FUSE_SUBMOUNTS is a pure indicator by the kernel to signal that it
supports submounts. It does not check its state in the init reply, so
there is nothing for fuse_lowlevel.c to do but to check its existence
and copy it into fuse_conn_info.capable.
Signed-off-by: Max Reitz <mre...@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com>
---
tools/virtiofsd/fuse_common.h | 7 +++++++
tools/virtiofsd/fuse_lowlevel.c | 3 +++
2 files changed, 10 insertions(+)
diff --git a/tools/virtiofsd/fuse_common.h b/tools/virtiofsd/fuse_common.h
index 686c42c0a5..5aee5193eb 100644
--- a/tools/virtiofsd/fuse_common.h
+++ b/tools/virtiofsd/fuse_common.h
@@ -352,6 +352,13 @@ struct fuse_file_info {
*/
#define FUSE_CAP_NO_OPENDIR_SUPPORT (1 << 24)
+/**
+ * Indicates that the kernel supports the FUSE_ATTR_SUBMOUNT flag.
+ *
+ * Setting (or unsetting) this flag in the `want` field has *no effect*.
+ */
+#define FUSE_CAP_SUBMOUNTS (1 << 27)
+
/**
* Ioctl flags
*
diff --git a/tools/virtiofsd/fuse_lowlevel.c b/tools/virtiofsd/fuse_lowlevel.c
index 4d1ba2925d..370222339b 100644
--- a/tools/virtiofsd/fuse_lowlevel.c
+++ b/tools/virtiofsd/fuse_lowlevel.c
@@ -1988,6 +1988,9 @@ static void do_init(fuse_req_t req, fuse_ino_t nodeid,
bufsize = max_bufsize;
}
}
+ if (arg->flags & FUSE_SUBMOUNTS) {
+ se->conn.capable |= FUSE_CAP_SUBMOUNTS;
+ }
#ifdef HAVE_SPLICE
#ifdef HAVE_VMSPLICE
se->conn.capable |= FUSE_CAP_SPLICE_WRITE | FUSE_CAP_SPLICE_MOVE;
--
2.26.2
