Excerpts from Tomas Zvala's message of 2011-02-20 06:06:42 -0500: > On 18.2.2011 21:18, Chris Mason wrote: > > Ok, so it isn't part of the open devices code that prints errors, my > > guess is we're failing to read a good super. > > > > Could you please mkfs.btrfs /dev/xxx, sync, then btrfsck /dev/xxx, I want > > to make sure things are really getting written. > > > > Here's a patch that makes sure we have a good bdev after scanning, > > hopefully it will let us debug things without your box going boom. > > > > -chris > > > > > Hello Chris, > I patched the kernel, recompiled and installed, but I don't see the > message in the kernel log. I forgot to mention before, that > max_hw_sectors_kb and thus max_sectors_kb is 4096. ok, more below. > > Linux stg-top 2.6.37stg #7 SMP Sun Feb 20 10:48:57 CET 2011 x86_64 > Intel(R) Xeon(R) CPU E5620 @ 2.40GHz GenuineIntel GNU/Linux > > > With default max_sectors_kb = 512 > mkfs, sync, btrfsck going through fine > first mount is fine > > [112005]stg-top ~ # cat /sys/block/sdb/queue/max_sectors_kb > 512 > [112012]stg-top ~ # mkfs.btrfs /dev/sdb > > WARNING! - Btrfs Btrfs v0.19 IS EXPERIMENTAL > WARNING! - see http://btrfs.wiki.kernel.org before using > > fs created label (null) on /dev/sdb > nodesize 4096 leafsize 4096 sectorsize 4096 size 2.73TB > Btrfs Btrfs v0.19 > [112045]stg-top ~ # sync > [112046]stg-top ~ # btrfsck /dev/sdb > found 28672 bytes used err is 0 > total csum bytes: 0 > total tree bytes: 28672 > total fs tree bytes: 8192 > btree space waste bytes: 23875 > file data blocks allocated: 0 > referenced 0 > Btrfs Btrfs v0.19 > [112050]stg-top ~ # mount /dev/sdb /mnt/ > [112054]stg-top ~ # df /mnt/ > Filesystem 1K-blocks Used Available Use% Mounted on > /dev/sdb 2929685760 56 2927559936 1% /mnt > [112057]stg-top ~ # umount /mnt > > > With max_sectors_kb = 4096 > mkfs, sync, btrfsck is fine > second mount BUGs out > > [112100]stg-top ~ # echo 4096 > /sys/block/sdb/queue/max_sectors_kb > [112107]stg-top ~ # mkfs.btrfs /dev/sdb > > WARNING! - Btrfs Btrfs v0.19 IS EXPERIMENTAL > WARNING! - see http://btrfs.wiki.kernel.org before using > > fs created label (null) on /dev/sdb > nodesize 4096 leafsize 4096 sectorsize 4096 size 2.73TB > Btrfs Btrfs v0.19 > [112113]stg-top ~ # sync > [112117]stg-top ~ # btrfsck /dev/sdb > found 28672 bytes used err is 0 > total csum bytes: 0 > total tree bytes: 28672 > total fs tree bytes: 8192 > btree space waste bytes: 23875 > file data blocks allocated: 0 > referenced 0 > Btrfs Btrfs v0.19 > [112123]stg-top ~ # mount /dev/sdb /mnt/ > Killed At this point, your box is broken. You have to reboot before anything new is valid (sorry). Could you please: Set max_sectors_kb to 4096 mkfs.btrfs /dev/xxx sync echo 3 > /proc/sys/vm/drop_caches btrfsck /dev/xxx Don't try and mount, clearly my patch isn't saving us. -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
