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docs: filesystems: convert 9p.txt to ReST

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

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/96a060b7b5c0c3838ab1751addfe4d6d3bc37bd6.1581955849.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Mauro Carvalho Chehab 2020-02-17 17:11:47 +01:00 committed by Jonathan Corbet
parent 3eb30c51a6
commit 07d241fd66
2 changed files with 75 additions and 50 deletions
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124
Documentation/filesystems/9p.txt → Documentation/filesystems/9p.rst
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@ -1,7 +1,10 @@
v9fs: Plan 9 Resource Sharing for Linux
=======================================
.. SPDX-License-Identifier: GPL-2.0
ABOUT
=======================================
v9fs: Plan 9 Resource Sharing for Linux
=======================================
About
=====
v9fs is a Unix implementation of the Plan 9 9p remote filesystem protocol.
@ -14,32 +17,34 @@ and Maya Gokhale. Additional development by Greg Watson
The best detailed explanation of the Linux implementation and applications of
the 9p client is available in the form of a USENIX paper:
http://www.usenix.org/events/usenix05/tech/freenix/hensbergen.html
Other applications are described in the following papers:
* XCPU & Clustering
http://xcpu.org/papers/xcpu-talk.pdf
* KVMFS: control file system for KVM
http://xcpu.org/papers/kvmfs.pdf
* CellFS: A New Programming Model for the Cell BE
http://xcpu.org/papers/cellfs-talk.pdf
* PROSE I/O: Using 9p to enable Application Partitions
http://plan9.escet.urjc.es/iwp9/cready/PROSE_iwp9_2006.pdf
* VirtFS: A Virtualization Aware File System pass-through
http://goo.gl/3WPDg
USAGE
* XCPU & Clustering
http://xcpu.org/papers/xcpu-talk.pdf
* KVMFS: control file system for KVM
http://xcpu.org/papers/kvmfs.pdf
* CellFS: A New Programming Model for the Cell BE
http://xcpu.org/papers/cellfs-talk.pdf
* PROSE I/O: Using 9p to enable Application Partitions
http://plan9.escet.urjc.es/iwp9/cready/PROSE_iwp9_2006.pdf
* VirtFS: A Virtualization Aware File System pass-through
http://goo.gl/3WPDg
Usage
=====
For remote file server:
For remote file server::
mount -t 9p 10.10.1.2 /mnt/9
For Plan 9 From User Space applications (http://swtch.com/plan9)
For Plan 9 From User Space applications (http://swtch.com/plan9)::
mount -t 9p `namespace`/acme /mnt/9 -o trans=unix,uname=$USER
For server running on QEMU host with virtio transport:
For server running on QEMU host with virtio transport::
mount -t 9p -o trans=virtio <mount_tag> /mnt/9
@ -48,18 +53,22 @@ mount points. Each 9P export is seen by the client as a virtio device with an
associated "mount_tag" property. Available mount tags can be
seen by reading /sys/bus/virtio/drivers/9pnet_virtio/virtio<n>/mount_tag files.
OPTIONS
Options
=======
============= ===============================================================
trans=name select an alternative transport. Valid options are
currently:
unix - specifying a named pipe mount point
tcp - specifying a normal TCP/IP connection
fd - used passed file descriptors for connection
(see rfdno and wfdno)
virtio - connect to the next virtio channel available
(from QEMU with trans_virtio module)
rdma - connect to a specified RDMA channel
======== ============================================
unix specifying a named pipe mount point
tcp specifying a normal TCP/IP connection
fd used passed file descriptors for connection
(see rfdno and wfdno)
virtio connect to the next virtio channel available
(from QEMU with trans_virtio module)
rdma connect to a specified RDMA channel
======== ============================================
uname=name user name to attempt mount as on the remote server. The
server may override or ignore this value. Certain user
@ -69,28 +78,36 @@ OPTIONS
offering several exported file systems.
cache=mode specifies a caching policy. By default, no caches are used.
none = default no cache policy, metadata and data
none
default no cache policy, metadata and data
alike are synchronous.
loose = no attempts are made at consistency,
loose
no attempts are made at consistency,
intended for exclusive, read-only mounts
fscache = use FS-Cache for a persistent, read-only
fscache
use FS-Cache for a persistent, read-only
cache backend.
mmap = minimal cache that is only used for read-write
mmap
minimal cache that is only used for read-write
mmap. Northing else is cached, like cache=none
debug=n specifies debug level. The debug level is a bitmask.
0x01 = display verbose error messages
0x02 = developer debug (DEBUG_CURRENT)
0x04 = display 9p trace
0x08 = display VFS trace
0x10 = display Marshalling debug
0x20 = display RPC debug
0x40 = display transport debug
0x80 = display allocation debug
0x100 = display protocol message debug
0x200 = display Fid debug
0x400 = display packet debug
0x800 = display fscache tracing debug
===== ================================
0x01 display verbose error messages
0x02 developer debug (DEBUG_CURRENT)
0x04 display 9p trace
0x08 display VFS trace
0x10 display Marshalling debug
0x20 display RPC debug
0x40 display transport debug
0x80 display allocation debug
0x100 display protocol message debug
0x200 display Fid debug
0x400 display packet debug
0x800 display fscache tracing debug
===== ================================
rfdno=n the file descriptor for reading with trans=fd
@ -103,9 +120,12 @@ OPTIONS
noextend force legacy mode (no 9p2000.u or 9p2000.L semantics)
version=name Select 9P protocol version. Valid options are:
9p2000 - Legacy mode (same as noextend)
9p2000.u - Use 9P2000.u protocol
9p2000.L - Use 9P2000.L protocol
======== ==============================
9p2000 Legacy mode (same as noextend)
9p2000.u Use 9P2000.u protocol
9p2000.L Use 9P2000.L protocol
======== ==============================
dfltuid attempt to mount as a particular uid
@ -118,22 +138,27 @@ OPTIONS
hosts. This functionality will be expanded in later versions.
access there are four access modes.
user = if a user tries to access a file on v9fs
user
if a user tries to access a file on v9fs
filesystem for the first time, v9fs sends an
attach command (Tattach) for that user.
This is the default mode.
<uid> = allows only user with uid=<uid> to access
<uid>
allows only user with uid=<uid> to access
the files on the mounted filesystem
any = v9fs does single attach and performs all
any
v9fs does single attach and performs all
operations as one user
client = ACL based access check on the 9p client
clien
ACL based access check on the 9p client
side for access validation
cachetag cache tag to use the specified persistent cache.
cache tags for existing cache sessions can be listed at
/sys/fs/9p/caches. (applies only to cache=fscache)
============= ===============================================================
RESOURCES
Resources
=========
Protocol specifications are maintained on github:
@ -158,4 +183,3 @@ http://plan9.bell-labs.com/plan9
For information on Plan 9 from User Space (Plan 9 applications and libraries
ported to Linux/BSD/OSX/etc) check out http://swtch.com/plan9

1
Documentation/filesystems/index.rst
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@ -46,6 +46,7 @@ Documentation for filesystem implementations.
.. toctree::
:maxdepth: 2
9p
autofs
fuse
overlayfs