[DLM] interface for purge (2/2)

Add code to accept purge commands from userland.

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

3 files changed, 38 insertions, 1 deletions

diff --git a/fs/dlm/lock.h b/fs/dlm/lock.h
index 0843a3073ec3..64fc4ec40668 100644
--- a/fs/dlm/lock.h
+++ b/fs/dlm/lock.h
@@ -41,6 +41,8 @@ int dlm_user_unlock(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
         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)
diff --git a/fs/dlm/user.c b/fs/dlm/user.c
index c978c67b1eff..3e746a6ebac3 100644
--- a/fs/dlm/user.c
+++ b/fs/dlm/user.c
@@ -56,6 +56,7 @@ struct dlm_write_request32 {
         union  {
                 struct dlm_lock_params32 lock;
                 struct dlm_lspace_params lspace;
+                struct dlm_purge_params purge;
         } i;
 };
 
@@ -92,6 +93,9 @@ static void compat_input(struct dlm_write_request *kb,
                 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;
@@ -320,6 +324,22 @@ fail:
         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;
@@ -522,6 +542,14 @@ static ssize_t device_write(struct file *file, const char __user *buf,
                 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);
diff --git a/include/linux/dlm_device.h b/include/linux/dlm_device.h
index 2a2dd189b9fd..c2735cab2ebf 100644
--- a/include/linux/dlm_device.h
+++ b/include/linux/dlm_device.h
@@ -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 @@ struct dlm_lspace_params {
         char name[0];
 };
 
+struct dlm_purge_params {
+        __u32 nodeid;
+        __u32 pid;
+};
+
 struct dlm_write_request {
         __u32 version[3];
         __u8 cmd;
@@ -53,6 +58,7 @@ struct dlm_write_request {
         union  {
                 struct dlm_lock_params   lock;
                 struct dlm_lspace_params lspace;
+                struct dlm_purge_params  purge;
         } i;
 };
 
@@ -76,6 +82,7 @@ struct dlm_lock_result {
 #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