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| author | Christoph Hellwig <hch@lst.de> | 2021-11-05 13:37:04 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-11-06 13:30:34 -0700 |
| commit | efee17134ca464639a2f5b4d036ce40caf1b247a (patch) | |
| tree | ab0db78acebfe2bdbeb0cd3109523d10388f6e8e /include/linux/backing-dev-defs.h | |
| parent | 702f2d1e3b33617a8d9a9424f08a69b7c51642a7 (diff) | |
| download | lwn-efee17134ca464639a2f5b4d036ce40caf1b247a.tar.gz lwn-efee17134ca464639a2f5b4d036ce40caf1b247a.zip | |
mm: simplify bdi refcounting
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>
Diffstat (limited to 'include/linux/backing-dev-defs.h')
| -rw-r--r-- | include/linux/backing-dev-defs.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/backing-dev-defs.h b/include/linux/backing-dev-defs.h index 33207004cfde..993c5628a726 100644 --- a/include/linux/backing-dev-defs.h +++ b/include/linux/backing-dev-defs.h @@ -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 */ |