1 files changed, 606 insertions, 0 deletions

diff --git a/fs/lockd/svcproc.c b/fs/lockd/svcproc.c
new file mode 100644
index 000000000000..757e344cf200
--- /dev/null
+++ b/fs/lockd/svcproc.c
@@ -0,0 +1,606 @@
+/*
+ * linux/fs/lockd/svcproc.c
+ *
+ * Lockd server procedures. We don't implement the NLM_*_RES 
+ * procedures because we don't use the async procedures.
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/time.h>
+#include <linux/slab.h>
+#include <linux/in.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/nfsd/nfsd.h>
+#include <linux/lockd/lockd.h>
+#include <linux/lockd/share.h>
+#include <linux/lockd/sm_inter.h>
+
+
+#define NLMDBG_FACILITY         NLMDBG_CLIENT
+
+static u32      nlmsvc_callback(struct svc_rqst *, u32, struct nlm_res *);
+static void     nlmsvc_callback_exit(struct rpc_task *);
+
+#ifdef CONFIG_LOCKD_V4
+static u32
+cast_to_nlm(u32 status, u32 vers)
+{
+        /* Note: status is assumed to be in network byte order !!! */
+        if (vers != 4){
+                switch (status) {
+                case nlm_granted:
+                case nlm_lck_denied:
+                case nlm_lck_denied_nolocks:
+                case nlm_lck_blocked:
+                case nlm_lck_denied_grace_period:
+                        break;
+                case nlm4_deadlock:
+                        status = nlm_lck_denied;
+                        break;
+                default:
+                        status = nlm_lck_denied_nolocks;
+                }
+        }
+
+        return (status);
+}
+#define cast_status(status) (cast_to_nlm(status, rqstp->rq_vers))
+#else
+#define cast_status(status) (status)
+#endif
+
+/*
+ * Obtain client and file from arguments
+ */
+static u32
+nlmsvc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
+                        struct nlm_host **hostp, struct nlm_file **filp)
+{
+        struct nlm_host         *host = NULL;
+        struct nlm_file         *file = NULL;
+        struct nlm_lock         *lock = &argp->lock;
+        u32                     error;
+
+        /* nfsd callbacks must have been installed for this procedure */
+        if (!nlmsvc_ops)
+                return nlm_lck_denied_nolocks;
+
+        /* Obtain host handle */
+        if (!(host = nlmsvc_lookup_host(rqstp))
+         || (argp->monitor && !host->h_monitored && nsm_monitor(host) < 0))
+                goto no_locks;
+        *hostp = host;
+
+        /* Obtain file pointer. Not used by FREE_ALL call. */
+        if (filp != NULL) {
+                if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
+                        goto no_locks;
+                *filp = file;
+
+                /* Set up the missing parts of the file_lock structure */
+                lock->fl.fl_file  = file->f_file;
+                lock->fl.fl_owner = (fl_owner_t) host;
+                lock->fl.fl_lmops = &nlmsvc_lock_operations;
+        }
+
+        return 0;
+
+no_locks:
+        if (host)
+                nlm_release_host(host);
+        return nlm_lck_denied_nolocks;
+}
+
+/*
+ * NULL: Test for presence of service
+ */
+static int
+nlmsvc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
+{
+        dprintk("lockd: NULL          called\n");
+        return rpc_success;
+}
+
+/*
+ * TEST: Check for conflicting lock
+ */
+static int
+nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
+                                         struct nlm_res  *resp)
+{
+        struct nlm_host *host;
+        struct nlm_file *file;
+
+        dprintk("lockd: TEST          called\n");
+        resp->cookie = argp->cookie;
+
+        /* Don't accept test requests during grace period */
+        if (nlmsvc_grace_period) {
+                resp->status = nlm_lck_denied_grace_period;
+                return rpc_success;
+        }
+
+        /* Obtain client and file */
+        if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
+                return rpc_success;
+
+        /* Now check for conflicting locks */
+        resp->status = cast_status(nlmsvc_testlock(file, &argp->lock, &resp->lock));
+
+        dprintk("lockd: TEST          status %d vers %d\n",
+                ntohl(resp->status), rqstp->rq_vers);
+        nlm_release_host(host);
+        nlm_release_file(file);
+        return rpc_success;
+}
+
+static int
+nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
+                                         struct nlm_res  *resp)
+{
+        struct nlm_host *host;
+        struct nlm_file *file;
+
+        dprintk("lockd: LOCK          called\n");
+
+        resp->cookie = argp->cookie;
+
+        /* Don't accept new lock requests during grace period */
+        if (nlmsvc_grace_period && !argp->reclaim) {
+                resp->status = nlm_lck_denied_grace_period;
+                return rpc_success;
+        }
+
+        /* Obtain client and file */
+        if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
+                return rpc_success;
+
+#if 0
+        /* If supplied state doesn't match current state, we assume it's
+         * an old request that time-warped somehow. Any error return would
+         * do in this case because it's irrelevant anyway.
+         *
+         * NB: We don't retrieve the remote host's state yet.
+         */
+        if (host->h_nsmstate && host->h_nsmstate != argp->state) {
+                resp->status = nlm_lck_denied_nolocks;
+        } else
+#endif
+
+        /* Now try to lock the file */
+        resp->status = cast_status(nlmsvc_lock(rqstp, file, &argp->lock,
+                                               argp->block, &argp->cookie));
+
+        dprintk("lockd: LOCK          status %d\n", ntohl(resp->status));
+        nlm_release_host(host);
+        nlm_release_file(file);
+        return rpc_success;
+}
+
+static int
+nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
+                                           struct nlm_res  *resp)
+{
+        struct nlm_host *host;
+        struct nlm_file *file;
+
+        dprintk("lockd: CANCEL        called\n");
+
+        resp->cookie = argp->cookie;
+
+        /* Don't accept requests during grace period */
+        if (nlmsvc_grace_period) {
+                resp->status = nlm_lck_denied_grace_period;
+                return rpc_success;
+        }
+
+        /* Obtain client and file */
+        if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
+                return rpc_success;
+
+        /* Try to cancel request. */
+        resp->status = cast_status(nlmsvc_cancel_blocked(file, &argp->lock));
+
+        dprintk("lockd: CANCEL        status %d\n", ntohl(resp->status));
+        nlm_release_host(host);
+        nlm_release_file(file);
+        return rpc_success;
+}
+
+/*
+ * UNLOCK: release a lock
+ */
+static int
+nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
+                                           struct nlm_res  *resp)
+{
+        struct nlm_host *host;
+        struct nlm_file *file;
+
+        dprintk("lockd: UNLOCK        called\n");
+
+        resp->cookie = argp->cookie;
+
+        /* Don't accept new lock requests during grace period */
+        if (nlmsvc_grace_period) {
+                resp->status = nlm_lck_denied_grace_period;
+                return rpc_success;
+        }
+
+        /* Obtain client and file */
+        if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
+                return rpc_success;
+
+        /* Now try to remove the lock */
+        resp->status = cast_status(nlmsvc_unlock(file, &argp->lock));
+
+        dprintk("lockd: UNLOCK        status %d\n", ntohl(resp->status));
+        nlm_release_host(host);
+        nlm_release_file(file);
+        return rpc_success;
+}
+
+/*
+ * GRANTED: A server calls us to tell that a process' lock request
+ * was granted
+ */
+static int
+nlmsvc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
+                                            struct nlm_res  *resp)
+{
+        resp->cookie = argp->cookie;
+
+        dprintk("lockd: GRANTED       called\n");
+        resp->status = nlmclnt_grant(&argp->lock);
+        dprintk("lockd: GRANTED       status %d\n", ntohl(resp->status));
+        return rpc_success;
+}
+
+/*
+ * `Async' versions of the above service routines. They aren't really,
+ * because we send the callback before the reply proper. I hope this
+ * doesn't break any clients.
+ */
+static int
+nlmsvc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
+                                             void            *resp)
+{
+        struct nlm_res  res;
+        u32             stat;
+
+        dprintk("lockd: TEST_MSG      called\n");
+        memset(&res, 0, sizeof(res));
+
+        if ((stat = nlmsvc_proc_test(rqstp, argp, &res)) == 0)
+                stat = nlmsvc_callback(rqstp, NLMPROC_TEST_RES, &res);
+        return stat;
+}
+
+static int
+nlmsvc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
+                                             void            *resp)
+{
+        struct nlm_res  res;
+        u32             stat;
+
+        dprintk("lockd: LOCK_MSG      called\n");
+        memset(&res, 0, sizeof(res));
+
+        if ((stat = nlmsvc_proc_lock(rqstp, argp, &res)) == 0)
+                stat = nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, &res);
+        return stat;
+}
+
+static int
+nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
+                                               void            *resp)
+{
+        struct nlm_res  res;
+        u32             stat;
+
+        dprintk("lockd: CANCEL_MSG    called\n");
+        memset(&res, 0, sizeof(res));
+
+        if ((stat = nlmsvc_proc_cancel(rqstp, argp, &res)) == 0)
+                stat = nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, &res);
+        return stat;
+}
+
+static int
+nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
+                                               void            *resp)
+{
+        struct nlm_res  res;
+        u32             stat;
+
+        dprintk("lockd: UNLOCK_MSG    called\n");
+        memset(&res, 0, sizeof(res));
+
+        if ((stat = nlmsvc_proc_unlock(rqstp, argp, &res)) == 0)
+                stat = nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, &res);
+        return stat;
+}
+
+static int
+nlmsvc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
+                                                void            *resp)
+{
+        struct nlm_res  res;
+        u32             stat;
+
+        dprintk("lockd: GRANTED_MSG   called\n");
+        memset(&res, 0, sizeof(res));
+
+        if ((stat = nlmsvc_proc_granted(rqstp, argp, &res)) == 0)
+                stat = nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, &res);
+        return stat;
+}
+
+/*
+ * SHARE: create a DOS share or alter existing share.
+ */
+static int
+nlmsvc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
+                                          struct nlm_res  *resp)
+{
+        struct nlm_host *host;
+        struct nlm_file *file;
+
+        dprintk("lockd: SHARE         called\n");
+
+        resp->cookie = argp->cookie;
+
+        /* Don't accept new lock requests during grace period */
+        if (nlmsvc_grace_period && !argp->reclaim) {
+                resp->status = nlm_lck_denied_grace_period;
+                return rpc_success;
+        }
+
+        /* Obtain client and file */
+        if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
+                return rpc_success;
+
+        /* Now try to create the share */
+        resp->status = cast_status(nlmsvc_share_file(host, file, argp));
+
+        dprintk("lockd: SHARE         status %d\n", ntohl(resp->status));
+        nlm_release_host(host);
+        nlm_release_file(file);
+        return rpc_success;
+}
+
+/*
+ * UNSHARE: Release a DOS share.
+ */
+static int
+nlmsvc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
+                                            struct nlm_res  *resp)
+{
+        struct nlm_host *host;
+        struct nlm_file *file;
+
+        dprintk("lockd: UNSHARE       called\n");
+
+        resp->cookie = argp->cookie;
+
+        /* Don't accept requests during grace period */
+        if (nlmsvc_grace_period) {
+                resp->status = nlm_lck_denied_grace_period;
+                return rpc_success;
+        }
+
+        /* Obtain client and file */
+        if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
+                return rpc_success;
+
+        /* Now try to unshare the file */
+        resp->status = cast_status(nlmsvc_unshare_file(host, file, argp));
+
+        dprintk("lockd: UNSHARE       status %d\n", ntohl(resp->status));
+        nlm_release_host(host);
+        nlm_release_file(file);
+        return rpc_success;
+}
+
+/*
+ * NM_LOCK: Create an unmonitored lock
+ */
+static int
+nlmsvc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
+                                            struct nlm_res  *resp)
+{
+        dprintk("lockd: NM_LOCK       called\n");
+
+        argp->monitor = 0;              /* just clean the monitor flag */
+        return nlmsvc_proc_lock(rqstp, argp, resp);
+}
+
+/*
+ * FREE_ALL: Release all locks and shares held by client
+ */
+static int
+nlmsvc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
+                                             void            *resp)
+{
+        struct nlm_host *host;
+
+        /* Obtain client */
+        if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL))
+                return rpc_success;
+
+        nlmsvc_free_host_resources(host);
+        nlm_release_host(host);
+        return rpc_success;
+}
+
+/*
+ * SM_NOTIFY: private callback from statd (not part of official NLM proto)
+ */
+static int
+nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
+                                              void              *resp)
+{
+        struct sockaddr_in      saddr = rqstp->rq_addr;
+        int                     vers = argp->vers;
+        int                     prot = argp->proto >> 1;
+        struct nlm_host         *host;
+
+        dprintk("lockd: SM_NOTIFY     called\n");
+        if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK)
+         || ntohs(saddr.sin_port) >= 1024) {
+                printk(KERN_WARNING
+                        "lockd: rejected NSM callback from %08x:%d\n",
+                        ntohl(rqstp->rq_addr.sin_addr.s_addr),
+                        ntohs(rqstp->rq_addr.sin_port));
+                return rpc_system_err;
+        }
+
+        /* Obtain the host pointer for this NFS server and try to
+         * reclaim all locks we hold on this server.
+         */
+        saddr.sin_addr.s_addr = argp->addr;
+        if ((argp->proto & 1)==0) {
+                if ((host = nlmclnt_lookup_host(&saddr, prot, vers)) != NULL) {
+                        nlmclnt_recovery(host, argp->state);
+                        nlm_release_host(host);
+                }
+        } else {
+                /* If we run on an NFS server, delete all locks held by the client */
+                if ((host = nlm_lookup_host(1, &saddr, prot, vers)) != NULL) {
+                        nlmsvc_free_host_resources(host);
+                        nlm_release_host(host);
+                }
+        }
+
+        return rpc_success;
+}
+
+/*
+ * client sent a GRANTED_RES, let's remove the associated block
+ */
+static int
+nlmsvc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res  *argp,
+                                                void            *resp)
+{
+        if (!nlmsvc_ops)
+                return rpc_success;
+
+        dprintk("lockd: GRANTED_RES   called\n");
+
+        nlmsvc_grant_reply(rqstp, &argp->cookie, argp->status);
+        return rpc_success;
+}
+
+/*
+ * This is the generic lockd callback for async RPC calls
+ */
+static u32
+nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_res *resp)
+{
+        struct nlm_host *host;
+        struct nlm_rqst *call;
+
+        if (!(call = nlmclnt_alloc_call()))
+                return rpc_system_err;
+
+        host = nlmclnt_lookup_host(&rqstp->rq_addr,
+                                rqstp->rq_prot, rqstp->rq_vers);
+        if (!host) {
+                kfree(call);
+                return rpc_system_err;
+        }
+
+        call->a_flags = RPC_TASK_ASYNC;
+        call->a_host  = host;
+        memcpy(&call->a_args, resp, sizeof(*resp));
+
+        if (nlmsvc_async_call(call, proc, nlmsvc_callback_exit) < 0)
+                goto error;
+
+        return rpc_success;
+ error:
+        nlm_release_host(host);
+        kfree(call);
+        return rpc_system_err;
+}
+
+static void
+nlmsvc_callback_exit(struct rpc_task *task)
+{
+        struct nlm_rqst *call = (struct nlm_rqst *) task->tk_calldata;
+
+        if (task->tk_status < 0) {
+                dprintk("lockd: %4d callback failed (errno = %d)\n",
+                                        task->tk_pid, -task->tk_status);
+        }
+        nlm_release_host(call->a_host);
+        kfree(call);
+}
+
+/*
+ * NLM Server procedures.
+ */
+
+#define nlmsvc_encode_norep     nlmsvc_encode_void
+#define nlmsvc_decode_norep     nlmsvc_decode_void
+#define nlmsvc_decode_testres   nlmsvc_decode_void
+#define nlmsvc_decode_lockres   nlmsvc_decode_void
+#define nlmsvc_decode_unlockres nlmsvc_decode_void
+#define nlmsvc_decode_cancelres nlmsvc_decode_void
+#define nlmsvc_decode_grantedres        nlmsvc_decode_void
+
+#define nlmsvc_proc_none        nlmsvc_proc_null
+#define nlmsvc_proc_test_res    nlmsvc_proc_null
+#define nlmsvc_proc_lock_res    nlmsvc_proc_null
+#define nlmsvc_proc_cancel_res  nlmsvc_proc_null
+#define nlmsvc_proc_unlock_res  nlmsvc_proc_null
+
+struct nlm_void                 { int dummy; };
+
+#define PROC(name, xargt, xrest, argt, rest, respsize)  \
+ { .pc_func     = (svc_procfunc) nlmsvc_proc_##name,    \
+   .pc_decode   = (kxdrproc_t) nlmsvc_decode_##xargt,   \
+   .pc_encode   = (kxdrproc_t) nlmsvc_encode_##xrest,   \
+   .pc_release  = NULL,                                 \
+   .pc_argsize  = sizeof(struct nlm_##argt),            \
+   .pc_ressize  = sizeof(struct nlm_##rest),            \
+   .pc_xdrressize = respsize,                           \
+ }
+
+#define Ck      (1+XDR_QUADLEN(NLM_MAXCOOKIELEN))       /* cookie */
+#define St      1                               /* status */
+#define No      (1+1024/4)                      /* Net Obj */
+#define Rg      2                               /* range - offset + size */
+
+struct svc_procedure            nlmsvc_procedures[] = {
+  PROC(null,            void,           void,           void,   void, 1),
+  PROC(test,            testargs,       testres,        args,   res, Ck+St+2+No+Rg),
+  PROC(lock,            lockargs,       res,            args,   res, Ck+St),
+  PROC(cancel,          cancargs,       res,            args,   res, Ck+St),
+  PROC(unlock,          unlockargs,     res,            args,   res, Ck+St),
+  PROC(granted,         testargs,       res,            args,   res, Ck+St),
+  PROC(test_msg,        testargs,       norep,          args,   void, 1),
+  PROC(lock_msg,        lockargs,       norep,          args,   void, 1),
+  PROC(cancel_msg,      cancargs,       norep,          args,   void, 1),
+  PROC(unlock_msg,      unlockargs,     norep,          args,   void, 1),
+  PROC(granted_msg,     testargs,       norep,          args,   void, 1),
+  PROC(test_res,        testres,        norep,          res,    void, 1),
+  PROC(lock_res,        lockres,        norep,          res,    void, 1),
+  PROC(cancel_res,      cancelres,      norep,          res,    void, 1),
+  PROC(unlock_res,      unlockres,      norep,          res,    void, 1),
+  PROC(granted_res,     res,            norep,          res,    void, 1),
+  /* statd callback */
+  PROC(sm_notify,       reboot,         void,           reboot, void, 1),
+  PROC(none,            void,           void,           void,   void, 1),
+  PROC(none,            void,           void,           void,   void, 1),
+  PROC(none,            void,           void,           void,   void, 1),
+  PROC(share,           shareargs,      shareres,       args,   res, Ck+St+1),
+  PROC(unshare,         shareargs,      shareres,       args,   res, Ck+St+1),
+  PROC(nm_lock,         lockargs,       res,            args,   res, Ck+St),
+  PROC(free_all,        notify,         void,           args,   void, 0),
+
+};