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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.0 MIME-Version: 1.0 In-Reply-To: <1595605762-17010-7-git-send-email-joshi.k@samsung.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 24/07/2020 18:49, Kanchan Joshi wrote: > From: SelvaKumar S > > Repurpose [cqe->res, cqe->flags] into cqe->res64 (signed) to report > 64bit written-offset for zone-append. The appending-write which requires > reporting written-location (conveyed by IOCB_ZONE_APPEND flag) is > ensured not to be a short-write; this avoids the need to report > number-of-bytes-copied. > append-offset is returned by lower-layer to io-uring via ret2 of > ki_complete interface. Make changes to collect it and send to user-space > via cqe->res64. > > Signed-off-by: SelvaKumar S > Signed-off-by: Kanchan Joshi > Signed-off-by: Nitesh Shetty > Signed-off-by: Javier Gonzalez > --- > fs/io_uring.c | 49 ++++++++++++++++++++++++++++++++++++------- > include/uapi/linux/io_uring.h | 9 ++++++-- > 2 files changed, 48 insertions(+), 10 deletions(-) > > diff --git a/fs/io_uring.c b/fs/io_uring.c > index 7809ab2..6510cf5 100644 > --- a/fs/io_uring.c > +++ b/fs/io_uring.c ... > @@ -1244,8 +1254,15 @@ static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) > req->flags &= ~REQ_F_OVERFLOW; > if (cqe) { > WRITE_ONCE(cqe->user_data, req->user_data); > - WRITE_ONCE(cqe->res, req->result); > - WRITE_ONCE(cqe->flags, req->cflags); > + if (unlikely(req->flags & REQ_F_ZONE_APPEND)) { > + if (likely(req->result > 0)) > + WRITE_ONCE(cqe->res64, req->rw.append_offset); > + else > + WRITE_ONCE(cqe->res64, req->result); > + } else { > + WRITE_ONCE(cqe->res, req->result); > + WRITE_ONCE(cqe->flags, req->cflags); > + } > } else { > WRITE_ONCE(ctx->rings->cq_overflow, > atomic_inc_return(&ctx->cached_cq_overflow)); > @@ -1284,8 +1301,15 @@ static void __io_cqring_fill_event(struct io_kiocb *req, long res, long cflags) > cqe = io_get_cqring(ctx); > if (likely(cqe)) { > WRITE_ONCE(cqe->user_data, req->user_data); > - WRITE_ONCE(cqe->res, res); > - WRITE_ONCE(cqe->flags, cflags); > + if (unlikely(req->flags & REQ_F_ZONE_APPEND)) { > + if (likely(res > 0)) > + WRITE_ONCE(cqe->res64, req->rw.append_offset); 1. as I mentioned before, that's not not nice to ignore @cflags 2. that's not the right place for opcode specific handling 3. it doesn't work with overflowed reqs, see the final else below For this scheme, I'd pass @append_offset as an argument. That should also remove this extra if from the fast path, which Jens mentioned. > + else > + WRITE_ONCE(cqe->res64, res); > + } else { > + WRITE_ONCE(cqe->res, res); > + WRITE_ONCE(cqe->flags, cflags); > + } > } else if (ctx->cq_overflow_flushed) { > WRITE_ONCE(ctx->rings->cq_overflow, > atomic_inc_return(&ctx->cached_cq_overflow)); > @@ -1943,7 +1967,7 @@ static inline void req_set_fail_links(struct io_kiocb *req) > req->flags |= REQ_F_FAIL_LINK; > } > -- Pavel Begunkov