Kent Overstreet, autor jadra syst\u00e9mu kask\u00e1dov\u00e9ho ukladania blokov\u00fdch zariaden\u00ed na SSD-\u0165a\u017ebe BCache, na svojej prezent\u00e1cii na konferencii LSFMM 2023 (Linux Storage, Filesystem, Memory Management & BPF Summit) zhrnul v\u00fdsledky pr\u00e1ce na posune s\u00faborov\u00e9ho syst\u00e9mu Bcachefs do hlavn\u00e9ho jadra Linuxu a rozpovedal o pl\u00e1noch \u010fal\u0161ieho rozvoja tohto FS. V m\u00e1ji boli na recenzovanie a zaradenie do hlavn\u00e9ho jadra Linuxu navrhnut\u00e9 aktualizovan\u00e9 s\u00fapravy z\u00e1plat s implement\u00e1ciou FS Bcachefs. FS Bcachefs sa vyv\u00edja u\u017e pribli\u017ene 10 rokov. O pripravenosti na recenzovanie implement\u00e1cie Bcachefs pred jej zaraden\u00edm do jadra sa ozn\u00e1milo u\u017e koncom roka 2020 a v s\u00fa\u010dasnej variante z\u00e1plat s\u00fa zahrnut\u00e9 pozn\u00e1mky a nedostatky z predch\u00e1dzaj\u00facej recenzie. <\/p>\n
Cie\u013eom v\u00fdvoja Bcachefs je dosiahnu\u0165 \u00farove\u0148 XFS v oblasti v\u00fdkonu, spo\u013eahlivosti a \u0161k\u00e1lovate\u013enosti, pri\u010dom poskytuje \u010fal\u0161ie funkcie typick\u00e9 pre Btrfs a ZFS, ako je zaradenie viacer\u00fdch zariaden\u00ed do jedn\u00e9ho oddielu, viacvrstvov\u00e9 usporiadanie \u00falo\u017en\u00fdch m\u00e9di\u00ed, replik\u00e1cia (RAID 1\/10), caching, transparentn\u00e9 kompresie d\u00e1t (re\u017eimy LZ4, gzip a ZSTD), sn\u00edmky stavu (snapshoty), overenie integrity kontroln\u00fdmi s\u00fa\u010dtami, mo\u017enos\u0165 uchovania Reed-Solomonov\u00fdch k\u00f3dov pre opravy ch\u00fdb (RAID 5\/6), uchov\u00e1vanie inform\u00e1ci\u00ed v za\u0161ifrovanej forme (pou\u017e\u00edvaj\u00fa sa ChaCha20 a Poly1305). Z h\u013eadiska v\u00fdkonu Bcachefs predbehol Btrfs a in\u00e9 FS zalo\u017een\u00e9 na mechanizme Copy-on-Write a vykazuje r\u00fdchlos\u0165 bl\u00edzku Ext4 a XFS. <\/p>\n
Medzi posledn\u00fdmi \u00faspechmi v rozvoji Bcachefs sa uv\u00e1dza stabiliz\u00e1cia implement\u00e1cie snapshotov, ktor\u00e9 s\u00fa dostupn\u00e9 na z\u00e1pis. V porovnan\u00ed s Btrfs teraz snapshoty v Bcachefs ove\u013ea lep\u0161ie \u0161k\u00e1luj\u00fa a s\u00fa zbaven\u00e9 probl\u00e9mov, ktor\u00e9 s\u00fa vlastn\u00e9 Btrfs. V praxi bola funk\u010dnos\u0165 snapshotov vysk\u00fa\u0161an\u00e1 pri organiz\u00e1cii z\u00e1lohovania MySQL. V Bcachefs bola tie\u017e vykonan\u00e1 rozsiahla pr\u00e1ca na zlep\u0161en\u00ed \u0161k\u00e1lovate\u013enosti \u2014 s\u00faborov\u00fd syst\u00e9m sa osved\u010dil pri testovan\u00ed v \u00falo\u017eisk\u00e1ch s ve\u013ekos\u0165ou 100 TB a \u010doskoro sa o\u010dak\u00e1va zavedenie Bcachefs do \u00falo\u017eiska s ve\u013ekos\u0165ou 1 PB. Bol pridan\u00fd nov\u00fd re\u017eim nocow na vypnutie mechanizmu \u201ecopy-on-write\u201c (nocow). Po\u010das leta pl\u00e1nuj\u00fa stabilizova\u0165 implement\u00e1ciu k\u00f3dov na opravu ch\u00fdb a RAIDZ, ako aj vyrie\u0161i\u0165 probl\u00e9my s vysokou spotrebou pam\u00e4te pri obnove a kontrole FS utility fsck. <\/p>\n
Medzi pl\u00e1ny do bud\u00facnosti patr\u00ed \u017eelanie vyu\u017ei\u0165 pri v\u00fdvoji Bcachefs jazyk Rust. Pod\u013ea autora Bcachefs, m\u00e1 r\u00e1d programovanie a nie ladenie k\u00f3du, a teraz mu pr\u00edde absurdn\u00e9 p\u00edsa\u0165 k\u00f3d v jazyku C, ke\u010f existuje lep\u0161ia alternat\u00edva. Rust u\u017e je implementovan\u00fd v Bcachefs pri realiz\u00e1cii niektor\u00fdch n\u00e1strojov be\u017eiacich v u\u017e\u00edvate\u013eskom priestore. Navy\u0161e sa zva\u017euje my\u0161lienka postupne \u00faplne prepisova\u0165 Bcachefs na Rust, preto\u017ee pou\u017eitie tohto jazyka v\u00fdznamne \u0161etr\u00ed \u010das na ladenie. <\/p>\n
Pokia\u013e ide o presadenie Bcachefs do hlavnej l\u00ednie jadra Linux, tento proces prij\u00edmania sa m\u00f4\u017ee zdr\u017eova\u0165 kv\u00f4li v\u00fdznamnej ve\u013ekosti zmien (2500 patchov a pribli\u017ene 90 tis\u00edc riadkov k\u00f3du), ktor\u00e9 je \u0165a\u017ek\u00e9 recenzova\u0165. Pre ur\u00fdchlenie recenzovania niektor\u00ed v\u00fdvoj\u00e1ri navrhli rozdeli\u0165 s\u00e9riu patchov na men\u0161ie a logicky odl\u00ed\u0161en\u00e9 \u010dasti. Po\u010das diskusie, niektor\u00ed \u00fa\u010dastn\u00edci tie\u017e upozornili na to, \u017ee projekt rozv\u00edja len jeden v\u00fdvoj\u00e1r a obavy z toho, \u017ee k\u00f3d m\u00f4\u017ee zost\u00e1va\u0165 bez podpory, ak sa nie\u010do stane s jeho v\u00fdvoj\u00e1rom (o projekt sa zauj\u00edmaj\u00fa dvaja zamestnanci Red Hat, ale ich pr\u00e1ca je zatia\u013e obmedzen\u00e1 na opravu ch\u00fdb). <\/p>\n
Bcachefs sa vyv\u00edja s vyu\u017eit\u00edm technol\u00f3gi\u00ed, ktor\u00e9 u\u017e boli vysk\u00fa\u0161an\u00e9 pri v\u00fdvoji blokov\u00e9ho zariadenia Bcache, ur\u010den\u00e9ho na caching pr\u00edstupu k pomal\u00fdm pevn\u00fdm diskom na r\u00fdchlych SSD \u00falo\u017eisk\u00e1ch (s\u00fa\u010das\u0165 jadra od verzie 3.10). V Bcachefs sa pou\u017e\u00edva mechanizmus Copy-on-Write (COW), pri ktorom zmeny neved\u00fa k prepisovaniu \u00fadajov \u2014 nov\u00fd stav je zap\u00edsan\u00fd na nov\u00e9 miesto, po \u010dom sa zmen\u00ed ukazovate\u013e aktu\u00e1lneho stavu. <\/p>\n
\u0160peci\u00e1lnos\u0165ou Bcachefs je podpora viacvrstvov\u00e9ho pripojenia \u00falo\u017e\u00edsk, pri ktorom je \u00falo\u017eisko zostaven\u00e9 z viacer\u00fdch vrstiev \u2014 k dolnej vrstve s\u00fa pripojen\u00e9 najr\u00fdchlej\u0161ie \u00falo\u017eisk\u00e1 (SSD), ktor\u00e9 sa pou\u017e\u00edvaj\u00fa na caching \u010dasto pou\u017e\u00edvan\u00fdch d\u00e1t, zatia\u013e \u010do horn\u00e1 vrstva pozost\u00e1va z objemnej\u0161\u00edch a lacnej\u0161\u00edch diskov, ktor\u00e9 zabezpe\u010duj\u00fa ukladanie menej po\u017eadovan\u00fdch d\u00e1t. Medzi vrstvami m\u00f4\u017ee by\u0165 aplikovan\u00e9 caching v re\u017eime oneskorenej z\u00e1pisy (writeback). \u00dalo\u017eisk\u00e1 je mo\u017en\u00e9 dynamicky prid\u00e1va\u0165 a odpojova\u0165 od oddielu bez zastavenia pou\u017e\u00edvania s\u00faborov\u00e9ho syst\u00e9mu (d\u00e1ta sa automaticky migruj\u00fa). \u041a\u0435\u043d\u0442 \u041e\u0432\u0435\u0440\u0441\u0442\u0440\u0438\u0442 (Kent Overstreet), \u0430\u0432\u0442\u043e\u0440 \u0432\u0445\u043e\u0434\u044f\u0449\u0435\u0439 \u0432 \u0441\u043e\u0441\u0442\u0430\u0432 \u044f\u0434\u0440\u0430 Linux \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u043a\u044d\u0448\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0431\u043b\u043e\u0447\u043d\u044b\u0445 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432 \u043d\u0430 SSD-\u043d\u0430\u043a\u043e\u043f\u0438\u0442\u0435\u043b\u044f\u0445 BCache, \u0432 \u0441\u0432\u043e\u0451\u043c \u0432\u044b\u0441\u0442\u0443\u043f\u043b\u0435\u043d\u0438\u0438 \u043d\u0430 \u043a\u043e\u043d\u0444\u0435\u0440\u0435\u043d\u0446\u0438\u0438 LSFMM 2023 (Linux Storage, Filesystem, Memory Management & BPF Summit) \u043e\u0431\u043e\u0431\u0449\u0438\u043b \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u044b \u0440\u0430\u0431\u043e\u0442\u044b \u043f\u043e \u043f\u0440\u043e\u0434\u0432\u0438\u0436\u0435\u043d\u0438\u044e \u0444\u0430\u0439\u043b\u043e\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b Bcachefs \u0432 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439 \u0441\u043e\u0441\u0442\u0430\u0432 \u044f\u0434\u0440\u0430 Linux \u0438 \u0440\u0430\u0441\u0441\u043a\u0430\u0437\u0430\u043b \u043e \u043f\u043b\u0430\u043d\u0430\u0445 \u043f\u043e \u0434\u0430\u043b\u044c\u043d\u0435\u0439\u0448\u0435\u043c\u0443 \u0440\u0430\u0437\u0432\u0438\u0442\u0438\u044e \u0434\u0430\u043d\u043d\u043e\u0439 \u0424\u0421. \u0412 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-109017","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Podpora Bcachefs v jadre Linux | ProHoster","description":"Kent Overstreet, autor s\u00fa\u010dasti jadra Linux syst\u00e9mu vyrovn\u00e1vania blokov\u00fdch zariaden\u00ed na SSD \u00falo\u017eisk\u00e1ch BCache, vo svojom vyst\u00fapen\u00ed na konferencii LSFMM 2023 (Linux Storage, Filesystem, Memory).","canonical_url":"https:\/\/prohoster.info\/sk\/blog\/news\/prodvizhenie-bcachefs-v-sostav-yadra-linux","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"sk_SK","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u041f\u0440\u043e\u0434\u0432\u0438\u0436\u0435\u043d\u0438\u0435 Bcachefs \u0432 \u0441\u043e\u0441\u0442\u0430\u0432 \u044f\u0434\u0440\u0430 Linux | ProHoster","og:description":"\u041a\u0435\u043d\u0442 \u041e\u0432\u0435\u0440\u0441\u0442\u0440\u0438\u0442 (Kent Overstreet), \u0430\u0432\u0442\u043e\u0440 \u0432\u0445\u043e\u0434\u044f\u0449\u0435\u0439 \u0432 \u0441\u043e\u0441\u0442\u0430\u0432 \u044f\u0434\u0440\u0430 Linux \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u043a\u044d\u0448\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0431\u043b\u043e\u0447\u043d\u044b\u0445 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432 \u043d\u0430 SSD-\u043d\u0430\u043a\u043e\u043f\u0438\u0442\u0435\u043b\u044f\u0445 BCache, \u0432 \u0441\u0432\u043e\u0451\u043c \u0432\u044b\u0441\u0442\u0443\u043f\u043b\u0435\u043d\u0438\u0438 \u043d\u0430 \u043a\u043e\u043d\u0444\u0435\u0440\u0435\u043d\u0446\u0438\u0438 LSFMM 2023 (Linux Storage, Filesystem, 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Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"