btrfs_truncate_block
int btrfs_truncate_block(struct btrfs_inode *inode, u64 offset, u64 start, u64 end);
ret = btrfs_truncate_block(BTRFS_I(inode), offset + len - 1,
ret = btrfs_truncate_block(BTRFS_I(inode), offset, orig_start, orig_end);
ret = btrfs_truncate_block(BTRFS_I(inode),
ret = btrfs_truncate_block(BTRFS_I(inode), offset + len - 1,
ret = btrfs_truncate_block(BTRFS_I(inode), offset,
ret = btrfs_truncate_block(BTRFS_I(inode), offset + len - 1,
ret = btrfs_truncate_block(BTRFS_I(inode), inode->i_size,
ret = btrfs_truncate_block(inode, oldsize, oldsize, -1);
ret = btrfs_truncate_block(inode, inode->vfs_inode.i_size,