1 files changed, 843 insertions, 0 deletions

diff --git a/fs/nfs/filelayout/filelayoutdev.c b/fs/nfs/filelayout/filelayoutdev.c
new file mode 100644
index 000000000000..44bf0140a4c7
--- /dev/null
+++ b/fs/nfs/filelayout/filelayoutdev.c
@@ -0,0 +1,843 @@
+/*
+ *  Device operations for the pnfs nfs4 file layout driver.
+ *
+ *  Copyright (c) 2002
+ *  The Regents of the University of Michigan
+ *  All Rights Reserved
+ *
+ *  Dean Hildebrand <dhildebz@umich.edu>
+ *  Garth Goodson   <Garth.Goodson@netapp.com>
+ *
+ *  Permission is granted to use, copy, create derivative works, and
+ *  redistribute this software and such derivative works for any purpose,
+ *  so long as the name of the University of Michigan is not used in
+ *  any advertising or publicity pertaining to the use or distribution
+ *  of this software without specific, written prior authorization. If
+ *  the above copyright notice or any other identification of the
+ *  University of Michigan is included in any copy of any portion of
+ *  this software, then the disclaimer below must also be included.
+ *
+ *  This software is provided as is, without representation or warranty
+ *  of any kind either express or implied, including without limitation
+ *  the implied warranties of merchantability, fitness for a particular
+ *  purpose, or noninfringement.  The Regents of the University of
+ *  Michigan shall not be liable for any damages, including special,
+ *  indirect, incidental, or consequential damages, with respect to any
+ *  claim arising out of or in connection with the use of the software,
+ *  even if it has been or is hereafter advised of the possibility of
+ *  such damages.
+ */
+
+#include <linux/nfs_fs.h>
+#include <linux/vmalloc.h>
+#include <linux/module.h>
+#include <linux/sunrpc/addr.h>
+
+#include "../internal.h"
+#include "../nfs4session.h"
+#include "filelayout.h"
+
+#define NFSDBG_FACILITY         NFSDBG_PNFS_LD
+
+static unsigned int dataserver_timeo = NFS4_DEF_DS_TIMEO;
+static unsigned int dataserver_retrans = NFS4_DEF_DS_RETRANS;
+
+/*
+ * Data server cache
+ *
+ * Data servers can be mapped to different device ids.
+ * nfs4_pnfs_ds reference counting
+ *   - set to 1 on allocation
+ *   - incremented when a device id maps a data server already in the cache.
+ *   - decremented when deviceid is removed from the cache.
+ */
+static DEFINE_SPINLOCK(nfs4_ds_cache_lock);
+static LIST_HEAD(nfs4_data_server_cache);
+
+/* Debug routines */
+void
+print_ds(struct nfs4_pnfs_ds *ds)
+{
+        if (ds == NULL) {
+                printk("%s NULL device\n", __func__);
+                return;
+        }
+        printk("        ds %s\n"
+                "        ref count %d\n"
+                "        client %p\n"
+                "        cl_exchange_flags %x\n",
+                ds->ds_remotestr,
+                atomic_read(&ds->ds_count), ds->ds_clp,
+                ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0);
+}
+
+static bool
+same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2)
+{
+        struct sockaddr_in *a, *b;
+        struct sockaddr_in6 *a6, *b6;
+
+        if (addr1->sa_family != addr2->sa_family)
+                return false;
+
+        switch (addr1->sa_family) {
+        case AF_INET:
+                a = (struct sockaddr_in *)addr1;
+                b = (struct sockaddr_in *)addr2;
+
+                if (a->sin_addr.s_addr == b->sin_addr.s_addr &&
+                    a->sin_port == b->sin_port)
+                        return true;
+                break;
+
+        case AF_INET6:
+                a6 = (struct sockaddr_in6 *)addr1;
+                b6 = (struct sockaddr_in6 *)addr2;
+
+                /* LINKLOCAL addresses must have matching scope_id */
+                if (ipv6_addr_src_scope(&a6->sin6_addr) ==
+                    IPV6_ADDR_SCOPE_LINKLOCAL &&
+                    a6->sin6_scope_id != b6->sin6_scope_id)
+                        return false;
+
+                if (ipv6_addr_equal(&a6->sin6_addr, &b6->sin6_addr) &&
+                    a6->sin6_port == b6->sin6_port)
+                        return true;
+                break;
+
+        default:
+                dprintk("%s: unhandled address family: %u\n",
+                        __func__, addr1->sa_family);
+                return false;
+        }
+
+        return false;
+}
+
+static bool
+_same_data_server_addrs_locked(const struct list_head *dsaddrs1,
+                               const struct list_head *dsaddrs2)
+{
+        struct nfs4_pnfs_ds_addr *da1, *da2;
+
+        /* step through both lists, comparing as we go */
+        for (da1 = list_first_entry(dsaddrs1, typeof(*da1), da_node),
+             da2 = list_first_entry(dsaddrs2, typeof(*da2), da_node);
+             da1 != NULL && da2 != NULL;
+             da1 = list_entry(da1->da_node.next, typeof(*da1), da_node),
+             da2 = list_entry(da2->da_node.next, typeof(*da2), da_node)) {
+                if (!same_sockaddr((struct sockaddr *)&da1->da_addr,
+                                   (struct sockaddr *)&da2->da_addr))
+                        return false;
+        }
+        if (da1 == NULL && da2 == NULL)
+                return true;
+
+        return false;
+}
+
+/*
+ * Lookup DS by addresses.  nfs4_ds_cache_lock is held
+ */
+static struct nfs4_pnfs_ds *
+_data_server_lookup_locked(const struct list_head *dsaddrs)
+{
+        struct nfs4_pnfs_ds *ds;
+
+        list_for_each_entry(ds, &nfs4_data_server_cache, ds_node)
+                if (_same_data_server_addrs_locked(&ds->ds_addrs, dsaddrs))
+                        return ds;
+        return NULL;
+}
+
+/*
+ * Create an rpc connection to the nfs4_pnfs_ds data server
+ * Currently only supports IPv4 and IPv6 addresses
+ */
+static int
+nfs4_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds)
+{
+        struct nfs_client *clp = ERR_PTR(-EIO);
+        struct nfs4_pnfs_ds_addr *da;
+        int status = 0;
+
+        dprintk("--> %s DS %s au_flavor %d\n", __func__, ds->ds_remotestr,
+                mds_srv->nfs_client->cl_rpcclient->cl_auth->au_flavor);
+
+        list_for_each_entry(da, &ds->ds_addrs, da_node) {
+                dprintk("%s: DS %s: trying address %s\n",
+                        __func__, ds->ds_remotestr, da->da_remotestr);
+
+                clp = nfs4_set_ds_client(mds_srv->nfs_client,
+                                        (struct sockaddr *)&da->da_addr,
+                                        da->da_addrlen, IPPROTO_TCP,
+                                        dataserver_timeo, dataserver_retrans);
+                if (!IS_ERR(clp))
+                        break;
+        }
+
+        if (IS_ERR(clp)) {
+                status = PTR_ERR(clp);
+                goto out;
+        }
+
+        status = nfs4_init_ds_session(clp, mds_srv->nfs_client->cl_lease_time);
+        if (status)
+                goto out_put;
+
+        smp_wmb();
+        ds->ds_clp = clp;
+        dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr);
+out:
+        return status;
+out_put:
+        nfs_put_client(clp);
+        goto out;
+}
+
+static void
+destroy_ds(struct nfs4_pnfs_ds *ds)
+{
+        struct nfs4_pnfs_ds_addr *da;
+
+        dprintk("--> %s\n", __func__);
+        ifdebug(FACILITY)
+                print_ds(ds);
+
+        if (ds->ds_clp)
+                nfs_put_client(ds->ds_clp);
+
+        while (!list_empty(&ds->ds_addrs)) {
+                da = list_first_entry(&ds->ds_addrs,
+                                      struct nfs4_pnfs_ds_addr,
+                                      da_node);
+                list_del_init(&da->da_node);
+                kfree(da->da_remotestr);
+                kfree(da);
+        }
+
+        kfree(ds->ds_remotestr);
+        kfree(ds);
+}
+
+void
+nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr)
+{
+        struct nfs4_pnfs_ds *ds;
+        int i;
+
+        nfs4_print_deviceid(&dsaddr->id_node.deviceid);
+
+        for (i = 0; i < dsaddr->ds_num; i++) {
+                ds = dsaddr->ds_list[i];
+                if (ds != NULL) {
+                        if (atomic_dec_and_lock(&ds->ds_count,
+                                                &nfs4_ds_cache_lock)) {
+                                list_del_init(&ds->ds_node);
+                                spin_unlock(&nfs4_ds_cache_lock);
+                                destroy_ds(ds);
+                        }
+                }
+        }
+        kfree(dsaddr->stripe_indices);
+        kfree(dsaddr);
+}
+
+/*
+ * Create a string with a human readable address and port to avoid
+ * complicated setup around many dprinks.
+ */
+static char *
+nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags)
+{
+        struct nfs4_pnfs_ds_addr *da;
+        char *remotestr;
+        size_t len;
+        char *p;
+
+        len = 3;        /* '{', '}' and eol */
+        list_for_each_entry(da, dsaddrs, da_node) {
+                len += strlen(da->da_remotestr) + 1;    /* string plus comma */
+        }
+
+        remotestr = kzalloc(len, gfp_flags);
+        if (!remotestr)
+                return NULL;
+
+        p = remotestr;
+        *(p++) = '{';
+        len--;
+        list_for_each_entry(da, dsaddrs, da_node) {
+                size_t ll = strlen(da->da_remotestr);
+
+                if (ll > len)
+                        goto out_err;
+
+                memcpy(p, da->da_remotestr, ll);
+                p += ll;
+                len -= ll;
+
+                if (len < 1)
+                        goto out_err;
+                (*p++) = ',';
+                len--;
+        }
+        if (len < 2)
+                goto out_err;
+        *(p++) = '}';
+        *p = '\0';
+        return remotestr;
+out_err:
+        kfree(remotestr);
+        return NULL;
+}
+
+static struct nfs4_pnfs_ds *
+nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags)
+{
+        struct nfs4_pnfs_ds *tmp_ds, *ds = NULL;
+        char *remotestr;
+
+        if (list_empty(dsaddrs)) {
+                dprintk("%s: no addresses defined\n", __func__);
+                goto out;
+        }
+
+        ds = kzalloc(sizeof(*ds), gfp_flags);
+        if (!ds)
+                goto out;
+
+        /* this is only used for debugging, so it's ok if its NULL */
+        remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags);
+
+        spin_lock(&nfs4_ds_cache_lock);
+        tmp_ds = _data_server_lookup_locked(dsaddrs);
+        if (tmp_ds == NULL) {
+                INIT_LIST_HEAD(&ds->ds_addrs);
+                list_splice_init(dsaddrs, &ds->ds_addrs);
+                ds->ds_remotestr = remotestr;
+                atomic_set(&ds->ds_count, 1);
+                INIT_LIST_HEAD(&ds->ds_node);
+                ds->ds_clp = NULL;
+                list_add(&ds->ds_node, &nfs4_data_server_cache);
+                dprintk("%s add new data server %s\n", __func__,
+                        ds->ds_remotestr);
+        } else {
+                kfree(remotestr);
+                kfree(ds);
+                atomic_inc(&tmp_ds->ds_count);
+                dprintk("%s data server %s found, inc'ed ds_count to %d\n",
+                        __func__, tmp_ds->ds_remotestr,
+                        atomic_read(&tmp_ds->ds_count));
+                ds = tmp_ds;
+        }
+        spin_unlock(&nfs4_ds_cache_lock);
+out:
+        return ds;
+}
+
+/*
+ * Currently only supports ipv4, ipv6 and one multi-path address.
+ */
+static struct nfs4_pnfs_ds_addr *
+decode_ds_addr(struct net *net, struct xdr_stream *streamp, gfp_t gfp_flags)
+{
+        struct nfs4_pnfs_ds_addr *da = NULL;
+        char *buf, *portstr;
+        __be16 port;
+        int nlen, rlen;
+        int tmp[2];
+        __be32 *p;
+        char *netid, *match_netid;
+        size_t len, match_netid_len;
+        char *startsep = "";
+        char *endsep = "";
+
+
+        /* r_netid */
+        p = xdr_inline_decode(streamp, 4);
+        if (unlikely(!p))
+                goto out_err;
+        nlen = be32_to_cpup(p++);
+
+        p = xdr_inline_decode(streamp, nlen);
+        if (unlikely(!p))
+                goto out_err;
+
+        netid = kmalloc(nlen+1, gfp_flags);
+        if (unlikely(!netid))
+                goto out_err;
+
+        netid[nlen] = '\0';
+        memcpy(netid, p, nlen);
+
+        /* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */
+        p = xdr_inline_decode(streamp, 4);
+        if (unlikely(!p))
+                goto out_free_netid;
+        rlen = be32_to_cpup(p);
+
+        p = xdr_inline_decode(streamp, rlen);
+        if (unlikely(!p))
+                goto out_free_netid;
+
+        /* port is ".ABC.DEF", 8 chars max */
+        if (rlen > INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN + 8) {
+                dprintk("%s: Invalid address, length %d\n", __func__,
+                        rlen);
+                goto out_free_netid;
+        }
+        buf = kmalloc(rlen + 1, gfp_flags);
+        if (!buf) {
+                dprintk("%s: Not enough memory\n", __func__);
+                goto out_free_netid;
+        }
+        buf[rlen] = '\0';
+        memcpy(buf, p, rlen);
+
+        /* replace port '.' with '-' */
+        portstr = strrchr(buf, '.');
+        if (!portstr) {
+                dprintk("%s: Failed finding expected dot in port\n",
+                        __func__);
+                goto out_free_buf;
+        }
+        *portstr = '-';
+
+        /* find '.' between address and port */
+        portstr = strrchr(buf, '.');
+        if (!portstr) {
+                dprintk("%s: Failed finding expected dot between address and "
+                        "port\n", __func__);
+                goto out_free_buf;
+        }
+        *portstr = '\0';
+
+        da = kzalloc(sizeof(*da), gfp_flags);
+        if (unlikely(!da))
+                goto out_free_buf;
+
+        INIT_LIST_HEAD(&da->da_node);
+
+        if (!rpc_pton(net, buf, portstr-buf, (struct sockaddr *)&da->da_addr,
+                      sizeof(da->da_addr))) {
+                dprintk("%s: error parsing address %s\n", __func__, buf);
+                goto out_free_da;
+        }
+
+        portstr++;
+        sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]);
+        port = htons((tmp[0] << 8) | (tmp[1]));
+
+        switch (da->da_addr.ss_family) {
+        case AF_INET:
+                ((struct sockaddr_in *)&da->da_addr)->sin_port = port;
+                da->da_addrlen = sizeof(struct sockaddr_in);
+                match_netid = "tcp";
+                match_netid_len = 3;
+                break;
+
+        case AF_INET6:
+                ((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port;
+                da->da_addrlen = sizeof(struct sockaddr_in6);
+                match_netid = "tcp6";
+                match_netid_len = 4;
+                startsep = "[";
+                endsep = "]";
+                break;
+
+        default:
+                dprintk("%s: unsupported address family: %u\n",
+                        __func__, da->da_addr.ss_family);
+                goto out_free_da;
+        }
+
+        if (nlen != match_netid_len || strncmp(netid, match_netid, nlen)) {
+                dprintk("%s: ERROR: r_netid \"%s\" != \"%s\"\n",
+                        __func__, netid, match_netid);
+                goto out_free_da;
+        }
+
+        /* save human readable address */
+        len = strlen(startsep) + strlen(buf) + strlen(endsep) + 7;
+        da->da_remotestr = kzalloc(len, gfp_flags);
+
+        /* NULL is ok, only used for dprintk */
+        if (da->da_remotestr)
+                snprintf(da->da_remotestr, len, "%s%s%s:%u", startsep,
+                         buf, endsep, ntohs(port));
+
+        dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr);
+        kfree(buf);
+        kfree(netid);
+        return da;
+
+out_free_da:
+        kfree(da);
+out_free_buf:
+        dprintk("%s: Error parsing DS addr: %s\n", __func__, buf);
+        kfree(buf);
+out_free_netid:
+        kfree(netid);
+out_err:
+        return NULL;
+}
+
+/* Decode opaque device data and return the result */
+static struct nfs4_file_layout_dsaddr*
+decode_device(struct inode *ino, struct pnfs_device *pdev, gfp_t gfp_flags)
+{
+        int i;
+        u32 cnt, num;
+        u8 *indexp;
+        __be32 *p;
+        u8 *stripe_indices;
+        u8 max_stripe_index;
+        struct nfs4_file_layout_dsaddr *dsaddr = NULL;
+        struct xdr_stream stream;
+        struct xdr_buf buf;
+        struct page *scratch;
+        struct list_head dsaddrs;
+        struct nfs4_pnfs_ds_addr *da;
+
+        /* set up xdr stream */
+        scratch = alloc_page(gfp_flags);
+        if (!scratch)
+                goto out_err;
+
+        xdr_init_decode_pages(&stream, &buf, pdev->pages, pdev->pglen);
+        xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
+
+        /* Get the stripe count (number of stripe index) */
+        p = xdr_inline_decode(&stream, 4);
+        if (unlikely(!p))
+                goto out_err_free_scratch;
+
+        cnt = be32_to_cpup(p);
+        dprintk("%s stripe count  %d\n", __func__, cnt);
+        if (cnt > NFS4_PNFS_MAX_STRIPE_CNT) {
+                printk(KERN_WARNING "NFS: %s: stripe count %d greater than "
+                       "supported maximum %d\n", __func__,
+                        cnt, NFS4_PNFS_MAX_STRIPE_CNT);
+                goto out_err_free_scratch;
+        }
+
+        /* read stripe indices */
+        stripe_indices = kcalloc(cnt, sizeof(u8), gfp_flags);
+        if (!stripe_indices)
+                goto out_err_free_scratch;
+
+        p = xdr_inline_decode(&stream, cnt << 2);
+        if (unlikely(!p))
+                goto out_err_free_stripe_indices;
+
+        indexp = &stripe_indices[0];
+        max_stripe_index = 0;
+        for (i = 0; i < cnt; i++) {
+                *indexp = be32_to_cpup(p++);
+                max_stripe_index = max(max_stripe_index, *indexp);
+                indexp++;
+        }
+
+        /* Check the multipath list count */
+        p = xdr_inline_decode(&stream, 4);
+        if (unlikely(!p))
+                goto out_err_free_stripe_indices;
+
+        num = be32_to_cpup(p);
+        dprintk("%s ds_num %u\n", __func__, num);
+        if (num > NFS4_PNFS_MAX_MULTI_CNT) {
+                printk(KERN_WARNING "NFS: %s: multipath count %d greater than "
+                        "supported maximum %d\n", __func__,
+                        num, NFS4_PNFS_MAX_MULTI_CNT);
+                goto out_err_free_stripe_indices;
+        }
+
+        /* validate stripe indices are all < num */
+        if (max_stripe_index >= num) {
+                printk(KERN_WARNING "NFS: %s: stripe index %u >= num ds %u\n",
+                        __func__, max_stripe_index, num);
+                goto out_err_free_stripe_indices;
+        }
+
+        dsaddr = kzalloc(sizeof(*dsaddr) +
+                        (sizeof(struct nfs4_pnfs_ds *) * (num - 1)),
+                        gfp_flags);
+        if (!dsaddr)
+                goto out_err_free_stripe_indices;
+
+        dsaddr->stripe_count = cnt;
+        dsaddr->stripe_indices = stripe_indices;
+        stripe_indices = NULL;
+        dsaddr->ds_num = num;
+        nfs4_init_deviceid_node(&dsaddr->id_node,
+                                NFS_SERVER(ino)->pnfs_curr_ld,
+                                NFS_SERVER(ino)->nfs_client,
+                                &pdev->dev_id);
+
+        INIT_LIST_HEAD(&dsaddrs);
+
+        for (i = 0; i < dsaddr->ds_num; i++) {
+                int j;
+                u32 mp_count;
+
+                p = xdr_inline_decode(&stream, 4);
+                if (unlikely(!p))
+                        goto out_err_free_deviceid;
+
+                mp_count = be32_to_cpup(p); /* multipath count */
+                for (j = 0; j < mp_count; j++) {
+                        da = decode_ds_addr(NFS_SERVER(ino)->nfs_client->cl_net,
+                                            &stream, gfp_flags);
+                        if (da)
+                                list_add_tail(&da->da_node, &dsaddrs);
+                }
+                if (list_empty(&dsaddrs)) {
+                        dprintk("%s: no suitable DS addresses found\n",
+                                __func__);
+                        goto out_err_free_deviceid;
+                }
+
+                dsaddr->ds_list[i] = nfs4_pnfs_ds_add(&dsaddrs, gfp_flags);
+                if (!dsaddr->ds_list[i])
+                        goto out_err_drain_dsaddrs;
+
+                /* If DS was already in cache, free ds addrs */
+                while (!list_empty(&dsaddrs)) {
+                        da = list_first_entry(&dsaddrs,
+                                              struct nfs4_pnfs_ds_addr,
+                                              da_node);
+                        list_del_init(&da->da_node);
+                        kfree(da->da_remotestr);
+                        kfree(da);
+                }
+        }
+
+        __free_page(scratch);
+        return dsaddr;
+
+out_err_drain_dsaddrs:
+        while (!list_empty(&dsaddrs)) {
+                da = list_first_entry(&dsaddrs, struct nfs4_pnfs_ds_addr,
+                                      da_node);
+                list_del_init(&da->da_node);
+                kfree(da->da_remotestr);
+                kfree(da);
+        }
+out_err_free_deviceid:
+        nfs4_fl_free_deviceid(dsaddr);
+        /* stripe_indicies was part of dsaddr */
+        goto out_err_free_scratch;
+out_err_free_stripe_indices:
+        kfree(stripe_indices);
+out_err_free_scratch:
+        __free_page(scratch);
+out_err:
+        dprintk("%s ERROR: returning NULL\n", __func__);
+        return NULL;
+}
+
+/*
+ * Decode the opaque device specified in 'dev' and add it to the cache of
+ * available devices.
+ */
+static struct nfs4_file_layout_dsaddr *
+decode_and_add_device(struct inode *inode, struct pnfs_device *dev, gfp_t gfp_flags)
+{
+        struct nfs4_deviceid_node *d;
+        struct nfs4_file_layout_dsaddr *n, *new;
+
+        new = decode_device(inode, dev, gfp_flags);
+        if (!new) {
+                printk(KERN_WARNING "NFS: %s: Could not decode or add device\n",
+                        __func__);
+                return NULL;
+        }
+
+        d = nfs4_insert_deviceid_node(&new->id_node);
+        n = container_of(d, struct nfs4_file_layout_dsaddr, id_node);
+        if (n != new) {
+                nfs4_fl_free_deviceid(new);
+                return n;
+        }
+
+        return new;
+}
+
+/*
+ * Retrieve the information for dev_id, add it to the list
+ * of available devices, and return it.
+ */
+struct nfs4_file_layout_dsaddr *
+filelayout_get_device_info(struct inode *inode,
+                struct nfs4_deviceid *dev_id,
+                struct rpc_cred *cred,
+                gfp_t gfp_flags)
+{
+        struct pnfs_device *pdev = NULL;
+        u32 max_resp_sz;
+        int max_pages;
+        struct page **pages = NULL;
+        struct nfs4_file_layout_dsaddr *dsaddr = NULL;
+        int rc, i;
+        struct nfs_server *server = NFS_SERVER(inode);
+
+        /*
+         * Use the session max response size as the basis for setting
+         * GETDEVICEINFO's maxcount
+         */
+        max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
+        max_pages = nfs_page_array_len(0, max_resp_sz);
+        dprintk("%s inode %p max_resp_sz %u max_pages %d\n",
+                __func__, inode, max_resp_sz, max_pages);
+
+        pdev = kzalloc(sizeof(struct pnfs_device), gfp_flags);
+        if (pdev == NULL)
+                return NULL;
+
+        pages = kzalloc(max_pages * sizeof(struct page *), gfp_flags);
+        if (pages == NULL) {
+                kfree(pdev);
+                return NULL;
+        }
+        for (i = 0; i < max_pages; i++) {
+                pages[i] = alloc_page(gfp_flags);
+                if (!pages[i])
+                        goto out_free;
+        }
+
+        memcpy(&pdev->dev_id, dev_id, sizeof(*dev_id));
+        pdev->layout_type = LAYOUT_NFSV4_1_FILES;
+        pdev->pages = pages;
+        pdev->pgbase = 0;
+        pdev->pglen = max_resp_sz;
+        pdev->mincount = 0;
+        pdev->maxcount = max_resp_sz - nfs41_maxgetdevinfo_overhead;
+
+        rc = nfs4_proc_getdeviceinfo(server, pdev, cred);
+        dprintk("%s getdevice info returns %d\n", __func__, rc);
+        if (rc)
+                goto out_free;
+
+        /*
+         * Found new device, need to decode it and then add it to the
+         * list of known devices for this mountpoint.
+         */
+        dsaddr = decode_and_add_device(inode, pdev, gfp_flags);
+out_free:
+        for (i = 0; i < max_pages; i++)
+                __free_page(pages[i]);
+        kfree(pages);
+        kfree(pdev);
+        dprintk("<-- %s dsaddr %p\n", __func__, dsaddr);
+        return dsaddr;
+}
+
+void
+nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr)
+{
+        nfs4_put_deviceid_node(&dsaddr->id_node);
+}
+
+/*
+ * Want res = (offset - layout->pattern_offset)/ layout->stripe_unit
+ * Then: ((res + fsi) % dsaddr->stripe_count)
+ */
+u32
+nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset)
+{
+        struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
+        u64 tmp;
+
+        tmp = offset - flseg->pattern_offset;
+        do_div(tmp, flseg->stripe_unit);
+        tmp += flseg->first_stripe_index;
+        return do_div(tmp, flseg->dsaddr->stripe_count);
+}
+
+u32
+nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j)
+{
+        return FILELAYOUT_LSEG(lseg)->dsaddr->stripe_indices[j];
+}
+
+struct nfs_fh *
+nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j)
+{
+        struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
+        u32 i;
+
+        if (flseg->stripe_type == STRIPE_SPARSE) {
+                if (flseg->num_fh == 1)
+                        i = 0;
+                else if (flseg->num_fh == 0)
+                        /* Use the MDS OPEN fh set in nfs_read_rpcsetup */
+                        return NULL;
+                else
+                        i = nfs4_fl_calc_ds_index(lseg, j);
+        } else
+                i = j;
+        return flseg->fh_array[i];
+}
+
+static void nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds)
+{
+        might_sleep();
+        wait_on_bit(&ds->ds_state, NFS4DS_CONNECTING,
+                        nfs_wait_bit_killable, TASK_KILLABLE);
+}
+
+static void nfs4_clear_ds_conn_bit(struct nfs4_pnfs_ds *ds)
+{
+        smp_mb__before_atomic();
+        clear_bit(NFS4DS_CONNECTING, &ds->ds_state);
+        smp_mb__after_atomic();
+        wake_up_bit(&ds->ds_state, NFS4DS_CONNECTING);
+}
+
+
+struct nfs4_pnfs_ds *
+nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx)
+{
+        struct nfs4_file_layout_dsaddr *dsaddr = FILELAYOUT_LSEG(lseg)->dsaddr;
+        struct nfs4_pnfs_ds *ds = dsaddr->ds_list[ds_idx];
+        struct nfs4_deviceid_node *devid = FILELAYOUT_DEVID_NODE(lseg);
+        struct nfs4_pnfs_ds *ret = ds;
+
+        if (ds == NULL) {
+                printk(KERN_ERR "NFS: %s: No data server for offset index %d\n",
+                        __func__, ds_idx);
+                filelayout_mark_devid_invalid(devid);
+                goto out;
+        }
+        smp_rmb();
+        if (ds->ds_clp)
+                goto out_test_devid;
+
+        if (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) == 0) {
+                struct nfs_server *s = NFS_SERVER(lseg->pls_layout->plh_inode);
+                int err;
+
+                err = nfs4_ds_connect(s, ds);
+                if (err)
+                        nfs4_mark_deviceid_unavailable(devid);
+                nfs4_clear_ds_conn_bit(ds);
+        } else {
+                /* Either ds is connected, or ds is NULL */
+                nfs4_wait_ds_connect(ds);
+        }
+out_test_devid:
+        if (filelayout_test_devid_unavailable(devid))
+                ret = NULL;
+out:
+        return ret;
+}
+
+module_param(dataserver_retrans, uint, 0644);
+MODULE_PARM_DESC(dataserver_retrans, "The  number of times the NFSv4.1 client "
+                        "retries a request before it attempts further "
+                        " recovery  action.");
+module_param(dataserver_timeo, uint, 0644);
+MODULE_PARM_DESC(dataserver_timeo, "The time (in tenths of a second) the "
+                        "NFSv4.1  client  waits for a response from a "
+                        " data server before it retries an NFS request.");