refcounting improvements in sysfs.

This series tidies up the refcount of sysfs_dirents in sysfs,
using kref where appropriate and a new karef for s_active.
This achieves significant code simplification, especially the first
patch.

This is in part inspired by http://lwn.net/Articles/336224/ :-)

NeilBrown

---

NeilBrown (3):
      sysfs: simplify handling for s_active refcount
      sysfs: make s_count a kref
      kref: create karef and use for sysfs_dirent->s_active


 fs/sysfs/dir.c       |   74 ++++++++++++++++++++------------------------------
 fs/sysfs/mount.c     |    3 +-
 fs/sysfs/sysfs.h     |   19 +++++--------
 include/linux/kref.h |   38 ++++++++++++++++++++++++++
 lib/kref.c           |   13 +++++++++
 5 files changed, 90 insertions(+), 57 deletions(-)

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