VFS_FRUIT(8) System Administration tools VFS_FRUIT(8)NAMEvfs_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.
Samba 4.7 11/23/2017 VFS_FRUIT(8)
