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Date: Thu, 20 Aug 2015 11:17:25 +0800
From: Anand Jain <anand.jain@oracle.com>
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To: E V <eliventer@gmail.com>, linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: Kernel 4.1.4 btrfs forced read-only during rsync
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two to dig more..

> Aug 16 04:41:31 [1082957.226817] BTRFS: error (device sdb) in
> __btrfs_free_extent:6235: errno=-28 No space left
> Aug 16 04:41:31 [1082957.226819] BTRFS info (device sdb): forced readonly

::

> Aug 16 04:41:31 [1082957.289289] BTRFS: error (device sdb) in
> cleanup_transaction:1692: errno=-5 IO failure

1.
  We probably need to understand what kicked in readonly. is it
  -28 (No space left) OR -5 (EIO).

2.
  There are no media errors from the block layer, hope we are not
  fabricating the EIO in the FS layer... thats wrong.

digging more.

Thanks,  Anand