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From:   Roman Gushchin <guro@fb.com>
To:     Jan Kara <jack@suse.cz>, Tejun Heo <tj@kernel.org>
CC:     <linux-fsdevel@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-mm@kvack.org>, Alexander Viro <viro@zeniv.linux.org.uk>,
        Dennis Zhou <dennis@kernel.org>,
        Dave Chinner <dchinner@redhat.com>, <cgroups@vger.kernel.org>,
        Roman Gushchin <guro@fb.com>
Subject: [PATCH v8 6/8] writeback, cgroup: split out the functional part of inode_switch_wbs_work_fn()
Date:   Mon, 7 Jun 2021 18:31:21 -0700
Message-ID: <20210608013123.1088882-7-guro@fb.com>
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Split out the functional part of the inode_switch_wbs_work_fn()
function as inode_do switch_wbs() to reuse it later for switching
inodes attached to dying cgwbs.

This commit doesn't bring any functional changes.

Signed-off-by: Roman Gushchin <guro@fb.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: Dennis Zhou <dennis@kernel.org>
---
 fs/fs-writeback.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 87b305ee5348..5520a6b5cc4d 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -351,15 +351,12 @@ static void bdi_up_write_wb_switch_rwsem(struct bac=
king_dev_info *bdi)
 	up_write(&bdi->wb_switch_rwsem);
 }
=20
-static void inode_switch_wbs_work_fn(struct work_struct *work)
+static void inode_do_switch_wbs(struct inode *inode,
+				struct bdi_writeback *new_wb)
 {
-	struct inode_switch_wbs_context *isw =3D
-		container_of(to_rcu_work(work), struct inode_switch_wbs_context, work)=
;
-	struct inode *inode =3D isw->inode;
 	struct backing_dev_info *bdi =3D inode_to_bdi(inode);
 	struct address_space *mapping =3D inode->i_mapping;
 	struct bdi_writeback *old_wb =3D inode->i_wb;
-	struct bdi_writeback *new_wb =3D isw->new_wb;
 	XA_STATE(xas, &mapping->i_pages, 0);
 	struct page *page;
 	bool switched =3D false;
@@ -470,11 +467,17 @@ static void inode_switch_wbs_work_fn(struct work_st=
ruct *work)
 		wb_wakeup(new_wb);
 		wb_put(old_wb);
 	}
-	wb_put(new_wb);
+}
=20
-	iput(inode);
-	kfree(isw);
+static void inode_switch_wbs_work_fn(struct work_struct *work)
+{
+	struct inode_switch_wbs_context *isw =3D
+		container_of(to_rcu_work(work), struct inode_switch_wbs_context, work)=
;
=20
+	inode_do_switch_wbs(isw->inode, isw->new_wb);
+	wb_put(isw->new_wb);
+	iput(isw->inode);
+	kfree(isw);
 	atomic_dec(&isw_nr_in_flight);
 }
=20
--=20
2.31.1