block: Fix io_context leak after failure of clone with CLONE_IO
With CLONE_IO, parent's io_context->nr_tasks is incremented, but never
decremented whenever copy_process() fails afterwards, which prevents
exit_io_context() from calling IO schedulers exit functions.
Give a task_struct to exit_io_context(), and call exit_io_context() instead of
put_io_context() in copy_process() cleanup path.
Signed-off-by: Louis Rilling <louis.rilling@kerlabs.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/include/linux/iocontext.h b/include/linux/iocontext.h
index d61b0b8..a632359 100644
--- a/include/linux/iocontext.h
+++ b/include/linux/iocontext.h
@@ -98,14 +98,15 @@
return NULL;
}
+struct task_struct;
#ifdef CONFIG_BLOCK
int put_io_context(struct io_context *ioc);
-void exit_io_context(void);
+void exit_io_context(struct task_struct *task);
struct io_context *get_io_context(gfp_t gfp_flags, int node);
struct io_context *alloc_io_context(gfp_t gfp_flags, int node);
void copy_io_context(struct io_context **pdst, struct io_context **psrc);
#else
-static inline void exit_io_context(void)
+static inline void exit_io_context(struct task_struct *task)
{
}