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docs: filesystems: convert cifs/cifsroot.txt to ReST

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- Add a SPDX header;
- Adjust document title;
- Some whitespace fixes and new line breaks;
- Mark literal blocks as such;
- Add it to filesystems/index.rst.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/28de01ee52283287e4195cf736d7154f122d30d4.1588021877.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Mauro Carvalho Chehab 2020-04-27 23:16:59 +02:00 committed by Jonathan Corbet
parent 0e822145b5
commit 175cc46f4d
2 changed files with 33 additions and 24 deletions
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56
Documentation/filesystems/cifs/cifsroot.txt → Documentation/filesystems/cifs/cifsroot.rst
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@ -1,7 +1,11 @@
.. SPDX-License-Identifier: GPL-2.0
===========================================
Mounting root file system via SMB (cifs.ko)
===========================================
Written 2019 by Paulo Alcantara <palcantara@suse.de>
Written 2019 by Aurelien Aptel <aaptel@suse.com>
The CONFIG_CIFS_ROOT option enables experimental root file system
@ -32,7 +36,7 @@ Server configuration
====================
To enable SMB1+UNIX extensions you will need to set these global
settings in Samba smb.conf:
settings in Samba smb.conf::
[global]
server min protocol = NT1
@ -41,12 +45,16 @@ settings in Samba smb.conf:
Kernel command line
===================
root=/dev/cifs
::
root=/dev/cifs
This is just a virtual device that basically tells the kernel to mount
the root file system via SMB protocol.
cifsroot=//<server-ip>/<share>[,options]
::
cifsroot=//<server-ip>/<share>[,options]
Enables the kernel to mount the root file system via SMB that are
located in the <server-ip> and <share> specified in this option.
@ -65,33 +73,33 @@ options
Examples
========
Export root file system as a Samba share in smb.conf file.
Export root file system as a Samba share in smb.conf file::
...
[linux]
path = /path/to/rootfs
read only = no
guest ok = yes
force user = root
force group = root
browseable = yes
writeable = yes
admin users = root
public = yes
create mask = 0777
directory mask = 0777
...
...
[linux]
path = /path/to/rootfs
read only = no
guest ok = yes
force user = root
force group = root
browseable = yes
writeable = yes
admin users = root
public = yes
create mask = 0777
directory mask = 0777
...
Restart smb service.
Restart smb service::
# systemctl restart smb
# systemctl restart smb
Test it under QEMU on a kernel built with CONFIG_CIFS_ROOT and
CONFIG_IP_PNP options enabled.
CONFIG_IP_PNP options enabled::
# qemu-system-x86_64 -enable-kvm -cpu host -m 1024 \
-kernel /path/to/linux/arch/x86/boot/bzImage -nographic \
-append "root=/dev/cifs rw ip=dhcp cifsroot=//10.0.2.2/linux,username=foo,password=bar console=ttyS0 3"
# qemu-system-x86_64 -enable-kvm -cpu host -m 1024 \
-kernel /path/to/linux/arch/x86/boot/bzImage -nographic \
-append "root=/dev/cifs rw ip=dhcp cifsroot=//10.0.2.2/linux,username=foo,password=bar console=ttyS0 3"
1: https://wiki.samba.org/index.php/UNIX_Extensions

1
Documentation/filesystems/index.rst
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@ -59,6 +59,7 @@ Documentation for filesystem implementations.
befs
bfs
btrfs
cifs/cifsroot
ceph
cramfs
debugfs