centos man page for truncate_setsize

TRUNCATE_SETSIZE(9)					    Memory Management in Linux					       TRUNCATE_SETSIZE(9)

NAME
       truncate_setsize - update inode and pagecache for a new file size

SYNOPSIS
       void truncate_setsize(struct inode * inode, loff_t newsize);

ARGUMENTS
       inode
	   inode

       newsize
	   new file size

DESCRIPTION
       truncate_setsize updates i_size and performs pagecache truncation (if necessary) to newsize. It will be typically be called from the
       filesystem's setattr function when ATTR_SIZE is passed in.

       Must be called with inode_mutex held and before all filesystem specific block truncation has been performed.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						       TRUNCATE_SETSIZE(9)