diff options
| author |   Tejun Heo <tj@kernel.org> | 2019-08-26 09:06:53 -0700 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2019-08-27 09:22:38 -0600 |
| commit | 34f8fe501f0624de115d087680c84000b5d9abc9 (patch) | |
| tree | 7c21102bb603a5ac0519fcfded63f9df89c25736 /include/linux/backing-dev.h | |
| parent | writeback: Generalize and expose wb_completion (diff) | |
| download | wireguard-linux-34f8fe501f0624de115d087680c84000b5d9abc9.tar.xz wireguard-linux-34f8fe501f0624de115d087680c84000b5d9abc9.zip | |
bdi: Add bdi->id
There currently is no way to universally identify and lookup a bdi
without holding a reference and pointer to it. This patch adds an
non-recycling bdi->id and implements bdi_get_by_id() which looks up
bdis by their ids. This will be used by memcg foreign inode flushing.
I left bdi_list alone for simplicity and because while rb_tree does
support rcu assignment it doesn't seem to guarantee lossless walk when
walk is racing aginst tree rebalance operations.
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/backing-dev.h')
| -rw-r--r-- | include/linux/backing-dev.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h index 02650b1253a2..84cdcfbc763f 100644 --- a/include/linux/backing-dev.h +++ b/include/linux/backing-dev.h @@ -24,6 +24,7 @@ static inline struct backing_dev_info *bdi_get(struct backing_dev_info *bdi) return bdi; } +struct backing_dev_info *bdi_get_by_id(u64 id); void bdi_put(struct backing_dev_info *bdi); __printf(2, 3) |