On Fri, Apr 14, 2017 at 07:02:50AM -0500, Goldwyn Rodrigues wrote:
> From: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
>
> RWF_* flags is used for preadv2/pwritev2 calls. Port to use
> it for aio operations as well. For this, aio_rw_flags is
> introduced in struct iocb (using aio_reserved1) which will
> carry these flags.
>
> This is a precursor to the nowait AIO calls.
>
> Note, the only place RWF_HIPRI comes in effect is dio_await_one().
> All the rest of the locations, aio code return -EIOCBQUEUED before the
> checks for RWF_HIPRI.
>
> Signed-off-by: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
> ---
> fs/aio.c | 10 +++++++++-
> fs/read_write.c | 7 +------
> include/linux/fs.h | 12 ++++++++++++
> include/uapi/linux/aio_abi.h | 2 +-
> 4 files changed, 23 insertions(+), 8 deletions(-)
>
> diff --git a/fs/aio.c b/fs/aio.c
> index f52d925ee259..b8a33f5beef5 100644
> --- a/fs/aio.c
> +++ b/fs/aio.c
> @@ -1541,11 +1541,17 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
> ssize_t ret;
>
> /* enforce forwards compatibility on users */
> - if (unlikely(iocb->aio_reserved1 || iocb->aio_reserved2)) {
> + if (unlikely(iocb->aio_reserved2)) {
> pr_debug("EINVAL: reserve field set\n");
> return -EINVAL;
> }
>
> + if (unlikely(iocb->aio_rw_flags & ~(RWF_HIPRI | RWF_DSYNC | RWF_SYNC))) {
> + pr_debug("EINVAL: aio_rw_flags set with incompatible flags\n");
> + return -EINVAL;
> + }
> +
> + req->common.ki_flags |= iocb_rw_flags(iocb->aio_rw_flags);
The flag validity checking also needs to go into what's currently
iocb_rw_flags (which will need a new name and a return value).
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