Matthew Wilcox z Oracle, zn\u00e1m\u00fd vytvo\u0159en\u00edm ovlada\u010de nvme (NVM Express) a mechanismu p\u0159\u00edm\u00e9ho p\u0159\u00edstupu k FS DAX, navrhl odstranit souborov\u00fd syst\u00e9m ReiserFS z j\u00e1dra Linuxu obdobn\u011b jako d\u0159\u00edve odstran\u011bn\u00e9 zastaral\u00e9 FS ext a xiafs, nebo zkr\u00e1tit k\u00f3d ReiserFS, p\u0159i\u010dem\u017e by z\u016fstala pouze podpora pro pr\u00e1ci v re\u017eimu jen pro \u010dten\u00ed. <\/p>\n
Motivem pro odstran\u011bn\u00ed byly dal\u0161\u00ed pot\u00ed\u017ee s modernizac\u00ed infrastruktury j\u00e1dra, kter\u00e9 vznikly t\u00edm, \u017ee v\u00fdvoj\u00e1\u0159i byli nuceni ponechat v j\u00e1dru zastaral\u00fd zpracovatel p\u0159\u00edznaku AOP_FLAG_CONT_EXPAND, proto\u017ee ReiserFS z\u016fst\u00e1v\u00e1 jedin\u00fdm FS, kter\u00fd tento p\u0159\u00edznak pou\u017e\u00edv\u00e1 ve funkci write_begin. Posledn\u00ed oprava v k\u00f3du ReiserFS je datov\u00e1na do roku 2019 a nen\u00ed jasn\u00e9, jak moc je tento FS v\u016fbec popt\u00e1v\u00e1n a zda se st\u00e1le pou\u017e\u00edv\u00e1. <\/p>\n
Jan K\u00e1ra ze spole\u010dnosti SUSE souhlasil, \u017ee ReiserFS se nach\u00e1z\u00ed na cest\u011b k zastar\u00e1n\u00ed, ale nen\u00ed jasn\u00e9, zda je ji\u017e dost star\u00e9 na to, aby mohlo b\u00fdt odstran\u011bno z j\u00e1dra. Podle Jana ReiserFS st\u00e1le nach\u00e1z\u00ed uplatn\u011bn\u00ed v openSUSE a SLES, ale u\u017eivatelsk\u00e1 z\u00e1kladna tohoto syst\u00e9mu soubor\u016f je zanedbateln\u00e1 a st\u00e1le se zmen\u0161uje. Pro podnikov\u00e9 u\u017eivatele byla podpora ReiserFS ve SUSE ukon\u010dena p\u0159ed 3-4 lety a modul s ReiserFS nen\u00ed ve v\u00fdchoz\u00edm nastaven\u00ed sou\u010d\u00e1st\u00ed bal\u00ed\u010dku j\u00e1dra. Jako mo\u017enost Jan navrhl za\u010d\u00edt zobrazovat upozorn\u011bn\u00ed na zastar\u00e1n\u00ed p\u0159i p\u0159ipojov\u00e1n\u00ed odd\u00edl\u016f ReiserFS a pova\u017eovat tento syst\u00e9m soubor\u016f za p\u0159ipraven\u00fd k odstran\u011bn\u00ed, pokud b\u011bhem jednoho nebo dvou let nikdo ned\u00e1 najevo z\u00e1jem o pokra\u010dov\u00e1n\u00ed v jeho pou\u017e\u00edv\u00e1n\u00ed. <\/p>\n
Do diskuse se zapojil Eduard \u0160i\u0161kin, kter\u00fd se star\u00e1 o souborov\u00fd syst\u00e9m ReiserFS, a poskytl patch, kter\u00fd odstra\u0148uje pou\u017eit\u00ed p\u0159\u00edznaku AOP_FLAG_CONT_EXPAND z k\u00f3du ReiserFS. Matthew Wilcox patch p\u0159ijal do sv\u00e9 v\u011btve. T\u00edmto byl odstran\u011bn d\u016fvod pro odstran\u011bn\u00ed a ot\u00e1zku vylou\u010den\u00ed ReiserFS z j\u00e1dra lze pova\u017eovat za odlo\u017eenou na dostate\u010dn\u011b dlouhou dobu. <\/p>\n
Ot\u00e1zku zastaralosti ReiserFS nelze zcela opomenout kv\u016fli prac\u00edm na vylou\u010den\u00ed souborov\u00fdch syst\u00e9m\u016f s nevy\u0159e\u0161en\u00fdm probl\u00e9mem roku 2038 z j\u00e1dra. Nap\u0159\u00edklad z tohoto d\u016fvodu byl ji\u017e p\u0159ipraven pl\u00e1n na odstran\u011bn\u00ed \u010dtvrt\u00e9 verze form\u00e1tu souborov\u00e9ho syst\u00e9mu XFS z j\u00e1dra (nov\u00fd form\u00e1t XFS byl navr\u017een v j\u00e1d\u0159e 5.10 a posunul p\u0159ete\u010den\u00ed \u010dasov\u00e9ho \u010d\u00edta\u010de do roku 2468). Sestaven\u00ed XFS v4 bude ve v\u00fdchoz\u00edm nastaven\u00ed vypnuto v roce 2025 a k\u00f3d bude odstran\u011bn v roce 2030. Podobn\u00fd pl\u00e1n se navrhuje vypracovat i pro ReiserFS, p\u0159i\u010dem\u017e se poskytne alespo\u0148 p\u011bt let na migraci na jin\u00e9 FS nebo zm\u011bn\u011bn\u00fd form\u00e1t metadat. \u041c\u044d\u0442\u044c\u044e \u0423\u0438\u043b\u043a\u043e\u043a\u0441 (Matthew Wilcox) \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Oracle, \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u044b\u0439 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u0435\u043c \u0434\u0440\u0430\u0439\u0432\u0435\u0440\u0430 nvme (NVM Express) \u0438 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u0430 \u043f\u0440\u044f\u043c\u043e\u0433\u043e \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043a \u0424\u0421 DAX, \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0438\u043b \u0443\u0434\u0430\u043b\u0438\u0442\u044c \u0444\u0430\u0439\u043b\u043e\u0432\u0443\u044e \u0441\u0438\u0441\u0442\u0435\u043c\u0443 ReiserFS \u0438\u0437 \u0441\u043e\u0441\u0442\u0430\u0432\u0430 \u044f\u0434\u0440\u0430 Linux \u043f\u043e \u0430\u043d\u0430\u043b\u043e\u0433\u0438\u0438 \u0441 \u043a\u043e\u0433\u0434\u0430-\u0442\u043e \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u044b\u043c\u0438 \u0443\u0441\u0442\u0430\u0440\u0435\u0432\u0448\u0438\u043c\u0438 \u0424\u0421 ext \u0438 xiafs \u0438\u043b\u0438 \u0441\u043e\u043a\u0440\u0430\u0442\u0438\u0442\u044c \u043a\u043e\u0434 ReiserFS, \u043e\u0441\u0442\u0430\u0432\u0438\u0432 \u0442\u043e\u043b\u044c\u043a\u043e \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0443 \u0440\u0430\u0431\u043e\u0442\u044b \u0432 \u0440\u0435\u0436\u0438\u043c\u0435 \u0442\u043e\u043b\u044c\u043a\u043e \u0434\u043b\u044f \u0447\u0442\u0435\u043d\u0438\u044f. \u041c\u043e\u0442\u0438\u0432\u043e\u043c \u0434\u043b\u044f \u0443\u0434\u0430\u043b\u0435\u043d\u0438\u044f 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Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"