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Count dirty blocks and expose an API to get dirty count

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This will manage dirty counter for each device and will allow to get the
dirty counter from above.

Signed-off-by: Liran Schour <lirans@il.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Liran Schour 2010-01-26 10:31:48 +02:00 committed by Anthony Liguori
parent d76cac7dfb
commit aaa0eb75e2
3 changed files with 16 additions and 2 deletions
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16
block.c
View File

@ -686,9 +686,15 @@ static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num,
bit = start % (sizeof(unsigned long) * 8);
val = bs->dirty_bitmap[idx];
if (dirty) {
val |= 1 << bit;
if (!(val & (1 << bit))) {
bs->dirty_count++;
val |= 1 << bit;
}
} else {
val &= ~(1 << bit);
if (val & (1 << bit)) {
bs->dirty_count--;
val &= ~(1 << bit);
}
}
bs->dirty_bitmap[idx] = val;
}
@ -2139,6 +2145,7 @@ void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable)
{
int64_t bitmap_size;
bs->dirty_count = 0;
if (enable) {
if (!bs->dirty_bitmap) {
bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) +
@ -2173,3 +2180,8 @@ void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
{
set_dirty_bitmap(bs, cur_sector, nr_sectors, 0);
}
int64_t bdrv_get_dirty_count(BlockDriverState *bs)
{
return bs->dirty_count;
}

1
block.h
View File

@ -200,4 +200,5 @@ 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);
int64_t bdrv_get_dirty_count(BlockDriverState *bs);
#endif

1
block_int.h
View File

@ -175,6 +175,7 @@ struct BlockDriverState {
int type;
char device_name[32];
unsigned long *dirty_bitmap;
int64_t dirty_count;
BlockDriverState *next;
void *private;
};