From abd1f50094cad9dff6d68ada98b495549f52fc30 Mon Sep 17 00:00:00 2001 From: Olaf Kirch Date: Wed, 4 Oct 2006 02:16:01 -0700 Subject: [PATCH] [PATCH] knfsd: lockd: optionally use hostnames for identifying peers This patch adds the nsm_use_hostnames sysctl and module param. If set, lockd will use the client's name (as given in the NLM arguments) to find the NSM handle. This makes recovery work when the NFS peer is multi-homed, and the reboot notification arrives from a different IP than the original lock calls. Signed-off-by: Olaf Kirch Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/lockd/host.c | 6 +++++- fs/lockd/mon.c | 12 +++++++++--- fs/lockd/svc.c | 10 ++++++++++ include/linux/lockd/lockd.h | 1 + include/linux/lockd/sm_inter.h | 2 ++ 5 files changed, 27 insertions(+), 4 deletions(-) diff --git a/fs/lockd/host.c b/fs/lockd/host.c index 1bf384307d..a1423c66df 100644 --- a/fs/lockd/host.c +++ b/fs/lockd/host.c @@ -462,7 +462,11 @@ __nsm_find(const struct sockaddr_in *sin, list_for_each(pos, &nsm_handles) { nsm = list_entry(pos, struct nsm_handle, sm_link); - if (!nlm_cmp_addr(&nsm->sm_addr, sin)) + if (hostname && nsm_use_hostnames) { + if (strlen(nsm->sm_name) != hostname_len + || memcmp(nsm->sm_name, hostname, hostname_len)) + continue; + } else if (!nlm_cmp_addr(&nsm->sm_addr, sin)) continue; atomic_inc(&nsm->sm_count); goto out; diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c index 626b6c116a..709cf7c805 100644 --- a/fs/lockd/mon.c +++ b/fs/lockd/mon.c @@ -47,6 +47,7 @@ nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res) } memset(&args, 0, sizeof(args)); + args.mon_name = nsm->sm_name; args.addr = nsm->sm_addr.sin_addr.s_addr; args.prog = NLM_PROGRAM; args.vers = 3; @@ -150,7 +151,7 @@ nsm_create(void) static u32 * xdr_encode_common(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp) { - char buffer[20]; + char buffer[20], *name; /* * Use the dotted-quad IP address of the remote host as @@ -158,8 +159,13 @@ xdr_encode_common(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp) * hostname first for whatever remote hostname it receives, * so this works alright. */ - sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(argp->addr)); - if (!(p = xdr_encode_string(p, buffer)) + if (nsm_use_hostnames) { + name = argp->mon_name; + } else { + sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(argp->addr)); + name = buffer; + } + if (!(p = xdr_encode_string(p, name)) || !(p = xdr_encode_string(p, utsname()->nodename))) return ERR_PTR(-EIO); *p++ = htonl(argp->prog); diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c index 3cc369e569..a3b7602cd3 100644 --- a/fs/lockd/svc.c +++ b/fs/lockd/svc.c @@ -61,6 +61,7 @@ static DECLARE_WAIT_QUEUE_HEAD(lockd_exit); static unsigned long nlm_grace_period; static unsigned long nlm_timeout = LOCKD_DFLT_TIMEO; static int nlm_udpport, nlm_tcpport; +int nsm_use_hostnames = 0; /* * Constants needed for the sysctl interface. @@ -395,6 +396,14 @@ static ctl_table nlm_sysctls[] = { .extra1 = (int *) &nlm_port_min, .extra2 = (int *) &nlm_port_max, }, + { + .ctl_name = CTL_UNNUMBERED, + .procname = "nsm_use_hostnames", + .data = &nsm_use_hostnames, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, { .ctl_name = 0 } }; @@ -483,6 +492,7 @@ module_param_call(nlm_udpport, param_set_port, param_get_int, &nlm_udpport, 0644); module_param_call(nlm_tcpport, param_set_port, param_get_int, &nlm_tcpport, 0644); +module_param(nsm_use_hostnames, bool, 0644); /* * Initialising and terminating the module. diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h index 1fcf936d75..7be7aeaeee 100644 --- a/include/linux/lockd/lockd.h +++ b/include/linux/lockd/lockd.h @@ -142,6 +142,7 @@ extern struct svc_procedure nlmsvc_procedures4[]; #endif extern int nlmsvc_grace_period; extern unsigned long nlmsvc_timeout; +extern int nsm_use_hostnames; /* * Lockd client functions diff --git a/include/linux/lockd/sm_inter.h b/include/linux/lockd/sm_inter.h index d93b074668..daef509bb9 100644 --- a/include/linux/lockd/sm_inter.h +++ b/include/linux/lockd/sm_inter.h @@ -28,6 +28,8 @@ struct nsm_args { u32 prog; /* RPC callback info */ u32 vers; u32 proc; + + char * mon_name; }; /* -- 2.39.5