[PATCH] XATTR issues on JFFS2

[KaiGai Kohei]

Hi,

This attached patches are enables XATTR support on JFFS2.
some new functionalities are added from take-3 patches.

# Sorry for slowing update.

[NOTICE]
     We can test this patch with ONLY 2.6.14 kernel.
     The previous versions of kernel do not support an new LSM hook.

[1/2] jffs2_xattr_take-4.patch
   * CONFIG_JFFS2_XATTR was renamed to CONFIG_JFFS2_FS_XATTR
     The XATTR configuration switch are named CONFIG_<fsname>_FS_XATTR
     on another some filesystems which support XATTR.
     I also follow this manner.

   * CONFIG_JFFS2_FS_POSIX_ACL and JFFS2_FS_SECURITY are selectable.
     this follows another FS's manner.

   * POSIX-ACL support was added.
     This functionality is implemented in acl.c, acl.h.
     I implemented the most part of this functionalities by referring
     the Ext2/3's implementation of POSIX-ACL.
     If I took bad manner or misunderstanding for implementation,
     notice me please.

   * jffs2_init_security() was added for inode initialization.
     At 2.6.14, new LSM hook(security_inode_init_security) was added.
     Because of this, any filesystems obtain security attribtues must
     call this this hook to set the security label for new inode.
     It's deployed in jffs2_create(), jffs2_symlink(), jffs2_mkdir()
     and jffs2_mknod().

   * Some patch conflicts were fixed.
     We can apply this patches for latest MTD-CVS without incident.

   * An obvious bug was fixed.
     In jffs2_build_xattr_subsystem(), NULL checking was omitted.

[2/2] mkfs.jffs2-xattr.patch
   * --with-{xattr|selinux|posix-acl} options are added.
     --with-xattr enables to pack all xattr-entries into jffs2 image file.
     --with-selinux enables to pack security related xattr-entries which
       are named as 'security.*' into jffs2 image file.
     --with-posix-acl enables to pack ACL related xattr-entries which
       are names as 'system.posix_acl_access' or 'system.posix_acl_default'.

I hope to merge those functionalities into MTD's CVS tree.
Thanks,
-- 
KaiGai Kohei <kaigai at ak.jp.nec.com>
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