{"id":408,"date":"2023-07-26T14:03:44","date_gmt":"2023-07-26T06:03:44","guid":{"rendered":"https:\/\/blog.taiyang.space\/?p=408"},"modified":"2023-07-26T14:03:44","modified_gmt":"2023-07-26T06:03:44","slug":"l11-%e7%9b%ae%e5%bd%95%e4%b8%8e%e6%96%87%e4%bb%b6%e7%b3%bb%e7%bb%9f","status":"publish","type":"post","link":"https:\/\/blog.taiyang.space\/?p=408","title":{"rendered":"L11-\u76ee\u5f55\u4e0e\u6587\u4ef6\u7cfb\u7edf"},"content":{"rendered":"

\u4e0a\u4e00\u7ae0\u4ecb\u7ecd\u4e86\u5982\u4f55\u901a\u8fc7\u6587\u4ef6\u6765\u4f7f\u7528\u78c1\u76d8\uff0c\u4f46\u5728\u771f\u5b9e\u7684\u7cfb\u7edf\u4e2d\uff0c\u7528\u6237\u90fd\u662f\u901a\u8fc7\u201c\u76ee\u5f55\u6811\u201d\u6765\u4f7f\u7528\u78c1\u76d8\u7684\u3002\u672c\u7ae0\u5c06\u4ecb\u7ecd\u5982\u4f55\u5c06\u6574\u4e2a\u78c1\u76d8\u53d8\u6210\u4e00\u9897\u201c\u76ee\u5f55\u6811\u201d\uff0c\u800c\u4e14\u8ba9\u8fd9\u9897\u201c\u76ee\u5f55\u6811\u201d\u5728\u5404\u79cd\u7cfb\u7edf\u4e0a\uff08Linux\u6216Windows\uff09\u90fd\u597d\u4f7f\u3002<\/p>\n

1\u3001\u76ee\u5f55<\/h2>\n

1.1 \u76ee\u5f55\u7684\u6837\u5b50<\/h3>\n

\u7528\u6237\u5229\u7528\u76ee\u5f55\u6765\u7ba1\u7406\u6587\u4ef6\uff0c\u518d\u5229\u7528\u6587\u4ef6\u6765\u4f7f\u7528\u78c1\u76d8\uff0c\u8fd9\u6837\u5728\u7528\u6237\u770b\u6765\u4e00\u4e2a\u78c1\u76d8\u5c31\u663e\u5f97\u4e95\u7136\u6709\u5e8f\u4e86\u3002\u76ee\u5f55\uff0c\u8868\u793a\u4e00\u4e2a\u6587\u4ef6\u96c6\u5408\u3002<\/p>\n

\u7528\u6237\u6253\u5f00\u76ee\u5f55\u5c31\u80fd\u591f\u77e5\u9053\u76ee\u5f55\u4e0b\u6709\u54ea\u4e9b\u6587\u4ef6\u3002\u56e0\u6b64\u76ee\u5f55\u9700\u8981\u8bb0\u5f55\u81ea\u5df1\u540d\u4e0b\u6709\u54ea\u4e9b\u6587\u4ef6\u3002\u4e0a\u4e00\u7ae0\u4ecb\u7ecd\u4e86\u5982\u4f55\u901a\u8fc7\u76ee\u5f55\u9879\u627e\u5230\u6587\u4ef6\u7684 inode \uff0c\u7136\u540e\u901a\u8fc7 inode \u627e\u5230\u6587\u4ef6\u5728\u78c1\u76d8\u4e2d\u7684\u5b58\u653e\u4f4d\u7f6e\u3002\u76ee\u5f55\u53ea\u8981\u5b58\u653e\u81ea\u5df1\u540d\u4e0b\u7684\u6240\u6709\u6587\u4ef6\u7684\u76ee\u5f55\u9879\u6216\u8005 inode \u5c31\u53ef\u4ee5\u4e86\u3002\u663e\u7136\u6587\u4ef6\u7684 inode \u592a\u5927\uff0c\u76ee\u5f55\u9879\u8f83\u5c0f\uff0c\u4e14\u8f83\u4e3a\u7075\u6d3b\uff0c\u6240\u4ee5\u76ee\u5f55\u5b58\u653e\u76ee\u5f55\u9879\u66f4\u4e3a\u5408\u9002\u3002<\/p>\n

\u7531\u4e8e\u76ee\u5f55\u5b58\u653e\u4e86\u81ea\u5df1\u540d\u4e0b\u6240\u6709\u6587\u4ef6\u7684\u76ee\u5f55\u9879\uff0c\u56e0\u6b64\u4e5f\u53ef\u4ee5\u5c06\u76ee\u5f55\u770b\u6210\u4e00\u4e2a\u6587\u4ef6<\/strong>\uff0c\u770b\u6210\u4e00\u4e2a\u5b58\u653e\u6587\u4ef6\u76ee\u5f55\u9879\u7684\u6587\u4ef6\u3002 \u4e3a\u4e86\u9632\u6b62\u6df7\u6dc6\uff0c\u672c\u7ae0\u4f1a\u5c06\u76ee\u5f55\u4e5f\u53eb\u505a\u76ee\u5f55\u6587\u4ef6\u3002\u65e2\u7136\u76ee\u5f55\u6587\u4ef6\u4e5f\u662f\u4e00\u4e2a\u6587\u4ef6\uff0c\u90a3\u4e48\u76ee\u5f55\u6587\u4ef6\u4e5f\u5e94\u8be5\u5b58\u653e\u5728\u78c1\u76d8\u4e2d\uff0c\u5e76\u4e14\u64cd\u4f5c\u7cfb\u7edf\u4e5f\u662f\u6839\u636e\u76ee\u5f55\u9879\u548c inode \u6765\u5bfb\u627e\u76ee\u5f55\u6587\u4ef6\u3002i_mode \u662f inode \u4e2d\u7684\u4e00\u4e2a\u6210\u5458\uff08\u5b57\u6bb5\uff09\uff0c\u5b83\u5b58\u653e\u4e86 inode \u6240\u6307\u5411\u7684\u6587\u4ef6\u7684\u6587\u4ef6\u7c7b\u578b\uff1aFIFO\u6587\u4ef6\u3001\u5b57\u7b26\u8bbe\u5907\u6587\u4ef6\u3001\u76ee\u5f55\u6587\u4ef6\u3001\u666e\u901a\u6587\u4ef6\u7b49\u3002\u5229\u7528 i_mode \u53ef\u4ee5\u5c06\u666e\u901a\u6587\u4ef6\u548c\u76ee\u5f55\u6587\u4ef6\u533a\u5206\u5f00\u6765\uff0c\u64cd\u4f5c\u7cfb\u7edf\u5728\u8bc6\u522b\u672c\u6b21\u8bbf\u95ee\u7684\u6587\u4ef6\u4e3a\u76ee\u5f55\u6587\u4ef6\u65f6\u64cd\u4f5c\u7cfb\u7edf\u53ea\u9700\u8981\u6309\u7167\u76ee\u5f55\u6587\u4ef6\u5b58\u653e\u7684\u5185\u5bb9\u53bb\u89e3\u6790\u76ee\u5f55\u6587\u4ef6\u5373\u53ef\u3002<\/p>\n

1.2 \u76ee\u5f55\u7684\u4f7f\u7528<\/h3>\n

\u4ece1.1\u8282\u7684\u4ecb\u7ecd\u53ef\u4ee5\u770b\u51fa\uff0c\u76ee\u5f55\u7684\u4f7f\u7528\u5173\u952e\u5728\u4e8e\u76ee\u5f55\u7684\u89e3\u6790\u3002\u672c\u6587\u5c06\u4ee5\u89e3\u6790 \u201c\/my\/a\u201d \u4e3a\u4f8b\u4ecb\u7ecd\u76ee\u5f55\u7684\u4f7f\u7528\u65b9\u6cd5\u3002\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n

\"img\"<\/p>\n

\u56fe\u4e2d\u7684\u6570\u5b57\u8868\u793a\u89e3\u6790\u7684\u987a\u5e8f\uff0c\u9996\u5148\u64cd\u4f5c\u7cfb\u7edf\u8981\u4ece\u78c1\u76d8\u4e2d\u8bfb\u5165\u6839\u76ee\u5f55\u6587\u4ef6\u7684 inode \uff0c\u7136\u540e\u6839\u636e inode \u627e\u5230\u6839\u76ee\u5f55\u6587\u4ef6\uff08\u4e5f\u5c31\u662f\u56fe\u4e2d\u6807\u8bc6\u7684\u6839\u76ee\u5f55\uff09\uff0c\u7136\u540e\u5728\u5c06\u5176\u4e2d\u7684my\u76ee\u5f55\u9879\u8bfb\u5165\u5185\u5b58\uff0c\u627e\u5230 my\u76ee\u5f55\u6587\u4ef6\u7684 inode \u2026 \u3002\u64cd\u4f5c\u7cfb\u7edf\u83b7\u5f97\u4e00\u4e2a\u6587\u4ef6\u90fd\u662f\u4ece\u6839\u76ee\u5f55\u5f00\u59cb\u89e3\u6790\u6700\u540e\u627e\u5230\u6240\u9700\u6587\u4ef6\u7684\u76d8\u5757\u4f4d\u7f6e\uff0c\u53ef\u4ee5\u770b\u51fa\u89e3\u6790\u7684\u5173\u952e\u5728\u4e8e\u6839\u76ee\u5f55\u7684 inode \u3002\u56e0\u6b64\u6839\u76ee\u5f55\u7684 inode \u5fc5\u987b\u5b58\u653e\u5728\u78c1\u76d8\u7684\u56fa\u5b9a\u4f4d\u7f6e\u3002<\/p>\n

2\u3001\u6587\u4ef6\u7cfb\u7edf<\/h2>\n

\uff08\u5bf9\u4e8e\u6587\u4ef6\u7cfb\u7edf\uff0c\u7279\u522b\u662f\u6587\u4ef6\u7cfb\u7edf\u7ec4\u6210\u4e0e\u5b9a\u4e49\uff0c\u6211\u6ca1\u6709\u627e\u5230\u4e00\u4e2a\u901a\u4fd7\u7684\u3001\u8be6\u7ec6\u7684\u4ecb\u7ecd\u3002\u672c\u8282\u53ea\u80fd\u6682\u65f6\u6839\u636e\u8bfe\u7a0b\u6240\u8bb2\u4ee5\u53ca\u81ea\u5df1\u7684\u7406\u89e3\u6765\u4ecb\u7ecd\u6587\u4ef6\u7cfb\u7edf\u3002\u5728\u627e\u5230\u4e4b\u540e\u5173\u4e8e\u6587\u4ef6\u7cfb\u7edf\u597d\u7684\u4ecb\u7ecd\u540e\u518d\u8865\u5145\u672c\u8282\u5185\u5bb9\u3002\u82e5\u5927\u5bb6\u5bf9\u6587\u4ef6\u7cfb\u7edf\u6709\u4ec0\u4e48\u66f4\u597d\u7684\u7406\u89e3\uff0c\u4e5f\u5e0c\u671b\u5927\u5bb6\u80fd\u591f\u4e0d\u541d\u8d50\u6559\uff0c\u53ef\u4ee5\u53d1\u5728\u8bc4\u8bba\u533a\u4e2d O(\u2229_\u2229)O \uff09<\/p>\n

\u6587\u4ef6\u7cfb\u7edf\u7684\u5de5\u4f5c\u5c31\u662f\u8981\u5c06\u78c1\u76d8\u62bd\u8c61\u6210\u201c\u76ee\u5f55\u6811\u201d\u7684\u7ed3\u6784\uff0c\u8ba9\u7528\u6237\u4e0d\u518d\u5173\u5fc3\u6247\u533a\uff0c\u76d8\u5757\u7b49\u6982\u5ff5\u3002\u5728\u4e0a\u4e00\u8282\u4e2d\u5df2\u7ecf\u5efa\u7acb\u8d77\u4e00\u4e2a\u7b80\u5355\u7684\u201c\u76ee\u5f55\u6811\u201d\uff0c\u53ef\u4ee5\u770b\u51fa\u64cd\u4f5c\u7cfb\u7edf\u65e0\u6cd5\u5355\u9760\u81ea\u8eab\u5c06\u8fd9\u9897\u201c\u76ee\u5f55\u6811\u201d\u5efa\u7acb\uff0c\u5b83\u8fd8\u9700\u8981\u6709\u78c1\u76d8\u4e00\u4e9b\u786c\u6027\u7684\u89c4\u5b9a\uff0c\u6bd4\u5982\u9700\u8981\u78c1\u76d8\u89c4\u5b9a\u6839\u76ee\u5f55\u7684 inode \u6240\u5728\u7684\u4f4d\u7f6e\u3002<\/p>\n

\u4e3a\u4e86\u8ba9\u4e0d\u540c\u7cfb\u7edf\u7684\u8ba1\u7b97\u673a\u90fd\u80fd\u5efa\u7acb\u51fa\u201c\u76ee\u5f55\u6811\u201d\u7ed3\u6784\uff0c\u78c1\u76d8\u5fc5\u987b\u505a\u4e00\u4e9b\u786c\u6027\u7684\u89c4\u5b9a\uff08\u6216\u8005\u8bf4\u5e03\u5c40\uff09\u3002\u8fd9\u6837\u4e0d\u540c\u7684\u64cd\u4f5c\u7cfb\u7edf\u5c31\u80fd\u6839\u636e\u78c1\u76d8\u7684\u8fd9\u4e9b\u89c4\u5b9a\u89e3\u6790\u51fa\u78c1\u76d8\uff0c\u5e76\u5efa\u7acb\u51fa\u7528\u4e8e\u4f7f\u7528\u78c1\u76d8\u7684\u201c\u76ee\u5f55\u6811\u201d\u3002\u4e0b\u56fe\u4e3a Linux0.11 \u6240\u4f7f\u7528\u7684\u78c1\u76d8\u7684\u5e03\u5c40\uff1a<\/p>\n

\"img\"<\/p>\n

\u6839\u636e\u4ee5\u4e0a\u7684\u78c1\u76d8\u5e03\u5c40\u7ed3\u5408\u7b2c1\u8282\u6240\u8bb2\uff0c\u4e00\u9897\u201c\u76ee\u5f55\u6811\u201d\u5c31\u53ef\u4ee5\u5efa\u7acb\u8d77\u6765\u4e86\u3002<\/p>\n

3\u3001\u76ee\u5f55\u89e3\u6790\u4ee3\u7801\u5b9e\u73b0<\/h2>\n

open() \u51fd\u6570\u662f\u5b9e\u73b0\u76ee\u5f55\u89e3\u6790\u7684\u5173\u952e\uff0c\u5728\u4e0a\u4e00\u7ae0\u4e2d\u53ea\u662f\u7b80\u5355\u7684\u4ecb\u7ecd\u4e86 open() \u5982\u4f55\u5c06\u6587\u4ef6\u540d\u6620\u5c04\u6210\u6587\u4ef6\u5bf9\u4e8e\u7684 inode\uff0c\u672c\u8282\u4f1a\u5bf9 open() \u51fd\u6570\u8fdb\u884c\u66f4\u52a0\u8be6\u7ec6\u7684\u5206\u6790\u3002<\/p>\n

open() \u7684\u662f\u901a\u8fc7 sys_open() \u5b9e\u73b0\u7684\uff0c\u5728 sys_open() \u4e2d\u8c03\u7528\u4e86 open_namei() \uff0c\u5728 open_namei() \u4e2d\u53c8\u8c03\u7528\u4e86 dir_namei() \uff0c\u6700\u540e dir_namei() \u4e2d\u53c8\u8c03\u7528\u4e86 get_dir() \uff0c\u800c get_dir() \u662f\u771f\u6b63\u5b8c\u6210\u76ee\u5f55\u89e3\u6790\u7684\u7a0b\u5e8f\uff1a<\/p>\n

\/\/ \u641c\u7d22\u6307\u5b9a\u8def\u5f84\u540d\u7684\u6587\u4ef6\u540d\uff08\u6216\u76ee\u5f55\uff09\u7684 inode\n\/\/ pathname - \u8def\u5f84\u540d\nstatic struct m_inode * get_dir(const char * pathname)\n{\n\tchar c;\n\tconst char * thisname;\n\tstruct m_inode * inode;\n\tstruct buffer_head * bh;\n\tint namelen,inr,idev;\n\tstruct dir_entry * de;\n\n\tif (!current->root || !current->root->i_count)\n\t\tpanic(\"No root inode\");\n\tif (!current->pwd || !current->pwd->i_count)\n\t\tpanic(\"No cwd inode\");\n\tif ((c=get_fs_byte(pathname))=='\/') {    \/\/ \u82e5\u4e3a\u7edd\u5bf9\u8def\u5f84\uff0c\u5219\u4ece\u6839\u76ee\u5f55\u5f00\u59cb\u89e3\u6790\n\t    \/\/ current->root \u662f\u6839\u76ee\u5f55\u7684 inode\uff0c\u6839\u76ee\u5f55\u7684inode\u653e\u5728\u78c1\u76d8\u7684\u56fa\u5b9a\u4f4d\u7f6e\n\t\t\/\/ init\u8fdb\u7a0b ( setup((void *) &drive_info); )\u5c06\u6839\u76ee\u5f55\u7684 inode \u8bfb\u5165\u5185\u5b58\uff0c\n\t\t\/\/ \u4e4b\u540e\u6240\u6709\u5b50\u8fdb\u7a0b\u90fd\u7ee7\u627f\u4e86 init \u8fdb\u7a0b\u7684\u6839\u76ee\u5f55\u7684 inode\n\t\tinode = current->root;\n\t\tpathname++;\n\t} else if (c)\/\/\u7b2c\u4e00\u4e2a\u5b57\u7b26\u4e0d\u4e3a'\/'\uff0c\u5219\u4f7f\u7528\u76f8\u5bf9\u8def\u5f84\u89e3\u6790\n\t\tinode = current->pwd;\n\telse\n\t\treturn NULL;\t\/* empty name is bad *\/\n\tinode->i_count++;   \/\/ \u5c06 inode \u7684\u5f15\u7528\u8ba1\u6570\u52a01\n\twhile (1) {         \/\/ \u6b63\u5f0f\u5f00\u59cb\u89e3\u6790\u76ee\u5f55\n\t\tthisname = pathname;\n\t\tif (!S_ISDIR(inode->i_mode) || !permission(inode,MAY_EXEC)) {\n\t\t\tiput(inode);\n\t\t\treturn NULL;\n\t\t}\n\t\t\/\/ \u83b7\u53d6\u6587\u4ef6\u540d\u6216\u76ee\u5f55\u540d\n\t\tfor(namelen=0;(c=get_fs_byte(pathname++))&&(c!='\/');namelen++)\n\t\t\t\/* nothing *\/ ;\n\t\tif (!c)\n\t\t\treturn inode;\n\t\t\/\/ find_entry() \u5c06\u4ece\u76ee\u5f55\u4e2d\u8bfb\u53d6\u76ee\u5f55\u9879\n\t\tif (!(bh = find_entry(&inode,thisname,namelen,&de))) {\n\t\t\tiput(inode);\n\t\t\treturn NULL;\n\t\t}\n\t\tinr = de->inode;\/\/ inr \u662f\u76ee\u5f55\u9879\u4e2d\u7684\u7d22\u5f15\u8282\u70b9\u53f7\n\t\tidev = inode->i_dev;\n\t\tbrelse(bh);\n\t\tiput(inode);\n\t\tif (!(inode = iget(idev,inr))) \/\/ iget(),\u518d\u8bfb\u4e0b\u4e00\u5c42\u76ee\u5f55\n\t\t\treturn NULL;\n\t}\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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