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34 .Nd configure and mount an in-memory file system using the
41 .Op Fl b Ar block-size
42 .Op Fl c Ar blocks-per-cylinder-group
43 .Op Fl d Ar max-extent-size
44 .Op Fl E Ar path-mdconfig
49 .Op Fl m Ar percent-free
50 .Op Fl O Ar optimization
51 .Op Fl o Ar mount-options
52 .Op Fl p Ar permissions
56 .Op Fl w Ar user : Ns Ar group
62 utility is designed to be a work-alike and look-alike of the deprecated
64 The end result is essentially the same,
65 but is accomplished in a completely different way.
72 puts a UFS file system on it (unless
80 compressed disk images, as long as the kernel supports this GEOM class.
81 All the command line options are passed to the appropriate program
82 at the appropriate stage in order to achieve the desired effect.
88 disk with soft-updates enabled
102 auto-unit feature to automatically select an unused device.
103 Unless otherwise specified with one of the options below,
104 it uses the default arguments to all the helper programs.
106 The following options are available.
108 the option letter matches the one used by
111 .Bl -tag -width indent
112 .It Fl a Ar maxcontig
113 Specify the maximum number of contiguous blocks that will be laid
114 out before forcing a rotational delay
118 .It Fl b Ar block-size
119 The block size of the file system, in bytes.
120 .It Fl c Ar blocks-per-cylinder-group
121 The number of blocks per cylinder group in the file system.
123 If not using auto-unit,
126 to try to detach the unit before attaching it.
127 .It Fl d Ar max-extent-size
128 The file system may choose to store large files using extents.
129 This parameter specifies the largest extent size that may be
130 used. It is presently limited to its default value which is 16
131 times the file system blocksize.
132 .It Fl E Ar path-mdconfig
139 Indicate the maximum number of blocks any single file can allocate
140 out of a cylinder group before it is forced to begin allocating
141 blocks from another cylinder group.
143 Create a vnode-backed
145 memory disk backed by
147 .It Fl f Ar frag-size
148 The fragment size of the file system in bytes.
150 Number of bytes per inode.
152 Enable multilabel MAC on the new file system.
154 Show the output of the helper programs.
163 instead of a swap-backed disk.
164 .It Fl m Ar percent-free
165 The percentage of space reserved for the superuser.
167 Do not actually run the helper programs.
168 This is most useful in conjunction with
173 directory on the new file system.
174 .It Fl O Ar optimization
175 Select the optimization preference;
180 which will optimize for minimum space fragmentation and
181 minimum time spent allocating blocks,
183 .It Fl o Ar mount-options
184 Specify the mount options with which to mount the file system.
187 for more information.
189 Preserve the existing file system;
192 This only makes sense if
194 is specified to create a vnode-backed disk.
195 .It Fl p Ar permissions
196 Set the file (directory) permissions of the mount point
202 argument can be in any of the mode formats recognized by
204 If symbolic permissions are specified,
205 the operation characters
209 are interpreted relative to the initial permissions of
212 Do not enable soft-updates on the file system.
214 Specify the size of the disk to create.
215 This only makes sense if
221 this will work for the default swap-backed
230 Turn on the TRIM enable flag for
232 When used with a file system that issue BIO_DELETE bio requests,
234 returns deleted blocks to the system memory pool.
236 Specify a file system type for a vnode-backed memory disk.
237 Any file system supported by
239 command can be specified.
240 This option only makes sense when
246 Enable soft-updates on the file system.
247 This is the default, and is accepted only
249 It is only really useful to negate the
251 flag, should such a need occur.
253 Specify the UFS version number for use on the file system; it may be
258 The default is derived from the default of the
261 .It Fl w Ar user : Ns Ar group
262 Set the owner and group to
267 The arguments have the same semantics as with
269 but specifying just a
275 Print what command will be run before running it, and
276 other assorted debugging information.
283 options are passed to
291 .Fl a , b , c , d , e , f , i , m
294 options are passed to
296 with the same letter.
307 with the same letter.
314 See the programs that the options are passed to for more information
317 Create and mount a 32 megabyte swap-backed file system on
320 .Dl "mdmfs -s 32m md /tmp"
322 The same file system created as an entry in
325 .Dl "md /tmp mfs rw,-s32m 2 0"
327 Create and mount a 16 megabyte malloc-backed file system on
333 do not use soft-updates on it and mount it
336 .Dl "mdmfs -M -S -o async -s 16m md1 /tmp"
340 based compressed disk image:
342 .Dl "mdmfs -P -F foo.uzip -oro md.uzip /tmp/"
344 Mount the same image, specifying the
348 .Dl "mdmfs -P -F foo.uzip -oro md1.uzip /tmp/"
350 Configure a vnode-backed file system and mount its first partition,
351 using automatic device numbering:
353 .Dl "mdmfs -P -F foo.img mds1a /tmp/"
355 Mount a vnode-backed cd9660 file system using automatic device numbering:
357 .Dl "mdmfs -T cd9660 -P -F foo.iso md /tmp"
361 utility, while designed to be compatible with
363 can be useful by itself.
366 had some silly defaults, a
368 mode is provided for the case where bug-to-bug compatibility is desired.
370 Compatibility is enabled by starting
377 .Xr getprogname 3 ) .
378 In this mode, the following behavior, as done by
381 .Bl -bullet -offset indent
389 was given on the command line.