io_uring: remove work flags after cleanup

Shouldn't be a problem now, but it's better to clean
REQ_F_WORK_INITIALIZED and work->flags only after relevant resources are
killed, so cancellation see them.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 9354e61..9b1f919 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1374,22 +1374,14 @@ static void io_req_clean_work(struct io_kiocb *req)
        if (!(req->flags & REQ_F_WORK_INITIALIZED))
                return;
 
-       req->flags &= ~REQ_F_WORK_INITIALIZED;
-
-       if (req->work.flags & IO_WQ_WORK_MM) {
+       if (req->work.flags & IO_WQ_WORK_MM)
                mmdrop(req->work.identity->mm);
-               req->work.flags &= ~IO_WQ_WORK_MM;
-       }
 #ifdef CONFIG_BLK_CGROUP
-       if (req->work.flags & IO_WQ_WORK_BLKCG) {
+       if (req->work.flags & IO_WQ_WORK_BLKCG)
                css_put(req->work.identity->blkcg_css);
-               req->work.flags &= ~IO_WQ_WORK_BLKCG;
-       }
 #endif
-       if (req->work.flags & IO_WQ_WORK_CREDS) {
+       if (req->work.flags & IO_WQ_WORK_CREDS)
                put_cred(req->work.identity->creds);
-               req->work.flags &= ~IO_WQ_WORK_CREDS;
-       }
        if (req->work.flags & IO_WQ_WORK_FS) {
                struct fs_struct *fs = req->work.identity->fs;
 
@@ -1399,12 +1391,10 @@ static void io_req_clean_work(struct io_kiocb *req)
                spin_unlock(&req->work.identity->fs->lock);
                if (fs)
                        free_fs_struct(fs);
-               req->work.flags &= ~IO_WQ_WORK_FS;
        }
        if (req->work.flags & IO_WQ_WORK_FILES) {
                put_files_struct(req->work.identity->files);
                put_nsproxy(req->work.identity->nsproxy);
-               req->work.flags &= ~IO_WQ_WORK_FILES;
        }
        if (req->flags & REQ_F_INFLIGHT) {
                struct io_ring_ctx *ctx = req->ctx;
@@ -1419,6 +1409,9 @@ static void io_req_clean_work(struct io_kiocb *req)
                        wake_up(&tctx->wait);
        }
 
+       req->flags &= ~REQ_F_WORK_INITIALIZED;
+       req->work.flags &= ~(IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | IO_WQ_WORK_FS |
+                            IO_WQ_WORK_CREDS | IO_WQ_WORK_FILES);
        io_put_identity(req->task->io_uring, req);
 }