602  * Return valid em if we find a file extent matching the requirement.
613 	struct extent_map *em;  in defrag_get_extent()  local
618 	em = btrfs_alloc_extent_map();  in defrag_get_extent()
619 	if (!em) {  in defrag_get_extent()
691 			em->start = start;  in defrag_get_extent()
692 			em->disk_bytenr = EXTENT_MAP_HOLE;  in defrag_get_extent()
693 			em->disk_num_bytes = 0;  in defrag_get_extent()
694 			em->ram_bytes = 0;  in defrag_get_extent()
695 			em->offset = 0;  in defrag_get_extent()
696 			em->len = key.offset - start;  in defrag_get_extent()
713 		/* Now this extent covers @start, convert it to em */  in defrag_get_extent()
714 		btrfs_extent_item_to_extent_map(inode, &path, fi, em);  in defrag_get_extent()
724 	return em;  in defrag_get_extent()
728 	btrfs_free_extent_map(em);  in defrag_get_extent()
733 	btrfs_free_extent_map(em);  in defrag_get_extent()
742 	struct extent_map *em;  in defrag_lookup_extent()  local
750 	em = btrfs_lookup_extent_mapping(em_tree, start, sectorsize);  in defrag_lookup_extent()
755 	 * tree to get the original em for defrag.  in defrag_lookup_extent()
762 	if (em && (em->flags & EXTENT_FLAG_MERGED)) {  in defrag_lookup_extent()
763 		btrfs_free_extent_map(em);  in defrag_lookup_extent()
764 		em = NULL;  in defrag_lookup_extent()
767 	if (!em) {  in defrag_lookup_extent()
774 		em = defrag_get_extent(BTRFS_I(inode), start, newer_than);  in defrag_lookup_extent()
778 		if (IS_ERR(em))  in defrag_lookup_extent()
782 	return em;  in defrag_lookup_extent()
786 				   const struct extent_map *em)  in get_extent_max_capacity()  argument
788 	if (btrfs_extent_map_is_compressed(em))  in get_extent_max_capacity()
793 static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em,  in defrag_check_next_extent()  argument
801 	if (em->start + em->len >= i_size_read(inode))  in defrag_check_next_extent()
810 	next = defrag_lookup_extent(inode, em->start + em->len, newer_than, locked);  in defrag_check_next_extent()
811 	/* No more em or hole */  in defrag_check_next_extent()
820 	if (next->len >= get_extent_max_capacity(fs_info, em))  in defrag_check_next_extent()
968 		struct extent_map *em;  in defrag_collect_targets()  local
974 		em = defrag_lookup_extent(&inode->vfs_inode, cur, newer_than, locked);  in defrag_collect_targets()
975 		if (!em)  in defrag_collect_targets()
984 		if (em->disk_bytenr == EXTENT_MAP_INLINE &&  in defrag_collect_targets()
985 		    em->len <= inode->root->fs_info->max_inline)  in defrag_collect_targets()
989 		if (em->disk_bytenr == EXTENT_MAP_HOLE ||  in defrag_collect_targets()
990 		    (em->flags & EXTENT_FLAG_PREALLOC))  in defrag_collect_targets()
994 		if (em->generation < newer_than)  in defrag_collect_targets()
997 		/* This em is under writeback, no need to defrag */  in defrag_collect_targets()
998 		if (em->generation == (u64)-1)  in defrag_collect_targets()
1005 		range_len = em->len - (cur - em->start);  in defrag_collect_targets()
1038 		if (em->len >= extent_thresh)  in defrag_collect_targets()
1045 		if (em->len >= get_extent_max_capacity(fs_info, em))  in defrag_collect_targets()
1054 		if (em->disk_bytenr == EXTENT_MAP_INLINE)  in defrag_collect_targets()
1057 		next_mergeable = defrag_check_next_extent(&inode->vfs_inode, em,  in defrag_collect_targets()
1076 		range_len = min(btrfs_extent_map_end(em), start + len) - cur;  in defrag_collect_targets()
1098 			btrfs_free_extent_map(em);  in defrag_collect_targets()
1107 		cur = btrfs_extent_map_end(em);  in defrag_collect_targets()
1108 		btrfs_free_extent_map(em);  in defrag_collect_targets()