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SUNRPC: move per-net operations from svc_destroy() 

The idea is to separate service destruction and per-net operations,
because these are two different things and the mix looks ugly.

Notes:

1) For NFS server this patch looks ugly (sorry for that). But these
place will be rewritten soon during NFSd containerization.

2) LockD per-net counter increase int lockd_up() was moved prior to
make_socks() to make lockd_down_net() call safe in case of error.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Stanislav Kinsbursky 2012-05-04 12:49:41 +04:00 committed by J. Bruce Fields
parent 9793f7c889
commit 786185b5f8
5 changed files with 41 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
fs/lockd/svc.c
View File

@ -257,7 +257,7 @@ static int lockd_up_net(struct net *net)
struct svc_serv *serv = nlmsvc_rqst->rq_server;
int error;
if (ln->nlmsvc_users)
if (ln->nlmsvc_users++)
return 0;
error = svc_rpcb_setup(serv, net);
@ -272,6 +272,7 @@ static int lockd_up_net(struct net *net)
err_socks:
svc_rpcb_cleanup(serv, net);
err_rpcb:
ln->nlmsvc_users--;
return error;
}
@ -299,6 +300,7 @@ int lockd_up(struct net *net)
{
struct svc_serv *serv;
int error = 0;
struct lockd_net *ln = net_generic(net, lockd_net_id);
mutex_lock(&nlmsvc_mutex);
/*
@ -330,9 +332,11 @@ int lockd_up(struct net *net)
goto destroy_and_out;
}
ln->nlmsvc_users++;
error = make_socks(serv, net);
if (error < 0)
goto destroy_and_out;
goto err_start;
/*
* Create the kernel thread and wait for it to start.
@ -344,7 +348,7 @@ int lockd_up(struct net *net)
printk(KERN_WARNING
"lockd_up: svc_rqst allocation failed, error=%d\n",
error);
goto destroy_and_out;
goto err_start;
}
svc_sock_update_bufs(serv);
@ -358,7 +362,7 @@ int lockd_up(struct net *net)
nlmsvc_rqst = NULL;
printk(KERN_WARNING
"lockd_up: kthread_run failed, error=%d\n", error);
goto destroy_and_out;
goto err_start;
}
/*
@ -368,14 +372,14 @@ int lockd_up(struct net *net)
destroy_and_out:
svc_destroy(serv);
out:
if (!error) {
struct lockd_net *ln = net_generic(net, lockd_net_id);
ln->nlmsvc_users++;
if (!error)
nlmsvc_users++;
}
mutex_unlock(&nlmsvc_mutex);
return error;
err_start:
lockd_down_net(net);
goto destroy_and_out;
}
EXPORT_SYMBOL_GPL(lockd_up);
@ -386,11 +390,10 @@ void
lockd_down(struct net *net)
{
mutex_lock(&nlmsvc_mutex);
lockd_down_net(net);
if (nlmsvc_users) {
if (--nlmsvc_users) {
lockd_down_net(net);
if (--nlmsvc_users)
goto out;
}
} else {
printk(KERN_ERR "lockd_down: no users! task=%p\n",
nlmsvc_task);

3
fs/nfs/callback.c
View File

@ -314,6 +314,8 @@ out_err:
dprintk("NFS: Couldn't create callback socket or server thread; "
"err = %d\n", ret);
cb_info->users--;
if (serv)
svc_shutdown_net(serv, net);
goto out;
}
@ -328,6 +330,7 @@ void nfs_callback_down(int minorversion)
cb_info->users--;
if (cb_info->users == 0 && cb_info->task != NULL) {
kthread_stop(cb_info->task);
svc_shutdown_net(cb_info->serv, current->nsproxy->net_ns);
svc_exit_thread(cb_info->rqst);
cb_info->serv = NULL;
cb_info->rqst = NULL;

12
fs/nfsd/nfsctl.c
View File

@ -661,6 +661,7 @@ static ssize_t __write_ports_addfd(char *buf)
{
char *mesg = buf;
int fd, err;
struct net *net = &init_net;
err = get_int(&mesg, &fd);
if (err != 0 || fd < 0)
@ -672,6 +673,8 @@ static ssize_t __write_ports_addfd(char *buf)
err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
if (err < 0) {
if (nfsd_serv->sv_nrthreads == 1)
svc_shutdown_net(nfsd_serv, net);
svc_destroy(nfsd_serv);
return err;
}
@ -709,6 +712,7 @@ static ssize_t __write_ports_addxprt(char *buf)
char transport[16];
struct svc_xprt *xprt;
int port, err;
struct net *net = &init_net;
if (sscanf(buf, "%15s %4u", transport, &port) != 2)
return -EINVAL;
@ -720,12 +724,12 @@ static ssize_t __write_ports_addxprt(char *buf)
if (err != 0)
return err;
err = svc_create_xprt(nfsd_serv, transport, &init_net,
err = svc_create_xprt(nfsd_serv, transport, net,
PF_INET, port, SVC_SOCK_ANONYMOUS);
if (err < 0)
goto out_err;
err = svc_create_xprt(nfsd_serv, transport, &init_net,
err = svc_create_xprt(nfsd_serv, transport, net,
PF_INET6, port, SVC_SOCK_ANONYMOUS);
if (err < 0 && err != -EAFNOSUPPORT)
goto out_close;
@ -734,12 +738,14 @@ static ssize_t __write_ports_addxprt(char *buf)
nfsd_serv->sv_nrthreads--;
return 0;
out_close:
xprt = svc_find_xprt(nfsd_serv, transport, &init_net, PF_INET, port);
xprt = svc_find_xprt(nfsd_serv, transport, net, PF_INET, port);
if (xprt != NULL) {
svc_close_xprt(xprt);
svc_xprt_put(xprt);
}
out_err:
if (nfsd_serv->sv_nrthreads == 1)
svc_shutdown_net(nfsd_serv, net);
svc_destroy(nfsd_serv);
return err;
}

14
fs/nfsd/nfssvc.c
View File

@ -382,6 +382,7 @@ int nfsd_set_nrthreads(int n, int *nthreads)
int i = 0;
int tot = 0;
int err = 0;
struct net *net = &init_net;
WARN_ON(!mutex_is_locked(&nfsd_mutex));
@ -426,6 +427,9 @@ int nfsd_set_nrthreads(int n, int *nthreads)
if (err)
break;
}
if (nfsd_serv->sv_nrthreads == 1)
svc_shutdown_net(nfsd_serv, net);
svc_destroy(nfsd_serv);
return err;
@ -441,6 +445,7 @@ nfsd_svc(unsigned short port, int nrservs)
{
int error;
bool nfsd_up_before;
struct net *net = &init_net;
mutex_lock(&nfsd_mutex);
dprintk("nfsd: creating service\n");
@ -473,6 +478,8 @@ out_shutdown:
if (error < 0 && !nfsd_up_before)
nfsd_shutdown();
out_destroy:
if (nfsd_serv->sv_nrthreads == 1)
svc_shutdown_net(nfsd_serv, net);
svc_destroy(nfsd_serv); /* Release server */
out:
mutex_unlock(&nfsd_mutex);
@ -556,6 +563,9 @@ nfsd(void *vrqstp)
nfsdstats.th_cnt --;
out:
if (rqstp->rq_server->sv_nrthreads == 1)
svc_shutdown_net(rqstp->rq_server, &init_net);
/* Release the thread */
svc_exit_thread(rqstp);
@ -668,8 +678,12 @@ int nfsd_pool_stats_open(struct inode *inode, struct file *file)
int nfsd_pool_stats_release(struct inode *inode, struct file *file)
{
int ret = seq_release(inode, file);
struct net *net = &init_net;
mutex_lock(&nfsd_mutex);
/* this function really, really should have been called svc_put() */
if (nfsd_serv->sv_nrthreads == 1)
svc_shutdown_net(nfsd_serv, net);
svc_destroy(nfsd_serv);
mutex_unlock(&nfsd_mutex);
return ret;

4
net/sunrpc/svc.c
View File

@ -537,8 +537,6 @@ EXPORT_SYMBOL_GPL(svc_shutdown_net);
void
svc_destroy(struct svc_serv *serv)
{
struct net *net = current->nsproxy->net_ns;
dprintk("svc: svc_destroy(%s, %d)\n",
serv->sv_program->pg_name,
serv->sv_nrthreads);
@ -553,8 +551,6 @@ svc_destroy(struct svc_serv *serv)
del_timer_sync(&serv->sv_temptimer);
svc_shutdown_net(serv, net);
/*
* The last user is gone and thus all sockets have to be destroyed to
* the point. Check this.