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io_uring: cancel not-armed linked touts separately

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Adjust io_disarm_next(), so it can detect if there is a linked but
not-yet-armed timeout and complete/cancel it separately. Will be used in
the following patch.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/ae228cde2c0df3d92d29d5e4852ed9fa8a2a97db.1628981736.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-08-15 10:40:25 +01:00 committed by Jens Axboe
parent 4d13d1a4d1
commit 0756a86910
1 changed files with 16 additions and 3 deletions
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19
fs/io_uring.c
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@ -1034,6 +1034,9 @@ static const struct io_op_def io_op_defs[] = {
[IORING_OP_UNLINKAT] = {},
};
/* requests with any of those set should undergo io_disarm_next() */
#define IO_DISARM_MASK (REQ_F_ARM_LTIMEOUT | REQ_F_LINK_TIMEOUT | REQ_F_FAIL)
static bool io_disarm_next(struct io_kiocb *req);
static void io_uring_del_tctx_node(unsigned long index);
static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx,
@ -1688,7 +1691,7 @@ static void io_req_complete_post(struct io_kiocb *req, long res,
*/
if (req_ref_put_and_test(req)) {
if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) {
if (req->flags & (REQ_F_LINK_TIMEOUT | REQ_F_FAIL))
if (req->flags & IO_DISARM_MASK)
io_disarm_next(req);
if (req->link) {
io_req_task_queue(req->link);
@ -1926,7 +1929,17 @@ static bool io_disarm_next(struct io_kiocb *req)
{
bool posted = false;
if (likely(req->flags & REQ_F_LINK_TIMEOUT)) {
if (req->flags & REQ_F_ARM_LTIMEOUT) {
struct io_kiocb *link = req->link;
if (link && link->opcode == IORING_OP_LINK_TIMEOUT) {
io_remove_next_linked(req);
io_cqring_fill_event(link->ctx, link->user_data,
-ECANCELED, 0);
io_put_req_deferred(link);
posted = true;
}
} else if (req->flags & REQ_F_LINK_TIMEOUT) {
struct io_ring_ctx *ctx = req->ctx;
spin_lock_irq(&ctx->timeout_lock);
@ -1951,7 +1964,7 @@ static struct io_kiocb *__io_req_find_next(struct io_kiocb *req)
* dependencies to the next request. In case of failure, fail the rest
* of the chain.
*/
if (req->flags & (REQ_F_LINK_TIMEOUT | REQ_F_FAIL)) {
if (req->flags & IO_DISARM_MASK) {
struct io_ring_ctx *ctx = req->ctx;
bool posted;