From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

Date: Mon, 27 Jan 2020 19:01:41 +0000

Subject: [PATCH] virtiofsd: Handle hard reboot

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Handle a

  mount

  hard reboot (without unmount)

  mount

we get another 'init' which FUSE doesn't normally expect.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

(cherry picked from commit e8556f49098b5d95634e592d79a97f761b76c96e)

---

 tools/virtiofsd/fuse_lowlevel.c | 16 +++++++++++++++-

 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/tools/virtiofsd/fuse_lowlevel.c b/tools/virtiofsd/fuse_lowlevel.c

index 7d742b5a72..65f91dabae 100644

--- a/tools/virtiofsd/fuse_lowlevel.c

+++ b/tools/virtiofsd/fuse_lowlevel.c

@@ -2433,7 +2433,21 @@ void fuse_session_process_buf_int(struct fuse_session *se,

             goto reply_err;

         }

     } else if (in->opcode == FUSE_INIT || in->opcode == CUSE_INIT) {

-        goto reply_err;

+        if (fuse_lowlevel_is_virtio(se)) {

+            /*

+             * TODO: This is after a hard reboot typically, we need to do

+             * a destroy, but we can't reply to this request yet so

+             * we can't use do_destroy

+             */

+            fuse_log(FUSE_LOG_DEBUG, "%s: reinit\n", __func__);

+            se->got_destroy = 1;

+            se->got_init = 0;

+            if (se->op.destroy) {

+                se->op.destroy(se->userdata);

+            }

+        } else {

+            goto reply_err;

+        }

     }

     err = EACCES;