summaryrefslogtreecommitdiff
path: root/include/linux/backing-dev.h
diff options
context:
space:
mode:
authorTejun Heo <tj@kernel.org>2019-08-26 19:06:53 +0300
committerJens Axboe <axboe@kernel.dk>2019-08-27 18:22:38 +0300
commit34f8fe501f0624de115d087680c84000b5d9abc9 (patch)
tree7c21102bb603a5ac0519fcfded63f9df89c25736 /include/linux/backing-dev.h
parent5b9cce4c7eb0696558dfd4946074ae1fb9d8f05d (diff)
downloadlinux-34f8fe501f0624de115d087680c84000b5d9abc9.tar.xz
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.h1
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)