author | Dominic Pinkman <dominic.pinkman@nokia.com> |
Fri, 16 Jul 2010 17:23:46 +0100 | |
changeset 12 | 80ef3a206772 |
parent 9 | 59758314f811 |
child 14 | 578be2adaf3e |
permissions | -rw-r--r-- |
9
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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<?xml version="1.0" encoding="utf-8"?> |
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
59758314f811
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<!-- This component and the accompanying materials are made available under the terms of the License |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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"Eclipse Public License v1.0" which accompanies this distribution, |
59758314f811
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
59758314f811
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<!-- Initial Contributors: |
59758314f811
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Nokia Corporation - initial contribution. |
59758314f811
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Contributors: |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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--> |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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<!DOCTYPE concept |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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<concept id="GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6" xml:lang="en"><title>File Server |
59758314f811
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Plugin Concepts</title><shortdesc>This topic describes the file server plug-in concepts.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
59758314f811
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<p>File server plugins can issue direct file server requests, interpret and |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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modify inbound messages and change file and metadata. A compression plugin |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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may need to intercept file read or file write requests which are sent from |
59758314f811
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the client to provide a seamless user experience. This operation requires |
59758314f811
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the modification of the data, position and length arguments that are sent |
59758314f811
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from the client to the file server. </p> |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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<p>There are some limitations to the file server plugin framework: </p> |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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<ul> |
59758314f811
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<li id="GUID-1C02ECAE-A711-5E2A-8006-EC2D1BF5A859"><p>The file server plugin |
59758314f811
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framework only operates on one client file at any time. However, a plugin |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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itself can operate on any number of files during a single request from the |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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client. </p> </li> |
59758314f811
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<li id="GUID-F82C8E71-479B-5482-8234-C5AD2AD05A91"><p>The file server plugin |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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framework does not enable the compression or encryption of whole volumes. |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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If access to the whole media volume is needed use a <xref href="GUID-983F0ABD-470C-51C3-B6AE-1B1AA55AB4A2.dita">file |
59758314f811
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server extension</xref> rather than a plugin. </p> </li> |
59758314f811
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<li id="GUID-386C0911-30EF-56B0-BD3B-4BC97A7CEFA3"><p>File modification plugins |
59758314f811
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cannot operate on demand paged executables. Demand paging does not use the |
59758314f811
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file server, so the plugin framework cannot be used to encrypt/process the |
59758314f811
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executable. </p> </li> |
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</ul> |
59758314f811
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<note> The improved framework will not prevent deadlock with existing plugins. |
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Plugins that currently issue <xref href="GUID-E263C747-946F-35AA-9F1D-41833BD350FC.dita"><apiname>RFs</apiname></xref> requests must be migrated |
59758314f811
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to the new APIs to prevent deadlock. Follow the guidelines within the <xref href="GUID-00764271-AD6B-5F41-AF72-843107EBF95F.dita">plugin implementation tutorial</xref></note> |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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<ul> |
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<li id="GUID-0A5ECCEA-CD70-528D-8880-463CA77D797B"><p> <xref href="GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6.dita#GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6/GUID-8B5B325D-D88C-55A7-9684-C2DCF81FCD79">Plugin type</xref>, </p> </li> |
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<li id="GUID-40202D9E-C136-55BB-A5A1-DF64971B99D1"><p> <xref href="GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6.dita#GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6/GUID-C76B06C8-DEDC-57AC-A510-3DD1E232241A">Architecture</xref>, </p> </li> |
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<li id="GUID-60C8A1F1-6BE6-59A3-8F33-BD7FBFF9FB59"><p> <xref href="GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6.dita#GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6/GUID-6234893D-A1C8-5870-9761-9EA2BD6909F0">Plugin order</xref>, </p> </li> |
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<li id="GUID-20D4D10F-5E92-5FE3-A89C-DAF45E52EB0B"><p> <xref href="GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6.dita#GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6/GUID-DB21C0FD-46F8-5E4F-9288-69AE8609482B">Drive selection</xref>, </p> </li> |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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<li id="GUID-91E1927C-3AA6-5594-8238-EA7B590278B2"><p> <xref href="GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6.dita#GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6/GUID-50F7CD3A-A051-5498-8886-B4501523FD1D">Interception of file server requests</xref>, </p> </li> |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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<li id="GUID-59EB5503-3D02-5E2D-80A4-A20EA8364D81"><p> <xref href="GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6.dita#GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6/GUID-0B7B373D-41ED-5C91-ACC4-393A8669815A">Security</xref>. </p> </li> |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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</ul> |
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<section id="GUID-8B5B325D-D88C-55A7-9684-C2DCF81FCD79"><title>Plugin type</title> <p>There |
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are two different types of file server plugins: </p> <ul> |
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<li id="GUID-0FBE9E75-D164-5BCC-B00A-A5A76DBD200C"><p>Observer plugins - intercept |
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requests but do not modify file data or associated meta data. </p> <p>Examples |
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of observer plugins are those for virus scanning or logging. </p> </li> |
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<li id="GUID-69708845-9C79-5C19-B758-AEF8F8A693E0"><p>Modifier plugins - intercept |
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requests and modify the data or associated meta data of the target files or |
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directories.. </p> <p>Examples of file modifier plugins are compression and |
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encryption plugins. </p> </li> |
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</ul> </section> |
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<section id="GUID-C76B06C8-DEDC-57AC-A510-3DD1E232241A"><title>Architecture</title> <p>This |
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section describes the structure of the plugin framework and the changes that |
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have been made to the framework in v9.5: </p> <ul> |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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<li id="GUID-399FE2E3-6576-5F98-83A8-70B9F77C65B7"><p> <xref href="GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6.dita#GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6/GUID-3D91570E-8939-557B-8E1E-3A3C5BD27A26">Threads and execution context</xref>, </p> </li> |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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<li id="GUID-609612CB-E684-5BDA-88FC-16FFB71D70C2"><p> <xref href="GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6.dita#GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6/GUID-71DC7464-0EF0-5F78-816E-24F73F5FCA12">Exclusive access</xref>, </p> </li> |
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<li id="GUID-665C36D1-DDD3-5DA4-86A3-574DFDC38AFF"><p> <xref href="GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6.dita#GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6/GUID-9C152BE3-9113-5A0C-8EE2-81ADD09BEAD2">Intercepting requests to the ROM drive</xref>, </p> </li> |
59758314f811
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<li id="GUID-F06D0F56-40AA-5631-9686-BA955E8E263B"><p> <xref href="GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6.dita#GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6/GUID-AA3990F3-52AB-5B14-8ED4-50CCA824AF84">Preventing deadlock</xref>. </p> </li> |
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</ul> <p>The diagram below shows how plugins fit into the File Server software |
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stack. </p> <fig id="GUID-EF5AECEC-9CB0-54B0-B6D2-46266B5FF49E"> |
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<image href="GUID-9A4543B3-2A79-5604-AE11-5087507C6755_d0e369788_href.png" placement="inline"/> |
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</fig> <p> <b>Note</b>: more than one plugin can be loaded into the file server |
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at the same time. A plugin is not aware of other plugins. </p> <p id="GUID-3D91570E-8939-557B-8E1E-3A3C5BD27A26"><b> Threads and execution context</b> </p> <p>The |
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Symbian platform File Server has multiple threads. There is a thread for each |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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69 |
drive in use and a main thread that receives the requests from clients and |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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70 |
sends them to the drive threads. Synchronous drives, however, do not have |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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71 |
their own drive thread; requests for these are processed by the main thread. |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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72 |
There is also a separate thread for processing session disconnect requests. </p> <p>Each |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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plugin also has its own thread for processing requests. Requests are dispatched |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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to the plugin thread associated with the request's drive before they are dispatched |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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to the drive thread. This is discussed in more detail in <xref href="GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6.dita#GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6/GUID-50F7CD3A-A051-5498-8886-B4501523FD1D">interception of file server requests</xref>. </p> <p id="GUID-71DC7464-0EF0-5F78-816E-24F73F5FCA12"><b>Exclusive access</b> </p> <p>Previously, |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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76 |
when a client application opens a file for exclusive write access, no other |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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77 |
clients could access the file until the client closed its associated subsession. |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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78 |
This also applied to plugins that needed to modify file data (as they are |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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79 |
also clients of the file server). </p> <p>Symbian platform provides plugins |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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that are able to perform operations on files and directories irrespective |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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81 |
of the mode in which the file has been opened. </p> <p>Operations are now |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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82 |
able to use the same file handle as the originating request (run in the same |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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83 |
context as the original request) so files opened for exclusive access can |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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still be written to by a plugin wishing to modify the file. </p> <p id="GUID-9C152BE3-9113-5A0C-8EE2-81ADD09BEAD2"><b>Intercepting ROM drive requests</b> </p> <p>Previously, |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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plugins could not intercept any requests to the ROM drive (Z) however, there |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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86 |
is a requirement to be able to intercept requests on this drive to enable |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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secure-load and logging plugins. Requests to drive Z can now be intercepted |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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by plugins. See the tutorial for <xref href="GUID-00764271-AD6B-5F41-AF72-843107EBF95F.dita#GUID-00764271-AD6B-5F41-AF72-843107EBF95F/GUID-89CF85BE-784F-5237-9F78-69D603B650C4">CFsPluginFactory</xref> for more details. </p> <p id="GUID-AA3990F3-52AB-5B14-8ED4-50CCA824AF84"><b>Preventing deadlock</b> </p> <p>The |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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89 |
new framework allows a plugin to have direct access to file data without the |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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need to issue new file server requests through the <xref href="GUID-BE0804F6-4375-3C8A-8C83-968F510466E0.dita"><apiname>RFile</apiname></xref>, <xref href="GUID-12AE154F-7741-38C0-ADFE-9784FCF5E516.dita"><apiname>RDir</apiname></xref> and <xref href="GUID-E263C747-946F-35AA-9F1D-41833BD350FC.dita"><apiname>RFs</apiname></xref> client |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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91 |
APIs. In the pre-9.5 approach it was possible to reach deadlock if more than |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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one plugin was present. </p> <p>The diagram below shows two plugins in the |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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pre v9.5 framework. If both plugins issue new file server requests and if |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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the plugins are not re-entrant safe this can lead to deadlock in the file |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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95 |
server. </p> <fig id="GUID-01A69E82-BF01-520A-A8C5-927F1ED85E04"> |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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<title> File server deadlock </title> |
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80ef3a206772
Week 28 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 1897, Bug 344, Bug 2681, Bug 463, Bug 1522.
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<image href="GUID-9CC5E096-74FB-59AB-BAB9-A5486B961B7D_d0e369864_href.png" placement="inline"/> |
9
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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</fig> <p>The framework introduced in v9.5 prevents deadlock by allowing plugins |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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to issue internal file server requests after intercepting a request by using |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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the newly introduced <xref href="GUID-3C50CF63-9AF4-3F36-8B8F-3FBB613E1CAC.dita"><apiname>RFilePlugin</apiname></xref>, <xref href="GUID-2E871434-D08F-3275-AC55-260A9A78661A.dita"><apiname>RDirPlugin</apiname></xref> and <xref href="GUID-DE8D8017-6E9C-38CE-A023-98A53CDF7152.dita"><apiname>RFsPlugin</apiname></xref> APIs |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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and not by using the <xref href="GUID-E263C747-946F-35AA-9F1D-41833BD350FC.dita"><apiname>RFs</apiname></xref>, <xref href="GUID-BE0804F6-4375-3C8A-8C83-968F510466E0.dita"><apiname>RFile</apiname></xref> and <xref href="GUID-12AE154F-7741-38C0-ADFE-9784FCF5E516.dita"><apiname>RDir</apiname></xref> APIs. |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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102 |
Internally issued requests are only dispatched to plugins mounted below the |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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issuing plugin and the appropriate drive thread. </p> <p>The sequence of events |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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for a typical plugin intercepting a file read request is illustrated below: </p> <fig id="GUID-E366027F-3112-520F-A118-4C048102749E"> |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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<title> Read request intercepted by a plugin |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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106 |
</title> |
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80ef3a206772
Week 28 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 1897, Bug 344, Bug 2681, Bug 463, Bug 1522.
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<image href="GUID-2ABCF233-7DCC-59E2-B075-81E148A1D2AB_d0e369902_href.png" placement="inline"/> |
9
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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</fig> <p>The classes <xref href="GUID-3C50CF63-9AF4-3F36-8B8F-3FBB613E1CAC.dita"><apiname>RFilePlugin</apiname></xref>, <xref href="GUID-2E871434-D08F-3275-AC55-260A9A78661A.dita"><apiname>RDirPlugin</apiname></xref> and <xref href="GUID-DE8D8017-6E9C-38CE-A023-98A53CDF7152.dita"><apiname>RFsPlugin</apiname></xref> have |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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109 |
been introduced to facilitate plugins with direct access behaviour on file |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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and directory requests. These classes are analogous to the client-side <xref href="GUID-BE0804F6-4375-3C8A-8C83-968F510466E0.dita"><apiname>RFile</apiname></xref>, <xref href="GUID-12AE154F-7741-38C0-ADFE-9784FCF5E516.dita"><apiname>RDir</apiname></xref> and <xref href="GUID-E263C747-946F-35AA-9F1D-41833BD350FC.dita"><apiname>RFs</apiname></xref> classes and have functions with similar or identical signitures. </p> <p>In |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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111 |
order to perform requests on a file it is necessary to open a sub-session |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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by calling either <xref href="GUID-EC8FDB25-3DD7-3F1C-9875-0FA9315AE9AC.dita"><apiname>AdoptFromClient()</apiname></xref> or <xref href="GUID-20D0D10F-3401-3F72-8AF6-DC35F6025DC2.dita"><apiname>Open()</apiname></xref>. <codeph>AdoptFromClient()</codeph> is |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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used in order to open a sub-session with the file associated with the client’s |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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request. Alternatively the <codeph>Open()</codeph> method can be used to open |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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either a different file, or the file associated with the client’s request |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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possibly with a different access mode. </p> <p>More than one file can be opened |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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at any time by creating multiple instances of <xref href="GUID-3C50CF63-9AF4-3F36-8B8F-3FBB613E1CAC.dita"><apiname>RFilePlugin</apiname></xref>. </p> <p>The |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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following example shows how to open many files from a plugin during a single |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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request: </p> <codeblock id="GUID-AFCA6392-2414-591A-98C5-A9FC2C103755" xml:space="preserve">// Define the object |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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RFilePlugin clientsFile(aRequest); |
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|
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// Opens the file associated with the intercepted request |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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Tint r = clientsFile.AdoptFromClient(); |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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User::LeaveIfError(r); |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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TBuf<20> data; |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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TInt64 pos = (Tint64)0; |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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Tint length = 0; |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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|
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// Read the file |
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r = clientsFile.Read(pos, data, length); |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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User::LeaveIfError(r); |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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|
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// Open a second file |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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RFilePlugin secondFile(aRequest); |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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_LIT(KSecondName, ”D:\\myfile.txt”); |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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r = secondFile.Open(KSecondName(), EFileRead); |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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User::LeaveIfError(r); |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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|
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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// Read from second file |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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TBuf<20> data2; |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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TInt64 pos2 = (Tint64)0; |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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Tint length2 = 0; |
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|
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// Read the file |
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r = secondFile.Read(pos2, data2, length2); |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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User::LeaveIfError(r); |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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|
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// Close the files |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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clientsFile.Close(); |
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secondFile.Close();</codeblock> <p><b>Issuing |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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an internal file system request</b> </p> <p>An internal request can be marked |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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as ‘Direct to Drive’. This allows requests that are generated by a plugin |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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to be dispatched straight to the drive thread bypassing all other plugins |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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which may be mounted below the plugin that issued the request. After being |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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processed by the drive thread the request also bypasses the plugins between |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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the drive thread and the plugin that the Direct to Drive request originated |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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from. Once returned to the plugin that generated the request, the Direct to |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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Drive request is complete and any other requests issued from the plugin are |
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processed by plugins further down the plugin-stack in the normal manner. </p> <p>The |
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last argument of the <xref href="GUID-3C50CF63-9AF4-3F36-8B8F-3FBB613E1CAC.dita"><apiname>RFilePlugin</apiname></xref> constructor of the classes <xref href="GUID-3C50CF63-9AF4-3F36-8B8F-3FBB613E1CAC.dita"><apiname>RFilePlugin</apiname></xref>, <xref href="GUID-DE8D8017-6E9C-38CE-A023-98A53CDF7152.dita"><apiname>RFsPlugin</apiname></xref> and <xref href="GUID-2E871434-D08F-3275-AC55-260A9A78661A.dita"><apiname>RDirPlugin</apiname></xref> is named <codeph>aDirectToDrive</codeph>. <codeph>aDirectToDrive</codeph> is |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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a boolean value (<codeph>TBool</codeph>) to indicate that the request is Direct |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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to Drive. The default value is <codeph>EFalse</codeph> indicating that the |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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request is interceptable by plugins further down the plugin-stack. </p> </section> |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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<section id="GUID-6234893D-A1C8-5870-9761-9EA2BD6909F0"><title>Plugin order</title> <p>The |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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Plugin framework provides support for multiple plugins to be present and active. |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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Plugins are arranged in a stack. Plugins intercept requests in the order they |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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are arranged in the stack with the plugin at the top of the stack (at the |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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smallest numerical absolute position) getting the first intercept. The order |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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of plugins in the stack is therefore crucial to the correct operation of the |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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file server when more than one plugin is active, especially when the plugins |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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are modifier plugins (i.e when both modify the data or parameters of the requests). </p> <p>If |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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two plugins are active and one of those is a virus scanner, for the virus |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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scanner to operate correctly it must be the first plugin to intercept requests. |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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This is so that the virus scanner can have first refusal to block any requests |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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for files which it believes may not be safe for opening. If there is another |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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plugin higher in the stack then this plugin could send Direct To Drive requests, |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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for example, and would significantly reduce the virus scanning ability of |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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the virus scanning plugin. </p> <p>Two mechanisms are provided that allow |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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plugin authors to control the position of their plugins in the plugin stack |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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these are Absolute position and Unique position. </p> <p id="GUID-5C258D67-C324-5FA4-894A-88532F925EFF"><b>Absolute position </b> </p> <p>Plugins |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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can be inserted into the stack by specifying an absolute position at mount |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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time. This absolute position is the index in the internal array of plugins |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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in which the plugin should be mounted. The plugin at position 0 being the |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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first plugin to be able to intercept requests. </p> <fig id="GUID-41EB2F58-407F-52C7-A40C-0E3858CF718B"> |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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<title> Plugin stack showing absolute positions |
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</title> |
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Week 28 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 1897, Bug 344, Bug 2681, Bug 463, Bug 1522.
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<image href="GUID-64BDD1DA-6B93-5F45-8CBD-7DBAF92CC4C7_d0e370028_href.png" placement="inline"/> |
9
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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</fig> <p>The absolute position method is more appropriate for mounting plugins |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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that operate regardless of their position in the plugin stack or when all |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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of the plugins for a device are known and installed when manufactured. This |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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method does not suit plugins that are added after manufacture where the dependencies |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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of other available plugins is not known. If this is the case use the unique |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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position method described below. </p> <p id="GUID-90FC1AD9-D709-5105-A445-0AA3D7BA85B7"><b>Unique position</b> </p> <p>Plugins |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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can be ordered according to a unique position stored within the plugin. Unique |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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position identifiers are defined by the manufacturer during the software validation/signing |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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process. Unique positions are defined in the derived <xref href="GUID-8A3B2A79-05A6-3BD7-AEA9-02435476F45E.dita"><apiname>CFsPluginFactory</apiname></xref> class. |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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See the description in <xref href="GUID-00764271-AD6B-5F41-AF72-843107EBF95F.dita#GUID-00764271-AD6B-5F41-AF72-843107EBF95F/GUID-89CF85BE-784F-5237-9F78-69D603B650C4">CFsPluginFactory</xref>. </p> <p>The position value specifies the category and position of the plugin: </p> <table id="GUID-22362455-13BE-5A26-8750-A94E79941EF3"> |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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<tgroup cols="2"><colspec colname="col0"/><colspec colname="col1"/> |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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199 |
<tbody> |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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200 |
<row> |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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<entry><p> <b>plugin Type</b> </p> </entry> |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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<entry><p> <b>Unique Position Range</b> </p> </entry> |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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</row> |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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<row> |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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<entry><p>File Observers </p> </entry> |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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<entry><p> <codeph>0x20000000 - 0x2FFFFFFF</codeph> </p> </entry> |
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</row> |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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<row> |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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<entry><p>File Modifiers </p> </entry> |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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<entry><p> <codeph>0x40000000 - 0x4FFFFFFF</codeph> </p> </entry> |
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</row> |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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</tbody> |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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</tgroup> |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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</table> <p>File Observers do not modify data so they are allocated a lower |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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range of numbers placing them at the top of the plugin stack. File Modifiers |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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modify the data stream so they are allocated a higher range placing them lower |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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down the plugin stack. </p> <p> <b>Note</b>: a plugin has a unique position |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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then do not specify an <xref href="GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6.dita#GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6/GUID-5C258D67-C324-5FA4-894A-88532F925EFF">absolute |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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position</xref> when mounting it, otherwise the error <codeph>KErrNotSupported</codeph> is |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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returned. </p> </section> |
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<section id="GUID-DB21C0FD-46F8-5E4F-9288-69AE8609482B"><title>Drive selection</title> <p>A |
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File Server Plugin can intercept requests for a specific drive or for all |
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drives. A plugin that intercepts requests for all drives must filter requests |
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that are not appropriate for some drives. Requests can be filtered within |
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an overridden <xref href="GUID-00764271-AD6B-5F41-AF72-843107EBF95F.dita#GUID-00764271-AD6B-5F41-AF72-843107EBF95F/GUID-97427151-C6E4-5FE4-8197-0D7C58EDB29F">CFsPlugin::Deliver()</xref> function. </p> <p>There are two ways to specify a drive: </p> <ul> |
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<li id="GUID-296E3A2E-5985-5E4B-96A2-D247D1FAA07C"><p>When the plugin is mounted. |
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See <xref href="GUID-00764271-AD6B-5F41-AF72-843107EBF95F.dita#GUID-00764271-AD6B-5F41-AF72-843107EBF95F/GUID-BED54BD9-2F3F-588E-854B-C28745C8F30A">mounting |
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a plugin</xref>. </p> </li> |
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<li id="GUID-080CD9C3-2BEA-5209-974A-910606EBF22A"><p>At run-time through |
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the use of <xref href="GUID-8A3B2A79-05A6-3BD7-AEA9-02435476F45E.dita#GUID-8A3B2A79-05A6-3BD7-AEA9-02435476F45E/GUID-45A67073-5EF4-3966-A2FD-555B56C89284"><apiname>CFsPluginFactory::iSupportedDrives</apiname></xref>. See the |
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tutorial for <xref href="GUID-00764271-AD6B-5F41-AF72-843107EBF95F.dita#GUID-00764271-AD6B-5F41-AF72-843107EBF95F/GUID-89CF85BE-784F-5237-9F78-69D603B650C4">CFsPluginFactory</xref>. </p> </li> |
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</ul> <p>If the drive is not specified then <xref href="GUID-E263C747-946F-35AA-9F1D-41833BD350FC.dita#GUID-E263C747-946F-35AA-9F1D-41833BD350FC/GUID-61640192-646E-33DA-B186-5EE63B07A998"><apiname>RFs::MountPlugin()</apiname></xref> attempts |
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to mount the plugin for all drives. If this behaviour is not supported by |
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the plugin <xref href="GUID-F89DA3F0-2A48-3F9B-8F08-29350E92D0E4.dita"><apiname>KErrNotSupported</apiname></xref> is returned. </p> </section> |
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<section id="GUID-50F7CD3A-A051-5498-8886-B4501523FD1D"><title> Interception |
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of file server requests</title> <p>After a file server request has been initialised |
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by the main file server thread it can be intercepted by a plugin. There are |
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two types of intercept: </p> <ul> |
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<li id="GUID-288866F8-ABE5-5569-A70C-2C86B4F073B9"><p> <xref href="GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6.dita#GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6/GUID-05F613B8-FF66-54B6-8D49-2BF92914E54E">pre-operation intercepts</xref>, </p> </li> |
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<li id="GUID-E876E576-1E94-5F06-8305-22D620A82B6F"><p> <xref href="GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6.dita#GUID-DEF3B8B3-5BD7-505B-93F9-A20CE00FFAE6/GUID-59FD1CED-5A32-5F6E-A256-821A2783D065">post-operation intercepts</xref>. </p> </li> |
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</ul> <p>Plugins can register for pre-intercepts, for post-intercepts or for |
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both pre and post-intercepts. </p> <p id="GUID-05F613B8-FF66-54B6-8D49-2BF92914E54E"><b>Pre-operation</b> </p> <p>Pre-operation |
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intercepts occur before the drive associated with a request processes it. |
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In a file write request for example, the pre-intercept operations occur before |
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data has been written to the file. Requests are passed down the plugin-stack |
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from the file server towards the drive thread. </p> <p>When the main file |
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server thread has initialised a request, the request is dispatched to the |
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highest plugin in the stack. This plugin must have been mounted on the requested |
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drive and registered to pre-intercept this type of request. See <xref href="GUID-00764271-AD6B-5F41-AF72-843107EBF95F.dita#GUID-00764271-AD6B-5F41-AF72-843107EBF95F/GUID-BED54BD9-2F3F-588E-854B-C28745C8F30A">mounting a plugin</xref>. The request is dispatched by calling the plugin's <xref href="GUID-BC0DB991-EF52-3344-8E6A-F8060B75A189.dita#GUID-BC0DB991-EF52-3344-8E6A-F8060B75A189/GUID-2EACA8A8-D569-3D6A-9383-451587A65839"><apiname>CFsPlugin::Deliver()</apiname></xref> function. </p> <p>The <codeph>Deliver()</codeph> function runs in the context of the previous calling thread, |
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this can be the main file server thread or a plugin thread. Override <codeph>CFsPlugin::Deliver()</codeph> to |
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filter the request. If the <codeph>Deliver()</codeph> function has not been |
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overridden then the request is dispatched for asynchronous processing by calling |
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the base class <codeph>Deliver()</codeph>. See the <xref href="GUID-00764271-AD6B-5F41-AF72-843107EBF95F.dita#GUID-00764271-AD6B-5F41-AF72-843107EBF95F/GUID-97427151-C6E4-5FE4-8197-0D7C58EDB29F">CFsPlugin::Deliver()</xref> tutorial section. </p> <p id="GUID-59FD1CED-5A32-5F6E-A256-821A2783D065"><b>Post operation</b> </p> <p>Post-operation |
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intercepts occur after the drive associated with a request has processed it. |
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In a file write request for example, the post-intercept occurs after data |
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has been written to the file. Requests are passed from the drive thread back |
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up the stack towards the client. </p> <p>When the drive thread has finished |
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processing a request it dispatches it to the plugin lowest in the stack by |
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calling the plugin's <xref href="GUID-C6F20230-3D6C-3392-B040-CF627534B930.dita"><apiname>Deliver()</apiname></xref> function. </p> <p><b> Filtering requests internally</b> </p> <p>The <xref href="GUID-F1B37142-1EEF-3777-82B1-303982B888EC.dita#GUID-F1B37142-1EEF-3777-82B1-303982B888EC/GUID-8EBEAD17-B03C-3DBA-9A47-0F7DB07785F9"><apiname>CFSPlugin::Deliver()</apiname></xref> function |
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filters the request and decides what kind of action is neccessary in terms |
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of the flow of the request through the plugin stack: </p> <ul> |
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<li id="GUID-3E8CAD7B-BE13-531E-A387-432F4CD463C9"><p> <xref href="GUID-1E025D93-3D66-3E88-830D-CBB3A471A777.dita"><apiname>KPluginMessageForward</apiname></xref> is |
59758314f811
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returned if the intercept is pre-operation. The request is passed to the next |
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plugin down the stack or to the drive thread if there are no more plugins. </p> </li> |
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<li id="GUID-1FFEFFF4-3D5F-590F-8884-CA27B2B5B916"><p> <xref href="GUID-81C5F6A1-3FCA-33E5-99C6-7901D41BCBDE.dita"><apiname>KPluginMessageComplete</apiname></xref> is |
59758314f811
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returned if the intercept is post-operation. The request is passed to the |
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next plugin up the stack or if there are no more plugins to process the request |
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it is passed to the main file server thread. </p> </li> |
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</ul> <p>If the request requires processing by the plugin then the plugin's <codeph>Deliver()</codeph> function |
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calls the base class <codeph>Deliver()</codeph> function and the request is |
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dispatched to the plugin's thread for asynchronous processing. </p> <p>Asynchronous |
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processing is carried out in the plugin's <xref href="GUID-8EF10689-68B7-391B-AD5C-4F51780165FF.dita"><apiname>DoRequestL()</apiname></xref> function. |
59758314f811
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A plugin can only have a single <codeph>DoRequestL()</codeph> function which |
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must handle both pre and post-intercepts. Plugin authors can use the <xref href="GUID-06E787C2-FAC1-36D2-9C64-11BDA1B656F1.dita"><apiname>IsPostOperation()</apiname></xref> function |
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of the utility class, <xref href="GUID-A814151C-8AEC-3E16-8691-33174B64E36F.dita"><apiname>TFsPluginRequest</apiname></xref> to indicate whether |
59758314f811
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the <codeph>DoRequestL()</codeph> is processing a request as a pre-intercept |
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or post-intercept. See the description of <xref href="GUID-00764271-AD6B-5F41-AF72-843107EBF95F.dita#GUID-00764271-AD6B-5F41-AF72-843107EBF95F/GUID-14773530-7C15-52E2-A542-72A0B2163461">TFsPluginRequest</xref>. </p> <p>Once the asynchronous processing is complete the <codeph>DoRequestL()</codeph> function |
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returns <codeph>KErrNone</codeph> and the request is passed to the next plugin |
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down the stack by calling its <xref href="GUID-C6F20230-3D6C-3392-B040-CF627534B930.dita"><apiname>Deliver()</apiname></xref> function. If there |
59758314f811
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are no lower plugins then the request is passed to the appropriate drive thread |
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for processing. </p> <p>If the plugin intercepts a request in pre-operation |
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and wants to complete the request on behalf of the client then the plugin |
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can return <xref href="GUID-DCECEF73-9C33-3C14-951D-E75D89B21FBA.dita"><apiname>KErrCompletion</apiname></xref> to indicate that the request |
59758314f811
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has been completed and that the request is now in post operation mode. The |
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flow will then proceed to any previous plugins if mounted or directly back |
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to the client otherwise. <xref href="GUID-DCECEF73-9C33-3C14-951D-E75D89B21FBA.dita"><apiname>KErrCompletion</apiname></xref> prevents any further |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
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plugins further down the stack from intercepting the request. </p> <p>When |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
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a plugin intercepts file read or file write and does an early completion (i.e. |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
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returns <xref href="GUID-DCECEF73-9C33-3C14-951D-E75D89B21FBA.dita"><apiname>KErrCompletion</apiname></xref> in pre-intercept) then the plugin |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
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290 |
author should call <xref href="GUID-A814151C-8AEC-3E16-8691-33174B64E36F.dita#GUID-A814151C-8AEC-3E16-8691-33174B64E36F/GUID-149E1448-63AA-3F08-A3A2-606D240A8927"><apiname>TFsPluginRequest::SetSharePos()</apiname></xref> to allow |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
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share position to be updated after early read/write completion. </p> </section> |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
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292 |
<section id="GUID-0B7B373D-41ED-5C91-ACC4-393A8669815A"><title>Security</title> <p>File |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
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293 |
server plugins are implemented as libraries that are loaded into the file |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
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294 |
server process at runtime. Therefore, plugins must have the same <xref href="GUID-4BFEDD79-9502-526A-BA7B-97550A6F0601.dita">platform |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
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295 |
security</xref> capabilities as the file server process, these are <xref href="GUID-2A022229-C333-3B0A-99A5-13CA0710025D.dita"><apiname>TCB</apiname></xref>, <xref href="GUID-E5C21B79-529B-397E-8A22-63612CA52869.dita"><apiname>ProtServ</apiname></xref>, <xref href="GUID-8DC76E7B-9EB3-3848-AD8D-3D519388A504.dita"><apiname>DiskAdmin</apiname></xref>, <xref href="GUID-ECCA7246-B2BA-3261-95C9-9E72C6EC51D4.dita"><apiname>AllFiles</apiname></xref>, <xref href="GUID-93881606-AA56-385F-A958-3957142BEFE3.dita"><apiname>PowerMgmt</apiname></xref> and <xref href="GUID-616F0C5B-D2C1-39D8-9BFC-53A2AEC7C850.dita"><apiname>CommDD</apiname></xref>. </p> <p>Any |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
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296 |
user side process that wishes to load and mount plugins must have the <codeph>DiskAdmin</codeph> capability. </p> </section> |
5
f345bda72bc4
Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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</conbody></concept> |