178 lines
3.6 KiB
Text
178 lines
3.6 KiB
Text
.TH DOSSRV 4
|
|
.SH NAME
|
|
dossrv, 9660srv, dosmnt, eject \- DOS and ISO9660 file systems
|
|
.SH SYNOPSIS
|
|
.B dossrv
|
|
[
|
|
.B -rsv
|
|
] [
|
|
.B -f
|
|
.I file
|
|
] [
|
|
.I service
|
|
]
|
|
.PP
|
|
.B 9660srv
|
|
[
|
|
.B -9Jsv
|
|
] [
|
|
.B -c
|
|
.I clusters
|
|
] [
|
|
.B -f
|
|
.I file
|
|
] [
|
|
.I service
|
|
]
|
|
.PP
|
|
.B dosmnt
|
|
.I n
|
|
.I mtpt
|
|
.PP
|
|
.B eject
|
|
[
|
|
.I n
|
|
]
|
|
.SH DESCRIPTION
|
|
.I Dossrv
|
|
is a file server that interprets DOS file systems.
|
|
A single instance of
|
|
.I dossrv
|
|
can provide access to multiple DOS disks simultaneously.
|
|
.PP
|
|
.I Dossrv
|
|
posts a file descriptor named
|
|
.I service
|
|
(default
|
|
.BR dos )
|
|
in the
|
|
.B /srv
|
|
directory.
|
|
To access the DOS file system on a device, use
|
|
.B mount
|
|
with the
|
|
.I spec
|
|
argument
|
|
(see
|
|
.IR bind (1))
|
|
the name of the file holding raw DOS file system, typically the disk.
|
|
If
|
|
.I spec
|
|
is undefined in the
|
|
.BR mount ,
|
|
.I dossrv
|
|
will use
|
|
.I file
|
|
as the default name for the device holding the DOS system.
|
|
.PP
|
|
Normally
|
|
.I dossrv
|
|
creates a pipe to act as the communications channel between
|
|
itself and its clients.
|
|
The
|
|
.B -s
|
|
flag instructs
|
|
.I dossrv
|
|
to use its standard input and output instead.
|
|
The kernels use this option if they are booting from a DOS disk.
|
|
This flag also prevents the creation of an explicit service file in
|
|
.BR /srv .
|
|
.PP
|
|
The
|
|
.B -v
|
|
flag causes verbose output for debugging, while
|
|
the
|
|
.B -r
|
|
flag makes the file system read-only.
|
|
.PP
|
|
The file attribute flags used by the DOS file system
|
|
do not map directly to those used by Plan 9.
|
|
Since there is no concept of user or group,
|
|
permission changes via
|
|
.B wstat
|
|
(see
|
|
.IR stat (2))
|
|
will fail unless the same (read, write, execute) permissions
|
|
are specified for user, group, and other.
|
|
For example, removing write permission in Plan 9
|
|
corresponds to setting the read-only
|
|
attribute in the DOS file system.
|
|
Most of the other DOS attributes
|
|
are not accessible.
|
|
.PP
|
|
Setting the exclusive use flag (DMEXCL)
|
|
in Plan 9 corresponds to setting the
|
|
system use attribute in the DOS file system.
|
|
Such files are not actually restricted to exclusive use,
|
|
but do merit special treatment that
|
|
helps in the creation of boot disks:
|
|
when
|
|
.I dossrv
|
|
allocates a new block for such a file
|
|
(caused, say, by a write that fills the file's
|
|
last allocated block), it succeeds only if it can
|
|
arrange for the file to be stored
|
|
contiguously on disk.
|
|
.PP
|
|
Since other operating systems do not
|
|
guarantee that system files are laid
|
|
out contiguously, the DMAPPEND mode
|
|
bit is set in file stat information
|
|
only when the file is currently contiguous.
|
|
Attempts to set the DMAPPEND mode bit
|
|
explicitly will cause
|
|
.I dossrv
|
|
to try to make the file contiguous,
|
|
succeeding only if this is possible.
|
|
.PP
|
|
.I 9660srv
|
|
is similar to
|
|
.I dossrv
|
|
in specification, except that it interprets ISO9660 CD-ROM
|
|
file systems instead of DOS file systems.
|
|
Some CDs contain multiple directory trees describing
|
|
the same set of files.
|
|
.IR 9660srv 's
|
|
first choice in such a case is a standard ISO9660 tree
|
|
with Plan 9 system use fields;
|
|
the second choice is a Microsoft ``Joliet'' tree, which
|
|
allows long file names and Unicode characters;
|
|
the third choice is a standard ISO9660 or High Sierra tree.
|
|
The
|
|
.B -9
|
|
flag causes
|
|
.I 9660srv
|
|
to ignore the Plan 9 system use fields,
|
|
while the
|
|
.B -J
|
|
flag causes it to
|
|
ignore the Joliet tree.
|
|
The
|
|
.B -c
|
|
option sets the size of the RAM cache to
|
|
.I clusters
|
|
clusters of 128KB.
|
|
The default
|
|
.I clusters
|
|
is 16,
|
|
but a value of 5600 will cache an entire CD incrementally.
|
|
.PP
|
|
If the floppy drive has an ejection motor,
|
|
.I eject
|
|
will spit out the floppy from drive
|
|
.IR n ,
|
|
default 0.
|
|
.SH "SEE ALSO"
|
|
.IR kfs (4)
|
|
.SH SOURCE
|
|
.B /sys/src/cmd/dossrv
|
|
.br
|
|
.B /sys/src/cmd/9660srv
|
|
.br
|
|
.B /rc/bin/eject
|
|
.br
|
|
.B /rc/bin/dosmnt
|
|
.SH BUGS
|
|
The overloading of the semantics of
|
|
the DMEXCL and DMAPPEND
|
|
bits can be confusing.
|