[DLM] The core of the DLM for GFS2/CLVM
This is the core of the distributed lock manager which is required
to use GFS2 as a cluster filesystem. It is also used by CLVM and
can be used as a standalone lock manager independantly of either
of these two projects.
It implements VAX-style locking modes.
Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steve Whitehouse <swhiteho@redhat.com>
diff --git a/fs/Kconfig b/fs/Kconfig
index bec8afa..3a32f3f 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -1831,6 +1831,7 @@
endmenu
source "fs/nls/Kconfig"
+source "fs/dlm/Kconfig"
endmenu
diff --git a/fs/Makefile b/fs/Makefile
index 0922727..b298f4f 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -48,6 +48,7 @@
obj-y += devpts/
obj-$(CONFIG_PROFILING) += dcookies.o
+obj-$(CONFIG_DLM) += dlm/
# Do not add any filesystems before this line
obj-$(CONFIG_REISERFS_FS) += reiserfs/
diff --git a/fs/dlm/Kconfig b/fs/dlm/Kconfig
new file mode 100644
index 0000000..d01f735
--- /dev/null
+++ b/fs/dlm/Kconfig
@@ -0,0 +1,30 @@
+menu "Distributed Lock Manager"
+ depends on INET && EXPERIMENTAL
+
+config DLM
+ tristate "Distributed Lock Manager (DLM)"
+ depends on SYSFS
+ depends on IPV6 || IPV6=n
+ select IP_SCTP
+ select CONFIGFS_FS
+ help
+ A general purpose distributed lock manager for kernel or userspace
+ applications.
+
+config DLM_DEVICE
+ tristate "DLM device for userspace access"
+ depends on DLM
+ help
+ This module creates a misc device through which the dlm lockspace
+ and locking functions become available to userspace applications
+ (usually through the libdlm library).
+
+config DLM_DEBUG
+ bool "DLM debugging"
+ depends on DLM
+ help
+ Under the debugfs mount point, the name of each lockspace will
+ appear as a file in the "dlm" directory. The output is the
+ list of resource and locks the local node knows about.
+
+endmenu
diff --git a/fs/dlm/Makefile b/fs/dlm/Makefile
new file mode 100644
index 0000000..1e6232e
--- /dev/null
+++ b/fs/dlm/Makefile
@@ -0,0 +1,21 @@
+obj-$(CONFIG_DLM) += dlm.o
+obj-$(CONFIG_DLM_DEVICE) += dlm_device.o
+
+dlm-y := ast.o \
+ config.o \
+ dir.o \
+ lock.o \
+ lockspace.o \
+ lowcomms.o \
+ main.o \
+ member.o \
+ memory.o \
+ midcomms.o \
+ rcom.o \
+ recover.o \
+ recoverd.o \
+ requestqueue.o \
+ util.o
+dlm-$(CONFIG_DLM_DEBUG) += debug_fs.o
+
+dlm_device-y := device.o
diff --git a/fs/dlm/ast.c b/fs/dlm/ast.c
new file mode 100644
index 0000000..2bd1c5e
--- /dev/null
+++ b/fs/dlm/ast.c
@@ -0,0 +1,167 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#include "dlm_internal.h"
+#include "lock.h"
+#include "ast.h"
+
+#define WAKE_ASTS 0
+
+static struct list_head ast_queue;
+static spinlock_t ast_queue_lock;
+static struct task_struct * astd_task;
+static unsigned long astd_wakeflags;
+static struct semaphore astd_running;
+
+
+void dlm_del_ast(struct dlm_lkb *lkb)
+{
+ spin_lock(&ast_queue_lock);
+ if (lkb->lkb_ast_type & (AST_COMP | AST_BAST))
+ list_del(&lkb->lkb_astqueue);
+ spin_unlock(&ast_queue_lock);
+}
+
+void dlm_add_ast(struct dlm_lkb *lkb, int type)
+{
+ spin_lock(&ast_queue_lock);
+ if (!(lkb->lkb_ast_type & (AST_COMP | AST_BAST))) {
+ kref_get(&lkb->lkb_ref);
+ list_add_tail(&lkb->lkb_astqueue, &ast_queue);
+ }
+ lkb->lkb_ast_type |= type;
+ spin_unlock(&ast_queue_lock);
+
+ set_bit(WAKE_ASTS, &astd_wakeflags);
+ wake_up_process(astd_task);
+}
+
+static void process_asts(void)
+{
+ struct dlm_ls *ls = NULL;
+ struct dlm_rsb *r = NULL;
+ struct dlm_lkb *lkb;
+ void (*cast) (long param);
+ void (*bast) (long param, int mode);
+ int type = 0, found, bmode;
+
+ for (;;) {
+ found = FALSE;
+ spin_lock(&ast_queue_lock);
+ list_for_each_entry(lkb, &ast_queue, lkb_astqueue) {
+ r = lkb->lkb_resource;
+ ls = r->res_ls;
+
+ if (dlm_locking_stopped(ls))
+ continue;
+
+ list_del(&lkb->lkb_astqueue);
+ type = lkb->lkb_ast_type;
+ lkb->lkb_ast_type = 0;
+ found = TRUE;
+ break;
+ }
+ spin_unlock(&ast_queue_lock);
+
+ if (!found)
+ break;
+
+ cast = lkb->lkb_astaddr;
+ bast = lkb->lkb_bastaddr;
+ bmode = lkb->lkb_bastmode;
+
+ if ((type & AST_COMP) && cast)
+ cast(lkb->lkb_astparam);
+
+ /* FIXME: Is it safe to look at lkb_grmode here
+ without doing a lock_rsb() ?
+ Look at other checks in v1 to avoid basts. */
+
+ if ((type & AST_BAST) && bast)
+ if (!dlm_modes_compat(lkb->lkb_grmode, bmode))
+ bast(lkb->lkb_astparam, bmode);
+
+ /* this removes the reference added by dlm_add_ast
+ and may result in the lkb being freed */
+ dlm_put_lkb(lkb);
+
+ schedule();
+ }
+}
+
+static inline int no_asts(void)
+{
+ int ret;
+
+ spin_lock(&ast_queue_lock);
+ ret = list_empty(&ast_queue);
+ spin_unlock(&ast_queue_lock);
+ return ret;
+}
+
+static int dlm_astd(void *data)
+{
+ while (!kthread_should_stop()) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (!test_bit(WAKE_ASTS, &astd_wakeflags))
+ schedule();
+ set_current_state(TASK_RUNNING);
+
+ down(&astd_running);
+ if (test_and_clear_bit(WAKE_ASTS, &astd_wakeflags))
+ process_asts();
+ up(&astd_running);
+ }
+ return 0;
+}
+
+void dlm_astd_wake(void)
+{
+ if (!no_asts()) {
+ set_bit(WAKE_ASTS, &astd_wakeflags);
+ wake_up_process(astd_task);
+ }
+}
+
+int dlm_astd_start(void)
+{
+ struct task_struct *p;
+ int error = 0;
+
+ INIT_LIST_HEAD(&ast_queue);
+ spin_lock_init(&ast_queue_lock);
+ init_MUTEX(&astd_running);
+
+ p = kthread_run(dlm_astd, NULL, "dlm_astd");
+ if (IS_ERR(p))
+ error = PTR_ERR(p);
+ else
+ astd_task = p;
+ return error;
+}
+
+void dlm_astd_stop(void)
+{
+ kthread_stop(astd_task);
+}
+
+void dlm_astd_suspend(void)
+{
+ down(&astd_running);
+}
+
+void dlm_astd_resume(void)
+{
+ up(&astd_running);
+}
+
diff --git a/fs/dlm/ast.h b/fs/dlm/ast.h
new file mode 100644
index 0000000..6ee276c
--- /dev/null
+++ b/fs/dlm/ast.h
@@ -0,0 +1,26 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) 2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#ifndef __ASTD_DOT_H__
+#define __ASTD_DOT_H__
+
+void dlm_add_ast(struct dlm_lkb *lkb, int type);
+void dlm_del_ast(struct dlm_lkb *lkb);
+
+void dlm_astd_wake(void);
+int dlm_astd_start(void);
+void dlm_astd_stop(void);
+void dlm_astd_suspend(void);
+void dlm_astd_resume(void);
+
+#endif
+
diff --git a/fs/dlm/config.c b/fs/dlm/config.c
new file mode 100644
index 0000000..024ace9
--- /dev/null
+++ b/fs/dlm/config.c
@@ -0,0 +1,787 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/configfs.h>
+#include <net/sock.h>
+
+#include "config.h"
+
+/*
+ * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
+ * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
+ * /config/dlm/<cluster>/comms/<comm>/nodeid
+ * /config/dlm/<cluster>/comms/<comm>/local
+ * /config/dlm/<cluster>/comms/<comm>/addr
+ * The <cluster> level is useless, but I haven't figured out how to avoid it.
+ */
+
+static struct config_group *space_list;
+static struct config_group *comm_list;
+static struct comm *local_comm;
+
+struct clusters;
+struct cluster;
+struct spaces;
+struct space;
+struct comms;
+struct comm;
+struct nodes;
+struct node;
+
+static struct config_group *make_cluster(struct config_group *, const char *);
+static void drop_cluster(struct config_group *, struct config_item *);
+static void release_cluster(struct config_item *);
+static struct config_group *make_space(struct config_group *, const char *);
+static void drop_space(struct config_group *, struct config_item *);
+static void release_space(struct config_item *);
+static struct config_item *make_comm(struct config_group *, const char *);
+static void drop_comm(struct config_group *, struct config_item *);
+static void release_comm(struct config_item *);
+static struct config_item *make_node(struct config_group *, const char *);
+static void drop_node(struct config_group *, struct config_item *);
+static void release_node(struct config_item *);
+
+static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
+ char *buf);
+static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
+ const char *buf, size_t len);
+static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
+ char *buf);
+static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
+ const char *buf, size_t len);
+
+static ssize_t comm_nodeid_read(struct comm *cm, char *buf);
+static ssize_t comm_nodeid_write(struct comm *cm, const char *buf, size_t len);
+static ssize_t comm_local_read(struct comm *cm, char *buf);
+static ssize_t comm_local_write(struct comm *cm, const char *buf, size_t len);
+static ssize_t comm_addr_write(struct comm *cm, const char *buf, size_t len);
+static ssize_t node_nodeid_read(struct node *nd, char *buf);
+static ssize_t node_nodeid_write(struct node *nd, const char *buf, size_t len);
+static ssize_t node_weight_read(struct node *nd, char *buf);
+static ssize_t node_weight_write(struct node *nd, const char *buf, size_t len);
+
+enum {
+ COMM_ATTR_NODEID = 0,
+ COMM_ATTR_LOCAL,
+ COMM_ATTR_ADDR,
+};
+
+struct comm_attribute {
+ struct configfs_attribute attr;
+ ssize_t (*show)(struct comm *, char *);
+ ssize_t (*store)(struct comm *, const char *, size_t);
+};
+
+static struct comm_attribute comm_attr_nodeid = {
+ .attr = { .ca_owner = THIS_MODULE,
+ .ca_name = "nodeid",
+ .ca_mode = S_IRUGO | S_IWUSR },
+ .show = comm_nodeid_read,
+ .store = comm_nodeid_write,
+};
+
+static struct comm_attribute comm_attr_local = {
+ .attr = { .ca_owner = THIS_MODULE,
+ .ca_name = "local",
+ .ca_mode = S_IRUGO | S_IWUSR },
+ .show = comm_local_read,
+ .store = comm_local_write,
+};
+
+static struct comm_attribute comm_attr_addr = {
+ .attr = { .ca_owner = THIS_MODULE,
+ .ca_name = "addr",
+ .ca_mode = S_IRUGO | S_IWUSR },
+ .store = comm_addr_write,
+};
+
+static struct configfs_attribute *comm_attrs[] = {
+ [COMM_ATTR_NODEID] = &comm_attr_nodeid.attr,
+ [COMM_ATTR_LOCAL] = &comm_attr_local.attr,
+ [COMM_ATTR_ADDR] = &comm_attr_addr.attr,
+ NULL,
+};
+
+enum {
+ NODE_ATTR_NODEID = 0,
+ NODE_ATTR_WEIGHT,
+};
+
+struct node_attribute {
+ struct configfs_attribute attr;
+ ssize_t (*show)(struct node *, char *);
+ ssize_t (*store)(struct node *, const char *, size_t);
+};
+
+static struct node_attribute node_attr_nodeid = {
+ .attr = { .ca_owner = THIS_MODULE,
+ .ca_name = "nodeid",
+ .ca_mode = S_IRUGO | S_IWUSR },
+ .show = node_nodeid_read,
+ .store = node_nodeid_write,
+};
+
+static struct node_attribute node_attr_weight = {
+ .attr = { .ca_owner = THIS_MODULE,
+ .ca_name = "weight",
+ .ca_mode = S_IRUGO | S_IWUSR },
+ .show = node_weight_read,
+ .store = node_weight_write,
+};
+
+static struct configfs_attribute *node_attrs[] = {
+ [NODE_ATTR_NODEID] = &node_attr_nodeid.attr,
+ [NODE_ATTR_WEIGHT] = &node_attr_weight.attr,
+ NULL,
+};
+
+struct clusters {
+ struct configfs_subsystem subsys;
+};
+
+struct cluster {
+ struct config_group group;
+};
+
+struct spaces {
+ struct config_group ss_group;
+};
+
+struct space {
+ struct config_group group;
+ struct list_head members;
+ struct semaphore members_lock;
+ int members_count;
+};
+
+struct comms {
+ struct config_group cs_group;
+};
+
+struct comm {
+ struct config_item item;
+ int nodeid;
+ int local;
+ int addr_count;
+ struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
+};
+
+struct nodes {
+ struct config_group ns_group;
+};
+
+struct node {
+ struct config_item item;
+ struct list_head list; /* space->members */
+ int nodeid;
+ int weight;
+};
+
+static struct configfs_group_operations clusters_ops = {
+ .make_group = make_cluster,
+ .drop_item = drop_cluster,
+};
+
+static struct configfs_item_operations cluster_ops = {
+ .release = release_cluster,
+};
+
+static struct configfs_group_operations spaces_ops = {
+ .make_group = make_space,
+ .drop_item = drop_space,
+};
+
+static struct configfs_item_operations space_ops = {
+ .release = release_space,
+};
+
+static struct configfs_group_operations comms_ops = {
+ .make_item = make_comm,
+ .drop_item = drop_comm,
+};
+
+static struct configfs_item_operations comm_ops = {
+ .release = release_comm,
+ .show_attribute = show_comm,
+ .store_attribute = store_comm,
+};
+
+static struct configfs_group_operations nodes_ops = {
+ .make_item = make_node,
+ .drop_item = drop_node,
+};
+
+static struct configfs_item_operations node_ops = {
+ .release = release_node,
+ .show_attribute = show_node,
+ .store_attribute = store_node,
+};
+
+static struct config_item_type clusters_type = {
+ .ct_group_ops = &clusters_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct config_item_type cluster_type = {
+ .ct_item_ops = &cluster_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct config_item_type spaces_type = {
+ .ct_group_ops = &spaces_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct config_item_type space_type = {
+ .ct_item_ops = &space_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct config_item_type comms_type = {
+ .ct_group_ops = &comms_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct config_item_type comm_type = {
+ .ct_item_ops = &comm_ops,
+ .ct_attrs = comm_attrs,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct config_item_type nodes_type = {
+ .ct_group_ops = &nodes_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct config_item_type node_type = {
+ .ct_item_ops = &node_ops,
+ .ct_attrs = node_attrs,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct cluster *to_cluster(struct config_item *i)
+{
+ return i ? container_of(to_config_group(i), struct cluster, group):NULL;
+}
+
+static struct space *to_space(struct config_item *i)
+{
+ return i ? container_of(to_config_group(i), struct space, group) : NULL;
+}
+
+static struct comm *to_comm(struct config_item *i)
+{
+ return i ? container_of(i, struct comm, item) : NULL;
+}
+
+static struct node *to_node(struct config_item *i)
+{
+ return i ? container_of(i, struct node, item) : NULL;
+}
+
+static struct config_group *make_cluster(struct config_group *g,
+ const char *name)
+{
+ struct cluster *cl = NULL;
+ struct spaces *sps = NULL;
+ struct comms *cms = NULL;
+ void *gps = NULL;
+
+ cl = kzalloc(sizeof(struct cluster), GFP_KERNEL);
+ gps = kcalloc(3, sizeof(struct config_group *), GFP_KERNEL);
+ sps = kzalloc(sizeof(struct spaces), GFP_KERNEL);
+ cms = kzalloc(sizeof(struct comms), GFP_KERNEL);
+
+ if (!cl || !gps || !sps || !cms)
+ goto fail;
+
+ config_group_init_type_name(&cl->group, name, &cluster_type);
+ config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
+ config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
+
+ cl->group.default_groups = gps;
+ cl->group.default_groups[0] = &sps->ss_group;
+ cl->group.default_groups[1] = &cms->cs_group;
+ cl->group.default_groups[2] = NULL;
+
+ space_list = &sps->ss_group;
+ comm_list = &cms->cs_group;
+ return &cl->group;
+
+ fail:
+ kfree(cl);
+ kfree(gps);
+ kfree(sps);
+ kfree(cms);
+ return NULL;
+}
+
+static void drop_cluster(struct config_group *g, struct config_item *i)
+{
+ struct cluster *cl = to_cluster(i);
+ struct config_item *tmp;
+ int j;
+
+ for (j = 0; cl->group.default_groups[j]; j++) {
+ tmp = &cl->group.default_groups[j]->cg_item;
+ cl->group.default_groups[j] = NULL;
+ config_item_put(tmp);
+ }
+
+ space_list = NULL;
+ comm_list = NULL;
+
+ config_item_put(i);
+}
+
+static void release_cluster(struct config_item *i)
+{
+ struct cluster *cl = to_cluster(i);
+ kfree(cl->group.default_groups);
+ kfree(cl);
+}
+
+static struct config_group *make_space(struct config_group *g, const char *name)
+{
+ struct space *sp = NULL;
+ struct nodes *nds = NULL;
+ void *gps = NULL;
+
+ sp = kzalloc(sizeof(struct space), GFP_KERNEL);
+ gps = kcalloc(2, sizeof(struct config_group *), GFP_KERNEL);
+ nds = kzalloc(sizeof(struct nodes), GFP_KERNEL);
+
+ if (!sp || !gps || !nds)
+ goto fail;
+
+ config_group_init_type_name(&sp->group, name, &space_type);
+ config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
+
+ sp->group.default_groups = gps;
+ sp->group.default_groups[0] = &nds->ns_group;
+ sp->group.default_groups[1] = NULL;
+
+ INIT_LIST_HEAD(&sp->members);
+ init_MUTEX(&sp->members_lock);
+ sp->members_count = 0;
+ return &sp->group;
+
+ fail:
+ kfree(sp);
+ kfree(gps);
+ kfree(nds);
+ return NULL;
+}
+
+static void drop_space(struct config_group *g, struct config_item *i)
+{
+ struct space *sp = to_space(i);
+ struct config_item *tmp;
+ int j;
+
+ /* assert list_empty(&sp->members) */
+
+ for (j = 0; sp->group.default_groups[j]; j++) {
+ tmp = &sp->group.default_groups[j]->cg_item;
+ sp->group.default_groups[j] = NULL;
+ config_item_put(tmp);
+ }
+
+ config_item_put(i);
+}
+
+static void release_space(struct config_item *i)
+{
+ struct space *sp = to_space(i);
+ kfree(sp->group.default_groups);
+ kfree(sp);
+}
+
+static struct config_item *make_comm(struct config_group *g, const char *name)
+{
+ struct comm *cm;
+
+ cm = kzalloc(sizeof(struct comm), GFP_KERNEL);
+ if (!cm)
+ return NULL;
+
+ config_item_init_type_name(&cm->item, name, &comm_type);
+ cm->nodeid = -1;
+ cm->local = 0;
+ cm->addr_count = 0;
+ return &cm->item;
+}
+
+static void drop_comm(struct config_group *g, struct config_item *i)
+{
+ struct comm *cm = to_comm(i);
+ if (local_comm == cm)
+ local_comm = NULL;
+ while (cm->addr_count--)
+ kfree(cm->addr[cm->addr_count]);
+ config_item_put(i);
+}
+
+static void release_comm(struct config_item *i)
+{
+ struct comm *cm = to_comm(i);
+ kfree(cm);
+}
+
+static struct config_item *make_node(struct config_group *g, const char *name)
+{
+ struct space *sp = to_space(g->cg_item.ci_parent);
+ struct node *nd;
+
+ nd = kzalloc(sizeof(struct node), GFP_KERNEL);
+ if (!nd)
+ return NULL;
+
+ config_item_init_type_name(&nd->item, name, &node_type);
+ nd->nodeid = -1;
+ nd->weight = 1; /* default weight of 1 if none is set */
+
+ down(&sp->members_lock);
+ list_add(&nd->list, &sp->members);
+ sp->members_count++;
+ up(&sp->members_lock);
+
+ return &nd->item;
+}
+
+static void drop_node(struct config_group *g, struct config_item *i)
+{
+ struct space *sp = to_space(g->cg_item.ci_parent);
+ struct node *nd = to_node(i);
+
+ down(&sp->members_lock);
+ list_del(&nd->list);
+ sp->members_count--;
+ up(&sp->members_lock);
+
+ config_item_put(i);
+}
+
+static void release_node(struct config_item *i)
+{
+ struct node *nd = to_node(i);
+ kfree(nd);
+}
+
+static struct clusters clusters_root = {
+ .subsys = {
+ .su_group = {
+ .cg_item = {
+ .ci_namebuf = "dlm",
+ .ci_type = &clusters_type,
+ },
+ },
+ },
+};
+
+int dlm_config_init(void)
+{
+ config_group_init(&clusters_root.subsys.su_group);
+ init_MUTEX(&clusters_root.subsys.su_sem);
+ return configfs_register_subsystem(&clusters_root.subsys);
+}
+
+void dlm_config_exit(void)
+{
+ configfs_unregister_subsystem(&clusters_root.subsys);
+}
+
+/*
+ * Functions for user space to read/write attributes
+ */
+
+static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
+ char *buf)
+{
+ struct comm *cm = to_comm(i);
+ struct comm_attribute *cma =
+ container_of(a, struct comm_attribute, attr);
+ return cma->show ? cma->show(cm, buf) : 0;
+}
+
+static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
+ const char *buf, size_t len)
+{
+ struct comm *cm = to_comm(i);
+ struct comm_attribute *cma =
+ container_of(a, struct comm_attribute, attr);
+ return cma->store ? cma->store(cm, buf, len) : -EINVAL;
+}
+
+static ssize_t comm_nodeid_read(struct comm *cm, char *buf)
+{
+ return sprintf(buf, "%d\n", cm->nodeid);
+}
+
+static ssize_t comm_nodeid_write(struct comm *cm, const char *buf, size_t len)
+{
+ cm->nodeid = simple_strtol(buf, NULL, 0);
+ return len;
+}
+
+static ssize_t comm_local_read(struct comm *cm, char *buf)
+{
+ return sprintf(buf, "%d\n", cm->local);
+}
+
+static ssize_t comm_local_write(struct comm *cm, const char *buf, size_t len)
+{
+ cm->local= simple_strtol(buf, NULL, 0);
+ if (cm->local && !local_comm)
+ local_comm = cm;
+ return len;
+}
+
+static ssize_t comm_addr_write(struct comm *cm, const char *buf, size_t len)
+{
+ struct sockaddr_storage *addr;
+
+ if (len != sizeof(struct sockaddr_storage))
+ return -EINVAL;
+
+ if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
+ return -ENOSPC;
+
+ addr = kzalloc(sizeof(*addr), GFP_KERNEL);
+ if (!addr)
+ return -ENOMEM;
+
+ memcpy(addr, buf, len);
+ cm->addr[cm->addr_count++] = addr;
+ return len;
+}
+
+static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
+ char *buf)
+{
+ struct node *nd = to_node(i);
+ struct node_attribute *nda =
+ container_of(a, struct node_attribute, attr);
+ return nda->show ? nda->show(nd, buf) : 0;
+}
+
+static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
+ const char *buf, size_t len)
+{
+ struct node *nd = to_node(i);
+ struct node_attribute *nda =
+ container_of(a, struct node_attribute, attr);
+ return nda->store ? nda->store(nd, buf, len) : -EINVAL;
+}
+
+static ssize_t node_nodeid_read(struct node *nd, char *buf)
+{
+ return sprintf(buf, "%d\n", nd->nodeid);
+}
+
+static ssize_t node_nodeid_write(struct node *nd, const char *buf, size_t len)
+{
+ nd->nodeid = simple_strtol(buf, NULL, 0);
+ return len;
+}
+
+static ssize_t node_weight_read(struct node *nd, char *buf)
+{
+ return sprintf(buf, "%d\n", nd->weight);
+}
+
+static ssize_t node_weight_write(struct node *nd, const char *buf, size_t len)
+{
+ nd->weight = simple_strtol(buf, NULL, 0);
+ return len;
+}
+
+/*
+ * Functions for the dlm to get the info that's been configured
+ */
+
+static struct space *get_space(char *name)
+{
+ if (!space_list)
+ return NULL;
+ return to_space(config_group_find_obj(space_list, name));
+}
+
+static void put_space(struct space *sp)
+{
+ config_item_put(&sp->group.cg_item);
+}
+
+static struct comm *get_comm(int nodeid, struct sockaddr_storage *addr)
+{
+ struct config_item *i;
+ struct comm *cm = NULL;
+ int found = 0;
+
+ if (!comm_list)
+ return NULL;
+
+ down(&clusters_root.subsys.su_sem);
+
+ list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
+ cm = to_comm(i);
+
+ if (nodeid) {
+ if (cm->nodeid != nodeid)
+ continue;
+ found = 1;
+ break;
+ } else {
+ if (!cm->addr_count ||
+ memcmp(cm->addr[0], addr, sizeof(*addr)))
+ continue;
+ found = 1;
+ break;
+ }
+ }
+ up(&clusters_root.subsys.su_sem);
+
+ if (found)
+ config_item_get(i);
+ else
+ cm = NULL;
+ return cm;
+}
+
+static void put_comm(struct comm *cm)
+{
+ config_item_put(&cm->item);
+}
+
+/* caller must free mem */
+int dlm_nodeid_list(char *lsname, int **ids_out)
+{
+ struct space *sp;
+ struct node *nd;
+ int i = 0, rv = 0;
+ int *ids;
+
+ sp = get_space(lsname);
+ if (!sp)
+ return -EEXIST;
+
+ down(&sp->members_lock);
+ if (!sp->members_count) {
+ rv = 0;
+ goto out;
+ }
+
+ ids = kcalloc(sp->members_count, sizeof(int), GFP_KERNEL);
+ if (!ids) {
+ rv = -ENOMEM;
+ goto out;
+ }
+
+ rv = sp->members_count;
+ list_for_each_entry(nd, &sp->members, list)
+ ids[i++] = nd->nodeid;
+
+ if (rv != i)
+ printk("bad nodeid count %d %d\n", rv, i);
+
+ *ids_out = ids;
+ out:
+ up(&sp->members_lock);
+ put_space(sp);
+ return rv;
+}
+
+int dlm_node_weight(char *lsname, int nodeid)
+{
+ struct space *sp;
+ struct node *nd;
+ int w = -EEXIST;
+
+ sp = get_space(lsname);
+ if (!sp)
+ goto out;
+
+ down(&sp->members_lock);
+ list_for_each_entry(nd, &sp->members, list) {
+ if (nd->nodeid != nodeid)
+ continue;
+ w = nd->weight;
+ break;
+ }
+ up(&sp->members_lock);
+ put_space(sp);
+ out:
+ return w;
+}
+
+int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr)
+{
+ struct comm *cm = get_comm(nodeid, NULL);
+ if (!cm)
+ return -EEXIST;
+ if (!cm->addr_count)
+ return -ENOENT;
+ memcpy(addr, cm->addr[0], sizeof(*addr));
+ put_comm(cm);
+ return 0;
+}
+
+int dlm_addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid)
+{
+ struct comm *cm = get_comm(0, addr);
+ if (!cm)
+ return -EEXIST;
+ *nodeid = cm->nodeid;
+ put_comm(cm);
+ return 0;
+}
+
+int dlm_our_nodeid(void)
+{
+ return local_comm ? local_comm->nodeid : 0;
+}
+
+/* num 0 is first addr, num 1 is second addr */
+int dlm_our_addr(struct sockaddr_storage *addr, int num)
+{
+ if (!local_comm)
+ return -1;
+ if (num + 1 > local_comm->addr_count)
+ return -1;
+ memcpy(addr, local_comm->addr[num], sizeof(*addr));
+ return 0;
+}
+
+/* Config file defaults */
+#define DEFAULT_TCP_PORT 21064
+#define DEFAULT_BUFFER_SIZE 4096
+#define DEFAULT_RSBTBL_SIZE 256
+#define DEFAULT_LKBTBL_SIZE 1024
+#define DEFAULT_DIRTBL_SIZE 512
+#define DEFAULT_RECOVER_TIMER 5
+#define DEFAULT_TOSS_SECS 10
+#define DEFAULT_SCAN_SECS 5
+
+struct dlm_config_info dlm_config = {
+ .tcp_port = DEFAULT_TCP_PORT,
+ .buffer_size = DEFAULT_BUFFER_SIZE,
+ .rsbtbl_size = DEFAULT_RSBTBL_SIZE,
+ .lkbtbl_size = DEFAULT_LKBTBL_SIZE,
+ .dirtbl_size = DEFAULT_DIRTBL_SIZE,
+ .recover_timer = DEFAULT_RECOVER_TIMER,
+ .toss_secs = DEFAULT_TOSS_SECS,
+ .scan_secs = DEFAULT_SCAN_SECS
+};
+
diff --git a/fs/dlm/config.h b/fs/dlm/config.h
new file mode 100644
index 0000000..9da7839
--- /dev/null
+++ b/fs/dlm/config.h
@@ -0,0 +1,42 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#ifndef __CONFIG_DOT_H__
+#define __CONFIG_DOT_H__
+
+#define DLM_MAX_ADDR_COUNT 3
+
+struct dlm_config_info {
+ int tcp_port;
+ int buffer_size;
+ int rsbtbl_size;
+ int lkbtbl_size;
+ int dirtbl_size;
+ int recover_timer;
+ int toss_secs;
+ int scan_secs;
+};
+
+extern struct dlm_config_info dlm_config;
+
+int dlm_config_init(void);
+void dlm_config_exit(void);
+int dlm_node_weight(char *lsname, int nodeid);
+int dlm_nodeid_list(char *lsname, int **ids_out);
+int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr);
+int dlm_addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid);
+int dlm_our_nodeid(void);
+int dlm_our_addr(struct sockaddr_storage *addr, int num);
+
+#endif /* __CONFIG_DOT_H__ */
+
diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c
new file mode 100644
index 0000000..98b49a1
--- /dev/null
+++ b/fs/dlm/debug_fs.c
@@ -0,0 +1,310 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) 2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#include <linux/pagemap.h>
+#include <linux/seq_file.h>
+#include <linux/module.h>
+#include <linux/ctype.h>
+#include <linux/debugfs.h>
+
+#include "dlm_internal.h"
+
+
+static struct dentry *dlm_root;
+
+struct rsb_iter {
+ int entry;
+ struct dlm_ls *ls;
+ struct list_head *next;
+ struct dlm_rsb *rsb;
+};
+
+static char *print_lockmode(int mode)
+{
+ switch (mode) {
+ case DLM_LOCK_IV:
+ return "--";
+ case DLM_LOCK_NL:
+ return "NL";
+ case DLM_LOCK_CR:
+ return "CR";
+ case DLM_LOCK_CW:
+ return "CW";
+ case DLM_LOCK_PR:
+ return "PR";
+ case DLM_LOCK_PW:
+ return "PW";
+ case DLM_LOCK_EX:
+ return "EX";
+ default:
+ return "??";
+ }
+}
+
+static void print_lock(struct seq_file *s, struct dlm_lkb *lkb,
+ struct dlm_rsb *res)
+{
+ seq_printf(s, "%08x %s", lkb->lkb_id, print_lockmode(lkb->lkb_grmode));
+
+ if (lkb->lkb_status == DLM_LKSTS_CONVERT
+ || lkb->lkb_status == DLM_LKSTS_WAITING)
+ seq_printf(s, " (%s)", print_lockmode(lkb->lkb_rqmode));
+
+ if (lkb->lkb_range) {
+ /* FIXME: this warns on Alpha */
+ if (lkb->lkb_status == DLM_LKSTS_CONVERT
+ || lkb->lkb_status == DLM_LKSTS_GRANTED)
+ seq_printf(s, " %" PRIx64 "-%" PRIx64,
+ lkb->lkb_range[GR_RANGE_START],
+ lkb->lkb_range[GR_RANGE_END]);
+ if (lkb->lkb_status == DLM_LKSTS_CONVERT
+ || lkb->lkb_status == DLM_LKSTS_WAITING)
+ seq_printf(s, " (%" PRIx64 "-%" PRIx64 ")",
+ lkb->lkb_range[RQ_RANGE_START],
+ lkb->lkb_range[RQ_RANGE_END]);
+ }
+
+ if (lkb->lkb_nodeid) {
+ if (lkb->lkb_nodeid != res->res_nodeid)
+ seq_printf(s, " Remote: %3d %08x", lkb->lkb_nodeid,
+ lkb->lkb_remid);
+ else
+ seq_printf(s, " Master: %08x", lkb->lkb_remid);
+ }
+
+ if (lkb->lkb_wait_type)
+ seq_printf(s, " wait_type: %d", lkb->lkb_wait_type);
+
+ seq_printf(s, "\n");
+}
+
+static int print_resource(struct dlm_rsb *res, struct seq_file *s)
+{
+ struct dlm_lkb *lkb;
+ int i, lvblen = res->res_ls->ls_lvblen;
+
+ seq_printf(s, "\nResource %p Name (len=%d) \"", res, res->res_length);
+ for (i = 0; i < res->res_length; i++) {
+ if (isprint(res->res_name[i]))
+ seq_printf(s, "%c", res->res_name[i]);
+ else
+ seq_printf(s, "%c", '.');
+ }
+ if (res->res_nodeid > 0)
+ seq_printf(s, "\" \nLocal Copy, Master is node %d\n",
+ res->res_nodeid);
+ else if (res->res_nodeid == 0)
+ seq_printf(s, "\" \nMaster Copy\n");
+ else if (res->res_nodeid == -1)
+ seq_printf(s, "\" \nLooking up master (lkid %x)\n",
+ res->res_first_lkid);
+ else
+ seq_printf(s, "\" \nInvalid master %d\n", res->res_nodeid);
+
+ /* Print the LVB: */
+ if (res->res_lvbptr) {
+ seq_printf(s, "LVB: ");
+ for (i = 0; i < lvblen; i++) {
+ if (i == lvblen / 2)
+ seq_printf(s, "\n ");
+ seq_printf(s, "%02x ",
+ (unsigned char) res->res_lvbptr[i]);
+ }
+ if (rsb_flag(res, RSB_VALNOTVALID))
+ seq_printf(s, " (INVALID)");
+ seq_printf(s, "\n");
+ }
+
+ /* Print the locks attached to this resource */
+ seq_printf(s, "Granted Queue\n");
+ list_for_each_entry(lkb, &res->res_grantqueue, lkb_statequeue)
+ print_lock(s, lkb, res);
+
+ seq_printf(s, "Conversion Queue\n");
+ list_for_each_entry(lkb, &res->res_convertqueue, lkb_statequeue)
+ print_lock(s, lkb, res);
+
+ seq_printf(s, "Waiting Queue\n");
+ list_for_each_entry(lkb, &res->res_waitqueue, lkb_statequeue)
+ print_lock(s, lkb, res);
+
+ return 0;
+}
+
+static int rsb_iter_next(struct rsb_iter *ri)
+{
+ struct dlm_ls *ls = ri->ls;
+ int i;
+
+ if (!ri->next) {
+ top:
+ /* Find the next non-empty hash bucket */
+ for (i = ri->entry; i < ls->ls_rsbtbl_size; i++) {
+ read_lock(&ls->ls_rsbtbl[i].lock);
+ if (!list_empty(&ls->ls_rsbtbl[i].list)) {
+ ri->next = ls->ls_rsbtbl[i].list.next;
+ read_unlock(&ls->ls_rsbtbl[i].lock);
+ break;
+ }
+ read_unlock(&ls->ls_rsbtbl[i].lock);
+ }
+ ri->entry = i;
+
+ if (ri->entry >= ls->ls_rsbtbl_size)
+ return 1;
+ } else {
+ i = ri->entry;
+ read_lock(&ls->ls_rsbtbl[i].lock);
+ ri->next = ri->next->next;
+ if (ri->next->next == ls->ls_rsbtbl[i].list.next) {
+ /* End of list - move to next bucket */
+ ri->next = NULL;
+ ri->entry++;
+ read_unlock(&ls->ls_rsbtbl[i].lock);
+ goto top;
+ }
+ read_unlock(&ls->ls_rsbtbl[i].lock);
+ }
+ ri->rsb = list_entry(ri->next, struct dlm_rsb, res_hashchain);
+
+ return 0;
+}
+
+static void rsb_iter_free(struct rsb_iter *ri)
+{
+ kfree(ri);
+}
+
+static struct rsb_iter *rsb_iter_init(struct dlm_ls *ls)
+{
+ struct rsb_iter *ri;
+
+ ri = kmalloc(sizeof *ri, GFP_KERNEL);
+ if (!ri)
+ return NULL;
+
+ ri->ls = ls;
+ ri->entry = 0;
+ ri->next = NULL;
+
+ if (rsb_iter_next(ri)) {
+ rsb_iter_free(ri);
+ return NULL;
+ }
+
+ return ri;
+}
+
+static void *seq_start(struct seq_file *file, loff_t *pos)
+{
+ struct rsb_iter *ri;
+ loff_t n = *pos;
+
+ ri = rsb_iter_init(file->private);
+ if (!ri)
+ return NULL;
+
+ while (n--) {
+ if (rsb_iter_next(ri)) {
+ rsb_iter_free(ri);
+ return NULL;
+ }
+ }
+
+ return ri;
+}
+
+static void *seq_next(struct seq_file *file, void *iter_ptr, loff_t *pos)
+{
+ struct rsb_iter *ri = iter_ptr;
+
+ (*pos)++;
+
+ if (rsb_iter_next(ri)) {
+ rsb_iter_free(ri);
+ return NULL;
+ }
+
+ return ri;
+}
+
+static void seq_stop(struct seq_file *file, void *iter_ptr)
+{
+ /* nothing for now */
+}
+
+static int seq_show(struct seq_file *file, void *iter_ptr)
+{
+ struct rsb_iter *ri = iter_ptr;
+
+ print_resource(ri->rsb, file);
+
+ return 0;
+}
+
+static struct seq_operations dlm_seq_ops = {
+ .start = seq_start,
+ .next = seq_next,
+ .stop = seq_stop,
+ .show = seq_show,
+};
+
+static int do_open(struct inode *inode, struct file *file)
+{
+ struct seq_file *seq;
+ int ret;
+
+ ret = seq_open(file, &dlm_seq_ops);
+ if (ret)
+ return ret;
+
+ seq = file->private_data;
+ seq->private = inode->u.generic_ip;
+
+ return 0;
+}
+
+static struct file_operations dlm_fops = {
+ .owner = THIS_MODULE,
+ .open = do_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release
+};
+
+int dlm_create_debug_file(struct dlm_ls *ls)
+{
+ ls->ls_debug_dentry = debugfs_create_file(ls->ls_name,
+ S_IFREG | S_IRUGO,
+ dlm_root,
+ ls,
+ &dlm_fops);
+ return ls->ls_debug_dentry ? 0 : -ENOMEM;
+}
+
+void dlm_delete_debug_file(struct dlm_ls *ls)
+{
+ if (ls->ls_debug_dentry)
+ debugfs_remove(ls->ls_debug_dentry);
+}
+
+int dlm_register_debugfs(void)
+{
+ dlm_root = debugfs_create_dir("dlm", NULL);
+ return dlm_root ? 0 : -ENOMEM;
+}
+
+void dlm_unregister_debugfs(void)
+{
+ debugfs_remove(dlm_root);
+}
+
diff --git a/fs/dlm/device.c b/fs/dlm/device.c
new file mode 100644
index 0000000..a8bf600
--- /dev/null
+++ b/fs/dlm/device.c
@@ -0,0 +1,1084 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+/*
+ * device.c
+ *
+ * This is the userland interface to the DLM.
+ *
+ * The locking is done via a misc char device (find the
+ * registered minor number in /proc/misc).
+ *
+ * User code should not use this interface directly but
+ * call the library routines in libdlm.a instead.
+ *
+ */
+
+#include <linux/miscdevice.h>
+#include <linux/init.h>
+#include <linux/wait.h>
+#include <linux/module.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/poll.h>
+#include <linux/signal.h>
+#include <linux/spinlock.h>
+#include <linux/idr.h>
+
+#include <linux/dlm.h>
+#include <linux/dlm_device.h>
+
+#include "lvb_table.h"
+
+static struct file_operations _dlm_fops;
+static const char *name_prefix="dlm";
+static struct list_head user_ls_list;
+static struct semaphore user_ls_lock;
+
+/* Lock infos are stored in here indexed by lock ID */
+static DEFINE_IDR(lockinfo_idr);
+static rwlock_t lockinfo_lock;
+
+/* Flags in li_flags */
+#define LI_FLAG_COMPLETE 1
+#define LI_FLAG_FIRSTLOCK 2
+#define LI_FLAG_PERSISTENT 3
+
+/* flags in ls_flags*/
+#define LS_FLAG_DELETED 1
+#define LS_FLAG_AUTOFREE 2
+
+
+#define LOCKINFO_MAGIC 0x53595324
+
+struct lock_info {
+ uint32_t li_magic;
+ uint8_t li_cmd;
+ int8_t li_grmode;
+ int8_t li_rqmode;
+ struct dlm_lksb li_lksb;
+ wait_queue_head_t li_waitq;
+ unsigned long li_flags;
+ void __user *li_castparam;
+ void __user *li_castaddr;
+ void __user *li_bastparam;
+ void __user *li_bastaddr;
+ void __user *li_pend_bastparam;
+ void __user *li_pend_bastaddr;
+ struct list_head li_ownerqueue;
+ struct file_info *li_file;
+ struct dlm_lksb __user *li_user_lksb;
+ struct semaphore li_firstlock;
+};
+
+/* A queued AST no less */
+struct ast_info {
+ struct dlm_lock_result result;
+ struct list_head list;
+ uint32_t lvb_updated;
+ uint32_t progress; /* How much has been read */
+};
+
+/* One of these per userland lockspace */
+struct user_ls {
+ void *ls_lockspace;
+ atomic_t ls_refcnt;
+ long ls_flags;
+
+ /* Passed into misc_register() */
+ struct miscdevice ls_miscinfo;
+ struct list_head ls_list;
+};
+
+/* misc_device info for the control device */
+static struct miscdevice ctl_device;
+
+/*
+ * Stuff we hang off the file struct.
+ * The first two are to cope with unlocking all the
+ * locks help by a process when it dies.
+ */
+struct file_info {
+ struct list_head fi_li_list; /* List of active lock_infos */
+ spinlock_t fi_li_lock;
+ struct list_head fi_ast_list; /* Queue of ASTs to be delivered */
+ spinlock_t fi_ast_lock;
+ wait_queue_head_t fi_wait;
+ struct user_ls *fi_ls;
+ atomic_t fi_refcnt; /* Number of users */
+ unsigned long fi_flags; /* Bit 1 means the device is open */
+};
+
+
+/* get and put ops for file_info.
+ Actually I don't really like "get" and "put", but everyone
+ else seems to use them and I can't think of anything
+ nicer at the moment */
+static void get_file_info(struct file_info *f)
+{
+ atomic_inc(&f->fi_refcnt);
+}
+
+static void put_file_info(struct file_info *f)
+{
+ if (atomic_dec_and_test(&f->fi_refcnt))
+ kfree(f);
+}
+
+static void release_lockinfo(struct lock_info *li)
+{
+ put_file_info(li->li_file);
+
+ write_lock(&lockinfo_lock);
+ idr_remove(&lockinfo_idr, li->li_lksb.sb_lkid);
+ write_unlock(&lockinfo_lock);
+
+ if (li->li_lksb.sb_lvbptr)
+ kfree(li->li_lksb.sb_lvbptr);
+ kfree(li);
+
+ module_put(THIS_MODULE);
+}
+
+static struct lock_info *get_lockinfo(uint32_t lockid)
+{
+ struct lock_info *li;
+
+ read_lock(&lockinfo_lock);
+ li = idr_find(&lockinfo_idr, lockid);
+ read_unlock(&lockinfo_lock);
+
+ return li;
+}
+
+static int add_lockinfo(struct lock_info *li)
+{
+ int n;
+ int r;
+ int ret = -EINVAL;
+
+ write_lock(&lockinfo_lock);
+
+ if (idr_find(&lockinfo_idr, li->li_lksb.sb_lkid))
+ goto out_up;
+
+ ret = -ENOMEM;
+ r = idr_pre_get(&lockinfo_idr, GFP_KERNEL);
+ if (!r)
+ goto out_up;
+
+ r = idr_get_new_above(&lockinfo_idr, li, li->li_lksb.sb_lkid, &n);
+ if (r)
+ goto out_up;
+
+ if (n != li->li_lksb.sb_lkid) {
+ idr_remove(&lockinfo_idr, n);
+ goto out_up;
+ }
+
+ ret = 0;
+
+ out_up:
+ write_unlock(&lockinfo_lock);
+
+ return ret;
+}
+
+
+static struct user_ls *__find_lockspace(int minor)
+{
+ struct user_ls *lsinfo;
+
+ list_for_each_entry(lsinfo, &user_ls_list, ls_list) {
+ if (lsinfo->ls_miscinfo.minor == minor)
+ return lsinfo;
+ }
+ return NULL;
+}
+
+/* Find a lockspace struct given the device minor number */
+static struct user_ls *find_lockspace(int minor)
+{
+ struct user_ls *lsinfo;
+
+ down(&user_ls_lock);
+ lsinfo = __find_lockspace(minor);
+ up(&user_ls_lock);
+
+ return lsinfo;
+}
+
+static void add_lockspace_to_list(struct user_ls *lsinfo)
+{
+ down(&user_ls_lock);
+ list_add(&lsinfo->ls_list, &user_ls_list);
+ up(&user_ls_lock);
+}
+
+/* Register a lockspace with the DLM and create a misc
+ device for userland to access it */
+static int register_lockspace(char *name, struct user_ls **ls, int flags)
+{
+ struct user_ls *newls;
+ int status;
+ int namelen;
+
+ namelen = strlen(name)+strlen(name_prefix)+2;
+
+ newls = kmalloc(sizeof(struct user_ls), GFP_KERNEL);
+ if (!newls)
+ return -ENOMEM;
+ memset(newls, 0, sizeof(struct user_ls));
+
+ newls->ls_miscinfo.name = kmalloc(namelen, GFP_KERNEL);
+ if (!newls->ls_miscinfo.name) {
+ kfree(newls);
+ return -ENOMEM;
+ }
+
+ status = dlm_new_lockspace(name, strlen(name), &newls->ls_lockspace, 0,
+ DLM_USER_LVB_LEN);
+ if (status != 0) {
+ kfree(newls->ls_miscinfo.name);
+ kfree(newls);
+ return status;
+ }
+
+ snprintf((char*)newls->ls_miscinfo.name, namelen, "%s_%s",
+ name_prefix, name);
+
+ newls->ls_miscinfo.fops = &_dlm_fops;
+ newls->ls_miscinfo.minor = MISC_DYNAMIC_MINOR;
+
+ status = misc_register(&newls->ls_miscinfo);
+ if (status) {
+ printk(KERN_ERR "dlm: misc register failed for %s\n", name);
+ dlm_release_lockspace(newls->ls_lockspace, 0);
+ kfree(newls->ls_miscinfo.name);
+ kfree(newls);
+ return status;
+ }
+
+ if (flags & DLM_USER_LSFLG_AUTOFREE)
+ set_bit(LS_FLAG_AUTOFREE, &newls->ls_flags);
+
+ add_lockspace_to_list(newls);
+ *ls = newls;
+ return 0;
+}
+
+/* Called with the user_ls_lock semaphore held */
+static int unregister_lockspace(struct user_ls *lsinfo, int force)
+{
+ int status;
+
+ status = dlm_release_lockspace(lsinfo->ls_lockspace, force);
+ if (status)
+ return status;
+
+ status = misc_deregister(&lsinfo->ls_miscinfo);
+ if (status)
+ return status;
+
+ list_del(&lsinfo->ls_list);
+ set_bit(LS_FLAG_DELETED, &lsinfo->ls_flags);
+ lsinfo->ls_lockspace = NULL;
+ if (atomic_read(&lsinfo->ls_refcnt) == 0) {
+ kfree(lsinfo->ls_miscinfo.name);
+ kfree(lsinfo);
+ }
+
+ return 0;
+}
+
+/* Add it to userland's AST queue */
+static void add_to_astqueue(struct lock_info *li, void *astaddr, void *astparam,
+ int lvb_updated)
+{
+ struct ast_info *ast = kmalloc(sizeof(struct ast_info), GFP_KERNEL);
+ if (!ast)
+ return;
+
+ memset(ast, 0, sizeof(*ast));
+ ast->result.user_astparam = astparam;
+ ast->result.user_astaddr = astaddr;
+ ast->result.user_lksb = li->li_user_lksb;
+ memcpy(&ast->result.lksb, &li->li_lksb, sizeof(struct dlm_lksb));
+ ast->lvb_updated = lvb_updated;
+
+ spin_lock(&li->li_file->fi_ast_lock);
+ list_add_tail(&ast->list, &li->li_file->fi_ast_list);
+ spin_unlock(&li->li_file->fi_ast_lock);
+ wake_up_interruptible(&li->li_file->fi_wait);
+}
+
+static void bast_routine(void *param, int mode)
+{
+ struct lock_info *li = param;
+
+ if (li && li->li_bastaddr)
+ add_to_astqueue(li, li->li_bastaddr, li->li_bastparam, 0);
+}
+
+/*
+ * This is the kernel's AST routine.
+ * All lock, unlock & query operations complete here.
+ * The only syncronous ops are those done during device close.
+ */
+static void ast_routine(void *param)
+{
+ struct lock_info *li = param;
+
+ /* Param may be NULL if a persistent lock is unlocked by someone else */
+ if (!li)
+ return;
+
+ /* If this is a succesful conversion then activate the blocking ast
+ * args from the conversion request */
+ if (!test_bit(LI_FLAG_FIRSTLOCK, &li->li_flags) &&
+ li->li_lksb.sb_status == 0) {
+
+ li->li_bastparam = li->li_pend_bastparam;
+ li->li_bastaddr = li->li_pend_bastaddr;
+ li->li_pend_bastaddr = NULL;
+ }
+
+ /* If it's an async request then post data to the user's AST queue. */
+ if (li->li_castaddr) {
+ int lvb_updated = 0;
+
+ /* See if the lvb has been updated */
+ if (dlm_lvb_operations[li->li_grmode+1][li->li_rqmode+1] == 1)
+ lvb_updated = 1;
+
+ if (li->li_lksb.sb_status == 0)
+ li->li_grmode = li->li_rqmode;
+
+ /* Only queue AST if the device is still open */
+ if (test_bit(1, &li->li_file->fi_flags))
+ add_to_astqueue(li, li->li_castaddr, li->li_castparam,
+ lvb_updated);
+
+ /* If it's a new lock operation that failed, then
+ * remove it from the owner queue and free the
+ * lock_info.
+ */
+ if (test_and_clear_bit(LI_FLAG_FIRSTLOCK, &li->li_flags) &&
+ li->li_lksb.sb_status != 0) {
+
+ /* Wait till dlm_lock() has finished */
+ down(&li->li_firstlock);
+ up(&li->li_firstlock);
+
+ spin_lock(&li->li_file->fi_li_lock);
+ list_del(&li->li_ownerqueue);
+ spin_unlock(&li->li_file->fi_li_lock);
+ release_lockinfo(li);
+ return;
+ }
+ /* Free unlocks & queries */
+ if (li->li_lksb.sb_status == -DLM_EUNLOCK ||
+ li->li_cmd == DLM_USER_QUERY) {
+ release_lockinfo(li);
+ }
+ } else {
+ /* Synchronous request, just wake up the caller */
+ set_bit(LI_FLAG_COMPLETE, &li->li_flags);
+ wake_up_interruptible(&li->li_waitq);
+ }
+}
+
+/*
+ * Wait for the lock op to complete and return the status.
+ */
+static int wait_for_ast(struct lock_info *li)
+{
+ /* Wait for the AST routine to complete */
+ set_task_state(current, TASK_INTERRUPTIBLE);
+ while (!test_bit(LI_FLAG_COMPLETE, &li->li_flags))
+ schedule();
+
+ set_task_state(current, TASK_RUNNING);
+
+ return li->li_lksb.sb_status;
+}
+
+
+/* Open on control device */
+static int dlm_ctl_open(struct inode *inode, struct file *file)
+{
+ file->private_data = NULL;
+ return 0;
+}
+
+/* Close on control device */
+static int dlm_ctl_close(struct inode *inode, struct file *file)
+{
+ return 0;
+}
+
+/* Open on lockspace device */
+static int dlm_open(struct inode *inode, struct file *file)
+{
+ struct file_info *f;
+ struct user_ls *lsinfo;
+
+ lsinfo = find_lockspace(iminor(inode));
+ if (!lsinfo)
+ return -ENOENT;
+
+ f = kmalloc(sizeof(struct file_info), GFP_KERNEL);
+ if (!f)
+ return -ENOMEM;
+
+ atomic_inc(&lsinfo->ls_refcnt);
+ INIT_LIST_HEAD(&f->fi_li_list);
+ INIT_LIST_HEAD(&f->fi_ast_list);
+ spin_lock_init(&f->fi_li_lock);
+ spin_lock_init(&f->fi_ast_lock);
+ init_waitqueue_head(&f->fi_wait);
+ f->fi_ls = lsinfo;
+ f->fi_flags = 0;
+ get_file_info(f);
+ set_bit(1, &f->fi_flags);
+
+ file->private_data = f;
+
+ return 0;
+}
+
+/* Check the user's version matches ours */
+static int check_version(struct dlm_write_request *req)
+{
+ if (req->version[0] != DLM_DEVICE_VERSION_MAJOR ||
+ (req->version[0] == DLM_DEVICE_VERSION_MAJOR &&
+ req->version[1] > DLM_DEVICE_VERSION_MINOR)) {
+
+ printk(KERN_DEBUG "dlm: process %s (%d) version mismatch "
+ "user (%d.%d.%d) kernel (%d.%d.%d)\n",
+ current->comm,
+ current->pid,
+ req->version[0],
+ req->version[1],
+ req->version[2],
+ DLM_DEVICE_VERSION_MAJOR,
+ DLM_DEVICE_VERSION_MINOR,
+ DLM_DEVICE_VERSION_PATCH);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+/* Close on lockspace device */
+static int dlm_close(struct inode *inode, struct file *file)
+{
+ struct file_info *f = file->private_data;
+ struct lock_info li;
+ struct lock_info *old_li, *safe;
+ sigset_t tmpsig;
+ sigset_t allsigs;
+ struct user_ls *lsinfo;
+ DECLARE_WAITQUEUE(wq, current);
+
+ lsinfo = find_lockspace(iminor(inode));
+ if (!lsinfo)
+ return -ENOENT;
+
+ /* Mark this closed so that ASTs will not be delivered any more */
+ clear_bit(1, &f->fi_flags);
+
+ /* Block signals while we are doing this */
+ sigfillset(&allsigs);
+ sigprocmask(SIG_BLOCK, &allsigs, &tmpsig);
+
+ /* We use our own lock_info struct here, so that any
+ * outstanding "real" ASTs will be delivered with the
+ * corresponding "real" params, thus freeing the lock_info
+ * that belongs the lock. This catches the corner case where
+ * a lock is BUSY when we try to unlock it here
+ */
+ memset(&li, 0, sizeof(li));
+ clear_bit(LI_FLAG_COMPLETE, &li.li_flags);
+ init_waitqueue_head(&li.li_waitq);
+ add_wait_queue(&li.li_waitq, &wq);
+
+ /*
+ * Free any outstanding locks, they are on the
+ * list in LIFO order so there should be no problems
+ * about unlocking parents before children.
+ */
+ list_for_each_entry_safe(old_li, safe, &f->fi_li_list, li_ownerqueue) {
+ int status;
+ int flags = 0;
+
+ /* Don't unlock persistent locks, just mark them orphaned */
+ if (test_bit(LI_FLAG_PERSISTENT, &old_li->li_flags)) {
+ list_del(&old_li->li_ownerqueue);
+
+ /* Update master copy */
+ /* TODO: Check locking core updates the local and
+ remote ORPHAN flags */
+ li.li_lksb.sb_lkid = old_li->li_lksb.sb_lkid;
+ status = dlm_lock(f->fi_ls->ls_lockspace,
+ old_li->li_grmode, &li.li_lksb,
+ DLM_LKF_CONVERT|DLM_LKF_ORPHAN,
+ NULL, 0, 0, ast_routine, NULL,
+ NULL, NULL);
+ if (status != 0)
+ printk("dlm: Error orphaning lock %x: %d\n",
+ old_li->li_lksb.sb_lkid, status);
+
+ /* But tidy our references in it */
+ release_lockinfo(old_li);
+ continue;
+ }
+
+ clear_bit(LI_FLAG_COMPLETE, &li.li_flags);
+
+ flags = DLM_LKF_FORCEUNLOCK;
+ if (old_li->li_grmode >= DLM_LOCK_PW)
+ flags |= DLM_LKF_IVVALBLK;
+
+ status = dlm_unlock(f->fi_ls->ls_lockspace,
+ old_li->li_lksb.sb_lkid, flags,
+ &li.li_lksb, &li);
+
+ /* Must wait for it to complete as the next lock could be its
+ * parent */
+ if (status == 0)
+ wait_for_ast(&li);
+
+ /* Unlock suceeded, free the lock_info struct. */
+ if (status == 0)
+ release_lockinfo(old_li);
+ }
+
+ remove_wait_queue(&li.li_waitq, &wq);
+
+ /*
+ * If this is the last reference to the lockspace
+ * then free the struct. If it's an AUTOFREE lockspace
+ * then free the whole thing.
+ */
+ down(&user_ls_lock);
+ if (atomic_dec_and_test(&lsinfo->ls_refcnt)) {
+
+ if (lsinfo->ls_lockspace) {
+ if (test_bit(LS_FLAG_AUTOFREE, &lsinfo->ls_flags)) {
+ unregister_lockspace(lsinfo, 1);
+ }
+ } else {
+ kfree(lsinfo->ls_miscinfo.name);
+ kfree(lsinfo);
+ }
+ }
+ up(&user_ls_lock);
+ put_file_info(f);
+
+ /* Restore signals */
+ sigprocmask(SIG_SETMASK, &tmpsig, NULL);
+ recalc_sigpending();
+
+ return 0;
+}
+
+static int do_user_create_lockspace(struct file_info *fi, uint8_t cmd,
+ struct dlm_lspace_params *kparams)
+{
+ int status;
+ struct user_ls *lsinfo;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ status = register_lockspace(kparams->name, &lsinfo, kparams->flags);
+
+ /* If it succeeded then return the minor number */
+ if (status == 0)
+ status = lsinfo->ls_miscinfo.minor;
+
+ return status;
+}
+
+static int do_user_remove_lockspace(struct file_info *fi, uint8_t cmd,
+ struct dlm_lspace_params *kparams)
+{
+ int status;
+ int force = 1;
+ struct user_ls *lsinfo;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ down(&user_ls_lock);
+ lsinfo = __find_lockspace(kparams->minor);
+ if (!lsinfo) {
+ up(&user_ls_lock);
+ return -EINVAL;
+ }
+
+ if (kparams->flags & DLM_USER_LSFLG_FORCEFREE)
+ force = 2;
+
+ status = unregister_lockspace(lsinfo, force);
+ up(&user_ls_lock);
+
+ return status;
+}
+
+/* Read call, might block if no ASTs are waiting.
+ * It will only ever return one message at a time, regardless
+ * of how many are pending.
+ */
+static ssize_t dlm_read(struct file *file, char __user *buffer, size_t count,
+ loff_t *ppos)
+{
+ struct file_info *fi = file->private_data;
+ struct ast_info *ast;
+ int data_size;
+ int offset;
+ DECLARE_WAITQUEUE(wait, current);
+
+ if (count < sizeof(struct dlm_lock_result))
+ return -EINVAL;
+
+ spin_lock(&fi->fi_ast_lock);
+ if (list_empty(&fi->fi_ast_list)) {
+
+ /* No waiting ASTs.
+ * Return EOF if the lockspace been deleted.
+ */
+ if (test_bit(LS_FLAG_DELETED, &fi->fi_ls->ls_flags))
+ return 0;
+
+ if (file->f_flags & O_NONBLOCK) {
+ spin_unlock(&fi->fi_ast_lock);
+ return -EAGAIN;
+ }
+
+ add_wait_queue(&fi->fi_wait, &wait);
+
+ repeat:
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (list_empty(&fi->fi_ast_list) &&
+ !signal_pending(current)) {
+
+ spin_unlock(&fi->fi_ast_lock);
+ schedule();
+ spin_lock(&fi->fi_ast_lock);
+ goto repeat;
+ }
+
+ current->state = TASK_RUNNING;
+ remove_wait_queue(&fi->fi_wait, &wait);
+
+ if (signal_pending(current)) {
+ spin_unlock(&fi->fi_ast_lock);
+ return -ERESTARTSYS;
+ }
+ }
+
+ ast = list_entry(fi->fi_ast_list.next, struct ast_info, list);
+ list_del(&ast->list);
+ spin_unlock(&fi->fi_ast_lock);
+
+ /* Work out the size of the returned data */
+ data_size = sizeof(struct dlm_lock_result);
+ if (ast->lvb_updated && ast->result.lksb.sb_lvbptr)
+ data_size += DLM_USER_LVB_LEN;
+
+ offset = sizeof(struct dlm_lock_result);
+
+ /* Room for the extended data ? */
+ if (count >= data_size) {
+
+ if (ast->lvb_updated && ast->result.lksb.sb_lvbptr) {
+ if (copy_to_user(buffer+offset,
+ ast->result.lksb.sb_lvbptr,
+ DLM_USER_LVB_LEN))
+ return -EFAULT;
+ ast->result.lvb_offset = offset;
+ offset += DLM_USER_LVB_LEN;
+ }
+ }
+
+ ast->result.length = data_size;
+ /* Copy the header now it has all the offsets in it */
+ if (copy_to_user(buffer, &ast->result, sizeof(struct dlm_lock_result)))
+ offset = -EFAULT;
+
+ /* If we only returned a header and there's more to come then put it
+ back on the list */
+ if (count < data_size) {
+ spin_lock(&fi->fi_ast_lock);
+ list_add(&ast->list, &fi->fi_ast_list);
+ spin_unlock(&fi->fi_ast_lock);
+ } else
+ kfree(ast);
+ return offset;
+}
+
+static unsigned int dlm_poll(struct file *file, poll_table *wait)
+{
+ struct file_info *fi = file->private_data;
+
+ poll_wait(file, &fi->fi_wait, wait);
+
+ spin_lock(&fi->fi_ast_lock);
+ if (!list_empty(&fi->fi_ast_list)) {
+ spin_unlock(&fi->fi_ast_lock);
+ return POLLIN | POLLRDNORM;
+ }
+
+ spin_unlock(&fi->fi_ast_lock);
+ return 0;
+}
+
+static struct lock_info *allocate_lockinfo(struct file_info *fi, uint8_t cmd,
+ struct dlm_lock_params *kparams)
+{
+ struct lock_info *li;
+
+ if (!try_module_get(THIS_MODULE))
+ return NULL;
+
+ li = kmalloc(sizeof(struct lock_info), GFP_KERNEL);
+ if (li) {
+ li->li_magic = LOCKINFO_MAGIC;
+ li->li_file = fi;
+ li->li_cmd = cmd;
+ li->li_flags = 0;
+ li->li_grmode = -1;
+ li->li_rqmode = -1;
+ li->li_pend_bastparam = NULL;
+ li->li_pend_bastaddr = NULL;
+ li->li_castaddr = NULL;
+ li->li_castparam = NULL;
+ li->li_lksb.sb_lvbptr = NULL;
+ li->li_bastaddr = kparams->bastaddr;
+ li->li_bastparam = kparams->bastparam;
+
+ get_file_info(fi);
+ }
+ return li;
+}
+
+static int do_user_lock(struct file_info *fi, uint8_t cmd,
+ struct dlm_lock_params *kparams)
+{
+ struct lock_info *li;
+ int status;
+
+ /*
+ * Validate things that we need to have correct.
+ */
+ if (!kparams->castaddr)
+ return -EINVAL;
+
+ if (!kparams->lksb)
+ return -EINVAL;
+
+ /* Persistent child locks are not available yet */
+ if ((kparams->flags & DLM_LKF_PERSISTENT) && kparams->parent)
+ return -EINVAL;
+
+ /* For conversions, there should already be a lockinfo struct,
+ unless we are adopting an orphaned persistent lock */
+ if (kparams->flags & DLM_LKF_CONVERT) {
+
+ li = get_lockinfo(kparams->lkid);
+
+ /* If this is a persistent lock we will have to create a
+ lockinfo again */
+ if (!li && DLM_LKF_PERSISTENT) {
+ li = allocate_lockinfo(fi, cmd, kparams);
+
+ li->li_lksb.sb_lkid = kparams->lkid;
+ li->li_castaddr = kparams->castaddr;
+ li->li_castparam = kparams->castparam;
+
+ /* OK, this isn;t exactly a FIRSTLOCK but it is the
+ first time we've used this lockinfo, and if things
+ fail we want rid of it */
+ init_MUTEX_LOCKED(&li->li_firstlock);
+ set_bit(LI_FLAG_FIRSTLOCK, &li->li_flags);
+ add_lockinfo(li);
+
+ /* TODO: do a query to get the current state ?? */
+ }
+ if (!li)
+ return -EINVAL;
+
+ if (li->li_magic != LOCKINFO_MAGIC)
+ return -EINVAL;
+
+ /* For conversions don't overwrite the current blocking AST
+ info so that:
+ a) if a blocking AST fires before the conversion is queued
+ it runs the current handler
+ b) if the conversion is cancelled, the original blocking AST
+ declaration is active
+ The pend_ info is made active when the conversion
+ completes.
+ */
+ li->li_pend_bastaddr = kparams->bastaddr;
+ li->li_pend_bastparam = kparams->bastparam;
+ } else {
+ li = allocate_lockinfo(fi, cmd, kparams);
+ if (!li)
+ return -ENOMEM;
+
+ /* semaphore to allow us to complete our work before
+ the AST routine runs. In fact we only need (and use) this
+ when the initial lock fails */
+ init_MUTEX_LOCKED(&li->li_firstlock);
+ set_bit(LI_FLAG_FIRSTLOCK, &li->li_flags);
+ }
+
+ li->li_user_lksb = kparams->lksb;
+ li->li_castaddr = kparams->castaddr;
+ li->li_castparam = kparams->castparam;
+ li->li_lksb.sb_lkid = kparams->lkid;
+ li->li_rqmode = kparams->mode;
+ if (kparams->flags & DLM_LKF_PERSISTENT)
+ set_bit(LI_FLAG_PERSISTENT, &li->li_flags);
+
+ /* Copy in the value block */
+ if (kparams->flags & DLM_LKF_VALBLK) {
+ if (!li->li_lksb.sb_lvbptr) {
+ li->li_lksb.sb_lvbptr = kmalloc(DLM_USER_LVB_LEN,
+ GFP_KERNEL);
+ if (!li->li_lksb.sb_lvbptr) {
+ status = -ENOMEM;
+ goto out_err;
+ }
+ }
+
+ memcpy(li->li_lksb.sb_lvbptr, kparams->lvb, DLM_USER_LVB_LEN);
+ }
+
+ /* Lock it ... */
+ status = dlm_lock(fi->fi_ls->ls_lockspace,
+ kparams->mode, &li->li_lksb,
+ kparams->flags,
+ kparams->name, kparams->namelen,
+ kparams->parent,
+ ast_routine,
+ li,
+ (li->li_pend_bastaddr || li->li_bastaddr) ?
+ bast_routine : NULL,
+ kparams->range.ra_end ? &kparams->range : NULL);
+ if (status)
+ goto out_err;
+
+ /* If it succeeded (this far) with a new lock then keep track of
+ it on the file's lockinfo list */
+ if (!status && test_bit(LI_FLAG_FIRSTLOCK, &li->li_flags)) {
+
+ spin_lock(&fi->fi_li_lock);
+ list_add(&li->li_ownerqueue, &fi->fi_li_list);
+ spin_unlock(&fi->fi_li_lock);
+ if (add_lockinfo(li))
+ printk(KERN_WARNING "Add lockinfo failed\n");
+
+ up(&li->li_firstlock);
+ }
+
+ /* Return the lockid as the user needs it /now/ */
+ return li->li_lksb.sb_lkid;
+
+ out_err:
+ if (test_bit(LI_FLAG_FIRSTLOCK, &li->li_flags))
+ release_lockinfo(li);
+ return status;
+
+}
+
+static int do_user_unlock(struct file_info *fi, uint8_t cmd,
+ struct dlm_lock_params *kparams)
+{
+ struct lock_info *li;
+ int status;
+ int convert_cancel = 0;
+
+ li = get_lockinfo(kparams->lkid);
+ if (!li) {
+ li = allocate_lockinfo(fi, cmd, kparams);
+ spin_lock(&fi->fi_li_lock);
+ list_add(&li->li_ownerqueue, &fi->fi_li_list);
+ spin_unlock(&fi->fi_li_lock);
+ }
+ if (!li)
+ return -ENOMEM;
+
+ if (li->li_magic != LOCKINFO_MAGIC)
+ return -EINVAL;
+
+ li->li_user_lksb = kparams->lksb;
+ li->li_castparam = kparams->castparam;
+ li->li_cmd = cmd;
+
+ /* Cancelling a conversion doesn't remove the lock...*/
+ if (kparams->flags & DLM_LKF_CANCEL && li->li_grmode != -1)
+ convert_cancel = 1;
+
+ /* dlm_unlock() passes a 0 for castaddr which means don't overwrite
+ the existing li_castaddr as that's the completion routine for
+ unlocks. dlm_unlock_wait() specifies a new AST routine to be
+ executed when the unlock completes. */
+ if (kparams->castaddr)
+ li->li_castaddr = kparams->castaddr;
+
+ /* Use existing lksb & astparams */
+ status = dlm_unlock(fi->fi_ls->ls_lockspace,
+ kparams->lkid,
+ kparams->flags, &li->li_lksb, li);
+
+ if (!status && !convert_cancel) {
+ spin_lock(&fi->fi_li_lock);
+ list_del(&li->li_ownerqueue);
+ spin_unlock(&fi->fi_li_lock);
+ }
+
+ return status;
+}
+
+/* Write call, submit a locking request */
+static ssize_t dlm_write(struct file *file, const char __user *buffer,
+ size_t count, loff_t *ppos)
+{
+ struct file_info *fi = file->private_data;
+ struct dlm_write_request *kparams;
+ sigset_t tmpsig;
+ sigset_t allsigs;
+ int status;
+
+ /* -1 because lock name is optional */
+ if (count < sizeof(struct dlm_write_request)-1)
+ return -EINVAL;
+
+ /* Has the lockspace been deleted */
+ if (fi && test_bit(LS_FLAG_DELETED, &fi->fi_ls->ls_flags))
+ return -ENOENT;
+
+ kparams = kmalloc(count, GFP_KERNEL);
+ if (!kparams)
+ return -ENOMEM;
+
+ status = -EFAULT;
+ /* Get the command info */
+ if (copy_from_user(kparams, buffer, count))
+ goto out_free;
+
+ status = -EBADE;
+ if (check_version(kparams))
+ goto out_free;
+
+ /* Block signals while we are doing this */
+ sigfillset(&allsigs);
+ sigprocmask(SIG_BLOCK, &allsigs, &tmpsig);
+
+ status = -EINVAL;
+ switch (kparams->cmd)
+ {
+ case DLM_USER_LOCK:
+ if (!fi) goto out_sig;
+ status = do_user_lock(fi, kparams->cmd, &kparams->i.lock);
+ break;
+
+ case DLM_USER_UNLOCK:
+ if (!fi) goto out_sig;
+ status = do_user_unlock(fi, kparams->cmd, &kparams->i.lock);
+ break;
+
+ case DLM_USER_CREATE_LOCKSPACE:
+ if (fi) goto out_sig;
+ status = do_user_create_lockspace(fi, kparams->cmd,
+ &kparams->i.lspace);
+ break;
+
+ case DLM_USER_REMOVE_LOCKSPACE:
+ if (fi) goto out_sig;
+ status = do_user_remove_lockspace(fi, kparams->cmd,
+ &kparams->i.lspace);
+ break;
+ default:
+ printk("Unknown command passed to DLM device : %d\n",
+ kparams->cmd);
+ break;
+ }
+
+ out_sig:
+ /* Restore signals */
+ sigprocmask(SIG_SETMASK, &tmpsig, NULL);
+ recalc_sigpending();
+
+ out_free:
+ kfree(kparams);
+ if (status == 0)
+ return count;
+ else
+ return status;
+}
+
+static struct file_operations _dlm_fops = {
+ .open = dlm_open,
+ .release = dlm_close,
+ .read = dlm_read,
+ .write = dlm_write,
+ .poll = dlm_poll,
+ .owner = THIS_MODULE,
+};
+
+static struct file_operations _dlm_ctl_fops = {
+ .open = dlm_ctl_open,
+ .release = dlm_ctl_close,
+ .write = dlm_write,
+ .owner = THIS_MODULE,
+};
+
+/*
+ * Create control device
+ */
+static int __init dlm_device_init(void)
+{
+ int r;
+
+ INIT_LIST_HEAD(&user_ls_list);
+ init_MUTEX(&user_ls_lock);
+ rwlock_init(&lockinfo_lock);
+
+ ctl_device.name = "dlm-control";
+ ctl_device.fops = &_dlm_ctl_fops;
+ ctl_device.minor = MISC_DYNAMIC_MINOR;
+
+ r = misc_register(&ctl_device);
+ if (r) {
+ printk(KERN_ERR "dlm: misc_register failed for control dev\n");
+ return r;
+ }
+
+ return 0;
+}
+
+static void __exit dlm_device_exit(void)
+{
+ misc_deregister(&ctl_device);
+}
+
+MODULE_DESCRIPTION("Distributed Lock Manager device interface");
+MODULE_AUTHOR("Red Hat, Inc.");
+MODULE_LICENSE("GPL");
+
+module_init(dlm_device_init);
+module_exit(dlm_device_exit);
diff --git a/fs/dlm/dir.c b/fs/dlm/dir.c
new file mode 100644
index 0000000..0f1dde5
--- /dev/null
+++ b/fs/dlm/dir.c
@@ -0,0 +1,423 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#include "dlm_internal.h"
+#include "lockspace.h"
+#include "member.h"
+#include "lowcomms.h"
+#include "rcom.h"
+#include "config.h"
+#include "memory.h"
+#include "recover.h"
+#include "util.h"
+#include "lock.h"
+#include "dir.h"
+
+
+static void put_free_de(struct dlm_ls *ls, struct dlm_direntry *de)
+{
+ spin_lock(&ls->ls_recover_list_lock);
+ list_add(&de->list, &ls->ls_recover_list);
+ spin_unlock(&ls->ls_recover_list_lock);
+}
+
+static struct dlm_direntry *get_free_de(struct dlm_ls *ls, int len)
+{
+ int found = FALSE;
+ struct dlm_direntry *de;
+
+ spin_lock(&ls->ls_recover_list_lock);
+ list_for_each_entry(de, &ls->ls_recover_list, list) {
+ if (de->length == len) {
+ list_del(&de->list);
+ de->master_nodeid = 0;
+ memset(de->name, 0, len);
+ found = TRUE;
+ break;
+ }
+ }
+ spin_unlock(&ls->ls_recover_list_lock);
+
+ if (!found)
+ de = allocate_direntry(ls, len);
+ return de;
+}
+
+void dlm_clear_free_entries(struct dlm_ls *ls)
+{
+ struct dlm_direntry *de;
+
+ spin_lock(&ls->ls_recover_list_lock);
+ while (!list_empty(&ls->ls_recover_list)) {
+ de = list_entry(ls->ls_recover_list.next, struct dlm_direntry,
+ list);
+ list_del(&de->list);
+ free_direntry(de);
+ }
+ spin_unlock(&ls->ls_recover_list_lock);
+}
+
+/*
+ * We use the upper 16 bits of the hash value to select the directory node.
+ * Low bits are used for distribution of rsb's among hash buckets on each node.
+ *
+ * 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.
+ */
+
+int dlm_hash2nodeid(struct dlm_ls *ls, uint32_t hash)
+{
+ struct list_head *tmp;
+ struct dlm_member *memb = NULL;
+ uint32_t node, n = 0;
+ int nodeid;
+
+ if (ls->ls_num_nodes == 1) {
+ nodeid = dlm_our_nodeid();
+ goto out;
+ }
+
+ if (ls->ls_node_array) {
+ node = (hash >> 16) % ls->ls_total_weight;
+ nodeid = ls->ls_node_array[node];
+ goto out;
+ }
+
+ /* make_member_array() failed to kmalloc ls_node_array... */
+
+ node = (hash >> 16) % ls->ls_num_nodes;
+
+ list_for_each(tmp, &ls->ls_nodes) {
+ if (n++ != node)
+ continue;
+ memb = list_entry(tmp, struct dlm_member, list);
+ break;
+ }
+
+ DLM_ASSERT(memb , printk("num_nodes=%u n=%u node=%u\n",
+ ls->ls_num_nodes, n, node););
+ nodeid = memb->nodeid;
+ out:
+ return nodeid;
+}
+
+int dlm_dir_nodeid(struct dlm_rsb *r)
+{
+ return dlm_hash2nodeid(r->res_ls, r->res_hash);
+}
+
+static inline uint32_t dir_hash(struct dlm_ls *ls, char *name, int len)
+{
+ uint32_t val;
+
+ val = jhash(name, len, 0);
+ val &= (ls->ls_dirtbl_size - 1);
+
+ return val;
+}
+
+static void add_entry_to_hash(struct dlm_ls *ls, struct dlm_direntry *de)
+{
+ uint32_t bucket;
+
+ bucket = dir_hash(ls, de->name, de->length);
+ list_add_tail(&de->list, &ls->ls_dirtbl[bucket].list);
+}
+
+static struct dlm_direntry *search_bucket(struct dlm_ls *ls, char *name,
+ int namelen, uint32_t bucket)
+{
+ struct dlm_direntry *de;
+
+ list_for_each_entry(de, &ls->ls_dirtbl[bucket].list, list) {
+ if (de->length == namelen && !memcmp(name, de->name, namelen))
+ goto out;
+ }
+ de = NULL;
+ out:
+ return de;
+}
+
+void dlm_dir_remove_entry(struct dlm_ls *ls, int nodeid, char *name, int namelen)
+{
+ struct dlm_direntry *de;
+ uint32_t bucket;
+
+ bucket = dir_hash(ls, name, namelen);
+
+ write_lock(&ls->ls_dirtbl[bucket].lock);
+
+ de = search_bucket(ls, name, namelen, bucket);
+
+ if (!de) {
+ log_error(ls, "remove fr %u none", nodeid);
+ goto out;
+ }
+
+ if (de->master_nodeid != nodeid) {
+ log_error(ls, "remove fr %u ID %u", nodeid, de->master_nodeid);
+ goto out;
+ }
+
+ list_del(&de->list);
+ free_direntry(de);
+ out:
+ write_unlock(&ls->ls_dirtbl[bucket].lock);
+}
+
+void dlm_dir_clear(struct dlm_ls *ls)
+{
+ struct list_head *head;
+ struct dlm_direntry *de;
+ int i;
+
+ DLM_ASSERT(list_empty(&ls->ls_recover_list), );
+
+ for (i = 0; i < ls->ls_dirtbl_size; i++) {
+ write_lock(&ls->ls_dirtbl[i].lock);
+ head = &ls->ls_dirtbl[i].list;
+ while (!list_empty(head)) {
+ de = list_entry(head->next, struct dlm_direntry, list);
+ list_del(&de->list);
+ put_free_de(ls, de);
+ }
+ write_unlock(&ls->ls_dirtbl[i].lock);
+ }
+}
+
+int dlm_recover_directory(struct dlm_ls *ls)
+{
+ struct dlm_member *memb;
+ struct dlm_direntry *de;
+ 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);
+ if (!last_name)
+ goto out;
+
+ list_for_each_entry(memb, &ls->ls_nodes, list) {
+ memset(last_name, 0, DLM_RESNAME_MAXLEN);
+ last_len = 0;
+
+ for (;;) {
+ error = dlm_recovery_stopped(ls);
+ if (error)
+ goto out_free;
+
+ error = dlm_rcom_names(ls, memb->nodeid,
+ last_name, last_len);
+ if (error)
+ goto out_free;
+
+ schedule();
+
+ /*
+ * pick namelen/name pairs out of received buffer
+ */
+
+ b = ls->ls_recover_buf + sizeof(struct dlm_rcom);
+
+ for (;;) {
+ memcpy(&namelen, b, sizeof(uint16_t));
+ namelen = be16_to_cpu(namelen);
+ b += sizeof(uint16_t);
+
+ /* namelen of 0xFFFFF marks end of names for
+ this node; namelen of 0 marks end of the
+ buffer */
+
+ if (namelen == 0xFFFF)
+ goto done;
+ if (!namelen)
+ break;
+
+ error = -ENOMEM;
+ de = get_free_de(ls, namelen);
+ if (!de)
+ goto out_free;
+
+ de->master_nodeid = memb->nodeid;
+ de->length = namelen;
+ last_len = namelen;
+ memcpy(de->name, b, namelen);
+ memcpy(last_name, b, namelen);
+ b += namelen;
+
+ add_entry_to_hash(ls, de);
+ count++;
+ }
+ }
+ done:
+ ;
+ }
+
+ out_status:
+ error = 0;
+ dlm_set_recover_status(ls, DLM_RS_DIR);
+ log_debug(ls, "dlm_recover_directory %d entries", count);
+ out_free:
+ kfree(last_name);
+ out:
+ dlm_clear_free_entries(ls);
+ return error;
+}
+
+static int get_entry(struct dlm_ls *ls, int nodeid, char *name,
+ int namelen, int *r_nodeid)
+{
+ struct dlm_direntry *de, *tmp;
+ uint32_t bucket;
+
+ bucket = dir_hash(ls, name, namelen);
+
+ write_lock(&ls->ls_dirtbl[bucket].lock);
+ de = search_bucket(ls, name, namelen, bucket);
+ if (de) {
+ *r_nodeid = de->master_nodeid;
+ write_unlock(&ls->ls_dirtbl[bucket].lock);
+ if (*r_nodeid == nodeid)
+ return -EEXIST;
+ return 0;
+ }
+
+ write_unlock(&ls->ls_dirtbl[bucket].lock);
+
+ de = allocate_direntry(ls, namelen);
+ if (!de)
+ return -ENOMEM;
+
+ de->master_nodeid = nodeid;
+ de->length = namelen;
+ memcpy(de->name, name, namelen);
+
+ write_lock(&ls->ls_dirtbl[bucket].lock);
+ tmp = search_bucket(ls, name, namelen, bucket);
+ if (tmp) {
+ free_direntry(de);
+ de = tmp;
+ } else {
+ list_add_tail(&de->list, &ls->ls_dirtbl[bucket].list);
+ }
+ *r_nodeid = de->master_nodeid;
+ write_unlock(&ls->ls_dirtbl[bucket].lock);
+ return 0;
+}
+
+int dlm_dir_lookup(struct dlm_ls *ls, int nodeid, char *name, int namelen,
+ int *r_nodeid)
+{
+ return get_entry(ls, nodeid, name, namelen, r_nodeid);
+}
+
+/* Copy the names of master rsb's into the buffer provided.
+ Only select names whose dir node is the given nodeid. */
+
+void dlm_copy_master_names(struct dlm_ls *ls, char *inbuf, int inlen,
+ char *outbuf, int outlen, int nodeid)
+{
+ struct list_head *list;
+ struct dlm_rsb *start_r = NULL, *r = NULL;
+ int offset = 0, start_namelen, error, dir_nodeid;
+ char *start_name;
+ uint16_t be_namelen;
+
+ /*
+ * Find the rsb where we left off (or start again)
+ */
+
+ start_namelen = inlen;
+ start_name = inbuf;
+
+ if (start_namelen > 1) {
+ /*
+ * We could also use a find_rsb_root() function here that
+ * searched the ls_root_list.
+ */
+ error = dlm_find_rsb(ls, start_name, start_namelen, R_MASTER,
+ &start_r);
+ DLM_ASSERT(!error && start_r,
+ printk("error %d\n", error););
+ DLM_ASSERT(!list_empty(&start_r->res_root_list),
+ dlm_print_rsb(start_r););
+ dlm_put_rsb(start_r);
+ }
+
+ /*
+ * Send rsb names for rsb's we're master of and whose directory node
+ * matches the requesting node.
+ */
+
+ down_read(&ls->ls_root_sem);
+ if (start_r)
+ list = start_r->res_root_list.next;
+ else
+ list = ls->ls_root_list.next;
+
+ for (offset = 0; list != &ls->ls_root_list; list = list->next) {
+ r = list_entry(list, struct dlm_rsb, res_root_list);
+ if (r->res_nodeid)
+ continue;
+
+ dir_nodeid = dlm_dir_nodeid(r);
+ if (dir_nodeid != nodeid)
+ continue;
+
+ /*
+ * The block ends when we can't fit the following in the
+ * remaining buffer space:
+ * namelen (uint16_t) +
+ * name (r->res_length) +
+ * end-of-block record 0x0000 (uint16_t)
+ */
+
+ if (offset + sizeof(uint16_t)*2 + r->res_length > outlen) {
+ /* Write end-of-block record */
+ be_namelen = 0;
+ memcpy(outbuf + offset, &be_namelen, sizeof(uint16_t));
+ offset += sizeof(uint16_t);
+ goto out;
+ }
+
+ be_namelen = cpu_to_be16(r->res_length);
+ memcpy(outbuf + offset, &be_namelen, sizeof(uint16_t));
+ offset += sizeof(uint16_t);
+ memcpy(outbuf + offset, r->res_name, r->res_length);
+ offset += r->res_length;
+ }
+
+ /*
+ * If we've reached the end of the list (and there's room) write a
+ * terminating record.
+ */
+
+ if ((list == &ls->ls_root_list) &&
+ (offset + sizeof(uint16_t) <= outlen)) {
+ be_namelen = 0xFFFF;
+ memcpy(outbuf + offset, &be_namelen, sizeof(uint16_t));
+ offset += sizeof(uint16_t);
+ }
+
+ out:
+ up_read(&ls->ls_root_sem);
+}
+
diff --git a/fs/dlm/dir.h b/fs/dlm/dir.h
new file mode 100644
index 0000000..0b0eb12
--- /dev/null
+++ b/fs/dlm/dir.h
@@ -0,0 +1,30 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#ifndef __DIR_DOT_H__
+#define __DIR_DOT_H__
+
+
+int dlm_dir_nodeid(struct dlm_rsb *rsb);
+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);
+int dlm_recover_directory(struct dlm_ls *ls);
+int dlm_dir_lookup(struct dlm_ls *ls, int nodeid, char *name, int namelen,
+ int *r_nodeid);
+void dlm_copy_master_names(struct dlm_ls *ls, char *inbuf, int inlen,
+ char *outbuf, int outlen, int nodeid);
+
+#endif /* __DIR_DOT_H__ */
+
diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
new file mode 100644
index 0000000..0020cd0
--- /dev/null
+++ b/fs/dlm/dlm_internal.h
@@ -0,0 +1,518 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#ifndef __DLM_INTERNAL_DOT_H__
+#define __DLM_INTERNAL_DOT_H__
+
+/*
+ * This is the main header file to be included in each DLM source file.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/ctype.h>
+#include <linux/spinlock.h>
+#include <linux/vmalloc.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/random.h>
+#include <linux/delay.h>
+#include <linux/socket.h>
+#include <linux/kthread.h>
+#include <linux/kobject.h>
+#include <linux/kref.h>
+#include <linux/kernel.h>
+#include <linux/jhash.h>
+#include <asm/semaphore.h>
+#include <asm/uaccess.h>
+
+#include <linux/dlm.h>
+
+#define DLM_LOCKSPACE_LEN 64
+
+#ifndef TRUE
+#define TRUE 1
+#endif
+
+#ifndef FALSE
+#define FALSE 0
+#endif
+
+#if (BITS_PER_LONG == 64)
+#define PRIx64 "lx"
+#else
+#define PRIx64 "Lx"
+#endif
+
+/* Size of the temp buffer midcomms allocates on the stack.
+ We try to make this large enough so most messages fit.
+ FIXME: should sctp make this unnecessary? */
+
+#define DLM_INBUF_LEN 148
+
+struct dlm_ls;
+struct dlm_lkb;
+struct dlm_rsb;
+struct dlm_member;
+struct dlm_lkbtable;
+struct dlm_rsbtable;
+struct dlm_dirtable;
+struct dlm_direntry;
+struct dlm_recover;
+struct dlm_header;
+struct dlm_message;
+struct dlm_rcom;
+struct dlm_mhandle;
+
+#define log_print(fmt, args...) \
+ printk(KERN_ERR "dlm: "fmt"\n" , ##args)
+#define log_error(ls, fmt, args...) \
+ printk(KERN_ERR "dlm: %s: " fmt "\n", (ls)->ls_name , ##args)
+
+#ifdef DLM_LOG_DEBUG
+#define log_debug(ls, fmt, args...) log_error(ls, fmt, ##args)
+#else
+#define log_debug(ls, fmt, args...)
+#endif
+
+#define DLM_ASSERT(x, do) \
+{ \
+ if (!(x)) \
+ { \
+ printk(KERN_ERR "\nDLM: Assertion failed on line %d of file %s\n" \
+ "DLM: assertion: \"%s\"\n" \
+ "DLM: time = %lu\n", \
+ __LINE__, __FILE__, #x, jiffies); \
+ {do} \
+ printk("\n"); \
+ BUG(); \
+ panic("DLM: Record message above and reboot.\n"); \
+ } \
+}
+
+
+struct dlm_direntry {
+ struct list_head list;
+ uint32_t master_nodeid;
+ uint16_t length;
+ char name[1];
+};
+
+struct dlm_dirtable {
+ struct list_head list;
+ rwlock_t lock;
+};
+
+struct dlm_rsbtable {
+ struct list_head list;
+ struct list_head toss;
+ rwlock_t lock;
+};
+
+struct dlm_lkbtable {
+ struct list_head list;
+ rwlock_t lock;
+ uint16_t counter;
+};
+
+/*
+ * Lockspace member (per node in a ls)
+ */
+
+struct dlm_member {
+ struct list_head list;
+ int nodeid;
+ int weight;
+};
+
+/*
+ * Save and manage recovery state for a lockspace.
+ */
+
+struct dlm_recover {
+ struct list_head list;
+ int *nodeids;
+ int node_count;
+ uint64_t seq;
+};
+
+/*
+ * Pass input args to second stage locking function.
+ */
+
+struct dlm_args {
+ uint32_t flags;
+ void *astaddr;
+ long astparam;
+ void *bastaddr;
+ int mode;
+ struct dlm_lksb *lksb;
+ struct dlm_range *range;
+};
+
+
+/*
+ * Lock block
+ *
+ * A lock can be one of three types:
+ *
+ * local copy lock is mastered locally
+ * (lkb_nodeid is zero and DLM_LKF_MSTCPY is not set)
+ * process copy lock is mastered on a remote node
+ * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is not set)
+ * master copy master node's copy of a lock owned by remote node
+ * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is set)
+ *
+ * lkb_exflags: a copy of the most recent flags arg provided to dlm_lock or
+ * dlm_unlock. The dlm does not modify these or use any private flags in
+ * this field; it only contains DLM_LKF_ flags from dlm.h. These flags
+ * are sent as-is to the remote master when the lock is remote.
+ *
+ * lkb_flags: internal dlm flags (DLM_IFL_ prefix) from dlm_internal.h.
+ * Some internal flags are shared between the master and process nodes;
+ * these shared flags are kept in the lower two bytes. One of these
+ * flags set on the master copy will be propagated to the process copy
+ * and v.v. Other internal flags are private to the master or process
+ * node (e.g. DLM_IFL_MSTCPY). These are kept in the high two bytes.
+ *
+ * lkb_sbflags: status block flags. These flags are copied directly into
+ * the caller's lksb.sb_flags prior to the dlm_lock/dlm_unlock completion
+ * ast. All defined in dlm.h with DLM_SBF_ prefix.
+ *
+ * lkb_status: the lock status indicates which rsb queue the lock is
+ * on, grant, convert, or wait. DLM_LKSTS_ WAITING/GRANTED/CONVERT
+ *
+ * lkb_wait_type: the dlm message type (DLM_MSG_ prefix) for which a
+ * reply is needed. Only set when the lkb is on the lockspace waiters
+ * list awaiting a reply from a remote node.
+ *
+ * lkb_nodeid: when the lkb is a local copy, nodeid is 0; when the lkb
+ * is a master copy, nodeid specifies the remote lock holder, when the
+ * lkb is a process copy, the nodeid specifies the lock master.
+ */
+
+/* lkb_ast_type */
+
+#define AST_COMP 1
+#define AST_BAST 2
+
+/* lkb_range[] */
+
+#define GR_RANGE_START 0
+#define GR_RANGE_END 1
+#define RQ_RANGE_START 2
+#define RQ_RANGE_END 3
+
+/* lkb_status */
+
+#define DLM_LKSTS_WAITING 1
+#define DLM_LKSTS_GRANTED 2
+#define DLM_LKSTS_CONVERT 3
+
+/* lkb_flags */
+
+#define DLM_IFL_MSTCPY 0x00010000
+#define DLM_IFL_RESEND 0x00020000
+#define DLM_IFL_RANGE 0x00000001
+
+struct dlm_lkb {
+ struct dlm_rsb *lkb_resource; /* the rsb */
+ struct kref lkb_ref;
+ int lkb_nodeid; /* copied from rsb */
+ int lkb_ownpid; /* pid of lock owner */
+ uint32_t lkb_id; /* our lock ID */
+ uint32_t lkb_remid; /* lock ID on remote partner */
+ uint32_t lkb_exflags; /* external flags from caller */
+ uint32_t lkb_sbflags; /* lksb flags */
+ uint32_t lkb_flags; /* internal flags */
+ uint32_t lkb_lvbseq; /* lvb sequence number */
+
+ int8_t lkb_status; /* granted, waiting, convert */
+ int8_t lkb_rqmode; /* requested lock mode */
+ int8_t lkb_grmode; /* granted lock mode */
+ int8_t lkb_bastmode; /* requested mode */
+ int8_t lkb_highbast; /* highest mode bast sent for */
+
+ int8_t lkb_wait_type; /* type of reply waiting for */
+ int8_t lkb_ast_type; /* type of ast queued for */
+
+ struct list_head lkb_idtbl_list; /* lockspace lkbtbl */
+ struct list_head lkb_statequeue; /* rsb g/c/w list */
+ struct list_head lkb_rsb_lookup; /* waiting for rsb lookup */
+ struct list_head lkb_wait_reply; /* waiting for remote reply */
+ struct list_head lkb_astqueue; /* need ast to be sent */
+
+ uint64_t *lkb_range; /* array of gr/rq ranges */
+ char *lkb_lvbptr;
+ struct dlm_lksb *lkb_lksb; /* caller's status block */
+ void *lkb_astaddr; /* caller's ast function */
+ void *lkb_bastaddr; /* caller's bast function */
+ long lkb_astparam; /* caller's ast arg */
+};
+
+
+struct dlm_rsb {
+ struct dlm_ls *res_ls; /* the lockspace */
+ struct kref res_ref;
+ struct semaphore res_sem;
+ unsigned long res_flags;
+ 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;
+ struct list_head res_lookup; /* lkbs waiting on first */
+ struct list_head res_hashchain; /* rsbtbl */
+ struct list_head res_grantqueue;
+ struct list_head res_convertqueue;
+ struct list_head res_waitqueue;
+
+ struct list_head res_root_list; /* used for recovery */
+ struct list_head res_recover_list; /* used for recovery */
+ int res_recover_locks_count;
+
+ char *res_lvbptr;
+ char res_name[1];
+};
+
+/* find_rsb() flags */
+
+#define R_MASTER 1 /* only return rsb if it's a master */
+#define R_CREATE 2 /* create/add rsb if not found */
+
+/* rsb_flags */
+
+enum rsb_flags {
+ RSB_MASTER_UNCERTAIN,
+ RSB_VALNOTVALID,
+ RSB_VALNOTVALID_PREV,
+ RSB_NEW_MASTER,
+ RSB_NEW_MASTER2,
+ RSB_RECOVER_CONVERT,
+};
+
+static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag)
+{
+ __set_bit(flag, &r->res_flags);
+}
+
+static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag)
+{
+ __clear_bit(flag, &r->res_flags);
+}
+
+static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag)
+{
+ return test_bit(flag, &r->res_flags);
+}
+
+
+/* dlm_header is first element of all structs sent between nodes */
+
+#define DLM_HEADER_MAJOR 0x00020000
+#define DLM_HEADER_MINOR 0x00000001
+
+#define DLM_MSG 1
+#define DLM_RCOM 2
+
+struct dlm_header {
+ uint32_t h_version;
+ uint32_t h_lockspace;
+ uint32_t h_nodeid; /* nodeid of sender */
+ uint16_t h_length;
+ uint8_t h_cmd; /* DLM_MSG, DLM_RCOM */
+ uint8_t h_pad;
+};
+
+
+#define DLM_MSG_REQUEST 1
+#define DLM_MSG_CONVERT 2
+#define DLM_MSG_UNLOCK 3
+#define DLM_MSG_CANCEL 4
+#define DLM_MSG_REQUEST_REPLY 5
+#define DLM_MSG_CONVERT_REPLY 6
+#define DLM_MSG_UNLOCK_REPLY 7
+#define DLM_MSG_CANCEL_REPLY 8
+#define DLM_MSG_GRANT 9
+#define DLM_MSG_BAST 10
+#define DLM_MSG_LOOKUP 11
+#define DLM_MSG_REMOVE 12
+#define DLM_MSG_LOOKUP_REPLY 13
+
+struct dlm_message {
+ struct dlm_header m_header;
+ uint32_t m_type; /* DLM_MSG_ */
+ uint32_t m_nodeid;
+ uint32_t m_pid;
+ uint32_t m_lkid; /* lkid on sender */
+ uint32_t m_remid; /* lkid on receiver */
+ uint32_t m_parent_lkid;
+ uint32_t m_parent_remid;
+ uint32_t m_exflags;
+ 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;
+ int m_bastmode;
+ int m_asts;
+ int m_result; /* 0 or -EXXX */
+ uint64_t m_range[2];
+ char m_extra[0]; /* name or lvb */
+};
+
+
+#define DLM_RS_NODES 0x00000001
+#define DLM_RS_NODES_ALL 0x00000002
+#define DLM_RS_DIR 0x00000004
+#define DLM_RS_DIR_ALL 0x00000008
+#define DLM_RS_LOCKS 0x00000010
+#define DLM_RS_LOCKS_ALL 0x00000020
+#define DLM_RS_DONE 0x00000040
+#define DLM_RS_DONE_ALL 0x00000080
+
+#define DLM_RCOM_STATUS 1
+#define DLM_RCOM_NAMES 2
+#define DLM_RCOM_LOOKUP 3
+#define DLM_RCOM_LOCK 4
+#define DLM_RCOM_STATUS_REPLY 5
+#define DLM_RCOM_NAMES_REPLY 6
+#define DLM_RCOM_LOOKUP_REPLY 7
+#define DLM_RCOM_LOCK_REPLY 8
+
+struct dlm_rcom {
+ struct dlm_header rc_header;
+ uint32_t rc_type; /* DLM_RCOM_ */
+ int rc_result; /* multi-purpose */
+ uint64_t rc_id; /* match reply with request */
+ char rc_buf[0];
+};
+
+struct rcom_config {
+ uint32_t rf_lvblen;
+ uint32_t rf_lsflags;
+ uint64_t rf_unused;
+};
+
+struct rcom_lock {
+ uint32_t rl_ownpid;
+ uint32_t rl_lkid;
+ uint32_t rl_remid;
+ uint32_t rl_parent_lkid;
+ uint32_t rl_parent_remid;
+ uint32_t rl_exflags;
+ uint32_t rl_flags;
+ uint32_t rl_lvbseq;
+ int rl_result;
+ int8_t rl_rqmode;
+ int8_t rl_grmode;
+ int8_t rl_status;
+ int8_t rl_asts;
+ uint16_t rl_wait_type;
+ uint16_t rl_namelen;
+ uint64_t rl_range[4];
+ char rl_name[DLM_RESNAME_MAXLEN];
+ char rl_lvb[0];
+};
+
+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_ */
+ struct kobject ls_kobj;
+
+ struct dlm_rsbtable *ls_rsbtbl;
+ uint32_t ls_rsbtbl_size;
+
+ struct dlm_lkbtable *ls_lkbtbl;
+ uint32_t ls_lkbtbl_size;
+
+ struct dlm_dirtable *ls_dirtbl;
+ uint32_t ls_dirtbl_size;
+
+ struct semaphore ls_waiters_sem;
+ struct list_head ls_waiters; /* lkbs needing a reply */
+
+ struct list_head ls_nodes; /* current nodes in ls */
+ struct list_head ls_nodes_gone; /* dead node list, recovery */
+ int ls_num_nodes; /* number of nodes in ls */
+ int ls_low_nodeid;
+ int ls_total_weight;
+ int *ls_node_array;
+
+ struct dlm_rsb ls_stub_rsb; /* for returning errors */
+ struct dlm_lkb ls_stub_lkb; /* for returning errors */
+ struct dlm_message ls_stub_ms; /* for faking a reply */
+
+ struct dentry *ls_debug_dentry; /* debugfs */
+
+ wait_queue_head_t ls_uevent_wait; /* user part of join/leave */
+ int ls_uevent_result;
+
+ /* recovery related */
+
+ struct timer_list ls_timer;
+ struct task_struct *ls_recoverd_task;
+ struct semaphore ls_recoverd_active;
+ spinlock_t ls_recover_lock;
+ uint32_t ls_recover_status; /* DLM_RS_ */
+ uint64_t ls_recover_seq;
+ struct dlm_recover *ls_recover_args;
+ struct rw_semaphore ls_in_recovery; /* block local requests */
+ struct list_head ls_requestqueue;/* queue remote requests */
+ struct semaphore ls_requestqueue_lock;
+ char *ls_recover_buf;
+ struct list_head ls_recover_list;
+ spinlock_t ls_recover_list_lock;
+ int ls_recover_list_count;
+ wait_queue_head_t ls_wait_general;
+
+ struct list_head ls_root_list; /* root resources */
+ struct rw_semaphore ls_root_sem; /* protect root_list */
+
+ int ls_namelen;
+ char ls_name[1];
+};
+
+#define LSFL_WORK 0
+#define LSFL_RUNNING 1
+#define LSFL_RECOVERY_STOP 2
+#define LSFL_RCOM_READY 3
+#define LSFL_UEVENT_WAIT 4
+
+static inline int dlm_locking_stopped(struct dlm_ls *ls)
+{
+ return !test_bit(LSFL_RUNNING, &ls->ls_flags);
+}
+
+static inline int dlm_recovery_stopped(struct dlm_ls *ls)
+{
+ 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__ */
+
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
new file mode 100644
index 0000000..81efb36
--- /dev/null
+++ b/fs/dlm/lock.c
@@ -0,0 +1,3610 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) 2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+/* Central locking logic has four stages:
+
+ dlm_lock()
+ dlm_unlock()
+
+ request_lock(ls, lkb)
+ convert_lock(ls, lkb)
+ unlock_lock(ls, lkb)
+ cancel_lock(ls, lkb)
+
+ _request_lock(r, lkb)
+ _convert_lock(r, lkb)
+ _unlock_lock(r, lkb)
+ _cancel_lock(r, lkb)
+
+ do_request(r, lkb)
+ do_convert(r, lkb)
+ do_unlock(r, lkb)
+ do_cancel(r, lkb)
+
+ Stage 1 (lock, unlock) is mainly about checking input args and
+ splitting into one of the four main operations:
+
+ dlm_lock = request_lock
+ dlm_lock+CONVERT = convert_lock
+ dlm_unlock = unlock_lock
+ dlm_unlock+CANCEL = cancel_lock
+
+ Stage 2, xxxx_lock(), just finds and locks the relevant rsb which is
+ provided to the next stage.
+
+ Stage 3, _xxxx_lock(), determines if the operation is local or remote.
+ When remote, it calls send_xxxx(), when local it calls do_xxxx().
+
+ Stage 4, do_xxxx(), is the guts of the operation. It manipulates the
+ given rsb and lkb and queues callbacks.
+
+ For remote operations, send_xxxx() results in the corresponding do_xxxx()
+ function being executed on the remote node. The connecting send/receive
+ calls on local (L) and remote (R) nodes:
+
+ L: send_xxxx() -> R: receive_xxxx()
+ R: do_xxxx()
+ L: receive_xxxx_reply() <- R: send_xxxx_reply()
+*/
+
+#include "dlm_internal.h"
+#include "memory.h"
+#include "lowcomms.h"
+#include "requestqueue.h"
+#include "util.h"
+#include "dir.h"
+#include "member.h"
+#include "lockspace.h"
+#include "ast.h"
+#include "lock.h"
+#include "rcom.h"
+#include "recover.h"
+#include "lvb_table.h"
+#include "config.h"
+
+static int send_request(struct dlm_rsb *r, struct dlm_lkb *lkb);
+static int send_convert(struct dlm_rsb *r, struct dlm_lkb *lkb);
+static int send_unlock(struct dlm_rsb *r, struct dlm_lkb *lkb);
+static int send_cancel(struct dlm_rsb *r, struct dlm_lkb *lkb);
+static int send_grant(struct dlm_rsb *r, struct dlm_lkb *lkb);
+static int send_bast(struct dlm_rsb *r, struct dlm_lkb *lkb, int mode);
+static int send_lookup(struct dlm_rsb *r, struct dlm_lkb *lkb);
+static int send_remove(struct dlm_rsb *r);
+static int _request_lock(struct dlm_rsb *r, struct dlm_lkb *lkb);
+static void __receive_convert_reply(struct dlm_rsb *r, struct dlm_lkb *lkb,
+ struct dlm_message *ms);
+static int receive_extralen(struct dlm_message *ms);
+
+/*
+ * Lock compatibilty matrix - thanks Steve
+ * UN = Unlocked state. Not really a state, used as a flag
+ * PD = Padding. Used to make the matrix a nice power of two in size
+ * Other states are the same as the VMS DLM.
+ * Usage: matrix[grmode+1][rqmode+1] (although m[rq+1][gr+1] is the same)
+ */
+
+static const int __dlm_compat_matrix[8][8] = {
+ /* UN NL CR CW PR PW EX PD */
+ {1, 1, 1, 1, 1, 1, 1, 0}, /* UN */
+ {1, 1, 1, 1, 1, 1, 1, 0}, /* NL */
+ {1, 1, 1, 1, 1, 1, 0, 0}, /* CR */
+ {1, 1, 1, 1, 0, 0, 0, 0}, /* CW */
+ {1, 1, 1, 0, 1, 0, 0, 0}, /* PR */
+ {1, 1, 1, 0, 0, 0, 0, 0}, /* PW */
+ {1, 1, 0, 0, 0, 0, 0, 0}, /* EX */
+ {0, 0, 0, 0, 0, 0, 0, 0} /* PD */
+};
+
+/*
+ * This defines the direction of transfer of LVB data.
+ * Granted mode is the row; requested mode is the column.
+ * Usage: matrix[grmode+1][rqmode+1]
+ * 1 = LVB is returned to the caller
+ * 0 = LVB is written to the resource
+ * -1 = nothing happens to the LVB
+ */
+
+const int dlm_lvb_operations[8][8] = {
+ /* UN NL CR CW PR PW EX PD*/
+ { -1, 1, 1, 1, 1, 1, 1, -1 }, /* UN */
+ { -1, 1, 1, 1, 1, 1, 1, 0 }, /* NL */
+ { -1, -1, 1, 1, 1, 1, 1, 0 }, /* CR */
+ { -1, -1, -1, 1, 1, 1, 1, 0 }, /* CW */
+ { -1, -1, -1, -1, 1, 1, 1, 0 }, /* PR */
+ { -1, 0, 0, 0, 0, 0, 1, 0 }, /* PW */
+ { -1, 0, 0, 0, 0, 0, 0, 0 }, /* EX */
+ { -1, 0, 0, 0, 0, 0, 0, 0 } /* PD */
+};
+EXPORT_SYMBOL_GPL(dlm_lvb_operations);
+
+#define modes_compat(gr, rq) \
+ __dlm_compat_matrix[(gr)->lkb_grmode + 1][(rq)->lkb_rqmode + 1]
+
+int dlm_modes_compat(int mode1, int mode2)
+{
+ return __dlm_compat_matrix[mode1 + 1][mode2 + 1];
+}
+
+/*
+ * Compatibility matrix for conversions with QUECVT set.
+ * Granted mode is the row; requested mode is the column.
+ * Usage: matrix[grmode+1][rqmode+1]
+ */
+
+static const int __quecvt_compat_matrix[8][8] = {
+ /* UN NL CR CW PR PW EX PD */
+ {0, 0, 0, 0, 0, 0, 0, 0}, /* UN */
+ {0, 0, 1, 1, 1, 1, 1, 0}, /* NL */
+ {0, 0, 0, 1, 1, 1, 1, 0}, /* CR */
+ {0, 0, 0, 0, 1, 1, 1, 0}, /* CW */
+ {0, 0, 0, 1, 0, 1, 1, 0}, /* PR */
+ {0, 0, 0, 0, 0, 0, 1, 0}, /* PW */
+ {0, 0, 0, 0, 0, 0, 0, 0}, /* EX */
+ {0, 0, 0, 0, 0, 0, 0, 0} /* PD */
+};
+
+static void dlm_print_lkb(struct dlm_lkb *lkb)
+{
+ printk(KERN_ERR "lkb: nodeid %d id %x remid %x exflags %x flags %x\n"
+ " status %d rqmode %d grmode %d wait_type %d ast_type %d\n",
+ lkb->lkb_nodeid, lkb->lkb_id, lkb->lkb_remid, lkb->lkb_exflags,
+ lkb->lkb_flags, lkb->lkb_status, lkb->lkb_rqmode,
+ lkb->lkb_grmode, lkb->lkb_wait_type, lkb->lkb_ast_type);
+}
+
+void dlm_print_rsb(struct dlm_rsb *r)
+{
+ printk(KERN_ERR "rsb: nodeid %d flags %lx first %x rlc %d name %s\n",
+ r->res_nodeid, r->res_flags, r->res_first_lkid,
+ r->res_recover_locks_count, r->res_name);
+}
+
+/* Threads cannot use the lockspace while it's being recovered */
+
+static inline void lock_recovery(struct dlm_ls *ls)
+{
+ down_read(&ls->ls_in_recovery);
+}
+
+static inline void unlock_recovery(struct dlm_ls *ls)
+{
+ up_read(&ls->ls_in_recovery);
+}
+
+static inline int lock_recovery_try(struct dlm_ls *ls)
+{
+ return down_read_trylock(&ls->ls_in_recovery);
+}
+
+static inline int can_be_queued(struct dlm_lkb *lkb)
+{
+ return !(lkb->lkb_exflags & DLM_LKF_NOQUEUE);
+}
+
+static inline int force_blocking_asts(struct dlm_lkb *lkb)
+{
+ return (lkb->lkb_exflags & DLM_LKF_NOQUEUEBAST);
+}
+
+static inline int is_demoted(struct dlm_lkb *lkb)
+{
+ return (lkb->lkb_sbflags & DLM_SBF_DEMOTED);
+}
+
+static inline int is_remote(struct dlm_rsb *r)
+{
+ DLM_ASSERT(r->res_nodeid >= 0, dlm_print_rsb(r););
+ return !!r->res_nodeid;
+}
+
+static inline int is_process_copy(struct dlm_lkb *lkb)
+{
+ return (lkb->lkb_nodeid && !(lkb->lkb_flags & DLM_IFL_MSTCPY));
+}
+
+static inline int is_master_copy(struct dlm_lkb *lkb)
+{
+ if (lkb->lkb_flags & DLM_IFL_MSTCPY)
+ DLM_ASSERT(lkb->lkb_nodeid, dlm_print_lkb(lkb););
+ return (lkb->lkb_flags & DLM_IFL_MSTCPY) ? TRUE : FALSE;
+}
+
+static inline int middle_conversion(struct dlm_lkb *lkb)
+{
+ if ((lkb->lkb_grmode==DLM_LOCK_PR && lkb->lkb_rqmode==DLM_LOCK_CW) ||
+ (lkb->lkb_rqmode==DLM_LOCK_PR && lkb->lkb_grmode==DLM_LOCK_CW))
+ return TRUE;
+ return FALSE;
+}
+
+static inline int down_conversion(struct dlm_lkb *lkb)
+{
+ return (!middle_conversion(lkb) && lkb->lkb_rqmode < lkb->lkb_grmode);
+}
+
+static void queue_cast(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv)
+{
+ if (is_master_copy(lkb))
+ return;
+
+ DLM_ASSERT(lkb->lkb_lksb, dlm_print_lkb(lkb););
+
+ lkb->lkb_lksb->sb_status = rv;
+ lkb->lkb_lksb->sb_flags = lkb->lkb_sbflags;
+
+ dlm_add_ast(lkb, AST_COMP);
+}
+
+static void queue_bast(struct dlm_rsb *r, struct dlm_lkb *lkb, int rqmode)
+{
+ if (is_master_copy(lkb))
+ send_bast(r, lkb, rqmode);
+ else {
+ lkb->lkb_bastmode = rqmode;
+ dlm_add_ast(lkb, AST_BAST);
+ }
+}
+
+/*
+ * Basic operations on rsb's and lkb's
+ */
+
+static struct dlm_rsb *create_rsb(struct dlm_ls *ls, char *name, int len)
+{
+ struct dlm_rsb *r;
+
+ r = allocate_rsb(ls, len);
+ if (!r)
+ return NULL;
+
+ r->res_ls = ls;
+ r->res_length = len;
+ memcpy(r->res_name, name, len);
+ init_MUTEX(&r->res_sem);
+
+ INIT_LIST_HEAD(&r->res_lookup);
+ INIT_LIST_HEAD(&r->res_grantqueue);
+ INIT_LIST_HEAD(&r->res_convertqueue);
+ INIT_LIST_HEAD(&r->res_waitqueue);
+ INIT_LIST_HEAD(&r->res_root_list);
+ INIT_LIST_HEAD(&r->res_recover_list);
+
+ return r;
+}
+
+static int search_rsb_list(struct list_head *head, char *name, int len,
+ unsigned int flags, struct dlm_rsb **r_ret)
+{
+ struct dlm_rsb *r;
+ int error = 0;
+
+ list_for_each_entry(r, head, res_hashchain) {
+ if (len == r->res_length && !memcmp(name, r->res_name, len))
+ goto found;
+ }
+ return -ENOENT;
+
+ found:
+ if (r->res_nodeid && (flags & R_MASTER))
+ error = -ENOTBLK;
+ *r_ret = r;
+ return error;
+}
+
+static int _search_rsb(struct dlm_ls *ls, char *name, int len, int b,
+ unsigned int flags, struct dlm_rsb **r_ret)
+{
+ struct dlm_rsb *r;
+ int error;
+
+ error = search_rsb_list(&ls->ls_rsbtbl[b].list, name, len, flags, &r);
+ if (!error) {
+ kref_get(&r->res_ref);
+ goto out;
+ }
+ error = search_rsb_list(&ls->ls_rsbtbl[b].toss, name, len, flags, &r);
+ if (error)
+ goto out;
+
+ 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;
+ } else if (r->res_nodeid > 0) {
+ rsb_set_flag(r, RSB_MASTER_UNCERTAIN);
+ r->res_first_lkid = 0;
+ } else {
+ DLM_ASSERT(r->res_nodeid == 0, dlm_print_rsb(r););
+ DLM_ASSERT(!rsb_flag(r, RSB_MASTER_UNCERTAIN),);
+ }
+ out:
+ *r_ret = r;
+ return error;
+}
+
+static int search_rsb(struct dlm_ls *ls, char *name, int len, int b,
+ unsigned int flags, struct dlm_rsb **r_ret)
+{
+ int error;
+ write_lock(&ls->ls_rsbtbl[b].lock);
+ error = _search_rsb(ls, name, len, b, flags, r_ret);
+ write_unlock(&ls->ls_rsbtbl[b].lock);
+ return error;
+}
+
+/*
+ * Find rsb in rsbtbl and potentially create/add one
+ *
+ * Delaying the release of rsb's has a similar benefit to applications keeping
+ * NL locks on an rsb, but without the guarantee that the cached master value
+ * will still be valid when the rsb is reused. Apps aren't always smart enough
+ * to keep NL locks on an rsb that they may lock again shortly; this can lead
+ * to excessive master lookups and removals if we don't delay the release.
+ *
+ * Searching for an rsb means looking through both the normal list and toss
+ * list. When found on the toss list the rsb is moved to the normal list with
+ * ref count of 1; when found on normal list the ref count is incremented.
+ */
+
+static int find_rsb(struct dlm_ls *ls, char *name, int namelen,
+ unsigned int flags, struct dlm_rsb **r_ret)
+{
+ struct dlm_rsb *r, *tmp;
+ uint32_t hash, bucket;
+ int error = 0;
+
+ if (dlm_no_directory(ls))
+ flags |= R_CREATE;
+
+ hash = jhash(name, namelen, 0);
+ bucket = hash & (ls->ls_rsbtbl_size - 1);
+
+ error = search_rsb(ls, name, namelen, bucket, flags, &r);
+ if (!error)
+ goto out;
+
+ if (error == -ENOENT && !(flags & R_CREATE))
+ goto out;
+
+ /* the rsb was found but wasn't a master copy */
+ if (error == -ENOTBLK)
+ goto out;
+
+ error = -ENOMEM;
+ r = create_rsb(ls, name, namelen);
+ 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) {
+ write_unlock(&ls->ls_rsbtbl[bucket].lock);
+ free_rsb(r);
+ r = tmp;
+ goto out;
+ }
+ list_add(&r->res_hashchain, &ls->ls_rsbtbl[bucket].list);
+ write_unlock(&ls->ls_rsbtbl[bucket].lock);
+ error = 0;
+ out:
+ *r_ret = r;
+ return error;
+}
+
+int dlm_find_rsb(struct dlm_ls *ls, char *name, int namelen,
+ unsigned int flags, struct dlm_rsb **r_ret)
+{
+ return find_rsb(ls, name, namelen, flags, r_ret);
+}
+
+/* This is only called to add a reference when the code already holds
+ a valid reference to the rsb, so there's no need for locking. */
+
+static inline void hold_rsb(struct dlm_rsb *r)
+{
+ kref_get(&r->res_ref);
+}
+
+void dlm_hold_rsb(struct dlm_rsb *r)
+{
+ hold_rsb(r);
+}
+
+static void toss_rsb(struct kref *kref)
+{
+ struct dlm_rsb *r = container_of(kref, struct dlm_rsb, res_ref);
+ struct dlm_ls *ls = r->res_ls;
+
+ DLM_ASSERT(list_empty(&r->res_root_list), dlm_print_rsb(r););
+ kref_init(&r->res_ref);
+ list_move(&r->res_hashchain, &ls->ls_rsbtbl[r->res_bucket].toss);
+ r->res_toss_time = jiffies;
+ if (r->res_lvbptr) {
+ free_lvb(r->res_lvbptr);
+ r->res_lvbptr = NULL;
+ }
+}
+
+/* When all references to the rsb are gone it's transfered to
+ the tossed list for later disposal. */
+
+static void put_rsb(struct dlm_rsb *r)
+{
+ struct dlm_ls *ls = r->res_ls;
+ uint32_t bucket = r->res_bucket;
+
+ write_lock(&ls->ls_rsbtbl[bucket].lock);
+ kref_put(&r->res_ref, toss_rsb);
+ write_unlock(&ls->ls_rsbtbl[bucket].lock);
+}
+
+void dlm_put_rsb(struct dlm_rsb *r)
+{
+ put_rsb(r);
+}
+
+/* See comment for unhold_lkb */
+
+static void unhold_rsb(struct dlm_rsb *r)
+{
+ int rv;
+ rv = kref_put(&r->res_ref, toss_rsb);
+ DLM_ASSERT(!rv, dlm_print_rsb(r););
+}
+
+static void kill_rsb(struct kref *kref)
+{
+ struct dlm_rsb *r = container_of(kref, struct dlm_rsb, res_ref);
+
+ /* All work is done after the return from kref_put() so we
+ can release the write_lock before the remove and free. */
+
+ DLM_ASSERT(list_empty(&r->res_lookup),);
+ DLM_ASSERT(list_empty(&r->res_grantqueue),);
+ DLM_ASSERT(list_empty(&r->res_convertqueue),);
+ DLM_ASSERT(list_empty(&r->res_waitqueue),);
+ DLM_ASSERT(list_empty(&r->res_root_list),);
+ DLM_ASSERT(list_empty(&r->res_recover_list),);
+}
+
+/* Attaching/detaching lkb's from rsb's is for rsb reference counting.
+ The rsb must exist as long as any lkb's for it do. */
+
+static void attach_lkb(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ hold_rsb(r);
+ lkb->lkb_resource = r;
+}
+
+static void detach_lkb(struct dlm_lkb *lkb)
+{
+ if (lkb->lkb_resource) {
+ put_rsb(lkb->lkb_resource);
+ lkb->lkb_resource = NULL;
+ }
+}
+
+static int create_lkb(struct dlm_ls *ls, struct dlm_lkb **lkb_ret)
+{
+ struct dlm_lkb *lkb, *tmp;
+ uint32_t lkid = 0;
+ uint16_t bucket;
+
+ lkb = allocate_lkb(ls);
+ if (!lkb)
+ return -ENOMEM;
+
+ lkb->lkb_nodeid = -1;
+ lkb->lkb_grmode = DLM_LOCK_IV;
+ kref_init(&lkb->lkb_ref);
+
+ get_random_bytes(&bucket, sizeof(bucket));
+ bucket &= (ls->ls_lkbtbl_size - 1);
+
+ write_lock(&ls->ls_lkbtbl[bucket].lock);
+
+ /* counter can roll over so we must verify lkid is not in use */
+
+ while (lkid == 0) {
+ lkid = bucket | (ls->ls_lkbtbl[bucket].counter++ << 16);
+
+ list_for_each_entry(tmp, &ls->ls_lkbtbl[bucket].list,
+ lkb_idtbl_list) {
+ if (tmp->lkb_id != lkid)
+ continue;
+ lkid = 0;
+ break;
+ }
+ }
+
+ lkb->lkb_id = lkid;
+ list_add(&lkb->lkb_idtbl_list, &ls->ls_lkbtbl[bucket].list);
+ write_unlock(&ls->ls_lkbtbl[bucket].lock);
+
+ *lkb_ret = lkb;
+ return 0;
+}
+
+static struct dlm_lkb *__find_lkb(struct dlm_ls *ls, uint32_t lkid)
+{
+ uint16_t bucket = lkid & 0xFFFF;
+ struct dlm_lkb *lkb;
+
+ list_for_each_entry(lkb, &ls->ls_lkbtbl[bucket].list, lkb_idtbl_list) {
+ if (lkb->lkb_id == lkid)
+ return lkb;
+ }
+ return NULL;
+}
+
+static int find_lkb(struct dlm_ls *ls, uint32_t lkid, struct dlm_lkb **lkb_ret)
+{
+ struct dlm_lkb *lkb;
+ uint16_t bucket = lkid & 0xFFFF;
+
+ if (bucket >= ls->ls_lkbtbl_size)
+ return -EBADSLT;
+
+ read_lock(&ls->ls_lkbtbl[bucket].lock);
+ lkb = __find_lkb(ls, lkid);
+ if (lkb)
+ kref_get(&lkb->lkb_ref);
+ read_unlock(&ls->ls_lkbtbl[bucket].lock);
+
+ *lkb_ret = lkb;
+ return lkb ? 0 : -ENOENT;
+}
+
+static void kill_lkb(struct kref *kref)
+{
+ struct dlm_lkb *lkb = container_of(kref, struct dlm_lkb, lkb_ref);
+
+ /* All work is done after the return from kref_put() so we
+ can release the write_lock before the detach_lkb */
+
+ DLM_ASSERT(!lkb->lkb_status, dlm_print_lkb(lkb););
+}
+
+static int put_lkb(struct dlm_lkb *lkb)
+{
+ struct dlm_ls *ls = lkb->lkb_resource->res_ls;
+ uint16_t bucket = lkb->lkb_id & 0xFFFF;
+
+ write_lock(&ls->ls_lkbtbl[bucket].lock);
+ if (kref_put(&lkb->lkb_ref, kill_lkb)) {
+ list_del(&lkb->lkb_idtbl_list);
+ write_unlock(&ls->ls_lkbtbl[bucket].lock);
+
+ detach_lkb(lkb);
+
+ /* for local/process lkbs, lvbptr points to caller's lksb */
+ if (lkb->lkb_lvbptr && is_master_copy(lkb))
+ free_lvb(lkb->lkb_lvbptr);
+ if (lkb->lkb_range)
+ free_range(lkb->lkb_range);
+ free_lkb(lkb);
+ return 1;
+ } else {
+ write_unlock(&ls->ls_lkbtbl[bucket].lock);
+ return 0;
+ }
+}
+
+int dlm_put_lkb(struct dlm_lkb *lkb)
+{
+ return put_lkb(lkb);
+}
+
+/* This is only called to add a reference when the code already holds
+ a valid reference to the lkb, so there's no need for locking. */
+
+static inline void hold_lkb(struct dlm_lkb *lkb)
+{
+ kref_get(&lkb->lkb_ref);
+}
+
+/* This is called when we need to remove a reference and are certain
+ it's not the last ref. e.g. del_lkb is always called between a
+ find_lkb/put_lkb and is always the inverse of a previous add_lkb.
+ put_lkb would work fine, but would involve unnecessary locking */
+
+static inline void unhold_lkb(struct dlm_lkb *lkb)
+{
+ int rv;
+ rv = kref_put(&lkb->lkb_ref, kill_lkb);
+ DLM_ASSERT(!rv, dlm_print_lkb(lkb););
+}
+
+static void lkb_add_ordered(struct list_head *new, struct list_head *head,
+ int mode)
+{
+ struct dlm_lkb *lkb = NULL;
+
+ list_for_each_entry(lkb, head, lkb_statequeue)
+ if (lkb->lkb_rqmode < mode)
+ break;
+
+ if (!lkb)
+ list_add_tail(new, head);
+ else
+ __list_add(new, lkb->lkb_statequeue.prev, &lkb->lkb_statequeue);
+}
+
+/* add/remove lkb to rsb's grant/convert/wait queue */
+
+static void add_lkb(struct dlm_rsb *r, struct dlm_lkb *lkb, int status)
+{
+ kref_get(&lkb->lkb_ref);
+
+ DLM_ASSERT(!lkb->lkb_status, dlm_print_lkb(lkb););
+
+ lkb->lkb_status = status;
+
+ switch (status) {
+ case DLM_LKSTS_WAITING:
+ if (lkb->lkb_exflags & DLM_LKF_HEADQUE)
+ list_add(&lkb->lkb_statequeue, &r->res_waitqueue);
+ else
+ list_add_tail(&lkb->lkb_statequeue, &r->res_waitqueue);
+ break;
+ case DLM_LKSTS_GRANTED:
+ /* convention says granted locks kept in order of grmode */
+ lkb_add_ordered(&lkb->lkb_statequeue, &r->res_grantqueue,
+ lkb->lkb_grmode);
+ break;
+ case DLM_LKSTS_CONVERT:
+ if (lkb->lkb_exflags & DLM_LKF_HEADQUE)
+ list_add(&lkb->lkb_statequeue, &r->res_convertqueue);
+ else
+ list_add_tail(&lkb->lkb_statequeue,
+ &r->res_convertqueue);
+ break;
+ default:
+ DLM_ASSERT(0, dlm_print_lkb(lkb); printk("sts=%d\n", status););
+ }
+}
+
+static void del_lkb(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ lkb->lkb_status = 0;
+ list_del(&lkb->lkb_statequeue);
+ unhold_lkb(lkb);
+}
+
+static void move_lkb(struct dlm_rsb *r, struct dlm_lkb *lkb, int sts)
+{
+ hold_lkb(lkb);
+ del_lkb(r, lkb);
+ add_lkb(r, lkb, sts);
+ unhold_lkb(lkb);
+}
+
+/* add/remove lkb from global waiters list of lkb's waiting for
+ a reply from a remote node */
+
+static void add_to_waiters(struct dlm_lkb *lkb, int mstype)
+{
+ struct dlm_ls *ls = lkb->lkb_resource->res_ls;
+
+ down(&ls->ls_waiters_sem);
+ if (lkb->lkb_wait_type) {
+ log_print("add_to_waiters error %d", lkb->lkb_wait_type);
+ goto out;
+ }
+ lkb->lkb_wait_type = mstype;
+ kref_get(&lkb->lkb_ref);
+ list_add(&lkb->lkb_wait_reply, &ls->ls_waiters);
+ out:
+ up(&ls->ls_waiters_sem);
+}
+
+static int _remove_from_waiters(struct dlm_lkb *lkb)
+{
+ int error = 0;
+
+ if (!lkb->lkb_wait_type) {
+ log_print("remove_from_waiters error");
+ error = -EINVAL;
+ goto out;
+ }
+ lkb->lkb_wait_type = 0;
+ list_del(&lkb->lkb_wait_reply);
+ unhold_lkb(lkb);
+ out:
+ return error;
+}
+
+static int remove_from_waiters(struct dlm_lkb *lkb)
+{
+ struct dlm_ls *ls = lkb->lkb_resource->res_ls;
+ int error;
+
+ down(&ls->ls_waiters_sem);
+ error = _remove_from_waiters(lkb);
+ up(&ls->ls_waiters_sem);
+ return error;
+}
+
+static void dir_remove(struct dlm_rsb *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
+ dlm_dir_remove_entry(r->res_ls, to_nodeid,
+ r->res_name, r->res_length);
+}
+
+/* FIXME: shouldn't this be able to exit as soon as one non-due rsb is
+ found since they are in order of newest to oldest? */
+
+static int shrink_bucket(struct dlm_ls *ls, int b)
+{
+ struct dlm_rsb *r;
+ int count = 0, found;
+
+ for (;;) {
+ found = FALSE;
+ write_lock(&ls->ls_rsbtbl[b].lock);
+ list_for_each_entry_reverse(r, &ls->ls_rsbtbl[b].toss,
+ res_hashchain) {
+ if (!time_after_eq(jiffies, r->res_toss_time +
+ dlm_config.toss_secs * HZ))
+ continue;
+ found = TRUE;
+ break;
+ }
+
+ if (!found) {
+ write_unlock(&ls->ls_rsbtbl[b].lock);
+ break;
+ }
+
+ if (kref_put(&r->res_ref, kill_rsb)) {
+ list_del(&r->res_hashchain);
+ write_unlock(&ls->ls_rsbtbl[b].lock);
+
+ if (is_master(r))
+ dir_remove(r);
+ free_rsb(r);
+ count++;
+ } else {
+ write_unlock(&ls->ls_rsbtbl[b].lock);
+ log_error(ls, "tossed rsb in use %s", r->res_name);
+ }
+ }
+
+ return count;
+}
+
+void dlm_scan_rsbs(struct dlm_ls *ls)
+{
+ int i;
+
+ if (dlm_locking_stopped(ls))
+ return;
+
+ for (i = 0; i < ls->ls_rsbtbl_size; i++) {
+ shrink_bucket(ls, i);
+ cond_resched();
+ }
+}
+
+/* lkb is master or local copy */
+
+static void set_lvb_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ int b, len = r->res_ls->ls_lvblen;
+
+ /* b=1 lvb returned to caller
+ b=0 lvb written to rsb or invalidated
+ b=-1 do nothing */
+
+ b = dlm_lvb_operations[lkb->lkb_grmode + 1][lkb->lkb_rqmode + 1];
+
+ if (b == 1) {
+ if (!lkb->lkb_lvbptr)
+ return;
+
+ if (!(lkb->lkb_exflags & DLM_LKF_VALBLK))
+ return;
+
+ if (!r->res_lvbptr)
+ return;
+
+ memcpy(lkb->lkb_lvbptr, r->res_lvbptr, len);
+ lkb->lkb_lvbseq = r->res_lvbseq;
+
+ } else if (b == 0) {
+ if (lkb->lkb_exflags & DLM_LKF_IVVALBLK) {
+ rsb_set_flag(r, RSB_VALNOTVALID);
+ return;
+ }
+
+ if (!lkb->lkb_lvbptr)
+ return;
+
+ if (!(lkb->lkb_exflags & DLM_LKF_VALBLK))
+ return;
+
+ if (!r->res_lvbptr)
+ r->res_lvbptr = allocate_lvb(r->res_ls);
+
+ if (!r->res_lvbptr)
+ return;
+
+ memcpy(r->res_lvbptr, lkb->lkb_lvbptr, len);
+ r->res_lvbseq++;
+ lkb->lkb_lvbseq = r->res_lvbseq;
+ rsb_clear_flag(r, RSB_VALNOTVALID);
+ }
+
+ if (rsb_flag(r, RSB_VALNOTVALID))
+ lkb->lkb_sbflags |= DLM_SBF_VALNOTVALID;
+}
+
+static void set_lvb_unlock(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ if (lkb->lkb_grmode < DLM_LOCK_PW)
+ return;
+
+ if (lkb->lkb_exflags & DLM_LKF_IVVALBLK) {
+ rsb_set_flag(r, RSB_VALNOTVALID);
+ return;
+ }
+
+ if (!lkb->lkb_lvbptr)
+ return;
+
+ if (!(lkb->lkb_exflags & DLM_LKF_VALBLK))
+ return;
+
+ if (!r->res_lvbptr)
+ r->res_lvbptr = allocate_lvb(r->res_ls);
+
+ if (!r->res_lvbptr)
+ return;
+
+ memcpy(r->res_lvbptr, lkb->lkb_lvbptr, r->res_ls->ls_lvblen);
+ r->res_lvbseq++;
+ rsb_clear_flag(r, RSB_VALNOTVALID);
+}
+
+/* lkb is process copy (pc) */
+
+static void set_lvb_lock_pc(struct dlm_rsb *r, struct dlm_lkb *lkb,
+ struct dlm_message *ms)
+{
+ int b;
+
+ if (!lkb->lkb_lvbptr)
+ return;
+
+ if (!(lkb->lkb_exflags & DLM_LKF_VALBLK))
+ return;
+
+ b = dlm_lvb_operations[lkb->lkb_grmode + 1][lkb->lkb_rqmode + 1];
+ if (b == 1) {
+ int len = receive_extralen(ms);
+ memcpy(lkb->lkb_lvbptr, ms->m_extra, len);
+ lkb->lkb_lvbseq = ms->m_lvbseq;
+ }
+}
+
+/* Manipulate lkb's on rsb's convert/granted/waiting queues
+ remove_lock -- used for unlock, removes lkb from granted
+ revert_lock -- used for cancel, moves lkb from convert to granted
+ grant_lock -- used for request and convert, adds lkb to granted or
+ moves lkb from convert or waiting to granted
+
+ Each of these is used for master or local copy lkb's. There is
+ also a _pc() variation used to make the corresponding change on
+ a process copy (pc) lkb. */
+
+static void _remove_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ del_lkb(r, lkb);
+ lkb->lkb_grmode = DLM_LOCK_IV;
+ /* this unhold undoes the original ref from create_lkb()
+ so this leads to the lkb being freed */
+ unhold_lkb(lkb);
+}
+
+static void remove_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ set_lvb_unlock(r, lkb);
+ _remove_lock(r, lkb);
+}
+
+static void remove_lock_pc(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ _remove_lock(r, lkb);
+}
+
+static void revert_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ lkb->lkb_rqmode = DLM_LOCK_IV;
+
+ switch (lkb->lkb_status) {
+ case DLM_LKSTS_CONVERT:
+ move_lkb(r, lkb, DLM_LKSTS_GRANTED);
+ break;
+ case DLM_LKSTS_WAITING:
+ del_lkb(r, lkb);
+ lkb->lkb_grmode = DLM_LOCK_IV;
+ /* this unhold undoes the original ref from create_lkb()
+ so this leads to the lkb being freed */
+ unhold_lkb(lkb);
+ break;
+ default:
+ log_print("invalid status for revert %d", lkb->lkb_status);
+ }
+}
+
+static void revert_lock_pc(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ revert_lock(r, lkb);
+}
+
+static void _grant_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ if (lkb->lkb_grmode != lkb->lkb_rqmode) {
+ lkb->lkb_grmode = lkb->lkb_rqmode;
+ if (lkb->lkb_status)
+ move_lkb(r, lkb, DLM_LKSTS_GRANTED);
+ else
+ add_lkb(r, lkb, DLM_LKSTS_GRANTED);
+ }
+
+ lkb->lkb_rqmode = DLM_LOCK_IV;
+
+ if (lkb->lkb_range) {
+ lkb->lkb_range[GR_RANGE_START] = lkb->lkb_range[RQ_RANGE_START];
+ lkb->lkb_range[GR_RANGE_END] = lkb->lkb_range[RQ_RANGE_END];
+ }
+}
+
+static void grant_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ set_lvb_lock(r, lkb);
+ _grant_lock(r, lkb);
+ lkb->lkb_highbast = 0;
+}
+
+static void grant_lock_pc(struct dlm_rsb *r, struct dlm_lkb *lkb,
+ struct dlm_message *ms)
+{
+ set_lvb_lock_pc(r, lkb, ms);
+ _grant_lock(r, lkb);
+}
+
+/* called by grant_pending_locks() which means an async grant message must
+ be sent to the requesting node in addition to granting the lock if the
+ lkb belongs to a remote node. */
+
+static void grant_lock_pending(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ grant_lock(r, lkb);
+ if (is_master_copy(lkb))
+ send_grant(r, lkb);
+ else
+ queue_cast(r, lkb, 0);
+}
+
+static inline int first_in_list(struct dlm_lkb *lkb, struct list_head *head)
+{
+ struct dlm_lkb *first = list_entry(head->next, struct dlm_lkb,
+ lkb_statequeue);
+ if (lkb->lkb_id == first->lkb_id)
+ return TRUE;
+
+ return FALSE;
+}
+
+/* Return 1 if the locks' ranges overlap. If the lkb has no range then it is
+ assumed to cover 0-ffffffff.ffffffff */
+
+static inline int ranges_overlap(struct dlm_lkb *lkb1, struct dlm_lkb *lkb2)
+{
+ if (!lkb1->lkb_range || !lkb2->lkb_range)
+ return TRUE;
+
+ if (lkb1->lkb_range[RQ_RANGE_END] < lkb2->lkb_range[GR_RANGE_START] ||
+ lkb1->lkb_range[RQ_RANGE_START] > lkb2->lkb_range[GR_RANGE_END])
+ return FALSE;
+
+ return TRUE;
+}
+
+/* Check if the given lkb conflicts with another lkb on the queue. */
+
+static int queue_conflict(struct list_head *head, struct dlm_lkb *lkb)
+{
+ struct dlm_lkb *this;
+
+ list_for_each_entry(this, head, lkb_statequeue) {
+ if (this == lkb)
+ continue;
+ if (ranges_overlap(lkb, this) && !modes_compat(this, lkb))
+ return TRUE;
+ }
+ return FALSE;
+}
+
+/*
+ * "A conversion deadlock arises with a pair of lock requests in the converting
+ * queue for one resource. The granted mode of each lock blocks the requested
+ * mode of the other lock."
+ *
+ * Part 2: if the granted mode of lkb is preventing the first lkb in the
+ * convert queue from being granted, then demote lkb (set grmode to NL).
+ * This second form requires that we check for conv-deadlk even when
+ * now == 0 in _can_be_granted().
+ *
+ * Example:
+ * Granted Queue: empty
+ * Convert Queue: NL->EX (first lock)
+ * PR->EX (second lock)
+ *
+ * The first lock can't be granted because of the granted mode of the second
+ * lock and the second lock can't be granted because it's not first in the
+ * list. We demote the granted mode of the second lock (the lkb passed to this
+ * function).
+ *
+ * After the resolution, the "grant pending" function needs to go back and try
+ * to grant locks on the convert queue again since the first lock can now be
+ * granted.
+ */
+
+static int conversion_deadlock_detect(struct dlm_rsb *rsb, struct dlm_lkb *lkb)
+{
+ struct dlm_lkb *this, *first = NULL, *self = NULL;
+
+ list_for_each_entry(this, &rsb->res_convertqueue, lkb_statequeue) {
+ if (!first)
+ first = this;
+ if (this == lkb) {
+ self = lkb;
+ continue;
+ }
+
+ if (!ranges_overlap(lkb, this))
+ continue;
+
+ if (!modes_compat(this, lkb) && !modes_compat(lkb, this))
+ return TRUE;
+ }
+
+ /* if lkb is on the convert queue and is preventing the first
+ from being granted, then there's deadlock and we demote lkb.
+ multiple converting locks may need to do this before the first
+ converting lock can be granted. */
+
+ if (self && self != first) {
+ if (!modes_compat(lkb, first) &&
+ !queue_conflict(&rsb->res_grantqueue, first))
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+/*
+ * Return 1 if the lock can be granted, 0 otherwise.
+ * Also detect and resolve conversion deadlocks.
+ *
+ * lkb is the lock to be granted
+ *
+ * now is 1 if the function is being called in the context of the
+ * immediate request, it is 0 if called later, after the lock has been
+ * queued.
+ *
+ * References are from chapter 6 of "VAXcluster Principles" by Roy Davis
+ */
+
+static int _can_be_granted(struct dlm_rsb *r, struct dlm_lkb *lkb, int now)
+{
+ int8_t conv = (lkb->lkb_grmode != DLM_LOCK_IV);
+
+ /*
+ * 6-10: Version 5.4 introduced an option to address the phenomenon of
+ * a new request for a NL mode lock being blocked.
+ *
+ * 6-11: If the optional EXPEDITE flag is used with the new NL mode
+ * request, then it would be granted. In essence, the use of this flag
+ * tells the Lock Manager to expedite theis request by not considering
+ * what may be in the CONVERTING or WAITING queues... As of this
+ * writing, the EXPEDITE flag can be used only with new requests for NL
+ * mode locks. This flag is not valid for conversion requests.
+ *
+ * A shortcut. Earlier checks return an error if EXPEDITE is used in a
+ * conversion or used with a non-NL requested mode. We also know an
+ * EXPEDITE request is always granted immediately, so now must always
+ * be 1. The full condition to grant an expedite request: (now &&
+ * !conv && lkb->rqmode == DLM_LOCK_NL && (flags & EXPEDITE)) can
+ * therefore be shortened to just checking the flag.
+ */
+
+ if (lkb->lkb_exflags & DLM_LKF_EXPEDITE)
+ return TRUE;
+
+ /*
+ * A shortcut. Without this, !queue_conflict(grantqueue, lkb) would be
+ * added to the remaining conditions.
+ */
+
+ if (queue_conflict(&r->res_grantqueue, lkb))
+ goto out;
+
+ /*
+ * 6-3: By default, a conversion request is immediately granted if the
+ * requested mode is compatible with the modes of all other granted
+ * locks
+ */
+
+ if (queue_conflict(&r->res_convertqueue, lkb))
+ goto out;
+
+ /*
+ * 6-5: But the default algorithm for deciding whether to grant or
+ * queue conversion requests does not by itself guarantee that such
+ * requests are serviced on a "first come first serve" basis. This, in
+ * turn, can lead to a phenomenon known as "indefinate postponement".
+ *
+ * 6-7: This issue is dealt with by using the optional QUECVT flag with
+ * the system service employed to request a lock conversion. This flag
+ * forces certain conversion requests to be queued, even if they are
+ * compatible with the granted modes of other locks on the same
+ * resource. Thus, the use of this flag results in conversion requests
+ * being ordered on a "first come first servce" basis.
+ *
+ * DCT: This condition is all about new conversions being able to occur
+ * "in place" while the lock remains on the granted queue (assuming
+ * nothing else conflicts.) IOW if QUECVT isn't set, a conversion
+ * doesn't _have_ to go onto the convert queue where it's processed in
+ * order. The "now" variable is necessary to distinguish converts
+ * being received and processed for the first time now, because once a
+ * convert is moved to the conversion queue the condition below applies
+ * requiring fifo granting.
+ */
+
+ if (now && conv && !(lkb->lkb_exflags & DLM_LKF_QUECVT))
+ return TRUE;
+
+ /*
+ * When using range locks the NOORDER flag is set to avoid the standard
+ * vms rules on grant order.
+ */
+
+ if (lkb->lkb_exflags & DLM_LKF_NOORDER)
+ return TRUE;
+
+ /*
+ * 6-3: Once in that queue [CONVERTING], a conversion request cannot be
+ * granted until all other conversion requests ahead of it are granted
+ * and/or canceled.
+ */
+
+ if (!now && conv && first_in_list(lkb, &r->res_convertqueue))
+ return TRUE;
+
+ /*
+ * 6-4: By default, a new request is immediately granted only if all
+ * three of the following conditions are satisfied when the request is
+ * issued:
+ * - The queue of ungranted conversion requests for the resource is
+ * empty.
+ * - The queue of ungranted new requests for the resource is empty.
+ * - The mode of the new request is compatible with the most
+ * restrictive mode of all granted locks on the resource.
+ */
+
+ if (now && !conv && list_empty(&r->res_convertqueue) &&
+ list_empty(&r->res_waitqueue))
+ return TRUE;
+
+ /*
+ * 6-4: Once a lock request is in the queue of ungranted new requests,
+ * it cannot be granted until the queue of ungranted conversion
+ * requests is empty, all ungranted new requests ahead of it are
+ * granted and/or canceled, and it is compatible with the granted mode
+ * of the most restrictive lock granted on the resource.
+ */
+
+ if (!now && !conv && list_empty(&r->res_convertqueue) &&
+ first_in_list(lkb, &r->res_waitqueue))
+ return TRUE;
+
+ out:
+ /*
+ * The following, enabled by CONVDEADLK, departs from VMS.
+ */
+
+ if (conv && (lkb->lkb_exflags & DLM_LKF_CONVDEADLK) &&
+ conversion_deadlock_detect(r, lkb)) {
+ lkb->lkb_grmode = DLM_LOCK_NL;
+ lkb->lkb_sbflags |= DLM_SBF_DEMOTED;
+ }
+
+ return FALSE;
+}
+
+/*
+ * The ALTPR and ALTCW flags aren't traditional lock manager flags, but are a
+ * simple way to provide a big optimization to applications that can use them.
+ */
+
+static int can_be_granted(struct dlm_rsb *r, struct dlm_lkb *lkb, int now)
+{
+ uint32_t flags = lkb->lkb_exflags;
+ int rv;
+ int8_t alt = 0, rqmode = lkb->lkb_rqmode;
+
+ rv = _can_be_granted(r, lkb, now);
+ if (rv)
+ goto out;
+
+ if (lkb->lkb_sbflags & DLM_SBF_DEMOTED)
+ goto out;
+
+ if (rqmode != DLM_LOCK_PR && flags & DLM_LKF_ALTPR)
+ alt = DLM_LOCK_PR;
+ else if (rqmode != DLM_LOCK_CW && flags & DLM_LKF_ALTCW)
+ alt = DLM_LOCK_CW;
+
+ if (alt) {
+ lkb->lkb_rqmode = alt;
+ rv = _can_be_granted(r, lkb, now);
+ if (rv)
+ lkb->lkb_sbflags |= DLM_SBF_ALTMODE;
+ else
+ lkb->lkb_rqmode = rqmode;
+ }
+ out:
+ return rv;
+}
+
+static int grant_pending_convert(struct dlm_rsb *r, int high)
+{
+ struct dlm_lkb *lkb, *s;
+ int hi, demoted, quit, grant_restart, demote_restart;
+
+ quit = 0;
+ restart:
+ grant_restart = 0;
+ demote_restart = 0;
+ hi = DLM_LOCK_IV;
+
+ list_for_each_entry_safe(lkb, s, &r->res_convertqueue, lkb_statequeue) {
+ demoted = is_demoted(lkb);
+ if (can_be_granted(r, lkb, FALSE)) {
+ grant_lock_pending(r, lkb);
+ grant_restart = 1;
+ } else {
+ hi = max_t(int, lkb->lkb_rqmode, hi);
+ if (!demoted && is_demoted(lkb))
+ demote_restart = 1;
+ }
+ }
+
+ if (grant_restart)
+ goto restart;
+ if (demote_restart && !quit) {
+ quit = 1;
+ goto restart;
+ }
+
+ return max_t(int, high, hi);
+}
+
+static int grant_pending_wait(struct dlm_rsb *r, int high)
+{
+ struct dlm_lkb *lkb, *s;
+
+ list_for_each_entry_safe(lkb, s, &r->res_waitqueue, lkb_statequeue) {
+ if (can_be_granted(r, lkb, FALSE))
+ grant_lock_pending(r, lkb);
+ else
+ high = max_t(int, lkb->lkb_rqmode, high);
+ }
+
+ return high;
+}
+
+static void grant_pending_locks(struct dlm_rsb *r)
+{
+ struct dlm_lkb *lkb, *s;
+ int high = DLM_LOCK_IV;
+
+ DLM_ASSERT(is_master(r), dlm_print_rsb(r););
+
+ high = grant_pending_convert(r, high);
+ high = grant_pending_wait(r, high);
+
+ if (high == DLM_LOCK_IV)
+ return;
+
+ /*
+ * If there are locks left on the wait/convert queue then send blocking
+ * ASTs to granted locks based on the largest requested mode (high)
+ * found above. This can generate spurious blocking ASTs for range
+ * locks. FIXME: highbast < high comparison not valid for PR/CW.
+ */
+
+ list_for_each_entry_safe(lkb, s, &r->res_grantqueue, lkb_statequeue) {
+ if (lkb->lkb_bastaddr && (lkb->lkb_highbast < high) &&
+ !__dlm_compat_matrix[lkb->lkb_grmode+1][high+1]) {
+ queue_bast(r, lkb, high);
+ lkb->lkb_highbast = high;
+ }
+ }
+}
+
+static void send_bast_queue(struct dlm_rsb *r, struct list_head *head,
+ struct dlm_lkb *lkb)
+{
+ struct dlm_lkb *gr;
+
+ list_for_each_entry(gr, head, lkb_statequeue) {
+ if (gr->lkb_bastaddr &&
+ gr->lkb_highbast < lkb->lkb_rqmode &&
+ ranges_overlap(lkb, gr) && !modes_compat(gr, lkb)) {
+ queue_bast(r, gr, lkb->lkb_rqmode);
+ gr->lkb_highbast = lkb->lkb_rqmode;
+ }
+ }
+}
+
+static void send_blocking_asts(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ send_bast_queue(r, &r->res_grantqueue, lkb);
+}
+
+static void send_blocking_asts_all(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ send_bast_queue(r, &r->res_grantqueue, lkb);
+ send_bast_queue(r, &r->res_convertqueue, lkb);
+}
+
+/* set_master(r, lkb) -- set the master nodeid of a resource
+
+ The purpose of this function is to set the nodeid field in the given
+ lkb using the nodeid field in the given rsb. If the rsb's nodeid is
+ known, it can just be copied to the lkb and the function will return
+ 0. If the rsb's nodeid is _not_ known, it needs to be looked up
+ before it can be copied to the lkb.
+
+ When the rsb nodeid is being looked up remotely, the initial lkb
+ causing the lookup is kept on the ls_waiters list waiting for the
+ lookup reply. Other lkb's waiting for the same rsb lookup are kept
+ on the rsb's res_lookup list until the master is verified.
+
+ Return values:
+ 0: nodeid is set in rsb/lkb and the caller should go ahead and use it
+ 1: the rsb master is not available and the lkb has been placed on
+ a wait queue
+*/
+
+static int set_master(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ struct dlm_ls *ls = r->res_ls;
+ int error, dir_nodeid, ret_nodeid, our_nodeid = dlm_our_nodeid();
+
+ if (rsb_flag(r, RSB_MASTER_UNCERTAIN)) {
+ rsb_clear_flag(r, RSB_MASTER_UNCERTAIN);
+ r->res_first_lkid = lkb->lkb_id;
+ lkb->lkb_nodeid = r->res_nodeid;
+ return 0;
+ }
+
+ if (r->res_first_lkid && r->res_first_lkid != lkb->lkb_id) {
+ list_add_tail(&lkb->lkb_rsb_lookup, &r->res_lookup);
+ return 1;
+ }
+
+ if (r->res_nodeid == 0) {
+ lkb->lkb_nodeid = 0;
+ return 0;
+ }
+
+ if (r->res_nodeid > 0) {
+ lkb->lkb_nodeid = r->res_nodeid;
+ return 0;
+ }
+
+ DLM_ASSERT(r->res_nodeid == -1, dlm_print_rsb(r););
+
+ dir_nodeid = dlm_dir_nodeid(r);
+
+ if (dir_nodeid != our_nodeid) {
+ r->res_first_lkid = lkb->lkb_id;
+ send_lookup(r, lkb);
+ return 1;
+ }
+
+ for (;;) {
+ /* It's possible for dlm_scand to remove an old rsb for
+ this same resource from the toss list, us to create
+ a new one, look up the master locally, and find it
+ already exists just before dlm_scand does the
+ dir_remove() on the previous rsb. */
+
+ error = dlm_dir_lookup(ls, our_nodeid, r->res_name,
+ r->res_length, &ret_nodeid);
+ if (!error)
+ break;
+ log_debug(ls, "dir_lookup error %d %s", error, r->res_name);
+ schedule();
+ }
+
+ if (ret_nodeid == our_nodeid) {
+ r->res_first_lkid = 0;
+ r->res_nodeid = 0;
+ lkb->lkb_nodeid = 0;
+ } else {
+ r->res_first_lkid = lkb->lkb_id;
+ r->res_nodeid = ret_nodeid;
+ lkb->lkb_nodeid = ret_nodeid;
+ }
+ return 0;
+}
+
+static void process_lookup_list(struct dlm_rsb *r)
+{
+ struct dlm_lkb *lkb, *safe;
+
+ list_for_each_entry_safe(lkb, safe, &r->res_lookup, lkb_rsb_lookup) {
+ list_del(&lkb->lkb_rsb_lookup);
+ _request_lock(r, lkb);
+ schedule();
+ }
+}
+
+/* confirm_master -- confirm (or deny) an rsb's master nodeid */
+
+static void confirm_master(struct dlm_rsb *r, int error)
+{
+ struct dlm_lkb *lkb;
+
+ if (!r->res_first_lkid)
+ return;
+
+ switch (error) {
+ case 0:
+ case -EINPROGRESS:
+ r->res_first_lkid = 0;
+ process_lookup_list(r);
+ break;
+
+ case -EAGAIN:
+ /* the remote master didn't queue our NOQUEUE request;
+ make a waiting lkb the first_lkid */
+
+ r->res_first_lkid = 0;
+
+ if (!list_empty(&r->res_lookup)) {
+ lkb = list_entry(r->res_lookup.next, struct dlm_lkb,
+ lkb_rsb_lookup);
+ list_del(&lkb->lkb_rsb_lookup);
+ r->res_first_lkid = lkb->lkb_id;
+ _request_lock(r, lkb);
+ } else
+ r->res_nodeid = -1;
+ break;
+
+ default:
+ log_error(r->res_ls, "confirm_master unknown error %d", error);
+ }
+}
+
+static int set_lock_args(int mode, struct dlm_lksb *lksb, uint32_t flags,
+ int namelen, uint32_t parent_lkid, void *ast,
+ void *astarg, void *bast, struct dlm_range *range,
+ struct dlm_args *args)
+{
+ int rv = -EINVAL;
+
+ /* check for invalid arg usage */
+
+ if (mode < 0 || mode > DLM_LOCK_EX)
+ goto out;
+
+ if (!(flags & DLM_LKF_CONVERT) && (namelen > DLM_RESNAME_MAXLEN))
+ goto out;
+
+ if (flags & DLM_LKF_CANCEL)
+ goto out;
+
+ if (flags & DLM_LKF_QUECVT && !(flags & DLM_LKF_CONVERT))
+ goto out;
+
+ if (flags & DLM_LKF_CONVDEADLK && !(flags & DLM_LKF_CONVERT))
+ goto out;
+
+ if (flags & DLM_LKF_CONVDEADLK && flags & DLM_LKF_NOQUEUE)
+ goto out;
+
+ if (flags & DLM_LKF_EXPEDITE && flags & DLM_LKF_CONVERT)
+ goto out;
+
+ if (flags & DLM_LKF_EXPEDITE && flags & DLM_LKF_QUECVT)
+ goto out;
+
+ if (flags & DLM_LKF_EXPEDITE && flags & DLM_LKF_NOQUEUE)
+ goto out;
+
+ if (flags & DLM_LKF_EXPEDITE && mode != DLM_LOCK_NL)
+ goto out;
+
+ if (!ast || !lksb)
+ goto out;
+
+ if (flags & DLM_LKF_VALBLK && !lksb->sb_lvbptr)
+ goto out;
+
+ /* parent/child locks not yet supported */
+ if (parent_lkid)
+ goto out;
+
+ if (flags & DLM_LKF_CONVERT && !lksb->sb_lkid)
+ goto out;
+
+ /* these args will be copied to the lkb in validate_lock_args,
+ it cannot be done now because when converting locks, fields in
+ an active lkb cannot be modified before locking the rsb */
+
+ args->flags = flags;
+ args->astaddr = ast;
+ args->astparam = (long) astarg;
+ args->bastaddr = bast;
+ args->mode = mode;
+ args->lksb = lksb;
+ args->range = range;
+ rv = 0;
+ out:
+ return rv;
+}
+
+static int set_unlock_args(uint32_t flags, void *astarg, struct dlm_args *args)
+{
+ if (flags & ~(DLM_LKF_CANCEL | DLM_LKF_VALBLK | DLM_LKF_IVVALBLK |
+ DLM_LKF_FORCEUNLOCK))
+ return -EINVAL;
+
+ args->flags = flags;
+ args->astparam = (long) astarg;
+ return 0;
+}
+
+static int validate_lock_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
+ struct dlm_args *args)
+{
+ int rv = -EINVAL;
+
+ if (args->flags & DLM_LKF_CONVERT) {
+ if (lkb->lkb_flags & DLM_IFL_MSTCPY)
+ goto out;
+
+ if (args->flags & DLM_LKF_QUECVT &&
+ !__quecvt_compat_matrix[lkb->lkb_grmode+1][args->mode+1])
+ goto out;
+
+ rv = -EBUSY;
+ if (lkb->lkb_status != DLM_LKSTS_GRANTED)
+ goto out;
+
+ if (lkb->lkb_wait_type)
+ goto out;
+ }
+
+ lkb->lkb_exflags = args->flags;
+ lkb->lkb_sbflags = 0;
+ lkb->lkb_astaddr = args->astaddr;
+ lkb->lkb_astparam = args->astparam;
+ lkb->lkb_bastaddr = args->bastaddr;
+ lkb->lkb_rqmode = args->mode;
+ lkb->lkb_lksb = args->lksb;
+ lkb->lkb_lvbptr = args->lksb->sb_lvbptr;
+ lkb->lkb_ownpid = (int) current->pid;
+
+ rv = 0;
+ if (!args->range)
+ goto out;
+
+ if (!lkb->lkb_range) {
+ rv = -ENOMEM;
+ lkb->lkb_range = allocate_range(ls);
+ if (!lkb->lkb_range)
+ goto out;
+ /* This is needed for conversions that contain ranges
+ where the original lock didn't but it's harmless for
+ new locks too. */
+ lkb->lkb_range[GR_RANGE_START] = 0LL;
+ lkb->lkb_range[GR_RANGE_END] = 0xffffffffffffffffULL;
+ }
+
+ lkb->lkb_range[RQ_RANGE_START] = args->range->ra_start;
+ lkb->lkb_range[RQ_RANGE_END] = args->range->ra_end;
+ lkb->lkb_flags |= DLM_IFL_RANGE;
+ rv = 0;
+ out:
+ return rv;
+}
+
+static int validate_unlock_args(struct dlm_lkb *lkb, struct dlm_args *args)
+{
+ int rv = -EINVAL;
+
+ if (lkb->lkb_flags & DLM_IFL_MSTCPY)
+ goto out;
+
+ if (args->flags & DLM_LKF_FORCEUNLOCK)
+ goto out_ok;
+
+ if (args->flags & DLM_LKF_CANCEL &&
+ lkb->lkb_status == DLM_LKSTS_GRANTED)
+ goto out;
+
+ if (!(args->flags & DLM_LKF_CANCEL) &&
+ lkb->lkb_status != DLM_LKSTS_GRANTED)
+ goto out;
+
+ rv = -EBUSY;
+ if (lkb->lkb_wait_type)
+ goto out;
+
+ out_ok:
+ lkb->lkb_exflags = args->flags;
+ lkb->lkb_sbflags = 0;
+ lkb->lkb_astparam = args->astparam;
+
+ rv = 0;
+ out:
+ return rv;
+}
+
+/*
+ * Four stage 4 varieties:
+ * do_request(), do_convert(), do_unlock(), do_cancel()
+ * These are called on the master node for the given lock and
+ * from the central locking logic.
+ */
+
+static int do_request(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ int error = 0;
+
+ if (can_be_granted(r, lkb, TRUE)) {
+ grant_lock(r, lkb);
+ queue_cast(r, lkb, 0);
+ goto out;
+ }
+
+ if (can_be_queued(lkb)) {
+ error = -EINPROGRESS;
+ add_lkb(r, lkb, DLM_LKSTS_WAITING);
+ send_blocking_asts(r, lkb);
+ goto out;
+ }
+
+ error = -EAGAIN;
+ if (force_blocking_asts(lkb))
+ send_blocking_asts_all(r, lkb);
+ queue_cast(r, lkb, -EAGAIN);
+
+ out:
+ return error;
+}
+
+static int do_convert(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ int error = 0;
+
+ /* changing an existing lock may allow others to be granted */
+
+ if (can_be_granted(r, lkb, TRUE)) {
+ grant_lock(r, lkb);
+ queue_cast(r, lkb, 0);
+ grant_pending_locks(r);
+ goto out;
+ }
+
+ if (can_be_queued(lkb)) {
+ if (is_demoted(lkb))
+ grant_pending_locks(r);
+ error = -EINPROGRESS;
+ del_lkb(r, lkb);
+ add_lkb(r, lkb, DLM_LKSTS_CONVERT);
+ send_blocking_asts(r, lkb);
+ goto out;
+ }
+
+ error = -EAGAIN;
+ if (force_blocking_asts(lkb))
+ send_blocking_asts_all(r, lkb);
+ queue_cast(r, lkb, -EAGAIN);
+
+ out:
+ return error;
+}
+
+static int do_unlock(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ remove_lock(r, lkb);
+ queue_cast(r, lkb, -DLM_EUNLOCK);
+ grant_pending_locks(r);
+ return -DLM_EUNLOCK;
+}
+
+static int do_cancel(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ revert_lock(r, lkb);
+ queue_cast(r, lkb, -DLM_ECANCEL);
+ grant_pending_locks(r);
+ return -DLM_ECANCEL;
+}
+
+/*
+ * Four stage 3 varieties:
+ * _request_lock(), _convert_lock(), _unlock_lock(), _cancel_lock()
+ */
+
+/* add a new lkb to a possibly new rsb, called by requesting process */
+
+static int _request_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ int error;
+
+ /* set_master: sets lkb nodeid from r */
+
+ error = set_master(r, lkb);
+ if (error < 0)
+ goto out;
+ if (error) {
+ error = 0;
+ goto out;
+ }
+
+ if (is_remote(r))
+ /* receive_request() calls do_request() on remote node */
+ error = send_request(r, lkb);
+ else
+ error = do_request(r, lkb);
+ out:
+ return error;
+}
+
+/* change some property of an existing lkb, e.g. mode, range */
+
+static int _convert_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ int error;
+
+ if (is_remote(r))
+ /* receive_convert() calls do_convert() on remote node */
+ error = send_convert(r, lkb);
+ else
+ error = do_convert(r, lkb);
+
+ return error;
+}
+
+/* remove an existing lkb from the granted queue */
+
+static int _unlock_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ int error;
+
+ if (is_remote(r))
+ /* receive_unlock() calls do_unlock() on remote node */
+ error = send_unlock(r, lkb);
+ else
+ error = do_unlock(r, lkb);
+
+ return error;
+}
+
+/* remove an existing lkb from the convert or wait queue */
+
+static int _cancel_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ int error;
+
+ if (is_remote(r))
+ /* receive_cancel() calls do_cancel() on remote node */
+ error = send_cancel(r, lkb);
+ else
+ error = do_cancel(r, lkb);
+
+ return error;
+}
+
+/*
+ * Four stage 2 varieties:
+ * request_lock(), convert_lock(), unlock_lock(), cancel_lock()
+ */
+
+static int request_lock(struct dlm_ls *ls, struct dlm_lkb *lkb, char *name,
+ int len, struct dlm_args *args)
+{
+ struct dlm_rsb *r;
+ int error;
+
+ error = validate_lock_args(ls, lkb, args);
+ if (error)
+ goto out;
+
+ error = find_rsb(ls, name, len, R_CREATE, &r);
+ if (error)
+ goto out;
+
+ lock_rsb(r);
+
+ attach_lkb(r, lkb);
+ lkb->lkb_lksb->sb_lkid = lkb->lkb_id;
+
+ error = _request_lock(r, lkb);
+
+ unlock_rsb(r);
+ put_rsb(r);
+
+ out:
+ return error;
+}
+
+static int convert_lock(struct dlm_ls *ls, struct dlm_lkb *lkb,
+ struct dlm_args *args)
+{
+ struct dlm_rsb *r;
+ int error;
+
+ r = lkb->lkb_resource;
+
+ hold_rsb(r);
+ lock_rsb(r);
+
+ error = validate_lock_args(ls, lkb, args);
+ if (error)
+ goto out;
+
+ error = _convert_lock(r, lkb);
+ out:
+ unlock_rsb(r);
+ put_rsb(r);
+ return error;
+}
+
+static int unlock_lock(struct dlm_ls *ls, struct dlm_lkb *lkb,
+ struct dlm_args *args)
+{
+ struct dlm_rsb *r;
+ int error;
+
+ r = lkb->lkb_resource;
+
+ hold_rsb(r);
+ lock_rsb(r);
+
+ error = validate_unlock_args(lkb, args);
+ if (error)
+ goto out;
+
+ error = _unlock_lock(r, lkb);
+ out:
+ unlock_rsb(r);
+ put_rsb(r);
+ return error;
+}
+
+static int cancel_lock(struct dlm_ls *ls, struct dlm_lkb *lkb,
+ struct dlm_args *args)
+{
+ struct dlm_rsb *r;
+ int error;
+
+ r = lkb->lkb_resource;
+
+ hold_rsb(r);
+ lock_rsb(r);
+
+ error = validate_unlock_args(lkb, args);
+ if (error)
+ goto out;
+
+ error = _cancel_lock(r, lkb);
+ out:
+ unlock_rsb(r);
+ put_rsb(r);
+ return error;
+}
+
+/*
+ * Two stage 1 varieties: dlm_lock() and dlm_unlock()
+ */
+
+int dlm_lock(dlm_lockspace_t *lockspace,
+ int mode,
+ struct dlm_lksb *lksb,
+ uint32_t flags,
+ void *name,
+ unsigned int namelen,
+ uint32_t parent_lkid,
+ void (*ast) (void *astarg),
+ void *astarg,
+ void (*bast) (void *astarg, int mode),
+ struct dlm_range *range)
+{
+ struct dlm_ls *ls;
+ struct dlm_lkb *lkb;
+ struct dlm_args args;
+ int error, convert = flags & DLM_LKF_CONVERT;
+
+ ls = dlm_find_lockspace_local(lockspace);
+ if (!ls)
+ return -EINVAL;
+
+ lock_recovery(ls);
+
+ if (convert)
+ error = find_lkb(ls, lksb->sb_lkid, &lkb);
+ else
+ error = create_lkb(ls, &lkb);
+
+ if (error)
+ goto out;
+
+ error = set_lock_args(mode, lksb, flags, namelen, parent_lkid, ast,
+ astarg, bast, range, &args);
+ if (error)
+ goto out_put;
+
+ if (convert)
+ error = convert_lock(ls, lkb, &args);
+ else
+ error = request_lock(ls, lkb, name, namelen, &args);
+
+ if (error == -EINPROGRESS)
+ error = 0;
+ out_put:
+ if (convert || error)
+ put_lkb(lkb);
+ if (error == -EAGAIN)
+ error = 0;
+ out:
+ unlock_recovery(ls);
+ dlm_put_lockspace(ls);
+ return error;
+}
+
+int dlm_unlock(dlm_lockspace_t *lockspace,
+ uint32_t lkid,
+ uint32_t flags,
+ struct dlm_lksb *lksb,
+ void *astarg)
+{
+ struct dlm_ls *ls;
+ struct dlm_lkb *lkb;
+ struct dlm_args args;
+ int error;
+
+ ls = dlm_find_lockspace_local(lockspace);
+ if (!ls)
+ return -EINVAL;
+
+ lock_recovery(ls);
+
+ error = find_lkb(ls, lkid, &lkb);
+ if (error)
+ goto out;
+
+ error = set_unlock_args(flags, astarg, &args);
+ if (error)
+ goto out_put;
+
+ if (flags & DLM_LKF_CANCEL)
+ error = cancel_lock(ls, lkb, &args);
+ else
+ error = unlock_lock(ls, lkb, &args);
+
+ if (error == -DLM_EUNLOCK || error == -DLM_ECANCEL)
+ error = 0;
+ out_put:
+ put_lkb(lkb);
+ out:
+ unlock_recovery(ls);
+ dlm_put_lockspace(ls);
+ return error;
+}
+
+/*
+ * send/receive routines for remote operations and replies
+ *
+ * send_args
+ * send_common
+ * send_request receive_request
+ * send_convert receive_convert
+ * send_unlock receive_unlock
+ * send_cancel receive_cancel
+ * send_grant receive_grant
+ * send_bast receive_bast
+ * send_lookup receive_lookup
+ * send_remove receive_remove
+ *
+ * send_common_reply
+ * receive_request_reply send_request_reply
+ * receive_convert_reply send_convert_reply
+ * receive_unlock_reply send_unlock_reply
+ * receive_cancel_reply send_cancel_reply
+ * receive_lookup_reply send_lookup_reply
+ */
+
+static int create_message(struct dlm_rsb *r, struct dlm_lkb *lkb,
+ int to_nodeid, int mstype,
+ struct dlm_message **ms_ret,
+ struct dlm_mhandle **mh_ret)
+{
+ struct dlm_message *ms;
+ struct dlm_mhandle *mh;
+ char *mb;
+ int mb_len = sizeof(struct dlm_message);
+
+ switch (mstype) {
+ case DLM_MSG_REQUEST:
+ case DLM_MSG_LOOKUP:
+ case DLM_MSG_REMOVE:
+ mb_len += r->res_length;
+ break;
+ case DLM_MSG_CONVERT:
+ case DLM_MSG_UNLOCK:
+ case DLM_MSG_REQUEST_REPLY:
+ case DLM_MSG_CONVERT_REPLY:
+ case DLM_MSG_GRANT:
+ if (lkb && lkb->lkb_lvbptr)
+ mb_len += r->res_ls->ls_lvblen;
+ break;
+ }
+
+ /* get_buffer gives us a message handle (mh) that we need to
+ pass into lowcomms_commit and a message buffer (mb) that we
+ write our data into */
+
+ mh = dlm_lowcomms_get_buffer(to_nodeid, mb_len, GFP_KERNEL, &mb);
+ if (!mh)
+ return -ENOBUFS;
+
+ memset(mb, 0, mb_len);
+
+ ms = (struct dlm_message *) mb;
+
+ ms->m_header.h_version = (DLM_HEADER_MAJOR | DLM_HEADER_MINOR);
+ ms->m_header.h_lockspace = r->res_ls->ls_global_id;
+ ms->m_header.h_nodeid = dlm_our_nodeid();
+ ms->m_header.h_length = mb_len;
+ ms->m_header.h_cmd = DLM_MSG;
+
+ ms->m_type = mstype;
+
+ *mh_ret = mh;
+ *ms_ret = ms;
+ return 0;
+}
+
+/* further lowcomms enhancements or alternate implementations may make
+ the return value from this function useful at some point */
+
+static int send_message(struct dlm_mhandle *mh, struct dlm_message *ms)
+{
+ dlm_message_out(ms);
+ dlm_lowcomms_commit_buffer(mh);
+ return 0;
+}
+
+static void send_args(struct dlm_rsb *r, struct dlm_lkb *lkb,
+ struct dlm_message *ms)
+{
+ ms->m_nodeid = lkb->lkb_nodeid;
+ ms->m_pid = lkb->lkb_ownpid;
+ ms->m_lkid = lkb->lkb_id;
+ ms->m_remid = lkb->lkb_remid;
+ ms->m_exflags = lkb->lkb_exflags;
+ ms->m_sbflags = lkb->lkb_sbflags;
+ ms->m_flags = lkb->lkb_flags;
+ ms->m_lvbseq = lkb->lkb_lvbseq;
+ 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 */
+
+ if (lkb->lkb_bastaddr)
+ ms->m_asts |= AST_BAST;
+ if (lkb->lkb_astaddr)
+ ms->m_asts |= AST_COMP;
+
+ if (lkb->lkb_range) {
+ ms->m_range[0] = lkb->lkb_range[RQ_RANGE_START];
+ ms->m_range[1] = lkb->lkb_range[RQ_RANGE_END];
+ }
+
+ if (ms->m_type == DLM_MSG_REQUEST || ms->m_type == DLM_MSG_LOOKUP)
+ memcpy(ms->m_extra, r->res_name, r->res_length);
+
+ else if (lkb->lkb_lvbptr)
+ memcpy(ms->m_extra, lkb->lkb_lvbptr, r->res_ls->ls_lvblen);
+
+}
+
+static int send_common(struct dlm_rsb *r, struct dlm_lkb *lkb, int mstype)
+{
+ struct dlm_message *ms;
+ struct dlm_mhandle *mh;
+ int to_nodeid, error;
+
+ add_to_waiters(lkb, mstype);
+
+ to_nodeid = r->res_nodeid;
+
+ error = create_message(r, lkb, to_nodeid, mstype, &ms, &mh);
+ if (error)
+ goto fail;
+
+ send_args(r, lkb, ms);
+
+ error = send_message(mh, ms);
+ if (error)
+ goto fail;
+ return 0;
+
+ fail:
+ remove_from_waiters(lkb);
+ return error;
+}
+
+static int send_request(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ return send_common(r, lkb, DLM_MSG_REQUEST);
+}
+
+static int send_convert(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ int error;
+
+ error = send_common(r, lkb, DLM_MSG_CONVERT);
+
+ /* down conversions go without a reply from the master */
+ if (!error && down_conversion(lkb)) {
+ remove_from_waiters(lkb);
+ r->res_ls->ls_stub_ms.m_result = 0;
+ __receive_convert_reply(r, lkb, &r->res_ls->ls_stub_ms);
+ }
+
+ return error;
+}
+
+/* FIXME: if this lkb is the only lock we hold on the rsb, then set
+ MASTER_UNCERTAIN to force the next request on the rsb to confirm
+ that the master is still correct. */
+
+static int send_unlock(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ return send_common(r, lkb, DLM_MSG_UNLOCK);
+}
+
+static int send_cancel(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ return send_common(r, lkb, DLM_MSG_CANCEL);
+}
+
+static int send_grant(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ struct dlm_message *ms;
+ struct dlm_mhandle *mh;
+ int to_nodeid, error;
+
+ to_nodeid = lkb->lkb_nodeid;
+
+ error = create_message(r, lkb, to_nodeid, DLM_MSG_GRANT, &ms, &mh);
+ if (error)
+ goto out;
+
+ send_args(r, lkb, ms);
+
+ ms->m_result = 0;
+
+ error = send_message(mh, ms);
+ out:
+ return error;
+}
+
+static int send_bast(struct dlm_rsb *r, struct dlm_lkb *lkb, int mode)
+{
+ struct dlm_message *ms;
+ struct dlm_mhandle *mh;
+ int to_nodeid, error;
+
+ to_nodeid = lkb->lkb_nodeid;
+
+ error = create_message(r, NULL, to_nodeid, DLM_MSG_BAST, &ms, &mh);
+ if (error)
+ goto out;
+
+ send_args(r, lkb, ms);
+
+ ms->m_bastmode = mode;
+
+ error = send_message(mh, ms);
+ out:
+ return error;
+}
+
+static int send_lookup(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ struct dlm_message *ms;
+ struct dlm_mhandle *mh;
+ int to_nodeid, error;
+
+ add_to_waiters(lkb, DLM_MSG_LOOKUP);
+
+ to_nodeid = dlm_dir_nodeid(r);
+
+ error = create_message(r, NULL, to_nodeid, DLM_MSG_LOOKUP, &ms, &mh);
+ if (error)
+ goto fail;
+
+ send_args(r, lkb, ms);
+
+ error = send_message(mh, ms);
+ if (error)
+ goto fail;
+ return 0;
+
+ fail:
+ remove_from_waiters(lkb);
+ return error;
+}
+
+static int send_remove(struct dlm_rsb *r)
+{
+ struct dlm_message *ms;
+ struct dlm_mhandle *mh;
+ int to_nodeid, error;
+
+ to_nodeid = dlm_dir_nodeid(r);
+
+ error = create_message(r, NULL, to_nodeid, DLM_MSG_REMOVE, &ms, &mh);
+ if (error)
+ goto out;
+
+ memcpy(ms->m_extra, r->res_name, r->res_length);
+ ms->m_hash = r->res_hash;
+
+ error = send_message(mh, ms);
+ out:
+ return error;
+}
+
+static int send_common_reply(struct dlm_rsb *r, struct dlm_lkb *lkb,
+ int mstype, int rv)
+{
+ struct dlm_message *ms;
+ struct dlm_mhandle *mh;
+ int to_nodeid, error;
+
+ to_nodeid = lkb->lkb_nodeid;
+
+ error = create_message(r, lkb, to_nodeid, mstype, &ms, &mh);
+ if (error)
+ goto out;
+
+ send_args(r, lkb, ms);
+
+ ms->m_result = rv;
+
+ error = send_message(mh, ms);
+ out:
+ return error;
+}
+
+static int send_request_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv)
+{
+ return send_common_reply(r, lkb, DLM_MSG_REQUEST_REPLY, rv);
+}
+
+static int send_convert_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv)
+{
+ return send_common_reply(r, lkb, DLM_MSG_CONVERT_REPLY, rv);
+}
+
+static int send_unlock_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv)
+{
+ return send_common_reply(r, lkb, DLM_MSG_UNLOCK_REPLY, rv);
+}
+
+static int send_cancel_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv)
+{
+ return send_common_reply(r, lkb, DLM_MSG_CANCEL_REPLY, rv);
+}
+
+static int send_lookup_reply(struct dlm_ls *ls, struct dlm_message *ms_in,
+ int ret_nodeid, int rv)
+{
+ struct dlm_rsb *r = &ls->ls_stub_rsb;
+ struct dlm_message *ms;
+ struct dlm_mhandle *mh;
+ int error, nodeid = ms_in->m_header.h_nodeid;
+
+ error = create_message(r, NULL, nodeid, DLM_MSG_LOOKUP_REPLY, &ms, &mh);
+ if (error)
+ goto out;
+
+ ms->m_lkid = ms_in->m_lkid;
+ ms->m_result = rv;
+ ms->m_nodeid = ret_nodeid;
+
+ error = send_message(mh, ms);
+ out:
+ return error;
+}
+
+/* which args we save from a received message depends heavily on the type
+ of message, unlike the send side where we can safely send everything about
+ the lkb for any type of message */
+
+static void receive_flags(struct dlm_lkb *lkb, struct dlm_message *ms)
+{
+ lkb->lkb_exflags = ms->m_exflags;
+ lkb->lkb_flags = (lkb->lkb_flags & 0xFFFF0000) |
+ (ms->m_flags & 0x0000FFFF);
+}
+
+static void receive_flags_reply(struct dlm_lkb *lkb, struct dlm_message *ms)
+{
+ lkb->lkb_sbflags = ms->m_sbflags;
+ lkb->lkb_flags = (lkb->lkb_flags & 0xFFFF0000) |
+ (ms->m_flags & 0x0000FFFF);
+}
+
+static int receive_extralen(struct dlm_message *ms)
+{
+ return (ms->m_header.h_length - sizeof(struct dlm_message));
+}
+
+static int receive_range(struct dlm_ls *ls, struct dlm_lkb *lkb,
+ struct dlm_message *ms)
+{
+ if (lkb->lkb_flags & DLM_IFL_RANGE) {
+ if (!lkb->lkb_range)
+ lkb->lkb_range = allocate_range(ls);
+ if (!lkb->lkb_range)
+ return -ENOMEM;
+ lkb->lkb_range[RQ_RANGE_START] = ms->m_range[0];
+ lkb->lkb_range[RQ_RANGE_END] = ms->m_range[1];
+ }
+ return 0;
+}
+
+static int receive_lvb(struct dlm_ls *ls, struct dlm_lkb *lkb,
+ struct dlm_message *ms)
+{
+ int len;
+
+ if (lkb->lkb_exflags & DLM_LKF_VALBLK) {
+ if (!lkb->lkb_lvbptr)
+ lkb->lkb_lvbptr = allocate_lvb(ls);
+ if (!lkb->lkb_lvbptr)
+ return -ENOMEM;
+ len = receive_extralen(ms);
+ memcpy(lkb->lkb_lvbptr, ms->m_extra, len);
+ }
+ return 0;
+}
+
+static int receive_request_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
+ struct dlm_message *ms)
+{
+ lkb->lkb_nodeid = ms->m_header.h_nodeid;
+ lkb->lkb_ownpid = ms->m_pid;
+ lkb->lkb_remid = ms->m_lkid;
+ lkb->lkb_grmode = DLM_LOCK_IV;
+ lkb->lkb_rqmode = ms->m_rqmode;
+ lkb->lkb_bastaddr = (void *) (long) (ms->m_asts & AST_BAST);
+ lkb->lkb_astaddr = (void *) (long) (ms->m_asts & AST_COMP);
+
+ DLM_ASSERT(is_master_copy(lkb), dlm_print_lkb(lkb););
+
+ if (receive_range(ls, lkb, ms))
+ return -ENOMEM;
+
+ if (receive_lvb(ls, lkb, ms))
+ return -ENOMEM;
+
+ return 0;
+}
+
+static int receive_convert_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
+ struct dlm_message *ms)
+{
+ if (lkb->lkb_nodeid != ms->m_header.h_nodeid) {
+ log_error(ls, "convert_args nodeid %d %d lkid %x %x",
+ lkb->lkb_nodeid, ms->m_header.h_nodeid,
+ lkb->lkb_id, lkb->lkb_remid);
+ return -EINVAL;
+ }
+
+ if (!is_master_copy(lkb))
+ return -EINVAL;
+
+ if (lkb->lkb_status != DLM_LKSTS_GRANTED)
+ return -EBUSY;
+
+ if (receive_range(ls, lkb, ms))
+ return -ENOMEM;
+ if (lkb->lkb_range) {
+ lkb->lkb_range[GR_RANGE_START] = 0LL;
+ lkb->lkb_range[GR_RANGE_END] = 0xffffffffffffffffULL;
+ }
+
+ if (receive_lvb(ls, lkb, ms))
+ return -ENOMEM;
+
+ lkb->lkb_rqmode = ms->m_rqmode;
+ lkb->lkb_lvbseq = ms->m_lvbseq;
+
+ return 0;
+}
+
+static int receive_unlock_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
+ struct dlm_message *ms)
+{
+ if (!is_master_copy(lkb))
+ return -EINVAL;
+ if (receive_lvb(ls, lkb, ms))
+ return -ENOMEM;
+ return 0;
+}
+
+/* We fill in the stub-lkb fields with the info that send_xxxx_reply()
+ uses to send a reply and that the remote end uses to process the reply. */
+
+static void setup_stub_lkb(struct dlm_ls *ls, struct dlm_message *ms)
+{
+ struct dlm_lkb *lkb = &ls->ls_stub_lkb;
+ lkb->lkb_nodeid = ms->m_header.h_nodeid;
+ lkb->lkb_remid = ms->m_lkid;
+}
+
+static void receive_request(struct dlm_ls *ls, struct dlm_message *ms)
+{
+ struct dlm_lkb *lkb;
+ struct dlm_rsb *r;
+ int error, namelen;
+
+ error = create_lkb(ls, &lkb);
+ if (error)
+ goto fail;
+
+ receive_flags(lkb, ms);
+ lkb->lkb_flags |= DLM_IFL_MSTCPY;
+ error = receive_request_args(ls, lkb, ms);
+ if (error) {
+ put_lkb(lkb);
+ goto fail;
+ }
+
+ namelen = receive_extralen(ms);
+
+ error = find_rsb(ls, ms->m_extra, namelen, R_MASTER, &r);
+ if (error) {
+ put_lkb(lkb);
+ goto fail;
+ }
+
+ lock_rsb(r);
+
+ attach_lkb(r, lkb);
+ error = do_request(r, lkb);
+ send_request_reply(r, lkb, error);
+
+ unlock_rsb(r);
+ put_rsb(r);
+
+ if (error == -EINPROGRESS)
+ error = 0;
+ if (error)
+ put_lkb(lkb);
+ return;
+
+ fail:
+ setup_stub_lkb(ls, ms);
+ send_request_reply(&ls->ls_stub_rsb, &ls->ls_stub_lkb, error);
+}
+
+static void receive_convert(struct dlm_ls *ls, struct dlm_message *ms)
+{
+ struct dlm_lkb *lkb;
+ struct dlm_rsb *r;
+ int error, reply = TRUE;
+
+ error = find_lkb(ls, ms->m_remid, &lkb);
+ if (error)
+ goto fail;
+
+ r = lkb->lkb_resource;
+
+ hold_rsb(r);
+ lock_rsb(r);
+
+ receive_flags(lkb, ms);
+ error = receive_convert_args(ls, lkb, ms);
+ if (error)
+ goto out;
+ reply = !down_conversion(lkb);
+
+ error = do_convert(r, lkb);
+ out:
+ if (reply)
+ send_convert_reply(r, lkb, error);
+
+ unlock_rsb(r);
+ put_rsb(r);
+ put_lkb(lkb);
+ return;
+
+ fail:
+ setup_stub_lkb(ls, ms);
+ send_convert_reply(&ls->ls_stub_rsb, &ls->ls_stub_lkb, error);
+}
+
+static void receive_unlock(struct dlm_ls *ls, struct dlm_message *ms)
+{
+ struct dlm_lkb *lkb;
+ struct dlm_rsb *r;
+ int error;
+
+ error = find_lkb(ls, ms->m_remid, &lkb);
+ if (error)
+ goto fail;
+
+ r = lkb->lkb_resource;
+
+ hold_rsb(r);
+ lock_rsb(r);
+
+ receive_flags(lkb, ms);
+ error = receive_unlock_args(ls, lkb, ms);
+ if (error)
+ goto out;
+
+ error = do_unlock(r, lkb);
+ out:
+ send_unlock_reply(r, lkb, error);
+
+ unlock_rsb(r);
+ put_rsb(r);
+ put_lkb(lkb);
+ return;
+
+ fail:
+ setup_stub_lkb(ls, ms);
+ send_unlock_reply(&ls->ls_stub_rsb, &ls->ls_stub_lkb, error);
+}
+
+static void receive_cancel(struct dlm_ls *ls, struct dlm_message *ms)
+{
+ struct dlm_lkb *lkb;
+ struct dlm_rsb *r;
+ int error;
+
+ error = find_lkb(ls, ms->m_remid, &lkb);
+ if (error)
+ goto fail;
+
+ receive_flags(lkb, ms);
+
+ r = lkb->lkb_resource;
+
+ hold_rsb(r);
+ lock_rsb(r);
+
+ error = do_cancel(r, lkb);
+ send_cancel_reply(r, lkb, error);
+
+ unlock_rsb(r);
+ put_rsb(r);
+ put_lkb(lkb);
+ return;
+
+ fail:
+ setup_stub_lkb(ls, ms);
+ send_cancel_reply(&ls->ls_stub_rsb, &ls->ls_stub_lkb, error);
+}
+
+static void receive_grant(struct dlm_ls *ls, struct dlm_message *ms)
+{
+ struct dlm_lkb *lkb;
+ struct dlm_rsb *r;
+ int error;
+
+ error = find_lkb(ls, ms->m_remid, &lkb);
+ if (error) {
+ log_error(ls, "receive_grant no lkb");
+ return;
+ }
+ DLM_ASSERT(is_process_copy(lkb), dlm_print_lkb(lkb););
+
+ r = lkb->lkb_resource;
+
+ hold_rsb(r);
+ lock_rsb(r);
+
+ receive_flags_reply(lkb, ms);
+ grant_lock_pc(r, lkb, ms);
+ queue_cast(r, lkb, 0);
+
+ unlock_rsb(r);
+ put_rsb(r);
+ put_lkb(lkb);
+}
+
+static void receive_bast(struct dlm_ls *ls, struct dlm_message *ms)
+{
+ struct dlm_lkb *lkb;
+ struct dlm_rsb *r;
+ int error;
+
+ error = find_lkb(ls, ms->m_remid, &lkb);
+ if (error) {
+ log_error(ls, "receive_bast no lkb");
+ return;
+ }
+ DLM_ASSERT(is_process_copy(lkb), dlm_print_lkb(lkb););
+
+ r = lkb->lkb_resource;
+
+ hold_rsb(r);
+ lock_rsb(r);
+
+ queue_bast(r, lkb, ms->m_bastmode);
+
+ unlock_rsb(r);
+ put_rsb(r);
+ put_lkb(lkb);
+}
+
+static void receive_lookup(struct dlm_ls *ls, struct dlm_message *ms)
+{
+ int len, error, ret_nodeid, dir_nodeid, from_nodeid, our_nodeid;
+
+ from_nodeid = ms->m_header.h_nodeid;
+ our_nodeid = dlm_our_nodeid();
+
+ len = receive_extralen(ms);
+
+ 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);
+ error = -EINVAL;
+ ret_nodeid = -1;
+ goto out;
+ }
+
+ error = dlm_dir_lookup(ls, from_nodeid, ms->m_extra, len, &ret_nodeid);
+
+ /* Optimization: we're master so treat lookup as a request */
+ if (!error && ret_nodeid == our_nodeid) {
+ receive_request(ls, ms);
+ return;
+ }
+ out:
+ send_lookup_reply(ls, ms, ret_nodeid, error);
+}
+
+static void receive_remove(struct dlm_ls *ls, struct dlm_message *ms)
+{
+ int len, dir_nodeid, from_nodeid;
+
+ from_nodeid = ms->m_header.h_nodeid;
+
+ len = receive_extralen(ms);
+
+ 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);
+ return;
+ }
+
+ dlm_dir_remove_entry(ls, from_nodeid, ms->m_extra, len);
+}
+
+static void receive_request_reply(struct dlm_ls *ls, struct dlm_message *ms)
+{
+ struct dlm_lkb *lkb;
+ struct dlm_rsb *r;
+ int error, mstype;
+
+ error = find_lkb(ls, ms->m_remid, &lkb);
+ if (error) {
+ log_error(ls, "receive_request_reply no lkb");
+ return;
+ }
+ DLM_ASSERT(is_process_copy(lkb), dlm_print_lkb(lkb););
+
+ mstype = lkb->lkb_wait_type;
+ error = remove_from_waiters(lkb);
+ if (error) {
+ log_error(ls, "receive_request_reply not on waiters");
+ goto out;
+ }
+
+ /* this is the value returned from do_request() on the master */
+ error = ms->m_result;
+
+ r = lkb->lkb_resource;
+ hold_rsb(r);
+ lock_rsb(r);
+
+ /* Optimization: the dir node was also the master, so it took our
+ lookup as a request and sent request reply instead of lookup reply */
+ if (mstype == DLM_MSG_LOOKUP) {
+ r->res_nodeid = ms->m_header.h_nodeid;
+ lkb->lkb_nodeid = r->res_nodeid;
+ }
+
+ switch (error) {
+ case -EAGAIN:
+ /* request would block (be queued) on remote master;
+ the unhold undoes the original ref from create_lkb()
+ so it leads to the lkb being freed */
+ queue_cast(r, lkb, -EAGAIN);
+ confirm_master(r, -EAGAIN);
+ unhold_lkb(lkb);
+ break;
+
+ case -EINPROGRESS:
+ case 0:
+ /* request was queued or granted on remote master */
+ receive_flags_reply(lkb, ms);
+ lkb->lkb_remid = ms->m_lkid;
+ if (error)
+ add_lkb(r, lkb, DLM_LKSTS_WAITING);
+ else {
+ grant_lock_pc(r, lkb, ms);
+ queue_cast(r, lkb, 0);
+ }
+ confirm_master(r, error);
+ break;
+
+ case -ENOENT:
+ case -ENOTBLK:
+ /* find_rsb failed to find rsb or rsb wasn't master */
+ r->res_nodeid = -1;
+ lkb->lkb_nodeid = -1;
+ _request_lock(r, lkb);
+ break;
+
+ default:
+ log_error(ls, "receive_request_reply error %d", error);
+ }
+
+ unlock_rsb(r);
+ put_rsb(r);
+ out:
+ put_lkb(lkb);
+}
+
+static void __receive_convert_reply(struct dlm_rsb *r, struct dlm_lkb *lkb,
+ struct dlm_message *ms)
+{
+ int error = ms->m_result;
+
+ /* this is the value returned from do_convert() on the master */
+
+ switch (error) {
+ case -EAGAIN:
+ /* convert would block (be queued) on remote master */
+ queue_cast(r, lkb, -EAGAIN);
+ break;
+
+ case -EINPROGRESS:
+ /* convert was queued on remote master */
+ del_lkb(r, lkb);
+ add_lkb(r, lkb, DLM_LKSTS_CONVERT);
+ break;
+
+ case 0:
+ /* convert was granted on remote master */
+ receive_flags_reply(lkb, ms);
+ grant_lock_pc(r, lkb, ms);
+ queue_cast(r, lkb, 0);
+ break;
+
+ default:
+ log_error(r->res_ls, "receive_convert_reply error %d", error);
+ }
+}
+
+static void _receive_convert_reply(struct dlm_lkb *lkb, struct dlm_message *ms)
+{
+ struct dlm_rsb *r = lkb->lkb_resource;
+
+ hold_rsb(r);
+ lock_rsb(r);
+
+ __receive_convert_reply(r, lkb, ms);
+
+ unlock_rsb(r);
+ put_rsb(r);
+}
+
+static void receive_convert_reply(struct dlm_ls *ls, struct dlm_message *ms)
+{
+ struct dlm_lkb *lkb;
+ int error;
+
+ error = find_lkb(ls, ms->m_remid, &lkb);
+ if (error) {
+ log_error(ls, "receive_convert_reply no lkb");
+ return;
+ }
+ DLM_ASSERT(is_process_copy(lkb), dlm_print_lkb(lkb););
+
+ error = remove_from_waiters(lkb);
+ if (error) {
+ log_error(ls, "receive_convert_reply not on waiters");
+ goto out;
+ }
+
+ _receive_convert_reply(lkb, ms);
+ out:
+ put_lkb(lkb);
+}
+
+static void _receive_unlock_reply(struct dlm_lkb *lkb, struct dlm_message *ms)
+{
+ struct dlm_rsb *r = lkb->lkb_resource;
+ int error = ms->m_result;
+
+ hold_rsb(r);
+ lock_rsb(r);
+
+ /* this is the value returned from do_unlock() on the master */
+
+ switch (error) {
+ case -DLM_EUNLOCK:
+ receive_flags_reply(lkb, ms);
+ remove_lock_pc(r, lkb);
+ queue_cast(r, lkb, -DLM_EUNLOCK);
+ break;
+ default:
+ log_error(r->res_ls, "receive_unlock_reply error %d", error);
+ }
+
+ unlock_rsb(r);
+ put_rsb(r);
+}
+
+static void receive_unlock_reply(struct dlm_ls *ls, struct dlm_message *ms)
+{
+ struct dlm_lkb *lkb;
+ int error;
+
+ error = find_lkb(ls, ms->m_remid, &lkb);
+ if (error) {
+ log_error(ls, "receive_unlock_reply no lkb");
+ return;
+ }
+ DLM_ASSERT(is_process_copy(lkb), dlm_print_lkb(lkb););
+
+ error = remove_from_waiters(lkb);
+ if (error) {
+ log_error(ls, "receive_unlock_reply not on waiters");
+ goto out;
+ }
+
+ _receive_unlock_reply(lkb, ms);
+ out:
+ put_lkb(lkb);
+}
+
+static void _receive_cancel_reply(struct dlm_lkb *lkb, struct dlm_message *ms)
+{
+ struct dlm_rsb *r = lkb->lkb_resource;
+ int error = ms->m_result;
+
+ hold_rsb(r);
+ lock_rsb(r);
+
+ /* this is the value returned from do_cancel() on the master */
+
+ switch (error) {
+ case -DLM_ECANCEL:
+ receive_flags_reply(lkb, ms);
+ revert_lock_pc(r, lkb);
+ queue_cast(r, lkb, -DLM_ECANCEL);
+ break;
+ default:
+ log_error(r->res_ls, "receive_cancel_reply error %d", error);
+ }
+
+ unlock_rsb(r);
+ put_rsb(r);
+}
+
+static void receive_cancel_reply(struct dlm_ls *ls, struct dlm_message *ms)
+{
+ struct dlm_lkb *lkb;
+ int error;
+
+ error = find_lkb(ls, ms->m_remid, &lkb);
+ if (error) {
+ log_error(ls, "receive_cancel_reply no lkb");
+ return;
+ }
+ DLM_ASSERT(is_process_copy(lkb), dlm_print_lkb(lkb););
+
+ error = remove_from_waiters(lkb);
+ if (error) {
+ log_error(ls, "receive_cancel_reply not on waiters");
+ goto out;
+ }
+
+ _receive_cancel_reply(lkb, ms);
+ out:
+ put_lkb(lkb);
+}
+
+static void receive_lookup_reply(struct dlm_ls *ls, struct dlm_message *ms)
+{
+ struct dlm_lkb *lkb;
+ struct dlm_rsb *r;
+ int error, ret_nodeid;
+
+ error = find_lkb(ls, ms->m_lkid, &lkb);
+ if (error) {
+ log_error(ls, "receive_lookup_reply no lkb");
+ return;
+ }
+
+ error = remove_from_waiters(lkb);
+ if (error) {
+ log_error(ls, "receive_lookup_reply not on waiters");
+ goto out;
+ }
+
+ /* this is the value returned by dlm_dir_lookup on dir node
+ FIXME: will a non-zero error ever be returned? */
+ error = ms->m_result;
+
+ r = lkb->lkb_resource;
+ hold_rsb(r);
+ lock_rsb(r);
+
+ ret_nodeid = ms->m_nodeid;
+ if (ret_nodeid == dlm_our_nodeid()) {
+ r->res_nodeid = 0;
+ ret_nodeid = 0;
+ r->res_first_lkid = 0;
+ } else {
+ /* set_master() will copy res_nodeid to lkb_nodeid */
+ r->res_nodeid = ret_nodeid;
+ }
+
+ _request_lock(r, lkb);
+
+ if (!ret_nodeid)
+ process_lookup_list(r);
+
+ unlock_rsb(r);
+ put_rsb(r);
+ out:
+ put_lkb(lkb);
+}
+
+int dlm_receive_message(struct dlm_header *hd, int nodeid, int recovery)
+{
+ struct dlm_message *ms = (struct dlm_message *) hd;
+ struct dlm_ls *ls;
+ int error;
+
+ if (!recovery)
+ dlm_message_in(ms);
+
+ ls = dlm_find_lockspace_global(hd->h_lockspace);
+ if (!ls) {
+ log_print("drop message %d from %d for unknown lockspace %d",
+ ms->m_type, nodeid, hd->h_lockspace);
+ return -EINVAL;
+ }
+
+ /* recovery may have just ended leaving a bunch of backed-up requests
+ in the requestqueue; wait while dlm_recoverd clears them */
+
+ if (!recovery)
+ dlm_wait_requestqueue(ls);
+
+ /* recovery may have just started while there were a bunch of
+ in-flight requests -- save them in requestqueue to be processed
+ after recovery. we can't let dlm_recvd block on the recovery
+ lock. if dlm_recoverd is calling this function to clear the
+ requestqueue, it needs to be interrupted (-EINTR) if another
+ recovery operation is starting. */
+
+ while (1) {
+ if (dlm_locking_stopped(ls)) {
+ if (!recovery)
+ dlm_add_requestqueue(ls, nodeid, hd);
+ error = -EINTR;
+ goto out;
+ }
+
+ if (lock_recovery_try(ls))
+ break;
+ schedule();
+ }
+
+ switch (ms->m_type) {
+
+ /* messages sent to a master node */
+
+ case DLM_MSG_REQUEST:
+ receive_request(ls, ms);
+ break;
+
+ case DLM_MSG_CONVERT:
+ receive_convert(ls, ms);
+ break;
+
+ case DLM_MSG_UNLOCK:
+ receive_unlock(ls, ms);
+ break;
+
+ case DLM_MSG_CANCEL:
+ receive_cancel(ls, ms);
+ break;
+
+ /* messages sent from a master node (replies to above) */
+
+ case DLM_MSG_REQUEST_REPLY:
+ receive_request_reply(ls, ms);
+ break;
+
+ case DLM_MSG_CONVERT_REPLY:
+ receive_convert_reply(ls, ms);
+ break;
+
+ case DLM_MSG_UNLOCK_REPLY:
+ receive_unlock_reply(ls, ms);
+ break;
+
+ case DLM_MSG_CANCEL_REPLY:
+ receive_cancel_reply(ls, ms);
+ break;
+
+ /* messages sent from a master node (only two types of async msg) */
+
+ case DLM_MSG_GRANT:
+ receive_grant(ls, ms);
+ break;
+
+ case DLM_MSG_BAST:
+ receive_bast(ls, ms);
+ break;
+
+ /* messages sent to a dir node */
+
+ case DLM_MSG_LOOKUP:
+ receive_lookup(ls, ms);
+ break;
+
+ case DLM_MSG_REMOVE:
+ receive_remove(ls, ms);
+ break;
+
+ /* messages sent from a dir node (remove has no reply) */
+
+ case DLM_MSG_LOOKUP_REPLY:
+ receive_lookup_reply(ls, ms);
+ break;
+
+ default:
+ log_error(ls, "unknown message type %d", ms->m_type);
+ }
+
+ unlock_recovery(ls);
+ out:
+ dlm_put_lockspace(ls);
+ dlm_astd_wake();
+ return 0;
+}
+
+
+/*
+ * Recovery related
+ */
+
+static void recover_convert_waiter(struct dlm_ls *ls, struct dlm_lkb *lkb)
+{
+ if (middle_conversion(lkb)) {
+ hold_lkb(lkb);
+ ls->ls_stub_ms.m_result = -EINPROGRESS;
+ _remove_from_waiters(lkb);
+ _receive_convert_reply(lkb, &ls->ls_stub_ms);
+
+ /* Same special case as in receive_rcom_lock_args() */
+ lkb->lkb_grmode = DLM_LOCK_IV;
+ rsb_set_flag(lkb->lkb_resource, RSB_RECOVER_CONVERT);
+ unhold_lkb(lkb);
+
+ } else if (lkb->lkb_rqmode >= lkb->lkb_grmode) {
+ lkb->lkb_flags |= DLM_IFL_RESEND;
+ }
+
+ /* lkb->lkb_rqmode < lkb->lkb_grmode shouldn't happen since down
+ 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
+ recovery. Down-conversions can just be completed with a fake reply like
+ unlocks. Conversions between PR and CW need special attention. */
+
+void dlm_recover_waiters_pre(struct dlm_ls *ls)
+{
+ struct dlm_lkb *lkb, *safe;
+
+ down(&ls->ls_waiters_sem);
+
+ 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);
+
+ /* all outstanding lookups, regardless of destination will be
+ resent after recovery is done */
+
+ if (lkb->lkb_wait_type == DLM_MSG_LOOKUP) {
+ lkb->lkb_flags |= DLM_IFL_RESEND;
+ continue;
+ }
+
+ if (!waiter_needs_recovery(ls, lkb))
+ continue;
+
+ switch (lkb->lkb_wait_type) {
+
+ case DLM_MSG_REQUEST:
+ lkb->lkb_flags |= DLM_IFL_RESEND;
+ break;
+
+ case DLM_MSG_CONVERT:
+ recover_convert_waiter(ls, lkb);
+ break;
+
+ case DLM_MSG_UNLOCK:
+ hold_lkb(lkb);
+ ls->ls_stub_ms.m_result = -DLM_EUNLOCK;
+ _remove_from_waiters(lkb);
+ _receive_unlock_reply(lkb, &ls->ls_stub_ms);
+ put_lkb(lkb);
+ break;
+
+ case DLM_MSG_CANCEL:
+ hold_lkb(lkb);
+ ls->ls_stub_ms.m_result = -DLM_ECANCEL;
+ _remove_from_waiters(lkb);
+ _receive_cancel_reply(lkb, &ls->ls_stub_ms);
+ put_lkb(lkb);
+ break;
+
+ default:
+ log_error(ls, "invalid lkb wait_type %d",
+ lkb->lkb_wait_type);
+ }
+ }
+ up(&ls->ls_waiters_sem);
+}
+
+static int remove_resend_waiter(struct dlm_ls *ls, struct dlm_lkb **lkb_ret)
+{
+ struct dlm_lkb *lkb;
+ int rv = 0;
+
+ down(&ls->ls_waiters_sem);
+ list_for_each_entry(lkb, &ls->ls_waiters, lkb_wait_reply) {
+ if (lkb->lkb_flags & DLM_IFL_RESEND) {
+ rv = lkb->lkb_wait_type;
+ _remove_from_waiters(lkb);
+ lkb->lkb_flags &= ~DLM_IFL_RESEND;
+ break;
+ }
+ }
+ up(&ls->ls_waiters_sem);
+
+ if (!rv)
+ lkb = NULL;
+ *lkb_ret = lkb;
+ return rv;
+}
+
+/* Deal with lookups and lkb's marked RESEND from _pre. We may now be the
+ master or dir-node for r. Processing the lkb may result in it being placed
+ back on waiters. */
+
+int dlm_recover_waiters_post(struct dlm_ls *ls)
+{
+ struct dlm_lkb *lkb;
+ struct dlm_rsb *r;
+ int error = 0, mstype;
+
+ while (1) {
+ if (dlm_locking_stopped(ls)) {
+ log_debug(ls, "recover_waiters_post aborted");
+ error = -EINTR;
+ break;
+ }
+
+ mstype = remove_resend_waiter(ls, &lkb);
+ if (!mstype)
+ break;
+
+ r = lkb->lkb_resource;
+
+ log_debug(ls, "recover_waiters_post %x type %d flags %x %s",
+ lkb->lkb_id, mstype, lkb->lkb_flags, r->res_name);
+
+ switch (mstype) {
+
+ case DLM_MSG_LOOKUP:
+ hold_rsb(r);
+ lock_rsb(r);
+ _request_lock(r, lkb);
+ if (is_master(r))
+ confirm_master(r, 0);
+ unlock_rsb(r);
+ put_rsb(r);
+ break;
+
+ case DLM_MSG_REQUEST:
+ hold_rsb(r);
+ lock_rsb(r);
+ _request_lock(r, lkb);
+ unlock_rsb(r);
+ put_rsb(r);
+ break;
+
+ case DLM_MSG_CONVERT:
+ hold_rsb(r);
+ lock_rsb(r);
+ _convert_lock(r, lkb);
+ unlock_rsb(r);
+ put_rsb(r);
+ break;
+
+ default:
+ log_error(ls, "recover_waiters_post type %d", mstype);
+ }
+ }
+
+ return error;
+}
+
+static void purge_queue(struct dlm_rsb *r, struct list_head *queue,
+ int (*test)(struct dlm_ls *ls, struct dlm_lkb *lkb))
+{
+ struct dlm_ls *ls = r->res_ls;
+ struct dlm_lkb *lkb, *safe;
+
+ list_for_each_entry_safe(lkb, safe, queue, lkb_statequeue) {
+ if (test(ls, lkb)) {
+ del_lkb(r, lkb);
+ /* this put should free the lkb */
+ if (!put_lkb(lkb))
+ log_error(ls, "purged lkb not released");
+ }
+ }
+}
+
+static int purge_dead_test(struct dlm_ls *ls, struct dlm_lkb *lkb)
+{
+ 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);
+ purge_queue(r, &r->res_convertqueue, &purge_dead_test);
+ 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)
+{
+ struct dlm_rsb *r;
+
+ log_debug(ls, "dlm_purge_locks");
+
+ down_write(&ls->ls_root_sem);
+ list_for_each_entry(r, &ls->ls_root_list, res_root_list) {
+ hold_rsb(r);
+ lock_rsb(r);
+ if (is_master(r))
+ purge_dead_locks(r);
+ unlock_rsb(r);
+ unhold_rsb(r);
+
+ schedule();
+ }
+ up_write(&ls->ls_root_sem);
+
+ return 0;
+}
+
+int dlm_grant_after_purge(struct dlm_ls *ls)
+{
+ struct dlm_rsb *r;
+ int i;
+
+ for (i = 0; i < ls->ls_rsbtbl_size; i++) {
+ read_lock(&ls->ls_rsbtbl[i].lock);
+ list_for_each_entry(r, &ls->ls_rsbtbl[i].list, res_hashchain) {
+ hold_rsb(r);
+ lock_rsb(r);
+ if (is_master(r)) {
+ grant_pending_locks(r);
+ confirm_master(r, 0);
+ }
+ unlock_rsb(r);
+ put_rsb(r);
+ }
+ read_unlock(&ls->ls_rsbtbl[i].lock);
+ }
+
+ return 0;
+}
+
+static struct dlm_lkb *search_remid_list(struct list_head *head, int nodeid,
+ uint32_t remid)
+{
+ struct dlm_lkb *lkb;
+
+ list_for_each_entry(lkb, head, lkb_statequeue) {
+ if (lkb->lkb_nodeid == nodeid && lkb->lkb_remid == remid)
+ return lkb;
+ }
+ return NULL;
+}
+
+static struct dlm_lkb *search_remid(struct dlm_rsb *r, int nodeid,
+ uint32_t remid)
+{
+ struct dlm_lkb *lkb;
+
+ lkb = search_remid_list(&r->res_grantqueue, nodeid, remid);
+ if (lkb)
+ return lkb;
+ lkb = search_remid_list(&r->res_convertqueue, nodeid, remid);
+ if (lkb)
+ return lkb;
+ lkb = search_remid_list(&r->res_waitqueue, nodeid, remid);
+ if (lkb)
+ return lkb;
+ return NULL;
+}
+
+static int receive_rcom_lock_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
+ struct dlm_rsb *r, struct dlm_rcom *rc)
+{
+ struct rcom_lock *rl = (struct rcom_lock *) rc->rc_buf;
+ int lvblen;
+
+ lkb->lkb_nodeid = rc->rc_header.h_nodeid;
+ lkb->lkb_ownpid = rl->rl_ownpid;
+ lkb->lkb_remid = rl->rl_lkid;
+ lkb->lkb_exflags = rl->rl_exflags;
+ lkb->lkb_flags = rl->rl_flags & 0x0000FFFF;
+ lkb->lkb_flags |= DLM_IFL_MSTCPY;
+ lkb->lkb_lvbseq = rl->rl_lvbseq;
+ lkb->lkb_rqmode = rl->rl_rqmode;
+ lkb->lkb_grmode = rl->rl_grmode;
+ /* don't set lkb_status because add_lkb wants to itself */
+
+ lkb->lkb_bastaddr = (void *) (long) (rl->rl_asts & AST_BAST);
+ lkb->lkb_astaddr = (void *) (long) (rl->rl_asts & AST_COMP);
+
+ if (lkb->lkb_flags & DLM_IFL_RANGE) {
+ lkb->lkb_range = allocate_range(ls);
+ if (!lkb->lkb_range)
+ return -ENOMEM;
+ memcpy(lkb->lkb_range, rl->rl_range, 4*sizeof(uint64_t));
+ }
+
+ if (lkb->lkb_exflags & DLM_LKF_VALBLK) {
+ lkb->lkb_lvbptr = allocate_lvb(ls);
+ if (!lkb->lkb_lvbptr)
+ return -ENOMEM;
+ lvblen = rc->rc_header.h_length - sizeof(struct dlm_rcom) -
+ sizeof(struct rcom_lock);
+ memcpy(lkb->lkb_lvbptr, rl->rl_lvb, lvblen);
+ }
+
+ /* Conversions between PR and CW (middle modes) need special handling.
+ The real granted mode of these converting locks cannot be determined
+ until all locks have been rebuilt on the rsb (recover_conversion) */
+
+ if (rl->rl_wait_type == DLM_MSG_CONVERT && middle_conversion(lkb)) {
+ rl->rl_status = DLM_LKSTS_CONVERT;
+ lkb->lkb_grmode = DLM_LOCK_IV;
+ rsb_set_flag(r, RSB_RECOVER_CONVERT);
+ }
+
+ return 0;
+}
+
+/* This lkb may have been recovered in a previous aborted recovery so we need
+ to check if the rsb already has an lkb with the given remote nodeid/lkid.
+ If so we just send back a standard reply. If not, we create a new lkb with
+ the given values and send back our lkid. We send back our lkid by sending
+ back the rcom_lock struct we got but with the remid field filled in. */
+
+int dlm_recover_master_copy(struct dlm_ls *ls, struct dlm_rcom *rc)
+{
+ struct rcom_lock *rl = (struct rcom_lock *) rc->rc_buf;
+ struct dlm_rsb *r;
+ struct dlm_lkb *lkb;
+ int error;
+
+ if (rl->rl_parent_lkid) {
+ error = -EOPNOTSUPP;
+ goto out;
+ }
+
+ error = find_rsb(ls, rl->rl_name, rl->rl_namelen, R_MASTER, &r);
+ if (error)
+ goto out;
+
+ lock_rsb(r);
+
+ lkb = search_remid(r, rc->rc_header.h_nodeid, rl->rl_lkid);
+ if (lkb) {
+ error = -EEXIST;
+ goto out_remid;
+ }
+
+ error = create_lkb(ls, &lkb);
+ if (error)
+ goto out_unlock;
+
+ error = receive_rcom_lock_args(ls, lkb, r, rc);
+ if (error) {
+ put_lkb(lkb);
+ goto out_unlock;
+ }
+
+ attach_lkb(r, lkb);
+ add_lkb(r, lkb, rl->rl_status);
+ error = 0;
+
+ out_remid:
+ /* this is the new value returned to the lock holder for
+ saving in its process-copy lkb */
+ rl->rl_remid = lkb->lkb_id;
+
+ out_unlock:
+ unlock_rsb(r);
+ put_rsb(r);
+ out:
+ if (error)
+ log_print("recover_master_copy %d %x", error, rl->rl_lkid);
+ rl->rl_result = error;
+ return error;
+}
+
+int dlm_recover_process_copy(struct dlm_ls *ls, struct dlm_rcom *rc)
+{
+ struct rcom_lock *rl = (struct rcom_lock *) rc->rc_buf;
+ struct dlm_rsb *r;
+ struct dlm_lkb *lkb;
+ int error;
+
+ error = find_lkb(ls, rl->rl_lkid, &lkb);
+ if (error) {
+ log_error(ls, "recover_process_copy no lkid %x", rl->rl_lkid);
+ return error;
+ }
+
+ DLM_ASSERT(is_process_copy(lkb), dlm_print_lkb(lkb););
+
+ error = rl->rl_result;
+
+ r = lkb->lkb_resource;
+ hold_rsb(r);
+ lock_rsb(r);
+
+ switch (error) {
+ case -EEXIST:
+ log_debug(ls, "master copy exists %x", lkb->lkb_id);
+ /* fall through */
+ case 0:
+ lkb->lkb_remid = rl->rl_remid;
+ break;
+ default:
+ log_error(ls, "dlm_recover_process_copy unknown error %d %x",
+ error, lkb->lkb_id);
+ }
+
+ /* an ack for dlm_recover_locks() which waits for replies from
+ all the locks it sends to new masters */
+ dlm_recovered_lock(r);
+
+ unlock_rsb(r);
+ put_rsb(r);
+ put_lkb(lkb);
+
+ return 0;
+}
+
diff --git a/fs/dlm/lock.h b/fs/dlm/lock.h
new file mode 100644
index 0000000..9e6499f
--- /dev/null
+++ b/fs/dlm/lock.h
@@ -0,0 +1,50 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) 2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#ifndef __LOCK_DOT_H__
+#define __LOCK_DOT_H__
+
+void dlm_print_rsb(struct dlm_rsb *r);
+int dlm_receive_message(struct dlm_header *hd, int nodeid, int recovery);
+int dlm_modes_compat(int mode1, int mode2);
+int dlm_find_rsb(struct dlm_ls *ls, char *name, int namelen,
+ unsigned int flags, struct dlm_rsb **r_ret);
+void dlm_put_rsb(struct dlm_rsb *r);
+void dlm_hold_rsb(struct dlm_rsb *r);
+int dlm_put_lkb(struct dlm_lkb *lkb);
+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);
+int dlm_recover_master_copy(struct dlm_ls *ls, struct dlm_rcom *rc);
+int dlm_recover_process_copy(struct dlm_ls *ls, struct dlm_rcom *rc);
+
+static inline int is_master(struct dlm_rsb *r)
+{
+ return !r->res_nodeid;
+}
+
+static inline void lock_rsb(struct dlm_rsb *r)
+{
+ down(&r->res_sem);
+}
+
+static inline void unlock_rsb(struct dlm_rsb *r)
+{
+ up(&r->res_sem);
+}
+
+#endif
+
diff --git a/fs/dlm/lockspace.c b/fs/dlm/lockspace.c
new file mode 100644
index 0000000..fee4659
--- /dev/null
+++ b/fs/dlm/lockspace.c
@@ -0,0 +1,666 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#include "dlm_internal.h"
+#include "lockspace.h"
+#include "member.h"
+#include "recoverd.h"
+#include "ast.h"
+#include "dir.h"
+#include "lowcomms.h"
+#include "config.h"
+#include "memory.h"
+#include "lock.h"
+
+#ifdef CONFIG_DLM_DEBUG
+int dlm_create_debug_file(struct dlm_ls *ls);
+void dlm_delete_debug_file(struct dlm_ls *ls);
+#else
+static inline int dlm_create_debug_file(struct dlm_ls *ls) { return 0; }
+static inline void dlm_delete_debug_file(struct dlm_ls *ls) { }
+#endif
+
+static int ls_count;
+static struct semaphore ls_lock;
+static struct list_head lslist;
+static spinlock_t lslist_lock;
+static struct task_struct * scand_task;
+
+
+static ssize_t dlm_control_store(struct dlm_ls *ls, const char *buf, size_t len)
+{
+ ssize_t ret = len;
+ int n = simple_strtol(buf, NULL, 0);
+
+ switch (n) {
+ case 0:
+ dlm_ls_stop(ls);
+ break;
+ case 1:
+ dlm_ls_start(ls);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ return ret;
+}
+
+static ssize_t dlm_event_store(struct dlm_ls *ls, const char *buf, size_t len)
+{
+ ls->ls_uevent_result = simple_strtol(buf, NULL, 0);
+ set_bit(LSFL_UEVENT_WAIT, &ls->ls_flags);
+ wake_up(&ls->ls_uevent_wait);
+ return len;
+}
+
+static ssize_t dlm_id_show(struct dlm_ls *ls, char *buf)
+{
+ return sprintf(buf, "%u\n", ls->ls_global_id);
+}
+
+static ssize_t dlm_id_store(struct dlm_ls *ls, const char *buf, size_t len)
+{
+ ls->ls_global_id = simple_strtoul(buf, NULL, 0);
+ return len;
+}
+
+struct dlm_attr {
+ struct attribute attr;
+ ssize_t (*show)(struct dlm_ls *, char *);
+ ssize_t (*store)(struct dlm_ls *, const char *, size_t);
+};
+
+static struct dlm_attr dlm_attr_control = {
+ .attr = {.name = "control", .mode = S_IWUSR},
+ .store = dlm_control_store
+};
+
+static struct dlm_attr dlm_attr_event = {
+ .attr = {.name = "event_done", .mode = S_IWUSR},
+ .store = dlm_event_store
+};
+
+static struct dlm_attr dlm_attr_id = {
+ .attr = {.name = "id", .mode = S_IRUGO | S_IWUSR},
+ .show = dlm_id_show,
+ .store = dlm_id_store
+};
+
+static struct attribute *dlm_attrs[] = {
+ &dlm_attr_control.attr,
+ &dlm_attr_event.attr,
+ &dlm_attr_id.attr,
+ NULL,
+};
+
+static ssize_t dlm_attr_show(struct kobject *kobj, struct attribute *attr,
+ char *buf)
+{
+ struct dlm_ls *ls = container_of(kobj, struct dlm_ls, ls_kobj);
+ struct dlm_attr *a = container_of(attr, struct dlm_attr, attr);
+ return a->show ? a->show(ls, buf) : 0;
+}
+
+static ssize_t dlm_attr_store(struct kobject *kobj, struct attribute *attr,
+ const char *buf, size_t len)
+{
+ struct dlm_ls *ls = container_of(kobj, struct dlm_ls, ls_kobj);
+ struct dlm_attr *a = container_of(attr, struct dlm_attr, attr);
+ return a->store ? a->store(ls, buf, len) : len;
+}
+
+static struct sysfs_ops dlm_attr_ops = {
+ .show = dlm_attr_show,
+ .store = dlm_attr_store,
+};
+
+static struct kobj_type dlm_ktype = {
+ .default_attrs = dlm_attrs,
+ .sysfs_ops = &dlm_attr_ops,
+};
+
+static struct kset dlm_kset = {
+ .subsys = &kernel_subsys,
+ .kobj = {.name = "dlm",},
+ .ktype = &dlm_ktype,
+};
+
+static int kobject_setup(struct dlm_ls *ls)
+{
+ char lsname[DLM_LOCKSPACE_LEN];
+ int error;
+
+ memset(lsname, 0, DLM_LOCKSPACE_LEN);
+ snprintf(lsname, DLM_LOCKSPACE_LEN, "%s", ls->ls_name);
+
+ error = kobject_set_name(&ls->ls_kobj, "%s", lsname);
+ if (error)
+ return error;
+
+ ls->ls_kobj.kset = &dlm_kset;
+ ls->ls_kobj.ktype = &dlm_ktype;
+ return 0;
+}
+
+static int do_uevent(struct dlm_ls *ls, int in)
+{
+ int error;
+
+ if (in)
+ kobject_uevent(&ls->ls_kobj, KOBJ_ONLINE);
+ else
+ kobject_uevent(&ls->ls_kobj, KOBJ_OFFLINE);
+
+ error = wait_event_interruptible(ls->ls_uevent_wait,
+ test_and_clear_bit(LSFL_UEVENT_WAIT, &ls->ls_flags));
+ if (error)
+ goto out;
+
+ error = ls->ls_uevent_result;
+ out:
+ return error;
+}
+
+
+int dlm_lockspace_init(void)
+{
+ int error;
+
+ ls_count = 0;
+ init_MUTEX(&ls_lock);
+ INIT_LIST_HEAD(&lslist);
+ spin_lock_init(&lslist_lock);
+
+ error = kset_register(&dlm_kset);
+ if (error)
+ printk("dlm_lockspace_init: cannot register kset %d\n", error);
+ return error;
+}
+
+void dlm_lockspace_exit(void)
+{
+ kset_unregister(&dlm_kset);
+}
+
+static int dlm_scand(void *data)
+{
+ struct dlm_ls *ls;
+
+ while (!kthread_should_stop()) {
+ list_for_each_entry(ls, &lslist, ls_list)
+ dlm_scan_rsbs(ls);
+ schedule_timeout_interruptible(dlm_config.scan_secs * HZ);
+ }
+ return 0;
+}
+
+static int dlm_scand_start(void)
+{
+ struct task_struct *p;
+ int error = 0;
+
+ p = kthread_run(dlm_scand, NULL, "dlm_scand");
+ if (IS_ERR(p))
+ error = PTR_ERR(p);
+ else
+ scand_task = p;
+ return error;
+}
+
+static void dlm_scand_stop(void)
+{
+ kthread_stop(scand_task);
+}
+
+static struct dlm_ls *dlm_find_lockspace_name(char *name, int namelen)
+{
+ struct dlm_ls *ls;
+
+ spin_lock(&lslist_lock);
+
+ list_for_each_entry(ls, &lslist, ls_list) {
+ if (ls->ls_namelen == namelen &&
+ memcmp(ls->ls_name, name, namelen) == 0)
+ goto out;
+ }
+ ls = NULL;
+ out:
+ spin_unlock(&lslist_lock);
+ return ls;
+}
+
+struct dlm_ls *dlm_find_lockspace_global(uint32_t id)
+{
+ struct dlm_ls *ls;
+
+ spin_lock(&lslist_lock);
+
+ list_for_each_entry(ls, &lslist, ls_list) {
+ if (ls->ls_global_id == id) {
+ ls->ls_count++;
+ goto out;
+ }
+ }
+ ls = NULL;
+ out:
+ spin_unlock(&lslist_lock);
+ return ls;
+}
+
+struct dlm_ls *dlm_find_lockspace_local(void *id)
+{
+ struct dlm_ls *ls = id;
+
+ spin_lock(&lslist_lock);
+ ls->ls_count++;
+ spin_unlock(&lslist_lock);
+ return ls;
+}
+
+void dlm_put_lockspace(struct dlm_ls *ls)
+{
+ spin_lock(&lslist_lock);
+ ls->ls_count--;
+ spin_unlock(&lslist_lock);
+}
+
+static void remove_lockspace(struct dlm_ls *ls)
+{
+ for (;;) {
+ spin_lock(&lslist_lock);
+ if (ls->ls_count == 0) {
+ list_del(&ls->ls_list);
+ spin_unlock(&lslist_lock);
+ return;
+ }
+ spin_unlock(&lslist_lock);
+ ssleep(1);
+ }
+}
+
+static int threads_start(void)
+{
+ int error;
+
+ /* Thread which process lock requests for all lockspace's */
+ error = dlm_astd_start();
+ if (error) {
+ log_print("cannot start dlm_astd thread %d", error);
+ goto fail;
+ }
+
+ error = dlm_scand_start();
+ if (error) {
+ log_print("cannot start dlm_scand thread %d", error);
+ goto astd_fail;
+ }
+
+ /* Thread for sending/receiving messages for all lockspace's */
+ error = dlm_lowcomms_start();
+ if (error) {
+ log_print("cannot start dlm lowcomms %d", error);
+ goto scand_fail;
+ }
+
+ return 0;
+
+ scand_fail:
+ dlm_scand_stop();
+ astd_fail:
+ dlm_astd_stop();
+ fail:
+ return error;
+}
+
+static void threads_stop(void)
+{
+ dlm_scand_stop();
+ dlm_lowcomms_stop();
+ dlm_astd_stop();
+}
+
+static int new_lockspace(char *name, int namelen, void **lockspace,
+ uint32_t flags, int lvblen)
+{
+ struct dlm_ls *ls;
+ int i, size, error = -ENOMEM;
+
+ if (namelen > DLM_LOCKSPACE_LEN)
+ return -EINVAL;
+
+ if (!lvblen || (lvblen % 8))
+ return -EINVAL;
+
+ if (!try_module_get(THIS_MODULE))
+ return -EINVAL;
+
+ ls = dlm_find_lockspace_name(name, namelen);
+ if (ls) {
+ *lockspace = ls;
+ module_put(THIS_MODULE);
+ return -EEXIST;
+ }
+
+ ls = kmalloc(sizeof(struct dlm_ls) + namelen, GFP_KERNEL);
+ if (!ls)
+ goto out;
+ 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;
+
+ size = dlm_config.rsbtbl_size;
+ ls->ls_rsbtbl_size = size;
+
+ ls->ls_rsbtbl = kmalloc(sizeof(struct dlm_rsbtable) * size, GFP_KERNEL);
+ if (!ls->ls_rsbtbl)
+ goto out_lsfree;
+ for (i = 0; i < size; i++) {
+ INIT_LIST_HEAD(&ls->ls_rsbtbl[i].list);
+ INIT_LIST_HEAD(&ls->ls_rsbtbl[i].toss);
+ rwlock_init(&ls->ls_rsbtbl[i].lock);
+ }
+
+ size = dlm_config.lkbtbl_size;
+ ls->ls_lkbtbl_size = size;
+
+ ls->ls_lkbtbl = kmalloc(sizeof(struct dlm_lkbtable) * size, GFP_KERNEL);
+ if (!ls->ls_lkbtbl)
+ goto out_rsbfree;
+ for (i = 0; i < size; i++) {
+ INIT_LIST_HEAD(&ls->ls_lkbtbl[i].list);
+ rwlock_init(&ls->ls_lkbtbl[i].lock);
+ ls->ls_lkbtbl[i].counter = 1;
+ }
+
+ size = dlm_config.dirtbl_size;
+ ls->ls_dirtbl_size = size;
+
+ ls->ls_dirtbl = kmalloc(sizeof(struct dlm_dirtable) * size, GFP_KERNEL);
+ if (!ls->ls_dirtbl)
+ goto out_lkbfree;
+ for (i = 0; i < size; i++) {
+ INIT_LIST_HEAD(&ls->ls_dirtbl[i].list);
+ rwlock_init(&ls->ls_dirtbl[i].lock);
+ }
+
+ INIT_LIST_HEAD(&ls->ls_waiters);
+ init_MUTEX(&ls->ls_waiters_sem);
+
+ INIT_LIST_HEAD(&ls->ls_nodes);
+ INIT_LIST_HEAD(&ls->ls_nodes_gone);
+ ls->ls_num_nodes = 0;
+ ls->ls_low_nodeid = 0;
+ ls->ls_total_weight = 0;
+ ls->ls_node_array = NULL;
+
+ memset(&ls->ls_stub_rsb, 0, sizeof(struct dlm_rsb));
+ ls->ls_stub_rsb.res_ls = ls;
+
+ ls->ls_debug_dentry = NULL;
+
+ init_waitqueue_head(&ls->ls_uevent_wait);
+ ls->ls_uevent_result = 0;
+
+ ls->ls_recoverd_task = NULL;
+ init_MUTEX(&ls->ls_recoverd_active);
+ spin_lock_init(&ls->ls_recover_lock);
+ ls->ls_recover_status = 0;
+ ls->ls_recover_seq = 0;
+ ls->ls_recover_args = NULL;
+ init_rwsem(&ls->ls_in_recovery);
+ INIT_LIST_HEAD(&ls->ls_requestqueue);
+ init_MUTEX(&ls->ls_requestqueue_lock);
+
+ ls->ls_recover_buf = kmalloc(dlm_config.buffer_size, GFP_KERNEL);
+ if (!ls->ls_recover_buf)
+ goto out_dirfree;
+
+ INIT_LIST_HEAD(&ls->ls_recover_list);
+ spin_lock_init(&ls->ls_recover_list_lock);
+ ls->ls_recover_list_count = 0;
+ init_waitqueue_head(&ls->ls_wait_general);
+ INIT_LIST_HEAD(&ls->ls_root_list);
+ init_rwsem(&ls->ls_root_sem);
+
+ down_write(&ls->ls_in_recovery);
+
+ error = dlm_recoverd_start(ls);
+ if (error) {
+ log_error(ls, "can't start dlm_recoverd %d", error);
+ goto out_rcomfree;
+ }
+
+ spin_lock(&lslist_lock);
+ list_add(&ls->ls_list, &lslist);
+ spin_unlock(&lslist_lock);
+
+ dlm_create_debug_file(ls);
+
+ error = kobject_setup(ls);
+ if (error)
+ goto out_del;
+
+ error = kobject_register(&ls->ls_kobj);
+ if (error)
+ goto out_del;
+
+ error = do_uevent(ls, 1);
+ if (error)
+ goto out_unreg;
+
+ *lockspace = ls;
+ return 0;
+
+ out_unreg:
+ kobject_unregister(&ls->ls_kobj);
+ out_del:
+ dlm_delete_debug_file(ls);
+ spin_lock(&lslist_lock);
+ list_del(&ls->ls_list);
+ spin_unlock(&lslist_lock);
+ dlm_recoverd_stop(ls);
+ out_rcomfree:
+ kfree(ls->ls_recover_buf);
+ out_dirfree:
+ kfree(ls->ls_dirtbl);
+ out_lkbfree:
+ kfree(ls->ls_lkbtbl);
+ out_rsbfree:
+ kfree(ls->ls_rsbtbl);
+ out_lsfree:
+ kfree(ls);
+ out:
+ module_put(THIS_MODULE);
+ return error;
+}
+
+int dlm_new_lockspace(char *name, int namelen, void **lockspace,
+ uint32_t flags, int lvblen)
+{
+ int error = 0;
+
+ down(&ls_lock);
+ if (!ls_count)
+ error = threads_start();
+ if (error)
+ goto out;
+
+ error = new_lockspace(name, namelen, lockspace, flags, lvblen);
+ if (!error)
+ ls_count++;
+ out:
+ up(&ls_lock);
+ return error;
+}
+
+/* Return 1 if the lockspace still has active remote locks,
+ * 2 if the lockspace still has active local locks.
+ */
+static int lockspace_busy(struct dlm_ls *ls)
+{
+ int i, lkb_found = 0;
+ struct dlm_lkb *lkb;
+
+ /* NOTE: We check the lockidtbl here rather than the resource table.
+ This is because there may be LKBs queued as ASTs that have been
+ unlinked from their RSBs and are pending deletion once the AST has
+ been delivered */
+
+ for (i = 0; i < ls->ls_lkbtbl_size; i++) {
+ read_lock(&ls->ls_lkbtbl[i].lock);
+ if (!list_empty(&ls->ls_lkbtbl[i].list)) {
+ lkb_found = 1;
+ list_for_each_entry(lkb, &ls->ls_lkbtbl[i].list,
+ lkb_idtbl_list) {
+ if (!lkb->lkb_nodeid) {
+ read_unlock(&ls->ls_lkbtbl[i].lock);
+ return 2;
+ }
+ }
+ }
+ read_unlock(&ls->ls_lkbtbl[i].lock);
+ }
+ return lkb_found;
+}
+
+static int release_lockspace(struct dlm_ls *ls, int force)
+{
+ struct dlm_lkb *lkb;
+ struct dlm_rsb *rsb;
+ struct list_head *head;
+ int i;
+ int busy = lockspace_busy(ls);
+
+ if (busy > force)
+ return -EBUSY;
+
+ if (force < 3)
+ do_uevent(ls, 0);
+
+ dlm_recoverd_stop(ls);
+
+ remove_lockspace(ls);
+
+ dlm_delete_debug_file(ls);
+
+ dlm_astd_suspend();
+
+ kfree(ls->ls_recover_buf);
+
+ /*
+ * Free direntry structs.
+ */
+
+ dlm_dir_clear(ls);
+ kfree(ls->ls_dirtbl);
+
+ /*
+ * Free all lkb's on lkbtbl[] lists.
+ */
+
+ for (i = 0; i < ls->ls_lkbtbl_size; i++) {
+ head = &ls->ls_lkbtbl[i].list;
+ while (!list_empty(head)) {
+ lkb = list_entry(head->next, struct dlm_lkb,
+ lkb_idtbl_list);
+
+ list_del(&lkb->lkb_idtbl_list);
+
+ dlm_del_ast(lkb);
+
+ if (lkb->lkb_lvbptr && lkb->lkb_flags & DLM_IFL_MSTCPY)
+ free_lvb(lkb->lkb_lvbptr);
+
+ free_lkb(lkb);
+ }
+ }
+ dlm_astd_resume();
+
+ kfree(ls->ls_lkbtbl);
+
+ /*
+ * Free all rsb's on rsbtbl[] lists
+ */
+
+ for (i = 0; i < ls->ls_rsbtbl_size; i++) {
+ head = &ls->ls_rsbtbl[i].list;
+ while (!list_empty(head)) {
+ rsb = list_entry(head->next, struct dlm_rsb,
+ res_hashchain);
+
+ list_del(&rsb->res_hashchain);
+ free_rsb(rsb);
+ }
+
+ head = &ls->ls_rsbtbl[i].toss;
+ while (!list_empty(head)) {
+ rsb = list_entry(head->next, struct dlm_rsb,
+ res_hashchain);
+ list_del(&rsb->res_hashchain);
+ free_rsb(rsb);
+ }
+ }
+
+ kfree(ls->ls_rsbtbl);
+
+ /*
+ * Free structures on any other lists
+ */
+
+ kfree(ls->ls_recover_args);
+ dlm_clear_free_entries(ls);
+ dlm_clear_members(ls);
+ dlm_clear_members_gone(ls);
+ kfree(ls->ls_node_array);
+ kobject_unregister(&ls->ls_kobj);
+ kfree(ls);
+
+ down(&ls_lock);
+ ls_count--;
+ if (!ls_count)
+ threads_stop();
+ up(&ls_lock);
+
+ module_put(THIS_MODULE);
+ return 0;
+}
+
+/*
+ * Called when a system has released all its locks and is not going to use the
+ * lockspace any longer. We free everything we're managing for this lockspace.
+ * Remaining nodes will go through the recovery process as if we'd died. The
+ * lockspace must continue to function as usual, participating in recoveries,
+ * until this returns.
+ *
+ * Force has 4 possible values:
+ * 0 - don't destroy locksapce if it has any LKBs
+ * 1 - destroy lockspace if it has remote LKBs but not if it has local LKBs
+ * 2 - destroy lockspace regardless of LKBs
+ * 3 - destroy lockspace as part of a forced shutdown
+ */
+
+int dlm_release_lockspace(void *lockspace, int force)
+{
+ struct dlm_ls *ls;
+
+ ls = dlm_find_lockspace_local(lockspace);
+ if (!ls)
+ return -EINVAL;
+ dlm_put_lockspace(ls);
+ return release_lockspace(ls, force);
+}
+
diff --git a/fs/dlm/lockspace.h b/fs/dlm/lockspace.h
new file mode 100644
index 0000000..17bd3ba
--- /dev/null
+++ b/fs/dlm/lockspace.h
@@ -0,0 +1,24 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#ifndef __LOCKSPACE_DOT_H__
+#define __LOCKSPACE_DOT_H__
+
+int dlm_lockspace_init(void);
+void dlm_lockspace_exit(void);
+struct dlm_ls *dlm_find_lockspace_global(uint32_t id);
+struct dlm_ls *dlm_find_lockspace_local(void *id);
+void dlm_put_lockspace(struct dlm_ls *ls);
+
+#endif /* __LOCKSPACE_DOT_H__ */
+
diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
new file mode 100644
index 0000000..09b0124
--- /dev/null
+++ b/fs/dlm/lowcomms.c
@@ -0,0 +1,1218 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+/*
+ * lowcomms.c
+ *
+ * This is the "low-level" comms layer.
+ *
+ * It is responsible for sending/receiving messages
+ * from other nodes in the cluster.
+ *
+ * Cluster nodes are referred to by their nodeids. nodeids are
+ * simply 32 bit numbers to the locking module - if they need to
+ * be expanded for the cluster infrastructure then that is it's
+ * responsibility. It is this layer's
+ * responsibility to resolve these into IP address or
+ * whatever it needs for inter-node communication.
+ *
+ * The comms level is two kernel threads that deal mainly with
+ * the receiving of messages from other nodes and passing them
+ * up to the mid-level comms layer (which understands the
+ * message format) for execution by the locking core, and
+ * a send thread which does all the setting up of connections
+ * to remote nodes and the sending of data. Threads are not allowed
+ * to send their own data because it may cause them to wait in times
+ * of high load. Also, this way, the sending thread can collect together
+ * messages bound for one node and send them in one block.
+ *
+ * I don't see any problem with the recv thread executing the locking
+ * code on behalf of remote processes as the locking code is
+ * short, efficient and never (well, hardly ever) waits.
+ *
+ */
+
+#include <asm/ioctls.h>
+#include <net/sock.h>
+#include <net/tcp.h>
+#include <net/sctp/user.h>
+#include <linux/pagemap.h>
+#include <linux/socket.h>
+#include <linux/idr.h>
+
+#include "dlm_internal.h"
+#include "lowcomms.h"
+#include "config.h"
+#include "midcomms.h"
+
+static struct sockaddr_storage *local_addr[DLM_MAX_ADDR_COUNT];
+static int local_count;
+static int local_nodeid;
+
+/* One of these per connected node */
+
+#define NI_INIT_PENDING 1
+#define NI_WRITE_PENDING 2
+
+struct nodeinfo {
+ spinlock_t lock;
+ sctp_assoc_t assoc_id;
+ unsigned long flags;
+ struct list_head write_list; /* nodes with pending writes */
+ struct list_head writequeue; /* outgoing writequeue_entries */
+ spinlock_t writequeue_lock;
+ int nodeid;
+};
+
+static DEFINE_IDR(nodeinfo_idr);
+static struct rw_semaphore nodeinfo_lock;
+static int max_nodeid;
+
+struct cbuf {
+ unsigned base;
+ unsigned len;
+ unsigned mask;
+};
+
+/* Just the one of these, now. But this struct keeps
+ the connection-specific variables together */
+
+#define CF_READ_PENDING 1
+
+struct connection {
+ struct socket *sock;
+ unsigned long flags;
+ struct page *rx_page;
+ atomic_t waiting_requests;
+ struct cbuf cb;
+ int eagain_flag;
+};
+
+/* An entry waiting to be sent */
+
+struct writequeue_entry {
+ struct list_head list;
+ struct page *page;
+ int offset;
+ int len;
+ int end;
+ int users;
+ struct nodeinfo *ni;
+};
+
+#define CBUF_ADD(cb, n) do { (cb)->len += n; } while(0)
+#define CBUF_EMPTY(cb) ((cb)->len == 0)
+#define CBUF_MAY_ADD(cb, n) (((cb)->len + (n)) < ((cb)->mask + 1))
+#define CBUF_DATA(cb) (((cb)->base + (cb)->len) & (cb)->mask)
+
+#define CBUF_INIT(cb, size) \
+do { \
+ (cb)->base = (cb)->len = 0; \
+ (cb)->mask = ((size)-1); \
+} while(0)
+
+#define CBUF_EAT(cb, n) \
+do { \
+ (cb)->len -= (n); \
+ (cb)->base += (n); \
+ (cb)->base &= (cb)->mask; \
+} while(0)
+
+
+/* List of nodes which have writes pending */
+static struct list_head write_nodes;
+static spinlock_t write_nodes_lock;
+
+/* Maximum number of incoming messages to process before
+ * doing a schedule()
+ */
+#define MAX_RX_MSG_COUNT 25
+
+/* Manage daemons */
+static struct task_struct *recv_task;
+static struct task_struct *send_task;
+static wait_queue_head_t lowcomms_recv_wait;
+static atomic_t accepting;
+
+/* The SCTP connection */
+static struct connection sctp_con;
+
+
+static int nodeid_to_addr(int nodeid, struct sockaddr *retaddr)
+{
+ struct sockaddr_storage addr;
+ int error;
+
+ if (!local_count)
+ return -1;
+
+ error = dlm_nodeid_to_addr(nodeid, &addr);
+ if (error)
+ return error;
+
+ if (local_addr[0]->ss_family == AF_INET) {
+ struct sockaddr_in *in4 = (struct sockaddr_in *) &addr;
+ struct sockaddr_in *ret4 = (struct sockaddr_in *) retaddr;
+ ret4->sin_addr.s_addr = in4->sin_addr.s_addr;
+ } else {
+ struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &addr;
+ struct sockaddr_in6 *ret6 = (struct sockaddr_in6 *) retaddr;
+ memcpy(&ret6->sin6_addr, &in6->sin6_addr,
+ sizeof(in6->sin6_addr));
+ }
+
+ return 0;
+}
+
+static struct nodeinfo *nodeid2nodeinfo(int nodeid, int alloc)
+{
+ struct nodeinfo *ni;
+ int r;
+ int n;
+
+ down_read(&nodeinfo_lock);
+ ni = idr_find(&nodeinfo_idr, nodeid);
+ up_read(&nodeinfo_lock);
+
+ if (!ni && alloc) {
+ down_write(&nodeinfo_lock);
+
+ ni = idr_find(&nodeinfo_idr, nodeid);
+ if (ni)
+ goto out_up;
+
+ r = idr_pre_get(&nodeinfo_idr, alloc);
+ if (!r)
+ goto out_up;
+
+ ni = kmalloc(sizeof(struct nodeinfo), alloc);
+ if (!ni)
+ goto out_up;
+
+ r = idr_get_new_above(&nodeinfo_idr, ni, nodeid, &n);
+ if (r) {
+ kfree(ni);
+ ni = NULL;
+ goto out_up;
+ }
+ if (n != nodeid) {
+ idr_remove(&nodeinfo_idr, n);
+ kfree(ni);
+ ni = NULL;
+ goto out_up;
+ }
+ memset(ni, 0, sizeof(struct nodeinfo));
+ spin_lock_init(&ni->lock);
+ INIT_LIST_HEAD(&ni->writequeue);
+ spin_lock_init(&ni->writequeue_lock);
+ ni->nodeid = nodeid;
+
+ if (nodeid > max_nodeid)
+ max_nodeid = nodeid;
+ out_up:
+ up_write(&nodeinfo_lock);
+ }
+
+ return ni;
+}
+
+/* Don't call this too often... */
+static struct nodeinfo *assoc2nodeinfo(sctp_assoc_t assoc)
+{
+ int i;
+ struct nodeinfo *ni;
+
+ for (i=1; i<=max_nodeid; i++) {
+ ni = nodeid2nodeinfo(i, 0);
+ if (ni && ni->assoc_id == assoc)
+ return ni;
+ }
+ return NULL;
+}
+
+/* Data or notification available on socket */
+static void lowcomms_data_ready(struct sock *sk, int count_unused)
+{
+ atomic_inc(&sctp_con.waiting_requests);
+ if (test_and_set_bit(CF_READ_PENDING, &sctp_con.flags))
+ return;
+
+ wake_up_interruptible(&lowcomms_recv_wait);
+}
+
+
+/* Add the port number to an IP6 or 4 sockaddr and return the address length.
+ Also padd out the struct with zeros to make comparisons meaningful */
+
+static void make_sockaddr(struct sockaddr_storage *saddr, uint16_t port,
+ int *addr_len)
+{
+ struct sockaddr_in *local4_addr;
+ struct sockaddr_in6 *local6_addr;
+
+ if (!local_count)
+ return;
+
+ if (!port) {
+ if (local_addr[0]->ss_family == AF_INET) {
+ local4_addr = (struct sockaddr_in *)local_addr[0];
+ port = be16_to_cpu(local4_addr->sin_port);
+ } else {
+ local6_addr = (struct sockaddr_in6 *)local_addr[0];
+ port = be16_to_cpu(local6_addr->sin6_port);
+ }
+ }
+
+ saddr->ss_family = local_addr[0]->ss_family;
+ if (local_addr[0]->ss_family == AF_INET) {
+ struct sockaddr_in *in4_addr = (struct sockaddr_in *)saddr;
+ in4_addr->sin_port = cpu_to_be16(port);
+ memset(&in4_addr->sin_zero, 0, sizeof(in4_addr->sin_zero));
+ memset(in4_addr+1, 0, sizeof(struct sockaddr_storage) -
+ sizeof(struct sockaddr_in));
+ *addr_len = sizeof(struct sockaddr_in);
+ } else {
+ struct sockaddr_in6 *in6_addr = (struct sockaddr_in6 *)saddr;
+ in6_addr->sin6_port = cpu_to_be16(port);
+ memset(in6_addr+1, 0, sizeof(struct sockaddr_storage) -
+ sizeof(struct sockaddr_in6));
+ *addr_len = sizeof(struct sockaddr_in6);
+ }
+}
+
+/* Close the connection and tidy up */
+static void close_connection(void)
+{
+ if (sctp_con.sock) {
+ sock_release(sctp_con.sock);
+ sctp_con.sock = NULL;
+ }
+
+ if (sctp_con.rx_page) {
+ __free_page(sctp_con.rx_page);
+ sctp_con.rx_page = NULL;
+ }
+}
+
+/* We only send shutdown messages to nodes that are not part of the cluster */
+static void send_shutdown(sctp_assoc_t associd)
+{
+ static char outcmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))];
+ struct msghdr outmessage;
+ struct cmsghdr *cmsg;
+ struct sctp_sndrcvinfo *sinfo;
+ int ret;
+
+ outmessage.msg_name = NULL;
+ outmessage.msg_namelen = 0;
+ outmessage.msg_control = outcmsg;
+ outmessage.msg_controllen = sizeof(outcmsg);
+ outmessage.msg_flags = MSG_EOR;
+
+ cmsg = CMSG_FIRSTHDR(&outmessage);
+ cmsg->cmsg_level = IPPROTO_SCTP;
+ cmsg->cmsg_type = SCTP_SNDRCV;
+ cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
+ outmessage.msg_controllen = cmsg->cmsg_len;
+ sinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
+ memset(sinfo, 0x00, sizeof(struct sctp_sndrcvinfo));
+
+ sinfo->sinfo_flags |= MSG_EOF;
+ sinfo->sinfo_assoc_id = associd;
+
+ ret = kernel_sendmsg(sctp_con.sock, &outmessage, NULL, 0, 0);
+
+ if (ret != 0)
+ log_print("send EOF to node failed: %d", ret);
+}
+
+
+/* INIT failed but we don't know which node...
+ restart INIT on all pending nodes */
+static void init_failed(void)
+{
+ int i;
+ struct nodeinfo *ni;
+
+ for (i=1; i<=max_nodeid; i++) {
+ ni = nodeid2nodeinfo(i, 0);
+ if (!ni)
+ continue;
+
+ if (test_and_clear_bit(NI_INIT_PENDING, &ni->flags)) {
+ ni->assoc_id = 0;
+ if (!test_and_set_bit(NI_WRITE_PENDING, &ni->flags)) {
+ spin_lock_bh(&write_nodes_lock);
+ list_add_tail(&ni->write_list, &write_nodes);
+ spin_unlock_bh(&write_nodes_lock);
+ }
+ }
+ }
+ wake_up_process(send_task);
+}
+
+/* Something happened to an association */
+static void process_sctp_notification(struct msghdr *msg, char *buf)
+{
+ union sctp_notification *sn = (union sctp_notification *)buf;
+
+ if (sn->sn_header.sn_type == SCTP_ASSOC_CHANGE) {
+ switch (sn->sn_assoc_change.sac_state) {
+
+ case SCTP_COMM_UP:
+ case SCTP_RESTART:
+ {
+ /* Check that the new node is in the lockspace */
+ struct sctp_prim prim;
+ mm_segment_t fs;
+ int nodeid;
+ int prim_len, ret;
+ int addr_len;
+ struct nodeinfo *ni;
+
+ /* This seems to happen when we received a connection
+ * too early... or something... anyway, it happens but
+ * we always seem to get a real message too, see
+ * receive_from_sock */
+
+ if ((int)sn->sn_assoc_change.sac_assoc_id <= 0) {
+ log_print("COMM_UP for invalid assoc ID %d",
+ (int)sn->sn_assoc_change.sac_assoc_id);
+ init_failed();
+ return;
+ }
+ memset(&prim, 0, sizeof(struct sctp_prim));
+ prim_len = sizeof(struct sctp_prim);
+ prim.ssp_assoc_id = sn->sn_assoc_change.sac_assoc_id;
+
+ fs = get_fs();
+ set_fs(get_ds());
+ ret = sctp_con.sock->ops->getsockopt(sctp_con.sock,
+ IPPROTO_SCTP, SCTP_PRIMARY_ADDR,
+ (char*)&prim, &prim_len);
+ set_fs(fs);
+ if (ret < 0) {
+ struct nodeinfo *ni;
+
+ log_print("getsockopt/sctp_primary_addr on "
+ "new assoc %d failed : %d",
+ (int)sn->sn_assoc_change.sac_assoc_id, ret);
+
+ /* Retry INIT later */
+ ni = assoc2nodeinfo(sn->sn_assoc_change.sac_assoc_id);
+ if (ni)
+ clear_bit(NI_INIT_PENDING, &ni->flags);
+ return;
+ }
+ make_sockaddr(&prim.ssp_addr, 0, &addr_len);
+ if (dlm_addr_to_nodeid(&prim.ssp_addr, &nodeid)) {
+ log_print("reject connect from unknown addr");
+ send_shutdown(prim.ssp_assoc_id);
+ return;
+ }
+
+ ni = nodeid2nodeinfo(nodeid, GFP_KERNEL);
+ if (!ni)
+ return;
+
+ /* Save the assoc ID */
+ spin_lock(&ni->lock);
+ ni->assoc_id = sn->sn_assoc_change.sac_assoc_id;
+ spin_unlock(&ni->lock);
+
+ log_print("got new/restarted association %d nodeid %d",
+ (int)sn->sn_assoc_change.sac_assoc_id, nodeid);
+
+ /* Send any pending writes */
+ clear_bit(NI_INIT_PENDING, &ni->flags);
+ if (!test_and_set_bit(NI_WRITE_PENDING, &ni->flags)) {
+ spin_lock_bh(&write_nodes_lock);
+ list_add_tail(&ni->write_list, &write_nodes);
+ spin_unlock_bh(&write_nodes_lock);
+ }
+ wake_up_process(send_task);
+ }
+ break;
+
+ case SCTP_COMM_LOST:
+ case SCTP_SHUTDOWN_COMP:
+ {
+ struct nodeinfo *ni;
+
+ ni = assoc2nodeinfo(sn->sn_assoc_change.sac_assoc_id);
+ if (ni) {
+ spin_lock(&ni->lock);
+ ni->assoc_id = 0;
+ spin_unlock(&ni->lock);
+ }
+ }
+ break;
+
+ /* We don't know which INIT failed, so clear the PENDING flags
+ * on them all. if assoc_id is zero then it will then try
+ * again */
+
+ case SCTP_CANT_STR_ASSOC:
+ {
+ log_print("Can't start SCTP association - retrying");
+ init_failed();
+ }
+ break;
+
+ default:
+ log_print("unexpected SCTP assoc change id=%d state=%d",
+ (int)sn->sn_assoc_change.sac_assoc_id,
+ sn->sn_assoc_change.sac_state);
+ }
+ }
+}
+
+/* Data received from remote end */
+static int receive_from_sock(void)
+{
+ int ret = 0;
+ struct msghdr msg;
+ struct kvec iov[2];
+ unsigned len;
+ int r;
+ struct sctp_sndrcvinfo *sinfo;
+ struct cmsghdr *cmsg;
+ struct nodeinfo *ni;
+
+ /* These two are marginally too big for stack allocation, but this
+ * function is (currently) only called by dlm_recvd so static should be
+ * OK.
+ */
+ static struct sockaddr_storage msgname;
+ static char incmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))];
+
+ if (sctp_con.sock == NULL)
+ goto out;
+
+ if (sctp_con.rx_page == NULL) {
+ /*
+ * This doesn't need to be atomic, but I think it should
+ * improve performance if it is.
+ */
+ sctp_con.rx_page = alloc_page(GFP_ATOMIC);
+ if (sctp_con.rx_page == NULL)
+ goto out_resched;
+ CBUF_INIT(&sctp_con.cb, PAGE_CACHE_SIZE);
+ }
+
+ memset(&incmsg, 0, sizeof(incmsg));
+ memset(&msgname, 0, sizeof(msgname));
+
+ memset(incmsg, 0, sizeof(incmsg));
+ msg.msg_name = &msgname;
+ msg.msg_namelen = sizeof(msgname);
+ msg.msg_flags = 0;
+ msg.msg_control = incmsg;
+ msg.msg_controllen = sizeof(incmsg);
+
+ /* I don't see why this circular buffer stuff is necessary for SCTP
+ * which is a packet-based protocol, but the whole thing breaks under
+ * load without it! The overhead is minimal (and is in the TCP lowcomms
+ * anyway, of course) so I'll leave it in until I can figure out what's
+ * really happening.
+ */
+
+ /*
+ * iov[0] is the bit of the circular buffer between the current end
+ * point (cb.base + cb.len) and the end of the buffer.
+ */
+ iov[0].iov_len = sctp_con.cb.base - CBUF_DATA(&sctp_con.cb);
+ iov[0].iov_base = page_address(sctp_con.rx_page) +
+ CBUF_DATA(&sctp_con.cb);
+ iov[1].iov_len = 0;
+
+ /*
+ * iov[1] is the bit of the circular buffer between the start of the
+ * buffer and the start of the currently used section (cb.base)
+ */
+ if (CBUF_DATA(&sctp_con.cb) >= sctp_con.cb.base) {
+ iov[0].iov_len = PAGE_CACHE_SIZE - CBUF_DATA(&sctp_con.cb);
+ iov[1].iov_len = sctp_con.cb.base;
+ iov[1].iov_base = page_address(sctp_con.rx_page);
+ msg.msg_iovlen = 2;
+ }
+ len = iov[0].iov_len + iov[1].iov_len;
+
+ r = ret = kernel_recvmsg(sctp_con.sock, &msg, iov, 1, len,
+ MSG_NOSIGNAL | MSG_DONTWAIT);
+ if (ret <= 0)
+ goto out_close;
+
+ msg.msg_control = incmsg;
+ msg.msg_controllen = sizeof(incmsg);
+ cmsg = CMSG_FIRSTHDR(&msg);
+ sinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
+
+ if (msg.msg_flags & MSG_NOTIFICATION) {
+ process_sctp_notification(&msg, page_address(sctp_con.rx_page));
+ return 0;
+ }
+
+ /* Is this a new association ? */
+ ni = nodeid2nodeinfo(le32_to_cpu(sinfo->sinfo_ppid), GFP_KERNEL);
+ if (ni) {
+ ni->assoc_id = sinfo->sinfo_assoc_id;
+ if (test_and_clear_bit(NI_INIT_PENDING, &ni->flags)) {
+
+ if (!test_and_set_bit(NI_WRITE_PENDING, &ni->flags)) {
+ spin_lock_bh(&write_nodes_lock);
+ list_add_tail(&ni->write_list, &write_nodes);
+ spin_unlock_bh(&write_nodes_lock);
+ }
+ wake_up_process(send_task);
+ }
+ }
+
+ /* INIT sends a message with length of 1 - ignore it */
+ if (r == 1)
+ return 0;
+
+ CBUF_ADD(&sctp_con.cb, ret);
+ ret = dlm_process_incoming_buffer(cpu_to_le32(sinfo->sinfo_ppid),
+ page_address(sctp_con.rx_page),
+ sctp_con.cb.base, sctp_con.cb.len,
+ PAGE_CACHE_SIZE);
+ if (ret < 0)
+ goto out_close;
+ CBUF_EAT(&sctp_con.cb, ret);
+
+ out:
+ ret = 0;
+ goto out_ret;
+
+ out_resched:
+ lowcomms_data_ready(sctp_con.sock->sk, 0);
+ ret = 0;
+ schedule();
+ goto out_ret;
+
+ out_close:
+ if (ret != -EAGAIN)
+ log_print("error reading from sctp socket: %d", ret);
+ out_ret:
+ return ret;
+}
+
+/* Bind to an IP address. SCTP allows multiple address so it can do multi-homing */
+static int add_bind_addr(struct sockaddr_storage *addr, int addr_len, int num)
+{
+ mm_segment_t fs;
+ int result = 0;
+
+ fs = get_fs();
+ set_fs(get_ds());
+ if (num == 1)
+ result = sctp_con.sock->ops->bind(sctp_con.sock,
+ (struct sockaddr *) addr, addr_len);
+ else
+ result = sctp_con.sock->ops->setsockopt(sctp_con.sock, SOL_SCTP,
+ SCTP_SOCKOPT_BINDX_ADD, (char *)addr, addr_len);
+ set_fs(fs);
+
+ if (result < 0)
+ log_print("Can't bind to port %d addr number %d",
+ dlm_config.tcp_port, num);
+
+ return result;
+}
+
+static void init_local(void)
+{
+ struct sockaddr_storage sas, *addr;
+ int i;
+
+ local_nodeid = dlm_our_nodeid();
+
+ for (i = 0; i < DLM_MAX_ADDR_COUNT - 1; i++) {
+ if (dlm_our_addr(&sas, i))
+ break;
+
+ addr = kmalloc(sizeof(*addr), GFP_KERNEL);
+ if (!addr)
+ break;
+ memcpy(addr, &sas, sizeof(*addr));
+ local_addr[local_count++] = addr;
+ }
+}
+
+/* Initialise SCTP socket and bind to all interfaces */
+static int init_sock(void)
+{
+ mm_segment_t fs;
+ struct socket *sock = NULL;
+ struct sockaddr_storage localaddr;
+ struct sctp_event_subscribe subscribe;
+ int result = -EINVAL, num = 1, i, addr_len;
+
+ if (!local_count) {
+ init_local();
+ if (!local_count) {
+ log_print("no local IP address has been set");
+ goto out;
+ }
+ }
+
+ result = sock_create_kern(local_addr[0]->ss_family, SOCK_SEQPACKET,
+ IPPROTO_SCTP, &sock);
+ if (result < 0) {
+ log_print("Can't create comms socket, check SCTP is loaded");
+ goto out;
+ }
+
+ /* Listen for events */
+ memset(&subscribe, 0, sizeof(subscribe));
+ subscribe.sctp_data_io_event = 1;
+ subscribe.sctp_association_event = 1;
+ subscribe.sctp_send_failure_event = 1;
+ subscribe.sctp_shutdown_event = 1;
+ subscribe.sctp_partial_delivery_event = 1;
+
+ fs = get_fs();
+ set_fs(get_ds());
+ result = sock->ops->setsockopt(sock, SOL_SCTP, SCTP_EVENTS,
+ (char *)&subscribe, sizeof(subscribe));
+ set_fs(fs);
+
+ if (result < 0) {
+ log_print("Failed to set SCTP_EVENTS on socket: result=%d",
+ result);
+ goto create_delsock;
+ }
+
+ /* Init con struct */
+ sock->sk->sk_user_data = &sctp_con;
+ sctp_con.sock = sock;
+ sctp_con.sock->sk->sk_data_ready = lowcomms_data_ready;
+
+ /* Bind to all interfaces. */
+ for (i = 0; i < local_count; i++) {
+ memcpy(&localaddr, local_addr[i], sizeof(localaddr));
+ make_sockaddr(&localaddr, dlm_config.tcp_port, &addr_len);
+
+ result = add_bind_addr(&localaddr, addr_len, num);
+ if (result)
+ goto create_delsock;
+ ++num;
+ }
+
+ result = sock->ops->listen(sock, 5);
+ if (result < 0) {
+ log_print("Can't set socket listening");
+ goto create_delsock;
+ }
+
+ return 0;
+
+ create_delsock:
+ sock_release(sock);
+ sctp_con.sock = NULL;
+ out:
+ return result;
+}
+
+
+static struct writequeue_entry *new_writequeue_entry(int allocation)
+{
+ struct writequeue_entry *entry;
+
+ entry = kmalloc(sizeof(struct writequeue_entry), allocation);
+ if (!entry)
+ return NULL;
+
+ entry->page = alloc_page(allocation);
+ if (!entry->page) {
+ kfree(entry);
+ return NULL;
+ }
+
+ entry->offset = 0;
+ entry->len = 0;
+ entry->end = 0;
+ entry->users = 0;
+
+ return entry;
+}
+
+void *dlm_lowcomms_get_buffer(int nodeid, int len, int allocation, char **ppc)
+{
+ struct writequeue_entry *e;
+ int offset = 0;
+ int users = 0;
+ struct nodeinfo *ni;
+
+ if (!atomic_read(&accepting))
+ return NULL;
+
+ ni = nodeid2nodeinfo(nodeid, allocation);
+ if (!ni)
+ return NULL;
+
+ spin_lock(&ni->writequeue_lock);
+ e = list_entry(ni->writequeue.prev, struct writequeue_entry, list);
+ if (((struct list_head *) e == &ni->writequeue) ||
+ (PAGE_CACHE_SIZE - e->end < len)) {
+ e = NULL;
+ } else {
+ offset = e->end;
+ e->end += len;
+ users = e->users++;
+ }
+ spin_unlock(&ni->writequeue_lock);
+
+ if (e) {
+ got_one:
+ if (users == 0)
+ kmap(e->page);
+ *ppc = page_address(e->page) + offset;
+ return e;
+ }
+
+ e = new_writequeue_entry(allocation);
+ if (e) {
+ spin_lock(&ni->writequeue_lock);
+ offset = e->end;
+ e->end += len;
+ e->ni = ni;
+ users = e->users++;
+ list_add_tail(&e->list, &ni->writequeue);
+ spin_unlock(&ni->writequeue_lock);
+ goto got_one;
+ }
+ return NULL;
+}
+
+void dlm_lowcomms_commit_buffer(void *arg)
+{
+ struct writequeue_entry *e = (struct writequeue_entry *) arg;
+ int users;
+ struct nodeinfo *ni = e->ni;
+
+ if (!atomic_read(&accepting))
+ return;
+
+ spin_lock(&ni->writequeue_lock);
+ users = --e->users;
+ if (users)
+ goto out;
+ e->len = e->end - e->offset;
+ kunmap(e->page);
+ spin_unlock(&ni->writequeue_lock);
+
+ if (!test_and_set_bit(NI_WRITE_PENDING, &ni->flags)) {
+ spin_lock_bh(&write_nodes_lock);
+ list_add_tail(&ni->write_list, &write_nodes);
+ spin_unlock_bh(&write_nodes_lock);
+ wake_up_process(send_task);
+ }
+ return;
+
+ out:
+ spin_unlock(&ni->writequeue_lock);
+ return;
+}
+
+static void free_entry(struct writequeue_entry *e)
+{
+ __free_page(e->page);
+ kfree(e);
+}
+
+/* Initiate an SCTP association. In theory we could just use sendmsg() on
+ the first IP address and it should work, but this allows us to set up the
+ association before sending any valuable data that we can't afford to lose.
+ It also keeps the send path clean as it can now always use the association ID */
+static void initiate_association(int nodeid)
+{
+ struct sockaddr_storage rem_addr;
+ static char outcmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))];
+ struct msghdr outmessage;
+ struct cmsghdr *cmsg;
+ struct sctp_sndrcvinfo *sinfo;
+ int ret;
+ int addrlen;
+ char buf[1];
+ struct kvec iov[1];
+ struct nodeinfo *ni;
+
+ log_print("Initiating association with node %d", nodeid);
+
+ ni = nodeid2nodeinfo(nodeid, GFP_KERNEL);
+ if (!ni)
+ return;
+
+ if (nodeid_to_addr(nodeid, (struct sockaddr *)&rem_addr)) {
+ log_print("no address for nodeid %d", nodeid);
+ return;
+ }
+
+ make_sockaddr(&rem_addr, dlm_config.tcp_port, &addrlen);
+
+ outmessage.msg_name = &rem_addr;
+ outmessage.msg_namelen = addrlen;
+ outmessage.msg_control = outcmsg;
+ outmessage.msg_controllen = sizeof(outcmsg);
+ outmessage.msg_flags = MSG_EOR;
+
+ iov[0].iov_base = buf;
+ iov[0].iov_len = 1;
+
+ /* Real INIT messages seem to cause trouble. Just send a 1 byte message
+ we can afford to lose */
+ cmsg = CMSG_FIRSTHDR(&outmessage);
+ cmsg->cmsg_level = IPPROTO_SCTP;
+ cmsg->cmsg_type = SCTP_SNDRCV;
+ cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
+ sinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
+ memset(sinfo, 0x00, sizeof(struct sctp_sndrcvinfo));
+ sinfo->sinfo_ppid = cpu_to_le32(local_nodeid);
+
+ outmessage.msg_controllen = cmsg->cmsg_len;
+ ret = kernel_sendmsg(sctp_con.sock, &outmessage, iov, 1, 1);
+ if (ret < 0) {
+ log_print("send INIT to node failed: %d", ret);
+ /* Try again later */
+ clear_bit(NI_INIT_PENDING, &ni->flags);
+ }
+}
+
+/* Send a message */
+static int send_to_sock(struct nodeinfo *ni)
+{
+ int ret = 0;
+ struct writequeue_entry *e;
+ int len, offset;
+ struct msghdr outmsg;
+ static char outcmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))];
+ struct cmsghdr *cmsg;
+ struct sctp_sndrcvinfo *sinfo;
+ struct kvec iov;
+
+ /* See if we need to init an association before we start
+ sending precious messages */
+ spin_lock(&ni->lock);
+ if (!ni->assoc_id && !test_and_set_bit(NI_INIT_PENDING, &ni->flags)) {
+ spin_unlock(&ni->lock);
+ initiate_association(ni->nodeid);
+ return 0;
+ }
+ spin_unlock(&ni->lock);
+
+ outmsg.msg_name = NULL; /* We use assoc_id */
+ outmsg.msg_namelen = 0;
+ outmsg.msg_control = outcmsg;
+ outmsg.msg_controllen = sizeof(outcmsg);
+ outmsg.msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL | MSG_EOR;
+
+ cmsg = CMSG_FIRSTHDR(&outmsg);
+ cmsg->cmsg_level = IPPROTO_SCTP;
+ cmsg->cmsg_type = SCTP_SNDRCV;
+ cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
+ sinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
+ memset(sinfo, 0x00, sizeof(struct sctp_sndrcvinfo));
+ sinfo->sinfo_ppid = cpu_to_le32(local_nodeid);
+ sinfo->sinfo_assoc_id = ni->assoc_id;
+ outmsg.msg_controllen = cmsg->cmsg_len;
+
+ spin_lock(&ni->writequeue_lock);
+ for (;;) {
+ if (list_empty(&ni->writequeue))
+ break;
+ e = list_entry(ni->writequeue.next, struct writequeue_entry,
+ list);
+ kmap(e->page);
+ len = e->len;
+ offset = e->offset;
+ BUG_ON(len == 0 && e->users == 0);
+ spin_unlock(&ni->writequeue_lock);
+
+ ret = 0;
+ if (len) {
+ iov.iov_base = page_address(e->page)+offset;
+ iov.iov_len = len;
+
+ ret = kernel_sendmsg(sctp_con.sock, &outmsg, &iov, 1,
+ len);
+ if (ret == -EAGAIN) {
+ sctp_con.eagain_flag = 1;
+ goto out;
+ } else if (ret < 0)
+ goto send_error;
+ } else {
+ /* Don't starve people filling buffers */
+ schedule();
+ }
+
+ spin_lock(&ni->writequeue_lock);
+ e->offset += ret;
+ e->len -= ret;
+
+ if (e->len == 0 && e->users == 0) {
+ list_del(&e->list);
+ free_entry(e);
+ continue;
+ }
+ }
+ spin_unlock(&ni->writequeue_lock);
+ out:
+ return ret;
+
+ send_error:
+ log_print("Error sending to node %d %d", ni->nodeid, ret);
+ spin_lock(&ni->lock);
+ if (!test_and_set_bit(NI_INIT_PENDING, &ni->flags)) {
+ ni->assoc_id = 0;
+ spin_unlock(&ni->lock);
+ initiate_association(ni->nodeid);
+ } else
+ spin_unlock(&ni->lock);
+
+ return ret;
+}
+
+/* Try to send any messages that are pending */
+static void process_output_queue(void)
+{
+ struct list_head *list;
+ struct list_head *temp;
+
+ spin_lock_bh(&write_nodes_lock);
+ list_for_each_safe(list, temp, &write_nodes) {
+ struct nodeinfo *ni =
+ list_entry(list, struct nodeinfo, write_list);
+ clear_bit(NI_WRITE_PENDING, &ni->flags);
+ list_del(&ni->write_list);
+
+ spin_unlock_bh(&write_nodes_lock);
+
+ send_to_sock(ni);
+ spin_lock_bh(&write_nodes_lock);
+ }
+ spin_unlock_bh(&write_nodes_lock);
+}
+
+/* Called after we've had -EAGAIN and been woken up */
+static void refill_write_queue(void)
+{
+ int i;
+
+ for (i=1; i<=max_nodeid; i++) {
+ struct nodeinfo *ni = nodeid2nodeinfo(i, 0);
+
+ if (ni) {
+ if (!test_and_set_bit(NI_WRITE_PENDING, &ni->flags)) {
+ spin_lock_bh(&write_nodes_lock);
+ list_add_tail(&ni->write_list, &write_nodes);
+ spin_unlock_bh(&write_nodes_lock);
+ }
+ }
+ }
+}
+
+static void clean_one_writequeue(struct nodeinfo *ni)
+{
+ struct list_head *list;
+ struct list_head *temp;
+
+ spin_lock(&ni->writequeue_lock);
+ list_for_each_safe(list, temp, &ni->writequeue) {
+ struct writequeue_entry *e =
+ list_entry(list, struct writequeue_entry, list);
+ list_del(&e->list);
+ free_entry(e);
+ }
+ spin_unlock(&ni->writequeue_lock);
+}
+
+static void clean_writequeues(void)
+{
+ int i;
+
+ for (i=1; i<=max_nodeid; i++) {
+ struct nodeinfo *ni = nodeid2nodeinfo(i, 0);
+ if (ni)
+ clean_one_writequeue(ni);
+ }
+}
+
+
+static void dealloc_nodeinfo(void)
+{
+ int i;
+
+ for (i=1; i<=max_nodeid; i++) {
+ struct nodeinfo *ni = nodeid2nodeinfo(i, 0);
+ if (ni) {
+ idr_remove(&nodeinfo_idr, i);
+ kfree(ni);
+ }
+ }
+}
+
+static int write_list_empty(void)
+{
+ int status;
+
+ spin_lock_bh(&write_nodes_lock);
+ status = list_empty(&write_nodes);
+ spin_unlock_bh(&write_nodes_lock);
+
+ return status;
+}
+
+static int dlm_recvd(void *data)
+{
+ DECLARE_WAITQUEUE(wait, current);
+
+ while (!kthread_should_stop()) {
+ int count = 0;
+
+ set_current_state(TASK_INTERRUPTIBLE);
+ add_wait_queue(&lowcomms_recv_wait, &wait);
+ if (!test_bit(CF_READ_PENDING, &sctp_con.flags))
+ schedule();
+ remove_wait_queue(&lowcomms_recv_wait, &wait);
+ set_current_state(TASK_RUNNING);
+
+ if (test_and_clear_bit(CF_READ_PENDING, &sctp_con.flags)) {
+ int ret;
+
+ do {
+ ret = receive_from_sock();
+
+ /* Don't starve out everyone else */
+ if (++count >= MAX_RX_MSG_COUNT) {
+ schedule();
+ count = 0;
+ }
+ } while (!kthread_should_stop() && ret >=0);
+ }
+ schedule();
+ }
+
+ return 0;
+}
+
+static int dlm_sendd(void *data)
+{
+ DECLARE_WAITQUEUE(wait, current);
+
+ add_wait_queue(sctp_con.sock->sk->sk_sleep, &wait);
+
+ while (!kthread_should_stop()) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (write_list_empty())
+ schedule();
+ set_current_state(TASK_RUNNING);
+
+ if (sctp_con.eagain_flag) {
+ sctp_con.eagain_flag = 0;
+ refill_write_queue();
+ }
+ process_output_queue();
+ }
+
+ remove_wait_queue(sctp_con.sock->sk->sk_sleep, &wait);
+
+ return 0;
+}
+
+static void daemons_stop(void)
+{
+ kthread_stop(recv_task);
+ kthread_stop(send_task);
+}
+
+static int daemons_start(void)
+{
+ struct task_struct *p;
+ int error;
+
+ p = kthread_run(dlm_recvd, NULL, "dlm_recvd");
+ error = IS_ERR(p);
+ if (error) {
+ log_print("can't start dlm_recvd %d", error);
+ return error;
+ }
+ recv_task = p;
+
+ p = kthread_run(dlm_sendd, NULL, "dlm_sendd");
+ error = IS_ERR(p);
+ if (error) {
+ log_print("can't start dlm_sendd %d", error);
+ kthread_stop(recv_task);
+ return error;
+ }
+ send_task = p;
+
+ return 0;
+}
+
+/*
+ * This is quite likely to sleep...
+ */
+int dlm_lowcomms_start(void)
+{
+ int error;
+
+ spin_lock_init(&write_nodes_lock);
+ INIT_LIST_HEAD(&write_nodes);
+ init_rwsem(&nodeinfo_lock);
+
+ error = init_sock();
+ if (error)
+ goto fail_sock;
+ error = daemons_start();
+ if (error)
+ goto fail_sock;
+ atomic_set(&accepting, 1);
+ return 0;
+
+ fail_sock:
+ close_connection();
+ return error;
+}
+
+/* Set all the activity flags to prevent any socket activity. */
+
+void dlm_lowcomms_stop(void)
+{
+ atomic_set(&accepting, 0);
+ sctp_con.flags = 0x7;
+ daemons_stop();
+ clean_writequeues();
+ close_connection();
+ dealloc_nodeinfo();
+ max_nodeid = 0;
+}
+
+int dlm_lowcomms_init(void)
+{
+ init_waitqueue_head(&lowcomms_recv_wait);
+ return 0;
+}
+
+void dlm_lowcomms_exit(void)
+{
+ int i;
+
+ for (i = 0; i < local_count; i++)
+ kfree(local_addr[i]);
+ local_count = 0;
+ local_nodeid = 0;
+}
+
diff --git a/fs/dlm/lowcomms.h b/fs/dlm/lowcomms.h
new file mode 100644
index 0000000..3af8035
--- /dev/null
+++ b/fs/dlm/lowcomms.h
@@ -0,0 +1,25 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#ifndef __LOWCOMMS_DOT_H__
+#define __LOWCOMMS_DOT_H__
+
+int dlm_lowcomms_init(void);
+void dlm_lowcomms_exit(void);
+int dlm_lowcomms_start(void);
+void dlm_lowcomms_stop(void);
+void *dlm_lowcomms_get_buffer(int nodeid, int len, int allocation, char **ppc);
+void dlm_lowcomms_commit_buffer(void *mh);
+
+#endif /* __LOWCOMMS_DOT_H__ */
+
diff --git a/fs/dlm/lvb_table.h b/fs/dlm/lvb_table.h
new file mode 100644
index 0000000..cc3e92f
--- /dev/null
+++ b/fs/dlm/lvb_table.h
@@ -0,0 +1,18 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) 2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#ifndef __LVB_TABLE_DOT_H__
+#define __LVB_TABLE_DOT_H__
+
+extern const int dlm_lvb_operations[8][8];
+
+#endif
diff --git a/fs/dlm/main.c b/fs/dlm/main.c
new file mode 100644
index 0000000..81bf4cb
--- /dev/null
+++ b/fs/dlm/main.c
@@ -0,0 +1,89 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#include "dlm_internal.h"
+#include "lockspace.h"
+#include "lock.h"
+#include "memory.h"
+#include "lowcomms.h"
+#include "config.h"
+
+#ifdef CONFIG_DLM_DEBUG
+int dlm_register_debugfs(void);
+void dlm_unregister_debugfs(void);
+#else
+static inline int dlm_register_debugfs(void) { return 0; }
+static inline void dlm_unregister_debugfs(void) { }
+#endif
+
+static int __init init_dlm(void)
+{
+ int error;
+
+ error = dlm_memory_init();
+ if (error)
+ goto out;
+
+ error = dlm_lockspace_init();
+ if (error)
+ goto out_mem;
+
+ error = dlm_config_init();
+ if (error)
+ goto out_lockspace;
+
+ error = dlm_register_debugfs();
+ if (error)
+ goto out_config;
+
+ error = dlm_lowcomms_init();
+ if (error)
+ goto out_debug;
+
+ printk("DLM (built %s %s) installed\n", __DATE__, __TIME__);
+
+ return 0;
+
+ out_debug:
+ dlm_unregister_debugfs();
+ out_config:
+ dlm_config_exit();
+ out_lockspace:
+ dlm_lockspace_exit();
+ out_mem:
+ dlm_memory_exit();
+ out:
+ return error;
+}
+
+static void __exit exit_dlm(void)
+{
+ dlm_lowcomms_exit();
+ dlm_config_exit();
+ dlm_memory_exit();
+ dlm_lockspace_exit();
+ dlm_unregister_debugfs();
+}
+
+module_init(init_dlm);
+module_exit(exit_dlm);
+
+MODULE_DESCRIPTION("Distributed Lock Manager");
+MODULE_AUTHOR("Red Hat, Inc.");
+MODULE_LICENSE("GPL");
+
+EXPORT_SYMBOL_GPL(dlm_new_lockspace);
+EXPORT_SYMBOL_GPL(dlm_release_lockspace);
+EXPORT_SYMBOL_GPL(dlm_lock);
+EXPORT_SYMBOL_GPL(dlm_unlock);
+
diff --git a/fs/dlm/member.c b/fs/dlm/member.c
new file mode 100644
index 0000000..439249b
--- /dev/null
+++ b/fs/dlm/member.c
@@ -0,0 +1,314 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) 2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#include "dlm_internal.h"
+#include "lockspace.h"
+#include "member.h"
+#include "recoverd.h"
+#include "recover.h"
+#include "lowcomms.h"
+#include "rcom.h"
+#include "config.h"
+
+/*
+ * Following called by dlm_recoverd thread
+ */
+
+static void add_ordered_member(struct dlm_ls *ls, struct dlm_member *new)
+{
+ struct dlm_member *memb = NULL;
+ struct list_head *tmp;
+ struct list_head *newlist = &new->list;
+ struct list_head *head = &ls->ls_nodes;
+
+ list_for_each(tmp, head) {
+ memb = list_entry(tmp, struct dlm_member, list);
+ if (new->nodeid < memb->nodeid)
+ break;
+ }
+
+ if (!memb)
+ list_add_tail(newlist, head);
+ else {
+ /* FIXME: can use list macro here */
+ newlist->prev = tmp->prev;
+ newlist->next = tmp;
+ tmp->prev->next = newlist;
+ tmp->prev = newlist;
+ }
+}
+
+static int dlm_add_member(struct dlm_ls *ls, int nodeid)
+{
+ struct dlm_member *memb;
+ int w;
+
+ memb = kmalloc(sizeof(struct dlm_member), GFP_KERNEL);
+ if (!memb)
+ return -ENOMEM;
+
+ w = dlm_node_weight(ls->ls_name, nodeid);
+ if (w < 0)
+ return w;
+
+ memb->nodeid = nodeid;
+ memb->weight = w;
+ add_ordered_member(ls, memb);
+ ls->ls_num_nodes++;
+ return 0;
+}
+
+static void dlm_remove_member(struct dlm_ls *ls, struct dlm_member *memb)
+{
+ list_move(&memb->list, &ls->ls_nodes_gone);
+ ls->ls_num_nodes--;
+}
+
+static int dlm_is_member(struct dlm_ls *ls, int nodeid)
+{
+ struct dlm_member *memb;
+
+ list_for_each_entry(memb, &ls->ls_nodes, list) {
+ if (memb->nodeid == nodeid)
+ return TRUE;
+ }
+ return FALSE;
+}
+
+int dlm_is_removed(struct dlm_ls *ls, int nodeid)
+{
+ struct dlm_member *memb;
+
+ list_for_each_entry(memb, &ls->ls_nodes_gone, list) {
+ if (memb->nodeid == nodeid)
+ return TRUE;
+ }
+ return FALSE;
+}
+
+static void clear_memb_list(struct list_head *head)
+{
+ struct dlm_member *memb;
+
+ while (!list_empty(head)) {
+ memb = list_entry(head->next, struct dlm_member, list);
+ list_del(&memb->list);
+ kfree(memb);
+ }
+}
+
+void dlm_clear_members(struct dlm_ls *ls)
+{
+ clear_memb_list(&ls->ls_nodes);
+ ls->ls_num_nodes = 0;
+}
+
+void dlm_clear_members_gone(struct dlm_ls *ls)
+{
+ clear_memb_list(&ls->ls_nodes_gone);
+}
+
+static void make_member_array(struct dlm_ls *ls)
+{
+ struct dlm_member *memb;
+ int i, w, x = 0, total = 0, all_zero = 0, *array;
+
+ kfree(ls->ls_node_array);
+ ls->ls_node_array = NULL;
+
+ list_for_each_entry(memb, &ls->ls_nodes, list) {
+ if (memb->weight)
+ total += memb->weight;
+ }
+
+ /* all nodes revert to weight of 1 if all have weight 0 */
+
+ if (!total) {
+ total = ls->ls_num_nodes;
+ all_zero = 1;
+ }
+
+ ls->ls_total_weight = total;
+
+ array = kmalloc(sizeof(int) * total, GFP_KERNEL);
+ if (!array)
+ return;
+
+ list_for_each_entry(memb, &ls->ls_nodes, list) {
+ if (!all_zero && !memb->weight)
+ continue;
+
+ if (all_zero)
+ w = 1;
+ else
+ w = memb->weight;
+
+ DLM_ASSERT(x < total, printk("total %d x %d\n", total, x););
+
+ for (i = 0; i < w; i++)
+ array[x++] = memb->nodeid;
+ }
+
+ ls->ls_node_array = array;
+}
+
+/* send a status request to all members just to establish comms connections */
+
+static void ping_members(struct dlm_ls *ls)
+{
+ struct dlm_member *memb;
+ list_for_each_entry(memb, &ls->ls_nodes, list)
+ dlm_rcom_status(ls, memb->nodeid);
+}
+
+int dlm_recover_members(struct dlm_ls *ls, struct dlm_recover *rv, int *neg_out)
+{
+ struct dlm_member *memb, *safe;
+ int i, error, found, pos = 0, neg = 0, low = -1;
+
+ /* move departed members from ls_nodes to ls_nodes_gone */
+
+ list_for_each_entry_safe(memb, safe, &ls->ls_nodes, list) {
+ found = FALSE;
+ for (i = 0; i < rv->node_count; i++) {
+ if (memb->nodeid == rv->nodeids[i]) {
+ found = TRUE;
+ break;
+ }
+ }
+
+ if (!found) {
+ neg++;
+ dlm_remove_member(ls, memb);
+ log_debug(ls, "remove member %d", memb->nodeid);
+ }
+ }
+
+ /* add new members to ls_nodes */
+
+ for (i = 0; i < rv->node_count; i++) {
+ if (dlm_is_member(ls, rv->nodeids[i]))
+ continue;
+ dlm_add_member(ls, rv->nodeids[i]);
+ pos++;
+ log_debug(ls, "add member %d", rv->nodeids[i]);
+ }
+
+ list_for_each_entry(memb, &ls->ls_nodes, list) {
+ if (low == -1 || memb->nodeid < low)
+ low = memb->nodeid;
+ }
+ ls->ls_low_nodeid = low;
+
+ make_member_array(ls);
+ dlm_set_recover_status(ls, DLM_RS_NODES);
+ *neg_out = neg;
+
+ ping_members(ls);
+
+ error = dlm_recover_members_wait(ls);
+ log_debug(ls, "total members %d", ls->ls_num_nodes);
+ return error;
+}
+
+/*
+ * Following called from lockspace.c
+ */
+
+int dlm_ls_stop(struct dlm_ls *ls)
+{
+ int new;
+
+ /*
+ * A stop cancels any recovery that's in progress (see RECOVERY_STOP,
+ * dlm_recovery_stopped()) and prevents any new locks from being
+ * processed (see RUNNING, dlm_locking_stopped()).
+ */
+
+ spin_lock(&ls->ls_recover_lock);
+ set_bit(LSFL_RECOVERY_STOP, &ls->ls_flags);
+ new = test_and_clear_bit(LSFL_RUNNING, &ls->ls_flags);
+ ls->ls_recover_seq++;
+ spin_unlock(&ls->ls_recover_lock);
+
+ /*
+ * This in_recovery lock does two things:
+ *
+ * 1) Keeps this function from returning until all threads are out
+ * of locking routines and locking is truely stopped.
+ * 2) Keeps any new requests from being processed until it's unlocked
+ * when recovery is complete.
+ */
+
+ if (new)
+ down_write(&ls->ls_in_recovery);
+
+ /*
+ * The recoverd suspend/resume makes sure that dlm_recoverd (if
+ * running) has noticed the clearing of RUNNING above and quit
+ * processing the previous recovery. This will be true for all nodes
+ * before any nodes start the new recovery.
+ */
+
+ dlm_recoverd_suspend(ls);
+ ls->ls_recover_status = 0;
+ dlm_recoverd_resume(ls);
+ return 0;
+}
+
+int dlm_ls_start(struct dlm_ls *ls)
+{
+ struct dlm_recover *rv = NULL, *rv_old;
+ int *ids = NULL;
+ int error, count;
+
+ rv = kmalloc(sizeof(struct dlm_recover), GFP_KERNEL);
+ if (!rv)
+ return -ENOMEM;
+ memset(rv, 0, sizeof(struct dlm_recover));
+
+ error = count = dlm_nodeid_list(ls->ls_name, &ids);
+ if (error <= 0)
+ goto fail;
+
+ spin_lock(&ls->ls_recover_lock);
+
+ /* the lockspace needs to be stopped before it can be started */
+
+ if (!dlm_locking_stopped(ls)) {
+ spin_unlock(&ls->ls_recover_lock);
+ log_error(ls, "start ignored: lockspace running");
+ error = -EINVAL;
+ goto fail;
+ }
+
+ rv->nodeids = ids;
+ rv->node_count = count;
+ rv->seq = ++ls->ls_recover_seq;
+ rv_old = ls->ls_recover_args;
+ ls->ls_recover_args = rv;
+ spin_unlock(&ls->ls_recover_lock);
+
+ if (rv_old) {
+ kfree(rv_old->nodeids);
+ kfree(rv_old);
+ }
+
+ dlm_recoverd_kick(ls);
+ return 0;
+
+ fail:
+ kfree(rv);
+ kfree(ids);
+ return error;
+}
+
diff --git a/fs/dlm/member.h b/fs/dlm/member.h
new file mode 100644
index 0000000..927c08c
--- /dev/null
+++ b/fs/dlm/member.h
@@ -0,0 +1,24 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) 2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#ifndef __MEMBER_DOT_H__
+#define __MEMBER_DOT_H__
+
+int dlm_ls_stop(struct dlm_ls *ls);
+int dlm_ls_start(struct dlm_ls *ls);
+void dlm_clear_members(struct dlm_ls *ls);
+void dlm_clear_members_gone(struct dlm_ls *ls);
+int dlm_recover_members(struct dlm_ls *ls, struct dlm_recover *rv,int *neg_out);
+int dlm_is_removed(struct dlm_ls *ls, int nodeid);
+
+#endif /* __MEMBER_DOT_H__ */
+
diff --git a/fs/dlm/memory.c b/fs/dlm/memory.c
new file mode 100644
index 0000000..0b9851d
--- /dev/null
+++ b/fs/dlm/memory.c
@@ -0,0 +1,122 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#include "dlm_internal.h"
+#include "config.h"
+#include "memory.h"
+
+static kmem_cache_t *lkb_cache;
+
+
+int dlm_memory_init(void)
+{
+ int ret = 0;
+
+ lkb_cache = kmem_cache_create("dlm_lkb", sizeof(struct dlm_lkb),
+ __alignof__(struct dlm_lkb), 0, NULL, NULL);
+ if (!lkb_cache)
+ ret = -ENOMEM;
+ return ret;
+}
+
+void dlm_memory_exit(void)
+{
+ if (lkb_cache)
+ kmem_cache_destroy(lkb_cache);
+}
+
+char *allocate_lvb(struct dlm_ls *ls)
+{
+ char *p;
+
+ p = kmalloc(ls->ls_lvblen, GFP_KERNEL);
+ if (p)
+ memset(p, 0, ls->ls_lvblen);
+ return p;
+}
+
+void free_lvb(char *p)
+{
+ kfree(p);
+}
+
+uint64_t *allocate_range(struct dlm_ls *ls)
+{
+ int ralen = 4*sizeof(uint64_t);
+ uint64_t *p;
+
+ p = kmalloc(ralen, GFP_KERNEL);
+ if (p)
+ memset(p, 0, ralen);
+ return p;
+}
+
+void free_range(uint64_t *p)
+{
+ kfree(p);
+}
+
+/* FIXME: have some minimal space built-in to rsb for the name and
+ kmalloc a separate name if needed, like dentries are done */
+
+struct dlm_rsb *allocate_rsb(struct dlm_ls *ls, int namelen)
+{
+ struct dlm_rsb *r;
+
+ DLM_ASSERT(namelen <= DLM_RESNAME_MAXLEN,);
+
+ r = kmalloc(sizeof(*r) + namelen, GFP_KERNEL);
+ if (r)
+ memset(r, 0, sizeof(*r) + namelen);
+ return r;
+}
+
+void free_rsb(struct dlm_rsb *r)
+{
+ if (r->res_lvbptr)
+ free_lvb(r->res_lvbptr);
+ kfree(r);
+}
+
+struct dlm_lkb *allocate_lkb(struct dlm_ls *ls)
+{
+ struct dlm_lkb *lkb;
+
+ lkb = kmem_cache_alloc(lkb_cache, GFP_KERNEL);
+ if (lkb)
+ memset(lkb, 0, sizeof(*lkb));
+ return lkb;
+}
+
+void free_lkb(struct dlm_lkb *lkb)
+{
+ kmem_cache_free(lkb_cache, lkb);
+}
+
+struct dlm_direntry *allocate_direntry(struct dlm_ls *ls, int namelen)
+{
+ struct dlm_direntry *de;
+
+ DLM_ASSERT(namelen <= DLM_RESNAME_MAXLEN,);
+
+ de = kmalloc(sizeof(*de) + namelen, GFP_KERNEL);
+ if (de)
+ memset(de, 0, sizeof(*de) + namelen);
+ return de;
+}
+
+void free_direntry(struct dlm_direntry *de)
+{
+ kfree(de);
+}
+
diff --git a/fs/dlm/memory.h b/fs/dlm/memory.h
new file mode 100644
index 0000000..7b23513
--- /dev/null
+++ b/fs/dlm/memory.h
@@ -0,0 +1,31 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#ifndef __MEMORY_DOT_H__
+#define __MEMORY_DOT_H__
+
+int dlm_memory_init(void);
+void dlm_memory_exit(void);
+struct dlm_rsb *allocate_rsb(struct dlm_ls *ls, int namelen);
+void free_rsb(struct dlm_rsb *r);
+struct dlm_lkb *allocate_lkb(struct dlm_ls *ls);
+void free_lkb(struct dlm_lkb *l);
+struct dlm_direntry *allocate_direntry(struct dlm_ls *ls, int namelen);
+void free_direntry(struct dlm_direntry *de);
+char *allocate_lvb(struct dlm_ls *ls);
+void free_lvb(char *l);
+uint64_t *allocate_range(struct dlm_ls *ls);
+void free_range(uint64_t *l);
+
+#endif /* __MEMORY_DOT_H__ */
+
diff --git a/fs/dlm/midcomms.c b/fs/dlm/midcomms.c
new file mode 100644
index 0000000..d96f9bb
--- /dev/null
+++ b/fs/dlm/midcomms.c
@@ -0,0 +1,140 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+/*
+ * midcomms.c
+ *
+ * This is the appallingly named "mid-level" comms layer.
+ *
+ * Its purpose is to take packets from the "real" comms layer,
+ * split them up into packets and pass them to the interested
+ * part of the locking mechanism.
+ *
+ * It also takes messages from the locking layer, formats them
+ * into packets and sends them to the comms layer.
+ */
+
+#include "dlm_internal.h"
+#include "lowcomms.h"
+#include "config.h"
+#include "rcom.h"
+#include "lock.h"
+#include "midcomms.h"
+
+
+static void copy_from_cb(void *dst, const void *base, unsigned offset,
+ unsigned len, unsigned limit)
+{
+ unsigned copy = len;
+
+ if ((copy + offset) > limit)
+ copy = limit - offset;
+ memcpy(dst, base + offset, copy);
+ len -= copy;
+ if (len)
+ memcpy(dst + copy, base, len);
+}
+
+/*
+ * Called from the low-level comms layer to process a buffer of
+ * commands.
+ *
+ * Only complete messages are processed here, any "spare" bytes from
+ * the end of a buffer are saved and tacked onto the front of the next
+ * message that comes in. I doubt this will happen very often but we
+ * need to be able to cope with it and I don't want the task to be waiting
+ * for packets to come in when there is useful work to be done.
+ */
+
+int dlm_process_incoming_buffer(int nodeid, const void *base,
+ unsigned offset, unsigned len, unsigned limit)
+{
+ unsigned char __tmp[DLM_INBUF_LEN];
+ struct dlm_header *msg = (struct dlm_header *) __tmp;
+ int ret = 0;
+ int err = 0;
+ uint16_t msglen;
+ uint32_t lockspace;
+
+ while (len > sizeof(struct dlm_header)) {
+
+ /* Copy just the header to check the total length. The
+ message may wrap around the end of the buffer back to the
+ start, so we need to use a temp buffer and copy_from_cb. */
+
+ copy_from_cb(msg, base, offset, sizeof(struct dlm_header),
+ limit);
+
+ msglen = le16_to_cpu(msg->h_length);
+ lockspace = msg->h_lockspace;
+
+ err = -EINVAL;
+ if (msglen < sizeof(struct dlm_header))
+ break;
+ err = -E2BIG;
+ if (msglen > dlm_config.buffer_size) {
+ log_print("message size %d from %d too big, buf len %d",
+ msglen, nodeid, len);
+ break;
+ }
+ err = 0;
+
+ /* If only part of the full message is contained in this
+ buffer, then do nothing and wait for lowcomms to call
+ us again later with more data. We return 0 meaning
+ we've consumed none of the input buffer. */
+
+ if (msglen > len)
+ break;
+
+ /* Allocate a larger temp buffer if the full message won't fit
+ in the buffer on the stack (which should work for most
+ ordinary messages). */
+
+ if (msglen > sizeof(__tmp) &&
+ msg == (struct dlm_header *) __tmp) {
+ msg = kmalloc(dlm_config.buffer_size, GFP_KERNEL);
+ if (msg == NULL)
+ return ret;
+ }
+
+ copy_from_cb(msg, base, offset, msglen, limit);
+
+ BUG_ON(lockspace != msg->h_lockspace);
+
+ ret += msglen;
+ offset += msglen;
+ offset &= (limit - 1);
+ len -= msglen;
+
+ switch (msg->h_cmd) {
+ case DLM_MSG:
+ dlm_receive_message(msg, nodeid, FALSE);
+ break;
+
+ case DLM_RCOM:
+ dlm_receive_rcom(msg, nodeid);
+ break;
+
+ default:
+ log_print("unknown msg type %x from %u: %u %u %u %u",
+ msg->h_cmd, nodeid, msglen, len, offset, ret);
+ }
+ }
+
+ if (msg != (struct dlm_header *) __tmp)
+ kfree(msg);
+
+ return err ? err : ret;
+}
+
diff --git a/fs/dlm/midcomms.h b/fs/dlm/midcomms.h
new file mode 100644
index 0000000..95852a5
--- /dev/null
+++ b/fs/dlm/midcomms.h
@@ -0,0 +1,21 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#ifndef __MIDCOMMS_DOT_H__
+#define __MIDCOMMS_DOT_H__
+
+int dlm_process_incoming_buffer(int nodeid, const void *base, unsigned offset,
+ unsigned len, unsigned limit);
+
+#endif /* __MIDCOMMS_DOT_H__ */
+
diff --git a/fs/dlm/rcom.c b/fs/dlm/rcom.c
new file mode 100644
index 0000000..4c5c08a
--- /dev/null
+++ b/fs/dlm/rcom.c
@@ -0,0 +1,460 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#include "dlm_internal.h"
+#include "lockspace.h"
+#include "member.h"
+#include "lowcomms.h"
+#include "midcomms.h"
+#include "rcom.h"
+#include "recover.h"
+#include "dir.h"
+#include "config.h"
+#include "memory.h"
+#include "lock.h"
+#include "util.h"
+
+
+static int rcom_response(struct dlm_ls *ls)
+{
+ return test_bit(LSFL_RCOM_READY, &ls->ls_flags);
+}
+
+static int create_rcom(struct dlm_ls *ls, int to_nodeid, int type, int len,
+ struct dlm_rcom **rc_ret, struct dlm_mhandle **mh_ret)
+{
+ struct dlm_rcom *rc;
+ struct dlm_mhandle *mh;
+ char *mb;
+ int mb_len = sizeof(struct dlm_rcom) + len;
+
+ mh = dlm_lowcomms_get_buffer(to_nodeid, mb_len, GFP_KERNEL, &mb);
+ if (!mh) {
+ log_print("create_rcom to %d type %d len %d ENOBUFS",
+ to_nodeid, type, len);
+ return -ENOBUFS;
+ }
+ memset(mb, 0, mb_len);
+
+ rc = (struct dlm_rcom *) mb;
+
+ rc->rc_header.h_version = (DLM_HEADER_MAJOR | DLM_HEADER_MINOR);
+ rc->rc_header.h_lockspace = ls->ls_global_id;
+ rc->rc_header.h_nodeid = dlm_our_nodeid();
+ rc->rc_header.h_length = mb_len;
+ rc->rc_header.h_cmd = DLM_RCOM;
+
+ rc->rc_type = type;
+
+ *mh_ret = mh;
+ *rc_ret = rc;
+ return 0;
+}
+
+static void send_rcom(struct dlm_ls *ls, struct dlm_mhandle *mh,
+ struct dlm_rcom *rc)
+{
+ dlm_rcom_out(rc);
+ dlm_lowcomms_commit_buffer(mh);
+}
+
+/* When replying to a status request, a node also sends back its
+ configuration values. The requesting node then checks that the remote
+ node is configured the same way as itself. */
+
+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, int nodeid)
+{
+ if (rf->rf_lvblen != ls->ls_lvblen ||
+ rf->rf_lsflags != ls->ls_exflags) {
+ log_error(ls, "config mismatch: %d,%x nodeid %d: %d,%x",
+ ls->ls_lvblen, ls->ls_exflags,
+ nodeid, rf->rf_lvblen, rf->rf_lsflags);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+int dlm_rcom_status(struct dlm_ls *ls, int nodeid)
+{
+ struct dlm_rcom *rc;
+ struct dlm_mhandle *mh;
+ int error = 0;
+
+ memset(ls->ls_recover_buf, 0, dlm_config.buffer_size);
+
+ if (nodeid == dlm_our_nodeid()) {
+ rc = (struct dlm_rcom *) ls->ls_recover_buf;
+ rc->rc_result = dlm_recover_status(ls);
+ goto out;
+ }
+
+ error = create_rcom(ls, nodeid, DLM_RCOM_STATUS, 0, &rc, &mh);
+ if (error)
+ goto out;
+
+ send_rcom(ls, mh, rc);
+
+ error = dlm_wait_function(ls, &rcom_response);
+ clear_bit(LSFL_RCOM_READY, &ls->ls_flags);
+ if (error)
+ goto out;
+
+ rc = (struct dlm_rcom *) ls->ls_recover_buf;
+
+ if (rc->rc_result == -ESRCH) {
+ /* we pretend the remote lockspace exists with 0 status */
+ log_debug(ls, "remote node %d not ready", nodeid);
+ rc->rc_result = 0;
+ } else
+ error = check_config(ls, (struct rcom_config *) rc->rc_buf,
+ nodeid);
+ /* the caller looks at rc_result for the remote recovery status */
+ out:
+ return error;
+}
+
+static void receive_rcom_status(struct dlm_ls *ls, struct dlm_rcom *rc_in)
+{
+ struct dlm_rcom *rc;
+ struct dlm_mhandle *mh;
+ int error, nodeid = rc_in->rc_header.h_nodeid;
+
+ error = create_rcom(ls, nodeid, DLM_RCOM_STATUS_REPLY,
+ sizeof(struct rcom_config), &rc, &mh);
+ if (error)
+ return;
+ rc->rc_result = dlm_recover_status(ls);
+ make_config(ls, (struct rcom_config *) rc->rc_buf);
+
+ send_rcom(ls, mh, rc);
+}
+
+static void receive_rcom_status_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
+{
+ memcpy(ls->ls_recover_buf, rc_in, rc_in->rc_header.h_length);
+ set_bit(LSFL_RCOM_READY, &ls->ls_flags);
+ wake_up(&ls->ls_wait_general);
+}
+
+int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name, int last_len)
+{
+ struct dlm_rcom *rc;
+ struct dlm_mhandle *mh;
+ int error = 0, len = sizeof(struct dlm_rcom);
+
+ memset(ls->ls_recover_buf, 0, dlm_config.buffer_size);
+
+ if (nodeid == dlm_our_nodeid()) {
+ dlm_copy_master_names(ls, last_name, last_len,
+ ls->ls_recover_buf + len,
+ dlm_config.buffer_size - len, nodeid);
+ goto out;
+ }
+
+ error = create_rcom(ls, nodeid, DLM_RCOM_NAMES, last_len, &rc, &mh);
+ if (error)
+ goto out;
+ memcpy(rc->rc_buf, last_name, last_len);
+
+ send_rcom(ls, mh, rc);
+
+ error = dlm_wait_function(ls, &rcom_response);
+ clear_bit(LSFL_RCOM_READY, &ls->ls_flags);
+ out:
+ return error;
+}
+
+static void receive_rcom_names(struct dlm_ls *ls, struct dlm_rcom *rc_in)
+{
+ struct dlm_rcom *rc;
+ struct dlm_mhandle *mh;
+ int error, inlen, outlen;
+ int nodeid = rc_in->rc_header.h_nodeid;
+ uint32_t status = dlm_recover_status(ls);
+
+ /*
+ * We can't run dlm_dir_rebuild_send (which uses ls_nodes) while
+ * dlm_recoverd is running ls_nodes_reconfig (which changes ls_nodes).
+ * It could only happen in rare cases where we get a late NAMES
+ * message from a previous instance of recovery.
+ */
+
+ if (!(status & DLM_RS_NODES)) {
+ log_debug(ls, "ignoring RCOM_NAMES from %u", nodeid);
+ return;
+ }
+
+ nodeid = rc_in->rc_header.h_nodeid;
+ inlen = rc_in->rc_header.h_length - sizeof(struct dlm_rcom);
+ outlen = dlm_config.buffer_size - sizeof(struct dlm_rcom);
+
+ error = create_rcom(ls, nodeid, DLM_RCOM_NAMES_REPLY, outlen, &rc, &mh);
+ if (error)
+ return;
+
+ dlm_copy_master_names(ls, rc_in->rc_buf, inlen, rc->rc_buf, outlen,
+ nodeid);
+ send_rcom(ls, mh, rc);
+}
+
+static void receive_rcom_names_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
+{
+ memcpy(ls->ls_recover_buf, rc_in, rc_in->rc_header.h_length);
+ set_bit(LSFL_RCOM_READY, &ls->ls_flags);
+ wake_up(&ls->ls_wait_general);
+}
+
+int dlm_send_rcom_lookup(struct dlm_rsb *r, int dir_nodeid)
+{
+ struct dlm_rcom *rc;
+ struct dlm_mhandle *mh;
+ struct dlm_ls *ls = r->res_ls;
+ int error;
+
+ error = create_rcom(ls, dir_nodeid, DLM_RCOM_LOOKUP, r->res_length,
+ &rc, &mh);
+ if (error)
+ goto out;
+ memcpy(rc->rc_buf, r->res_name, r->res_length);
+ rc->rc_id = (unsigned long) r;
+
+ send_rcom(ls, mh, rc);
+ out:
+ return error;
+}
+
+static void receive_rcom_lookup(struct dlm_ls *ls, struct dlm_rcom *rc_in)
+{
+ struct dlm_rcom *rc;
+ struct dlm_mhandle *mh;
+ int error, ret_nodeid, nodeid = rc_in->rc_header.h_nodeid;
+ int len = rc_in->rc_header.h_length - sizeof(struct dlm_rcom);
+
+ error = create_rcom(ls, nodeid, DLM_RCOM_LOOKUP_REPLY, 0, &rc, &mh);
+ if (error)
+ return;
+
+ error = dlm_dir_lookup(ls, nodeid, rc_in->rc_buf, len, &ret_nodeid);
+ if (error)
+ ret_nodeid = error;
+ rc->rc_result = ret_nodeid;
+ rc->rc_id = rc_in->rc_id;
+
+ send_rcom(ls, mh, rc);
+}
+
+static void receive_rcom_lookup_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
+{
+ dlm_recover_master_reply(ls, rc_in);
+}
+
+static void pack_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb,
+ struct rcom_lock *rl)
+{
+ memset(rl, 0, sizeof(*rl));
+
+ rl->rl_ownpid = lkb->lkb_ownpid;
+ rl->rl_lkid = lkb->lkb_id;
+ rl->rl_exflags = lkb->lkb_exflags;
+ rl->rl_flags = lkb->lkb_flags;
+ rl->rl_lvbseq = lkb->lkb_lvbseq;
+ rl->rl_rqmode = lkb->lkb_rqmode;
+ rl->rl_grmode = lkb->lkb_grmode;
+ rl->rl_status = lkb->lkb_status;
+ rl->rl_wait_type = lkb->lkb_wait_type;
+
+ if (lkb->lkb_bastaddr)
+ rl->rl_asts |= AST_BAST;
+ if (lkb->lkb_astaddr)
+ rl->rl_asts |= AST_COMP;
+
+ if (lkb->lkb_range)
+ memcpy(rl->rl_range, lkb->lkb_range, 4*sizeof(uint64_t));
+
+ rl->rl_namelen = r->res_length;
+ memcpy(rl->rl_name, r->res_name, r->res_length);
+
+ /* FIXME: might we have an lvb without DLM_LKF_VALBLK set ?
+ If so, receive_rcom_lock_args() won't take this copy. */
+
+ if (lkb->lkb_lvbptr)
+ memcpy(rl->rl_lvb, lkb->lkb_lvbptr, r->res_ls->ls_lvblen);
+}
+
+int dlm_send_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
+{
+ struct dlm_ls *ls = r->res_ls;
+ struct dlm_rcom *rc;
+ struct dlm_mhandle *mh;
+ struct rcom_lock *rl;
+ int error, len = sizeof(struct rcom_lock);
+
+ if (lkb->lkb_lvbptr)
+ len += ls->ls_lvblen;
+
+ error = create_rcom(ls, r->res_nodeid, DLM_RCOM_LOCK, len, &rc, &mh);
+ if (error)
+ goto out;
+
+ rl = (struct rcom_lock *) rc->rc_buf;
+ pack_rcom_lock(r, lkb, rl);
+ rc->rc_id = (unsigned long) r;
+
+ send_rcom(ls, mh, rc);
+ out:
+ return error;
+}
+
+static void receive_rcom_lock(struct dlm_ls *ls, struct dlm_rcom *rc_in)
+{
+ struct dlm_rcom *rc;
+ struct dlm_mhandle *mh;
+ int error, nodeid = rc_in->rc_header.h_nodeid;
+
+ dlm_recover_master_copy(ls, rc_in);
+
+ error = create_rcom(ls, nodeid, DLM_RCOM_LOCK_REPLY,
+ sizeof(struct rcom_lock), &rc, &mh);
+ if (error)
+ return;
+
+ /* We send back the same rcom_lock struct we received, but
+ dlm_recover_master_copy() has filled in rl_remid and rl_result */
+
+ memcpy(rc->rc_buf, rc_in->rc_buf, sizeof(struct rcom_lock));
+ rc->rc_id = rc_in->rc_id;
+
+ send_rcom(ls, mh, rc);
+}
+
+static void receive_rcom_lock_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
+{
+ uint32_t status = dlm_recover_status(ls);
+
+ if (!(status & DLM_RS_DIR)) {
+ log_debug(ls, "ignoring RCOM_LOCK_REPLY from %u",
+ rc_in->rc_header.h_nodeid);
+ return;
+ }
+
+ dlm_recover_process_copy(ls, rc_in);
+}
+
+static int send_ls_not_ready(int nodeid, struct dlm_rcom *rc_in)
+{
+ struct dlm_rcom *rc;
+ struct dlm_mhandle *mh;
+ char *mb;
+ int mb_len = sizeof(struct dlm_rcom);
+
+ mh = dlm_lowcomms_get_buffer(nodeid, mb_len, GFP_KERNEL, &mb);
+ if (!mh)
+ return -ENOBUFS;
+ memset(mb, 0, mb_len);
+
+ rc = (struct dlm_rcom *) mb;
+
+ rc->rc_header.h_version = (DLM_HEADER_MAJOR | DLM_HEADER_MINOR);
+ rc->rc_header.h_lockspace = rc_in->rc_header.h_lockspace;
+ rc->rc_header.h_nodeid = dlm_our_nodeid();
+ rc->rc_header.h_length = mb_len;
+ rc->rc_header.h_cmd = DLM_RCOM;
+
+ rc->rc_type = DLM_RCOM_STATUS_REPLY;
+ rc->rc_result = -ESRCH;
+
+ dlm_rcom_out(rc);
+ dlm_lowcomms_commit_buffer(mh);
+
+ return 0;
+}
+
+/* Called by dlm_recvd; corresponds to dlm_receive_message() but special
+ recovery-only comms are sent through here. */
+
+void dlm_receive_rcom(struct dlm_header *hd, int nodeid)
+{
+ struct dlm_rcom *rc = (struct dlm_rcom *) hd;
+ struct dlm_ls *ls;
+
+ dlm_rcom_in(rc);
+
+ /* If the lockspace doesn't exist then still send a status message
+ back; it's possible that it just doesn't have its global_id yet. */
+
+ ls = dlm_find_lockspace_global(hd->h_lockspace);
+ if (!ls) {
+ log_print("lockspace %x from %d not found",
+ hd->h_lockspace, nodeid);
+ send_ls_not_ready(nodeid, rc);
+ return;
+ }
+
+ if (dlm_recovery_stopped(ls) && (rc->rc_type != DLM_RCOM_STATUS)) {
+ log_error(ls, "ignoring recovery message %x from %d",
+ rc->rc_type, nodeid);
+ goto out;
+ }
+
+ if (nodeid != rc->rc_header.h_nodeid) {
+ log_error(ls, "bad rcom nodeid %d from %d",
+ rc->rc_header.h_nodeid, nodeid);
+ goto out;
+ }
+
+ switch (rc->rc_type) {
+ case DLM_RCOM_STATUS:
+ receive_rcom_status(ls, rc);
+ break;
+
+ case DLM_RCOM_NAMES:
+ receive_rcom_names(ls, rc);
+ break;
+
+ case DLM_RCOM_LOOKUP:
+ receive_rcom_lookup(ls, rc);
+ break;
+
+ case DLM_RCOM_LOCK:
+ receive_rcom_lock(ls, rc);
+ break;
+
+ case DLM_RCOM_STATUS_REPLY:
+ receive_rcom_status_reply(ls, rc);
+ break;
+
+ case DLM_RCOM_NAMES_REPLY:
+ receive_rcom_names_reply(ls, rc);
+ break;
+
+ case DLM_RCOM_LOOKUP_REPLY:
+ receive_rcom_lookup_reply(ls, rc);
+ break;
+
+ case DLM_RCOM_LOCK_REPLY:
+ receive_rcom_lock_reply(ls, rc);
+ break;
+
+ default:
+ DLM_ASSERT(0, printk("rc_type=%x\n", rc->rc_type););
+ }
+ out:
+ dlm_put_lockspace(ls);
+}
+
diff --git a/fs/dlm/rcom.h b/fs/dlm/rcom.h
new file mode 100644
index 0000000..d798432
--- /dev/null
+++ b/fs/dlm/rcom.h
@@ -0,0 +1,24 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#ifndef __RCOM_DOT_H__
+#define __RCOM_DOT_H__
+
+int dlm_rcom_status(struct dlm_ls *ls, int nodeid);
+int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name,int last_len);
+int dlm_send_rcom_lookup(struct dlm_rsb *r, int dir_nodeid);
+int dlm_send_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb);
+void dlm_receive_rcom(struct dlm_header *hd, int nodeid);
+
+#endif
+
diff --git a/fs/dlm/recover.c b/fs/dlm/recover.c
new file mode 100644
index 0000000..1712c97
--- /dev/null
+++ b/fs/dlm/recover.c
@@ -0,0 +1,762 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#include "dlm_internal.h"
+#include "lockspace.h"
+#include "dir.h"
+#include "config.h"
+#include "ast.h"
+#include "memory.h"
+#include "rcom.h"
+#include "lock.h"
+#include "lowcomms.h"
+#include "member.h"
+#include "recover.h"
+
+
+/*
+ * Recovery waiting routines: these functions wait for a particular reply from
+ * a remote node, or for the remote node to report a certain status. They need
+ * to abort if the lockspace is stopped indicating a node has failed (perhaps
+ * the one being waited for).
+ */
+
+/*
+ * Wait until given function returns non-zero or lockspace is stopped
+ * (LS_RECOVERY_STOP set due to failure of a node in ls_nodes). When another
+ * function thinks it could have completed the waited-on task, they should wake
+ * up ls_wait_general to get an immediate response rather than waiting for the
+ * timer to detect the result. A timer wakes us up periodically while waiting
+ * to see if we should abort due to a node failure. This should only be called
+ * by the dlm_recoverd thread.
+ */
+
+static void dlm_wait_timer_fn(unsigned long data)
+{
+ struct dlm_ls *ls = (struct dlm_ls *) data;
+ mod_timer(&ls->ls_timer, jiffies + (dlm_config.recover_timer * HZ));
+ wake_up(&ls->ls_wait_general);
+}
+
+int dlm_wait_function(struct dlm_ls *ls, int (*testfn) (struct dlm_ls *ls))
+{
+ int error = 0;
+
+ init_timer(&ls->ls_timer);
+ ls->ls_timer.function = dlm_wait_timer_fn;
+ ls->ls_timer.data = (long) ls;
+ ls->ls_timer.expires = jiffies + (dlm_config.recover_timer * HZ);
+ add_timer(&ls->ls_timer);
+
+ wait_event(ls->ls_wait_general, testfn(ls) || dlm_recovery_stopped(ls));
+ del_timer_sync(&ls->ls_timer);
+
+ if (dlm_recovery_stopped(ls)) {
+ log_debug(ls, "dlm_wait_function aborted");
+ error = -EINTR;
+ }
+ return error;
+}
+
+/*
+ * An efficient way for all nodes to wait for all others to have a certain
+ * status. The node with the lowest nodeid polls all the others for their
+ * status (wait_status_all) and all the others poll the node with the low id
+ * for its accumulated result (wait_status_low). When all nodes have set
+ * status flag X, then status flag X_ALL will be set on the low nodeid.
+ */
+
+uint32_t dlm_recover_status(struct dlm_ls *ls)
+{
+ uint32_t status;
+ spin_lock(&ls->ls_recover_lock);
+ status = ls->ls_recover_status;
+ spin_unlock(&ls->ls_recover_lock);
+ return status;
+}
+
+void dlm_set_recover_status(struct dlm_ls *ls, uint32_t status)
+{
+ spin_lock(&ls->ls_recover_lock);
+ ls->ls_recover_status |= status;
+ spin_unlock(&ls->ls_recover_lock);
+}
+
+static int wait_status_all(struct dlm_ls *ls, uint32_t wait_status)
+{
+ struct dlm_rcom *rc = (struct dlm_rcom *) ls->ls_recover_buf;
+ struct dlm_member *memb;
+ int error = 0, delay;
+
+ list_for_each_entry(memb, &ls->ls_nodes, list) {
+ delay = 0;
+ for (;;) {
+ if (dlm_recovery_stopped(ls)) {
+ error = -EINTR;
+ goto out;
+ }
+
+ error = dlm_rcom_status(ls, memb->nodeid);
+ if (error)
+ goto out;
+
+ if (rc->rc_result & wait_status)
+ break;
+ if (delay < 1000)
+ delay += 20;
+ msleep(delay);
+ }
+ }
+ out:
+ return error;
+}
+
+static int wait_status_low(struct dlm_ls *ls, uint32_t wait_status)
+{
+ struct dlm_rcom *rc = (struct dlm_rcom *) ls->ls_recover_buf;
+ int error = 0, delay = 0, nodeid = ls->ls_low_nodeid;
+
+ for (;;) {
+ if (dlm_recovery_stopped(ls)) {
+ error = -EINTR;
+ goto out;
+ }
+
+ error = dlm_rcom_status(ls, nodeid);
+ if (error)
+ break;
+
+ if (rc->rc_result & wait_status)
+ break;
+ if (delay < 1000)
+ delay += 20;
+ msleep(delay);
+ }
+ out:
+ return error;
+}
+
+static int wait_status(struct dlm_ls *ls, uint32_t status)
+{
+ uint32_t status_all = status << 1;
+ int error;
+
+ if (ls->ls_low_nodeid == dlm_our_nodeid()) {
+ error = wait_status_all(ls, status);
+ if (!error)
+ dlm_set_recover_status(ls, status_all);
+ } else
+ error = wait_status_low(ls, status_all);
+
+ return error;
+}
+
+int dlm_recover_members_wait(struct dlm_ls *ls)
+{
+ return wait_status(ls, DLM_RS_NODES);
+}
+
+int dlm_recover_directory_wait(struct dlm_ls *ls)
+{
+ return wait_status(ls, DLM_RS_DIR);
+}
+
+int dlm_recover_locks_wait(struct dlm_ls *ls)
+{
+ return wait_status(ls, DLM_RS_LOCKS);
+}
+
+int dlm_recover_done_wait(struct dlm_ls *ls)
+{
+ return wait_status(ls, DLM_RS_DONE);
+}
+
+/*
+ * The recover_list contains all the rsb's for which we've requested the new
+ * master nodeid. As replies are returned from the resource directories the
+ * rsb's are removed from the list. When the list is empty we're done.
+ *
+ * The recover_list is later similarly used for all rsb's for which we've sent
+ * new lkb's and need to receive new corresponding lkid's.
+ *
+ * We use the address of the rsb struct as a simple local identifier for the
+ * rsb so we can match an rcom reply with the rsb it was sent for.
+ */
+
+static int recover_list_empty(struct dlm_ls *ls)
+{
+ int empty;
+
+ spin_lock(&ls->ls_recover_list_lock);
+ empty = list_empty(&ls->ls_recover_list);
+ spin_unlock(&ls->ls_recover_list_lock);
+
+ return empty;
+}
+
+static void recover_list_add(struct dlm_rsb *r)
+{
+ struct dlm_ls *ls = r->res_ls;
+
+ spin_lock(&ls->ls_recover_list_lock);
+ if (list_empty(&r->res_recover_list)) {
+ list_add_tail(&r->res_recover_list, &ls->ls_recover_list);
+ ls->ls_recover_list_count++;
+ dlm_hold_rsb(r);
+ }
+ spin_unlock(&ls->ls_recover_list_lock);
+}
+
+static void recover_list_del(struct dlm_rsb *r)
+{
+ struct dlm_ls *ls = r->res_ls;
+
+ spin_lock(&ls->ls_recover_list_lock);
+ list_del_init(&r->res_recover_list);
+ ls->ls_recover_list_count--;
+ spin_unlock(&ls->ls_recover_list_lock);
+
+ dlm_put_rsb(r);
+}
+
+static struct dlm_rsb *recover_list_find(struct dlm_ls *ls, uint64_t id)
+{
+ struct dlm_rsb *r = NULL;
+
+ spin_lock(&ls->ls_recover_list_lock);
+
+ list_for_each_entry(r, &ls->ls_recover_list, res_recover_list) {
+ if (id == (unsigned long) r)
+ goto out;
+ }
+ r = NULL;
+ out:
+ spin_unlock(&ls->ls_recover_list_lock);
+ return r;
+}
+
+static void recover_list_clear(struct dlm_ls *ls)
+{
+ struct dlm_rsb *r, *s;
+
+ spin_lock(&ls->ls_recover_list_lock);
+ list_for_each_entry_safe(r, s, &ls->ls_recover_list, res_recover_list) {
+ list_del_init(&r->res_recover_list);
+ dlm_put_rsb(r);
+ ls->ls_recover_list_count--;
+ }
+
+ if (ls->ls_recover_list_count != 0) {
+ log_error(ls, "warning: recover_list_count %d",
+ ls->ls_recover_list_count);
+ ls->ls_recover_list_count = 0;
+ }
+ spin_unlock(&ls->ls_recover_list_lock);
+}
+
+
+/* Master recovery: find new master node for rsb's that were
+ mastered on nodes that have been removed.
+
+ dlm_recover_masters
+ recover_master
+ dlm_send_rcom_lookup -> receive_rcom_lookup
+ dlm_dir_lookup
+ receive_rcom_lookup_reply <-
+ dlm_recover_master_reply
+ set_new_master
+ set_master_lkbs
+ set_lock_master
+*/
+
+/*
+ * Set the lock master for all LKBs in a lock queue
+ * If we are the new master of the rsb, we may have received new
+ * MSTCPY locks from other nodes already which we need to ignore
+ * when setting the new nodeid.
+ */
+
+static void set_lock_master(struct list_head *queue, int nodeid)
+{
+ struct dlm_lkb *lkb;
+
+ list_for_each_entry(lkb, queue, lkb_statequeue)
+ if (!(lkb->lkb_flags & DLM_IFL_MSTCPY))
+ lkb->lkb_nodeid = nodeid;
+}
+
+static void set_master_lkbs(struct dlm_rsb *r)
+{
+ set_lock_master(&r->res_grantqueue, r->res_nodeid);
+ set_lock_master(&r->res_convertqueue, r->res_nodeid);
+ set_lock_master(&r->res_waitqueue, r->res_nodeid);
+}
+
+/*
+ * Propogate the new master nodeid to locks
+ * The NEW_MASTER flag tells dlm_recover_locks() which rsb's to consider.
+ * The NEW_MASTER2 flag tells recover_lvb() which rsb's to consider.
+ */
+
+static void set_new_master(struct dlm_rsb *r, int nodeid)
+{
+ lock_rsb(r);
+ 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);
+}
+
+/*
+ * We do async lookups on rsb's that need new masters. The rsb's
+ * waiting for a lookup reply are kept on the recover_list.
+ */
+
+static int recover_master(struct dlm_rsb *r)
+{
+ struct dlm_ls *ls = r->res_ls;
+ int error, dir_nodeid, ret_nodeid, our_nodeid = dlm_our_nodeid();
+
+ dir_nodeid = dlm_dir_nodeid(r);
+
+ if (dir_nodeid == our_nodeid) {
+ error = dlm_dir_lookup(ls, our_nodeid, r->res_name,
+ r->res_length, &ret_nodeid);
+ 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);
+ error = dlm_send_rcom_lookup(r, dir_nodeid);
+ }
+
+ return error;
+}
+
+/*
+ * 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
+ * we'll discover in this lookup if we're the new master of any rsb's.
+ *
+ * We fire off all the dir lookup requests individually and asynchronously to
+ * the correct dir node.
+ */
+
+int dlm_recover_masters(struct dlm_ls *ls)
+{
+ struct dlm_rsb *r;
+ 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 (dlm_recovery_stopped(ls)) {
+ up_read(&ls->ls_root_sem);
+ error = -EINTR;
+ goto out;
+ }
+
+ 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++;
+ }
+
+ schedule();
+ }
+ up_read(&ls->ls_root_sem);
+
+ log_debug(ls, "dlm_recover_masters %d resources", count);
+
+ error = dlm_wait_function(ls, &recover_list_empty);
+ out:
+ if (error)
+ recover_list_clear(ls);
+ return error;
+}
+
+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) {
+ log_error(ls, "dlm_recover_master_reply no id %"PRIx64"",
+ rc->rc_id);
+ goto out;
+ }
+
+ 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))
+ wake_up(&ls->ls_wait_general);
+ out:
+ return 0;
+}
+
+
+/* Lock recovery: rebuild the process-copy locks we hold on a
+ remastered rsb on the new rsb master.
+
+ dlm_recover_locks
+ recover_locks
+ recover_locks_queue
+ dlm_send_rcom_lock -> receive_rcom_lock
+ dlm_recover_master_copy
+ receive_rcom_lock_reply <-
+ dlm_recover_process_copy
+*/
+
+
+/*
+ * keep a count of the number of lkb's we send to the new master; when we get
+ * an equal number of replies then recovery for the rsb is done
+ */
+
+static int recover_locks_queue(struct dlm_rsb *r, struct list_head *head)
+{
+ struct dlm_lkb *lkb;
+ int error = 0;
+
+ list_for_each_entry(lkb, head, lkb_statequeue) {
+ error = dlm_send_rcom_lock(r, lkb);
+ if (error)
+ break;
+ r->res_recover_locks_count++;
+ }
+
+ return error;
+}
+
+static int all_queues_empty(struct dlm_rsb *r)
+{
+ if (!list_empty(&r->res_grantqueue) ||
+ !list_empty(&r->res_convertqueue) ||
+ !list_empty(&r->res_waitqueue))
+ return FALSE;
+ return TRUE;
+}
+
+static int recover_locks(struct dlm_rsb *r)
+{
+ int error = 0;
+
+ lock_rsb(r);
+ if (all_queues_empty(r))
+ goto out;
+
+ DLM_ASSERT(!r->res_recover_locks_count, dlm_print_rsb(r););
+
+ error = recover_locks_queue(r, &r->res_grantqueue);
+ if (error)
+ goto out;
+ error = recover_locks_queue(r, &r->res_convertqueue);
+ if (error)
+ goto out;
+ error = recover_locks_queue(r, &r->res_waitqueue);
+ if (error)
+ goto out;
+
+ if (r->res_recover_locks_count)
+ recover_list_add(r);
+ else
+ rsb_clear_flag(r, RSB_NEW_MASTER);
+ out:
+ unlock_rsb(r);
+ return error;
+}
+
+int dlm_recover_locks(struct dlm_ls *ls)
+{
+ struct dlm_rsb *r;
+ int error, count = 0;
+
+ log_debug(ls, "dlm_recover_locks");
+
+ down_read(&ls->ls_root_sem);
+ list_for_each_entry(r, &ls->ls_root_list, res_root_list) {
+ if (is_master(r)) {
+ rsb_clear_flag(r, RSB_NEW_MASTER);
+ continue;
+ }
+
+ if (!rsb_flag(r, RSB_NEW_MASTER))
+ continue;
+
+ if (dlm_recovery_stopped(ls)) {
+ error = -EINTR;
+ up_read(&ls->ls_root_sem);
+ goto out;
+ }
+
+ error = recover_locks(r);
+ if (error) {
+ up_read(&ls->ls_root_sem);
+ goto out;
+ }
+
+ count += r->res_recover_locks_count;
+ }
+ up_read(&ls->ls_root_sem);
+
+ log_debug(ls, "dlm_recover_locks %d locks", count);
+
+ error = dlm_wait_function(ls, &recover_list_empty);
+ out:
+ if (error)
+ recover_list_clear(ls);
+ else
+ dlm_set_recover_status(ls, DLM_RS_LOCKS);
+ return error;
+}
+
+void dlm_recovered_lock(struct dlm_rsb *r)
+{
+ DLM_ASSERT(rsb_flag(r, RSB_NEW_MASTER), dlm_print_rsb(r););
+
+ r->res_recover_locks_count--;
+ if (!r->res_recover_locks_count) {
+ rsb_clear_flag(r, RSB_NEW_MASTER);
+ recover_list_del(r);
+ }
+
+ if (recover_list_empty(r->res_ls))
+ wake_up(&r->res_ls->ls_wait_general);
+}
+
+/*
+ * The lvb needs to be recovered on all master rsb's. This includes setting
+ * the VALNOTVALID flag if necessary, and determining the correct lvb contents
+ * based on the lvb's of the locks held on the rsb.
+ *
+ * RSB_VALNOTVALID is set if there are only NL/CR locks on the rsb. If it
+ * was already set prior to recovery, it's not cleared, regardless of locks.
+ *
+ * The LVB contents are only considered for changing when this is a new master
+ * of the rsb (NEW_MASTER2). Then, the rsb's lvb is taken from any lkb with
+ * mode > CR. If no lkb's exist with mode above CR, the lvb contents are taken
+ * from the lkb with the largest lvb sequence number.
+ */
+
+static void recover_lvb(struct dlm_rsb *r)
+{
+ struct dlm_lkb *lkb, *high_lkb = NULL;
+ uint32_t high_seq = 0;
+ int lock_lvb_exists = FALSE;
+ int big_lock_exists = FALSE;
+ int lvblen = r->res_ls->ls_lvblen;
+
+ list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) {
+ if (!(lkb->lkb_exflags & DLM_LKF_VALBLK))
+ continue;
+
+ lock_lvb_exists = TRUE;
+
+ if (lkb->lkb_grmode > DLM_LOCK_CR) {
+ big_lock_exists = TRUE;
+ goto setflag;
+ }
+
+ if (((int)lkb->lkb_lvbseq - (int)high_seq) >= 0) {
+ high_lkb = lkb;
+ high_seq = lkb->lkb_lvbseq;
+ }
+ }
+
+ list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) {
+ if (!(lkb->lkb_exflags & DLM_LKF_VALBLK))
+ continue;
+
+ lock_lvb_exists = TRUE;
+
+ if (lkb->lkb_grmode > DLM_LOCK_CR) {
+ big_lock_exists = TRUE;
+ goto setflag;
+ }
+
+ if (((int)lkb->lkb_lvbseq - (int)high_seq) >= 0) {
+ high_lkb = lkb;
+ high_seq = lkb->lkb_lvbseq;
+ }
+ }
+
+ setflag:
+ if (!lock_lvb_exists)
+ goto out;
+
+ if (!big_lock_exists)
+ rsb_set_flag(r, RSB_VALNOTVALID);
+
+ /* don't mess with the lvb unless we're the new master */
+ if (!rsb_flag(r, RSB_NEW_MASTER2))
+ goto out;
+
+ if (!r->res_lvbptr) {
+ r->res_lvbptr = allocate_lvb(r->res_ls);
+ if (!r->res_lvbptr)
+ goto out;
+ }
+
+ if (big_lock_exists) {
+ r->res_lvbseq = lkb->lkb_lvbseq;
+ memcpy(r->res_lvbptr, lkb->lkb_lvbptr, lvblen);
+ } else if (high_lkb) {
+ r->res_lvbseq = high_lkb->lkb_lvbseq;
+ memcpy(r->res_lvbptr, high_lkb->lkb_lvbptr, lvblen);
+ } else {
+ r->res_lvbseq = 0;
+ memset(r->res_lvbptr, 0, lvblen);
+ }
+ out:
+ return;
+}
+
+/* All master rsb's flagged RECOVER_CONVERT need to be looked at. The locks
+ converting PR->CW or CW->PR need to have their lkb_grmode set. */
+
+static void recover_conversion(struct dlm_rsb *r)
+{
+ struct dlm_lkb *lkb;
+ int grmode = -1;
+
+ list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) {
+ if (lkb->lkb_grmode == DLM_LOCK_PR ||
+ lkb->lkb_grmode == DLM_LOCK_CW) {
+ grmode = lkb->lkb_grmode;
+ break;
+ }
+ }
+
+ list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) {
+ if (lkb->lkb_grmode != DLM_LOCK_IV)
+ continue;
+ if (grmode == -1)
+ lkb->lkb_grmode = lkb->lkb_rqmode;
+ else
+ lkb->lkb_grmode = grmode;
+ }
+}
+
+void dlm_recover_rsbs(struct dlm_ls *ls)
+{
+ struct dlm_rsb *r;
+ int count = 0;
+
+ log_debug(ls, "dlm_recover_rsbs");
+
+ down_read(&ls->ls_root_sem);
+ list_for_each_entry(r, &ls->ls_root_list, res_root_list) {
+ lock_rsb(r);
+ if (is_master(r)) {
+ if (rsb_flag(r, RSB_RECOVER_CONVERT))
+ recover_conversion(r);
+ recover_lvb(r);
+ count++;
+ }
+ rsb_clear_flag(r, RSB_RECOVER_CONVERT);
+ unlock_rsb(r);
+ }
+ up_read(&ls->ls_root_sem);
+
+ log_debug(ls, "dlm_recover_rsbs %d rsbs", count);
+}
+
+/* Create a single list of all root rsb's to be used during recovery */
+
+int dlm_create_root_list(struct dlm_ls *ls)
+{
+ struct dlm_rsb *r;
+ int i, error = 0;
+
+ down_write(&ls->ls_root_sem);
+ if (!list_empty(&ls->ls_root_list)) {
+ log_error(ls, "root list not empty");
+ error = -EINVAL;
+ goto out;
+ }
+
+ for (i = 0; i < ls->ls_rsbtbl_size; i++) {
+ read_lock(&ls->ls_rsbtbl[i].lock);
+ list_for_each_entry(r, &ls->ls_rsbtbl[i].list, res_hashchain) {
+ list_add(&r->res_root_list, &ls->ls_root_list);
+ dlm_hold_rsb(r);
+ }
+ read_unlock(&ls->ls_rsbtbl[i].lock);
+ }
+ out:
+ up_write(&ls->ls_root_sem);
+ return error;
+}
+
+void dlm_release_root_list(struct dlm_ls *ls)
+{
+ struct dlm_rsb *r, *safe;
+
+ down_write(&ls->ls_root_sem);
+ list_for_each_entry_safe(r, safe, &ls->ls_root_list, res_root_list) {
+ list_del_init(&r->res_root_list);
+ dlm_put_rsb(r);
+ }
+ up_write(&ls->ls_root_sem);
+}
+
+void dlm_clear_toss_list(struct dlm_ls *ls)
+{
+ struct dlm_rsb *r, *safe;
+ int i;
+
+ for (i = 0; i < ls->ls_rsbtbl_size; i++) {
+ write_lock(&ls->ls_rsbtbl[i].lock);
+ list_for_each_entry_safe(r, safe, &ls->ls_rsbtbl[i].toss,
+ res_hashchain) {
+ list_del(&r->res_hashchain);
+ free_rsb(r);
+ }
+ write_unlock(&ls->ls_rsbtbl[i].lock);
+ }
+}
+
diff --git a/fs/dlm/recover.h b/fs/dlm/recover.h
new file mode 100644
index 0000000..ebd0363
--- /dev/null
+++ b/fs/dlm/recover.h
@@ -0,0 +1,34 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#ifndef __RECOVER_DOT_H__
+#define __RECOVER_DOT_H__
+
+int dlm_wait_function(struct dlm_ls *ls, int (*testfn) (struct dlm_ls *ls));
+uint32_t dlm_recover_status(struct dlm_ls *ls);
+void dlm_set_recover_status(struct dlm_ls *ls, uint32_t status);
+int dlm_recover_members_wait(struct dlm_ls *ls);
+int dlm_recover_directory_wait(struct dlm_ls *ls);
+int dlm_recover_locks_wait(struct dlm_ls *ls);
+int dlm_recover_done_wait(struct dlm_ls *ls);
+int dlm_recover_masters(struct dlm_ls *ls);
+int dlm_recover_master_reply(struct dlm_ls *ls, struct dlm_rcom *rc);
+int dlm_recover_locks(struct dlm_ls *ls);
+void dlm_recovered_lock(struct dlm_rsb *r);
+int dlm_create_root_list(struct dlm_ls *ls);
+void dlm_release_root_list(struct dlm_ls *ls);
+void dlm_clear_toss_list(struct dlm_ls *ls);
+void dlm_recover_rsbs(struct dlm_ls *ls);
+
+#endif /* __RECOVER_DOT_H__ */
+
diff --git a/fs/dlm/recoverd.c b/fs/dlm/recoverd.c
new file mode 100644
index 0000000..06e4f7c
--- /dev/null
+++ b/fs/dlm/recoverd.c
@@ -0,0 +1,285 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#include "dlm_internal.h"
+#include "lockspace.h"
+#include "member.h"
+#include "dir.h"
+#include "ast.h"
+#include "recover.h"
+#include "lowcomms.h"
+#include "lock.h"
+#include "requestqueue.h"
+#include "recoverd.h"
+
+
+/* If the start for which we're re-enabling locking (seq) has been superseded
+ by a newer stop (ls_recover_seq), we need to leave locking disabled. */
+
+static int enable_locking(struct dlm_ls *ls, uint64_t seq)
+{
+ int error = -EINTR;
+
+ spin_lock(&ls->ls_recover_lock);
+ if (ls->ls_recover_seq == seq) {
+ set_bit(LSFL_RUNNING, &ls->ls_flags);
+ up_write(&ls->ls_in_recovery);
+ error = 0;
+ }
+ spin_unlock(&ls->ls_recover_lock);
+ return error;
+}
+
+static int ls_recover(struct dlm_ls *ls, struct dlm_recover *rv)
+{
+ unsigned long start;
+ int error, neg = 0;
+
+ log_debug(ls, "recover %"PRIx64"", rv->seq);
+
+ down(&ls->ls_recoverd_active);
+
+ /*
+ * Suspending and resuming dlm_astd ensures that no lkb's from this ls
+ * will be processed by dlm_astd during recovery.
+ */
+
+ dlm_astd_suspend();
+ dlm_astd_resume();
+
+ /*
+ * This list of root rsb's will be the basis of most of the recovery
+ * routines.
+ */
+
+ dlm_create_root_list(ls);
+
+ /*
+ * Free all the tossed rsb's so we don't have to recover them.
+ */
+
+ dlm_clear_toss_list(ls);
+
+ /*
+ * Add or remove nodes from the lockspace's ls_nodes list.
+ * Also waits for all nodes to complete dlm_recover_members.
+ */
+
+ error = dlm_recover_members(ls, rv, &neg);
+ if (error) {
+ log_error(ls, "recover_members failed %d", error);
+ goto fail;
+ }
+ start = jiffies;
+
+ /*
+ * Rebuild our own share of the directory by collecting from all other
+ * nodes their master rsb names that hash to us.
+ */
+
+ error = dlm_recover_directory(ls);
+ if (error) {
+ log_error(ls, "recover_directory failed %d", error);
+ goto fail;
+ }
+
+ /*
+ * Purge directory-related requests that are saved in requestqueue.
+ * All dir requests from before recovery are invalid now due to the dir
+ * rebuild and will be resent by the requesting nodes.
+ */
+
+ dlm_purge_requestqueue(ls);
+
+ /*
+ * Wait for all nodes to complete directory rebuild.
+ */
+
+ error = dlm_recover_directory_wait(ls);
+ if (error) {
+ log_error(ls, "recover_directory_wait failed %d", error);
+ goto fail;
+ }
+
+ /*
+ * We may have outstanding operations that are waiting for a reply from
+ * a failed node. Mark these to be resent after recovery. Unlock and
+ * cancel ops can just be completed.
+ */
+
+ dlm_recover_waiters_pre(ls);
+
+ error = dlm_recovery_stopped(ls);
+ if (error)
+ goto fail;
+
+ if (neg || dlm_no_directory(ls)) {
+ /*
+ * Clear lkb's for departed nodes.
+ */
+
+ dlm_purge_locks(ls);
+
+ /*
+ * Get new master nodeid's for rsb's that were mastered on
+ * departed nodes.
+ */
+
+ error = dlm_recover_masters(ls);
+ if (error) {
+ log_error(ls, "recover_masters failed %d", error);
+ goto fail;
+ }
+
+ /*
+ * Send our locks on remastered rsb's to the new masters.
+ */
+
+ error = dlm_recover_locks(ls);
+ if (error) {
+ log_error(ls, "recover_locks failed %d", error);
+ goto fail;
+ }
+
+ error = dlm_recover_locks_wait(ls);
+ if (error) {
+ log_error(ls, "recover_locks_wait failed %d", error);
+ goto fail;
+ }
+
+ /*
+ * Finalize state in master rsb's now that all locks can be
+ * checked. This includes conversion resolution and lvb
+ * settings.
+ */
+
+ dlm_recover_rsbs(ls);
+ }
+
+ dlm_release_root_list(ls);
+
+ dlm_set_recover_status(ls, DLM_RS_DONE);
+ error = dlm_recover_done_wait(ls);
+ if (error) {
+ log_error(ls, "recover_done_wait failed %d", error);
+ goto fail;
+ }
+
+ dlm_clear_members_gone(ls);
+
+ error = enable_locking(ls, rv->seq);
+ if (error) {
+ log_error(ls, "enable_locking failed %d", error);
+ goto fail;
+ }
+
+ error = dlm_process_requestqueue(ls);
+ if (error) {
+ log_error(ls, "process_requestqueue failed %d", error);
+ goto fail;
+ }
+
+ error = dlm_recover_waiters_post(ls);
+ if (error) {
+ log_error(ls, "recover_waiters_post failed %d", error);
+ goto fail;
+ }
+
+ dlm_grant_after_purge(ls);
+
+ dlm_astd_wake();
+
+ log_debug(ls, "recover %"PRIx64" done: %u ms", rv->seq,
+ jiffies_to_msecs(jiffies - start));
+ up(&ls->ls_recoverd_active);
+
+ return 0;
+
+ fail:
+ dlm_release_root_list(ls);
+ log_debug(ls, "recover %"PRIx64" error %d", rv->seq, error);
+ up(&ls->ls_recoverd_active);
+ return error;
+}
+
+static void do_ls_recovery(struct dlm_ls *ls)
+{
+ struct dlm_recover *rv = NULL;
+
+ spin_lock(&ls->ls_recover_lock);
+ rv = ls->ls_recover_args;
+ ls->ls_recover_args = NULL;
+ clear_bit(LSFL_RECOVERY_STOP, &ls->ls_flags);
+ spin_unlock(&ls->ls_recover_lock);
+
+ if (rv) {
+ ls_recover(ls, rv);
+ kfree(rv->nodeids);
+ kfree(rv);
+ }
+}
+
+static int dlm_recoverd(void *arg)
+{
+ struct dlm_ls *ls;
+
+ ls = dlm_find_lockspace_local(arg);
+
+ while (!kthread_should_stop()) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (!test_bit(LSFL_WORK, &ls->ls_flags))
+ schedule();
+ set_current_state(TASK_RUNNING);
+
+ if (test_and_clear_bit(LSFL_WORK, &ls->ls_flags))
+ do_ls_recovery(ls);
+ }
+
+ dlm_put_lockspace(ls);
+ return 0;
+}
+
+void dlm_recoverd_kick(struct dlm_ls *ls)
+{
+ set_bit(LSFL_WORK, &ls->ls_flags);
+ wake_up_process(ls->ls_recoverd_task);
+}
+
+int dlm_recoverd_start(struct dlm_ls *ls)
+{
+ struct task_struct *p;
+ int error = 0;
+
+ p = kthread_run(dlm_recoverd, ls, "dlm_recoverd");
+ if (IS_ERR(p))
+ error = PTR_ERR(p);
+ else
+ ls->ls_recoverd_task = p;
+ return error;
+}
+
+void dlm_recoverd_stop(struct dlm_ls *ls)
+{
+ kthread_stop(ls->ls_recoverd_task);
+}
+
+void dlm_recoverd_suspend(struct dlm_ls *ls)
+{
+ down(&ls->ls_recoverd_active);
+}
+
+void dlm_recoverd_resume(struct dlm_ls *ls)
+{
+ up(&ls->ls_recoverd_active);
+}
+
diff --git a/fs/dlm/recoverd.h b/fs/dlm/recoverd.h
new file mode 100644
index 0000000..866657c
--- /dev/null
+++ b/fs/dlm/recoverd.h
@@ -0,0 +1,24 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#ifndef __RECOVERD_DOT_H__
+#define __RECOVERD_DOT_H__
+
+void dlm_recoverd_kick(struct dlm_ls *ls);
+void dlm_recoverd_stop(struct dlm_ls *ls);
+int dlm_recoverd_start(struct dlm_ls *ls);
+void dlm_recoverd_suspend(struct dlm_ls *ls);
+void dlm_recoverd_resume(struct dlm_ls *ls);
+
+#endif /* __RECOVERD_DOT_H__ */
+
diff --git a/fs/dlm/requestqueue.c b/fs/dlm/requestqueue.c
new file mode 100644
index 0000000..36afe99
--- /dev/null
+++ b/fs/dlm/requestqueue.c
@@ -0,0 +1,184 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) 2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#include "dlm_internal.h"
+#include "member.h"
+#include "lock.h"
+#include "dir.h"
+#include "config.h"
+#include "requestqueue.h"
+
+struct rq_entry {
+ struct list_head list;
+ int nodeid;
+ char request[1];
+};
+
+/*
+ * Requests received while the lockspace is in recovery get added to the
+ * request queue and processed when recovery is complete. This happens when
+ * the lockspace is suspended on some nodes before it is on others, or the
+ * lockspace is enabled on some while still suspended on others.
+ */
+
+void dlm_add_requestqueue(struct dlm_ls *ls, int nodeid, struct dlm_header *hd)
+{
+ struct rq_entry *e;
+ int length = hd->h_length;
+
+ if (dlm_is_removed(ls, nodeid))
+ return;
+
+ e = kmalloc(sizeof(struct rq_entry) + length, GFP_KERNEL);
+ if (!e) {
+ log_print("dlm_add_requestqueue: out of memory\n");
+ return;
+ }
+
+ e->nodeid = nodeid;
+ memcpy(e->request, hd, length);
+
+ down(&ls->ls_requestqueue_lock);
+ list_add_tail(&e->list, &ls->ls_requestqueue);
+ up(&ls->ls_requestqueue_lock);
+}
+
+int dlm_process_requestqueue(struct dlm_ls *ls)
+{
+ struct rq_entry *e;
+ struct dlm_header *hd;
+ int error = 0;
+
+ down(&ls->ls_requestqueue_lock);
+
+ for (;;) {
+ if (list_empty(&ls->ls_requestqueue)) {
+ up(&ls->ls_requestqueue_lock);
+ error = 0;
+ break;
+ }
+ e = list_entry(ls->ls_requestqueue.next, struct rq_entry, list);
+ up(&ls->ls_requestqueue_lock);
+
+ hd = (struct dlm_header *) e->request;
+ error = dlm_receive_message(hd, e->nodeid, TRUE);
+
+ if (error == -EINTR) {
+ /* entry is left on requestqueue */
+ log_debug(ls, "process_requestqueue abort eintr");
+ break;
+ }
+
+ down(&ls->ls_requestqueue_lock);
+ list_del(&e->list);
+ kfree(e);
+
+ if (dlm_locking_stopped(ls)) {
+ log_debug(ls, "process_requestqueue abort running");
+ up(&ls->ls_requestqueue_lock);
+ error = -EINTR;
+ break;
+ }
+ schedule();
+ }
+
+ return error;
+}
+
+/*
+ * After recovery is done, locking is resumed and dlm_recoverd takes all the
+ * saved requests and processes them as they would have been by dlm_recvd. At
+ * the same time, dlm_recvd will start receiving new requests from remote
+ * nodes. We want to delay dlm_recvd processing new requests until
+ * dlm_recoverd has finished processing the old saved requests.
+ */
+
+void dlm_wait_requestqueue(struct dlm_ls *ls)
+{
+ for (;;) {
+ down(&ls->ls_requestqueue_lock);
+ if (list_empty(&ls->ls_requestqueue))
+ break;
+ if (dlm_locking_stopped(ls))
+ break;
+ up(&ls->ls_requestqueue_lock);
+ schedule();
+ }
+ up(&ls->ls_requestqueue_lock);
+}
+
+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;
+
+ down(&ls->ls_requestqueue_lock);
+ list_for_each_entry_safe(e, safe, &ls->ls_requestqueue, list) {
+ ms = (struct dlm_message *) e->request;
+
+ if (purge_request(ls, ms, e->nodeid)) {
+ list_del(&e->list);
+ kfree(e);
+ }
+ }
+ up(&ls->ls_requestqueue_lock);
+}
+
diff --git a/fs/dlm/requestqueue.h b/fs/dlm/requestqueue.h
new file mode 100644
index 0000000..349f0d2
--- /dev/null
+++ b/fs/dlm/requestqueue.h
@@ -0,0 +1,22 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) 2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#ifndef __REQUESTQUEUE_DOT_H__
+#define __REQUESTQUEUE_DOT_H__
+
+void dlm_add_requestqueue(struct dlm_ls *ls, int nodeid, struct dlm_header *hd);
+int dlm_process_requestqueue(struct dlm_ls *ls);
+void dlm_wait_requestqueue(struct dlm_ls *ls);
+void dlm_purge_requestqueue(struct dlm_ls *ls);
+
+#endif
+
diff --git a/fs/dlm/util.c b/fs/dlm/util.c
new file mode 100644
index 0000000..826d122
--- /dev/null
+++ b/fs/dlm/util.c
@@ -0,0 +1,173 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) 2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#include "dlm_internal.h"
+#include "rcom.h"
+#include "util.h"
+
+static void header_out(struct dlm_header *hd)
+{
+ hd->h_version = cpu_to_le32(hd->h_version);
+ hd->h_lockspace = cpu_to_le32(hd->h_lockspace);
+ hd->h_nodeid = cpu_to_le32(hd->h_nodeid);
+ hd->h_length = cpu_to_le16(hd->h_length);
+}
+
+static void header_in(struct dlm_header *hd)
+{
+ hd->h_version = le32_to_cpu(hd->h_version);
+ hd->h_lockspace = le32_to_cpu(hd->h_lockspace);
+ hd->h_nodeid = le32_to_cpu(hd->h_nodeid);
+ hd->h_length = le16_to_cpu(hd->h_length);
+}
+
+void dlm_message_out(struct dlm_message *ms)
+{
+ struct dlm_header *hd = (struct dlm_header *) ms;
+
+ header_out(hd);
+
+ ms->m_type = cpu_to_le32(ms->m_type);
+ ms->m_nodeid = cpu_to_le32(ms->m_nodeid);
+ ms->m_pid = cpu_to_le32(ms->m_pid);
+ ms->m_lkid = cpu_to_le32(ms->m_lkid);
+ ms->m_remid = cpu_to_le32(ms->m_remid);
+ ms->m_parent_lkid = cpu_to_le32(ms->m_parent_lkid);
+ ms->m_parent_remid = cpu_to_le32(ms->m_parent_remid);
+ ms->m_exflags = cpu_to_le32(ms->m_exflags);
+ 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);
+ ms->m_bastmode = cpu_to_le32(ms->m_bastmode);
+ ms->m_asts = cpu_to_le32(ms->m_asts);
+ ms->m_result = cpu_to_le32(ms->m_result);
+ ms->m_range[0] = cpu_to_le64(ms->m_range[0]);
+ ms->m_range[1] = cpu_to_le64(ms->m_range[1]);
+}
+
+void dlm_message_in(struct dlm_message *ms)
+{
+ struct dlm_header *hd = (struct dlm_header *) ms;
+
+ header_in(hd);
+
+ ms->m_type = le32_to_cpu(ms->m_type);
+ ms->m_nodeid = le32_to_cpu(ms->m_nodeid);
+ ms->m_pid = le32_to_cpu(ms->m_pid);
+ ms->m_lkid = le32_to_cpu(ms->m_lkid);
+ ms->m_remid = le32_to_cpu(ms->m_remid);
+ ms->m_parent_lkid = le32_to_cpu(ms->m_parent_lkid);
+ ms->m_parent_remid = le32_to_cpu(ms->m_parent_remid);
+ ms->m_exflags = le32_to_cpu(ms->m_exflags);
+ 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);
+ ms->m_bastmode = le32_to_cpu(ms->m_bastmode);
+ ms->m_asts = le32_to_cpu(ms->m_asts);
+ ms->m_result = le32_to_cpu(ms->m_result);
+ ms->m_range[0] = le64_to_cpu(ms->m_range[0]);
+ ms->m_range[1] = le64_to_cpu(ms->m_range[1]);
+}
+
+static void rcom_lock_out(struct rcom_lock *rl)
+{
+ rl->rl_ownpid = cpu_to_le32(rl->rl_ownpid);
+ rl->rl_lkid = cpu_to_le32(rl->rl_lkid);
+ rl->rl_remid = cpu_to_le32(rl->rl_remid);
+ rl->rl_parent_lkid = cpu_to_le32(rl->rl_parent_lkid);
+ rl->rl_parent_remid = cpu_to_le32(rl->rl_parent_remid);
+ rl->rl_exflags = cpu_to_le32(rl->rl_exflags);
+ rl->rl_flags = cpu_to_le32(rl->rl_flags);
+ rl->rl_lvbseq = cpu_to_le32(rl->rl_lvbseq);
+ rl->rl_result = cpu_to_le32(rl->rl_result);
+ rl->rl_wait_type = cpu_to_le16(rl->rl_wait_type);
+ rl->rl_namelen = cpu_to_le16(rl->rl_namelen);
+ rl->rl_range[0] = cpu_to_le64(rl->rl_range[0]);
+ rl->rl_range[1] = cpu_to_le64(rl->rl_range[1]);
+ rl->rl_range[2] = cpu_to_le64(rl->rl_range[2]);
+ rl->rl_range[3] = cpu_to_le64(rl->rl_range[3]);
+}
+
+static void rcom_lock_in(struct rcom_lock *rl)
+{
+ rl->rl_ownpid = le32_to_cpu(rl->rl_ownpid);
+ rl->rl_lkid = le32_to_cpu(rl->rl_lkid);
+ rl->rl_remid = le32_to_cpu(rl->rl_remid);
+ rl->rl_parent_lkid = le32_to_cpu(rl->rl_parent_lkid);
+ rl->rl_parent_remid = le32_to_cpu(rl->rl_parent_remid);
+ rl->rl_exflags = le32_to_cpu(rl->rl_exflags);
+ rl->rl_flags = le32_to_cpu(rl->rl_flags);
+ rl->rl_lvbseq = le32_to_cpu(rl->rl_lvbseq);
+ rl->rl_result = le32_to_cpu(rl->rl_result);
+ rl->rl_wait_type = le16_to_cpu(rl->rl_wait_type);
+ rl->rl_namelen = le16_to_cpu(rl->rl_namelen);
+ rl->rl_range[0] = le64_to_cpu(rl->rl_range[0]);
+ rl->rl_range[1] = le64_to_cpu(rl->rl_range[1]);
+ rl->rl_range[2] = le64_to_cpu(rl->rl_range[2]);
+ rl->rl_range[3] = le64_to_cpu(rl->rl_range[3]);
+}
+
+static void rcom_config_out(struct rcom_config *rf)
+{
+ rf->rf_lvblen = cpu_to_le32(rf->rf_lvblen);
+ rf->rf_lsflags = cpu_to_le32(rf->rf_lsflags);
+}
+
+static void rcom_config_in(struct rcom_config *rf)
+{
+ rf->rf_lvblen = le32_to_cpu(rf->rf_lvblen);
+ rf->rf_lsflags = le32_to_cpu(rf->rf_lsflags);
+}
+
+void dlm_rcom_out(struct dlm_rcom *rc)
+{
+ struct dlm_header *hd = (struct dlm_header *) rc;
+ int type = rc->rc_type;
+
+ header_out(hd);
+
+ rc->rc_type = cpu_to_le32(rc->rc_type);
+ rc->rc_result = cpu_to_le32(rc->rc_result);
+ rc->rc_id = cpu_to_le64(rc->rc_id);
+
+ if (type == DLM_RCOM_LOCK)
+ rcom_lock_out((struct rcom_lock *) rc->rc_buf);
+
+ else if (type == DLM_RCOM_STATUS_REPLY)
+ rcom_config_out((struct rcom_config *) rc->rc_buf);
+}
+
+void dlm_rcom_in(struct dlm_rcom *rc)
+{
+ struct dlm_header *hd = (struct dlm_header *) rc;
+
+ header_in(hd);
+
+ rc->rc_type = le32_to_cpu(rc->rc_type);
+ rc->rc_result = le32_to_cpu(rc->rc_result);
+ rc->rc_id = le64_to_cpu(rc->rc_id);
+
+ if (rc->rc_type == DLM_RCOM_LOCK)
+ rcom_lock_in((struct rcom_lock *) rc->rc_buf);
+
+ else if (rc->rc_type == DLM_RCOM_STATUS_REPLY)
+ rcom_config_in((struct rcom_config *) rc->rc_buf);
+}
+
diff --git a/fs/dlm/util.h b/fs/dlm/util.h
new file mode 100644
index 0000000..2b25915
--- /dev/null
+++ b/fs/dlm/util.h
@@ -0,0 +1,22 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) 2005 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#ifndef __UTIL_DOT_H__
+#define __UTIL_DOT_H__
+
+void dlm_message_out(struct dlm_message *ms);
+void dlm_message_in(struct dlm_message *ms);
+void dlm_rcom_out(struct dlm_rcom *rc);
+void dlm_rcom_in(struct dlm_rcom *rc);
+
+#endif
+