{"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\/cs\/blog\/news\/dlya-yadra-linux-predlozhena-fajlovaya-sistema-dlmpfs","title":{"rendered":"Pro j\u00e1dro Linux byla navr\u017eena souborov\u00fd syst\u00e9m DLMPFS","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"
Alexander Aring z firmy Red Hat, kter\u00fd se pod\u00edl\u00ed na subsyst\u00e9mech IEEE 802.15.4, DLM a flock\/fcntl v j\u00e1dru Linux, p\u0159edstavil na mailing listu pro v\u00fdvoj\u00e1\u0159e j\u00e1dra specializovan\u00fd souborov\u00fd syst\u00e9m DLMPFS. Navrhovan\u00fd FS poskytuje vrstvu pro distribuovan\u00e9 souborov\u00e9 z\u00e1mky, implementovanou na z\u00e1klad\u011b DLM (Distributed Lock Manager) a ramfs. Implementace DLMPFS je k dispozici ve form\u011b sady patch\u016f pro j\u00e1dro Linux 6.19. <\/p>\n
DLMPFS umo\u017e\u0148uje pracovat s hierarchi\u00ed soubor\u016f, kter\u00e1 je spole\u010dn\u00e1 pro v\u00edce hostitel\u016f, vytv\u00e1\u0159et a mazat soubory a adres\u00e1\u0159e, nastavovat nebo odstra\u0148ovat z\u00e1mky na soubory pomoc\u00ed standardn\u00edch funkc\u00ed flock() a fcntl(). P\u0159itom DLMPFS neumo\u017e\u0148uje zapisovat a \u010d\u00edst data z soubor\u016f, omezuj\u00edc se pouze na operace se z\u00e1mky. Dal\u0161\u00edm omezen\u00edm je mo\u017enost ur\u010dit stav z\u00e1mku pouze s znalost\u00ed \u00fapln\u00e9 cesty k blokovan\u00e9mu souboru (DLM vy\u017eaduje jm\u00e9no zdroje pro ur\u010den\u00ed z\u00e1mku). <\/p>\n
Pomoc\u00ed DLMPFS lze snadno p\u0159izp\u016fsobit st\u00e1vaj\u00edc\u00ed aplikace, kter\u00e9 jsou zalo\u017eeny na nastavov\u00e1n\u00ed z\u00e1mk\u016f prost\u0159ednictv\u00edm API flock\/fcntl, tak, aby vyu\u017e\u00edvaly distribuovan\u00e9 z\u00e1mky pokr\u00fdvaj\u00edc\u00ed v\u00edce hostitel\u016f v clusteru, ani\u017e by bylo nutn\u00e9 pou\u017e\u00edt specializovan\u00e9 distribuovan\u00e9 FS pro ukl\u00e1d\u00e1n\u00ed dat. <\/p>\n
DLMPFS se li\u0161\u00ed od ji\u017e existuj\u00edc\u00edho podobn\u00e9ho FS DLMFS pou\u017e\u00edv\u00e1n\u00edm API flock\/fcntl m\u00edsto API specifick\u00e9ho pro FS OCFS2. V pl\u00e1nech je p\u0159id\u00e1n\u00ed distribuovan\u00fdch z\u00e1mk\u016f, kter\u00e9 jsou uvedeny ve specifikaci POSIX, a mo\u017enost p\u0159ipojen\u00ed r\u016fzn\u00fdch backend\u016f pro integraci nejen s DLM, ale i s dal\u0161\u00edmi spr\u00e1vci distribuovan\u00fdch z\u00e1mk\u016f, jako je NFS lockd. <\/p>\n
P\u0159\u00edklad pou\u017eit\u00ed (na druh\u00e9m uzlu bude uzam\u010den\u00ed na souboru \/mnt\/lock zru\u0161eno za 20 sekund): Uzly 1: mount -t dlmpfs -o clname=$CLUSTERNAME none \/mnt touch \/mnt\/lock flock \/mnt\/lock -c «echo ‘z\u00edsk\u00e1no’; sleep 20; echo ‘uvoln\u011bno'» Uzly 2: mount -t dlmpfs -o clname=$CLUSTERNAME none \/mnt touch \/mnt\/lock flock \/mnt\/lock -c «echo ‘z\u00edsk\u00e1no’; sleep 20; echo ‘uvoln\u011bno'» \n Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"