{"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\/cs\/blog\/news\/new-beamfs-xmfs-and-meshxfs-file-systems-implemented-for-the-linux-kernel","title":{"rendered":"Pro j\u00e1dro Linux byly implementov\u00e1ny nov\u00e9 souborov\u00e9 syst\u00e9my BeamFS, XMFS a MeshXFS","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Pro diskuzi na mailing list\u011b v\u00fdvoj\u00e1\u0159\u016f j\u00e1dra Linux byly zve\u0159ejn\u011bny patche implementuj\u00edc\u00ed souborov\u00fd syst\u00e9m BeamFS, kter\u00fd vyu\u017e\u00edv\u00e1 Reed-Solomonovo k\u00f3dov\u00e1n\u00ed k identifikaci a obnoven\u00ed po\u0161kozen\u00fdch dat na m\u00edst\u011b v konfigurac\u00edch s jedn\u00edm \u00falo\u017ei\u0161t\u011bm. Mezi hlavn\u00ed oblasti pou\u017eit\u00ed BeamFS pat\u0159\u00ed palubn\u00ed po\u010d\u00edta\u010de satelit\u016f, za\u0159\u00edzen\u00ed v kabin\u00e1ch r\u00e1dioterapie a dal\u0161\u00ed syst\u00e9my, kter\u00e9 pracuj\u00ed v podm\u00ednk\u00e1ch zv\u00fd\u0161en\u00e9 radiace, pro kter\u00e9 je n\u00e1vrat po\u0161kozen\u00fdch dat d\u016fle\u017eit\u011bj\u0161\u00ed ne\u017e nemo\u017enost p\u0159e\u010d\u00edst informace.<\/p>\n

Ve v\u00fdchoz\u00edm nastaven\u00ed m\u016f\u017ee BeamFS obnovit a\u017e 8 ztracen\u00fdch byt\u016f v ka\u017ed\u00e9m 255-bajtov\u00e9m bloku s re\u017eijn\u00edmi n\u00e1klady 7% (288 byt\u016f obnovovac\u00edch k\u00f3d\u016f na ka\u017ed\u00fdch 4096 byt\u016f ulo\u017een\u00fdch dat). K\u00f3dy pro opravu chyb se aplikuj\u00ed nejen na data, ale tak\u00e9 na ovl\u00e1dac\u00ed informace v superbloku, inode, indexech adres\u00e1\u0159\u016f a bitmap\u00e1ch. Kontrola integrity a pokusy o obnovu chyb\u011bj\u00edc\u00edch dat se prov\u00e1d\u011bj\u00ed p\u0159i ka\u017ed\u00e9 operaci \u010dten\u00ed. Pokud se nepoda\u0159\u00ed zajistit spr\u00e1vnost informac\u00ed, operace kon\u010d\u00ed chybou \u201e-EIO\u201c, co\u017e vylu\u010duje skryt\u00e9 vracen\u00ed po\u0161kozen\u00fdch dat. <\/p>\n

Experimenty uk\u00e1zaly, \u017ee p\u0159i oz\u00e1\u0159en\u00ed desky i.MX 8M Plus s Linuxem a FS ext4 protony s energi\u00ed od 20 do 58 MeV vznikalo 90 % v\u0161ech selh\u00e1n\u00ed na \u00farovni souborov\u00e9ho syst\u00e9mu a ovlada\u010d\u016f \u00falo\u017en\u00fdch za\u0159\u00edzen\u00ed. Byla tak\u00e9 provedena simulace jednotliv\u00fdch poruch bit\u016f p\u0159i \u010dten\u00ed z nosi\u010de: BeamFS a Btrfs \u00fasp\u011b\u0161n\u011b rozpoznaly po\u0161kozen\u00ed dat a v\u017edy vracely chybu, zat\u00edmco ext4 a ext3 ti\u0161e vracely po\u0161kozen\u00e1 data.<\/p>\n

BeamFS zaji\u0161\u0165uje integritu a obnovu pouze na \u00farovni od \u010dten\u00ed z fyzick\u00e9ho nosi\u010de do p\u0159ed\u00e1n\u00ed do str\u00e1nkov\u00e9ho mezipam\u011bti v opera\u010dn\u00ed pam\u011bti. Integrita dat v opera\u010dn\u00ed pam\u011bti m\u016f\u017ee b\u00fdt udr\u017eov\u00e1na pomoc\u00ed pam\u011b\u0165ov\u00fdch \u010dip\u016f s opravou chyb.
\nMezi omezen\u00edmi BeamFS se uv\u00e1d\u00ed absence podpory \u017eurn\u00e1lov\u00e1n\u00ed a re\u017eimu Copy-on-Write (CoW) \u2014 metadata na \u00falo\u017ei\u0161ti jsou zapisov\u00e1na neuspo\u0159\u00e1dan\u011b, a proto v p\u0159\u00edpad\u011b nespr\u00e1vn\u00e9ho ukon\u010den\u00ed pr\u00e1ce je nutn\u00e1 \u00fapln\u00e1 kontrola pomoc\u00ed fsck.<\/p>\n

Krom\u011b BeamFS byly pro j\u00e1dro Linux ned\u00e1vno navr\u017eeny dal\u0161\u00ed dv\u011b souborov\u00e9 syst\u00e9my: <\/p>\n