NAME

       vfs_fruit - Enhanced OS X and Netatalk interoperability

SYNOPSIS

       vfs objects = fruit

DESCRIPTION

       This VFS module is part of the samba(7) suite.

       The vfs_fruit module provides enhanced compatibility with Apple SMB clients and
       interoperability with a Netatalk 3 AFP fileserver.

       The module should be stacked with vfs_catia if enabling character conversion and must be
       stacked with vfs_streams_xattr, see the example section for the correct config.

       The module enables alternate data streams (ADS) support for a share, intercepts the OS X
       special streams "AFP_AfpInfo" and "AFP_Resource" and handles them in a special way. All
       other named streams are deferred to vfs_streams_xattr which must be loaded together with
       vfs_fruit.

       Be careful when mixing shares with and without vfs_fruit. OS X clients negotiate SMB2 AAPL
       protocol extensions on the first tcon, so mixing shares with and without fruit will
       globally disable AAPL if the first tcon is without fruit.

       Having shares with ADS support enabled for OS X client is worthwhile because it resembles
       the behaviour of Apple's own SMB server implementation and it avoids certain severe
       performance degradations caused by Samba's case sensitivity semantics.

       The OS X metadata and resource fork stream can be stored in a way compatible with Netatalk
       3 by setting fruit:resource = file and fruit:metadata = netatalk.

       OS X maps NTFS illegal characters to the Unicode private range in SMB requests. By setting
       fruit:encoding = native, all mapped characters are converted to native ASCII characters.

       Finally, share access modes are optionally checked against Netatalk AFP sharing modes by
       setting fruit:locking = netatalk.

       This module is not stackable other then described in this manpage.

GLOBAL OPTIONS

       The following options must be set in the global smb.conf section and won't take effect
       when set per share.

       fruit:aapl = yes | no
           A global option whether to enable Apple's SMB2+ extension codenamed AAPL. Default yes.
           This extension enhances several deficiencies when connecting from Macs:

                  •   directory enumeration is enriched with Mac relevant filesystem metadata
                      (UNIX mode, FinderInfo, resource fork size and effective permission), as a
                      result the Mac client doesn't need to fetch this metadata individuallly per
                      directory entry resulting in an often tremendous performance increase.

                  •   The ability to query and modify the UNIX mode of directory entries.

           There's a set of per share options that come into play when fruit:aapl is enabled.
           These opions, listed below, can be used to disable the computation of specific Mac
           metadata in the directory enumeration context, all are enabled by default:

                  •   readdir_attr:aapl_rsize = yes | no

                  •   readdir_attr:aapl_finder_info = yes | no

                  •   readdir_attr:aapl_max_access = yes | no

           See below for a description of these options.

       fruit:nfs_aces = yes | no
           A global option whether support for querying and modifying the UNIX mode of directory
           entries via NFS ACEs is enabled, default yes.

       fruit:copyfile = yes | no
           A global option whether to enable OS X specific copychunk ioctl that requests a copy
           of a whole file along with all attached metadata.

           WARNING: the copyfile request is blocking the client while the server does the copy.

           .             The default is no.

       fruit:zero_file_id = yes | no
           A global option whether to return zero to queries of on-disk file identifier, if the
           client has negotiated AAPL.

           Mac applications and / or the Mac SMB client code expect the on-disk file identifier
           to have the semantics of HFS+ Catalog Node Identifier (CNID). Samba doesn't provide
           those semantics, and that occasionally cause usability issues or even data loss.
           Returning a file identifier of zero causes the Mac client to stop using and trusting
           the file id returned from the server.

           The default is yes.

       fruit:model = MacSamba
           This option defines the model string inside the AAPL extension and will determine the
           appearance of the icon representing the Samba server in the Finder window.

           The default is MacSamba.

OPTIONS

       The following options can be set either in the global smb.conf section or per share.

       fruit:resource = [ file | xattr | stream ]
           Controls where the OS X resource fork is stored.

           Due to a spelling bug in all Samba versions older then 4.6.0, this option can also be
           given as fruit:ressource, ie with two s.

           Settings:

                  •   file (default) - use a ._ AppleDouble file compatible with OS X and
                      Netatalk

                  •   xattr - use a xattr, requires a filesystem with large xattr support and a
                      file IO API compatible with xattrs, this boils down to Solaris and derived
                      platforms and ZFS

                  •   stream (experimental) - pass the stream on to the next module in the VFS
                      stack.  Warning: this option should not be used with the streams_xattr
                      module due to the extended attributes size limitations of most filesytems.

       fruit:metadata = [ stream | netatalk ]
           Controls where the OS X metadata stream is stored:

                  •   netatalk (default) - use Netatalk compatible xattr

                  •   stream - pass the stream on to the next module in the VFS stack

       fruit:locking = [ netatalk | none ]

                  •   none (default) - no cross protocol locking

                  •   netatalk - use cross protocol locking with Netatalk

       fruit:encoding = [ native | private ]
           Controls how the set of illegal NTFS ASCII character, commonly used by OS X clients,
           are stored in the filesystem.

           Important: this is known to not fully work with fruit:metadata=stream or
           fruit:resource=stream.

                  •   private (default) - store characters as encoded by the OS X client: mapped
                      to the Unicode private range

                  •   native - store characters with their native ASCII value.  Important: this
                      option requires the use of vfs_catia in the VFS module stack as shown in
                      the examples section.

       fruit:veto_appledouble = yes | no
           Note: this option only applies when fruit:resource is set to file (the default).

           When fruit:resource is set to file, vfs_fruit may create ._ AppleDouble files. This
           options controls whether these ._ AppleDouble files are vetoed which prevents the
           client from accessing them.

           Vetoing ._ files may break some applications, eg extracting Mac ZIP archives from Mac
           clients failes, because they contain ._ files. Setting this option to false will fix
           this, but the abstraction leak of exposing the internally created ._ files may have
           other unknown side effects.

           The default is yes.

       fruit:posix_rename = yes | no
           Whether to enable POSIX directory rename behaviour for OS X clients. Without this,
           directories can't be renamed if any client has any file inside it (recursive!) open.

           The default is yes.

       readdir_attr:aapl_rsize = yes | no
           Return resource fork size in SMB2 FIND responses.

           The default is yes.

       readdir_attr:aapl_finder_info = yes | no
           Return FinderInfo in SMB2 FIND responses.

           The default is yes.

       readdir_attr:aapl_max_access = yes | no
           Return the user's effective maximum permissions in SMB2 FIND responses. This is an
           expensive computation, setting this to off pretends the use has maximum effective
           permissions.

           The default is yes.

EXAMPLES

                   [share]
                vfs objects = catia fruit streams_xattr
                fruit:resource = file
                fruit:metadata = netatalk
                fruit:locking = netatalk
                fruit:encoding = native

AUTHOR

       The original Samba software and related utilities were created by Andrew Tridgell. Samba
       is now developed by the Samba Team as an Open Source project similar to the way the Linux
       kernel is developed.