centos man page for block_invalidatepage

BLOCK_INVALIDATEPAGE(9) 					   The Linux VFS					   BLOCK_INVALIDATEPAGE(9)

NAME
       block_invalidatepage - invalidate part or all of a buffer-backed page

SYNOPSIS
       void block_invalidatepage(struct page * page, unsigned long offset);

ARGUMENTS
       page
	   the page which is affected

       offset
	   the index of the truncation point

DESCRIPTION
       block_invalidatepage is called when all or part of the page has become invalidated by a truncate operation.

       block_invalidatepage does not have to release all buffers, but it must ensure that no dirty buffer is left outside offset and that no I/O
       is underway against any of the blocks which are outside the truncation point. Because the caller is about to free (and possibly reuse)
       those blocks on-disk.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   BLOCK_INVALIDATEPAGE(9)