{"id":183926,"date":"2026-10-21T17:40:46","date_gmt":"2026-10-21T15:40:49","guid":{"rendered":"https:\/\/prohoster.info\/blog\/news\/dlya-yadra-linux-realizovany-novye-fajlovye-sistemy-beamfs-xmfs-i-meshxfs"},"modified":"2026-10-21T17:40:54","modified_gmt":"2026-10-21T15:40:54","slug":"new-beamfs-xmfs-and-meshxfs-file-systems-implemented-for-the-linux-kernel","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/new-beamfs-xmfs-and-meshxfs-file-systems-implemented-for-the-linux-kernel","title":{"rendered":"Pre jadro Linuxu boli implementovan\u00e9 nov\u00e9 s\u00faborov\u00e9 syst\u00e9my BeamFS, XMFS a MeshXFS","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Na zozname diskusie v\u00fdvoj\u00e1rov jadra Linux boli zverejnen\u00e9 z\u00e1platy na implement\u00e1ciu s\u00faborov\u00e9ho syst\u00e9mu BeamFS, ktor\u00fd vyu\u017e\u00edva Reed-Solomonovo k\u00f3dovanie na ur\u010denie a obnovenie po\u0161koden\u00fdch \u00fadajov na mieste v konfigur\u00e1ci\u00e1ch s jedn\u00fdm \u00falo\u017eiskom. Hlavn\u00fdmi oblas\u0165ami pou\u017eitia BeamFS s\u00fa palubn\u00e9 po\u010d\u00edta\u010de satelitov, zariadenia v kab\u00ednach r\u00e1dioterapie a \u010fal\u0161ie syst\u00e9my, ktor\u00e9 pracuj\u00fa v podmienkach zv\u00fd\u0161enej radi\u00e1cie, kde je navr\u00e1tenie skreslen\u00fdch \u00fadajov kritickej\u0161ie ne\u017e neschopnos\u0165 pre\u010d\u00edta\u0165 inform\u00e1cie.<\/p>\n

Predvolene m\u00f4\u017ee BeamFS obnovi\u0165 a\u017e 8 straten\u00fdch bajtov v ka\u017edom bloku s ve\u013ekos\u0165ou 255 bajtov s re\u017eijn\u00fdmi n\u00e1kladmi 7% (288 bajtov obnovovac\u00edch k\u00f3dov na ka\u017ed\u00fdch 4096 bajtov ulo\u017een\u00fdch \u00fadajov). K\u00f3dy na opravu ch\u00fdb s\u00fa aplikovan\u00e9 nielen na \u00fadaje, ale aj na syst\u00e9mov\u00e9 inform\u00e1cie v superblokoch, inode, indexoch adres\u00e1rov a bitov\u00fdch map\u00e1ch. Kontrola integrity a pokusy o obnovu ch\u00fdbaj\u00facich \u00fadajov sa vykon\u00e1vaj\u00fa pri ka\u017edej oper\u00e1cii \u010d\u00edtania. Ak sa nepodar\u00ed zaru\u010di\u0165 spr\u00e1vnos\u0165 inform\u00e1ci\u00ed, oper\u00e1cia sa ukon\u010d\u00ed chybou \"-EIO\", \u010do vylu\u010duje skryt\u00e9 vr\u00e1tenie po\u0161koden\u00fdch \u00fadajov. <\/p>\n

Pod\u013ea vykonan\u00fdch experimentov sa uk\u00e1zalo, \u017ee pri o\u017eiaren\u00ed dosky i.MX 8M Plus s Linuxom a s\u00faborov\u00fdm syst\u00e9mom ext4 prot\u00f3nmi s energiou od 20 do 58 MeV, 90 % v\u0161etk\u00fdch por\u00fach vzniklo na \u00farovni s\u00faborov\u00e9ho syst\u00e9mu a ovl\u00e1da\u010dov zariaden\u00ed na ukladanie. Taktie\u017e sa uskuto\u010dnila simul\u00e1cia jednotliv\u00fdch bitov\u00fdch skreslen\u00ed pri \u010d\u00edtan\u00ed z m\u00e9dia: BeamFS a Btrfs \u00faspe\u0161ne rozpoznali po\u0161kodenie \u00fadajov a v\u017edy vr\u00e1tili chybu, zatia\u013e \u010do ext4 a ext3 ticho vr\u00e1tili skreslen\u00e9 \u00fadaje.<\/p>\n

BeamFS zabezpe\u010duje integritu a obnovu len na f\u00e1ze od \u010d\u00edtania z fyzick\u00e9ho m\u00e9dia po prenos do str\u00e1nkov\u00e9ho cache v opera\u010dnej pam\u00e4ti. Integrita uchov\u00e1vania v opera\u010dnej pam\u00e4ti m\u00f4\u017ee by\u0165 zaisten\u00e1 pomocou pam\u00e4\u0165ov\u00fdch \u010dipov s opravou ch\u00fdb.
\nMedzi obmedzenia BeamFS patr\u00ed absencia podpory \u017eurn\u00e1lovania a re\u017eimu Copy-on-Write (CoW) \u2014 metadata sa na \u00falo\u017eisko zapisuj\u00fa neusporiadane, preto je v pr\u00edpade nespr\u00e1vneho ukon\u010denia potrebn\u00e1 \u00fapln\u00e1 kontrola pomocou fsck.<\/p>\n

Okrem BeamFS boli ned\u00e1vno pre jadro Linux navrhnut\u00e9 \u010fal\u0161ie dve s\u00faborov\u00e9 syst\u00e9my: <\/p>\n