diff options
Diffstat (limited to 'fs/nfs/nfs4client.c')
| -rw-r--r-- | fs/nfs/nfs4client.c | 428 |
1 files changed, 428 insertions, 0 deletions
diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c index c5234b589907..a71d95ecbea9 100644 --- a/fs/nfs/nfs4client.c +++ b/fs/nfs/nfs4client.c @@ -2,17 +2,27 @@ * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) */ +#include <linux/module.h> #include <linux/nfs_fs.h> #include <linux/nfs_idmap.h> +#include <linux/nfs_mount.h> #include <linux/sunrpc/auth.h> #include <linux/sunrpc/xprt.h> #include <linux/sunrpc/bc_xprt.h> #include "internal.h" #include "callback.h" +#include "delegation.h" +#include "pnfs.h" +#include "netns.h" #define NFSDBG_FACILITY NFSDBG_CLIENT /* + * Turn off NFSv4 uid/gid mapping when using AUTH_SYS + */ +static bool nfs4_disable_idmapping = true; + +/* * Initialize the NFS4 callback service */ static int nfs4_init_callback(struct nfs_client *clp) @@ -142,3 +152,421 @@ error: dprintk("<-- nfs4_init_client() = xerror %d\n", error); return ERR_PTR(error); } + +static void nfs4_destroy_server(struct nfs_server *server) +{ + nfs_server_return_all_delegations(server); + unset_pnfs_layoutdriver(server); + nfs4_purge_state_owners(server); +} + +/* + * NFSv4.0 callback thread helper + * + * Find a client by callback identifier + */ +struct nfs_client * +nfs4_find_client_ident(struct net *net, int cb_ident) +{ + struct nfs_client *clp; + struct nfs_net *nn = net_generic(net, nfs_net_id); + + spin_lock(&nn->nfs_client_lock); + clp = idr_find(&nn->cb_ident_idr, cb_ident); + if (clp) + atomic_inc(&clp->cl_count); + spin_unlock(&nn->nfs_client_lock); + return clp; +} + +#if defined(CONFIG_NFS_V4_1) +/* Common match routine for v4.0 and v4.1 callback services */ +static bool nfs4_cb_match_client(const struct sockaddr *addr, + struct nfs_client *clp, u32 minorversion) +{ + struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; + + /* Don't match clients that failed to initialise */ + if (!(clp->cl_cons_state == NFS_CS_READY || + clp->cl_cons_state == NFS_CS_SESSION_INITING)) + return false; + + smp_rmb(); + + /* Match the version and minorversion */ + if (clp->rpc_ops->version != 4 || + clp->cl_minorversion != minorversion) + return false; + + /* Match only the IP address, not the port number */ + if (!nfs_sockaddr_match_ipaddr(addr, clap)) + return false; + + return true; +} + +/* + * NFSv4.1 callback thread helper + * For CB_COMPOUND calls, find a client by IP address, protocol version, + * minorversion, and sessionID + * + * Returns NULL if no such client + */ +struct nfs_client * +nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, + struct nfs4_sessionid *sid) +{ + struct nfs_client *clp; + struct nfs_net *nn = net_generic(net, nfs_net_id); + + spin_lock(&nn->nfs_client_lock); + list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { + if (nfs4_cb_match_client(addr, clp, 1) == false) + continue; + + if (!nfs4_has_session(clp)) + continue; + + /* Match sessionid*/ + if (memcmp(clp->cl_session->sess_id.data, + sid->data, NFS4_MAX_SESSIONID_LEN) != 0) + continue; + + atomic_inc(&clp->cl_count); + spin_unlock(&nn->nfs_client_lock); + return clp; + } + spin_unlock(&nn->nfs_client_lock); + return NULL; +} + +#else /* CONFIG_NFS_V4_1 */ + +struct nfs_client * +nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, + struct nfs4_sessionid *sid) +{ + return NULL; +} +#endif /* CONFIG_NFS_V4_1 */ + +/* + * Set up an NFS4 client + */ +static int nfs4_set_client(struct nfs_server *server, + const char *hostname, + const struct sockaddr *addr, + const size_t addrlen, + const char *ip_addr, + rpc_authflavor_t authflavour, + int proto, const struct rpc_timeout *timeparms, + u32 minorversion, struct net *net) +{ + struct nfs_client_initdata cl_init = { + .hostname = hostname, + .addr = addr, + .addrlen = addrlen, + .rpc_ops = &nfs_v4_clientops, + .proto = proto, + .minorversion = minorversion, + .net = net, + }; + struct nfs_client *clp; + int error; + + dprintk("--> nfs4_set_client()\n"); + + if (server->flags & NFS_MOUNT_NORESVPORT) + set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); + + /* Allocate or find a client reference we can use */ + clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour); + if (IS_ERR(clp)) { + error = PTR_ERR(clp); + goto error; + } + + /* + * Query for the lease time on clientid setup or renewal + * + * Note that this will be set on nfs_clients that were created + * only for the DS role and did not set this bit, but now will + * serve a dual role. + */ + set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state); + + server->nfs_client = clp; + dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); + return 0; +error: + dprintk("<-- nfs4_set_client() = xerror %d\n", error); + return error; +} + +/* + * Set up a pNFS Data Server client. + * + * Return any existing nfs_client that matches server address,port,version + * and minorversion. + * + * For a new nfs_client, use a soft mount (default), a low retrans and a + * low timeout interval so that if a connection is lost, we retry through + * the MDS. + */ +struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp, + const struct sockaddr *ds_addr, int ds_addrlen, + int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans) +{ + struct nfs_client_initdata cl_init = { + .addr = ds_addr, + .addrlen = ds_addrlen, + .rpc_ops = &nfs_v4_clientops, + .proto = ds_proto, + .minorversion = mds_clp->cl_minorversion, + .net = mds_clp->cl_net, + }; + struct rpc_timeout ds_timeout; + struct nfs_client *clp; + + /* + * Set an authflavor equual to the MDS value. Use the MDS nfs_client + * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS + * (section 13.1 RFC 5661). + */ + nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans); + clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr, + mds_clp->cl_rpcclient->cl_auth->au_flavor); + + dprintk("<-- %s %p\n", __func__, clp); + return clp; +} +EXPORT_SYMBOL_GPL(nfs4_set_ds_client); + +/* + * Session has been established, and the client marked ready. + * Set the mount rsize and wsize with negotiated fore channel + * attributes which will be bound checked in nfs_server_set_fsinfo. + */ +static void nfs4_session_set_rwsize(struct nfs_server *server) +{ +#ifdef CONFIG_NFS_V4_1 + struct nfs4_session *sess; + u32 server_resp_sz; + u32 server_rqst_sz; + + if (!nfs4_has_session(server->nfs_client)) + return; + sess = server->nfs_client->cl_session; + server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead; + server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead; + + if (server->rsize > server_resp_sz) + server->rsize = server_resp_sz; + if (server->wsize > server_rqst_sz) + server->wsize = server_rqst_sz; +#endif /* CONFIG_NFS_V4_1 */ +} + +static int nfs4_server_common_setup(struct nfs_server *server, + struct nfs_fh *mntfh) +{ + struct nfs_fattr *fattr; + int error; + + BUG_ON(!server->nfs_client); + BUG_ON(!server->nfs_client->rpc_ops); + BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); + + /* data servers support only a subset of NFSv4.1 */ + if (is_ds_only_client(server->nfs_client)) + return -EPROTONOSUPPORT; + + fattr = nfs_alloc_fattr(); + if (fattr == NULL) + return -ENOMEM; + + /* We must ensure the session is initialised first */ + error = nfs4_init_session(server); + if (error < 0) + goto out; + + /* Probe the root fh to retrieve its FSID and filehandle */ + error = nfs4_get_rootfh(server, mntfh); + if (error < 0) + goto out; + + dprintk("Server FSID: %llx:%llx\n", + (unsigned long long) server->fsid.major, + (unsigned long long) server->fsid.minor); + dprintk("Mount FH: %d\n", mntfh->size); + + nfs4_session_set_rwsize(server); + + error = nfs_probe_fsinfo(server, mntfh, fattr); + if (error < 0) + goto out; + + if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) + server->namelen = NFS4_MAXNAMLEN; + + nfs_server_insert_lists(server); + server->mount_time = jiffies; + server->destroy = nfs4_destroy_server; +out: + nfs_free_fattr(fattr); + return error; +} + +/* + * Create a version 4 volume record + */ +static int nfs4_init_server(struct nfs_server *server, + const struct nfs_parsed_mount_data *data) +{ + struct rpc_timeout timeparms; + int error; + + dprintk("--> nfs4_init_server()\n"); + + nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, + data->timeo, data->retrans); + + /* Initialise the client representation from the mount data */ + server->flags = data->flags; + server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK; + if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) + server->caps |= NFS_CAP_READDIRPLUS; + server->options = data->options; + + /* Get a client record */ + error = nfs4_set_client(server, + data->nfs_server.hostname, + (const struct sockaddr *)&data->nfs_server.address, + data->nfs_server.addrlen, + data->client_address, + data->auth_flavors[0], + data->nfs_server.protocol, + &timeparms, + data->minorversion, + data->net); + if (error < 0) + goto error; + + /* + * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower + * authentication. + */ + if (nfs4_disable_idmapping && data->auth_flavors[0] == RPC_AUTH_UNIX) + server->caps |= NFS_CAP_UIDGID_NOMAP; + + if (data->rsize) + server->rsize = nfs_block_size(data->rsize, NULL); + if (data->wsize) + server->wsize = nfs_block_size(data->wsize, NULL); + + server->acregmin = data->acregmin * HZ; + server->acregmax = data->acregmax * HZ; + server->acdirmin = data->acdirmin * HZ; + server->acdirmax = data->acdirmax * HZ; + + server->port = data->nfs_server.port; + + error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); + +error: + /* Done */ + dprintk("<-- nfs4_init_server() = %d\n", error); + return error; +} + +/* + * Create a version 4 volume record + * - keyed on server and FSID + */ +struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, + struct nfs_fh *mntfh) +{ + struct nfs_server *server; + int error; + + dprintk("--> nfs4_create_server()\n"); + + server = nfs_alloc_server(); + if (!server) + return ERR_PTR(-ENOMEM); + + /* set up the general RPC client */ + error = nfs4_init_server(server, data); + if (error < 0) + goto error; + + error = nfs4_server_common_setup(server, mntfh); + if (error < 0) + goto error; + + dprintk("<-- nfs4_create_server() = %p\n", server); + return server; + +error: + nfs_free_server(server); + dprintk("<-- nfs4_create_server() = error %d\n", error); + return ERR_PTR(error); +} + +/* + * Create an NFS4 referral server record + */ +struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, + struct nfs_fh *mntfh) +{ + struct nfs_client *parent_client; + struct nfs_server *server, *parent_server; + int error; + + dprintk("--> nfs4_create_referral_server()\n"); + + server = nfs_alloc_server(); + if (!server) + return ERR_PTR(-ENOMEM); + + parent_server = NFS_SB(data->sb); + parent_client = parent_server->nfs_client; + + /* Initialise the client representation from the parent server */ + nfs_server_copy_userdata(server, parent_server); + server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR; + + /* Get a client representation. + * Note: NFSv4 always uses TCP, */ + error = nfs4_set_client(server, data->hostname, + data->addr, + data->addrlen, + parent_client->cl_ipaddr, + data->authflavor, + rpc_protocol(parent_server->client), + parent_server->client->cl_timeout, + parent_client->cl_mvops->minor_version, + parent_client->cl_net); + if (error < 0) + goto error; + + error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); + if (error < 0) + goto error; + + error = nfs4_server_common_setup(server, mntfh); + if (error < 0) + goto error; + + dprintk("<-- nfs_create_referral_server() = %p\n", server); + return server; + +error: + nfs_free_server(server); + dprintk("<-- nfs4_create_referral_server() = error %d\n", error); + return ERR_PTR(error); +} + +module_param(nfs4_disable_idmapping, bool, 0644); +MODULE_PARM_DESC(nfs4_disable_idmapping, + "Turn off NFSv4 idmapping when using 'sec=sys'"); |