BMAP(9) The Linux VFS BMAP(9)
NAME bmap - find a block number in a file
SYNOPSIS sector_t bmap(struct inode * inode, sector_t block);
ARGUMENTS inode inode of file
block block to find
DESCRIPTION Returns the block number on the device holding the inode that is the disk block number for the block of the file requested. That is, asked for block 4 of inode 1 the function will return the disk block relative to the disk start that holds that block of the file.
COPYRIGHT Kernel Hackers Manual 2.6. January 2013 BMAP(9)