2475 	struct extent_map *em;  in find_first_non_hole()  local
2478 	em = btrfs_get_extent(inode, NULL, 0,  in find_first_non_hole()
2481 	if (IS_ERR(em))  in find_first_non_hole()
2482 		return PTR_ERR(em);  in find_first_non_hole()
2485 	if (em->block_start == EXTENT_MAP_HOLE) {  in find_first_non_hole()
2487 		*len = em->start + em->len > *start + *len ?  in find_first_non_hole()
2488 		       0 : *start + *len - em->start - em->len;  in find_first_non_hole()
2489 		*start = em->start + em->len;  in find_first_non_hole()
2491 	free_extent_map(em);  in find_first_non_hole()
3135 	struct extent_map *em;  in btrfs_zero_range_check_range_boundary()  local
3139 	em = btrfs_get_extent(inode, NULL, 0, offset, sectorsize);  in btrfs_zero_range_check_range_boundary()
3140 	if (IS_ERR(em))  in btrfs_zero_range_check_range_boundary()
3141 		return PTR_ERR(em);  in btrfs_zero_range_check_range_boundary()
3143 	if (em->block_start == EXTENT_MAP_HOLE)  in btrfs_zero_range_check_range_boundary()
3145 	else if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags))  in btrfs_zero_range_check_range_boundary()
3150 	free_extent_map(em);  in btrfs_zero_range_check_range_boundary()
3160 	struct extent_map *em;  in btrfs_zero_range()  local
3170 	em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, alloc_start,  in btrfs_zero_range()
3172 	if (IS_ERR(em)) {  in btrfs_zero_range()
3173 		ret = PTR_ERR(em);  in btrfs_zero_range()
3185 	if (em->start <= alloc_start &&  in btrfs_zero_range()
3186 	    test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) {  in btrfs_zero_range()
3187 		const u64 em_end = em->start + em->len;  in btrfs_zero_range()
3195 			free_extent_map(em);  in btrfs_zero_range()
3208 		alloc_hint = em->block_start + em->len;  in btrfs_zero_range()
3210 	free_extent_map(em);  in btrfs_zero_range()
3214 		em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, alloc_start,  in btrfs_zero_range()
3216 		if (IS_ERR(em)) {  in btrfs_zero_range()
3217 			ret = PTR_ERR(em);  in btrfs_zero_range()
3221 		if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) {  in btrfs_zero_range()
3222 			free_extent_map(em);  in btrfs_zero_range()
3227 		if (len < sectorsize && em->block_start != EXTENT_MAP_HOLE) {  in btrfs_zero_range()
3228 			free_extent_map(em);  in btrfs_zero_range()
3237 		free_extent_map(em);  in btrfs_zero_range()
3349 	struct extent_map *em;  in btrfs_fallocate()  local
3432 		em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, cur_offset,  in btrfs_fallocate()
3434 		if (IS_ERR(em)) {  in btrfs_fallocate()
3435 			ret = PTR_ERR(em);  in btrfs_fallocate()
3438 		last_byte = min(extent_map_end(em), alloc_end);  in btrfs_fallocate()
3439 		actual_end = min_t(u64, extent_map_end(em), offset + len);  in btrfs_fallocate()
3441 		if (em->block_start == EXTENT_MAP_HOLE ||  in btrfs_fallocate()
3443 		     !test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) {  in btrfs_fallocate()
3448 				free_extent_map(em);  in btrfs_fallocate()
3454 				free_extent_map(em);  in btrfs_fallocate()
3460 		free_extent_map(em);  in btrfs_fallocate()
3533 	struct extent_map *em;  in find_delalloc_subrange()  local
3567 	em = lookup_extent_mapping(em_tree, start, len);  in find_delalloc_subrange()
3571 	em_end = em ? extent_map_end(em) : 0;  in find_delalloc_subrange()
3577 	if (em && (em->block_start == EXTENT_MAP_HOLE ||  in find_delalloc_subrange()
3578 		   test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) && em_end < end) {  in find_delalloc_subrange()
3585 		free_extent_map(em);  in find_delalloc_subrange()
3587 		em = next_em;  in find_delalloc_subrange()
3590 	if (em && (em->block_start == EXTENT_MAP_HOLE ||  in find_delalloc_subrange()
3591 		   test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) {  in find_delalloc_subrange()
3592 		free_extent_map(em);  in find_delalloc_subrange()
3593 		em = NULL;  in find_delalloc_subrange()
3600 	if (!em)  in find_delalloc_subrange()
3608 		*delalloc_start_ret = em->start;  in find_delalloc_subrange()
3610 		free_extent_map(em);  in find_delalloc_subrange()
3618 	if (em->start < *delalloc_start_ret) {  in find_delalloc_subrange()
3619 		*delalloc_start_ret = em->start;  in find_delalloc_subrange()
3627 		free_extent_map(em);  in find_delalloc_subrange()
3636 	if (*delalloc_end_ret + 1 == em->start)  in find_delalloc_subrange()
3639 	free_extent_map(em);  in find_delalloc_subrange()