mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-13 07:44:00 +08:00
docs: filesystems: convert devpts.txt to ReST
- Add a SPDX header; - Add a 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/4ac8f3a7edd4d817acf0d173ead7ef74fe010c6c.1588021877.git.mchehab+huawei@kernel.org Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
parent
f476c6ed17
commit
01478b8331
@ -895,7 +895,7 @@ this sysctl interface anymore.
|
||||
pty
|
||||
===
|
||||
|
||||
See Documentation/filesystems/devpts.txt.
|
||||
See Documentation/filesystems/devpts.rst.
|
||||
|
||||
|
||||
randomize_va_space
|
||||
|
36
Documentation/filesystems/devpts.rst
Normal file
36
Documentation/filesystems/devpts.rst
Normal file
@ -0,0 +1,36 @@
|
||||
.. SPDX-License-Identifier: GPL-2.0
|
||||
|
||||
=====================
|
||||
The Devpts Filesystem
|
||||
=====================
|
||||
|
||||
Each mount of the devpts filesystem is now distinct such that ptys
|
||||
and their indicies allocated in one mount are independent from ptys
|
||||
and their indicies in all other mounts.
|
||||
|
||||
All mounts of the devpts filesystem now create a ``/dev/pts/ptmx`` node
|
||||
with permissions ``0000``.
|
||||
|
||||
To retain backwards compatibility the a ptmx device node (aka any node
|
||||
created with ``mknod name c 5 2``) when opened will look for an instance
|
||||
of devpts under the name ``pts`` in the same directory as the ptmx device
|
||||
node.
|
||||
|
||||
As an option instead of placing a ``/dev/ptmx`` device node at ``/dev/ptmx``
|
||||
it is possible to place a symlink to ``/dev/pts/ptmx`` at ``/dev/ptmx`` or
|
||||
to bind mount ``/dev/ptx/ptmx`` to ``/dev/ptmx``. If you opt for using
|
||||
the devpts filesystem in this manner devpts should be mounted with
|
||||
the ``ptmxmode=0666``, or ``chmod 0666 /dev/pts/ptmx`` should be called.
|
||||
|
||||
Total count of pty pairs in all instances is limited by sysctls::
|
||||
|
||||
kernel.pty.max = 4096 - global limit
|
||||
kernel.pty.reserve = 1024 - reserved for filesystems mounted from the initial mount namespace
|
||||
kernel.pty.nr - current count of ptys
|
||||
|
||||
Per-instance limit could be set by adding mount option ``max=<count>``.
|
||||
|
||||
This feature was added in kernel 3.4 together with
|
||||
``sysctl kernel.pty.reserve``.
|
||||
|
||||
In kernels older than 3.4 sysctl ``kernel.pty.max`` works as per-instance limit.
|
@ -1,26 +0,0 @@
|
||||
Each mount of the devpts filesystem is now distinct such that ptys
|
||||
and their indicies allocated in one mount are independent from ptys
|
||||
and their indicies in all other mounts.
|
||||
|
||||
All mounts of the devpts filesystem now create a /dev/pts/ptmx node
|
||||
with permissions 0000.
|
||||
|
||||
To retain backwards compatibility the a ptmx device node (aka any node
|
||||
created with "mknod name c 5 2") when opened will look for an instance
|
||||
of devpts under the name "pts" in the same directory as the ptmx device
|
||||
node.
|
||||
|
||||
As an option instead of placing a /dev/ptmx device node at /dev/ptmx
|
||||
it is possible to place a symlink to /dev/pts/ptmx at /dev/ptmx or
|
||||
to bind mount /dev/ptx/ptmx to /dev/ptmx. If you opt for using
|
||||
the devpts filesystem in this manner devpts should be mounted with
|
||||
the ptmxmode=0666, or chmod 0666 /dev/pts/ptmx should be called.
|
||||
|
||||
Total count of pty pairs in all instances is limited by sysctls:
|
||||
kernel.pty.max = 4096 - global limit
|
||||
kernel.pty.reserve = 1024 - reserved for filesystems mounted from the initial mount namespace
|
||||
kernel.pty.nr - current count of ptys
|
||||
|
||||
Per-instance limit could be set by adding mount option "max=<count>".
|
||||
This feature was added in kernel 3.4 together with sysctl kernel.pty.reserve.
|
||||
In kernels older than 3.4 sysctl kernel.pty.max works as per-instance limit.
|
@ -24,6 +24,7 @@ algorithms work.
|
||||
splice
|
||||
locking
|
||||
directory-locking
|
||||
devpts
|
||||
|
||||
automount-support
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user