[PATCH 07/16] io_uring: account io_uring internal files as REQ_F_INFLIGHT

[Pavel Begunkov <asml.silence@xxxxxxxxx>]

From: Jens Axboe <axboe@xxxxxxxxx>

[ Upstream commit 02a13674fa0e8dd326de8b9f4514b41b03d99003 ]

We need to actively cancel anything that introduces a potential circular
loop, where io_uring holds a reference to itself. If the file in question
is an io_uring file, then add the request to the inflight list.

Cc: stable@xxxxxxxxxxxxxxx # 5.9+
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
---
 fs/io_uring.c | 32 ++++++++++++++++++++++++--------
 1 file changed, 24 insertions(+), 8 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index a40ee81e6438..9801fa9b00ba 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1000,6 +1000,9 @@ static inline void io_clean_op(struct io_kiocb *req)
 static inline bool __io_match_files(struct io_kiocb *req,
 				    struct files_struct *files)
 {
+	if (req->file && req->file->f_op == &io_uring_fops)
+		return true;
+
 	return ((req->flags & REQ_F_WORK_INITIALIZED) &&
 	        (req->work.flags & IO_WQ_WORK_FILES)) &&
 		req->work.identity->files == files;
@@ -1398,11 +1401,14 @@ static bool io_grab_identity(struct io_kiocb *req)
 			return false;
 		atomic_inc(&id->files->count);
 		get_nsproxy(id->nsproxy);
-		req->flags |= REQ_F_INFLIGHT;
 
-		spin_lock_irq(&ctx->inflight_lock);
-		list_add(&req->inflight_entry, &ctx->inflight_list);
-		spin_unlock_irq(&ctx->inflight_lock);
+		if (!(req->flags & REQ_F_INFLIGHT)) {
+			req->flags |= REQ_F_INFLIGHT;
+
+			spin_lock_irq(&ctx->inflight_lock);
+			list_add(&req->inflight_entry, &ctx->inflight_list);
+			spin_unlock_irq(&ctx->inflight_lock);
+		}
 		req->work.flags |= IO_WQ_WORK_FILES;
 	}
 	if (!(req->work.flags & IO_WQ_WORK_MM) &&
@@ -5886,8 +5892,10 @@ static void io_req_drop_files(struct io_kiocb *req)
 	struct io_ring_ctx *ctx = req->ctx;
 	unsigned long flags;
 
-	put_files_struct(req->work.identity->files);
-	put_nsproxy(req->work.identity->nsproxy);
+	if (req->work.flags & IO_WQ_WORK_FILES) {
+		put_files_struct(req->work.identity->files);
+		put_nsproxy(req->work.identity->nsproxy);
+	}
 	spin_lock_irqsave(&ctx->inflight_lock, flags);
 	list_del(&req->inflight_entry);
 	spin_unlock_irqrestore(&ctx->inflight_lock, flags);
@@ -6159,6 +6167,15 @@ static struct file *io_file_get(struct io_submit_state *state,
 		file = __io_file_get(state, fd);
 	}
 
+	if (file && file->f_op == &io_uring_fops) {
+		io_req_init_async(req);
+		req->flags |= REQ_F_INFLIGHT;
+
+		spin_lock_irq(&ctx->inflight_lock);
+		list_add(&req->inflight_entry, &ctx->inflight_list);
+		spin_unlock_irq(&ctx->inflight_lock);
+	}
+
 	return file;
 }
 
@@ -8578,8 +8595,7 @@ static void io_uring_cancel_files(struct io_ring_ctx *ctx,
 
 		spin_lock_irq(&ctx->inflight_lock);
 		list_for_each_entry(req, &ctx->inflight_list, inflight_entry) {
-			if (req->task != task ||
-			    req->work.identity->files != files)
+			if (!io_match_task(req, task, files))
 				continue;
 			found = true;
 			break;
-- 
2.24.0