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 this version of the patch I have addressed comments from
Olaf Hering <o...@aepfle.de> and Dan Carpenter <dan.carpen...@oracle.com>

Signed-off-by: K. Y. Srinivasan <k...@microsoft.com>
---
 drivers/hv/Makefile        |    2 +-
 drivers/hv/hv_fcopy.c      |  422 ++++++++++++++++++++++++++++++++++++++++++++
 drivers/hv/hv_util.c       |   10 +
 include/linux/hyperv.h     |   60 +++++++
 tools/hv/hv_fcopy_daemon.c |  173 ++++++++++++++++++
 5 files changed, 666 insertions(+), 1 deletions(-)
 create mode 100644 drivers/hv/hv_fcopy.c
 create mode 100644 tools/hv/hv_fcopy_daemon.c

diff --git a/drivers/hv/Makefile b/drivers/hv/Makefile
index 0a74b56..5e4dfa4 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 0000000..06484b4
--- /dev/null
+++ b/drivers/hv/hv_fcopy.c
@@ -0,0 +1,422 @@
+/*
+ * An implementation of file copy service.
+ *
+ * Copyright (C) 2014, Microsoft, Inc.
+ *
+ * Author : K. Y. Srinivasan <ksriniva...@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>
+
+#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 dev_t fcopy_dev;
+static bool daemon_died;
+static bool opened; /* currently device opened */
+static struct task_struct *dtp; /* daemon task ptr */
+
+/*
+ * 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 void fcopy_handle_handshake(void)
+{
+       pr_info("FCP: user-mode registering done.\n");
+       fcopy_transaction.active = false;
+       if (fcopy_transaction.fcopy_context)
+               hv_fcopy_onchannelcallback(fcopy_transaction.fcopy_context);
+       in_hand_shake = false;
+       return;
+}
+
+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 gaurantee
+        * 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 *icmsghdrp;
+       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.
+        */
+
+       buf_len = fcopy_transaction.recv_len;
+       channel = fcopy_transaction.recv_channel;
+       req_id = fcopy_transaction.recv_req_id;
+
+       fcopy_transaction.active = false;
+
+       icmsghdrp = (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;
+
+       icmsghdrp->status = error;
+       icmsghdrp->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 *icmsghdrp;
+       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;
+
+       icmsghdrp = (struct icmsg_hdr *)&recv_buffer[
+                       sizeof(struct vmbuspipe_hdr)];
+       if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
+               util_fw_version = UTIL_FW_VERSION;
+               fcopy_srv_version = WIN8_SRV_VERSION;
+               vmbus_prep_negotiate_resp(icmsghdrp, 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;
+       }
+       icmsghdrp->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.
+ */
+struct cdev fcopy_cdev;
+struct class *cl;
+struct device *sysfs_dev;
+
+static ssize_t fcopy_read(struct file *file, char __user *buf,
+               size_t count, loff_t *ppos)
+{
+       int ret;
+       void *src;
+       size_t copy_size;
+       int operation;
+
+       /*
+        * Wait until there is something to be read.
+        */
+       ret = down_interruptible(&fcopy_transaction.read_sema);
+       if (ret)
+               return -EINTR;
+
+       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 error = 0;
+
+       if (count != sizeof(int))
+               return 0;
+
+       if (copy_from_user(&error, buf, sizeof(int)))
+               return -EFAULT;
+
+       if (in_hand_shake) {
+               fcopy_handle_handshake();
+               return 0;
+       }
+
+       /*
+        * 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(error);
+
+       return sizeof(int);
+}
+
+int fcopy_open(struct inode *inode, struct file *f)
+{
+       if (opened)
+               return -EBUSY;
+
+       /*
+        * The daemon is alive; setup the state.
+        */
+       daemon_died = false;
+       opened = true;
+       dtp = current;
+       return 0;
+}
+
+int fcopy_release(struct inode *inode, struct file *f)
+{
+       /*
+        * The daemon has exited; reset the state.
+        */
+       daemon_died = true;
+       in_hand_shake = true;
+       dtp = NULL;
+       opened = false;
+       return 0;
+}
+
+
+static const struct file_operations fcopy_fops = {
+       .read           = fcopy_read,
+       .write          = fcopy_write,
+       .release        = fcopy_release,
+       .open           = fcopy_open,
+};
+
+static int fcopy_dev_init(void)
+{
+       int result;
+
+       result = alloc_chrdev_region(&fcopy_dev, 1, 1, "hv_fcopy");
+       if (result < 0) {
+               pr_err("Cannot get major number\n");
+               return result;
+       }
+
+       cl = class_create(THIS_MODULE, "chardev");
+       if (IS_ERR(cl)) {
+               pr_err("Error creating fcopy class.\n");
+               result = PTR_ERR(cl);
+               goto err_unregister;
+       }
+
+       sysfs_dev = device_create(cl, NULL, fcopy_dev, "%s", "hv_fcopy");
+       if (IS_ERR(sysfs_dev)) {
+               pr_err("Device creation failed\n");
+               result = PTR_ERR(cl);
+               goto err_destroy_class;
+       }
+
+       cdev_init(&fcopy_cdev, &fcopy_fops);
+       fcopy_cdev.owner = THIS_MODULE;
+       fcopy_cdev.ops = &fcopy_fops;
+
+       result = cdev_add(&fcopy_cdev, fcopy_dev, 1);
+       if (result) {
+               pr_err("Cannot cdev_add\n");
+               goto err_destroy_device;
+       }
+       return result;
+
+err_destroy_device:
+       device_destroy(cl, fcopy_dev);
+err_destroy_class:
+       class_destroy(cl);
+err_unregister:
+       unregister_chrdev_region(fcopy_dev, 1);
+       return result;
+}
+
+static void fcopy_dev_deinit(void)
+{
+       /*
+        * first kill the daemon.
+        */
+       if (dtp != NULL)
+               send_sig(SIGKILL, dtp, 0);
+       opened = false;
+       device_destroy(cl, fcopy_dev);
+       class_destroy(cl);
+       cdev_del(&fcopy_cdev);
+       unregister_chrdev_region(fcopy_dev, 1);
+}
+
+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 62dfd246..efc5e83 100644
--- a/drivers/hv/hv_util.c
+++ b/drivers/hv/hv_util.c
@@ -82,6 +82,12 @@ 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 +407,10 @@ 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/include/linux/hyperv.h b/include/linux/hyperv.h
index 15da677..e573ae9 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -26,6 +26,8 @@
 #define _HYPERV_H
 
 #include <linux/types.h>
+#include <linux/uuid.h>
+#include <linux/limits.h>
 
 /*
  * Framework version for util services.
@@ -96,6 +98,49 @@ struct hv_vss_msg {
 } __attribute__((packed));
 
 /*
+ * Implementation of a host to guest copy facility.
+ */
+
+#define W_MAX_PATH 260
+
+enum hv_fcopy_op {
+       START_FILE_COPY = 0,
+       WRITE_TO_FILE,
+       COMPLETE_FCOPY,
+       CANCEL_FCOPY,
+};
+
+struct hv_fcopy_hdr {
+       enum hv_fcopy_op 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.
  *
  *
@@ -1352,6 +1397,17 @@ 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
  */
 
@@ -1459,6 +1515,10 @@ int hv_vss_init(struct hv_util_service *);
 void hv_vss_deinit(void);
 void hv_vss_onchannelcallback(void *);
 
+int hv_fcopy_init(struct hv_util_service *);
+void hv_fcopy_deinit(void);
+void hv_fcopy_onchannelcallback(void *);
+
 /*
  * Negotiated version with the Host.
  */
diff --git a/tools/hv/hv_fcopy_daemon.c b/tools/hv/hv_fcopy_daemon.c
new file mode 100644
index 0000000..4b73ce6
--- /dev/null
+++ b/tools/hv/hv_fcopy_daemon.c
@@ -0,0 +1,173 @@
+/*
+ * An implementation of host to guest copy functionality for Linux.
+ *
+ * Copyright (C) 2014, Microsoft, Inc.
+ *
+ * Author : K. Y. Srinivasan <k...@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;
+char target_fname[W_MAX_PATH];
+
+static int hv_start_fcopy(struct hv_start_fcopy *smsg)
+{
+       int error = HV_E_FAIL;
+
+       sprintf(target_fname, "%s%s%s", smsg->path_name, "/",
+               smsg->file_name);
+
+       syslog(LOG_INFO, "Target file name: %s\n", target_fname);
+       /*
+        * Check to see if the path is already in place; if not,
+        * create if required.
+        */
+       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'; error: %d %s\n",
+                                       smsg->path_name,
+                                       errno, strerror(errno));
+                               goto done;
+                       }
+               } else {
+                       syslog(LOG_ERR, "Invalid path: %s\n", smsg->path_name);
+                       goto done;
+               }
+       }
+
+       if (!access(target_fname, F_OK)) {
+               syslog(LOG_INFO, "File: %s exists\n", 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\n", 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 = 0;
+       int version = 0;
+       char *buffer[4096 * 2];
+       struct hv_fcopy_hdr *in_msg;
+
+       daemon(1, 0);
+       openlog("HV_FCOPY", 0, LOG_USER);
+       syslog(LOG_INFO, "HV_FCOPY starting; pid is:%d", getpid());
+
+       fcopy_fd = open("/dev/hv_fcopy", O_RDWR);
+
+       if (fcopy_fd < 0) {
+               syslog(LOG_ERR, "open /dev/hv_fcopy failed; error: %d %s",
+                       errno, strerror(errno));
+               exit(EXIT_FAILURE);
+       }
+
+       /*
+        * Register with the kernel.
+        */
+       write(fcopy_fd, &version, sizeof(int));
+
+       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) {
+                       if (!error) {
+                               syslog(LOG_ERR, "Read error: %s\n", 
strerror(errno));
+                               error = HV_E_FAIL;
+                       }
+                       continue;
+               }
+               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\n",
+                               in_msg->operation);
+
+               }
+
+               pwrite(fcopy_fd, &error, sizeof(int), 0);
+       }
+}
-- 
1.7.4.1

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