On Tue, 15 Dec 2015, Oliver Neukum wrote:
> On Thu, 2015-12-03 at 13:36 -0500, Alan Stern wrote:
> > This is an old problem, but it was never resolved and it still affects
> > people (Bugzilla #89511). In short, there are USB-(S)ATA bridges that
> > claim to be write-back but don't support the SY
On Thu, 2015-12-03 at 13:36 -0500, Alan Stern wrote:
> This is an old problem, but it was never resolved and it still affects
> people (Bugzilla #89511). In short, there are USB-(S)ATA bridges that
> claim to be write-back but don't support the SYNCHRONIZE CACHE
> command.
> This causes errors w
This is an old problem, but it was never resolved and it still affects
people (Bugzilla #89511). In short, there are USB-(S)ATA bridges that
claim to be write-back but don't support the SYNCHRONIZE CACHE command.
This causes errors when filesystems try to flush data out to the disk.
On Mon, 22
On Mon, 22 Jun 2015, James Bottomley wrote:
> On Mon, 2015-06-22 at 13:48 -0400, Alan Stern wrote:
> > On Mon, 22 Jun 2015, James Bottomley wrote:
> >
> > > On Mon, 2015-06-22 at 13:30 -0400, Alan Stern wrote:
> > > > On Mon, 22 Jun 2015, James Bottomley wrote:
> > > >
> > > > > I'm not sure I e
On Jun 26 James Bottomley wrote:
> On Fri, 2015-06-26 at 11:43 +0200, Stefan Richter wrote:
> > On Jun 22 James Bottomley wrote:
[...]
> > > Perhaps it might be wise to do this to every USB device ... for external
> > > devices, the small performance gain doesn't really make up for the
> > > potent
On Fri, 2015-06-26 at 11:43 +0200, Stefan Richter wrote:
> On Jun 22 James Bottomley wrote:
> > On Mon, 2015-06-22 at 13:30 -0400, Alan Stern wrote:
> > > On Mon, 22 Jun 2015, James Bottomley wrote:
> > > > Obviously, for a disk with a writeback cache that can't do flush, that
> > > > window is muc
On Jun 22 James Bottomley wrote:
> On Mon, 2015-06-22 at 13:30 -0400, Alan Stern wrote:
> > On Mon, 22 Jun 2015, James Bottomley wrote:
> > > Obviously, for a disk with a writeback cache that can't do flush, that
> > > window is much wider and the real solution should be to try to switch
> > > the
From: Of James Bottomley
> Sent: 22 June 2015 18:36
> To: Alan Stern
...
> > > Obviously, for a disk with a writeback cache that can't do flush, that
> > > window is much wider and the real solution should be to try to switch
> > > the cache to write through.
> >
> > I agree. Doing the switch manu
> Please test it now. I'd like to know if it fixes your problem,
> regardless of how the discussion goes.
Seems to be working, I also attached the kernel log.
The "flush failed" will grow with disc activity (but that was to be expected).
Jun 22 23:24:50 m3800 kernel: usb 1-3: new high-speed USB
On Mon, 2015-06-22 at 13:48 -0400, Alan Stern wrote:
> On Mon, 22 Jun 2015, James Bottomley wrote:
>
> > On Mon, 2015-06-22 at 13:30 -0400, Alan Stern wrote:
> > > On Mon, 22 Jun 2015, James Bottomley wrote:
> > >
> > > > I'm not sure I entirely like this: we are back again treating data
> > > >
On Mon, 22 Jun 2015, Markus Rathgeb wrote:
> >> > Maybe your patch will be acceptable, though. We'll have to hear from
> >> > Markus and Matt.
> >>
> >> We'll probably have to take this to fsdevel as well ... they might have
> >> opinions about whether the FS wants to be informed about flush fail
>> > Maybe your patch will be acceptable, though. We'll have to hear from
>> > Markus and Matt.
>>
>> We'll probably have to take this to fsdevel as well ... they might have
>> opinions about whether the FS wants to be informed about flush failure.
So, it is okay to wait for the end of that discu
On Mon, 22 Jun 2015, James Bottomley wrote:
> On Mon, 2015-06-22 at 13:30 -0400, Alan Stern wrote:
> > On Mon, 22 Jun 2015, James Bottomley wrote:
> >
> > > I'm not sure I entirely like this: we are back again treating data
> > > corruption problems silently.
> > >
> > > However, I also believe
On Mon, 2015-06-22 at 13:30 -0400, Alan Stern wrote:
> On Mon, 22 Jun 2015, James Bottomley wrote:
>
> > I'm not sure I entirely like this: we are back again treating data
> > corruption problems silently.
> >
> > However, I also believe treating a single flush failure as a critical
> > filesyst
On Mon, 22 Jun 2015, James Bottomley wrote:
> I'm not sure I entirely like this: we are back again treating data
> corruption problems silently.
>
> However, I also believe treating a single flush failure as a critical
> filesystem error is also wrong: The data's all there correctly; all it
> d
On Mon, 2015-06-22 at 10:55 -0400, Alan Stern wrote:
> Some USB mass-storage devices claim to have a write-back cache but
> don't support the SYNCHRONIZE CACHE command, which means there is no
> way to tell these devices to flush their caches out to permanent
> storage. Unfortunately, there is not
Some USB mass-storage devices claim to have a write-back cache but
don't support the SYNCHRONIZE CACHE command, which means there is no
way to tell these devices to flush their caches out to permanent
storage. Unfortunately, there is nothing we can do about this.
Until recently this deficiency di
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