On Wed, Mar 21, 2018 at 08:32:26AM +0100, Christoph Hellwig wrote:
> Don't reference the kiocb structure from the common aio code, and move
> any use of it into helper specific to the read/write path. This is in
> preparation for aio_poll support that wants to use the space for different
> fields.
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> Acked-by: Jeff Moyer <jmoyer@xxxxxxxxxx>
> Reviewed-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> ---
> fs/aio.c | 171 ++++++++++++++++++++++++++++++++++++---------------------------
> 1 file changed, 97 insertions(+), 74 deletions(-)
>
> diff --git a/fs/aio.c b/fs/aio.c
> index 41fc8ce6bc7f..6295fc00f104 100644
> --- a/fs/aio.c
> +++ b/fs/aio.c
> @@ -170,7 +170,9 @@ struct kioctx {
> #define KIOCB_CANCELLED ((void *) (~0ULL))
>
> struct aio_kiocb {
> - struct kiocb common;
> + union {
> + struct kiocb rw;
> + };
>
> struct kioctx *ki_ctx;
> kiocb_cancel_fn *ki_cancel;
> @@ -549,7 +551,7 @@ static int aio_setup_ring(struct kioctx *ctx, unsigned int nr_events)
>
> void kiocb_set_cancel_fn(struct kiocb *iocb, kiocb_cancel_fn *cancel)
> {
> - struct aio_kiocb *req = container_of(iocb, struct aio_kiocb, common);
> + struct aio_kiocb *req = container_of(iocb, struct aio_kiocb, rw);
> struct kioctx *ctx = req->ki_ctx;
> unsigned long flags;
>
> @@ -582,7 +584,7 @@ static int kiocb_cancel(struct aio_kiocb *kiocb)
> cancel = cmpxchg(&kiocb->ki_cancel, old, KIOCB_CANCELLED);
> } while (cancel != old);
>
> - return cancel(&kiocb->common);
> + return cancel(&kiocb->rw);
> }
>
> static void free_ioctx(struct work_struct *work)
> @@ -1040,15 +1042,6 @@ static inline struct aio_kiocb *aio_get_req(struct kioctx *ctx)
> return NULL;
> }
>
> -static void kiocb_free(struct aio_kiocb *req)
> -{
> - if (req->common.ki_filp)
> - fput(req->common.ki_filp);
> - if (req->ki_eventfd != NULL)
> - eventfd_ctx_put(req->ki_eventfd);
> - kmem_cache_free(kiocb_cachep, req);
> -}
> -
> static struct kioctx *lookup_ioctx(unsigned long ctx_id)
> {
> struct aio_ring __user *ring = (void __user *)ctx_id;
> @@ -1079,29 +1072,14 @@ static struct kioctx *lookup_ioctx(unsigned long ctx_id)
> /* aio_complete
> * Called when the io request on the given iocb is complete.
> */
> -static void aio_complete(struct kiocb *kiocb, long res, long res2)
> +static void aio_complete(struct aio_kiocb *iocb, long res, long res2)
> {
> - struct aio_kiocb *iocb = container_of(kiocb, struct aio_kiocb, common);
> struct kioctx *ctx = iocb->ki_ctx;
> struct aio_ring *ring;
> struct io_event *ev_page, *event;
> unsigned tail, pos, head;
> unsigned long flags;
>
> - BUG_ON(is_sync_kiocb(kiocb));
Ah, nevermind about my previous email, sorry, should have kept
reading...
> +static void aio_complete_rw(struct kiocb *kiocb, long res, long res2)
> +{
> + struct aio_kiocb *iocb = container_of(kiocb, struct aio_kiocb, rw);
> +
> + WARN_ON_ONCE(is_sync_kiocb(kiocb));
That's nicer, thanks.
Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
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