Kde su i-uzly
Jaksik za boha neviem nikde najst kde sa nachadzaju inody. Napadlo mi ze by mohli byt v adresaroch, kedze adresar je len subor. Alebo su vsetky ulozene nejak centralne? Je to vobec deterministicke pre vsetky linuxove distribucie, alebo to ma kazda inak?
:-)
Ked vytvorim subor, jeho meno spolu s cislom inodu (nie inodom samotnym) sa zapise do aktualneho adresara. When a file is created, it is assigned both a name and an inode number, which is an integer that is unique within the filesystem. Both the file names and their corresponding inode numbers are stored as entries in the directory that appears to the user to contain the files. That is, the directory associates file names with inodes.
Co sa stane ked ho chcem otvorit? Z jeho mena mi OS zisti cislo inodu (viz. hore). Na zaciatku FS (za superblokom) sa nachadzaju cisla inodov+akesi pointre na skutocny fyzicky obsah (fyzicke umiestnenie suboru na HDD, File size, atributy atd.) inodu na disku . * The inode numbers and their corresponding inodes are held in inode tables, which are stored in strategic locations in a filesystem, including near its beginning.
Takze v obsahu inodu sa nachadza aj fyzicke umiestnenie tohto inodu na disku a ked zistim to, moze mi uz moj OS vydat pristup k pozadovanemu suboru (samozrejme po skontrolovani opravneni). This metadata (ten inode) includes (1) the size of the file (in bytes) and its physical location (i.e., the addresses of the blocks of storage containing the file's data on a HDD), (2) the file's owner and group, (3) the file's access permissions (i.e., which users are permitted to read, write and/or execute the file), (4) timestamps telling when the inode was created, last modified and last accessed and (5) a reference count telling how many hard links point to the inode.
Je to skutocne takto, alebo som si zas nieco nespravne domyslel?
*Ake velka je vsak oblast kde sa tie cisla+pointre nachadzaju? To zavisi od mnozstva suborov (adresar=subor). A kedze to dopredu neviem tak...
Space for inodes must be set aside when an operating system (or a new filesystem) is installed and that system does its initial structuring of the filesystem. Within any filesystem, the maximum number of inodes, and hence the maximum number of files, is set when the filesystem is created.
Nechce sa Ti napísať o nových informáciach, čo si sa dozvedel aj krátky článoček tunaky....?
:-)