {
701 /* When we are the dir nodeid, we can set the master
702 node immediately */
703 r->res_master_nodeid = our_nodeid;
704 r->res_nodeid = 0;
705 } else {
706 /* set_master will send_lookup to dir_nodeid */
707 r->res_master_nodeid = 0;
708 r->res_nodeid = -1;
709 }
710
711 out_add:
712 error = rsb_insert(r, &ls->ls_rsbtbl[b].keep);
David Teigland3881ac02011-07-07 14:05:03 -0500713 out_unlock:
David Teiglandc04fecb2012-05-10 10:18:07 -0500714 spin_unlock(&ls->ls_rsbtbl[b].lock);
David Teiglande7fd4172006-01-18 09:30:29 +0000715 out:
716 *r_ret = r;
717 return error;
718}
719
David Teiglandc04fecb2012-05-10 10:18:07 -0500720/* During recovery, other nodes can send us new MSTCPY locks (from
721 dlm_recover_locks) before we've made ourself master (in
722 dlm_recover_masters). */
723
724static int find_rsb_nodir(struct dlm_ls *ls, char *name, int len,
725 uint32_t hash, uint32_t b,
726 int dir_nodeid, int from_nodeid,
727 unsigned int flags, struct dlm_rsb **r_ret)
728{
729 struct dlm_rsb *r = NULL;
730 int our_nodeid = dlm_our_nodeid();
731 int recover = (flags & R_RECEIVE_RECOVER);
732 int error;
733
734 retry:
735 error = pre_rsb_struct(ls);
736 if (error < 0)
737 goto out;
738
739 spin_lock(&ls->ls_rsbtbl[b].lock);
740
741 error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].keep, name, len, &r);
742 if (error)
743 goto do_toss;
744
745 /*
746 * rsb is active, so we can't check master_nodeid without lock_rsb.
747 */
748
749 kref_get(&r->res_ref);
750 goto out_unlock;
751
752
753 do_toss:
754 error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].toss, name, len, &r);
755 if (error)
756 goto do_new;
757
758 /*
759 * rsb found inactive. No other thread is using this rsb because
760 * it's on the toss list, so we can look at or update
761 * res_master_nodeid without lock_rsb.
762 */
763
764 if (!recover && (r->res_master_nodeid != our_nodeid) && from_nodeid) {
765 /* our rsb is not master, and another node has sent us a
766 request; this should never happen */
767 log_error(ls, "find_rsb toss from_nodeid %d master %d dir %d",
768 from_nodeid, r->res_master_nodeid, dir_nodeid);
769 dlm_print_rsb(r);
770 error = -ENOTBLK;
771 goto out_unlock;
772 }
773
774 if (!recover && (r->res_master_nodeid != our_nodeid) &&
775 (dir_nodeid == our_nodeid)) {
776 /* our rsb is not master, and we are dir; may as well fix it;
777 this should never happen */
778 log_error(ls, "find_rsb toss our %d master %d dir %d",
779 our_nodeid, r->res_master_nodeid, dir_nodeid);
780 dlm_print_rsb(r);
781 r->res_master_nodeid = our_nodeid;
782 r->res_nodeid = 0;
783 }
784
785 rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[b].toss);
786 error = rsb_insert(r, &ls->ls_rsbtbl[b].keep);
787 goto out_unlock;
788
789
790 do_new:
791 /*
792 * rsb not found
793 */
794
795 error = get_rsb_struct(ls, name, len, &r);
796 if (error == -EAGAIN) {
797 spin_unlock(&ls->ls_rsbtbl[b].lock);
798 goto retry;
799 }
800 if (error)
801 goto out_unlock;
802
803 r->res_hash = hash;
804 r->res_bucket = b;
805 r->res_dir_nodeid = dir_nodeid;
806 r->res_master_nodeid = dir_nodeid;
807 r->res_nodeid = (dir_nodeid == our_nodeid) ? 0 : dir_nodeid;
808 kref_init(&r->res_ref);
809
810 error = rsb_insert(r, &ls->ls_rsbtbl[b].keep);
811 out_unlock:
812 spin_unlock(&ls->ls_rsbtbl[b].lock);
813 out:
814 *r_ret = r;
815 return error;
816}
817
818static int find_rsb(struct dlm_ls *ls, char *name, int len, int from_nodeid,
819 unsigned int flags, struct dlm_rsb **r_ret)
820{
821 uint32_t hash, b;
822 int dir_nodeid;
823
824 if (len > DLM_RESNAME_MAXLEN)
825 return -EINVAL;
826
827 hash = jhash(name, len, 0);
828 b = hash & (ls->ls_rsbtbl_size - 1);
829
830 dir_nodeid = dlm_hash2nodeid(ls, hash);
831
832 if (dlm_no_directory(ls))
833 return find_rsb_nodir(ls, name, len, hash, b, dir_nodeid,
834 from_nodeid, flags, r_ret);
835 else
836 return find_rsb_dir(ls, name, len, hash, b, dir_nodeid,
837 from_nodeid, flags, r_ret);
838}
839
840/* we have received a request and found that res_master_nodeid != our_nodeid,
841 so we need to return an error or make ourself the master */
842
843static int validate_master_nodeid(struct dlm_ls *ls, struct dlm_rsb *r,
844 int from_nodeid)
845{
846 if (dlm_no_directory(ls)) {
847 log_error(ls, "find_rsb keep from_nodeid %d master %d dir %d",
848 from_nodeid, r->res_master_nodeid,
849 r->res_dir_nodeid);
850 dlm_print_rsb(r);
851 return -ENOTBLK;
852 }
853
854 if (from_nodeid != r->res_dir_nodeid) {
855 /* our rsb is not master, and another node (not the dir node)
856 has sent us a request. this is much more common when our
857 master_nodeid is zero, so limit debug to non-zero. */
858
859 if (r->res_master_nodeid) {
860 log_debug(ls, "validate master from_other %d master %d "
861 "dir %d first %x %s", from_nodeid,
862 r->res_master_nodeid, r->res_dir_nodeid,
863 r->res_first_lkid, r->res_name);
864 }
865 return -ENOTBLK;
866 } else {
867 /* our rsb is not master, but the dir nodeid has sent us a
868 request; this could happen with master 0 / res_nodeid -1 */
869
870 if (r->res_master_nodeid) {
871 log_error(ls, "validate master from_dir %d master %d "
872 "first %x %s",
873 from_nodeid, r->res_master_nodeid,
874 r->res_first_lkid, r->res_name);
875 }
876
877 r->res_master_nodeid = dlm_our_nodeid();
878 r->res_nodeid = 0;
879 return 0;
880 }
881}
882
883/*
884 * We're the dir node for this res and another node wants to know the
885 * master nodeid. During normal operation (non recovery) this is only
886 * called from receive_lookup(); master lookups when the local node is
887 * the dir node are done by find_rsb().
888 *
889 * normal operation, we are the dir node for a resource
890 * . _request_lock
891 * . set_master
892 * . send_lookup
893 * . receive_lookup
894 * . dlm_master_lookup flags 0
895 *
896 * recover directory, we are rebuilding dir for all resources
897 * . dlm_recover_directory
898 * . dlm_rcom_names
899 * remote node sends back the rsb names it is master of and we are dir of
900 * . dlm_master_lookup RECOVER_DIR (fix_master 0, from_master 1)
901 * we either create new rsb setting remote node as master, or find existing
902 * rsb and set master to be the remote node.
903 *
904 * recover masters, we are finding the new master for resources
905 * . dlm_recover_masters
906 * . recover_master
907 * . dlm_send_rcom_lookup
908 * . receive_rcom_lookup
909 * . dlm_master_lookup RECOVER_MASTER (fix_master 1, from_master 0)
910 */
911
912int dlm_master_lookup(struct dlm_ls *ls, int from_nodeid, char *name, int len,
913 unsigned int flags, int *r_nodeid, int *result)
914{
915 struct dlm_rsb *r = NULL;
916 uint32_t hash, b;
917 int from_master = (flags & DLM_LU_RECOVER_DIR);
918 int fix_master = (flags & DLM_LU_RECOVER_MASTER);
919 int our_nodeid = dlm_our_nodeid();
920 int dir_nodeid, error, toss_list = 0;
921
922 if (len > DLM_RESNAME_MAXLEN)
923 return -EINVAL;
924
925 if (from_nodeid == our_nodeid) {
926 log_error(ls, "dlm_master_lookup from our_nodeid %d flags %x",
927 our_nodeid, flags);
928 return -EINVAL;
929 }
930
931 hash = jhash(name, len, 0);
932 b = hash & (ls->ls_rsbtbl_size - 1);
933
934 dir_nodeid = dlm_hash2nodeid(ls, hash);
935 if (dir_nodeid != our_nodeid) {
936 log_error(ls, "dlm_master_lookup from %d dir %d our %d h %x %d",
937 from_nodeid, dir_nodeid, our_nodeid, hash,
938 ls->ls_num_nodes);
939 *r_nodeid = -1;
940 return -EINVAL;
941 }
942
943 retry:
944 error = pre_rsb_struct(ls);
945 if (error < 0)
946 return error;
947
948 spin_lock(&ls->ls_rsbtbl[b].lock);
949 error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].keep, name, len, &r);
950 if (!error) {
951 /* because the rsb is active, we need to lock_rsb before
952 checking/changing re_master_nodeid */
953
954 hold_rsb(r);
955 spin_unlock(&ls->ls_rsbtbl[b].lock);
956 lock_rsb(r);
957 goto found;
958 }
959
960 error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].toss, name, len, &r);
961 if (error)
962 goto not_found;
963
964 /* because the rsb is inactive (on toss list), it's not refcounted
965 and lock_rsb is not used, but is protected by the rsbtbl lock */
966
967 toss_list = 1;
968 found:
969 if (r->res_dir_nodeid != our_nodeid) {
970 /* should not happen, but may as well fix it and carry on */
971 log_error(ls, "dlm_master_lookup res_dir %d our %d %s",
972 r->res_dir_nodeid, our_nodeid, r->res_name);
973 r->res_dir_nodeid = our_nodeid;
974 }
975
976 if (fix_master && dlm_is_removed(ls, r->res_master_nodeid)) {
977 /* Recovery uses this function to set a new master when
978 the previous master failed. Setting NEW_MASTER will
979 force dlm_recover_masters to call recover_master on this
980 rsb even though the res_nodeid is no longer removed. */
981
982 r->res_master_nodeid = from_nodeid;
983 r->res_nodeid = from_nodeid;
984 rsb_set_flag(r, RSB_NEW_MASTER);
985
986 if (toss_list) {
987 /* I don't think we should ever find it on toss list. */
988 log_error(ls, "dlm_master_lookup fix_master on toss");
989 dlm_dump_rsb(r);
990 }
991 }
992
993 if (from_master && (r->res_master_nodeid != from_nodeid)) {
994 /* this will happen if from_nodeid became master during
995 a previous recovery cycle, and we aborted the previous
996 cycle before recovering this master value */
997
998 log_limit(ls, "dlm_master_lookup from_master %d "
999 "master_nodeid %d res_nodeid %d first %x %s",
1000 from_nodeid, r->res_master_nodeid, r->res_nodeid,
1001 r->res_first_lkid, r->res_name);
1002
1003 if (r->res_master_nodeid == our_nodeid) {
1004 log_error(ls, "from_master %d our_master", from_nodeid);
1005 dlm_dump_rsb(r);
1006 dlm_send_rcom_lookup_dump(r, from_nodeid);
1007 goto out_found;
1008 }
1009
1010 r->res_master_nodeid = from_nodeid;
1011 r->res_nodeid = from_nodeid;
1012 rsb_set_flag(r, RSB_NEW_MASTER);
1013 }
1014
1015 if (!r->res_master_nodeid) {
1016 /* this will happen if recovery happens while we're looking
1017 up the master for this rsb */
1018
1019 log_debug(ls, "dlm_master_lookup master 0 to %d first %x %s",
1020 from_nodeid, r->res_first_lkid, r->res_name);
1021 r->res_master_nodeid = from_nodeid;
1022 r->res_nodeid = from_nodeid;
1023 }
1024
1025 if (!from_master && !fix_master &&
1026 (r->res_master_nodeid == from_nodeid)) {
1027 /* this can happen when the master sends remove, the dir node
1028 finds the rsb on the keep list and ignores the remove,
1029 and the former master sends a lookup */
1030
1031 log_limit(ls, "dlm_master_lookup from master %d flags %x "
1032 "first %x %s", from_nodeid, flags,
1033 r->res_first_lkid, r->res_name);
1034 }
1035
1036 out_found:
1037 *r_nodeid = r->res_master_nodeid;
1038 if (result)
1039 *result = DLM_LU_MATCH;
1040
1041 if (toss_list) {
1042 r->res_toss_time = jiffies;
1043 /* the rsb was inactive (on toss list) */
1044 spin_unlock(&ls->ls_rsbtbl[b].lock);
1045 } else {
1046 /* the rsb was active */
1047 unlock_rsb(r);
1048 put_rsb(r);
1049 }
1050 return 0;
1051
1052 not_found:
1053 error = get_rsb_struct(ls, name, len, &r);
1054 if (error == -EAGAIN) {
1055 spin_unlock(&ls->ls_rsbtbl[b].lock);
1056 goto retry;
1057 }
1058 if (error)
1059 goto out_unlock;
1060
1061 r->res_hash = hash;
1062 r->res_bucket = b;
1063 r->res_dir_nodeid = our_nodeid;
1064 r->res_master_nodeid = from_nodeid;
1065 r->res_nodeid = from_nodeid;
1066 kref_init(&r->res_ref);
1067 r->res_toss_time = jiffies;
1068
1069 error = rsb_insert(r, &ls->ls_rsbtbl[b].toss);
1070 if (error) {
1071 /* should never happen */
1072 dlm_free_rsb(r);
1073 spin_unlock(&ls->ls_rsbtbl[b].lock);
1074 goto retry;
1075 }
1076
1077 if (result)
1078 *result = DLM_LU_ADD;
1079 *r_nodeid = from_nodeid;
1080 error = 0;
1081 out_unlock:
1082 spin_unlock(&ls->ls_rsbtbl[b].lock);
1083 return error;
1084}
1085
David Teigland6d40c4a2012-04-23 16:36:01 -05001086static void dlm_dump_rsb_hash(struct dlm_ls *ls, uint32_t hash)
1087{
1088 struct rb_node *n;
1089 struct dlm_rsb *r;
1090 int i;
1091
1092 for (i = 0; i < ls->ls_rsbtbl_size; i++) {
1093 spin_lock(&ls->ls_rsbtbl[i].lock);
1094 for (n = rb_first(&ls->ls_rsbtbl[i].keep); n; n = rb_next(n)) {
1095 r = rb_entry(n, struct dlm_rsb, res_hashnode);
1096 if (r->res_hash == hash)
1097 dlm_dump_rsb(r);
1098 }
1099 spin_unlock(&ls->ls_rsbtbl[i].lock);
1100 }
1101}
1102
David Teiglandc04fecb2012-05-10 10:18:07 -05001103void dlm_dump_rsb_name(struct dlm_ls *ls, char *name, int len)
David Teiglande7fd4172006-01-18 09:30:29 +00001104{
David Teiglandc04fecb2012-05-10 10:18:07 -05001105 struct dlm_rsb *r = NULL;
1106 uint32_t hash, b;
1107 int error;
David Teiglande7fd4172006-01-18 09:30:29 +00001108
David Teiglandc04fecb2012-05-10 10:18:07 -05001109 hash = jhash(name, len, 0);
1110 b = hash & (ls->ls_rsbtbl_size - 1);
1111
1112 spin_lock(&ls->ls_rsbtbl[b].lock);
1113 error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].keep, name, len, &r);
1114 if (!error)
1115 goto out_dump;
1116
1117 error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].toss, name, len, &r);
1118 if (error)
1119 goto out;
1120 out_dump:
1121 dlm_dump_rsb(r);
1122 out:
1123 spin_unlock(&ls->ls_rsbtbl[b].lock);
David Teiglande7fd4172006-01-18 09:30:29 +00001124}
1125
1126static void toss_rsb(struct kref *kref)
1127{
1128 struct dlm_rsb *r = container_of(kref, struct dlm_rsb, res_ref);
1129 struct dlm_ls *ls = r->res_ls;
1130
1131 DLM_ASSERT(list_empty(&r->res_root_list), dlm_print_rsb(r););
1132 kref_init(&r->res_ref);
Bob Peterson9beb3bf2011-10-26 15:24:55 -05001133 rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[r->res_bucket].keep);
1134 rsb_insert(r, &ls->ls_rsbtbl[r->res_bucket].toss);
David Teiglande7fd4172006-01-18 09:30:29 +00001135 r->res_toss_time = jiffies;
David Teiglandf1172282013-01-07 11:03:42 -06001136 ls->ls_rsbtbl[r->res_bucket].flags |= DLM_RTF_SHRINK;
David Teiglande7fd4172006-01-18 09:30:29 +00001137 if (r->res_lvbptr) {
David Teigland52bda2b2007-11-07 09:06:49 -06001138 dlm_free_lvb(r->res_lvbptr);
David Teiglande7fd4172006-01-18 09:30:29 +00001139 r->res_lvbptr = NULL;
1140 }
1141}
1142
David Teiglande7fd4172006-01-18 09:30:29 +00001143/* See comment for unhold_lkb */
1144
1145static void unhold_rsb(struct dlm_rsb *r)
1146{
1147 int rv;
1148 rv = kref_put(&r->res_ref, toss_rsb);
David Teiglanda345da32006-08-18 11:54:25 -05001149 DLM_ASSERT(!rv, dlm_dump_rsb(r););
David Teiglande7fd4172006-01-18 09:30:29 +00001150}
1151
1152static void kill_rsb(struct kref *kref)
1153{
1154 struct dlm_rsb *r = container_of(kref, struct dlm_rsb, res_ref);
1155
1156 /* All work is done after the return from kref_put() so we
1157 can release the write_lock before the remove and free. */
1158
David Teiglanda345da32006-08-18 11:54:25 -05001159 DLM_ASSERT(list_empty(&r->res_lookup), dlm_dump_rsb(r););
1160 DLM_ASSERT(list_empty(&r->res_grantqueue), dlm_dump_rsb(r););
1161 DLM_ASSERT(list_empty(&r->res_convertqueue), dlm_dump_rsb(r););
1162 DLM_ASSERT(list_empty(&r->res_waitqueue), dlm_dump_rsb(r););
1163 DLM_ASSERT(list_empty(&r->res_root_list), dlm_dump_rsb(r););
1164 DLM_ASSERT(list_empty(&r->res_recover_list), dlm_dump_rsb(r););
David Teiglande7fd4172006-01-18 09:30:29 +00001165}
1166
1167/* Attaching/detaching lkb's from rsb's is for rsb reference counting.
1168 The rsb must exist as long as any lkb's for it do. */
1169
1170static void attach_lkb(struct dlm_rsb *r, struct dlm_lkb *lkb)
1171{
1172 hold_rsb(r);
1173 lkb->lkb_resource = r;
1174}
1175
1176static void detach_lkb(struct dlm_lkb *lkb)
1177{
1178 if (lkb->lkb_resource) {
1179 put_rsb(lkb->lkb_resource);
1180 lkb->lkb_resource = NULL;
1181 }
1182}
1183
1184static int create_lkb(struct dlm_ls *ls, struct dlm_lkb **lkb_ret)
1185{
David Teigland3d6aa672011-07-06 17:00:54 -05001186 struct dlm_lkb *lkb;
Tejun Heo2a86b3e2013-02-27 17:04:49 -08001187 int rv;
David Teiglande7fd4172006-01-18 09:30:29 +00001188
David Teigland52bda2b2007-11-07 09:06:49 -06001189 lkb = dlm_allocate_lkb(ls);
David Teiglande7fd4172006-01-18 09:30:29 +00001190 if (!lkb)
1191 return -ENOMEM;
1192
1193 lkb->lkb_nodeid = -1;
1194 lkb->lkb_grmode = DLM_LOCK_IV;
1195 kref_init(&lkb->lkb_ref);
David Teigland34e22be2006-07-18 11:24:04 -05001196 INIT_LIST_HEAD(&lkb->lkb_ownqueue);
David Teiglandef0c2bb2007-03-28 09:56:46 -05001197 INIT_LIST_HEAD(&lkb->lkb_rsb_lookup);
David Teigland3ae1acf2007-05-18 08:59:31 -05001198 INIT_LIST_HEAD(&lkb->lkb_time_list);
David Teigland23e8e1a2011-04-05 13:16:24 -05001199 INIT_LIST_HEAD(&lkb->lkb_cb_list);
1200 mutex_init(&lkb->lkb_cb_mutex);
1201 INIT_WORK(&lkb->lkb_cb_work, dlm_callback_work);
David Teiglande7fd4172006-01-18 09:30:29 +00001202
Tejun Heo2a86b3e2013-02-27 17:04:49 -08001203 idr_preload(GFP_NOFS);
David Teigland3d6aa672011-07-06 17:00:54 -05001204 spin_lock(&ls->ls_lkbidr_spin);
Tejun Heo2a86b3e2013-02-27 17:04:49 -08001205 rv = idr_alloc(&ls->ls_lkbidr, lkb, 1, 0, GFP_NOWAIT);
1206 if (rv >= 0)
1207 lkb->lkb_id = rv;
David Teigland3d6aa672011-07-06 17:00:54 -05001208 spin_unlock(&ls->ls_lkbidr_spin);
Tejun Heo2a86b3e2013-02-27 17:04:49 -08001209 idr_preload_end();
David Teiglande7fd4172006-01-18 09:30:29 +00001210
David Teigland3d6aa672011-07-06 17:00:54 -05001211 if (rv < 0) {
1212 log_error(ls, "create_lkb idr error %d", rv);
1213 return rv;
David Teiglande7fd4172006-01-18 09:30:29 +00001214 }
1215
David Teiglande7fd4172006-01-18 09:30:29 +00001216 *lkb_ret = lkb;
1217 return 0;
1218}
1219
David Teiglande7fd4172006-01-18 09:30:29 +00001220static int find_lkb(struct dlm_ls *ls, uint32_t lkid, struct dlm_lkb **lkb_ret)
1221{
1222 struct dlm_lkb *lkb;
David Teiglande7fd4172006-01-18 09:30:29 +00001223
David Teigland3d6aa672011-07-06 17:00:54 -05001224 spin_lock(&ls->ls_lkbidr_spin);
1225 lkb = idr_find(&ls->ls_lkbidr, lkid);
David Teiglande7fd4172006-01-18 09:30:29 +00001226 if (lkb)
1227 kref_get(&lkb->lkb_ref);
David Teigland3d6aa672011-07-06 17:00:54 -05001228 spin_unlock(&ls->ls_lkbidr_spin);
David Teiglande7fd4172006-01-18 09:30:29 +00001229
1230 *lkb_ret = lkb;
1231 return lkb ? 0 : -ENOENT;
1232}
1233
1234static void kill_lkb(struct kref *kref)
1235{
1236 struct dlm_lkb *lkb = container_of(kref, struct dlm_lkb, lkb_ref);
1237
1238 /* All work is done after the return from kref_put() so we
1239 can release the write_lock before the detach_lkb */
1240
1241 DLM_ASSERT(!lkb->lkb_status, dlm_print_lkb(lkb););
1242}
1243
David Teiglandb3f58d82006-02-28 11:16:37 -05001244/* __put_lkb() is used when an lkb may not have an rsb attached to
1245 it so we need to provide the lockspace explicitly */
1246
1247static int __put_lkb(struct dlm_ls *ls, struct dlm_lkb *lkb)
David Teiglande7fd4172006-01-18 09:30:29 +00001248{
David Teigland3d6aa672011-07-06 17:00:54 -05001249 uint32_t lkid = lkb->lkb_id;
David Teiglande7fd4172006-01-18 09:30:29 +00001250
David Teigland3d6aa672011-07-06 17:00:54 -05001251 spin_lock(&ls->ls_lkbidr_spin);
David Teiglande7fd4172006-01-18 09:30:29 +00001252 if (kref_put(&lkb->lkb_ref, kill_lkb)) {
David Teigland3d6aa672011-07-06 17:00:54 -05001253 idr_remove(&ls->ls_lkbidr, lkid);
1254 spin_unlock(&ls->ls_lkbidr_spin);
David Teiglande7fd4172006-01-18 09:30:29 +00001255
1256 detach_lkb(lkb);
1257
1258 /* for local/process lkbs, lvbptr points to caller's lksb */
1259 if (lkb->lkb_lvbptr && is_master_copy(lkb))
David Teigland52bda2b2007-11-07 09:06:49 -06001260 dlm_free_lvb(lkb->lkb_lvbptr);
1261 dlm_free_lkb(lkb);
David Teiglande7fd4172006-01-18 09:30:29 +00001262 return 1;
1263 } else {
David Teigland3d6aa672011-07-06 17:00:54 -05001264 spin_unlock(&ls->ls_lkbidr_spin);
David Teiglande7fd4172006-01-18 09:30:29 +00001265 return 0;
1266 }
1267}
1268
1269int dlm_put_lkb(struct dlm_lkb *lkb)
1270{
David Teiglandb3f58d82006-02-28 11:16:37 -05001271 struct dlm_ls *ls;
1272
1273 DLM_ASSERT(lkb->lkb_resource, dlm_print_lkb(lkb););
1274 DLM_ASSERT(lkb->lkb_resource->res_ls, dlm_print_lkb(lkb););
1275
1276 ls = lkb->lkb_resource->res_ls;
1277 return __put_lkb(ls, lkb);
David Teiglande7fd4172006-01-18 09:30:29 +00001278}
1279
1280/* This is only called to add a reference when the code already holds
1281 a valid reference to the lkb, so there's no need for locking. */
1282
1283static inline void hold_lkb(struct dlm_lkb *lkb)
1284{
1285 kref_get(&lkb->lkb_ref);
1286}
1287
1288/* This is called when we need to remove a reference and are certain
1289 it's not the last ref. e.g. del_lkb is always called between a
1290 find_lkb/put_lkb and is always the inverse of a previous add_lkb.
1291 put_lkb would work fine, but would involve unnecessary locking */
1292
1293static inline void unhold_lkb(struct dlm_lkb *lkb)
1294{
1295 int rv;
1296 rv = kref_put(&lkb->lkb_ref, kill_lkb);
1297 DLM_ASSERT(!rv, dlm_print_lkb(lkb););
1298}
1299
1300static void lkb_add_ordered(struct list_head *new, struct list_head *head,
1301 int mode)
1302{
1303 struct dlm_lkb *lkb = NULL;
1304
1305 list_for_each_entry(lkb, head, lkb_statequeue)
1306 if (lkb->lkb_rqmode < mode)
1307 break;
1308
Dan Carpenter99fb19d2010-03-22 15:03:54 +03001309 __list_add(new, lkb->lkb_statequeue.prev, &lkb->lkb_statequeue);
David Teiglande7fd4172006-01-18 09:30:29 +00001310}
1311
1312/* add/remove lkb to rsb's grant/convert/wait queue */
1313
1314static void add_lkb(struct dlm_rsb *r, struct dlm_lkb *lkb, int status)
1315{
1316 kref_get(&lkb->lkb_ref);
1317
1318 DLM_ASSERT(!lkb->lkb_status, dlm_print_lkb(lkb););
1319
David Teiglandeeda4182008-12-09 14:12:21 -06001320 lkb->lkb_timestamp = ktime_get();
1321
David Teiglande7fd4172006-01-18 09:30:29 +00001322 lkb->lkb_status = status;
1323
1324 switch (status) {
1325 case DLM_LKSTS_WAITING:
1326 if (lkb->lkb_exflags & DLM_LKF_HEADQUE)
1327 list_add(&lkb->lkb_statequeue, &r->res_waitqueue);
1328 else
1329 list_add_tail(&lkb->lkb_statequeue, &r->res_waitqueue);
1330 break;
1331 case DLM_LKSTS_GRANTED:
1332 /* convention says granted locks kept in order of grmode */
1333 lkb_add_ordered(&lkb->lkb_statequeue, &r->res_grantqueue,
1334 lkb->lkb_grmode);
1335 break;
1336 case DLM_LKSTS_CONVERT:
1337 if (lkb->lkb_exflags & DLM_LKF_HEADQUE)
1338 list_add(&lkb->lkb_statequeue, &r->res_convertqueue);
1339 else
1340 list_add_tail(&lkb->lkb_statequeue,
1341 &r->res_convertqueue);
1342 break;
1343 default:
1344 DLM_ASSERT(0, dlm_print_lkb(lkb); printk("sts=%d\n", status););
1345 }
1346}
1347
1348static void del_lkb(struct dlm_rsb *r, struct dlm_lkb *lkb)
1349{
1350 lkb->lkb_status = 0;
1351 list_del(&lkb->lkb_statequeue);
1352 unhold_lkb(lkb);
1353}
1354
1355static void move_lkb(struct dlm_rsb *r, struct dlm_lkb *lkb, int sts)
1356{
1357 hold_lkb(lkb);
1358 del_lkb(r, lkb);
1359 add_lkb(r, lkb, sts);
1360 unhold_lkb(lkb);
1361}
1362
David Teiglandef0c2bb2007-03-28 09:56:46 -05001363static int msg_reply_type(int mstype)
1364{
1365 switch (mstype) {
1366 case DLM_MSG_REQUEST:
1367 return DLM_MSG_REQUEST_REPLY;
1368 case DLM_MSG_CONVERT:
1369 return DLM_MSG_CONVERT_REPLY;
1370 case DLM_MSG_UNLOCK:
1371 return DLM_MSG_UNLOCK_REPLY;
1372 case DLM_MSG_CANCEL:
1373 return DLM_MSG_CANCEL_REPLY;
1374 case DLM_MSG_LOOKUP:
1375 return DLM_MSG_LOOKUP_REPLY;
1376 }
1377 return -1;
1378}
1379
David Teiglandc6ff6692011-03-28 14:17:26 -05001380static int nodeid_warned(int nodeid, int num_nodes, int *warned)
1381{
1382 int i;
1383
1384 for (i = 0; i < num_nodes; i++) {
1385 if (!warned[i]) {
1386 warned[i] = nodeid;
1387 return 0;
1388 }
1389 if (warned[i] == nodeid)
1390 return 1;
1391 }
1392 return 0;
1393}
1394
1395void dlm_scan_waiters(struct dlm_ls *ls)
1396{
1397 struct dlm_lkb *lkb;
1398 ktime_t zero = ktime_set(0, 0);
1399 s64 us;
1400 s64 debug_maxus = 0;
1401 u32 debug_scanned = 0;
1402 u32 debug_expired = 0;
1403 int num_nodes = 0;
1404 int *warned = NULL;
1405
1406 if (!dlm_config.ci_waitwarn_us)
1407 return;
1408
1409 mutex_lock(&ls->ls_waiters_mutex);
1410
1411 list_for_each_entry(lkb, &ls->ls_waiters, lkb_wait_reply) {
1412 if (ktime_equal(lkb->lkb_wait_time, zero))
1413 continue;
1414
1415 debug_scanned++;
1416
1417 us = ktime_to_us(ktime_sub(ktime_get(), lkb->lkb_wait_time));
1418
1419 if (us < dlm_config.ci_waitwarn_us)
1420 continue;
1421
1422 lkb->lkb_wait_time = zero;
1423
1424 debug_expired++;
1425 if (us > debug_maxus)
1426 debug_maxus = us;
1427
1428 if (!num_nodes) {
1429 num_nodes = ls->ls_num_nodes;
Jesper Juhl5d708282011-07-10 22:54:31 +02001430 warned = kzalloc(num_nodes * sizeof(int), GFP_KERNEL);
David Teiglandc6ff6692011-03-28 14:17:26 -05001431 }
1432 if (!warned)
1433 continue;
1434 if (nodeid_warned(lkb->lkb_wait_nodeid, num_nodes, warned))
1435 continue;
1436
1437 log_error(ls, "waitwarn %x %lld %d us check connection to "
1438 "node %d", lkb->lkb_id, (long long)us,
1439 dlm_config.ci_waitwarn_us, lkb->lkb_wait_nodeid);
1440 }
1441 mutex_unlock(&ls->ls_waiters_mutex);
Jesper Juhl5d708282011-07-10 22:54:31 +02001442 kfree(warned);
David Teiglandc6ff6692011-03-28 14:17:26 -05001443
1444 if (debug_expired)
1445 log_debug(ls, "scan_waiters %u warn %u over %d us max %lld us",
1446 debug_scanned, debug_expired,
1447 dlm_config.ci_waitwarn_us, (long long)debug_maxus);
1448}
1449
David Teiglande7fd4172006-01-18 09:30:29 +00001450/* add/remove lkb from global waiters list of lkb's waiting for
1451 a reply from a remote node */
1452
David Teiglandc6ff6692011-03-28 14:17:26 -05001453static int add_to_waiters(struct dlm_lkb *lkb, int mstype, int to_nodeid)
David Teiglande7fd4172006-01-18 09:30:29 +00001454{
1455 struct dlm_ls *ls = lkb->lkb_resource->res_ls;
David Teiglandef0c2bb2007-03-28 09:56:46 -05001456 int error = 0;
David Teiglande7fd4172006-01-18 09:30:29 +00001457
David Teigland90135922006-01-20 08:47:07 +00001458 mutex_lock(&ls->ls_waiters_mutex);
David Teiglandef0c2bb2007-03-28 09:56:46 -05001459
1460 if (is_overlap_unlock(lkb) ||
1461 (is_overlap_cancel(lkb) && (mstype == DLM_MSG_CANCEL))) {
1462 error = -EINVAL;
David Teiglande7fd4172006-01-18 09:30:29 +00001463 goto out;
1464 }
David Teiglandef0c2bb2007-03-28 09:56:46 -05001465
1466 if (lkb->lkb_wait_type || is_overlap_cancel(lkb)) {
1467 switch (mstype) {
1468 case DLM_MSG_UNLOCK:
1469 lkb->lkb_flags |= DLM_IFL_OVERLAP_UNLOCK;
1470 break;
1471 case DLM_MSG_CANCEL:
1472 lkb->lkb_flags |= DLM_IFL_OVERLAP_CANCEL;
1473 break;
1474 default:
1475 error = -EBUSY;
1476 goto out;
1477 }
1478 lkb->lkb_wait_count++;
1479 hold_lkb(lkb);
1480
David Teigland43279e52009-01-28 14:37:54 -06001481 log_debug(ls, "addwait %x cur %d overlap %d count %d f %x",
David Teiglandef0c2bb2007-03-28 09:56:46 -05001482 lkb->lkb_id, lkb->lkb_wait_type, mstype,
1483 lkb->lkb_wait_count, lkb->lkb_flags);
1484 goto out;
1485 }
1486
1487 DLM_ASSERT(!lkb->lkb_wait_count,
1488 dlm_print_lkb(lkb);
1489 printk("wait_count %d\n", lkb->lkb_wait_count););
1490
1491 lkb->lkb_wait_count++;
David Teiglande7fd4172006-01-18 09:30:29 +00001492 lkb->lkb_wait_type = mstype;
David Teiglandc6ff6692011-03-28 14:17:26 -05001493 lkb->lkb_wait_time = ktime_get();
1494 lkb->lkb_wait_nodeid = to_nodeid; /* for debugging */
David Teiglandef0c2bb2007-03-28 09:56:46 -05001495 hold_lkb(lkb);
David Teiglande7fd4172006-01-18 09:30:29 +00001496 list_add(&lkb->lkb_wait_reply, &ls->ls_waiters);
1497 out:
David Teiglandef0c2bb2007-03-28 09:56:46 -05001498 if (error)
David Teigland43279e52009-01-28 14:37:54 -06001499 log_error(ls, "addwait error %x %d flags %x %d %d %s",
David Teiglandef0c2bb2007-03-28 09:56:46 -05001500 lkb->lkb_id, error, lkb->lkb_flags, mstype,
1501 lkb->lkb_wait_type, lkb->lkb_resource->res_name);
David Teigland90135922006-01-20 08:47:07 +00001502 mutex_unlock(&ls->ls_waiters_mutex);
David Teiglandef0c2bb2007-03-28 09:56:46 -05001503 return error;
David Teiglande7fd4172006-01-18 09:30:29 +00001504}
1505
David Teiglandb790c3b2007-01-24 10:21:33 -06001506/* We clear the RESEND flag because we might be taking an lkb off the waiters
1507 list as part of process_requestqueue (e.g. a lookup that has an optimized
1508 request reply on the requestqueue) between dlm_recover_waiters_pre() which
1509 set RESEND and dlm_recover_waiters_post() */
1510
David Teigland43279e52009-01-28 14:37:54 -06001511static int _remove_from_waiters(struct dlm_lkb *lkb, int mstype,
1512 struct dlm_message *ms)
David Teiglande7fd4172006-01-18 09:30:29 +00001513{
David Teiglandef0c2bb2007-03-28 09:56:46 -05001514 struct dlm_ls *ls = lkb->lkb_resource->res_ls;
1515 int overlap_done = 0;
David Teiglande7fd4172006-01-18 09:30:29 +00001516
David Teiglandef0c2bb2007-03-28 09:56:46 -05001517 if (is_overlap_unlock(lkb) && (mstype == DLM_MSG_UNLOCK_REPLY)) {
David Teigland43279e52009-01-28 14:37:54 -06001518 log_debug(ls, "remwait %x unlock_reply overlap", lkb->lkb_id);
David Teiglandef0c2bb2007-03-28 09:56:46 -05001519 lkb->lkb_flags &= ~DLM_IFL_OVERLAP_UNLOCK;
1520 overlap_done = 1;
1521 goto out_del;
David Teiglande7fd4172006-01-18 09:30:29 +00001522 }
David Teiglandef0c2bb2007-03-28 09:56:46 -05001523
1524 if (is_overlap_cancel(lkb) && (mstype == DLM_MSG_CANCEL_REPLY)) {
David Teigland43279e52009-01-28 14:37:54 -06001525 log_debug(ls, "remwait %x cancel_reply overlap", lkb->lkb_id);
David Teiglandef0c2bb2007-03-28 09:56:46 -05001526 lkb->lkb_flags &= ~DLM_IFL_OVERLAP_CANCEL;
1527 overlap_done = 1;
1528 goto out_del;
1529 }
1530
David Teigland43279e52009-01-28 14:37:54 -06001531 /* Cancel state was preemptively cleared by a successful convert,
1532 see next comment, nothing to do. */
1533
1534 if ((mstype == DLM_MSG_CANCEL_REPLY) &&
1535 (lkb->lkb_wait_type != DLM_MSG_CANCEL)) {
1536 log_debug(ls, "remwait %x cancel_reply wait_type %d",
1537 lkb->lkb_id, lkb->lkb_wait_type);
1538 return -1;
1539 }
1540
1541 /* Remove for the convert reply, and premptively remove for the
1542 cancel reply. A convert has been granted while there's still
1543 an outstanding cancel on it (the cancel is moot and the result
1544 in the cancel reply should be 0). We preempt the cancel reply
1545 because the app gets the convert result and then can follow up
1546 with another op, like convert. This subsequent op would see the
1547 lingering state of the cancel and fail with -EBUSY. */
1548
1549 if ((mstype == DLM_MSG_CONVERT_REPLY) &&
1550 (lkb->lkb_wait_type == DLM_MSG_CONVERT) &&
1551 is_overlap_cancel(lkb) && ms && !ms->m_result) {
1552 log_debug(ls, "remwait %x convert_reply zap overlap_cancel",
1553 lkb->lkb_id);
1554 lkb->lkb_wait_type = 0;
1555 lkb->lkb_flags &= ~DLM_IFL_OVERLAP_CANCEL;
1556 lkb->lkb_wait_count--;
1557 goto out_del;
1558 }
1559
David Teiglandef0c2bb2007-03-28 09:56:46 -05001560 /* N.B. type of reply may not always correspond to type of original
1561 msg due to lookup->request optimization, verify others? */
1562
1563 if (lkb->lkb_wait_type) {
1564 lkb->lkb_wait_type = 0;
1565 goto out_del;
1566 }
1567
David Teigland6d40c4a2012-04-23 16:36:01 -05001568 log_error(ls, "remwait error %x remote %d %x msg %d flags %x no wait",
1569 lkb->lkb_id, ms ? ms->m_header.h_nodeid : 0, lkb->lkb_remid,
1570 mstype, lkb->lkb_flags);
David Teiglandef0c2bb2007-03-28 09:56:46 -05001571 return -1;
1572
1573 out_del:
1574 /* the force-unlock/cancel has completed and we haven't recvd a reply
1575 to the op that was in progress prior to the unlock/cancel; we
1576 give up on any reply to the earlier op. FIXME: not sure when/how
1577 this would happen */
1578
1579 if (overlap_done && lkb->lkb_wait_type) {
David Teigland43279e52009-01-28 14:37:54 -06001580 log_error(ls, "remwait error %x reply %d wait_type %d overlap",
David Teiglandef0c2bb2007-03-28 09:56:46 -05001581 lkb->lkb_id, mstype, lkb->lkb_wait_type);
1582 lkb->lkb_wait_count--;
1583 lkb->lkb_wait_type = 0;
1584 }
1585
1586 DLM_ASSERT(lkb->lkb_wait_count, dlm_print_lkb(lkb););
1587
David Teiglandb790c3b2007-01-24 10:21:33 -06001588 lkb->lkb_flags &= ~DLM_IFL_RESEND;
David Teiglandef0c2bb2007-03-28 09:56:46 -05001589 lkb->lkb_wait_count--;
1590 if (!lkb->lkb_wait_count)
1591 list_del_init(&lkb->lkb_wait_reply);
David Teiglande7fd4172006-01-18 09:30:29 +00001592 unhold_lkb(lkb);
David Teiglandef0c2bb2007-03-28 09:56:46 -05001593 return 0;
David Teiglande7fd4172006-01-18 09:30:29 +00001594}
1595
David Teiglandef0c2bb2007-03-28 09:56:46 -05001596static int remove_from_waiters(struct dlm_lkb *lkb, int mstype)
David Teiglande7fd4172006-01-18 09:30:29 +00001597{
1598 struct dlm_ls *ls = lkb->lkb_resource->res_ls;
1599 int error;
1600
David Teigland90135922006-01-20 08:47:07 +00001601 mutex_lock(&ls->ls_waiters_mutex);
David Teigland43279e52009-01-28 14:37:54 -06001602 error = _remove_from_waiters(lkb, mstype, NULL);
David Teigland90135922006-01-20 08:47:07 +00001603 mutex_unlock(&ls->ls_waiters_mutex);
David Teiglande7fd4172006-01-18 09:30:29 +00001604 return error;
1605}
1606
David Teiglandef0c2bb2007-03-28 09:56:46 -05001607/* Handles situations where we might be processing a "fake" or "stub" reply in
1608 which we can't try to take waiters_mutex again. */
1609
1610static int remove_from_waiters_ms(struct dlm_lkb *lkb, struct dlm_message *ms)
1611{
1612 struct dlm_ls *ls = lkb->lkb_resource->res_ls;
1613 int error;
1614
David Teigland2a7ce0e2011-04-04 15:19:59 -05001615 if (ms->m_flags != DLM_IFL_STUB_MS)
David Teiglandef0c2bb2007-03-28 09:56:46 -05001616 mutex_lock(&ls->ls_waiters_mutex);
David Teigland43279e52009-01-28 14:37:54 -06001617 error = _remove_from_waiters(lkb, ms->m_type, ms);
David Teigland2a7ce0e2011-04-04 15:19:59 -05001618 if (ms->m_flags != DLM_IFL_STUB_MS)
David Teiglandef0c2bb2007-03-28 09:56:46 -05001619 mutex_unlock(&ls->ls_waiters_mutex);
1620 return error;
1621}
1622
David Teigland05c32f42012-06-14 12:17:32 -05001623/* If there's an rsb for the same resource being removed, ensure
1624 that the remove message is sent before the new lookup message.
1625 It should be rare to need a delay here, but if not, then it may
1626 be worthwhile to add a proper wait mechanism rather than a delay. */
David Teiglande7fd4172006-01-18 09:30:29 +00001627
David Teigland05c32f42012-06-14 12:17:32 -05001628static void wait_pending_remove(struct dlm_rsb *r)
David Teiglande7fd4172006-01-18 09:30:29 +00001629{
David Teigland05c32f42012-06-14 12:17:32 -05001630 struct dlm_ls *ls = r->res_ls;
1631 restart:
1632 spin_lock(&ls->ls_remove_spin);
1633 if (ls->ls_remove_len &&
1634 !rsb_cmp(r, ls->ls_remove_name, ls->ls_remove_len)) {
1635 log_debug(ls, "delay lookup for remove dir %d %s",
1636 r->res_dir_nodeid, r->res_name);
1637 spin_unlock(&ls->ls_remove_spin);
1638 msleep(1);
1639 goto restart;
1640 }
1641 spin_unlock(&ls->ls_remove_spin);
1642}
1643
1644/*
1645 * ls_remove_spin protects ls_remove_name and ls_remove_len which are
1646 * read by other threads in wait_pending_remove. ls_remove_names
1647 * and ls_remove_lens are only used by the scan thread, so they do
1648 * not need protection.
1649 */
1650
1651static void shrink_bucket(struct dlm_ls *ls, int b)
1652{
1653 struct rb_node *n, *next;
David Teiglande7fd4172006-01-18 09:30:29 +00001654 struct dlm_rsb *r;
David Teigland05c32f42012-06-14 12:17:32 -05001655 char *name;
David Teiglandc04fecb2012-05-10 10:18:07 -05001656 int our_nodeid = dlm_our_nodeid();
David Teigland05c32f42012-06-14 12:17:32 -05001657 int remote_count = 0;
David Teiglandf1172282013-01-07 11:03:42 -06001658 int need_shrink = 0;
David Teigland05c32f42012-06-14 12:17:32 -05001659 int i, len, rv;
David Teiglande7fd4172006-01-18 09:30:29 +00001660
David Teigland05c32f42012-06-14 12:17:32 -05001661 memset(&ls->ls_remove_lens, 0, sizeof(int) * DLM_REMOVE_NAMES_MAX);
David Teiglandc04fecb2012-05-10 10:18:07 -05001662
David Teigland05c32f42012-06-14 12:17:32 -05001663 spin_lock(&ls->ls_rsbtbl[b].lock);
David Teiglandf1172282013-01-07 11:03:42 -06001664
1665 if (!(ls->ls_rsbtbl[b].flags & DLM_RTF_SHRINK)) {
1666 spin_unlock(&ls->ls_rsbtbl[b].lock);
1667 return;
1668 }
1669
David Teigland05c32f42012-06-14 12:17:32 -05001670 for (n = rb_first(&ls->ls_rsbtbl[b].toss); n; n = next) {
1671 next = rb_next(n);
1672 r = rb_entry(n, struct dlm_rsb, res_hashnode);
David Teiglandc04fecb2012-05-10 10:18:07 -05001673
David Teigland05c32f42012-06-14 12:17:32 -05001674 /* If we're the directory record for this rsb, and
1675 we're not the master of it, then we need to wait
1676 for the master node to send us a dir remove for
1677 before removing the dir record. */
David Teiglandc04fecb2012-05-10 10:18:07 -05001678
David Teigland05c32f42012-06-14 12:17:32 -05001679 if (!dlm_no_directory(ls) &&
1680 (r->res_master_nodeid != our_nodeid) &&
1681 (dlm_dir_nodeid(r) == our_nodeid)) {
1682 continue;
David Teiglande7fd4172006-01-18 09:30:29 +00001683 }
1684
David Teiglandf1172282013-01-07 11:03:42 -06001685 need_shrink = 1;
1686
David Teigland05c32f42012-06-14 12:17:32 -05001687 if (!time_after_eq(jiffies, r->res_toss_time +
1688 dlm_config.ci_toss_secs * HZ)) {
1689 continue;
David Teiglande7fd4172006-01-18 09:30:29 +00001690 }
1691
David Teigland05c32f42012-06-14 12:17:32 -05001692 if (!dlm_no_directory(ls) &&
1693 (r->res_master_nodeid == our_nodeid) &&
1694 (dlm_dir_nodeid(r) != our_nodeid)) {
David Teiglande7fd4172006-01-18 09:30:29 +00001695
David Teiglandc04fecb2012-05-10 10:18:07 -05001696 /* We're the master of this rsb but we're not
1697 the directory record, so we need to tell the
1698 dir node to remove the dir record. */
1699
David Teigland05c32f42012-06-14 12:17:32 -05001700 ls->ls_remove_lens[remote_count] = r->res_length;
1701 memcpy(ls->ls_remove_names[remote_count], r->res_name,
1702 DLM_RESNAME_MAXLEN);
1703 remote_count++;
David Teiglandc04fecb2012-05-10 10:18:07 -05001704
David Teigland05c32f42012-06-14 12:17:32 -05001705 if (remote_count >= DLM_REMOVE_NAMES_MAX)
1706 break;
1707 continue;
David Teiglande7fd4172006-01-18 09:30:29 +00001708 }
David Teiglande7fd4172006-01-18 09:30:29 +00001709
David Teigland05c32f42012-06-14 12:17:32 -05001710 if (!kref_put(&r->res_ref, kill_rsb)) {
1711 log_error(ls, "tossed rsb in use %s", r->res_name);
1712 continue;
1713 }
1714
1715 rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[b].toss);
1716 dlm_free_rsb(r);
1717 }
David Teiglandf1172282013-01-07 11:03:42 -06001718
1719 if (need_shrink)
1720 ls->ls_rsbtbl[b].flags |= DLM_RTF_SHRINK;
1721 else
1722 ls->ls_rsbtbl[b].flags &= ~DLM_RTF_SHRINK;
David Teigland05c32f42012-06-14 12:17:32 -05001723 spin_unlock(&ls->ls_rsbtbl[b].lock);
1724
1725 /*
1726 * While searching for rsb's to free, we found some that require
1727 * remote removal. We leave them in place and find them again here
1728 * so there is a very small gap between removing them from the toss
1729 * list and sending the removal. Keeping this gap small is
1730 * important to keep us (the master node) from being out of sync
1731 * with the remote dir node for very long.
1732 *
1733 * From the time the rsb is removed from toss until just after
1734 * send_remove, the rsb name is saved in ls_remove_name. A new
1735 * lookup checks this to ensure that a new lookup message for the
1736 * same resource name is not sent just before the remove message.
1737 */
1738
1739 for (i = 0; i < remote_count; i++) {
1740 name = ls->ls_remove_names[i];
1741 len = ls->ls_remove_lens[i];
1742
1743 spin_lock(&ls->ls_rsbtbl[b].lock);
1744 rv = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].toss, name, len, &r);
1745 if (rv) {
1746 spin_unlock(&ls->ls_rsbtbl[b].lock);
1747 log_debug(ls, "remove_name not toss %s", name);
1748 continue;
1749 }
1750
1751 if (r->res_master_nodeid != our_nodeid) {
1752 spin_unlock(&ls->ls_rsbtbl[b].lock);
1753 log_debug(ls, "remove_name master %d dir %d our %d %s",
1754 r->res_master_nodeid, r->res_dir_nodeid,
1755 our_nodeid, name);
1756 continue;
1757 }
1758
1759 if (r->res_dir_nodeid == our_nodeid) {
1760 /* should never happen */
1761 spin_unlock(&ls->ls_rsbtbl[b].lock);
1762 log_error(ls, "remove_name dir %d master %d our %d %s",
1763 r->res_dir_nodeid, r->res_master_nodeid,
1764 our_nodeid, name);
1765 continue;
1766 }
1767
1768 if (!time_after_eq(jiffies, r->res_toss_time +
1769 dlm_config.ci_toss_secs * HZ)) {
1770 spin_unlock(&ls->ls_rsbtbl[b].lock);
1771 log_debug(ls, "remove_name toss_time %lu now %lu %s",
1772 r->res_toss_time, jiffies, name);
1773 continue;
1774 }
1775
1776 if (!kref_put(&r->res_ref, kill_rsb)) {
1777 spin_unlock(&ls->ls_rsbtbl[b].lock);
1778 log_error(ls, "remove_name in use %s", name);
1779 continue;
1780 }
1781
1782 rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[b].toss);
1783
1784 /* block lookup of same name until we've sent remove */
1785 spin_lock(&ls->ls_remove_spin);
1786 ls->ls_remove_len = len;
1787 memcpy(ls->ls_remove_name, name, DLM_RESNAME_MAXLEN);
1788 spin_unlock(&ls->ls_remove_spin);
1789 spin_unlock(&ls->ls_rsbtbl[b].lock);
1790
1791 send_remove(r);
1792
1793 /* allow lookup of name again */
1794 spin_lock(&ls->ls_remove_spin);
1795 ls->ls_remove_len = 0;
1796 memset(ls->ls_remove_name, 0, DLM_RESNAME_MAXLEN);
1797 spin_unlock(&ls->ls_remove_spin);
1798
1799 dlm_free_rsb(r);
1800 }
David Teiglande7fd4172006-01-18 09:30:29 +00001801}
1802
1803void dlm_scan_rsbs(struct dlm_ls *ls)
1804{
1805 int i;
1806
David Teiglande7fd4172006-01-18 09:30:29 +00001807 for (i = 0; i < ls->ls_rsbtbl_size; i++) {
1808 shrink_bucket(ls, i);
David Teigland85e86ed2007-05-18 08:58:15 -05001809 if (dlm_locking_stopped(ls))
1810 break;
David Teiglande7fd4172006-01-18 09:30:29 +00001811 cond_resched();
1812 }
1813}
1814
David Teigland3ae1acf2007-05-18 08:59:31 -05001815static void add_timeout(struct dlm_lkb *lkb)
1816{
1817 struct dlm_ls *ls = lkb->lkb_resource->res_ls;
1818
David Teiglandeeda4182008-12-09 14:12:21 -06001819 if (is_master_copy(lkb))
David Teigland3ae1acf2007-05-18 08:59:31 -05001820 return;
David Teigland3ae1acf2007-05-18 08:59:31 -05001821
1822 if (test_bit(LSFL_TIMEWARN, &ls->ls_flags) &&
1823 !(lkb->lkb_exflags & DLM_LKF_NODLCKWT)) {
1824 lkb->lkb_flags |= DLM_IFL_WATCH_TIMEWARN;
1825 goto add_it;
1826 }
David Teigland84d8cd62007-05-29 08:44:23 -05001827 if (lkb->lkb_exflags & DLM_LKF_TIMEOUT)
1828 goto add_it;
David Teigland3ae1acf2007-05-18 08:59:31 -05001829 return;
1830
1831 add_it:
1832 DLM_ASSERT(list_empty(&lkb->lkb_time_list), dlm_print_lkb(lkb););
1833 mutex_lock(&ls->ls_timeout_mutex);
1834 hold_lkb(lkb);
David Teigland3ae1acf2007-05-18 08:59:31 -05001835 list_add_tail(&lkb->lkb_time_list, &ls->ls_timeout);
1836 mutex_unlock(&ls->ls_timeout_mutex);
1837}
1838
1839static void del_timeout(struct dlm_lkb *lkb)
1840{
1841 struct dlm_ls *ls = lkb->lkb_resource->res_ls;
1842
1843 mutex_lock(&ls->ls_timeout_mutex);
1844 if (!list_empty(&lkb->lkb_time_list)) {
1845 list_del_init(&lkb->lkb_time_list);
1846 unhold_lkb(lkb);
1847 }
1848 mutex_unlock(&ls->ls_timeout_mutex);
1849}
1850
1851/* FIXME: is it safe to look at lkb_exflags, lkb_flags, lkb_timestamp, and
1852 lkb_lksb_timeout without lock_rsb? Note: we can't lock timeout_mutex
1853 and then lock rsb because of lock ordering in add_timeout. We may need
1854 to specify some special timeout-related bits in the lkb that are just to
1855 be accessed under the timeout_mutex. */
1856
1857void dlm_scan_timeout(struct dlm_ls *ls)
1858{
1859 struct dlm_rsb *r;
1860 struct dlm_lkb *lkb;
1861 int do_cancel, do_warn;
David Teiglandeeda4182008-12-09 14:12:21 -06001862 s64 wait_us;
David Teigland3ae1acf2007-05-18 08:59:31 -05001863
1864 for (;;) {
1865 if (dlm_locking_stopped(ls))
1866 break;
1867
1868 do_cancel = 0;
1869 do_warn = 0;
1870 mutex_lock(&ls->ls_timeout_mutex);
1871 list_for_each_entry(lkb, &ls->ls_timeout, lkb_time_list) {
1872
David Teiglandeeda4182008-12-09 14:12:21 -06001873 wait_us = ktime_to_us(ktime_sub(ktime_get(),
1874 lkb->lkb_timestamp));
1875
David Teigland3ae1acf2007-05-18 08:59:31 -05001876 if ((lkb->lkb_exflags & DLM_LKF_TIMEOUT) &&
David Teiglandeeda4182008-12-09 14:12:21 -06001877 wait_us >= (lkb->lkb_timeout_cs * 10000))
David Teigland3ae1acf2007-05-18 08:59:31 -05001878 do_cancel = 1;
1879
1880 if ((lkb->lkb_flags & DLM_IFL_WATCH_TIMEWARN) &&
David Teiglandeeda4182008-12-09 14:12:21 -06001881 wait_us >= dlm_config.ci_timewarn_cs * 10000)
David Teigland3ae1acf2007-05-18 08:59:31 -05001882 do_warn = 1;
1883
1884 if (!do_cancel && !do_warn)
1885 continue;
1886 hold_lkb(lkb);
1887 break;
1888 }
1889 mutex_unlock(&ls->ls_timeout_mutex);
1890
1891 if (!do_cancel && !do_warn)
1892 break;
1893
1894 r = lkb->lkb_resource;
1895 hold_rsb(r);
1896 lock_rsb(r);
1897
1898 if (do_warn) {
1899 /* clear flag so we only warn once */
1900 lkb->lkb_flags &= ~DLM_IFL_WATCH_TIMEWARN;
1901 if (!(lkb->lkb_exflags & DLM_LKF_TIMEOUT))
1902 del_timeout(lkb);
1903 dlm_timeout_warn(lkb);
1904 }
1905
1906 if (do_cancel) {
Steven Whitehouseb3cab7b2007-05-29 11:14:21 +01001907 log_debug(ls, "timeout cancel %x node %d %s",
David Teigland639aca42007-05-18 16:02:57 -05001908 lkb->lkb_id, lkb->lkb_nodeid, r->res_name);
David Teigland3ae1acf2007-05-18 08:59:31 -05001909 lkb->lkb_flags &= ~DLM_IFL_WATCH_TIMEWARN;
1910 lkb->lkb_flags |= DLM_IFL_TIMEOUT_CANCEL;
1911 del_timeout(lkb);
1912 _cancel_lock(r, lkb);
1913 }
1914
1915 unlock_rsb(r);
1916 unhold_rsb(r);
1917 dlm_put_lkb(lkb);
1918 }
1919}
1920
1921/* This is only called by dlm_recoverd, and we rely on dlm_ls_stop() stopping
1922 dlm_recoverd before checking/setting ls_recover_begin. */
1923
1924void dlm_adjust_timeouts(struct dlm_ls *ls)
1925{
1926 struct dlm_lkb *lkb;
David Teiglandeeda4182008-12-09 14:12:21 -06001927 u64 adj_us = jiffies_to_usecs(jiffies - ls->ls_recover_begin);
David Teigland3ae1acf2007-05-18 08:59:31 -05001928
1929 ls->ls_recover_begin = 0;
1930 mutex_lock(&ls->ls_timeout_mutex);
1931 list_for_each_entry(lkb, &ls->ls_timeout, lkb_time_list)
David Teiglandeeda4182008-12-09 14:12:21 -06001932 lkb->lkb_timestamp = ktime_add_us(lkb->lkb_timestamp, adj_us);
David Teigland3ae1acf2007-05-18 08:59:31 -05001933 mutex_unlock(&ls->ls_timeout_mutex);
David Teiglandc6ff6692011-03-28 14:17:26 -05001934
1935 if (!dlm_config.ci_waitwarn_us)
1936 return;
1937
1938 mutex_lock(&ls->ls_waiters_mutex);
1939 list_for_each_entry(lkb, &ls->ls_waiters, lkb_wait_reply) {
1940 if (ktime_to_us(lkb->lkb_wait_time))
1941 lkb->lkb_wait_time = ktime_get();
1942 }
1943 mutex_unlock(&ls->ls_waiters_mutex);
David Teigland3ae1acf2007-05-18 08:59:31 -05001944}
1945
David Teiglande7fd4172006-01-18 09:30:29 +00001946/* lkb is master or local copy */
1947
1948static void set_lvb_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
1949{
1950 int b, len = r->res_ls->ls_lvblen;
1951
1952 /* b=1 lvb returned to caller
1953 b=0 lvb written to rsb or invalidated
1954 b=-1 do nothing */
1955
1956 b = dlm_lvb_operations[lkb->lkb_grmode + 1][lkb->lkb_rqmode + 1];
1957
1958 if (b == 1) {
1959 if (!lkb->lkb_lvbptr)
1960 return;
1961
1962 if (!(lkb->lkb_exflags & DLM_LKF_VALBLK))
1963 return;
1964
1965 if (!r->res_lvbptr)
1966 return;
1967
1968 memcpy(lkb->lkb_lvbptr, r->res_lvbptr, len);
1969 lkb->lkb_lvbseq = r->res_lvbseq;
1970
1971 } else if (b == 0) {
1972 if (lkb->lkb_exflags & DLM_LKF_IVVALBLK) {
1973 rsb_set_flag(r, RSB_VALNOTVALID);
1974 return;
1975 }
1976
1977 if (!lkb->lkb_lvbptr)
1978 return;
1979
1980 if (!(lkb->lkb_exflags & DLM_LKF_VALBLK))
1981 return;
1982
1983 if (!r->res_lvbptr)
David Teigland52bda2b2007-11-07 09:06:49 -06001984 r->res_lvbptr = dlm_allocate_lvb(r->res_ls);
David Teiglande7fd4172006-01-18 09:30:29 +00001985
1986 if (!r->res_lvbptr)
1987 return;
1988
1989 memcpy(r->res_lvbptr, lkb->lkb_lvbptr, len);
1990 r->res_lvbseq++;
1991 lkb->lkb_lvbseq = r->res_lvbseq;
1992 rsb_clear_flag(r, RSB_VALNOTVALID);
1993 }
1994
1995 if (rsb_flag(r, RSB_VALNOTVALID))
1996 lkb->lkb_sbflags |= DLM_SBF_VALNOTVALID;
1997}
1998
1999static void set_lvb_unlock(struct dlm_rsb *r, struct dlm_lkb *lkb)
2000{
2001 if (lkb->lkb_grmode < DLM_LOCK_PW)
2002 return;
2003
2004 if (lkb->lkb_exflags & DLM_LKF_IVVALBLK) {
2005 rsb_set_flag(r, RSB_VALNOTVALID);
2006 return;
2007 }
2008
2009 if (!lkb->lkb_lvbptr)
2010 return;
2011
2012 if (!(lkb->lkb_exflags & DLM_LKF_VALBLK))
2013 return;
2014
2015 if (!r->res_lvbptr)
David Teigland52bda2b2007-11-07 09:06:49 -06002016 r->res_lvbptr = dlm_allocate_lvb(r->res_ls);
David Teiglande7fd4172006-01-18 09:30:29 +00002017
2018 if (!r->res_lvbptr)
2019 return;
2020
2021 memcpy(r->res_lvbptr, lkb->lkb_lvbptr, r->res_ls->ls_lvblen);
2022 r->res_lvbseq++;
2023 rsb_clear_flag(r, RSB_VALNOTVALID);
2024}
2025
2026/* lkb is process copy (pc) */
2027
2028static void set_lvb_lock_pc(struct dlm_rsb *r, struct dlm_lkb *lkb,
2029 struct dlm_message *ms)
2030{
2031 int b;
2032
2033 if (!lkb->lkb_lvbptr)
2034 return;
2035
2036 if (!(lkb->lkb_exflags & DLM_LKF_VALBLK))
2037 return;
2038
David Teigland597d0ca2006-07-12 16:44:04 -05002039 b = dlm_lvb_operations[lkb->lkb_grmode + 1][lkb->lkb_rqmode + 1];
David Teiglande7fd4172006-01-18 09:30:29 +00002040 if (b == 1) {
2041 int len = receive_extralen(ms);
Bart Van Asschecfa805f2013-06-26 14:27:57 +02002042 if (len > r->res_ls->ls_lvblen)
2043 len = r->res_ls->ls_lvblen;
David Teiglande7fd4172006-01-18 09:30:29 +00002044 memcpy(lkb->lkb_lvbptr, ms->m_extra, len);
2045 lkb->lkb_lvbseq = ms->m_lvbseq;
2046 }
2047}
2048
2049/* Manipulate lkb's on rsb's convert/granted/waiting queues
2050 remove_lock -- used for unlock, removes lkb from granted
2051 revert_lock -- used for cancel, moves lkb from convert to granted
2052 grant_lock -- used for request and convert, adds lkb to granted or
2053 moves lkb from convert or waiting to granted
2054
2055 Each of these is used for master or local copy lkb's. There is
2056 also a _pc() variation used to make the corresponding change on
2057 a process copy (pc) lkb. */
2058
2059static void _remove_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
2060{
2061 del_lkb(r, lkb);
2062 lkb->lkb_grmode = DLM_LOCK_IV;
2063 /* this unhold undoes the original ref from create_lkb()
2064 so this leads to the lkb being freed */
2065 unhold_lkb(lkb);
2066}
2067
2068static void remove_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
2069{
2070 set_lvb_unlock(r, lkb);
2071 _remove_lock(r, lkb);
2072}
2073
2074static void remove_lock_pc(struct dlm_rsb *r, struct dlm_lkb *lkb)
2075{
2076 _remove_lock(r, lkb);
2077}
2078
David Teiglandef0c2bb2007-03-28 09:56:46 -05002079/* returns: 0 did nothing
2080 1 moved lock to granted
2081 -1 removed lock */
2082
2083static int revert_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
David Teiglande7fd4172006-01-18 09:30:29 +00002084{
David Teiglandef0c2bb2007-03-28 09:56:46 -05002085 int rv = 0;
2086
David Teiglande7fd4172006-01-18 09:30:29 +00002087 lkb->lkb_rqmode = DLM_LOCK_IV;
2088
2089 switch (lkb->lkb_status) {
David Teigland597d0ca2006-07-12 16:44:04 -05002090 case DLM_LKSTS_GRANTED:
2091 break;
David Teiglande7fd4172006-01-18 09:30:29 +00002092 case DLM_LKSTS_CONVERT:
2093 move_lkb(r, lkb, DLM_LKSTS_GRANTED);
David Teiglandef0c2bb2007-03-28 09:56:46 -05002094 rv = 1;
David Teiglande7fd4172006-01-18 09:30:29 +00002095 break;
2096 case DLM_LKSTS_WAITING:
2097 del_lkb(r, lkb);
2098 lkb->lkb_grmode = DLM_LOCK_IV;
2099 /* this unhold undoes the original ref from create_lkb()
2100 so this leads to the lkb being freed */
2101 unhold_lkb(lkb);
David Teiglandef0c2bb2007-03-28 09:56:46 -05002102 rv = -1;
David Teiglande7fd4172006-01-18 09:30:29 +00002103 break;
2104 default:
2105 log_print("invalid status for revert %d", lkb->lkb_status);
2106 }
David Teiglandef0c2bb2007-03-28 09:56:46 -05002107 return rv;
David Teiglande7fd4172006-01-18 09:30:29 +00002108}
2109
David Teiglandef0c2bb2007-03-28 09:56:46 -05002110static int revert_lock_pc(struct dlm_rsb *r, struct dlm_lkb *lkb)
David Teiglande7fd4172006-01-18 09:30:29 +00002111{
David Teiglandef0c2bb2007-03-28 09:56:46 -05002112 return revert_lock(r, lkb);
David Teiglande7fd4172006-01-18 09:30:29 +00002113}
2114
2115static void _grant_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
2116{
2117 if (lkb->lkb_grmode != lkb->lkb_rqmode) {
2118 lkb->lkb_grmode = lkb->lkb_rqmode;
2119 if (lkb->lkb_status)
2120 move_lkb(r, lkb, DLM_LKSTS_GRANTED);
2121 else
2122 add_lkb(r, lkb, DLM_LKSTS_GRANTED);
2123 }
2124
2125 lkb->lkb_rqmode = DLM_LOCK_IV;
David Teigland48756472012-04-26 15:54:29 -05002126 lkb->lkb_highbast = 0;
David Teiglande7fd4172006-01-18 09:30:29 +00002127}
2128
2129static void grant_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
2130{
2131 set_lvb_lock(r, lkb);
2132 _grant_lock(r, lkb);
David Teiglande7fd4172006-01-18 09:30:29 +00002133}
2134
2135static void grant_lock_pc(struct dlm_rsb *r, struct dlm_lkb *lkb,
2136 struct dlm_message *ms)
2137{
2138 set_lvb_lock_pc(r, lkb, ms);
2139 _grant_lock(r, lkb);
2140}
2141
2142/* called by grant_pending_locks() which means an async grant message must
2143 be sent to the requesting node in addition to granting the lock if the
2144 lkb belongs to a remote node. */
2145
2146static void grant_lock_pending(struct dlm_rsb *r, struct dlm_lkb *lkb)
2147{
2148 grant_lock(r, lkb);
2149 if (is_master_copy(lkb))
2150 send_grant(r, lkb);
2151 else
2152 queue_cast(r, lkb, 0);
2153}
2154
David Teigland7d3c1fe2007-04-19 10:30:41 -05002155/* The special CONVDEADLK, ALTPR and ALTCW flags allow the master to
2156 change the granted/requested modes. We're munging things accordingly in
2157 the process copy.
2158 CONVDEADLK: our grmode may have been forced down to NL to resolve a
2159 conversion deadlock
2160 ALTPR/ALTCW: our rqmode may have been changed to PR or CW to become
2161 compatible with other granted locks */
2162
David Teigland2a7ce0e2011-04-04 15:19:59 -05002163static void munge_demoted(struct dlm_lkb *lkb)
David Teigland7d3c1fe2007-04-19 10:30:41 -05002164{
David Teigland7d3c1fe2007-04-19 10:30:41 -05002165 if (lkb->lkb_rqmode == DLM_LOCK_IV || lkb->lkb_grmode == DLM_LOCK_IV) {
2166 log_print("munge_demoted %x invalid modes gr %d rq %d",
2167 lkb->lkb_id, lkb->lkb_grmode, lkb->lkb_rqmode);
2168 return;
2169 }
2170
2171 lkb->lkb_grmode = DLM_LOCK_NL;
2172}
2173
2174static void munge_altmode(struct dlm_lkb *lkb, struct dlm_message *ms)
2175{
2176 if (ms->m_type != DLM_MSG_REQUEST_REPLY &&
2177 ms->m_type != DLM_MSG_GRANT) {
2178 log_print("munge_altmode %x invalid reply type %d",
2179 lkb->lkb_id, ms->m_type);
2180 return;
2181 }
2182
2183 if (lkb->lkb_exflags & DLM_LKF_ALTPR)
2184 lkb->lkb_rqmode = DLM_LOCK_PR;
2185 else if (lkb->lkb_exflags & DLM_LKF_ALTCW)
2186 lkb->lkb_rqmode = DLM_LOCK_CW;
2187 else {
2188 log_print("munge_altmode invalid exflags %x", lkb->lkb_exflags);
2189 dlm_print_lkb(lkb);
2190 }
2191}
2192
David Teiglande7fd4172006-01-18 09:30:29 +00002193static inline int first_in_list(struct dlm_lkb *lkb, struct list_head *head)
2194{
2195 struct dlm_lkb *first = list_entry(head->next, struct dlm_lkb,
2196 lkb_statequeue);
2197 if (lkb->lkb_id == first->lkb_id)
David Teigland90135922006-01-20 08:47:07 +00002198 return 1;
David Teiglande7fd4172006-01-18 09:30:29 +00002199
David Teigland90135922006-01-20 08:47:07 +00002200 return 0;
David Teiglande7fd4172006-01-18 09:30:29 +00002201}
2202
David Teiglande7fd4172006-01-18 09:30:29 +00002203/* Check if the given lkb conflicts with another lkb on the queue. */
2204
2205static int queue_conflict(struct list_head *head, struct dlm_lkb *lkb)
2206{
2207 struct dlm_lkb *this;
2208
2209 list_for_each_entry(this, head, lkb_statequeue) {
2210 if (this == lkb)
2211 continue;
David Teigland3bcd3682006-02-23 09:56:38 +00002212 if (!modes_compat(this, lkb))
David Teigland90135922006-01-20 08:47:07 +00002213 return 1;
David Teiglande7fd4172006-01-18 09:30:29 +00002214 }
David Teigland90135922006-01-20 08:47:07 +00002215 return 0;
David Teiglande7fd4172006-01-18 09:30:29 +00002216}
2217
2218/*
2219 * "A conversion deadlock arises with a pair of lock requests in the converting
2220 * queue for one resource. The granted mode of each lock blocks the requested
2221 * mode of the other lock."
2222 *
David Teiglandc85d65e2007-05-18 09:01:26 -05002223 * Part 2: if the granted mode of lkb is preventing an earlier lkb in the
2224 * convert queue from being granted, then deadlk/demote lkb.
David Teiglande7fd4172006-01-18 09:30:29 +00002225 *
2226 * Example:
2227 * Granted Queue: empty
2228 * Convert Queue: NL->EX (first lock)
2229 * PR->EX (second lock)
2230 *
2231 * The first lock can't be granted because of the granted mode of the second
2232 * lock and the second lock can't be granted because it's not first in the
David Teiglandc85d65e2007-05-18 09:01:26 -05002233 * list. We either cancel lkb's conversion (PR->EX) and return EDEADLK, or we
2234 * demote the granted mode of lkb (from PR to NL) if it has the CONVDEADLK
2235 * flag set and return DEMOTED in the lksb flags.
David Teiglande7fd4172006-01-18 09:30:29 +00002236 *
David Teiglandc85d65e2007-05-18 09:01:26 -05002237 * Originally, this function detected conv-deadlk in a more limited scope:
2238 * - if !modes_compat(lkb1, lkb2) && !modes_compat(lkb2, lkb1), or
2239 * - if lkb1 was the first entry in the queue (not just earlier), and was
2240 * blocked by the granted mode of lkb2, and there was nothing on the
2241 * granted queue preventing lkb1 from being granted immediately, i.e.
2242 * lkb2 was the only thing preventing lkb1 from being granted.
2243 *
2244 * That second condition meant we'd only say there was conv-deadlk if
2245 * resolving it (by demotion) would lead to the first lock on the convert
2246 * queue being granted right away. It allowed conversion deadlocks to exist
2247 * between locks on the convert queue while they couldn't be granted anyway.
2248 *
2249 * Now, we detect and take action on conversion deadlocks immediately when
2250 * they're created, even if they may not be immediately consequential. If
2251 * lkb1 exists anywhere in the convert queue and lkb2 comes in with a granted
2252 * mode that would prevent lkb1's conversion from being granted, we do a
2253 * deadlk/demote on lkb2 right away and don't let it onto the convert queue.
2254 * I think this means that the lkb_is_ahead condition below should always
2255 * be zero, i.e. there will never be conv-deadlk between two locks that are
2256 * both already on the convert queue.
David Teiglande7fd4172006-01-18 09:30:29 +00002257 */
2258
David Teiglandc85d65e2007-05-18 09:01:26 -05002259static int conversion_deadlock_detect(struct dlm_rsb *r, struct dlm_lkb *lkb2)
David Teiglande7fd4172006-01-18 09:30:29 +00002260{
David Teiglandc85d65e2007-05-18 09:01:26 -05002261 struct dlm_lkb *lkb1;
2262 int lkb_is_ahead = 0;
David Teiglande7fd4172006-01-18 09:30:29 +00002263
David Teiglandc85d65e2007-05-18 09:01:26 -05002264 list_for_each_entry(lkb1, &r->res_convertqueue, lkb_statequeue) {
2265 if (lkb1 == lkb2) {
2266 lkb_is_ahead = 1;
David Teiglande7fd4172006-01-18 09:30:29 +00002267 continue;
2268 }
2269
David Teiglandc85d65e2007-05-18 09:01:26 -05002270 if (!lkb_is_ahead) {
2271 if (!modes_compat(lkb2, lkb1))
2272 return 1;
2273 } else {
2274 if (!modes_compat(lkb2, lkb1) &&
2275 !modes_compat(lkb1, lkb2))
2276 return 1;
2277 }
David Teiglande7fd4172006-01-18 09:30:29 +00002278 }
David Teigland90135922006-01-20 08:47:07 +00002279 return 0;
David Teiglande7fd4172006-01-18 09:30:29 +00002280}
2281
2282/*
2283 * Return 1 if the lock can be granted, 0 otherwise.
2284 * Also detect and resolve conversion deadlocks.
2285 *
2286 * lkb is the lock to be granted
2287 *
2288 * now is 1 if the function is being called in the context of the
2289 * immediate request, it is 0 if called later, after the lock has been
2290 * queued.
2291 *
David Teiglandc503a622012-06-05 15:55:19 -05002292 * recover is 1 if dlm_recover_grant() is trying to grant conversions
2293 * after recovery.
2294 *
David Teiglande7fd4172006-01-18 09:30:29 +00002295 * References are from chapter 6 of "VAXcluster Principles" by Roy Davis
2296 */
2297
David Teiglandc503a622012-06-05 15:55:19 -05002298static int _can_be_granted(struct dlm_rsb *r, struct dlm_lkb *lkb, int now,
2299 int recover)
David Teiglande7fd4172006-01-18 09:30:29 +00002300{
2301 int8_t conv = (lkb->lkb_grmode != DLM_LOCK_IV);
2302
2303 /*
2304 * 6-10: Version 5.4 introduced an option to address the phenomenon of
2305 * a new request for a NL mode lock being blocked.
2306 *
2307 * 6-11: If the optional EXPEDITE flag is used with the new NL mode
2308 * request, then it would be granted. In essence, the use of this flag
2309 * tells the Lock Manager to expedite theis request by not considering
2310 * what may be in the CONVERTING or WAITING queues... As of this
2311 * writing, the EXPEDITE flag can be used only with new requests for NL
2312 * mode locks. This flag is not valid for conversion requests.
2313 *
2314 * A shortcut. Earlier checks return an error if EXPEDITE is used in a
2315 * conversion or used with a non-NL requested mode. We also know an
2316 * EXPEDITE request is always granted immediately, so now must always
2317 * be 1. The full condition to grant an expedite request: (now &&
2318 * !conv && lkb->rqmode == DLM_LOCK_NL && (flags & EXPEDITE)) can
2319 * therefore be shortened to just checking the flag.
2320 */
2321
2322 if (lkb->lkb_exflags & DLM_LKF_EXPEDITE)
David Teigland90135922006-01-20 08:47:07 +00002323 return 1;
David Teiglande7fd4172006-01-18 09:30:29 +00002324
2325 /*
2326 * A shortcut. Without this, !queue_conflict(grantqueue, lkb) would be
2327 * added to the remaining conditions.
2328 */
2329
2330 if (queue_conflict(&r->res_grantqueue, lkb))
David Teiglandc503a622012-06-05 15:55:19 -05002331 return 0;
David Teiglande7fd4172006-01-18 09:30:29 +00002332
2333 /*
2334 * 6-3: By default, a conversion request is immediately granted if the
2335 * requested mode is compatible with the modes of all other granted
2336 * locks
2337 */
2338
2339 if (queue_conflict(&r->res_convertqueue, lkb))
David Teiglandc503a622012-06-05 15:55:19 -05002340 return 0;
2341
2342 /*
2343 * The RECOVER_GRANT flag means dlm_recover_grant() is granting
2344 * locks for a recovered rsb, on which lkb's have been rebuilt.
2345 * The lkb's may have been rebuilt on the queues in a different
2346 * order than they were in on the previous master. So, granting
2347 * queued conversions in order after recovery doesn't make sense
2348 * since the order hasn't been preserved anyway. The new order
2349 * could also have created a new "in place" conversion deadlock.
2350 * (e.g. old, failed master held granted EX, with PR->EX, NL->EX.
2351 * After recovery, there would be no granted locks, and possibly
2352 * NL->EX, PR->EX, an in-place conversion deadlock.) So, after
2353 * recovery, grant conversions without considering order.
2354 */
2355
2356 if (conv && recover)
2357 return 1;
David Teiglande7fd4172006-01-18 09:30:29 +00002358
2359 /*
2360 * 6-5: But the default algorithm for deciding whether to grant or
2361 * queue conversion requests does not by itself guarantee that such
2362 * requests are serviced on a "first come first serve" basis. This, in
2363 * turn, can lead to a phenomenon known as "indefinate postponement".
2364 *
2365 * 6-7: This issue is dealt with by using the optional QUECVT flag with
2366 * the system service employed to request a lock conversion. This flag
2367 * forces certain conversion requests to be queued, even if they are
2368 * compatible with the granted modes of other locks on the same
2369 * resource. Thus, the use of this flag results in conversion requests
2370 * being ordered on a "first come first servce" basis.
2371 *
2372 * DCT: This condition is all about new conversions being able to occur
2373 * "in place" while the lock remains on the granted queue (assuming
2374 * nothing else conflicts.) IOW if QUECVT isn't set, a conversion
2375 * doesn't _have_ to go onto the convert queue where it's processed in
2376 * order. The "now" variable is necessary to distinguish converts
2377 * being received and processed for the first time now, because once a
2378 * convert is moved to the conversion queue the condition below applies
2379 * requiring fifo granting.
2380 */
2381
2382 if (now && conv && !(lkb->lkb_exflags & DLM_LKF_QUECVT))
David Teigland90135922006-01-20 08:47:07 +00002383 return 1;
David Teiglande7fd4172006-01-18 09:30:29 +00002384
2385 /*
David Teigland53ad1c92012-04-04 09:49:15 -05002386 * Even if the convert is compat with all granted locks,
2387 * QUECVT forces it behind other locks on the convert queue.
2388 */
2389
2390 if (now && conv && (lkb->lkb_exflags & DLM_LKF_QUECVT)) {
2391 if (list_empty(&r->res_convertqueue))
2392 return 1;
2393 else
David Teiglandc503a622012-06-05 15:55:19 -05002394 return 0;
David Teigland53ad1c92012-04-04 09:49:15 -05002395 }
2396
2397 /*
David Teigland3bcd3682006-02-23 09:56:38 +00002398 * The NOORDER flag is set to avoid the standard vms rules on grant
2399 * order.
David Teiglande7fd4172006-01-18 09:30:29 +00002400 */
2401
2402 if (lkb->lkb_exflags & DLM_LKF_NOORDER)
David Teigland90135922006-01-20 08:47:07 +00002403 return 1;
David Teiglande7fd4172006-01-18 09:30:29 +00002404
2405 /*
2406 * 6-3: Once in that queue [CONVERTING], a conversion request cannot be
2407 * granted until all other conversion requests ahead of it are granted
2408 * and/or canceled.
2409 */
2410
2411 if (!now && conv && first_in_list(lkb, &r->res_convertqueue))
David Teigland90135922006-01-20 08:47:07 +00002412 return 1;
David Teiglande7fd4172006-01-18 09:30:29 +00002413
2414 /*
2415 * 6-4: By default, a new request is immediately granted only if all
2416 * three of the following conditions are satisfied when the request is
2417 * issued:
2418 * - The queue of ungranted conversion requests for the resource is
2419 * empty.
2420 * - The queue of ungranted new requests for the resource is empty.
2421 * - The mode of the new request is compatible with the most
2422 * restrictive mode of all granted locks on the resource.
2423 */
2424
2425 if (now && !conv && list_empty(&r->res_convertqueue) &&
2426 list_empty(&r->res_waitqueue))
David Teigland90135922006-01-20 08:47:07 +00002427 return 1;
David Teiglande7fd4172006-01-18 09:30:29 +00002428
2429 /*
2430 * 6-4: Once a lock request is in the queue of ungranted new requests,
2431 * it cannot be granted until the queue of ungranted conversion
2432 * requests is empty, all ungranted new requests ahead of it are
2433 * granted and/or canceled, and it is compatible with the granted mode
2434 * of the most restrictive lock granted on the resource.
2435 */
2436
2437 if (!now && !conv && list_empty(&r->res_convertqueue) &&
2438 first_in_list(lkb, &r->res_waitqueue))
David Teigland90135922006-01-20 08:47:07 +00002439 return 1;
David Teiglandc503a622012-06-05 15:55:19 -05002440
David Teigland90135922006-01-20 08:47:07 +00002441 return 0;
David Teiglande7fd4172006-01-18 09:30:29 +00002442}
2443
David Teiglandc85d65e2007-05-18 09:01:26 -05002444static int can_be_granted(struct dlm_rsb *r, struct dlm_lkb *lkb, int now,
David Teiglandc503a622012-06-05 15:55:19 -05002445 int recover, int *err)
David Teiglande7fd4172006-01-18 09:30:29 +00002446{
David Teiglande7fd4172006-01-18 09:30:29 +00002447 int rv;
2448 int8_t alt = 0, rqmode = lkb->lkb_rqmode;
David Teiglandc85d65e2007-05-18 09:01:26 -05002449 int8_t is_convert = (lkb->lkb_grmode != DLM_LOCK_IV);
2450
2451 if (err)
2452 *err = 0;
David Teiglande7fd4172006-01-18 09:30:29 +00002453
David Teiglandc503a622012-06-05 15:55:19 -05002454 rv = _can_be_granted(r, lkb, now, recover);
David Teiglande7fd4172006-01-18 09:30:29 +00002455 if (rv)
2456 goto out;
2457
David Teiglandc85d65e2007-05-18 09:01:26 -05002458 /*
2459 * The CONVDEADLK flag is non-standard and tells the dlm to resolve
2460 * conversion deadlocks by demoting grmode to NL, otherwise the dlm
2461 * cancels one of the locks.
2462 */
David Teiglande7fd4172006-01-18 09:30:29 +00002463
David Teiglandc85d65e2007-05-18 09:01:26 -05002464 if (is_convert && can_be_queued(lkb) &&
2465 conversion_deadlock_detect(r, lkb)) {
2466 if (lkb->lkb_exflags & DLM_LKF_CONVDEADLK) {
2467 lkb->lkb_grmode = DLM_LOCK_NL;
2468 lkb->lkb_sbflags |= DLM_SBF_DEMOTED;
2469 } else if (!(lkb->lkb_exflags & DLM_LKF_NODLCKWT)) {
2470 if (err)
2471 *err = -EDEADLK;
2472 else {
2473 log_print("can_be_granted deadlock %x now %d",
2474 lkb->lkb_id, now);
2475 dlm_dump_rsb(r);
2476 }
2477 }
2478 goto out;
2479 }
2480
2481 /*
2482 * The ALTPR and ALTCW flags are non-standard and tell the dlm to try
2483 * to grant a request in a mode other than the normal rqmode. It's a
2484 * simple way to provide a big optimization to applications that can
2485 * use them.
2486 */
2487
2488 if (rqmode != DLM_LOCK_PR && (lkb->lkb_exflags & DLM_LKF_ALTPR))
David Teiglande7fd4172006-01-18 09:30:29 +00002489 alt = DLM_LOCK_PR;
David Teiglandc85d65e2007-05-18 09:01:26 -05002490 else if (rqmode != DLM_LOCK_CW && (lkb->lkb_exflags & DLM_LKF_ALTCW))
David Teiglande7fd4172006-01-18 09:30:29 +00002491 alt = DLM_LOCK_CW;
2492
2493 if (alt) {
2494 lkb->lkb_rqmode = alt;
David Teiglandc503a622012-06-05 15:55:19 -05002495 rv = _can_be_granted(r, lkb, now, 0);
David Teiglande7fd4172006-01-18 09:30:29 +00002496 if (rv)
2497 lkb->lkb_sbflags |= DLM_SBF_ALTMODE;
2498 else
2499 lkb->lkb_rqmode = rqmode;
2500 }
2501 out:
2502 return rv;
2503}
2504
David Teiglandc85d65e2007-05-18 09:01:26 -05002505/* FIXME: I don't think that can_be_granted() can/will demote or find deadlock
2506 for locks pending on the convert list. Once verified (watch for these
2507 log_prints), we should be able to just call _can_be_granted() and not
2508 bother with the demote/deadlk cases here (and there's no easy way to deal
2509 with a deadlk here, we'd have to generate something like grant_lock with
2510 the deadlk error.) */
2511
David Teigland36509252007-08-07 09:44:48 -05002512/* Returns the highest requested mode of all blocked conversions; sets
2513 cw if there's a blocked conversion to DLM_LOCK_CW. */
David Teiglandc85d65e2007-05-18 09:01:26 -05002514
David Teigland48756472012-04-26 15:54:29 -05002515static int grant_pending_convert(struct dlm_rsb *r, int high, int *cw,
2516 unsigned int *count)
David Teiglande7fd4172006-01-18 09:30:29 +00002517{
2518 struct dlm_lkb *lkb, *s;
David Teiglandc503a622012-06-05 15:55:19 -05002519 int recover = rsb_flag(r, RSB_RECOVER_GRANT);
David Teiglande7fd4172006-01-18 09:30:29 +00002520 int hi, demoted, quit, grant_restart, demote_restart;
David Teiglandc85d65e2007-05-18 09:01:26 -05002521 int deadlk;
David Teiglande7fd4172006-01-18 09:30:29 +00002522
2523 quit = 0;
2524 restart:
2525 grant_restart = 0;
2526 demote_restart = 0;
2527 hi = DLM_LOCK_IV;
2528
2529 list_for_each_entry_safe(lkb, s, &r->res_convertqueue, lkb_statequeue) {
2530 demoted = is_demoted(lkb);
David Teiglandc85d65e2007-05-18 09:01:26 -05002531 deadlk = 0;
2532
David Teiglandc503a622012-06-05 15:55:19 -05002533 if (can_be_granted(r, lkb, 0, recover, &deadlk)) {
David Teiglande7fd4172006-01-18 09:30:29 +00002534 grant_lock_pending(r, lkb);
2535 grant_restart = 1;
David Teigland48756472012-04-26 15:54:29 -05002536 if (count)
2537 (*count)++;
David Teiglandc85d65e2007-05-18 09:01:26 -05002538 continue;
David Teiglande7fd4172006-01-18 09:30:29 +00002539 }
David Teiglandc85d65e2007-05-18 09:01:26 -05002540
2541 if (!demoted && is_demoted(lkb)) {
2542 log_print("WARN: pending demoted %x node %d %s",
2543 lkb->lkb_id, lkb->lkb_nodeid, r->res_name);
2544 demote_restart = 1;
2545 continue;
2546 }
2547
2548 if (deadlk) {
2549 log_print("WARN: pending deadlock %x node %d %s",
2550 lkb->lkb_id, lkb->lkb_nodeid, r->res_name);
2551 dlm_dump_rsb(r);
2552 continue;
2553 }
2554
2555 hi = max_t(int, lkb->lkb_rqmode, hi);
David Teigland36509252007-08-07 09:44:48 -05002556
2557 if (cw && lkb->lkb_rqmode == DLM_LOCK_CW)
2558 *cw = 1;
David Teiglande7fd4172006-01-18 09:30:29 +00002559 }
2560
2561 if (grant_restart)
2562 goto restart;
2563 if (demote_restart && !quit) {
2564 quit = 1;
2565 goto restart;
2566 }
2567
2568 return max_t(int, high, hi);
2569}
2570
David Teigland48756472012-04-26 15:54:29 -05002571static int grant_pending_wait(struct dlm_rsb *r, int high, int *cw,
2572 unsigned int *count)
David Teiglande7fd4172006-01-18 09:30:29 +00002573{
2574 struct dlm_lkb *lkb, *s;
2575
2576 list_for_each_entry_safe(lkb, s, &r->res_waitqueue, lkb_statequeue) {
David Teiglandc503a622012-06-05 15:55:19 -05002577 if (can_be_granted(r, lkb, 0, 0, NULL)) {
David Teiglande7fd4172006-01-18 09:30:29 +00002578 grant_lock_pending(r, lkb);
David Teigland48756472012-04-26 15:54:29 -05002579 if (count)
2580 (*count)++;
2581 } else {
David Teiglande7fd4172006-01-18 09:30:29 +00002582 high = max_t(int, lkb->lkb_rqmode, high);
David Teigland36509252007-08-07 09:44:48 -05002583 if (lkb->lkb_rqmode == DLM_LOCK_CW)
2584 *cw = 1;
2585 }
David Teiglande7fd4172006-01-18 09:30:29 +00002586 }
2587
2588 return high;
2589}
2590
David Teigland36509252007-08-07 09:44:48 -05002591/* cw of 1 means there's a lock with a rqmode of DLM_LOCK_CW that's blocked
2592 on either the convert or waiting queue.
2593 high is the largest rqmode of all locks blocked on the convert or
2594 waiting queue. */
2595
2596static int lock_requires_bast(struct dlm_lkb *gr, int high, int cw)
2597{
2598 if (gr->lkb_grmode == DLM_LOCK_PR && cw) {
2599 if (gr->lkb_highbast < DLM_LOCK_EX)
2600 return 1;
2601 return 0;
2602 }
2603
2604 if (gr->lkb_highbast < high &&
2605 !__dlm_compat_matrix[gr->lkb_grmode+1][high+1])
2606 return 1;
2607 return 0;
2608}
2609
David Teigland48756472012-04-26 15:54:29 -05002610static void grant_pending_locks(struct dlm_rsb *r, unsigned int *count)
David Teiglande7fd4172006-01-18 09:30:29 +00002611{
2612 struct dlm_lkb *lkb, *s;
2613 int high = DLM_LOCK_IV;
David Teigland36509252007-08-07 09:44:48 -05002614 int cw = 0;
David Teiglande7fd4172006-01-18 09:30:29 +00002615
David Teigland48756472012-04-26 15:54:29 -05002616 if (!is_master(r)) {
2617 log_print("grant_pending_locks r nodeid %d", r->res_nodeid);
2618 dlm_dump_rsb(r);
2619 return;
2620 }
David Teiglande7fd4172006-01-18 09:30:29 +00002621
David Teigland48756472012-04-26 15:54:29 -05002622 high = grant_pending_convert(r, high, &cw, count);
2623 high = grant_pending_wait(r, high, &cw, count);
David Teiglande7fd4172006-01-18 09:30:29 +00002624
2625 if (high == DLM_LOCK_IV)
2626 return;
2627
2628 /*
2629 * If there are locks left on the wait/convert queue then send blocking
2630 * ASTs to granted locks based on the largest requested mode (high)
David Teigland36509252007-08-07 09:44:48 -05002631 * found above.
David Teiglande7fd4172006-01-18 09:30:29 +00002632 */
2633
2634 list_for_each_entry_safe(lkb, s, &r->res_grantqueue, lkb_statequeue) {
David Teiglande5dae542008-02-06 00:35:45 -06002635 if (lkb->lkb_bastfn && lock_requires_bast(lkb, high, cw)) {
David Teigland329fc4c2008-05-20 12:18:10 -05002636 if (cw && high == DLM_LOCK_PR &&
2637 lkb->lkb_grmode == DLM_LOCK_PR)
David Teigland36509252007-08-07 09:44:48 -05002638 queue_bast(r, lkb, DLM_LOCK_CW);
2639 else
2640 queue_bast(r, lkb, high);
David Teiglande7fd4172006-01-18 09:30:29 +00002641 lkb->lkb_highbast = high;
2642 }
2643 }
2644}
2645
David Teigland36509252007-08-07 09:44:48 -05002646static int modes_require_bast(struct dlm_lkb *gr, struct dlm_lkb *rq)
2647{
2648 if ((gr->lkb_grmode == DLM_LOCK_PR && rq->lkb_rqmode == DLM_LOCK_CW) ||
2649 (gr->lkb_grmode == DLM_LOCK_CW && rq->lkb_rqmode == DLM_LOCK_PR)) {
2650 if (gr->lkb_highbast < DLM_LOCK_EX)
2651 return 1;
2652 return 0;
2653 }
2654
2655 if (gr->lkb_highbast < rq->lkb_rqmode && !modes_compat(gr, rq))
2656 return 1;
2657 return 0;
2658}
2659
David Teiglande7fd4172006-01-18 09:30:29 +00002660static void send_bast_queue(struct dlm_rsb *r, struct list_head *head,
2661 struct dlm_lkb *lkb)
2662{
2663 struct dlm_lkb *gr;
2664
2665 list_for_each_entry(gr, head, lkb_statequeue) {
Steven Whitehouse314dd2a2010-09-03 10:07:48 -05002666 /* skip self when sending basts to convertqueue */
2667 if (gr == lkb)
2668 continue;
David Teiglande5dae542008-02-06 00:35:45 -06002669 if (gr->lkb_bastfn && modes_require_bast(gr, lkb)) {
David Teiglande7fd4172006-01-18 09:30:29 +00002670 queue_bast(r, gr, lkb->lkb_rqmode);
2671 gr->lkb_highbast = lkb->lkb_rqmode;
2672 }
2673 }
2674}
2675
2676static void send_blocking_asts(struct dlm_rsb *r, struct dlm_lkb *lkb)
2677{
2678 send_bast_queue(r, &r->res_grantqueue, lkb);
2679}
2680
2681static void send_blocking_asts_all(struct dlm_rsb *r, struct dlm_lkb *lkb)
2682{
2683 send_bast_queue(r, &r->res_grantqueue, lkb);
2684 send_bast_queue(r, &r->res_convertqueue, lkb);
2685}
2686
2687/* set_master(r, lkb) -- set the master nodeid of a resource
2688
2689 The purpose of this function is to set the nodeid field in the given
2690 lkb using the nodeid field in the given rsb. If the rsb's nodeid is
2691 known, it can just be copied to the lkb and the function will return
2692 0. If the rsb's nodeid is _not_ known, it needs to be looked up
2693 before it can be copied to the lkb.
2694
2695 When the rsb nodeid is being looked up remotely, the initial lkb
2696 causing the lookup is kept on the ls_waiters list waiting for the
2697 lookup reply. Other lkb's waiting for the same rsb lookup are kept
2698 on the rsb's res_lookup list until the master is verified.
2699
2700 Return values:
2701 0: nodeid is set in rsb/lkb and the caller should go ahead and use it
2702 1: the rsb master is not available and the lkb has been placed on
2703 a wait queue
2704*/
2705
2706static int set_master(struct dlm_rsb *r, struct dlm_lkb *lkb)
2707{
David Teiglandc04fecb2012-05-10 10:18:07 -05002708 int our_nodeid = dlm_our_nodeid();
David Teiglande7fd4172006-01-18 09:30:29 +00002709
2710 if (rsb_flag(r, RSB_MASTER_UNCERTAIN)) {
2711 rsb_clear_flag(r, RSB_MASTER_UNCERTAIN);
2712 r->res_first_lkid = lkb->lkb_id;
2713 lkb->lkb_nodeid = r->res_nodeid;
2714 return 0;
2715 }
2716
2717 if (r->res_first_lkid && r->res_first_lkid != lkb->lkb_id) {
2718 list_add_tail(&lkb->lkb_rsb_lookup, &r->res_lookup);
2719 return 1;
2720 }
2721
David Teiglandc04fecb2012-05-10 10:18:07 -05002722 if (r->res_master_nodeid == our_nodeid) {
David Teiglande7fd4172006-01-18 09:30:29 +00002723 lkb->lkb_nodeid = 0;
2724 return 0;
2725 }
2726
David Teiglandc04fecb2012-05-10 10:18:07 -05002727 if (r->res_master_nodeid) {
2728 lkb->lkb_nodeid = r->res_master_nodeid;
David Teiglande7fd4172006-01-18 09:30:29 +00002729 return 0;
2730 }
2731
David Teiglandc04fecb2012-05-10 10:18:07 -05002732 if (dlm_dir_nodeid(r) == our_nodeid) {
2733 /* This is a somewhat unusual case; find_rsb will usually
2734 have set res_master_nodeid when dir nodeid is local, but
2735 there are cases where we become the dir node after we've
2736 past find_rsb and go through _request_lock again.
2737 confirm_master() or process_lookup_list() needs to be
2738 called after this. */
2739 log_debug(r->res_ls, "set_master %x self master %d dir %d %s",
2740 lkb->lkb_id, r->res_master_nodeid, r->res_dir_nodeid,
2741 r->res_name);
2742 r->res_master_nodeid = our_nodeid;
David Teiglande7fd4172006-01-18 09:30:29 +00002743 r->res_nodeid = 0;
2744 lkb->lkb_nodeid = 0;
David Teiglandc04fecb2012-05-10 10:18:07 -05002745 return 0;
David Teiglande7fd4172006-01-18 09:30:29 +00002746 }
David Teiglandc04fecb2012-05-10 10:18:07 -05002747
David Teigland05c32f42012-06-14 12:17:32 -05002748 wait_pending_remove(r);
2749
David Teiglandc04fecb2012-05-10 10:18:07 -05002750 r->res_first_lkid = lkb->lkb_id;
2751 send_lookup(r, lkb);
2752 return 1;
David Teiglande7fd4172006-01-18 09:30:29 +00002753}
2754
2755static void process_lookup_list(struct dlm_rsb *r)
2756{
2757 struct dlm_lkb *lkb, *safe;
2758
2759 list_for_each_entry_safe(lkb, safe, &r->res_lookup, lkb_rsb_lookup) {
David Teiglandef0c2bb2007-03-28 09:56:46 -05002760 list_del_init(&lkb->lkb_rsb_lookup);
David Teiglande7fd4172006-01-18 09:30:29 +00002761 _request_lock(r, lkb);
2762 schedule();
2763 }
2764}
2765
2766/* confirm_master -- confirm (or deny) an rsb's master nodeid */
2767
2768static void confirm_master(struct dlm_rsb *r, int error)
2769{
2770 struct dlm_lkb *lkb;
2771
2772 if (!r->res_first_lkid)
2773 return;
2774
2775 switch (error) {
2776 case 0:
2777 case -EINPROGRESS:
2778 r->res_first_lkid = 0;
2779 process_lookup_list(r);
2780 break;
2781
2782 case -EAGAIN:
David Teiglandaec64e12008-01-08 15:37:47 -06002783 case -EBADR:
2784 case -ENOTBLK:
2785 /* the remote request failed and won't be retried (it was
2786 a NOQUEUE, or has been canceled/unlocked); make a waiting
2787 lkb the first_lkid */
David Teiglande7fd4172006-01-18 09:30:29 +00002788
2789 r->res_first_lkid = 0;
2790
2791 if (!list_empty(&r->res_lookup)) {
2792 lkb = list_entry(r->res_lookup.next, struct dlm_lkb,
2793 lkb_rsb_lookup);
David Teiglandef0c2bb2007-03-28 09:56:46 -05002794 list_del_init(&lkb->lkb_rsb_lookup);
David Teiglande7fd4172006-01-18 09:30:29 +00002795 r->res_first_lkid = lkb->lkb_id;
2796 _request_lock(r, lkb);
David Teigland761b9d32008-02-21 11:25:42 -06002797 }
David Teiglande7fd4172006-01-18 09:30:29 +00002798 break;
2799
2800 default:
2801 log_error(r->res_ls, "confirm_master unknown error %d", error);
2802 }
2803}
2804
2805static int set_lock_args(int mode, struct dlm_lksb *lksb, uint32_t flags,
David Teiglande5dae542008-02-06 00:35:45 -06002806 int namelen, unsigned long timeout_cs,
2807 void (*ast) (void *astparam),
2808 void *astparam,
2809 void (*bast) (void *astparam, int mode),
2810 struct dlm_args *args)
David Teiglande7fd4172006-01-18 09:30:29 +00002811{
2812 int rv = -EINVAL;
2813
2814 /* check for invalid arg usage */
2815
2816 if (mode < 0 || mode > DLM_LOCK_EX)
2817 goto out;
2818
2819 if (!(flags & DLM_LKF_CONVERT) && (namelen > DLM_RESNAME_MAXLEN))
2820 goto out;
2821
2822 if (flags & DLM_LKF_CANCEL)
2823 goto out;
2824
2825 if (flags & DLM_LKF_QUECVT && !(flags & DLM_LKF_CONVERT))
2826 goto out;
2827
2828 if (flags & DLM_LKF_CONVDEADLK && !(flags & DLM_LKF_CONVERT))
2829 goto out;
2830
2831 if (flags & DLM_LKF_CONVDEADLK && flags & DLM_LKF_NOQUEUE)
2832 goto out;
2833
2834 if (flags & DLM_LKF_EXPEDITE && flags & DLM_LKF_CONVERT)
2835 goto out;
2836
2837 if (flags & DLM_LKF_EXPEDITE && flags & DLM_LKF_QUECVT)
2838 goto out;
2839
2840 if (flags & DLM_LKF_EXPEDITE && flags & DLM_LKF_NOQUEUE)
2841 goto out;
2842
2843 if (flags & DLM_LKF_EXPEDITE && mode != DLM_LOCK_NL)
2844 goto out;
2845
2846 if (!ast || !lksb)
2847 goto out;
2848
2849 if (flags & DLM_LKF_VALBLK && !lksb->sb_lvbptr)
2850 goto out;
2851
David Teiglande7fd4172006-01-18 09:30:29 +00002852 if (flags & DLM_LKF_CONVERT && !lksb->sb_lkid)
2853 goto out;
2854
2855 /* these args will be copied to the lkb in validate_lock_args,
2856 it cannot be done now because when converting locks, fields in
2857 an active lkb cannot be modified before locking the rsb */
2858
2859 args->flags = flags;
David Teiglande5dae542008-02-06 00:35:45 -06002860 args->astfn = ast;
2861 args->astparam = astparam;
2862 args->bastfn = bast;
David Teiglandd7db9232007-05-18 09:00:32 -05002863 args->timeout = timeout_cs;
David Teiglande7fd4172006-01-18 09:30:29 +00002864 args->mode = mode;
2865 args->lksb = lksb;
David Teiglande7fd4172006-01-18 09:30:29 +00002866 rv = 0;
2867 out:
2868 return rv;
2869}
2870
2871static int set_unlock_args(uint32_t flags, void *astarg, struct dlm_args *args)
2872{
2873 if (flags & ~(DLM_LKF_CANCEL | DLM_LKF_VALBLK | DLM_LKF_IVVALBLK |
2874 DLM_LKF_FORCEUNLOCK))
2875 return -EINVAL;
2876
David Teiglandef0c2bb2007-03-28 09:56:46 -05002877 if (flags & DLM_LKF_CANCEL && flags & DLM_LKF_FORCEUNLOCK)
2878 return -EINVAL;
2879
David Teiglande7fd4172006-01-18 09:30:29 +00002880 args->flags = flags;
David Teiglande5dae542008-02-06 00:35:45 -06002881 args->astparam = astarg;
David Teiglande7fd4172006-01-18 09:30:29 +00002882 return 0;
2883}
2884
2885static int validate_lock_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
2886 struct dlm_args *args)
2887{
2888 int rv = -EINVAL;
2889
2890 if (args->flags & DLM_LKF_CONVERT) {
2891 if (lkb->lkb_flags & DLM_IFL_MSTCPY)
2892 goto out;
2893
2894 if (args->flags & DLM_LKF_QUECVT &&
2895 !__quecvt_compat_matrix[lkb->lkb_grmode+1][args->mode+1])
2896 goto out;
2897
2898 rv = -EBUSY;
2899 if (lkb->lkb_status != DLM_LKSTS_GRANTED)
2900 goto out;
2901
2902 if (lkb->lkb_wait_type)
2903 goto out;
David Teiglandef0c2bb2007-03-28 09:56:46 -05002904
2905 if (is_overlap(lkb))
2906 goto out;
David Teiglande7fd4172006-01-18 09:30:29 +00002907 }
2908
2909 lkb->lkb_exflags = args->flags;
2910 lkb->lkb_sbflags = 0;
David Teiglande5dae542008-02-06 00:35:45 -06002911 lkb->lkb_astfn = args->astfn;
David Teiglande7fd4172006-01-18 09:30:29 +00002912 lkb->lkb_astparam = args->astparam;
David Teiglande5dae542008-02-06 00:35:45 -06002913 lkb->lkb_bastfn = args->bastfn;
David Teiglande7fd4172006-01-18 09:30:29 +00002914 lkb->lkb_rqmode = args->mode;
2915 lkb->lkb_lksb = args->lksb;
2916 lkb->lkb_lvbptr = args->lksb->sb_lvbptr;
2917 lkb->lkb_ownpid = (int) current->pid;
David Teiglandd7db9232007-05-18 09:00:32 -05002918 lkb->lkb_timeout_cs = args->timeout;
David Teiglande7fd4172006-01-18 09:30:29 +00002919 rv = 0;
2920 out:
David Teigland43279e52009-01-28 14:37:54 -06002921 if (rv)
2922 log_debug(ls, "validate_lock_args %d %x %x %x %d %d %s",
2923 rv, lkb->lkb_id, lkb->lkb_flags, args->flags,
2924 lkb->lkb_status, lkb->lkb_wait_type,
2925 lkb->lkb_resource->res_name);
David Teiglande7fd4172006-01-18 09:30:29 +00002926 return rv;
2927}
2928
David Teiglandef0c2bb2007-03-28 09:56:46 -05002929/* when dlm_unlock() sees -EBUSY with CANCEL/FORCEUNLOCK it returns 0
2930 for success */
2931
2932/* note: it's valid for lkb_nodeid/res_nodeid to be -1 when we get here
2933 because there may be a lookup in progress and it's valid to do
2934 cancel/unlockf on it */
2935
David Teiglande7fd4172006-01-18 09:30:29 +00002936static int validate_unlock_args(struct dlm_lkb *lkb, struct dlm_args *args)
2937{
David Teiglandef0c2bb2007-03-28 09:56:46 -05002938 struct dlm_ls *ls = lkb->lkb_resource->res_ls;
David Teiglande7fd4172006-01-18 09:30:29 +00002939 int rv = -EINVAL;
2940
David Teiglandef0c2bb2007-03-28 09:56:46 -05002941 if (lkb->lkb_flags & DLM_IFL_MSTCPY) {
2942 log_error(ls, "unlock on MSTCPY %x", lkb->lkb_id);
2943 dlm_print_lkb(lkb);
David Teiglande7fd4172006-01-18 09:30:29 +00002944 goto out;
David Teiglandef0c2bb2007-03-28 09:56:46 -05002945 }
David Teiglande7fd4172006-01-18 09:30:29 +00002946
David Teiglandef0c2bb2007-03-28 09:56:46 -05002947 /* an lkb may still exist even though the lock is EOL'ed due to a
2948 cancel, unlock or failed noqueue request; an app can't use these
2949 locks; return same error as if the lkid had not been found at all */
2950
2951 if (lkb->lkb_flags & DLM_IFL_ENDOFLIFE) {
2952 log_debug(ls, "unlock on ENDOFLIFE %x", lkb->lkb_id);
2953 rv = -ENOENT;
2954 goto out;
2955 }
2956
2957 /* an lkb may be waiting for an rsb lookup to complete where the
2958 lookup was initiated by another lock */
2959
David Teigland42dc1602008-01-09 10:30:45 -06002960 if (!list_empty(&lkb->lkb_rsb_lookup)) {
2961 if (args->flags & (DLM_LKF_CANCEL | DLM_LKF_FORCEUNLOCK)) {
David Teiglandef0c2bb2007-03-28 09:56:46 -05002962 log_debug(ls, "unlock on rsb_lookup %x", lkb->lkb_id);
2963 list_del_init(&lkb->lkb_rsb_lookup);
2964 queue_cast(lkb->lkb_resource, lkb,
2965 args->flags & DLM_LKF_CANCEL ?
2966 -DLM_ECANCEL : -DLM_EUNLOCK);
2967 unhold_lkb(lkb); /* undoes create_lkb() */
David Teiglandef0c2bb2007-03-28 09:56:46 -05002968 }
David Teigland42dc1602008-01-09 10:30:45 -06002969 /* caller changes -EBUSY to 0 for CANCEL and FORCEUNLOCK */
2970 rv = -EBUSY;
2971 goto out;
David Teiglandef0c2bb2007-03-28 09:56:46 -05002972 }
2973
2974 /* cancel not allowed with another cancel/unlock in progress */
2975
2976 if (args->flags & DLM_LKF_CANCEL) {
2977 if (lkb->lkb_exflags & DLM_LKF_CANCEL)
2978 goto out;
2979
2980 if (is_overlap(lkb))
2981 goto out;
2982
David Teigland3ae1acf2007-05-18 08:59:31 -05002983 /* don't let scand try to do a cancel */
2984 del_timeout(lkb);
2985
David Teiglandef0c2bb2007-03-28 09:56:46 -05002986 if (lkb->lkb_flags & DLM_IFL_RESEND) {
2987 lkb->lkb_flags |= DLM_IFL_OVERLAP_CANCEL;
2988 rv = -EBUSY;
2989 goto out;
2990 }
2991
David Teiglanda536e382009-02-27 15:23:28 -06002992 /* there's nothing to cancel */
2993 if (lkb->lkb_status == DLM_LKSTS_GRANTED &&
2994 !lkb->lkb_wait_type) {
2995 rv = -EBUSY;
2996 goto out;
2997 }
2998
David Teiglandef0c2bb2007-03-28 09:56:46 -05002999 switch (lkb->lkb_wait_type) {
3000 case DLM_MSG_LOOKUP:
3001 case DLM_MSG_REQUEST:
3002 lkb->lkb_flags |= DLM_IFL_OVERLAP_CANCEL;
3003 rv = -EBUSY;
3004 goto out;
3005 case DLM_MSG_UNLOCK:
3006 case DLM_MSG_CANCEL:
3007 goto out;
3008 }
3009 /* add_to_waiters() will set OVERLAP_CANCEL */
David Teiglande7fd4172006-01-18 09:30:29 +00003010 goto out_ok;
David Teiglandef0c2bb2007-03-28 09:56:46 -05003011 }
David Teiglande7fd4172006-01-18 09:30:29 +00003012
David Teiglandef0c2bb2007-03-28 09:56:46 -05003013 /* do we need to allow a force-unlock if there's a normal unlock
3014 already in progress? in what conditions could the normal unlock
3015 fail such that we'd want to send a force-unlock to be sure? */
David Teiglande7fd4172006-01-18 09:30:29 +00003016
David Teiglandef0c2bb2007-03-28 09:56:46 -05003017 if (args->flags & DLM_LKF_FORCEUNLOCK) {
3018 if (lkb->lkb_exflags & DLM_LKF_FORCEUNLOCK)
3019 goto out;
David Teiglande7fd4172006-01-18 09:30:29 +00003020
David Teiglandef0c2bb2007-03-28 09:56:46 -05003021 if (is_overlap_unlock(lkb))
3022 goto out;
3023
David Teigland3ae1acf2007-05-18 08:59:31 -05003024 /* don't let scand try to do a cancel */
3025 del_timeout(lkb);
3026
David Teiglandef0c2bb2007-03-28 09:56:46 -05003027 if (lkb->lkb_flags & DLM_IFL_RESEND) {
3028 lkb->lkb_flags |= DLM_IFL_OVERLAP_UNLOCK;
3029 rv = -EBUSY;
3030 goto out;
3031 }
3032
3033 switch (lkb->lkb_wait_type) {
3034 case DLM_MSG_LOOKUP:
3035 case DLM_MSG_REQUEST:
3036 lkb->lkb_flags |= DLM_IFL_OVERLAP_UNLOCK;
3037 rv = -EBUSY;
3038 goto out;
3039 case DLM_MSG_UNLOCK:
3040 goto out;
3041 }
3042 /* add_to_waiters() will set OVERLAP_UNLOCK */
3043 goto out_ok;
3044 }
3045
3046 /* normal unlock not allowed if there's any op in progress */
David Teiglande7fd4172006-01-18 09:30:29 +00003047 rv = -EBUSY;
David Teiglandef0c2bb2007-03-28 09:56:46 -05003048 if (lkb->lkb_wait_type || lkb->lkb_wait_count)
David Teiglande7fd4172006-01-18 09:30:29 +00003049 goto out;
3050
3051 out_ok:
David Teiglandef0c2bb2007-03-28 09:56:46 -05003052 /* an overlapping op shouldn't blow away exflags from other op */
3053 lkb->lkb_exflags |= args->flags;
David Teiglande7fd4172006-01-18 09:30:29 +00003054 lkb->lkb_sbflags = 0;
3055 lkb->lkb_astparam = args->astparam;
David Teiglande7fd4172006-01-18 09:30:29 +00003056 rv = 0;
3057 out:
David Teiglandef0c2bb2007-03-28 09:56:46 -05003058 if (rv)
3059 log_debug(ls, "validate_unlock_args %d %x %x %x %x %d %s", rv,
3060 lkb->lkb_id, lkb->lkb_flags, lkb->lkb_exflags,
3061 args->flags, lkb->lkb_wait_type,
3062 lkb->lkb_resource->res_name);
David Teiglande7fd4172006-01-18 09:30:29 +00003063 return rv;
3064}
3065
3066/*
3067 * Four stage 4 varieties:
3068 * do_request(), do_convert(), do_unlock(), do_cancel()
3069 * These are called on the master node for the given lock and
3070 * from the central locking logic.
3071 */
3072
3073static int do_request(struct dlm_rsb *r, struct dlm_lkb *lkb)
3074{
3075 int error = 0;
3076
David Teiglandc503a622012-06-05 15:55:19 -05003077 if (can_be_granted(r, lkb, 1, 0, NULL)) {
David Teiglande7fd4172006-01-18 09:30:29 +00003078 grant_lock(r, lkb);
3079 queue_cast(r, lkb, 0);
3080 goto out;
3081 }
3082
3083 if (can_be_queued(lkb)) {
3084 error = -EINPROGRESS;
3085 add_lkb(r, lkb, DLM_LKSTS_WAITING);
David Teigland3ae1acf2007-05-18 08:59:31 -05003086 add_timeout(lkb);
David Teiglande7fd4172006-01-18 09:30:29 +00003087 goto out;
3088 }
3089
3090 error = -EAGAIN;
David Teiglande7fd4172006-01-18 09:30:29 +00003091 queue_cast(r, lkb, -EAGAIN);
David Teiglande7fd4172006-01-18 09:30:29 +00003092 out:
3093 return error;
3094}
3095
David Teiglandcf6620a2010-02-24 11:59:23 -06003096static void do_request_effects(struct dlm_rsb *r, struct dlm_lkb *lkb,
3097 int error)
3098{
3099 switch (error) {
3100 case -EAGAIN:
3101 if (force_blocking_asts(lkb))
3102 send_blocking_asts_all(r, lkb);
3103 break;
3104 case -EINPROGRESS:
3105 send_blocking_asts(r, lkb);
3106 break;
3107 }
3108}
3109
David Teiglande7fd4172006-01-18 09:30:29 +00003110static int do_convert(struct dlm_rsb *r, struct dlm_lkb *lkb)
3111{
3112 int error = 0;
David Teiglandc85d65e2007-05-18 09:01:26 -05003113 int deadlk = 0;
David Teiglande7fd4172006-01-18 09:30:29 +00003114
3115 /* changing an existing lock may allow others to be granted */
3116
David Teiglandc503a622012-06-05 15:55:19 -05003117 if (can_be_granted(r, lkb, 1, 0, &deadlk)) {
David Teiglande7fd4172006-01-18 09:30:29 +00003118 grant_lock(r, lkb);
3119 queue_cast(r, lkb, 0);
David Teiglande7fd4172006-01-18 09:30:29 +00003120 goto out;
3121 }
3122
David Teiglandc85d65e2007-05-18 09:01:26 -05003123 /* can_be_granted() detected that this lock would block in a conversion
3124 deadlock, so we leave it on the granted queue and return EDEADLK in
3125 the ast for the convert. */
3126
3127 if (deadlk) {
3128 /* it's left on the granted queue */
David Teiglandc85d65e2007-05-18 09:01:26 -05003129 revert_lock(r, lkb);
3130 queue_cast(r, lkb, -EDEADLK);
3131 error = -EDEADLK;
3132 goto out;
3133 }
3134
David Teigland7d3c1fe2007-04-19 10:30:41 -05003135 /* is_demoted() means the can_be_granted() above set the grmode
3136 to NL, and left us on the granted queue. This auto-demotion
3137 (due to CONVDEADLK) might mean other locks, and/or this lock, are
3138 now grantable. We have to try to grant other converting locks
3139 before we try again to grant this one. */
3140
3141 if (is_demoted(lkb)) {
David Teigland48756472012-04-26 15:54:29 -05003142 grant_pending_convert(r, DLM_LOCK_IV, NULL, NULL);
David Teiglandc503a622012-06-05 15:55:19 -05003143 if (_can_be_granted(r, lkb, 1, 0)) {
David Teigland7d3c1fe2007-04-19 10:30:41 -05003144 grant_lock(r, lkb);
3145 queue_cast(r, lkb, 0);
David Teigland7d3c1fe2007-04-19 10:30:41 -05003146 goto out;
3147 }
3148 /* else fall through and move to convert queue */
3149 }
3150
3151 if (can_be_queued(lkb)) {
David Teiglande7fd4172006-01-18 09:30:29 +00003152 error = -EINPROGRESS;
3153 del_lkb(r, lkb);
3154 add_lkb(r, lkb, DLM_LKSTS_CONVERT);
David Teigland3ae1acf2007-05-18 08:59:31 -05003155 add_timeout(lkb);
David Teiglande7fd4172006-01-18 09:30:29 +00003156 goto out;
3157 }
3158
3159 error = -EAGAIN;
David Teiglande7fd4172006-01-18 09:30:29 +00003160 queue_cast(r, lkb, -EAGAIN);
David Teiglande7fd4172006-01-18 09:30:29 +00003161 out:
3162 return error;
3163}
3164
David Teiglandcf6620a2010-02-24 11:59:23 -06003165static void do_convert_effects(struct dlm_rsb *r, struct dlm_lkb *lkb,
3166 int error)
3167{
3168 switch (error) {
3169 case 0:
David Teigland48756472012-04-26 15:54:29 -05003170 grant_pending_locks(r, NULL);
David Teiglandcf6620a2010-02-24 11:59:23 -06003171 /* grant_pending_locks also sends basts */
3172 break;
3173 case -EAGAIN:
3174 if (force_blocking_asts(lkb))
3175 send_blocking_asts_all(r, lkb);
3176 break;
3177 case -EINPROGRESS:
3178 send_blocking_asts(r, lkb);
3179 break;
3180 }
3181}
3182
David Teiglande7fd4172006-01-18 09:30:29 +00003183static int do_unlock(struct dlm_rsb *r, struct dlm_lkb *lkb)
3184{
3185 remove_lock(r, lkb);
3186 queue_cast(r, lkb, -DLM_EUNLOCK);
David Teiglande7fd4172006-01-18 09:30:29 +00003187 return -DLM_EUNLOCK;
3188}
3189
David Teiglandcf6620a2010-02-24 11:59:23 -06003190static void do_unlock_effects(struct dlm_rsb *r, struct dlm_lkb *lkb,
3191 int error)
3192{
David Teigland48756472012-04-26 15:54:29 -05003193 grant_pending_locks(r, NULL);
David Teiglandcf6620a2010-02-24 11:59:23 -06003194}
3195
David Teiglandef0c2bb2007-03-28 09:56:46 -05003196/* returns: 0 did nothing, -DLM_ECANCEL canceled lock */
David Teiglandc04fecb2012-05-10 10:18:07 -05003197
David Teiglande7fd4172006-01-18 09:30:29 +00003198static int do_cancel(struct dlm_rsb *r, struct dlm_lkb *lkb)
3199{
David Teiglandef0c2bb2007-03-28 09:56:46 -05003200 int error;
3201
3202 error = revert_lock(r, lkb);
3203 if (error) {
3204 queue_cast(r, lkb, -DLM_ECANCEL);
David Teiglandef0c2bb2007-03-28 09:56:46 -05003205 return -DLM_ECANCEL;
3206 }
3207 return 0;
David Teiglande7fd4172006-01-18 09:30:29 +00003208}
3209
David Teiglandcf6620a2010-02-24 11:59:23 -06003210static void do_cancel_effects(struct dlm_rsb *r, struct dlm_lkb *lkb,
3211 int error)
3212{
3213 if (error)
David Teigland48756472012-04-26 15:54:29 -05003214 grant_pending_locks(r, NULL);
David Teiglandcf6620a2010-02-24 11:59:23 -06003215}
3216
David Teiglande7fd4172006-01-18 09:30:29 +00003217/*
3218 * Four stage 3 varieties:
3219 * _request_lock(), _convert_lock(), _unlock_lock(), _cancel_lock()
3220 */
3221
3222/* add a new lkb to a possibly new rsb, called by requesting process */
3223
3224static int _request_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
3225{
3226 int error;
3227
3228 /* set_master: sets lkb nodeid from r */
3229
3230 error = set_master(r, lkb);
3231 if (error < 0)
3232 goto out;
3233 if (error) {
3234 error = 0;
3235 goto out;
3236 }
3237
David Teiglandcf6620a2010-02-24 11:59:23 -06003238 if (is_remote(r)) {
David Teiglande7fd4172006-01-18 09:30:29 +00003239 /* receive_request() calls do_request() on remote node */
3240 error = send_request(r, lkb);
David Teiglandcf6620a2010-02-24 11:59:23 -06003241 } else {
David Teiglande7fd4172006-01-18 09:30:29 +00003242 error = do_request(r, lkb);
David Teiglandcf6620a2010-02-24 11:59:23 -06003243 /* for remote locks the request_reply is sent
3244 between do_request and do_request_effects */
3245 do_request_effects(r, lkb, error);
3246 }
David Teiglande7fd4172006-01-18 09:30:29 +00003247 out:
3248 return error;
3249}
3250
David Teigland3bcd3682006-02-23 09:56:38 +00003251/* change some property of an existing lkb, e.g. mode */
David Teiglande7fd4172006-01-18 09:30:29 +00003252
3253static int _convert_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
3254{
3255 int error;
3256
David Teiglandcf6620a2010-02-24 11:59:23 -06003257 if (is_remote(r)) {
David Teiglande7fd4172006-01-18 09:30:29 +00003258 /* receive_convert() calls do_convert() on remote node */
3259 error = send_convert(r, lkb);
David Teiglandcf6620a2010-02-24 11:59:23 -06003260 } else {
David Teiglande7fd4172006-01-18 09:30:29 +00003261 error = do_convert(r, lkb);
David Teiglandcf6620a2010-02-24 11:59:23 -06003262 /* for remote locks the convert_reply is sent
3263 between do_convert and do_convert_effects */
3264 do_convert_effects(r, lkb, error);
3265 }
David Teiglande7fd4172006-01-18 09:30:29 +00003266
3267 return error;
3268}
3269
3270/* remove an existing lkb from the granted queue */
3271
3272static int _unlock_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
3273{
3274 int error;
3275
David Teiglandcf6620a2010-02-24 11:59:23 -06003276 if (is_remote(r)) {
David Teiglande7fd4172006-01-18 09:30:29 +00003277 /* receive_unlock() calls do_unlock() on remote node */
3278 error = send_unlock(r, lkb);
David Teiglandcf6620a2010-02-24 11:59:23 -06003279 } else {
David Teiglande7fd4172006-01-18 09:30:29 +00003280 error = do_unlock(r, lkb);
David Teiglandcf6620a2010-02-24 11:59:23 -06003281 /* for remote locks the unlock_reply is sent
3282 between do_unlock and do_unlock_effects */
3283 do_unlock_effects(r, lkb, error);
3284 }
David Teiglande7fd4172006-01-18 09:30:29 +00003285
3286 return error;
3287}
3288
3289/* remove an existing lkb from the convert or wait queue */
3290
3291static int _cancel_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
3292{
3293 int error;
3294
David Teiglandcf6620a2010-02-24 11:59:23 -06003295 if (is_remote(r)) {
David Teiglande7fd4172006-01-18 09:30:29 +00003296 /* receive_cancel() calls do_cancel() on remote node */
3297 error = send_cancel(r, lkb);
David Teiglandcf6620a2010-02-24 11:59:23 -06003298 } else {
David Teiglande7fd4172006-01-18 09:30:29 +00003299 error = do_cancel(r, lkb);
David Teiglandcf6620a2010-02-24 11:59:23 -06003300 /* for remote locks the cancel_reply is sent
3301 between do_cancel and do_cancel_effects */
3302 do_cancel_effects(r, lkb, error);
3303 }
David Teiglande7fd4172006-01-18 09:30:29 +00003304
3305 return error;
3306}
3307
3308/*
3309 * Four stage 2 varieties:
3310 * request_lock(), convert_lock(), unlock_lock(), cancel_lock()
3311 */
3312
3313static int request_lock(struct dlm_ls *ls, struct dlm_lkb *lkb, char *name,
3314 int len, struct dlm_args *args)
3315{
3316 struct dlm_rsb *r;
3317 int error;
3318
3319 error = validate_lock_args(ls, lkb, args);
3320 if (error)
David Teiglandc04fecb2012-05-10 10:18:07 -05003321 return error;
David Teiglande7fd4172006-01-18 09:30:29 +00003322
David Teiglandc04fecb2012-05-10 10:18:07 -05003323 error = find_rsb(ls, name, len, 0, R_REQUEST, &r);
David Teiglande7fd4172006-01-18 09:30:29 +00003324 if (error)
David Teiglandc04fecb2012-05-10 10:18:07 -05003325 return error;
David Teiglande7fd4172006-01-18 09:30:29 +00003326
3327 lock_rsb(r);
3328
3329 attach_lkb(r, lkb);
3330 lkb->lkb_lksb->sb_lkid = lkb->lkb_id;
3331
3332 error = _request_lock(r, lkb);
3333
3334 unlock_rsb(r);
3335 put_rsb(r);
David Teiglande7fd4172006-01-18 09:30:29 +00003336 return error;
3337}
3338
3339static int convert_lock(struct dlm_ls *ls, struct dlm_lkb *lkb,
3340 struct dlm_args *args)
3341{
3342 struct dlm_rsb *r;
3343 int error;
3344
3345 r = lkb->lkb_resource;
3346
3347 hold_rsb(r);
3348 lock_rsb(r);
3349
3350 error = validate_lock_args(ls, lkb, args);
3351 if (error)
3352 goto out;
3353
3354 error = _convert_lock(r, lkb);
3355 out:
3356 unlock_rsb(r);
3357 put_rsb(r);
3358 return error;
3359}
3360
3361static int unlock_lock(struct dlm_ls *ls, struct dlm_lkb *lkb,
3362 struct dlm_args *args)
3363{
3364 struct dlm_rsb *r;
3365 int error;
3366
3367 r = lkb->lkb_resource;
3368
3369 hold_rsb(r);
3370 lock_rsb(r);
3371
3372 error = validate_unlock_args(lkb, args);
3373 if (error)
3374 goto out;
3375
3376 error = _unlock_lock(r, lkb);
3377 out:
3378 unlock_rsb(r);
3379 put_rsb(r);
3380 return error;
3381}
3382
3383static int cancel_lock(struct dlm_ls *ls, struct dlm_lkb *lkb,
3384 struct dlm_args *args)
3385{
3386 struct dlm_rsb *r;
3387 int error;
3388
3389 r = lkb->lkb_resource;
3390
3391 hold_rsb(r);
3392 lock_rsb(r);
3393
3394 error = validate_unlock_args(lkb, args);
3395 if (error)
3396 goto out;
3397
3398 error = _cancel_lock(r, lkb);
3399 out:
3400 unlock_rsb(r);
3401 put_rsb(r);
3402 return error;
3403}
3404
3405/*
3406 * Two stage 1 varieties: dlm_lock() and dlm_unlock()
3407 */
3408
3409int dlm_lock(dlm_lockspace_t *lockspace,
3410 int mode,
3411 struct dlm_lksb *lksb,
3412 uint32_t flags,
3413 void *name,
3414 unsigned int namelen,
3415 uint32_t parent_lkid,
3416 void (*ast) (void *astarg),
3417 void *astarg,
David Teigland3bcd3682006-02-23 09:56:38 +00003418 void (*bast) (void *astarg, int mode))
David Teiglande7fd4172006-01-18 09:30:29 +00003419{
3420 struct dlm_ls *ls;
3421 struct dlm_lkb *lkb;
3422 struct dlm_args args;
3423 int error, convert = flags & DLM_LKF_CONVERT;
3424
3425 ls = dlm_find_lockspace_local(lockspace);
3426 if (!ls)
3427 return -EINVAL;
3428
David Teigland85e86ed2007-05-18 08:58:15 -05003429 dlm_lock_recovery(ls);
David Teiglande7fd4172006-01-18 09:30:29 +00003430
3431 if (convert)
3432 error = find_lkb(ls, lksb->sb_lkid, &lkb);
3433 else
3434 error = create_lkb(ls, &lkb);
3435
3436 if (error)
3437 goto out;
3438
David Teiglandd7db9232007-05-18 09:00:32 -05003439 error = set_lock_args(mode, lksb, flags, namelen, 0, ast,
David Teigland3bcd3682006-02-23 09:56:38 +00003440 astarg, bast, &args);
David Teiglande7fd4172006-01-18 09:30:29 +00003441 if (error)
3442 goto out_put;
3443
3444 if (convert)
3445 error = convert_lock(ls, lkb, &args);
3446 else
3447 error = request_lock(ls, lkb, name, namelen, &args);
3448
3449 if (error == -EINPROGRESS)
3450 error = 0;
3451 out_put:
3452 if (convert || error)
David Teiglandb3f58d82006-02-28 11:16:37 -05003453 __put_lkb(ls, lkb);
David Teiglandc85d65e2007-05-18 09:01:26 -05003454 if (error == -EAGAIN || error == -EDEADLK)
David Teiglande7fd4172006-01-18 09:30:29 +00003455 error = 0;
3456 out:
David Teigland85e86ed2007-05-18 08:58:15 -05003457 dlm_unlock_recovery(ls);
David Teiglande7fd4172006-01-18 09:30:29 +00003458 dlm_put_lockspace(ls);
3459 return error;
3460}
3461
3462int dlm_unlock(dlm_lockspace_t *lockspace,
3463 uint32_t lkid,
3464 uint32_t flags,
3465 struct dlm_lksb *lksb,
3466 void *astarg)
3467{
3468 struct dlm_ls *ls;
3469 struct dlm_lkb *lkb;
3470 struct dlm_args args;
3471 int error;
3472
3473 ls = dlm_find_lockspace_local(lockspace);
3474 if (!ls)
3475 return -EINVAL;
3476
David Teigland85e86ed2007-05-18 08:58:15 -05003477 dlm_lock_recovery(ls);
David Teiglande7fd4172006-01-18 09:30:29 +00003478
3479 error = find_lkb(ls, lkid, &lkb);
3480 if (error)
3481 goto out;
3482
3483 error = set_unlock_args(flags, astarg, &args);
3484 if (error)
3485 goto out_put;
3486
3487 if (flags & DLM_LKF_CANCEL)
3488 error = cancel_lock(ls, lkb, &args);
3489 else
3490 error = unlock_lock(ls, lkb, &args);
3491
3492 if (error == -DLM_EUNLOCK || error == -DLM_ECANCEL)
3493 error = 0;
David Teiglandef0c2bb2007-03-28 09:56:46 -05003494 if (error == -EBUSY && (flags & (DLM_LKF_CANCEL | DLM_LKF_FORCEUNLOCK)))
3495 error = 0;
David Teiglande7fd4172006-01-18 09:30:29 +00003496 out_put:
David Teiglandb3f58d82006-02-28 11:16:37 -05003497 dlm_put_lkb(lkb);
David Teiglande7fd4172006-01-18 09:30:29 +00003498 out:
David Teigland85e86ed2007-05-18 08:58:15 -05003499 dlm_unlock_recovery(ls);
David Teiglande7fd4172006-01-18 09:30:29 +00003500 dlm_put_lockspace(ls);
3501 return error;
3502}
3503
3504/*
3505 * send/receive routines for remote operations and replies
3506 *
3507 * send_args
3508 * send_common
3509 * send_request receive_request
3510 * send_convert receive_convert
3511 * send_unlock receive_unlock
3512 * send_cancel receive_cancel
3513 * send_grant receive_grant
3514 * send_bast receive_bast
3515 * send_lookup receive_lookup
3516 * send_remove receive_remove
3517 *
3518 * send_common_reply
3519 * receive_request_reply send_request_reply
3520 * receive_convert_reply send_convert_reply
3521 * receive_unlock_reply send_unlock_reply
3522 * receive_cancel_reply send_cancel_reply
3523 * receive_lookup_reply send_lookup_reply
3524 */
3525
David Teigland7e4dac32007-04-02 09:06:41 -05003526static int _create_message(struct dlm_ls *ls, int mb_len,
3527 int to_nodeid, int mstype,
3528 struct dlm_message **ms_ret,
3529 struct dlm_mhandle **mh_ret)
3530{
3531 struct dlm_message *ms;
3532 struct dlm_mhandle *mh;
3533 char *mb;
3534
3535 /* get_buffer gives us a message handle (mh) that we need to
3536 pass into lowcomms_commit and a message buffer (mb) that we
3537 write our data into */
3538
David Teigland573c24c2009-11-30 16:34:43 -06003539 mh = dlm_lowcomms_get_buffer(to_nodeid, mb_len, GFP_NOFS, &mb);
David Teigland7e4dac32007-04-02 09:06:41 -05003540 if (!mh)
3541 return -ENOBUFS;
3542
3543 memset(mb, 0, mb_len);
3544
3545 ms = (struct dlm_message *) mb;
3546
3547 ms->m_header.h_version = (DLM_HEADER_MAJOR | DLM_HEADER_MINOR);
3548 ms->m_header.h_lockspace = ls->ls_global_id;
3549 ms->m_header.h_nodeid = dlm_our_nodeid();
3550 ms->m_header.h_length = mb_len;
3551 ms->m_header.h_cmd = DLM_MSG;
3552
3553 ms->m_type = mstype;
3554
3555 *mh_ret = mh;
3556 *ms_ret = ms;
3557 return 0;
3558}
3559
David Teiglande7fd4172006-01-18 09:30:29 +00003560static int create_message(struct dlm_rsb *r, struct dlm_lkb *lkb,
3561 int to_nodeid, int mstype,
3562 struct dlm_message **ms_ret,
3563 struct dlm_mhandle **mh_ret)
3564{
David Teiglande7fd4172006-01-18 09:30:29 +00003565 int mb_len = sizeof(struct dlm_message);
3566
3567 switch (mstype) {
3568 case DLM_MSG_REQUEST:
3569 case DLM_MSG_LOOKUP:
3570 case DLM_MSG_REMOVE:
3571 mb_len += r->res_length;
3572 break;
3573 case DLM_MSG_CONVERT:
3574 case DLM_MSG_UNLOCK:
3575 case DLM_MSG_REQUEST_REPLY:
3576 case DLM_MSG_CONVERT_REPLY:
3577 case DLM_MSG_GRANT:
3578 if (lkb && lkb->lkb_lvbptr)
3579 mb_len += r->res_ls->ls_lvblen;
3580 break;
3581 }
3582
David Teigland7e4dac32007-04-02 09:06:41 -05003583 return _create_message(r->res_ls, mb_len, to_nodeid, mstype,
3584 ms_ret, mh_ret);
David Teiglande7fd4172006-01-18 09:30:29 +00003585}
3586
3587/* further lowcomms enhancements or alternate implementations may make
3588 the return value from this function useful at some point */
3589
3590static int send_message(struct dlm_mhandle *mh, struct dlm_message *ms)
3591{
3592 dlm_message_out(ms);
3593 dlm_lowcomms_commit_buffer(mh);
3594 return 0;
3595}
3596
3597static void send_args(struct dlm_rsb *r, struct dlm_lkb *lkb,
3598 struct dlm_message *ms)
3599{
3600 ms->m_nodeid = lkb->lkb_nodeid;
3601 ms->m_pid = lkb->lkb_ownpid;
3602 ms->m_lkid = lkb->lkb_id;
3603 ms->m_remid = lkb->lkb_remid;
3604 ms->m_exflags = lkb->lkb_exflags;
3605 ms->m_sbflags = lkb->lkb_sbflags;
3606 ms->m_flags = lkb->lkb_flags;
3607 ms->m_lvbseq = lkb->lkb_lvbseq;
3608 ms->m_status = lkb->lkb_status;
3609 ms->m_grmode = lkb->lkb_grmode;
3610 ms->m_rqmode = lkb->lkb_rqmode;
3611 ms->m_hash = r->res_hash;
3612
3613 /* m_result and m_bastmode are set from function args,
3614 not from lkb fields */
3615
David Teiglande5dae542008-02-06 00:35:45 -06003616 if (lkb->lkb_bastfn)
David Teigland8304d6f2011-02-21 14:58:21 -06003617 ms->m_asts |= DLM_CB_BAST;
David Teiglande5dae542008-02-06 00:35:45 -06003618 if (lkb->lkb_astfn)
David Teigland8304d6f2011-02-21 14:58:21 -06003619 ms->m_asts |= DLM_CB_CAST;
David Teiglande7fd4172006-01-18 09:30:29 +00003620
David Teiglandda49f362006-12-13 10:38:45 -06003621 /* compare with switch in create_message; send_remove() doesn't
3622 use send_args() */
3623
3624 switch (ms->m_type) {
3625 case DLM_MSG_REQUEST:
3626 case DLM_MSG_LOOKUP:
David Teiglande7fd4172006-01-18 09:30:29 +00003627 memcpy(ms->m_extra, r->res_name, r->res_length);
David Teiglandda49f362006-12-13 10:38:45 -06003628 break;
3629 case DLM_MSG_CONVERT:
3630 case DLM_MSG_UNLOCK:
3631 case DLM_MSG_REQUEST_REPLY:
3632 case DLM_MSG_CONVERT_REPLY:
3633 case DLM_MSG_GRANT:
3634 if (!lkb->lkb_lvbptr)
3635 break;
David Teiglande7fd4172006-01-18 09:30:29 +00003636 memcpy(ms->m_extra, lkb->lkb_lvbptr, r->res_ls->ls_lvblen);
David Teiglandda49f362006-12-13 10:38:45 -06003637 break;
3638 }
David Teiglande7fd4172006-01-18 09:30:29 +00003639}
3640
3641static int send_common(struct dlm_rsb *r, struct dlm_lkb *lkb, int mstype)
3642{
3643 struct dlm_message *ms;
3644 struct dlm_mhandle *mh;
3645 int to_nodeid, error;
3646
David Teiglandc6ff6692011-03-28 14:17:26 -05003647 to_nodeid = r->res_nodeid;
3648
3649 error = add_to_waiters(lkb, mstype, to_nodeid);
David Teiglandef0c2bb2007-03-28 09:56:46 -05003650 if (error)
3651 return error;
David Teiglande7fd4172006-01-18 09:30:29 +00003652
David Teiglande7fd4172006-01-18 09:30:29 +00003653 error = create_message(r, lkb, to_nodeid, mstype, &ms, &mh);
3654 if (error)
3655 goto fail;
3656
3657 send_args(r, lkb, ms);
3658
3659 error = send_message(mh, ms);
3660 if (error)
3661 goto fail;
3662 return 0;
3663
3664 fail:
David Teiglandef0c2bb2007-03-28 09:56:46 -05003665 remove_from_waiters(lkb, msg_reply_type(mstype));
David Teiglande7fd4172006-01-18 09:30:29 +00003666 return error;
3667}
3668
3669static int send_request(struct dlm_rsb *r, struct dlm_lkb *lkb)
3670{
3671 return send_common(r, lkb, DLM_MSG_REQUEST);
3672}
3673
3674static int send_convert(struct dlm_rsb *r, struct dlm_lkb *lkb)
3675{
3676 int error;
3677
3678 error = send_common(r, lkb, DLM_MSG_CONVERT);
3679
3680 /* down conversions go without a reply from the master */
3681 if (!error && down_conversion(lkb)) {
David Teiglandef0c2bb2007-03-28 09:56:46 -05003682 remove_from_waiters(lkb, DLM_MSG_CONVERT_REPLY);
David Teigland2a7ce0e2011-04-04 15:19:59 -05003683 r->res_ls->ls_stub_ms.m_flags = DLM_IFL_STUB_MS;
David Teiglandef0c2bb2007-03-28 09:56:46 -05003684 r->res_ls->ls_stub_ms.m_type = DLM_MSG_CONVERT_REPLY;
David Teiglande7fd4172006-01-18 09:30:29 +00003685 r->res_ls->ls_stub_ms.m_result = 0;
3686 __receive_convert_reply(r, lkb, &r->res_ls->ls_stub_ms);
3687 }
3688
3689 return error;
3690}
3691
3692/* FIXME: if this lkb is the only lock we hold on the rsb, then set
3693 MASTER_UNCERTAIN to force the next request on the rsb to confirm
3694 that the master is still correct. */
3695
3696static int send_unlock(struct dlm_rsb *r, struct dlm_lkb *lkb)
3697{
3698 return send_common(r, lkb, DLM_MSG_UNLOCK);
3699}
3700
3701static int send_cancel(struct dlm_rsb *r, struct dlm_lkb *lkb)
3702{
3703 return send_common(r, lkb, DLM_MSG_CANCEL);
3704}
3705
3706static int send_grant(struct dlm_rsb *r, struct dlm_lkb *lkb)
3707{
3708 struct dlm_message *ms;
3709 struct dlm_mhandle *mh;
3710 int to_nodeid, error;
3711
3712 to_nodeid = lkb->lkb_nodeid;
3713
3714 error = create_message(r, lkb, to_nodeid, DLM_MSG_GRANT, &ms, &mh);
3715 if (error)
3716 goto out;
3717
3718 send_args(r, lkb, ms);
3719
3720 ms->m_result = 0;
3721
3722 error = send_message(mh, ms);
3723 out:
3724 return error;
3725}
3726
3727static int send_bast(struct dlm_rsb *r, struct dlm_lkb *lkb, int mode)
3728{
3729 struct dlm_message *ms;
3730 struct dlm_mhandle *mh;
3731 int to_nodeid, error;
3732
3733 to_nodeid = lkb->lkb_nodeid;
3734
3735 error = create_message(r, NULL, to_nodeid, DLM_MSG_BAST, &ms, &mh);
3736 if (error)
3737 goto out;
3738
3739 send_args(r, lkb, ms);
3740
3741 ms->m_bastmode = mode;
3742
3743 error = send_message(mh, ms);
3744 out:
3745 return error;
3746}
3747
3748static int send_lookup(struct dlm_rsb *r, struct dlm_lkb *lkb)
3749{
3750 struct dlm_message *ms;
3751 struct dlm_mhandle *mh;
3752 int to_nodeid, error;
3753
David Teiglandc6ff6692011-03-28 14:17:26 -05003754 to_nodeid = dlm_dir_nodeid(r);
3755
3756 error = add_to_waiters(lkb, DLM_MSG_LOOKUP, to_nodeid);
David Teiglandef0c2bb2007-03-28 09:56:46 -05003757 if (error)
3758 return error;
David Teiglande7fd4172006-01-18 09:30:29 +00003759
David Teiglande7fd4172006-01-18 09:30:29 +00003760 error = create_message(r, NULL, to_nodeid, DLM_MSG_LOOKUP, &ms, &mh);
3761 if (error)
3762 goto fail;
3763
3764 send_args(r, lkb, ms);
3765
3766 error = send_message(mh, ms);
3767 if (error)
3768 goto fail;
3769 return 0;
3770
3771 fail:
David Teiglandef0c2bb2007-03-28 09:56:46 -05003772 remove_from_waiters(lkb, DLM_MSG_LOOKUP_REPLY);
David Teiglande7fd4172006-01-18 09:30:29 +00003773 return error;
3774}
3775
3776static int send_remove(struct dlm_rsb *r)
3777{
3778 struct dlm_message *ms;
3779 struct dlm_mhandle *mh;
3780 int to_nodeid, error;
3781
3782 to_nodeid = dlm_dir_nodeid(r);
3783
3784 error = create_message(r, NULL, to_nodeid, DLM_MSG_REMOVE, &ms, &mh);
3785 if (error)
3786 goto out;
3787
3788 memcpy(ms->m_extra, r->res_name, r->res_length);
3789 ms->m_hash = r->res_hash;
3790
3791 error = send_message(mh, ms);
3792 out:
3793 return error;
3794}
3795
3796static int send_common_reply(struct dlm_rsb *r, struct dlm_lkb *lkb,
3797 int mstype, int rv)
3798{
3799 struct dlm_message *ms;
3800 struct dlm_mhandle *mh;
3801 int to_nodeid, error;
3802
3803 to_nodeid = lkb->lkb_nodeid;
3804
3805 error = create_message(r, lkb, to_nodeid, mstype, &ms, &mh);
3806 if (error)
3807 goto out;
3808
3809 send_args(r, lkb, ms);
3810
3811 ms->m_result = rv;
3812
3813 error = send_message(mh, ms);
3814 out:
3815 return error;
3816}
3817
3818static int send_request_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv)
3819{
3820 return send_common_reply(r, lkb, DLM_MSG_REQUEST_REPLY, rv);
3821}
3822
3823static int send_convert_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv)
3824{
3825 return send_common_reply(r, lkb, DLM_MSG_CONVERT_REPLY, rv);
3826}
3827
3828static int send_unlock_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv)
3829{
3830 return send_common_reply(r, lkb, DLM_MSG_UNLOCK_REPLY, rv);
3831}
3832
3833static int send_cancel_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv)
3834{
3835 return send_common_reply(r, lkb, DLM_MSG_CANCEL_REPLY, rv);
3836}
3837
3838static int send_lookup_reply(struct dlm_ls *ls, struct dlm_message *ms_in,
3839 int ret_nodeid, int rv)
3840{
3841 struct dlm_rsb *r = &ls->ls_stub_rsb;
3842 struct dlm_message *ms;
3843 struct dlm_mhandle *mh;
3844 int error, nodeid = ms_in->m_header.h_nodeid;
3845
3846 error = create_message(r, NULL, nodeid, DLM_MSG_LOOKUP_REPLY, &ms, &mh);
3847 if (error)
3848 goto out;
3849
3850 ms->m_lkid = ms_in->m_lkid;
3851 ms->m_result = rv;
3852 ms->m_nodeid = ret_nodeid;
3853
3854 error = send_message(mh, ms);
3855 out:
3856 return error;
3857}
3858
3859/* which args we save from a received message depends heavily on the type
3860 of message, unlike the send side where we can safely send everything about
3861 the lkb for any type of message */
3862
3863static void receive_flags(struct dlm_lkb *lkb, struct dlm_message *ms)
3864{
3865 lkb->lkb_exflags = ms->m_exflags;
David Teigland6f90a8b12006-11-10 14:16:27 -06003866 lkb->lkb_sbflags = ms->m_sbflags;
David Teiglande7fd4172006-01-18 09:30:29 +00003867 lkb->lkb_flags = (lkb->lkb_flags & 0xFFFF0000) |
3868 (ms->m_flags & 0x0000FFFF);
3869}
3870
3871static void receive_flags_reply(struct dlm_lkb *lkb, struct dlm_message *ms)
3872{
David Teigland2a7ce0e2011-04-04 15:19:59 -05003873 if (ms->m_flags == DLM_IFL_STUB_MS)
3874 return;
3875
David Teiglande7fd4172006-01-18 09:30:29 +00003876 lkb->lkb_sbflags = ms->m_sbflags;
3877 lkb->lkb_flags = (lkb->lkb_flags & 0xFFFF0000) |
3878 (ms->m_flags & 0x0000FFFF);
3879}
3880
3881static int receive_extralen(struct dlm_message *ms)
3882{
3883 return (ms->m_header.h_length - sizeof(struct dlm_message));
3884}
3885
David Teiglande7fd4172006-01-18 09:30:29 +00003886static int receive_lvb(struct dlm_ls *ls, struct dlm_lkb *lkb,
3887 struct dlm_message *ms)
3888{
3889 int len;
3890
3891 if (lkb->lkb_exflags & DLM_LKF_VALBLK) {
3892 if (!lkb->lkb_lvbptr)
David Teigland52bda2b2007-11-07 09:06:49 -06003893 lkb->lkb_lvbptr = dlm_allocate_lvb(ls);
David Teiglande7fd4172006-01-18 09:30:29 +00003894 if (!lkb->lkb_lvbptr)
3895 return -ENOMEM;
3896 len = receive_extralen(ms);
Bart Van Asschecfa805f2013-06-26 14:27:57 +02003897 if (len > ls->ls_lvblen)
3898 len = ls->ls_lvblen;
David Teiglande7fd4172006-01-18 09:30:29 +00003899 memcpy(lkb->lkb_lvbptr, ms->m_extra, len);
3900 }
3901 return 0;
3902}
3903
David Teiglande5dae542008-02-06 00:35:45 -06003904static void fake_bastfn(void *astparam, int mode)
3905{
3906 log_print("fake_bastfn should not be called");
3907}
3908
3909static void fake_astfn(void *astparam)
3910{
3911 log_print("fake_astfn should not be called");
3912}
3913
David Teiglande7fd4172006-01-18 09:30:29 +00003914static int receive_request_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
3915 struct dlm_message *ms)
3916{
3917 lkb->lkb_nodeid = ms->m_header.h_nodeid;
3918 lkb->lkb_ownpid = ms->m_pid;
3919 lkb->lkb_remid = ms->m_lkid;
3920 lkb->lkb_grmode = DLM_LOCK_IV;
3921 lkb->lkb_rqmode = ms->m_rqmode;
David Teiglande5dae542008-02-06 00:35:45 -06003922
David Teigland8304d6f2011-02-21 14:58:21 -06003923 lkb->lkb_bastfn = (ms->m_asts & DLM_CB_BAST) ? &fake_bastfn : NULL;
3924 lkb->lkb_astfn = (ms->m_asts & DLM_CB_CAST) ? &fake_astfn : NULL;
David Teiglande7fd4172006-01-18 09:30:29 +00003925
David Teigland8d07fd52006-12-13 10:39:20 -06003926 if (lkb->lkb_exflags & DLM_LKF_VALBLK) {
3927 /* lkb was just created so there won't be an lvb yet */
David Teigland52bda2b2007-11-07 09:06:49 -06003928 lkb->lkb_lvbptr = dlm_allocate_lvb(ls);
David Teigland8d07fd52006-12-13 10:39:20 -06003929 if (!lkb->lkb_lvbptr)
3930 return -ENOMEM;
3931 }
David Teiglande7fd4172006-01-18 09:30:29 +00003932
3933 return 0;
3934}
3935
3936static int receive_convert_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
3937 struct dlm_message *ms)
3938{
David Teiglande7fd4172006-01-18 09:30:29 +00003939 if (lkb->lkb_status != DLM_LKSTS_GRANTED)
3940 return -EBUSY;
3941
David Teiglande7fd4172006-01-18 09:30:29 +00003942 if (receive_lvb(ls, lkb, ms))
3943 return -ENOMEM;
3944
3945 lkb->lkb_rqmode = ms->m_rqmode;
3946 lkb->lkb_lvbseq = ms->m_lvbseq;
3947
3948 return 0;
3949}
3950
3951static int receive_unlock_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
3952 struct dlm_message *ms)
3953{
David Teiglande7fd4172006-01-18 09:30:29 +00003954 if (receive_lvb(ls, lkb, ms))
3955 return -ENOMEM;
3956 return 0;
3957}
3958
3959/* We fill in the stub-lkb fields with the info that send_xxxx_reply()
3960 uses to send a reply and that the remote end uses to process the reply. */
3961
3962static void setup_stub_lkb(struct dlm_ls *ls, struct dlm_message *ms)
3963{
3964 struct dlm_lkb *lkb = &ls->ls_stub_lkb;
3965 lkb->lkb_nodeid = ms->m_header.h_nodeid;
3966 lkb->lkb_remid = ms->m_lkid;
3967}
3968
David Teiglandc54e04b2008-01-09 09:59:41 -06003969/* This is called after the rsb is locked so that we can safely inspect
3970 fields in the lkb. */
3971
3972static int validate_message(struct dlm_lkb *lkb, struct dlm_message *ms)
3973{
3974 int from = ms->m_header.h_nodeid;
3975 int error = 0;
3976
3977 switch (ms->m_type) {
3978 case DLM_MSG_CONVERT:
3979 case DLM_MSG_UNLOCK:
3980 case DLM_MSG_CANCEL:
3981 if (!is_master_copy(lkb) || lkb->lkb_nodeid != from)
3982 error = -EINVAL;
3983 break;
3984
3985 case DLM_MSG_CONVERT_REPLY:
3986 case DLM_MSG_UNLOCK_REPLY:
3987 case DLM_MSG_CANCEL_REPLY:
3988 case DLM_MSG_GRANT:
3989 case DLM_MSG_BAST:
3990 if (!is_process_copy(lkb) || lkb->lkb_nodeid != from)
3991 error = -EINVAL;
3992 break;
3993
3994 case DLM_MSG_REQUEST_REPLY:
3995 if (!is_process_copy(lkb))
3996 error = -EINVAL;
3997 else if (lkb->lkb_nodeid != -1 && lkb->lkb_nodeid != from)
3998 error = -EINVAL;
3999 break;
4000
4001 default:
4002 error = -EINVAL;
4003 }
4004
4005 if (error)
4006 log_error(lkb->lkb_resource->res_ls,
4007 "ignore invalid message %d from %d %x %x %x %d",
4008 ms->m_type, from, lkb->lkb_id, lkb->lkb_remid,
4009 lkb->lkb_flags, lkb->lkb_nodeid);
4010 return error;
4011}
4012
David Teigland96006ea2012-06-25 13:48:05 -05004013static void send_repeat_remove(struct dlm_ls *ls, char *ms_name, int len)
4014{
4015 char name[DLM_RESNAME_MAXLEN + 1];
4016 struct dlm_message *ms;
4017 struct dlm_mhandle *mh;
4018 struct dlm_rsb *r;
4019 uint32_t hash, b;
4020 int rv, dir_nodeid;
4021
4022 memset(name, 0, sizeof(name));
4023 memcpy(name, ms_name, len);
4024
4025 hash = jhash(name, len, 0);
4026 b = hash & (ls->ls_rsbtbl_size - 1);
4027
4028 dir_nodeid = dlm_hash2nodeid(ls, hash);
4029
4030 log_error(ls, "send_repeat_remove dir %d %s", dir_nodeid, name);
4031
4032 spin_lock(&ls->ls_rsbtbl[b].lock);
4033 rv = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].keep, name, len, &r);
4034 if (!rv) {
4035 spin_unlock(&ls->ls_rsbtbl[b].lock);
4036 log_error(ls, "repeat_remove on keep %s", name);
4037 return;
4038 }
4039
4040 rv = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].toss, name, len, &r);
4041 if (!rv) {
4042 spin_unlock(&ls->ls_rsbtbl[b].lock);
4043 log_error(ls, "repeat_remove on toss %s", name);
4044 return;
4045 }
4046
4047 /* use ls->remove_name2 to avoid conflict with shrink? */
4048
4049 spin_lock(&ls->ls_remove_spin);
4050 ls->ls_remove_len = len;
4051 memcpy(ls->ls_remove_name, name, DLM_RESNAME_MAXLEN);
4052 spin_unlock(&ls->ls_remove_spin);
4053 spin_unlock(&ls->ls_rsbtbl[b].lock);
4054
4055 rv = _create_message(ls, sizeof(struct dlm_message) + len,
4056 dir_nodeid, DLM_MSG_REMOVE, &ms, &mh);
4057 if (rv)
4058 return;
4059
4060 memcpy(ms->m_extra, name, len);
4061 ms->m_hash = hash;
4062
4063 send_message(mh, ms);
4064
4065 spin_lock(&ls->ls_remove_spin);
4066 ls->ls_remove_len = 0;
4067 memset(ls->ls_remove_name, 0, DLM_RESNAME_MAXLEN);
4068 spin_unlock(&ls->ls_remove_spin);
4069}
4070
David Teigland6d40c4a2012-04-23 16:36:01 -05004071static int receive_request(struct dlm_ls *ls, struct dlm_message *ms)
David Teiglande7fd4172006-01-18 09:30:29 +00004072{
4073 struct dlm_lkb *lkb;
4074 struct dlm_rsb *r;
David Teiglandc04fecb2012-05-10 10:18:07 -05004075 int from_nodeid;
David Teigland96006ea2012-06-25 13:48:05 -05004076 int error, namelen = 0;
David Teiglande7fd4172006-01-18 09:30:29 +00004077
David Teiglandc04fecb2012-05-10 10:18:07 -05004078 from_nodeid = ms->m_header.h_nodeid;
4079
David Teiglande7fd4172006-01-18 09:30:29 +00004080 error = create_lkb(ls, &lkb);
4081 if (error)
4082 goto fail;
4083
4084 receive_flags(lkb, ms);
4085 lkb->lkb_flags |= DLM_IFL_MSTCPY;
4086 error = receive_request_args(ls, lkb, ms);
4087 if (error) {
David Teiglandb3f58d82006-02-28 11:16:37 -05004088 __put_lkb(ls, lkb);
David Teiglande7fd4172006-01-18 09:30:29 +00004089 goto fail;
4090 }
4091
David Teiglandc04fecb2012-05-10 10:18:07 -05004092 /* The dir node is the authority on whether we are the master
4093 for this rsb or not, so if the master sends us a request, we should
4094 recreate the rsb if we've destroyed it. This race happens when we
4095 send a remove message to the dir node at the same time that the dir
4096 node sends us a request for the rsb. */
4097
David Teiglande7fd4172006-01-18 09:30:29 +00004098 namelen = receive_extralen(ms);
4099
David Teiglandc04fecb2012-05-10 10:18:07 -05004100 error = find_rsb(ls, ms->m_extra, namelen, from_nodeid,
4101 R_RECEIVE_REQUEST, &r);
David Teiglande7fd4172006-01-18 09:30:29 +00004102 if (error) {
David Teiglandb3f58d82006-02-28 11:16:37 -05004103 __put_lkb(ls, lkb);
David Teiglande7fd4172006-01-18 09:30:29 +00004104 goto fail;
4105 }
4106
4107 lock_rsb(r);
4108
David Teiglandc04fecb2012-05-10 10:18:07 -05004109 if (r->res_master_nodeid != dlm_our_nodeid()) {
4110 error = validate_master_nodeid(ls, r, from_nodeid);
4111 if (error) {
4112 unlock_rsb(r);
4113 put_rsb(r);
4114 __put_lkb(ls, lkb);
4115 goto fail;
4116 }
4117 }
4118
David Teiglande7fd4172006-01-18 09:30:29 +00004119 attach_lkb(r, lkb);
4120 error = do_request(r, lkb);
4121 send_request_reply(r, lkb, error);
David Teiglandcf6620a2010-02-24 11:59:23 -06004122 do_request_effects(r, lkb, error);
David Teiglande7fd4172006-01-18 09:30:29 +00004123
4124 unlock_rsb(r);
4125 put_rsb(r);
4126
4127 if (error == -EINPROGRESS)
4128 error = 0;
4129 if (error)
David Teiglandb3f58d82006-02-28 11:16:37 -05004130 dlm_put_lkb(lkb);
David Teigland6d40c4a2012-04-23 16:36:01 -05004131 return 0;
David Teiglande7fd4172006-01-18 09:30:29 +00004132
4133 fail:
David Teiglandc04fecb2012-05-10 10:18:07 -05004134 /* TODO: instead of returning ENOTBLK, add the lkb to res_lookup
4135 and do this receive_request again from process_lookup_list once
4136 we get the lookup reply. This would avoid a many repeated
4137 ENOTBLK request failures when the lookup reply designating us
4138 as master is delayed. */
4139
4140 /* We could repeatedly return -EBADR here if our send_remove() is
4141 delayed in being sent/arriving/being processed on the dir node.
4142 Another node would repeatedly lookup up the master, and the dir
4143 node would continue returning our nodeid until our send_remove
David Teigland96006ea2012-06-25 13:48:05 -05004144 took effect.
4145
4146 We send another remove message in case our previous send_remove
4147 was lost/ignored/missed somehow. */
David Teiglandc04fecb2012-05-10 10:18:07 -05004148
4149 if (error != -ENOTBLK) {
4150 log_limit(ls, "receive_request %x from %d %d",
4151 ms->m_lkid, from_nodeid, error);
4152 }
4153
David Teigland96006ea2012-06-25 13:48:05 -05004154 if (namelen && error == -EBADR) {
4155 send_repeat_remove(ls, ms->m_extra, namelen);
4156 msleep(1000);
4157 }
4158
David Teiglande7fd4172006-01-18 09:30:29 +00004159 setup_stub_lkb(ls, ms);
4160 send_request_reply(&ls->ls_stub_rsb, &ls->ls_stub_lkb, error);
David Teigland6d40c4a2012-04-23 16:36:01 -05004161 return error;
David Teiglande7fd4172006-01-18 09:30:29 +00004162}
4163
David Teigland6d40c4a2012-04-23 16:36:01 -05004164static int receive_convert(struct dlm_ls *ls, struct dlm_message *ms)
David Teiglande7fd4172006-01-18 09:30:29 +00004165{
4166 struct dlm_lkb *lkb;
4167 struct dlm_rsb *r;
David Teigland90135922006-01-20 08:47:07 +00004168 int error, reply = 1;
David Teiglande7fd4172006-01-18 09:30:29 +00004169
4170 error = find_lkb(ls, ms->m_remid, &lkb);
4171 if (error)
4172 goto fail;
4173
David Teigland6d40c4a2012-04-23 16:36:01 -05004174 if (lkb->lkb_remid != ms->m_lkid) {
David Teigland48756472012-04-26 15:54:29 -05004175 log_error(ls, "receive_convert %x remid %x recover_seq %llu "
4176 "remote %d %x", lkb->lkb_id, lkb->lkb_remid,
4177 (unsigned long long)lkb->lkb_recover_seq,
David Teigland6d40c4a2012-04-23 16:36:01 -05004178 ms->m_header.h_nodeid, ms->m_lkid);
4179 error = -ENOENT;
4180 goto fail;
4181 }
4182
David Teiglande7fd4172006-01-18 09:30:29 +00004183 r = lkb->lkb_resource;
4184
4185 hold_rsb(r);
4186 lock_rsb(r);
4187
David Teiglandc54e04b2008-01-09 09:59:41 -06004188 error = validate_message(lkb, ms);
4189 if (error)
4190 goto out;
4191
David Teiglande7fd4172006-01-18 09:30:29 +00004192 receive_flags(lkb, ms);
David Teiglandcf6620a2010-02-24 11:59:23 -06004193
David Teiglande7fd4172006-01-18 09:30:29 +00004194 error = receive_convert_args(ls, lkb, ms);
David Teiglandcf6620a2010-02-24 11:59:23 -06004195 if (error) {
4196 send_convert_reply(r, lkb, error);
4197 goto out;
4198 }
4199
David Teiglande7fd4172006-01-18 09:30:29 +00004200 reply = !down_conversion(lkb);
4201
4202 error = do_convert(r, lkb);
David Teiglande7fd4172006-01-18 09:30:29 +00004203 if (reply)
4204 send_convert_reply(r, lkb, error);
David Teiglandcf6620a2010-02-24 11:59:23 -06004205 do_convert_effects(r, lkb, error);
David Teiglandc54e04b2008-01-09 09:59:41 -06004206 out:
David Teiglande7fd4172006-01-18 09:30:29 +00004207 unlock_rsb(r);
4208 put_rsb(r);
David Teiglandb3f58d82006-02-28 11:16:37 -05004209 dlm_put_lkb(lkb);
David Teigland6d40c4a2012-04-23 16:36:01 -05004210 return 0;
David Teiglande7fd4172006-01-18 09:30:29 +00004211
4212 fail:
4213 setup_stub_lkb(ls, ms);
4214 send_convert_reply(&ls->ls_stub_rsb, &ls->ls_stub_lkb, error);
David Teigland6d40c4a2012-04-23 16:36:01 -05004215 return error;
David Teiglande7fd4172006-01-18 09:30:29 +00004216}
4217
David Teigland6d40c4a2012-04-23 16:36:01 -05004218static int receive_unlock(struct dlm_ls *ls, struct dlm_message *ms)
David Teiglande7fd4172006-01-18 09:30:29 +00004219{
4220 struct dlm_lkb *lkb;
4221 struct dlm_rsb *r;
4222 int error;
4223
4224 error = find_lkb(ls, ms->m_remid, &lkb);
4225 if (error)
4226 goto fail;
4227
David Teigland6d40c4a2012-04-23 16:36:01 -05004228 if (lkb->lkb_remid != ms->m_lkid) {
4229 log_error(ls, "receive_unlock %x remid %x remote %d %x",
4230 lkb->lkb_id, lkb->lkb_remid,
4231 ms->m_header.h_nodeid, ms->m_lkid);
4232 error = -ENOENT;
4233 goto fail;
4234 }
4235
David Teiglande7fd4172006-01-18 09:30:29 +00004236 r = lkb->lkb_resource;
4237
4238 hold_rsb(r);
4239 lock_rsb(r);
4240
David Teiglandc54e04b2008-01-09 09:59:41 -06004241 error = validate_message(lkb, ms);
David Teiglande7fd4172006-01-18 09:30:29 +00004242 if (error)
4243 goto out;
4244
David Teiglandc54e04b2008-01-09 09:59:41 -06004245 receive_flags(lkb, ms);
David Teiglandcf6620a2010-02-24 11:59:23 -06004246
David Teiglandc54e04b2008-01-09 09:59:41 -06004247 error = receive_unlock_args(ls, lkb, ms);
David Teiglandcf6620a2010-02-24 11:59:23 -06004248 if (error) {
4249 send_unlock_reply(r, lkb, error);
4250 goto out;
4251 }
David Teiglande7fd4172006-01-18 09:30:29 +00004252
David Teiglandc54e04b2008-01-09 09:59:41 -06004253 error = do_unlock(r, lkb);
David Teiglandc54e04b2008-01-09 09:59:41 -06004254 send_unlock_reply(r, lkb, error);
David Teiglandcf6620a2010-02-24 11:59:23 -06004255 do_unlock_effects(r, lkb, error);
David Teiglandc54e04b2008-01-09 09:59:41 -06004256 out:
David Teiglande7fd4172006-01-18 09:30:29 +00004257 unlock_rsb(r);
4258 put_rsb(r);
David Teiglandb3f58d82006-02-28 11:16:37 -05004259 dlm_put_lkb(lkb);
David Teigland6d40c4a2012-04-23 16:36:01 -05004260 return 0;
David Teiglande7fd4172006-01-18 09:30:29 +00004261
4262 fail:
4263 setup_stub_lkb(ls, ms);
4264 send_unlock_reply(&ls->ls_stub_rsb, &ls->ls_stub_lkb, error);
David Teigland6d40c4a2012-04-23 16:36:01 -05004265 return error;
David Teiglande7fd4172006-01-18 09:30:29 +00004266}
4267
David Teigland6d40c4a2012-04-23 16:36:01 -05004268static int receive_cancel(struct dlm_ls *ls, struct dlm_message *ms)
David Teiglande7fd4172006-01-18 09:30:29 +00004269{
4270 struct dlm_lkb *lkb;
4271 struct dlm_rsb *r;
4272 int error;
4273
4274 error = find_lkb(ls, ms->m_remid, &lkb);
4275 if (error)
4276 goto fail;
4277
4278 receive_flags(lkb, ms);
4279
4280 r = lkb->lkb_resource;
4281
4282 hold_rsb(r);
4283 lock_rsb(r);
4284
David Teiglandc54e04b2008-01-09 09:59:41 -06004285 error = validate_message(lkb, ms);
4286 if (error)
4287 goto out;
4288
David Teiglande7fd4172006-01-18 09:30:29 +00004289 error = do_cancel(r, lkb);
4290 send_cancel_reply(r, lkb, error);
David Teiglandcf6620a2010-02-24 11:59:23 -06004291 do_cancel_effects(r, lkb, error);
David Teiglandc54e04b2008-01-09 09:59:41 -06004292 out:
David Teiglande7fd4172006-01-18 09:30:29 +00004293 unlock_rsb(r);
4294 put_rsb(r);
David Teiglandb3f58d82006-02-28 11:16:37 -05004295 dlm_put_lkb(lkb);
David Teigland6d40c4a2012-04-23 16:36:01 -05004296 return 0;
David Teiglande7fd4172006-01-18 09:30:29 +00004297
4298 fail:
4299 setup_stub_lkb(ls, ms);
4300 send_cancel_reply(&ls->ls_stub_rsb, &ls->ls_stub_lkb, error);
David Teigland6d40c4a2012-04-23 16:36:01 -05004301 return error;
David Teiglande7fd4172006-01-18 09:30:29 +00004302}
4303
David Teigland6d40c4a2012-04-23 16:36:01 -05004304static int receive_grant(struct dlm_ls *ls, struct dlm_message *ms)
David Teiglande7fd4172006-01-18 09:30:29 +00004305{
4306 struct dlm_lkb *lkb;
4307 struct dlm_rsb *r;
4308 int error;
4309
4310 error = find_lkb(ls, ms->m_remid, &lkb);
David Teigland6d40c4a2012-04-23 16:36:01 -05004311 if (error)
4312 return error;
David Teiglande7fd4172006-01-18 09:30:29 +00004313
4314 r = lkb->lkb_resource;
4315
4316 hold_rsb(r);
4317 lock_rsb(r);
4318
David Teiglandc54e04b2008-01-09 09:59:41 -06004319 error = validate_message(lkb, ms);
4320 if (error)
4321 goto out;
4322
David Teiglande7fd4172006-01-18 09:30:29 +00004323 receive_flags_reply(lkb, ms);
David Teigland7d3c1fe2007-04-19 10:30:41 -05004324 if (is_altmode(lkb))
4325 munge_altmode(lkb, ms);
David Teiglande7fd4172006-01-18 09:30:29 +00004326 grant_lock_pc(r, lkb, ms);
4327 queue_cast(r, lkb, 0);
David Teiglandc54e04b2008-01-09 09:59:41 -06004328 out:
David Teiglande7fd4172006-01-18 09:30:29 +00004329 unlock_rsb(r);
4330 put_rsb(r);
David Teiglandb3f58d82006-02-28 11:16:37 -05004331 dlm_put_lkb(lkb);
David Teigland6d40c4a2012-04-23 16:36:01 -05004332 return 0;
David Teiglande7fd4172006-01-18 09:30:29 +00004333}
4334
David Teigland6d40c4a2012-04-23 16:36:01 -05004335static int receive_bast(struct dlm_ls *ls, struct dlm_message *ms)
David Teiglande7fd4172006-01-18 09:30:29 +00004336{
4337 struct dlm_lkb *lkb;
4338 struct dlm_rsb *r;
4339 int error;
4340
4341 error = find_lkb(ls, ms->m_remid, &lkb);
David Teigland6d40c4a2012-04-23 16:36:01 -05004342 if (error)
4343 return error;
David Teiglande7fd4172006-01-18 09:30:29 +00004344
4345 r = lkb->lkb_resource;
4346
4347 hold_rsb(r);
4348 lock_rsb(r);
4349
David Teiglandc54e04b2008-01-09 09:59:41 -06004350 error = validate_message(lkb, ms);
4351 if (error)
4352 goto out;
David Teiglande7fd4172006-01-18 09:30:29 +00004353
David Teiglandc54e04b2008-01-09 09:59:41 -06004354 queue_bast(r, lkb, ms->m_bastmode);
David Teigland48756472012-04-26 15:54:29 -05004355 lkb->lkb_highbast = ms->m_bastmode;
David Teiglandc54e04b2008-01-09 09:59:41 -06004356 out:
David Teiglande7fd4172006-01-18 09:30:29 +00004357 unlock_rsb(r);
4358 put_rsb(r);
David Teiglandb3f58d82006-02-28 11:16:37 -05004359 dlm_put_lkb(lkb);
David Teigland6d40c4a2012-04-23 16:36:01 -05004360 return 0;
David Teiglande7fd4172006-01-18 09:30:29 +00004361}
4362
4363static void receive_lookup(struct dlm_ls *ls, struct dlm_message *ms)
4364{
David Teiglandc04fecb2012-05-10 10:18:07 -05004365 int len, error, ret_nodeid, from_nodeid, our_nodeid;
David Teiglande7fd4172006-01-18 09:30:29 +00004366
4367 from_nodeid = ms->m_header.h_nodeid;
4368 our_nodeid = dlm_our_nodeid();
4369
4370 len = receive_extralen(ms);
4371
David Teiglandc04fecb2012-05-10 10:18:07 -05004372 error = dlm_master_lookup(ls, from_nodeid, ms->m_extra, len, 0,
4373 &ret_nodeid, NULL);
David Teiglande7fd4172006-01-18 09:30:29 +00004374
4375 /* Optimization: we're master so treat lookup as a request */
4376 if (!error && ret_nodeid == our_nodeid) {
4377 receive_request(ls, ms);
4378 return;
4379 }
David Teiglande7fd4172006-01-18 09:30:29 +00004380 send_lookup_reply(ls, ms, ret_nodeid, error);
4381}
4382
4383static void receive_remove(struct dlm_ls *ls, struct dlm_message *ms)
4384{
David Teiglandc04fecb2012-05-10 10:18:07 -05004385 char name[DLM_RESNAME_MAXLEN+1];
4386 struct dlm_rsb *r;
4387 uint32_t hash, b;
4388 int rv, len, dir_nodeid, from_nodeid;
David Teiglande7fd4172006-01-18 09:30:29 +00004389
4390 from_nodeid = ms->m_header.h_nodeid;
4391
4392 len = receive_extralen(ms);
4393
David Teiglandc04fecb2012-05-10 10:18:07 -05004394 if (len > DLM_RESNAME_MAXLEN) {
4395 log_error(ls, "receive_remove from %d bad len %d",
4396 from_nodeid, len);
David Teiglande7fd4172006-01-18 09:30:29 +00004397 return;
4398 }
4399
David Teiglandc04fecb2012-05-10 10:18:07 -05004400 dir_nodeid = dlm_hash2nodeid(ls, ms->m_hash);
4401 if (dir_nodeid != dlm_our_nodeid()) {
4402 log_error(ls, "receive_remove from %d bad nodeid %d",
4403 from_nodeid, dir_nodeid);
4404 return;
4405 }
4406
4407 /* Look for name on rsbtbl.toss, if it's there, kill it.
4408 If it's on rsbtbl.keep, it's being used, and we should ignore this
4409 message. This is an expected race between the dir node sending a
4410 request to the master node at the same time as the master node sends
4411 a remove to the dir node. The resolution to that race is for the
4412 dir node to ignore the remove message, and the master node to
4413 recreate the master rsb when it gets a request from the dir node for
4414 an rsb it doesn't have. */
4415
4416 memset(name, 0, sizeof(name));
4417 memcpy(name, ms->m_extra, len);
4418
4419 hash = jhash(name, len, 0);
4420 b = hash & (ls->ls_rsbtbl_size - 1);
4421
4422 spin_lock(&ls->ls_rsbtbl[b].lock);
4423
4424 rv = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].toss, name, len, &r);
4425 if (rv) {
4426 /* verify the rsb is on keep list per comment above */
4427 rv = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].keep, name, len, &r);
4428 if (rv) {
4429 /* should not happen */
4430 log_error(ls, "receive_remove from %d not found %s",
4431 from_nodeid, name);
4432 spin_unlock(&ls->ls_rsbtbl[b].lock);
4433 return;
4434 }
4435 if (r->res_master_nodeid != from_nodeid) {
4436 /* should not happen */
4437 log_error(ls, "receive_remove keep from %d master %d",
4438 from_nodeid, r->res_master_nodeid);
4439 dlm_print_rsb(r);
4440 spin_unlock(&ls->ls_rsbtbl[b].lock);
4441 return;
4442 }
4443
4444 log_debug(ls, "receive_remove from %d master %d first %x %s",
4445 from_nodeid, r->res_master_nodeid, r->res_first_lkid,
4446 name);
4447 spin_unlock(&ls->ls_rsbtbl[b].lock);
4448 return;
4449 }
4450
4451 if (r->res_master_nodeid != from_nodeid) {
4452 log_error(ls, "receive_remove toss from %d master %d",
4453 from_nodeid, r->res_master_nodeid);
4454 dlm_print_rsb(r);
4455 spin_unlock(&ls->ls_rsbtbl[b].lock);
4456 return;
4457 }
4458
4459 if (kref_put(&r->res_ref, kill_rsb)) {
4460 rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[b].toss);
4461 spin_unlock(&ls->ls_rsbtbl[b].lock);
4462 dlm_free_rsb(r);
4463 } else {
4464 log_error(ls, "receive_remove from %d rsb ref error",
4465 from_nodeid);
4466 dlm_print_rsb(r);
4467 spin_unlock(&ls->ls_rsbtbl[b].lock);
4468 }
David Teiglande7fd4172006-01-18 09:30:29 +00004469}
4470
David Teigland84991372007-03-30 15:02:40 -05004471static void receive_purge(struct dlm_ls *ls, struct dlm_message *ms)
4472{
4473 do_purge(ls, ms->m_nodeid, ms->m_pid);
4474}
4475
David Teigland6d40c4a2012-04-23 16:36:01 -05004476static int receive_request_reply(struct dlm_ls *ls, struct dlm_message *ms)
David Teiglande7fd4172006-01-18 09:30:29 +00004477{
4478 struct dlm_lkb *lkb;
4479 struct dlm_rsb *r;
David Teiglandef0c2bb2007-03-28 09:56:46 -05004480 int error, mstype, result;
David Teiglandc04fecb2012-05-10 10:18:07 -05004481 int from_nodeid = ms->m_header.h_nodeid;
David Teiglande7fd4172006-01-18 09:30:29 +00004482
4483 error = find_lkb(ls, ms->m_remid, &lkb);
David Teigland6d40c4a2012-04-23 16:36:01 -05004484 if (error)
4485 return error;
David Teiglande7fd4172006-01-18 09:30:29 +00004486
David Teiglande7fd4172006-01-18 09:30:29 +00004487 r = lkb->lkb_resource;
4488 hold_rsb(r);
4489 lock_rsb(r);
4490
David Teiglandc54e04b2008-01-09 09:59:41 -06004491 error = validate_message(lkb, ms);
4492 if (error)
4493 goto out;
4494
David Teiglandef0c2bb2007-03-28 09:56:46 -05004495 mstype = lkb->lkb_wait_type;
4496 error = remove_from_waiters(lkb, DLM_MSG_REQUEST_REPLY);
David Teigland48756472012-04-26 15:54:29 -05004497 if (error) {
4498 log_error(ls, "receive_request_reply %x remote %d %x result %d",
David Teiglandc04fecb2012-05-10 10:18:07 -05004499 lkb->lkb_id, from_nodeid, ms->m_lkid, ms->m_result);
David Teigland48756472012-04-26 15:54:29 -05004500 dlm_dump_rsb(r);
David Teiglandef0c2bb2007-03-28 09:56:46 -05004501 goto out;
David Teigland48756472012-04-26 15:54:29 -05004502 }
David Teiglandef0c2bb2007-03-28 09:56:46 -05004503
David Teiglande7fd4172006-01-18 09:30:29 +00004504 /* Optimization: the dir node was also the master, so it took our
4505 lookup as a request and sent request reply instead of lookup reply */
4506 if (mstype == DLM_MSG_LOOKUP) {
David Teiglandc04fecb2012-05-10 10:18:07 -05004507 r->res_master_nodeid = from_nodeid;
4508 r->res_nodeid = from_nodeid;
4509 lkb->lkb_nodeid = from_nodeid;
David Teiglande7fd4172006-01-18 09:30:29 +00004510 }
4511
David Teiglandef0c2bb2007-03-28 09:56:46 -05004512 /* this is the value returned from do_request() on the master */
4513 result = ms->m_result;
4514
4515 switch (result) {
David Teiglande7fd4172006-01-18 09:30:29 +00004516 case -EAGAIN:
David Teiglandef0c2bb2007-03-28 09:56:46 -05004517 /* request would block (be queued) on remote master */
David Teiglande7fd4172006-01-18 09:30:29 +00004518 queue_cast(r, lkb, -EAGAIN);
4519 confirm_master(r, -EAGAIN);
David Teiglandef0c2bb2007-03-28 09:56:46 -05004520 unhold_lkb(lkb); /* undoes create_lkb() */
David Teiglande7fd4172006-01-18 09:30:29 +00004521 break;
4522
4523 case -EINPROGRESS:
4524 case 0:
4525 /* request was queued or granted on remote master */
4526 receive_flags_reply(lkb, ms);
4527 lkb->lkb_remid = ms->m_lkid;
David Teigland7d3c1fe2007-04-19 10:30:41 -05004528 if (is_altmode(lkb))
4529 munge_altmode(lkb, ms);
David Teigland3ae1acf2007-05-18 08:59:31 -05004530 if (result) {
David Teiglande7fd4172006-01-18 09:30:29 +00004531 add_lkb(r, lkb, DLM_LKSTS_WAITING);
David Teigland3ae1acf2007-05-18 08:59:31 -05004532 add_timeout(lkb);
4533 } else {
David Teiglande7fd4172006-01-18 09:30:29 +00004534 grant_lock_pc(r, lkb, ms);
4535 queue_cast(r, lkb, 0);
4536 }
David Teiglandef0c2bb2007-03-28 09:56:46 -05004537 confirm_master(r, result);
David Teiglande7fd4172006-01-18 09:30:29 +00004538 break;
4539
David Teigland597d0ca2006-07-12 16:44:04 -05004540 case -EBADR:
David Teiglande7fd4172006-01-18 09:30:29 +00004541 case -ENOTBLK:
4542 /* find_rsb failed to find rsb or rsb wasn't master */
David Teiglandc04fecb2012-05-10 10:18:07 -05004543 log_limit(ls, "receive_request_reply %x from %d %d "
4544 "master %d dir %d first %x %s", lkb->lkb_id,
4545 from_nodeid, result, r->res_master_nodeid,
4546 r->res_dir_nodeid, r->res_first_lkid, r->res_name);
4547
4548 if (r->res_dir_nodeid != dlm_our_nodeid() &&
4549 r->res_master_nodeid != dlm_our_nodeid()) {
4550 /* cause _request_lock->set_master->send_lookup */
4551 r->res_master_nodeid = 0;
4552 r->res_nodeid = -1;
4553 lkb->lkb_nodeid = -1;
4554 }
David Teiglandef0c2bb2007-03-28 09:56:46 -05004555
4556 if (is_overlap(lkb)) {
4557 /* we'll ignore error in cancel/unlock reply */
4558 queue_cast_overlap(r, lkb);
David Teiglandaec64e12008-01-08 15:37:47 -06004559 confirm_master(r, result);
David Teiglandef0c2bb2007-03-28 09:56:46 -05004560 unhold_lkb(lkb); /* undoes create_lkb() */
David Teiglandc04fecb2012-05-10 10:18:07 -05004561 } else {
David Teiglandef0c2bb2007-03-28 09:56:46 -05004562 _request_lock(r, lkb);
David Teiglandc04fecb2012-05-10 10:18:07 -05004563
4564 if (r->res_master_nodeid == dlm_our_nodeid())
4565 confirm_master(r, 0);
4566 }
David Teiglande7fd4172006-01-18 09:30:29 +00004567 break;
4568
4569 default:
David Teiglandef0c2bb2007-03-28 09:56:46 -05004570 log_error(ls, "receive_request_reply %x error %d",
4571 lkb->lkb_id, result);
David Teiglande7fd4172006-01-18 09:30:29 +00004572 }
4573
David Teiglandef0c2bb2007-03-28 09:56:46 -05004574 if (is_overlap_unlock(lkb) && (result == 0 || result == -EINPROGRESS)) {
4575 log_debug(ls, "receive_request_reply %x result %d unlock",
4576 lkb->lkb_id, result);
4577 lkb->lkb_flags &= ~DLM_IFL_OVERLAP_UNLOCK;
4578 lkb->lkb_flags &= ~DLM_IFL_OVERLAP_CANCEL;
4579 send_unlock(r, lkb);
4580 } else if (is_overlap_cancel(lkb) && (result == -EINPROGRESS)) {
4581 log_debug(ls, "receive_request_reply %x cancel", lkb->lkb_id);
4582 lkb->lkb_flags &= ~DLM_IFL_OVERLAP_UNLOCK;
4583 lkb->lkb_flags &= ~DLM_IFL_OVERLAP_CANCEL;
4584 send_cancel(r, lkb);
4585 } else {
4586 lkb->lkb_flags &= ~DLM_IFL_OVERLAP_CANCEL;
4587 lkb->lkb_flags &= ~DLM_IFL_OVERLAP_UNLOCK;
4588 }
4589 out:
David Teiglande7fd4172006-01-18 09:30:29 +00004590 unlock_rsb(r);
4591 put_rsb(r);
David Teiglandb3f58d82006-02-28 11:16:37 -05004592 dlm_put_lkb(lkb);
David Teigland6d40c4a2012-04-23 16:36:01 -05004593 return 0;
David Teiglande7fd4172006-01-18 09:30:29 +00004594}
4595
4596static void __receive_convert_reply(struct dlm_rsb *r, struct dlm_lkb *lkb,
4597 struct dlm_message *ms)
4598{
David Teiglande7fd4172006-01-18 09:30:29 +00004599 /* this is the value returned from do_convert() on the master */
David Teiglandef0c2bb2007-03-28 09:56:46 -05004600 switch (ms->m_result) {
David Teiglande7fd4172006-01-18 09:30:29 +00004601 case -EAGAIN:
4602 /* convert would block (be queued) on remote master */
4603 queue_cast(r, lkb, -EAGAIN);
4604 break;
4605
David Teiglandc85d65e2007-05-18 09:01:26 -05004606 case -EDEADLK:
4607 receive_flags_reply(lkb, ms);
4608 revert_lock_pc(r, lkb);
4609 queue_cast(r, lkb, -EDEADLK);
4610 break;
4611
David Teiglande7fd4172006-01-18 09:30:29 +00004612 case -EINPROGRESS:
4613 /* convert was queued on remote master */
David Teigland7d3c1fe2007-04-19 10:30:41 -05004614 receive_flags_reply(lkb, ms);
4615 if (is_demoted(lkb))
David Teigland2a7ce0e2011-04-04 15:19:59 -05004616 munge_demoted(lkb);
David Teiglande7fd4172006-01-18 09:30:29 +00004617 del_lkb(r, lkb);
4618 add_lkb(r, lkb, DLM_LKSTS_CONVERT);
David Teigland3ae1acf2007-05-18 08:59:31 -05004619 add_timeout(lkb);
David Teiglande7fd4172006-01-18 09:30:29 +00004620 break;
4621
4622 case 0:
4623 /* convert was granted on remote master */
4624 receive_flags_reply(lkb, ms);
David Teigland7d3c1fe2007-04-19 10:30:41 -05004625 if (is_demoted(lkb))
David Teigland2a7ce0e2011-04-04 15:19:59 -05004626 munge_demoted(lkb);
David Teiglande7fd4172006-01-18 09:30:29 +00004627 grant_lock_pc(r, lkb, ms);
4628 queue_cast(r, lkb, 0);
4629 break;
4630
4631 default:
David Teigland6d40c4a2012-04-23 16:36:01 -05004632 log_error(r->res_ls, "receive_convert_reply %x remote %d %x %d",
4633 lkb->lkb_id, ms->m_header.h_nodeid, ms->m_lkid,
4634 ms->m_result);
4635 dlm_print_rsb(r);
4636 dlm_print_lkb(lkb);
David Teiglande7fd4172006-01-18 09:30:29 +00004637 }
4638}
4639
4640static void _receive_convert_reply(struct dlm_lkb *lkb, struct dlm_message *ms)
4641{
4642 struct dlm_rsb *r = lkb->lkb_resource;
David Teiglandef0c2bb2007-03-28 09:56:46 -05004643 int error;
David Teiglande7fd4172006-01-18 09:30:29 +00004644
4645 hold_rsb(r);
4646 lock_rsb(r);
4647
David Teiglandc54e04b2008-01-09 09:59:41 -06004648 error = validate_message(lkb, ms);
4649 if (error)
4650 goto out;
4651
David Teiglandef0c2bb2007-03-28 09:56:46 -05004652 /* stub reply can happen with waiters_mutex held */
4653 error = remove_from_waiters_ms(lkb, ms);
4654 if (error)
4655 goto out;
David Teiglande7fd4172006-01-18 09:30:29 +00004656
David Teiglandef0c2bb2007-03-28 09:56:46 -05004657 __receive_convert_reply(r, lkb, ms);
4658 out:
David Teiglande7fd4172006-01-18 09:30:29 +00004659 unlock_rsb(r);
4660 put_rsb(r);
4661}
4662
David Teigland6d40c4a2012-04-23 16:36:01 -05004663static int receive_convert_reply(struct dlm_ls *ls, struct dlm_message *ms)
David Teiglande7fd4172006-01-18 09:30:29 +00004664{
4665 struct dlm_lkb *lkb;
4666 int error;
4667
4668 error = find_lkb(ls, ms->m_remid, &lkb);
David Teigland6d40c4a2012-04-23 16:36:01 -05004669 if (error)
4670 return error;
David Teiglande7fd4172006-01-18 09:30:29 +00004671
David Teiglande7fd4172006-01-18 09:30:29 +00004672 _receive_convert_reply(lkb, ms);
David Teiglandb3f58d82006-02-28 11:16:37 -05004673 dlm_put_lkb(lkb);
David Teigland6d40c4a2012-04-23 16:36:01 -05004674 return 0;
David Teiglande7fd4172006-01-18 09:30:29 +00004675}
4676
4677static void _receive_unlock_reply(struct dlm_lkb *lkb, struct dlm_message *ms)
4678{
4679 struct dlm_rsb *r = lkb->lkb_resource;
David Teiglandef0c2bb2007-03-28 09:56:46 -05004680 int error;
David Teiglande7fd4172006-01-18 09:30:29 +00004681
4682 hold_rsb(r);
4683 lock_rsb(r);
4684
David Teiglandc54e04b2008-01-09 09:59:41 -06004685 error = validate_message(lkb, ms);
4686 if (error)
4687 goto out;
4688
David Teiglandef0c2bb2007-03-28 09:56:46 -05004689 /* stub reply can happen with waiters_mutex held */
4690 error = remove_from_waiters_ms(lkb, ms);
4691 if (error)
4692 goto out;
4693
David Teiglande7fd4172006-01-18 09:30:29 +00004694 /* this is the value returned from do_unlock() on the master */
4695
David Teiglandef0c2bb2007-03-28 09:56:46 -05004696 switch (ms->m_result) {
David Teiglande7fd4172006-01-18 09:30:29 +00004697 case -DLM_EUNLOCK:
4698 receive_flags_reply(lkb, ms);
4699 remove_lock_pc(r, lkb);
4700 queue_cast(r, lkb, -DLM_EUNLOCK);
4701 break;
David Teiglandef0c2bb2007-03-28 09:56:46 -05004702 case -ENOENT:
4703 break;
David Teiglande7fd4172006-01-18 09:30:29 +00004704 default:
David Teiglandef0c2bb2007-03-28 09:56:46 -05004705 log_error(r->res_ls, "receive_unlock_reply %x error %d",
4706 lkb->lkb_id, ms->m_result);
David Teiglande7fd4172006-01-18 09:30:29 +00004707 }
David Teiglandef0c2bb2007-03-28 09:56:46 -05004708 out:
David Teiglande7fd4172006-01-18 09:30:29 +00004709 unlock_rsb(r);
4710 put_rsb(r);
4711}
4712
David Teigland6d40c4a2012-04-23 16:36:01 -05004713static int receive_unlock_reply(struct dlm_ls *ls, struct dlm_message *ms)
David Teiglande7fd4172006-01-18 09:30:29 +00004714{
4715 struct dlm_lkb *lkb;
4716 int error;
4717
4718 error = find_lkb(ls, ms->m_remid, &lkb);
David Teigland6d40c4a2012-04-23 16:36:01 -05004719 if (error)
4720 return error;
David Teiglande7fd4172006-01-18 09:30:29 +00004721
David Teiglande7fd4172006-01-18 09:30:29 +00004722 _receive_unlock_reply(lkb, ms);
David Teiglandb3f58d82006-02-28 11:16:37 -05004723 dlm_put_lkb(lkb);
David Teigland6d40c4a2012-04-23 16:36:01 -05004724 return 0;
David Teiglande7fd4172006-01-18 09:30:29 +00004725}
4726
4727static void _receive_cancel_reply(struct dlm_lkb *lkb, struct dlm_message *ms)
4728{
4729 struct dlm_rsb *r = lkb->lkb_resource;
David Teiglandef0c2bb2007-03-28 09:56:46 -05004730 int error;
David Teiglande7fd4172006-01-18 09:30:29 +00004731
4732 hold_rsb(r);
4733 lock_rsb(r);
4734
David Teiglandc54e04b2008-01-09 09:59:41 -06004735 error = validate_message(lkb, ms);
4736 if (error)
4737 goto out;
4738
David Teiglandef0c2bb2007-03-28 09:56:46 -05004739 /* stub reply can happen with waiters_mutex held */
4740 error = remove_from_waiters_ms(lkb, ms);
4741 if (error)
4742 goto out;
4743
David Teiglande7fd4172006-01-18 09:30:29 +00004744 /* this is the value returned from do_cancel() on the master */
4745
David Teiglandef0c2bb2007-03-28 09:56:46 -05004746 switch (ms->m_result) {
David Teiglande7fd4172006-01-18 09:30:29 +00004747 case -DLM_ECANCEL:
4748 receive_flags_reply(lkb, ms);
4749 revert_lock_pc(r, lkb);
David Teigland84d8cd62007-05-29 08:44:23 -05004750 queue_cast(r, lkb, -DLM_ECANCEL);
David Teiglandef0c2bb2007-03-28 09:56:46 -05004751 break;
4752 case 0:
David Teiglande7fd4172006-01-18 09:30:29 +00004753 break;
4754 default:
David Teiglandef0c2bb2007-03-28 09:56:46 -05004755 log_error(r->res_ls, "receive_cancel_reply %x error %d",
4756 lkb->lkb_id, ms->m_result);
David Teiglande7fd4172006-01-18 09:30:29 +00004757 }
David Teiglandef0c2bb2007-03-28 09:56:46 -05004758 out:
David Teiglande7fd4172006-01-18 09:30:29 +00004759 unlock_rsb(r);
4760 put_rsb(r);
4761}
4762
David Teigland6d40c4a2012-04-23 16:36:01 -05004763static int receive_cancel_reply(struct dlm_ls *ls, struct dlm_message *ms)
David Teiglande7fd4172006-01-18 09:30:29 +00004764{
4765 struct dlm_lkb *lkb;
4766 int error;
4767
4768 error = find_lkb(ls, ms->m_remid, &lkb);
David Teigland6d40c4a2012-04-23 16:36:01 -05004769 if (error)
4770 return error;
David Teiglande7fd4172006-01-18 09:30:29 +00004771
David Teiglande7fd4172006-01-18 09:30:29 +00004772 _receive_cancel_reply(lkb, ms);
David Teiglandb3f58d82006-02-28 11:16:37 -05004773 dlm_put_lkb(lkb);
David Teigland6d40c4a2012-04-23 16:36:01 -05004774 return 0;
David Teiglande7fd4172006-01-18 09:30:29 +00004775}
4776
4777static void receive_lookup_reply(struct dlm_ls *ls, struct dlm_message *ms)
4778{
4779 struct dlm_lkb *lkb;
4780 struct dlm_rsb *r;
4781 int error, ret_nodeid;
David Teiglandc04fecb2012-05-10 10:18:07 -05004782 int do_lookup_list = 0;
David Teiglande7fd4172006-01-18 09:30:29 +00004783
4784 error = find_lkb(ls, ms->m_lkid, &lkb);
4785 if (error) {
David Teigland6d40c4a2012-04-23 16:36:01 -05004786 log_error(ls, "receive_lookup_reply no lkid %x", ms->m_lkid);
David Teiglande7fd4172006-01-18 09:30:29 +00004787 return;
4788 }
4789
David Teiglandc04fecb2012-05-10 10:18:07 -05004790 /* ms->m_result is the value returned by dlm_master_lookup on dir node
David Teiglande7fd4172006-01-18 09:30:29 +00004791 FIXME: will a non-zero error ever be returned? */
David Teiglande7fd4172006-01-18 09:30:29 +00004792
4793 r = lkb->lkb_resource;
4794 hold_rsb(r);
4795 lock_rsb(r);
4796
David Teiglandef0c2bb2007-03-28 09:56:46 -05004797 error = remove_from_waiters(lkb, DLM_MSG_LOOKUP_REPLY);
4798 if (error)
4799 goto out;
4800
David Teiglande7fd4172006-01-18 09:30:29 +00004801 ret_nodeid = ms->m_nodeid;
David Teiglandc04fecb2012-05-10 10:18:07 -05004802
4803 /* We sometimes receive a request from the dir node for this
4804 rsb before we've received the dir node's loookup_reply for it.
4805 The request from the dir node implies we're the master, so we set
4806 ourself as master in receive_request_reply, and verify here that
4807 we are indeed the master. */
4808
4809 if (r->res_master_nodeid && (r->res_master_nodeid != ret_nodeid)) {
4810 /* This should never happen */
4811 log_error(ls, "receive_lookup_reply %x from %d ret %d "
4812 "master %d dir %d our %d first %x %s",
4813 lkb->lkb_id, ms->m_header.h_nodeid, ret_nodeid,
4814 r->res_master_nodeid, r->res_dir_nodeid,
4815 dlm_our_nodeid(), r->res_first_lkid, r->res_name);
4816 }
4817
David Teiglande7fd4172006-01-18 09:30:29 +00004818 if (ret_nodeid == dlm_our_nodeid()) {
David Teiglandc04fecb2012-05-10 10:18:07 -05004819 r->res_master_nodeid = ret_nodeid;
David Teiglande7fd4172006-01-18 09:30:29 +00004820 r->res_nodeid = 0;
David Teiglandc04fecb2012-05-10 10:18:07 -05004821 do_lookup_list = 1;
David Teiglande7fd4172006-01-18 09:30:29 +00004822 r->res_first_lkid = 0;
David Teiglandc04fecb2012-05-10 10:18:07 -05004823 } else if (ret_nodeid == -1) {
4824 /* the remote node doesn't believe it's the dir node */
4825 log_error(ls, "receive_lookup_reply %x from %d bad ret_nodeid",
4826 lkb->lkb_id, ms->m_header.h_nodeid);
4827 r->res_master_nodeid = 0;
4828 r->res_nodeid = -1;
4829 lkb->lkb_nodeid = -1;
David Teiglande7fd4172006-01-18 09:30:29 +00004830 } else {
David Teiglandc04fecb2012-05-10 10:18:07 -05004831 /* set_master() will set lkb_nodeid from r */
4832 r->res_master_nodeid = ret_nodeid;
David Teiglande7fd4172006-01-18 09:30:29 +00004833 r->res_nodeid = ret_nodeid;
4834 }
4835
David Teiglandef0c2bb2007-03-28 09:56:46 -05004836 if (is_overlap(lkb)) {
4837 log_debug(ls, "receive_lookup_reply %x unlock %x",
4838 lkb->lkb_id, lkb->lkb_flags);
4839 queue_cast_overlap(r, lkb);
4840 unhold_lkb(lkb); /* undoes create_lkb() */
4841 goto out_list;
4842 }
4843
David Teiglande7fd4172006-01-18 09:30:29 +00004844 _request_lock(r, lkb);
4845
David Teiglandef0c2bb2007-03-28 09:56:46 -05004846 out_list:
David Teiglandc04fecb2012-05-10 10:18:07 -05004847 if (do_lookup_list)
David Teiglande7fd4172006-01-18 09:30:29 +00004848 process_lookup_list(r);
David Teiglandef0c2bb2007-03-28 09:56:46 -05004849 out:
David Teiglande7fd4172006-01-18 09:30:29 +00004850 unlock_rsb(r);
4851 put_rsb(r);
David Teiglandb3f58d82006-02-28 11:16:37 -05004852 dlm_put_lkb(lkb);
David Teiglande7fd4172006-01-18 09:30:29 +00004853}
4854
David Teigland6d40c4a2012-04-23 16:36:01 -05004855static void _receive_message(struct dlm_ls *ls, struct dlm_message *ms,
4856 uint32_t saved_seq)
David Teiglande7fd4172006-01-18 09:30:29 +00004857{
David Teigland6d40c4a2012-04-23 16:36:01 -05004858 int error = 0, noent = 0;
4859
David Teigland46b43ee2008-01-08 16:24:00 -06004860 if (!dlm_is_member(ls, ms->m_header.h_nodeid)) {
David Teiglandc04fecb2012-05-10 10:18:07 -05004861 log_limit(ls, "receive %d from non-member %d %x %x %d",
David Teigland46b43ee2008-01-08 16:24:00 -06004862 ms->m_type, ms->m_header.h_nodeid, ms->m_lkid,
4863 ms->m_remid, ms->m_result);
4864 return;
4865 }
4866
David Teiglande7fd4172006-01-18 09:30:29 +00004867 switch (ms->m_type) {
4868
4869 /* messages sent to a master node */
4870
4871 case DLM_MSG_REQUEST:
David Teigland6d40c4a2012-04-23 16:36:01 -05004872 error = receive_request(ls, ms);
David Teiglande7fd4172006-01-18 09:30:29 +00004873 break;
4874
4875 case DLM_MSG_CONVERT:
David Teigland6d40c4a2012-04-23 16:36:01 -05004876 error = receive_convert(ls, ms);
David Teiglande7fd4172006-01-18 09:30:29 +00004877 break;
4878
4879 case DLM_MSG_UNLOCK:
David Teigland6d40c4a2012-04-23 16:36:01 -05004880 error = receive_unlock(ls, ms);
David Teiglande7fd4172006-01-18 09:30:29 +00004881 break;
4882
4883 case DLM_MSG_CANCEL:
David Teigland6d40c4a2012-04-23 16:36:01 -05004884 noent = 1;
4885 error = receive_cancel(ls, ms);
David Teiglande7fd4172006-01-18 09:30:29 +00004886 break;
4887
4888 /* messages sent from a master node (replies to above) */
4889
4890 case DLM_MSG_REQUEST_REPLY:
David Teigland6d40c4a2012-04-23 16:36:01 -05004891 error = receive_request_reply(ls, ms);
David Teiglande7fd4172006-01-18 09:30:29 +00004892 break;
4893
4894 case DLM_MSG_CONVERT_REPLY:
David Teigland6d40c4a2012-04-23 16:36:01 -05004895 error = receive_convert_reply(ls, ms);
David Teiglande7fd4172006-01-18 09:30:29 +00004896 break;
4897
4898 case DLM_MSG_UNLOCK_REPLY:
David Teigland6d40c4a2012-04-23 16:36:01 -05004899 error = receive_unlock_reply(ls, ms);
David Teiglande7fd4172006-01-18 09:30:29 +00004900 break;
4901
4902 case DLM_MSG_CANCEL_REPLY:
David Teigland6d40c4a2012-04-23 16:36:01 -05004903 error = receive_cancel_reply(ls, ms);
David Teiglande7fd4172006-01-18 09:30:29 +00004904 break;
4905
4906 /* messages sent from a master node (only two types of async msg) */
4907
4908 case DLM_MSG_GRANT:
David Teigland6d40c4a2012-04-23 16:36:01 -05004909 noent = 1;
4910 error = receive_grant(ls, ms);
David Teiglande7fd4172006-01-18 09:30:29 +00004911 break;
4912
4913 case DLM_MSG_BAST:
David Teigland6d40c4a2012-04-23 16:36:01 -05004914 noent = 1;
4915 error = receive_bast(ls, ms);
David Teiglande7fd4172006-01-18 09:30:29 +00004916 break;
4917
4918 /* messages sent to a dir node */
4919
4920 case DLM_MSG_LOOKUP:
4921 receive_lookup(ls, ms);
4922 break;
4923
4924 case DLM_MSG_REMOVE:
4925 receive_remove(ls, ms);
4926 break;
4927
4928 /* messages sent from a dir node (remove has no reply) */
4929
4930 case DLM_MSG_LOOKUP_REPLY:
4931 receive_lookup_reply(ls, ms);
4932 break;
4933
David Teigland84991372007-03-30 15:02:40 -05004934 /* other messages */
4935
4936 case DLM_MSG_PURGE:
4937 receive_purge(ls, ms);
4938 break;
4939
David Teiglande7fd4172006-01-18 09:30:29 +00004940 default:
4941 log_error(ls, "unknown message type %d", ms->m_type);
4942 }
David Teigland6d40c4a2012-04-23 16:36:01 -05004943
4944 /*
4945 * When checking for ENOENT, we're checking the result of
4946 * find_lkb(m_remid):
4947 *
4948 * The lock id referenced in the message wasn't found. This may
4949 * happen in normal usage for the async messages and cancel, so
4950 * only use log_debug for them.
4951 *
David Teigland48756472012-04-26 15:54:29 -05004952 * Some errors are expected and normal.
David Teigland6d40c4a2012-04-23 16:36:01 -05004953 */
4954
4955 if (error == -ENOENT && noent) {
David Teigland48756472012-04-26 15:54:29 -05004956 log_debug(ls, "receive %d no %x remote %d %x saved_seq %u",
David Teigland6d40c4a2012-04-23 16:36:01 -05004957 ms->m_type, ms->m_remid, ms->m_header.h_nodeid,
4958 ms->m_lkid, saved_seq);
4959 } else if (error == -ENOENT) {
David Teigland48756472012-04-26 15:54:29 -05004960 log_error(ls, "receive %d no %x remote %d %x saved_seq %u",
David Teigland6d40c4a2012-04-23 16:36:01 -05004961 ms->m_type, ms->m_remid, ms->m_header.h_nodeid,
4962 ms->m_lkid, saved_seq);
4963
4964 if (ms->m_type == DLM_MSG_CONVERT)
4965 dlm_dump_rsb_hash(ls, ms->m_hash);
4966 }
David Teigland48756472012-04-26 15:54:29 -05004967
4968 if (error == -EINVAL) {
4969 log_error(ls, "receive %d inval from %d lkid %x remid %x "
4970 "saved_seq %u",
4971 ms->m_type, ms->m_header.h_nodeid,
4972 ms->m_lkid, ms->m_remid, saved_seq);
4973 }
David Teiglande7fd4172006-01-18 09:30:29 +00004974}
4975
David Teiglandc36258b2007-09-27 15:53:38 -05004976/* If the lockspace is in recovery mode (locking stopped), then normal
4977 messages are saved on the requestqueue for processing after recovery is
4978 done. When not in recovery mode, we wait for dlm_recoverd to drain saved
4979 messages off the requestqueue before we process new ones. This occurs right
4980 after recovery completes when we transition from saving all messages on
4981 requestqueue, to processing all the saved messages, to processing new
4982 messages as they arrive. */
David Teiglande7fd4172006-01-18 09:30:29 +00004983
David Teiglandc36258b2007-09-27 15:53:38 -05004984static void dlm_receive_message(struct dlm_ls *ls, struct dlm_message *ms,
4985 int nodeid)
4986{
4987 if (dlm_locking_stopped(ls)) {
David Teiglandc04fecb2012-05-10 10:18:07 -05004988 /* If we were a member of this lockspace, left, and rejoined,
4989 other nodes may still be sending us messages from the
4990 lockspace generation before we left. */
4991 if (!ls->ls_generation) {
4992 log_limit(ls, "receive %d from %d ignore old gen",
4993 ms->m_type, nodeid);
4994 return;
4995 }
4996
Al Viro8b0d8e02008-01-25 00:28:28 -05004997 dlm_add_requestqueue(ls, nodeid, ms);
David Teiglandc36258b2007-09-27 15:53:38 -05004998 } else {
4999 dlm_wait_requestqueue(ls);
David Teigland6d40c4a2012-04-23 16:36:01 -05005000 _receive_message(ls, ms, 0);
David Teiglandc36258b2007-09-27 15:53:38 -05005001 }
5002}
5003
5004/* This is called by dlm_recoverd to process messages that were saved on
5005 the requestqueue. */
5006
David Teigland6d40c4a2012-04-23 16:36:01 -05005007void dlm_receive_message_saved(struct dlm_ls *ls, struct dlm_message *ms,
5008 uint32_t saved_seq)
David Teiglandc36258b2007-09-27 15:53:38 -05005009{
David Teigland6d40c4a2012-04-23 16:36:01 -05005010 _receive_message(ls, ms, saved_seq);
David Teiglandc36258b2007-09-27 15:53:38 -05005011}
5012
5013/* This is called by the midcomms layer when something is received for
5014 the lockspace. It could be either a MSG (normal message sent as part of
5015 standard locking activity) or an RCOM (recovery message sent as part of
5016 lockspace recovery). */
5017
Al Viroeef7d732008-01-25 00:58:46 -05005018void dlm_receive_buffer(union dlm_packet *p, int nodeid)
David Teiglandc36258b2007-09-27 15:53:38 -05005019{
Al Viroeef7d732008-01-25 00:58:46 -05005020 struct dlm_header *hd = &p->header;
David Teiglandc36258b2007-09-27 15:53:38 -05005021 struct dlm_ls *ls;
5022 int type = 0;
5023
5024 switch (hd->h_cmd) {
5025 case DLM_MSG:
Al Viroeef7d732008-01-25 00:58:46 -05005026 dlm_message_in(&p->message);
5027 type = p->message.m_type;
David Teiglandc36258b2007-09-27 15:53:38 -05005028 break;
5029 case DLM_RCOM:
Al Viroeef7d732008-01-25 00:58:46 -05005030 dlm_rcom_in(&p->rcom);
5031 type = p->rcom.rc_type;
David Teiglandc36258b2007-09-27 15:53:38 -05005032 break;
5033 default:
5034 log_print("invalid h_cmd %d from %u", hd->h_cmd, nodeid);
5035 return;
5036 }
5037
5038 if (hd->h_nodeid != nodeid) {
5039 log_print("invalid h_nodeid %d from %d lockspace %x",
5040 hd->h_nodeid, nodeid, hd->h_lockspace);
5041 return;
5042 }
5043
5044 ls = dlm_find_lockspace_global(hd->h_lockspace);
5045 if (!ls) {
David Teigland48756472012-04-26 15:54:29 -05005046 if (dlm_config.ci_log_debug) {
5047 printk_ratelimited(KERN_DEBUG "dlm: invalid lockspace "
5048 "%u from %d cmd %d type %d\n",
5049 hd->h_lockspace, nodeid, hd->h_cmd, type);
5050 }
David Teiglandc36258b2007-09-27 15:53:38 -05005051
5052 if (hd->h_cmd == DLM_RCOM && type == DLM_RCOM_STATUS)
Al Viroeef7d732008-01-25 00:58:46 -05005053 dlm_send_ls_not_ready(nodeid, &p->rcom);
David Teiglandc36258b2007-09-27 15:53:38 -05005054 return;
5055 }
5056
5057 /* this rwsem allows dlm_ls_stop() to wait for all dlm_recv threads to
5058 be inactive (in this ls) before transitioning to recovery mode */
5059
5060 down_read(&ls->ls_recv_active);
5061 if (hd->h_cmd == DLM_MSG)
Al Viroeef7d732008-01-25 00:58:46 -05005062 dlm_receive_message(ls, &p->message, nodeid);
David Teiglandc36258b2007-09-27 15:53:38 -05005063 else
Al Viroeef7d732008-01-25 00:58:46 -05005064 dlm_receive_rcom(ls, &p->rcom, nodeid);
David Teiglandc36258b2007-09-27 15:53:38 -05005065 up_read(&ls->ls_recv_active);
5066
5067 dlm_put_lockspace(ls);
5068}
David Teiglande7fd4172006-01-18 09:30:29 +00005069
David Teigland2a7ce0e2011-04-04 15:19:59 -05005070static void recover_convert_waiter(struct dlm_ls *ls, struct dlm_lkb *lkb,
5071 struct dlm_message *ms_stub)
David Teiglande7fd4172006-01-18 09:30:29 +00005072{
5073 if (middle_conversion(lkb)) {
5074 hold_lkb(lkb);
David Teigland2a7ce0e2011-04-04 15:19:59 -05005075 memset(ms_stub, 0, sizeof(struct dlm_message));
5076 ms_stub->m_flags = DLM_IFL_STUB_MS;
5077 ms_stub->m_type = DLM_MSG_CONVERT_REPLY;
5078 ms_stub->m_result = -EINPROGRESS;
5079 ms_stub->m_header.h_nodeid = lkb->lkb_nodeid;
5080 _receive_convert_reply(lkb, ms_stub);
David Teiglande7fd4172006-01-18 09:30:29 +00005081
5082 /* Same special case as in receive_rcom_lock_args() */
5083 lkb->lkb_grmode = DLM_LOCK_IV;
5084 rsb_set_flag(lkb->lkb_resource, RSB_RECOVER_CONVERT);
5085 unhold_lkb(lkb);
5086
5087 } else if (lkb->lkb_rqmode >= lkb->lkb_grmode) {
5088 lkb->lkb_flags |= DLM_IFL_RESEND;
5089 }
5090
5091 /* lkb->lkb_rqmode < lkb->lkb_grmode shouldn't happen since down
5092 conversions are async; there's no reply from the remote master */
5093}
5094
5095/* A waiting lkb needs recovery if the master node has failed, or
5096 the master node is changing (only when no directory is used) */
5097
David Teigland13ef1112012-04-23 12:18:18 -05005098static int waiter_needs_recovery(struct dlm_ls *ls, struct dlm_lkb *lkb,
5099 int dir_nodeid)
David Teiglande7fd4172006-01-18 09:30:29 +00005100{
David Teigland48756472012-04-26 15:54:29 -05005101 if (dlm_no_directory(ls))
5102 return 1;
5103
David Teigland13ef1112012-04-23 12:18:18 -05005104 if (dlm_is_removed(ls, lkb->lkb_wait_nodeid))
David Teiglande7fd4172006-01-18 09:30:29 +00005105 return 1;
5106
David Teiglande7fd4172006-01-18 09:30:29 +00005107 return 0;
5108}
5109
5110/* Recovery for locks that are waiting for replies from nodes that are now
5111 gone. We can just complete unlocks and cancels by faking a reply from the
5112 dead node. Requests and up-conversions we flag to be resent after
5113 recovery. Down-conversions can just be completed with a fake reply like
5114 unlocks. Conversions between PR and CW need special attention. */
5115
5116void dlm_recover_waiters_pre(struct dlm_ls *ls)
5117{
5118 struct dlm_lkb *lkb, *safe;
David Teigland2a7ce0e2011-04-04 15:19:59 -05005119 struct dlm_message *ms_stub;
David Teigland601342c2008-01-07 16:15:05 -06005120 int wait_type, stub_unlock_result, stub_cancel_result;
David Teigland13ef1112012-04-23 12:18:18 -05005121 int dir_nodeid;
David Teiglande7fd4172006-01-18 09:30:29 +00005122
David Teiglanda22ca482011-07-11 08:40:53 -05005123 ms_stub = kmalloc(sizeof(struct dlm_message), GFP_KERNEL);
David Teigland2a7ce0e2011-04-04 15:19:59 -05005124 if (!ms_stub) {
5125 log_error(ls, "dlm_recover_waiters_pre no mem");
5126 return;
5127 }
5128
David Teigland90135922006-01-20 08:47:07 +00005129 mutex_lock(&ls->ls_waiters_mutex);
David Teiglande7fd4172006-01-18 09:30:29 +00005130
5131 list_for_each_entry_safe(lkb, safe, &ls->ls_waiters, lkb_wait_reply) {
David Teigland2a7ce0e2011-04-04 15:19:59 -05005132
David Teigland13ef1112012-04-23 12:18:18 -05005133 dir_nodeid = dlm_dir_nodeid(lkb->lkb_resource);
5134
David Teigland2a7ce0e2011-04-04 15:19:59 -05005135 /* exclude debug messages about unlocks because there can be so
5136 many and they aren't very interesting */
5137
5138 if (lkb->lkb_wait_type != DLM_MSG_UNLOCK) {
David Teigland13ef1112012-04-23 12:18:18 -05005139 log_debug(ls, "waiter %x remote %x msg %d r_nodeid %d "
5140 "lkb_nodeid %d wait_nodeid %d dir_nodeid %d",
5141 lkb->lkb_id,
5142 lkb->lkb_remid,
5143 lkb->lkb_wait_type,
5144 lkb->lkb_resource->res_nodeid,
5145 lkb->lkb_nodeid,
5146 lkb->lkb_wait_nodeid,
5147 dir_nodeid);
David Teigland2a7ce0e2011-04-04 15:19:59 -05005148 }
David Teiglande7fd4172006-01-18 09:30:29 +00005149
5150 /* all outstanding lookups, regardless of destination will be
5151 resent after recovery is done */
5152
5153 if (lkb->lkb_wait_type == DLM_MSG_LOOKUP) {
5154 lkb->lkb_flags |= DLM_IFL_RESEND;
5155 continue;
5156 }
5157
David Teigland13ef1112012-04-23 12:18:18 -05005158 if (!waiter_needs_recovery(ls, lkb, dir_nodeid))
David Teiglande7fd4172006-01-18 09:30:29 +00005159 continue;
5160
David Teigland601342c2008-01-07 16:15:05 -06005161 wait_type = lkb->lkb_wait_type;
5162 stub_unlock_result = -DLM_EUNLOCK;
5163 stub_cancel_result = -DLM_ECANCEL;
5164
5165 /* Main reply may have been received leaving a zero wait_type,
5166 but a reply for the overlapping op may not have been
5167 received. In that case we need to fake the appropriate
5168 reply for the overlap op. */
5169
5170 if (!wait_type) {
5171 if (is_overlap_cancel(lkb)) {
5172 wait_type = DLM_MSG_CANCEL;
5173 if (lkb->lkb_grmode == DLM_LOCK_IV)
5174 stub_cancel_result = 0;
5175 }
5176 if (is_overlap_unlock(lkb)) {
5177 wait_type = DLM_MSG_UNLOCK;
5178 if (lkb->lkb_grmode == DLM_LOCK_IV)
5179 stub_unlock_result = -ENOENT;
5180 }
5181
5182 log_debug(ls, "rwpre overlap %x %x %d %d %d",
5183 lkb->lkb_id, lkb->lkb_flags, wait_type,
5184 stub_cancel_result, stub_unlock_result);
5185 }
5186
5187 switch (wait_type) {
David Teiglande7fd4172006-01-18 09:30:29 +00005188
5189 case DLM_MSG_REQUEST:
5190 lkb->lkb_flags |= DLM_IFL_RESEND;
5191 break;
5192
5193 case DLM_MSG_CONVERT:
David Teigland2a7ce0e2011-04-04 15:19:59 -05005194 recover_convert_waiter(ls, lkb, ms_stub);
David Teiglande7fd4172006-01-18 09:30:29 +00005195 break;
5196
5197 case DLM_MSG_UNLOCK:
5198 hold_lkb(lkb);
David Teigland2a7ce0e2011-04-04 15:19:59 -05005199 memset(ms_stub, 0, sizeof(struct dlm_message));
5200 ms_stub->m_flags = DLM_IFL_STUB_MS;
5201 ms_stub->m_type = DLM_MSG_UNLOCK_REPLY;
5202 ms_stub->m_result = stub_unlock_result;
5203 ms_stub->m_header.h_nodeid = lkb->lkb_nodeid;
5204 _receive_unlock_reply(lkb, ms_stub);
David Teiglandb3f58d82006-02-28 11:16:37 -05005205 dlm_put_lkb(lkb);
David Teiglande7fd4172006-01-18 09:30:29 +00005206 break;
5207
5208 case DLM_MSG_CANCEL:
5209 hold_lkb(lkb);
David Teigland2a7ce0e2011-04-04 15:19:59 -05005210 memset(ms_stub, 0, sizeof(struct dlm_message));
5211 ms_stub->m_flags = DLM_IFL_STUB_MS;
5212 ms_stub->m_type = DLM_MSG_CANCEL_REPLY;
5213 ms_stub->m_result = stub_cancel_result;
5214 ms_stub->m_header.h_nodeid = lkb->lkb_nodeid;
5215 _receive_cancel_reply(lkb, ms_stub);
David Teiglandb3f58d82006-02-28 11:16:37 -05005216 dlm_put_lkb(lkb);
David Teiglande7fd4172006-01-18 09:30:29 +00005217 break;
5218
5219 default:
David Teigland601342c2008-01-07 16:15:05 -06005220 log_error(ls, "invalid lkb wait_type %d %d",
5221 lkb->lkb_wait_type, wait_type);
David Teiglande7fd4172006-01-18 09:30:29 +00005222 }
David Teigland81456802006-07-25 14:05:09 -05005223 schedule();
David Teiglande7fd4172006-01-18 09:30:29 +00005224 }
David Teigland90135922006-01-20 08:47:07 +00005225 mutex_unlock(&ls->ls_waiters_mutex);
David Teigland2a7ce0e2011-04-04 15:19:59 -05005226 kfree(ms_stub);
David Teiglande7fd4172006-01-18 09:30:29 +00005227}
5228
David Teiglandef0c2bb2007-03-28 09:56:46 -05005229static struct dlm_lkb *find_resend_waiter(struct dlm_ls *ls)
David Teiglande7fd4172006-01-18 09:30:29 +00005230{
5231 struct dlm_lkb *lkb;
David Teiglandef0c2bb2007-03-28 09:56:46 -05005232 int found = 0;
David Teiglande7fd4172006-01-18 09:30:29 +00005233
David Teigland90135922006-01-20 08:47:07 +00005234 mutex_lock(&ls->ls_waiters_mutex);
David Teiglande7fd4172006-01-18 09:30:29 +00005235 list_for_each_entry(lkb, &ls->ls_waiters, lkb_wait_reply) {
5236 if (lkb->lkb_flags & DLM_IFL_RESEND) {
David Teiglandef0c2bb2007-03-28 09:56:46 -05005237 hold_lkb(lkb);
5238 found = 1;
David Teiglande7fd4172006-01-18 09:30:29 +00005239 break;
5240 }
5241 }
David Teigland90135922006-01-20 08:47:07 +00005242 mutex_unlock(&ls->ls_waiters_mutex);
David Teiglande7fd4172006-01-18 09:30:29 +00005243
David Teiglandef0c2bb2007-03-28 09:56:46 -05005244 if (!found)
David Teiglande7fd4172006-01-18 09:30:29 +00005245 lkb = NULL;
David Teiglandef0c2bb2007-03-28 09:56:46 -05005246 return lkb;
David Teiglande7fd4172006-01-18 09:30:29 +00005247}
5248
5249/* Deal with lookups and lkb's marked RESEND from _pre. We may now be the
5250 master or dir-node for r. Processing the lkb may result in it being placed
5251 back on waiters. */
5252
David Teiglandef0c2bb2007-03-28 09:56:46 -05005253/* We do this after normal locking has been enabled and any saved messages
5254 (in requestqueue) have been processed. We should be confident that at
5255 this point we won't get or process a reply to any of these waiting
5256 operations. But, new ops may be coming in on the rsbs/locks here from
5257 userspace or remotely. */
5258
5259/* there may have been an overlap unlock/cancel prior to recovery or after
5260 recovery. if before, the lkb may still have a pos wait_count; if after, the
5261 overlap flag would just have been set and nothing new sent. we can be
5262 confident here than any replies to either the initial op or overlap ops
5263 prior to recovery have been received. */
5264
David Teiglande7fd4172006-01-18 09:30:29 +00005265int dlm_recover_waiters_post(struct dlm_ls *ls)
5266{
5267 struct dlm_lkb *lkb;
5268 struct dlm_rsb *r;
David Teiglandef0c2bb2007-03-28 09:56:46 -05005269 int error = 0, mstype, err, oc, ou;
David Teiglande7fd4172006-01-18 09:30:29 +00005270
5271 while (1) {
5272 if (dlm_locking_stopped(ls)) {
5273 log_debug(ls, "recover_waiters_post aborted");
5274 error = -EINTR;
5275 break;
5276 }
5277
David Teiglandef0c2bb2007-03-28 09:56:46 -05005278 lkb = find_resend_waiter(ls);
5279 if (!lkb)
David Teiglande7fd4172006-01-18 09:30:29 +00005280 break;
5281
5282 r = lkb->lkb_resource;
David Teiglandef0c2bb2007-03-28 09:56:46 -05005283 hold_rsb(r);
5284 lock_rsb(r);
5285
5286 mstype = lkb->lkb_wait_type;
5287 oc = is_overlap_cancel(lkb);
5288 ou = is_overlap_unlock(lkb);
5289 err = 0;
David Teiglande7fd4172006-01-18 09:30:29 +00005290
David Teigland13ef1112012-04-23 12:18:18 -05005291 log_debug(ls, "waiter %x remote %x msg %d r_nodeid %d "
5292 "lkb_nodeid %d wait_nodeid %d dir_nodeid %d "
5293 "overlap %d %d", lkb->lkb_id, lkb->lkb_remid, mstype,
5294 r->res_nodeid, lkb->lkb_nodeid, lkb->lkb_wait_nodeid,
5295 dlm_dir_nodeid(r), oc, ou);
David Teiglande7fd4172006-01-18 09:30:29 +00005296
David Teiglandef0c2bb2007-03-28 09:56:46 -05005297 /* At this point we assume that we won't get a reply to any
5298 previous op or overlap op on this lock. First, do a big
5299 remove_from_waiters() for all previous ops. */
David Teiglande7fd4172006-01-18 09:30:29 +00005300
David Teiglandef0c2bb2007-03-28 09:56:46 -05005301 lkb->lkb_flags &= ~DLM_IFL_RESEND;
5302 lkb->lkb_flags &= ~DLM_IFL_OVERLAP_UNLOCK;
5303 lkb->lkb_flags &= ~DLM_IFL_OVERLAP_CANCEL;
5304 lkb->lkb_wait_type = 0;
5305 lkb->lkb_wait_count = 0;
5306 mutex_lock(&ls->ls_waiters_mutex);
5307 list_del_init(&lkb->lkb_wait_reply);
5308 mutex_unlock(&ls->ls_waiters_mutex);
5309 unhold_lkb(lkb); /* for waiters list */
David Teiglande7fd4172006-01-18 09:30:29 +00005310
David Teiglandef0c2bb2007-03-28 09:56:46 -05005311 if (oc || ou) {
5312 /* do an unlock or cancel instead of resending */
5313 switch (mstype) {
5314 case DLM_MSG_LOOKUP:
5315 case DLM_MSG_REQUEST:
5316 queue_cast(r, lkb, ou ? -DLM_EUNLOCK :
5317 -DLM_ECANCEL);
5318 unhold_lkb(lkb); /* undoes create_lkb() */
5319 break;
5320 case DLM_MSG_CONVERT:
5321 if (oc) {
5322 queue_cast(r, lkb, -DLM_ECANCEL);
5323 } else {
5324 lkb->lkb_exflags |= DLM_LKF_FORCEUNLOCK;
5325 _unlock_lock(r, lkb);
5326 }
5327 break;
5328 default:
5329 err = 1;
5330 }
5331 } else {
5332 switch (mstype) {
5333 case DLM_MSG_LOOKUP:
5334 case DLM_MSG_REQUEST:
5335 _request_lock(r, lkb);
5336 if (is_master(r))
5337 confirm_master(r, 0);
5338 break;
5339 case DLM_MSG_CONVERT:
5340 _convert_lock(r, lkb);
5341 break;
5342 default:
5343 err = 1;
5344 }
David Teiglande7fd4172006-01-18 09:30:29 +00005345 }
David Teiglandef0c2bb2007-03-28 09:56:46 -05005346
David Teigland13ef1112012-04-23 12:18:18 -05005347 if (err) {
5348 log_error(ls, "waiter %x msg %d r_nodeid %d "
5349 "dir_nodeid %d overlap %d %d",
5350 lkb->lkb_id, mstype, r->res_nodeid,
5351 dlm_dir_nodeid(r), oc, ou);
5352 }
David Teiglandef0c2bb2007-03-28 09:56:46 -05005353 unlock_rsb(r);
5354 put_rsb(r);
5355 dlm_put_lkb(lkb);
David Teiglande7fd4172006-01-18 09:30:29 +00005356 }
5357
5358 return error;
5359}
5360
David Teigland48756472012-04-26 15:54:29 -05005361static void purge_mstcpy_list(struct dlm_ls *ls, struct dlm_rsb *r,
5362 struct list_head *list)
David Teiglande7fd4172006-01-18 09:30:29 +00005363{
David Teiglande7fd4172006-01-18 09:30:29 +00005364 struct dlm_lkb *lkb, *safe;
5365
David Teigland48756472012-04-26 15:54:29 -05005366 list_for_each_entry_safe(lkb, safe, list, lkb_statequeue) {
5367 if (!is_master_copy(lkb))
5368 continue;
5369
5370 /* don't purge lkbs we've added in recover_master_copy for
5371 the current recovery seq */
5372
5373 if (lkb->lkb_recover_seq == ls->ls_recover_seq)
5374 continue;
5375
5376 del_lkb(r, lkb);
5377
5378 /* this put should free the lkb */
5379 if (!dlm_put_lkb(lkb))
5380 log_error(ls, "purged mstcpy lkb not released");
David Teiglande7fd4172006-01-18 09:30:29 +00005381 }
5382}
5383
David Teiglande7fd4172006-01-18 09:30:29 +00005384void dlm_purge_mstcpy_locks(struct dlm_rsb *r)
5385{
David Teigland48756472012-04-26 15:54:29 -05005386 struct dlm_ls *ls = r->res_ls;
5387
5388 purge_mstcpy_list(ls, r, &r->res_grantqueue);
5389 purge_mstcpy_list(ls, r, &r->res_convertqueue);
5390 purge_mstcpy_list(ls, r, &r->res_waitqueue);
5391}
5392
5393static void purge_dead_list(struct dlm_ls *ls, struct dlm_rsb *r,
5394 struct list_head *list,
5395 int nodeid_gone, unsigned int *count)
5396{
5397 struct dlm_lkb *lkb, *safe;
5398
5399 list_for_each_entry_safe(lkb, safe, list, lkb_statequeue) {
5400 if (!is_master_copy(lkb))
5401 continue;
5402
5403 if ((lkb->lkb_nodeid == nodeid_gone) ||
5404 dlm_is_removed(ls, lkb->lkb_nodeid)) {
5405
David Teiglandda8c6662012-11-15 15:01:51 -06005406 /* tell recover_lvb to invalidate the lvb
5407 because a node holding EX/PW failed */
5408 if ((lkb->lkb_exflags & DLM_LKF_VALBLK) &&
5409 (lkb->lkb_grmode >= DLM_LOCK_PW)) {
5410 rsb_set_flag(r, RSB_RECOVER_LVB_INVAL);
5411 }
5412
David Teigland48756472012-04-26 15:54:29 -05005413 del_lkb(r, lkb);
5414
5415 /* this put should free the lkb */
5416 if (!dlm_put_lkb(lkb))
5417 log_error(ls, "purged dead lkb not released");
5418
5419 rsb_set_flag(r, RSB_RECOVER_GRANT);
5420
5421 (*count)++;
5422 }
5423 }
David Teiglande7fd4172006-01-18 09:30:29 +00005424}
5425
5426/* Get rid of locks held by nodes that are gone. */
5427
David Teigland48756472012-04-26 15:54:29 -05005428void dlm_recover_purge(struct dlm_ls *ls)
David Teiglande7fd4172006-01-18 09:30:29 +00005429{
5430 struct dlm_rsb *r;
David Teigland48756472012-04-26 15:54:29 -05005431 struct dlm_member *memb;
5432 int nodes_count = 0;
5433 int nodeid_gone = 0;
5434 unsigned int lkb_count = 0;
David Teiglande7fd4172006-01-18 09:30:29 +00005435
David Teigland48756472012-04-26 15:54:29 -05005436 /* cache one removed nodeid to optimize the common
5437 case of a single node removed */
5438
5439 list_for_each_entry(memb, &ls->ls_nodes_gone, list) {
5440 nodes_count++;
5441 nodeid_gone = memb->nodeid;
5442 }
5443
5444 if (!nodes_count)
5445 return;
David Teiglande7fd4172006-01-18 09:30:29 +00005446
5447 down_write(&ls->ls_root_sem);
5448 list_for_each_entry(r, &ls->ls_root_list, res_root_list) {
5449 hold_rsb(r);
5450 lock_rsb(r);
David Teigland48756472012-04-26 15:54:29 -05005451 if (is_master(r)) {
5452 purge_dead_list(ls, r, &r->res_grantqueue,
5453 nodeid_gone, &lkb_count);
5454 purge_dead_list(ls, r, &r->res_convertqueue,
5455 nodeid_gone, &lkb_count);
5456 purge_dead_list(ls, r, &r->res_waitqueue,
5457 nodeid_gone, &lkb_count);
5458 }
David Teiglande7fd4172006-01-18 09:30:29 +00005459 unlock_rsb(r);
5460 unhold_rsb(r);
David Teigland48756472012-04-26 15:54:29 -05005461 cond_resched();
David Teiglande7fd4172006-01-18 09:30:29 +00005462 }
5463 up_write(&ls->ls_root_sem);
5464
David Teigland48756472012-04-26 15:54:29 -05005465 if (lkb_count)
David Teigland075f0172014-02-14 11:54:44 -06005466 log_rinfo(ls, "dlm_recover_purge %u locks for %u nodes",
David Teigland48756472012-04-26 15:54:29 -05005467 lkb_count, nodes_count);
David Teiglande7fd4172006-01-18 09:30:29 +00005468}
5469
David Teigland48756472012-04-26 15:54:29 -05005470static struct dlm_rsb *find_grant_rsb(struct dlm_ls *ls, int bucket)
David Teigland97a35d12006-05-02 13:34:03 -04005471{
Bob Peterson9beb3bf2011-10-26 15:24:55 -05005472 struct rb_node *n;
David Teigland48756472012-04-26 15:54:29 -05005473 struct dlm_rsb *r;
David Teigland97a35d12006-05-02 13:34:03 -04005474
David Teiglandc7be7612009-01-07 16:50:41 -06005475 spin_lock(&ls->ls_rsbtbl[bucket].lock);
Bob Peterson9beb3bf2011-10-26 15:24:55 -05005476 for (n = rb_first(&ls->ls_rsbtbl[bucket].keep); n; n = rb_next(n)) {
5477 r = rb_entry(n, struct dlm_rsb, res_hashnode);
David Teigland48756472012-04-26 15:54:29 -05005478
5479 if (!rsb_flag(r, RSB_RECOVER_GRANT))
5480 continue;
David Teiglandc503a622012-06-05 15:55:19 -05005481 if (!is_master(r)) {
5482 rsb_clear_flag(r, RSB_RECOVER_GRANT);
David Teigland97a35d12006-05-02 13:34:03 -04005483 continue;
David Teiglandc503a622012-06-05 15:55:19 -05005484 }
David Teigland97a35d12006-05-02 13:34:03 -04005485 hold_rsb(r);
David Teigland48756472012-04-26 15:54:29 -05005486 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
5487 return r;
David Teigland97a35d12006-05-02 13:34:03 -04005488 }
David Teiglandc7be7612009-01-07 16:50:41 -06005489 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
David Teigland48756472012-04-26 15:54:29 -05005490 return NULL;
David Teigland97a35d12006-05-02 13:34:03 -04005491}
5492
David Teigland48756472012-04-26 15:54:29 -05005493/*
5494 * Attempt to grant locks on resources that we are the master of.
5495 * Locks may have become grantable during recovery because locks
5496 * from departed nodes have been purged (or not rebuilt), allowing
5497 * previously blocked locks to now be granted. The subset of rsb's
5498 * we are interested in are those with lkb's on either the convert or
5499 * waiting queues.
5500 *
5501 * Simplest would be to go through each master rsb and check for non-empty
5502 * convert or waiting queues, and attempt to grant on those rsbs.
5503 * Checking the queues requires lock_rsb, though, for which we'd need
5504 * to release the rsbtbl lock. This would make iterating through all
5505 * rsb's very inefficient. So, we rely on earlier recovery routines
5506 * to set RECOVER_GRANT on any rsb's that we should attempt to grant
5507 * locks for.
5508 */
5509
5510void dlm_recover_grant(struct dlm_ls *ls)
David Teiglande7fd4172006-01-18 09:30:29 +00005511{
5512 struct dlm_rsb *r;
David Teigland2b4e9262006-07-25 13:59:48 -05005513 int bucket = 0;
David Teigland48756472012-04-26 15:54:29 -05005514 unsigned int count = 0;
5515 unsigned int rsb_count = 0;
5516 unsigned int lkb_count = 0;
David Teiglande7fd4172006-01-18 09:30:29 +00005517
David Teigland2b4e9262006-07-25 13:59:48 -05005518 while (1) {
David Teigland48756472012-04-26 15:54:29 -05005519 r = find_grant_rsb(ls, bucket);
David Teigland2b4e9262006-07-25 13:59:48 -05005520 if (!r) {
5521 if (bucket == ls->ls_rsbtbl_size - 1)
5522 break;
5523 bucket++;
David Teigland97a35d12006-05-02 13:34:03 -04005524 continue;
David Teigland2b4e9262006-07-25 13:59:48 -05005525 }
David Teigland48756472012-04-26 15:54:29 -05005526 rsb_count++;
5527 count = 0;
David Teigland97a35d12006-05-02 13:34:03 -04005528 lock_rsb(r);
David Teiglandc503a622012-06-05 15:55:19 -05005529 /* the RECOVER_GRANT flag is checked in the grant path */
David Teigland48756472012-04-26 15:54:29 -05005530 grant_pending_locks(r, &count);
David Teiglandc503a622012-06-05 15:55:19 -05005531 rsb_clear_flag(r, RSB_RECOVER_GRANT);
David Teigland48756472012-04-26 15:54:29 -05005532 lkb_count += count;
5533 confirm_master(r, 0);
David Teigland97a35d12006-05-02 13:34:03 -04005534 unlock_rsb(r);
5535 put_rsb(r);
David Teigland48756472012-04-26 15:54:29 -05005536 cond_resched();
David Teiglande7fd4172006-01-18 09:30:29 +00005537 }
David Teigland48756472012-04-26 15:54:29 -05005538
5539 if (lkb_count)
David Teigland075f0172014-02-14 11:54:44 -06005540 log_rinfo(ls, "dlm_recover_grant %u locks on %u resources",
David Teigland48756472012-04-26 15:54:29 -05005541 lkb_count, rsb_count);
David Teiglande7fd4172006-01-18 09:30:29 +00005542}
5543
5544static struct dlm_lkb *search_remid_list(struct list_head *head, int nodeid,
5545 uint32_t remid)
5546{
5547 struct dlm_lkb *lkb;
5548
5549 list_for_each_entry(lkb, head, lkb_statequeue) {
5550 if (lkb->lkb_nodeid == nodeid && lkb->lkb_remid == remid)
5551 return lkb;
5552 }
5553 return NULL;
5554}
5555
5556static struct dlm_lkb *search_remid(struct dlm_rsb *r, int nodeid,
5557 uint32_t remid)
5558{
5559 struct dlm_lkb *lkb;
5560
5561 lkb = search_remid_list(&r->res_grantqueue, nodeid, remid);
5562 if (lkb)
5563 return lkb;
5564 lkb = search_remid_list(&r->res_convertqueue, nodeid, remid);
5565 if (lkb)
5566 return lkb;
5567 lkb = search_remid_list(&r->res_waitqueue, nodeid, remid);
5568 if (lkb)
5569 return lkb;
5570 return NULL;
5571}
5572
Al Viroae773d02008-01-25 19:55:09 -05005573/* needs at least dlm_rcom + rcom_lock */
David Teiglande7fd4172006-01-18 09:30:29 +00005574static int receive_rcom_lock_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
5575 struct dlm_rsb *r, struct dlm_rcom *rc)
5576{
5577 struct rcom_lock *rl = (struct rcom_lock *) rc->rc_buf;
David Teiglande7fd4172006-01-18 09:30:29 +00005578
5579 lkb->lkb_nodeid = rc->rc_header.h_nodeid;
Al Viro163a1852008-01-25 02:08:26 -05005580 lkb->lkb_ownpid = le32_to_cpu(rl->rl_ownpid);
5581 lkb->lkb_remid = le32_to_cpu(rl->rl_lkid);
5582 lkb->lkb_exflags = le32_to_cpu(rl->rl_exflags);
5583 lkb->lkb_flags = le32_to_cpu(rl->rl_flags) & 0x0000FFFF;
David Teiglande7fd4172006-01-18 09:30:29 +00005584 lkb->lkb_flags |= DLM_IFL_MSTCPY;
Al Viro163a1852008-01-25 02:08:26 -05005585 lkb->lkb_lvbseq = le32_to_cpu(rl->rl_lvbseq);
David Teiglande7fd4172006-01-18 09:30:29 +00005586 lkb->lkb_rqmode = rl->rl_rqmode;
5587 lkb->lkb_grmode = rl->rl_grmode;
5588 /* don't set lkb_status because add_lkb wants to itself */
5589
David Teigland8304d6f2011-02-21 14:58:21 -06005590 lkb->lkb_bastfn = (rl->rl_asts & DLM_CB_BAST) ? &fake_bastfn : NULL;
5591 lkb->lkb_astfn = (rl->rl_asts & DLM_CB_CAST) ? &fake_astfn : NULL;
David Teiglande7fd4172006-01-18 09:30:29 +00005592
David Teiglande7fd4172006-01-18 09:30:29 +00005593 if (lkb->lkb_exflags & DLM_LKF_VALBLK) {
Al Viroa5dd0632008-01-25 20:22:22 -05005594 int lvblen = rc->rc_header.h_length - sizeof(struct dlm_rcom) -
5595 sizeof(struct rcom_lock);
5596 if (lvblen > ls->ls_lvblen)
5597 return -EINVAL;
David Teigland52bda2b2007-11-07 09:06:49 -06005598 lkb->lkb_lvbptr = dlm_allocate_lvb(ls);
David Teiglande7fd4172006-01-18 09:30:29 +00005599 if (!lkb->lkb_lvbptr)
5600 return -ENOMEM;
David Teiglande7fd4172006-01-18 09:30:29 +00005601 memcpy(lkb->lkb_lvbptr, rl->rl_lvb, lvblen);
5602 }
5603
5604 /* Conversions between PR and CW (middle modes) need special handling.
5605 The real granted mode of these converting locks cannot be determined
5606 until all locks have been rebuilt on the rsb (recover_conversion) */
5607
Al Viro163a1852008-01-25 02:08:26 -05005608 if (rl->rl_wait_type == cpu_to_le16(DLM_MSG_CONVERT) &&
5609 middle_conversion(lkb)) {
David Teiglande7fd4172006-01-18 09:30:29 +00005610 rl->rl_status = DLM_LKSTS_CONVERT;
5611 lkb->lkb_grmode = DLM_LOCK_IV;
5612 rsb_set_flag(r, RSB_RECOVER_CONVERT);
5613 }
5614
5615 return 0;
5616}
5617
5618/* This lkb may have been recovered in a previous aborted recovery so we need
5619 to check if the rsb already has an lkb with the given remote nodeid/lkid.
5620 If so we just send back a standard reply. If not, we create a new lkb with
5621 the given values and send back our lkid. We send back our lkid by sending
5622 back the rcom_lock struct we got but with the remid field filled in. */
5623
Al Viroae773d02008-01-25 19:55:09 -05005624/* needs at least dlm_rcom + rcom_lock */
David Teiglande7fd4172006-01-18 09:30:29 +00005625int dlm_recover_master_copy(struct dlm_ls *ls, struct dlm_rcom *rc)
5626{
5627 struct rcom_lock *rl = (struct rcom_lock *) rc->rc_buf;
5628 struct dlm_rsb *r;
5629 struct dlm_lkb *lkb;
David Teigland6d40c4a2012-04-23 16:36:01 -05005630 uint32_t remid = 0;
David Teiglandc04fecb2012-05-10 10:18:07 -05005631 int from_nodeid = rc->rc_header.h_nodeid;
David Teiglande7fd4172006-01-18 09:30:29 +00005632 int error;
5633
5634 if (rl->rl_parent_lkid) {
5635 error = -EOPNOTSUPP;
5636 goto out;
5637 }
5638
David Teigland6d40c4a2012-04-23 16:36:01 -05005639 remid = le32_to_cpu(rl->rl_lkid);
5640
David Teigland48756472012-04-26 15:54:29 -05005641 /* In general we expect the rsb returned to be R_MASTER, but we don't
5642 have to require it. Recovery of masters on one node can overlap
5643 recovery of locks on another node, so one node can send us MSTCPY
5644 locks before we've made ourselves master of this rsb. We can still
5645 add new MSTCPY locks that we receive here without any harm; when
5646 we make ourselves master, dlm_recover_masters() won't touch the
5647 MSTCPY locks we've received early. */
5648
David Teiglandc04fecb2012-05-10 10:18:07 -05005649 error = find_rsb(ls, rl->rl_name, le16_to_cpu(rl->rl_namelen),
5650 from_nodeid, R_RECEIVE_RECOVER, &r);
David Teiglande7fd4172006-01-18 09:30:29 +00005651 if (error)
5652 goto out;
5653
5654 lock_rsb(r);
5655
David Teiglandc04fecb2012-05-10 10:18:07 -05005656 if (dlm_no_directory(ls) && (dlm_dir_nodeid(r) != dlm_our_nodeid())) {
5657 log_error(ls, "dlm_recover_master_copy remote %d %x not dir",
5658 from_nodeid, remid);
5659 error = -EBADR;
5660 goto out_unlock;
5661 }
5662
5663 lkb = search_remid(r, from_nodeid, remid);
David Teiglande7fd4172006-01-18 09:30:29 +00005664 if (lkb) {
5665 error = -EEXIST;
5666 goto out_remid;
5667 }
5668
5669 error = create_lkb(ls, &lkb);
5670 if (error)
5671 goto out_unlock;
5672
5673 error = receive_rcom_lock_args(ls, lkb, r, rc);
5674 if (error) {
David Teiglandb3f58d82006-02-28 11:16:37 -05005675 __put_lkb(ls, lkb);
David Teiglande7fd4172006-01-18 09:30:29 +00005676 goto out_unlock;
5677 }
5678
5679 attach_lkb(r, lkb);
5680 add_lkb(r, lkb, rl->rl_status);
5681 error = 0;
David Teigland48756472012-04-26 15:54:29 -05005682 ls->ls_recover_locks_in++;
5683
5684 if (!list_empty(&r->res_waitqueue) || !list_empty(&r->res_convertqueue))
5685 rsb_set_flag(r, RSB_RECOVER_GRANT);
David Teiglande7fd4172006-01-18 09:30:29 +00005686
5687 out_remid:
5688 /* this is the new value returned to the lock holder for
5689 saving in its process-copy lkb */
Al Viro163a1852008-01-25 02:08:26 -05005690 rl->rl_remid = cpu_to_le32(lkb->lkb_id);
David Teiglande7fd4172006-01-18 09:30:29 +00005691
David Teigland48756472012-04-26 15:54:29 -05005692 lkb->lkb_recover_seq = ls->ls_recover_seq;
5693
David Teiglande7fd4172006-01-18 09:30:29 +00005694 out_unlock:
5695 unlock_rsb(r);
5696 put_rsb(r);
5697 out:
David Teigland6d40c4a2012-04-23 16:36:01 -05005698 if (error && error != -EEXIST)
David Teigland075f0172014-02-14 11:54:44 -06005699 log_rinfo(ls, "dlm_recover_master_copy remote %d %x error %d",
David Teiglandc04fecb2012-05-10 10:18:07 -05005700 from_nodeid, remid, error);
Al Viro163a1852008-01-25 02:08:26 -05005701 rl->rl_result = cpu_to_le32(error);
David Teiglande7fd4172006-01-18 09:30:29 +00005702 return error;
5703}
5704
Al Viroae773d02008-01-25 19:55:09 -05005705/* needs at least dlm_rcom + rcom_lock */
David Teiglande7fd4172006-01-18 09:30:29 +00005706int dlm_recover_process_copy(struct dlm_ls *ls, struct dlm_rcom *rc)
5707{
5708 struct rcom_lock *rl = (struct rcom_lock *) rc->rc_buf;
5709 struct dlm_rsb *r;
5710 struct dlm_lkb *lkb;
David Teigland6d40c4a2012-04-23 16:36:01 -05005711 uint32_t lkid, remid;
5712 int error, result;
David Teiglande7fd4172006-01-18 09:30:29 +00005713
David Teigland6d40c4a2012-04-23 16:36:01 -05005714 lkid = le32_to_cpu(rl->rl_lkid);
5715 remid = le32_to_cpu(rl->rl_remid);
5716 result = le32_to_cpu(rl->rl_result);
5717
5718 error = find_lkb(ls, lkid, &lkb);
David Teiglande7fd4172006-01-18 09:30:29 +00005719 if (error) {
David Teigland6d40c4a2012-04-23 16:36:01 -05005720 log_error(ls, "dlm_recover_process_copy no %x remote %d %x %d",
5721 lkid, rc->rc_header.h_nodeid, remid, result);
David Teiglande7fd4172006-01-18 09:30:29 +00005722 return error;
5723 }
5724
David Teiglande7fd4172006-01-18 09:30:29 +00005725 r = lkb->lkb_resource;
5726 hold_rsb(r);
5727 lock_rsb(r);
5728
David Teigland48756472012-04-26 15:54:29 -05005729 if (!is_process_copy(lkb)) {
5730 log_error(ls, "dlm_recover_process_copy bad %x remote %d %x %d",
5731 lkid, rc->rc_header.h_nodeid, remid, result);
5732 dlm_dump_rsb(r);
5733 unlock_rsb(r);
5734 put_rsb(r);
5735 dlm_put_lkb(lkb);
5736 return -EINVAL;
5737 }
5738
David Teigland6d40c4a2012-04-23 16:36:01 -05005739 switch (result) {
David Teiglanddc200a82006-12-13 10:36:37 -06005740 case -EBADR:
5741 /* There's a chance the new master received our lock before
5742 dlm_recover_master_reply(), this wouldn't happen if we did
5743 a barrier between recover_masters and recover_locks. */
David Teigland6d40c4a2012-04-23 16:36:01 -05005744
5745 log_debug(ls, "dlm_recover_process_copy %x remote %d %x %d",
5746 lkid, rc->rc_header.h_nodeid, remid, result);
5747
David Teiglanddc200a82006-12-13 10:36:37 -06005748 dlm_send_rcom_lock(r, lkb);
5749 goto out;
David Teiglande7fd4172006-01-18 09:30:29 +00005750 case -EEXIST:
David Teiglande7fd4172006-01-18 09:30:29 +00005751 case 0:
David Teigland6d40c4a2012-04-23 16:36:01 -05005752 lkb->lkb_remid = remid;
David Teiglande7fd4172006-01-18 09:30:29 +00005753 break;
5754 default:
David Teigland6d40c4a2012-04-23 16:36:01 -05005755 log_error(ls, "dlm_recover_process_copy %x remote %d %x %d unk",
5756 lkid, rc->rc_header.h_nodeid, remid, result);
David Teiglande7fd4172006-01-18 09:30:29 +00005757 }
5758
5759 /* an ack for dlm_recover_locks() which waits for replies from
5760 all the locks it sends to new masters */
5761 dlm_recovered_lock(r);
David Teiglanddc200a82006-12-13 10:36:37 -06005762 out:
David Teiglande7fd4172006-01-18 09:30:29 +00005763 unlock_rsb(r);
5764 put_rsb(r);
David Teiglandb3f58d82006-02-28 11:16:37 -05005765 dlm_put_lkb(lkb);
David Teiglande7fd4172006-01-18 09:30:29 +00005766
5767 return 0;
5768}
5769
David Teigland597d0ca2006-07-12 16:44:04 -05005770int dlm_user_request(struct dlm_ls *ls, struct dlm_user_args *ua,
5771 int mode, uint32_t flags, void *name, unsigned int namelen,
David Teiglandd7db9232007-05-18 09:00:32 -05005772 unsigned long timeout_cs)
David Teigland597d0ca2006-07-12 16:44:04 -05005773{
5774 struct dlm_lkb *lkb;
5775 struct dlm_args args;
5776 int error;
5777
David Teigland85e86ed2007-05-18 08:58:15 -05005778 dlm_lock_recovery(ls);
David Teigland597d0ca2006-07-12 16:44:04 -05005779
5780 error = create_lkb(ls, &lkb);
5781 if (error) {
5782 kfree(ua);
5783 goto out;
5784 }
5785
5786 if (flags & DLM_LKF_VALBLK) {
David Teigland573c24c2009-11-30 16:34:43 -06005787 ua->lksb.sb_lvbptr = kzalloc(DLM_USER_LVB_LEN, GFP_NOFS);
David Teigland597d0ca2006-07-12 16:44:04 -05005788 if (!ua->lksb.sb_lvbptr) {
5789 kfree(ua);
5790 __put_lkb(ls, lkb);
5791 error = -ENOMEM;
5792 goto out;
5793 }
5794 }
5795
David Teigland52bda2b2007-11-07 09:06:49 -06005796 /* After ua is attached to lkb it will be freed by dlm_free_lkb().
David Teigland597d0ca2006-07-12 16:44:04 -05005797 When DLM_IFL_USER is set, the dlm knows that this is a userspace
5798 lock and that lkb_astparam is the dlm_user_args structure. */
5799
David Teiglandd7db9232007-05-18 09:00:32 -05005800 error = set_lock_args(mode, &ua->lksb, flags, namelen, timeout_cs,
David Teiglande5dae542008-02-06 00:35:45 -06005801 fake_astfn, ua, fake_bastfn, &args);
David Teigland597d0ca2006-07-12 16:44:04 -05005802 lkb->lkb_flags |= DLM_IFL_USER;
David Teigland597d0ca2006-07-12 16:44:04 -05005803
5804 if (error) {
5805 __put_lkb(ls, lkb);
5806 goto out;
5807 }
5808
5809 error = request_lock(ls, lkb, name, namelen, &args);
5810
5811 switch (error) {
5812 case 0:
5813 break;
5814 case -EINPROGRESS:
5815 error = 0;
5816 break;
5817 case -EAGAIN:
5818 error = 0;
5819 /* fall through */
5820 default:
5821 __put_lkb(ls, lkb);
5822 goto out;
5823 }
5824
5825 /* add this new lkb to the per-process list of locks */
5826 spin_lock(&ua->proc->locks_spin);
David Teiglandef0c2bb2007-03-28 09:56:46 -05005827 hold_lkb(lkb);
David Teigland597d0ca2006-07-12 16:44:04 -05005828 list_add_tail(&lkb->lkb_ownqueue, &ua->proc->locks);
5829 spin_unlock(&ua->proc->locks_spin);
5830 out:
David Teigland85e86ed2007-05-18 08:58:15 -05005831 dlm_unlock_recovery(ls);
David Teigland597d0ca2006-07-12 16:44:04 -05005832 return error;
5833}
5834
5835int dlm_user_convert(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
David Teiglandd7db9232007-05-18 09:00:32 -05005836 int mode, uint32_t flags, uint32_t lkid, char *lvb_in,
5837 unsigned long timeout_cs)
David Teigland597d0ca2006-07-12 16:44:04 -05005838{
5839 struct dlm_lkb *lkb;
5840 struct dlm_args args;
5841 struct dlm_user_args *ua;
5842 int error;
5843
David Teigland85e86ed2007-05-18 08:58:15 -05005844 dlm_lock_recovery(ls);
David Teigland597d0ca2006-07-12 16:44:04 -05005845
5846 error = find_lkb(ls, lkid, &lkb);
5847 if (error)
5848 goto out;
5849
5850 /* user can change the params on its lock when it converts it, or
5851 add an lvb that didn't exist before */
5852
David Teiglandd292c0c2008-02-06 23:27:04 -06005853 ua = lkb->lkb_ua;
David Teigland597d0ca2006-07-12 16:44:04 -05005854
5855 if (flags & DLM_LKF_VALBLK && !ua->lksb.sb_lvbptr) {
David Teigland573c24c2009-11-30 16:34:43 -06005856 ua->lksb.sb_lvbptr = kzalloc(DLM_USER_LVB_LEN, GFP_NOFS);
David Teigland597d0ca2006-07-12 16:44:04 -05005857 if (!ua->lksb.sb_lvbptr) {
5858 error = -ENOMEM;
5859 goto out_put;
5860 }
5861 }
5862 if (lvb_in && ua->lksb.sb_lvbptr)
5863 memcpy(ua->lksb.sb_lvbptr, lvb_in, DLM_USER_LVB_LEN);
5864
David Teiglandd7db9232007-05-18 09:00:32 -05005865 ua->xid = ua_tmp->xid;
David Teigland597d0ca2006-07-12 16:44:04 -05005866 ua->castparam = ua_tmp->castparam;
5867 ua->castaddr = ua_tmp->castaddr;
5868 ua->bastparam = ua_tmp->bastparam;
5869 ua->bastaddr = ua_tmp->bastaddr;
Patrick Caulfield10948eb2006-08-23 09:49:31 +01005870 ua->user_lksb = ua_tmp->user_lksb;
David Teigland597d0ca2006-07-12 16:44:04 -05005871
David Teiglandd7db9232007-05-18 09:00:32 -05005872 error = set_lock_args(mode, &ua->lksb, flags, 0, timeout_cs,
David Teiglande5dae542008-02-06 00:35:45 -06005873 fake_astfn, ua, fake_bastfn, &args);
David Teigland597d0ca2006-07-12 16:44:04 -05005874 if (error)
5875 goto out_put;
5876
5877 error = convert_lock(ls, lkb, &args);
5878
David Teiglandc85d65e2007-05-18 09:01:26 -05005879 if (error == -EINPROGRESS || error == -EAGAIN || error == -EDEADLK)
David Teigland597d0ca2006-07-12 16:44:04 -05005880 error = 0;
5881 out_put:
5882 dlm_put_lkb(lkb);
5883 out:
David Teigland85e86ed2007-05-18 08:58:15 -05005884 dlm_unlock_recovery(ls);
David Teigland597d0ca2006-07-12 16:44:04 -05005885 kfree(ua_tmp);
5886 return error;
5887}
5888
David Teigland2ab4bd82014-10-17 11:05:50 -05005889/*
5890 * The caller asks for an orphan lock on a given resource with a given mode.
5891 * If a matching lock exists, it's moved to the owner's list of locks and
5892 * the lkid is returned.
5893 */
5894
5895int dlm_user_adopt_orphan(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
5896 int mode, uint32_t flags, void *name, unsigned int namelen,
5897 unsigned long timeout_cs, uint32_t *lkid)
5898{
5899 struct dlm_lkb *lkb;
5900 struct dlm_user_args *ua;
5901 int found_other_mode = 0;
5902 int found = 0;
5903 int rv = 0;
5904
5905 mutex_lock(&ls->ls_orphans_mutex);
5906 list_for_each_entry(lkb, &ls->ls_orphans, lkb_ownqueue) {
5907 if (lkb->lkb_resource->res_length != namelen)
5908 continue;
5909 if (memcmp(lkb->lkb_resource->res_name, name, namelen))
5910 continue;
5911 if (lkb->lkb_grmode != mode) {
5912 found_other_mode = 1;
5913 continue;
5914 }
5915
5916 found = 1;
5917 list_del_init(&lkb->lkb_ownqueue);
5918 lkb->lkb_flags &= ~DLM_IFL_ORPHAN;
5919 *lkid = lkb->lkb_id;
5920 break;
5921 }
5922 mutex_unlock(&ls->ls_orphans_mutex);
5923
5924 if (!found && found_other_mode) {
5925 rv = -EAGAIN;
5926 goto out;
5927 }
5928
5929 if (!found) {
5930 rv = -ENOENT;
5931 goto out;
5932 }
5933
5934 lkb->lkb_exflags = flags;
5935 lkb->lkb_ownpid = (int) current->pid;
5936
5937 ua = lkb->lkb_ua;
5938
5939 ua->proc = ua_tmp->proc;
5940 ua->xid = ua_tmp->xid;
5941 ua->castparam = ua_tmp->castparam;
5942 ua->castaddr = ua_tmp->castaddr;
5943 ua->bastparam = ua_tmp->bastparam;
5944 ua->bastaddr = ua_tmp->bastaddr;
5945 ua->user_lksb = ua_tmp->user_lksb;
5946
5947 /*
5948 * The lkb reference from the ls_orphans list was not
5949 * removed above, and is now considered the reference
5950 * for the proc locks list.
5951 */
5952
5953 spin_lock(&ua->proc->locks_spin);
5954 list_add_tail(&lkb->lkb_ownqueue, &ua->proc->locks);
5955 spin_unlock(&ua->proc->locks_spin);
5956 out:
5957 kfree(ua_tmp);
5958 return rv;
5959}
5960
David Teigland597d0ca2006-07-12 16:44:04 -05005961int dlm_user_unlock(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
5962 uint32_t flags, uint32_t lkid, char *lvb_in)
5963{
5964 struct dlm_lkb *lkb;
5965 struct dlm_args args;
5966 struct dlm_user_args *ua;
5967 int error;
5968
David Teigland85e86ed2007-05-18 08:58:15 -05005969 dlm_lock_recovery(ls);
David Teigland597d0ca2006-07-12 16:44:04 -05005970
5971 error = find_lkb(ls, lkid, &lkb);
5972 if (error)
5973 goto out;
5974
David Teiglandd292c0c2008-02-06 23:27:04 -06005975 ua = lkb->lkb_ua;
David Teigland597d0ca2006-07-12 16:44:04 -05005976
5977 if (lvb_in && ua->lksb.sb_lvbptr)
5978 memcpy(ua->lksb.sb_lvbptr, lvb_in, DLM_USER_LVB_LEN);
Patrick Caulfieldb434eda2007-10-01 15:28:42 +01005979 if (ua_tmp->castparam)
5980 ua->castparam = ua_tmp->castparam;
Patrick Caulfieldcc346d52006-08-08 10:34:40 -04005981 ua->user_lksb = ua_tmp->user_lksb;
David Teigland597d0ca2006-07-12 16:44:04 -05005982
5983 error = set_unlock_args(flags, ua, &args);
5984 if (error)
5985 goto out_put;
5986
5987 error = unlock_lock(ls, lkb, &args);
5988
5989 if (error == -DLM_EUNLOCK)
5990 error = 0;
David Teiglandef0c2bb2007-03-28 09:56:46 -05005991 /* from validate_unlock_args() */
5992 if (error == -EBUSY && (flags & DLM_LKF_FORCEUNLOCK))
5993 error = 0;
David Teigland597d0ca2006-07-12 16:44:04 -05005994 if (error)
5995 goto out_put;
5996
5997 spin_lock(&ua->proc->locks_spin);
David Teigland23e8e1a2011-04-05 13:16:24 -05005998 /* dlm_user_add_cb() may have already taken lkb off the proc list */
David Teiglanda1bc86e2007-01-15 10:34:52 -06005999 if (!list_empty(&lkb->lkb_ownqueue))
6000 list_move(&lkb->lkb_ownqueue, &ua->proc->unlocking);
David Teigland597d0ca2006-07-12 16:44:04 -05006001 spin_unlock(&ua->proc->locks_spin);
David Teigland597d0ca2006-07-12 16:44:04 -05006002 out_put:
6003 dlm_put_lkb(lkb);
6004 out:
David Teigland85e86ed2007-05-18 08:58:15 -05006005 dlm_unlock_recovery(ls);
David Teiglandef0c2bb2007-03-28 09:56:46 -05006006 kfree(ua_tmp);
David Teigland597d0ca2006-07-12 16:44:04 -05006007 return error;
6008}
6009
6010int dlm_user_cancel(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
6011 uint32_t flags, uint32_t lkid)
6012{
6013 struct dlm_lkb *lkb;
6014 struct dlm_args args;
6015 struct dlm_user_args *ua;
6016 int error;
6017
David Teigland85e86ed2007-05-18 08:58:15 -05006018 dlm_lock_recovery(ls);
David Teigland597d0ca2006-07-12 16:44:04 -05006019
6020 error = find_lkb(ls, lkid, &lkb);
6021 if (error)
6022 goto out;
6023
David Teiglandd292c0c2008-02-06 23:27:04 -06006024 ua = lkb->lkb_ua;
Patrick Caulfieldb434eda2007-10-01 15:28:42 +01006025 if (ua_tmp->castparam)
6026 ua->castparam = ua_tmp->castparam;
Patrick Caulfieldc059f702006-08-23 10:24:03 +01006027 ua->user_lksb = ua_tmp->user_lksb;
David Teigland597d0ca2006-07-12 16:44:04 -05006028
6029 error = set_unlock_args(flags, ua, &args);
6030 if (error)
6031 goto out_put;
6032
6033 error = cancel_lock(ls, lkb, &args);
6034
6035 if (error == -DLM_ECANCEL)
6036 error = 0;
David Teiglandef0c2bb2007-03-28 09:56:46 -05006037 /* from validate_unlock_args() */
6038 if (error == -EBUSY)
6039 error = 0;
David Teigland597d0ca2006-07-12 16:44:04 -05006040 out_put:
6041 dlm_put_lkb(lkb);
6042 out:
David Teigland85e86ed2007-05-18 08:58:15 -05006043 dlm_unlock_recovery(ls);
David Teiglandef0c2bb2007-03-28 09:56:46 -05006044 kfree(ua_tmp);
David Teigland597d0ca2006-07-12 16:44:04 -05006045 return error;
6046}
6047
David Teigland8b4021f2007-05-29 08:46:00 -05006048int dlm_user_deadlock(struct dlm_ls *ls, uint32_t flags, uint32_t lkid)
6049{
6050 struct dlm_lkb *lkb;
6051 struct dlm_args args;
6052 struct dlm_user_args *ua;
6053 struct dlm_rsb *r;
6054 int error;
6055
6056 dlm_lock_recovery(ls);
6057
6058 error = find_lkb(ls, lkid, &lkb);
6059 if (error)
6060 goto out;
6061
David Teiglandd292c0c2008-02-06 23:27:04 -06006062 ua = lkb->lkb_ua;
David Teigland8b4021f2007-05-29 08:46:00 -05006063
6064 error = set_unlock_args(flags, ua, &args);
6065 if (error)
6066 goto out_put;
6067
6068 /* same as cancel_lock(), but set DEADLOCK_CANCEL after lock_rsb */
6069
6070 r = lkb->lkb_resource;
6071 hold_rsb(r);
6072 lock_rsb(r);
6073
6074 error = validate_unlock_args(lkb, &args);
6075 if (error)
6076 goto out_r;
6077 lkb->lkb_flags |= DLM_IFL_DEADLOCK_CANCEL;
6078
6079 error = _cancel_lock(r, lkb);
6080 out_r:
6081 unlock_rsb(r);
6082 put_rsb(r);
6083
6084 if (error == -DLM_ECANCEL)
6085 error = 0;
6086 /* from validate_unlock_args() */
6087 if (error == -EBUSY)
6088 error = 0;
6089 out_put:
6090 dlm_put_lkb(lkb);
6091 out:
6092 dlm_unlock_recovery(ls);
6093 return error;
6094}
6095
David Teiglandef0c2bb2007-03-28 09:56:46 -05006096/* lkb's that are removed from the waiters list by revert are just left on the
6097 orphans list with the granted orphan locks, to be freed by purge */
6098
David Teigland597d0ca2006-07-12 16:44:04 -05006099static int orphan_proc_lock(struct dlm_ls *ls, struct dlm_lkb *lkb)
6100{
David Teiglandef0c2bb2007-03-28 09:56:46 -05006101 struct dlm_args args;
6102 int error;
David Teigland597d0ca2006-07-12 16:44:04 -05006103
David Teigland2ab4bd82014-10-17 11:05:50 -05006104 hold_lkb(lkb); /* reference for the ls_orphans list */
David Teiglandef0c2bb2007-03-28 09:56:46 -05006105 mutex_lock(&ls->ls_orphans_mutex);
6106 list_add_tail(&lkb->lkb_ownqueue, &ls->ls_orphans);
6107 mutex_unlock(&ls->ls_orphans_mutex);
David Teigland597d0ca2006-07-12 16:44:04 -05006108
David Teiglandd292c0c2008-02-06 23:27:04 -06006109 set_unlock_args(0, lkb->lkb_ua, &args);
David Teiglandef0c2bb2007-03-28 09:56:46 -05006110
6111 error = cancel_lock(ls, lkb, &args);
6112 if (error == -DLM_ECANCEL)
6113 error = 0;
6114 return error;
David Teigland597d0ca2006-07-12 16:44:04 -05006115}
6116
David Teiglandda8c6662012-11-15 15:01:51 -06006117/* The FORCEUNLOCK flag allows the unlock to go ahead even if the lkb isn't
6118 granted. Regardless of what rsb queue the lock is on, it's removed and
6119 freed. The IVVALBLK flag causes the lvb on the resource to be invalidated
6120 if our lock is PW/EX (it's ignored if our granted mode is smaller.) */
David Teigland597d0ca2006-07-12 16:44:04 -05006121
6122static int unlock_proc_lock(struct dlm_ls *ls, struct dlm_lkb *lkb)
6123{
David Teigland597d0ca2006-07-12 16:44:04 -05006124 struct dlm_args args;
6125 int error;
6126
David Teiglandda8c6662012-11-15 15:01:51 -06006127 set_unlock_args(DLM_LKF_FORCEUNLOCK | DLM_LKF_IVVALBLK,
6128 lkb->lkb_ua, &args);
David Teigland597d0ca2006-07-12 16:44:04 -05006129
6130 error = unlock_lock(ls, lkb, &args);
6131 if (error == -DLM_EUNLOCK)
6132 error = 0;
6133 return error;
6134}
6135
David Teiglandef0c2bb2007-03-28 09:56:46 -05006136/* We have to release clear_proc_locks mutex before calling unlock_proc_lock()
6137 (which does lock_rsb) due to deadlock with receiving a message that does
David Teigland23e8e1a2011-04-05 13:16:24 -05006138 lock_rsb followed by dlm_user_add_cb() */
David Teiglandef0c2bb2007-03-28 09:56:46 -05006139
6140static struct dlm_lkb *del_proc_lock(struct dlm_ls *ls,
6141 struct dlm_user_proc *proc)
6142{
6143 struct dlm_lkb *lkb = NULL;
6144
6145 mutex_lock(&ls->ls_clear_proc_locks);
6146 if (list_empty(&proc->locks))
6147 goto out;
6148
6149 lkb = list_entry(proc->locks.next, struct dlm_lkb, lkb_ownqueue);
6150 list_del_init(&lkb->lkb_ownqueue);
6151
6152 if (lkb->lkb_exflags & DLM_LKF_PERSISTENT)
6153 lkb->lkb_flags |= DLM_IFL_ORPHAN;
6154 else
6155 lkb->lkb_flags |= DLM_IFL_DEAD;
6156 out:
6157 mutex_unlock(&ls->ls_clear_proc_locks);
6158 return lkb;
6159}
6160
David Teigland23e8e1a2011-04-05 13:16:24 -05006161/* The ls_clear_proc_locks mutex protects against dlm_user_add_cb() which
David Teigland597d0ca2006-07-12 16:44:04 -05006162 1) references lkb->ua which we free here and 2) adds lkbs to proc->asts,
6163 which we clear here. */
6164
6165/* proc CLOSING flag is set so no more device_reads should look at proc->asts
6166 list, and no more device_writes should add lkb's to proc->locks list; so we
6167 shouldn't need to take asts_spin or locks_spin here. this assumes that
6168 device reads/writes/closes are serialized -- FIXME: we may need to serialize
6169 them ourself. */
6170
6171void dlm_clear_proc_locks(struct dlm_ls *ls, struct dlm_user_proc *proc)
6172{
6173 struct dlm_lkb *lkb, *safe;
6174
David Teigland85e86ed2007-05-18 08:58:15 -05006175 dlm_lock_recovery(ls);
David Teigland597d0ca2006-07-12 16:44:04 -05006176
David Teiglandef0c2bb2007-03-28 09:56:46 -05006177 while (1) {
6178 lkb = del_proc_lock(ls, proc);
6179 if (!lkb)
6180 break;
David Teigland84d8cd62007-05-29 08:44:23 -05006181 del_timeout(lkb);
David Teiglandef0c2bb2007-03-28 09:56:46 -05006182 if (lkb->lkb_exflags & DLM_LKF_PERSISTENT)
David Teigland597d0ca2006-07-12 16:44:04 -05006183 orphan_proc_lock(ls, lkb);
David Teiglandef0c2bb2007-03-28 09:56:46 -05006184 else
David Teigland597d0ca2006-07-12 16:44:04 -05006185 unlock_proc_lock(ls, lkb);
David Teigland597d0ca2006-07-12 16:44:04 -05006186
6187 /* this removes the reference for the proc->locks list
6188 added by dlm_user_request, it may result in the lkb
6189 being freed */
6190
6191 dlm_put_lkb(lkb);
6192 }
David Teiglanda1bc86e2007-01-15 10:34:52 -06006193
David Teiglandef0c2bb2007-03-28 09:56:46 -05006194 mutex_lock(&ls->ls_clear_proc_locks);
6195
David Teiglanda1bc86e2007-01-15 10:34:52 -06006196 /* in-progress unlocks */
6197 list_for_each_entry_safe(lkb, safe, &proc->unlocking, lkb_ownqueue) {
6198 list_del_init(&lkb->lkb_ownqueue);
6199 lkb->lkb_flags |= DLM_IFL_DEAD;
6200 dlm_put_lkb(lkb);
6201 }
6202
David Teigland23e8e1a2011-04-05 13:16:24 -05006203 list_for_each_entry_safe(lkb, safe, &proc->asts, lkb_cb_list) {
David Teigland8304d6f2011-02-21 14:58:21 -06006204 memset(&lkb->lkb_callbacks, 0,
6205 sizeof(struct dlm_callback) * DLM_CALLBACKS_SIZE);
David Teigland23e8e1a2011-04-05 13:16:24 -05006206 list_del_init(&lkb->lkb_cb_list);
David Teiglanda1bc86e2007-01-15 10:34:52 -06006207 dlm_put_lkb(lkb);
6208 }
6209
David Teigland597d0ca2006-07-12 16:44:04 -05006210 mutex_unlock(&ls->ls_clear_proc_locks);
David Teigland85e86ed2007-05-18 08:58:15 -05006211 dlm_unlock_recovery(ls);
David Teigland597d0ca2006-07-12 16:44:04 -05006212}
David Teiglanda1bc86e2007-01-15 10:34:52 -06006213
David Teigland84991372007-03-30 15:02:40 -05006214static void purge_proc_locks(struct dlm_ls *ls, struct dlm_user_proc *proc)
6215{
6216 struct dlm_lkb *lkb, *safe;
6217
6218 while (1) {
6219 lkb = NULL;
6220 spin_lock(&proc->locks_spin);
6221 if (!list_empty(&proc->locks)) {
6222 lkb = list_entry(proc->locks.next, struct dlm_lkb,
6223 lkb_ownqueue);
6224 list_del_init(&lkb->lkb_ownqueue);
6225 }
6226 spin_unlock(&proc->locks_spin);
6227
6228 if (!lkb)
6229 break;
6230
6231 lkb->lkb_flags |= DLM_IFL_DEAD;
6232 unlock_proc_lock(ls, lkb);
6233 dlm_put_lkb(lkb); /* ref from proc->locks list */
6234 }
6235
6236 spin_lock(&proc->locks_spin);
6237 list_for_each_entry_safe(lkb, safe, &proc->unlocking, lkb_ownqueue) {
6238 list_del_init(&lkb->lkb_ownqueue);
6239 lkb->lkb_flags |= DLM_IFL_DEAD;
6240 dlm_put_lkb(lkb);
6241 }
6242 spin_unlock(&proc->locks_spin);
6243
6244 spin_lock(&proc->asts_spin);
David Teigland23e8e1a2011-04-05 13:16:24 -05006245 list_for_each_entry_safe(lkb, safe, &proc->asts, lkb_cb_list) {
David Teigland8304d6f2011-02-21 14:58:21 -06006246 memset(&lkb->lkb_callbacks, 0,
6247 sizeof(struct dlm_callback) * DLM_CALLBACKS_SIZE);
David Teigland23e8e1a2011-04-05 13:16:24 -05006248 list_del_init(&lkb->lkb_cb_list);
David Teigland84991372007-03-30 15:02:40 -05006249 dlm_put_lkb(lkb);
6250 }
6251 spin_unlock(&proc->asts_spin);
6252}
6253
6254/* pid of 0 means purge all orphans */
6255
6256static void do_purge(struct dlm_ls *ls, int nodeid, int pid)
6257{
6258 struct dlm_lkb *lkb, *safe;
6259
6260 mutex_lock(&ls->ls_orphans_mutex);
6261 list_for_each_entry_safe(lkb, safe, &ls->ls_orphans, lkb_ownqueue) {
6262 if (pid && lkb->lkb_ownpid != pid)
6263 continue;
6264 unlock_proc_lock(ls, lkb);
6265 list_del_init(&lkb->lkb_ownqueue);
6266 dlm_put_lkb(lkb);
6267 }
6268 mutex_unlock(&ls->ls_orphans_mutex);
6269}
6270
6271static int send_purge(struct dlm_ls *ls, int nodeid, int pid)
6272{
6273 struct dlm_message *ms;
6274 struct dlm_mhandle *mh;
6275 int error;
6276
6277 error = _create_message(ls, sizeof(struct dlm_message), nodeid,
6278 DLM_MSG_PURGE, &ms, &mh);
6279 if (error)
6280 return error;
6281 ms->m_nodeid = nodeid;
6282 ms->m_pid = pid;
6283
6284 return send_message(mh, ms);
6285}
6286
6287int dlm_user_purge(struct dlm_ls *ls, struct dlm_user_proc *proc,
6288 int nodeid, int pid)
6289{
6290 int error = 0;
6291
David Teigland2ab4bd82014-10-17 11:05:50 -05006292 if (nodeid && (nodeid != dlm_our_nodeid())) {
David Teigland84991372007-03-30 15:02:40 -05006293 error = send_purge(ls, nodeid, pid);
6294 } else {
David Teigland85e86ed2007-05-18 08:58:15 -05006295 dlm_lock_recovery(ls);
David Teigland84991372007-03-30 15:02:40 -05006296 if (pid == current->pid)
6297 purge_proc_locks(ls, proc);
6298 else
6299 do_purge(ls, nodeid, pid);
David Teigland85e86ed2007-05-18 08:58:15 -05006300 dlm_unlock_recovery(ls);
David Teigland84991372007-03-30 15:02:40 -05006301 }
6302 return error;
6303}
6304