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authorJohn Snow <jsnow@redhat.com>2019-01-11 11:59:16 -0600
committerEric Blake <eblake@redhat.com>2019-01-14 10:08:47 -0600
commitf4de0f8c40b70c4c9308b4670e0a6ad9faed0262 (patch)
tree5cd6f77de676bcce66818feaaf95c11376ddaa3e /blockdev.c
parent7260438b7056469610ee166f7abe9ff8a26b8b16 (diff)
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blockdev: abort transactions in reverse order
Presently, we abort transactions in the same order they were processed in. Bitmap commands, though, attempt to restore backup data structures on abort. That's not valid, they need to be aborted in reverse chronological order. Replace the QSIMPLEQ data structure with a QTAILQ one, so we can iterate in reverse for the abort phase of the transaction. Signed-off-by: John Snow <jsnow@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20181221093529.23855-2-jsnow@redhat.com> [eblake: rebase] Signed-off-by: Eric Blake <eblake@redhat.com>
Diffstat (limited to 'blockdev.c')
-rw-r--r--blockdev.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/blockdev.c b/blockdev.c
index 1cc893f..3d46f81 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1339,7 +1339,7 @@ struct BlkActionState {
const BlkActionOps *ops;
JobTxn *block_job_txn;
TransactionProperties *txn_props;
- QSIMPLEQ_ENTRY(BlkActionState) entry;
+ QTAILQ_ENTRY(BlkActionState) entry;
};
/* internal snapshot private data */
@@ -2266,8 +2266,8 @@ void qmp_transaction(TransactionActionList *dev_list,
BlkActionState *state, *next;
Error *local_err = NULL;
- QSIMPLEQ_HEAD(, BlkActionState) snap_bdrv_states;
- QSIMPLEQ_INIT(&snap_bdrv_states);
+ QTAILQ_HEAD(, BlkActionState) snap_bdrv_states;
+ QTAILQ_INIT(&snap_bdrv_states);
/* Does this transaction get canceled as a group on failure?
* If not, we don't really need to make a JobTxn.
@@ -2298,7 +2298,7 @@ void qmp_transaction(TransactionActionList *dev_list,
state->action = dev_info;
state->block_job_txn = block_job_txn;
state->txn_props = props;
- QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
+ QTAILQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
state->ops->prepare(state, &local_err);
if (local_err) {
@@ -2307,7 +2307,7 @@ void qmp_transaction(TransactionActionList *dev_list,
}
}
- QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
+ QTAILQ_FOREACH(state, &snap_bdrv_states, entry) {
if (state->ops->commit) {
state->ops->commit(state);
}
@@ -2318,13 +2318,13 @@ void qmp_transaction(TransactionActionList *dev_list,
delete_and_fail:
/* failure, and it is all-or-none; roll back all operations */
- QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
+ QTAILQ_FOREACH_REVERSE(state, &snap_bdrv_states, entry) {
if (state->ops->abort) {
state->ops->abort(state);
}
}
exit:
- QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
+ QTAILQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
if (state->ops->clean) {
state->ops->clean(state);
}