On Wed, Jun 28, 2017 at 01:43:29PM +0800, Qu Wenruo wrote: > The patchset can be fetched from my github repo: > https://github.com/adam900710/linux/tree/degradable > > The patchset is based on David's for-4.13-part1 branch. > > Btrfs currently uses num_tolerated_disk_barrier_failures to do global > check for tolerated missing device. > > Although the one-size-fit-all solution is quite safe, it's too strict > if data and metadata has different duplication level. > > For example, if one use Single data and RAID1 metadata for 2 disks, it > means any missing device will make the fs unable to be degraded > mounted. > > But in fact, some times all single chunks may be in the existing > device and in that case, we should allow it to be rw degraded mounted. > > Such case can be easily reproduced using the following script: > # mkfs.btrfs -f -m raid1 -d sing /dev/sdb /dev/sdc > # wipefs -f /dev/sdc > # mount /dev/sdb -o degraded,rw I've seen wider testing coverage in replies to the previous patchset iterations. Can we have that added to fstests? I'm going to add this patchset to the devel queue (ie. not a separate for-next branch anymore). -- 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
