Mike Christie 11f3f500ec
fork: add kernel_clone_args flag to not dup/clone files ...
Each vhost device gets a thread that is used to perform IO and management
operations. Instead of a thread that is accessing a device, the thread is
part of the device, so when it creates a thread using a helper based on
copy_process we can't dup or clone the parent's files/FDS because it
would do an extra increment on ourself.
Later, when we do:
Qemu process exits:
do_exit -> exit_files -> put_files_struct -> close_files
we would leak the device's resources because of that extra refcount
on the fd or file_struct.
This patch adds a no_files option so these worker threads can prevent
taking an extra refcount on themselves.
Signed-off-by: Mike Christie <michael.christie@oracle.com >
Acked-by: Christian Brauner <brauner@kernel.org >
Acked-by: Michael S. Tsirkin <mst@redhat.com >
Reviewed-by: Christoph Hellwig <hch@lst.de >
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org >
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11f3f500ec