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-rw-r--r--include/linux/relayfs_fs.h8
1 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/relayfs_fs.h b/include/linux/relayfs_fs.h
index 8c2177105857..30f45511b40d 100644
--- a/include/linux/relayfs_fs.h
+++ b/include/linux/relayfs_fs.h
@@ -116,6 +116,7 @@ struct rchan_callbacks
* @parent: the parent of the file to create
* @mode: the mode of the file to create
* @buf: the channel buffer
+ * @is_global: outparam - set non-zero if the buffer should be global
*
* Called during relay_open(), once for each per-cpu buffer,
* to allow the client to create a file to be used to
@@ -126,12 +127,17 @@ struct rchan_callbacks
* The callback should return the dentry of the file created
* to represent the relay buffer.
*
+ * Setting the is_global outparam to a non-zero value will
+ * cause relay_open() to create a single global buffer rather
+ * than the default set of per-cpu buffers.
+ *
* See Documentation/filesystems/relayfs.txt for more info.
*/
struct dentry *(*create_buf_file)(const char *filename,
struct dentry *parent,
int mode,
- struct rchan_buf *buf);
+ struct rchan_buf *buf,
+ int *is_global);
/*
* remove_buf_file - remove file representing a relayfs channel buffer