On Thu, 2024-04-18 at 15:21 -0500, 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)? POSIX <-> POSIX locking over SMB is something I have a client trying to get working with SMB3. They have a use case where, as I understand it so far, the mapping of POSIX fcntl() read and write locks to SMB locks isn't 1-1, because they expect advisory locks, but SMB locks are mandatory as far as I read it. They use cifs.ko and Samba, so it isn't about working with Windows, it is about running Libreoffice on LInux against Samba. Andrew Bartlett
