io-wq: cancel request if it's asking for files and we don't have them

This can't currently happen, but will be possible shortly. Handle missing
files just like we do not being able to grab a needed mm, and mark the
request as needing cancelation.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/io-wq.c b/fs/io-wq.c
index 02894df7656dd1df1b4a13141c3089bf4ce03518..b53c055bea6a36dba4d3d0d7d957798d5aceec29 100644 (file)
--- a/fs/io-wq.c
+++ b/fs/io-wq.c
@@ -482,6 +482,10 @@ static void io_impersonate_work(struct io_worker *worker,
                current->files = work->identity->files;
                current->nsproxy = work->identity->nsproxy;
                task_unlock(current);
+               if (!work->identity->files) {
+                       /* failed grabbing files, ensure work gets cancelled */
+                       work->flags |= IO_WQ_WORK_CANCEL;
+               }
        }
        if ((work->flags & IO_WQ_WORK_FS) && current->fs != work->identity->fs)
                current->fs = work->identity->fs;