On Tue, 2015-07-21 at 23:56 -0400, Theodore Ts'o wrote:
quoted
v2: Updated for MS_CGROUPWB -> SB_I_CGROUPWB.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: <redacted>
Thanks, applied.
Hi, this patch introduces a regression - a major one, I'd say.
Symptoms: copy a bunch of file, run sync, then run 'reboot', and after
you boot up the copied files are corrupted. So basically the user
-visible symptom is that 'sync' does not work.
I quite an effort to bisect it, but it led me to this patch.
If I take the latest upstream (v4.3-rc2+), and revert this patch:
001e4a8 ext4: imlpement cgroup writeback support
then the problem goes away - files are not corrupted after reboot.
I use ext4 on top of a "bare" partition, no LVM or dm layers involved.
I use Fedora 22 with all the latest package updates, and I only change
the kernel there.
The corruption seems to be that the start with a bunch of zeroes
instead of the real data, but I did not check carefully, looked only at
one file briefly.
Artem.