centos man page for bmap

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 3.10					     June 2014								   BMAP(9)