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Add padding space and a version number to the md_ioctl structre for future

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extension.

Add ability to create a preload disk giving an address and a length
(suggested by imp)

Fix bug relating to very small md(4) devices.

Update md.c copyright to reflect the status of code copied from vn.c.
(noticed by dillon)
This commit is contained in:
Poul-Henning Kamp 2001-01-01 23:08:26 +00:00
parent b5073b49d9
commit e06b153abe
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=70573
3 changed files with 25 additions and 5 deletions
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19
sbin/mdconfig/mdconfig.8
View File

@ -52,6 +52,7 @@
.Fl a
.Fl t Ar type
.Op Fl o Ar [no]option
.Op Fl b Ar baseaddress
.Op Fl s Ar size
.Op Fl f Ar file
.Op Fl u Ar unit
@ -80,8 +81,8 @@ Storage for this type of memory disk is allocated with
.Xr malloc 9 .
This limits the size to the malloc bucket limit in the kernel.
.It Ar preload
This type represents memory disks which were instantiated by objects loaded
by the bootloader. They can not be created on the fly.
This type represents memory disks which are backed by memory outside the kernels normal address space.
These can be instantiated automatically by objects loaded by the bootloader or configured on the fly.
.It Ar vnode
A file specified with
.Fl f Ar file
@ -89,6 +90,8 @@ becomes the backingstore for this memory disk.
.It Ar swap
swapspace is used to back this memory disk.
.El
.It Fl b Ar baseaddress
Starting address in kernel virtual space of the memory to be used for a ``preload'' type disk.
.It Fl f Ar file
Filename to use for the vnode type memory disk.
.It Fl s Ar size
@ -108,7 +111,13 @@ Automatically allocate the next free unit number for this disk.
The basename of the disk is printed on stdout.
.It Ar [no]compress
Enable/Disable compression features to reduce memory usage.
.It Ar [no]readonly
Enable/Disable readonly mode.
.El
.It Fl u Ar unit
Force the
.Xr md(4)
device to use a specific unit number.
.El
.Sh EXAMPLES
.Pp
@ -138,6 +147,12 @@ To create and mount a 128MByte swap backed filesystem on
.Dl newfs -f 4096 /dev/md10c
.Dl tunefs -n enable /dev/md10c
.Dl mount /dev/md10c /tmp
.Pp
It is practically impossible to give a universal example of the ``preload'' type of disk,
it is mainly useful in the embedded systems market, but to give a feel for how it works:
On most standard PC architecture machines this will create a disk backed by the BIOS ROM:
.Pp
.Dl mdconfig -a -t preload -s 128k -b 0xc00fe000
.Sh SEE ALSO
.Xr md 4 ,
.Xr disklabel 8 ,

2
sbin/mdconfig/mdconfig.c
View File

@ -44,7 +44,7 @@ main(int argc, char **argv)
int cmdline = 0;
for (;;) {
ch = getopt(argc, argv, "adf:o:s:t:u:");
ch = getopt(argc, argv, "ab:df:o:s:t:u:");
if (ch == -1)
break;
switch (ch) {

9
sys/sys/mdioctl.h
View File

@ -54,13 +54,18 @@ enum md_types {MD_MALLOC, MD_PRELOAD, MD_VNODE, MD_SWAP};
*/
struct md_ioctl {
unsigned md_version; /* Structure layout version */
unsigned md_unit; /* unit number */
enum md_types md_type ; /* type of disk */
char md_file[MAXPATHLEN + 1]; /* pathname of file to mount */
unsigned md_size; /* (returned) size of disk */
char *md_file; /* pathname of file to mount */
unsigned md_size; /* size of disk in DEV_BSIZE units */
unsigned md_options; /* options */
u_int64_t md_base; /* base address */
int pad[100]; /* padding for future ideas */
};
#define MDIOVERSION 1
/*
* Before you can use a unit, it must be configured with MDIOCSET.
* The configuration persists across opens and closes of the device;