#include <linux/wait.h>
#include <linux/backing-dev.h>
#include <linux/kthread.h>
#include <linux/freezer.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/writeback.h>
#include <linux/device.h>
#include <trace/events/writeback.h>

Macros
#define	K(pages) ((pages) << (PAGE_SHIFT - 10))

#define	BDI_SHOW(name, expr)

#define	__ATTR_RW(attr) __ATTR(attr, 0644, attr##_show, attr##_store)

#define	INIT_BW (100 << (20 - PAGE_SHIFT))

Functions
	EXPORT_SYMBOL_GPL (default_backing_dev_info)

	EXPORT_SYMBOL_GPL (noop_backing_dev_info)

	DEFINE_SPINLOCK (bdi_lock)

	LIST_HEAD (bdi_list)

	LIST_HEAD (bdi_pending_list)

void	bdi_lock_two (struct bdi_writeback wb1, struct bdi_writeback wb2)

	postcore_initcall (bdi_class_init)

	subsys_initcall (default_bdi_init)

int	bdi_has_dirty_io (struct backing_dev_info *bdi)

void	bdi_wakeup_thread_delayed (struct backing_dev_info *bdi)

int	bdi_register (struct backing_dev_info bdi, struct device parent, const char *fmt,...)

	EXPORT_SYMBOL (bdi_register)

int	bdi_register_dev (struct backing_dev_info *bdi, dev_t dev)

	EXPORT_SYMBOL (bdi_register_dev)

void	bdi_unregister (struct backing_dev_info *bdi)

	EXPORT_SYMBOL (bdi_unregister)

int	bdi_init (struct backing_dev_info *bdi)

	EXPORT_SYMBOL (bdi_init)

void	bdi_destroy (struct backing_dev_info *bdi)

	EXPORT_SYMBOL (bdi_destroy)

int	bdi_setup_and_register (struct backing_dev_info bdi, char name, unsigned int cap)

	EXPORT_SYMBOL (bdi_setup_and_register)

void	clear_bdi_congested (struct backing_dev_info *bdi, int sync)

	EXPORT_SYMBOL (clear_bdi_congested)

void	set_bdi_congested (struct backing_dev_info *bdi, int sync)

	EXPORT_SYMBOL (set_bdi_congested)

long	congestion_wait (int sync, long timeout)

	EXPORT_SYMBOL (congestion_wait)

long	wait_iff_congested (struct zone *zone, int sync, long timeout)

	EXPORT_SYMBOL (wait_iff_congested)

int	pdflush_proc_obsolete (struct ctl_table table, int write, void __user buffer, size_t lenp, loff_t ppos)

Variables
struct backing_dev_info	default_backing_dev_info

struct backing_dev_info	noop_backing_dev_info

Macro Definition Documentation

#define __ATTR_RW ( attr ) __ATTR(attr, 0644, attr##_show, attr##_store)

Definition at line 224 of file backing-dev.c.

#define BDI_SHOW	(	name,
		expr
	)

Value:

static ssize_t name##_show(struct device *dev,              \
               struct device_attribute *attr, char *page)   \
{                                   \
	struct backing_dev_info *bdi = dev_get_drvdata(dev);       \
                                    \
    return snprintf(page, PAGE_SIZE-1, "%lld\n", (long long)expr);  \
}

Definition at line 175 of file backing-dev.c.

#define INIT_BW (100 << (20 - PAGE_SHIFT))

Definition at line 620 of file backing-dev.c.

#define K ( pages ) ((pages) << (PAGE_SHIFT - 10))

Definition at line 173 of file backing-dev.c.

Function Documentation

void bdi_destroy ( struct backing_dev_info * bdi )

Definition at line 665 of file backing-dev.c.

int bdi_has_dirty_io ( struct backing_dev_info * bdi )

Definition at line 258 of file backing-dev.c.

int bdi_init ( struct backing_dev_info * bdi )

Definition at line 622 of file backing-dev.c.

void bdi_lock_two	(	struct bdi_writeback *	wb1,
		struct bdi_writeback *	wb2
	)

Definition at line 42 of file backing-dev.c.

int bdi_register	(	struct backing_dev_info *	bdi,
		struct device *	parent,
		const char *	fmt,
			...
	)

Definition at line 483 of file backing-dev.c.

int bdi_register_dev	(	struct backing_dev_info *	bdi,
		dev_t	dev
	)

Definition at line 526 of file backing-dev.c.

int bdi_setup_and_register	(	struct backing_dev_info *	bdi,
		char *	name,
		unsigned int	cap
	)

Definition at line 705 of file backing-dev.c.

void bdi_unregister ( struct backing_dev_info * bdi )

Definition at line 581 of file backing-dev.c.

void bdi_wakeup_thread_delayed ( struct backing_dev_info * bdi )

Definition at line 294 of file backing-dev.c.

void clear_bdi_congested	(	struct backing_dev_info *	bdi,
		int	sync
	)

Definition at line 734 of file backing-dev.c.

long congestion_wait	(	int	sync,
		long	timeout
	)

congestion_wait - wait for a backing_dev to become uncongested : SYNC or ASYNC IO : timeout in jiffies

Waits for up to jiffies for a backing_dev (any backing_dev) to exit write congestion. If no backing_devs are congested then just wait for the next write to be completed.

Definition at line 767 of file backing-dev.c.

DEFINE_SPINLOCK ( bdi_lock )

EXPORT_SYMBOL ( bdi_register )

EXPORT_SYMBOL ( bdi_register_dev )

EXPORT_SYMBOL ( bdi_unregister )

EXPORT_SYMBOL ( bdi_init )

EXPORT_SYMBOL ( bdi_destroy )

EXPORT_SYMBOL ( bdi_setup_and_register )

EXPORT_SYMBOL ( clear_bdi_congested )

EXPORT_SYMBOL ( set_bdi_congested )

EXPORT_SYMBOL ( congestion_wait )

EXPORT_SYMBOL ( wait_iff_congested )

EXPORT_SYMBOL_GPL ( default_backing_dev_info )

EXPORT_SYMBOL_GPL ( noop_backing_dev_info )

LIST_HEAD ( bdi_list )

LIST_HEAD ( bdi_pending_list )

int pdflush_proc_obsolete	(	struct ctl_table *	table,
		int	write,
		void __user *	buffer,
		size_t *	lenp,
		loff_t *	ppos
	)

Definition at line 840 of file backing-dev.c.

postcore_initcall ( bdi_class_init )

void set_bdi_congested	(	struct backing_dev_info *	bdi,
		int	sync
	)

Definition at line 748 of file backing-dev.c.

subsys_initcall ( default_bdi_init )

long wait_iff_congested	(	struct zone *	zone,
		int	sync,
		long	timeout
	)

wait_iff_congested - Conditionally wait for a backing_dev to become uncongested or a zone to complete writes : A zone to check if it is heavily congested : SYNC or ASYNC IO : timeout in jiffies

In the event of a congested backing_dev (any backing_dev) and the given has experienced recent congestion, this waits for up to jiffies for either a BDI to exit congestion of the given queue or a write to complete.

In the absence of zone congestion, cond_resched() is called to yield the processor if necessary but otherwise does not sleep.

The return value is 0 if the sleep is for the full timeout. Otherwise, it is the number of jiffies that were still remaining when the function returned. return_value == timeout implies the function did not sleep.

Definition at line 803 of file backing-dev.c.

Variable Documentation

struct backing_dev_info default_backing_dev_info

Initial value:

= {
    .name       = "default",
    .ra_pages   = VM_MAX_READAHEAD * 1024 / PAGE_CACHE_SIZE,
    .state      = 0,
    .capabilities   = BDI_CAP_MAP_COPY,
}

Definition at line 17 of file backing-dev.c.

struct backing_dev_info noop_backing_dev_info

Initial value:

= {
    .name       = "noop",
    .capabilities   = BDI_CAP_NO_ACCT_AND_WRITEBACK,
}

Definition at line 25 of file backing-dev.c.

Macros

Functions

Variables

Macro Definition Documentation

Function Documentation

Variable Documentation