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nfsd: Ensure knfsd shuts down when the "nfsd" pseudofs is unmounted

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In order to ensure that knfsd threads don't linger once the nfsd
pseudofs is unmounted (e.g. when the container is killed) we let
nfsd_umount() shut down those threads and wait for them to exit.

This also should ensure that we don't need to do a kernel mount of
the pseudofs, since the thread lifetime is now limited by the
lifetime of the filesystem.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Trond Myklebust 2021-03-13 16:08:47 -05:00 committed by Chuck Lever
parent f988a7b71d
commit c6c7f2a84d
5 changed files with 41 additions and 25 deletions
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6
fs/nfsd/netns.h
View File

@ -51,9 +51,6 @@ struct nfsd_net {
bool grace_ended;
time64_t boot_time;
/* internal mount of the "nfsd" pseudofilesystem: */
struct vfsmount *nfsd_mnt;
struct dentry *nfsd_client_dir;
/*
@ -130,6 +127,9 @@ struct nfsd_net {
wait_queue_head_t ntf_wq;
atomic_t ntf_refcnt;
/* Allow umount to wait for nfsd state cleanup */
struct completion nfsd_shutdown_complete;
/*
* clientid and stateid data for construction of net unique COPY
* stateids.

8
fs/nfsd/nfs4state.c
View File

@ -7326,14 +7326,9 @@ nfs4_state_start_net(struct net *net)
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
int ret;
ret = get_nfsdfs(net);
ret = nfs4_state_create_net(net);
if (ret)
return ret;
ret = nfs4_state_create_net(net);
if (ret) {
mntput(nn->nfsd_mnt);
return ret;
}
locks_start_grace(net, &nn->nfsd4_manager);
nfsd4_client_tracking_init(net);
if (nn->track_reclaim_completes && nn->reclaim_str_hashtbl_size == 0)
@ -7403,7 +7398,6 @@ nfs4_state_shutdown_net(struct net *net)
nfsd4_client_tracking_exit(net);
nfs4_state_destroy_net(net);
mntput(nn->nfsd_mnt);
}
void

14
fs/nfsd/nfsctl.c
View File

@ -1416,6 +1416,8 @@ static void nfsd_umount(struct super_block *sb)
{
struct net *net = sb->s_fs_info;
nfsd_shutdown_threads(net);
kill_litter_super(sb);
put_net(net);
}
@ -1428,18 +1430,6 @@ static struct file_system_type nfsd_fs_type = {
};
MODULE_ALIAS_FS("nfsd");
int get_nfsdfs(struct net *net)
{
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
struct vfsmount *mnt;
mnt = vfs_kern_mount(&nfsd_fs_type, SB_KERNMOUNT, "nfsd", NULL);
if (IS_ERR(mnt))
return PTR_ERR(mnt);
nn->nfsd_mnt = mnt;
return 0;
}
#ifdef CONFIG_PROC_FS
static int create_proc_exports_entry(void)
{

3
fs/nfsd/nfsd.h
View File

@ -93,13 +93,12 @@ int nfsd_get_nrthreads(int n, int *, struct net *);
int nfsd_set_nrthreads(int n, int *, struct net *);
int nfsd_pool_stats_open(struct inode *, struct file *);
int nfsd_pool_stats_release(struct inode *, struct file *);
void nfsd_shutdown_threads(struct net *net);
void nfsd_destroy(struct net *net);
bool i_am_nfsd(void);
int get_nfsdfs(struct net *);
struct nfsdfs_client {
struct kref cl_ref;
void (*cl_release)(struct kref *kref);

35
fs/nfsd/nfssvc.c
View File

@ -596,6 +596,37 @@ static const struct svc_serv_ops nfsd_thread_sv_ops = {
.svo_module = THIS_MODULE,
};
static void nfsd_complete_shutdown(struct net *net)
{
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
WARN_ON(!mutex_is_locked(&nfsd_mutex));
nn->nfsd_serv = NULL;
complete(&nn->nfsd_shutdown_complete);
}
void nfsd_shutdown_threads(struct net *net)
{
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
struct svc_serv *serv;
mutex_lock(&nfsd_mutex);
serv = nn->nfsd_serv;
if (serv == NULL) {
mutex_unlock(&nfsd_mutex);
return;
}
svc_get(serv);
/* Kill outstanding nfsd threads */
serv->sv_ops->svo_setup(serv, NULL, 0);
nfsd_destroy(net);
mutex_unlock(&nfsd_mutex);
/* Wait for shutdown of nfsd_serv to complete */
wait_for_completion(&nn->nfsd_shutdown_complete);
}
bool i_am_nfsd(void)
{
return kthread_func(current) == nfsd;
@ -618,11 +649,13 @@ int nfsd_create_serv(struct net *net)
&nfsd_thread_sv_ops);
if (nn->nfsd_serv == NULL)
return -ENOMEM;
init_completion(&nn->nfsd_shutdown_complete);
nn->nfsd_serv->sv_maxconn = nn->max_connections;
error = svc_bind(nn->nfsd_serv, net);
if (error < 0) {
svc_destroy(nn->nfsd_serv);
nfsd_complete_shutdown(net);
return error;
}
@ -671,7 +704,7 @@ void nfsd_destroy(struct net *net)
svc_shutdown_net(nn->nfsd_serv, net);
svc_destroy(nn->nfsd_serv);
if (destroy)
nn->nfsd_serv = NULL;
nfsd_complete_shutdown(net);
}
int nfsd_set_nrthreads(int n, int *nthreads, struct net *net)