From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Setting nfs_mountpoint_expiry_timeout() to a negative value stops
mountpoint expiration, while setting it to a positive value restarts
the scheduler.
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
---
fs/nfs/namespace.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)
diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index fe19ae280262..6b063227e34e 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -311,3 +311,53 @@ int nfs_submount(struct fs_context *fc, struct nfs_server *server)
return nfs_do_submount(fc);
}
EXPORT_SYMBOL_GPL(nfs_submount);
+
+static int param_set_nfs_timeout(const char *val, const struct kernel_param *kp)
+{
+ long num;
+ int ret;
+
+ if (!val)
+ return -EINVAL;
+ ret = kstrtol(val, 0, &num);
+ if (ret)
+ return -EINVAL;
+ if (num > 0) {
+ if (num >= INT_MAX / HZ)
+ num = INT_MAX;
+ else
+ num *= HZ;
+ *((int *)kp->arg) = num;
+ if (!list_empty(&nfs_automount_list))
+ mod_delayed_work(system_wq, &nfs_automount_task, num);
+ } else {
+ *((int *)kp->arg) = -1*HZ;
+ cancel_delayed_work(&nfs_automount_task);
+ }
+ return 0;
+}
+
+static int param_get_nfs_timeout(char *buffer, const struct kernel_param *kp)
+{
+ long num = *((int *)kp->arg);
+
+ if (num > 0) {
+ if (num >= INT_MAX - (HZ - 1))
+ num = INT_MAX / HZ;
+ else
+ num = (num + (HZ - 1)) / HZ;
+ } else
+ num = -1;
+ return scnprintf(buffer, PAGE_SIZE, "%li\n", num);
+}
+
+static const struct kernel_param_ops param_ops_nfs_timeout = {
+ .set = param_set_nfs_timeout,
+ .get = param_get_nfs_timeout,
+};
+#define param_check_nfs_timeout(name, p) __param_check(name, p, int);
+
+module_param(nfs_mountpoint_expiry_timeout, nfs_timeout, 0644);
+MODULE_PARM_DESC(nfs_mountpoint_expiry_timeout,
+ "Set the NFS automounted mountpoint timeout value (seconds)."
+ "Values <= 0 turn expiration off.");
--
2.25.1
