From 3eb2094c59e89db2bedd401e23c7a870081c9edb Mon Sep 17 00:00:00 2001 From: Bjarke Istrup Pedersen Date: Sun, 9 Feb 2014 11:41:52 +0000 Subject: Adding makefile for tools/hv Currently, there is no makefile for the Hyper-V tools. This patch adds the missing makefile, and adds it to the main tools makefile. Signed-off-by: Bjarke Istrup Pedersen Signed-off-by: Greg Kroah-Hartman --- tools/Makefile | 11 ++++++----- tools/hv/Makefile | 13 +++++++++++++ 2 files changed, 19 insertions(+), 5 deletions(-) create mode 100644 tools/hv/Makefile (limited to 'tools') diff --git a/tools/Makefile b/tools/Makefile index feec3ad5fd09..bcae806b0c39 100644 --- a/tools/Makefile +++ b/tools/Makefile @@ -7,6 +7,7 @@ help: @echo ' cgroup - cgroup tools' @echo ' cpupower - a tool for all things x86 CPU power' @echo ' firewire - the userspace part of nosy, an IEEE-1394 traffic sniffer' + @echo ' hv - tools used when in Hyper-V clients' @echo ' lguest - a minimal 32-bit x86 hypervisor' @echo ' perf - Linux performance measurement and analysis tool' @echo ' selftests - various kernel selftests' @@ -40,7 +41,7 @@ acpi: FORCE cpupower: FORCE $(call descend,power/$@) -cgroup firewire guest usb virtio vm net: FORCE +cgroup firewire hv guest usb virtio vm net: FORCE $(call descend,$@) libapikfs: FORCE @@ -64,7 +65,7 @@ acpi_install: cpupower_install: $(call descend,power/$(@:_install=),install) -cgroup_install firewire_install lguest_install perf_install usb_install virtio_install vm_install net_install: +cgroup_install firewire_install hv_install lguest_install perf_install usb_install virtio_install vm_install net_install: $(call descend,$(@:_install=),install) selftests_install: @@ -76,7 +77,7 @@ turbostat_install x86_energy_perf_policy_install: tmon_install: $(call descend,thermal/$(@:_install=),install) -install: acpi_install cgroup_install cpupower_install firewire_install lguest_install \ +install: acpi_install cgroup_install cpupower_install hv_install firewire_install lguest_install \ perf_install selftests_install turbostat_install usb_install \ virtio_install vm_install net_install x86_energy_perf_policy_install \ tmon @@ -87,7 +88,7 @@ acpi_clean: cpupower_clean: $(call descend,power/cpupower,clean) -cgroup_clean firewire_clean lguest_clean usb_clean virtio_clean vm_clean net_clean: +cgroup_clean hv_clean firewire_clean lguest_clean usb_clean virtio_clean vm_clean net_clean: $(call descend,$(@:_clean=),clean) libapikfs_clean: @@ -105,7 +106,7 @@ turbostat_clean x86_energy_perf_policy_clean: tmon_clean: $(call descend,thermal/tmon,clean) -clean: acpi_clean cgroup_clean cpupower_clean firewire_clean lguest_clean \ +clean: acpi_clean cgroup_clean cpupower_clean hv_clean firewire_clean lguest_clean \ perf_clean selftests_clean turbostat_clean usb_clean virtio_clean \ vm_clean net_clean x86_energy_perf_policy_clean tmon_clean diff --git a/tools/hv/Makefile b/tools/hv/Makefile new file mode 100644 index 000000000000..bd22f786a60c --- /dev/null +++ b/tools/hv/Makefile @@ -0,0 +1,13 @@ +# Makefile for Hyper-V tools + +CC = $(CROSS_COMPILE)gcc +PTHREAD_LIBS = -lpthread +WARNINGS = -Wall -Wextra +CFLAGS = $(WARNINGS) -g $(PTHREAD_LIBS) + +all: hv_kvp_daemon hv_vss_daemon +%: %.c + $(CC) $(CFLAGS) -o $@ $^ + +clean: + $(RM) hv_kvp_daemon hv_vss_daemon -- cgit v1.2.3 From f33b215549938f89aebf862b942366d2aa41c191 Mon Sep 17 00:00:00 2001 From: K. Y. Srinivasan Date: Wed, 12 Feb 2014 08:40:22 -0800 Subject: Tools: hv: vssdaemon: Ignore VFAT mounts during the Freeze operation If the guest has a FAT file system mounted, skip it during the FREEZE operation. With this change we can support host initiated backup of the guest even when the guest may have FAT file systems mounted. Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman --- tools/hv/hv_vss_daemon.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'tools') diff --git a/tools/hv/hv_vss_daemon.c b/tools/hv/hv_vss_daemon.c index 520de3304571..6a213b8cd7b9 100644 --- a/tools/hv/hv_vss_daemon.c +++ b/tools/hv/hv_vss_daemon.c @@ -87,6 +87,8 @@ static int vss_operate(int operation) continue; if (strcmp(ent->mnt_type, "iso9660") == 0) continue; + if (strcmp(ent->mnt_type, "vfat") == 0) + continue; if (strcmp(ent->mnt_dir, "/") == 0) { root_seen = 1; continue; -- cgit v1.2.3 From 01325476d6e46185031be4a9bc6443832dbc807c Mon Sep 17 00:00:00 2001 From: K. Y. Srinivasan Date: Sun, 16 Feb 2014 11:34:30 -0800 Subject: 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 and Dan Carpenter 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 Signed-off-by: Greg Kroah-Hartman --- drivers/hv/Makefile | 2 +- drivers/hv/hv_fcopy.c | 414 ++++++++++++++++++++++++++++++++++++++++++++ drivers/hv/hv_util.c | 11 ++ drivers/hv/hyperv_vmbus.h | 4 + include/linux/hyperv.h | 12 +- include/uapi/linux/hyperv.h | 46 +++++ tools/hv/hv_fcopy_daemon.c | 195 +++++++++++++++++++++ 7 files changed, 682 insertions(+), 2 deletions(-) create mode 100644 drivers/hv/hv_fcopy.c create mode 100644 tools/hv/hv_fcopy_daemon.c (limited to 'tools') 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 + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include + +#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 #include +#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 #include #include -#include #include #include #include @@ -1049,6 +1048,17 @@ void vmbus_driver_unregister(struct hv_driver *hv_driver); 0xB7, 0x6B, 0x6F, 0xD0, 0xBE, 0x52, 0x8C, 0xDA \ } +/* + * 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 + /* * Framework version for util services. */ @@ -93,6 +95,50 @@ 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 + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +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); + } + } +} -- cgit v1.2.3