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io_uring: explain io_wq_work::cancel_seq placement 

Add a comment on why we keep ->cancel_seq in struct io_wq_work instead
of struct io_kiocb despite it needed only by io_uring but not io-wq.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/988e87eec9dc700b5dae933df3aefef303502f6c.1655310733.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2022-06-15 17:33:52 +01:00 committed by Jens Axboe
parent aa1e90f64e
commit 48c13d8980
1 changed files with 1 additions and 0 deletions
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io_uring/io-wq.h
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@ -155,6 +155,7 @@ struct io_wq_work_node *wq_stack_extract(struct io_wq_work_node *stack)
struct io_wq_work {
struct io_wq_work_node list;
unsigned flags;
/* place it here instead of io_kiocb as it fills padding and saves 4B */
int cancel_seq;
};