{"id":4468,"date":"2015-02-17T18:26:26","date_gmt":"2015-02-17T10:26:26","guid":{"rendered":"http:\/\/edsionte.com\/techblog\/?p=4468"},"modified":"2015-09-07T20:35:26","modified_gmt":"2015-09-07T12:35:26","slug":"open%e5%9c%a8linux%e5%86%85%e6%a0%b8%e7%9a%84%e5%ae%9e%e7%8e%b04-%e5%92%8c-%e7%9a%84%e5%a4%84%e7%90%86","status":"publish","type":"post","link":"http:\/\/edsionte.com\/techblog\/archives\/4468","title":{"rendered":"open()\u5728Linux\u5185\u6838\u7684\u5b9e\u73b0(3)-\u201c.\u201d\u548c\u201c..\u201d\u7684\u5904\u7406"},"content":{"rendered":"<h2>1.\u57fa\u672c\u8bf4\u660e<\/h2>\n<p>open()\u5728\u5185\u6838\u7684\u5b9e\u73b0\u8fc7\u7a0b\u4e2d\uff0c\u6709\u4e00\u5927\u90e8\u5206\u5de5\u4f5c\u90fd\u662f\u8def\u5f84\u67e5\u627e\u3002\u8def\u5f84\u67e5\u627e\u5373\u5bf9\u7528\u6237\u6001\u4f20\u5165\u7684\u6587\u4ef6\u8def\u5f84\u4ee5\u76ee\u5f55\u9879\u4e3a\u5355\u4f4d\u8fdb\u884c\u4f9d\u6b21\u904d\u5386\u3002\u76ee\u5f55\u9879\u5305\u542b\u4e94\u79cd\u7c7b\u578b\uff0c\u5f53\u76ee\u5f55\u9879\u4e3a\u201d.\u201d\uff08LAST_DOT\uff09\u6216\u8005\u201c..\u201d(LAST_DOTDOT)\uff0c\u90a3\u4e48walk_component()\u5c06\u901a\u8fc7handle_dots()\u5bf9\u5176\u8fdb\u884c\u5904\u7406\u3002<\/p>\n<p>\u5b9e\u9645\u4e0a\uff0c\u5982\u679c\u5f53\u524d\u76ee\u5f55\u9879\u4e3a\u201c.\u201d\uff0c\u90a3\u4e48\u8be5\u51fd\u6570\u4ec0\u4e48\u4e5f\u4e0d\u505a\u76f4\u63a5\u8fd4\u56de\uff08\u8fd4\u56de\u5230link_path_walk\u4e2d\uff09\u5373\u53ef\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5982\u679c\u5f53\u524d\u76ee\u5f55\u9879\u4e3a\u201d.\u201d\uff0c\u90a3\u4e48walk_component()\u6b64\u65f6\u7684\u4f5c\u7528\u5c31\u662f\u201c\u8d8a\u8fc7\u201d\u8fd9\u4e9b\u5f53\u524d\u76ee\u5f55\uff0c\u800cnd\u4fe1\u606f\u4e0d\u505a\u6539\u53d8\uff0c\u56e0\u4e3a\u6240\u6709\u201c.\u201d\u4e4b\u524d\u7684\u666e\u901a\u76ee\u5f55\u9879\u5df2\u7ecf\u66f4\u65b0\u4e86nd\u3002\u6bd4\u5982\/home\/edsionte\/.\/.\/.\/doc\uff0c\u76ee\u5f55\u9879edsionte\u4e4b\u540e\u7684\u201c.\u201d\u5bf9\u5e94\u7684nd\u4e0eedsionte\u76ee\u5f55\u9879\u76f8\u540c\uff0c\u56e0\u6b64walk_component()\u5728\u9047\u5230\u201c.\u201d\u65f6\u76f4\u63a5\u8d8a\u8fc7\u4ed6\u4eec\uff0c\u8fdb\u800c\u5904\u7406doc\u76ee\u5f55\u9879\u3002<\/p>\n<p>\u5982\u679c\u5f53\u524d\u76ee\u5f55\u9879\u4e3a\u201c..\u201d\uff0c\u5373\u5f53\u524d\u8981walk\u7684\u76ee\u5f55\u9879\u4e3a\u4e0a\u4e00\u6b21\u5df2\u7ecfwalk\u7684\u76ee\u5f55\u9879\u7684\u7236\u76ee\u5f55\uff0c\u4e5f\u5c31\u662f\u9700\u8981\u5411\u4e0a\u83b7\u53d6\u5f53\u524d\u76ee\u5f55\u7684\u7236\u76ee\u5f55\u3002<\/p>\n<h2>2.\u51fd\u6570\u5b9e\u73b0<\/h2>\n<h3>2.1.handle_dots()<\/h3>\n<p>\u8be5\u51fd\u6570\u7684\u5b9e\u73b0\u6bd4\u8f83\u7b80\u5355\uff0c\u5185\u90e8\u6839\u636e\u5f53\u524d\u7684walk\u7c7b\u578b\u505a\u4e86\u51fd\u6570\u5206\u53d1\u3002<\/p>\n<pre class=\"brush: cpp; title: ; notranslate\" title=\"\">\r\nstatic inline int handle_dots(struct nameidata *nd, int type);\r\n<\/pre>\n<p>\u5982\u679c\u5f53\u524d\u641c\u7d22\u8def\u5f84\u7684\u6a21\u5f0f\u4f4drcu\uff0c\u5219\u8fdb\u5165follow_dotdot_rcu()\u7684\u6d41\u7a0b\uff1b\u5426\u5219\u8fdb\u5165follow_dotdot()\u7684\u6d41\u7a0b\u3002<\/p>\n<h3>2.2.follow_dotdot_rcu()<\/h3>\n<p>\u8be5\u51fd\u6570\u7684\u58f0\u660e\u5982\u4e0b\uff1a<\/p>\n<pre class=\"brush: cpp; title: ; notranslate\" title=\"\">\r\nstatic int follow_dotdot_rcu(struct nameidata *nd);\r\n<\/pre>\n<p>\u8be5\u51fd\u6570\u662f\u5728rcu\u6a21\u5f0f\u4e0b\u83b7\u53d6\u7236\u76ee\u5f55\u9879\u4fe1\u606f\uff0c\u5982\u679c\u641c\u7d22\u6210\u529f\uff0c\u5219\u8fd4\u56de0\uff1b\u5426\u5219\uff0c\u8fd4\u56deECHILD\uff0c\u4e5f\u5c31\u662f\u8bf4\u9700\u8981\u5207\u6362\u5230ref-walk\u65b9\u5f0f\u4e0b\u8fdb\u884c\u641c\u7d22\u8def\u5f84\u3002\u8be5\u51fd\u6570\u7684\u4e3b\u8981\u5904\u7406\u8fc7\u7a0b\u5982\u4e0b\uff1a<\/p>\n<p>1.\u5982\u679c\u6709\u9700\u8981\u7684\u8bdd\uff0c\u9996\u5148\u901a\u8fc7set_root_rcu()\u8bbe\u7f6e\u5f53\u524d\u8def\u5f84\u7684\u6839\u76ee\u5f55\u4fe1\u606f\u3002\u53ef\u4ee5\u5728path_init()\u4e2d\u83b7\u77e5\uff0c\u53ea\u6709\u641c\u7d22\u8def\u5f84\u662f\u7edd\u5bf9\u8def\u5f84\uff0cnd\u4e2d\u7684root\u624d\u4f1a\u5728\u4e00\u5f00\u59cb\u5c31\u88ab\u8bbe\u7f6e\uff1b\u5426\u5219\uff0c\u6bd4\u5982\u662f\u76f8\u5bf9\u8def\u5f84\uff0c\u90a3\u4e48\u8fd9\u91cc\u5c31\u5fc5\u987b\u5bf9\u6839\u76ee\u5f55\u8fdb\u884c\u8bbe\u7f6e\u4e86\u3002\u56e0\u4e3a\u6b64\u5904\u662f\u5411\u4e0a\u641c\u7d22\uff0c\u53ef\u80fd\u4f1a\u4e00\u76f4\u627e\u5230\u6839\u76ee\u5f55\u5904\u3002<\/p>\n<p>2.\u8fdb\u5165\u5faa\u73af\u4f53\uff0c\u5411\u4e0a\u83b7\u53d6\u5f53\u524d\u76ee\u5f55\u9879\u7684\u7236\u76ee\u5f55\u9879\u3002\u901a\u8fc7\u60c5\u51b5\u4e0b\uff0c\u8fd9\u4e2a\u5faa\u73af\u4f53\u53ea\u4f1a\u88ab\u6267\u884c\u4e00\u6b21\u5373\u9000\u51fa\uff0c\u53ea\u6709\u5f53\u7236\u76ee\u5f55\u9879\u4e3a\u4e00\u4e2a\u6302\u8f7d\u70b9\u65f6\u624d\u6709\u53ef\u80fd\u4e0d\u65ad\u8fdb\u884c\u5faa\u73af\u3002<\/p>\n<p>3.\u5982\u679c\u9000\u51fa\u5faa\u73af\u4f53\uff0c\u81f3\u6b64\u5df2\u7ecf\u83b7\u53d6\u5230\u4e86\u5f53\u524d\u76ee\u5f55\u9879\u7684\u4e0a\u4e00\u7ea7\u76ee\u5f55\u9879\uff08\u5373\u201c..\u201d\u6240\u4ee3\u8868\u7684\u7236\u76ee\u5f55\u9879\uff09\u3002<\/p>\n<p>4.\u5982\u679c\u8fd9\u4e2a\u7236\u76ee\u5f55\u9879\u662f\u4e00\u4e2a\u6302\u8f7d\u70b9\uff0c\u90a3\u4e48\u8fd8\u9700\u505a\u4e00\u4e9b\u7279\u6b8a\u68c0\u67e5\u3002\u56e0\u4e3a\u5728\u7279\u6b8a\u60c5\u51b5\u4e0b\uff0c\u5f53\u524d\u8fd9\u4e2a\u7236\u76ee\u5f55\u9879\u53c8\u88ab\u6302\u8f7d\u4e86\u5176\u4ed6\u7684\u6587\u4ef6\u7cfb\u7edf\uff0c\u90a3\u4e48\u8fd4\u56de\u4e0a\u7ea7\u76ee\u5f55\u8fd9\u4e2a\u64cd\u4f5c\u83b7\u53d6\u7684\u5e94\u8be5\u662f\u6700\u65b0\u6587\u4ef6\u7cfb\u7edf\u7684\u5185\u5bb9\u800c\u4e0d\u662f\u4e4b\u524d\u90a3\u4e2a\u6587\u4ef6\u7cfb\u7edf\u7684\u5185\u5bb9\u3002\u901a\u8fc7__lookup_mnt()\u68c0\u67e5\u7236\u76ee\u5f55\u4e0b\u6302\u8f7d\u7684\u6587\u4ef6\u7cfb\u7edf\u662f\u5426\u4e3a\u6700\u65b0\u7684\u6587\u4ef6\u7cfb\u7edf\uff0c\u5982\u679c\u662f\u5219\u68c0\u67e5\u7ed3\u675f\uff1b\u5426\u5219\uff0c\u5c06\u7ee7\u7eed\u68c0\u67e5\uff1b<\/p>\n<p>5.\u66f4\u65b0nd\u4e2d\u7684inode\uff0c\u5e76\u8fd4\u56de\uff1b<\/p>\n<p>\u5728\u5faa\u73af\u4f53\u4e2d\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0\u4e09\u79cd\u60c5\u51b5\uff1a<\/p>\n<p>a.\u5982\u679c\u5f53\u524d\u76ee\u5f55\u9879\u6070\u597d\u4e3a\u6839\u76ee\u5f55\u76ee\u5f55\u9879\uff0c\u5219\u76f4\u63a5\u8df3\u51fa\u5faa\u73af\uff1b\u6bd4\u5982\u5728\u6839\u76ee\u5f55\u4e0b\u6267\u884c\u201ccd ..\/..\/..\/\u201d;<\/p>\n<p>b.\u5982\u679c\u5f53\u524d\u76ee\u5f55\u9879\u65e2\u4e0d\u662f\u6839\u76ee\u5f55\uff0c\u4e5f\u4e0d\u662f\u4e00\u4e2a\u6302\u8f7d\u70b9\uff0c\u5219\u5c5e\u4e8e\u6700\u666e\u901a\u7684\u60c5\u51b5\uff0c\u5373\u76f4\u63a5\u83b7\u53d6\u5f53\u524d\u76ee\u5f55\u9879\u7684\u7236\u76ee\u5f55\u9879\u3002\u65b9\u6cd5\u5f88\u7b80\u5355\uff0c\u76f4\u63a5\u7528\u5f53\u524d\u76ee\u5f55\u9879\u7684parent\uff08nd-&gt;path.dentry-&gt;d_parent\uff09\u8986\u76d6\u5f53\u524d\u7684nd\u7ed3\u6784\u4e2d\u7684path.dentry\u5373\u53ef\uff1b<\/p>\n<p>c.\u5982\u679c\u5f53\u524d\u76ee\u5f55\u9879\u4ee3\u8868\u7684\u662f\u5f53\u524d\u6587\u4ef6\u7cfb\u7edf\u7684\u6839\u76ee\u5f55\uff0c\u5219\u4e0d\u80fd\u901a\u8fc7\u7b80\u5355\u7684\u83b7\u53d6\u5f53\u524d\u76ee\u5f55\u9879parent\u8fd9\u79cd\u65b9\u6cd5\uff0c\u56e0\u4e3a\u83b7\u53d6\u7684parent\u4e3a\u201c\/\u201d\uff08\u5f53\u7136\u6307\u7684\u662f\u5f53\u524d\u6587\u4ef6\u7cfb\u7edf\u7684\u6839\u76ee\u5f55\uff09\u3002\u6b64\u65f6\u9700\u8981\u901a\u8fc7follow_up_rcu()\u5bf9nd-&gt;path\u8fdb\u884c\u586b\u5145\u3002\u5982\u679cfollow_up_rcu()\u8fd4\u56de1\uff0c\u5219\u5faa\u73af\u7ee7\u7eed\uff1b\u8fd4\u56de0\uff0c\u5219\u7ed3\u675f\u5faa\u73af\uff1b<\/p>\n<h3>2.3.follow_up_rcu()<\/h3>\n<p>\u5982\u679c\u201c..\u201d\u6240\u4ee3\u8868\u7684\u76ee\u5f55\u9879\u6b63\u597d\u662f\u4e00\u4e2a\u6302\u8f7d\u70b9\u65f6\uff0c\u90a3\u4e48\u9700\u8981\u5c06\u5f53\u524d\u7684\u904d\u5386\u4ece\u5f53\u524d\u7684\u6587\u4ef6\u7cfb\u7edf\u5411\u4e0a\uff08follow up\uff09\u5207\u6362\u5230\u7236\u6587\u4ef6\u7cfb\u7edf\u3002\u8be5\u51fd\u6570\u7684\u58f0\u660e\u5982\u4e0b\uff1a<\/p>\n<pre class=\"brush: cpp; title: ; notranslate\" title=\"\">\r\nstatic int follow_up_rcu(struct path *path);\r\n<\/pre>\n<p>\u65e2\u7136\u662f\u5411\u4e0a\u8de8\u8d8a\u5230\u7236\u6587\u4ef6\u7cfb\u7edf\uff0c\u90a3\u4e48\u9996\u5148\u5c06\u7236\u6587\u4ef6\u7cfb\u7edf\u7684\u6302\u8f7d\u70b9\u5bf9\u5e94\u7684dentry\uff08nd-&gt;path-&gt;mnt-&gt;mnt_mountpoint\uff09\u8d4b\u503c\u7ed9\u5f53\u524dnd\u4e2d\u5bf9\u5e94\u7684dentry\uff08nd-&gt;path-&gt;dentry\uff09\u3002\u56e0\u4e3a\u8fd9\u4e2a\u6302\u8f7d\u70b9\u4e5f\u5c31\u662f\u201c..\u201d\u5bf9\u5e94\u7684\u76ee\u5f55\u9879\uff0c\u6302\u8f7d\u70b9\u672c\u8d28\u4e5f\u5c31\u662f\u4e2a\u76ee\u5f55\u3002<\/p>\n<p>\u5176\u6b21\uff0c\u5c06\u7236\u6587\u4ef6\u7cfb\u7edf\u7684vfsmount\u7ed3\u6784\uff08nd-&gt;path-&gt;mnt-&gt;mnt_parent\uff09\u590d\u5236\u7ed9\u5f53\u524dnd\u4e2d\u5bf9\u5e94\u7684mnt\u9879\uff08nd-&gt;path-&gt;mnt\uff09\u3002<\/p>\n<p>\u901a\u8fc7\u4ee5\u4e0a\u4e24\u4e2a\u6b65\u9aa4\uff0c\u5373\u5c06\u5f53\u524d\u7684walk\u4f4d\u7f6e\u5411\u4e0a\u79fb\u52a8\u5230\u7236\u6587\u4ef6\u7cfb\u7edf\u4e2d\u7684\u4e00\u4e2a\u76ee\u5f55\u4e0a\u3002<\/p>\n<p>\u4e0b\u9762\u901a\u8fc7\u4e3e\u4f8b\u8bf4\u660e\u4e0a\u8ff0\u8fc7\u7a0b\u3002\u5047\u8bbe\u5b58\u5728\u8def\u5f84\/home\/edsionte\/work\uff0c\u5176\u4e2dfs1\u6587\u4ef6\u7cfb\u7edf\u4e0b\u6709\u76ee\u5f55\/home\/edsionte\/work\uff0c\u6587\u4ef6\u7cfb\u7edffs2\u6302\u8f7d\u5728work\u76ee\u5f55\u4e0b\uff0c\u5373fs2\u7684\u6302\u8f7d\u70b9\u4e3awork\u3002\u5047\u8bbework\u4e0b\u6709\u6587\u4ef6w1\u548cfile\uff0c\u5728\/home\/edsionte\/work\/file\u76ee\u5f55\u4e0b\uff0c\u7528\u6237\u8bbf\u95ee\u7684\u8def\u5f84\u4e3a\u201c..\/w1\u201d\uff0c\u5219\u201c..\u201d\u5bf9\u5e94\u7684dentry\u5373\u4e3afs2\u6587\u4ef6\u7cfb\u7edf\u6839\u76ee\u5f55\uff0c\u5219\u9700\u8981\u8de8\u8d8a\u5230fs1\u6587\u4ef6\u7cfb\u7edf\u4e2d\u3002\u201c\u8de8\u8d8a\u201d\u64cd\u4f5c\u9996\u5148\u662f\u5c06\u5f53\u524ddentry\u6307\u5411work\uff0c\u4e5f\u5c31\u662f\u4e0b\u6b21\u5c06\u8981\u5728work\u76ee\u5f55\u4e0b\u5bfb\u627ew1\u6587\u4ef6\uff1b\u5176\u6b21\uff0c\u9700\u8981\u6539\u53d8\u5f53\u524d\u6587\u4ef6\u7cfb\u7edf\u72b6\u6001\uff0c\u5373\u901a\u8fc7\u66ff\u6362vfsmount\u6765\u4f53\u73b0\u3002<\/p>\n<p>\u5b8c\u6210\u4ee5\u4e0a\u64cd\u4f5c\uff0c\u5c06\u8fd4\u56de1\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5fc5\u987b\u518d\u8fdb\u884c\u4e00\u6b21follow_dotdot_rcu()\u4e2d\u7684\u5faa\u73af\u8fc7\u7a0b\uff0c\u56e0\u4e3afollow_up_rcu()\u5b8c\u6210\u7684\u53ea\u662f\u6587\u4ef6\u7cfb\u7edf\u7684\u8de8\u8d8a\uff0c\u8de8\u8d8a\u5b8c\u6bd5\u540e\u5fc5\u987b\u8fdb\u884cfollow_dotdot_rcu()\u4e2d\u7684\u5faa\u73af\u4f53\u5de5\u4f5c\u3002<\/p>\n<p>\u66f4\u7279\u6b8a\u7684\u662f\uff0c\u8de8\u8d8a\u6587\u4ef6\u7cfb\u7edf\u4e4b\u540e\u7684\u8fd9\u4e2a\u76ee\u5f55\u9879\u5f88\u53ef\u80fd\u53c8\u662f\u4e00\u4e2a\u6302\u8f7d\u70b9\uff0c\u90a3\u4e48\u53c8\u5fc5\u987b\u8fdb\u5165follow_up_rcu()\u4e2d\u6267\u884c\u4e0a\u8ff0\u64cd\u4f5c\u3002\u53ea\u6709\u5f53\u5f53\u524d\u6587\u4ef6\u7cfb\u7edf\u7684\u6302\u8f7d\u70b9\u5c31\u662f\u81ea\u5df1\u7684\u65f6\u5019\uff0c\u5373\u8de8\u8d8a\u5230\u6839\u6587\u4ef6\u7cfb\u7edf\u7684\u65f6\u5019\uff0c\u8be5\u51fd\u6570\u8fd4\u56de0\uff0c\u90a3\u4e48\u8fd4\u56de\u5230\u4e0a\u7ea7\u51fd\u6570follow_dotdot_rcu()\u4e2d\u7684\u5faa\u73af\u4f53\u65f6\uff0c\u4e5f\u5c06\u7ed3\u675f\u6574\u4e2a\u5faa\u73af\u8fc7\u7a0b\u3002<\/p>\n<p>\u4e0b\u9762\u518d\u901a\u8fc7\u4e3e\u4f8b\u8bf4\u660efollow_dotdot_rcu()\u4e2d\u5faa\u73af\u4f53\u53cd\u590d\u6267\u884c\u7684\u4f8b\u5b50\u3002\u5047\u8bbefs1\u6587\u4ef6\u7cfb\u7edf\u5b58\u5728\u8def\u5f84\/home\/edsionte\/work\uff0c\u9996\u5148\u5c06fs2\u6587\u4ef6\u7cfb\u7edf\u6302\u8f7d\u4e8ework\u4e0b\uff0c\u518d\u5c06fs3\u6302\u8f7d\u5728work\u4e0b\uff0c\u90a3\u4e48\u6b64\u65f6fs3\u5bf9\u5e94\u7684\u7236vfsmount\u4e3afs2\u5bf9\u5e94\u7684\u7ed3\u6784\uff1b\u518d\u5c06fs4\u6587\u4ef6\u7cfb\u7edf\u6302\u8f7d\u5728wrok\u4e0b\uff0c\u90a3\u4e48fs4\u6307\u5411fs3\u3002\u6b64\u523b\uff0c\/home\/edsionte\/work\u53ef\u4ee5\u8bbf\u95eefs4\u7684\u5185\u5bb9\uff0c\u800c\u5176\u4ed6\u4e4b\u524d\u6302\u8f7d\u5728\u8fd9\u91cc\u7684\u6587\u4ef6\u7cfb\u7edf\u5c06\u88ab\u9690\u85cf\u3002\u5047\u8bbe\u7528\u6237\u5728wrok\u76ee\u5f55\u4e0b\u6267\u884c\u201ccd ..\/\u201d\uff0c\u7528\u6237\u60f3\u5f97\u5230\u7684\u7ed3\u679c\u662ffs1\u6587\u4ef6\u7cfb\u7edf\u4e0bedsionte\/\u4e0b\u7684\u5185\u5bb9\u3002\u800c\u6b64\u523bwork\u4f4d\u4e8efs4\u4e2d\uff0c\u90a3\u4e48\u4ed6\u5fc5\u987b\u5411\u4e0a\u9010\u6b65\u8de8\u8d8a\u6587\u4ef6\u7cfb\u7edf\uff0c\u5373fs4\u901a\u8fc7follow_up_rcu()\u8de8\u8d8a\u5230\u7236\u6587\u4ef6\u7cfb\u7edffs3\uff0cfs3\u518d\u8de8\u8d8a\u5230fs2\uff0cfs2\u518d\u8de8\u8d8a\u5230fs1\u3002<\/p>\n<h3>2.4.follow_dotdot()<\/h3>\n<p>follow_dotdot()\u548cfollow_dotdot_rcu()\u7684\u5b9e\u73b0\u65b9\u5f0f\u51e0\u4e4e\u4e00\u81f4\uff0c\u53ea\u4e0d\u8fc7\u8be5\u51fd\u6570\u5728\u5185\u90e8\u5b9e\u73b0\u4e0a\u4f7f\u7528\u4e86\u8bfb\u5199\u9501\u3002\u5177\u4f53\u7684\uff0c\u4e3b\u8981\u4f53\u73b0\u5728follow_up()\u548cfollow_mount()\u4e24\u4e2a\u51fd\u6570\u7684\u5185\u90e8\uff0c\u5b83\u4eec\u7684\u5b9e\u73b0\u8fc7\u7a0b\u4e2d\u5747\u4f7f\u7528\u4e86\u8bfb\u5199\u9501\uff0c\u8fd9\u5728rcu-walk\u4e2d\u662f\u4e0d\u5141\u8bb8\u7684\u3002<\/p>\n<h2>3.\u603b\u7ed3<\/h2>\n<p>\u672c\u6587\u9488\u5bf9open()\u5728\u5185\u6838\u4e2d\u7684\u8def\u5f84\u67e5\u627e\u8fc7\u7a0b\u8fdb\u884c\u7b80\u5355\u8bf4\u660e\uff0c\u5e76\u96c6\u4e2d\u5173\u6ce8\u4e86\u201c..\u201d\u8fd9\u4e2a\u7279\u6b8a\u7684\u76ee\u5f55\u9879\u3002LAST_DOTDOT\u7c7b\u578b\u7684\u76ee\u5f55\u9879\u4e4b\u6240\u4ee5\u7279\u6b8a\u662f\u7531\u4e8e\u5b83\u5411\u4e0a\uff08follow up\uff09\u7684\u67e5\u627e\u8fc7\u7a0b\u4e0e\u5f53\u524d\u6240\u4f4d\u4e8e\u7684\u8def\u5f84\u67e5\u627e\u8fc7\u7a0b\uff08\u5411\u4e0b\uff0cfollow down\uff09\u76f8\u53cd\uff0c\u540c\u65f6\u8fd8\u4f1a\u6d89\u53ca\u5230\u6587\u4ef6\u7cfb\u7edf\u6302\u8f7d\u70b9\u3002\u5982\u679c\u60a8\u60f3\u4e86\u89e3\u5176\u4ed6\u7c7b\u578b\u76ee\u5f55\u9879\u7684\u67e5\u627e\u8fc7\u7a0b\uff0c\u53ef\u4ee5\u9605\u8bfb\u672c\u7cfb\u5217\u5176\u4ed6\u6587\u7ae0\u3002<\/p>\n<p><strong>\u53c2\u8003\u8d44\u6599\uff1a<\/strong><\/p>\n<p><strong>1.Linux\u6e90\u78013.2.69\uff1b<\/strong><\/p>\n<p><strong>2.Linux\u7cfb\u7edf\u8c03\u7528open\u4e03\u65e5\u6e38\uff1ahttp:\/\/blog.chinaunix.net\/uid-20522771-id-4419666.html<\/strong><\/p>\n<p><strong>3.\u6df1\u5165\u7406\u89e3Linux\u5185\u6838\uff1ahttp:\/\/book.douban.com\/subject\/2287506\/\uff1b<\/strong><\/p>\n<p><strong>4.\u6df1\u5165Linux\u5185\u6838\u67b6\u6784\uff1ahttp:\/\/book.douban.com\/subject\/4843567\/\uff1b<\/strong><\/p>\n<p><strong>5.Linux\u5185\u6838\u63a2\u79d8\uff1ahttp:\/\/book.douban.com\/subject\/25817503\/\uff1b<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>1.\u57fa\u672c\u8bf4\u660e open()\u5728\u5185\u6838\u7684\u5b9e\u73b0\u8fc7\u7a0b\u4e2d\uff0c\u6709\u4e00\u5927\u90e8\u5206\u5de5\u4f5c\u90fd\u662f\u8def\u5f84\u67e5\u627e\u3002\u8def\u5f84\u67e5\u627e\u5373\u5bf9\u7528\u6237\u6001\u4f20\u5165\u7684\u6587\u4ef6\u8def\u5f84\u4ee5\u76ee [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[110,175],"tags":[396,395,393],"class_list":["post-4468","post","type-post","status-publish","format-standard","hentry","category-linux","category-175","tag-open","tag-395","tag-393"],"views":8037,"_links":{"self":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/4468","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/comments?post=4468"}],"version-history":[{"count":12,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/4468\/revisions"}],"predecessor-version":[{"id":4547,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/4468\/revisions\/4547"}],"wp:attachment":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/media?parent=4468"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/categories?post=4468"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/tags?post=4468"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}