[PATCH v8 6/8] writeback, cgroup: split out the functional part of inode_switch_wbs_work_fn()

Roman Gushchin
2021-06-08T01:31:21Z

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-b10kYP2dOMg@public.gmane.org>
Reviewed-by: Jan Kara <jack-AlSwsSmVLrQ@public.gmane.org>
Acked-by: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Acked-by: Dennis Zhou <dennis-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.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 backing_dev_info *bdi)
up_write(&bdi->wb_switch_rwsem);
}

-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 =
- container_of(to_rcu_work(work), struct inode_switch_wbs_context, work);
- struct inode *inode = isw->inode;
struct backing_dev_info *bdi = inode_to_bdi(inode);
struct address_space *mapping = inode->i_mapping;
struct bdi_writeback *old_wb = inode->i_wb;
- struct bdi_writeback *new_wb = isw->new_wb;
XA_STATE(xas, &mapping->i_pages, 0);
struct page *page;
bool switched = false;
@@ -470,11 +467,17 @@ static void inode_switch_wbs_work_fn(struct work_struct *work)
wb_wakeup(new_wb);
wb_put(old_wb);
}
- wb_put(new_wb);
+}

- iput(inode);
- kfree(isw);
+static void inode_switch_wbs_work_fn(struct work_struct *work)
+{
+ struct inode_switch_wbs_context *isw =
+ container_of(to_rcu_work(work), struct inode_switch_wbs_context, work);

+ 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);
}

--
2.31.1