41 static int freader_get_folio(struct freader *r, loff_t file_off)  in freader_get_folio()  argument
44 	if (r->folio && file_off >= r->folio_off &&  in freader_get_folio()
45 	    file_off < r->folio_off + folio_size(r->folio))  in freader_get_folio()
51 	r->folio = filemap_get_folio(r->file->f_mapping, file_off >> PAGE_SHIFT);  in freader_get_folio()
66 const void *freader_fetch(struct freader *r, loff_t file_off, size_t sz)  in freader_fetch()  argument
76 	if (unlikely(file_off + sz < file_off)) {  in freader_fetch()
83 		if (file_off + sz > r->data_sz) {  in freader_fetch()
87 		return r->data + file_off;  in freader_fetch()
100 		ret = __kernel_read(r->file, r->buf, sz, &file_off);  in freader_fetch()
109 	r->err = freader_get_folio(r, file_off);  in freader_fetch()
118 	if (file_off + sz > r->folio_off + folio_sz) {  in freader_fetch()
119 		u64 part_sz = r->folio_off + folio_sz - file_off, off;  in freader_fetch()
121 		memcpy(r->buf, r->addr + file_off - r->folio_off, part_sz);  in freader_fetch()
139 	return r->addr + (file_off - r->folio_off);  in freader_fetch()