From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Thu, 23 Jun 2011 19:40:58 +0000 (-0400)
Subject: Add ring buffer flush ioctl
X-Git-Tag: v2.0-pre1~48
X-Git-Url: https://git.liburcu.org/?a=commitdiff_plain;h=5c0552665e4d152e97edc995650711d4f6ac418d;p=lttng-modules.git

Add ring buffer flush ioctl

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/lib/ringbuffer/ring_buffer_vfs.c b/lib/ringbuffer/ring_buffer_vfs.c
index 9786d353..60d69a92 100644
--- a/lib/ringbuffer/ring_buffer_vfs.c
+++ b/lib/ringbuffer/ring_buffer_vfs.c
@@ -245,6 +245,9 @@ long lib_ring_buffer_ioctl(struct file *filp, unsigned int cmd, unsigned long ar
 		return put_ulong(buf->backend.array[sb_bindex]->mmap_offset,
 				 arg);
 	}
+	case RING_BUFFER_FLUSH:
+		lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE);
+		return 0;
 	default:
 		return -ENOIOCTLCMD;
 	}
@@ -355,6 +358,9 @@ long lib_ring_buffer_compat_ioctl(struct file *filp, unsigned int cmd,
 			return -EINVAL;
 		return put_ulong(read_offset, arg);
 	}
+	case RING_BUFFER_FLUSH:
+		lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE);
+		return 0;
 	default:
 		return -ENOIOCTLCMD;
 	}
diff --git a/lib/ringbuffer/vfs.h b/lib/ringbuffer/vfs.h
index 0a09637a..d073e4c5 100644
--- a/lib/ringbuffer/vfs.h
+++ b/lib/ringbuffer/vfs.h
@@ -83,5 +83,7 @@ long lib_ring_buffer_compat_ioctl(struct file *filp, unsigned int cmd,
 #define RING_BUFFER_GET_MMAP_LEN		_IOR(0xF6, 0x0A, unsigned long)
 /* returns the offset of the subbuffer belonging to the mmap reader. */
 #define RING_BUFFER_GET_MMAP_READ_OFFSET	_IOR(0xF6, 0x0B, unsigned long)
+/* flush the current sub-buffer */
+#define RING_BUFFER_FLUSH			_IO(0xF6, 0x0C)
 
 #endif /* _LINUX_RING_BUFFER_VFS_H */