// 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"

static const struct afs_fid afs_zero_fid;

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

#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 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 < 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 a YFSFetchStatus block
 */
static int 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;
                return 0;
        }

        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;

        *_bp += xdr_size(xdr);
        return 0;

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

/*
 * 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 a reply that's a status, callback and volsync.
 */
static int yfs_deliver_fs_status_cb_and_volsync(struct afs_call *call)
{
        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;
        ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
        if (ret < 0)
                return ret;
        xdr_decode_YFSCallBack(&bp, call, call->out_scb);
        xdr_decode_YFSVolSync(&bp, call->out_volsync);

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

/*
 * 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)
{
        const __be32 *bp;
        int ret;

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

        bp = call->buffer;
        ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
        if (ret < 0)
                return ret;
        xdr_decode_YFSVolSync(&bp, call->out_volsync);

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

/*
 * YFS.FetchStatus operation type
 */
static const struct afs_call_type yfs_RXYFSFetchStatus_vnode = {
        .name           = "YFS.FetchStatus(vnode)",
        .op             = yfs_FS_FetchStatus,
        .deliver        = yfs_deliver_fs_status_cb_and_volsync,
        .destructor     = afs_flat_call_destructor,
};

/*
 * Fetch the status information for a file.
 */
int yfs_fs_fetch_file_status(struct afs_fs_cursor *fc, struct afs_status_cb *scb,
                             struct afs_volsync *volsync)
{
        struct afs_vnode *vnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(vnode);
        __be32 *bp;

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

        call = afs_alloc_flat_call(net, &yfs_RXYFSFetchStatus_vnode,
                                   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) {
                fc->ac.error = -ENOMEM;
                return -ENOMEM;
        }

        call->key = fc->key;
        call->out_scb = scb;
        call->out_volsync = volsync;

        /* 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, &vnode->fid);
        yfs_check_req(call, bp);

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

/*
 * Deliver reply data to an YFS.FetchData64.
 */
static int yfs_deliver_fs_fetch_data64(struct afs_call *call)
{
        struct afs_read *req = call->read_request;
        const __be32 *bp;
        unsigned int size;
        int ret;

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

        switch (call->unmarshall) {
        case 0:
                req->actual_len = 0;
                req->index = 0;
                req->offset = req->pos & (PAGE_SIZE - 1);
                afs_extract_to_tmp64(call);
                call->unmarshall++;
                /* Fall through */

                /* extract the returned data length */
        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);
                req->remain = min(req->len, req->actual_len);
                if (req->remain == 0)
                        goto no_more_data;

                call->unmarshall++;

        begin_page:
                ASSERTCMP(req->index, <, req->nr_pages);
                if (req->remain > PAGE_SIZE - req->offset)
                        size = PAGE_SIZE - req->offset;
                else
                        size = req->remain;
                call->bvec[0].bv_len = size;
                call->bvec[0].bv_offset = req->offset;
                call->bvec[0].bv_page = req->pages[req->index];
                iov_iter_bvec(&call->def_iter, READ, call->bvec, 1, size);
                ASSERTCMP(size, <=, PAGE_SIZE);
                /* Fall through */

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

                ret = afs_extract_data(call, true);
                if (ret < 0)
                        return ret;
                req->remain -= call->bvec[0].bv_len;
                req->offset += call->bvec[0].bv_len;
                ASSERTCMP(req->offset, <=, PAGE_SIZE);
                if (req->offset == PAGE_SIZE) {
                        req->offset = 0;
                        if (req->page_done)
                                req->page_done(req);
                        req->index++;
                        if (req->remain > 0)
                                goto begin_page;
                }

                ASSERTCMP(req->remain, ==, 0);
                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;
                /* Fall through */

        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));
                /* Fall through */

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

                bp = call->buffer;
                ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
                if (ret < 0)
                        return ret;
                xdr_decode_YFSCallBack(&bp, call, call->out_scb);
                xdr_decode_YFSVolSync(&bp, call->out_volsync);

                req->data_version = call->out_scb->status.data_version;
                req->file_size = call->out_scb->status.size;

                call->unmarshall++;
                /* Fall through */

        case 5:
                break;
        }

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

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

static void yfs_fetch_data_destructor(struct afs_call *call)
{
        afs_put_read(call->read_request);
        afs_flat_call_destructor(call);
}

/*
 * 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     = yfs_fetch_data_destructor,
};

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

        _enter(",%x,{%llx:%llu},%llx,%llx",
               key_serial(fc->key), vnode->fid.vid, vnode->fid.vnode,
               req->pos, req->len);

        call = afs_alloc_flat_call(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 -ENOMEM;

        call->key = fc->key;
        call->out_scb = scb;
        call->out_volsync = NULL;
        call->read_request = afs_get_read(req);

        /* 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, &vnode->fid);
        bp = xdr_encode_u64(bp, req->pos);
        bp = xdr_encode_u64(bp, req->len);
        yfs_check_req(call, bp);

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

/*
 * Deliver reply data for YFS.CreateFile or YFS.MakeDir.
 */
static int yfs_deliver_fs_create_vnode(struct afs_call *call)
{
        const __be32 *bp;
        int ret;

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

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

        /* unmarshall the reply once we've received all of it */
        bp = call->buffer;
        xdr_decode_YFSFid(&bp, call->out_fid);
        ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
        if (ret < 0)
                return ret;
        ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_dir_scb);
        if (ret < 0)
                return ret;
        xdr_decode_YFSCallBack(&bp, call, call->out_scb);
        xdr_decode_YFSVolSync(&bp, call->out_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.
 */
int yfs_fs_create_file(struct afs_fs_cursor *fc,
                       const char *name,
                       umode_t mode,
                       struct afs_status_cb *dvnode_scb,
                       struct afs_fid *newfid,
                       struct afs_status_cb *new_scb)
{
        struct afs_vnode *dvnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(dvnode);
        size_t namesz, reqsz, rplsz;
        __be32 *bp;

        _enter("");

        namesz = strlen(name);
        reqsz = (sizeof(__be32) +
                 sizeof(__be32) +
                 sizeof(struct yfs_xdr_YFSFid) +
                 xdr_strlen(namesz) +
                 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(net, &afs_RXFSCreateFile, reqsz, rplsz);
        if (!call)
                return -ENOMEM;

        call->key = fc->key;
        call->out_dir_scb = dvnode_scb;
        call->out_fid = newfid;
        call->out_scb = new_scb;

        /* 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, &dvnode->fid);
        bp = xdr_encode_string(bp, name, namesz);
        bp = xdr_encode_YFSStoreStatus_mode(bp, mode);
        bp = xdr_encode_u32(bp, yfs_LockNone); /* ViceLockType */
        yfs_check_req(call, bp);

        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call1(call, &dvnode->fid, name);
        afs_set_fc_call(call, fc);
        afs_make_call(&fc->ac, call, GFP_NOFS);
        return afs_wait_for_call_to_complete(call, &fc->ac);
}

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.
 */
int yfs_fs_make_dir(struct afs_fs_cursor *fc,
                    const char *name,
                    umode_t mode,
                    struct afs_status_cb *dvnode_scb,
                    struct afs_fid *newfid,
                    struct afs_status_cb *new_scb)
{
        struct afs_vnode *dvnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(dvnode);
        size_t namesz, reqsz, rplsz;
        __be32 *bp;

        _enter("");

        namesz = strlen(name);
        reqsz = (sizeof(__be32) +
                 sizeof(struct yfs_xdr_RPCFlags) +
                 sizeof(struct yfs_xdr_YFSFid) +
                 xdr_strlen(namesz) +
                 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(net, &yfs_RXFSMakeDir, reqsz, rplsz);
        if (!call)
                return -ENOMEM;

        call->key = fc->key;
        call->out_dir_scb = dvnode_scb;
        call->out_fid = newfid;
        call->out_scb = new_scb;

        /* 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, &dvnode->fid);
        bp = xdr_encode_string(bp, name, namesz);
        bp = xdr_encode_YFSStoreStatus_mode(bp, mode);
        yfs_check_req(call, bp);

        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call1(call, &dvnode->fid, name);
        afs_set_fc_call(call, fc);
        afs_make_call(&fc->ac, call, GFP_NOFS);
        return afs_wait_for_call_to_complete(call, &fc->ac);
}

/*
 * Deliver reply data to a YFS.RemoveFile2 operation.
 */
static int yfs_deliver_fs_remove_file2(struct afs_call *call)
{
        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;
        ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_dir_scb);
        if (ret < 0)
                return ret;

        xdr_decode_YFSFid(&bp, &fid);
        ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
        if (ret < 0)
                return ret;
        /* Was deleted if vnode->status.abort_code == VNOVNODE. */

        xdr_decode_YFSVolSync(&bp, call->out_volsync);
        return 0;
}

/*
 * 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,
        .destructor     = afs_flat_call_destructor,
};

/*
 * Remove a file and retrieve new file status.
 */
int yfs_fs_remove_file2(struct afs_fs_cursor *fc, struct afs_vnode *vnode,
                        const char *name, struct afs_status_cb *dvnode_scb,
                        struct afs_status_cb *vnode_scb)
{
        struct afs_vnode *dvnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(dvnode);
        size_t namesz;
        __be32 *bp;

        _enter("");

        namesz = strlen(name);

        call = afs_alloc_flat_call(net, &yfs_RXYFSRemoveFile2,
                                   sizeof(__be32) +
                                   sizeof(struct yfs_xdr_RPCFlags) +
                                   sizeof(struct yfs_xdr_YFSFid) +
                                   xdr_strlen(namesz),
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSFid) +
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSVolSync));
        if (!call)
                return -ENOMEM;

        call->key = fc->key;
        call->out_dir_scb = dvnode_scb;
        call->out_scb = vnode_scb;

        /* 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, &dvnode->fid);
        bp = xdr_encode_string(bp, name, namesz);
        yfs_check_req(call, bp);

        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call1(call, &dvnode->fid, name);
        afs_set_fc_call(call, fc);
        afs_make_call(&fc->ac, call, GFP_NOFS);
        return afs_wait_for_call_to_complete(call, &fc->ac);
}

/*
 * Deliver reply data to a YFS.RemoveFile or YFS.RemoveDir operation.
 */
static int yfs_deliver_fs_remove(struct afs_call *call)
{
        const __be32 *bp;
        int ret;

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

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

        bp = call->buffer;
        ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_dir_scb);
        if (ret < 0)
                return ret;

        xdr_decode_YFSVolSync(&bp, call->out_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,
};

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 file or directory
 */
int yfs_fs_remove(struct afs_fs_cursor *fc, struct afs_vnode *vnode,
                  const char *name, bool isdir,
                  struct afs_status_cb *dvnode_scb)
{
        struct afs_vnode *dvnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(dvnode);
        size_t namesz;
        __be32 *bp;

        _enter("");

        namesz = strlen(name);
        call = afs_alloc_flat_call(
                net, isdir ? &yfs_RXYFSRemoveDir : &yfs_RXYFSRemoveFile,
                sizeof(__be32) +
                sizeof(struct yfs_xdr_RPCFlags) +
                sizeof(struct yfs_xdr_YFSFid) +
                xdr_strlen(namesz),
                sizeof(struct yfs_xdr_YFSFetchStatus) +
                sizeof(struct yfs_xdr_YFSVolSync));
        if (!call)
                return -ENOMEM;

        call->key = fc->key;
        call->out_dir_scb = dvnode_scb;

        /* marshall the parameters */
        bp = call->request;
        bp = xdr_encode_u32(bp, isdir ? YFSREMOVEDIR : YFSREMOVEFILE);
        bp = xdr_encode_u32(bp, 0); /* RPC flags */
        bp = xdr_encode_YFSFid(bp, &dvnode->fid);
        bp = xdr_encode_string(bp, name, namesz);
        yfs_check_req(call, bp);

        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call1(call, &dvnode->fid, name);
        afs_set_fc_call(call, fc);
        afs_make_call(&fc->ac, call, GFP_NOFS);
        return afs_wait_for_call_to_complete(call, &fc->ac);
}

/*
 * Deliver reply data to a YFS.Link operation.
 */
static int yfs_deliver_fs_link(struct afs_call *call)
{
        const __be32 *bp;
        int ret;

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

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

        bp = call->buffer;
        ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
        if (ret < 0)
                return ret;
        ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_dir_scb);
        if (ret < 0)
                return ret;
        xdr_decode_YFSVolSync(&bp, call->out_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.
 */
int yfs_fs_link(struct afs_fs_cursor *fc, struct afs_vnode *vnode,
                const char *name,
                struct afs_status_cb *dvnode_scb,
                struct afs_status_cb *vnode_scb)

{
        struct afs_vnode *dvnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(vnode);
        size_t namesz;
        __be32 *bp;

        _enter("");

        namesz = strlen(name);
        call = afs_alloc_flat_call(net, &yfs_RXYFSLink,
                                   sizeof(__be32) +
                                   sizeof(struct yfs_xdr_RPCFlags) +
                                   sizeof(struct yfs_xdr_YFSFid) +
                                   xdr_strlen(namesz) +
                                   sizeof(struct yfs_xdr_YFSFid),
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSVolSync));
        if (!call)
                return -ENOMEM;

        call->key = fc->key;
        call->out_dir_scb = dvnode_scb;
        call->out_scb = vnode_scb;

        /* 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, &dvnode->fid);
        bp = xdr_encode_string(bp, name, namesz);
        bp = xdr_encode_YFSFid(bp, &vnode->fid);
        yfs_check_req(call, bp);

        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call1(call, &vnode->fid, name);
        afs_set_fc_call(call, fc);
        afs_make_call(&fc->ac, call, GFP_NOFS);
        return afs_wait_for_call_to_complete(call, &fc->ac);
}

/*
 * Deliver reply data to a YFS.Symlink operation.
 */
static int yfs_deliver_fs_symlink(struct afs_call *call)
{
        const __be32 *bp;
        int ret;

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

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

        /* unmarshall the reply once we've received all of it */
        bp = call->buffer;
        xdr_decode_YFSFid(&bp, call->out_fid);
        ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
        if (ret < 0)
                return ret;
        ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_dir_scb);
        if (ret < 0)
                return ret;
        xdr_decode_YFSVolSync(&bp, call->out_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.
 */
int yfs_fs_symlink(struct afs_fs_cursor *fc,
                   const char *name,
                   const char *contents,
                   struct afs_status_cb *dvnode_scb,
                   struct afs_fid *newfid,
                   struct afs_status_cb *vnode_scb)
{
        struct afs_vnode *dvnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(dvnode);
        size_t namesz, contents_sz;
        __be32 *bp;

        _enter("");

        namesz = strlen(name);
        contents_sz = strlen(contents);
        call = afs_alloc_flat_call(net, &yfs_RXYFSSymlink,
                                   sizeof(__be32) +
                                   sizeof(struct yfs_xdr_RPCFlags) +
                                   sizeof(struct yfs_xdr_YFSFid) +
                                   xdr_strlen(namesz) +
                                   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 -ENOMEM;

        call->key = fc->key;
        call->out_dir_scb = dvnode_scb;
        call->out_fid = newfid;
        call->out_scb = vnode_scb;

        /* 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, &dvnode->fid);
        bp = xdr_encode_string(bp, name, namesz);
        bp = xdr_encode_string(bp, contents, contents_sz);
        bp = xdr_encode_YFSStoreStatus_mode(bp, S_IRWXUGO);
        yfs_check_req(call, bp);

        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call1(call, &dvnode->fid, name);
        afs_set_fc_call(call, fc);
        afs_make_call(&fc->ac, call, GFP_NOFS);
        return afs_wait_for_call_to_complete(call, &fc->ac);
}

/*
 * Deliver reply data to a YFS.Rename operation.
 */
static int yfs_deliver_fs_rename(struct afs_call *call)
{
        const __be32 *bp;
        int ret;

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

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

        bp = call->buffer;
        ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_dir_scb);
        if (ret < 0)
                return ret;
        if (call->out_dir_scb != call->out_scb) {
                ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
                if (ret < 0)
                        return ret;
        }

        xdr_decode_YFSVolSync(&bp, call->out_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.
 */
int yfs_fs_rename(struct afs_fs_cursor *fc,
                  const char *orig_name,
                  struct afs_vnode *new_dvnode,
                  const char *new_name,
                  struct afs_status_cb *orig_dvnode_scb,
                  struct afs_status_cb *new_dvnode_scb)
{
        struct afs_vnode *orig_dvnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(orig_dvnode);
        size_t o_namesz, n_namesz;
        __be32 *bp;

        _enter("");

        o_namesz = strlen(orig_name);
        n_namesz = strlen(new_name);
        call = afs_alloc_flat_call(net, &yfs_RXYFSRename,
                                   sizeof(__be32) +
                                   sizeof(struct yfs_xdr_RPCFlags) +
                                   sizeof(struct yfs_xdr_YFSFid) +
                                   xdr_strlen(o_namesz) +
                                   sizeof(struct yfs_xdr_YFSFid) +
                                   xdr_strlen(n_namesz),
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSVolSync));
        if (!call)
                return -ENOMEM;

        call->key = fc->key;
        call->out_dir_scb = orig_dvnode_scb;
        call->out_scb = new_dvnode_scb;

        /* 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_dvnode->fid);
        bp = xdr_encode_string(bp, orig_name, o_namesz);
        bp = xdr_encode_YFSFid(bp, &new_dvnode->fid);
        bp = xdr_encode_string(bp, new_name, n_namesz);
        yfs_check_req(call, bp);

        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call2(call, &orig_dvnode->fid, orig_name, new_name);
        afs_set_fc_call(call, fc);
        afs_make_call(&fc->ac, call, GFP_NOFS);
        return afs_wait_for_call_to_complete(call, &fc->ac);
}

/*
 * 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.
 */
int yfs_fs_store_data(struct afs_fs_cursor *fc, struct address_space *mapping,
                      pgoff_t first, pgoff_t last,
                      unsigned offset, unsigned to,
                      struct afs_status_cb *scb)
{
        struct afs_vnode *vnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(vnode);
        loff_t size, pos, i_size;
        __be32 *bp;

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

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

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

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

        call = afs_alloc_flat_call(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 -ENOMEM;

        call->key = fc->key;
        call->mapping = mapping;
        call->first = first;
        call->last = last;
        call->first_offset = offset;
        call->last_to = to;
        call->send_pages = true;
        call->out_scb = scb;

        /* 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, &vnode->fid);
        bp = xdr_encode_YFSStoreStatus_mtime(bp, &vnode->vfs_inode.i_mtime);
        bp = xdr_encode_u64(bp, pos);
        bp = xdr_encode_u64(bp, size);
        bp = xdr_encode_u64(bp, i_size);
        yfs_check_req(call, bp);

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

/*
 * 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 int yfs_fs_setattr_size(struct afs_fs_cursor *fc, struct iattr *attr,
                               struct afs_status_cb *scb)
{
        struct afs_vnode *vnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(vnode);
        __be32 *bp;

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

        call = afs_alloc_flat_call(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 -ENOMEM;

        call->key = fc->key;
        call->out_scb = scb;

        /* 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, &vnode->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);

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

/*
 * Set the attributes on a file, using YFS.StoreData64 if there's a change in
 * file size, and YFS.StoreStatus otherwise.
 */
int yfs_fs_setattr(struct afs_fs_cursor *fc, struct iattr *attr,
                   struct afs_status_cb *scb)
{
        struct afs_vnode *vnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(vnode);
        __be32 *bp;

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

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

        call = afs_alloc_flat_call(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 -ENOMEM;

        call->key = fc->key;
        call->out_scb = scb;

        /* 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, &vnode->fid);
        bp = xdr_encode_YFS_StoreStatus(bp, attr);
        yfs_check_req(call, bp);

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

/*
 * Deliver reply data to a YFS.GetVolumeStatus operation.
 */
static int yfs_deliver_fs_get_volume_status(struct afs_call *call)
{
        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));
                /* Fall through */

                /* 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, call->out_volstatus);
                call->unmarshall++;
                afs_extract_to_tmp(call);
                /* Fall through */

                /* 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, -EBADMSG,
                                                  afs_eproto_volname_len);
                size = (call->count + 3) & ~3; /* It's padded */
                afs_extract_to_buf(call, size);
                call->unmarshall++;
                /* Fall through */

                /* 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++;
                /* Fall through */

                /* 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, -EBADMSG,
                                                  afs_eproto_offline_msg_len);
                size = (call->count + 3) & ~3; /* It's padded */
                afs_extract_to_buf(call, size);
                call->unmarshall++;
                /* Fall through */

                /* 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++;
                /* Fall through */

                /* 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, -EBADMSG,
                                                  afs_eproto_motd_len);
                size = (call->count + 3) & ~3; /* It's padded */
                afs_extract_to_buf(call, size);
                call->unmarshall++;
                /* Fall through */

                /* 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++;
                /* Fall through */

        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
 */
int yfs_fs_get_volume_status(struct afs_fs_cursor *fc,
                             struct afs_volume_status *vs)
{
        struct afs_vnode *vnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(vnode);
        __be32 *bp;

        _enter("");

        call = afs_alloc_flat_call(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 -ENOMEM;

        call->key = fc->key;
        call->out_volstatus = vs;

        /* 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, vnode->fid.vid);
        yfs_check_req(call, bp);

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

/*
 * 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
 */
int yfs_fs_set_lock(struct afs_fs_cursor *fc, afs_lock_type_t type,
                    struct afs_status_cb *scb)
{
        struct afs_vnode *vnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(vnode);
        __be32 *bp;

        _enter("");

        call = afs_alloc_flat_call(net, &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 -ENOMEM;

        call->key = fc->key;
        call->lvnode = vnode;
        call->out_scb = scb;

        /* 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, &vnode->fid);
        bp = xdr_encode_u32(bp, type);
        yfs_check_req(call, bp);

        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_calli(call, &vnode->fid, type);
        afs_set_fc_call(call, fc);
        afs_make_call(&fc->ac, call, GFP_NOFS);
        return afs_wait_for_call_to_complete(call, &fc->ac);
}

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

        _enter("");

        call = afs_alloc_flat_call(net, &yfs_RXYFSExtendLock,
                                   sizeof(__be32) * 2 +
                                   sizeof(struct yfs_xdr_YFSFid),
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSVolSync));
        if (!call)
                return -ENOMEM;

        call->key = fc->key;
        call->lvnode = vnode;
        call->out_scb = scb;

        /* 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, &vnode->fid);
        yfs_check_req(call, bp);

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

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

        _enter("");

        call = afs_alloc_flat_call(net, &yfs_RXYFSReleaseLock,
                                   sizeof(__be32) * 2 +
                                   sizeof(struct yfs_xdr_YFSFid),
                                   sizeof(struct yfs_xdr_YFSFetchStatus) +
                                   sizeof(struct yfs_xdr_YFSVolSync));
        if (!call)
                return -ENOMEM;

        call->key = fc->key;
        call->lvnode = vnode;
        call->out_scb = scb;

        /* 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, &vnode->fid);
        yfs_check_req(call, bp);

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

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

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

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

        call = afs_alloc_flat_call(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) {
                fc->ac.error = -ENOMEM;
                return -ENOMEM;
        }

        call->key = fc->key;
        call->out_scb = scb;
        call->out_volsync = volsync;

        /* 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, fid);
        yfs_check_req(call, bp);

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

/*
 * Deliver reply data to an YFS.InlineBulkStatus call
 */
static int yfs_deliver_fs_inline_bulk_status(struct afs_call *call)
{
        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++;
                /* Fall through */

                /* 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, call->count2);
                if (tmp != call->count2)
                        return afs_protocol_error(call, -EBADMSG,
                                                  afs_eproto_ibulkst_count);

                call->count = 0;
                call->unmarshall++;
        more_counts:
                afs_extract_to_buf(call, sizeof(struct yfs_xdr_YFSFetchStatus));
                /* Fall through */

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

                bp = call->buffer;
                scb = &call->out_scb[call->count];
                ret = xdr_decode_YFSFetchStatus(&bp, call, scb);
                if (ret < 0)
                        return ret;

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

                call->count = 0;
                call->unmarshall++;
                afs_extract_to_tmp(call);
                /* Fall through */

                /* 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 != call->count2)
                        return afs_protocol_error(call, -EBADMSG,
                                                  afs_eproto_ibulkst_cb_count);
                call->count = 0;
                call->unmarshall++;
        more_cbs:
                afs_extract_to_buf(call, sizeof(struct yfs_xdr_YFSCallBack));
                /* Fall through */

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

                _debug("unmarshall CB array");
                bp = call->buffer;
                scb = &call->out_scb[call->count];
                xdr_decode_YFSCallBack(&bp, call, scb);
                call->count++;
                if (call->count < call->count2)
                        goto more_cbs;

                afs_extract_to_buf(call, sizeof(struct yfs_xdr_YFSVolSync));
                call->unmarshall++;
                /* Fall through */

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

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

                call->unmarshall++;
                /* Fall through */

        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
 */
int yfs_fs_inline_bulk_status(struct afs_fs_cursor *fc,
                              struct afs_net *net,
                              struct afs_fid *fids,
                              struct afs_status_cb *statuses,
                              unsigned int nr_fids,
                              struct afs_volsync *volsync)
{
        struct afs_call *call;
        __be32 *bp;
        int i;

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

        call = afs_alloc_flat_call(net, &yfs_RXYFSInlineBulkStatus,
                                   sizeof(__be32) +
                                   sizeof(__be32) +
                                   sizeof(__be32) +
                                   sizeof(struct yfs_xdr_YFSFid) * nr_fids,
                                   sizeof(struct yfs_xdr_YFSFetchStatus));
        if (!call) {
                fc->ac.error = -ENOMEM;
                return -ENOMEM;
        }

        call->key = fc->key;
        call->out_scb = statuses;
        call->out_volsync = volsync;
        call->count2 = nr_fids;

        /* marshall the parameters */
        bp = call->request;
        bp = xdr_encode_u32(bp, YFSINLINEBULKSTATUS);
        bp = xdr_encode_u32(bp, 0); /* RPCFlags */
        bp = xdr_encode_u32(bp, nr_fids);
        for (i = 0; i < nr_fids; i++)
                bp = xdr_encode_YFSFid(bp, &fids[i]);
        yfs_check_req(call, bp);

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

/*
 * Deliver reply data to an YFS.FetchOpaqueACL.
 */
static int yfs_deliver_fs_fetch_opaque_acl(struct afs_call *call)
{
        struct yfs_acl *yacl = call->out_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++;
                /* Fall through */

                /* 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++;
                /* Fall through */

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

                afs_extract_to_tmp(call);
                call->unmarshall++;
                /* Fall through */

                /* 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++;
                /* Fall through */

                /* 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++;
                /* Fall through */

                /* 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++);
                ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
                if (ret < 0)
                        return ret;
                xdr_decode_YFSVolSync(&bp, call->out_volsync);

                call->unmarshall++;
                /* Fall through */

        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.
 */
struct yfs_acl *yfs_fs_fetch_opaque_acl(struct afs_fs_cursor *fc,
                                        struct yfs_acl *yacl,
                                        struct afs_status_cb *scb)
{
        struct afs_vnode *vnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(vnode);
        __be32 *bp;

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

        call = afs_alloc_flat_call(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) {
                fc->ac.error = -ENOMEM;
                return ERR_PTR(-ENOMEM);
        }

        call->key = fc->key;
        call->out_yacl = yacl;
        call->out_scb = scb;
        call->out_volsync = NULL;

        /* 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, &vnode->fid);
        yfs_check_req(call, bp);

        afs_use_fs_server(call, fc->cbi);
        trace_afs_make_fs_call(call, &vnode->fid);
        afs_make_call(&fc->ac, call, GFP_KERNEL);
        return (struct yfs_acl *)afs_wait_for_call_to_complete(call, &fc->ac);
}

/*
 * 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.
 */
int yfs_fs_store_opaque_acl2(struct afs_fs_cursor *fc, const struct afs_acl *acl,
                             struct afs_status_cb *scb)
{
        struct afs_vnode *vnode = fc->vnode;
        struct afs_call *call;
        struct afs_net *net = afs_v2net(vnode);
        size_t size;
        __be32 *bp;

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

        size = round_up(acl->size, 4);
        call = afs_alloc_flat_call(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) {
                fc->ac.error = -ENOMEM;
                return -ENOMEM;
        }

        call->key = fc->key;
        call->out_scb = scb;
        call->out_volsync = NULL;

        /* 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, &vnode->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);
        yfs_check_req(call, bp);

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