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io_uring: add zc notification flush requests

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Overlay notification control onto IORING_OP_RSRC_UPDATE (former
IORING_OP_FILES_UPDATE). It allows to flush a range of zc notifications
from slots with indexes [sqe->off, sqe->off+sqe->len). If sqe->arg is
not zero, it also copies sqe->arg as a new tag for all flushed
notifications.

Note, it doesn't flush a notification of a slot if there was no requests
attached to it (since last flush or registration).

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/df13e2363400682a73dd9e71c3b990b8d1ff0333.1657643355.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2022-07-12 21:52:49 +01:00 • committed by Jens Axboe
parent 4379d5f15b
commit 492dddb4f6
2 changed files with 39 additions and 0 deletions
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1
include/uapi/linux/io_uring.h
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@ -297,6 +297,7 @@ enum io_uring_op {
*/
enum {
IORING_RSRC_UPDATE_FILES,
IORING_RSRC_UPDATE_NOTIF,
};
/*