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writeback: move nr_pages == 0 logic to one location 

Now that we have no external callers of wb_start_writeback(), we
can shuffle the passing in of 'nr_pages'. Everybody passes in 0
at this point, so just kill the argument and move the dirty
count retrieval to that function.

Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Tested-by: Chris Mason <clm@fb.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2017-09-28 11:31:22 -06:00
parent 9dfb176fae
commit e8e8a0c6c9
1 changed files with 17 additions and 24 deletions
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41
fs/fs-writeback.c
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@ -933,8 +933,18 @@ static void bdi_split_work_to_wbs(struct backing_dev_info *bdi,
#endif /* CONFIG_CGROUP_WRITEBACK */
static void wb_start_writeback(struct bdi_writeback *wb, long nr_pages,
enum wb_reason reason)
/*
* Add in the number of potentially dirty inodes, because each inode
* write can dirty pagecache in the underlying blockdev.
*/
static unsigned long get_nr_dirty_pages(void)
{
return global_node_page_state(NR_FILE_DIRTY) +
global_node_page_state(NR_UNSTABLE_NFS) +
get_nr_dirty_inodes();
}
static void wb_start_writeback(struct bdi_writeback *wb, enum wb_reason reason)
{
struct wb_writeback_work *work;
@ -954,7 +964,7 @@ static void wb_start_writeback(struct bdi_writeback *wb, long nr_pages,
}
work->sync_mode = WB_SYNC_NONE;
work->nr_pages = nr_pages;
work->nr_pages = wb_split_bdi_pages(wb, get_nr_dirty_pages());
work->range_cyclic = 1;
work->reason = reason;
work->auto_free = 1;
@ -1814,17 +1824,6 @@ static struct wb_writeback_work *get_next_work_item(struct bdi_writeback *wb)
return work;
}
/*
* Add in the number of potentially dirty inodes, because each inode
* write can dirty pagecache in the underlying blockdev.
*/
static unsigned long get_nr_dirty_pages(void)
{
return global_node_page_state(NR_FILE_DIRTY) +
global_node_page_state(NR_UNSTABLE_NFS) +
get_nr_dirty_inodes();
}
static long wb_check_background_flush(struct bdi_writeback *wb)
{
if (wb_over_bg_thresh(wb)) {
@ -1951,7 +1950,7 @@ void wb_workfn(struct work_struct *work)
* write back the whole world.
*/
static void __wakeup_flusher_threads_bdi(struct backing_dev_info *bdi,
long nr_pages, enum wb_reason reason)
enum wb_reason reason)
{
struct bdi_writeback *wb;
@ -1959,17 +1958,14 @@ static void __wakeup_flusher_threads_bdi(struct backing_dev_info *bdi,
return;
list_for_each_entry_rcu(wb, &bdi->wb_list, bdi_node)
wb_start_writeback(wb, wb_split_bdi_pages(wb, nr_pages),
reason);
wb_start_writeback(wb, reason);
}
void wakeup_flusher_threads_bdi(struct backing_dev_info *bdi,
enum wb_reason reason)
{
long nr_pages = get_nr_dirty_pages();
rcu_read_lock();
__wakeup_flusher_threads_bdi(bdi, nr_pages, reason);
__wakeup_flusher_threads_bdi(bdi, reason);
rcu_read_unlock();
}
@ -1979,7 +1975,6 @@ void wakeup_flusher_threads_bdi(struct backing_dev_info *bdi,
void wakeup_flusher_threads(enum wb_reason reason)
{
struct backing_dev_info *bdi;
long nr_pages;
/*
* If we are expecting writeback progress we must submit plugged IO.
@ -1987,11 +1982,9 @@ void wakeup_flusher_threads(enum wb_reason reason)
if (blk_needs_flush_plug(current))
blk_schedule_flush_plug(current);
nr_pages = get_nr_dirty_pages();
rcu_read_lock();
list_for_each_entry_rcu(bdi, &bdi_list, bdi_list)
__wakeup_flusher_threads_bdi(bdi, nr_pages, reason);
__wakeup_flusher_threads_bdi(bdi, reason);
rcu_read_unlock();
}