fs/btrfs/file.c

2919 	u64 alloc_start = round_down(offset, sectorsize);
2924 	em = btrfs_get_extent(BTRFS_I(inode), NULL, alloc_start,
2925 			      alloc_end - alloc_start);
2939 	if (em->start <= alloc_start && (em->flags & EXTENT_FLAG_PREALLOC)) {
2957 		alloc_start = em_end;
2958 		ASSERT(IS_ALIGNED(alloc_start, sectorsize));
2959 		len = offset + len - alloc_start;
2960 		offset = alloc_start;
2967 		em = btrfs_get_extent(BTRFS_I(inode), NULL, alloc_start, sectorsize);
2990 		alloc_start = round_down(offset, sectorsize);
2991 		alloc_end = alloc_start + sectorsize;
2995 	alloc_start = round_up(offset, sectorsize);
3010 			alloc_start = round_down(offset, sectorsize);
3041 	if (alloc_start < alloc_end) {
3043 		const u64 lockstart = alloc_start;
3046 		bytes_to_reserve = alloc_end - alloc_start;
3055 						alloc_start, bytes_to_reserve);
3061 		ret = btrfs_prealloc_file_range(inode, mode, alloc_start,
3062 						alloc_end - alloc_start,
3077 					       alloc_start, bytes_to_reserve);
3094 	u64 alloc_start;
3110 	alloc_start = round_down(offset, blocksize);
3112 	cur_offset = alloc_start;
3141 	if (alloc_start > inode->i_size) {
3143 					alloc_start);
3166 	ret = btrfs_wait_ordered_range(BTRFS_I(inode), alloc_start,
3167 				       alloc_end - alloc_start);
3178 	btrfs_lock_extent(&BTRFS_I(inode)->io_tree, alloc_start, locked_end,
3181 	btrfs_assert_inode_range_clean(BTRFS_I(inode), alloc_start, locked_end);
3267 	btrfs_unlock_extent(&BTRFS_I(inode)->io_tree, alloc_start, locked_end,