{"id":63238,"date":"2025-04-29T11:09:12","date_gmt":"2025-04-29T03:09:12","guid":{"rendered":"https:\/\/fwq.ai\/blog\/63238\/"},"modified":"2025-04-29T11:09:12","modified_gmt":"2025-04-29T03:09:12","slug":"%e5%88%86%e6%9e%90linux-ext2%e6%96%87%e4%bb%b6%e7%b3%bb%e7%bb%9f%e7%9a%84%e7%89%a9%e7%90%86%e7%bb%84%e7%bb%87%e6%96%b9%e5%bc%8f-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/63238\/","title":{"rendered":"\u5206\u6790Linux ext2\u6587\u4ef6\u7cfb\u7edf\u7684\u7269\u7406\u7ec4\u7ec7\u65b9\u5f0f"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/000\/000\/164\/171046584567287.jpg\" class=\"aligncenter\" title=\"\u5206\u6790Linux ext2\u6587\u4ef6\u7cfb\u7edf\u7684\u7269\u7406\u7ec4\u7ec7\u65b9\u5f0f\u63d2\u56fe\" alt=\"\u5206\u6790Linux ext2\u6587\u4ef6\u7cfb\u7edf\u7684\u7269\u7406\u7ec4\u7ec7\u65b9\u5f0f\u63d2\u56fe\" \/><\/p>\n<p>Linux ext2\u6587\u4ef6\u7cfb\u7edf\u662fLinux\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u5e38\u7528\u7684\u6587\u4ef6\u7cfb\u7edf\u4e4b\u4e00\uff0c\u5177\u6709\u8f83\u597d\u7684\u6027\u80fd\u548c\u7a33\u5b9a\u6027\u3002\u672c\u6587\u5c06\u4f1a\u8be6\u7ec6\u5206\u6790 ext2 \u6587\u4ef6\u7cfb\u7edf\u7684\u7269\u7406\u7ec4\u7ec7\u65b9\u5f0f\uff0c\u5e76\u63d0\u4f9b\u4e00\u4e9b\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u6765\u5e2e\u52a9\u8bfb\u8005\u66f4\u597d\u5730\u7406\u89e3\u3002<\/p>\n<p>\u4e00\u3001 ext2 \u6587\u4ef6\u7cfb\u7edf\u6982\u8ff0<\/p>\n<p>ext2 \u6587\u4ef6\u7cfb\u7edf\u662f Linux \u7cfb\u7edf\u4e0a\u6700\u65e9\u671f\u7684\u7b2c\u4e8c\u4ee3\u6269\u5c55\u6587\u4ef6\u7cfb\u7edf\uff0c\u5b83\u5728\u6587\u4ef6\u7cfb\u7edf\u7684\u6027\u80fd\u3001\u53ef\u9760\u6027\u548c\u7a33\u5b9a\u6027\u4e0a\u505a\u4e86\u4e00\u5b9a\u7684\u6539\u8fdb\u3002\u5b83\u4e3b\u8981\u7531\u8d85\u7ea7\u5757\u3001\u7ec4\u63cf\u8ff0\u7b26\u3001\u7d22\u5f15\u8282\u70b9\u8868\uff08inode table\uff09\u3001\u6570\u636e\u5757\u7ec4\u6210\u3002\u5728 ext2 \u6587\u4ef6\u7cfb\u7edf\u4e2d\uff0c\u6570\u636e\u548c\u5143\u6570\u636e\u90fd\u662f\u4ee5\u5757\uff08block\uff09\u7684\u5f62\u5f0f\u5b58\u50a8\uff0c\u6587\u4ef6\u7cfb\u7edf\u7684\u6700\u5c0f\u5b58\u50a8\u5355\u4f4d\u662f\u5757\u800c\u4e0d\u662f\u5b57\u8282\u3002<\/p>\n<p>\u4e8c\u3001 \u7269\u7406\u7ec4\u7ec7\u65b9\u5f0f<\/p>\n<ol>\n<li>\u8d85\u7ea7\u5757\uff08Super Block\uff09\uff1a\u8d85\u7ea7\u5757\u662f ext2 \u6587\u4ef6\u7cfb\u7edf\u4e2d\u7684\u4e00\u4e2a\u5173\u952e\u7ed3\u6784\uff0c\u4fdd\u5b58\u4e86\u6574\u4e2a\u6587\u4ef6\u7cfb\u7edf\u7684\u91cd\u8981\u4fe1\u606f\uff0c\u6bd4\u5982\u5757\u7684\u603b\u6570\u3001\u7a7a\u95f2\u5757\u6570\u3001\u7d22\u5f15\u8282\u70b9\u603b\u6570\u7b49\u3002\u5b83\u901a\u5e38\u4f4d\u4e8e\u6587\u4ef6\u7cfb\u7edf\u7684\u7b2c\u4e00\u5757\uff0c\u5e76\u88ab\u6574\u4e2a\u6587\u4ef6\u7cfb\u7edf\u5171\u4eab\u3002<\/li>\n<li>\u7ec4\u63cf\u8ff0\u7b26\uff08Group 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Table\uff09\uff1a\u7d22\u5f15\u8282\u70b9\u8868\u5b58\u50a8\u4e86\u6240\u6709\u6587\u4ef6\u548c\u76ee\u5f55\u7684\u5143\u6570\u636e\u4fe1\u606f\uff0c\u5982\u6587\u4ef6\u5927\u5c0f\u3001\u6743\u9650\u3001\u6700\u540e\u4fee\u6539\u65f6\u95f4\u7b49\u3002\u6bcf\u4e2a\u7d22\u5f15\u8282\u70b9\u5bf9\u5e94\u4e00\u4e2a\u6587\u4ef6\u6216\u76ee\u5f55\uff0c\u5e76\u4e14\u6709\u4e00\u4e2a\u552f\u4e00\u7684\u7d22\u5f15\u53f7\u3002<\/li>\n<li>\u6570\u636e\u5757\uff08Data Block\uff09\uff1a\u6570\u636e\u5757\u662f\u5b58\u50a8\u6587\u4ef6\u6570\u636e\u7684\u5173\u952e\u90e8\u5206\uff0c\u6587\u4ef6\u7cfb\u7edf\u4e2d\u7684\u6240\u6709\u6587\u4ef6\u6570\u636e\u90fd\u5b58\u50a8\u5728\u6570\u636e\u5757\u4e2d\u3002\u6570\u636e\u5757\u53ef\u4ee5\u662f\u903b\u8f91\u5757\uff08\u903b\u8f91\u5757\u5927\u5c0f\u53ef\u914d\u7f6e\uff09\uff0c\u4e5f\u53ef\u4ee5\u662f\u7269\u7406\u5757\uff08\u901a\u5e38\u548c\u78c1\u76d8\u6247\u533a\u5927\u5c0f\u76f8\u540c\uff09\u3002<\/li>\n<\/ol>\n<p>\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n<pre>#include &lt;stdio.h&gt;\n#include &lt;fcntl.h&gt;\n#include &lt;ext2fs&gt;\n\nint main() {\n    int fd = open(\"\/dev\/sda1\", O_RDONLY);\n    struct ext2_super_block super_block;\n\n    lseek(fd, 1024, SEEK_SET);\n    read(fd, &amp;amp;super_block, sizeof(super_block));\n\n    printf(\"Total blocks: %lu\n\", super_block.s_blocks_count);\n    printf(\"Free blocks: %lu\n\", super_block.s_free_blocks_count);\n\n    close(fd);\n    return 0;\n}&lt;\/ext2fs&gt;&lt;\/fcntl.h&gt;&lt;\/stdio.h&gt;<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u4ee5\u4e0a\u793a\u4f8b\u4ee3\u7801\u6f14\u793a\u4e86\u5982\u4f55\u5728 C \u8bed\u8a00\u4e2d\u8bfb\u53d6 ext2 \u6587\u4ef6\u7cfb\u7edf\u7684\u8d85\u7ea7\u5757\u4fe1\u606f\uff0c\u5176\u4e2d&#8221;\/dev\/sda1&#8243;\u662f\u6587\u4ef6\u7cfb\u7edf\u6240\u5728\u7684\u8bbe\u5907\u6587\u4ef6\u3002\u8bfb\u53d6\u8d85\u7ea7\u5757\u4fe1\u606f\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u4e86\u89e3\u6574\u4e2a\u6587\u4ef6\u7cfb\u7edf\u7684\u5bb9\u91cf\u548c\u5269\u4f59\u7a7a\u95f4\u7b49\u91cd\u8981\u4fe1\u606f\u3002<\/p>\n<p>\u7efc\u4e0a\u6240\u8ff0\uff0cLinux ext2 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Block\uff09\uff1a\u6570\u636e\u5757\u662f\u5b58\u50a8\u6587\u4ef6\u6570\u636e\u7684\u5173\u952e\u90e8\u5206\uff0c\u6587\u4ef6\u7cfb\u7edf\u4e2d\u7684\u6240\u6709\u6587\u4ef6\u6570\u636e\u90fd\u5b58\u50a8\u5728\u6570\u636e\u5757\u4e2d\u3002\u6570\u636e\u5757\u53ef\u4ee5\u662f\u903b\u8f91\u5757\uff08\u903b\u8f91\u5757\u5927\u5c0f\u53ef\u914d\u7f6e\uff09\uff0c\u4e5f\u53ef\u4ee5\u662f\u7269\u7406\u5757\uff08\u901a\u5e38\u548c\u78c1\u76d8\u6247\u533a\u5927\u5c0f\u76f8\u540c\uff09\u3002 \u793a\u4f8b\u4ee3\u7801\uff1a #include &lt;stdio.h&gt; #include &lt;fcntl.h&gt; #include &lt;ext2fs&gt; int main() { int fd = open(&#8220;\/dev\/sda1&#8221;, O_RDONLY); struct ext2_super_block super_block; lseek(fd, 1024, SEEK_SET); read(fd, &amp;amp;super_block, sizeof(super_block)); printf(&#8220;Total blocks: %lu &#8220;, super_block.s_blocks_count); [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-63238","post","type-post","status-publish","format-standard","hentry","category-os"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/63238","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=63238"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/63238\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=63238"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=63238"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=63238"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}