Add dedup prefetch/prune support in py-libzfs

libzfs.pyx

@@ -3396,6 +3396,17 @@ cdef class ZFSPool(object):
 
         self.root.write_history('zpool upgrade', self.name)
 
+    def prefetch(self):
+        cdef int ret
+
+        with nogil:
+            ret = libzfs.zpool_prefetch(self.handle, zfs.ZPOOL_PREFETCH_DDT)
+
+        if ret != 0:
+            raise self.root.get_error()
+
+        self.root.write_history('zpool prefetch -t ddt', self.name)
+
 
 cdef class ZFSImportablePool(ZFSPool):
     cdef NVList nvlist

pxd/libzfs.pxd

@@ -629,6 +629,9 @@ cdef extern from "libzfs.h" nogil:
     extern int zmount(const char *, const char *, int, char *, char *, int, char *,
         int)
 
+    extern int zpool_prefetch(zpool_handle_t *, zfs.zpool_prefetch_type_t);
+    extern int zpool_ddt_prune(zpool_handle_t *, zfs.zpool_ddt_prune_unit_t, uint64_t)
+
     IF HAVE_ZFS_FOREACH_MOUNTPOINT:
         extern void zfs_foreach_mountpoint(
             libzfs_handle_t *, zfs_handle_t **, size_t, zfs_iter_f, void*, boolean_t

pxd/zfs.pxd

@@ -115,6 +115,15 @@ cdef extern from "sys/fs/zfs.h" nogil:
             ZPOOL_WAIT_TRIM,
             ZPOOL_WAIT_NUM_ACTIVITIES
 
+    ctypedef enum zpool_prefetch_type_t:
+        ZPOOL_PREFETCH_NONE
+        ZPOOL_PREFETCH_DDT
+
+    ctypedef enum zpool_ddt_prune_unit_t:
+        ZPOOL_DDT_PRUNE_NONE
+        ZPOOL_DDT_PRUNE_AGE
+        ZPOOL_DDT_PRUNE_PERCENTAGE
+
     enum:
         ZIO_TYPES
         ZFS_NUM_USERQUOTA_PROPS