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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 n Ar rotational-positions
51 .Op Fl O Ar optimization
52 .Op Fl o Ar mount-options
53 .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
170 .It Fl n Ar rotational-positions
171 The default number of rotational positions to distinguish.
172 .It Fl O Ar optimization
173 Select the optimization preference;
178 which will optimize for minimum space fragmentation and
179 minimum time spent allocating blocks,
181 .It Fl o Ar mount-options
182 Specify the mount options with which to mount the file system.
185 for more information.
187 Preserve the existing file system;
190 This only makes sense if
192 is specified to create a vnode-backed disk.
193 .It Fl p Ar permissions
194 Set the file (directory) permissions of the mount point
200 argument can be in any of the mode formats recognized by
202 If symbolic permissions are specified,
203 the operation characters
207 are interpreted relative to the initial permissions of
210 Do not enable soft-updates on the file system.
212 Specify the size of the disk to create.
213 This only makes sense if
219 this will work for the default swap-backed
228 Enable soft-updates on the file system.
229 This is the default, and is accepted only
231 It is only really useful to negate the
233 flag, should such a need occur.
235 Specify the UFS version number for use on the file system; it may be
240 The default is derived from the default of the
243 .It Fl w Ar user : Ns Ar group
244 Set the owner and group to
249 The arguments have the same semantics as with
251 but specifying just a
257 Print what command will be run before running it, and
258 other assorted debugging information.
265 options are passed to
273 .Fl a , b , c , d , e , f , i , m
276 options are passed to
278 with the same letter;
289 with the same letter.
290 See the programs that the options are passed to for more information
293 Create and mount a 32 megabyte swap-backed file system on
296 .Dl "mdmfs -s 32m md /tmp"
298 The same file system created as an entry in
301 .Dl "md /tmp mfs rw,-s32m 2 0"
303 Create and mount a 16 megabyte malloc-backed file system on
309 do not use soft-updates on it and mount it
312 .Dl "mdmfs -M -S -o async -s 16m md1 /tmp"
316 based compressed disk image:
318 .Dl "mdmfs -P -F foo.uzip -oro md.uzip /tmp/"
320 Mount the same image, specifying the
324 .Dl "mdmfs -P -F foo.uzip -oro md1.uzip /tmp/"
326 Configure a vnode-backed file system and mount its first partition,
327 using automatic device numbering:
329 .Dl "mdmfs -P -F foo.img mds1a /tmp/"
333 utility, while designed to be compatible with
335 can be useful by itself.
338 had some silly defaults, a
340 mode is provided for the case where bug-to-bug compatibility is desired.
342 Compatibility is enabled by starting
349 .Xr getprogname 3 ) .
350 In this mode, the following behavior, as done by
353 .Bl -bullet -offset indent
361 was given on the command line.