fs/erofs/zmap.c

12 	struct erofs_map_blocks *map;
36 	m->kaddr = erofs_read_metabuf(&m->map->buf, inode->i_sb,
269 	m->kaddr = erofs_read_metabuf(&m->map->buf, inode->i_sb,
314 			m->map->m_la = (lcn << lclusterbits) | m->clusterofs;
335 	struct erofs_map_blocks *const map = m->map;
350 		map->m_plen = 1ULL << lclusterbits;
395 	map->m_plen = erofs_pos(sb, m->compressedblks);
407 	struct erofs_map_blocks *map = m->map;
409 	u64 lcn = m->lcn, headlcn = map->m_la >> lclusterbits;
415 			map->m_llen = inode->i_size - map->m_la;
442 	map->m_llen = (lcn << lclusterbits) + m->clusterofs - map->m_la;
447 				 struct erofs_map_blocks *map, int flags)
454 		.map = map,
462 	ofs = flags & EROFS_GET_BLOCKS_FINDTAIL ? inode->i_size - 1 : map->m_la;
473 	map->m_flags = EROFS_MAP_MAPPED | EROFS_MAP_ENCODED;
482 			map->m_la = (m.lcn << lclusterbits) | m.clusterofs;
501 		map->m_flags |= EROFS_MAP_FULL_MAPPED;
518 		map->m_flags |= EROFS_MAP_PARTIAL_REF;
519 	map->m_llen = end - map->m_la;
528 		map->m_flags |= EROFS_MAP_META;
529 		map->m_pa = vi->z_idataoff;
530 		map->m_plen = vi->z_idata_size;
532 		map->m_flags |= EROFS_MAP_FRAGMENT;
534 		map->m_pa = erofs_pos(inode->i_sb, m.pblk);
541 		if (map->m_llen > map->m_plen) {
559 	map->m_algorithmformat = afmt;
563 	     (map->m_algorithmformat == Z_EROFS_COMPRESSION_LZMA ||
564 	      map->m_algorithmformat == Z_EROFS_COMPRESSION_DEFLATE) &&
565 	      map->m_llen >= i_blocksize(inode))) {
568 			map->m_flags |= EROFS_MAP_FULL_MAPPED;
572 	erofs_unmap_metabuf(&m.map->buf);
611 	 * if the highest bit of the 8-byte map header is set, the whole file
652 		struct erofs_map_blocks map = {
657 		err = z_erofs_do_map_blocks(inode, &map,
659 		erofs_put_metabuf(&map.buf);
661 		if (!map.m_plen ||
662 		    erofs_blkoff(sb, map.m_pa) + map.m_plen > sb->s_blocksize) {
664 				  map.m_plen);
673 		struct erofs_map_blocks map = {
678 		err = z_erofs_do_map_blocks(inode, &map,
680 		erofs_put_metabuf(&map.buf);
695 int z_erofs_map_blocks_iter(struct inode *inode, struct erofs_map_blocks *map,
701 	trace_z_erofs_map_blocks_iter_enter(inode, map, flags);
704 	if (map->m_la >= inode->i_size) {
705 		map->m_llen = map->m_la + 1 - inode->i_size;
706 		map->m_la = inode->i_size;
707 		map->m_flags = 0;
717 		map->m_la = 0;
718 		map->m_llen = inode->i_size;
719 		map->m_flags = EROFS_MAP_MAPPED | EROFS_MAP_FULL_MAPPED |
724 	err = z_erofs_do_map_blocks(inode, map, flags);
726 	trace_z_erofs_map_blocks_iter_exit(inode, map, flags, err);
735 	struct erofs_map_blocks map = { .m_la = offset };
737 	ret = z_erofs_map_blocks_iter(inode, &map, EROFS_GET_BLOCKS_FIEMAP);
738 	erofs_put_metabuf(&map.buf);
743 	iomap->offset = map.m_la;
744 	iomap->length = map.m_llen;
745 	if (map.m_flags & EROFS_MAP_MAPPED) {
747 		iomap->addr = map.m_flags & EROFS_MAP_FRAGMENT ?
748 			      IOMAP_NULL_ADDR : map.m_pa;
758 		 * (map.m_la) from the requested offset, and add it to length.
759 		 * (NB: offset >= map.m_la always)
762 			iomap->length = length + offset - map.m_la;