PJ40944: FILE SYSTEM STOPPED WORKING

APAR status

• Closed as program error.

Error description

• See Problem Summary.
  

Local fix

• na
  

Problem summary

• APAR NUMBER:  PJ40944
  PRODUCT:  z/TPF
  FUNCTIONAL AREA:  FILE SYSTEM SUPPORT
  SHIPPED IN PUT:  10
  
  ABSTRACT:
  Due to PJ30915, when filesystem security support is enabled,
  possible system outage may occur due to lack of system
  resources.
  
  PACKAGE CONTENTS:
  Source Segments:
  (C) base/filesys/tfs/tfs_vnops.c
  (C) base/filesys/tpf/cpwgr0.c
  
  Object Only Binaries:
  None.
  
  Configuration Independent Binaries:
  (C) base/filesys/obj/cpwgr0.o
  (C) base/filesys/obj/tfs_vnops.o
  (C) base/stdlib/libCFVS.so
  (C) base/stdload/CFVS.so
  
  Support Files:
  base/filesys/lst/cpwgr0.lst
  base/filesys/lst/CFVS.map
  base/filesys/lst/tfs_vnops.lst
  
  OTHER BINARIES TO BUILD: NO
  None.
  
  COMMENTS:
  When filesystem security support is enabled, if users are added
  or removed while a large number of ecbs are accessing the
  filesystem, the ecbs may start to backup due to the
  filesystem's internal locking. If this occurs long delays and
  possible system outage may occur due to lack of system
  resources.
  

Problem conclusion

• SOLUTION:
  The mainline paths in the TFS filesystem (primarily the
  pathname translation code in tfs_vnops.c) were updated to drive
  the tfs_iaccess function directly. This avoids costly and
  unnecessary calls to the filesystem security code that was
  being done when those mainline paths were driving tfs_iaccess
  indirectly (via VOP_ACCESS). Secondly, the security support
  itself, in cpwgr0.c, was updated to alleviate contention for
  the locks. This avoids having ecbs backup on the lock where the
  calls to the security support are necessary.
  
  COREQS: NO
  None.
  
  MIGRATION CONSIDERATIONS: NO
  None.
  
  BUILD COMMANDS AND INSTRUCTIONS: YES
  #maketpf commands for linux
  maketpf -f CFVS cpwgr0.o tfs_vnops.o
  maketpf CFVS link TPF_VERIFY_LINK_REFS=NO
  maketpf CFVS link
  
  UPDATED INFORMATION UNITS: NO
  None.
  
  See your IBM representative if you need additional information.
  
  DOWNLOAD INSTRUCTIONS:
  http://www.ibm.com/software/htp/tpf/maint/maintztpf.html
  
  APAR URL:
  http://www.ibm.com/software/htp/tpf/ztpfmaint/put10/PJ40944.htm
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  Z/TPF

• Fixed component ID

  5748T1501

Applicable component levels

• R110 PSY

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