Re: Kernel feature support - filesystems and networking


Jan Kiszka
 

On 2017-05-29 04:40, 小口琢夫 / KOGUCHI,TAKUO wrote:
Hi Ben,

Thanks for your efforts.

- overlayfs (CONFIG_OVERLAY_FS)
OVERLAY_FS is one of the features Hitachi wants to use.
I hope you look into this further and I would like to know if other members also want it.
We plan to use this feature with CIP kernels as well.

Regards,
Jan

Best regards,

Takuo Koguchi,
Hitachi, Ltd.


-----Original Message-----
From: cip-dev-bounces@...
[mailto:cip-dev-bounces@...] On Behalf Of Ben Hutchings
Sent: Monday, May 29, 2017 11:13 AM
To: cip-dev@...
Subject: [!][cip-dev] Kernel feature support - filesystems and networking

I apologise for the long delay in responding to the kernel config files I was given. Here's a
first list of features I would like to *not* support. I expect to be able to send additional lists
soon. Let me know if you really need some of the features listed below, and if you have
any ideas about how to mitigate the problems I see.

The following features are enabled in some of the configurations I was sent but seem to
be unsupportable over CIP's time scale:

File systems:
- btrfs (CONFIG_BTRFS_FS)
- Too rapidly changing to backport most fixes
- ceph (CONFIG_CEPH_LIB, CONFIG_CEPH_FS)
- Complex network protocol which is likely to need many fixes
- cifs (CONFIG_CIFS_FS)
- Complex network protocol which is likely to need many fixes
- nfs (CONFIG_NFS_FS, CONFIG_NFSD)
- Complex network protocol which is likely to need many fixes
- ufs (CONFIG_UFS_FS)
- No work by current maintainer for 7 years
- xfs (CONFIG_XFS_FS)
- Maintainers unsupportive of backporting fixes

Networking:
- batman-adv (CONFIG_BATMAN_ADV)
- Rapidly changing
- caif (CONFIG_CAIF)
- No work by current maintainer for 5 years
- dcb (CONFIG_DCB)
- No current maintainer
- hsr (CONFIG_HSR)
- No work by current maintainer for 2 years
- llc2 (CONFIG_LLC2)
- No work by current maintainer for 7 years
- phonet (CONFIG_PHONET)
- Dead protocol
- sctp (CONFIG_IP_SCTP)
- Poor security record
- wimax (CONFIG_WIMAX)
- Dead protocol
- x25 (CONFIG_X25)
- Poor security record

I have some doubts about whether these can be supported:

- ntfs (CONFIG_NTFS_FS)
- Fixes are never marked for stable
- overlayfs (CONFIG_OVERLAY_FS)
- I found many apparently important bug fixes in later kernel
versions that have not been backported

Ben.

--
Ben Hutchings
Software Developer, Codethink Ltd.


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