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mm: simplify bdi refcounting

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Move grabbing and releasing the bdi refcount out of the common
wb_init/wb_exit helpers into code that is only used for the non-default
memcg driven bdi_writeback structures.

[hch@lst.de: add comment]
  Link: https://lkml.kernel.org/r/20211027074207.GA12793@lst.de
[akpm@linux-foundation.org: fix typo]

Link: https://lkml.kernel.org/r/20211021124441.668816-6-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Hellwig 2021-11-05 13:37:04 -07:00 • committed by Linus Torvalds
parent 702f2d1e3b
commit efee17134c
2 changed files with 8 additions and 8 deletions
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3
include/linux/backing-dev-defs.h
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@ -103,6 +103,9 @@ struct wb_completion {
* change as blkcg is disabled and enabled higher up in the hierarchy, a wb
* is tested for blkcg after lookup and removed from index on mismatch so
* that a new wb for the combination can be created.
*
* Each bdi_writeback that is not embedded into the backing_dev_info must hold
* a reference to the parent backing_dev_info. See cgwb_create() for details.
*/
struct bdi_writeback {
struct backing_dev_info *bdi; /* our parent bdi */