On Thu, Aug 16, 2012 at 03:29:03PM -0400, J. Bruce Fields wrote:
> Looking back at this:
>
> - adding the sv_lock looks like the right thing to do anyway
> independent of containers, because svc_age_temp_xprts may
> still be running.
This is what I've been testing with.
Or alternatively if you'd rather strip out the other stuff from your
patch I could take that instead.
--b.
commit 719f8bcc883e7992615f4d5625922e24995e2d98
Author: J. Bruce Fields <bfie...@redhat.com>
Date: Mon Aug 13 17:03:00 2012 -0400
svcrpc: fix xpt_list traversal locking on shutdown
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 <bfie...@redhat.com>
diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index bac973a..e1810b9 100644
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -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);
}
/*
--
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