NFS: Add a module parameter to set nfs_mountpoint_expiry_timeout (f30a6ea0) · Commits · 戴 / test

fs/nfs/namespace.c

+50 −0

Original line number	Diff line number	Diff line
		@@ -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.");