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writeback: make writeback_in_progress() take bdi_writeback instead of backing_dev_info 

writeback_in_progress() currently takes @bdi and returns whether
writeback is in progress on its root wb (bdi_writeback).  In
preparation for cgroup writeback support, make it take wb instead.
While at it, make it an inline function.

This patch doesn't make any functional difference.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Tejun Heo 2015-05-22 17:13:53 -04:00 committed by Jens Axboe
parent a06fd6b102
commit bc05873dcc
3 changed files with 14 additions and 17 deletions
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15
fs/fs-writeback.c
View File

@ -65,19 +65,6 @@ struct wb_writeback_work {
*/ */
unsigned int dirtytime_expire_interval = 12 * 60 * 60; unsigned int dirtytime_expire_interval = 12 * 60 * 60;
/**
* writeback_in_progress - determine whether there is writeback in progress
* @bdi: the device's backing_dev_info structure.
*
* Determine whether there is writeback waiting to be handled against a
* backing device.
*/
int writeback_in_progress(struct backing_dev_info *bdi)
{
return test_bit(WB_writeback_running, &bdi->wb.state);
}
EXPORT_SYMBOL(writeback_in_progress);
static inline struct inode *wb_inode(struct list_head *head) static inline struct inode *wb_inode(struct list_head *head)
{ {
return list_entry(head, struct inode, i_wb_list); return list_entry(head, struct inode, i_wb_list);
@ -1532,7 +1519,7 @@ int try_to_writeback_inodes_sb_nr(struct super_block *sb,
unsigned long nr, unsigned long nr,
enum wb_reason reason) enum wb_reason reason)
{ {
if (writeback_in_progress(sb->s_bdi)) if (writeback_in_progress(&sb->s_bdi->wb))
return 1; return 1;
if (!down_read_trylock(&sb->s_umount)) if (!down_read_trylock(&sb->s_umount))

12
include/linux/backing-dev.h
View File

@ -156,7 +156,17 @@ int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio);
extern struct backing_dev_info noop_backing_dev_info; extern struct backing_dev_info noop_backing_dev_info;
int writeback_in_progress(struct backing_dev_info *bdi); /**
* writeback_in_progress - determine whether there is writeback in progress
* @wb: bdi_writeback of interest
*
* Determine whether there is writeback waiting to be handled against a
* bdi_writeback.
*/
static inline bool writeback_in_progress(struct bdi_writeback *wb)
{
return test_bit(WB_writeback_running, &wb->state);
}
static inline struct backing_dev_info *inode_to_bdi(struct inode *inode) static inline struct backing_dev_info *inode_to_bdi(struct inode *inode)
{ {

4
mm/page-writeback.c
View File

@ -1455,7 +1455,7 @@ static void balance_dirty_pages(struct address_space *mapping,
break; break;
} }
if (unlikely(!writeback_in_progress(bdi))) if (unlikely(!writeback_in_progress(wb)))
bdi_start_background_writeback(bdi); bdi_start_background_writeback(bdi);
if (!strictlimit) if (!strictlimit)
@ -1573,7 +1573,7 @@ pause:
if (!dirty_exceeded && wb->dirty_exceeded) if (!dirty_exceeded && wb->dirty_exceeded)
wb->dirty_exceeded = 0; wb->dirty_exceeded = 0;
if (writeback_in_progress(bdi)) if (writeback_in_progress(wb))
return; return;
/* /*