TRUNCATE_PAGECACHE_R(9) Memory Management in Linux TRUNCATE_PAGECACHE_R(9)NAMEtruncate_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.
COPYRIGHTKernel Hackers Manual 2.6. November 2013 TRUNCATE_PAGECACHE_R(9)