// SPDX-License-Identifier: GPL-2.0-or-later
/* AFS File Server client stubs
 *
 * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 */

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

/*
 * 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]));
}

/*
 * decode an AFSFetchStatus block
 */
static void xdr_decode_AFSFetchStatus(const __be32 **_bp,
                                      struct afs_call *call,
                                      struct afs_status_cb *scb)
{
        const struct afs_xdr_AFSFetchStatus *xdr = (const void *)*_bp;
        struct afs_file_status *status = &scb->status;
        bool inline_error = (call->operation_ID == afs_FS_InlineBulkStatus);
        u64 data_version, size;
        u32 type, abort_code;

        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;
                        scb->have_error = true;
                        goto advance;
                }

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

        if (abort_code != 0 && inline_error) {
                status->abort_code = abort_code;
                scb->have_error = true;
                goto advance;
        }

        type = ntohl(xdr->type);
        switch (type) {
        case AFS_FTYPE_FILE:
        case AFS_FTYPE_DIR:
        case AFS_FTYPE_SYMLINK:
                status->type = type;
                break;
        default:
                goto bad;
        }

        status->nlink           = ntohl(xdr->nlink);
        status->author          = ntohl(xdr->author);
        status->owner           = ntohl(xdr->owner);
        status->caller_access   = ntohl(xdr->caller_access); /* Ticket dependent */
        status->anon_access     = ntohl(xdr->anon_access);
        status->mode            = ntohl(xdr->mode) & S_IALLUGO;
        status->group           = ntohl(xdr->group);
        status->lock_count      = ntohl(xdr->lock_count);

        status->mtime_client.tv_sec = ntohl(xdr->mtime_client);
        status->mtime_client.tv_nsec = 0;
        status->mtime_server.tv_sec = ntohl(xdr->mtime_server);
        status->mtime_server.tv_nsec = 0;

        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;
        status->data_version = data_version;
        scb->have_status = true;
advance:
        *_bp = (const void *)*_bp + sizeof(*xdr);
        return;

bad:
        xdr_dump_bad(*_bp);
        afs_protocol_error(call, afs_eproto_bad_status);
        goto advance;
}

static time64_t xdr_decode_expiry(struct afs_call *call, u32 expiry)
{
        return ktime_divns(call->reply_time, NSEC_PER_SEC) + expiry;
}

static void xdr_decode_AFSCallBack(const __be32 **_bp,
                                   struct afs_call *call,
                                   struct afs_status_cb *scb)
{
        struct afs_callback *cb = &scb->callback;
        const __be32 *bp = *_bp;

        bp++; /* version */
        cb->expires_at  = xdr_decode_expiry(call, ntohl(*bp++));
        bp++; /* type */
        scb->have_cb    = true;
        *_bp = bp;
}

/*
 * decode an AFSVolSync block
 */
static void xdr_decode_AFSVolSync(const __be32 **_bp,
                                  struct afs_volsync *volsync)
{
        const __be32 *bp = *_bp;
        u32 creation;

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

        if (volsync)
                volsync->creation = creation;
}

/*
 * 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++);
        vs->vol_copy_date       = 0;
        vs->vol_backup_date     = 0;
        *_bp = bp;
}

/*
 * deliver reply data to an FS.FetchStatus
 */
static int afs_deliver_fs_fetch_status(struct afs_call *call)
{
        struct afs_operation *op = call->op;
        struct afs_vnode_param *vp = &op->file[op->fetch_status.which];
        const __be32 *bp;
        int ret;

        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_AFSFetchStatus(&bp, call, &vp->scb);
        xdr_decode_AFSCallBack(&bp, call, &vp->scb);
        xdr_decode_AFSVolSync(&bp, &op->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 file
 */
void afs_fs_fetch_status(struct afs_operation *op)
{
        struct afs_vnode_param *vp = &op->file[op->fetch_status.which];
        struct afs_call *call;
        __be32 *bp;

        _enter(",%x,{%llx:%llu},,",
               key_serial(op->key), vp->fid.vid, vp->fid.vnode);

        call = afs_alloc_flat_call(op->net, &afs_RXFSFetchStatus,
                                   16, (21 + 3 + 6) * 4);
        if (!call)
                return afs_op_nomem(op);

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

        trace_afs_make_fs_call(call, &vp->fid);
        afs_make_op_call(op, call, GFP_NOFS);
}

/*
 * deliver reply data to an FS.FetchData
 */
static int afs_deliver_fs_fetch_data(struct afs_call *call)
{
        struct afs_operation *op = call->op;
        struct afs_vnode_param *vp = &op->file[0];
        struct afs_read *req = op->fetch.req;
        const __be32 *bp;
        int ret;

        _enter("{%u,%zu,%zu/%llu}",
               call->unmarshall, call->iov_len, iov_iter_count(call->iter),
               req->actual_len);

        switch (call->unmarshall) {
        case 0:
                req->actual_len = 0;
                call->unmarshall++;
                if (call->operation_ID == FSFETCHDATA64) {
                        afs_extract_to_tmp64(call);
                } else {
                        call->tmp_u = htonl(0);
                        afs_extract_to_tmp(call);
                }
                fallthrough;

                /* Extract the returned data length into
                 * ->actual_len.  This may indicate more or less data than was
                 * requested will be returned.
                 */
        case 1:
                _debug("extract data length");
                ret = afs_extract_data(call, true);
                if (ret < 0)
                        return ret;

                req->actual_len = be64_to_cpu(call->tmp64);
                _debug("DATA length: %llu", req->actual_len);

                if (req->actual_len == 0)
                        goto no_more_data;

                call->iter = req->iter;
                call->iov_len = min(req->actual_len, req->len);
                call->unmarshall++;
                fallthrough;

                /* extract the returned data */
        case 2:
                _debug("extract data %zu/%llu",
                       iov_iter_count(call->iter), req->actual_len);

                ret = afs_extract_data(call, true);
                if (ret < 0)
                        return ret;

                call->iter = &call->def_iter;
                if (req->actual_len <= req->len)
                        goto no_more_data;

                /* Discard any excess data the server gave us */
                afs_extract_discard(call, req->actual_len - req->len);
                call->unmarshall = 3;
                fallthrough;

        case 3:
                _debug("extract discard %zu/%llu",
                       iov_iter_count(call->iter), req->actual_len - req->len);

                ret = afs_extract_data(call, true);
                if (ret < 0)
                        return ret;

        no_more_data:
                call->unmarshall = 4;
                afs_extract_to_buf(call, (21 + 3 + 6) * 4);
                fallthrough;

                /* extract the metadata */
        case 4:
                ret = afs_extract_data(call, false);
                if (ret < 0)
                        return ret;

                bp = call->buffer;
                xdr_decode_AFSFetchStatus(&bp, call, &vp->scb);
                xdr_decode_AFSCallBack(&bp, call, &vp->scb);
                xdr_decode_AFSVolSync(&bp, &op->volsync);

                req->data_version = vp->scb.status.data_version;
                req->file_size = vp->scb.status.size;

                call->unmarshall++;
                fallthrough;

        case 5:
                break;
        }

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

/*
 * 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_flat_call_destructor,
};

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

/*
 * fetch data from a very large file
 */
static void afs_fs_fetch_data64(struct afs_operation *op)
{
        struct afs_vnode_param *vp = &op->file[0];
        struct afs_read *req = op->fetch.req;
        struct afs_call *call;
        __be32 *bp;

        _enter("");

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

        /* marshall the parameters */
        bp = call->request;
        bp[0] = htonl(FSFETCHDATA64);
        bp[1] = htonl(vp->fid.vid);
        bp[2] = htonl(vp->fid.vnode);
        bp[3] = htonl(vp->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));

        trace_afs_make_fs_call(call, &vp->fid);
        afs_make_op_call(op, call, GFP_NOFS);
}

/*
 * fetch data from a file
 */
void afs_fs_fetch_data(struct afs_operation *op)
{
        struct afs_vnode_param *vp = &op->file[0];
        struct afs_call *call;
        struct afs_read *req = op->fetch.req;
        __be32 *bp;

        if (test_bit(AFS_SERVER_FL_HAS_FS64, &op->server->flags))
                return afs_fs_fetch_data64(op);

        _enter("");

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

        req->call_debug_id = call->debug_id;

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

        trace_afs_make_fs_call(call, &vp->fid);
        afs_make_op_call(op, call, GFP_NOFS);
}

/*
 * deliver reply data to an FS.CreateFile or an FS.MakeDir
 */
static int afs_deliver_fs_create_vnode(struct afs_call *call)
{
        struct afs_operation *op = call->op;
        struct afs_vnode_param *dvp = &op->file[0];
        struct afs_vnode_param *vp = &op->file[1];
        const __be32 *bp;
        int ret;

        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, &op->file[1].fid);
        xdr_decode_AFSFetchStatus(&bp, call, &vp->scb);
        xdr_decode_AFSFetchStatus(&bp, call, &dvp->scb);
        xdr_decode_AFSCallBack(&bp, call, &vp->scb);
        xdr_decode_AFSVolSync(&bp, &op->volsync);

        _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,
};

/*
 * Create a file.
 */
void afs_fs_create_file(struct afs_operation *op)
{
        const struct qstr *name = &op->dentry->d_name;
        struct afs_vnode_param *dvp = &op->file[0];
        struct afs_call *call;
        size_t namesz, reqsz, padsz;
        __be32 *bp;

        _enter("");

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

        call = afs_alloc_flat_call(op->net, &afs_RXFSCreateFile,
                                   reqsz, (3 + 21 + 21 + 3 + 6) * 4);
        if (!call)
                return afs_op_nomem(op);

        /* marshall the parameters */
        bp = call->request;
        *bp++ = htonl(FSCREATEFILE);
        *bp++ = htonl(dvp->fid.vid);
        *bp++ = htonl(dvp->fid.vnode);
        *bp++ = htonl(dvp->fid.unique);
        *bp++ = htonl(namesz);
        memcpy(bp, name->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(op->mtime.tv_sec); /* mtime */
        *bp++ = 0; /* owner */
        *bp++ = 0; /* group */
        *bp++ = htonl(op->create.mode & S_IALLUGO); /* unix mode */
        *bp++ = 0; /* segment size */

        trace_afs_make_fs_call1(call, &dvp->fid, name);
        afs_make_op_call(op, call, GFP_NOFS);
}

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 new directory
 */
void afs_fs_make_dir(struct afs_operation *op)
{
        const struct qstr *name = &op->dentry->d_name;
        struct afs_vnode_param *dvp = &op->file[0];
        struct afs_call *call;
        size_t namesz, reqsz, padsz;
        __be32 *bp;

        _enter("");

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

        call = afs_alloc_flat_call(op->net, &afs_RXFSMakeDir,
                                   reqsz, (3 + 21 + 21 + 3 + 6) * 4);
        if (!call)
                return afs_op_nomem(op);

        /* marshall the parameters */
        bp = call->request;
        *bp++ = htonl(FSMAKEDIR);
        *bp++ = htonl(dvp->fid.vid);
        *bp++ = htonl(dvp->fid.vnode);
        *bp++ = htonl(dvp->fid.unique);
        *bp++ = htonl(namesz);
        memcpy(bp, name->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(op->mtime.tv_sec); /* mtime */
        *bp++ = 0; /* owner */
        *bp++ = 0; /* group */
        *bp++ = htonl(op->create.mode & S_IALLUGO); /* unix mode */
        *bp++ = 0; /* segment size */

        trace_afs_make_fs_call1(call, &dvp->fid, name);
        afs_make_op_call(op, call, GFP_NOFS);
}

/*
 * Deliver reply data to any operation that returns status and volume sync.
 */
static int afs_deliver_fs_file_status_and_vol(struct afs_call *call)
{
        struct afs_operation *op = call->op;
        struct afs_vnode_param *vp = &op->file[0];
        const __be32 *bp;
        int ret;

        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_AFSFetchStatus(&bp, call, &vp->scb);
        xdr_decode_AFSVolSync(&bp, &op->volsync);

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

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

/*
 * Remove a file.
 */
void afs_fs_remove_file(struct afs_operation *op)
{
        const struct qstr *name = &op->dentry->d_name;
        struct afs_vnode_param *dvp = &op->file[0];
        struct afs_call *call;
        size_t namesz, reqsz, padsz;
        __be32 *bp;

        _enter("");

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

        call = afs_alloc_flat_call(op->net, &afs_RXFSRemoveFile,
                                   reqsz, (21 + 6) * 4);
        if (!call)
                return afs_op_nomem(op);

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

        trace_afs_make_fs_call1(call, &dvp->fid, name);
        afs_make_op_call(op, call, GFP_NOFS);
}

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

/*
 * Remove a directory.
 */
void afs_fs_remove_dir(struct afs_operation *op)
{
        const struct qstr *name = &op->dentry->d_name;
        struct afs_vnode_param *dvp = &op->file[0];
        struct afs_call *call;
        size_t namesz, reqsz, padsz;
        __be32 *bp;

        _enter("");

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

        call = afs_alloc_flat_call(op->net, &afs_RXFSRemoveDir,
                                   reqsz, (21 + 6) * 4);
        if (!call)
                return afs_op_nomem(op);

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

        trace_afs_make_fs_call1(call, &dvp->fid, name);
        afs_make_op_call(op, call, GFP_NOFS);
}

/*
 * deliver reply data to an FS.Link
 */
static int afs_deliver_fs_link(struct afs_call *call)
{
        struct afs_operation *op = call->op;
        struct afs_vnode_param *dvp = &op->file[0];
        struct afs_vnode_param *vp = &op->file[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;
        xdr_decode_AFSFetchStatus(&bp, call, &vp->scb);
        xdr_decode_AFSFetchStatus(&bp, call, &dvp->scb);
        xdr_decode_AFSVolSync(&bp, &op->volsync);

        _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
 */
void afs_fs_link(struct afs_operation *op)
{
        const struct qstr *name = &op->dentry->d_name;
        struct afs_vnode_param *dvp = &op->file[0];
        struct afs_vnode_param *vp = &op->file[1];
        struct afs_call *call;
        size_t namesz, reqsz, padsz;
        __be32 *bp;

        _enter("");

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

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

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

        trace_afs_make_fs_call1(call, &vp->fid, name);
        afs_make_op_call(op, call, GFP_NOFS);
}

/*
 * deliver reply data to an FS.Symlink
 */
static int afs_deliver_fs_symlink(struct afs_call *call)
{
        struct afs_operation *op = call->op;
        struct afs_vnode_param *dvp = &op->file[0];
        struct afs_vnode_param *vp = &op->file[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;
        xdr_decode_AFSFid(&bp, &vp->fid);
        xdr_decode_AFSFetchStatus(&bp, call, &vp->scb);
        xdr_decode_AFSFetchStatus(&bp, call, &dvp->scb);
        xdr_decode_AFSVolSync(&bp, &op->volsync);

        _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
 */
void afs_fs_symlink(struct afs_operation *op)
{
        const struct qstr *name = &op->dentry->d_name;
        struct afs_vnode_param *dvp = &op->file[0];
        struct afs_call *call;
        size_t namesz, reqsz, padsz, c_namesz, c_padsz;
        __be32 *bp;

        _enter("");

        namesz = name->len;
        padsz = (4 - (namesz & 3)) & 3;

        c_namesz = strlen(op->create.symlink);
        c_padsz = (4 - (c_namesz & 3)) & 3;

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

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

        /* marshall the parameters */
        bp = call->request;
        *bp++ = htonl(FSSYMLINK);
        *bp++ = htonl(dvp->fid.vid);
        *bp++ = htonl(dvp->fid.vnode);
        *bp++ = htonl(dvp->fid.unique);
        *bp++ = htonl(namesz);
        memcpy(bp, name->name, namesz);
        bp = (void *) bp + namesz;
        if (padsz > 0) {
                memset(bp, 0, padsz);
                bp = (void *) bp + padsz;
        }
        *bp++ = htonl(c_namesz);
        memcpy(bp, op->create.symlink, 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(op->mtime.tv_sec); /* mtime */
        *bp++ = 0; /* owner */
        *bp++ = 0; /* group */
        *bp++ = htonl(S_IRWXUGO); /* unix mode */
        *bp++ = 0; /* segment size */

        trace_afs_make_fs_call1(call, &dvp->fid, name);
        afs_make_op_call(op, call, GFP_NOFS);
}

/*
 * deliver reply data to an FS.Rename
 */
static int afs_deliver_fs_rename(struct afs_call *call)
{
        struct afs_operation *op = call->op;
        struct afs_vnode_param *orig_dvp = &op->file[0];
        struct afs_vnode_param *new_dvp = &op->file[1];
        const __be32 *bp;
        int ret;

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

        bp = call->buffer;
        /* If the two dirs are the same, we have two copies of the same status
         * report, so we just decode it twice.
         */
        xdr_decode_AFSFetchStatus(&bp, call, &orig_dvp->scb);
        xdr_decode_AFSFetchStatus(&bp, call, &new_dvp->scb);
        xdr_decode_AFSVolSync(&bp, &op->volsync);

        _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,
};

/*
 * Rename/move a file or directory.
 */
void afs_fs_rename(struct afs_operation *op)
{
        struct afs_vnode_param *orig_dvp = &op->file[0];
        struct afs_vnode_param *new_dvp = &op->file[1];
        const struct qstr *orig_name = &op->dentry->d_name;
        const struct qstr *new_name = &op->dentry_2->d_name;
        struct afs_call *call;
        size_t reqsz, o_namesz, o_padsz, n_namesz, n_padsz;
        __be32 *bp;

        _enter("");

        o_namesz = orig_name->len;
        o_padsz = (4 - (o_namesz & 3)) & 3;

        n_namesz = new_name->len;
        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(op->net, &afs_RXFSRename, reqsz, (21 + 21 + 6) * 4);
        if (!call)
                return afs_op_nomem(op);

        /* marshall the parameters */
        bp = call->request;
        *bp++ = htonl(FSRENAME);
        *bp++ = htonl(orig_dvp->fid.vid);
        *bp++ = htonl(orig_dvp->fid.vnode);
        *bp++ = htonl(orig_dvp->fid.unique);
        *bp++ = htonl(o_namesz);
        memcpy(bp, orig_name->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_dvp->fid.vid);
        *bp++ = htonl(new_dvp->fid.vnode);
        *bp++ = htonl(new_dvp->fid.unique);
        *bp++ = htonl(n_namesz);
        memcpy(bp, new_name->name, n_namesz);
        bp = (void *) bp + n_namesz;

        if (n_padsz > 0) {
                memset(bp, 0, n_padsz);
                bp = (void *) bp + n_padsz;
        }

        trace_afs_make_fs_call2(call, &orig_dvp->fid, orig_name, new_name);
        afs_make_op_call(op, call, GFP_NOFS);
}

/*
 * Deliver reply data to FS.StoreData or FS.StoreStatus
 */
static int afs_deliver_fs_store_data(struct afs_call *call)
{
        struct afs_operation *op = call->op;
        struct afs_vnode_param *vp = &op->file[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;
        xdr_decode_AFSFetchStatus(&bp, call, &vp->scb);
        xdr_decode_AFSVolSync(&bp, &op->volsync);

        _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 void afs_fs_store_data64(struct afs_operation *op)
{
        struct afs_vnode_param *vp = &op->file[0];
        struct afs_call *call;
        __be32 *bp;

        _enter(",%x,{%llx:%llu},,",
               key_serial(op->key), vp->fid.vid, vp->fid.vnode);

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

        call->write_iter = op->store.write_iter;

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

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

        *bp++ = htonl(upper_32_bits(op->store.pos));
        *bp++ = htonl(lower_32_bits(op->store.pos));
        *bp++ = htonl(upper_32_bits(op->store.size));
        *bp++ = htonl(lower_32_bits(op->store.size));
        *bp++ = htonl(upper_32_bits(op->store.i_size));
        *bp++ = htonl(lower_32_bits(op->store.i_size));

        trace_afs_make_fs_call(call, &vp->fid);
        afs_make_op_call(op, call, GFP_NOFS);
}

/*
 * Write data to a file on the server.
 */
void afs_fs_store_data(struct afs_operation *op)
{
        struct afs_vnode_param *vp = &op->file[0];
        struct afs_call *call;
        __be32 *bp;

        _enter(",%x,{%llx:%llu},,",
               key_serial(op->key), vp->fid.vid, vp->fid.vnode);

        _debug("size %llx, at %llx, i_size %llx",
               (unsigned long long)op->store.size,
               (unsigned long long)op->store.pos,
               (unsigned long long)op->store.i_size);

        if (test_bit(AFS_SERVER_FL_HAS_FS64, &op->server->flags))
                return afs_fs_store_data64(op);

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

        call->write_iter = op->store.write_iter;

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

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

        *bp++ = htonl(lower_32_bits(op->store.pos));
        *bp++ = htonl(lower_32_bits(op->store.size));
        *bp++ = htonl(lower_32_bits(op->store.i_size));

        trace_afs_make_fs_call(call, &vp->fid);
        afs_make_op_call(op, call, GFP_NOFS);
}

/*
 * FS.StoreStatus operation type
 */
static const struct afs_call_type afs_RXFSStoreStatus = {
        .name           = "FS.StoreStatus",
        .op             = afs_FS_StoreStatus,
        .deliver        = afs_deliver_fs_store_data,
        .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_data,
        .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_data,
        .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 void afs_fs_setattr_size64(struct afs_operation *op)
{
        struct afs_vnode_param *vp = &op->file[0];
        struct afs_call *call;
        struct iattr *attr = op->setattr.attr;
        __be32 *bp;

        _enter(",%x,{%llx:%llu},,",
               key_serial(op->key), vp->fid.vid, vp->fid.vnode);

        ASSERT(attr->ia_valid & ATTR_SIZE);

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

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

        xdr_encode_AFS_StoreStatus(&bp, attr);

        *bp++ = htonl(upper_32_bits(attr->ia_size));    /* position of start of write */
        *bp++ = htonl(lower_32_bits(attr->ia_size));
        *bp++ = 0;                                      /* size of write */
        *bp++ = 0;
        *bp++ = htonl(upper_32_bits(attr->ia_size));    /* new file length */
        *bp++ = htonl(lower_32_bits(attr->ia_size));

        trace_afs_make_fs_call(call, &vp->fid);
        afs_make_op_call(op, call, GFP_NOFS);
}

/*
 * set the attributes on a file, using FS.StoreData rather than FS.StoreStatus
 * so as to alter the file size also
 */
static void afs_fs_setattr_size(struct afs_operation *op)
{
        struct afs_vnode_param *vp = &op->file[0];
        struct afs_call *call;
        struct iattr *attr = op->setattr.attr;
        __be32 *bp;

        _enter(",%x,{%llx:%llu},,",
               key_serial(op->key), vp->fid.vid, vp->fid.vnode);

        ASSERT(attr->ia_valid & ATTR_SIZE);
        if (test_bit(AFS_SERVER_FL_HAS_FS64, &op->server->flags))
                return afs_fs_setattr_size64(op);

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

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

        xdr_encode_AFS_StoreStatus(&bp, attr);

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

        trace_afs_make_fs_call(call, &vp->fid);
        afs_make_op_call(op, call, GFP_NOFS);
}

/*
 * set the attributes on a file, using FS.StoreData if there's a change in file
 * size, and FS.StoreStatus otherwise
 */
void afs_fs_setattr(struct afs_operation *op)
{
        struct afs_vnode_param *vp = &op->file[0];
        struct afs_call *call;
        struct iattr *attr = op->setattr.attr;
        __be32 *bp;

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

        _enter(",%x,{%llx:%llu},,",
               key_serial(op->key), vp->fid.vid, vp->fid.vnode);

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

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

        xdr_encode_AFS_StoreStatus(&bp, op->setattr.attr);

        trace_afs_make_fs_call(call, &vp->fid);
        afs_make_op_call(op, call, GFP_NOFS);
}

/*
 * deliver reply data to an FS.GetVolumeStatus
 */
static int afs_deliver_fs_get_volume_status(struct afs_call *call)
{
        struct afs_operation *op = call->op;
        const __be32 *bp;
        char *p;
        u32 size;
        int ret;

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

        switch (call->unmarshall) {
        case 0:
                call->unmarshall++;
                afs_extract_to_buf(call, 12 * 4);
                fallthrough;

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

                bp = call->buffer;
                xdr_decode_AFSFetchVolumeStatus(&bp, &op->volstatus.vs);
                call->unmarshall++;
                afs_extract_to_tmp(call);
                fallthrough;

                /* extract the volume name length */
        case 2:
                ret = afs_extract_data(call, 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, afs_eproto_volname_len);
                size = (call->count + 3) & ~3; /* It's padded */
                afs_extract_to_buf(call, size);
                call->unmarshall++;
                fallthrough;

                /* extract the volume name */
        case 3:
                _debug("extract volname");
                ret = afs_extract_data(call, true);
                if (ret < 0)
                        return ret;

                p = call->buffer;
                p[call->count] = 0;
                _debug("volname '%s'", p);
                afs_extract_to_tmp(call);
                call->unmarshall++;
                fallthrough;

                /* extract the offline message length */
        case 4:
                ret = afs_extract_data(call, 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, afs_eproto_offline_msg_len);
                size = (call->count + 3) & ~3; /* It's padded */
                afs_extract_to_buf(call, size);
                call->unmarshall++;
                fallthrough;

                /* extract the offline message */
        case 5:
                _debug("extract offline");
                ret = afs_extract_data(call, true);
                if (ret < 0)
                        return ret;

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

                afs_extract_to_tmp(call);
                call->unmarshall++;
                fallthrough;

                /* extract the message of the day length */
        case 6:
                ret = afs_extract_data(call, 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, afs_eproto_motd_len);
                size = (call->count + 3) & ~3; /* It's padded */
                afs_extract_to_buf(call, size);
                call->unmarshall++;
                fallthrough;

                /* extract the message of the day */
        case 7:
                _debug("extract motd");
                ret = afs_extract_data(call, false);
                if (ret < 0)
                        return ret;

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

                call->unmarshall++;
                fallthrough;

        case 8:
                break;
        }

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

/*
 * 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_flat_call_destructor,
};

/*
 * fetch the status of a volume
 */
void afs_fs_get_volume_status(struct afs_operation *op)
{
        struct afs_vnode_param *vp = &op->file[0];
        struct afs_call *call;
        __be32 *bp;

        _enter("");

        call = afs_alloc_flat_call(op->net, &afs_RXFSGetVolumeStatus, 2 * 4,
                                   max(12 * 4, AFSOPAQUEMAX + 1));
        if (!call)
                return afs_op_nomem(op);

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

        trace_afs_make_fs_call(call, &vp->fid);
        afs_make_op_call(op, call, GFP_NOFS);
}

/*
 * deliver reply data to an FS.SetLock, FS.ExtendLock or FS.ReleaseLock
 */
static int afs_deliver_fs_xxxx_lock(struct afs_call *call)
{
        struct afs_operation *op = call->op;
        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, &op->volsync);

        _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,
        .done           = afs_lock_op_done,
        .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,
        .done           = afs_lock_op_done,
        .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
 */
void afs_fs_set_lock(struct afs_operation *op)
{
        struct afs_vnode_param *vp = &op->file[0];
        struct afs_call *call;
        __be32 *bp;

        _enter("");

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

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

        trace_afs_make_fs_calli(call, &vp->fid, op->lock.type);
        afs_make_op_call(op, call, GFP_NOFS);
}

/*
 * extend a lock on a file
 */
void afs_fs_extend_lock(struct afs_operation *op)
{
        struct afs_vnode_param *vp = &op->file[0];
        struct afs_call *call;
        __be32 *bp;

        _enter("");

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

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

        trace_afs_make_fs_call(call, &vp->fid);
        afs_make_op_call(op, call, GFP_NOFS);
}

/*
 * release a lock on a file
 */
void afs_fs_release_lock(struct afs_operation *op)
{
        struct afs_vnode_param *vp = &op->file[0];
        struct afs_call *call;
        __be32 *bp;

        _enter("");

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

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

        trace_afs_make_fs_call(call, &vp->fid);
        afs_make_op_call(op, call, GFP_NOFS);
}

/*
 * 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);

        call->server = afs_use_server(server, afs_server_trace_give_up_cb);
        afs_make_call(ac, call, GFP_NOFS);
        return afs_wait_for_call_to_complete(call, ac);
}

/*
 * 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}", call->unmarshall, iov_iter_count(call->iter));

        switch (call->unmarshall) {
        case 0:
                afs_extract_to_tmp(call);
                call->unmarshall++;
                fallthrough;

                /* Extract the capabilities word count */
        case 1:
                ret = afs_extract_data(call, true);
                if (ret < 0)
                        return ret;

                count = ntohl(call->tmp);
                call->count = count;
                call->count2 = count;
                if (count == 0) {
                        call->unmarshall = 4;
                        call->tmp = 0;
                        break;
                }

                /* Extract the first word of the capabilities to call->tmp */
                afs_extract_to_tmp(call);
                call->unmarshall++;
                fallthrough;

        case 2:
                ret = afs_extract_data(call, false);
                if (ret < 0)
                        return ret;

                afs_extract_discard(call, (count - 1) * sizeof(__be32));
                call->unmarshall++;
                fallthrough;

                /* Extract remaining capabilities words */
        case 3:
                ret = afs_extract_data(call, false);
                if (ret < 0)
                        return ret;

                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,
        .done           = afs_fileserver_probe_result,
        .destructor     = afs_flat_call_destructor,
};

/*
 * Probe a fileserver for the capabilities that it supports.  This RPC can
 * reply with up to 196 words.  The operation is asynchronous and if we managed
 * to allocate a call, true is returned the result is delivered through the
 * ->done() - otherwise we return false to indicate we didn't even try.
 */
bool 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 false;

        call->key = key;
        call->server = afs_use_server(server, afs_server_trace_get_caps);
        call->upgrade = true;
        call->async = true;
        call->max_lifespan = AFS_PROBE_MAX_LIFESPAN;

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

        trace_afs_make_fs_call(call, NULL);
        afs_make_call(ac, call, GFP_NOFS);
        afs_put_call(call);
        return true;
}

/*
 * Deliver reply data to an FS.InlineBulkStatus call
 */
static int afs_deliver_fs_inline_bulk_status(struct afs_call *call)
{
        struct afs_operation *op = call->op;
        struct afs_status_cb *scb;
        const __be32 *bp;
        u32 tmp;
        int ret;

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

        switch (call->unmarshall) {
        case 0:
                afs_extract_to_tmp(call);
                call->unmarshall++;
                fallthrough;

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

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

                call->count = 0;
                call->unmarshall++;
        more_counts:
                afs_extract_to_buf(call, 21 * sizeof(__be32));
                fallthrough;

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

                switch (call->count) {
                case 0:
                        scb = &op->file[0].scb;
                        break;
                case 1:
                        scb = &op->file[1].scb;
                        break;
                default:
                        scb = &op->more_files[call->count - 2].scb;
                        break;
                }

                bp = call->buffer;
                xdr_decode_AFSFetchStatus(&bp, call, scb);

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

                call->count = 0;
                call->unmarshall++;
                afs_extract_to_tmp(call);
                fallthrough;

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

                tmp = ntohl(call->tmp);
                _debug("CB count: %u", tmp);
                if (tmp != op->nr_files)
                        return afs_protocol_error(call, afs_eproto_ibulkst_cb_count);
                call->count = 0;
                call->unmarshall++;
        more_cbs:
                afs_extract_to_buf(call, 3 * sizeof(__be32));
                fallthrough;

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

                _debug("unmarshall CB array");
                switch (call->count) {
                case 0:
                        scb = &op->file[0].scb;
                        break;
                case 1:
                        scb = &op->file[1].scb;
                        break;
                default:
                        scb = &op->more_files[call->count - 2].scb;
                        break;
                }

                bp = call->buffer;
                xdr_decode_AFSCallBack(&bp, call, scb);
                call->count++;
                if (call->count < op->nr_files)
                        goto more_cbs;

                afs_extract_to_buf(call, 6 * sizeof(__be32));
                call->unmarshall++;
                fallthrough;

        case 5:
                ret = afs_extract_data(call, false);
                if (ret < 0)
                        return ret;

                bp = call->buffer;
                xdr_decode_AFSVolSync(&bp, &op->volsync);

                call->unmarshall++;
                fallthrough;

        case 6:
                break;
        }

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

static void afs_done_fs_inline_bulk_status(struct afs_call *call)
{
        if (call->error == -ECONNABORTED &&
            call->abort_code == RX_INVALID_OPERATION) {
                set_bit(AFS_SERVER_FL_NO_IBULK, &call->server->flags);
                if (call->op)
                        set_bit(AFS_VOLUME_MAYBE_NO_IBULK, &call->op->volume->flags);
        }
}

/*
 * 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,
        .done           = afs_done_fs_inline_bulk_status,
        .destructor     = afs_flat_call_destructor,
};

/*
 * Fetch the status information for up to 50 files
 */
void afs_fs_inline_bulk_status(struct afs_operation *op)
{
        struct afs_vnode_param *dvp = &op->file[0];
        struct afs_vnode_param *vp = &op->file[1];
        struct afs_call *call;
        __be32 *bp;
        int i;

        if (test_bit(AFS_SERVER_FL_NO_IBULK, &op->server->flags)) {
                op->error = -ENOTSUPP;
                return;
        }

        _enter(",%x,{%llx:%llu},%u",
               key_serial(op->key), vp->fid.vid, vp->fid.vnode, op->nr_files);

        call = afs_alloc_flat_call(op->net, &afs_RXFSInlineBulkStatus,
                                   (2 + op->nr_files * 3) * 4,
                                   21 * 4);
        if (!call)
                return afs_op_nomem(op);

        /* marshall the parameters */
        bp = call->request;
        *bp++ = htonl(FSINLINEBULKSTATUS);
        *bp++ = htonl(op->nr_files);
        *bp++ = htonl(dvp->fid.vid);
        *bp++ = htonl(dvp->fid.vnode);
        *bp++ = htonl(dvp->fid.unique);
        *bp++ = htonl(vp->fid.vid);
        *bp++ = htonl(vp->fid.vnode);
        *bp++ = htonl(vp->fid.unique);
        for (i = 0; i < op->nr_files - 2; i++) {
                *bp++ = htonl(op->more_files[i].fid.vid);
                *bp++ = htonl(op->more_files[i].fid.vnode);
                *bp++ = htonl(op->more_files[i].fid.unique);
        }

        trace_afs_make_fs_call(call, &vp->fid);
        afs_make_op_call(op, call, GFP_NOFS);
}

/*
 * deliver reply data to an FS.FetchACL
 */
static int afs_deliver_fs_fetch_acl(struct afs_call *call)
{
        struct afs_operation *op = call->op;
        struct afs_vnode_param *vp = &op->file[0];
        struct afs_acl *acl;
        const __be32 *bp;
        unsigned int size;
        int ret;

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

        switch (call->unmarshall) {
        case 0:
                afs_extract_to_tmp(call);
                call->unmarshall++;
                fallthrough;

                /* extract the returned data length */
        case 1:
                ret = afs_extract_data(call, true);
                if (ret < 0)
                        return ret;

                size = call->count2 = ntohl(call->tmp);
                size = round_up(size, 4);

                acl = kmalloc(struct_size(acl, data, size), GFP_KERNEL);
                if (!acl)
                        return -ENOMEM;
                op->acl = acl;
                acl->size = call->count2;
                afs_extract_begin(call, acl->data, size);
                call->unmarshall++;
                fallthrough;

                /* extract the returned data */
        case 2:
                ret = afs_extract_data(call, true);
                if (ret < 0)
                        return ret;

                afs_extract_to_buf(call, (21 + 6) * 4);
                call->unmarshall++;
                fallthrough;

                /* extract the metadata */
        case 3:
                ret = afs_extract_data(call, false);
                if (ret < 0)
                        return ret;

                bp = call->buffer;
                xdr_decode_AFSFetchStatus(&bp, call, &vp->scb);
                xdr_decode_AFSVolSync(&bp, &op->volsync);

                call->unmarshall++;
                fallthrough;

        case 4:
                break;
        }

        _leave(" = 0 [done]");

        return 0;
}

/*
 * FS.FetchACL operation type
 */
static const struct afs_call_type afs_RXFSFetchACL = {
        .name           = "FS.FetchACL",
        .op             = afs_FS_FetchACL,
        .deliver        = afs_deliver_fs_fetch_acl,
};

/*
 * Fetch the ACL for a file.
 */
void afs_fs_fetch_acl(struct afs_operation *op)
{
        struct afs_vnode_param *vp = &op->file[0];
        struct afs_call *call;
        __be32 *bp;

        _enter(",%x,{%llx:%llu},,",
               key_serial(op->key), vp->fid.vid, vp->fid.vnode);

        call = afs_alloc_flat_call(op->net, &afs_RXFSFetchACL, 16, (21 + 6) * 4);
        if (!call)
                return afs_op_nomem(op);

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

        trace_afs_make_fs_call(call, &vp->fid);
        afs_make_op_call(op, call, GFP_KERNEL);
}

/*
 * FS.StoreACL operation type
 */
static const struct afs_call_type afs_RXFSStoreACL = {
        .name           = "FS.StoreACL",
        .op             = afs_FS_StoreACL,
        .deliver        = afs_deliver_fs_file_status_and_vol,
        .destructor     = afs_flat_call_destructor,
};

/*
 * Fetch the ACL for a file.
 */
void afs_fs_store_acl(struct afs_operation *op)
{
        struct afs_vnode_param *vp = &op->file[0];
        struct afs_call *call;
        const struct afs_acl *acl = op->acl;
        size_t size;
        __be32 *bp;

        _enter(",%x,{%llx:%llu},,",
               key_serial(op->key), vp->fid.vid, vp->fid.vnode);

        size = round_up(acl->size, 4);
        call = afs_alloc_flat_call(op->net, &afs_RXFSStoreACL,
                                   5 * 4 + size, (21 + 6) * 4);
        if (!call)
                return afs_op_nomem(op);

        /* marshall the parameters */
        bp = call->request;
        bp[0] = htonl(FSSTOREACL);
        bp[1] = htonl(vp->fid.vid);
        bp[2] = htonl(vp->fid.vnode);
        bp[3] = htonl(vp->fid.unique);
        bp[4] = htonl(acl->size);
        memcpy(&bp[5], acl->data, acl->size);
        if (acl->size != size)
                memset((void *)&bp[5] + acl->size, 0, size - acl->size);

        trace_afs_make_fs_call(call, &vp->fid);
        afs_make_op_call(op, call, GFP_KERNEL);
}