1 .\" ----------------------------------------------------------------------------
2 .\" "THE BEER-WARE LICENSE" (Revision 42):
3 .\" <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
4 .\" can do whatever you want with this stuff. If we meet some day, and you think
5 .\" this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
6 .\" ----------------------------------------------------------------------------
21 driver provides support for four kinds of memory backed virtual disks:
22 .Bl -tag -width preload
24 Backing store is allocated using
26 Only one malloc-bucket is used, which means that all
30 backing must share the malloc-per-bucket-quota.
31 The exact size of this quota varies, in particular with the amount
34 The exact value can be determined with
41 is used for backing store.
42 For backwards compatibility the type
45 If the kernel is created with option
47 the first preloaded image found will become the root file system.
49 A regular file is used as backing store.
50 This allows for mounting ISO images without the tedious
51 detour over actual physical media.
53 Backing store is allocated from swap space.
56 For more information, please see
70 driver first appeared in
72 as a cleaner replacement
73 for the MFS functionality previously used in
81 driver did a hostile takeover of the