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-rw-r--r--fs/ocfs2/dlmglue.c3
-rw-r--r--fs/ocfs2/stackglue.c111
-rw-r--r--fs/ocfs2/stackglue.h3
3 files changed, 104 insertions, 13 deletions
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
index f62a9e4fc315..394d25a131a5 100644
--- a/fs/ocfs2/dlmglue.c
+++ b/fs/ocfs2/dlmglue.c
@@ -2627,7 +2627,8 @@ int ocfs2_dlm_init(struct ocfs2_super *osb)
}
/* for now, uuid == domain */
- status = ocfs2_cluster_connect(osb->uuid_str,
+ status = ocfs2_cluster_connect(osb->osb_cluster_stack,
+ osb->uuid_str,
strlen(osb->uuid_str),
ocfs2_do_node_down, osb,
&conn);
diff --git a/fs/ocfs2/stackglue.c b/fs/ocfs2/stackglue.c
index 76ae4fcebcbd..bf45d9bff8a7 100644
--- a/fs/ocfs2/stackglue.c
+++ b/fs/ocfs2/stackglue.c
@@ -27,11 +27,17 @@
#include <linux/kobject.h>
#include <linux/sysfs.h>
+#include "ocfs2_fs.h"
+
#include "stackglue.h"
+#define OCFS2_STACK_PLUGIN_O2CB "o2cb"
+#define OCFS2_STACK_PLUGIN_USER "user"
+
static struct ocfs2_locking_protocol *lproto;
static DEFINE_SPINLOCK(ocfs2_stack_lock);
static LIST_HEAD(ocfs2_stack_list);
+static char cluster_stack_name[OCFS2_STACK_LABEL_LEN + 1];
/*
* The stack currently in use. If not null, active_stack->sp_count > 0,
@@ -53,26 +59,36 @@ static struct ocfs2_stack_plugin *ocfs2_stack_lookup(const char *name)
return NULL;
}
-static int ocfs2_stack_driver_request(const char *name)
+static int ocfs2_stack_driver_request(const char *stack_name,
+ const char *plugin_name)
{
int rc;
struct ocfs2_stack_plugin *p;
spin_lock(&ocfs2_stack_lock);
+ /*
+ * If the stack passed by the filesystem isn't the selected one,
+ * we can't continue.
+ */
+ if (strcmp(stack_name, cluster_stack_name)) {
+ rc = -EBUSY;
+ goto out;
+ }
+
if (active_stack) {
/*
* If the active stack isn't the one we want, it cannot
* be selected right now.
*/
- if (!strcmp(active_stack->sp_name, name))
+ if (!strcmp(active_stack->sp_name, plugin_name))
rc = 0;
else
rc = -EBUSY;
goto out;
}
- p = ocfs2_stack_lookup(name);
+ p = ocfs2_stack_lookup(plugin_name);
if (!p || !try_module_get(p->sp_owner)) {
rc = -ENOENT;
goto out;
@@ -94,23 +110,42 @@ out:
* there is no stack, it tries to load it. It will fail if the stack still
* cannot be found. It will also fail if a different stack is in use.
*/
-static int ocfs2_stack_driver_get(const char *name)
+static int ocfs2_stack_driver_get(const char *stack_name)
{
int rc;
+ char *plugin_name = OCFS2_STACK_PLUGIN_O2CB;
+
+ /*
+ * Classic stack does not pass in a stack name. This is
+ * compatible with older tools as well.
+ */
+ if (!stack_name || !*stack_name)
+ stack_name = OCFS2_STACK_PLUGIN_O2CB;
+
+ if (strlen(stack_name) != OCFS2_STACK_LABEL_LEN) {
+ printk(KERN_ERR
+ "ocfs2 passed an invalid cluster stack label: \"%s\"\n",
+ stack_name);
+ return -EINVAL;
+ }
- rc = ocfs2_stack_driver_request(name);
+ /* Anything that isn't the classic stack is a user stack */
+ if (strcmp(stack_name, OCFS2_STACK_PLUGIN_O2CB))
+ plugin_name = OCFS2_STACK_PLUGIN_USER;
+
+ rc = ocfs2_stack_driver_request(stack_name, plugin_name);
if (rc == -ENOENT) {
- request_module("ocfs2_stack_%s", name);
- rc = ocfs2_stack_driver_request(name);
+ request_module("ocfs2_stack_%s", plugin_name);
+ rc = ocfs2_stack_driver_request(stack_name, plugin_name);
}
if (rc == -ENOENT) {
printk(KERN_ERR
"ocfs2: Cluster stack driver \"%s\" cannot be found\n",
- name);
+ plugin_name);
} else if (rc == -EBUSY) {
printk(KERN_ERR
- "ocfs2: A different cluster stack driver is in use\n");
+ "ocfs2: A different cluster stack is in use\n");
}
return rc;
@@ -242,7 +277,8 @@ void ocfs2_dlm_dump_lksb(union ocfs2_dlm_lksb *lksb)
}
EXPORT_SYMBOL_GPL(ocfs2_dlm_dump_lksb);
-int ocfs2_cluster_connect(const char *group,
+int ocfs2_cluster_connect(const char *stack_name,
+ const char *group,
int grouplen,
void (*recovery_handler)(int node_num,
void *recovery_data),
@@ -277,7 +313,7 @@ int ocfs2_cluster_connect(const char *group,
new_conn->cc_version = lproto->lp_max_version;
/* This will pin the stack driver if successful */
- rc = ocfs2_stack_driver_get("o2cb");
+ rc = ocfs2_stack_driver_get(stack_name);
if (rc)
goto out_free;
@@ -416,10 +452,61 @@ static struct kobj_attribute ocfs2_attr_active_cluster_plugin =
__ATTR(active_cluster_plugin, S_IFREG | S_IRUGO,
ocfs2_active_cluster_plugin_show, NULL);
+static ssize_t ocfs2_cluster_stack_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+ ssize_t ret;
+ spin_lock(&ocfs2_stack_lock);
+ ret = snprintf(buf, PAGE_SIZE, "%s\n", cluster_stack_name);
+ spin_unlock(&ocfs2_stack_lock);
+
+ return ret;
+}
+
+static ssize_t ocfs2_cluster_stack_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t count)
+{
+ size_t len = count;
+ ssize_t ret;
+
+ if (len == 0)
+ return len;
+
+ if (buf[len - 1] == '\n')
+ len--;
+
+ if ((len != OCFS2_STACK_LABEL_LEN) ||
+ (strnlen(buf, len) != len))
+ return -EINVAL;
+
+ spin_lock(&ocfs2_stack_lock);
+ if (active_stack) {
+ if (!strncmp(buf, cluster_stack_name, len))
+ ret = count;
+ else
+ ret = -EBUSY;
+ } else {
+ memcpy(cluster_stack_name, buf, len);
+ ret = count;
+ }
+ spin_unlock(&ocfs2_stack_lock);
+
+ return ret;
+}
+
+
+static struct kobj_attribute ocfs2_attr_cluster_stack =
+ __ATTR(cluster_stack, S_IFREG | S_IRUGO | S_IWUSR,
+ ocfs2_cluster_stack_show,
+ ocfs2_cluster_stack_store);
+
static struct attribute *ocfs2_attrs[] = {
&ocfs2_attr_max_locking_protocol.attr,
&ocfs2_attr_loaded_cluster_plugins.attr,
&ocfs2_attr_active_cluster_plugin.attr,
+ &ocfs2_attr_cluster_stack.attr,
NULL,
};
@@ -455,6 +542,8 @@ error:
static int __init ocfs2_stack_glue_init(void)
{
+ strcpy(cluster_stack_name, OCFS2_STACK_PLUGIN_O2CB);
+
return ocfs2_sysfs_init();
}
diff --git a/fs/ocfs2/stackglue.h b/fs/ocfs2/stackglue.h
index c96c8bb76863..d88bc655644b 100644
--- a/fs/ocfs2/stackglue.h
+++ b/fs/ocfs2/stackglue.h
@@ -209,7 +209,8 @@ struct ocfs2_stack_plugin {
/* Used by the filesystem */
-int ocfs2_cluster_connect(const char *group,
+int ocfs2_cluster_connect(const char *stack_name,
+ const char *group,
int grouplen,
void (*recovery_handler)(int node_num,
void *recovery_data),
generated by cgit v1.2.3 (git 2.0.4) at 2024-12-30 21:49:11 +0000