Linux-Block Archive on lore.kernel.org
 help / color / Atom feed
From: Tejun Heo <tj@kernel.org>
To: dsterba@suse.com, clm@fb.com, josef@toxicpanda.com,
	axboe@kernel.dk, jack@suse.cz
Cc: linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-block@vger.kernel.org, kernel-team@fb.com,
	Tejun Heo <tj@kernel.org>
Subject: [PATCH 2/8] blkcg, writeback: Implement wbc_blkcg_css()
Date: Thu, 13 Jun 2019 17:33:44 -0700
Message-ID: <20190614003350.1178444-3-tj@kernel.org> (raw)
In-Reply-To: <20190614003350.1178444-1-tj@kernel.org>

Add a helper to determine the target blkcg from wbc.

Signed-off-by: Tejun Heo <tj@kernel.org>
---
 include/linux/writeback.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index b8f5f000cde4..1c85563f035d 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -93,6 +93,16 @@ static inline int wbc_to_write_flags(struct writeback_control *wbc)
 	return 0;
 }
 
+static inline struct cgroup_subsys_state *
+wbc_blkcg_css(struct writeback_control *wbc)
+{
+#ifdef CONFIG_CGROUP_WRITEBACK
+	if (wbc->wb)
+		return wbc->wb->blkcg_css;
+#endif
+	return blkcg_root_css;
+}
+
 /*
  * A wb_domain represents a domain that wb's (bdi_writeback's) belong to
  * and are measured against each other in.  There always is one global
-- 
2.17.1


  parent reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-14  0:33 [PATCHSET btrfs/for-next] btrfs: fix cgroup writeback support Tejun Heo
2019-06-14  0:33 ` [PATCH 1/8] blkcg, writeback: Add wbc->no_wbc_acct Tejun Heo
2019-06-14 13:41   ` Josef Bacik
2019-06-14  0:33 ` Tejun Heo [this message]
2019-06-14 13:41   ` [PATCH 2/8] blkcg, writeback: Implement wbc_blkcg_css() Josef Bacik
2019-06-14  0:33 ` [PATCH 3/8] blkcg: implement REQ_CGROUP_PUNT Tejun Heo
2019-06-14 13:43   ` Josef Bacik
2019-06-14  0:33 ` [PATCH 4/8] Btrfs: stop using btrfs_schedule_bio() Tejun Heo
2019-06-14 13:45   ` Josef Bacik
2019-06-14  0:33 ` [PATCH 5/8] Btrfs: delete the entire async bio submission framework Tejun Heo
2019-06-14 13:48   ` Josef Bacik
2019-06-14  0:33 ` [PATCH 6/8] Btrfs: only associate the locked page with one async_cow struct Tejun Heo
2019-06-14 13:48   ` Josef Bacik
2019-06-14  0:33 ` [PATCH 7/8] Btrfs: use REQ_CGROUP_PUNT for worker thread submitted bios Tejun Heo
2019-06-14 13:50   ` Josef Bacik
2019-06-14 15:15   ` David Sterba
2019-06-14 15:34     ` Tejun Heo
2019-06-14  0:33 ` [PATCH 8/8] Btrfs: extent_write_locked_range() should attach inode->i_wb Tejun Heo
2019-06-14 14:12   ` Josef Bacik
2019-06-14 15:32   ` [PATCH v2 " Tejun Heo
2019-06-14 17:46 ` [PATCHSET btrfs/for-next] btrfs: fix cgroup writeback support Tejun Heo

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190614003350.1178444-3-tj@kernel.org \
    --to=tj@kernel.org \
    --cc=axboe@kernel.dk \
    --cc=clm@fb.com \
    --cc=dsterba@suse.com \
    --cc=jack@suse.cz \
    --cc=josef@toxicpanda.com \
    --cc=kernel-team@fb.com \
    --cc=linux-block@vger.kernel.org \
    --cc=linux-btrfs@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-Block Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-block/0 linux-block/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-block linux-block/ https://lore.kernel.org/linux-block \
		linux-block@vger.kernel.org linux-block@archiver.kernel.org
	public-inbox-index linux-block


Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-block


AGPL code for this site: git clone https://public-inbox.org/ public-inbox