diff --git a/remotefilelog/__init__.py b/remotefilelog/__init__.py
--- a/remotefilelog/__init__.py
+++ b/remotefilelog/__init__.py
@@ -992,13 +992,16 @@
 @command('repack', [
      ('', 'background', None, _('run in a background process'), None),
      ('', 'incremental', None, _('do an incremental repack'), None),
+     ('', 'packsonly', None, _('only repack packs (skip loose objects)'), None),
     ], _('hg repack [OPTIONS]'))
 def repack(ui, repo, *pats, **opts):
     if opts.get('background'):
         repackmod.backgroundrepack(repo, incremental=opts.get('incremental'))
         return
 
+    options = {'packsonly': opts.get('packsonly')}
+
     if opts.get('incremental'):
-        repackmod.incrementalrepack(repo)
+        repackmod.incrementalrepack(repo, options=options)
     else:
-        repackmod.fullrepack(repo)
+        repackmod.fullrepack(repo, options=options)
diff --git a/remotefilelog/basepack.py b/remotefilelog/basepack.py
--- a/remotefilelog/basepack.py
+++ b/remotefilelog/basepack.py
@@ -161,7 +161,7 @@
 
         return missing
 
-    def markledger(self, ledger):
+    def markledger(self, ledger, options=None):
         for pack in self.packs:
             pack.markledger(ledger)
 
@@ -281,7 +281,7 @@
     def getmissing(self, keys):
         raise NotImplemented()
 
-    def markledger(self, ledger):
+    def markledger(self, ledger, options=None):
         raise NotImplemented()
 
     def cleanup(self, ledger):
diff --git a/remotefilelog/basestore.py b/remotefilelog/basestore.py
--- a/remotefilelog/basestore.py
+++ b/remotefilelog/basestore.py
@@ -3,6 +3,7 @@
 import errno, hashlib, heapq, os, shutil, time
 
 from . import (
+    constants,
     shallowutil,
 )
 
@@ -55,7 +56,9 @@
 
     # BELOW THIS ARE IMPLEMENTATIONS OF REPACK SOURCE
 
-    def markledger(self, ledger):
+    def markledger(self, ledger, options=None):
+        if options and options.get(constants.OPTION_PACKSONLY):
+            return
         if self._shared:
             for filename, nodes in self._getfiles():
                 for node in nodes:
diff --git a/remotefilelog/constants.py b/remotefilelog/constants.py
--- a/remotefilelog/constants.py
+++ b/remotefilelog/constants.py
@@ -30,3 +30,6 @@
         return _("files")
     if category == TREEPACK_CATEGORY:
         return _("trees")
+
+# Repack options passed to ``marledger``.
+OPTION_PACKSONLY = 'packsonly'
diff --git a/remotefilelog/contentstore.py b/remotefilelog/contentstore.py
--- a/remotefilelog/contentstore.py
+++ b/remotefilelog/contentstore.py
@@ -127,9 +127,9 @@
         else:
             raise RuntimeError("no writable store configured")
 
-    def markledger(self, ledger):
+    def markledger(self, ledger, options=None):
         for store in self.stores:
-            store.markledger(ledger)
+            store.markledger(ledger, options)
 
     def markforrefresh(self):
         for store in self.stores:
@@ -219,7 +219,7 @@
     def getmissing(self, keys):
         return keys
 
-    def markledger(self, ledger):
+    def markledger(self, ledger, options=None):
         pass
 
 class manifestrevlogstore(object):
@@ -301,7 +301,9 @@
         self._repackstartlinkrev = startrev
         self._repackendlinkrev = endrev
 
-    def markledger(self, ledger):
+    def markledger(self, ledger, options=None):
+        if options and options.get(constants.OPTION_PACKSONLY):
+            return
         treename = ''
         rl = revlog.revlog(self._svfs, '00manifesttree.i')
         startlinkrev = self._repackstartlinkrev
diff --git a/remotefilelog/datapack.py b/remotefilelog/datapack.py
--- a/remotefilelog/datapack.py
+++ b/remotefilelog/datapack.py
@@ -223,7 +223,7 @@
 
         return struct.unpack(self.INDEXFORMAT, entry)
 
-    def markledger(self, ledger):
+    def markledger(self, ledger, options=None):
         for filename, node in self:
             ledger.markdataentry(self, filename, node)
 
@@ -323,7 +323,7 @@
     def add(self, name, node, data):
         raise RuntimeError("cannot add to datapack (%s:%s)" % (name, node))
 
-    def markledger(self, ledger):
+    def markledger(self, ledger, options=None):
         for filename, node in self:
             ledger.markdataentry(self, filename, node)
 
diff --git a/remotefilelog/historypack.py b/remotefilelog/historypack.py
--- a/remotefilelog/historypack.py
+++ b/remotefilelog/historypack.py
@@ -270,7 +270,7 @@
                     endnode = midnode
         return None
 
-    def markledger(self, ledger):
+    def markledger(self, ledger, options=None):
         for filename, node in self:
             ledger.markhistoryentry(self, filename, node)
 
diff --git a/remotefilelog/metadatastore.py b/remotefilelog/metadatastore.py
--- a/remotefilelog/metadatastore.py
+++ b/remotefilelog/metadatastore.py
@@ -96,9 +96,9 @@
                 missing = store.getmissing(missing)
         return missing
 
-    def markledger(self, ledger):
+    def markledger(self, ledger, options=None):
         for store in self.stores:
-            store.markledger(ledger)
+            store.markledger(ledger, options)
 
     def getmetrics(self):
         metrics = [s.getmetrics() for s in self.stores]
@@ -143,5 +143,5 @@
     def getmissing(self, keys):
         return keys
 
-    def markledger(self, ledger):
+    def markledger(self, ledger, options=None):
         pass
diff --git a/remotefilelog/repack.py b/remotefilelog/repack.py
--- a/remotefilelog/repack.py
+++ b/remotefilelog/repack.py
@@ -36,9 +36,12 @@
     repo.ui.warn(msg)
     runshellcommand(cmd, os.environ)
 
-def fullrepack(repo):
+def fullrepack(repo, options=None):
+    """If ``packsonly`` is True, stores creating only loose objects are skipped.
+    """
     if util.safehasattr(repo, 'shareddatastores'):
-        datasource = contentstore.unioncontentstore(*repo.shareddatastores)
+        datasource = contentstore.unioncontentstore(
+            *repo.shareddatastores)
         historysource = metadatastore.unionmetadatastore(
             *repo.sharedhistorystores,
             allowincomplete=True)
@@ -47,11 +50,11 @@
             repo,
             constants.FILEPACK_CATEGORY)
         _runrepack(repo, datasource, historysource, packpath,
-                   constants.FILEPACK_CATEGORY)
+                   constants.FILEPACK_CATEGORY, options=options)
 
     if repo.ui.configbool('treemanifest', 'server'):
         treemfmod = extensions.find('treemanifest')
-        treemfmod.serverrepack(repo)
+        treemfmod.serverrepack(repo, options=options)
     elif util.safehasattr(repo.manifestlog, 'datastore'):
         localdata, shareddata = _getmanifeststores(repo)
         lpackpath, ldstores, lhstores = localdata
@@ -63,7 +66,7 @@
                         *shstores,
                         allowincomplete=True)
         _runrepack(repo, datasource, historysource, spackpath,
-                   constants.TREEPACK_CATEGORY)
+                   constants.TREEPACK_CATEGORY, options=options)
 
         # Repack the local manifest store
         datasource = contentstore.unioncontentstore(
@@ -73,10 +76,10 @@
                         *lhstores,
                         allowincomplete=True)
         _runrepack(repo, datasource, historysource, lpackpath,
-                   constants.TREEPACK_CATEGORY)
+                   constants.TREEPACK_CATEGORY, options=options)
 
 
-def incrementalrepack(repo):
+def incrementalrepack(repo, options=None):
     """This repacks the repo by looking at the distribution of pack files in the
     repo and performing the most minimal repack to keep the repo in good shape.
     """
@@ -88,7 +91,8 @@
                            repo.shareddatastores,
                            repo.sharedhistorystores,
                            packpath,
-                           constants.FILEPACK_CATEGORY)
+                           constants.FILEPACK_CATEGORY,
+                           options=options)
 
     if repo.ui.configbool('treemanifest', 'server'):
         treemfmod = extensions.find('treemanifest')
@@ -103,7 +107,8 @@
                            sdstores,
                            shstores,
                            spackpath,
-                           constants.TREEPACK_CATEGORY)
+                           constants.TREEPACK_CATEGORY,
+                           options=options)
 
         # Repack the local manifest store
         _incrementalrepack(repo,
@@ -111,7 +116,8 @@
                            lhstores,
                            lpackpath,
                            constants.TREEPACK_CATEGORY,
-                           allowincompletedata=True)
+                           allowincompletedata=True,
+                           options=options)
 
 def _getmanifeststores(repo):
     shareddatastores = repo.manifestlog.shareddatastores
@@ -142,7 +148,7 @@
     return packs
 
 def _incrementalrepack(repo, datastore, historystore, packpath, category,
-        allowincompletedata=False):
+        allowincompletedata=False, options=None):
     shallowutil.mkstickygroupdir(repo.ui, packpath)
 
     files = osutil.listdir(packpath, stat=True)
@@ -179,7 +185,8 @@
                packpath, category,
                fullhistory=metadatastore.unionmetadatastore(
                    *allhistorypacks,
-                   allowincomplete=True))
+                   allowincomplete=True),
+                options=options)
 
 def _computeincrementaldatapack(ui, files):
     """Given a set of pack files and a set of generation size limits, this
@@ -284,7 +291,8 @@
 
     return chosenpacks
 
-def _runrepack(repo, data, history, packpath, category, fullhistory=None):
+def _runrepack(repo, data, history, packpath, category, fullhistory=None,
+               options=None):
     shallowutil.mkstickygroupdir(repo.ui, packpath)
 
     def isold(repo, filename, node):
@@ -305,8 +313,7 @@
     if not fullhistory:
         fullhistory = history
     packer = repacker(repo, data, history, fullhistory, category,
-                      gc=garbagecollect,
-                      isold=isold)
+                      gc=garbagecollect, isold=isold, options=options)
 
     # internal config: remotefilelog.datapackversion
     dv = repo.ui.configint('remotefilelog', 'datapackversion', 0)
@@ -385,13 +392,14 @@
     new format.
     """
     def __init__(self, repo, data, history, fullhistory, category, gc=False,
-                 isold=None):
+                 isold=None, options=None):
         self.repo = repo
         self.data = data
         self.history = history
         self.fullhistory = fullhistory
         self.unit = constants.getunits(category)
         self.garbagecollect = gc
+        self.options = options
         if self.garbagecollect:
             if not isold:
                 raise ValueError("Function 'isold' is not properly specified")
@@ -407,8 +415,8 @@
             self.repo.hook('prerepack')
 
             # Populate ledger from source
-            self.data.markledger(ledger)
-            self.history.markledger(ledger)
+            self.data.markledger(ledger, options=self.options)
+            self.history.markledger(ledger, options=self.options)
 
             # Run repack
             self.repackdata(ledger, targetdata)
diff --git a/remotefilelog/wirepack.py b/remotefilelog/wirepack.py
--- a/remotefilelog/wirepack.py
+++ b/remotefilelog/wirepack.py
@@ -221,7 +221,7 @@
             if count == 0 and filename == '':
                 break
 
-    def markledger(self, ledger):
+    def markledger(self, ledger, options=None):
         pass
 
     def cleanup(self, ledger):
diff --git a/tests/test-remotefilelog-repack.t b/tests/test-remotefilelog-repack.t
--- a/tests/test-remotefilelog-repack.t
+++ b/tests/test-remotefilelog-repack.t
@@ -82,6 +82,18 @@
   $TESTTMP/hgcache/master/packs/8e25dec685d5e0bb1f1b39df3acebda0e0d75c6e.datapack
   $TESTTMP/hgcache/repos
 
+# First assert that with --packsonly, the loose object will be ignored:
+
+  $ hg repack --packsonly
+
+  $ find $CACHEDIR -type f | sort
+  $TESTTMP/hgcache/master/11/f6ad8ec52a2984abaafd7c3b516503785c2072/d4a3ed9310e5bd9887e3bf779da5077efab28216
+  $TESTTMP/hgcache/master/packs/276d308429d0303762befa376788300f0310f90e.histidx
+  $TESTTMP/hgcache/master/packs/276d308429d0303762befa376788300f0310f90e.histpack
+  $TESTTMP/hgcache/master/packs/8e25dec685d5e0bb1f1b39df3acebda0e0d75c6e.dataidx
+  $TESTTMP/hgcache/master/packs/8e25dec685d5e0bb1f1b39df3acebda0e0d75c6e.datapack
+  $TESTTMP/hgcache/repos
+
   $ hg repack --traceback
 
   $ find $CACHEDIR -type f | sort
diff --git a/tests/test-treemanifest-repack.t b/tests/test-treemanifest-repack.t
--- a/tests/test-treemanifest-repack.t
+++ b/tests/test-treemanifest-repack.t
@@ -118,7 +118,10 @@
   $ ls_l .hg/store/packs/manifests | grep datapack
   -r--r--r--     248 5d1716bbef6e7200192de6509055d1ee31a4172c.datapack
   -r--r--r--     146 cffef142da32f3e52c1779490e5d0ddac5f9b82b.datapack
-  $ hg repack
+
+# As we only have packs, also test that --packsonly doesn't prevent packs from
+being repacked
+  $ hg repack --packsonly
   $ ls_l .hg/store/packs/manifests | grep datapack
   -r--r--r--     386 d15c09a9a5a13bb689bd9764455a415a20dc885e.datapack
 
@@ -185,6 +188,10 @@
   data/dir/b.i
   meta/dir/00manifest.i
 
+--packsonly shouldn't repack anything:
+  $ hg repack --packsonly
+  $ ls .hg/cache/packs/manifests
+
   $ hg repack
   $ ls .hg/cache/packs/manifests
   56e8c6f0ca2a324b8b5ca1a2730323a1b4d0793a.dataidx
diff --git a/treemanifest/__init__.py b/treemanifest/__init__.py
--- a/treemanifest/__init__.py
+++ b/treemanifest/__init__.py
@@ -1462,13 +1462,13 @@
     def getmissing(self, keys):
         return keys
 
-    def markledger(self, ledger):
+    def markledger(self, ledger, options=None):
         pass
 
     def getmetrics(self):
         return {}
 
-def serverrepack(repo, incremental=False):
+def serverrepack(repo, incremental=False, options=None):
     packpath = repo.vfs.join('cache/packs/%s' % PACK_CATEGORY)
 
     dpackstore = datapackstore(repo.ui, packpath)
@@ -1492,7 +1492,8 @@
         startrev = latestpackedlinkrev + 1
 
     revlogstore.setrepacklinkrevrange(startrev, endrev)
-    _runrepack(repo, datastore, histstore, packpath, PACK_CATEGORY)
+    _runrepack(repo, datastore, histstore, packpath, PACK_CATEGORY,
+        options=options)
 
 def striptrees(orig, repo, tr, striprev, files):
     if not treeenabled(repo.ui):