From f30a6ea0f3a582cea72b0373612d4b38f383fbd9 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Thu, 2 Apr 2020 12:37:25 -0400 Subject: NFS: Add a module parameter to set nfs_mountpoint_expiry_timeout 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 --- fs/nfs/namespace.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) (limited to 'fs/nfs/namespace.c') 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."); -- cgit v1.2.3