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-rw-r--r--fs/lockd/svcproc.c606
1 files changed, 606 insertions, 0 deletions
diff --git a/fs/lockd/svcproc.c b/fs/lockd/svcproc.c
new file mode 100644
index 00000000000..757e344cf20
--- /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),
+
+};
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-26 20:26:36 +0000