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 newsize);

ARGUMENTS
       inode
           inode

       newsize
           new file size

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 4.8.                 January 2017                     TRUNCATE_PAGECACHE(9)