[PATCH 46/49] writeback: dirty inodes against their matching cgroup bdi_writeback's

Tejun Heo
2015-04-06T20:02:02Z

__mark_inode_dirty() always dirtied the inode against the root wb
(bdi_writeback). The previous patches added all the infrastructure
necessary to attribute an inode against the wb of the dirtying cgroup.

This patch updates __mark_inode_dirty() so that it uses the wb
associated with the inode instead of unconditionally using the root
one.

Currently, none of the filesystems has FS_CGROUP_WRITEBACK and all
pages will keep being dirtied against the root wb.

v2: Updated for per-inode wb association.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jan Kara <jack@suse.cz>
---
fs/fs-writeback.c | 23 +++++++++++------------
1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 9f42c14..2b9c82b 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -1432,7 +1432,6 @@ static noinline void block_dump___mark_inode_dirty(struct inode *inode)
void __mark_inode_dirty(struct inode *inode, int flags)
{
struct super_block *sb = inode->i_sb;
- struct backing_dev_info *bdi = NULL;
int dirtytime;

trace_writeback_mark_inode_dirty(inode, flags);
@@ -1502,21 +1501,21 @@ void __mark_inode_dirty(struct inode *inode, int flags)
* reposition it (that would break b_dirty time-ordering).
*/
if (!was_dirty) {
+ struct bdi_writeback *wb = inode_to_wb(inode);
bool wakeup_bdi = false;
- bdi = inode_to_bdi(inode);

spin_unlock(&inode->i_lock);
- spin_lock(&bdi->wb.list_lock);
+ spin_lock(&wb->list_lock);

- WARN(bdi_cap_writeback_dirty(bdi) &&
- !test_bit(WB_registered, &bdi->wb.state),
- "bdi-%s not registered\n", bdi->name);
+ WARN(bdi_cap_writeback_dirty(wb->bdi) &&
+ !test_bit(WB_registered, &wb->state),
+ "bdi-%s not registered\n", wb->bdi->name);

inode->dirtied_when = jiffies;
- wakeup_bdi = inode_wb_list_move_locked(inode, &bdi->wb,
- dirtytime ? &bdi->wb.b_dirty_time :
- &bdi->wb.b_dirty);
- spin_unlock(&bdi->wb.list_lock);
+ wakeup_bdi = inode_wb_list_move_locked(inode, wb,
+ dirtytime ? &wb->b_dirty_time :
+ &wb->b_dirty);
+ spin_unlock(&wb->list_lock);
trace_writeback_dirty_inode_enqueue(inode);

/*
@@ -1525,8 +1524,8 @@ void __mark_inode_dirty(struct inode *inode, int flags)
* to make sure background write-back happens
* later.
*/
- if (bdi_cap_writeback_dirty(bdi) && wakeup_bdi)
- wb_wakeup_delayed(&bdi->wb);
+ if (bdi_cap_writeback_dirty(wb->bdi) && wakeup_bdi)
+ wb_wakeup_delayed(wb);
return;
}
}
--
2.1.0