NACK: [SRU][Zesty][v2][PATCH 0/2] UBUNTU: SAUCE: (no-up) Fixes for LP:1729145

[Stefan Bader]

On 11.12.2017 15:20, Joseph Salisbury wrote:
> BugLink: http://bugs.launchpad.net/bugs/1729145
> 
> == SRU Justification ==
> This bug is preventing /dev/bcache/by-uuid links from beingcreated after reboot.
> It appears that since the initramfs loads the bcache module which probes and 
> finds all of the cache devices and backing devices then once the rootfs is
> mounted and udev gets to run, the bcache kernel module does not emit the
> CACHED_UUID value into the environment if the underlying devices are already registered.     
> 
> With this patch, instead of just failing with "device already registered"
> the kernel emits another uevent with CACHED_UUID which would be processed
> another time to set up a symlink.
> 
> This patch is not yet upstream, but we will submit it there as well.  However,
> requesting this a SAUCE patch until it lands upstream.
> 
> This patch has also been submitted for X, A and B.  However, Zesty also
> needs mainlin commit 4b758df21e as a prereq.  Commit 4b758df21e was cc'd to 
> upstream stable.  However, 4.10 is EOL upstream, so Zesty never got it.
> 
> == Fix ==
> Patch from Ryan Harper <ryan.harper at canonical.com>:
> bcache: decouple emitting a cached_dev CHANGE uevent
> 
> Also the following commit as a prereq:
> 4b758df21ee7 ("bcache: Fix leak of bdev reference")
> 
> == Regression Potential ==
> There is some risk of regression, since this is new code.   However, it is
> limited to the bcache.
> 
> == Test Case ==
> A test kernel was built with these patches and tested by the original bug reporter.
> The bug reporter states the test kernel resolved the bug.
> 
> Jan Kara (1):
>   bcache: Fix leak of bdev reference
> 
> Ryan Harper (1):
>   bcache: decouple emitting a cached_dev CHANGE uevent
> 
>  drivers/md/bcache/bcache.h |  1 +
>  drivers/md/bcache/super.c  | 55 +++++++++++++++++++++++++++++++++++++---------
>  2 files changed, 46 insertions(+), 10 deletions(-)
> 
Zesty is EOL

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