kernel/cache/file_map.cpp

54 	off_t			offset;
72 			void			Invalidate(off_t offset, off_t size);
75 			status_t		Translate(off_t offset, size_t size,
88 			file_extent*	_FindExtent(off_t offset, uint32* _index);
92 			status_t		_Cache(off_t offset, off_t size);
93 			void			_InvalidateAfter(off_t offset);
157 FileMap::_FindExtent(off_t offset, uint32 *_index)
166 		if (extent->offset > offset) {
169 		} else if (extent->offset + extent->disk.length <= offset) {
238 	off_t offset = 0;
247 		offset = lastExtent->offset + lastExtent->disk.length;
252 			if (lastExtent->disk.offset + lastExtent->disk.length
253 					== vecs[i].offset
254 				|| (lastExtent->disk.offset == -1 && vecs[i].offset == -1)) {
257 				offset += vecs[i].length;
271 		extent->offset = offset;
274 		offset += extent->disk.length;
281 		TRACE("[%ld] extent offset %lld, disk offset %lld, length %lld\n",
282 			i, extent->offset, extent->disk.offset, extent->disk.length);
286 	lastOffset = offset;
292 FileMap::_InvalidateAfter(off_t offset)
295 	file_extent* extent = _FindExtent(offset, &index);
299 		if (extent->offset + extent->disk.length > offset) {
300 			extent->disk.length = offset - extent->offset;
313 FileMap::Invalidate(off_t offset, off_t size)
317 	// TODO: honour size, we currently always remove everything after "offset"
318 	if (offset == 0) {
323 	_InvalidateAfter(offset);
350 FileMap::_Cache(off_t offset, off_t size)
358 		mapEnd = lastExtent->offset + lastExtent->disk.length;
360 	off_t end = offset + size;
407 FileMap::Translate(off_t offset, size_t size, file_io_vec* vecs, size_t* _count,
410 	if (offset < 0)
418 	if (offset >= Size()) {
422 	if ((off_t)(offset + size) > fSize) {
425 			if ((off_t)(offset + size) >= alignedSize)
428 		size = fSize - offset;
434 	status_t status = _Cache(offset, size);
442 	file_extent* fileExtent = _FindExtent(offset, &index);
444 	offset -= fileExtent->offset;
445 	if (fileExtent->disk.offset != -1)
446 		vecs[0].offset = fileExtent->disk.offset + offset;
448 		vecs[0].offset = -1;
449 	vecs[0].length = fileExtent->disk.length - offset;
518 		kprintf("  [%" B_PRIu32 "] offset %" B_PRIdOFF ", disk offset %"
519 			B_PRIdOFF ", length %" B_PRIdOFF "\n", i, extent->offset,
520 			extent->disk.offset, extent->disk.length);
556 				mapSize += extent->offset + extent->disk.length;
642 file_map_invalidate(void* _map, off_t offset, off_t size)
648 	map->Invalidate(offset, size);
664 file_map_translate(void* _map, off_t offset, size_t size, file_io_vec* vecs,
667 	TRACE("file_map_translate(map %p, offset %lld, size %ld)\n",
668 		_map, offset, size);
674 	return map->Translate(offset, size, vecs, _count, align);