wait_queue_head_t wq;
atomic_t woken;
struct kref mle_refs;
+ int inuse;
unsigned long maybe_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
unsigned long vote_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
unsigned long response_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
#if 0
/* Code here is included but defined out as it aids debugging */
+#define dlm_print_nodemap(m) _dlm_print_nodemap(m,#m)
+void _dlm_print_nodemap(unsigned long *map, const char *mapname)
+{
+ int i;
+ printk("%s=[ ", mapname);
+ for (i=0; i<O2NM_MAX_NODES; i++)
+ if (test_bit(i, map))
+ printk("%d ", i);
+ printk("]");
+}
+
void dlm_print_one_mle(struct dlm_master_list_entry *mle)
{
- int i = 0, refs;
+ int refs;
char *type;
char attached;
u8 master;
unsigned int namelen;
const char *name;
struct kref *k;
+ unsigned long *maybe = mle->maybe_map,
+ *vote = mle->vote_map,
+ *resp = mle->response_map,
+ *node = mle->node_map;
k = &mle->mle_refs;
if (mle->type == DLM_MLE_BLOCK)
name = mle->u.res->lockname.name;
}
- mlog(ML_NOTICE, " #%3d: %3s %3d %3u %3u %c (%d)%.*s\n",
- i, type, refs, master, mle->new_master, attached,
- namelen, namelen, name);
+ mlog(ML_NOTICE, "%.*s: %3s refs=%3d mas=%3u new=%3u evt=%c inuse=%d ",
+ namelen, name, type, refs, master, mle->new_master, attached,
+ mle->inuse);
+ dlm_print_nodemap(maybe);
+ printk(", ");
+ dlm_print_nodemap(vote);
+ printk(", ");
+ dlm_print_nodemap(resp);
+ printk(", ");
+ dlm_print_nodemap(node);
+ printk(", ");
+ printk("\n");
}
static void dlm_dump_mles(struct dlm_ctxt *dlm)
struct list_head *iter;
mlog(ML_NOTICE, "dumping all mles for domain %s:\n", dlm->name);
- mlog(ML_NOTICE, " ####: type refs owner new events? lockname nodemap votemap respmap maybemap\n");
spin_lock(&dlm->master_lock);
list_for_each(iter, &dlm->master_list) {
mle = list_entry(iter, struct dlm_master_list_entry, list);
spin_unlock(&dlm->spinlock);
}
+static void dlm_get_mle_inuse(struct dlm_master_list_entry *mle)
+{
+ struct dlm_ctxt *dlm;
+ dlm = mle->dlm;
+
+ assert_spin_locked(&dlm->spinlock);
+ assert_spin_locked(&dlm->master_lock);
+ mle->inuse++;
+ kref_get(&mle->mle_refs);
+}
+
+static void dlm_put_mle_inuse(struct dlm_master_list_entry *mle)
+{
+ struct dlm_ctxt *dlm;
+ dlm = mle->dlm;
+
+ spin_lock(&dlm->spinlock);
+ spin_lock(&dlm->master_lock);
+ mle->inuse--;
+ __dlm_put_mle(mle);
+ spin_unlock(&dlm->master_lock);
+ spin_unlock(&dlm->spinlock);
+
+}
+
/* remove from list and free */
static void __dlm_put_mle(struct dlm_master_list_entry *mle)
{
assert_spin_locked(&dlm->spinlock);
assert_spin_locked(&dlm->master_lock);
- BUG_ON(!atomic_read(&mle->mle_refs.refcount));
-
- kref_put(&mle->mle_refs, dlm_mle_release);
+ if (!atomic_read(&mle->mle_refs.refcount)) {
+ /* this may or may not crash, but who cares.
+ * it's a BUG. */
+ mlog(ML_ERROR, "bad mle: %p\n", mle);
+ dlm_print_one_mle(mle);
+ BUG();
+ } else
+ kref_put(&mle->mle_refs, dlm_mle_release);
}
memset(mle->response_map, 0, sizeof(mle->response_map));
mle->master = O2NM_MAX_NODES;
mle->new_master = O2NM_MAX_NODES;
+ mle->inuse = 0;
if (mle->type == DLM_MLE_MASTER) {
BUG_ON(!res);
mlog(0, "destroying lockres %.*s\n", res->lockname.len,
res->lockname.name);
+ if (!hlist_unhashed(&res->hash_node) ||
+ !list_empty(&res->granted) ||
+ !list_empty(&res->converting) ||
+ !list_empty(&res->blocked) ||
+ !list_empty(&res->dirty) ||
+ !list_empty(&res->recovering) ||
+ !list_empty(&res->purge)) {
+ mlog(ML_ERROR,
+ "Going to BUG for resource %.*s."
+ " We're on a list! [%c%c%c%c%c%c%c]\n",
+ res->lockname.len, res->lockname.name,
+ !hlist_unhashed(&res->hash_node) ? 'H' : ' ',
+ !list_empty(&res->granted) ? 'G' : ' ',
+ !list_empty(&res->converting) ? 'C' : ' ',
+ !list_empty(&res->blocked) ? 'B' : ' ',
+ !list_empty(&res->dirty) ? 'D' : ' ',
+ !list_empty(&res->recovering) ? 'R' : ' ',
+ !list_empty(&res->purge) ? 'P' : ' ');
+
+ dlm_print_one_lock_resource(res);
+ }
+
/* By the time we're ready to blow this guy away, we shouldn't
* be on any lists. */
BUG_ON(!hlist_unhashed(&res->hash_node));
kfree(res);
}
-void dlm_lockres_get(struct dlm_lock_resource *res)
-{
- kref_get(&res->refs);
-}
-
void dlm_lockres_put(struct dlm_lock_resource *res)
{
kref_put(&res->refs, dlm_lockres_release);
memcpy(qname, name, namelen);
res->lockname.len = namelen;
- res->lockname.hash = full_name_hash(name, namelen);
+ res->lockname.hash = dlm_lockid_hash(name, namelen);
init_waitqueue_head(&res->wq);
spin_lock_init(&res->spinlock);
int blocked = 0;
int ret, nodenum;
struct dlm_node_iter iter;
- unsigned int namelen;
+ unsigned int namelen, hash;
int tries = 0;
int bit, wait_on_recovery = 0;
BUG_ON(!lockid);
namelen = strlen(lockid);
+ hash = dlm_lockid_hash(lockid, namelen);
mlog(0, "get lockres %s (len %d)\n", lockid, namelen);
lookup:
spin_lock(&dlm->spinlock);
- tmpres = __dlm_lookup_lockres(dlm, lockid, namelen);
+ tmpres = __dlm_lookup_lockres(dlm, lockid, namelen, hash);
if (tmpres) {
spin_unlock(&dlm->spinlock);
mlog(0, "found in hash!\n");
* if so, the creator of the BLOCK may try to put the last
* ref at this time in the assert master handler, so we
* need an extra one to keep from a bad ptr deref. */
- dlm_get_mle(mle);
+ dlm_get_mle_inuse(mle);
spin_unlock(&dlm->master_lock);
spin_unlock(&dlm->spinlock);
dlm_mle_detach_hb_events(dlm, mle);
dlm_put_mle(mle);
/* put the extra ref */
- dlm_put_mle(mle);
+ dlm_put_mle_inuse(mle);
wake_waiters:
spin_lock(&res->spinlock);
"rechecking now\n", dlm->name, res->lockname.len,
res->lockname.name);
goto recheck;
+ } else {
+ if (!voting_done) {
+ mlog(0, "map not changed and voting not done "
+ "for %s:%.*s\n", dlm->name, res->lockname.len,
+ res->lockname.name);
+ }
}
if (m != O2NM_MAX_NODES) {
struct dlm_master_request *request = (struct dlm_master_request *) msg->buf;
struct dlm_master_list_entry *mle = NULL, *tmpmle = NULL;
char *name;
- unsigned int namelen;
+ unsigned int namelen, hash;
int found, ret;
int set_maybe;
int dispatch_assert = 0;
name = request->name;
namelen = request->namelen;
+ hash = dlm_lockid_hash(name, namelen);
if (namelen > DLM_LOCKID_NAME_MAX) {
response = DLM_IVBUFLEN;
way_up_top:
spin_lock(&dlm->spinlock);
- res = __dlm_lookup_lockres(dlm, name, namelen);
+ res = __dlm_lookup_lockres(dlm, name, namelen, hash);
if (res) {
spin_unlock(&dlm->spinlock);
mlog_errno(-ENOMEM);
goto send_response;
}
- spin_lock(&dlm->spinlock);
- dlm_init_mle(mle, DLM_MLE_BLOCK, dlm, NULL,
- name, namelen);
- spin_unlock(&dlm->spinlock);
goto way_up_top;
}
// mlog(0, "this is second time thru, already allocated, "
// "add the block.\n");
+ dlm_init_mle(mle, DLM_MLE_BLOCK, dlm, NULL, name, namelen);
set_bit(request->node_idx, mle->maybe_map);
list_add(&mle->list, &dlm->master_list);
response = DLM_MASTER_RESP_NO;
struct dlm_assert_master *assert = (struct dlm_assert_master *)msg->buf;
struct dlm_lock_resource *res = NULL;
char *name;
- unsigned int namelen;
+ unsigned int namelen, hash;
u32 flags;
int master_request = 0;
int ret = 0;
name = assert->name;
namelen = assert->namelen;
+ hash = dlm_lockid_hash(name, namelen);
flags = be32_to_cpu(assert->flags);
if (namelen > DLM_LOCKID_NAME_MAX) {
if (bit >= O2NM_MAX_NODES) {
/* not necessarily an error, though less likely.
* could be master just re-asserting. */
- mlog(ML_ERROR, "no bits set in the maybe_map, but %u "
+ mlog(0, "no bits set in the maybe_map, but %u "
"is asserting! (%.*s)\n", assert->node_idx,
namelen, name);
} else if (bit != assert->node_idx) {
* number winning the mastery will respond
* YES to mastery requests, but this node
* had no way of knowing. let it pass. */
- mlog(ML_ERROR, "%u is the lowest node, "
+ mlog(0, "%u is the lowest node, "
"%u is asserting. (%.*s) %u must "
"have begun after %u won.\n", bit,
assert->node_idx, namelen, name, bit,
assert->node_idx);
}
}
+ if (mle->type == DLM_MLE_MIGRATION) {
+ if (flags & DLM_ASSERT_MASTER_MLE_CLEANUP) {
+ mlog(0, "%s:%.*s: got cleanup assert"
+ " from %u for migration\n",
+ dlm->name, namelen, name,
+ assert->node_idx);
+ } else if (!(flags & DLM_ASSERT_MASTER_FINISH_MIGRATION)) {
+ mlog(0, "%s:%.*s: got unrelated assert"
+ " from %u for migration, ignoring\n",
+ dlm->name, namelen, name,
+ assert->node_idx);
+ __dlm_put_mle(mle);
+ spin_unlock(&dlm->master_lock);
+ spin_unlock(&dlm->spinlock);
+ goto done;
+ }
+ }
}
spin_unlock(&dlm->master_lock);
/* ok everything checks out with the MLE
* now check to see if there is a lockres */
- res = __dlm_lookup_lockres(dlm, name, namelen);
+ res = __dlm_lookup_lockres(dlm, name, namelen, hash);
if (res) {
spin_lock(&res->spinlock);
if (res->state & DLM_LOCK_RES_RECOVERING) {
goto kill;
}
if (!mle) {
- if (res->owner != assert->node_idx) {
+ if (res->owner != DLM_LOCK_RES_OWNER_UNKNOWN &&
+ res->owner != assert->node_idx) {
mlog(ML_ERROR, "assert_master from "
"%u, but current owner is "
"%u! (%.*s)\n",
if (mle) {
int extra_ref = 0;
int nn = -1;
+ int rr, err = 0;
spin_lock(&mle->spinlock);
if (mle->type == DLM_MLE_BLOCK || mle->type == DLM_MLE_MIGRATION)
wake_up(&mle->wq);
spin_unlock(&mle->spinlock);
- if (mle->type == DLM_MLE_MIGRATION && res) {
- mlog(0, "finishing off migration of lockres %.*s, "
- "from %u to %u\n",
- res->lockname.len, res->lockname.name,
- dlm->node_num, mle->new_master);
+ if (res) {
spin_lock(&res->spinlock);
- res->state &= ~DLM_LOCK_RES_MIGRATING;
- dlm_change_lockres_owner(dlm, res, mle->new_master);
- BUG_ON(res->state & DLM_LOCK_RES_DIRTY);
+ if (mle->type == DLM_MLE_MIGRATION) {
+ mlog(0, "finishing off migration of lockres %.*s, "
+ "from %u to %u\n",
+ res->lockname.len, res->lockname.name,
+ dlm->node_num, mle->new_master);
+ res->state &= ~DLM_LOCK_RES_MIGRATING;
+ dlm_change_lockres_owner(dlm, res, mle->new_master);
+ BUG_ON(res->state & DLM_LOCK_RES_DIRTY);
+ } else {
+ dlm_change_lockres_owner(dlm, res, mle->master);
+ }
spin_unlock(&res->spinlock);
}
- /* master is known, detach if not already detached */
- dlm_mle_detach_hb_events(dlm, mle);
- dlm_put_mle(mle);
-
+
+ /* master is known, detach if not already detached.
+ * ensures that only one assert_master call will happen
+ * on this mle. */
+ spin_lock(&dlm->spinlock);
+ spin_lock(&dlm->master_lock);
+
+ rr = atomic_read(&mle->mle_refs.refcount);
+ if (mle->inuse > 0) {
+ if (extra_ref && rr < 3)
+ err = 1;
+ else if (!extra_ref && rr < 2)
+ err = 1;
+ } else {
+ if (extra_ref && rr < 2)
+ err = 1;
+ else if (!extra_ref && rr < 1)
+ err = 1;
+ }
+ if (err) {
+ mlog(ML_ERROR, "%s:%.*s: got assert master from %u "
+ "that will mess up this node, refs=%d, extra=%d, "
+ "inuse=%d\n", dlm->name, namelen, name,
+ assert->node_idx, rr, extra_ref, mle->inuse);
+ dlm_print_one_mle(mle);
+ }
+ list_del_init(&mle->list);
+ __dlm_mle_detach_hb_events(dlm, mle);
+ __dlm_put_mle(mle);
if (extra_ref) {
/* the assert master message now balances the extra
* ref given by the master / migration request message.
* if this is the last put, it will be removed
* from the list. */
- dlm_put_mle(mle);
+ __dlm_put_mle(mle);
+ }
+ spin_unlock(&dlm->master_lock);
+ spin_unlock(&dlm->spinlock);
+ } else if (res) {
+ if (res->owner != assert->node_idx) {
+ mlog(0, "assert_master from %u, but current "
+ "owner is %u (%.*s), no mle\n", assert->node_idx,
+ res->owner, namelen, name);
}
}
* take both dlm->spinlock and dlm->master_lock */
spin_lock(&dlm->spinlock);
spin_lock(&dlm->master_lock);
- dlm_get_mle(mle);
+ dlm_get_mle_inuse(mle);
spin_unlock(&dlm->master_lock);
spin_unlock(&dlm->spinlock);
/* migration failed, detach and clean up mle */
dlm_mle_detach_hb_events(dlm, mle);
dlm_put_mle(mle);
- dlm_put_mle(mle);
+ dlm_put_mle_inuse(mle);
+ spin_lock(&res->spinlock);
+ res->state &= ~DLM_LOCK_RES_MIGRATING;
+ spin_unlock(&res->spinlock);
goto leave;
}
/* avoid hang during shutdown when migrating lockres
* to a node which also goes down */
if (dlm_is_node_dead(dlm, target)) {
- mlog(0, "%s:%.*s: expected migration target %u "
- "is no longer up. restarting.\n",
+ mlog(0, "%s:%.*s: expected migration "
+ "target %u is no longer up, restarting\n",
dlm->name, res->lockname.len,
res->lockname.name, target);
ret = -ERESTARTSYS;
/* migration failed, detach and clean up mle */
dlm_mle_detach_hb_events(dlm, mle);
dlm_put_mle(mle);
- dlm_put_mle(mle);
+ dlm_put_mle_inuse(mle);
+ spin_lock(&res->spinlock);
+ res->state &= ~DLM_LOCK_RES_MIGRATING;
+ spin_unlock(&res->spinlock);
goto leave;
}
/* TODO: if node died: stop, clean up, return error */
/* master is known, detach if not already detached */
dlm_mle_detach_hb_events(dlm, mle);
- dlm_put_mle(mle);
+ dlm_put_mle_inuse(mle);
ret = 0;
dlm_lockres_calc_usage(dlm, res);
struct dlm_migrate_request *migrate = (struct dlm_migrate_request *) msg->buf;
struct dlm_master_list_entry *mle = NULL, *oldmle = NULL;
const char *name;
- unsigned int namelen;
+ unsigned int namelen, hash;
int ret = 0;
if (!dlm_grab(dlm))
name = migrate->name;
namelen = migrate->namelen;
+ hash = dlm_lockid_hash(name, namelen);
/* preallocate.. if this fails, abort */
mle = (struct dlm_master_list_entry *) kmem_cache_alloc(dlm_mle_cache,
/* check for pre-existing lock */
spin_lock(&dlm->spinlock);
- res = __dlm_lookup_lockres(dlm, name, namelen);
+ res = __dlm_lookup_lockres(dlm, name, namelen, hash);
spin_lock(&dlm->master_lock);
if (res) {
/* remove it from the list so that only one
* mle will be found */
list_del_init(&tmp->list);
+ __dlm_mle_detach_hb_events(dlm, mle);
}
spin_unlock(&tmp->spinlock);
}
struct list_head *iter, *iter2;
struct dlm_master_list_entry *mle;
struct dlm_lock_resource *res;
+ unsigned int hash;
mlog_entry("dlm=%s, dead node=%u\n", dlm->name, dead_node);
top:
/* remove from the list early. NOTE: unlinking
* list_head while in list_for_each_safe */
+ __dlm_mle_detach_hb_events(dlm, mle);
spin_lock(&mle->spinlock);
list_del_init(&mle->list);
atomic_set(&mle->woken, 1);
spin_unlock(&mle->spinlock);
wake_up(&mle->wq);
- mlog(0, "node %u died during migration from "
- "%u to %u!\n", dead_node,
+ mlog(0, "%s: node %u died during migration from "
+ "%u to %u!\n", dlm->name, dead_node,
mle->master, mle->new_master);
/* if there is a lockres associated with this
* mle, find it and set its owner to UNKNOWN */
+ hash = dlm_lockid_hash(mle->u.name.name, mle->u.name.len);
res = __dlm_lookup_lockres(dlm, mle->u.name.name,
- mle->u.name.len);
+ mle->u.name.len, hash);
if (res) {
/* unfortunately if we hit this rare case, our
* lock ordering is messed. we need to drop
projects / linux-2.6-omap-h63xx.git / blobdiff