Hello,

Did you have a look at Shengyu Zhang's work on xattr? That's about
summer 2016. Also see glibc/sysdeps/mach/hurd/setxattr.c which
translates gnu attributes into RPC calls, and then again in the
translators's diskfs_set_translator. See for instance in
hurd/ext2fs/inode.c's diskfs_set_translator, it looks at

 if (EXT2_HAS_COMPAT_FEATURE (sblock, EXT2_FEATURE_COMPAT_EXT_ATTR)
      && use_xattr_translator_records)

Samuel

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