1VFS_FRUIT(8) System Administration tools VFS_FRUIT(8)
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6 vfs_fruit - Enhanced OS X and Netatalk interoperability
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9 vfs objects = fruit
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12 This VFS module is part of the samba(7) suite.
13 The vfs_fruit module provides enhanced compatibility with Apple SMB
15 clients and interoperability with a Netatalk 3 AFP fileserver.
16 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 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.
25 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 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 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.
39 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.
43 Finally, share access modes are optionally checked against Netatalk AFP
45 sharing modes by setting fruit:locking = netatalk.
46 This module is not stackable other than described in this manpage.
48
50 The following options must be set in the global smb.conf section and
51 won't take effect when set per share.
52 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 · 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 · The ability to query and modify the UNIX mode of
66 directory entries.
67 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 · readdir_attr:aapl_rsize = yes | no
74 · readdir_attr:aapl_finder_info = yes | no
76 · readdir_attr:aapl_max_access = yes | no
78 See below for a description of these options.
80 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 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 WARNING: the copyfile request is blocking the client while the
91 server does the copy.
92 The default is no.
94 fruit:zero_file_id = yes | no
96 A global option whether to return zero to queries of on-disk file
97 identifier, if the client has negotiated AAPL.
98 Mac applications and / or the Mac SMB client code expect the
100 on-disk file identifier to have the semantics of HFS+ Catalog Node
101 Identifier (CNID). Samba doesn't provide those semantics, and that
102 occasionally cause usability issues or even data loss. Returning a
103 file identifier of zero causes the Mac client to stop using and
104 trusting the file id returned from the server.
105 The default is yes.
107 fruit:model = MacSamba
109 This option defines the model string inside the AAPL extension and
110 will determine the appearance of the icon representing the Samba
111 server in the Finder window.
112 The default is MacSamba.
114
116 The following options can be set either in the global smb.conf section
117 or per share.
118 fruit:resource = [ file | xattr | stream ]
120 Controls where the OS X resource fork is stored.
121 Due to a spelling bug in all Samba versions older then 4.6.0, this
123 option can also be given as fruit:ressource, ie with two s.
124 Settings:
126 · file (default) - use a ._ AppleDouble file compatible
128 with OS X and Netatalk
129 · xattr - use a xattr, requires a filesystem with large
131 xattr support and a file IO API compatible with xattrs,
132 this boils down to Solaris and derived platforms and ZFS
133 · stream (experimental) - pass the stream on to the next
135 module in the VFS stack. Warning: this option should
136 not be used with the streams_xattr module due to the
137 extended attributes size limitations of most filesytems.
138 fruit:time machine = [ yes | no ]
141 Controls if Time Machine support via the FULLSYNC volume capability
142 is advertised to clients.
143 · yes - Enables Time Machine support for this share. Also
145 registers the share with mDNS in case Samba is built
146 with mDNS support.
147 · no (default) Disables advertising Time Machine support.
149 This option enforces the following settings per share (or for all
151 shares if enabled globally):
152 · durable handles = yes
154 · kernel oplocks = no
156 · kernel share modes = no
158 · posix locking = no
160 fruit:time machine max size = SIZE [K|M|G|T|P]
163 Useful for Time Machine: limits the reported disksize, thus
164 preventing Time Machine from using the whole real disk space for
165 backup. The option takes a number plus an optional unit.
166 IMPORTANT: This is an approximated calculation that only takes into
168 account the contents of Time Machine sparsebundle images. Therefor
169 you MUST NOT use this volume to store other content when using this
170 option, because it would NOT be accounted.
171 The calculation works by reading the band size from the Info.plist
173 XML file of the sparsebundle, reading the bands/ directory counting
174 the number of band files, and then multiplying one with the other.
175 fruit:metadata = [ stream | netatalk ]
177 Controls where the OS X metadata stream is stored:
178 · netatalk (default) - use Netatalk compatible xattr
180 · stream - pass the stream on to the next module in the
182 VFS stack
183 fruit:locking = [ netatalk | none ]
186 · none (default) - no cross protocol locking
189 · netatalk - use cross protocol locking with Netatalk
191 fruit:encoding = [ native | private ]
194 Controls how the set of illegal NTFS ASCII character, commonly used
195 by OS X clients, are stored in the filesystem.
196 Important: this is known to not fully work with
198 fruit:metadata=stream or fruit:resource=stream.
199 · private (default) - store characters as encoded by the
201 OS X client: mapped to the Unicode private range
202 · native - store characters with their native ASCII value.
204 Important: this option requires the use of vfs_catia in
205 the VFS module stack as shown in the examples section.
206 fruit:veto_appledouble = yes | no
209 Note: this option only applies when fruit:resource is set to file
210 (the default).
211 When fruit:resource is set to file, vfs_fruit may create ._
213 AppleDouble files. This options controls whether these ._
214 AppleDouble files are vetoed which prevents the client from
215 accessing them.
216 Vetoing ._ files may break some applications, e.g. extracting Mac
218 ZIP archives from Mac clients fails, because they contain ._ files.
219 rsync will also be unable to sync files beginning with underscores,
220 as the temporary files it uses for these will start with ._ and so
221 cannot be created.
222 Setting this option to false will fix this, but the abstraction
224 leak of exposing the internally created ._ files may have other
225 unknown side effects.
226 The default is yes.
228 fruit:posix_rename = yes | no
230 Whether to enable POSIX directory rename behaviour for OS X
231 clients. Without this, directories can't be renamed if any client
232 has any file inside it (recursive!) open.
233 The default is yes.
235 readdir_attr:aapl_rsize = yes | no
237 Return resource fork size in SMB2 FIND responses.
238 The default is yes.
240 readdir_attr:aapl_finder_info = yes | no
242 Return FinderInfo in SMB2 FIND responses.
243 The default is yes.
245 readdir_attr:aapl_max_access = yes | no
247 Return the user's effective maximum permissions in SMB2 FIND
248 responses. This is an expensive computation, setting this to off
249 pretends the use has maximum effective permissions.
250 The default is yes.
252 fruit:wipe_intentionally_left_blank_rfork = yes | no
254 Whether to wipe Resource Fork data that matches the special 286
255 bytes sized placeholder blob that macOS client create on occasion.
256 The blob contains a string “This resource fork intentionally left
257 blank”, the remaining bytes being mostly zero. There being no one
258 use of this data, it is probably safe to discard it. When this
259 option is enabled, this module truncates the Resource Fork stream
260 to 0 bytes.
261 The default is no.
263 fruit:delete_empty_adfiles = yes | no
265 Whether to delete empty AppleDouble files. Empty means that the
266 resource fork entry in the AppleDouble files is of size 0, or the
267 size is exactly 286 bytes and the content matches a special
268 boilerplate resource fork created my macOS.
269 The default is no.
271
273 [share]
274 vfs objects = catia fruit streams_xattr
275 fruit:resource = file
276 fruit:metadata = netatalk
277 fruit:locking = netatalk
278 fruit:encoding = native
279
281 The original Samba software and related utilities were created by
282 Andrew Tridgell. Samba is now developed by the Samba Team as an Open
283 Source project similar to the way the Linux kernel is developed.
284Samba 4.10.4 05/28/2019 VFS_FRUIT(8)