| /* |
| * linux/fs/lockd/svc4proc.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/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 |
| |
| /* |
| * Obtain client and file from arguments |
| */ |
| static u32 |
| nlm4svc_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 = 0; |
| |
| /* 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, lock->caller, lock->len)) |
| || (argp->monitor && 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); |
| if (error) |
| return error; |
| return nlm_lck_denied_nolocks; |
| } |
| |
| /* |
| * NULL: Test for presence of service |
| */ |
| static __be32 |
| nlm4svc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) |
| { |
| dprintk("lockd: NULL called\n"); |
| return rpc_success; |
| } |
| |
| /* |
| * TEST: Check for conflicting lock |
| */ |
| static __be32 |
| nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp, |
| struct nlm_res *resp) |
| { |
| struct nlm_host *host; |
| struct nlm_file *file; |
| |
| dprintk("lockd: TEST4 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 = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) |
| return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; |
| |
| /* Now check for conflicting locks */ |
| resp->status = nlmsvc_testlock(file, &argp->lock, &resp->lock); |
| |
| dprintk("lockd: TEST4 status %d\n", ntohl(resp->status)); |
| nlm_release_host(host); |
| nlm_release_file(file); |
| return rpc_success; |
| } |
| |
| static __be32 |
| nlm4svc_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 = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) |
| return resp->status == nlm_drop_reply ? rpc_drop_reply :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 = 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 __be32 |
| nlm4svc_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 = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) |
| return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; |
| |
| /* Try to cancel request. */ |
| resp->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 __be32 |
| nlm4svc_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 = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) |
| return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; |
| |
| /* Now try to remove the lock */ |
| resp->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 __be32 |
| nlm4svc_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(&rqstp->rq_addr, &argp->lock); |
| dprintk("lockd: GRANTED status %d\n", ntohl(resp->status)); |
| return rpc_success; |
| } |
| |
| /* |
| * This is the generic lockd callback for async RPC calls |
| */ |
| static void nlm4svc_callback_exit(struct rpc_task *task, void *data) |
| { |
| dprintk("lockd: %4d callback returned %d\n", task->tk_pid, |
| -task->tk_status); |
| } |
| |
| static void nlm4svc_callback_release(void *data) |
| { |
| nlm_release_call(data); |
| } |
| |
| static const struct rpc_call_ops nlm4svc_callback_ops = { |
| .rpc_call_done = nlm4svc_callback_exit, |
| .rpc_release = nlm4svc_callback_release, |
| }; |
| |
| /* |
| * `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 __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp, |
| __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *)) |
| { |
| struct nlm_host *host; |
| struct nlm_rqst *call; |
| __be32 stat; |
| |
| host = nlmsvc_lookup_host(rqstp, |
| argp->lock.caller, |
| argp->lock.len); |
| if (host == NULL) |
| return rpc_system_err; |
| |
| call = nlm_alloc_call(host); |
| if (call == NULL) |
| return rpc_system_err; |
| |
| stat = func(rqstp, argp, &call->a_res); |
| if (stat != 0) { |
| nlm_release_call(call); |
| return stat; |
| } |
| |
| call->a_flags = RPC_TASK_ASYNC; |
| if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0) |
| return rpc_system_err; |
| return rpc_success; |
| } |
| |
| static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp, |
| void *resp) |
| { |
| dprintk("lockd: TEST_MSG called\n"); |
| return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test); |
| } |
| |
| static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, |
| void *resp) |
| { |
| dprintk("lockd: LOCK_MSG called\n"); |
| return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock); |
| } |
| |
| static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp, |
| void *resp) |
| { |
| dprintk("lockd: CANCEL_MSG called\n"); |
| return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel); |
| } |
| |
| static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, |
| void *resp) |
| { |
| dprintk("lockd: UNLOCK_MSG called\n"); |
| return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock); |
| } |
| |
| static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp, |
| void *resp) |
| { |
| dprintk("lockd: GRANTED_MSG called\n"); |
| return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted); |
| } |
| |
| /* |
| * SHARE: create a DOS share or alter existing share. |
| */ |
| static __be32 |
| nlm4svc_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 = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) |
| return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; |
| |
| /* Now try to create the share */ |
| resp->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 __be32 |
| nlm4svc_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 = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) |
| return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; |
| |
| /* Now try to lock the file */ |
| resp->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 __be32 |
| nlm4svc_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 nlm4svc_proc_lock(rqstp, argp, resp); |
| } |
| |
| /* |
| * FREE_ALL: Release all locks and shares held by client |
| */ |
| static __be32 |
| nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp, |
| void *resp) |
| { |
| struct nlm_host *host; |
| |
| /* Obtain client */ |
| if (nlm4svc_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 __be32 |
| nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp, |
| void *resp) |
| { |
| struct sockaddr_in saddr = rqstp->rq_addr; |
| |
| 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. |
| */ |
| memset(&saddr, 0, sizeof(saddr)); |
| saddr.sin_addr.s_addr = argp->addr; |
| nlm_host_rebooted(&saddr, argp->mon, argp->len, argp->state); |
| |
| return rpc_success; |
| } |
| |
| /* |
| * client sent a GRANTED_RES, let's remove the associated block |
| */ |
| static __be32 |
| nlm4svc_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(&argp->cookie, argp->status); |
| return rpc_success; |
| } |
| |
| |
| /* |
| * NLM Server procedures. |
| */ |
| |
| #define nlm4svc_encode_norep nlm4svc_encode_void |
| #define nlm4svc_decode_norep nlm4svc_decode_void |
| #define nlm4svc_decode_testres nlm4svc_decode_void |
| #define nlm4svc_decode_lockres nlm4svc_decode_void |
| #define nlm4svc_decode_unlockres nlm4svc_decode_void |
| #define nlm4svc_decode_cancelres nlm4svc_decode_void |
| #define nlm4svc_decode_grantedres nlm4svc_decode_void |
| |
| #define nlm4svc_proc_none nlm4svc_proc_null |
| #define nlm4svc_proc_test_res nlm4svc_proc_null |
| #define nlm4svc_proc_lock_res nlm4svc_proc_null |
| #define nlm4svc_proc_cancel_res nlm4svc_proc_null |
| #define nlm4svc_proc_unlock_res nlm4svc_proc_null |
| |
| struct nlm_void { int dummy; }; |
| |
| #define PROC(name, xargt, xrest, argt, rest, respsize) \ |
| { .pc_func = (svc_procfunc) nlm4svc_proc_##name, \ |
| .pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \ |
| .pc_encode = (kxdrproc_t) nlm4svc_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 No (1+1024/4) /* netobj */ |
| #define St 1 /* status */ |
| #define Rg 4 /* range (offset + length) */ |
| struct svc_procedure nlmsvc_procedures4[] = { |
| 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, 0), |
| PROC(none, void, void, void, void, 0), |
| PROC(none, void, void, void, void, 0), |
| 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, 1), |
| |
| }; |