OpenE2K
/
qemu-e2k
13
4
Fork 0
Code Issues 4 Pull Requests Projects 2 Releases Activity

block migration: Fix coding style and whitespaces 

No functional changes.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Jan Kiszka 2009-11-30 18:21:19 +01:00 committed by Anthony Liguori
parent 1302425d73
commit a55eb92c22
4 changed files with 212 additions and 241 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

390
block-migration.c
View File

@ -21,7 +21,7 @@
#define SECTOR_SIZE (1 << SECTOR_BITS)
#define SECTOR_MASK ~(SECTOR_SIZE - 1);
#define BLOCK_SIZE (block_mig_state->sectors_per_block << SECTOR_BITS)
#define BLOCK_SIZE (block_mig_state->sectors_per_block << SECTOR_BITS)
#define BLK_MIG_FLAG_DEVICE_BLOCK 0x01
#define BLK_MIG_FLAG_EOS 0x02
@ -34,13 +34,23 @@
//#define DEBUG_BLK_MIGRATION
#ifdef DEBUG_BLK_MIGRATION
#define dprintf(fmt, ...) \
#define dprintf(fmt, ...) \
do { printf("blk_migration: " fmt, ## __VA_ARGS__); } while (0)
#else
#define dprintf(fmt, ...) \
#define dprintf(fmt, ...) \
do { } while (0)
#endif
typedef struct BlkMigDevState {
BlockDriverState *bs;
int bulk_completed;
int shared_base;
struct BlkMigDevState *next;
int64_t cur_sector;
int64_t total_sectors;
int64_t dirty;
} BlkMigDevState;
typedef struct BlkMigBlock {
uint8_t *buf;
BlkMigDevState *bmds;
@ -68,87 +78,85 @@ typedef struct BlkMigState {
int64_t print_completion;
} BlkMigState;
static BlkMigState *block_mig_state = NULL;
static BlkMigState *block_mig_state = NULL;
static void blk_mig_read_cb(void *opaque, int ret)
{
BlkMigBlock *blk = opaque;
blk->ret = ret;
/* insert at the end */
if(block_mig_state->last_blk == NULL) {
if (block_mig_state->last_blk == NULL) {
block_mig_state->first_blk = blk;
block_mig_state->last_blk = blk;
} else {
block_mig_state->last_blk->next = blk;
block_mig_state->last_blk = blk;
}
block_mig_state->submitted--;
block_mig_state->read_done++;
assert(block_mig_state->submitted >= 0);
return;
}
static int mig_read_device_bulk(QEMUFile *f, BlkMigDevState *bms)
{
{
int nr_sectors;
int64_t total_sectors, cur_sector = 0;
BlockDriverState *bs = bms->bs;
BlkMigBlock *blk;
blk = qemu_malloc(sizeof(BlkMigBlock));
blk->buf = qemu_malloc(BLOCK_SIZE);
cur_sector = bms->cur_sector;
total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
if(bms->shared_base) {
while(cur_sector < bms->total_sectors &&
!bdrv_is_allocated(bms->bs, cur_sector,
MAX_IS_ALLOCATED_SEARCH, &nr_sectors)) {
if (bms->shared_base) {
while (cur_sector < bms->total_sectors &&
!bdrv_is_allocated(bms->bs, cur_sector,
MAX_IS_ALLOCATED_SEARCH, &nr_sectors)) {
cur_sector += nr_sectors;
}
}
if(cur_sector >= total_sectors) {
if (cur_sector >= total_sectors) {
bms->cur_sector = total_sectors;
qemu_free(blk->buf);
qemu_free(blk);
return 1;
}
if(cur_sector >= block_mig_state->print_completion) {
if (cur_sector >= block_mig_state->print_completion) {
printf("Completed %" PRId64 " %%\r", cur_sector * 100 / total_sectors);
fflush(stdout);
block_mig_state->print_completion +=
block_mig_state->print_completion +=
(block_mig_state->sectors_per_block * 10000);
}
/* we going to transfder BLOCK_SIZE any way even if it is not allocated */
nr_sectors = block_mig_state->sectors_per_block;
cur_sector &= ~((int64_t)block_mig_state->sectors_per_block -1);
if(total_sectors - cur_sector < block_mig_state->sectors_per_block) {
if (total_sectors - cur_sector < block_mig_state->sectors_per_block) {
nr_sectors = (total_sectors - cur_sector);
}
bms->cur_sector = cur_sector + nr_sectors;
blk->sector = cur_sector;
blk->bmds = bms;
blk->next = NULL;
blk->iov.iov_base = blk->buf;
blk->iov.iov_len = nr_sectors * SECTOR_SIZE;
qemu_iovec_init_external(&blk->qiov, &blk->iov, 1);
blk->aiocb = bdrv_aio_readv(bs, cur_sector, &blk->qiov,
nr_sectors, blk_mig_read_cb, blk);
if(!blk->aiocb) {
if (!blk->aiocb) {
printf("Error reading sector %" PRId64 "\n", cur_sector);
qemu_free(blk->buf);
qemu_free(blk);
@ -157,91 +165,87 @@ static int mig_read_device_bulk(QEMUFile *f, BlkMigDevState *bms)
bdrv_reset_dirty(bms->bs, cur_sector, nr_sectors);
block_mig_state->submitted++;
return (bms->cur_sector >= total_sectors);
}
static int mig_save_device_bulk(QEMUFile *f, BlkMigDevState *bmds)
{
{
int len, nr_sectors;
int64_t total_sectors = bmds->total_sectors, cur_sector = 0;
uint8_t *tmp_buf = NULL;
BlockDriverState *bs = bmds->bs;
tmp_buf = qemu_malloc(BLOCK_SIZE);
cur_sector = bmds->cur_sector;
if(bmds->shared_base) {
while(cur_sector < bmds->total_sectors &&
!bdrv_is_allocated(bmds->bs, cur_sector,
MAX_IS_ALLOCATED_SEARCH, &nr_sectors)) {
if (bmds->shared_base) {
while (cur_sector < bmds->total_sectors &&
!bdrv_is_allocated(bmds->bs, cur_sector,
MAX_IS_ALLOCATED_SEARCH, &nr_sectors)) {
cur_sector += nr_sectors;
}
}
if(cur_sector >= total_sectors) {
if (cur_sector >= total_sectors) {
bmds->cur_sector = total_sectors;
qemu_free(tmp_buf);
return 1;
}
if(cur_sector >= block_mig_state->print_completion) {
if (cur_sector >= block_mig_state->print_completion) {
printf("Completed %" PRId64 " %%\r", cur_sector * 100 / total_sectors);
fflush(stdout);
block_mig_state->print_completion +=
block_mig_state->print_completion +=
(block_mig_state->sectors_per_block * 10000);
}
cur_sector &= ~((int64_t)block_mig_state->sectors_per_block -1);
/* we going to transfer
BLOCK_SIZE
any way even if it is not allocated */
/* we going to transfer BLOCK_SIZE any way even if it is not allocated */
nr_sectors = block_mig_state->sectors_per_block;
if(total_sectors - cur_sector < block_mig_state->sectors_per_block) {
if (total_sectors - cur_sector < block_mig_state->sectors_per_block) {
nr_sectors = (total_sectors - cur_sector);
}
if(bdrv_read(bs, cur_sector, tmp_buf, nr_sectors) < 0) {
if (bdrv_read(bs, cur_sector, tmp_buf, nr_sectors) < 0) {
printf("Error reading sector %" PRId64 "\n", cur_sector);
}
bdrv_reset_dirty(bs, cur_sector, nr_sectors);
/* Device name */
qemu_put_be64(f,(cur_sector << SECTOR_BITS) | BLK_MIG_FLAG_DEVICE_BLOCK);
/* sector number and flags */
qemu_put_be64(f, (cur_sector << SECTOR_BITS) | BLK_MIG_FLAG_DEVICE_BLOCK);
/* device name */
len = strlen(bs->device_name);
qemu_put_byte(f, len);
qemu_put_buffer(f, (uint8_t *)bs->device_name, len);
qemu_put_buffer(f, tmp_buf,
BLOCK_SIZE);
qemu_put_buffer(f, tmp_buf, BLOCK_SIZE);
bmds->cur_sector = cur_sector + block_mig_state->sectors_per_block;
qemu_free(tmp_buf);
return (bmds->cur_sector >= total_sectors);
}
static void send_blk(QEMUFile *f, BlkMigBlock * blk)
{
int len;
/* Device name */
qemu_put_be64(f,(blk->sector << SECTOR_BITS) | BLK_MIG_FLAG_DEVICE_BLOCK);
/* sector number and flags */
qemu_put_be64(f, (blk->sector << SECTOR_BITS) | BLK_MIG_FLAG_DEVICE_BLOCK);
/* device name */
len = strlen(blk->bmds->bs->device_name);
qemu_put_byte(f, len);
qemu_put_buffer(f, (uint8_t *)blk->bmds->bs->device_name, len);
qemu_put_buffer(f, blk->buf,
BLOCK_SIZE);
return;
qemu_put_buffer(f, blk->buf, BLOCK_SIZE);
}
static void blk_mig_save_dev_info(QEMUFile *f, BlkMigDevState *bmds)
@ -251,47 +255,43 @@ static void blk_mig_save_dev_info(QEMUFile *f, BlkMigDevState *bmds)
static void set_dirty_tracking(int enable)
{
BlkMigDevState *bmds;
for(bmds = block_mig_state->bmds_first; bmds != NULL; bmds = bmds->next) {
bdrv_set_dirty_tracking(bmds->bs,enable);
for (bmds = block_mig_state->bmds_first; bmds != NULL; bmds = bmds->next) {
bdrv_set_dirty_tracking(bmds->bs, enable);
}
return;
}
static void init_blk_migration(QEMUFile *f)
{
BlkMigDevState **pbmds, *bmds;
BlockDriverState *bs;
for (bs = bdrv_first; bs != NULL; bs = bs->next) {
if(bs->type == BDRV_TYPE_HD) {
if (bs->type == BDRV_TYPE_HD) {
bmds = qemu_mallocz(sizeof(BlkMigDevState));
bmds->bs = bs;
bmds->bulk_completed = 0;
bmds->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
bmds->shared_base = block_mig_state->shared_base;
if(bmds->shared_base) {
printf("Start migration for %s with shared base image\n",
if (bmds->shared_base) {
printf("Start migration for %s with shared base image\n",
bs->device_name);
} else {
printf("Start full migration for %s\n", bs->device_name);
}
/* insert at the end */
pbmds = &block_mig_state->bmds_first;
while (*pbmds != NULL)
while (*pbmds != NULL) {
pbmds = &(*pbmds)->next;
}
*pbmds = bmds;
blk_mig_save_dev_info(f, bmds);
}
}
}
block_mig_state->sectors_per_block = bdrv_get_sectors_per_chunk();
return;
}
static int blk_mig_save_bulked_block(QEMUFile *f, int is_async)
@ -299,14 +299,14 @@ static int blk_mig_save_bulked_block(QEMUFile *f, int is_async)
BlkMigDevState *bmds;
for (bmds = block_mig_state->bmds_first; bmds != NULL; bmds = bmds->next) {
if(bmds->bulk_completed == 0) {
if(is_async) {
if(mig_read_device_bulk(f, bmds) == 1) {
if (bmds->bulk_completed == 0) {
if (is_async) {
if (mig_read_device_bulk(f, bmds) == 1) {
/* completed bulk section for this device */
bmds->bulk_completed = 1;
}
} else {
if(mig_save_device_bulk(f,bmds) == 1) {
if (mig_save_device_bulk(f, bmds) == 1) {
/* completed bulk section for this device */
bmds->bulk_completed = 1;
}
@ -314,12 +314,11 @@ static int blk_mig_save_bulked_block(QEMUFile *f, int is_async)
return 1;
}
}
/* we reached here means bulk is completed */
block_mig_state->bulk_completed = 1;
return 0;
}
#define MAX_NUM_BLOCKS 4
@ -330,143 +329,131 @@ static void blk_mig_save_dirty_blocks(QEMUFile *f)
uint8_t buf[BLOCK_SIZE];
int64_t sector;
int len;
for(bmds = block_mig_state->bmds_first; bmds != NULL; bmds = bmds->next) {
for(sector = 0; sector < bmds->cur_sector;) {
if(bdrv_get_dirty(bmds->bs,sector)) {
if(bdrv_read(bmds->bs, sector, buf,
block_mig_state->sectors_per_block) < 0) {
for (bmds = block_mig_state->bmds_first; bmds != NULL; bmds = bmds->next) {
for (sector = 0; sector < bmds->cur_sector;) {
if (bdrv_get_dirty(bmds->bs, sector)) {
if (bdrv_read(bmds->bs, sector, buf,
block_mig_state->sectors_per_block) < 0) {
/* FIXME: add error handling */
}
/* sector number and flags */
qemu_put_be64(f, (sector << SECTOR_BITS)
| BLK_MIG_FLAG_DEVICE_BLOCK);
/* device name */
qemu_put_be64(f,(sector << SECTOR_BITS)
| BLK_MIG_FLAG_DEVICE_BLOCK);
len = strlen(bmds->bs->device_name);
qemu_put_byte(f, len);
qemu_put_buffer(f, (uint8_t *)bmds->bs->device_name, len);
qemu_put_buffer(f, buf,
(block_mig_state->sectors_per_block *
qemu_put_buffer(f, buf,
(block_mig_state->sectors_per_block *
SECTOR_SIZE));
bdrv_reset_dirty(bmds->bs, sector,
bdrv_reset_dirty(bmds->bs, sector,
block_mig_state->sectors_per_block);
sector += block_mig_state->sectors_per_block;
} else {
/* sector is clean */
sector += block_mig_state->sectors_per_block;
}
}
sector += block_mig_state->sectors_per_block;
}
}
return;
}
static void flush_blks(QEMUFile* f)
{
BlkMigBlock *blk, *tmp;
dprintf("%s Enter submitted %d read_done %d transfered\n", __FUNCTION__,
BlkMigBlock *blk, *next;
dprintf("%s Enter submitted %d read_done %d transfered\n", __FUNCTION__,
submitted, read_done, transfered);
for(blk = block_mig_state->first_blk;
blk != NULL && !qemu_file_rate_limit(f); blk = tmp) {
for (blk = block_mig_state->first_blk;
blk != NULL && !qemu_file_rate_limit(f);
blk = next) {
send_blk(f, blk);
tmp = blk->next;
next = blk->next;
qemu_free(blk->buf);
qemu_free(blk);
block_mig_state->read_done--;
block_mig_state->transferred++;
assert(block_mig_state->read_done >= 0);
}
block_mig_state->first_blk = blk;
if(block_mig_state->first_blk == NULL) {
if (block_mig_state->first_blk == NULL) {
block_mig_state->last_blk = NULL;
}
dprintf("%s Exit submitted %d read_done %d transferred%d\n", __FUNCTION__,
block_mig_state->submitted, block_mig_state->read_done,
dprintf("%s Exit submitted %d read_done %d transferred%d\n", __FUNCTION__,
block_mig_state->submitted, block_mig_state->read_done,
block_mig_state->transferred);
return;
}
static int is_stage2_completed(void)
{
BlkMigDevState *bmds;
if(block_mig_state->submitted > 0) {
if (block_mig_state->submitted > 0) {
return 0;
}
for (bmds = block_mig_state->bmds_first; bmds != NULL; bmds = bmds->next) {
if(bmds->bulk_completed == 0) {
if (bmds->bulk_completed == 0) {
return 0;
}
}
return 1;
}
static int block_save_live(QEMUFile *f, int stage, void *opaque)
{
int ret = 1;
dprintf("Enter save live stage %d submitted %d transferred %d\n", stage,
dprintf("Enter save live stage %d submitted %d transferred %d\n", stage,
submitted, transferred);
if(block_mig_state->blk_enable != 1) {
if (block_mig_state->blk_enable != 1) {
/* no need to migrate storage */
qemu_put_be64(f,BLK_MIG_FLAG_EOS);
qemu_put_be64(f, BLK_MIG_FLAG_EOS);
return 1;
}
if(stage == 1) {
if (stage == 1) {
init_blk_migration(f);
/* start track dirty blocks */
set_dirty_tracking(1);
}
flush_blks(f);
/* control the rate of transfer */
while ((block_mig_state->submitted + block_mig_state->read_done) *
(BLOCK_SIZE) <
(qemu_file_get_rate_limit(f))) {
ret = blk_mig_save_bulked_block(f, 1);
if (ret == 0) /* no more bulk blocks for now*/
while ((block_mig_state->submitted +
block_mig_state->read_done) * BLOCK_SIZE <
qemu_file_get_rate_limit(f)) {
if (blk_mig_save_bulked_block(f, 1) == 0) {
/* no more bulk blocks for now */
break;
}
}
flush_blks(f);
if(stage == 3) {
while(blk_mig_save_bulked_block(f, 0) != 0);
if (stage == 3) {
while (blk_mig_save_bulked_block(f, 0) != 0) {
/* empty */
}
blk_mig_save_dirty_blocks(f);
/* stop track dirty blocks */
set_dirty_tracking(0);;
printf("\nBlock migration completed\n");
set_dirty_tracking(0);
printf("\nBlock migration completed\n");
}
qemu_put_be64(f,BLK_MIG_FLAG_EOS);
qemu_put_be64(f, BLK_MIG_FLAG_EOS);
return ((stage == 2) && is_stage2_completed());
}
@ -477,43 +464,39 @@ static int block_load(QEMUFile *f, void *opaque, int version_id)
int64_t addr;
BlockDriverState *bs;
uint8_t *buf;
block_mig_state->sectors_per_block = bdrv_get_sectors_per_chunk();
buf = qemu_malloc(BLOCK_SIZE);
do {
addr = qemu_get_be64(f);
flags = addr & ~SECTOR_MASK;
addr &= SECTOR_MASK;
if(flags & BLK_MIG_FLAG_DEVICE_BLOCK) {
if (flags & BLK_MIG_FLAG_DEVICE_BLOCK) {
/* get device name */
len = qemu_get_byte(f);
qemu_get_buffer(f, (uint8_t *)device_name, len);
device_name[len] = '\0';
bs = bdrv_find(device_name);
qemu_get_buffer(f, buf,
BLOCK_SIZE);
if(bs != NULL) {
bdrv_write(bs, (addr >> SECTOR_BITS),
qemu_get_buffer(f, buf, BLOCK_SIZE);
if (bs != NULL) {
bdrv_write(bs, (addr >> SECTOR_BITS),
buf, block_mig_state->sectors_per_block);
} else {
printf("Error unknown block device %s\n", device_name);
/* FIXME: add error handling */
}
} else if(flags & BLK_MIG_FLAG_EOS) {
} else {
} else if (!(flags & BLK_MIG_FLAG_EOS)) {
printf("Unknown flags\n");
/* FIXME: add error handling */
}
} while(!(flags & BLK_MIG_FLAG_EOS));
} while (!(flags & BLK_MIG_FLAG_EOS));
qemu_free(buf);
return 0;
@ -525,33 +508,28 @@ static void block_set_params(int blk_enable, int shared_base, void *opaque)
block_mig_state->blk_enable = blk_enable;
block_mig_state->shared_base = shared_base;
/* shared base means that blk_enable = 1 */
block_mig_state->blk_enable |= shared_base;
return;
}
void blk_mig_info(void)
{
BlockDriverState *bs;
for (bs = bdrv_first; bs != NULL; bs = bs->next) {
printf("Device %s\n", bs->device_name);
if(bs->type == BDRV_TYPE_HD) {
printf("device %s format %s\n",
if (bs->type == BDRV_TYPE_HD) {
printf("device %s format %s\n",
bs->device_name, bs->drv->format_name);
}
}
}
void blk_mig_init(void)
{
{
block_mig_state = qemu_mallocz(sizeof(BlkMigState));
register_savevm_live("block", 0, 1, block_set_params, block_save_live,
NULL, block_load, block_mig_state);
register_savevm_live("block", 0, 1, block_set_params, block_save_live,
NULL, block_load, block_mig_state);
}

10
block-migration.h
View File

@ -14,16 +14,6 @@
#ifndef BLOCK_MIGRATION_H
#define BLOCK_MIGRATION_H
typedef struct BlkMigDevState {
BlockDriverState *bs;
int bulk_completed;
int shared_base;
struct BlkMigDevState *next;
int64_t cur_sector;
int64_t total_sectors;
int64_t dirty;
} BlkMigDevState;
void blk_mig_init(void);
void blk_mig_info(void);
#endif /* BLOCK_MIGRATION_H */

49
block.c
View File

@ -643,13 +643,14 @@ int bdrv_read(BlockDriverState *bs, int64_t sector_num,
}
static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, int dirty)
int nb_sectors, int dirty)
{
int64_t start, end;
start = sector_num / SECTORS_PER_DIRTY_CHUNK;
end = (sector_num + nb_sectors) / SECTORS_PER_DIRTY_CHUNK;
for(; start <= end; start++) {
for (; start <= end; start++) {
bs->dirty_bitmap[start] = dirty;
}
}
@ -670,11 +671,11 @@ int bdrv_write(BlockDriverState *bs, int64_t sector_num,
return -EACCES;
if (bdrv_check_request(bs, sector_num, nb_sectors))
return -EIO;
if(bs->dirty_tracking) {
if (bs->dirty_tracking) {
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
}
return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
}
@ -1220,11 +1221,11 @@ int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
return -ENOTSUP;
if (bdrv_check_request(bs, sector_num, nb_sectors))
return -EIO;
if(bs->dirty_tracking) {
if (bs->dirty_tracking) {
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
}
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
}
@ -1422,10 +1423,10 @@ BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
if (bdrv_check_request(bs, sector_num, nb_sectors))
return NULL;
if(bs->dirty_tracking) {
if (bs->dirty_tracking) {
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
}
ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors,
cb, opaque);
@ -1966,41 +1967,43 @@ void *qemu_blockalign(BlockDriverState *bs, size_t size)
void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable)
{
int64_t bitmap_size;
if(enable) {
if(bs->dirty_tracking == 0) {
if (enable) {
if (bs->dirty_tracking == 0) {
int64_t i;
uint8_t test;
bitmap_size = (bdrv_getlength(bs) >> SECTOR_BITS);
bitmap_size /= SECTORS_PER_DIRTY_CHUNK;
bitmap_size++;
bs->dirty_bitmap = qemu_mallocz(bitmap_size);
bs->dirty_tracking = enable;
for(i = 0; i < bitmap_size; i++) test = bs->dirty_bitmap[i];
}
}
} else {
if(bs->dirty_tracking != 0) {
if (bs->dirty_tracking != 0) {
qemu_free(bs->dirty_bitmap);
bs->dirty_tracking = enable;
}
}
}
}
int bdrv_get_dirty(BlockDriverState *bs, int64_t sector)
{
int64_t chunk = sector / (int64_t)SECTORS_PER_DIRTY_CHUNK;
if(bs->dirty_bitmap != NULL &&
(sector << SECTOR_BITS) <= bdrv_getlength(bs)) {
if (bs->dirty_bitmap != NULL &&
(sector << SECTOR_BITS) <= bdrv_getlength(bs)) {
return bs->dirty_bitmap[chunk];
} else {
return 0;
}
}
void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
int nr_sectors)
void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
int nr_sectors)
{
set_dirty_bitmap(bs, cur_sector, nr_sectors, 0);
}

4
block.h
View File

@ -190,7 +190,7 @@ int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable);
int bdrv_get_dirty(BlockDriverState *bs, int64_t sector);
void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
int nr_sectors);
void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
int nr_sectors);
int bdrv_get_sectors_per_chunk(void);
#endif