• Vadim Lobanov's avatar
    [PATCH] fdtable: Remove the free_files field · 4fd45812
    Vadim Lobanov authored
    An fdtable can either be embedded inside a files_struct or standalone (after
    being expanded).  When an fdtable is being discarded after all RCU references
    to it have expired, we must either free it directly, in the standalone case,
    or free the files_struct it is contained within, in the embedded case.
    Currently the free_files field controls this behavior, but we can get rid of
    it entirely, as all the necessary information is already recorded.  We can
    distinguish embedded and standalone fdtables using max_fds, and if it is
    embedded we can divine the relevant files_struct using container_of().
    Signed-off-by: default avatarVadim Lobanov <vlobanov@speakeasy.net>
    Cc: Christoph Hellwig <hch@lst.de>
    Cc: Al Viro <viro@zeniv.linux.org.uk>
    Cc: Dipankar Sarma <dipankar@in.ibm.com>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
fork.c 42.2 KB