forked from Minki/linux
io_uring-5.10-2020-10-30
-----BEGIN PGP SIGNATURE----- iQJEBAABCAAuFiEEwPw5LcreJtl1+l5K99NY+ylx4KYFAl+cRyAQHGF4Ym9lQGtl cm5lbC5kawAKCRD301j7KXHgpiisD/9qmkOK7zfdh6HWyMAKm4m2GHMlhZy56VQ0 MklbKcYblfg69u1lmvcDv5/9l2h3ESxCMDYQbl/yuQ0MepK0PrDyndN3hVg8y8VW tRP6rHvOVBLH/R8C1ClfWJ2gVxrH776GOugV3q7wY8uD+caNug12kjV3YFVwychD akSoSzpCkN5BFfMkWgapcnvQD+SR5lPJeojru9kH94BIUC9zOCgkMVlZ1TAue8B4 VNHP5ghv/t4SWzmKiuLnboGUP6NVk9EPBPmVFNklfdr6kDpkKGRofVnS54/dcRRG JHpP0dvAVSjpKztW2f1fFeG/0OIRYuLuMS5SERrgIacIPVuz21i5VKpNYP7wKb24 oarxRtMBsOmkejfSPiSlGlQkcfB1j6K/13a+xIFkczT62SdO2wPcg/4BFuQx+yq0 Pw8gSXQ3QltcfsojojjQ61cnT1p0mSS7uObcgT6wVQQ8rFQaqSaZLhXFCvrb3731 28py3baghl0IrvFDaBjbJFbetGBhuaMxoBrr3B3sZsF5UMVHXUYgweJB+gGADE3s SlYaYHxgiraPSpl6F8zLse1WGPISRjchTArRcntgYlEXIlFrqWGNKOOIBD6y7OZe 3ARvPaUZsmi6oZ5SlEqTmAsSqZDo0UzyWzpB2yDBLY90Re/b2lwzhapgI4WbqX+W Bngw2TwZFg== =xYFz -----END PGP SIGNATURE----- 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
This commit is contained in:
Linus Torvalds
commit
cf9446cc8e
108
fs/io_uring.c
108
fs/io_uring.c
@ -1365,6 +1365,9 @@ static void io_prep_async_work(struct io_kiocb *req)
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io_req_init_async(req);
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id = req->work.identity;
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if (req->flags & REQ_F_FORCE_ASYNC)
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req->work.flags |= IO_WQ_WORK_CONCURRENT;
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if (req->flags & REQ_F_ISREG) {
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if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL))
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io_wq_hash_work(&req->work, file_inode(req->file));
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@ -1846,59 +1849,39 @@ static void __io_free_req(struct io_kiocb *req)
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percpu_ref_put(&ctx->refs);
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}
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static bool io_link_cancel_timeout(struct io_kiocb *req)
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static void io_kill_linked_timeout(struct io_kiocb *req)
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{
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struct io_timeout_data *io = req->async_data;
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struct io_ring_ctx *ctx = req->ctx;
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int ret;
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ret = hrtimer_try_to_cancel(&io->timer);
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if (ret != -1) {
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io_cqring_fill_event(req, -ECANCELED);
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io_commit_cqring(ctx);
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req->flags &= ~REQ_F_LINK_HEAD;
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io_put_req_deferred(req, 1);
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return true;
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}
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return false;
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}
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static bool __io_kill_linked_timeout(struct io_kiocb *req)
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{
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struct io_kiocb *link;
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bool wake_ev;
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bool cancelled = false;
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unsigned long flags;
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if (list_empty(&req->link_list))
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return false;
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link = list_first_entry(&req->link_list, struct io_kiocb, link_list);
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if (link->opcode != IORING_OP_LINK_TIMEOUT)
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return false;
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spin_lock_irqsave(&ctx->completion_lock, flags);
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link = list_first_entry_or_null(&req->link_list, struct io_kiocb,
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link_list);
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/*
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* Can happen if a linked timeout fired and link had been like
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* req -> link t-out -> link t-out [-> ...]
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*/
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if (!(link->flags & REQ_F_LTIMEOUT_ACTIVE))
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return false;
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if (link && (link->flags & REQ_F_LTIMEOUT_ACTIVE)) {
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struct io_timeout_data *io = link->async_data;
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int ret;
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list_del_init(&link->link_list);
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wake_ev = io_link_cancel_timeout(link);
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list_del_init(&link->link_list);
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ret = hrtimer_try_to_cancel(&io->timer);
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if (ret != -1) {
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io_cqring_fill_event(link, -ECANCELED);
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io_commit_cqring(ctx);
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cancelled = true;
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}
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}
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req->flags &= ~REQ_F_LINK_TIMEOUT;
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return wake_ev;
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}
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static void io_kill_linked_timeout(struct io_kiocb *req)
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{
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struct io_ring_ctx *ctx = req->ctx;
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unsigned long flags;
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bool wake_ev;
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spin_lock_irqsave(&ctx->completion_lock, flags);
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wake_ev = __io_kill_linked_timeout(req);
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spin_unlock_irqrestore(&ctx->completion_lock, flags);
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if (wake_ev)
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if (cancelled) {
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io_cqring_ev_posted(ctx);
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io_put_req(link);
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}
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}
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static struct io_kiocb *io_req_link_next(struct io_kiocb *req)
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@ -4977,8 +4960,10 @@ static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode,
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/* make sure double remove sees this as being gone */
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wait->private = NULL;
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spin_unlock(&poll->head->lock);
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if (!done)
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__io_async_wake(req, poll, mask, io_poll_task_func);
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if (!done) {
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/* use wait func handler, so it matches the rq type */
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poll->wait.func(&poll->wait, mode, sync, key);
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}
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}
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refcount_dec(&req->refs);
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return 1;
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@ -6180,7 +6165,6 @@ static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req)
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static void __io_queue_sqe(struct io_kiocb *req, struct io_comp_state *cs)
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{
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struct io_kiocb *linked_timeout;
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struct io_kiocb *nxt;
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const struct cred *old_creds = NULL;
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int ret;
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@ -6206,7 +6190,6 @@ again:
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*/
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if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) {
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if (!io_arm_poll_handler(req)) {
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punt:
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/*
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* Queued up for async execution, worker will release
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* submit reference when the iocb is actually submitted.
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@ -6216,33 +6199,25 @@ punt:
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if (linked_timeout)
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io_queue_linked_timeout(linked_timeout);
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goto exit;
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}
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} else if (likely(!ret)) {
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/* drop submission reference */
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req = io_put_req_find_next(req);
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if (linked_timeout)
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io_queue_linked_timeout(linked_timeout);
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if (unlikely(ret)) {
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if (req) {
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if (!(req->flags & REQ_F_FORCE_ASYNC))
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goto again;
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io_queue_async_work(req);
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}
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} else {
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/* un-prep timeout, so it'll be killed as any other linked */
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req->flags &= ~REQ_F_LINK_TIMEOUT;
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req_set_fail_links(req);
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io_put_req(req);
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io_req_complete(req, ret);
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goto exit;
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}
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/* drop submission reference */
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nxt = io_put_req_find_next(req);
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if (linked_timeout)
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io_queue_linked_timeout(linked_timeout);
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if (nxt) {
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req = nxt;
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if (req->flags & REQ_F_FORCE_ASYNC) {
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linked_timeout = NULL;
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goto punt;
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}
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goto again;
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}
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exit:
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if (old_creds)
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revert_creds(old_creds);
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}
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@ -6266,13 +6241,6 @@ fail_req:
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if (unlikely(ret))
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goto fail_req;
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}
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/*
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* Never try inline submit of IOSQE_ASYNC is set, go straight
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* to async execution.
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*/
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io_req_init_async(req);
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req->work.flags |= IO_WQ_WORK_CONCURRENT;
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io_queue_async_work(req);
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} else {
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if (sqe) {
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