• David Howells's avatar
    CRED: Introduce credential access wrappers · 9e2b2dc4
    David Howells authored
    The patches that are intended to introduce copy-on-write credentials for 2.6.28
    require abstraction of access to some fields of the task structure,
    particularly for the case of one task accessing another's credentials where RCU
    will have to be observed.
    
    Introduced here are trivial no-op versions of the desired accessors for current
    and other tasks so that other subsystems can start to be converted over more
    easily.
    
    Wrappers are introduced into a new header (linux/cred.h) for UID/GID,
    EUID/EGID, SUID/SGID, FSUID/FSGID, cap_effective and current's subscribed
    user_struct.  These wrappers are macros because the ordering between header
    files mitigates against making them inline functions.
    
    linux/cred.h is #included from linux/sched.h.
    
    Further, XFS is modified such that it no longer defines and uses parameterised
    versions of current_fs[ug]id(), thus getting rid of the namespace collision
    otherwise incurred.
    Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
    Signed-off-by: default avatarJames Morris <jmorris@namei.org>
    9e2b2dc4
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