From 68dbabe0167538bcf3996692b3dc3dce01e34f74 Mon Sep 17 00:00:00 2001 From: John Snow Date: Thu, 24 Jan 2019 00:55:10 +0100 Subject: [PATCH 5/8] blockdev: abort transactions in reverse order RH-Author: John Snow Message-id: <20190124005511.27662-2-jsnow@redhat.com> Patchwork-id: 84105 O-Subject: [RHEL-7.7 qemu-kvm-rhev PATCH 1/2] blockdev: abort transactions in reverse order Bugzilla: 1658426 RH-Acked-by: Stefan Hajnoczi RH-Acked-by: Max Reitz RH-Acked-by: Eric Blake 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 Reviewed-by: Eric Blake Reviewed-by: Vladimir Sementsov-Ogievskiy Message-Id: <20181221093529.23855-2-jsnow@redhat.com> [eblake: rebase] Signed-off-by: Eric Blake (cherry picked from commit f4de0f8c40b70c4c9308b4670e0a6ad9faed0262) Signed-off-by: John Snow Signed-off-by: Miroslav Rezanina --- blockdev.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/blockdev.c b/blockdev.c index 3eb1880..f25ab15 100644 --- a/blockdev.c +++ b/blockdev.c @@ -1491,7 +1491,7 @@ struct BlkActionState { const BlkActionOps *ops; JobTxn *block_job_txn; TransactionProperties *txn_props; - QSIMPLEQ_ENTRY(BlkActionState) entry; + QTAILQ_ENTRY(BlkActionState) entry; }; /* internal snapshot private data */ @@ -2376,8 +2376,8 @@ void qmp_transaction(TransactionActionList *dev_list, BlkActionState *state, *next; Error *local_err = NULL; - QSIMPLEQ_HEAD(snap_bdrv_states, BlkActionState) snap_bdrv_states; - QSIMPLEQ_INIT(&snap_bdrv_states); + QTAILQ_HEAD(snap_bdrv_states, 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. @@ -2408,7 +2408,7 @@ 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) { @@ -2417,7 +2417,7 @@ 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); } @@ -2428,13 +2428,13 @@ 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, 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); } -- 1.8.3.1