anaconda: enable discard option for dom0 filesystems by default

This may have performance impact on some older SSD, but on the other
hand, without this option it's pretty easy to fill the whole LVM thin
pool even if there is plenty free space in dom0.
Note that this doesn't enable it on LUKS layer, this is still disabled
by default.

Fixes QubesOS/qubes-issues#3226

anaconda/pyanaconda/install.py

@@ -211,6 +211,17 @@ def doInstall(storage, payload, ksdata, instClass):
                                                             wait_for_entropy=entropy_wait_clbk)
 
     turn_on_filesystems(storage, mount_only=flags.flags.dirInstall, callbacks=callbacks_reg)
+
+    # For autopart, actual partition related objects (especially
+    # blivet.format.FS objects) are created by the above call. And autopart
+    # does not provide any way to specify default mount options (unlike manual
+    # partitioning). Because of this, patch it now to add 'discard' option.
+    if storage.root_device.format.options and \
+            'discard' not in storage.root_device.format.options:
+        storage.root_device.format.options += ',discard'
+    else:
+        storage.root_device.format.options = 'defaults,discard'
+
     payload.writeStorageEarly()
 
     # Run %pre-install scripts with the filesystem mounted and no packages

anaconda/pyanaconda/kickstart.py

@@ -885,6 +885,10 @@ class LogVolData(commands.logvol.F23_LogVolData):
             self.mountpoint = ""
             ty = None
 
+        if self.mountpoint.startswith('/') and not self.fsopts:
+            # enable discard for normal filesystems in dom0
+            self.fsopts = "defaults,discard"
+
         # Sanity check mountpoint
         if self.mountpoint != "" and self.mountpoint[0] != '/':
             raise KickstartParseError(formatErrorMsg(self.lineno,
@@ -1245,6 +1249,10 @@ class PartitionData(commands.partition.F23_PartData):
             else:
                 ty = storage.default_fstype
 
+        if self.mountpoint.startswith('/') and not self.fsopts:
+            # enable discard for normal filesystems in dom0
+            self.fsopts = "defaults,discard"
+
         if not size and self.size:
             try:
                 size = Size("%d MiB" % self.size)
@@ -1490,6 +1498,10 @@ class RaidData(commands.raid.F25_RaidData):
             else:
                 ty = storage.default_fstype
 
+        if self.mountpoint.startswith('/') and not self.fsopts:
+            # enable discard for normal filesystems in dom0
+            self.fsopts = "defaults,discard"
+
         # Sanity check mountpoint
         if self.mountpoint != "" and self.mountpoint[0] != '/':
             raise KickstartParseError(formatErrorMsg(self.lineno,