[PATCH v5 1/1] ceph: mount syntax module parameter

[Venky Shankar <vshankar@xxxxxxxxxx>]

Add read-only paramaters for supported mount syntaxes. Primary
user is the user-space mount helper for catching v2 syntax bugs
during testing by cross verifying if the kernel supports v2 syntax
on mount failure.

Signed-off-by: Venky Shankar <vshankar@xxxxxxxxxx>
---
 fs/ceph/super.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index 609ffc8c2d78..32e5240e33a0 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -1452,6 +1452,14 @@ bool disable_send_metrics = false;
 module_param_cb(disable_send_metrics, &param_ops_metrics, &disable_send_metrics, 0644);
 MODULE_PARM_DESC(disable_send_metrics, "Enable sending perf metrics to ceph cluster (default: on)");
 
+/* for both v1 and v2 syntax */
+bool mount_support = true;
+static const struct kernel_param_ops param_ops_mount_syntax = {
+	.get = param_get_bool,
+};
+module_param_cb(mount_syntax_v1, &param_ops_mount_syntax, &mount_support, 0444);
+module_param_cb(mount_syntax_v2, &param_ops_mount_syntax, &mount_support, 0444);
+
 module_init(init_ceph);
 module_exit(exit_ceph);
 
-- 
2.27.0