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Drivers: hv: Remove fcopy driver

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As the new fcopy driver using uio is introduced, remove obsolete driver
and application.

Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
Reviewed-by: Long Li <longli@microsoft.com>
Link: https://lore.kernel.org/r/1711788723-8593-7-git-send-email-ssengar@linux.microsoft.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Saurabh Sengar 2024-03-30 01:52:02 -07:00 committed by Greg Kroah-Hartman
parent 82b0945ce2
commit ec314f61e4
4 changed files with 1 additions and 706 deletions
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2
drivers/hv/Makefile
View file

@ -10,7 +10,7 @@ hv_vmbus-y := vmbus_drv.o \
hv.o connection.o channel.o \
channel_mgmt.o ring_buffer.o hv_trace.o
hv_vmbus-$(CONFIG_HYPERV_TESTING) += hv_debugfs.o
hv_utils-y := hv_util.o hv_kvp.o hv_snapshot.o hv_fcopy.o hv_utils_transport.o
hv_utils-y := hv_util.o hv_kvp.o hv_snapshot.o hv_utils_transport.o
# Code that must be built-in
obj-$(subst m,y,$(CONFIG_HYPERV)) += hv_common.o

427
drivers/hv/hv_fcopy.c
View file

@ -1,427 +0,0 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* An implementation of file copy service.
*
* Copyright (C) 2014, Microsoft, Inc.
*
* Author : K. Y. Srinivasan <ksrinivasan@novell.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/nls.h>
#include <linux/workqueue.h>
#include <linux/hyperv.h>
#include <linux/sched.h>
#include <asm/hyperv-tlfs.h>
#include "hyperv_vmbus.h"
#include "hv_utils_transport.h"
#define WIN8_SRV_MAJOR 1
#define WIN8_SRV_MINOR 1
#define WIN8_SRV_VERSION (WIN8_SRV_MAJOR << 16 | WIN8_SRV_MINOR)
#define FCOPY_VER_COUNT 1
static const int fcopy_versions[] = {
WIN8_SRV_VERSION
};
#define FW_VER_COUNT 1
static const int fw_versions[] = {
UTIL_FW_VERSION
};
/*
* 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.
*/
static struct {
int state; /* hvutil_device_state */
int recv_len; /* number of bytes received. */
struct hv_fcopy_hdr *fcopy_msg; /* current message */
struct vmbus_channel *recv_channel; /* chn we got the request */
u64 recv_req_id; /* request ID. */
} fcopy_transaction;
static void fcopy_respond_to_host(int error);
static void fcopy_send_data(struct work_struct *dummy);
static void fcopy_timeout_func(struct work_struct *dummy);
static DECLARE_DELAYED_WORK(fcopy_timeout_work, fcopy_timeout_func);
static DECLARE_WORK(fcopy_send_work, fcopy_send_data);
static const char fcopy_devname[] = "vmbus/hv_fcopy";
static u8 *recv_buffer;
static struct hvutil_transport *hvt;
/*
* This state maintains the version number registered by the daemon.
*/
static int dm_reg_value;
static void fcopy_poll_wrapper(void *channel)
{
/* Transaction is finished, reset the state here to avoid races. */
fcopy_transaction.state = HVUTIL_READY;
tasklet_schedule(&((struct vmbus_channel *)channel)->callback_event);
}
static void fcopy_timeout_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);
hv_poll_channel(fcopy_transaction.recv_channel, fcopy_poll_wrapper);
}
static void fcopy_register_done(void)
{
pr_debug("FCP: userspace daemon registered\n");
hv_poll_channel(fcopy_transaction.recv_channel, fcopy_poll_wrapper);
}
static int fcopy_handle_handshake(u32 version)
{
u32 our_ver = FCOPY_CURRENT_VERSION;
switch (version) {
case FCOPY_VERSION_0:
/* Daemon doesn't expect us to reply */
dm_reg_value = version;
break;
case FCOPY_VERSION_1:
/* Daemon expects us to reply with our own version */
if (hvutil_transport_send(hvt, &our_ver, sizeof(our_ver),
fcopy_register_done))
return -EFAULT;
dm_reg_value = 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_debug("FCP: userspace daemon ver. %d connected\n", version);
return 0;
}
static void fcopy_send_data(struct work_struct *dummy)
{
struct hv_start_fcopy *smsg_out = NULL;
int operation = fcopy_transaction.fcopy_msg->operation;
struct hv_start_fcopy *smsg_in;
void *out_src;
int rc, out_len;
/*
* The strings sent from the host are encoded 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:
out_len = sizeof(struct hv_start_fcopy);
smsg_out = kzalloc(sizeof(*smsg_out), GFP_KERNEL);
if (!smsg_out)
return;
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;
out_src = smsg_out;
break;
case WRITE_TO_FILE:
out_src = fcopy_transaction.fcopy_msg;
out_len = sizeof(struct hv_do_fcopy);
break;
default:
out_src = fcopy_transaction.fcopy_msg;
out_len = fcopy_transaction.recv_len;
break;
}
fcopy_transaction.state = HVUTIL_USERSPACE_REQ;
rc = hvutil_transport_send(hvt, out_src, out_len, NULL);
if (rc) {
pr_debug("FCP: failed to communicate to the daemon: %d\n", rc);
if (cancel_delayed_work_sync(&fcopy_timeout_work)) {
fcopy_respond_to_host(HV_E_FAIL);
fcopy_transaction.state = HVUTIL_READY;
}
}
kfree(smsg_out);
}
/*
* 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;
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;
int fcopy_srv_version;
if (fcopy_transaction.state > HVUTIL_READY)
return;
if (vmbus_recvpacket(channel, recv_buffer, HV_HYP_PAGE_SIZE * 2, &recvlen, &requestid)) {
pr_err_ratelimited("Fcopy request received. Could not read into recv buf\n");
return;
}
if (!recvlen)
return;
/* Ensure recvlen is big enough to read header data */
if (recvlen < ICMSG_HDR) {
pr_err_ratelimited("Fcopy request received. Packet length too small: %d\n",
recvlen);
return;
}
icmsghdr = (struct icmsg_hdr *)&recv_buffer[
sizeof(struct vmbuspipe_hdr)];
if (icmsghdr->icmsgtype == ICMSGTYPE_NEGOTIATE) {
if (vmbus_prep_negotiate_resp(icmsghdr,
recv_buffer, recvlen,
fw_versions, FW_VER_COUNT,
fcopy_versions, FCOPY_VER_COUNT,
NULL, &fcopy_srv_version)) {
pr_info("FCopy IC version %d.%d\n",
fcopy_srv_version >> 16,
fcopy_srv_version & 0xFFFF);
}
} else if (icmsghdr->icmsgtype == ICMSGTYPE_FCOPY) {
/* Ensure recvlen is big enough to contain hv_fcopy_hdr */
if (recvlen < ICMSG_HDR + sizeof(struct hv_fcopy_hdr)) {
pr_err_ratelimited("Invalid Fcopy hdr. Packet length too small: %u\n",
recvlen);
return;
}
fcopy_msg = (struct hv_fcopy_hdr *)&recv_buffer[ICMSG_HDR];
/*
* Stash away this global state for completing the
* transaction; note transactions are serialized.
*/
fcopy_transaction.recv_len = recvlen;
fcopy_transaction.recv_req_id = requestid;
fcopy_transaction.fcopy_msg = fcopy_msg;
if (fcopy_transaction.state < HVUTIL_READY) {
/* Userspace is not registered yet */
fcopy_respond_to_host(HV_E_FAIL);
return;
}
fcopy_transaction.state = HVUTIL_HOSTMSG_RECEIVED;
/*
* Send the information to the user-level daemon.
*/
schedule_work(&fcopy_send_work);
schedule_delayed_work(&fcopy_timeout_work,
HV_UTIL_TIMEOUT * HZ);
return;
} else {
pr_err_ratelimited("Fcopy request received. Invalid msg type: %d\n",
icmsghdr->icmsgtype);
return;
}
icmsghdr->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE;
vmbus_sendpacket(channel, recv_buffer, recvlen, requestid,
VM_PKT_DATA_INBAND, 0);
}
/* Callback when data is received from userspace */
static int fcopy_on_msg(void *msg, int len)
{
int *val = (int *)msg;
if (len != sizeof(int))
return -EINVAL;
if (fcopy_transaction.state == HVUTIL_DEVICE_INIT)
return fcopy_handle_handshake(*val);
if (fcopy_transaction.state != HVUTIL_USERSPACE_REQ)
return -EINVAL;
/*
* Complete the transaction by forwarding the result
* to the host. But first, cancel the timeout.
*/
if (cancel_delayed_work_sync(&fcopy_timeout_work)) {
fcopy_transaction.state = HVUTIL_USERSPACE_RECV;
fcopy_respond_to_host(*val);
hv_poll_channel(fcopy_transaction.recv_channel,
fcopy_poll_wrapper);
}
return 0;
}
static void fcopy_on_reset(void)
{
/*
* The daemon has exited; reset the state.
*/
fcopy_transaction.state = HVUTIL_DEVICE_INIT;
if (cancel_delayed_work_sync(&fcopy_timeout_work))
fcopy_respond_to_host(HV_E_FAIL);
}
int hv_fcopy_init(struct hv_util_service *srv)
{
recv_buffer = srv->recv_buffer;
fcopy_transaction.recv_channel = srv->channel;
fcopy_transaction.recv_channel->max_pkt_size = HV_HYP_PAGE_SIZE * 2;
/*
* 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.state = HVUTIL_DEVICE_INIT;
hvt = hvutil_transport_init(fcopy_devname, 0, 0,
fcopy_on_msg, fcopy_on_reset);
if (!hvt)
return -EFAULT;
return 0;
}
static void hv_fcopy_cancel_work(void)
{
cancel_delayed_work_sync(&fcopy_timeout_work);
cancel_work_sync(&fcopy_send_work);
}
int hv_fcopy_pre_suspend(void)
{
struct vmbus_channel *channel = fcopy_transaction.recv_channel;
struct hv_fcopy_hdr *fcopy_msg;
/*
* Fake a CANCEL_FCOPY message for the user space daemon in case the
* daemon is in the middle of copying some file. It doesn't matter if
* there is already a message pending to be delivered to the user
* space since we force fcopy_transaction.state to be HVUTIL_READY, so
* the user space daemon's write() will fail with EINVAL (see
* fcopy_on_msg()), and the daemon will reset the device by closing
* and re-opening it.
*/
fcopy_msg = kzalloc(sizeof(*fcopy_msg), GFP_KERNEL);
if (!fcopy_msg)
return -ENOMEM;
tasklet_disable(&channel->callback_event);
fcopy_msg->operation = CANCEL_FCOPY;
hv_fcopy_cancel_work();
/* We don't care about the return value. */
hvutil_transport_send(hvt, fcopy_msg, sizeof(*fcopy_msg), NULL);
kfree(fcopy_msg);
fcopy_transaction.state = HVUTIL_READY;
/* tasklet_enable() will be called in hv_fcopy_pre_resume(). */
return 0;
}
int hv_fcopy_pre_resume(void)
{
struct vmbus_channel *channel = fcopy_transaction.recv_channel;
tasklet_enable(&channel->callback_event);
return 0;
}
void hv_fcopy_deinit(void)
{
fcopy_transaction.state = HVUTIL_DEVICE_DYING;
hv_fcopy_cancel_work();
hvutil_transport_destroy(hvt);
}

12
drivers/hv/hv_util.c
View file

@ -154,14 +154,6 @@ 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_pre_suspend = hv_fcopy_pre_suspend,
.util_pre_resume = hv_fcopy_pre_resume,
.util_deinit = hv_fcopy_deinit,
};
static void perform_shutdown(struct work_struct *dummy)
{
orderly_poweroff(true);
@ -700,10 +692,6 @@ 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
},
{ },
};

266
tools/hv/hv_fcopy_daemon.c
View file

@ -1,266 +0,0 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* An implementation of host to guest copy functionality for Linux.
*
* Copyright (C) 2014, Microsoft, Inc.
*
* Author : K. Y. Srinivasan <kys@microsoft.com>
*/
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <linux/hyperv.h>
#include <linux/limits.h>
#include <syslog.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <getopt.h>
static int target_fd;
static char target_fname[PATH_MAX];
static unsigned long long filesize;
static int hv_start_fcopy(struct hv_start_fcopy *smsg)
{
int error = HV_E_FAIL;
char *q, *p;
filesize = 0;
p = (char *)smsg->path_name;
snprintf(target_fname, sizeof(target_fname), "%s/%s",
(char *)smsg->path_name, (char *)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)) {
error = HV_ERROR_ALREADY_EXISTS;
goto done;
}
}
target_fd = open(target_fname,
O_RDWR | O_CREAT | O_TRUNC | O_CLOEXEC, 0744);
if (target_fd == -1) {
syslog(LOG_INFO, "Open Failed: %s", strerror(errno));
goto done;
}
error = 0;
done:
if (error)
target_fname[0] = '\0';
return error;
}
static int hv_copy_data(struct hv_do_fcopy *cpmsg)
{
ssize_t bytes_written;
int ret = 0;
bytes_written = pwrite(target_fd, cpmsg->data, cpmsg->size,
cpmsg->offset);
filesize += cpmsg->size;
if (bytes_written != cpmsg->size) {
switch (errno) {
case ENOSPC:
ret = HV_ERROR_DISK_FULL;
break;
default:
ret = HV_E_FAIL;
break;
}
syslog(LOG_ERR, "pwrite failed to write %llu bytes: %ld (%s)",
filesize, (long)bytes_written, strerror(errno));
}
return ret;
}
/*
* Reset target_fname to "" in the two below functions for hibernation: if
* the fcopy operation is aborted by hibernation, the daemon should remove the
* partially-copied file; to achieve this, the hv_utils driver always fakes a
* CANCEL_FCOPY message upon suspend, and later when the VM resumes back,
* the daemon calls hv_copy_cancel() to remove the file; if a file is copied
* successfully before suspend, hv_copy_finished() must reset target_fname to
* avoid that the file can be incorrectly removed upon resume, since the faked
* CANCEL_FCOPY message is spurious in this case.
*/
static int hv_copy_finished(void)
{
close(target_fd);
target_fname[0] = '\0';
return 0;
}
static int hv_copy_cancel(void)
{
close(target_fd);
if (strlen(target_fname) > 0) {
unlink(target_fname);
target_fname[0] = '\0';
}
return 0;
}
void print_usage(char *argv[])
{
fprintf(stderr, "Usage: %s [options]\n"
"Options are:\n"
" -n, --no-daemon stay in foreground, don't daemonize\n"
" -h, --help print this help\n", argv[0]);
}
int main(int argc, char *argv[])
{
int fcopy_fd = -1;
int error;
int daemonize = 1, long_index = 0, opt;
int version = FCOPY_CURRENT_VERSION;
union {
struct hv_fcopy_hdr hdr;
struct hv_start_fcopy start;
struct hv_do_fcopy copy;
__u32 kernel_modver;
} buffer = { };
int in_handshake;
static struct option long_options[] = {
{"help", no_argument, 0, 'h' },
{"no-daemon", no_argument, 0, 'n' },
{0, 0, 0, 0 }
};
while ((opt = getopt_long(argc, argv, "hn", long_options,
&long_index)) != -1) {
switch (opt) {
case 'n':
daemonize = 0;
break;
case 'h':
default:
print_usage(argv);
exit(EXIT_FAILURE);
}
}
if (daemonize && daemon(1, 0)) {
syslog(LOG_ERR, "daemon() failed; error: %s", strerror(errno));
exit(EXIT_FAILURE);
}
openlog("HV_FCOPY", 0, LOG_USER);
syslog(LOG_INFO, "starting; pid is:%d", getpid());
reopen_fcopy_fd:
if (fcopy_fd != -1)
close(fcopy_fd);
/* Remove any possible partially-copied file on error */
hv_copy_cancel();
in_handshake = 1;
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.
*/
ssize_t len;
len = pread(fcopy_fd, &buffer, sizeof(buffer), 0);
if (len < 0) {
syslog(LOG_ERR, "pread failed: %s", strerror(errno));
goto reopen_fcopy_fd;
}
if (in_handshake) {
if (len != sizeof(buffer.kernel_modver)) {
syslog(LOG_ERR, "invalid version negotiation");
exit(EXIT_FAILURE);
}
in_handshake = 0;
syslog(LOG_INFO, "kernel module version: %u",
buffer.kernel_modver);
continue;
}
switch (buffer.hdr.operation) {
case START_FILE_COPY:
error = hv_start_fcopy(&buffer.start);
break;
case WRITE_TO_FILE:
error = hv_copy_data(&buffer.copy);
break;
case COMPLETE_FCOPY:
error = hv_copy_finished();
break;
case CANCEL_FCOPY:
error = hv_copy_cancel();
break;
default:
error = HV_E_FAIL;
syslog(LOG_ERR, "Unknown operation: %d",
buffer.hdr.operation);
}
/*
* pwrite() may return an error due to the faked CANCEL_FCOPY
* message upon hibernation. Ignore the error by resetting the
* dev file, i.e. closing and re-opening it.
*/
if (pwrite(fcopy_fd, &error, sizeof(int), 0) != sizeof(int)) {
syslog(LOG_ERR, "pwrite failed: %s", strerror(errno));
goto reopen_fcopy_fd;
}
}
}