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Obtain the total number of OSTs, given a folder #202

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Merged
wkliao merged 1 commit into from
Dec 21, 2025
Merged

Obtain the total number of OSTs, given a folder #202

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2 changes: 2 additions & 0 deletions configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -1609,6 +1609,8 @@ AC_CHECK_HEADERS([lustre/lustre_user.h linux/lustre/lustre_user.h],
if test "x$has_lustre" = xyes ; then
AC_DEFINE(HAVE_LUSTRE, 1, [Define for LUSTRE])
LIBS="$LIBS -llustreapi"
# llapi_get_obd_count() can get the total number of available OSTs
AC_CHECK_FUNCS([llapi_get_obd_count])
fi
AM_CONDITIONAL(HAVE_LUSTRE, [test x$has_lustre = xyes])

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47 changes: 47 additions & 0 deletions src/drivers/pncio/pncio_lustre_open.c
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Original file line number Diff line number Diff line change
Expand Up @@ -62,6 +62,52 @@
printf("\t%-14s = %-25s (0x%lx)\n",#val,PATTERN_STR(val, int_str),val); \
}

#ifdef HAVE_LLAPI_GET_OBD_COUNT

/*----< get_total_avail_osts() >---------------------------------------------*/
static
int get_total_avail_osts(const char *path)
{
char *dir_name=NULL, *path_dup=NULL;
int err, ost_count=0, is_mdt=0;
struct stat sb;

path_dup = NCI_Strdup(path);

err = stat(path_dup, &sb);
if (errno == ENOENT) { /* file does not exist, try folder */
/* get the parent folder name */
dir_name = dirname(path_dup);
err = stat(dir_name, &sb);
}
if (err != 0) {
printf("Warning at %s (%d): path \"%s\" stat() failed (%s)\n",
__func__,__LINE__,path,strerror(errno));
goto err_out;
}

/* llapi_get_obd_count() only works for directories */
if (S_ISDIR(sb.st_mode))
dir_name = (dir_name == NULL) ? path_dup : dir_name;
else
/* get the parent folder name */
dir_name = dirname(path_dup);

err = llapi_get_obd_count(dir_name, &ost_count, is_mdt);
if (err != 0) {
printf("Warning at %d: path \"%s\" llapi_get_obd_count() failed (%s)\n",
__LINE__,dir_name,strerror(errno));
ost_count = 0;
}

err_out:
if (path_dup != NULL) NCI_Free(path_dup);

return ost_count;
}

#else

/*----< get_total_avail_osts() >---------------------------------------------*/
static
int get_total_avail_osts(const char *filename)
Expand Down Expand Up @@ -192,6 +238,7 @@ int get_total_avail_osts(const char *filename)

return num_members;
}
#endif

static
int compare(const void *a, const void *b)
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