#include <linux/bitops.h>
#include <linux/vmalloc.h>
#include <linux/string.h>
#include <linux/drbd.h>
#include <linux/slab.h>
#include <asm/kmap_types.h>
#include "drbd_int.h"

Data Structures
struct	drbd_bitmap

struct	bm_aio_ctx

Macros
#define	bm_print_lock_info(m) __bm_print_lock_info(m, __func__)

#define	BM_PAGE_IDX_MASK ((1UL<<24)-1)

#define	BM_PAGE_IO_LOCK 31

#define	BM_PAGE_IO_ERROR 30

#define	BM_PAGE_NEED_WRITEOUT 29

#define	BM_PAGE_LAZY_WRITEOUT 28

#define	S2W(s) ((s)<<(BM_EXT_SHIFT-BM_BLOCK_SHIFT-LN2_BPL))

#define	MLPP(X) ((X) & ((PAGE_SIZE/sizeof(long))-1))

#define	LWPP (PAGE_SIZE/sizeof(long))

#define	BITS_PER_PAGE (1UL << (PAGE_SHIFT + 3))

#define	BITS_PER_PAGE_MASK (BITS_PER_PAGE - 1)

#define	BITS_PER_LONG_MASK (BITS_PER_LONG - 1)

#define	BM_AIO_COPY_PAGES 1

#define	BM_WRITE_ALL_PAGES 2

Functions
void	drbd_bm_lock (struct drbd_conf mdev, char why, enum bm_flag flags)

void	drbd_bm_unlock (struct drbd_conf *mdev)

int	drbd_bm_init (struct drbd_conf *mdev)

sector_t	drbd_bm_capacity (struct drbd_conf *mdev)

void	drbd_bm_cleanup (struct drbd_conf *mdev)

int	drbd_bm_resize (struct drbd_conf *mdev, sector_t capacity, int set_new_bits)

unsigned long	_drbd_bm_total_weight (struct drbd_conf *mdev)

unsigned long	drbd_bm_total_weight (struct drbd_conf *mdev)

size_t	drbd_bm_words (struct drbd_conf *mdev)

unsigned long	drbd_bm_bits (struct drbd_conf *mdev)

void	drbd_bm_merge_lel (struct drbd_conf mdev, size_t offset, size_t number, unsigned long buffer)

void	drbd_bm_get_lel (struct drbd_conf mdev, size_t offset, size_t number, unsigned long buffer)

void	drbd_bm_set_all (struct drbd_conf *mdev)

void	drbd_bm_clear_all (struct drbd_conf *mdev)

int	drbd_bm_read (struct drbd_conf *mdev) __must_hold(local)

int	drbd_bm_write (struct drbd_conf *mdev) __must_hold(local)

int	drbd_bm_write_all (struct drbd_conf *mdev) __must_hold(local)

int	drbd_bm_write_lazy (struct drbd_conf *mdev, unsigned upper_idx) __must_hold(local)

int	drbd_bm_write_copy_pages (struct drbd_conf *mdev) __must_hold(local)

int	drbd_bm_write_page (struct drbd_conf *mdev, unsigned int idx) __must_hold(local)

unsigned long	drbd_bm_find_next (struct drbd_conf *mdev, unsigned long bm_fo)

unsigned long	_drbd_bm_find_next (struct drbd_conf *mdev, unsigned long bm_fo)

unsigned long	_drbd_bm_find_next_zero (struct drbd_conf *mdev, unsigned long bm_fo)

int	drbd_bm_set_bits (struct drbd_conf *mdev, const unsigned long s, const unsigned long e)

int	drbd_bm_clear_bits (struct drbd_conf *mdev, const unsigned long s, const unsigned long e)

void	_drbd_bm_set_bits (struct drbd_conf *mdev, const unsigned long s, const unsigned long e)

int	drbd_bm_test_bit (struct drbd_conf *mdev, const unsigned long bitnr)

int	drbd_bm_count_bits (struct drbd_conf *mdev, const unsigned long s, const unsigned long e)

int	drbd_bm_e_weight (struct drbd_conf *mdev, unsigned long enr)

unsigned long	drbd_bm_ALe_set_all (struct drbd_conf *mdev, unsigned long al_enr)

Macro Definition Documentation

#define BITS_PER_LONG_MASK (BITS_PER_LONG - 1)

Definition at line 464 of file drbd_bitmap.c.

#define BITS_PER_PAGE (1UL << (PAGE_SHIFT + 3))

Definition at line 462 of file drbd_bitmap.c.

#define BITS_PER_PAGE_MASK (BITS_PER_PAGE - 1)

Definition at line 463 of file drbd_bitmap.c.

#define BM_AIO_COPY_PAGES 1

Definition at line 891 of file drbd_bitmap.c.

#define BM_PAGE_IDX_MASK ((1UL<<24)-1)

Definition at line 188 of file drbd_bitmap.c.

#define BM_PAGE_IO_ERROR 30

Definition at line 192 of file drbd_bitmap.c.

#define BM_PAGE_IO_LOCK 31

Definition at line 190 of file drbd_bitmap.c.

#define BM_PAGE_LAZY_WRITEOUT 28

Definition at line 198 of file drbd_bitmap.c.

#define BM_PAGE_NEED_WRITEOUT 29

Definition at line 195 of file drbd_bitmap.c.

#define bm_print_lock_info ( m ) __bm_print_lock_info(m, __func__)

Definition at line 115 of file drbd_bitmap.c.

#define BM_WRITE_ALL_PAGES 2

Definition at line 892 of file drbd_bitmap.c.

#define LWPP (PAGE_SIZE/sizeof(long))

Definition at line 324 of file drbd_bitmap.c.

#define MLPP ( X ) ((X) & ((PAGE_SIZE/sizeof(long))-1))

Definition at line 321 of file drbd_bitmap.c.

#define S2W ( s ) ((s)<<(BM_EXT_SHIFT-BM_BLOCK_SHIFT-LN2_BPL))

Definition at line 314 of file drbd_bitmap.c.

Function Documentation

unsigned long _drbd_bm_find_next	(	struct drbd_conf *	mdev,
		unsigned long	bm_fo
	)

Definition at line 1320 of file drbd_bitmap.c.

unsigned long _drbd_bm_find_next_zero	(	struct drbd_conf *	mdev,
		unsigned long	bm_fo
	)

Definition at line 1326 of file drbd_bitmap.c.

void _drbd_bm_set_bits	(	struct drbd_conf *	mdev,
		const unsigned long	s,
		const unsigned long	e
	)

Definition at line 1440 of file drbd_bitmap.c.

unsigned long _drbd_bm_total_weight ( struct drbd_conf * mdev )

Definition at line 729 of file drbd_bitmap.c.

unsigned long drbd_bm_ALe_set_all	(	struct drbd_conf *	mdev,
		unsigned long	al_enr
	)

Definition at line 1636 of file drbd_bitmap.c.

unsigned long drbd_bm_bits ( struct drbd_conf * mdev )

Definition at line 765 of file drbd_bitmap.c.

sector_t drbd_bm_capacity ( struct drbd_conf * mdev )

Definition at line 440 of file drbd_bitmap.c.

void drbd_bm_cleanup ( struct drbd_conf * mdev )

Definition at line 448 of file drbd_bitmap.c.

void drbd_bm_clear_all ( struct drbd_conf * mdev )

Definition at line 874 of file drbd_bitmap.c.

int drbd_bm_clear_bits	(	struct drbd_conf *	mdev,
		const unsigned long	s,
		const unsigned long	e
	)

Definition at line 1414 of file drbd_bitmap.c.

int drbd_bm_count_bits	(	struct drbd_conf *	mdev,
		const unsigned long	s,
		const unsigned long	e
	)

Definition at line 1549 of file drbd_bitmap.c.

int drbd_bm_e_weight	(	struct drbd_conf *	mdev,
		unsigned long	enr
	)

Definition at line 1603 of file drbd_bitmap.c.

unsigned long drbd_bm_find_next	(	struct drbd_conf *	mdev,
		unsigned long	bm_fo
	)

Definition at line 1305 of file drbd_bitmap.c.

void drbd_bm_get_lel	(	struct drbd_conf *	mdev,
		size_t	offset,
		size_t	number,
		unsigned long *	buffer
	)

Definition at line 825 of file drbd_bitmap.c.

int drbd_bm_init ( struct drbd_conf * mdev )

Definition at line 424 of file drbd_bitmap.c.

void drbd_bm_lock	(	struct drbd_conf *	mdev,
		char *	why,
		enum bm_flag	flags
	)

Definition at line 131 of file drbd_bitmap.c.

void drbd_bm_merge_lel	(	struct drbd_conf *	mdev,
		size_t	offset,
		size_t	number,
		unsigned long *	buffer
	)

Definition at line 778 of file drbd_bitmap.c.

int drbd_bm_read ( struct drbd_conf * mdev )

drbd_bm_read() - Read the whole bitmap from its on disk location. : DRBD device.

Definition at line 1129 of file drbd_bitmap.c.

int drbd_bm_resize	(	struct drbd_conf *	mdev,
		sector_t	capacity,
		int	set_new_bits
	)

Definition at line 604 of file drbd_bitmap.c.

void drbd_bm_set_all ( struct drbd_conf * mdev )

Definition at line 860 of file drbd_bitmap.c.

int drbd_bm_set_bits	(	struct drbd_conf *	mdev,
		const unsigned long	s,
		const unsigned long	e
	)

Definition at line 1408 of file drbd_bitmap.c.

int drbd_bm_test_bit	(	struct drbd_conf *	mdev,
		const unsigned long	bitnr
	)

Definition at line 1520 of file drbd_bitmap.c.

unsigned long drbd_bm_total_weight ( struct drbd_conf * mdev )

Definition at line 745 of file drbd_bitmap.c.

void drbd_bm_unlock ( struct drbd_conf * mdev )

Definition at line 162 of file drbd_bitmap.c.

size_t drbd_bm_words ( struct drbd_conf * mdev )

Definition at line 756 of file drbd_bitmap.c.

int drbd_bm_write ( struct drbd_conf * mdev )

drbd_bm_write() - Write the whole bitmap to its on disk location. : DRBD device.

Will only write pages that have changed since last IO.

Definition at line 1140 of file drbd_bitmap.c.

int drbd_bm_write_all ( struct drbd_conf * mdev )

drbd_bm_write_all() - Write the whole bitmap to its on disk location. : DRBD device.

Will write all pages.

Definition at line 1151 of file drbd_bitmap.c.

int drbd_bm_write_copy_pages ( struct drbd_conf * mdev )

drbd_bm_write_copy_pages() - Write the whole bitmap to its on disk location. : DRBD device.

Will only write pages that have changed since last IO. In contrast to drbd_bm_write(), this will copy the bitmap pages to temporary writeout pages. It is intended to trigger a full write-out while still allowing the bitmap to change, for example if a resync or online verify is aborted due to a failed peer disk, while local IO continues, or pending resync acks are still being processed.

Definition at line 1177 of file drbd_bitmap.c.

int drbd_bm_write_lazy	(	struct drbd_conf *	mdev,
		unsigned	upper_idx
	)

drbd_bm_lazy_write_out() - Write bitmap pages 0 to -1, if they have changed. : DRBD device. : 0: write all changed pages; +ve: page index to stop scanning for changed pages

Definition at line 1161 of file drbd_bitmap.c.

int drbd_bm_write_page	(	struct drbd_conf *	mdev,
		unsigned int	idx
	)

drbd_bm_write_page: Writes a PAGE_SIZE aligned piece of bitmap : DRBD device. : bitmap page index

We don't want to special case on logical_block_size of the backend device, so we submit PAGE_SIZE aligned pieces. Note that on "most" systems, PAGE_SIZE is 4k.

In case this becomes an issue on systems with larger PAGE_SIZE, we may want to change this again to write 4k aligned 4k pieces.

Definition at line 1195 of file drbd_bitmap.c.

Data Structures

Macros

Functions

Macro Definition Documentation

Function Documentation