• Jens Axboe's avatar
    io_uring: add support for sqe links · 9e645e11
    Jens Axboe authored
    With SQE links, we can create chains of dependent SQEs. One example
    would be queueing an SQE that's a read from one file descriptor, with
    the linked SQE being a write to another with the same set of buffers.
    
    An SQE link will not stall the pipeline, it'll just ensure that
    dependent SQEs aren't issued before the previous link has completed.
    
    Any error at submission or completion time will break the chain of SQEs.
    For completions, this also includes short reads or writes, as the next
    SQE could depend on the previous one being fully completed.
    
    Any SQE in a chain that gets canceled due to any of the above errors,
    will get an CQE fill with -ECANCELED as the error value.
    Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
    9e645e11
io_uring.c 80.1 KB