{"id":204,"date":"2012-12-03T17:00:33","date_gmt":"2012-12-03T09:00:33","guid":{"rendered":"http:\/\/heliang.net.cn\/?p=204"},"modified":"2012-12-03T17:00:33","modified_gmt":"2012-12-03T09:00:33","slug":"%e7%a3%81%e7%9b%98%e6%a6%82%e5%bf%b5track-cylinder-sector-block%e7%ad%89","status":"publish","type":"post","link":"https:\/\/www.heliang.net.cn\/?p=204","title":{"rendered":"\u78c1\u76d8\u6982\u5ff5:track cylinder sector block\u7b49"},"content":{"rendered":"<p>side\/ head<\/p>\n<ul>\n<li>\u786c\u76d8\u4e00\u822c\u662f\u7531\u4e00\u7247\u6216\u51e0\u7247\u5706\u5f62\u8584\u819c\u53e0\u52a0\u800c\u6210\u3002\u6bcf\u4e2a\u5706\u5f62\u8584\u819c\u90fd\u6709\u4e24\u4e2a&#8221;\u9762&#8221;(Side)\uff0c\u8fd9\u4e24\u4e2a\u9762\u90fd\u662f\u7528\u6765\u5b58\u50a8\u6570\u636e\u7684\u3002\u4f9d\u6b21\u79f0\u4e3a0\u9762\u30011\u9762\u30012\u9762\u2026\u2026\u7531\u4e8e\u6bcf\u4e2a\u9762\u90fd\u4e13\u6709\u4e00\u4e2a\u8bfb\u5199\u78c1\u5934\uff0c\u4e5f\u5e38\u75280\u5934(head)\u30011\u5934\u2026\u2026\u79f0\u4e4b\u3002<\/li>\n<li>\u786c\u76d8\u9762\u6570\uff08\u6216\u5934\u6570\uff09\uff0c\u5c11\u7684\u53ea\u67092\u9762\uff0c\u591a\u7684\u53ef\u8fbe\u6570\u5341\u9762\u3002<\/li>\n<\/ul>\n<p><wbr><wbr><wbr>track&#8212;&#8212;\u78c1\u9053\u2014\u2014\u4e00\u4e2a\u5708<br \/>\n<wbr><wbr><wbr>\u8bfb\u5199\u786c\u76d8\u65f6\uff0c\u78c1\u5934\u4e0d\u52a8\uff0c\u78c1\u76d8\u662f\u65cb\u8f6c\u7684\uff0c\u5219\u8fde\u7eed\u5199\u5165\u7684\u6570\u636e\u662f\u6392\u5217\u5728\u4e00\u4e2a\u5706\u5468\u4e0a\u7684\u3002<br \/>\n\u6211\u4eec\u79f0\u8fd9\u6837\u7684\u5706\u5468\u4e3a\u4e00\u4e2a\u78c1\u9053\uff08Track\uff09\u3002<\/p>\n<ul>\n<li><wbr><wbr><wbr>\u78c1\u5934\u4e0d\u52a8\uff0c\u5c31\u662f\u5728\u4e00\u4e2a\u78c1\u9053\u4e0a\u8bfb\u5199\n<li><wbr><wbr><wbr>\u78c1\u5934\u79fb\u52a8\uff0c\u5c31\u4f1a\u5728\u4e0d\u540c\u78c1\u9053\u4e0a\u8bfb\u5199<\/wbr><\/wbr><\/wbr><\/li>\n<p><\/wbr><\/wbr><\/wbr><\/li>\n<\/ul>\n<p><wbr><wbr><wbr>\u6839\u636e\u786c\u76d8\u89c4\u683c\u7684\u4e0d\u540c\uff0c\u78c1\u9053\u6570\u53ef\u4ee5\u4ece\u51e0\u767e\u5230\u6570\u5343\u4e0d\u7b49<br \/>\n<wbr><wbr><wbr>\u4e00\u4e2a\u78c1\u9053\u4e0a\u53ef\u4ee5\u5bb9\u7eb3\u6570KB\u7684\u6570\u636e\uff08\u4e00\u4e2atrack\u5305\u542b\u6570\u4e2asector\uff09<\/p>\n<p><wbr><wbr>cylinder&#8212;-\u67f1\u9762&#8212;&#8212;&#8212;\u5916\u89c2\u8c61\u8c61\u4e00\u4e2a\u5706\u7b52\u5b50<br \/>\n<wbr><wbr><wbr>\u5404\u9762\u4e0a\u78c1\u9053\u53f7\u76f8\u540c\u7684\u78c1\u9053\u5408\u8d77\u6765\uff0c\u79f0\u4e3a\u4e00\u4e2a\u67f1\u9762\uff08cylinder\uff09<br \/>\n\u8ddd\u8f74\u7684\u8ddd\u79bb\u76f8\u540c\u7684\u4e00\u7ec4track<br \/>\n<a href=\"http:\/\/photo.blog.sina.com.cn\/showpic.html#blogid=6151984a0100fojk&amp;url=http:\/\/static5.photo.sina.com.cn\/orignal\/6151984at76467861f7b4&amp;690\" target=\"_blank\"><img title=\"\u78c1\u76d8\u6982\u5ff5\" src=\"http:\/\/simg.sinajs.cn\/blog7style\/images\/common\/sg_trans.gif\" alt=\"\u78c1\u76d8\u6982\u5ff5\" \/><\/a><br \/>\n<wbr><\/p>\n<p><wbr><wbr>cylinder\u4e5f\u662f\u78c1\u76d8\u5206\u533a\u65f6\u7684\u6700\u5c0f\u5355\u4f4d,\u5206\u533a\u662f\u6309\u78c1\u9053\u548c\u67f1\u9762\u8fde\u7eed\u5206\u5e03\u7684(\u5373\u6bcf\u4e2a\u5206\u533a\uff0c\u90fd\u662f\u7c97\u7ec6\u4e0d\u540c\u7684\u7b52\u5b50)<\/p>\n<table border=\"1\" cellspacing=\"1\" cellpadding=\"3\">\n<tbody>\n<tr>\n<td>Command (m for help): n<br \/>\nCommand action<br \/>\n<wbr><wbr>e <wbr><wbr>extended<br \/>\n<wbr><wbr>p <wbr><wbr>primary partition (1-4)<br \/>\np<br \/>\nPartition number (1-4): 1<br \/>\nFirst cylinder (1-524, default 1): <wbr><wbr><br \/>\n<\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><wbr><wbr>Sector<br \/>\n<wbr><wbr><wbr>\u4e00\u4e2atrack\u4e0a\u53ef\u4ee5\u5bb9\u7eb3\u6570KB\u7684\u6570\u636e\uff0c\u800c\u4e3b\u673a\u8bfb\u5199\u65f6\u5f80\u5f80\u5e76\u4e0d\u9700\u8981\u4e00\u6b21\u8bfb\u5199\u90a3\u4e48\u591a\uff0c\u4e8e\u662f\uff0c\u78c1\u9053\u53c8\u88ab\u6309512\u5b57\u8282\u5212\u5206\u6210\u82e5\u5e72\u6bb5\uff0c\u6bcf\u6bb5\u79f0\u4e3a\u4e00\u4e2a\u6247\u533a\uff08Sector\uff09\u3002<br \/>\n<wbr><wbr><wbr>\u4e00\u4e2a\u6247\u533asize\u662f\u56fa\u5b9a\u7684512\u5b57\u8282<\/p>\n<p><wbr><wbr><wbr>\u8ba1\u7b97\u673a\u5bf9\u786c\u76d8\u7684\u8bfb\u5199\uff0c\u662f\u4ee5\u6247\u533a\u4e3a\u6700\u5c0f\u5355\u4f4d<br \/>\n\u5373\u4f7f\u53ea\u8bfb\u67d0\u4e00\u4e2a\u5b57\u8282\uff0c\u4e5f\u5fc5\u987b\u4e00\u6b21\u628a\u8fd9\u4e2a\u5b57\u8282\u6240\u5728\u7684\u6247\u533a\u4e2d\u7684512\u5b57\u8282\u5168\u90e8\u8bfb\u5165\u5185\u5b58<\/p>\n<p><wbr><wbr><wbr>\u4ea4\u53c9\u56e0\u5b50<\/p>\n<ul>\n<li><wbr>\u6247\u533a\u53f7\u5e76\u4e0d\u662f\u8fde\u7eed\u7d27\u6328\u7740\u7684\uff0c\u800c\u662f\u6309\u7167\u67d0\u4e2a\u95f4\u9694\u8df3\u8dc3\u7740\u7f16\u6392\u7684\u3002\u8fd9\u4e2a\u95f4\u9694\u5c31\u662f\u4ea4\u53c9\u56e0\u5b50\u3002<\/wbr><\/li>\n<\/ul>\n<p>\u4e3e\u4e2a\u4f8b\u5b50\uff1a\u5728\u67d0\u4e2a\u786c\u76d8\u4e0a\uff0c\u4ee5\u5b9e\u9645\u5b58\u50a8\u4f4d\u7f6e\u800c\u8bba\uff0c2\u53f7\u6247\u533a\u5e76\u4e0d\u662f1\u53f7\u6247\u533a\u540e\u7684\u7b2c\u4e00\u4e2a\uff0c\u800c\u662f\u7b2c5\u4e2a\uff0c3\u53f7\u6247\u533a\u53c8\u662f2\u53f7\u6247\u533a\u540e\u7684\u7b2c5\u4e2a\uff0c\u4ee5\u6b64\u7c7b\u63a8\u3002<br \/>\n\u8fd9\u4e2a&#8221;5&#8243;\u5c31\u662f\u6211\u4eec\u8bf4\u7684\u4ea4\u53c9\u56e0\u5b50\u3002<br \/>\n2\uff0c10\uff0c7\uff0c21\uff0c3\uff0c11\uff0c8\uff0c22\uff0c4<\/p>\n<ul>\n<li>\u9009\u62e9\u9002\u5f53\u7684\u4ea4\u53c9\u56e0\u5b50\uff0c\u53ef\u4f7f\u786c\u76d8\u8bfb\u5199\u901f\u5ea6\u4e0e\u786c\u76d8\u7684\u65cb\u8f6c\u901f\u5ea6\u76f8\u5339\u914d\uff0c\u63d0\u9ad8\u5b58\u50a8\u6570\u636e\u7684\u901f\u5ea6<\/li>\n<\/ul>\n<p><wbr><wbr><wbr>block&#8212;\u6587\u4ef6\u7cfb\u7edf\uff08FS\uff09\u7684\u6700\u5c0f\u5b58\u53d6\u7a7a\u95f4<\/p>\n<ul>\n<li><wbr><wbr><wbr>\u4e00\u4e2a Block \u6700\u591a\u4ec5\u80fd\u5bb9\u7eb3\u4e00\u4e2a\u6587\u4ef6\uff08\u5373\u4e0d\u5b58\u5728\u591a\u4e2a\u6587\u4ef6\u540c\u4e00\u4e2ablock\u7684\u60c5\u51b5\uff09<\/wbr><\/wbr><\/wbr><\/li>\n<\/ul>\n<p>\u5373\u5982\u679c\u4e00\u4e2a\u6587\u4ef6\u6bd4block\u5c0f\uff0c\u4ed6\u4e5f\u4f1a\u5360\u7528\u4e00\u4e2ablock,\u56e0\u800cblock\u4e2d\u7a7a\u4f59\u7684\u7a7a\u95f4\u4f1a\u6d6a\u8d39\u6389<\/p>\n<ul>\n<li><wbr><wbr><wbr>\u4e00\u4e2a\u5927\u6587\u4ef6\uff0c\u53ef\u4ee5\u5360\u591a\u4e2a\u751a\u81f3\u6570\u5341\u4e2a\u6210\u767e\u4e0a\u5343\u7684block<\/wbr><\/wbr><\/wbr><\/li>\n<\/ul>\n<table border=\"1\" cellspacing=\"1\" cellpadding=\"3\">\n<tbody>\n<tr>\n<td># df<br \/>\n\/ <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>(\/dev\/dsk\/c0t3d0s0 ): <wbr>573548 blocks <wbr><wbr>226057 files<br \/>\n\/proc <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>(\/proc <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>): <wbr><wbr><wbr><wbr><wbr><wbr>0 blocks <wbr><wbr><wbr><wbr>3854 files<br \/>\n\/var <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>(\/dev\/dsk\/c0t3d0s1 ): 1897206 blocks <wbr><wbr>250028 files<br \/>\n\/var\/run <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>(swap <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>): <wbr>611424 blocks <wbr><wbr><wbr>26300 files<br \/>\n\/tmp <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>(swap <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>): <wbr>611424 blocks <wbr><wbr><wbr>26300 files<br \/>\n<\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><wbr><wbr><\/p>\n<p><wbr><wbr><wbr>sector \u548cblock\u7684\u5206\u522b<\/p>\n<ul>\n<li><wbr><wbr>sector \u662f\u786c\u76d8\u5b58\u53d6\u7684\u6700\u5c0f\u5355\u4f4d\uff0c\u662f512Bytes\n<li><wbr><wbr>block\u662ffs \u5b58\u53d6\u7684\u6700\u5c0f\u5355\u4f4d\u5f88\u5355\u4e2a\u6587\u4ef6\u7684\u6700\u5c0f\u5355\u4f4d\uff0c\u53ef\u4ee5\u968f\u610f\u8bbe\u5b9a\uff0c fs\u6709\u81ea\u5df1\u7f3a\u7701\u7684block\u5927\u5c0f\u3002<\/wbr><\/wbr><\/li>\n<p><\/wbr><\/wbr><\/li>\n<\/ul>\n<p><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>\u5982ext2 fs\u7684block\u7f3a\u7701\u662f4k\uff08\u53738 sector\uff09<\/p>\n<p><wbr><wbr><wbr>block\u5927\u5c0f\u662f\u56fa\u5b9a\u7684\uff0c\u4f46\u53ef\u4ee5\u8bbe\u7f6e<br \/>\n\u7f3a\u7701\u662f4096, \u6700\u5927\u8bbe\u7f6e\u52308192\uff08\u4e00\u822c\u9488\u5bf9\u5927\u6587\u4ef6\u7cfb\u7edf\uff09<br \/>\n\u6240\u4ee5\u5e94\u8be5\u6839\u636e\u81ea\u5df1\u7cfb\u7edf\u5e94\u7528\u7684\u7279\u70b9\uff0c\u5408\u7406\u89c4\u5212block size<\/p>\n<ul>\n<li><wbr><wbr><wbr>\u82e5block\u592a\u5927\uff0c\u5219\u5b58\u53d6\u5c0f\u6587\u4ef6\u65f6\uff0c\u6709\u7a7a\u95f4\u6d6a\u8d39\u7684\u95ee\u9898\n<li><wbr><wbr><wbr>\u82e5block\u592a\u5c0f\uff0c\u5219\u786c\u76d8\u7684 Block \u6570\u76ee\u4f1a\u5927\u589e\uff0c\u800c\u9020\u6210 inode \u5728\u6307\u5411 block \u65f6\u5019\u7684\u4e00\u4e9b\u641c\u5bfb\u65f6\u95f4\u7684\u589e\u52a0\uff0c\u53c8\u4f1a\u9020\u6210\u5927\u6587\u4ef6\u8bfb\u5199\u65b9\u9762\u7684\u6548\u7387\u8f83\u5dee<\/wbr><\/wbr><\/wbr><\/li>\n<p><\/wbr><\/wbr><\/wbr><\/li>\n<\/ul>\n<p><wbr><wbr><wbr>\u4ee5sun\u7684ultra\u4e3a\u4f8b\uff1a\u4e0d\u540c\u78c1\u5206\u533a\u76d8\uff08slice\uff09\u6216mount point\uff0c block size\u4e0d\u540c\uff0c\u4e00\u822c\u662f8192,\u663e\u7136\u662f\u5bf9\u5927\u6587\u4ef6\u5b58\u53d6\u7684<\/p>\n<table border=\"1\" cellspacing=\"1\" cellpadding=\"3\">\n<tbody>\n<tr>\n<td># df -g<br \/>\n\/ <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>(\/dev\/dsk\/c0t3d0s0 ): <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>8192 block size <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>1024 frag size <wbr><br \/>\n<wbr>2031084 total blocks <wbr><wbr><wbr><wbr>573548 free blocks <wbr><wbr>451684 available <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>253760 total files<br \/>\n<wbr>226057 free files <wbr><wbr><wbr><wbr>35651584 filesys id <wbr><br \/>\n<wbr><wbr><wbr><wbr>ufs fstype <wbr><wbr><wbr><wbr><wbr><wbr>0x00000004 flag <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>255 filename length<\/p>\n<p>\/proc <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>(\/proc <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>): <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>512 block size <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>512 frag size <wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>0 total blocks <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>0 free blocks <wbr><wbr><wbr><wbr><wbr><wbr><wbr>0 available <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>3900 total files<br \/>\n<wbr><wbr><wbr>3854 free files <wbr><wbr><wbr><wbr>66584576 filesys id <wbr>\/proc<br \/>\n<wbr><wbr><wbr>proc fstype <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>00000000 flag <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>64 filename length<\/p>\n<p>\/etc\/mnttab <wbr><wbr><wbr><wbr><wbr><wbr><wbr>(mnttab <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>): <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>512 block size <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>512 frag size <wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>0 total blocks <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>0 free blocks <wbr><wbr><wbr><wbr><wbr><wbr><wbr>0 available <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>1 total files<br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>0 free files <wbr><wbr><wbr><wbr>68419584 filesys id <wbr>\/mnttab<br \/>\n<wbr><wbr>mntfs fstype <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>00000000 flag <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>64 filename length<br \/>\n<\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><wbr><wbr>Superblock&#8212;&#8212;&#8212;\u6587\u4ef6\u7cfb\u7edfFS\u7684\u7b2c\u4e00\u4e2ablcok<\/p>\n<ul>\n<li><wbr><wbr><wbr>superblock\u5373\u6bcf\u4e2a\u5206\u533a\u4e0a\u6240\u5efa\u7acb\u7684fs\u7684\u7b2c\u4e00\u4e2a block\uff0c\u5c31\u79f0\u505asuperblock\n<li><wbr><wbr><wbr>super block \u662f\u4ece\u5206\u533a\u5934\u7684\u7b2c1024byte\u4ee5\u540e\u5f00\u59cb\u7684\n<li><wbr><wbr>super block\u4e5f\u4e00\u5171\u6709 1024 bytes \u90a3\u4e48\u5927\n<li><wbr><wbr><wbr>superblock \u4e0a\u7684\u5185\u5bb9\uff0c\u4e3b\u8981\u662f\u63cf\u8ff0\u6587\u4ef6\u7cfb\u7edfFS\u7684\u5927\u5c0f\u3001\u7a7a\u7684\u548c\u586b\u6ee1\u7684block(s_blocks_count,s_r_blocks_count,s_free_blocks_count)\uff0c\u4ee5\u53ca\u4ed6\u5404\u81ea\u7684\u603b\u6570\u548c\u5176\u4ed6\u7edf\u8ba1\u503c<\/wbr><\/wbr><\/wbr><\/li>\n<p><\/wbr><\/wbr><\/li>\n<p><\/wbr><\/wbr><\/wbr><\/li>\n<p><\/wbr><\/wbr><\/wbr><\/li>\n<\/ul>\n<p><wbr><\/p>\n<p><wbr><wbr><wbr>ext3 \u7684super block<\/p>\n<table border=\"1\" cellspacing=\"1\" cellpadding=\"3\">\n<tbody>\n<tr>\n<td>struct ext3_super_block {<br \/>\n__u32 s_inodes_count; <wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u32 s_blocks_count; <wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u32 s_r_blocks_count; <wbr><wbr><wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u32 s_free_blocks_count;<br \/>\n__u32 s_free_inodes_count;<br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u32 s_first_data_block; <wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u32 s_log_block_size; <wbr><wbr><wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__s32 s_log_frag_size; <wbr><wbr><wbr><wbr><\/p>\n<p>__u32 s_blocks_per_group; <wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>block size\u548cblock group size\u90fd\u662f\u56fa\u5b9a\u7684\uff0c\u90fd\u53ef\u5b9a\u4e49<br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u32 s_frags_per_group; <wbr><wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u32 s_inodes_per_group; <wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u32 s_mtime; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n__u32 s_wtime; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u16 s_mnt_count; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__s16 s_max_mnt_count; <wbr><wbr><wbr><wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u16 s_magic; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>magic \u7b7e\u540d\uff0c\u5bf9\u4e8e ext2 \u548c ext3 \u6587\u4ef6\u7cfb\u7edf\u6765\u8bf4\uff0c\u8fd9\u4e2a\u5b57\u6bb5<br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>\u7684\u503c\u5e94\u8be5\u6b63\u597d\u90fd\u7b49\u4e8e 0xEF53<br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>\u663e\u7136\uff0cext2 \u548c ext3 \u7684\u517c\u5bb9\u6027\u4e00\u5b9a\u662f\u5f88\u5f3a\u7684<br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u16 s_state; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u16 s_errors; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u16 s_minor_rev_level; <wbr><wbr><br \/>\n__u32 s_lastcheck; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u32 s_checkinterval; <wbr><wbr><wbr><wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u32 s_creator_os; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u32 s_rev_level; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n__u16 s_def_resuid; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u16 s_def_resgid; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u32 s_first_ino; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u16 s_inode_size; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u16 s_block_group_nr; <wbr><wbr><wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u32 s_feature_compat; <wbr><wbr><wbr><br \/>\n__u32 s_feature_incompat; <wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u32 s_feature_ro_compat;<br \/>\n__u8 <wbr>s_uuid[16]; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\nchar <wbr>s_volume_name[16]; <wbr><wbr><br \/>\nchar <wbr>s_last_mounted[64]; <wbr><br \/>\n__u32 s_algorithm_usage_bitmap;<br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u8 <wbr>s_prealloc_blocks; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u8 <wbr>s_prealloc_dir_blocks; <wbr><wbr><wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u16 s_padding1; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n__u8 <wbr>s_journal_uuid[16];<br \/>\n__u32 s_journal_inum; <wbr><wbr><wbr><wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u32 s_journal_dev; <wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr>__u32 s_last_orphan; <wbr><wbr><wbr><wbr><wbr><br \/>\n__u32 s_reserved[197]; <wbr><wbr><wbr><br \/>\n};<br \/>\n<\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><wbr><wbr><wbr>block group<br \/>\nblocks \u88ab\u805a\u5728\u4e00\u8d77\u5206\u6210\u51e0\u4e2a\u5927\u7684 block group\u3002<\/p>\n<p><wbr><wbr><wbr>block group descriptor<br \/>\n<wbr><wbr><wbr>block group descriptor\u53ea\u5360\u4e00\u4e2ablock<br \/>\n<wbr><wbr><wbr>\u786c\u76d8\u5206\u533a\u7684\u5f00\u5934\u90e8\u5206\uff0c\u5728 super block \u7684\u540e\u9762\uff0c\u7b2c\u4e8c\u4e2ablock\u5c31\u662fgroup descriptor table<br \/>\n<wbr><wbr><wbr>block group descriptor\u5185\u4e00\u6761block group\u8bb0\u5f5532bytes\u5927\uff0c\u5b83\u4ee3\u8868\u4e00\u4e2ablock group\uff08\u6ce8\u610f\u4e0d\u662fblock,\u800c\u662fblock group,\u4e00 \u6761block group decriptor\u5185\u768432\u5b57\u8282\u8bb0\u5f55\uff0c\u63cf\u8ff0\u4e00\u4e2ablock group\uff09<\/p>\n<p><wbr><wbr><wbr>block group descriptor\u4e2d\u7684block group\u8bb0\u5f55\u7684\u4e09\u4e2a block \u6307\u9488<\/p>\n<table border=\"1\" cellspacing=\"1\" cellpadding=\"3\">\n<tbody>\n<tr>\n<td>struct ext3_group_desc<br \/>\n{<br \/>\n<wbr>__u32 bg_block_bitmap; <wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr>__u32 bg_inode_bitmap; <wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr>__u32 bg_inode_table; <wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr>__u16 bg_free_blocks_count;<br \/>\n<wbr>__u16 bg_free_inodes_count;<br \/>\n<wbr>__u16 bg_used_dirs_count; <wbr><wbr><br \/>\n<wbr>__u16 bg_pad; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr>__u32 bg_reserved[3]; <wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n};<br \/>\n<\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/td>\n<\/tr>\n<tr>\n<td><wbr><wbr><wbr>block bitmap\u6307\u9488<br \/>\n<wbr><wbr><wbr>\u6307\u5411\u8be5block group \u7684block bitmap<br \/>\n<wbr><wbr><wbr>\uff08<br \/>\n<wbr><wbr><wbr>block bitmap\u4ecb\u7ecd\uff1a<br \/>\n<wbr><wbr><wbr>block bitmap \u4e2d\u7684\u6bcf\u4e2a bit \u8868\u793a\u4e00\u4e2a block\uff0c\u5982\u679c\u8be5 bit \u4e3a 0\uff0c\u8868\u793a\u8be5 block \u4e2d\u6709\u6570\u636e\uff0c\u5982\u679c bit \u4e3a 1\uff0c\u5219\u8868\u793a\u8be5 block \u662f\u7a7a\u95f2\u7684\u3002<br \/>\n<wbr><wbr><wbr>\u8fd9\u4e2a block bitmap \u672c\u8eab\u4e5f\u6b63\u597d\u53ea\u6709\u4e00\u4e2a block \u90a3\u4e48\u5927\u5c0f<br \/>\n<wbr><wbr>\uff09<br \/>\n<\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/td>\n<\/tr>\n<tr>\n<td><wbr><wbr><wbr>inode bitmap\u6307\u9488<br \/>\n<wbr><wbr><wbr>\u6307\u5411\u8be5block group \u7684 inode bitmap<br \/>\n<wbr><wbr><wbr>\uff08<br \/>\n<wbr><wbr><wbr>inode bitmap\u4ecb\u7ecd\uff1a<br \/>\n<wbr><wbr><wbr>inode bitmap\u91cc\u9762\u7684\u6bcf\u4e00\u4e2a bit \u76f8\u5bf9\u5e94\u4e00\u4e2a inode<br \/>\n<wbr><wbr><wbr>\u8fd9\u4e2a inode bitmap \u540c\u6837\u4e5f\u662f\u6b63\u597d\u6709\u4e00\u4e2a block \u90a3\u4e48\u5927<br \/>\n<wbr><wbr><wbr><wbr>\uff09<br \/>\n<\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/td>\n<\/tr>\n<tr>\n<td>\n<wbr><wbr><wbr>inode table\u6307\u9488<br \/>\n<wbr><wbr><wbr>\u6307\u5411\u8be5block group \u7684inode table\u3002<br \/>\n<wbr><wbr><wbr>\uff08<br \/>\n<wbr><wbr><wbr><wbr>inode table\u4ecb\u7ecd\uff1a<br \/>\n<wbr><wbr><wbr><wbr>inode table \u4e0d\u6b62\u4e00\u4e2a block \u90a3\u4e48\u5927\u4e86\u3002<br \/>\n<wbr><wbr><wbr><wbr>inode table \u662f block group \u4e2d\u6240\u805a\u96c6\u5230\u7684\u5168\u90e8 inode \u653e\u5728\u4e00\u8d77\u5f62\u6210\u7684\u3002<br \/>\n<wbr><wbr><wbr>{<br \/>\n<\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><wbr><wbr>\u4ec0\u4e48\u662finode\uff1f<\/p>\n<ul>\n<li><wbr><wbr><wbr>inode\u5c31\u6307 block group <wbr>\u4e2dinode table\u4e2d\u7684\u6761\u76ee.<\/wbr><\/wbr><\/wbr><\/wbr><\/li>\n<\/ul>\n<p><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>\u5b83\u4e0d\u8c61block\u90a3\u6837\u5e76\u4e0d\u771f\u5b9e\u5b58\u5728,inode\u53ea\u662f\u5728inode tables \u7684\u4e00\u4e2a\u6761\u76ee<\/p>\n<ul>\n<li><wbr><wbr><wbr>inode \u6761\u76ee\u63cf\u8ff0\u4e00\u4e2a\u6587\u4ef6,\u5bf9\u5e94\u7740\u6587\u4ef6\u7cfb\u7edf\u4e0a\u7684\u4e00\u4e2a\u6587\u4ef6\u6216\u8005\u76ee\u5f55\uff0c\u6307\u51fa\u4e86\u4ef6\u7684\u540d\u79f0\u3001\u5927\u5c0f\u3001\u8fde\u63a5\u6570\u91cf\uff0cblock\u6307\u9488\u7b49\n<li><wbr><wbr><wbr>inode \u6761\u76ee\u901a\u8fc7\u4e00\u7cfb\u5217\u7684 block \u6307\u9488\uff0c\u6307\u5411block group\u5185\u7684\u5177\u4f53\u7684 block\uff0c\u91cc\u9762\u5c31\u5b58\u653e\u4e86\u6587\u4ef6\u7684\u5177\u4f53\u6570\u636e\n<li><wbr><wbr><wbr>\u8bfb\u53d6\u6587\u4ef6\u7684\u5185\u5bb9\uff0c\u53ea\u8981\u628a\u76f8\u5e94\u7684 inode \u6307\u5411\u7684block\u7684\u5185\u5bb9\u5168\u90e8\u8bfb\u51fa\u6765\u5c31\u884c\u4e86<\/wbr><\/wbr><\/wbr><\/li>\n<p><\/wbr><\/wbr><\/wbr><\/li>\n<p><\/wbr><\/wbr><\/wbr><\/li>\n<\/ul>\n<p><wbr><wbr><wbr>inode table<br \/>\n<wbr><wbr><wbr>inode table \u4f4d\u4e8e\u4e00\u4e2ablock group \u7684\u7b2c\u4e8cblock\u4e4b\u540e\uff0c\u63cf\u8ff0\u8fd9\u4e2ablock group\u5185\u7684\u6240\u6709inode<br \/>\n<wbr><wbr><wbr>inode table \u5185\u7684\u4e00\u4e2a\u6761\u76ee\u5c31\u662f\u4e00\u4e2a inode\uff0c\u5c31\u4ee3\u8868\u4e00\u4e2a\u6587\u4ef6<\/p>\n<p><wbr><wbr><wbr>\u4e00\u4e2ainode \u4ee3\u8868\u4e00\u4e2a\u6587\u4ef6\uff0c\u4f46inode struct\u91cc\u4e0d\u5305\u62ec\u6587\u4ef6\u540d\uff0c\u6587\u4ef6\u540d\u5728\u54ea\u91cc\uff1f<\/p>\n<table border=\"1\" cellspacing=\"1\" cellpadding=\"3\">\n<tbody>\n<tr>\n<td>struct ext3_inode {<br \/>\n<wbr>__u16 i_mode; <wbr><wbr><wbr><br \/>\n<wbr>__u16 i_uid; <wbr><wbr><wbr><wbr><br \/>\n<wbr>__u32 i_size; <wbr><wbr><wbr><br \/>\n<wbr>__u32 i_atime; <wbr><wbr><br \/>\n<wbr>__u32 i_ctime; <wbr><wbr><br \/>\n<wbr>__u32 i_mtime; <wbr><wbr><br \/>\n<wbr>__u32 i_dtime; <wbr><wbr><br \/>\n<wbr>__u16 i_gid; <wbr><wbr><wbr><wbr><br \/>\n<wbr>__u16 i_links_count; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr>__u32 i_blocks; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr>__u32 i_flags; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr>__u32 l_i_reserved1; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr>__u32 i_block[EXT3_N_BLOCKS];<br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>inode \u91cc\u9762\u53ef\u4ee5\u5b58\u653e EXT3_N_BLOCKS\uff08= 15\uff09\u8fd9\u4e48\u591a\u4e2a block \u6307\u9488\u3002\u7528\u6237\u6570\u636e\u5c31\u4ece\u8fd9\u4e9b block \u91cc\u9762\u83b7\u5f97\u3002<br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>15 \u4e2a blocks \u4e0d\u4e00\u5b9a\u653e\u5f97\u4e0b\u5168\u90e8\u7684\u7528\u6237\u6570\u636e<br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>\u524d 12 \u4e2a\u662f\u6240\u8c13\u7684 direct blocks\uff0c\u91cc\u9762\u76f4\u63a5\u5b58\u653e\u7684\u5c31\u662f\u7528\u6237\u6570\u636e\u3002<br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>\u7b2c 13 \u4e2a block \u662f indirect block\uff0c\u91cc\u9762\u5b58\u653e\u7684\u5168\u662f block \u6307\u9488\uff0c\u8fd9\u4e9b block \u6307\u9488\u6307\u5411\u7684 block \u5b58\u653e\u7528\u6237\u540e\u9762\u7684\u6570\u636e<br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>\u7b2c 14 \u4e2a block \u662f double indirect block\uff0c\u91cc\u9762\u5b58\u653e\u7684\u5168\u662f block \u6307\u9488\uff0c\u8fd9\u4e9b block \u6307\u9488\u6307\u5411\u7684 block\u88ab\u7528\u6765\u5b58\u653e\u7528\u6237\u6570\u636e<br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>\u7b2c 15 \u4e2a block \u662f triple indirect block\uff0c\u6bd4\u4e0a\u9762\u8bf4\u7684 double indirect block \u6709\u591a\u4e86\u4e00\u5c42 block \u6307\u9488\u3002<br \/>\n<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr>__u32 i_generation; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr>__u32 i_file_acl; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr>__u32 i_dir_acl; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr>__u32 i_faddr; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr>__u8 <wbr>l_i_frag; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr>__u8 <wbr>l_i_fsize; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr>__u16 i_pad1; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr>__u16 l_i_uid_high; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr>__u16 l_i_gid_high; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n<wbr>__u32 l_i_reserved2; <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br \/>\n};<br \/>\n<\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><wbr><wbr><wbr>\u771f\u6b63\u7684\u6587\u4ef6\u540d\u4e0d\u5b58\u5728\u4e8e\u6587\u4ef6inode\u4e2d\uff0c\u800c\u662f\u5728\u76ee\u5f55\u6587\u4ef6inode\u4e2d<\/p>\n<ul>\n<li>\u76ee\u5f55\u672c\u8eab\u4ee5\u6587\u4ef6\u5f62\u5f0f\u5b58\u5728<\/li>\n<li>\u76ee\u5f55\u6587\u4ef6\u4e5f\u662f\u4e00\u4e2a\u8868\uff0c\u8fd9\u4e2a\u6587\u4ef6\u4e2d\u4e5f\u5305\u542b\u5f88\u591a\u6761\u76ee\uff0c\u6bcf\u4e2a\u6761\u76ee\u90fd\u4ee3\u8868\u4e00\u4e2a\u76ee\u5f55\u4e2d\u7684\u6587\u4ef6\uff0c\u6307\u5411\u4e00\u4e2ainode<\/li>\n<\/ul>\n<table border=\"1\" cellspacing=\"1\" cellpadding=\"3\">\n<tbody>\n<tr>\n<td>struct ext3_dir_entry_2 {<br \/>\n<wbr>__u32 inode; <wbr><wbr><wbr><br \/>\n<wbr>__u16 rec_len; <wbr><br \/>\n<wbr>__u8 <wbr>name_len;<br \/>\n<wbr>__u8 <wbr>file_type;<br \/>\n<wbr>char <wbr>name[EXT3_NAME_LEN];<br \/>\n};<br \/>\n<\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u8fd9\u4e2a\u76ee\u5f55\u6587\u4ef6\u7684\u6761\u76ee\u6307\u5411inode table\u4e2d\u7684inode\u6761\u76ee<\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/wbr><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>side\/ head 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