sysfs: make directory dentries and inodes reclaimable

This patch makes dentries and inodes for sysfs directories
reclaimable.

* sysfs_notify() is modified to walk sysfs_dirent tree instead of
  dentry tree.

* sysfs_update_file() and sysfs_chmod_file() use sysfs_get_dentry() to
  grab the victim dentry.

* sysfs_rename_dir() and sysfs_move_dir() grab all dentries using
  sysfs_get_dentry() on startup.

* Dentries for all shadowed directories are pinned in memory to serve
  as lookup start point.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 0 insertions, 1 deletions

diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index 4c43030fae5d..2f58ca1af770 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -81,7 +81,6 @@ struct sysfs_ops {
 #define SYSFS_KOBJ_ATTR         0x0004
 #define SYSFS_KOBJ_BIN_ATTR     0x0008
 #define SYSFS_KOBJ_LINK         0x0020
-#define SYSFS_NOT_PINNED        (SYSFS_KOBJ_ATTR | SYSFS_KOBJ_BIN_ATTR | SYSFS_KOBJ_LINK)
 #define SYSFS_COPY_NAME         (SYSFS_DIR | SYSFS_KOBJ_LINK)
 
 #define SYSFS_FLAG_MASK         ~SYSFS_TYPE_MASK