ref: 56bd332994102b4e194819abb5e087a8895452f9
dir: /man/mafs.4/
.TH MAFS 4
.SH NAME
mafs,
mfs - disk file system servers
.SH SYNOPSIS
.B disk/mafs
[
.B -Ds
] [
.B -n
.I service
] [
.B -r
.I service
] [
.B -m
.I nmemunits
] [
.B -h
.I nbuckets
] [
.B -w
.I npendingwrites
]
.B file
.PP
.B disk/mfs
[
.B -Ds
] [
.B -n
.I service
] [
.B -r
.I service
] [
.B -m
.I nmemunits
] [
.B -h
.I nbuckets
]
.B file
.SH DESCRIPTION
.I Mfs
and
.I Mafs
are user space file servers that run on a single partition.
.PP
The options are:
.TF "n name"
.TP
.I file
Use
.I file
as the disk.
.TP
.BI "-n " service
Use
.I service
as the name of the service instead of the
.I service
provide with -r, just for this run. mafs posts the file /srv/service that can be used to mount this filesystem.
.TP
.BI "-r " service
Ream the file system, erasing all of the old data. Use
.I service
as the name of the service. mafs posts the file /srv/service that can be used to mount this filesystem.
.TP
.B -s
Read and write protocol messages on standard file descriptors zero and one.
.TP
.BI "-m " nmemunits
Allocate
.I nbuckets
hash buckets to use for Iobuf cache. Each bucket links into a least recently used circular linked list of Iobuf's.
.TP
.BI "-h " nbuckets
Allocate
.I nbuckets
hash buckets to use for Iobuf cache. Each bucket links into a least recently used circular linked list of Iobuf's.
.TP
.BI "-w " npendingwrites
Allocate
.I nbuckets
hash buckets to use for Iobuf cache. Each bucket links into a least recently used circular linked list of Iobuf's.
.TP
.BI "-a " announce-string
will announce and listen on the specified network address.
.PD
.SH EXAMPLES
Ream and start single process M[a]fs on a disk and also mount it for use.
.IP
.EX
mount -c \\
<{disk/mafs -s -r mafs_myservice mydisk <[0=1]} \\
/n/mafs_myservice
.EE
.PP
Ream and start multiple-process mafs on a disk.
.IP
.EX
disk/mafs -r mafs_myservice mydisk
mount -c /srv/mafs_myservice /n/mafs_myservice
.EE
.PP
Ream and start mafs on a file. Also, mount thet filesystem at /n/mafs_myservice.
.IP
.EX
dd -if /dev/zero -of myfile -bs 512 -count 128 # 64KB file
mount -c \\
<{disk/mafs -s -r mafs_service myfile <[0=1]} \\
/n/mafs_myservice
# to reuse the contents of myfile later, remove -r (ream).
mount -c <{disk/mafs -s myfile <[0=1]} /n/mafs_myservice
.EE
.PP
Prepare and use a disk (/dev/sdF1) for mafs.
.IP
.EX
disk/fdisk -bawp /dev/sdF1/data # partition the disk
# add an fs plan 9 partition to the disk
echo '
a fs 9 $-7
w
p
q' | disk/prep -b /dev/sdF1/plan9
disk/mafs -r mafs_sdF1 /dev/sdF1/fs # -r to ream the disk
mount -c /srv/mafs_sdF1 /n/mafs_sdF1
# for using the mafs file system on the disk later on
disk/mafs /dev/sdF1/fs # no -r
mount -c /srv/mafs_sdF1 /n/mafs_sdF1
.EE
.PP
Starting mafs on a RAM file. The below commands create a ramfs filesystem to use as a disk.
.IP
.EX
ramfs -m /n/mafs_ramfs
touch /n/mafs_ramfs/file
dd -if /dev/zero -of /n/mafs_ramfs/file -count 700 -bs 1m
disk/mafs -r mafs_ramfs_file /n/mafs_ramfs/file
mount -c /srv/mafs_ramfs_file /n/mafs_ramfs_file
.EE
.SH SOURCE
.B /sys/src/cmd/mafs
.SH "SEE ALSO"
.IR mafs (8),
.IR prep (8),
.IR sd (3)
.br
M[a]fs - Plan 9 userspace file system