truncate_pagecache_range — unmap and remove pagecache that is hole-punched
void truncate_pagecache_range ( | struct inode * inode, |
| loff_t lstart, | |
loff_t lend); |
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.