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authorDennis Zhou <dennis@kernel.org>2018-12-05 20:10:34 +0300
committerJens Axboe <axboe@kernel.dk>2018-12-08 08:26:37 +0300
commitfd42df305f804ddc0d5ac028e944784283b2f92d (patch)
treef10e4821b3dca25647f1eaf401b8f4529d0d2ade /include/linux/writeback.h
parent6a7f6d86a561473032287c8e4583eac5853c6efa (diff)
downloadlinux-fd42df305f804ddc0d5ac028e944784283b2f92d.tar.xz
blkcg: associate writeback bios with a blkg
One of the goals of this series is to remove a separate reference to the css of the bio. This can and should be accessed via bio_blkcg(). In this patch, wbc_init_bio() now requires a bio to have a device associated with it. Signed-off-by: Dennis Zhou <dennis@kernel.org> Reviewed-by: Josef Bacik <josef@toxicpanda.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/writeback.h')
-rw-r--r--include/linux/writeback.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index fdfd04e348f6..738a0c24874f 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -246,7 +246,8 @@ static inline void wbc_attach_fdatawrite_inode(struct writeback_control *wbc,
*
* @bio is a part of the writeback in progress controlled by @wbc. Perform
* writeback specific initialization. This is used to apply the cgroup
- * writeback context.
+ * writeback context. Must be called after the bio has been associated with
+ * a device.
*/
static inline void wbc_init_bio(struct writeback_control *wbc, struct bio *bio)
{
@@ -257,7 +258,7 @@ static inline void wbc_init_bio(struct writeback_control *wbc, struct bio *bio)
* regular writeback instead of writing things out itself.
*/
if (wbc->wb)
- bio_associate_blkcg(bio, wbc->wb->blkcg_css);
+ bio_associate_blkg_from_css(bio, wbc->wb->blkcg_css);
}
#else /* CONFIG_CGROUP_WRITEBACK */