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Date: Mon, 27 Apr 2020 23:17:18 +0200 From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org> To: Linux Doc Mailing List <linux-doc@...r.kernel.org> Cc: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>, linux-kernel@...r.kernel.org, Jonathan Corbet <corbet@....net> Subject: [PATCH v3 26/29] docs: filesystems: convert sysfs-tagging.txt to ReST - 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@...nel.org> --- Documentation/filesystems/index.rst | 1 + .../{sysfs-tagging.txt => sysfs-tagging.rst} | 22 ++++++++++++------- 2 files changed, 15 insertions(+), 8 deletions(-) rename Documentation/filesystems/{sysfs-tagging.txt => sysfs-tagging.rst} (72%) diff --git a/Documentation/filesystems/index.rst b/Documentation/filesystems/index.rst index 59b781c8ea80..eda20dd4657e 100644 --- a/Documentation/filesystems/index.rst +++ b/Documentation/filesystems/index.rst @@ -35,6 +35,7 @@ algorithms work. seq_file sharedsubtree sysfs-pci + sysfs-tagging automount-support diff --git a/Documentation/filesystems/sysfs-tagging.txt b/Documentation/filesystems/sysfs-tagging.rst similarity index 72% rename from Documentation/filesystems/sysfs-tagging.txt rename to Documentation/filesystems/sysfs-tagging.rst index c7c8e6438958..8888a05c398e 100644 --- a/Documentation/filesystems/sysfs-tagging.txt +++ b/Documentation/filesystems/sysfs-tagging.rst @@ -1,5 +1,8 @@ +.. SPDX-License-Identifier: GPL-2.0 + +============= Sysfs tagging -------------- +============= (Taken almost verbatim from Eric Biederman's netns tagging patch commit msg) @@ -18,25 +21,28 @@ in the directories and applications only see a limited set of the network devices. Each sysfs directory entry may be tagged with a namespace via the -void *ns member of its kernfs_node. If a directory entry is tagged, -then kernfs_node->flags will have a flag between KOBJ_NS_TYPE_NONE +``void *ns member`` of its ``kernfs_node``. If a directory entry is tagged, +then ``kernfs_node->flags`` will have a flag between KOBJ_NS_TYPE_NONE and KOBJ_NS_TYPES, and ns will point to the namespace to which it belongs. -Each sysfs superblock's kernfs_super_info contains an array void -*ns[KOBJ_NS_TYPES]. When a task in a tagging namespace +Each sysfs superblock's kernfs_super_info contains an array +``void *ns[KOBJ_NS_TYPES]``. When a task in a tagging namespace kobj_nstype first mounts sysfs, a new superblock is created. It will be differentiated from other sysfs mounts by having its -s_fs_info->ns[kobj_nstype] set to the new namespace. Note that +``s_fs_info->ns[kobj_nstype]`` set to the new namespace. Note that through bind mounting and mounts propagation, a task can easily view the contents of other namespaces' sysfs mounts. Therefore, when a namespace exits, it will call kobj_ns_exit() to invalidate any kernfs_node->ns pointers pointing to it. Users of this interface: -- define a type in the kobj_ns_type enumeration. -- call kobj_ns_type_register() with its kobj_ns_type_operations which has + +- define a type in the ``kobj_ns_type`` enumeration. +- call kobj_ns_type_register() with its ``kobj_ns_type_operations`` which has + - current_ns() which returns current's namespace - netlink_ns() which returns a socket's namespace - initial_ns() which returns the initial namesapce + - call kobj_ns_exit() when an individual tag is no longer valid -- 2.25.4
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