Merge tag 'io_uring-5.10-2020-10-30' of git://git.kernel.dk/linux-block
Pull io_uring fixes from Jens Axboe:
- Fixes for linked timeouts (Pavel)
- Set IO_WQ_WORK_CONCURRENT early for async offload (Pavel)
- Two minor simplifications that make the code easier to read and
follow (Pavel)
* tag 'io_uring-5.10-2020-10-30' of git://git.kernel.dk/linux-block:
io_uring: use type appropriate io_kiocb handler for double poll
io_uring: simplify __io_queue_sqe()
io_uring: simplify nxt propagation in io_queue_sqe
io_uring: don't miss setting IO_WQ_WORK_CONCURRENT
io_uring: don't defer put of cancelled ltimeout
io_uring: always clear LINK_TIMEOUT after cancel
io_uring: don't adjust LINK_HEAD in cancel ltimeout
io_uring: remove opcode check on ltimeout kill
diff --git a/fs/io_uring.c b/fs/io_uring.c
index b42dfa0..a7429c9 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1365,6 +1365,9 @@
io_req_init_async(req);
id = req->work.identity;
+ if (req->flags & REQ_F_FORCE_ASYNC)
+ req->work.flags |= IO_WQ_WORK_CONCURRENT;
+
if (req->flags & REQ_F_ISREG) {
if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL))
io_wq_hash_work(&req->work, file_inode(req->file));
@@ -1846,59 +1849,39 @@
percpu_ref_put(&ctx->refs);
}
-static bool io_link_cancel_timeout(struct io_kiocb *req)
+static void io_kill_linked_timeout(struct io_kiocb *req)
{
- struct io_timeout_data *io = req->async_data;
struct io_ring_ctx *ctx = req->ctx;
- int ret;
-
- ret = hrtimer_try_to_cancel(&io->timer);
- if (ret != -1) {
- io_cqring_fill_event(req, -ECANCELED);
- io_commit_cqring(ctx);
- req->flags &= ~REQ_F_LINK_HEAD;
- io_put_req_deferred(req, 1);
- return true;
- }
-
- return false;
-}
-
-static bool __io_kill_linked_timeout(struct io_kiocb *req)
-{
struct io_kiocb *link;
- bool wake_ev;
+ bool cancelled = false;
+ unsigned long flags;
- if (list_empty(&req->link_list))
- return false;
- link = list_first_entry(&req->link_list, struct io_kiocb, link_list);
- if (link->opcode != IORING_OP_LINK_TIMEOUT)
- return false;
+ spin_lock_irqsave(&ctx->completion_lock, flags);
+ link = list_first_entry_or_null(&req->link_list, struct io_kiocb,
+ link_list);
/*
* Can happen if a linked timeout fired and link had been like
* req -> link t-out -> link t-out [-> ...]
*/
- if (!(link->flags & REQ_F_LTIMEOUT_ACTIVE))
- return false;
+ if (link && (link->flags & REQ_F_LTIMEOUT_ACTIVE)) {
+ struct io_timeout_data *io = link->async_data;
+ int ret;
- list_del_init(&link->link_list);
- wake_ev = io_link_cancel_timeout(link);
+ list_del_init(&link->link_list);
+ ret = hrtimer_try_to_cancel(&io->timer);
+ if (ret != -1) {
+ io_cqring_fill_event(link, -ECANCELED);
+ io_commit_cqring(ctx);
+ cancelled = true;
+ }
+ }
req->flags &= ~REQ_F_LINK_TIMEOUT;
- return wake_ev;
-}
-
-static void io_kill_linked_timeout(struct io_kiocb *req)
-{
- struct io_ring_ctx *ctx = req->ctx;
- unsigned long flags;
- bool wake_ev;
-
- spin_lock_irqsave(&ctx->completion_lock, flags);
- wake_ev = __io_kill_linked_timeout(req);
spin_unlock_irqrestore(&ctx->completion_lock, flags);
- if (wake_ev)
+ if (cancelled) {
io_cqring_ev_posted(ctx);
+ io_put_req(link);
+ }
}
static struct io_kiocb *io_req_link_next(struct io_kiocb *req)
@@ -4977,8 +4960,10 @@
/* make sure double remove sees this as being gone */
wait->private = NULL;
spin_unlock(&poll->head->lock);
- if (!done)
- __io_async_wake(req, poll, mask, io_poll_task_func);
+ if (!done) {
+ /* use wait func handler, so it matches the rq type */
+ poll->wait.func(&poll->wait, mode, sync, key);
+ }
}
refcount_dec(&req->refs);
return 1;
@@ -6180,7 +6165,6 @@
static void __io_queue_sqe(struct io_kiocb *req, struct io_comp_state *cs)
{
struct io_kiocb *linked_timeout;
- struct io_kiocb *nxt;
const struct cred *old_creds = NULL;
int ret;
@@ -6206,7 +6190,6 @@
*/
if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) {
if (!io_arm_poll_handler(req)) {
-punt:
/*
* Queued up for async execution, worker will release
* submit reference when the iocb is actually submitted.
@@ -6216,33 +6199,25 @@
if (linked_timeout)
io_queue_linked_timeout(linked_timeout);
- goto exit;
- }
+ } else if (likely(!ret)) {
+ /* drop submission reference */
+ req = io_put_req_find_next(req);
+ if (linked_timeout)
+ io_queue_linked_timeout(linked_timeout);
- if (unlikely(ret)) {
+ if (req) {
+ if (!(req->flags & REQ_F_FORCE_ASYNC))
+ goto again;
+ io_queue_async_work(req);
+ }
+ } else {
/* un-prep timeout, so it'll be killed as any other linked */
req->flags &= ~REQ_F_LINK_TIMEOUT;
req_set_fail_links(req);
io_put_req(req);
io_req_complete(req, ret);
- goto exit;
}
- /* drop submission reference */
- nxt = io_put_req_find_next(req);
- if (linked_timeout)
- io_queue_linked_timeout(linked_timeout);
-
- if (nxt) {
- req = nxt;
-
- if (req->flags & REQ_F_FORCE_ASYNC) {
- linked_timeout = NULL;
- goto punt;
- }
- goto again;
- }
-exit:
if (old_creds)
revert_creds(old_creds);
}
@@ -6266,13 +6241,6 @@
if (unlikely(ret))
goto fail_req;
}
-
- /*
- * Never try inline submit of IOSQE_ASYNC is set, go straight
- * to async execution.
- */
- io_req_init_async(req);
- req->work.flags |= IO_WQ_WORK_CONCURRENT;
io_queue_async_work(req);
} else {
if (sqe) {
