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This patch is believed to fix a problem in the kernel rpc for

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non-interruptible NFS mounts, where a kernel thread will seem
to be stuck sleeping on "rpccon". The msleep() in clnt_vc_create()
that was waiting to a TCP connect to complete would return ERESTART,
since PCATCH was specified. Then the tsleep() in clnt_reconnect_call()
would sleep for 1 second and then try again and again and...
The patch changes the msleep() in clnt_vc_create() so it only sets
the PCATCH flag for interruptible cases.

Tested by:	pho
Reviewed by:	jhb
MFC after:	2 weeks
This commit is contained in:
Rick Macklem 2011-04-27 18:19:26 +00:00
parent 4d2ede6798
commit 7b67bd9f3d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=221127
4 changed files with 11 additions and 6 deletions
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3
sys/rpc/clnt.h
View File

@ -433,10 +433,11 @@ extern CLIENT *clnt_dg_create(struct socket *so,
* rpcvers_t vers; -- version number
* size_t sendsz; -- buffer recv size
* size_t recvsz; -- buffer send size
* int intrflag; -- is it interruptible
*/
extern CLIENT *clnt_vc_create(struct socket *so,
struct sockaddr *svcaddr, rpcprog_t program, rpcvers_t version,
size_t sendsz, size_t recvsz);
size_t sendsz, size_t recvsz, int intrflag);
/*
* struct netconfig *nconf; -- network type

2
sys/rpc/clnt_rc.c
View File

@ -195,7 +195,7 @@ clnt_reconnect_connect(CLIENT *cl)
else
newclient = clnt_vc_create(so,
(struct sockaddr *) &rc->rc_addr, rc->rc_prog, rc->rc_vers,
rc->rc_sendsz, rc->rc_recvsz);
rc->rc_sendsz, rc->rc_recvsz, rc->rc_intr);
td->td_ucred = oldcred;
if (!newclient) {

10
sys/rpc/clnt_vc.c
View File

@ -168,7 +168,8 @@ clnt_vc_create(
const rpcprog_t prog, /* program number */
const rpcvers_t vers, /* version number */
size_t sendsz, /* buffer recv size */
size_t recvsz) /* buffer send size */
size_t recvsz, /* buffer send size */
int intrflag) /* interruptible */
{
CLIENT *cl; /* client handle */
struct ct_data *ct = NULL; /* client handle */
@ -177,7 +178,7 @@ clnt_vc_create(
static uint32_t disrupt;
struct __rpc_sockinfo si;
XDR xdrs;
int error, interrupted, one = 1;
int error, interrupted, one = 1, sleep_flag;
struct sockopt sopt;
if (disrupt == 0)
@ -196,10 +197,13 @@ clnt_vc_create(
error = soconnect(so, raddr, curthread);
SOCK_LOCK(so);
interrupted = 0;
sleep_flag = PSOCK;
if (intrflag != 0)
sleep_flag |= (PCATCH | PBDRY);
while ((so->so_state & SS_ISCONNECTING)
&& so->so_error == 0) {
error = msleep(&so->so_timeo, SOCK_MTX(so),
PSOCK | PCATCH | PBDRY, "connec", 0);
sleep_flag, "connec", 0);
if (error) {
if (error == EINTR || error == ERESTART)
interrupted = 1;

2
sys/rpc/rpcb_clnt.c
View File

@ -477,7 +477,7 @@ local_rpcb()
tsize = __rpc_get_t_size(AF_LOCAL, 0, 0);
client = clnt_vc_create(so, (struct sockaddr *)&sun, (rpcprog_t)RPCBPROG,
(rpcvers_t)RPCBVERS, tsize, tsize);
(rpcvers_t)RPCBVERS, tsize, tsize, 1);
if (client != NULL) {
/* Mark the socket to be closed in destructor */