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Diffstat (limited to 'fs/nfs/namespace.c')
-rw-r--r--fs/nfs/namespace.c67
1 files changed, 58 insertions, 9 deletions
diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index f3ece8ed3203..6b063227e34e 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -145,6 +145,7 @@ struct vfsmount *nfs_d_automount(struct path *path)
struct vfsmount *mnt = ERR_PTR(-ENOMEM);
struct nfs_server *server = NFS_SERVER(d_inode(path->dentry));
struct nfs_client *client = server->nfs_client;
+ int timeout = READ_ONCE(nfs_mountpoint_expiry_timeout);
int ret;
if (IS_ROOT(path->dentry))
@@ -190,12 +191,12 @@ struct vfsmount *nfs_d_automount(struct path *path)
if (IS_ERR(mnt))
goto out_fc;
- if (nfs_mountpoint_expiry_timeout < 0)
+ mntget(mnt); /* prevent immediate expiration */
+ if (timeout <= 0)
goto out_fc;
- mntget(mnt); /* prevent immediate expiration */
mnt_set_expiry(mnt, &nfs_automount_list);
- schedule_delayed_work(&nfs_automount_task, nfs_mountpoint_expiry_timeout);
+ schedule_delayed_work(&nfs_automount_task, timeout);
out_fc:
put_fs_context(fc);
@@ -233,10 +234,11 @@ const struct inode_operations nfs_referral_inode_operations = {
static void nfs_expire_automounts(struct work_struct *work)
{
struct list_head *list = &nfs_automount_list;
+ int timeout = READ_ONCE(nfs_mountpoint_expiry_timeout);
mark_mounts_for_expiry(list);
- if (!list_empty(list))
- schedule_delayed_work(&nfs_automount_task, nfs_mountpoint_expiry_timeout);
+ if (!list_empty(list) && timeout > 0)
+ schedule_delayed_work(&nfs_automount_task, timeout);
}
void nfs_release_automount_timer(void)
@@ -247,10 +249,7 @@ void nfs_release_automount_timer(void)
/**
* nfs_do_submount - set up mountpoint when crossing a filesystem boundary
- * @dentry: parent directory
- * @fh: filehandle for new root dentry
- * @fattr: attributes for new root inode
- * @authflavor: security flavor to use when performing the mount
+ * @fc: pointer to struct nfs_fs_context
*
*/
int nfs_do_submount(struct fs_context *fc)
@@ -312,3 +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.");