PM94950: Unable to open checked-out 2 gigabyte versioned DO for write access without O

Fixes are available

APAR status

Closed as program error.

Error description

Due to a defect in the copy-on-write code in IBM Rational
ClearCase MVFS, when a 64-bit application attempts to open a
checked-out versioned derived object on AIX without explicitly
specifying the O_LARGEFILE option to the open() function, the
system call will fail to return a file descriptor and the
following error will be presented to the user. Note 'error 127'
on AIX is EOVERFLOW (value too large to be stored in data type)
which occurs when files larger than OFF_MAX (2 gigabytes minus
one byte) are opened without O_LARGEFILE.

cleartext copy-on-write view=root1 vob=/vobs/vob1
dbid=0x80000004 - error 127
cleartext pname=
/viewstore/root/root1.vws/.s/00009/80000004520558c7cow
change oid failed view=root1 vob=/vobs/vob1 dbid=0x80000004 -
error 127
cleartext pname=
/viewstore/root/root1.vws/.s/00009/80000004520558c7cow

However when using an application compiled with -maix64,
O_LARGEFILE should be passed automatically so this error is not
expected.

Steps to reproduce:

1. Create a 2G file (for example, dd if=/dev/zero of=file1 bs=1M
count=2048)
2. Set into a view to a VOB and copy the file into the view
3. Create a Makefile that copies the 2G file to another file.
For example:

=====Makefile=====
all:
        cp file1 file2
==================

4. Run clearmake to generate the derived object 'file2'.
5. Convert the DO into an element with 'cleartool mkelem -ci
file2'.
6. Check out the versioned DO with 'cleartool co file2'.
7. Attempt to open the file with a simple 64-bit C program that
uses the open() function and has been compiled with the -maix64
option.

Workaround: Explicitly specify the O_LARGEFILE option to open()
function.

Local fix

Problem summary

A user of IBM Rational ClearCase is, in some cases, unable to
open a checked out 2 gigabyte file without the O_LARGEFILE
option on AIX.

Problem conclusion

This has been fixed in IBM Rational ClearCase versions 7.1.2.12,
 8.0.0.08 and 8.0.1.01.

Temporary fix

Comments

APAR Information

APAR number
PM94950
Reported component name
CLEARCASE WIN
Reported component ID
5724G2900
Reported release
710
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2013-08-12
Closed date
2013-10-07
Last modified date
2014-05-20

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
CLEARCASE WIN
Fixed component ID
5724G2900

Applicable component levels

R712 PSY
UP
R800 PSY
UP
R801 PSY
UP

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSSH27","label":"Rational ClearCase"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.1","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
02 November 2021

Tips

PM94950: Unable to open checked-out 2 gigabyte versioned DO for write access without O_LARGEFILE option on AIX

Fixes are available

Subscribe

APAR status

Closed as program error.

Error description

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

APAR Information

APAR number

Reported component name

Reported component ID

Reported release

Status

PE

HIPER

Special Attention

Submitted date

Closed date

Last modified date

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

Fixed component ID

Applicable component levels

R712 PSY

R800 PSY

R801 PSY

Document Information

Share your feedback

Need support?