How do i map from file name to the device it resides on

hi
i need to find a way to map from a file name to the disk device it resides on( so i can do ioctl to that device ).
i know that stat(2) returns a dev_t value, but i don't know how to translate from that dev_t to the device name( e.g. /dev/dsk/c0d0... )
THANKS
Gabriel

thanks for the reply,
i'm using a similar mechnisem on linux - using getmntent(3) to find the longest prefix of the filename realpath(3).
i was actually looking for a mechnisem similar to the devname(2) syscall on the BSD os. with this call the kernel do all the work for you simply by mapping from dev_t( which the kernel stored in the indoe) to the device name by keeping a simple mapping table.
if this mechinsem doesn't exists i will have to (eventually) duplicate the kernel work(namei) and create my own mapping.
THX
gabriel

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