code: 9ferno

ref: 600bbfe4aaa9ad0f73d8d73eef1b7670e5f7d3a3
dir: /man/4/memfs/

View raw version
.TH MEMFS 4
.SH NAME
memfs \- mount a heap based filesystem
.SH SYNOPSIS
.B memfs
.RB [ \-s ]
.RB [ \-rab ]
.RB [ \-m
.IR size ]
.RI [ mountpoint ]
.SH DESCRIPTION
.I Memfs
mounts a newly created heap-based filesystem
on the given
.I mountpoint
directory (default
.BR /tmp ).
.PP
The filesystem is entirely maintained in memory, no external storage is used.
File data is allocated in 512 byte blocks.
If a maximum
.I size
is specified, the actual maximum is rounded down to the nearest
whole number of blocks:
.IP
.EX
actualsize := (size / 512) * 512;
.EE
.PP
The root of the filesystem is owned by the user who invoked memfs and
is created with Read, Write and Execute permissions for the owner and Read and Execute
permissions for everyone else (8r755).
.PP
.SH OPTIONS
.TP
.B \-s
Serve styx on file descriptor 0.
The
.I mountpoint
and other mount options are ignored.
.TP
.B \-r
The default option.
The old
.I mountpoint
directory becomes a union directory consisting of just the root of the new filesystem.
.TP
.B \-a
Add the root of the new filesystem to the end of the union directory
represented by the
.I mountpoint
directory.
.TP
.B \-b
Add the root of the new filesystem to the beginning of the union directory
represented by the
.I mountpoint
directory.
.SH SOURCE
.B /appl/cmd/memfs.b
.SH SEE ALSO
.IR ramfile (4)