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NLM: Convert nlm_lookup_host() to use a single argument
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The nlm_lookup_host() function already has a large number of arguments,
and I'm about to add a few more.  As a clean up, convert the function
to use a single data structure argument.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
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Chuck Lever authored and J. Bruce Fields committed Oct 3, 2008
1 parent d22b1cf commit 7f1ed18
Showing 1 changed file with 56 additions and 30 deletions.
86 changes: 56 additions & 30 deletions fs/lockd/host.c
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,17 @@ static struct nsm_handle *nsm_find(const struct sockaddr *sap,
const size_t hostname_len,
const int create);

struct nlm_lookup_host_info {
const int server; /* search for server|client */
const struct sockaddr_in *sin; /* address to search for */
const unsigned short protocol; /* transport to search for*/
const u32 version; /* NLM version to search for */
const char *hostname; /* remote's hostname */
const size_t hostname_len; /* it's length */
const struct sockaddr_in *src_sin; /* our address (optional) */
const size_t src_len; /* it's length */
};

/*
* Hash function must work well on big- and little-endian platforms
*/
Expand Down Expand Up @@ -121,23 +132,13 @@ static void nlm_display_address(const struct sockaddr *sap,
/*
* Common host lookup routine for server & client
*/
static struct nlm_host *nlm_lookup_host(int server,
const struct sockaddr_in *sin,
int proto, u32 version,
const char *hostname,
unsigned int hostname_len,
const struct sockaddr_in *ssin)
static struct nlm_host *nlm_lookup_host(struct nlm_lookup_host_info *ni)
{
struct hlist_head *chain;
struct hlist_node *pos;
struct nlm_host *host;
struct nsm_handle *nsm = NULL;

dprintk("lockd: nlm_lookup_host(proto=%d, vers=%u,"
" my role is %s, hostname=%.*s)\n",
proto, version, server ? "server" : "client",
hostname_len, hostname ? hostname : "<none>");

mutex_lock(&nlm_host_mutex);

if (time_after_eq(jiffies, next_gc))
Expand All @@ -150,22 +151,23 @@ static struct nlm_host *nlm_lookup_host(int server,
* different NLM rpc_clients into one single nlm_host object.
* This would allow us to have one nlm_host per address.
*/
chain = &nlm_hosts[nlm_hash_address((struct sockaddr *)sin)];
chain = &nlm_hosts[nlm_hash_address((struct sockaddr *)ni->sin)];
hlist_for_each_entry(host, pos, chain, h_hash) {
if (!nlm_cmp_addr(nlm_addr(host), (struct sockaddr *)sin))
if (!nlm_cmp_addr(nlm_addr(host), (struct sockaddr *)ni->sin))
continue;

/* See if we have an NSM handle for this client */
if (!nsm)
nsm = host->h_nsmhandle;

if (host->h_proto != proto)
if (host->h_proto != ni->protocol)
continue;
if (host->h_version != version)
if (host->h_version != ni->version)
continue;
if (host->h_server != server)
if (host->h_server != ni->server)
continue;
if (!nlm_cmp_addr(nlm_srcaddr(host), (struct sockaddr *)ssin))
if (!nlm_cmp_addr(nlm_srcaddr(host),
(struct sockaddr *)ni->src_sin))
continue;

/* Move to head of hash chain. */
Expand All @@ -186,8 +188,9 @@ static struct nlm_host *nlm_lookup_host(int server,
atomic_inc(&nsm->sm_count);
else {
host = NULL;
nsm = nsm_find((struct sockaddr *)sin, sizeof(*sin),
hostname, hostname_len, 1);
nsm = nsm_find((struct sockaddr *)ni->sin,
sizeof(struct sockaddr_in),
ni->hostname, ni->hostname_len, 1);
if (!nsm) {
dprintk("lockd: nlm_lookup_host failed; "
"no nsm handle\n");
Expand All @@ -202,12 +205,12 @@ static struct nlm_host *nlm_lookup_host(int server,
goto out;
}
host->h_name = nsm->sm_name;
memcpy(nlm_addr(host), sin, sizeof(*sin));
host->h_addrlen = sizeof(*sin);
memcpy(nlm_addr(host), ni->sin, sizeof(struct sockaddr_in));
host->h_addrlen = sizeof(struct sockaddr_in);
nlm_clear_port(nlm_addr(host));
memcpy(nlm_srcaddr(host), ssin, sizeof(*ssin));
host->h_version = version;
host->h_proto = proto;
memcpy(nlm_srcaddr(host), ni->src_sin, sizeof(struct sockaddr_in));
host->h_version = ni->version;
host->h_proto = ni->protocol;
host->h_rpcclnt = NULL;
mutex_init(&host->h_mutex);
host->h_nextrebind = jiffies + NLM_HOST_REBIND;
Expand All @@ -218,7 +221,7 @@ static struct nlm_host *nlm_lookup_host(int server,
host->h_state = 0; /* pseudo NSM state */
host->h_nsmstate = 0; /* real NSM state */
host->h_nsmhandle = nsm;
host->h_server = server;
host->h_server = ni->server;
hlist_add_head(&host->h_hash, chain);
INIT_LIST_HEAD(&host->h_lockowners);
spin_lock_init(&host->h_lock);
Expand Down Expand Up @@ -273,9 +276,21 @@ struct nlm_host *nlmclnt_lookup_host(const struct sockaddr_in *sin,
const struct sockaddr_in source = {
.sin_family = AF_UNSPEC,
};
struct nlm_lookup_host_info ni = {
.server = 0,
.sin = sin,
.protocol = proto,
.version = version,
.hostname = hostname,
.hostname_len = hostname_len,
.src_sin = &source,
};

return nlm_lookup_host(0, sin, proto, version,
hostname, hostname_len, &source);
dprintk("lockd: %s(host='%s', vers=%u, proto=%s)\n", __func__,
(hostname ? hostname : "<none>"), version,
(proto == IPPROTO_UDP ? "udp" : "tcp"));

return nlm_lookup_host(&ni);
}

/*
Expand All @@ -289,10 +304,21 @@ nlmsvc_lookup_host(struct svc_rqst *rqstp,
.sin_family = AF_INET,
.sin_addr = rqstp->rq_daddr.addr,
};
struct nlm_lookup_host_info ni = {
.server = 1,
.sin = svc_addr_in(rqstp),
.protocol = rqstp->rq_prot,
.version = rqstp->rq_vers,
.hostname = hostname,
.hostname_len = hostname_len,
.src_sin = &source,
};

dprintk("lockd: %s(host='%*s', vers=%u, proto=%s)\n", __func__,
(int)hostname_len, hostname, rqstp->rq_vers,
(rqstp->rq_prot == IPPROTO_UDP ? "udp" : "tcp"));

return nlm_lookup_host(1, svc_addr_in(rqstp),
rqstp->rq_prot, rqstp->rq_vers,
hostname, hostname_len, &source);
return nlm_lookup_host(&ni);
}

/*
Expand Down

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