first off: this was just junk data, and is all readable in degraded
mode anyway.
Label: 'ROOT' uuid: cc80d150-af98-4af4-bc68-c8df352bda4f
Total devices 2 FS bytes used 138.00GB
devid 1 size 232.79GB used 189.04GB path /dev/sdc2
devid 3 size 232.89GB used 14.06GB path /dev/sdb
The filesystem was created in 3.6 or so, and abandoned when I moved to
a SSD as my main root. Playing around with it, I added a raw disk to
it and did some IO but wanted that disk back. Due to the automatic
upgrade to 'dup' when adding a second device, I couldn't do a btrfs
dev delete so I ended up just unmounting it and reformatting /dev/sdb
as a backup for my SSD.
Given the 'dup' profile, I should be able to just blow away the stub
of sdb and continue using sdc, but I can't figure out any way to get
it to allow that.
$ uname -a
$ uname -a
Linux wolf 3.8.0-rc5-dan #3 SMP PREEMPT Tue Jan 29 00:55:14 EST 2013
x86_64 GNU/Linux
(I forgot to remove extraversion, git is clean 3.8-rc5)
$ sudo mount -o degraded /dev/sdc2 /mnt/t2
mount: wrong fs type, bad option, bad superblock on /dev/sdc2,
$ dmesg | tail
[1648243.075565] device label ROOT devid 1 transid 15051 /dev/sdc2
[1648243.076531] btrfs: allowing degraded mounts
[1648243.076539] btrfs: disk space caching is enabled
[1648243.891735] Btrfs: too many missing devices, writeable mount is not allowed
[1648243.898122] btrfs: open_ctree failed
$ sudo mount -o degraded,ro /dev/sdc2 /mnt/t2
$ dmesg | tail
[1648331.898660] device label ROOT devid 1 transid 15051 /dev/sdc2
[1648331.900371] btrfs: allowing degraded mounts
[1648331.900380] btrfs: disk space caching is enabled
$ sudo btrfs dev del missing /mnt/t2
ERROR: error removing the device 'missing' - Read-only file system
$ sudo btrfs dev add /dev/loop0 /mnt/t2
ERROR: error adding the device '/dev/loop0' - Read-only file system
$ sudo umount /mnt/t2
$ sudo ./btrfsck --repair /dev/sdc2
[sudo] password for harik:
enabling repair mode
ERROR: device scan failed '/dev/sdb' - Device or resource busy
ERROR: device scan failed '/dev/sdb' - Device or resource busy
Check tree block failed, want=211559927808, have=0
Check tree block failed, want=211559927808, have=0
Check tree block failed, want=211644346368, have=3611932269563901032
Check tree block failed, want=211644346368, have=3611932269563901032
Check tree block failed, want=211559563264, have=70368744177680
Check tree block failed, want=211559563264, have=70368744177680
Check tree block failed, want=211641229312, have=2308722807962755443
Check tree block failed, want=211641229312, have=2308722807962755443
Check tree block failed, want=211640909824, have=651398145056990559
Check tree block failed, want=211640909824, have=651398145056990559
Checking filesystem on /dev/sdc2
UUID: cc80d150-af98-4af4-bc68-c8df352bda4f
checking extents
Check tree block failed, want=212375867392, have=3431074926722403215
<thousands of these>
Check tree block failed, want=211559571456, have=15880152022637367237
checking root refs
btrfsck: extent-tree.c:2553: btrfs_reserve_extent: Assertion `!(ret)' failed.
btrfsck is from btrfs-progs master, g7854c8b66
So I can't mount RW because I only have one active disk, I can't add a
new one, and I can't remove the missing disk. This seems somewhat
awkward, if using 2-disk BTRFS and a drive dies, how do you replace &
recover?
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