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SubjectRe: [RFC PATCH 7/9] fuse: add fuse device ioctl(FUSE_DEV_IOC_REINIT)
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On 2/20/23 20:37, Alexander Mikhalitsyn wrote:
> This ioctl aborts fuse connection and then reinitializes it,
> sends FUSE_INIT request to allow a new userspace daemon
> to pick up the fuse connection.
>
> Cc: Miklos Szeredi <mszeredi@redhat.com>
> Cc: Al Viro <viro@zeniv.linux.org.uk>
> Cc: Amir Goldstein <amir73il@gmail.com>
> Cc: Stéphane Graber <stgraber@ubuntu.com>
> Cc: Seth Forshee <sforshee@kernel.org>
> Cc: Christian Brauner <brauner@kernel.org>
> Cc: Andrei Vagin <avagin@gmail.com>
> Cc: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
> Cc: linux-fsdevel@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Cc: criu@openvz.org
> Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>
> ---
> fs/fuse/dev.c | 132 ++++++++++++++++++++++++++++++++++++++
> include/uapi/linux/fuse.h | 1 +
> 2 files changed, 133 insertions(+)
>
> diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
> index 737764c2295e..0f53ffd63957 100644
> --- a/fs/fuse/dev.c
> +++ b/fs/fuse/dev.c
> @@ -2187,6 +2187,112 @@ void fuse_abort_conn(struct fuse_conn *fc)
> }
> EXPORT_SYMBOL_GPL(fuse_abort_conn);
>
> +static int fuse_reinit_conn(struct fuse_conn *fc)
> +{
> + struct fuse_iqueue *fiq = &fc->iq;
> + struct fuse_dev *fud;
> + unsigned int i;
> +
> + if (fc->conn_gen + 1 < fc->conn_gen)
> + return -EOVERFLOW;
> +
> + fuse_abort_conn(fc);
> + fuse_wait_aborted(fc);

Shouldn't this also try to flush all data first?

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