Merge tag 'io_uring-5.9-2020-10-02' of git://git.kernel.dk/linux-block (702bfc89) · Commits · 戴 / test

fs/io_uring.c

+18 −5

Original line number	Diff line number	Diff line
		@@ -3049,6 +3049,7 @@ static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode,
		if (!wake_page_match(wpq, key))
		return 0;

		req->rw.kiocb.ki_flags &= ~IOCB_WAITQ;
		list_del_init(&wait->entry);

		init_task_work(&req->task_work, io_req_task_submit);
		@@ -3106,6 +3107,7 @@ static bool io_rw_should_retry(struct io_kiocb *req)
		wait->wait.flags = 0;
		INIT_LIST_HEAD(&wait->wait.entry);
		kiocb->ki_flags \|= IOCB_WAITQ;
		kiocb->ki_flags &= ~IOCB_NOWAIT;
		kiocb->ki_waitq = wait;

		io_get_req_task(req);
		@@ -4743,6 +4745,8 @@ static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode,
		if (mask && !(mask & poll->events))
		return 0;

		list_del_init(&wait->entry);

		if (poll && poll->head) {
		bool done;

		@@ -8412,11 +8416,19 @@ static int io_uring_show_cred(int id, void p, void data)

		static void __io_uring_show_fdinfo(struct io_ring_ctx ctx, struct seq_file m)
		{
		bool has_lock;
		int i;

		mutex_lock(&ctx->uring_lock);
		/*
		* Avoid ABBA deadlock between the seq lock and the io_uring mutex,
		* since fdinfo case grabs it in the opposite direction of normal use
		* cases. If we fail to get the lock, we just don't iterate any
		* structures that could be going away outside the io_uring mutex.
		*/
		has_lock = mutex_trylock(&ctx->uring_lock);

		seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files);
		for (i = 0; i < ctx->nr_user_files; i++) {
		for (i = 0; has_lock && i < ctx->nr_user_files; i++) {
		struct fixed_file_table *table;
		struct file *f;

		@@ -8428,13 +8440,13 @@ static void __io_uring_show_fdinfo(struct io_ring_ctx ctx, struct seq_file m)
		seq_printf(m, "%5u: <none>\n", i);
		}
		seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs);
		for (i = 0; i < ctx->nr_user_bufs; i++) {
		for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) {
		struct io_mapped_ubuf *buf = &ctx->user_bufs[i];

		seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf,
		(unsigned int) buf->len);
		}
		if (!idr_is_empty(&ctx->personality_idr)) {
		if (has_lock && !idr_is_empty(&ctx->personality_idr)) {
		seq_printf(m, "Personalities:\n");
		idr_for_each(&ctx->personality_idr, io_uring_show_cred, m);
		}
		@@ -8449,6 +8461,7 @@ static void __io_uring_show_fdinfo(struct io_ring_ctx ctx, struct seq_file m)
		req->task->task_works != NULL);
		}
		spin_unlock_irq(&ctx->completion_lock);
		if (has_lock)
		mutex_unlock(&ctx->uring_lock);
		}

mm/filemap.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -2365,7 +2365,11 @@ readpage:
		}

		if (!PageUptodate(page)) {
		if (iocb->ki_flags & IOCB_WAITQ)
		error = lock_page_async(page, iocb->ki_waitq);
		else
		error = lock_page_killable(page);

		if (unlikely(error))
		goto readpage_error;
		if (!PageUptodate(page)) {

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