IBM i 7.3 Files and file systems Integrated file system IBM Note Before using this information and the product it supports, read the information in “Notices” on page 149. This edition applies to IBM i 7.3 (product number 5770-SS1) and to all subsequent releases and modifications until otherwise indicated in new editions. This version does not run on all reduced instruction set computer (RISC) models nor does it run on CISC models. This document may contain references to Licensed Internal Code. Licensed Internal Code is Machine Code and is licensed to you under the terms of the IBM License Agreement for Machine Code. © Copyright International Business Machines Corporation 1999, 2015. US Government Users Restricted Rights – Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Contents Integrated file system............................................................................................1 What's new for IBM i 7.3..............................................................................................................................1 PDF file for Integrated file system...............................................................................................................1 Overview of the integrated file system........................................................................................................2 What the integrated file system is..........................................................................................................2 Why use the integrated file system........................................................................................................2 Integrated file system concepts.................................................................................................................. 3 Directory................................................................................................................................................. 3 Current directory...............................................................................................................................6 Home directory................................................................................................................................. 6 Provided directories..........................................................................................................................6 *TYPE2 directories............................................................................................................................9 Link........................................................................................................................................................10 Hard link..........................................................................................................................................11 Symbolic link...................................................................................................................................12 Path name.............................................................................................................................................13 Stream file............................................................................................................................................ 14 Name continuity................................................................................................................................... 15 Extended attributes..............................................................................................................................16 Scanning support..................................................................................................................................17 Examples: Scanning for viruses and files being opened............................................................... 17 Related system values....................................................................................................................18 Scanning occurrences.....................................................................................................................19 Object change............................................................................................................................19 Signature change.......................................................................................................................20 Different CCSID......................................................................................................................... 21 During save operation............................................................................................................... 21 Object integrity check............................................................................................................... 21 File systems............................................................................................................................................... 21 File system comparison....................................................................................................................... 22 "root" (/) file system............................................................................................................................. 27 Case-sensitivity in the "root" (/) file system.................................................................................. 28 Path names in the "root" (/) file system......................................................................................... 28 Links in the "root" (/) file system.................................................................................................... 28 Use of integrated file system commands in the "root" (/) file system...........................................28 Use of integrated file system APIs in the "root" (/) file system..................................................... 29 Object changes journaling in the "root" (/) file system..................................................................29 UDP and TCP devices in the "root" (/) file system..........................................................................29 Open systems file system (QOpenSys)................................................................................................30 Case sensitivity in the QOpenSys file system................................................................................ 30 Path names in the QOpenSys file system...................................................................................... 30 Links in the QOpenSys file system................................................................................................. 31 Use of integrated file system commands and displays in the QOpenSys file system.................. 31 Use of integrated file system APIs in the QOpenSys file system.................................................. 31 Object changes journaling in the QOpenSys file system............................................................... 31 User-defined file systems (UDFSs)...................................................................................................... 32 Temporary user-defined file systems.............................................................................................33 Case sensitivity in an integrated file system user-defined file system......................................... 34 Path names in an integrated file system user-defined file system............................................... 35 Links in an integrated file system user-defined file system.......................................................... 35 Use of integrated file system commands in a user-defined file system....................................... 36 iii Use of integrated file system APIs in a user-defined file system..................................................36 Graphical user interface for a user-defined file system................................................................ 37 Creating an integrated file system user-defined file system.........................................................37 Deleting an integrated file system user-defined file system......................................................... 37 Displaying an integrated file system user-defined file system......................................................38 Mounting an integrated file system user-defined file system....................................................... 38 Unmounting an integrated file system user-defined file system.................................................. 38 Saving and restoring an integrated file system user-defined file system..................................... 38 Object changes journaling in a user-defined file system...............................................................39 User-defined file system and independent auxiliary storage pools..............................................39 Library file system (QSYS.LIB)............................................................................................................. 39 QPWFSERVER authorization list in the QSYS.LIB file system........................................................40 File-handling restrictions in the QSYS.LIB file system.................................................................. 40 Support for user spaces in the QSYS.LIB file system.................................................................... 40 Support for save files in the QSYS.LIB file system.........................................................................40