Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm:
  dlm: make plock operation killable
  dlm: remove shared message stub for recovery
  dlm: delayed reply message warning
  dlm: Remove superfluous call to recalc_sigpending()

9 files changed, 223 insertions, 51 deletions

diff --git a/fs/dlm/config.c b/fs/dlm/config.c
index 0d329ff8ed4c..9b026ea8baa9 100644
--- a/fs/dlm/config.c
+++ b/fs/dlm/config.c
@@ -100,6 +100,7 @@ struct dlm_cluster {
         unsigned int cl_log_debug;
         unsigned int cl_protocol;
         unsigned int cl_timewarn_cs;
+        unsigned int cl_waitwarn_us;
 };
 
 enum {
@@ -114,6 +115,7 @@ enum {
         CLUSTER_ATTR_LOG_DEBUG,
         CLUSTER_ATTR_PROTOCOL,
         CLUSTER_ATTR_TIMEWARN_CS,
+        CLUSTER_ATTR_WAITWARN_US,
 };
 
 struct cluster_attribute {
@@ -166,6 +168,7 @@ CLUSTER_ATTR(scan_secs, 1);
 CLUSTER_ATTR(log_debug, 0);
 CLUSTER_ATTR(protocol, 0);
 CLUSTER_ATTR(timewarn_cs, 1);
+CLUSTER_ATTR(waitwarn_us, 0);
 
 static struct configfs_attribute *cluster_attrs[] = {
         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr,
@@ -179,6 +182,7 @@ static struct configfs_attribute *cluster_attrs[] = {
         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.attr,
         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol.attr,
         [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs.attr,
+        [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us.attr,
         NULL,
 };
 
@@ -439,6 +443,7 @@ static struct config_group *make_cluster(struct config_group *g,
         cl->cl_log_debug = dlm_config.ci_log_debug;
         cl->cl_protocol = dlm_config.ci_protocol;
         cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
+        cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
 
         space_list = &sps->ss_group;
         comm_list = &cms->cs_group;
@@ -986,6 +991,7 @@ int dlm_our_addr(struct sockaddr_storage *addr, int num)
 #define DEFAULT_LOG_DEBUG          0
 #define DEFAULT_PROTOCOL           0
 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
+#define DEFAULT_WAITWARN_US        0
 
 struct dlm_config_info dlm_config = {
         .ci_tcp_port = DEFAULT_TCP_PORT,
@@ -998,6 +1004,7 @@ struct dlm_config_info dlm_config = {
         .ci_scan_secs = DEFAULT_SCAN_SECS,
         .ci_log_debug = DEFAULT_LOG_DEBUG,
         .ci_protocol = DEFAULT_PROTOCOL,
-        .ci_timewarn_cs = DEFAULT_TIMEWARN_CS
+        .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
+        .ci_waitwarn_us = DEFAULT_WAITWARN_US
 };
 
diff --git a/fs/dlm/config.h b/fs/dlm/config.h
index 4f1d6fce58c5..dd0ce24d5a80 100644
--- a/fs/dlm/config.h
+++ b/fs/dlm/config.h
@@ -28,6 +28,7 @@ struct dlm_config_info {
         int ci_log_debug;
         int ci_protocol;
         int ci_timewarn_cs;
+        int ci_waitwarn_us;
 };
 
 extern struct dlm_config_info dlm_config;
diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
index b94204913011..0262451eb9c6 100644
--- a/fs/dlm/dlm_internal.h
+++ b/fs/dlm/dlm_internal.h
@@ -209,6 +209,7 @@ struct dlm_args {
 #define DLM_IFL_WATCH_TIMEWARN  0x00400000
 #define DLM_IFL_TIMEOUT_CANCEL  0x00800000
 #define DLM_IFL_DEADLOCK_CANCEL 0x01000000
+#define DLM_IFL_STUB_MS         0x02000000 /* magic number for m_flags */
 #define DLM_IFL_USER            0x00000001
 #define DLM_IFL_ORPHAN          0x00000002
 
@@ -245,6 +246,7 @@ struct dlm_lkb {
 
         int8_t                  lkb_wait_type;  /* type of reply waiting for */
         int8_t                  lkb_wait_count;
+        int                     lkb_wait_nodeid; /* for debugging */
 
         struct list_head        lkb_idtbl_list; /* lockspace lkbtbl */
         struct list_head        lkb_statequeue; /* rsb g/c/w list */
@@ -254,6 +256,7 @@ struct dlm_lkb {
         struct list_head        lkb_ownqueue;   /* list of locks for a process */
         struct list_head        lkb_time_list;
         ktime_t                 lkb_timestamp;
+        ktime_t                 lkb_wait_time;
         unsigned long           lkb_timeout_cs;
 
         struct dlm_callback     lkb_callbacks[DLM_CALLBACKS_SIZE];
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index 56d6bfcc1e48..f71d0b5abd95 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -799,10 +799,84 @@ static int msg_reply_type(int mstype)
         return -1;
 }
 
+static int nodeid_warned(int nodeid, int num_nodes, int *warned)
+{
+        int i;
+
+        for (i = 0; i < num_nodes; i++) {
+                if (!warned[i]) {
+                        warned[i] = nodeid;
+                        return 0;
+                }
+                if (warned[i] == nodeid)
+                        return 1;
+        }
+        return 0;
+}
+
+void dlm_scan_waiters(struct dlm_ls *ls)
+{
+        struct dlm_lkb *lkb;
+        ktime_t zero = ktime_set(0, 0);
+        s64 us;
+        s64 debug_maxus = 0;
+        u32 debug_scanned = 0;
+        u32 debug_expired = 0;
+        int num_nodes = 0;
+        int *warned = NULL;
+
+        if (!dlm_config.ci_waitwarn_us)
+                return;
+
+        mutex_lock(&ls->ls_waiters_mutex);
+
+        list_for_each_entry(lkb, &ls->ls_waiters, lkb_wait_reply) {
+                if (ktime_equal(lkb->lkb_wait_time, zero))
+                        continue;
+
+                debug_scanned++;
+
+                us = ktime_to_us(ktime_sub(ktime_get(), lkb->lkb_wait_time));
+
+                if (us < dlm_config.ci_waitwarn_us)
+                        continue;
+
+                lkb->lkb_wait_time = zero;
+
+                debug_expired++;
+                if (us > debug_maxus)
+                        debug_maxus = us;
+
+                if (!num_nodes) {
+                        num_nodes = ls->ls_num_nodes;
+                        warned = kmalloc(GFP_KERNEL, num_nodes * sizeof(int));
+                        if (warned)
+                                memset(warned, 0, num_nodes * sizeof(int));
+                }
+                if (!warned)
+                        continue;
+                if (nodeid_warned(lkb->lkb_wait_nodeid, num_nodes, warned))
+                        continue;
+
+                log_error(ls, "waitwarn %x %lld %d us check connection to "
+                          "node %d", lkb->lkb_id, (long long)us,
+                          dlm_config.ci_waitwarn_us, lkb->lkb_wait_nodeid);
+        }
+        mutex_unlock(&ls->ls_waiters_mutex);
+
+        if (warned)
+                kfree(warned);
+
+        if (debug_expired)
+                log_debug(ls, "scan_waiters %u warn %u over %d us max %lld us",
+                          debug_scanned, debug_expired,
+                          dlm_config.ci_waitwarn_us, (long long)debug_maxus);
+}
+
 /* add/remove lkb from global waiters list of lkb's waiting for
    a reply from a remote node */
 
-static int add_to_waiters(struct dlm_lkb *lkb, int mstype)
+static int add_to_waiters(struct dlm_lkb *lkb, int mstype, int to_nodeid)
 {
         struct dlm_ls *ls = lkb->lkb_resource->res_ls;
         int error = 0;
@@ -842,6 +916,8 @@ static int add_to_waiters(struct dlm_lkb *lkb, int mstype)
 
         lkb->lkb_wait_count++;
         lkb->lkb_wait_type = mstype;
+        lkb->lkb_wait_time = ktime_get();
+        lkb->lkb_wait_nodeid = to_nodeid; /* for debugging */
         hold_lkb(lkb);
         list_add(&lkb->lkb_wait_reply, &ls->ls_waiters);
  out:
@@ -961,10 +1037,10 @@ static int remove_from_waiters_ms(struct dlm_lkb *lkb, struct dlm_message *ms)
         struct dlm_ls *ls = lkb->lkb_resource->res_ls;
         int error;
 
-        if (ms != &ls->ls_stub_ms)
+        if (ms->m_flags != DLM_IFL_STUB_MS)
                 mutex_lock(&ls->ls_waiters_mutex);
         error = _remove_from_waiters(lkb, ms->m_type, ms);
-        if (ms != &ls->ls_stub_ms)
+        if (ms->m_flags != DLM_IFL_STUB_MS)
                 mutex_unlock(&ls->ls_waiters_mutex);
         return error;
 }
@@ -1157,6 +1233,16 @@ void dlm_adjust_timeouts(struct dlm_ls *ls)
         list_for_each_entry(lkb, &ls->ls_timeout, lkb_time_list)
                 lkb->lkb_timestamp = ktime_add_us(lkb->lkb_timestamp, adj_us);
         mutex_unlock(&ls->ls_timeout_mutex);
+
+        if (!dlm_config.ci_waitwarn_us)
+                return;
+
+        mutex_lock(&ls->ls_waiters_mutex);
+        list_for_each_entry(lkb, &ls->ls_waiters, lkb_wait_reply) {
+                if (ktime_to_us(lkb->lkb_wait_time))
+                        lkb->lkb_wait_time = ktime_get();
+        }
+        mutex_unlock(&ls->ls_waiters_mutex);
 }
 
 /* lkb is master or local copy */
@@ -1376,14 +1462,8 @@ static void grant_lock_pending(struct dlm_rsb *r, struct dlm_lkb *lkb)
    ALTPR/ALTCW: our rqmode may have been changed to PR or CW to become
    compatible with other granted locks */
 
-static void munge_demoted(struct dlm_lkb *lkb, struct dlm_message *ms)
+static void munge_demoted(struct dlm_lkb *lkb)
 {
-        if (ms->m_type != DLM_MSG_CONVERT_REPLY) {
-                log_print("munge_demoted %x invalid reply type %d",
-                          lkb->lkb_id, ms->m_type);
-                return;
-        }
-
         if (lkb->lkb_rqmode == DLM_LOCK_IV || lkb->lkb_grmode == DLM_LOCK_IV) {
                 log_print("munge_demoted %x invalid modes gr %d rq %d",
                           lkb->lkb_id, lkb->lkb_grmode, lkb->lkb_rqmode);
@@ -2844,12 +2924,12 @@ static int send_common(struct dlm_rsb *r, struct dlm_lkb *lkb, int mstype)
         struct dlm_mhandle *mh;
         int to_nodeid, error;
 
-        error = add_to_waiters(lkb, mstype);
+        to_nodeid = r->res_nodeid;
+
+        error = add_to_waiters(lkb, mstype, to_nodeid);
         if (error)
                 return error;
 
-        to_nodeid = r->res_nodeid;
-
         error = create_message(r, lkb, to_nodeid, mstype, &ms, &mh);
         if (error)
                 goto fail;
@@ -2880,9 +2960,9 @@ static int send_convert(struct dlm_rsb *r, struct dlm_lkb *lkb)
         /* down conversions go without a reply from the master */
         if (!error && down_conversion(lkb)) {
                 remove_from_waiters(lkb, DLM_MSG_CONVERT_REPLY);
+                r->res_ls->ls_stub_ms.m_flags = DLM_IFL_STUB_MS;
                 r->res_ls->ls_stub_ms.m_type = DLM_MSG_CONVERT_REPLY;
                 r->res_ls->ls_stub_ms.m_result = 0;
-                r->res_ls->ls_stub_ms.m_flags = lkb->lkb_flags;
                 __receive_convert_reply(r, lkb, &r->res_ls->ls_stub_ms);
         }
 
@@ -2951,12 +3031,12 @@ static int send_lookup(struct dlm_rsb *r, struct dlm_lkb *lkb)
         struct dlm_mhandle *mh;
         int to_nodeid, error;
 
-        error = add_to_waiters(lkb, DLM_MSG_LOOKUP);
+        to_nodeid = dlm_dir_nodeid(r);
+
+        error = add_to_waiters(lkb, DLM_MSG_LOOKUP, to_nodeid);
         if (error)
                 return error;
 
-        to_nodeid = dlm_dir_nodeid(r);
-
         error = create_message(r, NULL, to_nodeid, DLM_MSG_LOOKUP, &ms, &mh);
         if (error)
                 goto fail;
@@ -3070,6 +3150,9 @@ static void receive_flags(struct dlm_lkb *lkb, struct dlm_message *ms)
 
 static void receive_flags_reply(struct dlm_lkb *lkb, struct dlm_message *ms)
 {
+        if (ms->m_flags == DLM_IFL_STUB_MS)
+                return;
+
         lkb->lkb_sbflags = ms->m_sbflags;
         lkb->lkb_flags = (lkb->lkb_flags & 0xFFFF0000) |
                          (ms->m_flags & 0x0000FFFF);
@@ -3612,7 +3695,7 @@ static void __receive_convert_reply(struct dlm_rsb *r, struct dlm_lkb *lkb,
                 /* convert was queued on remote master */
                 receive_flags_reply(lkb, ms);
                 if (is_demoted(lkb))
-                        munge_demoted(lkb, ms);
+                        munge_demoted(lkb);
                 del_lkb(r, lkb);
                 add_lkb(r, lkb, DLM_LKSTS_CONVERT);
                 add_timeout(lkb);
@@ -3622,7 +3705,7 @@ static void __receive_convert_reply(struct dlm_rsb *r, struct dlm_lkb *lkb,
                 /* convert was granted on remote master */
                 receive_flags_reply(lkb, ms);
                 if (is_demoted(lkb))
-                        munge_demoted(lkb, ms);
+                        munge_demoted(lkb);
                 grant_lock_pc(r, lkb, ms);
                 queue_cast(r, lkb, 0);
                 break;
@@ -3996,15 +4079,17 @@ void dlm_receive_buffer(union dlm_packet *p, int nodeid)
         dlm_put_lockspace(ls);
 }
 
-static void recover_convert_waiter(struct dlm_ls *ls, struct dlm_lkb *lkb)
+static void recover_convert_waiter(struct dlm_ls *ls, struct dlm_lkb *lkb,
+                                   struct dlm_message *ms_stub)
 {
         if (middle_conversion(lkb)) {
                 hold_lkb(lkb);
-                ls->ls_stub_ms.m_type = DLM_MSG_CONVERT_REPLY;
-                ls->ls_stub_ms.m_result = -EINPROGRESS;
-                ls->ls_stub_ms.m_flags = lkb->lkb_flags;
-                ls->ls_stub_ms.m_header.h_nodeid = lkb->lkb_nodeid;
-                _receive_convert_reply(lkb, &ls->ls_stub_ms);
+                memset(ms_stub, 0, sizeof(struct dlm_message));
+                ms_stub->m_flags = DLM_IFL_STUB_MS;
+                ms_stub->m_type = DLM_MSG_CONVERT_REPLY;
+                ms_stub->m_result = -EINPROGRESS;
+                ms_stub->m_header.h_nodeid = lkb->lkb_nodeid;
+                _receive_convert_reply(lkb, ms_stub);
 
                 /* Same special case as in receive_rcom_lock_args() */
                 lkb->lkb_grmode = DLM_LOCK_IV;
@@ -4045,13 +4130,27 @@ static int waiter_needs_recovery(struct dlm_ls *ls, struct dlm_lkb *lkb)
 void dlm_recover_waiters_pre(struct dlm_ls *ls)
 {
         struct dlm_lkb *lkb, *safe;
+        struct dlm_message *ms_stub;
         int wait_type, stub_unlock_result, stub_cancel_result;
 
+        ms_stub = kmalloc(GFP_KERNEL, sizeof(struct dlm_message));
+        if (!ms_stub) {
+                log_error(ls, "dlm_recover_waiters_pre no mem");
+                return;
+        }
+
         mutex_lock(&ls->ls_waiters_mutex);
 
         list_for_each_entry_safe(lkb, safe, &ls->ls_waiters, lkb_wait_reply) {
-                log_debug(ls, "pre recover waiter lkid %x type %d flags %x",
-                          lkb->lkb_id, lkb->lkb_wait_type, lkb->lkb_flags);
+
+                /* exclude debug messages about unlocks because there can be so
+                   many and they aren't very interesting */
+
+                if (lkb->lkb_wait_type != DLM_MSG_UNLOCK) {
+                        log_debug(ls, "recover_waiter %x nodeid %d "
+                                  "msg %d to %d", lkb->lkb_id, lkb->lkb_nodeid,
+                                  lkb->lkb_wait_type, lkb->lkb_wait_nodeid);
+                }
 
                 /* all outstanding lookups, regardless of destination  will be
                    resent after recovery is done */
@@ -4097,26 +4196,28 @@ void dlm_recover_waiters_pre(struct dlm_ls *ls)
                         break;
 
                 case DLM_MSG_CONVERT:
-                        recover_convert_waiter(ls, lkb);
+                        recover_convert_waiter(ls, lkb, ms_stub);
                         break;
 
                 case DLM_MSG_UNLOCK:
                         hold_lkb(lkb);
-                        ls->ls_stub_ms.m_type = DLM_MSG_UNLOCK_REPLY;
-                        ls->ls_stub_ms.m_result = stub_unlock_result;
-                        ls->ls_stub_ms.m_flags = lkb->lkb_flags;
-                        ls->ls_stub_ms.m_header.h_nodeid = lkb->lkb_nodeid;
-                        _receive_unlock_reply(lkb, &ls->ls_stub_ms);
+                        memset(ms_stub, 0, sizeof(struct dlm_message));
+                        ms_stub->m_flags = DLM_IFL_STUB_MS;
+                        ms_stub->m_type = DLM_MSG_UNLOCK_REPLY;
+                        ms_stub->m_result = stub_unlock_result;
+                        ms_stub->m_header.h_nodeid = lkb->lkb_nodeid;
+                        _receive_unlock_reply(lkb, ms_stub);
                         dlm_put_lkb(lkb);
                         break;
 
                 case DLM_MSG_CANCEL:
                         hold_lkb(lkb);
-                        ls->ls_stub_ms.m_type = DLM_MSG_CANCEL_REPLY;
-                        ls->ls_stub_ms.m_result = stub_cancel_result;
-                        ls->ls_stub_ms.m_flags = lkb->lkb_flags;
-                        ls->ls_stub_ms.m_header.h_nodeid = lkb->lkb_nodeid;
-                        _receive_cancel_reply(lkb, &ls->ls_stub_ms);
+                        memset(ms_stub, 0, sizeof(struct dlm_message));
+                        ms_stub->m_flags = DLM_IFL_STUB_MS;
+                        ms_stub->m_type = DLM_MSG_CANCEL_REPLY;
+                        ms_stub->m_result = stub_cancel_result;
+                        ms_stub->m_header.h_nodeid = lkb->lkb_nodeid;
+                        _receive_cancel_reply(lkb, ms_stub);
                         dlm_put_lkb(lkb);
                         break;
 
@@ -4127,6 +4228,7 @@ void dlm_recover_waiters_pre(struct dlm_ls *ls)
                 schedule();
         }
         mutex_unlock(&ls->ls_waiters_mutex);
+        kfree(ms_stub);
 }
 
 static struct dlm_lkb *find_resend_waiter(struct dlm_ls *ls)
@@ -4191,8 +4293,8 @@ int dlm_recover_waiters_post(struct dlm_ls *ls)
                 ou = is_overlap_unlock(lkb);
                 err = 0;
 
-                log_debug(ls, "recover_waiters_post %x type %d flags %x %s",
-                          lkb->lkb_id, mstype, lkb->lkb_flags, r->res_name);
+                log_debug(ls, "recover_waiter %x nodeid %d msg %d r_nodeid %d",
+                          lkb->lkb_id, lkb->lkb_nodeid, mstype, r->res_nodeid);
 
                 /* At this point we assume that we won't get a reply to any
                    previous op or overlap op on this lock.  First, do a big
diff --git a/fs/dlm/lock.h b/fs/dlm/lock.h
index 88e93c80cc22..265017a7c3e7 100644
--- a/fs/dlm/lock.h
+++ b/fs/dlm/lock.h
@@ -24,6 +24,7 @@ int dlm_put_lkb(struct dlm_lkb *lkb);
 void dlm_scan_rsbs(struct dlm_ls *ls);
 int dlm_lock_recovery_try(struct dlm_ls *ls);
 void dlm_unlock_recovery(struct dlm_ls *ls);
+void dlm_scan_waiters(struct dlm_ls *ls);
 void dlm_scan_timeout(struct dlm_ls *ls);
 void dlm_adjust_timeouts(struct dlm_ls *ls);
 
diff --git a/fs/dlm/lockspace.c b/fs/dlm/lockspace.c
index f994a7dfda85..14cbf4099753 100644
--- a/fs/dlm/lockspace.c
+++ b/fs/dlm/lockspace.c
@@ -243,7 +243,6 @@ static struct dlm_ls *find_ls_to_scan(void)
 static int dlm_scand(void *data)
 {
         struct dlm_ls *ls;
-        int timeout_jiffies = dlm_config.ci_scan_secs * HZ;
 
         while (!kthread_should_stop()) {
                 ls = find_ls_to_scan();
@@ -252,13 +251,14 @@ static int dlm_scand(void *data)
                                 ls->ls_scan_time = jiffies;
                                 dlm_scan_rsbs(ls);
                                 dlm_scan_timeout(ls);
+                                dlm_scan_waiters(ls);
                                 dlm_unlock_recovery(ls);
                         } else {
                                 ls->ls_scan_time += HZ;
                         }
-                } else {
-                        schedule_timeout_interruptible(timeout_jiffies);
+                        continue;
                 }
+                schedule_timeout_interruptible(dlm_config.ci_scan_secs * HZ);
         }
         return 0;
 }
diff --git a/fs/dlm/plock.c b/fs/dlm/plock.c
index 30d8b85febbf..e2b878004364 100644
--- a/fs/dlm/plock.c
+++ b/fs/dlm/plock.c
@@ -71,6 +71,36 @@ static void send_op(struct plock_op *op)
         wake_up(&send_wq);
 }
 
+/* If a process was killed while waiting for the only plock on a file,
+   locks_remove_posix will not see any lock on the file so it won't
+   send an unlock-close to us to pass on to userspace to clean up the
+   abandoned waiter.  So, we have to insert the unlock-close when the
+   lock call is interrupted. */
+
+static void do_unlock_close(struct dlm_ls *ls, u64 number,
+                            struct file *file, struct file_lock *fl)
+{
+        struct plock_op *op;
+
+        op = kzalloc(sizeof(*op), GFP_NOFS);
+        if (!op)
+                return;
+
+        op->info.optype         = DLM_PLOCK_OP_UNLOCK;
+        op->info.pid            = fl->fl_pid;
+        op->info.fsid           = ls->ls_global_id;
+        op->info.number         = number;
+        op->info.start          = 0;
+        op->info.end            = OFFSET_MAX;
+        if (fl->fl_lmops && fl->fl_lmops->fl_grant)
+                op->info.owner  = (__u64) fl->fl_pid;
+        else
+                op->info.owner  = (__u64)(long) fl->fl_owner;
+
+        op->info.flags |= DLM_PLOCK_FL_CLOSE;
+        send_op(op);
+}
+
 int dlm_posix_lock(dlm_lockspace_t *lockspace, u64 number, struct file *file,
                    int cmd, struct file_lock *fl)
 {
@@ -114,9 +144,19 @@ int dlm_posix_lock(dlm_lockspace_t *lockspace, u64 number, struct file *file,
 
         send_op(op);
 
-        if (xop->callback == NULL)
-                wait_event(recv_wq, (op->done != 0));
-        else {
+        if (xop->callback == NULL) {
+                rv = wait_event_killable(recv_wq, (op->done != 0));
+                if (rv == -ERESTARTSYS) {
+                        log_debug(ls, "dlm_posix_lock: wait killed %llx",
+                                  (unsigned long long)number);
+                        spin_lock(&ops_lock);
+                        list_del(&op->list);
+                        spin_unlock(&ops_lock);
+                        kfree(xop);
+                        do_unlock_close(ls, number, file, fl);
+                        goto out;
+                }
+        } else {
                 rv = FILE_LOCK_DEFERRED;
                 goto out;
         }
@@ -233,6 +273,13 @@ int dlm_posix_unlock(dlm_lockspace_t *lockspace, u64 number, struct file *file,
         else
                 op->info.owner  = (__u64)(long) fl->fl_owner;
 
+        if (fl->fl_flags & FL_CLOSE) {
+                op->info.flags |= DLM_PLOCK_FL_CLOSE;
+                send_op(op);
+                rv = 0;
+                goto out;
+        }
+
         send_op(op);
         wait_event(recv_wq, (op->done != 0));
 
@@ -334,7 +381,10 @@ static ssize_t dev_read(struct file *file, char __user *u, size_t count,
         spin_lock(&ops_lock);
         if (!list_empty(&send_list)) {
                 op = list_entry(send_list.next, struct plock_op, list);
-                list_move(&op->list, &recv_list);
+                if (op->info.flags & DLM_PLOCK_FL_CLOSE)
+                        list_del(&op->list);
+                else
+                        list_move(&op->list, &recv_list);
                 memcpy(&info, &op->info, sizeof(info));
         }
         spin_unlock(&ops_lock);
@@ -342,6 +392,13 @@ static ssize_t dev_read(struct file *file, char __user *u, size_t count,
         if (!op)
                 return -EAGAIN;
 
+        /* there is no need to get a reply from userspace for unlocks
+           that were generated by the vfs cleaning up for a close
+           (the process did not make an unlock call). */
+
+        if (op->info.flags & DLM_PLOCK_FL_CLOSE)
+                kfree(op);
+
         if (copy_to_user(u, &info, sizeof(info)))
                 return -EFAULT;
         return sizeof(info);
diff --git a/fs/dlm/user.c b/fs/dlm/user.c
index d5ab3fe7c198..e96bf3e9be88 100644
--- a/fs/dlm/user.c
+++ b/fs/dlm/user.c
@@ -611,7 +611,6 @@ static ssize_t device_write(struct file *file, const char __user *buf,
 
  out_sig:
         sigprocmask(SIG_SETMASK, &tmpsig, NULL);
-        recalc_sigpending();
  out_free:
         kfree(kbuf);
         return error;
diff --git a/include/linux/dlm_plock.h b/include/linux/dlm_plock.h
index 2dd21243104f..3b1cc1be419f 100644
--- a/include/linux/dlm_plock.h
+++ b/include/linux/dlm_plock.h
@@ -14,7 +14,7 @@
 #define DLM_PLOCK_MISC_NAME             "dlm_plock"
 
 #define DLM_PLOCK_VERSION_MAJOR 1
-#define DLM_PLOCK_VERSION_MINOR 1
+#define DLM_PLOCK_VERSION_MINOR 2
 #define DLM_PLOCK_VERSION_PATCH 0
 
 enum {
@@ -23,12 +23,14 @@ enum {
         DLM_PLOCK_OP_GET,
 };
 
+#define DLM_PLOCK_FL_CLOSE 1
+
 struct dlm_plock_info {
         __u32 version[3];
         __u8 optype;
         __u8 ex;
         __u8 wait;
-        __u8 pad;
+        __u8 flags;
         __u32 pid;
         __s32 nodeid;
         __s32 rv;