node_device_udev.c 46.4 KB
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/*
 * node_device_udev.c: node device enumeration - libudev implementation
 *
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 * Copyright (C) 2009-2011 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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#ifndef TYPE_RAID
# define TYPE_RAID 12
#endif

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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) {
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        VIR_DEBUG("udev reports device '%s' does not have property '%s'",
                  udev_device_get_sysname(udev_device), property_key);
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        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) {
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        VIR_DEBUG("udev reports device '%s' does not have sysfs attr '%s'",
                  udev_device_get_sysname(udev_device), attr_name);
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        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)
{
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    int ret = -1;
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    struct pci_id_match m;
    const char *vendor_name = NULL, *device_name = NULL;

    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;
        }
    }

    ret = 0;

out:
    return ret;
}


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static int udevProcessPCI(struct udev_device *device,
                          virNodeDeviceDefPtr def)
{
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    const char *syspath = NULL;
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    union _virNodeDevCapData *data = &def->caps->data;
    int ret = -1;
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    char *p;
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    syspath = udev_device_get_syspath(device);
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    if (udevGetUintProperty(device,
                            "PCI_CLASS",
                            &data->pci_dev.class,
                            16) == PROPERTY_ERROR) {
        goto out;
    }

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    p = strrchr(syspath, '/');
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    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;
    }

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    get_physical_function(syspath, data);
    get_virtual_functions(syspath, data);

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    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,
530
                            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(virNodeDeviceDefPtr def,
                           unsigned int type, char **typestring)
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{
    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;
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    case TYPE_RAID:
        *typestring = strdup("raid");
        break;
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    case TYPE_NO_LUN:
    default:
        foundtype = 0;
        break;
    }

    if (*typestring == NULL) {
        if (foundtype == 1) {
            ret = -1;
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            virReportOOMError();
750
        } else {
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            VIR_DEBUG("Failed to find SCSI device type %d for %s",
                      type, def->sysfs_path);
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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:
797
        if (udevGetSCSIType(def, tmp, &data->scsi.type) == -1) {
798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816
            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) {
817
        VIR_ERROR(_("Failed to process SCSI device with sysfs path '%s'"),
818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850
                  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;
}


851 852 853
static int udevProcessRemoveableMedia(struct udev_device *device,
                                      virNodeDeviceDefPtr def,
                                      int has_media)
854 855 856 857 858 859 860 861 862
{
    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;
    }

863
    if (has_media) {
864 865 866 867

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

868 869 870 871 872
        if (udevGetStringProperty(device, "ID_FS_LABEL",
                                  &data->storage.media_label) == PROPERTY_ERROR) {
            goto out;
        }

873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897
        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;
}

898 899 900 901 902 903 904 905 906 907 908 909 910 911
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) {
912
        virReportOOMError();
913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944
        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);
}
945 946 947 948 949 950 951 952 953

/* 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;

954 955 956
    VIR_DEBUG("Could not find definitive storage type for device "
              "with sysfs path '%s', trying to guess it",
              def->sysfs_path);
957 958 959 960 961 962 963 964 965 966

    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) {
967 968
        VIR_DEBUG("Could not determine storage type for device "
                  "with sysfs path '%s'", def->sysfs_path);
969 970
    } else {
        VIR_DEBUG("Found storage type '%s' for device "
971
                  "with sysfs path '%s'",
972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999
                  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;
1000
    const char* devnode;
1001

1002 1003
    devnode = udev_device_get_devnode(device);
    if(!devnode) {
1004
        VIR_DEBUG("No devnode for '%s'", udev_device_get_devpath(device));
1005 1006 1007
        goto out;
    }
    data->storage.block = strdup(devnode);
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 1034 1035 1036 1037 1038
    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) {
1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055
        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;
            }
1056 1057 1058 1059 1060 1061 1062
        }
    }

    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);
1063 1064
    } else if (STREQ(def->caps->data.storage.drive_type, "floppy")) {
        ret = udevProcessFloppy(device, def);
1065
    } else {
1066 1067
        VIR_DEBUG("Unsupported storage type '%s'",
                  def->caps->data.storage.drive_type);
1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088
        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
1089 1090
    VIR_DEBUG("Found device type '%s' for device '%s'",
              NULLSTR(devtype), udev_device_get_sysname(device));
1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106

    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
1107 1108 1109 1110 1111
    if (devtype != NULL && STREQ(devtype, "scsi_target")) {
        *type = VIR_NODE_DEV_CAP_SCSI_TARGET;
        goto out;
    }

1112 1113 1114 1115 1116 1117 1118 1119 1120 1121
    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
1122 1123 1124 1125 1126
    if (devtype != NULL && STREQ(devtype, "wlan")) {
        *type = VIR_NODE_DEV_CAP_NET;
        goto out;
    }

1127 1128 1129 1130 1131
    if (udevGetUintProperty(device, "PCI_CLASS", &tmp, 16) == PROPERTY_FOUND) {
        *type = VIR_NODE_DEV_CAP_PCI_DEV;
        goto out;
    }

D
David Allan 已提交
1132 1133 1134 1135
    /* 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. */
1136 1137 1138 1139 1140 1141 1142 1143 1144
    if (devtype == NULL &&
        udevGetStringProperty(device,
                              "INTERFACE",
                              &tmp_string) == PROPERTY_FOUND) {
        VIR_FREE(tmp_string);
        *type = VIR_NODE_DEV_CAP_NET;
        goto out;
    }

1145 1146 1147
    VIR_DEBUG("Could not determine device type for device "
              "with sysfs path '%s'",
              udev_device_get_sysname(device));
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 1174 1175 1176 1177 1178
    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
1179 1180 1181
    case VIR_NODE_DEV_CAP_SCSI_TARGET:
        ret = udevProcessSCSITarget(device, def);
        break;
1182 1183 1184 1185 1186 1187 1188
    case VIR_NODE_DEV_CAP_SCSI:
        ret = udevProcessSCSIDevice(device, def);
        break;
    case VIR_NODE_DEV_CAP_STORAGE:
        ret = udevProcessStorage(device, def);
        break;
    default:
1189
        VIR_ERROR(_("Unknown device type %d"), def->caps->type);
1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205
        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);
    dev = virNodeDeviceFindBySysfsPath(&driverState->devs, name);
1206

1207
    if (dev != NULL) {
1208
        VIR_DEBUG("Removing device '%s' with sysfs path '%s'",
1209 1210 1211
                  dev->def->name, name);
        virNodeDeviceObjRemove(&driverState->devs, dev);
    } else {
1212 1213
        VIR_DEBUG("Failed to find device to remove that has udev name '%s'",
                  name);
1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228
        ret = -1;
    }

    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;

1229 1230
    parent_device = device;
    do {
1231

1232 1233 1234 1235
        parent_device = udev_device_get_parent(parent_device);
        if (parent_device == NULL) {
            break;
        }
1236

1237 1238
        parent_sysfs_path = udev_device_get_syspath(parent_device);
        if (parent_sysfs_path == NULL) {
1239 1240
            VIR_DEBUG("Could not get syspath for parent of '%s'",
                      udev_device_get_syspath(parent_device));
1241 1242 1243 1244 1245 1246 1247
        }

        dev = virNodeDeviceFindBySysfsPath(&driverState->devs,
                                           parent_sysfs_path);
        if (dev != NULL) {
            def->parent = strdup(dev->def->name);
            virNodeDeviceObjUnlock(dev);
1248

1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264
            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) {
1265 1266 1267 1268
        def->parent = strdup("computer");
    }

    if (def->parent == NULL) {
1269
        virReportOOMError();
1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286
        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) {
1287
        virReportOOMError();
1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298
        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) {
1299
        virReportOOMError();
1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314
        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;
    }

1315 1316
    /* If this is a device change, the old definition will be freed
     * and the current definition will take its place. */
1317
    dev = virNodeDeviceAssignDef(&driverState->devs, def);
1318

1319
    if (dev == NULL) {
1320
        VIR_ERROR(_("Failed to create device for '%s'"), def->name);
1321 1322 1323 1324 1325 1326 1327 1328
        goto out;
    }

    virNodeDeviceObjUnlock(dev);

    ret = 0;

out:
1329 1330 1331 1332
    if (ret != 0) {
        virNodeDeviceDefFree(def);
    }

1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346
    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);
1347

1348 1349
    if (device != NULL) {
        if (udevAddOneDevice(device) != 0) {
1350 1351
            VIR_DEBUG("Failed to create node device for udev device '%s'",
                      name);
1352 1353 1354 1355
        }
        ret = 0;
    }

1356 1357
    udev_device_unref(device);

1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371
    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) {
1372
        VIR_ERROR(_("udev scan devices returned %d"), ret);
1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391
        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;

1392
    udevPrivate *priv = NULL;
1393 1394 1395 1396 1397
    struct udev_monitor *udev_monitor = NULL;
    struct udev *udev = NULL;

    if (driverState) {
        nodeDeviceLock(driverState);
1398 1399 1400 1401 1402 1403

        priv = driverState->privateData;

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

1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418
        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);
1419
        VIR_FREE(priv);
1420 1421 1422 1423
    } else {
        ret = -1;
    }

1424 1425 1426
    /* pci_system_cleanup returns void */
    pci_system_cleanup();

1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440
    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;

1441
    nodeDeviceLock(driverState);
1442 1443
    udev_fd = udev_monitor_get_fd(udev_monitor);
    if (fd != udev_fd) {
1444 1445
        VIR_ERROR(_("File descriptor returned by udev %d does not "
                    "match node device file descriptor %d"), fd, udev_fd);
1446 1447 1448 1449 1450
        goto out;
    }

    device = udev_monitor_receive_device(udev_monitor);
    if (device == NULL) {
1451
        VIR_ERROR0(_("udev_monitor_receive_device returned NULL"));
1452 1453 1454 1455
        goto out;
    }

    action = udev_device_get_action(device);
1456
    VIR_DEBUG("udev action: '%s'", action);
1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468

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

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

out:
1469
    udev_device_unref(device);
1470
    nodeDeviceUnlock(driverState);
1471 1472 1473 1474
    return;
}


1475 1476
static void
udevGetDMIData(union _virNodeDevCapData *data)
1477 1478 1479 1480 1481 1482
{
    struct udev *udev = NULL;
    struct udev_device *device = NULL;
    char *tmp = NULL;

    udev = udev_monitor_get_udev(DRV_STATE_UDEV_MONITOR(driverState));
1483

1484 1485
    device = udev_device_new_from_syspath(udev, DMI_DEVPATH);
    if (device == NULL) {
1486 1487
        device = udev_device_new_from_syspath(udev, DMI_DEVPATH_FALLBACK);
        if (device == NULL) {
1488
            VIR_ERROR(_("Failed to get udev device for syspath '%s' or '%s'"),
1489
                      DMI_DEVPATH, DMI_DEVPATH_FALLBACK);
1490 1491
            goto out;
        }
1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517
    }

    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;
    }

1518
    if (virGetHostUUID(data->system.hardware.uuid))
1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539
        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;
    }

1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571
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);
1572

1573
    dev = virNodeDeviceAssignDef(&driverState->devs, def);
1574
    if (dev == NULL) {
1575
        VIR_ERROR(_("Failed to create device for '%s'"), def->name);
1576 1577 1578 1579 1580 1581 1582 1583
        goto out;
    }

    virNodeDeviceObjUnlock(dev);

    ret = 0;

out:
1584 1585 1586 1587
    if (ret == -1) {
        virNodeDeviceDefFree(def);
    }

1588 1589 1590
    return ret;
}

1591
static int udevDeviceMonitorStartup(int privileged)
1592
{
1593
    udevPrivate *priv = NULL;
1594 1595
    struct udev *udev = NULL;
    int ret = 0;
1596 1597 1598
    int pciret;

    if ((pciret = pci_system_init()) != 0) {
1599 1600 1601 1602 1603 1604 1605 1606 1607 1608
        /* Ignore failure as non-root; udev is not as helpful in that
         * situation, but a non-privileged user won't benefit much
         * from udev in the first place.  */
        if (privileged || errno != EACCES) {
            char ebuf[256];
            VIR_ERROR(_("Failed to initialize libpciaccess: %s"),
                      virStrerror(pciret, ebuf, sizeof ebuf));
            ret = -1;
            goto out;
        }
1609
    }
1610

1611
    if (VIR_ALLOC(priv) < 0) {
1612
        virReportOOMError();
1613 1614 1615 1616 1617 1618
        ret = -1;
        goto out;
    }

    priv->watch = -1;

1619
    if (VIR_ALLOC(driverState) < 0) {
1620
        virReportOOMError();
1621
        VIR_FREE(priv);
1622 1623 1624 1625 1626
        ret = -1;
        goto out;
    }

    if (virMutexInit(&driverState->lock) < 0) {
1627
        VIR_ERROR0(_("Failed to initialize mutex for driverState"));
1628
        VIR_FREE(priv);
1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644
        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);

1645 1646 1647
    priv->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
    if (priv->udev_monitor == NULL) {
        VIR_FREE(priv);
1648
        VIR_ERROR0(_("udev_monitor_new_from_netlink returned NULL"));
1649
        ret = -1;
1650
        goto out_unlock;
1651 1652
    }

1653
    udev_monitor_enable_receiving(priv->udev_monitor);
1654 1655

    /* udev can be retrieved from udev_monitor */
1656
    driverState->privateData = priv;
1657 1658 1659 1660 1661 1662 1663 1664 1665

    /* 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.  */
1666 1667 1668 1669
    priv->watch = virEventAddHandle(udev_monitor_get_fd(priv->udev_monitor),
                                    VIR_EVENT_HANDLE_READABLE,
                                    udevEventHandleCallback, NULL, NULL);
    if (priv->watch == -1) {
1670
        ret = -1;
1671
        goto out_unlock;
1672 1673 1674 1675 1676
    }

    /* Create a fictional 'computer' device to root the device tree. */
    if (udevSetupSystemDev() != 0) {
        ret = -1;
1677
        goto out_unlock;
1678 1679 1680 1681 1682 1683
    }

    /* Populate with known devices */

    if (udevEnumerateDevices(udev) != 0) {
        ret = -1;
1684
        goto out_unlock;
1685 1686
    }

1687 1688 1689
out_unlock:
    nodeDeviceUnlock(driverState);

1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736
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
1737
    .name = "udev",
1738 1739 1740 1741 1742 1743 1744 1745
    .initialize = udevDeviceMonitorStartup,
    .cleanup = udevDeviceMonitorShutdown,
    .reload = udevDeviceMonitorReload,
    .active = udevDeviceMonitorActive,
};

int udevNodeRegister(void)
{
1746
    VIR_DEBUG0("Registering udev node device backend");
1747 1748 1749 1750 1751 1752 1753 1754

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

    return virRegisterStateDriver(&udevStateDriver);
}