static void v9fs_xattrwalk(void *opaque)
{
    int64_t size;
    V9fsString name;
    ssize_t err = 0;
    size_t offset = 7;
    int32_t fid, newfid;
    V9fsFidState *file_fidp;
    V9fsFidState *xattr_fidp = NULL;
    V9fsPDU *pdu = opaque;
    V9fsState *s = pdu->s;
    pdu_unmarshal(pdu, offset, "dds", &fid, &newfid, &name);
    file_fidp = get_fid(pdu, fid);
    if (file_fidp == NULL) {
        err = -ENOENT;
        goto out_nofid;
    }
    xattr_fidp = alloc_fid(s, newfid);
    if (xattr_fidp == NULL) {
        err = -EINVAL;
        goto out;
    }
    v9fs_path_copy(&xattr_fidp->path, &file_fidp->path);
    if (name.data[0] == 0) {
        /*
         * listxattr request. Get the size first
         */
        size = v9fs_co_llistxattr(pdu, &xattr_fidp->path, NULL, 0);
        if (size < 0) {
            err = size;
            clunk_fid(s, xattr_fidp->fid);
            goto out;
        }
        /*
         * Read the xattr value
         */
        xattr_fidp->fs.xattr.len = size;
        xattr_fidp->fid_type = P9_FID_XATTR;
        xattr_fidp->fs.xattr.copied_len = -1;
        if (size) {
            xattr_fidp->fs.xattr.value = g_malloc(size);
            err = v9fs_co_llistxattr(pdu, &xattr_fidp->path,
                                     xattr_fidp->fs.xattr.value,
                                     xattr_fidp->fs.xattr.len);
            if (err < 0) {
                clunk_fid(s, xattr_fidp->fid);
                goto out;
            }
        }
        offset += pdu_marshal(pdu, offset, "q", size);
        err = offset;
    } else {
        /*
         * specific xattr fid. We check for xattr
         * presence also collect the xattr size
         */
        size = v9fs_co_lgetxattr(pdu, &xattr_fidp->path,
                                 &name, NULL, 0);
        if (size < 0) {
            err = size;
            clunk_fid(s, xattr_fidp->fid);
            goto out;
        }
        /*
         * Read the xattr value
         */
        xattr_fidp->fs.xattr.len = size;
        xattr_fidp->fid_type = P9_FID_XATTR;
        xattr_fidp->fs.xattr.copied_len = -1;
        if (size) {
            xattr_fidp->fs.xattr.value = g_malloc(size);
            err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path,
                                    &name, xattr_fidp->fs.xattr.value,
                                    xattr_fidp->fs.xattr.len);
            if (err < 0) {
                clunk_fid(s, xattr_fidp->fid);
                goto out;
            }
        }
        offset += pdu_marshal(pdu, offset, "q", size);
        err = offset;
    }
out:
    put_fid(pdu, file_fidp);
    if (xattr_fidp) {
        put_fid(pdu, xattr_fidp);
    }
out_nofid:
    trace_v9fs_xattrwalk_return(pdu->tag, pdu->id, size);
    complete_pdu(s, pdu, err);
    v9fs_string_free(&name);
}