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Drivers: hv: fcopy: convert to hv_utils_transport

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Unify the code with the recently introduced hv_utils_transport. Netlink
communication is disabled for fcopy.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Tested-by: Alex Ng <alexng@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vitaly Kuznetsov 2015-04-11 18:07:53 -07:00 committed by Greg Kroah-Hartman
parent 6472f80a2e
commit c7e490fc23
1 changed files with 46 additions and 148 deletions
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194
drivers/hv/hv_fcopy.c
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@ -19,17 +19,13 @@
#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"
#include "hv_utils_transport.h"
#define WIN8_SRV_MAJOR 1
#define WIN8_SRV_MINOR 1
@ -53,18 +49,19 @@ static struct {
int state; /* hvutil_device_state */
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 void fcopy_send_data(void);
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;
static void fcopy_timeout_func(struct work_struct *dummy)
{
@ -78,17 +75,6 @@ static void fcopy_timeout_func(struct work_struct *dummy)
if (fcopy_transaction.state > HVUTIL_READY)
fcopy_transaction.state = HVUTIL_READY;
/* In the case the user-space daemon crashes, hangs or is killed, we
* need to down the semaphore, otherwise, after the daemon starts next
* time, the obsolete data in fcopy_transaction.message or
* fcopy_transaction.fcopy_msg will be used immediately.
*
* NOTE: fcopy_read() happens to get the semaphore (very rare)? We're
* still OK, because we've reported the failure to the host.
*/
if (down_trylock(&fcopy_transaction.read_sema))
;
hv_poll_channel(fcopy_transaction.fcopy_context,
hv_fcopy_onchannelcallback);
}
@ -115,11 +101,13 @@ static int fcopy_handle_handshake(u32 version)
return 0;
}
static void fcopy_send_data(void)
static void fcopy_send_data(struct work_struct *dummy)
{
struct hv_start_fcopy *smsg_out = &fcopy_transaction.message;
struct hv_start_fcopy smsg_out;
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
@ -134,26 +122,39 @@ static void fcopy_send_data(void)
switch (operation) {
case START_FILE_COPY:
memset(smsg_out, 0, sizeof(struct hv_start_fcopy));
smsg_out->hdr.operation = operation;
out_len = sizeof(struct hv_start_fcopy);
memset(&smsg_out, 0, out_len);
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);
(__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);
(__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;
smsg_out.copy_flags = smsg_in->copy_flags;
smsg_out.file_size = smsg_in->file_size;
out_src = &smsg_out;
break;
default:
out_src = fcopy_transaction.fcopy_msg;
out_len = fcopy_transaction.recv_len;
break;
}
up(&fcopy_transaction.read_sema);
fcopy_transaction.state = HVUTIL_USERSPACE_REQ;
rc = hvutil_transport_send(hvt, out_src, out_len);
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;
}
}
return;
}
@ -255,8 +256,8 @@ void hv_fcopy_onchannelcallback(void *context)
/*
* Send the information to the user-level daemon.
*/
schedule_work(&fcopy_send_work);
schedule_delayed_work(&fcopy_timeout_work, 5*HZ);
fcopy_send_data();
return;
}
icmsghdr->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE;
@ -264,69 +265,16 @@ void hv_fcopy_onchannelcallback(void *context)
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)
/* Callback when data is received from userspace */
static int fcopy_on_msg(void *msg, int len)
{
void *src;
size_t copy_size;
int operation;
int *val = (int *)msg;
/*
* 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 state to
* correctly handle this case.
*/
if (fcopy_transaction.state != HVUTIL_HOSTMSG_RECEIVED)
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;
fcopy_transaction.state = HVUTIL_USERSPACE_REQ;
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))
if (len != sizeof(int))
return -EINVAL;
if (copy_from_user(&response, buf, sizeof(int)))
return -EFAULT;
if (fcopy_transaction.state == HVUTIL_DEVICE_INIT) {
if (fcopy_handle_handshake(response))
return -EINVAL;
return sizeof(int);
}
if (fcopy_transaction.state == HVUTIL_DEVICE_INIT)
return fcopy_handle_handshake(*val);
if (fcopy_transaction.state != HVUTIL_USERSPACE_REQ)
return -EINVAL;
@ -337,78 +285,24 @@ static ssize_t fcopy_write(struct file *file, const char __user *buf,
*/
if (cancel_delayed_work_sync(&fcopy_timeout_work)) {
fcopy_transaction.state = HVUTIL_USERSPACE_RECV;
fcopy_respond_to_host(response);
fcopy_respond_to_host(*val);
fcopy_transaction.state = HVUTIL_READY;
hv_poll_channel(fcopy_transaction.fcopy_context,
hv_fcopy_onchannelcallback);
}
return sizeof(int);
}
static 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 (fcopy_transaction.state != HVUTIL_DEVICE_INIT)
return -EBUSY;
return 0;
}
/* XXX: there are still some tricky corner cases, e.g.,
* In an SMP guest, when fcopy_release() runs between
* schedule_delayed_work() and fcopy_send_data(), there is
* still a chance an obsolete message will be queued.
*/
static int fcopy_release(struct inode *inode, struct file *f)
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)) {
/* We haven't up()-ed the semaphore(very rare)? */
if (down_trylock(&fcopy_transaction.read_sema))
;
if (cancel_delayed_work_sync(&fcopy_timeout_work))
fcopy_respond_to_host(HV_E_FAIL);
}
return 0;
}
static const struct file_operations fcopy_fops = {
.owner = THIS_MODULE,
.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)
{
/*
* 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)
@ -422,14 +316,18 @@ int hv_fcopy_init(struct hv_util_service *srv)
* has registered.
*/
fcopy_transaction.state = HVUTIL_DEVICE_INIT;
sema_init(&fcopy_transaction.read_sema, 0);
return fcopy_dev_init();
hvt = hvutil_transport_init(fcopy_devname, 0, 0,
fcopy_on_msg, fcopy_on_reset);
if (!hvt)
return -EFAULT;
return 0;
}
void hv_fcopy_deinit(void)
{
fcopy_transaction.state = HVUTIL_DEVICE_DYING;
cancel_delayed_work_sync(&fcopy_timeout_work);
fcopy_dev_deinit();
hvutil_transport_destroy(hvt);
}