On 27/11/17 16:06, gregkh@xxxxxxxxxxxxxxxxxxx wrote:
This is a note to let you know that I've just added the patch titled
bcache: only permit to recovery read error when cache device is clean
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bcache-only-permit-to-recovery-read-error-when-cache-device-is-clean.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
Hi Greg,
This patch is an important fix for a possible data corruption issue, but
it also introduces a bug that can produce read errors under certain
circumstances. The issue introduced by this patch is not as severe as
the issue it fixes, but can lead to e.g. upper layer fs remounting read
only. In my environment upper layer handled it badly and indirectly
resulted in data loss (not directly bcache's fault of course).
Michael Lyle CC'd the stable list with a follow up fix for the issue
introduced by this patch, on 24th Nov, subject "bcache: recover data
from backing when data is clean".
However, the followup fix is not in Linus' tree yet, only in Michael's.
I guess that means you can't pick it up yet. Never-the-less I felt it
important to point this out here.
thanks,
Eddie