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qcow: Add migration blocker 

qcow caches L2 tables. For migration to work, they would have to be
invalidated. Block migration for now.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2011-11-22 16:44:45 +01:00
parent c3fecea50d
commit fd9f102c3e
1 changed files with 12 additions and 0 deletions
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12
block/qcow.c
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@ -26,6 +26,7 @@
#include "module.h"
#include <zlib.h>
#include "aes.h"
#include "migration.h"
/**************************************************************/
/* QEMU COW block driver with compression and encryption support */
@ -74,6 +75,7 @@ typedef struct BDRVQcowState {
AES_KEY aes_encrypt_key;
AES_KEY aes_decrypt_key;
CoMutex lock;
Error *migration_blocker;
} BDRVQcowState;
static int decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset);
@ -160,6 +162,12 @@ static int qcow_open(BlockDriverState *bs, int flags)
bs->backing_file[len] = '\0';
}
/* Disable migration when qcow images are used */
error_set(&s->migration_blocker,
QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
"qcow", bs->device_name, "live migration");
migrate_add_blocker(s->migration_blocker);
qemu_co_mutex_init(&s->lock);
return 0;
@ -604,10 +612,14 @@ static int qcow_co_writev(BlockDriverState *bs, int64_t sector_num,
static void qcow_close(BlockDriverState *bs)
{
BDRVQcowState *s = bs->opaque;
g_free(s->l1_table);
g_free(s->l2_cache);
g_free(s->cluster_cache);
g_free(s->cluster_data);
migrate_del_blocker(s->migration_blocker);
error_free(s->migration_blocker);
}
static int qcow_create(const char *filename, QEMUOptionParameter *options)