eventfs: Implement eventfs dir creation functions

Add eventfs_file structure which will hold the properties of the eventfs
files and directories.

Add following functions to create the directories in eventfs:

eventfs_create_events_dir() will create the top level "events" directory
within the tracefs file system.

eventfs_add_subsystem_dir() creates an eventfs_file descriptor with the
given name of the subsystem.

eventfs_add_dir() creates an eventfs_file descriptor with the given name of
the directory and attached to a eventfs_file of a subsystem.

Add tracefs_inode structure to hold the inodes, flags and pointers to
private data used by eventfs.

Link: https://lkml.kernel.org/r/1690568452-46553-5-git-send-email-akaher@vmware.com

Signed-off-by: Ajay Kaher <akaher@vmware.com>
Co-developed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Tested-by: Ching-lin Yu <chinglinyu@google.com>
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202305051619.9a469a9a-yujie.liu@intel.com
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/fs/tracefs/internal.h b/fs/tracefs/internal.h
index 7dfb7ebc1c3f..f0fd565d59ec 100644
--- a/fs/tracefs/internal.h
+++ b/fs/tracefs/internal.h
@@ -2,6 +2,10 @@
 #ifndef _TRACEFS_INTERNAL_H
 #define _TRACEFS_INTERNAL_H
 
+enum {
+	TRACEFS_EVENT_INODE     = BIT(1),
+};
+
 struct tracefs_inode {
 	unsigned long           flags;
 	void                    *private;