[PATCH] relayfs: add Documention for non-relay files
Documentation update for non-relay files.
Signed-off-by: Tom Zanussi <zanussi@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/Documentation/filesystems/relayfs.txt b/Documentation/filesystems/relayfs.txt
index d803abe..0720a04 100644
--- a/Documentation/filesystems/relayfs.txt
+++ b/Documentation/filesystems/relayfs.txt
@@ -125,6 +125,8 @@
relay_reset(chan)
relayfs_create_dir(name, parent)
relayfs_remove_dir(dentry)
+ relayfs_create_file(name, parent, mode, fops, data)
+ relayfs_remove_file(dentry)
channel management typically called on instigation of userspace:
@@ -320,6 +322,27 @@
to finalize and process the last sub-buffers before the channel is
closed.
+Creating non-relay files
+------------------------
+
+relay_open() automatically creates files in the relayfs filesystem to
+represent the per-cpu kernel buffers; it's often useful for
+applications to be able to create their own files alongside the relay
+files in the relayfs filesystem as well e.g. 'control' files much like
+those created in /proc or debugfs for similar purposes, used to
+communicate control information between the kernel and user sides of a
+relayfs application. For this purpose the relayfs_create_file() and
+relayfs_remove_file() API functions exist. For relayfs_create_file(),
+the caller passes in a set of user-defined file operations to be used
+for the file and an optional void * to a user-specified data item,
+which will be accessible via inode->u.generic_ip (see the relay-apps
+tarball for examples). The file_operations are a required parameter
+to relayfs_create_file() and thus the semantics of these files are
+completely defined by the caller.
+
+See the relay-apps tarball at http://relayfs.sourceforge.net for
+examples of how these non-relay files are meant to be used.
+
Misc
----