node_device_udev.c 45.6 KB
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/*
 * node_device_udev.c: node device enumeration - libudev implementation
 *
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 * Copyright (C) 2009-2010 Red Hat, Inc.
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 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
 *
 * Author: Dave Allan <dallan@redhat.com>
 */

#include <config.h>
#include <libudev.h>
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#include <pciaccess.h>
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#include <scsi/scsi.h>
#include <c-ctype.h>

#include "node_device_udev.h"
#include "virterror_internal.h"
#include "node_device_conf.h"
#include "node_device_driver.h"
#include "driver.h"
#include "datatypes.h"
#include "logging.h"
#include "memory.h"
#include "uuid.h"
#include "util.h"
#include "buf.h"
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#include "event.h"
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#define VIR_FROM_THIS VIR_FROM_NODEDEV

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struct _udevPrivate {
    struct udev_monitor *udev_monitor;
    int watch;
};

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static virDeviceMonitorStatePtr driverState = NULL;

static int udevStrToLong_ull(char const *s,
                             char **end_ptr,
                             int base,
                             unsigned long long *result)
{
    int ret = 0;

    ret = virStrToLong_ull(s, end_ptr, base, result);
    if (ret != 0) {
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        VIR_ERROR(_("Failed to convert '%s' to unsigned long long"), s);
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    } else {
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        VIR_DEBUG("Converted '%s' to unsigned long %llu", s, *result);
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    }

    return ret;
}


static int udevStrToLong_ui(char const *s,
                            char **end_ptr,
                            int base,
                            unsigned int *result)
{
    int ret = 0;

    ret = virStrToLong_ui(s, end_ptr, base, result);
    if (ret != 0) {
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        VIR_ERROR(_("Failed to convert '%s' to unsigned int"), s);
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    } else {
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        VIR_DEBUG("Converted '%s' to unsigned int %u", s, *result);
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    }

    return ret;
}

static int udevStrToLong_i(char const *s,
                           char **end_ptr,
                           int base,
                           int *result)
{
    int ret = 0;

    ret = virStrToLong_i(s, end_ptr, base, result);
    if (ret != 0) {
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        VIR_ERROR(_("Failed to convert '%s' to int"), s);
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    } else {
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        VIR_DEBUG("Converted '%s' to int %u", s, *result);
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    }

    return ret;
}


/* This function allocates memory from the heap for the property
 * value.  That memory must be later freed by some other code. */
static int udevGetDeviceProperty(struct udev_device *udev_device,
                                 const char *property_key,
                                 char **property_value)
{
    const char *udev_value = NULL;
    int ret = PROPERTY_FOUND;

    udev_value = udev_device_get_property_value(udev_device, property_key);
    if (udev_value == NULL) {
        VIR_INFO(_("udev reports device '%s' does not have property '%s'"),
                 udev_device_get_sysname(udev_device), property_key);
        ret = PROPERTY_MISSING;
        goto out;
    }

    /* If this allocation is changed, the comment at the beginning
     * of the function must also be changed. */
    *property_value = strdup(udev_value);
    if (*property_value == NULL) {
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        VIR_ERROR(_("Failed to allocate memory for property value for "
                    "property key '%s' on device with sysname '%s'"),
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                  property_key, udev_device_get_sysname(udev_device));
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        virReportOOMError();
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        ret = PROPERTY_ERROR;
        goto out;
    }

    VIR_DEBUG("Found property key '%s' value '%s' "
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              "for device with sysname '%s'",
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              property_key, *property_value,
              udev_device_get_sysname(udev_device));

out:
    return ret;
}


static int udevGetStringProperty(struct udev_device *udev_device,
                                 const char *property_key,
                                 char **value)
{
    return udevGetDeviceProperty(udev_device, property_key, value);
}


static int udevGetIntProperty(struct udev_device *udev_device,
                              const char *property_key,
                              int *value,
                              int base)
{
    char *udev_value = NULL;
    int ret = PROPERTY_FOUND;

    ret = udevGetDeviceProperty(udev_device, property_key, &udev_value);

    if (ret == PROPERTY_FOUND) {
        if (udevStrToLong_i(udev_value, NULL, base, value) != 0) {
            ret = PROPERTY_ERROR;
        }
    }

    VIR_FREE(udev_value);
    return ret;
}


static int udevGetUintProperty(struct udev_device *udev_device,
                               const char *property_key,
                               unsigned int *value,
                               int base)
{
    char *udev_value = NULL;
    int ret = PROPERTY_FOUND;

    ret = udevGetDeviceProperty(udev_device, property_key, &udev_value);

    if (ret == PROPERTY_FOUND) {
        if (udevStrToLong_ui(udev_value, NULL, base, value) != 0) {
            ret = PROPERTY_ERROR;
        }
    }

    VIR_FREE(udev_value);
    return ret;
}


/* This function allocates memory from the heap for the property
 * value.  That memory must be later freed by some other code. */
static int udevGetDeviceSysfsAttr(struct udev_device *udev_device,
                                  const char *attr_name,
                                  char **attr_value)
{
    const char *udev_value = NULL;
    int ret = PROPERTY_FOUND;

    udev_value = udev_device_get_sysattr_value(udev_device, attr_name);
    if (udev_value == NULL) {
        VIR_INFO(_("udev reports device '%s' does not have sysfs attr '%s'"),
                 udev_device_get_sysname(udev_device), attr_name);
        ret = PROPERTY_MISSING;
        goto out;
    }

    /* If this allocation is changed, the comment at the beginning
     * of the function must also be changed. */
    *attr_value = strdup(udev_value);
    if (*attr_value == NULL) {
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        VIR_ERROR(_("Failed to allocate memory for sysfs attribute value for "
                    "sysfs attribute '%s' on device with sysname '%s'"),
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                  attr_name, udev_device_get_sysname(udev_device));
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        virReportOOMError();
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        ret = PROPERTY_ERROR;
        goto out;
    }

    VIR_DEBUG("Found sysfs attribute '%s' value '%s' "
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              "for device with sysname '%s'",
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              attr_name, *attr_value,
              udev_device_get_sysname(udev_device));

out:
    return ret;
}


static int udevGetStringSysfsAttr(struct udev_device *udev_device,
                                  const char *attr_name,
                                  char **value)
{
    char *tmp = NULL;
    int ret = PROPERTY_MISSING;

    ret = udevGetDeviceSysfsAttr(udev_device, attr_name, &tmp);

    if (tmp != NULL && (STREQ(tmp, ""))) {
        VIR_FREE(tmp);
        tmp = NULL;
        ret = PROPERTY_MISSING;
    }

    *value = tmp;

    return ret;
}


static int udevGetIntSysfsAttr(struct udev_device *udev_device,
                               const char *attr_name,
                               int *value,
                               int base)
{
    char *udev_value = NULL;
    int ret = PROPERTY_FOUND;

    ret = udevGetDeviceSysfsAttr(udev_device, attr_name, &udev_value);

    if (ret == PROPERTY_FOUND) {
        if (udevStrToLong_i(udev_value, NULL, base, value) != 0) {
            ret = PROPERTY_ERROR;
        }
    }

    VIR_FREE(udev_value);
    return ret;
}


static int udevGetUintSysfsAttr(struct udev_device *udev_device,
                                const char *attr_name,
                                unsigned int *value,
                                int base)
{
    char *udev_value = NULL;
    int ret = PROPERTY_FOUND;

    ret = udevGetDeviceSysfsAttr(udev_device, attr_name, &udev_value);

    if (ret == PROPERTY_FOUND) {
        if (udevStrToLong_ui(udev_value, NULL, base, value) != 0) {
            ret = PROPERTY_ERROR;
        }
    }

    VIR_FREE(udev_value);
    return ret;
}


static int udevGetUint64SysfsAttr(struct udev_device *udev_device,
                                  const char *attr_name,
                                  unsigned long long *value)
{
    char *udev_value = NULL;
    int ret = PROPERTY_FOUND;

    ret = udevGetDeviceSysfsAttr(udev_device, attr_name, &udev_value);

    if (ret == PROPERTY_FOUND) {
        if (udevStrToLong_ull(udev_value, NULL, 0, value) != 0) {
            ret = PROPERTY_ERROR;
        }
    }

    VIR_FREE(udev_value);
    return ret;
}


static int udevGenerateDeviceName(struct udev_device *device,
                                  virNodeDeviceDefPtr def,
                                  const char *s)
{
    int ret = 0, i = 0;
    virBuffer buf = VIR_BUFFER_INITIALIZER;

    virBufferVSprintf(&buf, "%s_%s",
                      udev_device_get_subsystem(device),
                      udev_device_get_sysname(device));

    if (s != NULL) {
        virBufferVSprintf(&buf, "_%s", s);
    }

    if (virBufferError(&buf)) {
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        virBufferFreeAndReset(&buf);
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        VIR_ERROR(_("Buffer error when generating device name for device "
                    "with sysname '%s'"), udev_device_get_sysname(device));
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        ret = -1;
    }

    def->name = virBufferContentAndReset(&buf);

    for (i = 0; i < strlen(def->name) ; i++) {
        if (!(c_isalnum(*(def->name + i)))) {
            *(def->name + i) = '_';
        }
    }

    return ret;
}


static void udevLogFunction(struct udev *udev ATTRIBUTE_UNUSED,
                            int priority ATTRIBUTE_UNUSED,
                            const char *file,
                            int line,
                            const char *fn,
                            const char *fmt,
                            va_list args)
{
    VIR_ERROR_INT(file, fn, line, fmt, args);
}


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static int udevTranslatePCIIds(unsigned int vendor,
                               unsigned int product,
                               char **vendor_string,
                               char **product_string)
{
    int ret = -1;
    struct pci_id_match m;
    const char *vendor_name = NULL, *device_name = NULL;

    if (pci_system_init() != 0) {
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        VIR_ERROR0(_("Failed to initialize libpciaccess"));
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        goto out;
    }

    m.vendor_id = vendor;
    m.device_id = product;
    m.subvendor_id = PCI_MATCH_ANY;
    m.subdevice_id = PCI_MATCH_ANY;
    m.device_class = 0;
    m.device_class_mask = 0;
    m.match_data = 0;

    /* pci_get_strings returns void */
    pci_get_strings(&m,
                    &device_name,
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                    &vendor_name,
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                    NULL,
                    NULL);

    if (vendor_name != NULL) {
        *vendor_string = strdup(vendor_name);
        if (*vendor_string == NULL) {
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            virReportOOMError();
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            goto out;
        }
    }

    if (device_name != NULL) {
        *product_string = strdup(device_name);
        if (*product_string == NULL) {
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            virReportOOMError();
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            goto out;
        }
    }

    /* pci_system_cleanup returns void */
    pci_system_cleanup();

    ret = 0;

out:
    return ret;
}


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static int udevProcessPCI(struct udev_device *device,
                          virNodeDeviceDefPtr def)
{
    const char *devpath = NULL;
    union _virNodeDevCapData *data = &def->caps->data;
    int ret = -1;

    devpath = udev_device_get_devpath(device);

    if (udevGetUintProperty(device,
                            "PCI_CLASS",
                            &data->pci_dev.class,
                            16) == PROPERTY_ERROR) {
        goto out;
    }

    char *p = strrchr(devpath, '/');

    if ((p == NULL) || (udevStrToLong_ui(p+1,
                                         &p,
                                         16,
                                         &data->pci_dev.domain) == -1)) {
        goto out;
    }

    if ((p == NULL) || (udevStrToLong_ui(p+1,
                                         &p,
                                         16,
                                         &data->pci_dev.bus) == -1)) {
        goto out;
    }

    if ((p == NULL) || (udevStrToLong_ui(p+1,
                                         &p,
                                         16,
                                         &data->pci_dev.slot) == -1)) {
        goto out;
    }

    if ((p == NULL) || (udevStrToLong_ui(p+1,
                                         &p,
                                         16,
                                         &data->pci_dev.function) == -1)) {
        goto out;
    }

    if (udevGetUintSysfsAttr(device,
                             "vendor",
                             &data->pci_dev.vendor,
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                             16) == PROPERTY_ERROR) {
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        goto out;
    }

    if (udevGetUintSysfsAttr(device,
                             "device",
                             &data->pci_dev.product,
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                             16) == PROPERTY_ERROR) {
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        goto out;
    }

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    if (udevTranslatePCIIds(data->pci_dev.vendor,
                            data->pci_dev.product,
                            &data->pci_dev.vendor_name,
                            &data->pci_dev.product_name) != 0) {
        goto out;
    }
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    if (udevGenerateDeviceName(device, def, NULL) != 0) {
        goto out;
    }

    ret = 0;

out:
    return ret;
}


static int udevProcessUSBDevice(struct udev_device *device,
                                virNodeDeviceDefPtr def)
{
    union _virNodeDevCapData *data = &def->caps->data;
    int ret = -1;

    if (udevGetUintProperty(device,
                            "BUSNUM",
                            &data->usb_dev.bus,
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                            10) == PROPERTY_ERROR) {
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        goto out;
    }

    if (udevGetUintProperty(device,
                            "DEVNUM",
                            &data->usb_dev.device,
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                            10) == PROPERTY_ERROR) {
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        goto out;
    }

    if (udevGetUintProperty(device,
                            "ID_VENDOR_ID",
                            &data->usb_dev.vendor,
                            16) == PROPERTY_ERROR) {
        goto out;
    }

    if (udevGetStringSysfsAttr(device,
                              "manufacturer",
                              &data->usb_dev.vendor_name) == PROPERTY_ERROR) {
        goto out;
    }

    if (udevGetUintProperty(device,
                            "ID_MODEL_ID",
                            &data->usb_dev.product,
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                            16) == PROPERTY_ERROR) {
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        goto out;
    }

    if (udevGetStringSysfsAttr(device,
                              "product",
                              &data->usb_dev.product_name) == PROPERTY_ERROR) {
        goto out;
    }

    if (udevGenerateDeviceName(device, def, NULL) != 0) {
        goto out;
    }

    ret = 0;

out:
    return ret;
}


static int udevProcessUSBInterface(struct udev_device *device,
                                   virNodeDeviceDefPtr def)
{
    int ret = -1;
    union _virNodeDevCapData *data = &def->caps->data;

    if (udevGetUintSysfsAttr(device,
                             "bInterfaceNumber",
                             &data->usb_if.number,
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                             16) == PROPERTY_ERROR) {
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        goto out;
    }

    if (udevGetUintSysfsAttr(device,
                             "bInterfaceClass",
                             &data->usb_if._class,
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                             16) == PROPERTY_ERROR) {
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        goto out;
    }

    if (udevGetUintSysfsAttr(device,
                             "bInterfaceSubClass",
                             &data->usb_if.subclass,
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                             16) == PROPERTY_ERROR) {
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        goto out;
    }

    if (udevGetUintSysfsAttr(device,
                             "bInterfaceProtocol",
                             &data->usb_if.protocol,
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                             16) == PROPERTY_ERROR) {
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        goto out;
    }

    if (udevGenerateDeviceName(device, def, NULL) != 0) {
        goto out;
    }

    ret = 0;

out:
    return ret;
}


static int udevProcessNetworkInterface(struct udev_device *device,
                                       virNodeDeviceDefPtr def)
{
    int ret = -1;
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    const char *devtype = udev_device_get_devtype(device);
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    union _virNodeDevCapData *data = &def->caps->data;

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    if (devtype && STREQ(devtype, "wlan")) {
        data->net.subtype = VIR_NODE_DEV_CAP_NET_80211;
    } else {
        data->net.subtype = VIR_NODE_DEV_CAP_NET_80203;
    }

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    if (udevGetStringProperty(device,
                              "INTERFACE",
                              &data->net.ifname) == PROPERTY_ERROR) {
        goto out;
    }

    if (udevGetStringSysfsAttr(device,
                               "address",
                               &data->net.address) == PROPERTY_ERROR) {
        goto out;
    }

    if (udevGetUintSysfsAttr(device,
                             "addr_len",
                             &data->net.address_len,
                             0) == PROPERTY_ERROR) {
        goto out;
    }

    if (udevGenerateDeviceName(device, def, data->net.address) != 0) {
        goto out;
    }

    ret = 0;

out:
    return ret;
}


static int udevProcessSCSIHost(struct udev_device *device ATTRIBUTE_UNUSED,
                               virNodeDeviceDefPtr def)
{
    int ret = -1;
    union _virNodeDevCapData *data = &def->caps->data;
    char *filename = NULL;

    filename = basename(def->sysfs_path);

    if (!STRPREFIX(filename, "host")) {
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        VIR_ERROR(_("SCSI host found, but its udev name '%s' does "
                    "not begin with 'host'"), filename);
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        goto out;
    }

    if (udevStrToLong_ui(filename + strlen("host"),
                         NULL,
                         0,
                         &data->scsi_host.host) == -1) {
        goto out;
    }

    check_fc_host(&def->caps->data);
    check_vport_capable(&def->caps->data);

    if (udevGenerateDeviceName(device, def, NULL) != 0) {
        goto out;
    }

    ret = 0;

out:
    return ret;
}


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static int udevProcessSCSITarget(struct udev_device *device ATTRIBUTE_UNUSED,
                                 virNodeDeviceDefPtr def)
{
    int ret = -1;
    const char *sysname = NULL;
    union _virNodeDevCapData *data = &def->caps->data;

    sysname = udev_device_get_sysname(device);

    data->scsi_target.name = strdup(sysname);
    if (data->scsi_target.name == NULL) {
686
        virReportOOMError();
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        goto out;
    }

    if (udevGenerateDeviceName(device, def, NULL) != 0) {
        goto out;
    }

    ret = 0;

out:
    return ret;
}


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static int udevGetSCSIType(unsigned int type, char **typestring)
{
    int ret = 0;
    int foundtype = 1;

    *typestring = NULL;

    switch (type) {
    case TYPE_DISK:
        *typestring = strdup("disk");
        break;
    case TYPE_TAPE:
        *typestring = strdup("tape");
        break;
    case TYPE_PROCESSOR:
        *typestring = strdup("processor");
        break;
    case TYPE_WORM:
        *typestring = strdup("worm");
        break;
    case TYPE_ROM:
        *typestring = strdup("cdrom");
        break;
    case TYPE_SCANNER:
        *typestring = strdup("scanner");
        break;
    case TYPE_MOD:
        *typestring = strdup("mod");
        break;
    case TYPE_MEDIUM_CHANGER:
        *typestring = strdup("changer");
        break;
    case TYPE_ENCLOSURE:
        *typestring = strdup("enclosure");
        break;
    case TYPE_NO_LUN:
    default:
        foundtype = 0;
        break;
    }

    if (*typestring == NULL) {
        if (foundtype == 1) {
            ret = -1;
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            virReportOOMError();
746
        } else {
747
            VIR_ERROR(_("Failed to find SCSI device type %d"), type);
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        }
    }

    return ret;
}


static int udevProcessSCSIDevice(struct udev_device *device ATTRIBUTE_UNUSED,
                                 virNodeDeviceDefPtr def)
{
    int ret = -1;
    unsigned int tmp = 0;
    union _virNodeDevCapData *data = &def->caps->data;
    char *filename = NULL, *p = NULL;

    filename = basename(def->sysfs_path);

    if (udevStrToLong_ui(filename, &p, 10, &data->scsi.host) == -1) {
        goto out;
    }

    if ((p == NULL) || (udevStrToLong_ui(p+1,
                                         &p,
                                         10,
                                         &data->scsi.bus) == -1)) {
        goto out;
    }

    if ((p == NULL) || (udevStrToLong_ui(p+1,
                                         &p,
                                         10,
                                         &data->scsi.target) == -1)) {
        goto out;
    }

    if ((p == NULL) || (udevStrToLong_ui(p+1,
                                         &p,
                                         10,
                                         &data->scsi.lun) == -1)) {
        goto out;
    }

    switch (udevGetUintSysfsAttr(device, "type", &tmp, 0)) {
    case PROPERTY_FOUND:
        if (udevGetSCSIType(tmp, &data->scsi.type) == -1) {
            goto out;
        }
        break;
    case PROPERTY_MISSING:
        break; /* No type is not an error */
    case PROPERTY_ERROR:
    default:
        goto out;
        break;
    }

    if (udevGenerateDeviceName(device, def, NULL) != 0) {
        goto out;
    }

    ret = 0;

out:
    if (ret != 0) {
812
        VIR_ERROR(_("Failed to process SCSI device with sysfs path '%s'"),
813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845
                  def->sysfs_path);
    }
    return ret;
}


static int udevProcessDisk(struct udev_device *device,
                           virNodeDeviceDefPtr def)
{
    union _virNodeDevCapData *data = &def->caps->data;
    int ret = 0;

    if (udevGetUint64SysfsAttr(device,
                               "size",
                               &data->storage.num_blocks) == PROPERTY_ERROR) {
        goto out;
    }

    if (udevGetUint64SysfsAttr(device,
                               "queue/logical_block_size",
                               &data->storage.logical_block_size)
        == PROPERTY_ERROR) {
        goto out;
    }

    data->storage.size = data->storage.num_blocks *
        data->storage.logical_block_size;

out:
    return ret;
}


846 847 848
static int udevProcessRemoveableMedia(struct udev_device *device,
                                      virNodeDeviceDefPtr def,
                                      int has_media)
849 850 851 852 853 854 855 856 857
{
    union _virNodeDevCapData *data = &def->caps->data;
    int tmp_int = 0, ret = 0;

    if ((udevGetIntSysfsAttr(device, "removable", &tmp_int, 0) == PROPERTY_FOUND) &&
        (tmp_int == 1)) {
        def->caps->data.storage.flags |= VIR_NODE_DEV_CAP_STORAGE_REMOVABLE;
    }

858
    if (has_media) {
859 860 861 862

        def->caps->data.storage.flags |=
            VIR_NODE_DEV_CAP_STORAGE_REMOVABLE_MEDIA_AVAILABLE;

863 864 865 866 867
        if (udevGetStringProperty(device, "ID_FS_LABEL",
                                  &data->storage.media_label) == PROPERTY_ERROR) {
            goto out;
        }

868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892
        if (udevGetUint64SysfsAttr(device,
                                   "size",
                                   &data->storage.num_blocks) == PROPERTY_ERROR) {
            goto out;
        }

        if (udevGetUint64SysfsAttr(device,
                                   "queue/logical_block_size",
                                   &data->storage.logical_block_size) == PROPERTY_ERROR) {
            goto out;
        }

        /* XXX This calculation is wrong for the qemu virtual cdrom
         * which reports the size in 512 byte blocks, but the logical
         * block size as 2048.  I don't have a physical cdrom on a
         * devel system to see how they behave. */
        def->caps->data.storage.removable_media_size =
            def->caps->data.storage.num_blocks *
            def->caps->data.storage.logical_block_size;
    }

out:
    return ret;
}

893 894 895 896 897 898 899 900 901 902 903 904 905 906
static int udevProcessCDROM(struct udev_device *device,
                            virNodeDeviceDefPtr def)
{
    int ret = -1;
    int tmp_int = 0;
    int has_media = 0;

    /* NB: the drive_type string provided by udev is different from
     * that provided by HAL; now it's "cd" instead of "cdrom" We
     * change it to cdrom to preserve compatibility with earlier
     * versions of libvirt.  */
    VIR_FREE(def->caps->data.storage.drive_type);
    def->caps->data.storage.drive_type = strdup("cdrom");
    if (def->caps->data.storage.drive_type == NULL) {
907
        virReportOOMError();
908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939
        goto out;
    }

    if ((udevGetIntProperty(device, "ID_CDROM_MEDIA",
                            &tmp_int, 0) == PROPERTY_FOUND))
        has_media = tmp_int;

    ret = udevProcessRemoveableMedia(device, def, has_media);
out:
    return ret;
}

static int udevProcessFloppy(struct udev_device *device,
                             virNodeDeviceDefPtr def)
{
    int tmp_int = 0;
    int has_media = 0;
    char *tmp_str = NULL;

    if ((udevGetIntProperty(device, "DKD_MEDIA_AVAILABLE",
                            &tmp_int, 0) == PROPERTY_FOUND))
        /* USB floppy */
        has_media = tmp_int;
    else if (udevGetStringProperty(device, "ID_FS_LABEL",
                                   &tmp_str) == PROPERTY_FOUND) {
        /* Legacy floppy */
        has_media = 1;
        VIR_FREE(tmp_str);
    }

    return udevProcessRemoveableMedia(device, def, has_media);
}
940 941 942 943 944 945 946 947 948 949

/* This function exists to deal with the case in which a driver does
 * not provide a device type in the usual place, but udev told us it's
 * a storage device, and we can make a good guess at what kind of
 * storage device it is from other information that is provided. */
static int udevKludgeStorageType(virNodeDeviceDefPtr def)
{
    int ret = -1;

    VIR_INFO("Could not find definitive storage type for device "
950
             "with sysfs path '%s', trying to guess it",
951 952 953 954 955 956 957 958 959 960 961 962
             def->sysfs_path);

    if (STRPREFIX(def->caps->data.storage.block, "/dev/vd")) {
        /* virtio disk */
        def->caps->data.storage.drive_type = strdup("disk");
        if (def->caps->data.storage.drive_type != NULL) {
            ret = 0;
        }
    }

    if (ret != 0) {
        VIR_INFO("Could not determine storage type for device "
963
                 "with sysfs path '%s'", def->sysfs_path);
964 965
    } else {
        VIR_DEBUG("Found storage type '%s' for device "
966
                  "with sysfs path '%s'",
967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994
                  def->caps->data.storage.drive_type,
                  def->sysfs_path);
    }

    return ret;
}


static void udevStripSpaces(char *s)
{
    if (s == NULL) {
        return;
    }

    while (virFileStripSuffix(s, " ")) {
        /* do nothing */
        ;
    }

    return;
}


static int udevProcessStorage(struct udev_device *device,
                              virNodeDeviceDefPtr def)
{
    union _virNodeDevCapData *data = &def->caps->data;
    int ret = -1;
995
    const char* devnode;
996

997 998
    devnode = udev_device_get_devnode(device);
    if(!devnode) {
999
        VIR_DEBUG("No devnode for '%s'", udev_device_get_devpath(device));
1000 1001 1002
        goto out;
    }
    data->storage.block = strdup(devnode);
1003

1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033
    if (udevGetStringProperty(device,
                              "ID_BUS",
                              &data->storage.bus) == PROPERTY_ERROR) {
        goto out;
    }
    if (udevGetStringProperty(device,
                              "ID_SERIAL",
                              &data->storage.serial) == PROPERTY_ERROR) {
        goto out;
    }
    if (udevGetStringSysfsAttr(device,
                               "device/vendor",
                               &data->storage.vendor) == PROPERTY_ERROR) {
        goto out;
    }
    udevStripSpaces(def->caps->data.storage.vendor);
    if (udevGetStringSysfsAttr(device,
                               "device/model",
                               &data->storage.model) == PROPERTY_ERROR) {
        goto out;
    }
    udevStripSpaces(def->caps->data.storage.model);
    /* There is no equivalent of the hotpluggable property in libudev,
     * but storage is going toward a world in which hotpluggable is
     * expected, so I don't see a problem with not having a property
     * for it. */

    if (udevGetStringProperty(device,
                              "ID_TYPE",
                              &data->storage.drive_type) != PROPERTY_FOUND) {
1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050
        int tmp_int = 0;

        /* All floppy drives have the ID_DRIVE_FLOPPY prop. This is
         * needed since legacy floppies don't have a drive_type */
        if ((udevGetIntProperty(device, "ID_DRIVE_FLOPPY",
                                &tmp_int, 0) == PROPERTY_FOUND) &&
            (tmp_int == 1)) {

            data->storage.drive_type = strdup("floppy");
            if (!data->storage.drive_type)
                goto out;
        } else {

            /* If udev doesn't have it, perhaps we can guess it. */
            if (udevKludgeStorageType(def) != 0) {
                goto out;
            }
1051 1052 1053 1054 1055 1056 1057
        }
    }

    if (STREQ(def->caps->data.storage.drive_type, "cd")) {
        ret = udevProcessCDROM(device, def);
    } else if (STREQ(def->caps->data.storage.drive_type, "disk")) {
        ret = udevProcessDisk(device, def);
1058 1059
    } else if (STREQ(def->caps->data.storage.drive_type, "floppy")) {
        ret = udevProcessFloppy(device, def);
1060
    } else {
1061
        VIR_INFO("Unsupported storage type '%s'",
1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083
                 def->caps->data.storage.drive_type);
        goto out;
    }

    if (udevGenerateDeviceName(device, def, data->storage.serial) != 0) {
        goto out;
    }

out:
    return ret;
}


static int udevGetDeviceType(struct udev_device *device,
                             enum virNodeDevCapType *type)
{
    const char *devtype = NULL;
    char *tmp_string = NULL;
    unsigned int tmp = 0;
    int ret = 0;

    devtype = udev_device_get_devtype(device);
D
David Allan 已提交
1084 1085
    VIR_DEBUG("Found device type '%s' for device '%s'",
              NULLSTR(devtype), udev_device_get_sysname(device));
1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101

    if (devtype != NULL && STREQ(devtype, "usb_device")) {
        *type = VIR_NODE_DEV_CAP_USB_DEV;
        goto out;
    }

    if (devtype != NULL && STREQ(devtype, "usb_interface")) {
        *type = VIR_NODE_DEV_CAP_USB_INTERFACE;
        goto out;
    }

    if (devtype != NULL && STREQ(devtype, "scsi_host")) {
        *type = VIR_NODE_DEV_CAP_SCSI_HOST;
        goto out;
    }

D
David Allan 已提交
1102 1103 1104 1105 1106
    if (devtype != NULL && STREQ(devtype, "scsi_target")) {
        *type = VIR_NODE_DEV_CAP_SCSI_TARGET;
        goto out;
    }

1107 1108 1109 1110 1111 1112 1113 1114 1115 1116
    if (devtype != NULL && STREQ(devtype, "scsi_device")) {
        *type = VIR_NODE_DEV_CAP_SCSI;
        goto out;
    }

    if (devtype != NULL && STREQ(devtype, "disk")) {
        *type = VIR_NODE_DEV_CAP_STORAGE;
        goto out;
    }

D
David Allan 已提交
1117 1118 1119 1120 1121
    if (devtype != NULL && STREQ(devtype, "wlan")) {
        *type = VIR_NODE_DEV_CAP_NET;
        goto out;
    }

1122 1123 1124 1125 1126
    if (udevGetUintProperty(device, "PCI_CLASS", &tmp, 16) == PROPERTY_FOUND) {
        *type = VIR_NODE_DEV_CAP_PCI_DEV;
        goto out;
    }

D
David Allan 已提交
1127 1128 1129 1130
    /* It does not appear that wired network interfaces set the
     * DEVTYPE property.  USB devices also have an INTERFACE property,
     * but they do set DEVTYPE, so if devtype is NULL and the
     * INTERFACE property exists, we have a network device. */
1131 1132 1133 1134 1135 1136 1137 1138 1139 1140
    if (devtype == NULL &&
        udevGetStringProperty(device,
                              "INTERFACE",
                              &tmp_string) == PROPERTY_FOUND) {
        VIR_FREE(tmp_string);
        *type = VIR_NODE_DEV_CAP_NET;
        goto out;
    }

    VIR_INFO("Could not determine device type for device "
1141
             "with sysfs path '%s'",
1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173
             udev_device_get_sysname(device));
    ret = -1;

out:
    return ret;
}


static int udevGetDeviceDetails(struct udev_device *device,
                                virNodeDeviceDefPtr def)
{
    int ret = 0;

    switch (def->caps->type) {
    case VIR_NODE_DEV_CAP_SYSTEM:
        /* There's no libudev equivalent of system, so ignore it. */
        break;
    case VIR_NODE_DEV_CAP_PCI_DEV:
        ret = udevProcessPCI(device, def);
        break;
    case VIR_NODE_DEV_CAP_USB_DEV:
        ret = udevProcessUSBDevice(device, def);
        break;
    case VIR_NODE_DEV_CAP_USB_INTERFACE:
        ret = udevProcessUSBInterface(device, def);
        break;
    case VIR_NODE_DEV_CAP_NET:
        ret = udevProcessNetworkInterface(device, def);
        break;
    case VIR_NODE_DEV_CAP_SCSI_HOST:
        ret = udevProcessSCSIHost(device, def);
        break;
D
David Allan 已提交
1174 1175 1176
    case VIR_NODE_DEV_CAP_SCSI_TARGET:
        ret = udevProcessSCSITarget(device, def);
        break;
1177 1178 1179 1180 1181 1182 1183
    case VIR_NODE_DEV_CAP_SCSI:
        ret = udevProcessSCSIDevice(device, def);
        break;
    case VIR_NODE_DEV_CAP_STORAGE:
        ret = udevProcessStorage(device, def);
        break;
    default:
1184
        VIR_ERROR(_("Unknown device type %d"), def->caps->type);
1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199
        ret = -1;
        break;
    }

    return ret;
}


static int udevRemoveOneDevice(struct udev_device *device)
{
    virNodeDeviceObjPtr dev = NULL;
    const char *name = NULL;
    int ret = 0;

    name = udev_device_get_syspath(device);
1200
    nodeDeviceLock(driverState);
1201
    dev = virNodeDeviceFindBySysfsPath(&driverState->devs, name);
1202

1203
    if (dev != NULL) {
1204
        VIR_DEBUG("Removing device '%s' with sysfs path '%s'",
1205 1206 1207
                  dev->def->name, name);
        virNodeDeviceObjRemove(&driverState->devs, dev);
    } else {
1208
        VIR_INFO("Failed to find device to remove that has udev name '%s'",
1209 1210 1211
                 name);
        ret = -1;
    }
1212
    nodeDeviceUnlock(driverState);
1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225

    return ret;
}


static int udevSetParent(struct udev_device *device,
                         virNodeDeviceDefPtr def)
{
    struct udev_device *parent_device = NULL;
    const char *parent_sysfs_path = NULL;
    virNodeDeviceObjPtr dev = NULL;
    int ret = -1;

1226 1227
    parent_device = device;
    do {
1228

1229 1230 1231 1232
        parent_device = udev_device_get_parent(parent_device);
        if (parent_device == NULL) {
            break;
        }
1233

1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244
        parent_sysfs_path = udev_device_get_syspath(parent_device);
        if (parent_sysfs_path == NULL) {
            VIR_INFO("Could not get syspath for parent of '%s'",
                     udev_device_get_syspath(parent_device));
        }

        dev = virNodeDeviceFindBySysfsPath(&driverState->devs,
                                           parent_sysfs_path);
        if (dev != NULL) {
            def->parent = strdup(dev->def->name);
            virNodeDeviceObjUnlock(dev);
1245

1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261
            if (def->parent == NULL) {
                virReportOOMError();
                goto out;
            }

            def->parent_sysfs_path = strdup(parent_sysfs_path);
            if (def->parent_sysfs_path == NULL) {
                virReportOOMError();
                goto out;
            }

        }

    } while (def->parent == NULL && parent_device != NULL);

    if (def->parent == NULL) {
1262 1263 1264 1265
        def->parent = strdup("computer");
    }

    if (def->parent == NULL) {
1266
        virReportOOMError();
1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283
        goto out;
    }

    ret = 0;

out:
    return ret;
}


static int udevAddOneDevice(struct udev_device *device)
{
    virNodeDeviceDefPtr def = NULL;
    virNodeDeviceObjPtr dev = NULL;
    int ret = -1;

    if (VIR_ALLOC(def) != 0) {
1284
        virReportOOMError();
1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295
        goto out;
    }

    def->sysfs_path = strdup(udev_device_get_syspath(device));
    if (udevGetStringProperty(device,
                              "DRIVER",
                              &def->driver) == PROPERTY_ERROR) {
        goto out;
    }

    if (VIR_ALLOC(def->caps) != 0) {
1296
        virReportOOMError();
1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311
        goto out;
    }

    if (udevGetDeviceType(device, &def->caps->type) != 0) {
        goto out;
    }

    if (udevGetDeviceDetails(device, def) != 0) {
        goto out;
    }

    if (udevSetParent(device, def) != 0) {
        goto out;
    }

1312
    nodeDeviceLock(driverState);
1313
    dev = virNodeDeviceAssignDef(&driverState->devs, def);
1314 1315
    nodeDeviceUnlock(driverState);

1316
    if (dev == NULL) {
1317
        VIR_ERROR(_("Failed to create device for '%s'"), def->name);
1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342
        virNodeDeviceDefFree(def);
        goto out;
    }

    virNodeDeviceObjUnlock(dev);

    ret = 0;

out:
    return ret;
}


static int udevProcessDeviceListEntry(struct udev *udev,
                                      struct udev_list_entry *list_entry)
{
    struct udev_device *device;
    const char *name = NULL;
    int ret = -1;

    name = udev_list_entry_get_name(list_entry);

    device = udev_device_new_from_syspath(udev, name);
    if (device != NULL) {
        if (udevAddOneDevice(device) != 0) {
1343
            VIR_INFO("Failed to create node device for udev device '%s'",
1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363
                     name);
        }
        udev_device_unref(device);
        ret = 0;
    }

    return ret;
}


static int udevEnumerateDevices(struct udev *udev)
{
    struct udev_enumerate *udev_enumerate = NULL;
    struct udev_list_entry *list_entry = NULL;
    int ret = 0;

    udev_enumerate = udev_enumerate_new(udev);

    ret = udev_enumerate_scan_devices(udev_enumerate);
    if (0 != ret) {
1364
        VIR_ERROR(_("udev scan devices returned %d"), ret);
1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383
        goto out;
    }

    udev_list_entry_foreach(list_entry,
                            udev_enumerate_get_list_entry(udev_enumerate)) {

        udevProcessDeviceListEntry(udev, list_entry);
    }

out:
    udev_enumerate_unref(udev_enumerate);
    return ret;
}


static int udevDeviceMonitorShutdown(void)
{
    int ret = 0;

1384
    udevPrivate *priv = NULL;
1385 1386 1387 1388 1389
    struct udev_monitor *udev_monitor = NULL;
    struct udev *udev = NULL;

    if (driverState) {
        nodeDeviceLock(driverState);
1390 1391 1392 1393 1394 1395

        priv = driverState->privateData;

        if (priv->watch != -1)
            virEventRemoveHandle(priv->watch);

1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410
        udev_monitor = DRV_STATE_UDEV_MONITOR(driverState);

        if (udev_monitor != NULL) {
            udev = udev_monitor_get_udev(udev_monitor);
            udev_monitor_unref(udev_monitor);
        }

        if (udev != NULL) {
            udev_unref(udev);
        }

        virNodeDeviceObjListFree(&driverState->devs);
        nodeDeviceUnlock(driverState);
        virMutexDestroy(&driverState->lock);
        VIR_FREE(driverState);
1411
        VIR_FREE(priv);
1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431
    } else {
        ret = -1;
    }

    return ret;
}


static void udevEventHandleCallback(int watch ATTRIBUTE_UNUSED,
                                    int fd,
                                    int events ATTRIBUTE_UNUSED,
                                    void *data ATTRIBUTE_UNUSED)
{
    struct udev_device *device = NULL;
    struct udev_monitor *udev_monitor = DRV_STATE_UDEV_MONITOR(driverState);
    const char *action = NULL;
    int udev_fd = -1;

    udev_fd = udev_monitor_get_fd(udev_monitor);
    if (fd != udev_fd) {
1432 1433
        VIR_ERROR(_("File descriptor returned by udev %d does not "
                    "match node device file descriptor %d"), fd, udev_fd);
1434 1435 1436 1437 1438
        goto out;
    }

    device = udev_monitor_receive_device(udev_monitor);
    if (device == NULL) {
1439
        VIR_ERROR0(_("udev_monitor_receive_device returned NULL"));
1440 1441 1442 1443
        goto out;
    }

    action = udev_device_get_action(device);
1444
    VIR_DEBUG("udev action: '%s'", action);
1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460

    if (STREQ(action, "add") || STREQ(action, "change")) {
        udevAddOneDevice(device);
        goto out;
    }

    if (STREQ(action, "remove")) {
        udevRemoveOneDevice(device);
        goto out;
    }

out:
    return;
}


1461 1462
static void
udevGetDMIData(union _virNodeDevCapData *data)
1463 1464 1465 1466 1467 1468
{
    struct udev *udev = NULL;
    struct udev_device *device = NULL;
    char *tmp = NULL;

    udev = udev_monitor_get_udev(DRV_STATE_UDEV_MONITOR(driverState));
1469

1470 1471
    device = udev_device_new_from_syspath(udev, DMI_DEVPATH);
    if (device == NULL) {
1472 1473
        device = udev_device_new_from_syspath(udev, DMI_DEVPATH_FALLBACK);
        if (device == NULL) {
1474
            VIR_ERROR(_("Failed to get udev device for syspath '%s' or '%s'"),
1475
                      DMI_DEVPATH, DMI_DEVPATH_FALLBACK);
1476 1477
            goto out;
        }
1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503
    }

    if (udevGetStringSysfsAttr(device,
                               "product_name",
                               &data->system.product_name) == PROPERTY_ERROR) {
        goto out;
    }
    if (udevGetStringSysfsAttr(device,
                               "sys_vendor",
                               &data->system.hardware.vendor_name)
        == PROPERTY_ERROR) {
        goto out;
    }
    if (udevGetStringSysfsAttr(device,
                               "product_version",
                               &data->system.hardware.version)
        == PROPERTY_ERROR) {
        goto out;
    }
    if (udevGetStringSysfsAttr(device,
                               "product_serial",
                               &data->system.hardware.serial)
        == PROPERTY_ERROR) {
        goto out;
    }

1504
    if (virGetHostUUID(data->system.hardware.uuid))
1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525
        goto out;

    if (udevGetStringSysfsAttr(device,
                               "bios_vendor",
                               &data->system.firmware.vendor_name)
        == PROPERTY_ERROR) {
        goto out;
    }
    if (udevGetStringSysfsAttr(device,
                               "bios_version",
                               &data->system.firmware.version)
        == PROPERTY_ERROR) {
        goto out;
    }
    if (udevGetStringSysfsAttr(device,
                               "bios_date",
                               &data->system.firmware.release_date)
        == PROPERTY_ERROR) {
        goto out;
    }

1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557
out:
    VIR_FREE(tmp);
    if (device != NULL) {
        udev_device_unref(device);
    }
    return;
}


static int udevSetupSystemDev(void)
{
    virNodeDeviceDefPtr def = NULL;
    virNodeDeviceObjPtr dev = NULL;
    int ret = -1;

    if (VIR_ALLOC(def) != 0) {
        virReportOOMError();
        goto out;
    }

    def->name = strdup("computer");
    if (def->name == NULL) {
        virReportOOMError();
        goto out;
    }

    if (VIR_ALLOC(def->caps) != 0) {
        virReportOOMError();
        goto out;
    }

    udevGetDMIData(&def->caps->data);
1558

1559
    dev = virNodeDeviceAssignDef(&driverState->devs, def);
1560
    if (dev == NULL) {
1561
        VIR_ERROR(_("Failed to create device for '%s'"), def->name);
1562 1563 1564 1565 1566 1567 1568 1569
        goto out;
    }

    virNodeDeviceObjUnlock(dev);

    ret = 0;

out:
1570 1571 1572 1573
    if (ret == -1) {
        virNodeDeviceDefFree(def);
    }

1574 1575 1576 1577 1578
    return ret;
}

static int udevDeviceMonitorStartup(int privileged ATTRIBUTE_UNUSED)
{
1579
    udevPrivate *priv = NULL;
1580 1581 1582
    struct udev *udev = NULL;
    int ret = 0;

1583
    if (VIR_ALLOC(priv) < 0) {
1584
        virReportOOMError();
1585 1586 1587 1588 1589 1590
        ret = -1;
        goto out;
    }

    priv->watch = -1;

1591
    if (VIR_ALLOC(driverState) < 0) {
1592
        virReportOOMError();
1593
        VIR_FREE(priv);
1594 1595 1596 1597 1598
        ret = -1;
        goto out;
    }

    if (virMutexInit(&driverState->lock) < 0) {
1599
        VIR_ERROR0(_("Failed to initialize mutex for driverState"));
1600
        VIR_FREE(priv);
1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616
        VIR_FREE(driverState);
        ret = -1;
        goto out;
    }

    nodeDeviceLock(driverState);

    /*
     * http://www.kernel.org/pub/linux/utils/kernel/hotplug/libudev/libudev-udev.html#udev-new
     *
     * indicates no return value other than success, so we don't check
     * its return value.
     */
    udev = udev_new();
    udev_set_log_fn(udev, udevLogFunction);

1617 1618 1619 1620
    priv->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
    if (priv->udev_monitor == NULL) {
        VIR_FREE(priv);
        nodeDeviceUnlock(driverState);
1621
        VIR_ERROR0(_("udev_monitor_new_from_netlink returned NULL"));
1622 1623 1624 1625
        ret = -1;
        goto out;
    }

1626
    udev_monitor_enable_receiving(priv->udev_monitor);
1627 1628

    /* udev can be retrieved from udev_monitor */
1629
    driverState->privateData = priv;
1630 1631 1632 1633 1634 1635 1636 1637 1638

    /* We register the monitor with the event callback so we are
     * notified by udev of device changes before we enumerate existing
     * devices because libvirt will simply recreate the device if we
     * try to register it twice, i.e., if the device appears between
     * the time we register the callback and the time we begin
     * enumeration.  The alternative is to register the callback after
     * we enumerate, in which case we will fail to create any devices
     * that appear while the enumeration is taking place.  */
1639 1640 1641 1642 1643
    priv->watch = virEventAddHandle(udev_monitor_get_fd(priv->udev_monitor),
                                    VIR_EVENT_HANDLE_READABLE,
                                    udevEventHandleCallback, NULL, NULL);
    if (priv->watch == -1) {
        nodeDeviceUnlock(driverState);
1644 1645 1646 1647
        ret = -1;
        goto out;
    }

1648 1649
    nodeDeviceUnlock(driverState);

1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709
    /* Create a fictional 'computer' device to root the device tree. */
    if (udevSetupSystemDev() != 0) {
        ret = -1;
        goto out;
    }

    /* Populate with known devices */

    if (udevEnumerateDevices(udev) != 0) {
        ret = -1;
        goto out;
    }

out:
    if (ret == -1) {
        udevDeviceMonitorShutdown();
    }
    return ret;
}


static int udevDeviceMonitorReload(void)
{
    return 0;
}


static int udevDeviceMonitorActive(void)
{
    /* Always ready to deal with a shutdown */
    return 0;
}


static virDrvOpenStatus udevNodeDrvOpen(virConnectPtr conn,
                                        virConnectAuthPtr auth ATTRIBUTE_UNUSED,
                                        int flags ATTRIBUTE_UNUSED)
{
    if (driverState == NULL) {
        return VIR_DRV_OPEN_DECLINED;
    }

    conn->devMonPrivateData = driverState;

    return VIR_DRV_OPEN_SUCCESS;
}

static int udevNodeDrvClose(virConnectPtr conn)
{
    conn->devMonPrivateData = NULL;
    return 0;
}

static virDeviceMonitor udevDeviceMonitor = {
    .name = "udevDeviceMonitor",
    .open = udevNodeDrvOpen,
    .close = udevNodeDrvClose,
};

static virStateDriver udevStateDriver = {
M
Matthias Bolte 已提交
1710
    .name = "udev",
1711 1712 1713 1714 1715 1716 1717 1718
    .initialize = udevDeviceMonitorStartup,
    .cleanup = udevDeviceMonitorShutdown,
    .reload = udevDeviceMonitorReload,
    .active = udevDeviceMonitorActive,
};

int udevNodeRegister(void)
{
1719
    VIR_DEBUG0("Registering udev node device backend");
1720 1721 1722 1723 1724 1725 1726 1727

    registerCommonNodeFuncs(&udevDeviceMonitor);
    if (virRegisterDeviceMonitor(&udevDeviceMonitor) < 0) {
        return -1;
    }

    return virRegisterStateDriver(&udevStateDriver);
}