nfsd: make NFSv4 lease time per net

Lease time is a part of NFSv4 state engine, which is constructed per network
namespace.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

6 files changed, 19 insertions, 12 deletions

diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h
index 9047706b3e10..0c20be82cb01 100644
--- a/fs/nfsd/netns.h
+++ b/fs/nfsd/netns.h
@@ -87,6 +87,8 @@ struct nfsd_net {
 
         struct file *rec_file;
         bool in_grace;
+
+        time_t nfsd4_lease;
 };
 
 extern int nfsd_net_id;
diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 826cc269c445..99bc85ff0217 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -36,6 +36,7 @@
 #include <linux/slab.h>
 #include "nfsd.h"
 #include "state.h"
+#include "netns.h"
 
 #define NFSDDBG_FACILITY                NFSDDBG_PROC
 
@@ -625,9 +626,10 @@ static const struct rpc_program cb_program = {
         .pipe_dir_name          = "nfsd4_cb",
 };
 
-static int max_cb_time(void)
+static int max_cb_time(struct net *net)
 {
-        return max(nfsd4_lease/10, (time_t)1) * HZ;
+        struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+        return max(nn->nfsd4_lease/10, (time_t)1) * HZ;
 }
 
 static struct rpc_cred *callback_cred;
@@ -659,7 +661,7 @@ static struct rpc_cred *get_backchannel_cred(struct nfs4_client *clp, struct rpc
 static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *conn, struct nfsd4_session *ses)
 {
         struct rpc_timeout      timeparms = {
-                .to_initval     = max_cb_time(),
+                .to_initval     = max_cb_time(clp->net),
                 .to_retries     = 0,
         };
         struct rpc_create_args args = {
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index fb98f291aac2..932b2ca6f203 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -51,7 +51,6 @@
 #define NFSDDBG_FACILITY                NFSDDBG_PROC
 
 /* Globals */
-time_t nfsd4_lease = 90;     /* default lease time */
 time_t nfsd4_grace = 90;
 
 #define all_ones {{~0,~0},~0}
@@ -3184,7 +3183,7 @@ nfsd4_end_grace(struct nfsd_net *nn)
          * to see the (possibly new, possibly shorter) lease time, we
          * can safely set the next grace time to the current lease time:
          */
-        nfsd4_grace = nfsd4_lease;
+        nfsd4_grace = nn->nfsd4_lease;
 }
 
 static time_t
@@ -3194,9 +3193,9 @@ nfs4_laundromat(struct nfsd_net *nn)
         struct nfs4_openowner *oo;
         struct nfs4_delegation *dp;
         struct list_head *pos, *next, reaplist;
-        time_t cutoff = get_seconds() - nfsd4_lease;
-        time_t t, clientid_val = nfsd4_lease;
-        time_t u, test_val = nfsd4_lease;
+        time_t cutoff = get_seconds() - nn->nfsd4_lease;
+        time_t t, clientid_val = nn->nfsd4_lease;
+        time_t u, test_val = nn->nfsd4_lease;
 
         nfs4_lock_state();
 
@@ -3245,7 +3244,7 @@ nfs4_laundromat(struct nfsd_net *nn)
                 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
                 unhash_delegation(dp);
         }
-        test_val = nfsd4_lease;
+        test_val = nn->nfsd4_lease;
         list_for_each_safe(pos, next, &nn->close_lru) {
                 oo = container_of(pos, struct nfs4_openowner, oo_close_lru);
                 if (time_after((unsigned long)oo->oo_time, (unsigned long)cutoff)) {
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 250171c5c311..b775366a0a68 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -53,6 +53,7 @@
 #include "vfs.h"
 #include "state.h"
 #include "cache.h"
+#include "netns.h"
 
 #define NFSDDBG_FACILITY                NFSDDBG_XDR
 
@@ -2052,6 +2053,7 @@ nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
                 .mnt    = exp->ex_path.mnt,
                 .dentry = dentry,
         };
+        struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
 
         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
@@ -2212,7 +2214,7 @@ nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
                 if ((buflen -= 4) < 0)
                         goto out_resource;
-                WRITE32(nfsd4_lease);
+                WRITE32(nn->nfsd4_lease);
         }
         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
                 if ((buflen -= 4) < 0)
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index f5ab74af6ce2..09d909a42ece 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -909,7 +909,8 @@ static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, time_
  */
 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
 {
-        return nfsd4_write_time(file, buf, size, &nfsd4_lease);
+        struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
+        return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease);
 }
 
 /**
@@ -1060,6 +1061,7 @@ int nfsd_net_id;
 static __net_init int nfsd_init_net(struct net *net)
 {
         int retval;
+        struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 
         retval = nfsd_export_init(net);
         if (retval)
@@ -1067,6 +1069,7 @@ static __net_init int nfsd_init_net(struct net *net)
         retval = nfsd_idmap_init(net);
         if (retval)
                 goto out_idmap_error;
+        nn->nfsd4_lease = 90;   /* default lease time */
         return 0;
 
 out_idmap_error:
diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h
index d7b210b735e1..a8f7325a9124 100644
--- a/fs/nfsd/nfsd.h
+++ b/fs/nfsd/nfsd.h
@@ -276,7 +276,6 @@ extern struct timeval	nfssvc_boot;
 
 #ifdef CONFIG_NFSD_V4
 
-extern time_t nfsd4_lease;
 extern time_t nfsd4_grace;
 
 /* before processing a COMPOUND operation, we have to check that there