Merge git://git.linux-nfs.org/projects/trondmy/nfs-2.6

* git://git.linux-nfs.org/projects/trondmy/nfs-2.6: (80 commits)
  SUNRPC: Invalidate the RPCSEC_GSS session if the server dropped the request
  make nfs_automount_list static
  NFS: remove duplicate flags assignment from nfs_validate_mount_data
  NFS - fix potential NULL pointer dereference v2
  SUNRPC: Don't change the RPCSEC_GSS context on a credential that is in use
  SUNRPC: Fix a race in gss_refresh_upcall()
  SUNRPC: Don't disconnect more than once if retransmitting NFSv4 requests
  SUNRPC: Remove the unused export of xprt_force_disconnect
  SUNRPC: remove XS_SENDMSG_RETRY
  SUNRPC: Protect creds against early garbage collection
  NFSv4: Attempt to use machine credentials in SETCLIENTID calls
  NFSv4: Reintroduce machine creds
  NFSv4: Don't use cred->cr_ops->cr_name in nfs4_proc_setclientid()
  nfs: fix printout of multiword bitfields
  nfs: return negative error value from nfs{,4}_stat_to_errno
  NLM/lockd: Ensure client locking calls use correct credentials
  NFS: Remove the buggy lock-if-signalled case from do_setlk()
  NLM/lockd: Fix a race when cancelling a blocking lock
  NLM/lockd: Ensure that nlmclnt_cancel() returns results of the CANCEL call
  NLM: Remove the signal masking in nlmclnt_proc/nlmclnt_cancel
  ...

1 files changed, 68 insertions, 37 deletions

diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index 5828e5c060ca..cc12d5f5d5da 100644
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -114,27 +114,14 @@ static void
 gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx)
 {
         struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
-        struct gss_cl_ctx *old;
 
-        old = gss_cred->gc_ctx;
+        if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
+                return;
+        gss_get_ctx(ctx);
         rcu_assign_pointer(gss_cred->gc_ctx, ctx);
         set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
+        smp_mb__before_clear_bit();
         clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags);
-        if (old)
-                gss_put_ctx(old);
-}
-
-static int
-gss_cred_is_uptodate_ctx(struct rpc_cred *cred)
-{
-        struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
-        int res = 0;
-
-        rcu_read_lock();
-        if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) && gss_cred->gc_ctx)
-                res = 1;
-        rcu_read_unlock();
-        return res;
 }
 
 static const void *
@@ -266,6 +253,7 @@ gss_release_msg(struct gss_upcall_msg *gss_msg)
         BUG_ON(!list_empty(&gss_msg->list));
         if (gss_msg->ctx != NULL)
                 gss_put_ctx(gss_msg->ctx);
+        rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue);
         kfree(gss_msg);
 }
 
@@ -339,7 +327,7 @@ gss_upcall_callback(struct rpc_task *task)
 
         spin_lock(&inode->i_lock);
         if (gss_msg->ctx)
-                gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_get_ctx(gss_msg->ctx));
+                gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx);
         else
                 task->tk_status = gss_msg->msg.errno;
         gss_cred->gc_upcall = NULL;
@@ -370,9 +358,16 @@ gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid)
 static struct gss_upcall_msg *
 gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred)
 {
+        struct gss_cred *gss_cred = container_of(cred,
+                        struct gss_cred, gc_base);
         struct gss_upcall_msg *gss_new, *gss_msg;
+        uid_t uid = cred->cr_uid;
 
-        gss_new = gss_alloc_msg(gss_auth, cred->cr_uid);
+        /* Special case: rpc.gssd assumes that uid == 0 implies machine creds */
+        if (gss_cred->gc_machine_cred != 0)
+                uid = 0;
+
+        gss_new = gss_alloc_msg(gss_auth, uid);
         if (gss_new == NULL)
                 return ERR_PTR(-ENOMEM);
         gss_msg = gss_add_msg(gss_auth, gss_new);
@@ -408,13 +403,17 @@ gss_refresh_upcall(struct rpc_task *task)
         }
         spin_lock(&inode->i_lock);
         if (gss_cred->gc_upcall != NULL)
-                rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL, NULL);
-        else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) {
+                rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL);
+        else if (gss_msg->ctx != NULL) {
+                gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx);
+                gss_cred->gc_upcall = NULL;
+                rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
+        } else if (gss_msg->msg.errno >= 0) {
                 task->tk_timeout = 0;
                 gss_cred->gc_upcall = gss_msg;
                 /* gss_upcall_callback will release the reference to gss_upcall_msg */
                 atomic_inc(&gss_msg->count);
-                rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback, NULL);
+                rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback);
         } else
                 err = gss_msg->msg.errno;
         spin_unlock(&inode->i_lock);
@@ -454,7 +453,7 @@ gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
                 schedule();
         }
         if (gss_msg->ctx)
-                gss_cred_set_ctx(cred, gss_get_ctx(gss_msg->ctx));
+                gss_cred_set_ctx(cred, gss_msg->ctx);
         else
                 err = gss_msg->msg.errno;
         spin_unlock(&inode->i_lock);
@@ -709,7 +708,7 @@ gss_destroying_context(struct rpc_cred *cred)
         struct rpc_task *task;
 
         if (gss_cred->gc_ctx == NULL ||
-                        gss_cred->gc_ctx->gc_proc == RPC_GSS_PROC_DESTROY)
+            test_and_clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0)
                 return 0;
 
         gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY;
@@ -719,7 +718,7 @@ gss_destroying_context(struct rpc_cred *cred)
          * by the RPC call or by the put_rpccred() below */
         get_rpccred(cred);
 
-        task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC);
+        task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT);
         if (!IS_ERR(task))
                 rpc_put_task(task);
 
@@ -817,6 +816,7 @@ gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
          */
         cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW;
         cred->gc_service = gss_auth->service;
+        cred->gc_machine_cred = acred->machine_cred;
         kref_get(&gss_auth->kref);
         return &cred->gc_base;
 
@@ -843,17 +843,16 @@ gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags)
 {
         struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
 
-        /*
-         * If the searchflags have set RPCAUTH_LOOKUP_NEW, then
-         * we don't really care if the credential has expired or not,
-         * since the caller should be prepared to reinitialise it.
-         */
-        if ((flags & RPCAUTH_LOOKUP_NEW) && test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags))
+        if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags))
                 goto out;
         /* Don't match with creds that have expired. */
-        if (gss_cred->gc_ctx && time_after(jiffies, gss_cred->gc_ctx->gc_expiry))
+        if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry))
+                return 0;
+        if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags))
                 return 0;
 out:
+        if (acred->machine_cred != gss_cred->gc_machine_cred)
+                return 0;
         return (rc->cr_uid == acred->uid);
 }
 
@@ -917,16 +916,48 @@ out_put_ctx:
         return NULL;
 }
 
+static int gss_renew_cred(struct rpc_task *task)
+{
+        struct rpc_cred *oldcred = task->tk_msg.rpc_cred;
+        struct gss_cred *gss_cred = container_of(oldcred,
+                                                 struct gss_cred,
+                                                 gc_base);
+        struct rpc_auth *auth = oldcred->cr_auth;
+        struct auth_cred acred = {
+                .uid = oldcred->cr_uid,
+                .machine_cred = gss_cred->gc_machine_cred,
+        };
+        struct rpc_cred *new;
+
+        new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW);
+        if (IS_ERR(new))
+                return PTR_ERR(new);
+        task->tk_msg.rpc_cred = new;
+        put_rpccred(oldcred);
+        return 0;
+}
+
 /*
 * Refresh credentials. XXX - finish
 */
 static int
 gss_refresh(struct rpc_task *task)
 {
+        struct rpc_cred *cred = task->tk_msg.rpc_cred;
+        int ret = 0;
+
+        if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) &&
+                        !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) {
+                ret = gss_renew_cred(task);
+                if (ret < 0)
+                        goto out;
+                cred = task->tk_msg.rpc_cred;
+        }
 
-        if (!gss_cred_is_uptodate_ctx(task->tk_msg.rpc_cred))
-                return gss_refresh_upcall(task);
-        return 0;
+        if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
+                ret = gss_refresh_upcall(task);
+out:
+        return ret;
 }
 
 /* Dummy refresh routine: used only when destroying the context */
@@ -1286,9 +1317,7 @@ out:
 static const struct rpc_authops authgss_ops = {
         .owner          = THIS_MODULE,
         .au_flavor      = RPC_AUTH_GSS,
-#ifdef RPC_DEBUG
         .au_name        = "RPCSEC_GSS",
-#endif
         .create         = gss_create,
         .destroy        = gss_destroy,
         .lookup_cred    = gss_lookup_cred,
@@ -1299,6 +1328,7 @@ static const struct rpc_credops gss_credops = {
         .cr_name        = "AUTH_GSS",
         .crdestroy      = gss_destroy_cred,
         .cr_init        = gss_cred_init,
+        .crbind         = rpcauth_generic_bind_cred,
         .crmatch        = gss_match,
         .crmarshal      = gss_marshal,
         .crrefresh      = gss_refresh,
@@ -1310,6 +1340,7 @@ static const struct rpc_credops gss_credops = {
 static const struct rpc_credops gss_nullops = {
         .cr_name        = "AUTH_GSS",
         .crdestroy      = gss_destroy_cred,
+        .crbind         = rpcauth_generic_bind_cred,
         .crmatch        = gss_match,
         .crmarshal      = gss_marshal,
         .crrefresh      = gss_refresh_null,