• Christoph Hellwig's avatar
    fs: split generic and aio kiocb · 04b2fa9f
    Christoph Hellwig authored
    
    
    Most callers in the kernel want to perform synchronous file I/O, but
    still have to bloat the stack with a full struct kiocb.  Split out
    the parts needed in filesystem code from those in the aio code, and
    only allocate those needed to pass down argument on the stack.  The
    aio code embedds the generic iocb in the one it allocates and can
    easily get back to it by using container_of.
    
    Also add a ->ki_complete method to struct kiocb, this is used to call
    into the aio code and thus removes the dependency on aio for filesystems
    impementing asynchronous operations.  It will also allow other callers
    to substitute their own completion callback.
    
    We also add a new ->ki_flags field to work around the nasty layering
    violation recently introduced in commit 5e33f6 ("usb: gadget: ffs: add
    eventfd notification about ffs events").
    Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
    Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
    04b2fa9f