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librbd: update refresh image dispatch layer flush exclusions

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Only flush requests coming from the refresh state machine or from the
exclusive-lock dispatch layer initializationshould be ignored. This is
because both can be initiated from the refresh state machine and
therefore deadlock.

Signed-off-by: Jason Dillaman <dillaman@redhat.com>
This commit is contained in:
Jason Dillaman 2020-09-17 13:05:27 -04:00
parent a320a2b821
commit 2122542a2e
1 changed files with 5 additions and 1 deletions
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6
src/librbd/io/RefreshImageDispatch.cc
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@ -122,7 +122,11 @@ bool RefreshImageDispatch<I>::flush(
auto cct = m_image_ctx->cct;
ldout(cct, 20) << "tid=" << tid << dendl;
if (flush_source != FLUSH_SOURCE_USER) {
// The refresh state machine can initiate a flush and it can
// enable the exclusive-lock which will also attmept to flush.
if (flush_source == FLUSH_SOURCE_REFRESH ||
flush_source == FLUSH_SOURCE_EXCLUSIVE_LOCK_SKIP_REFRESH ||
flush_source == FLUSH_SOURCE_SHUTDOWN) {
return false;
}