On Sun, 2009-04-12 at 02:03 +0200, Harald Glatt wrote: > Hi, > > I have set up a btrfs within a 200 GB file that I mount via -o loop. > > It worked fine so far but today it crashed when there was alot of > concurrent writing/reading going on. > I'm testing it with a torrent client, so the data is really irrelevant > - but it's a good amount of stress. > Loopback is somewhat tricky because the kernel loopback driver only writes into the page cache of the underlying file in the host filesystem. So, the filesystem inside the loopback file thinks it has written things to disk but in reality it is just in cache. If you crash in the middle of all of this, you're going to see significant corruptions of the FS inside the loopback file. -chris -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
