Ignore fast_dedup feature

libzfs.pyx

@@ -29,6 +29,18 @@ include "config.pxi"
 include "nvpair.pxi"
 include "converter.pxi"
 
+IGNORED_FEATURES = {'fast_dedup'}
+
+
+def all_features():
+    for i in range(0, zfs.SPA_FEATURES):
+        feat = &zfs.spa_feature_table[i]
+
+        if feat.fi_uname in IGNORED_FEATURES:
+            continue
+
+        yield feat
+
 
 class DatasetType(enum.IntEnum):
     FILESYSTEM = zfs.ZFS_TYPE_FILESYSTEM
@@ -1538,7 +1550,7 @@ cdef class ZFS(object):
 
         if enable_all_feat:
             opts = opts.copy()
-            for i in range(0, zfs.SPA_FEATURES):
+            for feat in all_features():
                 feat = &zfs.spa_feature_table[i]
                 opts['feature@{}'.format(feat.fi_uname)] = 'enabled'
 
@@ -3149,8 +3161,7 @@ cdef class ZFSPool(object):
 
             features_nv = NVList(nvl)
 
-            for i in range(0, zfs.SPA_FEATURES):
-                feat = &zfs.spa_feature_table[i]
+            for feat in all_features():
                 f = ZPoolFeature.__new__(ZPoolFeature)
                 f.feature = feat
                 f.pool = self