Re: Default ext inode size

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On Fri, Nov 14, 2008 at 1:26 AM, Phillip Susi <psusi@xxxxxxxxxx> wrote:
> I noticed that the default inode size for mkfs in e2fsprogs has been changed
> to 256 bytes.  I noticed this because I am seeing users complain that they
> can no longer access their ext partitions using the windows driver, which
> only supports normal 128 byte inodes.  I'd like to know why this default was
> changed.
>
> As I understand it, the larger inode size means that ea/acl can be stored
> directly in the inode.  Are there any other benefits?  It seems that using
> extended attributes is rather uncommon in the first place, and that when
> they are used, many files often share them so it would be better to leave
> them in the shared data block rather than duplicate them in every inode.
>  This leaves me wondering where is the common case that benefits from a
> larger default inode?

The larger inode is also needed to support new features like
nanosecond timestamps, creation time, 64-bit inode versions.

If you want to override the 256-byte inode default, you can use "-I
128" while formatting your filesystems with mke2fs.

Thanks,
Kalpak
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