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<!doctype html><html lang=zh-cn class=no-js><title>linux udev</title><meta charset=utf-8><meta name=robots content=index,nofollow><meta http-equiv=x-ua-compatible content="IE=edge,chrome=1"><meta http-equiv=x-dns-prefetch-control content=on><meta name=viewport content="width=device-width,initial-scale=1"><meta name=referrer content=origin-when-cross-origin><meta name=description content="https://www.cnblogs.com/fah936861121/p/6496608.html udevadm info -a -p $(udevadm info -q path -n /dev/sg2) Ubuntu之udev用法总结 一、udev简介 u即user space，dev是device，通过它的名字，我们就可以简"><meta name=author content=rinetd><meta name=google-site-verification content=ifeWsnNpU7w8vP3ii_Cjq-P9LKw3ngVitnMWv4XmJqk><link rel=canonical href=../../linux/linux-udev/><link rel=icon href=../../public/favicon.ico><link rel="shortcut icon" href=../../public/favicon.ico><link rel=stylesheet href=../../front/css/main.min.css><link href=https://cdn.bootcss.com/font-awesome/4.7.0/css/font-awesome.min.css rel=stylesheet><link 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~6min reading time |
<a href=https://gitlab.com/rinetd/blog/edit/master/linux/linux-udev.md target=_blank>Improve on <i class="fa fa-gitlab"></i></a><div class=clear></div><div class="entry themeform"><div class=entry-inner></br>原文链接：<a target=_blank href=../../linux/linux-udev/> linux udev</a><p><a href=https://www.cnblogs.com/fah936861121/p/6496608.html target=_blank>https://www.cnblogs.com/fah936861121/p/6496608.html</a><p><code>udevadm info -a -p $(udevadm info -q path -n /dev/sg2)</code><p>Ubuntu之udev用法总结<br>一、udev简介<br>u即user space，dev是device，通过它的名字，我们就可以简单了解到，它是一个和用户态相关的驱动设备管理机制。udev是一个针对2.6内核的文件系统。提供一种基于用户空间的动态设备节点管理和命名的解决方案。用于取代落后的devfs<p>udev与硬件平台无关，属于用户空间的进程，是一个后台程序，它脱离驱动层的关联，而建立在操作系统之上，只要修改配置文件使之生效，无需重启操 作系统，它需要sysfs的支持，当底层设备发生插拔的时候，底层驱动通过netlink发送事件(uevent)给udev后台程序，udev监听这些 事件，并在上层做相应的设备节点的创建，命名，权限控制等。<p>它有以下优点：<p>1.动态管理:当设备添加/删除时，udev的守护进程侦听到来自内核的uevent，以此添加或者删除/dev下的设备文件，所以，udev只为 已经连接的设备产生设备文件，而不会在/dev/下产生大量虚无的设备文件.在发生热插拔时，设备的变化的相关信息会输出到内核的/sys(sysfs文 件系统),udev利用sysfs的信息来进行相应的设备节点的管理<p>2.自定义命名规则:通过规则文件，udev在/dev/下为所有的设备定义了内核设备名称，比如/dev/sda,/dev/hda,/dev /fd(这些都是驱动层定义的设备名)等等。由于udev是在用户空间运行，Linux用户可以自己定义规则文件，产生标识性强的设备文件，比如/dev /boot_disk,/dev/root_disk,/dev/color_printer等等<p>3.设定设备的权限和所有者/组。同样在规则文件中，可以自己定义设备相关的权限和所有者/组。<br>(详细说明可以通过man udev查看)<br>2.2.4 udev 的值和可调用的替换操作符<p>在键值对中的键和操作符都介绍完了，最后是值 (value)。Linux 用户可以随意地定制 udev 规则文件的值。例如：my_root_disk, my_printer。同时也可以引用下面的替换操作符：<p>$kernel, %k：设备的内核设备名称，例如：sda、cdrom。<br>$number, %n：设备的内核号码，例如：sda3 的内核号码是 3。<br>$devpath, %p：设备的 devpath路径<br>$id, %b：设备在 devpath里的 ID 号。<br>$sysfs{file}, %s{file}：设备的 sysfs里 file 的内容。其实就是设备的属性值。<br>例如：$sysfs{size} 表示该设备 ( 磁盘 ) 的大小。<br>$env{key}, %E{key}：一个环境变量的值。<br>$major, %M：设备的 major 号。<br>$minor %m：设备的 minor 号<br>$result, %c：PROGRAM 返回的结果。<br>$parent, %P：父设备的设备文件名。<br>$root, %r：udev_root的值，默认是 /dev/<br>$tempnode, %N：临时设备名。<br>%%：符号 % 本身。<br>$$：符号 $ 本身。<p>###<br>/etc/udev/rules.d/<pre><code class=language-sh>SUBSYSTEMS==&quot;scsi&quot;,ATTR{vendor}==&quot;Generic&quot;,ATTR{max_sectors}==&quot;240&quot;,ATTR{max_sectors}=&quot;2048&quot;
KERNEL==&quot;sd[a-z]*&quot;, SUBSYSTEMS==&quot;usb&quot;, ATTRS{idProduct}==&quot;0769&quot;,ATTRS{idVendor}==&quot;05e3&quot;,RUN+=&quot;/bin/rm -fr /dev/%k&quot;
KERNEL==&quot;sg[0-9]&quot;, SUBSYSTEMS==&quot;usb&quot;, ATTRS{idProduct}==&quot;0769&quot;, ATTRS{idVendor}==&quot;05e3&quot;, MODE=&quot;0666&quot;, OPTIONS+=&quot;last_rule&quot;
</code></pre><p>OPTIONS选项<br>另外一个有用的赋值是OPTIONS列表. 不多的可用的选项有:<br>all_partitions - 为一个块设备创建所有可能的分区, 而不是初始检测到的那些分区.<br>ignore_device - 完全忽略事件.<br>last_rule - 确保后面的所有规则不会有效.<br>例如, 下面规则设置我的硬盘节点的组所有权,并且后面的规则对它没有任何效果:<br>KERNEL==&quot;sda&quot;, GROUP=&quot;disk&quot;, OPTIONS+=&quot;last_rule&quot;<h3 id=1-利用udev自动挂载usb设备>1.利用udev自动挂载usb设备</h3><pre><code class=language-sh>KERNEL!=&quot;sd[b-z]?&quot;, GOTO=&quot;automount_exit&quot;
# 检测add事件
ACTION==&quot;add&quot;, SUBSYSTEM==&quot;block&quot;, RUN+=&quot;/bin/mkdir /media/%E{ID_FS_LABEL}-%E{ID_FS_UUID}&quot;, RUN+=&quot;/bin/mount -o uid=1000,user,codepage=936,utf8 $root/%k /media/%E{ID_FS_LABEL}-%E{ID_FS_UUID}&quot;
ACTION==&quot;remove&quot;, SUBSYSTEM==&quot;block&quot;, RUN+=&quot;/bin/umount /media/%E{ID_FS_LABEL}-%E{ID_FS_UUID}&quot;, RUN+=&quot;/bin/rmdir /media/%E{ID_FS_LABEL}-%E{ID_FS_UUID}&quot;
LABEL=&quot;automount_exit&quot;
</code></pre><p>保存为 /etc/udev/rules.d/ 下的某个文件。<p>第一行用 glob 跳过名称非 sd[b-z]? 字样的。<p>%E{ID_FS_LABEL} 是卷标，%E{ID_FS_UUID} 是 UUID，<br>第二行就是检测 add 事件，先根据卷标和 UUID 在 /media/下创建一个目录然后挂载。<p>第三行是相应的卸载命令。<h3 id=二-udev使用例子-解决多个设备插拔造成设备号变化的问题>二、udev使用例子，解决多个设备插拔造成设备号变化的问题</h3><p>Ubuntu连接多个设备，或这重复插拔设备的时候，识别出的设备号会变化。例如反复插U盘，识别出的设备号可能是/dev/sdb,/dev/sdc,/dev/sdd…(硬盘始终是/dev/sda)<br>网上之前的博客中可以利用udev直接修改U盘等设备的设备号，尝试了一下会出错，百度发现是udev后续版本去掉了这个功能。<br>目前思路是建立设备的链接，固定链接的名称，后续可以通过固定的链接（link）来操作设备。步骤如下：<p>1.先插入U盘，通过sudo fdisk -l 观察到的U盘信息如下：<pre><code>Device Boot Start End Sectors Size Id Type
/dev/sdd1 256 56062207 56061952 26.8G c W95 FAT32 (LBA)
/dev/sdd4 * 56062208 60062499 4000292 1.9G 16 Hidden FAT16
</code></pre><p>（这里看到U盘的Boot分区分配了1.9G，不科学啊）<p>2.编写Udev配置文件<br>udev的配置文件在/etc/udev下面<p>/etc/udev/rules.d/$ ls<br>hwdb.d rules.d udev.conf<p>其中udev.conf是udev默认的配置文件。<br>用户自定义的配置文件在rules.d文件下。<br>在rules.d目录下新建10-usb.rules。其中内容如下：<p>ACTIONS==&quot;add&quot;,KERNEL==&quot;sdd1&quot;,SUBSYSTEMS==&quot;block&quot;,SYMLINK+=&quot;USB1_link&quot;<p>简单介绍一下上面的语法：<br>Udev中，双等号为判断，+=，：=，=均为“赋值操作”。<br>以上有三个判断条件：<br>ACTIONS==“add”——插入设备<br>KERNEL==“sdd4”——设备号为/dev/sdd4<br>SUBSYSTEMS==“block”——设备类型为“块设备”<br>如果满足上述三个条件，则将创建此设备的软链接USB1_link.<p>3.Kernel和subsystems查询方法<br>其中kernel和subsystems信息，可以通过udevadm命令查询<br>例如，如下命令查询sdd的U盘信息<p><code>udevadm info -a -p /sys/block/sdd</code><p>其中sdd的信息如下(可以查询到sdd的Kernel和SUBSYSTEM信息)：<p>looking at device '/devices/pci0000:00/0000:00:14.0/usb3/3-7/3-7:1.0/host6/target6:0:0/6:0:0:0/block/sdd':<pre><code>KERNEL==&quot;sdd&quot;
SUBSYSTEM==&quot;block&quot;
DRIVER==&quot;&quot;
...
</code></pre><p>我们需要知道的是sdd1（U盘中的具体盘符的信息）,需要通过如下方法获取。<br>下列命令获取sdd1设备的设备目录<p><code>udevadm info -q path -n /dev/sdd1</code><p>输出如下：<p>/devices/pci0000:00/0000:00:14.0/usb3/3-7/3-7:1.0/host6/target6:0:0/6:0:0:0/block/sdd/sdd1<p>将上面的一串作为早先udevadm info -a -p命令的输入路径，即这样写：<p><code>udevadm info -a -p $(udevadm info -q path -n /dev/sdd1)</code><p>输出最开头的结果路下：<p>looking at device '/devices/pci0000:00/0000:00:14.0/usb3/3-7/3-7:1.0/host6/target6:0:0/6:0:0:0/block/sdd/sdd1':<pre><code>KERNEL==&quot;sdd1&quot;
SUBSYSTEM==&quot;block&quot;
DRIVER==&quot;&quot;
...
</code></pre><p>4.使得udev文件生效的方法<br>通常，使得配置后的文件生效，需要采用热插拔的方法更新udev规则，不过有更简单的方法如下：<p><code>sudo udevadm test /sys/class/block/sdd1</code><br>1<br>结果如图<p>/etc/udev/rules.d$ ls -al /dev/USB1*<br>lrwxrwxrwx 1 root root 4 12月 14 09:51 /dev/USB1_link -&gt; sdd1<p>5.其他注意事项<br>1.如果在10-usb.rules中加入语句NAME+=“string”，则执行更新命令的时候，会有如下error：<p>NAME=&quot;lzy_USB3&quot; ignored, kernel device nodes can not be renamed; please fix it in /etc/udev/rules.d/10-local.rules:1<p>经查是udev后续版本不再支持直接修改设备号。<p>2.本例子中udev的设备是通过设备号sdd1来识别的，其实该设备号每次插拔的时候都有变化，可以设置其他参数匹配对应的硬件，来保证对应设备接入之后，生成对应的硬件。<p>参考博客<br>[1] <a href=https://blog.csdn.net/fjb2080/article/details/4876314 target=_blank>https://blog.csdn.net/fjb2080/article/details/4876314</a><br>[2] <a href=http://www.cnblogs.com/cslunatic/p/3171837.html target=_blank>http://www.cnblogs.com/cslunatic/p/3171837.html</a><h2 id=3-https-blog-csdn-net-qq-29729577-article-details-50825134>[3]<a href=https://blog.csdn.net/qq_29729577/article/details/50825134 target=_blank>https://blog.csdn.net/qq_29729577/article/details/50825134</a></h2><p>版权声明：本文为CSDN博主「lzylzy112233」的原创文章，遵循CC 4.0 by-sa版权协议，转载请附上原文出处链接及本声明。<br>原文链接：<a href=https://blog.csdn.net/lzylzy112233/article/details/84997466 target=_blank>https://blog.csdn.net/lzylzy112233/article/details/84997466</a></div><div class=clear></div></div></div></article><div class=clear></div><p class=post-tags><span class="fa fa-tags">Tags:</span>
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