centos man page for truncate_pagecache_range

TRUNCATE_PAGECACHE_R(9) 				    Memory Management in Linux					   TRUNCATE_PAGECACHE_R(9)

NAME
       truncate_pagecache_range - unmap and remove pagecache that is hole-punched

SYNOPSIS
       void truncate_pagecache_range(struct inode * inode, loff_t lstart, loff_t lend);

ARGUMENTS
       inode
	   inode

       lstart
	   offset of beginning of hole

       lend
	   offset of last byte of hole

DESCRIPTION
       This function should typically be called before the filesystem releases resources associated with the freed range (eg. deallocates blocks).
       This way, pagecache will always stay logically coherent with on-disk format, and the filesystem would not have to deal with situations such
       as writepage being called for a page that has already had its underlying blocks deallocated.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   TRUNCATE_PAGECACHE_R(9)