On Thu, Aug 21, 2008 at 08:48:15PM +0530, Aneesh Kumar K.V wrote: > > I have a feeling that we did not try very hard before invalidate the > > dirty page which fail to map to disks. Perhaps we should try a few more > > times before give up. Also in that case, perhaps we should turn off > > delalloc fs wide, so the new writers won't take the subsequently made > > avaible free blocks away from this unlucky delalloc da writepages. > > How do we try hard ? The mballoc already try had to allocate blocks. So I > am not sure what do we achieve by requesting for block allocation again. So here's the problem that we face. If we have a situation where the disk fills temporarily, but then subsequently space gets freed up, it would be preferable if the dirty page isn't invalidated, and so periodically (or perhaps via "there's-free-space-now notifier") we retry the delayed allocation so we don't lose data during a transient disk full situation. But at the same time, we don't want an fsync() on the entire filesystem, or a umount on the filesystem, to hang forever. - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
