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Fix a timeout deadlock that can occur when the process holding the

Browse Source 
receive lock hasn't yet managed to send its own request.

PR:		kern/15055
Submitted by:	Ian Dowse iedowse@maths.tcd.ie
This commit is contained in:
Matthew Dillon 1999-12-13 04:24:55 +00:00
parent 5f070b6772
commit 4682c8eac9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=54536
3 changed files with 72 additions and 12 deletions
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28
sys/nfs/nfs_socket.c
View File

@ -152,6 +152,7 @@ static void nfs_rcvunlock __P((struct nfsreq *));
static void nfs_realign __P((struct mbuf **pm, int hsiz));
static int nfs_receive __P((struct nfsreq *rep, struct sockaddr **aname,
struct mbuf **mp));
static void nfs_softterm __P((struct nfsreq *rep));
static int nfs_reconnect __P((struct nfsreq *rep));
#ifndef NFS_NOSERVER
static int nfsrv_getstream __P((struct nfssvc_sock *,int));
@ -864,8 +865,10 @@ nfs_reply(myrep)
if (nmp->nm_cwnd > NFS_MAXCWND)
nmp->nm_cwnd = NFS_MAXCWND;
}
rep->r_flags &= ~R_SENT;
nmp->nm_sent -= NFS_CWNDSCALE;
if (rep->r_flags & R_SENT) {
rep->r_flags &= ~R_SENT;
nmp->nm_sent -= NFS_CWNDSCALE;
}
/*
* Update rtt using a gain of 0.125 on the mean
* and a gain of 0.25 on the deviation.
@ -1384,7 +1387,7 @@ nfs_timer(arg)
if (rep->r_mrep || (rep->r_flags & R_SOFTTERM))
continue;
if (nfs_sigintr(nmp, rep, rep->r_procp)) {
rep->r_flags |= R_SOFTTERM;
nfs_softterm(rep);
continue;
}
if (rep->r_rtt >= 0) {
@ -1412,7 +1415,7 @@ nfs_timer(arg)
}
if (rep->r_rexmit >= rep->r_retry) { /* too many */
nfsstats.rpctimeouts++;
rep->r_flags |= R_SOFTTERM;
nfs_softterm(rep);
continue;
}
if (nmp->nm_sotype != SOCK_DGRAM) {
@ -1491,6 +1494,23 @@ nfs_timer(arg)
nfs_timer_handle = timeout(nfs_timer, (void *)0, nfs_ticks);
}
/*
* Flag a request as being about to terminate (due to NFSMNT_INT/NFSMNT_SOFT).
* The nm_send count is decremented now to avoid deadlocks when the process in
* soreceive() hasn't yet managed to send its own request.
*/
static void
nfs_softterm(rep)
struct nfsreq *rep;
{
rep->r_flags |= R_SOFTTERM;
if (rep->r_flags & R_SENT) {
rep->r_nmp->nm_sent -= NFS_CWNDSCALE;
rep->r_flags &= ~R_SENT;
}
}
/*
* Test for a termination condition pending on the process.

28
sys/nfsclient/nfs_socket.c
View File

@ -152,6 +152,7 @@ static void nfs_rcvunlock __P((struct nfsreq *));
static void nfs_realign __P((struct mbuf **pm, int hsiz));
static int nfs_receive __P((struct nfsreq *rep, struct sockaddr **aname,
struct mbuf **mp));
static void nfs_softterm __P((struct nfsreq *rep));
static int nfs_reconnect __P((struct nfsreq *rep));
#ifndef NFS_NOSERVER
static int nfsrv_getstream __P((struct nfssvc_sock *,int));
@ -864,8 +865,10 @@ nfs_reply(myrep)
if (nmp->nm_cwnd > NFS_MAXCWND)
nmp->nm_cwnd = NFS_MAXCWND;
}
rep->r_flags &= ~R_SENT;
nmp->nm_sent -= NFS_CWNDSCALE;
if (rep->r_flags & R_SENT) {
rep->r_flags &= ~R_SENT;
nmp->nm_sent -= NFS_CWNDSCALE;
}
/*
* Update rtt using a gain of 0.125 on the mean
* and a gain of 0.25 on the deviation.
@ -1384,7 +1387,7 @@ nfs_timer(arg)
if (rep->r_mrep || (rep->r_flags & R_SOFTTERM))
continue;
if (nfs_sigintr(nmp, rep, rep->r_procp)) {
rep->r_flags |= R_SOFTTERM;
nfs_softterm(rep);
continue;
}
if (rep->r_rtt >= 0) {
@ -1412,7 +1415,7 @@ nfs_timer(arg)
}
if (rep->r_rexmit >= rep->r_retry) { /* too many */
nfsstats.rpctimeouts++;
rep->r_flags |= R_SOFTTERM;
nfs_softterm(rep);
continue;
}
if (nmp->nm_sotype != SOCK_DGRAM) {
@ -1491,6 +1494,23 @@ nfs_timer(arg)
nfs_timer_handle = timeout(nfs_timer, (void *)0, nfs_ticks);
}
/*
* Flag a request as being about to terminate (due to NFSMNT_INT/NFSMNT_SOFT).
* The nm_send count is decremented now to avoid deadlocks when the process in
* soreceive() hasn't yet managed to send its own request.
*/
static void
nfs_softterm(rep)
struct nfsreq *rep;
{
rep->r_flags |= R_SOFTTERM;
if (rep->r_flags & R_SENT) {
rep->r_nmp->nm_sent -= NFS_CWNDSCALE;
rep->r_flags &= ~R_SENT;
}
}
/*
* Test for a termination condition pending on the process.

28
sys/nfsserver/nfs_srvsock.c
View File

@ -152,6 +152,7 @@ static void nfs_rcvunlock __P((struct nfsreq *));
static void nfs_realign __P((struct mbuf **pm, int hsiz));
static int nfs_receive __P((struct nfsreq *rep, struct sockaddr **aname,
struct mbuf **mp));
static void nfs_softterm __P((struct nfsreq *rep));
static int nfs_reconnect __P((struct nfsreq *rep));
#ifndef NFS_NOSERVER
static int nfsrv_getstream __P((struct nfssvc_sock *,int));
@ -864,8 +865,10 @@ nfs_reply(myrep)
if (nmp->nm_cwnd > NFS_MAXCWND)
nmp->nm_cwnd = NFS_MAXCWND;
}
rep->r_flags &= ~R_SENT;
nmp->nm_sent -= NFS_CWNDSCALE;
if (rep->r_flags & R_SENT) {
rep->r_flags &= ~R_SENT;
nmp->nm_sent -= NFS_CWNDSCALE;
}
/*
* Update rtt using a gain of 0.125 on the mean
* and a gain of 0.25 on the deviation.
@ -1384,7 +1387,7 @@ nfs_timer(arg)
if (rep->r_mrep || (rep->r_flags & R_SOFTTERM))
continue;
if (nfs_sigintr(nmp, rep, rep->r_procp)) {
rep->r_flags |= R_SOFTTERM;
nfs_softterm(rep);
continue;
}
if (rep->r_rtt >= 0) {
@ -1412,7 +1415,7 @@ nfs_timer(arg)
}
if (rep->r_rexmit >= rep->r_retry) { /* too many */
nfsstats.rpctimeouts++;
rep->r_flags |= R_SOFTTERM;
nfs_softterm(rep);
continue;
}
if (nmp->nm_sotype != SOCK_DGRAM) {
@ -1491,6 +1494,23 @@ nfs_timer(arg)
nfs_timer_handle = timeout(nfs_timer, (void *)0, nfs_ticks);
}
/*
* Flag a request as being about to terminate (due to NFSMNT_INT/NFSMNT_SOFT).
* The nm_send count is decremented now to avoid deadlocks when the process in
* soreceive() hasn't yet managed to send its own request.
*/
static void
nfs_softterm(rep)
struct nfsreq *rep;
{
rep->r_flags |= R_SOFTTERM;
if (rep->r_flags & R_SENT) {
rep->r_nmp->nm_sent -= NFS_CWNDSCALE;
rep->r_flags &= ~R_SENT;
}
}
/*
* Test for a termination condition pending on the process.