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Subject[PATCH 003 of 19] knfsd: When looking up a lockd host, pass hostname & length

From: Olaf Kirch <okir@suse.de>

This patch adds the peer's hostname (and name length) to
all calls to nlm*_lookup_host functions. A subsequent patch
will make use of these (is requested by a sysctl).

Signed-off-by: okir@suse.de
Signed-off-by: Neil Brown <neilb@suse.de>

### Diffstat output
./fs/lockd/clntproc.c | 5 ++++-
./fs/lockd/host.c | 37 +++++++++++++++++++++++++------------
./fs/lockd/svc4proc.c | 6 ++++--
./fs/lockd/svclock.c | 3 ++-
./fs/lockd/svcproc.c | 6 ++++--
./include/linux/lockd/lockd.h | 6 +++---
6 files changed, 42 insertions(+), 21 deletions(-)

diff .prev/fs/lockd/clntproc.c ./fs/lockd/clntproc.c
--- .prev/fs/lockd/clntproc.c 2006-08-31 16:59:10.000000000 +1000
+++ ./fs/lockd/clntproc.c 2006-08-31 16:32:15.000000000 +1000
@@ -153,6 +153,7 @@ nlmclnt_proc(struct inode *inode, int cm
{
struct rpc_clnt *client = NFS_CLIENT(inode);
struct sockaddr_in addr;
+ struct nfs_server *nfssrv = NFS_SERVER(inode);
struct nlm_host *host;
struct nlm_rqst *call;
sigset_t oldset;
@@ -166,7 +167,9 @@ nlmclnt_proc(struct inode *inode, int cm
}

rpc_peeraddr(client, (struct sockaddr *) &addr, sizeof(addr));
- host = nlmclnt_lookup_host(&addr, client->cl_xprt->prot, vers);
+ host = nlmclnt_lookup_host(&addr, client->cl_xprt->prot, vers,
+ nfssrv->nfs_client->cl_hostname,
+ strlen(nfssrv->nfs_client->cl_hostname));
if (host == NULL)
return -ENOLCK;

diff .prev/fs/lockd/host.c ./fs/lockd/host.c
--- .prev/fs/lockd/host.c 2006-08-31 16:59:10.000000000 +1000
+++ ./fs/lockd/host.c 2006-08-31 16:23:12.000000000 +1000
@@ -39,19 +39,23 @@ static void nlm_gc_hosts(void);
* Find an NLM server handle in the cache. If there is none, create it.
*/
struct nlm_host *
-nlmclnt_lookup_host(const struct sockaddr_in *sin, int proto, int version)
+nlmclnt_lookup_host(const struct sockaddr_in *sin, int proto, int version,
+ const char *hostname, int hostname_len)
{
- return nlm_lookup_host(0, sin, proto, version);
+ return nlm_lookup_host(0, sin, proto, version,
+ hostname, hostname_len);
}

/*
* Find an NLM client handle in the cache. If there is none, create it.
*/
struct nlm_host *
-nlmsvc_lookup_host(struct svc_rqst *rqstp)
+nlmsvc_lookup_host(struct svc_rqst *rqstp,
+ const char *hostname, int hostname_len)
{
return nlm_lookup_host(1, &rqstp->rq_addr,
- rqstp->rq_prot, rqstp->rq_vers);
+ rqstp->rq_prot, rqstp->rq_vers,
+ hostname, hostname_len);
}

/*
@@ -59,14 +63,20 @@ nlmsvc_lookup_host(struct svc_rqst *rqst
*/
struct nlm_host *
nlm_lookup_host(int server, const struct sockaddr_in *sin,
- int proto, int version)
+ int proto, int version,
+ const char *hostname,
+ int hostname_len)
{
struct nlm_host *host, **hp;
u32 addr;
int hash;

- dprintk("lockd: nlm_lookup_host(%08x, p=%d, v=%d)\n",
- (unsigned)(sin? ntohl(sin->sin_addr.s_addr) : 0), proto, version);
+ dprintk("lockd: nlm_lookup_host(%u.%u.%u.%u, p=%d, v=%d, my role=%s, name=%.*s)\n",
+ NIPQUAD(sin->sin_addr.s_addr), proto, version,
+ server? "server" : "client",
+ hostname_len,
+ hostname? hostname : "<none>");
+

hash = NLM_ADDRHASH(sin->sin_addr.s_addr);

@@ -267,19 +277,22 @@ void nlm_release_host(struct nlm_host *h
void nlm_host_rebooted(const struct sockaddr_in *sin, const struct nlm_reboot *argp)
{
struct nlm_host *host;
+ int server;

/* Obtain the host pointer for this NFS server and try to
* reclaim all locks we hold on this server.
*/
- if ((argp->proto & 1)==0) {
+ server = (argp->proto & 1)? 1 : 0;
+ host = nlm_lookup_host(server, sin, argp->proto >> 1, argp->vers,
+ argp->mon, argp->len);
+ if (host == NULL)
+ return;
+
+ if (server == 0) {
/* We are client, he's the server: try to reclaim all locks. */
- if ((host = nlmclnt_lookup_host(sin, argp->proto >> 1, argp->vers)) == NULL)
- return;
nlmclnt_recovery(host, argp->state);
} else {
/* He's the client, we're the server: delete all locks held by the client */
- if ((host = nlm_lookup_host(1, sin, argp->proto >> 1, argp->vers)) == NULL)
- return;
nlmsvc_free_host_resources(host);
}
nlm_release_host(host);
diff .prev/fs/lockd/svc4proc.c ./fs/lockd/svc4proc.c
--- .prev/fs/lockd/svc4proc.c 2006-08-31 16:59:10.000000000 +1000
+++ ./fs/lockd/svc4proc.c 2006-08-31 16:59:53.000000000 +1000
@@ -38,7 +38,7 @@ nlm4svc_retrieve_args(struct svc_rqst *r
return nlm_lck_denied_nolocks;

/* Obtain host handle */
- if (!(host = nlmsvc_lookup_host(rqstp))
+ if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
|| (argp->monitor && nsm_monitor(host) < 0))
goto no_locks;
*hostp = host;
@@ -260,7 +260,9 @@ static int nlm4svc_callback(struct svc_r
struct nlm_rqst *call;
int stat;

- host = nlmsvc_lookup_host(rqstp);
+ host = nlmsvc_lookup_host(rqstp,
+ argp->lock.caller,
+ argp->lock.len);
if (host == NULL)
return rpc_system_err;

diff .prev/fs/lockd/svclock.c ./fs/lockd/svclock.c
--- .prev/fs/lockd/svclock.c 2006-08-31 16:59:10.000000000 +1000
+++ ./fs/lockd/svclock.c 2006-08-31 16:23:12.000000000 +1000
@@ -179,7 +179,7 @@ nlmsvc_create_block(struct svc_rqst *rqs
struct nlm_rqst *call = NULL;

/* Create host handle for callback */
- host = nlmsvc_lookup_host(rqstp);
+ host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len);
if (host == NULL)
return NULL;

@@ -451,6 +451,7 @@ nlmsvc_testlock(struct nlm_file *file, s
(long long)conflock->fl.fl_start,
(long long)conflock->fl.fl_end);
conflock->caller = "somehost"; /* FIXME */
+ conflock->len = strlen(conflock->caller);
conflock->oh.len = 0; /* don't return OH info */
conflock->svid = conflock->fl.fl_pid;
return nlm_lck_denied;
diff .prev/fs/lockd/svcproc.c ./fs/lockd/svcproc.c
--- .prev/fs/lockd/svcproc.c 2006-08-31 16:59:10.000000000 +1000
+++ ./fs/lockd/svcproc.c 2006-08-31 16:59:39.000000000 +1000
@@ -66,7 +66,7 @@ nlmsvc_retrieve_args(struct svc_rqst *rq
return nlm_lck_denied_nolocks;

/* Obtain host handle */
- if (!(host = nlmsvc_lookup_host(rqstp))
+ if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
|| (argp->monitor && nsm_monitor(host) < 0))
goto no_locks;
*hostp = host;
@@ -287,7 +287,9 @@ static int nlmsvc_callback(struct svc_rq
struct nlm_rqst *call;
int stat;

- host = nlmsvc_lookup_host(rqstp);
+ host = nlmsvc_lookup_host(rqstp,
+ argp->lock.caller,
+ argp->lock.len);
if (host == NULL)
return rpc_system_err;

diff .prev/include/linux/lockd/lockd.h ./include/linux/lockd/lockd.h
--- .prev/include/linux/lockd/lockd.h 2006-08-31 16:59:10.000000000 +1000
+++ ./include/linux/lockd/lockd.h 2006-08-31 16:23:12.000000000 +1000
@@ -161,9 +161,9 @@ int nlmclnt_reclaim(struct nlm_host *
/*
* Host cache
*/
-struct nlm_host * nlmclnt_lookup_host(const struct sockaddr_in *, int, int);
-struct nlm_host * nlmsvc_lookup_host(struct svc_rqst *);
-struct nlm_host * nlm_lookup_host(int server, const struct sockaddr_in *, int, int);
+struct nlm_host * nlmclnt_lookup_host(const struct sockaddr_in *, int, int, const char *, int);
+struct nlm_host * nlmsvc_lookup_host(struct svc_rqst *, const char *, int);
+struct nlm_host * nlm_lookup_host(int server, const struct sockaddr_in *, int, int, const char *, int);
struct rpc_clnt * nlm_bind_host(struct nlm_host *);
void nlm_rebind_host(struct nlm_host *);
struct nlm_host * nlm_get_host(struct nlm_host *);
-
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