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writeback: relocate wb[_try]_get(), wb_put(), inode_{attach|detach}_wb()

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Currently, majority of cgroup writeback support including all the
above functions are implemented in include/linux/backing-dev.h and
mm/backing-dev.c; however, the portion closely related to writeback
logic implemented in include/linux/writeback.h and mm/page-writeback.c
will expand to support foreign writeback detection and correction.

This patch moves wb[_try]_get() and wb_put() to
include/linux/backing-dev-defs.h so that they can be used from
writeback.h and inode_{attach|detach}_wb() to writeback.h and
page-writeback.c.

This is pure reorganization and doesn't introduce any functional
changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jan Kara <jack@suse.cz>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Greg Thelen <gthelen@google.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Tejun Heo 2015-05-28 14:50:49 -04:00 • committed by Jens Axboe
parent 97c9341f72
commit 21c6321fbb
5 changed files with 127 additions and 112 deletions
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46
include/linux/writeback.h
View file

@ -8,6 +8,7 @@
#include <linux/workqueue.h>
#include <linux/fs.h>
#include <linux/flex_proportions.h>
#include <linux/backing-dev-defs.h>
DECLARE_PER_CPU(int, dirty_throttle_leaks);
@ -173,6 +174,51 @@ static inline void wait_on_inode(struct inode *inode)
wait_on_bit(&inode->i_state, __I_NEW, TASK_UNINTERRUPTIBLE);
}
#ifdef CONFIG_CGROUP_WRITEBACK
void __inode_attach_wb(struct inode *inode, struct page *page);
/**
* inode_attach_wb - associate an inode with its wb
* @inode: inode of interest
* @page: page being dirtied (may be NULL)
*
* If @inode doesn't have its wb, associate it with the wb matching the
* memcg of @page or, if @page is NULL, %current. May be called w/ or w/o
* @inode->i_lock.
*/
static inline void inode_attach_wb(struct inode *inode, struct page *page)
{
if (!inode->i_wb)
__inode_attach_wb(inode, page);
}
/**
* inode_detach_wb - disassociate an inode from its wb
* @inode: inode of interest
*
* @inode is being freed. Detach from its wb.
*/
static inline void inode_detach_wb(struct inode *inode)
{
if (inode->i_wb) {
wb_put(inode->i_wb);
inode->i_wb = NULL;
}
}
#else /* CONFIG_CGROUP_WRITEBACK */
static inline void inode_attach_wb(struct inode *inode, struct page *page)
{
}
static inline void inode_detach_wb(struct inode *inode)
{
}
#endif /* CONFIG_CGROUP_WRITEBACK */
/*
* mm/page-writeback.c
*/