docs: filesystems: convert caching/object.txt to ReST

- 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@kernel.org>
Link: https://lore.kernel.org/r/49026a8ea7e714c2e0f003aa26b975b1025476b7.1588021877.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

diff --git a/Documentation/filesystems/caching/fscache.txt b/Documentation/filesystems/caching/fscache.txt
index 50f0a5757f48cb654f33130fcabc2db87f197a12..071ff50a774d944df931f232c0285ff7b0d42020 100644 (file)
--- 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 (file)
index 0000000..e5ec95f
--- /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 100ff41127e436ac8614c6c095a4e56dff2ccb62..ce0e043ccd33b182b72613b4561e28a2ee5a5fa7 100644 (file)
--- 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@redhat.com>
 
-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 e7b46dac70791efebdb114d512f2fd495f8df051..773af390c5e5124b0a4f644d32c1be44006800ea 100644 (file)
--- 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 cfeba839a0f2f1620ea4d726b5b847e54be84910..efaa003b8323fb9716e2f829abc6e64aeb308072 100644 (file)
--- 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@redhat.com)
  *
- * 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.
  */