dlm: interface for purge

Add code to accept purge commands from userland.

Signed-off-by David Teigland <[email protected]>

Index: linux-2.6.21-rc5-quilt/fs/dlm/lock.h
===================================================================

fs/dlm/lock.h +2 -0

@@ -41,6 +41,8 @@
 	uint32_t flags, uint32_t lkid, char *lvb_in);
 int dlm_user_cancel(struct dlm_ls *ls,  struct dlm_user_args *ua_tmp,
 	uint32_t flags, uint32_t lkid);
+int dlm_user_purge(struct dlm_ls *ls, struct dlm_user_proc *proc,
+	int nodeid, int pid);
 void dlm_clear_proc_locks(struct dlm_ls *ls, struct dlm_user_proc *proc);
 
 static inline int is_master(struct dlm_rsb *r)

Index: linux-2.6.21-rc5-quilt/fs/dlm/user.c
===================================================================

fs/dlm/user.c +28 -0

@@ -56,6 +56,7 @@
 	union  {
 		struct dlm_lock_params32 lock;
 		struct dlm_lspace_params lspace;
+		struct dlm_purge_params purge;
 	} i;
 };
 

@@ -92,6 +93,9 @@
 		kb->i.lspace.flags = kb32->i.lspace.flags;
 		kb->i.lspace.minor = kb32->i.lspace.minor;
 		strcpy(kb->i.lspace.name, kb32->i.lspace.name);
+	} else if (kb->cmd == DLM_USER_PURGE) {
+		kb->i.purge.nodeid = kb32->i.purge.nodeid;
+		kb->i.purge.pid = kb32->i.purge.pid;
 	} else {
 		kb->i.lock.mode = kb32->i.lock.mode;
 		kb->i.lock.namelen = kb32->i.lock.namelen;

@@ -297,6 +301,22 @@
 	return error;
 }
 
+static int device_user_purge(struct dlm_user_proc *proc,
+			     struct dlm_purge_params *params)
+{
+	struct dlm_ls *ls;
+	int error;
+
+	ls = dlm_find_lockspace_local(proc->lockspace);
+	if (!ls)
+		return -ENOENT;
+
+	error = dlm_user_purge(ls, proc, params->nodeid, params->pid);
+
+	dlm_put_lockspace(ls);
+	return error;
+}
+
 static int device_create_lockspace(struct dlm_lspace_params *params)
 {
 	dlm_lockspace_t *lockspace;

@@ -508,6 +528,14 @@
 		error = device_remove_lockspace(&kbuf->i.lspace);
 		break;
 
+	case DLM_USER_PURGE:
+		if (!proc) {
+			log_print("no locking on control device");
+			goto out_sig;
+		}
+		error = device_user_purge(proc, &kbuf->i.purge);
+		break;
+
 	default:
 		log_print("Unknown command passed to DLM device : %d\n",
 			  kbuf->cmd);

Index: linux-2.6.21-rc5-quilt/include/linux/dlm_device.h
===================================================================

include/linux/dlm_device.h +8 -1

@@ -19,7 +19,7 @@
 
 /* Version of the device interface */
 #define DLM_DEVICE_VERSION_MAJOR 5
-#define DLM_DEVICE_VERSION_MINOR 0
+#define DLM_DEVICE_VERSION_MINOR 1
 #define DLM_DEVICE_VERSION_PATCH 0
 
 /* struct passed to the lock write */

@@ -44,6 +44,11 @@
 	char name[0];
 };
 
+struct dlm_purge_params {
+	__u32 nodeid;
+	__u32 pid;
+};
+
 struct dlm_write_request {
 	__u32 version[3];
 	__u8 cmd;

@@ -53,6 +58,7 @@
 	union  {
 		struct dlm_lock_params   lock;
 		struct dlm_lspace_params lspace;
+		struct dlm_purge_params  purge;
 	} i;
 };
 

@@ -76,6 +82,7 @@
 #define DLM_USER_QUERY        3
 #define DLM_USER_CREATE_LOCKSPACE  4
 #define DLM_USER_REMOVE_LOCKSPACE  5
+#define DLM_USER_PURGE        6
 
 /* Arbitrary length restriction */
 #define MAX_LS_NAME_LEN 64