1VFS_FRUIT(8)              System Administration tools             VFS_FRUIT(8)
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NAME

6       vfs_fruit - Enhanced OS X and Netatalk interoperability
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SYNOPSIS

9       vfs objects = fruit
10

DESCRIPTION

12       This VFS module is part of the samba(7) suite.
13
14       The vfs_fruit module provides enhanced compatibility with Apple SMB
15       clients and interoperability with a Netatalk 3 AFP fileserver.
16
17       The module should be stacked with vfs_catia if enabling character
18       conversion and must be stacked with vfs_streams_xattr, see the example
19       section for the correct config.
20
21       The module enables alternate data streams (ADS) support for a share,
22       intercepts the OS X special streams "AFP_AfpInfo" and "AFP_Resource"
23       and handles them in a special way. All other named streams are deferred
24       to vfs_streams_xattr which must be loaded together with vfs_fruit.
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26       Be careful when mixing shares with and without vfs_fruit. OS X clients
27       negotiate SMB2 AAPL protocol extensions on the first tcon, so mixing
28       shares with and without fruit will globally disable AAPL if the first
29       tcon is without fruit.
30
31       Having shares with ADS support enabled for OS X client is worthwhile
32       because it resembles the behaviour of Apple's own SMB server
33       implementation and it avoids certain severe performance degradations
34       caused by Samba's case sensitivity semantics.
35
36       The OS X metadata and resource fork stream can be stored in a way
37       compatible with Netatalk 3 by setting fruit:resource = file and
38       fruit:metadata = netatalk.
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40       OS X maps NTFS illegal characters to the Unicode private range in SMB
41       requests. By setting fruit:encoding = native, all mapped characters are
42       converted to native ASCII characters.
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44       Finally, share access modes are optionally checked against Netatalk AFP
45       sharing modes by setting fruit:locking = netatalk.
46
47       This module is not stackable other than described in this manpage.
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GLOBAL OPTIONS

50       The following options must be set in the global smb.conf section and
51       won't take effect when set per share.
52
53       fruit:aapl = yes | no
54           A global option whether to enable Apple's SMB2+ extension codenamed
55           AAPL. Default yes. This extension enhances several deficiencies
56           when connecting from Macs:
57
58                  •   directory enumeration is enriched with Mac relevant
59                      filesystem metadata (UNIX mode, FinderInfo, resource
60                      fork size and effective permission), as a result the Mac
61                      client doesn't need to fetch this metadata individually
62                      per directory entry resulting in an often tremendous
63                      performance increase.
64
65                  •   The ability to query and modify the UNIX mode of
66                      directory entries.
67
68           There's a set of per share options that come into play when
69           fruit:aapl is enabled. These options, listed below, can be used to
70           disable the computation of specific Mac metadata in the directory
71           enumeration context, all are enabled by default:
72
73                  •   readdir_attr:aapl_rsize = yes | no
74
75                  •   readdir_attr:aapl_finder_info = yes | no
76
77                  •   readdir_attr:aapl_max_access = yes | no
78
79           See below for a description of these options.
80
81       fruit:nfs_aces = yes | no
82           A global option whether support for querying and modifying the UNIX
83           mode of directory entries via NFS ACEs is enabled, default yes.
84
85       fruit:copyfile = yes | no
86           A global option whether to enable OS X specific copychunk ioctl
87           that requests a copy of a whole file along with all attached
88           metadata.
89
90           WARNING: the copyfile request is blocking the client while the
91           server does the copy.
92
93           The default is no.
94
95       fruit:model = MacSamba
96           This option defines the model string inside the AAPL extension and
97           will determine the appearance of the icon representing the Samba
98           server in the Finder window.
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100           The default is MacSamba.
101

OPTIONS

103       The following options can be set either in the global smb.conf section
104       or per share.
105
106       fruit:resource = [ file | xattr | stream ]
107           Controls where the OS X resource fork is stored.
108
109           Due to a spelling bug in all Samba versions older then 4.6.0, this
110           option can also be given as fruit:ressource, ie with two s.
111
112           Settings:
113
114                  •   file (default) - use a ._ AppleDouble file compatible
115                      with OS X and Netatalk
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117                  •   xattr - use a xattr, requires a filesystem with large
118                      xattr support and a file IO API compatible with xattrs,
119                      this boils down to Solaris and derived platforms and ZFS
120
121                  •   stream (experimental) - pass the stream on to the next
122                      module in the VFS stack.  Warning: this option should
123                      not be used with the streams_xattr module due to the
124                      extended attributes size limitations of most
125                      filesystems.
126
127
128       fruit:time machine = [ yes | no ]
129           Controls if Time Machine support via the FULLSYNC volume capability
130           is advertised to clients.
131
132                  •   yes - Enables Time Machine support for this share. Also
133                      registers the share with mDNS in case Samba is built
134                      with mDNS support.
135
136                  •   no (default) Disables advertising Time Machine support.
137
138           This option enforces the following settings per share (or for all
139           shares if enabled globally):
140
141                  •   durable handles = yes
142
143                  •   kernel oplocks = no
144
145                  •   kernel share modes = no
146
147                  •   posix locking = no
148
149
150       fruit:time machine max size = SIZE [K|M|G|T|P]
151           Useful for Time Machine: limits the reported disksize, thus
152           preventing Time Machine from using the whole real disk space for
153           backup. The option takes a number plus an optional unit.
154
155           IMPORTANT: This is an approximated calculation that only takes into
156           account the contents of Time Machine sparsebundle images. Therefore
157           you MUST NOT use this volume to store other content when using this
158           option, because it would NOT be accounted.
159
160           The calculation works by reading the band size from the Info.plist
161           XML file of the sparsebundle, reading the bands/ directory counting
162           the number of band files, and then multiplying one with the other.
163
164       fruit:metadata = [ stream | netatalk ]
165           Controls where the OS X metadata stream is stored:
166
167                  •   netatalk (default) - use Netatalk compatible xattr
168
169                  •   stream - pass the stream on to the next module in the
170                      VFS stack
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172
173       fruit:locking = [ netatalk | none ]
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175
176                  •   none (default) - no cross protocol locking
177
178                  •   netatalk - use cross protocol locking with Netatalk
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180
181       fruit:encoding = [ native | private ]
182           Controls how the set of illegal NTFS ASCII character, commonly used
183           by OS X clients, are stored in the filesystem.
184
185           Important: this is known to not fully work with
186           fruit:metadata=stream or fruit:resource=stream.
187
188                  •   private (default) - store characters as encoded by the
189                      OS X client: mapped to the Unicode private range
190
191                  •   native - store characters with their native ASCII value.
192                      Important: this option requires the use of vfs_catia in
193                      the VFS module stack as shown in the examples section.
194
195
196       fruit:veto_appledouble = yes | no
197           Note: this option only applies when fruit:resource is set to file
198           (the default).
199
200           When fruit:resource is set to file, vfs_fruit may create ._
201           AppleDouble files. This options controls whether these ._
202           AppleDouble files are vetoed which prevents the client from
203           accessing them.
204
205           Vetoing ._ files may break some applications, e.g. extracting Mac
206           ZIP archives from Mac clients fails, because they contain ._ files.
207           rsync will also be unable to sync files beginning with underscores,
208           as the temporary files it uses for these will start with ._ and so
209           cannot be created.
210
211           Setting this option to false will fix this, but the abstraction
212           leak of exposing the internally created ._ files may have other
213           unknown side effects.
214
215           The default is yes.
216
217       fruit:posix_rename = yes | no
218           Whether to enable POSIX directory rename behaviour for OS X
219           clients. Without this, directories can't be renamed if any client
220           has any file inside it (recursive!) open.
221
222           The default is yes.
223
224       readdir_attr:aapl_rsize = yes | no
225           Return resource fork size in SMB2 FIND responses.
226
227           The default is yes.
228
229       readdir_attr:aapl_finder_info = yes | no
230           Return FinderInfo in SMB2 FIND responses.
231
232           The default is yes.
233
234       readdir_attr:aapl_max_access = yes | no
235           Return the user's effective maximum permissions in SMB2 FIND
236           responses. This is an expensive computation, setting this to off
237           pretends the use has maximum effective permissions.
238
239           The default is yes.
240
241       fruit:wipe_intentionally_left_blank_rfork = yes | no
242           Whether to wipe Resource Fork data that matches the special 286
243           bytes sized placeholder blob that macOS client create on occasion.
244           The blob contains a string “This resource fork intentionally left
245           blank”, the remaining bytes being mostly zero. There being no one
246           use of this data, it is probably safe to discard it. When this
247           option is enabled, this module truncates the Resource Fork stream
248           to 0 bytes.
249
250           The default is no.
251
252       fruit:delete_empty_adfiles = yes | no
253           Whether to delete empty AppleDouble files. Empty means that the
254           resource fork entry in the AppleDouble files is of size 0, or the
255           size is exactly 286 bytes and the content matches a special
256           boilerplate resource fork created my macOS.
257
258           The default is no.
259
260       fruit:zero_file_id = yes | no
261           Whether to return zero to queries of on-disk file identifier if the
262           client has negotiated AAPL.
263
264           Mac applications and / or the Mac SMB client code expect the
265           on-disk file identifier to have the semantics of HFS+ Catalog Node
266           Identifier (CNID). Samba provides File-IDs based on a file's inode
267           number which gets recycled across file creation and deletion and
268           can therefor not be used for Mac client. Returning a file
269           identifier of zero causes the Mac client to stop using and trusting
270           the file id returned from the server.
271
272           The default is yes.
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EXAMPLES

275                   [share]
276                vfs objects = catia fruit streams_xattr
277                fruit:resource = file
278                fruit:metadata = netatalk
279                fruit:locking = netatalk
280                fruit:encoding = native
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AUTHOR

283       The original Samba software and related utilities were created by
284       Andrew Tridgell. Samba is now developed by the Samba Team as an Open
285       Source project similar to the way the Linux kernel is developed.
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289Samba 4.17.5                      01/26/2023                      VFS_FRUIT(8)
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