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block migration: Skip zero-sized disks

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No need to migrate emptiness (risking divide by zero later on).

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 20:34:55 +01:00 • committed by Anthony Liguori
parent 23bd90d2f9
commit 792773b225
1 changed files with 8 additions and 2 deletions
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10
block-migration.c
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@ -222,6 +222,7 @@ static void init_blk_migration(Monitor *mon, QEMUFile *f)
{ {
BlkMigDevState *bmds; BlkMigDevState *bmds;
BlockDriverState *bs; BlockDriverState *bs;
int64_t sectors;
block_mig_state.submitted = 0; block_mig_state.submitted = 0;
block_mig_state.read_done = 0; block_mig_state.read_done = 0;
@ -231,14 +232,19 @@ static void init_blk_migration(Monitor *mon, QEMUFile *f)
for (bs = bdrv_first; bs != NULL; bs = bs->next) { for (bs = bdrv_first; bs != NULL; bs = bs->next) {
if (bs->type == BDRV_TYPE_HD) { if (bs->type == BDRV_TYPE_HD) {
sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
if (sectors == 0) {
continue;
}
bmds = qemu_mallocz(sizeof(BlkMigDevState)); bmds = qemu_mallocz(sizeof(BlkMigDevState));
bmds->bs = bs; bmds->bs = bs;
bmds->bulk_completed = 0; bmds->bulk_completed = 0;
bmds->total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; bmds->total_sectors = sectors;
bmds->completed_sectors = 0; bmds->completed_sectors = 0;
bmds->shared_base = block_mig_state.shared_base; bmds->shared_base = block_mig_state.shared_base;
block_mig_state.total_sector_sum += bmds->total_sectors; block_mig_state.total_sector_sum += sectors;
if (bmds->shared_base) { if (bmds->shared_base) {
monitor_printf(mon, "Start migration for %s with shared base " monitor_printf(mon, "Start migration for %s with shared base "