TRUNCATE_PAGECACHE(9) Memory Management in Linux TRUNCATE_PAGECACHE(9)
NAME
truncate_pagecache - unmap and remove pagecache that has been truncated
SYNOPSIS
void truncate_pagecache(struct inode * inode, loff_t old, loff_t new);
ARGUMENTS
inode
inode
old
old file offset
new
new file offset
DESCRIPTION
inode's new i_size must already be written before truncate_pagecache is called.
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 2.6. July 2010 TRUNCATE_PAGECACHE(9)
