The following “KEK FD Wrapper 2006” is modification of the KEK existing wrapper 2000. It is quite similar with the KEK existing wrapper 2000 so that your application change is minimum.

For more details about these API, please refer to A.1 KEK Existing Wrapper 2000 – API Specification.

KEK FD Wrapper 2006 (7)

1 close

2 creat

3 fsync

4 open

5 read

6 sync

7 write

^{1.1.1 KEK FD Wrapper 2006 - API
Definition}

Funtion: OPEN

int OPEN(const char *pathname, int flags, mode_t mode);

Funtion: CREAT

int CREAT(const char *pathname, mode_t mode);

Funtion: READ

ssize_t READ(int fd, void *buf, size_t count);

Funtion: WRITE

ssize_t WRITE(int fd, const void *buf, size_t count);

^{1.1.2 KEK FD Wrapper 2006 are
implemented by the following APIs}

Above posix-like-naming APIs are implemented by the following HPSS APIs.

Please refer to 2.2.2 KEK Integer Wrapper 2006 – API Specification for more details about HPSS 6.2 provided posix-like-naming API.

Funtion: hpss_FD_open

int hpss_FD_open( const char *pathname, int flags, mode_t mode) ;

Funtion: hpss_FD_creat

int hpss_FD_creat( const char *pathname, mode_t mode);

Funtion: hpss_FD_read

ssize_t hpss_FD_read( int fd, const void *buf, size_t count);

Funtion: hpss_FD_write

ssize_t hpss_FD_write( int fd, const void *buf, size_t count);

^{1.2 How to Compile and Link}

Headers to be include:

/opt/hpss/kek/wrapper.FD.2006/config.h

Flags to be specified:

CFLAGS = -I. -I/opt/hpss/include -DLINUX -DHPSS51 -DLITTLEEND -D_BSD_SOURCE -D_THREAD_SAFE -DLINUX -D_LARGEFILE_SOURCE=1 -D_LARGEFILE64_SOURCE -D_POSIX_C_SOURCE=199309L -D_XOPEN_SOURCE

LDFLAGS = -L/opt/hpss/lib –L/opt/hpss/tools/kek/lib

Libs and Objects to be linked:

LIBS = -L/opt/hpss/lib -lhpss –L/opt/hpss/tools/kek/lib –lhpssposix

/opt/hpss/kek/wrapper.FD.2006/dummies.o

/opt/hpss/kek/wrapper.FD.2006/FD_wrapper.o

^{1.3 Sample Program and Sample
Makefile}

You can find the sample program and sample Makefile in the following directory.

/opt/hpss/kek/wrapper.FD.2006

^{1.3 Environment Variable –
F_HPSS_BUFSIZE_MB=256}

The following envinroment variable is necessary to use new FD wrapper 2006. It is the number of bytes which specifies the buffer size whish wrapper uses internally in order to make HPSS performance better.

256 is recommended.

It is declared in /opt/profile.d/hpss.sh and /opt/hpss/profile.d/hpss.csh. Please read it before running FD wrapper 2006 application.

export F_HPSS_BUFSIZE_MB=256

^{1.4 Prerequisite}

The following APIs are used to implement above wrappers. They can be also be used as follows in order to re-write your existing application to enable HPSS file I/O.

1 fclose hpss_Fclose

2 fflush hpss_Fflush

3 fopen hpss_Fopen

4 fread hpss_Fread

5 fseek hpss_Fseek

6 ftell hpss_Ftell

7 fwrite hpss_Fwrite

8 File HPSS_FILE

If you want to update your existing Posix API program and enable HPSS file I/O, please include the folloinwg #define statements in your header file.

#define FCLOSE hpss_Fclose

#define FFLUSH hpss_Fflush

#define FOPEN hpss_Fopen

#define FREAD hpss_Fread

#define FSEEK hpss_Fseek

#define FTELL hpss_Ftell

#define FWRITE hpss_Fwrite

#define FILE HPSS_FILE

Please refere to HPSS Programmer's Reference for High Performance Storage System Release 6.2 July 2008 (Revision 2.0) for above APIs specification.

Appendix A. – KEK Wrapper 2000

^{A.0 Overview}

These are APIs provided in year of 2000 for HPSS 4.5. They were ported to HPSS 6.2.2.2p so that they are available now.

The macros/functions to HPSS POSIX-like wrappers for KEK applications has been available since year of 2000. These wrapper APIs are also available at KEK with HPSS 6.2 in year of 2006 and later.

The KEK existing wrapper 2000 API put more priority on performance rather than the compliance with the Posix standard. They buffered I/O so that they are fast on I/O of HPSS files.

^{A.1 KEK Wrapper 2000 – API
Specification}

KEK Existing Wrapper 2000 (12)

1 close

2 creat

3 exit

4 fsync

5 init

6 init2

7 open

8 read

9 stat

10 sync

11 terminate

12 write

If you want to update your existing Posix API program and enable HPSS file I/O, please include the folloinwg #define statement in your header file.

#define OPEN H_OPEN

#define CREAT H_CREAT

#define READ H_READ

#define WRITE H_WRITE

#define FSTAT H_FSTAT

#define FCNTL H_FCNTL

#define FSYNC H_FSYNC

#define INIT H_INIT

#define INIT2 H_INIT2

#define TERM H_TERM

Function: INIT()

Status: Modify

Details

INIT(void) /* calls hpss_SetLoginContext(…); */

Initialize client API wrapper environment

Function: TERM()

Status: Modify

Details

TERM(void) /* calls hpss_PurgeLoginContext(…); */

Terminate client API wrapper environment

Function: OPEN()

Status: Modify

Details

int OPEN(

char *pathname,

int flags);

/* mode_t mode); missing from macros – set to 644 */

This function only supports the following flags:

O_RDONLY

O_WRONLY

O_RDWR

O_APPEND

O_CREAT

O_EXCL

O_TRUNC

All other flags error as “Not Supported”. The COS value for a file uses the default COS for the HPSS system or subsystem.

Function: CREAT()

Status: New

Details

int CREAT(

char *pathname,

mode_t mode);

The COS value for a file uses the default COS for the HPSS system or subsystem.

Function: READ()

Status: Modify

Details

ssize_t READ(

int hpss_fd,

void *buf,

size_t count);

The function performs a buffered read of data from HPSS.

Function: WRITE()

Status: Modify

Details

ssize_t WRITE(

int hpss_fd,

void *buf,

size_t count);

The function performs a buffered write of data to HPSS.

Function: SYNC()

Status: New

Details

int SYNC(

int hpss_fd);

The function will flush any remaining buffer output to an HPSS file.

^{A.2 How to Compile and Link}

Here is how to write Makefile.

CFLAGS = -I. -I/opt/hpss/include -I/opt/hpss/kek/wrapper.2000 -DHPSS_CONFIG_H -DLINUX –DLITTLEEND -fPIC

WRAPPER = /opt/hpss/kek/wrapper.2000/wrapper.o

CONFH = /opt/hpss/kek/wrapper.2000/config.h

LDFLAGS = -L/opt/hpss/lib –L/opt/hpss/tools/kek/lib

LIBS = -L/opt/hpss/lib -lhpss –L/opt/hpss/tools/kek/lib –lhpssposix

Please use #ifdef HPSS_CONFIG_H and #ifdef HPSS62.

Please include /opt/hpss/kek/wrapper.2000/config.h in your source, which uses #ifdef HPSS_CONFIG_H.

Pleae use /opt/hpss/kek/wrapper.2000/wrapper.o with your object module, which uses #ifdef HPSS62.

Please link /opt/kek/hpss/lib/libhpss.so and /opt/kek/hpss/tools/kek/lib/libhpssposix.so.

Please understand that KEK Wrapper 2000 requires #ifdef HPSS_CONFIG_H and #ifdef HPSS62 so please do not use conflict ones.

^{A.3 Sample Programs and Sample Makefile}

You can find the sample Makefile and headers at the following directory.

/opt/hpss/kek/wrapper.2000

^{A.4 Update History}

2006/12/27: Change libhpssposix.so directory because it was changed in HPSS 6.2.1.4

2009/02/24: Mention HPSS Programmer's Reference for High Performance Storage System Release 6.2 July 2008 (Revision 2.0).

2009/02/27: Update title

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