ocfs2: Remove EXIT from masklog.

mlog_exit is used to record the exit status of a function.
But because it is added in so many functions, if we enable it,
the system logs get filled up quickly and cause too much I/O.
So actually no one can open it for a production system or even
for a test.

This patch just try to remove it or change it. So:
1. if all the error paths already use mlog_errno, it is just removed.
   Otherwise, it will be replaced by mlog_errno.
2. if it is used to print some return value, it is replaced with
   mlog(0,...).
mlog_exit_ptr is changed to mlog(0.
All those mlog(0,...) will be replaced with trace events later.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 71375d7..1e1a93a 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -135,7 +135,6 @@
 	}
 
 leave:
-	mlog_exit(status);
 	return status;
 }
 
@@ -154,8 +153,6 @@
 
 	ocfs2_free_file_private(inode, file);
 
-	mlog_exit(0);
-
 	return 0;
 }
 
@@ -195,7 +192,8 @@
 	err = jbd2_journal_force_commit(journal);
 
 bail:
-	mlog_exit(err);
+	if (err)
+		mlog_errno(err);
 
 	return (err < 0) ? -EIO : 0;
 }
@@ -278,7 +276,6 @@
 out_commit:
 	ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 out:
-	mlog_exit(ret);
 	return ret;
 }
 
@@ -300,7 +297,6 @@
 	}
 
 bail:
-	mlog_exit(status);
 	return status;
 }
 
@@ -424,8 +420,6 @@
 out_commit:
 	ocfs2_commit_trans(osb, handle);
 out:
-
-	mlog_exit(status);
 	return status;
 }
 
@@ -520,7 +514,6 @@
 	if (!status && OCFS2_I(inode)->ip_clusters == 0)
 		status = ocfs2_try_remove_refcount_tree(inode, di_bh);
 
-	mlog_exit(status);
 	return status;
 }
 
@@ -713,7 +706,6 @@
 	brelse(bh);
 	bh = NULL;
 
-	mlog_exit(status);
 	return status;
 }
 
@@ -1269,7 +1261,6 @@
 			mlog_errno(status);
 	}
 
-	mlog_exit(status);
 	return status;
 }
 
@@ -1295,8 +1286,6 @@
 	stat->blksize = osb->s_clustersize;
 
 bail:
-	mlog_exit(err);
-
 	return err;
 }
 
@@ -1318,7 +1307,6 @@
 
 	ocfs2_inode_unlock(inode, 0);
 out:
-	mlog_exit(ret);
 	return ret;
 }
 
@@ -1359,7 +1347,6 @@
 out_trans:
 	ocfs2_commit_trans(osb, handle);
 out:
-	mlog_exit(ret);
 	return ret;
 }
 
@@ -2393,7 +2380,6 @@
 
 	if (written)
 		ret = written;
-	mlog_exit(ret);
 	return ret;
 }
 
@@ -2476,7 +2462,6 @@
 		balance_dirty_pages_ratelimited_nr(mapping, nr_pages);
 	}
 
-	mlog_exit(ret);
 	return ret;
 }
 
@@ -2507,7 +2492,6 @@
 	ret = generic_file_splice_read(in, ppos, pipe, len, flags);
 
 bail:
-	mlog_exit(ret);
 	return ret;
 }
 
@@ -2588,7 +2572,6 @@
 	}
 	if (rw_level != -1)
 		ocfs2_rw_unlock(inode, rw_level);
-	mlog_exit(ret);
 
 	return ret;
 }