On Sun, Jul 05, 2020 at 03:00:47PM -0600, Jens Axboe wrote: >On 7/5/20 12:47 PM, Kanchan Joshi wrote: >> From: Selvakumar S >> >> For zone-append, block-layer will return zone-relative offset via ret2 >> of ki_complete interface. Make changes to collect it, and send to >> user-space using cqe->flags. >> >> Signed-off-by: Selvakumar S >> Signed-off-by: Kanchan Joshi >> Signed-off-by: Nitesh Shetty >> Signed-off-by: Javier Gonzalez >> --- >> fs/io_uring.c | 21 +++++++++++++++++++-- >> 1 file changed, 19 insertions(+), 2 deletions(-) >> >> diff --git a/fs/io_uring.c b/fs/io_uring.c >> index 155f3d8..cbde4df 100644 >> --- a/fs/io_uring.c >> +++ b/fs/io_uring.c >> @@ -402,6 +402,8 @@ struct io_rw { >> struct kiocb kiocb; >> u64 addr; >> u64 len; >> + /* zone-relative offset for append, in sectors */ >> + u32 append_offset; >> }; > >I don't like this very much at all. As it stands, the first cacheline >of io_kiocb is set aside for request-private data. io_rw is already >exactly 64 bytes, which means that you're now growing io_rw beyond >a cacheline and increasing the size of io_kiocb as a whole. > >Maybe you can reuse io_rw->len for this, as that is only used on the >submission side of things. Yes, this will be good. Thanks.