[PATCH 1/2] io_uring: wait potential ->release() on resurrect

[Pavel Begunkov <asml.silence@gmail.com>]

There is a short window where percpu_refs are already turned zero, but
we try to do resurrect(). Play nicer and wait for ->release() to happen
in this case and proceed as everything is ok. One little downside is
that we can ignore signal_pending() on a rare occasion, but someone
else should check for it later if needed.

Cc: <stable@vger.kernel.org> # 5.5+
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 fs/io_uring.c | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index f2fdebaf28fe..6ea4633e5ed5 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1104,6 +1104,21 @@ static inline void io_set_resource_node(struct io_kiocb *req)
 	}
 }
 
+static bool io_refs_resurrect(struct percpu_ref *ref, struct completion *compl)
+{
+	if (!percpu_ref_tryget(ref)) {
+		/* already at zero, wait for ->release() */
+		if (!try_wait_for_completion(compl))
+			synchronize_rcu();
+		return false;
+	}
+
+	percpu_ref_resurrect(ref);
+	reinit_completion(compl);
+	percpu_ref_put(ref);
+	return true;
+}
+
 static bool io_match_task(struct io_kiocb *head,
 			  struct task_struct *task,
 			  struct files_struct *files)
@@ -10094,10 +10109,8 @@ static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
 
 		mutex_lock(&ctx->uring_lock);
 
-		if (ret) {
-			percpu_ref_resurrect(&ctx->refs);
-			goto out_quiesce;
-		}
+		if (ret && io_refs_resurrect(&ctx->refs, &ctx->ref_comp))
+			return ret;
 	}
 
 	if (ctx->restricted) {
@@ -10189,7 +10202,6 @@ static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
 	if (io_register_op_must_quiesce(opcode)) {
 		/* bring the ctx back to life */
 		percpu_ref_reinit(&ctx->refs);
-out_quiesce:
 		reinit_completion(&ctx->ref_comp);
 	}
 	return ret;
-- 
2.24.0