nfsd: persist nfsd filesystem across mounts
Keep around one internal mount of the nfsd filesystem so that we can add
stuff to it when clients come and go, regardless of whether anyone has
it mounted.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h
index ceb413f..df4ba4b 100644
--- a/fs/nfsd/netns.h
+++ b/fs/nfsd/netns.h
@@ -42,6 +42,9 @@
bool grace_ended;
time_t boot_time;
+ /* internal mount of the "nfsd" pseudofilesystem: */
+ struct vfsmount *nfsd_mnt;
+
/*
* reclaim_str_hashtbl[] holds known client info from previous reset/reboot
* used in reboot/reset lease grace period processing
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 304a95e..25910a7 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -1232,6 +1232,7 @@
static __net_init int nfsd_init_net(struct net *net)
{
int retval;
+ struct vfsmount *mnt;
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
retval = nfsd_export_init(net);
@@ -1255,8 +1256,17 @@
atomic_set(&nn->ntf_refcnt, 0);
init_waitqueue_head(&nn->ntf_wq);
+
+ mnt = vfs_kern_mount(&nfsd_fs_type, SB_KERNMOUNT, "nfsd", NULL);
+ if (IS_ERR(mnt)) {
+ retval = PTR_ERR(mnt);
+ goto out_mount_err;
+ }
+ nn->nfsd_mnt = mnt;
return 0;
+out_mount_err:
+ nfsd_reply_cache_shutdown(nn);
out_drc_error:
nfsd_idmap_shutdown(net);
out_idmap_error:
@@ -1269,6 +1279,7 @@
{
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+ mntput(nn->nfsd_mnt);
nfsd_reply_cache_shutdown(nn);
nfsd_idmap_shutdown(net);
nfsd_export_shutdown(net);
