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SubjectRe: [RFC] ext2_new_block() behaviour


On Tue, 2 Jan 2001, Andreas Dilger wrote:

> This predates me by a while, but I suspect that it is done this way on
> the assumption it is easier to seek forward on the disk while reading
> a file rather than seeking backwards. Also, since with new inodes the
> goal is initially the first block of the group where the inode lives,
> the blocks at the start of a group will generally be allocated already,
> so it is usually a waste of time checking the start of the group for
> free blocks.

Umm... OK, the last argument is convincing. Thanks...

BTW, what was the reason behind doing preallocation for directories on
ext2_bread() level? We both buy ourselves an oddity in directory structure
(preallocated blocks become refered from the inode immediately and they
are beyond i_size) and get more complicated ext2_alloc_block(). What do
we win here?
Cheers,
Al

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