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-rw-r--r--fs/lockd/mon.c228
1 files changed, 128 insertions, 100 deletions
diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c
index f956651d0f6..1812f026960 100644
--- a/fs/lockd/mon.c
+++ b/fs/lockd/mon.c
@@ -7,17 +7,20 @@
*/
#include <linux/types.h>
-#include <linux/utsname.h>
#include <linux/kernel.h>
#include <linux/ktime.h>
+#include <linux/slab.h>
#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/addr.h>
#include <linux/sunrpc/xprtsock.h>
#include <linux/sunrpc/svc.h>
#include <linux/lockd/lockd.h>
#include <asm/unaligned.h>
+#include "netns.h"
+
#define NLMDBG_FACILITY NLMDBG_MONITOR
#define NSM_PROGRAM 100024
#define NSM_VERSION 1
@@ -39,6 +42,7 @@ struct nsm_args {
u32 proc;
char *mon_name;
+ char *nodename;
};
struct nsm_res {
@@ -46,7 +50,7 @@ struct nsm_res {
u32 state;
};
-static struct rpc_program nsm_program;
+static const struct rpc_program nsm_program;
static LIST_HEAD(nsm_handles);
static DEFINE_SPINLOCK(nsm_lock);
@@ -54,21 +58,22 @@ static DEFINE_SPINLOCK(nsm_lock);
* Local NSM state
*/
u32 __read_mostly nsm_local_state;
-int __read_mostly nsm_use_hostnames;
+bool __read_mostly nsm_use_hostnames;
static inline struct sockaddr *nsm_addr(const struct nsm_handle *nsm)
{
return (struct sockaddr *)&nsm->sm_addr;
}
-static struct rpc_clnt *nsm_create(void)
+static struct rpc_clnt *nsm_create(struct net *net)
{
struct sockaddr_in sin = {
.sin_family = AF_INET,
.sin_addr.s_addr = htonl(INADDR_LOOPBACK),
};
struct rpc_create_args args = {
- .protocol = XPRT_TRANSPORT_UDP,
+ .net = net,
+ .protocol = XPRT_TRANSPORT_TCP,
.address = (struct sockaddr *)&sin,
.addrsize = sizeof(sin),
.servername = "rpc.statd",
@@ -81,9 +86,61 @@ static struct rpc_clnt *nsm_create(void)
return rpc_create(&args);
}
-static int nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res)
+static struct rpc_clnt *nsm_client_set(struct lockd_net *ln,
+ struct rpc_clnt *clnt)
+{
+ spin_lock(&ln->nsm_clnt_lock);
+ if (ln->nsm_users == 0) {
+ if (clnt == NULL)
+ goto out;
+ ln->nsm_clnt = clnt;
+ }
+ clnt = ln->nsm_clnt;
+ ln->nsm_users++;
+out:
+ spin_unlock(&ln->nsm_clnt_lock);
+ return clnt;
+}
+
+static struct rpc_clnt *nsm_client_get(struct net *net)
+{
+ struct rpc_clnt *clnt, *new;
+ struct lockd_net *ln = net_generic(net, lockd_net_id);
+
+ clnt = nsm_client_set(ln, NULL);
+ if (clnt != NULL)
+ goto out;
+
+ clnt = new = nsm_create(net);
+ if (IS_ERR(clnt))
+ goto out;
+
+ clnt = nsm_client_set(ln, new);
+ if (clnt != new)
+ rpc_shutdown_client(new);
+out:
+ return clnt;
+}
+
+static void nsm_client_put(struct net *net)
+{
+ struct lockd_net *ln = net_generic(net, lockd_net_id);
+ struct rpc_clnt *clnt = NULL;
+
+ spin_lock(&ln->nsm_clnt_lock);
+ ln->nsm_users--;
+ if (ln->nsm_users == 0) {
+ clnt = ln->nsm_clnt;
+ ln->nsm_clnt = NULL;
+ }
+ spin_unlock(&ln->nsm_clnt_lock);
+ if (clnt != NULL)
+ rpc_shutdown_client(clnt);
+}
+
+static int nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res,
+ struct rpc_clnt *clnt)
{
- struct rpc_clnt *clnt;
int status;
struct nsm_args args = {
.priv = &nsm->sm_priv,
@@ -91,31 +148,22 @@ static int nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res)
.vers = 3,
.proc = NLMPROC_NSM_NOTIFY,
.mon_name = nsm->sm_mon_name,
+ .nodename = clnt->cl_nodename,
};
struct rpc_message msg = {
.rpc_argp = &args,
.rpc_resp = res,
};
- clnt = nsm_create();
- if (IS_ERR(clnt)) {
- status = PTR_ERR(clnt);
- dprintk("lockd: failed to create NSM upcall transport, "
- "status=%d\n", status);
- goto out;
- }
-
memset(res, 0, sizeof(*res));
msg.rpc_proc = &clnt->cl_procinfo[proc];
- status = rpc_call_sync(clnt, &msg, 0);
+ status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFTCONN);
if (status < 0)
dprintk("lockd: NSM upcall RPC failed, status=%d\n",
status);
else
status = 0;
- rpc_shutdown_client(clnt);
- out:
return status;
}
@@ -135,6 +183,7 @@ int nsm_monitor(const struct nlm_host *host)
struct nsm_handle *nsm = host->h_nsmhandle;
struct nsm_res res;
int status;
+ struct rpc_clnt *clnt;
dprintk("lockd: nsm_monitor(%s)\n", nsm->sm_name);
@@ -147,7 +196,15 @@ int nsm_monitor(const struct nlm_host *host)
*/
nsm->sm_mon_name = nsm_use_hostnames ? nsm->sm_name : nsm->sm_addrbuf;
- status = nsm_mon_unmon(nsm, NSMPROC_MON, &res);
+ clnt = nsm_client_get(host->net);
+ if (IS_ERR(clnt)) {
+ status = PTR_ERR(clnt);
+ dprintk("lockd: failed to create NSM upcall transport, "
+ "status=%d, net=%p\n", status, host->net);
+ return status;
+ }
+
+ status = nsm_mon_unmon(nsm, NSMPROC_MON, &res, clnt);
if (unlikely(res.status != 0))
status = -EIO;
if (unlikely(status < 0)) {
@@ -179,9 +236,11 @@ void nsm_unmonitor(const struct nlm_host *host)
if (atomic_read(&nsm->sm_count) == 1
&& nsm->sm_monitored && !nsm->sm_sticky) {
+ struct lockd_net *ln = net_generic(host->net, lockd_net_id);
+
dprintk("lockd: nsm_unmonitor(%s)\n", nsm->sm_name);
- status = nsm_mon_unmon(nsm, NSMPROC_UNMON, &res);
+ status = nsm_mon_unmon(nsm, NSMPROC_UNMON, &res, ln->nsm_clnt);
if (res.status != 0)
status = -EIO;
if (status < 0)
@@ -189,6 +248,8 @@ void nsm_unmonitor(const struct nlm_host *host)
nsm->sm_name);
else
nsm->sm_monitored = 0;
+
+ nsm_client_put(host->net);
}
}
@@ -349,9 +410,9 @@ retry:
* nsm_reboot_lookup - match NLMPROC_SM_NOTIFY arguments to an nsm_handle
* @info: pointer to NLMPROC_SM_NOTIFY arguments
*
- * Returns a matching nsm_handle if found in the nsm cache; the returned
- * nsm_handle's reference count is bumped and sm_monitored is cleared.
- * Otherwise returns NULL if some error occurred.
+ * Returns a matching nsm_handle if found in the nsm cache. The returned
+ * nsm_handle's reference count is bumped. Otherwise returns NULL if some
+ * error occurred.
*/
struct nsm_handle *nsm_reboot_lookup(const struct nlm_reboot *info)
{
@@ -370,12 +431,6 @@ struct nsm_handle *nsm_reboot_lookup(const struct nlm_reboot *info)
atomic_inc(&cached->sm_count);
spin_unlock(&nsm_lock);
- /*
- * During subsequent lock activity, force a fresh
- * notification to be set up for this host.
- */
- cached->sm_monitored = 0;
-
dprintk("lockd: host %s (%s) rebooted, cnt %d\n",
cached->sm_name, cached->sm_addrbuf,
atomic_read(&cached->sm_count));
@@ -405,26 +460,21 @@ void nsm_release(struct nsm_handle *nsm)
* Status Monitor wire protocol.
*/
-static int encode_nsm_string(struct xdr_stream *xdr, const char *string)
+static void encode_nsm_string(struct xdr_stream *xdr, const char *string)
{
const u32 len = strlen(string);
__be32 *p;
- if (unlikely(len > SM_MAXSTRLEN))
- return -EIO;
- p = xdr_reserve_space(xdr, sizeof(u32) + len);
- if (unlikely(p == NULL))
- return -EIO;
+ p = xdr_reserve_space(xdr, 4 + len);
xdr_encode_opaque(p, string, len);
- return 0;
}
/*
* "mon_name" specifies the host to be monitored.
*/
-static int encode_mon_name(struct xdr_stream *xdr, const struct nsm_args *argp)
+static void encode_mon_name(struct xdr_stream *xdr, const struct nsm_args *argp)
{
- return encode_nsm_string(xdr, argp->mon_name);
+ encode_nsm_string(xdr, argp->mon_name);
}
/*
@@ -433,35 +483,25 @@ static int encode_mon_name(struct xdr_stream *xdr, const struct nsm_args *argp)
* (via the NLMPROC_SM_NOTIFY call) that the state of host "mon_name"
* has changed.
*/
-static int encode_my_id(struct xdr_stream *xdr, const struct nsm_args *argp)
+static void encode_my_id(struct xdr_stream *xdr, const struct nsm_args *argp)
{
- int status;
__be32 *p;
- status = encode_nsm_string(xdr, utsname()->nodename);
- if (unlikely(status != 0))
- return status;
- p = xdr_reserve_space(xdr, 3 * sizeof(u32));
- if (unlikely(p == NULL))
- return -EIO;
- *p++ = htonl(argp->prog);
- *p++ = htonl(argp->vers);
- *p++ = htonl(argp->proc);
- return 0;
+ encode_nsm_string(xdr, argp->nodename);
+ p = xdr_reserve_space(xdr, 4 + 4 + 4);
+ *p++ = cpu_to_be32(argp->prog);
+ *p++ = cpu_to_be32(argp->vers);
+ *p = cpu_to_be32(argp->proc);
}
/*
* The "mon_id" argument specifies the non-private arguments
* of an NSMPROC_MON or NSMPROC_UNMON call.
*/
-static int encode_mon_id(struct xdr_stream *xdr, const struct nsm_args *argp)
+static void encode_mon_id(struct xdr_stream *xdr, const struct nsm_args *argp)
{
- int status;
-
- status = encode_mon_name(xdr, argp);
- if (unlikely(status != 0))
- return status;
- return encode_my_id(xdr, argp);
+ encode_mon_name(xdr, argp);
+ encode_my_id(xdr, argp);
}
/*
@@ -469,68 +509,56 @@ static int encode_mon_id(struct xdr_stream *xdr, const struct nsm_args *argp)
* by the NSMPROC_MON call. This information will be supplied in the
* NLMPROC_SM_NOTIFY call.
*/
-static int encode_priv(struct xdr_stream *xdr, const struct nsm_args *argp)
+static void encode_priv(struct xdr_stream *xdr, const struct nsm_args *argp)
{
__be32 *p;
p = xdr_reserve_space(xdr, SM_PRIV_SIZE);
- if (unlikely(p == NULL))
- return -EIO;
xdr_encode_opaque_fixed(p, argp->priv->data, SM_PRIV_SIZE);
- return 0;
}
-static int xdr_enc_mon(struct rpc_rqst *req, __be32 *p,
- const struct nsm_args *argp)
+static void nsm_xdr_enc_mon(struct rpc_rqst *req, struct xdr_stream *xdr,
+ const struct nsm_args *argp)
{
- struct xdr_stream xdr;
- int status;
-
- xdr_init_encode(&xdr, &req->rq_snd_buf, p);
- status = encode_mon_id(&xdr, argp);
- if (unlikely(status))
- return status;
- return encode_priv(&xdr, argp);
+ encode_mon_id(xdr, argp);
+ encode_priv(xdr, argp);
}
-static int xdr_enc_unmon(struct rpc_rqst *req, __be32 *p,
- const struct nsm_args *argp)
+static void nsm_xdr_enc_unmon(struct rpc_rqst *req, struct xdr_stream *xdr,
+ const struct nsm_args *argp)
{
- struct xdr_stream xdr;
-
- xdr_init_encode(&xdr, &req->rq_snd_buf, p);
- return encode_mon_id(&xdr, argp);
+ encode_mon_id(xdr, argp);
}
-static int xdr_dec_stat_res(struct rpc_rqst *rqstp, __be32 *p,
- struct nsm_res *resp)
+static int nsm_xdr_dec_stat_res(struct rpc_rqst *rqstp,
+ struct xdr_stream *xdr,
+ struct nsm_res *resp)
{
- struct xdr_stream xdr;
+ __be32 *p;
- xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
- p = xdr_inline_decode(&xdr, 2 * sizeof(u32));
+ p = xdr_inline_decode(xdr, 4 + 4);
if (unlikely(p == NULL))
return -EIO;
- resp->status = ntohl(*p++);
- resp->state = ntohl(*p);
+ resp->status = be32_to_cpup(p++);
+ resp->state = be32_to_cpup(p);
- dprintk("lockd: xdr_dec_stat_res status %d state %d\n",
- resp->status, resp->state);
+ dprintk("lockd: %s status %d state %d\n",
+ __func__, resp->status, resp->state);
return 0;
}
-static int xdr_dec_stat(struct rpc_rqst *rqstp, __be32 *p,
- struct nsm_res *resp)
+static int nsm_xdr_dec_stat(struct rpc_rqst *rqstp,
+ struct xdr_stream *xdr,
+ struct nsm_res *resp)
{
- struct xdr_stream xdr;
+ __be32 *p;
- xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
- p = xdr_inline_decode(&xdr, sizeof(u32));
+ p = xdr_inline_decode(xdr, 4);
if (unlikely(p == NULL))
return -EIO;
- resp->state = ntohl(*p);
+ resp->state = be32_to_cpup(p);
- dprintk("lockd: xdr_dec_stat state %d\n", resp->state);
+ dprintk("lockd: %s state %d\n", __func__, resp->state);
return 0;
}
@@ -546,8 +574,8 @@ static int xdr_dec_stat(struct rpc_rqst *rqstp, __be32 *p,
static struct rpc_procinfo nsm_procedures[] = {
[NSMPROC_MON] = {
.p_proc = NSMPROC_MON,
- .p_encode = (kxdrproc_t)xdr_enc_mon,
- .p_decode = (kxdrproc_t)xdr_dec_stat_res,
+ .p_encode = (kxdreproc_t)nsm_xdr_enc_mon,
+ .p_decode = (kxdrdproc_t)nsm_xdr_dec_stat_res,
.p_arglen = SM_mon_sz,
.p_replen = SM_monres_sz,
.p_statidx = NSMPROC_MON,
@@ -555,8 +583,8 @@ static struct rpc_procinfo nsm_procedures[] = {
},
[NSMPROC_UNMON] = {
.p_proc = NSMPROC_UNMON,
- .p_encode = (kxdrproc_t)xdr_enc_unmon,
- .p_decode = (kxdrproc_t)xdr_dec_stat,
+ .p_encode = (kxdreproc_t)nsm_xdr_enc_unmon,
+ .p_decode = (kxdrdproc_t)nsm_xdr_dec_stat,
.p_arglen = SM_mon_id_sz,
.p_replen = SM_unmonres_sz,
.p_statidx = NSMPROC_UNMON,
@@ -564,19 +592,19 @@ static struct rpc_procinfo nsm_procedures[] = {
},
};
-static struct rpc_version nsm_version1 = {
+static const struct rpc_version nsm_version1 = {
.number = 1,
.nrprocs = ARRAY_SIZE(nsm_procedures),
.procs = nsm_procedures
};
-static struct rpc_version * nsm_version[] = {
+static const struct rpc_version *nsm_version[] = {
[1] = &nsm_version1,
};
static struct rpc_stat nsm_stats;
-static struct rpc_program nsm_program = {
+static const struct rpc_program nsm_program = {
.name = "statd",
.number = NSM_PROGRAM,
.nrvers = ARRAY_SIZE(nsm_version),
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 11:48:15 +0000