{"id":160996,"date":"2026-02-14T11:12:34","date_gmt":"2026-02-14T09:12:34","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/dlya-yadra-linux-predlozhena-fajlovaya-sistema-dlmpfs"},"modified":"2026-02-14T11:12:34","modified_gmt":"2026-02-14T09:12:34","slug":"dlya-yadra-linux-predlozhena-fajlovaya-sistema-dlmpfs","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/dlya-yadra-linux-predlozhena-fajlovaya-sistema-dlmpfs","title":{"rendered":"Pre jadro Linux bola navrhnut\u00e1 s\u00faborov\u00fd syst\u00e9m DLMPFS","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"
Alexander Aring z firmy Red Hat, ktor\u00fd sa zaober\u00e1 v jadre Linux subsyst\u00e9mami IEEE 802.15.4, DLM a flock\/fcntl, predstavil na mailing listi v\u00fdvoj\u00e1rov jadra \u0161pecializovan\u00fd s\u00faborov\u00fd syst\u00e9m DLMPFS. Navrhovan\u00fd FS poskytuje vrstvu pre distribuovan\u00e9 zamykanie s\u00faborov, implementovan\u00fa na b\u00e1ze DLM (Distributed Lock Manager) a ramfs. Implement\u00e1cia DLMPFS je dostupn\u00e1 vo forme sady patchov pre jadro Linux 6.19. <\/p>\n
DLMPFS umo\u017e\u0148uje pracova\u0165 so spolo\u010dnou hierarchiou s\u00faborov pre viacer\u00e9 hostite\u013esk\u00e9 zariadenia, vytv\u00e1ra\u0165 a maza\u0165 s\u00fabory a adres\u00e1re, nastavi\u0165 alebo zru\u0161i\u0165 z\u00e1mky na s\u00fabory pomocou \u0161tandardn\u00fdch funkci\u00ed flock() a fcntl(). Pri tom DLMPFS neumo\u017e\u0148uje zapisova\u0165 a \u010d\u00edta\u0165 d\u00e1ta zo s\u00faborov, obmedzuj\u00fac sa iba na oper\u00e1cie so z\u00e1mkami. Obmedzen\u00edm je tie\u017e mo\u017enos\u0165 ur\u010di\u0165 stav z\u00e1mku iba so znalos\u0165ou plnej cesty k s\u00faboru, ktor\u00e9ho z\u00e1mok sa blokuje (DLM vy\u017eaduje n\u00e1zov zdroja na ur\u010denie z\u00e1mku). <\/p>\n
S pomocou DLMPFS je mo\u017en\u00e9 \u013eahko prisp\u00f4sobi\u0165 existuj\u00face aplik\u00e1cie, ktor\u00e9 s\u00fa viazan\u00e9 na nastavenie z\u00e1mkov cez API flock\/fcntl, na pou\u017e\u00edvanie distribuovan\u00fdch z\u00e1mkov pokr\u00fdvaj\u00facich nieko\u013eko hostite\u013esk\u00fdch zariaden\u00ed v klastri, bez potreby zapoji\u0165 \u0161pecializovan\u00e9 distribuovan\u00e9 FS na uchov\u00e1vanie d\u00e1t. <\/p>\n
DLMPFS sa l\u00ed\u0161i od u\u017e existuj\u00faceho podobn\u00e9ho FS DLMFS pou\u017eit\u00edm API flock\/fcntl namiesto API \u0161pecifick\u00e9ho pre FS OCFS2. V pl\u00e1ne je prida\u0165 do DLMPFS distribuovan\u00e9 z\u00e1mky, ktor\u00e9 s\u00fa uveden\u00e9 v \u0161pecifik\u00e1cii POSIX, a mo\u017enos\u0165 pripoji\u0165 r\u00f4zne backendy na integr\u00e1ciu nielen s DLM, ale aj s in\u00fdmi mana\u017e\u00e9rmi distribuovan\u00fdch z\u00e1mkov, ako je NFS lockd. <\/p>\n
Pr\u00edklad pou\u017eitia (na druhom uzle bude zablokovanie na s\u00fabori \/mnt\/lock odstr\u00e1nen\u00e9 po 20 sekund\u00e1ch): Uzol 1: mount -t dlmpfs -o clname=$CLUSTERNAME none \/mnt touch \/mnt\/lock flock \/mnt\/lock -c «echo ‘z\u00edskan\u00e9’; sleep 20; echo ‘uvo\u013enen\u00e9'» Uzol 2: mount -t dlmpfs -o clname=$CLUSTERNAME none \/mnt touch \/mnt\/lock flock \/mnt\/lock -c «echo ‘z\u00edskan\u00e9’; sleep 20; echo ‘uvo\u013enen\u00e9'» \n Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"