Fix: Implement RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK

[lttng-modules.git] / lib / ringbuffer / vfs.h

diff --git a/lib/ringbuffer/vfs.h b/lib/ringbuffer/vfs.h
index b30b0f5814553f84915ab20a1982e062d5a20cc7..44a8bc24a0b867f1365b74bdd83521b83c1fe934 100644 (file)
--- a/lib/ringbuffer/vfs.h
+++ b/lib/ringbuffer/vfs.h
@@ -112,6 +112,12 @@ ssize_t vfs_lib_ring_buffer_splice_read(struct file *in, loff_t *ppos,
  * so it can be read again.
  */
 #define RING_BUFFER_METADATA_CACHE_DUMP                _IO(0xF6, 0x10)
+/*
+ * Get next metadata subbuffer, returning a flag indicating whether the
+ * metadata is guaranteed to be in a consistent state at the end of this
+ * sub-buffer (can be parsed).
+ */
+#define RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK     _IOR(0xF6, 0x12, uint32_t)
 
 #ifdef CONFIG_COMPAT
 /* Get a snapshot of the current ring buffer producer and consumer positions */
@@ -156,6 +162,13 @@ ssize_t vfs_lib_ring_buffer_splice_read(struct file *in, loff_t *ppos,
 /* Flush the current sub-buffer, even if empty. */
 #define RING_BUFFER_COMPAT_FLUSH_EMPTY                 \
        RING_BUFFER_FLUSH_EMPTY
+/*
+ * Get next metadata subbuffer, returning a flag indicating whether the
+ * metadata is guaranteed to be in a consistent state at the end of this
+ * sub-buffer (can be parsed).
+ */
+#define RING_BUFFER_COMPAT_GET_NEXT_SUBBUF_METADATA_CHECK \
+       RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK
 #endif /* CONFIG_COMPAT */
 
 #endif /* _LIB_RING_BUFFER_VFS_H */