1328970deSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
2fa60ce2cSMasahiro Yamada /*
36714d8e8SKurt Hackel * dlmdomain.c
46714d8e8SKurt Hackel *
56714d8e8SKurt Hackel * defines domain join / leave apis
66714d8e8SKurt Hackel *
76714d8e8SKurt Hackel * Copyright (C) 2004 Oracle. All rights reserved.
86714d8e8SKurt Hackel */
96714d8e8SKurt Hackel
106714d8e8SKurt Hackel #include <linux/module.h>
116714d8e8SKurt Hackel #include <linux/types.h>
126714d8e8SKurt Hackel #include <linux/slab.h>
136714d8e8SKurt Hackel #include <linux/highmem.h>
146714d8e8SKurt Hackel #include <linux/init.h>
156714d8e8SKurt Hackel #include <linux/spinlock.h>
166714d8e8SKurt Hackel #include <linux/delay.h>
176714d8e8SKurt Hackel #include <linux/err.h>
186325b4a2SSunil Mushran #include <linux/debugfs.h>
19174cd4b1SIngo Molnar #include <linux/sched/signal.h>
206714d8e8SKurt Hackel
21ca322fb6SMasahiro Yamada #include "../cluster/heartbeat.h"
22ca322fb6SMasahiro Yamada #include "../cluster/nodemanager.h"
23ca322fb6SMasahiro Yamada #include "../cluster/tcp.h"
246714d8e8SKurt Hackel
256714d8e8SKurt Hackel #include "dlmapi.h"
266714d8e8SKurt Hackel #include "dlmcommon.h"
276714d8e8SKurt Hackel #include "dlmdomain.h"
286325b4a2SSunil Mushran #include "dlmdebug.h"
296714d8e8SKurt Hackel
306714d8e8SKurt Hackel #define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_DOMAIN)
31ca322fb6SMasahiro Yamada #include "../cluster/masklog.h"
326714d8e8SKurt Hackel
331faf2894SSrinivas Eeda /*
341faf2894SSrinivas Eeda * ocfs2 node maps are array of long int, which limits to send them freely
351faf2894SSrinivas Eeda * across the wire due to endianness issues. To workaround this, we convert
361faf2894SSrinivas Eeda * long ints to byte arrays. Following 3 routines are helper functions to
371faf2894SSrinivas Eeda * set/test/copy bits within those array of bytes
381faf2894SSrinivas Eeda */
byte_set_bit(u8 nr,u8 map[])391faf2894SSrinivas Eeda static inline void byte_set_bit(u8 nr, u8 map[])
401faf2894SSrinivas Eeda {
411faf2894SSrinivas Eeda map[nr >> 3] |= (1UL << (nr & 7));
421faf2894SSrinivas Eeda }
431faf2894SSrinivas Eeda
byte_test_bit(u8 nr,u8 map[])441faf2894SSrinivas Eeda static inline int byte_test_bit(u8 nr, u8 map[])
451faf2894SSrinivas Eeda {
461faf2894SSrinivas Eeda return ((1UL << (nr & 7)) & (map[nr >> 3])) != 0;
471faf2894SSrinivas Eeda }
481faf2894SSrinivas Eeda
byte_copymap(u8 dmap[],unsigned long smap[],unsigned int sz)491faf2894SSrinivas Eeda static inline void byte_copymap(u8 dmap[], unsigned long smap[],
501faf2894SSrinivas Eeda unsigned int sz)
511faf2894SSrinivas Eeda {
521faf2894SSrinivas Eeda unsigned int nn;
531faf2894SSrinivas Eeda
541faf2894SSrinivas Eeda if (!sz)
551faf2894SSrinivas Eeda return;
561faf2894SSrinivas Eeda
571faf2894SSrinivas Eeda memset(dmap, 0, ((sz + 7) >> 3));
581faf2894SSrinivas Eeda for (nn = 0 ; nn < sz; nn++)
591faf2894SSrinivas Eeda if (test_bit(nn, smap))
601faf2894SSrinivas Eeda byte_set_bit(nn, dmap);
611faf2894SSrinivas Eeda }
621faf2894SSrinivas Eeda
dlm_free_pagevec(void ** vec,int pages)6303d864c0SDaniel Phillips static void dlm_free_pagevec(void **vec, int pages)
6403d864c0SDaniel Phillips {
6503d864c0SDaniel Phillips while (pages--)
6603d864c0SDaniel Phillips free_page((unsigned long)vec[pages]);
6703d864c0SDaniel Phillips kfree(vec);
6803d864c0SDaniel Phillips }
6903d864c0SDaniel Phillips
dlm_alloc_pagevec(int pages)7003d864c0SDaniel Phillips static void **dlm_alloc_pagevec(int pages)
7103d864c0SDaniel Phillips {
726da2ec56SKees Cook void **vec = kmalloc_array(pages, sizeof(void *), GFP_KERNEL);
7303d864c0SDaniel Phillips int i;
7403d864c0SDaniel Phillips
7503d864c0SDaniel Phillips if (!vec)
7603d864c0SDaniel Phillips return NULL;
7703d864c0SDaniel Phillips
7803d864c0SDaniel Phillips for (i = 0; i < pages; i++)
7903d864c0SDaniel Phillips if (!(vec[i] = (void *)__get_free_page(GFP_KERNEL)))
8003d864c0SDaniel Phillips goto out_free;
81c8f33b6eSJoel Becker
82685f1adbSMark Fasheh mlog(0, "Allocated DLM hash pagevec; %d pages (%lu expected), %lu buckets per page\n",
83f5a923d1SMark Fasheh pages, (unsigned long)DLM_HASH_PAGES,
84f5a923d1SMark Fasheh (unsigned long)DLM_BUCKETS_PER_PAGE);
8503d864c0SDaniel Phillips return vec;
8603d864c0SDaniel Phillips out_free:
8703d864c0SDaniel Phillips dlm_free_pagevec(vec, i);
8803d864c0SDaniel Phillips return NULL;
8903d864c0SDaniel Phillips }
9003d864c0SDaniel Phillips
916714d8e8SKurt Hackel /*
926714d8e8SKurt Hackel *
936714d8e8SKurt Hackel * spinlock lock ordering: if multiple locks are needed, obey this ordering:
946714d8e8SKurt Hackel * dlm_domain_lock
956714d8e8SKurt Hackel * struct dlm_ctxt->spinlock
966714d8e8SKurt Hackel * struct dlm_lock_resource->spinlock
976714d8e8SKurt Hackel * struct dlm_ctxt->master_lock
986714d8e8SKurt Hackel * struct dlm_ctxt->ast_lock
996714d8e8SKurt Hackel * dlm_master_list_entry->spinlock
1006714d8e8SKurt Hackel * dlm_lock->spinlock
1016714d8e8SKurt Hackel *
1026714d8e8SKurt Hackel */
1036714d8e8SKurt Hackel
10434af946aSIngo Molnar DEFINE_SPINLOCK(dlm_domain_lock);
1056714d8e8SKurt Hackel LIST_HEAD(dlm_domains);
1066714d8e8SKurt Hackel static DECLARE_WAIT_QUEUE_HEAD(dlm_domain_events);
1076714d8e8SKurt Hackel
108d24fbcdaSJoel Becker /*
109d24fbcdaSJoel Becker * The supported protocol version for DLM communication. Running domains
110d24fbcdaSJoel Becker * will have a negotiated version with the same major number and a minor
111d24fbcdaSJoel Becker * number equal or smaller. The dlm_ctxt->dlm_locking_proto field should
112d24fbcdaSJoel Becker * be used to determine what a running domain is actually using.
113ea203441SSunil Mushran *
114ea203441SSunil Mushran * New in version 1.1:
115ea203441SSunil Mushran * - Message DLM_QUERY_REGION added to support global heartbeat
11618cfdf1bSSunil Mushran * - Message DLM_QUERY_NODEINFO added to allow online node removes
117bddefdeeSSunil Mushran * New in version 1.2:
118bddefdeeSSunil Mushran * - Message DLM_BEGIN_EXIT_DOMAIN_MSG added to mark start of exit domain
11960d663cbSxuejiufei * New in version 1.3:
12060d663cbSxuejiufei * - Message DLM_DEREF_LOCKRES_DONE added to inform non-master that the
12160d663cbSxuejiufei * refmap is cleared
122d24fbcdaSJoel Becker */
123d24fbcdaSJoel Becker static const struct dlm_protocol_version dlm_protocol = {
124d24fbcdaSJoel Becker .pv_major = 1,
12560d663cbSxuejiufei .pv_minor = 3,
126d24fbcdaSJoel Becker };
127d24fbcdaSJoel Becker
1286714d8e8SKurt Hackel #define DLM_DOMAIN_BACKOFF_MS 200
1296714d8e8SKurt Hackel
130d74c9803SKurt Hackel static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data,
131d74c9803SKurt Hackel void **ret_data);
132d74c9803SKurt Hackel static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data,
133d74c9803SKurt Hackel void **ret_data);
134d74c9803SKurt Hackel static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data,
135d74c9803SKurt Hackel void **ret_data);
136ea203441SSunil Mushran static int dlm_query_region_handler(struct o2net_msg *msg, u32 len,
137ea203441SSunil Mushran void *data, void **ret_data);
138d74c9803SKurt Hackel static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data,
139d74c9803SKurt Hackel void **ret_data);
140d24fbcdaSJoel Becker static int dlm_protocol_compare(struct dlm_protocol_version *existing,
141d24fbcdaSJoel Becker struct dlm_protocol_version *request);
1426714d8e8SKurt Hackel
1436714d8e8SKurt Hackel static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm);
1446714d8e8SKurt Hackel
__dlm_unhash_lockres(struct dlm_ctxt * dlm,struct dlm_lock_resource * res)145e9f0b6a6SSunil Mushran void __dlm_unhash_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res)
1466714d8e8SKurt Hackel {
147e9f0b6a6SSunil Mushran if (hlist_unhashed(&res->hash_node))
148e9f0b6a6SSunil Mushran return;
149e9f0b6a6SSunil Mushran
150e9f0b6a6SSunil Mushran mlog(0, "%s: Unhash res %.*s\n", dlm->name, res->lockname.len,
151e9f0b6a6SSunil Mushran res->lockname.name);
152e9f0b6a6SSunil Mushran hlist_del_init(&res->hash_node);
153e9f0b6a6SSunil Mushran dlm_lockres_put(res);
15478062cb2SSunil Mushran }
1556714d8e8SKurt Hackel
__dlm_insert_lockres(struct dlm_ctxt * dlm,struct dlm_lock_resource * res)156e9f0b6a6SSunil Mushran void __dlm_insert_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res)
1576714d8e8SKurt Hackel {
15881f2094aSMark Fasheh struct hlist_head *bucket;
1596714d8e8SKurt Hackel
1606714d8e8SKurt Hackel assert_spin_locked(&dlm->spinlock);
1616714d8e8SKurt Hackel
162612645f7SAl Viro bucket = dlm_lockres_hash(dlm, res->lockname.hash);
1636714d8e8SKurt Hackel
1646714d8e8SKurt Hackel /* get a reference for our hashtable */
1656714d8e8SKurt Hackel dlm_lockres_get(res);
1666714d8e8SKurt Hackel
16781f2094aSMark Fasheh hlist_add_head(&res->hash_node, bucket);
168e9f0b6a6SSunil Mushran
169e9f0b6a6SSunil Mushran mlog(0, "%s: Hash res %.*s\n", dlm->name, res->lockname.len,
170e9f0b6a6SSunil Mushran res->lockname.name);
1716714d8e8SKurt Hackel }
1726714d8e8SKurt Hackel
__dlm_lookup_lockres_full(struct dlm_ctxt * dlm,const char * name,unsigned int len,unsigned int hash)173ba2bf218SKurt Hackel struct dlm_lock_resource * __dlm_lookup_lockres_full(struct dlm_ctxt *dlm,
1746714d8e8SKurt Hackel const char *name,
175a3d33291SMark Fasheh unsigned int len,
176a3d33291SMark Fasheh unsigned int hash)
1776714d8e8SKurt Hackel {
17881f2094aSMark Fasheh struct hlist_head *bucket;
179df53cd3bSDong Fang struct dlm_lock_resource *res;
1806714d8e8SKurt Hackel
181ef6b689bSTao Ma mlog(0, "%.*s\n", len, name);
1826714d8e8SKurt Hackel
1836714d8e8SKurt Hackel assert_spin_locked(&dlm->spinlock);
1846714d8e8SKurt Hackel
18503d864c0SDaniel Phillips bucket = dlm_lockres_hash(dlm, hash);
18603d864c0SDaniel Phillips
187df53cd3bSDong Fang hlist_for_each_entry(res, bucket, hash_node) {
1884198985fSDaniel Phillips if (res->lockname.name[0] != name[0])
1894198985fSDaniel Phillips continue;
1904198985fSDaniel Phillips if (unlikely(res->lockname.len != len))
1914198985fSDaniel Phillips continue;
1924198985fSDaniel Phillips if (memcmp(res->lockname.name + 1, name + 1, len - 1))
1934198985fSDaniel Phillips continue;
1944198985fSDaniel Phillips dlm_lockres_get(res);
1954198985fSDaniel Phillips return res;
1966714d8e8SKurt Hackel }
1974198985fSDaniel Phillips return NULL;
1986714d8e8SKurt Hackel }
1996714d8e8SKurt Hackel
200ba2bf218SKurt Hackel /* intended to be called by functions which do not care about lock
201ba2bf218SKurt Hackel * resources which are being purged (most net _handler functions).
202ba2bf218SKurt Hackel * this will return NULL for any lock resource which is found but
203ba2bf218SKurt Hackel * currently in the process of dropping its mastery reference.
204ba2bf218SKurt Hackel * use __dlm_lookup_lockres_full when you need the lock resource
205ba2bf218SKurt Hackel * regardless (e.g. dlm_get_lock_resource) */
__dlm_lookup_lockres(struct dlm_ctxt * dlm,const char * name,unsigned int len,unsigned int hash)206ba2bf218SKurt Hackel struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm,
207ba2bf218SKurt Hackel const char *name,
208ba2bf218SKurt Hackel unsigned int len,
209ba2bf218SKurt Hackel unsigned int hash)
210ba2bf218SKurt Hackel {
211ba2bf218SKurt Hackel struct dlm_lock_resource *res = NULL;
212ba2bf218SKurt Hackel
213ef6b689bSTao Ma mlog(0, "%.*s\n", len, name);
214ba2bf218SKurt Hackel
215ba2bf218SKurt Hackel assert_spin_locked(&dlm->spinlock);
216ba2bf218SKurt Hackel
217ba2bf218SKurt Hackel res = __dlm_lookup_lockres_full(dlm, name, len, hash);
218ba2bf218SKurt Hackel if (res) {
219ba2bf218SKurt Hackel spin_lock(&res->spinlock);
220ba2bf218SKurt Hackel if (res->state & DLM_LOCK_RES_DROPPING_REF) {
221ba2bf218SKurt Hackel spin_unlock(&res->spinlock);
222ba2bf218SKurt Hackel dlm_lockres_put(res);
223ba2bf218SKurt Hackel return NULL;
224ba2bf218SKurt Hackel }
225ba2bf218SKurt Hackel spin_unlock(&res->spinlock);
226ba2bf218SKurt Hackel }
227ba2bf218SKurt Hackel
228ba2bf218SKurt Hackel return res;
229ba2bf218SKurt Hackel }
230ba2bf218SKurt Hackel
dlm_lookup_lockres(struct dlm_ctxt * dlm,const char * name,unsigned int len)2316714d8e8SKurt Hackel struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm,
2326714d8e8SKurt Hackel const char *name,
2336714d8e8SKurt Hackel unsigned int len)
2346714d8e8SKurt Hackel {
2356714d8e8SKurt Hackel struct dlm_lock_resource *res;
236a3d33291SMark Fasheh unsigned int hash = dlm_lockid_hash(name, len);
2376714d8e8SKurt Hackel
2386714d8e8SKurt Hackel spin_lock(&dlm->spinlock);
239a3d33291SMark Fasheh res = __dlm_lookup_lockres(dlm, name, len, hash);
2406714d8e8SKurt Hackel spin_unlock(&dlm->spinlock);
2416714d8e8SKurt Hackel return res;
2426714d8e8SKurt Hackel }
2436714d8e8SKurt Hackel
__dlm_lookup_domain_full(const char * domain,int len)2446714d8e8SKurt Hackel static struct dlm_ctxt * __dlm_lookup_domain_full(const char *domain, int len)
2456714d8e8SKurt Hackel {
246df53cd3bSDong Fang struct dlm_ctxt *tmp;
2476714d8e8SKurt Hackel
2486714d8e8SKurt Hackel assert_spin_locked(&dlm_domain_lock);
2496714d8e8SKurt Hackel
2506714d8e8SKurt Hackel /* tmp->name here is always NULL terminated,
2516714d8e8SKurt Hackel * but domain may not be! */
252df53cd3bSDong Fang list_for_each_entry(tmp, &dlm_domains, list) {
2536714d8e8SKurt Hackel if (strlen(tmp->name) == len &&
2546714d8e8SKurt Hackel memcmp(tmp->name, domain, len)==0)
255df53cd3bSDong Fang return tmp;
2566714d8e8SKurt Hackel }
2576714d8e8SKurt Hackel
258df53cd3bSDong Fang return NULL;
2596714d8e8SKurt Hackel }
2606714d8e8SKurt Hackel
2616714d8e8SKurt Hackel /* For null terminated domain strings ONLY */
__dlm_lookup_domain(const char * domain)2626714d8e8SKurt Hackel static struct dlm_ctxt * __dlm_lookup_domain(const char *domain)
2636714d8e8SKurt Hackel {
2646714d8e8SKurt Hackel assert_spin_locked(&dlm_domain_lock);
2656714d8e8SKurt Hackel
2666714d8e8SKurt Hackel return __dlm_lookup_domain_full(domain, strlen(domain));
2676714d8e8SKurt Hackel }
2686714d8e8SKurt Hackel
2696714d8e8SKurt Hackel
2706714d8e8SKurt Hackel /* returns true on one of two conditions:
2716714d8e8SKurt Hackel * 1) the domain does not exist
2726714d8e8SKurt Hackel * 2) the domain exists and it's state is "joined" */
dlm_wait_on_domain_helper(const char * domain)2736714d8e8SKurt Hackel static int dlm_wait_on_domain_helper(const char *domain)
2746714d8e8SKurt Hackel {
2756714d8e8SKurt Hackel int ret = 0;
2766714d8e8SKurt Hackel struct dlm_ctxt *tmp = NULL;
2776714d8e8SKurt Hackel
2786714d8e8SKurt Hackel spin_lock(&dlm_domain_lock);
2796714d8e8SKurt Hackel
2806714d8e8SKurt Hackel tmp = __dlm_lookup_domain(domain);
2816714d8e8SKurt Hackel if (!tmp)
2826714d8e8SKurt Hackel ret = 1;
2836714d8e8SKurt Hackel else if (tmp->dlm_state == DLM_CTXT_JOINED)
2846714d8e8SKurt Hackel ret = 1;
2856714d8e8SKurt Hackel
2866714d8e8SKurt Hackel spin_unlock(&dlm_domain_lock);
2876714d8e8SKurt Hackel return ret;
2886714d8e8SKurt Hackel }
2896714d8e8SKurt Hackel
dlm_free_ctxt_mem(struct dlm_ctxt * dlm)2906714d8e8SKurt Hackel static void dlm_free_ctxt_mem(struct dlm_ctxt *dlm)
2916714d8e8SKurt Hackel {
2926325b4a2SSunil Mushran dlm_destroy_debugfs_subroot(dlm);
2936325b4a2SSunil Mushran
29481f2094aSMark Fasheh if (dlm->lockres_hash)
29503d864c0SDaniel Phillips dlm_free_pagevec((void **)dlm->lockres_hash, DLM_HASH_PAGES);
2966714d8e8SKurt Hackel
297e2b66ddcSSunil Mushran if (dlm->master_hash)
298e2b66ddcSSunil Mushran dlm_free_pagevec((void **)dlm->master_hash, DLM_HASH_PAGES);
299e2b66ddcSSunil Mushran
3006714d8e8SKurt Hackel kfree(dlm->name);
3016714d8e8SKurt Hackel kfree(dlm);
3026714d8e8SKurt Hackel }
3036714d8e8SKurt Hackel
3046714d8e8SKurt Hackel /* A little strange - this function will be called while holding
3056714d8e8SKurt Hackel * dlm_domain_lock and is expected to be holding it on the way out. We
3066714d8e8SKurt Hackel * will however drop and reacquire it multiple times */
dlm_ctxt_release(struct kref * kref)3076714d8e8SKurt Hackel static void dlm_ctxt_release(struct kref *kref)
3086714d8e8SKurt Hackel {
3096714d8e8SKurt Hackel struct dlm_ctxt *dlm;
3106714d8e8SKurt Hackel
3116714d8e8SKurt Hackel dlm = container_of(kref, struct dlm_ctxt, dlm_refs);
3126714d8e8SKurt Hackel
3136714d8e8SKurt Hackel BUG_ON(dlm->num_joins);
3146714d8e8SKurt Hackel BUG_ON(dlm->dlm_state == DLM_CTXT_JOINED);
3156714d8e8SKurt Hackel
3166714d8e8SKurt Hackel /* we may still be in the list if we hit an error during join. */
3176714d8e8SKurt Hackel list_del_init(&dlm->list);
3186714d8e8SKurt Hackel
3196714d8e8SKurt Hackel spin_unlock(&dlm_domain_lock);
3206714d8e8SKurt Hackel
3216714d8e8SKurt Hackel mlog(0, "freeing memory from domain %s\n", dlm->name);
3226714d8e8SKurt Hackel
3236714d8e8SKurt Hackel wake_up(&dlm_domain_events);
3246714d8e8SKurt Hackel
3256714d8e8SKurt Hackel dlm_free_ctxt_mem(dlm);
3266714d8e8SKurt Hackel
3276714d8e8SKurt Hackel spin_lock(&dlm_domain_lock);
3286714d8e8SKurt Hackel }
3296714d8e8SKurt Hackel
dlm_put(struct dlm_ctxt * dlm)3306714d8e8SKurt Hackel void dlm_put(struct dlm_ctxt *dlm)
3316714d8e8SKurt Hackel {
3326714d8e8SKurt Hackel spin_lock(&dlm_domain_lock);
3336714d8e8SKurt Hackel kref_put(&dlm->dlm_refs, dlm_ctxt_release);
3346714d8e8SKurt Hackel spin_unlock(&dlm_domain_lock);
3356714d8e8SKurt Hackel }
3366714d8e8SKurt Hackel
__dlm_get(struct dlm_ctxt * dlm)3376714d8e8SKurt Hackel static void __dlm_get(struct dlm_ctxt *dlm)
3386714d8e8SKurt Hackel {
3396714d8e8SKurt Hackel kref_get(&dlm->dlm_refs);
3406714d8e8SKurt Hackel }
3416714d8e8SKurt Hackel
3426714d8e8SKurt Hackel /* given a questionable reference to a dlm object, gets a reference if
3436714d8e8SKurt Hackel * it can find it in the list, otherwise returns NULL in which case
3446714d8e8SKurt Hackel * you shouldn't trust your pointer. */
dlm_grab(struct dlm_ctxt * dlm)3456714d8e8SKurt Hackel struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm)
3466714d8e8SKurt Hackel {
347df53cd3bSDong Fang struct dlm_ctxt *target;
348df53cd3bSDong Fang struct dlm_ctxt *ret = NULL;
3496714d8e8SKurt Hackel
3506714d8e8SKurt Hackel spin_lock(&dlm_domain_lock);
3516714d8e8SKurt Hackel
352df53cd3bSDong Fang list_for_each_entry(target, &dlm_domains, list) {
3536714d8e8SKurt Hackel if (target == dlm) {
3546714d8e8SKurt Hackel __dlm_get(target);
355df53cd3bSDong Fang ret = target;
3566714d8e8SKurt Hackel break;
3576714d8e8SKurt Hackel }
3586714d8e8SKurt Hackel }
3596714d8e8SKurt Hackel
3606714d8e8SKurt Hackel spin_unlock(&dlm_domain_lock);
3616714d8e8SKurt Hackel
362df53cd3bSDong Fang return ret;
3636714d8e8SKurt Hackel }
3646714d8e8SKurt Hackel
dlm_domain_fully_joined(struct dlm_ctxt * dlm)3656714d8e8SKurt Hackel int dlm_domain_fully_joined(struct dlm_ctxt *dlm)
3666714d8e8SKurt Hackel {
3676714d8e8SKurt Hackel int ret;
3686714d8e8SKurt Hackel
3696714d8e8SKurt Hackel spin_lock(&dlm_domain_lock);
3706714d8e8SKurt Hackel ret = (dlm->dlm_state == DLM_CTXT_JOINED) ||
3716714d8e8SKurt Hackel (dlm->dlm_state == DLM_CTXT_IN_SHUTDOWN);
3726714d8e8SKurt Hackel spin_unlock(&dlm_domain_lock);
3736714d8e8SKurt Hackel
3746714d8e8SKurt Hackel return ret;
3756714d8e8SKurt Hackel }
3766714d8e8SKurt Hackel
dlm_destroy_dlm_worker(struct dlm_ctxt * dlm)3773156d267SKurt Hackel static void dlm_destroy_dlm_worker(struct dlm_ctxt *dlm)
3783156d267SKurt Hackel {
3793156d267SKurt Hackel if (dlm->dlm_worker) {
3803156d267SKurt Hackel destroy_workqueue(dlm->dlm_worker);
3813156d267SKurt Hackel dlm->dlm_worker = NULL;
3823156d267SKurt Hackel }
3833156d267SKurt Hackel }
3843156d267SKurt Hackel
dlm_complete_dlm_shutdown(struct dlm_ctxt * dlm)3856714d8e8SKurt Hackel static void dlm_complete_dlm_shutdown(struct dlm_ctxt *dlm)
3866714d8e8SKurt Hackel {
3876714d8e8SKurt Hackel dlm_unregister_domain_handlers(dlm);
3886714d8e8SKurt Hackel dlm_complete_thread(dlm);
3896714d8e8SKurt Hackel dlm_complete_recovery_thread(dlm);
3903156d267SKurt Hackel dlm_destroy_dlm_worker(dlm);
3916714d8e8SKurt Hackel
3926714d8e8SKurt Hackel /* We've left the domain. Now we can take ourselves out of the
3936714d8e8SKurt Hackel * list and allow the kref stuff to help us free the
3946714d8e8SKurt Hackel * memory. */
3956714d8e8SKurt Hackel spin_lock(&dlm_domain_lock);
3966714d8e8SKurt Hackel list_del_init(&dlm->list);
3976714d8e8SKurt Hackel spin_unlock(&dlm_domain_lock);
3986714d8e8SKurt Hackel
3996714d8e8SKurt Hackel /* Wake up anyone waiting for us to remove this domain */
4006714d8e8SKurt Hackel wake_up(&dlm_domain_events);
4016714d8e8SKurt Hackel }
4026714d8e8SKurt Hackel
dlm_migrate_all_locks(struct dlm_ctxt * dlm)403ba2bf218SKurt Hackel static int dlm_migrate_all_locks(struct dlm_ctxt *dlm)
4046714d8e8SKurt Hackel {
405ba2bf218SKurt Hackel int i, num, n, ret = 0;
4066714d8e8SKurt Hackel struct dlm_lock_resource *res;
407ba2bf218SKurt Hackel struct hlist_node *iter;
408ba2bf218SKurt Hackel struct hlist_head *bucket;
409ba2bf218SKurt Hackel int dropped;
4106714d8e8SKurt Hackel
4116714d8e8SKurt Hackel mlog(0, "Migrating locks from domain %s\n", dlm->name);
412ba2bf218SKurt Hackel
413ba2bf218SKurt Hackel num = 0;
4146714d8e8SKurt Hackel spin_lock(&dlm->spinlock);
41581f2094aSMark Fasheh for (i = 0; i < DLM_HASH_BUCKETS; i++) {
416ba2bf218SKurt Hackel redo_bucket:
417ba2bf218SKurt Hackel n = 0;
418ba2bf218SKurt Hackel bucket = dlm_lockres_hash(dlm, i);
419ba2bf218SKurt Hackel iter = bucket->first;
420ba2bf218SKurt Hackel while (iter) {
421ba2bf218SKurt Hackel n++;
422ba2bf218SKurt Hackel res = hlist_entry(iter, struct dlm_lock_resource,
423ba2bf218SKurt Hackel hash_node);
4246714d8e8SKurt Hackel dlm_lockres_get(res);
425ba2bf218SKurt Hackel /* migrate, if necessary. this will drop the dlm
426ba2bf218SKurt Hackel * spinlock and retake it if it does migration. */
427ba2bf218SKurt Hackel dropped = dlm_empty_lockres(dlm, res);
4286714d8e8SKurt Hackel
429ba2bf218SKurt Hackel spin_lock(&res->spinlock);
43066effd3cSSunil Mushran if (dropped)
431ba2bf218SKurt Hackel __dlm_lockres_calc_usage(dlm, res);
43266effd3cSSunil Mushran else
433ba2bf218SKurt Hackel iter = res->hash_node.next;
434ba2bf218SKurt Hackel spin_unlock(&res->spinlock);
435ba2bf218SKurt Hackel
4366714d8e8SKurt Hackel dlm_lockres_put(res);
437ba2bf218SKurt Hackel
43866effd3cSSunil Mushran if (dropped) {
43966effd3cSSunil Mushran cond_resched_lock(&dlm->spinlock);
440ba2bf218SKurt Hackel goto redo_bucket;
4416714d8e8SKurt Hackel }
44266effd3cSSunil Mushran }
4430d01af6eSSunil Mushran cond_resched_lock(&dlm->spinlock);
444ba2bf218SKurt Hackel num += n;
4456714d8e8SKurt Hackel }
44660c7ec9eSpiaojun
44760c7ec9eSpiaojun if (!num) {
44860c7ec9eSpiaojun if (dlm->reco.state & DLM_RECO_STATE_ACTIVE) {
44960c7ec9eSpiaojun mlog(0, "%s: perhaps there are more lock resources "
45060c7ec9eSpiaojun "need to be migrated after dlm recovery\n", dlm->name);
45160c7ec9eSpiaojun ret = -EAGAIN;
45260c7ec9eSpiaojun } else {
45360c7ec9eSpiaojun mlog(0, "%s: we won't do dlm recovery after migrating "
45460c7ec9eSpiaojun "all lock resources\n", dlm->name);
45560c7ec9eSpiaojun dlm->migrate_done = 1;
45660c7ec9eSpiaojun }
45760c7ec9eSpiaojun }
45860c7ec9eSpiaojun
4596714d8e8SKurt Hackel spin_unlock(&dlm->spinlock);
460ba2bf218SKurt Hackel wake_up(&dlm->dlm_thread_wq);
4616714d8e8SKurt Hackel
462ba2bf218SKurt Hackel /* let the dlm thread take care of purging, keep scanning until
463ba2bf218SKurt Hackel * nothing remains in the hash */
464ba2bf218SKurt Hackel if (num) {
465ba2bf218SKurt Hackel mlog(0, "%s: %d lock resources in hash last pass\n",
466ba2bf218SKurt Hackel dlm->name, num);
467ba2bf218SKurt Hackel ret = -EAGAIN;
468ba2bf218SKurt Hackel }
4696714d8e8SKurt Hackel mlog(0, "DONE Migrating locks from domain %s\n", dlm->name);
470ba2bf218SKurt Hackel return ret;
4716714d8e8SKurt Hackel }
4726714d8e8SKurt Hackel
dlm_no_joining_node(struct dlm_ctxt * dlm)4736714d8e8SKurt Hackel static int dlm_no_joining_node(struct dlm_ctxt *dlm)
4746714d8e8SKurt Hackel {
4756714d8e8SKurt Hackel int ret;
4766714d8e8SKurt Hackel
4776714d8e8SKurt Hackel spin_lock(&dlm->spinlock);
4786714d8e8SKurt Hackel ret = dlm->joining_node == DLM_LOCK_RES_OWNER_UNKNOWN;
4796714d8e8SKurt Hackel spin_unlock(&dlm->spinlock);
4806714d8e8SKurt Hackel
4816714d8e8SKurt Hackel return ret;
4826714d8e8SKurt Hackel }
4836714d8e8SKurt Hackel
dlm_begin_exit_domain_handler(struct o2net_msg * msg,u32 len,void * data,void ** ret_data)484bddefdeeSSunil Mushran static int dlm_begin_exit_domain_handler(struct o2net_msg *msg, u32 len,
485bddefdeeSSunil Mushran void *data, void **ret_data)
486bddefdeeSSunil Mushran {
487bddefdeeSSunil Mushran struct dlm_ctxt *dlm = data;
488bddefdeeSSunil Mushran unsigned int node;
489bddefdeeSSunil Mushran struct dlm_exit_domain *exit_msg = (struct dlm_exit_domain *) msg->buf;
490bddefdeeSSunil Mushran
491bddefdeeSSunil Mushran if (!dlm_grab(dlm))
492bddefdeeSSunil Mushran return 0;
493bddefdeeSSunil Mushran
494bddefdeeSSunil Mushran node = exit_msg->node_idx;
495bddefdeeSSunil Mushran mlog(0, "%s: Node %u sent a begin exit domain message\n", dlm->name, node);
496bddefdeeSSunil Mushran
497bddefdeeSSunil Mushran spin_lock(&dlm->spinlock);
498bddefdeeSSunil Mushran set_bit(node, dlm->exit_domain_map);
499bddefdeeSSunil Mushran spin_unlock(&dlm->spinlock);
500bddefdeeSSunil Mushran
501bddefdeeSSunil Mushran dlm_put(dlm);
502bddefdeeSSunil Mushran
503bddefdeeSSunil Mushran return 0;
504bddefdeeSSunil Mushran }
505bddefdeeSSunil Mushran
dlm_mark_domain_leaving(struct dlm_ctxt * dlm)5066714d8e8SKurt Hackel static void dlm_mark_domain_leaving(struct dlm_ctxt *dlm)
5076714d8e8SKurt Hackel {
5086714d8e8SKurt Hackel /* Yikes, a double spinlock! I need domain_lock for the dlm
5096714d8e8SKurt Hackel * state and the dlm spinlock for join state... Sorry! */
5106714d8e8SKurt Hackel again:
5116714d8e8SKurt Hackel spin_lock(&dlm_domain_lock);
5126714d8e8SKurt Hackel spin_lock(&dlm->spinlock);
5136714d8e8SKurt Hackel
5146714d8e8SKurt Hackel if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) {
5156714d8e8SKurt Hackel mlog(0, "Node %d is joining, we wait on it.\n",
5166714d8e8SKurt Hackel dlm->joining_node);
5176714d8e8SKurt Hackel spin_unlock(&dlm->spinlock);
5186714d8e8SKurt Hackel spin_unlock(&dlm_domain_lock);
5196714d8e8SKurt Hackel
5206714d8e8SKurt Hackel wait_event(dlm->dlm_join_events, dlm_no_joining_node(dlm));
5216714d8e8SKurt Hackel goto again;
5226714d8e8SKurt Hackel }
5236714d8e8SKurt Hackel
5246714d8e8SKurt Hackel dlm->dlm_state = DLM_CTXT_LEAVING;
5256714d8e8SKurt Hackel spin_unlock(&dlm->spinlock);
5266714d8e8SKurt Hackel spin_unlock(&dlm_domain_lock);
5276714d8e8SKurt Hackel }
5286714d8e8SKurt Hackel
__dlm_print_nodes(struct dlm_ctxt * dlm)5296714d8e8SKurt Hackel static void __dlm_print_nodes(struct dlm_ctxt *dlm)
5306714d8e8SKurt Hackel {
5318decab3cSSunil Mushran int node = -1, num = 0;
5326714d8e8SKurt Hackel
5336714d8e8SKurt Hackel assert_spin_locked(&dlm->spinlock);
5346714d8e8SKurt Hackel
5358decab3cSSunil Mushran printk("( ");
5366714d8e8SKurt Hackel while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES,
5376714d8e8SKurt Hackel node + 1)) < O2NM_MAX_NODES) {
538781ee3e2SSunil Mushran printk("%d ", node);
5398decab3cSSunil Mushran ++num;
5406714d8e8SKurt Hackel }
5418decab3cSSunil Mushran printk(") %u nodes\n", num);
5426714d8e8SKurt Hackel }
5436714d8e8SKurt Hackel
dlm_exit_domain_handler(struct o2net_msg * msg,u32 len,void * data,void ** ret_data)544d74c9803SKurt Hackel static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data,
545d74c9803SKurt Hackel void **ret_data)
5466714d8e8SKurt Hackel {
5476714d8e8SKurt Hackel struct dlm_ctxt *dlm = data;
5486714d8e8SKurt Hackel unsigned int node;
5496714d8e8SKurt Hackel struct dlm_exit_domain *exit_msg = (struct dlm_exit_domain *) msg->buf;
5506714d8e8SKurt Hackel
551ef6b689bSTao Ma mlog(0, "%p %u %p", msg, len, data);
5526714d8e8SKurt Hackel
5536714d8e8SKurt Hackel if (!dlm_grab(dlm))
5546714d8e8SKurt Hackel return 0;
5556714d8e8SKurt Hackel
5566714d8e8SKurt Hackel node = exit_msg->node_idx;
5576714d8e8SKurt Hackel
5586714d8e8SKurt Hackel spin_lock(&dlm->spinlock);
5596714d8e8SKurt Hackel clear_bit(node, dlm->domain_map);
560bddefdeeSSunil Mushran clear_bit(node, dlm->exit_domain_map);
5618decab3cSSunil Mushran printk(KERN_NOTICE "o2dlm: Node %u leaves domain %s ", node, dlm->name);
5626714d8e8SKurt Hackel __dlm_print_nodes(dlm);
5636714d8e8SKurt Hackel
5646714d8e8SKurt Hackel /* notify anything attached to the heartbeat events */
5656714d8e8SKurt Hackel dlm_hb_event_notify_attached(dlm, node, 0);
5666714d8e8SKurt Hackel
5676714d8e8SKurt Hackel spin_unlock(&dlm->spinlock);
5686714d8e8SKurt Hackel
5696714d8e8SKurt Hackel dlm_put(dlm);
5706714d8e8SKurt Hackel
5716714d8e8SKurt Hackel return 0;
5726714d8e8SKurt Hackel }
5736714d8e8SKurt Hackel
dlm_send_one_domain_exit(struct dlm_ctxt * dlm,u32 msg_type,unsigned int node)574bddefdeeSSunil Mushran static int dlm_send_one_domain_exit(struct dlm_ctxt *dlm, u32 msg_type,
5756714d8e8SKurt Hackel unsigned int node)
5766714d8e8SKurt Hackel {
5776714d8e8SKurt Hackel int status;
5786714d8e8SKurt Hackel struct dlm_exit_domain leave_msg;
5796714d8e8SKurt Hackel
580bddefdeeSSunil Mushran mlog(0, "%s: Sending domain exit message %u to node %u\n", dlm->name,
581bddefdeeSSunil Mushran msg_type, node);
5826714d8e8SKurt Hackel
5836714d8e8SKurt Hackel memset(&leave_msg, 0, sizeof(leave_msg));
5846714d8e8SKurt Hackel leave_msg.node_idx = dlm->node_num;
5856714d8e8SKurt Hackel
586bddefdeeSSunil Mushran status = o2net_send_message(msg_type, dlm->key, &leave_msg,
587bddefdeeSSunil Mushran sizeof(leave_msg), node, NULL);
588a5196ec5SWengang Wang if (status < 0)
589bddefdeeSSunil Mushran mlog(ML_ERROR, "Error %d sending domain exit message %u "
590bddefdeeSSunil Mushran "to node %u on domain %s\n", status, msg_type, node,
591bddefdeeSSunil Mushran dlm->name);
5926714d8e8SKurt Hackel
5936714d8e8SKurt Hackel return status;
5946714d8e8SKurt Hackel }
5956714d8e8SKurt Hackel
dlm_begin_exit_domain(struct dlm_ctxt * dlm)596bddefdeeSSunil Mushran static void dlm_begin_exit_domain(struct dlm_ctxt *dlm)
597bddefdeeSSunil Mushran {
598bddefdeeSSunil Mushran int node = -1;
599bddefdeeSSunil Mushran
600bddefdeeSSunil Mushran /* Support for begin exit domain was added in 1.2 */
601bddefdeeSSunil Mushran if (dlm->dlm_locking_proto.pv_major == 1 &&
602bddefdeeSSunil Mushran dlm->dlm_locking_proto.pv_minor < 2)
603bddefdeeSSunil Mushran return;
604bddefdeeSSunil Mushran
605bddefdeeSSunil Mushran /*
606bddefdeeSSunil Mushran * Unlike DLM_EXIT_DOMAIN_MSG, DLM_BEGIN_EXIT_DOMAIN_MSG is purely
607bddefdeeSSunil Mushran * informational. Meaning if a node does not receive the message,
608bddefdeeSSunil Mushran * so be it.
609bddefdeeSSunil Mushran */
610bddefdeeSSunil Mushran spin_lock(&dlm->spinlock);
611bddefdeeSSunil Mushran while (1) {
612bddefdeeSSunil Mushran node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES, node + 1);
613bddefdeeSSunil Mushran if (node >= O2NM_MAX_NODES)
614bddefdeeSSunil Mushran break;
615bddefdeeSSunil Mushran if (node == dlm->node_num)
616bddefdeeSSunil Mushran continue;
617bddefdeeSSunil Mushran
618bddefdeeSSunil Mushran spin_unlock(&dlm->spinlock);
619bddefdeeSSunil Mushran dlm_send_one_domain_exit(dlm, DLM_BEGIN_EXIT_DOMAIN_MSG, node);
620bddefdeeSSunil Mushran spin_lock(&dlm->spinlock);
621bddefdeeSSunil Mushran }
622bddefdeeSSunil Mushran spin_unlock(&dlm->spinlock);
623bddefdeeSSunil Mushran }
6246714d8e8SKurt Hackel
dlm_leave_domain(struct dlm_ctxt * dlm)6256714d8e8SKurt Hackel static void dlm_leave_domain(struct dlm_ctxt *dlm)
6266714d8e8SKurt Hackel {
6276714d8e8SKurt Hackel int node, clear_node, status;
6286714d8e8SKurt Hackel
6296714d8e8SKurt Hackel /* At this point we've migrated away all our locks and won't
6306714d8e8SKurt Hackel * accept mastership of new ones. The dlm is responsible for
6316714d8e8SKurt Hackel * almost nothing now. We make sure not to confuse any joining
6326714d8e8SKurt Hackel * nodes and then commence shutdown procedure. */
6336714d8e8SKurt Hackel
6346714d8e8SKurt Hackel spin_lock(&dlm->spinlock);
6356714d8e8SKurt Hackel /* Clear ourselves from the domain map */
6366714d8e8SKurt Hackel clear_bit(dlm->node_num, dlm->domain_map);
6376714d8e8SKurt Hackel while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES,
6386714d8e8SKurt Hackel 0)) < O2NM_MAX_NODES) {
6396714d8e8SKurt Hackel /* Drop the dlm spinlock. This is safe wrt the domain_map.
6406714d8e8SKurt Hackel * -nodes cannot be added now as the
6416714d8e8SKurt Hackel * query_join_handlers knows to respond with OK_NO_MAP
6426714d8e8SKurt Hackel * -we catch the right network errors if a node is
6436714d8e8SKurt Hackel * removed from the map while we're sending him the
6446714d8e8SKurt Hackel * exit message. */
6456714d8e8SKurt Hackel spin_unlock(&dlm->spinlock);
6466714d8e8SKurt Hackel
6476714d8e8SKurt Hackel clear_node = 1;
6486714d8e8SKurt Hackel
649bddefdeeSSunil Mushran status = dlm_send_one_domain_exit(dlm, DLM_EXIT_DOMAIN_MSG,
650bddefdeeSSunil Mushran node);
6516714d8e8SKurt Hackel if (status < 0 &&
6526714d8e8SKurt Hackel status != -ENOPROTOOPT &&
6536714d8e8SKurt Hackel status != -ENOTCONN) {
6546714d8e8SKurt Hackel mlog(ML_NOTICE, "Error %d sending domain exit message "
6556714d8e8SKurt Hackel "to node %d\n", status, node);
6566714d8e8SKurt Hackel
6576714d8e8SKurt Hackel /* Not sure what to do here but lets sleep for
6586714d8e8SKurt Hackel * a bit in case this was a transient
6596714d8e8SKurt Hackel * error... */
6606714d8e8SKurt Hackel msleep(DLM_DOMAIN_BACKOFF_MS);
6616714d8e8SKurt Hackel clear_node = 0;
6626714d8e8SKurt Hackel }
6636714d8e8SKurt Hackel
6646714d8e8SKurt Hackel spin_lock(&dlm->spinlock);
6656714d8e8SKurt Hackel /* If we're not clearing the node bit then we intend
6666714d8e8SKurt Hackel * to loop back around to try again. */
6676714d8e8SKurt Hackel if (clear_node)
6686714d8e8SKurt Hackel clear_bit(node, dlm->domain_map);
6696714d8e8SKurt Hackel }
6706714d8e8SKurt Hackel spin_unlock(&dlm->spinlock);
6716714d8e8SKurt Hackel }
6726714d8e8SKurt Hackel
dlm_unregister_domain(struct dlm_ctxt * dlm)6736714d8e8SKurt Hackel void dlm_unregister_domain(struct dlm_ctxt *dlm)
6746714d8e8SKurt Hackel {
6756714d8e8SKurt Hackel int leave = 0;
67629576f8bSSunil Mushran struct dlm_lock_resource *res;
6776714d8e8SKurt Hackel
6786714d8e8SKurt Hackel spin_lock(&dlm_domain_lock);
6796714d8e8SKurt Hackel BUG_ON(dlm->dlm_state != DLM_CTXT_JOINED);
6806714d8e8SKurt Hackel BUG_ON(!dlm->num_joins);
6816714d8e8SKurt Hackel
6826714d8e8SKurt Hackel dlm->num_joins--;
6836714d8e8SKurt Hackel if (!dlm->num_joins) {
6846714d8e8SKurt Hackel /* We mark it "in shutdown" now so new register
6856714d8e8SKurt Hackel * requests wait until we've completely left the
6866714d8e8SKurt Hackel * domain. Don't use DLM_CTXT_LEAVING yet as we still
6876714d8e8SKurt Hackel * want new domain joins to communicate with us at
6886714d8e8SKurt Hackel * least until we've completed migration of our
6896714d8e8SKurt Hackel * resources. */
6906714d8e8SKurt Hackel dlm->dlm_state = DLM_CTXT_IN_SHUTDOWN;
6916714d8e8SKurt Hackel leave = 1;
6926714d8e8SKurt Hackel }
6936714d8e8SKurt Hackel spin_unlock(&dlm_domain_lock);
6946714d8e8SKurt Hackel
6956714d8e8SKurt Hackel if (leave) {
6966714d8e8SKurt Hackel mlog(0, "shutting down domain %s\n", dlm->name);
697bddefdeeSSunil Mushran dlm_begin_exit_domain(dlm);
6986714d8e8SKurt Hackel
6996714d8e8SKurt Hackel /* We changed dlm state, notify the thread */
7006714d8e8SKurt Hackel dlm_kick_thread(dlm, NULL);
7016714d8e8SKurt Hackel
702ba2bf218SKurt Hackel while (dlm_migrate_all_locks(dlm)) {
7032f5bf1f2SSunil Mushran /* Give dlm_thread time to purge the lockres' */
7042f5bf1f2SSunil Mushran msleep(500);
705ba2bf218SKurt Hackel mlog(0, "%s: more migration to do\n", dlm->name);
706ba2bf218SKurt Hackel }
70729576f8bSSunil Mushran
70829576f8bSSunil Mushran /* This list should be empty. If not, print remaining lockres */
70929576f8bSSunil Mushran if (!list_empty(&dlm->tracking_list)) {
71029576f8bSSunil Mushran mlog(ML_ERROR, "Following lockres' are still on the "
71129576f8bSSunil Mushran "tracking list:\n");
71229576f8bSSunil Mushran list_for_each_entry(res, &dlm->tracking_list, tracking)
71329576f8bSSunil Mushran dlm_print_one_lock_resource(res);
71429576f8bSSunil Mushran }
71529576f8bSSunil Mushran
7166714d8e8SKurt Hackel dlm_mark_domain_leaving(dlm);
7176714d8e8SKurt Hackel dlm_leave_domain(dlm);
7188decab3cSSunil Mushran printk(KERN_NOTICE "o2dlm: Leaving domain %s\n", dlm->name);
7195dad6c39SSrinivas Eeda dlm_force_free_mles(dlm);
7206714d8e8SKurt Hackel dlm_complete_dlm_shutdown(dlm);
7216714d8e8SKurt Hackel }
7226714d8e8SKurt Hackel dlm_put(dlm);
7236714d8e8SKurt Hackel }
7246714d8e8SKurt Hackel EXPORT_SYMBOL_GPL(dlm_unregister_domain);
7256714d8e8SKurt Hackel
dlm_query_join_proto_check(char * proto_type,int node,struct dlm_protocol_version * ours,struct dlm_protocol_version * request)726d24fbcdaSJoel Becker static int dlm_query_join_proto_check(char *proto_type, int node,
727d24fbcdaSJoel Becker struct dlm_protocol_version *ours,
728d24fbcdaSJoel Becker struct dlm_protocol_version *request)
729d24fbcdaSJoel Becker {
730d24fbcdaSJoel Becker int rc;
731d24fbcdaSJoel Becker struct dlm_protocol_version proto = *request;
732d24fbcdaSJoel Becker
733d24fbcdaSJoel Becker if (!dlm_protocol_compare(ours, &proto)) {
734d24fbcdaSJoel Becker mlog(0,
735d24fbcdaSJoel Becker "node %u wanted to join with %s locking protocol "
736d24fbcdaSJoel Becker "%u.%u, we respond with %u.%u\n",
737d24fbcdaSJoel Becker node, proto_type,
738d24fbcdaSJoel Becker request->pv_major,
739d24fbcdaSJoel Becker request->pv_minor,
740d24fbcdaSJoel Becker proto.pv_major, proto.pv_minor);
741d24fbcdaSJoel Becker request->pv_minor = proto.pv_minor;
742d24fbcdaSJoel Becker rc = 0;
743d24fbcdaSJoel Becker } else {
744d24fbcdaSJoel Becker mlog(ML_NOTICE,
745d24fbcdaSJoel Becker "Node %u wanted to join with %s locking "
746d24fbcdaSJoel Becker "protocol %u.%u, but we have %u.%u, disallowing\n",
747d24fbcdaSJoel Becker node, proto_type,
748d24fbcdaSJoel Becker request->pv_major,
749d24fbcdaSJoel Becker request->pv_minor,
750d24fbcdaSJoel Becker ours->pv_major,
751d24fbcdaSJoel Becker ours->pv_minor);
752d24fbcdaSJoel Becker rc = 1;
753d24fbcdaSJoel Becker }
754d24fbcdaSJoel Becker
755d24fbcdaSJoel Becker return rc;
756d24fbcdaSJoel Becker }
757d24fbcdaSJoel Becker
7580f71b7b4SJoel Becker /*
7590f71b7b4SJoel Becker * struct dlm_query_join_packet is made up of four one-byte fields. They
7600f71b7b4SJoel Becker * are effectively in big-endian order already. However, little-endian
7610f71b7b4SJoel Becker * machines swap them before putting the packet on the wire (because
7620f71b7b4SJoel Becker * query_join's response is a status, and that status is treated as a u32
7630f71b7b4SJoel Becker * on the wire). Thus, a big-endian and little-endian machines will treat
7640f71b7b4SJoel Becker * this structure differently.
7650f71b7b4SJoel Becker *
7660f71b7b4SJoel Becker * The solution is to have little-endian machines swap the structure when
7670f71b7b4SJoel Becker * converting from the structure to the u32 representation. This will
7680f71b7b4SJoel Becker * result in the structure having the correct format on the wire no matter
7690f71b7b4SJoel Becker * the host endian format.
7700f71b7b4SJoel Becker */
dlm_query_join_packet_to_wire(struct dlm_query_join_packet * packet,u32 * wire)7710f71b7b4SJoel Becker static void dlm_query_join_packet_to_wire(struct dlm_query_join_packet *packet,
7720f71b7b4SJoel Becker u32 *wire)
7730f71b7b4SJoel Becker {
7740f71b7b4SJoel Becker union dlm_query_join_response response;
7750f71b7b4SJoel Becker
7760f71b7b4SJoel Becker response.packet = *packet;
77785158410SAl Viro *wire = be32_to_cpu(response.intval);
7780f71b7b4SJoel Becker }
7790f71b7b4SJoel Becker
dlm_query_join_wire_to_packet(u32 wire,struct dlm_query_join_packet * packet)7800f71b7b4SJoel Becker static void dlm_query_join_wire_to_packet(u32 wire,
7810f71b7b4SJoel Becker struct dlm_query_join_packet *packet)
7820f71b7b4SJoel Becker {
7830f71b7b4SJoel Becker union dlm_query_join_response response;
7840f71b7b4SJoel Becker
7850f71b7b4SJoel Becker response.intval = cpu_to_be32(wire);
7860f71b7b4SJoel Becker *packet = response.packet;
7870f71b7b4SJoel Becker }
7880f71b7b4SJoel Becker
dlm_query_join_handler(struct o2net_msg * msg,u32 len,void * data,void ** ret_data)789d74c9803SKurt Hackel static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data,
790d74c9803SKurt Hackel void **ret_data)
7916714d8e8SKurt Hackel {
7926714d8e8SKurt Hackel struct dlm_query_join_request *query;
7930f71b7b4SJoel Becker struct dlm_query_join_packet packet = {
7940f71b7b4SJoel Becker .code = JOIN_DISALLOW,
795d24fbcdaSJoel Becker };
7966714d8e8SKurt Hackel struct dlm_ctxt *dlm = NULL;
7970f71b7b4SJoel Becker u32 response;
7981faf2894SSrinivas Eeda u8 nodenum;
7996714d8e8SKurt Hackel
8006714d8e8SKurt Hackel query = (struct dlm_query_join_request *) msg->buf;
8016714d8e8SKurt Hackel
8026714d8e8SKurt Hackel mlog(0, "node %u wants to join domain %s\n", query->node_idx,
8036714d8e8SKurt Hackel query->domain);
8046714d8e8SKurt Hackel
8056714d8e8SKurt Hackel /*
8066714d8e8SKurt Hackel * If heartbeat doesn't consider the node live, tell it
8076714d8e8SKurt Hackel * to back off and try again. This gives heartbeat a chance
8086714d8e8SKurt Hackel * to catch up.
8096714d8e8SKurt Hackel */
81070e82a12SJoseph Qi if (!o2hb_check_node_heartbeating_no_sem(query->node_idx)) {
8116714d8e8SKurt Hackel mlog(0, "node %u is not in our live map yet\n",
8126714d8e8SKurt Hackel query->node_idx);
8136714d8e8SKurt Hackel
8140f71b7b4SJoel Becker packet.code = JOIN_DISALLOW;
8156714d8e8SKurt Hackel goto respond;
8166714d8e8SKurt Hackel }
8176714d8e8SKurt Hackel
8180f71b7b4SJoel Becker packet.code = JOIN_OK_NO_MAP;
8196714d8e8SKurt Hackel
8206714d8e8SKurt Hackel spin_lock(&dlm_domain_lock);
8216714d8e8SKurt Hackel dlm = __dlm_lookup_domain_full(query->domain, query->name_len);
8221faf2894SSrinivas Eeda if (!dlm)
8231faf2894SSrinivas Eeda goto unlock_respond;
8241faf2894SSrinivas Eeda
8251faf2894SSrinivas Eeda /*
8261faf2894SSrinivas Eeda * There is a small window where the joining node may not see the
8271faf2894SSrinivas Eeda * node(s) that just left but still part of the cluster. DISALLOW
8281faf2894SSrinivas Eeda * join request if joining node has different node map.
8291faf2894SSrinivas Eeda */
8301faf2894SSrinivas Eeda nodenum=0;
8311faf2894SSrinivas Eeda while (nodenum < O2NM_MAX_NODES) {
8321faf2894SSrinivas Eeda if (test_bit(nodenum, dlm->domain_map)) {
8331faf2894SSrinivas Eeda if (!byte_test_bit(nodenum, query->node_map)) {
834e4968476SSunil Mushran mlog(0, "disallow join as node %u does not "
835e4968476SSunil Mushran "have node %u in its nodemap\n",
836e4968476SSunil Mushran query->node_idx, nodenum);
8370f71b7b4SJoel Becker packet.code = JOIN_DISALLOW;
8381faf2894SSrinivas Eeda goto unlock_respond;
8391faf2894SSrinivas Eeda }
8401faf2894SSrinivas Eeda }
8411faf2894SSrinivas Eeda nodenum++;
8421faf2894SSrinivas Eeda }
8431faf2894SSrinivas Eeda
8446714d8e8SKurt Hackel /* Once the dlm ctxt is marked as leaving then we don't want
845e2faea4cSKurt Hackel * to be put in someone's domain map.
846e2faea4cSKurt Hackel * Also, explicitly disallow joining at certain troublesome
847e2faea4cSKurt Hackel * times (ie. during recovery). */
848b3e3e5afSDan Carpenter if (dlm->dlm_state != DLM_CTXT_LEAVING) {
849e2faea4cSKurt Hackel int bit = query->node_idx;
8506714d8e8SKurt Hackel spin_lock(&dlm->spinlock);
8516714d8e8SKurt Hackel
8526714d8e8SKurt Hackel if (dlm->dlm_state == DLM_CTXT_NEW &&
8536714d8e8SKurt Hackel dlm->joining_node == DLM_LOCK_RES_OWNER_UNKNOWN) {
8546714d8e8SKurt Hackel /*If this is a brand new context and we
8556714d8e8SKurt Hackel * haven't started our join process yet, then
8566714d8e8SKurt Hackel * the other node won the race. */
8570f71b7b4SJoel Becker packet.code = JOIN_OK_NO_MAP;
8586714d8e8SKurt Hackel } else if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) {
8596714d8e8SKurt Hackel /* Disallow parallel joins. */
8600f71b7b4SJoel Becker packet.code = JOIN_DISALLOW;
861e2faea4cSKurt Hackel } else if (dlm->reco.state & DLM_RECO_STATE_ACTIVE) {
862e4968476SSunil Mushran mlog(0, "node %u trying to join, but recovery "
863e2faea4cSKurt Hackel "is ongoing.\n", bit);
8640f71b7b4SJoel Becker packet.code = JOIN_DISALLOW;
865e2faea4cSKurt Hackel } else if (test_bit(bit, dlm->recovery_map)) {
866e4968476SSunil Mushran mlog(0, "node %u trying to join, but it "
867e2faea4cSKurt Hackel "still needs recovery.\n", bit);
8680f71b7b4SJoel Becker packet.code = JOIN_DISALLOW;
869e2faea4cSKurt Hackel } else if (test_bit(bit, dlm->domain_map)) {
870e4968476SSunil Mushran mlog(0, "node %u trying to join, but it "
871e2faea4cSKurt Hackel "is still in the domain! needs recovery?\n",
872e2faea4cSKurt Hackel bit);
8730f71b7b4SJoel Becker packet.code = JOIN_DISALLOW;
8746714d8e8SKurt Hackel } else {
8756714d8e8SKurt Hackel /* Alright we're fully a part of this domain
8766714d8e8SKurt Hackel * so we keep some state as to who's joining
8776714d8e8SKurt Hackel * and indicate to him that needs to be fixed
8786714d8e8SKurt Hackel * up. */
879d24fbcdaSJoel Becker
880d24fbcdaSJoel Becker /* Make sure we speak compatible locking protocols. */
881d24fbcdaSJoel Becker if (dlm_query_join_proto_check("DLM", bit,
882d24fbcdaSJoel Becker &dlm->dlm_locking_proto,
883d24fbcdaSJoel Becker &query->dlm_proto)) {
8840f71b7b4SJoel Becker packet.code = JOIN_PROTOCOL_MISMATCH;
885d24fbcdaSJoel Becker } else if (dlm_query_join_proto_check("fs", bit,
886d24fbcdaSJoel Becker &dlm->fs_locking_proto,
887d24fbcdaSJoel Becker &query->fs_proto)) {
8880f71b7b4SJoel Becker packet.code = JOIN_PROTOCOL_MISMATCH;
889d24fbcdaSJoel Becker } else {
8900f71b7b4SJoel Becker packet.dlm_minor = query->dlm_proto.pv_minor;
8910f71b7b4SJoel Becker packet.fs_minor = query->fs_proto.pv_minor;
8920f71b7b4SJoel Becker packet.code = JOIN_OK;
8936714d8e8SKurt Hackel __dlm_set_joining_node(dlm, query->node_idx);
8946714d8e8SKurt Hackel }
895d24fbcdaSJoel Becker }
8966714d8e8SKurt Hackel
8976714d8e8SKurt Hackel spin_unlock(&dlm->spinlock);
8986714d8e8SKurt Hackel }
8991faf2894SSrinivas Eeda unlock_respond:
9006714d8e8SKurt Hackel spin_unlock(&dlm_domain_lock);
9016714d8e8SKurt Hackel
9026714d8e8SKurt Hackel respond:
9030f71b7b4SJoel Becker mlog(0, "We respond with %u\n", packet.code);
9046714d8e8SKurt Hackel
9050f71b7b4SJoel Becker dlm_query_join_packet_to_wire(&packet, &response);
9060f71b7b4SJoel Becker return response;
9076714d8e8SKurt Hackel }
9086714d8e8SKurt Hackel
dlm_assert_joined_handler(struct o2net_msg * msg,u32 len,void * data,void ** ret_data)909d74c9803SKurt Hackel static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data,
910d74c9803SKurt Hackel void **ret_data)
9116714d8e8SKurt Hackel {
9126714d8e8SKurt Hackel struct dlm_assert_joined *assert;
9136714d8e8SKurt Hackel struct dlm_ctxt *dlm = NULL;
9146714d8e8SKurt Hackel
9156714d8e8SKurt Hackel assert = (struct dlm_assert_joined *) msg->buf;
9166714d8e8SKurt Hackel
9176714d8e8SKurt Hackel mlog(0, "node %u asserts join on domain %s\n", assert->node_idx,
9186714d8e8SKurt Hackel assert->domain);
9196714d8e8SKurt Hackel
9206714d8e8SKurt Hackel spin_lock(&dlm_domain_lock);
9216714d8e8SKurt Hackel dlm = __dlm_lookup_domain_full(assert->domain, assert->name_len);
9226714d8e8SKurt Hackel /* XXX should we consider no dlm ctxt an error? */
9236714d8e8SKurt Hackel if (dlm) {
9246714d8e8SKurt Hackel spin_lock(&dlm->spinlock);
9256714d8e8SKurt Hackel
9266714d8e8SKurt Hackel /* Alright, this node has officially joined our
9276714d8e8SKurt Hackel * domain. Set him in the map and clean up our
9286714d8e8SKurt Hackel * leftover join state. */
9296714d8e8SKurt Hackel BUG_ON(dlm->joining_node != assert->node_idx);
93001c6222fSXue jiufei
93101c6222fSXue jiufei if (dlm->reco.state & DLM_RECO_STATE_ACTIVE) {
93201c6222fSXue jiufei mlog(0, "dlm recovery is ongoing, disallow join\n");
93301c6222fSXue jiufei spin_unlock(&dlm->spinlock);
93401c6222fSXue jiufei spin_unlock(&dlm_domain_lock);
93501c6222fSXue jiufei return -EAGAIN;
93601c6222fSXue jiufei }
93701c6222fSXue jiufei
9386714d8e8SKurt Hackel set_bit(assert->node_idx, dlm->domain_map);
939bddefdeeSSunil Mushran clear_bit(assert->node_idx, dlm->exit_domain_map);
9406714d8e8SKurt Hackel __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN);
9416714d8e8SKurt Hackel
9428decab3cSSunil Mushran printk(KERN_NOTICE "o2dlm: Node %u joins domain %s ",
943781ee3e2SSunil Mushran assert->node_idx, dlm->name);
9446714d8e8SKurt Hackel __dlm_print_nodes(dlm);
9456714d8e8SKurt Hackel
9466714d8e8SKurt Hackel /* notify anything attached to the heartbeat events */
9476714d8e8SKurt Hackel dlm_hb_event_notify_attached(dlm, assert->node_idx, 1);
9486714d8e8SKurt Hackel
9496714d8e8SKurt Hackel spin_unlock(&dlm->spinlock);
9506714d8e8SKurt Hackel }
9516714d8e8SKurt Hackel spin_unlock(&dlm_domain_lock);
9526714d8e8SKurt Hackel
9536714d8e8SKurt Hackel return 0;
9546714d8e8SKurt Hackel }
9556714d8e8SKurt Hackel
dlm_match_regions(struct dlm_ctxt * dlm,struct dlm_query_region * qr,char * local,int locallen)956ea203441SSunil Mushran static int dlm_match_regions(struct dlm_ctxt *dlm,
957770c4d81SSunil Mushran struct dlm_query_region *qr,
958770c4d81SSunil Mushran char *local, int locallen)
959ea203441SSunil Mushran {
960770c4d81SSunil Mushran char *remote = qr->qr_regions;
961ea203441SSunil Mushran char *l, *r;
962ea203441SSunil Mushran int localnr, i, j, foundit;
963ea203441SSunil Mushran int status = 0;
964ea203441SSunil Mushran
965ea203441SSunil Mushran if (!o2hb_global_heartbeat_active()) {
966ea203441SSunil Mushran if (qr->qr_numregions) {
967ea203441SSunil Mushran mlog(ML_ERROR, "Domain %s: Joining node %d has global "
968ea203441SSunil Mushran "heartbeat enabled but local node %d does not\n",
969ea203441SSunil Mushran qr->qr_domain, qr->qr_node, dlm->node_num);
970ea203441SSunil Mushran status = -EINVAL;
971ea203441SSunil Mushran }
972ea203441SSunil Mushran goto bail;
973ea203441SSunil Mushran }
974ea203441SSunil Mushran
975ea203441SSunil Mushran if (o2hb_global_heartbeat_active() && !qr->qr_numregions) {
976ea203441SSunil Mushran mlog(ML_ERROR, "Domain %s: Local node %d has global "
977ea203441SSunil Mushran "heartbeat enabled but joining node %d does not\n",
978ea203441SSunil Mushran qr->qr_domain, dlm->node_num, qr->qr_node);
979ea203441SSunil Mushran status = -EINVAL;
980ea203441SSunil Mushran goto bail;
981ea203441SSunil Mushran }
982ea203441SSunil Mushran
983ea203441SSunil Mushran r = remote;
984ea203441SSunil Mushran for (i = 0; i < qr->qr_numregions; ++i) {
985ea203441SSunil Mushran mlog(0, "Region %.*s\n", O2HB_MAX_REGION_NAME_LEN, r);
986ea203441SSunil Mushran r += O2HB_MAX_REGION_NAME_LEN;
987ea203441SSunil Mushran }
988ea203441SSunil Mushran
989770c4d81SSunil Mushran localnr = min(O2NM_MAX_REGIONS, locallen/O2HB_MAX_REGION_NAME_LEN);
990770c4d81SSunil Mushran localnr = o2hb_get_all_regions(local, (u8)localnr);
991ea203441SSunil Mushran
992ea203441SSunil Mushran /* compare local regions with remote */
993ea203441SSunil Mushran l = local;
994ea203441SSunil Mushran for (i = 0; i < localnr; ++i) {
995ea203441SSunil Mushran foundit = 0;
996ea203441SSunil Mushran r = remote;
997ea203441SSunil Mushran for (j = 0; j <= qr->qr_numregions; ++j) {
998ea203441SSunil Mushran if (!memcmp(l, r, O2HB_MAX_REGION_NAME_LEN)) {
999ea203441SSunil Mushran foundit = 1;
1000ea203441SSunil Mushran break;
1001ea203441SSunil Mushran }
1002ea203441SSunil Mushran r += O2HB_MAX_REGION_NAME_LEN;
1003ea203441SSunil Mushran }
1004ea203441SSunil Mushran if (!foundit) {
1005ea203441SSunil Mushran status = -EINVAL;
1006ea203441SSunil Mushran mlog(ML_ERROR, "Domain %s: Region '%.*s' registered "
1007ea203441SSunil Mushran "in local node %d but not in joining node %d\n",
1008ea203441SSunil Mushran qr->qr_domain, O2HB_MAX_REGION_NAME_LEN, l,
1009ea203441SSunil Mushran dlm->node_num, qr->qr_node);
1010ea203441SSunil Mushran goto bail;
1011ea203441SSunil Mushran }
1012ea203441SSunil Mushran l += O2HB_MAX_REGION_NAME_LEN;
1013ea203441SSunil Mushran }
1014ea203441SSunil Mushran
1015ea203441SSunil Mushran /* compare remote with local regions */
1016ea203441SSunil Mushran r = remote;
1017ea203441SSunil Mushran for (i = 0; i < qr->qr_numregions; ++i) {
1018ea203441SSunil Mushran foundit = 0;
1019ea203441SSunil Mushran l = local;
1020ea203441SSunil Mushran for (j = 0; j < localnr; ++j) {
1021ea203441SSunil Mushran if (!memcmp(r, l, O2HB_MAX_REGION_NAME_LEN)) {
1022ea203441SSunil Mushran foundit = 1;
1023ea203441SSunil Mushran break;
1024ea203441SSunil Mushran }
1025ea203441SSunil Mushran l += O2HB_MAX_REGION_NAME_LEN;
1026ea203441SSunil Mushran }
1027ea203441SSunil Mushran if (!foundit) {
1028ea203441SSunil Mushran status = -EINVAL;
1029ea203441SSunil Mushran mlog(ML_ERROR, "Domain %s: Region '%.*s' registered "
1030ea203441SSunil Mushran "in joining node %d but not in local node %d\n",
1031ea203441SSunil Mushran qr->qr_domain, O2HB_MAX_REGION_NAME_LEN, r,
1032ea203441SSunil Mushran qr->qr_node, dlm->node_num);
1033ea203441SSunil Mushran goto bail;
1034ea203441SSunil Mushran }
1035ea203441SSunil Mushran r += O2HB_MAX_REGION_NAME_LEN;
1036ea203441SSunil Mushran }
1037ea203441SSunil Mushran
1038ea203441SSunil Mushran bail:
1039ea203441SSunil Mushran return status;
1040ea203441SSunil Mushran }
1041ea203441SSunil Mushran
dlm_send_regions(struct dlm_ctxt * dlm,unsigned long * node_map)1042ea203441SSunil Mushran static int dlm_send_regions(struct dlm_ctxt *dlm, unsigned long *node_map)
1043ea203441SSunil Mushran {
1044ea203441SSunil Mushran struct dlm_query_region *qr = NULL;
1045ea203441SSunil Mushran int status, ret = 0, i;
1046ea203441SSunil Mushran char *p;
1047ea203441SSunil Mushran
1048b5c7e7ecSYury Norov if (find_first_bit(node_map, O2NM_MAX_NODES) >= O2NM_MAX_NODES)
1049ea203441SSunil Mushran goto bail;
1050ea203441SSunil Mushran
1051ea203441SSunil Mushran qr = kzalloc(sizeof(struct dlm_query_region), GFP_KERNEL);
1052ea203441SSunil Mushran if (!qr) {
1053ea203441SSunil Mushran ret = -ENOMEM;
1054ea203441SSunil Mushran mlog_errno(ret);
1055ea203441SSunil Mushran goto bail;
1056ea203441SSunil Mushran }
1057ea203441SSunil Mushran
1058ea203441SSunil Mushran qr->qr_node = dlm->node_num;
1059ea203441SSunil Mushran qr->qr_namelen = strlen(dlm->name);
1060ea203441SSunil Mushran memcpy(qr->qr_domain, dlm->name, qr->qr_namelen);
1061ea203441SSunil Mushran /* if local hb, the numregions will be zero */
1062ea203441SSunil Mushran if (o2hb_global_heartbeat_active())
1063ea203441SSunil Mushran qr->qr_numregions = o2hb_get_all_regions(qr->qr_regions,
1064ea203441SSunil Mushran O2NM_MAX_REGIONS);
1065ea203441SSunil Mushran
1066ea203441SSunil Mushran p = qr->qr_regions;
1067ea203441SSunil Mushran for (i = 0; i < qr->qr_numregions; ++i, p += O2HB_MAX_REGION_NAME_LEN)
1068ea203441SSunil Mushran mlog(0, "Region %.*s\n", O2HB_MAX_REGION_NAME_LEN, p);
1069ea203441SSunil Mushran
1070ea203441SSunil Mushran i = -1;
1071ea203441SSunil Mushran while ((i = find_next_bit(node_map, O2NM_MAX_NODES,
1072ea203441SSunil Mushran i + 1)) < O2NM_MAX_NODES) {
1073ea203441SSunil Mushran if (i == dlm->node_num)
1074ea203441SSunil Mushran continue;
1075ea203441SSunil Mushran
1076ea203441SSunil Mushran mlog(0, "Sending regions to node %d\n", i);
1077ea203441SSunil Mushran
1078ea203441SSunil Mushran ret = o2net_send_message(DLM_QUERY_REGION, DLM_MOD_KEY, qr,
1079ea203441SSunil Mushran sizeof(struct dlm_query_region),
1080ea203441SSunil Mushran i, &status);
1081ea203441SSunil Mushran if (ret >= 0)
1082ea203441SSunil Mushran ret = status;
1083ea203441SSunil Mushran if (ret) {
1084ea203441SSunil Mushran mlog(ML_ERROR, "Region mismatch %d, node %d\n",
1085ea203441SSunil Mushran ret, i);
1086ea203441SSunil Mushran break;
1087ea203441SSunil Mushran }
1088ea203441SSunil Mushran }
1089ea203441SSunil Mushran
1090ea203441SSunil Mushran bail:
1091ea203441SSunil Mushran kfree(qr);
1092ea203441SSunil Mushran return ret;
1093ea203441SSunil Mushran }
1094ea203441SSunil Mushran
dlm_query_region_handler(struct o2net_msg * msg,u32 len,void * data,void ** ret_data)1095ea203441SSunil Mushran static int dlm_query_region_handler(struct o2net_msg *msg, u32 len,
1096ea203441SSunil Mushran void *data, void **ret_data)
1097ea203441SSunil Mushran {
1098ea203441SSunil Mushran struct dlm_query_region *qr;
1099ea203441SSunil Mushran struct dlm_ctxt *dlm = NULL;
1100770c4d81SSunil Mushran char *local = NULL;
1101ea203441SSunil Mushran int status = 0;
1102ea203441SSunil Mushran
1103ea203441SSunil Mushran qr = (struct dlm_query_region *) msg->buf;
1104ea203441SSunil Mushran
1105ea203441SSunil Mushran mlog(0, "Node %u queries hb regions on domain %s\n", qr->qr_node,
1106ea203441SSunil Mushran qr->qr_domain);
1107ea203441SSunil Mushran
1108770c4d81SSunil Mushran /* buffer used in dlm_mast_regions() */
1109770c4d81SSunil Mushran local = kmalloc(sizeof(qr->qr_regions), GFP_KERNEL);
1110a35ad97cSZhonghua Guo if (!local)
1111a35ad97cSZhonghua Guo return -ENOMEM;
1112770c4d81SSunil Mushran
1113ea203441SSunil Mushran status = -EINVAL;
1114ea203441SSunil Mushran
1115ea203441SSunil Mushran spin_lock(&dlm_domain_lock);
1116ea203441SSunil Mushran dlm = __dlm_lookup_domain_full(qr->qr_domain, qr->qr_namelen);
1117ea203441SSunil Mushran if (!dlm) {
1118ea203441SSunil Mushran mlog(ML_ERROR, "Node %d queried hb regions on domain %s "
1119ea203441SSunil Mushran "before join domain\n", qr->qr_node, qr->qr_domain);
1120a35ad97cSZhonghua Guo goto out_domain_lock;
1121ea203441SSunil Mushran }
1122ea203441SSunil Mushran
1123ea203441SSunil Mushran spin_lock(&dlm->spinlock);
1124ea203441SSunil Mushran if (dlm->joining_node != qr->qr_node) {
1125ea203441SSunil Mushran mlog(ML_ERROR, "Node %d queried hb regions on domain %s "
1126ea203441SSunil Mushran "but joining node is %d\n", qr->qr_node, qr->qr_domain,
1127ea203441SSunil Mushran dlm->joining_node);
1128a35ad97cSZhonghua Guo goto out_dlm_lock;
1129ea203441SSunil Mushran }
1130ea203441SSunil Mushran
1131ea203441SSunil Mushran /* Support for global heartbeat was added in 1.1 */
1132ea203441SSunil Mushran if (dlm->dlm_locking_proto.pv_major == 1 &&
1133ea203441SSunil Mushran dlm->dlm_locking_proto.pv_minor == 0) {
1134ea203441SSunil Mushran mlog(ML_ERROR, "Node %d queried hb regions on domain %s "
1135ea203441SSunil Mushran "but active dlm protocol is %d.%d\n", qr->qr_node,
1136ea203441SSunil Mushran qr->qr_domain, dlm->dlm_locking_proto.pv_major,
1137ea203441SSunil Mushran dlm->dlm_locking_proto.pv_minor);
1138a35ad97cSZhonghua Guo goto out_dlm_lock;
1139ea203441SSunil Mushran }
1140ea203441SSunil Mushran
1141770c4d81SSunil Mushran status = dlm_match_regions(dlm, qr, local, sizeof(qr->qr_regions));
1142ea203441SSunil Mushran
1143a35ad97cSZhonghua Guo out_dlm_lock:
1144ea203441SSunil Mushran spin_unlock(&dlm->spinlock);
1145a35ad97cSZhonghua Guo
1146a35ad97cSZhonghua Guo out_domain_lock:
1147ea203441SSunil Mushran spin_unlock(&dlm_domain_lock);
1148ea203441SSunil Mushran
1149770c4d81SSunil Mushran kfree(local);
1150770c4d81SSunil Mushran
1151ea203441SSunil Mushran return status;
1152ea203441SSunil Mushran }
1153ea203441SSunil Mushran
dlm_match_nodes(struct dlm_ctxt * dlm,struct dlm_query_nodeinfo * qn)115418cfdf1bSSunil Mushran static int dlm_match_nodes(struct dlm_ctxt *dlm, struct dlm_query_nodeinfo *qn)
115518cfdf1bSSunil Mushran {
115618cfdf1bSSunil Mushran struct o2nm_node *local;
115718cfdf1bSSunil Mushran struct dlm_node_info *remote;
115818cfdf1bSSunil Mushran int i, j;
115918cfdf1bSSunil Mushran int status = 0;
116018cfdf1bSSunil Mushran
116118cfdf1bSSunil Mushran for (j = 0; j < qn->qn_numnodes; ++j)
116218cfdf1bSSunil Mushran mlog(0, "Node %3d, %pI4:%u\n", qn->qn_nodes[j].ni_nodenum,
116318cfdf1bSSunil Mushran &(qn->qn_nodes[j].ni_ipv4_address),
116418cfdf1bSSunil Mushran ntohs(qn->qn_nodes[j].ni_ipv4_port));
116518cfdf1bSSunil Mushran
116618cfdf1bSSunil Mushran for (i = 0; i < O2NM_MAX_NODES && !status; ++i) {
116718cfdf1bSSunil Mushran local = o2nm_get_node_by_num(i);
116818cfdf1bSSunil Mushran remote = NULL;
116918cfdf1bSSunil Mushran for (j = 0; j < qn->qn_numnodes; ++j) {
117018cfdf1bSSunil Mushran if (qn->qn_nodes[j].ni_nodenum == i) {
117118cfdf1bSSunil Mushran remote = &(qn->qn_nodes[j]);
117218cfdf1bSSunil Mushran break;
117318cfdf1bSSunil Mushran }
117418cfdf1bSSunil Mushran }
117518cfdf1bSSunil Mushran
117618cfdf1bSSunil Mushran if (!local && !remote)
117718cfdf1bSSunil Mushran continue;
117818cfdf1bSSunil Mushran
117918cfdf1bSSunil Mushran if ((local && !remote) || (!local && remote))
118018cfdf1bSSunil Mushran status = -EINVAL;
118118cfdf1bSSunil Mushran
118218cfdf1bSSunil Mushran if (!status &&
118318cfdf1bSSunil Mushran ((remote->ni_nodenum != local->nd_num) ||
118418cfdf1bSSunil Mushran (remote->ni_ipv4_port != local->nd_ipv4_port) ||
118518cfdf1bSSunil Mushran (remote->ni_ipv4_address != local->nd_ipv4_address)))
118618cfdf1bSSunil Mushran status = -EINVAL;
118718cfdf1bSSunil Mushran
118818cfdf1bSSunil Mushran if (status) {
118918cfdf1bSSunil Mushran if (remote && !local)
119018cfdf1bSSunil Mushran mlog(ML_ERROR, "Domain %s: Node %d (%pI4:%u) "
119118cfdf1bSSunil Mushran "registered in joining node %d but not in "
119218cfdf1bSSunil Mushran "local node %d\n", qn->qn_domain,
119318cfdf1bSSunil Mushran remote->ni_nodenum,
119418cfdf1bSSunil Mushran &(remote->ni_ipv4_address),
119518cfdf1bSSunil Mushran ntohs(remote->ni_ipv4_port),
119618cfdf1bSSunil Mushran qn->qn_nodenum, dlm->node_num);
119718cfdf1bSSunil Mushran if (local && !remote)
119818cfdf1bSSunil Mushran mlog(ML_ERROR, "Domain %s: Node %d (%pI4:%u) "
119918cfdf1bSSunil Mushran "registered in local node %d but not in "
120018cfdf1bSSunil Mushran "joining node %d\n", qn->qn_domain,
120118cfdf1bSSunil Mushran local->nd_num, &(local->nd_ipv4_address),
120218cfdf1bSSunil Mushran ntohs(local->nd_ipv4_port),
120318cfdf1bSSunil Mushran dlm->node_num, qn->qn_nodenum);
120418cfdf1bSSunil Mushran BUG_ON((!local && !remote));
120518cfdf1bSSunil Mushran }
120618cfdf1bSSunil Mushran
120718cfdf1bSSunil Mushran if (local)
120818cfdf1bSSunil Mushran o2nm_node_put(local);
120918cfdf1bSSunil Mushran }
121018cfdf1bSSunil Mushran
121118cfdf1bSSunil Mushran return status;
121218cfdf1bSSunil Mushran }
121318cfdf1bSSunil Mushran
dlm_send_nodeinfo(struct dlm_ctxt * dlm,unsigned long * node_map)121418cfdf1bSSunil Mushran static int dlm_send_nodeinfo(struct dlm_ctxt *dlm, unsigned long *node_map)
121518cfdf1bSSunil Mushran {
121618cfdf1bSSunil Mushran struct dlm_query_nodeinfo *qn = NULL;
121718cfdf1bSSunil Mushran struct o2nm_node *node;
121818cfdf1bSSunil Mushran int ret = 0, status, count, i;
121918cfdf1bSSunil Mushran
1220b5c7e7ecSYury Norov if (find_first_bit(node_map, O2NM_MAX_NODES) >= O2NM_MAX_NODES)
122118cfdf1bSSunil Mushran goto bail;
122218cfdf1bSSunil Mushran
122318cfdf1bSSunil Mushran qn = kzalloc(sizeof(struct dlm_query_nodeinfo), GFP_KERNEL);
122418cfdf1bSSunil Mushran if (!qn) {
122518cfdf1bSSunil Mushran ret = -ENOMEM;
122618cfdf1bSSunil Mushran mlog_errno(ret);
122718cfdf1bSSunil Mushran goto bail;
122818cfdf1bSSunil Mushran }
122918cfdf1bSSunil Mushran
123018cfdf1bSSunil Mushran for (i = 0, count = 0; i < O2NM_MAX_NODES; ++i) {
123118cfdf1bSSunil Mushran node = o2nm_get_node_by_num(i);
123218cfdf1bSSunil Mushran if (!node)
123318cfdf1bSSunil Mushran continue;
123418cfdf1bSSunil Mushran qn->qn_nodes[count].ni_nodenum = node->nd_num;
123518cfdf1bSSunil Mushran qn->qn_nodes[count].ni_ipv4_port = node->nd_ipv4_port;
123618cfdf1bSSunil Mushran qn->qn_nodes[count].ni_ipv4_address = node->nd_ipv4_address;
123718cfdf1bSSunil Mushran mlog(0, "Node %3d, %pI4:%u\n", node->nd_num,
123818cfdf1bSSunil Mushran &(node->nd_ipv4_address), ntohs(node->nd_ipv4_port));
123918cfdf1bSSunil Mushran ++count;
124018cfdf1bSSunil Mushran o2nm_node_put(node);
124118cfdf1bSSunil Mushran }
124218cfdf1bSSunil Mushran
124318cfdf1bSSunil Mushran qn->qn_nodenum = dlm->node_num;
124418cfdf1bSSunil Mushran qn->qn_numnodes = count;
124518cfdf1bSSunil Mushran qn->qn_namelen = strlen(dlm->name);
124618cfdf1bSSunil Mushran memcpy(qn->qn_domain, dlm->name, qn->qn_namelen);
124718cfdf1bSSunil Mushran
124818cfdf1bSSunil Mushran i = -1;
124918cfdf1bSSunil Mushran while ((i = find_next_bit(node_map, O2NM_MAX_NODES,
125018cfdf1bSSunil Mushran i + 1)) < O2NM_MAX_NODES) {
125118cfdf1bSSunil Mushran if (i == dlm->node_num)
125218cfdf1bSSunil Mushran continue;
125318cfdf1bSSunil Mushran
125418cfdf1bSSunil Mushran mlog(0, "Sending nodeinfo to node %d\n", i);
125518cfdf1bSSunil Mushran
125618cfdf1bSSunil Mushran ret = o2net_send_message(DLM_QUERY_NODEINFO, DLM_MOD_KEY,
125718cfdf1bSSunil Mushran qn, sizeof(struct dlm_query_nodeinfo),
125818cfdf1bSSunil Mushran i, &status);
125918cfdf1bSSunil Mushran if (ret >= 0)
126018cfdf1bSSunil Mushran ret = status;
126118cfdf1bSSunil Mushran if (ret) {
126218cfdf1bSSunil Mushran mlog(ML_ERROR, "node mismatch %d, node %d\n", ret, i);
126318cfdf1bSSunil Mushran break;
126418cfdf1bSSunil Mushran }
126518cfdf1bSSunil Mushran }
126618cfdf1bSSunil Mushran
126718cfdf1bSSunil Mushran bail:
126818cfdf1bSSunil Mushran kfree(qn);
126918cfdf1bSSunil Mushran return ret;
127018cfdf1bSSunil Mushran }
127118cfdf1bSSunil Mushran
dlm_query_nodeinfo_handler(struct o2net_msg * msg,u32 len,void * data,void ** ret_data)127218cfdf1bSSunil Mushran static int dlm_query_nodeinfo_handler(struct o2net_msg *msg, u32 len,
127318cfdf1bSSunil Mushran void *data, void **ret_data)
127418cfdf1bSSunil Mushran {
127518cfdf1bSSunil Mushran struct dlm_query_nodeinfo *qn;
127618cfdf1bSSunil Mushran struct dlm_ctxt *dlm = NULL;
127718cfdf1bSSunil Mushran int locked = 0, status = -EINVAL;
127818cfdf1bSSunil Mushran
127918cfdf1bSSunil Mushran qn = (struct dlm_query_nodeinfo *) msg->buf;
128018cfdf1bSSunil Mushran
128118cfdf1bSSunil Mushran mlog(0, "Node %u queries nodes on domain %s\n", qn->qn_nodenum,
128218cfdf1bSSunil Mushran qn->qn_domain);
128318cfdf1bSSunil Mushran
128418cfdf1bSSunil Mushran spin_lock(&dlm_domain_lock);
128518cfdf1bSSunil Mushran dlm = __dlm_lookup_domain_full(qn->qn_domain, qn->qn_namelen);
128618cfdf1bSSunil Mushran if (!dlm) {
128718cfdf1bSSunil Mushran mlog(ML_ERROR, "Node %d queried nodes on domain %s before "
128818cfdf1bSSunil Mushran "join domain\n", qn->qn_nodenum, qn->qn_domain);
128918cfdf1bSSunil Mushran goto bail;
129018cfdf1bSSunil Mushran }
129118cfdf1bSSunil Mushran
129218cfdf1bSSunil Mushran spin_lock(&dlm->spinlock);
129318cfdf1bSSunil Mushran locked = 1;
129418cfdf1bSSunil Mushran if (dlm->joining_node != qn->qn_nodenum) {
129518cfdf1bSSunil Mushran mlog(ML_ERROR, "Node %d queried nodes on domain %s but "
129618cfdf1bSSunil Mushran "joining node is %d\n", qn->qn_nodenum, qn->qn_domain,
129718cfdf1bSSunil Mushran dlm->joining_node);
129818cfdf1bSSunil Mushran goto bail;
129918cfdf1bSSunil Mushran }
130018cfdf1bSSunil Mushran
130118cfdf1bSSunil Mushran /* Support for node query was added in 1.1 */
130218cfdf1bSSunil Mushran if (dlm->dlm_locking_proto.pv_major == 1 &&
130318cfdf1bSSunil Mushran dlm->dlm_locking_proto.pv_minor == 0) {
130418cfdf1bSSunil Mushran mlog(ML_ERROR, "Node %d queried nodes on domain %s "
130518cfdf1bSSunil Mushran "but active dlm protocol is %d.%d\n", qn->qn_nodenum,
130618cfdf1bSSunil Mushran qn->qn_domain, dlm->dlm_locking_proto.pv_major,
130718cfdf1bSSunil Mushran dlm->dlm_locking_proto.pv_minor);
130818cfdf1bSSunil Mushran goto bail;
130918cfdf1bSSunil Mushran }
131018cfdf1bSSunil Mushran
131118cfdf1bSSunil Mushran status = dlm_match_nodes(dlm, qn);
131218cfdf1bSSunil Mushran
131318cfdf1bSSunil Mushran bail:
131418cfdf1bSSunil Mushran if (locked)
131518cfdf1bSSunil Mushran spin_unlock(&dlm->spinlock);
131618cfdf1bSSunil Mushran spin_unlock(&dlm_domain_lock);
131718cfdf1bSSunil Mushran
131818cfdf1bSSunil Mushran return status;
131918cfdf1bSSunil Mushran }
132018cfdf1bSSunil Mushran
dlm_cancel_join_handler(struct o2net_msg * msg,u32 len,void * data,void ** ret_data)1321d74c9803SKurt Hackel static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data,
1322d74c9803SKurt Hackel void **ret_data)
13236714d8e8SKurt Hackel {
13246714d8e8SKurt Hackel struct dlm_cancel_join *cancel;
13256714d8e8SKurt Hackel struct dlm_ctxt *dlm = NULL;
13266714d8e8SKurt Hackel
13276714d8e8SKurt Hackel cancel = (struct dlm_cancel_join *) msg->buf;
13286714d8e8SKurt Hackel
13296714d8e8SKurt Hackel mlog(0, "node %u cancels join on domain %s\n", cancel->node_idx,
13306714d8e8SKurt Hackel cancel->domain);
13316714d8e8SKurt Hackel
13326714d8e8SKurt Hackel spin_lock(&dlm_domain_lock);
13336714d8e8SKurt Hackel dlm = __dlm_lookup_domain_full(cancel->domain, cancel->name_len);
13346714d8e8SKurt Hackel
13356714d8e8SKurt Hackel if (dlm) {
13366714d8e8SKurt Hackel spin_lock(&dlm->spinlock);
13376714d8e8SKurt Hackel
13386714d8e8SKurt Hackel /* Yikes, this guy wants to cancel his join. No
13396714d8e8SKurt Hackel * problem, we simply cleanup our join state. */
13406714d8e8SKurt Hackel BUG_ON(dlm->joining_node != cancel->node_idx);
13416714d8e8SKurt Hackel __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN);
13426714d8e8SKurt Hackel
13436714d8e8SKurt Hackel spin_unlock(&dlm->spinlock);
13446714d8e8SKurt Hackel }
13456714d8e8SKurt Hackel spin_unlock(&dlm_domain_lock);
13466714d8e8SKurt Hackel
13476714d8e8SKurt Hackel return 0;
13486714d8e8SKurt Hackel }
13496714d8e8SKurt Hackel
dlm_send_one_join_cancel(struct dlm_ctxt * dlm,unsigned int node)13506714d8e8SKurt Hackel static int dlm_send_one_join_cancel(struct dlm_ctxt *dlm,
13516714d8e8SKurt Hackel unsigned int node)
13526714d8e8SKurt Hackel {
13536714d8e8SKurt Hackel int status;
13546714d8e8SKurt Hackel struct dlm_cancel_join cancel_msg;
13556714d8e8SKurt Hackel
13566714d8e8SKurt Hackel memset(&cancel_msg, 0, sizeof(cancel_msg));
13576714d8e8SKurt Hackel cancel_msg.node_idx = dlm->node_num;
13586714d8e8SKurt Hackel cancel_msg.name_len = strlen(dlm->name);
13596714d8e8SKurt Hackel memcpy(cancel_msg.domain, dlm->name, cancel_msg.name_len);
13606714d8e8SKurt Hackel
13616714d8e8SKurt Hackel status = o2net_send_message(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY,
13626714d8e8SKurt Hackel &cancel_msg, sizeof(cancel_msg), node,
13636714d8e8SKurt Hackel NULL);
13646714d8e8SKurt Hackel if (status < 0) {
1365a5196ec5SWengang Wang mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to "
1366a5196ec5SWengang Wang "node %u\n", status, DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY,
1367a5196ec5SWengang Wang node);
13686714d8e8SKurt Hackel goto bail;
13696714d8e8SKurt Hackel }
13706714d8e8SKurt Hackel
13716714d8e8SKurt Hackel bail:
13726714d8e8SKurt Hackel return status;
13736714d8e8SKurt Hackel }
13746714d8e8SKurt Hackel
13756714d8e8SKurt Hackel /* map_size should be in bytes. */
dlm_send_join_cancels(struct dlm_ctxt * dlm,unsigned long * node_map,unsigned int map_size)13766714d8e8SKurt Hackel static int dlm_send_join_cancels(struct dlm_ctxt *dlm,
13776714d8e8SKurt Hackel unsigned long *node_map,
13786714d8e8SKurt Hackel unsigned int map_size)
13796714d8e8SKurt Hackel {
13806714d8e8SKurt Hackel int status, tmpstat;
13818d67d3c2SJun Piao int node;
13826714d8e8SKurt Hackel
13836714d8e8SKurt Hackel if (map_size != (BITS_TO_LONGS(O2NM_MAX_NODES) *
13846714d8e8SKurt Hackel sizeof(unsigned long))) {
13856714d8e8SKurt Hackel mlog(ML_ERROR,
13866714d8e8SKurt Hackel "map_size %u != BITS_TO_LONGS(O2NM_MAX_NODES) %u\n",
13873a4780a8SAndrew Morton map_size, (unsigned)BITS_TO_LONGS(O2NM_MAX_NODES));
13886714d8e8SKurt Hackel return -EINVAL;
13896714d8e8SKurt Hackel }
13906714d8e8SKurt Hackel
13916714d8e8SKurt Hackel status = 0;
13926714d8e8SKurt Hackel node = -1;
13936714d8e8SKurt Hackel while ((node = find_next_bit(node_map, O2NM_MAX_NODES,
13946714d8e8SKurt Hackel node + 1)) < O2NM_MAX_NODES) {
13956714d8e8SKurt Hackel if (node == dlm->node_num)
13966714d8e8SKurt Hackel continue;
13976714d8e8SKurt Hackel
13986714d8e8SKurt Hackel tmpstat = dlm_send_one_join_cancel(dlm, node);
13996714d8e8SKurt Hackel if (tmpstat) {
14006714d8e8SKurt Hackel mlog(ML_ERROR, "Error return %d cancelling join on "
14016714d8e8SKurt Hackel "node %d\n", tmpstat, node);
14026714d8e8SKurt Hackel if (!status)
14036714d8e8SKurt Hackel status = tmpstat;
14046714d8e8SKurt Hackel }
14056714d8e8SKurt Hackel }
14066714d8e8SKurt Hackel
14076714d8e8SKurt Hackel if (status)
14086714d8e8SKurt Hackel mlog_errno(status);
14096714d8e8SKurt Hackel return status;
14106714d8e8SKurt Hackel }
14116714d8e8SKurt Hackel
dlm_request_join(struct dlm_ctxt * dlm,int node,enum dlm_query_join_response_code * response)14126714d8e8SKurt Hackel static int dlm_request_join(struct dlm_ctxt *dlm,
14136714d8e8SKurt Hackel int node,
1414d24fbcdaSJoel Becker enum dlm_query_join_response_code *response)
14156714d8e8SKurt Hackel {
1416d24fbcdaSJoel Becker int status;
14176714d8e8SKurt Hackel struct dlm_query_join_request join_msg;
14180f71b7b4SJoel Becker struct dlm_query_join_packet packet;
14190f71b7b4SJoel Becker u32 join_resp;
14206714d8e8SKurt Hackel
14216714d8e8SKurt Hackel mlog(0, "querying node %d\n", node);
14226714d8e8SKurt Hackel
14236714d8e8SKurt Hackel memset(&join_msg, 0, sizeof(join_msg));
14246714d8e8SKurt Hackel join_msg.node_idx = dlm->node_num;
14256714d8e8SKurt Hackel join_msg.name_len = strlen(dlm->name);
14266714d8e8SKurt Hackel memcpy(join_msg.domain, dlm->name, join_msg.name_len);
1427d24fbcdaSJoel Becker join_msg.dlm_proto = dlm->dlm_locking_proto;
1428d24fbcdaSJoel Becker join_msg.fs_proto = dlm->fs_locking_proto;
14296714d8e8SKurt Hackel
14301faf2894SSrinivas Eeda /* copy live node map to join message */
14311faf2894SSrinivas Eeda byte_copymap(join_msg.node_map, dlm->live_nodes_map, O2NM_MAX_NODES);
14321faf2894SSrinivas Eeda
14336714d8e8SKurt Hackel status = o2net_send_message(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, &join_msg,
1434a5196ec5SWengang Wang sizeof(join_msg), node, &join_resp);
14356714d8e8SKurt Hackel if (status < 0 && status != -ENOPROTOOPT) {
1436a5196ec5SWengang Wang mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to "
1437a5196ec5SWengang Wang "node %u\n", status, DLM_QUERY_JOIN_MSG, DLM_MOD_KEY,
1438a5196ec5SWengang Wang node);
14396714d8e8SKurt Hackel goto bail;
14406714d8e8SKurt Hackel }
14410f71b7b4SJoel Becker dlm_query_join_wire_to_packet(join_resp, &packet);
14426714d8e8SKurt Hackel
14436714d8e8SKurt Hackel /* -ENOPROTOOPT from the net code means the other side isn't
14446714d8e8SKurt Hackel listening for our message type -- that's fine, it means
14456714d8e8SKurt Hackel his dlm isn't up, so we can consider him a 'yes' but not
14466714d8e8SKurt Hackel joined into the domain. */
14476714d8e8SKurt Hackel if (status == -ENOPROTOOPT) {
14486714d8e8SKurt Hackel status = 0;
14496714d8e8SKurt Hackel *response = JOIN_OK_NO_MAP;
145072f6fe1fSNorton.Zhu } else {
14510f71b7b4SJoel Becker *response = packet.code;
145272f6fe1fSNorton.Zhu switch (packet.code) {
145372f6fe1fSNorton.Zhu case JOIN_DISALLOW:
145472f6fe1fSNorton.Zhu case JOIN_OK_NO_MAP:
145572f6fe1fSNorton.Zhu break;
145672f6fe1fSNorton.Zhu case JOIN_PROTOCOL_MISMATCH:
1457d24fbcdaSJoel Becker mlog(ML_NOTICE,
1458d24fbcdaSJoel Becker "This node requested DLM locking protocol %u.%u and "
1459d24fbcdaSJoel Becker "filesystem locking protocol %u.%u. At least one of "
1460d24fbcdaSJoel Becker "the protocol versions on node %d is not compatible, "
1461d24fbcdaSJoel Becker "disconnecting\n",
1462d24fbcdaSJoel Becker dlm->dlm_locking_proto.pv_major,
1463d24fbcdaSJoel Becker dlm->dlm_locking_proto.pv_minor,
1464d24fbcdaSJoel Becker dlm->fs_locking_proto.pv_major,
1465d24fbcdaSJoel Becker dlm->fs_locking_proto.pv_minor,
1466d24fbcdaSJoel Becker node);
1467d24fbcdaSJoel Becker status = -EPROTO;
146872f6fe1fSNorton.Zhu break;
146972f6fe1fSNorton.Zhu case JOIN_OK:
1470d24fbcdaSJoel Becker /* Use the same locking protocol as the remote node */
14710f71b7b4SJoel Becker dlm->dlm_locking_proto.pv_minor = packet.dlm_minor;
14720f71b7b4SJoel Becker dlm->fs_locking_proto.pv_minor = packet.fs_minor;
1473d24fbcdaSJoel Becker mlog(0,
1474d24fbcdaSJoel Becker "Node %d responds JOIN_OK with DLM locking protocol "
1475d24fbcdaSJoel Becker "%u.%u and fs locking protocol %u.%u\n",
1476d24fbcdaSJoel Becker node,
1477d24fbcdaSJoel Becker dlm->dlm_locking_proto.pv_major,
1478d24fbcdaSJoel Becker dlm->dlm_locking_proto.pv_minor,
1479d24fbcdaSJoel Becker dlm->fs_locking_proto.pv_major,
1480d24fbcdaSJoel Becker dlm->fs_locking_proto.pv_minor);
148172f6fe1fSNorton.Zhu break;
148272f6fe1fSNorton.Zhu default:
14836714d8e8SKurt Hackel status = -EINVAL;
1484d24fbcdaSJoel Becker mlog(ML_ERROR, "invalid response %d from node %u\n",
14850f71b7b4SJoel Becker packet.code, node);
148672f6fe1fSNorton.Zhu /* Reset response to JOIN_DISALLOW */
148772f6fe1fSNorton.Zhu *response = JOIN_DISALLOW;
148872f6fe1fSNorton.Zhu break;
148972f6fe1fSNorton.Zhu }
14906714d8e8SKurt Hackel }
14916714d8e8SKurt Hackel
14926714d8e8SKurt Hackel mlog(0, "status %d, node %d response is %d\n", status, node,
14936714d8e8SKurt Hackel *response);
14946714d8e8SKurt Hackel
14956714d8e8SKurt Hackel bail:
14966714d8e8SKurt Hackel return status;
14976714d8e8SKurt Hackel }
14986714d8e8SKurt Hackel
dlm_send_one_join_assert(struct dlm_ctxt * dlm,unsigned int node)14996714d8e8SKurt Hackel static int dlm_send_one_join_assert(struct dlm_ctxt *dlm,
15006714d8e8SKurt Hackel unsigned int node)
15016714d8e8SKurt Hackel {
15026714d8e8SKurt Hackel int status;
150301c6222fSXue jiufei int ret;
15046714d8e8SKurt Hackel struct dlm_assert_joined assert_msg;
15056714d8e8SKurt Hackel
15066714d8e8SKurt Hackel mlog(0, "Sending join assert to node %u\n", node);
15076714d8e8SKurt Hackel
15086714d8e8SKurt Hackel memset(&assert_msg, 0, sizeof(assert_msg));
15096714d8e8SKurt Hackel assert_msg.node_idx = dlm->node_num;
15106714d8e8SKurt Hackel assert_msg.name_len = strlen(dlm->name);
15116714d8e8SKurt Hackel memcpy(assert_msg.domain, dlm->name, assert_msg.name_len);
15126714d8e8SKurt Hackel
15136714d8e8SKurt Hackel status = o2net_send_message(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY,
15146714d8e8SKurt Hackel &assert_msg, sizeof(assert_msg), node,
151501c6222fSXue jiufei &ret);
15166714d8e8SKurt Hackel if (status < 0)
1517a5196ec5SWengang Wang mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to "
1518a5196ec5SWengang Wang "node %u\n", status, DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY,
1519a5196ec5SWengang Wang node);
152001c6222fSXue jiufei else
152101c6222fSXue jiufei status = ret;
15226714d8e8SKurt Hackel
15236714d8e8SKurt Hackel return status;
15246714d8e8SKurt Hackel }
15256714d8e8SKurt Hackel
dlm_send_join_asserts(struct dlm_ctxt * dlm,unsigned long * node_map)15266714d8e8SKurt Hackel static void dlm_send_join_asserts(struct dlm_ctxt *dlm,
15276714d8e8SKurt Hackel unsigned long *node_map)
15286714d8e8SKurt Hackel {
15296714d8e8SKurt Hackel int status, node, live;
15306714d8e8SKurt Hackel
15316714d8e8SKurt Hackel status = 0;
15326714d8e8SKurt Hackel node = -1;
15336714d8e8SKurt Hackel while ((node = find_next_bit(node_map, O2NM_MAX_NODES,
15346714d8e8SKurt Hackel node + 1)) < O2NM_MAX_NODES) {
15356714d8e8SKurt Hackel if (node == dlm->node_num)
15366714d8e8SKurt Hackel continue;
15376714d8e8SKurt Hackel
15386714d8e8SKurt Hackel do {
15396714d8e8SKurt Hackel /* It is very important that this message be
15406714d8e8SKurt Hackel * received so we spin until either the node
15416714d8e8SKurt Hackel * has died or it gets the message. */
15426714d8e8SKurt Hackel status = dlm_send_one_join_assert(dlm, node);
15436714d8e8SKurt Hackel
15446714d8e8SKurt Hackel spin_lock(&dlm->spinlock);
15456714d8e8SKurt Hackel live = test_bit(node, dlm->live_nodes_map);
15466714d8e8SKurt Hackel spin_unlock(&dlm->spinlock);
15476714d8e8SKurt Hackel
15486714d8e8SKurt Hackel if (status) {
15496714d8e8SKurt Hackel mlog(ML_ERROR, "Error return %d asserting "
15506714d8e8SKurt Hackel "join on node %d\n", status, node);
15516714d8e8SKurt Hackel
15526714d8e8SKurt Hackel /* give us some time between errors... */
15536714d8e8SKurt Hackel if (live)
15546714d8e8SKurt Hackel msleep(DLM_DOMAIN_BACKOFF_MS);
15556714d8e8SKurt Hackel }
15566714d8e8SKurt Hackel } while (status && live);
15576714d8e8SKurt Hackel }
15586714d8e8SKurt Hackel }
15596714d8e8SKurt Hackel
15606714d8e8SKurt Hackel struct domain_join_ctxt {
15616714d8e8SKurt Hackel unsigned long live_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
15626714d8e8SKurt Hackel unsigned long yes_resp_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
15636714d8e8SKurt Hackel };
15646714d8e8SKurt Hackel
dlm_should_restart_join(struct dlm_ctxt * dlm,struct domain_join_ctxt * ctxt,enum dlm_query_join_response_code response)15656714d8e8SKurt Hackel static int dlm_should_restart_join(struct dlm_ctxt *dlm,
15666714d8e8SKurt Hackel struct domain_join_ctxt *ctxt,
1567d24fbcdaSJoel Becker enum dlm_query_join_response_code response)
15686714d8e8SKurt Hackel {
15696714d8e8SKurt Hackel int ret;
15706714d8e8SKurt Hackel
15716714d8e8SKurt Hackel if (response == JOIN_DISALLOW) {
15726714d8e8SKurt Hackel mlog(0, "Latest response of disallow -- should restart\n");
15736714d8e8SKurt Hackel return 1;
15746714d8e8SKurt Hackel }
15756714d8e8SKurt Hackel
15766714d8e8SKurt Hackel spin_lock(&dlm->spinlock);
15776714d8e8SKurt Hackel /* For now, we restart the process if the node maps have
15786714d8e8SKurt Hackel * changed at all */
1579*b270f492SJoseph Qi ret = !bitmap_equal(ctxt->live_map, dlm->live_nodes_map,
1580*b270f492SJoseph Qi O2NM_MAX_NODES);
15816714d8e8SKurt Hackel spin_unlock(&dlm->spinlock);
15826714d8e8SKurt Hackel
15836714d8e8SKurt Hackel if (ret)
15846714d8e8SKurt Hackel mlog(0, "Node maps changed -- should restart\n");
15856714d8e8SKurt Hackel
15866714d8e8SKurt Hackel return ret;
15876714d8e8SKurt Hackel }
15886714d8e8SKurt Hackel
dlm_try_to_join_domain(struct dlm_ctxt * dlm)15896714d8e8SKurt Hackel static int dlm_try_to_join_domain(struct dlm_ctxt *dlm)
15906714d8e8SKurt Hackel {
15916714d8e8SKurt Hackel int status = 0, tmpstat, node;
15926714d8e8SKurt Hackel struct domain_join_ctxt *ctxt;
1593d24fbcdaSJoel Becker enum dlm_query_join_response_code response = JOIN_DISALLOW;
15946714d8e8SKurt Hackel
1595ef6b689bSTao Ma mlog(0, "%p", dlm);
15966714d8e8SKurt Hackel
1597cd861280SRobert P. J. Day ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
15986714d8e8SKurt Hackel if (!ctxt) {
15996714d8e8SKurt Hackel status = -ENOMEM;
16006714d8e8SKurt Hackel mlog_errno(status);
16016714d8e8SKurt Hackel goto bail;
16026714d8e8SKurt Hackel }
16036714d8e8SKurt Hackel
16046714d8e8SKurt Hackel /* group sem locking should work for us here -- we're already
16056714d8e8SKurt Hackel * registered for heartbeat events so filling this should be
16066714d8e8SKurt Hackel * atomic wrt getting those handlers called. */
16076d4a93b6SJoseph Qi o2hb_fill_node_map(dlm->live_nodes_map, O2NM_MAX_NODES);
16086714d8e8SKurt Hackel
16096714d8e8SKurt Hackel spin_lock(&dlm->spinlock);
1610*b270f492SJoseph Qi bitmap_copy(ctxt->live_map, dlm->live_nodes_map, O2NM_MAX_NODES);
16116714d8e8SKurt Hackel __dlm_set_joining_node(dlm, dlm->node_num);
16126714d8e8SKurt Hackel spin_unlock(&dlm->spinlock);
16136714d8e8SKurt Hackel
16146714d8e8SKurt Hackel node = -1;
16156714d8e8SKurt Hackel while ((node = find_next_bit(ctxt->live_map, O2NM_MAX_NODES,
16166714d8e8SKurt Hackel node + 1)) < O2NM_MAX_NODES) {
16176714d8e8SKurt Hackel if (node == dlm->node_num)
16186714d8e8SKurt Hackel continue;
16196714d8e8SKurt Hackel
16206714d8e8SKurt Hackel status = dlm_request_join(dlm, node, &response);
16216714d8e8SKurt Hackel if (status < 0) {
16226714d8e8SKurt Hackel mlog_errno(status);
16236714d8e8SKurt Hackel goto bail;
16246714d8e8SKurt Hackel }
16256714d8e8SKurt Hackel
16266714d8e8SKurt Hackel /* Ok, either we got a response or the node doesn't have a
16276714d8e8SKurt Hackel * dlm up. */
16286714d8e8SKurt Hackel if (response == JOIN_OK)
16296714d8e8SKurt Hackel set_bit(node, ctxt->yes_resp_map);
16306714d8e8SKurt Hackel
16316714d8e8SKurt Hackel if (dlm_should_restart_join(dlm, ctxt, response)) {
16326714d8e8SKurt Hackel status = -EAGAIN;
16336714d8e8SKurt Hackel goto bail;
16346714d8e8SKurt Hackel }
16356714d8e8SKurt Hackel }
16366714d8e8SKurt Hackel
16376714d8e8SKurt Hackel mlog(0, "Yay, done querying nodes!\n");
16386714d8e8SKurt Hackel
16396714d8e8SKurt Hackel /* Yay, everyone agree's we can join the domain. My domain is
16406714d8e8SKurt Hackel * comprised of all nodes who were put in the
16416714d8e8SKurt Hackel * yes_resp_map. Copy that into our domain map and send a join
16426714d8e8SKurt Hackel * assert message to clean up everyone elses state. */
16436714d8e8SKurt Hackel spin_lock(&dlm->spinlock);
1644*b270f492SJoseph Qi bitmap_copy(dlm->domain_map, ctxt->yes_resp_map, O2NM_MAX_NODES);
16456714d8e8SKurt Hackel set_bit(dlm->node_num, dlm->domain_map);
16466714d8e8SKurt Hackel spin_unlock(&dlm->spinlock);
16476714d8e8SKurt Hackel
164818cfdf1bSSunil Mushran /* Support for global heartbeat and node info was added in 1.1 */
16494da6dc29SSunil Mushran if (dlm->dlm_locking_proto.pv_major > 1 ||
16504da6dc29SSunil Mushran dlm->dlm_locking_proto.pv_minor > 0) {
165118cfdf1bSSunil Mushran status = dlm_send_nodeinfo(dlm, ctxt->yes_resp_map);
165218cfdf1bSSunil Mushran if (status) {
165318cfdf1bSSunil Mushran mlog_errno(status);
165418cfdf1bSSunil Mushran goto bail;
165518cfdf1bSSunil Mushran }
1656ea203441SSunil Mushran status = dlm_send_regions(dlm, ctxt->yes_resp_map);
1657ea203441SSunil Mushran if (status) {
1658ea203441SSunil Mushran mlog_errno(status);
1659ea203441SSunil Mushran goto bail;
1660ea203441SSunil Mushran }
1661ea203441SSunil Mushran }
1662ea203441SSunil Mushran
16636714d8e8SKurt Hackel dlm_send_join_asserts(dlm, ctxt->yes_resp_map);
16646714d8e8SKurt Hackel
16656714d8e8SKurt Hackel /* Joined state *must* be set before the joining node
16666714d8e8SKurt Hackel * information, otherwise the query_join handler may read no
16676714d8e8SKurt Hackel * current joiner but a state of NEW and tell joining nodes
16686714d8e8SKurt Hackel * we're not in the domain. */
16696714d8e8SKurt Hackel spin_lock(&dlm_domain_lock);
16706714d8e8SKurt Hackel dlm->dlm_state = DLM_CTXT_JOINED;
16716714d8e8SKurt Hackel dlm->num_joins++;
16726714d8e8SKurt Hackel spin_unlock(&dlm_domain_lock);
16736714d8e8SKurt Hackel
16746714d8e8SKurt Hackel bail:
16756714d8e8SKurt Hackel spin_lock(&dlm->spinlock);
16766714d8e8SKurt Hackel __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN);
16778decab3cSSunil Mushran if (!status) {
16788decab3cSSunil Mushran printk(KERN_NOTICE "o2dlm: Joining domain %s ", dlm->name);
16796714d8e8SKurt Hackel __dlm_print_nodes(dlm);
16808decab3cSSunil Mushran }
16816714d8e8SKurt Hackel spin_unlock(&dlm->spinlock);
16826714d8e8SKurt Hackel
16836714d8e8SKurt Hackel if (ctxt) {
16846714d8e8SKurt Hackel /* Do we need to send a cancel message to any nodes? */
16856714d8e8SKurt Hackel if (status < 0) {
16866714d8e8SKurt Hackel tmpstat = dlm_send_join_cancels(dlm,
16876714d8e8SKurt Hackel ctxt->yes_resp_map,
16886714d8e8SKurt Hackel sizeof(ctxt->yes_resp_map));
16896714d8e8SKurt Hackel if (tmpstat < 0)
16906714d8e8SKurt Hackel mlog_errno(tmpstat);
16916714d8e8SKurt Hackel }
16926714d8e8SKurt Hackel kfree(ctxt);
16936714d8e8SKurt Hackel }
16946714d8e8SKurt Hackel
16956714d8e8SKurt Hackel mlog(0, "returning %d\n", status);
16966714d8e8SKurt Hackel return status;
16976714d8e8SKurt Hackel }
16986714d8e8SKurt Hackel
dlm_unregister_domain_handlers(struct dlm_ctxt * dlm)16996714d8e8SKurt Hackel static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm)
17006714d8e8SKurt Hackel {
170158a3158aSSunil Mushran o2hb_unregister_callback(dlm->name, &dlm->dlm_hb_up);
170258a3158aSSunil Mushran o2hb_unregister_callback(dlm->name, &dlm->dlm_hb_down);
17036714d8e8SKurt Hackel o2net_unregister_handler_list(&dlm->dlm_domain_handlers);
17046714d8e8SKurt Hackel }
17056714d8e8SKurt Hackel
dlm_register_domain_handlers(struct dlm_ctxt * dlm)17066714d8e8SKurt Hackel static int dlm_register_domain_handlers(struct dlm_ctxt *dlm)
17076714d8e8SKurt Hackel {
17086714d8e8SKurt Hackel int status;
17096714d8e8SKurt Hackel
17106714d8e8SKurt Hackel mlog(0, "registering handlers.\n");
17116714d8e8SKurt Hackel
17126714d8e8SKurt Hackel o2hb_setup_callback(&dlm->dlm_hb_down, O2HB_NODE_DOWN_CB,
17136714d8e8SKurt Hackel dlm_hb_node_down_cb, dlm, DLM_HB_NODE_DOWN_PRI);
1714cdd09f49SJoseph Qi o2hb_setup_callback(&dlm->dlm_hb_up, O2HB_NODE_UP_CB,
1715cdd09f49SJoseph Qi dlm_hb_node_up_cb, dlm, DLM_HB_NODE_UP_PRI);
1716cdd09f49SJoseph Qi
171758a3158aSSunil Mushran status = o2hb_register_callback(dlm->name, &dlm->dlm_hb_down);
17186714d8e8SKurt Hackel if (status)
17196714d8e8SKurt Hackel goto bail;
17206714d8e8SKurt Hackel
172158a3158aSSunil Mushran status = o2hb_register_callback(dlm->name, &dlm->dlm_hb_up);
17226714d8e8SKurt Hackel if (status)
17236714d8e8SKurt Hackel goto bail;
17246714d8e8SKurt Hackel
17256714d8e8SKurt Hackel status = o2net_register_handler(DLM_MASTER_REQUEST_MSG, dlm->key,
17266714d8e8SKurt Hackel sizeof(struct dlm_master_request),
17276714d8e8SKurt Hackel dlm_master_request_handler,
1728d74c9803SKurt Hackel dlm, NULL, &dlm->dlm_domain_handlers);
17296714d8e8SKurt Hackel if (status)
17306714d8e8SKurt Hackel goto bail;
17316714d8e8SKurt Hackel
17326714d8e8SKurt Hackel status = o2net_register_handler(DLM_ASSERT_MASTER_MSG, dlm->key,
17336714d8e8SKurt Hackel sizeof(struct dlm_assert_master),
17346714d8e8SKurt Hackel dlm_assert_master_handler,
17353b8118cfSKurt Hackel dlm, dlm_assert_master_post_handler,
17363b8118cfSKurt Hackel &dlm->dlm_domain_handlers);
17376714d8e8SKurt Hackel if (status)
17386714d8e8SKurt Hackel goto bail;
17396714d8e8SKurt Hackel
17406714d8e8SKurt Hackel status = o2net_register_handler(DLM_CREATE_LOCK_MSG, dlm->key,
17416714d8e8SKurt Hackel sizeof(struct dlm_create_lock),
17426714d8e8SKurt Hackel dlm_create_lock_handler,
1743d74c9803SKurt Hackel dlm, NULL, &dlm->dlm_domain_handlers);
17446714d8e8SKurt Hackel if (status)
17456714d8e8SKurt Hackel goto bail;
17466714d8e8SKurt Hackel
17476714d8e8SKurt Hackel status = o2net_register_handler(DLM_CONVERT_LOCK_MSG, dlm->key,
17486714d8e8SKurt Hackel DLM_CONVERT_LOCK_MAX_LEN,
17496714d8e8SKurt Hackel dlm_convert_lock_handler,
1750d74c9803SKurt Hackel dlm, NULL, &dlm->dlm_domain_handlers);
17516714d8e8SKurt Hackel if (status)
17526714d8e8SKurt Hackel goto bail;
17536714d8e8SKurt Hackel
17546714d8e8SKurt Hackel status = o2net_register_handler(DLM_UNLOCK_LOCK_MSG, dlm->key,
17556714d8e8SKurt Hackel DLM_UNLOCK_LOCK_MAX_LEN,
17566714d8e8SKurt Hackel dlm_unlock_lock_handler,
1757d74c9803SKurt Hackel dlm, NULL, &dlm->dlm_domain_handlers);
17586714d8e8SKurt Hackel if (status)
17596714d8e8SKurt Hackel goto bail;
17606714d8e8SKurt Hackel
17616714d8e8SKurt Hackel status = o2net_register_handler(DLM_PROXY_AST_MSG, dlm->key,
17626714d8e8SKurt Hackel DLM_PROXY_AST_MAX_LEN,
17636714d8e8SKurt Hackel dlm_proxy_ast_handler,
1764d74c9803SKurt Hackel dlm, NULL, &dlm->dlm_domain_handlers);
17656714d8e8SKurt Hackel if (status)
17666714d8e8SKurt Hackel goto bail;
17676714d8e8SKurt Hackel
17686714d8e8SKurt Hackel status = o2net_register_handler(DLM_EXIT_DOMAIN_MSG, dlm->key,
17696714d8e8SKurt Hackel sizeof(struct dlm_exit_domain),
17706714d8e8SKurt Hackel dlm_exit_domain_handler,
1771d74c9803SKurt Hackel dlm, NULL, &dlm->dlm_domain_handlers);
17726714d8e8SKurt Hackel if (status)
17736714d8e8SKurt Hackel goto bail;
17746714d8e8SKurt Hackel
1775ba2bf218SKurt Hackel status = o2net_register_handler(DLM_DEREF_LOCKRES_MSG, dlm->key,
1776ba2bf218SKurt Hackel sizeof(struct dlm_deref_lockres),
1777ba2bf218SKurt Hackel dlm_deref_lockres_handler,
1778d74c9803SKurt Hackel dlm, NULL, &dlm->dlm_domain_handlers);
1779ba2bf218SKurt Hackel if (status)
1780ba2bf218SKurt Hackel goto bail;
1781ba2bf218SKurt Hackel
17826714d8e8SKurt Hackel status = o2net_register_handler(DLM_MIGRATE_REQUEST_MSG, dlm->key,
17836714d8e8SKurt Hackel sizeof(struct dlm_migrate_request),
17846714d8e8SKurt Hackel dlm_migrate_request_handler,
1785d74c9803SKurt Hackel dlm, NULL, &dlm->dlm_domain_handlers);
17866714d8e8SKurt Hackel if (status)
17876714d8e8SKurt Hackel goto bail;
17886714d8e8SKurt Hackel
17896714d8e8SKurt Hackel status = o2net_register_handler(DLM_MIG_LOCKRES_MSG, dlm->key,
17906714d8e8SKurt Hackel DLM_MIG_LOCKRES_MAX_LEN,
17916714d8e8SKurt Hackel dlm_mig_lockres_handler,
1792d74c9803SKurt Hackel dlm, NULL, &dlm->dlm_domain_handlers);
17936714d8e8SKurt Hackel if (status)
17946714d8e8SKurt Hackel goto bail;
17956714d8e8SKurt Hackel
17966714d8e8SKurt Hackel status = o2net_register_handler(DLM_MASTER_REQUERY_MSG, dlm->key,
17976714d8e8SKurt Hackel sizeof(struct dlm_master_requery),
17986714d8e8SKurt Hackel dlm_master_requery_handler,
1799d74c9803SKurt Hackel dlm, NULL, &dlm->dlm_domain_handlers);
18006714d8e8SKurt Hackel if (status)
18016714d8e8SKurt Hackel goto bail;
18026714d8e8SKurt Hackel
18036714d8e8SKurt Hackel status = o2net_register_handler(DLM_LOCK_REQUEST_MSG, dlm->key,
18046714d8e8SKurt Hackel sizeof(struct dlm_lock_request),
18056714d8e8SKurt Hackel dlm_request_all_locks_handler,
1806d74c9803SKurt Hackel dlm, NULL, &dlm->dlm_domain_handlers);
18076714d8e8SKurt Hackel if (status)
18086714d8e8SKurt Hackel goto bail;
18096714d8e8SKurt Hackel
18106714d8e8SKurt Hackel status = o2net_register_handler(DLM_RECO_DATA_DONE_MSG, dlm->key,
18116714d8e8SKurt Hackel sizeof(struct dlm_reco_data_done),
18126714d8e8SKurt Hackel dlm_reco_data_done_handler,
1813d74c9803SKurt Hackel dlm, NULL, &dlm->dlm_domain_handlers);
18146714d8e8SKurt Hackel if (status)
18156714d8e8SKurt Hackel goto bail;
18166714d8e8SKurt Hackel
18176714d8e8SKurt Hackel status = o2net_register_handler(DLM_BEGIN_RECO_MSG, dlm->key,
18186714d8e8SKurt Hackel sizeof(struct dlm_begin_reco),
18196714d8e8SKurt Hackel dlm_begin_reco_handler,
1820d74c9803SKurt Hackel dlm, NULL, &dlm->dlm_domain_handlers);
18216714d8e8SKurt Hackel if (status)
18226714d8e8SKurt Hackel goto bail;
18236714d8e8SKurt Hackel
18246714d8e8SKurt Hackel status = o2net_register_handler(DLM_FINALIZE_RECO_MSG, dlm->key,
18256714d8e8SKurt Hackel sizeof(struct dlm_finalize_reco),
18266714d8e8SKurt Hackel dlm_finalize_reco_handler,
1827d74c9803SKurt Hackel dlm, NULL, &dlm->dlm_domain_handlers);
18286714d8e8SKurt Hackel if (status)
18296714d8e8SKurt Hackel goto bail;
18306714d8e8SKurt Hackel
1831bddefdeeSSunil Mushran status = o2net_register_handler(DLM_BEGIN_EXIT_DOMAIN_MSG, dlm->key,
1832bddefdeeSSunil Mushran sizeof(struct dlm_exit_domain),
1833bddefdeeSSunil Mushran dlm_begin_exit_domain_handler,
1834bddefdeeSSunil Mushran dlm, NULL, &dlm->dlm_domain_handlers);
183560d663cbSxuejiufei if (status)
183660d663cbSxuejiufei goto bail;
1837bddefdeeSSunil Mushran
183860d663cbSxuejiufei status = o2net_register_handler(DLM_DEREF_LOCKRES_DONE, dlm->key,
183960d663cbSxuejiufei sizeof(struct dlm_deref_lockres_done),
184060d663cbSxuejiufei dlm_deref_lockres_done_handler,
184160d663cbSxuejiufei dlm, NULL, &dlm->dlm_domain_handlers);
18426714d8e8SKurt Hackel bail:
18436714d8e8SKurt Hackel if (status)
18446714d8e8SKurt Hackel dlm_unregister_domain_handlers(dlm);
18456714d8e8SKurt Hackel
18466714d8e8SKurt Hackel return status;
18476714d8e8SKurt Hackel }
18486714d8e8SKurt Hackel
dlm_join_domain(struct dlm_ctxt * dlm)18496714d8e8SKurt Hackel static int dlm_join_domain(struct dlm_ctxt *dlm)
18506714d8e8SKurt Hackel {
18516714d8e8SKurt Hackel int status;
18520dd82141SSunil Mushran unsigned int backoff;
18530dd82141SSunil Mushran unsigned int total_backoff = 0;
18545afc44e2SJoseph Qi char wq_name[O2NM_MAX_NAME_LEN];
18556714d8e8SKurt Hackel
18566714d8e8SKurt Hackel BUG_ON(!dlm);
18576714d8e8SKurt Hackel
18586714d8e8SKurt Hackel mlog(0, "Join domain %s\n", dlm->name);
18596714d8e8SKurt Hackel
18606714d8e8SKurt Hackel status = dlm_register_domain_handlers(dlm);
18616714d8e8SKurt Hackel if (status) {
18626714d8e8SKurt Hackel mlog_errno(status);
18636714d8e8SKurt Hackel goto bail;
18646714d8e8SKurt Hackel }
18656714d8e8SKurt Hackel
18666714d8e8SKurt Hackel status = dlm_launch_thread(dlm);
18676714d8e8SKurt Hackel if (status < 0) {
18686714d8e8SKurt Hackel mlog_errno(status);
18696714d8e8SKurt Hackel goto bail;
18706714d8e8SKurt Hackel }
18716714d8e8SKurt Hackel
18726714d8e8SKurt Hackel status = dlm_launch_recovery_thread(dlm);
18736714d8e8SKurt Hackel if (status < 0) {
18746714d8e8SKurt Hackel mlog_errno(status);
18756714d8e8SKurt Hackel goto bail;
18766714d8e8SKurt Hackel }
18776714d8e8SKurt Hackel
1878e581595eSGreg Kroah-Hartman dlm_debug_init(dlm);
1879181a9a04SZongxun Wang
18805afc44e2SJoseph Qi snprintf(wq_name, O2NM_MAX_NAME_LEN, "dlm_wq-%s", dlm->name);
1881055fdcffSBhaktipriya Shridhar dlm->dlm_worker = alloc_workqueue(wq_name, WQ_MEM_RECLAIM, 0);
18823156d267SKurt Hackel if (!dlm->dlm_worker) {
18833156d267SKurt Hackel status = -ENOMEM;
18843156d267SKurt Hackel mlog_errno(status);
18853156d267SKurt Hackel goto bail;
18863156d267SKurt Hackel }
18873156d267SKurt Hackel
18886714d8e8SKurt Hackel do {
18896714d8e8SKurt Hackel status = dlm_try_to_join_domain(dlm);
18906714d8e8SKurt Hackel
18916714d8e8SKurt Hackel /* If we're racing another node to the join, then we
18926714d8e8SKurt Hackel * need to back off temporarily and let them
18936714d8e8SKurt Hackel * complete. */
18940dd82141SSunil Mushran #define DLM_JOIN_TIMEOUT_MSECS 90000
18956714d8e8SKurt Hackel if (status == -EAGAIN) {
18966714d8e8SKurt Hackel if (signal_pending(current)) {
18976714d8e8SKurt Hackel status = -ERESTARTSYS;
18986714d8e8SKurt Hackel goto bail;
18996714d8e8SKurt Hackel }
19006714d8e8SKurt Hackel
19017567c148SXue jiufei if (total_backoff > DLM_JOIN_TIMEOUT_MSECS) {
19020dd82141SSunil Mushran status = -ERESTARTSYS;
19030dd82141SSunil Mushran mlog(ML_NOTICE, "Timed out joining dlm domain "
19040dd82141SSunil Mushran "%s after %u msecs\n", dlm->name,
19057567c148SXue jiufei total_backoff);
19060dd82141SSunil Mushran goto bail;
19070dd82141SSunil Mushran }
19080dd82141SSunil Mushran
19096714d8e8SKurt Hackel /*
19106714d8e8SKurt Hackel * <chip> After you!
19116714d8e8SKurt Hackel * <dale> No, after you!
19126714d8e8SKurt Hackel * <chip> I insist!
19136714d8e8SKurt Hackel * <dale> But you first!
19146714d8e8SKurt Hackel * ...
19156714d8e8SKurt Hackel */
19166714d8e8SKurt Hackel backoff = (unsigned int)(jiffies & 0x3);
19176714d8e8SKurt Hackel backoff *= DLM_DOMAIN_BACKOFF_MS;
19180dd82141SSunil Mushran total_backoff += backoff;
19196714d8e8SKurt Hackel mlog(0, "backoff %d\n", backoff);
19206714d8e8SKurt Hackel msleep(backoff);
19216714d8e8SKurt Hackel }
19226714d8e8SKurt Hackel } while (status == -EAGAIN);
19236714d8e8SKurt Hackel
19246714d8e8SKurt Hackel if (status < 0) {
19256714d8e8SKurt Hackel mlog_errno(status);
19266714d8e8SKurt Hackel goto bail;
19276714d8e8SKurt Hackel }
19286714d8e8SKurt Hackel
19296714d8e8SKurt Hackel status = 0;
19306714d8e8SKurt Hackel bail:
19316714d8e8SKurt Hackel wake_up(&dlm_domain_events);
19326714d8e8SKurt Hackel
19336714d8e8SKurt Hackel if (status) {
19346714d8e8SKurt Hackel dlm_unregister_domain_handlers(dlm);
19356714d8e8SKurt Hackel dlm_complete_thread(dlm);
19366714d8e8SKurt Hackel dlm_complete_recovery_thread(dlm);
19373156d267SKurt Hackel dlm_destroy_dlm_worker(dlm);
19386714d8e8SKurt Hackel }
19396714d8e8SKurt Hackel
19406714d8e8SKurt Hackel return status;
19416714d8e8SKurt Hackel }
19426714d8e8SKurt Hackel
dlm_alloc_ctxt(const char * domain,u32 key)19436714d8e8SKurt Hackel static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain,
19446714d8e8SKurt Hackel u32 key)
19456714d8e8SKurt Hackel {
19466714d8e8SKurt Hackel int i;
19476325b4a2SSunil Mushran int ret;
19486714d8e8SKurt Hackel struct dlm_ctxt *dlm = NULL;
19496714d8e8SKurt Hackel
1950cd861280SRobert P. J. Day dlm = kzalloc(sizeof(*dlm), GFP_KERNEL);
19516714d8e8SKurt Hackel if (!dlm) {
1952190a7721SJoseph Qi ret = -ENOMEM;
1953190a7721SJoseph Qi mlog_errno(ret);
19546714d8e8SKurt Hackel goto leave;
19556714d8e8SKurt Hackel }
19566714d8e8SKurt Hackel
1957316ce2baSJulia Lawall dlm->name = kstrdup(domain, GFP_KERNEL);
19586714d8e8SKurt Hackel if (dlm->name == NULL) {
1959190a7721SJoseph Qi ret = -ENOMEM;
1960190a7721SJoseph Qi mlog_errno(ret);
19616714d8e8SKurt Hackel goto leave;
19626714d8e8SKurt Hackel }
19636714d8e8SKurt Hackel
196403d864c0SDaniel Phillips dlm->lockres_hash = (struct hlist_head **)dlm_alloc_pagevec(DLM_HASH_PAGES);
196581f2094aSMark Fasheh if (!dlm->lockres_hash) {
1966190a7721SJoseph Qi ret = -ENOMEM;
1967190a7721SJoseph Qi mlog_errno(ret);
19686714d8e8SKurt Hackel goto leave;
19696714d8e8SKurt Hackel }
19706714d8e8SKurt Hackel
197181f2094aSMark Fasheh for (i = 0; i < DLM_HASH_BUCKETS; i++)
197203d864c0SDaniel Phillips INIT_HLIST_HEAD(dlm_lockres_hash(dlm, i));
19736714d8e8SKurt Hackel
1974e2b66ddcSSunil Mushran dlm->master_hash = (struct hlist_head **)
1975e2b66ddcSSunil Mushran dlm_alloc_pagevec(DLM_HASH_PAGES);
1976e2b66ddcSSunil Mushran if (!dlm->master_hash) {
1977190a7721SJoseph Qi ret = -ENOMEM;
1978190a7721SJoseph Qi mlog_errno(ret);
1979e2b66ddcSSunil Mushran goto leave;
1980e2b66ddcSSunil Mushran }
1981e2b66ddcSSunil Mushran
1982e2b66ddcSSunil Mushran for (i = 0; i < DLM_HASH_BUCKETS; i++)
1983e2b66ddcSSunil Mushran INIT_HLIST_HEAD(dlm_master_hash(dlm, i));
1984e2b66ddcSSunil Mushran
19856714d8e8SKurt Hackel dlm->key = key;
19866714d8e8SKurt Hackel dlm->node_num = o2nm_this_node();
19876714d8e8SKurt Hackel
19885e7a3ed9SGreg Kroah-Hartman dlm_create_debugfs_subroot(dlm);
19896325b4a2SSunil Mushran
19906714d8e8SKurt Hackel spin_lock_init(&dlm->spinlock);
19916714d8e8SKurt Hackel spin_lock_init(&dlm->master_lock);
19926714d8e8SKurt Hackel spin_lock_init(&dlm->ast_lock);
1993b0d4f817SSunil Mushran spin_lock_init(&dlm->track_lock);
19946714d8e8SKurt Hackel INIT_LIST_HEAD(&dlm->list);
19956714d8e8SKurt Hackel INIT_LIST_HEAD(&dlm->dirty_list);
19966714d8e8SKurt Hackel INIT_LIST_HEAD(&dlm->reco.resources);
19976714d8e8SKurt Hackel INIT_LIST_HEAD(&dlm->reco.node_data);
19986714d8e8SKurt Hackel INIT_LIST_HEAD(&dlm->purge_list);
19996714d8e8SKurt Hackel INIT_LIST_HEAD(&dlm->dlm_domain_handlers);
200029576f8bSSunil Mushran INIT_LIST_HEAD(&dlm->tracking_list);
20016714d8e8SKurt Hackel dlm->reco.state = 0;
20026714d8e8SKurt Hackel
20036714d8e8SKurt Hackel INIT_LIST_HEAD(&dlm->pending_asts);
20046714d8e8SKurt Hackel INIT_LIST_HEAD(&dlm->pending_basts);
20056714d8e8SKurt Hackel
20066714d8e8SKurt Hackel mlog(0, "dlm->recovery_map=%p, &(dlm->recovery_map[0])=%p\n",
20076714d8e8SKurt Hackel dlm->recovery_map, &(dlm->recovery_map[0]));
20086714d8e8SKurt Hackel
2009*b270f492SJoseph Qi bitmap_zero(dlm->recovery_map, O2NM_MAX_NODES);
2010*b270f492SJoseph Qi bitmap_zero(dlm->live_nodes_map, O2NM_MAX_NODES);
2011*b270f492SJoseph Qi bitmap_zero(dlm->domain_map, O2NM_MAX_NODES);
20126714d8e8SKurt Hackel
20136714d8e8SKurt Hackel dlm->dlm_thread_task = NULL;
20146714d8e8SKurt Hackel dlm->dlm_reco_thread_task = NULL;
20153156d267SKurt Hackel dlm->dlm_worker = NULL;
20166714d8e8SKurt Hackel init_waitqueue_head(&dlm->dlm_thread_wq);
20176714d8e8SKurt Hackel init_waitqueue_head(&dlm->dlm_reco_thread_wq);
20186714d8e8SKurt Hackel init_waitqueue_head(&dlm->reco.event);
20196714d8e8SKurt Hackel init_waitqueue_head(&dlm->ast_wq);
20206714d8e8SKurt Hackel init_waitqueue_head(&dlm->migration_wq);
20216714d8e8SKurt Hackel INIT_LIST_HEAD(&dlm->mle_hb_events);
20226714d8e8SKurt Hackel
20236714d8e8SKurt Hackel dlm->joining_node = DLM_LOCK_RES_OWNER_UNKNOWN;
20246714d8e8SKurt Hackel init_waitqueue_head(&dlm->dlm_join_events);
20256714d8e8SKurt Hackel
202660c7ec9eSpiaojun dlm->migrate_done = 0;
202760c7ec9eSpiaojun
20286714d8e8SKurt Hackel dlm->reco.new_master = O2NM_INVALID_NODE_NUM;
20296714d8e8SKurt Hackel dlm->reco.dead_node = O2NM_INVALID_NODE_NUM;
20306714d8e8SKurt Hackel
20316800791aSSunil Mushran atomic_set(&dlm->res_tot_count, 0);
20326800791aSSunil Mushran atomic_set(&dlm->res_cur_count, 0);
20332041d8fdSSunil Mushran for (i = 0; i < DLM_MLE_NUM_TYPES; ++i) {
20342041d8fdSSunil Mushran atomic_set(&dlm->mle_tot_count[i], 0);
20352041d8fdSSunil Mushran atomic_set(&dlm->mle_cur_count[i], 0);
20362041d8fdSSunil Mushran }
20372041d8fdSSunil Mushran
20386714d8e8SKurt Hackel spin_lock_init(&dlm->work_lock);
20396714d8e8SKurt Hackel INIT_LIST_HEAD(&dlm->work_list);
2040c4028958SDavid Howells INIT_WORK(&dlm->dispatched_work, dlm_dispatch_work);
20416714d8e8SKurt Hackel
20426714d8e8SKurt Hackel kref_init(&dlm->dlm_refs);
20436714d8e8SKurt Hackel dlm->dlm_state = DLM_CTXT_NEW;
20446714d8e8SKurt Hackel
20456714d8e8SKurt Hackel INIT_LIST_HEAD(&dlm->dlm_eviction_callbacks);
20466714d8e8SKurt Hackel
20476714d8e8SKurt Hackel mlog(0, "context init: refcount %u\n",
20482c935bc5SPeter Zijlstra kref_read(&dlm->dlm_refs));
20496714d8e8SKurt Hackel
20505e7a3ed9SGreg Kroah-Hartman ret = 0;
20516714d8e8SKurt Hackel leave:
2052190a7721SJoseph Qi if (ret < 0 && dlm) {
2053190a7721SJoseph Qi if (dlm->master_hash)
2054190a7721SJoseph Qi dlm_free_pagevec((void **)dlm->master_hash,
2055190a7721SJoseph Qi DLM_HASH_PAGES);
2056190a7721SJoseph Qi
2057190a7721SJoseph Qi if (dlm->lockres_hash)
2058190a7721SJoseph Qi dlm_free_pagevec((void **)dlm->lockres_hash,
2059190a7721SJoseph Qi DLM_HASH_PAGES);
2060190a7721SJoseph Qi
2061190a7721SJoseph Qi kfree(dlm->name);
2062190a7721SJoseph Qi kfree(dlm);
2063190a7721SJoseph Qi dlm = NULL;
2064190a7721SJoseph Qi }
20656714d8e8SKurt Hackel return dlm;
20666714d8e8SKurt Hackel }
20676714d8e8SKurt Hackel
20686714d8e8SKurt Hackel /*
2069d24fbcdaSJoel Becker * Compare a requested locking protocol version against the current one.
2070d24fbcdaSJoel Becker *
2071d24fbcdaSJoel Becker * If the major numbers are different, they are incompatible.
2072d24fbcdaSJoel Becker * If the current minor is greater than the request, they are incompatible.
2073d24fbcdaSJoel Becker * If the current minor is less than or equal to the request, they are
2074d24fbcdaSJoel Becker * compatible, and the requester should run at the current minor version.
2075d24fbcdaSJoel Becker */
dlm_protocol_compare(struct dlm_protocol_version * existing,struct dlm_protocol_version * request)2076d24fbcdaSJoel Becker static int dlm_protocol_compare(struct dlm_protocol_version *existing,
2077d24fbcdaSJoel Becker struct dlm_protocol_version *request)
2078d24fbcdaSJoel Becker {
2079d24fbcdaSJoel Becker if (existing->pv_major != request->pv_major)
2080d24fbcdaSJoel Becker return 1;
2081d24fbcdaSJoel Becker
2082d24fbcdaSJoel Becker if (existing->pv_minor > request->pv_minor)
2083d24fbcdaSJoel Becker return 1;
2084d24fbcdaSJoel Becker
2085d24fbcdaSJoel Becker if (existing->pv_minor < request->pv_minor)
2086d24fbcdaSJoel Becker request->pv_minor = existing->pv_minor;
2087d24fbcdaSJoel Becker
2088d24fbcdaSJoel Becker return 0;
2089d24fbcdaSJoel Becker }
2090d24fbcdaSJoel Becker
2091d24fbcdaSJoel Becker /*
2092d24fbcdaSJoel Becker * dlm_register_domain: one-time setup per "domain".
2093d24fbcdaSJoel Becker *
2094d24fbcdaSJoel Becker * The filesystem passes in the requested locking version via proto.
2095d24fbcdaSJoel Becker * If registration was successful, proto will contain the negotiated
2096d24fbcdaSJoel Becker * locking protocol.
20976714d8e8SKurt Hackel */
dlm_register_domain(const char * domain,u32 key,struct dlm_protocol_version * fs_proto)20986714d8e8SKurt Hackel struct dlm_ctxt * dlm_register_domain(const char *domain,
2099d24fbcdaSJoel Becker u32 key,
2100d24fbcdaSJoel Becker struct dlm_protocol_version *fs_proto)
21016714d8e8SKurt Hackel {
21026714d8e8SKurt Hackel int ret;
21036714d8e8SKurt Hackel struct dlm_ctxt *dlm = NULL;
21046714d8e8SKurt Hackel struct dlm_ctxt *new_ctxt = NULL;
21056714d8e8SKurt Hackel
2106e372357bSDan Carpenter if (strlen(domain) >= O2NM_MAX_NAME_LEN) {
21076714d8e8SKurt Hackel ret = -ENAMETOOLONG;
21086714d8e8SKurt Hackel mlog(ML_ERROR, "domain name length too long\n");
21096714d8e8SKurt Hackel goto leave;
21106714d8e8SKurt Hackel }
21116714d8e8SKurt Hackel
21126714d8e8SKurt Hackel mlog(0, "register called for domain \"%s\"\n", domain);
21136714d8e8SKurt Hackel
21146714d8e8SKurt Hackel retry:
21156714d8e8SKurt Hackel dlm = NULL;
21166714d8e8SKurt Hackel if (signal_pending(current)) {
21176714d8e8SKurt Hackel ret = -ERESTARTSYS;
21186714d8e8SKurt Hackel mlog_errno(ret);
21196714d8e8SKurt Hackel goto leave;
21206714d8e8SKurt Hackel }
21216714d8e8SKurt Hackel
21226714d8e8SKurt Hackel spin_lock(&dlm_domain_lock);
21236714d8e8SKurt Hackel
21246714d8e8SKurt Hackel dlm = __dlm_lookup_domain(domain);
21256714d8e8SKurt Hackel if (dlm) {
21266714d8e8SKurt Hackel if (dlm->dlm_state != DLM_CTXT_JOINED) {
21276714d8e8SKurt Hackel spin_unlock(&dlm_domain_lock);
21286714d8e8SKurt Hackel
21296714d8e8SKurt Hackel mlog(0, "This ctxt is not joined yet!\n");
21306714d8e8SKurt Hackel wait_event_interruptible(dlm_domain_events,
21316714d8e8SKurt Hackel dlm_wait_on_domain_helper(
21326714d8e8SKurt Hackel domain));
21336714d8e8SKurt Hackel goto retry;
21346714d8e8SKurt Hackel }
21356714d8e8SKurt Hackel
2136d24fbcdaSJoel Becker if (dlm_protocol_compare(&dlm->fs_locking_proto, fs_proto)) {
21376469272cSJulia Lawall spin_unlock(&dlm_domain_lock);
2138d24fbcdaSJoel Becker mlog(ML_ERROR,
2139d24fbcdaSJoel Becker "Requested locking protocol version is not "
2140d24fbcdaSJoel Becker "compatible with already registered domain "
2141d24fbcdaSJoel Becker "\"%s\"\n", domain);
2142d24fbcdaSJoel Becker ret = -EPROTO;
2143d24fbcdaSJoel Becker goto leave;
2144d24fbcdaSJoel Becker }
2145d24fbcdaSJoel Becker
21466714d8e8SKurt Hackel __dlm_get(dlm);
21476714d8e8SKurt Hackel dlm->num_joins++;
21486714d8e8SKurt Hackel
21496714d8e8SKurt Hackel spin_unlock(&dlm_domain_lock);
21506714d8e8SKurt Hackel
21516714d8e8SKurt Hackel ret = 0;
21526714d8e8SKurt Hackel goto leave;
21536714d8e8SKurt Hackel }
21546714d8e8SKurt Hackel
21556714d8e8SKurt Hackel /* doesn't exist */
21566714d8e8SKurt Hackel if (!new_ctxt) {
21576714d8e8SKurt Hackel spin_unlock(&dlm_domain_lock);
21586714d8e8SKurt Hackel
21596714d8e8SKurt Hackel new_ctxt = dlm_alloc_ctxt(domain, key);
21606714d8e8SKurt Hackel if (new_ctxt)
21616714d8e8SKurt Hackel goto retry;
21626714d8e8SKurt Hackel
21636714d8e8SKurt Hackel ret = -ENOMEM;
21646714d8e8SKurt Hackel mlog_errno(ret);
21656714d8e8SKurt Hackel goto leave;
21666714d8e8SKurt Hackel }
21676714d8e8SKurt Hackel
21686714d8e8SKurt Hackel /* a little variable switch-a-roo here... */
21696714d8e8SKurt Hackel dlm = new_ctxt;
21706714d8e8SKurt Hackel new_ctxt = NULL;
21716714d8e8SKurt Hackel
21726714d8e8SKurt Hackel /* add the new domain */
21736714d8e8SKurt Hackel list_add_tail(&dlm->list, &dlm_domains);
21746714d8e8SKurt Hackel spin_unlock(&dlm_domain_lock);
21756714d8e8SKurt Hackel
2176d24fbcdaSJoel Becker /*
2177d24fbcdaSJoel Becker * Pass the locking protocol version into the join. If the join
2178d24fbcdaSJoel Becker * succeeds, it will have the negotiated protocol set.
2179d24fbcdaSJoel Becker */
2180d24fbcdaSJoel Becker dlm->dlm_locking_proto = dlm_protocol;
2181d24fbcdaSJoel Becker dlm->fs_locking_proto = *fs_proto;
2182d24fbcdaSJoel Becker
21836714d8e8SKurt Hackel ret = dlm_join_domain(dlm);
21846714d8e8SKurt Hackel if (ret) {
21856714d8e8SKurt Hackel mlog_errno(ret);
21866714d8e8SKurt Hackel dlm_put(dlm);
21876714d8e8SKurt Hackel goto leave;
21886714d8e8SKurt Hackel }
21896714d8e8SKurt Hackel
2190d24fbcdaSJoel Becker /* Tell the caller what locking protocol we negotiated */
2191d24fbcdaSJoel Becker *fs_proto = dlm->fs_locking_proto;
2192d24fbcdaSJoel Becker
21936714d8e8SKurt Hackel ret = 0;
21946714d8e8SKurt Hackel leave:
21956714d8e8SKurt Hackel if (new_ctxt)
21966714d8e8SKurt Hackel dlm_free_ctxt_mem(new_ctxt);
21976714d8e8SKurt Hackel
21986714d8e8SKurt Hackel if (ret < 0)
21996714d8e8SKurt Hackel dlm = ERR_PTR(ret);
22006714d8e8SKurt Hackel
22016714d8e8SKurt Hackel return dlm;
22026714d8e8SKurt Hackel }
22036714d8e8SKurt Hackel EXPORT_SYMBOL_GPL(dlm_register_domain);
22046714d8e8SKurt Hackel
22056714d8e8SKurt Hackel static LIST_HEAD(dlm_join_handlers);
22066714d8e8SKurt Hackel
dlm_unregister_net_handlers(void)22076714d8e8SKurt Hackel static void dlm_unregister_net_handlers(void)
22086714d8e8SKurt Hackel {
22096714d8e8SKurt Hackel o2net_unregister_handler_list(&dlm_join_handlers);
22106714d8e8SKurt Hackel }
22116714d8e8SKurt Hackel
dlm_register_net_handlers(void)22126714d8e8SKurt Hackel static int dlm_register_net_handlers(void)
22136714d8e8SKurt Hackel {
22146714d8e8SKurt Hackel int status = 0;
22156714d8e8SKurt Hackel
22166714d8e8SKurt Hackel status = o2net_register_handler(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY,
22176714d8e8SKurt Hackel sizeof(struct dlm_query_join_request),
22186714d8e8SKurt Hackel dlm_query_join_handler,
2219d74c9803SKurt Hackel NULL, NULL, &dlm_join_handlers);
22206714d8e8SKurt Hackel if (status)
22216714d8e8SKurt Hackel goto bail;
22226714d8e8SKurt Hackel
22236714d8e8SKurt Hackel status = o2net_register_handler(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY,
22246714d8e8SKurt Hackel sizeof(struct dlm_assert_joined),
22256714d8e8SKurt Hackel dlm_assert_joined_handler,
2226d74c9803SKurt Hackel NULL, NULL, &dlm_join_handlers);
22276714d8e8SKurt Hackel if (status)
22286714d8e8SKurt Hackel goto bail;
22296714d8e8SKurt Hackel
22306714d8e8SKurt Hackel status = o2net_register_handler(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY,
22316714d8e8SKurt Hackel sizeof(struct dlm_cancel_join),
22326714d8e8SKurt Hackel dlm_cancel_join_handler,
2233d74c9803SKurt Hackel NULL, NULL, &dlm_join_handlers);
2234ea203441SSunil Mushran if (status)
2235ea203441SSunil Mushran goto bail;
2236ea203441SSunil Mushran
2237ea203441SSunil Mushran status = o2net_register_handler(DLM_QUERY_REGION, DLM_MOD_KEY,
2238ea203441SSunil Mushran sizeof(struct dlm_query_region),
2239ea203441SSunil Mushran dlm_query_region_handler,
2240ea203441SSunil Mushran NULL, NULL, &dlm_join_handlers);
22416714d8e8SKurt Hackel
224218cfdf1bSSunil Mushran if (status)
224318cfdf1bSSunil Mushran goto bail;
224418cfdf1bSSunil Mushran
224518cfdf1bSSunil Mushran status = o2net_register_handler(DLM_QUERY_NODEINFO, DLM_MOD_KEY,
224618cfdf1bSSunil Mushran sizeof(struct dlm_query_nodeinfo),
224718cfdf1bSSunil Mushran dlm_query_nodeinfo_handler,
224818cfdf1bSSunil Mushran NULL, NULL, &dlm_join_handlers);
22496714d8e8SKurt Hackel bail:
22506714d8e8SKurt Hackel if (status < 0)
22516714d8e8SKurt Hackel dlm_unregister_net_handlers();
22526714d8e8SKurt Hackel
22536714d8e8SKurt Hackel return status;
22546714d8e8SKurt Hackel }
22556714d8e8SKurt Hackel
22566714d8e8SKurt Hackel /* Domain eviction callback handling.
22576714d8e8SKurt Hackel *
22586714d8e8SKurt Hackel * The file system requires notification of node death *before* the
22596714d8e8SKurt Hackel * dlm completes it's recovery work, otherwise it may be able to
22606714d8e8SKurt Hackel * acquire locks on resources requiring recovery. Since the dlm can
22616714d8e8SKurt Hackel * evict a node from it's domain *before* heartbeat fires, a similar
22626714d8e8SKurt Hackel * mechanism is required. */
22636714d8e8SKurt Hackel
22646714d8e8SKurt Hackel /* Eviction is not expected to happen often, so a per-domain lock is
22656714d8e8SKurt Hackel * not necessary. Eviction callbacks are allowed to sleep for short
22666714d8e8SKurt Hackel * periods of time. */
22676714d8e8SKurt Hackel static DECLARE_RWSEM(dlm_callback_sem);
22686714d8e8SKurt Hackel
dlm_fire_domain_eviction_callbacks(struct dlm_ctxt * dlm,int node_num)22696714d8e8SKurt Hackel void dlm_fire_domain_eviction_callbacks(struct dlm_ctxt *dlm,
22706714d8e8SKurt Hackel int node_num)
22716714d8e8SKurt Hackel {
22726714d8e8SKurt Hackel struct dlm_eviction_cb *cb;
22736714d8e8SKurt Hackel
22746714d8e8SKurt Hackel down_read(&dlm_callback_sem);
2275df53cd3bSDong Fang list_for_each_entry(cb, &dlm->dlm_eviction_callbacks, ec_item) {
22766714d8e8SKurt Hackel cb->ec_func(node_num, cb->ec_data);
22776714d8e8SKurt Hackel }
22786714d8e8SKurt Hackel up_read(&dlm_callback_sem);
22796714d8e8SKurt Hackel }
22806714d8e8SKurt Hackel
dlm_setup_eviction_cb(struct dlm_eviction_cb * cb,dlm_eviction_func * f,void * data)22816714d8e8SKurt Hackel void dlm_setup_eviction_cb(struct dlm_eviction_cb *cb,
22826714d8e8SKurt Hackel dlm_eviction_func *f,
22836714d8e8SKurt Hackel void *data)
22846714d8e8SKurt Hackel {
22856714d8e8SKurt Hackel INIT_LIST_HEAD(&cb->ec_item);
22866714d8e8SKurt Hackel cb->ec_func = f;
22876714d8e8SKurt Hackel cb->ec_data = data;
22886714d8e8SKurt Hackel }
22896714d8e8SKurt Hackel EXPORT_SYMBOL_GPL(dlm_setup_eviction_cb);
22906714d8e8SKurt Hackel
dlm_register_eviction_cb(struct dlm_ctxt * dlm,struct dlm_eviction_cb * cb)22916714d8e8SKurt Hackel void dlm_register_eviction_cb(struct dlm_ctxt *dlm,
22926714d8e8SKurt Hackel struct dlm_eviction_cb *cb)
22936714d8e8SKurt Hackel {
22946714d8e8SKurt Hackel down_write(&dlm_callback_sem);
22956714d8e8SKurt Hackel list_add_tail(&cb->ec_item, &dlm->dlm_eviction_callbacks);
22966714d8e8SKurt Hackel up_write(&dlm_callback_sem);
22976714d8e8SKurt Hackel }
22986714d8e8SKurt Hackel EXPORT_SYMBOL_GPL(dlm_register_eviction_cb);
22996714d8e8SKurt Hackel
dlm_unregister_eviction_cb(struct dlm_eviction_cb * cb)23006714d8e8SKurt Hackel void dlm_unregister_eviction_cb(struct dlm_eviction_cb *cb)
23016714d8e8SKurt Hackel {
23026714d8e8SKurt Hackel down_write(&dlm_callback_sem);
23036714d8e8SKurt Hackel list_del_init(&cb->ec_item);
23046714d8e8SKurt Hackel up_write(&dlm_callback_sem);
23056714d8e8SKurt Hackel }
23066714d8e8SKurt Hackel EXPORT_SYMBOL_GPL(dlm_unregister_eviction_cb);
23076714d8e8SKurt Hackel
dlm_init(void)23086714d8e8SKurt Hackel static int __init dlm_init(void)
23096714d8e8SKurt Hackel {
23106714d8e8SKurt Hackel int status;
23116714d8e8SKurt Hackel
23126714d8e8SKurt Hackel status = dlm_init_mle_cache();
231312eb0035SSunil Mushran if (status) {
231412eb0035SSunil Mushran mlog(ML_ERROR, "Could not create o2dlm_mle slabcache\n");
2315724bdca9SSunil Mushran goto error;
2316724bdca9SSunil Mushran }
2317724bdca9SSunil Mushran
2318724bdca9SSunil Mushran status = dlm_init_master_caches();
2319724bdca9SSunil Mushran if (status) {
2320724bdca9SSunil Mushran mlog(ML_ERROR, "Could not create o2dlm_lockres and "
2321724bdca9SSunil Mushran "o2dlm_lockname slabcaches\n");
2322724bdca9SSunil Mushran goto error;
2323724bdca9SSunil Mushran }
2324724bdca9SSunil Mushran
2325724bdca9SSunil Mushran status = dlm_init_lock_cache();
2326724bdca9SSunil Mushran if (status) {
2327724bdca9SSunil Mushran mlog(ML_ERROR, "Count not create o2dlm_lock slabcache\n");
2328724bdca9SSunil Mushran goto error;
232912eb0035SSunil Mushran }
23306714d8e8SKurt Hackel
23316714d8e8SKurt Hackel status = dlm_register_net_handlers();
23326714d8e8SKurt Hackel if (status) {
2333724bdca9SSunil Mushran mlog(ML_ERROR, "Unable to register network handlers\n");
2334724bdca9SSunil Mushran goto error;
23356714d8e8SKurt Hackel }
23366714d8e8SKurt Hackel
2337e581595eSGreg Kroah-Hartman dlm_create_debugfs_root();
23386325b4a2SSunil Mushran
23396714d8e8SKurt Hackel return 0;
2340724bdca9SSunil Mushran error:
23416325b4a2SSunil Mushran dlm_unregister_net_handlers();
2342724bdca9SSunil Mushran dlm_destroy_lock_cache();
2343724bdca9SSunil Mushran dlm_destroy_master_caches();
2344724bdca9SSunil Mushran dlm_destroy_mle_cache();
2345724bdca9SSunil Mushran return -1;
23466714d8e8SKurt Hackel }
23476714d8e8SKurt Hackel
dlm_exit(void)23486714d8e8SKurt Hackel static void __exit dlm_exit (void)
23496714d8e8SKurt Hackel {
23506325b4a2SSunil Mushran dlm_destroy_debugfs_root();
23516714d8e8SKurt Hackel dlm_unregister_net_handlers();
2352724bdca9SSunil Mushran dlm_destroy_lock_cache();
2353724bdca9SSunil Mushran dlm_destroy_master_caches();
23546714d8e8SKurt Hackel dlm_destroy_mle_cache();
23556714d8e8SKurt Hackel }
23566714d8e8SKurt Hackel
23576714d8e8SKurt Hackel MODULE_AUTHOR("Oracle");
23586714d8e8SKurt Hackel MODULE_LICENSE("GPL");
2359ff8fb335SGoldwyn Rodrigues MODULE_DESCRIPTION("OCFS2 Distributed Lock Management");
23606714d8e8SKurt Hackel
23616714d8e8SKurt Hackel module_init(dlm_init);
23626714d8e8SKurt Hackel module_exit(dlm_exit);
2363