Re: [PATCH 26/32] aio: refactor read/write iocb setup

Christoph Hellwig [off-list ref] writes:

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@lst.de>

I think this all looks okay (making sure everything was still cleaned up
in the error cases was a bit of a chore).  One nit below.

+static int aio_prep_rw(struct kiocb *req, struct iocb *iocb)
+{
+	int ret;
+
+	req->ki_filp = fget(iocb->aio_fildes);
+	if (unlikely(!req->ki_filp))
+		return -EBADF;
+	req->ki_complete = aio_complete_rw;
+	req->ki_flags = 0;

The above assignment seems superfluous...

+	req->ki_pos = iocb->aio_offset;
+	req->ki_flags = iocb_flags(req->ki_filp);

because of this.

Acked-by: Jeff Moyer <redacted>

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On Wed, Jan 10, 2018 at 04:19:53PM -0500, Jeff Moyer wrote:

quoted

+static int aio_prep_rw(struct kiocb *req, struct iocb *iocb)
+{
+	int ret;
+
+	req->ki_filp = fget(iocb->aio_fildes);
+	if (unlikely(!req->ki_filp))
+		return -EBADF;
+	req->ki_complete = aio_complete_rw;
+	req->ki_flags = 0;

The above assignment seems superfluous...

Thanks, fixed.

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