[LEDE-DEV] [PATCH] include: image.mk: ext4: double the default inode counter

[Felix Fietkau]

On 2016-11-22 17:57, David Lang wrote:
> On Tue, 22 Nov 2016, Felix Fietkau wrote:
> 
>> On 2016-11-22 17:48, David Lang wrote:
>>> On Tue, 22 Nov 2016, Felix Fietkau wrote:
>>>
>>>> On 2016-11-22 17:43, David Lang wrote:
>>>>> On Tue, 22 Nov 2016, Felix Fietkau wrote:
>>>>>
>>>>>>> On a 16M filesystem, we probably want to use a 1K block size and have an inode
>>>>>>> for every couple of blocks.
>>>>>> I'd say on a 16M filesystem we probably want to use squashfs+ext4
>>>>>> instead of plain ext4 and avoid the inode issue altogether.
>>>>>
>>>>> I'm not sure I understand how this would work?
>>>> Pad a plain squashfs image to the intended target size, include mke2fs
>>>> and mkf2fs (for bigger sizes) in the image.
>>>> fstools will take care of the rest at boot time.
>>>
>>> you still have to set the parameters for mkfs to use.
>> It will be created as an empty overlay filesystem, so there's lots of
>> free inodes available.
> 
> but by default, it wouldn't have lots of free inodes, the default is one inode 
> per 16K of filesystem, which is how we get to 1024 inodes on a 16M filesystem.
> 
> We need to be able to say that this is a tiny filesystem, and should really use 
> a smaller blocksize and more inodes.
FWIW, I just pushed a commit to my staging tree that adds squashfs
support for the uml target.
I tested it and it's usable with 16M rootfs.

- Felix