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[PATCH] knfsd: fix recently introduced problem with shutting down a busy NFS server

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When the last thread of nfsd exits, it shuts down all related sockets.  It
currently uses svc_close_socket to do this, but that only is immediately
effective if the socket is not SK_BUSY.

If the socket is busy - i.e.  if a request has arrived that has not yet been
processes - svc_close_socket is not effective and the shutdown process spins.

So create a new svc_force_close_socket which removes the SK_BUSY flag is set
and then calls svc_close_socket.

Also change some open-codes loops in svc_destroy to use
list_for_each_entry_safe.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
NeilBrown 2007-03-06 01:42:22 -08:00 committed by Linus Torvalds
parent 5a05ed73e1
commit cda1fd4abd
3 changed files with 25 additions and 14 deletions
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2
include/linux/sunrpc/svcsock.h
View file

@ -66,7 +66,7 @@ struct svc_sock {
* Function prototypes.
*/
int svc_makesock(struct svc_serv *, int, unsigned short, int flags);
void svc_close_socket(struct svc_sock *);
void svc_force_close_socket(struct svc_sock *);
int svc_recv(struct svc_rqst *, long);
int svc_send(struct svc_rqst *);
void svc_drop(struct svc_rqst *);

21
net/sunrpc/svc.c
View file

@ -367,6 +367,7 @@ void
svc_destroy(struct svc_serv *serv)
{
struct svc_sock *svsk;
struct svc_sock *tmp;
dprintk("svc: svc_destroy(%s, %d)\n",
serv->sv_program->pg_name,
@ -382,21 +383,17 @@ svc_destroy(struct svc_serv *serv)
del_timer_sync(&serv->sv_temptimer);
while (!list_empty(&serv->sv_tempsocks)) {
svsk = list_entry(serv->sv_tempsocks.next,
struct svc_sock,
sk_list);
svc_close_socket(svsk);
}
list_for_each_entry_safe(svsk, tmp, &serv->sv_tempsocks, sk_list)
svc_force_close_socket(svsk);
if (serv->sv_shutdown)
serv->sv_shutdown(serv);
while (!list_empty(&serv->sv_permsocks)) {
svsk = list_entry(serv->sv_permsocks.next,
struct svc_sock,
sk_list);
svc_close_socket(svsk);
}
list_for_each_entry_safe(svsk, tmp, &serv->sv_permsocks, sk_list)
svc_force_close_socket(svsk);
BUG_ON(!list_empty(&serv->sv_permsocks));
BUG_ON(!list_empty(&serv->sv_tempsocks));
cache_clean_deferred(serv);

16
net/sunrpc/svcsock.c
View file

@ -82,6 +82,7 @@ static void svc_delete_socket(struct svc_sock *svsk);
static void svc_udp_data_ready(struct sock *, int);
static int svc_udp_recvfrom(struct svc_rqst *);
static int svc_udp_sendto(struct svc_rqst *);
static void svc_close_socket(struct svc_sock *svsk);
static struct svc_deferred_req *svc_deferred_dequeue(struct svc_sock *svsk);
static int svc_deferred_recv(struct svc_rqst *rqstp);
@ -1787,7 +1788,7 @@ svc_delete_socket(struct svc_sock *svsk)
spin_unlock_bh(&serv->sv_lock);
}
void svc_close_socket(struct svc_sock *svsk)
static void svc_close_socket(struct svc_sock *svsk)
{
set_bit(SK_CLOSE, &svsk->sk_flags);
if (test_and_set_bit(SK_BUSY, &svsk->sk_flags))
@ -1800,6 +1801,19 @@ void svc_close_socket(struct svc_sock *svsk)
svc_sock_put(svsk);
}
void svc_force_close_socket(struct svc_sock *svsk)
{
set_bit(SK_CLOSE, &svsk->sk_flags);
if (test_bit(SK_BUSY, &svsk->sk_flags)) {
/* Waiting to be processed, but no threads left,
* So just remove it from the waiting list
*/
list_del_init(&svsk->sk_ready);
clear_bit(SK_BUSY, &svsk->sk_flags);
}
svc_close_socket(svsk);
}
/**
* svc_makesock - Make a socket for nfsd and lockd
* @serv: RPC server structure