Re: [PATCH] Improve ext2 driver to allow embedding of the boot loader code.

[Vladimir 'φ-coder/phcoder' Serbinenko]

On 21.01.2014 09:41, Andrey Borzenkov wrote:
> On Tue, Jan 21, 2014 at 12:32 PM, Vladimir 'φ-coder/phcoder'
> Serbinenko <address@hidden> wrote:
>> On 21.01.2014 09:28, Andrey Borzenkov wrote:
>>> On Tue, Jan 21, 2014 at 12:14 PM, Vladimir 'φ-coder/phcoder'
>>> Serbinenko <address@hidden> wrote:
>>>> On 10.01.2014 08:49, Dr. Tilmann Bubeck wrote:
>>>>>
>>>>> The blocklist is fixed and stable and will never change.
>>>> What guarantees that it won't change on grub-setup invocation? I'm under
>>>> impression that it will change on every grub-setup invocation as file
>>>> gets recreated.
>>>>
>>>
>>> If I read code correctly, it checks current size and if new core.img
>>> fits, space is reused. So we could effectively make it preallocate
>>> reasonable size (or even unreasonable - I guess 10MB will be enough
>>> for foreseeable future) the very first time it is done.
>>>
>> It still doesn't solve the problem that during operations file becomes a
>> normal file and OS is allowed to rearrange the blocks as it sees fit.
> 
> Would this be acceptable - use external utility to allocate
> EXT2_BOOT_LOADER_INO space of sufficient size once (outside of grub at
> all) and allow embedding into extX if this space exists? Do not mess
> with with it in grub-setup itself?
> 
This presents a problem with sync'ing. After this space was reserved it
won't appear when using block functions until next sync'ing. This would
result in install failure on a new filesystem.
> We could then speak with ext2 folks to add option to mke2fs/une2fs in
> the long run it it does not exist yet.
> 
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