move remount from fs/btrfs to system/osi rockstor#1320

Not directly related to btrfs so moving to more general location.

src/rockstor/fs/btrfs.py

@@ -251,12 +251,6 @@ def umount_root(root_pool_mnt):
     return
 
 
-def remount(mnt_pt, mnt_options):
-    if (is_mounted(mnt_pt)):
-        run_command([MOUNT, '-o', 'remount,%s' % mnt_options, mnt_pt])
-    return True
-
-
 def is_subvol(mnt_pt):
     show_cmd = [BTRFS, 'subvolume', 'show', mnt_pt]
     o, e, rc = run_command(show_cmd, throw=False)

src/rockstor/storageadmin/views/pool.py

@@ -29,8 +29,9 @@
 from storageadmin.models import (Disk, Pool, Share, PoolBalance)
 from storageadmin.views import DiskMixin
 from fs.btrfs import (add_pool, pool_usage, resize_pool, umount_root,
-                      btrfs_uuid, mount_root, remount, get_pool_info,
+                      btrfs_uuid, mount_root, get_pool_info,
                       pool_raid, start_balance)
+from system.osi import remount
 from storageadmin.util import handle_exception
 from django.conf import settings
 import rest_framework_custom as rfc

src/rockstor/system/osi.py

@@ -382,6 +382,12 @@ def is_mounted(mnt_pt):
     return False
 
 
+def remount(mnt_pt, mnt_options):
+    if (is_mounted(mnt_pt)):
+        run_command([MOUNT, '-o', 'remount,%s' % mnt_options, mnt_pt])
+    return True
+
+
 def get_md_members(device_name, test=None):
     """
     Returns the md members from a given device, if the given device is not an