[PATCH v2 01/29] docs: filesystems: convert caching/object.txt to ReST

From: Mauro Carvalho Chehab
Date: Tue Apr 21 2020 - 12:54:59 EST

- Add a SPDX header;
- Adjust document and section titles;
- Comment out text ToC for html/pdf output;
- Some whitespace fixes and new line breaks;
- Adjust the events list to make them look better for html output;
- Add it to filesystems/index.rst.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
---
Documentation/filesystems/caching/fscache.txt | 2 +-
Documentation/filesystems/caching/index.rst | 9 ++++
.../caching/{object.txt => object.rst} | 43 ++++++++-----------
Documentation/filesystems/index.rst | 2 +
fs/fscache/object.c | 2 +-
5 files changed, 31 insertions(+), 27 deletions(-)
create mode 100644 Documentation/filesystems/caching/index.rst
rename Documentation/filesystems/caching/{object.txt => object.rst} (95%)

diff --git a/Documentation/filesystems/caching/fscache.txt b/Documentation/filesystems/caching/fscache.txt
index 50f0a5757f48..071ff50a774d 100644
--- a/Documentation/filesystems/caching/fscache.txt
+++ b/Documentation/filesystems/caching/fscache.txt
@@ -191,7 +191,7 @@ The cache backend API to FS-Cache can be found in:
A description of the internal representations and object state machine can be
found in:

- Documentation/filesystems/caching/object.txt
+ Documentation/filesystems/caching/object.rst


=======================
diff --git a/Documentation/filesystems/caching/index.rst b/Documentation/filesystems/caching/index.rst
new file mode 100644
index 000000000000..e5ec95ff0be2
--- /dev/null
+++ b/Documentation/filesystems/caching/index.rst
@@ -0,0 +1,9 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Filesystem Caching
+==================
+
+.. toctree::
+ :maxdepth: 2
+
+ object
diff --git a/Documentation/filesystems/caching/object.txt b/Documentation/filesystems/caching/object.rst
similarity index 95%
rename from Documentation/filesystems/caching/object.txt
rename to Documentation/filesystems/caching/object.rst
index 100ff41127e4..ce0e043ccd33 100644
--- a/Documentation/filesystems/caching/object.txt
+++ b/Documentation/filesystems/caching/object.rst
@@ -1,10 +1,12 @@
- ====================================================
- IN-KERNEL CACHE OBJECT REPRESENTATION AND MANAGEMENT
- ====================================================
+.. SPDX-License-Identifier: GPL-2.0
+
+====================================================
+In-Kernel Cache Object Representation and Management
+====================================================

By: David Howells <dhowells@xxxxxxxxxx>

-Contents:
+.. Contents:

(*) Representation

@@ -18,8 +20,7 @@ Contents:
(*) The set of events.


-==============
-REPRESENTATION
+Representation
==============

FS-Cache maintains an in-kernel representation of each object that a netfs is
@@ -38,7 +39,7 @@ or even by no objects (it may not be cached).

Furthermore, both cookies and objects are hierarchical. The two hierarchies
correspond, but the cookies tree is a superset of the union of the object trees
-of multiple caches:
+of multiple caches::

NETFS INDEX TREE : CACHE 1 : CACHE 2
: :
@@ -89,8 +90,7 @@ pointers to the cookies. The cookies themselves and any objects attached to
those cookies are hidden from it.


-===============================
-OBJECT MANAGEMENT STATE MACHINE
+Object Management State Machine
===============================

Within FS-Cache, each active object is managed by its own individual state
@@ -124,7 +124,7 @@ is not masked, the object will be queued for processing (by calling
fscache_enqueue_object()).


-PROVISION OF CPU TIME
+Provision of CPU Time
---------------------

The work to be done by the various states was given CPU time by the threads of
@@ -141,7 +141,7 @@ because:
workqueues don't necessarily have the right numbers of threads.


-LOCKING SIMPLIFICATION
+Locking Simplification
----------------------

Because only one worker thread may be operating on any particular object's
@@ -151,8 +151,7 @@ from the cache backend's representation (fscache_object) - which may be
requested from either end.


-=================
-THE SET OF STATES
+The Set of States
=================

The object state machine has a set of states that it can be in. There are
@@ -275,19 +274,17 @@ memory and potentially deletes stuff from disk:
this state.


-THE SET OF EVENTS
+The Set of Events
-----------------

There are a number of events that can be raised to an object state machine:

- (*) FSCACHE_OBJECT_EV_UPDATE
-
+ FSCACHE_OBJECT_EV_UPDATE
The netfs requested that an object be updated. The state machine will ask
the cache backend to update the object, and the cache backend will ask the
netfs for details of the change through its cookie definition ops.

- (*) FSCACHE_OBJECT_EV_CLEARED
-
+ FSCACHE_OBJECT_EV_CLEARED
This is signalled in two circumstances:

(a) when an object's last child object is dropped and
@@ -296,20 +293,16 @@ There are a number of events that can be raised to an object state machine:

This is used to proceed from the dying state.

- (*) FSCACHE_OBJECT_EV_ERROR
-
+ FSCACHE_OBJECT_EV_ERROR
This is signalled when an I/O error occurs during the processing of some
object.

- (*) FSCACHE_OBJECT_EV_RELEASE
- (*) FSCACHE_OBJECT_EV_RETIRE
-
+ FSCACHE_OBJECT_EV_RELEASE, FSCACHE_OBJECT_EV_RETIRE
These are signalled when the netfs relinquishes a cookie it was using.
The event selected depends on whether the netfs asks for the backing
object to be retired (deleted) or retained.

- (*) FSCACHE_OBJECT_EV_WITHDRAW
-
+ FSCACHE_OBJECT_EV_WITHDRAW
This is signalled when the cache backend wants to withdraw an object.
This means that the object will have to be detached from the netfs's
cookie.
diff --git a/Documentation/filesystems/index.rst b/Documentation/filesystems/index.rst
index 0641429f53a2..f8781c13aee3 100644
--- a/Documentation/filesystems/index.rst
+++ b/Documentation/filesystems/index.rst
@@ -25,6 +25,8 @@ algorithms work.
locking
directory-locking

+ caching/index
+
porting

Filesystem support layers
diff --git a/fs/fscache/object.c b/fs/fscache/object.c
index cfeba839a0f2..efaa003b8323 100644
--- a/fs/fscache/object.c
+++ b/fs/fscache/object.c
@@ -4,7 +4,7 @@
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@xxxxxxxxxx)
*
- * See Documentation/filesystems/caching/object.txt for a description of the
+ * See Documentation/filesystems/caching/object.rst for a description of the
* object state machine and the in-kernel representations.
*/

--
2.25.2