MEMFS(4)
NAME
memfs − mount a heap based filesystem
SYNOPSIS
memfs [−rab] [size] mountpoint
DESCRIPTION
Memfs mounts a newly created heap-based filesystem on the given mountpoint directory.
The filesystem is entirely maintained in memory, no external storage is used. Unless specified by size, the maximum storage provided by the filesystem is 1 megabyte (1024*1024 bytes). File data is allocated in 512 byte blocks. If a maximum size is specified, the actual maximum is rounded down to the nearest whole number of blocks:
actualsize := (size / 512) * 512;
The root of the new filesystem is created with Read, Write and Execute permission for the user only (mode 8r700). The owner is given by the value returned from /dev/user at the time of running the command.
Memfs has the following options:
−r The default option. The old mountpoint directory becomes a union directory consisting of just the root of the new filesystem.
−a Add the root of the new filesystem to the end of the union directory represented by the mountpoint directory.
−b Add the root of the new filesystem to the beginning of the union directory represented by the mountpoint directory.
FILES
/dev/user
read to name the owner of the filesystem
/dev/time
used to set file creation and modify times
SOURCE
/appl/cmd/memfs.b