// SPDX-License-Identifier: GPL-2.0-or-later
/* YFS File Server client stubs
 *
 * Copyright (C) 2018 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 "internal.h"
#include "afs_fs.h"
#include "xdr_fs.h"
#include "protocol_yfs.h"

#define xdr_size(x) (sizeof(*x) / sizeof(__be32))

static void xdr_decode_YFSFid(const __be32 **_bp, struct afs_fid *fid)
{
        const struct yfs_xdr_YFSFid *x = (const void *)*_bp;

        fid->vid        = xdr_to_u64(x->volume);
        fid->vnode      = xdr_to_u64(x->vnode.lo);
        fid->vnode_hi   = ntohl(x->vnode.hi);
        fid->unique     = ntohl(x->vnode.unique);
        *_bp += xdr_size(x);
}

static __be32 *xdr_encode_u32(__be32 *bp, u32 n)
{
        *bp++ = htonl(n);
        return bp;
}

static __be32 *xdr_encode_u64(__be32 *bp, u64 n)
{
        struct yfs_xdr_u64 *x = (void *)bp;

        *x = u64_to_xdr(n);
        return bp + xdr_size(x);
}

static __be32 *xdr_encode_YFSFid(__be32 *bp, struct afs_fid *fid)
{
        struct yfs_xdr_YFSFid *x = (void *)bp;

        x->volume       = u64_to_xdr(fid->vid);
        x->vnode.lo     = u64_to_xdr(fid->vnode);
        x->vnode.hi     = htonl(fid->vnode_hi);
        x->vnode.unique = htonl(fid->unique);
        return bp + xdr_size(x);
}

static size_t xdr_strlen(unsigned int len)
{
        return sizeof(__be32) + round_up(len, sizeof(__be32));
}

static __be32 *xdr_encode_string(__be32 *bp, const char *p, unsigned int len)
{
        bp = xdr_encode_u32(bp, len);
        bp = memcpy(bp, p, len);
        if (len & 3) {
                unsigned int pad = 4 - (len & 3);

                memset((u8 *)bp + len, 0, pad);
                len += pad;
        }

        return bp + len / sizeof(__be32);
}

static __be32 *xdr_encode_name(__be32 *bp, const struct qstr *p)
{
        return xdr_encode_string(bp, p->name, p->len);
}

static s64 linux_to_yfs_time(const struct timespec64 *t)
{
        /* Convert to 100ns intervals. */
        return (u64)t->tv_sec * 10000000 + t->tv_nsec/100;
}

static __be32 *xdr_encode_YFSStoreStatus_mode(__be32 *bp, mode_t mode)
{
        struct yfs_xdr_YFSStoreStatus *x = (void *)bp;

        x->mask         = htonl(AFS_SET_MODE);
        x->mode         = htonl(mode & S_IALLUGO);
        x->mtime_client = u64_to_xdr(0);
        x->owner        = u64_to_xdr(0);
        x->group        = u64_to_xdr(0);
        return bp + xdr_size(x);
}

static __be32 *xdr_encode_YFSStoreStatus_mtime(__be32 *bp, const struct timespec64 *t)
{
        struct yfs_xdr_YFSStoreStatus *x = (void *)bp;
        s64 mtime = linux_to_yfs_time(t);

        x->mask         = htonl(AFS_SET_MTIME);
        x->mode         = htonl(0);
        x->mtime_client = u64_to_xdr(mtime);
        x->owner        = u64_to_xdr(0);
        x->group        = u64_to_xdr(0);
        return bp + xdr_size(x);
}

/*
 * Convert a signed 100ns-resolution 64-bit time into a timespec.
 */
static struct timespec64 yfs_time_to_linux(s64 t)
{
        struct timespec64 ts;
        u64 abs_t;

        /*
         * Unfortunately can not use normal 64 bit division on 32 bit arch, but
         * the alternative, do_div, does not work with negative numbers so have
         * to special case them
         */
        if (t < 0) {
                abs_t = -t;
                ts.tv_nsec = (time64_t)(do_div(abs_t, 10000000) * 100);
                ts.tv_nsec = -ts.tv_nsec;
                ts.tv_sec = -abs_t;
        } else {
                abs_t = t;
                ts.tv_nsec = (time64_t)do_div(abs_t, 10000000) * 100;
                ts.tv_sec = abs_t;
        }

        return ts;
}

static struct timespec64 xdr_to_time(const struct yfs_xdr_u64 xdr)
{
        s64 t = xdr_to_u64(xdr);

        return yfs_time_to_linux(t);
}

static void yfs_check_req(struct afs_call *call, __be32 *bp)
{
        size_t len = (void *)bp - call->request;

        if (len > call->request_size)
                pr_err("kAFS: %s: Request buffer overflow (%zu>%u)\n",
                       call->type->name, len, call->request_size);
        else if (len < call->request_size)
                pr_warn("kAFS: %s: Request buffer underflow (%zu<%u)\n",
                        call->type->name, len, call->request_size);
}

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

        pr_notice("YFS XDR: Bad status record\n");
        for (i = 0; i < 6 * 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, 8);
        pr_notice("0x60: %08x %08x\n", ntohl(x[0]), ntohl(x[1]));
}

/*
 * Decode a YFSFetchStatus block
 */
static void xdr_decode_YFSFetchStatus(const __be32 **_bp,
                                      struct afs_call *call,
                                      struct afs_status_cb *scb)
{
        const struct yfs_xdr_YFSFetchStatus *xdr = (const void *)*_bp;
        struct afs_file_status *status = &scb->status;
        u32 type;

        status->abort_code = ntohl(xdr->abort_code);
        if (status->abort_code != 0) {
                if (status->abort_code == VNOVNODE)
                        status->nlink = 0;
                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          = xdr_to_u64(xdr->author);
        status->owner           = xdr_to_u64(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           = xdr_to_u64(xdr->group);
        status->lock_count      = ntohl(xdr->lock_count);

        status->mtime_client    = xdr_to_time(xdr->mtime_client);
        status->mtime_server    = xdr_to_time(xdr->mtime_server);
        status->size            = xdr_to_u64(xdr->size);
        status->data_version    = xdr_to_u64(xdr->data_version);
        scb->have_status        = true;
advance:
        *_bp += xdr_size(xdr);
        return;

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

/*
 * Decode a YFSCallBack block
 */
static void xdr_decode_YFSCallBack(const __be32 **_bp,
                                   struct afs_call *call,
                                   struct afs_status_cb *scb)
{
        struct yfs_xdr_YFSCallBack *x = (void *)*_bp;
        struct afs_callback *cb = &scb->callback;
        ktime_t cb_expiry;

        cb_expiry = call->reply_time;
        cb_expiry = ktime_add(cb_expiry, xdr_to_u64(x->expiration_time) * 100);
        cb->expires_at  = ktime_divns(cb_expiry, NSEC_PER_SEC);
        scb->have_cb    = true;
        *_bp += xdr_size(x);
}

/*
 * Decode a YFSVolSync block
 */
static void xdr_decode_YFSVolSync(const __be32 **_bp,
                                  struct afs_volsync *volsync)
{
        struct yfs_xdr_YFSVolSync *x = (void *)*_bp;
        u64 creation;

        if (volsync) {
                creation = xdr_to_u64(x->vol_creation_date);
                do_div(creation, 10 * 1000 * 1000);
                volsync->creation = creation;
        }

        *_bp += xdr_size(x);
}

/*
 * Encode the requested attributes into a YFSStoreStatus block
 */
static __be32 *xdr_encode_YFS_StoreStatus(__be32 *bp, struct iattr *attr)
{
        struct yfs_xdr_YFSStoreStatus *x = (void *)bp;
        s64 mtime = 0, owner = 0, group = 0;
        u32 mask = 0, mode = 0;

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

        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;
        }

        x->mask         = htonl(mask);
        x->mode         = htonl(mode);
        x->mtime_client = u64_to_xdr(mtime);
        x->owner        = u64_to_xdr(owner);
        x->group        = u64_to_xdr(group);
        return bp + xdr_size(x);
}

/*
 * Decode a YFSFetchVolumeStatus block.
 */
static void xdr_decode_YFSFetchVolumeStatus(const __be32 **_bp,
                                            struct afs_volume_status *vs)
{
        const struct yfs_xdr_YFSFetchVolumeStatus *x = (const void *)*_bp;
        u32 flags;

        vs->vid                 = xdr_to_u64(x->vid);
        vs->parent_id           = xdr_to_u64(x->parent_id);
        flags                   = ntohl(x->flags);
        vs->online              = flags & yfs_FVSOnline;
        vs->in_service          = flags & yfs_FVSInservice;
        vs->blessed             = flags & yfs_FVSBlessed;
        vs->needs_salvage       = flags & yfs_FVSNeedsSalvage;
        vs->type                = ntohl(x->type);
        vs->min_quota           = 0;
        vs->max_quota           = xdr_to_u64(x->max_quota);
        vs->blocks_in_use       = xdr_to_u64(x->blocks_in_use);
        vs->part_blocks_avail   = xdr_to_u64(x->part_blocks_avail);
        vs->part_max_blocks     = xdr_to_u64(x->part_max_blocks);
        vs->vol_copy_date       = xdr_to_u64(x->vol_copy_date);
        vs->vol_backup_date     = xdr_to_u64(x->vol_backup_date);
        *_bp += sizeof(*x) / sizeof(__be32);
}

/*
 * Deliver reply data to operations that just return a file status and a volume
 * sync record.
 */
static int yfs_deliver_status_and_volsync(struct afs_call *call)
{
        struct afs_operation *op = call->op;
        const __be32 *bp;
        int ret;

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

        bp = call->buffer;
        xdr_decode_YFSFetchStatus(&bp, call, &op->file[0].scb);
        xdr_decode_YFSVolSync(&bp, &op->volsync);

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

/*
 * Deliver reply data to an YFS.FetchData64.
 */
static int yfs_deliver_fs_fetch_data64(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;
                afs_extract_to_tmp64(call);
                call->unmarshall++;
                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,
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSCallBack) +
                                   sizeof(struct yfs_xdr_YFSVolSync));
                fallthrough;

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

                bp = call->buffer;
                xdr_decode_YFSFetchStatus(&bp, call, &vp->scb);
                xdr_decode_YFSCallBack(&bp, call, &vp->scb);
                xdr_decode_YFSVolSync(&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;
}

/*
 * YFS.FetchData64 operation type
 */
static const struct afs_call_type yfs_RXYFSFetchData64 = {
        .name           = "YFS.FetchData64",
        .op             = yfs_FS_FetchData64,
        .deliver        = yfs_deliver_fs_fetch_data64,
        .destructor     = afs_flat_call_destructor,
};

/*
 * Fetch data from a file.
 */
void yfs_fs_fetch_data(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(",%x,{%llx:%llu},%llx,%llx",
               key_serial(op->key), vp->fid.vid, vp->fid.vnode,
               req->pos, req->len);

        call = afs_alloc_flat_call(op->net, &yfs_RXYFSFetchData64,
                                   sizeof(__be32) * 2 +
                                   sizeof(struct yfs_xdr_YFSFid) +
                                   sizeof(struct yfs_xdr_u64) * 2,
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSCallBack) +
                                   sizeof(struct yfs_xdr_YFSVolSync));
        if (!call)
                return afs_op_nomem(op);

        req->call_debug_id = call->debug_id;

        /* marshall the parameters */
        bp = call->request;
        bp = xdr_encode_u32(bp, YFSFETCHDATA64);
        bp = xdr_encode_u32(bp, 0); /* RPC flags */
        bp = xdr_encode_YFSFid(bp, &vp->fid);
        bp = xdr_encode_u64(bp, req->pos);
        bp = xdr_encode_u64(bp, req->len);
        yfs_check_req(call, bp);

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

/*
 * Deliver reply data for YFS.CreateFile or YFS.MakeDir.
 */
static int yfs_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;

        _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_YFSFid(&bp, &op->file[1].fid);
        xdr_decode_YFSFetchStatus(&bp, call, &vp->scb);
        xdr_decode_YFSFetchStatus(&bp, call, &dvp->scb);
        xdr_decode_YFSCallBack(&bp, call, &vp->scb);
        xdr_decode_YFSVolSync(&bp, &op->volsync);

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

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

/*
 * Create a file.
 */
void yfs_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 reqsz, rplsz;
        __be32 *bp;

        _enter("");

        reqsz = (sizeof(__be32) +
                 sizeof(__be32) +
                 sizeof(struct yfs_xdr_YFSFid) +
                 xdr_strlen(name->len) +
                 sizeof(struct yfs_xdr_YFSStoreStatus) +
                 sizeof(__be32));
        rplsz = (sizeof(struct yfs_xdr_YFSFid) +
                 sizeof(struct yfs_xdr_YFSFetchStatus) +
                 sizeof(struct yfs_xdr_YFSFetchStatus) +
                 sizeof(struct yfs_xdr_YFSCallBack) +
                 sizeof(struct yfs_xdr_YFSVolSync));

        call = afs_alloc_flat_call(op->net, &afs_RXFSCreateFile, reqsz, rplsz);
        if (!call)
                return afs_op_nomem(op);

        /* marshall the parameters */
        bp = call->request;
        bp = xdr_encode_u32(bp, YFSCREATEFILE);
        bp = xdr_encode_u32(bp, 0); /* RPC flags */
        bp = xdr_encode_YFSFid(bp, &dvp->fid);
        bp = xdr_encode_name(bp, name);
        bp = xdr_encode_YFSStoreStatus_mode(bp, op->create.mode);
        bp = xdr_encode_u32(bp, yfs_LockNone); /* ViceLockType */
        yfs_check_req(call, bp);

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

static const struct afs_call_type yfs_RXFSMakeDir = {
        .name           = "YFS.MakeDir",
        .op             = yfs_FS_MakeDir,
        .deliver        = yfs_deliver_fs_create_vnode,
        .destructor     = afs_flat_call_destructor,
};

/*
 * Make a directory.
 */
void yfs_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 reqsz, rplsz;
        __be32 *bp;

        _enter("");

        reqsz = (sizeof(__be32) +
                 sizeof(struct yfs_xdr_RPCFlags) +
                 sizeof(struct yfs_xdr_YFSFid) +
                 xdr_strlen(name->len) +
                 sizeof(struct yfs_xdr_YFSStoreStatus));
        rplsz = (sizeof(struct yfs_xdr_YFSFid) +
                 sizeof(struct yfs_xdr_YFSFetchStatus) +
                 sizeof(struct yfs_xdr_YFSFetchStatus) +
                 sizeof(struct yfs_xdr_YFSCallBack) +
                 sizeof(struct yfs_xdr_YFSVolSync));

        call = afs_alloc_flat_call(op->net, &yfs_RXFSMakeDir, reqsz, rplsz);
        if (!call)
                return afs_op_nomem(op);

        /* marshall the parameters */
        bp = call->request;
        bp = xdr_encode_u32(bp, YFSMAKEDIR);
        bp = xdr_encode_u32(bp, 0); /* RPC flags */
        bp = xdr_encode_YFSFid(bp, &dvp->fid);
        bp = xdr_encode_name(bp, name);
        bp = xdr_encode_YFSStoreStatus_mode(bp, op->create.mode);
        yfs_check_req(call, bp);

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

/*
 * Deliver reply data to a YFS.RemoveFile2 operation.
 */
static int yfs_deliver_fs_remove_file2(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];
        struct afs_fid fid;
        const __be32 *bp;
        int ret;

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

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

        bp = call->buffer;
        xdr_decode_YFSFetchStatus(&bp, call, &dvp->scb);
        xdr_decode_YFSFid(&bp, &fid);
        xdr_decode_YFSFetchStatus(&bp, call, &vp->scb);
        /* Was deleted if vnode->status.abort_code == VNOVNODE. */

        xdr_decode_YFSVolSync(&bp, &op->volsync);
        return 0;
}

static void yfs_done_fs_remove_file2(struct afs_call *call)
{
        if (call->error == -ECONNABORTED &&
            call->abort_code == RX_INVALID_OPERATION) {
                set_bit(AFS_SERVER_FL_NO_RM2, &call->server->flags);
                call->op->flags |= AFS_OPERATION_DOWNGRADE;
        }
}

/*
 * YFS.RemoveFile2 operation type.
 */
static const struct afs_call_type yfs_RXYFSRemoveFile2 = {
        .name           = "YFS.RemoveFile2",
        .op             = yfs_FS_RemoveFile2,
        .deliver        = yfs_deliver_fs_remove_file2,
        .done           = yfs_done_fs_remove_file2,
        .destructor     = afs_flat_call_destructor,
};

/*
 * Remove a file and retrieve new file status.
 */
void yfs_fs_remove_file2(struct afs_operation *op)
{
        struct afs_vnode_param *dvp = &op->file[0];
        const struct qstr *name = &op->dentry->d_name;
        struct afs_call *call;
        __be32 *bp;

        _enter("");

        call = afs_alloc_flat_call(op->net, &yfs_RXYFSRemoveFile2,
                                   sizeof(__be32) +
                                   sizeof(struct yfs_xdr_RPCFlags) +
                                   sizeof(struct yfs_xdr_YFSFid) +
                                   xdr_strlen(name->len),
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSFid) +
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSVolSync));
        if (!call)
                return afs_op_nomem(op);

        /* marshall the parameters */
        bp = call->request;
        bp = xdr_encode_u32(bp, YFSREMOVEFILE2);
        bp = xdr_encode_u32(bp, 0); /* RPC flags */
        bp = xdr_encode_YFSFid(bp, &dvp->fid);
        bp = xdr_encode_name(bp, name);
        yfs_check_req(call, bp);

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

/*
 * Deliver reply data to a YFS.RemoveFile or YFS.RemoveDir operation.
 */
static int yfs_deliver_fs_remove(struct afs_call *call)
{
        struct afs_operation *op = call->op;
        struct afs_vnode_param *dvp = &op->file[0];
        const __be32 *bp;
        int ret;

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

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

        bp = call->buffer;
        xdr_decode_YFSFetchStatus(&bp, call, &dvp->scb);
        xdr_decode_YFSVolSync(&bp, &op->volsync);
        return 0;
}

/*
 * FS.RemoveDir and FS.RemoveFile operation types.
 */
static const struct afs_call_type yfs_RXYFSRemoveFile = {
        .name           = "YFS.RemoveFile",
        .op             = yfs_FS_RemoveFile,
        .deliver        = yfs_deliver_fs_remove,
        .destructor     = afs_flat_call_destructor,
};

/*
 * Remove a file.
 */
void yfs_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;
        __be32 *bp;

        _enter("");

        if (!test_bit(AFS_SERVER_FL_NO_RM2, &op->server->flags))
                return yfs_fs_remove_file2(op);

        call = afs_alloc_flat_call(op->net, &yfs_RXYFSRemoveFile,
                                   sizeof(__be32) +
                                   sizeof(struct yfs_xdr_RPCFlags) +
                                   sizeof(struct yfs_xdr_YFSFid) +
                                   xdr_strlen(name->len),
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSVolSync));
        if (!call)
                return afs_op_nomem(op);

        /* marshall the parameters */
        bp = call->request;
        bp = xdr_encode_u32(bp, YFSREMOVEFILE);
        bp = xdr_encode_u32(bp, 0); /* RPC flags */
        bp = xdr_encode_YFSFid(bp, &dvp->fid);
        bp = xdr_encode_name(bp, name);
        yfs_check_req(call, bp);

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

static const struct afs_call_type yfs_RXYFSRemoveDir = {
        .name           = "YFS.RemoveDir",
        .op             = yfs_FS_RemoveDir,
        .deliver        = yfs_deliver_fs_remove,
        .destructor     = afs_flat_call_destructor,
};

/*
 * Remove a directory.
 */
void yfs_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;
        __be32 *bp;

        _enter("");

        call = afs_alloc_flat_call(op->net, &yfs_RXYFSRemoveDir,
                                   sizeof(__be32) +
                                   sizeof(struct yfs_xdr_RPCFlags) +
                                   sizeof(struct yfs_xdr_YFSFid) +
                                   xdr_strlen(name->len),
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSVolSync));
        if (!call)
                return afs_op_nomem(op);

        /* marshall the parameters */
        bp = call->request;
        bp = xdr_encode_u32(bp, YFSREMOVEDIR);
        bp = xdr_encode_u32(bp, 0); /* RPC flags */
        bp = xdr_encode_YFSFid(bp, &dvp->fid);
        bp = xdr_encode_name(bp, name);
        yfs_check_req(call, bp);

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

/*
 * Deliver reply data to a YFS.Link operation.
 */
static int yfs_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;

        bp = call->buffer;
        xdr_decode_YFSFetchStatus(&bp, call, &vp->scb);
        xdr_decode_YFSFetchStatus(&bp, call, &dvp->scb);
        xdr_decode_YFSVolSync(&bp, &op->volsync);
        _leave(" = 0 [done]");
        return 0;
}

/*
 * YFS.Link operation type.
 */
static const struct afs_call_type yfs_RXYFSLink = {
        .name           = "YFS.Link",
        .op             = yfs_FS_Link,
        .deliver        = yfs_deliver_fs_link,
        .destructor     = afs_flat_call_destructor,
};

/*
 * Make a hard link.
 */
void yfs_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;
        __be32 *bp;

        _enter("");

        call = afs_alloc_flat_call(op->net, &yfs_RXYFSLink,
                                   sizeof(__be32) +
                                   sizeof(struct yfs_xdr_RPCFlags) +
                                   sizeof(struct yfs_xdr_YFSFid) +
                                   xdr_strlen(name->len) +
                                   sizeof(struct yfs_xdr_YFSFid),
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSVolSync));
        if (!call)
                return afs_op_nomem(op);

        /* marshall the parameters */
        bp = call->request;
        bp = xdr_encode_u32(bp, YFSLINK);
        bp = xdr_encode_u32(bp, 0); /* RPC flags */
        bp = xdr_encode_YFSFid(bp, &dvp->fid);
        bp = xdr_encode_name(bp, name);
        bp = xdr_encode_YFSFid(bp, &vp->fid);
        yfs_check_req(call, bp);

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

/*
 * Deliver reply data to a YFS.Symlink operation.
 */
static int yfs_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_YFSFid(&bp, &vp->fid);
        xdr_decode_YFSFetchStatus(&bp, call, &vp->scb);
        xdr_decode_YFSFetchStatus(&bp, call, &dvp->scb);
        xdr_decode_YFSVolSync(&bp, &op->volsync);

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

/*
 * YFS.Symlink operation type
 */
static const struct afs_call_type yfs_RXYFSSymlink = {
        .name           = "YFS.Symlink",
        .op             = yfs_FS_Symlink,
        .deliver        = yfs_deliver_fs_symlink,
        .destructor     = afs_flat_call_destructor,
};

/*
 * Create a symbolic link.
 */
void yfs_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 contents_sz;
        __be32 *bp;

        _enter("");

        contents_sz = strlen(op->create.symlink);
        call = afs_alloc_flat_call(op->net, &yfs_RXYFSSymlink,
                                   sizeof(__be32) +
                                   sizeof(struct yfs_xdr_RPCFlags) +
                                   sizeof(struct yfs_xdr_YFSFid) +
                                   xdr_strlen(name->len) +
                                   xdr_strlen(contents_sz) +
                                   sizeof(struct yfs_xdr_YFSStoreStatus),
                                   sizeof(struct yfs_xdr_YFSFid) +
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSVolSync));
        if (!call)
                return afs_op_nomem(op);

        /* marshall the parameters */
        bp = call->request;
        bp = xdr_encode_u32(bp, YFSSYMLINK);
        bp = xdr_encode_u32(bp, 0); /* RPC flags */
        bp = xdr_encode_YFSFid(bp, &dvp->fid);
        bp = xdr_encode_name(bp, name);
        bp = xdr_encode_string(bp, op->create.symlink, contents_sz);
        bp = xdr_encode_YFSStoreStatus_mode(bp, S_IRWXUGO);
        yfs_check_req(call, bp);

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

/*
 * Deliver reply data to a YFS.Rename operation.
 */
static int yfs_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;

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

        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_YFSFetchStatus(&bp, call, &orig_dvp->scb);
        xdr_decode_YFSFetchStatus(&bp, call, &new_dvp->scb);
        xdr_decode_YFSVolSync(&bp, &op->volsync);
        _leave(" = 0 [done]");
        return 0;
}

/*
 * YFS.Rename operation type
 */
static const struct afs_call_type yfs_RXYFSRename = {
        .name           = "FS.Rename",
        .op             = yfs_FS_Rename,
        .deliver        = yfs_deliver_fs_rename,
        .destructor     = afs_flat_call_destructor,
};

/*
 * Rename a file or directory.
 */
void yfs_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;
        __be32 *bp;

        _enter("");

        call = afs_alloc_flat_call(op->net, &yfs_RXYFSRename,
                                   sizeof(__be32) +
                                   sizeof(struct yfs_xdr_RPCFlags) +
                                   sizeof(struct yfs_xdr_YFSFid) +
                                   xdr_strlen(orig_name->len) +
                                   sizeof(struct yfs_xdr_YFSFid) +
                                   xdr_strlen(new_name->len),
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSVolSync));
        if (!call)
                return afs_op_nomem(op);

        /* marshall the parameters */
        bp = call->request;
        bp = xdr_encode_u32(bp, YFSRENAME);
        bp = xdr_encode_u32(bp, 0); /* RPC flags */
        bp = xdr_encode_YFSFid(bp, &orig_dvp->fid);
        bp = xdr_encode_name(bp, orig_name);
        bp = xdr_encode_YFSFid(bp, &new_dvp->fid);
        bp = xdr_encode_name(bp, new_name);
        yfs_check_req(call, bp);

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

/*
 * YFS.StoreData64 operation type.
 */
static const struct afs_call_type yfs_RXYFSStoreData64 = {
        .name           = "YFS.StoreData64",
        .op             = yfs_FS_StoreData64,
        .deliver        = yfs_deliver_status_and_volsync,
        .destructor     = afs_flat_call_destructor,
};

/*
 * Store a set of pages to a large file.
 */
void yfs_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);

        call = afs_alloc_flat_call(op->net, &yfs_RXYFSStoreData64,
                                   sizeof(__be32) +
                                   sizeof(__be32) +
                                   sizeof(struct yfs_xdr_YFSFid) +
                                   sizeof(struct yfs_xdr_YFSStoreStatus) +
                                   sizeof(struct yfs_xdr_u64) * 3,
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSVolSync));
        if (!call)
                return afs_op_nomem(op);

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

        /* marshall the parameters */
        bp = call->request;
        bp = xdr_encode_u32(bp, YFSSTOREDATA64);
        bp = xdr_encode_u32(bp, 0); /* RPC flags */
        bp = xdr_encode_YFSFid(bp, &vp->fid);
        bp = xdr_encode_YFSStoreStatus_mtime(bp, &op->mtime);
        bp = xdr_encode_u64(bp, op->store.pos);
        bp = xdr_encode_u64(bp, op->store.size);
        bp = xdr_encode_u64(bp, op->store.i_size);
        yfs_check_req(call, bp);

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

/*
 * YFS.StoreStatus operation type
 */
static const struct afs_call_type yfs_RXYFSStoreStatus = {
        .name           = "YFS.StoreStatus",
        .op             = yfs_FS_StoreStatus,
        .deliver        = yfs_deliver_status_and_volsync,
        .destructor     = afs_flat_call_destructor,
};

static const struct afs_call_type yfs_RXYFSStoreData64_as_Status = {
        .name           = "YFS.StoreData64",
        .op             = yfs_FS_StoreData64,
        .deliver        = yfs_deliver_status_and_volsync,
        .destructor     = afs_flat_call_destructor,
};

/*
 * Set the attributes on a file, using YFS.StoreData64 rather than
 * YFS.StoreStatus so as to alter the file size also.
 */
static void yfs_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);

        call = afs_alloc_flat_call(op->net, &yfs_RXYFSStoreData64_as_Status,
                                   sizeof(__be32) * 2 +
                                   sizeof(struct yfs_xdr_YFSFid) +
                                   sizeof(struct yfs_xdr_YFSStoreStatus) +
                                   sizeof(struct yfs_xdr_u64) * 3,
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSVolSync));
        if (!call)
                return afs_op_nomem(op);

        /* marshall the parameters */
        bp = call->request;
        bp = xdr_encode_u32(bp, YFSSTOREDATA64);
        bp = xdr_encode_u32(bp, 0); /* RPC flags */
        bp = xdr_encode_YFSFid(bp, &vp->fid);
        bp = xdr_encode_YFS_StoreStatus(bp, attr);
        bp = xdr_encode_u64(bp, attr->ia_size); /* position of start of write */
        bp = xdr_encode_u64(bp, 0);             /* size of write */
        bp = xdr_encode_u64(bp, attr->ia_size); /* new file length */
        yfs_check_req(call, bp);

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

/*
 * Set the attributes on a file, using YFS.StoreData64 if there's a change in
 * file size, and YFS.StoreStatus otherwise.
 */
void yfs_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 yfs_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, &yfs_RXYFSStoreStatus,
                                   sizeof(__be32) * 2 +
                                   sizeof(struct yfs_xdr_YFSFid) +
                                   sizeof(struct yfs_xdr_YFSStoreStatus),
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSVolSync));
        if (!call)
                return afs_op_nomem(op);

        /* marshall the parameters */
        bp = call->request;
        bp = xdr_encode_u32(bp, YFSSTORESTATUS);
        bp = xdr_encode_u32(bp, 0); /* RPC flags */
        bp = xdr_encode_YFSFid(bp, &vp->fid);
        bp = xdr_encode_YFS_StoreStatus(bp, attr);
        yfs_check_req(call, bp);

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

/*
 * Deliver reply data to a YFS.GetVolumeStatus operation.
 */
static int yfs_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, sizeof(struct yfs_xdr_YFSFetchVolumeStatus));
                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_YFSFetchVolumeStatus(&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;
}

/*
 * YFS.GetVolumeStatus operation type
 */
static const struct afs_call_type yfs_RXYFSGetVolumeStatus = {
        .name           = "YFS.GetVolumeStatus",
        .op             = yfs_FS_GetVolumeStatus,
        .deliver        = yfs_deliver_fs_get_volume_status,
        .destructor     = afs_flat_call_destructor,
};

/*
 * fetch the status of a volume
 */
void yfs_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, &yfs_RXYFSGetVolumeStatus,
                                   sizeof(__be32) * 2 +
                                   sizeof(struct yfs_xdr_u64),
                                   max_t(size_t,
                                         sizeof(struct yfs_xdr_YFSFetchVolumeStatus) +
                                         sizeof(__be32),
                                         AFSOPAQUEMAX + 1));
        if (!call)
                return afs_op_nomem(op);

        /* marshall the parameters */
        bp = call->request;
        bp = xdr_encode_u32(bp, YFSGETVOLUMESTATUS);
        bp = xdr_encode_u32(bp, 0); /* RPC flags */
        bp = xdr_encode_u64(bp, vp->fid.vid);
        yfs_check_req(call, bp);

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

/*
 * YFS.SetLock operation type
 */
static const struct afs_call_type yfs_RXYFSSetLock = {
        .name           = "YFS.SetLock",
        .op             = yfs_FS_SetLock,
        .deliver        = yfs_deliver_status_and_volsync,
        .done           = afs_lock_op_done,
        .destructor     = afs_flat_call_destructor,
};

/*
 * YFS.ExtendLock operation type
 */
static const struct afs_call_type yfs_RXYFSExtendLock = {
        .name           = "YFS.ExtendLock",
        .op             = yfs_FS_ExtendLock,
        .deliver        = yfs_deliver_status_and_volsync,
        .done           = afs_lock_op_done,
        .destructor     = afs_flat_call_destructor,
};

/*
 * YFS.ReleaseLock operation type
 */
static const struct afs_call_type yfs_RXYFSReleaseLock = {
        .name           = "YFS.ReleaseLock",
        .op             = yfs_FS_ReleaseLock,
        .deliver        = yfs_deliver_status_and_volsync,
        .destructor     = afs_flat_call_destructor,
};

/*
 * Set a lock on a file
 */
void yfs_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, &yfs_RXYFSSetLock,
                                   sizeof(__be32) * 2 +
                                   sizeof(struct yfs_xdr_YFSFid) +
                                   sizeof(__be32),
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSVolSync));
        if (!call)
                return afs_op_nomem(op);

        /* marshall the parameters */
        bp = call->request;
        bp = xdr_encode_u32(bp, YFSSETLOCK);
        bp = xdr_encode_u32(bp, 0); /* RPC flags */
        bp = xdr_encode_YFSFid(bp, &vp->fid);
        bp = xdr_encode_u32(bp, op->lock.type);
        yfs_check_req(call, bp);

        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 yfs_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, &yfs_RXYFSExtendLock,
                                   sizeof(__be32) * 2 +
                                   sizeof(struct yfs_xdr_YFSFid),
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSVolSync));
        if (!call)
                return afs_op_nomem(op);

        /* marshall the parameters */
        bp = call->request;
        bp = xdr_encode_u32(bp, YFSEXTENDLOCK);
        bp = xdr_encode_u32(bp, 0); /* RPC flags */
        bp = xdr_encode_YFSFid(bp, &vp->fid);
        yfs_check_req(call, bp);

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

/*
 * release a lock on a file
 */
void yfs_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, &yfs_RXYFSReleaseLock,
                                   sizeof(__be32) * 2 +
                                   sizeof(struct yfs_xdr_YFSFid),
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSVolSync));
        if (!call)
                return afs_op_nomem(op);

        /* marshall the parameters */
        bp = call->request;
        bp = xdr_encode_u32(bp, YFSRELEASELOCK);
        bp = xdr_encode_u32(bp, 0); /* RPC flags */
        bp = xdr_encode_YFSFid(bp, &vp->fid);
        yfs_check_req(call, bp);

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

/*
 * Deliver a reply to YFS.FetchStatus
 */
static int yfs_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_YFSFetchStatus(&bp, call, &vp->scb);
        xdr_decode_YFSCallBack(&bp, call, &vp->scb);
        xdr_decode_YFSVolSync(&bp, &op->volsync);

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

/*
 * YFS.FetchStatus operation type
 */
static const struct afs_call_type yfs_RXYFSFetchStatus = {
        .name           = "YFS.FetchStatus",
        .op             = yfs_FS_FetchStatus,
        .deliver        = yfs_deliver_fs_fetch_status,
        .destructor     = afs_flat_call_destructor,
};

/*
 * Fetch the status information for a fid without needing a vnode handle.
 */
void yfs_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, &yfs_RXYFSFetchStatus,
                                   sizeof(__be32) * 2 +
                                   sizeof(struct yfs_xdr_YFSFid),
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSCallBack) +
                                   sizeof(struct yfs_xdr_YFSVolSync));
        if (!call)
                return afs_op_nomem(op);

        /* marshall the parameters */
        bp = call->request;
        bp = xdr_encode_u32(bp, YFSFETCHSTATUS);
        bp = xdr_encode_u32(bp, 0); /* RPC flags */
        bp = xdr_encode_YFSFid(bp, &vp->fid);
        yfs_check_req(call, bp);

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

/*
 * Deliver reply data to an YFS.InlineBulkStatus call
 */
static int yfs_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, sizeof(struct yfs_xdr_YFSFetchStatus));
                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_YFSFetchStatus(&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, sizeof(struct yfs_xdr_YFSCallBack));
                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_YFSCallBack(&bp, call, scb);
                call->count++;
                if (call->count < op->nr_files)
                        goto more_cbs;

                afs_extract_to_buf(call, sizeof(struct yfs_xdr_YFSVolSync));
                call->unmarshall++;
                fallthrough;

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

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

                call->unmarshall++;
                fallthrough;

        case 6:
                break;
        }

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

/*
 * FS.InlineBulkStatus operation type
 */
static const struct afs_call_type yfs_RXYFSInlineBulkStatus = {
        .name           = "YFS.InlineBulkStatus",
        .op             = yfs_FS_InlineBulkStatus,
        .deliver        = yfs_deliver_fs_inline_bulk_status,
        .destructor     = afs_flat_call_destructor,
};

/*
 * Fetch the status information for up to 1024 files
 */
void yfs_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;

        _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, &yfs_RXYFSInlineBulkStatus,
                                   sizeof(__be32) +
                                   sizeof(__be32) +
                                   sizeof(__be32) +
                                   sizeof(struct yfs_xdr_YFSFid) * op->nr_files,
                                   sizeof(struct yfs_xdr_YFSFetchStatus));
        if (!call)
                return afs_op_nomem(op);

        /* marshall the parameters */
        bp = call->request;
        bp = xdr_encode_u32(bp, YFSINLINEBULKSTATUS);
        bp = xdr_encode_u32(bp, 0); /* RPCFlags */
        bp = xdr_encode_u32(bp, op->nr_files);
        bp = xdr_encode_YFSFid(bp, &dvp->fid);
        bp = xdr_encode_YFSFid(bp, &vp->fid);
        for (i = 0; i < op->nr_files - 2; i++)
                bp = xdr_encode_YFSFid(bp, &op->more_files[i].fid);
        yfs_check_req(call, bp);

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

/*
 * Deliver reply data to an YFS.FetchOpaqueACL.
 */
static int yfs_deliver_fs_fetch_opaque_acl(struct afs_call *call)
{
        struct afs_operation *op = call->op;
        struct afs_vnode_param *vp = &op->file[0];
        struct yfs_acl *yacl = op->yacl;
        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 file ACL 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);

                if (yacl->flags & YFS_ACL_WANT_ACL) {
                        acl = kmalloc(struct_size(acl, data, size), GFP_KERNEL);
                        if (!acl)
                                return -ENOMEM;
                        yacl->acl = acl;
                        acl->size = call->count2;
                        afs_extract_begin(call, acl->data, size);
                } else {
                        afs_extract_discard(call, size);
                }
                call->unmarshall++;
                fallthrough;

                /* Extract the file ACL */
        case 2:
                ret = afs_extract_data(call, true);
                if (ret < 0)
                        return ret;

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

                /* Extract the volume ACL length */
        case 3:
                ret = afs_extract_data(call, true);
                if (ret < 0)
                        return ret;

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

                if (yacl->flags & YFS_ACL_WANT_VOL_ACL) {
                        acl = kmalloc(struct_size(acl, data, size), GFP_KERNEL);
                        if (!acl)
                                return -ENOMEM;
                        yacl->vol_acl = acl;
                        acl->size = call->count2;
                        afs_extract_begin(call, acl->data, size);
                } else {
                        afs_extract_discard(call, size);
                }
                call->unmarshall++;
                fallthrough;

                /* Extract the volume ACL */
        case 4:
                ret = afs_extract_data(call, true);
                if (ret < 0)
                        return ret;

                afs_extract_to_buf(call,
                                   sizeof(__be32) * 2 +
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSVolSync));
                call->unmarshall++;
                fallthrough;

                /* extract the metadata */
        case 5:
                ret = afs_extract_data(call, false);
                if (ret < 0)
                        return ret;

                bp = call->buffer;
                yacl->inherit_flag = ntohl(*bp++);
                yacl->num_cleaned = ntohl(*bp++);
                xdr_decode_YFSFetchStatus(&bp, call, &vp->scb);
                xdr_decode_YFSVolSync(&bp, &op->volsync);

                call->unmarshall++;
                fallthrough;

        case 6:
                break;
        }

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

void yfs_free_opaque_acl(struct yfs_acl *yacl)
{
        if (yacl) {
                kfree(yacl->acl);
                kfree(yacl->vol_acl);
                kfree(yacl);
        }
}

/*
 * YFS.FetchOpaqueACL operation type
 */
static const struct afs_call_type yfs_RXYFSFetchOpaqueACL = {
        .name           = "YFS.FetchOpaqueACL",
        .op             = yfs_FS_FetchOpaqueACL,
        .deliver        = yfs_deliver_fs_fetch_opaque_acl,
        .destructor     = afs_flat_call_destructor,
};

/*
 * Fetch the YFS advanced ACLs for a file.
 */
void yfs_fs_fetch_opaque_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, &yfs_RXYFSFetchOpaqueACL,
                                   sizeof(__be32) * 2 +
                                   sizeof(struct yfs_xdr_YFSFid),
                                   sizeof(__be32) * 2 +
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSVolSync));
        if (!call)
                return afs_op_nomem(op);

        /* marshall the parameters */
        bp = call->request;
        bp = xdr_encode_u32(bp, YFSFETCHOPAQUEACL);
        bp = xdr_encode_u32(bp, 0); /* RPC flags */
        bp = xdr_encode_YFSFid(bp, &vp->fid);
        yfs_check_req(call, bp);

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

/*
 * YFS.StoreOpaqueACL2 operation type
 */
static const struct afs_call_type yfs_RXYFSStoreOpaqueACL2 = {
        .name           = "YFS.StoreOpaqueACL2",
        .op             = yfs_FS_StoreOpaqueACL2,
        .deliver        = yfs_deliver_status_and_volsync,
        .destructor     = afs_flat_call_destructor,
};

/*
 * Fetch the YFS ACL for a file.
 */
void yfs_fs_store_opaque_acl2(struct afs_operation *op)
{
        struct afs_vnode_param *vp = &op->file[0];
        struct afs_call *call;
        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, &yfs_RXYFSStoreOpaqueACL2,
                                   sizeof(__be32) * 2 +
                                   sizeof(struct yfs_xdr_YFSFid) +
                                   sizeof(__be32) + size,
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSVolSync));
        if (!call)
                return afs_op_nomem(op);

        /* marshall the parameters */
        bp = call->request;
        bp = xdr_encode_u32(bp, YFSSTOREOPAQUEACL2);
        bp = xdr_encode_u32(bp, 0); /* RPC flags */
        bp = xdr_encode_YFSFid(bp, &vp->fid);
        bp = xdr_encode_u32(bp, acl->size);
        memcpy(bp, acl->data, acl->size);
        if (acl->size != size)
                memset((void *)bp + acl->size, 0, size - acl->size);
        bp += size / sizeof(__be32);
        yfs_check_req(call, bp);

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