linux-master/mm/truncate.c

300  * @lend: offset to which to truncate (inclusive)
304  * if lstart or lend + 1 is not page aligned).
317  * truncate_inode_pages_range is able to handle cases where lend + 1 is not
321 				loff_t lstart, loff_t lend)
339 	 * Note that 'end' is exclusive while 'lend' is inclusive.
342 	if (lend == -1)
344 		 * lend == -1 indicates end-of-file so we have to set 'end'
350 		end = (lend + 1) >> PAGE_SHIFT;
366 	same_folio = (lstart >> PAGE_SHIFT) == (lend >> PAGE_SHIFT);
369 		same_folio = lend < folio_pos(folio) + folio_size(folio);
370 		if (!truncate_inode_partial_folio(folio, lstart, lend)) {
381 		folio = __filemap_get_folio(mapping, lend >> PAGE_SHIFT,
384 			if (!truncate_inode_partial_folio(folio, lstart, lend))
816  * @lend: offset of last byte of hole
825 void truncate_pagecache_range(struct inode *inode, loff_t lstart, loff_t lend)
829 	loff_t unmap_end = round_down(1 + lend, PAGE_SIZE) - 1;
835 	 * allows holelen 0 for all, and we allow lend -1 for end of file.
846 	truncate_inode_pages_range(mapping, lstart, lend);