fs/btrfs/file.c

2874 	u64 alloc_start = round_down(offset, sectorsize);
2879 	em = btrfs_get_extent(BTRFS_I(inode), NULL, alloc_start,
2880 			      alloc_end - alloc_start);
2894 	if (em->start <= alloc_start && (em->flags & EXTENT_FLAG_PREALLOC)) {
2912 		alloc_start = em_end;
2913 		ASSERT(IS_ALIGNED(alloc_start, sectorsize));
2914 		len = offset + len - alloc_start;
2915 		offset = alloc_start;
2922 		em = btrfs_get_extent(BTRFS_I(inode), NULL, alloc_start, sectorsize);
2945 		alloc_start = round_down(offset, sectorsize);
2946 		alloc_end = alloc_start + sectorsize;
2950 	alloc_start = round_up(offset, sectorsize);
2965 			alloc_start = round_down(offset, sectorsize);
2995 	if (alloc_start < alloc_end) {
2997 		const u64 lockstart = alloc_start;
3000 		bytes_to_reserve = alloc_end - alloc_start;
3009 						alloc_start, bytes_to_reserve);
3015 		ret = btrfs_prealloc_file_range(inode, mode, alloc_start,
3016 						alloc_end - alloc_start,
3031 					       alloc_start, bytes_to_reserve);
3048 	u64 alloc_start;
3064 	alloc_start = round_down(offset, blocksize);
3066 	cur_offset = alloc_start;
3095 	if (alloc_start > inode->i_size) {
3097 					alloc_start);
3119 	ret = btrfs_wait_ordered_range(inode, alloc_start,
3120 				       alloc_end - alloc_start);
3131 	lock_extent(&BTRFS_I(inode)->io_tree, alloc_start, locked_end,
3134 	btrfs_assert_inode_range_clean(BTRFS_I(inode), alloc_start, locked_end);
3220 	unlock_extent(&BTRFS_I(inode)->io_tree, alloc_start, locked_end,