Changes in /sys/bcache in kernel 3.13

Changes in /sys/bcache in kernel 3.13

[Rolf Fokkens]

Hi All,

bcache-status stopped working in kernel 3.13, see also: 
https://bugzilla.redhat.com/show_bug.cgi?id=1066555

It's probably related to the change "Fix dirty_data accounting" in 
kernel 3.13-rc4. What specifically has changes is the fact that that 
/sys/fs/bcache/<UUID>/dirty_data has been removed, which breaks 
bcache-status (https://gist.github.com/djwong/6343451). Just removing 
the check / reference to this dirty_data item fixes bcache-status. Or 
has it been replaced by a specific item?

Oh, BTW: bcache.txt still refers to dirty_data in /sys/fs/bcache/<UUID> 
which doesn't seem correct to me.

Cheers,

Rolf

Re: Changes in /sys/bcache in kernel 3.13

[Darrick J. Wong]

On Tue, Feb 18, 2014 at 11:28:24PM +0100, Rolf Fokkens wrote:
> Hi All,
> 
> bcache-status stopped working in kernel 3.13, see also:
> https://bugzilla.redhat.com/show_bug.cgi?id=1066555

Oh, there are RH bugzillas about bcache-status problems?  I guess that makes me
'upstream'.  :D

Well, I guess I'll fix the no-newline-at-end problem too.

> It's probably related to the change "Fix dirty_data accounting" in
> kernel 3.13-rc4. What specifically has changes is the fact that that
> /sys/fs/bcache/<UUID>/dirty_data has been removed, which breaks
> bcache-status (https://gist.github.com/djwong/6343451). Just
> removing the check / reference to this dirty_data item fixes
> bcache-status. Or has it been replaced by a specific item?

<shrug> I simply removed the dirty_data line and prettied up some of the
formatting too.  I don't have a problem with pulling the dirty data stats off
the backing device.

Gist updated.

--D
> 
> Oh, BTW: bcache.txt still refers to dirty_data in
> /sys/fs/bcache/<UUID> which doesn't seem correct to me.
> 
> Cheers,
> 
> Rolf
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Re: Changes in /sys/bcache in kernel 3.13

[Rolf Fokkens]

On 02/19/2014 03:32 AM, Darrick J. Wong wrote:
> Oh, there are RH bugzillas about bcache-status problems? I guess that 
> makes me 'upstream'. :D Well, I guess I'll fix the no-newline-at-end 
> problem too.
Thanks for accepting the upstream responsibility :-)
> <shrug> I simply removed the dirty_data line and prettied up some of 
> the formatting too. I don't have a problem with pulling the dirty data 
> stats off the backing device. Gist updated. --D 
Thanks. I updated the Fedora package.

Rolf