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dirty-bitmap: Change bdrv_[re]set_dirty_bitmap() to use bytes 

Some of the callers were already scaling bytes to sectors; others
can be easily converted to pass byte offsets, all in our shift
towards a consistent byte interface everywhere.  Making the change
will also make it easier to write the hold-out callers to use byte
rather than sectors for their iterations; it also makes it easier
for a future dirty-bitmap patch to offload scaling over to the
internal hbitmap.  Although all callers happen to pass
sector-aligned values, make the internal scaling robust to any
sub-sector requests.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Eric Blake 2017-09-25 09:55:20 -05:00 committed by Kevin Wolf
parent 3b5d4df0c6
commit e0d7f73e63
4 changed files with 31 additions and 22 deletions
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22
block/dirty-bitmap.c
View File

@ -509,35 +509,41 @@ int64_t bdrv_dirty_iter_next(BdrvDirtyBitmapIter *iter)
/* Called within bdrv_dirty_bitmap_lock..unlock */
void bdrv_set_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap,
int64_t cur_sector, int64_t nr_sectors)
int64_t offset, int64_t bytes)
{
int64_t end_sector = DIV_ROUND_UP(offset + bytes, BDRV_SECTOR_SIZE);
assert(bdrv_dirty_bitmap_enabled(bitmap));
assert(!bdrv_dirty_bitmap_readonly(bitmap));
hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors);
hbitmap_set(bitmap->bitmap, offset >> BDRV_SECTOR_BITS,
end_sector - (offset >> BDRV_SECTOR_BITS));
}
void bdrv_set_dirty_bitmap(BdrvDirtyBitmap *bitmap,
int64_t cur_sector, int64_t nr_sectors)
int64_t offset, int64_t bytes)
{
bdrv_dirty_bitmap_lock(bitmap);
bdrv_set_dirty_bitmap_locked(bitmap, cur_sector, nr_sectors);
bdrv_set_dirty_bitmap_locked(bitmap, offset, bytes);
bdrv_dirty_bitmap_unlock(bitmap);
}
/* Called within bdrv_dirty_bitmap_lock..unlock */
void bdrv_reset_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap,
int64_t cur_sector, int64_t nr_sectors)
int64_t offset, int64_t bytes)
{
int64_t end_sector = DIV_ROUND_UP(offset + bytes, BDRV_SECTOR_SIZE);
assert(bdrv_dirty_bitmap_enabled(bitmap));
assert(!bdrv_dirty_bitmap_readonly(bitmap));
hbitmap_reset(bitmap->bitmap, cur_sector, nr_sectors);
hbitmap_reset(bitmap->bitmap, offset >> BDRV_SECTOR_BITS,
end_sector - (offset >> BDRV_SECTOR_BITS));
}
void bdrv_reset_dirty_bitmap(BdrvDirtyBitmap *bitmap,
int64_t cur_sector, int64_t nr_sectors)
int64_t offset, int64_t bytes)
{
bdrv_dirty_bitmap_lock(bitmap);
bdrv_reset_dirty_bitmap_locked(bitmap, cur_sector, nr_sectors);
bdrv_reset_dirty_bitmap_locked(bitmap, offset, bytes);
bdrv_dirty_bitmap_unlock(bitmap);
}

16
block/mirror.c
View File

@ -141,8 +141,7 @@ static void mirror_write_complete(void *opaque, int ret)
if (ret < 0) {
BlockErrorAction action;
bdrv_set_dirty_bitmap(s->dirty_bitmap, op->offset >> BDRV_SECTOR_BITS,
op->bytes >> BDRV_SECTOR_BITS);
bdrv_set_dirty_bitmap(s->dirty_bitmap, op->offset, op->bytes);
action = mirror_error_action(s, false, -ret);
if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) {
s->ret = ret;
@ -161,8 +160,7 @@ static void mirror_read_complete(void *opaque, int ret)
if (ret < 0) {
BlockErrorAction action;
bdrv_set_dirty_bitmap(s->dirty_bitmap, op->offset >> BDRV_SECTOR_BITS,
op->bytes >> BDRV_SECTOR_BITS);
bdrv_set_dirty_bitmap(s->dirty_bitmap, op->offset, op->bytes);
action = mirror_error_action(s, true, -ret);
if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) {
s->ret = ret;
@ -382,8 +380,8 @@ static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s)
* calling bdrv_get_block_status_above could yield - if some blocks are
* marked dirty in this window, we need to know.
*/
bdrv_reset_dirty_bitmap_locked(s->dirty_bitmap, offset >> BDRV_SECTOR_BITS,
nb_chunks * sectors_per_chunk);
bdrv_reset_dirty_bitmap_locked(s->dirty_bitmap, offset,
nb_chunks * s->granularity);
bdrv_dirty_bitmap_unlock(s->dirty_bitmap);
bitmap_set(s->in_flight_bitmap, offset / s->granularity, nb_chunks);
@ -625,7 +623,7 @@ static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s)
if (base == NULL && !bdrv_has_zero_init(target_bs)) {
if (!bdrv_can_write_zeroes_with_unmap(target_bs)) {
bdrv_set_dirty_bitmap(s->dirty_bitmap, 0, end);
bdrv_set_dirty_bitmap(s->dirty_bitmap, 0, s->bdev_length);
return 0;
}
@ -681,7 +679,9 @@ static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s)
n = count >> BDRV_SECTOR_BITS;
assert(n > 0);
if (ret == 1) {
bdrv_set_dirty_bitmap(s->dirty_bitmap, sector_num, n);
bdrv_set_dirty_bitmap(s->dirty_bitmap,
sector_num * BDRV_SECTOR_SIZE,
n * BDRV_SECTOR_SIZE);
}
sector_num += n;
}

8
include/block/dirty-bitmap.h
View File

@ -40,9 +40,9 @@ const char *bdrv_dirty_bitmap_name(const BdrvDirtyBitmap *bitmap);
int64_t bdrv_dirty_bitmap_size(const BdrvDirtyBitmap *bitmap);
DirtyBitmapStatus bdrv_dirty_bitmap_status(BdrvDirtyBitmap *bitmap);
void bdrv_set_dirty_bitmap(BdrvDirtyBitmap *bitmap,
int64_t cur_sector, int64_t nr_sectors);
int64_t offset, int64_t bytes);
void bdrv_reset_dirty_bitmap(BdrvDirtyBitmap *bitmap,
int64_t cur_sector, int64_t nr_sectors);
int64_t offset, int64_t bytes);
BdrvDirtyBitmapIter *bdrv_dirty_meta_iter_new(BdrvDirtyBitmap *bitmap);
BdrvDirtyBitmapIter *bdrv_dirty_iter_new(BdrvDirtyBitmap *bitmap);
void bdrv_dirty_iter_free(BdrvDirtyBitmapIter *iter);
@ -75,9 +75,9 @@ void bdrv_dirty_bitmap_unlock(BdrvDirtyBitmap *bitmap);
bool bdrv_get_dirty_locked(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
int64_t offset);
void bdrv_set_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap,
int64_t cur_sector, int64_t nr_sectors);
int64_t offset, int64_t bytes);
void bdrv_reset_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap,
int64_t cur_sector, int64_t nr_sectors);
int64_t offset, int64_t bytes);
int64_t bdrv_dirty_iter_next(BdrvDirtyBitmapIter *iter);
void bdrv_set_dirty_iter(BdrvDirtyBitmapIter *hbi, int64_t offset);
int64_t bdrv_get_dirty_count(BdrvDirtyBitmap *bitmap);

7
migration/block.c
View File

@ -334,7 +334,8 @@ static int mig_save_device_bulk(QEMUFile *f, BlkMigDevState *bmds)
blk->aiocb = blk_aio_preadv(bb, cur_sector * BDRV_SECTOR_SIZE, &blk->qiov,
0, blk_mig_read_cb, blk);
bdrv_reset_dirty_bitmap(bmds->dirty_bitmap, cur_sector, nr_sectors);
bdrv_reset_dirty_bitmap(bmds->dirty_bitmap, cur_sector * BDRV_SECTOR_SIZE,
nr_sectors * BDRV_SECTOR_SIZE);
aio_context_release(blk_get_aio_context(bmds->blk));
qemu_mutex_unlock_iothread();
@ -542,7 +543,9 @@ static int mig_save_device_dirty(QEMUFile *f, BlkMigDevState *bmds,
} else {
nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK;
}
bdrv_reset_dirty_bitmap_locked(bmds->dirty_bitmap, sector, nr_sectors);
bdrv_reset_dirty_bitmap_locked(bmds->dirty_bitmap,
sector * BDRV_SECTOR_SIZE,
nr_sectors * BDRV_SECTOR_SIZE);
bdrv_dirty_bitmap_unlock(bmds->dirty_bitmap);
blk = g_new(BlkMigBlock, 1);