PJ40944: FILE SYSTEM STOPPED WORKING

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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 number

    PJ40944

  • Reported component name

    Z/TPF

  • Reported component ID

    5748T1501

  • Reported release

    110

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-03-15

  • Closed date

    2013-04-15

  • Last modified date

    2013-04-15

  • 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

       UP



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Document information


More support for:

TPF
z/TPF

Software version:

110

Reference #:

PJ40944

Modified date:

2013-04-15

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