truncate_pagecache_range (9) - Linux Manuals
truncate_pagecache_range: unmap and remove pagecache that is hole-punched
truncate_pagecache_range - unmap and remove pagecache that is hole-punched
void truncate_pagecache_range(struct inode
* inode, loff_t lstart, loff_t lend);
- offset of beginning of hole
- offset of last byte of hole
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.