Commits on Feb 16, 2023

1. Ensure that commonly requested xattrs are in SA …

   Now that we have SA-based xattrs on FreeBSD we should
   ensure that certain important samba-related xattrs are
   written to this area rather than in the xattr dir. This
   avoids having to perform more expensive permissions check,
   lookup, and read.
   
   Since we can't always know what the contents of these xattrs
   will be beforehand, store empty xattrs and have Samba internally
   assign special meaning to the ones with no value (e.g. fail
   read with ENOATTR). This is sufficient to mask the attributes
   from SMB clients since vfs_streams_xattr will attempt to
   FGETXATTR prior to appending the xattr to STREAM_INFO response.
   
   Three attributes to be stored in this way are:
   - user.DOSATTRIB (always requested for files)
   - stream (AFP_AfpInfo) which is used by VFS fruit to generate
     response to SMB2 FIND_INFO requests when AAPL context negotiated.
   - stream (AFP_Resource) which is requested by Finder to check for
     metadata related to icons or other usage of resource forks.

   

   anodos325 committed Feb 16, 2023
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