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@xxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Amir Goldstein <amir73il@xxxxxxxxx>
Cc: Stéphane Graber <stgraber@xxxxxxxxxx>
Cc: Seth Forshee <sforshee@xxxxxxxxxx>
Cc: Christian Brauner <brauner@xxxxxxxxxx>
Cc: Andrei Vagin <avagin@xxxxxxxxx>
Cc: Pavel Tikhomirov <ptikhomirov@xxxxxxxxxxxxx>
Cc: linux-fsdevel@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: criu@xxxxxxxxxx
Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@xxxxxxxxxxxxx>
---
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?
