Drivers: hv: Implement the file copy service

Implement the file copy service for Linux guests on Hyper-V. This permits the
host to copy a file (over VMBUS) into the guest. This facility is part of
"guest integration services" supported on the Windows platform.
Here is a link that provides additional details on this functionality:

http://technet.microsoft.com/en-us/library/dn464282.aspx

In V1 version of the patch I have addressed comments from
Olaf Hering <olaf@aepfle.de> and Dan Carpenter <dan.carpenter@oracle.com>

In V2 version of this patch I did some minor cleanup (making some globals
static). In V4 version of the patch I have addressed all of Olaf's
most recent set of comments/concerns.

In V5 version of the patch I had addressed Greg's most recent comments.
I would like to thank Greg for suggesting that I use misc device; it has
significantly simplified the code.

In V6 version of the patch I have cleaned up error message based on Olaf's
comments. I have also rebased the patch based on the current tip.

In this version of the patch, I have addressed the latest comments from Greg.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

7 files changed, 682 insertions, 2 deletions

diff --git a/drivers/hv/Makefile b/drivers/hv/Makefile
index 0a74b5661186..5e4dfa4cfe22 100644
--- a/drivers/hv/Makefile
+++ b/drivers/hv/Makefile
@@ -5,4 +5,4 @@ obj-$(CONFIG_HYPERV_BALLOON)	+= hv_balloon.o
 hv_vmbus-y := vmbus_drv.o \
                  hv.o connection.o channel.o \
                  channel_mgmt.o ring_buffer.o
-hv_utils-y := hv_util.o hv_kvp.o hv_snapshot.o
+hv_utils-y := hv_util.o hv_kvp.o hv_snapshot.o hv_fcopy.o
diff --git a/drivers/hv/hv_fcopy.c b/drivers/hv/hv_fcopy.c
new file mode 100644
index 000000000000..285b5e210a09
--- /dev/null
+++ b/drivers/hv/hv_fcopy.c
@@ -0,0 +1,414 @@
+/*
+ * An implementation of file copy service.
+ *
+ * Copyright (C) 2014, Microsoft, Inc.
+ *
+ * Author : K. Y. Srinivasan <ksrinivasan@novell.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT.  See the GNU General Public License for more
+ * details.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/semaphore.h>
+#include <linux/fs.h>
+#include <linux/nls.h>
+#include <linux/workqueue.h>
+#include <linux/cdev.h>
+#include <linux/hyperv.h>
+#include <linux/sched.h>
+#include <linux/uaccess.h>
+#include <linux/miscdevice.h>
+
+#include "hyperv_vmbus.h"
+
+#define WIN8_SRV_MAJOR          1
+#define WIN8_SRV_MINOR          1
+#define WIN8_SRV_VERSION        (WIN8_SRV_MAJOR << 16 | WIN8_SRV_MINOR)
+
+/*
+ * Global state maintained for transaction that is being processed.
+ * For a class of integration services, including the "file copy service",
+ * the specified protocol is a "request/response" protocol which means that
+ * there can only be single outstanding transaction from the host at any
+ * given point in time. We use this to simplify memory management in this
+ * driver - we cache and process only one message at a time.
+ *
+ * While the request/response protocol is guaranteed by the host, we further
+ * ensure this by serializing packet processing in this driver - we do not
+ * read additional packets from the VMBUs until the current packet is fully
+ * handled.
+ *
+ * The transaction "active" state is set when we receive a request from the
+ * host and we cleanup this state when the transaction is completed - when we
+ * respond to the host with our response. When the transaction active state is
+ * set, we defer handling incoming packets.
+ */
+
+static struct {
+        bool active; /* transaction status - active or not */
+        int recv_len; /* number of bytes received. */
+        struct hv_fcopy_hdr  *fcopy_msg; /* current message */
+        struct hv_start_fcopy  message; /*  sent to daemon */
+        struct vmbus_channel *recv_channel; /* chn we got the request */
+        u64 recv_req_id; /* request ID. */
+        void *fcopy_context; /* for the channel callback */
+        struct semaphore read_sema;
+} fcopy_transaction;
+
+static bool opened; /* currently device opened */
+
+/*
+ * Before we can accept copy messages from the host, we need
+ * to handshake with the user level daemon. This state tracks
+ * if we are in the handshake phase.
+ */
+static bool in_hand_shake = true;
+static void fcopy_send_data(void);
+static void fcopy_respond_to_host(int error);
+static void fcopy_work_func(struct work_struct *dummy);
+static DECLARE_DELAYED_WORK(fcopy_work, fcopy_work_func);
+static u8 *recv_buffer;
+
+static void fcopy_work_func(struct work_struct *dummy)
+{
+        /*
+         * If the timer fires, the user-mode component has not responded;
+         * process the pending transaction.
+         */
+        fcopy_respond_to_host(HV_E_FAIL);
+}
+
+static int fcopy_handle_handshake(u32 version)
+{
+        switch (version) {
+        case FCOPY_CURRENT_VERSION:
+                break;
+        default:
+                /*
+                 * For now we will fail the registration.
+                 * If and when we have multiple versions to
+                 * deal with, we will be backward compatible.
+                 * We will add this code when needed.
+                 */
+                return -EINVAL;
+        }
+        pr_info("FCP: user-mode registering done. Daemon version: %d\n",
+                version);
+        fcopy_transaction.active = false;
+        if (fcopy_transaction.fcopy_context)
+                hv_fcopy_onchannelcallback(fcopy_transaction.fcopy_context);
+        in_hand_shake = false;
+        return 0;
+}
+
+static void fcopy_send_data(void)
+{
+        struct hv_start_fcopy *smsg_out = &fcopy_transaction.message;
+        int operation = fcopy_transaction.fcopy_msg->operation;
+        struct hv_start_fcopy *smsg_in;
+
+        /*
+         * The  strings sent from the host are encoded in
+         * in utf16; convert it to utf8 strings.
+         * The host assures us that the utf16 strings will not exceed
+         * the max lengths specified. We will however, reserve room
+         * for the string terminating character - in the utf16s_utf8s()
+         * function we limit the size of the buffer where the converted
+         * string is placed to W_MAX_PATH -1 to guarantee
+         * that the strings can be properly terminated!
+         */
+
+        switch (operation) {
+        case START_FILE_COPY:
+                memset(smsg_out, 0, sizeof(struct hv_start_fcopy));
+                smsg_out->hdr.operation = operation;
+                smsg_in = (struct hv_start_fcopy *)fcopy_transaction.fcopy_msg;
+
+                utf16s_to_utf8s((wchar_t *)smsg_in->file_name, W_MAX_PATH,
+                                UTF16_LITTLE_ENDIAN,
+                                (__u8 *)smsg_out->file_name, W_MAX_PATH - 1);
+
+                utf16s_to_utf8s((wchar_t *)smsg_in->path_name, W_MAX_PATH,
+                                UTF16_LITTLE_ENDIAN,
+                                (__u8 *)smsg_out->path_name, W_MAX_PATH - 1);
+
+                smsg_out->copy_flags = smsg_in->copy_flags;
+                smsg_out->file_size = smsg_in->file_size;
+                break;
+
+        default:
+                break;
+        }
+        up(&fcopy_transaction.read_sema);
+        return;
+}
+
+/*
+ * Send a response back to the host.
+ */
+
+static void
+fcopy_respond_to_host(int error)
+{
+        struct icmsg_hdr *icmsghdr;
+        u32 buf_len;
+        struct vmbus_channel *channel;
+        u64 req_id;
+
+        /*
+         * Copy the global state for completing the transaction. Note that
+         * only one transaction can be active at a time. This is guaranteed
+         * by the file copy protocol implemented by the host. Furthermore,
+         * the "transaction active" state we maintain ensures that there can
+         * only be one active transaction at a time.
+         */
+
+        buf_len = fcopy_transaction.recv_len;
+        channel = fcopy_transaction.recv_channel;
+        req_id = fcopy_transaction.recv_req_id;
+
+        fcopy_transaction.active = false;
+
+        icmsghdr = (struct icmsg_hdr *)
+                        &recv_buffer[sizeof(struct vmbuspipe_hdr)];
+
+        if (channel->onchannel_callback == NULL)
+                /*
+                 * We have raced with util driver being unloaded;
+                 * silently return.
+                 */
+                return;
+
+        icmsghdr->status = error;
+        icmsghdr->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE;
+        vmbus_sendpacket(channel, recv_buffer, buf_len, req_id,
+                                VM_PKT_DATA_INBAND, 0);
+}
+
+void hv_fcopy_onchannelcallback(void *context)
+{
+        struct vmbus_channel *channel = context;
+        u32 recvlen;
+        u64 requestid;
+        struct hv_fcopy_hdr *fcopy_msg;
+        struct icmsg_hdr *icmsghdr;
+        struct icmsg_negotiate *negop = NULL;
+        int util_fw_version;
+        int fcopy_srv_version;
+
+        if (fcopy_transaction.active) {
+                /*
+                 * We will defer processing this callback once
+                 * the current transaction is complete.
+                 */
+                fcopy_transaction.fcopy_context = context;
+                return;
+        }
+
+        vmbus_recvpacket(channel, recv_buffer, PAGE_SIZE * 2, &recvlen,
+                         &requestid);
+        if (recvlen <= 0)
+                return;
+
+        icmsghdr = (struct icmsg_hdr *)&recv_buffer[
+                        sizeof(struct vmbuspipe_hdr)];
+        if (icmsghdr->icmsgtype == ICMSGTYPE_NEGOTIATE) {
+                util_fw_version = UTIL_FW_VERSION;
+                fcopy_srv_version = WIN8_SRV_VERSION;
+                vmbus_prep_negotiate_resp(icmsghdr, negop, recv_buffer,
+                                util_fw_version, fcopy_srv_version);
+        } else {
+                fcopy_msg = (struct hv_fcopy_hdr *)&recv_buffer[
+                                sizeof(struct vmbuspipe_hdr) +
+                                sizeof(struct icmsg_hdr)];
+
+                /*
+                 * Stash away this global state for completing the
+                 * transaction; note transactions are serialized.
+                 */
+
+                fcopy_transaction.active = true;
+                fcopy_transaction.recv_len = recvlen;
+                fcopy_transaction.recv_channel = channel;
+                fcopy_transaction.recv_req_id = requestid;
+                fcopy_transaction.fcopy_msg = fcopy_msg;
+
+                /*
+                 * Send the information to the user-level daemon.
+                 */
+                fcopy_send_data();
+                schedule_delayed_work(&fcopy_work, 5*HZ);
+                return;
+        }
+        icmsghdr->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE;
+        vmbus_sendpacket(channel, recv_buffer, recvlen, requestid,
+                        VM_PKT_DATA_INBAND, 0);
+}
+
+/*
+ * Create a char device that can support read/write for passing
+ * the payload.
+ */
+
+static ssize_t fcopy_read(struct file *file, char __user *buf,
+                size_t count, loff_t *ppos)
+{
+        void *src;
+        size_t copy_size;
+        int operation;
+
+        /*
+         * Wait until there is something to be read.
+         */
+        if (down_interruptible(&fcopy_transaction.read_sema))
+                return -EINTR;
+
+        /*
+         * The channel may be rescinded and in this case, we will wakeup the
+         * the thread blocked on the semaphore and we will use the opened
+         * state to correctly handle this case.
+         */
+        if (!opened)
+                return -ENODEV;
+
+        operation = fcopy_transaction.fcopy_msg->operation;
+
+        if (operation == START_FILE_COPY) {
+                src = &fcopy_transaction.message;
+                copy_size = sizeof(struct hv_start_fcopy);
+                if (count < copy_size)
+                        return 0;
+        } else {
+                src = fcopy_transaction.fcopy_msg;
+                copy_size = sizeof(struct hv_do_fcopy);
+                if (count < copy_size)
+                        return 0;
+        }
+        if (copy_to_user(buf, src, copy_size))
+                return -EFAULT;
+
+        return copy_size;
+}
+
+static ssize_t fcopy_write(struct file *file, const char __user *buf,
+                        size_t count, loff_t *ppos)
+{
+        int response = 0;
+
+        if (count != sizeof(int))
+                return -EINVAL;
+
+        if (copy_from_user(&response, buf, sizeof(int)))
+                return -EFAULT;
+
+        if (in_hand_shake) {
+                if (fcopy_handle_handshake(response))
+                        return -EINVAL;
+                return sizeof(int);
+        }
+
+        /*
+         * Complete the transaction by forwarding the result
+         * to the host. But first, cancel the timeout.
+         */
+        if (cancel_delayed_work_sync(&fcopy_work))
+                fcopy_respond_to_host(response);
+
+        return sizeof(int);
+}
+
+int fcopy_open(struct inode *inode, struct file *f)
+{
+        /*
+         * The user level daemon that will open this device is
+         * really an extension of this driver. We can have only
+         * active open at a time.
+         */
+        if (opened)
+                return -EBUSY;
+
+        /*
+         * The daemon is alive; setup the state.
+         */
+        opened = true;
+        return 0;
+}
+
+int fcopy_release(struct inode *inode, struct file *f)
+{
+        /*
+         * The daemon has exited; reset the state.
+         */
+        in_hand_shake = true;
+        opened = false;
+        return 0;
+}
+
+
+static const struct file_operations fcopy_fops = {
+        .read           = fcopy_read,
+        .write          = fcopy_write,
+        .release        = fcopy_release,
+        .open           = fcopy_open,
+};
+
+static struct miscdevice fcopy_misc = {
+        .minor          = MISC_DYNAMIC_MINOR,
+        .name           = "vmbus/hv_fcopy",
+        .fops           = &fcopy_fops,
+};
+
+static int fcopy_dev_init(void)
+{
+        return misc_register(&fcopy_misc);
+}
+
+static void fcopy_dev_deinit(void)
+{
+
+        /*
+         * The device is going away - perhaps because the
+         * host has rescinded the channel. Setup state so that
+         * user level daemon can gracefully exit if it is blocked
+         * on the read semaphore.
+         */
+        opened = false;
+        /*
+         * Signal the semaphore as the device is
+         * going away.
+         */
+        up(&fcopy_transaction.read_sema);
+        misc_deregister(&fcopy_misc);
+}
+
+int hv_fcopy_init(struct hv_util_service *srv)
+{
+        recv_buffer = srv->recv_buffer;
+
+        /*
+         * When this driver loads, the user level daemon that
+         * processes the host requests may not yet be running.
+         * Defer processing channel callbacks until the daemon
+         * has registered.
+         */
+        fcopy_transaction.active = true;
+        sema_init(&fcopy_transaction.read_sema, 0);
+
+        return fcopy_dev_init();
+}
+
+void hv_fcopy_deinit(void)
+{
+        cancel_delayed_work_sync(&fcopy_work);
+        fcopy_dev_deinit();
+}
diff --git a/drivers/hv/hv_util.c b/drivers/hv/hv_util.c
index 62dfd246b948..dd761806f0e8 100644
--- a/drivers/hv/hv_util.c
+++ b/drivers/hv/hv_util.c
@@ -28,6 +28,7 @@
 #include <linux/reboot.h>
 #include <linux/hyperv.h>
 
+#include "hyperv_vmbus.h"
 
 #define SD_MAJOR        3
 #define SD_MINOR        0
@@ -82,6 +83,12 @@ static struct hv_util_service util_vss = {
         .util_deinit = hv_vss_deinit,
 };
 
+static struct hv_util_service util_fcopy = {
+        .util_cb = hv_fcopy_onchannelcallback,
+        .util_init = hv_fcopy_init,
+        .util_deinit = hv_fcopy_deinit,
+};
+
 static void perform_shutdown(struct work_struct *dummy)
 {
         orderly_poweroff(true);
@@ -401,6 +408,10 @@ static const struct hv_vmbus_device_id id_table[] = {
         { HV_VSS_GUID,
           .driver_data = (unsigned long)&util_vss
         },
+        /* File copy GUID */
+        { HV_FCOPY_GUID,
+          .driver_data = (unsigned long)&util_fcopy
+        },
         { },
 };
 
diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
index 1544609881fe..860134da8039 100644
--- a/drivers/hv/hyperv_vmbus.h
+++ b/drivers/hv/hyperv_vmbus.h
@@ -669,5 +669,9 @@ int vmbus_set_event(struct vmbus_channel *channel);
 
 void vmbus_on_event(unsigned long data);
 
+int hv_fcopy_init(struct hv_util_service *);
+void hv_fcopy_deinit(void);
+void hv_fcopy_onchannelcallback(void *);
+
 
 #endif /* _HYPERV_VMBUS_H */
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index fb66fba368d7..62ea1a06836a 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -30,7 +30,6 @@
 #include <linux/types.h>
 #include <linux/scatterlist.h>
 #include <linux/list.h>
-#include <linux/uuid.h>
 #include <linux/timer.h>
 #include <linux/workqueue.h>
 #include <linux/completion.h>
@@ -1050,6 +1049,17 @@ void vmbus_driver_unregister(struct hv_driver *hv_driver);
                 }
 
 /*
+ * Guest File Copy Service
+ * {34D14BE3-DEE4-41c8-9AE7-6B174977C192}
+ */
+
+#define HV_FCOPY_GUID \
+        .guid = { \
+                        0xE3, 0x4B, 0xD1, 0x34, 0xE4, 0xDE, 0xC8, 0x41, \
+                        0x9A, 0xE7, 0x6B, 0x17, 0x49, 0x77, 0xC1, 0x92 \
+                }
+
+/*
  * Common header for Hyper-V ICs
  */
 
diff --git a/include/uapi/linux/hyperv.h b/include/uapi/linux/hyperv.h
index 1861f8e2ce2b..9beb7c991638 100644
--- a/include/uapi/linux/hyperv.h
+++ b/include/uapi/linux/hyperv.h
@@ -25,6 +25,8 @@
 #ifndef _UAPI_HYPERV_H
 #define _UAPI_HYPERV_H
 
+#include <linux/uuid.h>
+
 /*
  * Framework version for util services.
  */
@@ -94,6 +96,50 @@ struct hv_vss_msg {
 } __attribute__((packed));
 
 /*
+ * Implementation of a host to guest copy facility.
+ */
+
+#define FCOPY_VERSION_0 0
+#define FCOPY_CURRENT_VERSION FCOPY_VERSION_0
+#define W_MAX_PATH 260
+
+enum hv_fcopy_op {
+        START_FILE_COPY = 0,
+        WRITE_TO_FILE,
+        COMPLETE_FCOPY,
+        CANCEL_FCOPY,
+};
+
+struct hv_fcopy_hdr {
+        __u32 operation;
+        uuid_le service_id0; /* currently unused */
+        uuid_le service_id1; /* currently unused */
+} __attribute__((packed));
+
+#define OVER_WRITE      0x1
+#define CREATE_PATH     0x2
+
+struct hv_start_fcopy {
+        struct hv_fcopy_hdr hdr;
+        __u16 file_name[W_MAX_PATH];
+        __u16 path_name[W_MAX_PATH];
+        __u32 copy_flags;
+        __u64 file_size;
+} __attribute__((packed));
+
+/*
+ * The file is chunked into fragments.
+ */
+#define DATA_FRAGMENT   (6 * 1024)
+
+struct hv_do_fcopy {
+        struct hv_fcopy_hdr hdr;
+        __u64   offset;
+        __u32   size;
+        __u8    data[DATA_FRAGMENT];
+};
+
+/*
  * An implementation of HyperV key value pair (KVP) functionality for Linux.
  *
  *
diff --git a/tools/hv/hv_fcopy_daemon.c b/tools/hv/hv_fcopy_daemon.c
new file mode 100644
index 000000000000..4ecc4fd0bc1b
--- /dev/null
+++ b/tools/hv/hv_fcopy_daemon.c
@@ -0,0 +1,195 @@
+/*
+ * An implementation of host to guest copy functionality for Linux.
+ *
+ * Copyright (C) 2014, Microsoft, Inc.
+ *
+ * Author : K. Y. Srinivasan <kys@microsoft.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT.  See the GNU General Public License for more
+ * details.
+ */
+
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/poll.h>
+#include <linux/types.h>
+#include <linux/kdev_t.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <ctype.h>
+#include <errno.h>
+#include <linux/hyperv.h>
+#include <syslog.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <dirent.h>
+
+static int target_fd;
+static char target_fname[W_MAX_PATH];
+
+static int hv_start_fcopy(struct hv_start_fcopy *smsg)
+{
+        int error = HV_E_FAIL;
+        char *q, *p;
+
+        /*
+         * If possile append a path seperator to the path.
+         */
+        if (strlen((char *)smsg->path_name) < (W_MAX_PATH - 2))
+                strcat((char *)smsg->path_name, "/");
+
+        p = (char *)smsg->path_name;
+        snprintf(target_fname, sizeof(target_fname), "%s/%s",
+                (char *)smsg->path_name, smsg->file_name);
+
+        syslog(LOG_INFO, "Target file name: %s", target_fname);
+        /*
+         * Check to see if the path is already in place; if not,
+         * create if required.
+         */
+        while ((q = strchr(p, '/')) != NULL) {
+                if (q == p) {
+                        p++;
+                        continue;
+                }
+                *q = '\0';
+                if (access((char *)smsg->path_name, F_OK)) {
+                        if (smsg->copy_flags & CREATE_PATH) {
+                                if (mkdir((char *)smsg->path_name, 0755)) {
+                                        syslog(LOG_ERR, "Failed to create %s",
+                                                (char *)smsg->path_name);
+                                        goto done;
+                                }
+                        } else {
+                                syslog(LOG_ERR, "Invalid path: %s",
+                                        (char *)smsg->path_name);
+                                goto done;
+                        }
+                }
+                p = q + 1;
+                *q = '/';
+        }
+
+        if (!access(target_fname, F_OK)) {
+                syslog(LOG_INFO, "File: %s exists", target_fname);
+                if (!smsg->copy_flags & OVER_WRITE)
+                        goto done;
+        }
+
+        target_fd = open(target_fname, O_RDWR | O_CREAT | O_CLOEXEC, 0744);
+        if (target_fd == -1) {
+                syslog(LOG_INFO, "Open Failed: %s", strerror(errno));
+                goto done;
+        }
+
+        error = 0;
+done:
+        return error;
+}
+
+static int hv_copy_data(struct hv_do_fcopy *cpmsg)
+{
+        ssize_t bytes_written;
+
+        bytes_written = pwrite(target_fd, cpmsg->data, cpmsg->size,
+                                cpmsg->offset);
+
+        if (bytes_written != cpmsg->size)
+                return HV_E_FAIL;
+
+        return 0;
+}
+
+static int hv_copy_finished(void)
+{
+        close(target_fd);
+        return 0;
+}
+static int hv_copy_cancel(void)
+{
+        close(target_fd);
+        unlink(target_fname);
+        return 0;
+
+}
+
+int main(void)
+{
+        int fd, fcopy_fd, len;
+        int error;
+        int version = FCOPY_CURRENT_VERSION;
+        char *buffer[4096 * 2];
+        struct hv_fcopy_hdr *in_msg;
+
+        if (daemon(1, 0)) {
+                syslog(LOG_ERR, "daemon() failed; error: %s", strerror(errno));
+                exit(EXIT_FAILURE);
+        }
+
+        openlog("HV_FCOPY", 0, LOG_USER);
+        syslog(LOG_INFO, "HV_FCOPY starting; pid is:%d", getpid());
+
+        fcopy_fd = open("/dev/vmbus/hv_fcopy", O_RDWR);
+
+        if (fcopy_fd < 0) {
+                syslog(LOG_ERR, "open /dev/vmbus/hv_fcopy failed; error: %d %s",
+                        errno, strerror(errno));
+                exit(EXIT_FAILURE);
+        }
+
+        /*
+         * Register with the kernel.
+         */
+        if ((write(fcopy_fd, &version, sizeof(int))) != sizeof(int)) {
+                syslog(LOG_ERR, "Registration failed: %s", strerror(errno));
+                exit(EXIT_FAILURE);
+        }
+
+        while (1) {
+                /*
+                 * In this loop we process fcopy messages after the
+                 * handshake is complete.
+                 */
+                len = pread(fcopy_fd, buffer, (4096 * 2), 0);
+                if (len < 0) {
+                        syslog(LOG_ERR, "pread failed: %s", strerror(errno));
+                        exit(EXIT_FAILURE);
+                }
+                in_msg = (struct hv_fcopy_hdr *)buffer;
+
+                switch (in_msg->operation) {
+                case START_FILE_COPY:
+                        error = hv_start_fcopy((struct hv_start_fcopy *)in_msg);
+                        break;
+                case WRITE_TO_FILE:
+                        error = hv_copy_data((struct hv_do_fcopy *)in_msg);
+                        break;
+                case COMPLETE_FCOPY:
+                        error = hv_copy_finished();
+                        break;
+                case CANCEL_FCOPY:
+                        error = hv_copy_cancel();
+                        break;
+
+                default:
+                        syslog(LOG_ERR, "Unknown operation: %d",
+                                in_msg->operation);
+
+                }
+
+                if (pwrite(fcopy_fd, &error, sizeof(int), 0) != sizeof(int)) {
+                        syslog(LOG_ERR, "pwrite failed: %s", strerror(errno));
+                        exit(EXIT_FAILURE);
+                }
+        }
+}