Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mfashe...
[linux-2.6.git] / fs / ocfs2 / stack_user.c
index b503772..353fc35 100644 (file)
@@ -21,6 +21,7 @@
 #include <linux/fs.h>
 #include <linux/miscdevice.h>
 #include <linux/mutex.h>
+#include <linux/smp_lock.h>
 #include <linux/reboot.h>
 #include <asm/uaccess.h>
 
@@ -61,7 +62,7 @@
  * negotiated by the client.  The client negotiates based on the maximum
  * version advertised in /sys/fs/ocfs2/max_locking_protocol.  The major
  * number from the "SETV" message must match
- * user_stack.sp_proto->lp_max_version.pv_major, and the minor number
+ * ocfs2_user_plugin.sp_proto->lp_max_version.pv_major, and the minor number
  * must be less than or equal to ...->lp_max_version.pv_minor.
  *
  * Once this information has been set, mounts will be allowed.  From this
@@ -153,7 +154,7 @@ union ocfs2_control_message {
        struct ocfs2_control_message_down       u_down;
 };
 
-static struct ocfs2_stack_plugin user_stack;
+static struct ocfs2_stack_plugin ocfs2_user_plugin;
 
 static atomic_t ocfs2_control_opened;
 static int ocfs2_control_this_node = -1;
@@ -399,7 +400,7 @@ static int ocfs2_control_do_setversion_msg(struct file *file,
        char *ptr = NULL;
        struct ocfs2_control_private *p = file->private_data;
        struct ocfs2_protocol_version *max =
-               &user_stack.sp_proto->lp_max_version;
+               &ocfs2_user_plugin.sp_proto->lp_max_version;
 
        if (ocfs2_control_get_handshake_state(file) !=
            OCFS2_CONTROL_HANDSHAKE_PROTOCOL)
@@ -549,26 +550,17 @@ static ssize_t ocfs2_control_read(struct file *file,
                                  size_t count,
                                  loff_t *ppos)
 {
-       char *proto_string = OCFS2_CONTROL_PROTO;
-       size_t to_write = 0;
-
-       if (*ppos >= OCFS2_CONTROL_PROTO_LEN)
-               return 0;
-
-       to_write = OCFS2_CONTROL_PROTO_LEN - *ppos;
-       if (to_write > count)
-               to_write = count;
-       if (copy_to_user(buf, proto_string + *ppos, to_write))
-               return -EFAULT;
+       ssize_t ret;
 
-       *ppos += to_write;
+       ret = simple_read_from_buffer(buf, count, ppos,
+                       OCFS2_CONTROL_PROTO, OCFS2_CONTROL_PROTO_LEN);
 
        /* Have we read the whole protocol list? */
-       if (*ppos >= OCFS2_CONTROL_PROTO_LEN)
+       if (ret > 0 && *ppos >= OCFS2_CONTROL_PROTO_LEN)
                ocfs2_control_set_handshake_state(file,
                                                  OCFS2_CONTROL_HANDSHAKE_READ);
 
-       return to_write;
+       return ret;
 }
 
 static int ocfs2_control_release(struct inode *inode, struct file *file)
@@ -619,10 +611,12 @@ static int ocfs2_control_open(struct inode *inode, struct file *file)
                return -ENOMEM;
        p->op_this_node = -1;
 
+       lock_kernel();
        mutex_lock(&ocfs2_control_lock);
        file->private_data = p;
        list_add(&p->op_list, &ocfs2_control_private_list);
        mutex_unlock(&ocfs2_control_lock);
+       unlock_kernel();
 
        return 0;
 }
@@ -680,7 +674,7 @@ static void fsdlm_lock_ast_wrapper(void *astarg)
        struct dlm_lksb *lksb = fsdlm_astarg_to_lksb(astarg);
        int status = lksb->sb_status;
 
-       BUG_ON(user_stack.sp_proto == NULL);
+       BUG_ON(ocfs2_user_plugin.sp_proto == NULL);
 
        /*
         * For now we're punting on the issue of other non-standard errors
@@ -693,16 +687,16 @@ static void fsdlm_lock_ast_wrapper(void *astarg)
         */
 
        if (status == -DLM_EUNLOCK || status == -DLM_ECANCEL)
-               user_stack.sp_proto->lp_unlock_ast(astarg, 0);
+               ocfs2_user_plugin.sp_proto->lp_unlock_ast(astarg, 0);
        else
-               user_stack.sp_proto->lp_lock_ast(astarg);
+               ocfs2_user_plugin.sp_proto->lp_lock_ast(astarg);
 }
 
 static void fsdlm_blocking_ast_wrapper(void *astarg, int level)
 {
-       BUG_ON(user_stack.sp_proto == NULL);
+       BUG_ON(ocfs2_user_plugin.sp_proto == NULL);
 
-       user_stack.sp_proto->lp_blocking_ast(astarg, level);
+       ocfs2_user_plugin.sp_proto->lp_blocking_ast(astarg, level);
 }
 
 static int user_dlm_lock(struct ocfs2_cluster_connection *conn,
@@ -816,8 +810,7 @@ out:
        return rc;
 }
 
-static int user_cluster_disconnect(struct ocfs2_cluster_connection *conn,
-                                  int hangup_pending)
+static int user_cluster_disconnect(struct ocfs2_cluster_connection *conn)
 {
        dlm_release_lockspace(conn->cc_lockspace, 2);
        conn->cc_lockspace = NULL;
@@ -838,7 +831,7 @@ static int user_cluster_this_node(unsigned int *this_node)
        return 0;
 }
 
-static struct ocfs2_stack_operations user_stack_ops = {
+static struct ocfs2_stack_operations ocfs2_user_plugin_ops = {
        .connect        = user_cluster_connect,
        .disconnect     = user_cluster_disconnect,
        .this_node      = user_cluster_this_node,
@@ -849,20 +842,20 @@ static struct ocfs2_stack_operations user_stack_ops = {
        .dump_lksb      = user_dlm_dump_lksb,
 };
 
-static struct ocfs2_stack_plugin user_stack = {
+static struct ocfs2_stack_plugin ocfs2_user_plugin = {
        .sp_name        = "user",
-       .sp_ops         = &user_stack_ops,
+       .sp_ops         = &ocfs2_user_plugin_ops,
        .sp_owner       = THIS_MODULE,
 };
 
 
-static int __init user_stack_init(void)
+static int __init ocfs2_user_plugin_init(void)
 {
        int rc;
 
        rc = ocfs2_control_init();
        if (!rc) {
-               rc = ocfs2_stack_glue_register(&user_stack);
+               rc = ocfs2_stack_glue_register(&ocfs2_user_plugin);
                if (rc)
                        ocfs2_control_exit();
        }
@@ -870,14 +863,14 @@ static int __init user_stack_init(void)
        return rc;
 }
 
-static void __exit user_stack_exit(void)
+static void __exit ocfs2_user_plugin_exit(void)
 {
-       ocfs2_stack_glue_unregister(&user_stack);
+       ocfs2_stack_glue_unregister(&ocfs2_user_plugin);
        ocfs2_control_exit();
 }
 
 MODULE_AUTHOR("Oracle");
 MODULE_DESCRIPTION("ocfs2 driver for userspace cluster stacks");
 MODULE_LICENSE("GPL");
-module_init(user_stack_init);
-module_exit(user_stack_exit);
+module_init(ocfs2_user_plugin_init);
+module_exit(ocfs2_user_plugin_exit);