[md PATCH 0/2] Make it possible to disable create_on_open semantics.

[NeilBrown <neilb@suse.com>]

Currently, opening an md /dev node will create the array object.
This makes it hard to destroy the object as udev will typically
re-open the device node when handling REMOVE events.

The "new_array" module parameter was created to work towards avoiding
this problem, and it can be used when
  CREATE names=yes

is given in /etc/mdadm.conf.
How this doesn't currently support names like "md%d", which lots of
people use and expect, so we need more work before we can transition
away from create_on_open.

These patches add support to "new_array" so that md%d devices
can be created.  This will make it, once again, possible to have
md%d devices with numbers > 511. (3.17 make this impossible).

An enhancement to mdadm that uses this will cause new_array to always
be used (where available), and we can then disable create_on_open
completely (after suitable transition periods).

NeilBrown



---

NeilBrown (2):
      md: allow creation of mdNNN arrays via md_mod/parameters/new_array
      md: support disabling of create-on-open semantics.


 drivers/md/md.c |   48 +++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 41 insertions(+), 7 deletions(-)

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