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block: protect modification of dirty bitmaps with a mutex

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Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20170605123908.18777-17-pbonzini@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
This commit is contained in:
Paolo Bonzini
2017-06-05 14:39:05 +02:00
committed by Fam Zheng
parent c0bad49946
commit b64bd51efa
5 changed files with 95 additions and 25 deletions
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10
migration/block.c
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@@ -525,14 +525,15 @@ static int mig_save_device_dirty(QEMUFile *f, BlkMigDevState *bmds,
} else {
blk_mig_unlock();
}
if (bdrv_get_dirty(bs, bmds->dirty_bitmap, sector)) {
bdrv_dirty_bitmap_lock(bmds->dirty_bitmap);
if (bdrv_get_dirty_locked(bs, bmds->dirty_bitmap, sector)) {
if (total_sectors - sector < BDRV_SECTORS_PER_DIRTY_CHUNK) {
nr_sectors = total_sectors - sector;
} else {
nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK;
}
bdrv_reset_dirty_bitmap(bmds->dirty_bitmap, sector, nr_sectors);
bdrv_reset_dirty_bitmap_locked(bmds->dirty_bitmap, sector, nr_sectors);
bdrv_dirty_bitmap_unlock(bmds->dirty_bitmap);
blk = g_new(BlkMigBlock, 1);
blk->buf = g_malloc(BLOCK_SIZE);
@@ -568,9 +569,10 @@ static int mig_save_device_dirty(QEMUFile *f, BlkMigDevState *bmds,
sector += nr_sectors;
bmds->cur_dirty = sector;
break;
}
bdrv_dirty_bitmap_unlock(bmds->dirty_bitmap);
sector += BDRV_SECTORS_PER_DIRTY_CHUNK;
bmds->cur_dirty = sector;
}