[lustre-discuss] llapi_file_get_stripe() and lmm_stripe_offset

[John Bauer]

I have noticed some inconsistencies in the *lfs setstripe/getstripe 
*commands and *llapi_file_get_stripe(*) function.   Notice in the lfs 
setstripe/getstripe example below that specifying 7 for the offset with 
lfs setstripe -i 7 results in lfs getstripe reporting 
lmm_stripe_offset=7.  That all looks good.  But the simple program below 
that calls *llapi_file_get_stripe() *and prints out the *lmm_XXX* values 
reports *lmm_stripe_o**ffset**=0*. Doesn't seem right.

% lfs setstripe -c 4 -i *7* file.dat
% lfs getstripe file.dat
file.dat
lmm_stripe_count:   4
lmm_stripe_size:    1048576
lmm_pattern:        1
lmm_layout_gen:     0
lmm_stripe_offset: *7*
         obdidx           objid           objid           group
              7         5611546       0x55a01a                0
              0         5607846       0x5591a6                0
              8         5612725       0x55a4b5                0
             16         5611434       0x559faa                0


But whenever I call llapi_file_get_stripe(), the value 
*lmm_stripe_offset* that is returned in the *struct lov_user_md* is 
always 0.


% *./main.exe file.dat*
0=llapi_file_get_stripe()
lmm_stripe_count=4
lmm_stripe_size=1048576
lmm_pattern=1
lmm_layout_gen=0
lmm_stripe_offset=0
% *cat main.c*
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "lustre/lustre_user.h"

main(int argc, char **argv){
    if( argc < 2 ) return -1 ;
    char *fileName = argv[1] ;
    struct lov_user_md_v3 lum ;
    memset( &lum, 0, sizeof(lum) ) ;
    int status = llapi_file_get_stripe(fileName, &lum);
    fprintf(stderr,"%d=llapi_file_get_stripe()\n",status);
    if( status != 0 ) return -1 ;
    fprintf(stderr,"lmm_stripe_count=%d\n",lum.lmm_stripe_count);
    fprintf(stderr,"lmm_stripe_size=%lld\n",lum.lmm_stripe_size);
    fprintf(stderr,"lmm_pattern=%d\n",lum.lmm_pattern);
    fprintf(stderr,"lmm_layout_gen=%d\n",lum.lmm_layout_gen);
fprintf(stderr,"lmm_stripe_offset=%d\n",(int)lum.lmm_stripe_offset);
    exit(0);
}


-- 
I/O Doctors, LLC
507-766-0378
bauerj at iodoctors.com

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