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writeback: merge bdi_writeback_task and bdi_start_fn 

Move all code for the writeback thread into fs/fs-writeback.c instead of
splitting it over two functions in two files.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Christoph Hellwig 2010-06-19 23:08:22 +02:00 committed by Jens Axboe
parent c1955ce32f
commit 082439004b
3 changed files with 36 additions and 45 deletions
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35
fs/fs-writeback.c
View File

@ -775,12 +775,36 @@ long wb_do_writeback(struct bdi_writeback *wb, int force_wait)
* Handle writeback of dirty data for the device backed by this bdi. Also
* wakes up periodically and does kupdated style flushing.
*/
int bdi_writeback_task(struct bdi_writeback *wb)
int bdi_writeback_thread(void *data)
{
struct bdi_writeback *wb = data;
struct backing_dev_info *bdi = wb->bdi;
unsigned long last_active = jiffies;
unsigned long wait_jiffies = -1UL;
long pages_written;
/*
* Add us to the active bdi_list
*/
spin_lock_bh(&bdi_lock);
list_add_rcu(&bdi->bdi_list, &bdi_list);
spin_unlock_bh(&bdi_lock);
current->flags |= PF_FLUSHER | PF_SWAPWRITE;
set_freezable();
/*
* Our parent may run at a different priority, just set us to normal
*/
set_user_nice(current, 0);
/*
* Clear pending bit and wakeup anybody waiting to tear us down
*/
clear_bit(BDI_pending, &bdi->state);
smp_mb__after_clear_bit();
wake_up_bit(&bdi->state, BDI_pending);
while (!kthread_should_stop()) {
pages_written = wb_do_writeback(wb, 0);
@ -813,9 +837,18 @@ int bdi_writeback_task(struct bdi_writeback *wb)
try_to_freeze();
}
wb->task = NULL;
/*
* Flush any work that raced with us exiting. No new work
* will be added, since this bdi isn't discoverable anymore.
*/
if (!list_empty(&bdi->work_list))
wb_do_writeback(wb, 1);
return 0;
}
/*
* Start writeback of `nr_pages' pages. If `nr_pages' is zero, write back
* the whole world.

2
include/linux/backing-dev.h
View File

@ -102,7 +102,7 @@ void bdi_unregister(struct backing_dev_info *bdi);
int bdi_setup_and_register(struct backing_dev_info *, char *, unsigned int);
void bdi_start_writeback(struct backing_dev_info *bdi, long nr_pages);
void bdi_start_background_writeback(struct backing_dev_info *bdi);
int bdi_writeback_task(struct bdi_writeback *wb);
int bdi_writeback_thread(void *data);
int bdi_has_dirty_io(struct backing_dev_info *bdi);
void bdi_arm_supers_timer(void);

44
mm/backing-dev.c
View File

@ -260,48 +260,6 @@ static void bdi_wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi)
INIT_LIST_HEAD(&wb->b_more_io);
}
static int bdi_start_fn(void *ptr)
{
struct bdi_writeback *wb = ptr;
struct backing_dev_info *bdi = wb->bdi;
int ret;
/*
* Add us to the active bdi_list
*/
spin_lock_bh(&bdi_lock);
list_add_rcu(&bdi->bdi_list, &bdi_list);
spin_unlock_bh(&bdi_lock);
current->flags |= PF_FLUSHER | PF_SWAPWRITE;
set_freezable();
/*
* Our parent may run at a different priority, just set us to normal
*/
set_user_nice(current, 0);
/*
* Clear pending bit and wakeup anybody waiting to tear us down
*/
clear_bit(BDI_pending, &bdi->state);
smp_mb__after_clear_bit();
wake_up_bit(&bdi->state, BDI_pending);
ret = bdi_writeback_task(wb);
wb->task = NULL;
/*
* Flush any work that raced with us exiting. No new work
* will be added, since this bdi isn't discoverable anymore.
*/
if (!list_empty(&bdi->work_list))
wb_do_writeback(wb, 1);
return ret;
}
int bdi_has_dirty_io(struct backing_dev_info *bdi)
{
return wb_has_dirty_io(&bdi->wb);
@ -425,7 +383,7 @@ static int bdi_forker_task(void *ptr)
spin_unlock_bh(&bdi_lock);
wb = &bdi->wb;
wb->task = kthread_run(bdi_start_fn, wb, "flush-%s",
wb->task = kthread_run(bdi_writeback_thread, wb, "flush-%s",
dev_name(bdi->dev));
/*
* If task creation fails, then readd the bdi to