#include <linux/percpu_counter.h>
#include <linux/log2.h>
#include <linux/flex_proportions.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/writeback.h>
#include <linux/atomic.h>
#include <linux/sysctl.h>

Data Structures
struct	bdi_writeback

struct	backing_dev_info

Macros
#define	BDI_STAT_BATCH (8*(1+ilog2(nr_cpu_ids)))

#define	BDI_CAP_NO_ACCT_DIRTY 0x00000001

#define	BDI_CAP_NO_WRITEBACK 0x00000002

#define	BDI_CAP_MAP_COPY 0x00000004

#define	BDI_CAP_MAP_DIRECT 0x00000008

#define	BDI_CAP_READ_MAP 0x00000010

#define	BDI_CAP_WRITE_MAP 0x00000020

#define	BDI_CAP_EXEC_MAP 0x00000040

#define	BDI_CAP_NO_ACCT_WB 0x00000080

#define	BDI_CAP_SWAP_BACKED 0x00000100

#define	BDI_CAP_VMFLAGS (BDI_CAP_READ_MAP \| BDI_CAP_WRITE_MAP \| BDI_CAP_EXEC_MAP)

#define	BDI_CAP_NO_ACCT_AND_WRITEBACK (BDI_CAP_NO_WRITEBACK \| BDI_CAP_NO_ACCT_DIRTY \| BDI_CAP_NO_ACCT_WB)

Typedefs
typedef int(	congested_fn )(void *, int)

Enumerations
enum	bdi_state { BDI_pending, BDI_wb_alloc, BDI_async_congested, BDI_sync_congested, BDI_registered, BDI_writeback_running, BDI_unused }

enum	bdi_stat_item { BDI_RECLAIMABLE, BDI_WRITEBACK, BDI_DIRTIED, BDI_WRITTEN, NR_BDI_STAT_ITEMS }

enum	{ BLK_RW_ASYNC = 0, BLK_RW_SYNC = 1 }

Functions
int	bdi_init (struct backing_dev_info *bdi)

void	bdi_destroy (struct backing_dev_info *bdi)

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

int	bdi_register_dev (struct backing_dev_info *bdi, dev_t dev)

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, enum wb_reason reason)

void	bdi_start_background_writeback (struct backing_dev_info *bdi)

int	bdi_writeback_thread (void *data)

int	bdi_has_dirty_io (struct backing_dev_info *bdi)

void	bdi_wakeup_thread_delayed (struct backing_dev_info *bdi)

void	bdi_lock_two (struct bdi_writeback wb1, struct bdi_writeback wb2)

void	bdi_writeout_inc (struct backing_dev_info *bdi)

int	bdi_set_min_ratio (struct backing_dev_info *bdi, unsigned int min_ratio)

int	bdi_set_max_ratio (struct backing_dev_info *bdi, unsigned int max_ratio)

int	writeback_in_progress (struct backing_dev_info *bdi)

void	clear_bdi_congested (struct backing_dev_info *bdi, int sync)

void	set_bdi_congested (struct backing_dev_info *bdi, int sync)

long	congestion_wait (int sync, long timeout)

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

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

Variables
spinlock_t	bdi_lock

struct list_head	bdi_list

struct list_head	bdi_pending_list

struct backing_dev_info	default_backing_dev_info

struct backing_dev_info	noop_backing_dev_info

Macro Definition Documentation

#define BDI_CAP_EXEC_MAP 0x00000040

Definition at line 253 of file backing-dev.h.

#define BDI_CAP_MAP_COPY 0x00000004

Definition at line 249 of file backing-dev.h.

#define BDI_CAP_MAP_DIRECT 0x00000008

Definition at line 250 of file backing-dev.h.

#define BDI_CAP_NO_ACCT_AND_WRITEBACK (BDI_CAP_NO_WRITEBACK | BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_ACCT_WB)

Definition at line 260 of file backing-dev.h.

#define BDI_CAP_NO_ACCT_DIRTY 0x00000001

Definition at line 247 of file backing-dev.h.

#define BDI_CAP_NO_ACCT_WB 0x00000080

Definition at line 254 of file backing-dev.h.

#define BDI_CAP_NO_WRITEBACK 0x00000002

Definition at line 248 of file backing-dev.h.

#define BDI_CAP_READ_MAP 0x00000010

Definition at line 251 of file backing-dev.h.

#define BDI_CAP_SWAP_BACKED 0x00000100

Definition at line 255 of file backing-dev.h.

#define BDI_CAP_VMFLAGS (BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP)

Definition at line 257 of file backing-dev.h.

#define BDI_CAP_WRITE_MAP 0x00000020

Definition at line 252 of file backing-dev.h.

#define BDI_STAT_BATCH (8*(1+ilog2(nr_cpu_ids)))

Definition at line 49 of file backing-dev.h.

Typedef Documentation

typedef int( congested_fn)(void *, int)

Definition at line 39 of file backing-dev.h.

Enumeration Type Documentation

anonymous enum

Enumerator:

BLK_RW_ASYNC
BLK_RW_SYNC

Definition at line 298 of file backing-dev.h.

enum bdi_stat_item

Enumerator:

BDI_RECLAIMABLE
BDI_WRITEBACK
BDI_DIRTIED
BDI_WRITTEN
NR_BDI_STAT_ITEMS

Definition at line 41 of file backing-dev.h.

enum bdi_state

Enumerator:

BDI_pending
BDI_wb_alloc
BDI_async_congested
BDI_sync_congested
BDI_registered
BDI_writeback_running
BDI_unused

Definition at line 29 of file backing-dev.h.

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_set_max_ratio	(	struct backing_dev_info *	bdi,
		unsigned int	max_ratio
	)

int bdi_set_min_ratio	(	struct backing_dev_info *	bdi,
		unsigned int	min_ratio
	)

Definition at line 473 of file page-writeback.c.

int bdi_setup_and_register	(	struct backing_dev_info *	,
		char *	,
		unsigned	int
	)

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

void bdi_start_background_writeback ( struct backing_dev_info * bdi )

bdi_start_background_writeback - start background writeback : the backing device to write from

Description: This makes sure WB_SYNC_NONE background writeback happens. When this function returns, it is only guaranteed that for given BDI some IO is happening if we are over background dirty threshold. Caller need not hold sb s_umount semaphore.

Definition at line 173 of file fs-writeback.c.

void bdi_start_writeback	(	struct backing_dev_info *	bdi,
		long	nr_pages,
		enum wb_reason	reason
	)

bdi_start_writeback - start writeback : the backing device to write from : the number of pages to write : reason why some writeback work was initiated

Description: This does WB_SYNC_NONE opportunistic writeback. The IO is only started when this function returns, we make no guarantees on completion. Caller need not hold sb s_umount semaphore.

Definition at line 157 of file fs-writeback.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.

int bdi_writeback_thread ( void * data )

Definition at line 1017 of file fs-writeback.c.

void bdi_writeout_inc ( struct backing_dev_info * bdi )

Definition at line 424 of file page-writeback.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.

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.

void set_bdi_congested	(	struct backing_dev_info *	bdi,
		int	sync
	)

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

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.

int writeback_in_progress ( struct backing_dev_info * bdi )

writeback_in_progress - determine whether there is writeback in progress : the device's backing_dev_info structure.

Determine whether there is writeback waiting to be handled against a backing device.

Definition at line 62 of file fs-writeback.c.

Variable Documentation

struct list_head bdi_list

spinlock_t bdi_lock

struct list_head bdi_pending_list

struct backing_dev_info default_backing_dev_info

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

struct backing_dev_info noop_backing_dev_info

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

Data Structures

Macros

Typedefs

Enumerations

Functions

Variables

Macro Definition Documentation

Typedef Documentation

Enumeration Type Documentation

Function Documentation

Variable Documentation