// SPDX-License-Identifier: GPL-2.0-or-later
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/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* dlmdomain.c
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*
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* defines domain join / leave apis
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*
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* Copyright (C) 2004 Oracle. All rights reserved.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/highmem.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/debugfs.h>
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#include <linux/sched/signal.h>
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#include "../cluster/heartbeat.h"
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#include "../cluster/nodemanager.h"
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#include "../cluster/tcp.h"
|
|
#include "dlmapi.h"
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#include "dlmcommon.h"
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#include "dlmdomain.h"
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#include "dlmdebug.h"
|
|
#define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_DOMAIN)
|
#include "../cluster/masklog.h"
|
|
/*
|
* ocfs2 node maps are array of long int, which limits to send them freely
|
* across the wire due to endianness issues. To workaround this, we convert
|
* long ints to byte arrays. Following 3 routines are helper functions to
|
* set/test/copy bits within those array of bytes
|
*/
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static inline void byte_set_bit(u8 nr, u8 map[])
|
{
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map[nr >> 3] |= (1UL << (nr & 7));
|
}
|
|
static inline int byte_test_bit(u8 nr, u8 map[])
|
{
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return ((1UL << (nr & 7)) & (map[nr >> 3])) != 0;
|
}
|
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static inline void byte_copymap(u8 dmap[], unsigned long smap[],
|
unsigned int sz)
|
{
|
unsigned int nn;
|
|
if (!sz)
|
return;
|
|
memset(dmap, 0, ((sz + 7) >> 3));
|
for (nn = 0 ; nn < sz; nn++)
|
if (test_bit(nn, smap))
|
byte_set_bit(nn, dmap);
|
}
|
|
static void dlm_free_pagevec(void **vec, int pages)
|
{
|
while (pages--)
|
free_page((unsigned long)vec[pages]);
|
kfree(vec);
|
}
|
|
static void **dlm_alloc_pagevec(int pages)
|
{
|
void **vec = kmalloc_array(pages, sizeof(void *), GFP_KERNEL);
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int i;
|
|
if (!vec)
|
return NULL;
|
|
for (i = 0; i < pages; i++)
|
if (!(vec[i] = (void *)__get_free_page(GFP_KERNEL)))
|
goto out_free;
|
|
mlog(0, "Allocated DLM hash pagevec; %d pages (%lu expected), %lu buckets per page\n",
|
pages, (unsigned long)DLM_HASH_PAGES,
|
(unsigned long)DLM_BUCKETS_PER_PAGE);
|
return vec;
|
out_free:
|
dlm_free_pagevec(vec, i);
|
return NULL;
|
}
|
|
/*
|
*
|
* spinlock lock ordering: if multiple locks are needed, obey this ordering:
|
* dlm_domain_lock
|
* struct dlm_ctxt->spinlock
|
* struct dlm_lock_resource->spinlock
|
* struct dlm_ctxt->master_lock
|
* struct dlm_ctxt->ast_lock
|
* dlm_master_list_entry->spinlock
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* dlm_lock->spinlock
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*
|
*/
|
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DEFINE_SPINLOCK(dlm_domain_lock);
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LIST_HEAD(dlm_domains);
|
static DECLARE_WAIT_QUEUE_HEAD(dlm_domain_events);
|
|
/*
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* The supported protocol version for DLM communication. Running domains
|
* will have a negotiated version with the same major number and a minor
|
* number equal or smaller. The dlm_ctxt->dlm_locking_proto field should
|
* be used to determine what a running domain is actually using.
|
*
|
* New in version 1.1:
|
* - Message DLM_QUERY_REGION added to support global heartbeat
|
* - Message DLM_QUERY_NODEINFO added to allow online node removes
|
* New in version 1.2:
|
* - Message DLM_BEGIN_EXIT_DOMAIN_MSG added to mark start of exit domain
|
* New in version 1.3:
|
* - Message DLM_DEREF_LOCKRES_DONE added to inform non-master that the
|
* refmap is cleared
|
*/
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static const struct dlm_protocol_version dlm_protocol = {
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.pv_major = 1,
|
.pv_minor = 3,
|
};
|
|
#define DLM_DOMAIN_BACKOFF_MS 200
|
|
static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data,
|
void **ret_data);
|
static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data,
|
void **ret_data);
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static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data,
|
void **ret_data);
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static int dlm_query_region_handler(struct o2net_msg *msg, u32 len,
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void *data, void **ret_data);
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static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data,
|
void **ret_data);
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static int dlm_protocol_compare(struct dlm_protocol_version *existing,
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struct dlm_protocol_version *request);
|
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static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm);
|
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void __dlm_unhash_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res)
|
{
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if (hlist_unhashed(&res->hash_node))
|
return;
|
|
mlog(0, "%s: Unhash res %.*s\n", dlm->name, res->lockname.len,
|
res->lockname.name);
|
hlist_del_init(&res->hash_node);
|
dlm_lockres_put(res);
|
}
|
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void __dlm_insert_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res)
|
{
|
struct hlist_head *bucket;
|
|
assert_spin_locked(&dlm->spinlock);
|
|
bucket = dlm_lockres_hash(dlm, res->lockname.hash);
|
|
/* get a reference for our hashtable */
|
dlm_lockres_get(res);
|
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hlist_add_head(&res->hash_node, bucket);
|
|
mlog(0, "%s: Hash res %.*s\n", dlm->name, res->lockname.len,
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res->lockname.name);
|
}
|
|
struct dlm_lock_resource * __dlm_lookup_lockres_full(struct dlm_ctxt *dlm,
|
const char *name,
|
unsigned int len,
|
unsigned int hash)
|
{
|
struct hlist_head *bucket;
|
struct dlm_lock_resource *res;
|
|
mlog(0, "%.*s\n", len, name);
|
|
assert_spin_locked(&dlm->spinlock);
|
|
bucket = dlm_lockres_hash(dlm, hash);
|
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hlist_for_each_entry(res, bucket, hash_node) {
|
if (res->lockname.name[0] != name[0])
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continue;
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if (unlikely(res->lockname.len != len))
|
continue;
|
if (memcmp(res->lockname.name + 1, name + 1, len - 1))
|
continue;
|
dlm_lockres_get(res);
|
return res;
|
}
|
return NULL;
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}
|
|
/* intended to be called by functions which do not care about lock
|
* resources which are being purged (most net _handler functions).
|
* this will return NULL for any lock resource which is found but
|
* currently in the process of dropping its mastery reference.
|
* use __dlm_lookup_lockres_full when you need the lock resource
|
* regardless (e.g. dlm_get_lock_resource) */
|
struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm,
|
const char *name,
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unsigned int len,
|
unsigned int hash)
|
{
|
struct dlm_lock_resource *res = NULL;
|
|
mlog(0, "%.*s\n", len, name);
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assert_spin_locked(&dlm->spinlock);
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res = __dlm_lookup_lockres_full(dlm, name, len, hash);
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if (res) {
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spin_lock(&res->spinlock);
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if (res->state & DLM_LOCK_RES_DROPPING_REF) {
|
spin_unlock(&res->spinlock);
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dlm_lockres_put(res);
|
return NULL;
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}
|
spin_unlock(&res->spinlock);
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}
|
|
return res;
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}
|
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struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm,
|
const char *name,
|
unsigned int len)
|
{
|
struct dlm_lock_resource *res;
|
unsigned int hash = dlm_lockid_hash(name, len);
|
|
spin_lock(&dlm->spinlock);
|
res = __dlm_lookup_lockres(dlm, name, len, hash);
|
spin_unlock(&dlm->spinlock);
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return res;
|
}
|
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static struct dlm_ctxt * __dlm_lookup_domain_full(const char *domain, int len)
|
{
|
struct dlm_ctxt *tmp;
|
|
assert_spin_locked(&dlm_domain_lock);
|
|
/* tmp->name here is always NULL terminated,
|
* but domain may not be! */
|
list_for_each_entry(tmp, &dlm_domains, list) {
|
if (strlen(tmp->name) == len &&
|
memcmp(tmp->name, domain, len)==0)
|
return tmp;
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}
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|
return NULL;
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}
|
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/* For null terminated domain strings ONLY */
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static struct dlm_ctxt * __dlm_lookup_domain(const char *domain)
|
{
|
assert_spin_locked(&dlm_domain_lock);
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return __dlm_lookup_domain_full(domain, strlen(domain));
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}
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|
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/* returns true on one of two conditions:
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* 1) the domain does not exist
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* 2) the domain exists and it's state is "joined" */
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static int dlm_wait_on_domain_helper(const char *domain)
|
{
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int ret = 0;
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struct dlm_ctxt *tmp = NULL;
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spin_lock(&dlm_domain_lock);
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tmp = __dlm_lookup_domain(domain);
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if (!tmp)
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ret = 1;
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else if (tmp->dlm_state == DLM_CTXT_JOINED)
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ret = 1;
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spin_unlock(&dlm_domain_lock);
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return ret;
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}
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static void dlm_free_ctxt_mem(struct dlm_ctxt *dlm)
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{
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dlm_destroy_debugfs_subroot(dlm);
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if (dlm->lockres_hash)
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dlm_free_pagevec((void **)dlm->lockres_hash, DLM_HASH_PAGES);
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if (dlm->master_hash)
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dlm_free_pagevec((void **)dlm->master_hash, DLM_HASH_PAGES);
|
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kfree(dlm->name);
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kfree(dlm);
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}
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/* A little strange - this function will be called while holding
|
* dlm_domain_lock and is expected to be holding it on the way out. We
|
* will however drop and reacquire it multiple times */
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static void dlm_ctxt_release(struct kref *kref)
|
{
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struct dlm_ctxt *dlm;
|
|
dlm = container_of(kref, struct dlm_ctxt, dlm_refs);
|
|
BUG_ON(dlm->num_joins);
|
BUG_ON(dlm->dlm_state == DLM_CTXT_JOINED);
|
|
/* we may still be in the list if we hit an error during join. */
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list_del_init(&dlm->list);
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spin_unlock(&dlm_domain_lock);
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mlog(0, "freeing memory from domain %s\n", dlm->name);
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|
wake_up(&dlm_domain_events);
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dlm_free_ctxt_mem(dlm);
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|
spin_lock(&dlm_domain_lock);
|
}
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void dlm_put(struct dlm_ctxt *dlm)
|
{
|
spin_lock(&dlm_domain_lock);
|
kref_put(&dlm->dlm_refs, dlm_ctxt_release);
|
spin_unlock(&dlm_domain_lock);
|
}
|
|
static void __dlm_get(struct dlm_ctxt *dlm)
|
{
|
kref_get(&dlm->dlm_refs);
|
}
|
|
/* given a questionable reference to a dlm object, gets a reference if
|
* it can find it in the list, otherwise returns NULL in which case
|
* you shouldn't trust your pointer. */
|
struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm)
|
{
|
struct dlm_ctxt *target;
|
struct dlm_ctxt *ret = NULL;
|
|
spin_lock(&dlm_domain_lock);
|
|
list_for_each_entry(target, &dlm_domains, list) {
|
if (target == dlm) {
|
__dlm_get(target);
|
ret = target;
|
break;
|
}
|
}
|
|
spin_unlock(&dlm_domain_lock);
|
|
return ret;
|
}
|
|
int dlm_domain_fully_joined(struct dlm_ctxt *dlm)
|
{
|
int ret;
|
|
spin_lock(&dlm_domain_lock);
|
ret = (dlm->dlm_state == DLM_CTXT_JOINED) ||
|
(dlm->dlm_state == DLM_CTXT_IN_SHUTDOWN);
|
spin_unlock(&dlm_domain_lock);
|
|
return ret;
|
}
|
|
static void dlm_destroy_dlm_worker(struct dlm_ctxt *dlm)
|
{
|
if (dlm->dlm_worker) {
|
destroy_workqueue(dlm->dlm_worker);
|
dlm->dlm_worker = NULL;
|
}
|
}
|
|
static void dlm_complete_dlm_shutdown(struct dlm_ctxt *dlm)
|
{
|
dlm_unregister_domain_handlers(dlm);
|
dlm_complete_thread(dlm);
|
dlm_complete_recovery_thread(dlm);
|
dlm_destroy_dlm_worker(dlm);
|
|
/* We've left the domain. Now we can take ourselves out of the
|
* list and allow the kref stuff to help us free the
|
* memory. */
|
spin_lock(&dlm_domain_lock);
|
list_del_init(&dlm->list);
|
spin_unlock(&dlm_domain_lock);
|
|
/* Wake up anyone waiting for us to remove this domain */
|
wake_up(&dlm_domain_events);
|
}
|
|
static int dlm_migrate_all_locks(struct dlm_ctxt *dlm)
|
{
|
int i, num, n, ret = 0;
|
struct dlm_lock_resource *res;
|
struct hlist_node *iter;
|
struct hlist_head *bucket;
|
int dropped;
|
|
mlog(0, "Migrating locks from domain %s\n", dlm->name);
|
|
num = 0;
|
spin_lock(&dlm->spinlock);
|
for (i = 0; i < DLM_HASH_BUCKETS; i++) {
|
redo_bucket:
|
n = 0;
|
bucket = dlm_lockres_hash(dlm, i);
|
iter = bucket->first;
|
while (iter) {
|
n++;
|
res = hlist_entry(iter, struct dlm_lock_resource,
|
hash_node);
|
dlm_lockres_get(res);
|
/* migrate, if necessary. this will drop the dlm
|
* spinlock and retake it if it does migration. */
|
dropped = dlm_empty_lockres(dlm, res);
|
|
spin_lock(&res->spinlock);
|
if (dropped)
|
__dlm_lockres_calc_usage(dlm, res);
|
else
|
iter = res->hash_node.next;
|
spin_unlock(&res->spinlock);
|
|
dlm_lockres_put(res);
|
|
if (dropped) {
|
cond_resched_lock(&dlm->spinlock);
|
goto redo_bucket;
|
}
|
}
|
cond_resched_lock(&dlm->spinlock);
|
num += n;
|
}
|
|
if (!num) {
|
if (dlm->reco.state & DLM_RECO_STATE_ACTIVE) {
|
mlog(0, "%s: perhaps there are more lock resources "
|
"need to be migrated after dlm recovery\n", dlm->name);
|
ret = -EAGAIN;
|
} else {
|
mlog(0, "%s: we won't do dlm recovery after migrating "
|
"all lock resources\n", dlm->name);
|
dlm->migrate_done = 1;
|
}
|
}
|
|
spin_unlock(&dlm->spinlock);
|
wake_up(&dlm->dlm_thread_wq);
|
|
/* let the dlm thread take care of purging, keep scanning until
|
* nothing remains in the hash */
|
if (num) {
|
mlog(0, "%s: %d lock resources in hash last pass\n",
|
dlm->name, num);
|
ret = -EAGAIN;
|
}
|
mlog(0, "DONE Migrating locks from domain %s\n", dlm->name);
|
return ret;
|
}
|
|
static int dlm_no_joining_node(struct dlm_ctxt *dlm)
|
{
|
int ret;
|
|
spin_lock(&dlm->spinlock);
|
ret = dlm->joining_node == DLM_LOCK_RES_OWNER_UNKNOWN;
|
spin_unlock(&dlm->spinlock);
|
|
return ret;
|
}
|
|
static int dlm_begin_exit_domain_handler(struct o2net_msg *msg, u32 len,
|
void *data, void **ret_data)
|
{
|
struct dlm_ctxt *dlm = data;
|
unsigned int node;
|
struct dlm_exit_domain *exit_msg = (struct dlm_exit_domain *) msg->buf;
|
|
if (!dlm_grab(dlm))
|
return 0;
|
|
node = exit_msg->node_idx;
|
mlog(0, "%s: Node %u sent a begin exit domain message\n", dlm->name, node);
|
|
spin_lock(&dlm->spinlock);
|
set_bit(node, dlm->exit_domain_map);
|
spin_unlock(&dlm->spinlock);
|
|
dlm_put(dlm);
|
|
return 0;
|
}
|
|
static void dlm_mark_domain_leaving(struct dlm_ctxt *dlm)
|
{
|
/* Yikes, a double spinlock! I need domain_lock for the dlm
|
* state and the dlm spinlock for join state... Sorry! */
|
again:
|
spin_lock(&dlm_domain_lock);
|
spin_lock(&dlm->spinlock);
|
|
if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) {
|
mlog(0, "Node %d is joining, we wait on it.\n",
|
dlm->joining_node);
|
spin_unlock(&dlm->spinlock);
|
spin_unlock(&dlm_domain_lock);
|
|
wait_event(dlm->dlm_join_events, dlm_no_joining_node(dlm));
|
goto again;
|
}
|
|
dlm->dlm_state = DLM_CTXT_LEAVING;
|
spin_unlock(&dlm->spinlock);
|
spin_unlock(&dlm_domain_lock);
|
}
|
|
static void __dlm_print_nodes(struct dlm_ctxt *dlm)
|
{
|
int node = -1, num = 0;
|
|
assert_spin_locked(&dlm->spinlock);
|
|
printk("( ");
|
while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES,
|
node + 1)) < O2NM_MAX_NODES) {
|
printk("%d ", node);
|
++num;
|
}
|
printk(") %u nodes\n", num);
|
}
|
|
static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data,
|
void **ret_data)
|
{
|
struct dlm_ctxt *dlm = data;
|
unsigned int node;
|
struct dlm_exit_domain *exit_msg = (struct dlm_exit_domain *) msg->buf;
|
|
mlog(0, "%p %u %p", msg, len, data);
|
|
if (!dlm_grab(dlm))
|
return 0;
|
|
node = exit_msg->node_idx;
|
|
spin_lock(&dlm->spinlock);
|
clear_bit(node, dlm->domain_map);
|
clear_bit(node, dlm->exit_domain_map);
|
printk(KERN_NOTICE "o2dlm: Node %u leaves domain %s ", node, dlm->name);
|
__dlm_print_nodes(dlm);
|
|
/* notify anything attached to the heartbeat events */
|
dlm_hb_event_notify_attached(dlm, node, 0);
|
|
spin_unlock(&dlm->spinlock);
|
|
dlm_put(dlm);
|
|
return 0;
|
}
|
|
static int dlm_send_one_domain_exit(struct dlm_ctxt *dlm, u32 msg_type,
|
unsigned int node)
|
{
|
int status;
|
struct dlm_exit_domain leave_msg;
|
|
mlog(0, "%s: Sending domain exit message %u to node %u\n", dlm->name,
|
msg_type, node);
|
|
memset(&leave_msg, 0, sizeof(leave_msg));
|
leave_msg.node_idx = dlm->node_num;
|
|
status = o2net_send_message(msg_type, dlm->key, &leave_msg,
|
sizeof(leave_msg), node, NULL);
|
if (status < 0)
|
mlog(ML_ERROR, "Error %d sending domain exit message %u "
|
"to node %u on domain %s\n", status, msg_type, node,
|
dlm->name);
|
|
return status;
|
}
|
|
static void dlm_begin_exit_domain(struct dlm_ctxt *dlm)
|
{
|
int node = -1;
|
|
/* Support for begin exit domain was added in 1.2 */
|
if (dlm->dlm_locking_proto.pv_major == 1 &&
|
dlm->dlm_locking_proto.pv_minor < 2)
|
return;
|
|
/*
|
* Unlike DLM_EXIT_DOMAIN_MSG, DLM_BEGIN_EXIT_DOMAIN_MSG is purely
|
* informational. Meaning if a node does not receive the message,
|
* so be it.
|
*/
|
spin_lock(&dlm->spinlock);
|
while (1) {
|
node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES, node + 1);
|
if (node >= O2NM_MAX_NODES)
|
break;
|
if (node == dlm->node_num)
|
continue;
|
|
spin_unlock(&dlm->spinlock);
|
dlm_send_one_domain_exit(dlm, DLM_BEGIN_EXIT_DOMAIN_MSG, node);
|
spin_lock(&dlm->spinlock);
|
}
|
spin_unlock(&dlm->spinlock);
|
}
|
|
static void dlm_leave_domain(struct dlm_ctxt *dlm)
|
{
|
int node, clear_node, status;
|
|
/* At this point we've migrated away all our locks and won't
|
* accept mastership of new ones. The dlm is responsible for
|
* almost nothing now. We make sure not to confuse any joining
|
* nodes and then commence shutdown procedure. */
|
|
spin_lock(&dlm->spinlock);
|
/* Clear ourselves from the domain map */
|
clear_bit(dlm->node_num, dlm->domain_map);
|
while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES,
|
0)) < O2NM_MAX_NODES) {
|
/* Drop the dlm spinlock. This is safe wrt the domain_map.
|
* -nodes cannot be added now as the
|
* query_join_handlers knows to respond with OK_NO_MAP
|
* -we catch the right network errors if a node is
|
* removed from the map while we're sending him the
|
* exit message. */
|
spin_unlock(&dlm->spinlock);
|
|
clear_node = 1;
|
|
status = dlm_send_one_domain_exit(dlm, DLM_EXIT_DOMAIN_MSG,
|
node);
|
if (status < 0 &&
|
status != -ENOPROTOOPT &&
|
status != -ENOTCONN) {
|
mlog(ML_NOTICE, "Error %d sending domain exit message "
|
"to node %d\n", status, node);
|
|
/* Not sure what to do here but lets sleep for
|
* a bit in case this was a transient
|
* error... */
|
msleep(DLM_DOMAIN_BACKOFF_MS);
|
clear_node = 0;
|
}
|
|
spin_lock(&dlm->spinlock);
|
/* If we're not clearing the node bit then we intend
|
* to loop back around to try again. */
|
if (clear_node)
|
clear_bit(node, dlm->domain_map);
|
}
|
spin_unlock(&dlm->spinlock);
|
}
|
|
void dlm_unregister_domain(struct dlm_ctxt *dlm)
|
{
|
int leave = 0;
|
struct dlm_lock_resource *res;
|
|
spin_lock(&dlm_domain_lock);
|
BUG_ON(dlm->dlm_state != DLM_CTXT_JOINED);
|
BUG_ON(!dlm->num_joins);
|
|
dlm->num_joins--;
|
if (!dlm->num_joins) {
|
/* We mark it "in shutdown" now so new register
|
* requests wait until we've completely left the
|
* domain. Don't use DLM_CTXT_LEAVING yet as we still
|
* want new domain joins to communicate with us at
|
* least until we've completed migration of our
|
* resources. */
|
dlm->dlm_state = DLM_CTXT_IN_SHUTDOWN;
|
leave = 1;
|
}
|
spin_unlock(&dlm_domain_lock);
|
|
if (leave) {
|
mlog(0, "shutting down domain %s\n", dlm->name);
|
dlm_begin_exit_domain(dlm);
|
|
/* We changed dlm state, notify the thread */
|
dlm_kick_thread(dlm, NULL);
|
|
while (dlm_migrate_all_locks(dlm)) {
|
/* Give dlm_thread time to purge the lockres' */
|
msleep(500);
|
mlog(0, "%s: more migration to do\n", dlm->name);
|
}
|
|
/* This list should be empty. If not, print remaining lockres */
|
if (!list_empty(&dlm->tracking_list)) {
|
mlog(ML_ERROR, "Following lockres' are still on the "
|
"tracking list:\n");
|
list_for_each_entry(res, &dlm->tracking_list, tracking)
|
dlm_print_one_lock_resource(res);
|
}
|
|
dlm_mark_domain_leaving(dlm);
|
dlm_leave_domain(dlm);
|
printk(KERN_NOTICE "o2dlm: Leaving domain %s\n", dlm->name);
|
dlm_force_free_mles(dlm);
|
dlm_complete_dlm_shutdown(dlm);
|
}
|
dlm_put(dlm);
|
}
|
EXPORT_SYMBOL_GPL(dlm_unregister_domain);
|
|
static int dlm_query_join_proto_check(char *proto_type, int node,
|
struct dlm_protocol_version *ours,
|
struct dlm_protocol_version *request)
|
{
|
int rc;
|
struct dlm_protocol_version proto = *request;
|
|
if (!dlm_protocol_compare(ours, &proto)) {
|
mlog(0,
|
"node %u wanted to join with %s locking protocol "
|
"%u.%u, we respond with %u.%u\n",
|
node, proto_type,
|
request->pv_major,
|
request->pv_minor,
|
proto.pv_major, proto.pv_minor);
|
request->pv_minor = proto.pv_minor;
|
rc = 0;
|
} else {
|
mlog(ML_NOTICE,
|
"Node %u wanted to join with %s locking "
|
"protocol %u.%u, but we have %u.%u, disallowing\n",
|
node, proto_type,
|
request->pv_major,
|
request->pv_minor,
|
ours->pv_major,
|
ours->pv_minor);
|
rc = 1;
|
}
|
|
return rc;
|
}
|
|
/*
|
* struct dlm_query_join_packet is made up of four one-byte fields. They
|
* are effectively in big-endian order already. However, little-endian
|
* machines swap them before putting the packet on the wire (because
|
* query_join's response is a status, and that status is treated as a u32
|
* on the wire). Thus, a big-endian and little-endian machines will treat
|
* this structure differently.
|
*
|
* The solution is to have little-endian machines swap the structure when
|
* converting from the structure to the u32 representation. This will
|
* result in the structure having the correct format on the wire no matter
|
* the host endian format.
|
*/
|
static void dlm_query_join_packet_to_wire(struct dlm_query_join_packet *packet,
|
u32 *wire)
|
{
|
union dlm_query_join_response response;
|
|
response.packet = *packet;
|
*wire = be32_to_cpu(response.intval);
|
}
|
|
static void dlm_query_join_wire_to_packet(u32 wire,
|
struct dlm_query_join_packet *packet)
|
{
|
union dlm_query_join_response response;
|
|
response.intval = cpu_to_be32(wire);
|
*packet = response.packet;
|
}
|
|
static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data,
|
void **ret_data)
|
{
|
struct dlm_query_join_request *query;
|
struct dlm_query_join_packet packet = {
|
.code = JOIN_DISALLOW,
|
};
|
struct dlm_ctxt *dlm = NULL;
|
u32 response;
|
u8 nodenum;
|
|
query = (struct dlm_query_join_request *) msg->buf;
|
|
mlog(0, "node %u wants to join domain %s\n", query->node_idx,
|
query->domain);
|
|
/*
|
* If heartbeat doesn't consider the node live, tell it
|
* to back off and try again. This gives heartbeat a chance
|
* to catch up.
|
*/
|
if (!o2hb_check_node_heartbeating_no_sem(query->node_idx)) {
|
mlog(0, "node %u is not in our live map yet\n",
|
query->node_idx);
|
|
packet.code = JOIN_DISALLOW;
|
goto respond;
|
}
|
|
packet.code = JOIN_OK_NO_MAP;
|
|
spin_lock(&dlm_domain_lock);
|
dlm = __dlm_lookup_domain_full(query->domain, query->name_len);
|
if (!dlm)
|
goto unlock_respond;
|
|
/*
|
* There is a small window where the joining node may not see the
|
* node(s) that just left but still part of the cluster. DISALLOW
|
* join request if joining node has different node map.
|
*/
|
nodenum=0;
|
while (nodenum < O2NM_MAX_NODES) {
|
if (test_bit(nodenum, dlm->domain_map)) {
|
if (!byte_test_bit(nodenum, query->node_map)) {
|
mlog(0, "disallow join as node %u does not "
|
"have node %u in its nodemap\n",
|
query->node_idx, nodenum);
|
packet.code = JOIN_DISALLOW;
|
goto unlock_respond;
|
}
|
}
|
nodenum++;
|
}
|
|
/* Once the dlm ctxt is marked as leaving then we don't want
|
* to be put in someone's domain map.
|
* Also, explicitly disallow joining at certain troublesome
|
* times (ie. during recovery). */
|
if (dlm->dlm_state != DLM_CTXT_LEAVING) {
|
int bit = query->node_idx;
|
spin_lock(&dlm->spinlock);
|
|
if (dlm->dlm_state == DLM_CTXT_NEW &&
|
dlm->joining_node == DLM_LOCK_RES_OWNER_UNKNOWN) {
|
/*If this is a brand new context and we
|
* haven't started our join process yet, then
|
* the other node won the race. */
|
packet.code = JOIN_OK_NO_MAP;
|
} else if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) {
|
/* Disallow parallel joins. */
|
packet.code = JOIN_DISALLOW;
|
} else if (dlm->reco.state & DLM_RECO_STATE_ACTIVE) {
|
mlog(0, "node %u trying to join, but recovery "
|
"is ongoing.\n", bit);
|
packet.code = JOIN_DISALLOW;
|
} else if (test_bit(bit, dlm->recovery_map)) {
|
mlog(0, "node %u trying to join, but it "
|
"still needs recovery.\n", bit);
|
packet.code = JOIN_DISALLOW;
|
} else if (test_bit(bit, dlm->domain_map)) {
|
mlog(0, "node %u trying to join, but it "
|
"is still in the domain! needs recovery?\n",
|
bit);
|
packet.code = JOIN_DISALLOW;
|
} else {
|
/* Alright we're fully a part of this domain
|
* so we keep some state as to who's joining
|
* and indicate to him that needs to be fixed
|
* up. */
|
|
/* Make sure we speak compatible locking protocols. */
|
if (dlm_query_join_proto_check("DLM", bit,
|
&dlm->dlm_locking_proto,
|
&query->dlm_proto)) {
|
packet.code = JOIN_PROTOCOL_MISMATCH;
|
} else if (dlm_query_join_proto_check("fs", bit,
|
&dlm->fs_locking_proto,
|
&query->fs_proto)) {
|
packet.code = JOIN_PROTOCOL_MISMATCH;
|
} else {
|
packet.dlm_minor = query->dlm_proto.pv_minor;
|
packet.fs_minor = query->fs_proto.pv_minor;
|
packet.code = JOIN_OK;
|
__dlm_set_joining_node(dlm, query->node_idx);
|
}
|
}
|
|
spin_unlock(&dlm->spinlock);
|
}
|
unlock_respond:
|
spin_unlock(&dlm_domain_lock);
|
|
respond:
|
mlog(0, "We respond with %u\n", packet.code);
|
|
dlm_query_join_packet_to_wire(&packet, &response);
|
return response;
|
}
|
|
static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data,
|
void **ret_data)
|
{
|
struct dlm_assert_joined *assert;
|
struct dlm_ctxt *dlm = NULL;
|
|
assert = (struct dlm_assert_joined *) msg->buf;
|
|
mlog(0, "node %u asserts join on domain %s\n", assert->node_idx,
|
assert->domain);
|
|
spin_lock(&dlm_domain_lock);
|
dlm = __dlm_lookup_domain_full(assert->domain, assert->name_len);
|
/* XXX should we consider no dlm ctxt an error? */
|
if (dlm) {
|
spin_lock(&dlm->spinlock);
|
|
/* Alright, this node has officially joined our
|
* domain. Set him in the map and clean up our
|
* leftover join state. */
|
BUG_ON(dlm->joining_node != assert->node_idx);
|
|
if (dlm->reco.state & DLM_RECO_STATE_ACTIVE) {
|
mlog(0, "dlm recovery is ongoing, disallow join\n");
|
spin_unlock(&dlm->spinlock);
|
spin_unlock(&dlm_domain_lock);
|
return -EAGAIN;
|
}
|
|
set_bit(assert->node_idx, dlm->domain_map);
|
clear_bit(assert->node_idx, dlm->exit_domain_map);
|
__dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN);
|
|
printk(KERN_NOTICE "o2dlm: Node %u joins domain %s ",
|
assert->node_idx, dlm->name);
|
__dlm_print_nodes(dlm);
|
|
/* notify anything attached to the heartbeat events */
|
dlm_hb_event_notify_attached(dlm, assert->node_idx, 1);
|
|
spin_unlock(&dlm->spinlock);
|
}
|
spin_unlock(&dlm_domain_lock);
|
|
return 0;
|
}
|
|
static int dlm_match_regions(struct dlm_ctxt *dlm,
|
struct dlm_query_region *qr,
|
char *local, int locallen)
|
{
|
char *remote = qr->qr_regions;
|
char *l, *r;
|
int localnr, i, j, foundit;
|
int status = 0;
|
|
if (!o2hb_global_heartbeat_active()) {
|
if (qr->qr_numregions) {
|
mlog(ML_ERROR, "Domain %s: Joining node %d has global "
|
"heartbeat enabled but local node %d does not\n",
|
qr->qr_domain, qr->qr_node, dlm->node_num);
|
status = -EINVAL;
|
}
|
goto bail;
|
}
|
|
if (o2hb_global_heartbeat_active() && !qr->qr_numregions) {
|
mlog(ML_ERROR, "Domain %s: Local node %d has global "
|
"heartbeat enabled but joining node %d does not\n",
|
qr->qr_domain, dlm->node_num, qr->qr_node);
|
status = -EINVAL;
|
goto bail;
|
}
|
|
r = remote;
|
for (i = 0; i < qr->qr_numregions; ++i) {
|
mlog(0, "Region %.*s\n", O2HB_MAX_REGION_NAME_LEN, r);
|
r += O2HB_MAX_REGION_NAME_LEN;
|
}
|
|
localnr = min(O2NM_MAX_REGIONS, locallen/O2HB_MAX_REGION_NAME_LEN);
|
localnr = o2hb_get_all_regions(local, (u8)localnr);
|
|
/* compare local regions with remote */
|
l = local;
|
for (i = 0; i < localnr; ++i) {
|
foundit = 0;
|
r = remote;
|
for (j = 0; j <= qr->qr_numregions; ++j) {
|
if (!memcmp(l, r, O2HB_MAX_REGION_NAME_LEN)) {
|
foundit = 1;
|
break;
|
}
|
r += O2HB_MAX_REGION_NAME_LEN;
|
}
|
if (!foundit) {
|
status = -EINVAL;
|
mlog(ML_ERROR, "Domain %s: Region '%.*s' registered "
|
"in local node %d but not in joining node %d\n",
|
qr->qr_domain, O2HB_MAX_REGION_NAME_LEN, l,
|
dlm->node_num, qr->qr_node);
|
goto bail;
|
}
|
l += O2HB_MAX_REGION_NAME_LEN;
|
}
|
|
/* compare remote with local regions */
|
r = remote;
|
for (i = 0; i < qr->qr_numregions; ++i) {
|
foundit = 0;
|
l = local;
|
for (j = 0; j < localnr; ++j) {
|
if (!memcmp(r, l, O2HB_MAX_REGION_NAME_LEN)) {
|
foundit = 1;
|
break;
|
}
|
l += O2HB_MAX_REGION_NAME_LEN;
|
}
|
if (!foundit) {
|
status = -EINVAL;
|
mlog(ML_ERROR, "Domain %s: Region '%.*s' registered "
|
"in joining node %d but not in local node %d\n",
|
qr->qr_domain, O2HB_MAX_REGION_NAME_LEN, r,
|
qr->qr_node, dlm->node_num);
|
goto bail;
|
}
|
r += O2HB_MAX_REGION_NAME_LEN;
|
}
|
|
bail:
|
return status;
|
}
|
|
static int dlm_send_regions(struct dlm_ctxt *dlm, unsigned long *node_map)
|
{
|
struct dlm_query_region *qr = NULL;
|
int status, ret = 0, i;
|
char *p;
|
|
if (find_next_bit(node_map, O2NM_MAX_NODES, 0) >= O2NM_MAX_NODES)
|
goto bail;
|
|
qr = kzalloc(sizeof(struct dlm_query_region), GFP_KERNEL);
|
if (!qr) {
|
ret = -ENOMEM;
|
mlog_errno(ret);
|
goto bail;
|
}
|
|
qr->qr_node = dlm->node_num;
|
qr->qr_namelen = strlen(dlm->name);
|
memcpy(qr->qr_domain, dlm->name, qr->qr_namelen);
|
/* if local hb, the numregions will be zero */
|
if (o2hb_global_heartbeat_active())
|
qr->qr_numregions = o2hb_get_all_regions(qr->qr_regions,
|
O2NM_MAX_REGIONS);
|
|
p = qr->qr_regions;
|
for (i = 0; i < qr->qr_numregions; ++i, p += O2HB_MAX_REGION_NAME_LEN)
|
mlog(0, "Region %.*s\n", O2HB_MAX_REGION_NAME_LEN, p);
|
|
i = -1;
|
while ((i = find_next_bit(node_map, O2NM_MAX_NODES,
|
i + 1)) < O2NM_MAX_NODES) {
|
if (i == dlm->node_num)
|
continue;
|
|
mlog(0, "Sending regions to node %d\n", i);
|
|
ret = o2net_send_message(DLM_QUERY_REGION, DLM_MOD_KEY, qr,
|
sizeof(struct dlm_query_region),
|
i, &status);
|
if (ret >= 0)
|
ret = status;
|
if (ret) {
|
mlog(ML_ERROR, "Region mismatch %d, node %d\n",
|
ret, i);
|
break;
|
}
|
}
|
|
bail:
|
kfree(qr);
|
return ret;
|
}
|
|
static int dlm_query_region_handler(struct o2net_msg *msg, u32 len,
|
void *data, void **ret_data)
|
{
|
struct dlm_query_region *qr;
|
struct dlm_ctxt *dlm = NULL;
|
char *local = NULL;
|
int status = 0;
|
|
qr = (struct dlm_query_region *) msg->buf;
|
|
mlog(0, "Node %u queries hb regions on domain %s\n", qr->qr_node,
|
qr->qr_domain);
|
|
/* buffer used in dlm_mast_regions() */
|
local = kmalloc(sizeof(qr->qr_regions), GFP_KERNEL);
|
if (!local)
|
return -ENOMEM;
|
|
status = -EINVAL;
|
|
spin_lock(&dlm_domain_lock);
|
dlm = __dlm_lookup_domain_full(qr->qr_domain, qr->qr_namelen);
|
if (!dlm) {
|
mlog(ML_ERROR, "Node %d queried hb regions on domain %s "
|
"before join domain\n", qr->qr_node, qr->qr_domain);
|
goto out_domain_lock;
|
}
|
|
spin_lock(&dlm->spinlock);
|
if (dlm->joining_node != qr->qr_node) {
|
mlog(ML_ERROR, "Node %d queried hb regions on domain %s "
|
"but joining node is %d\n", qr->qr_node, qr->qr_domain,
|
dlm->joining_node);
|
goto out_dlm_lock;
|
}
|
|
/* Support for global heartbeat was added in 1.1 */
|
if (dlm->dlm_locking_proto.pv_major == 1 &&
|
dlm->dlm_locking_proto.pv_minor == 0) {
|
mlog(ML_ERROR, "Node %d queried hb regions on domain %s "
|
"but active dlm protocol is %d.%d\n", qr->qr_node,
|
qr->qr_domain, dlm->dlm_locking_proto.pv_major,
|
dlm->dlm_locking_proto.pv_minor);
|
goto out_dlm_lock;
|
}
|
|
status = dlm_match_regions(dlm, qr, local, sizeof(qr->qr_regions));
|
|
out_dlm_lock:
|
spin_unlock(&dlm->spinlock);
|
|
out_domain_lock:
|
spin_unlock(&dlm_domain_lock);
|
|
kfree(local);
|
|
return status;
|
}
|
|
static int dlm_match_nodes(struct dlm_ctxt *dlm, struct dlm_query_nodeinfo *qn)
|
{
|
struct o2nm_node *local;
|
struct dlm_node_info *remote;
|
int i, j;
|
int status = 0;
|
|
for (j = 0; j < qn->qn_numnodes; ++j)
|
mlog(0, "Node %3d, %pI4:%u\n", qn->qn_nodes[j].ni_nodenum,
|
&(qn->qn_nodes[j].ni_ipv4_address),
|
ntohs(qn->qn_nodes[j].ni_ipv4_port));
|
|
for (i = 0; i < O2NM_MAX_NODES && !status; ++i) {
|
local = o2nm_get_node_by_num(i);
|
remote = NULL;
|
for (j = 0; j < qn->qn_numnodes; ++j) {
|
if (qn->qn_nodes[j].ni_nodenum == i) {
|
remote = &(qn->qn_nodes[j]);
|
break;
|
}
|
}
|
|
if (!local && !remote)
|
continue;
|
|
if ((local && !remote) || (!local && remote))
|
status = -EINVAL;
|
|
if (!status &&
|
((remote->ni_nodenum != local->nd_num) ||
|
(remote->ni_ipv4_port != local->nd_ipv4_port) ||
|
(remote->ni_ipv4_address != local->nd_ipv4_address)))
|
status = -EINVAL;
|
|
if (status) {
|
if (remote && !local)
|
mlog(ML_ERROR, "Domain %s: Node %d (%pI4:%u) "
|
"registered in joining node %d but not in "
|
"local node %d\n", qn->qn_domain,
|
remote->ni_nodenum,
|
&(remote->ni_ipv4_address),
|
ntohs(remote->ni_ipv4_port),
|
qn->qn_nodenum, dlm->node_num);
|
if (local && !remote)
|
mlog(ML_ERROR, "Domain %s: Node %d (%pI4:%u) "
|
"registered in local node %d but not in "
|
"joining node %d\n", qn->qn_domain,
|
local->nd_num, &(local->nd_ipv4_address),
|
ntohs(local->nd_ipv4_port),
|
dlm->node_num, qn->qn_nodenum);
|
BUG_ON((!local && !remote));
|
}
|
|
if (local)
|
o2nm_node_put(local);
|
}
|
|
return status;
|
}
|
|
static int dlm_send_nodeinfo(struct dlm_ctxt *dlm, unsigned long *node_map)
|
{
|
struct dlm_query_nodeinfo *qn = NULL;
|
struct o2nm_node *node;
|
int ret = 0, status, count, i;
|
|
if (find_next_bit(node_map, O2NM_MAX_NODES, 0) >= O2NM_MAX_NODES)
|
goto bail;
|
|
qn = kzalloc(sizeof(struct dlm_query_nodeinfo), GFP_KERNEL);
|
if (!qn) {
|
ret = -ENOMEM;
|
mlog_errno(ret);
|
goto bail;
|
}
|
|
for (i = 0, count = 0; i < O2NM_MAX_NODES; ++i) {
|
node = o2nm_get_node_by_num(i);
|
if (!node)
|
continue;
|
qn->qn_nodes[count].ni_nodenum = node->nd_num;
|
qn->qn_nodes[count].ni_ipv4_port = node->nd_ipv4_port;
|
qn->qn_nodes[count].ni_ipv4_address = node->nd_ipv4_address;
|
mlog(0, "Node %3d, %pI4:%u\n", node->nd_num,
|
&(node->nd_ipv4_address), ntohs(node->nd_ipv4_port));
|
++count;
|
o2nm_node_put(node);
|
}
|
|
qn->qn_nodenum = dlm->node_num;
|
qn->qn_numnodes = count;
|
qn->qn_namelen = strlen(dlm->name);
|
memcpy(qn->qn_domain, dlm->name, qn->qn_namelen);
|
|
i = -1;
|
while ((i = find_next_bit(node_map, O2NM_MAX_NODES,
|
i + 1)) < O2NM_MAX_NODES) {
|
if (i == dlm->node_num)
|
continue;
|
|
mlog(0, "Sending nodeinfo to node %d\n", i);
|
|
ret = o2net_send_message(DLM_QUERY_NODEINFO, DLM_MOD_KEY,
|
qn, sizeof(struct dlm_query_nodeinfo),
|
i, &status);
|
if (ret >= 0)
|
ret = status;
|
if (ret) {
|
mlog(ML_ERROR, "node mismatch %d, node %d\n", ret, i);
|
break;
|
}
|
}
|
|
bail:
|
kfree(qn);
|
return ret;
|
}
|
|
static int dlm_query_nodeinfo_handler(struct o2net_msg *msg, u32 len,
|
void *data, void **ret_data)
|
{
|
struct dlm_query_nodeinfo *qn;
|
struct dlm_ctxt *dlm = NULL;
|
int locked = 0, status = -EINVAL;
|
|
qn = (struct dlm_query_nodeinfo *) msg->buf;
|
|
mlog(0, "Node %u queries nodes on domain %s\n", qn->qn_nodenum,
|
qn->qn_domain);
|
|
spin_lock(&dlm_domain_lock);
|
dlm = __dlm_lookup_domain_full(qn->qn_domain, qn->qn_namelen);
|
if (!dlm) {
|
mlog(ML_ERROR, "Node %d queried nodes on domain %s before "
|
"join domain\n", qn->qn_nodenum, qn->qn_domain);
|
goto bail;
|
}
|
|
spin_lock(&dlm->spinlock);
|
locked = 1;
|
if (dlm->joining_node != qn->qn_nodenum) {
|
mlog(ML_ERROR, "Node %d queried nodes on domain %s but "
|
"joining node is %d\n", qn->qn_nodenum, qn->qn_domain,
|
dlm->joining_node);
|
goto bail;
|
}
|
|
/* Support for node query was added in 1.1 */
|
if (dlm->dlm_locking_proto.pv_major == 1 &&
|
dlm->dlm_locking_proto.pv_minor == 0) {
|
mlog(ML_ERROR, "Node %d queried nodes on domain %s "
|
"but active dlm protocol is %d.%d\n", qn->qn_nodenum,
|
qn->qn_domain, dlm->dlm_locking_proto.pv_major,
|
dlm->dlm_locking_proto.pv_minor);
|
goto bail;
|
}
|
|
status = dlm_match_nodes(dlm, qn);
|
|
bail:
|
if (locked)
|
spin_unlock(&dlm->spinlock);
|
spin_unlock(&dlm_domain_lock);
|
|
return status;
|
}
|
|
static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data,
|
void **ret_data)
|
{
|
struct dlm_cancel_join *cancel;
|
struct dlm_ctxt *dlm = NULL;
|
|
cancel = (struct dlm_cancel_join *) msg->buf;
|
|
mlog(0, "node %u cancels join on domain %s\n", cancel->node_idx,
|
cancel->domain);
|
|
spin_lock(&dlm_domain_lock);
|
dlm = __dlm_lookup_domain_full(cancel->domain, cancel->name_len);
|
|
if (dlm) {
|
spin_lock(&dlm->spinlock);
|
|
/* Yikes, this guy wants to cancel his join. No
|
* problem, we simply cleanup our join state. */
|
BUG_ON(dlm->joining_node != cancel->node_idx);
|
__dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN);
|
|
spin_unlock(&dlm->spinlock);
|
}
|
spin_unlock(&dlm_domain_lock);
|
|
return 0;
|
}
|
|
static int dlm_send_one_join_cancel(struct dlm_ctxt *dlm,
|
unsigned int node)
|
{
|
int status;
|
struct dlm_cancel_join cancel_msg;
|
|
memset(&cancel_msg, 0, sizeof(cancel_msg));
|
cancel_msg.node_idx = dlm->node_num;
|
cancel_msg.name_len = strlen(dlm->name);
|
memcpy(cancel_msg.domain, dlm->name, cancel_msg.name_len);
|
|
status = o2net_send_message(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY,
|
&cancel_msg, sizeof(cancel_msg), node,
|
NULL);
|
if (status < 0) {
|
mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to "
|
"node %u\n", status, DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY,
|
node);
|
goto bail;
|
}
|
|
bail:
|
return status;
|
}
|
|
/* map_size should be in bytes. */
|
static int dlm_send_join_cancels(struct dlm_ctxt *dlm,
|
unsigned long *node_map,
|
unsigned int map_size)
|
{
|
int status, tmpstat;
|
int node;
|
|
if (map_size != (BITS_TO_LONGS(O2NM_MAX_NODES) *
|
sizeof(unsigned long))) {
|
mlog(ML_ERROR,
|
"map_size %u != BITS_TO_LONGS(O2NM_MAX_NODES) %u\n",
|
map_size, (unsigned)BITS_TO_LONGS(O2NM_MAX_NODES));
|
return -EINVAL;
|
}
|
|
status = 0;
|
node = -1;
|
while ((node = find_next_bit(node_map, O2NM_MAX_NODES,
|
node + 1)) < O2NM_MAX_NODES) {
|
if (node == dlm->node_num)
|
continue;
|
|
tmpstat = dlm_send_one_join_cancel(dlm, node);
|
if (tmpstat) {
|
mlog(ML_ERROR, "Error return %d cancelling join on "
|
"node %d\n", tmpstat, node);
|
if (!status)
|
status = tmpstat;
|
}
|
}
|
|
if (status)
|
mlog_errno(status);
|
return status;
|
}
|
|
static int dlm_request_join(struct dlm_ctxt *dlm,
|
int node,
|
enum dlm_query_join_response_code *response)
|
{
|
int status;
|
struct dlm_query_join_request join_msg;
|
struct dlm_query_join_packet packet;
|
u32 join_resp;
|
|
mlog(0, "querying node %d\n", node);
|
|
memset(&join_msg, 0, sizeof(join_msg));
|
join_msg.node_idx = dlm->node_num;
|
join_msg.name_len = strlen(dlm->name);
|
memcpy(join_msg.domain, dlm->name, join_msg.name_len);
|
join_msg.dlm_proto = dlm->dlm_locking_proto;
|
join_msg.fs_proto = dlm->fs_locking_proto;
|
|
/* copy live node map to join message */
|
byte_copymap(join_msg.node_map, dlm->live_nodes_map, O2NM_MAX_NODES);
|
|
status = o2net_send_message(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, &join_msg,
|
sizeof(join_msg), node, &join_resp);
|
if (status < 0 && status != -ENOPROTOOPT) {
|
mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to "
|
"node %u\n", status, DLM_QUERY_JOIN_MSG, DLM_MOD_KEY,
|
node);
|
goto bail;
|
}
|
dlm_query_join_wire_to_packet(join_resp, &packet);
|
|
/* -ENOPROTOOPT from the net code means the other side isn't
|
listening for our message type -- that's fine, it means
|
his dlm isn't up, so we can consider him a 'yes' but not
|
joined into the domain. */
|
if (status == -ENOPROTOOPT) {
|
status = 0;
|
*response = JOIN_OK_NO_MAP;
|
} else {
|
*response = packet.code;
|
switch (packet.code) {
|
case JOIN_DISALLOW:
|
case JOIN_OK_NO_MAP:
|
break;
|
case JOIN_PROTOCOL_MISMATCH:
|
mlog(ML_NOTICE,
|
"This node requested DLM locking protocol %u.%u and "
|
"filesystem locking protocol %u.%u. At least one of "
|
"the protocol versions on node %d is not compatible, "
|
"disconnecting\n",
|
dlm->dlm_locking_proto.pv_major,
|
dlm->dlm_locking_proto.pv_minor,
|
dlm->fs_locking_proto.pv_major,
|
dlm->fs_locking_proto.pv_minor,
|
node);
|
status = -EPROTO;
|
break;
|
case JOIN_OK:
|
/* Use the same locking protocol as the remote node */
|
dlm->dlm_locking_proto.pv_minor = packet.dlm_minor;
|
dlm->fs_locking_proto.pv_minor = packet.fs_minor;
|
mlog(0,
|
"Node %d responds JOIN_OK with DLM locking protocol "
|
"%u.%u and fs locking protocol %u.%u\n",
|
node,
|
dlm->dlm_locking_proto.pv_major,
|
dlm->dlm_locking_proto.pv_minor,
|
dlm->fs_locking_proto.pv_major,
|
dlm->fs_locking_proto.pv_minor);
|
break;
|
default:
|
status = -EINVAL;
|
mlog(ML_ERROR, "invalid response %d from node %u\n",
|
packet.code, node);
|
/* Reset response to JOIN_DISALLOW */
|
*response = JOIN_DISALLOW;
|
break;
|
}
|
}
|
|
mlog(0, "status %d, node %d response is %d\n", status, node,
|
*response);
|
|
bail:
|
return status;
|
}
|
|
static int dlm_send_one_join_assert(struct dlm_ctxt *dlm,
|
unsigned int node)
|
{
|
int status;
|
int ret;
|
struct dlm_assert_joined assert_msg;
|
|
mlog(0, "Sending join assert to node %u\n", node);
|
|
memset(&assert_msg, 0, sizeof(assert_msg));
|
assert_msg.node_idx = dlm->node_num;
|
assert_msg.name_len = strlen(dlm->name);
|
memcpy(assert_msg.domain, dlm->name, assert_msg.name_len);
|
|
status = o2net_send_message(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY,
|
&assert_msg, sizeof(assert_msg), node,
|
&ret);
|
if (status < 0)
|
mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to "
|
"node %u\n", status, DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY,
|
node);
|
else
|
status = ret;
|
|
return status;
|
}
|
|
static void dlm_send_join_asserts(struct dlm_ctxt *dlm,
|
unsigned long *node_map)
|
{
|
int status, node, live;
|
|
status = 0;
|
node = -1;
|
while ((node = find_next_bit(node_map, O2NM_MAX_NODES,
|
node + 1)) < O2NM_MAX_NODES) {
|
if (node == dlm->node_num)
|
continue;
|
|
do {
|
/* It is very important that this message be
|
* received so we spin until either the node
|
* has died or it gets the message. */
|
status = dlm_send_one_join_assert(dlm, node);
|
|
spin_lock(&dlm->spinlock);
|
live = test_bit(node, dlm->live_nodes_map);
|
spin_unlock(&dlm->spinlock);
|
|
if (status) {
|
mlog(ML_ERROR, "Error return %d asserting "
|
"join on node %d\n", status, node);
|
|
/* give us some time between errors... */
|
if (live)
|
msleep(DLM_DOMAIN_BACKOFF_MS);
|
}
|
} while (status && live);
|
}
|
}
|
|
struct domain_join_ctxt {
|
unsigned long live_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
|
unsigned long yes_resp_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
|
};
|
|
static int dlm_should_restart_join(struct dlm_ctxt *dlm,
|
struct domain_join_ctxt *ctxt,
|
enum dlm_query_join_response_code response)
|
{
|
int ret;
|
|
if (response == JOIN_DISALLOW) {
|
mlog(0, "Latest response of disallow -- should restart\n");
|
return 1;
|
}
|
|
spin_lock(&dlm->spinlock);
|
/* For now, we restart the process if the node maps have
|
* changed at all */
|
ret = memcmp(ctxt->live_map, dlm->live_nodes_map,
|
sizeof(dlm->live_nodes_map));
|
spin_unlock(&dlm->spinlock);
|
|
if (ret)
|
mlog(0, "Node maps changed -- should restart\n");
|
|
return ret;
|
}
|
|
static int dlm_try_to_join_domain(struct dlm_ctxt *dlm)
|
{
|
int status = 0, tmpstat, node;
|
struct domain_join_ctxt *ctxt;
|
enum dlm_query_join_response_code response = JOIN_DISALLOW;
|
|
mlog(0, "%p", dlm);
|
|
ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
|
if (!ctxt) {
|
status = -ENOMEM;
|
mlog_errno(status);
|
goto bail;
|
}
|
|
/* group sem locking should work for us here -- we're already
|
* registered for heartbeat events so filling this should be
|
* atomic wrt getting those handlers called. */
|
o2hb_fill_node_map(dlm->live_nodes_map, sizeof(dlm->live_nodes_map));
|
|
spin_lock(&dlm->spinlock);
|
memcpy(ctxt->live_map, dlm->live_nodes_map, sizeof(ctxt->live_map));
|
|
__dlm_set_joining_node(dlm, dlm->node_num);
|
|
spin_unlock(&dlm->spinlock);
|
|
node = -1;
|
while ((node = find_next_bit(ctxt->live_map, O2NM_MAX_NODES,
|
node + 1)) < O2NM_MAX_NODES) {
|
if (node == dlm->node_num)
|
continue;
|
|
status = dlm_request_join(dlm, node, &response);
|
if (status < 0) {
|
mlog_errno(status);
|
goto bail;
|
}
|
|
/* Ok, either we got a response or the node doesn't have a
|
* dlm up. */
|
if (response == JOIN_OK)
|
set_bit(node, ctxt->yes_resp_map);
|
|
if (dlm_should_restart_join(dlm, ctxt, response)) {
|
status = -EAGAIN;
|
goto bail;
|
}
|
}
|
|
mlog(0, "Yay, done querying nodes!\n");
|
|
/* Yay, everyone agree's we can join the domain. My domain is
|
* comprised of all nodes who were put in the
|
* yes_resp_map. Copy that into our domain map and send a join
|
* assert message to clean up everyone elses state. */
|
spin_lock(&dlm->spinlock);
|
memcpy(dlm->domain_map, ctxt->yes_resp_map,
|
sizeof(ctxt->yes_resp_map));
|
set_bit(dlm->node_num, dlm->domain_map);
|
spin_unlock(&dlm->spinlock);
|
|
/* Support for global heartbeat and node info was added in 1.1 */
|
if (dlm->dlm_locking_proto.pv_major > 1 ||
|
dlm->dlm_locking_proto.pv_minor > 0) {
|
status = dlm_send_nodeinfo(dlm, ctxt->yes_resp_map);
|
if (status) {
|
mlog_errno(status);
|
goto bail;
|
}
|
status = dlm_send_regions(dlm, ctxt->yes_resp_map);
|
if (status) {
|
mlog_errno(status);
|
goto bail;
|
}
|
}
|
|
dlm_send_join_asserts(dlm, ctxt->yes_resp_map);
|
|
/* Joined state *must* be set before the joining node
|
* information, otherwise the query_join handler may read no
|
* current joiner but a state of NEW and tell joining nodes
|
* we're not in the domain. */
|
spin_lock(&dlm_domain_lock);
|
dlm->dlm_state = DLM_CTXT_JOINED;
|
dlm->num_joins++;
|
spin_unlock(&dlm_domain_lock);
|
|
bail:
|
spin_lock(&dlm->spinlock);
|
__dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN);
|
if (!status) {
|
printk(KERN_NOTICE "o2dlm: Joining domain %s ", dlm->name);
|
__dlm_print_nodes(dlm);
|
}
|
spin_unlock(&dlm->spinlock);
|
|
if (ctxt) {
|
/* Do we need to send a cancel message to any nodes? */
|
if (status < 0) {
|
tmpstat = dlm_send_join_cancels(dlm,
|
ctxt->yes_resp_map,
|
sizeof(ctxt->yes_resp_map));
|
if (tmpstat < 0)
|
mlog_errno(tmpstat);
|
}
|
kfree(ctxt);
|
}
|
|
mlog(0, "returning %d\n", status);
|
return status;
|
}
|
|
static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm)
|
{
|
o2hb_unregister_callback(dlm->name, &dlm->dlm_hb_up);
|
o2hb_unregister_callback(dlm->name, &dlm->dlm_hb_down);
|
o2net_unregister_handler_list(&dlm->dlm_domain_handlers);
|
}
|
|
static int dlm_register_domain_handlers(struct dlm_ctxt *dlm)
|
{
|
int status;
|
|
mlog(0, "registering handlers.\n");
|
|
o2hb_setup_callback(&dlm->dlm_hb_down, O2HB_NODE_DOWN_CB,
|
dlm_hb_node_down_cb, dlm, DLM_HB_NODE_DOWN_PRI);
|
o2hb_setup_callback(&dlm->dlm_hb_up, O2HB_NODE_UP_CB,
|
dlm_hb_node_up_cb, dlm, DLM_HB_NODE_UP_PRI);
|
|
status = o2hb_register_callback(dlm->name, &dlm->dlm_hb_down);
|
if (status)
|
goto bail;
|
|
status = o2hb_register_callback(dlm->name, &dlm->dlm_hb_up);
|
if (status)
|
goto bail;
|
|
status = o2net_register_handler(DLM_MASTER_REQUEST_MSG, dlm->key,
|
sizeof(struct dlm_master_request),
|
dlm_master_request_handler,
|
dlm, NULL, &dlm->dlm_domain_handlers);
|
if (status)
|
goto bail;
|
|
status = o2net_register_handler(DLM_ASSERT_MASTER_MSG, dlm->key,
|
sizeof(struct dlm_assert_master),
|
dlm_assert_master_handler,
|
dlm, dlm_assert_master_post_handler,
|
&dlm->dlm_domain_handlers);
|
if (status)
|
goto bail;
|
|
status = o2net_register_handler(DLM_CREATE_LOCK_MSG, dlm->key,
|
sizeof(struct dlm_create_lock),
|
dlm_create_lock_handler,
|
dlm, NULL, &dlm->dlm_domain_handlers);
|
if (status)
|
goto bail;
|
|
status = o2net_register_handler(DLM_CONVERT_LOCK_MSG, dlm->key,
|
DLM_CONVERT_LOCK_MAX_LEN,
|
dlm_convert_lock_handler,
|
dlm, NULL, &dlm->dlm_domain_handlers);
|
if (status)
|
goto bail;
|
|
status = o2net_register_handler(DLM_UNLOCK_LOCK_MSG, dlm->key,
|
DLM_UNLOCK_LOCK_MAX_LEN,
|
dlm_unlock_lock_handler,
|
dlm, NULL, &dlm->dlm_domain_handlers);
|
if (status)
|
goto bail;
|
|
status = o2net_register_handler(DLM_PROXY_AST_MSG, dlm->key,
|
DLM_PROXY_AST_MAX_LEN,
|
dlm_proxy_ast_handler,
|
dlm, NULL, &dlm->dlm_domain_handlers);
|
if (status)
|
goto bail;
|
|
status = o2net_register_handler(DLM_EXIT_DOMAIN_MSG, dlm->key,
|
sizeof(struct dlm_exit_domain),
|
dlm_exit_domain_handler,
|
dlm, NULL, &dlm->dlm_domain_handlers);
|
if (status)
|
goto bail;
|
|
status = o2net_register_handler(DLM_DEREF_LOCKRES_MSG, dlm->key,
|
sizeof(struct dlm_deref_lockres),
|
dlm_deref_lockres_handler,
|
dlm, NULL, &dlm->dlm_domain_handlers);
|
if (status)
|
goto bail;
|
|
status = o2net_register_handler(DLM_MIGRATE_REQUEST_MSG, dlm->key,
|
sizeof(struct dlm_migrate_request),
|
dlm_migrate_request_handler,
|
dlm, NULL, &dlm->dlm_domain_handlers);
|
if (status)
|
goto bail;
|
|
status = o2net_register_handler(DLM_MIG_LOCKRES_MSG, dlm->key,
|
DLM_MIG_LOCKRES_MAX_LEN,
|
dlm_mig_lockres_handler,
|
dlm, NULL, &dlm->dlm_domain_handlers);
|
if (status)
|
goto bail;
|
|
status = o2net_register_handler(DLM_MASTER_REQUERY_MSG, dlm->key,
|
sizeof(struct dlm_master_requery),
|
dlm_master_requery_handler,
|
dlm, NULL, &dlm->dlm_domain_handlers);
|
if (status)
|
goto bail;
|
|
status = o2net_register_handler(DLM_LOCK_REQUEST_MSG, dlm->key,
|
sizeof(struct dlm_lock_request),
|
dlm_request_all_locks_handler,
|
dlm, NULL, &dlm->dlm_domain_handlers);
|
if (status)
|
goto bail;
|
|
status = o2net_register_handler(DLM_RECO_DATA_DONE_MSG, dlm->key,
|
sizeof(struct dlm_reco_data_done),
|
dlm_reco_data_done_handler,
|
dlm, NULL, &dlm->dlm_domain_handlers);
|
if (status)
|
goto bail;
|
|
status = o2net_register_handler(DLM_BEGIN_RECO_MSG, dlm->key,
|
sizeof(struct dlm_begin_reco),
|
dlm_begin_reco_handler,
|
dlm, NULL, &dlm->dlm_domain_handlers);
|
if (status)
|
goto bail;
|
|
status = o2net_register_handler(DLM_FINALIZE_RECO_MSG, dlm->key,
|
sizeof(struct dlm_finalize_reco),
|
dlm_finalize_reco_handler,
|
dlm, NULL, &dlm->dlm_domain_handlers);
|
if (status)
|
goto bail;
|
|
status = o2net_register_handler(DLM_BEGIN_EXIT_DOMAIN_MSG, dlm->key,
|
sizeof(struct dlm_exit_domain),
|
dlm_begin_exit_domain_handler,
|
dlm, NULL, &dlm->dlm_domain_handlers);
|
if (status)
|
goto bail;
|
|
status = o2net_register_handler(DLM_DEREF_LOCKRES_DONE, dlm->key,
|
sizeof(struct dlm_deref_lockres_done),
|
dlm_deref_lockres_done_handler,
|
dlm, NULL, &dlm->dlm_domain_handlers);
|
bail:
|
if (status)
|
dlm_unregister_domain_handlers(dlm);
|
|
return status;
|
}
|
|
static int dlm_join_domain(struct dlm_ctxt *dlm)
|
{
|
int status;
|
unsigned int backoff;
|
unsigned int total_backoff = 0;
|
char wq_name[O2NM_MAX_NAME_LEN];
|
|
BUG_ON(!dlm);
|
|
mlog(0, "Join domain %s\n", dlm->name);
|
|
status = dlm_register_domain_handlers(dlm);
|
if (status) {
|
mlog_errno(status);
|
goto bail;
|
}
|
|
status = dlm_launch_thread(dlm);
|
if (status < 0) {
|
mlog_errno(status);
|
goto bail;
|
}
|
|
status = dlm_launch_recovery_thread(dlm);
|
if (status < 0) {
|
mlog_errno(status);
|
goto bail;
|
}
|
|
dlm_debug_init(dlm);
|
|
snprintf(wq_name, O2NM_MAX_NAME_LEN, "dlm_wq-%s", dlm->name);
|
dlm->dlm_worker = alloc_workqueue(wq_name, WQ_MEM_RECLAIM, 0);
|
if (!dlm->dlm_worker) {
|
status = -ENOMEM;
|
mlog_errno(status);
|
goto bail;
|
}
|
|
do {
|
status = dlm_try_to_join_domain(dlm);
|
|
/* If we're racing another node to the join, then we
|
* need to back off temporarily and let them
|
* complete. */
|
#define DLM_JOIN_TIMEOUT_MSECS 90000
|
if (status == -EAGAIN) {
|
if (signal_pending(current)) {
|
status = -ERESTARTSYS;
|
goto bail;
|
}
|
|
if (total_backoff > DLM_JOIN_TIMEOUT_MSECS) {
|
status = -ERESTARTSYS;
|
mlog(ML_NOTICE, "Timed out joining dlm domain "
|
"%s after %u msecs\n", dlm->name,
|
total_backoff);
|
goto bail;
|
}
|
|
/*
|
* <chip> After you!
|
* <dale> No, after you!
|
* <chip> I insist!
|
* <dale> But you first!
|
* ...
|
*/
|
backoff = (unsigned int)(jiffies & 0x3);
|
backoff *= DLM_DOMAIN_BACKOFF_MS;
|
total_backoff += backoff;
|
mlog(0, "backoff %d\n", backoff);
|
msleep(backoff);
|
}
|
} while (status == -EAGAIN);
|
|
if (status < 0) {
|
mlog_errno(status);
|
goto bail;
|
}
|
|
status = 0;
|
bail:
|
wake_up(&dlm_domain_events);
|
|
if (status) {
|
dlm_unregister_domain_handlers(dlm);
|
dlm_complete_thread(dlm);
|
dlm_complete_recovery_thread(dlm);
|
dlm_destroy_dlm_worker(dlm);
|
}
|
|
return status;
|
}
|
|
static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain,
|
u32 key)
|
{
|
int i;
|
int ret;
|
struct dlm_ctxt *dlm = NULL;
|
|
dlm = kzalloc(sizeof(*dlm), GFP_KERNEL);
|
if (!dlm) {
|
ret = -ENOMEM;
|
mlog_errno(ret);
|
goto leave;
|
}
|
|
dlm->name = kstrdup(domain, GFP_KERNEL);
|
if (dlm->name == NULL) {
|
ret = -ENOMEM;
|
mlog_errno(ret);
|
goto leave;
|
}
|
|
dlm->lockres_hash = (struct hlist_head **)dlm_alloc_pagevec(DLM_HASH_PAGES);
|
if (!dlm->lockres_hash) {
|
ret = -ENOMEM;
|
mlog_errno(ret);
|
goto leave;
|
}
|
|
for (i = 0; i < DLM_HASH_BUCKETS; i++)
|
INIT_HLIST_HEAD(dlm_lockres_hash(dlm, i));
|
|
dlm->master_hash = (struct hlist_head **)
|
dlm_alloc_pagevec(DLM_HASH_PAGES);
|
if (!dlm->master_hash) {
|
ret = -ENOMEM;
|
mlog_errno(ret);
|
goto leave;
|
}
|
|
for (i = 0; i < DLM_HASH_BUCKETS; i++)
|
INIT_HLIST_HEAD(dlm_master_hash(dlm, i));
|
|
dlm->key = key;
|
dlm->node_num = o2nm_this_node();
|
|
dlm_create_debugfs_subroot(dlm);
|
|
spin_lock_init(&dlm->spinlock);
|
spin_lock_init(&dlm->master_lock);
|
spin_lock_init(&dlm->ast_lock);
|
spin_lock_init(&dlm->track_lock);
|
INIT_LIST_HEAD(&dlm->list);
|
INIT_LIST_HEAD(&dlm->dirty_list);
|
INIT_LIST_HEAD(&dlm->reco.resources);
|
INIT_LIST_HEAD(&dlm->reco.node_data);
|
INIT_LIST_HEAD(&dlm->purge_list);
|
INIT_LIST_HEAD(&dlm->dlm_domain_handlers);
|
INIT_LIST_HEAD(&dlm->tracking_list);
|
dlm->reco.state = 0;
|
|
INIT_LIST_HEAD(&dlm->pending_asts);
|
INIT_LIST_HEAD(&dlm->pending_basts);
|
|
mlog(0, "dlm->recovery_map=%p, &(dlm->recovery_map[0])=%p\n",
|
dlm->recovery_map, &(dlm->recovery_map[0]));
|
|
memset(dlm->recovery_map, 0, sizeof(dlm->recovery_map));
|
memset(dlm->live_nodes_map, 0, sizeof(dlm->live_nodes_map));
|
memset(dlm->domain_map, 0, sizeof(dlm->domain_map));
|
|
dlm->dlm_thread_task = NULL;
|
dlm->dlm_reco_thread_task = NULL;
|
dlm->dlm_worker = NULL;
|
init_waitqueue_head(&dlm->dlm_thread_wq);
|
init_waitqueue_head(&dlm->dlm_reco_thread_wq);
|
init_waitqueue_head(&dlm->reco.event);
|
init_waitqueue_head(&dlm->ast_wq);
|
init_waitqueue_head(&dlm->migration_wq);
|
INIT_LIST_HEAD(&dlm->mle_hb_events);
|
|
dlm->joining_node = DLM_LOCK_RES_OWNER_UNKNOWN;
|
init_waitqueue_head(&dlm->dlm_join_events);
|
|
dlm->migrate_done = 0;
|
|
dlm->reco.new_master = O2NM_INVALID_NODE_NUM;
|
dlm->reco.dead_node = O2NM_INVALID_NODE_NUM;
|
|
atomic_set(&dlm->res_tot_count, 0);
|
atomic_set(&dlm->res_cur_count, 0);
|
for (i = 0; i < DLM_MLE_NUM_TYPES; ++i) {
|
atomic_set(&dlm->mle_tot_count[i], 0);
|
atomic_set(&dlm->mle_cur_count[i], 0);
|
}
|
|
spin_lock_init(&dlm->work_lock);
|
INIT_LIST_HEAD(&dlm->work_list);
|
INIT_WORK(&dlm->dispatched_work, dlm_dispatch_work);
|
|
kref_init(&dlm->dlm_refs);
|
dlm->dlm_state = DLM_CTXT_NEW;
|
|
INIT_LIST_HEAD(&dlm->dlm_eviction_callbacks);
|
|
mlog(0, "context init: refcount %u\n",
|
kref_read(&dlm->dlm_refs));
|
|
ret = 0;
|
leave:
|
if (ret < 0 && dlm) {
|
if (dlm->master_hash)
|
dlm_free_pagevec((void **)dlm->master_hash,
|
DLM_HASH_PAGES);
|
|
if (dlm->lockres_hash)
|
dlm_free_pagevec((void **)dlm->lockres_hash,
|
DLM_HASH_PAGES);
|
|
kfree(dlm->name);
|
kfree(dlm);
|
dlm = NULL;
|
}
|
return dlm;
|
}
|
|
/*
|
* Compare a requested locking protocol version against the current one.
|
*
|
* If the major numbers are different, they are incompatible.
|
* If the current minor is greater than the request, they are incompatible.
|
* If the current minor is less than or equal to the request, they are
|
* compatible, and the requester should run at the current minor version.
|
*/
|
static int dlm_protocol_compare(struct dlm_protocol_version *existing,
|
struct dlm_protocol_version *request)
|
{
|
if (existing->pv_major != request->pv_major)
|
return 1;
|
|
if (existing->pv_minor > request->pv_minor)
|
return 1;
|
|
if (existing->pv_minor < request->pv_minor)
|
request->pv_minor = existing->pv_minor;
|
|
return 0;
|
}
|
|
/*
|
* dlm_register_domain: one-time setup per "domain".
|
*
|
* The filesystem passes in the requested locking version via proto.
|
* If registration was successful, proto will contain the negotiated
|
* locking protocol.
|
*/
|
struct dlm_ctxt * dlm_register_domain(const char *domain,
|
u32 key,
|
struct dlm_protocol_version *fs_proto)
|
{
|
int ret;
|
struct dlm_ctxt *dlm = NULL;
|
struct dlm_ctxt *new_ctxt = NULL;
|
|
if (strlen(domain) >= O2NM_MAX_NAME_LEN) {
|
ret = -ENAMETOOLONG;
|
mlog(ML_ERROR, "domain name length too long\n");
|
goto leave;
|
}
|
|
mlog(0, "register called for domain \"%s\"\n", domain);
|
|
retry:
|
dlm = NULL;
|
if (signal_pending(current)) {
|
ret = -ERESTARTSYS;
|
mlog_errno(ret);
|
goto leave;
|
}
|
|
spin_lock(&dlm_domain_lock);
|
|
dlm = __dlm_lookup_domain(domain);
|
if (dlm) {
|
if (dlm->dlm_state != DLM_CTXT_JOINED) {
|
spin_unlock(&dlm_domain_lock);
|
|
mlog(0, "This ctxt is not joined yet!\n");
|
wait_event_interruptible(dlm_domain_events,
|
dlm_wait_on_domain_helper(
|
domain));
|
goto retry;
|
}
|
|
if (dlm_protocol_compare(&dlm->fs_locking_proto, fs_proto)) {
|
spin_unlock(&dlm_domain_lock);
|
mlog(ML_ERROR,
|
"Requested locking protocol version is not "
|
"compatible with already registered domain "
|
"\"%s\"\n", domain);
|
ret = -EPROTO;
|
goto leave;
|
}
|
|
__dlm_get(dlm);
|
dlm->num_joins++;
|
|
spin_unlock(&dlm_domain_lock);
|
|
ret = 0;
|
goto leave;
|
}
|
|
/* doesn't exist */
|
if (!new_ctxt) {
|
spin_unlock(&dlm_domain_lock);
|
|
new_ctxt = dlm_alloc_ctxt(domain, key);
|
if (new_ctxt)
|
goto retry;
|
|
ret = -ENOMEM;
|
mlog_errno(ret);
|
goto leave;
|
}
|
|
/* a little variable switch-a-roo here... */
|
dlm = new_ctxt;
|
new_ctxt = NULL;
|
|
/* add the new domain */
|
list_add_tail(&dlm->list, &dlm_domains);
|
spin_unlock(&dlm_domain_lock);
|
|
/*
|
* Pass the locking protocol version into the join. If the join
|
* succeeds, it will have the negotiated protocol set.
|
*/
|
dlm->dlm_locking_proto = dlm_protocol;
|
dlm->fs_locking_proto = *fs_proto;
|
|
ret = dlm_join_domain(dlm);
|
if (ret) {
|
mlog_errno(ret);
|
dlm_put(dlm);
|
goto leave;
|
}
|
|
/* Tell the caller what locking protocol we negotiated */
|
*fs_proto = dlm->fs_locking_proto;
|
|
ret = 0;
|
leave:
|
if (new_ctxt)
|
dlm_free_ctxt_mem(new_ctxt);
|
|
if (ret < 0)
|
dlm = ERR_PTR(ret);
|
|
return dlm;
|
}
|
EXPORT_SYMBOL_GPL(dlm_register_domain);
|
|
static LIST_HEAD(dlm_join_handlers);
|
|
static void dlm_unregister_net_handlers(void)
|
{
|
o2net_unregister_handler_list(&dlm_join_handlers);
|
}
|
|
static int dlm_register_net_handlers(void)
|
{
|
int status = 0;
|
|
status = o2net_register_handler(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY,
|
sizeof(struct dlm_query_join_request),
|
dlm_query_join_handler,
|
NULL, NULL, &dlm_join_handlers);
|
if (status)
|
goto bail;
|
|
status = o2net_register_handler(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY,
|
sizeof(struct dlm_assert_joined),
|
dlm_assert_joined_handler,
|
NULL, NULL, &dlm_join_handlers);
|
if (status)
|
goto bail;
|
|
status = o2net_register_handler(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY,
|
sizeof(struct dlm_cancel_join),
|
dlm_cancel_join_handler,
|
NULL, NULL, &dlm_join_handlers);
|
if (status)
|
goto bail;
|
|
status = o2net_register_handler(DLM_QUERY_REGION, DLM_MOD_KEY,
|
sizeof(struct dlm_query_region),
|
dlm_query_region_handler,
|
NULL, NULL, &dlm_join_handlers);
|
|
if (status)
|
goto bail;
|
|
status = o2net_register_handler(DLM_QUERY_NODEINFO, DLM_MOD_KEY,
|
sizeof(struct dlm_query_nodeinfo),
|
dlm_query_nodeinfo_handler,
|
NULL, NULL, &dlm_join_handlers);
|
bail:
|
if (status < 0)
|
dlm_unregister_net_handlers();
|
|
return status;
|
}
|
|
/* Domain eviction callback handling.
|
*
|
* The file system requires notification of node death *before* the
|
* dlm completes it's recovery work, otherwise it may be able to
|
* acquire locks on resources requiring recovery. Since the dlm can
|
* evict a node from it's domain *before* heartbeat fires, a similar
|
* mechanism is required. */
|
|
/* Eviction is not expected to happen often, so a per-domain lock is
|
* not necessary. Eviction callbacks are allowed to sleep for short
|
* periods of time. */
|
static DECLARE_RWSEM(dlm_callback_sem);
|
|
void dlm_fire_domain_eviction_callbacks(struct dlm_ctxt *dlm,
|
int node_num)
|
{
|
struct dlm_eviction_cb *cb;
|
|
down_read(&dlm_callback_sem);
|
list_for_each_entry(cb, &dlm->dlm_eviction_callbacks, ec_item) {
|
cb->ec_func(node_num, cb->ec_data);
|
}
|
up_read(&dlm_callback_sem);
|
}
|
|
void dlm_setup_eviction_cb(struct dlm_eviction_cb *cb,
|
dlm_eviction_func *f,
|
void *data)
|
{
|
INIT_LIST_HEAD(&cb->ec_item);
|
cb->ec_func = f;
|
cb->ec_data = data;
|
}
|
EXPORT_SYMBOL_GPL(dlm_setup_eviction_cb);
|
|
void dlm_register_eviction_cb(struct dlm_ctxt *dlm,
|
struct dlm_eviction_cb *cb)
|
{
|
down_write(&dlm_callback_sem);
|
list_add_tail(&cb->ec_item, &dlm->dlm_eviction_callbacks);
|
up_write(&dlm_callback_sem);
|
}
|
EXPORT_SYMBOL_GPL(dlm_register_eviction_cb);
|
|
void dlm_unregister_eviction_cb(struct dlm_eviction_cb *cb)
|
{
|
down_write(&dlm_callback_sem);
|
list_del_init(&cb->ec_item);
|
up_write(&dlm_callback_sem);
|
}
|
EXPORT_SYMBOL_GPL(dlm_unregister_eviction_cb);
|
|
static int __init dlm_init(void)
|
{
|
int status;
|
|
status = dlm_init_mle_cache();
|
if (status) {
|
mlog(ML_ERROR, "Could not create o2dlm_mle slabcache\n");
|
goto error;
|
}
|
|
status = dlm_init_master_caches();
|
if (status) {
|
mlog(ML_ERROR, "Could not create o2dlm_lockres and "
|
"o2dlm_lockname slabcaches\n");
|
goto error;
|
}
|
|
status = dlm_init_lock_cache();
|
if (status) {
|
mlog(ML_ERROR, "Count not create o2dlm_lock slabcache\n");
|
goto error;
|
}
|
|
status = dlm_register_net_handlers();
|
if (status) {
|
mlog(ML_ERROR, "Unable to register network handlers\n");
|
goto error;
|
}
|
|
dlm_create_debugfs_root();
|
|
return 0;
|
error:
|
dlm_unregister_net_handlers();
|
dlm_destroy_lock_cache();
|
dlm_destroy_master_caches();
|
dlm_destroy_mle_cache();
|
return -1;
|
}
|
|
static void __exit dlm_exit (void)
|
{
|
dlm_destroy_debugfs_root();
|
dlm_unregister_net_handlers();
|
dlm_destroy_lock_cache();
|
dlm_destroy_master_caches();
|
dlm_destroy_mle_cache();
|
}
|
|
MODULE_AUTHOR("Oracle");
|
MODULE_LICENSE("GPL");
|
MODULE_DESCRIPTION("OCFS2 Distributed Lock Management");
|
|
module_init(dlm_init);
|
module_exit(dlm_exit);
|
