[PATCHSET] Sysfs cleanups from Eric W. Biederman

[Tejun Heo <htejun@gmail.com>]

Hello, all.

This is subset of Eric W. Biederman's "Sysfs cleanups & tagged
directory support" patchset[1] with the following modifications.

* fix-i_mutex-locking-in-sysfs_get_dentry patch is added at the top
  and #14-Don_t-use-lookup_one_len_kern and
  #15-vfs-Remove-lookup_one_len_kern are dropped.  This is because #14
  contained had a bug where it might created dentry/inode for an
  already deleted sysfs_dirent.  I think it's benefitial to keep
  single lookup path.

* Rewrote simplify-sysfs_get_dentry patch and
  #08-Implement-__sysfs_get_dentry,
  #09-Move-sysfs_get_dentry-below-__sysfs_get_dentry and
  #10-Rewrite-sysfs_get_dentry-in-terms-of-__sysfs_get_dentry are
  omitted as __sysfs_get_dentry() isn't used by anyone.

* #16, 19-25 are omitted as it isn't clear yet how the tagged entry
  support will end up.

* readdir simplification fixed.

* sysfs_mutex double locking fixed.

The patchset is on top of the current -gregkh.

Thanks.

--
tejun

[1] http://thread.gmane.org/gmane.linux.kernel/564287/focus=519


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