Re: 4.11: ida_remove called for id=16 which is not allocated.

On Sun, 4 Jun 2017, Marc MERLIN wrote:

On Sun, Jun 04, 2017 at 06:55:09PM -0700, Marc MERLIN wrote:

quoted

gargamel:/sys/block/bcache1/bcache# echo 1 > stop
returned nothing.
Actually I was kind of expecting a note in my logs that the cache had
been stopped, but eh, at least no errors :)

Right, but now how do I re-enable my cache?
I can't seem to.

gargamel:/sys/block/md8# ls bcache
ls: cannot access 'bcache': No such file or directory

gargamel:/sys/block/bcache1# l
total 0
drwxr-xr-x  8 root root    0 Jun  4 18:53 ./
drwxr-xr-x 15 root root    0 Jun  4 18:53 ../
-r--r--r--  1 root root 4096 Jun  4 18:53 alignment_offset
-rw-r--r--  1 root root 4096 Jun  4 18:53 badblocks
lrwxrwxrwx  1 root root    0 Jun  4 18:53 bcache -> ../md8/bcache
lrwxrwxrwx  1 root root    0 Jun  4 18:53 bdi -> ../../bdi/252:16/

gargamel:/sys/block/bcache1# l ../md8/bcache
ls: cannot access '../md8/bcache': No such file or directory

Don't trust ../ to link correctly with so many symlinks floating around.  
Sometimes ../ will be interpreted correctly via a link path, other times 
it will use the '..' inode's content which may not be the way you came in.  
I'm not saying thats the problem, but perhaps...

 echo /dev/md8 > 4a46e74d-0376-41e7-aff4-0a0497b9e3c5/unregister 

Try echo 1 > uuid/unregister

gargamel:/sys/block/bcache1/bcache# echo /dev/md8 >  /sys/fs/bcache/register 
bcache: register_bcache() error opening /dev/md8: device already registered

Looks like stop doesn't unregister the device, I can't re-register it,
nor restart it.

Or am I missing something?
I'd love not to have to reboot to recover :)

Is /dev/md8 the cache or bdev?

Did you stop the cache, too, in /sys/fs/bcache/uuid/stop? 

Stopping via /sys/block/bcache0/bcache/stop doesn't stop the cache IIRC.


--
Eric Wheeler

Thanks,
Marc
-- 
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
                                      .... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/                         | PGP 1024R/763BE901