{"id":4085,"date":"2012-07-24T16:47:34","date_gmt":"2012-07-24T08:47:34","guid":{"rendered":"http:\/\/edsionte.com\/techblog\/?p=4085"},"modified":"2012-07-31T15:43:29","modified_gmt":"2012-07-31T07:43:29","slug":"%e5%9d%97%e7%bc%93%e5%86%b2%e5%8c%ba%e5%92%8c%e5%9d%97%e7%bc%93%e5%86%b2%e5%8c%ba%e5%a4%b4","status":"publish","type":"post","link":"http:\/\/edsionte.com\/techblog\/archives\/4085","title":{"rendered":"\u5757\u7f13\u51b2\u533a\u548c\u5757\u7f13\u51b2\u533a\u5934"},"content":{"rendered":"<p>\u5728\u8be6\u7ec6\u8bf4\u660e\u5757\u7f13\u51b2\u533a\u548c\u5757\u7f13\u51b2\u533a\u5934\u4e4b\u524d\uff0c\u6211\u4eec\u5148\u6765\u770b\u4e00\u4e0b\u5757\u8bbe\u5907\u4e2d\u7684\u4e24\u4e2a\u57fa\u672c\u6982\u5ff5\uff1a\u6247\u533a\u548c\u5757\u3002<\/p>\n<p>\u6247\u533a\u662f\u5757\u8bbe\u5907\u4f20\u8f93\u6570\u636e\u7684\u57fa\u672c\u5355\u5143\uff0c\u4e5f\u5c31\u662f\u8bf4\u5b83\u662f\u5757\u8bbe\u5907\u4e2d\u6700\u5c0f\u7684\u5bfb\u5740\u5355\u4f4d\uff0c\u6247\u533a\u901a\u5e38\u7684\u5927\u5c0f\u4e3a512B\u3002\u5757\u662f\u5185\u6838\u5bf9\u6587\u4ef6\u7cfb\u7edf\u7684\u4e00\u79cd\u62bd\u8c61\uff0c\u4e5f\u5c31\u662f\u8bf4\u5185\u6838\u6267\u884c\u7684\u6240\u6709\u78c1\u76d8\u64cd\u4f5c\u90fd\u662f\u4ee5\u5757\u4e3a\u57fa\u672c\u5355\u4f4d\u7684\u3002\u53ef\u4ee5\u7b80\u5355\u7684\u5c06\u6247\u533a\u548c\u5757\u7406\u89e3\u4e3a\uff1a\u6247\u533a\u662f\u786c\u4ef6\u8bbe\u5907\u4f20\u8f93\u6570\u636e\u7684\u6700\u5c0f\u5355\u4f4d\uff0c\u800c\u5757\u662f\u64cd\u4f5c\u7cfb\u7edf\u4f20\u8f93\u6570\u636e\u7684\u6700\u5c0f\u5355\u4f4d\u3002\u4e00\u4e2a\u5757\u901a\u5e38\u5bf9\u5e94\u4e00\u4e2a\u6216\u591a\u4e2a\u76f8\u90bb\u7684\u6247\u533a\uff0c\u7531\u4e8e\u5185\u6838\u5c06\u5757\u4f5c\u4e3a\u5bf9\u6587\u4ef6\u7cfb\u7edf\u64cd\u4f5c\u7684\u6700\u5c0f\u5355\u4f4d\uff0c\u56e0\u6b64VFS\u5c06\u5176\u770b\u4f5c\u662f\u5355\u4e00\u7684\u6570\u636e\u5355\u5143\u3002<\/p>\n<p>\u5f53\u5185\u6838\u4ece\u78c1\u76d8\u8bfb\u5165\u6570\u636e\u540e\u6216\u8005\u5373\u5c06\u5199\u6570\u636e\u5230\u78c1\u76d8\u65f6\uff0c\u5b83\u9700\u8981\u5c06\u6570\u636e\u5199\u5165\u4e00\u4e2a\u7f13\u51b2\u533a\u3002\u7f13\u51b2\u533a\u5176\u5b9e\u5c31\u662f\u7269\u7406\u9875\u6846\u7684\u4e00\u90e8\u5206\uff0c\u56e0\u6b64\u4e00\u4e2a\u7269\u7406\u9875\u6846\u53ef\u80fd\u5305\u542b\u4e00\u4e2a\u6216\u591a\u4e2a\u5757\u7f13\u51b2\u533a\u3002\u6839\u636e\u4e0a\u8ff0\u63cf\u8ff0\u7684\u5173\u7cfb\uff0c\u5305\u542b\u78c1\u76d8\u6570\u636e\u7684\u7269\u7406\u9875\u6846\u6784\u9020\u5982\u4e0b\u56fe\uff1a<\/p>\n<p><a href=\"http:\/\/edsionte.com\/techblog\/archives\/4085\/buffer\" rel=\"attachment wp-att-4102\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-4102\" title=\"buffer\" src=\"http:\/\/edsionte.com\/techblog\/wordpress\/wp-content\/uploads\/2012\/07\/buffer.jpeg\" alt=\"\" width=\"271\" height=\"439\" srcset=\"http:\/\/edsionte.com\/techblog\/wordpress\/wp-content\/uploads\/2012\/07\/buffer.jpeg 271w, http:\/\/edsionte.com\/techblog\/wordpress\/wp-content\/uploads\/2012\/07\/buffer-185x300.jpeg 185w\" sizes=\"auto, (max-width: 271px) 100vw, 271px\" \/><\/a><\/p>\n<p>\u6b63\u5982\u4e0a\u9762\u6240\u8bf4\uff0c\u5757\u7f13\u51b2\u533a\u662f\u9875\u6846\u7684\u4e00\u90e8\u5206\uff0c\u56e0\u6b64\u4e0d\u7528\u7279\u522b\u63cf\u8ff0\u5757\u7f13\u51b2\u533a\u4e2d\u7684\u6570\u636e\u3002\u6bcf\u4e2a\u5757\u7f13\u51b2\u533a\u90fd\u5bf9\u5e94\u4e00\u4e2a\u5757\u7f13\u51b2\u533a\u5934buffer_head\uff0c\u4ed6\u4eec\u7684\u5173\u7cfb\u5982\u540c\u7269\u7406\u9875\u6846\u548c\u7269\u7406\u9875\u6846\u63cf\u8ff0\u7b26\uff0c\u524d\u8005\u7528\u6765\u5b58\u50a8\u6570\u636e\uff0c\u540e\u8005\u662f\u5bf9\u524d\u8005\u7684\u5c5e\u6027\u4ee5\u53ca\u63a7\u5236\u4fe1\u606f\u7684\u63cf\u8ff0\u3002\u5757\u7f13\u51b2\u533a\u5934\u3001\u5757\u7f13\u51b2\u533a\u4ee5\u53ca\u9875\u6846\u7684\u5173\u7cfb\u5982\u4e0b\uff1a<\/p>\n<p><a href=\"http:\/\/edsionte.com\/techblog\/archives\/4085\/buffer_head\" rel=\"attachment wp-att-4103\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-4103\" title=\"buffer_head\" src=\"http:\/\/edsionte.com\/techblog\/wordpress\/wp-content\/uploads\/2012\/07\/buffer_head.jpeg\" alt=\"\" width=\"469\" height=\"427\" srcset=\"http:\/\/edsionte.com\/techblog\/wordpress\/wp-content\/uploads\/2012\/07\/buffer_head.jpeg 469w, http:\/\/edsionte.com\/techblog\/wordpress\/wp-content\/uploads\/2012\/07\/buffer_head-300x273.jpeg 300w\" sizes=\"auto, (max-width: 469px) 100vw, 469px\" \/><\/a><br \/>\n\u5185\u6838\u4e2d\u4f7f\u7528buffer_head\u7ed3\u6784\u6765\u63cf\u8ff0\u7f13\u51b2\u533a\u5934\uff0c\u8be5\u7ed3\u6784\u4e2d\u7684\u90e8\u5206\u5b57\u6bb5\u89e3\u91ca\u5982\u4e0b\uff1a<\/p>\n<pre class=\"brush: cpp; title: ; notranslate\" title=\"\">\r\nstruct buffer_head {\r\n         unsigned long b_state;          \r\n         struct buffer_head *b_this_page;\r\n         struct page *b_page;            \r\n         atomic_t b_count;               \r\n         u32 b_size;                     \r\n         sector_t b_blocknr;             \r\n         char *b_data;                  \r\n         struct block_device *b_bdev;\r\n         bh_end_io_t *b_end_io;         \r\n         void *b_private;               \r\n         struct list_head b_assoc_buffers; \r\n<\/pre>\n<p>b_state\uff1a\u5bf9\u5757\u7f13\u51b2\u533a\u72b6\u6001\u7684\u63cf\u8ff0\u3002<br \/>\nb_this_page\uff1a\u5728\u4e00\u4e2a\u9875\u6846\u4e2d\uff0c\u53ef\u80fd\u5305\u542b\u591a\u4e2a\u5757\u7f13\u51b2\u533a\u3002\u4e00\u4e2a\u9875\u6846\u5185\u7684\u6240\u6709\u7f13\u51b2\u533a\u5f62\u6210\u5faa\u73af\u94fe\u8868\uff0c\u8be5\u5b57\u6bb5\u6307\u5411\u4e0b\u4e00\u4e2a\u5757\u7f13\u51b2\u533a\u3002<br \/>\nb_page\uff1a\u6307\u5411\u7f13\u51b2\u533a\u6240\u5728\u9875\u6846\u7684\u63cf\u8ff0\u7b26\u3002<br \/>\nb_size\uff1a\u5757\u7f13\u51b2\u533a\u5927\u5c0f\u3002<br \/>\nb_data\uff1a\u5f53\u524d\u5757\u5728\u4f5c\u4e3a\u7f13\u51b2\u7684\u9875\u6846\u5185\u7684\u4f4d\u7f6e\u3002<br \/>\nb_bdev\uff1a\u6307\u5411\u5757\u8bbe\u5907\u7684\u6307\u9488\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u8be6\u7ec6\u8bf4\u660e\u5757\u7f13\u51b2\u533a\u548c\u5757\u7f13\u51b2\u533a\u5934\u4e4b\u524d\uff0c\u6211\u4eec\u5148\u6765\u770b\u4e00\u4e0b\u5757\u8bbe\u5907\u4e2d\u7684\u4e24\u4e2a\u57fa\u672c\u6982\u5ff5\uff1a\u6247\u533a\u548c\u5757\u3002 \u6247\u533a\u662f\u5757\u8bbe\u5907\u4f20\u8f93\u6570\u636e\u7684\u57fa [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[110,175],"tags":[],"class_list":["post-4085","post","type-post","status-publish","format-standard","hentry","category-linux","category-175"],"views":8933,"_links":{"self":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/4085","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=4085"}],"version-history":[{"count":0,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/4085\/revisions"}],"wp:attachment":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/media?parent=4085"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/categories?post=4085"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/tags?post=4085"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}