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NFS: Add nfs4_update_server
New function nfs4_update_server() moves an nfs_server to a different nfs_client. This is done as part of migration recovery. Though it may be appealing to think of them as the same thing, migration recovery is not the same as following a referral. For a referral, the client has not descended into the file system yet: it has no nfs_server, no super block, no inodes or open state. It is enough to simply instantiate the nfs_server and super block, and perform a referral mount. For a migration, however, we have all of those things already, and they have to be moved to a different nfs_client. No local namespace changes are needed here. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
parent
40b00b6b17
commit
32e62b7c3e
3 changed files with 113 additions and 1 deletions
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@ -945,7 +945,7 @@ void nfs_server_insert_lists(struct nfs_server *server)
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}
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EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
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static void nfs_server_remove_lists(struct nfs_server *server)
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void nfs_server_remove_lists(struct nfs_server *server)
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{
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struct nfs_client *clp = server->nfs_client;
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struct nfs_net *nn;
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@ -962,6 +962,7 @@ static void nfs_server_remove_lists(struct nfs_server *server)
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synchronize_rcu();
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}
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EXPORT_SYMBOL_GPL(nfs_server_remove_lists);
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/*
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* Allocate and initialise a server record
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@ -154,6 +154,7 @@ struct nfs_client *nfs_get_client(const struct nfs_client_initdata *,
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rpc_authflavor_t);
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int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
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void nfs_server_insert_lists(struct nfs_server *);
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void nfs_server_remove_lists(struct nfs_server *);
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void nfs_init_timeout_values(struct rpc_timeout *, int, unsigned int, unsigned int);
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int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
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rpc_authflavor_t);
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@ -174,6 +175,8 @@ extern struct nfs_server *nfs4_create_server(
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struct nfs_subversion *);
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extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
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struct nfs_fh *);
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extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
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struct sockaddr *sap, size_t salen);
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extern void nfs_free_server(struct nfs_server *server);
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extern struct nfs_server *nfs_clone_server(struct nfs_server *,
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struct nfs_fh *,
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@ -1092,3 +1092,111 @@ struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
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dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
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return ERR_PTR(error);
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}
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/*
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* Grab the destination's particulars, including lease expiry time.
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*
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* Returns zero if probe succeeded and retrieved FSID matches the FSID
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* we have cached.
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*/
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static int nfs_probe_destination(struct nfs_server *server)
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{
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struct inode *inode = server->super->s_root->d_inode;
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struct nfs_fattr *fattr;
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int error;
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fattr = nfs_alloc_fattr();
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if (fattr == NULL)
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return -ENOMEM;
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/* Sanity: the probe won't work if the destination server
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* does not recognize the migrated FH. */
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error = nfs_probe_fsinfo(server, NFS_FH(inode), fattr);
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nfs_free_fattr(fattr);
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return error;
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}
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/**
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* nfs4_update_server - Move an nfs_server to a different nfs_client
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*
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* @server: represents FSID to be moved
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* @hostname: new end-point's hostname
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* @sap: new end-point's socket address
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* @salen: size of "sap"
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*
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* The nfs_server must be quiescent before this function is invoked.
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* Either its session is drained (NFSv4.1+), or its transport is
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* plugged and drained (NFSv4.0).
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*
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* Returns zero on success, or a negative errno value.
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*/
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int nfs4_update_server(struct nfs_server *server, const char *hostname,
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struct sockaddr *sap, size_t salen)
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{
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struct nfs_client *clp = server->nfs_client;
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struct rpc_clnt *clnt = server->client;
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struct xprt_create xargs = {
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.ident = clp->cl_proto,
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.net = &init_net,
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.dstaddr = sap,
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.addrlen = salen,
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.servername = hostname,
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};
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char buf[INET6_ADDRSTRLEN + 1];
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struct sockaddr_storage address;
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struct sockaddr *localaddr = (struct sockaddr *)&address;
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int error;
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dprintk("--> %s: move FSID %llx:%llx to \"%s\")\n", __func__,
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(unsigned long long)server->fsid.major,
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(unsigned long long)server->fsid.minor,
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hostname);
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error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout);
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if (error != 0) {
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dprintk("<-- %s(): rpc_switch_client_transport returned %d\n",
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__func__, error);
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goto out;
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}
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error = rpc_localaddr(clnt, localaddr, sizeof(address));
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if (error != 0) {
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dprintk("<-- %s(): rpc_localaddr returned %d\n",
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__func__, error);
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goto out;
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}
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error = -EAFNOSUPPORT;
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if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0) {
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dprintk("<-- %s(): rpc_ntop returned %d\n",
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__func__, error);
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goto out;
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}
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nfs_server_remove_lists(server);
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error = nfs4_set_client(server, hostname, sap, salen, buf,
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clp->cl_rpcclient->cl_auth->au_flavor,
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clp->cl_proto, clnt->cl_timeout,
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clp->cl_minorversion, clp->cl_net);
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nfs_put_client(clp);
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if (error != 0) {
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nfs_server_insert_lists(server);
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dprintk("<-- %s(): nfs4_set_client returned %d\n",
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__func__, error);
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goto out;
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}
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if (server->nfs_client->cl_hostname == NULL)
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server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL);
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nfs_server_insert_lists(server);
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error = nfs_probe_destination(server);
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if (error < 0)
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goto out;
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dprintk("<-- %s() succeeded\n", __func__);
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out:
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return error;
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}
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