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From: Kai Hendry <hendry@iki.fi>
To: Qu Wenruo <quwenruo.btrfs@gmx.com>
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Subject: Re: USB upgrade fun
Date: Sun, 29 Oct 2017 11:20:55 +0800
Sender: linux-btrfs-owner@vger.kernel.org
List-ID: <linux-btrfs.vger.kernel.org>

On Sat, 28 Oct 2017, at 03:58 PM, Qu Wenruo wrote:
> Don't get confused with the name, to use "fix-dev-size" you need to run
> "btrfs rescue fix-dev-size"

[hendry@nuc btrfs-progs]$ sudo ./btrfs rescue fix-device-size /dev/sdc1
warning, device 2 is missing
ERROR: devid 2 is missing or not writeable
ERROR: fixing device size needs all device(s) present and writeable
[hendry@nuc btrfs-progs]$ lsblk -f
NAME   FSTYPE LABEL    UUID                                 MOUNTPOINT
sda
├─sda1 vfat            0C95-8576                            /boot
└─sda2 btrfs           c5f98288-5ab3-4236-b00e-f2cd15c0616d /
sdb
sdc
└─sdc1 btrfs  extraid1 5cab2a4a-e282-4931-b178-bec4c73cdf77
[hendry@nuc btrfs-progs]$ lsblk -f
NAME   FSTYPE LABEL    UUID                                 MOUNTPOINT
sda
├─sda1 vfat            0C95-8576                            /boot
└─sda2 btrfs           c5f98288-5ab3-4236-b00e-f2cd15c0616d /
sdb
└─sdb1 btrfs  extraid1 5cab2a4a-e282-4931-b178-bec4c73cdf77
sdc
└─sdc1 btrfs  extraid1 5cab2a4a-e282-4931-b178-bec4c73cdf77
[hendry@nuc btrfs-progs]$ sudo ./btrfs rescue fix-device-size /dev/sdc1
Couldn't setup extent tree
Couldn't setup device tree
ERROR: could not open btrfs
[hendry@nuc btrfs-progs]$ sudo ./btrfs rescue fix-device-size /dev/sdb1
leaf parent key incorrect 1320477425664
ERROR: could not open btrfs
[hendry@nuc btrfs-progs]$ sudo mount -o degraded /dev/sdb1 /mnt/raid1/
mount: /mnt/raid1: wrong fs type, bad option, bad superblock on
/dev/sdb1, missing codepage or helper program, or other error.


Still unable to mount. Damn. Maybe I'm chasing a red herring? Here are
the relevant kernel logs:

Oct 29 10:56:45 nuc kernel: sd 2:0:0:0: [sdb] Attached SCSI disk
Oct 29 10:57:32 nuc kernel: BTRFS info (device sdc1): allowing degraded
mounts
Oct 29 10:57:32 nuc kernel: BTRFS info (device sdc1): disk space caching
is enabled
Oct 29 10:57:32 nuc kernel: BTRFS info (device sdc1): has skinny extents
Oct 29 10:57:33 nuc kernel: BTRFS error (device sdc1): super_total_bytes
4000795746304 mismatch with fs_devices total_rw_bytes 4000795749888
Oct 29 10:57:33 nuc kernel: BTRFS error (device sdc1): failed to read
chunk tree: -22
Oct 29 10:57:33 nuc kernel: BTRFS error (device sdc1): open_ctree failed


Nonetheless if I reboot to 4.4, I can still mount. However my root is
bizarrely out of space or inodes so journalctl et al is unusable.


Kind regards,