From 3a29b5c442da55ff1a05025b769ba8e384429d2e Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@newdream.net>
Date: Tue, 2 Feb 2010 15:28:19 -0800
Subject: [PATCH] filestore: (try to) warn if not btrfs or ext3

This can't distinguish between ext3 and ext4, still, and ext4 won't
work (because fsync(whatever) doesn't flush the whole journal).  Bleh.
---
 src/os/FileStore.cc | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/os/FileStore.cc b/src/os/FileStore.cc
index 7f1298ce09218..d810913c53f91 100644
--- a/src/os/FileStore.cc
+++ b/src/os/FileStore.cc
@@ -506,6 +506,18 @@ int FileStore::mount()
 	   << "        filestore journal writeahead = true\n"
 	   << TEXT_NORMAL;
     }
+
+    // ext3?
+    struct statfs buf;
+    int r = ::statfs(basedir.c_str(), &buf);
+    if (r == 0 && buf.f_type != 0xEF53 /*EXT3_SUPER_MAGIC*/) {
+      dout(0) << "mount WARNING: not btrfs or ext3; data may be lost" << dendl;
+      cerr << TEXT_YELLOW
+	   << " ** WARNING: not btrfs or ext3.  We don't currently support file systems other\n"
+	   << "             than btrfs and ext3 (data=journal or data=ordered).  Data may be\n"
+	   << "             lost in the event of a crash.\n"
+	   << TEXT_NORMAL;
+    }    
   }
 
   if (!journal && g_conf.filestore_max_sync_interval > 2.0) {
-- 
2.39.5