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Revert "nfsd: separate nfsd_last_thread() from nfsd_put()"

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This reverts commit 03d68ffc48 which is
commit 9f28a971ee9fdf1bf8ce8c88b103f483be610277 upstream.

It is reported to cause issues, so revert it.

Reported-by: email200202 <email200202@yahoo.com>
Link: https://lore.kernel.org/r/e341cb408b5663d8c91b8fa57b41bb984be43448.camel@kernel.org
Cc: NeilBrown <neilb@suse.de>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2024-01-13 10:38:35 +01:00
parent db5f2f4db8
commit b2c545c398
2 changed files with 34 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
fs/nfsd/nfsd.h
View File

@ -97,12 +97,7 @@ 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);
static inline void nfsd_put(struct net *net)
{
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
svc_put(nn->nfsd_serv);
}
void nfsd_put(struct net *net);
bool i_am_nfsd(void);

52
fs/nfsd/nfssvc.c
View File

@ -523,14 +523,9 @@ static struct notifier_block nfsd_inet6addr_notifier = {
/* Only used under nfsd_mutex, so this atomic may be overkill: */
static atomic_t nfsd_notifier_refcount = ATOMIC_INIT(0);
static void nfsd_last_thread(struct net *net)
static void nfsd_last_thread(struct svc_serv *serv, struct net *net)
{
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
struct svc_serv *serv = nn->nfsd_serv;
spin_lock(&nfsd_notifier_lock);
nn->nfsd_serv = NULL;
spin_unlock(&nfsd_notifier_lock);
/* check if the notifier still has clients */
if (atomic_dec_return(&nfsd_notifier_refcount) == 0) {
@ -540,8 +535,6 @@ static void nfsd_last_thread(struct net *net)
#endif
}
svc_xprt_destroy_all(serv, net);
/*
* write_ports can create the server without actually starting
* any threads--if we get shut down before any threads are
@ -632,8 +625,7 @@ void nfsd_shutdown_threads(struct net *net)
svc_get(serv);
/* Kill outstanding nfsd threads */
svc_set_num_threads(serv, NULL, 0);
nfsd_last_thread(net);
svc_put(serv);
nfsd_put(net);
mutex_unlock(&nfsd_mutex);
}
@ -663,6 +655,9 @@ int nfsd_create_serv(struct net *net)
serv->sv_maxconn = nn->max_connections;
error = svc_bind(serv, net);
if (error < 0) {
/* NOT nfsd_put() as notifiers (see below) haven't
* been set up yet.
*/
svc_put(serv);
return error;
}
@ -705,6 +700,29 @@ int nfsd_get_nrthreads(int n, int *nthreads, struct net *net)
return 0;
}
/* This is the callback for kref_put() below.
* There is no code here as the first thing to be done is
* call svc_shutdown_net(), but we cannot get the 'net' from
* the kref. So do all the work when kref_put returns true.
*/
static void nfsd_noop(struct kref *ref)
{
}
void nfsd_put(struct net *net)
{
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
if (kref_put(&nn->nfsd_serv->sv_refcnt, nfsd_noop)) {
svc_xprt_destroy_all(nn->nfsd_serv, net);
nfsd_last_thread(nn->nfsd_serv, net);
svc_destroy(&nn->nfsd_serv->sv_refcnt);
spin_lock(&nfsd_notifier_lock);
nn->nfsd_serv = NULL;
spin_unlock(&nfsd_notifier_lock);
}
}
int nfsd_set_nrthreads(int n, int *nthreads, struct net *net)
{
int i = 0;
@ -755,7 +773,7 @@ int nfsd_set_nrthreads(int n, int *nthreads, struct net *net)
if (err)
break;
}
svc_put(nn->nfsd_serv);
nfsd_put(net);
return err;
}
@ -770,7 +788,6 @@ nfsd_svc(int nrservs, struct net *net, const struct cred *cred)
int error;
bool nfsd_up_before;
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
struct svc_serv *serv;
mutex_lock(&nfsd_mutex);
dprintk("nfsd: creating service\n");
@ -790,25 +807,22 @@ nfsd_svc(int nrservs, struct net *net, const struct cred *cred)
goto out;
nfsd_up_before = nn->nfsd_net_up;
serv = nn->nfsd_serv;
error = nfsd_startup_net(net, cred);
if (error)
goto out_put;
error = svc_set_num_threads(serv, NULL, nrservs);
error = svc_set_num_threads(nn->nfsd_serv, NULL, nrservs);
if (error)
goto out_shutdown;
error = serv->sv_nrthreads;
if (error == 0)
nfsd_last_thread(net);
error = nn->nfsd_serv->sv_nrthreads;
out_shutdown:
if (error < 0 && !nfsd_up_before)
nfsd_shutdown_net(net);
out_put:
/* Threads now hold service active */
if (xchg(&nn->keep_active, 0))
svc_put(serv);
svc_put(serv);
nfsd_put(net);
nfsd_put(net);
out:
mutex_unlock(&nfsd_mutex);
return error;