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qcow2: Return error for snapshot operation with data file 

Internal snapshots and an external data file are incompatible because
snapshots require refcounting and non-linear mapping. Return an error
for all of the snapshot operations if an external data file is in use.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2019-02-27 17:25:08 +01:00
parent 966b000f49
commit aa8b34c1b2
1 changed files with 15 additions and 0 deletions
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15
block/qcow2-snapshot.c
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@ -353,6 +353,10 @@ int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
return -EFBIG;
}
if (has_data_file(bs)) {
return -ENOTSUP;
}
memset(sn, 0, sizeof(*sn));
/* Generate an ID */
@ -466,6 +470,10 @@ int qcow2_snapshot_goto(BlockDriverState *bs, const char *snapshot_id)
int ret;
uint64_t *sn_l1_table = NULL;
if (has_data_file(bs)) {
return -ENOTSUP;
}
/* Search the snapshot */
snapshot_index = find_snapshot_by_id_or_name(bs, snapshot_id);
if (snapshot_index < 0) {
@ -599,6 +607,10 @@ int qcow2_snapshot_delete(BlockDriverState *bs,
QCowSnapshot sn;
int snapshot_index, ret;
if (has_data_file(bs)) {
return -ENOTSUP;
}
/* Search the snapshot */
snapshot_index = find_snapshot_by_id_and_name(bs, snapshot_id, name);
if (snapshot_index < 0) {
@ -670,6 +682,9 @@ int qcow2_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab)
QCowSnapshot *sn;
int i;
if (has_data_file(bs)) {
return -ENOTSUP;
}
if (!s->nb_snapshots) {
*psn_tab = NULL;
return s->nb_snapshots;