[PATCH 01/31] block: also call ->open for incremental partition opens

[Christoph Hellwig]

On Wed, Jun 07, 2023 at 10:14:22AM +0200, Christian Brauner wrote:
> This assumes that all drivers deal with additional ->open() calls for
> each partition correctly which I assumed you checked so,

They have to, because they already get the additional open for
extra opens of the whole device.  The current behavior is:

open("/dev/vdb", ...)
  ->open called

open("/dev/vdb", ...)
  ->open called

----

open("/dev/vdb", ...)
  ->open called

open("/dev/vdb1", ...)
  ->open called

----

open("/dev/vdb1", ...)
  ->open called

open("/dev/vdb1", ...)
  ->open NOT called

which is very inconsistent.