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svcrpc: fix xpt_list traversal locking on shutdown

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Server threads are not running at this point, but svc_age_temp_xprts
still may be, so we need this locking.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2012-08-13 17:03:00 -04:00
parent 21179d81f1
commit 719f8bcc88
1 changed files with 15 additions and 9 deletions
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24
net/sunrpc/svc_xprt.c
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@ -917,16 +917,18 @@ void svc_close_xprt(struct svc_xprt *xprt)
}
EXPORT_SYMBOL_GPL(svc_close_xprt);
static void svc_close_list(struct list_head *xprt_list, struct net *net)
static void svc_close_list(struct svc_serv *serv, struct list_head *xprt_list, struct net *net)
{
struct svc_xprt *xprt;
spin_lock(&serv->sv_lock);
list_for_each_entry(xprt, xprt_list, xpt_list) {
if (xprt->xpt_net != net)
continue;
set_bit(XPT_CLOSE, &xprt->xpt_flags);
set_bit(XPT_BUSY, &xprt->xpt_flags);
}
spin_unlock(&serv->sv_lock);
}
static void svc_clear_pools(struct svc_serv *serv, struct net *net)
@ -949,24 +951,28 @@ static void svc_clear_pools(struct svc_serv *serv, struct net *net)
}
}
static void svc_clear_list(struct list_head *xprt_list, struct net *net)
static void svc_clear_list(struct svc_serv *serv, struct list_head *xprt_list, struct net *net)
{
struct svc_xprt *xprt;
struct svc_xprt *tmp;
LIST_HEAD(victims);
spin_lock(&serv->sv_lock);
list_for_each_entry_safe(xprt, tmp, xprt_list, xpt_list) {
if (xprt->xpt_net != net)
continue;
svc_delete_xprt(xprt);
list_move(&xprt->xpt_list, &victims);
}
list_for_each_entry(xprt, xprt_list, xpt_list)
BUG_ON(xprt->xpt_net == net);
spin_unlock(&serv->sv_lock);
list_for_each_entry_safe(xprt, tmp, &victims, xpt_list)
svc_delete_xprt(xprt);
}
void svc_close_net(struct svc_serv *serv, struct net *net)
{
svc_close_list(&serv->sv_tempsocks, net);
svc_close_list(&serv->sv_permsocks, net);
svc_close_list(serv, &serv->sv_tempsocks, net);
svc_close_list(serv, &serv->sv_permsocks, net);
svc_clear_pools(serv, net);
/*
@ -974,8 +980,8 @@ void svc_close_net(struct svc_serv *serv, struct net *net)
* svc_xprt_enqueue will not add new entries without taking the
* sp_lock and checking XPT_BUSY.
*/
svc_clear_list(&serv->sv_tempsocks, net);
svc_clear_list(&serv->sv_permsocks, net);
svc_clear_list(serv, &serv->sv_tempsocks, net);
svc_clear_list(serv, &serv->sv_permsocks, net);
}
/*