{"id":208384,"date":"2025-08-26T10:25:11","date_gmt":"2025-08-26T02:25:11","guid":{"rendered":"https:\/\/www.server.hk\/blog\/?p=208384"},"modified":"2025-08-26T10:25:11","modified_gmt":"2025-08-26T02:25:11","slug":"%e6%b7%b1%e5%85%a5%e7%90%86%e8%a7%a3-linux-%e6%96%87%e4%bb%b6%e7%b3%bb%e7%bb%9f%e6%8c%82%e8%bd%bd%ef%bc%9avfs-%e4%b8%8e-ext2-%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/208384\/","title":{"rendered":"\u6df1\u5165\u7406\u89e3 Linux \u6587\u4ef6\u7cfb\u7edf\u6302\u8f7d\uff1aVFS \u4e0e ext2 \u8be6\u89e3"},"content":{"rendered":"<p dir=\"auto\">\u672c\u6587\u63a2\u8ba8\u4e86 Linux \u6587\u4ef6\u7cfb\u7edf\u6302\u8f7d\u7684\u590d\u6742\u673a\u5236\uff0c\u91cd\u70b9\u5206\u6790\u865a\u62df\u6587\u4ef6\u7cfb\u7edf\uff08VFS\uff09\u5c42\u548c ext2 \u6587\u4ef6\u7cfb\u7edf\u3002\u672c\u6587\u4e3a IT \u4e13\u4e1a\u4eba\u58eb\u63d0\u4f9b\u4e86\u4e00\u4e2a\u8be6\u7ec6\u7684\u6280\u672f\u8bb2\u89e3\uff0c\u6db5\u76d6\u6302\u8f7d\u8fc7\u7a0b\u3001\u5173\u952e VFS \u6570\u636e\u7ed3\u6784\u53ca\u5176\u4ea4\u4e92\uff0c\u4f18\u5316\u4e86\u6280\u672f\u53d7\u4f17\u7684\u9605\u8bfb\u4f53\u9a8c\u3002<\/p>\n<h2 dir=\"auto\">\u5f15\u8a00<\/h2>\n<p dir=\"auto\">\u5728 Linux \u4e2d\uff0c\u6302\u8f7d\u6587\u4ef6\u7cfb\u7edf\u662f\u5c06\u5757\u8bbe\u5907\u4e0a\u7684\u6587\u4ef6\u7cfb\u7edf\u9644\u7740\u5230\u7cfb\u7edf\u76ee\u5f55\u6811\u4e2d\u7684\u67d0\u4e2a\u76ee\u5f55\uff0c\u4ece\u800c\u5141\u8bb8\u7528\u6237\u8bbf\u95ee\u6587\u4ef6\u7684\u64cd\u4f5c\u3002\u8fd9\u4e00\u8fc7\u7a0b\u7531 Linux \u5185\u6838\u534f\u8c03\uff0c\u6d89\u53ca VFS \u5c42\u4e0e\u5177\u4f53\u6587\u4ef6\u7cfb\u7edf\u5b9e\u73b0\u4e4b\u95f4\u7684\u590d\u6742\u4ea4\u4e92\u3002\u672c\u6587\u6df1\u5165\u63a2\u8ba8\u6587\u4ef6\u7cfb\u7edf\u6302\u8f7d\u7684\u6838\u5fc3\u903b\u8f91\uff0c\u4ee5 ext2 \u6587\u4ef6\u7cfb\u7edf\u4e3a\u4f8b\uff0c\u89e3\u7b54\u4e3a\u4f55\u9700\u8981\u6302\u8f7d\u4ee5\u53ca\u6302\u8f7d\u5982\u4f55\u5b9e\u73b0\u6587\u4ef6\u8bbf\u95ee\u3002<\/p>\n<p dir=\"auto\"><strong>\u73af\u5883<\/strong>\uff1a<\/p>\n<ul dir=\"auto\">\n<li>\u5904\u7406\u5668\u67b6\u6784\uff1aarm64<\/li>\n<li>\u5185\u6838\u7248\u672c\uff1aLinux 5.11<\/li>\n<li>\u64cd\u4f5c\u7cfb\u7edf\uff1aUbuntu 20.04.1<\/li>\n<li>\u5de5\u5177\uff1avim\u3001ctags\u3001cscope<\/li>\n<\/ul>\n<p dir=\"auto\">\u672c\u6587\u4e0d\u6d89\u53ca\u6302\u8f7d\u547d\u540d\u7a7a\u95f4\u548c\u7ed1\u5b9a\u6302\u8f7d\u7b49\u9ad8\u7ea7\u4e3b\u9898\uff0c\u4ec5\u805a\u7126\u4e8e\u4ee5 ext2 \u4e3a\u4f8b\u7684\u57fa\u7840\u6302\u8f7d\u8fc7\u7a0b\u3002<\/p>\n<h2 dir=\"auto\">\u5173\u952e VFS \u6570\u636e\u7ed3\u6784<\/h2>\n<p dir=\"auto\">VFS \u5c42\u62bd\u8c61\u4e86\u5404\u79cd\u6587\u4ef6\u7cfb\u7edf\u7684\u901a\u7528\u529f\u80fd\uff0c\u4e3a\u7528\u6237\u8fdb\u7a0b\u63d0\u4f9b\u7edf\u4e00\u63a5\u53e3\uff0c\u5e76\u5c4f\u853d\u5177\u4f53\u6587\u4ef6\u7cfb\u7edf\u7684\u5b9e\u73b0\u7ec6\u8282\u3002\u4ee5\u4e0b\u662f\u6302\u8f7d\u8fc7\u7a0b\u4e2d\u6d89\u53ca\u7684\u5173\u952e VFS \u6570\u636e\u7ed3\u6784\uff1a<\/p>\n<h3 dir=\"auto\">1. file_system_type<\/h3>\n<ul dir=\"auto\">\n<li><strong>\u4f5c\u7528<\/strong>\uff1a\u5b9a\u4e49\u6587\u4ef6\u7cfb\u7edf\u7c7b\u578b\uff0c\u6307\u5b9a\u6302\u8f7d\u548c\u5378\u8f7d\u65b9\u6cd5\u3002<\/li>\n<li><strong>\u529f\u80fd<\/strong>\uff1a\u7531\u5177\u4f53\u6587\u4ef6\u7cfb\u7edf\uff08\u5982 ext2\uff09\u6ce8\u518c\uff0c\u7528\u4e8e\u5728\u6302\u8f7d\u65f6\u521b\u5efa\u8d85\u7ea7\u5757\u548c\u6839\u76ee\u5f55\u9879\u5bf9\u8c61\u3002<\/li>\n<li><strong>\u6587\u4ef6\u7cfb\u7edf\u5206\u7c7b<\/strong>\uff1a\n<ul dir=\"auto\">\n<li><strong>\u78c1\u76d8\u6587\u4ef6\u7cfb\u7edf<\/strong>\uff1a\u6301\u4e45\u5b58\u50a8\uff08\u5982 ext2\u3001ext4\u3001xfs\uff09\u3002<\/li>\n<li><strong>\u5185\u5b58\u6587\u4ef6\u7cfb\u7edf<\/strong>\uff1a\u6613\u5931\u6027\u5b58\u50a8\uff08\u5982 tmpfs\uff09\u3002<\/li>\n<li><strong>\u4f2a\u6587\u4ef6\u7cfb\u7edf<\/strong>\uff1a\u5185\u6838\u63a5\u53e3\uff08\u5982 proc\u3001sysfs\u3001sockfs\u3001bdev\uff09\u3002<\/li>\n<li><strong>\u7f51\u7edc\u6587\u4ef6\u7cfb\u7edf<\/strong>\uff1a\u8fdc\u7a0b\u6570\u636e\u8bbf\u95ee\uff08\u5982 NFS\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u6e90\u7801\u8def\u5f84<\/strong>\uff1ainclude\/linux\/fs.h\uff08\u7ea6\u7b2c 2226 \u884c\uff09<\/li>\n<\/ul>\n<h3 dir=\"auto\">2. super_block<\/h3>\n<ul dir=\"auto\">\n<li><strong>\u4f5c\u7528<\/strong>\uff1a\u8868\u793a\u5757\u8bbe\u5907\u4e0a\u6587\u4ef6\u7cfb\u7edf\u7684\u5143\u6570\u636e\uff08\u5982\u5757\u5927\u5c0f\u3001\u6700\u5927\u6587\u4ef6\u5927\u5c0f\u3001\u9b54\u6570\uff09\u3002<\/li>\n<li><strong>\u7279\u70b9<\/strong>\uff1a\u4e00\u4e2a\u6587\u4ef6\u7cfb\u7edf\u5728\u5185\u5b58\u4e2d\u4ec5\u6709\u4e00\u4e2a\u8d85\u7ea7\u5757\u5b9e\u4f8b\uff0c\u5373\u4f7f\u88ab\u591a\u6b21\u6302\u8f7d\uff08\u5bf9\u78c1\u76d8\u6587\u4ef6\u7cfb\u7edf\u800c\u8a00\uff09\u3002<\/li>\n<li><strong>\u6e90\u7801\u8def\u5f84<\/strong>\uff1ainclude\/linux\/fs.h\uff08\u7ea6\u7b2c 1414 \u884c\uff09<\/li>\n<\/ul>\n<h3 dir=\"auto\">3. mount<\/h3>\n<ul dir=\"auto\">\n<li><strong>\u4f5c\u7528<\/strong>\uff1a\u63cf\u8ff0\u4e00\u6b21\u6302\u8f7d\u64cd\u4f5c\uff0c\u8fde\u63a5\u8d85\u7ea7\u5757\u4e0e\u6302\u8f7d\u70b9\u3002<\/li>\n<li><strong>\u7279\u70b9<\/strong>\uff1a\u6bcf\u6b21\u6302\u8f7d\u64cd\u4f5c\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u552f\u4e00\u7684\u6302\u8f7d\u5bf9\u8c61\u3002<\/li>\n<li><strong>\u6e90\u7801\u8def\u5f84<\/strong>\uff1afs\/mount.h\uff08\u7ea6\u7b2c 39 \u884c\uff09<\/li>\n<\/ul>\n<h3 dir=\"auto\">4. inode<\/h3>\n<ul dir=\"auto\">\n<li><strong>\u4f5c\u7528<\/strong>\uff1a\u5b58\u50a8\u6587\u4ef6\u6216\u76ee\u5f55\u7684\u5143\u6570\u636e\uff08\u5982\u5c5e\u6027\u3001\u4f4d\u7f6e\uff09\u3002<\/li>\n<li><strong>\u529f\u80fd<\/strong>\uff1a\u5728\u6587\u4ef6\u9996\u6b21\u8bbf\u95ee\u65f6\u521b\u5efa\uff0c\u901a\u5e38\u901a\u8fc7\u8bfb\u53d6\u78c1\u76d8\u4e0a\u7684\u7d22\u5f15\u8282\u70b9\u6570\u636e\u3002<\/li>\n<li><strong>\u6e90\u7801\u8def\u5f84<\/strong>\uff1ainclude\/linux\/fs.h\uff08\u7ea6\u7b2c 610 \u884c\uff09<\/li>\n<\/ul>\n<h3 dir=\"auto\">5. dentry<\/h3>\n<ul dir=\"auto\">\n<li><strong>\u4f5c\u7528<\/strong>\uff1a\u8868\u793a\u76ee\u5f55\u9879\uff0c\u6784\u6210\u6587\u4ef6\u7cfb\u7edf\u7684\u76ee\u5f55\u6811\u3002<\/li>\n<li><strong>\u529f\u80fd<\/strong>\uff1a\u5c06\u6587\u4ef6\u540d\u6216\u76ee\u5f55\u540d\u6620\u5c04\u5230\u7d22\u5f15\u8282\u70b9\u53f7\uff0c\u5728\u8def\u5f84\u904d\u5386\u65f6\u4e8e\u5185\u5b58\u4e2d\u521b\u5efa\u3002<\/li>\n<li><strong>\u6e90\u7801\u8def\u5f84<\/strong>\uff1ainclude\/linux\/dcache.h\uff08\u7ea6\u7b2c 90 \u884c\uff09<\/li>\n<\/ul>\n<h3 dir=\"auto\">6. file<\/h3>\n<ul dir=\"auto\">\n<li><strong>\u4f5c\u7528<\/strong>\uff1a\u8868\u793a\u8fdb\u7a0b\u6253\u5f00\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n<li><strong>\u529f\u80fd<\/strong>\uff1a\u5728\u8fdb\u7a0b\u6253\u5f00\u6587\u4ef6\u65f6\u521b\u5efa\uff0c\u52a0\u5165\u8fdb\u7a0b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868\u3002<\/li>\n<li><strong>\u6e90\u7801\u8def\u5f84<\/strong>\uff1ainclude\/linux\/fs.h\uff08\u7ea6\u7b2c 915 \u884c\uff09<\/li>\n<\/ul>\n<h2 dir=\"auto\">\u6587\u4ef6\u7cfb\u7edf\u6302\u8f7d\u6d41\u7a0b<\/h2>\n<p dir=\"auto\">\u6302\u8f7d\u8fc7\u7a0b\u6d89\u53ca\u4e00\u7cfb\u5217\u5185\u6838\u64cd\u4f5c\uff0c\u5c06\u5757\u8bbe\u5907\u7684\u6587\u4ef6\u7cfb\u7edf\u96c6\u6210\u5230\u7cfb\u7edf\u76ee\u5f55\u6811\u4e2d\u3002\u4ee5\u4e0b\u662f\u7ed3\u6784\u5316\u7684\u6d41\u7a0b\u6982\u8ff0\uff1a<\/p>\n<h3 dir=\"auto\">1. \u7cfb\u7edf\u8c03\u7528\u5904\u7406<\/h3>\n<ul dir=\"auto\">\n<li><strong>\u5165\u53e3<\/strong>\uff1amount \u7cfb\u7edf\u8c03\u7528\uff08fs\/namespace.c \u4e2d\u7684 SYSCALL_DEFINE5\uff09\u542f\u52a8\u6302\u8f7d\u6d41\u7a0b\u3002<\/li>\n<li><strong>\u53c2\u6570<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>dev_name\uff1a\u5757\u8bbe\u5907\u8def\u5f84\u3002<\/li>\n<li>dir_name\uff1a\u6302\u8f7d\u70b9\u76ee\u5f55\u3002<\/li>\n<li>type\uff1a\u6587\u4ef6\u7cfb\u7edf\u7c7b\u578b\uff08\u5982 &#8220;ext2&#8243;\uff09\u3002<\/li>\n<li>flags\uff1a\u6302\u8f7d\u9009\u9879\uff08\u5982\u53ea\u8bfb\uff09\u3002<\/li>\n<li>data\uff1a\u5176\u4ed6\u6302\u8f7d\u9009\u9879\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u6b65\u9aa4<\/strong>\uff1a\n<ol dir=\"auto\">\n<li>\u5c06\u7528\u6237\u7a7a\u95f4\u53c2\u6570\u590d\u5236\u5230\u5185\u6838\u7a7a\u95f4\u3002<\/li>\n<li>\u59d4\u6258\u7ed9 do_mount \u8fdb\u884c\u8fdb\u4e00\u6b65\u5904\u7406\u3002<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<h3 dir=\"auto\">2. \u6302\u8f7d\u70b9\u8def\u5f84\u89e3\u6790<\/h3>\n<ul dir=\"auto\">\n<li><strong>\u529f\u80fd<\/strong>\uff1auser_path_at \u5c06\u6302\u8f7d\u70b9\u76ee\u5f55\u89e3\u6790\u4e3a path \u7ed3\u6784\uff08\u5305\u542b vfsmount \u548c dentry\uff09\u3002<\/li>\n<li><strong>\u59d4\u6258<\/strong>\uff1ado_mount \u8c03\u7528 path_mount \u5904\u7406\u6302\u8f7d\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n<h3 dir=\"auto\">3. \u53c2\u6570\u9a8c\u8bc1<\/h3>\n<ul dir=\"auto\">\n<li><strong>\u529f\u80fd<\/strong>\uff1apath_mount \u9a8c\u8bc1\u8f93\u5165\u53c2\u6570\u5e76\u59d4\u6258\u7ed9 do_new_mount \u5904\u7406\u9ed8\u8ba4\u6302\u8f7d\u64cd\u4f5c\u3002<\/li>\n<li><strong>\u68c0\u67e5<\/strong>\uff1a\u786e\u4fdd\u6587\u4ef6\u7cfb\u7edf\u7c7b\u578b\u548c\u6302\u8f7d\u70b9\u6709\u6548\u3002<\/li>\n<\/ul>\n<h3 dir=\"auto\">4. \u6587\u4ef6\u7cfb\u7edf\u7279\u5b9a\u6302\u8f7d<\/h3>\n<ul dir=\"auto\">\n<li><strong>\u529f\u80fd<\/strong>\uff1ado_new_mount \u5b9a\u4f4d\u6587\u4ef6\u7cfb\u7edf\u7c7b\u578b\u5e76\u521d\u59cb\u5316\u6302\u8f7d\u4e0a\u4e0b\u6587\u3002<\/li>\n<li><strong>\u5173\u952e\u6b65\u9aa4<\/strong>\uff1a\n<ol dir=\"auto\">\n<li>\u83b7\u53d6\u6587\u4ef6\u7cfb\u7edf\u7c7b\u578b\uff08get_fs_type\uff09\u3002<\/li>\n<li>\u5206\u914d\u5e76\u521d\u59cb\u5316 fs_context \u7ed3\u6784\uff08fs_context_for_mount\uff09\u3002<\/li>\n<li>\u8c03\u7528\u6587\u4ef6\u7cfb\u7edf\u7684\u6302\u8f7d\u65b9\u6cd5\u6216\u56de\u9000\u5230 legacy_init_fs_context\u3002<\/li>\n<li>\u89e3\u6790\u6302\u8f7d\u9009\u9879\u5e76\u68c0\u67e5\u6743\u9650\uff08mount_capable\uff09\u3002<\/li>\n<li>\u8c03\u7528 vfs_get_tree \u521b\u5efa\u8d85\u7ea7\u5757\u53ca\u76f8\u5173\u7ed3\u6784\u3002<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<h3 dir=\"auto\">5. \u96c6\u6210\u5230\u5168\u5c40\u6587\u4ef6\u7cfb\u7edf\u6811<\/h3>\n<ul dir=\"auto\">\n<li><strong>\u529f\u80fd<\/strong>\uff1ado_new_mount_fc \u521b\u5efa mount \u5b9e\u4f8b\u5e76\u5c06\u5176\u4e0e\u6302\u8f7d\u70b9\u548c\u8d85\u7ea7\u5757\u5173\u8054\u3002<\/li>\n<li><strong>\u6b65\u9aa4<\/strong>\uff1a\n<ol dir=\"auto\">\n<li>\u5206\u914d vfsmount \u7ed3\u6784\uff08vfs_create_mount\uff09\u3002<\/li>\n<li>\u5173\u8054\u8d85\u7ea7\u5757\u548c\u6839\u76ee\u5f55\u9879\u3002<\/li>\n<li>\u89e3\u6790\u6302\u8f7d\u70b9\uff08lock_mount\uff09\u3002<\/li>\n<li>\u5c06\u6302\u8f7d\u6dfb\u52a0\u5230\u5168\u5c40\u6587\u4ef6\u7cfb\u7edf\u6811\uff08do_add_mount\uff09\u3002<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<h2 dir=\"auto\">ext2 \u6587\u4ef6\u7cfb\u7edf\u6302\u8f7d\u8be6\u89e3<\/h2>\n<p dir=\"auto\">\u4ee5 ext2 \u4e3a\u4f8b\uff0c\u6211\u4eec\u8be6\u7ec6\u5206\u6790\u5176\u6302\u8f7d\u8fc7\u7a0b\uff0c\u91cd\u70b9\u5173\u6ce8 vfs_get_tree \u548c ext2_fill_super\u3002<\/p>\n<h3 dir=\"auto\">1. vfs_get_tree<\/h3>\n<ul dir=\"auto\">\n<li><strong>\u4f5c\u7528<\/strong>\uff1a\u8c03\u7528\u6587\u4ef6\u7cfb\u7edf\u7684\u6302\u8f7d\u65b9\u6cd5\u521b\u5efa\u8d85\u7ea7\u5757\u3001\u6839\u7d22\u5f15\u8282\u70b9\u548c\u6839\u76ee\u5f55\u9879\u3002<\/li>\n<li><strong>\u5bf9\u4e8e ext2<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u4f7f\u7528\u4f20\u7edf\u63a5\u53e3\uff08fs\/ext2\/super.c \u4e2d\u7684 ext2_mount\uff09\u3002<\/li>\n<li>\u59d4\u6258\u7ed9 mount_bdev\uff0c\u8c03\u7528 ext2_fill_super\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3 dir=\"auto\">2. mount_bdev<\/h3>\n<ul dir=\"auto\">\n<li><strong>\u4f5c\u7528<\/strong>\uff1a\u78c1\u76d8\u6587\u4ef6\u7cfb\u7edf\u7684\u901a\u7528\u51fd\u6570\uff0c\u7528\u4e8e\u521b\u5efa VFS \u7ed3\u6784\u3002<\/li>\n<li><strong>\u6b65\u9aa4<\/strong>\uff1a\n<ol dir=\"auto\">\n<li>\u83b7\u53d6\u5757\u8bbe\u5907\u63cf\u8ff0\u7b26\uff08blkdev_get_by_path\uff09\u3002<\/li>\n<li>\u68c0\u67e5\u662f\u5426\u5b58\u5728\u8d85\u7ea7\u5757\uff08sget\uff09\u6216\u521b\u5efa\u65b0\u8d85\u7ea7\u5757\u3002<\/li>\n<li>\u8bbe\u7f6e\u5757\u5927\u5c0f\uff08sb_set_blocksize\uff09\u3002<\/li>\n<li>\u8c03\u7528 ext2_fill_super \u586b\u5145\u8d85\u7ea7\u5757\u3002<\/li>\n<li>\u8fd4\u56de\u6839\u76ee\u5f55\u9879\u3002<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<h3 dir=\"auto\">3. ext2_fill_super<\/h3>\n<ul dir=\"auto\">\n<li><strong>\u4f5c\u7528<\/strong>\uff1a\u7528 ext2 \u7279\u5b9a\u7684\u5143\u6570\u636e\u586b\u5145 VFS \u8d85\u7ea7\u5757\u3002<\/li>\n<li><strong>\u5173\u952e\u64cd\u4f5c<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u5206\u914d ext2 \u4e13\u7528\u8d85\u7ea7\u5757\u7ed3\u6784\uff08ext2_sb_info\uff09\u3002<\/li>\n<li>\u8bfb\u53d6\u78c1\u76d8\u8d85\u7ea7\u5757\u5230\u7f13\u51b2\u533a\uff08sb_bread\uff09\u3002<\/li>\n<li>\u9a8c\u8bc1\u6587\u4ef6\u7cfb\u7edf\u9b54\u6570\uff08EXT2_SUPER_MAGIC = 0xEF53\uff09\u3002<\/li>\n<li>\u8bbe\u7f6e\u5757\u5927\u5c0f\u3001\u7d22\u5f15\u8282\u70b9\u5927\u5c0f\u548c\u7ec4\u63cf\u8ff0\u7b26\u3002<\/li>\n<li>\u8bfb\u53d6\u6839\u7d22\u5f15\u8282\u70b9\uff08ext2_iget\uff09\u5e76\u521b\u5efa\u6839\u76ee\u5f55\u9879\uff08d_make_root\uff09\u3002<\/li>\n<li>\u66f4\u65b0\u78c1\u76d8\u4e0a\u7684\u8d85\u7ea7\u5757\u5143\u6570\u636e\uff08ext2_write_super\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3 dir=\"auto\">4. \u6302\u8f7d\u70b9\u5173\u8054<\/h3>\n<ul dir=\"auto\">\n<li><strong>\u529f\u80fd<\/strong>\uff1ado_new_mount_fc \u5c06\u6587\u4ef6\u7cfb\u7edf\u96c6\u6210\u5230\u76ee\u5f55\u6811\u4e2d\u3002<\/li>\n<li><strong>\u5173\u952e\u6b65\u9aa4<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u5206\u914d vfsmount\uff08vfs_create_mount\uff09\u3002<\/li>\n<li>\u89e3\u6790\u6302\u8f7d\u70b9\uff08lock_mount\uff09\uff1a\n<ul dir=\"auto\">\n<li>\u5982\u679c\u76ee\u5f55\u4e0d\u662f\u6302\u8f7d\u70b9\uff0c\u4f7f\u7528\u5176\u76ee\u5f55\u9879\u3002<\/li>\n<li>\u5982\u679c\u662f\u6302\u8f7d\u70b9\uff0c\u4f7f\u7528\u6700\u540e\u6302\u8f7d\u7684\u6587\u4ef6\u7cfb\u7edf\u7684\u6839\u76ee\u5f55\u9879\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u5c06\u6302\u8f7d\u5b9e\u4f8b\u94fe\u63a5\u5230\u5168\u5c40\u6811\uff08do_add_mount\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2 dir=\"auto\">\u8def\u5f84\u540d\u67e5\u627e\u4e0e\u6302\u8f7d\u70b9<\/h2>\n<p dir=\"auto\">\u5f53\u7528\u6237\u8bbf\u95ee\u6587\u4ef6\uff08\u5982 \/mnt\/test\/file.txt\uff09\u65f6\uff0c\u5185\u6838\u6267\u884c\u8def\u5f84\u540d\u67e5\u627e\uff1a<\/p>\n<ul dir=\"auto\">\n<li><strong>\u529f\u80fd<\/strong>\uff1afs\/namei.c \u4e2d\u7684 walk_component \u5904\u7406\u8def\u5f84\u904d\u5386\u3002<\/li>\n<li><strong>\u6302\u8f7d\u70b9\u5904\u7406<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u68c0\u67e5\u76ee\u5f55\u9879\u662f\u5426\u4e3a\u6302\u8f7d\u70b9\uff08DCACHE_MOUNTED \u6807\u5fd7\uff09\u3002<\/li>\n<li>\u4f7f\u7528 lookup_mnt \u67e5\u627e\u5b50\u6587\u4ef6\u7cfb\u7edf\u7684 vfsmount\u3002<\/li>\n<li>\u66f4\u65b0\u8def\u5f84\u5230\u5b50\u6587\u4ef6\u7cfb\u7edf\u7684\u6839\u76ee\u5f55\u9879\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u793a\u4f8b<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u6302\u8f7d\uff1a\/dev\/sda1 \u2192 \/mnt\u3001\/dev\/sda2 \u2192 \/mnt\u3001\/dev\/sda3 \u2192 \/mnt\u3002<\/li>\n<li>\u67e5\u627e \/mnt\/test\/file.txt\uff1a\n<ol dir=\"auto\">\n<li>\u5230\u8fbe \/mnt\uff08\u6302\u8f7d\u70b9\uff09\u3002<\/li>\n<li>\u904d\u5386\u5230 \/dev\/sda3 \u7684\u6839\u76ee\u5f55\u9879\u3002<\/li>\n<li>\u5728 \/dev\/sda3 \u5185\u7ee7\u7eed\u89e3\u6790 test\/file.txt\u3002<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2 dir=\"auto\">\u5173\u952e\u6d1e\u5bdf<\/h2>\n<ul dir=\"auto\">\n<li><strong>\u6302\u8f7d\u5fc5\u8981\u6027<\/strong>\uff1a\u6587\u4ef6\u7cfb\u7edf\u5fc5\u987b\u6302\u8f7d\u5230\u76ee\u5f55\u4ee5\u4f9b\u7528\u6237\u8bbf\u95ee\uff0c\u4f7f\u8def\u5f84\u540d\u67e5\u627e\u80fd\u591f\u89e3\u6790\u5230\u6587\u4ef6\u7cfb\u7edf\u6839\u76ee\u5f55\u3002<\/li>\n<li><strong>\u5355\u4e00\u8d85\u7ea7\u5757<\/strong>\uff1a\u4e00\u4e2a\u5757\u8bbe\u5907\u7684\u6587\u4ef6\u7cfb\u7edf\u5728\u5185\u5b58\u4e2d\u53ea\u6709\u4e00\u4e2a\u8d85\u7ea7\u5757\uff0c\u65e0\u8bba\u6302\u8f7d\u5230\u591a\u4e2a\u6302\u8f7d\u70b9\u3002<\/li>\n<li><strong>\u6302\u8f7d\u70b9\u9690\u85cf<\/strong>\uff1a\u5728\u76ee\u5f55\u4e0a\u6302\u8f7d\u65b0\u6587\u4ef6\u7cfb\u7edf\u4f1a\u9690\u85cf\u4e4b\u524d\u7684\u6587\u4ef6\u7cfb\u7edf\u6216\u5185\u5bb9\uff0c\u76f4\u5230\u5378\u8f7d\u3002<\/li>\n<li><strong>VFS \u62bd\u8c61<\/strong>\uff1aVFS \u5c42\u786e\u4fdd\u4e0d\u540c\u6587\u4ef6\u7cfb\u7edf\u7684\u65e0\u7f1d\u96c6\u6210\uff0c\u5bf9\u7528\u6237\u900f\u660e\u3002<\/li>\n<\/ul>\n<h2 dir=\"auto\">\u7ed3\u8bba<\/h2>\n<p dir=\"auto\">Linux \u4e2d\u7684\u6587\u4ef6\u7cfb\u7edf\u6302\u8f7d\u662f\u4e00\u4e2a\u590d\u6742\u7684\u8fc7\u7a0b\uff0c\u901a\u8fc7 VFS \u5c42\u5c06\u5757\u8bbe\u5907\u96c6\u6210\u5230\u76ee\u5f55\u6811\u4e2d\u3002\u901a\u8fc7\u521b\u5efa\u548c\u5173\u8054\u8d85\u7ea7\u5757\u3001\u6302\u8f7d\u3001\u7d22\u5f15\u8282\u70b9\u548c\u76ee\u5f55\u9879\u7b49\u5173\u952e\u7ed3\u6784\uff0c\u5185\u6838\u5b9e\u73b0\u4e86\u65e0\u7f1d\u7684\u6587\u4ef6\u8bbf\u95ee\u3002\u4ee5 ext2 \u4e3a\u4f8b\u8bf4\u660e\u4e86\u78c1\u76d8\u6587\u4ef6\u7cfb\u7edf\u7684\u6302\u8f7d\u8fc7\u7a0b\uff0c\u7a81\u663e\u4e86 VFS \u4e0e\u6587\u4ef6\u7cfb\u7edf\u7279\u5b9a\u903b\u8f91\u7684\u4ea4\u4e92\u3002\u5bf9\u4e8e\u7cfb\u7edf\u7ba1\u7406\u5458\u548c\u5185\u6838\u5f00\u53d1\u8005\u6765\u8bf4\uff0c\u7406\u89e3\u8fd9\u4e9b\u673a\u5236\u5bf9\u4e8e\u7ba1\u7406 Linux \u6587\u4ef6\u7cfb\u7edf\u81f3\u5173\u91cd\u8981\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u6587\u63a2\u8ba8\u4e86 Linux \u6587\u4ef6\u7cfb\u7edf&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4924],"tags":[],"class_list":["post-208384","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/208384","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=208384"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/208384\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=208384"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=208384"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=208384"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}