Per-lockspace option for dlm to run without using a resource
directory. What would be the directory node for a resource is
statically assigned to be the master node instead.
Signed-off-by: David Teigland <[EMAIL PROTECTED]>
Index: linux/drivers/dlm/dir.c
===================================================================
--- linux.orig/drivers/dlm/dir.c
+++ linux/drivers/dlm/dir.c
@@ -72,15 +72,14 @@ void dlm_clear_free_entries(struct dlm_l
*
* To give the exact range wanted (0 to num_nodes-1), we apply a modulus of
* num_nodes to the hash value. This value in the desired range is used as an
- * offset into the sorted list of nodeid's to give the particular nodeid of the
- * directory node.
+ * offset into the sorted list of nodeid's to give the particular nodeid.
*/
-int dlm_dir_name2nodeid(struct dlm_ls *ls, char *name, int length)
+int dlm_hash2nodeid(struct dlm_ls *ls, uint32_t hash)
{
struct list_head *tmp;
struct dlm_member *memb = NULL;
- uint32_t hash, node, n = 0;
+ uint32_t node, n = 0;
int nodeid;
if (ls->ls_num_nodes == 1) {
@@ -88,8 +87,6 @@ int dlm_dir_name2nodeid(struct dlm_ls *l
goto out;
}
- hash = dlm_hash(name, length);
-
if (ls->ls_node_array) {
node = (hash >> 16) % ls->ls_total_weight;
nodeid = ls->ls_node_array[node];
@@ -114,9 +111,9 @@ int dlm_dir_name2nodeid(struct dlm_ls *l
return nodeid;
}
-int dlm_dir_nodeid(struct dlm_rsb *rsb)
+int dlm_dir_nodeid(struct dlm_rsb *r)
{
- return dlm_dir_name2nodeid(rsb->res_ls, rsb->res_name, rsb->res_length);
+ return dlm_hash2nodeid(r->res_ls, r->res_hash);
}
static inline uint32_t dir_hash(struct dlm_ls *ls, char *name, int len)
@@ -202,12 +199,15 @@ int dlm_recover_directory(struct dlm_ls
{
struct dlm_member *memb;
struct dlm_direntry *de;
- char *b, *last_name;
+ char *b, *last_name = NULL;
int error = -ENOMEM, last_len, count = 0;
uint16_t namelen;
log_debug(ls, "dlm_recover_directory");
+ if (dlm_no_directory(ls))
+ goto out_status;
+
dlm_dir_clear(ls);
last_name = kmalloc(DLM_RESNAME_MAXLEN, GFP_KERNEL);
@@ -221,12 +221,12 @@ int dlm_recover_directory(struct dlm_ls
for (;;) {
error = dlm_recovery_stopped(ls);
if (error)
- goto free_last;
+ goto out_free;
error = dlm_rcom_names(ls, memb->nodeid,
last_name, last_len);
if (error)
- goto free_last;
+ goto out_free;
schedule();
@@ -253,7 +253,7 @@ int dlm_recover_directory(struct dlm_ls
error = -ENOMEM;
de = get_free_de(ls, namelen);
if (!de)
- goto free_last;
+ goto out_free;
de->master_nodeid = memb->nodeid;
de->length = namelen;
@@ -270,12 +270,11 @@ int dlm_recover_directory(struct dlm_ls
;
}
- dlm_set_recover_status(ls, DLM_RS_DIR);
+ out_status:
error = 0;
-
+ dlm_set_recover_status(ls, DLM_RS_DIR);
log_debug(ls, "dlm_recover_directory %d entries", count);
-
- free_last:
+ out_free:
kfree(last_name);
out:
dlm_clear_free_entries(ls);
Index: linux/drivers/dlm/dir.h
===================================================================
--- linux.orig/drivers/dlm/dir.h
+++ linux/drivers/dlm/dir.h
@@ -16,7 +16,7 @@
int dlm_dir_nodeid(struct dlm_rsb *rsb);
-int dlm_dir_name2nodeid(struct dlm_ls *ls, char *name, int length);
+int dlm_hash2nodeid(struct dlm_ls *ls, uint32_t hash);
void dlm_dir_remove_entry(struct dlm_ls *ls, int nodeid, char *name, int len);
void dlm_dir_clear(struct dlm_ls *ls);
void dlm_clear_free_entries(struct dlm_ls *ls);
Index: linux/drivers/dlm/dlm_internal.h
===================================================================
--- linux.orig/drivers/dlm/dlm_internal.h
+++ linux/drivers/dlm/dlm_internal.h
@@ -270,6 +270,7 @@ struct dlm_rsb {
int res_length; /* length of rsb name */
int res_nodeid;
uint32_t res_lvbseq;
+ uint32_t res_hash;
uint32_t res_bucket; /* rsbtbl */
unsigned long res_toss_time;
uint32_t res_first_lkid;
@@ -364,6 +365,7 @@ struct dlm_message {
uint32_t m_sbflags;
uint32_t m_flags;
uint32_t m_lvbseq;
+ uint32_t m_hash;
int m_status;
int m_grmode;
int m_rqmode;
@@ -431,6 +433,7 @@ struct rcom_lock {
struct dlm_ls {
struct list_head ls_list; /* list of lockspaces */
uint32_t ls_global_id; /* global unique lockspace ID */
+ uint32_t ls_exflags;
int ls_lvblen;
int ls_count; /* reference count */
unsigned long ls_flags; /* LSFL_ */
@@ -507,5 +510,10 @@ static inline int dlm_recovery_stopped(s
return test_bit(LSFL_RECOVERY_STOP, &ls->ls_flags);
}
+static inline int dlm_no_directory(struct dlm_ls *ls)
+{
+ return (ls->ls_exflags & DLM_LSFL_NODIR) ? 1 : 0;
+}
+
#endif /* __DLM_INTERNAL_DOT_H__ */
Index: linux/drivers/dlm/lock.c
===================================================================
--- linux.orig/drivers/dlm/lock.c
+++ linux/drivers/dlm/lock.c
@@ -317,6 +317,9 @@ static int _search_rsb(struct dlm_ls *ls
list_move(&r->res_hashchain, &ls->ls_rsbtbl[b].list);
+ if (dlm_no_directory(ls))
+ goto out;
+
if (r->res_nodeid == -1) {
rsb_clear_flag(r, RSB_MASTER_UNCERTAIN);
r->res_first_lkid = 0;
@@ -360,11 +363,14 @@ static int find_rsb(struct dlm_ls *ls, c
unsigned int flags, struct dlm_rsb **r_ret)
{
struct dlm_rsb *r, *tmp;
- uint32_t bucket;
+ uint32_t hash, bucket;
int error = 0;
- bucket = dlm_hash(name, namelen);
- bucket &= (ls->ls_rsbtbl_size - 1);
+ if (dlm_no_directory(ls))
+ flags |= R_CREATE;
+
+ hash = dlm_hash(name, namelen);
+ bucket = hash & (ls->ls_rsbtbl_size - 1);
error = search_rsb(ls, name, namelen, bucket, flags, &r);
if (!error)
@@ -382,10 +388,19 @@ static int find_rsb(struct dlm_ls *ls, c
if (!r)
goto out;
+ r->res_hash = hash;
r->res_bucket = bucket;
r->res_nodeid = -1;
kref_init(&r->res_ref);
+ /* With no directory, the master can be set immediately */
+ if (dlm_no_directory(ls)) {
+ int nodeid = dlm_dir_nodeid(r);
+ if (nodeid == dlm_our_nodeid())
+ nodeid = 0;
+ r->res_nodeid = nodeid;
+ }
+
write_lock(&ls->ls_rsbtbl[bucket].lock);
error = _search_rsb(ls, name, namelen, bucket, 0, &tmp);
if (!error) {
@@ -743,8 +758,12 @@ int dlm_remove_from_waiters(struct dlm_l
static void dir_remove(struct dlm_rsb *r)
{
- int to_nodeid = dlm_dir_nodeid(r);
+ int to_nodeid;
+
+ if (dlm_no_directory(r->res_ls))
+ return;
+ to_nodeid = dlm_dir_nodeid(r);
if (to_nodeid != dlm_our_nodeid())
send_remove(r);
else
@@ -2124,6 +2143,7 @@ static void send_args(struct dlm_rsb *r,
ms->m_status = lkb->lkb_status;
ms->m_grmode = lkb->lkb_grmode;
ms->m_rqmode = lkb->lkb_rqmode;
+ ms->m_hash = r->res_hash;
/* m_result and m_bastmode are set from function args,
not from lkb fields */
@@ -2288,6 +2308,7 @@ static int send_remove(struct dlm_rsb *r
goto out;
memcpy(ms->m_extra, r->res_name, r->res_length);
+ ms->m_hash = r->res_hash;
error = send_message(mh, ms);
out:
@@ -2691,7 +2712,7 @@ static void receive_lookup(struct dlm_ls
len = receive_extralen(ms);
- dir_nodeid = dlm_dir_name2nodeid(ls, ms->m_extra, len);
+ dir_nodeid = dlm_hash2nodeid(ls, ms->m_hash);
if (dir_nodeid != our_nodeid) {
log_error(ls, "lookup dir_nodeid %d from %d",
dir_nodeid, from_nodeid);
@@ -2719,7 +2740,7 @@ static void receive_remove(struct dlm_ls
len = receive_extralen(ms);
- dir_nodeid = dlm_dir_name2nodeid(ls, ms->m_extra, len);
+ dir_nodeid = dlm_hash2nodeid(ls, ms->m_hash);
if (dir_nodeid != dlm_our_nodeid()) {
log_error(ls, "remove dir entry dir_nodeid %d from %d",
dir_nodeid, from_nodeid);
@@ -3156,6 +3177,23 @@ static void recover_convert_waiter(struc
conversions are async; there's no reply from the remote master */
}
+/* A waiting lkb needs recovery if the master node has failed, or
+ the master node is changing (only when no directory is used) */
+
+static int waiter_needs_recovery(struct dlm_ls *ls, struct dlm_lkb *lkb)
+{
+ if (dlm_is_removed(ls, lkb->lkb_nodeid))
+ return 1;
+
+ if (!dlm_no_directory(ls))
+ return 0;
+
+ if (dlm_dir_nodeid(lkb->lkb_resource) != lkb->lkb_nodeid)
+ return 1;
+
+ return 0;
+}
+
/* Recovery for locks that are waiting for replies from nodes that are now
gone. We can just complete unlocks and cancels by faking a reply from the
dead node. Requests and up-conversions we flag to be resent after
@@ -3180,7 +3218,7 @@ void dlm_recover_waiters_pre(struct dlm_
continue;
}
- if (!dlm_is_removed(ls, lkb->lkb_nodeid))
+ if (!waiter_needs_recovery(ls, lkb))
continue;
switch (lkb->lkb_wait_type) {
@@ -3322,6 +3360,11 @@ static int purge_dead_test(struct dlm_ls
return (is_master_copy(lkb) && dlm_is_removed(ls, lkb->lkb_nodeid));
}
+static int purge_mstcpy_test(struct dlm_ls *ls, struct dlm_lkb *lkb)
+{
+ return is_master_copy(lkb);
+}
+
static void purge_dead_locks(struct dlm_rsb *r)
{
purge_queue(r, &r->res_grantqueue, &purge_dead_test);
@@ -3329,6 +3372,13 @@ static void purge_dead_locks(struct dlm_
purge_queue(r, &r->res_waitqueue, &purge_dead_test);
}
+void dlm_purge_mstcpy_locks(struct dlm_rsb *r)
+{
+ purge_queue(r, &r->res_grantqueue, &purge_mstcpy_test);
+ purge_queue(r, &r->res_convertqueue, &purge_mstcpy_test);
+ purge_queue(r, &r->res_waitqueue, &purge_mstcpy_test);
+}
+
/* Get rid of locks held by nodes that are gone. */
int dlm_purge_locks(struct dlm_ls *ls)
Index: linux/drivers/dlm/lock.h
===================================================================
--- linux.orig/drivers/dlm/lock.h
+++ linux/drivers/dlm/lock.h
@@ -26,6 +26,7 @@ int dlm_remove_from_waiters(struct dlm_l
void dlm_scan_rsbs(struct dlm_ls *ls);
int dlm_purge_locks(struct dlm_ls *ls);
+void dlm_purge_mstcpy_locks(struct dlm_rsb *r);
int dlm_grant_after_purge(struct dlm_ls *ls);
int dlm_recover_waiters_post(struct dlm_ls *ls);
void dlm_recover_waiters_pre(struct dlm_ls *ls);
Index: linux/drivers/dlm/lockspace.c
===================================================================
--- linux.orig/drivers/dlm/lockspace.c
+++ linux/drivers/dlm/lockspace.c
@@ -185,8 +185,8 @@ static void threads_stop(void)
dlm_astd_stop();
}
-static int new_lockspace(char *name, int namelen, void **lockspace, int flags,
- int lvblen)
+static int new_lockspace(char *name, int namelen, void **lockspace,
+ uint32_t flags, int lvblen)
{
struct dlm_ls *ls;
int i, size, error = -ENOMEM;
@@ -213,6 +213,7 @@ static int new_lockspace(char *name, int
memset(ls, 0, sizeof(struct dlm_ls) + namelen);
memcpy(ls->ls_name, name, namelen);
ls->ls_namelen = namelen;
+ ls->ls_exflags = flags;
ls->ls_lvblen = lvblen;
ls->ls_count = 0;
ls->ls_flags = 0;
@@ -345,8 +346,8 @@ static int new_lockspace(char *name, int
return error;
}
-int dlm_new_lockspace(char *name, int namelen, void **lockspace, int flags,
- int lvblen)
+int dlm_new_lockspace(char *name, int namelen, void **lockspace,
+ uint32_t flags, int lvblen)
{
int error = 0;
Index: linux/drivers/dlm/rcom.c
===================================================================
--- linux.orig/drivers/dlm/rcom.c
+++ linux/drivers/dlm/rcom.c
@@ -75,12 +75,18 @@ static void send_rcom(struct dlm_ls *ls,
static void make_config(struct dlm_ls *ls, struct rcom_config *rf)
{
rf->rf_lvblen = ls->ls_lvblen;
+ rf->rf_lsflags = ls->ls_exflags;
}
static int check_config(struct dlm_ls *ls, struct rcom_config *rf)
{
- if (rf->rf_lvblen != ls->ls_lvblen)
+ if (rf->rf_lvblen != ls->ls_lvblen ||
+ rf->rf_lsflags != ls->ls_exflags) {
+ log_error(ls, "config mismatch %d,%d %x,%x",
+ rf->rf_lvblen, ls->ls_lvblen,
+ rf->rf_lsflags, ls->ls_exflags);
return -EINVAL;
+ }
return 0;
}
Index: linux/drivers/dlm/recover.c
===================================================================
--- linux.orig/drivers/dlm/recover.c
+++ linux/drivers/dlm/recover.c
@@ -60,8 +60,10 @@ int dlm_wait_function(struct dlm_ls *ls,
wait_event(ls->ls_wait_general, testfn(ls) || dlm_recovery_stopped(ls));
del_timer_sync(&ls->ls_timer);
- if (dlm_recovery_stopped(ls))
+ if (dlm_recovery_stopped(ls)) {
+ log_debug(ls, "dlm_wait_function aborted");
error = -EINTR;
+ }
return error;
}
@@ -98,9 +100,10 @@ static int wait_status_all(struct dlm_ls
list_for_each_entry(memb, &ls->ls_nodes, list) {
delay = 0;
for (;;) {
- error = dlm_recovery_stopped(ls);
- if (error)
+ if (dlm_recovery_stopped(ls)) {
+ error = -EINTR;
goto out;
+ }
error = dlm_rcom_status(ls, memb->nodeid);
if (error)
@@ -123,9 +126,10 @@ static int wait_status_low(struct dlm_ls
int error = 0, delay = 0, nodeid = ls->ls_low_nodeid;
for (;;) {
- error = dlm_recovery_stopped(ls);
- if (error)
+ if (dlm_recovery_stopped(ls)) {
+ error = -EINTR;
goto out;
+ }
error = dlm_rcom_status(ls, nodeid);
if (error)
@@ -306,14 +310,8 @@ static void set_master_lkbs(struct dlm_r
static void set_new_master(struct dlm_rsb *r, int nodeid)
{
lock_rsb(r);
-
- if (nodeid == dlm_our_nodeid())
- r->res_nodeid = 0;
- else
- r->res_nodeid = nodeid;
-
+ r->res_nodeid = nodeid;
set_master_lkbs(r);
-
rsb_set_flag(r, RSB_NEW_MASTER);
rsb_set_flag(r, RSB_NEW_MASTER2);
unlock_rsb(r);
@@ -337,6 +335,8 @@ static int recover_master(struct dlm_rsb
if (error)
log_error(ls, "recover dir lookup error %d", error);
+ if (ret_nodeid == our_nodeid)
+ ret_nodeid = 0;
set_new_master(r, ret_nodeid);
} else {
recover_list_add(r);
@@ -347,6 +347,27 @@ static int recover_master(struct dlm_rsb
}
/*
+ * When not using a directory, most resource names will hash to a new static
+ * master nodeid and the resource will need to be remastered.
+ */
+
+static int recover_master_static(struct dlm_rsb *r)
+{
+ int master = dlm_dir_nodeid(r);
+
+ if (master == dlm_our_nodeid())
+ master = 0;
+
+ if (r->res_nodeid != master) {
+ if (is_master(r))
+ dlm_purge_mstcpy_locks(r);
+ set_new_master(r, master);
+ return 1;
+ }
+ return 0;
+}
+
+/*
* Go through local root resources and for each rsb which has a master which
* has departed, get the new master nodeid from the directory. The dir will
* assign mastery to the first node to look up the new master. That means
@@ -359,22 +380,21 @@ static int recover_master(struct dlm_rsb
int dlm_recover_masters(struct dlm_ls *ls)
{
struct dlm_rsb *r;
- int error, count = 0;
+ int error = 0, count = 0;
log_debug(ls, "dlm_recover_masters");
down_read(&ls->ls_root_sem);
list_for_each_entry(r, &ls->ls_root_list, res_root_list) {
- if (is_master(r))
- continue;
-
- error = dlm_recovery_stopped(ls);
- if (error) {
+ if (dlm_recovery_stopped(ls)) {
up_read(&ls->ls_root_sem);
+ error = -EINTR;
goto out;
}
- if (dlm_is_removed(ls, r->res_nodeid)) {
+ if (dlm_no_directory(ls))
+ count += recover_master_static(r);
+ else if (!is_master(r) && dlm_is_removed(ls, r->res_nodeid)) {
recover_master(r);
count++;
}
@@ -395,6 +415,7 @@ int dlm_recover_masters(struct dlm_ls *l
int dlm_recover_master_reply(struct dlm_ls *ls, struct dlm_rcom *rc)
{
struct dlm_rsb *r;
+ int nodeid;
r = recover_list_find(ls, rc->rc_id);
if (!r) {
@@ -403,7 +424,11 @@ int dlm_recover_master_reply(struct dlm_
goto out;
}
- set_new_master(r, rc->rc_result);
+ nodeid = rc->rc_result;
+ if (nodeid == dlm_our_nodeid())
+ nodeid = 0;
+
+ set_new_master(r, nodeid);
recover_list_del(r);
if (recover_list_empty(ls))
@@ -499,8 +524,8 @@ int dlm_recover_locks(struct dlm_ls *ls)
if (!rsb_flag(r, RSB_NEW_MASTER))
continue;
- error = dlm_recovery_stopped(ls);
- if (error) {
+ if (dlm_recovery_stopped(ls)) {
+ error = -EINTR;
up_read(&ls->ls_root_sem);
goto out;
}
Index: linux/drivers/dlm/recoverd.c
===================================================================
--- linux.orig/drivers/dlm/recoverd.c
+++ linux/drivers/dlm/recoverd.c
@@ -122,7 +122,7 @@ static int ls_recover(struct dlm_ls *ls,
if (error)
goto fail;
- if (neg) {
+ if (neg || dlm_no_directory(ls)) {
/*
* Clear lkb's for departed nodes.
*/
Index: linux/drivers/dlm/requestqueue.c
===================================================================
--- linux.orig/drivers/dlm/requestqueue.c
+++ linux/drivers/dlm/requestqueue.c
@@ -13,6 +13,8 @@
#include "dlm_internal.h"
#include "member.h"
#include "lock.h"
+#include "dir.h"
+#include "lowcomms.h"
struct rq_entry {
struct list_head list;
@@ -113,28 +115,65 @@ void dlm_wait_requestqueue(struct dlm_ls
up(&ls->ls_requestqueue_lock);
}
-/*
- * Dir lookups and lookup replies send before recovery are invalid because the
- * directory is rebuilt during recovery, so don't save any requests of this
- * type. Don't save any requests from a node that's being removed either.
- */
+static int purge_request(struct dlm_ls *ls, struct dlm_message *ms, int nodeid)
+{
+ uint32_t type = ms->m_type;
+
+ if (dlm_is_removed(ls, nodeid))
+ return 1;
+
+ /* directory operations are always purged because the directory is
+ always rebuilt during recovery and the lookups resent */
+
+ if (type == DLM_MSG_REMOVE ||
+ type == DLM_MSG_LOOKUP ||
+ type == DLM_MSG_LOOKUP_REPLY)
+ return 1;
+
+ if (!dlm_no_directory(ls))
+ return 0;
+
+ /* with no directory, the master is likely to change as a part of
+ recovery; requests to/from the defunct master need to be purged */
+
+ switch (type) {
+ case DLM_MSG_REQUEST:
+ case DLM_MSG_CONVERT:
+ case DLM_MSG_UNLOCK:
+ case DLM_MSG_CANCEL:
+ /* we're no longer the master of this resource, the sender
+ will resend to the new master (see waiter_needs_recovery) */
+
+ if (dlm_hash2nodeid(ls, ms->m_hash) != dlm_our_nodeid())
+ return 1;
+ break;
+
+ case DLM_MSG_REQUEST_REPLY:
+ case DLM_MSG_CONVERT_REPLY:
+ case DLM_MSG_UNLOCK_REPLY:
+ case DLM_MSG_CANCEL_REPLY:
+ case DLM_MSG_GRANT:
+ /* this reply is from the former master of the resource,
+ we'll resend to the new master if needed */
+
+ if (dlm_hash2nodeid(ls, ms->m_hash) != nodeid)
+ return 1;
+ break;
+ }
+
+ return 0;
+}
void dlm_purge_requestqueue(struct dlm_ls *ls)
{
struct dlm_message *ms;
struct rq_entry *e, *safe;
- uint32_t mstype;
down(&ls->ls_requestqueue_lock);
list_for_each_entry_safe(e, safe, &ls->ls_requestqueue, list) {
-
ms = (struct dlm_message *) e->request;
- mstype = ms->m_type;
- if (dlm_is_removed(ls, e->nodeid) ||
- mstype == DLM_MSG_REMOVE ||
- mstype == DLM_MSG_LOOKUP ||
- mstype == DLM_MSG_LOOKUP_REPLY) {
+ if (purge_request(ls, ms, e->nodeid)) {
list_del(&e->list);
kfree(e);
}
Index: linux/drivers/dlm/util.c
===================================================================
--- linux.orig/drivers/dlm/util.c
+++ linux/drivers/dlm/util.c
@@ -80,6 +80,7 @@ void dlm_message_out(struct dlm_message
ms->m_sbflags = cpu_to_le32(ms->m_sbflags);
ms->m_flags = cpu_to_le32(ms->m_flags);
ms->m_lvbseq = cpu_to_le32(ms->m_lvbseq);
+ ms->m_hash = cpu_to_le32(ms->m_hash);
ms->m_status = cpu_to_le32(ms->m_status);
ms->m_grmode = cpu_to_le32(ms->m_grmode);
ms->m_rqmode = cpu_to_le32(ms->m_rqmode);
@@ -107,6 +108,7 @@ void dlm_message_in(struct dlm_message *
ms->m_sbflags = le32_to_cpu(ms->m_sbflags);
ms->m_flags = le32_to_cpu(ms->m_flags);
ms->m_lvbseq = le32_to_cpu(ms->m_lvbseq);
+ ms->m_hash = le32_to_cpu(ms->m_hash);
ms->m_status = le32_to_cpu(ms->m_status);
ms->m_grmode = le32_to_cpu(ms->m_grmode);
ms->m_rqmode = le32_to_cpu(ms->m_rqmode);
Index: linux/include/linux/dlm.h
===================================================================
--- linux.orig/include/linux/dlm.h
+++ linux/include/linux/dlm.h
@@ -204,6 +204,8 @@ struct dlm_lksb {
#ifdef __KERNEL__
+#define DLM_LSFL_NODIR 0x00000001
+
/*
* dlm_new_lockspace
*
@@ -212,7 +214,7 @@ struct dlm_lksb {
*/
int dlm_new_lockspace(char *name, int namelen, dlm_lockspace_t **lockspace,
- int flags, int lvblen);
+ uint32_t flags, int lvblen);
/*
* dlm_release_lockspace
--
-
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