sysfs: use rb-tree for name lookups

sysfs: use rb-tree for name lookups

Use red-black tree for name lookups.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 5 insertions, 0 deletions

diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index 6348e2c753f..fe1a9e8650b 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -11,6 +11,7 @@
 #include <linux/lockdep.h>
 #include <linux/kobject_ns.h>
 #include <linux/fs.h>
+#include <linux/rbtree.h>
 
 struct sysfs_open_dirent;
 
@@ -21,6 +22,8 @@ struct sysfs_elem_dir {
 	struct sysfs_dirent	*children;
 
 	unsigned long		subdirs;
+
+	struct rb_root		name_tree;
 };
 
 struct sysfs_elem_symlink {
@@ -61,6 +64,8 @@ struct sysfs_dirent {
 	struct sysfs_dirent	*s_sibling;
 	const char		*s_name;
 
+	struct rb_node		name_node;
+
 	const void		*s_ns; /* namespace tag */
 	union {
 		struct sysfs_elem_dir		s_dir;