io_uring: cancel not-armed linked touts separately

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>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 097ba596c819ba0bce976aad2b5fc078e72c855c..8eea3a1e8c215c43b61b77c2d6518dc7cc2efefa 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -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;