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Hi, We are trying to use OCFS2 as VM storage. After running into problems with qemu's disk_mirror feature we now think there could be a problem with the FIEMAP ioctl in OCFS2. As far as I understand the situation looks like this: Qemu inquiries the FS if the given section of the image is already allocated via the FIEMAP ioctl [1] It especially checks if fm_mapped_extents is greater 0.

...ntel.com> David Sterba <dsterba@suse.cz> David Stevenson <david@avoncliff.com> David Teigland <teigland@redhat.com> David Turvene <dturvene@dahetral.com> David Vrabel <david.vrabel@citrix.com> David Ward <david.ward@ll.mit.edu> David Weber <wb@munzinger.de> David Woodhouse <David.Woodhouse@intel.com> David Woodhouse <dwmw2@infradead.org> David Zafman <david.zafman@inktank.com> Davide Ciminaghi <ciminaghi@gnudd.com> Davide Gerhard <rainbow@irh.it> Davidlohr Bueso <dave@gnu.org> Davidlohr Bueso &l...

...ntel.com> David Sterba <dsterba@suse.cz> David Stevenson <david@avoncliff.com> David Teigland <teigland@redhat.com> David Turvene <dturvene@dahetral.com> David Vrabel <david.vrabel@citrix.com> David Ward <david.ward@ll.mit.edu> David Weber <wb@munzinger.de> David Woodhouse <David.Woodhouse@intel.com> David Woodhouse <dwmw2@infradead.org> David Zafman <david.zafman@inktank.com> Davide Ciminaghi <ciminaghi@gnudd.com> Davide Gerhard <rainbow@irh.it> Davidlohr Bueso <dave@gnu.org> Davidlohr Bueso &l...

Hi, as far as I understand the current situation with locking looks like this: - o2cb supports cluster-aware flock(2). fcntl(2) locks are only local. - Pacemaker and cman also support cluster-aware fcntl(2) - There is no way for a userspace program to check if fcntl(2) is cluster- aware or not Is this correct? We would like to stick with the o2cb cluster stack but there are applications like

Hi, we ran into a BUG() in ocfs2_get_clusters_nocache: [Fri Oct 18 10:52:28 2013] ------------[ cut here ]------------ [Fri Oct 18 10:52:28 2013] Kernel BUG at ffffffffa028ad5a [verbose debug info unavailable] [Fri Oct 18 10:52:28 2013] invalid opcode: 0000 [#1] SMP [Fri Oct 18 10:52:28 2013] Modules linked in: vhost_net vhost macvtap macvlan drbd ip6table_filter ip6_tables iptable_filter