3347 static int btrfs_cmp_data_prepare(struct inode *src, u64 loff,  in btrfs_cmp_data_prepare()  argument
3356 	ret = gather_extent_pages(src, cmp->src_pages, num_pages, loff);  in btrfs_cmp_data_prepare()
3430 static int btrfs_extent_same_range(struct inode *src, u64 loff, u64 olen,  in btrfs_extent_same_range()  argument
3440 	ret = extent_same_check_offsets(src, loff, &len, olen);  in btrfs_extent_same_range()
3467 		if (dst_loff + len > loff && dst_loff < loff + len)  in btrfs_extent_same_range()
3470 		same_lock_start = min_t(u64, loff, dst_loff);  in btrfs_extent_same_range()
3471 		same_lock_len = max_t(u64, loff, dst_loff) + len - same_lock_start;  in btrfs_extent_same_range()
3484 		if (loff + olen == i_size_read(src) &&  in btrfs_extent_same_range()
3488 			len = round_down(i_size_read(src), sz) - loff;  in btrfs_extent_same_range()
3494 	ret = btrfs_cmp_data_prepare(src, loff, dst, dst_loff, olen, cmp);  in btrfs_extent_same_range()
3502 		ret = btrfs_double_extent_lock(src, loff, dst, dst_loff, len,  in btrfs_extent_same_range()
3522 			btrfs_wait_ordered_range(src, loff, len);  in btrfs_extent_same_range()
3537 		ret = btrfs_clone(src, dst, loff, olen, len, dst_loff, 1);  in btrfs_extent_same_range()
3543 		btrfs_double_extent_unlock(src, loff, dst, dst_loff, len);  in btrfs_extent_same_range()
3552 static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,  in btrfs_extent_same()  argument
3586 	if (same_inode && dst_loff < loff)  in btrfs_extent_same()
3587 		swap(loff, dst_loff);  in btrfs_extent_same()
3604 		ret = btrfs_extent_same_range(src, loff, BTRFS_MAX_DEDUPE_LEN,  in btrfs_extent_same()
3609 		loff += BTRFS_MAX_DEDUPE_LEN;  in btrfs_extent_same()
3614 		ret = btrfs_extent_same_range(src, loff, tail_len, dst,  in btrfs_extent_same()