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| author |   Dennis Zhou (Facebook) <dennisszhou@gmail.com> | 2018-09-11 14:41:35 -0400 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2018-09-21 20:29:16 -0600 |
| commit | e2b0989954ae7c80609f77e7ce203bea6d2c54e1 (patch) | |
| tree | 7535c7f39e57d02ae1ff497ca28c339c4be80e65 /block | |
| parent | blkcg: remove additional reference to the css (diff) | |
| download | linux-dev-e2b0989954ae7c80609f77e7ce203bea6d2c54e1.tar.xz linux-dev-e2b0989954ae7c80609f77e7ce203bea6d2c54e1.zip | |
blkcg: cleanup and make blk_get_rl use blkg_lookup_create
blk_get_rl is responsible for identifying which request_list a request
should be allocated to. Try get logic was added earlier, but
semantically the logic was not changed.
This patch makes better use of the bio already having a reference to the
blkg in the hot path. The cold path uses a better fallback of
blkg_lookup_create rather than just blkg_lookup and then falling back to
the q->root_rl. If lookup_create fails with anything but -ENODEV, it
falls back to q->root_rl.
A clarifying comment is added to explain why q->root_rl is used rather
than the root blkg's rl.
Signed-off-by: Dennis Zhou <dennisszhou@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
0 files changed, 0 insertions, 0 deletions