Orangefs: code sanitation.

Signed-off-by: Mike Marshall <hubcap@omnibond.com>

fs/orangefs/devorangefs-req.c

@@ -46,6 +46,10 @@ static void orangefs_devreq_add_op(struct orangefs_kernel_op_s *op)
 	list_add_tail(&op->list, &htable_ops_in_progress[index]);
 }
 
+/*
+ * find the op with this tag and remove it from the in progress
+ * hash table.
+ */
 static struct orangefs_kernel_op_s *orangefs_devreq_remove_op(__u64 tag)
 {
 	struct orangefs_kernel_op_s *op, *next;
@@ -190,8 +194,10 @@ restart:
 		return -EAGAIN;
 	}
 
-	gossip_debug(GOSSIP_DEV_DEBUG, "orangefs: reading op tag %llu %s\n",
-		     llu(cur_op->tag), get_opname_string(cur_op));
+	gossip_debug(GOSSIP_DEV_DEBUG, "%s: reading op tag %llu %s\n",
+		     __func__,
+		     llu(cur_op->tag),
+		     get_opname_string(cur_op));
 
 	/*
 	 * Such an op should never be on the list in the first place. If so, we
@@ -204,6 +210,7 @@ restart:
 		spin_unlock(&orangefs_request_list_lock);
 		return -EAGAIN;
 	}
+
 	list_del_init(&cur_op->list);
 	spin_unlock(&orangefs_request_list_lock);
 
@@ -323,6 +330,7 @@ static ssize_t orangefs_devreq_write_iter(struct kiocb *iocb,
 		return -EPROTO;
 	}
 
+	/* remove the op from the in progress hash table */
 	op = orangefs_devreq_remove_op(head.tag);
 	if (!op) {
 		gossip_err("WARNING: No one's waiting for tag %llu\n",
@@ -486,15 +494,7 @@ static int orangefs_devreq_release(struct inode *inode, struct file *file)
 	gossip_debug(GOSSIP_DEV_DEBUG, "ORANGEFS Device Close: Filesystem(s) %s\n",
 		     (unmounted ? "UNMOUNTED" : "MOUNTED"));
 
-	/*
-	 * Walk through the list of ops in the request list, mark them
-	 * as purged and wake them up.
-	 */
 	purge_waiting_ops();
-	/*
-	 * Walk through the hash table of in progress operations; mark
-	 * them as purged and wake them up
-	 */
 	purge_inprogress_ops();
 
 	orangefs_bufmap_run_down();

fs/orangefs/orangefs-mod.c

@@ -119,10 +119,10 @@ static int __init orangefs_init(void)
 	if (gossip_debug_mask != 0)
 		kernel_mask_set_mod_init = true;
 
-	/* print information message to the system log */
-	pr_info("orangefs: orangefs_init called with debug mask: :%s: :%llx:\n",
-	       kernel_debug_string,
-	       (unsigned long long)gossip_debug_mask);
+	pr_info("%s: called with debug mask: :%s: :%llx:\n",
+		__func__,
+		kernel_debug_string,
+		(unsigned long long)gossip_debug_mask);
 
 	ret = bdi_init(&orangefs_backing_dev_info);
 
@@ -147,7 +147,8 @@ static int __init orangefs_init(void)
 	/* Initialize the orangefsdev subsystem. */
 	ret = orangefs_dev_init();
 	if (ret < 0) {
-		gossip_err("orangefs: could not initialize device subsystem %d!\n",
+		gossip_err("%s: could not initialize device subsystem %d!\n",
+			   __func__,
 			   ret);
 		goto cleanup_inode;
 	}

fs/orangefs/waitqueue.c

@@ -75,7 +75,7 @@ retry_servicing:
 
 	/*
 	 * If ORANGEFS_OP_NO_MUTEX was set in flags, we need to avoid
-	 * aquiring the request_mutex because we're servicing a
+	 * acquiring the request_mutex because we're servicing a
 	 * high priority remount operation and the request_mutex is
 	 * already taken.
 	 */
@@ -91,7 +91,8 @@ retry_servicing:
 		if (ret < 0) {
 			op->downcall.status = ret;
 			gossip_debug(GOSSIP_WAIT_DEBUG,
-				     "orangefs: service_operation interrupted.\n");
+				     "%s: service_operation interrupted.\n",
+				     __func__);
 			return ret;
 		}
 	}
@@ -127,9 +128,9 @@ retry_servicing:
 		     ret,
 		     op);
 
+	/* got matching downcall; make sure status is in errno format */
 	if (!ret) {
 		spin_unlock(&op->lock);
-		/* got matching downcall; make sure status is in errno format */
 		op->downcall.status =
 		    orangefs_normalize_to_errno(op->downcall.status);
 		ret = op->downcall.status;
@@ -144,8 +145,8 @@ retry_servicing:
 	}
 
 	/*
-	 * remove waiting ops from the request list or
-	 * remove in-progress ops from the in-progress list.
+	 * remove a waiting op from the request list or
+	 * remove an in-progress op from the in-progress list.
 	 */
 	orangefs_clean_up_interrupted_operation(op);
 
@@ -179,6 +180,7 @@ out:
 	return ret;
 }
 
+/* This can get called on an I/O op if it had a bad service_operation. */
 bool orangefs_cancel_op_in_progress(struct orangefs_kernel_op_s *op)
 {
 	u64 tag = op->tag;
@@ -206,23 +208,31 @@ bool orangefs_cancel_op_in_progress(struct orangefs_kernel_op_s *op)
 	spin_unlock(&op->lock);
 	spin_unlock(&orangefs_request_list_lock);
 
-	gossip_debug(GOSSIP_UTILS_DEBUG,
+	gossip_debug(GOSSIP_WAIT_DEBUG,
 		     "Attempting ORANGEFS operation cancellation of tag %llu\n",
 		     llu(tag));
 	return true;
 }
 
-static void orangefs_clean_up_interrupted_operation(struct orangefs_kernel_op_s *op)
+/*
+ * Change an op to the "given up" state and remove it from its list.
+ */
+static void
+	orangefs_clean_up_interrupted_operation(struct orangefs_kernel_op_s *op)
 {
 	/*
 	 * handle interrupted cases depending on what state we were in when
-	 * the interruption is detected.  there is a coarse grained lock
-	 * across the operation.
+	 * the interruption is detected.
 	 *
 	 * Called with op->lock held.
 	 */
+
+	/*
+	 * List manipulation code elsewhere will ignore ops that
+	 * have been given up upon.
+	 */
 	op->op_state |= OP_VFS_STATE_GIVEN_UP;
-	/* from that point on it can't be moved by anybody else */
+
 	if (list_empty(&op->list)) {
 		/* caught copying to/from daemon */
 		BUG_ON(op_state_serviced(op));
@@ -259,12 +269,12 @@ static void orangefs_clean_up_interrupted_operation(struct orangefs_kernel_op_s
 }
 
 /*
- * sleeps on waitqueue waiting for matching downcall.
- * if client-core finishes servicing, then we are good to go.
+ * Sleeps on waitqueue waiting for matching downcall.
+ * If client-core finishes servicing, then we are good to go.
  * else if client-core exits, we get woken up here, and retry with a timeout
  *
- * Post when this call returns to the caller, the specified op will no
- * longer be on any list or htable.
+ * When this call returns to the caller, the specified op will no
+ * longer be in either the in_progress hash table or on the request list.
  *
  * Returns 0 on success and -errno on failure
  * Errors are:
@@ -281,6 +291,12 @@ static int wait_for_matching_downcall(struct orangefs_kernel_op_s *op,
 {
 	long n;
 
+	/*
+	 * There's a "schedule_timeout" inside of these wait
+	 * primitives, during which the op is out of the hands of the
+	 * user process that needs something done and is being
+	 * manipulated by the client-core process.
+	 */
 	if (interruptible)
 		n = wait_for_completion_interruptible_timeout(&op->waitq,
 							      timeout);