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    Subject[PATCH 6.0 010/862] io_uring: add custom opcode hooks on fail
    Date
    From: Pavel Begunkov <asml.silence@gmail.com>

    commit a47b255e90395bdb481975ab3d9e96fcf8b3165f upstream.

    Sometimes we have to do a little bit of a fixup on a request failuer in
    io_req_complete_failed(). Add a callback in opdef for that.

    Cc: stable@vger.kernel.org
    Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
    Link: https://lore.kernel.org/r/b734cff4e67cb30cca976b9face321023f37549a.1663668091.git.asml.silence@gmail.com
    Signed-off-by: Jens Axboe <axboe@kernel.dk>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    io_uring/io_uring.c | 4 ++++
    io_uring/opdef.h | 1 +
    2 files changed, 5 insertions(+)

    --- a/io_uring/io_uring.c
    +++ b/io_uring/io_uring.c
    @@ -823,8 +823,12 @@ inline void __io_req_complete(struct io_

    void io_req_complete_failed(struct io_kiocb *req, s32 res)
    {
    + const struct io_op_def *def = &io_op_defs[req->opcode];
    +
    req_set_fail(req);
    io_req_set_res(req, res, io_put_kbuf(req, IO_URING_F_UNLOCKED));
    + if (def->fail)
    + def->fail(req);
    io_req_complete_post(req);
    }

    --- a/io_uring/opdef.h
    +++ b/io_uring/opdef.h
    @@ -36,6 +36,7 @@ struct io_op_def {
    int (*issue)(struct io_kiocb *, unsigned int);
    int (*prep_async)(struct io_kiocb *);
    void (*cleanup)(struct io_kiocb *);
    + void (*fail)(struct io_kiocb *);
    };

    extern const struct io_op_def io_op_defs[];

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