/* AFS File Server client stubs
 *
 * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/circ_buf.h>
#include <linux/iversion.h>
#include "internal.h"
#include "afs_fs.h"
#include "xdr_fs.h"

static const struct afs_fid afs_zero_fid;

/*
 * We need somewhere to discard into in case the server helpfully returns more
 * than we asked for in FS.FetchData{,64}.
 */
static u8 afs_discard_buffer[64];

static inline void afs_use_fs_server(struct afs_call *call, struct afs_cb_interest *cbi)
{
        call->cbi = afs_get_cb_interest(cbi);
}

/*
 * decode an AFSFid block
 */
static void xdr_decode_AFSFid(const __be32 **_bp, struct afs_fid *fid)
{
        const __be32 *bp = *_bp;

        fid->vid                = ntohl(*bp++);
        fid->vnode              = ntohl(*bp++);
        fid->unique             = ntohl(*bp++);
        *_bp = bp;
}

/*
 * Dump a bad file status record.
 */
static void xdr_dump_bad(const __be32 *bp)
{
        __be32 x[4];
        int i;

        pr_notice("AFS XDR: Bad status record\n");
        for (i = 0; i < 5 * 4 * 4; i += 16) {
                memcpy(x, bp, 16);
                bp += 4;
                pr_notice("%03x: %08x %08x %08x %08x\n",
                          i, ntohl(x[0]), ntohl(x[1]), ntohl(x[2]), ntohl(x[3]));
        }

        memcpy(x, bp, 4);
        pr_notice("0x50: %08x\n", ntohl(x[0]));
}

/*
 * Update the core inode struct from a returned status record.
 */
void afs_update_inode_from_status(struct afs_vnode *vnode,
                                  struct afs_file_status *status,
                                  const afs_dataversion_t *expected_version,
                                  u8 flags)
{
        struct timespec64 t;
        umode_t mode;

        t.tv_sec = status->mtime_client;
        t.tv_nsec = 0;
        vnode->vfs_inode.i_ctime = t;
        vnode->vfs_inode.i_mtime = t;
        vnode->vfs_inode.i_atime = t;

        if (flags & (AFS_VNODE_META_CHANGED | AFS_VNODE_NOT_YET_SET)) {
                vnode->vfs_inode.i_uid = make_kuid(&init_user_ns, status->owner);
                vnode->vfs_inode.i_gid = make_kgid(&init_user_ns, status->group);
                set_nlink(&vnode->vfs_inode, status->nlink);

                mode = vnode->vfs_inode.i_mode;
                mode &= ~S_IALLUGO;
                mode |= status->mode;
                barrier();
                vnode->vfs_inode.i_mode = mode;
        }

        if (!(flags & AFS_VNODE_NOT_YET_SET)) {
                if (expected_version &&
                    *expected_version != status->data_version) {
                        _debug("vnode modified %llx on {%x:%u} [exp %llx]",
                               (unsigned long long) status->data_version,
                               vnode->fid.vid, vnode->fid.vnode,
                               (unsigned long long) *expected_version);
                        vnode->invalid_before = status->data_version;
                        if (vnode->status.type == AFS_FTYPE_DIR) {
                                if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
                                        afs_stat_v(vnode, n_inval);
                        } else {
                                set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags);
                        }
                } else if (vnode->status.type == AFS_FTYPE_DIR) {
                        /* Expected directory change is handled elsewhere so
                         * that we can locally edit the directory and save on a
                         * download.
                         */
                        if (test_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
                                flags &= ~AFS_VNODE_DATA_CHANGED;
                }
        }

        if (flags & (AFS_VNODE_DATA_CHANGED | AFS_VNODE_NOT_YET_SET)) {
                inode_set_iversion_raw(&vnode->vfs_inode, status->data_version);
                i_size_write(&vnode->vfs_inode, status->size);
        }
}

/*
 * decode an AFSFetchStatus block
 */
static int xdr_decode_AFSFetchStatus(struct afs_call *call,
                                     const __be32 **_bp,
                                     struct afs_file_status *status,
                                     struct afs_vnode *vnode,
                                     const afs_dataversion_t *expected_version,
                                     struct afs_read *read_req)
{
        const struct afs_xdr_AFSFetchStatus *xdr = (const void *)*_bp;
        bool inline_error = (call->operation_ID == afs_FS_InlineBulkStatus);
        u64 data_version, size;
        u32 type, abort_code;
        u8 flags = 0;

        abort_code = ntohl(xdr->abort_code);

        if (xdr->if_version != htonl(AFS_FSTATUS_VERSION)) {
                if (xdr->if_version == htonl(0) &&
                    abort_code != 0 &&
                    inline_error) {
                        /* The OpenAFS fileserver has a bug in FS.InlineBulkStatus
                         * whereby it doesn't set the interface version in the error
                         * case.
                         */
                        status->abort_code = abort_code;
                        return 0;
                }

                pr_warn("Unknown AFSFetchStatus version %u\n", ntohl(xdr->if_version));
                goto bad;
        }

        if (abort_code != 0 && inline_error) {
                status->abort_code = abort_code;
                return 0;
        }

        type = ntohl(xdr->type);
        switch (type) {
        case AFS_FTYPE_FILE:
        case AFS_FTYPE_DIR:
        case AFS_FTYPE_SYMLINK:
                if (type != status->type &&
                    vnode &&
                    !test_bit(AFS_VNODE_UNSET, &vnode->flags)) {
                        pr_warning("Vnode %x:%x:%x changed type %u to %u\n",
                                   vnode->fid.vid,
                                   vnode->fid.vnode,
                                   vnode->fid.unique,
                                   status->type, type);
                        goto bad;
                }
                status->type = type;
                break;
        default:
                goto bad;
        }

#define EXTRACT_M(FIELD)                                        \
        do {                                                    \
                u32 x = ntohl(xdr->FIELD);                      \
                if (status->FIELD != x) {                       \
                        flags |= AFS_VNODE_META_CHANGED;        \
                        status->FIELD = x;                      \
                }                                               \
        } while (0)

        EXTRACT_M(nlink);
        EXTRACT_M(author);
        EXTRACT_M(owner);
        EXTRACT_M(caller_access); /* call ticket dependent */
        EXTRACT_M(anon_access);
        EXTRACT_M(mode);
        EXTRACT_M(group);

        status->mtime_client = ntohl(xdr->mtime_client);
        status->mtime_server = ntohl(xdr->mtime_server);
        status->lock_count   = ntohl(xdr->lock_count);

        size  = (u64)ntohl(xdr->size_lo);
        size |= (u64)ntohl(xdr->size_hi) << 32;
        status->size = size;

        data_version  = (u64)ntohl(xdr->data_version_lo);
        data_version |= (u64)ntohl(xdr->data_version_hi) << 32;
        if (data_version != status->data_version) {
                status->data_version = data_version;
                flags |= AFS_VNODE_DATA_CHANGED;
        }

        if (read_req) {
                read_req->data_version = data_version;
                read_req->file_size = size;
        }

        *_bp = (const void *)*_bp + sizeof(*xdr);

        if (vnode) {
                if (test_bit(AFS_VNODE_UNSET, &vnode->flags))
                        flags |= AFS_VNODE_NOT_YET_SET;
                afs_update_inode_from_status(vnode, status, expected_version,
                                             flags);
        }

        return 0;

bad:
        xdr_dump_bad(*_bp);
        return afs_protocol_error(call, -EBADMSG);
}

/*
 * Decode the file status.  We need to lock the target vnode if we're going to
 * update its status so that stat() sees the attributes update atomically.
 */
static int afs_decode_status(struct afs_call *call,
                             const __be32 **_bp,
                             struct afs_file_status *status,
                             struct afs_vnode *vnode,
                             const afs_dataversion_t *expected_version,
                             struct afs_read *read_req)
{
        int ret;

        if (!vnode)
                return xdr_decode_AFSFetchStatus(call, _bp, status, vnode,
                                                 expected_version, read_req);

        write_seqlock(&vnode->cb_lock);
        ret = xdr_decode_AFSFetchStatus(call, _bp, status, vnode,
                                        expected_version, read_req);
        write_sequnlock(&vnode->cb_lock);
        return ret;
}

/*
 * decode an AFSCallBack block
 */
static void xdr_decode_AFSCallBack(struct afs_call *call,
                                   struct afs_vnode *vnode,
                                   const __be32 **_bp)
{
        struct afs_cb_interest *old, *cbi = call->cbi;
        const __be32 *bp = *_bp;
        u32 cb_expiry;

        write_seqlock(&vnode->cb_lock);

        if (call->cb_break == afs_cb_break_sum(vnode, cbi)) {
                vnode->cb_version       = ntohl(*bp++);
                cb_expiry               = ntohl(*bp++);
                vnode->cb_type          = ntohl(*bp++);
                vnode->cb_expires_at    = cb_expiry + ktime_get_real_seconds();
                old = vnode->cb_interest;
                if (old != call->cbi) {
                        vnode->cb_interest = cbi;
                        cbi = old;
                }
                set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
        } else {
                bp += 3;
        }

        write_sequnlock(&vnode->cb_lock);
        call->cbi = cbi;
        *_bp = bp;
}

static void xdr_decode_AFSCallBack_raw(const __be32 **_bp,
                                       struct afs_callback *cb)
{
        const __be32 *bp = *_bp;

        cb->version     = ntohl(*bp++);
        cb->expiry      = ntohl(*bp++);
        cb->type        = ntohl(*bp++);
        *_bp = bp;
}

/*
 * decode an AFSVolSync block
 */
static void xdr_decode_AFSVolSync(const __be32 **_bp,
                                  struct afs_volsync *volsync)
{
        const __be32 *bp = *_bp;

        volsync->creation = ntohl(*bp++);
        bp++; /* spare2 */
        bp++; /* spare3 */
        bp++; /* spare4 */
        bp++; /* spare5 */
        bp++; /* spare6 */
        *_bp = bp;
}

/*
 * encode the requested attributes into an AFSStoreStatus block
 */
static void xdr_encode_AFS_StoreStatus(__be32 **_bp, struct iattr *attr)
{
        __be32 *bp = *_bp;
        u32 mask = 0, mtime = 0, owner = 0, group = 0, mode = 0;

        mask = 0;
        if (attr->ia_valid & ATTR_MTIME) {
                mask |= AFS_SET_MTIME;
                mtime = attr->ia_mtime.tv_sec;
        }

        if (attr->ia_valid & ATTR_UID) {
                mask |= AFS_SET_OWNER;
                owner = from_kuid(&init_user_ns, attr->ia_uid);
        }

        if (attr->ia_valid & ATTR_GID) {
                mask |= AFS_SET_GROUP;
                group = from_kgid(&init_user_ns, attr->ia_gid);
        }

        if (attr->ia_valid & ATTR_MODE) {
                mask |= AFS_SET_MODE;
                mode = attr->ia_mode & S_IALLUGO;
        }

        *bp++ = htonl(mask);
        *bp++ = htonl(mtime);
        *bp++ = htonl(owner);
        *bp++ = htonl(group);
        *bp++ = htonl(mode);
        *bp++ = 0;              /* segment size */
        *_bp = bp;
}

/*
 * decode an AFSFetchVolumeStatus block
 */
static void xdr_decode_AFSFetchVolumeStatus(const __be32 **_bp,
                                            struct afs_volume_status *vs)
{
        const __be32 *bp = *_bp;

        vs->vid                 = ntohl(*bp++);
        vs->parent_id           = ntohl(*bp++);
        vs->online              = ntohl(*bp++);
        vs->in_service          = ntohl(*bp++);
        vs->blessed             = ntohl(*bp++);
        vs->needs_salvage       = ntohl(*bp++);
        vs->type                = ntohl(*bp++);
        vs->min_quota           = ntohl(*bp++);
        vs->max_quota           = ntohl(*bp++);
        vs->blocks_in_use       = ntohl(*bp++);
        vs->part_blocks_avail   = ntohl(*bp++);
        vs->part_max_blocks     = ntohl(*bp++);
        *_bp = bp;
}

/*
 * deliver reply data to an FS.FetchStatus
 */
static int afs_deliver_fs_fetch_status_vnode(struct afs_call *call)
{
        struct afs_vnode *vnode = call->reply[0];
        const __be32 *bp;
        int ret;

        ret = afs_transfer_reply(call);
        if (ret < 0)
                return ret;

        _enter("{%x:%u}", vnode->fid.vid, vnode->fid.vnode);

        /* unmarshall the reply once we've received all of it */
        bp = call->buffer;
        if (afs_decode_status(call, &bp, &vnode->status, vnode,
                              &call->expected_version, NULL) < 0)
                return afs_protocol_error(call, -EBADMSG);
        xdr_decode_AFSCallBack(call, vnode, &bp);
        if (call->reply[1])
                xdr_decode_AFSVolSync(&bp, call->reply[1]);

        _leave(" = 0 [done]");
        return 0;
}

/*
 * FS.FetchStatus operation type
 */
static const struct afs_call_type afs_RXFSFetchStatus_vnode = {
        .name           = "FS.FetchStatus(vnode)",
        .op             = afs_FS_FetchStatus,
        .deliver        = afs_deliver_fs_fetch_status_vnode,
        .destructor     = afs_flat_call_destructor,
};

/*
 * fetch the status information for a file
 */
int afs_fs_fetch_file_status(struct afs_fs_cursor *fc, struct afs_volsync *volsync,
                             bool new_inode)
{
        struct afs_vnode *vnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(vnode);
        __be32 *bp;

        _enter(",%x,{%x:%u},,",
               key_serial(fc->key), vnode->fid.vid, vnode->fid.vnode);

        call = afs_alloc_flat_call(net, &afs_RXFSFetchStatus_vnode,
                                   16, (21 + 3 + 6) * 4);
        if (!call) {
                fc->ac.error = -ENOMEM;
                return -ENOMEM;
        }

        call->key = fc->key;
        call->reply[0] = vnode;
        call->reply[1] = volsync;
        call->expected_version = new_inode ? 1 : vnode->status.data_version;

        /* marshall the parameters */
        bp = call->request;
        bp[0] = htonl(FSFETCHSTATUS);
        bp[1] = htonl(vnode->fid.vid);
        bp[2] = htonl(vnode->fid.vnode);
        bp[3] = htonl(vnode->fid.unique);

        call->cb_break = fc->cb_break;
        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call(call, &vnode->fid);
        return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}

/*
 * deliver reply data to an FS.FetchData
 */
static int afs_deliver_fs_fetch_data(struct afs_call *call)
{
        struct afs_vnode *vnode = call->reply[0];
        struct afs_read *req = call->reply[2];
        const __be32 *bp;
        unsigned int size;
        void *buffer;
        int ret;

        _enter("{%u,%zu/%u;%llu/%llu}",
               call->unmarshall, call->offset, call->count,
               req->remain, req->actual_len);

        switch (call->unmarshall) {
        case 0:
                req->actual_len = 0;
                call->offset = 0;
                call->unmarshall++;
                if (call->operation_ID != FSFETCHDATA64) {
                        call->unmarshall++;
                        goto no_msw;
                }

                /* extract the upper part of the returned data length of an
                 * FSFETCHDATA64 op (which should always be 0 using this
                 * client) */
        case 1:
                _debug("extract data length (MSW)");
                ret = afs_extract_data(call, &call->tmp, 4, true);
                if (ret < 0)
                        return ret;

                req->actual_len = ntohl(call->tmp);
                req->actual_len <<= 32;
                call->offset = 0;
                call->unmarshall++;

        no_msw:
                /* extract the returned data length */
        case 2:
                _debug("extract data length");
                ret = afs_extract_data(call, &call->tmp, 4, true);
                if (ret < 0)
                        return ret;

                req->actual_len |= ntohl(call->tmp);
                _debug("DATA length: %llu", req->actual_len);

                req->remain = req->actual_len;
                call->offset = req->pos & (PAGE_SIZE - 1);
                req->index = 0;
                if (req->actual_len == 0)
                        goto no_more_data;
                call->unmarshall++;

        begin_page:
                ASSERTCMP(req->index, <, req->nr_pages);
                if (req->remain > PAGE_SIZE - call->offset)
                        size = PAGE_SIZE - call->offset;
                else
                        size = req->remain;
                call->count = call->offset + size;
                ASSERTCMP(call->count, <=, PAGE_SIZE);
                req->remain -= size;

                /* extract the returned data */
        case 3:
                _debug("extract data %llu/%llu %zu/%u",
                       req->remain, req->actual_len, call->offset, call->count);

                buffer = kmap(req->pages[req->index]);
                ret = afs_extract_data(call, buffer, call->count, true);
                kunmap(req->pages[req->index]);
                if (ret < 0)
                        return ret;
                if (call->offset == PAGE_SIZE) {
                        if (req->page_done)
                                req->page_done(call, req);
                        req->index++;
                        if (req->remain > 0) {
                                call->offset = 0;
                                if (req->index >= req->nr_pages) {
                                        call->unmarshall = 4;
                                        goto begin_discard;
                                }
                                goto begin_page;
                        }
                }
                goto no_more_data;

                /* Discard any excess data the server gave us */
        begin_discard:
        case 4:
                size = min_t(loff_t, sizeof(afs_discard_buffer), req->remain);
                call->count = size;
                _debug("extract discard %llu/%llu %zu/%u",
                       req->remain, req->actual_len, call->offset, call->count);

                call->offset = 0;
                ret = afs_extract_data(call, afs_discard_buffer, call->count, true);
                req->remain -= call->offset;
                if (ret < 0)
                        return ret;
                if (req->remain > 0)
                        goto begin_discard;

        no_more_data:
                call->offset = 0;
                call->unmarshall = 5;

                /* extract the metadata */
        case 5:
                ret = afs_extract_data(call, call->buffer,
                                       (21 + 3 + 6) * 4, false);
                if (ret < 0)
                        return ret;

                bp = call->buffer;
                if (afs_decode_status(call, &bp, &vnode->status, vnode,
                                      &vnode->status.data_version, req) < 0)
                        return afs_protocol_error(call, -EBADMSG);
                xdr_decode_AFSCallBack(call, vnode, &bp);
                if (call->reply[1])
                        xdr_decode_AFSVolSync(&bp, call->reply[1]);

                call->offset = 0;
                call->unmarshall++;

        case 6:
                break;
        }

        for (; req->index < req->nr_pages; req->index++) {
                if (call->count < PAGE_SIZE)
                        zero_user_segment(req->pages[req->index],
                                          call->count, PAGE_SIZE);
                if (req->page_done)
                        req->page_done(call, req);
                call->count = 0;
        }

        _leave(" = 0 [done]");
        return 0;
}

static void afs_fetch_data_destructor(struct afs_call *call)
{
        struct afs_read *req = call->reply[2];

        afs_put_read(req);
        afs_flat_call_destructor(call);
}

/*
 * FS.FetchData operation type
 */
static const struct afs_call_type afs_RXFSFetchData = {
        .name           = "FS.FetchData",
        .op             = afs_FS_FetchData,
        .deliver        = afs_deliver_fs_fetch_data,
        .destructor     = afs_fetch_data_destructor,
};

static const struct afs_call_type afs_RXFSFetchData64 = {
        .name           = "FS.FetchData64",
        .op             = afs_FS_FetchData64,
        .deliver        = afs_deliver_fs_fetch_data,
        .destructor     = afs_fetch_data_destructor,
};

/*
 * fetch data from a very large file
 */
static int afs_fs_fetch_data64(struct afs_fs_cursor *fc, struct afs_read *req)
{
        struct afs_vnode *vnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(vnode);
        __be32 *bp;

        _enter("");

        call = afs_alloc_flat_call(net, &afs_RXFSFetchData64, 32, (21 + 3 + 6) * 4);
        if (!call)
                return -ENOMEM;

        call->key = fc->key;
        call->reply[0] = vnode;
        call->reply[1] = NULL; /* volsync */
        call->reply[2] = req;
        call->expected_version = vnode->status.data_version;

        /* marshall the parameters */
        bp = call->request;
        bp[0] = htonl(FSFETCHDATA64);
        bp[1] = htonl(vnode->fid.vid);
        bp[2] = htonl(vnode->fid.vnode);
        bp[3] = htonl(vnode->fid.unique);
        bp[4] = htonl(upper_32_bits(req->pos));
        bp[5] = htonl(lower_32_bits(req->pos));
        bp[6] = 0;
        bp[7] = htonl(lower_32_bits(req->len));

        refcount_inc(&req->usage);
        call->cb_break = fc->cb_break;
        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call(call, &vnode->fid);
        return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}

/*
 * fetch data from a file
 */
int afs_fs_fetch_data(struct afs_fs_cursor *fc, struct afs_read *req)
{
        struct afs_vnode *vnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(vnode);
        __be32 *bp;

        if (upper_32_bits(req->pos) ||
            upper_32_bits(req->len) ||
            upper_32_bits(req->pos + req->len))
                return afs_fs_fetch_data64(fc, req);

        _enter("");

        call = afs_alloc_flat_call(net, &afs_RXFSFetchData, 24, (21 + 3 + 6) * 4);
        if (!call)
                return -ENOMEM;

        call->key = fc->key;
        call->reply[0] = vnode;
        call->reply[1] = NULL; /* volsync */
        call->reply[2] = req;
        call->expected_version = vnode->status.data_version;

        /* marshall the parameters */
        bp = call->request;
        bp[0] = htonl(FSFETCHDATA);
        bp[1] = htonl(vnode->fid.vid);
        bp[2] = htonl(vnode->fid.vnode);
        bp[3] = htonl(vnode->fid.unique);
        bp[4] = htonl(lower_32_bits(req->pos));
        bp[5] = htonl(lower_32_bits(req->len));

        refcount_inc(&req->usage);
        call->cb_break = fc->cb_break;
        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call(call, &vnode->fid);
        return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}

/*
 * deliver reply data to an FS.CreateFile or an FS.MakeDir
 */
static int afs_deliver_fs_create_vnode(struct afs_call *call)
{
        struct afs_vnode *vnode = call->reply[0];
        const __be32 *bp;
        int ret;

        _enter("{%u}", call->unmarshall);

        ret = afs_transfer_reply(call);
        if (ret < 0)
                return ret;

        /* unmarshall the reply once we've received all of it */
        bp = call->buffer;
        xdr_decode_AFSFid(&bp, call->reply[1]);
        if (afs_decode_status(call, &bp, call->reply[2], NULL, NULL, NULL) < 0 ||
            afs_decode_status(call, &bp, &vnode->status, vnode,
                              &call->expected_version, NULL) < 0)
                return afs_protocol_error(call, -EBADMSG);
        xdr_decode_AFSCallBack_raw(&bp, call->reply[3]);
        /* xdr_decode_AFSVolSync(&bp, call->reply[X]); */

        _leave(" = 0 [done]");
        return 0;
}

/*
 * FS.CreateFile and FS.MakeDir operation type
 */
static const struct afs_call_type afs_RXFSCreateFile = {
        .name           = "FS.CreateFile",
        .op             = afs_FS_CreateFile,
        .deliver        = afs_deliver_fs_create_vnode,
        .destructor     = afs_flat_call_destructor,
};

static const struct afs_call_type afs_RXFSMakeDir = {
        .name           = "FS.MakeDir",
        .op             = afs_FS_MakeDir,
        .deliver        = afs_deliver_fs_create_vnode,
        .destructor     = afs_flat_call_destructor,
};

/*
 * create a file or make a directory
 */
int afs_fs_create(struct afs_fs_cursor *fc,
                  const char *name,
                  umode_t mode,
                  u64 current_data_version,
                  struct afs_fid *newfid,
                  struct afs_file_status *newstatus,
                  struct afs_callback *newcb)
{
        struct afs_vnode *vnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(vnode);
        size_t namesz, reqsz, padsz;
        __be32 *bp;

        _enter("");

        namesz = strlen(name);
        padsz = (4 - (namesz & 3)) & 3;
        reqsz = (5 * 4) + namesz + padsz + (6 * 4);

        call = afs_alloc_flat_call(
                net, S_ISDIR(mode) ? &afs_RXFSMakeDir : &afs_RXFSCreateFile,
                reqsz, (3 + 21 + 21 + 3 + 6) * 4);
        if (!call)
                return -ENOMEM;

        call->key = fc->key;
        call->reply[0] = vnode;
        call->reply[1] = newfid;
        call->reply[2] = newstatus;
        call->reply[3] = newcb;
        call->expected_version = current_data_version + 1;

        /* marshall the parameters */
        bp = call->request;
        *bp++ = htonl(S_ISDIR(mode) ? FSMAKEDIR : FSCREATEFILE);
        *bp++ = htonl(vnode->fid.vid);
        *bp++ = htonl(vnode->fid.vnode);
        *bp++ = htonl(vnode->fid.unique);
        *bp++ = htonl(namesz);
        memcpy(bp, name, namesz);
        bp = (void *) bp + namesz;
        if (padsz > 0) {
                memset(bp, 0, padsz);
                bp = (void *) bp + padsz;
        }
        *bp++ = htonl(AFS_SET_MODE | AFS_SET_MTIME);
        *bp++ = htonl(vnode->vfs_inode.i_mtime.tv_sec); /* mtime */
        *bp++ = 0; /* owner */
        *bp++ = 0; /* group */
        *bp++ = htonl(mode & S_IALLUGO); /* unix mode */
        *bp++ = 0; /* segment size */

        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call(call, &vnode->fid);
        return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}

/*
 * deliver reply data to an FS.RemoveFile or FS.RemoveDir
 */
static int afs_deliver_fs_remove(struct afs_call *call)
{
        struct afs_vnode *vnode = call->reply[0];
        const __be32 *bp;
        int ret;

        _enter("{%u}", call->unmarshall);

        ret = afs_transfer_reply(call);
        if (ret < 0)
                return ret;

        /* unmarshall the reply once we've received all of it */
        bp = call->buffer;
        if (afs_decode_status(call, &bp, &vnode->status, vnode,
                              &call->expected_version, NULL) < 0)
                return afs_protocol_error(call, -EBADMSG);
        /* xdr_decode_AFSVolSync(&bp, call->reply[X]); */

        _leave(" = 0 [done]");
        return 0;
}

/*
 * FS.RemoveDir/FS.RemoveFile operation type
 */
static const struct afs_call_type afs_RXFSRemoveFile = {
        .name           = "FS.RemoveFile",
        .op             = afs_FS_RemoveFile,
        .deliver        = afs_deliver_fs_remove,
        .destructor     = afs_flat_call_destructor,
};

static const struct afs_call_type afs_RXFSRemoveDir = {
        .name           = "FS.RemoveDir",
        .op             = afs_FS_RemoveDir,
        .deliver        = afs_deliver_fs_remove,
        .destructor     = afs_flat_call_destructor,
};

/*
 * remove a file or directory
 */
int afs_fs_remove(struct afs_fs_cursor *fc, const char *name, bool isdir,
                  u64 current_data_version)
{
        struct afs_vnode *vnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(vnode);
        size_t namesz, reqsz, padsz;
        __be32 *bp;

        _enter("");

        namesz = strlen(name);
        padsz = (4 - (namesz & 3)) & 3;
        reqsz = (5 * 4) + namesz + padsz;

        call = afs_alloc_flat_call(
                net, isdir ? &afs_RXFSRemoveDir : &afs_RXFSRemoveFile,
                reqsz, (21 + 6) * 4);
        if (!call)
                return -ENOMEM;

        call->key = fc->key;
        call->reply[0] = vnode;
        call->expected_version = current_data_version + 1;

        /* marshall the parameters */
        bp = call->request;
        *bp++ = htonl(isdir ? FSREMOVEDIR : FSREMOVEFILE);
        *bp++ = htonl(vnode->fid.vid);
        *bp++ = htonl(vnode->fid.vnode);
        *bp++ = htonl(vnode->fid.unique);
        *bp++ = htonl(namesz);
        memcpy(bp, name, namesz);
        bp = (void *) bp + namesz;
        if (padsz > 0) {
                memset(bp, 0, padsz);
                bp = (void *) bp + padsz;
        }

        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call(call, &vnode->fid);
        return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}

/*
 * deliver reply data to an FS.Link
 */
static int afs_deliver_fs_link(struct afs_call *call)
{
        struct afs_vnode *dvnode = call->reply[0], *vnode = call->reply[1];
        const __be32 *bp;
        int ret;

        _enter("{%u}", call->unmarshall);

        ret = afs_transfer_reply(call);
        if (ret < 0)
                return ret;

        /* unmarshall the reply once we've received all of it */
        bp = call->buffer;
        if (afs_decode_status(call, &bp, &vnode->status, vnode, NULL, NULL) < 0 ||
            afs_decode_status(call, &bp, &dvnode->status, dvnode,
                              &call->expected_version, NULL) < 0)
                return afs_protocol_error(call, -EBADMSG);
        /* xdr_decode_AFSVolSync(&bp, call->reply[X]); */

        _leave(" = 0 [done]");
        return 0;
}

/*
 * FS.Link operation type
 */
static const struct afs_call_type afs_RXFSLink = {
        .name           = "FS.Link",
        .op             = afs_FS_Link,
        .deliver        = afs_deliver_fs_link,
        .destructor     = afs_flat_call_destructor,
};

/*
 * make a hard link
 */
int afs_fs_link(struct afs_fs_cursor *fc, struct afs_vnode *vnode,
                const char *name, u64 current_data_version)
{
        struct afs_vnode *dvnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(vnode);
        size_t namesz, reqsz, padsz;
        __be32 *bp;

        _enter("");

        namesz = strlen(name);
        padsz = (4 - (namesz & 3)) & 3;
        reqsz = (5 * 4) + namesz + padsz + (3 * 4);

        call = afs_alloc_flat_call(net, &afs_RXFSLink, reqsz, (21 + 21 + 6) * 4);
        if (!call)
                return -ENOMEM;

        call->key = fc->key;
        call->reply[0] = dvnode;
        call->reply[1] = vnode;
        call->expected_version = current_data_version + 1;

        /* marshall the parameters */
        bp = call->request;
        *bp++ = htonl(FSLINK);
        *bp++ = htonl(dvnode->fid.vid);
        *bp++ = htonl(dvnode->fid.vnode);
        *bp++ = htonl(dvnode->fid.unique);
        *bp++ = htonl(namesz);
        memcpy(bp, name, namesz);
        bp = (void *) bp + namesz;
        if (padsz > 0) {
                memset(bp, 0, padsz);
                bp = (void *) bp + padsz;
        }
        *bp++ = htonl(vnode->fid.vid);
        *bp++ = htonl(vnode->fid.vnode);
        *bp++ = htonl(vnode->fid.unique);

        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call(call, &vnode->fid);
        return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}

/*
 * deliver reply data to an FS.Symlink
 */
static int afs_deliver_fs_symlink(struct afs_call *call)
{
        struct afs_vnode *vnode = call->reply[0];
        const __be32 *bp;
        int ret;

        _enter("{%u}", call->unmarshall);

        ret = afs_transfer_reply(call);
        if (ret < 0)
                return ret;

        /* unmarshall the reply once we've received all of it */
        bp = call->buffer;
        xdr_decode_AFSFid(&bp, call->reply[1]);
        if (afs_decode_status(call, &bp, call->reply[2], NULL, NULL, NULL) ||
            afs_decode_status(call, &bp, &vnode->status, vnode,
                              &call->expected_version, NULL) < 0)
                return afs_protocol_error(call, -EBADMSG);
        /* xdr_decode_AFSVolSync(&bp, call->reply[X]); */

        _leave(" = 0 [done]");
        return 0;
}

/*
 * FS.Symlink operation type
 */
static const struct afs_call_type afs_RXFSSymlink = {
        .name           = "FS.Symlink",
        .op             = afs_FS_Symlink,
        .deliver        = afs_deliver_fs_symlink,
        .destructor     = afs_flat_call_destructor,
};

/*
 * create a symbolic link
 */
int afs_fs_symlink(struct afs_fs_cursor *fc,
                   const char *name,
                   const char *contents,
                   u64 current_data_version,
                   struct afs_fid *newfid,
                   struct afs_file_status *newstatus)
{
        struct afs_vnode *vnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(vnode);
        size_t namesz, reqsz, padsz, c_namesz, c_padsz;
        __be32 *bp;

        _enter("");

        namesz = strlen(name);
        padsz = (4 - (namesz & 3)) & 3;

        c_namesz = strlen(contents);
        c_padsz = (4 - (c_namesz & 3)) & 3;

        reqsz = (6 * 4) + namesz + padsz + c_namesz + c_padsz + (6 * 4);

        call = afs_alloc_flat_call(net, &afs_RXFSSymlink, reqsz,
                                   (3 + 21 + 21 + 6) * 4);
        if (!call)
                return -ENOMEM;

        call->key = fc->key;
        call->reply[0] = vnode;
        call->reply[1] = newfid;
        call->reply[2] = newstatus;
        call->expected_version = current_data_version + 1;

        /* marshall the parameters */
        bp = call->request;
        *bp++ = htonl(FSSYMLINK);
        *bp++ = htonl(vnode->fid.vid);
        *bp++ = htonl(vnode->fid.vnode);
        *bp++ = htonl(vnode->fid.unique);
        *bp++ = htonl(namesz);
        memcpy(bp, name, namesz);
        bp = (void *) bp + namesz;
        if (padsz > 0) {
                memset(bp, 0, padsz);
                bp = (void *) bp + padsz;
        }
        *bp++ = htonl(c_namesz);
        memcpy(bp, contents, c_namesz);
        bp = (void *) bp + c_namesz;
        if (c_padsz > 0) {
                memset(bp, 0, c_padsz);
                bp = (void *) bp + c_padsz;
        }
        *bp++ = htonl(AFS_SET_MODE | AFS_SET_MTIME);
        *bp++ = htonl(vnode->vfs_inode.i_mtime.tv_sec); /* mtime */
        *bp++ = 0; /* owner */
        *bp++ = 0; /* group */
        *bp++ = htonl(S_IRWXUGO); /* unix mode */
        *bp++ = 0; /* segment size */

        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call(call, &vnode->fid);
        return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}

/*
 * deliver reply data to an FS.Rename
 */
static int afs_deliver_fs_rename(struct afs_call *call)
{
        struct afs_vnode *orig_dvnode = call->reply[0], *new_dvnode = call->reply[1];
        const __be32 *bp;
        int ret;

        _enter("{%u}", call->unmarshall);

        ret = afs_transfer_reply(call);
        if (ret < 0)
                return ret;

        /* unmarshall the reply once we've received all of it */
        bp = call->buffer;
        if (afs_decode_status(call, &bp, &orig_dvnode->status, orig_dvnode,
                              &call->expected_version, NULL) < 0)
                return afs_protocol_error(call, -EBADMSG);
        if (new_dvnode != orig_dvnode &&
            afs_decode_status(call, &bp, &new_dvnode->status, new_dvnode,
                              &call->expected_version_2, NULL) < 0)
                return afs_protocol_error(call, -EBADMSG);
        /* xdr_decode_AFSVolSync(&bp, call->reply[X]); */

        _leave(" = 0 [done]");
        return 0;
}

/*
 * FS.Rename operation type
 */
static const struct afs_call_type afs_RXFSRename = {
        .name           = "FS.Rename",
        .op             = afs_FS_Rename,
        .deliver        = afs_deliver_fs_rename,
        .destructor     = afs_flat_call_destructor,
};

/*
 * create a symbolic link
 */
int afs_fs_rename(struct afs_fs_cursor *fc,
                  const char *orig_name,
                  struct afs_vnode *new_dvnode,
                  const char *new_name,
                  u64 current_orig_data_version,
                  u64 current_new_data_version)
{
        struct afs_vnode *orig_dvnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(orig_dvnode);
        size_t reqsz, o_namesz, o_padsz, n_namesz, n_padsz;
        __be32 *bp;

        _enter("");

        o_namesz = strlen(orig_name);
        o_padsz = (4 - (o_namesz & 3)) & 3;

        n_namesz = strlen(new_name);
        n_padsz = (4 - (n_namesz & 3)) & 3;

        reqsz = (4 * 4) +
                4 + o_namesz + o_padsz +
                (3 * 4) +
                4 + n_namesz + n_padsz;

        call = afs_alloc_flat_call(net, &afs_RXFSRename, reqsz, (21 + 21 + 6) * 4);
        if (!call)
                return -ENOMEM;

        call->key = fc->key;
        call->reply[0] = orig_dvnode;
        call->reply[1] = new_dvnode;
        call->expected_version = current_orig_data_version + 1;
        call->expected_version_2 = current_new_data_version + 1;

        /* marshall the parameters */
        bp = call->request;
        *bp++ = htonl(FSRENAME);
        *bp++ = htonl(orig_dvnode->fid.vid);
        *bp++ = htonl(orig_dvnode->fid.vnode);
        *bp++ = htonl(orig_dvnode->fid.unique);
        *bp++ = htonl(o_namesz);
        memcpy(bp, orig_name, o_namesz);
        bp = (void *) bp + o_namesz;
        if (o_padsz > 0) {
                memset(bp, 0, o_padsz);
                bp = (void *) bp + o_padsz;
        }

        *bp++ = htonl(new_dvnode->fid.vid);
        *bp++ = htonl(new_dvnode->fid.vnode);
        *bp++ = htonl(new_dvnode->fid.unique);
        *bp++ = htonl(n_namesz);
        memcpy(bp, new_name, n_namesz);
        bp = (void *) bp + n_namesz;
        if (n_padsz > 0) {
                memset(bp, 0, n_padsz);
                bp = (void *) bp + n_padsz;
        }

        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call(call, &orig_dvnode->fid);
        return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}

/*
 * deliver reply data to an FS.StoreData
 */
static int afs_deliver_fs_store_data(struct afs_call *call)
{
        struct afs_vnode *vnode = call->reply[0];
        const __be32 *bp;
        int ret;

        _enter("");

        ret = afs_transfer_reply(call);
        if (ret < 0)
                return ret;

        /* unmarshall the reply once we've received all of it */
        bp = call->buffer;
        if (afs_decode_status(call, &bp, &vnode->status, vnode,
                              &call->expected_version, NULL) < 0)
                return afs_protocol_error(call, -EBADMSG);
        /* xdr_decode_AFSVolSync(&bp, call->reply[X]); */

        afs_pages_written_back(vnode, call);

        _leave(" = 0 [done]");
        return 0;
}

/*
 * FS.StoreData operation type
 */
static const struct afs_call_type afs_RXFSStoreData = {
        .name           = "FS.StoreData",
        .op             = afs_FS_StoreData,
        .deliver        = afs_deliver_fs_store_data,
        .destructor     = afs_flat_call_destructor,
};

static const struct afs_call_type afs_RXFSStoreData64 = {
        .name           = "FS.StoreData64",
        .op             = afs_FS_StoreData64,
        .deliver        = afs_deliver_fs_store_data,
        .destructor     = afs_flat_call_destructor,
};

/*
 * store a set of pages to a very large file
 */
static int afs_fs_store_data64(struct afs_fs_cursor *fc,
                               struct address_space *mapping,
                               pgoff_t first, pgoff_t last,
                               unsigned offset, unsigned to,
                               loff_t size, loff_t pos, loff_t i_size)
{
        struct afs_vnode *vnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(vnode);
        __be32 *bp;

        _enter(",%x,{%x:%u},,",
               key_serial(fc->key), vnode->fid.vid, vnode->fid.vnode);

        call = afs_alloc_flat_call(net, &afs_RXFSStoreData64,
                                   (4 + 6 + 3 * 2) * 4,
                                   (21 + 6) * 4);
        if (!call)
                return -ENOMEM;

        call->key = fc->key;
        call->mapping = mapping;
        call->reply[0] = vnode;
        call->first = first;
        call->last = last;
        call->first_offset = offset;
        call->last_to = to;
        call->send_pages = true;
        call->expected_version = vnode->status.data_version + 1;

        /* marshall the parameters */
        bp = call->request;
        *bp++ = htonl(FSSTOREDATA64);
        *bp++ = htonl(vnode->fid.vid);
        *bp++ = htonl(vnode->fid.vnode);
        *bp++ = htonl(vnode->fid.unique);

        *bp++ = htonl(AFS_SET_MTIME); /* mask */
        *bp++ = htonl(vnode->vfs_inode.i_mtime.tv_sec); /* mtime */
        *bp++ = 0; /* owner */
        *bp++ = 0; /* group */
        *bp++ = 0; /* unix mode */
        *bp++ = 0; /* segment size */

        *bp++ = htonl(pos >> 32);
        *bp++ = htonl((u32) pos);
        *bp++ = htonl(size >> 32);
        *bp++ = htonl((u32) size);
        *bp++ = htonl(i_size >> 32);
        *bp++ = htonl((u32) i_size);

        trace_afs_make_fs_call(call, &vnode->fid);
        return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}

/*
 * store a set of pages
 */
int afs_fs_store_data(struct afs_fs_cursor *fc, struct address_space *mapping,
                      pgoff_t first, pgoff_t last,
                      unsigned offset, unsigned to)
{
        struct afs_vnode *vnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(vnode);
        loff_t size, pos, i_size;
        __be32 *bp;

        _enter(",%x,{%x:%u},,",
               key_serial(fc->key), vnode->fid.vid, vnode->fid.vnode);

        size = (loff_t)to - (loff_t)offset;
        if (first != last)
                size += (loff_t)(last - first) << PAGE_SHIFT;
        pos = (loff_t)first << PAGE_SHIFT;
        pos += offset;

        i_size = i_size_read(&vnode->vfs_inode);
        if (pos + size > i_size)
                i_size = size + pos;

        _debug("size %llx, at %llx, i_size %llx",
               (unsigned long long) size, (unsigned long long) pos,
               (unsigned long long) i_size);

        if (pos >> 32 || i_size >> 32 || size >> 32 || (pos + size) >> 32)
                return afs_fs_store_data64(fc, mapping, first, last, offset, to,
                                           size, pos, i_size);

        call = afs_alloc_flat_call(net, &afs_RXFSStoreData,
                                   (4 + 6 + 3) * 4,
                                   (21 + 6) * 4);
        if (!call)
                return -ENOMEM;

        call->key = fc->key;
        call->mapping = mapping;
        call->reply[0] = vnode;
        call->first = first;
        call->last = last;
        call->first_offset = offset;
        call->last_to = to;
        call->send_pages = true;
        call->expected_version = vnode->status.data_version + 1;

        /* marshall the parameters */
        bp = call->request;
        *bp++ = htonl(FSSTOREDATA);
        *bp++ = htonl(vnode->fid.vid);
        *bp++ = htonl(vnode->fid.vnode);
        *bp++ = htonl(vnode->fid.unique);

        *bp++ = htonl(AFS_SET_MTIME); /* mask */
        *bp++ = htonl(vnode->vfs_inode.i_mtime.tv_sec); /* mtime */
        *bp++ = 0; /* owner */
        *bp++ = 0; /* group */
        *bp++ = 0; /* unix mode */
        *bp++ = 0; /* segment size */

        *bp++ = htonl(pos);
        *bp++ = htonl(size);
        *bp++ = htonl(i_size);

        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call(call, &vnode->fid);
        return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}

/*
 * deliver reply data to an FS.StoreStatus
 */
static int afs_deliver_fs_store_status(struct afs_call *call)
{
        struct afs_vnode *vnode = call->reply[0];
        const __be32 *bp;
        int ret;

        _enter("");

        ret = afs_transfer_reply(call);
        if (ret < 0)
                return ret;

        /* unmarshall the reply once we've received all of it */
        bp = call->buffer;
        if (afs_decode_status(call, &bp, &vnode->status, vnode,
                              &call->expected_version, NULL) < 0)
                return afs_protocol_error(call, -EBADMSG);
        /* xdr_decode_AFSVolSync(&bp, call->reply[X]); */

        _leave(" = 0 [done]");
        return 0;
}

/*
 * FS.StoreStatus operation type
 */
static const struct afs_call_type afs_RXFSStoreStatus = {
        .name           = "FS.StoreStatus",
        .op             = afs_FS_StoreStatus,
        .deliver        = afs_deliver_fs_store_status,
        .destructor     = afs_flat_call_destructor,
};

static const struct afs_call_type afs_RXFSStoreData_as_Status = {
        .name           = "FS.StoreData",
        .op             = afs_FS_StoreData,
        .deliver        = afs_deliver_fs_store_status,
        .destructor     = afs_flat_call_destructor,
};

static const struct afs_call_type afs_RXFSStoreData64_as_Status = {
        .name           = "FS.StoreData64",
        .op             = afs_FS_StoreData64,
        .deliver        = afs_deliver_fs_store_status,
        .destructor     = afs_flat_call_destructor,
};

/*
 * set the attributes on a very large file, using FS.StoreData rather than
 * FS.StoreStatus so as to alter the file size also
 */
static int afs_fs_setattr_size64(struct afs_fs_cursor *fc, struct iattr *attr)
{
        struct afs_vnode *vnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(vnode);
        __be32 *bp;

        _enter(",%x,{%x:%u},,",
               key_serial(fc->key), vnode->fid.vid, vnode->fid.vnode);

        ASSERT(attr->ia_valid & ATTR_SIZE);

        call = afs_alloc_flat_call(net, &afs_RXFSStoreData64_as_Status,
                                   (4 + 6 + 3 * 2) * 4,
                                   (21 + 6) * 4);
        if (!call)
                return -ENOMEM;

        call->key = fc->key;
        call->reply[0] = vnode;
        call->expected_version = vnode->status.data_version + 1;

        /* marshall the parameters */
        bp = call->request;
        *bp++ = htonl(FSSTOREDATA64);
        *bp++ = htonl(vnode->fid.vid);
        *bp++ = htonl(vnode->fid.vnode);
        *bp++ = htonl(vnode->fid.unique);

        xdr_encode_AFS_StoreStatus(&bp, attr);

        *bp++ = 0;                              /* position of start of write */
        *bp++ = 0;
        *bp++ = 0;                              /* size of write */
        *bp++ = 0;
        *bp++ = htonl(attr->ia_size >> 32);     /* new file length */
        *bp++ = htonl((u32) attr->ia_size);

        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call(call, &vnode->fid);
        return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}

/*
 * set the attributes on a file, using FS.StoreData rather than FS.StoreStatus
 * so as to alter the file size also
 */
static int afs_fs_setattr_size(struct afs_fs_cursor *fc, struct iattr *attr)
{
        struct afs_vnode *vnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(vnode);
        __be32 *bp;

        _enter(",%x,{%x:%u},,",
               key_serial(fc->key), vnode->fid.vid, vnode->fid.vnode);

        ASSERT(attr->ia_valid & ATTR_SIZE);
        if (attr->ia_size >> 32)
                return afs_fs_setattr_size64(fc, attr);

        call = afs_alloc_flat_call(net, &afs_RXFSStoreData_as_Status,
                                   (4 + 6 + 3) * 4,
                                   (21 + 6) * 4);
        if (!call)
                return -ENOMEM;

        call->key = fc->key;
        call->reply[0] = vnode;
        call->expected_version = vnode->status.data_version + 1;

        /* marshall the parameters */
        bp = call->request;
        *bp++ = htonl(FSSTOREDATA);
        *bp++ = htonl(vnode->fid.vid);
        *bp++ = htonl(vnode->fid.vnode);
        *bp++ = htonl(vnode->fid.unique);

        xdr_encode_AFS_StoreStatus(&bp, attr);

        *bp++ = 0;                              /* position of start of write */
        *bp++ = 0;                              /* size of write */
        *bp++ = htonl(attr->ia_size);           /* new file length */

        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call(call, &vnode->fid);
        return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}

/*
 * set the attributes on a file, using FS.StoreData if there's a change in file
 * size, and FS.StoreStatus otherwise
 */
int afs_fs_setattr(struct afs_fs_cursor *fc, struct iattr *attr)
{
        struct afs_vnode *vnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(vnode);
        __be32 *bp;

        if (attr->ia_valid & ATTR_SIZE)
                return afs_fs_setattr_size(fc, attr);

        _enter(",%x,{%x:%u},,",
               key_serial(fc->key), vnode->fid.vid, vnode->fid.vnode);

        call = afs_alloc_flat_call(net, &afs_RXFSStoreStatus,
                                   (4 + 6) * 4,
                                   (21 + 6) * 4);
        if (!call)
                return -ENOMEM;

        call->key = fc->key;
        call->reply[0] = vnode;
        call->expected_version = vnode->status.data_version;

        /* marshall the parameters */
        bp = call->request;
        *bp++ = htonl(FSSTORESTATUS);
        *bp++ = htonl(vnode->fid.vid);
        *bp++ = htonl(vnode->fid.vnode);
        *bp++ = htonl(vnode->fid.unique);

        xdr_encode_AFS_StoreStatus(&bp, attr);

        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call(call, &vnode->fid);
        return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}

/*
 * deliver reply data to an FS.GetVolumeStatus
 */
static int afs_deliver_fs_get_volume_status(struct afs_call *call)
{
        const __be32 *bp;
        char *p;
        int ret;

        _enter("{%u}", call->unmarshall);

        switch (call->unmarshall) {
        case 0:
                call->offset = 0;
                call->unmarshall++;

                /* extract the returned status record */
        case 1:
                _debug("extract status");
                ret = afs_extract_data(call, call->buffer,
                                       12 * 4, true);
                if (ret < 0)
                        return ret;

                bp = call->buffer;
                xdr_decode_AFSFetchVolumeStatus(&bp, call->reply[1]);
                call->offset = 0;
                call->unmarshall++;

                /* extract the volume name length */
        case 2:
                ret = afs_extract_data(call, &call->tmp, 4, true);
                if (ret < 0)
                        return ret;

                call->count = ntohl(call->tmp);
                _debug("volname length: %u", call->count);
                if (call->count >= AFSNAMEMAX)
                        return afs_protocol_error(call, -EBADMSG);
                call->offset = 0;
                call->unmarshall++;

                /* extract the volume name */
        case 3:
                _debug("extract volname");
                if (call->count > 0) {
                        ret = afs_extract_data(call, call->reply[2],
                                               call->count, true);
                        if (ret < 0)
                                return ret;
                }

                p = call->reply[2];
                p[call->count] = 0;
                _debug("volname '%s'", p);

                call->offset = 0;
                call->unmarshall++;

                /* extract the volume name padding */
                if ((call->count & 3) == 0) {
                        call->unmarshall++;
                        goto no_volname_padding;
                }
                call->count = 4 - (call->count & 3);

        case 4:
                ret = afs_extract_data(call, call->buffer,
                                       call->count, true);
                if (ret < 0)
                        return ret;

                call->offset = 0;
                call->unmarshall++;
        no_volname_padding:

                /* extract the offline message length */
        case 5:
                ret = afs_extract_data(call, &call->tmp, 4, true);
                if (ret < 0)
                        return ret;

                call->count = ntohl(call->tmp);
                _debug("offline msg length: %u", call->count);
                if (call->count >= AFSNAMEMAX)
                        return afs_protocol_error(call, -EBADMSG);
                call->offset = 0;
                call->unmarshall++;

                /* extract the offline message */
        case 6:
                _debug("extract offline");
                if (call->count > 0) {
                        ret = afs_extract_data(call, call->reply[2],
                                               call->count, true);
                        if (ret < 0)
                                return ret;
                }

                p = call->reply[2];
                p[call->count] = 0;
                _debug("offline '%s'", p);

                call->offset = 0;
                call->unmarshall++;

                /* extract the offline message padding */
                if ((call->count & 3) == 0) {
                        call->unmarshall++;
                        goto no_offline_padding;
                }
                call->count = 4 - (call->count & 3);

        case 7:
                ret = afs_extract_data(call, call->buffer,
                                       call->count, true);
                if (ret < 0)
                        return ret;

                call->offset = 0;
                call->unmarshall++;
        no_offline_padding:

                /* extract the message of the day length */
        case 8:
                ret = afs_extract_data(call, &call->tmp, 4, true);
                if (ret < 0)
                        return ret;

                call->count = ntohl(call->tmp);
                _debug("motd length: %u", call->count);
                if (call->count >= AFSNAMEMAX)
                        return afs_protocol_error(call, -EBADMSG);
                call->offset = 0;
                call->unmarshall++;

                /* extract the message of the day */
        case 9:
                _debug("extract motd");
                if (call->count > 0) {
                        ret = afs_extract_data(call, call->reply[2],
                                               call->count, true);
                        if (ret < 0)
                                return ret;
                }

                p = call->reply[2];
                p[call->count] = 0;
                _debug("motd '%s'", p);

                call->offset = 0;
                call->unmarshall++;

                /* extract the message of the day padding */
                call->count = (4 - (call->count & 3)) & 3;

        case 10:
                ret = afs_extract_data(call, call->buffer,
                                       call->count, false);
                if (ret < 0)
                        return ret;

                call->offset = 0;
                call->unmarshall++;
        case 11:
                break;
        }

        _leave(" = 0 [done]");
        return 0;
}

/*
 * destroy an FS.GetVolumeStatus call
 */
static void afs_get_volume_status_call_destructor(struct afs_call *call)
{
        kfree(call->reply[2]);
        call->reply[2] = NULL;
        afs_flat_call_destructor(call);
}

/*
 * FS.GetVolumeStatus operation type
 */
static const struct afs_call_type afs_RXFSGetVolumeStatus = {
        .name           = "FS.GetVolumeStatus",
        .op             = afs_FS_GetVolumeStatus,
        .deliver        = afs_deliver_fs_get_volume_status,
        .destructor     = afs_get_volume_status_call_destructor,
};

/*
 * fetch the status of a volume
 */
int afs_fs_get_volume_status(struct afs_fs_cursor *fc,
                             struct afs_volume_status *vs)
{
        struct afs_vnode *vnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(vnode);
        __be32 *bp;
        void *tmpbuf;

        _enter("");

        tmpbuf = kmalloc(AFSOPAQUEMAX, GFP_KERNEL);
        if (!tmpbuf)
                return -ENOMEM;

        call = afs_alloc_flat_call(net, &afs_RXFSGetVolumeStatus, 2 * 4, 12 * 4);
        if (!call) {
                kfree(tmpbuf);
                return -ENOMEM;
        }

        call->key = fc->key;
        call->reply[0] = vnode;
        call->reply[1] = vs;
        call->reply[2] = tmpbuf;

        /* marshall the parameters */
        bp = call->request;
        bp[0] = htonl(FSGETVOLUMESTATUS);
        bp[1] = htonl(vnode->fid.vid);

        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call(call, &vnode->fid);
        return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}

/*
 * deliver reply data to an FS.SetLock, FS.ExtendLock or FS.ReleaseLock
 */
static int afs_deliver_fs_xxxx_lock(struct afs_call *call)
{
        const __be32 *bp;
        int ret;

        _enter("{%u}", call->unmarshall);

        ret = afs_transfer_reply(call);
        if (ret < 0)
                return ret;

        /* unmarshall the reply once we've received all of it */
        bp = call->buffer;
        /* xdr_decode_AFSVolSync(&bp, call->reply[X]); */

        _leave(" = 0 [done]");
        return 0;
}

/*
 * FS.SetLock operation type
 */
static const struct afs_call_type afs_RXFSSetLock = {
        .name           = "FS.SetLock",
        .op             = afs_FS_SetLock,
        .deliver        = afs_deliver_fs_xxxx_lock,
        .destructor     = afs_flat_call_destructor,
};

/*
 * FS.ExtendLock operation type
 */
static const struct afs_call_type afs_RXFSExtendLock = {
        .name           = "FS.ExtendLock",
        .op             = afs_FS_ExtendLock,
        .deliver        = afs_deliver_fs_xxxx_lock,
        .destructor     = afs_flat_call_destructor,
};

/*
 * FS.ReleaseLock operation type
 */
static const struct afs_call_type afs_RXFSReleaseLock = {
        .name           = "FS.ReleaseLock",
        .op             = afs_FS_ReleaseLock,
        .deliver        = afs_deliver_fs_xxxx_lock,
        .destructor     = afs_flat_call_destructor,
};

/*
 * Set a lock on a file
 */
int afs_fs_set_lock(struct afs_fs_cursor *fc, afs_lock_type_t type)
{
        struct afs_vnode *vnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(vnode);
        __be32 *bp;

        _enter("");

        call = afs_alloc_flat_call(net, &afs_RXFSSetLock, 5 * 4, 6 * 4);
        if (!call)
                return -ENOMEM;

        call->key = fc->key;
        call->reply[0] = vnode;

        /* marshall the parameters */
        bp = call->request;
        *bp++ = htonl(FSSETLOCK);
        *bp++ = htonl(vnode->fid.vid);
        *bp++ = htonl(vnode->fid.vnode);
        *bp++ = htonl(vnode->fid.unique);
        *bp++ = htonl(type);

        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call(call, &vnode->fid);
        return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}

/*
 * extend a lock on a file
 */
int afs_fs_extend_lock(struct afs_fs_cursor *fc)
{
        struct afs_vnode *vnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(vnode);
        __be32 *bp;

        _enter("");

        call = afs_alloc_flat_call(net, &afs_RXFSExtendLock, 4 * 4, 6 * 4);
        if (!call)
                return -ENOMEM;

        call->key = fc->key;
        call->reply[0] = vnode;

        /* marshall the parameters */
        bp = call->request;
        *bp++ = htonl(FSEXTENDLOCK);
        *bp++ = htonl(vnode->fid.vid);
        *bp++ = htonl(vnode->fid.vnode);
        *bp++ = htonl(vnode->fid.unique);

        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call(call, &vnode->fid);
        return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}

/*
 * release a lock on a file
 */
int afs_fs_release_lock(struct afs_fs_cursor *fc)
{
        struct afs_vnode *vnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(vnode);
        __be32 *bp;

        _enter("");

        call = afs_alloc_flat_call(net, &afs_RXFSReleaseLock, 4 * 4, 6 * 4);
        if (!call)
                return -ENOMEM;

        call->key = fc->key;
        call->reply[0] = vnode;

        /* marshall the parameters */
        bp = call->request;
        *bp++ = htonl(FSRELEASELOCK);
        *bp++ = htonl(vnode->fid.vid);
        *bp++ = htonl(vnode->fid.vnode);
        *bp++ = htonl(vnode->fid.unique);

        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call(call, &vnode->fid);
        return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}

/*
 * Deliver reply data to an FS.GiveUpAllCallBacks operation.
 */
static int afs_deliver_fs_give_up_all_callbacks(struct afs_call *call)
{
        return afs_transfer_reply(call);
}

/*
 * FS.GiveUpAllCallBacks operation type
 */
static const struct afs_call_type afs_RXFSGiveUpAllCallBacks = {
        .name           = "FS.GiveUpAllCallBacks",
        .op             = afs_FS_GiveUpAllCallBacks,
        .deliver        = afs_deliver_fs_give_up_all_callbacks,
        .destructor     = afs_flat_call_destructor,
};

/*
 * Flush all the callbacks we have on a server.
 */
int afs_fs_give_up_all_callbacks(struct afs_net *net,
                                 struct afs_server *server,
                                 struct afs_addr_cursor *ac,
                                 struct key *key)
{
        struct afs_call *call;
        __be32 *bp;

        _enter("");

        call = afs_alloc_flat_call(net, &afs_RXFSGiveUpAllCallBacks, 1 * 4, 0);
        if (!call)
                return -ENOMEM;

        call->key = key;

        /* marshall the parameters */
        bp = call->request;
        *bp++ = htonl(FSGIVEUPALLCALLBACKS);

        /* Can't take a ref on server */
        return afs_make_call(ac, call, GFP_NOFS, false);
}

/*
 * Deliver reply data to an FS.GetCapabilities operation.

 */
static int afs_deliver_fs_get_capabilities(struct afs_call *call)
{
        u32 count;
        int ret;

        _enter("{%u,%zu/%u}", call->unmarshall, call->offset, call->count);

again:
        switch (call->unmarshall) {
        case 0:
                call->offset = 0;
                call->unmarshall++;

                /* Extract the capabilities word count */
        case 1:
                ret = afs_extract_data(call, &call->tmp,
                                       1 * sizeof(__be32),
                                       true);
                if (ret < 0)
                        return ret;

                count = ntohl(call->tmp);

                call->count = count;
                call->count2 = count;
                call->offset = 0;
                call->unmarshall++;

                /* Extract capabilities words */
        case 2:
                count = min(call->count, 16U);
                ret = afs_extract_data(call, call->buffer,
                                       count * sizeof(__be32),
                                       call->count > 16);
                if (ret < 0)
                        return ret;

                /* TODO: Examine capabilities */

                call->count -= count;
                if (call->count > 0)
                        goto again;
                call->offset = 0;
                call->unmarshall++;
                break;
        }

        _leave(" = 0 [done]");
        return 0;
}

/*
 * FS.GetCapabilities operation type
 */
static const struct afs_call_type afs_RXFSGetCapabilities = {
        .name           = "FS.GetCapabilities",
        .op             = afs_FS_GetCapabilities,
        .deliver        = afs_deliver_fs_get_capabilities,
        .destructor     = afs_flat_call_destructor,
};

/*
 * Probe a fileserver for the capabilities that it supports.  This can
 * return up to 196 words.
 */
int afs_fs_get_capabilities(struct afs_net *net,
                            struct afs_server *server,
                            struct afs_addr_cursor *ac,
                            struct key *key)
{
        struct afs_call *call;
        __be32 *bp;

        _enter("");

        call = afs_alloc_flat_call(net, &afs_RXFSGetCapabilities, 1 * 4, 16 * 4);
        if (!call)
                return -ENOMEM;

        call->key = key;

        /* marshall the parameters */
        bp = call->request;
        *bp++ = htonl(FSGETCAPABILITIES);

        /* Can't take a ref on server */
        trace_afs_make_fs_call(call, NULL);
        return afs_make_call(ac, call, GFP_NOFS, false);
}

/*
 * Deliver reply data to an FS.FetchStatus with no vnode.
 */
static int afs_deliver_fs_fetch_status(struct afs_call *call)
{
        struct afs_file_status *status = call->reply[1];
        struct afs_callback *callback = call->reply[2];
        struct afs_volsync *volsync = call->reply[3];
        struct afs_vnode *vnode = call->reply[0];
        const __be32 *bp;
        int ret;

        ret = afs_transfer_reply(call);
        if (ret < 0)
                return ret;

        _enter("{%x:%u}", vnode->fid.vid, vnode->fid.vnode);

        /* unmarshall the reply once we've received all of it */
        bp = call->buffer;
        afs_decode_status(call, &bp, status, vnode,
                          &call->expected_version, NULL);
        callback[call->count].version   = ntohl(bp[0]);
        callback[call->count].expiry    = ntohl(bp[1]);
        callback[call->count].type      = ntohl(bp[2]);
        if (vnode)
                xdr_decode_AFSCallBack(call, vnode, &bp);
        else
                bp += 3;
        if (volsync)
                xdr_decode_AFSVolSync(&bp, volsync);

        _leave(" = 0 [done]");
        return 0;
}

/*
 * FS.FetchStatus operation type
 */
static const struct afs_call_type afs_RXFSFetchStatus = {
        .name           = "FS.FetchStatus",
        .op             = afs_FS_FetchStatus,
        .deliver        = afs_deliver_fs_fetch_status,
        .destructor     = afs_flat_call_destructor,
};

/*
 * Fetch the status information for a fid without needing a vnode handle.
 */
int afs_fs_fetch_status(struct afs_fs_cursor *fc,
                        struct afs_net *net,
                        struct afs_fid *fid,
                        struct afs_file_status *status,
                        struct afs_callback *callback,
                        struct afs_volsync *volsync)
{
        struct afs_call *call;
        __be32 *bp;

        _enter(",%x,{%x:%u},,",
               key_serial(fc->key), fid->vid, fid->vnode);

        call = afs_alloc_flat_call(net, &afs_RXFSFetchStatus, 16, (21 + 3 + 6) * 4);
        if (!call) {
                fc->ac.error = -ENOMEM;
                return -ENOMEM;
        }

        call->key = fc->key;
        call->reply[0] = NULL; /* vnode for fid[0] */
        call->reply[1] = status;
        call->reply[2] = callback;
        call->reply[3] = volsync;
        call->expected_version = 1; /* vnode->status.data_version */

        /* marshall the parameters */
        bp = call->request;
        bp[0] = htonl(FSFETCHSTATUS);
        bp[1] = htonl(fid->vid);
        bp[2] = htonl(fid->vnode);
        bp[3] = htonl(fid->unique);

        call->cb_break = fc->cb_break;
        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call(call, fid);
        return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}

/*
 * Deliver reply data to an FS.InlineBulkStatus call
 */
static int afs_deliver_fs_inline_bulk_status(struct afs_call *call)
{
        struct afs_file_status *statuses;
        struct afs_callback *callbacks;
        struct afs_vnode *vnode = call->reply[0];
        const __be32 *bp;
        u32 tmp;
        int ret;

        _enter("{%u}", call->unmarshall);

        switch (call->unmarshall) {
        case 0:
                call->offset = 0;
                call->unmarshall++;

                /* Extract the file status count and array in two steps */
        case 1:
                _debug("extract status count");
                ret = afs_extract_data(call, &call->tmp, 4, true);
                if (ret < 0)
                        return ret;

                tmp = ntohl(call->tmp);
                _debug("status count: %u/%u", tmp, call->count2);
                if (tmp != call->count2)
                        return afs_protocol_error(call, -EBADMSG);

                call->count = 0;
                call->unmarshall++;
        more_counts:
                call->offset = 0;

        case 2:
                _debug("extract status array %u", call->count);
                ret = afs_extract_data(call, call->buffer, 21 * 4, true);
                if (ret < 0)
                        return ret;

                bp = call->buffer;
                statuses = call->reply[1];
                if (afs_decode_status(call, &bp, &statuses[call->count],
                                      call->count == 0 ? vnode : NULL,
                                      NULL, NULL) < 0)
                        return afs_protocol_error(call, -EBADMSG);

                call->count++;
                if (call->count < call->count2)
                        goto more_counts;

                call->count = 0;
                call->unmarshall++;
                call->offset = 0;

                /* Extract the callback count and array in two steps */
        case 3:
                _debug("extract CB count");
                ret = afs_extract_data(call, &call->tmp, 4, true);
                if (ret < 0)
                        return ret;

                tmp = ntohl(call->tmp);
                _debug("CB count: %u", tmp);
                if (tmp != call->count2)
                        return afs_protocol_error(call, -EBADMSG);
                call->count = 0;
                call->unmarshall++;
        more_cbs:
                call->offset = 0;

        case 4:
                _debug("extract CB array");
                ret = afs_extract_data(call, call->buffer, 3 * 4, true);
                if (ret < 0)
                        return ret;

                _debug("unmarshall CB array");
                bp = call->buffer;
                callbacks = call->reply[2];
                callbacks[call->count].version  = ntohl(bp[0]);
                callbacks[call->count].expiry   = ntohl(bp[1]);
                callbacks[call->count].type     = ntohl(bp[2]);
                statuses = call->reply[1];
                if (call->count == 0 && vnode && statuses[0].abort_code == 0)
                        xdr_decode_AFSCallBack(call, vnode, &bp);
                call->count++;
                if (call->count < call->count2)
                        goto more_cbs;

                call->offset = 0;
                call->unmarshall++;

        case 5:
                ret = afs_extract_data(call, call->buffer, 6 * 4, false);
                if (ret < 0)
                        return ret;

                bp = call->buffer;
                if (call->reply[3])
                        xdr_decode_AFSVolSync(&bp, call->reply[3]);

                call->offset = 0;
                call->unmarshall++;

        case 6:
                break;
        }

        _leave(" = 0 [done]");
        return 0;
}

/*
 * FS.InlineBulkStatus operation type
 */
static const struct afs_call_type afs_RXFSInlineBulkStatus = {
        .name           = "FS.InlineBulkStatus",
        .op             = afs_FS_InlineBulkStatus,
        .deliver        = afs_deliver_fs_inline_bulk_status,
        .destructor     = afs_flat_call_destructor,
};

/*
 * Fetch the status information for up to 50 files
 */
int afs_fs_inline_bulk_status(struct afs_fs_cursor *fc,
                              struct afs_net *net,
                              struct afs_fid *fids,
                              struct afs_file_status *statuses,
                              struct afs_callback *callbacks,
                              unsigned int nr_fids,
                              struct afs_volsync *volsync)
{
        struct afs_call *call;
        __be32 *bp;
        int i;

        _enter(",%x,{%x:%u},%u",
               key_serial(fc->key), fids[0].vid, fids[1].vnode, nr_fids);

        call = afs_alloc_flat_call(net, &afs_RXFSInlineBulkStatus,
                                   (2 + nr_fids * 3) * 4,
                                   21 * 4);
        if (!call) {
                fc->ac.error = -ENOMEM;
                return -ENOMEM;
        }

        call->key = fc->key;
        call->reply[0] = NULL; /* vnode for fid[0] */
        call->reply[1] = statuses;
        call->reply[2] = callbacks;
        call->reply[3] = volsync;
        call->count2 = nr_fids;

        /* marshall the parameters */
        bp = call->request;
        *bp++ = htonl(FSINLINEBULKSTATUS);
        *bp++ = htonl(nr_fids);
        for (i = 0; i < nr_fids; i++) {
                *bp++ = htonl(fids[i].vid);
                *bp++ = htonl(fids[i].vnode);
                *bp++ = htonl(fids[i].unique);
        }

        call->cb_break = fc->cb_break;
        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call(call, &fids[0]);
        return afs_make_call(&fc->ac, call, GFP_NOFS, false);
}