[PATCH v8 11/24] erofs: introduce xattr & posixacl support

Gao Xiang gaoxiang25 at huawei.com
Mon Sep 2 15:10:29 UTC 2019

Hi Christoph,

On Mon, Sep 02, 2019 at 08:06:40AM -0700, Christoph Hellwig wrote:
> On Mon, Sep 02, 2019 at 04:20:37PM +0200, David Sterba wrote:
> > Oh right, I think the reasons are historical and that we can remove the
> > options nowadays. From the compatibility POV this should be safe, with
> > ACLs compiled out, no tool would use them, and no harm done when the
> > code is present but not used.
> > 
> > There were some efforts by embedded guys to make parts of kernel more
> > configurable to allow removing subsystems to reduce the final image
> > size. In this case I don't think it would make any noticeable
> > difference, eg. the size of fs/btrfs/acl.o on release config is 1.6KiB,
> > while the whole module is over 1.3MiB.
> Given that the erofs folks have an actual use case for it I think
> it is fine to keep the options, I just wanted to ensure this wasn't
> copy and pasted for no good reason.  Note that for XFS we don't have
> an option for xattrs, as those are integral to a lot of file system
> features.  WE have an ACL option mostly for historic reasons.

I fully understand your starting point...

Gao Xiang

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