static int dlm_purge_lockres(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res)
{
int master;
int ret = 0;
spin_lock(&res->spinlock);
if (!__dlm_lockres_unused(res)) {
spin_unlock(&res->spinlock);
mlog(0, "%s:%.*s: tried to purge but not unused\n",
dlm->name, res->lockname.len, res->lockname.name);
return -ENOTEMPTY;
}
master = (res->owner == dlm->node_num);
if (!master)
res->state |= DLM_LOCK_RES_DROPPING_REF;
spin_unlock(&res->spinlock);
mlog(0, "purging lockres %.*s, master = %d\n", res->lockname.len,
res->lockname.name, master);
if (!master) {
spin_lock(&res->spinlock);
/* This ensures that clear refmap is sent after the set */
__dlm_wait_on_lockres_flags(res, DLM_LOCK_RES_SETREF_INPROG);
spin_unlock(&res->spinlock);
/* drop spinlock to do messaging, retake below */
spin_unlock(&dlm->spinlock);
/* clear our bit from the master's refmap, ignore errors */
ret = dlm_drop_lockres_ref(dlm, res);
if (ret < 0) {
mlog_errno(ret);
if (!dlm_is_host_down(ret))
BUG();
}
mlog(0, "%s:%.*s: dlm_deref_lockres returned %d\n",
dlm->name, res->lockname.len, res->lockname.name, ret);
spin_lock(&dlm->spinlock);
}
if (!list_empty(&res->purge)) {
mlog(0, "removing lockres %.*s:%p from purgelist, "
"master = %d\n", res->lockname.len, res->lockname.name,
res, master);
list_del_init(&res->purge);
dlm_lockres_put(res);
dlm->purge_count--;
}
__dlm_unhash_lockres(res);
/* lockres is not in the hash now. drop the flag and wake up
* any processes waiting in dlm_get_lock_resource. */
if (!master) {
spin_lock(&res->spinlock);
res->state &= ~DLM_LOCK_RES_DROPPING_REF;
spin_unlock(&res->spinlock);
wake_up(&res->wq);
}
return 0;
}
static void dlm_purge_lockres(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res)
{
int master;
int ret = 0;
assert_spin_locked(&dlm->spinlock);
assert_spin_locked(&res->spinlock);
master = (res->owner == dlm->node_num);
mlog(0, "%s: Purging res %.*s, master %d\n", dlm->name,
res->lockname.len, res->lockname.name, master);
if (!master) {
res->state |= DLM_LOCK_RES_DROPPING_REF;
spin_unlock(&res->spinlock);
spin_unlock(&dlm->spinlock);
spin_lock(&res->spinlock);
__dlm_wait_on_lockres_flags(res, DLM_LOCK_RES_SETREF_INPROG);
spin_unlock(&res->spinlock);
ret = dlm_drop_lockres_ref(dlm, res);
if (ret < 0) {
if (!dlm_is_host_down(ret))
BUG();
}
spin_lock(&dlm->spinlock);
spin_lock(&res->spinlock);
}
if (!list_empty(&res->purge)) {
mlog(0, "%s: Removing res %.*s from purgelist, master %d\n",
dlm->name, res->lockname.len, res->lockname.name, master);
list_del_init(&res->purge);
dlm_lockres_put(res);
dlm->purge_count--;
}
if (!__dlm_lockres_unused(res)) {
mlog(ML_ERROR, "%s: res %.*s in use after deref\n",
dlm->name, res->lockname.len, res->lockname.name);
__dlm_print_one_lock_resource(res);
BUG();
}
__dlm_unhash_lockres(dlm, res);
if (!master) {
res->state &= ~DLM_LOCK_RES_DROPPING_REF;
spin_unlock(&res->spinlock);
wake_up(&res->wq);
} else
spin_unlock(&res->spinlock);
}
/*
* locking:
* caller needs: none
* taken: none
* held on exit: none
* returns: DLM_NORMAL, DLM_NOLOCKMGR, status from network
*/
static enum dlm_status dlm_send_remote_unlock_request(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res,
struct dlm_lock *lock,
struct dlm_lockstatus *lksb,
int flags,
u8 owner)
{
struct dlm_unlock_lock unlock;
int tmpret;
enum dlm_status ret;
int status = 0;
struct kvec vec[2];
size_t veclen = 1;
mlog_entry("%.*s\n", res->lockname.len, res->lockname.name);
if (owner == dlm->node_num) {
/* ended up trying to contact ourself. this means
* that the lockres had been remote but became local
* via a migration. just retry it, now as local */
mlog(0, "%s:%.*s: this node became the master due to a "
"migration, re-evaluate now\n", dlm->name,
res->lockname.len, res->lockname.name);
return DLM_FORWARD;
}
memset(&unlock, 0, sizeof(unlock));
unlock.node_idx = dlm->node_num;
unlock.flags = cpu_to_be32(flags);
unlock.cookie = lock->ml.cookie;
unlock.namelen = res->lockname.len;
memcpy(unlock.name, res->lockname.name, unlock.namelen);
vec[0].iov_len = sizeof(struct dlm_unlock_lock);
vec[0].iov_base = &unlock;
if (flags & LKM_PUT_LVB) {
/* extra data to send if we are updating lvb */
vec[1].iov_len = DLM_LVB_LEN;
vec[1].iov_base = lock->lksb->lvb;
veclen++;
}
tmpret = o2net_send_message_vec(DLM_UNLOCK_LOCK_MSG, dlm->key,
vec, veclen, owner, &status);
if (tmpret >= 0) {
// successfully sent and received
if (status == DLM_FORWARD)
mlog(0, "master was in-progress. retry\n");
ret = status;
} else {
mlog_errno(tmpret);
if (dlm_is_host_down(tmpret)) {
/* NOTE: this seems strange, but it is what we want.
* when the master goes down during a cancel or
* unlock, the recovery code completes the operation
* as if the master had not died, then passes the
* updated state to the recovery master. this thread
* just needs to finish out the operation and call
* the unlockast. */
ret = DLM_NORMAL;
} else {
/* something bad. this will BUG in ocfs2 */
ret = dlm_err_to_dlm_status(tmpret);
}
}
return ret;
}
static void dlm_purge_lockres(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res)
{
int master;
int ret = 0;
assert_spin_locked(&dlm->spinlock);
assert_spin_locked(&res->spinlock);
master = (res->owner == dlm->node_num);
mlog(0, "%s: Purging res %.*s, master %d\n", dlm->name,
res->lockname.len, res->lockname.name, master);
if (!master) {
res->state |= DLM_LOCK_RES_DROPPING_REF;
/* drop spinlock... retake below */
spin_unlock(&res->spinlock);
spin_unlock(&dlm->spinlock);
spin_lock(&res->spinlock);
/* This ensures that clear refmap is sent after the set */
__dlm_wait_on_lockres_flags(res, DLM_LOCK_RES_SETREF_INPROG);
spin_unlock(&res->spinlock);
/* clear our bit from the master's refmap, ignore errors */
ret = dlm_drop_lockres_ref(dlm, res);
if (ret < 0) {
if (!dlm_is_host_down(ret))
BUG();
}
spin_lock(&dlm->spinlock);
spin_lock(&res->spinlock);
}
if (!list_empty(&res->purge)) {
mlog(0, "%s: Removing res %.*s from purgelist, master %d\n",
dlm->name, res->lockname.len, res->lockname.name, master);
list_del_init(&res->purge);
dlm_lockres_put(res);
dlm->purge_count--;
}
if (!__dlm_lockres_unused(res)) {
mlog(ML_ERROR, "%s: res %.*s in use after deref\n",
dlm->name, res->lockname.len, res->lockname.name);
__dlm_print_one_lock_resource(res);
BUG();
}
__dlm_unhash_lockres(dlm, res);
/* lockres is not in the hash now. drop the flag and wake up
* any processes waiting in dlm_get_lock_resource. */
if (!master) {
res->state &= ~DLM_LOCK_RES_DROPPING_REF;
spin_unlock(&res->spinlock);
wake_up(&res->wq);
} else
spin_unlock(&res->spinlock);
}
