nfs4client.c

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/*
 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 */
#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

/*
 * Get a unique NFSv4.0 callback identifier which will be used
 * by the V4.0 callback service to lookup the nfs_client struct
 */
static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
{
    int ret = 0;
    struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);

    if (clp->rpc_ops->version != 4 || minorversion != 0)
        return ret;
retry:
    if (!idr_pre_get(&nn->cb_ident_idr, GFP_KERNEL))
        return -ENOMEM;
    spin_lock(&nn->nfs_client_lock);
    ret = idr_get_new(&nn->cb_ident_idr, clp, &clp->cl_cb_ident);
    spin_unlock(&nn->nfs_client_lock);
    if (ret == -EAGAIN)
        goto retry;
    return ret;
}

#ifdef CONFIG_NFS_V4_1
static void nfs4_shutdown_session(struct nfs_client *clp)
{
    if (nfs4_has_session(clp)) {
        nfs4_destroy_session(clp->cl_session);
        nfs4_destroy_clientid(clp);
    }

}
#else /* CONFIG_NFS_V4_1 */
static void nfs4_shutdown_session(struct nfs_client *clp)
{
}
#endif /* CONFIG_NFS_V4_1 */

struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
{
    int err;
    struct nfs_client *clp = nfs_alloc_client(cl_init);
    if (IS_ERR(clp))
        return clp;

    err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
    if (err)
        goto error;

    spin_lock_init(&clp->cl_lock);
    INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
    rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
    clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
    clp->cl_minorversion = cl_init->minorversion;
    clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
    return clp;

error:
    nfs_free_client(clp);
    return ERR_PTR(err);
}

/*
 * Destroy the NFS4 callback service
 */
static void nfs4_destroy_callback(struct nfs_client *clp)
{
    if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
        nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
}

static void nfs4_shutdown_client(struct nfs_client *clp)
{
    if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
        nfs4_kill_renewd(clp);
    nfs4_shutdown_session(clp);
    nfs4_destroy_callback(clp);
    if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
        nfs_idmap_delete(clp);

    rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
    kfree(clp->cl_serverowner);
    kfree(clp->cl_serverscope);
    kfree(clp->cl_implid);
}

void nfs4_free_client(struct nfs_client *clp)
{
    nfs4_shutdown_client(clp);
    nfs_free_client(clp);
}

/*
 * Initialize the NFS4 callback service
 */
static int nfs4_init_callback(struct nfs_client *clp)
{
    int error;

    if (clp->rpc_ops->version == 4) {
        struct rpc_xprt *xprt;

        xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);

        if (nfs4_has_session(clp)) {
            error = xprt_setup_backchannel(xprt,
                        NFS41_BC_MIN_CALLBACKS);
            if (error < 0)
                return error;
        }

        error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
        if (error < 0) {
            dprintk("%s: failed to start callback. Error = %d\n",
                __func__, error);
            return error;
        }
        __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
    }
    return 0;
}

/*
 * Initialize the minor version specific parts of an NFS4 client record
 */
static int nfs4_init_client_minor_version(struct nfs_client *clp)
{
#if defined(CONFIG_NFS_V4_1)
    if (clp->cl_mvops->minor_version) {
        struct nfs4_session *session = NULL;
        /*
         * Create the session and mark it expired.
         * When a SEQUENCE operation encounters the expired session
         * it will do session recovery to initialize it.
         */
        session = nfs4_alloc_session(clp);
        if (!session)
            return -ENOMEM;

        clp->cl_session = session;
        /*
         * The create session reply races with the server back
         * channel probe. Mark the client NFS_CS_SESSION_INITING
         * so that the client back channel can find the
         * nfs_client struct
         */
        nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
    }
#endif /* CONFIG_NFS_V4_1 */

    return nfs4_init_callback(clp);
}

struct nfs_client *nfs4_init_client(struct nfs_client *clp,
                    const struct rpc_timeout *timeparms,
                    const char *ip_addr,
                    rpc_authflavor_t authflavour)
{
    char buf[INET6_ADDRSTRLEN + 1];
    struct nfs_client *old;
    int error;

    if (clp->cl_cons_state == NFS_CS_READY) {
        /* the client is initialised already */
        dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
        return clp;
    }

    /* Check NFS protocol revision and initialize RPC op vector */
    clp->rpc_ops = &nfs_v4_clientops;

    __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
    error = nfs_create_rpc_client(clp, timeparms, authflavour);
    if (error < 0)
        goto error;

    /* If no clientaddr= option was specified, find a usable cb address */
    if (ip_addr == NULL) {
        struct sockaddr_storage cb_addr;
        struct sockaddr *sap = (struct sockaddr *)&cb_addr;

        error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
        if (error < 0)
            goto error;
        error = rpc_ntop(sap, buf, sizeof(buf));
        if (error < 0)
            goto error;
        ip_addr = (const char *)buf;
    }
    strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));

    error = nfs_idmap_new(clp);
    if (error < 0) {
        dprintk("%s: failed to create idmapper. Error = %d\n",
            __func__, error);
        goto error;
    }
    __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);

    error = nfs4_init_client_minor_version(clp);
    if (error < 0)
        goto error;

    if (!nfs4_has_session(clp))
        nfs_mark_client_ready(clp, NFS_CS_READY);

    error = nfs4_discover_server_trunking(clp, &old);
    if (error < 0)
        goto error;
    if (clp != old) {
        clp->cl_preserve_clid = true;
        nfs_put_client(clp);
        clp = old;
        atomic_inc(&clp->cl_count);
    }

    return clp;

error:
    nfs_mark_client_ready(clp, error);
    nfs_put_client(clp);
    dprintk("<-- nfs4_init_client() = xerror %d\n", error);
    return ERR_PTR(error);
}

/*
 * SETCLIENTID just did a callback update with the callback ident in
 * "drop," but server trunking discovery claims "drop" and "keep" are
 * actually the same server.  Swap the callback IDs so that "keep"
 * will continue to use the callback ident the server now knows about,
 * and so that "keep"'s original callback ident is destroyed when
 * "drop" is freed.
 */
static void nfs4_swap_callback_idents(struct nfs_client *keep,
                      struct nfs_client *drop)
{
    struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
    unsigned int save = keep->cl_cb_ident;

    if (keep->cl_cb_ident == drop->cl_cb_ident)
        return;

    dprintk("%s: keeping callback ident %u and dropping ident %u\n",
        __func__, keep->cl_cb_ident, drop->cl_cb_ident);

    spin_lock(&nn->nfs_client_lock);

    idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
    keep->cl_cb_ident = drop->cl_cb_ident;

    idr_replace(&nn->cb_ident_idr, drop, save);
    drop->cl_cb_ident = save;

    spin_unlock(&nn->nfs_client_lock);
}

int nfs40_walk_client_list(struct nfs_client *new,
               struct nfs_client **result,
               struct rpc_cred *cred)
{
    struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
    struct nfs_client *pos, *n, *prev = NULL;
    struct nfs4_setclientid_res clid = {
        .clientid   = new->cl_clientid,
        .confirm    = new->cl_confirm,
    };
    int status;

    spin_lock(&nn->nfs_client_lock);
    list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) {
        /* If "pos" isn't marked ready, we can't trust the
         * remaining fields in "pos" */
        if (pos->cl_cons_state < NFS_CS_READY)
            continue;

        if (pos->rpc_ops != new->rpc_ops)
            continue;

        if (pos->cl_proto != new->cl_proto)
            continue;

        if (pos->cl_minorversion != new->cl_minorversion)
            continue;

        if (pos->cl_clientid != new->cl_clientid)
            continue;

        atomic_inc(&pos->cl_count);
        spin_unlock(&nn->nfs_client_lock);

        if (prev)
            nfs_put_client(prev);

        status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
        if (status == 0) {
            nfs4_swap_callback_idents(pos, new);

            nfs_put_client(pos);
            *result = pos;
            dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
                __func__, pos, atomic_read(&pos->cl_count));
            return 0;
        }
        if (status != -NFS4ERR_STALE_CLIENTID) {
            nfs_put_client(pos);
            dprintk("NFS: <-- %s status = %d, no result\n",
                __func__, status);
            return status;
        }

        spin_lock(&nn->nfs_client_lock);
        prev = pos;
    }

    /*
     * No matching nfs_client found.  This should be impossible,
     * because the new nfs_client has already been added to
     * nfs_client_list by nfs_get_client().
     *
     * Don't BUG(), since the caller is holding a mutex.
     */
    if (prev)
        nfs_put_client(prev);
    spin_unlock(&nn->nfs_client_lock);
    pr_err("NFS: %s Error: no matching nfs_client found\n", __func__);
    return -NFS4ERR_STALE_CLIENTID;
}

#ifdef CONFIG_NFS_V4_1
/*
 * Returns true if the client IDs match
 */
static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b)
{
    if (a->cl_clientid != b->cl_clientid) {
        dprintk("NFS: --> %s client ID %llx does not match %llx\n",
            __func__, a->cl_clientid, b->cl_clientid);
        return false;
    }
    dprintk("NFS: --> %s client ID %llx matches %llx\n",
        __func__, a->cl_clientid, b->cl_clientid);
    return true;
}

/*
 * Returns true if the server owners match
 */
static bool
nfs4_match_serverowners(struct nfs_client *a, struct nfs_client *b)
{
    struct nfs41_server_owner *o1 = a->cl_serverowner;
    struct nfs41_server_owner *o2 = b->cl_serverowner;

    if (o1->minor_id != o2->minor_id) {
        dprintk("NFS: --> %s server owner minor IDs do not match\n",
            __func__);
        return false;
    }

    if (o1->major_id_sz != o2->major_id_sz)
        goto out_major_mismatch;
    if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
        goto out_major_mismatch;

    dprintk("NFS: --> %s server owners match\n", __func__);
    return true;

out_major_mismatch:
    dprintk("NFS: --> %s server owner major IDs do not match\n",
        __func__);
    return false;
}

int nfs41_walk_client_list(struct nfs_client *new,
               struct nfs_client **result,
               struct rpc_cred *cred)
{
    struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
    struct nfs_client *pos, *n, *prev = NULL;
    int error;

    spin_lock(&nn->nfs_client_lock);
    list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) {
        /* If "pos" isn't marked ready, we can't trust the
         * remaining fields in "pos", especially the client
         * ID and serverowner fields.  Wait for CREATE_SESSION
         * to finish. */
        if (pos->cl_cons_state < NFS_CS_READY) {
            atomic_inc(&pos->cl_count);
            spin_unlock(&nn->nfs_client_lock);

            if (prev)
                nfs_put_client(prev);
            prev = pos;

            error = nfs_wait_client_init_complete(pos);
            if (error < 0) {
                nfs_put_client(pos);
                spin_lock(&nn->nfs_client_lock);
                continue;
            }

            spin_lock(&nn->nfs_client_lock);
        }

        if (pos->rpc_ops != new->rpc_ops)
            continue;

        if (pos->cl_proto != new->cl_proto)
            continue;

        if (pos->cl_minorversion != new->cl_minorversion)
            continue;

        if (!nfs4_match_clientids(pos, new))
            continue;

        if (!nfs4_match_serverowners(pos, new))
            continue;

        spin_unlock(&nn->nfs_client_lock);
        dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
            __func__, pos, atomic_read(&pos->cl_count));

        *result = pos;
        return 0;
    }

    /*
     * No matching nfs_client found.  This should be impossible,
     * because the new nfs_client has already been added to
     * nfs_client_list by nfs_get_client().
     *
     * Don't BUG(), since the caller is holding a mutex.
     */
    spin_unlock(&nn->nfs_client_lock);
    pr_err("NFS: %s Error: no matching nfs_client found\n", __func__);
    return -NFS4ERR_STALE_CLIENTID;
}
#endif  /* CONFIG_NFS_V4_1 */

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,
        .nfs_mod = &nfs_v4,
        .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,
        .nfs_mod = &nfs_v4,
        .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 *nfs4_create_server(struct nfs_mount_info *mount_info,
                      struct nfs_subversion *nfs_mod)
{
    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, mount_info->parsed);
    if (error < 0)
        goto error;

    error = nfs4_server_common_setup(server, mount_info->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);
}