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@xxxxxxxx>
---
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!
I like this solution much better, even though I am not in love with the
giant usleep() call. Would be nice to find a better way around that.
Sorry it took so long to get back to you on this, last week was a mess.
Thanks,
Jes
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