On Fri, Apr 19, 2024 at 06:53:01PM +0200, Ralph Boehme wrote:
On 4/18/24 22:21, Steve French via samba-technical wrote:
Was following up on a recent question about support for Linux features
that are missing that could help us pass more xfstests
Looking at the standard fstests for Linux (xfstests that are skipped
or fail for cifs.ko) to find 'features' that would help, perhaps
extending the current POSIX Extensions or adding a couple of SMB3.1.1
FSCTLs, I spotted a few obvious ones:
1) renameat2 (RENAME_EXCHANGE) and renameat2(WHITEOUT) 2) FITRIM
support 3) trusted namespace (perhaps xattr/EA extension) 4) attr
namespace 5) deduplication 6) chattr -i 7) unshare (namespace command)
8) delayed allocation 9) dax 10) attr namespace security 11) fstrim
12) chattr +s 13) exchange range
Any thoughts on which of these which would be 'easy' for samba and/or
ksmbd server to implement (e.g. as new fsctls)?
well, I guess none of these will be really "easy".
Iirc when I last brough up file attributes, we vetted towards
postponing this kind of stuff until we have full support for the core
SMB3 POSIX features in Samba. Iirc the only real thing missing there
is symlink/reparse point handling and for that we need to settle on
which reparse type to use (WSL vs NFS) as discussed yesterday. It
would be a *huge* help Steve, if you can pursue this internally, this
has been a blocker for the whole project since quite some time...
renameat2 (RENAME_EXCHANGE) and renameat2(WHITEOUT) need to be
mapped into Windows SMB3 operations. We should not (IMHO) add new
SMB3 operation semantics into POSIX that overlap existing Windows
SMB3 operations.
