[dm-devel] [mdadm PATCH] Create: tell udev md device is not ready when first created.
Jes Sorensen
jes.sorensen at gmail.com
Wed May 3 14:45:33 UTC 2017
On 05/03/2017 10:32 AM, Peter Rajnoha wrote:
> On 05/02/2017 03:42 PM, Jes Sorensen wrote:
>> On 04/28/2017 01:05 AM, NeilBrown wrote:
>>>
>>> When an array is created the content is not initialized,
>>> so it could have remnants of an old filesystem or md array
>>> etc on it.
>>> udev will see this and might try to activate it, which is almost
>>> certainly not what is wanted.
>>>
>>> So create a mechanism for mdadm to communicate with udev to tell
>>> it that the device isn't ready. This mechanism is the existance
>>> of a file /run/mdadm/created-mdXXX where mdXXX is the md device name.
>>>
>>> When creating an array, mdadm will create the file.
>>> A new udev rule file, 01-md-raid-creating.rules, will detect the
>>> precense of thst file and set ENV{SYSTEMD_READY}="0".
>>> This is fairly uniformly used to suppress actions based on the
>>> contents of the device.
>>>
>>> Signed-off-by: NeilBrown <neilb at suse.com>
>>> ---
>>> Assemble.c | 2 +-
>>> Build.c | 2 +-
>>> Create.c | 9 +++++++-
>>> Incremental.c | 4 ++--
>>> Makefile | 4 ++--
>>> lib.c | 29 +++++++++++++++++++++++++
>>> mdadm.h | 4 +++-
>>> mdopen.c | 52
>>> ++++++++++++++++++++++++++++-----------------
>>> udev-md-raid-creating.rules | 7 ++++++
>>> 9 files changed, 86 insertions(+), 27 deletions(-)
>>> create mode 100644 udev-md-raid-creating.rules
>>
>> Applied!
>>
>
> How is this solving the problem then? The patch is flagging a device as
> not ready, then clearing the flag after some time. Where does the wiping
> happen actually?
There is *NO* wiping happening, there is *NO* wiping going to happen.
Can we stop this nonsense now!
Thank you!
Jes
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