2.6.27-stable review patch. If anyone has any objections, please let us know. ------------------ From: Mikulas Patocka <mpatocka@redhat.com> commit 7acedc5b98a2fcff64f00c21110aae7d3ac2f7df upstream We must zero the next chunk on disk *before* writing out the current chunk, not after. Otherwise if the machine crashes at the wrong time, the "end of metadata" marker may be missing. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- drivers/md/dm-exception-store.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) --- a/drivers/md/dm-exception-store.c +++ b/drivers/md/dm-exception-store.c @@ -603,17 +603,22 @@ static void persistent_commit(struct exc return; /* + * If we completely filled the current area, then wipe the next one. + */ + if ((ps->current_committed == ps->exceptions_per_area) && + zero_disk_area(ps, ps->current_area + 1)) + ps->valid = 0; + + /* * Commit exceptions to disk. */ - if (area_io(ps, WRITE)) + if (ps->valid && area_io(ps, WRITE)) ps->valid = 0; /* * Advance to the next area if this one is full. */ if (ps->current_committed == ps->exceptions_per_area) { - if (zero_disk_area(ps, ps->current_area + 1)) - ps->valid = 0; ps->current_committed = 0; ps->current_area++; zero_memory_area(ps); -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/