nvdimm/pmem: stop using q_usage_count as external pgmap refcount

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Originally all DAX access when through block_device operations and thus
needed a queue reference.  But since commit cccbce6715
("filesystem-dax: convert to dax_direct_access()") all this happens at
the DAX device level which uses its own refcounting.  Having the external
refcount thus wasn't needed but has otherwise been harmless for long
time.

But now that "block: drain file system I/O on del_gendisk" waits for
q_usage_count to reach 0 in del_gendisk this whole scheme can't work
anymore (and pmem is the only driver abusing q_usage_count like that).
So switch to the internal reference and remove the unbalanced
blk_freeze_queue_start that is taken care of by del_gendisk.

Fixes: 8e141f9eb8 ("block: drain file system I/O on del_gendisk")
Reported-by: Yi Zhang <yi.zhang@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20211019073641.2323410-2-hch@lst.de
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

...

This commit is contained in:

Christoph Hellwig 2021-10-19 09:36:40 +02:00 • committed by Dan Williams

parent 3906fe9bb7

commit 3dd60fb9d9

1 changed files with 2 additions and 31 deletions

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drivers/nvdimm/pmem.c

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