Ahh good hint!
If we take a look at xen-3.4.0/tools/libfsimage/zfs/fsys_zfs.c
it has two tests for versions:
if (uber->ub_magic == UBERBLOCK_MAGIC &&
uber->ub_version > 0 && uber->ub_version <= SPA_VERSION)
return (0);
if ((errnum = zap_lookup(ffi, dn, ZPL_VERSION_STR, &version, stack)))
return (errnum);
if (version > ZPL_VERSION)
return (-1);
Where both versions, on b134 and b151 differ:
#define ZPL_VERSION_4 4ULL
#define ZPL_VERSION ZPL_VERSION_4
#define SPA_VERSION_22 22ULL
#define SPA_VERSION SPA_VERSION_22
#define ZPL_VERSION_5 5ULL
#define ZPL_VERSION ZPL_VERS
#define SPA_VERSION SPA_VERSION_31
#define SPA_VERSION_STRING "31"
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